1 /* 2 * File...........: linux/drivers/s390/block/dasd.c 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Carsten Otte <Cotte@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Bugreports.to..: <Linux390@de.ibm.com> 8 * Copyright IBM Corp. 1999, 2009 9 */ 10 11 #define KMSG_COMPONENT "dasd" 12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 13 14 #include <linux/kmod.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/ctype.h> 18 #include <linux/major.h> 19 #include <linux/slab.h> 20 #include <linux/hdreg.h> 21 #include <linux/async.h> 22 #include <linux/mutex.h> 23 #include <linux/debugfs.h> 24 #include <linux/seq_file.h> 25 #include <linux/vmalloc.h> 26 27 #include <asm/ccwdev.h> 28 #include <asm/ebcdic.h> 29 #include <asm/idals.h> 30 #include <asm/itcw.h> 31 #include <asm/diag.h> 32 33 /* This is ugly... */ 34 #define PRINTK_HEADER "dasd:" 35 36 #include "dasd_int.h" 37 /* 38 * SECTION: Constant definitions to be used within this file 39 */ 40 #define DASD_CHANQ_MAX_SIZE 4 41 42 #define DASD_SLEEPON_START_TAG (void *) 1 43 #define DASD_SLEEPON_END_TAG (void *) 2 44 45 /* 46 * SECTION: exported variables of dasd.c 47 */ 48 debug_info_t *dasd_debug_area; 49 static struct dentry *dasd_debugfs_root_entry; 50 struct dasd_discipline *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 2000 IBM Corporation"); 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 } 171 172 /* 173 * Free memory of a device structure. 174 */ 175 void dasd_free_block(struct dasd_block *block) 176 { 177 kfree(block); 178 } 179 180 /* 181 * Make a new device known to the system. 182 */ 183 static int dasd_state_new_to_known(struct dasd_device *device) 184 { 185 int rc; 186 187 /* 188 * As long as the device is not in state DASD_STATE_NEW we want to 189 * keep the reference count > 0. 190 */ 191 dasd_get_device(device); 192 193 if (device->block) { 194 rc = dasd_alloc_queue(device->block); 195 if (rc) { 196 dasd_put_device(device); 197 return rc; 198 } 199 } 200 device->state = DASD_STATE_KNOWN; 201 return 0; 202 } 203 204 /* 205 * Let the system forget about a device. 206 */ 207 static int dasd_state_known_to_new(struct dasd_device *device) 208 { 209 /* Disable extended error reporting for this device. */ 210 dasd_eer_disable(device); 211 /* Forget the discipline information. */ 212 if (device->discipline) { 213 if (device->discipline->uncheck_device) 214 device->discipline->uncheck_device(device); 215 module_put(device->discipline->owner); 216 } 217 device->discipline = NULL; 218 if (device->base_discipline) 219 module_put(device->base_discipline->owner); 220 device->base_discipline = NULL; 221 device->state = DASD_STATE_NEW; 222 223 if (device->block) 224 dasd_free_queue(device->block); 225 226 /* Give up reference we took in dasd_state_new_to_known. */ 227 dasd_put_device(device); 228 return 0; 229 } 230 231 static struct dentry *dasd_debugfs_setup(const char *name, 232 struct dentry *base_dentry) 233 { 234 struct dentry *pde; 235 236 if (!base_dentry) 237 return NULL; 238 pde = debugfs_create_dir(name, base_dentry); 239 if (!pde || IS_ERR(pde)) 240 return NULL; 241 return pde; 242 } 243 244 /* 245 * Request the irq line for the device. 246 */ 247 static int dasd_state_known_to_basic(struct dasd_device *device) 248 { 249 struct dasd_block *block = device->block; 250 int rc; 251 252 /* Allocate and register gendisk structure. */ 253 if (block) { 254 rc = dasd_gendisk_alloc(block); 255 if (rc) 256 return rc; 257 block->debugfs_dentry = 258 dasd_debugfs_setup(block->gdp->disk_name, 259 dasd_debugfs_root_entry); 260 dasd_profile_init(&block->profile, block->debugfs_dentry); 261 if (dasd_global_profile_level == DASD_PROFILE_ON) 262 dasd_profile_on(&device->block->profile); 263 } 264 device->debugfs_dentry = 265 dasd_debugfs_setup(dev_name(&device->cdev->dev), 266 dasd_debugfs_root_entry); 267 dasd_profile_init(&device->profile, device->debugfs_dentry); 268 269 /* register 'device' debug area, used for all DBF_DEV_XXX calls */ 270 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, 271 8 * sizeof(long)); 272 debug_register_view(device->debug_area, &debug_sprintf_view); 273 debug_set_level(device->debug_area, DBF_WARNING); 274 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); 275 276 device->state = DASD_STATE_BASIC; 277 return 0; 278 } 279 280 /* 281 * Release the irq line for the device. Terminate any running i/o. 282 */ 283 static int dasd_state_basic_to_known(struct dasd_device *device) 284 { 285 int rc; 286 if (device->block) { 287 dasd_profile_exit(&device->block->profile); 288 if (device->block->debugfs_dentry) 289 debugfs_remove(device->block->debugfs_dentry); 290 dasd_gendisk_free(device->block); 291 dasd_block_clear_timer(device->block); 292 } 293 rc = dasd_flush_device_queue(device); 294 if (rc) 295 return rc; 296 dasd_device_clear_timer(device); 297 dasd_profile_exit(&device->profile); 298 if (device->debugfs_dentry) 299 debugfs_remove(device->debugfs_dentry); 300 301 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); 302 if (device->debug_area != NULL) { 303 debug_unregister(device->debug_area); 304 device->debug_area = NULL; 305 } 306 device->state = DASD_STATE_KNOWN; 307 return 0; 308 } 309 310 /* 311 * Do the initial analysis. The do_analysis function may return 312 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC 313 * until the discipline decides to continue the startup sequence 314 * by calling the function dasd_change_state. The eckd disciplines 315 * uses this to start a ccw that detects the format. The completion 316 * interrupt for this detection ccw uses the kernel event daemon to 317 * trigger the call to dasd_change_state. All this is done in the 318 * discipline code, see dasd_eckd.c. 319 * After the analysis ccw is done (do_analysis returned 0) the block 320 * device is setup. 321 * In case the analysis returns an error, the device setup is stopped 322 * (a fake disk was already added to allow formatting). 323 */ 324 static int dasd_state_basic_to_ready(struct dasd_device *device) 325 { 326 int rc; 327 struct dasd_block *block; 328 329 rc = 0; 330 block = device->block; 331 /* make disk known with correct capacity */ 332 if (block) { 333 if (block->base->discipline->do_analysis != NULL) 334 rc = block->base->discipline->do_analysis(block); 335 if (rc) { 336 if (rc != -EAGAIN) 337 device->state = DASD_STATE_UNFMT; 338 return rc; 339 } 340 dasd_setup_queue(block); 341 set_capacity(block->gdp, 342 block->blocks << block->s2b_shift); 343 device->state = DASD_STATE_READY; 344 rc = dasd_scan_partitions(block); 345 if (rc) 346 device->state = DASD_STATE_BASIC; 347 } else { 348 device->state = DASD_STATE_READY; 349 } 350 return rc; 351 } 352 353 /* 354 * Remove device from block device layer. Destroy dirty buffers. 355 * Forget format information. Check if the target level is basic 356 * and if it is create fake disk for formatting. 357 */ 358 static int dasd_state_ready_to_basic(struct dasd_device *device) 359 { 360 int rc; 361 362 device->state = DASD_STATE_BASIC; 363 if (device->block) { 364 struct dasd_block *block = device->block; 365 rc = dasd_flush_block_queue(block); 366 if (rc) { 367 device->state = DASD_STATE_READY; 368 return rc; 369 } 370 dasd_flush_request_queue(block); 371 dasd_destroy_partitions(block); 372 block->blocks = 0; 373 block->bp_block = 0; 374 block->s2b_shift = 0; 375 } 376 return 0; 377 } 378 379 /* 380 * Back to basic. 381 */ 382 static int dasd_state_unfmt_to_basic(struct dasd_device *device) 383 { 384 device->state = DASD_STATE_BASIC; 385 return 0; 386 } 387 388 /* 389 * Make the device online and schedule the bottom half to start 390 * the requeueing of requests from the linux request queue to the 391 * ccw queue. 392 */ 393 static int 394 dasd_state_ready_to_online(struct dasd_device * device) 395 { 396 int rc; 397 struct gendisk *disk; 398 struct disk_part_iter piter; 399 struct hd_struct *part; 400 401 if (device->discipline->ready_to_online) { 402 rc = device->discipline->ready_to_online(device); 403 if (rc) 404 return rc; 405 } 406 device->state = DASD_STATE_ONLINE; 407 if (device->block) { 408 dasd_schedule_block_bh(device->block); 409 if ((device->features & DASD_FEATURE_USERAW)) { 410 disk = device->block->gdp; 411 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); 412 return 0; 413 } 414 disk = device->block->bdev->bd_disk; 415 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 416 while ((part = disk_part_iter_next(&piter))) 417 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 418 disk_part_iter_exit(&piter); 419 } 420 return 0; 421 } 422 423 /* 424 * Stop the requeueing of requests again. 425 */ 426 static int dasd_state_online_to_ready(struct dasd_device *device) 427 { 428 int rc; 429 struct gendisk *disk; 430 struct disk_part_iter piter; 431 struct hd_struct *part; 432 433 if (device->discipline->online_to_ready) { 434 rc = device->discipline->online_to_ready(device); 435 if (rc) 436 return rc; 437 } 438 device->state = DASD_STATE_READY; 439 if (device->block && !(device->features & DASD_FEATURE_USERAW)) { 440 disk = device->block->bdev->bd_disk; 441 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 442 while ((part = disk_part_iter_next(&piter))) 443 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 444 disk_part_iter_exit(&piter); 445 } 446 return 0; 447 } 448 449 /* 450 * Device startup state changes. 451 */ 452 static int dasd_increase_state(struct dasd_device *device) 453 { 454 int rc; 455 456 rc = 0; 457 if (device->state == DASD_STATE_NEW && 458 device->target >= DASD_STATE_KNOWN) 459 rc = dasd_state_new_to_known(device); 460 461 if (!rc && 462 device->state == DASD_STATE_KNOWN && 463 device->target >= DASD_STATE_BASIC) 464 rc = dasd_state_known_to_basic(device); 465 466 if (!rc && 467 device->state == DASD_STATE_BASIC && 468 device->target >= DASD_STATE_READY) 469 rc = dasd_state_basic_to_ready(device); 470 471 if (!rc && 472 device->state == DASD_STATE_UNFMT && 473 device->target > DASD_STATE_UNFMT) 474 rc = -EPERM; 475 476 if (!rc && 477 device->state == DASD_STATE_READY && 478 device->target >= DASD_STATE_ONLINE) 479 rc = dasd_state_ready_to_online(device); 480 481 return rc; 482 } 483 484 /* 485 * Device shutdown state changes. 486 */ 487 static int dasd_decrease_state(struct dasd_device *device) 488 { 489 int rc; 490 491 rc = 0; 492 if (device->state == DASD_STATE_ONLINE && 493 device->target <= DASD_STATE_READY) 494 rc = dasd_state_online_to_ready(device); 495 496 if (!rc && 497 device->state == DASD_STATE_READY && 498 device->target <= DASD_STATE_BASIC) 499 rc = dasd_state_ready_to_basic(device); 500 501 if (!rc && 502 device->state == DASD_STATE_UNFMT && 503 device->target <= DASD_STATE_BASIC) 504 rc = dasd_state_unfmt_to_basic(device); 505 506 if (!rc && 507 device->state == DASD_STATE_BASIC && 508 device->target <= DASD_STATE_KNOWN) 509 rc = dasd_state_basic_to_known(device); 510 511 if (!rc && 512 device->state == DASD_STATE_KNOWN && 513 device->target <= DASD_STATE_NEW) 514 rc = dasd_state_known_to_new(device); 515 516 return rc; 517 } 518 519 /* 520 * This is the main startup/shutdown routine. 521 */ 522 static void dasd_change_state(struct dasd_device *device) 523 { 524 int rc; 525 526 if (device->state == device->target) 527 /* Already where we want to go today... */ 528 return; 529 if (device->state < device->target) 530 rc = dasd_increase_state(device); 531 else 532 rc = dasd_decrease_state(device); 533 if (rc == -EAGAIN) 534 return; 535 if (rc) 536 device->target = device->state; 537 538 if (device->state == device->target) 539 wake_up(&dasd_init_waitq); 540 541 /* let user-space know that the device status changed */ 542 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); 543 } 544 545 /* 546 * Kick starter for devices that did not complete the startup/shutdown 547 * procedure or were sleeping because of a pending state. 548 * dasd_kick_device will schedule a call do do_kick_device to the kernel 549 * event daemon. 550 */ 551 static void do_kick_device(struct work_struct *work) 552 { 553 struct dasd_device *device = container_of(work, struct dasd_device, kick_work); 554 mutex_lock(&device->state_mutex); 555 dasd_change_state(device); 556 mutex_unlock(&device->state_mutex); 557 dasd_schedule_device_bh(device); 558 dasd_put_device(device); 559 } 560 561 void dasd_kick_device(struct dasd_device *device) 562 { 563 dasd_get_device(device); 564 /* queue call to dasd_kick_device to the kernel event daemon. */ 565 schedule_work(&device->kick_work); 566 } 567 568 /* 569 * dasd_reload_device will schedule a call do do_reload_device to the kernel 570 * event daemon. 571 */ 572 static void do_reload_device(struct work_struct *work) 573 { 574 struct dasd_device *device = container_of(work, struct dasd_device, 575 reload_device); 576 device->discipline->reload(device); 577 dasd_put_device(device); 578 } 579 580 void dasd_reload_device(struct dasd_device *device) 581 { 582 dasd_get_device(device); 583 /* queue call to dasd_reload_device to the kernel event daemon. */ 584 schedule_work(&device->reload_device); 585 } 586 EXPORT_SYMBOL(dasd_reload_device); 587 588 /* 589 * dasd_restore_device will schedule a call do do_restore_device to the kernel 590 * event daemon. 591 */ 592 static void do_restore_device(struct work_struct *work) 593 { 594 struct dasd_device *device = container_of(work, struct dasd_device, 595 restore_device); 596 device->cdev->drv->restore(device->cdev); 597 dasd_put_device(device); 598 } 599 600 void dasd_restore_device(struct dasd_device *device) 601 { 602 dasd_get_device(device); 603 /* queue call to dasd_restore_device to the kernel event daemon. */ 604 schedule_work(&device->restore_device); 605 } 606 607 /* 608 * Set the target state for a device and starts the state change. 609 */ 610 void dasd_set_target_state(struct dasd_device *device, int target) 611 { 612 dasd_get_device(device); 613 mutex_lock(&device->state_mutex); 614 /* If we are in probeonly mode stop at DASD_STATE_READY. */ 615 if (dasd_probeonly && target > DASD_STATE_READY) 616 target = DASD_STATE_READY; 617 if (device->target != target) { 618 if (device->state == target) 619 wake_up(&dasd_init_waitq); 620 device->target = target; 621 } 622 if (device->state != device->target) 623 dasd_change_state(device); 624 mutex_unlock(&device->state_mutex); 625 dasd_put_device(device); 626 } 627 628 /* 629 * Enable devices with device numbers in [from..to]. 630 */ 631 static inline int _wait_for_device(struct dasd_device *device) 632 { 633 return (device->state == device->target); 634 } 635 636 void dasd_enable_device(struct dasd_device *device) 637 { 638 dasd_set_target_state(device, DASD_STATE_ONLINE); 639 if (device->state <= DASD_STATE_KNOWN) 640 /* No discipline for device found. */ 641 dasd_set_target_state(device, DASD_STATE_NEW); 642 /* Now wait for the devices to come up. */ 643 wait_event(dasd_init_waitq, _wait_for_device(device)); 644 645 dasd_reload_device(device); 646 if (device->discipline->kick_validate) 647 device->discipline->kick_validate(device); 648 } 649 650 /* 651 * SECTION: device operation (interrupt handler, start i/o, term i/o ...) 652 */ 653 654 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; 655 656 #ifdef CONFIG_DASD_PROFILE 657 struct dasd_profile_info dasd_global_profile_data; 658 static struct dentry *dasd_global_profile_dentry; 659 static struct dentry *dasd_debugfs_global_entry; 660 661 /* 662 * Add profiling information for cqr before execution. 663 */ 664 static void dasd_profile_start(struct dasd_block *block, 665 struct dasd_ccw_req *cqr, 666 struct request *req) 667 { 668 struct list_head *l; 669 unsigned int counter; 670 struct dasd_device *device; 671 672 /* count the length of the chanq for statistics */ 673 counter = 0; 674 if (dasd_global_profile_level || block->profile.data) 675 list_for_each(l, &block->ccw_queue) 676 if (++counter >= 31) 677 break; 678 679 if (dasd_global_profile_level) { 680 dasd_global_profile_data.dasd_io_nr_req[counter]++; 681 if (rq_data_dir(req) == READ) 682 dasd_global_profile_data.dasd_read_nr_req[counter]++; 683 } 684 685 spin_lock(&block->profile.lock); 686 if (block->profile.data) 687 block->profile.data->dasd_io_nr_req[counter]++; 688 if (rq_data_dir(req) == READ) 689 block->profile.data->dasd_read_nr_req[counter]++; 690 spin_unlock(&block->profile.lock); 691 692 /* 693 * We count the request for the start device, even though it may run on 694 * some other device due to error recovery. This way we make sure that 695 * we count each request only once. 696 */ 697 device = cqr->startdev; 698 if (device->profile.data) { 699 counter = 1; /* request is not yet queued on the start device */ 700 list_for_each(l, &device->ccw_queue) 701 if (++counter >= 31) 702 break; 703 } 704 spin_lock(&device->profile.lock); 705 if (device->profile.data) { 706 device->profile.data->dasd_io_nr_req[counter]++; 707 if (rq_data_dir(req) == READ) 708 device->profile.data->dasd_read_nr_req[counter]++; 709 } 710 spin_unlock(&device->profile.lock); 711 } 712 713 /* 714 * Add profiling information for cqr after execution. 715 */ 716 717 #define dasd_profile_counter(value, index) \ 718 { \ 719 for (index = 0; index < 31 && value >> (2+index); index++) \ 720 ; \ 721 } 722 723 static void dasd_profile_end_add_data(struct dasd_profile_info *data, 724 int is_alias, 725 int is_tpm, 726 int is_read, 727 long sectors, 728 int sectors_ind, 729 int tottime_ind, 730 int tottimeps_ind, 731 int strtime_ind, 732 int irqtime_ind, 733 int irqtimeps_ind, 734 int endtime_ind) 735 { 736 /* in case of an overflow, reset the whole profile */ 737 if (data->dasd_io_reqs == UINT_MAX) { 738 memset(data, 0, sizeof(*data)); 739 getnstimeofday(&data->starttod); 740 } 741 data->dasd_io_reqs++; 742 data->dasd_io_sects += sectors; 743 if (is_alias) 744 data->dasd_io_alias++; 745 if (is_tpm) 746 data->dasd_io_tpm++; 747 748 data->dasd_io_secs[sectors_ind]++; 749 data->dasd_io_times[tottime_ind]++; 750 data->dasd_io_timps[tottimeps_ind]++; 751 data->dasd_io_time1[strtime_ind]++; 752 data->dasd_io_time2[irqtime_ind]++; 753 data->dasd_io_time2ps[irqtimeps_ind]++; 754 data->dasd_io_time3[endtime_ind]++; 755 756 if (is_read) { 757 data->dasd_read_reqs++; 758 data->dasd_read_sects += sectors; 759 if (is_alias) 760 data->dasd_read_alias++; 761 if (is_tpm) 762 data->dasd_read_tpm++; 763 data->dasd_read_secs[sectors_ind]++; 764 data->dasd_read_times[tottime_ind]++; 765 data->dasd_read_time1[strtime_ind]++; 766 data->dasd_read_time2[irqtime_ind]++; 767 data->dasd_read_time3[endtime_ind]++; 768 } 769 } 770 771 static void dasd_profile_end(struct dasd_block *block, 772 struct dasd_ccw_req *cqr, 773 struct request *req) 774 { 775 long strtime, irqtime, endtime, tottime; /* in microseconds */ 776 long tottimeps, sectors; 777 struct dasd_device *device; 778 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; 779 int irqtime_ind, irqtimeps_ind, endtime_ind; 780 781 device = cqr->startdev; 782 if (!(dasd_global_profile_level || 783 block->profile.data || 784 device->profile.data)) 785 return; 786 787 sectors = blk_rq_sectors(req); 788 if (!cqr->buildclk || !cqr->startclk || 789 !cqr->stopclk || !cqr->endclk || 790 !sectors) 791 return; 792 793 strtime = ((cqr->startclk - cqr->buildclk) >> 12); 794 irqtime = ((cqr->stopclk - cqr->startclk) >> 12); 795 endtime = ((cqr->endclk - cqr->stopclk) >> 12); 796 tottime = ((cqr->endclk - cqr->buildclk) >> 12); 797 tottimeps = tottime / sectors; 798 799 dasd_profile_counter(sectors, sectors_ind); 800 dasd_profile_counter(tottime, tottime_ind); 801 dasd_profile_counter(tottimeps, tottimeps_ind); 802 dasd_profile_counter(strtime, strtime_ind); 803 dasd_profile_counter(irqtime, irqtime_ind); 804 dasd_profile_counter(irqtime / sectors, irqtimeps_ind); 805 dasd_profile_counter(endtime, endtime_ind); 806 807 if (dasd_global_profile_level) { 808 dasd_profile_end_add_data(&dasd_global_profile_data, 809 cqr->startdev != block->base, 810 cqr->cpmode == 1, 811 rq_data_dir(req) == READ, 812 sectors, sectors_ind, tottime_ind, 813 tottimeps_ind, strtime_ind, 814 irqtime_ind, irqtimeps_ind, 815 endtime_ind); 816 } 817 818 spin_lock(&block->profile.lock); 819 if (block->profile.data) 820 dasd_profile_end_add_data(block->profile.data, 821 cqr->startdev != block->base, 822 cqr->cpmode == 1, 823 rq_data_dir(req) == READ, 824 sectors, sectors_ind, tottime_ind, 825 tottimeps_ind, strtime_ind, 826 irqtime_ind, irqtimeps_ind, 827 endtime_ind); 828 spin_unlock(&block->profile.lock); 829 830 spin_lock(&device->profile.lock); 831 if (device->profile.data) 832 dasd_profile_end_add_data(device->profile.data, 833 cqr->startdev != block->base, 834 cqr->cpmode == 1, 835 rq_data_dir(req) == READ, 836 sectors, sectors_ind, tottime_ind, 837 tottimeps_ind, strtime_ind, 838 irqtime_ind, irqtimeps_ind, 839 endtime_ind); 840 spin_unlock(&device->profile.lock); 841 } 842 843 void dasd_profile_reset(struct dasd_profile *profile) 844 { 845 struct dasd_profile_info *data; 846 847 spin_lock_bh(&profile->lock); 848 data = profile->data; 849 if (!data) { 850 spin_unlock_bh(&profile->lock); 851 return; 852 } 853 memset(data, 0, sizeof(*data)); 854 getnstimeofday(&data->starttod); 855 spin_unlock_bh(&profile->lock); 856 } 857 858 void dasd_global_profile_reset(void) 859 { 860 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data)); 861 getnstimeofday(&dasd_global_profile_data.starttod); 862 } 863 864 int dasd_profile_on(struct dasd_profile *profile) 865 { 866 struct dasd_profile_info *data; 867 868 data = kzalloc(sizeof(*data), GFP_KERNEL); 869 if (!data) 870 return -ENOMEM; 871 spin_lock_bh(&profile->lock); 872 if (profile->data) { 873 spin_unlock_bh(&profile->lock); 874 kfree(data); 875 return 0; 876 } 877 getnstimeofday(&data->starttod); 878 profile->data = data; 879 spin_unlock_bh(&profile->lock); 880 return 0; 881 } 882 883 void dasd_profile_off(struct dasd_profile *profile) 884 { 885 spin_lock_bh(&profile->lock); 886 kfree(profile->data); 887 profile->data = NULL; 888 spin_unlock_bh(&profile->lock); 889 } 890 891 char *dasd_get_user_string(const char __user *user_buf, size_t user_len) 892 { 893 char *buffer; 894 895 buffer = vmalloc(user_len + 1); 896 if (buffer == NULL) 897 return ERR_PTR(-ENOMEM); 898 if (copy_from_user(buffer, user_buf, user_len) != 0) { 899 vfree(buffer); 900 return ERR_PTR(-EFAULT); 901 } 902 /* got the string, now strip linefeed. */ 903 if (buffer[user_len - 1] == '\n') 904 buffer[user_len - 1] = 0; 905 else 906 buffer[user_len] = 0; 907 return buffer; 908 } 909 910 static ssize_t dasd_stats_write(struct file *file, 911 const char __user *user_buf, 912 size_t user_len, loff_t *pos) 913 { 914 char *buffer, *str; 915 int rc; 916 struct seq_file *m = (struct seq_file *)file->private_data; 917 struct dasd_profile *prof = m->private; 918 919 if (user_len > 65536) 920 user_len = 65536; 921 buffer = dasd_get_user_string(user_buf, user_len); 922 if (IS_ERR(buffer)) 923 return PTR_ERR(buffer); 924 925 str = skip_spaces(buffer); 926 rc = user_len; 927 if (strncmp(str, "reset", 5) == 0) { 928 dasd_profile_reset(prof); 929 } else if (strncmp(str, "on", 2) == 0) { 930 rc = dasd_profile_on(prof); 931 if (!rc) 932 rc = user_len; 933 } else if (strncmp(str, "off", 3) == 0) { 934 dasd_profile_off(prof); 935 } else 936 rc = -EINVAL; 937 vfree(buffer); 938 return rc; 939 } 940 941 static void dasd_stats_array(struct seq_file *m, unsigned int *array) 942 { 943 int i; 944 945 for (i = 0; i < 32; i++) 946 seq_printf(m, "%u ", array[i]); 947 seq_putc(m, '\n'); 948 } 949 950 static void dasd_stats_seq_print(struct seq_file *m, 951 struct dasd_profile_info *data) 952 { 953 seq_printf(m, "start_time %ld.%09ld\n", 954 data->starttod.tv_sec, data->starttod.tv_nsec); 955 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); 956 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); 957 seq_printf(m, "total_pav %u\n", data->dasd_io_alias); 958 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); 959 seq_printf(m, "histogram_sectors "); 960 dasd_stats_array(m, data->dasd_io_secs); 961 seq_printf(m, "histogram_io_times "); 962 dasd_stats_array(m, data->dasd_io_times); 963 seq_printf(m, "histogram_io_times_weighted "); 964 dasd_stats_array(m, data->dasd_io_timps); 965 seq_printf(m, "histogram_time_build_to_ssch "); 966 dasd_stats_array(m, data->dasd_io_time1); 967 seq_printf(m, "histogram_time_ssch_to_irq "); 968 dasd_stats_array(m, data->dasd_io_time2); 969 seq_printf(m, "histogram_time_ssch_to_irq_weighted "); 970 dasd_stats_array(m, data->dasd_io_time2ps); 971 seq_printf(m, "histogram_time_irq_to_end "); 972 dasd_stats_array(m, data->dasd_io_time3); 973 seq_printf(m, "histogram_ccw_queue_length "); 974 dasd_stats_array(m, data->dasd_io_nr_req); 975 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); 976 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); 977 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); 978 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); 979 seq_printf(m, "histogram_read_sectors "); 980 dasd_stats_array(m, data->dasd_read_secs); 981 seq_printf(m, "histogram_read_times "); 982 dasd_stats_array(m, data->dasd_read_times); 983 seq_printf(m, "histogram_read_time_build_to_ssch "); 984 dasd_stats_array(m, data->dasd_read_time1); 985 seq_printf(m, "histogram_read_time_ssch_to_irq "); 986 dasd_stats_array(m, data->dasd_read_time2); 987 seq_printf(m, "histogram_read_time_irq_to_end "); 988 dasd_stats_array(m, data->dasd_read_time3); 989 seq_printf(m, "histogram_read_ccw_queue_length "); 990 dasd_stats_array(m, data->dasd_read_nr_req); 991 } 992 993 static int dasd_stats_show(struct seq_file *m, void *v) 994 { 995 struct dasd_profile *profile; 996 struct dasd_profile_info *data; 997 998 profile = m->private; 999 spin_lock_bh(&profile->lock); 1000 data = profile->data; 1001 if (!data) { 1002 spin_unlock_bh(&profile->lock); 1003 seq_printf(m, "disabled\n"); 1004 return 0; 1005 } 1006 dasd_stats_seq_print(m, data); 1007 spin_unlock_bh(&profile->lock); 1008 return 0; 1009 } 1010 1011 static int dasd_stats_open(struct inode *inode, struct file *file) 1012 { 1013 struct dasd_profile *profile = inode->i_private; 1014 return single_open(file, dasd_stats_show, profile); 1015 } 1016 1017 static const struct file_operations dasd_stats_raw_fops = { 1018 .owner = THIS_MODULE, 1019 .open = dasd_stats_open, 1020 .read = seq_read, 1021 .llseek = seq_lseek, 1022 .release = single_release, 1023 .write = dasd_stats_write, 1024 }; 1025 1026 static ssize_t dasd_stats_global_write(struct file *file, 1027 const char __user *user_buf, 1028 size_t user_len, loff_t *pos) 1029 { 1030 char *buffer, *str; 1031 ssize_t rc; 1032 1033 if (user_len > 65536) 1034 user_len = 65536; 1035 buffer = dasd_get_user_string(user_buf, user_len); 1036 if (IS_ERR(buffer)) 1037 return PTR_ERR(buffer); 1038 str = skip_spaces(buffer); 1039 rc = user_len; 1040 if (strncmp(str, "reset", 5) == 0) { 1041 dasd_global_profile_reset(); 1042 } else if (strncmp(str, "on", 2) == 0) { 1043 dasd_global_profile_reset(); 1044 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; 1045 } else if (strncmp(str, "off", 3) == 0) { 1046 dasd_global_profile_level = DASD_PROFILE_OFF; 1047 } else 1048 rc = -EINVAL; 1049 vfree(buffer); 1050 return rc; 1051 } 1052 1053 static int dasd_stats_global_show(struct seq_file *m, void *v) 1054 { 1055 if (!dasd_global_profile_level) { 1056 seq_printf(m, "disabled\n"); 1057 return 0; 1058 } 1059 dasd_stats_seq_print(m, &dasd_global_profile_data); 1060 return 0; 1061 } 1062 1063 static int dasd_stats_global_open(struct inode *inode, struct file *file) 1064 { 1065 return single_open(file, dasd_stats_global_show, NULL); 1066 } 1067 1068 static const struct file_operations dasd_stats_global_fops = { 1069 .owner = THIS_MODULE, 1070 .open = dasd_stats_global_open, 1071 .read = seq_read, 1072 .llseek = seq_lseek, 1073 .release = single_release, 1074 .write = dasd_stats_global_write, 1075 }; 1076 1077 static void dasd_profile_init(struct dasd_profile *profile, 1078 struct dentry *base_dentry) 1079 { 1080 umode_t mode; 1081 struct dentry *pde; 1082 1083 if (!base_dentry) 1084 return; 1085 profile->dentry = NULL; 1086 profile->data = NULL; 1087 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1088 pde = debugfs_create_file("statistics", mode, base_dentry, 1089 profile, &dasd_stats_raw_fops); 1090 if (pde && !IS_ERR(pde)) 1091 profile->dentry = pde; 1092 return; 1093 } 1094 1095 static void dasd_profile_exit(struct dasd_profile *profile) 1096 { 1097 dasd_profile_off(profile); 1098 if (profile->dentry) { 1099 debugfs_remove(profile->dentry); 1100 profile->dentry = NULL; 1101 } 1102 } 1103 1104 static void dasd_statistics_removeroot(void) 1105 { 1106 dasd_global_profile_level = DASD_PROFILE_OFF; 1107 if (dasd_global_profile_dentry) { 1108 debugfs_remove(dasd_global_profile_dentry); 1109 dasd_global_profile_dentry = NULL; 1110 } 1111 if (dasd_debugfs_global_entry) 1112 debugfs_remove(dasd_debugfs_global_entry); 1113 if (dasd_debugfs_root_entry) 1114 debugfs_remove(dasd_debugfs_root_entry); 1115 } 1116 1117 static void dasd_statistics_createroot(void) 1118 { 1119 umode_t mode; 1120 struct dentry *pde; 1121 1122 dasd_debugfs_root_entry = NULL; 1123 dasd_debugfs_global_entry = NULL; 1124 dasd_global_profile_dentry = NULL; 1125 pde = debugfs_create_dir("dasd", NULL); 1126 if (!pde || IS_ERR(pde)) 1127 goto error; 1128 dasd_debugfs_root_entry = pde; 1129 pde = debugfs_create_dir("global", dasd_debugfs_root_entry); 1130 if (!pde || IS_ERR(pde)) 1131 goto error; 1132 dasd_debugfs_global_entry = pde; 1133 1134 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1135 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, 1136 NULL, &dasd_stats_global_fops); 1137 if (!pde || IS_ERR(pde)) 1138 goto error; 1139 dasd_global_profile_dentry = pde; 1140 return; 1141 1142 error: 1143 DBF_EVENT(DBF_ERR, "%s", 1144 "Creation of the dasd debugfs interface failed"); 1145 dasd_statistics_removeroot(); 1146 return; 1147 } 1148 1149 #else 1150 #define dasd_profile_start(block, cqr, req) do {} while (0) 1151 #define dasd_profile_end(block, cqr, req) do {} while (0) 1152 1153 static void dasd_statistics_createroot(void) 1154 { 1155 return; 1156 } 1157 1158 static void dasd_statistics_removeroot(void) 1159 { 1160 return; 1161 } 1162 1163 int dasd_stats_generic_show(struct seq_file *m, void *v) 1164 { 1165 seq_printf(m, "Statistics are not activated in this kernel\n"); 1166 return 0; 1167 } 1168 1169 static void dasd_profile_init(struct dasd_profile *profile, 1170 struct dentry *base_dentry) 1171 { 1172 return; 1173 } 1174 1175 static void dasd_profile_exit(struct dasd_profile *profile) 1176 { 1177 return; 1178 } 1179 1180 int dasd_profile_on(struct dasd_profile *profile) 1181 { 1182 return 0; 1183 } 1184 1185 #endif /* CONFIG_DASD_PROFILE */ 1186 1187 /* 1188 * Allocate memory for a channel program with 'cplength' channel 1189 * command words and 'datasize' additional space. There are two 1190 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed 1191 * memory and 2) dasd_smalloc_request uses the static ccw memory 1192 * that gets allocated for each device. 1193 */ 1194 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, 1195 int datasize, 1196 struct dasd_device *device) 1197 { 1198 struct dasd_ccw_req *cqr; 1199 1200 /* Sanity checks */ 1201 BUG_ON(datasize > PAGE_SIZE || 1202 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 1203 1204 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); 1205 if (cqr == NULL) 1206 return ERR_PTR(-ENOMEM); 1207 cqr->cpaddr = NULL; 1208 if (cplength > 0) { 1209 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), 1210 GFP_ATOMIC | GFP_DMA); 1211 if (cqr->cpaddr == NULL) { 1212 kfree(cqr); 1213 return ERR_PTR(-ENOMEM); 1214 } 1215 } 1216 cqr->data = NULL; 1217 if (datasize > 0) { 1218 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); 1219 if (cqr->data == NULL) { 1220 kfree(cqr->cpaddr); 1221 kfree(cqr); 1222 return ERR_PTR(-ENOMEM); 1223 } 1224 } 1225 cqr->magic = magic; 1226 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1227 dasd_get_device(device); 1228 return cqr; 1229 } 1230 1231 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, 1232 int datasize, 1233 struct dasd_device *device) 1234 { 1235 unsigned long flags; 1236 struct dasd_ccw_req *cqr; 1237 char *data; 1238 int size; 1239 1240 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 1241 if (cplength > 0) 1242 size += cplength * sizeof(struct ccw1); 1243 if (datasize > 0) 1244 size += datasize; 1245 spin_lock_irqsave(&device->mem_lock, flags); 1246 cqr = (struct dasd_ccw_req *) 1247 dasd_alloc_chunk(&device->ccw_chunks, size); 1248 spin_unlock_irqrestore(&device->mem_lock, flags); 1249 if (cqr == NULL) 1250 return ERR_PTR(-ENOMEM); 1251 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 1252 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 1253 cqr->cpaddr = NULL; 1254 if (cplength > 0) { 1255 cqr->cpaddr = (struct ccw1 *) data; 1256 data += cplength*sizeof(struct ccw1); 1257 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 1258 } 1259 cqr->data = NULL; 1260 if (datasize > 0) { 1261 cqr->data = data; 1262 memset(cqr->data, 0, datasize); 1263 } 1264 cqr->magic = magic; 1265 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1266 dasd_get_device(device); 1267 return cqr; 1268 } 1269 1270 /* 1271 * Free memory of a channel program. This function needs to free all the 1272 * idal lists that might have been created by dasd_set_cda and the 1273 * struct dasd_ccw_req itself. 1274 */ 1275 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1276 { 1277 #ifdef CONFIG_64BIT 1278 struct ccw1 *ccw; 1279 1280 /* Clear any idals used for the request. */ 1281 ccw = cqr->cpaddr; 1282 do { 1283 clear_normalized_cda(ccw); 1284 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); 1285 #endif 1286 kfree(cqr->cpaddr); 1287 kfree(cqr->data); 1288 kfree(cqr); 1289 dasd_put_device(device); 1290 } 1291 1292 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1293 { 1294 unsigned long flags; 1295 1296 spin_lock_irqsave(&device->mem_lock, flags); 1297 dasd_free_chunk(&device->ccw_chunks, cqr); 1298 spin_unlock_irqrestore(&device->mem_lock, flags); 1299 dasd_put_device(device); 1300 } 1301 1302 /* 1303 * Check discipline magic in cqr. 1304 */ 1305 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) 1306 { 1307 struct dasd_device *device; 1308 1309 if (cqr == NULL) 1310 return -EINVAL; 1311 device = cqr->startdev; 1312 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { 1313 DBF_DEV_EVENT(DBF_WARNING, device, 1314 " dasd_ccw_req 0x%08x magic doesn't match" 1315 " discipline 0x%08x", 1316 cqr->magic, 1317 *(unsigned int *) device->discipline->name); 1318 return -EINVAL; 1319 } 1320 return 0; 1321 } 1322 1323 /* 1324 * Terminate the current i/o and set the request to clear_pending. 1325 * Timer keeps device runnig. 1326 * ccw_device_clear can fail if the i/o subsystem 1327 * is in a bad mood. 1328 */ 1329 int dasd_term_IO(struct dasd_ccw_req *cqr) 1330 { 1331 struct dasd_device *device; 1332 int retries, rc; 1333 char errorstring[ERRORLENGTH]; 1334 1335 /* Check the cqr */ 1336 rc = dasd_check_cqr(cqr); 1337 if (rc) 1338 return rc; 1339 retries = 0; 1340 device = (struct dasd_device *) cqr->startdev; 1341 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { 1342 rc = ccw_device_clear(device->cdev, (long) cqr); 1343 switch (rc) { 1344 case 0: /* termination successful */ 1345 cqr->status = DASD_CQR_CLEAR_PENDING; 1346 cqr->stopclk = get_clock(); 1347 cqr->starttime = 0; 1348 DBF_DEV_EVENT(DBF_DEBUG, device, 1349 "terminate cqr %p successful", 1350 cqr); 1351 break; 1352 case -ENODEV: 1353 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1354 "device gone, retry"); 1355 break; 1356 case -EIO: 1357 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1358 "I/O error, retry"); 1359 break; 1360 case -EINVAL: 1361 case -EBUSY: 1362 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1363 "device busy, retry later"); 1364 break; 1365 default: 1366 /* internal error 10 - unknown rc*/ 1367 snprintf(errorstring, ERRORLENGTH, "10 %d", rc); 1368 dev_err(&device->cdev->dev, "An error occurred in the " 1369 "DASD device driver, reason=%s\n", errorstring); 1370 BUG(); 1371 break; 1372 } 1373 retries++; 1374 } 1375 dasd_schedule_device_bh(device); 1376 return rc; 1377 } 1378 1379 /* 1380 * Start the i/o. This start_IO can fail if the channel is really busy. 1381 * In that case set up a timer to start the request later. 1382 */ 1383 int dasd_start_IO(struct dasd_ccw_req *cqr) 1384 { 1385 struct dasd_device *device; 1386 int rc; 1387 char errorstring[ERRORLENGTH]; 1388 1389 /* Check the cqr */ 1390 rc = dasd_check_cqr(cqr); 1391 if (rc) { 1392 cqr->intrc = rc; 1393 return rc; 1394 } 1395 device = (struct dasd_device *) cqr->startdev; 1396 if (((cqr->block && 1397 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || 1398 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && 1399 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 1400 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " 1401 "because of stolen lock", cqr); 1402 cqr->status = DASD_CQR_ERROR; 1403 cqr->intrc = -EPERM; 1404 return -EPERM; 1405 } 1406 if (cqr->retries < 0) { 1407 /* internal error 14 - start_IO run out of retries */ 1408 sprintf(errorstring, "14 %p", cqr); 1409 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1410 "device driver, reason=%s\n", errorstring); 1411 cqr->status = DASD_CQR_ERROR; 1412 return -EIO; 1413 } 1414 cqr->startclk = get_clock(); 1415 cqr->starttime = jiffies; 1416 cqr->retries--; 1417 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1418 cqr->lpm &= device->path_data.opm; 1419 if (!cqr->lpm) 1420 cqr->lpm = device->path_data.opm; 1421 } 1422 if (cqr->cpmode == 1) { 1423 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, 1424 (long) cqr, cqr->lpm); 1425 } else { 1426 rc = ccw_device_start(device->cdev, cqr->cpaddr, 1427 (long) cqr, cqr->lpm, 0); 1428 } 1429 switch (rc) { 1430 case 0: 1431 cqr->status = DASD_CQR_IN_IO; 1432 break; 1433 case -EBUSY: 1434 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1435 "start_IO: device busy, retry later"); 1436 break; 1437 case -ETIMEDOUT: 1438 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1439 "start_IO: request timeout, retry later"); 1440 break; 1441 case -EACCES: 1442 /* -EACCES indicates that the request used only a subset of the 1443 * available paths and all these paths are gone. If the lpm of 1444 * this request was only a subset of the opm (e.g. the ppm) then 1445 * we just do a retry with all available paths. 1446 * If we already use the full opm, something is amiss, and we 1447 * need a full path verification. 1448 */ 1449 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1450 DBF_DEV_EVENT(DBF_WARNING, device, 1451 "start_IO: selected paths gone (%x)", 1452 cqr->lpm); 1453 } else if (cqr->lpm != device->path_data.opm) { 1454 cqr->lpm = device->path_data.opm; 1455 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 1456 "start_IO: selected paths gone," 1457 " retry on all paths"); 1458 } else { 1459 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1460 "start_IO: all paths in opm gone," 1461 " do path verification"); 1462 dasd_generic_last_path_gone(device); 1463 device->path_data.opm = 0; 1464 device->path_data.ppm = 0; 1465 device->path_data.npm = 0; 1466 device->path_data.tbvpm = 1467 ccw_device_get_path_mask(device->cdev); 1468 } 1469 break; 1470 case -ENODEV: 1471 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1472 "start_IO: -ENODEV device gone, retry"); 1473 break; 1474 case -EIO: 1475 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1476 "start_IO: -EIO device gone, retry"); 1477 break; 1478 case -EINVAL: 1479 /* most likely caused in power management context */ 1480 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1481 "start_IO: -EINVAL device currently " 1482 "not accessible"); 1483 break; 1484 default: 1485 /* internal error 11 - unknown rc */ 1486 snprintf(errorstring, ERRORLENGTH, "11 %d", rc); 1487 dev_err(&device->cdev->dev, 1488 "An error occurred in the DASD device driver, " 1489 "reason=%s\n", errorstring); 1490 BUG(); 1491 break; 1492 } 1493 cqr->intrc = rc; 1494 return rc; 1495 } 1496 1497 /* 1498 * Timeout function for dasd devices. This is used for different purposes 1499 * 1) missing interrupt handler for normal operation 1500 * 2) delayed start of request where start_IO failed with -EBUSY 1501 * 3) timeout for missing state change interrupts 1502 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), 1503 * DASD_CQR_QUEUED for 2) and 3). 1504 */ 1505 static void dasd_device_timeout(unsigned long ptr) 1506 { 1507 unsigned long flags; 1508 struct dasd_device *device; 1509 1510 device = (struct dasd_device *) ptr; 1511 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 1512 /* re-activate request queue */ 1513 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1514 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 1515 dasd_schedule_device_bh(device); 1516 } 1517 1518 /* 1519 * Setup timeout for a device in jiffies. 1520 */ 1521 void dasd_device_set_timer(struct dasd_device *device, int expires) 1522 { 1523 if (expires == 0) 1524 del_timer(&device->timer); 1525 else 1526 mod_timer(&device->timer, jiffies + expires); 1527 } 1528 1529 /* 1530 * Clear timeout for a device. 1531 */ 1532 void dasd_device_clear_timer(struct dasd_device *device) 1533 { 1534 del_timer(&device->timer); 1535 } 1536 1537 static void dasd_handle_killed_request(struct ccw_device *cdev, 1538 unsigned long intparm) 1539 { 1540 struct dasd_ccw_req *cqr; 1541 struct dasd_device *device; 1542 1543 if (!intparm) 1544 return; 1545 cqr = (struct dasd_ccw_req *) intparm; 1546 if (cqr->status != DASD_CQR_IN_IO) { 1547 DBF_EVENT_DEVID(DBF_DEBUG, cdev, 1548 "invalid status in handle_killed_request: " 1549 "%02x", cqr->status); 1550 return; 1551 } 1552 1553 device = dasd_device_from_cdev_locked(cdev); 1554 if (IS_ERR(device)) { 1555 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1556 "unable to get device from cdev"); 1557 return; 1558 } 1559 1560 if (!cqr->startdev || 1561 device != cqr->startdev || 1562 strncmp(cqr->startdev->discipline->ebcname, 1563 (char *) &cqr->magic, 4)) { 1564 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1565 "invalid device in request"); 1566 dasd_put_device(device); 1567 return; 1568 } 1569 1570 /* Schedule request to be retried. */ 1571 cqr->status = DASD_CQR_QUEUED; 1572 1573 dasd_device_clear_timer(device); 1574 dasd_schedule_device_bh(device); 1575 dasd_put_device(device); 1576 } 1577 1578 void dasd_generic_handle_state_change(struct dasd_device *device) 1579 { 1580 /* First of all start sense subsystem status request. */ 1581 dasd_eer_snss(device); 1582 1583 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1584 dasd_schedule_device_bh(device); 1585 if (device->block) 1586 dasd_schedule_block_bh(device->block); 1587 } 1588 1589 /* 1590 * Interrupt handler for "normal" ssch-io based dasd devices. 1591 */ 1592 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 1593 struct irb *irb) 1594 { 1595 struct dasd_ccw_req *cqr, *next; 1596 struct dasd_device *device; 1597 unsigned long long now; 1598 int expires; 1599 1600 if (IS_ERR(irb)) { 1601 switch (PTR_ERR(irb)) { 1602 case -EIO: 1603 break; 1604 case -ETIMEDOUT: 1605 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1606 "request timed out\n", __func__); 1607 break; 1608 default: 1609 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1610 "unknown error %ld\n", __func__, 1611 PTR_ERR(irb)); 1612 } 1613 dasd_handle_killed_request(cdev, intparm); 1614 return; 1615 } 1616 1617 now = get_clock(); 1618 cqr = (struct dasd_ccw_req *) intparm; 1619 /* check for conditions that should be handled immediately */ 1620 if (!cqr || 1621 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1622 scsw_cstat(&irb->scsw) == 0)) { 1623 if (cqr) 1624 memcpy(&cqr->irb, irb, sizeof(*irb)); 1625 device = dasd_device_from_cdev_locked(cdev); 1626 if (IS_ERR(device)) 1627 return; 1628 /* ignore unsolicited interrupts for DIAG discipline */ 1629 if (device->discipline == dasd_diag_discipline_pointer) { 1630 dasd_put_device(device); 1631 return; 1632 } 1633 device->discipline->dump_sense_dbf(device, irb, "int"); 1634 if (device->features & DASD_FEATURE_ERPLOG) 1635 device->discipline->dump_sense(device, cqr, irb); 1636 device->discipline->check_for_device_change(device, cqr, irb); 1637 dasd_put_device(device); 1638 } 1639 if (!cqr) 1640 return; 1641 1642 device = (struct dasd_device *) cqr->startdev; 1643 if (!device || 1644 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 1645 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1646 "invalid device in request"); 1647 return; 1648 } 1649 1650 /* Check for clear pending */ 1651 if (cqr->status == DASD_CQR_CLEAR_PENDING && 1652 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { 1653 cqr->status = DASD_CQR_CLEARED; 1654 dasd_device_clear_timer(device); 1655 wake_up(&dasd_flush_wq); 1656 dasd_schedule_device_bh(device); 1657 return; 1658 } 1659 1660 /* check status - the request might have been killed by dyn detach */ 1661 if (cqr->status != DASD_CQR_IN_IO) { 1662 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " 1663 "status %02x", dev_name(&cdev->dev), cqr->status); 1664 return; 1665 } 1666 1667 next = NULL; 1668 expires = 0; 1669 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1670 scsw_cstat(&irb->scsw) == 0) { 1671 /* request was completed successfully */ 1672 cqr->status = DASD_CQR_SUCCESS; 1673 cqr->stopclk = now; 1674 /* Start first request on queue if possible -> fast_io. */ 1675 if (cqr->devlist.next != &device->ccw_queue) { 1676 next = list_entry(cqr->devlist.next, 1677 struct dasd_ccw_req, devlist); 1678 } 1679 } else { /* error */ 1680 /* 1681 * If we don't want complex ERP for this request, then just 1682 * reset this and retry it in the fastpath 1683 */ 1684 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && 1685 cqr->retries > 0) { 1686 if (cqr->lpm == device->path_data.opm) 1687 DBF_DEV_EVENT(DBF_DEBUG, device, 1688 "default ERP in fastpath " 1689 "(%i retries left)", 1690 cqr->retries); 1691 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 1692 cqr->lpm = device->path_data.opm; 1693 cqr->status = DASD_CQR_QUEUED; 1694 next = cqr; 1695 } else 1696 cqr->status = DASD_CQR_ERROR; 1697 } 1698 if (next && (next->status == DASD_CQR_QUEUED) && 1699 (!device->stopped)) { 1700 if (device->discipline->start_IO(next) == 0) 1701 expires = next->expires; 1702 } 1703 if (expires != 0) 1704 dasd_device_set_timer(device, expires); 1705 else 1706 dasd_device_clear_timer(device); 1707 dasd_schedule_device_bh(device); 1708 } 1709 1710 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) 1711 { 1712 struct dasd_device *device; 1713 1714 device = dasd_device_from_cdev_locked(cdev); 1715 1716 if (IS_ERR(device)) 1717 goto out; 1718 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1719 device->state != device->target || 1720 !device->discipline->check_for_device_change){ 1721 dasd_put_device(device); 1722 goto out; 1723 } 1724 if (device->discipline->dump_sense_dbf) 1725 device->discipline->dump_sense_dbf(device, irb, "uc"); 1726 device->discipline->check_for_device_change(device, NULL, irb); 1727 dasd_put_device(device); 1728 out: 1729 return UC_TODO_RETRY; 1730 } 1731 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); 1732 1733 /* 1734 * If we have an error on a dasd_block layer request then we cancel 1735 * and return all further requests from the same dasd_block as well. 1736 */ 1737 static void __dasd_device_recovery(struct dasd_device *device, 1738 struct dasd_ccw_req *ref_cqr) 1739 { 1740 struct list_head *l, *n; 1741 struct dasd_ccw_req *cqr; 1742 1743 /* 1744 * only requeue request that came from the dasd_block layer 1745 */ 1746 if (!ref_cqr->block) 1747 return; 1748 1749 list_for_each_safe(l, n, &device->ccw_queue) { 1750 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1751 if (cqr->status == DASD_CQR_QUEUED && 1752 ref_cqr->block == cqr->block) { 1753 cqr->status = DASD_CQR_CLEARED; 1754 } 1755 } 1756 }; 1757 1758 /* 1759 * Remove those ccw requests from the queue that need to be returned 1760 * to the upper layer. 1761 */ 1762 static void __dasd_device_process_ccw_queue(struct dasd_device *device, 1763 struct list_head *final_queue) 1764 { 1765 struct list_head *l, *n; 1766 struct dasd_ccw_req *cqr; 1767 1768 /* Process request with final status. */ 1769 list_for_each_safe(l, n, &device->ccw_queue) { 1770 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1771 1772 /* Stop list processing at the first non-final request. */ 1773 if (cqr->status == DASD_CQR_QUEUED || 1774 cqr->status == DASD_CQR_IN_IO || 1775 cqr->status == DASD_CQR_CLEAR_PENDING) 1776 break; 1777 if (cqr->status == DASD_CQR_ERROR) { 1778 __dasd_device_recovery(device, cqr); 1779 } 1780 /* Rechain finished requests to final queue */ 1781 list_move_tail(&cqr->devlist, final_queue); 1782 } 1783 } 1784 1785 /* 1786 * the cqrs from the final queue are returned to the upper layer 1787 * by setting a dasd_block state and calling the callback function 1788 */ 1789 static void __dasd_device_process_final_queue(struct dasd_device *device, 1790 struct list_head *final_queue) 1791 { 1792 struct list_head *l, *n; 1793 struct dasd_ccw_req *cqr; 1794 struct dasd_block *block; 1795 void (*callback)(struct dasd_ccw_req *, void *data); 1796 void *callback_data; 1797 char errorstring[ERRORLENGTH]; 1798 1799 list_for_each_safe(l, n, final_queue) { 1800 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1801 list_del_init(&cqr->devlist); 1802 block = cqr->block; 1803 callback = cqr->callback; 1804 callback_data = cqr->callback_data; 1805 if (block) 1806 spin_lock_bh(&block->queue_lock); 1807 switch (cqr->status) { 1808 case DASD_CQR_SUCCESS: 1809 cqr->status = DASD_CQR_DONE; 1810 break; 1811 case DASD_CQR_ERROR: 1812 cqr->status = DASD_CQR_NEED_ERP; 1813 break; 1814 case DASD_CQR_CLEARED: 1815 cqr->status = DASD_CQR_TERMINATED; 1816 break; 1817 default: 1818 /* internal error 12 - wrong cqr status*/ 1819 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); 1820 dev_err(&device->cdev->dev, 1821 "An error occurred in the DASD device driver, " 1822 "reason=%s\n", errorstring); 1823 BUG(); 1824 } 1825 if (cqr->callback != NULL) 1826 (callback)(cqr, callback_data); 1827 if (block) 1828 spin_unlock_bh(&block->queue_lock); 1829 } 1830 } 1831 1832 /* 1833 * Take a look at the first request on the ccw queue and check 1834 * if it reached its expire time. If so, terminate the IO. 1835 */ 1836 static void __dasd_device_check_expire(struct dasd_device *device) 1837 { 1838 struct dasd_ccw_req *cqr; 1839 1840 if (list_empty(&device->ccw_queue)) 1841 return; 1842 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1843 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && 1844 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { 1845 if (device->discipline->term_IO(cqr) != 0) { 1846 /* Hmpf, try again in 5 sec */ 1847 dev_err(&device->cdev->dev, 1848 "cqr %p timed out (%lus) but cannot be " 1849 "ended, retrying in 5 s\n", 1850 cqr, (cqr->expires/HZ)); 1851 cqr->expires += 5*HZ; 1852 dasd_device_set_timer(device, 5*HZ); 1853 } else { 1854 dev_err(&device->cdev->dev, 1855 "cqr %p timed out (%lus), %i retries " 1856 "remaining\n", cqr, (cqr->expires/HZ), 1857 cqr->retries); 1858 } 1859 } 1860 } 1861 1862 /* 1863 * Take a look at the first request on the ccw queue and check 1864 * if it needs to be started. 1865 */ 1866 static void __dasd_device_start_head(struct dasd_device *device) 1867 { 1868 struct dasd_ccw_req *cqr; 1869 int rc; 1870 1871 if (list_empty(&device->ccw_queue)) 1872 return; 1873 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1874 if (cqr->status != DASD_CQR_QUEUED) 1875 return; 1876 /* when device is stopped, return request to previous layer 1877 * exception: only the disconnect or unresumed bits are set and the 1878 * cqr is a path verification request 1879 */ 1880 if (device->stopped && 1881 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) 1882 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { 1883 cqr->intrc = -EAGAIN; 1884 cqr->status = DASD_CQR_CLEARED; 1885 dasd_schedule_device_bh(device); 1886 return; 1887 } 1888 1889 rc = device->discipline->start_IO(cqr); 1890 if (rc == 0) 1891 dasd_device_set_timer(device, cqr->expires); 1892 else if (rc == -EACCES) { 1893 dasd_schedule_device_bh(device); 1894 } else 1895 /* Hmpf, try again in 1/2 sec */ 1896 dasd_device_set_timer(device, 50); 1897 } 1898 1899 static void __dasd_device_check_path_events(struct dasd_device *device) 1900 { 1901 int rc; 1902 1903 if (device->path_data.tbvpm) { 1904 if (device->stopped & ~(DASD_STOPPED_DC_WAIT | 1905 DASD_UNRESUMED_PM)) 1906 return; 1907 rc = device->discipline->verify_path( 1908 device, device->path_data.tbvpm); 1909 if (rc) 1910 dasd_device_set_timer(device, 50); 1911 else 1912 device->path_data.tbvpm = 0; 1913 } 1914 }; 1915 1916 /* 1917 * Go through all request on the dasd_device request queue, 1918 * terminate them on the cdev if necessary, and return them to the 1919 * submitting layer via callback. 1920 * Note: 1921 * Make sure that all 'submitting layers' still exist when 1922 * this function is called!. In other words, when 'device' is a base 1923 * device then all block layer requests must have been removed before 1924 * via dasd_flush_block_queue. 1925 */ 1926 int dasd_flush_device_queue(struct dasd_device *device) 1927 { 1928 struct dasd_ccw_req *cqr, *n; 1929 int rc; 1930 struct list_head flush_queue; 1931 1932 INIT_LIST_HEAD(&flush_queue); 1933 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1934 rc = 0; 1935 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 1936 /* Check status and move request to flush_queue */ 1937 switch (cqr->status) { 1938 case DASD_CQR_IN_IO: 1939 rc = device->discipline->term_IO(cqr); 1940 if (rc) { 1941 /* unable to terminate requeust */ 1942 dev_err(&device->cdev->dev, 1943 "Flushing the DASD request queue " 1944 "failed for request %p\n", cqr); 1945 /* stop flush processing */ 1946 goto finished; 1947 } 1948 break; 1949 case DASD_CQR_QUEUED: 1950 cqr->stopclk = get_clock(); 1951 cqr->status = DASD_CQR_CLEARED; 1952 break; 1953 default: /* no need to modify the others */ 1954 break; 1955 } 1956 list_move_tail(&cqr->devlist, &flush_queue); 1957 } 1958 finished: 1959 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1960 /* 1961 * After this point all requests must be in state CLEAR_PENDING, 1962 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become 1963 * one of the others. 1964 */ 1965 list_for_each_entry_safe(cqr, n, &flush_queue, devlist) 1966 wait_event(dasd_flush_wq, 1967 (cqr->status != DASD_CQR_CLEAR_PENDING)); 1968 /* 1969 * Now set each request back to TERMINATED, DONE or NEED_ERP 1970 * and call the callback function of flushed requests 1971 */ 1972 __dasd_device_process_final_queue(device, &flush_queue); 1973 return rc; 1974 } 1975 1976 /* 1977 * Acquire the device lock and process queues for the device. 1978 */ 1979 static void dasd_device_tasklet(struct dasd_device *device) 1980 { 1981 struct list_head final_queue; 1982 1983 atomic_set (&device->tasklet_scheduled, 0); 1984 INIT_LIST_HEAD(&final_queue); 1985 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1986 /* Check expire time of first request on the ccw queue. */ 1987 __dasd_device_check_expire(device); 1988 /* find final requests on ccw queue */ 1989 __dasd_device_process_ccw_queue(device, &final_queue); 1990 __dasd_device_check_path_events(device); 1991 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1992 /* Now call the callback function of requests with final status */ 1993 __dasd_device_process_final_queue(device, &final_queue); 1994 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1995 /* Now check if the head of the ccw queue needs to be started. */ 1996 __dasd_device_start_head(device); 1997 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1998 if (waitqueue_active(&shutdown_waitq)) 1999 wake_up(&shutdown_waitq); 2000 dasd_put_device(device); 2001 } 2002 2003 /* 2004 * Schedules a call to dasd_tasklet over the device tasklet. 2005 */ 2006 void dasd_schedule_device_bh(struct dasd_device *device) 2007 { 2008 /* Protect against rescheduling. */ 2009 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) 2010 return; 2011 dasd_get_device(device); 2012 tasklet_hi_schedule(&device->tasklet); 2013 } 2014 2015 void dasd_device_set_stop_bits(struct dasd_device *device, int bits) 2016 { 2017 device->stopped |= bits; 2018 } 2019 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); 2020 2021 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) 2022 { 2023 device->stopped &= ~bits; 2024 if (!device->stopped) 2025 wake_up(&generic_waitq); 2026 } 2027 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); 2028 2029 /* 2030 * Queue a request to the head of the device ccw_queue. 2031 * Start the I/O if possible. 2032 */ 2033 void dasd_add_request_head(struct dasd_ccw_req *cqr) 2034 { 2035 struct dasd_device *device; 2036 unsigned long flags; 2037 2038 device = cqr->startdev; 2039 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2040 cqr->status = DASD_CQR_QUEUED; 2041 list_add(&cqr->devlist, &device->ccw_queue); 2042 /* let the bh start the request to keep them in order */ 2043 dasd_schedule_device_bh(device); 2044 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2045 } 2046 2047 /* 2048 * Queue a request to the tail of the device ccw_queue. 2049 * Start the I/O if possible. 2050 */ 2051 void dasd_add_request_tail(struct dasd_ccw_req *cqr) 2052 { 2053 struct dasd_device *device; 2054 unsigned long flags; 2055 2056 device = cqr->startdev; 2057 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2058 cqr->status = DASD_CQR_QUEUED; 2059 list_add_tail(&cqr->devlist, &device->ccw_queue); 2060 /* let the bh start the request to keep them in order */ 2061 dasd_schedule_device_bh(device); 2062 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2063 } 2064 2065 /* 2066 * Wakeup helper for the 'sleep_on' functions. 2067 */ 2068 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) 2069 { 2070 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2071 cqr->callback_data = DASD_SLEEPON_END_TAG; 2072 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2073 wake_up(&generic_waitq); 2074 } 2075 EXPORT_SYMBOL_GPL(dasd_wakeup_cb); 2076 2077 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) 2078 { 2079 struct dasd_device *device; 2080 int rc; 2081 2082 device = cqr->startdev; 2083 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2084 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); 2085 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2086 return rc; 2087 } 2088 2089 /* 2090 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. 2091 */ 2092 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) 2093 { 2094 struct dasd_device *device; 2095 dasd_erp_fn_t erp_fn; 2096 2097 if (cqr->status == DASD_CQR_FILLED) 2098 return 0; 2099 device = cqr->startdev; 2100 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2101 if (cqr->status == DASD_CQR_TERMINATED) { 2102 device->discipline->handle_terminated_request(cqr); 2103 return 1; 2104 } 2105 if (cqr->status == DASD_CQR_NEED_ERP) { 2106 erp_fn = device->discipline->erp_action(cqr); 2107 erp_fn(cqr); 2108 return 1; 2109 } 2110 if (cqr->status == DASD_CQR_FAILED) 2111 dasd_log_sense(cqr, &cqr->irb); 2112 if (cqr->refers) { 2113 __dasd_process_erp(device, cqr); 2114 return 1; 2115 } 2116 } 2117 return 0; 2118 } 2119 2120 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) 2121 { 2122 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2123 if (cqr->refers) /* erp is not done yet */ 2124 return 1; 2125 return ((cqr->status != DASD_CQR_DONE) && 2126 (cqr->status != DASD_CQR_FAILED)); 2127 } else 2128 return (cqr->status == DASD_CQR_FILLED); 2129 } 2130 2131 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) 2132 { 2133 struct dasd_device *device; 2134 int rc; 2135 struct list_head ccw_queue; 2136 struct dasd_ccw_req *cqr; 2137 2138 INIT_LIST_HEAD(&ccw_queue); 2139 maincqr->status = DASD_CQR_FILLED; 2140 device = maincqr->startdev; 2141 list_add(&maincqr->blocklist, &ccw_queue); 2142 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); 2143 cqr = list_first_entry(&ccw_queue, 2144 struct dasd_ccw_req, blocklist)) { 2145 2146 if (__dasd_sleep_on_erp(cqr)) 2147 continue; 2148 if (cqr->status != DASD_CQR_FILLED) /* could be failed */ 2149 continue; 2150 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2151 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2152 cqr->status = DASD_CQR_FAILED; 2153 cqr->intrc = -EPERM; 2154 continue; 2155 } 2156 /* Non-temporary stop condition will trigger fail fast */ 2157 if (device->stopped & ~DASD_STOPPED_PENDING && 2158 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2159 (!dasd_eer_enabled(device))) { 2160 cqr->status = DASD_CQR_FAILED; 2161 continue; 2162 } 2163 /* Don't try to start requests if device is stopped */ 2164 if (interruptible) { 2165 rc = wait_event_interruptible( 2166 generic_waitq, !(device->stopped)); 2167 if (rc == -ERESTARTSYS) { 2168 cqr->status = DASD_CQR_FAILED; 2169 maincqr->intrc = rc; 2170 continue; 2171 } 2172 } else 2173 wait_event(generic_waitq, !(device->stopped)); 2174 2175 if (!cqr->callback) 2176 cqr->callback = dasd_wakeup_cb; 2177 2178 cqr->callback_data = DASD_SLEEPON_START_TAG; 2179 dasd_add_request_tail(cqr); 2180 if (interruptible) { 2181 rc = wait_event_interruptible( 2182 generic_waitq, _wait_for_wakeup(cqr)); 2183 if (rc == -ERESTARTSYS) { 2184 dasd_cancel_req(cqr); 2185 /* wait (non-interruptible) for final status */ 2186 wait_event(generic_waitq, 2187 _wait_for_wakeup(cqr)); 2188 cqr->status = DASD_CQR_FAILED; 2189 maincqr->intrc = rc; 2190 continue; 2191 } 2192 } else 2193 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2194 } 2195 2196 maincqr->endclk = get_clock(); 2197 if ((maincqr->status != DASD_CQR_DONE) && 2198 (maincqr->intrc != -ERESTARTSYS)) 2199 dasd_log_sense(maincqr, &maincqr->irb); 2200 if (maincqr->status == DASD_CQR_DONE) 2201 rc = 0; 2202 else if (maincqr->intrc) 2203 rc = maincqr->intrc; 2204 else 2205 rc = -EIO; 2206 return rc; 2207 } 2208 2209 /* 2210 * Queue a request to the tail of the device ccw_queue and wait for 2211 * it's completion. 2212 */ 2213 int dasd_sleep_on(struct dasd_ccw_req *cqr) 2214 { 2215 return _dasd_sleep_on(cqr, 0); 2216 } 2217 2218 /* 2219 * Queue a request to the tail of the device ccw_queue and wait 2220 * interruptible for it's completion. 2221 */ 2222 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) 2223 { 2224 return _dasd_sleep_on(cqr, 1); 2225 } 2226 2227 /* 2228 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock 2229 * for eckd devices) the currently running request has to be terminated 2230 * and be put back to status queued, before the special request is added 2231 * to the head of the queue. Then the special request is waited on normally. 2232 */ 2233 static inline int _dasd_term_running_cqr(struct dasd_device *device) 2234 { 2235 struct dasd_ccw_req *cqr; 2236 int rc; 2237 2238 if (list_empty(&device->ccw_queue)) 2239 return 0; 2240 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2241 rc = device->discipline->term_IO(cqr); 2242 if (!rc) 2243 /* 2244 * CQR terminated because a more important request is pending. 2245 * Undo decreasing of retry counter because this is 2246 * not an error case. 2247 */ 2248 cqr->retries++; 2249 return rc; 2250 } 2251 2252 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) 2253 { 2254 struct dasd_device *device; 2255 int rc; 2256 2257 device = cqr->startdev; 2258 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2259 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2260 cqr->status = DASD_CQR_FAILED; 2261 cqr->intrc = -EPERM; 2262 return -EIO; 2263 } 2264 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2265 rc = _dasd_term_running_cqr(device); 2266 if (rc) { 2267 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2268 return rc; 2269 } 2270 cqr->callback = dasd_wakeup_cb; 2271 cqr->callback_data = DASD_SLEEPON_START_TAG; 2272 cqr->status = DASD_CQR_QUEUED; 2273 /* 2274 * add new request as second 2275 * first the terminated cqr needs to be finished 2276 */ 2277 list_add(&cqr->devlist, device->ccw_queue.next); 2278 2279 /* let the bh start the request to keep them in order */ 2280 dasd_schedule_device_bh(device); 2281 2282 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2283 2284 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2285 2286 if (cqr->status == DASD_CQR_DONE) 2287 rc = 0; 2288 else if (cqr->intrc) 2289 rc = cqr->intrc; 2290 else 2291 rc = -EIO; 2292 return rc; 2293 } 2294 2295 /* 2296 * Cancels a request that was started with dasd_sleep_on_req. 2297 * This is useful to timeout requests. The request will be 2298 * terminated if it is currently in i/o. 2299 * Returns 1 if the request has been terminated. 2300 * 0 if there was no need to terminate the request (not started yet) 2301 * negative error code if termination failed 2302 * Cancellation of a request is an asynchronous operation! The calling 2303 * function has to wait until the request is properly returned via callback. 2304 */ 2305 int dasd_cancel_req(struct dasd_ccw_req *cqr) 2306 { 2307 struct dasd_device *device = cqr->startdev; 2308 unsigned long flags; 2309 int rc; 2310 2311 rc = 0; 2312 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2313 switch (cqr->status) { 2314 case DASD_CQR_QUEUED: 2315 /* request was not started - just set to cleared */ 2316 cqr->status = DASD_CQR_CLEARED; 2317 break; 2318 case DASD_CQR_IN_IO: 2319 /* request in IO - terminate IO and release again */ 2320 rc = device->discipline->term_IO(cqr); 2321 if (rc) { 2322 dev_err(&device->cdev->dev, 2323 "Cancelling request %p failed with rc=%d\n", 2324 cqr, rc); 2325 } else { 2326 cqr->stopclk = get_clock(); 2327 } 2328 break; 2329 default: /* already finished or clear pending - do nothing */ 2330 break; 2331 } 2332 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2333 dasd_schedule_device_bh(device); 2334 return rc; 2335 } 2336 2337 2338 /* 2339 * SECTION: Operations of the dasd_block layer. 2340 */ 2341 2342 /* 2343 * Timeout function for dasd_block. This is used when the block layer 2344 * is waiting for something that may not come reliably, (e.g. a state 2345 * change interrupt) 2346 */ 2347 static void dasd_block_timeout(unsigned long ptr) 2348 { 2349 unsigned long flags; 2350 struct dasd_block *block; 2351 2352 block = (struct dasd_block *) ptr; 2353 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); 2354 /* re-activate request queue */ 2355 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); 2356 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); 2357 dasd_schedule_block_bh(block); 2358 } 2359 2360 /* 2361 * Setup timeout for a dasd_block in jiffies. 2362 */ 2363 void dasd_block_set_timer(struct dasd_block *block, int expires) 2364 { 2365 if (expires == 0) 2366 del_timer(&block->timer); 2367 else 2368 mod_timer(&block->timer, jiffies + expires); 2369 } 2370 2371 /* 2372 * Clear timeout for a dasd_block. 2373 */ 2374 void dasd_block_clear_timer(struct dasd_block *block) 2375 { 2376 del_timer(&block->timer); 2377 } 2378 2379 /* 2380 * Process finished error recovery ccw. 2381 */ 2382 static void __dasd_process_erp(struct dasd_device *device, 2383 struct dasd_ccw_req *cqr) 2384 { 2385 dasd_erp_fn_t erp_fn; 2386 2387 if (cqr->status == DASD_CQR_DONE) 2388 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); 2389 else 2390 dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); 2391 erp_fn = device->discipline->erp_postaction(cqr); 2392 erp_fn(cqr); 2393 } 2394 2395 /* 2396 * Fetch requests from the block device queue. 2397 */ 2398 static void __dasd_process_request_queue(struct dasd_block *block) 2399 { 2400 struct request_queue *queue; 2401 struct request *req; 2402 struct dasd_ccw_req *cqr; 2403 struct dasd_device *basedev; 2404 unsigned long flags; 2405 queue = block->request_queue; 2406 basedev = block->base; 2407 /* No queue ? Then there is nothing to do. */ 2408 if (queue == NULL) 2409 return; 2410 2411 /* 2412 * We requeue request from the block device queue to the ccw 2413 * queue only in two states. In state DASD_STATE_READY the 2414 * partition detection is done and we need to requeue requests 2415 * for that. State DASD_STATE_ONLINE is normal block device 2416 * operation. 2417 */ 2418 if (basedev->state < DASD_STATE_READY) { 2419 while ((req = blk_fetch_request(block->request_queue))) 2420 __blk_end_request_all(req, -EIO); 2421 return; 2422 } 2423 /* Now we try to fetch requests from the request queue */ 2424 while ((req = blk_peek_request(queue))) { 2425 if (basedev->features & DASD_FEATURE_READONLY && 2426 rq_data_dir(req) == WRITE) { 2427 DBF_DEV_EVENT(DBF_ERR, basedev, 2428 "Rejecting write request %p", 2429 req); 2430 blk_start_request(req); 2431 __blk_end_request_all(req, -EIO); 2432 continue; 2433 } 2434 cqr = basedev->discipline->build_cp(basedev, block, req); 2435 if (IS_ERR(cqr)) { 2436 if (PTR_ERR(cqr) == -EBUSY) 2437 break; /* normal end condition */ 2438 if (PTR_ERR(cqr) == -ENOMEM) 2439 break; /* terminate request queue loop */ 2440 if (PTR_ERR(cqr) == -EAGAIN) { 2441 /* 2442 * The current request cannot be build right 2443 * now, we have to try later. If this request 2444 * is the head-of-queue we stop the device 2445 * for 1/2 second. 2446 */ 2447 if (!list_empty(&block->ccw_queue)) 2448 break; 2449 spin_lock_irqsave( 2450 get_ccwdev_lock(basedev->cdev), flags); 2451 dasd_device_set_stop_bits(basedev, 2452 DASD_STOPPED_PENDING); 2453 spin_unlock_irqrestore( 2454 get_ccwdev_lock(basedev->cdev), flags); 2455 dasd_block_set_timer(block, HZ/2); 2456 break; 2457 } 2458 DBF_DEV_EVENT(DBF_ERR, basedev, 2459 "CCW creation failed (rc=%ld) " 2460 "on request %p", 2461 PTR_ERR(cqr), req); 2462 blk_start_request(req); 2463 __blk_end_request_all(req, -EIO); 2464 continue; 2465 } 2466 /* 2467 * Note: callback is set to dasd_return_cqr_cb in 2468 * __dasd_block_start_head to cover erp requests as well 2469 */ 2470 cqr->callback_data = (void *) req; 2471 cqr->status = DASD_CQR_FILLED; 2472 blk_start_request(req); 2473 list_add_tail(&cqr->blocklist, &block->ccw_queue); 2474 dasd_profile_start(block, cqr, req); 2475 } 2476 } 2477 2478 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) 2479 { 2480 struct request *req; 2481 int status; 2482 int error = 0; 2483 2484 req = (struct request *) cqr->callback_data; 2485 dasd_profile_end(cqr->block, cqr, req); 2486 status = cqr->block->base->discipline->free_cp(cqr, req); 2487 if (status <= 0) 2488 error = status ? status : -EIO; 2489 __blk_end_request_all(req, error); 2490 } 2491 2492 /* 2493 * Process ccw request queue. 2494 */ 2495 static void __dasd_process_block_ccw_queue(struct dasd_block *block, 2496 struct list_head *final_queue) 2497 { 2498 struct list_head *l, *n; 2499 struct dasd_ccw_req *cqr; 2500 dasd_erp_fn_t erp_fn; 2501 unsigned long flags; 2502 struct dasd_device *base = block->base; 2503 2504 restart: 2505 /* Process request with final status. */ 2506 list_for_each_safe(l, n, &block->ccw_queue) { 2507 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2508 if (cqr->status != DASD_CQR_DONE && 2509 cqr->status != DASD_CQR_FAILED && 2510 cqr->status != DASD_CQR_NEED_ERP && 2511 cqr->status != DASD_CQR_TERMINATED) 2512 continue; 2513 2514 if (cqr->status == DASD_CQR_TERMINATED) { 2515 base->discipline->handle_terminated_request(cqr); 2516 goto restart; 2517 } 2518 2519 /* Process requests that may be recovered */ 2520 if (cqr->status == DASD_CQR_NEED_ERP) { 2521 erp_fn = base->discipline->erp_action(cqr); 2522 if (IS_ERR(erp_fn(cqr))) 2523 continue; 2524 goto restart; 2525 } 2526 2527 /* log sense for fatal error */ 2528 if (cqr->status == DASD_CQR_FAILED) { 2529 dasd_log_sense(cqr, &cqr->irb); 2530 } 2531 2532 /* First of all call extended error reporting. */ 2533 if (dasd_eer_enabled(base) && 2534 cqr->status == DASD_CQR_FAILED) { 2535 dasd_eer_write(base, cqr, DASD_EER_FATALERROR); 2536 2537 /* restart request */ 2538 cqr->status = DASD_CQR_FILLED; 2539 cqr->retries = 255; 2540 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 2541 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 2542 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 2543 flags); 2544 goto restart; 2545 } 2546 2547 /* Process finished ERP request. */ 2548 if (cqr->refers) { 2549 __dasd_process_erp(base, cqr); 2550 goto restart; 2551 } 2552 2553 /* Rechain finished requests to final queue */ 2554 cqr->endclk = get_clock(); 2555 list_move_tail(&cqr->blocklist, final_queue); 2556 } 2557 } 2558 2559 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) 2560 { 2561 dasd_schedule_block_bh(cqr->block); 2562 } 2563 2564 static void __dasd_block_start_head(struct dasd_block *block) 2565 { 2566 struct dasd_ccw_req *cqr; 2567 2568 if (list_empty(&block->ccw_queue)) 2569 return; 2570 /* We allways begin with the first requests on the queue, as some 2571 * of previously started requests have to be enqueued on a 2572 * dasd_device again for error recovery. 2573 */ 2574 list_for_each_entry(cqr, &block->ccw_queue, blocklist) { 2575 if (cqr->status != DASD_CQR_FILLED) 2576 continue; 2577 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && 2578 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2579 cqr->status = DASD_CQR_FAILED; 2580 cqr->intrc = -EPERM; 2581 dasd_schedule_block_bh(block); 2582 continue; 2583 } 2584 /* Non-temporary stop condition will trigger fail fast */ 2585 if (block->base->stopped & ~DASD_STOPPED_PENDING && 2586 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2587 (!dasd_eer_enabled(block->base))) { 2588 cqr->status = DASD_CQR_FAILED; 2589 dasd_schedule_block_bh(block); 2590 continue; 2591 } 2592 /* Don't try to start requests if device is stopped */ 2593 if (block->base->stopped) 2594 return; 2595 2596 /* just a fail safe check, should not happen */ 2597 if (!cqr->startdev) 2598 cqr->startdev = block->base; 2599 2600 /* make sure that the requests we submit find their way back */ 2601 cqr->callback = dasd_return_cqr_cb; 2602 2603 dasd_add_request_tail(cqr); 2604 } 2605 } 2606 2607 /* 2608 * Central dasd_block layer routine. Takes requests from the generic 2609 * block layer request queue, creates ccw requests, enqueues them on 2610 * a dasd_device and processes ccw requests that have been returned. 2611 */ 2612 static void dasd_block_tasklet(struct dasd_block *block) 2613 { 2614 struct list_head final_queue; 2615 struct list_head *l, *n; 2616 struct dasd_ccw_req *cqr; 2617 2618 atomic_set(&block->tasklet_scheduled, 0); 2619 INIT_LIST_HEAD(&final_queue); 2620 spin_lock(&block->queue_lock); 2621 /* Finish off requests on ccw queue */ 2622 __dasd_process_block_ccw_queue(block, &final_queue); 2623 spin_unlock(&block->queue_lock); 2624 /* Now call the callback function of requests with final status */ 2625 spin_lock_irq(&block->request_queue_lock); 2626 list_for_each_safe(l, n, &final_queue) { 2627 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2628 list_del_init(&cqr->blocklist); 2629 __dasd_cleanup_cqr(cqr); 2630 } 2631 spin_lock(&block->queue_lock); 2632 /* Get new request from the block device request queue */ 2633 __dasd_process_request_queue(block); 2634 /* Now check if the head of the ccw queue needs to be started. */ 2635 __dasd_block_start_head(block); 2636 spin_unlock(&block->queue_lock); 2637 spin_unlock_irq(&block->request_queue_lock); 2638 if (waitqueue_active(&shutdown_waitq)) 2639 wake_up(&shutdown_waitq); 2640 dasd_put_device(block->base); 2641 } 2642 2643 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) 2644 { 2645 wake_up(&dasd_flush_wq); 2646 } 2647 2648 /* 2649 * Go through all request on the dasd_block request queue, cancel them 2650 * on the respective dasd_device, and return them to the generic 2651 * block layer. 2652 */ 2653 static int dasd_flush_block_queue(struct dasd_block *block) 2654 { 2655 struct dasd_ccw_req *cqr, *n; 2656 int rc, i; 2657 struct list_head flush_queue; 2658 2659 INIT_LIST_HEAD(&flush_queue); 2660 spin_lock_bh(&block->queue_lock); 2661 rc = 0; 2662 restart: 2663 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 2664 /* if this request currently owned by a dasd_device cancel it */ 2665 if (cqr->status >= DASD_CQR_QUEUED) 2666 rc = dasd_cancel_req(cqr); 2667 if (rc < 0) 2668 break; 2669 /* Rechain request (including erp chain) so it won't be 2670 * touched by the dasd_block_tasklet anymore. 2671 * Replace the callback so we notice when the request 2672 * is returned from the dasd_device layer. 2673 */ 2674 cqr->callback = _dasd_wake_block_flush_cb; 2675 for (i = 0; cqr != NULL; cqr = cqr->refers, i++) 2676 list_move_tail(&cqr->blocklist, &flush_queue); 2677 if (i > 1) 2678 /* moved more than one request - need to restart */ 2679 goto restart; 2680 } 2681 spin_unlock_bh(&block->queue_lock); 2682 /* Now call the callback function of flushed requests */ 2683 restart_cb: 2684 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { 2685 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 2686 /* Process finished ERP request. */ 2687 if (cqr->refers) { 2688 spin_lock_bh(&block->queue_lock); 2689 __dasd_process_erp(block->base, cqr); 2690 spin_unlock_bh(&block->queue_lock); 2691 /* restart list_for_xx loop since dasd_process_erp 2692 * might remove multiple elements */ 2693 goto restart_cb; 2694 } 2695 /* call the callback function */ 2696 spin_lock_irq(&block->request_queue_lock); 2697 cqr->endclk = get_clock(); 2698 list_del_init(&cqr->blocklist); 2699 __dasd_cleanup_cqr(cqr); 2700 spin_unlock_irq(&block->request_queue_lock); 2701 } 2702 return rc; 2703 } 2704 2705 /* 2706 * Schedules a call to dasd_tasklet over the device tasklet. 2707 */ 2708 void dasd_schedule_block_bh(struct dasd_block *block) 2709 { 2710 /* Protect against rescheduling. */ 2711 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) 2712 return; 2713 /* life cycle of block is bound to it's base device */ 2714 dasd_get_device(block->base); 2715 tasklet_hi_schedule(&block->tasklet); 2716 } 2717 2718 2719 /* 2720 * SECTION: external block device operations 2721 * (request queue handling, open, release, etc.) 2722 */ 2723 2724 /* 2725 * Dasd request queue function. Called from ll_rw_blk.c 2726 */ 2727 static void do_dasd_request(struct request_queue *queue) 2728 { 2729 struct dasd_block *block; 2730 2731 block = queue->queuedata; 2732 spin_lock(&block->queue_lock); 2733 /* Get new request from the block device request queue */ 2734 __dasd_process_request_queue(block); 2735 /* Now check if the head of the ccw queue needs to be started. */ 2736 __dasd_block_start_head(block); 2737 spin_unlock(&block->queue_lock); 2738 } 2739 2740 /* 2741 * Allocate and initialize request queue and default I/O scheduler. 2742 */ 2743 static int dasd_alloc_queue(struct dasd_block *block) 2744 { 2745 int rc; 2746 2747 block->request_queue = blk_init_queue(do_dasd_request, 2748 &block->request_queue_lock); 2749 if (block->request_queue == NULL) 2750 return -ENOMEM; 2751 2752 block->request_queue->queuedata = block; 2753 2754 elevator_exit(block->request_queue->elevator); 2755 block->request_queue->elevator = NULL; 2756 rc = elevator_init(block->request_queue, "deadline"); 2757 if (rc) { 2758 blk_cleanup_queue(block->request_queue); 2759 return rc; 2760 } 2761 return 0; 2762 } 2763 2764 /* 2765 * Allocate and initialize request queue. 2766 */ 2767 static void dasd_setup_queue(struct dasd_block *block) 2768 { 2769 int max; 2770 2771 if (block->base->features & DASD_FEATURE_USERAW) { 2772 /* 2773 * the max_blocks value for raw_track access is 256 2774 * it is higher than the native ECKD value because we 2775 * only need one ccw per track 2776 * so the max_hw_sectors are 2777 * 2048 x 512B = 1024kB = 16 tracks 2778 */ 2779 max = 2048; 2780 } else { 2781 max = block->base->discipline->max_blocks << block->s2b_shift; 2782 } 2783 blk_queue_logical_block_size(block->request_queue, 2784 block->bp_block); 2785 blk_queue_max_hw_sectors(block->request_queue, max); 2786 blk_queue_max_segments(block->request_queue, -1L); 2787 /* with page sized segments we can translate each segement into 2788 * one idaw/tidaw 2789 */ 2790 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); 2791 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); 2792 } 2793 2794 /* 2795 * Deactivate and free request queue. 2796 */ 2797 static void dasd_free_queue(struct dasd_block *block) 2798 { 2799 if (block->request_queue) { 2800 blk_cleanup_queue(block->request_queue); 2801 block->request_queue = NULL; 2802 } 2803 } 2804 2805 /* 2806 * Flush request on the request queue. 2807 */ 2808 static void dasd_flush_request_queue(struct dasd_block *block) 2809 { 2810 struct request *req; 2811 2812 if (!block->request_queue) 2813 return; 2814 2815 spin_lock_irq(&block->request_queue_lock); 2816 while ((req = blk_fetch_request(block->request_queue))) 2817 __blk_end_request_all(req, -EIO); 2818 spin_unlock_irq(&block->request_queue_lock); 2819 } 2820 2821 static int dasd_open(struct block_device *bdev, fmode_t mode) 2822 { 2823 struct dasd_device *base; 2824 int rc; 2825 2826 base = dasd_device_from_gendisk(bdev->bd_disk); 2827 if (!base) 2828 return -ENODEV; 2829 2830 atomic_inc(&base->block->open_count); 2831 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { 2832 rc = -ENODEV; 2833 goto unlock; 2834 } 2835 2836 if (!try_module_get(base->discipline->owner)) { 2837 rc = -EINVAL; 2838 goto unlock; 2839 } 2840 2841 if (dasd_probeonly) { 2842 dev_info(&base->cdev->dev, 2843 "Accessing the DASD failed because it is in " 2844 "probeonly mode\n"); 2845 rc = -EPERM; 2846 goto out; 2847 } 2848 2849 if (base->state <= DASD_STATE_BASIC) { 2850 DBF_DEV_EVENT(DBF_ERR, base, " %s", 2851 " Cannot open unrecognized device"); 2852 rc = -ENODEV; 2853 goto out; 2854 } 2855 2856 if ((mode & FMODE_WRITE) && 2857 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || 2858 (base->features & DASD_FEATURE_READONLY))) { 2859 rc = -EROFS; 2860 goto out; 2861 } 2862 2863 dasd_put_device(base); 2864 return 0; 2865 2866 out: 2867 module_put(base->discipline->owner); 2868 unlock: 2869 atomic_dec(&base->block->open_count); 2870 dasd_put_device(base); 2871 return rc; 2872 } 2873 2874 static int dasd_release(struct gendisk *disk, fmode_t mode) 2875 { 2876 struct dasd_device *base; 2877 2878 base = dasd_device_from_gendisk(disk); 2879 if (!base) 2880 return -ENODEV; 2881 2882 atomic_dec(&base->block->open_count); 2883 module_put(base->discipline->owner); 2884 dasd_put_device(base); 2885 return 0; 2886 } 2887 2888 /* 2889 * Return disk geometry. 2890 */ 2891 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 2892 { 2893 struct dasd_device *base; 2894 2895 base = dasd_device_from_gendisk(bdev->bd_disk); 2896 if (!base) 2897 return -ENODEV; 2898 2899 if (!base->discipline || 2900 !base->discipline->fill_geometry) { 2901 dasd_put_device(base); 2902 return -EINVAL; 2903 } 2904 base->discipline->fill_geometry(base->block, geo); 2905 geo->start = get_start_sect(bdev) >> base->block->s2b_shift; 2906 dasd_put_device(base); 2907 return 0; 2908 } 2909 2910 const struct block_device_operations 2911 dasd_device_operations = { 2912 .owner = THIS_MODULE, 2913 .open = dasd_open, 2914 .release = dasd_release, 2915 .ioctl = dasd_ioctl, 2916 .compat_ioctl = dasd_ioctl, 2917 .getgeo = dasd_getgeo, 2918 }; 2919 2920 /******************************************************************************* 2921 * end of block device operations 2922 */ 2923 2924 static void 2925 dasd_exit(void) 2926 { 2927 #ifdef CONFIG_PROC_FS 2928 dasd_proc_exit(); 2929 #endif 2930 dasd_eer_exit(); 2931 if (dasd_page_cache != NULL) { 2932 kmem_cache_destroy(dasd_page_cache); 2933 dasd_page_cache = NULL; 2934 } 2935 dasd_gendisk_exit(); 2936 dasd_devmap_exit(); 2937 if (dasd_debug_area != NULL) { 2938 debug_unregister(dasd_debug_area); 2939 dasd_debug_area = NULL; 2940 } 2941 dasd_statistics_removeroot(); 2942 } 2943 2944 /* 2945 * SECTION: common functions for ccw_driver use 2946 */ 2947 2948 /* 2949 * Is the device read-only? 2950 * Note that this function does not report the setting of the 2951 * readonly device attribute, but how it is configured in z/VM. 2952 */ 2953 int dasd_device_is_ro(struct dasd_device *device) 2954 { 2955 struct ccw_dev_id dev_id; 2956 struct diag210 diag_data; 2957 int rc; 2958 2959 if (!MACHINE_IS_VM) 2960 return 0; 2961 ccw_device_get_id(device->cdev, &dev_id); 2962 memset(&diag_data, 0, sizeof(diag_data)); 2963 diag_data.vrdcdvno = dev_id.devno; 2964 diag_data.vrdclen = sizeof(diag_data); 2965 rc = diag210(&diag_data); 2966 if (rc == 0 || rc == 2) { 2967 return diag_data.vrdcvfla & 0x80; 2968 } else { 2969 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", 2970 dev_id.devno, rc); 2971 return 0; 2972 } 2973 } 2974 EXPORT_SYMBOL_GPL(dasd_device_is_ro); 2975 2976 static void dasd_generic_auto_online(void *data, async_cookie_t cookie) 2977 { 2978 struct ccw_device *cdev = data; 2979 int ret; 2980 2981 ret = ccw_device_set_online(cdev); 2982 if (ret) 2983 pr_warning("%s: Setting the DASD online failed with rc=%d\n", 2984 dev_name(&cdev->dev), ret); 2985 } 2986 2987 /* 2988 * Initial attempt at a probe function. this can be simplified once 2989 * the other detection code is gone. 2990 */ 2991 int dasd_generic_probe(struct ccw_device *cdev, 2992 struct dasd_discipline *discipline) 2993 { 2994 int ret; 2995 2996 ret = dasd_add_sysfs_files(cdev); 2997 if (ret) { 2998 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", 2999 "dasd_generic_probe: could not add " 3000 "sysfs entries"); 3001 return ret; 3002 } 3003 cdev->handler = &dasd_int_handler; 3004 3005 /* 3006 * Automatically online either all dasd devices (dasd_autodetect) 3007 * or all devices specified with dasd= parameters during 3008 * initial probe. 3009 */ 3010 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || 3011 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) 3012 async_schedule(dasd_generic_auto_online, cdev); 3013 return 0; 3014 } 3015 3016 /* 3017 * This will one day be called from a global not_oper handler. 3018 * It is also used by driver_unregister during module unload. 3019 */ 3020 void dasd_generic_remove(struct ccw_device *cdev) 3021 { 3022 struct dasd_device *device; 3023 struct dasd_block *block; 3024 3025 cdev->handler = NULL; 3026 3027 dasd_remove_sysfs_files(cdev); 3028 device = dasd_device_from_cdev(cdev); 3029 if (IS_ERR(device)) 3030 return; 3031 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3032 /* Already doing offline processing */ 3033 dasd_put_device(device); 3034 return; 3035 } 3036 /* 3037 * This device is removed unconditionally. Set offline 3038 * flag to prevent dasd_open from opening it while it is 3039 * no quite down yet. 3040 */ 3041 dasd_set_target_state(device, DASD_STATE_NEW); 3042 /* dasd_delete_device destroys the device reference. */ 3043 block = device->block; 3044 dasd_delete_device(device); 3045 /* 3046 * life cycle of block is bound to device, so delete it after 3047 * device was safely removed 3048 */ 3049 if (block) 3050 dasd_free_block(block); 3051 } 3052 3053 /* 3054 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either 3055 * the device is detected for the first time and is supposed to be used 3056 * or the user has started activation through sysfs. 3057 */ 3058 int dasd_generic_set_online(struct ccw_device *cdev, 3059 struct dasd_discipline *base_discipline) 3060 { 3061 struct dasd_discipline *discipline; 3062 struct dasd_device *device; 3063 int rc; 3064 3065 /* first online clears initial online feature flag */ 3066 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); 3067 device = dasd_create_device(cdev); 3068 if (IS_ERR(device)) 3069 return PTR_ERR(device); 3070 3071 discipline = base_discipline; 3072 if (device->features & DASD_FEATURE_USEDIAG) { 3073 if (!dasd_diag_discipline_pointer) { 3074 pr_warning("%s Setting the DASD online failed because " 3075 "of missing DIAG discipline\n", 3076 dev_name(&cdev->dev)); 3077 dasd_delete_device(device); 3078 return -ENODEV; 3079 } 3080 discipline = dasd_diag_discipline_pointer; 3081 } 3082 if (!try_module_get(base_discipline->owner)) { 3083 dasd_delete_device(device); 3084 return -EINVAL; 3085 } 3086 if (!try_module_get(discipline->owner)) { 3087 module_put(base_discipline->owner); 3088 dasd_delete_device(device); 3089 return -EINVAL; 3090 } 3091 device->base_discipline = base_discipline; 3092 device->discipline = discipline; 3093 3094 /* check_device will allocate block device if necessary */ 3095 rc = discipline->check_device(device); 3096 if (rc) { 3097 pr_warning("%s Setting the DASD online with discipline %s " 3098 "failed with rc=%i\n", 3099 dev_name(&cdev->dev), discipline->name, rc); 3100 module_put(discipline->owner); 3101 module_put(base_discipline->owner); 3102 dasd_delete_device(device); 3103 return rc; 3104 } 3105 3106 dasd_set_target_state(device, DASD_STATE_ONLINE); 3107 if (device->state <= DASD_STATE_KNOWN) { 3108 pr_warning("%s Setting the DASD online failed because of a " 3109 "missing discipline\n", dev_name(&cdev->dev)); 3110 rc = -ENODEV; 3111 dasd_set_target_state(device, DASD_STATE_NEW); 3112 if (device->block) 3113 dasd_free_block(device->block); 3114 dasd_delete_device(device); 3115 } else 3116 pr_debug("dasd_generic device %s found\n", 3117 dev_name(&cdev->dev)); 3118 3119 wait_event(dasd_init_waitq, _wait_for_device(device)); 3120 3121 dasd_put_device(device); 3122 return rc; 3123 } 3124 3125 int dasd_generic_set_offline(struct ccw_device *cdev) 3126 { 3127 struct dasd_device *device; 3128 struct dasd_block *block; 3129 int max_count, open_count; 3130 3131 device = dasd_device_from_cdev(cdev); 3132 if (IS_ERR(device)) 3133 return PTR_ERR(device); 3134 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3135 /* Already doing offline processing */ 3136 dasd_put_device(device); 3137 return 0; 3138 } 3139 /* 3140 * We must make sure that this device is currently not in use. 3141 * The open_count is increased for every opener, that includes 3142 * the blkdev_get in dasd_scan_partitions. We are only interested 3143 * in the other openers. 3144 */ 3145 if (device->block) { 3146 max_count = device->block->bdev ? 0 : -1; 3147 open_count = atomic_read(&device->block->open_count); 3148 if (open_count > max_count) { 3149 if (open_count > 0) 3150 pr_warning("%s: The DASD cannot be set offline " 3151 "with open count %i\n", 3152 dev_name(&cdev->dev), open_count); 3153 else 3154 pr_warning("%s: The DASD cannot be set offline " 3155 "while it is in use\n", 3156 dev_name(&cdev->dev)); 3157 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3158 dasd_put_device(device); 3159 return -EBUSY; 3160 } 3161 } 3162 dasd_set_target_state(device, DASD_STATE_NEW); 3163 /* dasd_delete_device destroys the device reference. */ 3164 block = device->block; 3165 dasd_delete_device(device); 3166 /* 3167 * life cycle of block is bound to device, so delete it after 3168 * device was safely removed 3169 */ 3170 if (block) 3171 dasd_free_block(block); 3172 return 0; 3173 } 3174 3175 int dasd_generic_last_path_gone(struct dasd_device *device) 3176 { 3177 struct dasd_ccw_req *cqr; 3178 3179 dev_warn(&device->cdev->dev, "No operational channel path is left " 3180 "for the device\n"); 3181 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); 3182 /* First of all call extended error reporting. */ 3183 dasd_eer_write(device, NULL, DASD_EER_NOPATH); 3184 3185 if (device->state < DASD_STATE_BASIC) 3186 return 0; 3187 /* Device is active. We want to keep it. */ 3188 list_for_each_entry(cqr, &device->ccw_queue, devlist) 3189 if ((cqr->status == DASD_CQR_IN_IO) || 3190 (cqr->status == DASD_CQR_CLEAR_PENDING)) { 3191 cqr->status = DASD_CQR_QUEUED; 3192 cqr->retries++; 3193 } 3194 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); 3195 dasd_device_clear_timer(device); 3196 dasd_schedule_device_bh(device); 3197 return 1; 3198 } 3199 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); 3200 3201 int dasd_generic_path_operational(struct dasd_device *device) 3202 { 3203 dev_info(&device->cdev->dev, "A channel path to the device has become " 3204 "operational\n"); 3205 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); 3206 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); 3207 if (device->stopped & DASD_UNRESUMED_PM) { 3208 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); 3209 dasd_restore_device(device); 3210 return 1; 3211 } 3212 dasd_schedule_device_bh(device); 3213 if (device->block) 3214 dasd_schedule_block_bh(device->block); 3215 return 1; 3216 } 3217 EXPORT_SYMBOL_GPL(dasd_generic_path_operational); 3218 3219 int dasd_generic_notify(struct ccw_device *cdev, int event) 3220 { 3221 struct dasd_device *device; 3222 int ret; 3223 3224 device = dasd_device_from_cdev_locked(cdev); 3225 if (IS_ERR(device)) 3226 return 0; 3227 ret = 0; 3228 switch (event) { 3229 case CIO_GONE: 3230 case CIO_BOXED: 3231 case CIO_NO_PATH: 3232 device->path_data.opm = 0; 3233 device->path_data.ppm = 0; 3234 device->path_data.npm = 0; 3235 ret = dasd_generic_last_path_gone(device); 3236 break; 3237 case CIO_OPER: 3238 ret = 1; 3239 if (device->path_data.opm) 3240 ret = dasd_generic_path_operational(device); 3241 break; 3242 } 3243 dasd_put_device(device); 3244 return ret; 3245 } 3246 3247 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) 3248 { 3249 int chp; 3250 __u8 oldopm, eventlpm; 3251 struct dasd_device *device; 3252 3253 device = dasd_device_from_cdev_locked(cdev); 3254 if (IS_ERR(device)) 3255 return; 3256 for (chp = 0; chp < 8; chp++) { 3257 eventlpm = 0x80 >> chp; 3258 if (path_event[chp] & PE_PATH_GONE) { 3259 oldopm = device->path_data.opm; 3260 device->path_data.opm &= ~eventlpm; 3261 device->path_data.ppm &= ~eventlpm; 3262 device->path_data.npm &= ~eventlpm; 3263 if (oldopm && !device->path_data.opm) 3264 dasd_generic_last_path_gone(device); 3265 } 3266 if (path_event[chp] & PE_PATH_AVAILABLE) { 3267 device->path_data.opm &= ~eventlpm; 3268 device->path_data.ppm &= ~eventlpm; 3269 device->path_data.npm &= ~eventlpm; 3270 device->path_data.tbvpm |= eventlpm; 3271 dasd_schedule_device_bh(device); 3272 } 3273 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { 3274 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 3275 "Pathgroup re-established\n"); 3276 if (device->discipline->kick_validate) 3277 device->discipline->kick_validate(device); 3278 } 3279 } 3280 dasd_put_device(device); 3281 } 3282 EXPORT_SYMBOL_GPL(dasd_generic_path_event); 3283 3284 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) 3285 { 3286 if (!device->path_data.opm && lpm) { 3287 device->path_data.opm = lpm; 3288 dasd_generic_path_operational(device); 3289 } else 3290 device->path_data.opm |= lpm; 3291 return 0; 3292 } 3293 EXPORT_SYMBOL_GPL(dasd_generic_verify_path); 3294 3295 3296 int dasd_generic_pm_freeze(struct ccw_device *cdev) 3297 { 3298 struct dasd_ccw_req *cqr, *n; 3299 int rc; 3300 struct list_head freeze_queue; 3301 struct dasd_device *device = dasd_device_from_cdev(cdev); 3302 3303 if (IS_ERR(device)) 3304 return PTR_ERR(device); 3305 3306 /* mark device as suspended */ 3307 set_bit(DASD_FLAG_SUSPENDED, &device->flags); 3308 3309 if (device->discipline->freeze) 3310 rc = device->discipline->freeze(device); 3311 3312 /* disallow new I/O */ 3313 dasd_device_set_stop_bits(device, DASD_STOPPED_PM); 3314 /* clear active requests */ 3315 INIT_LIST_HEAD(&freeze_queue); 3316 spin_lock_irq(get_ccwdev_lock(cdev)); 3317 rc = 0; 3318 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 3319 /* Check status and move request to flush_queue */ 3320 if (cqr->status == DASD_CQR_IN_IO) { 3321 rc = device->discipline->term_IO(cqr); 3322 if (rc) { 3323 /* unable to terminate requeust */ 3324 dev_err(&device->cdev->dev, 3325 "Unable to terminate request %p " 3326 "on suspend\n", cqr); 3327 spin_unlock_irq(get_ccwdev_lock(cdev)); 3328 dasd_put_device(device); 3329 return rc; 3330 } 3331 } 3332 list_move_tail(&cqr->devlist, &freeze_queue); 3333 } 3334 3335 spin_unlock_irq(get_ccwdev_lock(cdev)); 3336 3337 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { 3338 wait_event(dasd_flush_wq, 3339 (cqr->status != DASD_CQR_CLEAR_PENDING)); 3340 if (cqr->status == DASD_CQR_CLEARED) 3341 cqr->status = DASD_CQR_QUEUED; 3342 } 3343 /* move freeze_queue to start of the ccw_queue */ 3344 spin_lock_irq(get_ccwdev_lock(cdev)); 3345 list_splice_tail(&freeze_queue, &device->ccw_queue); 3346 spin_unlock_irq(get_ccwdev_lock(cdev)); 3347 3348 dasd_put_device(device); 3349 return rc; 3350 } 3351 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); 3352 3353 int dasd_generic_restore_device(struct ccw_device *cdev) 3354 { 3355 struct dasd_device *device = dasd_device_from_cdev(cdev); 3356 int rc = 0; 3357 3358 if (IS_ERR(device)) 3359 return PTR_ERR(device); 3360 3361 /* allow new IO again */ 3362 dasd_device_remove_stop_bits(device, 3363 (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); 3364 3365 dasd_schedule_device_bh(device); 3366 3367 /* 3368 * call discipline restore function 3369 * if device is stopped do nothing e.g. for disconnected devices 3370 */ 3371 if (device->discipline->restore && !(device->stopped)) 3372 rc = device->discipline->restore(device); 3373 if (rc || device->stopped) 3374 /* 3375 * if the resume failed for the DASD we put it in 3376 * an UNRESUMED stop state 3377 */ 3378 device->stopped |= DASD_UNRESUMED_PM; 3379 3380 if (device->block) 3381 dasd_schedule_block_bh(device->block); 3382 3383 clear_bit(DASD_FLAG_SUSPENDED, &device->flags); 3384 dasd_put_device(device); 3385 return 0; 3386 } 3387 EXPORT_SYMBOL_GPL(dasd_generic_restore_device); 3388 3389 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, 3390 void *rdc_buffer, 3391 int rdc_buffer_size, 3392 int magic) 3393 { 3394 struct dasd_ccw_req *cqr; 3395 struct ccw1 *ccw; 3396 unsigned long *idaw; 3397 3398 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); 3399 3400 if (IS_ERR(cqr)) { 3401 /* internal error 13 - Allocating the RDC request failed*/ 3402 dev_err(&device->cdev->dev, 3403 "An error occurred in the DASD device driver, " 3404 "reason=%s\n", "13"); 3405 return cqr; 3406 } 3407 3408 ccw = cqr->cpaddr; 3409 ccw->cmd_code = CCW_CMD_RDC; 3410 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { 3411 idaw = (unsigned long *) (cqr->data); 3412 ccw->cda = (__u32)(addr_t) idaw; 3413 ccw->flags = CCW_FLAG_IDA; 3414 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); 3415 } else { 3416 ccw->cda = (__u32)(addr_t) rdc_buffer; 3417 ccw->flags = 0; 3418 } 3419 3420 ccw->count = rdc_buffer_size; 3421 cqr->startdev = device; 3422 cqr->memdev = device; 3423 cqr->expires = 10*HZ; 3424 cqr->retries = 256; 3425 cqr->buildclk = get_clock(); 3426 cqr->status = DASD_CQR_FILLED; 3427 return cqr; 3428 } 3429 3430 3431 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, 3432 void *rdc_buffer, int rdc_buffer_size) 3433 { 3434 int ret; 3435 struct dasd_ccw_req *cqr; 3436 3437 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, 3438 magic); 3439 if (IS_ERR(cqr)) 3440 return PTR_ERR(cqr); 3441 3442 ret = dasd_sleep_on(cqr); 3443 dasd_sfree_request(cqr, cqr->memdev); 3444 return ret; 3445 } 3446 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); 3447 3448 /* 3449 * In command mode and transport mode we need to look for sense 3450 * data in different places. The sense data itself is allways 3451 * an array of 32 bytes, so we can unify the sense data access 3452 * for both modes. 3453 */ 3454 char *dasd_get_sense(struct irb *irb) 3455 { 3456 struct tsb *tsb = NULL; 3457 char *sense = NULL; 3458 3459 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { 3460 if (irb->scsw.tm.tcw) 3461 tsb = tcw_get_tsb((struct tcw *)(unsigned long) 3462 irb->scsw.tm.tcw); 3463 if (tsb && tsb->length == 64 && tsb->flags) 3464 switch (tsb->flags & 0x07) { 3465 case 1: /* tsa_iostat */ 3466 sense = tsb->tsa.iostat.sense; 3467 break; 3468 case 2: /* tsa_ddpc */ 3469 sense = tsb->tsa.ddpc.sense; 3470 break; 3471 default: 3472 /* currently we don't use interrogate data */ 3473 break; 3474 } 3475 } else if (irb->esw.esw0.erw.cons) { 3476 sense = irb->ecw; 3477 } 3478 return sense; 3479 } 3480 EXPORT_SYMBOL_GPL(dasd_get_sense); 3481 3482 static inline int _wait_for_empty_queues(struct dasd_device *device) 3483 { 3484 if (device->block) 3485 return list_empty(&device->ccw_queue) && 3486 list_empty(&device->block->ccw_queue); 3487 else 3488 return list_empty(&device->ccw_queue); 3489 } 3490 3491 void dasd_generic_shutdown(struct ccw_device *cdev) 3492 { 3493 struct dasd_device *device; 3494 3495 device = dasd_device_from_cdev(cdev); 3496 if (IS_ERR(device)) 3497 return; 3498 3499 if (device->block) 3500 dasd_schedule_block_bh(device->block); 3501 3502 dasd_schedule_device_bh(device); 3503 3504 wait_event(shutdown_waitq, _wait_for_empty_queues(device)); 3505 } 3506 EXPORT_SYMBOL_GPL(dasd_generic_shutdown); 3507 3508 static int __init dasd_init(void) 3509 { 3510 int rc; 3511 3512 init_waitqueue_head(&dasd_init_waitq); 3513 init_waitqueue_head(&dasd_flush_wq); 3514 init_waitqueue_head(&generic_waitq); 3515 init_waitqueue_head(&shutdown_waitq); 3516 3517 /* register 'common' DASD debug area, used for all DBF_XXX calls */ 3518 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); 3519 if (dasd_debug_area == NULL) { 3520 rc = -ENOMEM; 3521 goto failed; 3522 } 3523 debug_register_view(dasd_debug_area, &debug_sprintf_view); 3524 debug_set_level(dasd_debug_area, DBF_WARNING); 3525 3526 DBF_EVENT(DBF_EMERG, "%s", "debug area created"); 3527 3528 dasd_diag_discipline_pointer = NULL; 3529 3530 dasd_statistics_createroot(); 3531 3532 rc = dasd_devmap_init(); 3533 if (rc) 3534 goto failed; 3535 rc = dasd_gendisk_init(); 3536 if (rc) 3537 goto failed; 3538 rc = dasd_parse(); 3539 if (rc) 3540 goto failed; 3541 rc = dasd_eer_init(); 3542 if (rc) 3543 goto failed; 3544 #ifdef CONFIG_PROC_FS 3545 rc = dasd_proc_init(); 3546 if (rc) 3547 goto failed; 3548 #endif 3549 3550 return 0; 3551 failed: 3552 pr_info("The DASD device driver could not be initialized\n"); 3553 dasd_exit(); 3554 return rc; 3555 } 3556 3557 module_init(dasd_init); 3558 module_exit(dasd_exit); 3559 3560 EXPORT_SYMBOL(dasd_debug_area); 3561 EXPORT_SYMBOL(dasd_diag_discipline_pointer); 3562 3563 EXPORT_SYMBOL(dasd_add_request_head); 3564 EXPORT_SYMBOL(dasd_add_request_tail); 3565 EXPORT_SYMBOL(dasd_cancel_req); 3566 EXPORT_SYMBOL(dasd_device_clear_timer); 3567 EXPORT_SYMBOL(dasd_block_clear_timer); 3568 EXPORT_SYMBOL(dasd_enable_device); 3569 EXPORT_SYMBOL(dasd_int_handler); 3570 EXPORT_SYMBOL(dasd_kfree_request); 3571 EXPORT_SYMBOL(dasd_kick_device); 3572 EXPORT_SYMBOL(dasd_kmalloc_request); 3573 EXPORT_SYMBOL(dasd_schedule_device_bh); 3574 EXPORT_SYMBOL(dasd_schedule_block_bh); 3575 EXPORT_SYMBOL(dasd_set_target_state); 3576 EXPORT_SYMBOL(dasd_device_set_timer); 3577 EXPORT_SYMBOL(dasd_block_set_timer); 3578 EXPORT_SYMBOL(dasd_sfree_request); 3579 EXPORT_SYMBOL(dasd_sleep_on); 3580 EXPORT_SYMBOL(dasd_sleep_on_immediatly); 3581 EXPORT_SYMBOL(dasd_sleep_on_interruptible); 3582 EXPORT_SYMBOL(dasd_smalloc_request); 3583 EXPORT_SYMBOL(dasd_start_IO); 3584 EXPORT_SYMBOL(dasd_term_IO); 3585 3586 EXPORT_SYMBOL_GPL(dasd_generic_probe); 3587 EXPORT_SYMBOL_GPL(dasd_generic_remove); 3588 EXPORT_SYMBOL_GPL(dasd_generic_notify); 3589 EXPORT_SYMBOL_GPL(dasd_generic_set_online); 3590 EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 3591 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); 3592 EXPORT_SYMBOL_GPL(dasd_flush_device_queue); 3593 EXPORT_SYMBOL_GPL(dasd_alloc_block); 3594 EXPORT_SYMBOL_GPL(dasd_free_block); 3595