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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 dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
73static void dasd_device_timeout(unsigned long);
74static void dasd_block_timeout(unsigned long);
75static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *);
76static void dasd_profile_init(struct dasd_profile *, struct dentry *);
77static void dasd_profile_exit(struct dasd_profile *);
78
79
80
81
82static wait_queue_head_t dasd_init_waitq;
83static wait_queue_head_t dasd_flush_wq;
84static wait_queue_head_t generic_waitq;
85static wait_queue_head_t shutdown_waitq;
86
87
88
89
90struct dasd_device *dasd_alloc_device(void)
91{
92 struct dasd_device *device;
93
94 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
95 if (!device)
96 return ERR_PTR(-ENOMEM);
97
98
99 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
100 if (!device->ccw_mem) {
101 kfree(device);
102 return ERR_PTR(-ENOMEM);
103 }
104
105 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
106 if (!device->erp_mem) {
107 free_pages((unsigned long) device->ccw_mem, 1);
108 kfree(device);
109 return ERR_PTR(-ENOMEM);
110 }
111
112 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
113 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
114 spin_lock_init(&device->mem_lock);
115 atomic_set(&device->tasklet_scheduled, 0);
116 tasklet_init(&device->tasklet,
117 (void (*)(unsigned long)) dasd_device_tasklet,
118 (unsigned long) device);
119 INIT_LIST_HEAD(&device->ccw_queue);
120 init_timer(&device->timer);
121 device->timer.function = dasd_device_timeout;
122 device->timer.data = (unsigned long) device;
123 INIT_WORK(&device->kick_work, do_kick_device);
124 INIT_WORK(&device->restore_device, do_restore_device);
125 INIT_WORK(&device->reload_device, do_reload_device);
126 device->state = DASD_STATE_NEW;
127 device->target = DASD_STATE_NEW;
128 mutex_init(&device->state_mutex);
129 spin_lock_init(&device->profile.lock);
130 return device;
131}
132
133
134
135
136void dasd_free_device(struct dasd_device *device)
137{
138 kfree(device->private);
139 free_page((unsigned long) device->erp_mem);
140 free_pages((unsigned long) device->ccw_mem, 1);
141 kfree(device);
142}
143
144
145
146
147struct dasd_block *dasd_alloc_block(void)
148{
149 struct dasd_block *block;
150
151 block = kzalloc(sizeof(*block), GFP_ATOMIC);
152 if (!block)
153 return ERR_PTR(-ENOMEM);
154
155 atomic_set(&block->open_count, -1);
156
157 spin_lock_init(&block->request_queue_lock);
158 atomic_set(&block->tasklet_scheduled, 0);
159 tasklet_init(&block->tasklet,
160 (void (*)(unsigned long)) dasd_block_tasklet,
161 (unsigned long) block);
162 INIT_LIST_HEAD(&block->ccw_queue);
163 spin_lock_init(&block->queue_lock);
164 init_timer(&block->timer);
165 block->timer.function = dasd_block_timeout;
166 block->timer.data = (unsigned long) block;
167 spin_lock_init(&block->profile.lock);
168
169 return block;
170}
171EXPORT_SYMBOL_GPL(dasd_alloc_block);
172
173
174
175
176void dasd_free_block(struct dasd_block *block)
177{
178 kfree(block);
179}
180EXPORT_SYMBOL_GPL(dasd_free_block);
181
182
183
184
185static int dasd_state_new_to_known(struct dasd_device *device)
186{
187 int rc;
188
189
190
191
192
193 dasd_get_device(device);
194
195 if (device->block) {
196 rc = dasd_alloc_queue(device->block);
197 if (rc) {
198 dasd_put_device(device);
199 return rc;
200 }
201 }
202 device->state = DASD_STATE_KNOWN;
203 return 0;
204}
205
206
207
208
209static int dasd_state_known_to_new(struct dasd_device *device)
210{
211
212 dasd_eer_disable(device);
213
214 if (device->discipline) {
215 if (device->discipline->uncheck_device)
216 device->discipline->uncheck_device(device);
217 module_put(device->discipline->owner);
218 }
219 device->discipline = NULL;
220 if (device->base_discipline)
221 module_put(device->base_discipline->owner);
222 device->base_discipline = NULL;
223 device->state = DASD_STATE_NEW;
224
225 if (device->block)
226 dasd_free_queue(device->block);
227
228
229 dasd_put_device(device);
230 return 0;
231}
232
233static struct dentry *dasd_debugfs_setup(const char *name,
234 struct dentry *base_dentry)
235{
236 struct dentry *pde;
237
238 if (!base_dentry)
239 return NULL;
240 pde = debugfs_create_dir(name, base_dentry);
241 if (!pde || IS_ERR(pde))
242 return NULL;
243 return pde;
244}
245
246
247
248
249static int dasd_state_known_to_basic(struct dasd_device *device)
250{
251 struct dasd_block *block = device->block;
252 int rc = 0;
253
254
255 if (block) {
256 rc = dasd_gendisk_alloc(block);
257 if (rc)
258 return rc;
259 block->debugfs_dentry =
260 dasd_debugfs_setup(block->gdp->disk_name,
261 dasd_debugfs_root_entry);
262 dasd_profile_init(&block->profile, block->debugfs_dentry);
263 if (dasd_global_profile_level == DASD_PROFILE_ON)
264 dasd_profile_on(&device->block->profile);
265 }
266 device->debugfs_dentry =
267 dasd_debugfs_setup(dev_name(&device->cdev->dev),
268 dasd_debugfs_root_entry);
269 dasd_profile_init(&device->profile, device->debugfs_dentry);
270
271
272 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
273 8 * sizeof(long));
274 debug_register_view(device->debug_area, &debug_sprintf_view);
275 debug_set_level(device->debug_area, DBF_WARNING);
276 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
277
278 device->state = DASD_STATE_BASIC;
279
280 return rc;
281}
282
283
284
285
286static int dasd_state_basic_to_known(struct dasd_device *device)
287{
288 int rc;
289
290 if (device->discipline->basic_to_known) {
291 rc = device->discipline->basic_to_known(device);
292 if (rc)
293 return rc;
294 }
295
296 if (device->block) {
297 dasd_profile_exit(&device->block->profile);
298 debugfs_remove(device->block->debugfs_dentry);
299 dasd_gendisk_free(device->block);
300 dasd_block_clear_timer(device->block);
301 }
302 rc = dasd_flush_device_queue(device);
303 if (rc)
304 return rc;
305 dasd_device_clear_timer(device);
306 dasd_profile_exit(&device->profile);
307 debugfs_remove(device->debugfs_dentry);
308 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
309 if (device->debug_area != NULL) {
310 debug_unregister(device->debug_area);
311 device->debug_area = NULL;
312 }
313 device->state = DASD_STATE_KNOWN;
314 return 0;
315}
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331static int dasd_state_basic_to_ready(struct dasd_device *device)
332{
333 int rc;
334 struct dasd_block *block;
335
336 rc = 0;
337 block = device->block;
338
339 if (block) {
340 if (block->base->discipline->do_analysis != NULL)
341 rc = block->base->discipline->do_analysis(block);
342 if (rc) {
343 if (rc != -EAGAIN) {
344 device->state = DASD_STATE_UNFMT;
345 goto out;
346 }
347 return rc;
348 }
349 dasd_setup_queue(block);
350 set_capacity(block->gdp,
351 block->blocks << block->s2b_shift);
352 device->state = DASD_STATE_READY;
353 rc = dasd_scan_partitions(block);
354 if (rc) {
355 device->state = DASD_STATE_BASIC;
356 return rc;
357 }
358 } else {
359 device->state = DASD_STATE_READY;
360 }
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
1153
1154
1155
1156
1157
1158
1159
1160struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
1161 int datasize,
1162 struct dasd_device *device)
1163{
1164 struct dasd_ccw_req *cqr;
1165
1166
1167 BUG_ON(datasize > PAGE_SIZE ||
1168 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
1169
1170 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
1171 if (cqr == NULL)
1172 return ERR_PTR(-ENOMEM);
1173 cqr->cpaddr = NULL;
1174 if (cplength > 0) {
1175 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
1176 GFP_ATOMIC | GFP_DMA);
1177 if (cqr->cpaddr == NULL) {
1178 kfree(cqr);
1179 return ERR_PTR(-ENOMEM);
1180 }
1181 }
1182 cqr->data = NULL;
1183 if (datasize > 0) {
1184 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
1185 if (cqr->data == NULL) {
1186 kfree(cqr->cpaddr);
1187 kfree(cqr);
1188 return ERR_PTR(-ENOMEM);
1189 }
1190 }
1191 cqr->magic = magic;
1192 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1193 dasd_get_device(device);
1194 return cqr;
1195}
1196EXPORT_SYMBOL(dasd_kmalloc_request);
1197
1198struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
1199 int datasize,
1200 struct dasd_device *device)
1201{
1202 unsigned long flags;
1203 struct dasd_ccw_req *cqr;
1204 char *data;
1205 int size;
1206
1207 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
1208 if (cplength > 0)
1209 size += cplength * sizeof(struct ccw1);
1210 if (datasize > 0)
1211 size += datasize;
1212 spin_lock_irqsave(&device->mem_lock, flags);
1213 cqr = (struct dasd_ccw_req *)
1214 dasd_alloc_chunk(&device->ccw_chunks, size);
1215 spin_unlock_irqrestore(&device->mem_lock, flags);
1216 if (cqr == NULL)
1217 return ERR_PTR(-ENOMEM);
1218 memset(cqr, 0, sizeof(struct dasd_ccw_req));
1219 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
1220 cqr->cpaddr = NULL;
1221 if (cplength > 0) {
1222 cqr->cpaddr = (struct ccw1 *) data;
1223 data += cplength*sizeof(struct ccw1);
1224 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
1225 }
1226 cqr->data = NULL;
1227 if (datasize > 0) {
1228 cqr->data = data;
1229 memset(cqr->data, 0, datasize);
1230 }
1231 cqr->magic = magic;
1232 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1233 dasd_get_device(device);
1234 return cqr;
1235}
1236EXPORT_SYMBOL(dasd_smalloc_request);
1237
1238
1239
1240
1241
1242
1243void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1244{
1245 struct ccw1 *ccw;
1246
1247
1248 ccw = cqr->cpaddr;
1249 do {
1250 clear_normalized_cda(ccw);
1251 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1252 kfree(cqr->cpaddr);
1253 kfree(cqr->data);
1254 kfree(cqr);
1255 dasd_put_device(device);
1256}
1257EXPORT_SYMBOL(dasd_kfree_request);
1258
1259void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
1260{
1261 unsigned long flags;
1262
1263 spin_lock_irqsave(&device->mem_lock, flags);
1264 dasd_free_chunk(&device->ccw_chunks, cqr);
1265 spin_unlock_irqrestore(&device->mem_lock, flags);
1266 dasd_put_device(device);
1267}
1268EXPORT_SYMBOL(dasd_sfree_request);
1269
1270
1271
1272
1273static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
1274{
1275 struct dasd_device *device;
1276
1277 if (cqr == NULL)
1278 return -EINVAL;
1279 device = cqr->startdev;
1280 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
1281 DBF_DEV_EVENT(DBF_WARNING, device,
1282 " dasd_ccw_req 0x%08x magic doesn't match"
1283 " discipline 0x%08x",
1284 cqr->magic,
1285 *(unsigned int *) device->discipline->name);
1286 return -EINVAL;
1287 }
1288 return 0;
1289}
1290
1291
1292
1293
1294
1295
1296
1297int dasd_term_IO(struct dasd_ccw_req *cqr)
1298{
1299 struct dasd_device *device;
1300 int retries, rc;
1301 char errorstring[ERRORLENGTH];
1302
1303
1304 rc = dasd_check_cqr(cqr);
1305 if (rc)
1306 return rc;
1307 retries = 0;
1308 device = (struct dasd_device *) cqr->startdev;
1309 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
1310 rc = ccw_device_clear(device->cdev, (long) cqr);
1311 switch (rc) {
1312 case 0:
1313 cqr->status = DASD_CQR_CLEAR_PENDING;
1314 cqr->stopclk = get_tod_clock();
1315 cqr->starttime = 0;
1316 DBF_DEV_EVENT(DBF_DEBUG, device,
1317 "terminate cqr %p successful",
1318 cqr);
1319 break;
1320 case -ENODEV:
1321 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1322 "device gone, retry");
1323 break;
1324 case -EIO:
1325 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1326 "I/O error, retry");
1327 break;
1328 case -EINVAL:
1329
1330
1331
1332
1333 cqr->status = DASD_CQR_CLEARED;
1334 cqr->stopclk = get_tod_clock();
1335 cqr->starttime = 0;
1336
1337 cqr->retries = -1;
1338 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1339 "EINVAL, handle as terminated");
1340
1341 rc = 0;
1342 break;
1343 case -EBUSY:
1344 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1345 "device busy, retry later");
1346 break;
1347 default:
1348
1349 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
1350 dev_err(&device->cdev->dev, "An error occurred in the "
1351 "DASD device driver, reason=%s\n", errorstring);
1352 BUG();
1353 break;
1354 }
1355 retries++;
1356 }
1357 dasd_schedule_device_bh(device);
1358 return rc;
1359}
1360EXPORT_SYMBOL(dasd_term_IO);
1361
1362
1363
1364
1365
1366int dasd_start_IO(struct dasd_ccw_req *cqr)
1367{
1368 struct dasd_device *device;
1369 int rc;
1370 char errorstring[ERRORLENGTH];
1371
1372
1373 rc = dasd_check_cqr(cqr);
1374 if (rc) {
1375 cqr->intrc = rc;
1376 return rc;
1377 }
1378 device = (struct dasd_device *) cqr->startdev;
1379 if (((cqr->block &&
1380 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
1381 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
1382 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1383 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
1384 "because of stolen lock", cqr);
1385 cqr->status = DASD_CQR_ERROR;
1386 cqr->intrc = -EPERM;
1387 return -EPERM;
1388 }
1389 if (cqr->retries < 0) {
1390
1391 sprintf(errorstring, "14 %p", cqr);
1392 dev_err(&device->cdev->dev, "An error occurred in the DASD "
1393 "device driver, reason=%s\n", errorstring);
1394 cqr->status = DASD_CQR_ERROR;
1395 return -EIO;
1396 }
1397 cqr->startclk = get_tod_clock();
1398 cqr->starttime = jiffies;
1399 cqr->retries--;
1400 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1401 cqr->lpm &= device->path_data.opm;
1402 if (!cqr->lpm)
1403 cqr->lpm = device->path_data.opm;
1404 }
1405 if (cqr->cpmode == 1) {
1406 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
1407 (long) cqr, cqr->lpm);
1408 } else {
1409 rc = ccw_device_start(device->cdev, cqr->cpaddr,
1410 (long) cqr, cqr->lpm, 0);
1411 }
1412 switch (rc) {
1413 case 0:
1414 cqr->status = DASD_CQR_IN_IO;
1415 break;
1416 case -EBUSY:
1417 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1418 "start_IO: device busy, retry later");
1419 break;
1420 case -ETIMEDOUT:
1421 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1422 "start_IO: request timeout, retry later");
1423 break;
1424 case -EACCES:
1425
1426
1427
1428
1429
1430
1431
1432 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1433 DBF_DEV_EVENT(DBF_WARNING, device,
1434 "start_IO: selected paths gone (%x)",
1435 cqr->lpm);
1436 } else if (cqr->lpm != device->path_data.opm) {
1437 cqr->lpm = device->path_data.opm;
1438 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
1439 "start_IO: selected paths gone,"
1440 " retry on all paths");
1441 } else {
1442 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1443 "start_IO: all paths in opm gone,"
1444 " do path verification");
1445 dasd_generic_last_path_gone(device);
1446 device->path_data.opm = 0;
1447 device->path_data.ppm = 0;
1448 device->path_data.npm = 0;
1449 device->path_data.tbvpm =
1450 ccw_device_get_path_mask(device->cdev);
1451 }
1452 break;
1453 case -ENODEV:
1454 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1455 "start_IO: -ENODEV device gone, retry");
1456 break;
1457 case -EIO:
1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1459 "start_IO: -EIO device gone, retry");
1460 break;
1461 case -EINVAL:
1462
1463 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1464 "start_IO: -EINVAL device currently "
1465 "not accessible");
1466 break;
1467 default:
1468
1469 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1470 dev_err(&device->cdev->dev,
1471 "An error occurred in the DASD device driver, "
1472 "reason=%s\n", errorstring);
1473 BUG();
1474 break;
1475 }
1476 cqr->intrc = rc;
1477 return rc;
1478}
1479EXPORT_SYMBOL(dasd_start_IO);
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489static void dasd_device_timeout(unsigned long ptr)
1490{
1491 unsigned long flags;
1492 struct dasd_device *device;
1493
1494 device = (struct dasd_device *) ptr;
1495 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1496
1497 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1498 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1499 dasd_schedule_device_bh(device);
1500}
1501
1502
1503
1504
1505void dasd_device_set_timer(struct dasd_device *device, int expires)
1506{
1507 if (expires == 0)
1508 del_timer(&device->timer);
1509 else
1510 mod_timer(&device->timer, jiffies + expires);
1511}
1512EXPORT_SYMBOL(dasd_device_set_timer);
1513
1514
1515
1516
1517void dasd_device_clear_timer(struct dasd_device *device)
1518{
1519 del_timer(&device->timer);
1520}
1521EXPORT_SYMBOL(dasd_device_clear_timer);
1522
1523static void dasd_handle_killed_request(struct ccw_device *cdev,
1524 unsigned long intparm)
1525{
1526 struct dasd_ccw_req *cqr;
1527 struct dasd_device *device;
1528
1529 if (!intparm)
1530 return;
1531 cqr = (struct dasd_ccw_req *) intparm;
1532 if (cqr->status != DASD_CQR_IN_IO) {
1533 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1534 "invalid status in handle_killed_request: "
1535 "%02x", cqr->status);
1536 return;
1537 }
1538
1539 device = dasd_device_from_cdev_locked(cdev);
1540 if (IS_ERR(device)) {
1541 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1542 "unable to get device from cdev");
1543 return;
1544 }
1545
1546 if (!cqr->startdev ||
1547 device != cqr->startdev ||
1548 strncmp(cqr->startdev->discipline->ebcname,
1549 (char *) &cqr->magic, 4)) {
1550 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1551 "invalid device in request");
1552 dasd_put_device(device);
1553 return;
1554 }
1555
1556
1557 cqr->status = DASD_CQR_QUEUED;
1558
1559 dasd_device_clear_timer(device);
1560 dasd_schedule_device_bh(device);
1561 dasd_put_device(device);
1562}
1563
1564void dasd_generic_handle_state_change(struct dasd_device *device)
1565{
1566
1567 dasd_eer_snss(device);
1568
1569 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1570 dasd_schedule_device_bh(device);
1571 if (device->block)
1572 dasd_schedule_block_bh(device->block);
1573}
1574EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
1575
1576
1577
1578
1579void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1580 struct irb *irb)
1581{
1582 struct dasd_ccw_req *cqr, *next;
1583 struct dasd_device *device;
1584 unsigned long long now;
1585 int expires;
1586
1587 if (IS_ERR(irb)) {
1588 switch (PTR_ERR(irb)) {
1589 case -EIO:
1590 break;
1591 case -ETIMEDOUT:
1592 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1593 "request timed out\n", __func__);
1594 break;
1595 default:
1596 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1597 "unknown error %ld\n", __func__,
1598 PTR_ERR(irb));
1599 }
1600 dasd_handle_killed_request(cdev, intparm);
1601 return;
1602 }
1603
1604 now = get_tod_clock();
1605 cqr = (struct dasd_ccw_req *) intparm;
1606
1607 if (!cqr ||
1608 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1609 scsw_cstat(&irb->scsw) == 0)) {
1610 if (cqr)
1611 memcpy(&cqr->irb, irb, sizeof(*irb));
1612 device = dasd_device_from_cdev_locked(cdev);
1613 if (IS_ERR(device))
1614 return;
1615
1616 if (device->discipline == dasd_diag_discipline_pointer) {
1617 dasd_put_device(device);
1618 return;
1619 }
1620 device->discipline->dump_sense_dbf(device, irb, "int");
1621 if (device->features & DASD_FEATURE_ERPLOG)
1622 device->discipline->dump_sense(device, cqr, irb);
1623 device->discipline->check_for_device_change(device, cqr, irb);
1624 dasd_put_device(device);
1625 }
1626
1627
1628 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
1629 device = dasd_device_from_cdev_locked(cdev);
1630 device->discipline->check_attention(device, irb->esw.esw1.lpum);
1631 dasd_put_device(device);
1632 }
1633
1634 if (!cqr)
1635 return;
1636
1637 device = (struct dasd_device *) cqr->startdev;
1638 if (!device ||
1639 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1640 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1641 "invalid device in request");
1642 return;
1643 }
1644
1645
1646 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1647 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1648 cqr->status = DASD_CQR_CLEARED;
1649 dasd_device_clear_timer(device);
1650 wake_up(&dasd_flush_wq);
1651 dasd_schedule_device_bh(device);
1652 return;
1653 }
1654
1655
1656 if (cqr->status != DASD_CQR_IN_IO) {
1657 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1658 "status %02x", dev_name(&cdev->dev), cqr->status);
1659 return;
1660 }
1661
1662 next = NULL;
1663 expires = 0;
1664 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1665 scsw_cstat(&irb->scsw) == 0) {
1666
1667 cqr->status = DASD_CQR_SUCCESS;
1668 cqr->stopclk = now;
1669
1670 if (cqr->devlist.next != &device->ccw_queue) {
1671 next = list_entry(cqr->devlist.next,
1672 struct dasd_ccw_req, devlist);
1673 }
1674 } else {
1675
1676
1677
1678
1679 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1680 cqr->retries > 0) {
1681 if (cqr->lpm == device->path_data.opm)
1682 DBF_DEV_EVENT(DBF_DEBUG, device,
1683 "default ERP in fastpath "
1684 "(%i retries left)",
1685 cqr->retries);
1686 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1687 cqr->lpm = device->path_data.opm;
1688 cqr->status = DASD_CQR_QUEUED;
1689 next = cqr;
1690 } else
1691 cqr->status = DASD_CQR_ERROR;
1692 }
1693 if (next && (next->status == DASD_CQR_QUEUED) &&
1694 (!device->stopped)) {
1695 if (device->discipline->start_IO(next) == 0)
1696 expires = next->expires;
1697 }
1698 if (expires != 0)
1699 dasd_device_set_timer(device, expires);
1700 else
1701 dasd_device_clear_timer(device);
1702 dasd_schedule_device_bh(device);
1703}
1704EXPORT_SYMBOL(dasd_int_handler);
1705
1706enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1707{
1708 struct dasd_device *device;
1709
1710 device = dasd_device_from_cdev_locked(cdev);
1711
1712 if (IS_ERR(device))
1713 goto out;
1714 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1715 device->state != device->target ||
1716 !device->discipline->check_for_device_change){
1717 dasd_put_device(device);
1718 goto out;
1719 }
1720 if (device->discipline->dump_sense_dbf)
1721 device->discipline->dump_sense_dbf(device, irb, "uc");
1722 device->discipline->check_for_device_change(device, NULL, irb);
1723 dasd_put_device(device);
1724out:
1725 return UC_TODO_RETRY;
1726}
1727EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1728
1729
1730
1731
1732
1733static void __dasd_device_recovery(struct dasd_device *device,
1734 struct dasd_ccw_req *ref_cqr)
1735{
1736 struct list_head *l, *n;
1737 struct dasd_ccw_req *cqr;
1738
1739
1740
1741
1742 if (!ref_cqr->block)
1743 return;
1744
1745 list_for_each_safe(l, n, &device->ccw_queue) {
1746 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1747 if (cqr->status == DASD_CQR_QUEUED &&
1748 ref_cqr->block == cqr->block) {
1749 cqr->status = DASD_CQR_CLEARED;
1750 }
1751 }
1752};
1753
1754
1755
1756
1757
1758static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1759 struct list_head *final_queue)
1760{
1761 struct list_head *l, *n;
1762 struct dasd_ccw_req *cqr;
1763
1764
1765 list_for_each_safe(l, n, &device->ccw_queue) {
1766 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1767
1768
1769 if (cqr->status == DASD_CQR_QUEUED ||
1770 cqr->status == DASD_CQR_IN_IO ||
1771 cqr->status == DASD_CQR_CLEAR_PENDING)
1772 continue;
1773 if (cqr->status == DASD_CQR_ERROR) {
1774 __dasd_device_recovery(device, cqr);
1775 }
1776
1777 list_move_tail(&cqr->devlist, final_queue);
1778 }
1779}
1780
1781
1782
1783
1784
1785static void __dasd_device_process_final_queue(struct dasd_device *device,
1786 struct list_head *final_queue)
1787{
1788 struct list_head *l, *n;
1789 struct dasd_ccw_req *cqr;
1790 struct dasd_block *block;
1791 void (*callback)(struct dasd_ccw_req *, void *data);
1792 void *callback_data;
1793 char errorstring[ERRORLENGTH];
1794
1795 list_for_each_safe(l, n, final_queue) {
1796 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1797 list_del_init(&cqr->devlist);
1798 block = cqr->block;
1799 callback = cqr->callback;
1800 callback_data = cqr->callback_data;
1801 if (block)
1802 spin_lock_bh(&block->queue_lock);
1803 switch (cqr->status) {
1804 case DASD_CQR_SUCCESS:
1805 cqr->status = DASD_CQR_DONE;
1806 break;
1807 case DASD_CQR_ERROR:
1808 cqr->status = DASD_CQR_NEED_ERP;
1809 break;
1810 case DASD_CQR_CLEARED:
1811 cqr->status = DASD_CQR_TERMINATED;
1812 break;
1813 default:
1814
1815 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1816 dev_err(&device->cdev->dev,
1817 "An error occurred in the DASD device driver, "
1818 "reason=%s\n", errorstring);
1819 BUG();
1820 }
1821 if (cqr->callback != NULL)
1822 (callback)(cqr, callback_data);
1823 if (block)
1824 spin_unlock_bh(&block->queue_lock);
1825 }
1826}
1827
1828
1829
1830
1831
1832static void __dasd_device_check_expire(struct dasd_device *device)
1833{
1834 struct dasd_ccw_req *cqr;
1835
1836 if (list_empty(&device->ccw_queue))
1837 return;
1838 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1839 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1840 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1841 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
1842
1843
1844
1845
1846 cqr->retries++;
1847 }
1848 if (device->discipline->term_IO(cqr) != 0) {
1849
1850 dev_err(&device->cdev->dev,
1851 "cqr %p timed out (%lus) but cannot be "
1852 "ended, retrying in 5 s\n",
1853 cqr, (cqr->expires/HZ));
1854 cqr->expires += 5*HZ;
1855 dasd_device_set_timer(device, 5*HZ);
1856 } else {
1857 dev_err(&device->cdev->dev,
1858 "cqr %p timed out (%lus), %i retries "
1859 "remaining\n", cqr, (cqr->expires/HZ),
1860 cqr->retries);
1861 }
1862 }
1863}
1864
1865
1866
1867
1868static int __dasd_device_is_unusable(struct dasd_device *device,
1869 struct dasd_ccw_req *cqr)
1870{
1871 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM);
1872
1873 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
1874
1875 return 1;
1876 }
1877 if (device->stopped) {
1878 if (device->stopped & mask) {
1879
1880 return 1;
1881 }
1882 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
1883
1884
1885 return 1;
1886 }
1887
1888 }
1889 return 0;
1890}
1891
1892
1893
1894
1895
1896static void __dasd_device_start_head(struct dasd_device *device)
1897{
1898 struct dasd_ccw_req *cqr;
1899 int rc;
1900
1901 if (list_empty(&device->ccw_queue))
1902 return;
1903 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1904 if (cqr->status != DASD_CQR_QUEUED)
1905 return;
1906
1907 if (__dasd_device_is_unusable(device, cqr)) {
1908 cqr->intrc = -EAGAIN;
1909 cqr->status = DASD_CQR_CLEARED;
1910 dasd_schedule_device_bh(device);
1911 return;
1912 }
1913
1914 rc = device->discipline->start_IO(cqr);
1915 if (rc == 0)
1916 dasd_device_set_timer(device, cqr->expires);
1917 else if (rc == -EACCES) {
1918 dasd_schedule_device_bh(device);
1919 } else
1920
1921 dasd_device_set_timer(device, 50);
1922}
1923
1924static void __dasd_device_check_path_events(struct dasd_device *device)
1925{
1926 int rc;
1927
1928 if (device->path_data.tbvpm) {
1929 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1930 DASD_UNRESUMED_PM))
1931 return;
1932 rc = device->discipline->verify_path(
1933 device, device->path_data.tbvpm);
1934 if (rc)
1935 dasd_device_set_timer(device, 50);
1936 else
1937 device->path_data.tbvpm = 0;
1938 }
1939};
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951int dasd_flush_device_queue(struct dasd_device *device)
1952{
1953 struct dasd_ccw_req *cqr, *n;
1954 int rc;
1955 struct list_head flush_queue;
1956
1957 INIT_LIST_HEAD(&flush_queue);
1958 spin_lock_irq(get_ccwdev_lock(device->cdev));
1959 rc = 0;
1960 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1961
1962 switch (cqr->status) {
1963 case DASD_CQR_IN_IO:
1964 rc = device->discipline->term_IO(cqr);
1965 if (rc) {
1966
1967 dev_err(&device->cdev->dev,
1968 "Flushing the DASD request queue "
1969 "failed for request %p\n", cqr);
1970
1971 goto finished;
1972 }
1973 break;
1974 case DASD_CQR_QUEUED:
1975 cqr->stopclk = get_tod_clock();
1976 cqr->status = DASD_CQR_CLEARED;
1977 break;
1978 default:
1979 break;
1980 }
1981 list_move_tail(&cqr->devlist, &flush_queue);
1982 }
1983finished:
1984 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1985
1986
1987
1988
1989
1990 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1991 wait_event(dasd_flush_wq,
1992 (cqr->status != DASD_CQR_CLEAR_PENDING));
1993
1994
1995
1996
1997 __dasd_device_process_final_queue(device, &flush_queue);
1998 return rc;
1999}
2000EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
2001
2002
2003
2004
2005static void dasd_device_tasklet(struct dasd_device *device)
2006{
2007 struct list_head final_queue;
2008
2009 atomic_set (&device->tasklet_scheduled, 0);
2010 INIT_LIST_HEAD(&final_queue);
2011 spin_lock_irq(get_ccwdev_lock(device->cdev));
2012
2013 __dasd_device_check_expire(device);
2014
2015 __dasd_device_process_ccw_queue(device, &final_queue);
2016 __dasd_device_check_path_events(device);
2017 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2018
2019 __dasd_device_process_final_queue(device, &final_queue);
2020 spin_lock_irq(get_ccwdev_lock(device->cdev));
2021
2022 __dasd_device_start_head(device);
2023 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2024 if (waitqueue_active(&shutdown_waitq))
2025 wake_up(&shutdown_waitq);
2026 dasd_put_device(device);
2027}
2028
2029
2030
2031
2032void dasd_schedule_device_bh(struct dasd_device *device)
2033{
2034
2035 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
2036 return;
2037 dasd_get_device(device);
2038 tasklet_hi_schedule(&device->tasklet);
2039}
2040EXPORT_SYMBOL(dasd_schedule_device_bh);
2041
2042void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
2043{
2044 device->stopped |= bits;
2045}
2046EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
2047
2048void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
2049{
2050 device->stopped &= ~bits;
2051 if (!device->stopped)
2052 wake_up(&generic_waitq);
2053}
2054EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
2055
2056
2057
2058
2059
2060void dasd_add_request_head(struct dasd_ccw_req *cqr)
2061{
2062 struct dasd_device *device;
2063 unsigned long flags;
2064
2065 device = cqr->startdev;
2066 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2067 cqr->status = DASD_CQR_QUEUED;
2068 list_add(&cqr->devlist, &device->ccw_queue);
2069
2070 dasd_schedule_device_bh(device);
2071 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2072}
2073EXPORT_SYMBOL(dasd_add_request_head);
2074
2075
2076
2077
2078
2079void dasd_add_request_tail(struct dasd_ccw_req *cqr)
2080{
2081 struct dasd_device *device;
2082 unsigned long flags;
2083
2084 device = cqr->startdev;
2085 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2086 cqr->status = DASD_CQR_QUEUED;
2087 list_add_tail(&cqr->devlist, &device->ccw_queue);
2088
2089 dasd_schedule_device_bh(device);
2090 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2091}
2092EXPORT_SYMBOL(dasd_add_request_tail);
2093
2094
2095
2096
2097void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
2098{
2099 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2100 cqr->callback_data = DASD_SLEEPON_END_TAG;
2101 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
2102 wake_up(&generic_waitq);
2103}
2104EXPORT_SYMBOL_GPL(dasd_wakeup_cb);
2105
2106static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
2107{
2108 struct dasd_device *device;
2109 int rc;
2110
2111 device = cqr->startdev;
2112 spin_lock_irq(get_ccwdev_lock(device->cdev));
2113 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
2114 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2115 return rc;
2116}
2117
2118
2119
2120
2121static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
2122{
2123 struct dasd_device *device;
2124 dasd_erp_fn_t erp_fn;
2125
2126 if (cqr->status == DASD_CQR_FILLED)
2127 return 0;
2128 device = cqr->startdev;
2129 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2130 if (cqr->status == DASD_CQR_TERMINATED) {
2131 device->discipline->handle_terminated_request(cqr);
2132 return 1;
2133 }
2134 if (cqr->status == DASD_CQR_NEED_ERP) {
2135 erp_fn = device->discipline->erp_action(cqr);
2136 erp_fn(cqr);
2137 return 1;
2138 }
2139 if (cqr->status == DASD_CQR_FAILED)
2140 dasd_log_sense(cqr, &cqr->irb);
2141 if (cqr->refers) {
2142 __dasd_process_erp(device, cqr);
2143 return 1;
2144 }
2145 }
2146 return 0;
2147}
2148
2149static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
2150{
2151 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
2152 if (cqr->refers)
2153 return 1;
2154 return ((cqr->status != DASD_CQR_DONE) &&
2155 (cqr->status != DASD_CQR_FAILED));
2156 } else
2157 return (cqr->status == DASD_CQR_FILLED);
2158}
2159
2160static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
2161{
2162 struct dasd_device *device;
2163 int rc;
2164 struct list_head ccw_queue;
2165 struct dasd_ccw_req *cqr;
2166
2167 INIT_LIST_HEAD(&ccw_queue);
2168 maincqr->status = DASD_CQR_FILLED;
2169 device = maincqr->startdev;
2170 list_add(&maincqr->blocklist, &ccw_queue);
2171 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
2172 cqr = list_first_entry(&ccw_queue,
2173 struct dasd_ccw_req, blocklist)) {
2174
2175 if (__dasd_sleep_on_erp(cqr))
2176 continue;
2177 if (cqr->status != DASD_CQR_FILLED)
2178 continue;
2179 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2180 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2181 cqr->status = DASD_CQR_FAILED;
2182 cqr->intrc = -EPERM;
2183 continue;
2184 }
2185
2186 if (device->stopped & ~DASD_STOPPED_PENDING &&
2187 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2188 (!dasd_eer_enabled(device))) {
2189 cqr->status = DASD_CQR_FAILED;
2190 cqr->intrc = -ENOLINK;
2191 continue;
2192 }
2193
2194
2195
2196
2197 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
2198 if (interruptible) {
2199 rc = wait_event_interruptible(
2200 generic_waitq, !(device->stopped));
2201 if (rc == -ERESTARTSYS) {
2202 cqr->status = DASD_CQR_FAILED;
2203 maincqr->intrc = rc;
2204 continue;
2205 }
2206 } else
2207 wait_event(generic_waitq, !(device->stopped));
2208 }
2209 if (!cqr->callback)
2210 cqr->callback = dasd_wakeup_cb;
2211
2212 cqr->callback_data = DASD_SLEEPON_START_TAG;
2213 dasd_add_request_tail(cqr);
2214 if (interruptible) {
2215 rc = wait_event_interruptible(
2216 generic_waitq, _wait_for_wakeup(cqr));
2217 if (rc == -ERESTARTSYS) {
2218 dasd_cancel_req(cqr);
2219
2220 wait_event(generic_waitq,
2221 _wait_for_wakeup(cqr));
2222 cqr->status = DASD_CQR_FAILED;
2223 maincqr->intrc = rc;
2224 continue;
2225 }
2226 } else
2227 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2228 }
2229
2230 maincqr->endclk = get_tod_clock();
2231 if ((maincqr->status != DASD_CQR_DONE) &&
2232 (maincqr->intrc != -ERESTARTSYS))
2233 dasd_log_sense(maincqr, &maincqr->irb);
2234 if (maincqr->status == DASD_CQR_DONE)
2235 rc = 0;
2236 else if (maincqr->intrc)
2237 rc = maincqr->intrc;
2238 else
2239 rc = -EIO;
2240 return rc;
2241}
2242
2243static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue)
2244{
2245 struct dasd_ccw_req *cqr;
2246
2247 list_for_each_entry(cqr, ccw_queue, blocklist) {
2248 if (cqr->callback_data != DASD_SLEEPON_END_TAG)
2249 return 0;
2250 }
2251
2252 return 1;
2253}
2254
2255static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
2256{
2257 struct dasd_device *device;
2258 struct dasd_ccw_req *cqr, *n;
2259 int rc;
2260
2261retry:
2262 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2263 device = cqr->startdev;
2264 if (cqr->status != DASD_CQR_FILLED)
2265 continue;
2266
2267 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2268 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2269 cqr->status = DASD_CQR_FAILED;
2270 cqr->intrc = -EPERM;
2271 continue;
2272 }
2273
2274 if (device->stopped & ~DASD_STOPPED_PENDING &&
2275 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2276 !dasd_eer_enabled(device)) {
2277 cqr->status = DASD_CQR_FAILED;
2278 cqr->intrc = -EAGAIN;
2279 continue;
2280 }
2281
2282
2283 if (interruptible) {
2284 rc = wait_event_interruptible(
2285 generic_waitq, !device->stopped);
2286 if (rc == -ERESTARTSYS) {
2287 cqr->status = DASD_CQR_FAILED;
2288 cqr->intrc = rc;
2289 continue;
2290 }
2291 } else
2292 wait_event(generic_waitq, !(device->stopped));
2293
2294 if (!cqr->callback)
2295 cqr->callback = dasd_wakeup_cb;
2296 cqr->callback_data = DASD_SLEEPON_START_TAG;
2297 dasd_add_request_tail(cqr);
2298 }
2299
2300 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue));
2301
2302 rc = 0;
2303 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
2304
2305
2306
2307
2308
2309 if (cqr->startdev != cqr->basedev && !cqr->refers &&
2310 (cqr->status == DASD_CQR_TERMINATED ||
2311 cqr->status == DASD_CQR_NEED_ERP))
2312 return -EAGAIN;
2313
2314
2315 if (__dasd_sleep_on_erp(cqr))
2316
2317 goto retry;
2318 }
2319
2320 return 0;
2321}
2322
2323
2324
2325
2326
2327int dasd_sleep_on(struct dasd_ccw_req *cqr)
2328{
2329 return _dasd_sleep_on(cqr, 0);
2330}
2331EXPORT_SYMBOL(dasd_sleep_on);
2332
2333
2334
2335
2336int dasd_sleep_on_queue(struct list_head *ccw_queue)
2337{
2338 return _dasd_sleep_on_queue(ccw_queue, 0);
2339}
2340EXPORT_SYMBOL(dasd_sleep_on_queue);
2341
2342
2343
2344
2345
2346int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
2347{
2348 return _dasd_sleep_on(cqr, 1);
2349}
2350EXPORT_SYMBOL(dasd_sleep_on_interruptible);
2351
2352
2353
2354
2355
2356
2357
2358static inline int _dasd_term_running_cqr(struct dasd_device *device)
2359{
2360 struct dasd_ccw_req *cqr;
2361 int rc;
2362
2363 if (list_empty(&device->ccw_queue))
2364 return 0;
2365 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
2366 rc = device->discipline->term_IO(cqr);
2367 if (!rc)
2368
2369
2370
2371
2372
2373 cqr->retries++;
2374 return rc;
2375}
2376
2377int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
2378{
2379 struct dasd_device *device;
2380 int rc;
2381
2382 device = cqr->startdev;
2383 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
2384 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2385 cqr->status = DASD_CQR_FAILED;
2386 cqr->intrc = -EPERM;
2387 return -EIO;
2388 }
2389 spin_lock_irq(get_ccwdev_lock(device->cdev));
2390 rc = _dasd_term_running_cqr(device);
2391 if (rc) {
2392 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2393 return rc;
2394 }
2395 cqr->callback = dasd_wakeup_cb;
2396 cqr->callback_data = DASD_SLEEPON_START_TAG;
2397 cqr->status = DASD_CQR_QUEUED;
2398
2399
2400
2401
2402 list_add(&cqr->devlist, device->ccw_queue.next);
2403
2404
2405 dasd_schedule_device_bh(device);
2406
2407 spin_unlock_irq(get_ccwdev_lock(device->cdev));
2408
2409 wait_event(generic_waitq, _wait_for_wakeup(cqr));
2410
2411 if (cqr->status == DASD_CQR_DONE)
2412 rc = 0;
2413 else if (cqr->intrc)
2414 rc = cqr->intrc;
2415 else
2416 rc = -EIO;
2417
2418
2419 dasd_schedule_device_bh(device);
2420 if (device->block)
2421 dasd_schedule_block_bh(device->block);
2422
2423 return rc;
2424}
2425EXPORT_SYMBOL(dasd_sleep_on_immediatly);
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436int dasd_cancel_req(struct dasd_ccw_req *cqr)
2437{
2438 struct dasd_device *device = cqr->startdev;
2439 unsigned long flags;
2440 int rc;
2441
2442 rc = 0;
2443 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
2444 switch (cqr->status) {
2445 case DASD_CQR_QUEUED:
2446
2447 cqr->status = DASD_CQR_CLEARED;
2448 if (cqr->callback_data == DASD_SLEEPON_START_TAG)
2449 cqr->callback_data = DASD_SLEEPON_END_TAG;
2450 break;
2451 case DASD_CQR_IN_IO:
2452
2453 rc = device->discipline->term_IO(cqr);
2454 if (rc) {
2455 dev_err(&device->cdev->dev,
2456 "Cancelling request %p failed with rc=%d\n",
2457 cqr, rc);
2458 } else {
2459 cqr->stopclk = get_tod_clock();
2460 }
2461 break;
2462 default:
2463 break;
2464 }
2465 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
2466 dasd_schedule_device_bh(device);
2467 return rc;
2468}
2469EXPORT_SYMBOL(dasd_cancel_req);
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480static void dasd_block_timeout(unsigned long ptr)
2481{
2482 unsigned long flags;
2483 struct dasd_block *block;
2484
2485 block = (struct dasd_block *) ptr;
2486 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
2487
2488 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
2489 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
2490 dasd_schedule_block_bh(block);
2491}
2492
2493
2494
2495
2496void dasd_block_set_timer(struct dasd_block *block, int expires)
2497{
2498 if (expires == 0)
2499 del_timer(&block->timer);
2500 else
2501 mod_timer(&block->timer, jiffies + expires);
2502}
2503EXPORT_SYMBOL(dasd_block_set_timer);
2504
2505
2506
2507
2508void dasd_block_clear_timer(struct dasd_block *block)
2509{
2510 del_timer(&block->timer);
2511}
2512EXPORT_SYMBOL(dasd_block_clear_timer);
2513
2514
2515
2516
2517static void __dasd_process_erp(struct dasd_device *device,
2518 struct dasd_ccw_req *cqr)
2519{
2520 dasd_erp_fn_t erp_fn;
2521
2522 if (cqr->status == DASD_CQR_DONE)
2523 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
2524 else
2525 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
2526 erp_fn = device->discipline->erp_postaction(cqr);
2527 erp_fn(cqr);
2528}
2529
2530
2531
2532
2533static void __dasd_process_request_queue(struct dasd_block *block)
2534{
2535 struct request_queue *queue;
2536 struct request *req;
2537 struct dasd_ccw_req *cqr;
2538 struct dasd_device *basedev;
2539 unsigned long flags;
2540 queue = block->request_queue;
2541 basedev = block->base;
2542
2543 if (queue == NULL)
2544 return;
2545
2546
2547
2548
2549
2550
2551
2552
2553 if (basedev->state < DASD_STATE_READY) {
2554 while ((req = blk_fetch_request(block->request_queue)))
2555 __blk_end_request_all(req, -EIO);
2556 return;
2557 }
2558
2559
2560 if (basedev->stopped)
2561 return;
2562
2563
2564 while ((req = blk_peek_request(queue))) {
2565 if (basedev->features & DASD_FEATURE_READONLY &&
2566 rq_data_dir(req) == WRITE) {
2567 DBF_DEV_EVENT(DBF_ERR, basedev,
2568 "Rejecting write request %p",
2569 req);
2570 blk_start_request(req);
2571 __blk_end_request_all(req, -EIO);
2572 continue;
2573 }
2574 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) &&
2575 (basedev->features & DASD_FEATURE_FAILFAST ||
2576 blk_noretry_request(req))) {
2577 DBF_DEV_EVENT(DBF_ERR, basedev,
2578 "Rejecting failfast request %p",
2579 req);
2580 blk_start_request(req);
2581 __blk_end_request_all(req, -ETIMEDOUT);
2582 continue;
2583 }
2584 cqr = basedev->discipline->build_cp(basedev, block, req);
2585 if (IS_ERR(cqr)) {
2586 if (PTR_ERR(cqr) == -EBUSY)
2587 break;
2588 if (PTR_ERR(cqr) == -ENOMEM)
2589 break;
2590 if (PTR_ERR(cqr) == -EAGAIN) {
2591
2592
2593
2594
2595
2596
2597 if (!list_empty(&block->ccw_queue))
2598 break;
2599 spin_lock_irqsave(
2600 get_ccwdev_lock(basedev->cdev), flags);
2601 dasd_device_set_stop_bits(basedev,
2602 DASD_STOPPED_PENDING);
2603 spin_unlock_irqrestore(
2604 get_ccwdev_lock(basedev->cdev), flags);
2605 dasd_block_set_timer(block, HZ/2);
2606 break;
2607 }
2608 DBF_DEV_EVENT(DBF_ERR, basedev,
2609 "CCW creation failed (rc=%ld) "
2610 "on request %p",
2611 PTR_ERR(cqr), req);
2612 blk_start_request(req);
2613 __blk_end_request_all(req, -EIO);
2614 continue;
2615 }
2616
2617
2618
2619
2620 cqr->callback_data = (void *) req;
2621 cqr->status = DASD_CQR_FILLED;
2622 req->completion_data = cqr;
2623 blk_start_request(req);
2624 list_add_tail(&cqr->blocklist, &block->ccw_queue);
2625 INIT_LIST_HEAD(&cqr->devlist);
2626 dasd_profile_start(block, cqr, req);
2627 }
2628}
2629
2630static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
2631{
2632 struct request *req;
2633 int status;
2634 int error = 0;
2635
2636 req = (struct request *) cqr->callback_data;
2637 dasd_profile_end(cqr->block, cqr, req);
2638 status = cqr->block->base->discipline->free_cp(cqr, req);
2639 if (status < 0)
2640 error = status;
2641 else if (status == 0) {
2642 if (cqr->intrc == -EPERM)
2643 error = -EBADE;
2644 else if (cqr->intrc == -ENOLINK ||
2645 cqr->intrc == -ETIMEDOUT)
2646 error = cqr->intrc;
2647 else
2648 error = -EIO;
2649 }
2650 __blk_end_request_all(req, error);
2651}
2652
2653
2654
2655
2656static void __dasd_process_block_ccw_queue(struct dasd_block *block,
2657 struct list_head *final_queue)
2658{
2659 struct list_head *l, *n;
2660 struct dasd_ccw_req *cqr;
2661 dasd_erp_fn_t erp_fn;
2662 unsigned long flags;
2663 struct dasd_device *base = block->base;
2664
2665restart:
2666
2667 list_for_each_safe(l, n, &block->ccw_queue) {
2668 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2669 if (cqr->status != DASD_CQR_DONE &&
2670 cqr->status != DASD_CQR_FAILED &&
2671 cqr->status != DASD_CQR_NEED_ERP &&
2672 cqr->status != DASD_CQR_TERMINATED)
2673 continue;
2674
2675 if (cqr->status == DASD_CQR_TERMINATED) {
2676 base->discipline->handle_terminated_request(cqr);
2677 goto restart;
2678 }
2679
2680
2681 if (cqr->status == DASD_CQR_NEED_ERP) {
2682 erp_fn = base->discipline->erp_action(cqr);
2683 if (IS_ERR(erp_fn(cqr)))
2684 continue;
2685 goto restart;
2686 }
2687
2688
2689 if (cqr->status == DASD_CQR_FAILED) {
2690 dasd_log_sense(cqr, &cqr->irb);
2691 }
2692
2693
2694 if (dasd_eer_enabled(base) &&
2695 cqr->status == DASD_CQR_FAILED) {
2696 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2697
2698
2699 cqr->status = DASD_CQR_FILLED;
2700 cqr->retries = 255;
2701 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2702 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2703 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2704 flags);
2705 goto restart;
2706 }
2707
2708
2709 if (cqr->refers) {
2710 __dasd_process_erp(base, cqr);
2711 goto restart;
2712 }
2713
2714
2715 cqr->endclk = get_tod_clock();
2716 list_move_tail(&cqr->blocklist, final_queue);
2717 }
2718}
2719
2720static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2721{
2722 dasd_schedule_block_bh(cqr->block);
2723}
2724
2725static void __dasd_block_start_head(struct dasd_block *block)
2726{
2727 struct dasd_ccw_req *cqr;
2728
2729 if (list_empty(&block->ccw_queue))
2730 return;
2731
2732
2733
2734
2735 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2736 if (cqr->status != DASD_CQR_FILLED)
2737 continue;
2738 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2739 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2740 cqr->status = DASD_CQR_FAILED;
2741 cqr->intrc = -EPERM;
2742 dasd_schedule_block_bh(block);
2743 continue;
2744 }
2745
2746 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2747 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2748 (!dasd_eer_enabled(block->base))) {
2749 cqr->status = DASD_CQR_FAILED;
2750 cqr->intrc = -ENOLINK;
2751 dasd_schedule_block_bh(block);
2752 continue;
2753 }
2754
2755 if (block->base->stopped)
2756 return;
2757
2758
2759 if (!cqr->startdev)
2760 cqr->startdev = block->base;
2761
2762
2763 cqr->callback = dasd_return_cqr_cb;
2764
2765 dasd_add_request_tail(cqr);
2766 }
2767}
2768
2769
2770
2771
2772
2773
2774static void dasd_block_tasklet(struct dasd_block *block)
2775{
2776 struct list_head final_queue;
2777 struct list_head *l, *n;
2778 struct dasd_ccw_req *cqr;
2779
2780 atomic_set(&block->tasklet_scheduled, 0);
2781 INIT_LIST_HEAD(&final_queue);
2782 spin_lock(&block->queue_lock);
2783
2784 __dasd_process_block_ccw_queue(block, &final_queue);
2785 spin_unlock(&block->queue_lock);
2786
2787 spin_lock_irq(&block->request_queue_lock);
2788 list_for_each_safe(l, n, &final_queue) {
2789 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2790 list_del_init(&cqr->blocklist);
2791 __dasd_cleanup_cqr(cqr);
2792 }
2793 spin_lock(&block->queue_lock);
2794
2795 __dasd_process_request_queue(block);
2796
2797 __dasd_block_start_head(block);
2798 spin_unlock(&block->queue_lock);
2799 spin_unlock_irq(&block->request_queue_lock);
2800 if (waitqueue_active(&shutdown_waitq))
2801 wake_up(&shutdown_waitq);
2802 dasd_put_device(block->base);
2803}
2804
2805static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2806{
2807 wake_up(&dasd_flush_wq);
2808}
2809
2810
2811
2812
2813
2814static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
2815{
2816 struct dasd_block *block = cqr->block;
2817 struct request *req;
2818 unsigned long flags;
2819
2820 if (!block)
2821 return -EINVAL;
2822 spin_lock_irqsave(&block->queue_lock, flags);
2823 req = (struct request *) cqr->callback_data;
2824 blk_requeue_request(block->request_queue, req);
2825 spin_unlock_irqrestore(&block->queue_lock, flags);
2826
2827 return 0;
2828}
2829
2830
2831
2832
2833
2834
2835static int dasd_flush_block_queue(struct dasd_block *block)
2836{
2837 struct dasd_ccw_req *cqr, *n;
2838 int rc, i;
2839 struct list_head flush_queue;
2840
2841 INIT_LIST_HEAD(&flush_queue);
2842 spin_lock_bh(&block->queue_lock);
2843 rc = 0;
2844restart:
2845 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2846
2847 if (cqr->status >= DASD_CQR_QUEUED)
2848 rc = dasd_cancel_req(cqr);
2849 if (rc < 0)
2850 break;
2851
2852
2853
2854
2855
2856 cqr->callback = _dasd_wake_block_flush_cb;
2857 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2858 list_move_tail(&cqr->blocklist, &flush_queue);
2859 if (i > 1)
2860
2861 goto restart;
2862 }
2863 spin_unlock_bh(&block->queue_lock);
2864
2865restart_cb:
2866 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2867 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2868
2869 if (cqr->refers) {
2870 spin_lock_bh(&block->queue_lock);
2871 __dasd_process_erp(block->base, cqr);
2872 spin_unlock_bh(&block->queue_lock);
2873
2874
2875 goto restart_cb;
2876 }
2877
2878 spin_lock_irq(&block->request_queue_lock);
2879 cqr->endclk = get_tod_clock();
2880 list_del_init(&cqr->blocklist);
2881 __dasd_cleanup_cqr(cqr);
2882 spin_unlock_irq(&block->request_queue_lock);
2883 }
2884 return rc;
2885}
2886
2887
2888
2889
2890void dasd_schedule_block_bh(struct dasd_block *block)
2891{
2892
2893 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2894 return;
2895
2896 dasd_get_device(block->base);
2897 tasklet_hi_schedule(&block->tasklet);
2898}
2899EXPORT_SYMBOL(dasd_schedule_block_bh);
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910static void do_dasd_request(struct request_queue *queue)
2911{
2912 struct dasd_block *block;
2913
2914 block = queue->queuedata;
2915 spin_lock(&block->queue_lock);
2916
2917 __dasd_process_request_queue(block);
2918
2919 __dasd_block_start_head(block);
2920 spin_unlock(&block->queue_lock);
2921}
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933enum blk_eh_timer_return dasd_times_out(struct request *req)
2934{
2935 struct dasd_ccw_req *cqr = req->completion_data;
2936 struct dasd_block *block = req->q->queuedata;
2937 struct dasd_device *device;
2938 int rc = 0;
2939
2940 if (!cqr)
2941 return BLK_EH_NOT_HANDLED;
2942
2943 device = cqr->startdev ? cqr->startdev : block->base;
2944 if (!device->blk_timeout)
2945 return BLK_EH_RESET_TIMER;
2946 DBF_DEV_EVENT(DBF_WARNING, device,
2947 " dasd_times_out cqr %p status %x",
2948 cqr, cqr->status);
2949
2950 spin_lock(&block->queue_lock);
2951 spin_lock(get_ccwdev_lock(device->cdev));
2952 cqr->retries = -1;
2953 cqr->intrc = -ETIMEDOUT;
2954 if (cqr->status >= DASD_CQR_QUEUED) {
2955 spin_unlock(get_ccwdev_lock(device->cdev));
2956 rc = dasd_cancel_req(cqr);
2957 } else if (cqr->status == DASD_CQR_FILLED ||
2958 cqr->status == DASD_CQR_NEED_ERP) {
2959 cqr->status = DASD_CQR_TERMINATED;
2960 spin_unlock(get_ccwdev_lock(device->cdev));
2961 } else if (cqr->status == DASD_CQR_IN_ERP) {
2962 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr;
2963
2964 list_for_each_entry_safe(searchcqr, nextcqr,
2965 &block->ccw_queue, blocklist) {
2966 tmpcqr = searchcqr;
2967 while (tmpcqr->refers)
2968 tmpcqr = tmpcqr->refers;
2969 if (tmpcqr != cqr)
2970 continue;
2971
2972 searchcqr->retries = -1;
2973 searchcqr->intrc = -ETIMEDOUT;
2974 if (searchcqr->status >= DASD_CQR_QUEUED) {
2975 spin_unlock(get_ccwdev_lock(device->cdev));
2976 rc = dasd_cancel_req(searchcqr);
2977 spin_lock(get_ccwdev_lock(device->cdev));
2978 } else if ((searchcqr->status == DASD_CQR_FILLED) ||
2979 (searchcqr->status == DASD_CQR_NEED_ERP)) {
2980 searchcqr->status = DASD_CQR_TERMINATED;
2981 rc = 0;
2982 } else if (searchcqr->status == DASD_CQR_IN_ERP) {
2983
2984
2985
2986
2987 continue;
2988 }
2989 break;
2990 }
2991 spin_unlock(get_ccwdev_lock(device->cdev));
2992 }
2993 dasd_schedule_block_bh(block);
2994 spin_unlock(&block->queue_lock);
2995
2996 return rc ? BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED;
2997}
2998
2999
3000
3001
3002static int dasd_alloc_queue(struct dasd_block *block)
3003{
3004 block->request_queue = blk_init_queue(do_dasd_request,
3005 &block->request_queue_lock);
3006 if (block->request_queue == NULL)
3007 return -ENOMEM;
3008
3009 block->request_queue->queuedata = block;
3010
3011 return 0;
3012}
3013
3014
3015
3016
3017static void dasd_setup_queue(struct dasd_block *block)
3018{
3019 int max;
3020
3021 if (block->base->features & DASD_FEATURE_USERAW) {
3022
3023
3024
3025
3026
3027
3028
3029 max = 2048;
3030 } else {
3031 max = block->base->discipline->max_blocks << block->s2b_shift;
3032 }
3033 blk_queue_logical_block_size(block->request_queue,
3034 block->bp_block);
3035 blk_queue_max_hw_sectors(block->request_queue, max);
3036 blk_queue_max_segments(block->request_queue, -1L);
3037
3038
3039
3040 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
3041 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
3042}
3043
3044
3045
3046
3047static void dasd_free_queue(struct dasd_block *block)
3048{
3049 if (block->request_queue) {
3050 blk_cleanup_queue(block->request_queue);
3051 block->request_queue = NULL;
3052 }
3053}
3054
3055
3056
3057
3058static void dasd_flush_request_queue(struct dasd_block *block)
3059{
3060 struct request *req;
3061
3062 if (!block->request_queue)
3063 return;
3064
3065 spin_lock_irq(&block->request_queue_lock);
3066 while ((req = blk_fetch_request(block->request_queue)))
3067 __blk_end_request_all(req, -EIO);
3068 spin_unlock_irq(&block->request_queue_lock);
3069}
3070
3071static int dasd_open(struct block_device *bdev, fmode_t mode)
3072{
3073 struct dasd_device *base;
3074 int rc;
3075
3076 base = dasd_device_from_gendisk(bdev->bd_disk);
3077 if (!base)
3078 return -ENODEV;
3079
3080 atomic_inc(&base->block->open_count);
3081 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
3082 rc = -ENODEV;
3083 goto unlock;
3084 }
3085
3086 if (!try_module_get(base->discipline->owner)) {
3087 rc = -EINVAL;
3088 goto unlock;
3089 }
3090
3091 if (dasd_probeonly) {
3092 dev_info(&base->cdev->dev,
3093 "Accessing the DASD failed because it is in "
3094 "probeonly mode\n");
3095 rc = -EPERM;
3096 goto out;
3097 }
3098
3099 if (base->state <= DASD_STATE_BASIC) {
3100 DBF_DEV_EVENT(DBF_ERR, base, " %s",
3101 " Cannot open unrecognized device");
3102 rc = -ENODEV;
3103 goto out;
3104 }
3105
3106 if ((mode & FMODE_WRITE) &&
3107 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
3108 (base->features & DASD_FEATURE_READONLY))) {
3109 rc = -EROFS;
3110 goto out;
3111 }
3112
3113 dasd_put_device(base);
3114 return 0;
3115
3116out:
3117 module_put(base->discipline->owner);
3118unlock:
3119 atomic_dec(&base->block->open_count);
3120 dasd_put_device(base);
3121 return rc;
3122}
3123
3124static void dasd_release(struct gendisk *disk, fmode_t mode)
3125{
3126 struct dasd_device *base = dasd_device_from_gendisk(disk);
3127 if (base) {
3128 atomic_dec(&base->block->open_count);
3129 module_put(base->discipline->owner);
3130 dasd_put_device(base);
3131 }
3132}
3133
3134
3135
3136
3137static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3138{
3139 struct dasd_device *base;
3140
3141 base = dasd_device_from_gendisk(bdev->bd_disk);
3142 if (!base)
3143 return -ENODEV;
3144
3145 if (!base->discipline ||
3146 !base->discipline->fill_geometry) {
3147 dasd_put_device(base);
3148 return -EINVAL;
3149 }
3150 base->discipline->fill_geometry(base->block, geo);
3151 geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
3152 dasd_put_device(base);
3153 return 0;
3154}
3155
3156const struct block_device_operations
3157dasd_device_operations = {
3158 .owner = THIS_MODULE,
3159 .open = dasd_open,
3160 .release = dasd_release,
3161 .ioctl = dasd_ioctl,
3162 .compat_ioctl = dasd_ioctl,
3163 .getgeo = dasd_getgeo,
3164};
3165
3166
3167
3168
3169
3170static void
3171dasd_exit(void)
3172{
3173#ifdef CONFIG_PROC_FS
3174 dasd_proc_exit();
3175#endif
3176 dasd_eer_exit();
3177 if (dasd_page_cache != NULL) {
3178 kmem_cache_destroy(dasd_page_cache);
3179 dasd_page_cache = NULL;
3180 }
3181 dasd_gendisk_exit();
3182 dasd_devmap_exit();
3183 if (dasd_debug_area != NULL) {
3184 debug_unregister(dasd_debug_area);
3185 dasd_debug_area = NULL;
3186 }
3187 dasd_statistics_removeroot();
3188}
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199int dasd_device_is_ro(struct dasd_device *device)
3200{
3201 struct ccw_dev_id dev_id;
3202 struct diag210 diag_data;
3203 int rc;
3204
3205 if (!MACHINE_IS_VM)
3206 return 0;
3207 ccw_device_get_id(device->cdev, &dev_id);
3208 memset(&diag_data, 0, sizeof(diag_data));
3209 diag_data.vrdcdvno = dev_id.devno;
3210 diag_data.vrdclen = sizeof(diag_data);
3211 rc = diag210(&diag_data);
3212 if (rc == 0 || rc == 2) {
3213 return diag_data.vrdcvfla & 0x80;
3214 } else {
3215 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
3216 dev_id.devno, rc);
3217 return 0;
3218 }
3219}
3220EXPORT_SYMBOL_GPL(dasd_device_is_ro);
3221
3222static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
3223{
3224 struct ccw_device *cdev = data;
3225 int ret;
3226
3227 ret = ccw_device_set_online(cdev);
3228 if (ret)
3229 pr_warn("%s: Setting the DASD online failed with rc=%d\n",
3230 dev_name(&cdev->dev), ret);
3231}
3232
3233
3234
3235
3236
3237int dasd_generic_probe(struct ccw_device *cdev,
3238 struct dasd_discipline *discipline)
3239{
3240 int ret;
3241
3242 ret = dasd_add_sysfs_files(cdev);
3243 if (ret) {
3244 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
3245 "dasd_generic_probe: could not add "
3246 "sysfs entries");
3247 return ret;
3248 }
3249 cdev->handler = &dasd_int_handler;
3250
3251
3252
3253
3254
3255
3256 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
3257 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
3258 async_schedule(dasd_generic_auto_online, cdev);
3259 return 0;
3260}
3261EXPORT_SYMBOL_GPL(dasd_generic_probe);
3262
3263
3264
3265
3266
3267void dasd_generic_remove(struct ccw_device *cdev)
3268{
3269 struct dasd_device *device;
3270 struct dasd_block *block;
3271
3272 cdev->handler = NULL;
3273
3274 device = dasd_device_from_cdev(cdev);
3275 if (IS_ERR(device)) {
3276 dasd_remove_sysfs_files(cdev);
3277 return;
3278 }
3279 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3280 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3281
3282 dasd_put_device(device);
3283 dasd_remove_sysfs_files(cdev);
3284 return;
3285 }
3286
3287
3288
3289
3290
3291 dasd_set_target_state(device, DASD_STATE_NEW);
3292
3293 block = device->block;
3294 dasd_delete_device(device);
3295
3296
3297
3298
3299 if (block)
3300 dasd_free_block(block);
3301
3302 dasd_remove_sysfs_files(cdev);
3303}
3304EXPORT_SYMBOL_GPL(dasd_generic_remove);
3305
3306
3307
3308
3309
3310
3311int dasd_generic_set_online(struct ccw_device *cdev,
3312 struct dasd_discipline *base_discipline)
3313{
3314 struct dasd_discipline *discipline;
3315 struct dasd_device *device;
3316 int rc;
3317
3318
3319 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
3320 device = dasd_create_device(cdev);
3321 if (IS_ERR(device))
3322 return PTR_ERR(device);
3323
3324 discipline = base_discipline;
3325 if (device->features & DASD_FEATURE_USEDIAG) {
3326 if (!dasd_diag_discipline_pointer) {
3327
3328 rc = request_module(DASD_DIAG_MOD);
3329 if (rc) {
3330 pr_warn("%s Setting the DASD online failed "
3331 "because the required module %s "
3332 "could not be loaded (rc=%d)\n",
3333 dev_name(&cdev->dev), DASD_DIAG_MOD,
3334 rc);
3335 dasd_delete_device(device);
3336 return -ENODEV;
3337 }
3338 }
3339
3340
3341 if (!dasd_diag_discipline_pointer) {
3342 pr_warn("%s Setting the DASD online failed because of missing DIAG discipline\n",
3343 dev_name(&cdev->dev));
3344 dasd_delete_device(device);
3345 return -ENODEV;
3346 }
3347 discipline = dasd_diag_discipline_pointer;
3348 }
3349 if (!try_module_get(base_discipline->owner)) {
3350 dasd_delete_device(device);
3351 return -EINVAL;
3352 }
3353 if (!try_module_get(discipline->owner)) {
3354 module_put(base_discipline->owner);
3355 dasd_delete_device(device);
3356 return -EINVAL;
3357 }
3358 device->base_discipline = base_discipline;
3359 device->discipline = discipline;
3360
3361
3362 rc = discipline->check_device(device);
3363 if (rc) {
3364 pr_warn("%s Setting the DASD online with discipline %s failed with rc=%i\n",
3365 dev_name(&cdev->dev), discipline->name, rc);
3366 module_put(discipline->owner);
3367 module_put(base_discipline->owner);
3368 dasd_delete_device(device);
3369 return rc;
3370 }
3371
3372 dasd_set_target_state(device, DASD_STATE_ONLINE);
3373 if (device->state <= DASD_STATE_KNOWN) {
3374 pr_warn("%s Setting the DASD online failed because of a missing discipline\n",
3375 dev_name(&cdev->dev));
3376 rc = -ENODEV;
3377 dasd_set_target_state(device, DASD_STATE_NEW);
3378 if (device->block)
3379 dasd_free_block(device->block);
3380 dasd_delete_device(device);
3381 } else
3382 pr_debug("dasd_generic device %s found\n",
3383 dev_name(&cdev->dev));
3384
3385 wait_event(dasd_init_waitq, _wait_for_device(device));
3386
3387 dasd_put_device(device);
3388 return rc;
3389}
3390EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3391
3392int dasd_generic_set_offline(struct ccw_device *cdev)
3393{
3394 struct dasd_device *device;
3395 struct dasd_block *block;
3396 int max_count, open_count, rc;
3397
3398 rc = 0;
3399 device = dasd_device_from_cdev(cdev);
3400 if (IS_ERR(device))
3401 return PTR_ERR(device);
3402
3403
3404
3405
3406
3407
3408
3409 if (device->block) {
3410 max_count = device->block->bdev ? 0 : -1;
3411 open_count = atomic_read(&device->block->open_count);
3412 if (open_count > max_count) {
3413 if (open_count > 0)
3414 pr_warn("%s: The DASD cannot be set offline with open count %i\n",
3415 dev_name(&cdev->dev), open_count);
3416 else
3417 pr_warn("%s: The DASD cannot be set offline while it is in use\n",
3418 dev_name(&cdev->dev));
3419 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3420 dasd_put_device(device);
3421 return -EBUSY;
3422 }
3423 }
3424
3425 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3426
3427
3428
3429
3430
3431 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3432
3433 dasd_put_device(device);
3434 return -EBUSY;
3435 } else
3436 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3437
3438 } else
3439 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
3440
3441 dasd_put_device(device);
3442 return -EBUSY;
3443 }
3444
3445
3446
3447
3448
3449
3450 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) &&
3451 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
3452
3453
3454
3455
3456
3457
3458
3459 rc = fsync_bdev(device->block->bdev);
3460 if (rc != 0)
3461 goto interrupted;
3462
3463
3464 dasd_schedule_device_bh(device);
3465 rc = wait_event_interruptible(shutdown_waitq,
3466 _wait_for_empty_queues(device));
3467 if (rc != 0)
3468 goto interrupted;
3469 }
3470
3471 set_bit(DASD_FLAG_OFFLINE, &device->flags);
3472 dasd_set_target_state(device, DASD_STATE_NEW);
3473
3474 block = device->block;
3475 dasd_delete_device(device);
3476
3477
3478
3479
3480 if (block)
3481 dasd_free_block(block);
3482 return 0;
3483
3484interrupted:
3485
3486 clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
3487 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags);
3488 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
3489 dasd_put_device(device);
3490 return rc;
3491}
3492EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3493
3494int dasd_generic_last_path_gone(struct dasd_device *device)
3495{
3496 struct dasd_ccw_req *cqr;
3497
3498 dev_warn(&device->cdev->dev, "No operational channel path is left "
3499 "for the device\n");
3500 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
3501
3502 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3503
3504 if (device->state < DASD_STATE_BASIC)
3505 return 0;
3506
3507 list_for_each_entry(cqr, &device->ccw_queue, devlist)
3508 if ((cqr->status == DASD_CQR_IN_IO) ||
3509 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
3510 cqr->status = DASD_CQR_QUEUED;
3511 cqr->retries++;
3512 }
3513 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
3514 dasd_device_clear_timer(device);
3515 dasd_schedule_device_bh(device);
3516 return 1;
3517}
3518EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
3519
3520int dasd_generic_path_operational(struct dasd_device *device)
3521{
3522 dev_info(&device->cdev->dev, "A channel path to the device has become "
3523 "operational\n");
3524 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
3525 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
3526 if (device->stopped & DASD_UNRESUMED_PM) {
3527 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
3528 dasd_restore_device(device);
3529 return 1;
3530 }
3531 dasd_schedule_device_bh(device);
3532 if (device->block)
3533 dasd_schedule_block_bh(device->block);
3534
3535 if (!device->stopped)
3536 wake_up(&generic_waitq);
3537
3538 return 1;
3539}
3540EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
3541
3542int dasd_generic_notify(struct ccw_device *cdev, int event)
3543{
3544 struct dasd_device *device;
3545 int ret;
3546
3547 device = dasd_device_from_cdev_locked(cdev);
3548 if (IS_ERR(device))
3549 return 0;
3550 ret = 0;
3551 switch (event) {
3552 case CIO_GONE:
3553 case CIO_BOXED:
3554 case CIO_NO_PATH:
3555 device->path_data.opm = 0;
3556 device->path_data.ppm = 0;
3557 device->path_data.npm = 0;
3558 ret = dasd_generic_last_path_gone(device);
3559 break;
3560 case CIO_OPER:
3561 ret = 1;
3562 if (device->path_data.opm)
3563 ret = dasd_generic_path_operational(device);
3564 break;
3565 }
3566 dasd_put_device(device);
3567 return ret;
3568}
3569EXPORT_SYMBOL_GPL(dasd_generic_notify);
3570
3571void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
3572{
3573 int chp;
3574 __u8 oldopm, eventlpm;
3575 struct dasd_device *device;
3576
3577 device = dasd_device_from_cdev_locked(cdev);
3578 if (IS_ERR(device))
3579 return;
3580 for (chp = 0; chp < 8; chp++) {
3581 eventlpm = 0x80 >> chp;
3582 if (path_event[chp] & PE_PATH_GONE) {
3583 oldopm = device->path_data.opm;
3584 device->path_data.opm &= ~eventlpm;
3585 device->path_data.ppm &= ~eventlpm;
3586 device->path_data.npm &= ~eventlpm;
3587 if (oldopm && !device->path_data.opm) {
3588 dev_warn(&device->cdev->dev,
3589 "No verified channel paths remain "
3590 "for the device\n");
3591 DBF_DEV_EVENT(DBF_WARNING, device,
3592 "%s", "last verified path gone");
3593 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
3594 dasd_device_set_stop_bits(device,
3595 DASD_STOPPED_DC_WAIT);
3596 }
3597 }
3598 if (path_event[chp] & PE_PATH_AVAILABLE) {
3599 device->path_data.opm &= ~eventlpm;
3600 device->path_data.ppm &= ~eventlpm;
3601 device->path_data.npm &= ~eventlpm;
3602 device->path_data.tbvpm |= eventlpm;
3603 dasd_schedule_device_bh(device);
3604 }
3605 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) {
3606 if (!(device->path_data.opm & eventlpm) &&
3607 !(device->path_data.tbvpm & eventlpm)) {
3608
3609
3610
3611
3612
3613 device->path_data.tbvpm |= eventlpm;
3614 dasd_schedule_device_bh(device);
3615 }
3616 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3617 "Pathgroup re-established\n");
3618 if (device->discipline->kick_validate)
3619 device->discipline->kick_validate(device);
3620 }
3621 }
3622 dasd_put_device(device);
3623}
3624EXPORT_SYMBOL_GPL(dasd_generic_path_event);
3625
3626int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
3627{
3628 if (!device->path_data.opm && lpm) {
3629 device->path_data.opm = lpm;
3630 dasd_generic_path_operational(device);
3631 } else
3632 device->path_data.opm |= lpm;
3633 return 0;
3634}
3635EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
3636
3637
3638int dasd_generic_pm_freeze(struct ccw_device *cdev)
3639{
3640 struct dasd_device *device = dasd_device_from_cdev(cdev);
3641 struct list_head freeze_queue;
3642 struct dasd_ccw_req *cqr, *n;
3643 struct dasd_ccw_req *refers;
3644 int rc;
3645
3646 if (IS_ERR(device))
3647 return PTR_ERR(device);
3648
3649
3650 set_bit(DASD_FLAG_SUSPENDED, &device->flags);
3651
3652 if (device->discipline->freeze)
3653 rc = device->discipline->freeze(device);
3654
3655
3656 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
3657
3658
3659 INIT_LIST_HEAD(&freeze_queue);
3660 spin_lock_irq(get_ccwdev_lock(cdev));
3661 rc = 0;
3662 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
3663
3664 if (cqr->status == DASD_CQR_IN_IO) {
3665 rc = device->discipline->term_IO(cqr);
3666 if (rc) {
3667
3668 dev_err(&device->cdev->dev,
3669 "Unable to terminate request %p "
3670 "on suspend\n", cqr);
3671 spin_unlock_irq(get_ccwdev_lock(cdev));
3672 dasd_put_device(device);
3673 return rc;
3674 }
3675 }
3676 list_move_tail(&cqr->devlist, &freeze_queue);
3677 }
3678 spin_unlock_irq(get_ccwdev_lock(cdev));
3679
3680 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
3681 wait_event(dasd_flush_wq,
3682 (cqr->status != DASD_CQR_CLEAR_PENDING));
3683 if (cqr->status == DASD_CQR_CLEARED)
3684 cqr->status = DASD_CQR_QUEUED;
3685
3686
3687
3688 if (_dasd_requeue_request(cqr))
3689 continue;
3690
3691
3692 list_del_init(&cqr->devlist);
3693 while (cqr->refers != NULL) {
3694 refers = cqr->refers;
3695
3696 list_del(&cqr->blocklist);
3697
3698 dasd_free_erp_request(cqr, cqr->memdev);
3699 cqr = refers;
3700 }
3701 if (cqr->block)
3702 list_del_init(&cqr->blocklist);
3703 cqr->block->base->discipline->free_cp(
3704 cqr, (struct request *) cqr->callback_data);
3705 }
3706
3707
3708
3709
3710
3711 if (!list_empty(&freeze_queue)) {
3712
3713 spin_lock_irq(get_ccwdev_lock(cdev));
3714 list_splice_tail(&freeze_queue, &device->ccw_queue);
3715 spin_unlock_irq(get_ccwdev_lock(cdev));
3716 }
3717 dasd_put_device(device);
3718 return rc;
3719}
3720EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
3721
3722int dasd_generic_restore_device(struct ccw_device *cdev)
3723{
3724 struct dasd_device *device = dasd_device_from_cdev(cdev);
3725 int rc = 0;
3726
3727 if (IS_ERR(device))
3728 return PTR_ERR(device);
3729
3730
3731 dasd_device_remove_stop_bits(device,
3732 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
3733
3734 dasd_schedule_device_bh(device);
3735
3736
3737
3738
3739
3740 if (device->discipline->restore && !(device->stopped))
3741 rc = device->discipline->restore(device);
3742 if (rc || device->stopped)
3743
3744
3745
3746
3747 device->stopped |= DASD_UNRESUMED_PM;
3748
3749 if (device->block)
3750 dasd_schedule_block_bh(device->block);
3751
3752 clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
3753 dasd_put_device(device);
3754 return 0;
3755}
3756EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
3757
3758static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
3759 void *rdc_buffer,
3760 int rdc_buffer_size,
3761 int magic)
3762{
3763 struct dasd_ccw_req *cqr;
3764 struct ccw1 *ccw;
3765 unsigned long *idaw;
3766
3767 cqr = dasd_smalloc_request(magic, 1 , rdc_buffer_size, device);
3768
3769 if (IS_ERR(cqr)) {
3770
3771 dev_err(&device->cdev->dev,
3772 "An error occurred in the DASD device driver, "
3773 "reason=%s\n", "13");
3774 return cqr;
3775 }
3776
3777 ccw = cqr->cpaddr;
3778 ccw->cmd_code = CCW_CMD_RDC;
3779 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
3780 idaw = (unsigned long *) (cqr->data);
3781 ccw->cda = (__u32)(addr_t) idaw;
3782 ccw->flags = CCW_FLAG_IDA;
3783 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
3784 } else {
3785 ccw->cda = (__u32)(addr_t) rdc_buffer;
3786 ccw->flags = 0;
3787 }
3788
3789 ccw->count = rdc_buffer_size;
3790 cqr->startdev = device;
3791 cqr->memdev = device;
3792 cqr->expires = 10*HZ;
3793 cqr->retries = 256;
3794 cqr->buildclk = get_tod_clock();
3795 cqr->status = DASD_CQR_FILLED;
3796 return cqr;
3797}
3798
3799
3800int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
3801 void *rdc_buffer, int rdc_buffer_size)
3802{
3803 int ret;
3804 struct dasd_ccw_req *cqr;
3805
3806 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
3807 magic);
3808 if (IS_ERR(cqr))
3809 return PTR_ERR(cqr);
3810
3811 ret = dasd_sleep_on(cqr);
3812 dasd_sfree_request(cqr, cqr->memdev);
3813 return ret;
3814}
3815EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
3816
3817
3818
3819
3820
3821
3822
3823char *dasd_get_sense(struct irb *irb)
3824{
3825 struct tsb *tsb = NULL;
3826 char *sense = NULL;
3827
3828 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
3829 if (irb->scsw.tm.tcw)
3830 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
3831 irb->scsw.tm.tcw);
3832 if (tsb && tsb->length == 64 && tsb->flags)
3833 switch (tsb->flags & 0x07) {
3834 case 1:
3835 sense = tsb->tsa.iostat.sense;
3836 break;
3837 case 2:
3838 sense = tsb->tsa.ddpc.sense;
3839 break;
3840 default:
3841
3842 break;
3843 }
3844 } else if (irb->esw.esw0.erw.cons) {
3845 sense = irb->ecw;
3846 }
3847 return sense;
3848}
3849EXPORT_SYMBOL_GPL(dasd_get_sense);
3850
3851void dasd_generic_shutdown(struct ccw_device *cdev)
3852{
3853 struct dasd_device *device;
3854
3855 device = dasd_device_from_cdev(cdev);
3856 if (IS_ERR(device))
3857 return;
3858
3859 if (device->block)
3860 dasd_schedule_block_bh(device->block);
3861
3862 dasd_schedule_device_bh(device);
3863
3864 wait_event(shutdown_waitq, _wait_for_empty_queues(device));
3865}
3866EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
3867
3868static int __init dasd_init(void)
3869{
3870 int rc;
3871
3872 init_waitqueue_head(&dasd_init_waitq);
3873 init_waitqueue_head(&dasd_flush_wq);
3874 init_waitqueue_head(&generic_waitq);
3875 init_waitqueue_head(&shutdown_waitq);
3876
3877
3878 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
3879 if (dasd_debug_area == NULL) {
3880 rc = -ENOMEM;
3881 goto failed;
3882 }
3883 debug_register_view(dasd_debug_area, &debug_sprintf_view);
3884 debug_set_level(dasd_debug_area, DBF_WARNING);
3885
3886 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
3887
3888 dasd_diag_discipline_pointer = NULL;
3889
3890 dasd_statistics_createroot();
3891
3892 rc = dasd_devmap_init();
3893 if (rc)
3894 goto failed;
3895 rc = dasd_gendisk_init();
3896 if (rc)
3897 goto failed;
3898 rc = dasd_parse();
3899 if (rc)
3900 goto failed;
3901 rc = dasd_eer_init();
3902 if (rc)
3903 goto failed;
3904#ifdef CONFIG_PROC_FS
3905 rc = dasd_proc_init();
3906 if (rc)
3907 goto failed;
3908#endif
3909
3910 return 0;
3911failed:
3912 pr_info("The DASD device driver could not be initialized\n");
3913 dasd_exit();
3914 return rc;
3915}
3916
3917module_init(dasd_init);
3918module_exit(dasd_exit);
3919