drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 /*
  46  * raw track access always map to 64k in memory
  47  * so it maps to 16 blocks of 4k per track
  48  */
  49 #define DASD_RAW_BLOCK_PER_TRACK 16
  50 #define DASD_RAW_BLOCKSIZE 4096
  51 /* 64k are 128 x 512 byte sectors  */
  52 #define DASD_RAW_SECTORS_PER_TRACK 128
  53
  54 MODULE_LICENSE("GPL");
  55
  56 static struct dasd_discipline dasd_eckd_discipline;
  57
  58 /* The ccw bus type uses this table to find devices that it sends to
  59  * dasd_eckd_probe */
  60 static struct ccw_device_id dasd_eckd_ids[] = {
  61         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  62         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  63         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  64         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  65         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  66         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  67         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  68         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  69         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  70         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  71         { /* end of list */ },
  72 };
  73
  74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  75
  76 static struct ccw_driver dasd_eckd_driver; /* see below */
  77
  78 static void *rawpadpage;
  79
  80 #define INIT_CQR_OK 0
  81 #define INIT_CQR_UNFORMATTED 1
  82 #define INIT_CQR_ERROR 2
  83
  84 /* emergency request for reserve/release */
  85 static struct {
  86         struct dasd_ccw_req cqr;
  87         struct ccw1 ccw;
  88         char data[32];
  89 } *dasd_reserve_req;
  90 static DEFINE_MUTEX(dasd_reserve_mutex);
  91
  92 static struct {
  93         struct dasd_ccw_req cqr;
  94         struct ccw1 ccw[2];
  95         char data[40];
  96 } *dasd_vol_info_req;
  97 static DEFINE_MUTEX(dasd_vol_info_mutex);
  98
  99 struct ext_pool_exhaust_work_data {
 100         struct work_struct worker;
 101         struct dasd_device *device;
 102         struct dasd_device *base;
 103 };
 104
 105 /* definitions for the path verification worker */
 106 struct pe_handler_work_data {
 107         struct work_struct worker;
 108         struct dasd_device *device;
 109         struct dasd_ccw_req cqr;
 110         struct ccw1 ccw;
 111         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 112         int isglobal;
 113         __u8 tbvpm;
 114         __u8 fcsecpm;
 115 };
 116 static struct pe_handler_work_data *pe_handler_worker;
 117 static DEFINE_MUTEX(dasd_pe_handler_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int dasd_eckd_ext_pool_id(struct dasd_device *);
 126 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 127                         struct dasd_device *, struct dasd_device *,
 128                         unsigned int, int, unsigned int, unsigned int,
 129                         unsigned int, unsigned int);
 130
 131 /* initial attempt at a probe function. this can be simplified once
 132  * the other detection code is gone */
 133 static int
 134 dasd_eckd_probe (struct ccw_device *cdev)
 135 {
 136         int ret;
 137
 138         /* set ECKD specific ccw-device options */
 139         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 140                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 141         if (ret) {
 142                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 143                                 "dasd_eckd_probe: could not set "
 144                                 "ccw-device options");
 145                 return ret;
 146         }
 147         ret = dasd_generic_probe(cdev);
 148         return ret;
 149 }
 150
 151 static int
 152 dasd_eckd_set_online(struct ccw_device *cdev)
 153 {
 154         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 155 }
 156
 157 static const int sizes_trk0[] = { 28, 148, 84 };
 158 #define LABEL_SIZE 140
 159
 160 /* head and record addresses of count_area read in analysis ccw */
 161 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
 162 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 163
 164 static inline unsigned int
 165 ceil_quot(unsigned int d1, unsigned int d2)
 166 {
 167         return (d1 + (d2 - 1)) / d2;
 168 }
 169
 170 static unsigned int
 171 recs_per_track(struct dasd_eckd_characteristics * rdc,
 172                unsigned int kl, unsigned int dl)
 173 {
 174         int dn, kn;
 175
 176         switch (rdc->dev_type) {
 177         case 0x3380:
 178                 if (kl)
 179                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 180                                        ceil_quot(dl + 12, 32));
 181                 else
 182                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 183         case 0x3390:
 184                 dn = ceil_quot(dl + 6, 232) + 1;
 185                 if (kl) {
 186                         kn = ceil_quot(kl + 6, 232) + 1;
 187                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 188                                        9 + ceil_quot(dl + 6 * dn, 34));
 189                 } else
 190                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 191         case 0x9345:
 192                 dn = ceil_quot(dl + 6, 232) + 1;
 193                 if (kl) {
 194                         kn = ceil_quot(kl + 6, 232) + 1;
 195                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 196                                        ceil_quot(dl + 6 * dn, 34));
 197                 } else
 198                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 199         }
 200         return 0;
 201 }
 202
 203 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 204 {
 205         geo->cyl = (__u16) cyl;
 206         geo->head = cyl >> 16;
 207         geo->head <<= 4;
 208         geo->head |= head;
 209 }
 210
 211 /*
 212  * calculate failing track from sense data depending if
 213  * it is an EAV device or not
 214  */
 215 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
 216                                     sector_t *track)
 217 {
 218         struct dasd_eckd_private *private = device->private;
 219         u8 *sense = NULL;
 220         u32 cyl;
 221         u8 head;
 222
 223         sense = dasd_get_sense(irb);
 224         if (!sense) {
 225                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 226                               "ESE error no sense data\n");
 227                 return -EINVAL;
 228         }
 229         if (!(sense[27] & DASD_SENSE_BIT_2)) {
 230                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 231                               "ESE error no valid track data\n");
 232                 return -EINVAL;
 233         }
 234
 235         if (sense[27] & DASD_SENSE_BIT_3) {
 236                 /* enhanced addressing */
 237                 cyl = sense[30] << 20;
 238                 cyl |= (sense[31] & 0xF0) << 12;
 239                 cyl |= sense[28] << 8;
 240                 cyl |= sense[29];
 241         } else {
 242                 cyl = sense[29] << 8;
 243                 cyl |= sense[30];
 244         }
 245         head = sense[31] & 0x0F;
 246         *track = cyl * private->rdc_data.trk_per_cyl + head;
 247         return 0;
 248 }
 249
 250 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 251                      struct dasd_device *device)
 252 {
 253         struct dasd_eckd_private *private = device->private;
 254         int rc;
 255
 256         rc = get_phys_clock(&data->ep_sys_time);
 257         /*
 258          * Ignore return code if XRC is not supported or
 259          * sync clock is switched off
 260          */
 261         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 262             rc == -EOPNOTSUPP || rc == -EACCES)
 263                 return 0;
 264
 265         /* switch on System Time Stamp - needed for XRC Support */
 266         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 267         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 268
 269         if (ccw) {
 270                 ccw->count = sizeof(struct DE_eckd_data);
 271                 ccw->flags |= CCW_FLAG_SLI;
 272         }
 273
 274         return rc;
 275 }
 276
 277 static int
 278 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 279               unsigned int totrk, int cmd, struct dasd_device *device,
 280               int blksize)
 281 {
 282         struct dasd_eckd_private *private = device->private;
 283         u16 heads, beghead, endhead;
 284         u32 begcyl, endcyl;
 285         int rc = 0;
 286
 287         if (ccw) {
 288                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 289                 ccw->flags = 0;
 290                 ccw->count = 16;
 291                 ccw->cda = (__u32)virt_to_phys(data);
 292         }
 293
 294         memset(data, 0, sizeof(struct DE_eckd_data));
 295         switch (cmd) {
 296         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 297         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 298         case DASD_ECKD_CCW_READ:
 299         case DASD_ECKD_CCW_READ_MT:
 300         case DASD_ECKD_CCW_READ_CKD:
 301         case DASD_ECKD_CCW_READ_CKD_MT:
 302         case DASD_ECKD_CCW_READ_KD:
 303         case DASD_ECKD_CCW_READ_KD_MT:
 304                 data->mask.perm = 0x1;
 305                 data->attributes.operation = private->attrib.operation;
 306                 break;
 307         case DASD_ECKD_CCW_READ_COUNT:
 308                 data->mask.perm = 0x1;
 309                 data->attributes.operation = DASD_BYPASS_CACHE;
 310                 break;
 311         case DASD_ECKD_CCW_READ_TRACK:
 312         case DASD_ECKD_CCW_READ_TRACK_DATA:
 313                 data->mask.perm = 0x1;
 314                 data->attributes.operation = private->attrib.operation;
 315                 data->blk_size = 0;
 316                 break;
 317         case DASD_ECKD_CCW_WRITE:
 318         case DASD_ECKD_CCW_WRITE_MT:
 319         case DASD_ECKD_CCW_WRITE_KD:
 320         case DASD_ECKD_CCW_WRITE_KD_MT:
 321                 data->mask.perm = 0x02;
 322                 data->attributes.operation = private->attrib.operation;
 323                 rc = set_timestamp(ccw, data, device);
 324                 break;
 325         case DASD_ECKD_CCW_WRITE_CKD:
 326         case DASD_ECKD_CCW_WRITE_CKD_MT:
 327                 data->attributes.operation = DASD_BYPASS_CACHE;
 328                 rc = set_timestamp(ccw, data, device);
 329                 break;
 330         case DASD_ECKD_CCW_ERASE:
 331         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 332         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 333                 data->mask.perm = 0x3;
 334                 data->mask.auth = 0x1;
 335                 data->attributes.operation = DASD_BYPASS_CACHE;
 336                 rc = set_timestamp(ccw, data, device);
 337                 break;
 338         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 339                 data->mask.perm = 0x03;
 340                 data->attributes.operation = private->attrib.operation;
 341                 data->blk_size = 0;
 342                 break;
 343         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 344                 data->mask.perm = 0x02;
 345                 data->attributes.operation = private->attrib.operation;
 346                 data->blk_size = blksize;
 347                 rc = set_timestamp(ccw, data, device);
 348                 break;
 349         default:
 350                 dev_err(&device->cdev->dev,
 351                         "0x%x is not a known command\n", cmd);
 352                 break;
 353         }
 354
 355         data->attributes.mode = 0x3;    /* ECKD */
 356
 357         if ((private->rdc_data.cu_type == 0x2105 ||
 358              private->rdc_data.cu_type == 0x2107 ||
 359              private->rdc_data.cu_type == 0x1750)
 360             && !(private->uses_cdl && trk < 2))
 361                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 362
 363         heads = private->rdc_data.trk_per_cyl;
 364         begcyl = trk / heads;
 365         beghead = trk % heads;
 366         endcyl = totrk / heads;
 367         endhead = totrk % heads;
 368
 369         /* check for sequential prestage - enhance cylinder range */
 370         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 371             data->attributes.operation == DASD_SEQ_ACCESS) {
 372
 373                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 374                         endcyl += private->attrib.nr_cyl;
 375                 else
 376                         endcyl = (private->real_cyl - 1);
 377         }
 378
 379         set_ch_t(&data->beg_ext, begcyl, beghead);
 380         set_ch_t(&data->end_ext, endcyl, endhead);
 381         return rc;
 382 }
 383
 384
 385 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 386                               unsigned int trk, unsigned int rec_on_trk,
 387                               int count, int cmd, struct dasd_device *device,
 388                               unsigned int reclen, unsigned int tlf)
 389 {
 390         struct dasd_eckd_private *private = device->private;
 391         int sector;
 392         int dn, d;
 393
 394         if (ccw) {
 395                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 396                 ccw->flags = 0;
 397                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 398                         ccw->count = 22;
 399                 else
 400                         ccw->count = 20;
 401                 ccw->cda = (__u32)virt_to_phys(data);
 402         }
 403
 404         memset(data, 0, sizeof(*data));
 405         sector = 0;
 406         if (rec_on_trk) {
 407                 switch (private->rdc_data.dev_type) {
 408                 case 0x3390:
 409                         dn = ceil_quot(reclen + 6, 232);
 410                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 411                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 412                         break;
 413                 case 0x3380:
 414                         d = 7 + ceil_quot(reclen + 12, 32);
 415                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 416                         break;
 417                 }
 418         }
 419         data->sector = sector;
 420         /* note: meaning of count depends on the operation
 421          *       for record based I/O it's the number of records, but for
 422          *       track based I/O it's the number of tracks
 423          */
 424         data->count = count;
 425         switch (cmd) {
 426         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 427                 data->operation.orientation = 0x3;
 428                 data->operation.operation = 0x03;
 429                 break;
 430         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 431                 data->operation.orientation = 0x3;
 432                 data->operation.operation = 0x16;
 433                 break;
 434         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 435                 data->operation.orientation = 0x1;
 436                 data->operation.operation = 0x03;
 437                 data->count++;
 438                 break;
 439         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 440                 data->operation.orientation = 0x3;
 441                 data->operation.operation = 0x16;
 442                 data->count++;
 443                 break;
 444         case DASD_ECKD_CCW_WRITE:
 445         case DASD_ECKD_CCW_WRITE_MT:
 446         case DASD_ECKD_CCW_WRITE_KD:
 447         case DASD_ECKD_CCW_WRITE_KD_MT:
 448                 data->auxiliary.length_valid = 0x1;
 449                 data->length = reclen;
 450                 data->operation.operation = 0x01;
 451                 break;
 452         case DASD_ECKD_CCW_WRITE_CKD:
 453         case DASD_ECKD_CCW_WRITE_CKD_MT:
 454                 data->auxiliary.length_valid = 0x1;
 455                 data->length = reclen;
 456                 data->operation.operation = 0x03;
 457                 break;
 458         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 459                 data->operation.orientation = 0x0;
 460                 data->operation.operation = 0x3F;
 461                 data->extended_operation = 0x11;
 462                 data->length = 0;
 463                 data->extended_parameter_length = 0x02;
 464                 if (data->count > 8) {
 465                         data->extended_parameter[0] = 0xFF;
 466                         data->extended_parameter[1] = 0xFF;
 467                         data->extended_parameter[1] <<= (16 - count);
 468                 } else {
 469                         data->extended_parameter[0] = 0xFF;
 470                         data->extended_parameter[0] <<= (8 - count);
 471                         data->extended_parameter[1] = 0x00;
 472                 }
 473                 data->sector = 0xFF;
 474                 break;
 475         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 476                 data->auxiliary.length_valid = 0x1;
 477                 data->length = reclen;  /* not tlf, as one might think */
 478                 data->operation.operation = 0x3F;
 479                 data->extended_operation = 0x23;
 480                 break;
 481         case DASD_ECKD_CCW_READ:
 482         case DASD_ECKD_CCW_READ_MT:
 483         case DASD_ECKD_CCW_READ_KD:
 484         case DASD_ECKD_CCW_READ_KD_MT:
 485                 data->auxiliary.length_valid = 0x1;
 486                 data->length = reclen;
 487                 data->operation.operation = 0x06;
 488                 break;
 489         case DASD_ECKD_CCW_READ_CKD:
 490         case DASD_ECKD_CCW_READ_CKD_MT:
 491                 data->auxiliary.length_valid = 0x1;
 492                 data->length = reclen;
 493                 data->operation.operation = 0x16;
 494                 break;
 495         case DASD_ECKD_CCW_READ_COUNT:
 496                 data->operation.operation = 0x06;
 497                 break;
 498         case DASD_ECKD_CCW_READ_TRACK:
 499                 data->operation.orientation = 0x1;
 500                 data->operation.operation = 0x0C;
 501                 data->extended_parameter_length = 0;
 502                 data->sector = 0xFF;
 503                 break;
 504         case DASD_ECKD_CCW_READ_TRACK_DATA:
 505                 data->auxiliary.length_valid = 0x1;
 506                 data->length = tlf;
 507                 data->operation.operation = 0x0C;
 508                 break;
 509         case DASD_ECKD_CCW_ERASE:
 510                 data->length = reclen;
 511                 data->auxiliary.length_valid = 0x1;
 512                 data->operation.operation = 0x0b;
 513                 break;
 514         default:
 515                 DBF_DEV_EVENT(DBF_ERR, device,
 516                             "fill LRE unknown opcode 0x%x", cmd);
 517                 BUG();
 518         }
 519         set_ch_t(&data->seek_addr,
 520                  trk / private->rdc_data.trk_per_cyl,
 521                  trk % private->rdc_data.trk_per_cyl);
 522         data->search_arg.cyl = data->seek_addr.cyl;
 523         data->search_arg.head = data->seek_addr.head;
 524         data->search_arg.record = rec_on_trk;
 525 }
 526
 527 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 528                       unsigned int trk, unsigned int totrk, int cmd,
 529                       struct dasd_device *basedev, struct dasd_device *startdev,
 530                       unsigned int format, unsigned int rec_on_trk, int count,
 531                       unsigned int blksize, unsigned int tlf)
 532 {
 533         struct dasd_eckd_private *basepriv, *startpriv;
 534         struct LRE_eckd_data *lredata;
 535         struct DE_eckd_data *dedata;
 536         int rc = 0;
 537
 538         basepriv = basedev->private;
 539         startpriv = startdev->private;
 540         dedata = &pfxdata->define_extent;
 541         lredata = &pfxdata->locate_record;
 542
 543         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 544         ccw->flags = 0;
 545         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 546                 ccw->count = sizeof(*pfxdata) + 2;
 547                 ccw->cda = (__u32)virt_to_phys(pfxdata);
 548                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 549         } else {
 550                 ccw->count = sizeof(*pfxdata);
 551                 ccw->cda = (__u32)virt_to_phys(pfxdata);
 552                 memset(pfxdata, 0, sizeof(*pfxdata));
 553         }
 554
 555         /* prefix data */
 556         if (format > 1) {
 557                 DBF_DEV_EVENT(DBF_ERR, basedev,
 558                               "PFX LRE unknown format 0x%x", format);
 559                 BUG();
 560                 return -EINVAL;
 561         }
 562         pfxdata->format = format;
 563         pfxdata->base_address = basepriv->conf.ned->unit_addr;
 564         pfxdata->base_lss = basepriv->conf.ned->ID;
 565         pfxdata->validity.define_extent = 1;
 566
 567         /* private uid is kept up to date, conf_data may be outdated */
 568         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 569                 pfxdata->validity.verify_base = 1;
 570
 571         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 572                 pfxdata->validity.verify_base = 1;
 573                 pfxdata->validity.hyper_pav = 1;
 574         }
 575
 576         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 577
 578         /*
 579          * For some commands the System Time Stamp is set in the define extent
 580          * data when XRC is supported. The validity of the time stamp must be
 581          * reflected in the prefix data as well.
 582          */
 583         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 584                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 585
 586         if (format == 1) {
 587                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 588                                   basedev, blksize, tlf);
 589         }
 590
 591         return rc;
 592 }
 593
 594 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 595                   unsigned int trk, unsigned int totrk, int cmd,
 596                   struct dasd_device *basedev, struct dasd_device *startdev)
 597 {
 598         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 599                           0, 0, 0, 0, 0);
 600 }
 601
 602 static void
 603 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 604               unsigned int rec_on_trk, int no_rec, int cmd,
 605               struct dasd_device * device, int reclen)
 606 {
 607         struct dasd_eckd_private *private = device->private;
 608         int sector;
 609         int dn, d;
 610
 611         DBF_DEV_EVENT(DBF_INFO, device,
 612                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 613                   trk, rec_on_trk, no_rec, cmd, reclen);
 614
 615         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 616         ccw->flags = 0;
 617         ccw->count = 16;
 618         ccw->cda = (__u32)virt_to_phys(data);
 619
 620         memset(data, 0, sizeof(struct LO_eckd_data));
 621         sector = 0;
 622         if (rec_on_trk) {
 623                 switch (private->rdc_data.dev_type) {
 624                 case 0x3390:
 625                         dn = ceil_quot(reclen + 6, 232);
 626                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 627                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 628                         break;
 629                 case 0x3380:
 630                         d = 7 + ceil_quot(reclen + 12, 32);
 631                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 632                         break;
 633                 }
 634         }
 635         data->sector = sector;
 636         data->count = no_rec;
 637         switch (cmd) {
 638         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 639                 data->operation.orientation = 0x3;
 640                 data->operation.operation = 0x03;
 641                 break;
 642         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 643                 data->operation.orientation = 0x3;
 644                 data->operation.operation = 0x16;
 645                 break;
 646         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 647                 data->operation.orientation = 0x1;
 648                 data->operation.operation = 0x03;
 649                 data->count++;
 650                 break;
 651         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 652                 data->operation.orientation = 0x3;
 653                 data->operation.operation = 0x16;
 654                 data->count++;
 655                 break;
 656         case DASD_ECKD_CCW_WRITE:
 657         case DASD_ECKD_CCW_WRITE_MT:
 658         case DASD_ECKD_CCW_WRITE_KD:
 659         case DASD_ECKD_CCW_WRITE_KD_MT:
 660                 data->auxiliary.last_bytes_used = 0x1;
 661                 data->length = reclen;
 662                 data->operation.operation = 0x01;
 663                 break;
 664         case DASD_ECKD_CCW_WRITE_CKD:
 665         case DASD_ECKD_CCW_WRITE_CKD_MT:
 666                 data->auxiliary.last_bytes_used = 0x1;
 667                 data->length = reclen;
 668                 data->operation.operation = 0x03;
 669                 break;
 670         case DASD_ECKD_CCW_READ:
 671         case DASD_ECKD_CCW_READ_MT:
 672         case DASD_ECKD_CCW_READ_KD:
 673         case DASD_ECKD_CCW_READ_KD_MT:
 674                 data->auxiliary.last_bytes_used = 0x1;
 675                 data->length = reclen;
 676                 data->operation.operation = 0x06;
 677                 break;
 678         case DASD_ECKD_CCW_READ_CKD:
 679         case DASD_ECKD_CCW_READ_CKD_MT:
 680                 data->auxiliary.last_bytes_used = 0x1;
 681                 data->length = reclen;
 682                 data->operation.operation = 0x16;
 683                 break;
 684         case DASD_ECKD_CCW_READ_COUNT:
 685                 data->operation.operation = 0x06;
 686                 break;
 687         case DASD_ECKD_CCW_ERASE:
 688                 data->length = reclen;
 689                 data->auxiliary.last_bytes_used = 0x1;
 690                 data->operation.operation = 0x0b;
 691                 break;
 692         default:
 693                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 694                               "opcode 0x%x", cmd);
 695         }
 696         set_ch_t(&data->seek_addr,
 697                  trk / private->rdc_data.trk_per_cyl,
 698                  trk % private->rdc_data.trk_per_cyl);
 699         data->search_arg.cyl = data->seek_addr.cyl;
 700         data->search_arg.head = data->seek_addr.head;
 701         data->search_arg.record = rec_on_trk;
 702 }
 703
 704 /*
 705  * Returns 1 if the block is one of the special blocks that needs
 706  * to get read/written with the KD variant of the command.
 707  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 708  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 709  * Luckily the KD variants differ only by one bit (0x08) from the
 710  * normal variant. So don't wonder about code like:
 711  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 712  *         ccw->cmd_code |= 0x8;
 713  */
 714 static inline int
 715 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 716 {
 717         if (recid < 3)
 718                 return 1;
 719         if (recid < blk_per_trk)
 720                 return 0;
 721         if (recid < 2 * blk_per_trk)
 722                 return 1;
 723         return 0;
 724 }
 725
 726 /*
 727  * Returns the record size for the special blocks of the cdl format.
 728  * Only returns something useful if dasd_eckd_cdl_special is true
 729  * for the recid.
 730  */
 731 static inline int
 732 dasd_eckd_cdl_reclen(int recid)
 733 {
 734         if (recid < 3)
 735                 return sizes_trk0[recid];
 736         return LABEL_SIZE;
 737 }
 738 /* create unique id from private structure. */
 739 static void create_uid(struct dasd_conf *conf, struct dasd_uid *uid)
 740 {
 741         int count;
 742
 743         memset(uid, 0, sizeof(struct dasd_uid));
 744         memcpy(uid->vendor, conf->ned->HDA_manufacturer,
 745                sizeof(uid->vendor) - 1);
 746         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 747         memcpy(uid->serial, &conf->ned->serial,
 748                sizeof(uid->serial) - 1);
 749         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 750         uid->ssid = conf->gneq->subsystemID;
 751         uid->real_unit_addr = conf->ned->unit_addr;
 752         if (conf->sneq) {
 753                 uid->type = conf->sneq->sua_flags;
 754                 if (uid->type == UA_BASE_PAV_ALIAS)
 755                         uid->base_unit_addr = conf->sneq->base_unit_addr;
 756         } else {
 757                 uid->type = UA_BASE_DEVICE;
 758         }
 759         if (conf->vdsneq) {
 760                 for (count = 0; count < 16; count++) {
 761                         sprintf(uid->vduit+2*count, "%02x",
 762                                 conf->vdsneq->uit[count]);
 763                 }
 764         }
 765 }
 766
 767 /*
 768  * Generate device unique id that specifies the physical device.
 769  */
 770 static int dasd_eckd_generate_uid(struct dasd_device *device)
 771 {
 772         struct dasd_eckd_private *private = device->private;
 773         unsigned long flags;
 774
 775         if (!private)
 776                 return -ENODEV;
 777         if (!private->conf.ned || !private->conf.gneq)
 778                 return -ENODEV;
 779         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 780         create_uid(&private->conf, &private->uid);
 781         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 782         return 0;
 783 }
 784
 785 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 786 {
 787         struct dasd_eckd_private *private = device->private;
 788         unsigned long flags;
 789
 790         if (private) {
 791                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 792                 *uid = private->uid;
 793                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 794                 return 0;
 795         }
 796         return -EINVAL;
 797 }
 798
 799 /*
 800  * compare device UID with data of a given dasd_eckd_private structure
 801  * return 0 for match
 802  */
 803 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 804                                       struct dasd_conf *path_conf)
 805 {
 806         struct dasd_uid device_uid;
 807         struct dasd_uid path_uid;
 808
 809         create_uid(path_conf, &path_uid);
 810         dasd_eckd_get_uid(device, &device_uid);
 811
 812         return memcmp(&device_uid, &path_uid, sizeof(struct dasd_uid));
 813 }
 814
 815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 816                                    struct dasd_ccw_req *cqr,
 817                                    __u8 *rcd_buffer,
 818                                    __u8 lpm)
 819 {
 820         struct ccw1 *ccw;
 821         /*
 822          * buffer has to start with EBCDIC "V1.0" to show
 823          * support for virtual device SNEQ
 824          */
 825         rcd_buffer[0] = 0xE5;
 826         rcd_buffer[1] = 0xF1;
 827         rcd_buffer[2] = 0x4B;
 828         rcd_buffer[3] = 0xF0;
 829
 830         ccw = cqr->cpaddr;
 831         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 832         ccw->flags = 0;
 833         ccw->cda = (__u32)virt_to_phys(rcd_buffer);
 834         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 835         cqr->magic = DASD_ECKD_MAGIC;
 836
 837         cqr->startdev = device;
 838         cqr->memdev = device;
 839         cqr->block = NULL;
 840         cqr->expires = 10*HZ;
 841         cqr->lpm = lpm;
 842         cqr->retries = 256;
 843         cqr->buildclk = get_tod_clock();
 844         cqr->status = DASD_CQR_FILLED;
 845         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 846 }
 847
 848 /*
 849  * Wakeup helper for read_conf
 850  * if the cqr is not done and needs some error recovery
 851  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 852  * to show support for virtual device SNEQ
 853  */
 854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 855 {
 856         struct ccw1 *ccw;
 857         __u8 *rcd_buffer;
 858
 859         if (cqr->status !=  DASD_CQR_DONE) {
 860                 ccw = cqr->cpaddr;
 861                 rcd_buffer = phys_to_virt(ccw->cda);
 862                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 863
 864                 rcd_buffer[0] = 0xE5;
 865                 rcd_buffer[1] = 0xF1;
 866                 rcd_buffer[2] = 0x4B;
 867                 rcd_buffer[3] = 0xF0;
 868         }
 869         dasd_wakeup_cb(cqr, data);
 870 }
 871
 872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 873                                            struct dasd_ccw_req *cqr,
 874                                            __u8 *rcd_buffer,
 875                                            __u8 lpm)
 876 {
 877         struct ciw *ciw;
 878         int rc;
 879         /*
 880          * sanity check: scan for RCD command in extended SenseID data
 881          * some devices do not support RCD
 882          */
 883         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 884         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 885                 return -EOPNOTSUPP;
 886
 887         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 888         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 889         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 890         cqr->retries = 5;
 891         cqr->callback = read_conf_cb;
 892         rc = dasd_sleep_on_immediatly(cqr);
 893         return rc;
 894 }
 895
 896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 897                                    void **rcd_buffer,
 898                                    int *rcd_buffer_size, __u8 lpm)
 899 {
 900         struct ciw *ciw;
 901         char *rcd_buf = NULL;
 902         int ret;
 903         struct dasd_ccw_req *cqr;
 904
 905         /*
 906          * sanity check: scan for RCD command in extended SenseID data
 907          * some devices do not support RCD
 908          */
 909         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 910         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 911                 ret = -EOPNOTSUPP;
 912                 goto out_error;
 913         }
 914         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 915         if (!rcd_buf) {
 916                 ret = -ENOMEM;
 917                 goto out_error;
 918         }
 919         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 920                                    0, /* use rcd_buf as data ara */
 921                                    device, NULL);
 922         if (IS_ERR(cqr)) {
 923                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 924                               "Could not allocate RCD request");
 925                 ret = -ENOMEM;
 926                 goto out_error;
 927         }
 928         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 929         cqr->callback = read_conf_cb;
 930         ret = dasd_sleep_on(cqr);
 931         /*
 932          * on success we update the user input parms
 933          */
 934         dasd_sfree_request(cqr, cqr->memdev);
 935         if (ret)
 936                 goto out_error;
 937
 938         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 939         *rcd_buffer = rcd_buf;
 940         return 0;
 941 out_error:
 942         kfree(rcd_buf);
 943         *rcd_buffer = NULL;
 944         *rcd_buffer_size = 0;
 945         return ret;
 946 }
 947
 948 static int dasd_eckd_identify_conf_parts(struct dasd_conf *conf)
 949 {
 950
 951         struct dasd_sneq *sneq;
 952         int i, count;
 953
 954         conf->ned = NULL;
 955         conf->sneq = NULL;
 956         conf->vdsneq = NULL;
 957         conf->gneq = NULL;
 958         count = conf->len / sizeof(struct dasd_sneq);
 959         sneq = (struct dasd_sneq *)conf->data;
 960         for (i = 0; i < count; ++i) {
 961                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 962                         conf->sneq = sneq;
 963                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 964                         conf->vdsneq = (struct vd_sneq *)sneq;
 965                 else if (sneq->flags.identifier == 2)
 966                         conf->gneq = (struct dasd_gneq *)sneq;
 967                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 968                         conf->ned = (struct dasd_ned *)sneq;
 969                 sneq++;
 970         }
 971         if (!conf->ned || !conf->gneq) {
 972                 conf->ned = NULL;
 973                 conf->sneq = NULL;
 974                 conf->vdsneq = NULL;
 975                 conf->gneq = NULL;
 976                 return -EINVAL;
 977         }
 978         return 0;
 979
 980 };
 981
 982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 983 {
 984         struct dasd_gneq *gneq;
 985         int i, count, found;
 986
 987         count = conf_len / sizeof(*gneq);
 988         gneq = (struct dasd_gneq *)conf_data;
 989         found = 0;
 990         for (i = 0; i < count; ++i) {
 991                 if (gneq->flags.identifier == 2) {
 992                         found = 1;
 993                         break;
 994                 }
 995                 gneq++;
 996         }
 997         if (found)
 998                 return ((char *)gneq)[18] & 0x07;
 999         else
1000                 return 0;
1001 }
1002
1003 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1004                                       struct dasd_conf_data *conf_data, int chp)
1005 {
1006         struct dasd_eckd_private *private = device->private;
1007         struct channel_path_desc_fmt0 *chp_desc;
1008         struct subchannel_id sch_id;
1009         void *cdp;
1010
1011         /*
1012          * path handling and read_conf allocate data
1013          * free it before replacing the pointer
1014          * also replace the old private->conf_data pointer
1015          * with the new one if this points to the same data
1016          */
1017         cdp = device->path[chp].conf_data;
1018         if (private->conf.data == cdp) {
1019                 private->conf.data = (void *)conf_data;
1020                 dasd_eckd_identify_conf_parts(&private->conf);
1021         }
1022         ccw_device_get_schid(device->cdev, &sch_id);
1023         device->path[chp].conf_data = conf_data;
1024         device->path[chp].cssid = sch_id.cssid;
1025         device->path[chp].ssid = sch_id.ssid;
1026         chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1027         if (chp_desc)
1028                 device->path[chp].chpid = chp_desc->chpid;
1029         kfree(chp_desc);
1030         kfree(cdp);
1031 }
1032
1033 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1034 {
1035         struct dasd_eckd_private *private = device->private;
1036         int i;
1037
1038         private->conf.data = NULL;
1039         private->conf.len = 0;
1040         for (i = 0; i < 8; i++) {
1041                 kfree(device->path[i].conf_data);
1042                 device->path[i].conf_data = NULL;
1043                 device->path[i].cssid = 0;
1044                 device->path[i].ssid = 0;
1045                 device->path[i].chpid = 0;
1046                 dasd_path_notoper(device, i);
1047         }
1048 }
1049
1050 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1051 {
1052         struct dasd_eckd_private *private = device->private;
1053         u8 esm_valid;
1054         u8 esm[8];
1055         int chp;
1056         int rc;
1057
1058         rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1059         if (rc) {
1060                 for (chp = 0; chp < 8; chp++)
1061                         device->path[chp].fc_security = 0;
1062                 return;
1063         }
1064
1065         for (chp = 0; chp < 8; chp++) {
1066                 if (esm_valid & (0x80 >> chp))
1067                         device->path[chp].fc_security = esm[chp];
1068                 else
1069                         device->path[chp].fc_security = 0;
1070         }
1071 }
1072
1073 static void dasd_eckd_get_uid_string(struct dasd_conf *conf,
1074                                      char *print_uid)
1075 {
1076         struct dasd_uid uid;
1077
1078         create_uid(conf, &uid);
1079         if (strlen(uid.vduit) > 0)
1080                 snprintf(print_uid, sizeof(*print_uid),
1081                          "%s.%s.%04x.%02x.%s",
1082                          uid.vendor, uid.serial, uid.ssid,
1083                          uid.real_unit_addr, uid.vduit);
1084         else
1085                 snprintf(print_uid, sizeof(*print_uid),
1086                          "%s.%s.%04x.%02x",
1087                          uid.vendor, uid.serial, uid.ssid,
1088                          uid.real_unit_addr);
1089 }
1090
1091 static int dasd_eckd_check_cabling(struct dasd_device *device,
1092                                    void *conf_data, __u8 lpm)
1093 {
1094         struct dasd_eckd_private *private = device->private;
1095         char print_path_uid[60], print_device_uid[60];
1096         struct dasd_conf path_conf;
1097
1098         path_conf.data = conf_data;
1099         path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1100         if (dasd_eckd_identify_conf_parts(&path_conf))
1101                 return 1;
1102
1103         if (dasd_eckd_compare_path_uid(device, &path_conf)) {
1104                 dasd_eckd_get_uid_string(&path_conf, print_path_uid);
1105                 dasd_eckd_get_uid_string(&private->conf, print_device_uid);
1106                 dev_err(&device->cdev->dev,
1107                         "Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
1108                         lpm, print_path_uid, print_device_uid);
1109                 return 1;
1110         }
1111
1112         return 0;
1113 }
1114
1115 static int dasd_eckd_read_conf(struct dasd_device *device)
1116 {
1117         void *conf_data;
1118         int conf_len, conf_data_saved;
1119         int rc, path_err, pos;
1120         __u8 lpm, opm;
1121         struct dasd_eckd_private *private;
1122
1123         private = device->private;
1124         opm = ccw_device_get_path_mask(device->cdev);
1125         conf_data_saved = 0;
1126         path_err = 0;
1127         /* get configuration data per operational path */
1128         for (lpm = 0x80; lpm; lpm>>= 1) {
1129                 if (!(lpm & opm))
1130                         continue;
1131                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1132                                              &conf_len, lpm);
1133                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1134                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1135                                         "Read configuration data returned "
1136                                         "error %d", rc);
1137                         return rc;
1138                 }
1139                 if (conf_data == NULL) {
1140                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1141                                         "No configuration data "
1142                                         "retrieved");
1143                         /* no further analysis possible */
1144                         dasd_path_add_opm(device, opm);
1145                         continue;       /* no error */
1146                 }
1147                 /* save first valid configuration data */
1148                 if (!conf_data_saved) {
1149                         /* initially clear previously stored conf_data */
1150                         dasd_eckd_clear_conf_data(device);
1151                         private->conf.data = conf_data;
1152                         private->conf.len = conf_len;
1153                         if (dasd_eckd_identify_conf_parts(&private->conf)) {
1154                                 private->conf.data = NULL;
1155                                 private->conf.len = 0;
1156                                 kfree(conf_data);
1157                                 continue;
1158                         }
1159                         /*
1160                          * build device UID that other path data
1161                          * can be compared to it
1162                          */
1163                         dasd_eckd_generate_uid(device);
1164                         conf_data_saved++;
1165                 } else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
1166                         dasd_path_add_cablepm(device, lpm);
1167                         path_err = -EINVAL;
1168                         kfree(conf_data);
1169                         continue;
1170                 }
1171
1172                 pos = pathmask_to_pos(lpm);
1173                 dasd_eckd_store_conf_data(device, conf_data, pos);
1174
1175                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1176                 case 0x02:
1177                         dasd_path_add_nppm(device, lpm);
1178                         break;
1179                 case 0x03:
1180                         dasd_path_add_ppm(device, lpm);
1181                         break;
1182                 }
1183                 if (!dasd_path_get_opm(device)) {
1184                         dasd_path_set_opm(device, lpm);
1185                         dasd_generic_path_operational(device);
1186                 } else {
1187                         dasd_path_add_opm(device, lpm);
1188                 }
1189         }
1190
1191         return path_err;
1192 }
1193
1194 static u32 get_fcx_max_data(struct dasd_device *device)
1195 {
1196         struct dasd_eckd_private *private = device->private;
1197         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1198         unsigned int mdc;
1199         int tpm;
1200
1201         if (dasd_nofcx)
1202                 return 0;
1203         /* is transport mode supported? */
1204         fcx_in_css = css_general_characteristics.fcx;
1205         fcx_in_gneq = private->conf.gneq->reserved2[7] & 0x04;
1206         fcx_in_features = private->features.feature[40] & 0x80;
1207         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1208
1209         if (!tpm)
1210                 return 0;
1211
1212         mdc = ccw_device_get_mdc(device->cdev, 0);
1213         if (mdc == 0) {
1214                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1215                 return 0;
1216         } else {
1217                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1218         }
1219 }
1220
1221 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1222 {
1223         struct dasd_eckd_private *private = device->private;
1224         unsigned int mdc;
1225         u32 fcx_max_data;
1226
1227         if (private->fcx_max_data) {
1228                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1229                 if (mdc == 0) {
1230                         dev_warn(&device->cdev->dev,
1231                                  "Detecting the maximum data size for zHPF "
1232                                  "requests failed (rc=%d) for a new path %x\n",
1233                                  mdc, lpm);
1234                         return mdc;
1235                 }
1236                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1237                 if (fcx_max_data < private->fcx_max_data) {
1238                         dev_warn(&device->cdev->dev,
1239                                  "The maximum data size for zHPF requests %u "
1240                                  "on a new path %x is below the active maximum "
1241                                  "%u\n", fcx_max_data, lpm,
1242                                  private->fcx_max_data);
1243                         return -EACCES;
1244                 }
1245         }
1246         return 0;
1247 }
1248
1249 static int rebuild_device_uid(struct dasd_device *device,
1250                               struct pe_handler_work_data *data)
1251 {
1252         struct dasd_eckd_private *private = device->private;
1253         __u8 lpm, opm = dasd_path_get_opm(device);
1254         int rc = -ENODEV;
1255
1256         for (lpm = 0x80; lpm; lpm >>= 1) {
1257                 if (!(lpm & opm))
1258                         continue;
1259                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1260                 memset(&data->cqr, 0, sizeof(data->cqr));
1261                 data->cqr.cpaddr = &data->ccw;
1262                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1263                                                      data->rcd_buffer,
1264                                                      lpm);
1265
1266                 if (rc) {
1267                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1268                                 continue;
1269                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1270                                         "Read configuration data "
1271                                         "returned error %d", rc);
1272                         break;
1273                 }
1274                 memcpy(private->conf.data, data->rcd_buffer,
1275                        DASD_ECKD_RCD_DATA_SIZE);
1276                 if (dasd_eckd_identify_conf_parts(&private->conf)) {
1277                         rc = -ENODEV;
1278                 } else /* first valid path is enough */
1279                         break;
1280         }
1281
1282         if (!rc)
1283                 rc = dasd_eckd_generate_uid(device);
1284
1285         return rc;
1286 }
1287
1288 static void dasd_eckd_path_available_action(struct dasd_device *device,
1289                                             struct pe_handler_work_data *data)
1290 {
1291         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1292         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1293         struct dasd_conf_data *conf_data;
1294         struct dasd_conf path_conf;
1295         unsigned long flags;
1296         char print_uid[60];
1297         int rc, pos;
1298
1299         opm = 0;
1300         npm = 0;
1301         ppm = 0;
1302         epm = 0;
1303         hpfpm = 0;
1304         cablepm = 0;
1305
1306         for (lpm = 0x80; lpm; lpm >>= 1) {
1307                 if (!(lpm & data->tbvpm))
1308                         continue;
1309                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1310                 memset(&data->cqr, 0, sizeof(data->cqr));
1311                 data->cqr.cpaddr = &data->ccw;
1312                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1313                                                      data->rcd_buffer,
1314                                                      lpm);
1315                 if (!rc) {
1316                         switch (dasd_eckd_path_access(data->rcd_buffer,
1317                                                       DASD_ECKD_RCD_DATA_SIZE)
1318                                 ) {
1319                         case 0x02:
1320                                 npm |= lpm;
1321                                 break;
1322                         case 0x03:
1323                                 ppm |= lpm;
1324                                 break;
1325                         }
1326                         opm |= lpm;
1327                 } else if (rc == -EOPNOTSUPP) {
1328                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1329                                         "path verification: No configuration "
1330                                         "data retrieved");
1331                         opm |= lpm;
1332                 } else if (rc == -EAGAIN) {
1333                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1334                                         "path verification: device is stopped,"
1335                                         " try again later");
1336                         epm |= lpm;
1337                 } else {
1338                         dev_warn(&device->cdev->dev,
1339                                  "Reading device feature codes failed "
1340                                  "(rc=%d) for new path %x\n", rc, lpm);
1341                         continue;
1342                 }
1343                 if (verify_fcx_max_data(device, lpm)) {
1344                         opm &= ~lpm;
1345                         npm &= ~lpm;
1346                         ppm &= ~lpm;
1347                         hpfpm |= lpm;
1348                         continue;
1349                 }
1350
1351                 /*
1352                  * save conf_data for comparison after
1353                  * rebuild_device_uid may have changed
1354                  * the original data
1355                  */
1356                 memcpy(&path_rcd_buf, data->rcd_buffer,
1357                        DASD_ECKD_RCD_DATA_SIZE);
1358                 path_conf.data = (void *)&path_rcd_buf;
1359                 path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1360                 if (dasd_eckd_identify_conf_parts(&path_conf)) {
1361                         path_conf.data = NULL;
1362                         path_conf.len = 0;
1363                         continue;
1364                 }
1365
1366                 /*
1367                  * compare path UID with device UID only if at least
1368                  * one valid path is left
1369                  * in other case the device UID may have changed and
1370                  * the first working path UID will be used as device UID
1371                  */
1372                 if (dasd_path_get_opm(device) &&
1373                     dasd_eckd_compare_path_uid(device, &path_conf)) {
1374                         /*
1375                          * the comparison was not successful
1376                          * rebuild the device UID with at least one
1377                          * known path in case a z/VM hyperswap command
1378                          * has changed the device
1379                          *
1380                          * after this compare again
1381                          *
1382                          * if either the rebuild or the recompare fails
1383                          * the path can not be used
1384                          */
1385                         if (rebuild_device_uid(device, data) ||
1386                             dasd_eckd_compare_path_uid(
1387                                     device, &path_conf)) {
1388                                 dasd_eckd_get_uid_string(&path_conf, print_uid);
1389                                 dev_err(&device->cdev->dev,
1390                                         "The newly added channel path %02X "
1391                                         "will not be used because it leads "
1392                                         "to a different device %s\n",
1393                                         lpm, print_uid);
1394                                 opm &= ~lpm;
1395                                 npm &= ~lpm;
1396                                 ppm &= ~lpm;
1397                                 cablepm |= lpm;
1398                                 continue;
1399                         }
1400                 }
1401
1402                 conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1403                 if (conf_data) {
1404                         memcpy(conf_data, data->rcd_buffer,
1405                                DASD_ECKD_RCD_DATA_SIZE);
1406                 } else {
1407                         /*
1408                          * path is operational but path config data could not
1409                          * be stored due to low mem condition
1410                          * add it to the error path mask and schedule a path
1411                          * verification later that this could be added again
1412                          */
1413                         epm |= lpm;
1414                 }
1415                 pos = pathmask_to_pos(lpm);
1416                 dasd_eckd_store_conf_data(device, conf_data, pos);
1417
1418                 /*
1419                  * There is a small chance that a path is lost again between
1420                  * above path verification and the following modification of
1421                  * the device opm mask. We could avoid that race here by using
1422                  * yet another path mask, but we rather deal with this unlikely
1423                  * situation in dasd_start_IO.
1424                  */
1425                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1426                 if (!dasd_path_get_opm(device) && opm) {
1427                         dasd_path_set_opm(device, opm);
1428                         dasd_generic_path_operational(device);
1429                 } else {
1430                         dasd_path_add_opm(device, opm);
1431                 }
1432                 dasd_path_add_nppm(device, npm);
1433                 dasd_path_add_ppm(device, ppm);
1434                 if (epm) {
1435                         dasd_path_add_tbvpm(device, epm);
1436                         dasd_device_set_timer(device, 50);
1437                 }
1438                 dasd_path_add_cablepm(device, cablepm);
1439                 dasd_path_add_nohpfpm(device, hpfpm);
1440                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1441
1442                 dasd_path_create_kobj(device, pos);
1443         }
1444 }
1445
1446 static void do_pe_handler_work(struct work_struct *work)
1447 {
1448         struct pe_handler_work_data *data;
1449         struct dasd_device *device;
1450
1451         data = container_of(work, struct pe_handler_work_data, worker);
1452         device = data->device;
1453
1454         /* delay path verification until device was resumed */
1455         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1456                 schedule_work(work);
1457                 return;
1458         }
1459         /* check if path verification already running and delay if so */
1460         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1461                 schedule_work(work);
1462                 return;
1463         }
1464
1465         if (data->tbvpm)
1466                 dasd_eckd_path_available_action(device, data);
1467         if (data->fcsecpm)
1468                 dasd_eckd_read_fc_security(device);
1469
1470         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1471         dasd_put_device(device);
1472         if (data->isglobal)
1473                 mutex_unlock(&dasd_pe_handler_mutex);
1474         else
1475                 kfree(data);
1476 }
1477
1478 static int dasd_eckd_pe_handler(struct dasd_device *device,
1479                                 __u8 tbvpm, __u8 fcsecpm)
1480 {
1481         struct pe_handler_work_data *data;
1482
1483         data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1484         if (!data) {
1485                 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1486                         data = pe_handler_worker;
1487                         data->isglobal = 1;
1488                 } else {
1489                         return -ENOMEM;
1490                 }
1491         }
1492         INIT_WORK(&data->worker, do_pe_handler_work);
1493         dasd_get_device(device);
1494         data->device = device;
1495         data->tbvpm = tbvpm;
1496         data->fcsecpm = fcsecpm;
1497         schedule_work(&data->worker);
1498         return 0;
1499 }
1500
1501 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1502 {
1503         struct dasd_eckd_private *private = device->private;
1504         unsigned long flags;
1505
1506         if (!private->fcx_max_data)
1507                 private->fcx_max_data = get_fcx_max_data(device);
1508         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1509         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1510         dasd_schedule_device_bh(device);
1511         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1512 }
1513
1514 static int dasd_eckd_read_features(struct dasd_device *device)
1515 {
1516         struct dasd_eckd_private *private = device->private;
1517         struct dasd_psf_prssd_data *prssdp;
1518         struct dasd_rssd_features *features;
1519         struct dasd_ccw_req *cqr;
1520         struct ccw1 *ccw;
1521         int rc;
1522
1523         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1524         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1525                                    (sizeof(struct dasd_psf_prssd_data) +
1526                                     sizeof(struct dasd_rssd_features)),
1527                                    device, NULL);
1528         if (IS_ERR(cqr)) {
1529                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1530                                 "allocate initialization request");
1531                 return PTR_ERR(cqr);
1532         }
1533         cqr->startdev = device;
1534         cqr->memdev = device;
1535         cqr->block = NULL;
1536         cqr->retries = 256;
1537         cqr->expires = 10 * HZ;
1538
1539         /* Prepare for Read Subsystem Data */
1540         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1541         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1542         prssdp->order = PSF_ORDER_PRSSD;
1543         prssdp->suborder = 0x41;        /* Read Feature Codes */
1544         /* all other bytes of prssdp must be zero */
1545
1546         ccw = cqr->cpaddr;
1547         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1548         ccw->count = sizeof(struct dasd_psf_prssd_data);
1549         ccw->flags |= CCW_FLAG_CC;
1550         ccw->cda = (__u32)virt_to_phys(prssdp);
1551
1552         /* Read Subsystem Data - feature codes */
1553         features = (struct dasd_rssd_features *) (prssdp + 1);
1554         memset(features, 0, sizeof(struct dasd_rssd_features));
1555
1556         ccw++;
1557         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1558         ccw->count = sizeof(struct dasd_rssd_features);
1559         ccw->cda = (__u32)virt_to_phys(features);
1560
1561         cqr->buildclk = get_tod_clock();
1562         cqr->status = DASD_CQR_FILLED;
1563         rc = dasd_sleep_on(cqr);
1564         if (rc == 0) {
1565                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1566                 features = (struct dasd_rssd_features *) (prssdp + 1);
1567                 memcpy(&private->features, features,
1568                        sizeof(struct dasd_rssd_features));
1569         } else
1570                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1571                          " failed with rc=%d\n", rc);
1572         dasd_sfree_request(cqr, cqr->memdev);
1573         return rc;
1574 }
1575
1576 /* Read Volume Information - Volume Storage Query */
1577 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1578 {
1579         struct dasd_eckd_private *private = device->private;
1580         struct dasd_psf_prssd_data *prssdp;
1581         struct dasd_rssd_vsq *vsq;
1582         struct dasd_ccw_req *cqr;
1583         struct ccw1 *ccw;
1584         int useglobal;
1585         int rc;
1586
1587         /* This command cannot be executed on an alias device */
1588         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1589             private->uid.type == UA_HYPER_PAV_ALIAS)
1590                 return 0;
1591
1592         useglobal = 0;
1593         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1594                                    sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1595         if (IS_ERR(cqr)) {
1596                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1597                                 "Could not allocate initialization request");
1598                 mutex_lock(&dasd_vol_info_mutex);
1599                 useglobal = 1;
1600                 cqr = &dasd_vol_info_req->cqr;
1601                 memset(cqr, 0, sizeof(*cqr));
1602                 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1603                 cqr->cpaddr = &dasd_vol_info_req->ccw;
1604                 cqr->data = &dasd_vol_info_req->data;
1605                 cqr->magic = DASD_ECKD_MAGIC;
1606         }
1607
1608         /* Prepare for Read Subsystem Data */
1609         prssdp = cqr->data;
1610         prssdp->order = PSF_ORDER_PRSSD;
1611         prssdp->suborder = PSF_SUBORDER_VSQ;    /* Volume Storage Query */
1612         prssdp->lss = private->conf.ned->ID;
1613         prssdp->volume = private->conf.ned->unit_addr;
1614
1615         ccw = cqr->cpaddr;
1616         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1617         ccw->count = sizeof(*prssdp);
1618         ccw->flags |= CCW_FLAG_CC;
1619         ccw->cda = (__u32)virt_to_phys(prssdp);
1620
1621         /* Read Subsystem Data - Volume Storage Query */
1622         vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1623         memset(vsq, 0, sizeof(*vsq));
1624
1625         ccw++;
1626         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1627         ccw->count = sizeof(*vsq);
1628         ccw->flags |= CCW_FLAG_SLI;
1629         ccw->cda = (__u32)virt_to_phys(vsq);
1630
1631         cqr->buildclk = get_tod_clock();
1632         cqr->status = DASD_CQR_FILLED;
1633         cqr->startdev = device;
1634         cqr->memdev = device;
1635         cqr->block = NULL;
1636         cqr->retries = 256;
1637         cqr->expires = device->default_expires * HZ;
1638         /* The command might not be supported. Suppress the error output */
1639         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1640
1641         rc = dasd_sleep_on_interruptible(cqr);
1642         if (rc == 0) {
1643                 memcpy(&private->vsq, vsq, sizeof(*vsq));
1644         } else {
1645                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1646                                 "Reading the volume storage information failed with rc=%d", rc);
1647         }
1648
1649         if (useglobal)
1650                 mutex_unlock(&dasd_vol_info_mutex);
1651         else
1652                 dasd_sfree_request(cqr, cqr->memdev);
1653
1654         return rc;
1655 }
1656
1657 static int dasd_eckd_is_ese(struct dasd_device *device)
1658 {
1659         struct dasd_eckd_private *private = device->private;
1660
1661         return private->vsq.vol_info.ese;
1662 }
1663
1664 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1665 {
1666         struct dasd_eckd_private *private = device->private;
1667
1668         return private->vsq.extent_pool_id;
1669 }
1670
1671 /*
1672  * This value represents the total amount of available space. As more space is
1673  * allocated by ESE volumes, this value will decrease.
1674  * The data for this value is therefore updated on any call.
1675  */
1676 static int dasd_eckd_space_configured(struct dasd_device *device)
1677 {
1678         struct dasd_eckd_private *private = device->private;
1679         int rc;
1680
1681         rc = dasd_eckd_read_vol_info(device);
1682
1683         return rc ? : private->vsq.space_configured;
1684 }
1685
1686 /*
1687  * The value of space allocated by an ESE volume may have changed and is
1688  * therefore updated on any call.
1689  */
1690 static int dasd_eckd_space_allocated(struct dasd_device *device)
1691 {
1692         struct dasd_eckd_private *private = device->private;
1693         int rc;
1694
1695         rc = dasd_eckd_read_vol_info(device);
1696
1697         return rc ? : private->vsq.space_allocated;
1698 }
1699
1700 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1701 {
1702         struct dasd_eckd_private *private = device->private;
1703
1704         return private->vsq.logical_capacity;
1705 }
1706
1707 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1708 {
1709         struct ext_pool_exhaust_work_data *data;
1710         struct dasd_device *device;
1711         struct dasd_device *base;
1712
1713         data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1714         device = data->device;
1715         base = data->base;
1716
1717         if (!base)
1718                 base = device;
1719         if (dasd_eckd_space_configured(base) != 0) {
1720                 dasd_generic_space_avail(device);
1721         } else {
1722                 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1723                 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1724         }
1725
1726         dasd_put_device(device);
1727         kfree(data);
1728 }
1729
1730 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1731                                       struct dasd_ccw_req *cqr)
1732 {
1733         struct ext_pool_exhaust_work_data *data;
1734
1735         data = kzalloc(sizeof(*data), GFP_ATOMIC);
1736         if (!data)
1737                 return -ENOMEM;
1738         INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1739         dasd_get_device(device);
1740         data->device = device;
1741
1742         if (cqr->block)
1743                 data->base = cqr->block->base;
1744         else if (cqr->basedev)
1745                 data->base = cqr->basedev;
1746         else
1747                 data->base = NULL;
1748
1749         schedule_work(&data->worker);
1750
1751         return 0;
1752 }
1753
1754 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1755                                         struct dasd_rssd_lcq *lcq)
1756 {
1757         struct dasd_eckd_private *private = device->private;
1758         int pool_id = dasd_eckd_ext_pool_id(device);
1759         struct dasd_ext_pool_sum eps;
1760         int i;
1761
1762         for (i = 0; i < lcq->pool_count; i++) {
1763                 eps = lcq->ext_pool_sum[i];
1764                 if (eps.pool_id == pool_id) {
1765                         memcpy(&private->eps, &eps,
1766                                sizeof(struct dasd_ext_pool_sum));
1767                 }
1768         }
1769 }
1770
1771 /* Read Extent Pool Information - Logical Configuration Query */
1772 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1773 {
1774         struct dasd_eckd_private *private = device->private;
1775         struct dasd_psf_prssd_data *prssdp;
1776         struct dasd_rssd_lcq *lcq;
1777         struct dasd_ccw_req *cqr;
1778         struct ccw1 *ccw;
1779         int rc;
1780
1781         /* This command cannot be executed on an alias device */
1782         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1783             private->uid.type == UA_HYPER_PAV_ALIAS)
1784                 return 0;
1785
1786         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1787                                    sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1788         if (IS_ERR(cqr)) {
1789                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1790                                 "Could not allocate initialization request");
1791                 return PTR_ERR(cqr);
1792         }
1793
1794         /* Prepare for Read Subsystem Data */
1795         prssdp = cqr->data;
1796         memset(prssdp, 0, sizeof(*prssdp));
1797         prssdp->order = PSF_ORDER_PRSSD;
1798         prssdp->suborder = PSF_SUBORDER_LCQ;    /* Logical Configuration Query */
1799
1800         ccw = cqr->cpaddr;
1801         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1802         ccw->count = sizeof(*prssdp);
1803         ccw->flags |= CCW_FLAG_CC;
1804         ccw->cda = (__u32)virt_to_phys(prssdp);
1805
1806         lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1807         memset(lcq, 0, sizeof(*lcq));
1808
1809         ccw++;
1810         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1811         ccw->count = sizeof(*lcq);
1812         ccw->flags |= CCW_FLAG_SLI;
1813         ccw->cda = (__u32)virt_to_phys(lcq);
1814
1815         cqr->buildclk = get_tod_clock();
1816         cqr->status = DASD_CQR_FILLED;
1817         cqr->startdev = device;
1818         cqr->memdev = device;
1819         cqr->block = NULL;
1820         cqr->retries = 256;
1821         cqr->expires = device->default_expires * HZ;
1822         /* The command might not be supported. Suppress the error output */
1823         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1824
1825         rc = dasd_sleep_on_interruptible(cqr);
1826         if (rc == 0) {
1827                 dasd_eckd_cpy_ext_pool_data(device, lcq);
1828         } else {
1829                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1830                                 "Reading the logical configuration failed with rc=%d", rc);
1831         }
1832
1833         dasd_sfree_request(cqr, cqr->memdev);
1834
1835         return rc;
1836 }
1837
1838 /*
1839  * Depending on the device type, the extent size is specified either as
1840  * cylinders per extent (CKD) or size per extent (FBA)
1841  * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1842  */
1843 static int dasd_eckd_ext_size(struct dasd_device *device)
1844 {
1845         struct dasd_eckd_private *private = device->private;
1846         struct dasd_ext_pool_sum eps = private->eps;
1847
1848         if (!eps.flags.extent_size_valid)
1849                 return 0;
1850         if (eps.extent_size.size_1G)
1851                 return 1113;
1852         if (eps.extent_size.size_16M)
1853                 return 21;
1854
1855         return 0;
1856 }
1857
1858 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1859 {
1860         struct dasd_eckd_private *private = device->private;
1861
1862         return private->eps.warn_thrshld;
1863 }
1864
1865 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1866 {
1867         struct dasd_eckd_private *private = device->private;
1868
1869         return private->eps.flags.capacity_at_warnlevel;
1870 }
1871
1872 /*
1873  * Extent Pool out of space
1874  */
1875 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1876 {
1877         struct dasd_eckd_private *private = device->private;
1878
1879         return private->eps.flags.pool_oos;
1880 }
1881
1882 /*
1883  * Build CP for Perform Subsystem Function - SSC.
1884  */
1885 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1886                                                     int enable_pav)
1887 {
1888         struct dasd_ccw_req *cqr;
1889         struct dasd_psf_ssc_data *psf_ssc_data;
1890         struct ccw1 *ccw;
1891
1892         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1893                                   sizeof(struct dasd_psf_ssc_data),
1894                                    device, NULL);
1895
1896         if (IS_ERR(cqr)) {
1897                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1898                            "Could not allocate PSF-SSC request");
1899                 return cqr;
1900         }
1901         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1902         psf_ssc_data->order = PSF_ORDER_SSC;
1903         psf_ssc_data->suborder = 0xc0;
1904         if (enable_pav) {
1905                 psf_ssc_data->suborder |= 0x08;
1906                 psf_ssc_data->reserved[0] = 0x88;
1907         }
1908         ccw = cqr->cpaddr;
1909         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1910         ccw->cda = (__u32)virt_to_phys(psf_ssc_data);
1911         ccw->count = 66;
1912
1913         cqr->startdev = device;
1914         cqr->memdev = device;
1915         cqr->block = NULL;
1916         cqr->retries = 256;
1917         cqr->expires = 10*HZ;
1918         cqr->buildclk = get_tod_clock();
1919         cqr->status = DASD_CQR_FILLED;
1920         return cqr;
1921 }
1922
1923 /*
1924  * Perform Subsystem Function.
1925  * It is necessary to trigger CIO for channel revalidation since this
1926  * call might change behaviour of DASD devices.
1927  */
1928 static int
1929 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1930                   unsigned long flags)
1931 {
1932         struct dasd_ccw_req *cqr;
1933         int rc;
1934
1935         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1936         if (IS_ERR(cqr))
1937                 return PTR_ERR(cqr);
1938
1939         /*
1940          * set flags e.g. turn on failfast, to prevent blocking
1941          * the calling function should handle failed requests
1942          */
1943         cqr->flags |= flags;
1944
1945         rc = dasd_sleep_on(cqr);
1946         if (!rc)
1947                 /* trigger CIO to reprobe devices */
1948                 css_schedule_reprobe();
1949         else if (cqr->intrc == -EAGAIN)
1950                 rc = -EAGAIN;
1951
1952         dasd_sfree_request(cqr, cqr->memdev);
1953         return rc;
1954 }
1955
1956 /*
1957  * Valide storage server of current device.
1958  */
1959 static int dasd_eckd_validate_server(struct dasd_device *device,
1960                                      unsigned long flags)
1961 {
1962         struct dasd_eckd_private *private = device->private;
1963         int enable_pav, rc;
1964
1965         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1966             private->uid.type == UA_HYPER_PAV_ALIAS)
1967                 return 0;
1968         if (dasd_nopav || MACHINE_IS_VM)
1969                 enable_pav = 0;
1970         else
1971                 enable_pav = 1;
1972         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1973
1974         /* may be requested feature is not available on server,
1975          * therefore just report error and go ahead */
1976         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1977                         "returned rc=%d", private->uid.ssid, rc);
1978         return rc;
1979 }
1980
1981 /*
1982  * worker to do a validate server in case of a lost pathgroup
1983  */
1984 static void dasd_eckd_do_validate_server(struct work_struct *work)
1985 {
1986         struct dasd_device *device = container_of(work, struct dasd_device,
1987                                                   kick_validate);
1988         unsigned long flags = 0;
1989
1990         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1991         if (dasd_eckd_validate_server(device, flags)
1992             == -EAGAIN) {
1993                 /* schedule worker again if failed */
1994                 schedule_work(&device->kick_validate);
1995                 return;
1996         }
1997
1998         dasd_put_device(device);
1999 }
2000
2001 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2002 {
2003         dasd_get_device(device);
2004         /* exit if device not online or in offline processing */
2005         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2006            device->state < DASD_STATE_ONLINE) {
2007                 dasd_put_device(device);
2008                 return;
2009         }
2010         /* queue call to do_validate_server to the kernel event daemon. */
2011         if (!schedule_work(&device->kick_validate))
2012                 dasd_put_device(device);
2013 }
2014
2015 /*
2016  * return if the device is the copy relation primary if a copy relation is active
2017  */
2018 static int dasd_device_is_primary(struct dasd_device *device)
2019 {
2020         if (!device->copy)
2021                 return 1;
2022
2023         if (device->copy->active->device == device)
2024                 return 1;
2025
2026         return 0;
2027 }
2028
2029 static int dasd_eckd_alloc_block(struct dasd_device *device)
2030 {
2031         struct dasd_block *block;
2032         struct dasd_uid temp_uid;
2033
2034         if (!dasd_device_is_primary(device))
2035                 return 0;
2036
2037         dasd_eckd_get_uid(device, &temp_uid);
2038         if (temp_uid.type == UA_BASE_DEVICE) {
2039                 block = dasd_alloc_block();
2040                 if (IS_ERR(block)) {
2041                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2042                                         "could not allocate dasd block structure");
2043                         return PTR_ERR(block);
2044                 }
2045                 device->block = block;
2046                 block->base = device;
2047         }
2048         return 0;
2049 }
2050
2051 static bool dasd_eckd_pprc_enabled(struct dasd_device *device)
2052 {
2053         struct dasd_eckd_private *private = device->private;
2054
2055         return private->rdc_data.facilities.PPRC_enabled;
2056 }
2057
2058 /*
2059  * Check device characteristics.
2060  * If the device is accessible using ECKD discipline, the device is enabled.
2061  */
2062 static int
2063 dasd_eckd_check_characteristics(struct dasd_device *device)
2064 {
2065         struct dasd_eckd_private *private = device->private;
2066         int rc, i;
2067         int readonly;
2068         unsigned long value;
2069
2070         /* setup work queue for validate server*/
2071         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2072         /* setup work queue for summary unit check */
2073         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2074
2075         if (!ccw_device_is_pathgroup(device->cdev)) {
2076                 dev_warn(&device->cdev->dev,
2077                          "A channel path group could not be established\n");
2078                 return -EIO;
2079         }
2080         if (!ccw_device_is_multipath(device->cdev)) {
2081                 dev_info(&device->cdev->dev,
2082                          "The DASD is not operating in multipath mode\n");
2083         }
2084         if (!private) {
2085                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2086                 if (!private) {
2087                         dev_warn(&device->cdev->dev,
2088                                  "Allocating memory for private DASD data "
2089                                  "failed\n");
2090                         return -ENOMEM;
2091                 }
2092                 device->private = private;
2093         } else {
2094                 memset(private, 0, sizeof(*private));
2095         }
2096         /* Invalidate status of initial analysis. */
2097         private->init_cqr_status = -1;
2098         /* Set default cache operations. */
2099         private->attrib.operation = DASD_NORMAL_CACHE;
2100         private->attrib.nr_cyl = 0;
2101
2102         /* Read Configuration Data */
2103         rc = dasd_eckd_read_conf(device);
2104         if (rc)
2105                 goto out_err1;
2106
2107         /* set some default values */
2108         device->default_expires = DASD_EXPIRES;
2109         device->default_retries = DASD_RETRIES;
2110         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2111         device->path_interval = DASD_ECKD_PATH_INTERVAL;
2112         device->aq_timeouts = DASD_RETRIES_MAX;
2113
2114         if (private->conf.gneq) {
2115                 value = 1;
2116                 for (i = 0; i < private->conf.gneq->timeout.value; i++)
2117                         value = 10 * value;
2118                 value = value * private->conf.gneq->timeout.number;
2119                 /* do not accept useless values */
2120                 if (value != 0 && value <= DASD_EXPIRES_MAX)
2121                         device->default_expires = value;
2122         }
2123
2124         /* Read Device Characteristics */
2125         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2126                                          &private->rdc_data, 64);
2127         if (rc) {
2128                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2129                                 "Read device characteristic failed, rc=%d", rc);
2130                 goto out_err1;
2131         }
2132
2133         /* setup PPRC for device from devmap */
2134         rc = dasd_devmap_set_device_copy_relation(device->cdev,
2135                                                   dasd_eckd_pprc_enabled(device));
2136         if (rc) {
2137                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2138                                 "copy relation setup failed, rc=%d", rc);
2139                 goto out_err1;
2140         }
2141
2142         /* check if block device is needed and allocate in case */
2143         rc = dasd_eckd_alloc_block(device);
2144         if (rc)
2145                 goto out_err1;
2146
2147         /* register lcu with alias handling, enable PAV */
2148         rc = dasd_alias_make_device_known_to_lcu(device);
2149         if (rc)
2150                 goto out_err2;
2151
2152         dasd_eckd_validate_server(device, 0);
2153
2154         /* device may report different configuration data after LCU setup */
2155         rc = dasd_eckd_read_conf(device);
2156         if (rc)
2157                 goto out_err3;
2158
2159         dasd_eckd_read_fc_security(device);
2160         dasd_path_create_kobjects(device);
2161
2162         /* Read Feature Codes */
2163         dasd_eckd_read_features(device);
2164
2165         /* Read Volume Information */
2166         dasd_eckd_read_vol_info(device);
2167
2168         /* Read Extent Pool Information */
2169         dasd_eckd_read_ext_pool_info(device);
2170
2171         if ((device->features & DASD_FEATURE_USERAW) &&
2172             !(private->rdc_data.facilities.RT_in_LR)) {
2173                 dev_err(&device->cdev->dev, "The storage server does not "
2174                         "support raw-track access\n");
2175                 rc = -EINVAL;
2176                 goto out_err3;
2177         }
2178
2179         /* find the valid cylinder size */
2180         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2181             private->rdc_data.long_no_cyl)
2182                 private->real_cyl = private->rdc_data.long_no_cyl;
2183         else
2184                 private->real_cyl = private->rdc_data.no_cyl;
2185
2186         private->fcx_max_data = get_fcx_max_data(device);
2187
2188         readonly = dasd_device_is_ro(device);
2189         if (readonly)
2190                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2191
2192         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2193                  "with %d cylinders, %d heads, %d sectors%s\n",
2194                  private->rdc_data.dev_type,
2195                  private->rdc_data.dev_model,
2196                  private->rdc_data.cu_type,
2197                  private->rdc_data.cu_model.model,
2198                  private->real_cyl,
2199                  private->rdc_data.trk_per_cyl,
2200                  private->rdc_data.sec_per_trk,
2201                  readonly ? ", read-only device" : "");
2202         return 0;
2203
2204 out_err3:
2205         dasd_alias_disconnect_device_from_lcu(device);
2206 out_err2:
2207         dasd_free_block(device->block);
2208         device->block = NULL;
2209 out_err1:
2210         dasd_eckd_clear_conf_data(device);
2211         dasd_path_remove_kobjects(device);
2212         kfree(device->private);
2213         device->private = NULL;
2214         return rc;
2215 }
2216
2217 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2218 {
2219         struct dasd_eckd_private *private = device->private;
2220
2221         if (!private)
2222                 return;
2223
2224         dasd_alias_disconnect_device_from_lcu(device);
2225         private->conf.ned = NULL;
2226         private->conf.sneq = NULL;
2227         private->conf.vdsneq = NULL;
2228         private->conf.gneq = NULL;
2229         dasd_eckd_clear_conf_data(device);
2230         dasd_path_remove_kobjects(device);
2231 }
2232
2233 static struct dasd_ccw_req *
2234 dasd_eckd_analysis_ccw(struct dasd_device *device)
2235 {
2236         struct dasd_eckd_private *private = device->private;
2237         struct eckd_count *count_data;
2238         struct LO_eckd_data *LO_data;
2239         struct dasd_ccw_req *cqr;
2240         struct ccw1 *ccw;
2241         int cplength, datasize;
2242         int i;
2243
2244         cplength = 8;
2245         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2246         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2247                                    NULL);
2248         if (IS_ERR(cqr))
2249                 return cqr;
2250         ccw = cqr->cpaddr;
2251         /* Define extent for the first 2 tracks. */
2252         define_extent(ccw++, cqr->data, 0, 1,
2253                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2254         LO_data = cqr->data + sizeof(struct DE_eckd_data);
2255         /* Locate record for the first 4 records on track 0. */
2256         ccw[-1].flags |= CCW_FLAG_CC;
2257         locate_record(ccw++, LO_data++, 0, 0, 4,
2258                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2259
2260         count_data = private->count_area;
2261         for (i = 0; i < 4; i++) {
2262                 ccw[-1].flags |= CCW_FLAG_CC;
2263                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2264                 ccw->flags = 0;
2265                 ccw->count = 8;
2266                 ccw->cda = (__u32)virt_to_phys(count_data);
2267                 ccw++;
2268                 count_data++;
2269         }
2270
2271         /* Locate record for the first record on track 1. */
2272         ccw[-1].flags |= CCW_FLAG_CC;
2273         locate_record(ccw++, LO_data++, 1, 0, 1,
2274                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2275         /* Read count ccw. */
2276         ccw[-1].flags |= CCW_FLAG_CC;
2277         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2278         ccw->flags = 0;
2279         ccw->count = 8;
2280         ccw->cda = (__u32)virt_to_phys(count_data);
2281
2282         cqr->block = NULL;
2283         cqr->startdev = device;
2284         cqr->memdev = device;
2285         cqr->retries = 255;
2286         cqr->buildclk = get_tod_clock();
2287         cqr->status = DASD_CQR_FILLED;
2288         /* Set flags to suppress output for expected errors */
2289         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2290
2291         return cqr;
2292 }
2293
2294 /* differentiate between 'no record found' and any other error */
2295 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2296 {
2297         char *sense;
2298         if (init_cqr->status == DASD_CQR_DONE)
2299                 return INIT_CQR_OK;
2300         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2301                  init_cqr->status == DASD_CQR_FAILED) {
2302                 sense = dasd_get_sense(&init_cqr->irb);
2303                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2304                         return INIT_CQR_UNFORMATTED;
2305                 else
2306                         return INIT_CQR_ERROR;
2307         } else
2308                 return INIT_CQR_ERROR;
2309 }
2310
2311 /*
2312  * This is the callback function for the init_analysis cqr. It saves
2313  * the status of the initial analysis ccw before it frees it and kicks
2314  * the device to continue the startup sequence. This will call
2315  * dasd_eckd_do_analysis again (if the devices has not been marked
2316  * for deletion in the meantime).
2317  */
2318 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2319                                         void *data)
2320 {
2321         struct dasd_device *device = init_cqr->startdev;
2322         struct dasd_eckd_private *private = device->private;
2323
2324         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2325         dasd_sfree_request(init_cqr, device);
2326         dasd_kick_device(device);
2327 }
2328
2329 static int dasd_eckd_start_analysis(struct dasd_block *block)
2330 {
2331         struct dasd_ccw_req *init_cqr;
2332
2333         init_cqr = dasd_eckd_analysis_ccw(block->base);
2334         if (IS_ERR(init_cqr))
2335                 return PTR_ERR(init_cqr);
2336         init_cqr->callback = dasd_eckd_analysis_callback;
2337         init_cqr->callback_data = NULL;
2338         init_cqr->expires = 5*HZ;
2339         /* first try without ERP, so we can later handle unformatted
2340          * devices as special case
2341          */
2342         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2343         init_cqr->retries = 0;
2344         dasd_add_request_head(init_cqr);
2345         return -EAGAIN;
2346 }
2347
2348 static int dasd_eckd_end_analysis(struct dasd_block *block)
2349 {
2350         struct dasd_device *device = block->base;
2351         struct dasd_eckd_private *private = device->private;
2352         struct eckd_count *count_area;
2353         unsigned int sb, blk_per_trk;
2354         int status, i;
2355         struct dasd_ccw_req *init_cqr;
2356
2357         status = private->init_cqr_status;
2358         private->init_cqr_status = -1;
2359         if (status == INIT_CQR_ERROR) {
2360                 /* try again, this time with full ERP */
2361                 init_cqr = dasd_eckd_analysis_ccw(device);
2362                 dasd_sleep_on(init_cqr);
2363                 status = dasd_eckd_analysis_evaluation(init_cqr);
2364                 dasd_sfree_request(init_cqr, device);
2365         }
2366
2367         if (device->features & DASD_FEATURE_USERAW) {
2368                 block->bp_block = DASD_RAW_BLOCKSIZE;
2369                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2370                 block->s2b_shift = 3;
2371                 goto raw;
2372         }
2373
2374         if (status == INIT_CQR_UNFORMATTED) {
2375                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2376                 return -EMEDIUMTYPE;
2377         } else if (status == INIT_CQR_ERROR) {
2378                 dev_err(&device->cdev->dev,
2379                         "Detecting the DASD disk layout failed because "
2380                         "of an I/O error\n");
2381                 return -EIO;
2382         }
2383
2384         private->uses_cdl = 1;
2385         /* Check Track 0 for Compatible Disk Layout */
2386         count_area = NULL;
2387         for (i = 0; i < 3; i++) {
2388                 if (private->count_area[i].kl != 4 ||
2389                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2390                     private->count_area[i].cyl != 0 ||
2391                     private->count_area[i].head != count_area_head[i] ||
2392                     private->count_area[i].record != count_area_rec[i]) {
2393                         private->uses_cdl = 0;
2394                         break;
2395                 }
2396         }
2397         if (i == 3)
2398                 count_area = &private->count_area[3];
2399
2400         if (private->uses_cdl == 0) {
2401                 for (i = 0; i < 5; i++) {
2402                         if ((private->count_area[i].kl != 0) ||
2403                             (private->count_area[i].dl !=
2404                              private->count_area[0].dl) ||
2405                             private->count_area[i].cyl !=  0 ||
2406                             private->count_area[i].head != count_area_head[i] ||
2407                             private->count_area[i].record != count_area_rec[i])
2408                                 break;
2409                 }
2410                 if (i == 5)
2411                         count_area = &private->count_area[0];
2412         } else {
2413                 if (private->count_area[3].record == 1)
2414                         dev_warn(&device->cdev->dev,
2415                                  "Track 0 has no records following the VTOC\n");
2416         }
2417
2418         if (count_area != NULL && count_area->kl == 0) {
2419                 /* we found notthing violating our disk layout */
2420                 if (dasd_check_blocksize(count_area->dl) == 0)
2421                         block->bp_block = count_area->dl;
2422         }
2423         if (block->bp_block == 0) {
2424                 dev_warn(&device->cdev->dev,
2425                          "The disk layout of the DASD is not supported\n");
2426                 return -EMEDIUMTYPE;
2427         }
2428         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2429         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2430                 block->s2b_shift++;
2431
2432         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2433
2434 raw:
2435         block->blocks = ((unsigned long) private->real_cyl *
2436                           private->rdc_data.trk_per_cyl *
2437                           blk_per_trk);
2438
2439         dev_info(&device->cdev->dev,
2440                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2441                  "%s\n", (block->bp_block >> 10),
2442                  (((unsigned long) private->real_cyl *
2443                    private->rdc_data.trk_per_cyl *
2444                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2445                  ((blk_per_trk * block->bp_block) >> 10),
2446                  private->uses_cdl ?
2447                  "compatible disk layout" : "linux disk layout");
2448
2449         return 0;
2450 }
2451
2452 static int dasd_eckd_do_analysis(struct dasd_block *block)
2453 {
2454         struct dasd_eckd_private *private = block->base->private;
2455
2456         if (private->init_cqr_status < 0)
2457                 return dasd_eckd_start_analysis(block);
2458         else
2459                 return dasd_eckd_end_analysis(block);
2460 }
2461
2462 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2463 {
2464         return dasd_alias_add_device(device);
2465 };
2466
2467 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2468 {
2469         if (cancel_work_sync(&device->reload_device))
2470                 dasd_put_device(device);
2471         if (cancel_work_sync(&device->kick_validate))
2472                 dasd_put_device(device);
2473
2474         return 0;
2475 };
2476
2477 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2478 {
2479         return dasd_alias_remove_device(device);
2480 };
2481
2482 static int
2483 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2484 {
2485         struct dasd_eckd_private *private = block->base->private;
2486
2487         if (dasd_check_blocksize(block->bp_block) == 0) {
2488                 geo->sectors = recs_per_track(&private->rdc_data,
2489                                               0, block->bp_block);
2490         }
2491         geo->cylinders = private->rdc_data.no_cyl;
2492         geo->heads = private->rdc_data.trk_per_cyl;
2493         return 0;
2494 }
2495
2496 /*
2497  * Build the TCW request for the format check
2498  */
2499 static struct dasd_ccw_req *
2500 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2501                           int enable_pav, struct eckd_count *fmt_buffer,
2502                           int rpt)
2503 {
2504         struct dasd_eckd_private *start_priv;
2505         struct dasd_device *startdev = NULL;
2506         struct tidaw *last_tidaw = NULL;
2507         struct dasd_ccw_req *cqr;
2508         struct itcw *itcw;
2509         int itcw_size;
2510         int count;
2511         int rc;
2512         int i;
2513
2514         if (enable_pav)
2515                 startdev = dasd_alias_get_start_dev(base);
2516
2517         if (!startdev)
2518                 startdev = base;
2519
2520         start_priv = startdev->private;
2521
2522         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2523
2524         /*
2525          * we're adding 'count' amount of tidaw to the itcw.
2526          * calculate the corresponding itcw_size
2527          */
2528         itcw_size = itcw_calc_size(0, count, 0);
2529
2530         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2531         if (IS_ERR(cqr))
2532                 return cqr;
2533
2534         start_priv->count++;
2535
2536         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2537         if (IS_ERR(itcw)) {
2538                 rc = -EINVAL;
2539                 goto out_err;
2540         }
2541
2542         cqr->cpaddr = itcw_get_tcw(itcw);
2543         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2544                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2545                           sizeof(struct eckd_count),
2546                           count * sizeof(struct eckd_count), 0, rpt);
2547         if (rc)
2548                 goto out_err;
2549
2550         for (i = 0; i < count; i++) {
2551                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2552                                             sizeof(struct eckd_count));
2553                 if (IS_ERR(last_tidaw)) {
2554                         rc = -EINVAL;
2555                         goto out_err;
2556                 }
2557         }
2558
2559         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2560         itcw_finalize(itcw);
2561
2562         cqr->cpmode = 1;
2563         cqr->startdev = startdev;
2564         cqr->memdev = startdev;
2565         cqr->basedev = base;
2566         cqr->retries = startdev->default_retries;
2567         cqr->expires = startdev->default_expires * HZ;
2568         cqr->buildclk = get_tod_clock();
2569         cqr->status = DASD_CQR_FILLED;
2570         /* Set flags to suppress output for expected errors */
2571         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2572         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2573
2574         return cqr;
2575
2576 out_err:
2577         dasd_sfree_request(cqr, startdev);
2578
2579         return ERR_PTR(rc);
2580 }
2581
2582 /*
2583  * Build the CCW request for the format check
2584  */
2585 static struct dasd_ccw_req *
2586 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2587                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2588 {
2589         struct dasd_eckd_private *start_priv;
2590         struct dasd_eckd_private *base_priv;
2591         struct dasd_device *startdev = NULL;
2592         struct dasd_ccw_req *cqr;
2593         struct ccw1 *ccw;
2594         void *data;
2595         int cplength, datasize;
2596         int use_prefix;
2597         int count;
2598         int i;
2599
2600         if (enable_pav)
2601                 startdev = dasd_alias_get_start_dev(base);
2602
2603         if (!startdev)
2604                 startdev = base;
2605
2606         start_priv = startdev->private;
2607         base_priv = base->private;
2608
2609         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2610
2611         use_prefix = base_priv->features.feature[8] & 0x01;
2612
2613         if (use_prefix) {
2614                 cplength = 1;
2615                 datasize = sizeof(struct PFX_eckd_data);
2616         } else {
2617                 cplength = 2;
2618                 datasize = sizeof(struct DE_eckd_data) +
2619                         sizeof(struct LO_eckd_data);
2620         }
2621         cplength += count;
2622
2623         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2624         if (IS_ERR(cqr))
2625                 return cqr;
2626
2627         start_priv->count++;
2628         data = cqr->data;
2629         ccw = cqr->cpaddr;
2630
2631         if (use_prefix) {
2632                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2633                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2634                            count, 0, 0);
2635         } else {
2636                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2637                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2638
2639                 data += sizeof(struct DE_eckd_data);
2640                 ccw[-1].flags |= CCW_FLAG_CC;
2641
2642                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2643                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2644         }
2645
2646         for (i = 0; i < count; i++) {
2647                 ccw[-1].flags |= CCW_FLAG_CC;
2648                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2649                 ccw->flags = CCW_FLAG_SLI;
2650                 ccw->count = 8;
2651                 ccw->cda = (__u32)virt_to_phys(fmt_buffer);
2652                 ccw++;
2653                 fmt_buffer++;
2654         }
2655
2656         cqr->startdev = startdev;
2657         cqr->memdev = startdev;
2658         cqr->basedev = base;
2659         cqr->retries = DASD_RETRIES;
2660         cqr->expires = startdev->default_expires * HZ;
2661         cqr->buildclk = get_tod_clock();
2662         cqr->status = DASD_CQR_FILLED;
2663         /* Set flags to suppress output for expected errors */
2664         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2665
2666         return cqr;
2667 }
2668
2669 static struct dasd_ccw_req *
2670 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2671                        struct format_data_t *fdata, int enable_pav)
2672 {
2673         struct dasd_eckd_private *base_priv;
2674         struct dasd_eckd_private *start_priv;
2675         struct dasd_ccw_req *fcp;
2676         struct eckd_count *ect;
2677         struct ch_t address;
2678         struct ccw1 *ccw;
2679         void *data;
2680         int rpt;
2681         int cplength, datasize;
2682         int i, j;
2683         int intensity = 0;
2684         int r0_perm;
2685         int nr_tracks;
2686         int use_prefix;
2687
2688         if (enable_pav)
2689                 startdev = dasd_alias_get_start_dev(base);
2690
2691         if (!startdev)
2692                 startdev = base;
2693
2694         start_priv = startdev->private;
2695         base_priv = base->private;
2696
2697         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2698
2699         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2700
2701         /*
2702          * fdata->intensity is a bit string that tells us what to do:
2703          *   Bit 0: write record zero
2704          *   Bit 1: write home address, currently not supported
2705          *   Bit 2: invalidate tracks
2706          *   Bit 3: use OS/390 compatible disk layout (cdl)
2707          *   Bit 4: do not allow storage subsystem to modify record zero
2708          * Only some bit combinations do make sense.
2709          */
2710         if (fdata->intensity & 0x10) {
2711                 r0_perm = 0;
2712                 intensity = fdata->intensity & ~0x10;
2713         } else {
2714                 r0_perm = 1;
2715                 intensity = fdata->intensity;
2716         }
2717
2718         use_prefix = base_priv->features.feature[8] & 0x01;
2719
2720         switch (intensity) {
2721         case 0x00:      /* Normal format */
2722         case 0x08:      /* Normal format, use cdl. */
2723                 cplength = 2 + (rpt*nr_tracks);
2724                 if (use_prefix)
2725                         datasize = sizeof(struct PFX_eckd_data) +
2726                                 sizeof(struct LO_eckd_data) +
2727                                 rpt * nr_tracks * sizeof(struct eckd_count);
2728                 else
2729                         datasize = sizeof(struct DE_eckd_data) +
2730                                 sizeof(struct LO_eckd_data) +
2731                                 rpt * nr_tracks * sizeof(struct eckd_count);
2732                 break;
2733         case 0x01:      /* Write record zero and format track. */
2734         case 0x09:      /* Write record zero and format track, use cdl. */
2735                 cplength = 2 + rpt * nr_tracks;
2736                 if (use_prefix)
2737                         datasize = sizeof(struct PFX_eckd_data) +
2738                                 sizeof(struct LO_eckd_data) +
2739                                 sizeof(struct eckd_count) +
2740                                 rpt * nr_tracks * sizeof(struct eckd_count);
2741                 else
2742                         datasize = sizeof(struct DE_eckd_data) +
2743                                 sizeof(struct LO_eckd_data) +
2744                                 sizeof(struct eckd_count) +
2745                                 rpt * nr_tracks * sizeof(struct eckd_count);
2746                 break;
2747         case 0x04:      /* Invalidate track. */
2748         case 0x0c:      /* Invalidate track, use cdl. */
2749                 cplength = 3;
2750                 if (use_prefix)
2751                         datasize = sizeof(struct PFX_eckd_data) +
2752                                 sizeof(struct LO_eckd_data) +
2753                                 sizeof(struct eckd_count);
2754                 else
2755                         datasize = sizeof(struct DE_eckd_data) +
2756                                 sizeof(struct LO_eckd_data) +
2757                                 sizeof(struct eckd_count);
2758                 break;
2759         default:
2760                 dev_warn(&startdev->cdev->dev,
2761                          "An I/O control call used incorrect flags 0x%x\n",
2762                          fdata->intensity);
2763                 return ERR_PTR(-EINVAL);
2764         }
2765
2766         fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2767         if (IS_ERR(fcp))
2768                 return fcp;
2769
2770         start_priv->count++;
2771         data = fcp->data;
2772         ccw = fcp->cpaddr;
2773
2774         switch (intensity & ~0x08) {
2775         case 0x00: /* Normal format. */
2776                 if (use_prefix) {
2777                         prefix(ccw++, (struct PFX_eckd_data *) data,
2778                                fdata->start_unit, fdata->stop_unit,
2779                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2780                         /* grant subsystem permission to format R0 */
2781                         if (r0_perm)
2782                                 ((struct PFX_eckd_data *)data)
2783                                         ->define_extent.ga_extended |= 0x04;
2784                         data += sizeof(struct PFX_eckd_data);
2785                 } else {
2786                         define_extent(ccw++, (struct DE_eckd_data *) data,
2787                                       fdata->start_unit, fdata->stop_unit,
2788                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2789                         /* grant subsystem permission to format R0 */
2790                         if (r0_perm)
2791                                 ((struct DE_eckd_data *) data)
2792                                         ->ga_extended |= 0x04;
2793                         data += sizeof(struct DE_eckd_data);
2794                 }
2795                 ccw[-1].flags |= CCW_FLAG_CC;
2796                 locate_record(ccw++, (struct LO_eckd_data *) data,
2797                               fdata->start_unit, 0, rpt*nr_tracks,
2798                               DASD_ECKD_CCW_WRITE_CKD, base,
2799                               fdata->blksize);
2800                 data += sizeof(struct LO_eckd_data);
2801                 break;
2802         case 0x01: /* Write record zero + format track. */
2803                 if (use_prefix) {
2804                         prefix(ccw++, (struct PFX_eckd_data *) data,
2805                                fdata->start_unit, fdata->stop_unit,
2806                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2807                                base, startdev);
2808                         data += sizeof(struct PFX_eckd_data);
2809                 } else {
2810                         define_extent(ccw++, (struct DE_eckd_data *) data,
2811                                fdata->start_unit, fdata->stop_unit,
2812                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2813                         data += sizeof(struct DE_eckd_data);
2814                 }
2815                 ccw[-1].flags |= CCW_FLAG_CC;
2816                 locate_record(ccw++, (struct LO_eckd_data *) data,
2817                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2818                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2819                               base->block->bp_block);
2820                 data += sizeof(struct LO_eckd_data);
2821                 break;
2822         case 0x04: /* Invalidate track. */
2823                 if (use_prefix) {
2824                         prefix(ccw++, (struct PFX_eckd_data *) data,
2825                                fdata->start_unit, fdata->stop_unit,
2826                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2827                         data += sizeof(struct PFX_eckd_data);
2828                 } else {
2829                         define_extent(ccw++, (struct DE_eckd_data *) data,
2830                                fdata->start_unit, fdata->stop_unit,
2831                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2832                         data += sizeof(struct DE_eckd_data);
2833                 }
2834                 ccw[-1].flags |= CCW_FLAG_CC;
2835                 locate_record(ccw++, (struct LO_eckd_data *) data,
2836                               fdata->start_unit, 0, 1,
2837                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2838                 data += sizeof(struct LO_eckd_data);
2839                 break;
2840         }
2841
2842         for (j = 0; j < nr_tracks; j++) {
2843                 /* calculate cylinder and head for the current track */
2844                 set_ch_t(&address,
2845                          (fdata->start_unit + j) /
2846                          base_priv->rdc_data.trk_per_cyl,
2847                          (fdata->start_unit + j) %
2848                          base_priv->rdc_data.trk_per_cyl);
2849                 if (intensity & 0x01) { /* write record zero */
2850                         ect = (struct eckd_count *) data;
2851                         data += sizeof(struct eckd_count);
2852                         ect->cyl = address.cyl;
2853                         ect->head = address.head;
2854                         ect->record = 0;
2855                         ect->kl = 0;
2856                         ect->dl = 8;
2857                         ccw[-1].flags |= CCW_FLAG_CC;
2858                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2859                         ccw->flags = CCW_FLAG_SLI;
2860                         ccw->count = 8;
2861                         ccw->cda = (__u32)virt_to_phys(ect);
2862                         ccw++;
2863                 }
2864                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2865                         ect = (struct eckd_count *) data;
2866                         data += sizeof(struct eckd_count);
2867                         ect->cyl = address.cyl;
2868                         ect->head = address.head;
2869                         ect->record = 1;
2870                         ect->kl = 0;
2871                         ect->dl = 0;
2872                         ccw[-1].flags |= CCW_FLAG_CC;
2873                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2874                         ccw->flags = CCW_FLAG_SLI;
2875                         ccw->count = 8;
2876                         ccw->cda = (__u32)virt_to_phys(ect);
2877                 } else {                /* write remaining records */
2878                         for (i = 0; i < rpt; i++) {
2879                                 ect = (struct eckd_count *) data;
2880                                 data += sizeof(struct eckd_count);
2881                                 ect->cyl = address.cyl;
2882                                 ect->head = address.head;
2883                                 ect->record = i + 1;
2884                                 ect->kl = 0;
2885                                 ect->dl = fdata->blksize;
2886                                 /*
2887                                  * Check for special tracks 0-1
2888                                  * when formatting CDL
2889                                  */
2890                                 if ((intensity & 0x08) &&
2891                                     address.cyl == 0 && address.head == 0) {
2892                                         if (i < 3) {
2893                                                 ect->kl = 4;
2894                                                 ect->dl = sizes_trk0[i] - 4;
2895                                         }
2896                                 }
2897                                 if ((intensity & 0x08) &&
2898                                     address.cyl == 0 && address.head == 1) {
2899                                         ect->kl = 44;
2900                                         ect->dl = LABEL_SIZE - 44;
2901                                 }
2902                                 ccw[-1].flags |= CCW_FLAG_CC;
2903                                 if (i != 0 || j == 0)
2904                                         ccw->cmd_code =
2905                                                 DASD_ECKD_CCW_WRITE_CKD;
2906                                 else
2907                                         ccw->cmd_code =
2908                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2909                                 ccw->flags = CCW_FLAG_SLI;
2910                                 ccw->count = 8;
2911                                 ccw->cda = (__u32)virt_to_phys(ect);
2912                                 ccw++;
2913                         }
2914                 }
2915         }
2916
2917         fcp->startdev = startdev;
2918         fcp->memdev = startdev;
2919         fcp->basedev = base;
2920         fcp->retries = 256;
2921         fcp->expires = startdev->default_expires * HZ;
2922         fcp->buildclk = get_tod_clock();
2923         fcp->status = DASD_CQR_FILLED;
2924
2925         return fcp;
2926 }
2927
2928 /*
2929  * Wrapper function to build a CCW request depending on input data
2930  */
2931 static struct dasd_ccw_req *
2932 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2933                                struct format_data_t *fdata, int enable_pav,
2934                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2935 {
2936         struct dasd_ccw_req *ccw_req;
2937
2938         if (!fmt_buffer) {
2939                 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2940         } else {
2941                 if (tpm)
2942                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2943                                                             enable_pav,
2944                                                             fmt_buffer, rpt);
2945                 else
2946                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2947                                                         fmt_buffer, rpt);
2948         }
2949
2950         return ccw_req;
2951 }
2952
2953 /*
2954  * Sanity checks on format_data
2955  */
2956 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2957                                           struct format_data_t *fdata)
2958 {
2959         struct dasd_eckd_private *private = base->private;
2960
2961         if (fdata->start_unit >=
2962             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2963                 dev_warn(&base->cdev->dev,
2964                          "Start track number %u used in formatting is too big\n",
2965                          fdata->start_unit);
2966                 return -EINVAL;
2967         }
2968         if (fdata->stop_unit >=
2969             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2970                 dev_warn(&base->cdev->dev,
2971                          "Stop track number %u used in formatting is too big\n",
2972                          fdata->stop_unit);
2973                 return -EINVAL;
2974         }
2975         if (fdata->start_unit > fdata->stop_unit) {
2976                 dev_warn(&base->cdev->dev,
2977                          "Start track %u used in formatting exceeds end track\n",
2978                          fdata->start_unit);
2979                 return -EINVAL;
2980         }
2981         if (dasd_check_blocksize(fdata->blksize) != 0) {
2982                 dev_warn(&base->cdev->dev,
2983                          "The DASD cannot be formatted with block size %u\n",
2984                          fdata->blksize);
2985                 return -EINVAL;
2986         }
2987         return 0;
2988 }
2989
2990 /*
2991  * This function will process format_data originally coming from an IOCTL
2992  */
2993 static int dasd_eckd_format_process_data(struct dasd_device *base,
2994                                          struct format_data_t *fdata,
2995                                          int enable_pav, int tpm,
2996                                          struct eckd_count *fmt_buffer, int rpt,
2997                                          struct irb *irb)
2998 {
2999         struct dasd_eckd_private *private = base->private;
3000         struct dasd_ccw_req *cqr, *n;
3001         struct list_head format_queue;
3002         struct dasd_device *device;
3003         char *sense = NULL;
3004         int old_start, old_stop, format_step;
3005         int step, retry;
3006         int rc;
3007
3008         rc = dasd_eckd_format_sanity_checks(base, fdata);
3009         if (rc)
3010                 return rc;
3011
3012         INIT_LIST_HEAD(&format_queue);
3013
3014         old_start = fdata->start_unit;
3015         old_stop = fdata->stop_unit;
3016
3017         if (!tpm && fmt_buffer != NULL) {
3018                 /* Command Mode / Format Check */
3019                 format_step = 1;
3020         } else if (tpm && fmt_buffer != NULL) {
3021                 /* Transport Mode / Format Check */
3022                 format_step = DASD_CQR_MAX_CCW / rpt;
3023         } else {
3024                 /* Normal Formatting */
3025                 format_step = DASD_CQR_MAX_CCW /
3026                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
3027         }
3028
3029         do {
3030                 retry = 0;
3031                 while (fdata->start_unit <= old_stop) {
3032                         step = fdata->stop_unit - fdata->start_unit + 1;
3033                         if (step > format_step) {
3034                                 fdata->stop_unit =
3035                                         fdata->start_unit + format_step - 1;
3036                         }
3037
3038                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
3039                                                              enable_pav, tpm,
3040                                                              fmt_buffer, rpt);
3041                         if (IS_ERR(cqr)) {
3042                                 rc = PTR_ERR(cqr);
3043                                 if (rc == -ENOMEM) {
3044                                         if (list_empty(&format_queue))
3045                                                 goto out;
3046                                         /*
3047                                          * not enough memory available, start
3048                                          * requests retry after first requests
3049                                          * were finished
3050                                          */
3051                                         retry = 1;
3052                                         break;
3053                                 }
3054                                 goto out_err;
3055                         }
3056                         list_add_tail(&cqr->blocklist, &format_queue);
3057
3058                         if (fmt_buffer) {
3059                                 step = fdata->stop_unit - fdata->start_unit + 1;
3060                                 fmt_buffer += rpt * step;
3061                         }
3062                         fdata->start_unit = fdata->stop_unit + 1;
3063                         fdata->stop_unit = old_stop;
3064                 }
3065
3066                 rc = dasd_sleep_on_queue(&format_queue);
3067
3068 out_err:
3069                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3070                         device = cqr->startdev;
3071                         private = device->private;
3072
3073                         if (cqr->status == DASD_CQR_FAILED) {
3074                                 /*
3075                                  * Only get sense data if called by format
3076                                  * check
3077                                  */
3078                                 if (fmt_buffer && irb) {
3079                                         sense = dasd_get_sense(&cqr->irb);
3080                                         memcpy(irb, &cqr->irb, sizeof(*irb));
3081                                 }
3082                                 rc = -EIO;
3083                         }
3084                         list_del_init(&cqr->blocklist);
3085                         dasd_ffree_request(cqr, device);
3086                         private->count--;
3087                 }
3088
3089                 if (rc && rc != -EIO)
3090                         goto out;
3091                 if (rc == -EIO) {
3092                         /*
3093                          * In case fewer than the expected records are on the
3094                          * track, we will most likely get a 'No Record Found'
3095                          * error (in command mode) or a 'File Protected' error
3096                          * (in transport mode). Those particular cases shouldn't
3097                          * pass the -EIO to the IOCTL, therefore reset the rc
3098                          * and continue.
3099                          */
3100                         if (sense &&
3101                             (sense[1] & SNS1_NO_REC_FOUND ||
3102                              sense[1] & SNS1_FILE_PROTECTED))
3103                                 retry = 1;
3104                         else
3105                                 goto out;
3106                 }
3107
3108         } while (retry);
3109
3110 out:
3111         fdata->start_unit = old_start;
3112         fdata->stop_unit = old_stop;
3113
3114         return rc;
3115 }
3116
3117 static int dasd_eckd_format_device(struct dasd_device *base,
3118                                    struct format_data_t *fdata, int enable_pav)
3119 {
3120         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3121                                              0, NULL);
3122 }
3123
3124 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3125                                       struct dasd_ccw_req *cqr)
3126 {
3127         struct dasd_block *block = cqr->block;
3128         struct dasd_format_entry *format;
3129         unsigned long flags;
3130         bool rc = false;
3131
3132         spin_lock_irqsave(&block->format_lock, flags);
3133         if (cqr->trkcount != atomic_read(&block->trkcount)) {
3134                 /*
3135                  * The number of formatted tracks has changed after request
3136                  * start and we can not tell if the current track was involved.
3137                  * To avoid data corruption treat it as if the current track is
3138                  * involved
3139                  */
3140                 rc = true;
3141                 goto out;
3142         }
3143         list_for_each_entry(format, &block->format_list, list) {
3144                 if (format->track == to_format->track) {
3145                         rc = true;
3146                         goto out;
3147                 }
3148         }
3149         list_add_tail(&to_format->list, &block->format_list);
3150
3151 out:
3152         spin_unlock_irqrestore(&block->format_lock, flags);
3153         return rc;
3154 }
3155
3156 static void clear_format_track(struct dasd_format_entry *format,
3157                               struct dasd_block *block)
3158 {
3159         unsigned long flags;
3160
3161         spin_lock_irqsave(&block->format_lock, flags);
3162         atomic_inc(&block->trkcount);
3163         list_del_init(&format->list);
3164         spin_unlock_irqrestore(&block->format_lock, flags);
3165 }
3166
3167 /*
3168  * Callback function to free ESE format requests.
3169  */
3170 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3171 {
3172         struct dasd_device *device = cqr->startdev;
3173         struct dasd_eckd_private *private = device->private;
3174         struct dasd_format_entry *format = data;
3175
3176         clear_format_track(format, cqr->basedev->block);
3177         private->count--;
3178         dasd_ffree_request(cqr, device);
3179 }
3180
3181 static struct dasd_ccw_req *
3182 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3183                      struct irb *irb)
3184 {
3185         struct dasd_eckd_private *private;
3186         struct dasd_format_entry *format;
3187         struct format_data_t fdata;
3188         unsigned int recs_per_trk;
3189         struct dasd_ccw_req *fcqr;
3190         struct dasd_device *base;
3191         struct dasd_block *block;
3192         unsigned int blksize;
3193         struct request *req;
3194         sector_t first_trk;
3195         sector_t last_trk;
3196         sector_t curr_trk;
3197         int rc;
3198
3199         req = dasd_get_callback_data(cqr);
3200         block = cqr->block;
3201         base = block->base;
3202         private = base->private;
3203         blksize = block->bp_block;
3204         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3205         format = &startdev->format_entry;
3206
3207         first_trk = blk_rq_pos(req) >> block->s2b_shift;
3208         sector_div(first_trk, recs_per_trk);
3209         last_trk =
3210                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3211         sector_div(last_trk, recs_per_trk);
3212         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3213         if (rc)
3214                 return ERR_PTR(rc);
3215
3216         if (curr_trk < first_trk || curr_trk > last_trk) {
3217                 DBF_DEV_EVENT(DBF_WARNING, startdev,
3218                               "ESE error track %llu not within range %llu - %llu\n",
3219                               curr_trk, first_trk, last_trk);
3220                 return ERR_PTR(-EINVAL);
3221         }
3222         format->track = curr_trk;
3223         /* test if track is already in formatting by another thread */
3224         if (test_and_set_format_track(format, cqr)) {
3225                 /* this is no real error so do not count down retries */
3226                 cqr->retries++;
3227                 return ERR_PTR(-EEXIST);
3228         }
3229
3230         fdata.start_unit = curr_trk;
3231         fdata.stop_unit = curr_trk;
3232         fdata.blksize = blksize;
3233         fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3234
3235         rc = dasd_eckd_format_sanity_checks(base, &fdata);
3236         if (rc)
3237                 return ERR_PTR(-EINVAL);
3238
3239         /*
3240          * We're building the request with PAV disabled as we're reusing
3241          * the former startdev.
3242          */
3243         fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3244         if (IS_ERR(fcqr))
3245                 return fcqr;
3246
3247         fcqr->callback = dasd_eckd_ese_format_cb;
3248         fcqr->callback_data = (void *) format;
3249
3250         return fcqr;
3251 }
3252
3253 /*
3254  * When data is read from an unformatted area of an ESE volume, this function
3255  * returns zeroed data and thereby mimics a read of zero data.
3256  *
3257  * The first unformatted track is the one that got the NRF error, the address is
3258  * encoded in the sense data.
3259  *
3260  * All tracks before have returned valid data and should not be touched.
3261  * All tracks after the unformatted track might be formatted or not. This is
3262  * currently not known, remember the processed data and return the remainder of
3263  * the request to the blocklayer in __dasd_cleanup_cqr().
3264  */
3265 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3266 {
3267         struct dasd_eckd_private *private;
3268         sector_t first_trk, last_trk;
3269         sector_t first_blk, last_blk;
3270         unsigned int blksize, off;
3271         unsigned int recs_per_trk;
3272         struct dasd_device *base;
3273         struct req_iterator iter;
3274         struct dasd_block *block;
3275         unsigned int skip_block;
3276         unsigned int blk_count;
3277         struct request *req;
3278         struct bio_vec bv;
3279         sector_t curr_trk;
3280         sector_t end_blk;
3281         char *dst;
3282         int rc;
3283
3284         req = (struct request *) cqr->callback_data;
3285         base = cqr->block->base;
3286         blksize = base->block->bp_block;
3287         block =  cqr->block;
3288         private = base->private;
3289         skip_block = 0;
3290         blk_count = 0;
3291
3292         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3293         first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3294         sector_div(first_trk, recs_per_trk);
3295         last_trk = last_blk =
3296                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3297         sector_div(last_trk, recs_per_trk);
3298         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3299         if (rc)
3300                 return rc;
3301
3302         /* sanity check if the current track from sense data is valid */
3303         if (curr_trk < first_trk || curr_trk > last_trk) {
3304                 DBF_DEV_EVENT(DBF_WARNING, base,
3305                               "ESE error track %llu not within range %llu - %llu\n",
3306                               curr_trk, first_trk, last_trk);
3307                 return -EINVAL;
3308         }
3309
3310         /*
3311          * if not the first track got the NRF error we have to skip over valid
3312          * blocks
3313          */
3314         if (curr_trk != first_trk)
3315                 skip_block = curr_trk * recs_per_trk - first_blk;
3316
3317         /* we have no information beyond the current track */
3318         end_blk = (curr_trk + 1) * recs_per_trk;
3319
3320         rq_for_each_segment(bv, req, iter) {
3321                 dst = bvec_virt(&bv);
3322                 for (off = 0; off < bv.bv_len; off += blksize) {
3323                         if (first_blk + blk_count >= end_blk) {
3324                                 cqr->proc_bytes = blk_count * blksize;
3325                                 return 0;
3326                         }
3327                         if (dst && !skip_block)
3328                                 memset(dst, 0, blksize);
3329                         else
3330                                 skip_block--;
3331                         dst += blksize;
3332                         blk_count++;
3333                 }
3334         }
3335         return 0;
3336 }
3337
3338 /*
3339  * Helper function to count consecutive records of a single track.
3340  */
3341 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3342                                    int max)
3343 {
3344         int head;
3345         int i;
3346
3347         head = fmt_buffer[start].head;
3348
3349         /*
3350          * There are 3 conditions where we stop counting:
3351          * - if data reoccurs (same head and record may reoccur), which may
3352          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
3353          * - when the head changes, because we're iterating over several tracks
3354          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
3355          * - when we've reached the end of sensible data in the buffer (the
3356          *   record will be 0 then)
3357          */
3358         for (i = start; i < max; i++) {
3359                 if (i > start) {
3360                         if ((fmt_buffer[i].head == head &&
3361                             fmt_buffer[i].record == 1) ||
3362                             fmt_buffer[i].head != head ||
3363                             fmt_buffer[i].record == 0)
3364                                 break;
3365                 }
3366         }
3367
3368         return i - start;
3369 }
3370
3371 /*
3372  * Evaluate a given range of tracks. Data like number of records, blocksize,
3373  * record ids, and key length are compared with expected data.
3374  *
3375  * If a mismatch occurs, the corresponding error bit is set, as well as
3376  * additional information, depending on the error.
3377  */
3378 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3379                                              struct format_check_t *cdata,
3380                                              int rpt_max, int rpt_exp,
3381                                              int trk_per_cyl, int tpm)
3382 {
3383         struct ch_t geo;
3384         int max_entries;
3385         int count = 0;
3386         int trkcount;
3387         int blksize;
3388         int pos = 0;
3389         int i, j;
3390         int kl;
3391
3392         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3393         max_entries = trkcount * rpt_max;
3394
3395         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3396                 /* Calculate the correct next starting position in the buffer */
3397                 if (tpm) {
3398                         while (fmt_buffer[pos].record == 0 &&
3399                                fmt_buffer[pos].dl == 0) {
3400                                 if (pos++ > max_entries)
3401                                         break;
3402                         }
3403                 } else {
3404                         if (i != cdata->expect.start_unit)
3405                                 pos += rpt_max - count;
3406                 }
3407
3408                 /* Calculate the expected geo values for the current track */
3409                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3410
3411                 /* Count and check number of records */
3412                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3413
3414                 if (count < rpt_exp) {
3415                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3416                         break;
3417                 }
3418                 if (count > rpt_exp) {
3419                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3420                         break;
3421                 }
3422
3423                 for (j = 0; j < count; j++, pos++) {
3424                         blksize = cdata->expect.blksize;
3425                         kl = 0;
3426
3427                         /*
3428                          * Set special values when checking CDL formatted
3429                          * devices.
3430                          */
3431                         if ((cdata->expect.intensity & 0x08) &&
3432                             geo.cyl == 0 && geo.head == 0) {
3433                                 if (j < 3) {
3434                                         blksize = sizes_trk0[j] - 4;
3435                                         kl = 4;
3436                                 }
3437                         }
3438                         if ((cdata->expect.intensity & 0x08) &&
3439                             geo.cyl == 0 && geo.head == 1) {
3440                                 blksize = LABEL_SIZE - 44;
3441                                 kl = 44;
3442                         }
3443
3444                         /* Check blocksize */
3445                         if (fmt_buffer[pos].dl != blksize) {
3446                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
3447                                 goto out;
3448                         }
3449                         /* Check if key length is 0 */
3450                         if (fmt_buffer[pos].kl != kl) {
3451                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3452                                 goto out;
3453                         }
3454                         /* Check if record_id is correct */
3455                         if (fmt_buffer[pos].cyl != geo.cyl ||
3456                             fmt_buffer[pos].head != geo.head ||
3457                             fmt_buffer[pos].record != (j + 1)) {
3458                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
3459                                 goto out;
3460                         }
3461                 }
3462         }
3463
3464 out:
3465         /*
3466          * In case of no errors, we need to decrease by one
3467          * to get the correct positions.
3468          */
3469         if (!cdata->result) {
3470                 i--;
3471                 pos--;
3472         }
3473
3474         cdata->unit = i;
3475         cdata->num_records = count;
3476         cdata->rec = fmt_buffer[pos].record;
3477         cdata->blksize = fmt_buffer[pos].dl;
3478         cdata->key_length = fmt_buffer[pos].kl;
3479 }
3480
3481 /*
3482  * Check the format of a range of tracks of a DASD.
3483  */
3484 static int dasd_eckd_check_device_format(struct dasd_device *base,
3485                                          struct format_check_t *cdata,
3486                                          int enable_pav)
3487 {
3488         struct dasd_eckd_private *private = base->private;
3489         struct eckd_count *fmt_buffer;
3490         struct irb irb;
3491         int rpt_max, rpt_exp;
3492         int fmt_buffer_size;
3493         int trk_per_cyl;
3494         int trkcount;
3495         int tpm = 0;
3496         int rc;
3497
3498         trk_per_cyl = private->rdc_data.trk_per_cyl;
3499
3500         /* Get maximum and expected amount of records per track */
3501         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3502         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3503
3504         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3505         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3506
3507         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3508         if (!fmt_buffer)
3509                 return -ENOMEM;
3510
3511         /*
3512          * A certain FICON feature subset is needed to operate in transport
3513          * mode. Additionally, the support for transport mode is implicitly
3514          * checked by comparing the buffer size with fcx_max_data. As long as
3515          * the buffer size is smaller we can operate in transport mode and
3516          * process multiple tracks. If not, only one track at once is being
3517          * processed using command mode.
3518          */
3519         if ((private->features.feature[40] & 0x04) &&
3520             fmt_buffer_size <= private->fcx_max_data)
3521                 tpm = 1;
3522
3523         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3524                                            tpm, fmt_buffer, rpt_max, &irb);
3525         if (rc && rc != -EIO)
3526                 goto out;
3527         if (rc == -EIO) {
3528                 /*
3529                  * If our first attempt with transport mode enabled comes back
3530                  * with an incorrect length error, we're going to retry the
3531                  * check with command mode.
3532                  */
3533                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3534                         tpm = 0;
3535                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
3536                                                            enable_pav, tpm,
3537                                                            fmt_buffer, rpt_max,
3538                                                            &irb);
3539                         if (rc)
3540                                 goto out;
3541                 } else {
3542                         goto out;
3543                 }
3544         }
3545
3546         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3547                                          trk_per_cyl, tpm);
3548
3549 out:
3550         kfree(fmt_buffer);
3551
3552         return rc;
3553 }
3554
3555 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3556 {
3557         if (cqr->retries < 0) {
3558                 cqr->status = DASD_CQR_FAILED;
3559                 return;
3560         }
3561         cqr->status = DASD_CQR_FILLED;
3562         if (cqr->block && (cqr->startdev != cqr->block->base)) {
3563                 dasd_eckd_reset_ccw_to_base_io(cqr);
3564                 cqr->startdev = cqr->block->base;
3565                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3566         }
3567 };
3568
3569 static dasd_erp_fn_t
3570 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3571 {
3572         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3573         struct ccw_device *cdev = device->cdev;
3574
3575         switch (cdev->id.cu_type) {
3576         case 0x3990:
3577         case 0x2105:
3578         case 0x2107:
3579         case 0x1750:
3580                 return dasd_3990_erp_action;
3581         case 0x9343:
3582         case 0x3880:
3583         default:
3584                 return dasd_default_erp_action;
3585         }
3586 }
3587
3588 static dasd_erp_fn_t
3589 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3590 {
3591         return dasd_default_erp_postaction;
3592 }
3593
3594 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3595                                               struct dasd_ccw_req *cqr,
3596                                               struct irb *irb)
3597 {
3598         char mask;
3599         char *sense = NULL;
3600         struct dasd_eckd_private *private = device->private;
3601
3602         /* first of all check for state change pending interrupt */
3603         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3604         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3605                 /*
3606                  * for alias only, not in offline processing
3607                  * and only if not suspended
3608                  */
3609                 if (!device->block && private->lcu &&
3610                     device->state == DASD_STATE_ONLINE &&
3611                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3612                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3613                         /* schedule worker to reload device */
3614                         dasd_reload_device(device);
3615                 }
3616                 dasd_generic_handle_state_change(device);
3617                 return;
3618         }
3619
3620         sense = dasd_get_sense(irb);
3621         if (!sense)
3622                 return;
3623
3624         /* summary unit check */
3625         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3626             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3627                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3628                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3629                                       "eckd suc: device already notified");
3630                         return;
3631                 }
3632                 sense = dasd_get_sense(irb);
3633                 if (!sense) {
3634                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3635                                       "eckd suc: no reason code available");
3636                         clear_bit(DASD_FLAG_SUC, &device->flags);
3637                         return;
3638
3639                 }
3640                 private->suc_reason = sense[8];
3641                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3642                               "eckd handle summary unit check: reason",
3643                               private->suc_reason);
3644                 dasd_get_device(device);
3645                 if (!schedule_work(&device->suc_work))
3646                         dasd_put_device(device);
3647
3648                 return;
3649         }
3650
3651         /* service information message SIM */
3652         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3653             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3654                 dasd_3990_erp_handle_sim(device, sense);
3655                 return;
3656         }
3657
3658         /* loss of device reservation is handled via base devices only
3659          * as alias devices may be used with several bases
3660          */
3661         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3662             (sense[7] == 0x3F) &&
3663             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3664             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3665                 if (device->features & DASD_FEATURE_FAILONSLCK)
3666                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3667                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3668                 dev_err(&device->cdev->dev,
3669                         "The device reservation was lost\n");
3670         }
3671 }
3672
3673 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3674                                        unsigned int first_trk,
3675                                        unsigned int last_trk)
3676 {
3677         struct dasd_eckd_private *private = device->private;
3678         unsigned int trks_per_vol;
3679         int rc = 0;
3680
3681         trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3682
3683         if (first_trk >= trks_per_vol) {
3684                 dev_warn(&device->cdev->dev,
3685                          "Start track number %u used in the space release command is too big\n",
3686                          first_trk);
3687                 rc = -EINVAL;
3688         } else if (last_trk >= trks_per_vol) {
3689                 dev_warn(&device->cdev->dev,
3690                          "Stop track number %u used in the space release command is too big\n",
3691                          last_trk);
3692                 rc = -EINVAL;
3693         } else if (first_trk > last_trk) {
3694                 dev_warn(&device->cdev->dev,
3695                          "Start track %u used in the space release command exceeds the end track\n",
3696                          first_trk);
3697                 rc = -EINVAL;
3698         }
3699         return rc;
3700 }
3701
3702 /*
3703  * Helper function to count the amount of involved extents within a given range
3704  * with extent alignment in mind.
3705  */
3706 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3707 {
3708         int cur_pos = 0;
3709         int count = 0;
3710         int tmp;
3711
3712         if (from == to)
3713                 return 1;
3714
3715         /* Count first partial extent */
3716         if (from % trks_per_ext != 0) {
3717                 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3718                 if (tmp > to)
3719                         tmp = to;
3720                 cur_pos = tmp - from + 1;
3721                 count++;
3722         }
3723         /* Count full extents */
3724         if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3725                 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3726                 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3727                 cur_pos = tmp;
3728         }
3729         /* Count last partial extent */
3730         if (cur_pos < to)
3731                 count++;
3732
3733         return count;
3734 }
3735
3736 /*
3737  * Release allocated space for a given range or an entire volume.
3738  */
3739 static struct dasd_ccw_req *
3740 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3741                   struct request *req, unsigned int first_trk,
3742                   unsigned int last_trk, int by_extent)
3743 {
3744         struct dasd_eckd_private *private = device->private;
3745         struct dasd_dso_ras_ext_range *ras_range;
3746         struct dasd_rssd_features *features;
3747         struct dasd_dso_ras_data *ras_data;
3748         u16 heads, beg_head, end_head;
3749         int cur_to_trk, cur_from_trk;
3750         struct dasd_ccw_req *cqr;
3751         u32 beg_cyl, end_cyl;
3752         struct ccw1 *ccw;
3753         int trks_per_ext;
3754         size_t ras_size;
3755         size_t size;
3756         int nr_exts;
3757         void *rq;
3758         int i;
3759
3760         if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3761                 return ERR_PTR(-EINVAL);
3762
3763         rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3764
3765         features = &private->features;
3766
3767         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3768         nr_exts = 0;
3769         if (by_extent)
3770                 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3771         ras_size = sizeof(*ras_data);
3772         size = ras_size + (nr_exts * sizeof(*ras_range));
3773
3774         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3775         if (IS_ERR(cqr)) {
3776                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3777                                 "Could not allocate RAS request");
3778                 return cqr;
3779         }
3780
3781         ras_data = cqr->data;
3782         memset(ras_data, 0, size);
3783
3784         ras_data->order = DSO_ORDER_RAS;
3785         ras_data->flags.vol_type = 0; /* CKD volume */
3786         /* Release specified extents or entire volume */
3787         ras_data->op_flags.by_extent = by_extent;
3788         /*
3789          * This bit guarantees initialisation of tracks within an extent that is
3790          * not fully specified, but is only supported with a certain feature
3791          * subset.
3792          */
3793         ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3794         ras_data->lss = private->conf.ned->ID;
3795         ras_data->dev_addr = private->conf.ned->unit_addr;
3796         ras_data->nr_exts = nr_exts;
3797
3798         if (by_extent) {
3799                 heads = private->rdc_data.trk_per_cyl;
3800                 cur_from_trk = first_trk;
3801                 cur_to_trk = first_trk + trks_per_ext -
3802                         (first_trk % trks_per_ext) - 1;
3803                 if (cur_to_trk > last_trk)
3804                         cur_to_trk = last_trk;
3805                 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3806
3807                 for (i = 0; i < nr_exts; i++) {
3808                         beg_cyl = cur_from_trk / heads;
3809                         beg_head = cur_from_trk % heads;
3810                         end_cyl = cur_to_trk / heads;
3811                         end_head = cur_to_trk % heads;
3812
3813                         set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3814                         set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3815
3816                         cur_from_trk = cur_to_trk + 1;
3817                         cur_to_trk = cur_from_trk + trks_per_ext - 1;
3818                         if (cur_to_trk > last_trk)
3819                                 cur_to_trk = last_trk;
3820                         ras_range++;
3821                 }
3822         }
3823
3824         ccw = cqr->cpaddr;
3825         ccw->cda = (__u32)virt_to_phys(cqr->data);
3826         ccw->cmd_code = DASD_ECKD_CCW_DSO;
3827         ccw->count = size;
3828
3829         cqr->startdev = device;
3830         cqr->memdev = device;
3831         cqr->block = block;
3832         cqr->retries = 256;
3833         cqr->expires = device->default_expires * HZ;
3834         cqr->buildclk = get_tod_clock();
3835         cqr->status = DASD_CQR_FILLED;
3836
3837         return cqr;
3838 }
3839
3840 static int dasd_eckd_release_space_full(struct dasd_device *device)
3841 {
3842         struct dasd_ccw_req *cqr;
3843         int rc;
3844
3845         cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3846         if (IS_ERR(cqr))
3847                 return PTR_ERR(cqr);
3848
3849         rc = dasd_sleep_on_interruptible(cqr);
3850
3851         dasd_sfree_request(cqr, cqr->memdev);
3852
3853         return rc;
3854 }
3855
3856 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3857                                         unsigned int from, unsigned int to)
3858 {
3859         struct dasd_eckd_private *private = device->private;
3860         struct dasd_block *block = device->block;
3861         struct dasd_ccw_req *cqr, *n;
3862         struct list_head ras_queue;
3863         unsigned int device_exts;
3864         int trks_per_ext;
3865         int stop, step;
3866         int cur_pos;
3867         int rc = 0;
3868         int retry;
3869
3870         INIT_LIST_HEAD(&ras_queue);
3871
3872         device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3873         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3874
3875         /* Make sure device limits are not exceeded */
3876         step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3877         cur_pos = from;
3878
3879         do {
3880                 retry = 0;
3881                 while (cur_pos < to) {
3882                         stop = cur_pos + step -
3883                                 ((cur_pos + step) % trks_per_ext) - 1;
3884                         if (stop > to)
3885                                 stop = to;
3886
3887                         cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3888                         if (IS_ERR(cqr)) {
3889                                 rc = PTR_ERR(cqr);
3890                                 if (rc == -ENOMEM) {
3891                                         if (list_empty(&ras_queue))
3892                                                 goto out;
3893                                         retry = 1;
3894                                         break;
3895                                 }
3896                                 goto err_out;
3897                         }
3898
3899                         spin_lock_irq(&block->queue_lock);
3900                         list_add_tail(&cqr->blocklist, &ras_queue);
3901                         spin_unlock_irq(&block->queue_lock);
3902                         cur_pos = stop + 1;
3903                 }
3904
3905                 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3906
3907 err_out:
3908                 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3909                         device = cqr->startdev;
3910                         private = device->private;
3911
3912                         spin_lock_irq(&block->queue_lock);
3913                         list_del_init(&cqr->blocklist);
3914                         spin_unlock_irq(&block->queue_lock);
3915                         dasd_sfree_request(cqr, device);
3916                         private->count--;
3917                 }
3918         } while (retry);
3919
3920 out:
3921         return rc;
3922 }
3923
3924 static int dasd_eckd_release_space(struct dasd_device *device,
3925                                    struct format_data_t *rdata)
3926 {
3927         if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3928                 return dasd_eckd_release_space_full(device);
3929         else if (rdata->intensity == 0)
3930                 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3931                                                     rdata->stop_unit);
3932         else
3933                 return -EINVAL;
3934 }
3935
3936 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3937                                                struct dasd_device *startdev,
3938                                                struct dasd_block *block,
3939                                                struct request *req,
3940                                                sector_t first_rec,
3941                                                sector_t last_rec,
3942                                                sector_t first_trk,
3943                                                sector_t last_trk,
3944                                                unsigned int first_offs,
3945                                                unsigned int last_offs,
3946                                                unsigned int blk_per_trk,
3947                                                unsigned int blksize)
3948 {
3949         struct dasd_eckd_private *private;
3950         unsigned long *idaws;
3951         struct LO_eckd_data *LO_data;
3952         struct dasd_ccw_req *cqr;
3953         struct ccw1 *ccw;
3954         struct req_iterator iter;
3955         struct bio_vec bv;
3956         char *dst;
3957         unsigned int off;
3958         int count, cidaw, cplength, datasize;
3959         sector_t recid;
3960         unsigned char cmd, rcmd;
3961         int use_prefix;
3962         struct dasd_device *basedev;
3963
3964         basedev = block->base;
3965         private = basedev->private;
3966         if (rq_data_dir(req) == READ)
3967                 cmd = DASD_ECKD_CCW_READ_MT;
3968         else if (rq_data_dir(req) == WRITE)
3969                 cmd = DASD_ECKD_CCW_WRITE_MT;
3970         else
3971                 return ERR_PTR(-EINVAL);
3972
3973         /* Check struct bio and count the number of blocks for the request. */
3974         count = 0;
3975         cidaw = 0;
3976         rq_for_each_segment(bv, req, iter) {
3977                 if (bv.bv_len & (blksize - 1))
3978                         /* Eckd can only do full blocks. */
3979                         return ERR_PTR(-EINVAL);
3980                 count += bv.bv_len >> (block->s2b_shift + 9);
3981                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3982                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3983         }
3984         /* Paranoia. */
3985         if (count != last_rec - first_rec + 1)
3986                 return ERR_PTR(-EINVAL);
3987
3988         /* use the prefix command if available */
3989         use_prefix = private->features.feature[8] & 0x01;
3990         if (use_prefix) {
3991                 /* 1x prefix + number of blocks */
3992                 cplength = 2 + count;
3993                 /* 1x prefix + cidaws*sizeof(long) */
3994                 datasize = sizeof(struct PFX_eckd_data) +
3995                         sizeof(struct LO_eckd_data) +
3996                         cidaw * sizeof(unsigned long);
3997         } else {
3998                 /* 1x define extent + 1x locate record + number of blocks */
3999                 cplength = 2 + count;
4000                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
4001                 datasize = sizeof(struct DE_eckd_data) +
4002                         sizeof(struct LO_eckd_data) +
4003                         cidaw * sizeof(unsigned long);
4004         }
4005         /* Find out the number of additional locate record ccws for cdl. */
4006         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
4007                 if (last_rec >= 2*blk_per_trk)
4008                         count = 2*blk_per_trk - first_rec;
4009                 cplength += count;
4010                 datasize += count*sizeof(struct LO_eckd_data);
4011         }
4012         /* Allocate the ccw request. */
4013         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4014                                    startdev, blk_mq_rq_to_pdu(req));
4015         if (IS_ERR(cqr))
4016                 return cqr;
4017         ccw = cqr->cpaddr;
4018         /* First ccw is define extent or prefix. */
4019         if (use_prefix) {
4020                 if (prefix(ccw++, cqr->data, first_trk,
4021                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
4022                         /* Clock not in sync and XRC is enabled.
4023                          * Try again later.
4024                          */
4025                         dasd_sfree_request(cqr, startdev);
4026                         return ERR_PTR(-EAGAIN);
4027                 }
4028                 idaws = (unsigned long *) (cqr->data +
4029                                            sizeof(struct PFX_eckd_data));
4030         } else {
4031                 if (define_extent(ccw++, cqr->data, first_trk,
4032                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
4033                         /* Clock not in sync and XRC is enabled.
4034                          * Try again later.
4035                          */
4036                         dasd_sfree_request(cqr, startdev);
4037                         return ERR_PTR(-EAGAIN);
4038                 }
4039                 idaws = (unsigned long *) (cqr->data +
4040                                            sizeof(struct DE_eckd_data));
4041         }
4042         /* Build locate_record+read/write/ccws. */
4043         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
4044         recid = first_rec;
4045         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
4046                 /* Only standard blocks so there is just one locate record. */
4047                 ccw[-1].flags |= CCW_FLAG_CC;
4048                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
4049                               last_rec - recid + 1, cmd, basedev, blksize);
4050         }
4051         rq_for_each_segment(bv, req, iter) {
4052                 dst = bvec_virt(&bv);
4053                 if (dasd_page_cache) {
4054                         char *copy = kmem_cache_alloc(dasd_page_cache,
4055                                                       GFP_DMA | __GFP_NOWARN);
4056                         if (copy && rq_data_dir(req) == WRITE)
4057                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4058                         if (copy)
4059                                 dst = copy + bv.bv_offset;
4060                 }
4061                 for (off = 0; off < bv.bv_len; off += blksize) {
4062                         sector_t trkid = recid;
4063                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
4064                         rcmd = cmd;
4065                         count = blksize;
4066                         /* Locate record for cdl special block ? */
4067                         if (private->uses_cdl && recid < 2*blk_per_trk) {
4068                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4069                                         rcmd |= 0x8;
4070                                         count = dasd_eckd_cdl_reclen(recid);
4071                                         if (count < blksize &&
4072                                             rq_data_dir(req) == READ)
4073                                                 memset(dst + count, 0xe5,
4074                                                        blksize - count);
4075                                 }
4076                                 ccw[-1].flags |= CCW_FLAG_CC;
4077                                 locate_record(ccw++, LO_data++,
4078                                               trkid, recoffs + 1,
4079                                               1, rcmd, basedev, count);
4080                         }
4081                         /* Locate record for standard blocks ? */
4082                         if (private->uses_cdl && recid == 2*blk_per_trk) {
4083                                 ccw[-1].flags |= CCW_FLAG_CC;
4084                                 locate_record(ccw++, LO_data++,
4085                                               trkid, recoffs + 1,
4086                                               last_rec - recid + 1,
4087                                               cmd, basedev, count);
4088                         }
4089                         /* Read/write ccw. */
4090                         ccw[-1].flags |= CCW_FLAG_CC;
4091                         ccw->cmd_code = rcmd;
4092                         ccw->count = count;
4093                         if (idal_is_needed(dst, blksize)) {
4094                                 ccw->cda = (__u32)virt_to_phys(idaws);
4095                                 ccw->flags = CCW_FLAG_IDA;
4096                                 idaws = idal_create_words(idaws, dst, blksize);
4097                         } else {
4098                                 ccw->cda = (__u32)virt_to_phys(dst);
4099                                 ccw->flags = 0;
4100                         }
4101                         ccw++;
4102                         dst += blksize;
4103                         recid++;
4104                 }
4105         }
4106         if (blk_noretry_request(req) ||
4107             block->base->features & DASD_FEATURE_FAILFAST)
4108                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4109         cqr->startdev = startdev;
4110         cqr->memdev = startdev;
4111         cqr->block = block;
4112         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4113         cqr->lpm = dasd_path_get_ppm(startdev);
4114         cqr->retries = startdev->default_retries;
4115         cqr->buildclk = get_tod_clock();
4116         cqr->status = DASD_CQR_FILLED;
4117
4118         /* Set flags to suppress output for expected errors */
4119         if (dasd_eckd_is_ese(basedev)) {
4120                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4121                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4122                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4123         }
4124
4125         return cqr;
4126 }
4127
4128 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4129                                                struct dasd_device *startdev,
4130                                                struct dasd_block *block,
4131                                                struct request *req,
4132                                                sector_t first_rec,
4133                                                sector_t last_rec,
4134                                                sector_t first_trk,
4135                                                sector_t last_trk,
4136                                                unsigned int first_offs,
4137                                                unsigned int last_offs,
4138                                                unsigned int blk_per_trk,
4139                                                unsigned int blksize)
4140 {
4141         unsigned long *idaws;
4142         struct dasd_ccw_req *cqr;
4143         struct ccw1 *ccw;
4144         struct req_iterator iter;
4145         struct bio_vec bv;
4146         char *dst, *idaw_dst;
4147         unsigned int cidaw, cplength, datasize;
4148         unsigned int tlf;
4149         sector_t recid;
4150         unsigned char cmd;
4151         struct dasd_device *basedev;
4152         unsigned int trkcount, count, count_to_trk_end;
4153         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4154         unsigned char new_track, end_idaw;
4155         sector_t trkid;
4156         unsigned int recoffs;
4157
4158         basedev = block->base;
4159         if (rq_data_dir(req) == READ)
4160                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4161         else if (rq_data_dir(req) == WRITE)
4162                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4163         else
4164                 return ERR_PTR(-EINVAL);
4165
4166         /* Track based I/O needs IDAWs for each page, and not just for
4167          * 64 bit addresses. We need additional idals for pages
4168          * that get filled from two tracks, so we use the number
4169          * of records as upper limit.
4170          */
4171         cidaw = last_rec - first_rec + 1;
4172         trkcount = last_trk - first_trk + 1;
4173
4174         /* 1x prefix + one read/write ccw per track */
4175         cplength = 1 + trkcount;
4176
4177         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4178
4179         /* Allocate the ccw request. */
4180         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4181                                    startdev, blk_mq_rq_to_pdu(req));
4182         if (IS_ERR(cqr))
4183                 return cqr;
4184         ccw = cqr->cpaddr;
4185         /* transfer length factor: how many bytes to read from the last track */
4186         if (first_trk == last_trk)
4187                 tlf = last_offs - first_offs + 1;
4188         else
4189                 tlf = last_offs + 1;
4190         tlf *= blksize;
4191
4192         if (prefix_LRE(ccw++, cqr->data, first_trk,
4193                        last_trk, cmd, basedev, startdev,
4194                        1 /* format */, first_offs + 1,
4195                        trkcount, blksize,
4196                        tlf) == -EAGAIN) {
4197                 /* Clock not in sync and XRC is enabled.
4198                  * Try again later.
4199                  */
4200                 dasd_sfree_request(cqr, startdev);
4201                 return ERR_PTR(-EAGAIN);
4202         }
4203
4204         /*
4205          * The translation of request into ccw programs must meet the
4206          * following conditions:
4207          * - all idaws but the first and the last must address full pages
4208          *   (or 2K blocks on 31-bit)
4209          * - the scope of a ccw and it's idal ends with the track boundaries
4210          */
4211         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4212         recid = first_rec;
4213         new_track = 1;
4214         end_idaw = 0;
4215         len_to_track_end = 0;
4216         idaw_dst = NULL;
4217         idaw_len = 0;
4218         rq_for_each_segment(bv, req, iter) {
4219                 dst = bvec_virt(&bv);
4220                 seg_len = bv.bv_len;
4221                 while (seg_len) {
4222                         if (new_track) {
4223                                 trkid = recid;
4224                                 recoffs = sector_div(trkid, blk_per_trk);
4225                                 count_to_trk_end = blk_per_trk - recoffs;
4226                                 count = min((last_rec - recid + 1),
4227                                             (sector_t)count_to_trk_end);
4228                                 len_to_track_end = count * blksize;
4229                                 ccw[-1].flags |= CCW_FLAG_CC;
4230                                 ccw->cmd_code = cmd;
4231                                 ccw->count = len_to_track_end;
4232                                 ccw->cda = (__u32)virt_to_phys(idaws);
4233                                 ccw->flags = CCW_FLAG_IDA;
4234                                 ccw++;
4235                                 recid += count;
4236                                 new_track = 0;
4237                                 /* first idaw for a ccw may start anywhere */
4238                                 if (!idaw_dst)
4239                                         idaw_dst = dst;
4240                         }
4241                         /* If we start a new idaw, we must make sure that it
4242                          * starts on an IDA_BLOCK_SIZE boundary.
4243                          * If we continue an idaw, we must make sure that the
4244                          * current segment begins where the so far accumulated
4245                          * idaw ends
4246                          */
4247                         if (!idaw_dst) {
4248                                 if ((__u32)virt_to_phys(dst) & (IDA_BLOCK_SIZE - 1)) {
4249                                         dasd_sfree_request(cqr, startdev);
4250                                         return ERR_PTR(-ERANGE);
4251                                 } else
4252                                         idaw_dst = dst;
4253                         }
4254                         if ((idaw_dst + idaw_len) != dst) {
4255                                 dasd_sfree_request(cqr, startdev);
4256                                 return ERR_PTR(-ERANGE);
4257                         }
4258                         part_len = min(seg_len, len_to_track_end);
4259                         seg_len -= part_len;
4260                         dst += part_len;
4261                         idaw_len += part_len;
4262                         len_to_track_end -= part_len;
4263                         /* collected memory area ends on an IDA_BLOCK border,
4264                          * -> create an idaw
4265                          * idal_create_words will handle cases where idaw_len
4266                          * is larger then IDA_BLOCK_SIZE
4267                          */
4268                         if (!((__u32)virt_to_phys(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE - 1)))
4269                                 end_idaw = 1;
4270                         /* We also need to end the idaw at track end */
4271                         if (!len_to_track_end) {
4272                                 new_track = 1;
4273                                 end_idaw = 1;
4274                         }
4275                         if (end_idaw) {
4276                                 idaws = idal_create_words(idaws, idaw_dst,
4277                                                           idaw_len);
4278                                 idaw_dst = NULL;
4279                                 idaw_len = 0;
4280                                 end_idaw = 0;
4281                         }
4282                 }
4283         }
4284
4285         if (blk_noretry_request(req) ||
4286             block->base->features & DASD_FEATURE_FAILFAST)
4287                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4288         cqr->startdev = startdev;
4289         cqr->memdev = startdev;
4290         cqr->block = block;
4291         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4292         cqr->lpm = dasd_path_get_ppm(startdev);
4293         cqr->retries = startdev->default_retries;
4294         cqr->buildclk = get_tod_clock();
4295         cqr->status = DASD_CQR_FILLED;
4296
4297         /* Set flags to suppress output for expected errors */
4298         if (dasd_eckd_is_ese(basedev))
4299                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4300
4301         return cqr;
4302 }
4303
4304 static int prepare_itcw(struct itcw *itcw,
4305                         unsigned int trk, unsigned int totrk, int cmd,
4306                         struct dasd_device *basedev,
4307                         struct dasd_device *startdev,
4308                         unsigned int rec_on_trk, int count,
4309                         unsigned int blksize,
4310                         unsigned int total_data_size,
4311                         unsigned int tlf,
4312                         unsigned int blk_per_trk)
4313 {
4314         struct PFX_eckd_data pfxdata;
4315         struct dasd_eckd_private *basepriv, *startpriv;
4316         struct DE_eckd_data *dedata;
4317         struct LRE_eckd_data *lredata;
4318         struct dcw *dcw;
4319
4320         u32 begcyl, endcyl;
4321         u16 heads, beghead, endhead;
4322         u8 pfx_cmd;
4323
4324         int rc = 0;
4325         int sector = 0;
4326         int dn, d;
4327
4328
4329         /* setup prefix data */
4330         basepriv = basedev->private;
4331         startpriv = startdev->private;
4332         dedata = &pfxdata.define_extent;
4333         lredata = &pfxdata.locate_record;
4334
4335         memset(&pfxdata, 0, sizeof(pfxdata));
4336         pfxdata.format = 1; /* PFX with LRE */
4337         pfxdata.base_address = basepriv->conf.ned->unit_addr;
4338         pfxdata.base_lss = basepriv->conf.ned->ID;
4339         pfxdata.validity.define_extent = 1;
4340
4341         /* private uid is kept up to date, conf_data may be outdated */
4342         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4343                 pfxdata.validity.verify_base = 1;
4344
4345         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4346                 pfxdata.validity.verify_base = 1;
4347                 pfxdata.validity.hyper_pav = 1;
4348         }
4349
4350         switch (cmd) {
4351         case DASD_ECKD_CCW_READ_TRACK_DATA:
4352                 dedata->mask.perm = 0x1;
4353                 dedata->attributes.operation = basepriv->attrib.operation;
4354                 dedata->blk_size = blksize;
4355                 dedata->ga_extended |= 0x42;
4356                 lredata->operation.orientation = 0x0;
4357                 lredata->operation.operation = 0x0C;
4358                 lredata->auxiliary.check_bytes = 0x01;
4359                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4360                 break;
4361         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4362                 dedata->mask.perm = 0x02;
4363                 dedata->attributes.operation = basepriv->attrib.operation;
4364                 dedata->blk_size = blksize;
4365                 rc = set_timestamp(NULL, dedata, basedev);
4366                 dedata->ga_extended |= 0x42;
4367                 lredata->operation.orientation = 0x0;
4368                 lredata->operation.operation = 0x3F;
4369                 lredata->extended_operation = 0x23;
4370                 lredata->auxiliary.check_bytes = 0x2;
4371                 /*
4372                  * If XRC is supported the System Time Stamp is set. The
4373                  * validity of the time stamp must be reflected in the prefix
4374                  * data as well.
4375                  */
4376                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4377                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4378                 pfx_cmd = DASD_ECKD_CCW_PFX;
4379                 break;
4380         case DASD_ECKD_CCW_READ_COUNT_MT:
4381                 dedata->mask.perm = 0x1;
4382                 dedata->attributes.operation = DASD_BYPASS_CACHE;
4383                 dedata->ga_extended |= 0x42;
4384                 dedata->blk_size = blksize;
4385                 lredata->operation.orientation = 0x2;
4386                 lredata->operation.operation = 0x16;
4387                 lredata->auxiliary.check_bytes = 0x01;
4388                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4389                 break;
4390         default:
4391                 DBF_DEV_EVENT(DBF_ERR, basedev,
4392                               "prepare itcw, unknown opcode 0x%x", cmd);
4393                 BUG();
4394                 break;
4395         }
4396         if (rc)
4397                 return rc;
4398
4399         dedata->attributes.mode = 0x3;  /* ECKD */
4400
4401         heads = basepriv->rdc_data.trk_per_cyl;
4402         begcyl = trk / heads;
4403         beghead = trk % heads;
4404         endcyl = totrk / heads;
4405         endhead = totrk % heads;
4406
4407         /* check for sequential prestage - enhance cylinder range */
4408         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4409             dedata->attributes.operation == DASD_SEQ_ACCESS) {
4410
4411                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4412                         endcyl += basepriv->attrib.nr_cyl;
4413                 else
4414                         endcyl = (basepriv->real_cyl - 1);
4415         }
4416
4417         set_ch_t(&dedata->beg_ext, begcyl, beghead);
4418         set_ch_t(&dedata->end_ext, endcyl, endhead);
4419
4420         dedata->ep_format = 0x20; /* records per track is valid */
4421         dedata->ep_rec_per_track = blk_per_trk;
4422
4423         if (rec_on_trk) {
4424                 switch (basepriv->rdc_data.dev_type) {
4425                 case 0x3390:
4426                         dn = ceil_quot(blksize + 6, 232);
4427                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4428                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4429                         break;
4430                 case 0x3380:
4431                         d = 7 + ceil_quot(blksize + 12, 32);
4432                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4433                         break;
4434                 }
4435         }
4436
4437         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4438                 lredata->auxiliary.length_valid = 0;
4439                 lredata->auxiliary.length_scope = 0;
4440                 lredata->sector = 0xff;
4441         } else {
4442                 lredata->auxiliary.length_valid = 1;
4443                 lredata->auxiliary.length_scope = 1;
4444                 lredata->sector = sector;
4445         }
4446         lredata->auxiliary.imbedded_ccw_valid = 1;
4447         lredata->length = tlf;
4448         lredata->imbedded_ccw = cmd;
4449         lredata->count = count;
4450         set_ch_t(&lredata->seek_addr, begcyl, beghead);
4451         lredata->search_arg.cyl = lredata->seek_addr.cyl;
4452         lredata->search_arg.head = lredata->seek_addr.head;
4453         lredata->search_arg.record = rec_on_trk;
4454
4455         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4456                      &pfxdata, sizeof(pfxdata), total_data_size);
4457         return PTR_ERR_OR_ZERO(dcw);
4458 }
4459
4460 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4461                                                struct dasd_device *startdev,
4462                                                struct dasd_block *block,
4463                                                struct request *req,
4464                                                sector_t first_rec,
4465                                                sector_t last_rec,
4466                                                sector_t first_trk,
4467                                                sector_t last_trk,
4468                                                unsigned int first_offs,
4469                                                unsigned int last_offs,
4470                                                unsigned int blk_per_trk,
4471                                                unsigned int blksize)
4472 {
4473         struct dasd_ccw_req *cqr;
4474         struct req_iterator iter;
4475         struct bio_vec bv;
4476         char *dst;
4477         unsigned int trkcount, ctidaw;
4478         unsigned char cmd;
4479         struct dasd_device *basedev;
4480         unsigned int tlf;
4481         struct itcw *itcw;
4482         struct tidaw *last_tidaw = NULL;
4483         int itcw_op;
4484         size_t itcw_size;
4485         u8 tidaw_flags;
4486         unsigned int seg_len, part_len, len_to_track_end;
4487         unsigned char new_track;
4488         sector_t recid, trkid;
4489         unsigned int offs;
4490         unsigned int count, count_to_trk_end;
4491         int ret;
4492
4493         basedev = block->base;
4494         if (rq_data_dir(req) == READ) {
4495                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4496                 itcw_op = ITCW_OP_READ;
4497         } else if (rq_data_dir(req) == WRITE) {
4498                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4499                 itcw_op = ITCW_OP_WRITE;
4500         } else
4501                 return ERR_PTR(-EINVAL);
4502
4503         /* trackbased I/O needs address all memory via TIDAWs,
4504          * not just for 64 bit addresses. This allows us to map
4505          * each segment directly to one tidaw.
4506          * In the case of write requests, additional tidaws may
4507          * be needed when a segment crosses a track boundary.
4508          */
4509         trkcount = last_trk - first_trk + 1;
4510         ctidaw = 0;
4511         rq_for_each_segment(bv, req, iter) {
4512                 ++ctidaw;
4513         }
4514         if (rq_data_dir(req) == WRITE)
4515                 ctidaw += (last_trk - first_trk);
4516
4517         /* Allocate the ccw request. */
4518         itcw_size = itcw_calc_size(0, ctidaw, 0);
4519         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4520                                    blk_mq_rq_to_pdu(req));
4521         if (IS_ERR(cqr))
4522                 return cqr;
4523
4524         /* transfer length factor: how many bytes to read from the last track */
4525         if (first_trk == last_trk)
4526                 tlf = last_offs - first_offs + 1;
4527         else
4528                 tlf = last_offs + 1;
4529         tlf *= blksize;
4530
4531         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4532         if (IS_ERR(itcw)) {
4533                 ret = -EINVAL;
4534                 goto out_error;
4535         }
4536         cqr->cpaddr = itcw_get_tcw(itcw);
4537         if (prepare_itcw(itcw, first_trk, last_trk,
4538                          cmd, basedev, startdev,
4539                          first_offs + 1,
4540                          trkcount, blksize,
4541                          (last_rec - first_rec + 1) * blksize,
4542                          tlf, blk_per_trk) == -EAGAIN) {
4543                 /* Clock not in sync and XRC is enabled.
4544                  * Try again later.
4545                  */
4546                 ret = -EAGAIN;
4547                 goto out_error;
4548         }
4549         len_to_track_end = 0;
4550         /*
4551          * A tidaw can address 4k of memory, but must not cross page boundaries
4552          * We can let the block layer handle this by setting
4553          * blk_queue_segment_boundary to page boundaries and
4554          * blk_max_segment_size to page size when setting up the request queue.
4555          * For write requests, a TIDAW must not cross track boundaries, because
4556          * we have to set the CBC flag on the last tidaw for each track.
4557          */
4558         if (rq_data_dir(req) == WRITE) {
4559                 new_track = 1;
4560                 recid = first_rec;
4561                 rq_for_each_segment(bv, req, iter) {
4562                         dst = bvec_virt(&bv);
4563                         seg_len = bv.bv_len;
4564                         while (seg_len) {
4565                                 if (new_track) {
4566                                         trkid = recid;
4567                                         offs = sector_div(trkid, blk_per_trk);
4568                                         count_to_trk_end = blk_per_trk - offs;
4569                                         count = min((last_rec - recid + 1),
4570                                                     (sector_t)count_to_trk_end);
4571                                         len_to_track_end = count * blksize;
4572                                         recid += count;
4573                                         new_track = 0;
4574                                 }
4575                                 part_len = min(seg_len, len_to_track_end);
4576                                 seg_len -= part_len;
4577                                 len_to_track_end -= part_len;
4578                                 /* We need to end the tidaw at track end */
4579                                 if (!len_to_track_end) {
4580                                         new_track = 1;
4581                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4582                                 } else
4583                                         tidaw_flags = 0;
4584                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4585                                                             dst, part_len);
4586                                 if (IS_ERR(last_tidaw)) {
4587                                         ret = -EINVAL;
4588                                         goto out_error;
4589                                 }
4590                                 dst += part_len;
4591                         }
4592                 }
4593         } else {
4594                 rq_for_each_segment(bv, req, iter) {
4595                         dst = bvec_virt(&bv);
4596                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
4597                                                     dst, bv.bv_len);
4598                         if (IS_ERR(last_tidaw)) {
4599                                 ret = -EINVAL;
4600                                 goto out_error;
4601                         }
4602                 }
4603         }
4604         last_tidaw->flags |= TIDAW_FLAGS_LAST;
4605         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4606         itcw_finalize(itcw);
4607
4608         if (blk_noretry_request(req) ||
4609             block->base->features & DASD_FEATURE_FAILFAST)
4610                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4611         cqr->cpmode = 1;
4612         cqr->startdev = startdev;
4613         cqr->memdev = startdev;
4614         cqr->block = block;
4615         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4616         cqr->lpm = dasd_path_get_ppm(startdev);
4617         cqr->retries = startdev->default_retries;
4618         cqr->buildclk = get_tod_clock();
4619         cqr->status = DASD_CQR_FILLED;
4620
4621         /* Set flags to suppress output for expected errors */
4622         if (dasd_eckd_is_ese(basedev)) {
4623                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4624                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4625                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4626         }
4627
4628         return cqr;
4629 out_error:
4630         dasd_sfree_request(cqr, startdev);
4631         return ERR_PTR(ret);
4632 }
4633
4634 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4635                                                struct dasd_block *block,
4636                                                struct request *req)
4637 {
4638         int cmdrtd, cmdwtd;
4639         int use_prefix;
4640         int fcx_multitrack;
4641         struct dasd_eckd_private *private;
4642         struct dasd_device *basedev;
4643         sector_t first_rec, last_rec;
4644         sector_t first_trk, last_trk;
4645         unsigned int first_offs, last_offs;
4646         unsigned int blk_per_trk, blksize;
4647         int cdlspecial;
4648         unsigned int data_size;
4649         struct dasd_ccw_req *cqr;
4650
4651         basedev = block->base;
4652         private = basedev->private;
4653
4654         /* Calculate number of blocks/records per track. */
4655         blksize = block->bp_block;
4656         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4657         if (blk_per_trk == 0)
4658                 return ERR_PTR(-EINVAL);
4659         /* Calculate record id of first and last block. */
4660         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4661         first_offs = sector_div(first_trk, blk_per_trk);
4662         last_rec = last_trk =
4663                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4664         last_offs = sector_div(last_trk, blk_per_trk);
4665         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4666
4667         fcx_multitrack = private->features.feature[40] & 0x20;
4668         data_size = blk_rq_bytes(req);
4669         if (data_size % blksize)
4670                 return ERR_PTR(-EINVAL);
4671         /* tpm write request add CBC data on each track boundary */
4672         if (rq_data_dir(req) == WRITE)
4673                 data_size += (last_trk - first_trk) * 4;
4674
4675         /* is read track data and write track data in command mode supported? */
4676         cmdrtd = private->features.feature[9] & 0x20;
4677         cmdwtd = private->features.feature[12] & 0x40;
4678         use_prefix = private->features.feature[8] & 0x01;
4679
4680         cqr = NULL;
4681         if (cdlspecial || dasd_page_cache) {
4682                 /* do nothing, just fall through to the cmd mode single case */
4683         } else if ((data_size <= private->fcx_max_data)
4684                    && (fcx_multitrack || (first_trk == last_trk))) {
4685                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4686                                                     first_rec, last_rec,
4687                                                     first_trk, last_trk,
4688                                                     first_offs, last_offs,
4689                                                     blk_per_trk, blksize);
4690                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4691                     (PTR_ERR(cqr) != -ENOMEM))
4692                         cqr = NULL;
4693         } else if (use_prefix &&
4694                    (((rq_data_dir(req) == READ) && cmdrtd) ||
4695                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4696                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4697                                                    first_rec, last_rec,
4698                                                    first_trk, last_trk,
4699                                                    first_offs, last_offs,
4700                                                    blk_per_trk, blksize);
4701                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4702                     (PTR_ERR(cqr) != -ENOMEM))
4703                         cqr = NULL;
4704         }
4705         if (!cqr)
4706                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4707                                                     first_rec, last_rec,
4708                                                     first_trk, last_trk,
4709                                                     first_offs, last_offs,
4710                                                     blk_per_trk, blksize);
4711         return cqr;
4712 }
4713
4714 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4715                                                    struct dasd_block *block,
4716                                                    struct request *req)
4717 {
4718         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4719         unsigned int seg_len, len_to_track_end;
4720         unsigned int cidaw, cplength, datasize;
4721         sector_t first_trk, last_trk, sectors;
4722         struct dasd_eckd_private *base_priv;
4723         struct dasd_device *basedev;
4724         struct req_iterator iter;
4725         struct dasd_ccw_req *cqr;
4726         unsigned int trkcount;
4727         unsigned long *idaws;
4728         unsigned int size;
4729         unsigned char cmd;
4730         struct bio_vec bv;
4731         struct ccw1 *ccw;
4732         int use_prefix;
4733         void *data;
4734         char *dst;
4735
4736         /*
4737          * raw track access needs to be mutiple of 64k and on 64k boundary
4738          * For read requests we can fix an incorrect alignment by padding
4739          * the request with dummy pages.
4740          */
4741         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4742         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4743                 DASD_RAW_SECTORS_PER_TRACK;
4744         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4745                 DASD_RAW_SECTORS_PER_TRACK;
4746         basedev = block->base;
4747         if ((start_padding_sectors || end_padding_sectors) &&
4748             (rq_data_dir(req) == WRITE)) {
4749                 DBF_DEV_EVENT(DBF_ERR, basedev,
4750                               "raw write not track aligned (%llu,%llu) req %p",
4751                               start_padding_sectors, end_padding_sectors, req);
4752                 return ERR_PTR(-EINVAL);
4753         }
4754
4755         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4756         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4757                 DASD_RAW_SECTORS_PER_TRACK;
4758         trkcount = last_trk - first_trk + 1;
4759
4760         if (rq_data_dir(req) == READ)
4761                 cmd = DASD_ECKD_CCW_READ_TRACK;
4762         else if (rq_data_dir(req) == WRITE)
4763                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4764         else
4765                 return ERR_PTR(-EINVAL);
4766
4767         /*
4768          * Raw track based I/O needs IDAWs for each page,
4769          * and not just for 64 bit addresses.
4770          */
4771         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4772
4773         /*
4774          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4775          * of extended parameter. This is needed for write full track.
4776          */
4777         base_priv = basedev->private;
4778         use_prefix = base_priv->features.feature[8] & 0x01;
4779         if (use_prefix) {
4780                 cplength = 1 + trkcount;
4781                 size = sizeof(struct PFX_eckd_data) + 2;
4782         } else {
4783                 cplength = 2 + trkcount;
4784                 size = sizeof(struct DE_eckd_data) +
4785                         sizeof(struct LRE_eckd_data) + 2;
4786         }
4787         size = ALIGN(size, 8);
4788
4789         datasize = size + cidaw * sizeof(unsigned long);
4790
4791         /* Allocate the ccw request. */
4792         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4793                                    datasize, startdev, blk_mq_rq_to_pdu(req));
4794         if (IS_ERR(cqr))
4795                 return cqr;
4796
4797         ccw = cqr->cpaddr;
4798         data = cqr->data;
4799
4800         if (use_prefix) {
4801                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4802                            startdev, 1, 0, trkcount, 0, 0);
4803         } else {
4804                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4805                 ccw[-1].flags |= CCW_FLAG_CC;
4806
4807                 data += sizeof(struct DE_eckd_data);
4808                 locate_record_ext(ccw++, data, first_trk, 0,
4809                                   trkcount, cmd, basedev, 0, 0);
4810         }
4811
4812         idaws = (unsigned long *)(cqr->data + size);
4813         len_to_track_end = 0;
4814         if (start_padding_sectors) {
4815                 ccw[-1].flags |= CCW_FLAG_CC;
4816                 ccw->cmd_code = cmd;
4817                 /* maximum 3390 track size */
4818                 ccw->count = 57326;
4819                 /* 64k map to one track */
4820                 len_to_track_end = 65536 - start_padding_sectors * 512;
4821                 ccw->cda = (__u32)virt_to_phys(idaws);
4822                 ccw->flags |= CCW_FLAG_IDA;
4823                 ccw->flags |= CCW_FLAG_SLI;
4824                 ccw++;
4825                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4826                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4827         }
4828         rq_for_each_segment(bv, req, iter) {
4829                 dst = bvec_virt(&bv);
4830                 seg_len = bv.bv_len;
4831                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4832                         memset(dst, 0, seg_len);
4833                 if (!len_to_track_end) {
4834                         ccw[-1].flags |= CCW_FLAG_CC;
4835                         ccw->cmd_code = cmd;
4836                         /* maximum 3390 track size */
4837                         ccw->count = 57326;
4838                         /* 64k map to one track */
4839                         len_to_track_end = 65536;
4840                         ccw->cda = (__u32)virt_to_phys(idaws);
4841                         ccw->flags |= CCW_FLAG_IDA;
4842                         ccw->flags |= CCW_FLAG_SLI;
4843                         ccw++;
4844                 }
4845                 len_to_track_end -= seg_len;
4846                 idaws = idal_create_words(idaws, dst, seg_len);
4847         }
4848         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4849                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4850         if (blk_noretry_request(req) ||
4851             block->base->features & DASD_FEATURE_FAILFAST)
4852                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4853         cqr->startdev = startdev;
4854         cqr->memdev = startdev;
4855         cqr->block = block;
4856         cqr->expires = startdev->default_expires * HZ;
4857         cqr->lpm = dasd_path_get_ppm(startdev);
4858         cqr->retries = startdev->default_retries;
4859         cqr->buildclk = get_tod_clock();
4860         cqr->status = DASD_CQR_FILLED;
4861
4862         return cqr;
4863 }
4864
4865
4866 static int
4867 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4868 {
4869         struct dasd_eckd_private *private;
4870         struct ccw1 *ccw;
4871         struct req_iterator iter;
4872         struct bio_vec bv;
4873         char *dst, *cda;
4874         unsigned int blksize, blk_per_trk, off;
4875         sector_t recid;
4876         int status;
4877
4878         if (!dasd_page_cache)
4879                 goto out;
4880         private = cqr->block->base->private;
4881         blksize = cqr->block->bp_block;
4882         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4883         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4884         ccw = cqr->cpaddr;
4885         /* Skip over define extent & locate record. */
4886         ccw++;
4887         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4888                 ccw++;
4889         rq_for_each_segment(bv, req, iter) {
4890                 dst = bvec_virt(&bv);
4891                 for (off = 0; off < bv.bv_len; off += blksize) {
4892                         /* Skip locate record. */
4893                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4894                                 ccw++;
4895                         if (dst) {
4896                                 if (ccw->flags & CCW_FLAG_IDA)
4897                                         cda = *((char **)phys_to_virt(ccw->cda));
4898                                 else
4899                                         cda = phys_to_virt(ccw->cda);
4900                                 if (dst != cda) {
4901                                         if (rq_data_dir(req) == READ)
4902                                                 memcpy(dst, cda, bv.bv_len);
4903                                         kmem_cache_free(dasd_page_cache,
4904                                             (void *)((addr_t)cda & PAGE_MASK));
4905                                 }
4906                                 dst = NULL;
4907                         }
4908                         ccw++;
4909                         recid++;
4910                 }
4911         }
4912 out:
4913         status = cqr->status == DASD_CQR_DONE;
4914         dasd_sfree_request(cqr, cqr->memdev);
4915         return status;
4916 }
4917
4918 /*
4919  * Modify ccw/tcw in cqr so it can be started on a base device.
4920  *
4921  * Note that this is not enough to restart the cqr!
4922  * Either reset cqr->startdev as well (summary unit check handling)
4923  * or restart via separate cqr (as in ERP handling).
4924  */
4925 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4926 {
4927         struct ccw1 *ccw;
4928         struct PFX_eckd_data *pfxdata;
4929         struct tcw *tcw;
4930         struct tccb *tccb;
4931         struct dcw *dcw;
4932
4933         if (cqr->cpmode == 1) {
4934                 tcw = cqr->cpaddr;
4935                 tccb = tcw_get_tccb(tcw);
4936                 dcw = (struct dcw *)&tccb->tca[0];
4937                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4938                 pfxdata->validity.verify_base = 0;
4939                 pfxdata->validity.hyper_pav = 0;
4940         } else {
4941                 ccw = cqr->cpaddr;
4942                 pfxdata = cqr->data;
4943                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4944                         pfxdata->validity.verify_base = 0;
4945                         pfxdata->validity.hyper_pav = 0;
4946                 }
4947         }
4948 }
4949
4950 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4951
4952 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4953                                                      struct dasd_block *block,
4954                                                      struct request *req)
4955 {
4956         struct dasd_eckd_private *private;
4957         struct dasd_device *startdev;
4958         unsigned long flags;
4959         struct dasd_ccw_req *cqr;
4960
4961         startdev = dasd_alias_get_start_dev(base);
4962         if (!startdev)
4963                 startdev = base;
4964         private = startdev->private;
4965         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4966                 return ERR_PTR(-EBUSY);
4967
4968         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4969         private->count++;
4970         if ((base->features & DASD_FEATURE_USERAW))
4971                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4972         else
4973                 cqr = dasd_eckd_build_cp(startdev, block, req);
4974         if (IS_ERR(cqr))
4975                 private->count--;
4976         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4977         return cqr;
4978 }
4979
4980 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4981                                    struct request *req)
4982 {
4983         struct dasd_eckd_private *private;
4984         unsigned long flags;
4985
4986         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4987         private = cqr->memdev->private;
4988         private->count--;
4989         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4990         return dasd_eckd_free_cp(cqr, req);
4991 }
4992
4993 static int
4994 dasd_eckd_fill_info(struct dasd_device * device,
4995                     struct dasd_information2_t * info)
4996 {
4997         struct dasd_eckd_private *private = device->private;
4998
4999         info->label_block = 2;
5000         info->FBA_layout = private->uses_cdl ? 0 : 1;
5001         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
5002         info->characteristics_size = sizeof(private->rdc_data);
5003         memcpy(info->characteristics, &private->rdc_data,
5004                sizeof(private->rdc_data));
5005         info->confdata_size = min_t(unsigned long, private->conf.len,
5006                                     sizeof(info->configuration_data));
5007         memcpy(info->configuration_data, private->conf.data,
5008                info->confdata_size);
5009         return 0;
5010 }
5011
5012 /*
5013  * SECTION: ioctl functions for eckd devices.
5014  */
5015
5016 /*
5017  * Release device ioctl.
5018  * Buils a channel programm to releases a prior reserved
5019  * (see dasd_eckd_reserve) device.
5020  */
5021 static int
5022 dasd_eckd_release(struct dasd_device *device)
5023 {
5024         struct dasd_ccw_req *cqr;
5025         int rc;
5026         struct ccw1 *ccw;
5027         int useglobal;
5028
5029         if (!capable(CAP_SYS_ADMIN))
5030                 return -EACCES;
5031
5032         useglobal = 0;
5033         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5034         if (IS_ERR(cqr)) {
5035                 mutex_lock(&dasd_reserve_mutex);
5036                 useglobal = 1;
5037                 cqr = &dasd_reserve_req->cqr;
5038                 memset(cqr, 0, sizeof(*cqr));
5039                 memset(&dasd_reserve_req->ccw, 0,
5040                        sizeof(dasd_reserve_req->ccw));
5041                 cqr->cpaddr = &dasd_reserve_req->ccw;
5042                 cqr->data = &dasd_reserve_req->data;
5043                 cqr->magic = DASD_ECKD_MAGIC;
5044         }
5045         ccw = cqr->cpaddr;
5046         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
5047         ccw->flags |= CCW_FLAG_SLI;
5048         ccw->count = 32;
5049         ccw->cda = (__u32)virt_to_phys(cqr->data);
5050         cqr->startdev = device;
5051         cqr->memdev = device;
5052         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5053         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5054         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5055         cqr->expires = 2 * HZ;
5056         cqr->buildclk = get_tod_clock();
5057         cqr->status = DASD_CQR_FILLED;
5058
5059         rc = dasd_sleep_on_immediatly(cqr);
5060         if (!rc)
5061                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5062
5063         if (useglobal)
5064                 mutex_unlock(&dasd_reserve_mutex);
5065         else
5066                 dasd_sfree_request(cqr, cqr->memdev);
5067         return rc;
5068 }
5069
5070 /*
5071  * Reserve device ioctl.
5072  * Options are set to 'synchronous wait for interrupt' and
5073  * 'timeout the request'. This leads to a terminate IO if
5074  * the interrupt is outstanding for a certain time.
5075  */
5076 static int
5077 dasd_eckd_reserve(struct dasd_device *device)
5078 {
5079         struct dasd_ccw_req *cqr;
5080         int rc;
5081         struct ccw1 *ccw;
5082         int useglobal;
5083
5084         if (!capable(CAP_SYS_ADMIN))
5085                 return -EACCES;
5086
5087         useglobal = 0;
5088         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5089         if (IS_ERR(cqr)) {
5090                 mutex_lock(&dasd_reserve_mutex);
5091                 useglobal = 1;
5092                 cqr = &dasd_reserve_req->cqr;
5093                 memset(cqr, 0, sizeof(*cqr));
5094                 memset(&dasd_reserve_req->ccw, 0,
5095                        sizeof(dasd_reserve_req->ccw));
5096                 cqr->cpaddr = &dasd_reserve_req->ccw;
5097                 cqr->data = &dasd_reserve_req->data;
5098                 cqr->magic = DASD_ECKD_MAGIC;
5099         }
5100         ccw = cqr->cpaddr;
5101         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5102         ccw->flags |= CCW_FLAG_SLI;
5103         ccw->count = 32;
5104         ccw->cda = (__u32)virt_to_phys(cqr->data);
5105         cqr->startdev = device;
5106         cqr->memdev = device;
5107         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5108         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5109         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5110         cqr->expires = 2 * HZ;
5111         cqr->buildclk = get_tod_clock();
5112         cqr->status = DASD_CQR_FILLED;
5113
5114         rc = dasd_sleep_on_immediatly(cqr);
5115         if (!rc)
5116                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5117
5118         if (useglobal)
5119                 mutex_unlock(&dasd_reserve_mutex);
5120         else
5121                 dasd_sfree_request(cqr, cqr->memdev);
5122         return rc;
5123 }
5124
5125 /*
5126  * Steal lock ioctl - unconditional reserve device.
5127  * Buils a channel programm to break a device's reservation.
5128  * (unconditional reserve)
5129  */
5130 static int
5131 dasd_eckd_steal_lock(struct dasd_device *device)
5132 {
5133         struct dasd_ccw_req *cqr;
5134         int rc;
5135         struct ccw1 *ccw;
5136         int useglobal;
5137
5138         if (!capable(CAP_SYS_ADMIN))
5139                 return -EACCES;
5140
5141         useglobal = 0;
5142         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5143         if (IS_ERR(cqr)) {
5144                 mutex_lock(&dasd_reserve_mutex);
5145                 useglobal = 1;
5146                 cqr = &dasd_reserve_req->cqr;
5147                 memset(cqr, 0, sizeof(*cqr));
5148                 memset(&dasd_reserve_req->ccw, 0,
5149                        sizeof(dasd_reserve_req->ccw));
5150                 cqr->cpaddr = &dasd_reserve_req->ccw;
5151                 cqr->data = &dasd_reserve_req->data;
5152                 cqr->magic = DASD_ECKD_MAGIC;
5153         }
5154         ccw = cqr->cpaddr;
5155         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5156         ccw->flags |= CCW_FLAG_SLI;
5157         ccw->count = 32;
5158         ccw->cda = (__u32)virt_to_phys(cqr->data);
5159         cqr->startdev = device;
5160         cqr->memdev = device;
5161         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5162         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5163         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5164         cqr->expires = 2 * HZ;
5165         cqr->buildclk = get_tod_clock();
5166         cqr->status = DASD_CQR_FILLED;
5167
5168         rc = dasd_sleep_on_immediatly(cqr);
5169         if (!rc)
5170                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5171
5172         if (useglobal)
5173                 mutex_unlock(&dasd_reserve_mutex);
5174         else
5175                 dasd_sfree_request(cqr, cqr->memdev);
5176         return rc;
5177 }
5178
5179 /*
5180  * SNID - Sense Path Group ID
5181  * This ioctl may be used in situations where I/O is stalled due to
5182  * a reserve, so if the normal dasd_smalloc_request fails, we use the
5183  * preallocated dasd_reserve_req.
5184  */
5185 static int dasd_eckd_snid(struct dasd_device *device,
5186                           void __user *argp)
5187 {
5188         struct dasd_ccw_req *cqr;
5189         int rc;
5190         struct ccw1 *ccw;
5191         int useglobal;
5192         struct dasd_snid_ioctl_data usrparm;
5193
5194         if (!capable(CAP_SYS_ADMIN))
5195                 return -EACCES;
5196
5197         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5198                 return -EFAULT;
5199
5200         useglobal = 0;
5201         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5202                                    sizeof(struct dasd_snid_data), device,
5203                                    NULL);
5204         if (IS_ERR(cqr)) {
5205                 mutex_lock(&dasd_reserve_mutex);
5206                 useglobal = 1;
5207                 cqr = &dasd_reserve_req->cqr;
5208                 memset(cqr, 0, sizeof(*cqr));
5209                 memset(&dasd_reserve_req->ccw, 0,
5210                        sizeof(dasd_reserve_req->ccw));
5211                 cqr->cpaddr = &dasd_reserve_req->ccw;
5212                 cqr->data = &dasd_reserve_req->data;
5213                 cqr->magic = DASD_ECKD_MAGIC;
5214         }
5215         ccw = cqr->cpaddr;
5216         ccw->cmd_code = DASD_ECKD_CCW_SNID;
5217         ccw->flags |= CCW_FLAG_SLI;
5218         ccw->count = 12;
5219         ccw->cda = (__u32)virt_to_phys(cqr->data);
5220         cqr->startdev = device;
5221         cqr->memdev = device;
5222         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5223         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5224         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5225         cqr->retries = 5;
5226         cqr->expires = 10 * HZ;
5227         cqr->buildclk = get_tod_clock();
5228         cqr->status = DASD_CQR_FILLED;
5229         cqr->lpm = usrparm.path_mask;
5230
5231         rc = dasd_sleep_on_immediatly(cqr);
5232         /* verify that I/O processing didn't modify the path mask */
5233         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5234                 rc = -EIO;
5235         if (!rc) {
5236                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5237                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5238                         rc = -EFAULT;
5239         }
5240
5241         if (useglobal)
5242                 mutex_unlock(&dasd_reserve_mutex);
5243         else
5244                 dasd_sfree_request(cqr, cqr->memdev);
5245         return rc;
5246 }
5247
5248 /*
5249  * Read performance statistics
5250  */
5251 static int
5252 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5253 {
5254         struct dasd_psf_prssd_data *prssdp;
5255         struct dasd_rssd_perf_stats_t *stats;
5256         struct dasd_ccw_req *cqr;
5257         struct ccw1 *ccw;
5258         int rc;
5259
5260         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
5261                                    (sizeof(struct dasd_psf_prssd_data) +
5262                                     sizeof(struct dasd_rssd_perf_stats_t)),
5263                                    device, NULL);
5264         if (IS_ERR(cqr)) {
5265                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5266                             "Could not allocate initialization request");
5267                 return PTR_ERR(cqr);
5268         }
5269         cqr->startdev = device;
5270         cqr->memdev = device;
5271         cqr->retries = 0;
5272         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5273         cqr->expires = 10 * HZ;
5274
5275         /* Prepare for Read Subsystem Data */
5276         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5277         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5278         prssdp->order = PSF_ORDER_PRSSD;
5279         prssdp->suborder = 0x01;        /* Performance Statistics */
5280         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
5281
5282         ccw = cqr->cpaddr;
5283         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5284         ccw->count = sizeof(struct dasd_psf_prssd_data);
5285         ccw->flags |= CCW_FLAG_CC;
5286         ccw->cda = (__u32)virt_to_phys(prssdp);
5287
5288         /* Read Subsystem Data - Performance Statistics */
5289         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5290         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5291
5292         ccw++;
5293         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5294         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5295         ccw->cda = (__u32)virt_to_phys(stats);
5296
5297         cqr->buildclk = get_tod_clock();
5298         cqr->status = DASD_CQR_FILLED;
5299         rc = dasd_sleep_on(cqr);
5300         if (rc == 0) {
5301                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5302                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5303                 if (copy_to_user(argp, stats,
5304                                  sizeof(struct dasd_rssd_perf_stats_t)))
5305                         rc = -EFAULT;
5306         }
5307         dasd_sfree_request(cqr, cqr->memdev);
5308         return rc;
5309 }
5310
5311 /*
5312  * Get attributes (cache operations)
5313  * Returnes the cache attributes used in Define Extend (DE).
5314  */
5315 static int
5316 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5317 {
5318         struct dasd_eckd_private *private = device->private;
5319         struct attrib_data_t attrib = private->attrib;
5320         int rc;
5321
5322         if (!capable(CAP_SYS_ADMIN))
5323                 return -EACCES;
5324         if (!argp)
5325                 return -EINVAL;
5326
5327         rc = 0;
5328         if (copy_to_user(argp, (long *) &attrib,
5329                          sizeof(struct attrib_data_t)))
5330                 rc = -EFAULT;
5331
5332         return rc;
5333 }
5334
5335 /*
5336  * Set attributes (cache operations)
5337  * Stores the attributes for cache operation to be used in Define Extend (DE).
5338  */
5339 static int
5340 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5341 {
5342         struct dasd_eckd_private *private = device->private;
5343         struct attrib_data_t attrib;
5344
5345         if (!capable(CAP_SYS_ADMIN))
5346                 return -EACCES;
5347         if (!argp)
5348                 return -EINVAL;
5349
5350         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5351                 return -EFAULT;
5352         private->attrib = attrib;
5353
5354         dev_info(&device->cdev->dev,
5355                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5356                  private->attrib.operation, private->attrib.nr_cyl);
5357         return 0;
5358 }
5359
5360 /*
5361  * Issue syscall I/O to EMC Symmetrix array.
5362  * CCWs are PSF and RSSD
5363  */
5364 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5365 {
5366         struct dasd_symmio_parms usrparm;
5367         char *psf_data, *rssd_result;
5368         struct dasd_ccw_req *cqr;
5369         struct ccw1 *ccw;
5370         char psf0, psf1;
5371         int rc;
5372
5373         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5374                 return -EACCES;
5375         psf0 = psf1 = 0;
5376
5377         /* Copy parms from caller */
5378         rc = -EFAULT;
5379         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5380                 goto out;
5381         if (is_compat_task()) {
5382                 /* Make sure pointers are sane even on 31 bit. */
5383                 rc = -EINVAL;
5384                 if ((usrparm.psf_data >> 32) != 0)
5385                         goto out;
5386                 if ((usrparm.rssd_result >> 32) != 0)
5387                         goto out;
5388                 usrparm.psf_data &= 0x7fffffffULL;
5389                 usrparm.rssd_result &= 0x7fffffffULL;
5390         }
5391         /* at least 2 bytes are accessed and should be allocated */
5392         if (usrparm.psf_data_len < 2) {
5393                 DBF_DEV_EVENT(DBF_WARNING, device,
5394                               "Symmetrix ioctl invalid data length %d",
5395                               usrparm.psf_data_len);
5396                 rc = -EINVAL;
5397                 goto out;
5398         }
5399         /* alloc I/O data area */
5400         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5401         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5402         if (!psf_data || !rssd_result) {
5403                 rc = -ENOMEM;
5404                 goto out_free;
5405         }
5406
5407         /* get syscall header from user space */
5408         rc = -EFAULT;
5409         if (copy_from_user(psf_data,
5410                            (void __user *)(unsigned long) usrparm.psf_data,
5411                            usrparm.psf_data_len))
5412                 goto out_free;
5413         psf0 = psf_data[0];
5414         psf1 = psf_data[1];
5415
5416         /* setup CCWs for PSF + RSSD */
5417         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5418         if (IS_ERR(cqr)) {
5419                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5420                         "Could not allocate initialization request");
5421                 rc = PTR_ERR(cqr);
5422                 goto out_free;
5423         }
5424
5425         cqr->startdev = device;
5426         cqr->memdev = device;
5427         cqr->retries = 3;
5428         cqr->expires = 10 * HZ;
5429         cqr->buildclk = get_tod_clock();
5430         cqr->status = DASD_CQR_FILLED;
5431
5432         /* Build the ccws */
5433         ccw = cqr->cpaddr;
5434
5435         /* PSF ccw */
5436         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5437         ccw->count = usrparm.psf_data_len;
5438         ccw->flags |= CCW_FLAG_CC;
5439         ccw->cda = (__u32)virt_to_phys(psf_data);
5440
5441         ccw++;
5442
5443         /* RSSD ccw  */
5444         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5445         ccw->count = usrparm.rssd_result_len;
5446         ccw->flags = CCW_FLAG_SLI ;
5447         ccw->cda = (__u32)virt_to_phys(rssd_result);
5448
5449         rc = dasd_sleep_on(cqr);
5450         if (rc)
5451                 goto out_sfree;
5452
5453         rc = -EFAULT;
5454         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5455                            rssd_result, usrparm.rssd_result_len))
5456                 goto out_sfree;
5457         rc = 0;
5458
5459 out_sfree:
5460         dasd_sfree_request(cqr, cqr->memdev);
5461 out_free:
5462         kfree(rssd_result);
5463         kfree(psf_data);
5464 out:
5465         DBF_DEV_EVENT(DBF_WARNING, device,
5466                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5467                       (int) psf0, (int) psf1, rc);
5468         return rc;
5469 }
5470
5471 static int
5472 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5473 {
5474         struct dasd_device *device = block->base;
5475
5476         switch (cmd) {
5477         case BIODASDGATTR:
5478                 return dasd_eckd_get_attrib(device, argp);
5479         case BIODASDSATTR:
5480                 return dasd_eckd_set_attrib(device, argp);
5481         case BIODASDPSRD:
5482                 return dasd_eckd_performance(device, argp);
5483         case BIODASDRLSE:
5484                 return dasd_eckd_release(device);
5485         case BIODASDRSRV:
5486                 return dasd_eckd_reserve(device);
5487         case BIODASDSLCK:
5488                 return dasd_eckd_steal_lock(device);
5489         case BIODASDSNID:
5490                 return dasd_eckd_snid(device, argp);
5491         case BIODASDSYMMIO:
5492                 return dasd_symm_io(device, argp);
5493         default:
5494                 return -ENOTTY;
5495         }
5496 }
5497
5498 /*
5499  * Dump the range of CCWs into 'page' buffer
5500  * and return number of printed chars.
5501  */
5502 static void
5503 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5504 {
5505         int len, count;
5506         char *datap;
5507
5508         len = 0;
5509         while (from <= to) {
5510                 len += sprintf(page + len, PRINTK_HEADER
5511                                " CCW %p: %08X %08X DAT:",
5512                                from, ((int *) from)[0], ((int *) from)[1]);
5513
5514                 /* get pointer to data (consider IDALs) */
5515                 if (from->flags & CCW_FLAG_IDA)
5516                         datap = (char *)*((addr_t *)phys_to_virt(from->cda));
5517                 else
5518                         datap = phys_to_virt(from->cda);
5519
5520                 /* dump data (max 128 bytes) */
5521                 for (count = 0; count < from->count && count < 128; count++) {
5522                         if (count % 32 == 0)
5523                                 len += sprintf(page + len, "\n");
5524                         if (count % 8 == 0)
5525                                 len += sprintf(page + len, " ");
5526                         if (count % 4 == 0)
5527                                 len += sprintf(page + len, " ");
5528                         len += sprintf(page + len, "%02x", datap[count]);
5529                 }
5530                 len += sprintf(page + len, "\n");
5531                 from++;
5532         }
5533         if (len > 0)
5534                 printk(KERN_ERR "%s", page);
5535 }
5536
5537 static void
5538 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5539                          char *reason)
5540 {
5541         u64 *sense;
5542         u64 *stat;
5543
5544         sense = (u64 *) dasd_get_sense(irb);
5545         stat = (u64 *) &irb->scsw;
5546         if (sense) {
5547                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5548                               "%016llx %016llx %016llx %016llx",
5549                               reason, *stat, *((u32 *) (stat + 1)),
5550                               sense[0], sense[1], sense[2], sense[3]);
5551         } else {
5552                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5553                               reason, *stat, *((u32 *) (stat + 1)),
5554                               "NO VALID SENSE");
5555         }
5556 }
5557
5558 /*
5559  * Print sense data and related channel program.
5560  * Parts are printed because printk buffer is only 1024 bytes.
5561  */
5562 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5563                                  struct dasd_ccw_req *req, struct irb *irb)
5564 {
5565         char *page;
5566         struct ccw1 *first, *last, *fail, *from, *to;
5567         int len, sl, sct;
5568
5569         page = (char *) get_zeroed_page(GFP_ATOMIC);
5570         if (page == NULL) {
5571                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5572                               "No memory to dump sense data\n");
5573                 return;
5574         }
5575         /* dump the sense data */
5576         len = sprintf(page, PRINTK_HEADER
5577                       " I/O status report for device %s:\n",
5578                       dev_name(&device->cdev->dev));
5579         len += sprintf(page + len, PRINTK_HEADER
5580                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5581                        "CS:%02X RC:%d\n",
5582                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5583                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5584                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5585                        req ? req->intrc : 0);
5586         len += sprintf(page + len, PRINTK_HEADER
5587                        " device %s: Failing CCW: %p\n",
5588                        dev_name(&device->cdev->dev),
5589                        phys_to_virt(irb->scsw.cmd.cpa));
5590         if (irb->esw.esw0.erw.cons) {
5591                 for (sl = 0; sl < 4; sl++) {
5592                         len += sprintf(page + len, PRINTK_HEADER
5593                                        " Sense(hex) %2d-%2d:",
5594                                        (8 * sl), ((8 * sl) + 7));
5595
5596                         for (sct = 0; sct < 8; sct++) {
5597                                 len += sprintf(page + len, " %02x",
5598                                                irb->ecw[8 * sl + sct]);
5599                         }
5600                         len += sprintf(page + len, "\n");
5601                 }
5602
5603                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5604                         /* 24 Byte Sense Data */
5605                         sprintf(page + len, PRINTK_HEADER
5606                                 " 24 Byte: %x MSG %x, "
5607                                 "%s MSGb to SYSOP\n",
5608                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5609                                 irb->ecw[1] & 0x10 ? "" : "no");
5610                 } else {
5611                         /* 32 Byte Sense Data */
5612                         sprintf(page + len, PRINTK_HEADER
5613                                 " 32 Byte: Format: %x "
5614                                 "Exception class %x\n",
5615                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5616                 }
5617         } else {
5618                 sprintf(page + len, PRINTK_HEADER
5619                         " SORRY - NO VALID SENSE AVAILABLE\n");
5620         }
5621         printk(KERN_ERR "%s", page);
5622
5623         if (req) {
5624                 /* req == NULL for unsolicited interrupts */
5625                 /* dump the Channel Program (max 140 Bytes per line) */
5626                 /* Count CCW and print first CCWs (maximum 7) */
5627                 first = req->cpaddr;
5628                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5629                 to = min(first + 6, last);
5630                 printk(KERN_ERR PRINTK_HEADER " Related CP in req: %p\n", req);
5631                 dasd_eckd_dump_ccw_range(first, to, page);
5632
5633                 /* print failing CCW area (maximum 4) */
5634                 /* scsw->cda is either valid or zero  */
5635                 from = ++to;
5636                 fail = phys_to_virt(irb->scsw.cmd.cpa); /* failing CCW */
5637                 if (from <  fail - 2) {
5638                         from = fail - 2;     /* there is a gap - print header */
5639                         printk(KERN_ERR PRINTK_HEADER "......\n");
5640                 }
5641                 to = min(fail + 1, last);
5642                 dasd_eckd_dump_ccw_range(from, to, page + len);
5643
5644                 /* print last CCWs (maximum 2) */
5645                 len = 0;
5646                 from = max(from, ++to);
5647                 if (from < last - 1) {
5648                         from = last - 1;     /* there is a gap - print header */
5649                         printk(KERN_ERR PRINTK_HEADER "......\n");
5650                 }
5651                 dasd_eckd_dump_ccw_range(from, last, page + len);
5652         }
5653         free_page((unsigned long) page);
5654 }
5655
5656
5657 /*
5658  * Print sense data from a tcw.
5659  */
5660 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5661                                  struct dasd_ccw_req *req, struct irb *irb)
5662 {
5663         char *page;
5664         int len, sl, sct, residual;
5665         struct tsb *tsb;
5666         u8 *sense, *rcq;
5667
5668         page = (char *) get_zeroed_page(GFP_ATOMIC);
5669         if (page == NULL) {
5670                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5671                             "No memory to dump sense data");
5672                 return;
5673         }
5674         /* dump the sense data */
5675         len = sprintf(page, PRINTK_HEADER
5676                       " I/O status report for device %s:\n",
5677                       dev_name(&device->cdev->dev));
5678         len += sprintf(page + len, PRINTK_HEADER
5679                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5680                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5681                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5682                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5683                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5684                        irb->scsw.tm.fcxs,
5685                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5686                        req ? req->intrc : 0);
5687         len += sprintf(page + len, PRINTK_HEADER
5688                        " device %s: Failing TCW: %p\n",
5689                        dev_name(&device->cdev->dev),
5690                        phys_to_virt(irb->scsw.tm.tcw));
5691
5692         tsb = NULL;
5693         sense = NULL;
5694         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5695                 tsb = tcw_get_tsb(phys_to_virt(irb->scsw.tm.tcw));
5696
5697         if (tsb) {
5698                 len += sprintf(page + len, PRINTK_HEADER
5699                                " tsb->length %d\n", tsb->length);
5700                 len += sprintf(page + len, PRINTK_HEADER
5701                                " tsb->flags %x\n", tsb->flags);
5702                 len += sprintf(page + len, PRINTK_HEADER
5703                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
5704                 len += sprintf(page + len, PRINTK_HEADER
5705                                " tsb->count %d\n", tsb->count);
5706                 residual = tsb->count - 28;
5707                 len += sprintf(page + len, PRINTK_HEADER
5708                                " residual %d\n", residual);
5709
5710                 switch (tsb->flags & 0x07) {
5711                 case 1: /* tsa_iostat */
5712                         len += sprintf(page + len, PRINTK_HEADER
5713                                " tsb->tsa.iostat.dev_time %d\n",
5714                                        tsb->tsa.iostat.dev_time);
5715                         len += sprintf(page + len, PRINTK_HEADER
5716                                " tsb->tsa.iostat.def_time %d\n",
5717                                        tsb->tsa.iostat.def_time);
5718                         len += sprintf(page + len, PRINTK_HEADER
5719                                " tsb->tsa.iostat.queue_time %d\n",
5720                                        tsb->tsa.iostat.queue_time);
5721                         len += sprintf(page + len, PRINTK_HEADER
5722                                " tsb->tsa.iostat.dev_busy_time %d\n",
5723                                        tsb->tsa.iostat.dev_busy_time);
5724                         len += sprintf(page + len, PRINTK_HEADER
5725                                " tsb->tsa.iostat.dev_act_time %d\n",
5726                                        tsb->tsa.iostat.dev_act_time);
5727                         sense = tsb->tsa.iostat.sense;
5728                         break;
5729                 case 2: /* ts_ddpc */
5730                         len += sprintf(page + len, PRINTK_HEADER
5731                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5732                         for (sl = 0; sl < 2; sl++) {
5733                                 len += sprintf(page + len, PRINTK_HEADER
5734                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
5735                                                (8 * sl), ((8 * sl) + 7));
5736                                 rcq = tsb->tsa.ddpc.rcq;
5737                                 for (sct = 0; sct < 8; sct++) {
5738                                         len += sprintf(page + len, " %02x",
5739                                                        rcq[8 * sl + sct]);
5740                                 }
5741                                 len += sprintf(page + len, "\n");
5742                         }
5743                         sense = tsb->tsa.ddpc.sense;
5744                         break;
5745                 case 3: /* tsa_intrg */
5746                         len += sprintf(page + len, PRINTK_HEADER
5747                                       " tsb->tsa.intrg.: not supported yet\n");
5748                         break;
5749                 }
5750
5751                 if (sense) {
5752                         for (sl = 0; sl < 4; sl++) {
5753                                 len += sprintf(page + len, PRINTK_HEADER
5754                                                " Sense(hex) %2d-%2d:",
5755                                                (8 * sl), ((8 * sl) + 7));
5756                                 for (sct = 0; sct < 8; sct++) {
5757                                         len += sprintf(page + len, " %02x",
5758                                                        sense[8 * sl + sct]);
5759                                 }
5760                                 len += sprintf(page + len, "\n");
5761                         }
5762
5763                         if (sense[27] & DASD_SENSE_BIT_0) {
5764                                 /* 24 Byte Sense Data */
5765                                 sprintf(page + len, PRINTK_HEADER
5766                                         " 24 Byte: %x MSG %x, "
5767                                         "%s MSGb to SYSOP\n",
5768                                         sense[7] >> 4, sense[7] & 0x0f,
5769                                         sense[1] & 0x10 ? "" : "no");
5770                         } else {
5771                                 /* 32 Byte Sense Data */
5772                                 sprintf(page + len, PRINTK_HEADER
5773                                         " 32 Byte: Format: %x "
5774                                         "Exception class %x\n",
5775                                         sense[6] & 0x0f, sense[22] >> 4);
5776                         }
5777                 } else {
5778                         sprintf(page + len, PRINTK_HEADER
5779                                 " SORRY - NO VALID SENSE AVAILABLE\n");
5780                 }
5781         } else {
5782                 sprintf(page + len, PRINTK_HEADER
5783                         " SORRY - NO TSB DATA AVAILABLE\n");
5784         }
5785         printk(KERN_ERR "%s", page);
5786         free_page((unsigned long) page);
5787 }
5788
5789 static void dasd_eckd_dump_sense(struct dasd_device *device,
5790                                  struct dasd_ccw_req *req, struct irb *irb)
5791 {
5792         u8 *sense = dasd_get_sense(irb);
5793
5794         if (scsw_is_tm(&irb->scsw)) {
5795                 /*
5796                  * In some cases the 'File Protected' or 'Incorrect Length'
5797                  * error might be expected and log messages shouldn't be written
5798                  * then. Check if the according suppress bit is set.
5799                  */
5800                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5801                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5802                         return;
5803                 if (scsw_cstat(&irb->scsw) == 0x40 &&
5804                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5805                         return;
5806
5807                 dasd_eckd_dump_sense_tcw(device, req, irb);
5808         } else {
5809                 /*
5810                  * In some cases the 'Command Reject' or 'No Record Found'
5811                  * error might be expected and log messages shouldn't be
5812                  * written then. Check if the according suppress bit is set.
5813                  */
5814                 if (sense && sense[0] & SNS0_CMD_REJECT &&
5815                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5816                         return;
5817
5818                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5819                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5820                         return;
5821
5822                 dasd_eckd_dump_sense_ccw(device, req, irb);
5823         }
5824 }
5825
5826 static int dasd_eckd_reload_device(struct dasd_device *device)
5827 {
5828         struct dasd_eckd_private *private = device->private;
5829         int rc, old_base;
5830         char print_uid[60];
5831         struct dasd_uid uid;
5832         unsigned long flags;
5833
5834         /*
5835          * remove device from alias handling to prevent new requests
5836          * from being scheduled on the wrong alias device
5837          */
5838         dasd_alias_remove_device(device);
5839
5840         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5841         old_base = private->uid.base_unit_addr;
5842         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5843
5844         /* Read Configuration Data */
5845         rc = dasd_eckd_read_conf(device);
5846         if (rc)
5847                 goto out_err;
5848
5849         dasd_eckd_read_fc_security(device);
5850
5851         rc = dasd_eckd_generate_uid(device);
5852         if (rc)
5853                 goto out_err;
5854         /*
5855          * update unit address configuration and
5856          * add device to alias management
5857          */
5858         dasd_alias_update_add_device(device);
5859
5860         dasd_eckd_get_uid(device, &uid);
5861
5862         if (old_base != uid.base_unit_addr) {
5863                 dasd_eckd_get_uid_string(&private->conf, print_uid);
5864                 dev_info(&device->cdev->dev,
5865                          "An Alias device was reassigned to a new base device "
5866                          "with UID: %s\n", print_uid);
5867         }
5868         return 0;
5869
5870 out_err:
5871         return -1;
5872 }
5873
5874 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5875                                          struct dasd_rssd_messages *messages,
5876                                          __u8 lpum)
5877 {
5878         struct dasd_rssd_messages *message_buf;
5879         struct dasd_psf_prssd_data *prssdp;
5880         struct dasd_ccw_req *cqr;
5881         struct ccw1 *ccw;
5882         int rc;
5883
5884         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5885                                    (sizeof(struct dasd_psf_prssd_data) +
5886                                     sizeof(struct dasd_rssd_messages)),
5887                                    device, NULL);
5888         if (IS_ERR(cqr)) {
5889                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5890                                 "Could not allocate read message buffer request");
5891                 return PTR_ERR(cqr);
5892         }
5893
5894         cqr->lpm = lpum;
5895 retry:
5896         cqr->startdev = device;
5897         cqr->memdev = device;
5898         cqr->block = NULL;
5899         cqr->expires = 10 * HZ;
5900         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5901         /* dasd_sleep_on_immediatly does not do complex error
5902          * recovery so clear erp flag and set retry counter to
5903          * do basic erp */
5904         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5905         cqr->retries = 256;
5906
5907         /* Prepare for Read Subsystem Data */
5908         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5909         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5910         prssdp->order = PSF_ORDER_PRSSD;
5911         prssdp->suborder = 0x03;        /* Message Buffer */
5912         /* all other bytes of prssdp must be zero */
5913
5914         ccw = cqr->cpaddr;
5915         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5916         ccw->count = sizeof(struct dasd_psf_prssd_data);
5917         ccw->flags |= CCW_FLAG_CC;
5918         ccw->flags |= CCW_FLAG_SLI;
5919         ccw->cda = (__u32)virt_to_phys(prssdp);
5920
5921         /* Read Subsystem Data - message buffer */
5922         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5923         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5924
5925         ccw++;
5926         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5927         ccw->count = sizeof(struct dasd_rssd_messages);
5928         ccw->flags |= CCW_FLAG_SLI;
5929         ccw->cda = (__u32)virt_to_phys(message_buf);
5930
5931         cqr->buildclk = get_tod_clock();
5932         cqr->status = DASD_CQR_FILLED;
5933         rc = dasd_sleep_on_immediatly(cqr);
5934         if (rc == 0) {
5935                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5936                 message_buf = (struct dasd_rssd_messages *)
5937                         (prssdp + 1);
5938                 memcpy(messages, message_buf,
5939                        sizeof(struct dasd_rssd_messages));
5940         } else if (cqr->lpm) {
5941                 /*
5942                  * on z/VM we might not be able to do I/O on the requested path
5943                  * but instead we get the required information on any path
5944                  * so retry with open path mask
5945                  */
5946                 cqr->lpm = 0;
5947                 goto retry;
5948         } else
5949                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5950                                 "Reading messages failed with rc=%d\n"
5951                                 , rc);
5952         dasd_sfree_request(cqr, cqr->memdev);
5953         return rc;
5954 }
5955
5956 static int dasd_eckd_query_host_access(struct dasd_device *device,
5957                                        struct dasd_psf_query_host_access *data)
5958 {
5959         struct dasd_eckd_private *private = device->private;
5960         struct dasd_psf_query_host_access *host_access;
5961         struct dasd_psf_prssd_data *prssdp;
5962         struct dasd_ccw_req *cqr;
5963         struct ccw1 *ccw;
5964         int rc;
5965
5966         /* not available for HYPER PAV alias devices */
5967         if (!device->block && private->lcu->pav == HYPER_PAV)
5968                 return -EOPNOTSUPP;
5969
5970         /* may not be supported by the storage server */
5971         if (!(private->features.feature[14] & 0x80))
5972                 return -EOPNOTSUPP;
5973
5974         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5975                                    sizeof(struct dasd_psf_prssd_data) + 1,
5976                                    device, NULL);
5977         if (IS_ERR(cqr)) {
5978                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5979                                 "Could not allocate read message buffer request");
5980                 return PTR_ERR(cqr);
5981         }
5982         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5983         if (!host_access) {
5984                 dasd_sfree_request(cqr, device);
5985                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5986                                 "Could not allocate host_access buffer");
5987                 return -ENOMEM;
5988         }
5989         cqr->startdev = device;
5990         cqr->memdev = device;
5991         cqr->block = NULL;
5992         cqr->retries = 256;
5993         cqr->expires = 10 * HZ;
5994
5995         /* Prepare for Read Subsystem Data */
5996         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5997         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5998         prssdp->order = PSF_ORDER_PRSSD;
5999         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
6000         /* LSS and Volume that will be queried */
6001         prssdp->lss = private->conf.ned->ID;
6002         prssdp->volume = private->conf.ned->unit_addr;
6003         /* all other bytes of prssdp must be zero */
6004
6005         ccw = cqr->cpaddr;
6006         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6007         ccw->count = sizeof(struct dasd_psf_prssd_data);
6008         ccw->flags |= CCW_FLAG_CC;
6009         ccw->flags |= CCW_FLAG_SLI;
6010         ccw->cda = (__u32)virt_to_phys(prssdp);
6011
6012         /* Read Subsystem Data - query host access */
6013         ccw++;
6014         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6015         ccw->count = sizeof(struct dasd_psf_query_host_access);
6016         ccw->flags |= CCW_FLAG_SLI;
6017         ccw->cda = (__u32)virt_to_phys(host_access);
6018
6019         cqr->buildclk = get_tod_clock();
6020         cqr->status = DASD_CQR_FILLED;
6021         /* the command might not be supported, suppress error message */
6022         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
6023         rc = dasd_sleep_on_interruptible(cqr);
6024         if (rc == 0) {
6025                 *data = *host_access;
6026         } else {
6027                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6028                                 "Reading host access data failed with rc=%d\n",
6029                                 rc);
6030                 rc = -EOPNOTSUPP;
6031         }
6032
6033         dasd_sfree_request(cqr, cqr->memdev);
6034         kfree(host_access);
6035         return rc;
6036 }
6037 /*
6038  * return number of grouped devices
6039  */
6040 static int dasd_eckd_host_access_count(struct dasd_device *device)
6041 {
6042         struct dasd_psf_query_host_access *access;
6043         struct dasd_ckd_path_group_entry *entry;
6044         struct dasd_ckd_host_information *info;
6045         int count = 0;
6046         int rc, i;
6047
6048         access = kzalloc(sizeof(*access), GFP_NOIO);
6049         if (!access) {
6050                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6051                                 "Could not allocate access buffer");
6052                 return -ENOMEM;
6053         }
6054         rc = dasd_eckd_query_host_access(device, access);
6055         if (rc) {
6056                 kfree(access);
6057                 return rc;
6058         }
6059
6060         info = (struct dasd_ckd_host_information *)
6061                 access->host_access_information;
6062         for (i = 0; i < info->entry_count; i++) {
6063                 entry = (struct dasd_ckd_path_group_entry *)
6064                         (info->entry + i * info->entry_size);
6065                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6066                         count++;
6067         }
6068
6069         kfree(access);
6070         return count;
6071 }
6072
6073 /*
6074  * write host access information to a sequential file
6075  */
6076 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6077 {
6078         struct dasd_psf_query_host_access *access;
6079         struct dasd_ckd_path_group_entry *entry;
6080         struct dasd_ckd_host_information *info;
6081         char sysplex[9] = "";
6082         int rc, i;
6083
6084         access = kzalloc(sizeof(*access), GFP_NOIO);
6085         if (!access) {
6086                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6087                                 "Could not allocate access buffer");
6088                 return -ENOMEM;
6089         }
6090         rc = dasd_eckd_query_host_access(device, access);
6091         if (rc) {
6092                 kfree(access);
6093                 return rc;
6094         }
6095
6096         info = (struct dasd_ckd_host_information *)
6097                 access->host_access_information;
6098         for (i = 0; i < info->entry_count; i++) {
6099                 entry = (struct dasd_ckd_path_group_entry *)
6100                         (info->entry + i * info->entry_size);
6101                 /* PGID */
6102                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6103                 /* FLAGS */
6104                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6105                 /* SYSPLEX NAME */
6106                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6107                 EBCASC(sysplex, sizeof(sysplex));
6108                 seq_printf(m, "sysplex_name %8s\n", sysplex);
6109                 /* SUPPORTED CYLINDER */
6110                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6111                 /* TIMESTAMP */
6112                 seq_printf(m, "timestamp %lu\n", (unsigned long)
6113                            entry->timestamp);
6114         }
6115         kfree(access);
6116
6117         return 0;
6118 }
6119
6120 static struct dasd_device
6121 *copy_relation_find_device(struct dasd_copy_relation *copy,
6122                            char *busid)
6123 {
6124         int i;
6125
6126         for (i = 0; i < DASD_CP_ENTRIES; i++) {
6127                 if (copy->entry[i].configured &&
6128                     strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
6129                         return copy->entry[i].device;
6130         }
6131         return NULL;
6132 }
6133
6134 /*
6135  * set the new active/primary device
6136  */
6137 static void copy_pair_set_active(struct dasd_copy_relation *copy, char *new_busid,
6138                                  char *old_busid)
6139 {
6140         int i;
6141
6142         for (i = 0; i < DASD_CP_ENTRIES; i++) {
6143                 if (copy->entry[i].configured &&
6144                     strncmp(copy->entry[i].busid, new_busid,
6145                             DASD_BUS_ID_SIZE) == 0) {
6146                         copy->active = &copy->entry[i];
6147                         copy->entry[i].primary = true;
6148                 } else if (copy->entry[i].configured &&
6149                            strncmp(copy->entry[i].busid, old_busid,
6150                                    DASD_BUS_ID_SIZE) == 0) {
6151                         copy->entry[i].primary = false;
6152                 }
6153         }
6154 }
6155
6156 /*
6157  * The function will swap the role of a given copy pair.
6158  * During the swap operation the relation of the blockdevice is disconnected
6159  * from the old primary and connected to the new.
6160  *
6161  * IO is paused on the block queue before swap and may be resumed afterwards.
6162  */
6163 static int dasd_eckd_copy_pair_swap(struct dasd_device *device, char *prim_busid,
6164                                     char *sec_busid)
6165 {
6166         struct dasd_device *primary, *secondary;
6167         struct dasd_copy_relation *copy;
6168         struct dasd_block *block;
6169         struct gendisk *gdp;
6170
6171         copy = device->copy;
6172         if (!copy)
6173                 return DASD_COPYPAIRSWAP_INVALID;
6174         primary = copy->active->device;
6175         if (!primary)
6176                 return DASD_COPYPAIRSWAP_INVALID;
6177         /* double check if swap has correct primary */
6178         if (strncmp(dev_name(&primary->cdev->dev), prim_busid, DASD_BUS_ID_SIZE) != 0)
6179                 return DASD_COPYPAIRSWAP_PRIMARY;
6180
6181         secondary = copy_relation_find_device(copy, sec_busid);
6182         if (!secondary)
6183                 return DASD_COPYPAIRSWAP_SECONDARY;
6184
6185         /*
6186          * usually the device should be quiesced for swap
6187          * for paranoia stop device and requeue requests again
6188          */
6189         dasd_device_set_stop_bits(primary, DASD_STOPPED_PPRC);
6190         dasd_device_set_stop_bits(secondary, DASD_STOPPED_PPRC);
6191         dasd_generic_requeue_all_requests(primary);
6192
6193         /* swap DASD internal device <> block assignment */
6194         block = primary->block;
6195         primary->block = NULL;
6196         secondary->block = block;
6197         block->base = secondary;
6198         /* set new primary device in COPY relation */
6199         copy_pair_set_active(copy, sec_busid, prim_busid);
6200
6201         /* swap blocklayer device link */
6202         gdp = block->gdp;
6203         dasd_add_link_to_gendisk(gdp, secondary);
6204
6205         /* re-enable device */
6206         dasd_device_remove_stop_bits(primary, DASD_STOPPED_PPRC);
6207         dasd_device_remove_stop_bits(secondary, DASD_STOPPED_PPRC);
6208         dasd_schedule_device_bh(secondary);
6209
6210         return DASD_COPYPAIRSWAP_SUCCESS;
6211 }
6212
6213 /*
6214  * Perform Subsystem Function - Peer-to-Peer Remote Copy Extended Query
6215  */
6216 static int dasd_eckd_query_pprc_status(struct dasd_device *device,
6217                                        struct dasd_pprc_data_sc4 *data)
6218 {
6219         struct dasd_pprc_data_sc4 *pprc_data;
6220         struct dasd_psf_prssd_data *prssdp;
6221         struct dasd_ccw_req *cqr;
6222         struct ccw1 *ccw;
6223         int rc;
6224
6225         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
6226                                    sizeof(*prssdp) + sizeof(*pprc_data) + 1,
6227                                    device, NULL);
6228         if (IS_ERR(cqr)) {
6229                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6230                                 "Could not allocate query PPRC status request");
6231                 return PTR_ERR(cqr);
6232         }
6233         cqr->startdev = device;
6234         cqr->memdev = device;
6235         cqr->block = NULL;
6236         cqr->retries = 256;
6237         cqr->expires = 10 * HZ;
6238
6239         /* Prepare for Read Subsystem Data */
6240         prssdp = (struct dasd_psf_prssd_data *)cqr->data;
6241         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
6242         prssdp->order = PSF_ORDER_PRSSD;
6243         prssdp->suborder = PSF_SUBORDER_PPRCEQ;
6244         prssdp->varies[0] = PPRCEQ_SCOPE_4;
6245         pprc_data = (struct dasd_pprc_data_sc4 *)(prssdp + 1);
6246
6247         ccw = cqr->cpaddr;
6248         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6249         ccw->count = sizeof(struct dasd_psf_prssd_data);
6250         ccw->flags |= CCW_FLAG_CC;
6251         ccw->flags |= CCW_FLAG_SLI;
6252         ccw->cda = (__u32)(addr_t)prssdp;
6253
6254         /* Read Subsystem Data - query host access */
6255         ccw++;
6256         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6257         ccw->count = sizeof(*pprc_data);
6258         ccw->flags |= CCW_FLAG_SLI;
6259         ccw->cda = (__u32)(addr_t)pprc_data;
6260
6261         cqr->buildclk = get_tod_clock();
6262         cqr->status = DASD_CQR_FILLED;
6263
6264         rc = dasd_sleep_on_interruptible(cqr);
6265         if (rc == 0) {
6266                 *data = *pprc_data;
6267         } else {
6268                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6269                                 "PPRC Extended Query failed with rc=%d\n",
6270                                 rc);
6271                 rc = -EOPNOTSUPP;
6272         }
6273
6274         dasd_sfree_request(cqr, cqr->memdev);
6275         return rc;
6276 }
6277
6278 /*
6279  * ECKD NOP - no operation
6280  */
6281 static int dasd_eckd_nop(struct dasd_device *device)
6282 {
6283         struct dasd_ccw_req *cqr;
6284         struct ccw1 *ccw;
6285         int rc;
6286
6287         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 1, device, NULL);
6288         if (IS_ERR(cqr)) {
6289                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6290                                 "Could not allocate NOP request");
6291                 return PTR_ERR(cqr);
6292         }
6293         cqr->startdev = device;
6294         cqr->memdev = device;
6295         cqr->block = NULL;
6296         cqr->retries = 1;
6297         cqr->expires = 10 * HZ;
6298
6299         ccw = cqr->cpaddr;
6300         ccw->cmd_code = DASD_ECKD_CCW_NOP;
6301         ccw->flags |= CCW_FLAG_SLI;
6302
6303         cqr->buildclk = get_tod_clock();
6304         cqr->status = DASD_CQR_FILLED;
6305
6306         rc = dasd_sleep_on_interruptible(cqr);
6307         if (rc != 0) {
6308                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6309                                 "NOP failed with rc=%d\n", rc);
6310                 rc = -EOPNOTSUPP;
6311         }
6312         dasd_sfree_request(cqr, cqr->memdev);
6313         return rc;
6314 }
6315
6316 static int dasd_eckd_device_ping(struct dasd_device *device)
6317 {
6318         return dasd_eckd_nop(device);
6319 }
6320
6321 /*
6322  * Perform Subsystem Function - CUIR response
6323  */
6324 static int
6325 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6326                             __u32 message_id, __u8 lpum)
6327 {
6328         struct dasd_psf_cuir_response *psf_cuir;
6329         int pos = pathmask_to_pos(lpum);
6330         struct dasd_ccw_req *cqr;
6331         struct ccw1 *ccw;
6332         int rc;
6333
6334         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6335                                    sizeof(struct dasd_psf_cuir_response),
6336                                    device, NULL);
6337
6338         if (IS_ERR(cqr)) {
6339                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6340                            "Could not allocate PSF-CUIR request");
6341                 return PTR_ERR(cqr);
6342         }
6343
6344         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6345         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6346         psf_cuir->cc = response;
6347         psf_cuir->chpid = device->path[pos].chpid;
6348         psf_cuir->message_id = message_id;
6349         psf_cuir->cssid = device->path[pos].cssid;
6350         psf_cuir->ssid = device->path[pos].ssid;
6351         ccw = cqr->cpaddr;
6352         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6353         ccw->cda = (__u32)virt_to_phys(psf_cuir);
6354         ccw->flags = CCW_FLAG_SLI;
6355         ccw->count = sizeof(struct dasd_psf_cuir_response);
6356
6357         cqr->startdev = device;
6358         cqr->memdev = device;
6359         cqr->block = NULL;
6360         cqr->retries = 256;
6361         cqr->expires = 10*HZ;
6362         cqr->buildclk = get_tod_clock();
6363         cqr->status = DASD_CQR_FILLED;
6364         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6365
6366         rc = dasd_sleep_on(cqr);
6367
6368         dasd_sfree_request(cqr, cqr->memdev);
6369         return rc;
6370 }
6371
6372 /*
6373  * return configuration data that is referenced by record selector
6374  * if a record selector is specified or per default return the
6375  * conf_data pointer for the path specified by lpum
6376  */
6377 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6378                                                      __u8 lpum,
6379                                                      struct dasd_cuir_message *cuir)
6380 {
6381         struct dasd_conf_data *conf_data;
6382         int path, pos;
6383
6384         if (cuir->record_selector == 0)
6385                 goto out;
6386         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6387                 conf_data = device->path[pos].conf_data;
6388                 if (conf_data->gneq.record_selector ==
6389                     cuir->record_selector)
6390                         return conf_data;
6391         }
6392 out:
6393         return device->path[pathmask_to_pos(lpum)].conf_data;
6394 }
6395
6396 /*
6397  * This function determines the scope of a reconfiguration request by
6398  * analysing the path and device selection data provided in the CUIR request.
6399  * Returns a path mask containing CUIR affected paths for the give device.
6400  *
6401  * If the CUIR request does not contain the required information return the
6402  * path mask of the path the attention message for the CUIR request was reveived
6403  * on.
6404  */
6405 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6406                                 struct dasd_cuir_message *cuir)
6407 {
6408         struct dasd_conf_data *ref_conf_data;
6409         unsigned long bitmask = 0, mask = 0;
6410         struct dasd_conf_data *conf_data;
6411         unsigned int pos, path;
6412         char *ref_gneq, *gneq;
6413         char *ref_ned, *ned;
6414         int tbcpm = 0;
6415
6416         /* if CUIR request does not specify the scope use the path
6417            the attention message was presented on */
6418         if (!cuir->ned_map ||
6419             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6420                 return lpum;
6421
6422         /* get reference conf data */
6423         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6424         /* reference ned is determined by ned_map field */
6425         pos = 8 - ffs(cuir->ned_map);
6426         ref_ned = (char *)&ref_conf_data->neds[pos];
6427         ref_gneq = (char *)&ref_conf_data->gneq;
6428         /* transfer 24 bit neq_map to mask */
6429         mask = cuir->neq_map[2];
6430         mask |= cuir->neq_map[1] << 8;
6431         mask |= cuir->neq_map[0] << 16;
6432
6433         for (path = 0; path < 8; path++) {
6434                 /* initialise data per path */
6435                 bitmask = mask;
6436                 conf_data = device->path[path].conf_data;
6437                 pos = 8 - ffs(cuir->ned_map);
6438                 ned = (char *) &conf_data->neds[pos];
6439                 /* compare reference ned and per path ned */
6440                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6441                         continue;
6442                 gneq = (char *)&conf_data->gneq;
6443                 /* compare reference gneq and per_path gneq under
6444                    24 bit mask where mask bit 0 equals byte 7 of
6445                    the gneq and mask bit 24 equals byte 31 */
6446                 while (bitmask) {
6447                         pos = ffs(bitmask) - 1;
6448                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6449                             != 0)
6450                                 break;
6451                         clear_bit(pos, &bitmask);
6452                 }
6453                 if (bitmask)
6454                         continue;
6455                 /* device and path match the reference values
6456                    add path to CUIR scope */
6457                 tbcpm |= 0x80 >> path;
6458         }
6459         return tbcpm;
6460 }
6461
6462 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6463                                        unsigned long paths, int action)
6464 {
6465         int pos;
6466
6467         while (paths) {
6468                 /* get position of bit in mask */
6469                 pos = 8 - ffs(paths);
6470                 /* get channel path descriptor from this position */
6471                 if (action == CUIR_QUIESCE)
6472                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
6473                                 device->path[pos].cssid,
6474                                 device->path[pos].chpid);
6475                 else if (action == CUIR_RESUME)
6476                         pr_info("Path %x.%02x is back online after service on the storage server",
6477                                 device->path[pos].cssid,
6478                                 device->path[pos].chpid);
6479                 clear_bit(7 - pos, &paths);
6480         }
6481 }
6482
6483 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6484                                       struct dasd_cuir_message *cuir)
6485 {
6486         unsigned long tbcpm;
6487
6488         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6489         /* nothing to do if path is not in use */
6490         if (!(dasd_path_get_opm(device) & tbcpm))
6491                 return 0;
6492         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6493                 /* no path would be left if the CUIR action is taken
6494                    return error */
6495                 return -EINVAL;
6496         }
6497         /* remove device from operational path mask */
6498         dasd_path_remove_opm(device, tbcpm);
6499         dasd_path_add_cuirpm(device, tbcpm);
6500         return tbcpm;
6501 }
6502
6503 /*
6504  * walk through all devices and build a path mask to quiesce them
6505  * return an error if the last path to a device would be removed
6506  *
6507  * if only part of the devices are quiesced and an error
6508  * occurs no onlining necessary, the storage server will
6509  * notify the already set offline devices again
6510  */
6511 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6512                                   struct dasd_cuir_message *cuir)
6513 {
6514         struct dasd_eckd_private *private = device->private;
6515         struct alias_pav_group *pavgroup, *tempgroup;
6516         struct dasd_device *dev, *n;
6517         unsigned long paths = 0;
6518         unsigned long flags;
6519         int tbcpm;
6520
6521         /* active devices */
6522         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6523                                  alias_list) {
6524                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6525                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6526                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6527                 if (tbcpm < 0)
6528                         goto out_err;
6529                 paths |= tbcpm;
6530         }
6531         /* inactive devices */
6532         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6533                                  alias_list) {
6534                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6535                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6536                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6537                 if (tbcpm < 0)
6538                         goto out_err;
6539                 paths |= tbcpm;
6540         }
6541         /* devices in PAV groups */
6542         list_for_each_entry_safe(pavgroup, tempgroup,
6543                                  &private->lcu->grouplist, group) {
6544                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6545                                          alias_list) {
6546                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6547                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6548                         spin_unlock_irqrestore(
6549                                 get_ccwdev_lock(dev->cdev), flags);
6550                         if (tbcpm < 0)
6551                                 goto out_err;
6552                         paths |= tbcpm;
6553                 }
6554                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6555                                          alias_list) {
6556                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6557                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6558                         spin_unlock_irqrestore(
6559                                 get_ccwdev_lock(dev->cdev), flags);
6560                         if (tbcpm < 0)
6561                                 goto out_err;
6562                         paths |= tbcpm;
6563                 }
6564         }
6565         /* notify user about all paths affected by CUIR action */
6566         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6567         return 0;
6568 out_err:
6569         return tbcpm;
6570 }
6571
6572 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6573                                  struct dasd_cuir_message *cuir)
6574 {
6575         struct dasd_eckd_private *private = device->private;
6576         struct alias_pav_group *pavgroup, *tempgroup;
6577         struct dasd_device *dev, *n;
6578         unsigned long paths = 0;
6579         int tbcpm;
6580
6581         /*
6582          * the path may have been added through a generic path event before
6583          * only trigger path verification if the path is not already in use
6584          */
6585         list_for_each_entry_safe(dev, n,
6586                                  &private->lcu->active_devices,
6587                                  alias_list) {
6588                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6589                 paths |= tbcpm;
6590                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6591                         dasd_path_add_tbvpm(dev, tbcpm);
6592                         dasd_schedule_device_bh(dev);
6593                 }
6594         }
6595         list_for_each_entry_safe(dev, n,
6596                                  &private->lcu->inactive_devices,
6597                                  alias_list) {
6598                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6599                 paths |= tbcpm;
6600                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6601                         dasd_path_add_tbvpm(dev, tbcpm);
6602                         dasd_schedule_device_bh(dev);
6603                 }
6604         }
6605         /* devices in PAV groups */
6606         list_for_each_entry_safe(pavgroup, tempgroup,
6607                                  &private->lcu->grouplist,
6608                                  group) {
6609                 list_for_each_entry_safe(dev, n,
6610                                          &pavgroup->baselist,
6611                                          alias_list) {
6612                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6613                         paths |= tbcpm;
6614                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6615                                 dasd_path_add_tbvpm(dev, tbcpm);
6616                                 dasd_schedule_device_bh(dev);
6617                         }
6618                 }
6619                 list_for_each_entry_safe(dev, n,
6620                                          &pavgroup->aliaslist,
6621                                          alias_list) {
6622                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6623                         paths |= tbcpm;
6624                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6625                                 dasd_path_add_tbvpm(dev, tbcpm);
6626                                 dasd_schedule_device_bh(dev);
6627                         }
6628                 }
6629         }
6630         /* notify user about all paths affected by CUIR action */
6631         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6632         return 0;
6633 }
6634
6635 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6636                                  __u8 lpum)
6637 {
6638         struct dasd_cuir_message *cuir = messages;
6639         int response;
6640
6641         DBF_DEV_EVENT(DBF_WARNING, device,
6642                       "CUIR request: %016llx %016llx %016llx %08x",
6643                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6644                       ((u32 *)cuir)[3]);
6645
6646         if (cuir->code == CUIR_QUIESCE) {
6647                 /* quiesce */
6648                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6649                         response = PSF_CUIR_LAST_PATH;
6650                 else
6651                         response = PSF_CUIR_COMPLETED;
6652         } else if (cuir->code == CUIR_RESUME) {
6653                 /* resume */
6654                 dasd_eckd_cuir_resume(device, lpum, cuir);
6655                 response = PSF_CUIR_COMPLETED;
6656         } else
6657                 response = PSF_CUIR_NOT_SUPPORTED;
6658
6659         dasd_eckd_psf_cuir_response(device, response,
6660                                     cuir->message_id, lpum);
6661         DBF_DEV_EVENT(DBF_WARNING, device,
6662                       "CUIR response: %d on message ID %08x", response,
6663                       cuir->message_id);
6664         /* to make sure there is no attention left schedule work again */
6665         device->discipline->check_attention(device, lpum);
6666 }
6667
6668 static void dasd_eckd_oos_resume(struct dasd_device *device)
6669 {
6670         struct dasd_eckd_private *private = device->private;
6671         struct alias_pav_group *pavgroup, *tempgroup;
6672         struct dasd_device *dev, *n;
6673         unsigned long flags;
6674
6675         spin_lock_irqsave(&private->lcu->lock, flags);
6676         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6677                                  alias_list) {
6678                 if (dev->stopped & DASD_STOPPED_NOSPC)
6679                         dasd_generic_space_avail(dev);
6680         }
6681         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6682                                  alias_list) {
6683                 if (dev->stopped & DASD_STOPPED_NOSPC)
6684                         dasd_generic_space_avail(dev);
6685         }
6686         /* devices in PAV groups */
6687         list_for_each_entry_safe(pavgroup, tempgroup,
6688                                  &private->lcu->grouplist,
6689                                  group) {
6690                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6691                                          alias_list) {
6692                         if (dev->stopped & DASD_STOPPED_NOSPC)
6693                                 dasd_generic_space_avail(dev);
6694                 }
6695                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6696                                          alias_list) {
6697                         if (dev->stopped & DASD_STOPPED_NOSPC)
6698                                 dasd_generic_space_avail(dev);
6699                 }
6700         }
6701         spin_unlock_irqrestore(&private->lcu->lock, flags);
6702 }
6703
6704 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6705                                  __u8 lpum)
6706 {
6707         struct dasd_oos_message *oos = messages;
6708
6709         switch (oos->code) {
6710         case REPO_WARN:
6711         case POOL_WARN:
6712                 dev_warn(&device->cdev->dev,
6713                          "Extent pool usage has reached a critical value\n");
6714                 dasd_eckd_oos_resume(device);
6715                 break;
6716         case REPO_EXHAUST:
6717         case POOL_EXHAUST:
6718                 dev_warn(&device->cdev->dev,
6719                          "Extent pool is exhausted\n");
6720                 break;
6721         case REPO_RELIEVE:
6722         case POOL_RELIEVE:
6723                 dev_info(&device->cdev->dev,
6724                          "Extent pool physical space constraint has been relieved\n");
6725                 break;
6726         }
6727
6728         /* In any case, update related data */
6729         dasd_eckd_read_ext_pool_info(device);
6730
6731         /* to make sure there is no attention left schedule work again */
6732         device->discipline->check_attention(device, lpum);
6733 }
6734
6735 static void dasd_eckd_check_attention_work(struct work_struct *work)
6736 {
6737         struct check_attention_work_data *data;
6738         struct dasd_rssd_messages *messages;
6739         struct dasd_device *device;
6740         int rc;
6741
6742         data = container_of(work, struct check_attention_work_data, worker);
6743         device = data->device;
6744         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6745         if (!messages) {
6746                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6747                               "Could not allocate attention message buffer");
6748                 goto out;
6749         }
6750         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6751         if (rc)
6752                 goto out;
6753
6754         if (messages->length == ATTENTION_LENGTH_CUIR &&
6755             messages->format == ATTENTION_FORMAT_CUIR)
6756                 dasd_eckd_handle_cuir(device, messages, data->lpum);
6757         if (messages->length == ATTENTION_LENGTH_OOS &&
6758             messages->format == ATTENTION_FORMAT_OOS)
6759                 dasd_eckd_handle_oos(device, messages, data->lpum);
6760
6761 out:
6762         dasd_put_device(device);
6763         kfree(messages);
6764         kfree(data);
6765 }
6766
6767 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6768 {
6769         struct check_attention_work_data *data;
6770
6771         data = kzalloc(sizeof(*data), GFP_ATOMIC);
6772         if (!data)
6773                 return -ENOMEM;
6774         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6775         dasd_get_device(device);
6776         data->device = device;
6777         data->lpum = lpum;
6778         schedule_work(&data->worker);
6779         return 0;
6780 }
6781
6782 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6783 {
6784         if (~lpum & dasd_path_get_opm(device)) {
6785                 dasd_path_add_nohpfpm(device, lpum);
6786                 dasd_path_remove_opm(device, lpum);
6787                 dev_err(&device->cdev->dev,
6788                         "Channel path %02X lost HPF functionality and is disabled\n",
6789                         lpum);
6790                 return 1;
6791         }
6792         return 0;
6793 }
6794
6795 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6796 {
6797         struct dasd_eckd_private *private = device->private;
6798
6799         dev_err(&device->cdev->dev,
6800                 "High Performance FICON disabled\n");
6801         private->fcx_max_data = 0;
6802 }
6803
6804 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6805 {
6806         struct dasd_eckd_private *private = device->private;
6807
6808         return private->fcx_max_data ? 1 : 0;
6809 }
6810
6811 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6812                                        struct irb *irb)
6813 {
6814         struct dasd_eckd_private *private = device->private;
6815
6816         if (!private->fcx_max_data) {
6817                 /* sanity check for no HPF, the error makes no sense */
6818                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6819                               "Trying to disable HPF for a non HPF device");
6820                 return;
6821         }
6822         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6823                 dasd_eckd_disable_hpf_device(device);
6824         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6825                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6826                         return;
6827                 dasd_eckd_disable_hpf_device(device);
6828                 dasd_path_set_tbvpm(device,
6829                                   dasd_path_get_hpfpm(device));
6830         }
6831         /*
6832          * prevent that any new I/O ist started on the device and schedule a
6833          * requeue of existing requests
6834          */
6835         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6836         dasd_schedule_requeue(device);
6837 }
6838
6839 /*
6840  * Initialize block layer request queue.
6841  */
6842 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6843 {
6844         unsigned int logical_block_size = block->bp_block;
6845         struct request_queue *q = block->gdp->queue;
6846         struct dasd_device *device = block->base;
6847         int max;
6848
6849         if (device->features & DASD_FEATURE_USERAW) {
6850                 /*
6851                  * the max_blocks value for raw_track access is 256
6852                  * it is higher than the native ECKD value because we
6853                  * only need one ccw per track
6854                  * so the max_hw_sectors are
6855                  * 2048 x 512B = 1024kB = 16 tracks
6856                  */
6857                 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6858         } else {
6859                 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6860         }
6861         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6862         q->limits.max_dev_sectors = max;
6863         blk_queue_logical_block_size(q, logical_block_size);
6864         blk_queue_max_hw_sectors(q, max);
6865         blk_queue_max_segments(q, USHRT_MAX);
6866         /* With page sized segments each segment can be translated into one idaw/tidaw */
6867         blk_queue_max_segment_size(q, PAGE_SIZE);
6868         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6869         blk_queue_dma_alignment(q, PAGE_SIZE - 1);
6870 }
6871
6872 static struct ccw_driver dasd_eckd_driver = {
6873         .driver = {
6874                 .name   = "dasd-eckd",
6875                 .owner  = THIS_MODULE,
6876                 .dev_groups = dasd_dev_groups,
6877         },
6878         .ids         = dasd_eckd_ids,
6879         .probe       = dasd_eckd_probe,
6880         .remove      = dasd_generic_remove,
6881         .set_offline = dasd_generic_set_offline,
6882         .set_online  = dasd_eckd_set_online,
6883         .notify      = dasd_generic_notify,
6884         .path_event  = dasd_generic_path_event,
6885         .shutdown    = dasd_generic_shutdown,
6886         .uc_handler  = dasd_generic_uc_handler,
6887         .int_class   = IRQIO_DAS,
6888 };
6889
6890 static struct dasd_discipline dasd_eckd_discipline = {
6891         .owner = THIS_MODULE,
6892         .name = "ECKD",
6893         .ebcname = "ECKD",
6894         .check_device = dasd_eckd_check_characteristics,
6895         .uncheck_device = dasd_eckd_uncheck_device,
6896         .do_analysis = dasd_eckd_do_analysis,
6897         .pe_handler = dasd_eckd_pe_handler,
6898         .basic_to_ready = dasd_eckd_basic_to_ready,
6899         .online_to_ready = dasd_eckd_online_to_ready,
6900         .basic_to_known = dasd_eckd_basic_to_known,
6901         .setup_blk_queue = dasd_eckd_setup_blk_queue,
6902         .fill_geometry = dasd_eckd_fill_geometry,
6903         .start_IO = dasd_start_IO,
6904         .term_IO = dasd_term_IO,
6905         .handle_terminated_request = dasd_eckd_handle_terminated_request,
6906         .format_device = dasd_eckd_format_device,
6907         .check_device_format = dasd_eckd_check_device_format,
6908         .erp_action = dasd_eckd_erp_action,
6909         .erp_postaction = dasd_eckd_erp_postaction,
6910         .check_for_device_change = dasd_eckd_check_for_device_change,
6911         .build_cp = dasd_eckd_build_alias_cp,
6912         .free_cp = dasd_eckd_free_alias_cp,
6913         .dump_sense = dasd_eckd_dump_sense,
6914         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6915         .fill_info = dasd_eckd_fill_info,
6916         .ioctl = dasd_eckd_ioctl,
6917         .reload = dasd_eckd_reload_device,
6918         .get_uid = dasd_eckd_get_uid,
6919         .kick_validate = dasd_eckd_kick_validate_server,
6920         .check_attention = dasd_eckd_check_attention,
6921         .host_access_count = dasd_eckd_host_access_count,
6922         .hosts_print = dasd_hosts_print,
6923         .handle_hpf_error = dasd_eckd_handle_hpf_error,
6924         .disable_hpf = dasd_eckd_disable_hpf_device,
6925         .hpf_enabled = dasd_eckd_hpf_enabled,
6926         .reset_path = dasd_eckd_reset_path,
6927         .is_ese = dasd_eckd_is_ese,
6928         .space_allocated = dasd_eckd_space_allocated,
6929         .space_configured = dasd_eckd_space_configured,
6930         .logical_capacity = dasd_eckd_logical_capacity,
6931         .release_space = dasd_eckd_release_space,
6932         .ext_pool_id = dasd_eckd_ext_pool_id,
6933         .ext_size = dasd_eckd_ext_size,
6934         .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6935         .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6936         .ext_pool_oos = dasd_eckd_ext_pool_oos,
6937         .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6938         .ese_format = dasd_eckd_ese_format,
6939         .ese_read = dasd_eckd_ese_read,
6940         .pprc_status = dasd_eckd_query_pprc_status,
6941         .pprc_enabled = dasd_eckd_pprc_enabled,
6942         .copy_pair_swap = dasd_eckd_copy_pair_swap,
6943         .device_ping = dasd_eckd_device_ping,
6944 };
6945
6946 static int __init
6947 dasd_eckd_init(void)
6948 {
6949         int ret;
6950
6951         ASCEBC(dasd_eckd_discipline.ebcname, 4);
6952         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6953                                    GFP_KERNEL | GFP_DMA);
6954         if (!dasd_reserve_req)
6955                 return -ENOMEM;
6956         dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6957                                     GFP_KERNEL | GFP_DMA);
6958         if (!dasd_vol_info_req) {
6959                 kfree(dasd_reserve_req);
6960                 return -ENOMEM;
6961         }
6962         pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6963                                     GFP_KERNEL | GFP_DMA);
6964         if (!pe_handler_worker) {
6965                 kfree(dasd_reserve_req);
6966                 kfree(dasd_vol_info_req);
6967                 return -ENOMEM;
6968         }
6969         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6970         if (!rawpadpage) {
6971                 kfree(pe_handler_worker);
6972                 kfree(dasd_reserve_req);
6973                 kfree(dasd_vol_info_req);
6974                 return -ENOMEM;
6975         }
6976         ret = ccw_driver_register(&dasd_eckd_driver);
6977         if (!ret)
6978                 wait_for_device_probe();
6979         else {
6980                 kfree(pe_handler_worker);
6981                 kfree(dasd_reserve_req);
6982                 kfree(dasd_vol_info_req);
6983                 free_page((unsigned long)rawpadpage);
6984         }
6985         return ret;
6986 }
6987
6988 static void __exit
6989 dasd_eckd_cleanup(void)
6990 {
6991         ccw_driver_unregister(&dasd_eckd_driver);
6992         kfree(pe_handler_worker);
6993         kfree(dasd_reserve_req);
6994         free_page((unsigned long)rawpadpage);
6995 }
6996
6997 module_init(dasd_eckd_init);
6998 module_exit(dasd_eckd_cleanup);