kernel/drivers/s390/block/dasd_diag.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  * Based on.......: linux/drivers/s390/block/mdisk.c
   4  * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
   5  * Bugreports.to..: <Linux390@de.ibm.com>
   6  * Copyright IBM Corp. 1999, 2000
   7  *
   8  */
   9
  10 #define KMSG_COMPONENT "dasd"
  11
  12 #include <linux/kernel_stat.h>
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/hdreg.h>
  17 #include <linux/bio.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/jiffies.h>
  21
  22 #include <asm/dasd.h>
  23 #include <asm/debug.h>
  24 #include <asm/ebcdic.h>
  25 #include <asm/io.h>
  26 #include <asm/irq.h>
  27 #include <asm/vtoc.h>
  28 #include <asm/diag.h>
  29
  30 #include "dasd_int.h"
  31 #include "dasd_diag.h"
  32
  33 #define PRINTK_HEADER "dasd(diag):"
  34
  35 MODULE_LICENSE("GPL");
  36
  37 /* The maximum number of blocks per request (max_blocks) is dependent on the
  38  * amount of storage that is available in the static I/O buffer for each
  39  * device. Currently each device gets 2 pages. We want to fit two requests
  40  * into the available memory so that we can immediately start the next if one
  41  * finishes. */
  42 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  43                            sizeof(struct dasd_diag_req)) / \
  44                            sizeof(struct dasd_diag_bio)) / 2)
  45 #define DIAG_MAX_RETRIES        32
  46 #define DIAG_TIMEOUT            50
  47
  48 static struct dasd_discipline dasd_diag_discipline;
  49
  50 struct dasd_diag_private {
  51         struct dasd_diag_characteristics rdc_data;
  52         struct dasd_diag_rw_io iob;
  53         struct dasd_diag_init_io iib;
  54         blocknum_t pt_block;
  55         struct ccw_dev_id dev_id;
  56 };
  57
  58 struct dasd_diag_req {
  59         unsigned int block_count;
  60         struct dasd_diag_bio bio[0];
  61 };
  62
  63 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  64
  65 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  66  * and function code cmd.
  67  * In case of an exception return 3. Otherwise return result of bitwise OR of
  68  * resulting condition code and DIAG return code. */
  69 static inline int dia250(void *iob, int cmd)
  70 {
  71         register unsigned long reg2 asm ("2") = (unsigned long) iob;
  72         typedef union {
  73                 struct dasd_diag_init_io init_io;
  74                 struct dasd_diag_rw_io rw_io;
  75         } addr_type;
  76         int rc;
  77
  78         rc = 3;
  79         asm volatile(
  80                 "       diag    2,%2,0x250\n"
  81                 "0:     ipm     %0\n"
  82                 "       srl     %0,28\n"
  83                 "       or      %0,3\n"
  84                 "1:\n"
  85                 EX_TABLE(0b,1b)
  86                 : "+d" (rc), "=m" (*(addr_type *) iob)
  87                 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
  88                 : "3", "cc");
  89         return rc;
  90 }
  91
  92 /* Initialize block I/O to DIAG device using the specified blocksize and
  93  * block offset. On success, return zero and set end_block to contain the
  94  * number of blocks on the device minus the specified offset. Return non-zero
  95  * otherwise. */
  96 static inline int
  97 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
  98              blocknum_t offset, blocknum_t *end_block)
  99 {
 100         struct dasd_diag_private *private;
 101         struct dasd_diag_init_io *iib;
 102         int rc;
 103
 104         private = (struct dasd_diag_private *) device->private;
 105         iib = &private->iib;
 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;
 127         struct dasd_diag_init_io *iib;
 128         int rc;
 129
 130         private = (struct dasd_diag_private *) device->private;
 131         iib = &private->iib;
 132         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 133         iib->dev_nr = private->dev_id.devno;
 134         rc = dia250(iib, TERM_BIO);
 135         return rc;
 136 }
 137
 138 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 139  * environment. */
 140 static void
 141 dasd_diag_erp(struct dasd_device *device)
 142 {
 143         int rc;
 144
 145         mdsk_term_io(device);
 146         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 147         if (rc == 4) {
 148                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 149                         pr_warning("%s: The access mode of a DIAG device "
 150                                    "changed to read-only\n",
 151                                    dev_name(&device->cdev->dev));
 152                 rc = 0;
 153         }
 154         if (rc)
 155                 pr_warning("%s: DIAG ERP failed with "
 156                             "rc=%d\n", dev_name(&device->cdev->dev), rc);
 157 }
 158
 159 /* Start a given request at the device. Return zero on success, non-zero
 160  * otherwise. */
 161 static int
 162 dasd_start_diag(struct dasd_ccw_req * cqr)
 163 {
 164         struct dasd_device *device;
 165         struct dasd_diag_private *private;
 166         struct dasd_diag_req *dreq;
 167         int rc;
 168
 169         device = cqr->startdev;
 170         if (cqr->retries < 0) {
 171                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 172                             "- no retry left)", cqr);
 173                 cqr->status = DASD_CQR_ERROR;
 174                 return -EIO;
 175         }
 176         private = (struct dasd_diag_private *) device->private;
 177         dreq = (struct dasd_diag_req *) cqr->data;
 178
 179         private->iob.dev_nr = private->dev_id.devno;
 180         private->iob.key = 0;
 181         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 182         private->iob.block_count = dreq->block_count;
 183         private->iob.interrupt_params = (addr_t) cqr;
 184         private->iob.bio_list = dreq->bio;
 185         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 186
 187         cqr->startclk = get_tod_clock();
 188         cqr->starttime = jiffies;
 189         cqr->retries--;
 190
 191         rc = dia250(&private->iob, RW_BIO);
 192         switch (rc) {
 193         case 0: /* Synchronous I/O finished successfully */
 194                 cqr->stopclk = get_tod_clock();
 195                 cqr->status = DASD_CQR_SUCCESS;
 196                 /* Indicate to calling function that only a dasd_schedule_bh()
 197                    and no timer is needed */
 198                 rc = -EACCES;
 199                 break;
 200         case 8: /* Asynchronous I/O was started */
 201                 cqr->status = DASD_CQR_IN_IO;
 202                 rc = 0;
 203                 break;
 204         default: /* Error condition */
 205                 cqr->status = DASD_CQR_QUEUED;
 206                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 207                 dasd_diag_erp(device);
 208                 rc = -EIO;
 209                 break;
 210         }
 211         cqr->intrc = rc;
 212         return rc;
 213 }
 214
 215 /* Terminate given request at the device. */
 216 static int
 217 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 218 {
 219         struct dasd_device *device;
 220
 221         device = cqr->startdev;
 222         mdsk_term_io(device);
 223         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 224         cqr->status = DASD_CQR_CLEAR_PENDING;
 225         cqr->stopclk = get_tod_clock();
 226         dasd_schedule_device_bh(device);
 227         return 0;
 228 }
 229
 230 /* Handle external interruption. */
 231 static void dasd_ext_handler(struct ext_code ext_code,
 232                              unsigned int param32, unsigned long param64)
 233 {
 234         struct dasd_ccw_req *cqr, *next;
 235         struct dasd_device *device;
 236         unsigned long long expires;
 237         unsigned long flags;
 238         addr_t ip;
 239         int rc;
 240
 241         switch (ext_code.subcode >> 8) {
 242         case DASD_DIAG_CODE_31BIT:
 243                 ip = (addr_t) param32;
 244                 break;
 245         case DASD_DIAG_CODE_64BIT:
 246                 ip = (addr_t) param64;
 247                 break;
 248         default:
 249                 return;
 250         }
 251         inc_irq_stat(IRQEXT_DSD);
 252         if (!ip) {              /* no intparm: unsolicited interrupt */
 253                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 254                               "interrupt");
 255                 return;
 256         }
 257         cqr = (struct dasd_ccw_req *) ip;
 258         device = (struct dasd_device *) cqr->startdev;
 259         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 260                 DBF_DEV_EVENT(DBF_WARNING, device,
 261                             " magic number of dasd_ccw_req 0x%08X doesn't"
 262                             " match discipline 0x%08X",
 263                             cqr->magic, *(int *) (&device->discipline->name));
 264                 return;
 265         }
 266
 267         /* get irq lock to modify request queue */
 268         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 269
 270         /* Check for a pending clear operation */
 271         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 272                 cqr->status = DASD_CQR_CLEARED;
 273                 dasd_device_clear_timer(device);
 274                 dasd_schedule_device_bh(device);
 275                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 276                 return;
 277         }
 278
 279         cqr->stopclk = get_tod_clock();
 280
 281         expires = 0;
 282         if ((ext_code.subcode & 0xff) == 0) {
 283                 cqr->status = DASD_CQR_SUCCESS;
 284                 /* Start first request on queue if possible -> fast_io. */
 285                 if (!list_empty(&device->ccw_queue)) {
 286                         next = list_entry(device->ccw_queue.next,
 287                                           struct dasd_ccw_req, devlist);
 288                         if (next->status == DASD_CQR_QUEUED) {
 289                                 rc = dasd_start_diag(next);
 290                                 if (rc == 0)
 291                                         expires = next->expires;
 292                         }
 293                 }
 294         } else {
 295                 cqr->status = DASD_CQR_QUEUED;
 296                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 297                               "request %p was %d (%d retries left)", cqr,
 298                               ext_code.subcode & 0xff, cqr->retries);
 299                 dasd_diag_erp(device);
 300         }
 301
 302         if (expires != 0)
 303                 dasd_device_set_timer(device, expires);
 304         else
 305                 dasd_device_clear_timer(device);
 306         dasd_schedule_device_bh(device);
 307
 308         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 309 }
 310
 311 /* Check whether device can be controlled by DIAG discipline. Return zero on
 312  * success, non-zero otherwise. */
 313 static int
 314 dasd_diag_check_device(struct dasd_device *device)
 315 {
 316         struct dasd_block *block;
 317         struct dasd_diag_private *private;
 318         struct dasd_diag_characteristics *rdc_data;
 319         struct dasd_diag_bio bio;
 320         struct vtoc_cms_label *label;
 321         blocknum_t end_block;
 322         unsigned int sb, bsize;
 323         int rc;
 324
 325         private = (struct dasd_diag_private *) device->private;
 326         if (private == NULL) {
 327                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 328                 if (private == NULL) {
 329                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 330                                 "Allocating memory for private DASD data "
 331                                       "failed\n");
 332                         return -ENOMEM;
 333                 }
 334                 ccw_device_get_id(device->cdev, &private->dev_id);
 335                 device->private = (void *) private;
 336         }
 337         block = dasd_alloc_block();
 338         if (IS_ERR(block)) {
 339                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 340                             "could not allocate dasd block structure");
 341                 device->private = NULL;
 342                 kfree(private);
 343                 return PTR_ERR(block);
 344         }
 345         device->block = block;
 346         block->base = device;
 347
 348         /* Read Device Characteristics */
 349         rdc_data = (void *) &(private->rdc_data);
 350         rdc_data->dev_nr = private->dev_id.devno;
 351         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 352
 353         rc = diag210((struct diag210 *) rdc_data);
 354         if (rc) {
 355                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 356                             "information (rc=%d)", rc);
 357                 rc = -EOPNOTSUPP;
 358                 goto out;
 359         }
 360
 361         device->default_expires = DIAG_TIMEOUT;
 362         device->default_retries = DIAG_MAX_RETRIES;
 363
 364         /* Figure out position of label block */
 365         switch (private->rdc_data.vdev_class) {
 366         case DEV_CLASS_FBA:
 367                 private->pt_block = 1;
 368                 break;
 369         case DEV_CLASS_ECKD:
 370                 private->pt_block = 2;
 371                 break;
 372         default:
 373                 pr_warning("%s: Device type %d is not supported "
 374                            "in DIAG mode\n", dev_name(&device->cdev->dev),
 375                            private->rdc_data.vdev_class);
 376                 rc = -EOPNOTSUPP;
 377                 goto out;
 378         }
 379
 380         DBF_DEV_EVENT(DBF_INFO, device,
 381                       "%04X: %04X on real %04X/%02X",
 382                       rdc_data->dev_nr,
 383                       rdc_data->vdev_type,
 384                       rdc_data->rdev_type, rdc_data->rdev_model);
 385
 386         /* terminate all outstanding operations */
 387         mdsk_term_io(device);
 388
 389         /* figure out blocksize of device */
 390         label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
 391         if (label == NULL)  {
 392                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 393                             "No memory to allocate initialization request");
 394                 rc = -ENOMEM;
 395                 goto out;
 396         }
 397         rc = 0;
 398         end_block = 0;
 399         /* try all sizes - needed for ECKD devices */
 400         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 401                 mdsk_init_io(device, bsize, 0, &end_block);
 402                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
 403                 bio.type = MDSK_READ_REQ;
 404                 bio.block_number = private->pt_block + 1;
 405                 bio.buffer = label;
 406                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 407                 private->iob.dev_nr = rdc_data->dev_nr;
 408                 private->iob.key = 0;
 409                 private->iob.flags = 0; /* do synchronous io */
 410                 private->iob.block_count = 1;
 411                 private->iob.interrupt_params = 0;
 412                 private->iob.bio_list = &bio;
 413                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 414                 rc = dia250(&private->iob, RW_BIO);
 415                 if (rc == 3) {
 416                         pr_warning("%s: A 64-bit DIAG call failed\n",
 417                                    dev_name(&device->cdev->dev));
 418                         rc = -EOPNOTSUPP;
 419                         goto out_label;
 420                 }
 421                 mdsk_term_io(device);
 422                 if (rc == 0)
 423                         break;
 424         }
 425         if (bsize > PAGE_SIZE) {
 426                 pr_warning("%s: Accessing the DASD failed because of an "
 427                            "incorrect format (rc=%d)\n",
 428                            dev_name(&device->cdev->dev), rc);
 429                 rc = -EIO;
 430                 goto out_label;
 431         }
 432         /* check for label block */
 433         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 434                   sizeof(DASD_DIAG_CMS1)) == 0) {
 435                 /* get formatted blocksize from label block */
 436                 bsize = (unsigned int) label->block_size;
 437                 block->blocks = (unsigned long) label->block_count;
 438         } else
 439                 block->blocks = end_block;
 440         block->bp_block = bsize;
 441         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 442         for (sb = 512; sb < bsize; sb = sb << 1)
 443                 block->s2b_shift++;
 444         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 445         if (rc && (rc != 4)) {
 446                 pr_warning("%s: DIAG initialization failed with rc=%d\n",
 447                            dev_name(&device->cdev->dev), rc);
 448                 rc = -EIO;
 449         } else {
 450                 if (rc == 4)
 451                         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 452                 pr_info("%s: New DASD with %ld byte/block, total size %ld "
 453                         "KB%s\n", dev_name(&device->cdev->dev),
 454                         (unsigned long) block->bp_block,
 455                         (unsigned long) (block->blocks <<
 456                                          block->s2b_shift) >> 1,
 457                         (rc == 4) ? ", read-only device" : "");
 458                 rc = 0;
 459         }
 460 out_label:
 461         free_page((long) label);
 462 out:
 463         if (rc) {
 464                 device->block = NULL;
 465                 dasd_free_block(block);
 466                 device->private = NULL;
 467                 kfree(private);
 468         }
 469         return rc;
 470 }
 471
 472 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 473  * otherwise. */
 474 static int
 475 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 476 {
 477         if (dasd_check_blocksize(block->bp_block) != 0)
 478                 return -EINVAL;
 479         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 480         geo->heads = 16;
 481         geo->sectors = 128 >> block->s2b_shift;
 482         return 0;
 483 }
 484
 485 static dasd_erp_fn_t
 486 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 487 {
 488         return dasd_default_erp_action;
 489 }
 490
 491 static dasd_erp_fn_t
 492 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 493 {
 494         return dasd_default_erp_postaction;
 495 }
 496
 497 /* Create DASD request from block device request. Return pointer to new
 498  * request on success, ERR_PTR otherwise. */
 499 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 500                                                struct dasd_block *block,
 501                                                struct request *req)
 502 {
 503         struct dasd_ccw_req *cqr;
 504         struct dasd_diag_req *dreq;
 505         struct dasd_diag_bio *dbio;
 506         struct req_iterator iter;
 507         struct bio_vec bv;
 508         char *dst;
 509         unsigned int count, datasize;
 510         sector_t recid, first_rec, last_rec;
 511         unsigned int blksize, off;
 512         unsigned char rw_cmd;
 513
 514         if (rq_data_dir(req) == READ)
 515                 rw_cmd = MDSK_READ_REQ;
 516         else if (rq_data_dir(req) == WRITE)
 517                 rw_cmd = MDSK_WRITE_REQ;
 518         else
 519                 return ERR_PTR(-EINVAL);
 520         blksize = block->bp_block;
 521         /* Calculate record id of first and last block. */
 522         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 523         last_rec =
 524                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 525         /* Check struct bio and count the number of blocks for the request. */
 526         count = 0;
 527         rq_for_each_segment(bv, req, iter) {
 528                 if (bv.bv_len & (blksize - 1))
 529                         /* Fba can only do full blocks. */
 530                         return ERR_PTR(-EINVAL);
 531                 count += bv.bv_len >> (block->s2b_shift + 9);
 532         }
 533         /* Paranoia. */
 534         if (count != last_rec - first_rec + 1)
 535                 return ERR_PTR(-EINVAL);
 536         /* Build the request */
 537         datasize = sizeof(struct dasd_diag_req) +
 538                 count*sizeof(struct dasd_diag_bio);
 539         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
 540         if (IS_ERR(cqr))
 541                 return cqr;
 542
 543         dreq = (struct dasd_diag_req *) cqr->data;
 544         dreq->block_count = count;
 545         dbio = dreq->bio;
 546         recid = first_rec;
 547         rq_for_each_segment(bv, req, iter) {
 548                 dst = page_address(bv.bv_page) + bv.bv_offset;
 549                 for (off = 0; off < bv.bv_len; off += blksize) {
 550                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 551                         dbio->type = rw_cmd;
 552                         dbio->block_number = recid + 1;
 553                         dbio->buffer = dst;
 554                         dbio++;
 555                         dst += blksize;
 556                         recid++;
 557                 }
 558         }
 559         cqr->retries = memdev->default_retries;
 560         cqr->buildclk = get_tod_clock();
 561         if (blk_noretry_request(req) ||
 562             block->base->features & DASD_FEATURE_FAILFAST)
 563                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 564         cqr->startdev = memdev;
 565         cqr->memdev = memdev;
 566         cqr->block = block;
 567         cqr->expires = memdev->default_expires * HZ;
 568         cqr->status = DASD_CQR_FILLED;
 569         return cqr;
 570 }
 571
 572 /* Release DASD request. Return non-zero if request was successful, zero
 573  * otherwise. */
 574 static int
 575 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 576 {
 577         int status;
 578
 579         status = cqr->status == DASD_CQR_DONE;
 580         dasd_sfree_request(cqr, cqr->memdev);
 581         return status;
 582 }
 583
 584 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 585 {
 586         if (cqr->retries < 0)
 587                 cqr->status = DASD_CQR_FAILED;
 588         else
 589                 cqr->status = DASD_CQR_FILLED;
 590 };
 591
 592 /* Fill in IOCTL data for device. */
 593 static int
 594 dasd_diag_fill_info(struct dasd_device * device,
 595                     struct dasd_information2_t * info)
 596 {
 597         struct dasd_diag_private *private;
 598
 599         private = (struct dasd_diag_private *) device->private;
 600         info->label_block = (unsigned int) private->pt_block;
 601         info->FBA_layout = 1;
 602         info->format = DASD_FORMAT_LDL;
 603         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 604         memcpy(info->characteristics,
 605                &((struct dasd_diag_private *) device->private)->rdc_data,
 606                sizeof (struct dasd_diag_characteristics));
 607         info->confdata_size = 0;
 608         return 0;
 609 }
 610
 611 static void
 612 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 613                      struct irb *stat)
 614 {
 615         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 616                     "dump sense not available for DIAG data");
 617 }
 618
 619 static struct dasd_discipline dasd_diag_discipline = {
 620         .owner = THIS_MODULE,
 621         .name = "DIAG",
 622         .ebcname = "DIAG",
 623         .max_blocks = DIAG_MAX_BLOCKS,
 624         .check_device = dasd_diag_check_device,
 625         .verify_path = dasd_generic_verify_path,
 626         .fill_geometry = dasd_diag_fill_geometry,
 627         .start_IO = dasd_start_diag,
 628         .term_IO = dasd_diag_term_IO,
 629         .handle_terminated_request = dasd_diag_handle_terminated_request,
 630         .erp_action = dasd_diag_erp_action,
 631         .erp_postaction = dasd_diag_erp_postaction,
 632         .build_cp = dasd_diag_build_cp,
 633         .free_cp = dasd_diag_free_cp,
 634         .dump_sense = dasd_diag_dump_sense,
 635         .fill_info = dasd_diag_fill_info,
 636 };
 637
 638 static int __init
 639 dasd_diag_init(void)
 640 {
 641         if (!MACHINE_IS_VM) {
 642                 pr_info("Discipline %s cannot be used without z/VM\n",
 643                         dasd_diag_discipline.name);
 644                 return -ENODEV;
 645         }
 646         ASCEBC(dasd_diag_discipline.ebcname, 4);
 647
 648         irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
 649         register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 650         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 651         return 0;
 652 }
 653
 654 static void __exit
 655 dasd_diag_cleanup(void)
 656 {
 657         unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 658         irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
 659         dasd_diag_discipline_pointer = NULL;
 660 }
 661
 662 module_init(dasd_diag_init);
 663 module_exit(dasd_diag_cleanup);