git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/stddef.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/hdreg.h>
  15 #include <linux/bio.h>
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/jiffies.h>
  19
  20 #include <asm/dasd.h>
  21 #include <asm/debug.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/s390_ext.h>
  25 #include <asm/todclk.h>
  26 #include <asm/vtoc.h>
  27
  28 #include "dasd_int.h"
  29 #include "dasd_diag.h"
  30
  31 #define PRINTK_HEADER "dasd(diag):"
  32
  33 MODULE_LICENSE("GPL");
  34
  35 /* The maximum number of blocks per request (max_blocks) is dependent on the
  36  * amount of storage that is available in the static I/O buffer for each
  37  * device. Currently each device gets 2 pages. We want to fit two requests
  38  * into the available memory so that we can immediately start the next if one
  39  * finishes. */
  40 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  41                            sizeof(struct dasd_diag_req)) / \
  42                            sizeof(struct dasd_diag_bio)) / 2)
  43 #define DIAG_MAX_RETRIES        32
  44 #define DIAG_TIMEOUT            50 * HZ
  45
  46 struct dasd_discipline dasd_diag_discipline;
  47
  48 struct dasd_diag_private {
  49         struct dasd_diag_characteristics rdc_data;
  50         struct dasd_diag_rw_io iob;
  51         struct dasd_diag_init_io iib;
  52         blocknum_t pt_block;
  53 };
  54
  55 struct dasd_diag_req {
  56         unsigned int block_count;
  57         struct dasd_diag_bio bio[0];
  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
  67 dia250(void *iob, int cmd)
  68 {
  69         typedef union {
  70                 struct dasd_diag_init_io init_io;
  71                 struct dasd_diag_rw_io rw_io;
  72         } addr_type;
  73         int rc;
  74
  75         __asm__ __volatile__(
  76 #ifdef CONFIG_64BIT
  77                 "       lghi    %0,3\n"
  78                 "       lgr     0,%3\n"
  79                 "       diag    0,%2,0x250\n"
  80                 "0:     ipm     %0\n"
  81                 "       srl     %0,28\n"
  82                 "       or      %0,1\n"
  83                 "1:\n"
  84                 ".section __ex_table,\"a\"\n"
  85                 "       .align 8\n"
  86                 "       .quad  0b,1b\n"
  87                 ".previous\n"
  88 #else
  89                 "       lhi     %0,3\n"
  90                 "       lr      0,%3\n"
  91                 "       diag    0,%2,0x250\n"
  92                 "0:     ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 "       or      %0,1\n"
  95                 "1:\n"
  96                 ".section __ex_table,\"a\"\n"
  97                 "       .align 4\n"
  98                 "       .long 0b,1b\n"
  99                 ".previous\n"
 100 #endif
 101                 : "=&d" (rc), "=m" (*(addr_type *) iob)
 102                 : "d" (cmd), "d" (iob), "m" (*(addr_type *) iob)
 103                 : "0", "1", "cc");
 104         return rc;
 105 }
 106
 107 /* Initialize block I/O to DIAG device using the specified blocksize and
 108  * block offset. On success, return zero and set end_block to contain the
 109  * number of blocks on the device minus the specified offset. Return non-zero
 110  * otherwise. */
 111 static __inline__ int
 112 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
 113              blocknum_t offset, blocknum_t *end_block)
 114 {
 115         struct dasd_diag_private *private;
 116         struct dasd_diag_init_io *iib;
 117         int rc;
 118
 119         private = (struct dasd_diag_private *) device->private;
 120         iib = &private->iib;
 121         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 122
 123         iib->dev_nr = _ccw_device_get_device_number(device->cdev);
 124         iib->block_size = blocksize;
 125         iib->offset = offset;
 126         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 127
 128         rc = dia250(iib, INIT_BIO);
 129
 130         if ((rc & 3) == 0 && end_block)
 131                 *end_block = iib->end_block;
 132
 133         return rc;
 134 }
 135
 136 /* Remove block I/O environment for device. Return zero on success, non-zero
 137  * otherwise. */
 138 static __inline__ int
 139 mdsk_term_io(struct dasd_device * device)
 140 {
 141         struct dasd_diag_private *private;
 142         struct dasd_diag_init_io *iib;
 143         int rc;
 144
 145         private = (struct dasd_diag_private *) device->private;
 146         iib = &private->iib;
 147         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 148         iib->dev_nr = _ccw_device_get_device_number(device->cdev);
 149         rc = dia250(iib, TERM_BIO);
 150         return rc;
 151 }
 152
 153 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 154  * environment. */
 155 static void
 156 dasd_diag_erp(struct dasd_device *device)
 157 {
 158         int rc;
 159
 160         mdsk_term_io(device);
 161         rc = mdsk_init_io(device, device->bp_block, 0, NULL);
 162         if (rc)
 163                 DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, "
 164                             "rc=%d", rc);
 165 }
 166
 167 /* Start a given request at the device. Return zero on success, non-zero
 168  * otherwise. */
 169 static int
 170 dasd_start_diag(struct dasd_ccw_req * cqr)
 171 {
 172         struct dasd_device *device;
 173         struct dasd_diag_private *private;
 174         struct dasd_diag_req *dreq;
 175         int rc;
 176
 177         device = cqr->device;
 178         if (cqr->retries < 0) {
 179                 DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p "
 180                             "- no retry left)", cqr);
 181                 cqr->status = DASD_CQR_FAILED;
 182                 return -EIO;
 183         }
 184         private = (struct dasd_diag_private *) device->private;
 185         dreq = (struct dasd_diag_req *) cqr->data;
 186
 187         private->iob.dev_nr = _ccw_device_get_device_number(device->cdev);
 188         private->iob.key = 0;
 189         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 190         private->iob.block_count = dreq->block_count;
 191         private->iob.interrupt_params = (addr_t) cqr;
 192         private->iob.bio_list = dreq->bio;
 193         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 194
 195         cqr->startclk = get_clock();
 196         cqr->starttime = jiffies;
 197         cqr->retries--;
 198
 199         rc = dia250(&private->iob, RW_BIO);
 200         switch (rc) {
 201         case 0: /* Synchronous I/O finished successfully */
 202                 cqr->stopclk = get_clock();
 203                 cqr->status = DASD_CQR_DONE;
 204                 /* Indicate to calling function that only a dasd_schedule_bh()
 205                    and no timer is needed */
 206                 rc = -EACCES;
 207                 break;
 208         case 8: /* Asynchronous I/O was started */
 209                 cqr->status = DASD_CQR_IN_IO;
 210                 rc = 0;
 211                 break;
 212         default: /* Error condition */
 213                 cqr->status = DASD_CQR_QUEUED;
 214                 DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc);
 215                 dasd_diag_erp(device);
 216                 rc = -EIO;
 217                 break;
 218         }
 219         return rc;
 220 }
 221
 222 /* Terminate given request at the device. */
 223 static int
 224 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 225 {
 226         struct dasd_device *device;
 227
 228         device = cqr->device;
 229         mdsk_term_io(device);
 230         mdsk_init_io(device, device->bp_block, 0, NULL);
 231         cqr->status = DASD_CQR_CLEAR;
 232         cqr->stopclk = get_clock();
 233         dasd_schedule_bh(device);
 234         return 0;
 235 }
 236
 237 /* Handle external interruption. */
 238 static void
 239 dasd_ext_handler(struct pt_regs *regs, __u16 code)
 240 {
 241         struct dasd_ccw_req *cqr, *next;
 242         struct dasd_device *device;
 243         unsigned long long expires;
 244         unsigned long flags;
 245         u8 int_code, status;
 246         addr_t ip;
 247         int rc;
 248
 249         int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
 250         status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
 251         switch (int_code) {
 252         case DASD_DIAG_CODE_31BIT:
 253                 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
 254                 break;
 255         case DASD_DIAG_CODE_64BIT:
 256                 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
 257                 break;
 258         default:
 259                 return;
 260         }
 261         if (!ip) {              /* no intparm: unsolicited interrupt */
 262                 MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt");
 263                 return;
 264         }
 265         cqr = (struct dasd_ccw_req *) ip;
 266         device = (struct dasd_device *) cqr->device;
 267         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 268                 DEV_MESSAGE(KERN_WARNING, device,
 269                             " magic number of dasd_ccw_req 0x%08X doesn't"
 270                             " match discipline 0x%08X",
 271                             cqr->magic, *(int *) (&device->discipline->name));
 272                 return;
 273         }
 274
 275         /* get irq lock to modify request queue */
 276         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 277
 278         /* Check for a pending clear operation */
 279         if (cqr->status == DASD_CQR_CLEAR) {
 280                 cqr->status = DASD_CQR_QUEUED;
 281                 dasd_clear_timer(device);
 282                 dasd_schedule_bh(device);
 283                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 284                 return;
 285         }
 286
 287         cqr->stopclk = get_clock();
 288
 289         expires = 0;
 290         if (status == 0) {
 291                 cqr->status = DASD_CQR_DONE;
 292                 /* Start first request on queue if possible -> fast_io. */
 293                 if (!list_empty(&device->ccw_queue)) {
 294                         next = list_entry(device->ccw_queue.next,
 295                                           struct dasd_ccw_req, list);
 296                         if (next->status == DASD_CQR_QUEUED) {
 297                                 rc = dasd_start_diag(next);
 298                                 if (rc == 0)
 299                                         expires = next->expires;
 300                                 else if (rc != -EACCES)
 301                                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 302                                                     "Interrupt fastpath "
 303                                                     "failed!");
 304                         }
 305                 }
 306         } else {
 307                 cqr->status = DASD_CQR_QUEUED;
 308                 DEV_MESSAGE(KERN_WARNING, device, "interrupt status for "
 309                             "request %p was %d (%d retries left)", cqr, status,
 310                             cqr->retries);
 311                 dasd_diag_erp(device);
 312         }
 313
 314         if (expires != 0)
 315                 dasd_set_timer(device, expires);
 316         else
 317                 dasd_clear_timer(device);
 318         dasd_schedule_bh(device);
 319
 320         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 321 }
 322
 323 /* Check whether device can be controlled by DIAG discipline. Return zero on
 324  * success, non-zero otherwise. */
 325 static int
 326 dasd_diag_check_device(struct dasd_device *device)
 327 {
 328         struct dasd_diag_private *private;
 329         struct dasd_diag_characteristics *rdc_data;
 330         struct dasd_diag_bio bio;
 331         struct vtoc_cms_label *label;
 332         blocknum_t end_block;
 333         unsigned int sb, bsize;
 334         int rc;
 335
 336         private = (struct dasd_diag_private *) device->private;
 337         if (private == NULL) {
 338                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 339                 if (private == NULL) {
 340                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 341                                 "memory allocation failed for private data");
 342                         return -ENOMEM;
 343                 }
 344                 device->private = (void *) private;
 345         }
 346         /* Read Device Characteristics */
 347         rdc_data = (void *) &(private->rdc_data);
 348         rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev);
 349         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 350
 351         rc = diag210((struct diag210 *) rdc_data);
 352         if (rc) {
 353                 DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device "
 354                             "information (rc=%d)", rc);
 355                 return -ENOTSUPP;
 356         }
 357
 358         /* Figure out position of label block */
 359         switch (private->rdc_data.vdev_class) {
 360         case DEV_CLASS_FBA:
 361                 private->pt_block = 1;
 362                 break;
 363         case DEV_CLASS_ECKD:
 364                 private->pt_block = 2;
 365                 break;
 366         default:
 367                 DEV_MESSAGE(KERN_WARNING, device, "unsupported device class "
 368                             "(class=%d)", private->rdc_data.vdev_class);
 369                 return -ENOTSUPP;
 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                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 385                             "No memory to allocate initialization request");
 386                 return -ENOMEM;
 387         }
 388         rc = 0;
 389         end_block = 0;
 390         /* try all sizes - needed for ECKD devices */
 391         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 392                 mdsk_init_io(device, bsize, 0, &end_block);
 393                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
 394                 bio.type = MDSK_READ_REQ;
 395                 bio.block_number = private->pt_block + 1;
 396                 bio.buffer = label;
 397                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 398                 private->iob.dev_nr = rdc_data->dev_nr;
 399                 private->iob.key = 0;
 400                 private->iob.flags = 0; /* do synchronous io */
 401                 private->iob.block_count = 1;
 402                 private->iob.interrupt_params = 0;
 403                 private->iob.bio_list = &bio;
 404                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 405                 rc = dia250(&private->iob, RW_BIO);
 406                 if (rc == 3) {
 407                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 408                                 "DIAG call failed");
 409                         rc = -EOPNOTSUPP;
 410                         goto out;
 411                 }
 412                 mdsk_term_io(device);
 413                 if (rc == 0)
 414                         break;
 415         }
 416         if (bsize > PAGE_SIZE) {
 417                 DEV_MESSAGE(KERN_WARNING, device, "device access failed "
 418                             "(rc=%d)", rc);
 419                 rc = -EIO;
 420                 goto out;
 421         }
 422         /* check for label block */
 423         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 424                   sizeof(DASD_DIAG_CMS1)) == 0) {
 425                 /* get formatted blocksize from label block */
 426                 bsize = (unsigned int) label->block_size;
 427                 device->blocks = (unsigned long) label->block_count;
 428         } else
 429                 device->blocks = end_block;
 430         device->bp_block = bsize;
 431         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 432         for (sb = 512; sb < bsize; sb = sb << 1)
 433                 device->s2b_shift++;
 434         rc = mdsk_init_io(device, device->bp_block, 0, NULL);
 435         if (rc) {
 436                 DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization "
 437                         "failed (rc=%d)", rc);
 438                 rc = -EIO;
 439         } else {
 440                 DEV_MESSAGE(KERN_INFO, device,
 441                             "(%ld B/blk): %ldkB",
 442                             (unsigned long) device->bp_block,
 443                             (unsigned long) (device->blocks <<
 444                                 device->s2b_shift) >> 1);
 445         }
 446 out:
 447         free_page((long) label);
 448         return rc;
 449 }
 450
 451 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 452  * otherwise. */
 453 static int
 454 dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 455 {
 456         if (dasd_check_blocksize(device->bp_block) != 0)
 457                 return -EINVAL;
 458         geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
 459         geo->heads = 16;
 460         geo->sectors = 128 >> device->s2b_shift;
 461         return 0;
 462 }
 463
 464 static dasd_era_t
 465 dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat)
 466 {
 467         return dasd_era_fatal;
 468 }
 469
 470 static dasd_erp_fn_t
 471 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 472 {
 473         return dasd_default_erp_action;
 474 }
 475
 476 static dasd_erp_fn_t
 477 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 478 {
 479         return dasd_default_erp_postaction;
 480 }
 481
 482 /* Create DASD request from block device request. Return pointer to new
 483  * request on success, ERR_PTR otherwise. */
 484 static struct dasd_ccw_req *
 485 dasd_diag_build_cp(struct dasd_device * device, struct request *req)
 486 {
 487         struct dasd_ccw_req *cqr;
 488         struct dasd_diag_req *dreq;
 489         struct dasd_diag_bio *dbio;
 490         struct bio *bio;
 491         struct bio_vec *bv;
 492         char *dst;
 493         unsigned int count, datasize;
 494         sector_t recid, first_rec, last_rec;
 495         unsigned int blksize, off;
 496         unsigned char rw_cmd;
 497         int i;
 498
 499         if (rq_data_dir(req) == READ)
 500                 rw_cmd = MDSK_READ_REQ;
 501         else if (rq_data_dir(req) == WRITE)
 502                 rw_cmd = MDSK_WRITE_REQ;
 503         else
 504                 return ERR_PTR(-EINVAL);
 505         blksize = device->bp_block;
 506         /* Calculate record id of first and last block. */
 507         first_rec = req->sector >> device->s2b_shift;
 508         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
 509         /* Check struct bio and count the number of blocks for the request. */
 510         count = 0;
 511         rq_for_each_bio(bio, req) {
 512                 bio_for_each_segment(bv, bio, i) {
 513                         if (bv->bv_len & (blksize - 1))
 514                                 /* Fba can only do full blocks. */
 515                                 return ERR_PTR(-EINVAL);
 516                         count += bv->bv_len >> (device->s2b_shift + 9);
 517                 }
 518         }
 519         /* Paranoia. */
 520         if (count != last_rec - first_rec + 1)
 521                 return ERR_PTR(-EINVAL);
 522         /* Build the request */
 523         datasize = sizeof(struct dasd_diag_req) +
 524                 count*sizeof(struct dasd_diag_bio);
 525         cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
 526                                    datasize, device);
 527         if (IS_ERR(cqr))
 528                 return cqr;
 529
 530         dreq = (struct dasd_diag_req *) cqr->data;
 531         dreq->block_count = count;
 532         dbio = dreq->bio;
 533         recid = first_rec;
 534         rq_for_each_bio(bio, req) {
 535                 bio_for_each_segment(bv, bio, i) {
 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         }
 548         cqr->retries = DIAG_MAX_RETRIES;
 549         cqr->buildclk = get_clock();
 550         if (req->flags & REQ_FAILFAST)
 551                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 552         cqr->device = device;
 553         cqr->expires = DIAG_TIMEOUT;
 554         cqr->status = DASD_CQR_FILLED;
 555         return cqr;
 556 }
 557
 558 /* Release DASD request. Return non-zero if request was successful, zero
 559  * otherwise. */
 560 static int
 561 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 562 {
 563         int status;
 564
 565         status = cqr->status == DASD_CQR_DONE;
 566         dasd_sfree_request(cqr, cqr->device);
 567         return status;
 568 }
 569
 570 /* Fill in IOCTL data for device. */
 571 static int
 572 dasd_diag_fill_info(struct dasd_device * device,
 573                     struct dasd_information2_t * info)
 574 {
 575         struct dasd_diag_private *private;
 576
 577         private = (struct dasd_diag_private *) device->private;
 578         info->label_block = (unsigned int) private->pt_block;
 579         info->FBA_layout = 1;
 580         info->format = DASD_FORMAT_LDL;
 581         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 582         memcpy(info->characteristics,
 583                &((struct dasd_diag_private *) device->private)->rdc_data,
 584                sizeof (struct dasd_diag_characteristics));
 585         info->confdata_size = 0;
 586         return 0;
 587 }
 588
 589 static void
 590 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 591                      struct irb *stat)
 592 {
 593         DEV_MESSAGE(KERN_ERR, device, "%s",
 594                     "dump sense not available for DIAG data");
 595 }
 596
 597 struct dasd_discipline dasd_diag_discipline = {
 598         .owner = THIS_MODULE,
 599         .name = "DIAG",
 600         .ebcname = "DIAG",
 601         .max_blocks = DIAG_MAX_BLOCKS,
 602         .check_device = dasd_diag_check_device,
 603         .fill_geometry = dasd_diag_fill_geometry,
 604         .start_IO = dasd_start_diag,
 605         .term_IO = dasd_diag_term_IO,
 606         .examine_error = dasd_diag_examine_error,
 607         .erp_action = dasd_diag_erp_action,
 608         .erp_postaction = dasd_diag_erp_postaction,
 609         .build_cp = dasd_diag_build_cp,
 610         .free_cp = dasd_diag_free_cp,
 611         .dump_sense = dasd_diag_dump_sense,
 612         .fill_info = dasd_diag_fill_info,
 613 };
 614
 615 static int __init
 616 dasd_diag_init(void)
 617 {
 618         if (!MACHINE_IS_VM) {
 619                 MESSAGE_LOG(KERN_INFO,
 620                             "Machine is not VM: %s "
 621                             "discipline not initializing",
 622                             dasd_diag_discipline.name);
 623                 return -ENODEV;
 624         }
 625         ASCEBC(dasd_diag_discipline.ebcname, 4);
 626
 627         ctl_set_bit(0, 9);
 628         register_external_interrupt(0x2603, dasd_ext_handler);
 629         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 630         return 0;
 631 }
 632
 633 static void __exit
 634 dasd_diag_cleanup(void)
 635 {
 636         unregister_external_interrupt(0x2603, dasd_ext_handler);
 637         ctl_clear_bit(0, 9);
 638         dasd_diag_discipline_pointer = NULL;
 639 }
 640
 641 module_init(dasd_diag_init);
 642 module_exit(dasd_diag_cleanup);