1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Based on.......: linux/drivers/s390/block/mdisk.c 5 * ...............: by Hartmunt Penner <hpenner@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Copyright IBM Corp. 1999, 2000 8 * 9 */ 10 11 #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/diag.h> 26 #include <asm/ebcdic.h> 27 #include <asm/io.h> 28 #include <asm/irq.h> 29 #include <asm/vtoc.h> 30 #include <asm/diag.h> 31 32 #include "dasd_int.h" 33 #include "dasd_diag.h" 34 35 #define PRINTK_HEADER "dasd(diag):" 36 37 MODULE_LICENSE("GPL"); 38 39 /* The maximum number of blocks per request (max_blocks) is dependent on the 40 * amount of storage that is available in the static I/O buffer for each 41 * device. Currently each device gets 2 pages. We want to fit two requests 42 * into the available memory so that we can immediately start the next if one 43 * finishes. */ 44 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ 45 sizeof(struct dasd_diag_req)) / \ 46 sizeof(struct dasd_diag_bio)) / 2) 47 #define DIAG_MAX_RETRIES 32 48 #define DIAG_TIMEOUT 50 49 50 static struct dasd_discipline dasd_diag_discipline; 51 52 struct dasd_diag_private { 53 struct dasd_diag_characteristics rdc_data; 54 struct dasd_diag_rw_io iob; 55 struct dasd_diag_init_io iib; 56 blocknum_t pt_block; 57 struct ccw_dev_id dev_id; 58 }; 59 60 struct dasd_diag_req { 61 unsigned int block_count; 62 struct dasd_diag_bio bio[0]; 63 }; 64 65 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ 66 67 /* Perform DIAG250 call with block I/O parameter list iob (input and output) 68 * and function code cmd. 69 * In case of an exception return 3. Otherwise return result of bitwise OR of 70 * resulting condition code and DIAG return code. */ 71 static inline int __dia250(void *iob, int cmd) 72 { 73 register unsigned long reg2 asm ("2") = (unsigned long) iob; 74 typedef union { 75 struct dasd_diag_init_io init_io; 76 struct dasd_diag_rw_io rw_io; 77 } addr_type; 78 int rc; 79 80 rc = 3; 81 asm volatile( 82 " diag 2,%2,0x250\n" 83 "0: ipm %0\n" 84 " srl %0,28\n" 85 " or %0,3\n" 86 "1:\n" 87 EX_TABLE(0b,1b) 88 : "+d" (rc), "=m" (*(addr_type *) iob) 89 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) 90 : "3", "cc"); 91 return rc; 92 } 93 94 static inline int dia250(void *iob, int cmd) 95 { 96 diag_stat_inc(DIAG_STAT_X250); 97 return __dia250(iob, cmd); 98 } 99 100 /* Initialize block I/O to DIAG device using the specified blocksize and 101 * block offset. On success, return zero and set end_block to contain the 102 * number of blocks on the device minus the specified offset. Return non-zero 103 * otherwise. */ 104 static inline int 105 mdsk_init_io(struct dasd_device *device, unsigned int blocksize, 106 blocknum_t offset, blocknum_t *end_block) 107 { 108 struct dasd_diag_private *private = device->private; 109 struct dasd_diag_init_io *iib = &private->iib; 110 int rc; 111 112 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 113 114 iib->dev_nr = private->dev_id.devno; 115 iib->block_size = blocksize; 116 iib->offset = offset; 117 iib->flaga = DASD_DIAG_FLAGA_DEFAULT; 118 119 rc = dia250(iib, INIT_BIO); 120 121 if ((rc & 3) == 0 && end_block) 122 *end_block = iib->end_block; 123 124 return rc; 125 } 126 127 /* Remove block I/O environment for device. Return zero on success, non-zero 128 * otherwise. */ 129 static inline int 130 mdsk_term_io(struct dasd_device * device) 131 { 132 struct dasd_diag_private *private = device->private; 133 struct dasd_diag_init_io *iib = &private->iib; 134 int rc; 135 136 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 137 iib->dev_nr = private->dev_id.devno; 138 rc = dia250(iib, TERM_BIO); 139 return rc; 140 } 141 142 /* Error recovery for failed DIAG requests - try to reestablish the DIAG 143 * environment. */ 144 static void 145 dasd_diag_erp(struct dasd_device *device) 146 { 147 int rc; 148 149 mdsk_term_io(device); 150 rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); 151 if (rc == 4) { 152 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags))) 153 pr_warn("%s: The access mode of a DIAG device changed to read-only\n", 154 dev_name(&device->cdev->dev)); 155 rc = 0; 156 } 157 if (rc) 158 pr_warn("%s: DIAG ERP failed with rc=%d\n", 159 dev_name(&device->cdev->dev), rc); 160 } 161 162 /* Start a given request at the device. Return zero on success, non-zero 163 * otherwise. */ 164 static int 165 dasd_start_diag(struct dasd_ccw_req * cqr) 166 { 167 struct dasd_device *device; 168 struct dasd_diag_private *private; 169 struct dasd_diag_req *dreq; 170 int rc; 171 172 device = cqr->startdev; 173 if (cqr->retries < 0) { 174 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " 175 "- no retry left)", cqr); 176 cqr->status = DASD_CQR_ERROR; 177 return -EIO; 178 } 179 private = device->private; 180 dreq = cqr->data; 181 182 private->iob.dev_nr = private->dev_id.devno; 183 private->iob.key = 0; 184 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; 185 private->iob.block_count = dreq->block_count; 186 private->iob.interrupt_params = (addr_t) cqr; 187 private->iob.bio_list = dreq->bio; 188 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 189 190 cqr->startclk = get_tod_clock(); 191 cqr->starttime = jiffies; 192 cqr->retries--; 193 194 rc = dia250(&private->iob, RW_BIO); 195 switch (rc) { 196 case 0: /* Synchronous I/O finished successfully */ 197 cqr->stopclk = get_tod_clock(); 198 cqr->status = DASD_CQR_SUCCESS; 199 /* Indicate to calling function that only a dasd_schedule_bh() 200 and no timer is needed */ 201 rc = -EACCES; 202 break; 203 case 8: /* Asynchronous I/O was started */ 204 cqr->status = DASD_CQR_IN_IO; 205 rc = 0; 206 break; 207 default: /* Error condition */ 208 cqr->status = DASD_CQR_QUEUED; 209 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); 210 dasd_diag_erp(device); 211 rc = -EIO; 212 break; 213 } 214 cqr->intrc = rc; 215 return rc; 216 } 217 218 /* Terminate given request at the device. */ 219 static int 220 dasd_diag_term_IO(struct dasd_ccw_req * cqr) 221 { 222 struct dasd_device *device; 223 224 device = cqr->startdev; 225 mdsk_term_io(device); 226 mdsk_init_io(device, device->block->bp_block, 0, NULL); 227 cqr->status = DASD_CQR_CLEAR_PENDING; 228 cqr->stopclk = get_tod_clock(); 229 dasd_schedule_device_bh(device); 230 return 0; 231 } 232 233 /* Handle external interruption. */ 234 static void dasd_ext_handler(struct ext_code ext_code, 235 unsigned int param32, unsigned long param64) 236 { 237 struct dasd_ccw_req *cqr, *next; 238 struct dasd_device *device; 239 unsigned long expires; 240 unsigned long flags; 241 addr_t ip; 242 int rc; 243 244 switch (ext_code.subcode >> 8) { 245 case DASD_DIAG_CODE_31BIT: 246 ip = (addr_t) param32; 247 break; 248 case DASD_DIAG_CODE_64BIT: 249 ip = (addr_t) param64; 250 break; 251 default: 252 return; 253 } 254 inc_irq_stat(IRQEXT_DSD); 255 if (!ip) { /* no intparm: unsolicited interrupt */ 256 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " 257 "interrupt"); 258 return; 259 } 260 cqr = (struct dasd_ccw_req *) ip; 261 device = (struct dasd_device *) cqr->startdev; 262 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 263 DBF_DEV_EVENT(DBF_WARNING, device, 264 " magic number of dasd_ccw_req 0x%08X doesn't" 265 " match discipline 0x%08X", 266 cqr->magic, *(int *) (&device->discipline->name)); 267 return; 268 } 269 270 /* get irq lock to modify request queue */ 271 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 272 273 /* Check for a pending clear operation */ 274 if (cqr->status == DASD_CQR_CLEAR_PENDING) { 275 cqr->status = DASD_CQR_CLEARED; 276 dasd_device_clear_timer(device); 277 dasd_schedule_device_bh(device); 278 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 279 return; 280 } 281 282 cqr->stopclk = get_tod_clock(); 283 284 expires = 0; 285 if ((ext_code.subcode & 0xff) == 0) { 286 cqr->status = DASD_CQR_SUCCESS; 287 /* Start first request on queue if possible -> fast_io. */ 288 if (!list_empty(&device->ccw_queue)) { 289 next = list_entry(device->ccw_queue.next, 290 struct dasd_ccw_req, devlist); 291 if (next->status == DASD_CQR_QUEUED) { 292 rc = dasd_start_diag(next); 293 if (rc == 0) 294 expires = next->expires; 295 } 296 } 297 } else { 298 cqr->status = DASD_CQR_QUEUED; 299 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " 300 "request %p was %d (%d retries left)", cqr, 301 ext_code.subcode & 0xff, cqr->retries); 302 dasd_diag_erp(device); 303 } 304 305 if (expires != 0) 306 dasd_device_set_timer(device, expires); 307 else 308 dasd_device_clear_timer(device); 309 dasd_schedule_device_bh(device); 310 311 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 312 } 313 314 /* Check whether device can be controlled by DIAG discipline. Return zero on 315 * success, non-zero otherwise. */ 316 static int 317 dasd_diag_check_device(struct dasd_device *device) 318 { 319 struct dasd_diag_private *private = device->private; 320 struct dasd_diag_characteristics *rdc_data; 321 struct vtoc_cms_label *label; 322 struct dasd_block *block; 323 struct dasd_diag_bio bio; 324 unsigned int sb, bsize; 325 blocknum_t end_block; 326 int rc; 327 328 if (private == NULL) { 329 private = kzalloc(sizeof(*private), GFP_KERNEL); 330 if (private == NULL) { 331 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 332 "Allocating memory for private DASD data " 333 "failed\n"); 334 return -ENOMEM; 335 } 336 ccw_device_get_id(device->cdev, &private->dev_id); 337 device->private = private; 338 } 339 block = dasd_alloc_block(); 340 if (IS_ERR(block)) { 341 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 342 "could not allocate dasd block structure"); 343 device->private = NULL; 344 kfree(private); 345 return PTR_ERR(block); 346 } 347 device->block = block; 348 block->base = device; 349 350 /* Read Device Characteristics */ 351 rdc_data = &private->rdc_data; 352 rdc_data->dev_nr = private->dev_id.devno; 353 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); 354 355 rc = diag210((struct diag210 *) rdc_data); 356 if (rc) { 357 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " 358 "information (rc=%d)", rc); 359 rc = -EOPNOTSUPP; 360 goto out; 361 } 362 363 device->default_expires = DIAG_TIMEOUT; 364 device->default_retries = DIAG_MAX_RETRIES; 365 366 /* Figure out position of label block */ 367 switch (private->rdc_data.vdev_class) { 368 case DEV_CLASS_FBA: 369 private->pt_block = 1; 370 break; 371 case DEV_CLASS_ECKD: 372 private->pt_block = 2; 373 break; 374 default: 375 pr_warn("%s: Device type %d is not supported in DIAG mode\n", 376 dev_name(&device->cdev->dev), 377 private->rdc_data.vdev_class); 378 rc = -EOPNOTSUPP; 379 goto out; 380 } 381 382 DBF_DEV_EVENT(DBF_INFO, device, 383 "%04X: %04X on real %04X/%02X", 384 rdc_data->dev_nr, 385 rdc_data->vdev_type, 386 rdc_data->rdev_type, rdc_data->rdev_model); 387 388 /* terminate all outstanding operations */ 389 mdsk_term_io(device); 390 391 /* figure out blocksize of device */ 392 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); 393 if (label == NULL) { 394 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 395 "No memory to allocate initialization request"); 396 rc = -ENOMEM; 397 goto out; 398 } 399 rc = 0; 400 end_block = 0; 401 /* try all sizes - needed for ECKD devices */ 402 for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { 403 mdsk_init_io(device, bsize, 0, &end_block); 404 memset(&bio, 0, sizeof (struct dasd_diag_bio)); 405 bio.type = MDSK_READ_REQ; 406 bio.block_number = private->pt_block + 1; 407 bio.buffer = label; 408 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); 409 private->iob.dev_nr = rdc_data->dev_nr; 410 private->iob.key = 0; 411 private->iob.flags = 0; /* do synchronous io */ 412 private->iob.block_count = 1; 413 private->iob.interrupt_params = 0; 414 private->iob.bio_list = &bio; 415 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 416 rc = dia250(&private->iob, RW_BIO); 417 if (rc == 3) { 418 pr_warn("%s: A 64-bit DIAG call failed\n", 419 dev_name(&device->cdev->dev)); 420 rc = -EOPNOTSUPP; 421 goto out_label; 422 } 423 mdsk_term_io(device); 424 if (rc == 0) 425 break; 426 } 427 if (bsize > PAGE_SIZE) { 428 pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n", 429 dev_name(&device->cdev->dev), rc); 430 rc = -EIO; 431 goto out_label; 432 } 433 /* check for label block */ 434 if (memcmp(label->label_id, DASD_DIAG_CMS1, 435 sizeof(DASD_DIAG_CMS1)) == 0) { 436 /* get formatted blocksize from label block */ 437 bsize = (unsigned int) label->block_size; 438 block->blocks = (unsigned long) label->block_count; 439 } else 440 block->blocks = end_block; 441 block->bp_block = bsize; 442 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 443 for (sb = 512; sb < bsize; sb = sb << 1) 444 block->s2b_shift++; 445 rc = mdsk_init_io(device, block->bp_block, 0, NULL); 446 if (rc && (rc != 4)) { 447 pr_warn("%s: DIAG initialization failed with rc=%d\n", 448 dev_name(&device->cdev->dev), rc); 449 rc = -EIO; 450 } else { 451 if (rc == 4) 452 set_bit(DASD_FLAG_DEVICE_RO, &device->flags); 453 pr_info("%s: New DASD with %ld byte/block, total size %ld " 454 "KB%s\n", dev_name(&device->cdev->dev), 455 (unsigned long) block->bp_block, 456 (unsigned long) (block->blocks << 457 block->s2b_shift) >> 1, 458 (rc == 4) ? ", read-only device" : ""); 459 rc = 0; 460 } 461 out_label: 462 free_page((long) label); 463 out: 464 if (rc) { 465 device->block = NULL; 466 dasd_free_block(block); 467 device->private = NULL; 468 kfree(private); 469 } 470 return rc; 471 } 472 473 /* Fill in virtual disk geometry for device. Return zero on success, non-zero 474 * otherwise. */ 475 static int 476 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) 477 { 478 if (dasd_check_blocksize(block->bp_block) != 0) 479 return -EINVAL; 480 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 481 geo->heads = 16; 482 geo->sectors = 128 >> block->s2b_shift; 483 return 0; 484 } 485 486 static dasd_erp_fn_t 487 dasd_diag_erp_action(struct dasd_ccw_req * cqr) 488 { 489 return dasd_default_erp_action; 490 } 491 492 static dasd_erp_fn_t 493 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) 494 { 495 return dasd_default_erp_postaction; 496 } 497 498 /* Create DASD request from block device request. Return pointer to new 499 * request on success, ERR_PTR otherwise. */ 500 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, 501 struct dasd_block *block, 502 struct request *req) 503 { 504 struct dasd_ccw_req *cqr; 505 struct dasd_diag_req *dreq; 506 struct dasd_diag_bio *dbio; 507 struct req_iterator iter; 508 struct bio_vec bv; 509 char *dst; 510 unsigned int count, datasize; 511 sector_t recid, first_rec, last_rec; 512 unsigned int blksize, off; 513 unsigned char rw_cmd; 514 515 if (rq_data_dir(req) == READ) 516 rw_cmd = MDSK_READ_REQ; 517 else if (rq_data_dir(req) == WRITE) 518 rw_cmd = MDSK_WRITE_REQ; 519 else 520 return ERR_PTR(-EINVAL); 521 blksize = block->bp_block; 522 /* Calculate record id of first and last block. */ 523 first_rec = blk_rq_pos(req) >> block->s2b_shift; 524 last_rec = 525 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 526 /* Check struct bio and count the number of blocks for the request. */ 527 count = 0; 528 rq_for_each_segment(bv, req, iter) { 529 if (bv.bv_len & (blksize - 1)) 530 /* Fba can only do full blocks. */ 531 return ERR_PTR(-EINVAL); 532 count += bv.bv_len >> (block->s2b_shift + 9); 533 } 534 /* Paranoia. */ 535 if (count != last_rec - first_rec + 1) 536 return ERR_PTR(-EINVAL); 537 /* Build the request */ 538 datasize = sizeof(struct dasd_diag_req) + 539 count*sizeof(struct dasd_diag_bio); 540 cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev); 541 if (IS_ERR(cqr)) 542 return cqr; 543 544 dreq = (struct dasd_diag_req *) cqr->data; 545 dreq->block_count = count; 546 dbio = dreq->bio; 547 recid = first_rec; 548 rq_for_each_segment(bv, req, iter) { 549 dst = page_address(bv.bv_page) + bv.bv_offset; 550 for (off = 0; off < bv.bv_len; off += blksize) { 551 memset(dbio, 0, sizeof (struct dasd_diag_bio)); 552 dbio->type = rw_cmd; 553 dbio->block_number = recid + 1; 554 dbio->buffer = dst; 555 dbio++; 556 dst += blksize; 557 recid++; 558 } 559 } 560 cqr->retries = memdev->default_retries; 561 cqr->buildclk = get_tod_clock(); 562 if (blk_noretry_request(req) || 563 block->base->features & DASD_FEATURE_FAILFAST) 564 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 565 cqr->startdev = memdev; 566 cqr->memdev = memdev; 567 cqr->block = block; 568 cqr->expires = memdev->default_expires * HZ; 569 cqr->status = DASD_CQR_FILLED; 570 return cqr; 571 } 572 573 /* Release DASD request. Return non-zero if request was successful, zero 574 * otherwise. */ 575 static int 576 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) 577 { 578 int status; 579 580 status = cqr->status == DASD_CQR_DONE; 581 dasd_sfree_request(cqr, cqr->memdev); 582 return status; 583 } 584 585 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) 586 { 587 if (cqr->retries < 0) 588 cqr->status = DASD_CQR_FAILED; 589 else 590 cqr->status = DASD_CQR_FILLED; 591 }; 592 593 /* Fill in IOCTL data for device. */ 594 static int 595 dasd_diag_fill_info(struct dasd_device * device, 596 struct dasd_information2_t * info) 597 { 598 struct dasd_diag_private *private = device->private; 599 600 info->label_block = (unsigned int) private->pt_block; 601 info->FBA_layout = 1; 602 info->format = DASD_FORMAT_LDL; 603 info->characteristics_size = sizeof(private->rdc_data); 604 memcpy(info->characteristics, &private->rdc_data, 605 sizeof(private->rdc_data)); 606 info->confdata_size = 0; 607 return 0; 608 } 609 610 static void 611 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 612 struct irb *stat) 613 { 614 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 615 "dump sense not available for DIAG data"); 616 } 617 618 static struct dasd_discipline dasd_diag_discipline = { 619 .owner = THIS_MODULE, 620 .name = "DIAG", 621 .ebcname = "DIAG", 622 .max_blocks = DIAG_MAX_BLOCKS, 623 .check_device = dasd_diag_check_device, 624 .verify_path = dasd_generic_verify_path, 625 .fill_geometry = dasd_diag_fill_geometry, 626 .start_IO = dasd_start_diag, 627 .term_IO = dasd_diag_term_IO, 628 .handle_terminated_request = dasd_diag_handle_terminated_request, 629 .erp_action = dasd_diag_erp_action, 630 .erp_postaction = dasd_diag_erp_postaction, 631 .build_cp = dasd_diag_build_cp, 632 .free_cp = dasd_diag_free_cp, 633 .dump_sense = dasd_diag_dump_sense, 634 .fill_info = dasd_diag_fill_info, 635 }; 636 637 static int __init 638 dasd_diag_init(void) 639 { 640 if (!MACHINE_IS_VM) { 641 pr_info("Discipline %s cannot be used without z/VM\n", 642 dasd_diag_discipline.name); 643 return -ENODEV; 644 } 645 ASCEBC(dasd_diag_discipline.ebcname, 4); 646 647 irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); 648 register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); 649 dasd_diag_discipline_pointer = &dasd_diag_discipline; 650 return 0; 651 } 652 653 static void __exit 654 dasd_diag_cleanup(void) 655 { 656 unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); 657 irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); 658 dasd_diag_discipline_pointer = NULL; 659 } 660 661 module_init(dasd_diag_init); 662 module_exit(dasd_diag_cleanup); 663