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 dia250(void *iob, int cmd) 67 { 68 register unsigned long reg0 asm ("0") = (unsigned long) iob; 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 rc = 3; 76 asm volatile( 77 " diag 0,%2,0x250\n" 78 "0: ipm %0\n" 79 " srl %0,28\n" 80 " or %0,1\n" 81 "1:\n" 82 EX_TABLE(0b,1b) 83 : "+d" (rc), "=m" (*(addr_type *) iob) 84 : "d" (cmd), "d" (reg0), "m" (*(addr_type *) iob) 85 : "1", "cc"); 86 return rc; 87 } 88 89 /* Initialize block I/O to DIAG device using the specified blocksize and 90 * block offset. On success, return zero and set end_block to contain the 91 * number of blocks on the device minus the specified offset. Return non-zero 92 * otherwise. */ 93 static __inline__ int 94 mdsk_init_io(struct dasd_device *device, unsigned int blocksize, 95 blocknum_t offset, blocknum_t *end_block) 96 { 97 struct dasd_diag_private *private; 98 struct dasd_diag_init_io *iib; 99 int rc; 100 101 private = (struct dasd_diag_private *) device->private; 102 iib = &private->iib; 103 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 104 105 iib->dev_nr = _ccw_device_get_device_number(device->cdev); 106 iib->block_size = blocksize; 107 iib->offset = offset; 108 iib->flaga = DASD_DIAG_FLAGA_DEFAULT; 109 110 rc = dia250(iib, INIT_BIO); 111 112 if ((rc & 3) == 0 && end_block) 113 *end_block = iib->end_block; 114 115 return rc; 116 } 117 118 /* Remove block I/O environment for device. Return zero on success, non-zero 119 * otherwise. */ 120 static __inline__ int 121 mdsk_term_io(struct dasd_device * device) 122 { 123 struct dasd_diag_private *private; 124 struct dasd_diag_init_io *iib; 125 int rc; 126 127 private = (struct dasd_diag_private *) device->private; 128 iib = &private->iib; 129 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 130 iib->dev_nr = _ccw_device_get_device_number(device->cdev); 131 rc = dia250(iib, TERM_BIO); 132 return rc; 133 } 134 135 /* Error recovery for failed DIAG requests - try to reestablish the DIAG 136 * environment. */ 137 static void 138 dasd_diag_erp(struct dasd_device *device) 139 { 140 int rc; 141 142 mdsk_term_io(device); 143 rc = mdsk_init_io(device, device->bp_block, 0, NULL); 144 if (rc) 145 DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, " 146 "rc=%d", rc); 147 } 148 149 /* Start a given request at the device. Return zero on success, non-zero 150 * otherwise. */ 151 static int 152 dasd_start_diag(struct dasd_ccw_req * cqr) 153 { 154 struct dasd_device *device; 155 struct dasd_diag_private *private; 156 struct dasd_diag_req *dreq; 157 int rc; 158 159 device = cqr->device; 160 if (cqr->retries < 0) { 161 DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p " 162 "- no retry left)", cqr); 163 cqr->status = DASD_CQR_FAILED; 164 return -EIO; 165 } 166 private = (struct dasd_diag_private *) device->private; 167 dreq = (struct dasd_diag_req *) cqr->data; 168 169 private->iob.dev_nr = _ccw_device_get_device_number(device->cdev); 170 private->iob.key = 0; 171 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; 172 private->iob.block_count = dreq->block_count; 173 private->iob.interrupt_params = (addr_t) cqr; 174 private->iob.bio_list = dreq->bio; 175 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 176 177 cqr->startclk = get_clock(); 178 cqr->starttime = jiffies; 179 cqr->retries--; 180 181 rc = dia250(&private->iob, RW_BIO); 182 switch (rc) { 183 case 0: /* Synchronous I/O finished successfully */ 184 cqr->stopclk = get_clock(); 185 cqr->status = DASD_CQR_DONE; 186 /* Indicate to calling function that only a dasd_schedule_bh() 187 and no timer is needed */ 188 rc = -EACCES; 189 break; 190 case 8: /* Asynchronous I/O was started */ 191 cqr->status = DASD_CQR_IN_IO; 192 rc = 0; 193 break; 194 default: /* Error condition */ 195 cqr->status = DASD_CQR_QUEUED; 196 DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc); 197 dasd_diag_erp(device); 198 rc = -EIO; 199 break; 200 } 201 return rc; 202 } 203 204 /* Terminate given request at the device. */ 205 static int 206 dasd_diag_term_IO(struct dasd_ccw_req * cqr) 207 { 208 struct dasd_device *device; 209 210 device = cqr->device; 211 mdsk_term_io(device); 212 mdsk_init_io(device, device->bp_block, 0, NULL); 213 cqr->status = DASD_CQR_CLEAR; 214 cqr->stopclk = get_clock(); 215 dasd_schedule_bh(device); 216 return 0; 217 } 218 219 /* Handle external interruption. */ 220 static void 221 dasd_ext_handler(__u16 code) 222 { 223 struct dasd_ccw_req *cqr, *next; 224 struct dasd_device *device; 225 unsigned long long expires; 226 unsigned long flags; 227 u8 int_code, status; 228 addr_t ip; 229 int rc; 230 231 int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); 232 status = *((u8 *) DASD_DIAG_LC_INT_STATUS); 233 switch (int_code) { 234 case DASD_DIAG_CODE_31BIT: 235 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); 236 break; 237 case DASD_DIAG_CODE_64BIT: 238 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); 239 break; 240 default: 241 return; 242 } 243 if (!ip) { /* no intparm: unsolicited interrupt */ 244 MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt"); 245 return; 246 } 247 cqr = (struct dasd_ccw_req *) ip; 248 device = (struct dasd_device *) cqr->device; 249 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 250 DEV_MESSAGE(KERN_WARNING, device, 251 " magic number of dasd_ccw_req 0x%08X doesn't" 252 " match discipline 0x%08X", 253 cqr->magic, *(int *) (&device->discipline->name)); 254 return; 255 } 256 257 /* get irq lock to modify request queue */ 258 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 259 260 /* Check for a pending clear operation */ 261 if (cqr->status == DASD_CQR_CLEAR) { 262 cqr->status = DASD_CQR_QUEUED; 263 dasd_clear_timer(device); 264 dasd_schedule_bh(device); 265 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 266 return; 267 } 268 269 cqr->stopclk = get_clock(); 270 271 expires = 0; 272 if (status == 0) { 273 cqr->status = DASD_CQR_DONE; 274 /* Start first request on queue if possible -> fast_io. */ 275 if (!list_empty(&device->ccw_queue)) { 276 next = list_entry(device->ccw_queue.next, 277 struct dasd_ccw_req, list); 278 if (next->status == DASD_CQR_QUEUED) { 279 rc = dasd_start_diag(next); 280 if (rc == 0) 281 expires = next->expires; 282 else if (rc != -EACCES) 283 DEV_MESSAGE(KERN_WARNING, device, "%s", 284 "Interrupt fastpath " 285 "failed!"); 286 } 287 } 288 } else { 289 cqr->status = DASD_CQR_QUEUED; 290 DEV_MESSAGE(KERN_WARNING, device, "interrupt status for " 291 "request %p was %d (%d retries left)", cqr, status, 292 cqr->retries); 293 dasd_diag_erp(device); 294 } 295 296 if (expires != 0) 297 dasd_set_timer(device, expires); 298 else 299 dasd_clear_timer(device); 300 dasd_schedule_bh(device); 301 302 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 303 } 304 305 /* Check whether device can be controlled by DIAG discipline. Return zero on 306 * success, non-zero otherwise. */ 307 static int 308 dasd_diag_check_device(struct dasd_device *device) 309 { 310 struct dasd_diag_private *private; 311 struct dasd_diag_characteristics *rdc_data; 312 struct dasd_diag_bio bio; 313 struct vtoc_cms_label *label; 314 blocknum_t end_block; 315 unsigned int sb, bsize; 316 int rc; 317 318 private = (struct dasd_diag_private *) device->private; 319 if (private == NULL) { 320 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); 321 if (private == NULL) { 322 DEV_MESSAGE(KERN_WARNING, device, "%s", 323 "memory allocation failed for private data"); 324 return -ENOMEM; 325 } 326 device->private = (void *) private; 327 } 328 /* Read Device Characteristics */ 329 rdc_data = (void *) &(private->rdc_data); 330 rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev); 331 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); 332 333 rc = diag210((struct diag210 *) rdc_data); 334 if (rc) { 335 DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device " 336 "information (rc=%d)", rc); 337 return -ENOTSUPP; 338 } 339 340 /* Figure out position of label block */ 341 switch (private->rdc_data.vdev_class) { 342 case DEV_CLASS_FBA: 343 private->pt_block = 1; 344 break; 345 case DEV_CLASS_ECKD: 346 private->pt_block = 2; 347 break; 348 default: 349 DEV_MESSAGE(KERN_WARNING, device, "unsupported device class " 350 "(class=%d)", private->rdc_data.vdev_class); 351 return -ENOTSUPP; 352 } 353 354 DBF_DEV_EVENT(DBF_INFO, device, 355 "%04X: %04X on real %04X/%02X", 356 rdc_data->dev_nr, 357 rdc_data->vdev_type, 358 rdc_data->rdev_type, rdc_data->rdev_model); 359 360 /* terminate all outstanding operations */ 361 mdsk_term_io(device); 362 363 /* figure out blocksize of device */ 364 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); 365 if (label == NULL) { 366 DEV_MESSAGE(KERN_WARNING, device, "%s", 367 "No memory to allocate initialization request"); 368 return -ENOMEM; 369 } 370 rc = 0; 371 end_block = 0; 372 /* try all sizes - needed for ECKD devices */ 373 for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { 374 mdsk_init_io(device, bsize, 0, &end_block); 375 memset(&bio, 0, sizeof (struct dasd_diag_bio)); 376 bio.type = MDSK_READ_REQ; 377 bio.block_number = private->pt_block + 1; 378 bio.buffer = label; 379 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); 380 private->iob.dev_nr = rdc_data->dev_nr; 381 private->iob.key = 0; 382 private->iob.flags = 0; /* do synchronous io */ 383 private->iob.block_count = 1; 384 private->iob.interrupt_params = 0; 385 private->iob.bio_list = &bio; 386 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 387 rc = dia250(&private->iob, RW_BIO); 388 if (rc == 3) { 389 DEV_MESSAGE(KERN_WARNING, device, "%s", 390 "DIAG call failed"); 391 rc = -EOPNOTSUPP; 392 goto out; 393 } 394 mdsk_term_io(device); 395 if (rc == 0) 396 break; 397 } 398 if (bsize > PAGE_SIZE) { 399 DEV_MESSAGE(KERN_WARNING, device, "device access failed " 400 "(rc=%d)", rc); 401 rc = -EIO; 402 goto out; 403 } 404 /* check for label block */ 405 if (memcmp(label->label_id, DASD_DIAG_CMS1, 406 sizeof(DASD_DIAG_CMS1)) == 0) { 407 /* get formatted blocksize from label block */ 408 bsize = (unsigned int) label->block_size; 409 device->blocks = (unsigned long) label->block_count; 410 } else 411 device->blocks = end_block; 412 device->bp_block = bsize; 413 device->s2b_shift = 0; /* bits to shift 512 to get a block */ 414 for (sb = 512; sb < bsize; sb = sb << 1) 415 device->s2b_shift++; 416 rc = mdsk_init_io(device, device->bp_block, 0, NULL); 417 if (rc) { 418 DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization " 419 "failed (rc=%d)", rc); 420 rc = -EIO; 421 } else { 422 DEV_MESSAGE(KERN_INFO, device, 423 "(%ld B/blk): %ldkB", 424 (unsigned long) device->bp_block, 425 (unsigned long) (device->blocks << 426 device->s2b_shift) >> 1); 427 } 428 out: 429 free_page((long) label); 430 return rc; 431 } 432 433 /* Fill in virtual disk geometry for device. Return zero on success, non-zero 434 * otherwise. */ 435 static int 436 dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo) 437 { 438 if (dasd_check_blocksize(device->bp_block) != 0) 439 return -EINVAL; 440 geo->cylinders = (device->blocks << device->s2b_shift) >> 10; 441 geo->heads = 16; 442 geo->sectors = 128 >> device->s2b_shift; 443 return 0; 444 } 445 446 static dasd_era_t 447 dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat) 448 { 449 return dasd_era_fatal; 450 } 451 452 static dasd_erp_fn_t 453 dasd_diag_erp_action(struct dasd_ccw_req * cqr) 454 { 455 return dasd_default_erp_action; 456 } 457 458 static dasd_erp_fn_t 459 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) 460 { 461 return dasd_default_erp_postaction; 462 } 463 464 /* Create DASD request from block device request. Return pointer to new 465 * request on success, ERR_PTR otherwise. */ 466 static struct dasd_ccw_req * 467 dasd_diag_build_cp(struct dasd_device * device, struct request *req) 468 { 469 struct dasd_ccw_req *cqr; 470 struct dasd_diag_req *dreq; 471 struct dasd_diag_bio *dbio; 472 struct bio *bio; 473 struct bio_vec *bv; 474 char *dst; 475 unsigned int count, datasize; 476 sector_t recid, first_rec, last_rec; 477 unsigned int blksize, off; 478 unsigned char rw_cmd; 479 int i; 480 481 if (rq_data_dir(req) == READ) 482 rw_cmd = MDSK_READ_REQ; 483 else if (rq_data_dir(req) == WRITE) 484 rw_cmd = MDSK_WRITE_REQ; 485 else 486 return ERR_PTR(-EINVAL); 487 blksize = device->bp_block; 488 /* Calculate record id of first and last block. */ 489 first_rec = req->sector >> device->s2b_shift; 490 last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift; 491 /* Check struct bio and count the number of blocks for the request. */ 492 count = 0; 493 rq_for_each_bio(bio, req) { 494 bio_for_each_segment(bv, bio, i) { 495 if (bv->bv_len & (blksize - 1)) 496 /* Fba can only do full blocks. */ 497 return ERR_PTR(-EINVAL); 498 count += bv->bv_len >> (device->s2b_shift + 9); 499 } 500 } 501 /* Paranoia. */ 502 if (count != last_rec - first_rec + 1) 503 return ERR_PTR(-EINVAL); 504 /* Build the request */ 505 datasize = sizeof(struct dasd_diag_req) + 506 count*sizeof(struct dasd_diag_bio); 507 cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, 508 datasize, device); 509 if (IS_ERR(cqr)) 510 return cqr; 511 512 dreq = (struct dasd_diag_req *) cqr->data; 513 dreq->block_count = count; 514 dbio = dreq->bio; 515 recid = first_rec; 516 rq_for_each_bio(bio, req) { 517 bio_for_each_segment(bv, bio, i) { 518 dst = page_address(bv->bv_page) + bv->bv_offset; 519 for (off = 0; off < bv->bv_len; off += blksize) { 520 memset(dbio, 0, sizeof (struct dasd_diag_bio)); 521 dbio->type = rw_cmd; 522 dbio->block_number = recid + 1; 523 dbio->buffer = dst; 524 dbio++; 525 dst += blksize; 526 recid++; 527 } 528 } 529 } 530 cqr->retries = DIAG_MAX_RETRIES; 531 cqr->buildclk = get_clock(); 532 if (req->cmd_flags & REQ_FAILFAST) 533 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 534 cqr->device = device; 535 cqr->expires = DIAG_TIMEOUT; 536 cqr->status = DASD_CQR_FILLED; 537 return cqr; 538 } 539 540 /* Release DASD request. Return non-zero if request was successful, zero 541 * otherwise. */ 542 static int 543 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) 544 { 545 int status; 546 547 status = cqr->status == DASD_CQR_DONE; 548 dasd_sfree_request(cqr, cqr->device); 549 return status; 550 } 551 552 /* Fill in IOCTL data for device. */ 553 static int 554 dasd_diag_fill_info(struct dasd_device * device, 555 struct dasd_information2_t * info) 556 { 557 struct dasd_diag_private *private; 558 559 private = (struct dasd_diag_private *) device->private; 560 info->label_block = (unsigned int) private->pt_block; 561 info->FBA_layout = 1; 562 info->format = DASD_FORMAT_LDL; 563 info->characteristics_size = sizeof (struct dasd_diag_characteristics); 564 memcpy(info->characteristics, 565 &((struct dasd_diag_private *) device->private)->rdc_data, 566 sizeof (struct dasd_diag_characteristics)); 567 info->confdata_size = 0; 568 return 0; 569 } 570 571 static void 572 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 573 struct irb *stat) 574 { 575 DEV_MESSAGE(KERN_ERR, device, "%s", 576 "dump sense not available for DIAG data"); 577 } 578 579 struct dasd_discipline dasd_diag_discipline = { 580 .owner = THIS_MODULE, 581 .name = "DIAG", 582 .ebcname = "DIAG", 583 .max_blocks = DIAG_MAX_BLOCKS, 584 .check_device = dasd_diag_check_device, 585 .fill_geometry = dasd_diag_fill_geometry, 586 .start_IO = dasd_start_diag, 587 .term_IO = dasd_diag_term_IO, 588 .examine_error = dasd_diag_examine_error, 589 .erp_action = dasd_diag_erp_action, 590 .erp_postaction = dasd_diag_erp_postaction, 591 .build_cp = dasd_diag_build_cp, 592 .free_cp = dasd_diag_free_cp, 593 .dump_sense = dasd_diag_dump_sense, 594 .fill_info = dasd_diag_fill_info, 595 }; 596 597 static int __init 598 dasd_diag_init(void) 599 { 600 if (!MACHINE_IS_VM) { 601 MESSAGE_LOG(KERN_INFO, 602 "Machine is not VM: %s " 603 "discipline not initializing", 604 dasd_diag_discipline.name); 605 return -ENODEV; 606 } 607 ASCEBC(dasd_diag_discipline.ebcname, 4); 608 609 ctl_set_bit(0, 9); 610 register_external_interrupt(0x2603, dasd_ext_handler); 611 dasd_diag_discipline_pointer = &dasd_diag_discipline; 612 return 0; 613 } 614 615 static void __exit 616 dasd_diag_cleanup(void) 617 { 618 unregister_external_interrupt(0x2603, dasd_ext_handler); 619 ctl_clear_bit(0, 9); 620 dasd_diag_discipline_pointer = NULL; 621 } 622 623 module_init(dasd_diag_init); 624 module_exit(dasd_diag_cleanup); 625