drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   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  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  *
  12  */
  13
  14 #define KMSG_COMPONENT "dasd"
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  20 #include <linux/bio.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/todclk.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/cio.h>
  31 #include <asm/ccwdev.h>
  32 #include <asm/itcw.h>
  33
  34 #include "dasd_int.h"
  35 #include "dasd_eckd.h"
  36 #include "../cio/chsc.h"
  37
  38
  39 #ifdef PRINTK_HEADER
  40 #undef PRINTK_HEADER
  41 #endif                          /* PRINTK_HEADER */
  42 #define PRINTK_HEADER "dasd(eckd):"
  43
  44 #define ECKD_C0(i) (i->home_bytes)
  45 #define ECKD_F(i) (i->formula)
  46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  47                     (i->factors.f_0x02.f1))
  48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  49                     (i->factors.f_0x02.f2))
  50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  51                     (i->factors.f_0x02.f3))
  52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  54 #define ECKD_F6(i) (i->factor6)
  55 #define ECKD_F7(i) (i->factor7)
  56 #define ECKD_F8(i) (i->factor8)
  57
  58 MODULE_LICENSE("GPL");
  59
  60 static struct dasd_discipline dasd_eckd_discipline;
  61
  62 /* The ccw bus type uses this table to find devices that it sends to
  63  * dasd_eckd_probe */
  64 static struct ccw_device_id dasd_eckd_ids[] = {
  65         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  66         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  67         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  68         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  69         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  70         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  71         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  72         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  73         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  74         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  75         { /* end of list */ },
  76 };
  77
  78 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  79
  80 static struct ccw_driver dasd_eckd_driver; /* see below */
  81
  82 /* initial attempt at a probe function. this can be simplified once
  83  * the other detection code is gone */
  84 static int
  85 dasd_eckd_probe (struct ccw_device *cdev)
  86 {
  87         int ret;
  88
  89         /* set ECKD specific ccw-device options */
  90         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  91         if (ret) {
  92                 DBF_EVENT(DBF_WARNING,
  93                        "dasd_eckd_probe: could not set ccw-device options "
  94                        "for %s\n", dev_name(&cdev->dev));
  95                 return ret;
  96         }
  97         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  98         return ret;
  99 }
 100
 101 static int
 102 dasd_eckd_set_online(struct ccw_device *cdev)
 103 {
 104         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 105 }
 106
 107 static struct ccw_driver dasd_eckd_driver = {
 108         .name        = "dasd-eckd",
 109         .owner       = THIS_MODULE,
 110         .ids         = dasd_eckd_ids,
 111         .probe       = dasd_eckd_probe,
 112         .remove      = dasd_generic_remove,
 113         .set_offline = dasd_generic_set_offline,
 114         .set_online  = dasd_eckd_set_online,
 115         .notify      = dasd_generic_notify,
 116 };
 117
 118 static const int sizes_trk0[] = { 28, 148, 84 };
 119 #define LABEL_SIZE 140
 120
 121 static inline unsigned int
 122 round_up_multiple(unsigned int no, unsigned int mult)
 123 {
 124         int rem = no % mult;
 125         return (rem ? no - rem + mult : no);
 126 }
 127
 128 static inline unsigned int
 129 ceil_quot(unsigned int d1, unsigned int d2)
 130 {
 131         return (d1 + (d2 - 1)) / d2;
 132 }
 133
 134 static unsigned int
 135 recs_per_track(struct dasd_eckd_characteristics * rdc,
 136                unsigned int kl, unsigned int dl)
 137 {
 138         int dn, kn;
 139
 140         switch (rdc->dev_type) {
 141         case 0x3380:
 142                 if (kl)
 143                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 144                                        ceil_quot(dl + 12, 32));
 145                 else
 146                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 147         case 0x3390:
 148                 dn = ceil_quot(dl + 6, 232) + 1;
 149                 if (kl) {
 150                         kn = ceil_quot(kl + 6, 232) + 1;
 151                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 152                                        9 + ceil_quot(dl + 6 * dn, 34));
 153                 } else
 154                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 155         case 0x9345:
 156                 dn = ceil_quot(dl + 6, 232) + 1;
 157                 if (kl) {
 158                         kn = ceil_quot(kl + 6, 232) + 1;
 159                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 160                                        ceil_quot(dl + 6 * dn, 34));
 161                 } else
 162                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 163         }
 164         return 0;
 165 }
 166
 167 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 168 {
 169         geo->cyl = (__u16) cyl;
 170         geo->head = cyl >> 16;
 171         geo->head <<= 4;
 172         geo->head |= head;
 173 }
 174
 175 static int
 176 check_XRC (struct ccw1         *de_ccw,
 177            struct DE_eckd_data *data,
 178            struct dasd_device  *device)
 179 {
 180         struct dasd_eckd_private *private;
 181         int rc;
 182
 183         private = (struct dasd_eckd_private *) device->private;
 184         if (!private->rdc_data.facilities.XRC_supported)
 185                 return 0;
 186
 187         /* switch on System Time Stamp - needed for XRC Support */
 188         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 189         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 190
 191         rc = get_sync_clock(&data->ep_sys_time);
 192         /* Ignore return code if sync clock is switched off. */
 193         if (rc == -ENOSYS || rc == -EACCES)
 194                 rc = 0;
 195
 196         de_ccw->count = sizeof(struct DE_eckd_data);
 197         de_ccw->flags |= CCW_FLAG_SLI;
 198         return rc;
 199 }
 200
 201 static int
 202 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 203               unsigned int totrk, int cmd, struct dasd_device *device)
 204 {
 205         struct dasd_eckd_private *private;
 206         u32 begcyl, endcyl;
 207         u16 heads, beghead, endhead;
 208         int rc = 0;
 209
 210         private = (struct dasd_eckd_private *) device->private;
 211
 212         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 213         ccw->flags = 0;
 214         ccw->count = 16;
 215         ccw->cda = (__u32) __pa(data);
 216
 217         memset(data, 0, sizeof(struct DE_eckd_data));
 218         switch (cmd) {
 219         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 220         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 221         case DASD_ECKD_CCW_READ:
 222         case DASD_ECKD_CCW_READ_MT:
 223         case DASD_ECKD_CCW_READ_CKD:
 224         case DASD_ECKD_CCW_READ_CKD_MT:
 225         case DASD_ECKD_CCW_READ_KD:
 226         case DASD_ECKD_CCW_READ_KD_MT:
 227         case DASD_ECKD_CCW_READ_COUNT:
 228                 data->mask.perm = 0x1;
 229                 data->attributes.operation = private->attrib.operation;
 230                 break;
 231         case DASD_ECKD_CCW_WRITE:
 232         case DASD_ECKD_CCW_WRITE_MT:
 233         case DASD_ECKD_CCW_WRITE_KD:
 234         case DASD_ECKD_CCW_WRITE_KD_MT:
 235                 data->mask.perm = 0x02;
 236                 data->attributes.operation = private->attrib.operation;
 237                 rc = check_XRC (ccw, data, device);
 238                 break;
 239         case DASD_ECKD_CCW_WRITE_CKD:
 240         case DASD_ECKD_CCW_WRITE_CKD_MT:
 241                 data->attributes.operation = DASD_BYPASS_CACHE;
 242                 rc = check_XRC (ccw, data, device);
 243                 break;
 244         case DASD_ECKD_CCW_ERASE:
 245         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 246         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 247                 data->mask.perm = 0x3;
 248                 data->mask.auth = 0x1;
 249                 data->attributes.operation = DASD_BYPASS_CACHE;
 250                 rc = check_XRC (ccw, data, device);
 251                 break;
 252         default:
 253                 dev_err(&device->cdev->dev,
 254                         "0x%x is not a known command\n", cmd);
 255                 break;
 256         }
 257
 258         data->attributes.mode = 0x3;    /* ECKD */
 259
 260         if ((private->rdc_data.cu_type == 0x2105 ||
 261              private->rdc_data.cu_type == 0x2107 ||
 262              private->rdc_data.cu_type == 0x1750)
 263             && !(private->uses_cdl && trk < 2))
 264                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 265
 266         heads = private->rdc_data.trk_per_cyl;
 267         begcyl = trk / heads;
 268         beghead = trk % heads;
 269         endcyl = totrk / heads;
 270         endhead = totrk % heads;
 271
 272         /* check for sequential prestage - enhance cylinder range */
 273         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 274             data->attributes.operation == DASD_SEQ_ACCESS) {
 275
 276                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 277                         endcyl += private->attrib.nr_cyl;
 278                 else
 279                         endcyl = (private->real_cyl - 1);
 280         }
 281
 282         set_ch_t(&data->beg_ext, begcyl, beghead);
 283         set_ch_t(&data->end_ext, endcyl, endhead);
 284         return rc;
 285 }
 286
 287 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 288                                struct dasd_device  *device)
 289 {
 290         struct dasd_eckd_private *private;
 291         int rc;
 292
 293         private = (struct dasd_eckd_private *) device->private;
 294         if (!private->rdc_data.facilities.XRC_supported)
 295                 return 0;
 296
 297         /* switch on System Time Stamp - needed for XRC Support */
 298         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 299         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 300         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 301
 302         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 303         /* Ignore return code if sync clock is switched off. */
 304         if (rc == -ENOSYS || rc == -EACCES)
 305                 rc = 0;
 306         return rc;
 307 }
 308
 309 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 310                           unsigned int rec_on_trk, int count, int cmd,
 311                           struct dasd_device *device, unsigned int reclen,
 312                           unsigned int tlf)
 313 {
 314         struct dasd_eckd_private *private;
 315         int sector;
 316         int dn, d;
 317
 318         private = (struct dasd_eckd_private *) device->private;
 319
 320         memset(data, 0, sizeof(*data));
 321         sector = 0;
 322         if (rec_on_trk) {
 323                 switch (private->rdc_data.dev_type) {
 324                 case 0x3390:
 325                         dn = ceil_quot(reclen + 6, 232);
 326                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 327                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 328                         break;
 329                 case 0x3380:
 330                         d = 7 + ceil_quot(reclen + 12, 32);
 331                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 332                         break;
 333                 }
 334         }
 335         data->sector = sector;
 336         /* note: meaning of count depends on the operation
 337          *       for record based I/O it's the number of records, but for
 338          *       track based I/O it's the number of tracks
 339          */
 340         data->count = count;
 341         switch (cmd) {
 342         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 343                 data->operation.orientation = 0x3;
 344                 data->operation.operation = 0x03;
 345                 break;
 346         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 347                 data->operation.orientation = 0x3;
 348                 data->operation.operation = 0x16;
 349                 break;
 350         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 351                 data->operation.orientation = 0x1;
 352                 data->operation.operation = 0x03;
 353                 data->count++;
 354                 break;
 355         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 356                 data->operation.orientation = 0x3;
 357                 data->operation.operation = 0x16;
 358                 data->count++;
 359                 break;
 360         case DASD_ECKD_CCW_WRITE:
 361         case DASD_ECKD_CCW_WRITE_MT:
 362         case DASD_ECKD_CCW_WRITE_KD:
 363         case DASD_ECKD_CCW_WRITE_KD_MT:
 364                 data->auxiliary.length_valid = 0x1;
 365                 data->length = reclen;
 366                 data->operation.operation = 0x01;
 367                 break;
 368         case DASD_ECKD_CCW_WRITE_CKD:
 369         case DASD_ECKD_CCW_WRITE_CKD_MT:
 370                 data->auxiliary.length_valid = 0x1;
 371                 data->length = reclen;
 372                 data->operation.operation = 0x03;
 373                 break;
 374         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 375                 data->auxiliary.length_valid = 0x1;
 376                 data->length = reclen;  /* not tlf, as one might think */
 377                 data->operation.operation = 0x3F;
 378                 data->extended_operation = 0x23;
 379                 break;
 380         case DASD_ECKD_CCW_READ:
 381         case DASD_ECKD_CCW_READ_MT:
 382         case DASD_ECKD_CCW_READ_KD:
 383         case DASD_ECKD_CCW_READ_KD_MT:
 384                 data->auxiliary.length_valid = 0x1;
 385                 data->length = reclen;
 386                 data->operation.operation = 0x06;
 387                 break;
 388         case DASD_ECKD_CCW_READ_CKD:
 389         case DASD_ECKD_CCW_READ_CKD_MT:
 390                 data->auxiliary.length_valid = 0x1;
 391                 data->length = reclen;
 392                 data->operation.operation = 0x16;
 393                 break;
 394         case DASD_ECKD_CCW_READ_COUNT:
 395                 data->operation.operation = 0x06;
 396                 break;
 397         case DASD_ECKD_CCW_READ_TRACK_DATA:
 398                 data->auxiliary.length_valid = 0x1;
 399                 data->length = tlf;
 400                 data->operation.operation = 0x0C;
 401                 break;
 402         case DASD_ECKD_CCW_ERASE:
 403                 data->length = reclen;
 404                 data->auxiliary.length_valid = 0x1;
 405                 data->operation.operation = 0x0b;
 406                 break;
 407         default:
 408                 DBF_DEV_EVENT(DBF_ERR, device,
 409                             "fill LRE unknown opcode 0x%x", cmd);
 410                 BUG();
 411         }
 412         set_ch_t(&data->seek_addr,
 413                  trk / private->rdc_data.trk_per_cyl,
 414                  trk % private->rdc_data.trk_per_cyl);
 415         data->search_arg.cyl = data->seek_addr.cyl;
 416         data->search_arg.head = data->seek_addr.head;
 417         data->search_arg.record = rec_on_trk;
 418 }
 419
 420 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 421                       unsigned int trk, unsigned int totrk, int cmd,
 422                       struct dasd_device *basedev, struct dasd_device *startdev,
 423                       unsigned char format, unsigned int rec_on_trk, int count,
 424                       unsigned int blksize, unsigned int tlf)
 425 {
 426         struct dasd_eckd_private *basepriv, *startpriv;
 427         struct DE_eckd_data *dedata;
 428         struct LRE_eckd_data *lredata;
 429         u32 begcyl, endcyl;
 430         u16 heads, beghead, endhead;
 431         int rc = 0;
 432
 433         basepriv = (struct dasd_eckd_private *) basedev->private;
 434         startpriv = (struct dasd_eckd_private *) startdev->private;
 435         dedata = &pfxdata->define_extent;
 436         lredata = &pfxdata->locate_record;
 437
 438         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 439         ccw->flags = 0;
 440         ccw->count = sizeof(*pfxdata);
 441         ccw->cda = (__u32) __pa(pfxdata);
 442
 443         memset(pfxdata, 0, sizeof(*pfxdata));
 444         /* prefix data */
 445         if (format > 1) {
 446                 DBF_DEV_EVENT(DBF_ERR, basedev,
 447                               "PFX LRE unknown format 0x%x", format);
 448                 BUG();
 449                 return -EINVAL;
 450         }
 451         pfxdata->format = format;
 452         pfxdata->base_address = basepriv->ned->unit_addr;
 453         pfxdata->base_lss = basepriv->ned->ID;
 454         pfxdata->validity.define_extent = 1;
 455
 456         /* private uid is kept up to date, conf_data may be outdated */
 457         if (startpriv->uid.type != UA_BASE_DEVICE) {
 458                 pfxdata->validity.verify_base = 1;
 459                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 460                         pfxdata->validity.hyper_pav = 1;
 461         }
 462
 463         /* define extend data (mostly)*/
 464         switch (cmd) {
 465         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 466         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 467         case DASD_ECKD_CCW_READ:
 468         case DASD_ECKD_CCW_READ_MT:
 469         case DASD_ECKD_CCW_READ_CKD:
 470         case DASD_ECKD_CCW_READ_CKD_MT:
 471         case DASD_ECKD_CCW_READ_KD:
 472         case DASD_ECKD_CCW_READ_KD_MT:
 473         case DASD_ECKD_CCW_READ_COUNT:
 474                 dedata->mask.perm = 0x1;
 475                 dedata->attributes.operation = basepriv->attrib.operation;
 476                 break;
 477         case DASD_ECKD_CCW_READ_TRACK_DATA:
 478                 dedata->mask.perm = 0x1;
 479                 dedata->attributes.operation = basepriv->attrib.operation;
 480                 dedata->blk_size = 0;
 481                 break;
 482         case DASD_ECKD_CCW_WRITE:
 483         case DASD_ECKD_CCW_WRITE_MT:
 484         case DASD_ECKD_CCW_WRITE_KD:
 485         case DASD_ECKD_CCW_WRITE_KD_MT:
 486                 dedata->mask.perm = 0x02;
 487                 dedata->attributes.operation = basepriv->attrib.operation;
 488                 rc = check_XRC_on_prefix(pfxdata, basedev);
 489                 break;
 490         case DASD_ECKD_CCW_WRITE_CKD:
 491         case DASD_ECKD_CCW_WRITE_CKD_MT:
 492                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 493                 rc = check_XRC_on_prefix(pfxdata, basedev);
 494                 break;
 495         case DASD_ECKD_CCW_ERASE:
 496         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 497         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 498                 dedata->mask.perm = 0x3;
 499                 dedata->mask.auth = 0x1;
 500                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 501                 rc = check_XRC_on_prefix(pfxdata, basedev);
 502                 break;
 503         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 504                 dedata->mask.perm = 0x02;
 505                 dedata->attributes.operation = basepriv->attrib.operation;
 506                 dedata->blk_size = blksize;
 507                 rc = check_XRC_on_prefix(pfxdata, basedev);
 508                 break;
 509         default:
 510                 DBF_DEV_EVENT(DBF_ERR, basedev,
 511                             "PFX LRE unknown opcode 0x%x", cmd);
 512                 BUG();
 513                 return -EINVAL;
 514         }
 515
 516         dedata->attributes.mode = 0x3;  /* ECKD */
 517
 518         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 519              basepriv->rdc_data.cu_type == 0x2107 ||
 520              basepriv->rdc_data.cu_type == 0x1750)
 521             && !(basepriv->uses_cdl && trk < 2))
 522                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 523
 524         heads = basepriv->rdc_data.trk_per_cyl;
 525         begcyl = trk / heads;
 526         beghead = trk % heads;
 527         endcyl = totrk / heads;
 528         endhead = totrk % heads;
 529
 530         /* check for sequential prestage - enhance cylinder range */
 531         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 532             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 533
 534                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 535                         endcyl += basepriv->attrib.nr_cyl;
 536                 else
 537                         endcyl = (basepriv->real_cyl - 1);
 538         }
 539
 540         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 541         set_ch_t(&dedata->end_ext, endcyl, endhead);
 542
 543         if (format == 1) {
 544                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 545                               basedev, blksize, tlf);
 546         }
 547
 548         return rc;
 549 }
 550
 551 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 552                   unsigned int trk, unsigned int totrk, int cmd,
 553                   struct dasd_device *basedev, struct dasd_device *startdev)
 554 {
 555         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 556                           0, 0, 0, 0, 0);
 557 }
 558
 559 static void
 560 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 561               unsigned int rec_on_trk, int no_rec, int cmd,
 562               struct dasd_device * device, int reclen)
 563 {
 564         struct dasd_eckd_private *private;
 565         int sector;
 566         int dn, d;
 567
 568         private = (struct dasd_eckd_private *) device->private;
 569
 570         DBF_DEV_EVENT(DBF_INFO, device,
 571                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 572                   trk, rec_on_trk, no_rec, cmd, reclen);
 573
 574         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 575         ccw->flags = 0;
 576         ccw->count = 16;
 577         ccw->cda = (__u32) __pa(data);
 578
 579         memset(data, 0, sizeof(struct LO_eckd_data));
 580         sector = 0;
 581         if (rec_on_trk) {
 582                 switch (private->rdc_data.dev_type) {
 583                 case 0x3390:
 584                         dn = ceil_quot(reclen + 6, 232);
 585                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 586                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 587                         break;
 588                 case 0x3380:
 589                         d = 7 + ceil_quot(reclen + 12, 32);
 590                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 591                         break;
 592                 }
 593         }
 594         data->sector = sector;
 595         data->count = no_rec;
 596         switch (cmd) {
 597         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 598                 data->operation.orientation = 0x3;
 599                 data->operation.operation = 0x03;
 600                 break;
 601         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 602                 data->operation.orientation = 0x3;
 603                 data->operation.operation = 0x16;
 604                 break;
 605         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 606                 data->operation.orientation = 0x1;
 607                 data->operation.operation = 0x03;
 608                 data->count++;
 609                 break;
 610         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 611                 data->operation.orientation = 0x3;
 612                 data->operation.operation = 0x16;
 613                 data->count++;
 614                 break;
 615         case DASD_ECKD_CCW_WRITE:
 616         case DASD_ECKD_CCW_WRITE_MT:
 617         case DASD_ECKD_CCW_WRITE_KD:
 618         case DASD_ECKD_CCW_WRITE_KD_MT:
 619                 data->auxiliary.last_bytes_used = 0x1;
 620                 data->length = reclen;
 621                 data->operation.operation = 0x01;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE_CKD:
 624         case DASD_ECKD_CCW_WRITE_CKD_MT:
 625                 data->auxiliary.last_bytes_used = 0x1;
 626                 data->length = reclen;
 627                 data->operation.operation = 0x03;
 628                 break;
 629         case DASD_ECKD_CCW_READ:
 630         case DASD_ECKD_CCW_READ_MT:
 631         case DASD_ECKD_CCW_READ_KD:
 632         case DASD_ECKD_CCW_READ_KD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x06;
 636                 break;
 637         case DASD_ECKD_CCW_READ_CKD:
 638         case DASD_ECKD_CCW_READ_CKD_MT:
 639                 data->auxiliary.last_bytes_used = 0x1;
 640                 data->length = reclen;
 641                 data->operation.operation = 0x16;
 642                 break;
 643         case DASD_ECKD_CCW_READ_COUNT:
 644                 data->operation.operation = 0x06;
 645                 break;
 646         case DASD_ECKD_CCW_ERASE:
 647                 data->length = reclen;
 648                 data->auxiliary.last_bytes_used = 0x1;
 649                 data->operation.operation = 0x0b;
 650                 break;
 651         default:
 652                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 653                               "opcode 0x%x", cmd);
 654         }
 655         set_ch_t(&data->seek_addr,
 656                  trk / private->rdc_data.trk_per_cyl,
 657                  trk % private->rdc_data.trk_per_cyl);
 658         data->search_arg.cyl = data->seek_addr.cyl;
 659         data->search_arg.head = data->seek_addr.head;
 660         data->search_arg.record = rec_on_trk;
 661 }
 662
 663 /*
 664  * Returns 1 if the block is one of the special blocks that needs
 665  * to get read/written with the KD variant of the command.
 666  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 667  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 668  * Luckily the KD variants differ only by one bit (0x08) from the
 669  * normal variant. So don't wonder about code like:
 670  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 671  *         ccw->cmd_code |= 0x8;
 672  */
 673 static inline int
 674 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 675 {
 676         if (recid < 3)
 677                 return 1;
 678         if (recid < blk_per_trk)
 679                 return 0;
 680         if (recid < 2 * blk_per_trk)
 681                 return 1;
 682         return 0;
 683 }
 684
 685 /*
 686  * Returns the record size for the special blocks of the cdl format.
 687  * Only returns something useful if dasd_eckd_cdl_special is true
 688  * for the recid.
 689  */
 690 static inline int
 691 dasd_eckd_cdl_reclen(int recid)
 692 {
 693         if (recid < 3)
 694                 return sizes_trk0[recid];
 695         return LABEL_SIZE;
 696 }
 697
 698 /*
 699  * Generate device unique id that specifies the physical device.
 700  */
 701 static int dasd_eckd_generate_uid(struct dasd_device *device,
 702                                   struct dasd_uid *uid)
 703 {
 704         struct dasd_eckd_private *private;
 705         int count;
 706
 707         private = (struct dasd_eckd_private *) device->private;
 708         if (!private)
 709                 return -ENODEV;
 710         if (!private->ned || !private->gneq)
 711                 return -ENODEV;
 712
 713         memset(uid, 0, sizeof(struct dasd_uid));
 714         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 715                sizeof(uid->vendor) - 1);
 716         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 717         memcpy(uid->serial, private->ned->HDA_location,
 718                sizeof(uid->serial) - 1);
 719         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 720         uid->ssid = private->gneq->subsystemID;
 721         uid->real_unit_addr = private->ned->unit_addr;;
 722         if (private->sneq) {
 723                 uid->type = private->sneq->sua_flags;
 724                 if (uid->type == UA_BASE_PAV_ALIAS)
 725                         uid->base_unit_addr = private->sneq->base_unit_addr;
 726         } else {
 727                 uid->type = UA_BASE_DEVICE;
 728         }
 729         if (private->vdsneq) {
 730                 for (count = 0; count < 16; count++) {
 731                         sprintf(uid->vduit+2*count, "%02x",
 732                                 private->vdsneq->uit[count]);
 733                 }
 734         }
 735         return 0;
 736 }
 737
 738 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 739                                                     void *rcd_buffer,
 740                                                     struct ciw *ciw, __u8 lpm)
 741 {
 742         struct dasd_ccw_req *cqr;
 743         struct ccw1 *ccw;
 744
 745         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 746
 747         if (IS_ERR(cqr)) {
 748                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 749                               "Could not allocate RCD request");
 750                 return cqr;
 751         }
 752
 753         ccw = cqr->cpaddr;
 754         ccw->cmd_code = ciw->cmd;
 755         ccw->cda = (__u32)(addr_t)rcd_buffer;
 756         ccw->count = ciw->count;
 757
 758         cqr->startdev = device;
 759         cqr->memdev = device;
 760         cqr->block = NULL;
 761         cqr->expires = 10*HZ;
 762         cqr->lpm = lpm;
 763         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 764         cqr->retries = 2;
 765         cqr->buildclk = get_clock();
 766         cqr->status = DASD_CQR_FILLED;
 767         return cqr;
 768 }
 769
 770 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 771                                    void **rcd_buffer,
 772                                    int *rcd_buffer_size, __u8 lpm)
 773 {
 774         struct ciw *ciw;
 775         char *rcd_buf = NULL;
 776         int ret;
 777         struct dasd_ccw_req *cqr;
 778
 779         /*
 780          * scan for RCD command in extended SenseID data
 781          */
 782         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 783         if (!ciw || ciw->cmd == 0) {
 784                 ret = -EOPNOTSUPP;
 785                 goto out_error;
 786         }
 787         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 788         if (!rcd_buf) {
 789                 ret = -ENOMEM;
 790                 goto out_error;
 791         }
 792
 793         /*
 794          * buffer has to start with EBCDIC "V1.0" to show
 795          * support for virtual device SNEQ
 796          */
 797         rcd_buf[0] = 0xE5;
 798         rcd_buf[1] = 0xF1;
 799         rcd_buf[2] = 0x4B;
 800         rcd_buf[3] = 0xF0;
 801         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 802         if (IS_ERR(cqr)) {
 803                 ret =  PTR_ERR(cqr);
 804                 goto out_error;
 805         }
 806         ret = dasd_sleep_on(cqr);
 807         /*
 808          * on success we update the user input parms
 809          */
 810         dasd_sfree_request(cqr, cqr->memdev);
 811         if (ret)
 812                 goto out_error;
 813
 814         *rcd_buffer_size = ciw->count;
 815         *rcd_buffer = rcd_buf;
 816         return 0;
 817 out_error:
 818         kfree(rcd_buf);
 819         *rcd_buffer = NULL;
 820         *rcd_buffer_size = 0;
 821         return ret;
 822 }
 823
 824 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 825 {
 826
 827         struct dasd_sneq *sneq;
 828         int i, count;
 829
 830         private->ned = NULL;
 831         private->sneq = NULL;
 832         private->vdsneq = NULL;
 833         private->gneq = NULL;
 834         count = private->conf_len / sizeof(struct dasd_sneq);
 835         sneq = (struct dasd_sneq *)private->conf_data;
 836         for (i = 0; i < count; ++i) {
 837                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 838                         private->sneq = sneq;
 839                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 840                         private->vdsneq = (struct vd_sneq *)sneq;
 841                 else if (sneq->flags.identifier == 2)
 842                         private->gneq = (struct dasd_gneq *)sneq;
 843                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 844                         private->ned = (struct dasd_ned *)sneq;
 845                 sneq++;
 846         }
 847         if (!private->ned || !private->gneq) {
 848                 private->ned = NULL;
 849                 private->sneq = NULL;
 850                 private->vdsneq = NULL;
 851                 private->gneq = NULL;
 852                 return -EINVAL;
 853         }
 854         return 0;
 855
 856 };
 857
 858 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 859 {
 860         struct dasd_gneq *gneq;
 861         int i, count, found;
 862
 863         count = conf_len / sizeof(*gneq);
 864         gneq = (struct dasd_gneq *)conf_data;
 865         found = 0;
 866         for (i = 0; i < count; ++i) {
 867                 if (gneq->flags.identifier == 2) {
 868                         found = 1;
 869                         break;
 870                 }
 871                 gneq++;
 872         }
 873         if (found)
 874                 return ((char *)gneq)[18] & 0x07;
 875         else
 876                 return 0;
 877 }
 878
 879 static int dasd_eckd_read_conf(struct dasd_device *device)
 880 {
 881         void *conf_data;
 882         int conf_len, conf_data_saved;
 883         int rc;
 884         __u8 lpm;
 885         struct dasd_eckd_private *private;
 886         struct dasd_eckd_path *path_data;
 887
 888         private = (struct dasd_eckd_private *) device->private;
 889         path_data = (struct dasd_eckd_path *) &private->path_data;
 890         path_data->opm = ccw_device_get_path_mask(device->cdev);
 891         lpm = 0x80;
 892         conf_data_saved = 0;
 893         /* get configuration data per operational path */
 894         for (lpm = 0x80; lpm; lpm>>= 1) {
 895                 if (lpm & path_data->opm){
 896                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 897                                                      &conf_len, lpm);
 898                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 899                                 DBF_EVENT(DBF_WARNING,
 900                                           "Read configuration data returned "
 901                                           "error %d for device: %s", rc,
 902                                           dev_name(&device->cdev->dev));
 903                                 return rc;
 904                         }
 905                         if (conf_data == NULL) {
 906                                 DBF_EVENT(DBF_WARNING, "No configuration "
 907                                           "data retrieved for device: %s",
 908                                           dev_name(&device->cdev->dev));
 909                                 continue;       /* no error */
 910                         }
 911                         /* save first valid configuration data */
 912                         if (!conf_data_saved) {
 913                                 kfree(private->conf_data);
 914                                 private->conf_data = conf_data;
 915                                 private->conf_len = conf_len;
 916                                 if (dasd_eckd_identify_conf_parts(private)) {
 917                                         private->conf_data = NULL;
 918                                         private->conf_len = 0;
 919                                         kfree(conf_data);
 920                                         continue;
 921                                 }
 922                                 conf_data_saved++;
 923                         }
 924                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 925                         case 0x02:
 926                                 path_data->npm |= lpm;
 927                                 break;
 928                         case 0x03:
 929                                 path_data->ppm |= lpm;
 930                                 break;
 931                         }
 932                         if (conf_data != private->conf_data)
 933                                 kfree(conf_data);
 934                 }
 935         }
 936         return 0;
 937 }
 938
 939 static int dasd_eckd_read_features(struct dasd_device *device)
 940 {
 941         struct dasd_psf_prssd_data *prssdp;
 942         struct dasd_rssd_features *features;
 943         struct dasd_ccw_req *cqr;
 944         struct ccw1 *ccw;
 945         int rc;
 946         struct dasd_eckd_private *private;
 947
 948         private = (struct dasd_eckd_private *) device->private;
 949         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 950                                    1 /* PSF */  + 1 /* RSSD */ ,
 951                                    (sizeof(struct dasd_psf_prssd_data) +
 952                                     sizeof(struct dasd_rssd_features)),
 953                                    device);
 954         if (IS_ERR(cqr)) {
 955                 DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
 956                           "request for device: %s",
 957                           dev_name(&device->cdev->dev));
 958                 return PTR_ERR(cqr);
 959         }
 960         cqr->startdev = device;
 961         cqr->memdev = device;
 962         cqr->block = NULL;
 963         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 964         cqr->retries = 5;
 965         cqr->expires = 10 * HZ;
 966
 967         /* Prepare for Read Subsystem Data */
 968         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 969         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 970         prssdp->order = PSF_ORDER_PRSSD;
 971         prssdp->suborder = 0x41;        /* Read Feature Codes */
 972         /* all other bytes of prssdp must be zero */
 973
 974         ccw = cqr->cpaddr;
 975         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 976         ccw->count = sizeof(struct dasd_psf_prssd_data);
 977         ccw->flags |= CCW_FLAG_CC;
 978         ccw->cda = (__u32)(addr_t) prssdp;
 979
 980         /* Read Subsystem Data - feature codes */
 981         features = (struct dasd_rssd_features *) (prssdp + 1);
 982         memset(features, 0, sizeof(struct dasd_rssd_features));
 983
 984         ccw++;
 985         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 986         ccw->count = sizeof(struct dasd_rssd_features);
 987         ccw->cda = (__u32)(addr_t) features;
 988
 989         cqr->buildclk = get_clock();
 990         cqr->status = DASD_CQR_FILLED;
 991         rc = dasd_sleep_on(cqr);
 992         if (rc == 0) {
 993                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 994                 features = (struct dasd_rssd_features *) (prssdp + 1);
 995                 memcpy(&private->features, features,
 996                        sizeof(struct dasd_rssd_features));
 997         }
 998         dasd_sfree_request(cqr, cqr->memdev);
 999         return rc;
1000 }
1001
1002
1003 /*
1004  * Build CP for Perform Subsystem Function - SSC.
1005  */
1006 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1007                                                     int enable_pav)
1008 {
1009         struct dasd_ccw_req *cqr;
1010         struct dasd_psf_ssc_data *psf_ssc_data;
1011         struct ccw1 *ccw;
1012
1013         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
1014                                   sizeof(struct dasd_psf_ssc_data),
1015                                   device);
1016
1017         if (IS_ERR(cqr)) {
1018                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1019                            "Could not allocate PSF-SSC request");
1020                 return cqr;
1021         }
1022         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1023         psf_ssc_data->order = PSF_ORDER_SSC;
1024         psf_ssc_data->suborder = 0x40;
1025         if (enable_pav) {
1026                 psf_ssc_data->suborder |= 0x88;
1027                 psf_ssc_data->reserved[0] = 0x88;
1028         }
1029         ccw = cqr->cpaddr;
1030         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1031         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1032         ccw->count = 66;
1033
1034         cqr->startdev = device;
1035         cqr->memdev = device;
1036         cqr->block = NULL;
1037         cqr->expires = 10*HZ;
1038         cqr->buildclk = get_clock();
1039         cqr->status = DASD_CQR_FILLED;
1040         return cqr;
1041 }
1042
1043 /*
1044  * Perform Subsystem Function.
1045  * It is necessary to trigger CIO for channel revalidation since this
1046  * call might change behaviour of DASD devices.
1047  */
1048 static int
1049 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1050 {
1051         struct dasd_ccw_req *cqr;
1052         int rc;
1053
1054         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1055         if (IS_ERR(cqr))
1056                 return PTR_ERR(cqr);
1057
1058         rc = dasd_sleep_on(cqr);
1059         if (!rc)
1060                 /* trigger CIO to reprobe devices */
1061                 css_schedule_reprobe();
1062         dasd_sfree_request(cqr, cqr->memdev);
1063         return rc;
1064 }
1065
1066 /*
1067  * Valide storage server of current device.
1068  */
1069 static int dasd_eckd_validate_server(struct dasd_device *device)
1070 {
1071         int rc;
1072         struct dasd_eckd_private *private;
1073         int enable_pav;
1074
1075         if (dasd_nopav || MACHINE_IS_VM)
1076                 enable_pav = 0;
1077         else
1078                 enable_pav = 1;
1079         rc = dasd_eckd_psf_ssc(device, enable_pav);
1080         /* may be requested feature is not available on server,
1081          * therefore just report error and go ahead */
1082         private = (struct dasd_eckd_private *) device->private;
1083         DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
1084                   "returned rc=%d for device: %s",
1085                   private->uid.vendor, private->uid.serial,
1086                   private->uid.ssid, rc, dev_name(&device->cdev->dev));
1087         /* RE-Read Configuration Data */
1088         return dasd_eckd_read_conf(device);
1089 }
1090
1091 /*
1092  * Check device characteristics.
1093  * If the device is accessible using ECKD discipline, the device is enabled.
1094  */
1095 static int
1096 dasd_eckd_check_characteristics(struct dasd_device *device)
1097 {
1098         struct dasd_eckd_private *private;
1099         struct dasd_block *block;
1100         void *rdc_data;
1101         int is_known, rc;
1102
1103         private = (struct dasd_eckd_private *) device->private;
1104         if (private == NULL) {
1105                 private = kzalloc(sizeof(struct dasd_eckd_private),
1106                                   GFP_KERNEL | GFP_DMA);
1107                 if (private == NULL) {
1108                         dev_warn(&device->cdev->dev,
1109                                  "Allocating memory for private DASD data "
1110                                  "failed\n");
1111                         return -ENOMEM;
1112                 }
1113                 device->private = (void *) private;
1114         }
1115         /* Invalidate status of initial analysis. */
1116         private->init_cqr_status = -1;
1117         /* Set default cache operations. */
1118         private->attrib.operation = DASD_NORMAL_CACHE;
1119         private->attrib.nr_cyl = 0;
1120
1121         /* Read Configuration Data */
1122         rc = dasd_eckd_read_conf(device);
1123         if (rc)
1124                 goto out_err1;
1125
1126         /* Generate device unique id and register in devmap */
1127         rc = dasd_eckd_generate_uid(device, &private->uid);
1128         if (rc)
1129                 goto out_err1;
1130         dasd_set_uid(device->cdev, &private->uid);
1131
1132         if (private->uid.type == UA_BASE_DEVICE) {
1133                 block = dasd_alloc_block();
1134                 if (IS_ERR(block)) {
1135                         DBF_EVENT(DBF_WARNING, "could not allocate dasd "
1136                                   "block structure for device: %s",
1137                                   dev_name(&device->cdev->dev));
1138                         rc = PTR_ERR(block);
1139                         goto out_err1;
1140                 }
1141                 device->block = block;
1142                 block->base = device;
1143         }
1144
1145         /* register lcu with alias handling, enable PAV if this is a new lcu */
1146         is_known = dasd_alias_make_device_known_to_lcu(device);
1147         if (is_known < 0) {
1148                 rc = is_known;
1149                 goto out_err2;
1150         }
1151         if (!is_known) {
1152                 /* new lcu found */
1153                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
1154                 if (rc)
1155                         goto out_err3;
1156         }
1157
1158         /* Read Feature Codes */
1159         rc = dasd_eckd_read_features(device);
1160         if (rc)
1161                 goto out_err3;
1162
1163         /* Read Device Characteristics */
1164         rdc_data = (void *) &(private->rdc_data);
1165         memset(rdc_data, 0, sizeof(rdc_data));
1166         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
1167         if (rc) {
1168                 DBF_EVENT(DBF_WARNING,
1169                           "Read device characteristics failed, rc=%d for "
1170                           "device: %s", rc, dev_name(&device->cdev->dev));
1171                 goto out_err3;
1172         }
1173         /* find the vaild cylinder size */
1174         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1175             private->rdc_data.long_no_cyl)
1176                 private->real_cyl = private->rdc_data.long_no_cyl;
1177         else
1178                 private->real_cyl = private->rdc_data.no_cyl;
1179
1180         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1181                  "with %d cylinders, %d heads, %d sectors\n",
1182                  private->rdc_data.dev_type,
1183                  private->rdc_data.dev_model,
1184                  private->rdc_data.cu_type,
1185                  private->rdc_data.cu_model.model,
1186                     private->real_cyl,
1187                  private->rdc_data.trk_per_cyl,
1188                  private->rdc_data.sec_per_trk);
1189         return 0;
1190
1191 out_err3:
1192         dasd_alias_disconnect_device_from_lcu(device);
1193 out_err2:
1194         dasd_free_block(device->block);
1195         device->block = NULL;
1196 out_err1:
1197         kfree(private->conf_data);
1198         kfree(device->private);
1199         device->private = NULL;
1200         return rc;
1201 }
1202
1203 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1204 {
1205         struct dasd_eckd_private *private;
1206
1207         private = (struct dasd_eckd_private *) device->private;
1208         dasd_alias_disconnect_device_from_lcu(device);
1209         private->ned = NULL;
1210         private->sneq = NULL;
1211         private->vdsneq = NULL;
1212         private->gneq = NULL;
1213         private->conf_len = 0;
1214         kfree(private->conf_data);
1215         private->conf_data = NULL;
1216 }
1217
1218 static struct dasd_ccw_req *
1219 dasd_eckd_analysis_ccw(struct dasd_device *device)
1220 {
1221         struct dasd_eckd_private *private;
1222         struct eckd_count *count_data;
1223         struct LO_eckd_data *LO_data;
1224         struct dasd_ccw_req *cqr;
1225         struct ccw1 *ccw;
1226         int cplength, datasize;
1227         int i;
1228
1229         private = (struct dasd_eckd_private *) device->private;
1230
1231         cplength = 8;
1232         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1233         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1234                                    cplength, datasize, device);
1235         if (IS_ERR(cqr))
1236                 return cqr;
1237         ccw = cqr->cpaddr;
1238         /* Define extent for the first 3 tracks. */
1239         define_extent(ccw++, cqr->data, 0, 2,
1240                       DASD_ECKD_CCW_READ_COUNT, device);
1241         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1242         /* Locate record for the first 4 records on track 0. */
1243         ccw[-1].flags |= CCW_FLAG_CC;
1244         locate_record(ccw++, LO_data++, 0, 0, 4,
1245                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1246
1247         count_data = private->count_area;
1248         for (i = 0; i < 4; i++) {
1249                 ccw[-1].flags |= CCW_FLAG_CC;
1250                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1251                 ccw->flags = 0;
1252                 ccw->count = 8;
1253                 ccw->cda = (__u32)(addr_t) count_data;
1254                 ccw++;
1255                 count_data++;
1256         }
1257
1258         /* Locate record for the first record on track 2. */
1259         ccw[-1].flags |= CCW_FLAG_CC;
1260         locate_record(ccw++, LO_data++, 2, 0, 1,
1261                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1262         /* Read count ccw. */
1263         ccw[-1].flags |= CCW_FLAG_CC;
1264         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1265         ccw->flags = 0;
1266         ccw->count = 8;
1267         ccw->cda = (__u32)(addr_t) count_data;
1268
1269         cqr->block = NULL;
1270         cqr->startdev = device;
1271         cqr->memdev = device;
1272         cqr->retries = 0;
1273         cqr->buildclk = get_clock();
1274         cqr->status = DASD_CQR_FILLED;
1275         return cqr;
1276 }
1277
1278 /*
1279  * This is the callback function for the init_analysis cqr. It saves
1280  * the status of the initial analysis ccw before it frees it and kicks
1281  * the device to continue the startup sequence. This will call
1282  * dasd_eckd_do_analysis again (if the devices has not been marked
1283  * for deletion in the meantime).
1284  */
1285 static void
1286 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1287 {
1288         struct dasd_eckd_private *private;
1289         struct dasd_device *device;
1290
1291         device = init_cqr->startdev;
1292         private = (struct dasd_eckd_private *) device->private;
1293         private->init_cqr_status = init_cqr->status;
1294         dasd_sfree_request(init_cqr, device);
1295         dasd_kick_device(device);
1296 }
1297
1298 static int
1299 dasd_eckd_start_analysis(struct dasd_block *block)
1300 {
1301         struct dasd_eckd_private *private;
1302         struct dasd_ccw_req *init_cqr;
1303
1304         private = (struct dasd_eckd_private *) block->base->private;
1305         init_cqr = dasd_eckd_analysis_ccw(block->base);
1306         if (IS_ERR(init_cqr))
1307                 return PTR_ERR(init_cqr);
1308         init_cqr->callback = dasd_eckd_analysis_callback;
1309         init_cqr->callback_data = NULL;
1310         init_cqr->expires = 5*HZ;
1311         dasd_add_request_head(init_cqr);
1312         return -EAGAIN;
1313 }
1314
1315 static int
1316 dasd_eckd_end_analysis(struct dasd_block *block)
1317 {
1318         struct dasd_device *device;
1319         struct dasd_eckd_private *private;
1320         struct eckd_count *count_area;
1321         unsigned int sb, blk_per_trk;
1322         int status, i;
1323
1324         device = block->base;
1325         private = (struct dasd_eckd_private *) device->private;
1326         status = private->init_cqr_status;
1327         private->init_cqr_status = -1;
1328         if (status != DASD_CQR_DONE) {
1329                 dev_warn(&device->cdev->dev,
1330                             "The DASD is not formatted\n");
1331                 return -EMEDIUMTYPE;
1332         }
1333
1334         private->uses_cdl = 1;
1335         /* Check Track 0 for Compatible Disk Layout */
1336         count_area = NULL;
1337         for (i = 0; i < 3; i++) {
1338                 if (private->count_area[i].kl != 4 ||
1339                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1340                         private->uses_cdl = 0;
1341                         break;
1342                 }
1343         }
1344         if (i == 3)
1345                 count_area = &private->count_area[4];
1346
1347         if (private->uses_cdl == 0) {
1348                 for (i = 0; i < 5; i++) {
1349                         if ((private->count_area[i].kl != 0) ||
1350                             (private->count_area[i].dl !=
1351                              private->count_area[0].dl))
1352                                 break;
1353                 }
1354                 if (i == 5)
1355                         count_area = &private->count_area[0];
1356         } else {
1357                 if (private->count_area[3].record == 1)
1358                         dev_warn(&device->cdev->dev,
1359                                  "Track 0 has no records following the VTOC\n");
1360         }
1361         if (count_area != NULL && count_area->kl == 0) {
1362                 /* we found notthing violating our disk layout */
1363                 if (dasd_check_blocksize(count_area->dl) == 0)
1364                         block->bp_block = count_area->dl;
1365         }
1366         if (block->bp_block == 0) {
1367                 dev_warn(&device->cdev->dev,
1368                          "The disk layout of the DASD is not supported\n");
1369                 return -EMEDIUMTYPE;
1370         }
1371         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1372         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1373                 block->s2b_shift++;
1374
1375         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1376         block->blocks = (private->real_cyl *
1377                           private->rdc_data.trk_per_cyl *
1378                           blk_per_trk);
1379
1380         dev_info(&device->cdev->dev,
1381                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1382                  "%s\n", (block->bp_block >> 10),
1383                  ((private->real_cyl *
1384                    private->rdc_data.trk_per_cyl *
1385                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1386                  ((blk_per_trk * block->bp_block) >> 10),
1387                  private->uses_cdl ?
1388                  "compatible disk layout" : "linux disk layout");
1389
1390         return 0;
1391 }
1392
1393 static int dasd_eckd_do_analysis(struct dasd_block *block)
1394 {
1395         struct dasd_eckd_private *private;
1396
1397         private = (struct dasd_eckd_private *) block->base->private;
1398         if (private->init_cqr_status < 0)
1399                 return dasd_eckd_start_analysis(block);
1400         else
1401                 return dasd_eckd_end_analysis(block);
1402 }
1403
1404 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1405 {
1406         return dasd_alias_add_device(device);
1407 };
1408
1409 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1410 {
1411         return dasd_alias_remove_device(device);
1412 };
1413
1414 static int
1415 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1416 {
1417         struct dasd_eckd_private *private;
1418
1419         private = (struct dasd_eckd_private *) block->base->private;
1420         if (dasd_check_blocksize(block->bp_block) == 0) {
1421                 geo->sectors = recs_per_track(&private->rdc_data,
1422                                               0, block->bp_block);
1423         }
1424         geo->cylinders = private->rdc_data.no_cyl;
1425         geo->heads = private->rdc_data.trk_per_cyl;
1426         return 0;
1427 }
1428
1429 static struct dasd_ccw_req *
1430 dasd_eckd_format_device(struct dasd_device * device,
1431                         struct format_data_t * fdata)
1432 {
1433         struct dasd_eckd_private *private;
1434         struct dasd_ccw_req *fcp;
1435         struct eckd_count *ect;
1436         struct ccw1 *ccw;
1437         void *data;
1438         int rpt;
1439         struct ch_t address;
1440         int cplength, datasize;
1441         int i;
1442         int intensity = 0;
1443         int r0_perm;
1444
1445         private = (struct dasd_eckd_private *) device->private;
1446         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1447         set_ch_t(&address,
1448                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1449                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1450
1451         /* Sanity checks. */
1452         if (fdata->start_unit >=
1453             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1454                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1455                          "formatting is too big\n", fdata->start_unit);
1456                 return ERR_PTR(-EINVAL);
1457         }
1458         if (fdata->start_unit > fdata->stop_unit) {
1459                 dev_warn(&device->cdev->dev, "Start track %d used in "
1460                          "formatting exceeds end track\n", fdata->start_unit);
1461                 return ERR_PTR(-EINVAL);
1462         }
1463         if (dasd_check_blocksize(fdata->blksize) != 0) {
1464                 dev_warn(&device->cdev->dev,
1465                          "The DASD cannot be formatted with block size %d\n",
1466                          fdata->blksize);
1467                 return ERR_PTR(-EINVAL);
1468         }
1469
1470         /*
1471          * fdata->intensity is a bit string that tells us what to do:
1472          *   Bit 0: write record zero
1473          *   Bit 1: write home address, currently not supported
1474          *   Bit 2: invalidate tracks
1475          *   Bit 3: use OS/390 compatible disk layout (cdl)
1476          *   Bit 4: do not allow storage subsystem to modify record zero
1477          * Only some bit combinations do make sense.
1478          */
1479         if (fdata->intensity & 0x10) {
1480                 r0_perm = 0;
1481                 intensity = fdata->intensity & ~0x10;
1482         } else {
1483                 r0_perm = 1;
1484                 intensity = fdata->intensity;
1485         }
1486         switch (intensity) {
1487         case 0x00:      /* Normal format */
1488         case 0x08:      /* Normal format, use cdl. */
1489                 cplength = 2 + rpt;
1490                 datasize = sizeof(struct DE_eckd_data) +
1491                         sizeof(struct LO_eckd_data) +
1492                         rpt * sizeof(struct eckd_count);
1493                 break;
1494         case 0x01:      /* Write record zero and format track. */
1495         case 0x09:      /* Write record zero and format track, use cdl. */
1496                 cplength = 3 + rpt;
1497                 datasize = sizeof(struct DE_eckd_data) +
1498                         sizeof(struct LO_eckd_data) +
1499                         sizeof(struct eckd_count) +
1500                         rpt * sizeof(struct eckd_count);
1501                 break;
1502         case 0x04:      /* Invalidate track. */
1503         case 0x0c:      /* Invalidate track, use cdl. */
1504                 cplength = 3;
1505                 datasize = sizeof(struct DE_eckd_data) +
1506                         sizeof(struct LO_eckd_data) +
1507                         sizeof(struct eckd_count);
1508                 break;
1509         default:
1510                 dev_warn(&device->cdev->dev, "An I/O control call used "
1511                          "incorrect flags 0x%x\n", fdata->intensity);
1512                 return ERR_PTR(-EINVAL);
1513         }
1514         /* Allocate the format ccw request. */
1515         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1516                                    cplength, datasize, device);
1517         if (IS_ERR(fcp))
1518                 return fcp;
1519
1520         data = fcp->data;
1521         ccw = fcp->cpaddr;
1522
1523         switch (intensity & ~0x08) {
1524         case 0x00: /* Normal format. */
1525                 define_extent(ccw++, (struct DE_eckd_data *) data,
1526                               fdata->start_unit, fdata->start_unit,
1527                               DASD_ECKD_CCW_WRITE_CKD, device);
1528                 /* grant subsystem permission to format R0 */
1529                 if (r0_perm)
1530                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1531                 data += sizeof(struct DE_eckd_data);
1532                 ccw[-1].flags |= CCW_FLAG_CC;
1533                 locate_record(ccw++, (struct LO_eckd_data *) data,
1534                               fdata->start_unit, 0, rpt,
1535                               DASD_ECKD_CCW_WRITE_CKD, device,
1536                               fdata->blksize);
1537                 data += sizeof(struct LO_eckd_data);
1538                 break;
1539         case 0x01: /* Write record zero + format track. */
1540                 define_extent(ccw++, (struct DE_eckd_data *) data,
1541                               fdata->start_unit, fdata->start_unit,
1542                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1543                               device);
1544                 data += sizeof(struct DE_eckd_data);
1545                 ccw[-1].flags |= CCW_FLAG_CC;
1546                 locate_record(ccw++, (struct LO_eckd_data *) data,
1547                               fdata->start_unit, 0, rpt + 1,
1548                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1549                               device->block->bp_block);
1550                 data += sizeof(struct LO_eckd_data);
1551                 break;
1552         case 0x04: /* Invalidate track. */
1553                 define_extent(ccw++, (struct DE_eckd_data *) data,
1554                               fdata->start_unit, fdata->start_unit,
1555                               DASD_ECKD_CCW_WRITE_CKD, device);
1556                 data += sizeof(struct DE_eckd_data);
1557                 ccw[-1].flags |= CCW_FLAG_CC;
1558                 locate_record(ccw++, (struct LO_eckd_data *) data,
1559                               fdata->start_unit, 0, 1,
1560                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1561                 data += sizeof(struct LO_eckd_data);
1562                 break;
1563         }
1564         if (intensity & 0x01) { /* write record zero */
1565                 ect = (struct eckd_count *) data;
1566                 data += sizeof(struct eckd_count);
1567                 ect->cyl = address.cyl;
1568                 ect->head = address.head;
1569                 ect->record = 0;
1570                 ect->kl = 0;
1571                 ect->dl = 8;
1572                 ccw[-1].flags |= CCW_FLAG_CC;
1573                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1574                 ccw->flags = CCW_FLAG_SLI;
1575                 ccw->count = 8;
1576                 ccw->cda = (__u32)(addr_t) ect;
1577                 ccw++;
1578         }
1579         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1580                 ect = (struct eckd_count *) data;
1581                 data += sizeof(struct eckd_count);
1582                 ect->cyl = address.cyl;
1583                 ect->head = address.head;
1584                 ect->record = 1;
1585                 ect->kl = 0;
1586                 ect->dl = 0;
1587                 ccw[-1].flags |= CCW_FLAG_CC;
1588                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1589                 ccw->flags = CCW_FLAG_SLI;
1590                 ccw->count = 8;
1591                 ccw->cda = (__u32)(addr_t) ect;
1592         } else {                /* write remaining records */
1593                 for (i = 0; i < rpt; i++) {
1594                         ect = (struct eckd_count *) data;
1595                         data += sizeof(struct eckd_count);
1596                         ect->cyl = address.cyl;
1597                         ect->head = address.head;
1598                         ect->record = i + 1;
1599                         ect->kl = 0;
1600                         ect->dl = fdata->blksize;
1601                         /* Check for special tracks 0-1 when formatting CDL */
1602                         if ((intensity & 0x08) &&
1603                             fdata->start_unit == 0) {
1604                                 if (i < 3) {
1605                                         ect->kl = 4;
1606                                         ect->dl = sizes_trk0[i] - 4;
1607                                 }
1608                         }
1609                         if ((intensity & 0x08) &&
1610                             fdata->start_unit == 1) {
1611                                 ect->kl = 44;
1612                                 ect->dl = LABEL_SIZE - 44;
1613                         }
1614                         ccw[-1].flags |= CCW_FLAG_CC;
1615                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1616                         ccw->flags = CCW_FLAG_SLI;
1617                         ccw->count = 8;
1618                         ccw->cda = (__u32)(addr_t) ect;
1619                         ccw++;
1620                 }
1621         }
1622         fcp->startdev = device;
1623         fcp->memdev = device;
1624         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1625         fcp->retries = 5;       /* set retry counter to enable default ERP */
1626         fcp->buildclk = get_clock();
1627         fcp->status = DASD_CQR_FILLED;
1628         return fcp;
1629 }
1630
1631 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1632 {
1633         cqr->status = DASD_CQR_FILLED;
1634         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1635                 dasd_eckd_reset_ccw_to_base_io(cqr);
1636                 cqr->startdev = cqr->block->base;
1637         }
1638 };
1639
1640 static dasd_erp_fn_t
1641 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1642 {
1643         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1644         struct ccw_device *cdev = device->cdev;
1645
1646         switch (cdev->id.cu_type) {
1647         case 0x3990:
1648         case 0x2105:
1649         case 0x2107:
1650         case 0x1750:
1651                 return dasd_3990_erp_action;
1652         case 0x9343:
1653         case 0x3880:
1654         default:
1655                 return dasd_default_erp_action;
1656         }
1657 }
1658
1659 static dasd_erp_fn_t
1660 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1661 {
1662         return dasd_default_erp_postaction;
1663 }
1664
1665
1666 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1667                                                    struct irb *irb)
1668 {
1669         char mask;
1670         char *sense = NULL;
1671
1672         /* first of all check for state change pending interrupt */
1673         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1674         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1675                 dasd_generic_handle_state_change(device);
1676                 return;
1677         }
1678
1679         /* summary unit check */
1680         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1681             (irb->ecw[7] == 0x0D)) {
1682                 dasd_alias_handle_summary_unit_check(device, irb);
1683                 return;
1684         }
1685
1686         sense = dasd_get_sense(irb);
1687         /* service information message SIM */
1688         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1689             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1690                 dasd_3990_erp_handle_sim(device, sense);
1691                 dasd_schedule_device_bh(device);
1692                 return;
1693         }
1694
1695         if ((scsw_cc(&irb->scsw) == 1) &&
1696             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1697             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1698             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1699                 /* fake irb do nothing, they are handled elsewhere */
1700                 dasd_schedule_device_bh(device);
1701                 return;
1702         }
1703
1704         if (!sense) {
1705                 /* just report other unsolicited interrupts */
1706                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1707                             "unsolicited interrupt received");
1708         } else {
1709                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1710                             "unsolicited interrupt received "
1711                             "(sense available)");
1712                 device->discipline->dump_sense_dbf(device, NULL, irb,
1713                                                    "unsolicited");
1714         }
1715
1716         dasd_schedule_device_bh(device);
1717         return;
1718 };
1719
1720
1721 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1722                                                struct dasd_device *startdev,
1723                                                struct dasd_block *block,
1724                                                struct request *req,
1725                                                sector_t first_rec,
1726                                                sector_t last_rec,
1727                                                sector_t first_trk,
1728                                                sector_t last_trk,
1729                                                unsigned int first_offs,
1730                                                unsigned int last_offs,
1731                                                unsigned int blk_per_trk,
1732                                                unsigned int blksize)
1733 {
1734         struct dasd_eckd_private *private;
1735         unsigned long *idaws;
1736         struct LO_eckd_data *LO_data;
1737         struct dasd_ccw_req *cqr;
1738         struct ccw1 *ccw;
1739         struct req_iterator iter;
1740         struct bio_vec *bv;
1741         char *dst;
1742         unsigned int off;
1743         int count, cidaw, cplength, datasize;
1744         sector_t recid;
1745         unsigned char cmd, rcmd;
1746         int use_prefix;
1747         struct dasd_device *basedev;
1748
1749         basedev = block->base;
1750         private = (struct dasd_eckd_private *) basedev->private;
1751         if (rq_data_dir(req) == READ)
1752                 cmd = DASD_ECKD_CCW_READ_MT;
1753         else if (rq_data_dir(req) == WRITE)
1754                 cmd = DASD_ECKD_CCW_WRITE_MT;
1755         else
1756                 return ERR_PTR(-EINVAL);
1757
1758         /* Check struct bio and count the number of blocks for the request. */
1759         count = 0;
1760         cidaw = 0;
1761         rq_for_each_segment(bv, req, iter) {
1762                 if (bv->bv_len & (blksize - 1))
1763                         /* Eckd can only do full blocks. */
1764                         return ERR_PTR(-EINVAL);
1765                 count += bv->bv_len >> (block->s2b_shift + 9);
1766 #if defined(CONFIG_64BIT)
1767                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1768                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1769 #endif
1770         }
1771         /* Paranoia. */
1772         if (count != last_rec - first_rec + 1)
1773                 return ERR_PTR(-EINVAL);
1774
1775         /* use the prefix command if available */
1776         use_prefix = private->features.feature[8] & 0x01;
1777         if (use_prefix) {
1778                 /* 1x prefix + number of blocks */
1779                 cplength = 2 + count;
1780                 /* 1x prefix + cidaws*sizeof(long) */
1781                 datasize = sizeof(struct PFX_eckd_data) +
1782                         sizeof(struct LO_eckd_data) +
1783                         cidaw * sizeof(unsigned long);
1784         } else {
1785                 /* 1x define extent + 1x locate record + number of blocks */
1786                 cplength = 2 + count;
1787                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1788                 datasize = sizeof(struct DE_eckd_data) +
1789                         sizeof(struct LO_eckd_data) +
1790                         cidaw * sizeof(unsigned long);
1791         }
1792         /* Find out the number of additional locate record ccws for cdl. */
1793         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1794                 if (last_rec >= 2*blk_per_trk)
1795                         count = 2*blk_per_trk - first_rec;
1796                 cplength += count;
1797                 datasize += count*sizeof(struct LO_eckd_data);
1798         }
1799         /* Allocate the ccw request. */
1800         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1801                                    cplength, datasize, startdev);
1802         if (IS_ERR(cqr))
1803                 return cqr;
1804         ccw = cqr->cpaddr;
1805         /* First ccw is define extent or prefix. */
1806         if (use_prefix) {
1807                 if (prefix(ccw++, cqr->data, first_trk,
1808                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1809                         /* Clock not in sync and XRC is enabled.
1810                          * Try again later.
1811                          */
1812                         dasd_sfree_request(cqr, startdev);
1813                         return ERR_PTR(-EAGAIN);
1814                 }
1815                 idaws = (unsigned long *) (cqr->data +
1816                                            sizeof(struct PFX_eckd_data));
1817         } else {
1818                 if (define_extent(ccw++, cqr->data, first_trk,
1819                                   last_trk, cmd, startdev) == -EAGAIN) {
1820                         /* Clock not in sync and XRC is enabled.
1821                          * Try again later.
1822                          */
1823                         dasd_sfree_request(cqr, startdev);
1824                         return ERR_PTR(-EAGAIN);
1825                 }
1826                 idaws = (unsigned long *) (cqr->data +
1827                                            sizeof(struct DE_eckd_data));
1828         }
1829         /* Build locate_record+read/write/ccws. */
1830         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1831         recid = first_rec;
1832         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1833                 /* Only standard blocks so there is just one locate record. */
1834                 ccw[-1].flags |= CCW_FLAG_CC;
1835                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1836                               last_rec - recid + 1, cmd, basedev, blksize);
1837         }
1838         rq_for_each_segment(bv, req, iter) {
1839                 dst = page_address(bv->bv_page) + bv->bv_offset;
1840                 if (dasd_page_cache) {
1841                         char *copy = kmem_cache_alloc(dasd_page_cache,
1842                                                       GFP_DMA | __GFP_NOWARN);
1843                         if (copy && rq_data_dir(req) == WRITE)
1844                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1845                         if (copy)
1846                                 dst = copy + bv->bv_offset;
1847                 }
1848                 for (off = 0; off < bv->bv_len; off += blksize) {
1849                         sector_t trkid = recid;
1850                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1851                         rcmd = cmd;
1852                         count = blksize;
1853                         /* Locate record for cdl special block ? */
1854                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1855                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1856                                         rcmd |= 0x8;
1857                                         count = dasd_eckd_cdl_reclen(recid);
1858                                         if (count < blksize &&
1859                                             rq_data_dir(req) == READ)
1860                                                 memset(dst + count, 0xe5,
1861                                                        blksize - count);
1862                                 }
1863                                 ccw[-1].flags |= CCW_FLAG_CC;
1864                                 locate_record(ccw++, LO_data++,
1865                                               trkid, recoffs + 1,
1866                                               1, rcmd, basedev, count);
1867                         }
1868                         /* Locate record for standard blocks ? */
1869                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1870                                 ccw[-1].flags |= CCW_FLAG_CC;
1871                                 locate_record(ccw++, LO_data++,
1872                                               trkid, recoffs + 1,
1873                                               last_rec - recid + 1,
1874                                               cmd, basedev, count);
1875                         }
1876                         /* Read/write ccw. */
1877                         ccw[-1].flags |= CCW_FLAG_CC;
1878                         ccw->cmd_code = rcmd;
1879                         ccw->count = count;
1880                         if (idal_is_needed(dst, blksize)) {
1881                                 ccw->cda = (__u32)(addr_t) idaws;
1882                                 ccw->flags = CCW_FLAG_IDA;
1883                                 idaws = idal_create_words(idaws, dst, blksize);
1884                         } else {
1885                                 ccw->cda = (__u32)(addr_t) dst;
1886                                 ccw->flags = 0;
1887                         }
1888                         ccw++;
1889                         dst += blksize;
1890                         recid++;
1891                 }
1892         }
1893         if (blk_noretry_request(req) ||
1894             block->base->features & DASD_FEATURE_FAILFAST)
1895                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1896         cqr->startdev = startdev;
1897         cqr->memdev = startdev;
1898         cqr->block = block;
1899         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1900         cqr->lpm = private->path_data.ppm;
1901         cqr->retries = 256;
1902         cqr->buildclk = get_clock();
1903         cqr->status = DASD_CQR_FILLED;
1904         return cqr;
1905 }
1906
1907 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1908                                                struct dasd_device *startdev,
1909                                                struct dasd_block *block,
1910                                                struct request *req,
1911                                                sector_t first_rec,
1912                                                sector_t last_rec,
1913                                                sector_t first_trk,
1914                                                sector_t last_trk,
1915                                                unsigned int first_offs,
1916                                                unsigned int last_offs,
1917                                                unsigned int blk_per_trk,
1918                                                unsigned int blksize)
1919 {
1920         struct dasd_eckd_private *private;
1921         unsigned long *idaws;
1922         struct dasd_ccw_req *cqr;
1923         struct ccw1 *ccw;
1924         struct req_iterator iter;
1925         struct bio_vec *bv;
1926         char *dst, *idaw_dst;
1927         unsigned int cidaw, cplength, datasize;
1928         unsigned int tlf;
1929         sector_t recid;
1930         unsigned char cmd;
1931         struct dasd_device *basedev;
1932         unsigned int trkcount, count, count_to_trk_end;
1933         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1934         unsigned char new_track, end_idaw;
1935         sector_t trkid;
1936         unsigned int recoffs;
1937
1938         basedev = block->base;
1939         private = (struct dasd_eckd_private *) basedev->private;
1940         if (rq_data_dir(req) == READ)
1941                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1942         else if (rq_data_dir(req) == WRITE)
1943                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1944         else
1945                 return ERR_PTR(-EINVAL);
1946
1947         /* Track based I/O needs IDAWs for each page, and not just for
1948          * 64 bit addresses. We need additional idals for pages
1949          * that get filled from two tracks, so we use the number
1950          * of records as upper limit.
1951          */
1952         cidaw = last_rec - first_rec + 1;
1953         trkcount = last_trk - first_trk + 1;
1954
1955         /* 1x prefix + one read/write ccw per track */
1956         cplength = 1 + trkcount;
1957
1958         /* on 31-bit we need space for two 32 bit addresses per page
1959          * on 64-bit one 64 bit address
1960          */
1961         datasize = sizeof(struct PFX_eckd_data) +
1962                 cidaw * sizeof(unsigned long long);
1963
1964         /* Allocate the ccw request. */
1965         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1966                                    cplength, datasize, startdev);
1967         if (IS_ERR(cqr))
1968                 return cqr;
1969         ccw = cqr->cpaddr;
1970         /* transfer length factor: how many bytes to read from the last track */
1971         if (first_trk == last_trk)
1972                 tlf = last_offs - first_offs + 1;
1973         else
1974                 tlf = last_offs + 1;
1975         tlf *= blksize;
1976
1977         if (prefix_LRE(ccw++, cqr->data, first_trk,
1978                        last_trk, cmd, basedev, startdev,
1979                        1 /* format */, first_offs + 1,
1980                        trkcount, blksize,
1981                        tlf) == -EAGAIN) {
1982                 /* Clock not in sync and XRC is enabled.
1983                  * Try again later.
1984                  */
1985                 dasd_sfree_request(cqr, startdev);
1986                 return ERR_PTR(-EAGAIN);
1987         }
1988
1989         /*
1990          * The translation of request into ccw programs must meet the
1991          * following conditions:
1992          * - all idaws but the first and the last must address full pages
1993          *   (or 2K blocks on 31-bit)
1994          * - the scope of a ccw and it's idal ends with the track boundaries
1995          */
1996         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1997         recid = first_rec;
1998         new_track = 1;
1999         end_idaw = 0;
2000         len_to_track_end = 0;
2001         idaw_dst = 0;
2002         idaw_len = 0;
2003         rq_for_each_segment(bv, req, iter) {
2004                 dst = page_address(bv->bv_page) + bv->bv_offset;
2005                 seg_len = bv->bv_len;
2006                 while (seg_len) {
2007                         if (new_track) {
2008                                 trkid = recid;
2009                                 recoffs = sector_div(trkid, blk_per_trk);
2010                                 count_to_trk_end = blk_per_trk - recoffs;
2011                                 count = min((last_rec - recid + 1),
2012                                             (sector_t)count_to_trk_end);
2013                                 len_to_track_end = count * blksize;
2014                                 ccw[-1].flags |= CCW_FLAG_CC;
2015                                 ccw->cmd_code = cmd;
2016                                 ccw->count = len_to_track_end;
2017                                 ccw->cda = (__u32)(addr_t)idaws;
2018                                 ccw->flags = CCW_FLAG_IDA;
2019                                 ccw++;
2020                                 recid += count;
2021                                 new_track = 0;
2022                                 /* first idaw for a ccw may start anywhere */
2023                                 if (!idaw_dst)
2024                                         idaw_dst = dst;
2025                         }
2026                         /* If we start a new idaw, we must make sure that it
2027                          * starts on an IDA_BLOCK_SIZE boundary.
2028                          * If we continue an idaw, we must make sure that the
2029                          * current segment begins where the so far accumulated
2030                          * idaw ends
2031                          */
2032                         if (!idaw_dst) {
2033                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2034                                         dasd_sfree_request(cqr, startdev);
2035                                         return ERR_PTR(-ERANGE);
2036                                 } else
2037                                         idaw_dst = dst;
2038                         }
2039                         if ((idaw_dst + idaw_len) != dst) {
2040                                 dasd_sfree_request(cqr, startdev);
2041                                 return ERR_PTR(-ERANGE);
2042                         }
2043                         part_len = min(seg_len, len_to_track_end);
2044                         seg_len -= part_len;
2045                         dst += part_len;
2046                         idaw_len += part_len;
2047                         len_to_track_end -= part_len;
2048                         /* collected memory area ends on an IDA_BLOCK border,
2049                          * -> create an idaw
2050                          * idal_create_words will handle cases where idaw_len
2051                          * is larger then IDA_BLOCK_SIZE
2052                          */
2053                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2054                                 end_idaw = 1;
2055                         /* We also need to end the idaw at track end */
2056                         if (!len_to_track_end) {
2057                                 new_track = 1;
2058                                 end_idaw = 1;
2059                         }
2060                         if (end_idaw) {
2061                                 idaws = idal_create_words(idaws, idaw_dst,
2062                                                           idaw_len);
2063                                 idaw_dst = 0;
2064                                 idaw_len = 0;
2065                                 end_idaw = 0;
2066                         }
2067                 }
2068         }
2069
2070         if (blk_noretry_request(req) ||
2071             block->base->features & DASD_FEATURE_FAILFAST)
2072                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2073         cqr->startdev = startdev;
2074         cqr->memdev = startdev;
2075         cqr->block = block;
2076         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2077         cqr->lpm = private->path_data.ppm;
2078         cqr->retries = 256;
2079         cqr->buildclk = get_clock();
2080         cqr->status = DASD_CQR_FILLED;
2081         return cqr;
2082 }
2083
2084 static int prepare_itcw(struct itcw *itcw,
2085                         unsigned int trk, unsigned int totrk, int cmd,
2086                         struct dasd_device *basedev,
2087                         struct dasd_device *startdev,
2088                         unsigned int rec_on_trk, int count,
2089                         unsigned int blksize,
2090                         unsigned int total_data_size,
2091                         unsigned int tlf,
2092                         unsigned int blk_per_trk)
2093 {
2094         struct PFX_eckd_data pfxdata;
2095         struct dasd_eckd_private *basepriv, *startpriv;
2096         struct DE_eckd_data *dedata;
2097         struct LRE_eckd_data *lredata;
2098         struct dcw *dcw;
2099
2100         u32 begcyl, endcyl;
2101         u16 heads, beghead, endhead;
2102         u8 pfx_cmd;
2103
2104         int rc = 0;
2105         int sector = 0;
2106         int dn, d;
2107
2108
2109         /* setup prefix data */
2110         basepriv = (struct dasd_eckd_private *) basedev->private;
2111         startpriv = (struct dasd_eckd_private *) startdev->private;
2112         dedata = &pfxdata.define_extent;
2113         lredata = &pfxdata.locate_record;
2114
2115         memset(&pfxdata, 0, sizeof(pfxdata));
2116         pfxdata.format = 1; /* PFX with LRE */
2117         pfxdata.base_address = basepriv->ned->unit_addr;
2118         pfxdata.base_lss = basepriv->ned->ID;
2119         pfxdata.validity.define_extent = 1;
2120
2121         /* private uid is kept up to date, conf_data may be outdated */
2122         if (startpriv->uid.type != UA_BASE_DEVICE) {
2123                 pfxdata.validity.verify_base = 1;
2124                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2125                         pfxdata.validity.hyper_pav = 1;
2126         }
2127
2128         switch (cmd) {
2129         case DASD_ECKD_CCW_READ_TRACK_DATA:
2130                 dedata->mask.perm = 0x1;
2131                 dedata->attributes.operation = basepriv->attrib.operation;
2132                 dedata->blk_size = blksize;
2133                 dedata->ga_extended |= 0x42;
2134                 lredata->operation.orientation = 0x0;
2135                 lredata->operation.operation = 0x0C;
2136                 lredata->auxiliary.check_bytes = 0x01;
2137                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2138                 break;
2139         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2140                 dedata->mask.perm = 0x02;
2141                 dedata->attributes.operation = basepriv->attrib.operation;
2142                 dedata->blk_size = blksize;
2143                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2144                 dedata->ga_extended |= 0x42;
2145                 lredata->operation.orientation = 0x0;
2146                 lredata->operation.operation = 0x3F;
2147                 lredata->extended_operation = 0x23;
2148                 lredata->auxiliary.check_bytes = 0x2;
2149                 pfx_cmd = DASD_ECKD_CCW_PFX;
2150                 break;
2151         default:
2152                 DBF_DEV_EVENT(DBF_ERR, basedev,
2153                               "prepare itcw, unknown opcode 0x%x", cmd);
2154                 BUG();
2155                 break;
2156         }
2157         if (rc)
2158                 return rc;
2159
2160         dedata->attributes.mode = 0x3;  /* ECKD */
2161
2162         heads = basepriv->rdc_data.trk_per_cyl;
2163         begcyl = trk / heads;
2164         beghead = trk % heads;
2165         endcyl = totrk / heads;
2166         endhead = totrk % heads;
2167
2168         /* check for sequential prestage - enhance cylinder range */
2169         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2170             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2171
2172                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2173                         endcyl += basepriv->attrib.nr_cyl;
2174                 else
2175                         endcyl = (basepriv->real_cyl - 1);
2176         }
2177
2178         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2179         set_ch_t(&dedata->end_ext, endcyl, endhead);
2180
2181         dedata->ep_format = 0x20; /* records per track is valid */
2182         dedata->ep_rec_per_track = blk_per_trk;
2183
2184         if (rec_on_trk) {
2185                 switch (basepriv->rdc_data.dev_type) {
2186                 case 0x3390:
2187                         dn = ceil_quot(blksize + 6, 232);
2188                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2189                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2190                         break;
2191                 case 0x3380:
2192                         d = 7 + ceil_quot(blksize + 12, 32);
2193                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2194                         break;
2195                 }
2196         }
2197
2198         lredata->auxiliary.length_valid = 1;
2199         lredata->auxiliary.length_scope = 1;
2200         lredata->auxiliary.imbedded_ccw_valid = 1;
2201         lredata->length = tlf;
2202         lredata->imbedded_ccw = cmd;
2203         lredata->count = count;
2204         lredata->sector = sector;
2205         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2206         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2207         lredata->search_arg.head = lredata->seek_addr.head;
2208         lredata->search_arg.record = rec_on_trk;
2209
2210         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2211                      &pfxdata, sizeof(pfxdata), total_data_size);
2212
2213         return rc;
2214 }
2215
2216 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2217                                                struct dasd_device *startdev,
2218                                                struct dasd_block *block,
2219                                                struct request *req,
2220                                                sector_t first_rec,
2221                                                sector_t last_rec,
2222                                                sector_t first_trk,
2223                                                sector_t last_trk,
2224                                                unsigned int first_offs,
2225                                                unsigned int last_offs,
2226                                                unsigned int blk_per_trk,
2227                                                unsigned int blksize)
2228 {
2229         struct dasd_eckd_private *private;
2230         struct dasd_ccw_req *cqr;
2231         struct req_iterator iter;
2232         struct bio_vec *bv;
2233         char *dst;
2234         unsigned int trkcount, ctidaw;
2235         unsigned char cmd;
2236         struct dasd_device *basedev;
2237         unsigned int tlf;
2238         struct itcw *itcw;
2239         struct tidaw *last_tidaw = NULL;
2240         int itcw_op;
2241         size_t itcw_size;
2242
2243         basedev = block->base;
2244         private = (struct dasd_eckd_private *) basedev->private;
2245         if (rq_data_dir(req) == READ) {
2246                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2247                 itcw_op = ITCW_OP_READ;
2248         } else if (rq_data_dir(req) == WRITE) {
2249                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2250                 itcw_op = ITCW_OP_WRITE;
2251         } else
2252                 return ERR_PTR(-EINVAL);
2253
2254         /* trackbased I/O needs address all memory via TIDAWs,
2255          * not just for 64 bit addresses. This allows us to map
2256          * each segment directly to one tidaw.
2257          */
2258         trkcount = last_trk - first_trk + 1;
2259         ctidaw = 0;
2260         rq_for_each_segment(bv, req, iter) {
2261                 ++ctidaw;
2262         }
2263
2264         /* Allocate the ccw request. */
2265         itcw_size = itcw_calc_size(0, ctidaw, 0);
2266         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2267                                    0, itcw_size, startdev);
2268         if (IS_ERR(cqr))
2269                 return cqr;
2270
2271         cqr->cpmode = 1;
2272         cqr->startdev = startdev;
2273         cqr->memdev = startdev;
2274         cqr->block = block;
2275         cqr->expires = 100*HZ;
2276         cqr->buildclk = get_clock();
2277         cqr->status = DASD_CQR_FILLED;
2278         cqr->retries = 10;
2279
2280         /* transfer length factor: how many bytes to read from the last track */
2281         if (first_trk == last_trk)
2282                 tlf = last_offs - first_offs + 1;
2283         else
2284                 tlf = last_offs + 1;
2285         tlf *= blksize;
2286
2287         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2288         cqr->cpaddr = itcw_get_tcw(itcw);
2289
2290         if (prepare_itcw(itcw, first_trk, last_trk,
2291                          cmd, basedev, startdev,
2292                          first_offs + 1,
2293                          trkcount, blksize,
2294                          (last_rec - first_rec + 1) * blksize,
2295                          tlf, blk_per_trk) == -EAGAIN) {
2296                 /* Clock not in sync and XRC is enabled.
2297                  * Try again later.
2298                  */
2299                 dasd_sfree_request(cqr, startdev);
2300                 return ERR_PTR(-EAGAIN);
2301         }
2302
2303         /*
2304          * A tidaw can address 4k of memory, but must not cross page boundaries
2305          * We can let the block layer handle this by setting
2306          * blk_queue_segment_boundary to page boundaries and
2307          * blk_max_segment_size to page size when setting up the request queue.
2308          */
2309         rq_for_each_segment(bv, req, iter) {
2310                 dst = page_address(bv->bv_page) + bv->bv_offset;
2311                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2312                 if (IS_ERR(last_tidaw))
2313                         return (struct dasd_ccw_req *)last_tidaw;
2314         }
2315
2316         last_tidaw->flags |= 0x80;
2317         itcw_finalize(itcw);
2318
2319         if (blk_noretry_request(req) ||
2320             block->base->features & DASD_FEATURE_FAILFAST)
2321                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2322         cqr->startdev = startdev;
2323         cqr->memdev = startdev;
2324         cqr->block = block;
2325         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2326         cqr->lpm = private->path_data.ppm;
2327         cqr->retries = 256;
2328         cqr->buildclk = get_clock();
2329         cqr->status = DASD_CQR_FILLED;
2330         return cqr;
2331 }
2332
2333 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2334                                                struct dasd_block *block,
2335                                                struct request *req)
2336 {
2337         int tpm, cmdrtd, cmdwtd;
2338         int use_prefix;
2339
2340         struct dasd_eckd_private *private;
2341         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2342         struct dasd_device *basedev;
2343         sector_t first_rec, last_rec;
2344         sector_t first_trk, last_trk;
2345         unsigned int first_offs, last_offs;
2346         unsigned int blk_per_trk, blksize;
2347         int cdlspecial;
2348         struct dasd_ccw_req *cqr;
2349
2350         basedev = block->base;
2351         private = (struct dasd_eckd_private *) basedev->private;
2352
2353         /* Calculate number of blocks/records per track. */
2354         blksize = block->bp_block;
2355         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2356         /* Calculate record id of first and last block. */
2357         first_rec = first_trk = req->sector >> block->s2b_shift;
2358         first_offs = sector_div(first_trk, blk_per_trk);
2359         last_rec = last_trk =
2360                 (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
2361         last_offs = sector_div(last_trk, blk_per_trk);
2362         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2363
2364         /* is transport mode supported ? */
2365         fcx_in_css = css_general_characteristics.fcx;
2366         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2367         fcx_in_features = private->features.feature[40] & 0x80;
2368         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2369
2370         /* is read track data and write track data in command mode supported? */
2371         cmdrtd = private->features.feature[9] & 0x20;
2372         cmdwtd = private->features.feature[12] & 0x40;
2373         use_prefix = private->features.feature[8] & 0x01;
2374
2375         cqr = NULL;
2376         if (cdlspecial || dasd_page_cache) {
2377                 /* do nothing, just fall through to the cmd mode single case */
2378         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2379                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2380                                                     first_rec, last_rec,
2381                                                     first_trk, last_trk,
2382                                                     first_offs, last_offs,
2383                                                     blk_per_trk, blksize);
2384                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2385                         cqr = NULL;
2386         } else if (use_prefix &&
2387                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2388                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2389                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2390                                                    first_rec, last_rec,
2391                                                    first_trk, last_trk,
2392                                                    first_offs, last_offs,
2393                                                    blk_per_trk, blksize);
2394                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2395                         cqr = NULL;
2396         }
2397         if (!cqr)
2398                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2399                                                     first_rec, last_rec,
2400                                                     first_trk, last_trk,
2401                                                     first_offs, last_offs,
2402                                                     blk_per_trk, blksize);
2403         return cqr;
2404 }
2405
2406 static int
2407 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2408 {
2409         struct dasd_eckd_private *private;
2410         struct ccw1 *ccw;
2411         struct req_iterator iter;
2412         struct bio_vec *bv;
2413         char *dst, *cda;
2414         unsigned int blksize, blk_per_trk, off;
2415         sector_t recid;
2416         int status;
2417
2418         if (!dasd_page_cache)
2419                 goto out;
2420         private = (struct dasd_eckd_private *) cqr->block->base->private;
2421         blksize = cqr->block->bp_block;
2422         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2423         recid = req->sector >> cqr->block->s2b_shift;
2424         ccw = cqr->cpaddr;
2425         /* Skip over define extent & locate record. */
2426         ccw++;
2427         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2428                 ccw++;
2429         rq_for_each_segment(bv, req, iter) {
2430                 dst = page_address(bv->bv_page) + bv->bv_offset;
2431                 for (off = 0; off < bv->bv_len; off += blksize) {
2432                         /* Skip locate record. */
2433                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2434                                 ccw++;
2435                         if (dst) {
2436                                 if (ccw->flags & CCW_FLAG_IDA)
2437                                         cda = *((char **)((addr_t) ccw->cda));
2438                                 else
2439                                         cda = (char *)((addr_t) ccw->cda);
2440                                 if (dst != cda) {
2441                                         if (rq_data_dir(req) == READ)
2442                                                 memcpy(dst, cda, bv->bv_len);
2443                                         kmem_cache_free(dasd_page_cache,
2444                                             (void *)((addr_t)cda & PAGE_MASK));
2445                                 }
2446                                 dst = NULL;
2447                         }
2448                         ccw++;
2449                         recid++;
2450                 }
2451         }
2452 out:
2453         status = cqr->status == DASD_CQR_DONE;
2454         dasd_sfree_request(cqr, cqr->memdev);
2455         return status;
2456 }
2457
2458 /*
2459  * Modify ccw/tcw in cqr so it can be started on a base device.
2460  *
2461  * Note that this is not enough to restart the cqr!
2462  * Either reset cqr->startdev as well (summary unit check handling)
2463  * or restart via separate cqr (as in ERP handling).
2464  */
2465 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2466 {
2467         struct ccw1 *ccw;
2468         struct PFX_eckd_data *pfxdata;
2469         struct tcw *tcw;
2470         struct tccb *tccb;
2471         struct dcw *dcw;
2472
2473         if (cqr->cpmode == 1) {
2474                 tcw = cqr->cpaddr;
2475                 tccb = tcw_get_tccb(tcw);
2476                 dcw = (struct dcw *)&tccb->tca[0];
2477                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2478                 pfxdata->validity.verify_base = 0;
2479                 pfxdata->validity.hyper_pav = 0;
2480         } else {
2481                 ccw = cqr->cpaddr;
2482                 pfxdata = cqr->data;
2483                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2484                         pfxdata->validity.verify_base = 0;
2485                         pfxdata->validity.hyper_pav = 0;
2486                 }
2487         }
2488 }
2489
2490 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2491
2492 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2493                                                      struct dasd_block *block,
2494                                                      struct request *req)
2495 {
2496         struct dasd_eckd_private *private;
2497         struct dasd_device *startdev;
2498         unsigned long flags;
2499         struct dasd_ccw_req *cqr;
2500
2501         startdev = dasd_alias_get_start_dev(base);
2502         if (!startdev)
2503                 startdev = base;
2504         private = (struct dasd_eckd_private *) startdev->private;
2505         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2506                 return ERR_PTR(-EBUSY);
2507
2508         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2509         private->count++;
2510         cqr = dasd_eckd_build_cp(startdev, block, req);
2511         if (IS_ERR(cqr))
2512                 private->count--;
2513         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2514         return cqr;
2515 }
2516
2517 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2518                                    struct request *req)
2519 {
2520         struct dasd_eckd_private *private;
2521         unsigned long flags;
2522
2523         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2524         private = (struct dasd_eckd_private *) cqr->memdev->private;
2525         private->count--;
2526         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2527         return dasd_eckd_free_cp(cqr, req);
2528 }
2529
2530 static int
2531 dasd_eckd_fill_info(struct dasd_device * device,
2532                     struct dasd_information2_t * info)
2533 {
2534         struct dasd_eckd_private *private;
2535
2536         private = (struct dasd_eckd_private *) device->private;
2537         info->label_block = 2;
2538         info->FBA_layout = private->uses_cdl ? 0 : 1;
2539         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2540         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2541         memcpy(info->characteristics, &private->rdc_data,
2542                sizeof(struct dasd_eckd_characteristics));
2543         info->confdata_size = min((unsigned long)private->conf_len,
2544                                   sizeof(info->configuration_data));
2545         memcpy(info->configuration_data, private->conf_data,
2546                info->confdata_size);
2547         return 0;
2548 }
2549
2550 /*
2551  * SECTION: ioctl functions for eckd devices.
2552  */
2553
2554 /*
2555  * Release device ioctl.
2556  * Buils a channel programm to releases a prior reserved
2557  * (see dasd_eckd_reserve) device.
2558  */
2559 static int
2560 dasd_eckd_release(struct dasd_device *device)
2561 {
2562         struct dasd_ccw_req *cqr;
2563         int rc;
2564         struct ccw1 *ccw;
2565
2566         if (!capable(CAP_SYS_ADMIN))
2567                 return -EACCES;
2568
2569         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2570                                    1, 32, device);
2571         if (IS_ERR(cqr)) {
2572                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2573                             "Could not allocate initialization request");
2574                 return PTR_ERR(cqr);
2575         }
2576         ccw = cqr->cpaddr;
2577         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2578         ccw->flags |= CCW_FLAG_SLI;
2579         ccw->count = 32;
2580         ccw->cda = (__u32)(addr_t) cqr->data;
2581         cqr->startdev = device;
2582         cqr->memdev = device;
2583         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2584         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2585         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2586         cqr->expires = 2 * HZ;
2587         cqr->buildclk = get_clock();
2588         cqr->status = DASD_CQR_FILLED;
2589
2590         rc = dasd_sleep_on_immediatly(cqr);
2591
2592         dasd_sfree_request(cqr, cqr->memdev);
2593         return rc;
2594 }
2595
2596 /*
2597  * Reserve device ioctl.
2598  * Options are set to 'synchronous wait for interrupt' and
2599  * 'timeout the request'. This leads to a terminate IO if
2600  * the interrupt is outstanding for a certain time.
2601  */
2602 static int
2603 dasd_eckd_reserve(struct dasd_device *device)
2604 {
2605         struct dasd_ccw_req *cqr;
2606         int rc;
2607         struct ccw1 *ccw;
2608
2609         if (!capable(CAP_SYS_ADMIN))
2610                 return -EACCES;
2611
2612         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2613                                    1, 32, device);
2614         if (IS_ERR(cqr)) {
2615                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2616                             "Could not allocate initialization request");
2617                 return PTR_ERR(cqr);
2618         }
2619         ccw = cqr->cpaddr;
2620         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2621         ccw->flags |= CCW_FLAG_SLI;
2622         ccw->count = 32;
2623         ccw->cda = (__u32)(addr_t) cqr->data;
2624         cqr->startdev = device;
2625         cqr->memdev = device;
2626         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2627         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2628         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2629         cqr->expires = 2 * HZ;
2630         cqr->buildclk = get_clock();
2631         cqr->status = DASD_CQR_FILLED;
2632
2633         rc = dasd_sleep_on_immediatly(cqr);
2634
2635         dasd_sfree_request(cqr, cqr->memdev);
2636         return rc;
2637 }
2638
2639 /*
2640  * Steal lock ioctl - unconditional reserve device.
2641  * Buils a channel programm to break a device's reservation.
2642  * (unconditional reserve)
2643  */
2644 static int
2645 dasd_eckd_steal_lock(struct dasd_device *device)
2646 {
2647         struct dasd_ccw_req *cqr;
2648         int rc;
2649         struct ccw1 *ccw;
2650
2651         if (!capable(CAP_SYS_ADMIN))
2652                 return -EACCES;
2653
2654         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2655                                    1, 32, device);
2656         if (IS_ERR(cqr)) {
2657                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2658                             "Could not allocate initialization request");
2659                 return PTR_ERR(cqr);
2660         }
2661         ccw = cqr->cpaddr;
2662         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2663         ccw->flags |= CCW_FLAG_SLI;
2664         ccw->count = 32;
2665         ccw->cda = (__u32)(addr_t) cqr->data;
2666         cqr->startdev = device;
2667         cqr->memdev = device;
2668         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2669         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2670         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2671         cqr->expires = 2 * HZ;
2672         cqr->buildclk = get_clock();
2673         cqr->status = DASD_CQR_FILLED;
2674
2675         rc = dasd_sleep_on_immediatly(cqr);
2676
2677         dasd_sfree_request(cqr, cqr->memdev);
2678         return rc;
2679 }
2680
2681 /*
2682  * Read performance statistics
2683  */
2684 static int
2685 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2686 {
2687         struct dasd_psf_prssd_data *prssdp;
2688         struct dasd_rssd_perf_stats_t *stats;
2689         struct dasd_ccw_req *cqr;
2690         struct ccw1 *ccw;
2691         int rc;
2692
2693         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2694                                    1 /* PSF */  + 1 /* RSSD */ ,
2695                                    (sizeof(struct dasd_psf_prssd_data) +
2696                                     sizeof(struct dasd_rssd_perf_stats_t)),
2697                                    device);
2698         if (IS_ERR(cqr)) {
2699                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2700                             "Could not allocate initialization request");
2701                 return PTR_ERR(cqr);
2702         }
2703         cqr->startdev = device;
2704         cqr->memdev = device;
2705         cqr->retries = 0;
2706         cqr->expires = 10 * HZ;
2707
2708         /* Prepare for Read Subsystem Data */
2709         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2710         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2711         prssdp->order = PSF_ORDER_PRSSD;
2712         prssdp->suborder = 0x01;        /* Performance Statistics */
2713         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2714
2715         ccw = cqr->cpaddr;
2716         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2717         ccw->count = sizeof(struct dasd_psf_prssd_data);
2718         ccw->flags |= CCW_FLAG_CC;
2719         ccw->cda = (__u32)(addr_t) prssdp;
2720
2721         /* Read Subsystem Data - Performance Statistics */
2722         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2723         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2724
2725         ccw++;
2726         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2727         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2728         ccw->cda = (__u32)(addr_t) stats;
2729
2730         cqr->buildclk = get_clock();
2731         cqr->status = DASD_CQR_FILLED;
2732         rc = dasd_sleep_on(cqr);
2733         if (rc == 0) {
2734                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2735                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2736                 if (copy_to_user(argp, stats,
2737                                  sizeof(struct dasd_rssd_perf_stats_t)))
2738                         rc = -EFAULT;
2739         }
2740         dasd_sfree_request(cqr, cqr->memdev);
2741         return rc;
2742 }
2743
2744 /*
2745  * Get attributes (cache operations)
2746  * Returnes the cache attributes used in Define Extend (DE).
2747  */
2748 static int
2749 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2750 {
2751         struct dasd_eckd_private *private =
2752                 (struct dasd_eckd_private *)device->private;
2753         struct attrib_data_t attrib = private->attrib;
2754         int rc;
2755
2756         if (!capable(CAP_SYS_ADMIN))
2757                 return -EACCES;
2758         if (!argp)
2759                 return -EINVAL;
2760
2761         rc = 0;
2762         if (copy_to_user(argp, (long *) &attrib,
2763                          sizeof(struct attrib_data_t)))
2764                 rc = -EFAULT;
2765
2766         return rc;
2767 }
2768
2769 /*
2770  * Set attributes (cache operations)
2771  * Stores the attributes for cache operation to be used in Define Extend (DE).
2772  */
2773 static int
2774 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2775 {
2776         struct dasd_eckd_private *private =
2777                 (struct dasd_eckd_private *)device->private;
2778         struct attrib_data_t attrib;
2779
2780         if (!capable(CAP_SYS_ADMIN))
2781                 return -EACCES;
2782         if (!argp)
2783                 return -EINVAL;
2784
2785         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2786                 return -EFAULT;
2787         private->attrib = attrib;
2788
2789         dev_info(&device->cdev->dev,
2790                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2791                  private->attrib.operation, private->attrib.nr_cyl);
2792         return 0;
2793 }
2794
2795 /*
2796  * Issue syscall I/O to EMC Symmetrix array.
2797  * CCWs are PSF and RSSD
2798  */
2799 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2800 {
2801         struct dasd_symmio_parms usrparm;
2802         char *psf_data, *rssd_result;
2803         struct dasd_ccw_req *cqr;
2804         struct ccw1 *ccw;
2805         int rc;
2806
2807         /* Copy parms from caller */
2808         rc = -EFAULT;
2809         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2810                 goto out;
2811 #ifndef CONFIG_64BIT
2812         /* Make sure pointers are sane even on 31 bit. */
2813         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2814                 rc = -EINVAL;
2815                 goto out;
2816         }
2817 #endif
2818         /* alloc I/O data area */
2819         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2820         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2821         if (!psf_data || !rssd_result) {
2822                 rc = -ENOMEM;
2823                 goto out_free;
2824         }
2825
2826         /* get syscall header from user space */
2827         rc = -EFAULT;
2828         if (copy_from_user(psf_data,
2829                            (void __user *)(unsigned long) usrparm.psf_data,
2830                            usrparm.psf_data_len))
2831                 goto out_free;
2832
2833         /* sanity check on syscall header */
2834         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2835                 rc = -EINVAL;
2836                 goto out_free;
2837         }
2838
2839         /* setup CCWs for PSF + RSSD */
2840         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2841         if (IS_ERR(cqr)) {
2842                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2843                         "Could not allocate initialization request");
2844                 rc = PTR_ERR(cqr);
2845                 goto out_free;
2846         }
2847
2848         cqr->startdev = device;
2849         cqr->memdev = device;
2850         cqr->retries = 3;
2851         cqr->expires = 10 * HZ;
2852         cqr->buildclk = get_clock();
2853         cqr->status = DASD_CQR_FILLED;
2854
2855         /* Build the ccws */
2856         ccw = cqr->cpaddr;
2857
2858         /* PSF ccw */
2859         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2860         ccw->count = usrparm.psf_data_len;
2861         ccw->flags |= CCW_FLAG_CC;
2862         ccw->cda = (__u32)(addr_t) psf_data;
2863
2864         ccw++;
2865
2866         /* RSSD ccw  */
2867         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2868         ccw->count = usrparm.rssd_result_len;
2869         ccw->flags = CCW_FLAG_SLI ;
2870         ccw->cda = (__u32)(addr_t) rssd_result;
2871
2872         rc = dasd_sleep_on(cqr);
2873         if (rc)
2874                 goto out_sfree;
2875
2876         rc = -EFAULT;
2877         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2878                            rssd_result, usrparm.rssd_result_len))
2879                 goto out_sfree;
2880         rc = 0;
2881
2882 out_sfree:
2883         dasd_sfree_request(cqr, cqr->memdev);
2884 out_free:
2885         kfree(rssd_result);
2886         kfree(psf_data);
2887 out:
2888         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2889         return rc;
2890 }
2891
2892 static int
2893 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2894 {
2895         struct dasd_device *device = block->base;
2896
2897         switch (cmd) {
2898         case BIODASDGATTR:
2899                 return dasd_eckd_get_attrib(device, argp);
2900         case BIODASDSATTR:
2901                 return dasd_eckd_set_attrib(device, argp);
2902         case BIODASDPSRD:
2903                 return dasd_eckd_performance(device, argp);
2904         case BIODASDRLSE:
2905                 return dasd_eckd_release(device);
2906         case BIODASDRSRV:
2907                 return dasd_eckd_reserve(device);
2908         case BIODASDSLCK:
2909                 return dasd_eckd_steal_lock(device);
2910         case BIODASDSYMMIO:
2911                 return dasd_symm_io(device, argp);
2912         default:
2913                 return -ENOIOCTLCMD;
2914         }
2915 }
2916
2917 /*
2918  * Dump the range of CCWs into 'page' buffer
2919  * and return number of printed chars.
2920  */
2921 static int
2922 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2923 {
2924         int len, count;
2925         char *datap;
2926
2927         len = 0;
2928         while (from <= to) {
2929                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2930                                " CCW %p: %08X %08X DAT:",
2931                                from, ((int *) from)[0], ((int *) from)[1]);
2932
2933                 /* get pointer to data (consider IDALs) */
2934                 if (from->flags & CCW_FLAG_IDA)
2935                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2936                 else
2937                         datap = (char *) ((addr_t) from->cda);
2938
2939                 /* dump data (max 32 bytes) */
2940                 for (count = 0; count < from->count && count < 32; count++) {
2941                         if (count % 8 == 0) len += sprintf(page + len, " ");
2942                         if (count % 4 == 0) len += sprintf(page + len, " ");
2943                         len += sprintf(page + len, "%02x", datap[count]);
2944                 }
2945                 len += sprintf(page + len, "\n");
2946                 from++;
2947         }
2948         return len;
2949 }
2950
2951 static void
2952 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
2953                          struct irb *irb, char *reason)
2954 {
2955         u64 *sense;
2956         int sl;
2957         struct tsb *tsb;
2958
2959         sense = NULL;
2960         tsb = NULL;
2961         if (req && scsw_is_tm(&req->irb.scsw)) {
2962                 if (irb->scsw.tm.tcw)
2963                         tsb = tcw_get_tsb(
2964                                 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
2965                 if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
2966                         switch (tsb->flags & 0x07) {
2967                         case 1: /* tsa_iostat */
2968                                 sense = (u64 *)tsb->tsa.iostat.sense;
2969                         break;
2970                         case 2: /* ts_ddpc */
2971                                 sense = (u64 *)tsb->tsa.ddpc.sense;
2972                         break;
2973                         case 3: /* tsa_intrg */
2974                         break;
2975                         }
2976                 }
2977         } else {
2978                 if (irb->esw.esw0.erw.cons)
2979                         sense = (u64 *)irb->ecw;
2980         }
2981         if (sense) {
2982                 for (sl = 0; sl < 4; sl++) {
2983                         DBF_DEV_EVENT(DBF_EMERG, device,
2984                                       "%s: %016llx %016llx %016llx %016llx",
2985                                       reason, sense[0], sense[1], sense[2],
2986                                       sense[3]);
2987                 }
2988         } else {
2989                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2990                               "SORRY - NO VALID SENSE AVAILABLE\n");
2991         }
2992 }
2993
2994 /*
2995  * Print sense data and related channel program.
2996  * Parts are printed because printk buffer is only 1024 bytes.
2997  */
2998 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
2999                                  struct dasd_ccw_req *req, struct irb *irb)
3000 {
3001         char *page;
3002         struct ccw1 *first, *last, *fail, *from, *to;
3003         int len, sl, sct;
3004
3005         page = (char *) get_zeroed_page(GFP_ATOMIC);
3006         if (page == NULL) {
3007                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3008                               "No memory to dump sense data\n");
3009                 return;
3010         }
3011         /* dump the sense data */
3012         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3013                       " I/O status report for device %s:\n",
3014                       dev_name(&device->cdev->dev));
3015         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3016                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
3017                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw));
3018         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3019                        " device %s: Failing CCW: %p\n",
3020                        dev_name(&device->cdev->dev),
3021                        (void *) (addr_t) irb->scsw.cmd.cpa);
3022         if (irb->esw.esw0.erw.cons) {
3023                 for (sl = 0; sl < 4; sl++) {
3024                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3025                                        " Sense(hex) %2d-%2d:",
3026                                        (8 * sl), ((8 * sl) + 7));
3027
3028                         for (sct = 0; sct < 8; sct++) {
3029                                 len += sprintf(page + len, " %02x",
3030                                                irb->ecw[8 * sl + sct]);
3031                         }
3032                         len += sprintf(page + len, "\n");
3033                 }
3034
3035                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3036                         /* 24 Byte Sense Data */
3037                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3038                                 " 24 Byte: %x MSG %x, "
3039                                 "%s MSGb to SYSOP\n",
3040                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3041                                 irb->ecw[1] & 0x10 ? "" : "no");
3042                 } else {
3043                         /* 32 Byte Sense Data */
3044                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3045                                 " 32 Byte: Format: %x "
3046                                 "Exception class %x\n",
3047                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3048                 }
3049         } else {
3050                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3051                         " SORRY - NO VALID SENSE AVAILABLE\n");
3052         }
3053         printk("%s", page);
3054
3055         if (req) {
3056                 /* req == NULL for unsolicited interrupts */
3057                 /* dump the Channel Program (max 140 Bytes per line) */
3058                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3059                 first = req->cpaddr;
3060                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3061                 to = min(first + 6, last);
3062                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3063                               " Related CP in req: %p\n", req);
3064                 dasd_eckd_dump_ccw_range(first, to, page + len);
3065                 printk("%s", page);
3066
3067                 /* print failing CCW area (maximum 4) */
3068                 /* scsw->cda is either valid or zero  */
3069                 len = 0;
3070                 from = ++to;
3071                 fail = (struct ccw1 *)(addr_t)
3072                                 irb->scsw.cmd.cpa; /* failing CCW */
3073                 if (from <  fail - 2) {
3074                         from = fail - 2;     /* there is a gap - print header */
3075                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3076                 }
3077                 to = min(fail + 1, last);
3078                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3079
3080                 /* print last CCWs (maximum 2) */
3081                 from = max(from, ++to);
3082                 if (from < last - 1) {
3083                         from = last - 1;     /* there is a gap - print header */
3084                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3085                 }
3086                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3087                 if (len > 0)
3088                         printk("%s", page);
3089         }
3090         free_page((unsigned long) page);
3091 }
3092
3093
3094 /*
3095  * Print sense data from a tcw.
3096  */
3097 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3098                                  struct dasd_ccw_req *req, struct irb *irb)
3099 {
3100         char *page;
3101         int len, sl, sct, residual;
3102
3103         struct tsb *tsb;
3104         u8 *sense;
3105
3106
3107         page = (char *) get_zeroed_page(GFP_ATOMIC);
3108         if (page == NULL) {
3109                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3110                             "No memory to dump sense data");
3111                 return;
3112         }
3113         /* dump the sense data */
3114         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3115                       " I/O status report for device %s:\n",
3116                       dev_name(&device->cdev->dev));
3117         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3118                        " in req: %p CS: 0x%02X DS: 0x%02X "
3119                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3120                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3121                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3122         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3123                        " device %s: Failing TCW: %p\n",
3124                        dev_name(&device->cdev->dev),
3125                        (void *) (addr_t) irb->scsw.tm.tcw);
3126
3127         tsb = NULL;
3128         sense = NULL;
3129         if (irb->scsw.tm.tcw)
3130                 tsb = tcw_get_tsb(
3131                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3132
3133         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3134                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3135                                " tsb->length %d\n", tsb->length);
3136                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3137                                " tsb->flags %x\n", tsb->flags);
3138                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3139                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3140                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3141                                " tsb->count %d\n", tsb->count);
3142                 residual = tsb->count - 28;
3143                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3144                                " residual %d\n", residual);
3145
3146                 switch (tsb->flags & 0x07) {
3147                 case 1: /* tsa_iostat */
3148                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3149                                " tsb->tsa.iostat.dev_time %d\n",
3150                                        tsb->tsa.iostat.dev_time);
3151                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3152                                " tsb->tsa.iostat.def_time %d\n",
3153                                        tsb->tsa.iostat.def_time);
3154                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3155                                " tsb->tsa.iostat.queue_time %d\n",
3156                                        tsb->tsa.iostat.queue_time);
3157                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3158                                " tsb->tsa.iostat.dev_busy_time %d\n",
3159                                        tsb->tsa.iostat.dev_busy_time);
3160                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3161                                " tsb->tsa.iostat.dev_act_time %d\n",
3162                                        tsb->tsa.iostat.dev_act_time);
3163                         sense = tsb->tsa.iostat.sense;
3164                         break;
3165                 case 2: /* ts_ddpc */
3166                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3167                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3168                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3169                                " tsb->tsa.ddpc.rcq:  ");
3170                         for (sl = 0; sl < 16; sl++) {
3171                                 for (sct = 0; sct < 8; sct++) {
3172                                         len += sprintf(page + len, " %02x",
3173                                                        tsb->tsa.ddpc.rcq[sl]);
3174                                 }
3175                                 len += sprintf(page + len, "\n");
3176                         }
3177                         sense = tsb->tsa.ddpc.sense;
3178                         break;
3179                 case 3: /* tsa_intrg */
3180                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3181                                       " tsb->tsa.intrg.: not supportet yet \n");
3182                         break;
3183                 }
3184
3185                 if (sense) {
3186                         for (sl = 0; sl < 4; sl++) {
3187                                 len += sprintf(page + len,
3188                                                KERN_ERR PRINTK_HEADER
3189                                                " Sense(hex) %2d-%2d:",
3190                                                (8 * sl), ((8 * sl) + 7));
3191                                 for (sct = 0; sct < 8; sct++) {
3192                                         len += sprintf(page + len, " %02x",
3193                                                        sense[8 * sl + sct]);
3194                                 }
3195                                 len += sprintf(page + len, "\n");
3196                         }
3197
3198                         if (sense[27] & DASD_SENSE_BIT_0) {
3199                                 /* 24 Byte Sense Data */
3200                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3201                                         " 24 Byte: %x MSG %x, "
3202                                         "%s MSGb to SYSOP\n",
3203                                         sense[7] >> 4, sense[7] & 0x0f,
3204                                         sense[1] & 0x10 ? "" : "no");
3205                         } else {
3206                                 /* 32 Byte Sense Data */
3207                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3208                                         " 32 Byte: Format: %x "
3209                                         "Exception class %x\n",
3210                                         sense[6] & 0x0f, sense[22] >> 4);
3211                         }
3212                 } else {
3213                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3214                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3215                 }
3216         } else {
3217                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3218                         " SORRY - NO TSB DATA AVAILABLE\n");
3219         }
3220         printk("%s", page);
3221         free_page((unsigned long) page);
3222 }
3223
3224 static void dasd_eckd_dump_sense(struct dasd_device *device,
3225                                  struct dasd_ccw_req *req, struct irb *irb)
3226 {
3227         if (req && scsw_is_tm(&req->irb.scsw))
3228                 dasd_eckd_dump_sense_tcw(device, req, irb);
3229         else
3230                 dasd_eckd_dump_sense_ccw(device, req, irb);
3231 }
3232
3233
3234 /*
3235  * max_blocks is dependent on the amount of storage that is available
3236  * in the static io buffer for each device. Currently each device has
3237  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3238  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3239  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3240  * addition we have one define extent ccw + 16 bytes of data and one
3241  * locate record ccw + 16 bytes of data. That makes:
3242  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3243  * We want to fit two into the available memory so that we can immediately
3244  * start the next request if one finishes off. That makes 249.5 blocks
3245  * for one request. Give a little safety and the result is 240.
3246  */
3247 static struct dasd_discipline dasd_eckd_discipline = {
3248         .owner = THIS_MODULE,
3249         .name = "ECKD",
3250         .ebcname = "ECKD",
3251         .max_blocks = 240,
3252         .check_device = dasd_eckd_check_characteristics,
3253         .uncheck_device = dasd_eckd_uncheck_device,
3254         .do_analysis = dasd_eckd_do_analysis,
3255         .ready_to_online = dasd_eckd_ready_to_online,
3256         .online_to_ready = dasd_eckd_online_to_ready,
3257         .fill_geometry = dasd_eckd_fill_geometry,
3258         .start_IO = dasd_start_IO,
3259         .term_IO = dasd_term_IO,
3260         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3261         .format_device = dasd_eckd_format_device,
3262         .erp_action = dasd_eckd_erp_action,
3263         .erp_postaction = dasd_eckd_erp_postaction,
3264         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3265         .build_cp = dasd_eckd_build_alias_cp,
3266         .free_cp = dasd_eckd_free_alias_cp,
3267         .dump_sense = dasd_eckd_dump_sense,
3268         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3269         .fill_info = dasd_eckd_fill_info,
3270         .ioctl = dasd_eckd_ioctl,
3271 };
3272
3273 static int __init
3274 dasd_eckd_init(void)
3275 {
3276         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3277         return ccw_driver_register(&dasd_eckd_driver);
3278 }
3279
3280 static void __exit
3281 dasd_eckd_cleanup(void)
3282 {
3283         ccw_driver_unregister(&dasd_eckd_driver);
3284 }
3285
3286 module_init(dasd_eckd_init);
3287 module_exit(dasd_eckd_cleanup);