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Merge remote-tracking branch 'selinux/next'
[deliverable/linux.git] / drivers / s390 / block / dasd.c
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
8 */
9
10 #define KMSG_COMPONENT "dasd"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/kmod.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/ctype.h>
17 #include <linux/major.h>
18 #include <linux/slab.h>
19 #include <linux/hdreg.h>
20 #include <linux/async.h>
21 #include <linux/mutex.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <linux/vmalloc.h>
25
26 #include <asm/ccwdev.h>
27 #include <asm/ebcdic.h>
28 #include <asm/idals.h>
29 #include <asm/itcw.h>
30 #include <asm/diag.h>
31
32 /* This is ugly... */
33 #define PRINTK_HEADER "dasd:"
34
35 #include "dasd_int.h"
36 /*
37 * SECTION: Constant definitions to be used within this file
38 */
39 #define DASD_CHANQ_MAX_SIZE 4
40
41 #define DASD_DIAG_MOD "dasd_diag_mod"
42
43 /*
44 * SECTION: exported variables of dasd.c
45 */
46 debug_info_t *dasd_debug_area;
47 EXPORT_SYMBOL(dasd_debug_area);
48 static struct dentry *dasd_debugfs_root_entry;
49 struct dasd_discipline *dasd_diag_discipline_pointer;
50 EXPORT_SYMBOL(dasd_diag_discipline_pointer);
51 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
52
53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright IBM Corp. 2000");
56 MODULE_SUPPORTED_DEVICE("dasd");
57 MODULE_LICENSE("GPL");
58
59 /*
60 * SECTION: prototypes for static functions of dasd.c
61 */
62 static int dasd_alloc_queue(struct dasd_block *);
63 static void dasd_setup_queue(struct dasd_block *);
64 static void dasd_free_queue(struct dasd_block *);
65 static void dasd_flush_request_queue(struct dasd_block *);
66 static int dasd_flush_block_queue(struct dasd_block *);
67 static void dasd_device_tasklet(struct dasd_device *);
68 static void dasd_block_tasklet(struct dasd_block *);
69 static void do_kick_device(struct work_struct *);
70 static void do_restore_device(struct work_struct *);
71 static void do_reload_device(struct work_struct *);
72 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
73 static void dasd_device_timeout(unsigned long);
74 static void dasd_block_timeout(unsigned long);
75 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
76 static void dasd_profile_init(struct dasd_profile *, struct dentry *);
77 static void dasd_profile_exit(struct dasd_profile *);
78 static void dasd_hosts_init(struct dentry *, struct dasd_device *);
79 static void dasd_hosts_exit(struct dasd_device *);
80
81 /*
82 * SECTION: Operations on the device structure.
83 */
84 static wait_queue_head_t dasd_init_waitq;
85 static wait_queue_head_t dasd_flush_wq;
86 static wait_queue_head_t generic_waitq;
87 static wait_queue_head_t shutdown_waitq;
88
89 /*
90 * Allocate memory for a new device structure.
91 */
92 struct dasd_device *dasd_alloc_device(void)
93 {
94 struct dasd_device *device;
95
96 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
97 if (!device)
98 return ERR_PTR(-ENOMEM);
99
100 /* Get two pages for normal block device operations. */
101 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
102 if (!device->ccw_mem) {
103 kfree(device);
104 return ERR_PTR(-ENOMEM);
105 }
106 /* Get one page for error recovery. */
107 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
108 if (!device->erp_mem) {
109 free_pages((unsigned long) device->ccw_mem, 1);
110 kfree(device);
111 return ERR_PTR(-ENOMEM);
112 }
113
114 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
115 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
116 spin_lock_init(&device->mem_lock);
117 atomic_set(&device->tasklet_scheduled, 0);
118 tasklet_init(&device->tasklet,
119 (void (*)(unsigned long)) dasd_device_tasklet,
120 (unsigned long) device);
121 INIT_LIST_HEAD(&device->ccw_queue);
122 init_timer(&device->timer);
123 device->timer.function = dasd_device_timeout;
124 device->timer.data = (unsigned long) device;
125 INIT_WORK(&device->kick_work, do_kick_device);
126 INIT_WORK(&device->restore_device, do_restore_device);
127 INIT_WORK(&device->reload_device, do_reload_device);
128 device->state = DASD_STATE_NEW;
129 device->target = DASD_STATE_NEW;
130 mutex_init(&device->state_mutex);
131 spin_lock_init(&device->profile.lock);
132 return device;
133 }
134
135 /*
136 * Free memory of a device structure.
137 */
138 void dasd_free_device(struct dasd_device *device)
139 {
140 kfree(device->private);
141 free_page((unsigned long) device->erp_mem);
142 free_pages((unsigned long) device->ccw_mem, 1);
143 kfree(device);
144 }
145
146 /*
147 * Allocate memory for a new device structure.
148 */
149 struct dasd_block *dasd_alloc_block(void)
150 {
151 struct dasd_block *block;
152
153 block = kzalloc(sizeof(*block), GFP_ATOMIC);
154 if (!block)
155 return ERR_PTR(-ENOMEM);
156 /* open_count = 0 means device online but not in use */
157 atomic_set(&block->open_count, -1);
158
159 spin_lock_init(&block->request_queue_lock);
160 atomic_set(&block->tasklet_scheduled, 0);
161 tasklet_init(&block->tasklet,
162 (void (*)(unsigned long)) dasd_block_tasklet,
163 (unsigned long) block);
164 INIT_LIST_HEAD(&block->ccw_queue);
165 spin_lock_init(&block->queue_lock);
166 init_timer(&block->timer);
167 block->timer.function = dasd_block_timeout;
168 block->timer.data = (unsigned long) block;
169 spin_lock_init(&block->profile.lock);
170
171 return block;
172 }
173 EXPORT_SYMBOL_GPL(dasd_alloc_block);
174
175 /*
176 * Free memory of a device structure.
177 */
178 void dasd_free_block(struct dasd_block *block)
179 {
180 kfree(block);
181 }
182 EXPORT_SYMBOL_GPL(dasd_free_block);
183
184 /*
185 * Make a new device known to the system.
186 */
187 static int dasd_state_new_to_known(struct dasd_device *device)
188 {
189 int rc;
190
191 /*
192 * As long as the device is not in state DASD_STATE_NEW we want to
193 * keep the reference count > 0.
194 */
195 dasd_get_device(device);
196
197 if (device->block) {
198 rc = dasd_alloc_queue(device->block);
199 if (rc) {
200 dasd_put_device(device);
201 return rc;
202 }
203 }
204 device->state = DASD_STATE_KNOWN;
205 return 0;
206 }
207
208 /*
209 * Let the system forget about a device.
210 */
211 static int dasd_state_known_to_new(struct dasd_device *device)
212 {
213 /* Disable extended error reporting for this device. */
214 dasd_eer_disable(device);
215 /* Forget the discipline information. */
216 if (device->discipline) {
217 if (device->discipline->uncheck_device)
218 device->discipline->uncheck_device(device);
219 module_put(device->discipline->owner);
220 }
221 device->discipline = NULL;
222 if (device->base_discipline)
223 module_put(device->base_discipline->owner);
224 device->base_discipline = NULL;
225 device->state = DASD_STATE_NEW;
226
227 if (device->block)
228 dasd_free_queue(device->block);
229
230 /* Give up reference we took in dasd_state_new_to_known. */
231 dasd_put_device(device);
232 return 0;
233 }
234
235 static struct dentry *dasd_debugfs_setup(const char *name,
236 struct dentry *base_dentry)
237 {
238 struct dentry *pde;
239
240 if (!base_dentry)
241 return NULL;
242 pde = debugfs_create_dir(name, base_dentry);
243 if (!pde || IS_ERR(pde))
244 return NULL;
245 return pde;
246 }
247
248 /*
249 * Request the irq line for the device.
250 */
251 static int dasd_state_known_to_basic(struct dasd_device *device)
252 {
253 struct dasd_block *block = device->block;
254 int rc = 0;
255
256 /* Allocate and register gendisk structure. */
257 if (block) {
258 rc = dasd_gendisk_alloc(block);
259 if (rc)
260 return rc;
261 block->debugfs_dentry =
262 dasd_debugfs_setup(block->gdp->disk_name,
263 dasd_debugfs_root_entry);
264 dasd_profile_init(&block->profile, block->debugfs_dentry);
265 if (dasd_global_profile_level == DASD_PROFILE_ON)
266 dasd_profile_on(&device->block->profile);
267 }
268 device->debugfs_dentry =
269 dasd_debugfs_setup(dev_name(&device->cdev->dev),
270 dasd_debugfs_root_entry);
271 dasd_profile_init(&device->profile, device->debugfs_dentry);
272 dasd_hosts_init(device->debugfs_dentry, device);
273
274 /* register 'device' debug area, used for all DBF_DEV_XXX calls */
275 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
276 8 * sizeof(long));
277 debug_register_view(device->debug_area, &debug_sprintf_view);
278 debug_set_level(device->debug_area, DBF_WARNING);
279 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
280
281 device->state = DASD_STATE_BASIC;
282
283 return rc;
284 }
285
286 /*
287 * Release the irq line for the device. Terminate any running i/o.
288 */
289 static int dasd_state_basic_to_known(struct dasd_device *device)
290 {
291 int rc;
292
293 if (device->discipline->basic_to_known) {
294 rc = device->discipline->basic_to_known(device);
295 if (rc)
296 return rc;
297 }
298
299 if (device->block) {
300 dasd_profile_exit(&device->block->profile);
301 debugfs_remove(device->block->debugfs_dentry);
302 dasd_gendisk_free(device->block);
303 dasd_block_clear_timer(device->block);
304 }
305 rc = dasd_flush_device_queue(device);
306 if (rc)
307 return rc;
308 dasd_device_clear_timer(device);
309 dasd_profile_exit(&device->profile);
310 dasd_hosts_exit(device);
311 debugfs_remove(device->debugfs_dentry);
312 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
313 if (device->debug_area != NULL) {
314 debug_unregister(device->debug_area);
315 device->debug_area = NULL;
316 }
317 device->state = DASD_STATE_KNOWN;
318 return 0;
319 }
320
321 /*
322 * Do the initial analysis. The do_analysis function may return
323 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC
324 * until the discipline decides to continue the startup sequence
325 * by calling the function dasd_change_state. The eckd disciplines
326 * uses this to start a ccw that detects the format. The completion
327 * interrupt for this detection ccw uses the kernel event daemon to
328 * trigger the call to dasd_change_state. All this is done in the
329 * discipline code, see dasd_eckd.c.
330 * After the analysis ccw is done (do_analysis returned 0) the block
331 * device is setup.
332 * In case the analysis returns an error, the device setup is stopped
333 * (a fake disk was already added to allow formatting).
334 */
335 static int dasd_state_basic_to_ready(struct dasd_device *device)
336 {
337 int rc;
338 struct dasd_block *block;
339
340 rc = 0;
341 block = device->block;
342 /* make disk known with correct capacity */
343 if (block) {
344 if (block->base->discipline->do_analysis != NULL)
345 rc = block->base->discipline->do_analysis(block);
346 if (rc) {
347 if (rc != -EAGAIN) {
348 device->state = DASD_STATE_UNFMT;
349 goto out;
350 }
351 return rc;
352 }
353 dasd_setup_queue(block);
354 set_capacity(block->gdp,
355 block->blocks << block->s2b_shift);
356 device->state = DASD_STATE_READY;
357 rc = dasd_scan_partitions(block);
358 if (rc) {
359 device->state = DASD_STATE_BASIC;
360 return rc;
361 }
362 } else {
363 device->state = DASD_STATE_READY;
364 }
365 out:
366 if (device->discipline->basic_to_ready)
367 rc = device->discipline->basic_to_ready(device);
368 return rc;
369 }
370
371 static inline
372 int _wait_for_empty_queues(struct dasd_device *device)
373 {
374 if (device->block)
375 return list_empty(&device->ccw_queue) &&
376 list_empty(&device->block->ccw_queue);
377 else
378 return list_empty(&device->ccw_queue);
379 }
380
381 /*
382 * Remove device from block device layer. Destroy dirty buffers.
383 * Forget format information. Check if the target level is basic
384 * and if it is create fake disk for formatting.
385 */
386 static int dasd_state_ready_to_basic(struct dasd_device *device)
387 {
388 int rc;
389
390 device->state = DASD_STATE_BASIC;
391 if (device->block) {
392 struct dasd_block *block = device->block;
393 rc = dasd_flush_block_queue(block);
394 if (rc) {
395 device->state = DASD_STATE_READY;
396 return rc;
397 }
398 dasd_flush_request_queue(block);
399 dasd_destroy_partitions(block);
400 block->blocks = 0;
401 block->bp_block = 0;
402 block->s2b_shift = 0;
403 }
404 return 0;
405 }
406
407 /*
408 * Back to basic.
409 */
410 static int dasd_state_unfmt_to_basic(struct dasd_device *device)
411 {
412 device->state = DASD_STATE_BASIC;
413 return 0;
414 }
415
416 /*
417 * Make the device online and schedule the bottom half to start
418 * the requeueing of requests from the linux request queue to the
419 * ccw queue.
420 */
421 static int
422 dasd_state_ready_to_online(struct dasd_device * device)
423 {
424 struct gendisk *disk;
425 struct disk_part_iter piter;
426 struct hd_struct *part;
427
428 device->state = DASD_STATE_ONLINE;
429 if (device->block) {
430 dasd_schedule_block_bh(device->block);
431 if ((device->features & DASD_FEATURE_USERAW)) {
432 disk = device->block->gdp;
433 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
434 return 0;
435 }
436 disk = device->block->bdev->bd_disk;
437 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
438 while ((part = disk_part_iter_next(&piter)))
439 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
440 disk_part_iter_exit(&piter);
441 }
442 return 0;
443 }
444
445 /*
446 * Stop the requeueing of requests again.
447 */
448 static int dasd_state_online_to_ready(struct dasd_device *device)
449 {
450 int rc;
451 struct gendisk *disk;
452 struct disk_part_iter piter;
453 struct hd_struct *part;
454
455 if (device->discipline->online_to_ready) {
456 rc = device->discipline->online_to_ready(device);
457 if (rc)
458 return rc;
459 }
460
461 device->state = DASD_STATE_READY;
462 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
463 disk = device->block->bdev->bd_disk;
464 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
465 while ((part = disk_part_iter_next(&piter)))
466 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
467 disk_part_iter_exit(&piter);
468 }
469 return 0;
470 }
471
472 /*
473 * Device startup state changes.
474 */
475 static int dasd_increase_state(struct dasd_device *device)
476 {
477 int rc;
478
479 rc = 0;
480 if (device->state == DASD_STATE_NEW &&
481 device->target >= DASD_STATE_KNOWN)
482 rc = dasd_state_new_to_known(device);
483
484 if (!rc &&
485 device->state == DASD_STATE_KNOWN &&
486 device->target >= DASD_STATE_BASIC)
487 rc = dasd_state_known_to_basic(device);
488
489 if (!rc &&
490 device->state == DASD_STATE_BASIC &&
491 device->target >= DASD_STATE_READY)
492 rc = dasd_state_basic_to_ready(device);
493
494 if (!rc &&
495 device->state == DASD_STATE_UNFMT &&
496 device->target > DASD_STATE_UNFMT)
497 rc = -EPERM;
498
499 if (!rc &&
500 device->state == DASD_STATE_READY &&
501 device->target >= DASD_STATE_ONLINE)
502 rc = dasd_state_ready_to_online(device);
503
504 return rc;
505 }
506
507 /*
508 * Device shutdown state changes.
509 */
510 static int dasd_decrease_state(struct dasd_device *device)
511 {
512 int rc;
513
514 rc = 0;
515 if (device->state == DASD_STATE_ONLINE &&
516 device->target <= DASD_STATE_READY)
517 rc = dasd_state_online_to_ready(device);
518
519 if (!rc &&
520 device->state == DASD_STATE_READY &&
521 device->target <= DASD_STATE_BASIC)
522 rc = dasd_state_ready_to_basic(device);
523
524 if (!rc &&
525 device->state == DASD_STATE_UNFMT &&
526 device->target <= DASD_STATE_BASIC)
527 rc = dasd_state_unfmt_to_basic(device);
528
529 if (!rc &&
530 device->state == DASD_STATE_BASIC &&
531 device->target <= DASD_STATE_KNOWN)
532 rc = dasd_state_basic_to_known(device);
533
534 if (!rc &&
535 device->state == DASD_STATE_KNOWN &&
536 device->target <= DASD_STATE_NEW)
537 rc = dasd_state_known_to_new(device);
538
539 return rc;
540 }
541
542 /*
543 * This is the main startup/shutdown routine.
544 */
545 static void dasd_change_state(struct dasd_device *device)
546 {
547 int rc;
548
549 if (device->state == device->target)
550 /* Already where we want to go today... */
551 return;
552 if (device->state < device->target)
553 rc = dasd_increase_state(device);
554 else
555 rc = dasd_decrease_state(device);
556 if (rc == -EAGAIN)
557 return;
558 if (rc)
559 device->target = device->state;
560
561 /* let user-space know that the device status changed */
562 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
563
564 if (device->state == device->target)
565 wake_up(&dasd_init_waitq);
566 }
567
568 /*
569 * Kick starter for devices that did not complete the startup/shutdown
570 * procedure or were sleeping because of a pending state.
571 * dasd_kick_device will schedule a call do do_kick_device to the kernel
572 * event daemon.
573 */
574 static void do_kick_device(struct work_struct *work)
575 {
576 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
577 mutex_lock(&device->state_mutex);
578 dasd_change_state(device);
579 mutex_unlock(&device->state_mutex);
580 dasd_schedule_device_bh(device);
581 dasd_put_device(device);
582 }
583
584 void dasd_kick_device(struct dasd_device *device)
585 {
586 dasd_get_device(device);
587 /* queue call to dasd_kick_device to the kernel event daemon. */
588 if (!schedule_work(&device->kick_work))
589 dasd_put_device(device);
590 }
591 EXPORT_SYMBOL(dasd_kick_device);
592
593 /*
594 * dasd_reload_device will schedule a call do do_reload_device to the kernel
595 * event daemon.
596 */
597 static void do_reload_device(struct work_struct *work)
598 {
599 struct dasd_device *device = container_of(work, struct dasd_device,
600 reload_device);
601 device->discipline->reload(device);
602 dasd_put_device(device);
603 }
604
605 void dasd_reload_device(struct dasd_device *device)
606 {
607 dasd_get_device(device);
608 /* queue call to dasd_reload_device to the kernel event daemon. */
609 if (!schedule_work(&device->reload_device))
610 dasd_put_device(device);
611 }
612 EXPORT_SYMBOL(dasd_reload_device);
613
614 /*
615 * dasd_restore_device will schedule a call do do_restore_device to the kernel
616 * event daemon.
617 */
618 static void do_restore_device(struct work_struct *work)
619 {
620 struct dasd_device *device = container_of(work, struct dasd_device,
621 restore_device);
622 device->cdev->drv->restore(device->cdev);
623 dasd_put_device(device);
624 }
625
626 void dasd_restore_device(struct dasd_device *device)
627 {
628 dasd_get_device(device);
629 /* queue call to dasd_restore_device to the kernel event daemon. */
630 if (!schedule_work(&device->restore_device))
631 dasd_put_device(device);
632 }
633
634 /*
635 * Set the target state for a device and starts the state change.
636 */
637 void dasd_set_target_state(struct dasd_device *device, int target)
638 {
639 dasd_get_device(device);
640 mutex_lock(&device->state_mutex);
641 /* If we are in probeonly mode stop at DASD_STATE_READY. */
642 if (dasd_probeonly && target > DASD_STATE_READY)
643 target = DASD_STATE_READY;
644 if (device->target != target) {
645 if (device->state == target)
646 wake_up(&dasd_init_waitq);
647 device->target = target;
648 }
649 if (device->state != device->target)
650 dasd_change_state(device);
651 mutex_unlock(&device->state_mutex);
652 dasd_put_device(device);
653 }
654 EXPORT_SYMBOL(dasd_set_target_state);
655
656 /*
657 * Enable devices with device numbers in [from..to].
658 */
659 static inline int _wait_for_device(struct dasd_device *device)
660 {
661 return (device->state == device->target);
662 }
663
664 void dasd_enable_device(struct dasd_device *device)
665 {
666 dasd_set_target_state(device, DASD_STATE_ONLINE);
667 if (device->state <= DASD_STATE_KNOWN)
668 /* No discipline for device found. */
669 dasd_set_target_state(device, DASD_STATE_NEW);
670 /* Now wait for the devices to come up. */
671 wait_event(dasd_init_waitq, _wait_for_device(device));
672
673 dasd_reload_device(device);
674 if (device->discipline->kick_validate)
675 device->discipline->kick_validate(device);
676 }
677 EXPORT_SYMBOL(dasd_enable_device);
678
679 /*
680 * SECTION: device operation (interrupt handler, start i/o, term i/o ...)
681 */
682
683 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
684
685 #ifdef CONFIG_DASD_PROFILE
686 struct dasd_profile dasd_global_profile = {
687 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
688 };
689 static struct dentry *dasd_debugfs_global_entry;
690
691 /*
692 * Add profiling information for cqr before execution.
693 */
694 static void dasd_profile_start(struct dasd_block *block,
695 struct dasd_ccw_req *cqr,
696 struct request *req)
697 {
698 struct list_head *l;
699 unsigned int counter;
700 struct dasd_device *device;
701
702 /* count the length of the chanq for statistics */
703 counter = 0;
704 if (dasd_global_profile_level || block->profile.data)
705 list_for_each(l, &block->ccw_queue)
706 if (++counter >= 31)
707 break;
708
709 spin_lock(&dasd_global_profile.lock);
710 if (dasd_global_profile.data) {
711 dasd_global_profile.data->dasd_io_nr_req[counter]++;
712 if (rq_data_dir(req) == READ)
713 dasd_global_profile.data->dasd_read_nr_req[counter]++;
714 }
715 spin_unlock(&dasd_global_profile.lock);
716
717 spin_lock(&block->profile.lock);
718 if (block->profile.data) {
719 block->profile.data->dasd_io_nr_req[counter]++;
720 if (rq_data_dir(req) == READ)
721 block->profile.data->dasd_read_nr_req[counter]++;
722 }
723 spin_unlock(&block->profile.lock);
724
725 /*
726 * We count the request for the start device, even though it may run on
727 * some other device due to error recovery. This way we make sure that
728 * we count each request only once.
729 */
730 device = cqr->startdev;
731 if (device->profile.data) {
732 counter = 1; /* request is not yet queued on the start device */
733 list_for_each(l, &device->ccw_queue)
734 if (++counter >= 31)
735 break;
736 }
737 spin_lock(&device->profile.lock);
738 if (device->profile.data) {
739 device->profile.data->dasd_io_nr_req[counter]++;
740 if (rq_data_dir(req) == READ)
741 device->profile.data->dasd_read_nr_req[counter]++;
742 }
743 spin_unlock(&device->profile.lock);
744 }
745
746 /*
747 * Add profiling information for cqr after execution.
748 */
749
750 #define dasd_profile_counter(value, index) \
751 { \
752 for (index = 0; index < 31 && value >> (2+index); index++) \
753 ; \
754 }
755
756 static void dasd_profile_end_add_data(struct dasd_profile_info *data,
757 int is_alias,
758 int is_tpm,
759 int is_read,
760 long sectors,
761 int sectors_ind,
762 int tottime_ind,
763 int tottimeps_ind,
764 int strtime_ind,
765 int irqtime_ind,
766 int irqtimeps_ind,
767 int endtime_ind)
768 {
769 /* in case of an overflow, reset the whole profile */
770 if (data->dasd_io_reqs == UINT_MAX) {
771 memset(data, 0, sizeof(*data));
772 getnstimeofday(&data->starttod);
773 }
774 data->dasd_io_reqs++;
775 data->dasd_io_sects += sectors;
776 if (is_alias)
777 data->dasd_io_alias++;
778 if (is_tpm)
779 data->dasd_io_tpm++;
780
781 data->dasd_io_secs[sectors_ind]++;
782 data->dasd_io_times[tottime_ind]++;
783 data->dasd_io_timps[tottimeps_ind]++;
784 data->dasd_io_time1[strtime_ind]++;
785 data->dasd_io_time2[irqtime_ind]++;
786 data->dasd_io_time2ps[irqtimeps_ind]++;
787 data->dasd_io_time3[endtime_ind]++;
788
789 if (is_read) {
790 data->dasd_read_reqs++;
791 data->dasd_read_sects += sectors;
792 if (is_alias)
793 data->dasd_read_alias++;
794 if (is_tpm)
795 data->dasd_read_tpm++;
796 data->dasd_read_secs[sectors_ind]++;
797 data->dasd_read_times[tottime_ind]++;
798 data->dasd_read_time1[strtime_ind]++;
799 data->dasd_read_time2[irqtime_ind]++;
800 data->dasd_read_time3[endtime_ind]++;
801 }
802 }
803
804 static void dasd_profile_end(struct dasd_block *block,
805 struct dasd_ccw_req *cqr,
806 struct request *req)
807 {
808 long strtime, irqtime, endtime, tottime; /* in microseconds */
809 long tottimeps, sectors;
810 struct dasd_device *device;
811 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
812 int irqtime_ind, irqtimeps_ind, endtime_ind;
813
814 device = cqr->startdev;
815 if (!(dasd_global_profile_level ||
816 block->profile.data ||
817 device->profile.data))
818 return;
819
820 sectors = blk_rq_sectors(req);
821 if (!cqr->buildclk || !cqr->startclk ||
822 !cqr->stopclk || !cqr->endclk ||
823 !sectors)
824 return;
825
826 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
827 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
828 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
829 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
830 tottimeps = tottime / sectors;
831
832 dasd_profile_counter(sectors, sectors_ind);
833 dasd_profile_counter(tottime, tottime_ind);
834 dasd_profile_counter(tottimeps, tottimeps_ind);
835 dasd_profile_counter(strtime, strtime_ind);
836 dasd_profile_counter(irqtime, irqtime_ind);
837 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
838 dasd_profile_counter(endtime, endtime_ind);
839
840 spin_lock(&dasd_global_profile.lock);
841 if (dasd_global_profile.data) {
842 dasd_profile_end_add_data(dasd_global_profile.data,
843 cqr->startdev != block->base,
844 cqr->cpmode == 1,
845 rq_data_dir(req) == READ,
846 sectors, sectors_ind, tottime_ind,
847 tottimeps_ind, strtime_ind,
848 irqtime_ind, irqtimeps_ind,
849 endtime_ind);
850 }
851 spin_unlock(&dasd_global_profile.lock);
852
853 spin_lock(&block->profile.lock);
854 if (block->profile.data)
855 dasd_profile_end_add_data(block->profile.data,
856 cqr->startdev != block->base,
857 cqr->cpmode == 1,
858 rq_data_dir(req) == READ,
859 sectors, sectors_ind, tottime_ind,
860 tottimeps_ind, strtime_ind,
861 irqtime_ind, irqtimeps_ind,
862 endtime_ind);
863 spin_unlock(&block->profile.lock);
864
865 spin_lock(&device->profile.lock);
866 if (device->profile.data)
867 dasd_profile_end_add_data(device->profile.data,
868 cqr->startdev != block->base,
869 cqr->cpmode == 1,
870 rq_data_dir(req) == READ,
871 sectors, sectors_ind, tottime_ind,
872 tottimeps_ind, strtime_ind,
873 irqtime_ind, irqtimeps_ind,
874 endtime_ind);
875 spin_unlock(&device->profile.lock);
876 }
877
878 void dasd_profile_reset(struct dasd_profile *profile)
879 {
880 struct dasd_profile_info *data;
881
882 spin_lock_bh(&profile->lock);
883 data = profile->data;
884 if (!data) {
885 spin_unlock_bh(&profile->lock);
886 return;
887 }
888 memset(data, 0, sizeof(*data));
889 getnstimeofday(&data->starttod);
890 spin_unlock_bh(&profile->lock);
891 }
892
893 int dasd_profile_on(struct dasd_profile *profile)
894 {
895 struct dasd_profile_info *data;
896
897 data = kzalloc(sizeof(*data), GFP_KERNEL);
898 if (!data)
899 return -ENOMEM;
900 spin_lock_bh(&profile->lock);
901 if (profile->data) {
902 spin_unlock_bh(&profile->lock);
903 kfree(data);
904 return 0;
905 }
906 getnstimeofday(&data->starttod);
907 profile->data = data;
908 spin_unlock_bh(&profile->lock);
909 return 0;
910 }
911
912 void dasd_profile_off(struct dasd_profile *profile)
913 {
914 spin_lock_bh(&profile->lock);
915 kfree(profile->data);
916 profile->data = NULL;
917 spin_unlock_bh(&profile->lock);
918 }
919
920 char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
921 {
922 char *buffer;
923
924 buffer = vmalloc(user_len + 1);
925 if (buffer == NULL)
926 return ERR_PTR(-ENOMEM);
927 if (copy_from_user(buffer, user_buf, user_len) != 0) {
928 vfree(buffer);
929 return ERR_PTR(-EFAULT);
930 }
931 /* got the string, now strip linefeed. */
932 if (buffer[user_len - 1] == '\n')
933 buffer[user_len - 1] = 0;
934 else
935 buffer[user_len] = 0;
936 return buffer;
937 }
938
939 static ssize_t dasd_stats_write(struct file *file,
940 const char __user *user_buf,
941 size_t user_len, loff_t *pos)
942 {
943 char *buffer, *str;
944 int rc;
945 struct seq_file *m = (struct seq_file *)file->private_data;
946 struct dasd_profile *prof = m->private;
947
948 if (user_len > 65536)
949 user_len = 65536;
950 buffer = dasd_get_user_string(user_buf, user_len);
951 if (IS_ERR(buffer))
952 return PTR_ERR(buffer);
953
954 str = skip_spaces(buffer);
955 rc = user_len;
956 if (strncmp(str, "reset", 5) == 0) {
957 dasd_profile_reset(prof);
958 } else if (strncmp(str, "on", 2) == 0) {
959 rc = dasd_profile_on(prof);
960 if (rc)
961 goto out;
962 rc = user_len;
963 if (prof == &dasd_global_profile) {
964 dasd_profile_reset(prof);
965 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
966 }
967 } else if (strncmp(str, "off", 3) == 0) {
968 if (prof == &dasd_global_profile)
969 dasd_global_profile_level = DASD_PROFILE_OFF;
970 dasd_profile_off(prof);
971 } else
972 rc = -EINVAL;
973 out:
974 vfree(buffer);
975 return rc;
976 }
977
978 static void dasd_stats_array(struct seq_file *m, unsigned int *array)
979 {
980 int i;
981
982 for (i = 0; i < 32; i++)
983 seq_printf(m, "%u ", array[i]);
984 seq_putc(m, '\n');
985 }
986
987 static void dasd_stats_seq_print(struct seq_file *m,
988 struct dasd_profile_info *data)
989 {
990 seq_printf(m, "start_time %ld.%09ld\n",
991 data->starttod.tv_sec, data->starttod.tv_nsec);
992 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
993 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
994 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
995 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
996 seq_puts(m, "histogram_sectors ");
997 dasd_stats_array(m, data->dasd_io_secs);
998 seq_puts(m, "histogram_io_times ");
999 dasd_stats_array(m, data->dasd_io_times);
1000 seq_puts(m, "histogram_io_times_weighted ");
1001 dasd_stats_array(m, data->dasd_io_timps);
1002 seq_puts(m, "histogram_time_build_to_ssch ");
1003 dasd_stats_array(m, data->dasd_io_time1);
1004 seq_puts(m, "histogram_time_ssch_to_irq ");
1005 dasd_stats_array(m, data->dasd_io_time2);
1006 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
1007 dasd_stats_array(m, data->dasd_io_time2ps);
1008 seq_puts(m, "histogram_time_irq_to_end ");
1009 dasd_stats_array(m, data->dasd_io_time3);
1010 seq_puts(m, "histogram_ccw_queue_length ");
1011 dasd_stats_array(m, data->dasd_io_nr_req);
1012 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1013 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1014 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1015 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
1016 seq_puts(m, "histogram_read_sectors ");
1017 dasd_stats_array(m, data->dasd_read_secs);
1018 seq_puts(m, "histogram_read_times ");
1019 dasd_stats_array(m, data->dasd_read_times);
1020 seq_puts(m, "histogram_read_time_build_to_ssch ");
1021 dasd_stats_array(m, data->dasd_read_time1);
1022 seq_puts(m, "histogram_read_time_ssch_to_irq ");
1023 dasd_stats_array(m, data->dasd_read_time2);
1024 seq_puts(m, "histogram_read_time_irq_to_end ");
1025 dasd_stats_array(m, data->dasd_read_time3);
1026 seq_puts(m, "histogram_read_ccw_queue_length ");
1027 dasd_stats_array(m, data->dasd_read_nr_req);
1028 }
1029
1030 static int dasd_stats_show(struct seq_file *m, void *v)
1031 {
1032 struct dasd_profile *profile;
1033 struct dasd_profile_info *data;
1034
1035 profile = m->private;
1036 spin_lock_bh(&profile->lock);
1037 data = profile->data;
1038 if (!data) {
1039 spin_unlock_bh(&profile->lock);
1040 seq_puts(m, "disabled\n");
1041 return 0;
1042 }
1043 dasd_stats_seq_print(m, data);
1044 spin_unlock_bh(&profile->lock);
1045 return 0;
1046 }
1047
1048 static int dasd_stats_open(struct inode *inode, struct file *file)
1049 {
1050 struct dasd_profile *profile = inode->i_private;
1051 return single_open(file, dasd_stats_show, profile);
1052 }
1053
1054 static const struct file_operations dasd_stats_raw_fops = {
1055 .owner = THIS_MODULE,
1056 .open = dasd_stats_open,
1057 .read = seq_read,
1058 .llseek = seq_lseek,
1059 .release = single_release,
1060 .write = dasd_stats_write,
1061 };
1062
1063 static void dasd_profile_init(struct dasd_profile *profile,
1064 struct dentry *base_dentry)
1065 {
1066 umode_t mode;
1067 struct dentry *pde;
1068
1069 if (!base_dentry)
1070 return;
1071 profile->dentry = NULL;
1072 profile->data = NULL;
1073 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1074 pde = debugfs_create_file("statistics", mode, base_dentry,
1075 profile, &dasd_stats_raw_fops);
1076 if (pde && !IS_ERR(pde))
1077 profile->dentry = pde;
1078 return;
1079 }
1080
1081 static void dasd_profile_exit(struct dasd_profile *profile)
1082 {
1083 dasd_profile_off(profile);
1084 debugfs_remove(profile->dentry);
1085 profile->dentry = NULL;
1086 }
1087
1088 static void dasd_statistics_removeroot(void)
1089 {
1090 dasd_global_profile_level = DASD_PROFILE_OFF;
1091 dasd_profile_exit(&dasd_global_profile);
1092 debugfs_remove(dasd_debugfs_global_entry);
1093 debugfs_remove(dasd_debugfs_root_entry);
1094 }
1095
1096 static void dasd_statistics_createroot(void)
1097 {
1098 struct dentry *pde;
1099
1100 dasd_debugfs_root_entry = NULL;
1101 pde = debugfs_create_dir("dasd", NULL);
1102 if (!pde || IS_ERR(pde))
1103 goto error;
1104 dasd_debugfs_root_entry = pde;
1105 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1106 if (!pde || IS_ERR(pde))
1107 goto error;
1108 dasd_debugfs_global_entry = pde;
1109 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
1110 return;
1111
1112 error:
1113 DBF_EVENT(DBF_ERR, "%s",
1114 "Creation of the dasd debugfs interface failed");
1115 dasd_statistics_removeroot();
1116 return;
1117 }
1118
1119 #else
1120 #define dasd_profile_start(block, cqr, req) do {} while (0)
1121 #define dasd_profile_end(block, cqr, req) do {} while (0)
1122
1123 static void dasd_statistics_createroot(void)
1124 {
1125 return;
1126 }
1127
1128 static void dasd_statistics_removeroot(void)
1129 {
1130 return;
1131 }
1132
1133 int dasd_stats_generic_show(struct seq_file *m, void *v)
1134 {
1135 seq_puts(m, "Statistics are not activated in this kernel\n");
1136 return 0;
1137 }
1138
1139 static void dasd_profile_init(struct dasd_profile *profile,
1140 struct dentry *base_dentry)
1141 {
1142 return;
1143 }
1144
1145 static void dasd_profile_exit(struct dasd_profile *profile)
1146 {
1147 return;
1148 }
1149
1150 int dasd_profile_on(struct dasd_profile *profile)
1151 {
1152 return 0;
1153 }
1154
1155 #endif /* CONFIG_DASD_PROFILE */
1156
1157 static int dasd_hosts_show(struct seq_file *m, void *v)
1158 {
1159 struct dasd_device *device;
1160 int rc = -EOPNOTSUPP;
1161
1162 device = m->private;
1163 dasd_get_device(device);
1164
1165 if (device->discipline->hosts_print)
1166 rc = device->discipline->hosts_print(device, m);
1167
1168 dasd_put_device(device);
1169 return rc;
1170 }
1171
1172 static int dasd_hosts_open(struct inode *inode, struct file *file)
1173 {
1174 struct dasd_device *device = inode->i_private;
1175
1176 return single_open(file, dasd_hosts_show, device);
1177 }
1178
1179 static const struct file_operations dasd_hosts_fops = {
1180 .owner = THIS_MODULE,
1181 .open = dasd_hosts_open,
1182 .read = seq_read,
1183 .llseek = seq_lseek,
1184 .release = single_release,
1185 };
1186
1187 static void dasd_hosts_exit(struct dasd_device *device)
1188 {
1189 debugfs_remove(device->hosts_dentry);
1190 device->hosts_dentry = NULL;
1191 }
1192
1193 static void dasd_hosts_init(struct dentry *base_dentry,
1194 struct dasd_device *device)
1195 {
1196 struct dentry *pde;
1197 umode_t mode;
1198
1199 if (!base_dentry)
1200 return;
1201
1202 mode = S_IRUSR | S_IFREG;
1203 pde = debugfs_create_file("host_access_list", mode, base_dentry,
1204 device, &dasd_hosts_fops);
1205 if (pde && !IS_ERR(pde))
1206 device->hosts_dentry = pde;
1207 }
1208
1209 /*
1210 * Allocate memory for a channel program with 'cplength' channel
1211 * command words and 'datasize' additional space. There are two
1212 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
1213 * memory and 2) dasd_smalloc_request uses the static ccw memory
1214 * that gets allocated for each device.
1215 */
1216 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1217 int datasize,
1218 struct dasd_device *device)
1219 {
1220 struct dasd_ccw_req *cqr;
1221
1222 /* Sanity checks */
1223 BUG_ON(datasize > PAGE_SIZE ||
1224 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1225
1226 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1227 if (cqr == NULL)
1228 return ERR_PTR(-ENOMEM);
1229 cqr->cpaddr = NULL;
1230 if (cplength > 0) {
1231 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1232 GFP_ATOMIC | GFP_DMA);
1233 if (cqr->cpaddr == NULL) {
1234 kfree(cqr);
1235 return ERR_PTR(-ENOMEM);
1236 }
1237 }
1238 cqr->data = NULL;
1239 if (datasize > 0) {
1240 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1241 if (cqr->data == NULL) {
1242 kfree(cqr->cpaddr);
1243 kfree(cqr);
1244 return ERR_PTR(-ENOMEM);
1245 }
1246 }
1247 cqr->magic = magic;
1248 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1249 dasd_get_device(device);
1250 return cqr;
1251 }
1252 EXPORT_SYMBOL(dasd_kmalloc_request);
1253
1254 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1255 int datasize,
1256 struct dasd_device *device)
1257 {
1258 unsigned long flags;
1259 struct dasd_ccw_req *cqr;
1260 char *data;
1261 int size;
1262
1263 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1264 if (cplength > 0)
1265 size += cplength * sizeof(struct ccw1);
1266 if (datasize > 0)
1267 size += datasize;
1268 spin_lock_irqsave(&device->mem_lock, flags);
1269 cqr = (struct dasd_ccw_req *)
1270 dasd_alloc_chunk(&device->ccw_chunks, size);
1271 spin_unlock_irqrestore(&device->mem_lock, flags);
1272 if (cqr == NULL)
1273 return ERR_PTR(-ENOMEM);
1274 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1275 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1276 cqr->cpaddr = NULL;
1277 if (cplength > 0) {
1278 cqr->cpaddr = (struct ccw1 *) data;
1279 data += cplength*sizeof(struct ccw1);
1280 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1281 }
1282 cqr->data = NULL;
1283 if (datasize > 0) {
1284 cqr->data = data;
1285 memset(cqr->data, 0, datasize);
1286 }
1287 cqr->magic = magic;
1288 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1289 dasd_get_device(device);
1290 return cqr;
1291 }
1292 EXPORT_SYMBOL(dasd_smalloc_request);
1293
1294 /*
1295 * Free memory of a channel program. This function needs to free all the
1296 * idal lists that might have been created by dasd_set_cda and the
1297 * struct dasd_ccw_req itself.
1298 */
1299 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1300 {
1301 struct ccw1 *ccw;
1302
1303 /* Clear any idals used for the request. */
1304 ccw = cqr->cpaddr;
1305 do {
1306 clear_normalized_cda(ccw);
1307 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1308 kfree(cqr->cpaddr);
1309 kfree(cqr->data);
1310 kfree(cqr);
1311 dasd_put_device(device);
1312 }
1313 EXPORT_SYMBOL(dasd_kfree_request);
1314
1315 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1316 {
1317 unsigned long flags;
1318
1319 spin_lock_irqsave(&device->mem_lock, flags);
1320 dasd_free_chunk(&device->ccw_chunks, cqr);
1321 spin_unlock_irqrestore(&device->mem_lock, flags);
1322 dasd_put_device(device);
1323 }
1324 EXPORT_SYMBOL(dasd_sfree_request);
1325
1326 /*
1327 * Check discipline magic in cqr.
1328 */
1329 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1330 {
1331 struct dasd_device *device;
1332
1333 if (cqr == NULL)
1334 return -EINVAL;
1335 device = cqr->startdev;
1336 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1337 DBF_DEV_EVENT(DBF_WARNING, device,
1338 " dasd_ccw_req 0x%08x magic doesn't match"
1339 " discipline 0x%08x",
1340 cqr->magic,
1341 *(unsigned int *) device->discipline->name);
1342 return -EINVAL;
1343 }
1344 return 0;
1345 }
1346
1347 /*
1348 * Terminate the current i/o and set the request to clear_pending.
1349 * Timer keeps device runnig.
1350 * ccw_device_clear can fail if the i/o subsystem
1351 * is in a bad mood.
1352 */
1353 int dasd_term_IO(struct dasd_ccw_req *cqr)
1354 {
1355 struct dasd_device *device;
1356 int retries, rc;
1357 char errorstring[ERRORLENGTH];
1358
1359 /* Check the cqr */
1360 rc = dasd_check_cqr(cqr);
1361 if (rc)
1362 return rc;
1363 retries = 0;
1364 device = (struct dasd_device *) cqr->startdev;
1365 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1366 rc = ccw_device_clear(device->cdev, (long) cqr);
1367 switch (rc) {
1368 case 0: /* termination successful */
1369 cqr->status = DASD_CQR_CLEAR_PENDING;
1370 cqr->stopclk = get_tod_clock();
1371 cqr->starttime = 0;
1372 DBF_DEV_EVENT(DBF_DEBUG, device,
1373 "terminate cqr %p successful",
1374 cqr);
1375 break;
1376 case -ENODEV:
1377 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1378 "device gone, retry");
1379 break;
1380 case -EIO:
1381 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1382 "I/O error, retry");
1383 break;
1384 case -EINVAL:
1385 /*
1386 * device not valid so no I/O could be running
1387 * handle CQR as termination successful
1388 */
1389 cqr->status = DASD_CQR_CLEARED;
1390 cqr->stopclk = get_tod_clock();
1391 cqr->starttime = 0;
1392 /* no retries for invalid devices */
1393 cqr->retries = -1;
1394 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1395 "EINVAL, handle as terminated");
1396 /* fake rc to success */
1397 rc = 0;
1398 break;
1399 case -EBUSY:
1400 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1401 "device busy, retry later");
1402 break;
1403 default:
1404 /* internal error 10 - unknown rc*/
1405 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1406 dev_err(&device->cdev->dev, "An error occurred in the "
1407 "DASD device driver, reason=%s\n", errorstring);
1408 BUG();
1409 break;
1410 }
1411 retries++;
1412 }
1413 dasd_schedule_device_bh(device);
1414 return rc;
1415 }
1416 EXPORT_SYMBOL(dasd_term_IO);
1417
1418 /*
1419 * Start the i/o. This start_IO can fail if the channel is really busy.
1420 * In that case set up a timer to start the request later.
1421 */
1422 int dasd_start_IO(struct dasd_ccw_req *cqr)
1423 {
1424 struct dasd_device *device;
1425 int rc;
1426 char errorstring[ERRORLENGTH];
1427
1428 /* Check the cqr */
1429 rc = dasd_check_cqr(cqr);
1430 if (rc) {
1431 cqr->intrc = rc;
1432 return rc;
1433 }
1434 device = (struct dasd_device *) cqr->startdev;
1435 if (((cqr->block &&
1436 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1437 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1438 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1439 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1440 "because of stolen lock", cqr);
1441 cqr->status = DASD_CQR_ERROR;
1442 cqr->intrc = -EPERM;
1443 return -EPERM;
1444 }
1445 if (cqr->retries < 0) {
1446 /* internal error 14 - start_IO run out of retries */
1447 sprintf(errorstring, "14 %p", cqr);
1448 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1449 "device driver, reason=%s\n", errorstring);
1450 cqr->status = DASD_CQR_ERROR;
1451 return -EIO;
1452 }
1453 cqr->startclk = get_tod_clock();
1454 cqr->starttime = jiffies;
1455 cqr->retries--;
1456 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1457 cqr->lpm &= device->path_data.opm;
1458 if (!cqr->lpm)
1459 cqr->lpm = device->path_data.opm;
1460 }
1461 if (cqr->cpmode == 1) {
1462 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1463 (long) cqr, cqr->lpm);
1464 } else {
1465 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1466 (long) cqr, cqr->lpm, 0);
1467 }
1468 switch (rc) {
1469 case 0:
1470 cqr->status = DASD_CQR_IN_IO;
1471 break;
1472 case -EBUSY:
1473 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1474 "start_IO: device busy, retry later");
1475 break;
1476 case -ETIMEDOUT:
1477 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1478 "start_IO: request timeout, retry later");
1479 break;
1480 case -EACCES:
1481 /* -EACCES indicates that the request used only a subset of the
1482 * available paths and all these paths are gone. If the lpm of
1483 * this request was only a subset of the opm (e.g. the ppm) then
1484 * we just do a retry with all available paths.
1485 * If we already use the full opm, something is amiss, and we
1486 * need a full path verification.
1487 */
1488 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1489 DBF_DEV_EVENT(DBF_WARNING, device,
1490 "start_IO: selected paths gone (%x)",
1491 cqr->lpm);
1492 } else if (cqr->lpm != device->path_data.opm) {
1493 cqr->lpm = device->path_data.opm;
1494 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1495 "start_IO: selected paths gone,"
1496 " retry on all paths");
1497 } else {
1498 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1499 "start_IO: all paths in opm gone,"
1500 " do path verification");
1501 dasd_generic_last_path_gone(device);
1502 device->path_data.opm = 0;
1503 device->path_data.ppm = 0;
1504 device->path_data.npm = 0;
1505 device->path_data.tbvpm =
1506 ccw_device_get_path_mask(device->cdev);
1507 }
1508 break;
1509 case -ENODEV:
1510 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1511 "start_IO: -ENODEV device gone, retry");
1512 break;
1513 case -EIO:
1514 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1515 "start_IO: -EIO device gone, retry");
1516 break;
1517 case -EINVAL:
1518 /* most likely caused in power management context */
1519 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1520 "start_IO: -EINVAL device currently "
1521 "not accessible");
1522 break;
1523 default:
1524 /* internal error 11 - unknown rc */
1525 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1526 dev_err(&device->cdev->dev,
1527 "An error occurred in the DASD device driver, "
1528 "reason=%s\n", errorstring);
1529 BUG();
1530 break;
1531 }
1532 cqr->intrc = rc;
1533 return rc;
1534 }
1535 EXPORT_SYMBOL(dasd_start_IO);
1536
1537 /*
1538 * Timeout function for dasd devices. This is used for different purposes
1539 * 1) missing interrupt handler for normal operation
1540 * 2) delayed start of request where start_IO failed with -EBUSY
1541 * 3) timeout for missing state change interrupts
1542 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1),
1543 * DASD_CQR_QUEUED for 2) and 3).
1544 */
1545 static void dasd_device_timeout(unsigned long ptr)
1546 {
1547 unsigned long flags;
1548 struct dasd_device *device;
1549
1550 device = (struct dasd_device *) ptr;
1551 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1552 /* re-activate request queue */
1553 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1554 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1555 dasd_schedule_device_bh(device);
1556 }
1557
1558 /*
1559 * Setup timeout for a device in jiffies.
1560 */
1561 void dasd_device_set_timer(struct dasd_device *device, int expires)
1562 {
1563 if (expires == 0)
1564 del_timer(&device->timer);
1565 else
1566 mod_timer(&device->timer, jiffies + expires);
1567 }
1568 EXPORT_SYMBOL(dasd_device_set_timer);
1569
1570 /*
1571 * Clear timeout for a device.
1572 */
1573 void dasd_device_clear_timer(struct dasd_device *device)
1574 {
1575 del_timer(&device->timer);
1576 }
1577 EXPORT_SYMBOL(dasd_device_clear_timer);
1578
1579 static void dasd_handle_killed_request(struct ccw_device *cdev,
1580 unsigned long intparm)
1581 {
1582 struct dasd_ccw_req *cqr;
1583 struct dasd_device *device;
1584
1585 if (!intparm)
1586 return;
1587 cqr = (struct dasd_ccw_req *) intparm;
1588 if (cqr->status != DASD_CQR_IN_IO) {
1589 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1590 "invalid status in handle_killed_request: "
1591 "%02x", cqr->status);
1592 return;
1593 }
1594
1595 device = dasd_device_from_cdev_locked(cdev);
1596 if (IS_ERR(device)) {
1597 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1598 "unable to get device from cdev");
1599 return;
1600 }
1601
1602 if (!cqr->startdev ||
1603 device != cqr->startdev ||
1604 strncmp(cqr->startdev->discipline->ebcname,
1605 (char *) &cqr->magic, 4)) {
1606 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1607 "invalid device in request");
1608 dasd_put_device(device);
1609 return;
1610 }
1611
1612 /* Schedule request to be retried. */
1613 cqr->status = DASD_CQR_QUEUED;
1614
1615 dasd_device_clear_timer(device);
1616 dasd_schedule_device_bh(device);
1617 dasd_put_device(device);
1618 }
1619
1620 void dasd_generic_handle_state_change(struct dasd_device *device)
1621 {
1622 /* First of all start sense subsystem status request. */
1623 dasd_eer_snss(device);
1624
1625 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1626 dasd_schedule_device_bh(device);
1627 if (device->block)
1628 dasd_schedule_block_bh(device->block);
1629 }
1630 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1631
1632 /*
1633 * Interrupt handler for "normal" ssch-io based dasd devices.
1634 */
1635 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1636 struct irb *irb)
1637 {
1638 struct dasd_ccw_req *cqr, *next;
1639 struct dasd_device *device;
1640 unsigned long long now;
1641 int nrf_suppressed = 0;
1642 int fp_suppressed = 0;
1643 u8 *sense = NULL;
1644 int expires;
1645
1646 cqr = (struct dasd_ccw_req *) intparm;
1647 if (IS_ERR(irb)) {
1648 switch (PTR_ERR(irb)) {
1649 case -EIO:
1650 if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
1651 device = (struct dasd_device *) cqr->startdev;
1652 cqr->status = DASD_CQR_CLEARED;
1653 dasd_device_clear_timer(device);
1654 wake_up(&dasd_flush_wq);
1655 dasd_schedule_device_bh(device);
1656 return;
1657 }
1658 break;
1659 case -ETIMEDOUT:
1660 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1661 "request timed out\n", __func__);
1662 break;
1663 default:
1664 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1665 "unknown error %ld\n", __func__,
1666 PTR_ERR(irb));
1667 }
1668 dasd_handle_killed_request(cdev, intparm);
1669 return;
1670 }
1671
1672 now = get_tod_clock();
1673 /* check for conditions that should be handled immediately */
1674 if (!cqr ||
1675 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1676 scsw_cstat(&irb->scsw) == 0)) {
1677 if (cqr)
1678 memcpy(&cqr->irb, irb, sizeof(*irb));
1679 device = dasd_device_from_cdev_locked(cdev);
1680 if (IS_ERR(device))
1681 return;
1682 /* ignore unsolicited interrupts for DIAG discipline */
1683 if (device->discipline == dasd_diag_discipline_pointer) {
1684 dasd_put_device(device);
1685 return;
1686 }
1687
1688 /*
1689 * In some cases 'File Protected' or 'No Record Found' errors
1690 * might be expected and debug log messages for the
1691 * corresponding interrupts shouldn't be written then.
1692 * Check if either of the according suppress bits is set.
1693 */
1694 sense = dasd_get_sense(irb);
1695 if (sense) {
1696 fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
1697 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
1698 nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
1699 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
1700 }
1701 if (!(fp_suppressed || nrf_suppressed))
1702 device->discipline->dump_sense_dbf(device, irb, "int");
1703
1704 if (device->features & DASD_FEATURE_ERPLOG)
1705 device->discipline->dump_sense(device, cqr, irb);
1706 device->discipline->check_for_device_change(device, cqr, irb);
1707 dasd_put_device(device);
1708 }
1709
1710 /* check for for attention message */
1711 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1712 device = dasd_device_from_cdev_locked(cdev);
1713 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1714 dasd_put_device(device);
1715 }
1716
1717 if (!cqr)
1718 return;
1719
1720 device = (struct dasd_device *) cqr->startdev;
1721 if (!device ||
1722 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1723 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1724 "invalid device in request");
1725 return;
1726 }
1727
1728 /* Check for clear pending */
1729 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1730 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1731 cqr->status = DASD_CQR_CLEARED;
1732 dasd_device_clear_timer(device);
1733 wake_up(&dasd_flush_wq);
1734 dasd_schedule_device_bh(device);
1735 return;
1736 }
1737
1738 /* check status - the request might have been killed by dyn detach */
1739 if (cqr->status != DASD_CQR_IN_IO) {
1740 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1741 "status %02x", dev_name(&cdev->dev), cqr->status);
1742 return;
1743 }
1744
1745 next = NULL;
1746 expires = 0;
1747 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1748 scsw_cstat(&irb->scsw) == 0) {
1749 /* request was completed successfully */
1750 cqr->status = DASD_CQR_SUCCESS;
1751 cqr->stopclk = now;
1752 /* Start first request on queue if possible -> fast_io. */
1753 if (cqr->devlist.next != &device->ccw_queue) {
1754 next = list_entry(cqr->devlist.next,
1755 struct dasd_ccw_req, devlist);
1756 }
1757 } else { /* error */
1758 /*
1759 * If we don't want complex ERP for this request, then just
1760 * reset this and retry it in the fastpath
1761 */
1762 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1763 cqr->retries > 0) {
1764 if (cqr->lpm == device->path_data.opm)
1765 DBF_DEV_EVENT(DBF_DEBUG, device,
1766 "default ERP in fastpath "
1767 "(%i retries left)",
1768 cqr->retries);
1769 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1770 cqr->lpm = device->path_data.opm;
1771 cqr->status = DASD_CQR_QUEUED;
1772 next = cqr;
1773 } else
1774 cqr->status = DASD_CQR_ERROR;
1775 }
1776 if (next && (next->status == DASD_CQR_QUEUED) &&
1777 (!device->stopped)) {
1778 if (device->discipline->start_IO(next) == 0)
1779 expires = next->expires;
1780 }
1781 if (expires != 0)
1782 dasd_device_set_timer(device, expires);
1783 else
1784 dasd_device_clear_timer(device);
1785 dasd_schedule_device_bh(device);
1786 }
1787 EXPORT_SYMBOL(dasd_int_handler);
1788
1789 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1790 {
1791 struct dasd_device *device;
1792
1793 device = dasd_device_from_cdev_locked(cdev);
1794
1795 if (IS_ERR(device))
1796 goto out;
1797 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1798 device->state != device->target ||
1799 !device->discipline->check_for_device_change){
1800 dasd_put_device(device);
1801 goto out;
1802 }
1803 if (device->discipline->dump_sense_dbf)
1804 device->discipline->dump_sense_dbf(device, irb, "uc");
1805 device->discipline->check_for_device_change(device, NULL, irb);
1806 dasd_put_device(device);
1807 out:
1808 return UC_TODO_RETRY;
1809 }
1810 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1811
1812 /*
1813 * If we have an error on a dasd_block layer request then we cancel
1814 * and return all further requests from the same dasd_block as well.
1815 */
1816 static void __dasd_device_recovery(struct dasd_device *device,
1817 struct dasd_ccw_req *ref_cqr)
1818 {
1819 struct list_head *l, *n;
1820 struct dasd_ccw_req *cqr;
1821
1822 /*
1823 * only requeue request that came from the dasd_block layer
1824 */
1825 if (!ref_cqr->block)
1826 return;
1827
1828 list_for_each_safe(l, n, &device->ccw_queue) {
1829 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1830 if (cqr->status == DASD_CQR_QUEUED &&
1831 ref_cqr->block == cqr->block) {
1832 cqr->status = DASD_CQR_CLEARED;
1833 }
1834 }
1835 };
1836
1837 /*
1838 * Remove those ccw requests from the queue that need to be returned
1839 * to the upper layer.
1840 */
1841 static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1842 struct list_head *final_queue)
1843 {
1844 struct list_head *l, *n;
1845 struct dasd_ccw_req *cqr;
1846
1847 /* Process request with final status. */
1848 list_for_each_safe(l, n, &device->ccw_queue) {
1849 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1850
1851 /* Skip any non-final request. */
1852 if (cqr->status == DASD_CQR_QUEUED ||
1853 cqr->status == DASD_CQR_IN_IO ||
1854 cqr->status == DASD_CQR_CLEAR_PENDING)
1855 continue;
1856 if (cqr->status == DASD_CQR_ERROR) {
1857 __dasd_device_recovery(device, cqr);
1858 }
1859 /* Rechain finished requests to final queue */
1860 list_move_tail(&cqr->devlist, final_queue);
1861 }
1862 }
1863
1864 /*
1865 * the cqrs from the final queue are returned to the upper layer
1866 * by setting a dasd_block state and calling the callback function
1867 */
1868 static void __dasd_device_process_final_queue(struct dasd_device *device,
1869 struct list_head *final_queue)
1870 {
1871 struct list_head *l, *n;
1872 struct dasd_ccw_req *cqr;
1873 struct dasd_block *block;
1874 void (*callback)(struct dasd_ccw_req *, void *data);
1875 void *callback_data;
1876 char errorstring[ERRORLENGTH];
1877
1878 list_for_each_safe(l, n, final_queue) {
1879 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1880 list_del_init(&cqr->devlist);
1881 block = cqr->block;
1882 callback = cqr->callback;
1883 callback_data = cqr->callback_data;
1884 if (block)
1885 spin_lock_bh(&block->queue_lock);
1886 switch (cqr->status) {
1887 case DASD_CQR_SUCCESS:
1888 cqr->status = DASD_CQR_DONE;
1889 break;
1890 case DASD_CQR_ERROR:
1891 cqr->status = DASD_CQR_NEED_ERP;
1892 break;
1893 case DASD_CQR_CLEARED:
1894 cqr->status = DASD_CQR_TERMINATED;
1895 break;
1896 default:
1897 /* internal error 12 - wrong cqr status*/
1898 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1899 dev_err(&device->cdev->dev,
1900 "An error occurred in the DASD device driver, "
1901 "reason=%s\n", errorstring);
1902 BUG();
1903 }
1904 if (cqr->callback != NULL)
1905 (callback)(cqr, callback_data);
1906 if (block)
1907 spin_unlock_bh(&block->queue_lock);
1908 }
1909 }
1910
1911 /*
1912 * Take a look at the first request on the ccw queue and check
1913 * if it reached its expire time. If so, terminate the IO.
1914 */
1915 static void __dasd_device_check_expire(struct dasd_device *device)
1916 {
1917 struct dasd_ccw_req *cqr;
1918
1919 if (list_empty(&device->ccw_queue))
1920 return;
1921 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1922 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1923 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1924 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1925 /*
1926 * IO in safe offline processing should not
1927 * run out of retries
1928 */
1929 cqr->retries++;
1930 }
1931 if (device->discipline->term_IO(cqr) != 0) {
1932 /* Hmpf, try again in 5 sec */
1933 dev_err(&device->cdev->dev,
1934 "cqr %p timed out (%lus) but cannot be "
1935 "ended, retrying in 5 s\n",
1936 cqr, (cqr->expires/HZ));
1937 cqr->expires += 5*HZ;
1938 dasd_device_set_timer(device, 5*HZ);
1939 } else {
1940 dev_err(&device->cdev->dev,
1941 "cqr %p timed out (%lus), %i retries "
1942 "remaining\n", cqr, (cqr->expires/HZ),
1943 cqr->retries);
1944 }
1945 }
1946 }
1947
1948 /*
1949 * return 1 when device is not eligible for IO
1950 */
1951 static int __dasd_device_is_unusable(struct dasd_device *device,
1952 struct dasd_ccw_req *cqr)
1953 {
1954 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1955
1956 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1957 /* dasd is being set offline. */
1958 return 1;
1959 }
1960 if (device->stopped) {
1961 if (device->stopped & mask) {
1962 /* stopped and CQR will not change that. */
1963 return 1;
1964 }
1965 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1966 /* CQR is not able to change device to
1967 * operational. */
1968 return 1;
1969 }
1970 /* CQR required to get device operational. */
1971 }
1972 return 0;
1973 }
1974
1975 /*
1976 * Take a look at the first request on the ccw queue and check
1977 * if it needs to be started.
1978 */
1979 static void __dasd_device_start_head(struct dasd_device *device)
1980 {
1981 struct dasd_ccw_req *cqr;
1982 int rc;
1983
1984 if (list_empty(&device->ccw_queue))
1985 return;
1986 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1987 if (cqr->status != DASD_CQR_QUEUED)
1988 return;
1989 /* if device is not usable return request to upper layer */
1990 if (__dasd_device_is_unusable(device, cqr)) {
1991 cqr->intrc = -EAGAIN;
1992 cqr->status = DASD_CQR_CLEARED;
1993 dasd_schedule_device_bh(device);
1994 return;
1995 }
1996
1997 rc = device->discipline->start_IO(cqr);
1998 if (rc == 0)
1999 dasd_device_set_timer(device, cqr->expires);
2000 else if (rc == -EACCES) {
2001 dasd_schedule_device_bh(device);
2002 } else
2003 /* Hmpf, try again in 1/2 sec */
2004 dasd_device_set_timer(device, 50);
2005 }
2006
2007 static void __dasd_device_check_path_events(struct dasd_device *device)
2008 {
2009 int rc;
2010
2011 if (device->path_data.tbvpm) {
2012 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
2013 DASD_UNRESUMED_PM))
2014 return;
2015 rc = device->discipline->verify_path(
2016 device, device->path_data.tbvpm);
2017 if (rc)
2018 dasd_device_set_timer(device, 50);
2019 else
2020 device->path_data.tbvpm = 0;
2021 }
2022 };
2023
2024 /*
2025 * Go through all request on the dasd_device request queue,
2026 * terminate them on the cdev if necessary, and return them to the
2027 * submitting layer via callback.
2028 * Note:
2029 * Make sure that all 'submitting layers' still exist when
2030 * this function is called!. In other words, when 'device' is a base
2031 * device then all block layer requests must have been removed before
2032 * via dasd_flush_block_queue.
2033 */
2034 int dasd_flush_device_queue(struct dasd_device *device)
2035 {
2036 struct dasd_ccw_req *cqr, *n;
2037 int rc;
2038 struct list_head flush_queue;
2039
2040 INIT_LIST_HEAD(&flush_queue);
2041 spin_lock_irq(get_ccwdev_lock(device->cdev));
2042 rc = 0;
2043 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2044 /* Check status and move request to flush_queue */
2045 switch (cqr->status) {
2046 case DASD_CQR_IN_IO:
2047 rc = device->discipline->term_IO(cqr);
2048 if (rc) {
2049 /* unable to terminate requeust */
2050 dev_err(&device->cdev->dev,
2051 "Flushing the DASD request queue "
2052 "failed for request %p\n", cqr);
2053 /* stop flush processing */
2054 goto finished;
2055 }
2056 break;
2057 case DASD_CQR_QUEUED:
2058 cqr->stopclk = get_tod_clock();
2059 cqr->status = DASD_CQR_CLEARED;
2060 break;
2061 default: /* no need to modify the others */
2062 break;
2063 }
2064 list_move_tail(&cqr->devlist, &flush_queue);
2065 }
2066 finished:
2067 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2068 /*
2069 * After this point all requests must be in state CLEAR_PENDING,
2070 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become
2071 * one of the others.
2072 */
2073 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
2074 wait_event(dasd_flush_wq,
2075 (cqr->status != DASD_CQR_CLEAR_PENDING));
2076 /*
2077 * Now set each request back to TERMINATED, DONE or NEED_ERP
2078 * and call the callback function of flushed requests
2079 */
2080 __dasd_device_process_final_queue(device, &flush_queue);
2081 return rc;
2082 }
2083 EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2084
2085 /*
2086 * Acquire the device lock and process queues for the device.
2087 */
2088 static void dasd_device_tasklet(struct dasd_device *device)
2089 {
2090 struct list_head final_queue;
2091
2092 atomic_set (&device->tasklet_scheduled, 0);
2093 INIT_LIST_HEAD(&final_queue);
2094 spin_lock_irq(get_ccwdev_lock(device->cdev));
2095 /* Check expire time of first request on the ccw queue. */
2096 __dasd_device_check_expire(device);
2097 /* find final requests on ccw queue */
2098 __dasd_device_process_ccw_queue(device, &final_queue);
2099 __dasd_device_check_path_events(device);
2100 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2101 /* Now call the callback function of requests with final status */
2102 __dasd_device_process_final_queue(device, &final_queue);
2103 spin_lock_irq(get_ccwdev_lock(device->cdev));
2104 /* Now check if the head of the ccw queue needs to be started. */
2105 __dasd_device_start_head(device);
2106 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2107 if (waitqueue_active(&shutdown_waitq))
2108 wake_up(&shutdown_waitq);
2109 dasd_put_device(device);
2110 }
2111
2112 /*
2113 * Schedules a call to dasd_tasklet over the device tasklet.
2114 */
2115 void dasd_schedule_device_bh(struct dasd_device *device)
2116 {
2117 /* Protect against rescheduling. */
2118 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2119 return;
2120 dasd_get_device(device);
2121 tasklet_hi_schedule(&device->tasklet);
2122 }
2123 EXPORT_SYMBOL(dasd_schedule_device_bh);
2124
2125 void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2126 {
2127 device->stopped |= bits;
2128 }
2129 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2130
2131 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2132 {
2133 device->stopped &= ~bits;
2134 if (!device->stopped)
2135 wake_up(&generic_waitq);
2136 }
2137 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2138
2139 /*
2140 * Queue a request to the head of the device ccw_queue.
2141 * Start the I/O if possible.
2142 */
2143 void dasd_add_request_head(struct dasd_ccw_req *cqr)
2144 {
2145 struct dasd_device *device;
2146 unsigned long flags;
2147
2148 device = cqr->startdev;
2149 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2150 cqr->status = DASD_CQR_QUEUED;
2151 list_add(&cqr->devlist, &device->ccw_queue);
2152 /* let the bh start the request to keep them in order */
2153 dasd_schedule_device_bh(device);
2154 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2155 }
2156 EXPORT_SYMBOL(dasd_add_request_head);
2157
2158 /*
2159 * Queue a request to the tail of the device ccw_queue.
2160 * Start the I/O if possible.
2161 */
2162 void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2163 {
2164 struct dasd_device *device;
2165 unsigned long flags;
2166
2167 device = cqr->startdev;
2168 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2169 cqr->status = DASD_CQR_QUEUED;
2170 list_add_tail(&cqr->devlist, &device->ccw_queue);
2171 /* let the bh start the request to keep them in order */
2172 dasd_schedule_device_bh(device);
2173 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2174 }
2175 EXPORT_SYMBOL(dasd_add_request_tail);
2176
2177 /*
2178 * Wakeup helper for the 'sleep_on' functions.
2179 */
2180 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2181 {
2182 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2183 cqr->callback_data = DASD_SLEEPON_END_TAG;
2184 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2185 wake_up(&generic_waitq);
2186 }
2187 EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2188
2189 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2190 {
2191 struct dasd_device *device;
2192 int rc;
2193
2194 device = cqr->startdev;
2195 spin_lock_irq(get_ccwdev_lock(device->cdev));
2196 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2197 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2198 return rc;
2199 }
2200
2201 /*
2202 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise.
2203 */
2204 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2205 {
2206 struct dasd_device *device;
2207 dasd_erp_fn_t erp_fn;
2208
2209 if (cqr->status == DASD_CQR_FILLED)
2210 return 0;
2211 device = cqr->startdev;
2212 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2213 if (cqr->status == DASD_CQR_TERMINATED) {
2214 device->discipline->handle_terminated_request(cqr);
2215 return 1;
2216 }
2217 if (cqr->status == DASD_CQR_NEED_ERP) {
2218 erp_fn = device->discipline->erp_action(cqr);
2219 erp_fn(cqr);
2220 return 1;
2221 }
2222 if (cqr->status == DASD_CQR_FAILED)
2223 dasd_log_sense(cqr, &cqr->irb);
2224 if (cqr->refers) {
2225 __dasd_process_erp(device, cqr);
2226 return 1;
2227 }
2228 }
2229 return 0;
2230 }
2231
2232 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2233 {
2234 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2235 if (cqr->refers) /* erp is not done yet */
2236 return 1;
2237 return ((cqr->status != DASD_CQR_DONE) &&
2238 (cqr->status != DASD_CQR_FAILED));
2239 } else
2240 return (cqr->status == DASD_CQR_FILLED);
2241 }
2242
2243 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2244 {
2245 struct dasd_device *device;
2246 int rc;
2247 struct list_head ccw_queue;
2248 struct dasd_ccw_req *cqr;
2249
2250 INIT_LIST_HEAD(&ccw_queue);
2251 maincqr->status = DASD_CQR_FILLED;
2252 device = maincqr->startdev;
2253 list_add(&maincqr->blocklist, &ccw_queue);
2254 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2255 cqr = list_first_entry(&ccw_queue,
2256 struct dasd_ccw_req, blocklist)) {
2257
2258 if (__dasd_sleep_on_erp(cqr))
2259 continue;
2260 if (cqr->status != DASD_CQR_FILLED) /* could be failed */
2261 continue;
2262 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2263 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2264 cqr->status = DASD_CQR_FAILED;
2265 cqr->intrc = -EPERM;
2266 continue;
2267 }
2268 /* Non-temporary stop condition will trigger fail fast */
2269 if (device->stopped & ~DASD_STOPPED_PENDING &&
2270 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2271 (!dasd_eer_enabled(device))) {
2272 cqr->status = DASD_CQR_FAILED;
2273 cqr->intrc = -ENOLINK;
2274 continue;
2275 }
2276 /*
2277 * Don't try to start requests if device is stopped
2278 * except path verification requests
2279 */
2280 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2281 if (interruptible) {
2282 rc = wait_event_interruptible(
2283 generic_waitq, !(device->stopped));
2284 if (rc == -ERESTARTSYS) {
2285 cqr->status = DASD_CQR_FAILED;
2286 maincqr->intrc = rc;
2287 continue;
2288 }
2289 } else
2290 wait_event(generic_waitq, !(device->stopped));
2291 }
2292 if (!cqr->callback)
2293 cqr->callback = dasd_wakeup_cb;
2294
2295 cqr->callback_data = DASD_SLEEPON_START_TAG;
2296 dasd_add_request_tail(cqr);
2297 if (interruptible) {
2298 rc = wait_event_interruptible(
2299 generic_waitq, _wait_for_wakeup(cqr));
2300 if (rc == -ERESTARTSYS) {
2301 dasd_cancel_req(cqr);
2302 /* wait (non-interruptible) for final status */
2303 wait_event(generic_waitq,
2304 _wait_for_wakeup(cqr));
2305 cqr->status = DASD_CQR_FAILED;
2306 maincqr->intrc = rc;
2307 continue;
2308 }
2309 } else
2310 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2311 }
2312
2313 maincqr->endclk = get_tod_clock();
2314 if ((maincqr->status != DASD_CQR_DONE) &&
2315 (maincqr->intrc != -ERESTARTSYS))
2316 dasd_log_sense(maincqr, &maincqr->irb);
2317 if (maincqr->status == DASD_CQR_DONE)
2318 rc = 0;
2319 else if (maincqr->intrc)
2320 rc = maincqr->intrc;
2321 else
2322 rc = -EIO;
2323 return rc;
2324 }
2325
2326 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2327 {
2328 struct dasd_ccw_req *cqr;
2329
2330 list_for_each_entry(cqr, ccw_queue, blocklist) {
2331 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2332 return 0;
2333 }
2334
2335 return 1;
2336 }
2337
2338 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2339 {
2340 struct dasd_device *device;
2341 struct dasd_ccw_req *cqr, *n;
2342 u8 *sense = NULL;
2343 int rc;
2344
2345 retry:
2346 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2347 device = cqr->startdev;
2348 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/
2349 continue;
2350
2351 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2352 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2353 cqr->status = DASD_CQR_FAILED;
2354 cqr->intrc = -EPERM;
2355 continue;
2356 }
2357 /*Non-temporary stop condition will trigger fail fast*/
2358 if (device->stopped & ~DASD_STOPPED_PENDING &&
2359 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2360 !dasd_eer_enabled(device)) {
2361 cqr->status = DASD_CQR_FAILED;
2362 cqr->intrc = -EAGAIN;
2363 continue;
2364 }
2365
2366 /*Don't try to start requests if device is stopped*/
2367 if (interruptible) {
2368 rc = wait_event_interruptible(
2369 generic_waitq, !device->stopped);
2370 if (rc == -ERESTARTSYS) {
2371 cqr->status = DASD_CQR_FAILED;
2372 cqr->intrc = rc;
2373 continue;
2374 }
2375 } else
2376 wait_event(generic_waitq, !(device->stopped));
2377
2378 if (!cqr->callback)
2379 cqr->callback = dasd_wakeup_cb;
2380 cqr->callback_data = DASD_SLEEPON_START_TAG;
2381 dasd_add_request_tail(cqr);
2382 }
2383
2384 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2385
2386 rc = 0;
2387 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2388 /*
2389 * In some cases the 'File Protected' or 'Incorrect Length'
2390 * error might be expected and error recovery would be
2391 * unnecessary in these cases. Check if the according suppress
2392 * bit is set.
2393 */
2394 sense = dasd_get_sense(&cqr->irb);
2395 if (sense && sense[1] & SNS1_FILE_PROTECTED &&
2396 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
2397 continue;
2398 if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
2399 test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
2400 continue;
2401
2402 /*
2403 * for alias devices simplify error recovery and
2404 * return to upper layer
2405 * do not skip ERP requests
2406 */
2407 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2408 (cqr->status == DASD_CQR_TERMINATED ||
2409 cqr->status == DASD_CQR_NEED_ERP))
2410 return -EAGAIN;
2411
2412 /* normal recovery for basedev IO */
2413 if (__dasd_sleep_on_erp(cqr))
2414 /* handle erp first */
2415 goto retry;
2416 }
2417
2418 return 0;
2419 }
2420
2421 /*
2422 * Queue a request to the tail of the device ccw_queue and wait for
2423 * it's completion.
2424 */
2425 int dasd_sleep_on(struct dasd_ccw_req *cqr)
2426 {
2427 return _dasd_sleep_on(cqr, 0);
2428 }
2429 EXPORT_SYMBOL(dasd_sleep_on);
2430
2431 /*
2432 * Start requests from a ccw_queue and wait for their completion.
2433 */
2434 int dasd_sleep_on_queue(struct list_head *ccw_queue)
2435 {
2436 return _dasd_sleep_on_queue(ccw_queue, 0);
2437 }
2438 EXPORT_SYMBOL(dasd_sleep_on_queue);
2439
2440 /*
2441 * Queue a request to the tail of the device ccw_queue and wait
2442 * interruptible for it's completion.
2443 */
2444 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2445 {
2446 return _dasd_sleep_on(cqr, 1);
2447 }
2448 EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2449
2450 /*
2451 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock
2452 * for eckd devices) the currently running request has to be terminated
2453 * and be put back to status queued, before the special request is added
2454 * to the head of the queue. Then the special request is waited on normally.
2455 */
2456 static inline int _dasd_term_running_cqr(struct dasd_device *device)
2457 {
2458 struct dasd_ccw_req *cqr;
2459 int rc;
2460
2461 if (list_empty(&device->ccw_queue))
2462 return 0;
2463 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2464 rc = device->discipline->term_IO(cqr);
2465 if (!rc)
2466 /*
2467 * CQR terminated because a more important request is pending.
2468 * Undo decreasing of retry counter because this is
2469 * not an error case.
2470 */
2471 cqr->retries++;
2472 return rc;
2473 }
2474
2475 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2476 {
2477 struct dasd_device *device;
2478 int rc;
2479
2480 device = cqr->startdev;
2481 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2482 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2483 cqr->status = DASD_CQR_FAILED;
2484 cqr->intrc = -EPERM;
2485 return -EIO;
2486 }
2487 spin_lock_irq(get_ccwdev_lock(device->cdev));
2488 rc = _dasd_term_running_cqr(device);
2489 if (rc) {
2490 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2491 return rc;
2492 }
2493 cqr->callback = dasd_wakeup_cb;
2494 cqr->callback_data = DASD_SLEEPON_START_TAG;
2495 cqr->status = DASD_CQR_QUEUED;
2496 /*
2497 * add new request as second
2498 * first the terminated cqr needs to be finished
2499 */
2500 list_add(&cqr->devlist, device->ccw_queue.next);
2501
2502 /* let the bh start the request to keep them in order */
2503 dasd_schedule_device_bh(device);
2504
2505 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2506
2507 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2508
2509 if (cqr->status == DASD_CQR_DONE)
2510 rc = 0;
2511 else if (cqr->intrc)
2512 rc = cqr->intrc;
2513 else
2514 rc = -EIO;
2515
2516 /* kick tasklets */
2517 dasd_schedule_device_bh(device);
2518 if (device->block)
2519 dasd_schedule_block_bh(device->block);
2520
2521 return rc;
2522 }
2523 EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2524
2525 /*
2526 * Cancels a request that was started with dasd_sleep_on_req.
2527 * This is useful to timeout requests. The request will be
2528 * terminated if it is currently in i/o.
2529 * Returns 0 if request termination was successful
2530 * negative error code if termination failed
2531 * Cancellation of a request is an asynchronous operation! The calling
2532 * function has to wait until the request is properly returned via callback.
2533 */
2534 int dasd_cancel_req(struct dasd_ccw_req *cqr)
2535 {
2536 struct dasd_device *device = cqr->startdev;
2537 unsigned long flags;
2538 int rc;
2539
2540 rc = 0;
2541 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2542 switch (cqr->status) {
2543 case DASD_CQR_QUEUED:
2544 /* request was not started - just set to cleared */
2545 cqr->status = DASD_CQR_CLEARED;
2546 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2547 cqr->callback_data = DASD_SLEEPON_END_TAG;
2548 break;
2549 case DASD_CQR_IN_IO:
2550 /* request in IO - terminate IO and release again */
2551 rc = device->discipline->term_IO(cqr);
2552 if (rc) {
2553 dev_err(&device->cdev->dev,
2554 "Cancelling request %p failed with rc=%d\n",
2555 cqr, rc);
2556 } else {
2557 cqr->stopclk = get_tod_clock();
2558 }
2559 break;
2560 default: /* already finished or clear pending - do nothing */
2561 break;
2562 }
2563 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2564 dasd_schedule_device_bh(device);
2565 return rc;
2566 }
2567 EXPORT_SYMBOL(dasd_cancel_req);
2568
2569 /*
2570 * SECTION: Operations of the dasd_block layer.
2571 */
2572
2573 /*
2574 * Timeout function for dasd_block. This is used when the block layer
2575 * is waiting for something that may not come reliably, (e.g. a state
2576 * change interrupt)
2577 */
2578 static void dasd_block_timeout(unsigned long ptr)
2579 {
2580 unsigned long flags;
2581 struct dasd_block *block;
2582
2583 block = (struct dasd_block *) ptr;
2584 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2585 /* re-activate request queue */
2586 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2587 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2588 dasd_schedule_block_bh(block);
2589 }
2590
2591 /*
2592 * Setup timeout for a dasd_block in jiffies.
2593 */
2594 void dasd_block_set_timer(struct dasd_block *block, int expires)
2595 {
2596 if (expires == 0)
2597 del_timer(&block->timer);
2598 else
2599 mod_timer(&block->timer, jiffies + expires);
2600 }
2601 EXPORT_SYMBOL(dasd_block_set_timer);
2602
2603 /*
2604 * Clear timeout for a dasd_block.
2605 */
2606 void dasd_block_clear_timer(struct dasd_block *block)
2607 {
2608 del_timer(&block->timer);
2609 }
2610 EXPORT_SYMBOL(dasd_block_clear_timer);
2611
2612 /*
2613 * Process finished error recovery ccw.
2614 */
2615 static void __dasd_process_erp(struct dasd_device *device,
2616 struct dasd_ccw_req *cqr)
2617 {
2618 dasd_erp_fn_t erp_fn;
2619
2620 if (cqr->status == DASD_CQR_DONE)
2621 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2622 else
2623 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2624 erp_fn = device->discipline->erp_postaction(cqr);
2625 erp_fn(cqr);
2626 }
2627
2628 /*
2629 * Fetch requests from the block device queue.
2630 */
2631 static void __dasd_process_request_queue(struct dasd_block *block)
2632 {
2633 struct request_queue *queue;
2634 struct request *req;
2635 struct dasd_ccw_req *cqr;
2636 struct dasd_device *basedev;
2637 unsigned long flags;
2638 queue = block->request_queue;
2639 basedev = block->base;
2640 /* No queue ? Then there is nothing to do. */
2641 if (queue == NULL)
2642 return;
2643
2644 /*
2645 * We requeue request from the block device queue to the ccw
2646 * queue only in two states. In state DASD_STATE_READY the
2647 * partition detection is done and we need to requeue requests
2648 * for that. State DASD_STATE_ONLINE is normal block device
2649 * operation.
2650 */
2651 if (basedev->state < DASD_STATE_READY) {
2652 while ((req = blk_fetch_request(block->request_queue)))
2653 __blk_end_request_all(req, -EIO);
2654 return;
2655 }
2656
2657 /*
2658 * if device is stopped do not fetch new requests
2659 * except failfast is active which will let requests fail
2660 * immediately in __dasd_block_start_head()
2661 */
2662 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST))
2663 return;
2664
2665 /* Now we try to fetch requests from the request queue */
2666 while ((req = blk_peek_request(queue))) {
2667 if (basedev->features & DASD_FEATURE_READONLY &&
2668 rq_data_dir(req) == WRITE) {
2669 DBF_DEV_EVENT(DBF_ERR, basedev,
2670 "Rejecting write request %p",
2671 req);
2672 blk_start_request(req);
2673 __blk_end_request_all(req, -EIO);
2674 continue;
2675 }
2676 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2677 (basedev->features & DASD_FEATURE_FAILFAST ||
2678 blk_noretry_request(req))) {
2679 DBF_DEV_EVENT(DBF_ERR, basedev,
2680 "Rejecting failfast request %p",
2681 req);
2682 blk_start_request(req);
2683 __blk_end_request_all(req, -ETIMEDOUT);
2684 continue;
2685 }
2686 cqr = basedev->discipline->build_cp(basedev, block, req);
2687 if (IS_ERR(cqr)) {
2688 if (PTR_ERR(cqr) == -EBUSY)
2689 break; /* normal end condition */
2690 if (PTR_ERR(cqr) == -ENOMEM)
2691 break; /* terminate request queue loop */
2692 if (PTR_ERR(cqr) == -EAGAIN) {
2693 /*
2694 * The current request cannot be build right
2695 * now, we have to try later. If this request
2696 * is the head-of-queue we stop the device
2697 * for 1/2 second.
2698 */
2699 if (!list_empty(&block->ccw_queue))
2700 break;
2701 spin_lock_irqsave(
2702 get_ccwdev_lock(basedev->cdev), flags);
2703 dasd_device_set_stop_bits(basedev,
2704 DASD_STOPPED_PENDING);
2705 spin_unlock_irqrestore(
2706 get_ccwdev_lock(basedev->cdev), flags);
2707 dasd_block_set_timer(block, HZ/2);
2708 break;
2709 }
2710 DBF_DEV_EVENT(DBF_ERR, basedev,
2711 "CCW creation failed (rc=%ld) "
2712 "on request %p",
2713 PTR_ERR(cqr), req);
2714 blk_start_request(req);
2715 __blk_end_request_all(req, -EIO);
2716 continue;
2717 }
2718 /*
2719 * Note: callback is set to dasd_return_cqr_cb in
2720 * __dasd_block_start_head to cover erp requests as well
2721 */
2722 cqr->callback_data = (void *) req;
2723 cqr->status = DASD_CQR_FILLED;
2724 req->completion_data = cqr;
2725 blk_start_request(req);
2726 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2727 INIT_LIST_HEAD(&cqr->devlist);
2728 dasd_profile_start(block, cqr, req);
2729 }
2730 }
2731
2732 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2733 {
2734 struct request *req;
2735 int status;
2736 int error = 0;
2737
2738 req = (struct request *) cqr->callback_data;
2739 dasd_profile_end(cqr->block, cqr, req);
2740 status = cqr->block->base->discipline->free_cp(cqr, req);
2741 if (status < 0)
2742 error = status;
2743 else if (status == 0) {
2744 if (cqr->intrc == -EPERM)
2745 error = -EBADE;
2746 else if (cqr->intrc == -ENOLINK ||
2747 cqr->intrc == -ETIMEDOUT)
2748 error = cqr->intrc;
2749 else
2750 error = -EIO;
2751 }
2752 __blk_end_request_all(req, error);
2753 }
2754
2755 /*
2756 * Process ccw request queue.
2757 */
2758 static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2759 struct list_head *final_queue)
2760 {
2761 struct list_head *l, *n;
2762 struct dasd_ccw_req *cqr;
2763 dasd_erp_fn_t erp_fn;
2764 unsigned long flags;
2765 struct dasd_device *base = block->base;
2766
2767 restart:
2768 /* Process request with final status. */
2769 list_for_each_safe(l, n, &block->ccw_queue) {
2770 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2771 if (cqr->status != DASD_CQR_DONE &&
2772 cqr->status != DASD_CQR_FAILED &&
2773 cqr->status != DASD_CQR_NEED_ERP &&
2774 cqr->status != DASD_CQR_TERMINATED)
2775 continue;
2776
2777 if (cqr->status == DASD_CQR_TERMINATED) {
2778 base->discipline->handle_terminated_request(cqr);
2779 goto restart;
2780 }
2781
2782 /* Process requests that may be recovered */
2783 if (cqr->status == DASD_CQR_NEED_ERP) {
2784 erp_fn = base->discipline->erp_action(cqr);
2785 if (IS_ERR(erp_fn(cqr)))
2786 continue;
2787 goto restart;
2788 }
2789
2790 /* log sense for fatal error */
2791 if (cqr->status == DASD_CQR_FAILED) {
2792 dasd_log_sense(cqr, &cqr->irb);
2793 }
2794
2795 /* First of all call extended error reporting. */
2796 if (dasd_eer_enabled(base) &&
2797 cqr->status == DASD_CQR_FAILED) {
2798 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2799
2800 /* restart request */
2801 cqr->status = DASD_CQR_FILLED;
2802 cqr->retries = 255;
2803 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2804 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2805 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2806 flags);
2807 goto restart;
2808 }
2809
2810 /* Process finished ERP request. */
2811 if (cqr->refers) {
2812 __dasd_process_erp(base, cqr);
2813 goto restart;
2814 }
2815
2816 /* Rechain finished requests to final queue */
2817 cqr->endclk = get_tod_clock();
2818 list_move_tail(&cqr->blocklist, final_queue);
2819 }
2820 }
2821
2822 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2823 {
2824 dasd_schedule_block_bh(cqr->block);
2825 }
2826
2827 static void __dasd_block_start_head(struct dasd_block *block)
2828 {
2829 struct dasd_ccw_req *cqr;
2830
2831 if (list_empty(&block->ccw_queue))
2832 return;
2833 /* We allways begin with the first requests on the queue, as some
2834 * of previously started requests have to be enqueued on a
2835 * dasd_device again for error recovery.
2836 */
2837 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2838 if (cqr->status != DASD_CQR_FILLED)
2839 continue;
2840 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2841 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2842 cqr->status = DASD_CQR_FAILED;
2843 cqr->intrc = -EPERM;
2844 dasd_schedule_block_bh(block);
2845 continue;
2846 }
2847 /* Non-temporary stop condition will trigger fail fast */
2848 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2849 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2850 (!dasd_eer_enabled(block->base))) {
2851 cqr->status = DASD_CQR_FAILED;
2852 cqr->intrc = -ENOLINK;
2853 dasd_schedule_block_bh(block);
2854 continue;
2855 }
2856 /* Don't try to start requests if device is stopped */
2857 if (block->base->stopped)
2858 return;
2859
2860 /* just a fail safe check, should not happen */
2861 if (!cqr->startdev)
2862 cqr->startdev = block->base;
2863
2864 /* make sure that the requests we submit find their way back */
2865 cqr->callback = dasd_return_cqr_cb;
2866
2867 dasd_add_request_tail(cqr);
2868 }
2869 }
2870
2871 /*
2872 * Central dasd_block layer routine. Takes requests from the generic
2873 * block layer request queue, creates ccw requests, enqueues them on
2874 * a dasd_device and processes ccw requests that have been returned.
2875 */
2876 static void dasd_block_tasklet(struct dasd_block *block)
2877 {
2878 struct list_head final_queue;
2879 struct list_head *l, *n;
2880 struct dasd_ccw_req *cqr;
2881
2882 atomic_set(&block->tasklet_scheduled, 0);
2883 INIT_LIST_HEAD(&final_queue);
2884 spin_lock(&block->queue_lock);
2885 /* Finish off requests on ccw queue */
2886 __dasd_process_block_ccw_queue(block, &final_queue);
2887 spin_unlock(&block->queue_lock);
2888 /* Now call the callback function of requests with final status */
2889 spin_lock_irq(&block->request_queue_lock);
2890 list_for_each_safe(l, n, &final_queue) {
2891 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2892 list_del_init(&cqr->blocklist);
2893 __dasd_cleanup_cqr(cqr);
2894 }
2895 spin_lock(&block->queue_lock);
2896 /* Get new request from the block device request queue */
2897 __dasd_process_request_queue(block);
2898 /* Now check if the head of the ccw queue needs to be started. */
2899 __dasd_block_start_head(block);
2900 spin_unlock(&block->queue_lock);
2901 spin_unlock_irq(&block->request_queue_lock);
2902 if (waitqueue_active(&shutdown_waitq))
2903 wake_up(&shutdown_waitq);
2904 dasd_put_device(block->base);
2905 }
2906
2907 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2908 {
2909 wake_up(&dasd_flush_wq);
2910 }
2911
2912 /*
2913 * Requeue a request back to the block request queue
2914 * only works for block requests
2915 */
2916 static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2917 {
2918 struct dasd_block *block = cqr->block;
2919 struct request *req;
2920 unsigned long flags;
2921
2922 if (!block)
2923 return -EINVAL;
2924 spin_lock_irqsave(&block->queue_lock, flags);
2925 req = (struct request *) cqr->callback_data;
2926 blk_requeue_request(block->request_queue, req);
2927 spin_unlock_irqrestore(&block->queue_lock, flags);
2928
2929 return 0;
2930 }
2931
2932 /*
2933 * Go through all request on the dasd_block request queue, cancel them
2934 * on the respective dasd_device, and return them to the generic
2935 * block layer.
2936 */
2937 static int dasd_flush_block_queue(struct dasd_block *block)
2938 {
2939 struct dasd_ccw_req *cqr, *n;
2940 int rc, i;
2941 struct list_head flush_queue;
2942
2943 INIT_LIST_HEAD(&flush_queue);
2944 spin_lock_bh(&block->queue_lock);
2945 rc = 0;
2946 restart:
2947 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2948 /* if this request currently owned by a dasd_device cancel it */
2949 if (cqr->status >= DASD_CQR_QUEUED)
2950 rc = dasd_cancel_req(cqr);
2951 if (rc < 0)
2952 break;
2953 /* Rechain request (including erp chain) so it won't be
2954 * touched by the dasd_block_tasklet anymore.
2955 * Replace the callback so we notice when the request
2956 * is returned from the dasd_device layer.
2957 */
2958 cqr->callback = _dasd_wake_block_flush_cb;
2959 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2960 list_move_tail(&cqr->blocklist, &flush_queue);
2961 if (i > 1)
2962 /* moved more than one request - need to restart */
2963 goto restart;
2964 }
2965 spin_unlock_bh(&block->queue_lock);
2966 /* Now call the callback function of flushed requests */
2967 restart_cb:
2968 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2969 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2970 /* Process finished ERP request. */
2971 if (cqr->refers) {
2972 spin_lock_bh(&block->queue_lock);
2973 __dasd_process_erp(block->base, cqr);
2974 spin_unlock_bh(&block->queue_lock);
2975 /* restart list_for_xx loop since dasd_process_erp
2976 * might remove multiple elements */
2977 goto restart_cb;
2978 }
2979 /* call the callback function */
2980 spin_lock_irq(&block->request_queue_lock);
2981 cqr->endclk = get_tod_clock();
2982 list_del_init(&cqr->blocklist);
2983 __dasd_cleanup_cqr(cqr);
2984 spin_unlock_irq(&block->request_queue_lock);
2985 }
2986 return rc;
2987 }
2988
2989 /*
2990 * Schedules a call to dasd_tasklet over the device tasklet.
2991 */
2992 void dasd_schedule_block_bh(struct dasd_block *block)
2993 {
2994 /* Protect against rescheduling. */
2995 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2996 return;
2997 /* life cycle of block is bound to it's base device */
2998 dasd_get_device(block->base);
2999 tasklet_hi_schedule(&block->tasklet);
3000 }
3001 EXPORT_SYMBOL(dasd_schedule_block_bh);
3002
3003
3004 /*
3005 * SECTION: external block device operations
3006 * (request queue handling, open, release, etc.)
3007 */
3008
3009 /*
3010 * Dasd request queue function. Called from ll_rw_blk.c
3011 */
3012 static void do_dasd_request(struct request_queue *queue)
3013 {
3014 struct dasd_block *block;
3015
3016 block = queue->queuedata;
3017 spin_lock(&block->queue_lock);
3018 /* Get new request from the block device request queue */
3019 __dasd_process_request_queue(block);
3020 /* Now check if the head of the ccw queue needs to be started. */
3021 __dasd_block_start_head(block);
3022 spin_unlock(&block->queue_lock);
3023 }
3024
3025 /*
3026 * Block timeout callback, called from the block layer
3027 *
3028 * request_queue lock is held on entry.
3029 *
3030 * Return values:
3031 * BLK_EH_RESET_TIMER if the request should be left running
3032 * BLK_EH_NOT_HANDLED if the request is handled or terminated
3033 * by the driver.
3034 */
3035 enum blk_eh_timer_return dasd_times_out(struct request *req)
3036 {
3037 struct dasd_ccw_req *cqr = req->completion_data;
3038 struct dasd_block *block = req->q->queuedata;
3039 struct dasd_device *device;
3040 int rc = 0;
3041
3042 if (!cqr)
3043 return BLK_EH_NOT_HANDLED;
3044
3045 device = cqr->startdev ? cqr->startdev : block->base;
3046 if (!device->blk_timeout)
3047 return BLK_EH_RESET_TIMER;
3048 DBF_DEV_EVENT(DBF_WARNING, device,
3049 " dasd_times_out cqr %p status %x",
3050 cqr, cqr->status);
3051
3052 spin_lock(&block->queue_lock);
3053 spin_lock(get_ccwdev_lock(device->cdev));
3054 cqr->retries = -1;
3055 cqr->intrc = -ETIMEDOUT;
3056 if (cqr->status >= DASD_CQR_QUEUED) {
3057 spin_unlock(get_ccwdev_lock(device->cdev));
3058 rc = dasd_cancel_req(cqr);
3059 } else if (cqr->status == DASD_CQR_FILLED ||
3060 cqr->status == DASD_CQR_NEED_ERP) {
3061 cqr->status = DASD_CQR_TERMINATED;
3062 spin_unlock(get_ccwdev_lock(device->cdev));
3063 } else if (cqr->status == DASD_CQR_IN_ERP) {
3064 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
3065
3066 list_for_each_entry_safe(searchcqr, nextcqr,
3067 &block->ccw_queue, blocklist) {
3068 tmpcqr = searchcqr;
3069 while (tmpcqr->refers)
3070 tmpcqr = tmpcqr->refers;
3071 if (tmpcqr != cqr)
3072 continue;
3073 /* searchcqr is an ERP request for cqr */
3074 searchcqr->retries = -1;
3075 searchcqr->intrc = -ETIMEDOUT;
3076 if (searchcqr->status >= DASD_CQR_QUEUED) {
3077 spin_unlock(get_ccwdev_lock(device->cdev));
3078 rc = dasd_cancel_req(searchcqr);
3079 spin_lock(get_ccwdev_lock(device->cdev));
3080 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
3081 (searchcqr->status == DASD_CQR_NEED_ERP)) {
3082 searchcqr->status = DASD_CQR_TERMINATED;
3083 rc = 0;
3084 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
3085 /*
3086 * Shouldn't happen; most recent ERP
3087 * request is at the front of queue
3088 */
3089 continue;
3090 }
3091 break;
3092 }
3093 spin_unlock(get_ccwdev_lock(device->cdev));
3094 }
3095 dasd_schedule_block_bh(block);
3096 spin_unlock(&block->queue_lock);
3097
3098 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
3099 }
3100
3101 /*
3102 * Allocate and initialize request queue and default I/O scheduler.
3103 */
3104 static int dasd_alloc_queue(struct dasd_block *block)
3105 {
3106 block->request_queue = blk_init_queue(do_dasd_request,
3107 &block->request_queue_lock);
3108 if (block->request_queue == NULL)
3109 return -ENOMEM;
3110
3111 block->request_queue->queuedata = block;
3112
3113 return 0;
3114 }
3115
3116 /*
3117 * Allocate and initialize request queue.
3118 */
3119 static void dasd_setup_queue(struct dasd_block *block)
3120 {
3121 int max;
3122
3123 if (block->base->features & DASD_FEATURE_USERAW) {
3124 /*
3125 * the max_blocks value for raw_track access is 256
3126 * it is higher than the native ECKD value because we
3127 * only need one ccw per track
3128 * so the max_hw_sectors are
3129 * 2048 x 512B = 1024kB = 16 tracks
3130 */
3131 max = 2048;
3132 } else {
3133 max = block->base->discipline->max_blocks << block->s2b_shift;
3134 }
3135 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue);
3136 block->request_queue->limits.max_dev_sectors = max;
3137 blk_queue_logical_block_size(block->request_queue,
3138 block->bp_block);
3139 blk_queue_max_hw_sectors(block->request_queue, max);
3140 blk_queue_max_segments(block->request_queue, -1L);
3141 /* with page sized segments we can translate each segement into
3142 * one idaw/tidaw
3143 */
3144 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3145 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
3146 }
3147
3148 /*
3149 * Deactivate and free request queue.
3150 */
3151 static void dasd_free_queue(struct dasd_block *block)
3152 {
3153 if (block->request_queue) {
3154 blk_cleanup_queue(block->request_queue);
3155 block->request_queue = NULL;
3156 }
3157 }
3158
3159 /*
3160 * Flush request on the request queue.
3161 */
3162 static void dasd_flush_request_queue(struct dasd_block *block)
3163 {
3164 struct request *req;
3165
3166 if (!block->request_queue)
3167 return;
3168
3169 spin_lock_irq(&block->request_queue_lock);
3170 while ((req = blk_fetch_request(block->request_queue)))
3171 __blk_end_request_all(req, -EIO);
3172 spin_unlock_irq(&block->request_queue_lock);
3173 }
3174
3175 static int dasd_open(struct block_device *bdev, fmode_t mode)
3176 {
3177 struct dasd_device *base;
3178 int rc;
3179
3180 base = dasd_device_from_gendisk(bdev->bd_disk);
3181 if (!base)
3182 return -ENODEV;
3183
3184 atomic_inc(&base->block->open_count);
3185 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3186 rc = -ENODEV;
3187 goto unlock;
3188 }
3189
3190 if (!try_module_get(base->discipline->owner)) {
3191 rc = -EINVAL;
3192 goto unlock;
3193 }
3194
3195 if (dasd_probeonly) {
3196 dev_info(&base->cdev->dev,
3197 "Accessing the DASD failed because it is in "
3198 "probeonly mode\n");
3199 rc = -EPERM;
3200 goto out;
3201 }
3202
3203 if (base->state <= DASD_STATE_BASIC) {
3204 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3205 " Cannot open unrecognized device");
3206 rc = -ENODEV;
3207 goto out;
3208 }
3209
3210 if ((mode & FMODE_WRITE) &&
3211 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3212 (base->features & DASD_FEATURE_READONLY))) {
3213 rc = -EROFS;
3214 goto out;
3215 }
3216
3217 dasd_put_device(base);
3218 return 0;
3219
3220 out:
3221 module_put(base->discipline->owner);
3222 unlock:
3223 atomic_dec(&base->block->open_count);
3224 dasd_put_device(base);
3225 return rc;
3226 }
3227
3228 static void dasd_release(struct gendisk *disk, fmode_t mode)
3229 {
3230 struct dasd_device *base = dasd_device_from_gendisk(disk);
3231 if (base) {
3232 atomic_dec(&base->block->open_count);
3233 module_put(base->discipline->owner);
3234 dasd_put_device(base);
3235 }
3236 }
3237
3238 /*
3239 * Return disk geometry.
3240 */
3241 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3242 {
3243 struct dasd_device *base;
3244
3245 base = dasd_device_from_gendisk(bdev->bd_disk);
3246 if (!base)
3247 return -ENODEV;
3248
3249 if (!base->discipline ||
3250 !base->discipline->fill_geometry) {
3251 dasd_put_device(base);
3252 return -EINVAL;
3253 }
3254 base->discipline->fill_geometry(base->block, geo);
3255 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3256 dasd_put_device(base);
3257 return 0;
3258 }
3259
3260 const struct block_device_operations
3261 dasd_device_operations = {
3262 .owner = THIS_MODULE,
3263 .open = dasd_open,
3264 .release = dasd_release,
3265 .ioctl = dasd_ioctl,
3266 .compat_ioctl = dasd_ioctl,
3267 .getgeo = dasd_getgeo,
3268 };
3269
3270 /*******************************************************************************
3271 * end of block device operations
3272 */
3273
3274 static void
3275 dasd_exit(void)
3276 {
3277 #ifdef CONFIG_PROC_FS
3278 dasd_proc_exit();
3279 #endif
3280 dasd_eer_exit();
3281 if (dasd_page_cache != NULL) {
3282 kmem_cache_destroy(dasd_page_cache);
3283 dasd_page_cache = NULL;
3284 }
3285 dasd_gendisk_exit();
3286 dasd_devmap_exit();
3287 if (dasd_debug_area != NULL) {
3288 debug_unregister(dasd_debug_area);
3289 dasd_debug_area = NULL;
3290 }
3291 dasd_statistics_removeroot();
3292 }
3293
3294 /*
3295 * SECTION: common functions for ccw_driver use
3296 */
3297
3298 /*
3299 * Is the device read-only?
3300 * Note that this function does not report the setting of the
3301 * readonly device attribute, but how it is configured in z/VM.
3302 */
3303 int dasd_device_is_ro(struct dasd_device *device)
3304 {
3305 struct ccw_dev_id dev_id;
3306 struct diag210 diag_data;
3307 int rc;
3308
3309 if (!MACHINE_IS_VM)
3310 return 0;
3311 ccw_device_get_id(device->cdev, &dev_id);
3312 memset(&diag_data, 0, sizeof(diag_data));
3313 diag_data.vrdcdvno = dev_id.devno;
3314 diag_data.vrdclen = sizeof(diag_data);
3315 rc = diag210(&diag_data);
3316 if (rc == 0 || rc == 2) {
3317 return diag_data.vrdcvfla & 0x80;
3318 } else {
3319 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3320 dev_id.devno, rc);
3321 return 0;
3322 }
3323 }
3324 EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3325
3326 static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3327 {
3328 struct ccw_device *cdev = data;
3329 int ret;
3330
3331 ret = ccw_device_set_online(cdev);
3332 if (ret)
3333 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3334 dev_name(&cdev->dev), ret);
3335 }
3336
3337 /*
3338 * Initial attempt at a probe function. this can be simplified once
3339 * the other detection code is gone.
3340 */
3341 int dasd_generic_probe(struct ccw_device *cdev,
3342 struct dasd_discipline *discipline)
3343 {
3344 int ret;
3345
3346 ret = dasd_add_sysfs_files(cdev);
3347 if (ret) {
3348 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3349 "dasd_generic_probe: could not add "
3350 "sysfs entries");
3351 return ret;
3352 }
3353 cdev->handler = &dasd_int_handler;
3354
3355 /*
3356 * Automatically online either all dasd devices (dasd_autodetect)
3357 * or all devices specified with dasd= parameters during
3358 * initial probe.
3359 */
3360 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3361 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3362 async_schedule(dasd_generic_auto_online, cdev);
3363 return 0;
3364 }
3365 EXPORT_SYMBOL_GPL(dasd_generic_probe);
3366
3367 /*
3368 * This will one day be called from a global not_oper handler.
3369 * It is also used by driver_unregister during module unload.
3370 */
3371 void dasd_generic_remove(struct ccw_device *cdev)
3372 {
3373 struct dasd_device *device;
3374 struct dasd_block *block;
3375
3376 cdev->handler = NULL;
3377
3378 device = dasd_device_from_cdev(cdev);
3379 if (IS_ERR(device)) {
3380 dasd_remove_sysfs_files(cdev);
3381 return;
3382 }
3383 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3384 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3385 /* Already doing offline processing */
3386 dasd_put_device(device);
3387 dasd_remove_sysfs_files(cdev);
3388 return;
3389 }
3390 /*
3391 * This device is removed unconditionally. Set offline
3392 * flag to prevent dasd_open from opening it while it is
3393 * no quite down yet.
3394 */
3395 dasd_set_target_state(device, DASD_STATE_NEW);
3396 /* dasd_delete_device destroys the device reference. */
3397 block = device->block;
3398 dasd_delete_device(device);
3399 /*
3400 * life cycle of block is bound to device, so delete it after
3401 * device was safely removed
3402 */
3403 if (block)
3404 dasd_free_block(block);
3405
3406 dasd_remove_sysfs_files(cdev);
3407 }
3408 EXPORT_SYMBOL_GPL(dasd_generic_remove);
3409
3410 /*
3411 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either
3412 * the device is detected for the first time and is supposed to be used
3413 * or the user has started activation through sysfs.
3414 */
3415 int dasd_generic_set_online(struct ccw_device *cdev,
3416 struct dasd_discipline *base_discipline)
3417 {
3418 struct dasd_discipline *discipline;
3419 struct dasd_device *device;
3420 int rc;
3421
3422 /* first online clears initial online feature flag */
3423 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3424 device = dasd_create_device(cdev);
3425 if (IS_ERR(device))
3426 return PTR_ERR(device);
3427
3428 discipline = base_discipline;
3429 if (device->features & DASD_FEATURE_USEDIAG) {
3430 if (!dasd_diag_discipline_pointer) {
3431 /* Try to load the required module. */
3432 rc = request_module(DASD_DIAG_MOD);
3433 if (rc) {
3434 pr_warn("%s Setting the DASD online failed "
3435 "because the required module %s "
3436 "could not be loaded (rc=%d)\n",
3437 dev_name(&cdev->dev), DASD_DIAG_MOD,
3438 rc);
3439 dasd_delete_device(device);
3440 return -ENODEV;
3441 }
3442 }
3443 /* Module init could have failed, so check again here after
3444 * request_module(). */
3445 if (!dasd_diag_discipline_pointer) {
3446 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3447 dev_name(&cdev->dev));
3448 dasd_delete_device(device);
3449 return -ENODEV;
3450 }
3451 discipline = dasd_diag_discipline_pointer;
3452 }
3453 if (!try_module_get(base_discipline->owner)) {
3454 dasd_delete_device(device);
3455 return -EINVAL;
3456 }
3457 if (!try_module_get(discipline->owner)) {
3458 module_put(base_discipline->owner);
3459 dasd_delete_device(device);
3460 return -EINVAL;
3461 }
3462 device->base_discipline = base_discipline;
3463 device->discipline = discipline;
3464
3465 /* check_device will allocate block device if necessary */
3466 rc = discipline->check_device(device);
3467 if (rc) {
3468 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3469 dev_name(&cdev->dev), discipline->name, rc);
3470 module_put(discipline->owner);
3471 module_put(base_discipline->owner);
3472 dasd_delete_device(device);
3473 return rc;
3474 }
3475
3476 dasd_set_target_state(device, DASD_STATE_ONLINE);
3477 if (device->state <= DASD_STATE_KNOWN) {
3478 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3479 dev_name(&cdev->dev));
3480 rc = -ENODEV;
3481 dasd_set_target_state(device, DASD_STATE_NEW);
3482 if (device->block)
3483 dasd_free_block(device->block);
3484 dasd_delete_device(device);
3485 } else
3486 pr_debug("dasd_generic device %s found\n",
3487 dev_name(&cdev->dev));
3488
3489 wait_event(dasd_init_waitq, _wait_for_device(device));
3490
3491 dasd_put_device(device);
3492 return rc;
3493 }
3494 EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3495
3496 int dasd_generic_set_offline(struct ccw_device *cdev)
3497 {
3498 struct dasd_device *device;
3499 struct dasd_block *block;
3500 int max_count, open_count, rc;
3501
3502 rc = 0;
3503 device = dasd_device_from_cdev(cdev);
3504 if (IS_ERR(device))
3505 return PTR_ERR(device);
3506
3507 /*
3508 * We must make sure that this device is currently not in use.
3509 * The open_count is increased for every opener, that includes
3510 * the blkdev_get in dasd_scan_partitions. We are only interested
3511 * in the other openers.
3512 */
3513 if (device->block) {
3514 max_count = device->block->bdev ? 0 : -1;
3515 open_count = atomic_read(&device->block->open_count);
3516 if (open_count > max_count) {
3517 if (open_count > 0)
3518 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3519 dev_name(&cdev->dev), open_count);
3520 else
3521 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3522 dev_name(&cdev->dev));
3523 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3524 dasd_put_device(device);
3525 return -EBUSY;
3526 }
3527 }
3528
3529 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3530 /*
3531 * safe offline already running
3532 * could only be called by normal offline so safe_offline flag
3533 * needs to be removed to run normal offline and kill all I/O
3534 */
3535 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3536 /* Already doing normal offline processing */
3537 dasd_put_device(device);
3538 return -EBUSY;
3539 } else
3540 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3541
3542 } else
3543 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3544 /* Already doing offline processing */
3545 dasd_put_device(device);
3546 return -EBUSY;
3547 }
3548
3549 /*
3550 * if safe_offline called set safe_offline_running flag and
3551 * clear safe_offline so that a call to normal offline
3552 * can overrun safe_offline processing
3553 */
3554 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3555 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3556 /*
3557 * If we want to set the device safe offline all IO operations
3558 * should be finished before continuing the offline process
3559 * so sync bdev first and then wait for our queues to become
3560 * empty
3561 */
3562 /* sync blockdev and partitions */
3563 rc = fsync_bdev(device->block->bdev);
3564 if (rc != 0)
3565 goto interrupted;
3566
3567 /* schedule device tasklet and wait for completion */
3568 dasd_schedule_device_bh(device);
3569 rc = wait_event_interruptible(shutdown_waitq,
3570 _wait_for_empty_queues(device));
3571 if (rc != 0)
3572 goto interrupted;
3573 }
3574
3575 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3576 dasd_set_target_state(device, DASD_STATE_NEW);
3577 /* dasd_delete_device destroys the device reference. */
3578 block = device->block;
3579 dasd_delete_device(device);
3580 /*
3581 * life cycle of block is bound to device, so delete it after
3582 * device was safely removed
3583 */
3584 if (block)
3585 dasd_free_block(block);
3586 return 0;
3587
3588 interrupted:
3589 /* interrupted by signal */
3590 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3591 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3592 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3593 dasd_put_device(device);
3594 return rc;
3595 }
3596 EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3597
3598 int dasd_generic_last_path_gone(struct dasd_device *device)
3599 {
3600 struct dasd_ccw_req *cqr;
3601
3602 dev_warn(&device->cdev->dev, "No operational channel path is left "
3603 "for the device\n");
3604 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3605 /* First of all call extended error reporting. */
3606 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3607
3608 if (device->state < DASD_STATE_BASIC)
3609 return 0;
3610 /* Device is active. We want to keep it. */
3611 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3612 if ((cqr->status == DASD_CQR_IN_IO) ||
3613 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3614 cqr->status = DASD_CQR_QUEUED;
3615 cqr->retries++;
3616 }
3617 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3618 dasd_device_clear_timer(device);
3619 dasd_schedule_device_bh(device);
3620 return 1;
3621 }
3622 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3623
3624 int dasd_generic_path_operational(struct dasd_device *device)
3625 {
3626 dev_info(&device->cdev->dev, "A channel path to the device has become "
3627 "operational\n");
3628 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3629 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3630 if (device->stopped & DASD_UNRESUMED_PM) {
3631 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3632 dasd_restore_device(device);
3633 return 1;
3634 }
3635 dasd_schedule_device_bh(device);
3636 if (device->block)
3637 dasd_schedule_block_bh(device->block);
3638
3639 if (!device->stopped)
3640 wake_up(&generic_waitq);
3641
3642 return 1;
3643 }
3644 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3645
3646 int dasd_generic_notify(struct ccw_device *cdev, int event)
3647 {
3648 struct dasd_device *device;
3649 int ret;
3650
3651 device = dasd_device_from_cdev_locked(cdev);
3652 if (IS_ERR(device))
3653 return 0;
3654 ret = 0;
3655 switch (event) {
3656 case CIO_GONE:
3657 case CIO_BOXED:
3658 case CIO_NO_PATH:
3659 device->path_data.opm = 0;
3660 device->path_data.ppm = 0;
3661 device->path_data.npm = 0;
3662 ret = dasd_generic_last_path_gone(device);
3663 break;
3664 case CIO_OPER:
3665 ret = 1;
3666 if (device->path_data.opm)
3667 ret = dasd_generic_path_operational(device);
3668 break;
3669 }
3670 dasd_put_device(device);
3671 return ret;
3672 }
3673 EXPORT_SYMBOL_GPL(dasd_generic_notify);
3674
3675 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3676 {
3677 int chp;
3678 __u8 oldopm, eventlpm;
3679 struct dasd_device *device;
3680
3681 device = dasd_device_from_cdev_locked(cdev);
3682 if (IS_ERR(device))
3683 return;
3684 for (chp = 0; chp < 8; chp++) {
3685 eventlpm = 0x80 >> chp;
3686 if (path_event[chp] & PE_PATH_GONE) {
3687 oldopm = device->path_data.opm;
3688 device->path_data.opm &= ~eventlpm;
3689 device->path_data.ppm &= ~eventlpm;
3690 device->path_data.npm &= ~eventlpm;
3691 if (oldopm && !device->path_data.opm) {
3692 dev_warn(&device->cdev->dev,
3693 "No verified channel paths remain "
3694 "for the device\n");
3695 DBF_DEV_EVENT(DBF_WARNING, device,
3696 "%s", "last verified path gone");
3697 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3698 dasd_device_set_stop_bits(device,
3699 DASD_STOPPED_DC_WAIT);
3700 }
3701 }
3702 if (path_event[chp] & PE_PATH_AVAILABLE) {
3703 device->path_data.opm &= ~eventlpm;
3704 device->path_data.ppm &= ~eventlpm;
3705 device->path_data.npm &= ~eventlpm;
3706 device->path_data.tbvpm |= eventlpm;
3707 dasd_schedule_device_bh(device);
3708 }
3709 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3710 if (!(device->path_data.opm & eventlpm) &&
3711 !(device->path_data.tbvpm & eventlpm)) {
3712 /*
3713 * we can not establish a pathgroup on an
3714 * unavailable path, so trigger a path
3715 * verification first
3716 */
3717 device->path_data.tbvpm |= eventlpm;
3718 dasd_schedule_device_bh(device);
3719 }
3720 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3721 "Pathgroup re-established\n");
3722 if (device->discipline->kick_validate)
3723 device->discipline->kick_validate(device);
3724 }
3725 }
3726 dasd_put_device(device);
3727 }
3728 EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3729
3730 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3731 {
3732 if (!device->path_data.opm && lpm) {
3733 device->path_data.opm = lpm;
3734 dasd_generic_path_operational(device);
3735 } else
3736 device->path_data.opm |= lpm;
3737 return 0;
3738 }
3739 EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3740
3741
3742 int dasd_generic_pm_freeze(struct ccw_device *cdev)
3743 {
3744 struct dasd_device *device = dasd_device_from_cdev(cdev);
3745 struct list_head freeze_queue;
3746 struct dasd_ccw_req *cqr, *n;
3747 struct dasd_ccw_req *refers;
3748 int rc;
3749
3750 if (IS_ERR(device))
3751 return PTR_ERR(device);
3752
3753 /* mark device as suspended */
3754 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3755
3756 if (device->discipline->freeze)
3757 rc = device->discipline->freeze(device);
3758
3759 /* disallow new I/O */
3760 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3761
3762 /* clear active requests and requeue them to block layer if possible */
3763 INIT_LIST_HEAD(&freeze_queue);
3764 spin_lock_irq(get_ccwdev_lock(cdev));
3765 rc = 0;
3766 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3767 /* Check status and move request to flush_queue */
3768 if (cqr->status == DASD_CQR_IN_IO) {
3769 rc = device->discipline->term_IO(cqr);
3770 if (rc) {
3771 /* unable to terminate requeust */
3772 dev_err(&device->cdev->dev,
3773 "Unable to terminate request %p "
3774 "on suspend\n", cqr);
3775 spin_unlock_irq(get_ccwdev_lock(cdev));
3776 dasd_put_device(device);
3777 return rc;
3778 }
3779 }
3780 list_move_tail(&cqr->devlist, &freeze_queue);
3781 }
3782 spin_unlock_irq(get_ccwdev_lock(cdev));
3783
3784 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3785 wait_event(dasd_flush_wq,
3786 (cqr->status != DASD_CQR_CLEAR_PENDING));
3787 if (cqr->status == DASD_CQR_CLEARED)
3788 cqr->status = DASD_CQR_QUEUED;
3789
3790 /* requeue requests to blocklayer will only work for
3791 block device requests */
3792 if (_dasd_requeue_request(cqr))
3793 continue;
3794
3795 /* remove requests from device and block queue */
3796 list_del_init(&cqr->devlist);
3797 while (cqr->refers != NULL) {
3798 refers = cqr->refers;
3799 /* remove the request from the block queue */
3800 list_del(&cqr->blocklist);
3801 /* free the finished erp request */
3802 dasd_free_erp_request(cqr, cqr->memdev);
3803 cqr = refers;
3804 }
3805 if (cqr->block)
3806 list_del_init(&cqr->blocklist);
3807 cqr->block->base->discipline->free_cp(
3808 cqr, (struct request *) cqr->callback_data);
3809 }
3810
3811 /*
3812 * if requests remain then they are internal request
3813 * and go back to the device queue
3814 */
3815 if (!list_empty(&freeze_queue)) {
3816 /* move freeze_queue to start of the ccw_queue */
3817 spin_lock_irq(get_ccwdev_lock(cdev));
3818 list_splice_tail(&freeze_queue, &device->ccw_queue);
3819 spin_unlock_irq(get_ccwdev_lock(cdev));
3820 }
3821 dasd_put_device(device);
3822 return rc;
3823 }
3824 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3825
3826 int dasd_generic_restore_device(struct ccw_device *cdev)
3827 {
3828 struct dasd_device *device = dasd_device_from_cdev(cdev);
3829 int rc = 0;
3830
3831 if (IS_ERR(device))
3832 return PTR_ERR(device);
3833
3834 /* allow new IO again */
3835 dasd_device_remove_stop_bits(device,
3836 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3837
3838 dasd_schedule_device_bh(device);
3839
3840 /*
3841 * call discipline restore function
3842 * if device is stopped do nothing e.g. for disconnected devices
3843 */
3844 if (device->discipline->restore && !(device->stopped))
3845 rc = device->discipline->restore(device);
3846 if (rc || device->stopped)
3847 /*
3848 * if the resume failed for the DASD we put it in
3849 * an UNRESUMED stop state
3850 */
3851 device->stopped |= DASD_UNRESUMED_PM;
3852
3853 if (device->block)
3854 dasd_schedule_block_bh(device->block);
3855
3856 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3857 dasd_put_device(device);
3858 return 0;
3859 }
3860 EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3861
3862 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3863 void *rdc_buffer,
3864 int rdc_buffer_size,
3865 int magic)
3866 {
3867 struct dasd_ccw_req *cqr;
3868 struct ccw1 *ccw;
3869 unsigned long *idaw;
3870
3871 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
3872
3873 if (IS_ERR(cqr)) {
3874 /* internal error 13 - Allocating the RDC request failed*/
3875 dev_err(&device->cdev->dev,
3876 "An error occurred in the DASD device driver, "
3877 "reason=%s\n", "13");
3878 return cqr;
3879 }
3880
3881 ccw = cqr->cpaddr;
3882 ccw->cmd_code = CCW_CMD_RDC;
3883 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3884 idaw = (unsigned long *) (cqr->data);
3885 ccw->cda = (__u32)(addr_t) idaw;
3886 ccw->flags = CCW_FLAG_IDA;
3887 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3888 } else {
3889 ccw->cda = (__u32)(addr_t) rdc_buffer;
3890 ccw->flags = 0;
3891 }
3892
3893 ccw->count = rdc_buffer_size;
3894 cqr->startdev = device;
3895 cqr->memdev = device;
3896 cqr->expires = 10*HZ;
3897 cqr->retries = 256;
3898 cqr->buildclk = get_tod_clock();
3899 cqr->status = DASD_CQR_FILLED;
3900 return cqr;
3901 }
3902
3903
3904 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3905 void *rdc_buffer, int rdc_buffer_size)
3906 {
3907 int ret;
3908 struct dasd_ccw_req *cqr;
3909
3910 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3911 magic);
3912 if (IS_ERR(cqr))
3913 return PTR_ERR(cqr);
3914
3915 ret = dasd_sleep_on(cqr);
3916 dasd_sfree_request(cqr, cqr->memdev);
3917 return ret;
3918 }
3919 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3920
3921 /*
3922 * In command mode and transport mode we need to look for sense
3923 * data in different places. The sense data itself is allways
3924 * an array of 32 bytes, so we can unify the sense data access
3925 * for both modes.
3926 */
3927 char *dasd_get_sense(struct irb *irb)
3928 {
3929 struct tsb *tsb = NULL;
3930 char *sense = NULL;
3931
3932 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3933 if (irb->scsw.tm.tcw)
3934 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3935 irb->scsw.tm.tcw);
3936 if (tsb && tsb->length == 64 && tsb->flags)
3937 switch (tsb->flags & 0x07) {
3938 case 1: /* tsa_iostat */
3939 sense = tsb->tsa.iostat.sense;
3940 break;
3941 case 2: /* tsa_ddpc */
3942 sense = tsb->tsa.ddpc.sense;
3943 break;
3944 default:
3945 /* currently we don't use interrogate data */
3946 break;
3947 }
3948 } else if (irb->esw.esw0.erw.cons) {
3949 sense = irb->ecw;
3950 }
3951 return sense;
3952 }
3953 EXPORT_SYMBOL_GPL(dasd_get_sense);
3954
3955 void dasd_generic_shutdown(struct ccw_device *cdev)
3956 {
3957 struct dasd_device *device;
3958
3959 device = dasd_device_from_cdev(cdev);
3960 if (IS_ERR(device))
3961 return;
3962
3963 if (device->block)
3964 dasd_schedule_block_bh(device->block);
3965
3966 dasd_schedule_device_bh(device);
3967
3968 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3969 }
3970 EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3971
3972 static int __init dasd_init(void)
3973 {
3974 int rc;
3975
3976 init_waitqueue_head(&dasd_init_waitq);
3977 init_waitqueue_head(&dasd_flush_wq);
3978 init_waitqueue_head(&generic_waitq);
3979 init_waitqueue_head(&shutdown_waitq);
3980
3981 /* register 'common' DASD debug area, used for all DBF_XXX calls */
3982 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3983 if (dasd_debug_area == NULL) {
3984 rc = -ENOMEM;
3985 goto failed;
3986 }
3987 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3988 debug_set_level(dasd_debug_area, DBF_WARNING);
3989
3990 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3991
3992 dasd_diag_discipline_pointer = NULL;
3993
3994 dasd_statistics_createroot();
3995
3996 rc = dasd_devmap_init();
3997 if (rc)
3998 goto failed;
3999 rc = dasd_gendisk_init();
4000 if (rc)
4001 goto failed;
4002 rc = dasd_parse();
4003 if (rc)
4004 goto failed;
4005 rc = dasd_eer_init();
4006 if (rc)
4007 goto failed;
4008 #ifdef CONFIG_PROC_FS
4009 rc = dasd_proc_init();
4010 if (rc)
4011 goto failed;
4012 #endif
4013
4014 return 0;
4015 failed:
4016 pr_info("The DASD device driver could not be initialized\n");
4017 dasd_exit();
4018 return rc;
4019 }
4020
4021 module_init(dasd_init);
4022 module_exit(dasd_exit);
Linux kernel - Deliverables
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