drivers/s390/block/dasd_diag.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_diag.c
   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  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   8  *
   9  */
  10
  11 #define KMSG_COMPONENT "dasd"
  12
  13 #include <linux/kernel_stat.h>
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/jiffies.h>
  22
  23 #include <asm/dasd.h>
  24 #include <asm/debug.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28 #include <asm/vtoc.h>
  29 #include <asm/diag.h>
  30
  31 #include "dasd_int.h"
  32 #include "dasd_diag.h"
  33
  34 #define PRINTK_HEADER "dasd(diag):"
  35
  36 MODULE_LICENSE("GPL");
  37
  38 /* The maximum number of blocks per request (max_blocks) is dependent on the
  39  * amount of storage that is available in the static I/O buffer for each
  40  * device. Currently each device gets 2 pages. We want to fit two requests
  41  * into the available memory so that we can immediately start the next if one
  42  * finishes. */
  43 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  44                            sizeof(struct dasd_diag_req)) / \
  45                            sizeof(struct dasd_diag_bio)) / 2)
  46 #define DIAG_MAX_RETRIES        32
  47 #define DIAG_TIMEOUT            50
  48
  49 static struct dasd_discipline dasd_diag_discipline;
  50
  51 struct dasd_diag_private {
  52         struct dasd_diag_characteristics rdc_data;
  53         struct dasd_diag_rw_io iob;
  54         struct dasd_diag_init_io iib;
  55         blocknum_t pt_block;
  56         struct ccw_dev_id dev_id;
  57 };
  58
  59 struct dasd_diag_req {
  60         unsigned int block_count;
  61         struct dasd_diag_bio bio[0];
  62 };
  63
  64 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  65
  66 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  67  * and function code cmd.
  68  * In case of an exception return 3. Otherwise return result of bitwise OR of
  69  * resulting condition code and DIAG return code. */
  70 static inline int dia250(void *iob, int cmd)
  71 {
  72         register unsigned long reg2 asm ("2") = (unsigned long) iob;
  73         typedef union {
  74                 struct dasd_diag_init_io init_io;
  75                 struct dasd_diag_rw_io rw_io;
  76         } addr_type;
  77         int rc;
  78
  79         rc = 3;
  80         asm volatile(
  81                 "       diag    2,%2,0x250\n"
  82                 "0:     ipm     %0\n"
  83                 "       srl     %0,28\n"
  84                 "       or      %0,3\n"
  85                 "1:\n"
  86                 EX_TABLE(0b,1b)
  87                 : "+d" (rc), "=m" (*(addr_type *) iob)
  88                 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
  89                 : "3", "cc");
  90         return rc;
  91 }
  92
  93 /* Initialize block I/O to DIAG device using the specified blocksize and
  94  * block offset. On success, return zero and set end_block to contain the
  95  * number of blocks on the device minus the specified offset. Return non-zero
  96  * otherwise. */
  97 static inline int
  98 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
  99              blocknum_t offset, blocknum_t *end_block)
 100 {
 101         struct dasd_diag_private *private;
 102         struct dasd_diag_init_io *iib;
 103         int rc;
 104
 105         private = (struct dasd_diag_private *) device->private;
 106         iib = &private->iib;
 107         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 108
 109         iib->dev_nr = private->dev_id.devno;
 110         iib->block_size = blocksize;
 111         iib->offset = offset;
 112         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 113
 114         rc = dia250(iib, INIT_BIO);
 115
 116         if ((rc & 3) == 0 && end_block)
 117                 *end_block = iib->end_block;
 118
 119         return rc;
 120 }
 121
 122 /* Remove block I/O environment for device. Return zero on success, non-zero
 123  * otherwise. */
 124 static inline int
 125 mdsk_term_io(struct dasd_device * device)
 126 {
 127         struct dasd_diag_private *private;
 128         struct dasd_diag_init_io *iib;
 129         int rc;
 130
 131         private = (struct dasd_diag_private *) device->private;
 132         iib = &private->iib;
 133         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 134         iib->dev_nr = private->dev_id.devno;
 135         rc = dia250(iib, TERM_BIO);
 136         return rc;
 137 }
 138
 139 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 140  * environment. */
 141 static void
 142 dasd_diag_erp(struct dasd_device *device)
 143 {
 144         int rc;
 145
 146         mdsk_term_io(device);
 147         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 148         if (rc == 4) {
 149                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 150                         pr_warning("%s: The access mode of a DIAG device "
 151                                    "changed to read-only\n",
 152                                    dev_name(&device->cdev->dev));
 153                 rc = 0;
 154         }
 155         if (rc)
 156                 pr_warning("%s: DIAG ERP failed with "
 157                             "rc=%d\n", dev_name(&device->cdev->dev), rc);
 158 }
 159
 160 /* Start a given request at the device. Return zero on success, non-zero
 161  * otherwise. */
 162 static int
 163 dasd_start_diag(struct dasd_ccw_req * cqr)
 164 {
 165         struct dasd_device *device;
 166         struct dasd_diag_private *private;
 167         struct dasd_diag_req *dreq;
 168         int rc;
 169
 170         device = cqr->startdev;
 171         if (cqr->retries < 0) {
 172                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 173                             "- no retry left)", cqr);
 174                 cqr->status = DASD_CQR_ERROR;
 175                 return -EIO;
 176         }
 177         private = (struct dasd_diag_private *) device->private;
 178         dreq = (struct dasd_diag_req *) cqr->data;
 179
 180         private->iob.dev_nr = private->dev_id.devno;
 181         private->iob.key = 0;
 182         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 183         private->iob.block_count = dreq->block_count;
 184         private->iob.interrupt_params = (addr_t) cqr;
 185         private->iob.bio_list = dreq->bio;
 186         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 187
 188         cqr->startclk = get_clock();
 189         cqr->starttime = jiffies;
 190         cqr->retries--;
 191
 192         rc = dia250(&private->iob, RW_BIO);
 193         switch (rc) {
 194         case 0: /* Synchronous I/O finished successfully */
 195                 cqr->stopclk = get_clock();
 196                 cqr->status = DASD_CQR_SUCCESS;
 197                 /* Indicate to calling function that only a dasd_schedule_bh()
 198                    and no timer is needed */
 199                 rc = -EACCES;
 200                 break;
 201         case 8: /* Asynchronous I/O was started */
 202                 cqr->status = DASD_CQR_IN_IO;
 203                 rc = 0;
 204                 break;
 205         default: /* Error condition */
 206                 cqr->status = DASD_CQR_QUEUED;
 207                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 208                 dasd_diag_erp(device);
 209                 rc = -EIO;
 210                 break;
 211         }
 212         cqr->intrc = rc;
 213         return rc;
 214 }
 215
 216 /* Terminate given request at the device. */
 217 static int
 218 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 219 {
 220         struct dasd_device *device;
 221
 222         device = cqr->startdev;
 223         mdsk_term_io(device);
 224         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 225         cqr->status = DASD_CQR_CLEAR_PENDING;
 226         cqr->stopclk = get_clock();
 227         dasd_schedule_device_bh(device);
 228         return 0;
 229 }
 230
 231 /* Handle external interruption. */
 232 static void dasd_ext_handler(unsigned int ext_int_code,
 233                              unsigned int param32, unsigned long param64)
 234 {
 235         struct dasd_ccw_req *cqr, *next;
 236         struct dasd_device *device;
 237         unsigned long long expires;
 238         unsigned long flags;
 239         addr_t ip;
 240         int rc;
 241
 242         switch (ext_int_code >> 24) {
 243         case DASD_DIAG_CODE_31BIT:
 244                 ip = (addr_t) param32;
 245                 break;
 246         case DASD_DIAG_CODE_64BIT:
 247                 ip = (addr_t) param64;
 248                 break;
 249         default:
 250                 return;
 251         }
 252         kstat_cpu(smp_processor_id()).irqs[EXTINT_DSD]++;
 253         if (!ip) {              /* no intparm: unsolicited interrupt */
 254                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 255                               "interrupt");
 256                 return;
 257         }
 258         cqr = (struct dasd_ccw_req *) ip;
 259         device = (struct dasd_device *) cqr->startdev;
 260         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 261                 DBF_DEV_EVENT(DBF_WARNING, device,
 262                             " magic number of dasd_ccw_req 0x%08X doesn't"
 263                             " match discipline 0x%08X",
 264                             cqr->magic, *(int *) (&device->discipline->name));
 265                 return;
 266         }
 267
 268         /* get irq lock to modify request queue */
 269         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 270
 271         /* Check for a pending clear operation */
 272         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 273                 cqr->status = DASD_CQR_CLEARED;
 274                 dasd_device_clear_timer(device);
 275                 dasd_schedule_device_bh(device);
 276                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 277                 return;
 278         }
 279
 280         cqr->stopclk = get_clock();
 281
 282         expires = 0;
 283         if ((ext_int_code & 0xff0000) == 0) {
 284                 cqr->status = DASD_CQR_SUCCESS;
 285                 /* Start first request on queue if possible -> fast_io. */
 286                 if (!list_empty(&device->ccw_queue)) {
 287                         next = list_entry(device->ccw_queue.next,
 288                                           struct dasd_ccw_req, devlist);
 289                         if (next->status == DASD_CQR_QUEUED) {
 290                                 rc = dasd_start_diag(next);
 291                                 if (rc == 0)
 292                                         expires = next->expires;
 293                         }
 294                 }
 295         } else {
 296                 cqr->status = DASD_CQR_QUEUED;
 297                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 298                               "request %p was %d (%d retries left)", cqr,
 299                               (ext_int_code >> 16) & 0xff, cqr->retries);
 300                 dasd_diag_erp(device);
 301         }
 302
 303         if (expires != 0)
 304                 dasd_device_set_timer(device, expires);
 305         else
 306                 dasd_device_clear_timer(device);
 307         dasd_schedule_device_bh(device);
 308
 309         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 310 }
 311
 312 /* Check whether device can be controlled by DIAG discipline. Return zero on
 313  * success, non-zero otherwise. */
 314 static int
 315 dasd_diag_check_device(struct dasd_device *device)
 316 {
 317         struct dasd_block *block;
 318         struct dasd_diag_private *private;
 319         struct dasd_diag_characteristics *rdc_data;
 320         struct dasd_diag_bio bio;
 321         struct vtoc_cms_label *label;
 322         blocknum_t end_block;
 323         unsigned int sb, bsize;
 324         int rc;
 325
 326         private = (struct dasd_diag_private *) device->private;
 327         if (private == NULL) {
 328                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 329                 if (private == NULL) {
 330                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 331                                 "Allocating memory for private DASD data "
 332                                       "failed\n");
 333                         return -ENOMEM;
 334                 }
 335                 ccw_device_get_id(device->cdev, &private->dev_id);
 336                 device->private = (void *) private;
 337         }
 338         block = dasd_alloc_block();
 339         if (IS_ERR(block)) {
 340                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 341                             "could not allocate dasd block structure");
 342                 device->private = NULL;
 343                 kfree(private);
 344                 return PTR_ERR(block);
 345         }
 346         device->block = block;
 347         block->base = device;
 348
 349         /* Read Device Characteristics */
 350         rdc_data = (void *) &(private->rdc_data);
 351         rdc_data->dev_nr = private->dev_id.devno;
 352         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 353
 354         rc = diag210((struct diag210 *) rdc_data);
 355         if (rc) {
 356                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 357                             "information (rc=%d)", rc);
 358                 rc = -EOPNOTSUPP;
 359                 goto out;
 360         }
 361
 362         device->default_expires = DIAG_TIMEOUT;
 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 = DIAG_MAX_RETRIES;
 560         cqr->buildclk = get_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         cqr->status = DASD_CQR_FILLED;
 587 };
 588
 589 /* Fill in IOCTL data for device. */
 590 static int
 591 dasd_diag_fill_info(struct dasd_device * device,
 592                     struct dasd_information2_t * info)
 593 {
 594         struct dasd_diag_private *private;
 595
 596         private = (struct dasd_diag_private *) device->private;
 597         info->label_block = (unsigned int) private->pt_block;
 598         info->FBA_layout = 1;
 599         info->format = DASD_FORMAT_LDL;
 600         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 601         memcpy(info->characteristics,
 602                &((struct dasd_diag_private *) device->private)->rdc_data,
 603                sizeof (struct dasd_diag_characteristics));
 604         info->confdata_size = 0;
 605         return 0;
 606 }
 607
 608 static void
 609 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 610                      struct irb *stat)
 611 {
 612         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 613                     "dump sense not available for DIAG data");
 614 }
 615
 616 static struct dasd_discipline dasd_diag_discipline = {
 617         .owner = THIS_MODULE,
 618         .name = "DIAG",
 619         .ebcname = "DIAG",
 620         .max_blocks = DIAG_MAX_BLOCKS,
 621         .check_device = dasd_diag_check_device,
 622         .verify_path = dasd_generic_verify_path,
 623         .fill_geometry = dasd_diag_fill_geometry,
 624         .start_IO = dasd_start_diag,
 625         .term_IO = dasd_diag_term_IO,
 626         .handle_terminated_request = dasd_diag_handle_terminated_request,
 627         .erp_action = dasd_diag_erp_action,
 628         .erp_postaction = dasd_diag_erp_postaction,
 629         .build_cp = dasd_diag_build_cp,
 630         .free_cp = dasd_diag_free_cp,
 631         .dump_sense = dasd_diag_dump_sense,
 632         .fill_info = dasd_diag_fill_info,
 633 };
 634
 635 static int __init
 636 dasd_diag_init(void)
 637 {
 638         if (!MACHINE_IS_VM) {
 639                 pr_info("Discipline %s cannot be used without z/VM\n",
 640                         dasd_diag_discipline.name);
 641                 return -ENODEV;
 642         }
 643         ASCEBC(dasd_diag_discipline.ebcname, 4);
 644
 645         service_subclass_irq_register();
 646         register_external_interrupt(0x2603, dasd_ext_handler);
 647         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 648         return 0;
 649 }
 650
 651 static void __exit
 652 dasd_diag_cleanup(void)
 653 {
 654         unregister_external_interrupt(0x2603, dasd_ext_handler);
 655         service_subclass_irq_unregister();
 656         dasd_diag_discipline_pointer = NULL;
 657 }
 658
 659 module_init(dasd_diag_init);
 660 module_exit(dasd_diag_cleanup);