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 return rc; 206 } 207 208 /* Terminate given request at the device. */ 209 static int 210 dasd_diag_term_IO(struct dasd_ccw_req * cqr) 211 { 212 struct dasd_device *device; 213 214 device = cqr->startdev; 215 mdsk_term_io(device); 216 mdsk_init_io(device, device->block->bp_block, 0, NULL); 217 cqr->status = DASD_CQR_CLEAR_PENDING; 218 cqr->stopclk = get_clock(); 219 dasd_schedule_device_bh(device); 220 return 0; 221 } 222 223 /* Handle external interruption. */ 224 static void 225 dasd_ext_handler(__u16 code) 226 { 227 struct dasd_ccw_req *cqr, *next; 228 struct dasd_device *device; 229 unsigned long long expires; 230 unsigned long flags; 231 u8 int_code, status; 232 addr_t ip; 233 int rc; 234 235 int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); 236 status = *((u8 *) DASD_DIAG_LC_INT_STATUS); 237 switch (int_code) { 238 case DASD_DIAG_CODE_31BIT: 239 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); 240 break; 241 case DASD_DIAG_CODE_64BIT: 242 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); 243 break; 244 default: 245 return; 246 } 247 if (!ip) { /* no intparm: unsolicited interrupt */ 248 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " 249 "interrupt"); 250 return; 251 } 252 cqr = (struct dasd_ccw_req *) ip; 253 device = (struct dasd_device *) cqr->startdev; 254 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 255 DBF_DEV_EVENT(DBF_WARNING, device, 256 " magic number of dasd_ccw_req 0x%08X doesn't" 257 " match discipline 0x%08X", 258 cqr->magic, *(int *) (&device->discipline->name)); 259 return; 260 } 261 262 /* get irq lock to modify request queue */ 263 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 264 265 /* Check for a pending clear operation */ 266 if (cqr->status == DASD_CQR_CLEAR_PENDING) { 267 cqr->status = DASD_CQR_CLEARED; 268 dasd_device_clear_timer(device); 269 dasd_schedule_device_bh(device); 270 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 271 return; 272 } 273 274 cqr->stopclk = get_clock(); 275 276 expires = 0; 277 if (status == 0) { 278 cqr->status = DASD_CQR_SUCCESS; 279 /* Start first request on queue if possible -> fast_io. */ 280 if (!list_empty(&device->ccw_queue)) { 281 next = list_entry(device->ccw_queue.next, 282 struct dasd_ccw_req, devlist); 283 if (next->status == DASD_CQR_QUEUED) { 284 rc = dasd_start_diag(next); 285 if (rc == 0) 286 expires = next->expires; 287 } 288 } 289 } else { 290 cqr->status = DASD_CQR_QUEUED; 291 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " 292 "request %p was %d (%d retries left)", cqr, status, 293 cqr->retries); 294 dasd_diag_erp(device); 295 } 296 297 if (expires != 0) 298 dasd_device_set_timer(device, expires); 299 else 300 dasd_device_clear_timer(device); 301 dasd_schedule_device_bh(device); 302 303 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 304 } 305 306 /* Check whether device can be controlled by DIAG discipline. Return zero on 307 * success, non-zero otherwise. */ 308 static int 309 dasd_diag_check_device(struct dasd_device *device) 310 { 311 struct dasd_block *block; 312 struct dasd_diag_private *private; 313 struct dasd_diag_characteristics *rdc_data; 314 struct dasd_diag_bio bio; 315 struct vtoc_cms_label *label; 316 blocknum_t end_block; 317 unsigned int sb, bsize; 318 int rc; 319 320 private = (struct dasd_diag_private *) device->private; 321 if (private == NULL) { 322 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); 323 if (private == NULL) { 324 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 325 "Allocating memory for private DASD data " 326 "failed\n"); 327 return -ENOMEM; 328 } 329 ccw_device_get_id(device->cdev, &private->dev_id); 330 device->private = (void *) private; 331 } 332 block = dasd_alloc_block(); 333 if (IS_ERR(block)) { 334 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 335 "could not allocate dasd block structure"); 336 device->private = NULL; 337 kfree(private); 338 return PTR_ERR(block); 339 } 340 device->block = block; 341 block->base = device; 342 343 /* Read Device Characteristics */ 344 rdc_data = (void *) &(private->rdc_data); 345 rdc_data->dev_nr = private->dev_id.devno; 346 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); 347 348 rc = diag210((struct diag210 *) rdc_data); 349 if (rc) { 350 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " 351 "information (rc=%d)", rc); 352 rc = -EOPNOTSUPP; 353 goto out; 354 } 355 356 /* Figure out position of label block */ 357 switch (private->rdc_data.vdev_class) { 358 case DEV_CLASS_FBA: 359 private->pt_block = 1; 360 break; 361 case DEV_CLASS_ECKD: 362 private->pt_block = 2; 363 break; 364 default: 365 dev_warn(&device->cdev->dev, "Device type %d is not supported " 366 "in DIAG mode\n", private->rdc_data.vdev_class); 367 rc = -EOPNOTSUPP; 368 goto out; 369 } 370 371 DBF_DEV_EVENT(DBF_INFO, device, 372 "%04X: %04X on real %04X/%02X", 373 rdc_data->dev_nr, 374 rdc_data->vdev_type, 375 rdc_data->rdev_type, rdc_data->rdev_model); 376 377 /* terminate all outstanding operations */ 378 mdsk_term_io(device); 379 380 /* figure out blocksize of device */ 381 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); 382 if (label == NULL) { 383 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 384 "No memory to allocate initialization request"); 385 rc = -ENOMEM; 386 goto out; 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_warn(&device->cdev->dev, 408 "A 64-bit DIAG call failed\n"); 409 rc = -EOPNOTSUPP; 410 goto out_label; 411 } 412 mdsk_term_io(device); 413 if (rc == 0) 414 break; 415 } 416 if (bsize > PAGE_SIZE) { 417 dev_warn(&device->cdev->dev, "Accessing the DASD failed because" 418 " of an incorrect format (rc=%d)\n", rc); 419 rc = -EIO; 420 goto out_label; 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 block->blocks = (unsigned long) label->block_count; 428 } else 429 block->blocks = end_block; 430 block->bp_block = bsize; 431 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 432 for (sb = 512; sb < bsize; sb = sb << 1) 433 block->s2b_shift++; 434 rc = mdsk_init_io(device, block->bp_block, 0, NULL); 435 if (rc) { 436 dev_warn(&device->cdev->dev, "DIAG initialization " 437 "failed with rc=%d\n", rc); 438 rc = -EIO; 439 } else { 440 dev_info(&device->cdev->dev, 441 "New DASD with %ld byte/block, total size %ld KB\n", 442 (unsigned long) block->bp_block, 443 (unsigned long) (block->blocks << 444 block->s2b_shift) >> 1); 445 } 446 out_label: 447 free_page((long) label); 448 out: 449 if (rc) { 450 device->block = NULL; 451 dasd_free_block(block); 452 device->private = NULL; 453 kfree(private); 454 } 455 return rc; 456 } 457 458 /* Fill in virtual disk geometry for device. Return zero on success, non-zero 459 * otherwise. */ 460 static int 461 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) 462 { 463 if (dasd_check_blocksize(block->bp_block) != 0) 464 return -EINVAL; 465 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 466 geo->heads = 16; 467 geo->sectors = 128 >> block->s2b_shift; 468 return 0; 469 } 470 471 static dasd_erp_fn_t 472 dasd_diag_erp_action(struct dasd_ccw_req * cqr) 473 { 474 return dasd_default_erp_action; 475 } 476 477 static dasd_erp_fn_t 478 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) 479 { 480 return dasd_default_erp_postaction; 481 } 482 483 /* Create DASD request from block device request. Return pointer to new 484 * request on success, ERR_PTR otherwise. */ 485 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, 486 struct dasd_block *block, 487 struct request *req) 488 { 489 struct dasd_ccw_req *cqr; 490 struct dasd_diag_req *dreq; 491 struct dasd_diag_bio *dbio; 492 struct req_iterator iter; 493 struct bio_vec *bv; 494 char *dst; 495 unsigned int count, datasize; 496 sector_t recid, first_rec, last_rec; 497 unsigned int blksize, off; 498 unsigned char rw_cmd; 499 500 if (rq_data_dir(req) == READ) 501 rw_cmd = MDSK_READ_REQ; 502 else if (rq_data_dir(req) == WRITE) 503 rw_cmd = MDSK_WRITE_REQ; 504 else 505 return ERR_PTR(-EINVAL); 506 blksize = block->bp_block; 507 /* Calculate record id of first and last block. */ 508 first_rec = blk_rq_pos(req) >> block->s2b_shift; 509 last_rec = 510 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 511 /* Check struct bio and count the number of blocks for the request. */ 512 count = 0; 513 rq_for_each_segment(bv, req, iter) { 514 if (bv->bv_len & (blksize - 1)) 515 /* Fba can only do full blocks. */ 516 return ERR_PTR(-EINVAL); 517 count += bv->bv_len >> (block->s2b_shift + 9); 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, memdev); 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_segment(bv, req, iter) { 535 dst = page_address(bv->bv_page) + bv->bv_offset; 536 for (off = 0; off < bv->bv_len; off += blksize) { 537 memset(dbio, 0, sizeof (struct dasd_diag_bio)); 538 dbio->type = rw_cmd; 539 dbio->block_number = recid + 1; 540 dbio->buffer = dst; 541 dbio++; 542 dst += blksize; 543 recid++; 544 } 545 } 546 cqr->retries = DIAG_MAX_RETRIES; 547 cqr->buildclk = get_clock(); 548 if (blk_noretry_request(req) || 549 block->base->features & DASD_FEATURE_FAILFAST) 550 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 551 cqr->startdev = memdev; 552 cqr->memdev = memdev; 553 cqr->block = block; 554 cqr->expires = DIAG_TIMEOUT; 555 cqr->status = DASD_CQR_FILLED; 556 return cqr; 557 } 558 559 /* Release DASD request. Return non-zero if request was successful, zero 560 * otherwise. */ 561 static int 562 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) 563 { 564 int status; 565 566 status = cqr->status == DASD_CQR_DONE; 567 dasd_sfree_request(cqr, cqr->memdev); 568 return status; 569 } 570 571 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) 572 { 573 cqr->status = DASD_CQR_FILLED; 574 }; 575 576 /* Fill in IOCTL data for device. */ 577 static int 578 dasd_diag_fill_info(struct dasd_device * device, 579 struct dasd_information2_t * info) 580 { 581 struct dasd_diag_private *private; 582 583 private = (struct dasd_diag_private *) device->private; 584 info->label_block = (unsigned int) private->pt_block; 585 info->FBA_layout = 1; 586 info->format = DASD_FORMAT_LDL; 587 info->characteristics_size = sizeof (struct dasd_diag_characteristics); 588 memcpy(info->characteristics, 589 &((struct dasd_diag_private *) device->private)->rdc_data, 590 sizeof (struct dasd_diag_characteristics)); 591 info->confdata_size = 0; 592 return 0; 593 } 594 595 static void 596 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 597 struct irb *stat) 598 { 599 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 600 "dump sense not available for DIAG data"); 601 } 602 603 static struct dasd_discipline dasd_diag_discipline = { 604 .owner = THIS_MODULE, 605 .name = "DIAG", 606 .ebcname = "DIAG", 607 .max_blocks = DIAG_MAX_BLOCKS, 608 .check_device = dasd_diag_check_device, 609 .fill_geometry = dasd_diag_fill_geometry, 610 .start_IO = dasd_start_diag, 611 .term_IO = dasd_diag_term_IO, 612 .handle_terminated_request = dasd_diag_handle_terminated_request, 613 .erp_action = dasd_diag_erp_action, 614 .erp_postaction = dasd_diag_erp_postaction, 615 .build_cp = dasd_diag_build_cp, 616 .free_cp = dasd_diag_free_cp, 617 .dump_sense = dasd_diag_dump_sense, 618 .fill_info = dasd_diag_fill_info, 619 }; 620 621 static int __init 622 dasd_diag_init(void) 623 { 624 if (!MACHINE_IS_VM) { 625 pr_info("Discipline %s cannot be used without z/VM\n", 626 dasd_diag_discipline.name); 627 return -ENODEV; 628 } 629 ASCEBC(dasd_diag_discipline.ebcname, 4); 630 631 ctl_set_bit(0, 9); 632 register_external_interrupt(0x2603, dasd_ext_handler); 633 dasd_diag_discipline_pointer = &dasd_diag_discipline; 634 return 0; 635 } 636 637 static void __exit 638 dasd_diag_cleanup(void) 639 { 640 unregister_external_interrupt(0x2603, dasd_ext_handler); 641 ctl_clear_bit(0, 9); 642 dasd_diag_discipline_pointer = NULL; 643 } 644 645 module_init(dasd_diag_init); 646 module_exit(dasd_diag_cleanup); 647