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