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/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/s390_ext.h>
  27 #include <asm/todclk.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 * HZ
  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)
 149                 dev_warn(&device->cdev->dev, "DIAG ERP failed with "
 150                             "rc=%d\n", rc);
 151 }
 152
 153 /* Start a given request at the device. Return zero on success, non-zero
 154  * otherwise. */
 155 static int
 156 dasd_start_diag(struct dasd_ccw_req * cqr)
 157 {
 158         struct dasd_device *device;
 159         struct dasd_diag_private *private;
 160         struct dasd_diag_req *dreq;
 161         int rc;
 162
 163         device = cqr->startdev;
 164         if (cqr->retries < 0) {
 165                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 166                             "- no retry left)", cqr);
 167                 cqr->status = DASD_CQR_ERROR;
 168                 return -EIO;
 169         }
 170         private = (struct dasd_diag_private *) device->private;
 171         dreq = (struct dasd_diag_req *) cqr->data;
 172
 173         private->iob.dev_nr = private->dev_id.devno;
 174         private->iob.key = 0;
 175         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 176         private->iob.block_count = dreq->block_count;
 177         private->iob.interrupt_params = (addr_t) cqr;
 178         private->iob.bio_list = dreq->bio;
 179         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 180
 181         cqr->startclk = get_clock();
 182         cqr->starttime = jiffies;
 183         cqr->retries--;
 184
 185         rc = dia250(&private->iob, RW_BIO);
 186         switch (rc) {
 187         case 0: /* Synchronous I/O finished successfully */
 188                 cqr->stopclk = get_clock();
 189                 cqr->status = DASD_CQR_SUCCESS;
 190                 /* Indicate to calling function that only a dasd_schedule_bh()
 191                    and no timer is needed */
 192                 rc = -EACCES;
 193                 break;
 194         case 8: /* Asynchronous I/O was started */
 195                 cqr->status = DASD_CQR_IN_IO;
 196                 rc = 0;
 197                 break;
 198         default: /* Error condition */
 199                 cqr->status = DASD_CQR_QUEUED;
 200                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 201                 dasd_diag_erp(device);
 202                 rc = -EIO;
 203                 break;
 204         }
 205         cqr->intrc = rc;
 206         return rc;
 207 }
 208
 209 /* Terminate given request at the device. */
 210 static int
 211 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 212 {
 213         struct dasd_device *device;
 214
 215         device = cqr->startdev;
 216         mdsk_term_io(device);
 217         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 218         cqr->status = DASD_CQR_CLEAR_PENDING;
 219         cqr->stopclk = get_clock();
 220         dasd_schedule_device_bh(device);
 221         return 0;
 222 }
 223
 224 /* Handle external interruption. */
 225 static void
 226 dasd_ext_handler(__u16 code)
 227 {
 228         struct dasd_ccw_req *cqr, *next;
 229         struct dasd_device *device;
 230         unsigned long long expires;
 231         unsigned long flags;
 232         u8 int_code, status;
 233         addr_t ip;
 234         int rc;
 235
 236         int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
 237         status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
 238         switch (int_code) {
 239         case DASD_DIAG_CODE_31BIT:
 240                 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
 241                 break;
 242         case DASD_DIAG_CODE_64BIT:
 243                 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
 244                 break;
 245         default:
 246                 return;
 247         }
 248         if (!ip) {              /* no intparm: unsolicited interrupt */
 249                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 250                               "interrupt");
 251                 return;
 252         }
 253         cqr = (struct dasd_ccw_req *) ip;
 254         device = (struct dasd_device *) cqr->startdev;
 255         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 256                 DBF_DEV_EVENT(DBF_WARNING, device,
 257                             " magic number of dasd_ccw_req 0x%08X doesn't"
 258                             " match discipline 0x%08X",
 259                             cqr->magic, *(int *) (&device->discipline->name));
 260                 return;
 261         }
 262
 263         /* get irq lock to modify request queue */
 264         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 265
 266         /* Check for a pending clear operation */
 267         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 268                 cqr->status = DASD_CQR_CLEARED;
 269                 dasd_device_clear_timer(device);
 270                 dasd_schedule_device_bh(device);
 271                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 272                 return;
 273         }
 274
 275         cqr->stopclk = get_clock();
 276
 277         expires = 0;
 278         if (status == 0) {
 279                 cqr->status = DASD_CQR_SUCCESS;
 280                 /* Start first request on queue if possible -> fast_io. */
 281                 if (!list_empty(&device->ccw_queue)) {
 282                         next = list_entry(device->ccw_queue.next,
 283                                           struct dasd_ccw_req, devlist);
 284                         if (next->status == DASD_CQR_QUEUED) {
 285                                 rc = dasd_start_diag(next);
 286                                 if (rc == 0)
 287                                         expires = next->expires;
 288                         }
 289                 }
 290         } else {
 291                 cqr->status = DASD_CQR_QUEUED;
 292                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 293                             "request %p was %d (%d retries left)", cqr, status,
 294                             cqr->retries);
 295                 dasd_diag_erp(device);
 296         }
 297
 298         if (expires != 0)
 299                 dasd_device_set_timer(device, expires);
 300         else
 301                 dasd_device_clear_timer(device);
 302         dasd_schedule_device_bh(device);
 303
 304         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 305 }
 306
 307 /* Check whether device can be controlled by DIAG discipline. Return zero on
 308  * success, non-zero otherwise. */
 309 static int
 310 dasd_diag_check_device(struct dasd_device *device)
 311 {
 312         struct dasd_block *block;
 313         struct dasd_diag_private *private;
 314         struct dasd_diag_characteristics *rdc_data;
 315         struct dasd_diag_bio bio;
 316         struct vtoc_cms_label *label;
 317         blocknum_t end_block;
 318         unsigned int sb, bsize;
 319         int rc;
 320
 321         private = (struct dasd_diag_private *) device->private;
 322         if (private == NULL) {
 323                 private = kzalloc(sizeof(struct dasd_diag_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 = (void *) 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 = (void *) &(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         /* Figure out position of label block */
 358         switch (private->rdc_data.vdev_class) {
 359         case DEV_CLASS_FBA:
 360                 private->pt_block = 1;
 361                 break;
 362         case DEV_CLASS_ECKD:
 363                 private->pt_block = 2;
 364                 break;
 365         default:
 366                 dev_warn(&device->cdev->dev, "Device type %d is not supported "
 367                             "in DIAG mode\n", private->rdc_data.vdev_class);
 368                 rc = -EOPNOTSUPP;
 369                 goto out;
 370         }
 371
 372         DBF_DEV_EVENT(DBF_INFO, device,
 373                       "%04X: %04X on real %04X/%02X",
 374                       rdc_data->dev_nr,
 375                       rdc_data->vdev_type,
 376                       rdc_data->rdev_type, rdc_data->rdev_model);
 377
 378         /* terminate all outstanding operations */
 379         mdsk_term_io(device);
 380
 381         /* figure out blocksize of device */
 382         label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
 383         if (label == NULL)  {
 384                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 385                             "No memory to allocate initialization request");
 386                 rc = -ENOMEM;
 387                 goto out;
 388         }
 389         rc = 0;
 390         end_block = 0;
 391         /* try all sizes - needed for ECKD devices */
 392         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 393                 mdsk_init_io(device, bsize, 0, &end_block);
 394                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
 395                 bio.type = MDSK_READ_REQ;
 396                 bio.block_number = private->pt_block + 1;
 397                 bio.buffer = label;
 398                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 399                 private->iob.dev_nr = rdc_data->dev_nr;
 400                 private->iob.key = 0;
 401                 private->iob.flags = 0; /* do synchronous io */
 402                 private->iob.block_count = 1;
 403                 private->iob.interrupt_params = 0;
 404                 private->iob.bio_list = &bio;
 405                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 406                 rc = dia250(&private->iob, RW_BIO);
 407                 if (rc == 3) {
 408                         dev_warn(&device->cdev->dev,
 409                                 "A 64-bit DIAG call failed\n");
 410                         rc = -EOPNOTSUPP;
 411                         goto out_label;
 412                 }
 413                 mdsk_term_io(device);
 414                 if (rc == 0)
 415                         break;
 416         }
 417         if (bsize > PAGE_SIZE) {
 418                 dev_warn(&device->cdev->dev, "Accessing the DASD failed because"
 419                          " of an incorrect format (rc=%d)\n", rc);
 420                 rc = -EIO;
 421                 goto out_label;
 422         }
 423         /* check for label block */
 424         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 425                   sizeof(DASD_DIAG_CMS1)) == 0) {
 426                 /* get formatted blocksize from label block */
 427                 bsize = (unsigned int) label->block_size;
 428                 block->blocks = (unsigned long) label->block_count;
 429         } else
 430                 block->blocks = end_block;
 431         block->bp_block = bsize;
 432         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 433         for (sb = 512; sb < bsize; sb = sb << 1)
 434                 block->s2b_shift++;
 435         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 436         if (rc) {
 437                 dev_warn(&device->cdev->dev, "DIAG initialization "
 438                         "failed with rc=%d\n", rc);
 439                 rc = -EIO;
 440         } else {
 441                 dev_info(&device->cdev->dev,
 442                          "New DASD with %ld byte/block, total size %ld KB\n",
 443                          (unsigned long) block->bp_block,
 444                          (unsigned long) (block->blocks <<
 445                                           block->s2b_shift) >> 1);
 446         }
 447 out_label:
 448         free_page((long) label);
 449 out:
 450         if (rc) {
 451                 device->block = NULL;
 452                 dasd_free_block(block);
 453                 device->private = NULL;
 454                 kfree(private);
 455         }
 456         return rc;
 457 }
 458
 459 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 460  * otherwise. */
 461 static int
 462 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 463 {
 464         if (dasd_check_blocksize(block->bp_block) != 0)
 465                 return -EINVAL;
 466         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 467         geo->heads = 16;
 468         geo->sectors = 128 >> block->s2b_shift;
 469         return 0;
 470 }
 471
 472 static dasd_erp_fn_t
 473 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 474 {
 475         return dasd_default_erp_action;
 476 }
 477
 478 static dasd_erp_fn_t
 479 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 480 {
 481         return dasd_default_erp_postaction;
 482 }
 483
 484 /* Create DASD request from block device request. Return pointer to new
 485  * request on success, ERR_PTR otherwise. */
 486 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 487                                                struct dasd_block *block,
 488                                                struct request *req)
 489 {
 490         struct dasd_ccw_req *cqr;
 491         struct dasd_diag_req *dreq;
 492         struct dasd_diag_bio *dbio;
 493         struct req_iterator iter;
 494         struct bio_vec *bv;
 495         char *dst;
 496         unsigned int count, datasize;
 497         sector_t recid, first_rec, last_rec;
 498         unsigned int blksize, off;
 499         unsigned char rw_cmd;
 500
 501         if (rq_data_dir(req) == READ)
 502                 rw_cmd = MDSK_READ_REQ;
 503         else if (rq_data_dir(req) == WRITE)
 504                 rw_cmd = MDSK_WRITE_REQ;
 505         else
 506                 return ERR_PTR(-EINVAL);
 507         blksize = block->bp_block;
 508         /* Calculate record id of first and last block. */
 509         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 510         last_rec =
 511                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 512         /* Check struct bio and count the number of blocks for the request. */
 513         count = 0;
 514         rq_for_each_segment(bv, req, iter) {
 515                 if (bv->bv_len & (blksize - 1))
 516                         /* Fba can only do full blocks. */
 517                         return ERR_PTR(-EINVAL);
 518                 count += bv->bv_len >> (block->s2b_shift + 9);
 519         }
 520         /* Paranoia. */
 521         if (count != last_rec - first_rec + 1)
 522                 return ERR_PTR(-EINVAL);
 523         /* Build the request */
 524         datasize = sizeof(struct dasd_diag_req) +
 525                 count*sizeof(struct dasd_diag_bio);
 526         cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
 527                                    datasize, memdev);
 528         if (IS_ERR(cqr))
 529                 return cqr;
 530
 531         dreq = (struct dasd_diag_req *) cqr->data;
 532         dreq->block_count = count;
 533         dbio = dreq->bio;
 534         recid = first_rec;
 535         rq_for_each_segment(bv, req, iter) {
 536                 dst = page_address(bv->bv_page) + bv->bv_offset;
 537                 for (off = 0; off < bv->bv_len; off += blksize) {
 538                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 539                         dbio->type = rw_cmd;
 540                         dbio->block_number = recid + 1;
 541                         dbio->buffer = dst;
 542                         dbio++;
 543                         dst += blksize;
 544                         recid++;
 545                 }
 546         }
 547         cqr->retries = DIAG_MAX_RETRIES;
 548         cqr->buildclk = get_clock();
 549         if (blk_noretry_request(req) ||
 550             block->base->features & DASD_FEATURE_FAILFAST)
 551                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 552         cqr->startdev = memdev;
 553         cqr->memdev = memdev;
 554         cqr->block = block;
 555         cqr->expires = DIAG_TIMEOUT;
 556         cqr->status = DASD_CQR_FILLED;
 557         return cqr;
 558 }
 559
 560 /* Release DASD request. Return non-zero if request was successful, zero
 561  * otherwise. */
 562 static int
 563 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 564 {
 565         int status;
 566
 567         status = cqr->status == DASD_CQR_DONE;
 568         dasd_sfree_request(cqr, cqr->memdev);
 569         return status;
 570 }
 571
 572 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 573 {
 574         cqr->status = DASD_CQR_FILLED;
 575 };
 576
 577 /* Fill in IOCTL data for device. */
 578 static int
 579 dasd_diag_fill_info(struct dasd_device * device,
 580                     struct dasd_information2_t * info)
 581 {
 582         struct dasd_diag_private *private;
 583
 584         private = (struct dasd_diag_private *) device->private;
 585         info->label_block = (unsigned int) private->pt_block;
 586         info->FBA_layout = 1;
 587         info->format = DASD_FORMAT_LDL;
 588         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 589         memcpy(info->characteristics,
 590                &((struct dasd_diag_private *) device->private)->rdc_data,
 591                sizeof (struct dasd_diag_characteristics));
 592         info->confdata_size = 0;
 593         return 0;
 594 }
 595
 596 static void
 597 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 598                      struct irb *stat)
 599 {
 600         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 601                     "dump sense not available for DIAG data");
 602 }
 603
 604 static struct dasd_discipline dasd_diag_discipline = {
 605         .owner = THIS_MODULE,
 606         .name = "DIAG",
 607         .ebcname = "DIAG",
 608         .max_blocks = DIAG_MAX_BLOCKS,
 609         .check_device = dasd_diag_check_device,
 610         .fill_geometry = dasd_diag_fill_geometry,
 611         .start_IO = dasd_start_diag,
 612         .term_IO = dasd_diag_term_IO,
 613         .handle_terminated_request = dasd_diag_handle_terminated_request,
 614         .erp_action = dasd_diag_erp_action,
 615         .erp_postaction = dasd_diag_erp_postaction,
 616         .build_cp = dasd_diag_build_cp,
 617         .free_cp = dasd_diag_free_cp,
 618         .dump_sense = dasd_diag_dump_sense,
 619         .fill_info = dasd_diag_fill_info,
 620 };
 621
 622 static int __init
 623 dasd_diag_init(void)
 624 {
 625         if (!MACHINE_IS_VM) {
 626                 pr_info("Discipline %s cannot be used without z/VM\n",
 627                         dasd_diag_discipline.name);
 628                 return -ENODEV;
 629         }
 630         ASCEBC(dasd_diag_discipline.ebcname, 4);
 631
 632         ctl_set_bit(0, 9);
 633         register_external_interrupt(0x2603, dasd_ext_handler);
 634         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 635         return 0;
 636 }
 637
 638 static void __exit
 639 dasd_diag_cleanup(void)
 640 {
 641         unregister_external_interrupt(0x2603, dasd_ext_handler);
 642         ctl_clear_bit(0, 9);
 643         dasd_diag_discipline_pointer = NULL;
 644 }
 645
 646 module_init(dasd_diag_init);
 647 module_exit(dasd_diag_cleanup);