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 86 /* 87 * Allocate memory for a new device structure. 88 */ 89 struct dasd_device *dasd_alloc_device(void) 90 { 91 struct dasd_device *device; 92 93 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); 94 if (!device) 95 return ERR_PTR(-ENOMEM); 96 97 /* Get two pages for normal block device operations. */ 98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); 99 if (!device->ccw_mem) { 100 kfree(device); 101 return ERR_PTR(-ENOMEM); 102 } 103 /* Get one page for error recovery. */ 104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); 105 if (!device->erp_mem) { 106 free_pages((unsigned long) device->ccw_mem, 1); 107 kfree(device); 108 return ERR_PTR(-ENOMEM); 109 } 110 111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); 112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); 113 spin_lock_init(&device->mem_lock); 114 atomic_set(&device->tasklet_scheduled, 0); 115 tasklet_init(&device->tasklet, 116 (void (*)(unsigned long)) dasd_device_tasklet, 117 (unsigned long) device); 118 INIT_LIST_HEAD(&device->ccw_queue); 119 init_timer(&device->timer); 120 device->timer.function = dasd_device_timeout; 121 device->timer.data = (unsigned long) device; 122 INIT_WORK(&device->kick_work, do_kick_device); 123 INIT_WORK(&device->restore_device, do_restore_device); 124 INIT_WORK(&device->reload_device, do_reload_device); 125 device->state = DASD_STATE_NEW; 126 device->target = DASD_STATE_NEW; 127 mutex_init(&device->state_mutex); 128 spin_lock_init(&device->profile.lock); 129 return device; 130 } 131 132 /* 133 * Free memory of a device structure. 134 */ 135 void dasd_free_device(struct dasd_device *device) 136 { 137 kfree(device->private); 138 free_page((unsigned long) device->erp_mem); 139 free_pages((unsigned long) device->ccw_mem, 1); 140 kfree(device); 141 } 142 143 /* 144 * Allocate memory for a new device structure. 145 */ 146 struct dasd_block *dasd_alloc_block(void) 147 { 148 struct dasd_block *block; 149 150 block = kzalloc(sizeof(*block), GFP_ATOMIC); 151 if (!block) 152 return ERR_PTR(-ENOMEM); 153 /* open_count = 0 means device online but not in use */ 154 atomic_set(&block->open_count, -1); 155 156 spin_lock_init(&block->request_queue_lock); 157 atomic_set(&block->tasklet_scheduled, 0); 158 tasklet_init(&block->tasklet, 159 (void (*)(unsigned long)) dasd_block_tasklet, 160 (unsigned long) block); 161 INIT_LIST_HEAD(&block->ccw_queue); 162 spin_lock_init(&block->queue_lock); 163 init_timer(&block->timer); 164 block->timer.function = dasd_block_timeout; 165 block->timer.data = (unsigned long) block; 166 spin_lock_init(&block->profile.lock); 167 168 return block; 169 } 170 171 /* 172 * Free memory of a device structure. 173 */ 174 void dasd_free_block(struct dasd_block *block) 175 { 176 kfree(block); 177 } 178 179 /* 180 * Make a new device known to the system. 181 */ 182 static int dasd_state_new_to_known(struct dasd_device *device) 183 { 184 int rc; 185 186 /* 187 * As long as the device is not in state DASD_STATE_NEW we want to 188 * keep the reference count > 0. 189 */ 190 dasd_get_device(device); 191 192 if (device->block) { 193 rc = dasd_alloc_queue(device->block); 194 if (rc) { 195 dasd_put_device(device); 196 return rc; 197 } 198 } 199 device->state = DASD_STATE_KNOWN; 200 return 0; 201 } 202 203 /* 204 * Let the system forget about a device. 205 */ 206 static int dasd_state_known_to_new(struct dasd_device *device) 207 { 208 /* Disable extended error reporting for this device. */ 209 dasd_eer_disable(device); 210 /* Forget the discipline information. */ 211 if (device->discipline) { 212 if (device->discipline->uncheck_device) 213 device->discipline->uncheck_device(device); 214 module_put(device->discipline->owner); 215 } 216 device->discipline = NULL; 217 if (device->base_discipline) 218 module_put(device->base_discipline->owner); 219 device->base_discipline = NULL; 220 device->state = DASD_STATE_NEW; 221 222 if (device->block) 223 dasd_free_queue(device->block); 224 225 /* Give up reference we took in dasd_state_new_to_known. */ 226 dasd_put_device(device); 227 return 0; 228 } 229 230 static struct dentry *dasd_debugfs_setup(const char *name, 231 struct dentry *base_dentry) 232 { 233 struct dentry *pde; 234 235 if (!base_dentry) 236 return NULL; 237 pde = debugfs_create_dir(name, base_dentry); 238 if (!pde || IS_ERR(pde)) 239 return NULL; 240 return pde; 241 } 242 243 /* 244 * Request the irq line for the device. 245 */ 246 static int dasd_state_known_to_basic(struct dasd_device *device) 247 { 248 struct dasd_block *block = device->block; 249 int rc; 250 251 /* Allocate and register gendisk structure. */ 252 if (block) { 253 rc = dasd_gendisk_alloc(block); 254 if (rc) 255 return rc; 256 block->debugfs_dentry = 257 dasd_debugfs_setup(block->gdp->disk_name, 258 dasd_debugfs_root_entry); 259 dasd_profile_init(&block->profile, block->debugfs_dentry); 260 if (dasd_global_profile_level == DASD_PROFILE_ON) 261 dasd_profile_on(&device->block->profile); 262 } 263 device->debugfs_dentry = 264 dasd_debugfs_setup(dev_name(&device->cdev->dev), 265 dasd_debugfs_root_entry); 266 dasd_profile_init(&device->profile, device->debugfs_dentry); 267 268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */ 269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, 270 8 * sizeof(long)); 271 debug_register_view(device->debug_area, &debug_sprintf_view); 272 debug_set_level(device->debug_area, DBF_WARNING); 273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); 274 275 device->state = DASD_STATE_BASIC; 276 return 0; 277 } 278 279 /* 280 * Release the irq line for the device. Terminate any running i/o. 281 */ 282 static int dasd_state_basic_to_known(struct dasd_device *device) 283 { 284 int rc; 285 if (device->block) { 286 dasd_profile_exit(&device->block->profile); 287 if (device->block->debugfs_dentry) 288 debugfs_remove(device->block->debugfs_dentry); 289 dasd_gendisk_free(device->block); 290 dasd_block_clear_timer(device->block); 291 } 292 rc = dasd_flush_device_queue(device); 293 if (rc) 294 return rc; 295 dasd_device_clear_timer(device); 296 dasd_profile_exit(&device->profile); 297 if (device->debugfs_dentry) 298 debugfs_remove(device->debugfs_dentry); 299 300 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); 301 if (device->debug_area != NULL) { 302 debug_unregister(device->debug_area); 303 device->debug_area = NULL; 304 } 305 device->state = DASD_STATE_KNOWN; 306 return 0; 307 } 308 309 /* 310 * Do the initial analysis. The do_analysis function may return 311 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC 312 * until the discipline decides to continue the startup sequence 313 * by calling the function dasd_change_state. The eckd disciplines 314 * uses this to start a ccw that detects the format. The completion 315 * interrupt for this detection ccw uses the kernel event daemon to 316 * trigger the call to dasd_change_state. All this is done in the 317 * discipline code, see dasd_eckd.c. 318 * After the analysis ccw is done (do_analysis returned 0) the block 319 * device is setup. 320 * In case the analysis returns an error, the device setup is stopped 321 * (a fake disk was already added to allow formatting). 322 */ 323 static int dasd_state_basic_to_ready(struct dasd_device *device) 324 { 325 int rc; 326 struct dasd_block *block; 327 328 rc = 0; 329 block = device->block; 330 /* make disk known with correct capacity */ 331 if (block) { 332 if (block->base->discipline->do_analysis != NULL) 333 rc = block->base->discipline->do_analysis(block); 334 if (rc) { 335 if (rc != -EAGAIN) 336 device->state = DASD_STATE_UNFMT; 337 return rc; 338 } 339 dasd_setup_queue(block); 340 set_capacity(block->gdp, 341 block->blocks << block->s2b_shift); 342 device->state = DASD_STATE_READY; 343 rc = dasd_scan_partitions(block); 344 if (rc) 345 device->state = DASD_STATE_BASIC; 346 } else { 347 device->state = DASD_STATE_READY; 348 } 349 return rc; 350 } 351 352 /* 353 * Remove device from block device layer. Destroy dirty buffers. 354 * Forget format information. Check if the target level is basic 355 * and if it is create fake disk for formatting. 356 */ 357 static int dasd_state_ready_to_basic(struct dasd_device *device) 358 { 359 int rc; 360 361 device->state = DASD_STATE_BASIC; 362 if (device->block) { 363 struct dasd_block *block = device->block; 364 rc = dasd_flush_block_queue(block); 365 if (rc) { 366 device->state = DASD_STATE_READY; 367 return rc; 368 } 369 dasd_flush_request_queue(block); 370 dasd_destroy_partitions(block); 371 block->blocks = 0; 372 block->bp_block = 0; 373 block->s2b_shift = 0; 374 } 375 return 0; 376 } 377 378 /* 379 * Back to basic. 380 */ 381 static int dasd_state_unfmt_to_basic(struct dasd_device *device) 382 { 383 device->state = DASD_STATE_BASIC; 384 return 0; 385 } 386 387 /* 388 * Make the device online and schedule the bottom half to start 389 * the requeueing of requests from the linux request queue to the 390 * ccw queue. 391 */ 392 static int 393 dasd_state_ready_to_online(struct dasd_device * device) 394 { 395 int rc; 396 struct gendisk *disk; 397 struct disk_part_iter piter; 398 struct hd_struct *part; 399 400 if (device->discipline->ready_to_online) { 401 rc = device->discipline->ready_to_online(device); 402 if (rc) 403 return rc; 404 } 405 device->state = DASD_STATE_ONLINE; 406 if (device->block) { 407 dasd_schedule_block_bh(device->block); 408 if ((device->features & DASD_FEATURE_USERAW)) { 409 disk = device->block->gdp; 410 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); 411 return 0; 412 } 413 disk = device->block->bdev->bd_disk; 414 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 415 while ((part = disk_part_iter_next(&piter))) 416 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 417 disk_part_iter_exit(&piter); 418 } 419 return 0; 420 } 421 422 /* 423 * Stop the requeueing of requests again. 424 */ 425 static int dasd_state_online_to_ready(struct dasd_device *device) 426 { 427 int rc; 428 struct gendisk *disk; 429 struct disk_part_iter piter; 430 struct hd_struct *part; 431 432 if (device->discipline->online_to_ready) { 433 rc = device->discipline->online_to_ready(device); 434 if (rc) 435 return rc; 436 } 437 device->state = DASD_STATE_READY; 438 if (device->block && !(device->features & DASD_FEATURE_USERAW)) { 439 disk = device->block->bdev->bd_disk; 440 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 441 while ((part = disk_part_iter_next(&piter))) 442 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 443 disk_part_iter_exit(&piter); 444 } 445 return 0; 446 } 447 448 /* 449 * Device startup state changes. 450 */ 451 static int dasd_increase_state(struct dasd_device *device) 452 { 453 int rc; 454 455 rc = 0; 456 if (device->state == DASD_STATE_NEW && 457 device->target >= DASD_STATE_KNOWN) 458 rc = dasd_state_new_to_known(device); 459 460 if (!rc && 461 device->state == DASD_STATE_KNOWN && 462 device->target >= DASD_STATE_BASIC) 463 rc = dasd_state_known_to_basic(device); 464 465 if (!rc && 466 device->state == DASD_STATE_BASIC && 467 device->target >= DASD_STATE_READY) 468 rc = dasd_state_basic_to_ready(device); 469 470 if (!rc && 471 device->state == DASD_STATE_UNFMT && 472 device->target > DASD_STATE_UNFMT) 473 rc = -EPERM; 474 475 if (!rc && 476 device->state == DASD_STATE_READY && 477 device->target >= DASD_STATE_ONLINE) 478 rc = dasd_state_ready_to_online(device); 479 480 return rc; 481 } 482 483 /* 484 * Device shutdown state changes. 485 */ 486 static int dasd_decrease_state(struct dasd_device *device) 487 { 488 int rc; 489 490 rc = 0; 491 if (device->state == DASD_STATE_ONLINE && 492 device->target <= DASD_STATE_READY) 493 rc = dasd_state_online_to_ready(device); 494 495 if (!rc && 496 device->state == DASD_STATE_READY && 497 device->target <= DASD_STATE_BASIC) 498 rc = dasd_state_ready_to_basic(device); 499 500 if (!rc && 501 device->state == DASD_STATE_UNFMT && 502 device->target <= DASD_STATE_BASIC) 503 rc = dasd_state_unfmt_to_basic(device); 504 505 if (!rc && 506 device->state == DASD_STATE_BASIC && 507 device->target <= DASD_STATE_KNOWN) 508 rc = dasd_state_basic_to_known(device); 509 510 if (!rc && 511 device->state == DASD_STATE_KNOWN && 512 device->target <= DASD_STATE_NEW) 513 rc = dasd_state_known_to_new(device); 514 515 return rc; 516 } 517 518 /* 519 * This is the main startup/shutdown routine. 520 */ 521 static void dasd_change_state(struct dasd_device *device) 522 { 523 int rc; 524 525 if (device->state == device->target) 526 /* Already where we want to go today... */ 527 return; 528 if (device->state < device->target) 529 rc = dasd_increase_state(device); 530 else 531 rc = dasd_decrease_state(device); 532 if (rc == -EAGAIN) 533 return; 534 if (rc) 535 device->target = device->state; 536 537 if (device->state == device->target) 538 wake_up(&dasd_init_waitq); 539 540 /* let user-space know that the device status changed */ 541 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); 542 } 543 544 /* 545 * Kick starter for devices that did not complete the startup/shutdown 546 * procedure or were sleeping because of a pending state. 547 * dasd_kick_device will schedule a call do do_kick_device to the kernel 548 * event daemon. 549 */ 550 static void do_kick_device(struct work_struct *work) 551 { 552 struct dasd_device *device = container_of(work, struct dasd_device, kick_work); 553 mutex_lock(&device->state_mutex); 554 dasd_change_state(device); 555 mutex_unlock(&device->state_mutex); 556 dasd_schedule_device_bh(device); 557 dasd_put_device(device); 558 } 559 560 void dasd_kick_device(struct dasd_device *device) 561 { 562 dasd_get_device(device); 563 /* queue call to dasd_kick_device to the kernel event daemon. */ 564 schedule_work(&device->kick_work); 565 } 566 567 /* 568 * dasd_reload_device will schedule a call do do_reload_device to the kernel 569 * event daemon. 570 */ 571 static void do_reload_device(struct work_struct *work) 572 { 573 struct dasd_device *device = container_of(work, struct dasd_device, 574 reload_device); 575 device->discipline->reload(device); 576 dasd_put_device(device); 577 } 578 579 void dasd_reload_device(struct dasd_device *device) 580 { 581 dasd_get_device(device); 582 /* queue call to dasd_reload_device to the kernel event daemon. */ 583 schedule_work(&device->reload_device); 584 } 585 EXPORT_SYMBOL(dasd_reload_device); 586 587 /* 588 * dasd_restore_device will schedule a call do do_restore_device to the kernel 589 * event daemon. 590 */ 591 static void do_restore_device(struct work_struct *work) 592 { 593 struct dasd_device *device = container_of(work, struct dasd_device, 594 restore_device); 595 device->cdev->drv->restore(device->cdev); 596 dasd_put_device(device); 597 } 598 599 void dasd_restore_device(struct dasd_device *device) 600 { 601 dasd_get_device(device); 602 /* queue call to dasd_restore_device to the kernel event daemon. */ 603 schedule_work(&device->restore_device); 604 } 605 606 /* 607 * Set the target state for a device and starts the state change. 608 */ 609 void dasd_set_target_state(struct dasd_device *device, int target) 610 { 611 dasd_get_device(device); 612 mutex_lock(&device->state_mutex); 613 /* If we are in probeonly mode stop at DASD_STATE_READY. */ 614 if (dasd_probeonly && target > DASD_STATE_READY) 615 target = DASD_STATE_READY; 616 if (device->target != target) { 617 if (device->state == target) 618 wake_up(&dasd_init_waitq); 619 device->target = target; 620 } 621 if (device->state != device->target) 622 dasd_change_state(device); 623 mutex_unlock(&device->state_mutex); 624 dasd_put_device(device); 625 } 626 627 /* 628 * Enable devices with device numbers in [from..to]. 629 */ 630 static inline int _wait_for_device(struct dasd_device *device) 631 { 632 return (device->state == device->target); 633 } 634 635 void dasd_enable_device(struct dasd_device *device) 636 { 637 dasd_set_target_state(device, DASD_STATE_ONLINE); 638 if (device->state <= DASD_STATE_KNOWN) 639 /* No discipline for device found. */ 640 dasd_set_target_state(device, DASD_STATE_NEW); 641 /* Now wait for the devices to come up. */ 642 wait_event(dasd_init_waitq, _wait_for_device(device)); 643 } 644 645 /* 646 * SECTION: device operation (interrupt handler, start i/o, term i/o ...) 647 */ 648 649 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; 650 651 #ifdef CONFIG_DASD_PROFILE 652 struct dasd_profile_info dasd_global_profile_data; 653 static struct dentry *dasd_global_profile_dentry; 654 static struct dentry *dasd_debugfs_global_entry; 655 656 /* 657 * Add profiling information for cqr before execution. 658 */ 659 static void dasd_profile_start(struct dasd_block *block, 660 struct dasd_ccw_req *cqr, 661 struct request *req) 662 { 663 struct list_head *l; 664 unsigned int counter; 665 struct dasd_device *device; 666 667 /* count the length of the chanq for statistics */ 668 counter = 0; 669 if (dasd_global_profile_level || block->profile.data) 670 list_for_each(l, &block->ccw_queue) 671 if (++counter >= 31) 672 break; 673 674 if (dasd_global_profile_level) { 675 dasd_global_profile_data.dasd_io_nr_req[counter]++; 676 if (rq_data_dir(req) == READ) 677 dasd_global_profile_data.dasd_read_nr_req[counter]++; 678 } 679 680 spin_lock(&block->profile.lock); 681 if (block->profile.data) 682 block->profile.data->dasd_io_nr_req[counter]++; 683 if (rq_data_dir(req) == READ) 684 block->profile.data->dasd_read_nr_req[counter]++; 685 spin_unlock(&block->profile.lock); 686 687 /* 688 * We count the request for the start device, even though it may run on 689 * some other device due to error recovery. This way we make sure that 690 * we count each request only once. 691 */ 692 device = cqr->startdev; 693 if (device->profile.data) { 694 counter = 1; /* request is not yet queued on the start device */ 695 list_for_each(l, &device->ccw_queue) 696 if (++counter >= 31) 697 break; 698 } 699 spin_lock(&device->profile.lock); 700 if (device->profile.data) { 701 device->profile.data->dasd_io_nr_req[counter]++; 702 if (rq_data_dir(req) == READ) 703 device->profile.data->dasd_read_nr_req[counter]++; 704 } 705 spin_unlock(&device->profile.lock); 706 } 707 708 /* 709 * Add profiling information for cqr after execution. 710 */ 711 712 #define dasd_profile_counter(value, index) \ 713 { \ 714 for (index = 0; index < 31 && value >> (2+index); index++) \ 715 ; \ 716 } 717 718 static void dasd_profile_end_add_data(struct dasd_profile_info *data, 719 int is_alias, 720 int is_tpm, 721 int is_read, 722 long sectors, 723 int sectors_ind, 724 int tottime_ind, 725 int tottimeps_ind, 726 int strtime_ind, 727 int irqtime_ind, 728 int irqtimeps_ind, 729 int endtime_ind) 730 { 731 /* in case of an overflow, reset the whole profile */ 732 if (data->dasd_io_reqs == UINT_MAX) { 733 memset(data, 0, sizeof(*data)); 734 getnstimeofday(&data->starttod); 735 } 736 data->dasd_io_reqs++; 737 data->dasd_io_sects += sectors; 738 if (is_alias) 739 data->dasd_io_alias++; 740 if (is_tpm) 741 data->dasd_io_tpm++; 742 743 data->dasd_io_secs[sectors_ind]++; 744 data->dasd_io_times[tottime_ind]++; 745 data->dasd_io_timps[tottimeps_ind]++; 746 data->dasd_io_time1[strtime_ind]++; 747 data->dasd_io_time2[irqtime_ind]++; 748 data->dasd_io_time2ps[irqtimeps_ind]++; 749 data->dasd_io_time3[endtime_ind]++; 750 751 if (is_read) { 752 data->dasd_read_reqs++; 753 data->dasd_read_sects += sectors; 754 if (is_alias) 755 data->dasd_read_alias++; 756 if (is_tpm) 757 data->dasd_read_tpm++; 758 data->dasd_read_secs[sectors_ind]++; 759 data->dasd_read_times[tottime_ind]++; 760 data->dasd_read_time1[strtime_ind]++; 761 data->dasd_read_time2[irqtime_ind]++; 762 data->dasd_read_time3[endtime_ind]++; 763 } 764 } 765 766 static void dasd_profile_end(struct dasd_block *block, 767 struct dasd_ccw_req *cqr, 768 struct request *req) 769 { 770 long strtime, irqtime, endtime, tottime; /* in microseconds */ 771 long tottimeps, sectors; 772 struct dasd_device *device; 773 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; 774 int irqtime_ind, irqtimeps_ind, endtime_ind; 775 776 device = cqr->startdev; 777 if (!(dasd_global_profile_level || 778 block->profile.data || 779 device->profile.data)) 780 return; 781 782 sectors = blk_rq_sectors(req); 783 if (!cqr->buildclk || !cqr->startclk || 784 !cqr->stopclk || !cqr->endclk || 785 !sectors) 786 return; 787 788 strtime = ((cqr->startclk - cqr->buildclk) >> 12); 789 irqtime = ((cqr->stopclk - cqr->startclk) >> 12); 790 endtime = ((cqr->endclk - cqr->stopclk) >> 12); 791 tottime = ((cqr->endclk - cqr->buildclk) >> 12); 792 tottimeps = tottime / sectors; 793 794 dasd_profile_counter(sectors, sectors_ind); 795 dasd_profile_counter(tottime, tottime_ind); 796 dasd_profile_counter(tottimeps, tottimeps_ind); 797 dasd_profile_counter(strtime, strtime_ind); 798 dasd_profile_counter(irqtime, irqtime_ind); 799 dasd_profile_counter(irqtime / sectors, irqtimeps_ind); 800 dasd_profile_counter(endtime, endtime_ind); 801 802 if (dasd_global_profile_level) { 803 dasd_profile_end_add_data(&dasd_global_profile_data, 804 cqr->startdev != block->base, 805 cqr->cpmode == 1, 806 rq_data_dir(req) == READ, 807 sectors, sectors_ind, tottime_ind, 808 tottimeps_ind, strtime_ind, 809 irqtime_ind, irqtimeps_ind, 810 endtime_ind); 811 } 812 813 spin_lock(&block->profile.lock); 814 if (block->profile.data) 815 dasd_profile_end_add_data(block->profile.data, 816 cqr->startdev != block->base, 817 cqr->cpmode == 1, 818 rq_data_dir(req) == READ, 819 sectors, sectors_ind, tottime_ind, 820 tottimeps_ind, strtime_ind, 821 irqtime_ind, irqtimeps_ind, 822 endtime_ind); 823 spin_unlock(&block->profile.lock); 824 825 spin_lock(&device->profile.lock); 826 if (device->profile.data) 827 dasd_profile_end_add_data(device->profile.data, 828 cqr->startdev != block->base, 829 cqr->cpmode == 1, 830 rq_data_dir(req) == READ, 831 sectors, sectors_ind, tottime_ind, 832 tottimeps_ind, strtime_ind, 833 irqtime_ind, irqtimeps_ind, 834 endtime_ind); 835 spin_unlock(&device->profile.lock); 836 } 837 838 void dasd_profile_reset(struct dasd_profile *profile) 839 { 840 struct dasd_profile_info *data; 841 842 spin_lock_bh(&profile->lock); 843 data = profile->data; 844 if (!data) { 845 spin_unlock_bh(&profile->lock); 846 return; 847 } 848 memset(data, 0, sizeof(*data)); 849 getnstimeofday(&data->starttod); 850 spin_unlock_bh(&profile->lock); 851 } 852 853 void dasd_global_profile_reset(void) 854 { 855 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data)); 856 getnstimeofday(&dasd_global_profile_data.starttod); 857 } 858 859 int dasd_profile_on(struct dasd_profile *profile) 860 { 861 struct dasd_profile_info *data; 862 863 data = kzalloc(sizeof(*data), GFP_KERNEL); 864 if (!data) 865 return -ENOMEM; 866 spin_lock_bh(&profile->lock); 867 if (profile->data) { 868 spin_unlock_bh(&profile->lock); 869 kfree(data); 870 return 0; 871 } 872 getnstimeofday(&data->starttod); 873 profile->data = data; 874 spin_unlock_bh(&profile->lock); 875 return 0; 876 } 877 878 void dasd_profile_off(struct dasd_profile *profile) 879 { 880 spin_lock_bh(&profile->lock); 881 kfree(profile->data); 882 profile->data = NULL; 883 spin_unlock_bh(&profile->lock); 884 } 885 886 char *dasd_get_user_string(const char __user *user_buf, size_t user_len) 887 { 888 char *buffer; 889 890 buffer = vmalloc(user_len + 1); 891 if (buffer == NULL) 892 return ERR_PTR(-ENOMEM); 893 if (copy_from_user(buffer, user_buf, user_len) != 0) { 894 vfree(buffer); 895 return ERR_PTR(-EFAULT); 896 } 897 /* got the string, now strip linefeed. */ 898 if (buffer[user_len - 1] == '\n') 899 buffer[user_len - 1] = 0; 900 else 901 buffer[user_len] = 0; 902 return buffer; 903 } 904 905 static ssize_t dasd_stats_write(struct file *file, 906 const char __user *user_buf, 907 size_t user_len, loff_t *pos) 908 { 909 char *buffer, *str; 910 int rc; 911 struct seq_file *m = (struct seq_file *)file->private_data; 912 struct dasd_profile *prof = m->private; 913 914 if (user_len > 65536) 915 user_len = 65536; 916 buffer = dasd_get_user_string(user_buf, user_len); 917 if (IS_ERR(buffer)) 918 return PTR_ERR(buffer); 919 920 str = skip_spaces(buffer); 921 rc = user_len; 922 if (strncmp(str, "reset", 5) == 0) { 923 dasd_profile_reset(prof); 924 } else if (strncmp(str, "on", 2) == 0) { 925 rc = dasd_profile_on(prof); 926 if (!rc) 927 rc = user_len; 928 } else if (strncmp(str, "off", 3) == 0) { 929 dasd_profile_off(prof); 930 } else 931 rc = -EINVAL; 932 vfree(buffer); 933 return rc; 934 } 935 936 static void dasd_stats_array(struct seq_file *m, unsigned int *array) 937 { 938 int i; 939 940 for (i = 0; i < 32; i++) 941 seq_printf(m, "%u ", array[i]); 942 seq_putc(m, '\n'); 943 } 944 945 static void dasd_stats_seq_print(struct seq_file *m, 946 struct dasd_profile_info *data) 947 { 948 seq_printf(m, "start_time %ld.%09ld\n", 949 data->starttod.tv_sec, data->starttod.tv_nsec); 950 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); 951 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); 952 seq_printf(m, "total_pav %u\n", data->dasd_io_alias); 953 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); 954 seq_printf(m, "histogram_sectors "); 955 dasd_stats_array(m, data->dasd_io_secs); 956 seq_printf(m, "histogram_io_times "); 957 dasd_stats_array(m, data->dasd_io_times); 958 seq_printf(m, "histogram_io_times_weighted "); 959 dasd_stats_array(m, data->dasd_io_timps); 960 seq_printf(m, "histogram_time_build_to_ssch "); 961 dasd_stats_array(m, data->dasd_io_time1); 962 seq_printf(m, "histogram_time_ssch_to_irq "); 963 dasd_stats_array(m, data->dasd_io_time2); 964 seq_printf(m, "histogram_time_ssch_to_irq_weighted "); 965 dasd_stats_array(m, data->dasd_io_time2ps); 966 seq_printf(m, "histogram_time_irq_to_end "); 967 dasd_stats_array(m, data->dasd_io_time3); 968 seq_printf(m, "histogram_ccw_queue_length "); 969 dasd_stats_array(m, data->dasd_io_nr_req); 970 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); 971 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); 972 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); 973 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); 974 seq_printf(m, "histogram_read_sectors "); 975 dasd_stats_array(m, data->dasd_read_secs); 976 seq_printf(m, "histogram_read_times "); 977 dasd_stats_array(m, data->dasd_read_times); 978 seq_printf(m, "histogram_read_time_build_to_ssch "); 979 dasd_stats_array(m, data->dasd_read_time1); 980 seq_printf(m, "histogram_read_time_ssch_to_irq "); 981 dasd_stats_array(m, data->dasd_read_time2); 982 seq_printf(m, "histogram_read_time_irq_to_end "); 983 dasd_stats_array(m, data->dasd_read_time3); 984 seq_printf(m, "histogram_read_ccw_queue_length "); 985 dasd_stats_array(m, data->dasd_read_nr_req); 986 } 987 988 static int dasd_stats_show(struct seq_file *m, void *v) 989 { 990 struct dasd_profile *profile; 991 struct dasd_profile_info *data; 992 993 profile = m->private; 994 spin_lock_bh(&profile->lock); 995 data = profile->data; 996 if (!data) { 997 spin_unlock_bh(&profile->lock); 998 seq_printf(m, "disabled\n"); 999 return 0; 1000 } 1001 dasd_stats_seq_print(m, data); 1002 spin_unlock_bh(&profile->lock); 1003 return 0; 1004 } 1005 1006 static int dasd_stats_open(struct inode *inode, struct file *file) 1007 { 1008 struct dasd_profile *profile = inode->i_private; 1009 return single_open(file, dasd_stats_show, profile); 1010 } 1011 1012 static const struct file_operations dasd_stats_raw_fops = { 1013 .owner = THIS_MODULE, 1014 .open = dasd_stats_open, 1015 .read = seq_read, 1016 .llseek = seq_lseek, 1017 .release = single_release, 1018 .write = dasd_stats_write, 1019 }; 1020 1021 static ssize_t dasd_stats_global_write(struct file *file, 1022 const char __user *user_buf, 1023 size_t user_len, loff_t *pos) 1024 { 1025 char *buffer, *str; 1026 ssize_t rc; 1027 1028 if (user_len > 65536) 1029 user_len = 65536; 1030 buffer = dasd_get_user_string(user_buf, user_len); 1031 if (IS_ERR(buffer)) 1032 return PTR_ERR(buffer); 1033 str = skip_spaces(buffer); 1034 rc = user_len; 1035 if (strncmp(str, "reset", 5) == 0) { 1036 dasd_global_profile_reset(); 1037 } else if (strncmp(str, "on", 2) == 0) { 1038 dasd_global_profile_reset(); 1039 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; 1040 } else if (strncmp(str, "off", 3) == 0) { 1041 dasd_global_profile_level = DASD_PROFILE_OFF; 1042 } else 1043 rc = -EINVAL; 1044 vfree(buffer); 1045 return rc; 1046 } 1047 1048 static int dasd_stats_global_show(struct seq_file *m, void *v) 1049 { 1050 if (!dasd_global_profile_level) { 1051 seq_printf(m, "disabled\n"); 1052 return 0; 1053 } 1054 dasd_stats_seq_print(m, &dasd_global_profile_data); 1055 return 0; 1056 } 1057 1058 static int dasd_stats_global_open(struct inode *inode, struct file *file) 1059 { 1060 return single_open(file, dasd_stats_global_show, NULL); 1061 } 1062 1063 static const struct file_operations dasd_stats_global_fops = { 1064 .owner = THIS_MODULE, 1065 .open = dasd_stats_global_open, 1066 .read = seq_read, 1067 .llseek = seq_lseek, 1068 .release = single_release, 1069 .write = dasd_stats_global_write, 1070 }; 1071 1072 static void dasd_profile_init(struct dasd_profile *profile, 1073 struct dentry *base_dentry) 1074 { 1075 umode_t mode; 1076 struct dentry *pde; 1077 1078 if (!base_dentry) 1079 return; 1080 profile->dentry = NULL; 1081 profile->data = NULL; 1082 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1083 pde = debugfs_create_file("statistics", mode, base_dentry, 1084 profile, &dasd_stats_raw_fops); 1085 if (pde && !IS_ERR(pde)) 1086 profile->dentry = pde; 1087 return; 1088 } 1089 1090 static void dasd_profile_exit(struct dasd_profile *profile) 1091 { 1092 dasd_profile_off(profile); 1093 if (profile->dentry) { 1094 debugfs_remove(profile->dentry); 1095 profile->dentry = NULL; 1096 } 1097 } 1098 1099 static void dasd_statistics_removeroot(void) 1100 { 1101 dasd_global_profile_level = DASD_PROFILE_OFF; 1102 if (dasd_global_profile_dentry) { 1103 debugfs_remove(dasd_global_profile_dentry); 1104 dasd_global_profile_dentry = NULL; 1105 } 1106 if (dasd_debugfs_global_entry) 1107 debugfs_remove(dasd_debugfs_global_entry); 1108 if (dasd_debugfs_root_entry) 1109 debugfs_remove(dasd_debugfs_root_entry); 1110 } 1111 1112 static void dasd_statistics_createroot(void) 1113 { 1114 umode_t mode; 1115 struct dentry *pde; 1116 1117 dasd_debugfs_root_entry = NULL; 1118 dasd_debugfs_global_entry = NULL; 1119 dasd_global_profile_dentry = NULL; 1120 pde = debugfs_create_dir("dasd", NULL); 1121 if (!pde || IS_ERR(pde)) 1122 goto error; 1123 dasd_debugfs_root_entry = pde; 1124 pde = debugfs_create_dir("global", dasd_debugfs_root_entry); 1125 if (!pde || IS_ERR(pde)) 1126 goto error; 1127 dasd_debugfs_global_entry = pde; 1128 1129 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1130 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, 1131 NULL, &dasd_stats_global_fops); 1132 if (!pde || IS_ERR(pde)) 1133 goto error; 1134 dasd_global_profile_dentry = pde; 1135 return; 1136 1137 error: 1138 DBF_EVENT(DBF_ERR, "%s", 1139 "Creation of the dasd debugfs interface failed"); 1140 dasd_statistics_removeroot(); 1141 return; 1142 } 1143 1144 #else 1145 #define dasd_profile_start(block, cqr, req) do {} while (0) 1146 #define dasd_profile_end(block, cqr, req) do {} while (0) 1147 1148 static void dasd_statistics_createroot(void) 1149 { 1150 return; 1151 } 1152 1153 static void dasd_statistics_removeroot(void) 1154 { 1155 return; 1156 } 1157 1158 int dasd_stats_generic_show(struct seq_file *m, void *v) 1159 { 1160 seq_printf(m, "Statistics are not activated in this kernel\n"); 1161 return 0; 1162 } 1163 1164 static void dasd_profile_init(struct dasd_profile *profile, 1165 struct dentry *base_dentry) 1166 { 1167 return; 1168 } 1169 1170 static void dasd_profile_exit(struct dasd_profile *profile) 1171 { 1172 return; 1173 } 1174 1175 int dasd_profile_on(struct dasd_profile *profile) 1176 { 1177 return 0; 1178 } 1179 1180 #endif /* CONFIG_DASD_PROFILE */ 1181 1182 /* 1183 * Allocate memory for a channel program with 'cplength' channel 1184 * command words and 'datasize' additional space. There are two 1185 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed 1186 * memory and 2) dasd_smalloc_request uses the static ccw memory 1187 * that gets allocated for each device. 1188 */ 1189 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, 1190 int datasize, 1191 struct dasd_device *device) 1192 { 1193 struct dasd_ccw_req *cqr; 1194 1195 /* Sanity checks */ 1196 BUG_ON(datasize > PAGE_SIZE || 1197 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 1198 1199 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); 1200 if (cqr == NULL) 1201 return ERR_PTR(-ENOMEM); 1202 cqr->cpaddr = NULL; 1203 if (cplength > 0) { 1204 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), 1205 GFP_ATOMIC | GFP_DMA); 1206 if (cqr->cpaddr == NULL) { 1207 kfree(cqr); 1208 return ERR_PTR(-ENOMEM); 1209 } 1210 } 1211 cqr->data = NULL; 1212 if (datasize > 0) { 1213 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); 1214 if (cqr->data == NULL) { 1215 kfree(cqr->cpaddr); 1216 kfree(cqr); 1217 return ERR_PTR(-ENOMEM); 1218 } 1219 } 1220 cqr->magic = magic; 1221 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1222 dasd_get_device(device); 1223 return cqr; 1224 } 1225 1226 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, 1227 int datasize, 1228 struct dasd_device *device) 1229 { 1230 unsigned long flags; 1231 struct dasd_ccw_req *cqr; 1232 char *data; 1233 int size; 1234 1235 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 1236 if (cplength > 0) 1237 size += cplength * sizeof(struct ccw1); 1238 if (datasize > 0) 1239 size += datasize; 1240 spin_lock_irqsave(&device->mem_lock, flags); 1241 cqr = (struct dasd_ccw_req *) 1242 dasd_alloc_chunk(&device->ccw_chunks, size); 1243 spin_unlock_irqrestore(&device->mem_lock, flags); 1244 if (cqr == NULL) 1245 return ERR_PTR(-ENOMEM); 1246 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 1247 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 1248 cqr->cpaddr = NULL; 1249 if (cplength > 0) { 1250 cqr->cpaddr = (struct ccw1 *) data; 1251 data += cplength*sizeof(struct ccw1); 1252 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 1253 } 1254 cqr->data = NULL; 1255 if (datasize > 0) { 1256 cqr->data = data; 1257 memset(cqr->data, 0, datasize); 1258 } 1259 cqr->magic = magic; 1260 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1261 dasd_get_device(device); 1262 return cqr; 1263 } 1264 1265 /* 1266 * Free memory of a channel program. This function needs to free all the 1267 * idal lists that might have been created by dasd_set_cda and the 1268 * struct dasd_ccw_req itself. 1269 */ 1270 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1271 { 1272 #ifdef CONFIG_64BIT 1273 struct ccw1 *ccw; 1274 1275 /* Clear any idals used for the request. */ 1276 ccw = cqr->cpaddr; 1277 do { 1278 clear_normalized_cda(ccw); 1279 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); 1280 #endif 1281 kfree(cqr->cpaddr); 1282 kfree(cqr->data); 1283 kfree(cqr); 1284 dasd_put_device(device); 1285 } 1286 1287 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1288 { 1289 unsigned long flags; 1290 1291 spin_lock_irqsave(&device->mem_lock, flags); 1292 dasd_free_chunk(&device->ccw_chunks, cqr); 1293 spin_unlock_irqrestore(&device->mem_lock, flags); 1294 dasd_put_device(device); 1295 } 1296 1297 /* 1298 * Check discipline magic in cqr. 1299 */ 1300 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) 1301 { 1302 struct dasd_device *device; 1303 1304 if (cqr == NULL) 1305 return -EINVAL; 1306 device = cqr->startdev; 1307 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { 1308 DBF_DEV_EVENT(DBF_WARNING, device, 1309 " dasd_ccw_req 0x%08x magic doesn't match" 1310 " discipline 0x%08x", 1311 cqr->magic, 1312 *(unsigned int *) device->discipline->name); 1313 return -EINVAL; 1314 } 1315 return 0; 1316 } 1317 1318 /* 1319 * Terminate the current i/o and set the request to clear_pending. 1320 * Timer keeps device runnig. 1321 * ccw_device_clear can fail if the i/o subsystem 1322 * is in a bad mood. 1323 */ 1324 int dasd_term_IO(struct dasd_ccw_req *cqr) 1325 { 1326 struct dasd_device *device; 1327 int retries, rc; 1328 char errorstring[ERRORLENGTH]; 1329 1330 /* Check the cqr */ 1331 rc = dasd_check_cqr(cqr); 1332 if (rc) 1333 return rc; 1334 retries = 0; 1335 device = (struct dasd_device *) cqr->startdev; 1336 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { 1337 rc = ccw_device_clear(device->cdev, (long) cqr); 1338 switch (rc) { 1339 case 0: /* termination successful */ 1340 cqr->status = DASD_CQR_CLEAR_PENDING; 1341 cqr->stopclk = get_clock(); 1342 cqr->starttime = 0; 1343 DBF_DEV_EVENT(DBF_DEBUG, device, 1344 "terminate cqr %p successful", 1345 cqr); 1346 break; 1347 case -ENODEV: 1348 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1349 "device gone, retry"); 1350 break; 1351 case -EIO: 1352 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1353 "I/O error, retry"); 1354 break; 1355 case -EINVAL: 1356 case -EBUSY: 1357 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1358 "device busy, retry later"); 1359 break; 1360 default: 1361 /* internal error 10 - unknown rc*/ 1362 snprintf(errorstring, ERRORLENGTH, "10 %d", rc); 1363 dev_err(&device->cdev->dev, "An error occurred in the " 1364 "DASD device driver, reason=%s\n", errorstring); 1365 BUG(); 1366 break; 1367 } 1368 retries++; 1369 } 1370 dasd_schedule_device_bh(device); 1371 return rc; 1372 } 1373 1374 /* 1375 * Start the i/o. This start_IO can fail if the channel is really busy. 1376 * In that case set up a timer to start the request later. 1377 */ 1378 int dasd_start_IO(struct dasd_ccw_req *cqr) 1379 { 1380 struct dasd_device *device; 1381 int rc; 1382 char errorstring[ERRORLENGTH]; 1383 1384 /* Check the cqr */ 1385 rc = dasd_check_cqr(cqr); 1386 if (rc) { 1387 cqr->intrc = rc; 1388 return rc; 1389 } 1390 device = (struct dasd_device *) cqr->startdev; 1391 if (((cqr->block && 1392 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || 1393 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && 1394 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 1395 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " 1396 "because of stolen lock", cqr); 1397 cqr->status = DASD_CQR_ERROR; 1398 cqr->intrc = -EPERM; 1399 return -EPERM; 1400 } 1401 if (cqr->retries < 0) { 1402 /* internal error 14 - start_IO run out of retries */ 1403 sprintf(errorstring, "14 %p", cqr); 1404 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1405 "device driver, reason=%s\n", errorstring); 1406 cqr->status = DASD_CQR_ERROR; 1407 return -EIO; 1408 } 1409 cqr->startclk = get_clock(); 1410 cqr->starttime = jiffies; 1411 cqr->retries--; 1412 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1413 cqr->lpm &= device->path_data.opm; 1414 if (!cqr->lpm) 1415 cqr->lpm = device->path_data.opm; 1416 } 1417 if (cqr->cpmode == 1) { 1418 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, 1419 (long) cqr, cqr->lpm); 1420 } else { 1421 rc = ccw_device_start(device->cdev, cqr->cpaddr, 1422 (long) cqr, cqr->lpm, 0); 1423 } 1424 switch (rc) { 1425 case 0: 1426 cqr->status = DASD_CQR_IN_IO; 1427 break; 1428 case -EBUSY: 1429 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1430 "start_IO: device busy, retry later"); 1431 break; 1432 case -ETIMEDOUT: 1433 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1434 "start_IO: request timeout, retry later"); 1435 break; 1436 case -EACCES: 1437 /* -EACCES indicates that the request used only a subset of the 1438 * available paths and all these paths are gone. If the lpm of 1439 * this request was only a subset of the opm (e.g. the ppm) then 1440 * we just do a retry with all available paths. 1441 * If we already use the full opm, something is amiss, and we 1442 * need a full path verification. 1443 */ 1444 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1445 DBF_DEV_EVENT(DBF_WARNING, device, 1446 "start_IO: selected paths gone (%x)", 1447 cqr->lpm); 1448 } else if (cqr->lpm != device->path_data.opm) { 1449 cqr->lpm = device->path_data.opm; 1450 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 1451 "start_IO: selected paths gone," 1452 " retry on all paths"); 1453 } else { 1454 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1455 "start_IO: all paths in opm gone," 1456 " do path verification"); 1457 dasd_generic_last_path_gone(device); 1458 device->path_data.opm = 0; 1459 device->path_data.ppm = 0; 1460 device->path_data.npm = 0; 1461 device->path_data.tbvpm = 1462 ccw_device_get_path_mask(device->cdev); 1463 } 1464 break; 1465 case -ENODEV: 1466 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1467 "start_IO: -ENODEV device gone, retry"); 1468 break; 1469 case -EIO: 1470 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1471 "start_IO: -EIO device gone, retry"); 1472 break; 1473 case -EINVAL: 1474 /* most likely caused in power management context */ 1475 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1476 "start_IO: -EINVAL device currently " 1477 "not accessible"); 1478 break; 1479 default: 1480 /* internal error 11 - unknown rc */ 1481 snprintf(errorstring, ERRORLENGTH, "11 %d", rc); 1482 dev_err(&device->cdev->dev, 1483 "An error occurred in the DASD device driver, " 1484 "reason=%s\n", errorstring); 1485 BUG(); 1486 break; 1487 } 1488 cqr->intrc = rc; 1489 return rc; 1490 } 1491 1492 /* 1493 * Timeout function for dasd devices. This is used for different purposes 1494 * 1) missing interrupt handler for normal operation 1495 * 2) delayed start of request where start_IO failed with -EBUSY 1496 * 3) timeout for missing state change interrupts 1497 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), 1498 * DASD_CQR_QUEUED for 2) and 3). 1499 */ 1500 static void dasd_device_timeout(unsigned long ptr) 1501 { 1502 unsigned long flags; 1503 struct dasd_device *device; 1504 1505 device = (struct dasd_device *) ptr; 1506 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 1507 /* re-activate request queue */ 1508 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1509 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 1510 dasd_schedule_device_bh(device); 1511 } 1512 1513 /* 1514 * Setup timeout for a device in jiffies. 1515 */ 1516 void dasd_device_set_timer(struct dasd_device *device, int expires) 1517 { 1518 if (expires == 0) 1519 del_timer(&device->timer); 1520 else 1521 mod_timer(&device->timer, jiffies + expires); 1522 } 1523 1524 /* 1525 * Clear timeout for a device. 1526 */ 1527 void dasd_device_clear_timer(struct dasd_device *device) 1528 { 1529 del_timer(&device->timer); 1530 } 1531 1532 static void dasd_handle_killed_request(struct ccw_device *cdev, 1533 unsigned long intparm) 1534 { 1535 struct dasd_ccw_req *cqr; 1536 struct dasd_device *device; 1537 1538 if (!intparm) 1539 return; 1540 cqr = (struct dasd_ccw_req *) intparm; 1541 if (cqr->status != DASD_CQR_IN_IO) { 1542 DBF_EVENT_DEVID(DBF_DEBUG, cdev, 1543 "invalid status in handle_killed_request: " 1544 "%02x", cqr->status); 1545 return; 1546 } 1547 1548 device = dasd_device_from_cdev_locked(cdev); 1549 if (IS_ERR(device)) { 1550 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1551 "unable to get device from cdev"); 1552 return; 1553 } 1554 1555 if (!cqr->startdev || 1556 device != cqr->startdev || 1557 strncmp(cqr->startdev->discipline->ebcname, 1558 (char *) &cqr->magic, 4)) { 1559 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1560 "invalid device in request"); 1561 dasd_put_device(device); 1562 return; 1563 } 1564 1565 /* Schedule request to be retried. */ 1566 cqr->status = DASD_CQR_QUEUED; 1567 1568 dasd_device_clear_timer(device); 1569 dasd_schedule_device_bh(device); 1570 dasd_put_device(device); 1571 } 1572 1573 void dasd_generic_handle_state_change(struct dasd_device *device) 1574 { 1575 /* First of all start sense subsystem status request. */ 1576 dasd_eer_snss(device); 1577 1578 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1579 dasd_schedule_device_bh(device); 1580 if (device->block) 1581 dasd_schedule_block_bh(device->block); 1582 } 1583 1584 /* 1585 * Interrupt handler for "normal" ssch-io based dasd devices. 1586 */ 1587 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 1588 struct irb *irb) 1589 { 1590 struct dasd_ccw_req *cqr, *next; 1591 struct dasd_device *device; 1592 unsigned long long now; 1593 int expires; 1594 1595 if (IS_ERR(irb)) { 1596 switch (PTR_ERR(irb)) { 1597 case -EIO: 1598 break; 1599 case -ETIMEDOUT: 1600 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1601 "request timed out\n", __func__); 1602 break; 1603 default: 1604 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1605 "unknown error %ld\n", __func__, 1606 PTR_ERR(irb)); 1607 } 1608 dasd_handle_killed_request(cdev, intparm); 1609 return; 1610 } 1611 1612 now = get_clock(); 1613 cqr = (struct dasd_ccw_req *) intparm; 1614 /* check for conditions that should be handled immediately */ 1615 if (!cqr || 1616 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1617 scsw_cstat(&irb->scsw) == 0)) { 1618 if (cqr) 1619 memcpy(&cqr->irb, irb, sizeof(*irb)); 1620 device = dasd_device_from_cdev_locked(cdev); 1621 if (IS_ERR(device)) 1622 return; 1623 /* ignore unsolicited interrupts for DIAG discipline */ 1624 if (device->discipline == dasd_diag_discipline_pointer) { 1625 dasd_put_device(device); 1626 return; 1627 } 1628 device->discipline->dump_sense_dbf(device, irb, "int"); 1629 if (device->features & DASD_FEATURE_ERPLOG) 1630 device->discipline->dump_sense(device, cqr, irb); 1631 device->discipline->check_for_device_change(device, cqr, irb); 1632 dasd_put_device(device); 1633 } 1634 if (!cqr) 1635 return; 1636 1637 device = (struct dasd_device *) cqr->startdev; 1638 if (!device || 1639 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 1640 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1641 "invalid device in request"); 1642 return; 1643 } 1644 1645 /* Check for clear pending */ 1646 if (cqr->status == DASD_CQR_CLEAR_PENDING && 1647 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { 1648 cqr->status = DASD_CQR_CLEARED; 1649 dasd_device_clear_timer(device); 1650 wake_up(&dasd_flush_wq); 1651 dasd_schedule_device_bh(device); 1652 return; 1653 } 1654 1655 /* check status - the request might have been killed by dyn detach */ 1656 if (cqr->status != DASD_CQR_IN_IO) { 1657 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " 1658 "status %02x", dev_name(&cdev->dev), cqr->status); 1659 return; 1660 } 1661 1662 next = NULL; 1663 expires = 0; 1664 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1665 scsw_cstat(&irb->scsw) == 0) { 1666 /* request was completed successfully */ 1667 cqr->status = DASD_CQR_SUCCESS; 1668 cqr->stopclk = now; 1669 /* Start first request on queue if possible -> fast_io. */ 1670 if (cqr->devlist.next != &device->ccw_queue) { 1671 next = list_entry(cqr->devlist.next, 1672 struct dasd_ccw_req, devlist); 1673 } 1674 } else { /* error */ 1675 /* 1676 * If we don't want complex ERP for this request, then just 1677 * reset this and retry it in the fastpath 1678 */ 1679 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && 1680 cqr->retries > 0) { 1681 if (cqr->lpm == device->path_data.opm) 1682 DBF_DEV_EVENT(DBF_DEBUG, device, 1683 "default ERP in fastpath " 1684 "(%i retries left)", 1685 cqr->retries); 1686 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 1687 cqr->lpm = device->path_data.opm; 1688 cqr->status = DASD_CQR_QUEUED; 1689 next = cqr; 1690 } else 1691 cqr->status = DASD_CQR_ERROR; 1692 } 1693 if (next && (next->status == DASD_CQR_QUEUED) && 1694 (!device->stopped)) { 1695 if (device->discipline->start_IO(next) == 0) 1696 expires = next->expires; 1697 } 1698 if (expires != 0) 1699 dasd_device_set_timer(device, expires); 1700 else 1701 dasd_device_clear_timer(device); 1702 dasd_schedule_device_bh(device); 1703 } 1704 1705 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) 1706 { 1707 struct dasd_device *device; 1708 1709 device = dasd_device_from_cdev_locked(cdev); 1710 1711 if (IS_ERR(device)) 1712 goto out; 1713 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1714 device->state != device->target || 1715 !device->discipline->check_for_device_change){ 1716 dasd_put_device(device); 1717 goto out; 1718 } 1719 if (device->discipline->dump_sense_dbf) 1720 device->discipline->dump_sense_dbf(device, irb, "uc"); 1721 device->discipline->check_for_device_change(device, NULL, irb); 1722 dasd_put_device(device); 1723 out: 1724 return UC_TODO_RETRY; 1725 } 1726 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); 1727 1728 /* 1729 * If we have an error on a dasd_block layer request then we cancel 1730 * and return all further requests from the same dasd_block as well. 1731 */ 1732 static void __dasd_device_recovery(struct dasd_device *device, 1733 struct dasd_ccw_req *ref_cqr) 1734 { 1735 struct list_head *l, *n; 1736 struct dasd_ccw_req *cqr; 1737 1738 /* 1739 * only requeue request that came from the dasd_block layer 1740 */ 1741 if (!ref_cqr->block) 1742 return; 1743 1744 list_for_each_safe(l, n, &device->ccw_queue) { 1745 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1746 if (cqr->status == DASD_CQR_QUEUED && 1747 ref_cqr->block == cqr->block) { 1748 cqr->status = DASD_CQR_CLEARED; 1749 } 1750 } 1751 }; 1752 1753 /* 1754 * Remove those ccw requests from the queue that need to be returned 1755 * to the upper layer. 1756 */ 1757 static void __dasd_device_process_ccw_queue(struct dasd_device *device, 1758 struct list_head *final_queue) 1759 { 1760 struct list_head *l, *n; 1761 struct dasd_ccw_req *cqr; 1762 1763 /* Process request with final status. */ 1764 list_for_each_safe(l, n, &device->ccw_queue) { 1765 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1766 1767 /* Stop list processing at the first non-final request. */ 1768 if (cqr->status == DASD_CQR_QUEUED || 1769 cqr->status == DASD_CQR_IN_IO || 1770 cqr->status == DASD_CQR_CLEAR_PENDING) 1771 break; 1772 if (cqr->status == DASD_CQR_ERROR) { 1773 __dasd_device_recovery(device, cqr); 1774 } 1775 /* Rechain finished requests to final queue */ 1776 list_move_tail(&cqr->devlist, final_queue); 1777 } 1778 } 1779 1780 /* 1781 * the cqrs from the final queue are returned to the upper layer 1782 * by setting a dasd_block state and calling the callback function 1783 */ 1784 static void __dasd_device_process_final_queue(struct dasd_device *device, 1785 struct list_head *final_queue) 1786 { 1787 struct list_head *l, *n; 1788 struct dasd_ccw_req *cqr; 1789 struct dasd_block *block; 1790 void (*callback)(struct dasd_ccw_req *, void *data); 1791 void *callback_data; 1792 char errorstring[ERRORLENGTH]; 1793 1794 list_for_each_safe(l, n, final_queue) { 1795 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1796 list_del_init(&cqr->devlist); 1797 block = cqr->block; 1798 callback = cqr->callback; 1799 callback_data = cqr->callback_data; 1800 if (block) 1801 spin_lock_bh(&block->queue_lock); 1802 switch (cqr->status) { 1803 case DASD_CQR_SUCCESS: 1804 cqr->status = DASD_CQR_DONE; 1805 break; 1806 case DASD_CQR_ERROR: 1807 cqr->status = DASD_CQR_NEED_ERP; 1808 break; 1809 case DASD_CQR_CLEARED: 1810 cqr->status = DASD_CQR_TERMINATED; 1811 break; 1812 default: 1813 /* internal error 12 - wrong cqr status*/ 1814 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); 1815 dev_err(&device->cdev->dev, 1816 "An error occurred in the DASD device driver, " 1817 "reason=%s\n", errorstring); 1818 BUG(); 1819 } 1820 if (cqr->callback != NULL) 1821 (callback)(cqr, callback_data); 1822 if (block) 1823 spin_unlock_bh(&block->queue_lock); 1824 } 1825 } 1826 1827 /* 1828 * Take a look at the first request on the ccw queue and check 1829 * if it reached its expire time. If so, terminate the IO. 1830 */ 1831 static void __dasd_device_check_expire(struct dasd_device *device) 1832 { 1833 struct dasd_ccw_req *cqr; 1834 1835 if (list_empty(&device->ccw_queue)) 1836 return; 1837 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1838 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && 1839 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { 1840 if (device->discipline->term_IO(cqr) != 0) { 1841 /* Hmpf, try again in 5 sec */ 1842 dev_err(&device->cdev->dev, 1843 "cqr %p timed out (%lus) but cannot be " 1844 "ended, retrying in 5 s\n", 1845 cqr, (cqr->expires/HZ)); 1846 cqr->expires += 5*HZ; 1847 dasd_device_set_timer(device, 5*HZ); 1848 } else { 1849 dev_err(&device->cdev->dev, 1850 "cqr %p timed out (%lus), %i retries " 1851 "remaining\n", cqr, (cqr->expires/HZ), 1852 cqr->retries); 1853 } 1854 } 1855 } 1856 1857 /* 1858 * Take a look at the first request on the ccw queue and check 1859 * if it needs to be started. 1860 */ 1861 static void __dasd_device_start_head(struct dasd_device *device) 1862 { 1863 struct dasd_ccw_req *cqr; 1864 int rc; 1865 1866 if (list_empty(&device->ccw_queue)) 1867 return; 1868 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1869 if (cqr->status != DASD_CQR_QUEUED) 1870 return; 1871 /* when device is stopped, return request to previous layer 1872 * exception: only the disconnect or unresumed bits are set and the 1873 * cqr is a path verification request 1874 */ 1875 if (device->stopped && 1876 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) 1877 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { 1878 cqr->intrc = -EAGAIN; 1879 cqr->status = DASD_CQR_CLEARED; 1880 dasd_schedule_device_bh(device); 1881 return; 1882 } 1883 1884 rc = device->discipline->start_IO(cqr); 1885 if (rc == 0) 1886 dasd_device_set_timer(device, cqr->expires); 1887 else if (rc == -EACCES) { 1888 dasd_schedule_device_bh(device); 1889 } else 1890 /* Hmpf, try again in 1/2 sec */ 1891 dasd_device_set_timer(device, 50); 1892 } 1893 1894 static void __dasd_device_check_path_events(struct dasd_device *device) 1895 { 1896 int rc; 1897 1898 if (device->path_data.tbvpm) { 1899 if (device->stopped & ~(DASD_STOPPED_DC_WAIT | 1900 DASD_UNRESUMED_PM)) 1901 return; 1902 rc = device->discipline->verify_path( 1903 device, device->path_data.tbvpm); 1904 if (rc) 1905 dasd_device_set_timer(device, 50); 1906 else 1907 device->path_data.tbvpm = 0; 1908 } 1909 }; 1910 1911 /* 1912 * Go through all request on the dasd_device request queue, 1913 * terminate them on the cdev if necessary, and return them to the 1914 * submitting layer via callback. 1915 * Note: 1916 * Make sure that all 'submitting layers' still exist when 1917 * this function is called!. In other words, when 'device' is a base 1918 * device then all block layer requests must have been removed before 1919 * via dasd_flush_block_queue. 1920 */ 1921 int dasd_flush_device_queue(struct dasd_device *device) 1922 { 1923 struct dasd_ccw_req *cqr, *n; 1924 int rc; 1925 struct list_head flush_queue; 1926 1927 INIT_LIST_HEAD(&flush_queue); 1928 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1929 rc = 0; 1930 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 1931 /* Check status and move request to flush_queue */ 1932 switch (cqr->status) { 1933 case DASD_CQR_IN_IO: 1934 rc = device->discipline->term_IO(cqr); 1935 if (rc) { 1936 /* unable to terminate requeust */ 1937 dev_err(&device->cdev->dev, 1938 "Flushing the DASD request queue " 1939 "failed for request %p\n", cqr); 1940 /* stop flush processing */ 1941 goto finished; 1942 } 1943 break; 1944 case DASD_CQR_QUEUED: 1945 cqr->stopclk = get_clock(); 1946 cqr->status = DASD_CQR_CLEARED; 1947 break; 1948 default: /* no need to modify the others */ 1949 break; 1950 } 1951 list_move_tail(&cqr->devlist, &flush_queue); 1952 } 1953 finished: 1954 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1955 /* 1956 * After this point all requests must be in state CLEAR_PENDING, 1957 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become 1958 * one of the others. 1959 */ 1960 list_for_each_entry_safe(cqr, n, &flush_queue, devlist) 1961 wait_event(dasd_flush_wq, 1962 (cqr->status != DASD_CQR_CLEAR_PENDING)); 1963 /* 1964 * Now set each request back to TERMINATED, DONE or NEED_ERP 1965 * and call the callback function of flushed requests 1966 */ 1967 __dasd_device_process_final_queue(device, &flush_queue); 1968 return rc; 1969 } 1970 1971 /* 1972 * Acquire the device lock and process queues for the device. 1973 */ 1974 static void dasd_device_tasklet(struct dasd_device *device) 1975 { 1976 struct list_head final_queue; 1977 1978 atomic_set (&device->tasklet_scheduled, 0); 1979 INIT_LIST_HEAD(&final_queue); 1980 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1981 /* Check expire time of first request on the ccw queue. */ 1982 __dasd_device_check_expire(device); 1983 /* find final requests on ccw queue */ 1984 __dasd_device_process_ccw_queue(device, &final_queue); 1985 __dasd_device_check_path_events(device); 1986 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1987 /* Now call the callback function of requests with final status */ 1988 __dasd_device_process_final_queue(device, &final_queue); 1989 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1990 /* Now check if the head of the ccw queue needs to be started. */ 1991 __dasd_device_start_head(device); 1992 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1993 dasd_put_device(device); 1994 } 1995 1996 /* 1997 * Schedules a call to dasd_tasklet over the device tasklet. 1998 */ 1999 void dasd_schedule_device_bh(struct dasd_device *device) 2000 { 2001 /* Protect against rescheduling. */ 2002 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) 2003 return; 2004 dasd_get_device(device); 2005 tasklet_hi_schedule(&device->tasklet); 2006 } 2007 2008 void dasd_device_set_stop_bits(struct dasd_device *device, int bits) 2009 { 2010 device->stopped |= bits; 2011 } 2012 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); 2013 2014 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) 2015 { 2016 device->stopped &= ~bits; 2017 if (!device->stopped) 2018 wake_up(&generic_waitq); 2019 } 2020 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); 2021 2022 /* 2023 * Queue a request to the head of the device ccw_queue. 2024 * Start the I/O if possible. 2025 */ 2026 void dasd_add_request_head(struct dasd_ccw_req *cqr) 2027 { 2028 struct dasd_device *device; 2029 unsigned long flags; 2030 2031 device = cqr->startdev; 2032 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2033 cqr->status = DASD_CQR_QUEUED; 2034 list_add(&cqr->devlist, &device->ccw_queue); 2035 /* let the bh start the request to keep them in order */ 2036 dasd_schedule_device_bh(device); 2037 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2038 } 2039 2040 /* 2041 * Queue a request to the tail of the device ccw_queue. 2042 * Start the I/O if possible. 2043 */ 2044 void dasd_add_request_tail(struct dasd_ccw_req *cqr) 2045 { 2046 struct dasd_device *device; 2047 unsigned long flags; 2048 2049 device = cqr->startdev; 2050 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2051 cqr->status = DASD_CQR_QUEUED; 2052 list_add_tail(&cqr->devlist, &device->ccw_queue); 2053 /* let the bh start the request to keep them in order */ 2054 dasd_schedule_device_bh(device); 2055 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2056 } 2057 2058 /* 2059 * Wakeup helper for the 'sleep_on' functions. 2060 */ 2061 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) 2062 { 2063 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2064 cqr->callback_data = DASD_SLEEPON_END_TAG; 2065 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2066 wake_up(&generic_waitq); 2067 } 2068 EXPORT_SYMBOL_GPL(dasd_wakeup_cb); 2069 2070 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) 2071 { 2072 struct dasd_device *device; 2073 int rc; 2074 2075 device = cqr->startdev; 2076 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2077 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); 2078 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2079 return rc; 2080 } 2081 2082 /* 2083 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. 2084 */ 2085 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) 2086 { 2087 struct dasd_device *device; 2088 dasd_erp_fn_t erp_fn; 2089 2090 if (cqr->status == DASD_CQR_FILLED) 2091 return 0; 2092 device = cqr->startdev; 2093 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2094 if (cqr->status == DASD_CQR_TERMINATED) { 2095 device->discipline->handle_terminated_request(cqr); 2096 return 1; 2097 } 2098 if (cqr->status == DASD_CQR_NEED_ERP) { 2099 erp_fn = device->discipline->erp_action(cqr); 2100 erp_fn(cqr); 2101 return 1; 2102 } 2103 if (cqr->status == DASD_CQR_FAILED) 2104 dasd_log_sense(cqr, &cqr->irb); 2105 if (cqr->refers) { 2106 __dasd_process_erp(device, cqr); 2107 return 1; 2108 } 2109 } 2110 return 0; 2111 } 2112 2113 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) 2114 { 2115 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2116 if (cqr->refers) /* erp is not done yet */ 2117 return 1; 2118 return ((cqr->status != DASD_CQR_DONE) && 2119 (cqr->status != DASD_CQR_FAILED)); 2120 } else 2121 return (cqr->status == DASD_CQR_FILLED); 2122 } 2123 2124 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) 2125 { 2126 struct dasd_device *device; 2127 int rc; 2128 struct list_head ccw_queue; 2129 struct dasd_ccw_req *cqr; 2130 2131 INIT_LIST_HEAD(&ccw_queue); 2132 maincqr->status = DASD_CQR_FILLED; 2133 device = maincqr->startdev; 2134 list_add(&maincqr->blocklist, &ccw_queue); 2135 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); 2136 cqr = list_first_entry(&ccw_queue, 2137 struct dasd_ccw_req, blocklist)) { 2138 2139 if (__dasd_sleep_on_erp(cqr)) 2140 continue; 2141 if (cqr->status != DASD_CQR_FILLED) /* could be failed */ 2142 continue; 2143 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2144 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2145 cqr->status = DASD_CQR_FAILED; 2146 cqr->intrc = -EPERM; 2147 continue; 2148 } 2149 /* Non-temporary stop condition will trigger fail fast */ 2150 if (device->stopped & ~DASD_STOPPED_PENDING && 2151 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2152 (!dasd_eer_enabled(device))) { 2153 cqr->status = DASD_CQR_FAILED; 2154 continue; 2155 } 2156 /* Don't try to start requests if device is stopped */ 2157 if (interruptible) { 2158 rc = wait_event_interruptible( 2159 generic_waitq, !(device->stopped)); 2160 if (rc == -ERESTARTSYS) { 2161 cqr->status = DASD_CQR_FAILED; 2162 maincqr->intrc = rc; 2163 continue; 2164 } 2165 } else 2166 wait_event(generic_waitq, !(device->stopped)); 2167 2168 if (!cqr->callback) 2169 cqr->callback = dasd_wakeup_cb; 2170 2171 cqr->callback_data = DASD_SLEEPON_START_TAG; 2172 dasd_add_request_tail(cqr); 2173 if (interruptible) { 2174 rc = wait_event_interruptible( 2175 generic_waitq, _wait_for_wakeup(cqr)); 2176 if (rc == -ERESTARTSYS) { 2177 dasd_cancel_req(cqr); 2178 /* wait (non-interruptible) for final status */ 2179 wait_event(generic_waitq, 2180 _wait_for_wakeup(cqr)); 2181 cqr->status = DASD_CQR_FAILED; 2182 maincqr->intrc = rc; 2183 continue; 2184 } 2185 } else 2186 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2187 } 2188 2189 maincqr->endclk = get_clock(); 2190 if ((maincqr->status != DASD_CQR_DONE) && 2191 (maincqr->intrc != -ERESTARTSYS)) 2192 dasd_log_sense(maincqr, &maincqr->irb); 2193 if (maincqr->status == DASD_CQR_DONE) 2194 rc = 0; 2195 else if (maincqr->intrc) 2196 rc = maincqr->intrc; 2197 else 2198 rc = -EIO; 2199 return rc; 2200 } 2201 2202 /* 2203 * Queue a request to the tail of the device ccw_queue and wait for 2204 * it's completion. 2205 */ 2206 int dasd_sleep_on(struct dasd_ccw_req *cqr) 2207 { 2208 return _dasd_sleep_on(cqr, 0); 2209 } 2210 2211 /* 2212 * Queue a request to the tail of the device ccw_queue and wait 2213 * interruptible for it's completion. 2214 */ 2215 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) 2216 { 2217 return _dasd_sleep_on(cqr, 1); 2218 } 2219 2220 /* 2221 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock 2222 * for eckd devices) the currently running request has to be terminated 2223 * and be put back to status queued, before the special request is added 2224 * to the head of the queue. Then the special request is waited on normally. 2225 */ 2226 static inline int _dasd_term_running_cqr(struct dasd_device *device) 2227 { 2228 struct dasd_ccw_req *cqr; 2229 int rc; 2230 2231 if (list_empty(&device->ccw_queue)) 2232 return 0; 2233 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2234 rc = device->discipline->term_IO(cqr); 2235 if (!rc) 2236 /* 2237 * CQR terminated because a more important request is pending. 2238 * Undo decreasing of retry counter because this is 2239 * not an error case. 2240 */ 2241 cqr->retries++; 2242 return rc; 2243 } 2244 2245 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) 2246 { 2247 struct dasd_device *device; 2248 int rc; 2249 2250 device = cqr->startdev; 2251 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2252 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2253 cqr->status = DASD_CQR_FAILED; 2254 cqr->intrc = -EPERM; 2255 return -EIO; 2256 } 2257 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2258 rc = _dasd_term_running_cqr(device); 2259 if (rc) { 2260 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2261 return rc; 2262 } 2263 cqr->callback = dasd_wakeup_cb; 2264 cqr->callback_data = DASD_SLEEPON_START_TAG; 2265 cqr->status = DASD_CQR_QUEUED; 2266 /* 2267 * add new request as second 2268 * first the terminated cqr needs to be finished 2269 */ 2270 list_add(&cqr->devlist, device->ccw_queue.next); 2271 2272 /* let the bh start the request to keep them in order */ 2273 dasd_schedule_device_bh(device); 2274 2275 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2276 2277 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2278 2279 if (cqr->status == DASD_CQR_DONE) 2280 rc = 0; 2281 else if (cqr->intrc) 2282 rc = cqr->intrc; 2283 else 2284 rc = -EIO; 2285 return rc; 2286 } 2287 2288 /* 2289 * Cancels a request that was started with dasd_sleep_on_req. 2290 * This is useful to timeout requests. The request will be 2291 * terminated if it is currently in i/o. 2292 * Returns 1 if the request has been terminated. 2293 * 0 if there was no need to terminate the request (not started yet) 2294 * negative error code if termination failed 2295 * Cancellation of a request is an asynchronous operation! The calling 2296 * function has to wait until the request is properly returned via callback. 2297 */ 2298 int dasd_cancel_req(struct dasd_ccw_req *cqr) 2299 { 2300 struct dasd_device *device = cqr->startdev; 2301 unsigned long flags; 2302 int rc; 2303 2304 rc = 0; 2305 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2306 switch (cqr->status) { 2307 case DASD_CQR_QUEUED: 2308 /* request was not started - just set to cleared */ 2309 cqr->status = DASD_CQR_CLEARED; 2310 break; 2311 case DASD_CQR_IN_IO: 2312 /* request in IO - terminate IO and release again */ 2313 rc = device->discipline->term_IO(cqr); 2314 if (rc) { 2315 dev_err(&device->cdev->dev, 2316 "Cancelling request %p failed with rc=%d\n", 2317 cqr, rc); 2318 } else { 2319 cqr->stopclk = get_clock(); 2320 } 2321 break; 2322 default: /* already finished or clear pending - do nothing */ 2323 break; 2324 } 2325 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2326 dasd_schedule_device_bh(device); 2327 return rc; 2328 } 2329 2330 2331 /* 2332 * SECTION: Operations of the dasd_block layer. 2333 */ 2334 2335 /* 2336 * Timeout function for dasd_block. This is used when the block layer 2337 * is waiting for something that may not come reliably, (e.g. a state 2338 * change interrupt) 2339 */ 2340 static void dasd_block_timeout(unsigned long ptr) 2341 { 2342 unsigned long flags; 2343 struct dasd_block *block; 2344 2345 block = (struct dasd_block *) ptr; 2346 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); 2347 /* re-activate request queue */ 2348 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); 2349 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); 2350 dasd_schedule_block_bh(block); 2351 } 2352 2353 /* 2354 * Setup timeout for a dasd_block in jiffies. 2355 */ 2356 void dasd_block_set_timer(struct dasd_block *block, int expires) 2357 { 2358 if (expires == 0) 2359 del_timer(&block->timer); 2360 else 2361 mod_timer(&block->timer, jiffies + expires); 2362 } 2363 2364 /* 2365 * Clear timeout for a dasd_block. 2366 */ 2367 void dasd_block_clear_timer(struct dasd_block *block) 2368 { 2369 del_timer(&block->timer); 2370 } 2371 2372 /* 2373 * Process finished error recovery ccw. 2374 */ 2375 static void __dasd_process_erp(struct dasd_device *device, 2376 struct dasd_ccw_req *cqr) 2377 { 2378 dasd_erp_fn_t erp_fn; 2379 2380 if (cqr->status == DASD_CQR_DONE) 2381 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); 2382 else 2383 dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); 2384 erp_fn = device->discipline->erp_postaction(cqr); 2385 erp_fn(cqr); 2386 } 2387 2388 /* 2389 * Fetch requests from the block device queue. 2390 */ 2391 static void __dasd_process_request_queue(struct dasd_block *block) 2392 { 2393 struct request_queue *queue; 2394 struct request *req; 2395 struct dasd_ccw_req *cqr; 2396 struct dasd_device *basedev; 2397 unsigned long flags; 2398 queue = block->request_queue; 2399 basedev = block->base; 2400 /* No queue ? Then there is nothing to do. */ 2401 if (queue == NULL) 2402 return; 2403 2404 /* 2405 * We requeue request from the block device queue to the ccw 2406 * queue only in two states. In state DASD_STATE_READY the 2407 * partition detection is done and we need to requeue requests 2408 * for that. State DASD_STATE_ONLINE is normal block device 2409 * operation. 2410 */ 2411 if (basedev->state < DASD_STATE_READY) { 2412 while ((req = blk_fetch_request(block->request_queue))) 2413 __blk_end_request_all(req, -EIO); 2414 return; 2415 } 2416 /* Now we try to fetch requests from the request queue */ 2417 while ((req = blk_peek_request(queue))) { 2418 if (basedev->features & DASD_FEATURE_READONLY && 2419 rq_data_dir(req) == WRITE) { 2420 DBF_DEV_EVENT(DBF_ERR, basedev, 2421 "Rejecting write request %p", 2422 req); 2423 blk_start_request(req); 2424 __blk_end_request_all(req, -EIO); 2425 continue; 2426 } 2427 cqr = basedev->discipline->build_cp(basedev, block, req); 2428 if (IS_ERR(cqr)) { 2429 if (PTR_ERR(cqr) == -EBUSY) 2430 break; /* normal end condition */ 2431 if (PTR_ERR(cqr) == -ENOMEM) 2432 break; /* terminate request queue loop */ 2433 if (PTR_ERR(cqr) == -EAGAIN) { 2434 /* 2435 * The current request cannot be build right 2436 * now, we have to try later. If this request 2437 * is the head-of-queue we stop the device 2438 * for 1/2 second. 2439 */ 2440 if (!list_empty(&block->ccw_queue)) 2441 break; 2442 spin_lock_irqsave( 2443 get_ccwdev_lock(basedev->cdev), flags); 2444 dasd_device_set_stop_bits(basedev, 2445 DASD_STOPPED_PENDING); 2446 spin_unlock_irqrestore( 2447 get_ccwdev_lock(basedev->cdev), flags); 2448 dasd_block_set_timer(block, HZ/2); 2449 break; 2450 } 2451 DBF_DEV_EVENT(DBF_ERR, basedev, 2452 "CCW creation failed (rc=%ld) " 2453 "on request %p", 2454 PTR_ERR(cqr), req); 2455 blk_start_request(req); 2456 __blk_end_request_all(req, -EIO); 2457 continue; 2458 } 2459 /* 2460 * Note: callback is set to dasd_return_cqr_cb in 2461 * __dasd_block_start_head to cover erp requests as well 2462 */ 2463 cqr->callback_data = (void *) req; 2464 cqr->status = DASD_CQR_FILLED; 2465 blk_start_request(req); 2466 list_add_tail(&cqr->blocklist, &block->ccw_queue); 2467 dasd_profile_start(block, cqr, req); 2468 } 2469 } 2470 2471 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) 2472 { 2473 struct request *req; 2474 int status; 2475 int error = 0; 2476 2477 req = (struct request *) cqr->callback_data; 2478 dasd_profile_end(cqr->block, cqr, req); 2479 status = cqr->block->base->discipline->free_cp(cqr, req); 2480 if (status <= 0) 2481 error = status ? status : -EIO; 2482 __blk_end_request_all(req, error); 2483 } 2484 2485 /* 2486 * Process ccw request queue. 2487 */ 2488 static void __dasd_process_block_ccw_queue(struct dasd_block *block, 2489 struct list_head *final_queue) 2490 { 2491 struct list_head *l, *n; 2492 struct dasd_ccw_req *cqr; 2493 dasd_erp_fn_t erp_fn; 2494 unsigned long flags; 2495 struct dasd_device *base = block->base; 2496 2497 restart: 2498 /* Process request with final status. */ 2499 list_for_each_safe(l, n, &block->ccw_queue) { 2500 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2501 if (cqr->status != DASD_CQR_DONE && 2502 cqr->status != DASD_CQR_FAILED && 2503 cqr->status != DASD_CQR_NEED_ERP && 2504 cqr->status != DASD_CQR_TERMINATED) 2505 continue; 2506 2507 if (cqr->status == DASD_CQR_TERMINATED) { 2508 base->discipline->handle_terminated_request(cqr); 2509 goto restart; 2510 } 2511 2512 /* Process requests that may be recovered */ 2513 if (cqr->status == DASD_CQR_NEED_ERP) { 2514 erp_fn = base->discipline->erp_action(cqr); 2515 if (IS_ERR(erp_fn(cqr))) 2516 continue; 2517 goto restart; 2518 } 2519 2520 /* log sense for fatal error */ 2521 if (cqr->status == DASD_CQR_FAILED) { 2522 dasd_log_sense(cqr, &cqr->irb); 2523 } 2524 2525 /* First of all call extended error reporting. */ 2526 if (dasd_eer_enabled(base) && 2527 cqr->status == DASD_CQR_FAILED) { 2528 dasd_eer_write(base, cqr, DASD_EER_FATALERROR); 2529 2530 /* restart request */ 2531 cqr->status = DASD_CQR_FILLED; 2532 cqr->retries = 255; 2533 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 2534 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 2535 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 2536 flags); 2537 goto restart; 2538 } 2539 2540 /* Process finished ERP request. */ 2541 if (cqr->refers) { 2542 __dasd_process_erp(base, cqr); 2543 goto restart; 2544 } 2545 2546 /* Rechain finished requests to final queue */ 2547 cqr->endclk = get_clock(); 2548 list_move_tail(&cqr->blocklist, final_queue); 2549 } 2550 } 2551 2552 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) 2553 { 2554 dasd_schedule_block_bh(cqr->block); 2555 } 2556 2557 static void __dasd_block_start_head(struct dasd_block *block) 2558 { 2559 struct dasd_ccw_req *cqr; 2560 2561 if (list_empty(&block->ccw_queue)) 2562 return; 2563 /* We allways begin with the first requests on the queue, as some 2564 * of previously started requests have to be enqueued on a 2565 * dasd_device again for error recovery. 2566 */ 2567 list_for_each_entry(cqr, &block->ccw_queue, blocklist) { 2568 if (cqr->status != DASD_CQR_FILLED) 2569 continue; 2570 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && 2571 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2572 cqr->status = DASD_CQR_FAILED; 2573 cqr->intrc = -EPERM; 2574 dasd_schedule_block_bh(block); 2575 continue; 2576 } 2577 /* Non-temporary stop condition will trigger fail fast */ 2578 if (block->base->stopped & ~DASD_STOPPED_PENDING && 2579 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2580 (!dasd_eer_enabled(block->base))) { 2581 cqr->status = DASD_CQR_FAILED; 2582 dasd_schedule_block_bh(block); 2583 continue; 2584 } 2585 /* Don't try to start requests if device is stopped */ 2586 if (block->base->stopped) 2587 return; 2588 2589 /* just a fail safe check, should not happen */ 2590 if (!cqr->startdev) 2591 cqr->startdev = block->base; 2592 2593 /* make sure that the requests we submit find their way back */ 2594 cqr->callback = dasd_return_cqr_cb; 2595 2596 dasd_add_request_tail(cqr); 2597 } 2598 } 2599 2600 /* 2601 * Central dasd_block layer routine. Takes requests from the generic 2602 * block layer request queue, creates ccw requests, enqueues them on 2603 * a dasd_device and processes ccw requests that have been returned. 2604 */ 2605 static void dasd_block_tasklet(struct dasd_block *block) 2606 { 2607 struct list_head final_queue; 2608 struct list_head *l, *n; 2609 struct dasd_ccw_req *cqr; 2610 2611 atomic_set(&block->tasklet_scheduled, 0); 2612 INIT_LIST_HEAD(&final_queue); 2613 spin_lock(&block->queue_lock); 2614 /* Finish off requests on ccw queue */ 2615 __dasd_process_block_ccw_queue(block, &final_queue); 2616 spin_unlock(&block->queue_lock); 2617 /* Now call the callback function of requests with final status */ 2618 spin_lock_irq(&block->request_queue_lock); 2619 list_for_each_safe(l, n, &final_queue) { 2620 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2621 list_del_init(&cqr->blocklist); 2622 __dasd_cleanup_cqr(cqr); 2623 } 2624 spin_lock(&block->queue_lock); 2625 /* Get new request from the block device request queue */ 2626 __dasd_process_request_queue(block); 2627 /* Now check if the head of the ccw queue needs to be started. */ 2628 __dasd_block_start_head(block); 2629 spin_unlock(&block->queue_lock); 2630 spin_unlock_irq(&block->request_queue_lock); 2631 dasd_put_device(block->base); 2632 } 2633 2634 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) 2635 { 2636 wake_up(&dasd_flush_wq); 2637 } 2638 2639 /* 2640 * Go through all request on the dasd_block request queue, cancel them 2641 * on the respective dasd_device, and return them to the generic 2642 * block layer. 2643 */ 2644 static int dasd_flush_block_queue(struct dasd_block *block) 2645 { 2646 struct dasd_ccw_req *cqr, *n; 2647 int rc, i; 2648 struct list_head flush_queue; 2649 2650 INIT_LIST_HEAD(&flush_queue); 2651 spin_lock_bh(&block->queue_lock); 2652 rc = 0; 2653 restart: 2654 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 2655 /* if this request currently owned by a dasd_device cancel it */ 2656 if (cqr->status >= DASD_CQR_QUEUED) 2657 rc = dasd_cancel_req(cqr); 2658 if (rc < 0) 2659 break; 2660 /* Rechain request (including erp chain) so it won't be 2661 * touched by the dasd_block_tasklet anymore. 2662 * Replace the callback so we notice when the request 2663 * is returned from the dasd_device layer. 2664 */ 2665 cqr->callback = _dasd_wake_block_flush_cb; 2666 for (i = 0; cqr != NULL; cqr = cqr->refers, i++) 2667 list_move_tail(&cqr->blocklist, &flush_queue); 2668 if (i > 1) 2669 /* moved more than one request - need to restart */ 2670 goto restart; 2671 } 2672 spin_unlock_bh(&block->queue_lock); 2673 /* Now call the callback function of flushed requests */ 2674 restart_cb: 2675 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { 2676 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 2677 /* Process finished ERP request. */ 2678 if (cqr->refers) { 2679 spin_lock_bh(&block->queue_lock); 2680 __dasd_process_erp(block->base, cqr); 2681 spin_unlock_bh(&block->queue_lock); 2682 /* restart list_for_xx loop since dasd_process_erp 2683 * might remove multiple elements */ 2684 goto restart_cb; 2685 } 2686 /* call the callback function */ 2687 spin_lock_irq(&block->request_queue_lock); 2688 cqr->endclk = get_clock(); 2689 list_del_init(&cqr->blocklist); 2690 __dasd_cleanup_cqr(cqr); 2691 spin_unlock_irq(&block->request_queue_lock); 2692 } 2693 return rc; 2694 } 2695 2696 /* 2697 * Schedules a call to dasd_tasklet over the device tasklet. 2698 */ 2699 void dasd_schedule_block_bh(struct dasd_block *block) 2700 { 2701 /* Protect against rescheduling. */ 2702 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) 2703 return; 2704 /* life cycle of block is bound to it's base device */ 2705 dasd_get_device(block->base); 2706 tasklet_hi_schedule(&block->tasklet); 2707 } 2708 2709 2710 /* 2711 * SECTION: external block device operations 2712 * (request queue handling, open, release, etc.) 2713 */ 2714 2715 /* 2716 * Dasd request queue function. Called from ll_rw_blk.c 2717 */ 2718 static void do_dasd_request(struct request_queue *queue) 2719 { 2720 struct dasd_block *block; 2721 2722 block = queue->queuedata; 2723 spin_lock(&block->queue_lock); 2724 /* Get new request from the block device request queue */ 2725 __dasd_process_request_queue(block); 2726 /* Now check if the head of the ccw queue needs to be started. */ 2727 __dasd_block_start_head(block); 2728 spin_unlock(&block->queue_lock); 2729 } 2730 2731 /* 2732 * Allocate and initialize request queue and default I/O scheduler. 2733 */ 2734 static int dasd_alloc_queue(struct dasd_block *block) 2735 { 2736 int rc; 2737 2738 block->request_queue = blk_init_queue(do_dasd_request, 2739 &block->request_queue_lock); 2740 if (block->request_queue == NULL) 2741 return -ENOMEM; 2742 2743 block->request_queue->queuedata = block; 2744 2745 elevator_exit(block->request_queue->elevator); 2746 block->request_queue->elevator = NULL; 2747 rc = elevator_init(block->request_queue, "deadline"); 2748 if (rc) { 2749 blk_cleanup_queue(block->request_queue); 2750 return rc; 2751 } 2752 return 0; 2753 } 2754 2755 /* 2756 * Allocate and initialize request queue. 2757 */ 2758 static void dasd_setup_queue(struct dasd_block *block) 2759 { 2760 int max; 2761 2762 if (block->base->features & DASD_FEATURE_USERAW) { 2763 /* 2764 * the max_blocks value for raw_track access is 256 2765 * it is higher than the native ECKD value because we 2766 * only need one ccw per track 2767 * so the max_hw_sectors are 2768 * 2048 x 512B = 1024kB = 16 tracks 2769 */ 2770 max = 2048; 2771 } else { 2772 max = block->base->discipline->max_blocks << block->s2b_shift; 2773 } 2774 blk_queue_logical_block_size(block->request_queue, 2775 block->bp_block); 2776 blk_queue_max_hw_sectors(block->request_queue, max); 2777 blk_queue_max_segments(block->request_queue, -1L); 2778 /* with page sized segments we can translate each segement into 2779 * one idaw/tidaw 2780 */ 2781 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); 2782 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); 2783 } 2784 2785 /* 2786 * Deactivate and free request queue. 2787 */ 2788 static void dasd_free_queue(struct dasd_block *block) 2789 { 2790 if (block->request_queue) { 2791 blk_cleanup_queue(block->request_queue); 2792 block->request_queue = NULL; 2793 } 2794 } 2795 2796 /* 2797 * Flush request on the request queue. 2798 */ 2799 static void dasd_flush_request_queue(struct dasd_block *block) 2800 { 2801 struct request *req; 2802 2803 if (!block->request_queue) 2804 return; 2805 2806 spin_lock_irq(&block->request_queue_lock); 2807 while ((req = blk_fetch_request(block->request_queue))) 2808 __blk_end_request_all(req, -EIO); 2809 spin_unlock_irq(&block->request_queue_lock); 2810 } 2811 2812 static int dasd_open(struct block_device *bdev, fmode_t mode) 2813 { 2814 struct dasd_device *base; 2815 int rc; 2816 2817 base = dasd_device_from_gendisk(bdev->bd_disk); 2818 if (!base) 2819 return -ENODEV; 2820 2821 atomic_inc(&base->block->open_count); 2822 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { 2823 rc = -ENODEV; 2824 goto unlock; 2825 } 2826 2827 if (!try_module_get(base->discipline->owner)) { 2828 rc = -EINVAL; 2829 goto unlock; 2830 } 2831 2832 if (dasd_probeonly) { 2833 dev_info(&base->cdev->dev, 2834 "Accessing the DASD failed because it is in " 2835 "probeonly mode\n"); 2836 rc = -EPERM; 2837 goto out; 2838 } 2839 2840 if (base->state <= DASD_STATE_BASIC) { 2841 DBF_DEV_EVENT(DBF_ERR, base, " %s", 2842 " Cannot open unrecognized device"); 2843 rc = -ENODEV; 2844 goto out; 2845 } 2846 2847 if ((mode & FMODE_WRITE) && 2848 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || 2849 (base->features & DASD_FEATURE_READONLY))) { 2850 rc = -EROFS; 2851 goto out; 2852 } 2853 2854 dasd_put_device(base); 2855 return 0; 2856 2857 out: 2858 module_put(base->discipline->owner); 2859 unlock: 2860 atomic_dec(&base->block->open_count); 2861 dasd_put_device(base); 2862 return rc; 2863 } 2864 2865 static int dasd_release(struct gendisk *disk, fmode_t mode) 2866 { 2867 struct dasd_device *base; 2868 2869 base = dasd_device_from_gendisk(disk); 2870 if (!base) 2871 return -ENODEV; 2872 2873 atomic_dec(&base->block->open_count); 2874 module_put(base->discipline->owner); 2875 dasd_put_device(base); 2876 return 0; 2877 } 2878 2879 /* 2880 * Return disk geometry. 2881 */ 2882 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 2883 { 2884 struct dasd_device *base; 2885 2886 base = dasd_device_from_gendisk(bdev->bd_disk); 2887 if (!base) 2888 return -ENODEV; 2889 2890 if (!base->discipline || 2891 !base->discipline->fill_geometry) { 2892 dasd_put_device(base); 2893 return -EINVAL; 2894 } 2895 base->discipline->fill_geometry(base->block, geo); 2896 geo->start = get_start_sect(bdev) >> base->block->s2b_shift; 2897 dasd_put_device(base); 2898 return 0; 2899 } 2900 2901 const struct block_device_operations 2902 dasd_device_operations = { 2903 .owner = THIS_MODULE, 2904 .open = dasd_open, 2905 .release = dasd_release, 2906 .ioctl = dasd_ioctl, 2907 .compat_ioctl = dasd_ioctl, 2908 .getgeo = dasd_getgeo, 2909 }; 2910 2911 /******************************************************************************* 2912 * end of block device operations 2913 */ 2914 2915 static void 2916 dasd_exit(void) 2917 { 2918 #ifdef CONFIG_PROC_FS 2919 dasd_proc_exit(); 2920 #endif 2921 dasd_eer_exit(); 2922 if (dasd_page_cache != NULL) { 2923 kmem_cache_destroy(dasd_page_cache); 2924 dasd_page_cache = NULL; 2925 } 2926 dasd_gendisk_exit(); 2927 dasd_devmap_exit(); 2928 if (dasd_debug_area != NULL) { 2929 debug_unregister(dasd_debug_area); 2930 dasd_debug_area = NULL; 2931 } 2932 dasd_statistics_removeroot(); 2933 } 2934 2935 /* 2936 * SECTION: common functions for ccw_driver use 2937 */ 2938 2939 /* 2940 * Is the device read-only? 2941 * Note that this function does not report the setting of the 2942 * readonly device attribute, but how it is configured in z/VM. 2943 */ 2944 int dasd_device_is_ro(struct dasd_device *device) 2945 { 2946 struct ccw_dev_id dev_id; 2947 struct diag210 diag_data; 2948 int rc; 2949 2950 if (!MACHINE_IS_VM) 2951 return 0; 2952 ccw_device_get_id(device->cdev, &dev_id); 2953 memset(&diag_data, 0, sizeof(diag_data)); 2954 diag_data.vrdcdvno = dev_id.devno; 2955 diag_data.vrdclen = sizeof(diag_data); 2956 rc = diag210(&diag_data); 2957 if (rc == 0 || rc == 2) { 2958 return diag_data.vrdcvfla & 0x80; 2959 } else { 2960 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", 2961 dev_id.devno, rc); 2962 return 0; 2963 } 2964 } 2965 EXPORT_SYMBOL_GPL(dasd_device_is_ro); 2966 2967 static void dasd_generic_auto_online(void *data, async_cookie_t cookie) 2968 { 2969 struct ccw_device *cdev = data; 2970 int ret; 2971 2972 ret = ccw_device_set_online(cdev); 2973 if (ret) 2974 pr_warning("%s: Setting the DASD online failed with rc=%d\n", 2975 dev_name(&cdev->dev), ret); 2976 } 2977 2978 /* 2979 * Initial attempt at a probe function. this can be simplified once 2980 * the other detection code is gone. 2981 */ 2982 int dasd_generic_probe(struct ccw_device *cdev, 2983 struct dasd_discipline *discipline) 2984 { 2985 int ret; 2986 2987 ret = dasd_add_sysfs_files(cdev); 2988 if (ret) { 2989 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", 2990 "dasd_generic_probe: could not add " 2991 "sysfs entries"); 2992 return ret; 2993 } 2994 cdev->handler = &dasd_int_handler; 2995 2996 /* 2997 * Automatically online either all dasd devices (dasd_autodetect) 2998 * or all devices specified with dasd= parameters during 2999 * initial probe. 3000 */ 3001 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || 3002 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) 3003 async_schedule(dasd_generic_auto_online, cdev); 3004 return 0; 3005 } 3006 3007 /* 3008 * This will one day be called from a global not_oper handler. 3009 * It is also used by driver_unregister during module unload. 3010 */ 3011 void dasd_generic_remove(struct ccw_device *cdev) 3012 { 3013 struct dasd_device *device; 3014 struct dasd_block *block; 3015 3016 cdev->handler = NULL; 3017 3018 dasd_remove_sysfs_files(cdev); 3019 device = dasd_device_from_cdev(cdev); 3020 if (IS_ERR(device)) 3021 return; 3022 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3023 /* Already doing offline processing */ 3024 dasd_put_device(device); 3025 return; 3026 } 3027 /* 3028 * This device is removed unconditionally. Set offline 3029 * flag to prevent dasd_open from opening it while it is 3030 * no quite down yet. 3031 */ 3032 dasd_set_target_state(device, DASD_STATE_NEW); 3033 /* dasd_delete_device destroys the device reference. */ 3034 block = device->block; 3035 dasd_delete_device(device); 3036 /* 3037 * life cycle of block is bound to device, so delete it after 3038 * device was safely removed 3039 */ 3040 if (block) 3041 dasd_free_block(block); 3042 } 3043 3044 /* 3045 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either 3046 * the device is detected for the first time and is supposed to be used 3047 * or the user has started activation through sysfs. 3048 */ 3049 int dasd_generic_set_online(struct ccw_device *cdev, 3050 struct dasd_discipline *base_discipline) 3051 { 3052 struct dasd_discipline *discipline; 3053 struct dasd_device *device; 3054 int rc; 3055 3056 /* first online clears initial online feature flag */ 3057 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); 3058 device = dasd_create_device(cdev); 3059 if (IS_ERR(device)) 3060 return PTR_ERR(device); 3061 3062 discipline = base_discipline; 3063 if (device->features & DASD_FEATURE_USEDIAG) { 3064 if (!dasd_diag_discipline_pointer) { 3065 pr_warning("%s Setting the DASD online failed because " 3066 "of missing DIAG discipline\n", 3067 dev_name(&cdev->dev)); 3068 dasd_delete_device(device); 3069 return -ENODEV; 3070 } 3071 discipline = dasd_diag_discipline_pointer; 3072 } 3073 if (!try_module_get(base_discipline->owner)) { 3074 dasd_delete_device(device); 3075 return -EINVAL; 3076 } 3077 if (!try_module_get(discipline->owner)) { 3078 module_put(base_discipline->owner); 3079 dasd_delete_device(device); 3080 return -EINVAL; 3081 } 3082 device->base_discipline = base_discipline; 3083 device->discipline = discipline; 3084 3085 /* check_device will allocate block device if necessary */ 3086 rc = discipline->check_device(device); 3087 if (rc) { 3088 pr_warning("%s Setting the DASD online with discipline %s " 3089 "failed with rc=%i\n", 3090 dev_name(&cdev->dev), discipline->name, rc); 3091 module_put(discipline->owner); 3092 module_put(base_discipline->owner); 3093 dasd_delete_device(device); 3094 return rc; 3095 } 3096 3097 dasd_set_target_state(device, DASD_STATE_ONLINE); 3098 if (device->state <= DASD_STATE_KNOWN) { 3099 pr_warning("%s Setting the DASD online failed because of a " 3100 "missing discipline\n", dev_name(&cdev->dev)); 3101 rc = -ENODEV; 3102 dasd_set_target_state(device, DASD_STATE_NEW); 3103 if (device->block) 3104 dasd_free_block(device->block); 3105 dasd_delete_device(device); 3106 } else 3107 pr_debug("dasd_generic device %s found\n", 3108 dev_name(&cdev->dev)); 3109 3110 wait_event(dasd_init_waitq, _wait_for_device(device)); 3111 3112 dasd_put_device(device); 3113 return rc; 3114 } 3115 3116 int dasd_generic_set_offline(struct ccw_device *cdev) 3117 { 3118 struct dasd_device *device; 3119 struct dasd_block *block; 3120 int max_count, open_count; 3121 3122 device = dasd_device_from_cdev(cdev); 3123 if (IS_ERR(device)) 3124 return PTR_ERR(device); 3125 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3126 /* Already doing offline processing */ 3127 dasd_put_device(device); 3128 return 0; 3129 } 3130 /* 3131 * We must make sure that this device is currently not in use. 3132 * The open_count is increased for every opener, that includes 3133 * the blkdev_get in dasd_scan_partitions. We are only interested 3134 * in the other openers. 3135 */ 3136 if (device->block) { 3137 max_count = device->block->bdev ? 0 : -1; 3138 open_count = atomic_read(&device->block->open_count); 3139 if (open_count > max_count) { 3140 if (open_count > 0) 3141 pr_warning("%s: The DASD cannot be set offline " 3142 "with open count %i\n", 3143 dev_name(&cdev->dev), open_count); 3144 else 3145 pr_warning("%s: The DASD cannot be set offline " 3146 "while it is in use\n", 3147 dev_name(&cdev->dev)); 3148 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3149 dasd_put_device(device); 3150 return -EBUSY; 3151 } 3152 } 3153 dasd_set_target_state(device, DASD_STATE_NEW); 3154 /* dasd_delete_device destroys the device reference. */ 3155 block = device->block; 3156 dasd_delete_device(device); 3157 /* 3158 * life cycle of block is bound to device, so delete it after 3159 * device was safely removed 3160 */ 3161 if (block) 3162 dasd_free_block(block); 3163 return 0; 3164 } 3165 3166 int dasd_generic_last_path_gone(struct dasd_device *device) 3167 { 3168 struct dasd_ccw_req *cqr; 3169 3170 dev_warn(&device->cdev->dev, "No operational channel path is left " 3171 "for the device\n"); 3172 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); 3173 /* First of all call extended error reporting. */ 3174 dasd_eer_write(device, NULL, DASD_EER_NOPATH); 3175 3176 if (device->state < DASD_STATE_BASIC) 3177 return 0; 3178 /* Device is active. We want to keep it. */ 3179 list_for_each_entry(cqr, &device->ccw_queue, devlist) 3180 if ((cqr->status == DASD_CQR_IN_IO) || 3181 (cqr->status == DASD_CQR_CLEAR_PENDING)) { 3182 cqr->status = DASD_CQR_QUEUED; 3183 cqr->retries++; 3184 } 3185 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); 3186 dasd_device_clear_timer(device); 3187 dasd_schedule_device_bh(device); 3188 return 1; 3189 } 3190 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); 3191 3192 int dasd_generic_path_operational(struct dasd_device *device) 3193 { 3194 dev_info(&device->cdev->dev, "A channel path to the device has become " 3195 "operational\n"); 3196 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); 3197 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); 3198 if (device->stopped & DASD_UNRESUMED_PM) { 3199 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); 3200 dasd_restore_device(device); 3201 return 1; 3202 } 3203 dasd_schedule_device_bh(device); 3204 if (device->block) 3205 dasd_schedule_block_bh(device->block); 3206 return 1; 3207 } 3208 EXPORT_SYMBOL_GPL(dasd_generic_path_operational); 3209 3210 int dasd_generic_notify(struct ccw_device *cdev, int event) 3211 { 3212 struct dasd_device *device; 3213 int ret; 3214 3215 device = dasd_device_from_cdev_locked(cdev); 3216 if (IS_ERR(device)) 3217 return 0; 3218 ret = 0; 3219 switch (event) { 3220 case CIO_GONE: 3221 case CIO_BOXED: 3222 case CIO_NO_PATH: 3223 device->path_data.opm = 0; 3224 device->path_data.ppm = 0; 3225 device->path_data.npm = 0; 3226 ret = dasd_generic_last_path_gone(device); 3227 break; 3228 case CIO_OPER: 3229 ret = 1; 3230 if (device->path_data.opm) 3231 ret = dasd_generic_path_operational(device); 3232 break; 3233 } 3234 dasd_put_device(device); 3235 return ret; 3236 } 3237 3238 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) 3239 { 3240 int chp; 3241 __u8 oldopm, eventlpm; 3242 struct dasd_device *device; 3243 3244 device = dasd_device_from_cdev_locked(cdev); 3245 if (IS_ERR(device)) 3246 return; 3247 for (chp = 0; chp < 8; chp++) { 3248 eventlpm = 0x80 >> chp; 3249 if (path_event[chp] & PE_PATH_GONE) { 3250 oldopm = device->path_data.opm; 3251 device->path_data.opm &= ~eventlpm; 3252 device->path_data.ppm &= ~eventlpm; 3253 device->path_data.npm &= ~eventlpm; 3254 if (oldopm && !device->path_data.opm) 3255 dasd_generic_last_path_gone(device); 3256 } 3257 if (path_event[chp] & PE_PATH_AVAILABLE) { 3258 device->path_data.opm &= ~eventlpm; 3259 device->path_data.ppm &= ~eventlpm; 3260 device->path_data.npm &= ~eventlpm; 3261 device->path_data.tbvpm |= eventlpm; 3262 dasd_schedule_device_bh(device); 3263 } 3264 } 3265 dasd_put_device(device); 3266 } 3267 EXPORT_SYMBOL_GPL(dasd_generic_path_event); 3268 3269 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) 3270 { 3271 if (!device->path_data.opm && lpm) { 3272 device->path_data.opm = lpm; 3273 dasd_generic_path_operational(device); 3274 } else 3275 device->path_data.opm |= lpm; 3276 return 0; 3277 } 3278 EXPORT_SYMBOL_GPL(dasd_generic_verify_path); 3279 3280 3281 int dasd_generic_pm_freeze(struct ccw_device *cdev) 3282 { 3283 struct dasd_ccw_req *cqr, *n; 3284 int rc; 3285 struct list_head freeze_queue; 3286 struct dasd_device *device = dasd_device_from_cdev(cdev); 3287 3288 if (IS_ERR(device)) 3289 return PTR_ERR(device); 3290 3291 /* mark device as suspended */ 3292 set_bit(DASD_FLAG_SUSPENDED, &device->flags); 3293 3294 if (device->discipline->freeze) 3295 rc = device->discipline->freeze(device); 3296 3297 /* disallow new I/O */ 3298 dasd_device_set_stop_bits(device, DASD_STOPPED_PM); 3299 /* clear active requests */ 3300 INIT_LIST_HEAD(&freeze_queue); 3301 spin_lock_irq(get_ccwdev_lock(cdev)); 3302 rc = 0; 3303 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 3304 /* Check status and move request to flush_queue */ 3305 if (cqr->status == DASD_CQR_IN_IO) { 3306 rc = device->discipline->term_IO(cqr); 3307 if (rc) { 3308 /* unable to terminate requeust */ 3309 dev_err(&device->cdev->dev, 3310 "Unable to terminate request %p " 3311 "on suspend\n", cqr); 3312 spin_unlock_irq(get_ccwdev_lock(cdev)); 3313 dasd_put_device(device); 3314 return rc; 3315 } 3316 } 3317 list_move_tail(&cqr->devlist, &freeze_queue); 3318 } 3319 3320 spin_unlock_irq(get_ccwdev_lock(cdev)); 3321 3322 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { 3323 wait_event(dasd_flush_wq, 3324 (cqr->status != DASD_CQR_CLEAR_PENDING)); 3325 if (cqr->status == DASD_CQR_CLEARED) 3326 cqr->status = DASD_CQR_QUEUED; 3327 } 3328 /* move freeze_queue to start of the ccw_queue */ 3329 spin_lock_irq(get_ccwdev_lock(cdev)); 3330 list_splice_tail(&freeze_queue, &device->ccw_queue); 3331 spin_unlock_irq(get_ccwdev_lock(cdev)); 3332 3333 dasd_put_device(device); 3334 return rc; 3335 } 3336 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); 3337 3338 int dasd_generic_restore_device(struct ccw_device *cdev) 3339 { 3340 struct dasd_device *device = dasd_device_from_cdev(cdev); 3341 int rc = 0; 3342 3343 if (IS_ERR(device)) 3344 return PTR_ERR(device); 3345 3346 /* allow new IO again */ 3347 dasd_device_remove_stop_bits(device, 3348 (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); 3349 3350 dasd_schedule_device_bh(device); 3351 3352 /* 3353 * call discipline restore function 3354 * if device is stopped do nothing e.g. for disconnected devices 3355 */ 3356 if (device->discipline->restore && !(device->stopped)) 3357 rc = device->discipline->restore(device); 3358 if (rc || device->stopped) 3359 /* 3360 * if the resume failed for the DASD we put it in 3361 * an UNRESUMED stop state 3362 */ 3363 device->stopped |= DASD_UNRESUMED_PM; 3364 3365 if (device->block) 3366 dasd_schedule_block_bh(device->block); 3367 3368 clear_bit(DASD_FLAG_SUSPENDED, &device->flags); 3369 dasd_put_device(device); 3370 return 0; 3371 } 3372 EXPORT_SYMBOL_GPL(dasd_generic_restore_device); 3373 3374 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, 3375 void *rdc_buffer, 3376 int rdc_buffer_size, 3377 int magic) 3378 { 3379 struct dasd_ccw_req *cqr; 3380 struct ccw1 *ccw; 3381 unsigned long *idaw; 3382 3383 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); 3384 3385 if (IS_ERR(cqr)) { 3386 /* internal error 13 - Allocating the RDC request failed*/ 3387 dev_err(&device->cdev->dev, 3388 "An error occurred in the DASD device driver, " 3389 "reason=%s\n", "13"); 3390 return cqr; 3391 } 3392 3393 ccw = cqr->cpaddr; 3394 ccw->cmd_code = CCW_CMD_RDC; 3395 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { 3396 idaw = (unsigned long *) (cqr->data); 3397 ccw->cda = (__u32)(addr_t) idaw; 3398 ccw->flags = CCW_FLAG_IDA; 3399 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); 3400 } else { 3401 ccw->cda = (__u32)(addr_t) rdc_buffer; 3402 ccw->flags = 0; 3403 } 3404 3405 ccw->count = rdc_buffer_size; 3406 cqr->startdev = device; 3407 cqr->memdev = device; 3408 cqr->expires = 10*HZ; 3409 cqr->retries = 256; 3410 cqr->buildclk = get_clock(); 3411 cqr->status = DASD_CQR_FILLED; 3412 return cqr; 3413 } 3414 3415 3416 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, 3417 void *rdc_buffer, int rdc_buffer_size) 3418 { 3419 int ret; 3420 struct dasd_ccw_req *cqr; 3421 3422 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, 3423 magic); 3424 if (IS_ERR(cqr)) 3425 return PTR_ERR(cqr); 3426 3427 ret = dasd_sleep_on(cqr); 3428 dasd_sfree_request(cqr, cqr->memdev); 3429 return ret; 3430 } 3431 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); 3432 3433 /* 3434 * In command mode and transport mode we need to look for sense 3435 * data in different places. The sense data itself is allways 3436 * an array of 32 bytes, so we can unify the sense data access 3437 * for both modes. 3438 */ 3439 char *dasd_get_sense(struct irb *irb) 3440 { 3441 struct tsb *tsb = NULL; 3442 char *sense = NULL; 3443 3444 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { 3445 if (irb->scsw.tm.tcw) 3446 tsb = tcw_get_tsb((struct tcw *)(unsigned long) 3447 irb->scsw.tm.tcw); 3448 if (tsb && tsb->length == 64 && tsb->flags) 3449 switch (tsb->flags & 0x07) { 3450 case 1: /* tsa_iostat */ 3451 sense = tsb->tsa.iostat.sense; 3452 break; 3453 case 2: /* tsa_ddpc */ 3454 sense = tsb->tsa.ddpc.sense; 3455 break; 3456 default: 3457 /* currently we don't use interrogate data */ 3458 break; 3459 } 3460 } else if (irb->esw.esw0.erw.cons) { 3461 sense = irb->ecw; 3462 } 3463 return sense; 3464 } 3465 EXPORT_SYMBOL_GPL(dasd_get_sense); 3466 3467 static int __init dasd_init(void) 3468 { 3469 int rc; 3470 3471 init_waitqueue_head(&dasd_init_waitq); 3472 init_waitqueue_head(&dasd_flush_wq); 3473 init_waitqueue_head(&generic_waitq); 3474 3475 /* register 'common' DASD debug area, used for all DBF_XXX calls */ 3476 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); 3477 if (dasd_debug_area == NULL) { 3478 rc = -ENOMEM; 3479 goto failed; 3480 } 3481 debug_register_view(dasd_debug_area, &debug_sprintf_view); 3482 debug_set_level(dasd_debug_area, DBF_WARNING); 3483 3484 DBF_EVENT(DBF_EMERG, "%s", "debug area created"); 3485 3486 dasd_diag_discipline_pointer = NULL; 3487 3488 dasd_statistics_createroot(); 3489 3490 rc = dasd_devmap_init(); 3491 if (rc) 3492 goto failed; 3493 rc = dasd_gendisk_init(); 3494 if (rc) 3495 goto failed; 3496 rc = dasd_parse(); 3497 if (rc) 3498 goto failed; 3499 rc = dasd_eer_init(); 3500 if (rc) 3501 goto failed; 3502 #ifdef CONFIG_PROC_FS 3503 rc = dasd_proc_init(); 3504 if (rc) 3505 goto failed; 3506 #endif 3507 3508 return 0; 3509 failed: 3510 pr_info("The DASD device driver could not be initialized\n"); 3511 dasd_exit(); 3512 return rc; 3513 } 3514 3515 module_init(dasd_init); 3516 module_exit(dasd_exit); 3517 3518 EXPORT_SYMBOL(dasd_debug_area); 3519 EXPORT_SYMBOL(dasd_diag_discipline_pointer); 3520 3521 EXPORT_SYMBOL(dasd_add_request_head); 3522 EXPORT_SYMBOL(dasd_add_request_tail); 3523 EXPORT_SYMBOL(dasd_cancel_req); 3524 EXPORT_SYMBOL(dasd_device_clear_timer); 3525 EXPORT_SYMBOL(dasd_block_clear_timer); 3526 EXPORT_SYMBOL(dasd_enable_device); 3527 EXPORT_SYMBOL(dasd_int_handler); 3528 EXPORT_SYMBOL(dasd_kfree_request); 3529 EXPORT_SYMBOL(dasd_kick_device); 3530 EXPORT_SYMBOL(dasd_kmalloc_request); 3531 EXPORT_SYMBOL(dasd_schedule_device_bh); 3532 EXPORT_SYMBOL(dasd_schedule_block_bh); 3533 EXPORT_SYMBOL(dasd_set_target_state); 3534 EXPORT_SYMBOL(dasd_device_set_timer); 3535 EXPORT_SYMBOL(dasd_block_set_timer); 3536 EXPORT_SYMBOL(dasd_sfree_request); 3537 EXPORT_SYMBOL(dasd_sleep_on); 3538 EXPORT_SYMBOL(dasd_sleep_on_immediatly); 3539 EXPORT_SYMBOL(dasd_sleep_on_interruptible); 3540 EXPORT_SYMBOL(dasd_smalloc_request); 3541 EXPORT_SYMBOL(dasd_start_IO); 3542 EXPORT_SYMBOL(dasd_term_IO); 3543 3544 EXPORT_SYMBOL_GPL(dasd_generic_probe); 3545 EXPORT_SYMBOL_GPL(dasd_generic_remove); 3546 EXPORT_SYMBOL_GPL(dasd_generic_notify); 3547 EXPORT_SYMBOL_GPL(dasd_generic_set_online); 3548 EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 3549 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); 3550 EXPORT_SYMBOL_GPL(dasd_flush_device_queue); 3551 EXPORT_SYMBOL_GPL(dasd_alloc_block); 3552 EXPORT_SYMBOL_GPL(dasd_free_block); 3553