1 /* 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 3 * Horst Hummel <Horst.Hummel@de.ibm.com> 4 * Carsten Otte <Cotte@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Copyright IBM Corp. 1999, 2009 8 */ 9 10 #define KMSG_COMPONENT "dasd" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 13 #include <linux/kmod.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/ctype.h> 17 #include <linux/major.h> 18 #include <linux/slab.h> 19 #include <linux/hdreg.h> 20 #include <linux/async.h> 21 #include <linux/mutex.h> 22 #include <linux/debugfs.h> 23 #include <linux/seq_file.h> 24 #include <linux/vmalloc.h> 25 26 #include <asm/ccwdev.h> 27 #include <asm/ebcdic.h> 28 #include <asm/idals.h> 29 #include <asm/itcw.h> 30 #include <asm/diag.h> 31 32 /* This is ugly... */ 33 #define PRINTK_HEADER "dasd:" 34 35 #include "dasd_int.h" 36 /* 37 * SECTION: Constant definitions to be used within this file 38 */ 39 #define DASD_CHANQ_MAX_SIZE 4 40 41 #define DASD_DIAG_MOD "dasd_diag_mod" 42 43 /* 44 * SECTION: exported variables of dasd.c 45 */ 46 debug_info_t *dasd_debug_area; 47 EXPORT_SYMBOL(dasd_debug_area); 48 static struct dentry *dasd_debugfs_root_entry; 49 struct dasd_discipline *dasd_diag_discipline_pointer; 50 EXPORT_SYMBOL(dasd_diag_discipline_pointer); 51 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); 52 53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); 54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver," 55 " Copyright IBM Corp. 2000"); 56 MODULE_SUPPORTED_DEVICE("dasd"); 57 MODULE_LICENSE("GPL"); 58 59 /* 60 * SECTION: prototypes for static functions of dasd.c 61 */ 62 static int dasd_alloc_queue(struct dasd_block *); 63 static void dasd_setup_queue(struct dasd_block *); 64 static void dasd_free_queue(struct dasd_block *); 65 static void dasd_flush_request_queue(struct dasd_block *); 66 static int dasd_flush_block_queue(struct dasd_block *); 67 static void dasd_device_tasklet(struct dasd_device *); 68 static void dasd_block_tasklet(struct dasd_block *); 69 static void do_kick_device(struct work_struct *); 70 static void do_restore_device(struct work_struct *); 71 static void do_reload_device(struct work_struct *); 72 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); 73 static void dasd_device_timeout(unsigned long); 74 static void dasd_block_timeout(unsigned long); 75 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); 76 static void dasd_profile_init(struct dasd_profile *, struct dentry *); 77 static void dasd_profile_exit(struct dasd_profile *); 78 79 /* 80 * SECTION: Operations on the device structure. 81 */ 82 static wait_queue_head_t dasd_init_waitq; 83 static wait_queue_head_t dasd_flush_wq; 84 static wait_queue_head_t generic_waitq; 85 static wait_queue_head_t shutdown_waitq; 86 87 /* 88 * Allocate memory for a new device structure. 89 */ 90 struct dasd_device *dasd_alloc_device(void) 91 { 92 struct dasd_device *device; 93 94 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); 95 if (!device) 96 return ERR_PTR(-ENOMEM); 97 98 /* Get two pages for normal block device operations. */ 99 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); 100 if (!device->ccw_mem) { 101 kfree(device); 102 return ERR_PTR(-ENOMEM); 103 } 104 /* Get one page for error recovery. */ 105 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); 106 if (!device->erp_mem) { 107 free_pages((unsigned long) device->ccw_mem, 1); 108 kfree(device); 109 return ERR_PTR(-ENOMEM); 110 } 111 112 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); 113 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); 114 spin_lock_init(&device->mem_lock); 115 atomic_set(&device->tasklet_scheduled, 0); 116 tasklet_init(&device->tasklet, 117 (void (*)(unsigned long)) dasd_device_tasklet, 118 (unsigned long) device); 119 INIT_LIST_HEAD(&device->ccw_queue); 120 init_timer(&device->timer); 121 device->timer.function = dasd_device_timeout; 122 device->timer.data = (unsigned long) device; 123 INIT_WORK(&device->kick_work, do_kick_device); 124 INIT_WORK(&device->restore_device, do_restore_device); 125 INIT_WORK(&device->reload_device, do_reload_device); 126 device->state = DASD_STATE_NEW; 127 device->target = DASD_STATE_NEW; 128 mutex_init(&device->state_mutex); 129 spin_lock_init(&device->profile.lock); 130 return device; 131 } 132 133 /* 134 * Free memory of a device structure. 135 */ 136 void dasd_free_device(struct dasd_device *device) 137 { 138 kfree(device->private); 139 free_page((unsigned long) device->erp_mem); 140 free_pages((unsigned long) device->ccw_mem, 1); 141 kfree(device); 142 } 143 144 /* 145 * Allocate memory for a new device structure. 146 */ 147 struct dasd_block *dasd_alloc_block(void) 148 { 149 struct dasd_block *block; 150 151 block = kzalloc(sizeof(*block), GFP_ATOMIC); 152 if (!block) 153 return ERR_PTR(-ENOMEM); 154 /* open_count = 0 means device online but not in use */ 155 atomic_set(&block->open_count, -1); 156 157 spin_lock_init(&block->request_queue_lock); 158 atomic_set(&block->tasklet_scheduled, 0); 159 tasklet_init(&block->tasklet, 160 (void (*)(unsigned long)) dasd_block_tasklet, 161 (unsigned long) block); 162 INIT_LIST_HEAD(&block->ccw_queue); 163 spin_lock_init(&block->queue_lock); 164 init_timer(&block->timer); 165 block->timer.function = dasd_block_timeout; 166 block->timer.data = (unsigned long) block; 167 spin_lock_init(&block->profile.lock); 168 169 return block; 170 } 171 EXPORT_SYMBOL_GPL(dasd_alloc_block); 172 173 /* 174 * Free memory of a device structure. 175 */ 176 void dasd_free_block(struct dasd_block *block) 177 { 178 kfree(block); 179 } 180 EXPORT_SYMBOL_GPL(dasd_free_block); 181 182 /* 183 * Make a new device known to the system. 184 */ 185 static int dasd_state_new_to_known(struct dasd_device *device) 186 { 187 int rc; 188 189 /* 190 * As long as the device is not in state DASD_STATE_NEW we want to 191 * keep the reference count > 0. 192 */ 193 dasd_get_device(device); 194 195 if (device->block) { 196 rc = dasd_alloc_queue(device->block); 197 if (rc) { 198 dasd_put_device(device); 199 return rc; 200 } 201 } 202 device->state = DASD_STATE_KNOWN; 203 return 0; 204 } 205 206 /* 207 * Let the system forget about a device. 208 */ 209 static int dasd_state_known_to_new(struct dasd_device *device) 210 { 211 /* Disable extended error reporting for this device. */ 212 dasd_eer_disable(device); 213 /* Forget the discipline information. */ 214 if (device->discipline) { 215 if (device->discipline->uncheck_device) 216 device->discipline->uncheck_device(device); 217 module_put(device->discipline->owner); 218 } 219 device->discipline = NULL; 220 if (device->base_discipline) 221 module_put(device->base_discipline->owner); 222 device->base_discipline = NULL; 223 device->state = DASD_STATE_NEW; 224 225 if (device->block) 226 dasd_free_queue(device->block); 227 228 /* Give up reference we took in dasd_state_new_to_known. */ 229 dasd_put_device(device); 230 return 0; 231 } 232 233 static struct dentry *dasd_debugfs_setup(const char *name, 234 struct dentry *base_dentry) 235 { 236 struct dentry *pde; 237 238 if (!base_dentry) 239 return NULL; 240 pde = debugfs_create_dir(name, base_dentry); 241 if (!pde || IS_ERR(pde)) 242 return NULL; 243 return pde; 244 } 245 246 /* 247 * Request the irq line for the device. 248 */ 249 static int dasd_state_known_to_basic(struct dasd_device *device) 250 { 251 struct dasd_block *block = device->block; 252 int rc = 0; 253 254 /* Allocate and register gendisk structure. */ 255 if (block) { 256 rc = dasd_gendisk_alloc(block); 257 if (rc) 258 return rc; 259 block->debugfs_dentry = 260 dasd_debugfs_setup(block->gdp->disk_name, 261 dasd_debugfs_root_entry); 262 dasd_profile_init(&block->profile, block->debugfs_dentry); 263 if (dasd_global_profile_level == DASD_PROFILE_ON) 264 dasd_profile_on(&device->block->profile); 265 } 266 device->debugfs_dentry = 267 dasd_debugfs_setup(dev_name(&device->cdev->dev), 268 dasd_debugfs_root_entry); 269 dasd_profile_init(&device->profile, device->debugfs_dentry); 270 271 /* register 'device' debug area, used for all DBF_DEV_XXX calls */ 272 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, 273 8 * sizeof(long)); 274 debug_register_view(device->debug_area, &debug_sprintf_view); 275 debug_set_level(device->debug_area, DBF_WARNING); 276 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); 277 278 device->state = DASD_STATE_BASIC; 279 280 return rc; 281 } 282 283 /* 284 * Release the irq line for the device. Terminate any running i/o. 285 */ 286 static int dasd_state_basic_to_known(struct dasd_device *device) 287 { 288 int rc; 289 290 if (device->discipline->basic_to_known) { 291 rc = device->discipline->basic_to_known(device); 292 if (rc) 293 return rc; 294 } 295 296 if (device->block) { 297 dasd_profile_exit(&device->block->profile); 298 debugfs_remove(device->block->debugfs_dentry); 299 dasd_gendisk_free(device->block); 300 dasd_block_clear_timer(device->block); 301 } 302 rc = dasd_flush_device_queue(device); 303 if (rc) 304 return rc; 305 dasd_device_clear_timer(device); 306 dasd_profile_exit(&device->profile); 307 debugfs_remove(device->debugfs_dentry); 308 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); 309 if (device->debug_area != NULL) { 310 debug_unregister(device->debug_area); 311 device->debug_area = NULL; 312 } 313 device->state = DASD_STATE_KNOWN; 314 return 0; 315 } 316 317 /* 318 * Do the initial analysis. The do_analysis function may return 319 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC 320 * until the discipline decides to continue the startup sequence 321 * by calling the function dasd_change_state. The eckd disciplines 322 * uses this to start a ccw that detects the format. The completion 323 * interrupt for this detection ccw uses the kernel event daemon to 324 * trigger the call to dasd_change_state. All this is done in the 325 * discipline code, see dasd_eckd.c. 326 * After the analysis ccw is done (do_analysis returned 0) the block 327 * device is setup. 328 * In case the analysis returns an error, the device setup is stopped 329 * (a fake disk was already added to allow formatting). 330 */ 331 static int dasd_state_basic_to_ready(struct dasd_device *device) 332 { 333 int rc; 334 struct dasd_block *block; 335 336 rc = 0; 337 block = device->block; 338 /* make disk known with correct capacity */ 339 if (block) { 340 if (block->base->discipline->do_analysis != NULL) 341 rc = block->base->discipline->do_analysis(block); 342 if (rc) { 343 if (rc != -EAGAIN) { 344 device->state = DASD_STATE_UNFMT; 345 goto out; 346 } 347 return rc; 348 } 349 dasd_setup_queue(block); 350 set_capacity(block->gdp, 351 block->blocks << block->s2b_shift); 352 device->state = DASD_STATE_READY; 353 rc = dasd_scan_partitions(block); 354 if (rc) { 355 device->state = DASD_STATE_BASIC; 356 return rc; 357 } 358 } else { 359 device->state = DASD_STATE_READY; 360 } 361 out: 362 if (device->discipline->basic_to_ready) 363 rc = device->discipline->basic_to_ready(device); 364 return rc; 365 } 366 367 static inline 368 int _wait_for_empty_queues(struct dasd_device *device) 369 { 370 if (device->block) 371 return list_empty(&device->ccw_queue) && 372 list_empty(&device->block->ccw_queue); 373 else 374 return list_empty(&device->ccw_queue); 375 } 376 377 /* 378 * Remove device from block device layer. Destroy dirty buffers. 379 * Forget format information. Check if the target level is basic 380 * and if it is create fake disk for formatting. 381 */ 382 static int dasd_state_ready_to_basic(struct dasd_device *device) 383 { 384 int rc; 385 386 device->state = DASD_STATE_BASIC; 387 if (device->block) { 388 struct dasd_block *block = device->block; 389 rc = dasd_flush_block_queue(block); 390 if (rc) { 391 device->state = DASD_STATE_READY; 392 return rc; 393 } 394 dasd_flush_request_queue(block); 395 dasd_destroy_partitions(block); 396 block->blocks = 0; 397 block->bp_block = 0; 398 block->s2b_shift = 0; 399 } 400 return 0; 401 } 402 403 /* 404 * Back to basic. 405 */ 406 static int dasd_state_unfmt_to_basic(struct dasd_device *device) 407 { 408 device->state = DASD_STATE_BASIC; 409 return 0; 410 } 411 412 /* 413 * Make the device online and schedule the bottom half to start 414 * the requeueing of requests from the linux request queue to the 415 * ccw queue. 416 */ 417 static int 418 dasd_state_ready_to_online(struct dasd_device * device) 419 { 420 struct gendisk *disk; 421 struct disk_part_iter piter; 422 struct hd_struct *part; 423 424 device->state = DASD_STATE_ONLINE; 425 if (device->block) { 426 dasd_schedule_block_bh(device->block); 427 if ((device->features & DASD_FEATURE_USERAW)) { 428 disk = device->block->gdp; 429 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); 430 return 0; 431 } 432 disk = device->block->bdev->bd_disk; 433 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 434 while ((part = disk_part_iter_next(&piter))) 435 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 436 disk_part_iter_exit(&piter); 437 } 438 return 0; 439 } 440 441 /* 442 * Stop the requeueing of requests again. 443 */ 444 static int dasd_state_online_to_ready(struct dasd_device *device) 445 { 446 int rc; 447 struct gendisk *disk; 448 struct disk_part_iter piter; 449 struct hd_struct *part; 450 451 if (device->discipline->online_to_ready) { 452 rc = device->discipline->online_to_ready(device); 453 if (rc) 454 return rc; 455 } 456 457 device->state = DASD_STATE_READY; 458 if (device->block && !(device->features & DASD_FEATURE_USERAW)) { 459 disk = device->block->bdev->bd_disk; 460 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 461 while ((part = disk_part_iter_next(&piter))) 462 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 463 disk_part_iter_exit(&piter); 464 } 465 return 0; 466 } 467 468 /* 469 * Device startup state changes. 470 */ 471 static int dasd_increase_state(struct dasd_device *device) 472 { 473 int rc; 474 475 rc = 0; 476 if (device->state == DASD_STATE_NEW && 477 device->target >= DASD_STATE_KNOWN) 478 rc = dasd_state_new_to_known(device); 479 480 if (!rc && 481 device->state == DASD_STATE_KNOWN && 482 device->target >= DASD_STATE_BASIC) 483 rc = dasd_state_known_to_basic(device); 484 485 if (!rc && 486 device->state == DASD_STATE_BASIC && 487 device->target >= DASD_STATE_READY) 488 rc = dasd_state_basic_to_ready(device); 489 490 if (!rc && 491 device->state == DASD_STATE_UNFMT && 492 device->target > DASD_STATE_UNFMT) 493 rc = -EPERM; 494 495 if (!rc && 496 device->state == DASD_STATE_READY && 497 device->target >= DASD_STATE_ONLINE) 498 rc = dasd_state_ready_to_online(device); 499 500 return rc; 501 } 502 503 /* 504 * Device shutdown state changes. 505 */ 506 static int dasd_decrease_state(struct dasd_device *device) 507 { 508 int rc; 509 510 rc = 0; 511 if (device->state == DASD_STATE_ONLINE && 512 device->target <= DASD_STATE_READY) 513 rc = dasd_state_online_to_ready(device); 514 515 if (!rc && 516 device->state == DASD_STATE_READY && 517 device->target <= DASD_STATE_BASIC) 518 rc = dasd_state_ready_to_basic(device); 519 520 if (!rc && 521 device->state == DASD_STATE_UNFMT && 522 device->target <= DASD_STATE_BASIC) 523 rc = dasd_state_unfmt_to_basic(device); 524 525 if (!rc && 526 device->state == DASD_STATE_BASIC && 527 device->target <= DASD_STATE_KNOWN) 528 rc = dasd_state_basic_to_known(device); 529 530 if (!rc && 531 device->state == DASD_STATE_KNOWN && 532 device->target <= DASD_STATE_NEW) 533 rc = dasd_state_known_to_new(device); 534 535 return rc; 536 } 537 538 /* 539 * This is the main startup/shutdown routine. 540 */ 541 static void dasd_change_state(struct dasd_device *device) 542 { 543 int rc; 544 545 if (device->state == device->target) 546 /* Already where we want to go today... */ 547 return; 548 if (device->state < device->target) 549 rc = dasd_increase_state(device); 550 else 551 rc = dasd_decrease_state(device); 552 if (rc == -EAGAIN) 553 return; 554 if (rc) 555 device->target = device->state; 556 557 /* let user-space know that the device status changed */ 558 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); 559 560 if (device->state == device->target) 561 wake_up(&dasd_init_waitq); 562 } 563 564 /* 565 * Kick starter for devices that did not complete the startup/shutdown 566 * procedure or were sleeping because of a pending state. 567 * dasd_kick_device will schedule a call do do_kick_device to the kernel 568 * event daemon. 569 */ 570 static void do_kick_device(struct work_struct *work) 571 { 572 struct dasd_device *device = container_of(work, struct dasd_device, kick_work); 573 mutex_lock(&device->state_mutex); 574 dasd_change_state(device); 575 mutex_unlock(&device->state_mutex); 576 dasd_schedule_device_bh(device); 577 dasd_put_device(device); 578 } 579 580 void dasd_kick_device(struct dasd_device *device) 581 { 582 dasd_get_device(device); 583 /* queue call to dasd_kick_device to the kernel event daemon. */ 584 if (!schedule_work(&device->kick_work)) 585 dasd_put_device(device); 586 } 587 EXPORT_SYMBOL(dasd_kick_device); 588 589 /* 590 * dasd_reload_device will schedule a call do do_reload_device to the kernel 591 * event daemon. 592 */ 593 static void do_reload_device(struct work_struct *work) 594 { 595 struct dasd_device *device = container_of(work, struct dasd_device, 596 reload_device); 597 device->discipline->reload(device); 598 dasd_put_device(device); 599 } 600 601 void dasd_reload_device(struct dasd_device *device) 602 { 603 dasd_get_device(device); 604 /* queue call to dasd_reload_device to the kernel event daemon. */ 605 if (!schedule_work(&device->reload_device)) 606 dasd_put_device(device); 607 } 608 EXPORT_SYMBOL(dasd_reload_device); 609 610 /* 611 * dasd_restore_device will schedule a call do do_restore_device to the kernel 612 * event daemon. 613 */ 614 static void do_restore_device(struct work_struct *work) 615 { 616 struct dasd_device *device = container_of(work, struct dasd_device, 617 restore_device); 618 device->cdev->drv->restore(device->cdev); 619 dasd_put_device(device); 620 } 621 622 void dasd_restore_device(struct dasd_device *device) 623 { 624 dasd_get_device(device); 625 /* queue call to dasd_restore_device to the kernel event daemon. */ 626 if (!schedule_work(&device->restore_device)) 627 dasd_put_device(device); 628 } 629 630 /* 631 * Set the target state for a device and starts the state change. 632 */ 633 void dasd_set_target_state(struct dasd_device *device, int target) 634 { 635 dasd_get_device(device); 636 mutex_lock(&device->state_mutex); 637 /* If we are in probeonly mode stop at DASD_STATE_READY. */ 638 if (dasd_probeonly && target > DASD_STATE_READY) 639 target = DASD_STATE_READY; 640 if (device->target != target) { 641 if (device->state == target) 642 wake_up(&dasd_init_waitq); 643 device->target = target; 644 } 645 if (device->state != device->target) 646 dasd_change_state(device); 647 mutex_unlock(&device->state_mutex); 648 dasd_put_device(device); 649 } 650 EXPORT_SYMBOL(dasd_set_target_state); 651 652 /* 653 * Enable devices with device numbers in [from..to]. 654 */ 655 static inline int _wait_for_device(struct dasd_device *device) 656 { 657 return (device->state == device->target); 658 } 659 660 void dasd_enable_device(struct dasd_device *device) 661 { 662 dasd_set_target_state(device, DASD_STATE_ONLINE); 663 if (device->state <= DASD_STATE_KNOWN) 664 /* No discipline for device found. */ 665 dasd_set_target_state(device, DASD_STATE_NEW); 666 /* Now wait for the devices to come up. */ 667 wait_event(dasd_init_waitq, _wait_for_device(device)); 668 669 dasd_reload_device(device); 670 if (device->discipline->kick_validate) 671 device->discipline->kick_validate(device); 672 } 673 EXPORT_SYMBOL(dasd_enable_device); 674 675 /* 676 * SECTION: device operation (interrupt handler, start i/o, term i/o ...) 677 */ 678 679 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; 680 681 #ifdef CONFIG_DASD_PROFILE 682 struct dasd_profile dasd_global_profile = { 683 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), 684 }; 685 static struct dentry *dasd_debugfs_global_entry; 686 687 /* 688 * Add profiling information for cqr before execution. 689 */ 690 static void dasd_profile_start(struct dasd_block *block, 691 struct dasd_ccw_req *cqr, 692 struct request *req) 693 { 694 struct list_head *l; 695 unsigned int counter; 696 struct dasd_device *device; 697 698 /* count the length of the chanq for statistics */ 699 counter = 0; 700 if (dasd_global_profile_level || block->profile.data) 701 list_for_each(l, &block->ccw_queue) 702 if (++counter >= 31) 703 break; 704 705 spin_lock(&dasd_global_profile.lock); 706 if (dasd_global_profile.data) { 707 dasd_global_profile.data->dasd_io_nr_req[counter]++; 708 if (rq_data_dir(req) == READ) 709 dasd_global_profile.data->dasd_read_nr_req[counter]++; 710 } 711 spin_unlock(&dasd_global_profile.lock); 712 713 spin_lock(&block->profile.lock); 714 if (block->profile.data) { 715 block->profile.data->dasd_io_nr_req[counter]++; 716 if (rq_data_dir(req) == READ) 717 block->profile.data->dasd_read_nr_req[counter]++; 718 } 719 spin_unlock(&block->profile.lock); 720 721 /* 722 * We count the request for the start device, even though it may run on 723 * some other device due to error recovery. This way we make sure that 724 * we count each request only once. 725 */ 726 device = cqr->startdev; 727 if (device->profile.data) { 728 counter = 1; /* request is not yet queued on the start device */ 729 list_for_each(l, &device->ccw_queue) 730 if (++counter >= 31) 731 break; 732 } 733 spin_lock(&device->profile.lock); 734 if (device->profile.data) { 735 device->profile.data->dasd_io_nr_req[counter]++; 736 if (rq_data_dir(req) == READ) 737 device->profile.data->dasd_read_nr_req[counter]++; 738 } 739 spin_unlock(&device->profile.lock); 740 } 741 742 /* 743 * Add profiling information for cqr after execution. 744 */ 745 746 #define dasd_profile_counter(value, index) \ 747 { \ 748 for (index = 0; index < 31 && value >> (2+index); index++) \ 749 ; \ 750 } 751 752 static void dasd_profile_end_add_data(struct dasd_profile_info *data, 753 int is_alias, 754 int is_tpm, 755 int is_read, 756 long sectors, 757 int sectors_ind, 758 int tottime_ind, 759 int tottimeps_ind, 760 int strtime_ind, 761 int irqtime_ind, 762 int irqtimeps_ind, 763 int endtime_ind) 764 { 765 /* in case of an overflow, reset the whole profile */ 766 if (data->dasd_io_reqs == UINT_MAX) { 767 memset(data, 0, sizeof(*data)); 768 getnstimeofday(&data->starttod); 769 } 770 data->dasd_io_reqs++; 771 data->dasd_io_sects += sectors; 772 if (is_alias) 773 data->dasd_io_alias++; 774 if (is_tpm) 775 data->dasd_io_tpm++; 776 777 data->dasd_io_secs[sectors_ind]++; 778 data->dasd_io_times[tottime_ind]++; 779 data->dasd_io_timps[tottimeps_ind]++; 780 data->dasd_io_time1[strtime_ind]++; 781 data->dasd_io_time2[irqtime_ind]++; 782 data->dasd_io_time2ps[irqtimeps_ind]++; 783 data->dasd_io_time3[endtime_ind]++; 784 785 if (is_read) { 786 data->dasd_read_reqs++; 787 data->dasd_read_sects += sectors; 788 if (is_alias) 789 data->dasd_read_alias++; 790 if (is_tpm) 791 data->dasd_read_tpm++; 792 data->dasd_read_secs[sectors_ind]++; 793 data->dasd_read_times[tottime_ind]++; 794 data->dasd_read_time1[strtime_ind]++; 795 data->dasd_read_time2[irqtime_ind]++; 796 data->dasd_read_time3[endtime_ind]++; 797 } 798 } 799 800 static void dasd_profile_end(struct dasd_block *block, 801 struct dasd_ccw_req *cqr, 802 struct request *req) 803 { 804 long strtime, irqtime, endtime, tottime; /* in microseconds */ 805 long tottimeps, sectors; 806 struct dasd_device *device; 807 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; 808 int irqtime_ind, irqtimeps_ind, endtime_ind; 809 810 device = cqr->startdev; 811 if (!(dasd_global_profile_level || 812 block->profile.data || 813 device->profile.data)) 814 return; 815 816 sectors = blk_rq_sectors(req); 817 if (!cqr->buildclk || !cqr->startclk || 818 !cqr->stopclk || !cqr->endclk || 819 !sectors) 820 return; 821 822 strtime = ((cqr->startclk - cqr->buildclk) >> 12); 823 irqtime = ((cqr->stopclk - cqr->startclk) >> 12); 824 endtime = ((cqr->endclk - cqr->stopclk) >> 12); 825 tottime = ((cqr->endclk - cqr->buildclk) >> 12); 826 tottimeps = tottime / sectors; 827 828 dasd_profile_counter(sectors, sectors_ind); 829 dasd_profile_counter(tottime, tottime_ind); 830 dasd_profile_counter(tottimeps, tottimeps_ind); 831 dasd_profile_counter(strtime, strtime_ind); 832 dasd_profile_counter(irqtime, irqtime_ind); 833 dasd_profile_counter(irqtime / sectors, irqtimeps_ind); 834 dasd_profile_counter(endtime, endtime_ind); 835 836 spin_lock(&dasd_global_profile.lock); 837 if (dasd_global_profile.data) { 838 dasd_profile_end_add_data(dasd_global_profile.data, 839 cqr->startdev != block->base, 840 cqr->cpmode == 1, 841 rq_data_dir(req) == READ, 842 sectors, sectors_ind, tottime_ind, 843 tottimeps_ind, strtime_ind, 844 irqtime_ind, irqtimeps_ind, 845 endtime_ind); 846 } 847 spin_unlock(&dasd_global_profile.lock); 848 849 spin_lock(&block->profile.lock); 850 if (block->profile.data) 851 dasd_profile_end_add_data(block->profile.data, 852 cqr->startdev != block->base, 853 cqr->cpmode == 1, 854 rq_data_dir(req) == READ, 855 sectors, sectors_ind, tottime_ind, 856 tottimeps_ind, strtime_ind, 857 irqtime_ind, irqtimeps_ind, 858 endtime_ind); 859 spin_unlock(&block->profile.lock); 860 861 spin_lock(&device->profile.lock); 862 if (device->profile.data) 863 dasd_profile_end_add_data(device->profile.data, 864 cqr->startdev != block->base, 865 cqr->cpmode == 1, 866 rq_data_dir(req) == READ, 867 sectors, sectors_ind, tottime_ind, 868 tottimeps_ind, strtime_ind, 869 irqtime_ind, irqtimeps_ind, 870 endtime_ind); 871 spin_unlock(&device->profile.lock); 872 } 873 874 void dasd_profile_reset(struct dasd_profile *profile) 875 { 876 struct dasd_profile_info *data; 877 878 spin_lock_bh(&profile->lock); 879 data = profile->data; 880 if (!data) { 881 spin_unlock_bh(&profile->lock); 882 return; 883 } 884 memset(data, 0, sizeof(*data)); 885 getnstimeofday(&data->starttod); 886 spin_unlock_bh(&profile->lock); 887 } 888 889 int dasd_profile_on(struct dasd_profile *profile) 890 { 891 struct dasd_profile_info *data; 892 893 data = kzalloc(sizeof(*data), GFP_KERNEL); 894 if (!data) 895 return -ENOMEM; 896 spin_lock_bh(&profile->lock); 897 if (profile->data) { 898 spin_unlock_bh(&profile->lock); 899 kfree(data); 900 return 0; 901 } 902 getnstimeofday(&data->starttod); 903 profile->data = data; 904 spin_unlock_bh(&profile->lock); 905 return 0; 906 } 907 908 void dasd_profile_off(struct dasd_profile *profile) 909 { 910 spin_lock_bh(&profile->lock); 911 kfree(profile->data); 912 profile->data = NULL; 913 spin_unlock_bh(&profile->lock); 914 } 915 916 char *dasd_get_user_string(const char __user *user_buf, size_t user_len) 917 { 918 char *buffer; 919 920 buffer = vmalloc(user_len + 1); 921 if (buffer == NULL) 922 return ERR_PTR(-ENOMEM); 923 if (copy_from_user(buffer, user_buf, user_len) != 0) { 924 vfree(buffer); 925 return ERR_PTR(-EFAULT); 926 } 927 /* got the string, now strip linefeed. */ 928 if (buffer[user_len - 1] == '\n') 929 buffer[user_len - 1] = 0; 930 else 931 buffer[user_len] = 0; 932 return buffer; 933 } 934 935 static ssize_t dasd_stats_write(struct file *file, 936 const char __user *user_buf, 937 size_t user_len, loff_t *pos) 938 { 939 char *buffer, *str; 940 int rc; 941 struct seq_file *m = (struct seq_file *)file->private_data; 942 struct dasd_profile *prof = m->private; 943 944 if (user_len > 65536) 945 user_len = 65536; 946 buffer = dasd_get_user_string(user_buf, user_len); 947 if (IS_ERR(buffer)) 948 return PTR_ERR(buffer); 949 950 str = skip_spaces(buffer); 951 rc = user_len; 952 if (strncmp(str, "reset", 5) == 0) { 953 dasd_profile_reset(prof); 954 } else if (strncmp(str, "on", 2) == 0) { 955 rc = dasd_profile_on(prof); 956 if (rc) 957 goto out; 958 rc = user_len; 959 if (prof == &dasd_global_profile) { 960 dasd_profile_reset(prof); 961 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; 962 } 963 } else if (strncmp(str, "off", 3) == 0) { 964 if (prof == &dasd_global_profile) 965 dasd_global_profile_level = DASD_PROFILE_OFF; 966 dasd_profile_off(prof); 967 } else 968 rc = -EINVAL; 969 out: 970 vfree(buffer); 971 return rc; 972 } 973 974 static void dasd_stats_array(struct seq_file *m, unsigned int *array) 975 { 976 int i; 977 978 for (i = 0; i < 32; i++) 979 seq_printf(m, "%u ", array[i]); 980 seq_putc(m, '\n'); 981 } 982 983 static void dasd_stats_seq_print(struct seq_file *m, 984 struct dasd_profile_info *data) 985 { 986 seq_printf(m, "start_time %ld.%09ld\n", 987 data->starttod.tv_sec, data->starttod.tv_nsec); 988 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); 989 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); 990 seq_printf(m, "total_pav %u\n", data->dasd_io_alias); 991 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); 992 seq_puts(m, "histogram_sectors "); 993 dasd_stats_array(m, data->dasd_io_secs); 994 seq_puts(m, "histogram_io_times "); 995 dasd_stats_array(m, data->dasd_io_times); 996 seq_puts(m, "histogram_io_times_weighted "); 997 dasd_stats_array(m, data->dasd_io_timps); 998 seq_puts(m, "histogram_time_build_to_ssch "); 999 dasd_stats_array(m, data->dasd_io_time1); 1000 seq_puts(m, "histogram_time_ssch_to_irq "); 1001 dasd_stats_array(m, data->dasd_io_time2); 1002 seq_puts(m, "histogram_time_ssch_to_irq_weighted "); 1003 dasd_stats_array(m, data->dasd_io_time2ps); 1004 seq_puts(m, "histogram_time_irq_to_end "); 1005 dasd_stats_array(m, data->dasd_io_time3); 1006 seq_puts(m, "histogram_ccw_queue_length "); 1007 dasd_stats_array(m, data->dasd_io_nr_req); 1008 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); 1009 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); 1010 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); 1011 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); 1012 seq_puts(m, "histogram_read_sectors "); 1013 dasd_stats_array(m, data->dasd_read_secs); 1014 seq_puts(m, "histogram_read_times "); 1015 dasd_stats_array(m, data->dasd_read_times); 1016 seq_puts(m, "histogram_read_time_build_to_ssch "); 1017 dasd_stats_array(m, data->dasd_read_time1); 1018 seq_puts(m, "histogram_read_time_ssch_to_irq "); 1019 dasd_stats_array(m, data->dasd_read_time2); 1020 seq_puts(m, "histogram_read_time_irq_to_end "); 1021 dasd_stats_array(m, data->dasd_read_time3); 1022 seq_puts(m, "histogram_read_ccw_queue_length "); 1023 dasd_stats_array(m, data->dasd_read_nr_req); 1024 } 1025 1026 static int dasd_stats_show(struct seq_file *m, void *v) 1027 { 1028 struct dasd_profile *profile; 1029 struct dasd_profile_info *data; 1030 1031 profile = m->private; 1032 spin_lock_bh(&profile->lock); 1033 data = profile->data; 1034 if (!data) { 1035 spin_unlock_bh(&profile->lock); 1036 seq_puts(m, "disabled\n"); 1037 return 0; 1038 } 1039 dasd_stats_seq_print(m, data); 1040 spin_unlock_bh(&profile->lock); 1041 return 0; 1042 } 1043 1044 static int dasd_stats_open(struct inode *inode, struct file *file) 1045 { 1046 struct dasd_profile *profile = inode->i_private; 1047 return single_open(file, dasd_stats_show, profile); 1048 } 1049 1050 static const struct file_operations dasd_stats_raw_fops = { 1051 .owner = THIS_MODULE, 1052 .open = dasd_stats_open, 1053 .read = seq_read, 1054 .llseek = seq_lseek, 1055 .release = single_release, 1056 .write = dasd_stats_write, 1057 }; 1058 1059 static void dasd_profile_init(struct dasd_profile *profile, 1060 struct dentry *base_dentry) 1061 { 1062 umode_t mode; 1063 struct dentry *pde; 1064 1065 if (!base_dentry) 1066 return; 1067 profile->dentry = NULL; 1068 profile->data = NULL; 1069 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1070 pde = debugfs_create_file("statistics", mode, base_dentry, 1071 profile, &dasd_stats_raw_fops); 1072 if (pde && !IS_ERR(pde)) 1073 profile->dentry = pde; 1074 return; 1075 } 1076 1077 static void dasd_profile_exit(struct dasd_profile *profile) 1078 { 1079 dasd_profile_off(profile); 1080 debugfs_remove(profile->dentry); 1081 profile->dentry = NULL; 1082 } 1083 1084 static void dasd_statistics_removeroot(void) 1085 { 1086 dasd_global_profile_level = DASD_PROFILE_OFF; 1087 dasd_profile_exit(&dasd_global_profile); 1088 debugfs_remove(dasd_debugfs_global_entry); 1089 debugfs_remove(dasd_debugfs_root_entry); 1090 } 1091 1092 static void dasd_statistics_createroot(void) 1093 { 1094 struct dentry *pde; 1095 1096 dasd_debugfs_root_entry = NULL; 1097 pde = debugfs_create_dir("dasd", NULL); 1098 if (!pde || IS_ERR(pde)) 1099 goto error; 1100 dasd_debugfs_root_entry = pde; 1101 pde = debugfs_create_dir("global", dasd_debugfs_root_entry); 1102 if (!pde || IS_ERR(pde)) 1103 goto error; 1104 dasd_debugfs_global_entry = pde; 1105 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); 1106 return; 1107 1108 error: 1109 DBF_EVENT(DBF_ERR, "%s", 1110 "Creation of the dasd debugfs interface failed"); 1111 dasd_statistics_removeroot(); 1112 return; 1113 } 1114 1115 #else 1116 #define dasd_profile_start(block, cqr, req) do {} while (0) 1117 #define dasd_profile_end(block, cqr, req) do {} while (0) 1118 1119 static void dasd_statistics_createroot(void) 1120 { 1121 return; 1122 } 1123 1124 static void dasd_statistics_removeroot(void) 1125 { 1126 return; 1127 } 1128 1129 int dasd_stats_generic_show(struct seq_file *m, void *v) 1130 { 1131 seq_puts(m, "Statistics are not activated in this kernel\n"); 1132 return 0; 1133 } 1134 1135 static void dasd_profile_init(struct dasd_profile *profile, 1136 struct dentry *base_dentry) 1137 { 1138 return; 1139 } 1140 1141 static void dasd_profile_exit(struct dasd_profile *profile) 1142 { 1143 return; 1144 } 1145 1146 int dasd_profile_on(struct dasd_profile *profile) 1147 { 1148 return 0; 1149 } 1150 1151 #endif /* CONFIG_DASD_PROFILE */ 1152 1153 /* 1154 * Allocate memory for a channel program with 'cplength' channel 1155 * command words and 'datasize' additional space. There are two 1156 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed 1157 * memory and 2) dasd_smalloc_request uses the static ccw memory 1158 * that gets allocated for each device. 1159 */ 1160 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, 1161 int datasize, 1162 struct dasd_device *device) 1163 { 1164 struct dasd_ccw_req *cqr; 1165 1166 /* Sanity checks */ 1167 BUG_ON(datasize > PAGE_SIZE || 1168 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 1169 1170 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); 1171 if (cqr == NULL) 1172 return ERR_PTR(-ENOMEM); 1173 cqr->cpaddr = NULL; 1174 if (cplength > 0) { 1175 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), 1176 GFP_ATOMIC | GFP_DMA); 1177 if (cqr->cpaddr == NULL) { 1178 kfree(cqr); 1179 return ERR_PTR(-ENOMEM); 1180 } 1181 } 1182 cqr->data = NULL; 1183 if (datasize > 0) { 1184 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); 1185 if (cqr->data == NULL) { 1186 kfree(cqr->cpaddr); 1187 kfree(cqr); 1188 return ERR_PTR(-ENOMEM); 1189 } 1190 } 1191 cqr->magic = magic; 1192 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1193 dasd_get_device(device); 1194 return cqr; 1195 } 1196 EXPORT_SYMBOL(dasd_kmalloc_request); 1197 1198 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, 1199 int datasize, 1200 struct dasd_device *device) 1201 { 1202 unsigned long flags; 1203 struct dasd_ccw_req *cqr; 1204 char *data; 1205 int size; 1206 1207 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 1208 if (cplength > 0) 1209 size += cplength * sizeof(struct ccw1); 1210 if (datasize > 0) 1211 size += datasize; 1212 spin_lock_irqsave(&device->mem_lock, flags); 1213 cqr = (struct dasd_ccw_req *) 1214 dasd_alloc_chunk(&device->ccw_chunks, size); 1215 spin_unlock_irqrestore(&device->mem_lock, flags); 1216 if (cqr == NULL) 1217 return ERR_PTR(-ENOMEM); 1218 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 1219 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 1220 cqr->cpaddr = NULL; 1221 if (cplength > 0) { 1222 cqr->cpaddr = (struct ccw1 *) data; 1223 data += cplength*sizeof(struct ccw1); 1224 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 1225 } 1226 cqr->data = NULL; 1227 if (datasize > 0) { 1228 cqr->data = data; 1229 memset(cqr->data, 0, datasize); 1230 } 1231 cqr->magic = magic; 1232 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1233 dasd_get_device(device); 1234 return cqr; 1235 } 1236 EXPORT_SYMBOL(dasd_smalloc_request); 1237 1238 /* 1239 * Free memory of a channel program. This function needs to free all the 1240 * idal lists that might have been created by dasd_set_cda and the 1241 * struct dasd_ccw_req itself. 1242 */ 1243 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1244 { 1245 struct ccw1 *ccw; 1246 1247 /* Clear any idals used for the request. */ 1248 ccw = cqr->cpaddr; 1249 do { 1250 clear_normalized_cda(ccw); 1251 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); 1252 kfree(cqr->cpaddr); 1253 kfree(cqr->data); 1254 kfree(cqr); 1255 dasd_put_device(device); 1256 } 1257 EXPORT_SYMBOL(dasd_kfree_request); 1258 1259 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1260 { 1261 unsigned long flags; 1262 1263 spin_lock_irqsave(&device->mem_lock, flags); 1264 dasd_free_chunk(&device->ccw_chunks, cqr); 1265 spin_unlock_irqrestore(&device->mem_lock, flags); 1266 dasd_put_device(device); 1267 } 1268 EXPORT_SYMBOL(dasd_sfree_request); 1269 1270 /* 1271 * Check discipline magic in cqr. 1272 */ 1273 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) 1274 { 1275 struct dasd_device *device; 1276 1277 if (cqr == NULL) 1278 return -EINVAL; 1279 device = cqr->startdev; 1280 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { 1281 DBF_DEV_EVENT(DBF_WARNING, device, 1282 " dasd_ccw_req 0x%08x magic doesn't match" 1283 " discipline 0x%08x", 1284 cqr->magic, 1285 *(unsigned int *) device->discipline->name); 1286 return -EINVAL; 1287 } 1288 return 0; 1289 } 1290 1291 /* 1292 * Terminate the current i/o and set the request to clear_pending. 1293 * Timer keeps device runnig. 1294 * ccw_device_clear can fail if the i/o subsystem 1295 * is in a bad mood. 1296 */ 1297 int dasd_term_IO(struct dasd_ccw_req *cqr) 1298 { 1299 struct dasd_device *device; 1300 int retries, rc; 1301 char errorstring[ERRORLENGTH]; 1302 1303 /* Check the cqr */ 1304 rc = dasd_check_cqr(cqr); 1305 if (rc) 1306 return rc; 1307 retries = 0; 1308 device = (struct dasd_device *) cqr->startdev; 1309 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { 1310 rc = ccw_device_clear(device->cdev, (long) cqr); 1311 switch (rc) { 1312 case 0: /* termination successful */ 1313 cqr->status = DASD_CQR_CLEAR_PENDING; 1314 cqr->stopclk = get_tod_clock(); 1315 cqr->starttime = 0; 1316 DBF_DEV_EVENT(DBF_DEBUG, device, 1317 "terminate cqr %p successful", 1318 cqr); 1319 break; 1320 case -ENODEV: 1321 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1322 "device gone, retry"); 1323 break; 1324 case -EIO: 1325 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1326 "I/O error, retry"); 1327 break; 1328 case -EINVAL: 1329 /* 1330 * device not valid so no I/O could be running 1331 * handle CQR as termination successful 1332 */ 1333 cqr->status = DASD_CQR_CLEARED; 1334 cqr->stopclk = get_tod_clock(); 1335 cqr->starttime = 0; 1336 /* no retries for invalid devices */ 1337 cqr->retries = -1; 1338 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1339 "EINVAL, handle as terminated"); 1340 /* fake rc to success */ 1341 rc = 0; 1342 break; 1343 case -EBUSY: 1344 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1345 "device busy, retry later"); 1346 break; 1347 default: 1348 /* internal error 10 - unknown rc*/ 1349 snprintf(errorstring, ERRORLENGTH, "10 %d", rc); 1350 dev_err(&device->cdev->dev, "An error occurred in the " 1351 "DASD device driver, reason=%s\n", errorstring); 1352 BUG(); 1353 break; 1354 } 1355 retries++; 1356 } 1357 dasd_schedule_device_bh(device); 1358 return rc; 1359 } 1360 EXPORT_SYMBOL(dasd_term_IO); 1361 1362 /* 1363 * Start the i/o. This start_IO can fail if the channel is really busy. 1364 * In that case set up a timer to start the request later. 1365 */ 1366 int dasd_start_IO(struct dasd_ccw_req *cqr) 1367 { 1368 struct dasd_device *device; 1369 int rc; 1370 char errorstring[ERRORLENGTH]; 1371 1372 /* Check the cqr */ 1373 rc = dasd_check_cqr(cqr); 1374 if (rc) { 1375 cqr->intrc = rc; 1376 return rc; 1377 } 1378 device = (struct dasd_device *) cqr->startdev; 1379 if (((cqr->block && 1380 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || 1381 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && 1382 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 1383 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " 1384 "because of stolen lock", cqr); 1385 cqr->status = DASD_CQR_ERROR; 1386 cqr->intrc = -EPERM; 1387 return -EPERM; 1388 } 1389 if (cqr->retries < 0) { 1390 /* internal error 14 - start_IO run out of retries */ 1391 sprintf(errorstring, "14 %p", cqr); 1392 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1393 "device driver, reason=%s\n", errorstring); 1394 cqr->status = DASD_CQR_ERROR; 1395 return -EIO; 1396 } 1397 cqr->startclk = get_tod_clock(); 1398 cqr->starttime = jiffies; 1399 cqr->retries--; 1400 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1401 cqr->lpm &= device->path_data.opm; 1402 if (!cqr->lpm) 1403 cqr->lpm = device->path_data.opm; 1404 } 1405 if (cqr->cpmode == 1) { 1406 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, 1407 (long) cqr, cqr->lpm); 1408 } else { 1409 rc = ccw_device_start(device->cdev, cqr->cpaddr, 1410 (long) cqr, cqr->lpm, 0); 1411 } 1412 switch (rc) { 1413 case 0: 1414 cqr->status = DASD_CQR_IN_IO; 1415 break; 1416 case -EBUSY: 1417 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1418 "start_IO: device busy, retry later"); 1419 break; 1420 case -ETIMEDOUT: 1421 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1422 "start_IO: request timeout, retry later"); 1423 break; 1424 case -EACCES: 1425 /* -EACCES indicates that the request used only a subset of the 1426 * available paths and all these paths are gone. If the lpm of 1427 * this request was only a subset of the opm (e.g. the ppm) then 1428 * we just do a retry with all available paths. 1429 * If we already use the full opm, something is amiss, and we 1430 * need a full path verification. 1431 */ 1432 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1433 DBF_DEV_EVENT(DBF_WARNING, device, 1434 "start_IO: selected paths gone (%x)", 1435 cqr->lpm); 1436 } else if (cqr->lpm != device->path_data.opm) { 1437 cqr->lpm = device->path_data.opm; 1438 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 1439 "start_IO: selected paths gone," 1440 " retry on all paths"); 1441 } else { 1442 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1443 "start_IO: all paths in opm gone," 1444 " do path verification"); 1445 dasd_generic_last_path_gone(device); 1446 device->path_data.opm = 0; 1447 device->path_data.ppm = 0; 1448 device->path_data.npm = 0; 1449 device->path_data.tbvpm = 1450 ccw_device_get_path_mask(device->cdev); 1451 } 1452 break; 1453 case -ENODEV: 1454 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1455 "start_IO: -ENODEV device gone, retry"); 1456 break; 1457 case -EIO: 1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1459 "start_IO: -EIO device gone, retry"); 1460 break; 1461 case -EINVAL: 1462 /* most likely caused in power management context */ 1463 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1464 "start_IO: -EINVAL device currently " 1465 "not accessible"); 1466 break; 1467 default: 1468 /* internal error 11 - unknown rc */ 1469 snprintf(errorstring, ERRORLENGTH, "11 %d", rc); 1470 dev_err(&device->cdev->dev, 1471 "An error occurred in the DASD device driver, " 1472 "reason=%s\n", errorstring); 1473 BUG(); 1474 break; 1475 } 1476 cqr->intrc = rc; 1477 return rc; 1478 } 1479 EXPORT_SYMBOL(dasd_start_IO); 1480 1481 /* 1482 * Timeout function for dasd devices. This is used for different purposes 1483 * 1) missing interrupt handler for normal operation 1484 * 2) delayed start of request where start_IO failed with -EBUSY 1485 * 3) timeout for missing state change interrupts 1486 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), 1487 * DASD_CQR_QUEUED for 2) and 3). 1488 */ 1489 static void dasd_device_timeout(unsigned long ptr) 1490 { 1491 unsigned long flags; 1492 struct dasd_device *device; 1493 1494 device = (struct dasd_device *) ptr; 1495 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 1496 /* re-activate request queue */ 1497 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1498 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 1499 dasd_schedule_device_bh(device); 1500 } 1501 1502 /* 1503 * Setup timeout for a device in jiffies. 1504 */ 1505 void dasd_device_set_timer(struct dasd_device *device, int expires) 1506 { 1507 if (expires == 0) 1508 del_timer(&device->timer); 1509 else 1510 mod_timer(&device->timer, jiffies + expires); 1511 } 1512 EXPORT_SYMBOL(dasd_device_set_timer); 1513 1514 /* 1515 * Clear timeout for a device. 1516 */ 1517 void dasd_device_clear_timer(struct dasd_device *device) 1518 { 1519 del_timer(&device->timer); 1520 } 1521 EXPORT_SYMBOL(dasd_device_clear_timer); 1522 1523 static void dasd_handle_killed_request(struct ccw_device *cdev, 1524 unsigned long intparm) 1525 { 1526 struct dasd_ccw_req *cqr; 1527 struct dasd_device *device; 1528 1529 if (!intparm) 1530 return; 1531 cqr = (struct dasd_ccw_req *) intparm; 1532 if (cqr->status != DASD_CQR_IN_IO) { 1533 DBF_EVENT_DEVID(DBF_DEBUG, cdev, 1534 "invalid status in handle_killed_request: " 1535 "%02x", cqr->status); 1536 return; 1537 } 1538 1539 device = dasd_device_from_cdev_locked(cdev); 1540 if (IS_ERR(device)) { 1541 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1542 "unable to get device from cdev"); 1543 return; 1544 } 1545 1546 if (!cqr->startdev || 1547 device != cqr->startdev || 1548 strncmp(cqr->startdev->discipline->ebcname, 1549 (char *) &cqr->magic, 4)) { 1550 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1551 "invalid device in request"); 1552 dasd_put_device(device); 1553 return; 1554 } 1555 1556 /* Schedule request to be retried. */ 1557 cqr->status = DASD_CQR_QUEUED; 1558 1559 dasd_device_clear_timer(device); 1560 dasd_schedule_device_bh(device); 1561 dasd_put_device(device); 1562 } 1563 1564 void dasd_generic_handle_state_change(struct dasd_device *device) 1565 { 1566 /* First of all start sense subsystem status request. */ 1567 dasd_eer_snss(device); 1568 1569 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1570 dasd_schedule_device_bh(device); 1571 if (device->block) 1572 dasd_schedule_block_bh(device->block); 1573 } 1574 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); 1575 1576 /* 1577 * Interrupt handler for "normal" ssch-io based dasd devices. 1578 */ 1579 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 1580 struct irb *irb) 1581 { 1582 struct dasd_ccw_req *cqr, *next; 1583 struct dasd_device *device; 1584 unsigned long long now; 1585 int expires; 1586 1587 if (IS_ERR(irb)) { 1588 switch (PTR_ERR(irb)) { 1589 case -EIO: 1590 break; 1591 case -ETIMEDOUT: 1592 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1593 "request timed out\n", __func__); 1594 break; 1595 default: 1596 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1597 "unknown error %ld\n", __func__, 1598 PTR_ERR(irb)); 1599 } 1600 dasd_handle_killed_request(cdev, intparm); 1601 return; 1602 } 1603 1604 now = get_tod_clock(); 1605 cqr = (struct dasd_ccw_req *) intparm; 1606 /* check for conditions that should be handled immediately */ 1607 if (!cqr || 1608 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1609 scsw_cstat(&irb->scsw) == 0)) { 1610 if (cqr) 1611 memcpy(&cqr->irb, irb, sizeof(*irb)); 1612 device = dasd_device_from_cdev_locked(cdev); 1613 if (IS_ERR(device)) 1614 return; 1615 /* ignore unsolicited interrupts for DIAG discipline */ 1616 if (device->discipline == dasd_diag_discipline_pointer) { 1617 dasd_put_device(device); 1618 return; 1619 } 1620 device->discipline->dump_sense_dbf(device, irb, "int"); 1621 if (device->features & DASD_FEATURE_ERPLOG) 1622 device->discipline->dump_sense(device, cqr, irb); 1623 device->discipline->check_for_device_change(device, cqr, irb); 1624 dasd_put_device(device); 1625 } 1626 1627 /* check for for attention message */ 1628 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { 1629 device = dasd_device_from_cdev_locked(cdev); 1630 device->discipline->check_attention(device, irb->esw.esw1.lpum); 1631 dasd_put_device(device); 1632 } 1633 1634 if (!cqr) 1635 return; 1636 1637 device = (struct dasd_device *) cqr->startdev; 1638 if (!device || 1639 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 1640 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1641 "invalid device in request"); 1642 return; 1643 } 1644 1645 /* Check for clear pending */ 1646 if (cqr->status == DASD_CQR_CLEAR_PENDING && 1647 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { 1648 cqr->status = DASD_CQR_CLEARED; 1649 dasd_device_clear_timer(device); 1650 wake_up(&dasd_flush_wq); 1651 dasd_schedule_device_bh(device); 1652 return; 1653 } 1654 1655 /* check status - the request might have been killed by dyn detach */ 1656 if (cqr->status != DASD_CQR_IN_IO) { 1657 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " 1658 "status %02x", dev_name(&cdev->dev), cqr->status); 1659 return; 1660 } 1661 1662 next = NULL; 1663 expires = 0; 1664 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1665 scsw_cstat(&irb->scsw) == 0) { 1666 /* request was completed successfully */ 1667 cqr->status = DASD_CQR_SUCCESS; 1668 cqr->stopclk = now; 1669 /* Start first request on queue if possible -> fast_io. */ 1670 if (cqr->devlist.next != &device->ccw_queue) { 1671 next = list_entry(cqr->devlist.next, 1672 struct dasd_ccw_req, devlist); 1673 } 1674 } else { /* error */ 1675 /* 1676 * If we don't want complex ERP for this request, then just 1677 * reset this and retry it in the fastpath 1678 */ 1679 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && 1680 cqr->retries > 0) { 1681 if (cqr->lpm == device->path_data.opm) 1682 DBF_DEV_EVENT(DBF_DEBUG, device, 1683 "default ERP in fastpath " 1684 "(%i retries left)", 1685 cqr->retries); 1686 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 1687 cqr->lpm = device->path_data.opm; 1688 cqr->status = DASD_CQR_QUEUED; 1689 next = cqr; 1690 } else 1691 cqr->status = DASD_CQR_ERROR; 1692 } 1693 if (next && (next->status == DASD_CQR_QUEUED) && 1694 (!device->stopped)) { 1695 if (device->discipline->start_IO(next) == 0) 1696 expires = next->expires; 1697 } 1698 if (expires != 0) 1699 dasd_device_set_timer(device, expires); 1700 else 1701 dasd_device_clear_timer(device); 1702 dasd_schedule_device_bh(device); 1703 } 1704 EXPORT_SYMBOL(dasd_int_handler); 1705 1706 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) 1707 { 1708 struct dasd_device *device; 1709 1710 device = dasd_device_from_cdev_locked(cdev); 1711 1712 if (IS_ERR(device)) 1713 goto out; 1714 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1715 device->state != device->target || 1716 !device->discipline->check_for_device_change){ 1717 dasd_put_device(device); 1718 goto out; 1719 } 1720 if (device->discipline->dump_sense_dbf) 1721 device->discipline->dump_sense_dbf(device, irb, "uc"); 1722 device->discipline->check_for_device_change(device, NULL, irb); 1723 dasd_put_device(device); 1724 out: 1725 return UC_TODO_RETRY; 1726 } 1727 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); 1728 1729 /* 1730 * If we have an error on a dasd_block layer request then we cancel 1731 * and return all further requests from the same dasd_block as well. 1732 */ 1733 static void __dasd_device_recovery(struct dasd_device *device, 1734 struct dasd_ccw_req *ref_cqr) 1735 { 1736 struct list_head *l, *n; 1737 struct dasd_ccw_req *cqr; 1738 1739 /* 1740 * only requeue request that came from the dasd_block layer 1741 */ 1742 if (!ref_cqr->block) 1743 return; 1744 1745 list_for_each_safe(l, n, &device->ccw_queue) { 1746 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1747 if (cqr->status == DASD_CQR_QUEUED && 1748 ref_cqr->block == cqr->block) { 1749 cqr->status = DASD_CQR_CLEARED; 1750 } 1751 } 1752 }; 1753 1754 /* 1755 * Remove those ccw requests from the queue that need to be returned 1756 * to the upper layer. 1757 */ 1758 static void __dasd_device_process_ccw_queue(struct dasd_device *device, 1759 struct list_head *final_queue) 1760 { 1761 struct list_head *l, *n; 1762 struct dasd_ccw_req *cqr; 1763 1764 /* Process request with final status. */ 1765 list_for_each_safe(l, n, &device->ccw_queue) { 1766 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1767 1768 /* Skip any non-final request. */ 1769 if (cqr->status == DASD_CQR_QUEUED || 1770 cqr->status == DASD_CQR_IN_IO || 1771 cqr->status == DASD_CQR_CLEAR_PENDING) 1772 continue; 1773 if (cqr->status == DASD_CQR_ERROR) { 1774 __dasd_device_recovery(device, cqr); 1775 } 1776 /* Rechain finished requests to final queue */ 1777 list_move_tail(&cqr->devlist, final_queue); 1778 } 1779 } 1780 1781 /* 1782 * the cqrs from the final queue are returned to the upper layer 1783 * by setting a dasd_block state and calling the callback function 1784 */ 1785 static void __dasd_device_process_final_queue(struct dasd_device *device, 1786 struct list_head *final_queue) 1787 { 1788 struct list_head *l, *n; 1789 struct dasd_ccw_req *cqr; 1790 struct dasd_block *block; 1791 void (*callback)(struct dasd_ccw_req *, void *data); 1792 void *callback_data; 1793 char errorstring[ERRORLENGTH]; 1794 1795 list_for_each_safe(l, n, final_queue) { 1796 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1797 list_del_init(&cqr->devlist); 1798 block = cqr->block; 1799 callback = cqr->callback; 1800 callback_data = cqr->callback_data; 1801 if (block) 1802 spin_lock_bh(&block->queue_lock); 1803 switch (cqr->status) { 1804 case DASD_CQR_SUCCESS: 1805 cqr->status = DASD_CQR_DONE; 1806 break; 1807 case DASD_CQR_ERROR: 1808 cqr->status = DASD_CQR_NEED_ERP; 1809 break; 1810 case DASD_CQR_CLEARED: 1811 cqr->status = DASD_CQR_TERMINATED; 1812 break; 1813 default: 1814 /* internal error 12 - wrong cqr status*/ 1815 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); 1816 dev_err(&device->cdev->dev, 1817 "An error occurred in the DASD device driver, " 1818 "reason=%s\n", errorstring); 1819 BUG(); 1820 } 1821 if (cqr->callback != NULL) 1822 (callback)(cqr, callback_data); 1823 if (block) 1824 spin_unlock_bh(&block->queue_lock); 1825 } 1826 } 1827 1828 /* 1829 * Take a look at the first request on the ccw queue and check 1830 * if it reached its expire time. If so, terminate the IO. 1831 */ 1832 static void __dasd_device_check_expire(struct dasd_device *device) 1833 { 1834 struct dasd_ccw_req *cqr; 1835 1836 if (list_empty(&device->ccw_queue)) 1837 return; 1838 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1839 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && 1840 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { 1841 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 1842 /* 1843 * IO in safe offline processing should not 1844 * run out of retries 1845 */ 1846 cqr->retries++; 1847 } 1848 if (device->discipline->term_IO(cqr) != 0) { 1849 /* Hmpf, try again in 5 sec */ 1850 dev_err(&device->cdev->dev, 1851 "cqr %p timed out (%lus) but cannot be " 1852 "ended, retrying in 5 s\n", 1853 cqr, (cqr->expires/HZ)); 1854 cqr->expires += 5*HZ; 1855 dasd_device_set_timer(device, 5*HZ); 1856 } else { 1857 dev_err(&device->cdev->dev, 1858 "cqr %p timed out (%lus), %i retries " 1859 "remaining\n", cqr, (cqr->expires/HZ), 1860 cqr->retries); 1861 } 1862 } 1863 } 1864 1865 /* 1866 * return 1 when device is not eligible for IO 1867 */ 1868 static int __dasd_device_is_unusable(struct dasd_device *device, 1869 struct dasd_ccw_req *cqr) 1870 { 1871 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM); 1872 1873 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 1874 /* dasd is being set offline. */ 1875 return 1; 1876 } 1877 if (device->stopped) { 1878 if (device->stopped & mask) { 1879 /* stopped and CQR will not change that. */ 1880 return 1; 1881 } 1882 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1883 /* CQR is not able to change device to 1884 * operational. */ 1885 return 1; 1886 } 1887 /* CQR required to get device operational. */ 1888 } 1889 return 0; 1890 } 1891 1892 /* 1893 * Take a look at the first request on the ccw queue and check 1894 * if it needs to be started. 1895 */ 1896 static void __dasd_device_start_head(struct dasd_device *device) 1897 { 1898 struct dasd_ccw_req *cqr; 1899 int rc; 1900 1901 if (list_empty(&device->ccw_queue)) 1902 return; 1903 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1904 if (cqr->status != DASD_CQR_QUEUED) 1905 return; 1906 /* if device is not usable return request to upper layer */ 1907 if (__dasd_device_is_unusable(device, cqr)) { 1908 cqr->intrc = -EAGAIN; 1909 cqr->status = DASD_CQR_CLEARED; 1910 dasd_schedule_device_bh(device); 1911 return; 1912 } 1913 1914 rc = device->discipline->start_IO(cqr); 1915 if (rc == 0) 1916 dasd_device_set_timer(device, cqr->expires); 1917 else if (rc == -EACCES) { 1918 dasd_schedule_device_bh(device); 1919 } else 1920 /* Hmpf, try again in 1/2 sec */ 1921 dasd_device_set_timer(device, 50); 1922 } 1923 1924 static void __dasd_device_check_path_events(struct dasd_device *device) 1925 { 1926 int rc; 1927 1928 if (device->path_data.tbvpm) { 1929 if (device->stopped & ~(DASD_STOPPED_DC_WAIT | 1930 DASD_UNRESUMED_PM)) 1931 return; 1932 rc = device->discipline->verify_path( 1933 device, device->path_data.tbvpm); 1934 if (rc) 1935 dasd_device_set_timer(device, 50); 1936 else 1937 device->path_data.tbvpm = 0; 1938 } 1939 }; 1940 1941 /* 1942 * Go through all request on the dasd_device request queue, 1943 * terminate them on the cdev if necessary, and return them to the 1944 * submitting layer via callback. 1945 * Note: 1946 * Make sure that all 'submitting layers' still exist when 1947 * this function is called!. In other words, when 'device' is a base 1948 * device then all block layer requests must have been removed before 1949 * via dasd_flush_block_queue. 1950 */ 1951 int dasd_flush_device_queue(struct dasd_device *device) 1952 { 1953 struct dasd_ccw_req *cqr, *n; 1954 int rc; 1955 struct list_head flush_queue; 1956 1957 INIT_LIST_HEAD(&flush_queue); 1958 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1959 rc = 0; 1960 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 1961 /* Check status and move request to flush_queue */ 1962 switch (cqr->status) { 1963 case DASD_CQR_IN_IO: 1964 rc = device->discipline->term_IO(cqr); 1965 if (rc) { 1966 /* unable to terminate requeust */ 1967 dev_err(&device->cdev->dev, 1968 "Flushing the DASD request queue " 1969 "failed for request %p\n", cqr); 1970 /* stop flush processing */ 1971 goto finished; 1972 } 1973 break; 1974 case DASD_CQR_QUEUED: 1975 cqr->stopclk = get_tod_clock(); 1976 cqr->status = DASD_CQR_CLEARED; 1977 break; 1978 default: /* no need to modify the others */ 1979 break; 1980 } 1981 list_move_tail(&cqr->devlist, &flush_queue); 1982 } 1983 finished: 1984 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1985 /* 1986 * After this point all requests must be in state CLEAR_PENDING, 1987 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become 1988 * one of the others. 1989 */ 1990 list_for_each_entry_safe(cqr, n, &flush_queue, devlist) 1991 wait_event(dasd_flush_wq, 1992 (cqr->status != DASD_CQR_CLEAR_PENDING)); 1993 /* 1994 * Now set each request back to TERMINATED, DONE or NEED_ERP 1995 * and call the callback function of flushed requests 1996 */ 1997 __dasd_device_process_final_queue(device, &flush_queue); 1998 return rc; 1999 } 2000 EXPORT_SYMBOL_GPL(dasd_flush_device_queue); 2001 2002 /* 2003 * Acquire the device lock and process queues for the device. 2004 */ 2005 static void dasd_device_tasklet(struct dasd_device *device) 2006 { 2007 struct list_head final_queue; 2008 2009 atomic_set (&device->tasklet_scheduled, 0); 2010 INIT_LIST_HEAD(&final_queue); 2011 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2012 /* Check expire time of first request on the ccw queue. */ 2013 __dasd_device_check_expire(device); 2014 /* find final requests on ccw queue */ 2015 __dasd_device_process_ccw_queue(device, &final_queue); 2016 __dasd_device_check_path_events(device); 2017 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2018 /* Now call the callback function of requests with final status */ 2019 __dasd_device_process_final_queue(device, &final_queue); 2020 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2021 /* Now check if the head of the ccw queue needs to be started. */ 2022 __dasd_device_start_head(device); 2023 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2024 if (waitqueue_active(&shutdown_waitq)) 2025 wake_up(&shutdown_waitq); 2026 dasd_put_device(device); 2027 } 2028 2029 /* 2030 * Schedules a call to dasd_tasklet over the device tasklet. 2031 */ 2032 void dasd_schedule_device_bh(struct dasd_device *device) 2033 { 2034 /* Protect against rescheduling. */ 2035 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) 2036 return; 2037 dasd_get_device(device); 2038 tasklet_hi_schedule(&device->tasklet); 2039 } 2040 EXPORT_SYMBOL(dasd_schedule_device_bh); 2041 2042 void dasd_device_set_stop_bits(struct dasd_device *device, int bits) 2043 { 2044 device->stopped |= bits; 2045 } 2046 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); 2047 2048 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) 2049 { 2050 device->stopped &= ~bits; 2051 if (!device->stopped) 2052 wake_up(&generic_waitq); 2053 } 2054 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); 2055 2056 /* 2057 * Queue a request to the head of the device ccw_queue. 2058 * Start the I/O if possible. 2059 */ 2060 void dasd_add_request_head(struct dasd_ccw_req *cqr) 2061 { 2062 struct dasd_device *device; 2063 unsigned long flags; 2064 2065 device = cqr->startdev; 2066 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2067 cqr->status = DASD_CQR_QUEUED; 2068 list_add(&cqr->devlist, &device->ccw_queue); 2069 /* let the bh start the request to keep them in order */ 2070 dasd_schedule_device_bh(device); 2071 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2072 } 2073 EXPORT_SYMBOL(dasd_add_request_head); 2074 2075 /* 2076 * Queue a request to the tail of the device ccw_queue. 2077 * Start the I/O if possible. 2078 */ 2079 void dasd_add_request_tail(struct dasd_ccw_req *cqr) 2080 { 2081 struct dasd_device *device; 2082 unsigned long flags; 2083 2084 device = cqr->startdev; 2085 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2086 cqr->status = DASD_CQR_QUEUED; 2087 list_add_tail(&cqr->devlist, &device->ccw_queue); 2088 /* let the bh start the request to keep them in order */ 2089 dasd_schedule_device_bh(device); 2090 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2091 } 2092 EXPORT_SYMBOL(dasd_add_request_tail); 2093 2094 /* 2095 * Wakeup helper for the 'sleep_on' functions. 2096 */ 2097 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) 2098 { 2099 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2100 cqr->callback_data = DASD_SLEEPON_END_TAG; 2101 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2102 wake_up(&generic_waitq); 2103 } 2104 EXPORT_SYMBOL_GPL(dasd_wakeup_cb); 2105 2106 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) 2107 { 2108 struct dasd_device *device; 2109 int rc; 2110 2111 device = cqr->startdev; 2112 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2113 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); 2114 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2115 return rc; 2116 } 2117 2118 /* 2119 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. 2120 */ 2121 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) 2122 { 2123 struct dasd_device *device; 2124 dasd_erp_fn_t erp_fn; 2125 2126 if (cqr->status == DASD_CQR_FILLED) 2127 return 0; 2128 device = cqr->startdev; 2129 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2130 if (cqr->status == DASD_CQR_TERMINATED) { 2131 device->discipline->handle_terminated_request(cqr); 2132 return 1; 2133 } 2134 if (cqr->status == DASD_CQR_NEED_ERP) { 2135 erp_fn = device->discipline->erp_action(cqr); 2136 erp_fn(cqr); 2137 return 1; 2138 } 2139 if (cqr->status == DASD_CQR_FAILED) 2140 dasd_log_sense(cqr, &cqr->irb); 2141 if (cqr->refers) { 2142 __dasd_process_erp(device, cqr); 2143 return 1; 2144 } 2145 } 2146 return 0; 2147 } 2148 2149 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) 2150 { 2151 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2152 if (cqr->refers) /* erp is not done yet */ 2153 return 1; 2154 return ((cqr->status != DASD_CQR_DONE) && 2155 (cqr->status != DASD_CQR_FAILED)); 2156 } else 2157 return (cqr->status == DASD_CQR_FILLED); 2158 } 2159 2160 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) 2161 { 2162 struct dasd_device *device; 2163 int rc; 2164 struct list_head ccw_queue; 2165 struct dasd_ccw_req *cqr; 2166 2167 INIT_LIST_HEAD(&ccw_queue); 2168 maincqr->status = DASD_CQR_FILLED; 2169 device = maincqr->startdev; 2170 list_add(&maincqr->blocklist, &ccw_queue); 2171 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); 2172 cqr = list_first_entry(&ccw_queue, 2173 struct dasd_ccw_req, blocklist)) { 2174 2175 if (__dasd_sleep_on_erp(cqr)) 2176 continue; 2177 if (cqr->status != DASD_CQR_FILLED) /* could be failed */ 2178 continue; 2179 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2180 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2181 cqr->status = DASD_CQR_FAILED; 2182 cqr->intrc = -EPERM; 2183 continue; 2184 } 2185 /* Non-temporary stop condition will trigger fail fast */ 2186 if (device->stopped & ~DASD_STOPPED_PENDING && 2187 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2188 (!dasd_eer_enabled(device))) { 2189 cqr->status = DASD_CQR_FAILED; 2190 cqr->intrc = -ENOLINK; 2191 continue; 2192 } 2193 /* 2194 * Don't try to start requests if device is stopped 2195 * except path verification requests 2196 */ 2197 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 2198 if (interruptible) { 2199 rc = wait_event_interruptible( 2200 generic_waitq, !(device->stopped)); 2201 if (rc == -ERESTARTSYS) { 2202 cqr->status = DASD_CQR_FAILED; 2203 maincqr->intrc = rc; 2204 continue; 2205 } 2206 } else 2207 wait_event(generic_waitq, !(device->stopped)); 2208 } 2209 if (!cqr->callback) 2210 cqr->callback = dasd_wakeup_cb; 2211 2212 cqr->callback_data = DASD_SLEEPON_START_TAG; 2213 dasd_add_request_tail(cqr); 2214 if (interruptible) { 2215 rc = wait_event_interruptible( 2216 generic_waitq, _wait_for_wakeup(cqr)); 2217 if (rc == -ERESTARTSYS) { 2218 dasd_cancel_req(cqr); 2219 /* wait (non-interruptible) for final status */ 2220 wait_event(generic_waitq, 2221 _wait_for_wakeup(cqr)); 2222 cqr->status = DASD_CQR_FAILED; 2223 maincqr->intrc = rc; 2224 continue; 2225 } 2226 } else 2227 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2228 } 2229 2230 maincqr->endclk = get_tod_clock(); 2231 if ((maincqr->status != DASD_CQR_DONE) && 2232 (maincqr->intrc != -ERESTARTSYS)) 2233 dasd_log_sense(maincqr, &maincqr->irb); 2234 if (maincqr->status == DASD_CQR_DONE) 2235 rc = 0; 2236 else if (maincqr->intrc) 2237 rc = maincqr->intrc; 2238 else 2239 rc = -EIO; 2240 return rc; 2241 } 2242 2243 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) 2244 { 2245 struct dasd_ccw_req *cqr; 2246 2247 list_for_each_entry(cqr, ccw_queue, blocklist) { 2248 if (cqr->callback_data != DASD_SLEEPON_END_TAG) 2249 return 0; 2250 } 2251 2252 return 1; 2253 } 2254 2255 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) 2256 { 2257 struct dasd_device *device; 2258 struct dasd_ccw_req *cqr, *n; 2259 int rc; 2260 2261 retry: 2262 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { 2263 device = cqr->startdev; 2264 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ 2265 continue; 2266 2267 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2268 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2269 cqr->status = DASD_CQR_FAILED; 2270 cqr->intrc = -EPERM; 2271 continue; 2272 } 2273 /*Non-temporary stop condition will trigger fail fast*/ 2274 if (device->stopped & ~DASD_STOPPED_PENDING && 2275 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2276 !dasd_eer_enabled(device)) { 2277 cqr->status = DASD_CQR_FAILED; 2278 cqr->intrc = -EAGAIN; 2279 continue; 2280 } 2281 2282 /*Don't try to start requests if device is stopped*/ 2283 if (interruptible) { 2284 rc = wait_event_interruptible( 2285 generic_waitq, !device->stopped); 2286 if (rc == -ERESTARTSYS) { 2287 cqr->status = DASD_CQR_FAILED; 2288 cqr->intrc = rc; 2289 continue; 2290 } 2291 } else 2292 wait_event(generic_waitq, !(device->stopped)); 2293 2294 if (!cqr->callback) 2295 cqr->callback = dasd_wakeup_cb; 2296 cqr->callback_data = DASD_SLEEPON_START_TAG; 2297 dasd_add_request_tail(cqr); 2298 } 2299 2300 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); 2301 2302 rc = 0; 2303 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { 2304 /* 2305 * for alias devices simplify error recovery and 2306 * return to upper layer 2307 * do not skip ERP requests 2308 */ 2309 if (cqr->startdev != cqr->basedev && !cqr->refers && 2310 (cqr->status == DASD_CQR_TERMINATED || 2311 cqr->status == DASD_CQR_NEED_ERP)) 2312 return -EAGAIN; 2313 2314 /* normal recovery for basedev IO */ 2315 if (__dasd_sleep_on_erp(cqr)) 2316 /* handle erp first */ 2317 goto retry; 2318 } 2319 2320 return 0; 2321 } 2322 2323 /* 2324 * Queue a request to the tail of the device ccw_queue and wait for 2325 * it's completion. 2326 */ 2327 int dasd_sleep_on(struct dasd_ccw_req *cqr) 2328 { 2329 return _dasd_sleep_on(cqr, 0); 2330 } 2331 EXPORT_SYMBOL(dasd_sleep_on); 2332 2333 /* 2334 * Start requests from a ccw_queue and wait for their completion. 2335 */ 2336 int dasd_sleep_on_queue(struct list_head *ccw_queue) 2337 { 2338 return _dasd_sleep_on_queue(ccw_queue, 0); 2339 } 2340 EXPORT_SYMBOL(dasd_sleep_on_queue); 2341 2342 /* 2343 * Queue a request to the tail of the device ccw_queue and wait 2344 * interruptible for it's completion. 2345 */ 2346 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) 2347 { 2348 return _dasd_sleep_on(cqr, 1); 2349 } 2350 EXPORT_SYMBOL(dasd_sleep_on_interruptible); 2351 2352 /* 2353 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock 2354 * for eckd devices) the currently running request has to be terminated 2355 * and be put back to status queued, before the special request is added 2356 * to the head of the queue. Then the special request is waited on normally. 2357 */ 2358 static inline int _dasd_term_running_cqr(struct dasd_device *device) 2359 { 2360 struct dasd_ccw_req *cqr; 2361 int rc; 2362 2363 if (list_empty(&device->ccw_queue)) 2364 return 0; 2365 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2366 rc = device->discipline->term_IO(cqr); 2367 if (!rc) 2368 /* 2369 * CQR terminated because a more important request is pending. 2370 * Undo decreasing of retry counter because this is 2371 * not an error case. 2372 */ 2373 cqr->retries++; 2374 return rc; 2375 } 2376 2377 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) 2378 { 2379 struct dasd_device *device; 2380 int rc; 2381 2382 device = cqr->startdev; 2383 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2384 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2385 cqr->status = DASD_CQR_FAILED; 2386 cqr->intrc = -EPERM; 2387 return -EIO; 2388 } 2389 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2390 rc = _dasd_term_running_cqr(device); 2391 if (rc) { 2392 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2393 return rc; 2394 } 2395 cqr->callback = dasd_wakeup_cb; 2396 cqr->callback_data = DASD_SLEEPON_START_TAG; 2397 cqr->status = DASD_CQR_QUEUED; 2398 /* 2399 * add new request as second 2400 * first the terminated cqr needs to be finished 2401 */ 2402 list_add(&cqr->devlist, device->ccw_queue.next); 2403 2404 /* let the bh start the request to keep them in order */ 2405 dasd_schedule_device_bh(device); 2406 2407 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2408 2409 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2410 2411 if (cqr->status == DASD_CQR_DONE) 2412 rc = 0; 2413 else if (cqr->intrc) 2414 rc = cqr->intrc; 2415 else 2416 rc = -EIO; 2417 2418 /* kick tasklets */ 2419 dasd_schedule_device_bh(device); 2420 if (device->block) 2421 dasd_schedule_block_bh(device->block); 2422 2423 return rc; 2424 } 2425 EXPORT_SYMBOL(dasd_sleep_on_immediatly); 2426 2427 /* 2428 * Cancels a request that was started with dasd_sleep_on_req. 2429 * This is useful to timeout requests. The request will be 2430 * terminated if it is currently in i/o. 2431 * Returns 0 if request termination was successful 2432 * negative error code if termination failed 2433 * Cancellation of a request is an asynchronous operation! The calling 2434 * function has to wait until the request is properly returned via callback. 2435 */ 2436 int dasd_cancel_req(struct dasd_ccw_req *cqr) 2437 { 2438 struct dasd_device *device = cqr->startdev; 2439 unsigned long flags; 2440 int rc; 2441 2442 rc = 0; 2443 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2444 switch (cqr->status) { 2445 case DASD_CQR_QUEUED: 2446 /* request was not started - just set to cleared */ 2447 cqr->status = DASD_CQR_CLEARED; 2448 if (cqr->callback_data == DASD_SLEEPON_START_TAG) 2449 cqr->callback_data = DASD_SLEEPON_END_TAG; 2450 break; 2451 case DASD_CQR_IN_IO: 2452 /* request in IO - terminate IO and release again */ 2453 rc = device->discipline->term_IO(cqr); 2454 if (rc) { 2455 dev_err(&device->cdev->dev, 2456 "Cancelling request %p failed with rc=%d\n", 2457 cqr, rc); 2458 } else { 2459 cqr->stopclk = get_tod_clock(); 2460 } 2461 break; 2462 default: /* already finished or clear pending - do nothing */ 2463 break; 2464 } 2465 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2466 dasd_schedule_device_bh(device); 2467 return rc; 2468 } 2469 EXPORT_SYMBOL(dasd_cancel_req); 2470 2471 /* 2472 * SECTION: Operations of the dasd_block layer. 2473 */ 2474 2475 /* 2476 * Timeout function for dasd_block. This is used when the block layer 2477 * is waiting for something that may not come reliably, (e.g. a state 2478 * change interrupt) 2479 */ 2480 static void dasd_block_timeout(unsigned long ptr) 2481 { 2482 unsigned long flags; 2483 struct dasd_block *block; 2484 2485 block = (struct dasd_block *) ptr; 2486 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); 2487 /* re-activate request queue */ 2488 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); 2489 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); 2490 dasd_schedule_block_bh(block); 2491 } 2492 2493 /* 2494 * Setup timeout for a dasd_block in jiffies. 2495 */ 2496 void dasd_block_set_timer(struct dasd_block *block, int expires) 2497 { 2498 if (expires == 0) 2499 del_timer(&block->timer); 2500 else 2501 mod_timer(&block->timer, jiffies + expires); 2502 } 2503 EXPORT_SYMBOL(dasd_block_set_timer); 2504 2505 /* 2506 * Clear timeout for a dasd_block. 2507 */ 2508 void dasd_block_clear_timer(struct dasd_block *block) 2509 { 2510 del_timer(&block->timer); 2511 } 2512 EXPORT_SYMBOL(dasd_block_clear_timer); 2513 2514 /* 2515 * Process finished error recovery ccw. 2516 */ 2517 static void __dasd_process_erp(struct dasd_device *device, 2518 struct dasd_ccw_req *cqr) 2519 { 2520 dasd_erp_fn_t erp_fn; 2521 2522 if (cqr->status == DASD_CQR_DONE) 2523 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); 2524 else 2525 dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); 2526 erp_fn = device->discipline->erp_postaction(cqr); 2527 erp_fn(cqr); 2528 } 2529 2530 /* 2531 * Fetch requests from the block device queue. 2532 */ 2533 static void __dasd_process_request_queue(struct dasd_block *block) 2534 { 2535 struct request_queue *queue; 2536 struct request *req; 2537 struct dasd_ccw_req *cqr; 2538 struct dasd_device *basedev; 2539 unsigned long flags; 2540 queue = block->request_queue; 2541 basedev = block->base; 2542 /* No queue ? Then there is nothing to do. */ 2543 if (queue == NULL) 2544 return; 2545 2546 /* 2547 * We requeue request from the block device queue to the ccw 2548 * queue only in two states. In state DASD_STATE_READY the 2549 * partition detection is done and we need to requeue requests 2550 * for that. State DASD_STATE_ONLINE is normal block device 2551 * operation. 2552 */ 2553 if (basedev->state < DASD_STATE_READY) { 2554 while ((req = blk_fetch_request(block->request_queue))) 2555 __blk_end_request_all(req, -EIO); 2556 return; 2557 } 2558 2559 /* 2560 * if device is stopped do not fetch new requests 2561 * except failfast is active which will let requests fail 2562 * immediately in __dasd_block_start_head() 2563 */ 2564 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) 2565 return; 2566 2567 /* Now we try to fetch requests from the request queue */ 2568 while ((req = blk_peek_request(queue))) { 2569 if (basedev->features & DASD_FEATURE_READONLY && 2570 rq_data_dir(req) == WRITE) { 2571 DBF_DEV_EVENT(DBF_ERR, basedev, 2572 "Rejecting write request %p", 2573 req); 2574 blk_start_request(req); 2575 __blk_end_request_all(req, -EIO); 2576 continue; 2577 } 2578 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && 2579 (basedev->features & DASD_FEATURE_FAILFAST || 2580 blk_noretry_request(req))) { 2581 DBF_DEV_EVENT(DBF_ERR, basedev, 2582 "Rejecting failfast request %p", 2583 req); 2584 blk_start_request(req); 2585 __blk_end_request_all(req, -ETIMEDOUT); 2586 continue; 2587 } 2588 cqr = basedev->discipline->build_cp(basedev, block, req); 2589 if (IS_ERR(cqr)) { 2590 if (PTR_ERR(cqr) == -EBUSY) 2591 break; /* normal end condition */ 2592 if (PTR_ERR(cqr) == -ENOMEM) 2593 break; /* terminate request queue loop */ 2594 if (PTR_ERR(cqr) == -EAGAIN) { 2595 /* 2596 * The current request cannot be build right 2597 * now, we have to try later. If this request 2598 * is the head-of-queue we stop the device 2599 * for 1/2 second. 2600 */ 2601 if (!list_empty(&block->ccw_queue)) 2602 break; 2603 spin_lock_irqsave( 2604 get_ccwdev_lock(basedev->cdev), flags); 2605 dasd_device_set_stop_bits(basedev, 2606 DASD_STOPPED_PENDING); 2607 spin_unlock_irqrestore( 2608 get_ccwdev_lock(basedev->cdev), flags); 2609 dasd_block_set_timer(block, HZ/2); 2610 break; 2611 } 2612 DBF_DEV_EVENT(DBF_ERR, basedev, 2613 "CCW creation failed (rc=%ld) " 2614 "on request %p", 2615 PTR_ERR(cqr), req); 2616 blk_start_request(req); 2617 __blk_end_request_all(req, -EIO); 2618 continue; 2619 } 2620 /* 2621 * Note: callback is set to dasd_return_cqr_cb in 2622 * __dasd_block_start_head to cover erp requests as well 2623 */ 2624 cqr->callback_data = (void *) req; 2625 cqr->status = DASD_CQR_FILLED; 2626 req->completion_data = cqr; 2627 blk_start_request(req); 2628 list_add_tail(&cqr->blocklist, &block->ccw_queue); 2629 INIT_LIST_HEAD(&cqr->devlist); 2630 dasd_profile_start(block, cqr, req); 2631 } 2632 } 2633 2634 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) 2635 { 2636 struct request *req; 2637 int status; 2638 int error = 0; 2639 2640 req = (struct request *) cqr->callback_data; 2641 dasd_profile_end(cqr->block, cqr, req); 2642 status = cqr->block->base->discipline->free_cp(cqr, req); 2643 if (status < 0) 2644 error = status; 2645 else if (status == 0) { 2646 if (cqr->intrc == -EPERM) 2647 error = -EBADE; 2648 else if (cqr->intrc == -ENOLINK || 2649 cqr->intrc == -ETIMEDOUT) 2650 error = cqr->intrc; 2651 else 2652 error = -EIO; 2653 } 2654 __blk_end_request_all(req, error); 2655 } 2656 2657 /* 2658 * Process ccw request queue. 2659 */ 2660 static void __dasd_process_block_ccw_queue(struct dasd_block *block, 2661 struct list_head *final_queue) 2662 { 2663 struct list_head *l, *n; 2664 struct dasd_ccw_req *cqr; 2665 dasd_erp_fn_t erp_fn; 2666 unsigned long flags; 2667 struct dasd_device *base = block->base; 2668 2669 restart: 2670 /* Process request with final status. */ 2671 list_for_each_safe(l, n, &block->ccw_queue) { 2672 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2673 if (cqr->status != DASD_CQR_DONE && 2674 cqr->status != DASD_CQR_FAILED && 2675 cqr->status != DASD_CQR_NEED_ERP && 2676 cqr->status != DASD_CQR_TERMINATED) 2677 continue; 2678 2679 if (cqr->status == DASD_CQR_TERMINATED) { 2680 base->discipline->handle_terminated_request(cqr); 2681 goto restart; 2682 } 2683 2684 /* Process requests that may be recovered */ 2685 if (cqr->status == DASD_CQR_NEED_ERP) { 2686 erp_fn = base->discipline->erp_action(cqr); 2687 if (IS_ERR(erp_fn(cqr))) 2688 continue; 2689 goto restart; 2690 } 2691 2692 /* log sense for fatal error */ 2693 if (cqr->status == DASD_CQR_FAILED) { 2694 dasd_log_sense(cqr, &cqr->irb); 2695 } 2696 2697 /* First of all call extended error reporting. */ 2698 if (dasd_eer_enabled(base) && 2699 cqr->status == DASD_CQR_FAILED) { 2700 dasd_eer_write(base, cqr, DASD_EER_FATALERROR); 2701 2702 /* restart request */ 2703 cqr->status = DASD_CQR_FILLED; 2704 cqr->retries = 255; 2705 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 2706 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 2707 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 2708 flags); 2709 goto restart; 2710 } 2711 2712 /* Process finished ERP request. */ 2713 if (cqr->refers) { 2714 __dasd_process_erp(base, cqr); 2715 goto restart; 2716 } 2717 2718 /* Rechain finished requests to final queue */ 2719 cqr->endclk = get_tod_clock(); 2720 list_move_tail(&cqr->blocklist, final_queue); 2721 } 2722 } 2723 2724 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) 2725 { 2726 dasd_schedule_block_bh(cqr->block); 2727 } 2728 2729 static void __dasd_block_start_head(struct dasd_block *block) 2730 { 2731 struct dasd_ccw_req *cqr; 2732 2733 if (list_empty(&block->ccw_queue)) 2734 return; 2735 /* We allways begin with the first requests on the queue, as some 2736 * of previously started requests have to be enqueued on a 2737 * dasd_device again for error recovery. 2738 */ 2739 list_for_each_entry(cqr, &block->ccw_queue, blocklist) { 2740 if (cqr->status != DASD_CQR_FILLED) 2741 continue; 2742 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && 2743 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2744 cqr->status = DASD_CQR_FAILED; 2745 cqr->intrc = -EPERM; 2746 dasd_schedule_block_bh(block); 2747 continue; 2748 } 2749 /* Non-temporary stop condition will trigger fail fast */ 2750 if (block->base->stopped & ~DASD_STOPPED_PENDING && 2751 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2752 (!dasd_eer_enabled(block->base))) { 2753 cqr->status = DASD_CQR_FAILED; 2754 cqr->intrc = -ENOLINK; 2755 dasd_schedule_block_bh(block); 2756 continue; 2757 } 2758 /* Don't try to start requests if device is stopped */ 2759 if (block->base->stopped) 2760 return; 2761 2762 /* just a fail safe check, should not happen */ 2763 if (!cqr->startdev) 2764 cqr->startdev = block->base; 2765 2766 /* make sure that the requests we submit find their way back */ 2767 cqr->callback = dasd_return_cqr_cb; 2768 2769 dasd_add_request_tail(cqr); 2770 } 2771 } 2772 2773 /* 2774 * Central dasd_block layer routine. Takes requests from the generic 2775 * block layer request queue, creates ccw requests, enqueues them on 2776 * a dasd_device and processes ccw requests that have been returned. 2777 */ 2778 static void dasd_block_tasklet(struct dasd_block *block) 2779 { 2780 struct list_head final_queue; 2781 struct list_head *l, *n; 2782 struct dasd_ccw_req *cqr; 2783 2784 atomic_set(&block->tasklet_scheduled, 0); 2785 INIT_LIST_HEAD(&final_queue); 2786 spin_lock(&block->queue_lock); 2787 /* Finish off requests on ccw queue */ 2788 __dasd_process_block_ccw_queue(block, &final_queue); 2789 spin_unlock(&block->queue_lock); 2790 /* Now call the callback function of requests with final status */ 2791 spin_lock_irq(&block->request_queue_lock); 2792 list_for_each_safe(l, n, &final_queue) { 2793 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2794 list_del_init(&cqr->blocklist); 2795 __dasd_cleanup_cqr(cqr); 2796 } 2797 spin_lock(&block->queue_lock); 2798 /* Get new request from the block device request queue */ 2799 __dasd_process_request_queue(block); 2800 /* Now check if the head of the ccw queue needs to be started. */ 2801 __dasd_block_start_head(block); 2802 spin_unlock(&block->queue_lock); 2803 spin_unlock_irq(&block->request_queue_lock); 2804 if (waitqueue_active(&shutdown_waitq)) 2805 wake_up(&shutdown_waitq); 2806 dasd_put_device(block->base); 2807 } 2808 2809 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) 2810 { 2811 wake_up(&dasd_flush_wq); 2812 } 2813 2814 /* 2815 * Requeue a request back to the block request queue 2816 * only works for block requests 2817 */ 2818 static int _dasd_requeue_request(struct dasd_ccw_req *cqr) 2819 { 2820 struct dasd_block *block = cqr->block; 2821 struct request *req; 2822 unsigned long flags; 2823 2824 if (!block) 2825 return -EINVAL; 2826 spin_lock_irqsave(&block->queue_lock, flags); 2827 req = (struct request *) cqr->callback_data; 2828 blk_requeue_request(block->request_queue, req); 2829 spin_unlock_irqrestore(&block->queue_lock, flags); 2830 2831 return 0; 2832 } 2833 2834 /* 2835 * Go through all request on the dasd_block request queue, cancel them 2836 * on the respective dasd_device, and return them to the generic 2837 * block layer. 2838 */ 2839 static int dasd_flush_block_queue(struct dasd_block *block) 2840 { 2841 struct dasd_ccw_req *cqr, *n; 2842 int rc, i; 2843 struct list_head flush_queue; 2844 2845 INIT_LIST_HEAD(&flush_queue); 2846 spin_lock_bh(&block->queue_lock); 2847 rc = 0; 2848 restart: 2849 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 2850 /* if this request currently owned by a dasd_device cancel it */ 2851 if (cqr->status >= DASD_CQR_QUEUED) 2852 rc = dasd_cancel_req(cqr); 2853 if (rc < 0) 2854 break; 2855 /* Rechain request (including erp chain) so it won't be 2856 * touched by the dasd_block_tasklet anymore. 2857 * Replace the callback so we notice when the request 2858 * is returned from the dasd_device layer. 2859 */ 2860 cqr->callback = _dasd_wake_block_flush_cb; 2861 for (i = 0; cqr != NULL; cqr = cqr->refers, i++) 2862 list_move_tail(&cqr->blocklist, &flush_queue); 2863 if (i > 1) 2864 /* moved more than one request - need to restart */ 2865 goto restart; 2866 } 2867 spin_unlock_bh(&block->queue_lock); 2868 /* Now call the callback function of flushed requests */ 2869 restart_cb: 2870 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { 2871 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 2872 /* Process finished ERP request. */ 2873 if (cqr->refers) { 2874 spin_lock_bh(&block->queue_lock); 2875 __dasd_process_erp(block->base, cqr); 2876 spin_unlock_bh(&block->queue_lock); 2877 /* restart list_for_xx loop since dasd_process_erp 2878 * might remove multiple elements */ 2879 goto restart_cb; 2880 } 2881 /* call the callback function */ 2882 spin_lock_irq(&block->request_queue_lock); 2883 cqr->endclk = get_tod_clock(); 2884 list_del_init(&cqr->blocklist); 2885 __dasd_cleanup_cqr(cqr); 2886 spin_unlock_irq(&block->request_queue_lock); 2887 } 2888 return rc; 2889 } 2890 2891 /* 2892 * Schedules a call to dasd_tasklet over the device tasklet. 2893 */ 2894 void dasd_schedule_block_bh(struct dasd_block *block) 2895 { 2896 /* Protect against rescheduling. */ 2897 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) 2898 return; 2899 /* life cycle of block is bound to it's base device */ 2900 dasd_get_device(block->base); 2901 tasklet_hi_schedule(&block->tasklet); 2902 } 2903 EXPORT_SYMBOL(dasd_schedule_block_bh); 2904 2905 2906 /* 2907 * SECTION: external block device operations 2908 * (request queue handling, open, release, etc.) 2909 */ 2910 2911 /* 2912 * Dasd request queue function. Called from ll_rw_blk.c 2913 */ 2914 static void do_dasd_request(struct request_queue *queue) 2915 { 2916 struct dasd_block *block; 2917 2918 block = queue->queuedata; 2919 spin_lock(&block->queue_lock); 2920 /* Get new request from the block device request queue */ 2921 __dasd_process_request_queue(block); 2922 /* Now check if the head of the ccw queue needs to be started. */ 2923 __dasd_block_start_head(block); 2924 spin_unlock(&block->queue_lock); 2925 } 2926 2927 /* 2928 * Block timeout callback, called from the block layer 2929 * 2930 * request_queue lock is held on entry. 2931 * 2932 * Return values: 2933 * BLK_EH_RESET_TIMER if the request should be left running 2934 * BLK_EH_NOT_HANDLED if the request is handled or terminated 2935 * by the driver. 2936 */ 2937 enum blk_eh_timer_return dasd_times_out(struct request *req) 2938 { 2939 struct dasd_ccw_req *cqr = req->completion_data; 2940 struct dasd_block *block = req->q->queuedata; 2941 struct dasd_device *device; 2942 int rc = 0; 2943 2944 if (!cqr) 2945 return BLK_EH_NOT_HANDLED; 2946 2947 device = cqr->startdev ? cqr->startdev : block->base; 2948 if (!device->blk_timeout) 2949 return BLK_EH_RESET_TIMER; 2950 DBF_DEV_EVENT(DBF_WARNING, device, 2951 " dasd_times_out cqr %p status %x", 2952 cqr, cqr->status); 2953 2954 spin_lock(&block->queue_lock); 2955 spin_lock(get_ccwdev_lock(device->cdev)); 2956 cqr->retries = -1; 2957 cqr->intrc = -ETIMEDOUT; 2958 if (cqr->status >= DASD_CQR_QUEUED) { 2959 spin_unlock(get_ccwdev_lock(device->cdev)); 2960 rc = dasd_cancel_req(cqr); 2961 } else if (cqr->status == DASD_CQR_FILLED || 2962 cqr->status == DASD_CQR_NEED_ERP) { 2963 cqr->status = DASD_CQR_TERMINATED; 2964 spin_unlock(get_ccwdev_lock(device->cdev)); 2965 } else if (cqr->status == DASD_CQR_IN_ERP) { 2966 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; 2967 2968 list_for_each_entry_safe(searchcqr, nextcqr, 2969 &block->ccw_queue, blocklist) { 2970 tmpcqr = searchcqr; 2971 while (tmpcqr->refers) 2972 tmpcqr = tmpcqr->refers; 2973 if (tmpcqr != cqr) 2974 continue; 2975 /* searchcqr is an ERP request for cqr */ 2976 searchcqr->retries = -1; 2977 searchcqr->intrc = -ETIMEDOUT; 2978 if (searchcqr->status >= DASD_CQR_QUEUED) { 2979 spin_unlock(get_ccwdev_lock(device->cdev)); 2980 rc = dasd_cancel_req(searchcqr); 2981 spin_lock(get_ccwdev_lock(device->cdev)); 2982 } else if ((searchcqr->status == DASD_CQR_FILLED) || 2983 (searchcqr->status == DASD_CQR_NEED_ERP)) { 2984 searchcqr->status = DASD_CQR_TERMINATED; 2985 rc = 0; 2986 } else if (searchcqr->status == DASD_CQR_IN_ERP) { 2987 /* 2988 * Shouldn't happen; most recent ERP 2989 * request is at the front of queue 2990 */ 2991 continue; 2992 } 2993 break; 2994 } 2995 spin_unlock(get_ccwdev_lock(device->cdev)); 2996 } 2997 dasd_schedule_block_bh(block); 2998 spin_unlock(&block->queue_lock); 2999 3000 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; 3001 } 3002 3003 /* 3004 * Allocate and initialize request queue and default I/O scheduler. 3005 */ 3006 static int dasd_alloc_queue(struct dasd_block *block) 3007 { 3008 block->request_queue = blk_init_queue(do_dasd_request, 3009 &block->request_queue_lock); 3010 if (block->request_queue == NULL) 3011 return -ENOMEM; 3012 3013 block->request_queue->queuedata = block; 3014 3015 return 0; 3016 } 3017 3018 /* 3019 * Allocate and initialize request queue. 3020 */ 3021 static void dasd_setup_queue(struct dasd_block *block) 3022 { 3023 int max; 3024 3025 if (block->base->features & DASD_FEATURE_USERAW) { 3026 /* 3027 * the max_blocks value for raw_track access is 256 3028 * it is higher than the native ECKD value because we 3029 * only need one ccw per track 3030 * so the max_hw_sectors are 3031 * 2048 x 512B = 1024kB = 16 tracks 3032 */ 3033 max = 2048; 3034 } else { 3035 max = block->base->discipline->max_blocks << block->s2b_shift; 3036 } 3037 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue); 3038 block->request_queue->limits.max_dev_sectors = max; 3039 blk_queue_logical_block_size(block->request_queue, 3040 block->bp_block); 3041 blk_queue_max_hw_sectors(block->request_queue, max); 3042 blk_queue_max_segments(block->request_queue, -1L); 3043 /* with page sized segments we can translate each segement into 3044 * one idaw/tidaw 3045 */ 3046 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); 3047 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); 3048 } 3049 3050 /* 3051 * Deactivate and free request queue. 3052 */ 3053 static void dasd_free_queue(struct dasd_block *block) 3054 { 3055 if (block->request_queue) { 3056 blk_cleanup_queue(block->request_queue); 3057 block->request_queue = NULL; 3058 } 3059 } 3060 3061 /* 3062 * Flush request on the request queue. 3063 */ 3064 static void dasd_flush_request_queue(struct dasd_block *block) 3065 { 3066 struct request *req; 3067 3068 if (!block->request_queue) 3069 return; 3070 3071 spin_lock_irq(&block->request_queue_lock); 3072 while ((req = blk_fetch_request(block->request_queue))) 3073 __blk_end_request_all(req, -EIO); 3074 spin_unlock_irq(&block->request_queue_lock); 3075 } 3076 3077 static int dasd_open(struct block_device *bdev, fmode_t mode) 3078 { 3079 struct dasd_device *base; 3080 int rc; 3081 3082 base = dasd_device_from_gendisk(bdev->bd_disk); 3083 if (!base) 3084 return -ENODEV; 3085 3086 atomic_inc(&base->block->open_count); 3087 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { 3088 rc = -ENODEV; 3089 goto unlock; 3090 } 3091 3092 if (!try_module_get(base->discipline->owner)) { 3093 rc = -EINVAL; 3094 goto unlock; 3095 } 3096 3097 if (dasd_probeonly) { 3098 dev_info(&base->cdev->dev, 3099 "Accessing the DASD failed because it is in " 3100 "probeonly mode\n"); 3101 rc = -EPERM; 3102 goto out; 3103 } 3104 3105 if (base->state <= DASD_STATE_BASIC) { 3106 DBF_DEV_EVENT(DBF_ERR, base, " %s", 3107 " Cannot open unrecognized device"); 3108 rc = -ENODEV; 3109 goto out; 3110 } 3111 3112 if ((mode & FMODE_WRITE) && 3113 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || 3114 (base->features & DASD_FEATURE_READONLY))) { 3115 rc = -EROFS; 3116 goto out; 3117 } 3118 3119 dasd_put_device(base); 3120 return 0; 3121 3122 out: 3123 module_put(base->discipline->owner); 3124 unlock: 3125 atomic_dec(&base->block->open_count); 3126 dasd_put_device(base); 3127 return rc; 3128 } 3129 3130 static void dasd_release(struct gendisk *disk, fmode_t mode) 3131 { 3132 struct dasd_device *base = dasd_device_from_gendisk(disk); 3133 if (base) { 3134 atomic_dec(&base->block->open_count); 3135 module_put(base->discipline->owner); 3136 dasd_put_device(base); 3137 } 3138 } 3139 3140 /* 3141 * Return disk geometry. 3142 */ 3143 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3144 { 3145 struct dasd_device *base; 3146 3147 base = dasd_device_from_gendisk(bdev->bd_disk); 3148 if (!base) 3149 return -ENODEV; 3150 3151 if (!base->discipline || 3152 !base->discipline->fill_geometry) { 3153 dasd_put_device(base); 3154 return -EINVAL; 3155 } 3156 base->discipline->fill_geometry(base->block, geo); 3157 geo->start = get_start_sect(bdev) >> base->block->s2b_shift; 3158 dasd_put_device(base); 3159 return 0; 3160 } 3161 3162 const struct block_device_operations 3163 dasd_device_operations = { 3164 .owner = THIS_MODULE, 3165 .open = dasd_open, 3166 .release = dasd_release, 3167 .ioctl = dasd_ioctl, 3168 .compat_ioctl = dasd_ioctl, 3169 .getgeo = dasd_getgeo, 3170 }; 3171 3172 /******************************************************************************* 3173 * end of block device operations 3174 */ 3175 3176 static void 3177 dasd_exit(void) 3178 { 3179 #ifdef CONFIG_PROC_FS 3180 dasd_proc_exit(); 3181 #endif 3182 dasd_eer_exit(); 3183 if (dasd_page_cache != NULL) { 3184 kmem_cache_destroy(dasd_page_cache); 3185 dasd_page_cache = NULL; 3186 } 3187 dasd_gendisk_exit(); 3188 dasd_devmap_exit(); 3189 if (dasd_debug_area != NULL) { 3190 debug_unregister(dasd_debug_area); 3191 dasd_debug_area = NULL; 3192 } 3193 dasd_statistics_removeroot(); 3194 } 3195 3196 /* 3197 * SECTION: common functions for ccw_driver use 3198 */ 3199 3200 /* 3201 * Is the device read-only? 3202 * Note that this function does not report the setting of the 3203 * readonly device attribute, but how it is configured in z/VM. 3204 */ 3205 int dasd_device_is_ro(struct dasd_device *device) 3206 { 3207 struct ccw_dev_id dev_id; 3208 struct diag210 diag_data; 3209 int rc; 3210 3211 if (!MACHINE_IS_VM) 3212 return 0; 3213 ccw_device_get_id(device->cdev, &dev_id); 3214 memset(&diag_data, 0, sizeof(diag_data)); 3215 diag_data.vrdcdvno = dev_id.devno; 3216 diag_data.vrdclen = sizeof(diag_data); 3217 rc = diag210(&diag_data); 3218 if (rc == 0 || rc == 2) { 3219 return diag_data.vrdcvfla & 0x80; 3220 } else { 3221 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", 3222 dev_id.devno, rc); 3223 return 0; 3224 } 3225 } 3226 EXPORT_SYMBOL_GPL(dasd_device_is_ro); 3227 3228 static void dasd_generic_auto_online(void *data, async_cookie_t cookie) 3229 { 3230 struct ccw_device *cdev = data; 3231 int ret; 3232 3233 ret = ccw_device_set_online(cdev); 3234 if (ret) 3235 pr_warn("%s: Setting the DASD online failed with rc=%d\n", 3236 dev_name(&cdev->dev), ret); 3237 } 3238 3239 /* 3240 * Initial attempt at a probe function. this can be simplified once 3241 * the other detection code is gone. 3242 */ 3243 int dasd_generic_probe(struct ccw_device *cdev, 3244 struct dasd_discipline *discipline) 3245 { 3246 int ret; 3247 3248 ret = dasd_add_sysfs_files(cdev); 3249 if (ret) { 3250 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", 3251 "dasd_generic_probe: could not add " 3252 "sysfs entries"); 3253 return ret; 3254 } 3255 cdev->handler = &dasd_int_handler; 3256 3257 /* 3258 * Automatically online either all dasd devices (dasd_autodetect) 3259 * or all devices specified with dasd= parameters during 3260 * initial probe. 3261 */ 3262 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || 3263 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) 3264 async_schedule(dasd_generic_auto_online, cdev); 3265 return 0; 3266 } 3267 EXPORT_SYMBOL_GPL(dasd_generic_probe); 3268 3269 /* 3270 * This will one day be called from a global not_oper handler. 3271 * It is also used by driver_unregister during module unload. 3272 */ 3273 void dasd_generic_remove(struct ccw_device *cdev) 3274 { 3275 struct dasd_device *device; 3276 struct dasd_block *block; 3277 3278 cdev->handler = NULL; 3279 3280 device = dasd_device_from_cdev(cdev); 3281 if (IS_ERR(device)) { 3282 dasd_remove_sysfs_files(cdev); 3283 return; 3284 } 3285 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && 3286 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3287 /* Already doing offline processing */ 3288 dasd_put_device(device); 3289 dasd_remove_sysfs_files(cdev); 3290 return; 3291 } 3292 /* 3293 * This device is removed unconditionally. Set offline 3294 * flag to prevent dasd_open from opening it while it is 3295 * no quite down yet. 3296 */ 3297 dasd_set_target_state(device, DASD_STATE_NEW); 3298 /* dasd_delete_device destroys the device reference. */ 3299 block = device->block; 3300 dasd_delete_device(device); 3301 /* 3302 * life cycle of block is bound to device, so delete it after 3303 * device was safely removed 3304 */ 3305 if (block) 3306 dasd_free_block(block); 3307 3308 dasd_remove_sysfs_files(cdev); 3309 } 3310 EXPORT_SYMBOL_GPL(dasd_generic_remove); 3311 3312 /* 3313 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either 3314 * the device is detected for the first time and is supposed to be used 3315 * or the user has started activation through sysfs. 3316 */ 3317 int dasd_generic_set_online(struct ccw_device *cdev, 3318 struct dasd_discipline *base_discipline) 3319 { 3320 struct dasd_discipline *discipline; 3321 struct dasd_device *device; 3322 int rc; 3323 3324 /* first online clears initial online feature flag */ 3325 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); 3326 device = dasd_create_device(cdev); 3327 if (IS_ERR(device)) 3328 return PTR_ERR(device); 3329 3330 discipline = base_discipline; 3331 if (device->features & DASD_FEATURE_USEDIAG) { 3332 if (!dasd_diag_discipline_pointer) { 3333 /* Try to load the required module. */ 3334 rc = request_module(DASD_DIAG_MOD); 3335 if (rc) { 3336 pr_warn("%s Setting the DASD online failed " 3337 "because the required module %s " 3338 "could not be loaded (rc=%d)\n", 3339 dev_name(&cdev->dev), DASD_DIAG_MOD, 3340 rc); 3341 dasd_delete_device(device); 3342 return -ENODEV; 3343 } 3344 } 3345 /* Module init could have failed, so check again here after 3346 * request_module(). */ 3347 if (!dasd_diag_discipline_pointer) { 3348 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n", 3349 dev_name(&cdev->dev)); 3350 dasd_delete_device(device); 3351 return -ENODEV; 3352 } 3353 discipline = dasd_diag_discipline_pointer; 3354 } 3355 if (!try_module_get(base_discipline->owner)) { 3356 dasd_delete_device(device); 3357 return -EINVAL; 3358 } 3359 if (!try_module_get(discipline->owner)) { 3360 module_put(base_discipline->owner); 3361 dasd_delete_device(device); 3362 return -EINVAL; 3363 } 3364 device->base_discipline = base_discipline; 3365 device->discipline = discipline; 3366 3367 /* check_device will allocate block device if necessary */ 3368 rc = discipline->check_device(device); 3369 if (rc) { 3370 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n", 3371 dev_name(&cdev->dev), discipline->name, rc); 3372 module_put(discipline->owner); 3373 module_put(base_discipline->owner); 3374 dasd_delete_device(device); 3375 return rc; 3376 } 3377 3378 dasd_set_target_state(device, DASD_STATE_ONLINE); 3379 if (device->state <= DASD_STATE_KNOWN) { 3380 pr_warn("%s Setting the DASD online failed because of a missing discipline\n", 3381 dev_name(&cdev->dev)); 3382 rc = -ENODEV; 3383 dasd_set_target_state(device, DASD_STATE_NEW); 3384 if (device->block) 3385 dasd_free_block(device->block); 3386 dasd_delete_device(device); 3387 } else 3388 pr_debug("dasd_generic device %s found\n", 3389 dev_name(&cdev->dev)); 3390 3391 wait_event(dasd_init_waitq, _wait_for_device(device)); 3392 3393 dasd_put_device(device); 3394 return rc; 3395 } 3396 EXPORT_SYMBOL_GPL(dasd_generic_set_online); 3397 3398 int dasd_generic_set_offline(struct ccw_device *cdev) 3399 { 3400 struct dasd_device *device; 3401 struct dasd_block *block; 3402 int max_count, open_count, rc; 3403 3404 rc = 0; 3405 device = dasd_device_from_cdev(cdev); 3406 if (IS_ERR(device)) 3407 return PTR_ERR(device); 3408 3409 /* 3410 * We must make sure that this device is currently not in use. 3411 * The open_count is increased for every opener, that includes 3412 * the blkdev_get in dasd_scan_partitions. We are only interested 3413 * in the other openers. 3414 */ 3415 if (device->block) { 3416 max_count = device->block->bdev ? 0 : -1; 3417 open_count = atomic_read(&device->block->open_count); 3418 if (open_count > max_count) { 3419 if (open_count > 0) 3420 pr_warn("%s: The DASD cannot be set offline with open count %i\n", 3421 dev_name(&cdev->dev), open_count); 3422 else 3423 pr_warn("%s: The DASD cannot be set offline while it is in use\n", 3424 dev_name(&cdev->dev)); 3425 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3426 dasd_put_device(device); 3427 return -EBUSY; 3428 } 3429 } 3430 3431 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3432 /* 3433 * safe offline already running 3434 * could only be called by normal offline so safe_offline flag 3435 * needs to be removed to run normal offline and kill all I/O 3436 */ 3437 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3438 /* Already doing normal offline processing */ 3439 dasd_put_device(device); 3440 return -EBUSY; 3441 } else 3442 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); 3443 3444 } else 3445 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3446 /* Already doing offline processing */ 3447 dasd_put_device(device); 3448 return -EBUSY; 3449 } 3450 3451 /* 3452 * if safe_offline called set safe_offline_running flag and 3453 * clear safe_offline so that a call to normal offline 3454 * can overrun safe_offline processing 3455 */ 3456 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && 3457 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3458 /* 3459 * If we want to set the device safe offline all IO operations 3460 * should be finished before continuing the offline process 3461 * so sync bdev first and then wait for our queues to become 3462 * empty 3463 */ 3464 /* sync blockdev and partitions */ 3465 rc = fsync_bdev(device->block->bdev); 3466 if (rc != 0) 3467 goto interrupted; 3468 3469 /* schedule device tasklet and wait for completion */ 3470 dasd_schedule_device_bh(device); 3471 rc = wait_event_interruptible(shutdown_waitq, 3472 _wait_for_empty_queues(device)); 3473 if (rc != 0) 3474 goto interrupted; 3475 } 3476 3477 set_bit(DASD_FLAG_OFFLINE, &device->flags); 3478 dasd_set_target_state(device, DASD_STATE_NEW); 3479 /* dasd_delete_device destroys the device reference. */ 3480 block = device->block; 3481 dasd_delete_device(device); 3482 /* 3483 * life cycle of block is bound to device, so delete it after 3484 * device was safely removed 3485 */ 3486 if (block) 3487 dasd_free_block(block); 3488 return 0; 3489 3490 interrupted: 3491 /* interrupted by signal */ 3492 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); 3493 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); 3494 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3495 dasd_put_device(device); 3496 return rc; 3497 } 3498 EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 3499 3500 int dasd_generic_last_path_gone(struct dasd_device *device) 3501 { 3502 struct dasd_ccw_req *cqr; 3503 3504 dev_warn(&device->cdev->dev, "No operational channel path is left " 3505 "for the device\n"); 3506 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); 3507 /* First of all call extended error reporting. */ 3508 dasd_eer_write(device, NULL, DASD_EER_NOPATH); 3509 3510 if (device->state < DASD_STATE_BASIC) 3511 return 0; 3512 /* Device is active. We want to keep it. */ 3513 list_for_each_entry(cqr, &device->ccw_queue, devlist) 3514 if ((cqr->status == DASD_CQR_IN_IO) || 3515 (cqr->status == DASD_CQR_CLEAR_PENDING)) { 3516 cqr->status = DASD_CQR_QUEUED; 3517 cqr->retries++; 3518 } 3519 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); 3520 dasd_device_clear_timer(device); 3521 dasd_schedule_device_bh(device); 3522 return 1; 3523 } 3524 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); 3525 3526 int dasd_generic_path_operational(struct dasd_device *device) 3527 { 3528 dev_info(&device->cdev->dev, "A channel path to the device has become " 3529 "operational\n"); 3530 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); 3531 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); 3532 if (device->stopped & DASD_UNRESUMED_PM) { 3533 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); 3534 dasd_restore_device(device); 3535 return 1; 3536 } 3537 dasd_schedule_device_bh(device); 3538 if (device->block) 3539 dasd_schedule_block_bh(device->block); 3540 3541 if (!device->stopped) 3542 wake_up(&generic_waitq); 3543 3544 return 1; 3545 } 3546 EXPORT_SYMBOL_GPL(dasd_generic_path_operational); 3547 3548 int dasd_generic_notify(struct ccw_device *cdev, int event) 3549 { 3550 struct dasd_device *device; 3551 int ret; 3552 3553 device = dasd_device_from_cdev_locked(cdev); 3554 if (IS_ERR(device)) 3555 return 0; 3556 ret = 0; 3557 switch (event) { 3558 case CIO_GONE: 3559 case CIO_BOXED: 3560 case CIO_NO_PATH: 3561 device->path_data.opm = 0; 3562 device->path_data.ppm = 0; 3563 device->path_data.npm = 0; 3564 ret = dasd_generic_last_path_gone(device); 3565 break; 3566 case CIO_OPER: 3567 ret = 1; 3568 if (device->path_data.opm) 3569 ret = dasd_generic_path_operational(device); 3570 break; 3571 } 3572 dasd_put_device(device); 3573 return ret; 3574 } 3575 EXPORT_SYMBOL_GPL(dasd_generic_notify); 3576 3577 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) 3578 { 3579 int chp; 3580 __u8 oldopm, eventlpm; 3581 struct dasd_device *device; 3582 3583 device = dasd_device_from_cdev_locked(cdev); 3584 if (IS_ERR(device)) 3585 return; 3586 for (chp = 0; chp < 8; chp++) { 3587 eventlpm = 0x80 >> chp; 3588 if (path_event[chp] & PE_PATH_GONE) { 3589 oldopm = device->path_data.opm; 3590 device->path_data.opm &= ~eventlpm; 3591 device->path_data.ppm &= ~eventlpm; 3592 device->path_data.npm &= ~eventlpm; 3593 if (oldopm && !device->path_data.opm) { 3594 dev_warn(&device->cdev->dev, 3595 "No verified channel paths remain " 3596 "for the device\n"); 3597 DBF_DEV_EVENT(DBF_WARNING, device, 3598 "%s", "last verified path gone"); 3599 dasd_eer_write(device, NULL, DASD_EER_NOPATH); 3600 dasd_device_set_stop_bits(device, 3601 DASD_STOPPED_DC_WAIT); 3602 } 3603 } 3604 if (path_event[chp] & PE_PATH_AVAILABLE) { 3605 device->path_data.opm &= ~eventlpm; 3606 device->path_data.ppm &= ~eventlpm; 3607 device->path_data.npm &= ~eventlpm; 3608 device->path_data.tbvpm |= eventlpm; 3609 dasd_schedule_device_bh(device); 3610 } 3611 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { 3612 if (!(device->path_data.opm & eventlpm) && 3613 !(device->path_data.tbvpm & eventlpm)) { 3614 /* 3615 * we can not establish a pathgroup on an 3616 * unavailable path, so trigger a path 3617 * verification first 3618 */ 3619 device->path_data.tbvpm |= eventlpm; 3620 dasd_schedule_device_bh(device); 3621 } 3622 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 3623 "Pathgroup re-established\n"); 3624 if (device->discipline->kick_validate) 3625 device->discipline->kick_validate(device); 3626 } 3627 } 3628 dasd_put_device(device); 3629 } 3630 EXPORT_SYMBOL_GPL(dasd_generic_path_event); 3631 3632 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) 3633 { 3634 if (!device->path_data.opm && lpm) { 3635 device->path_data.opm = lpm; 3636 dasd_generic_path_operational(device); 3637 } else 3638 device->path_data.opm |= lpm; 3639 return 0; 3640 } 3641 EXPORT_SYMBOL_GPL(dasd_generic_verify_path); 3642 3643 3644 int dasd_generic_pm_freeze(struct ccw_device *cdev) 3645 { 3646 struct dasd_device *device = dasd_device_from_cdev(cdev); 3647 struct list_head freeze_queue; 3648 struct dasd_ccw_req *cqr, *n; 3649 struct dasd_ccw_req *refers; 3650 int rc; 3651 3652 if (IS_ERR(device)) 3653 return PTR_ERR(device); 3654 3655 /* mark device as suspended */ 3656 set_bit(DASD_FLAG_SUSPENDED, &device->flags); 3657 3658 if (device->discipline->freeze) 3659 rc = device->discipline->freeze(device); 3660 3661 /* disallow new I/O */ 3662 dasd_device_set_stop_bits(device, DASD_STOPPED_PM); 3663 3664 /* clear active requests and requeue them to block layer if possible */ 3665 INIT_LIST_HEAD(&freeze_queue); 3666 spin_lock_irq(get_ccwdev_lock(cdev)); 3667 rc = 0; 3668 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 3669 /* Check status and move request to flush_queue */ 3670 if (cqr->status == DASD_CQR_IN_IO) { 3671 rc = device->discipline->term_IO(cqr); 3672 if (rc) { 3673 /* unable to terminate requeust */ 3674 dev_err(&device->cdev->dev, 3675 "Unable to terminate request %p " 3676 "on suspend\n", cqr); 3677 spin_unlock_irq(get_ccwdev_lock(cdev)); 3678 dasd_put_device(device); 3679 return rc; 3680 } 3681 } 3682 list_move_tail(&cqr->devlist, &freeze_queue); 3683 } 3684 spin_unlock_irq(get_ccwdev_lock(cdev)); 3685 3686 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { 3687 wait_event(dasd_flush_wq, 3688 (cqr->status != DASD_CQR_CLEAR_PENDING)); 3689 if (cqr->status == DASD_CQR_CLEARED) 3690 cqr->status = DASD_CQR_QUEUED; 3691 3692 /* requeue requests to blocklayer will only work for 3693 block device requests */ 3694 if (_dasd_requeue_request(cqr)) 3695 continue; 3696 3697 /* remove requests from device and block queue */ 3698 list_del_init(&cqr->devlist); 3699 while (cqr->refers != NULL) { 3700 refers = cqr->refers; 3701 /* remove the request from the block queue */ 3702 list_del(&cqr->blocklist); 3703 /* free the finished erp request */ 3704 dasd_free_erp_request(cqr, cqr->memdev); 3705 cqr = refers; 3706 } 3707 if (cqr->block) 3708 list_del_init(&cqr->blocklist); 3709 cqr->block->base->discipline->free_cp( 3710 cqr, (struct request *) cqr->callback_data); 3711 } 3712 3713 /* 3714 * if requests remain then they are internal request 3715 * and go back to the device queue 3716 */ 3717 if (!list_empty(&freeze_queue)) { 3718 /* move freeze_queue to start of the ccw_queue */ 3719 spin_lock_irq(get_ccwdev_lock(cdev)); 3720 list_splice_tail(&freeze_queue, &device->ccw_queue); 3721 spin_unlock_irq(get_ccwdev_lock(cdev)); 3722 } 3723 dasd_put_device(device); 3724 return rc; 3725 } 3726 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); 3727 3728 int dasd_generic_restore_device(struct ccw_device *cdev) 3729 { 3730 struct dasd_device *device = dasd_device_from_cdev(cdev); 3731 int rc = 0; 3732 3733 if (IS_ERR(device)) 3734 return PTR_ERR(device); 3735 3736 /* allow new IO again */ 3737 dasd_device_remove_stop_bits(device, 3738 (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); 3739 3740 dasd_schedule_device_bh(device); 3741 3742 /* 3743 * call discipline restore function 3744 * if device is stopped do nothing e.g. for disconnected devices 3745 */ 3746 if (device->discipline->restore && !(device->stopped)) 3747 rc = device->discipline->restore(device); 3748 if (rc || device->stopped) 3749 /* 3750 * if the resume failed for the DASD we put it in 3751 * an UNRESUMED stop state 3752 */ 3753 device->stopped |= DASD_UNRESUMED_PM; 3754 3755 if (device->block) 3756 dasd_schedule_block_bh(device->block); 3757 3758 clear_bit(DASD_FLAG_SUSPENDED, &device->flags); 3759 dasd_put_device(device); 3760 return 0; 3761 } 3762 EXPORT_SYMBOL_GPL(dasd_generic_restore_device); 3763 3764 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, 3765 void *rdc_buffer, 3766 int rdc_buffer_size, 3767 int magic) 3768 { 3769 struct dasd_ccw_req *cqr; 3770 struct ccw1 *ccw; 3771 unsigned long *idaw; 3772 3773 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); 3774 3775 if (IS_ERR(cqr)) { 3776 /* internal error 13 - Allocating the RDC request failed*/ 3777 dev_err(&device->cdev->dev, 3778 "An error occurred in the DASD device driver, " 3779 "reason=%s\n", "13"); 3780 return cqr; 3781 } 3782 3783 ccw = cqr->cpaddr; 3784 ccw->cmd_code = CCW_CMD_RDC; 3785 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { 3786 idaw = (unsigned long *) (cqr->data); 3787 ccw->cda = (__u32)(addr_t) idaw; 3788 ccw->flags = CCW_FLAG_IDA; 3789 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); 3790 } else { 3791 ccw->cda = (__u32)(addr_t) rdc_buffer; 3792 ccw->flags = 0; 3793 } 3794 3795 ccw->count = rdc_buffer_size; 3796 cqr->startdev = device; 3797 cqr->memdev = device; 3798 cqr->expires = 10*HZ; 3799 cqr->retries = 256; 3800 cqr->buildclk = get_tod_clock(); 3801 cqr->status = DASD_CQR_FILLED; 3802 return cqr; 3803 } 3804 3805 3806 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, 3807 void *rdc_buffer, int rdc_buffer_size) 3808 { 3809 int ret; 3810 struct dasd_ccw_req *cqr; 3811 3812 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, 3813 magic); 3814 if (IS_ERR(cqr)) 3815 return PTR_ERR(cqr); 3816 3817 ret = dasd_sleep_on(cqr); 3818 dasd_sfree_request(cqr, cqr->memdev); 3819 return ret; 3820 } 3821 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); 3822 3823 /* 3824 * In command mode and transport mode we need to look for sense 3825 * data in different places. The sense data itself is allways 3826 * an array of 32 bytes, so we can unify the sense data access 3827 * for both modes. 3828 */ 3829 char *dasd_get_sense(struct irb *irb) 3830 { 3831 struct tsb *tsb = NULL; 3832 char *sense = NULL; 3833 3834 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { 3835 if (irb->scsw.tm.tcw) 3836 tsb = tcw_get_tsb((struct tcw *)(unsigned long) 3837 irb->scsw.tm.tcw); 3838 if (tsb && tsb->length == 64 && tsb->flags) 3839 switch (tsb->flags & 0x07) { 3840 case 1: /* tsa_iostat */ 3841 sense = tsb->tsa.iostat.sense; 3842 break; 3843 case 2: /* tsa_ddpc */ 3844 sense = tsb->tsa.ddpc.sense; 3845 break; 3846 default: 3847 /* currently we don't use interrogate data */ 3848 break; 3849 } 3850 } else if (irb->esw.esw0.erw.cons) { 3851 sense = irb->ecw; 3852 } 3853 return sense; 3854 } 3855 EXPORT_SYMBOL_GPL(dasd_get_sense); 3856 3857 void dasd_generic_shutdown(struct ccw_device *cdev) 3858 { 3859 struct dasd_device *device; 3860 3861 device = dasd_device_from_cdev(cdev); 3862 if (IS_ERR(device)) 3863 return; 3864 3865 if (device->block) 3866 dasd_schedule_block_bh(device->block); 3867 3868 dasd_schedule_device_bh(device); 3869 3870 wait_event(shutdown_waitq, _wait_for_empty_queues(device)); 3871 } 3872 EXPORT_SYMBOL_GPL(dasd_generic_shutdown); 3873 3874 static int __init dasd_init(void) 3875 { 3876 int rc; 3877 3878 init_waitqueue_head(&dasd_init_waitq); 3879 init_waitqueue_head(&dasd_flush_wq); 3880 init_waitqueue_head(&generic_waitq); 3881 init_waitqueue_head(&shutdown_waitq); 3882 3883 /* register 'common' DASD debug area, used for all DBF_XXX calls */ 3884 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); 3885 if (dasd_debug_area == NULL) { 3886 rc = -ENOMEM; 3887 goto failed; 3888 } 3889 debug_register_view(dasd_debug_area, &debug_sprintf_view); 3890 debug_set_level(dasd_debug_area, DBF_WARNING); 3891 3892 DBF_EVENT(DBF_EMERG, "%s", "debug area created"); 3893 3894 dasd_diag_discipline_pointer = NULL; 3895 3896 dasd_statistics_createroot(); 3897 3898 rc = dasd_devmap_init(); 3899 if (rc) 3900 goto failed; 3901 rc = dasd_gendisk_init(); 3902 if (rc) 3903 goto failed; 3904 rc = dasd_parse(); 3905 if (rc) 3906 goto failed; 3907 rc = dasd_eer_init(); 3908 if (rc) 3909 goto failed; 3910 #ifdef CONFIG_PROC_FS 3911 rc = dasd_proc_init(); 3912 if (rc) 3913 goto failed; 3914 #endif 3915 3916 return 0; 3917 failed: 3918 pr_info("The DASD device driver could not be initialized\n"); 3919 dasd_exit(); 3920 return rc; 3921 } 3922 3923 module_init(dasd_init); 3924 module_exit(dasd_exit); 3925