drivers/s390/block/dasd_diag.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Based on.......: linux/drivers/s390/block/mdisk.c
   5  * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2000
   8  *
   9  */
  10
  11 #include <linux/kernel_stat.h>
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/jiffies.h>
  20 #include <asm/asm-extable.h>
  21 #include <asm/dasd.h>
  22 #include <asm/debug.h>
  23 #include <asm/diag.h>
  24 #include <asm/ebcdic.h>
  25 #include <linux/io.h>
  26 #include <asm/irq.h>
  27 #include <asm/vtoc.h>
  28
  29 #include "dasd_int.h"
  30 #include "dasd_diag.h"
  31
  32 MODULE_LICENSE("GPL");
  33
  34 /* The maximum number of blocks per request (max_blocks) is dependent on the
  35  * amount of storage that is available in the static I/O buffer for each
  36  * device. Currently each device gets 2 pages. We want to fit two requests
  37  * into the available memory so that we can immediately start the next if one
  38  * finishes. */
  39 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  40                            sizeof(struct dasd_diag_req)) / \
  41                            sizeof(struct dasd_diag_bio)) / 2)
  42 #define DIAG_MAX_RETRIES        32
  43 #define DIAG_TIMEOUT            50
  44
  45 static struct dasd_discipline dasd_diag_discipline;
  46
  47 struct dasd_diag_private {
  48         struct dasd_diag_characteristics rdc_data;
  49         struct dasd_diag_rw_io iob;
  50         struct dasd_diag_init_io iib;
  51         blocknum_t pt_block;
  52         struct ccw_dev_id dev_id;
  53 };
  54
  55 struct dasd_diag_req {
  56         unsigned int block_count;
  57         struct dasd_diag_bio bio[];
  58 };
  59
  60 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  61
  62 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  63  * and function code cmd.
  64  * In case of an exception return 3. Otherwise return result of bitwise OR of
  65  * resulting condition code and DIAG return code. */
  66 static inline int __dia250(void *iob, int cmd)
  67 {
  68         union register_pair rx = { .even = (unsigned long)iob, };
  69         typedef union {
  70                 struct dasd_diag_init_io init_io;
  71                 struct dasd_diag_rw_io rw_io;
  72         } addr_type;
  73         int cc;
  74
  75         cc = 3;
  76         asm volatile(
  77                 "       diag    %[rx],%[cmd],0x250\n"
  78                 "0:     ipm     %[cc]\n"
  79                 "       srl     %[cc],28\n"
  80                 "1:\n"
  81                 EX_TABLE(0b,1b)
  82                 : [cc] "+&d" (cc), [rx] "+&d" (rx.pair), "+m" (*(addr_type *)iob)
  83                 : [cmd] "d" (cmd)
  84                 : "cc");
  85         return cc | rx.odd;
  86 }
  87
  88 static inline int dia250(void *iob, int cmd)
  89 {
  90         diag_stat_inc(DIAG_STAT_X250);
  91         return __dia250(iob, cmd);
  92 }
  93
  94 /* Initialize block I/O to DIAG device using the specified blocksize and
  95  * block offset. On success, return zero and set end_block to contain the
  96  * number of blocks on the device minus the specified offset. Return non-zero
  97  * otherwise. */
  98 static inline int
  99 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
 100              blocknum_t offset, blocknum_t *end_block)
 101 {
 102         struct dasd_diag_private *private = device->private;
 103         struct dasd_diag_init_io *iib = &private->iib;
 104         int rc;
 105
 106         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 107
 108         iib->dev_nr = private->dev_id.devno;
 109         iib->block_size = blocksize;
 110         iib->offset = offset;
 111         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 112
 113         rc = dia250(iib, INIT_BIO);
 114
 115         if ((rc & 3) == 0 && end_block)
 116                 *end_block = iib->end_block;
 117
 118         return rc;
 119 }
 120
 121 /* Remove block I/O environment for device. Return zero on success, non-zero
 122  * otherwise. */
 123 static inline int
 124 mdsk_term_io(struct dasd_device * device)
 125 {
 126         struct dasd_diag_private *private = device->private;
 127         struct dasd_diag_init_io *iib = &private->iib;
 128         int rc;
 129
 130         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 131         iib->dev_nr = private->dev_id.devno;
 132         rc = dia250(iib, TERM_BIO);
 133         return rc;
 134 }
 135
 136 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 137  * environment. */
 138 static void
 139 dasd_diag_erp(struct dasd_device *device)
 140 {
 141         int rc;
 142
 143         mdsk_term_io(device);
 144         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 145         if (rc == 4) {
 146                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 147                         pr_warn("%s: The access mode of a DIAG device changed to read-only\n",
 148                                 dev_name(&device->cdev->dev));
 149                 rc = 0;
 150         }
 151         if (rc)
 152                 pr_warn("%s: DIAG ERP failed with rc=%d\n",
 153                         dev_name(&device->cdev->dev), rc);
 154 }
 155
 156 /* Start a given request at the device. Return zero on success, non-zero
 157  * otherwise. */
 158 static int
 159 dasd_start_diag(struct dasd_ccw_req * cqr)
 160 {
 161         struct dasd_device *device;
 162         struct dasd_diag_private *private;
 163         struct dasd_diag_req *dreq;
 164         int rc;
 165
 166         device = cqr->startdev;
 167         if (cqr->retries < 0) {
 168                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 169                             "- no retry left)", cqr);
 170                 cqr->status = DASD_CQR_ERROR;
 171                 return -EIO;
 172         }
 173         private = device->private;
 174         dreq = cqr->data;
 175
 176         private->iob.dev_nr = private->dev_id.devno;
 177         private->iob.key = 0;
 178         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 179         private->iob.block_count = dreq->block_count;
 180         private->iob.interrupt_params = (addr_t) cqr;
 181         private->iob.bio_list = dreq->bio;
 182         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 183
 184         cqr->startclk = get_tod_clock();
 185         cqr->starttime = jiffies;
 186         cqr->retries--;
 187
 188         rc = dia250(&private->iob, RW_BIO);
 189         switch (rc) {
 190         case 0: /* Synchronous I/O finished successfully */
 191                 cqr->stopclk = get_tod_clock();
 192                 cqr->status = DASD_CQR_SUCCESS;
 193                 /* Indicate to calling function that only a dasd_schedule_bh()
 194                    and no timer is needed */
 195                 rc = -EACCES;
 196                 break;
 197         case 8: /* Asynchronous I/O was started */
 198                 cqr->status = DASD_CQR_IN_IO;
 199                 rc = 0;
 200                 break;
 201         default: /* Error condition */
 202                 cqr->status = DASD_CQR_QUEUED;
 203                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 204                 dasd_diag_erp(device);
 205                 rc = -EIO;
 206                 break;
 207         }
 208         cqr->intrc = rc;
 209         return rc;
 210 }
 211
 212 /* Terminate given request at the device. */
 213 static int
 214 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 215 {
 216         struct dasd_device *device;
 217
 218         device = cqr->startdev;
 219         mdsk_term_io(device);
 220         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 221         cqr->status = DASD_CQR_CLEAR_PENDING;
 222         cqr->stopclk = get_tod_clock();
 223         dasd_schedule_device_bh(device);
 224         return 0;
 225 }
 226
 227 /* Handle external interruption. */
 228 static void dasd_ext_handler(struct ext_code ext_code,
 229                              unsigned int param32, unsigned long param64)
 230 {
 231         struct dasd_ccw_req *cqr, *next;
 232         struct dasd_device *device;
 233         unsigned long expires;
 234         unsigned long flags;
 235         addr_t ip;
 236         int rc;
 237
 238         switch (ext_code.subcode >> 8) {
 239         case DASD_DIAG_CODE_31BIT:
 240                 ip = (addr_t) param32;
 241                 break;
 242         case DASD_DIAG_CODE_64BIT:
 243                 ip = (addr_t) param64;
 244                 break;
 245         default:
 246                 return;
 247         }
 248         inc_irq_stat(IRQEXT_DSD);
 249         if (!ip) {              /* no intparm: unsolicited interrupt */
 250                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 251                               "interrupt");
 252                 return;
 253         }
 254         cqr = (struct dasd_ccw_req *) ip;
 255         device = (struct dasd_device *) cqr->startdev;
 256         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 257                 DBF_DEV_EVENT(DBF_WARNING, device,
 258                             " magic number of dasd_ccw_req 0x%08X doesn't"
 259                             " match discipline 0x%08X",
 260                             cqr->magic, *(int *) (&device->discipline->name));
 261                 return;
 262         }
 263
 264         /* get irq lock to modify request queue */
 265         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 266
 267         /* Check for a pending clear operation */
 268         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 269                 cqr->status = DASD_CQR_CLEARED;
 270                 dasd_device_clear_timer(device);
 271                 dasd_schedule_device_bh(device);
 272                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 273                 return;
 274         }
 275
 276         cqr->stopclk = get_tod_clock();
 277
 278         expires = 0;
 279         if ((ext_code.subcode & 0xff) == 0) {
 280                 cqr->status = DASD_CQR_SUCCESS;
 281                 /* Start first request on queue if possible -> fast_io. */
 282                 if (!list_empty(&device->ccw_queue)) {
 283                         next = list_entry(device->ccw_queue.next,
 284                                           struct dasd_ccw_req, devlist);
 285                         if (next->status == DASD_CQR_QUEUED) {
 286                                 rc = dasd_start_diag(next);
 287                                 if (rc == 0)
 288                                         expires = next->expires;
 289                         }
 290                 }
 291         } else {
 292                 cqr->status = DASD_CQR_QUEUED;
 293                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 294                               "request %p was %d (%d retries left)", cqr,
 295                               ext_code.subcode & 0xff, cqr->retries);
 296                 dasd_diag_erp(device);
 297         }
 298
 299         if (expires != 0)
 300                 dasd_device_set_timer(device, expires);
 301         else
 302                 dasd_device_clear_timer(device);
 303         dasd_schedule_device_bh(device);
 304
 305         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 306 }
 307
 308 /* Check whether device can be controlled by DIAG discipline. Return zero on
 309  * success, non-zero otherwise. */
 310 static int
 311 dasd_diag_check_device(struct dasd_device *device)
 312 {
 313         struct dasd_diag_private *private = device->private;
 314         struct dasd_diag_characteristics *rdc_data;
 315         struct vtoc_cms_label *label;
 316         struct dasd_block *block;
 317         struct dasd_diag_bio *bio;
 318         unsigned int sb, bsize;
 319         blocknum_t end_block;
 320         int rc;
 321
 322         if (private == NULL) {
 323                 private = kzalloc(sizeof(*private), GFP_KERNEL);
 324                 if (private == NULL) {
 325                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 326                                 "Allocating memory for private DASD data "
 327                                       "failed\n");
 328                         return -ENOMEM;
 329                 }
 330                 ccw_device_get_id(device->cdev, &private->dev_id);
 331                 device->private = private;
 332         }
 333         block = dasd_alloc_block();
 334         if (IS_ERR(block)) {
 335                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 336                             "could not allocate dasd block structure");
 337                 device->private = NULL;
 338                 kfree(private);
 339                 return PTR_ERR(block);
 340         }
 341         device->block = block;
 342         block->base = device;
 343
 344         /* Read Device Characteristics */
 345         rdc_data = &private->rdc_data;
 346         rdc_data->dev_nr = private->dev_id.devno;
 347         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 348
 349         rc = diag210((struct diag210 *) rdc_data);
 350         if (rc) {
 351                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 352                             "information (rc=%d)", rc);
 353                 rc = -EOPNOTSUPP;
 354                 goto out;
 355         }
 356
 357         device->default_expires = DIAG_TIMEOUT;
 358         device->default_retries = DIAG_MAX_RETRIES;
 359
 360         /* Figure out position of label block */
 361         switch (private->rdc_data.vdev_class) {
 362         case DEV_CLASS_FBA:
 363                 private->pt_block = 1;
 364                 break;
 365         case DEV_CLASS_ECKD:
 366                 private->pt_block = 2;
 367                 break;
 368         default:
 369                 pr_warn("%s: Device type %d is not supported in DIAG mode\n",
 370                         dev_name(&device->cdev->dev),
 371                         private->rdc_data.vdev_class);
 372                 rc = -EOPNOTSUPP;
 373                 goto out;
 374         }
 375
 376         DBF_DEV_EVENT(DBF_INFO, device,
 377                       "%04X: %04X on real %04X/%02X",
 378                       rdc_data->dev_nr,
 379                       rdc_data->vdev_type,
 380                       rdc_data->rdev_type, rdc_data->rdev_model);
 381
 382         /* terminate all outstanding operations */
 383         mdsk_term_io(device);
 384
 385         /* figure out blocksize of device */
 386         label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
 387         if (label == NULL)  {
 388                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 389                             "No memory to allocate initialization request");
 390                 rc = -ENOMEM;
 391                 goto out;
 392         }
 393         bio = kzalloc(sizeof(*bio), GFP_KERNEL);
 394         if (bio == NULL)  {
 395                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 396                               "No memory to allocate initialization bio");
 397                 rc = -ENOMEM;
 398                 goto out_label;
 399         }
 400         rc = 0;
 401         end_block = 0;
 402         /* try all sizes - needed for ECKD devices */
 403         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 404                 mdsk_init_io(device, bsize, 0, &end_block);
 405                 memset(bio, 0, sizeof(*bio));
 406                 bio->type = MDSK_READ_REQ;
 407                 bio->block_number = private->pt_block + 1;
 408                 bio->buffer = label;
 409                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 410                 private->iob.dev_nr = rdc_data->dev_nr;
 411                 private->iob.key = 0;
 412                 private->iob.flags = 0; /* do synchronous io */
 413                 private->iob.block_count = 1;
 414                 private->iob.interrupt_params = 0;
 415                 private->iob.bio_list = bio;
 416                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 417                 rc = dia250(&private->iob, RW_BIO);
 418                 if (rc == 3) {
 419                         pr_warn("%s: A 64-bit DIAG call failed\n",
 420                                 dev_name(&device->cdev->dev));
 421                         rc = -EOPNOTSUPP;
 422                         goto out_bio;
 423                 }
 424                 mdsk_term_io(device);
 425                 if (rc == 0)
 426                         break;
 427         }
 428         if (bsize > PAGE_SIZE) {
 429                 pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n",
 430                         dev_name(&device->cdev->dev), rc);
 431                 rc = -EIO;
 432                 goto out_bio;
 433         }
 434         /* check for label block */
 435         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 436                   sizeof(DASD_DIAG_CMS1)) == 0) {
 437                 /* get formatted blocksize from label block */
 438                 bsize = (unsigned int) label->block_size;
 439                 block->blocks = (unsigned long) label->block_count;
 440         } else
 441                 block->blocks = end_block;
 442         block->bp_block = bsize;
 443         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 444         for (sb = 512; sb < bsize; sb = sb << 1)
 445                 block->s2b_shift++;
 446         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 447         if (rc && (rc != 4)) {
 448                 pr_warn("%s: DIAG initialization failed with rc=%d\n",
 449                         dev_name(&device->cdev->dev), rc);
 450                 rc = -EIO;
 451         } else {
 452                 if (rc == 4)
 453                         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 454                 pr_info("%s: New DASD with %ld byte/block, total size %ld "
 455                         "KB%s\n", dev_name(&device->cdev->dev),
 456                         (unsigned long) block->bp_block,
 457                         (unsigned long) (block->blocks <<
 458                                          block->s2b_shift) >> 1,
 459                         (rc == 4) ? ", read-only device" : "");
 460                 rc = 0;
 461         }
 462 out_bio:
 463         kfree(bio);
 464 out_label:
 465         free_page((long) label);
 466 out:
 467         if (rc) {
 468                 device->block = NULL;
 469                 dasd_free_block(block);
 470                 device->private = NULL;
 471                 kfree(private);
 472         }
 473         return rc;
 474 }
 475
 476 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 477  * otherwise. */
 478 static int
 479 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 480 {
 481         if (dasd_check_blocksize(block->bp_block) != 0)
 482                 return -EINVAL;
 483         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 484         geo->heads = 16;
 485         geo->sectors = 128 >> block->s2b_shift;
 486         return 0;
 487 }
 488
 489 static dasd_erp_fn_t
 490 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 491 {
 492         return dasd_default_erp_action;
 493 }
 494
 495 static dasd_erp_fn_t
 496 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 497 {
 498         return dasd_default_erp_postaction;
 499 }
 500
 501 /* Create DASD request from block device request. Return pointer to new
 502  * request on success, ERR_PTR otherwise. */
 503 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 504                                                struct dasd_block *block,
 505                                                struct request *req)
 506 {
 507         struct dasd_ccw_req *cqr;
 508         struct dasd_diag_req *dreq;
 509         struct dasd_diag_bio *dbio;
 510         struct req_iterator iter;
 511         struct bio_vec bv;
 512         char *dst;
 513         unsigned int count;
 514         sector_t recid, first_rec, last_rec;
 515         unsigned int blksize, off;
 516         unsigned char rw_cmd;
 517
 518         if (rq_data_dir(req) == READ)
 519                 rw_cmd = MDSK_READ_REQ;
 520         else if (rq_data_dir(req) == WRITE)
 521                 rw_cmd = MDSK_WRITE_REQ;
 522         else
 523                 return ERR_PTR(-EINVAL);
 524         blksize = block->bp_block;
 525         /* Calculate record id of first and last block. */
 526         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 527         last_rec =
 528                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 529         /* Check struct bio and count the number of blocks for the request. */
 530         count = 0;
 531         rq_for_each_segment(bv, req, iter) {
 532                 if (bv.bv_len & (blksize - 1))
 533                         /* Fba can only do full blocks. */
 534                         return ERR_PTR(-EINVAL);
 535                 count += bv.bv_len >> (block->s2b_shift + 9);
 536         }
 537         /* Paranoia. */
 538         if (count != last_rec - first_rec + 1)
 539                 return ERR_PTR(-EINVAL);
 540         /* Build the request */
 541         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, struct_size(dreq, bio, count),
 542                                    memdev, blk_mq_rq_to_pdu(req));
 543         if (IS_ERR(cqr))
 544                 return cqr;
 545
 546         dreq = (struct dasd_diag_req *) cqr->data;
 547         dreq->block_count = count;
 548         dbio = dreq->bio;
 549         recid = first_rec;
 550         rq_for_each_segment(bv, req, iter) {
 551                 dst = bvec_virt(&bv);
 552                 for (off = 0; off < bv.bv_len; off += blksize) {
 553                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 554                         dbio->type = rw_cmd;
 555                         dbio->block_number = recid + 1;
 556                         dbio->buffer = dst;
 557                         dbio++;
 558                         dst += blksize;
 559                         recid++;
 560                 }
 561         }
 562         cqr->retries = memdev->default_retries;
 563         cqr->buildclk = get_tod_clock();
 564         if (blk_noretry_request(req) ||
 565             block->base->features & DASD_FEATURE_FAILFAST)
 566                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 567         cqr->startdev = memdev;
 568         cqr->memdev = memdev;
 569         cqr->block = block;
 570         cqr->expires = memdev->default_expires * HZ;
 571         cqr->status = DASD_CQR_FILLED;
 572         return cqr;
 573 }
 574
 575 /* Release DASD request. Return non-zero if request was successful, zero
 576  * otherwise. */
 577 static int
 578 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 579 {
 580         int status;
 581
 582         status = cqr->status == DASD_CQR_DONE;
 583         dasd_sfree_request(cqr, cqr->memdev);
 584         return status;
 585 }
 586
 587 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 588 {
 589         if (cqr->retries < 0)
 590                 cqr->status = DASD_CQR_FAILED;
 591         else
 592                 cqr->status = DASD_CQR_FILLED;
 593 };
 594
 595 /* Fill in IOCTL data for device. */
 596 static int
 597 dasd_diag_fill_info(struct dasd_device * device,
 598                     struct dasd_information2_t * info)
 599 {
 600         struct dasd_diag_private *private = device->private;
 601
 602         info->label_block = (unsigned int) private->pt_block;
 603         info->FBA_layout = 1;
 604         info->format = DASD_FORMAT_LDL;
 605         info->characteristics_size = sizeof(private->rdc_data);
 606         memcpy(info->characteristics, &private->rdc_data,
 607                sizeof(private->rdc_data));
 608         info->confdata_size = 0;
 609         return 0;
 610 }
 611
 612 static void
 613 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 614                      struct irb *stat)
 615 {
 616         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 617                     "dump sense not available for DIAG data");
 618 }
 619
 620 static unsigned int dasd_diag_max_sectors(struct dasd_block *block)
 621 {
 622         return DIAG_MAX_BLOCKS << block->s2b_shift;
 623 }
 624
 625 static int dasd_diag_pe_handler(struct dasd_device *device,
 626                                 __u8 tbvpm, __u8 fcsecpm)
 627 {
 628         return dasd_generic_verify_path(device, tbvpm);
 629 }
 630
 631 static struct dasd_discipline dasd_diag_discipline = {
 632         .owner = THIS_MODULE,
 633         .name = "DIAG",
 634         .ebcname = "DIAG",
 635         .max_sectors = dasd_diag_max_sectors,
 636         .check_device = dasd_diag_check_device,
 637         .pe_handler = dasd_diag_pe_handler,
 638         .fill_geometry = dasd_diag_fill_geometry,
 639         .start_IO = dasd_start_diag,
 640         .term_IO = dasd_diag_term_IO,
 641         .handle_terminated_request = dasd_diag_handle_terminated_request,
 642         .erp_action = dasd_diag_erp_action,
 643         .erp_postaction = dasd_diag_erp_postaction,
 644         .build_cp = dasd_diag_build_cp,
 645         .free_cp = dasd_diag_free_cp,
 646         .dump_sense = dasd_diag_dump_sense,
 647         .fill_info = dasd_diag_fill_info,
 648 };
 649
 650 static int __init
 651 dasd_diag_init(void)
 652 {
 653         if (!MACHINE_IS_VM) {
 654                 pr_info("Discipline %s cannot be used without z/VM\n",
 655                         dasd_diag_discipline.name);
 656                 return -ENODEV;
 657         }
 658         ASCEBC(dasd_diag_discipline.ebcname, 4);
 659
 660         irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
 661         register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 662         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 663         return 0;
 664 }
 665
 666 static void __exit
 667 dasd_diag_cleanup(void)
 668 {
 669         unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 670         irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
 671         dasd_diag_discipline_pointer = NULL;
 672 }
 673
 674 module_init(dasd_diag_init);
 675 module_exit(dasd_diag_cleanup);