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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
33#define PRINTK_HEADER "dasd:"
34
35#include "dasd_int.h"
36
37
38
39#define DASD_CHANQ_MAX_SIZE 4
40
41#define DASD_DIAG_MOD "dasd_diag_mod"
42
43
44
45
46debug_info_t *dasd_debug_area;
47EXPORT_SYMBOL(dasd_debug_area);
48static struct dentry *dasd_debugfs_root_entry;
49struct dasd_discipline *dasd_diag_discipline_pointer;
50EXPORT_SYMBOL(dasd_diag_discipline_pointer);
51void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *);
52
53MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>");
54MODULE_DESCRIPTION("Linux on S/390 DASD device driver,"
55 " Copyright IBM Corp. 2000");
56MODULE_SUPPORTED_DEVICE("dasd");
57MODULE_LICENSE("GPL");
58
59
60
61
62static int dasd_alloc_queue(struct dasd_block *);
63static void dasd_setup_queue(struct dasd_block *);
64static void dasd_free_queue(struct dasd_block *);
65static void dasd_flush_request_queue(struct dasd_block *);
66static int dasd_flush_block_queue(struct dasd_block *);
67static void dasd_device_tasklet(struct dasd_device *);
68static void dasd_block_tasklet(struct dasd_block *);
69static void do_kick_device(struct work_struct *);
70static void do_restore_device(struct work_struct *);
71static void do_reload_device(struct work_struct *);
72static void do_requeue_requests(struct work_struct *);
73static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
74static void dasd_device_timeout(unsigned long);
75static void dasd_block_timeout(unsigned long);
76static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
77static void dasd_profile_init(struct dasd_profile *, struct dentry *);
78static void dasd_profile_exit(struct dasd_profile *);
79static void dasd_hosts_init(struct dentry *, struct dasd_device *);
80static void dasd_hosts_exit(struct dasd_device *);
81
82
83
84
85static wait_queue_head_t dasd_init_waitq;
86static wait_queue_head_t dasd_flush_wq;
87static wait_queue_head_t generic_waitq;
88static wait_queue_head_t shutdown_waitq;
89
90
91
92
93struct dasd_device *dasd_alloc_device(void)
94{
95 struct dasd_device *device;
96
97 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
98 if (!device)
99 return ERR_PTR(-ENOMEM);
100
101
102 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
103 if (!device->ccw_mem) {
104 kfree(device);
105 return ERR_PTR(-ENOMEM);
106 }
107
108 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
109 if (!device->erp_mem) {
110 free_pages((unsigned long) device->ccw_mem, 1);
111 kfree(device);
112 return ERR_PTR(-ENOMEM);
113 }
114
115 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
116 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
117 spin_lock_init(&device->mem_lock);
118 atomic_set(&device->tasklet_scheduled, 0);
119 tasklet_init(&device->tasklet,
120 (void (*)(unsigned long)) dasd_device_tasklet,
121 (unsigned long) device);
122 INIT_LIST_HEAD(&device->ccw_queue);
123 init_timer(&device->timer);
124 device->timer.function = dasd_device_timeout;
125 device->timer.data = (unsigned long) device;
126 INIT_WORK(&device->kick_work, do_kick_device);
127 INIT_WORK(&device->restore_device, do_restore_device);
128 INIT_WORK(&device->reload_device, do_reload_device);
129 INIT_WORK(&device->requeue_requests, do_requeue_requests);
130 device->state = DASD_STATE_NEW;
131 device->target = DASD_STATE_NEW;
132 mutex_init(&device->state_mutex);
133 spin_lock_init(&device->profile.lock);
134 return device;
135}
136
137
138
139
140void dasd_free_device(struct dasd_device *device)
141{
142 kfree(device->private);
143 free_page((unsigned long) device->erp_mem);
144 free_pages((unsigned long) device->ccw_mem, 1);
145 kfree(device);
146}
147
148
149
150
151struct dasd_block *dasd_alloc_block(void)
152{
153 struct dasd_block *block;
154
155 block = kzalloc(sizeof(*block), GFP_ATOMIC);
156 if (!block)
157 return ERR_PTR(-ENOMEM);
158
159 atomic_set(&block->open_count, -1);
160
161 spin_lock_init(&block->request_queue_lock);
162 atomic_set(&block->tasklet_scheduled, 0);
163 tasklet_init(&block->tasklet,
164 (void (*)(unsigned long)) dasd_block_tasklet,
165 (unsigned long) block);
166 INIT_LIST_HEAD(&block->ccw_queue);
167 spin_lock_init(&block->queue_lock);
168 init_timer(&block->timer);
169 block->timer.function = dasd_block_timeout;
170 block->timer.data = (unsigned long) block;
171 spin_lock_init(&block->profile.lock);
172
173 return block;
174}
175EXPORT_SYMBOL_GPL(dasd_alloc_block);
176
177
178
179
180void dasd_free_block(struct dasd_block *block)
181{
182 kfree(block);
183}
184EXPORT_SYMBOL_GPL(dasd_free_block);
185
186
187
188
189static int dasd_state_new_to_known(struct dasd_device *device)
190{
191 int rc;
192
193
194
195
196
197 dasd_get_device(device);
198
199 if (device->block) {
200 rc = dasd_alloc_queue(device->block);
201 if (rc) {
202 dasd_put_device(device);
203 return rc;
204 }
205 }
206 device->state = DASD_STATE_KNOWN;
207 return 0;
208}
209
210
211
212
213static int dasd_state_known_to_new(struct dasd_device *device)
214{
215
216 dasd_eer_disable(device);
217 device->state = DASD_STATE_NEW;
218
219 if (device->block)
220 dasd_free_queue(device->block);
221
222
223 dasd_put_device(device);
224 return 0;
225}
226
227static struct dentry *dasd_debugfs_setup(const char *name,
228 struct dentry *base_dentry)
229{
230 struct dentry *pde;
231
232 if (!base_dentry)
233 return NULL;
234 pde = debugfs_create_dir(name, base_dentry);
235 if (!pde || IS_ERR(pde))
236 return NULL;
237 return pde;
238}
239
240
241
242
243static int dasd_state_known_to_basic(struct dasd_device *device)
244{
245 struct dasd_block *block = device->block;
246 int rc = 0;
247
248
249 if (block) {
250 rc = dasd_gendisk_alloc(block);
251 if (rc)
252 return rc;
253 block->debugfs_dentry =
254 dasd_debugfs_setup(block->gdp->disk_name,
255 dasd_debugfs_root_entry);
256 dasd_profile_init(&block->profile, block->debugfs_dentry);
257 if (dasd_global_profile_level == DASD_PROFILE_ON)
258 dasd_profile_on(&device->block->profile);
259 }
260 device->debugfs_dentry =
261 dasd_debugfs_setup(dev_name(&device->cdev->dev),
262 dasd_debugfs_root_entry);
263 dasd_profile_init(&device->profile, device->debugfs_dentry);
264 dasd_hosts_init(device->debugfs_dentry, device);
265
266
267 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
268 8 * sizeof(long));
269 debug_register_view(device->debug_area, &debug_sprintf_view);
270 debug_set_level(device->debug_area, DBF_WARNING);
271 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
272
273 device->state = DASD_STATE_BASIC;
274
275 return rc;
276}
277
278
279
280
281static int dasd_state_basic_to_known(struct dasd_device *device)
282{
283 int rc;
284
285 if (device->discipline->basic_to_known) {
286 rc = device->discipline->basic_to_known(device);
287 if (rc)
288 return rc;
289 }
290
291 if (device->block) {
292 dasd_profile_exit(&device->block->profile);
293 debugfs_remove(device->block->debugfs_dentry);
294 dasd_gendisk_free(device->block);
295 dasd_block_clear_timer(device->block);
296 }
297 rc = dasd_flush_device_queue(device);
298 if (rc)
299 return rc;
300 dasd_device_clear_timer(device);
301 dasd_profile_exit(&device->profile);
302 dasd_hosts_exit(device);
303 debugfs_remove(device->debugfs_dentry);
304 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
305 if (device->debug_area != NULL) {
306 debug_unregister(device->debug_area);
307 device->debug_area = NULL;
308 }
309 device->state = DASD_STATE_KNOWN;
310 return 0;
311}
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327static int dasd_state_basic_to_ready(struct dasd_device *device)
328{
329 int rc;
330 struct dasd_block *block;
331 struct gendisk *disk;
332
333 rc = 0;
334 block = device->block;
335
336 if (block) {
337 if (block->base->discipline->do_analysis != NULL)
338 rc = block->base->discipline->do_analysis(block);
339 if (rc) {
340 if (rc != -EAGAIN) {
341 device->state = DASD_STATE_UNFMT;
342 disk = device->block->gdp;
343 kobject_uevent(&disk_to_dev(disk)->kobj,
344 KOBJ_CHANGE);
345 goto out;
346 }
347 return rc;
348 }
349 dasd_setup_queue(block);
350 set_capacity(block->gdp,
351 block->blocks << block->s2b_shift);
352 device->state = DASD_STATE_READY;
353 rc = dasd_scan_partitions(block);
354 if (rc) {
355 device->state = DASD_STATE_BASIC;
356 return rc;
357 }
358 } else {
359 device->state = DASD_STATE_READY;
360 }
361out:
362 if (device->discipline->basic_to_ready)
363 rc = device->discipline->basic_to_ready(device);
364 return rc;
365}
366
367static inline
368int _wait_for_empty_queues(struct dasd_device *device)
369{
370 if (device->block)
371 return list_empty(&device->ccw_queue) &&
372 list_empty(&device->block->ccw_queue);
373 else
374 return list_empty(&device->ccw_queue);
375}
376
377
378
379
380
381
382static int dasd_state_ready_to_basic(struct dasd_device *device)
383{
384 int rc;
385
386 device->state = DASD_STATE_BASIC;
387 if (device->block) {
388 struct dasd_block *block = device->block;
389 rc = dasd_flush_block_queue(block);
390 if (rc) {
391 device->state = DASD_STATE_READY;
392 return rc;
393 }
394 dasd_flush_request_queue(block);
395 dasd_destroy_partitions(block);
396 block->blocks = 0;
397 block->bp_block = 0;
398 block->s2b_shift = 0;
399 }
400 return 0;
401}
402
403
404
405
406static int dasd_state_unfmt_to_basic(struct dasd_device *device)
407{
408 device->state = DASD_STATE_BASIC;
409 return 0;
410}
411
412
413
414
415
416
417static int
418dasd_state_ready_to_online(struct dasd_device * device)
419{
420 struct gendisk *disk;
421 struct disk_part_iter piter;
422 struct hd_struct *part;
423
424 device->state = DASD_STATE_ONLINE;
425 if (device->block) {
426 dasd_schedule_block_bh(device->block);
427 if ((device->features & DASD_FEATURE_USERAW)) {
428 disk = device->block->gdp;
429 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
430 return 0;
431 }
432 disk = device->block->bdev->bd_disk;
433 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
434 while ((part = disk_part_iter_next(&piter)))
435 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
436 disk_part_iter_exit(&piter);
437 }
438 return 0;
439}
440
441
442
443
444static int dasd_state_online_to_ready(struct dasd_device *device)
445{
446 int rc;
447 struct gendisk *disk;
448 struct disk_part_iter piter;
449 struct hd_struct *part;
450
451 if (device->discipline->online_to_ready) {
452 rc = device->discipline->online_to_ready(device);
453 if (rc)
454 return rc;
455 }
456
457 device->state = DASD_STATE_READY;
458 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
459 disk = device->block->bdev->bd_disk;
460 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
461 while ((part = disk_part_iter_next(&piter)))
462 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
463 disk_part_iter_exit(&piter);
464 }
465 return 0;
466}
467
468
469
470
471static int dasd_increase_state(struct dasd_device *device)
472{
473 int rc;
474
475 rc = 0;
476 if (device->state == DASD_STATE_NEW &&
477 device->target >= DASD_STATE_KNOWN)
478 rc = dasd_state_new_to_known(device);
479
480 if (!rc &&
481 device->state == DASD_STATE_KNOWN &&
482 device->target >= DASD_STATE_BASIC)
483 rc = dasd_state_known_to_basic(device);
484
485 if (!rc &&
486 device->state == DASD_STATE_BASIC &&
487 device->target >= DASD_STATE_READY)
488 rc = dasd_state_basic_to_ready(device);
489
490 if (!rc &&
491 device->state == DASD_STATE_UNFMT &&
492 device->target > DASD_STATE_UNFMT)
493 rc = -EPERM;
494
495 if (!rc &&
496 device->state == DASD_STATE_READY &&
497 device->target >= DASD_STATE_ONLINE)
498 rc = dasd_state_ready_to_online(device);
499
500 return rc;
501}
502
503
504
505
506static int dasd_decrease_state(struct dasd_device *device)
507{
508 int rc;
509
510 rc = 0;
511 if (device->state == DASD_STATE_ONLINE &&
512 device->target <= DASD_STATE_READY)
513 rc = dasd_state_online_to_ready(device);
514
515 if (!rc &&
516 device->state == DASD_STATE_READY &&
517 device->target <= DASD_STATE_BASIC)
518 rc = dasd_state_ready_to_basic(device);
519
520 if (!rc &&
521 device->state == DASD_STATE_UNFMT &&
522 device->target <= DASD_STATE_BASIC)
523 rc = dasd_state_unfmt_to_basic(device);
524
525 if (!rc &&
526 device->state == DASD_STATE_BASIC &&
527 device->target <= DASD_STATE_KNOWN)
528 rc = dasd_state_basic_to_known(device);
529
530 if (!rc &&
531 device->state == DASD_STATE_KNOWN &&
532 device->target <= DASD_STATE_NEW)
533 rc = dasd_state_known_to_new(device);
534
535 return rc;
536}
537
538
539
540
541static void dasd_change_state(struct dasd_device *device)
542{
543 int rc;
544
545 if (device->state == device->target)
546
547 return;
548 if (device->state < device->target)
549 rc = dasd_increase_state(device);
550 else
551 rc = dasd_decrease_state(device);
552 if (rc == -EAGAIN)
553 return;
554 if (rc)
555 device->target = device->state;
556
557
558 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
559
560 if (device->state == device->target)
561 wake_up(&dasd_init_waitq);
562}
563
564
565
566
567
568
569
570static void do_kick_device(struct work_struct *work)
571{
572 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
573 mutex_lock(&device->state_mutex);
574 dasd_change_state(device);
575 mutex_unlock(&device->state_mutex);
576 dasd_schedule_device_bh(device);
577 dasd_put_device(device);
578}
579
580void dasd_kick_device(struct dasd_device *device)
581{
582 dasd_get_device(device);
583
584 if (!schedule_work(&device->kick_work))
585 dasd_put_device(device);
586}
587EXPORT_SYMBOL(dasd_kick_device);
588
589
590
591
592
593static void do_reload_device(struct work_struct *work)
594{
595 struct dasd_device *device = container_of(work, struct dasd_device,
596 reload_device);
597 device->discipline->reload(device);
598 dasd_put_device(device);
599}
600
601void dasd_reload_device(struct dasd_device *device)
602{
603 dasd_get_device(device);
604
605 if (!schedule_work(&device->reload_device))
606 dasd_put_device(device);
607}
608EXPORT_SYMBOL(dasd_reload_device);
609
610
611
612
613
614static void do_restore_device(struct work_struct *work)
615{
616 struct dasd_device *device = container_of(work, struct dasd_device,
617 restore_device);
618 device->cdev->drv->restore(device->cdev);
619 dasd_put_device(device);
620}
621
622void dasd_restore_device(struct dasd_device *device)
623{
624 dasd_get_device(device);
625
626 if (!schedule_work(&device->restore_device))
627 dasd_put_device(device);
628}
629
630
631
632
633void dasd_set_target_state(struct dasd_device *device, int target)
634{
635 dasd_get_device(device);
636 mutex_lock(&device->state_mutex);
637
638 if (dasd_probeonly && target > DASD_STATE_READY)
639 target = DASD_STATE_READY;
640 if (device->target != target) {
641 if (device->state == target)
642 wake_up(&dasd_init_waitq);
643 device->target = target;
644 }
645 if (device->state != device->target)
646 dasd_change_state(device);
647 mutex_unlock(&device->state_mutex);
648 dasd_put_device(device);
649}
650EXPORT_SYMBOL(dasd_set_target_state);
651
652
653
654
655static inline int _wait_for_device(struct dasd_device *device)
656{
657 return (device->state == device->target);
658}
659
660void dasd_enable_device(struct dasd_device *device)
661{
662 dasd_set_target_state(device, DASD_STATE_ONLINE);
663 if (device->state <= DASD_STATE_KNOWN)
664
665 dasd_set_target_state(device, DASD_STATE_NEW);
666
667 wait_event(dasd_init_waitq, _wait_for_device(device));
668
669 dasd_reload_device(device);
670 if (device->discipline->kick_validate)
671 device->discipline->kick_validate(device);
672}
673EXPORT_SYMBOL(dasd_enable_device);
674
675
676
677
678
679unsigned int dasd_global_profile_level = DASD_PROFILE_OFF;
680
681#ifdef CONFIG_DASD_PROFILE
682struct dasd_profile dasd_global_profile = {
683 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock),
684};
685static struct dentry *dasd_debugfs_global_entry;
686
687
688
689
690static void dasd_profile_start(struct dasd_block *block,
691 struct dasd_ccw_req *cqr,
692 struct request *req)
693{
694 struct list_head *l;
695 unsigned int counter;
696 struct dasd_device *device;
697
698
699 counter = 0;
700 if (dasd_global_profile_level || block->profile.data)
701 list_for_each(l, &block->ccw_queue)
702 if (++counter >= 31)
703 break;
704
705 spin_lock(&dasd_global_profile.lock);
706 if (dasd_global_profile.data) {
707 dasd_global_profile.data->dasd_io_nr_req[counter]++;
708 if (rq_data_dir(req) == READ)
709 dasd_global_profile.data->dasd_read_nr_req[counter]++;
710 }
711 spin_unlock(&dasd_global_profile.lock);
712
713 spin_lock(&block->profile.lock);
714 if (block->profile.data) {
715 block->profile.data->dasd_io_nr_req[counter]++;
716 if (rq_data_dir(req) == READ)
717 block->profile.data->dasd_read_nr_req[counter]++;
718 }
719 spin_unlock(&block->profile.lock);
720
721
722
723
724
725
726 device = cqr->startdev;
727 if (device->profile.data) {
728 counter = 1;
729 list_for_each(l, &device->ccw_queue)
730 if (++counter >= 31)
731 break;
732 }
733 spin_lock(&device->profile.lock);
734 if (device->profile.data) {
735 device->profile.data->dasd_io_nr_req[counter]++;
736 if (rq_data_dir(req) == READ)
737 device->profile.data->dasd_read_nr_req[counter]++;
738 }
739 spin_unlock(&device->profile.lock);
740}
741
742
743
744
745
746#define dasd_profile_counter(value, index) \
747{ \
748 for (index = 0; index < 31 && value >> (2+index); index++) \
749 ; \
750}
751
752static void dasd_profile_end_add_data(struct dasd_profile_info *data,
753 int is_alias,
754 int is_tpm,
755 int is_read,
756 long sectors,
757 int sectors_ind,
758 int tottime_ind,
759 int tottimeps_ind,
760 int strtime_ind,
761 int irqtime_ind,
762 int irqtimeps_ind,
763 int endtime_ind)
764{
765
766 if (data->dasd_io_reqs == UINT_MAX) {
767 memset(data, 0, sizeof(*data));
768 getnstimeofday(&data->starttod);
769 }
770 data->dasd_io_reqs++;
771 data->dasd_io_sects += sectors;
772 if (is_alias)
773 data->dasd_io_alias++;
774 if (is_tpm)
775 data->dasd_io_tpm++;
776
777 data->dasd_io_secs[sectors_ind]++;
778 data->dasd_io_times[tottime_ind]++;
779 data->dasd_io_timps[tottimeps_ind]++;
780 data->dasd_io_time1[strtime_ind]++;
781 data->dasd_io_time2[irqtime_ind]++;
782 data->dasd_io_time2ps[irqtimeps_ind]++;
783 data->dasd_io_time3[endtime_ind]++;
784
785 if (is_read) {
786 data->dasd_read_reqs++;
787 data->dasd_read_sects += sectors;
788 if (is_alias)
789 data->dasd_read_alias++;
790 if (is_tpm)
791 data->dasd_read_tpm++;
792 data->dasd_read_secs[sectors_ind]++;
793 data->dasd_read_times[tottime_ind]++;
794 data->dasd_read_time1[strtime_ind]++;
795 data->dasd_read_time2[irqtime_ind]++;
796 data->dasd_read_time3[endtime_ind]++;
797 }
798}
799
800static void dasd_profile_end(struct dasd_block *block,
801 struct dasd_ccw_req *cqr,
802 struct request *req)
803{
804 long strtime, irqtime, endtime, tottime;
805 long tottimeps, sectors;
806 struct dasd_device *device;
807 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind;
808 int irqtime_ind, irqtimeps_ind, endtime_ind;
809
810 device = cqr->startdev;
811 if (!(dasd_global_profile_level ||
812 block->profile.data ||
813 device->profile.data))
814 return;
815
816 sectors = blk_rq_sectors(req);
817 if (!cqr->buildclk || !cqr->startclk ||
818 !cqr->stopclk || !cqr->endclk ||
819 !sectors)
820 return;
821
822 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
823 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
824 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
825 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
826 tottimeps = tottime / sectors;
827
828 dasd_profile_counter(sectors, sectors_ind);
829 dasd_profile_counter(tottime, tottime_ind);
830 dasd_profile_counter(tottimeps, tottimeps_ind);
831 dasd_profile_counter(strtime, strtime_ind);
832 dasd_profile_counter(irqtime, irqtime_ind);
833 dasd_profile_counter(irqtime / sectors, irqtimeps_ind);
834 dasd_profile_counter(endtime, endtime_ind);
835
836 spin_lock(&dasd_global_profile.lock);
837 if (dasd_global_profile.data) {
838 dasd_profile_end_add_data(dasd_global_profile.data,
839 cqr->startdev != block->base,
840 cqr->cpmode == 1,
841 rq_data_dir(req) == READ,
842 sectors, sectors_ind, tottime_ind,
843 tottimeps_ind, strtime_ind,
844 irqtime_ind, irqtimeps_ind,
845 endtime_ind);
846 }
847 spin_unlock(&dasd_global_profile.lock);
848
849 spin_lock(&block->profile.lock);
850 if (block->profile.data)
851 dasd_profile_end_add_data(block->profile.data,
852 cqr->startdev != block->base,
853 cqr->cpmode == 1,
854 rq_data_dir(req) == READ,
855 sectors, sectors_ind, tottime_ind,
856 tottimeps_ind, strtime_ind,
857 irqtime_ind, irqtimeps_ind,
858 endtime_ind);
859 spin_unlock(&block->profile.lock);
860
861 spin_lock(&device->profile.lock);
862 if (device->profile.data)
863 dasd_profile_end_add_data(device->profile.data,
864 cqr->startdev != block->base,
865 cqr->cpmode == 1,
866 rq_data_dir(req) == READ,
867 sectors, sectors_ind, tottime_ind,
868 tottimeps_ind, strtime_ind,
869 irqtime_ind, irqtimeps_ind,
870 endtime_ind);
871 spin_unlock(&device->profile.lock);
872}
873
874void dasd_profile_reset(struct dasd_profile *profile)
875{
876 struct dasd_profile_info *data;
877
878 spin_lock_bh(&profile->lock);
879 data = profile->data;
880 if (!data) {
881 spin_unlock_bh(&profile->lock);
882 return;
883 }
884 memset(data, 0, sizeof(*data));
885 getnstimeofday(&data->starttod);
886 spin_unlock_bh(&profile->lock);
887}
888
889int dasd_profile_on(struct dasd_profile *profile)
890{
891 struct dasd_profile_info *data;
892
893 data = kzalloc(sizeof(*data), GFP_KERNEL);
894 if (!data)
895 return -ENOMEM;
896 spin_lock_bh(&profile->lock);
897 if (profile->data) {
898 spin_unlock_bh(&profile->lock);
899 kfree(data);
900 return 0;
901 }
902 getnstimeofday(&data->starttod);
903 profile->data = data;
904 spin_unlock_bh(&profile->lock);
905 return 0;
906}
907
908void dasd_profile_off(struct dasd_profile *profile)
909{
910 spin_lock_bh(&profile->lock);
911 kfree(profile->data);
912 profile->data = NULL;
913 spin_unlock_bh(&profile->lock);
914}
915
916char *dasd_get_user_string(const char __user *user_buf, size_t user_len)
917{
918 char *buffer;
919
920 buffer = vmalloc(user_len + 1);
921 if (buffer == NULL)
922 return ERR_PTR(-ENOMEM);
923 if (copy_from_user(buffer, user_buf, user_len) != 0) {
924 vfree(buffer);
925 return ERR_PTR(-EFAULT);
926 }
927
928 if (buffer[user_len - 1] == '\n')
929 buffer[user_len - 1] = 0;
930 else
931 buffer[user_len] = 0;
932 return buffer;
933}
934
935static ssize_t dasd_stats_write(struct file *file,
936 const char __user *user_buf,
937 size_t user_len, loff_t *pos)
938{
939 char *buffer, *str;
940 int rc;
941 struct seq_file *m = (struct seq_file *)file->private_data;
942 struct dasd_profile *prof = m->private;
943
944 if (user_len > 65536)
945 user_len = 65536;
946 buffer = dasd_get_user_string(user_buf, user_len);
947 if (IS_ERR(buffer))
948 return PTR_ERR(buffer);
949
950 str = skip_spaces(buffer);
951 rc = user_len;
952 if (strncmp(str, "reset", 5) == 0) {
953 dasd_profile_reset(prof);
954 } else if (strncmp(str, "on", 2) == 0) {
955 rc = dasd_profile_on(prof);
956 if (rc)
957 goto out;
958 rc = user_len;
959 if (prof == &dasd_global_profile) {
960 dasd_profile_reset(prof);
961 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY;
962 }
963 } else if (strncmp(str, "off", 3) == 0) {
964 if (prof == &dasd_global_profile)
965 dasd_global_profile_level = DASD_PROFILE_OFF;
966 dasd_profile_off(prof);
967 } else
968 rc = -EINVAL;
969out:
970 vfree(buffer);
971 return rc;
972}
973
974static void dasd_stats_array(struct seq_file *m, unsigned int *array)
975{
976 int i;
977
978 for (i = 0; i < 32; i++)
979 seq_printf(m, "%u ", array[i]);
980 seq_putc(m, '\n');
981}
982
983static void dasd_stats_seq_print(struct seq_file *m,
984 struct dasd_profile_info *data)
985{
986 seq_printf(m, "start_time %ld.%09ld\n",
987 data->starttod.tv_sec, data->starttod.tv_nsec);
988 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
989 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
990 seq_printf(m, "total_pav %u\n", data->dasd_io_alias);
991 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm);
992 seq_puts(m, "histogram_sectors ");
993 dasd_stats_array(m, data->dasd_io_secs);
994 seq_puts(m, "histogram_io_times ");
995 dasd_stats_array(m, data->dasd_io_times);
996 seq_puts(m, "histogram_io_times_weighted ");
997 dasd_stats_array(m, data->dasd_io_timps);
998 seq_puts(m, "histogram_time_build_to_ssch ");
999 dasd_stats_array(m, data->dasd_io_time1);
1000 seq_puts(m, "histogram_time_ssch_to_irq ");
1001 dasd_stats_array(m, data->dasd_io_time2);
1002 seq_puts(m, "histogram_time_ssch_to_irq_weighted ");
1003 dasd_stats_array(m, data->dasd_io_time2ps);
1004 seq_puts(m, "histogram_time_irq_to_end ");
1005 dasd_stats_array(m, data->dasd_io_time3);
1006 seq_puts(m, "histogram_ccw_queue_length ");
1007 dasd_stats_array(m, data->dasd_io_nr_req);
1008 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs);
1009 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects);
1010 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias);
1011 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm);
1012 seq_puts(m, "histogram_read_sectors ");
1013 dasd_stats_array(m, data->dasd_read_secs);
1014 seq_puts(m, "histogram_read_times ");
1015 dasd_stats_array(m, data->dasd_read_times);
1016 seq_puts(m, "histogram_read_time_build_to_ssch ");
1017 dasd_stats_array(m, data->dasd_read_time1);
1018 seq_puts(m, "histogram_read_time_ssch_to_irq ");
1019 dasd_stats_array(m, data->dasd_read_time2);
1020 seq_puts(m, "histogram_read_time_irq_to_end ");
1021 dasd_stats_array(m, data->dasd_read_time3);
1022 seq_puts(m, "histogram_read_ccw_queue_length ");
1023 dasd_stats_array(m, data->dasd_read_nr_req);
1024}
1025
1026static int dasd_stats_show(struct seq_file *m, void *v)
1027{
1028 struct dasd_profile *profile;
1029 struct dasd_profile_info *data;
1030
1031 profile = m->private;
1032 spin_lock_bh(&profile->lock);
1033 data = profile->data;
1034 if (!data) {
1035 spin_unlock_bh(&profile->lock);
1036 seq_puts(m, "disabled\n");
1037 return 0;
1038 }
1039 dasd_stats_seq_print(m, data);
1040 spin_unlock_bh(&profile->lock);
1041 return 0;
1042}
1043
1044static int dasd_stats_open(struct inode *inode, struct file *file)
1045{
1046 struct dasd_profile *profile = inode->i_private;
1047 return single_open(file, dasd_stats_show, profile);
1048}
1049
1050static const struct file_operations dasd_stats_raw_fops = {
1051 .owner = THIS_MODULE,
1052 .open = dasd_stats_open,
1053 .read = seq_read,
1054 .llseek = seq_lseek,
1055 .release = single_release,
1056 .write = dasd_stats_write,
1057};
1058
1059static void dasd_profile_init(struct dasd_profile *profile,
1060 struct dentry *base_dentry)
1061{
1062 umode_t mode;
1063 struct dentry *pde;
1064
1065 if (!base_dentry)
1066 return;
1067 profile->dentry = NULL;
1068 profile->data = NULL;
1069 mode = (S_IRUSR | S_IWUSR | S_IFREG);
1070 pde = debugfs_create_file("statistics", mode, base_dentry,
1071 profile, &dasd_stats_raw_fops);
1072 if (pde && !IS_ERR(pde))
1073 profile->dentry = pde;
1074 return;
1075}
1076
1077static void dasd_profile_exit(struct dasd_profile *profile)
1078{
1079 dasd_profile_off(profile);
1080 debugfs_remove(profile->dentry);
1081 profile->dentry = NULL;
1082}
1083
1084static void dasd_statistics_removeroot(void)
1085{
1086 dasd_global_profile_level = DASD_PROFILE_OFF;
1087 dasd_profile_exit(&dasd_global_profile);
1088 debugfs_remove(dasd_debugfs_global_entry);
1089 debugfs_remove(dasd_debugfs_root_entry);
1090}
1091
1092static void dasd_statistics_createroot(void)
1093{
1094 struct dentry *pde;
1095
1096 dasd_debugfs_root_entry = NULL;
1097 pde = debugfs_create_dir("dasd", NULL);
1098 if (!pde || IS_ERR(pde))
1099 goto error;
1100 dasd_debugfs_root_entry = pde;
1101 pde = debugfs_create_dir("global", dasd_debugfs_root_entry);
1102 if (!pde || IS_ERR(pde))
1103 goto error;
1104 dasd_debugfs_global_entry = pde;
1105 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry);
1106 return;
1107
1108error:
1109 DBF_EVENT(DBF_ERR, "%s",
1110 "Creation of the dasd debugfs interface failed");
1111 dasd_statistics_removeroot();
1112 return;
1113}
1114
1115#else
1116#define dasd_profile_start(block, cqr, req) do {} while (0)
1117#define dasd_profile_end(block, cqr, req) do {} while (0)
1118
1119static void dasd_statistics_createroot(void)
1120{
1121 return;
1122}
1123
1124static void dasd_statistics_removeroot(void)
1125{
1126 return;
1127}
1128
1129int dasd_stats_generic_show(struct seq_file *m, void *v)
1130{
1131 seq_puts(m, "Statistics are not activated in this kernel\n");
1132 return 0;
1133}
1134
1135static void dasd_profile_init(struct dasd_profile *profile,
1136 struct dentry *base_dentry)
1137{
1138 return;
1139}
1140
1141static void dasd_profile_exit(struct dasd_profile *profile)
1142{
1143 return;
1144}
1145
1146int dasd_profile_on(struct dasd_profile *profile)
1147{
1148 return 0;
1149}
1150
1151#endif
1152
1153static int dasd_hosts_show(struct seq_file *m, void *v)
1154{
1155 struct dasd_device *device;
1156 int rc = -EOPNOTSUPP;
1157
1158 device = m->private;
1159 dasd_get_device(device);
1160
1161 if (device->discipline->hosts_print)
1162 rc = device->discipline->hosts_print(device, m);
1163
1164 dasd_put_device(device);
1165 return rc;
1166}
1167
1168static int dasd_hosts_open(struct inode *inode, struct file *file)
1169{
1170 struct dasd_device *device = inode->i_private;
1171
1172 return single_open(file, dasd_hosts_show, device);
1173}
1174
1175static const struct file_operations dasd_hosts_fops = {
1176 .owner = THIS_MODULE,
1177 .open = dasd_hosts_open,
1178 .read = seq_read,
1179 .llseek = seq_lseek,
1180 .release = single_release,
1181};
1182
1183static void dasd_hosts_exit(struct dasd_device *device)
1184{
1185 debugfs_remove(device->hosts_dentry);
1186 device->hosts_dentry = NULL;
1187}
1188
1189static void dasd_hosts_init(struct dentry *base_dentry,
1190 struct dasd_device *device)
1191{
1192 struct dentry *pde;
1193 umode_t mode;
1194
1195 if (!base_dentry)
1196 return;
1197
1198 mode = S_IRUSR | S_IFREG;
1199 pde = debugfs_create_file("host_access_list", mode, base_dentry,
1200 device, &dasd_hosts_fops);
1201 if (pde && !IS_ERR(pde))
1202 device->hosts_dentry = pde;
1203}
1204
1205
1206
1207
1208
1209
1210
1211
1212struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1213 int datasize,
1214 struct dasd_device *device)
1215{
1216 struct dasd_ccw_req *cqr;
1217
1218
1219 BUG_ON(datasize > PAGE_SIZE ||
1220 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1221
1222 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1223 if (cqr == NULL)
1224 return ERR_PTR(-ENOMEM);
1225 cqr->cpaddr = NULL;
1226 if (cplength > 0) {
1227 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1228 GFP_ATOMIC | GFP_DMA);
1229 if (cqr->cpaddr == NULL) {
1230 kfree(cqr);
1231 return ERR_PTR(-ENOMEM);
1232 }
1233 }
1234 cqr->data = NULL;
1235 if (datasize > 0) {
1236 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1237 if (cqr->data == NULL) {
1238 kfree(cqr->cpaddr);
1239 kfree(cqr);
1240 return ERR_PTR(-ENOMEM);
1241 }
1242 }
1243 cqr->magic = magic;
1244 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1245 dasd_get_device(device);
1246 return cqr;
1247}
1248EXPORT_SYMBOL(dasd_kmalloc_request);
1249
1250struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1251 int datasize,
1252 struct dasd_device *device)
1253{
1254 unsigned long flags;
1255 struct dasd_ccw_req *cqr;
1256 char *data;
1257 int size;
1258
1259 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1260 if (cplength > 0)
1261 size += cplength * sizeof(struct ccw1);
1262 if (datasize > 0)
1263 size += datasize;
1264 spin_lock_irqsave(&device->mem_lock, flags);
1265 cqr = (struct dasd_ccw_req *)
1266 dasd_alloc_chunk(&device->ccw_chunks, size);
1267 spin_unlock_irqrestore(&device->mem_lock, flags);
1268 if (cqr == NULL)
1269 return ERR_PTR(-ENOMEM);
1270 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1271 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1272 cqr->cpaddr = NULL;
1273 if (cplength > 0) {
1274 cqr->cpaddr = (struct ccw1 *) data;
1275 data += cplength*sizeof(struct ccw1);
1276 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1277 }
1278 cqr->data = NULL;
1279 if (datasize > 0) {
1280 cqr->data = data;
1281 memset(cqr->data, 0, datasize);
1282 }
1283 cqr->magic = magic;
1284 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1285 dasd_get_device(device);
1286 return cqr;
1287}
1288EXPORT_SYMBOL(dasd_smalloc_request);
1289
1290
1291
1292
1293
1294
1295void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1296{
1297 struct ccw1 *ccw;
1298
1299
1300 ccw = cqr->cpaddr;
1301 do {
1302 clear_normalized_cda(ccw);
1303 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1304 kfree(cqr->cpaddr);
1305 kfree(cqr->data);
1306 kfree(cqr);
1307 dasd_put_device(device);
1308}
1309EXPORT_SYMBOL(dasd_kfree_request);
1310
1311void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1312{
1313 unsigned long flags;
1314
1315 spin_lock_irqsave(&device->mem_lock, flags);
1316 dasd_free_chunk(&device->ccw_chunks, cqr);
1317 spin_unlock_irqrestore(&device->mem_lock, flags);
1318 dasd_put_device(device);
1319}
1320EXPORT_SYMBOL(dasd_sfree_request);
1321
1322
1323
1324
1325static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1326{
1327 struct dasd_device *device;
1328
1329 if (cqr == NULL)
1330 return -EINVAL;
1331 device = cqr->startdev;
1332 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1333 DBF_DEV_EVENT(DBF_WARNING, device,
1334 " dasd_ccw_req 0x%08x magic doesn't match"
1335 " discipline 0x%08x",
1336 cqr->magic,
1337 *(unsigned int *) device->discipline->name);
1338 return -EINVAL;
1339 }
1340 return 0;
1341}
1342
1343
1344
1345
1346
1347
1348
1349int dasd_term_IO(struct dasd_ccw_req *cqr)
1350{
1351 struct dasd_device *device;
1352 int retries, rc;
1353 char errorstring[ERRORLENGTH];
1354
1355
1356 rc = dasd_check_cqr(cqr);
1357 if (rc)
1358 return rc;
1359 retries = 0;
1360 device = (struct dasd_device *) cqr->startdev;
1361 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1362 rc = ccw_device_clear(device->cdev, (long) cqr);
1363 switch (rc) {
1364 case 0:
1365 cqr->status = DASD_CQR_CLEAR_PENDING;
1366 cqr->stopclk = get_tod_clock();
1367 cqr->starttime = 0;
1368 DBF_DEV_EVENT(DBF_DEBUG, device,
1369 "terminate cqr %p successful",
1370 cqr);
1371 break;
1372 case -ENODEV:
1373 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1374 "device gone, retry");
1375 break;
1376 case -EIO:
1377 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1378 "I/O error, retry");
1379 break;
1380 case -EINVAL:
1381
1382
1383
1384
1385 cqr->status = DASD_CQR_CLEARED;
1386 cqr->stopclk = get_tod_clock();
1387 cqr->starttime = 0;
1388
1389 cqr->retries = -1;
1390 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1391 "EINVAL, handle as terminated");
1392
1393 rc = 0;
1394 break;
1395 case -EBUSY:
1396 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1397 "device busy, retry later");
1398 break;
1399 default:
1400
1401 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1402 dev_err(&device->cdev->dev, "An error occurred in the "
1403 "DASD device driver, reason=%s\n", errorstring);
1404 BUG();
1405 break;
1406 }
1407 retries++;
1408 }
1409 dasd_schedule_device_bh(device);
1410 return rc;
1411}
1412EXPORT_SYMBOL(dasd_term_IO);
1413
1414
1415
1416
1417
1418int dasd_start_IO(struct dasd_ccw_req *cqr)
1419{
1420 struct dasd_device *device;
1421 int rc;
1422 char errorstring[ERRORLENGTH];
1423
1424
1425 rc = dasd_check_cqr(cqr);
1426 if (rc) {
1427 cqr->intrc = rc;
1428 return rc;
1429 }
1430 device = (struct dasd_device *) cqr->startdev;
1431 if (((cqr->block &&
1432 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1433 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1434 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1435 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1436 "because of stolen lock", cqr);
1437 cqr->status = DASD_CQR_ERROR;
1438 cqr->intrc = -EPERM;
1439 return -EPERM;
1440 }
1441 if (cqr->retries < 0) {
1442
1443 sprintf(errorstring, "14 %p", cqr);
1444 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1445 "device driver, reason=%s\n", errorstring);
1446 cqr->status = DASD_CQR_ERROR;
1447 return -EIO;
1448 }
1449 cqr->startclk = get_tod_clock();
1450 cqr->starttime = jiffies;
1451 cqr->retries--;
1452 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1453 cqr->lpm &= dasd_path_get_opm(device);
1454 if (!cqr->lpm)
1455 cqr->lpm = dasd_path_get_opm(device);
1456 }
1457 if (cqr->cpmode == 1) {
1458 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1459 (long) cqr, cqr->lpm);
1460 } else {
1461 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1462 (long) cqr, cqr->lpm, 0);
1463 }
1464 switch (rc) {
1465 case 0:
1466 cqr->status = DASD_CQR_IN_IO;
1467 break;
1468 case -EBUSY:
1469 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1470 "start_IO: device busy, retry later");
1471 break;
1472 case -ETIMEDOUT:
1473 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1474 "start_IO: request timeout, retry later");
1475 break;
1476 case -EACCES:
1477
1478
1479
1480
1481
1482
1483
1484 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1485 DBF_DEV_EVENT(DBF_WARNING, device,
1486 "start_IO: selected paths gone (%x)",
1487 cqr->lpm);
1488 } else if (cqr->lpm != dasd_path_get_opm(device)) {
1489 cqr->lpm = dasd_path_get_opm(device);
1490 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1491 "start_IO: selected paths gone,"
1492 " retry on all paths");
1493 } else {
1494 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1495 "start_IO: all paths in opm gone,"
1496 " do path verification");
1497 dasd_generic_last_path_gone(device);
1498 dasd_path_no_path(device);
1499 dasd_path_set_tbvpm(device,
1500 ccw_device_get_path_mask(
1501 device->cdev));
1502 }
1503 break;
1504 case -ENODEV:
1505 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1506 "start_IO: -ENODEV device gone, retry");
1507 break;
1508 case -EIO:
1509 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1510 "start_IO: -EIO device gone, retry");
1511 break;
1512 case -EINVAL:
1513
1514 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1515 "start_IO: -EINVAL device currently "
1516 "not accessible");
1517 break;
1518 default:
1519
1520 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1521 dev_err(&device->cdev->dev,
1522 "An error occurred in the DASD device driver, "
1523 "reason=%s\n", errorstring);
1524 BUG();
1525 break;
1526 }
1527 cqr->intrc = rc;
1528 return rc;
1529}
1530EXPORT_SYMBOL(dasd_start_IO);
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540static void dasd_device_timeout(unsigned long ptr)
1541{
1542 unsigned long flags;
1543 struct dasd_device *device;
1544
1545 device = (struct dasd_device *) ptr;
1546 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1547
1548 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1549 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1550 dasd_schedule_device_bh(device);
1551}
1552
1553
1554
1555
1556void dasd_device_set_timer(struct dasd_device *device, int expires)
1557{
1558 if (expires == 0)
1559 del_timer(&device->timer);
1560 else
1561 mod_timer(&device->timer, jiffies + expires);
1562}
1563EXPORT_SYMBOL(dasd_device_set_timer);
1564
1565
1566
1567
1568void dasd_device_clear_timer(struct dasd_device *device)
1569{
1570 del_timer(&device->timer);
1571}
1572EXPORT_SYMBOL(dasd_device_clear_timer);
1573
1574static void dasd_handle_killed_request(struct ccw_device *cdev,
1575 unsigned long intparm)
1576{
1577 struct dasd_ccw_req *cqr;
1578 struct dasd_device *device;
1579
1580 if (!intparm)
1581 return;
1582 cqr = (struct dasd_ccw_req *) intparm;
1583 if (cqr->status != DASD_CQR_IN_IO) {
1584 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1585 "invalid status in handle_killed_request: "
1586 "%02x", cqr->status);
1587 return;
1588 }
1589
1590 device = dasd_device_from_cdev_locked(cdev);
1591 if (IS_ERR(device)) {
1592 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1593 "unable to get device from cdev");
1594 return;
1595 }
1596
1597 if (!cqr->startdev ||
1598 device != cqr->startdev ||
1599 strncmp(cqr->startdev->discipline->ebcname,
1600 (char *) &cqr->magic, 4)) {
1601 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1602 "invalid device in request");
1603 dasd_put_device(device);
1604 return;
1605 }
1606
1607
1608 cqr->status = DASD_CQR_QUEUED;
1609
1610 dasd_device_clear_timer(device);
1611 dasd_schedule_device_bh(device);
1612 dasd_put_device(device);
1613}
1614
1615void dasd_generic_handle_state_change(struct dasd_device *device)
1616{
1617
1618 dasd_eer_snss(device);
1619
1620 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1621 dasd_schedule_device_bh(device);
1622 if (device->block)
1623 dasd_schedule_block_bh(device->block);
1624}
1625EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1626
1627static int dasd_check_hpf_error(struct irb *irb)
1628{
1629 return (scsw_tm_is_valid_schxs(&irb->scsw) &&
1630 (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX ||
1631 irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX));
1632}
1633
1634
1635
1636
1637void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1638 struct irb *irb)
1639{
1640 struct dasd_ccw_req *cqr, *next;
1641 struct dasd_device *device;
1642 unsigned long long now;
1643 int nrf_suppressed = 0;
1644 int fp_suppressed = 0;
1645 u8 *sense = NULL;
1646 int expires;
1647
1648 cqr = (struct dasd_ccw_req *) intparm;
1649 if (IS_ERR(irb)) {
1650 switch (PTR_ERR(irb)) {
1651 case -EIO:
1652 if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
1653 device = cqr->startdev;
1654 cqr->status = DASD_CQR_CLEARED;
1655 dasd_device_clear_timer(device);
1656 wake_up(&dasd_flush_wq);
1657 dasd_schedule_device_bh(device);
1658 return;
1659 }
1660 break;
1661 case -ETIMEDOUT:
1662 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1663 "request timed out\n", __func__);
1664 break;
1665 default:
1666 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1667 "unknown error %ld\n", __func__,
1668 PTR_ERR(irb));
1669 }
1670 dasd_handle_killed_request(cdev, intparm);
1671 return;
1672 }
1673
1674 now = get_tod_clock();
1675
1676 if (!cqr ||
1677 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1678 scsw_cstat(&irb->scsw) == 0)) {
1679 if (cqr)
1680 memcpy(&cqr->irb, irb, sizeof(*irb));
1681 device = dasd_device_from_cdev_locked(cdev);
1682 if (IS_ERR(device))
1683 return;
1684
1685 if (device->discipline == dasd_diag_discipline_pointer) {
1686 dasd_put_device(device);
1687 return;
1688 }
1689
1690
1691
1692
1693
1694
1695
1696 sense = dasd_get_sense(irb);
1697 if (sense) {
1698 fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
1699 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
1700 nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
1701 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
1702 }
1703 if (!(fp_suppressed || nrf_suppressed))
1704 device->discipline->dump_sense_dbf(device, irb, "int");
1705
1706 if (device->features & DASD_FEATURE_ERPLOG)
1707 device->discipline->dump_sense(device, cqr, irb);
1708 device->discipline->check_for_device_change(device, cqr, irb);
1709 dasd_put_device(device);
1710 }
1711
1712
1713 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1714 device = dasd_device_from_cdev_locked(cdev);
1715 if (!IS_ERR(device)) {
1716 device->discipline->check_attention(device,
1717 irb->esw.esw1.lpum);
1718 dasd_put_device(device);
1719 }
1720 }
1721
1722 if (!cqr)
1723 return;
1724
1725 device = (struct dasd_device *) cqr->startdev;
1726 if (!device ||
1727 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1728 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1729 "invalid device in request");
1730 return;
1731 }
1732
1733
1734 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1735 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1736 cqr->status = DASD_CQR_CLEARED;
1737 dasd_device_clear_timer(device);
1738 wake_up(&dasd_flush_wq);
1739 dasd_schedule_device_bh(device);
1740 return;
1741 }
1742
1743
1744 if (cqr->status != DASD_CQR_IN_IO) {
1745 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1746 "status %02x", dev_name(&cdev->dev), cqr->status);
1747 return;
1748 }
1749
1750 next = NULL;
1751 expires = 0;
1752 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1753 scsw_cstat(&irb->scsw) == 0) {
1754
1755 cqr->status = DASD_CQR_SUCCESS;
1756 cqr->stopclk = now;
1757
1758 if (cqr->devlist.next != &device->ccw_queue) {
1759 next = list_entry(cqr->devlist.next,
1760 struct dasd_ccw_req, devlist);
1761 }
1762 } else {
1763
1764
1765
1766
1767 if (cqr->cpmode && dasd_check_hpf_error(irb) &&
1768 device->discipline->handle_hpf_error)
1769 device->discipline->handle_hpf_error(device, irb);
1770
1771
1772
1773
1774 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1775 cqr->retries > 0) {
1776 if (cqr->lpm == dasd_path_get_opm(device))
1777 DBF_DEV_EVENT(DBF_DEBUG, device,
1778 "default ERP in fastpath "
1779 "(%i retries left)",
1780 cqr->retries);
1781 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1782 cqr->lpm = dasd_path_get_opm(device);
1783 cqr->status = DASD_CQR_QUEUED;
1784 next = cqr;
1785 } else
1786 cqr->status = DASD_CQR_ERROR;
1787 }
1788 if (next && (next->status == DASD_CQR_QUEUED) &&
1789 (!device->stopped)) {
1790 if (device->discipline->start_IO(next) == 0)
1791 expires = next->expires;
1792 }
1793 if (expires != 0)
1794 dasd_device_set_timer(device, expires);
1795 else
1796 dasd_device_clear_timer(device);
1797 dasd_schedule_device_bh(device);
1798}
1799EXPORT_SYMBOL(dasd_int_handler);
1800
1801enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1802{
1803 struct dasd_device *device;
1804
1805 device = dasd_device_from_cdev_locked(cdev);
1806
1807 if (IS_ERR(device))
1808 goto out;
1809 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1810 device->state != device->target ||
1811 !device->discipline->check_for_device_change){
1812 dasd_put_device(device);
1813 goto out;
1814 }
1815 if (device->discipline->dump_sense_dbf)
1816 device->discipline->dump_sense_dbf(device, irb, "uc");
1817 device->discipline->check_for_device_change(device, NULL, irb);
1818 dasd_put_device(device);
1819out:
1820 return UC_TODO_RETRY;
1821}
1822EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1823
1824
1825
1826
1827
1828static void __dasd_device_recovery(struct dasd_device *device,
1829 struct dasd_ccw_req *ref_cqr)
1830{
1831 struct list_head *l, *n;
1832 struct dasd_ccw_req *cqr;
1833
1834
1835
1836
1837 if (!ref_cqr->block)
1838 return;
1839
1840 list_for_each_safe(l, n, &device->ccw_queue) {
1841 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1842 if (cqr->status == DASD_CQR_QUEUED &&
1843 ref_cqr->block == cqr->block) {
1844 cqr->status = DASD_CQR_CLEARED;
1845 }
1846 }
1847};
1848
1849
1850
1851
1852
1853static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1854 struct list_head *final_queue)
1855{
1856 struct list_head *l, *n;
1857 struct dasd_ccw_req *cqr;
1858
1859
1860 list_for_each_safe(l, n, &device->ccw_queue) {
1861 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1862
1863
1864 if (cqr->status == DASD_CQR_QUEUED ||
1865 cqr->status == DASD_CQR_IN_IO ||
1866 cqr->status == DASD_CQR_CLEAR_PENDING)
1867 continue;
1868 if (cqr->status == DASD_CQR_ERROR) {
1869 __dasd_device_recovery(device, cqr);
1870 }
1871
1872 list_move_tail(&cqr->devlist, final_queue);
1873 }
1874}
1875
1876
1877
1878
1879
1880static void __dasd_device_process_final_queue(struct dasd_device *device,
1881 struct list_head *final_queue)
1882{
1883 struct list_head *l, *n;
1884 struct dasd_ccw_req *cqr;
1885 struct dasd_block *block;
1886 void (*callback)(struct dasd_ccw_req *, void *data);
1887 void *callback_data;
1888 char errorstring[ERRORLENGTH];
1889
1890 list_for_each_safe(l, n, final_queue) {
1891 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1892 list_del_init(&cqr->devlist);
1893 block = cqr->block;
1894 callback = cqr->callback;
1895 callback_data = cqr->callback_data;
1896 if (block)
1897 spin_lock_bh(&block->queue_lock);
1898 switch (cqr->status) {
1899 case DASD_CQR_SUCCESS:
1900 cqr->status = DASD_CQR_DONE;
1901 break;
1902 case DASD_CQR_ERROR:
1903 cqr->status = DASD_CQR_NEED_ERP;
1904 break;
1905 case DASD_CQR_CLEARED:
1906 cqr->status = DASD_CQR_TERMINATED;
1907 break;
1908 default:
1909
1910 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1911 dev_err(&device->cdev->dev,
1912 "An error occurred in the DASD device driver, "
1913 "reason=%s\n", errorstring);
1914 BUG();
1915 }
1916 if (cqr->callback != NULL)
1917 (callback)(cqr, callback_data);
1918 if (block)
1919 spin_unlock_bh(&block->queue_lock);
1920 }
1921}
1922
1923
1924
1925
1926
1927static void __dasd_device_check_expire(struct dasd_device *device)
1928{
1929 struct dasd_ccw_req *cqr;
1930
1931 if (list_empty(&device->ccw_queue))
1932 return;
1933 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1934 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1935 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1936 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1937
1938
1939
1940
1941 cqr->retries++;
1942 }
1943 if (device->discipline->term_IO(cqr) != 0) {
1944
1945 dev_err(&device->cdev->dev,
1946 "cqr %p timed out (%lus) but cannot be "
1947 "ended, retrying in 5 s\n",
1948 cqr, (cqr->expires/HZ));
1949 cqr->expires += 5*HZ;
1950 dasd_device_set_timer(device, 5*HZ);
1951 } else {
1952 dev_err(&device->cdev->dev,
1953 "cqr %p timed out (%lus), %i retries "
1954 "remaining\n", cqr, (cqr->expires/HZ),
1955 cqr->retries);
1956 }
1957 }
1958}
1959
1960
1961
1962
1963static int __dasd_device_is_unusable(struct dasd_device *device,
1964 struct dasd_ccw_req *cqr)
1965{
1966 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1967
1968 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
1969 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1970
1971
1972
1973
1974 return 1;
1975 }
1976 if (device->stopped) {
1977 if (device->stopped & mask) {
1978
1979 return 1;
1980 }
1981 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1982
1983
1984 return 1;
1985 }
1986
1987 }
1988 return 0;
1989}
1990
1991
1992
1993
1994
1995static void __dasd_device_start_head(struct dasd_device *device)
1996{
1997 struct dasd_ccw_req *cqr;
1998 int rc;
1999
2000 if (list_empty(&device->ccw_queue))
2001 return;
2002 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2003 if (cqr->status != DASD_CQR_QUEUED)
2004 return;
2005
2006 if (__dasd_device_is_unusable(device, cqr)) {
2007 cqr->intrc = -EAGAIN;
2008 cqr->status = DASD_CQR_CLEARED;
2009 dasd_schedule_device_bh(device);
2010 return;
2011 }
2012
2013 rc = device->discipline->start_IO(cqr);
2014 if (rc == 0)
2015 dasd_device_set_timer(device, cqr->expires);
2016 else if (rc == -EACCES) {
2017 dasd_schedule_device_bh(device);
2018 } else
2019
2020 dasd_device_set_timer(device, 50);
2021}
2022
2023static void __dasd_device_check_path_events(struct dasd_device *device)
2024{
2025 int rc;
2026
2027 if (!dasd_path_get_tbvpm(device))
2028 return;
2029
2030 if (device->stopped &
2031 ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
2032 return;
2033 rc = device->discipline->verify_path(device,
2034 dasd_path_get_tbvpm(device));
2035 if (rc)
2036 dasd_device_set_timer(device, 50);
2037 else
2038 dasd_path_clear_all_verify(device);
2039};
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051int dasd_flush_device_queue(struct dasd_device *device)
2052{
2053 struct dasd_ccw_req *cqr, *n;
2054 int rc;
2055 struct list_head flush_queue;
2056
2057 INIT_LIST_HEAD(&flush_queue);
2058 spin_lock_irq(get_ccwdev_lock(device->cdev));
2059 rc = 0;
2060 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2061
2062 switch (cqr->status) {
2063 case DASD_CQR_IN_IO:
2064 rc = device->discipline->term_IO(cqr);
2065 if (rc) {
2066
2067 dev_err(&device->cdev->dev,
2068 "Flushing the DASD request queue "
2069 "failed for request %p\n", cqr);
2070
2071 goto finished;
2072 }
2073 break;
2074 case DASD_CQR_QUEUED:
2075 cqr->stopclk = get_tod_clock();
2076 cqr->status = DASD_CQR_CLEARED;
2077 break;
2078 default:
2079 break;
2080 }
2081 list_move_tail(&cqr->devlist, &flush_queue);
2082 }
2083finished:
2084 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2085
2086
2087
2088
2089
2090 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
2091 wait_event(dasd_flush_wq,
2092 (cqr->status != DASD_CQR_CLEAR_PENDING));
2093
2094
2095
2096
2097 __dasd_device_process_final_queue(device, &flush_queue);
2098 return rc;
2099}
2100EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2101
2102
2103
2104
2105static void dasd_device_tasklet(struct dasd_device *device)
2106{
2107 struct list_head final_queue;
2108
2109 atomic_set (&device->tasklet_scheduled, 0);
2110 INIT_LIST_HEAD(&final_queue);
2111 spin_lock_irq(get_ccwdev_lock(device->cdev));
2112
2113 __dasd_device_check_expire(device);
2114
2115 __dasd_device_process_ccw_queue(device, &final_queue);
2116 __dasd_device_check_path_events(device);
2117 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2118
2119 __dasd_device_process_final_queue(device, &final_queue);
2120 spin_lock_irq(get_ccwdev_lock(device->cdev));
2121
2122 __dasd_device_start_head(device);
2123 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2124 if (waitqueue_active(&shutdown_waitq))
2125 wake_up(&shutdown_waitq);
2126 dasd_put_device(device);
2127}
2128
2129
2130
2131
2132void dasd_schedule_device_bh(struct dasd_device *device)
2133{
2134
2135 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2136 return;
2137 dasd_get_device(device);
2138 tasklet_hi_schedule(&device->tasklet);
2139}
2140EXPORT_SYMBOL(dasd_schedule_device_bh);
2141
2142void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2143{
2144 device->stopped |= bits;
2145}
2146EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2147
2148void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2149{
2150 device->stopped &= ~bits;
2151 if (!device->stopped)
2152 wake_up(&generic_waitq);
2153}
2154EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2155
2156
2157
2158
2159
2160void dasd_add_request_head(struct dasd_ccw_req *cqr)
2161{
2162 struct dasd_device *device;
2163 unsigned long flags;
2164
2165 device = cqr->startdev;
2166 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2167 cqr->status = DASD_CQR_QUEUED;
2168 list_add(&cqr->devlist, &device->ccw_queue);
2169
2170 dasd_schedule_device_bh(device);
2171 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2172}
2173EXPORT_SYMBOL(dasd_add_request_head);
2174
2175
2176
2177
2178
2179void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2180{
2181 struct dasd_device *device;
2182 unsigned long flags;
2183
2184 device = cqr->startdev;
2185 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2186 cqr->status = DASD_CQR_QUEUED;
2187 list_add_tail(&cqr->devlist, &device->ccw_queue);
2188
2189 dasd_schedule_device_bh(device);
2190 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2191}
2192EXPORT_SYMBOL(dasd_add_request_tail);
2193
2194
2195
2196
2197void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2198{
2199 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2200 cqr->callback_data = DASD_SLEEPON_END_TAG;
2201 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2202 wake_up(&generic_waitq);
2203}
2204EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2205
2206static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2207{
2208 struct dasd_device *device;
2209 int rc;
2210
2211 device = cqr->startdev;
2212 spin_lock_irq(get_ccwdev_lock(device->cdev));
2213 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2214 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2215 return rc;
2216}
2217
2218
2219
2220
2221static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2222{
2223 struct dasd_device *device;
2224 dasd_erp_fn_t erp_fn;
2225
2226 if (cqr->status == DASD_CQR_FILLED)
2227 return 0;
2228 device = cqr->startdev;
2229 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2230 if (cqr->status == DASD_CQR_TERMINATED) {
2231 device->discipline->handle_terminated_request(cqr);
2232 return 1;
2233 }
2234 if (cqr->status == DASD_CQR_NEED_ERP) {
2235 erp_fn = device->discipline->erp_action(cqr);
2236 erp_fn(cqr);
2237 return 1;
2238 }
2239 if (cqr->status == DASD_CQR_FAILED)
2240 dasd_log_sense(cqr, &cqr->irb);
2241 if (cqr->refers) {
2242 __dasd_process_erp(device, cqr);
2243 return 1;
2244 }
2245 }
2246 return 0;
2247}
2248
2249static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2250{
2251 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2252 if (cqr->refers)
2253 return 1;
2254 return ((cqr->status != DASD_CQR_DONE) &&
2255 (cqr->status != DASD_CQR_FAILED));
2256 } else
2257 return (cqr->status == DASD_CQR_FILLED);
2258}
2259
2260static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2261{
2262 struct dasd_device *device;
2263 int rc;
2264 struct list_head ccw_queue;
2265 struct dasd_ccw_req *cqr;
2266
2267 INIT_LIST_HEAD(&ccw_queue);
2268 maincqr->status = DASD_CQR_FILLED;
2269 device = maincqr->startdev;
2270 list_add(&maincqr->blocklist, &ccw_queue);
2271 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2272 cqr = list_first_entry(&ccw_queue,
2273 struct dasd_ccw_req, blocklist)) {
2274
2275 if (__dasd_sleep_on_erp(cqr))
2276 continue;
2277 if (cqr->status != DASD_CQR_FILLED)
2278 continue;
2279 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2280 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2281 cqr->status = DASD_CQR_FAILED;
2282 cqr->intrc = -EPERM;
2283 continue;
2284 }
2285
2286 if (device->stopped & ~DASD_STOPPED_PENDING &&
2287 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2288 (!dasd_eer_enabled(device))) {
2289 cqr->status = DASD_CQR_FAILED;
2290 cqr->intrc = -ENOLINK;
2291 continue;
2292 }
2293
2294
2295
2296
2297 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2298 cqr->status = DASD_CQR_FAILED;
2299 cqr->intrc = -ENODEV;
2300 continue;
2301 }
2302
2303
2304
2305
2306 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2307 if (interruptible) {
2308 rc = wait_event_interruptible(
2309 generic_waitq, !(device->stopped));
2310 if (rc == -ERESTARTSYS) {
2311 cqr->status = DASD_CQR_FAILED;
2312 maincqr->intrc = rc;
2313 continue;
2314 }
2315 } else
2316 wait_event(generic_waitq, !(device->stopped));
2317 }
2318 if (!cqr->callback)
2319 cqr->callback = dasd_wakeup_cb;
2320
2321 cqr->callback_data = DASD_SLEEPON_START_TAG;
2322 dasd_add_request_tail(cqr);
2323 if (interruptible) {
2324 rc = wait_event_interruptible(
2325 generic_waitq, _wait_for_wakeup(cqr));
2326 if (rc == -ERESTARTSYS) {
2327 dasd_cancel_req(cqr);
2328
2329 wait_event(generic_waitq,
2330 _wait_for_wakeup(cqr));
2331 cqr->status = DASD_CQR_FAILED;
2332 maincqr->intrc = rc;
2333 continue;
2334 }
2335 } else
2336 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2337 }
2338
2339 maincqr->endclk = get_tod_clock();
2340 if ((maincqr->status != DASD_CQR_DONE) &&
2341 (maincqr->intrc != -ERESTARTSYS))
2342 dasd_log_sense(maincqr, &maincqr->irb);
2343 if (maincqr->status == DASD_CQR_DONE)
2344 rc = 0;
2345 else if (maincqr->intrc)
2346 rc = maincqr->intrc;
2347 else
2348 rc = -EIO;
2349 return rc;
2350}
2351
2352static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2353{
2354 struct dasd_ccw_req *cqr;
2355
2356 list_for_each_entry(cqr, ccw_queue, blocklist) {
2357 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2358 return 0;
2359 }
2360
2361 return 1;
2362}
2363
2364static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2365{
2366 struct dasd_device *device;
2367 struct dasd_ccw_req *cqr, *n;
2368 u8 *sense = NULL;
2369 int rc;
2370
2371retry:
2372 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2373 device = cqr->startdev;
2374 if (cqr->status != DASD_CQR_FILLED)
2375 continue;
2376
2377 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2378 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2379 cqr->status = DASD_CQR_FAILED;
2380 cqr->intrc = -EPERM;
2381 continue;
2382 }
2383
2384 if (device->stopped & ~DASD_STOPPED_PENDING &&
2385 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2386 !dasd_eer_enabled(device)) {
2387 cqr->status = DASD_CQR_FAILED;
2388 cqr->intrc = -EAGAIN;
2389 continue;
2390 }
2391
2392
2393 if (interruptible) {
2394 rc = wait_event_interruptible(
2395 generic_waitq, !device->stopped);
2396 if (rc == -ERESTARTSYS) {
2397 cqr->status = DASD_CQR_FAILED;
2398 cqr->intrc = rc;
2399 continue;
2400 }
2401 } else
2402 wait_event(generic_waitq, !(device->stopped));
2403
2404 if (!cqr->callback)
2405 cqr->callback = dasd_wakeup_cb;
2406 cqr->callback_data = DASD_SLEEPON_START_TAG;
2407 dasd_add_request_tail(cqr);
2408 }
2409
2410 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2411
2412 rc = 0;
2413 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2414
2415
2416
2417
2418
2419
2420 sense = dasd_get_sense(&cqr->irb);
2421 if (sense && sense[1] & SNS1_FILE_PROTECTED &&
2422 test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
2423 continue;
2424 if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
2425 test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
2426 continue;
2427
2428
2429
2430
2431
2432
2433 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2434 (cqr->status == DASD_CQR_TERMINATED ||
2435 cqr->status == DASD_CQR_NEED_ERP))
2436 return -EAGAIN;
2437
2438
2439 if (__dasd_sleep_on_erp(cqr))
2440
2441 goto retry;
2442 }
2443
2444 return 0;
2445}
2446
2447
2448
2449
2450
2451int dasd_sleep_on(struct dasd_ccw_req *cqr)
2452{
2453 return _dasd_sleep_on(cqr, 0);
2454}
2455EXPORT_SYMBOL(dasd_sleep_on);
2456
2457
2458
2459
2460int dasd_sleep_on_queue(struct list_head *ccw_queue)
2461{
2462 return _dasd_sleep_on_queue(ccw_queue, 0);
2463}
2464EXPORT_SYMBOL(dasd_sleep_on_queue);
2465
2466
2467
2468
2469
2470int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2471{
2472 return _dasd_sleep_on(cqr, 1);
2473}
2474EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2475
2476
2477
2478
2479
2480
2481
2482static inline int _dasd_term_running_cqr(struct dasd_device *device)
2483{
2484 struct dasd_ccw_req *cqr;
2485 int rc;
2486
2487 if (list_empty(&device->ccw_queue))
2488 return 0;
2489 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2490 rc = device->discipline->term_IO(cqr);
2491 if (!rc)
2492
2493
2494
2495
2496
2497 cqr->retries++;
2498 return rc;
2499}
2500
2501int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2502{
2503 struct dasd_device *device;
2504 int rc;
2505
2506 device = cqr->startdev;
2507 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2508 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2509 cqr->status = DASD_CQR_FAILED;
2510 cqr->intrc = -EPERM;
2511 return -EIO;
2512 }
2513 spin_lock_irq(get_ccwdev_lock(device->cdev));
2514 rc = _dasd_term_running_cqr(device);
2515 if (rc) {
2516 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2517 return rc;
2518 }
2519 cqr->callback = dasd_wakeup_cb;
2520 cqr->callback_data = DASD_SLEEPON_START_TAG;
2521 cqr->status = DASD_CQR_QUEUED;
2522
2523
2524
2525
2526 list_add(&cqr->devlist, device->ccw_queue.next);
2527
2528
2529 dasd_schedule_device_bh(device);
2530
2531 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2532
2533 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2534
2535 if (cqr->status == DASD_CQR_DONE)
2536 rc = 0;
2537 else if (cqr->intrc)
2538 rc = cqr->intrc;
2539 else
2540 rc = -EIO;
2541
2542
2543 dasd_schedule_device_bh(device);
2544 if (device->block)
2545 dasd_schedule_block_bh(device->block);
2546
2547 return rc;
2548}
2549EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560int dasd_cancel_req(struct dasd_ccw_req *cqr)
2561{
2562 struct dasd_device *device = cqr->startdev;
2563 unsigned long flags;
2564 int rc;
2565
2566 rc = 0;
2567 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2568 switch (cqr->status) {
2569 case DASD_CQR_QUEUED:
2570
2571 cqr->status = DASD_CQR_CLEARED;
2572 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2573 cqr->callback_data = DASD_SLEEPON_END_TAG;
2574 break;
2575 case DASD_CQR_IN_IO:
2576
2577 rc = device->discipline->term_IO(cqr);
2578 if (rc) {
2579 dev_err(&device->cdev->dev,
2580 "Cancelling request %p failed with rc=%d\n",
2581 cqr, rc);
2582 } else {
2583 cqr->stopclk = get_tod_clock();
2584 }
2585 break;
2586 default:
2587 break;
2588 }
2589 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2590 dasd_schedule_device_bh(device);
2591 return rc;
2592}
2593EXPORT_SYMBOL(dasd_cancel_req);
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604static void dasd_block_timeout(unsigned long ptr)
2605{
2606 unsigned long flags;
2607 struct dasd_block *block;
2608
2609 block = (struct dasd_block *) ptr;
2610 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2611
2612 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2613 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2614 dasd_schedule_block_bh(block);
2615}
2616
2617
2618
2619
2620void dasd_block_set_timer(struct dasd_block *block, int expires)
2621{
2622 if (expires == 0)
2623 del_timer(&block->timer);
2624 else
2625 mod_timer(&block->timer, jiffies + expires);
2626}
2627EXPORT_SYMBOL(dasd_block_set_timer);
2628
2629
2630
2631
2632void dasd_block_clear_timer(struct dasd_block *block)
2633{
2634 del_timer(&block->timer);
2635}
2636EXPORT_SYMBOL(dasd_block_clear_timer);
2637
2638
2639
2640
2641static void __dasd_process_erp(struct dasd_device *device,
2642 struct dasd_ccw_req *cqr)
2643{
2644 dasd_erp_fn_t erp_fn;
2645
2646 if (cqr->status == DASD_CQR_DONE)
2647 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2648 else
2649 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2650 erp_fn = device->discipline->erp_postaction(cqr);
2651 erp_fn(cqr);
2652}
2653
2654
2655
2656
2657static void __dasd_process_request_queue(struct dasd_block *block)
2658{
2659 struct request_queue *queue;
2660 struct request *req;
2661 struct dasd_ccw_req *cqr;
2662 struct dasd_device *basedev;
2663 unsigned long flags;
2664 queue = block->request_queue;
2665 basedev = block->base;
2666
2667 if (queue == NULL)
2668 return;
2669
2670
2671
2672
2673
2674
2675
2676
2677 if (basedev->state < DASD_STATE_READY) {
2678 while ((req = blk_fetch_request(block->request_queue)))
2679 __blk_end_request_all(req, BLK_STS_IOERR);
2680 return;
2681 }
2682
2683
2684
2685
2686
2687
2688 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST))
2689 return;
2690
2691
2692 while ((req = blk_peek_request(queue))) {
2693 if (basedev->features & DASD_FEATURE_READONLY &&
2694 rq_data_dir(req) == WRITE) {
2695 DBF_DEV_EVENT(DBF_ERR, basedev,
2696 "Rejecting write request %p",
2697 req);
2698 blk_start_request(req);
2699 __blk_end_request_all(req, BLK_STS_IOERR);
2700 continue;
2701 }
2702 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2703 (basedev->features & DASD_FEATURE_FAILFAST ||
2704 blk_noretry_request(req))) {
2705 DBF_DEV_EVENT(DBF_ERR, basedev,
2706 "Rejecting failfast request %p",
2707 req);
2708 blk_start_request(req);
2709 __blk_end_request_all(req, BLK_STS_TIMEOUT);
2710 continue;
2711 }
2712 cqr = basedev->discipline->build_cp(basedev, block, req);
2713 if (IS_ERR(cqr)) {
2714 if (PTR_ERR(cqr) == -EBUSY)
2715 break;
2716 if (PTR_ERR(cqr) == -ENOMEM)
2717 break;
2718 if (PTR_ERR(cqr) == -EAGAIN) {
2719
2720
2721
2722
2723
2724
2725 if (!list_empty(&block->ccw_queue))
2726 break;
2727 spin_lock_irqsave(
2728 get_ccwdev_lock(basedev->cdev), flags);
2729 dasd_device_set_stop_bits(basedev,
2730 DASD_STOPPED_PENDING);
2731 spin_unlock_irqrestore(
2732 get_ccwdev_lock(basedev->cdev), flags);
2733 dasd_block_set_timer(block, HZ/2);
2734 break;
2735 }
2736 DBF_DEV_EVENT(DBF_ERR, basedev,
2737 "CCW creation failed (rc=%ld) "
2738 "on request %p",
2739 PTR_ERR(cqr), req);
2740 blk_start_request(req);
2741 __blk_end_request_all(req, BLK_STS_IOERR);
2742 continue;
2743 }
2744
2745
2746
2747
2748 cqr->callback_data = (void *) req;
2749 cqr->status = DASD_CQR_FILLED;
2750 req->completion_data = cqr;
2751 blk_start_request(req);
2752 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2753 INIT_LIST_HEAD(&cqr->devlist);
2754 dasd_profile_start(block, cqr, req);
2755 }
2756}
2757
2758static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2759{
2760 struct request *req;
2761 int status;
2762 blk_status_t error = BLK_STS_OK;
2763
2764 req = (struct request *) cqr->callback_data;
2765 dasd_profile_end(cqr->block, cqr, req);
2766
2767 status = cqr->block->base->discipline->free_cp(cqr, req);
2768 if (status < 0)
2769 error = errno_to_blk_status(status);
2770 else if (status == 0) {
2771 switch (cqr->intrc) {
2772 case -EPERM:
2773 error = BLK_STS_NEXUS;
2774 break;
2775 case -ENOLINK:
2776 error = BLK_STS_TRANSPORT;
2777 break;
2778 case -ETIMEDOUT:
2779 error = BLK_STS_TIMEOUT;
2780 break;
2781 default:
2782 error = BLK_STS_IOERR;
2783 break;
2784 }
2785 }
2786 __blk_end_request_all(req, error);
2787}
2788
2789
2790
2791
2792static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2793 struct list_head *final_queue)
2794{
2795 struct list_head *l, *n;
2796 struct dasd_ccw_req *cqr;
2797 dasd_erp_fn_t erp_fn;
2798 unsigned long flags;
2799 struct dasd_device *base = block->base;
2800
2801restart:
2802
2803 list_for_each_safe(l, n, &block->ccw_queue) {
2804 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2805 if (cqr->status != DASD_CQR_DONE &&
2806 cqr->status != DASD_CQR_FAILED &&
2807 cqr->status != DASD_CQR_NEED_ERP &&
2808 cqr->status != DASD_CQR_TERMINATED)
2809 continue;
2810
2811 if (cqr->status == DASD_CQR_TERMINATED) {
2812 base->discipline->handle_terminated_request(cqr);
2813 goto restart;
2814 }
2815
2816
2817 if (cqr->status == DASD_CQR_NEED_ERP) {
2818 erp_fn = base->discipline->erp_action(cqr);
2819 if (IS_ERR(erp_fn(cqr)))
2820 continue;
2821 goto restart;
2822 }
2823
2824
2825 if (cqr->status == DASD_CQR_FAILED) {
2826 dasd_log_sense(cqr, &cqr->irb);
2827 }
2828
2829
2830 if (dasd_eer_enabled(base) &&
2831 cqr->status == DASD_CQR_FAILED) {
2832 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2833
2834
2835 cqr->status = DASD_CQR_FILLED;
2836 cqr->retries = 255;
2837 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2838 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2839 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2840 flags);
2841 goto restart;
2842 }
2843
2844
2845 if (cqr->refers) {
2846 __dasd_process_erp(base, cqr);
2847 goto restart;
2848 }
2849
2850
2851 cqr->endclk = get_tod_clock();
2852 list_move_tail(&cqr->blocklist, final_queue);
2853 }
2854}
2855
2856static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2857{
2858 dasd_schedule_block_bh(cqr->block);
2859}
2860
2861static void __dasd_block_start_head(struct dasd_block *block)
2862{
2863 struct dasd_ccw_req *cqr;
2864
2865 if (list_empty(&block->ccw_queue))
2866 return;
2867
2868
2869
2870
2871 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2872 if (cqr->status != DASD_CQR_FILLED)
2873 continue;
2874 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2875 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2876 cqr->status = DASD_CQR_FAILED;
2877 cqr->intrc = -EPERM;
2878 dasd_schedule_block_bh(block);
2879 continue;
2880 }
2881
2882 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2883 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2884 (!dasd_eer_enabled(block->base))) {
2885 cqr->status = DASD_CQR_FAILED;
2886 cqr->intrc = -ENOLINK;
2887 dasd_schedule_block_bh(block);
2888 continue;
2889 }
2890
2891 if (block->base->stopped)
2892 return;
2893
2894
2895 if (!cqr->startdev)
2896 cqr->startdev = block->base;
2897
2898
2899 cqr->callback = dasd_return_cqr_cb;
2900
2901 dasd_add_request_tail(cqr);
2902 }
2903}
2904
2905
2906
2907
2908
2909
2910static void dasd_block_tasklet(struct dasd_block *block)
2911{
2912 struct list_head final_queue;
2913 struct list_head *l, *n;
2914 struct dasd_ccw_req *cqr;
2915
2916 atomic_set(&block->tasklet_scheduled, 0);
2917 INIT_LIST_HEAD(&final_queue);
2918 spin_lock(&block->queue_lock);
2919
2920 __dasd_process_block_ccw_queue(block, &final_queue);
2921 spin_unlock(&block->queue_lock);
2922
2923 spin_lock_irq(&block->request_queue_lock);
2924 list_for_each_safe(l, n, &final_queue) {
2925 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2926 list_del_init(&cqr->blocklist);
2927 __dasd_cleanup_cqr(cqr);
2928 }
2929 spin_lock(&block->queue_lock);
2930
2931 __dasd_process_request_queue(block);
2932
2933 __dasd_block_start_head(block);
2934 spin_unlock(&block->queue_lock);
2935 spin_unlock_irq(&block->request_queue_lock);
2936 if (waitqueue_active(&shutdown_waitq))
2937 wake_up(&shutdown_waitq);
2938 dasd_put_device(block->base);
2939}
2940
2941static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2942{
2943 wake_up(&dasd_flush_wq);
2944}
2945
2946
2947
2948
2949
2950static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2951{
2952 struct dasd_block *block = cqr->block;
2953 struct request *req;
2954 unsigned long flags;
2955
2956 if (!block)
2957 return -EINVAL;
2958 spin_lock_irqsave(&block->request_queue_lock, flags);
2959 req = (struct request *) cqr->callback_data;
2960 blk_requeue_request(block->request_queue, req);
2961 spin_unlock_irqrestore(&block->request_queue_lock, flags);
2962
2963 return 0;
2964}
2965
2966
2967
2968
2969
2970
2971static int dasd_flush_block_queue(struct dasd_block *block)
2972{
2973 struct dasd_ccw_req *cqr, *n;
2974 int rc, i;
2975 struct list_head flush_queue;
2976
2977 INIT_LIST_HEAD(&flush_queue);
2978 spin_lock_bh(&block->queue_lock);
2979 rc = 0;
2980restart:
2981 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2982
2983 if (cqr->status >= DASD_CQR_QUEUED)
2984 rc = dasd_cancel_req(cqr);
2985 if (rc < 0)
2986 break;
2987
2988
2989
2990
2991
2992 cqr->callback = _dasd_wake_block_flush_cb;
2993 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2994 list_move_tail(&cqr->blocklist, &flush_queue);
2995 if (i > 1)
2996
2997 goto restart;
2998 }
2999 spin_unlock_bh(&block->queue_lock);
3000
3001restart_cb:
3002 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
3003 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
3004
3005 if (cqr->refers) {
3006 spin_lock_bh(&block->queue_lock);
3007 __dasd_process_erp(block->base, cqr);
3008 spin_unlock_bh(&block->queue_lock);
3009
3010
3011 goto restart_cb;
3012 }
3013
3014 spin_lock_irq(&block->request_queue_lock);
3015 cqr->endclk = get_tod_clock();
3016 list_del_init(&cqr->blocklist);
3017 __dasd_cleanup_cqr(cqr);
3018 spin_unlock_irq(&block->request_queue_lock);
3019 }
3020 return rc;
3021}
3022
3023
3024
3025
3026void dasd_schedule_block_bh(struct dasd_block *block)
3027{
3028
3029 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
3030 return;
3031
3032 dasd_get_device(block->base);
3033 tasklet_hi_schedule(&block->tasklet);
3034}
3035EXPORT_SYMBOL(dasd_schedule_block_bh);
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046static void do_dasd_request(struct request_queue *queue)
3047{
3048 struct dasd_block *block;
3049
3050 block = queue->queuedata;
3051 spin_lock(&block->queue_lock);
3052
3053 __dasd_process_request_queue(block);
3054
3055 __dasd_block_start_head(block);
3056 spin_unlock(&block->queue_lock);
3057}
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069enum blk_eh_timer_return dasd_times_out(struct request *req)
3070{
3071 struct dasd_ccw_req *cqr = req->completion_data;
3072 struct dasd_block *block = req->q->queuedata;
3073 struct dasd_device *device;
3074 int rc = 0;
3075
3076 if (!cqr)
3077 return BLK_EH_NOT_HANDLED;
3078
3079 device = cqr->startdev ? cqr->startdev : block->base;
3080 if (!device->blk_timeout)
3081 return BLK_EH_RESET_TIMER;
3082 DBF_DEV_EVENT(DBF_WARNING, device,
3083 " dasd_times_out cqr %p status %x",
3084 cqr, cqr->status);
3085
3086 spin_lock(&block->queue_lock);
3087 spin_lock(get_ccwdev_lock(device->cdev));
3088 cqr->retries = -1;
3089 cqr->intrc = -ETIMEDOUT;
3090 if (cqr->status >= DASD_CQR_QUEUED) {
3091 spin_unlock(get_ccwdev_lock(device->cdev));
3092 rc = dasd_cancel_req(cqr);
3093 } else if (cqr->status == DASD_CQR_FILLED ||
3094 cqr->status == DASD_CQR_NEED_ERP) {
3095 cqr->status = DASD_CQR_TERMINATED;
3096 spin_unlock(get_ccwdev_lock(device->cdev));
3097 } else if (cqr->status == DASD_CQR_IN_ERP) {
3098 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
3099
3100 list_for_each_entry_safe(searchcqr, nextcqr,
3101 &block->ccw_queue, blocklist) {
3102 tmpcqr = searchcqr;
3103 while (tmpcqr->refers)
3104 tmpcqr = tmpcqr->refers;
3105 if (tmpcqr != cqr)
3106 continue;
3107
3108 searchcqr->retries = -1;
3109 searchcqr->intrc = -ETIMEDOUT;
3110 if (searchcqr->status >= DASD_CQR_QUEUED) {
3111 spin_unlock(get_ccwdev_lock(device->cdev));
3112 rc = dasd_cancel_req(searchcqr);
3113 spin_lock(get_ccwdev_lock(device->cdev));
3114 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
3115 (searchcqr->status == DASD_CQR_NEED_ERP)) {
3116 searchcqr->status = DASD_CQR_TERMINATED;
3117 rc = 0;
3118 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
3119
3120
3121
3122
3123 continue;
3124 }
3125 break;
3126 }
3127 spin_unlock(get_ccwdev_lock(device->cdev));
3128 }
3129 dasd_schedule_block_bh(block);
3130 spin_unlock(&block->queue_lock);
3131
3132 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
3133}
3134
3135
3136
3137
3138static int dasd_alloc_queue(struct dasd_block *block)
3139{
3140 block->request_queue = blk_init_queue(do_dasd_request,
3141 &block->request_queue_lock);
3142 if (block->request_queue == NULL)
3143 return -ENOMEM;
3144
3145 block->request_queue->queuedata = block;
3146
3147 return 0;
3148}
3149
3150
3151
3152
3153static void dasd_setup_queue(struct dasd_block *block)
3154{
3155 struct request_queue *q = block->request_queue;
3156 int max;
3157
3158 if (block->base->features & DASD_FEATURE_USERAW) {
3159
3160
3161
3162
3163
3164
3165
3166 max = 2048;
3167 } else {
3168 max = block->base->discipline->max_blocks << block->s2b_shift;
3169 }
3170 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
3171 q->limits.max_dev_sectors = max;
3172 blk_queue_logical_block_size(q, block->bp_block);
3173 blk_queue_max_hw_sectors(q, max);
3174 blk_queue_max_segments(q, USHRT_MAX);
3175
3176
3177
3178 blk_queue_max_segment_size(q, PAGE_SIZE);
3179 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
3180}
3181
3182
3183
3184
3185static void dasd_free_queue(struct dasd_block *block)
3186{
3187 if (block->request_queue) {
3188 blk_cleanup_queue(block->request_queue);
3189 block->request_queue = NULL;
3190 }
3191}
3192
3193
3194
3195
3196static void dasd_flush_request_queue(struct dasd_block *block)
3197{
3198 struct request *req;
3199
3200 if (!block->request_queue)
3201 return;
3202
3203 spin_lock_irq(&block->request_queue_lock);
3204 while ((req = blk_fetch_request(block->request_queue)))
3205 __blk_end_request_all(req, BLK_STS_IOERR);
3206 spin_unlock_irq(&block->request_queue_lock);
3207}
3208
3209static int dasd_open(struct block_device *bdev, fmode_t mode)
3210{
3211 struct dasd_device *base;
3212 int rc;
3213
3214 base = dasd_device_from_gendisk(bdev->bd_disk);
3215 if (!base)
3216 return -ENODEV;
3217
3218 atomic_inc(&base->block->open_count);
3219 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3220 rc = -ENODEV;
3221 goto unlock;
3222 }
3223
3224 if (!try_module_get(base->discipline->owner)) {
3225 rc = -EINVAL;
3226 goto unlock;
3227 }
3228
3229 if (dasd_probeonly) {
3230 dev_info(&base->cdev->dev,
3231 "Accessing the DASD failed because it is in "
3232 "probeonly mode\n");
3233 rc = -EPERM;
3234 goto out;
3235 }
3236
3237 if (base->state <= DASD_STATE_BASIC) {
3238 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3239 " Cannot open unrecognized device");
3240 rc = -ENODEV;
3241 goto out;
3242 }
3243
3244 if ((mode & FMODE_WRITE) &&
3245 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3246 (base->features & DASD_FEATURE_READONLY))) {
3247 rc = -EROFS;
3248 goto out;
3249 }
3250
3251 dasd_put_device(base);
3252 return 0;
3253
3254out:
3255 module_put(base->discipline->owner);
3256unlock:
3257 atomic_dec(&base->block->open_count);
3258 dasd_put_device(base);
3259 return rc;
3260}
3261
3262static void dasd_release(struct gendisk *disk, fmode_t mode)
3263{
3264 struct dasd_device *base = dasd_device_from_gendisk(disk);
3265 if (base) {
3266 atomic_dec(&base->block->open_count);
3267 module_put(base->discipline->owner);
3268 dasd_put_device(base);
3269 }
3270}
3271
3272
3273
3274
3275static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3276{
3277 struct dasd_device *base;
3278
3279 base = dasd_device_from_gendisk(bdev->bd_disk);
3280 if (!base)
3281 return -ENODEV;
3282
3283 if (!base->discipline ||
3284 !base->discipline->fill_geometry) {
3285 dasd_put_device(base);
3286 return -EINVAL;
3287 }
3288 base->discipline->fill_geometry(base->block, geo);
3289 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3290 dasd_put_device(base);
3291 return 0;
3292}
3293
3294const struct block_device_operations
3295dasd_device_operations = {
3296 .owner = THIS_MODULE,
3297 .open = dasd_open,
3298 .release = dasd_release,
3299 .ioctl = dasd_ioctl,
3300 .compat_ioctl = dasd_ioctl,
3301 .getgeo = dasd_getgeo,
3302};
3303
3304
3305
3306
3307
3308static void
3309dasd_exit(void)
3310{
3311#ifdef CONFIG_PROC_FS
3312 dasd_proc_exit();
3313#endif
3314 dasd_eer_exit();
3315 if (dasd_page_cache != NULL) {
3316 kmem_cache_destroy(dasd_page_cache);
3317 dasd_page_cache = NULL;
3318 }
3319 dasd_gendisk_exit();
3320 dasd_devmap_exit();
3321 if (dasd_debug_area != NULL) {
3322 debug_unregister(dasd_debug_area);
3323 dasd_debug_area = NULL;
3324 }
3325 dasd_statistics_removeroot();
3326}
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337int dasd_device_is_ro(struct dasd_device *device)
3338{
3339 struct ccw_dev_id dev_id;
3340 struct diag210 diag_data;
3341 int rc;
3342
3343 if (!MACHINE_IS_VM)
3344 return 0;
3345 ccw_device_get_id(device->cdev, &dev_id);
3346 memset(&diag_data, 0, sizeof(diag_data));
3347 diag_data.vrdcdvno = dev_id.devno;
3348 diag_data.vrdclen = sizeof(diag_data);
3349 rc = diag210(&diag_data);
3350 if (rc == 0 || rc == 2) {
3351 return diag_data.vrdcvfla & 0x80;
3352 } else {
3353 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3354 dev_id.devno, rc);
3355 return 0;
3356 }
3357}
3358EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3359
3360static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3361{
3362 struct ccw_device *cdev = data;
3363 int ret;
3364
3365 ret = ccw_device_set_online(cdev);
3366 if (ret)
3367 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3368 dev_name(&cdev->dev), ret);
3369}
3370
3371
3372
3373
3374
3375int dasd_generic_probe(struct ccw_device *cdev,
3376 struct dasd_discipline *discipline)
3377{
3378 int ret;
3379
3380 ret = dasd_add_sysfs_files(cdev);
3381 if (ret) {
3382 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3383 "dasd_generic_probe: could not add "
3384 "sysfs entries");
3385 return ret;
3386 }
3387 cdev->handler = &dasd_int_handler;
3388
3389
3390
3391
3392
3393
3394 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3395 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3396 async_schedule(dasd_generic_auto_online, cdev);
3397 return 0;
3398}
3399EXPORT_SYMBOL_GPL(dasd_generic_probe);
3400
3401void dasd_generic_free_discipline(struct dasd_device *device)
3402{
3403
3404 if (device->discipline) {
3405 if (device->discipline->uncheck_device)
3406 device->discipline->uncheck_device(device);
3407 module_put(device->discipline->owner);
3408 device->discipline = NULL;
3409 }
3410 if (device->base_discipline) {
3411 module_put(device->base_discipline->owner);
3412 device->base_discipline = NULL;
3413 }
3414}
3415EXPORT_SYMBOL_GPL(dasd_generic_free_discipline);
3416
3417
3418
3419
3420
3421void dasd_generic_remove(struct ccw_device *cdev)
3422{
3423 struct dasd_device *device;
3424 struct dasd_block *block;
3425
3426 cdev->handler = NULL;
3427
3428 device = dasd_device_from_cdev(cdev);
3429 if (IS_ERR(device)) {
3430 dasd_remove_sysfs_files(cdev);
3431 return;
3432 }
3433 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3434 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3435
3436 dasd_put_device(device);
3437 dasd_remove_sysfs_files(cdev);
3438 return;
3439 }
3440
3441
3442
3443
3444
3445 dasd_set_target_state(device, DASD_STATE_NEW);
3446
3447 block = device->block;
3448 dasd_delete_device(device);
3449
3450
3451
3452
3453 if (block)
3454 dasd_free_block(block);
3455
3456 dasd_remove_sysfs_files(cdev);
3457}
3458EXPORT_SYMBOL_GPL(dasd_generic_remove);
3459
3460
3461
3462
3463
3464
3465int dasd_generic_set_online(struct ccw_device *cdev,
3466 struct dasd_discipline *base_discipline)
3467{
3468 struct dasd_discipline *discipline;
3469 struct dasd_device *device;
3470 int rc;
3471
3472
3473 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3474 device = dasd_create_device(cdev);
3475 if (IS_ERR(device))
3476 return PTR_ERR(device);
3477
3478 discipline = base_discipline;
3479 if (device->features & DASD_FEATURE_USEDIAG) {
3480 if (!dasd_diag_discipline_pointer) {
3481
3482 rc = request_module(DASD_DIAG_MOD);
3483 if (rc) {
3484 pr_warn("%s Setting the DASD online failed "
3485 "because the required module %s "
3486 "could not be loaded (rc=%d)\n",
3487 dev_name(&cdev->dev), DASD_DIAG_MOD,
3488 rc);
3489 dasd_delete_device(device);
3490 return -ENODEV;
3491 }
3492 }
3493
3494
3495 if (!dasd_diag_discipline_pointer) {
3496 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3497 dev_name(&cdev->dev));
3498 dasd_delete_device(device);
3499 return -ENODEV;
3500 }
3501 discipline = dasd_diag_discipline_pointer;
3502 }
3503 if (!try_module_get(base_discipline->owner)) {
3504 dasd_delete_device(device);
3505 return -EINVAL;
3506 }
3507 if (!try_module_get(discipline->owner)) {
3508 module_put(base_discipline->owner);
3509 dasd_delete_device(device);
3510 return -EINVAL;
3511 }
3512 device->base_discipline = base_discipline;
3513 device->discipline = discipline;
3514
3515
3516 rc = discipline->check_device(device);
3517 if (rc) {
3518 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3519 dev_name(&cdev->dev), discipline->name, rc);
3520 module_put(discipline->owner);
3521 module_put(base_discipline->owner);
3522 dasd_delete_device(device);
3523 return rc;
3524 }
3525
3526 dasd_set_target_state(device, DASD_STATE_ONLINE);
3527 if (device->state <= DASD_STATE_KNOWN) {
3528 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3529 dev_name(&cdev->dev));
3530 rc = -ENODEV;
3531 dasd_set_target_state(device, DASD_STATE_NEW);
3532 if (device->block)
3533 dasd_free_block(device->block);
3534 dasd_delete_device(device);
3535 } else
3536 pr_debug("dasd_generic device %s found\n",
3537 dev_name(&cdev->dev));
3538
3539 wait_event(dasd_init_waitq, _wait_for_device(device));
3540
3541 dasd_put_device(device);
3542 return rc;
3543}
3544EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3545
3546int dasd_generic_set_offline(struct ccw_device *cdev)
3547{
3548 struct dasd_device *device;
3549 struct dasd_block *block;
3550 int max_count, open_count, rc;
3551 unsigned long flags;
3552
3553 rc = 0;
3554 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3555 device = dasd_device_from_cdev_locked(cdev);
3556 if (IS_ERR(device)) {
3557 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3558 return PTR_ERR(device);
3559 }
3560
3561
3562
3563
3564
3565
3566
3567 if (device->block) {
3568 max_count = device->block->bdev ? 0 : -1;
3569 open_count = atomic_read(&device->block->open_count);
3570 if (open_count > max_count) {
3571 if (open_count > 0)
3572 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3573 dev_name(&cdev->dev), open_count);
3574 else
3575 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3576 dev_name(&cdev->dev));
3577 rc = -EBUSY;
3578 goto out_err;
3579 }
3580 }
3581
3582
3583
3584
3585
3586
3587
3588 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3589 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3590 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING,
3591 &device->flags);
3592 } else {
3593 rc = -EBUSY;
3594 goto out_err;
3595 }
3596 }
3597 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3598
3599
3600
3601
3602
3603
3604 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3605 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3606
3607 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3608
3609
3610
3611
3612
3613
3614 if (device->block) {
3615 rc = fsync_bdev(device->block->bdev);
3616 if (rc != 0)
3617 goto interrupted;
3618 }
3619 dasd_schedule_device_bh(device);
3620 rc = wait_event_interruptible(shutdown_waitq,
3621 _wait_for_empty_queues(device));
3622 if (rc != 0)
3623 goto interrupted;
3624
3625
3626
3627
3628
3629
3630
3631
3632 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3633 if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3634 rc = -ERESTARTSYS;
3635 goto out_err;
3636 }
3637 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3638 }
3639 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3640
3641 dasd_set_target_state(device, DASD_STATE_NEW);
3642
3643 block = device->block;
3644 dasd_delete_device(device);
3645
3646
3647
3648
3649 if (block)
3650 dasd_free_block(block);
3651
3652 return 0;
3653
3654interrupted:
3655
3656 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
3657 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3658 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3659out_err:
3660 dasd_put_device(device);
3661 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
3662 return rc;
3663}
3664EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3665
3666int dasd_generic_last_path_gone(struct dasd_device *device)
3667{
3668 struct dasd_ccw_req *cqr;
3669
3670 dev_warn(&device->cdev->dev, "No operational channel path is left "
3671 "for the device\n");
3672 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3673
3674 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3675
3676 if (device->state < DASD_STATE_BASIC)
3677 return 0;
3678
3679 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3680 if ((cqr->status == DASD_CQR_IN_IO) ||
3681 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3682 cqr->status = DASD_CQR_QUEUED;
3683 cqr->retries++;
3684 }
3685 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3686 dasd_device_clear_timer(device);
3687 dasd_schedule_device_bh(device);
3688 return 1;
3689}
3690EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3691
3692int dasd_generic_path_operational(struct dasd_device *device)
3693{
3694 dev_info(&device->cdev->dev, "A channel path to the device has become "
3695 "operational\n");
3696 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3697 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3698 if (device->stopped & DASD_UNRESUMED_PM) {
3699 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3700 dasd_restore_device(device);
3701 return 1;
3702 }
3703 dasd_schedule_device_bh(device);
3704 if (device->block)
3705 dasd_schedule_block_bh(device->block);
3706
3707 if (!device->stopped)
3708 wake_up(&generic_waitq);
3709
3710 return 1;
3711}
3712EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3713
3714int dasd_generic_notify(struct ccw_device *cdev, int event)
3715{
3716 struct dasd_device *device;
3717 int ret;
3718
3719 device = dasd_device_from_cdev_locked(cdev);
3720 if (IS_ERR(device))
3721 return 0;
3722 ret = 0;
3723 switch (event) {
3724 case CIO_GONE:
3725 case CIO_BOXED:
3726 case CIO_NO_PATH:
3727 dasd_path_no_path(device);
3728 ret = dasd_generic_last_path_gone(device);
3729 break;
3730 case CIO_OPER:
3731 ret = 1;
3732 if (dasd_path_get_opm(device))
3733 ret = dasd_generic_path_operational(device);
3734 break;
3735 }
3736 dasd_put_device(device);
3737 return ret;
3738}
3739EXPORT_SYMBOL_GPL(dasd_generic_notify);
3740
3741void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3742{
3743 struct dasd_device *device;
3744 int chp, oldopm, hpfpm, ifccpm;
3745
3746 device = dasd_device_from_cdev_locked(cdev);
3747 if (IS_ERR(device))
3748 return;
3749
3750 oldopm = dasd_path_get_opm(device);
3751 for (chp = 0; chp < 8; chp++) {
3752 if (path_event[chp] & PE_PATH_GONE) {
3753 dasd_path_notoper(device, chp);
3754 }
3755 if (path_event[chp] & PE_PATH_AVAILABLE) {
3756 dasd_path_available(device, chp);
3757 dasd_schedule_device_bh(device);
3758 }
3759 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3760 if (!dasd_path_is_operational(device, chp) &&
3761 !dasd_path_need_verify(device, chp)) {
3762
3763
3764
3765
3766
3767 dasd_path_available(device, chp);
3768 dasd_schedule_device_bh(device);
3769 }
3770 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3771 "Pathgroup re-established\n");
3772 if (device->discipline->kick_validate)
3773 device->discipline->kick_validate(device);
3774 }
3775 }
3776 hpfpm = dasd_path_get_hpfpm(device);
3777 ifccpm = dasd_path_get_ifccpm(device);
3778 if (!dasd_path_get_opm(device) && hpfpm) {
3779
3780
3781
3782
3783
3784 if (device->discipline->disable_hpf)
3785 device->discipline->disable_hpf(device);
3786 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
3787 dasd_path_set_tbvpm(device, hpfpm);
3788 dasd_schedule_device_bh(device);
3789 dasd_schedule_requeue(device);
3790 } else if (!dasd_path_get_opm(device) && ifccpm) {
3791
3792
3793
3794
3795
3796 dasd_path_set_tbvpm(device, ifccpm);
3797 dasd_schedule_device_bh(device);
3798 }
3799 if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) {
3800 dev_warn(&device->cdev->dev,
3801 "No verified channel paths remain for the device\n");
3802 DBF_DEV_EVENT(DBF_WARNING, device,
3803 "%s", "last verified path gone");
3804 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3805 dasd_device_set_stop_bits(device,
3806 DASD_STOPPED_DC_WAIT);
3807 }
3808 dasd_put_device(device);
3809}
3810EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3811
3812int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3813{
3814 if (!dasd_path_get_opm(device) && lpm) {
3815 dasd_path_set_opm(device, lpm);
3816 dasd_generic_path_operational(device);
3817 } else
3818 dasd_path_add_opm(device, lpm);
3819 return 0;
3820}
3821EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3822
3823
3824
3825
3826static int dasd_generic_requeue_all_requests(struct dasd_device *device)
3827{
3828 struct list_head requeue_queue;
3829 struct dasd_ccw_req *cqr, *n;
3830 struct dasd_ccw_req *refers;
3831 int rc;
3832
3833 INIT_LIST_HEAD(&requeue_queue);
3834 spin_lock_irq(get_ccwdev_lock(device->cdev));
3835 rc = 0;
3836 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3837
3838 if (cqr->status == DASD_CQR_IN_IO) {
3839 rc = device->discipline->term_IO(cqr);
3840 if (rc) {
3841
3842 dev_err(&device->cdev->dev,
3843 "Unable to terminate request %p "
3844 "on suspend\n", cqr);
3845 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3846 dasd_put_device(device);
3847 return rc;
3848 }
3849 }
3850 list_move_tail(&cqr->devlist, &requeue_queue);
3851 }
3852 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3853
3854 list_for_each_entry_safe(cqr, n, &requeue_queue, devlist) {
3855 wait_event(dasd_flush_wq,
3856 (cqr->status != DASD_CQR_CLEAR_PENDING));
3857
3858
3859 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
3860 cqr->callback_data = DASD_SLEEPON_END_TAG;
3861
3862
3863 list_del_init(&cqr->devlist);
3864 while (cqr->refers != NULL) {
3865 refers = cqr->refers;
3866
3867 list_del(&cqr->blocklist);
3868
3869 dasd_free_erp_request(cqr, cqr->memdev);
3870 cqr = refers;
3871 }
3872
3873
3874
3875
3876
3877 if (_dasd_requeue_request(cqr))
3878 continue;
3879
3880 if (cqr->block)
3881 list_del_init(&cqr->blocklist);
3882 cqr->block->base->discipline->free_cp(
3883 cqr, (struct request *) cqr->callback_data);
3884 }
3885
3886
3887
3888
3889
3890 if (!list_empty(&requeue_queue)) {
3891
3892 spin_lock_irq(get_ccwdev_lock(device->cdev));
3893 list_splice_tail(&requeue_queue, &device->ccw_queue);
3894 spin_unlock_irq(get_ccwdev_lock(device->cdev));
3895 }
3896
3897 wake_up(&generic_waitq);
3898 return rc;
3899}
3900
3901static void do_requeue_requests(struct work_struct *work)
3902{
3903 struct dasd_device *device = container_of(work, struct dasd_device,
3904 requeue_requests);
3905 dasd_generic_requeue_all_requests(device);
3906 dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC);
3907 if (device->block)
3908 dasd_schedule_block_bh(device->block);
3909 dasd_put_device(device);
3910}
3911
3912void dasd_schedule_requeue(struct dasd_device *device)
3913{
3914 dasd_get_device(device);
3915
3916 if (!schedule_work(&device->requeue_requests))
3917 dasd_put_device(device);
3918}
3919EXPORT_SYMBOL(dasd_schedule_requeue);
3920
3921int dasd_generic_pm_freeze(struct ccw_device *cdev)
3922{
3923 struct dasd_device *device = dasd_device_from_cdev(cdev);
3924
3925 if (IS_ERR(device))
3926 return PTR_ERR(device);
3927
3928
3929 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3930
3931 if (device->discipline->freeze)
3932 device->discipline->freeze(device);
3933
3934
3935 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3936
3937 return dasd_generic_requeue_all_requests(device);
3938}
3939EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3940
3941int dasd_generic_restore_device(struct ccw_device *cdev)
3942{
3943 struct dasd_device *device = dasd_device_from_cdev(cdev);
3944 int rc = 0;
3945
3946 if (IS_ERR(device))
3947 return PTR_ERR(device);
3948
3949
3950 dasd_device_remove_stop_bits(device,
3951 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3952
3953 dasd_schedule_device_bh(device);
3954
3955
3956
3957
3958
3959 if (device->discipline->restore && !(device->stopped))
3960 rc = device->discipline->restore(device);
3961 if (rc || device->stopped)
3962
3963
3964
3965
3966 device->stopped |= DASD_UNRESUMED_PM;
3967
3968 if (device->block)
3969 dasd_schedule_block_bh(device->block);
3970
3971 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3972 dasd_put_device(device);
3973 return 0;
3974}
3975EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3976
3977static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3978 void *rdc_buffer,
3979 int rdc_buffer_size,
3980 int magic)
3981{
3982 struct dasd_ccw_req *cqr;
3983 struct ccw1 *ccw;
3984 unsigned long *idaw;
3985
3986 cqr = dasd_smalloc_request(magic, 1 , rdc_buffer_size, device);
3987
3988 if (IS_ERR(cqr)) {
3989
3990 dev_err(&device->cdev->dev,
3991 "An error occurred in the DASD device driver, "
3992 "reason=%s\n", "13");
3993 return cqr;
3994 }
3995
3996 ccw = cqr->cpaddr;
3997 ccw->cmd_code = CCW_CMD_RDC;
3998 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3999 idaw = (unsigned long *) (cqr->data);
4000 ccw->cda = (__u32)(addr_t) idaw;
4001 ccw->flags = CCW_FLAG_IDA;
4002 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
4003 } else {
4004 ccw->cda = (__u32)(addr_t) rdc_buffer;
4005 ccw->flags = 0;
4006 }
4007
4008 ccw->count = rdc_buffer_size;
4009 cqr->startdev = device;
4010 cqr->memdev = device;
4011 cqr->expires = 10*HZ;
4012 cqr->retries = 256;
4013 cqr->buildclk = get_tod_clock();
4014 cqr->status = DASD_CQR_FILLED;
4015 return cqr;
4016}
4017
4018
4019int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
4020 void *rdc_buffer, int rdc_buffer_size)
4021{
4022 int ret;
4023 struct dasd_ccw_req *cqr;
4024
4025 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
4026 magic);
4027 if (IS_ERR(cqr))
4028 return PTR_ERR(cqr);
4029
4030 ret = dasd_sleep_on(cqr);
4031 dasd_sfree_request(cqr, cqr->memdev);
4032 return ret;
4033}
4034EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
4035
4036
4037
4038
4039
4040
4041
4042char *dasd_get_sense(struct irb *irb)
4043{
4044 struct tsb *tsb = NULL;
4045 char *sense = NULL;
4046
4047 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
4048 if (irb->scsw.tm.tcw)
4049 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
4050 irb->scsw.tm.tcw);
4051 if (tsb && tsb->length == 64 && tsb->flags)
4052 switch (tsb->flags & 0x07) {
4053 case 1:
4054 sense = tsb->tsa.iostat.sense;
4055 break;
4056 case 2:
4057 sense = tsb->tsa.ddpc.sense;
4058 break;
4059 default:
4060
4061 break;
4062 }
4063 } else if (irb->esw.esw0.erw.cons) {
4064 sense = irb->ecw;
4065 }
4066 return sense;
4067}
4068EXPORT_SYMBOL_GPL(dasd_get_sense);
4069
4070void dasd_generic_shutdown(struct ccw_device *cdev)
4071{
4072 struct dasd_device *device;
4073
4074 device = dasd_device_from_cdev(cdev);
4075 if (IS_ERR(device))
4076 return;
4077
4078 if (device->block)
4079 dasd_schedule_block_bh(device->block);
4080
4081 dasd_schedule_device_bh(device);
4082
4083 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
4084}
4085EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
4086
4087static int __init dasd_init(void)
4088{
4089 int rc;
4090
4091 init_waitqueue_head(&dasd_init_waitq);
4092 init_waitqueue_head(&dasd_flush_wq);
4093 init_waitqueue_head(&generic_waitq);
4094 init_waitqueue_head(&shutdown_waitq);
4095
4096
4097 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
4098 if (dasd_debug_area == NULL) {
4099 rc = -ENOMEM;
4100 goto failed;
4101 }
4102 debug_register_view(dasd_debug_area, &debug_sprintf_view);
4103 debug_set_level(dasd_debug_area, DBF_WARNING);
4104
4105 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
4106
4107 dasd_diag_discipline_pointer = NULL;
4108
4109 dasd_statistics_createroot();
4110
4111 rc = dasd_devmap_init();
4112 if (rc)
4113 goto failed;
4114 rc = dasd_gendisk_init();
4115 if (rc)
4116 goto failed;
4117 rc = dasd_parse();
4118 if (rc)
4119 goto failed;
4120 rc = dasd_eer_init();
4121 if (rc)
4122 goto failed;
4123#ifdef CONFIG_PROC_FS
4124 rc = dasd_proc_init();
4125 if (rc)
4126 goto failed;
4127#endif
4128
4129 return 0;
4130failed:
4131 pr_info("The DASD device driver could not be initialized\n");
4132 dasd_exit();
4133 return rc;
4134}
4135
4136module_init(dasd_init);
4137module_exit(dasd_exit);
4138