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9
10
11#define KMSG_COMPONENT "dasd"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/kernel_stat.h>
15#include <linux/kmod.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/ctype.h>
19#include <linux/major.h>
20#include <linux/slab.h>
21#include <linux/buffer_head.h>
22#include <linux/hdreg.h>
23#include <linux/async.h>
24#include <linux/mutex.h>
25
26#include <asm/ccwdev.h>
27#include <asm/ebcdic.h>
28#include <asm/idals.h>
29#include <asm/itcw.h>
30#include <asm/diag.h>
31
32
33#define PRINTK_HEADER "dasd:"
34
35#include "dasd_int.h"
36
37
38
39#define DASD_CHANQ_MAX_SIZE 4
40
41#define DASD_SLEEPON_START_TAG (void *) 1
42#define DASD_SLEEPON_END_TAG (void *) 2
43
44
45
46
47debug_info_t *dasd_debug_area;
48struct dasd_discipline *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 2000 IBM Corporation");
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 *);
74
75
76
77
78static wait_queue_head_t dasd_init_waitq;
79static wait_queue_head_t dasd_flush_wq;
80static wait_queue_head_t generic_waitq;
81
82
83
84
85struct dasd_device *dasd_alloc_device(void)
86{
87 struct dasd_device *device;
88
89 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC);
90 if (!device)
91 return ERR_PTR(-ENOMEM);
92
93
94 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1);
95 if (!device->ccw_mem) {
96 kfree(device);
97 return ERR_PTR(-ENOMEM);
98 }
99
100 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA);
101 if (!device->erp_mem) {
102 free_pages((unsigned long) device->ccw_mem, 1);
103 kfree(device);
104 return ERR_PTR(-ENOMEM);
105 }
106
107 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2);
108 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE);
109 spin_lock_init(&device->mem_lock);
110 atomic_set(&device->tasklet_scheduled, 0);
111 tasklet_init(&device->tasklet,
112 (void (*)(unsigned long)) dasd_device_tasklet,
113 (unsigned long) device);
114 INIT_LIST_HEAD(&device->ccw_queue);
115 init_timer(&device->timer);
116 device->timer.function = dasd_device_timeout;
117 device->timer.data = (unsigned long) device;
118 INIT_WORK(&device->kick_work, do_kick_device);
119 INIT_WORK(&device->restore_device, do_restore_device);
120 INIT_WORK(&device->reload_device, do_reload_device);
121 device->state = DASD_STATE_NEW;
122 device->target = DASD_STATE_NEW;
123 mutex_init(&device->state_mutex);
124
125 return device;
126}
127
128
129
130
131void dasd_free_device(struct dasd_device *device)
132{
133 kfree(device->private);
134 free_page((unsigned long) device->erp_mem);
135 free_pages((unsigned long) device->ccw_mem, 1);
136 kfree(device);
137}
138
139
140
141
142struct dasd_block *dasd_alloc_block(void)
143{
144 struct dasd_block *block;
145
146 block = kzalloc(sizeof(*block), GFP_ATOMIC);
147 if (!block)
148 return ERR_PTR(-ENOMEM);
149
150 atomic_set(&block->open_count, -1);
151
152 spin_lock_init(&block->request_queue_lock);
153 atomic_set(&block->tasklet_scheduled, 0);
154 tasklet_init(&block->tasklet,
155 (void (*)(unsigned long)) dasd_block_tasklet,
156 (unsigned long) block);
157 INIT_LIST_HEAD(&block->ccw_queue);
158 spin_lock_init(&block->queue_lock);
159 init_timer(&block->timer);
160 block->timer.function = dasd_block_timeout;
161 block->timer.data = (unsigned long) block;
162
163 return block;
164}
165
166
167
168
169void dasd_free_block(struct dasd_block *block)
170{
171 kfree(block);
172}
173
174
175
176
177static int dasd_state_new_to_known(struct dasd_device *device)
178{
179 int rc;
180
181
182
183
184
185 dasd_get_device(device);
186
187 if (device->block) {
188 rc = dasd_alloc_queue(device->block);
189 if (rc) {
190 dasd_put_device(device);
191 return rc;
192 }
193 }
194 device->state = DASD_STATE_KNOWN;
195 return 0;
196}
197
198
199
200
201static int dasd_state_known_to_new(struct dasd_device *device)
202{
203
204 dasd_eer_disable(device);
205
206 if (device->discipline) {
207 if (device->discipline->uncheck_device)
208 device->discipline->uncheck_device(device);
209 module_put(device->discipline->owner);
210 }
211 device->discipline = NULL;
212 if (device->base_discipline)
213 module_put(device->base_discipline->owner);
214 device->base_discipline = NULL;
215 device->state = DASD_STATE_NEW;
216
217 if (device->block)
218 dasd_free_queue(device->block);
219
220
221 dasd_put_device(device);
222 return 0;
223}
224
225
226
227
228static int dasd_state_known_to_basic(struct dasd_device *device)
229{
230 int rc;
231
232
233 if (device->block) {
234 rc = dasd_gendisk_alloc(device->block);
235 if (rc)
236 return rc;
237 }
238
239 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1,
240 8 * sizeof(long));
241 debug_register_view(device->debug_area, &debug_sprintf_view);
242 debug_set_level(device->debug_area, DBF_WARNING);
243 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created");
244
245 device->state = DASD_STATE_BASIC;
246 return 0;
247}
248
249
250
251
252static int dasd_state_basic_to_known(struct dasd_device *device)
253{
254 int rc;
255 if (device->block) {
256 dasd_gendisk_free(device->block);
257 dasd_block_clear_timer(device->block);
258 }
259 rc = dasd_flush_device_queue(device);
260 if (rc)
261 return rc;
262 dasd_device_clear_timer(device);
263
264 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device);
265 if (device->debug_area != NULL) {
266 debug_unregister(device->debug_area);
267 device->debug_area = NULL;
268 }
269 device->state = DASD_STATE_KNOWN;
270 return 0;
271}
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287static int dasd_state_basic_to_ready(struct dasd_device *device)
288{
289 int rc;
290 struct dasd_block *block;
291
292 rc = 0;
293 block = device->block;
294
295 if (block) {
296 if (block->base->discipline->do_analysis != NULL)
297 rc = block->base->discipline->do_analysis(block);
298 if (rc) {
299 if (rc != -EAGAIN)
300 device->state = DASD_STATE_UNFMT;
301 return rc;
302 }
303 dasd_setup_queue(block);
304 set_capacity(block->gdp,
305 block->blocks << block->s2b_shift);
306 device->state = DASD_STATE_READY;
307 rc = dasd_scan_partitions(block);
308 if (rc)
309 device->state = DASD_STATE_BASIC;
310 } else {
311 device->state = DASD_STATE_READY;
312 }
313 return rc;
314}
315
316
317
318
319
320
321static int dasd_state_ready_to_basic(struct dasd_device *device)
322{
323 int rc;
324
325 device->state = DASD_STATE_BASIC;
326 if (device->block) {
327 struct dasd_block *block = device->block;
328 rc = dasd_flush_block_queue(block);
329 if (rc) {
330 device->state = DASD_STATE_READY;
331 return rc;
332 }
333 dasd_flush_request_queue(block);
334 dasd_destroy_partitions(block);
335 block->blocks = 0;
336 block->bp_block = 0;
337 block->s2b_shift = 0;
338 }
339 return 0;
340}
341
342
343
344
345static int dasd_state_unfmt_to_basic(struct dasd_device *device)
346{
347 device->state = DASD_STATE_BASIC;
348 return 0;
349}
350
351
352
353
354
355
356static int
357dasd_state_ready_to_online(struct dasd_device * device)
358{
359 int rc;
360 struct gendisk *disk;
361 struct disk_part_iter piter;
362 struct hd_struct *part;
363
364 if (device->discipline->ready_to_online) {
365 rc = device->discipline->ready_to_online(device);
366 if (rc)
367 return rc;
368 }
369 device->state = DASD_STATE_ONLINE;
370 if (device->block) {
371 dasd_schedule_block_bh(device->block);
372 if ((device->features & DASD_FEATURE_USERAW)) {
373 disk = device->block->gdp;
374 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
375 return 0;
376 }
377 disk = device->block->bdev->bd_disk;
378 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
379 while ((part = disk_part_iter_next(&piter)))
380 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
381 disk_part_iter_exit(&piter);
382 }
383 return 0;
384}
385
386
387
388
389static int dasd_state_online_to_ready(struct dasd_device *device)
390{
391 int rc;
392 struct gendisk *disk;
393 struct disk_part_iter piter;
394 struct hd_struct *part;
395
396 if (device->discipline->online_to_ready) {
397 rc = device->discipline->online_to_ready(device);
398 if (rc)
399 return rc;
400 }
401 device->state = DASD_STATE_READY;
402 if (device->block && !(device->features & DASD_FEATURE_USERAW)) {
403 disk = device->block->bdev->bd_disk;
404 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
405 while ((part = disk_part_iter_next(&piter)))
406 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE);
407 disk_part_iter_exit(&piter);
408 }
409 return 0;
410}
411
412
413
414
415static int dasd_increase_state(struct dasd_device *device)
416{
417 int rc;
418
419 rc = 0;
420 if (device->state == DASD_STATE_NEW &&
421 device->target >= DASD_STATE_KNOWN)
422 rc = dasd_state_new_to_known(device);
423
424 if (!rc &&
425 device->state == DASD_STATE_KNOWN &&
426 device->target >= DASD_STATE_BASIC)
427 rc = dasd_state_known_to_basic(device);
428
429 if (!rc &&
430 device->state == DASD_STATE_BASIC &&
431 device->target >= DASD_STATE_READY)
432 rc = dasd_state_basic_to_ready(device);
433
434 if (!rc &&
435 device->state == DASD_STATE_UNFMT &&
436 device->target > DASD_STATE_UNFMT)
437 rc = -EPERM;
438
439 if (!rc &&
440 device->state == DASD_STATE_READY &&
441 device->target >= DASD_STATE_ONLINE)
442 rc = dasd_state_ready_to_online(device);
443
444 return rc;
445}
446
447
448
449
450static int dasd_decrease_state(struct dasd_device *device)
451{
452 int rc;
453
454 rc = 0;
455 if (device->state == DASD_STATE_ONLINE &&
456 device->target <= DASD_STATE_READY)
457 rc = dasd_state_online_to_ready(device);
458
459 if (!rc &&
460 device->state == DASD_STATE_READY &&
461 device->target <= DASD_STATE_BASIC)
462 rc = dasd_state_ready_to_basic(device);
463
464 if (!rc &&
465 device->state == DASD_STATE_UNFMT &&
466 device->target <= DASD_STATE_BASIC)
467 rc = dasd_state_unfmt_to_basic(device);
468
469 if (!rc &&
470 device->state == DASD_STATE_BASIC &&
471 device->target <= DASD_STATE_KNOWN)
472 rc = dasd_state_basic_to_known(device);
473
474 if (!rc &&
475 device->state == DASD_STATE_KNOWN &&
476 device->target <= DASD_STATE_NEW)
477 rc = dasd_state_known_to_new(device);
478
479 return rc;
480}
481
482
483
484
485static void dasd_change_state(struct dasd_device *device)
486{
487 int rc;
488
489 if (device->state == device->target)
490
491 return;
492 if (device->state < device->target)
493 rc = dasd_increase_state(device);
494 else
495 rc = dasd_decrease_state(device);
496 if (rc == -EAGAIN)
497 return;
498 if (rc)
499 device->target = device->state;
500
501 if (device->state == device->target)
502 wake_up(&dasd_init_waitq);
503
504
505 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
506}
507
508
509
510
511
512
513
514static void do_kick_device(struct work_struct *work)
515{
516 struct dasd_device *device = container_of(work, struct dasd_device, kick_work);
517 mutex_lock(&device->state_mutex);
518 dasd_change_state(device);
519 mutex_unlock(&device->state_mutex);
520 dasd_schedule_device_bh(device);
521 dasd_put_device(device);
522}
523
524void dasd_kick_device(struct dasd_device *device)
525{
526 dasd_get_device(device);
527
528 schedule_work(&device->kick_work);
529}
530
531
532
533
534
535static void do_reload_device(struct work_struct *work)
536{
537 struct dasd_device *device = container_of(work, struct dasd_device,
538 reload_device);
539 device->discipline->reload(device);
540 dasd_put_device(device);
541}
542
543void dasd_reload_device(struct dasd_device *device)
544{
545 dasd_get_device(device);
546
547 schedule_work(&device->reload_device);
548}
549EXPORT_SYMBOL(dasd_reload_device);
550
551
552
553
554
555static void do_restore_device(struct work_struct *work)
556{
557 struct dasd_device *device = container_of(work, struct dasd_device,
558 restore_device);
559 device->cdev->drv->restore(device->cdev);
560 dasd_put_device(device);
561}
562
563void dasd_restore_device(struct dasd_device *device)
564{
565 dasd_get_device(device);
566
567 schedule_work(&device->restore_device);
568}
569
570
571
572
573void dasd_set_target_state(struct dasd_device *device, int target)
574{
575 dasd_get_device(device);
576 mutex_lock(&device->state_mutex);
577
578 if (dasd_probeonly && target > DASD_STATE_READY)
579 target = DASD_STATE_READY;
580 if (device->target != target) {
581 if (device->state == target)
582 wake_up(&dasd_init_waitq);
583 device->target = target;
584 }
585 if (device->state != device->target)
586 dasd_change_state(device);
587 mutex_unlock(&device->state_mutex);
588 dasd_put_device(device);
589}
590
591
592
593
594static inline int _wait_for_device(struct dasd_device *device)
595{
596 return (device->state == device->target);
597}
598
599void dasd_enable_device(struct dasd_device *device)
600{
601 dasd_set_target_state(device, DASD_STATE_ONLINE);
602 if (device->state <= DASD_STATE_KNOWN)
603
604 dasd_set_target_state(device, DASD_STATE_NEW);
605
606 wait_event(dasd_init_waitq, _wait_for_device(device));
607}
608
609
610
611
612#ifdef CONFIG_DASD_PROFILE
613
614struct dasd_profile_info_t dasd_global_profile;
615unsigned int dasd_profile_level = DASD_PROFILE_OFF;
616
617
618
619
620#define dasd_profile_counter(value, counter, block) \
621{ \
622 int index; \
623 for (index = 0; index < 31 && value >> (2+index); index++); \
624 dasd_global_profile.counter[index]++; \
625 block->profile.counter[index]++; \
626}
627
628
629
630
631static void dasd_profile_start(struct dasd_block *block,
632 struct dasd_ccw_req *cqr,
633 struct request *req)
634{
635 struct list_head *l;
636 unsigned int counter;
637
638 if (dasd_profile_level != DASD_PROFILE_ON)
639 return;
640
641
642 counter = 0;
643 list_for_each(l, &block->ccw_queue)
644 if (++counter >= 31)
645 break;
646 dasd_global_profile.dasd_io_nr_req[counter]++;
647 block->profile.dasd_io_nr_req[counter]++;
648}
649
650
651
652
653static void dasd_profile_end(struct dasd_block *block,
654 struct dasd_ccw_req *cqr,
655 struct request *req)
656{
657 long strtime, irqtime, endtime, tottime;
658 long tottimeps, sectors;
659
660 if (dasd_profile_level != DASD_PROFILE_ON)
661 return;
662
663 sectors = blk_rq_sectors(req);
664 if (!cqr->buildclk || !cqr->startclk ||
665 !cqr->stopclk || !cqr->endclk ||
666 !sectors)
667 return;
668
669 strtime = ((cqr->startclk - cqr->buildclk) >> 12);
670 irqtime = ((cqr->stopclk - cqr->startclk) >> 12);
671 endtime = ((cqr->endclk - cqr->stopclk) >> 12);
672 tottime = ((cqr->endclk - cqr->buildclk) >> 12);
673 tottimeps = tottime / sectors;
674
675 if (!dasd_global_profile.dasd_io_reqs)
676 memset(&dasd_global_profile, 0,
677 sizeof(struct dasd_profile_info_t));
678 dasd_global_profile.dasd_io_reqs++;
679 dasd_global_profile.dasd_io_sects += sectors;
680
681 if (!block->profile.dasd_io_reqs)
682 memset(&block->profile, 0,
683 sizeof(struct dasd_profile_info_t));
684 block->profile.dasd_io_reqs++;
685 block->profile.dasd_io_sects += sectors;
686
687 dasd_profile_counter(sectors, dasd_io_secs, block);
688 dasd_profile_counter(tottime, dasd_io_times, block);
689 dasd_profile_counter(tottimeps, dasd_io_timps, block);
690 dasd_profile_counter(strtime, dasd_io_time1, block);
691 dasd_profile_counter(irqtime, dasd_io_time2, block);
692 dasd_profile_counter(irqtime / sectors, dasd_io_time2ps, block);
693 dasd_profile_counter(endtime, dasd_io_time3, block);
694}
695#else
696#define dasd_profile_start(block, cqr, req) do {} while (0)
697#define dasd_profile_end(block, cqr, req) do {} while (0)
698#endif
699
700
701
702
703
704
705
706
707struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
708 int datasize,
709 struct dasd_device *device)
710{
711 struct dasd_ccw_req *cqr;
712
713
714 BUG_ON(datasize > PAGE_SIZE ||
715 (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
716
717 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
718 if (cqr == NULL)
719 return ERR_PTR(-ENOMEM);
720 cqr->cpaddr = NULL;
721 if (cplength > 0) {
722 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
723 GFP_ATOMIC | GFP_DMA);
724 if (cqr->cpaddr == NULL) {
725 kfree(cqr);
726 return ERR_PTR(-ENOMEM);
727 }
728 }
729 cqr->data = NULL;
730 if (datasize > 0) {
731 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
732 if (cqr->data == NULL) {
733 kfree(cqr->cpaddr);
734 kfree(cqr);
735 return ERR_PTR(-ENOMEM);
736 }
737 }
738 cqr->magic = magic;
739 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
740 dasd_get_device(device);
741 return cqr;
742}
743
744struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
745 int datasize,
746 struct dasd_device *device)
747{
748 unsigned long flags;
749 struct dasd_ccw_req *cqr;
750 char *data;
751 int size;
752
753 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
754 if (cplength > 0)
755 size += cplength * sizeof(struct ccw1);
756 if (datasize > 0)
757 size += datasize;
758 spin_lock_irqsave(&device->mem_lock, flags);
759 cqr = (struct dasd_ccw_req *)
760 dasd_alloc_chunk(&device->ccw_chunks, size);
761 spin_unlock_irqrestore(&device->mem_lock, flags);
762 if (cqr == NULL)
763 return ERR_PTR(-ENOMEM);
764 memset(cqr, 0, sizeof(struct dasd_ccw_req));
765 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
766 cqr->cpaddr = NULL;
767 if (cplength > 0) {
768 cqr->cpaddr = (struct ccw1 *) data;
769 data += cplength*sizeof(struct ccw1);
770 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
771 }
772 cqr->data = NULL;
773 if (datasize > 0) {
774 cqr->data = data;
775 memset(cqr->data, 0, datasize);
776 }
777 cqr->magic = magic;
778 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
779 dasd_get_device(device);
780 return cqr;
781}
782
783
784
785
786
787
788void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
789{
790#ifdef CONFIG_64BIT
791 struct ccw1 *ccw;
792
793
794 ccw = cqr->cpaddr;
795 do {
796 clear_normalized_cda(ccw);
797 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
798#endif
799 kfree(cqr->cpaddr);
800 kfree(cqr->data);
801 kfree(cqr);
802 dasd_put_device(device);
803}
804
805void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
806{
807 unsigned long flags;
808
809 spin_lock_irqsave(&device->mem_lock, flags);
810 dasd_free_chunk(&device->ccw_chunks, cqr);
811 spin_unlock_irqrestore(&device->mem_lock, flags);
812 dasd_put_device(device);
813}
814
815
816
817
818static inline int dasd_check_cqr(struct dasd_ccw_req *cqr)
819{
820 struct dasd_device *device;
821
822 if (cqr == NULL)
823 return -EINVAL;
824 device = cqr->startdev;
825 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) {
826 DBF_DEV_EVENT(DBF_WARNING, device,
827 " dasd_ccw_req 0x%08x magic doesn't match"
828 " discipline 0x%08x",
829 cqr->magic,
830 *(unsigned int *) device->discipline->name);
831 return -EINVAL;
832 }
833 return 0;
834}
835
836
837
838
839
840
841
842int dasd_term_IO(struct dasd_ccw_req *cqr)
843{
844 struct dasd_device *device;
845 int retries, rc;
846 char errorstring[ERRORLENGTH];
847
848
849 rc = dasd_check_cqr(cqr);
850 if (rc)
851 return rc;
852 retries = 0;
853 device = (struct dasd_device *) cqr->startdev;
854 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) {
855 rc = ccw_device_clear(device->cdev, (long) cqr);
856 switch (rc) {
857 case 0:
858 cqr->status = DASD_CQR_CLEAR_PENDING;
859 cqr->stopclk = get_clock();
860 cqr->starttime = 0;
861 DBF_DEV_EVENT(DBF_DEBUG, device,
862 "terminate cqr %p successful",
863 cqr);
864 break;
865 case -ENODEV:
866 DBF_DEV_EVENT(DBF_ERR, device, "%s",
867 "device gone, retry");
868 break;
869 case -EIO:
870 DBF_DEV_EVENT(DBF_ERR, device, "%s",
871 "I/O error, retry");
872 break;
873 case -EINVAL:
874 case -EBUSY:
875 DBF_DEV_EVENT(DBF_ERR, device, "%s",
876 "device busy, retry later");
877 break;
878 default:
879
880 snprintf(errorstring, ERRORLENGTH, "10 %d", rc);
881 dev_err(&device->cdev->dev, "An error occurred in the "
882 "DASD device driver, reason=%s\n", errorstring);
883 BUG();
884 break;
885 }
886 retries++;
887 }
888 dasd_schedule_device_bh(device);
889 return rc;
890}
891
892
893
894
895
896int dasd_start_IO(struct dasd_ccw_req *cqr)
897{
898 struct dasd_device *device;
899 int rc;
900 char errorstring[ERRORLENGTH];
901
902
903 rc = dasd_check_cqr(cqr);
904 if (rc) {
905 cqr->intrc = rc;
906 return rc;
907 }
908 device = (struct dasd_device *) cqr->startdev;
909 if (((cqr->block &&
910 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) ||
911 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) &&
912 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
913 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p "
914 "because of stolen lock", cqr);
915 cqr->status = DASD_CQR_ERROR;
916 cqr->intrc = -EPERM;
917 return -EPERM;
918 }
919 if (cqr->retries < 0) {
920
921 sprintf(errorstring, "14 %p", cqr);
922 dev_err(&device->cdev->dev, "An error occurred in the DASD "
923 "device driver, reason=%s\n", errorstring);
924 cqr->status = DASD_CQR_ERROR;
925 return -EIO;
926 }
927 cqr->startclk = get_clock();
928 cqr->starttime = jiffies;
929 cqr->retries--;
930 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
931 cqr->lpm &= device->path_data.opm;
932 if (!cqr->lpm)
933 cqr->lpm = device->path_data.opm;
934 }
935 if (cqr->cpmode == 1) {
936 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
937 (long) cqr, cqr->lpm);
938 } else {
939 rc = ccw_device_start(device->cdev, cqr->cpaddr,
940 (long) cqr, cqr->lpm, 0);
941 }
942 switch (rc) {
943 case 0:
944 cqr->status = DASD_CQR_IN_IO;
945 break;
946 case -EBUSY:
947 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
948 "start_IO: device busy, retry later");
949 break;
950 case -ETIMEDOUT:
951 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
952 "start_IO: request timeout, retry later");
953 break;
954 case -EACCES:
955
956
957
958
959
960
961
962 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
963 DBF_DEV_EVENT(DBF_WARNING, device,
964 "start_IO: selected paths gone (%x)",
965 cqr->lpm);
966 } else if (cqr->lpm != device->path_data.opm) {
967 cqr->lpm = device->path_data.opm;
968 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
969 "start_IO: selected paths gone,"
970 " retry on all paths");
971 } else {
972 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
973 "start_IO: all paths in opm gone,"
974 " do path verification");
975 dasd_generic_last_path_gone(device);
976 device->path_data.opm = 0;
977 device->path_data.ppm = 0;
978 device->path_data.npm = 0;
979 device->path_data.tbvpm =
980 ccw_device_get_path_mask(device->cdev);
981 }
982 break;
983 case -ENODEV:
984 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
985 "start_IO: -ENODEV device gone, retry");
986 break;
987 case -EIO:
988 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
989 "start_IO: -EIO device gone, retry");
990 break;
991 case -EINVAL:
992
993 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
994 "start_IO: -EINVAL device currently "
995 "not accessible");
996 break;
997 default:
998
999 snprintf(errorstring, ERRORLENGTH, "11 %d", rc);
1000 dev_err(&device->cdev->dev,
1001 "An error occurred in the DASD device driver, "
1002 "reason=%s\n", errorstring);
1003 BUG();
1004 break;
1005 }
1006 cqr->intrc = rc;
1007 return rc;
1008}
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018static void dasd_device_timeout(unsigned long ptr)
1019{
1020 unsigned long flags;
1021 struct dasd_device *device;
1022
1023 device = (struct dasd_device *) ptr;
1024 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1025
1026 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1027 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1028 dasd_schedule_device_bh(device);
1029}
1030
1031
1032
1033
1034void dasd_device_set_timer(struct dasd_device *device, int expires)
1035{
1036 if (expires == 0)
1037 del_timer(&device->timer);
1038 else
1039 mod_timer(&device->timer, jiffies + expires);
1040}
1041
1042
1043
1044
1045void dasd_device_clear_timer(struct dasd_device *device)
1046{
1047 del_timer(&device->timer);
1048}
1049
1050static void dasd_handle_killed_request(struct ccw_device *cdev,
1051 unsigned long intparm)
1052{
1053 struct dasd_ccw_req *cqr;
1054 struct dasd_device *device;
1055
1056 if (!intparm)
1057 return;
1058 cqr = (struct dasd_ccw_req *) intparm;
1059 if (cqr->status != DASD_CQR_IN_IO) {
1060 DBF_EVENT_DEVID(DBF_DEBUG, cdev,
1061 "invalid status in handle_killed_request: "
1062 "%02x", cqr->status);
1063 return;
1064 }
1065
1066 device = dasd_device_from_cdev_locked(cdev);
1067 if (IS_ERR(device)) {
1068 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1069 "unable to get device from cdev");
1070 return;
1071 }
1072
1073 if (!cqr->startdev ||
1074 device != cqr->startdev ||
1075 strncmp(cqr->startdev->discipline->ebcname,
1076 (char *) &cqr->magic, 4)) {
1077 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1078 "invalid device in request");
1079 dasd_put_device(device);
1080 return;
1081 }
1082
1083
1084 cqr->status = DASD_CQR_QUEUED;
1085
1086 dasd_device_clear_timer(device);
1087 dasd_schedule_device_bh(device);
1088 dasd_put_device(device);
1089}
1090
1091void dasd_generic_handle_state_change(struct dasd_device *device)
1092{
1093
1094 dasd_eer_snss(device);
1095
1096 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING);
1097 dasd_schedule_device_bh(device);
1098 if (device->block)
1099 dasd_schedule_block_bh(device->block);
1100}
1101
1102
1103
1104
1105void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
1106 struct irb *irb)
1107{
1108 struct dasd_ccw_req *cqr, *next;
1109 struct dasd_device *device;
1110 unsigned long long now;
1111 int expires;
1112
1113 kstat_cpu(smp_processor_id()).irqs[IOINT_DAS]++;
1114 if (IS_ERR(irb)) {
1115 switch (PTR_ERR(irb)) {
1116 case -EIO:
1117 break;
1118 case -ETIMEDOUT:
1119 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1120 "request timed out\n", __func__);
1121 break;
1122 default:
1123 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
1124 "unknown error %ld\n", __func__,
1125 PTR_ERR(irb));
1126 }
1127 dasd_handle_killed_request(cdev, intparm);
1128 return;
1129 }
1130
1131 now = get_clock();
1132 cqr = (struct dasd_ccw_req *) intparm;
1133
1134 if (!cqr ||
1135 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1136 scsw_cstat(&irb->scsw) == 0)) {
1137 if (cqr)
1138 memcpy(&cqr->irb, irb, sizeof(*irb));
1139 device = dasd_device_from_cdev_locked(cdev);
1140 if (IS_ERR(device))
1141 return;
1142
1143 if (device->discipline == dasd_diag_discipline_pointer) {
1144 dasd_put_device(device);
1145 return;
1146 }
1147 device->discipline->dump_sense_dbf(device, irb, "int");
1148 if (device->features & DASD_FEATURE_ERPLOG)
1149 device->discipline->dump_sense(device, cqr, irb);
1150 device->discipline->check_for_device_change(device, cqr, irb);
1151 dasd_put_device(device);
1152 }
1153 if (!cqr)
1154 return;
1155
1156 device = (struct dasd_device *) cqr->startdev;
1157 if (!device ||
1158 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
1159 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s",
1160 "invalid device in request");
1161 return;
1162 }
1163
1164
1165 if (cqr->status == DASD_CQR_CLEAR_PENDING &&
1166 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
1167 cqr->status = DASD_CQR_CLEARED;
1168 dasd_device_clear_timer(device);
1169 wake_up(&dasd_flush_wq);
1170 dasd_schedule_device_bh(device);
1171 return;
1172 }
1173
1174
1175 if (cqr->status != DASD_CQR_IN_IO) {
1176 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, "
1177 "status %02x", dev_name(&cdev->dev), cqr->status);
1178 return;
1179 }
1180
1181 next = NULL;
1182 expires = 0;
1183 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
1184 scsw_cstat(&irb->scsw) == 0) {
1185
1186 cqr->status = DASD_CQR_SUCCESS;
1187 cqr->stopclk = now;
1188
1189 if (cqr->devlist.next != &device->ccw_queue) {
1190 next = list_entry(cqr->devlist.next,
1191 struct dasd_ccw_req, devlist);
1192 }
1193 } else {
1194
1195
1196
1197
1198 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
1199 cqr->retries > 0) {
1200 if (cqr->lpm == device->path_data.opm)
1201 DBF_DEV_EVENT(DBF_DEBUG, device,
1202 "default ERP in fastpath "
1203 "(%i retries left)",
1204 cqr->retries);
1205 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
1206 cqr->lpm = device->path_data.opm;
1207 cqr->status = DASD_CQR_QUEUED;
1208 next = cqr;
1209 } else
1210 cqr->status = DASD_CQR_ERROR;
1211 }
1212 if (next && (next->status == DASD_CQR_QUEUED) &&
1213 (!device->stopped)) {
1214 if (device->discipline->start_IO(next) == 0)
1215 expires = next->expires;
1216 }
1217 if (expires != 0)
1218 dasd_device_set_timer(device, expires);
1219 else
1220 dasd_device_clear_timer(device);
1221 dasd_schedule_device_bh(device);
1222}
1223
1224enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
1225{
1226 struct dasd_device *device;
1227
1228 device = dasd_device_from_cdev_locked(cdev);
1229
1230 if (IS_ERR(device))
1231 goto out;
1232 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1233 device->state != device->target ||
1234 !device->discipline->check_for_device_change){
1235 dasd_put_device(device);
1236 goto out;
1237 }
1238 if (device->discipline->dump_sense_dbf)
1239 device->discipline->dump_sense_dbf(device, irb, "uc");
1240 device->discipline->check_for_device_change(device, NULL, irb);
1241 dasd_put_device(device);
1242out:
1243 return UC_TODO_RETRY;
1244}
1245EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
1246
1247
1248
1249
1250
1251static void __dasd_device_recovery(struct dasd_device *device,
1252 struct dasd_ccw_req *ref_cqr)
1253{
1254 struct list_head *l, *n;
1255 struct dasd_ccw_req *cqr;
1256
1257
1258
1259
1260 if (!ref_cqr->block)
1261 return;
1262
1263 list_for_each_safe(l, n, &device->ccw_queue) {
1264 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1265 if (cqr->status == DASD_CQR_QUEUED &&
1266 ref_cqr->block == cqr->block) {
1267 cqr->status = DASD_CQR_CLEARED;
1268 }
1269 }
1270};
1271
1272
1273
1274
1275
1276static void __dasd_device_process_ccw_queue(struct dasd_device *device,
1277 struct list_head *final_queue)
1278{
1279 struct list_head *l, *n;
1280 struct dasd_ccw_req *cqr;
1281
1282
1283 list_for_each_safe(l, n, &device->ccw_queue) {
1284 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1285
1286
1287 if (cqr->status == DASD_CQR_QUEUED ||
1288 cqr->status == DASD_CQR_IN_IO ||
1289 cqr->status == DASD_CQR_CLEAR_PENDING)
1290 break;
1291 if (cqr->status == DASD_CQR_ERROR) {
1292 __dasd_device_recovery(device, cqr);
1293 }
1294
1295 list_move_tail(&cqr->devlist, final_queue);
1296 }
1297}
1298
1299
1300
1301
1302
1303static void __dasd_device_process_final_queue(struct dasd_device *device,
1304 struct list_head *final_queue)
1305{
1306 struct list_head *l, *n;
1307 struct dasd_ccw_req *cqr;
1308 struct dasd_block *block;
1309 void (*callback)(struct dasd_ccw_req *, void *data);
1310 void *callback_data;
1311 char errorstring[ERRORLENGTH];
1312
1313 list_for_each_safe(l, n, final_queue) {
1314 cqr = list_entry(l, struct dasd_ccw_req, devlist);
1315 list_del_init(&cqr->devlist);
1316 block = cqr->block;
1317 callback = cqr->callback;
1318 callback_data = cqr->callback_data;
1319 if (block)
1320 spin_lock_bh(&block->queue_lock);
1321 switch (cqr->status) {
1322 case DASD_CQR_SUCCESS:
1323 cqr->status = DASD_CQR_DONE;
1324 break;
1325 case DASD_CQR_ERROR:
1326 cqr->status = DASD_CQR_NEED_ERP;
1327 break;
1328 case DASD_CQR_CLEARED:
1329 cqr->status = DASD_CQR_TERMINATED;
1330 break;
1331 default:
1332
1333 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
1334 dev_err(&device->cdev->dev,
1335 "An error occurred in the DASD device driver, "
1336 "reason=%s\n", errorstring);
1337 BUG();
1338 }
1339 if (cqr->callback != NULL)
1340 (callback)(cqr, callback_data);
1341 if (block)
1342 spin_unlock_bh(&block->queue_lock);
1343 }
1344}
1345
1346
1347
1348
1349
1350static void __dasd_device_check_expire(struct dasd_device *device)
1351{
1352 struct dasd_ccw_req *cqr;
1353
1354 if (list_empty(&device->ccw_queue))
1355 return;
1356 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1357 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) &&
1358 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) {
1359 if (device->discipline->term_IO(cqr) != 0) {
1360
1361 dev_err(&device->cdev->dev,
1362 "cqr %p timed out (%lus) but cannot be "
1363 "ended, retrying in 5 s\n",
1364 cqr, (cqr->expires/HZ));
1365 cqr->expires += 5*HZ;
1366 dasd_device_set_timer(device, 5*HZ);
1367 } else {
1368 dev_err(&device->cdev->dev,
1369 "cqr %p timed out (%lus), %i retries "
1370 "remaining\n", cqr, (cqr->expires/HZ),
1371 cqr->retries);
1372 }
1373 }
1374}
1375
1376
1377
1378
1379
1380static void __dasd_device_start_head(struct dasd_device *device)
1381{
1382 struct dasd_ccw_req *cqr;
1383 int rc;
1384
1385 if (list_empty(&device->ccw_queue))
1386 return;
1387 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1388 if (cqr->status != DASD_CQR_QUEUED)
1389 return;
1390
1391
1392
1393
1394 if (device->stopped &&
1395 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
1396 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
1397 cqr->intrc = -EAGAIN;
1398 cqr->status = DASD_CQR_CLEARED;
1399 dasd_schedule_device_bh(device);
1400 return;
1401 }
1402
1403 rc = device->discipline->start_IO(cqr);
1404 if (rc == 0)
1405 dasd_device_set_timer(device, cqr->expires);
1406 else if (rc == -EACCES) {
1407 dasd_schedule_device_bh(device);
1408 } else
1409
1410 dasd_device_set_timer(device, 50);
1411}
1412
1413static void __dasd_device_check_path_events(struct dasd_device *device)
1414{
1415 int rc;
1416
1417 if (device->path_data.tbvpm) {
1418 if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
1419 DASD_UNRESUMED_PM))
1420 return;
1421 rc = device->discipline->verify_path(
1422 device, device->path_data.tbvpm);
1423 if (rc)
1424 dasd_device_set_timer(device, 50);
1425 else
1426 device->path_data.tbvpm = 0;
1427 }
1428};
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440int dasd_flush_device_queue(struct dasd_device *device)
1441{
1442 struct dasd_ccw_req *cqr, *n;
1443 int rc;
1444 struct list_head flush_queue;
1445
1446 INIT_LIST_HEAD(&flush_queue);
1447 spin_lock_irq(get_ccwdev_lock(device->cdev));
1448 rc = 0;
1449 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
1450
1451 switch (cqr->status) {
1452 case DASD_CQR_IN_IO:
1453 rc = device->discipline->term_IO(cqr);
1454 if (rc) {
1455
1456 dev_err(&device->cdev->dev,
1457 "Flushing the DASD request queue "
1458 "failed for request %p\n", cqr);
1459
1460 goto finished;
1461 }
1462 break;
1463 case DASD_CQR_QUEUED:
1464 cqr->stopclk = get_clock();
1465 cqr->status = DASD_CQR_CLEARED;
1466 break;
1467 default:
1468 break;
1469 }
1470 list_move_tail(&cqr->devlist, &flush_queue);
1471 }
1472finished:
1473 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1474
1475
1476
1477
1478
1479 list_for_each_entry_safe(cqr, n, &flush_queue, devlist)
1480 wait_event(dasd_flush_wq,
1481 (cqr->status != DASD_CQR_CLEAR_PENDING));
1482
1483
1484
1485
1486 __dasd_device_process_final_queue(device, &flush_queue);
1487 return rc;
1488}
1489
1490
1491
1492
1493static void dasd_device_tasklet(struct dasd_device *device)
1494{
1495 struct list_head final_queue;
1496
1497 atomic_set (&device->tasklet_scheduled, 0);
1498 INIT_LIST_HEAD(&final_queue);
1499 spin_lock_irq(get_ccwdev_lock(device->cdev));
1500
1501 __dasd_device_check_expire(device);
1502
1503 __dasd_device_process_ccw_queue(device, &final_queue);
1504 __dasd_device_check_path_events(device);
1505 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1506
1507 __dasd_device_process_final_queue(device, &final_queue);
1508 spin_lock_irq(get_ccwdev_lock(device->cdev));
1509
1510 __dasd_device_start_head(device);
1511 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1512 dasd_put_device(device);
1513}
1514
1515
1516
1517
1518void dasd_schedule_device_bh(struct dasd_device *device)
1519{
1520
1521 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0)
1522 return;
1523 dasd_get_device(device);
1524 tasklet_hi_schedule(&device->tasklet);
1525}
1526
1527void dasd_device_set_stop_bits(struct dasd_device *device, int bits)
1528{
1529 device->stopped |= bits;
1530}
1531EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits);
1532
1533void dasd_device_remove_stop_bits(struct dasd_device *device, int bits)
1534{
1535 device->stopped &= ~bits;
1536 if (!device->stopped)
1537 wake_up(&generic_waitq);
1538}
1539EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits);
1540
1541
1542
1543
1544
1545void dasd_add_request_head(struct dasd_ccw_req *cqr)
1546{
1547 struct dasd_device *device;
1548 unsigned long flags;
1549
1550 device = cqr->startdev;
1551 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1552 cqr->status = DASD_CQR_QUEUED;
1553 list_add(&cqr->devlist, &device->ccw_queue);
1554
1555 dasd_schedule_device_bh(device);
1556 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1557}
1558
1559
1560
1561
1562
1563void dasd_add_request_tail(struct dasd_ccw_req *cqr)
1564{
1565 struct dasd_device *device;
1566 unsigned long flags;
1567
1568 device = cqr->startdev;
1569 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1570 cqr->status = DASD_CQR_QUEUED;
1571 list_add_tail(&cqr->devlist, &device->ccw_queue);
1572
1573 dasd_schedule_device_bh(device);
1574 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1575}
1576
1577
1578
1579
1580static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
1581{
1582 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1583 cqr->callback_data = DASD_SLEEPON_END_TAG;
1584 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
1585 wake_up(&generic_waitq);
1586}
1587
1588static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
1589{
1590 struct dasd_device *device;
1591 int rc;
1592
1593 device = cqr->startdev;
1594 spin_lock_irq(get_ccwdev_lock(device->cdev));
1595 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
1596 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1597 return rc;
1598}
1599
1600
1601
1602
1603static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr)
1604{
1605 struct dasd_device *device;
1606 dasd_erp_fn_t erp_fn;
1607
1608 if (cqr->status == DASD_CQR_FILLED)
1609 return 0;
1610 device = cqr->startdev;
1611 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1612 if (cqr->status == DASD_CQR_TERMINATED) {
1613 device->discipline->handle_terminated_request(cqr);
1614 return 1;
1615 }
1616 if (cqr->status == DASD_CQR_NEED_ERP) {
1617 erp_fn = device->discipline->erp_action(cqr);
1618 erp_fn(cqr);
1619 return 1;
1620 }
1621 if (cqr->status == DASD_CQR_FAILED)
1622 dasd_log_sense(cqr, &cqr->irb);
1623 if (cqr->refers) {
1624 __dasd_process_erp(device, cqr);
1625 return 1;
1626 }
1627 }
1628 return 0;
1629}
1630
1631static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr)
1632{
1633 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) {
1634 if (cqr->refers)
1635 return 1;
1636 return ((cqr->status != DASD_CQR_DONE) &&
1637 (cqr->status != DASD_CQR_FAILED));
1638 } else
1639 return (cqr->status == DASD_CQR_FILLED);
1640}
1641
1642static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
1643{
1644 struct dasd_device *device;
1645 int rc;
1646 struct list_head ccw_queue;
1647 struct dasd_ccw_req *cqr;
1648
1649 INIT_LIST_HEAD(&ccw_queue);
1650 maincqr->status = DASD_CQR_FILLED;
1651 device = maincqr->startdev;
1652 list_add(&maincqr->blocklist, &ccw_queue);
1653 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr);
1654 cqr = list_first_entry(&ccw_queue,
1655 struct dasd_ccw_req, blocklist)) {
1656
1657 if (__dasd_sleep_on_erp(cqr))
1658 continue;
1659 if (cqr->status != DASD_CQR_FILLED)
1660 continue;
1661 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1662 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1663 cqr->status = DASD_CQR_FAILED;
1664 cqr->intrc = -EPERM;
1665 continue;
1666 }
1667
1668 if (device->stopped & ~DASD_STOPPED_PENDING &&
1669 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
1670 (!dasd_eer_enabled(device))) {
1671 cqr->status = DASD_CQR_FAILED;
1672 continue;
1673 }
1674
1675 if (interruptible) {
1676 rc = wait_event_interruptible(
1677 generic_waitq, !(device->stopped));
1678 if (rc == -ERESTARTSYS) {
1679 cqr->status = DASD_CQR_FAILED;
1680 maincqr->intrc = rc;
1681 continue;
1682 }
1683 } else
1684 wait_event(generic_waitq, !(device->stopped));
1685
1686 cqr->callback = dasd_wakeup_cb;
1687 cqr->callback_data = DASD_SLEEPON_START_TAG;
1688 dasd_add_request_tail(cqr);
1689 if (interruptible) {
1690 rc = wait_event_interruptible(
1691 generic_waitq, _wait_for_wakeup(cqr));
1692 if (rc == -ERESTARTSYS) {
1693 dasd_cancel_req(cqr);
1694
1695 wait_event(generic_waitq,
1696 _wait_for_wakeup(cqr));
1697 cqr->status = DASD_CQR_FAILED;
1698 maincqr->intrc = rc;
1699 continue;
1700 }
1701 } else
1702 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1703 }
1704
1705 maincqr->endclk = get_clock();
1706 if ((maincqr->status != DASD_CQR_DONE) &&
1707 (maincqr->intrc != -ERESTARTSYS))
1708 dasd_log_sense(maincqr, &maincqr->irb);
1709 if (maincqr->status == DASD_CQR_DONE)
1710 rc = 0;
1711 else if (maincqr->intrc)
1712 rc = maincqr->intrc;
1713 else
1714 rc = -EIO;
1715 return rc;
1716}
1717
1718
1719
1720
1721
1722int dasd_sleep_on(struct dasd_ccw_req *cqr)
1723{
1724 return _dasd_sleep_on(cqr, 0);
1725}
1726
1727
1728
1729
1730
1731int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr)
1732{
1733 return _dasd_sleep_on(cqr, 1);
1734}
1735
1736
1737
1738
1739
1740
1741
1742static inline int _dasd_term_running_cqr(struct dasd_device *device)
1743{
1744 struct dasd_ccw_req *cqr;
1745
1746 if (list_empty(&device->ccw_queue))
1747 return 0;
1748 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
1749 return device->discipline->term_IO(cqr);
1750}
1751
1752int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
1753{
1754 struct dasd_device *device;
1755 int rc;
1756
1757 device = cqr->startdev;
1758 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) &&
1759 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
1760 cqr->status = DASD_CQR_FAILED;
1761 cqr->intrc = -EPERM;
1762 return -EIO;
1763 }
1764 spin_lock_irq(get_ccwdev_lock(device->cdev));
1765 rc = _dasd_term_running_cqr(device);
1766 if (rc) {
1767 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1768 return rc;
1769 }
1770 cqr->callback = dasd_wakeup_cb;
1771 cqr->callback_data = DASD_SLEEPON_START_TAG;
1772 cqr->status = DASD_CQR_QUEUED;
1773 list_add(&cqr->devlist, &device->ccw_queue);
1774
1775
1776 dasd_schedule_device_bh(device);
1777
1778 spin_unlock_irq(get_ccwdev_lock(device->cdev));
1779
1780 wait_event(generic_waitq, _wait_for_wakeup(cqr));
1781
1782 if (cqr->status == DASD_CQR_DONE)
1783 rc = 0;
1784 else if (cqr->intrc)
1785 rc = cqr->intrc;
1786 else
1787 rc = -EIO;
1788 return rc;
1789}
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801int dasd_cancel_req(struct dasd_ccw_req *cqr)
1802{
1803 struct dasd_device *device = cqr->startdev;
1804 unsigned long flags;
1805 int rc;
1806
1807 rc = 0;
1808 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1809 switch (cqr->status) {
1810 case DASD_CQR_QUEUED:
1811
1812 cqr->status = DASD_CQR_CLEARED;
1813 break;
1814 case DASD_CQR_IN_IO:
1815
1816 rc = device->discipline->term_IO(cqr);
1817 if (rc) {
1818 dev_err(&device->cdev->dev,
1819 "Cancelling request %p failed with rc=%d\n",
1820 cqr, rc);
1821 } else {
1822 cqr->stopclk = get_clock();
1823 }
1824 break;
1825 default:
1826 break;
1827 }
1828 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1829 dasd_schedule_device_bh(device);
1830 return rc;
1831}
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843static void dasd_block_timeout(unsigned long ptr)
1844{
1845 unsigned long flags;
1846 struct dasd_block *block;
1847
1848 block = (struct dasd_block *) ptr;
1849 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags);
1850
1851 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING);
1852 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags);
1853 dasd_schedule_block_bh(block);
1854}
1855
1856
1857
1858
1859void dasd_block_set_timer(struct dasd_block *block, int expires)
1860{
1861 if (expires == 0)
1862 del_timer(&block->timer);
1863 else
1864 mod_timer(&block->timer, jiffies + expires);
1865}
1866
1867
1868
1869
1870void dasd_block_clear_timer(struct dasd_block *block)
1871{
1872 del_timer(&block->timer);
1873}
1874
1875
1876
1877
1878static void __dasd_process_erp(struct dasd_device *device,
1879 struct dasd_ccw_req *cqr)
1880{
1881 dasd_erp_fn_t erp_fn;
1882
1883 if (cqr->status == DASD_CQR_DONE)
1884 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful");
1885 else
1886 dev_err(&device->cdev->dev, "ERP failed for the DASD\n");
1887 erp_fn = device->discipline->erp_postaction(cqr);
1888 erp_fn(cqr);
1889}
1890
1891
1892
1893
1894static void __dasd_process_request_queue(struct dasd_block *block)
1895{
1896 struct request_queue *queue;
1897 struct request *req;
1898 struct dasd_ccw_req *cqr;
1899 struct dasd_device *basedev;
1900 unsigned long flags;
1901 queue = block->request_queue;
1902 basedev = block->base;
1903
1904 if (queue == NULL)
1905 return;
1906
1907
1908
1909
1910
1911
1912
1913
1914 if (basedev->state < DASD_STATE_READY) {
1915 while ((req = blk_fetch_request(block->request_queue)))
1916 __blk_end_request_all(req, -EIO);
1917 return;
1918 }
1919
1920 while (!blk_queue_plugged(queue) && (req = blk_peek_request(queue))) {
1921 if (basedev->features & DASD_FEATURE_READONLY &&
1922 rq_data_dir(req) == WRITE) {
1923 DBF_DEV_EVENT(DBF_ERR, basedev,
1924 "Rejecting write request %p",
1925 req);
1926 blk_start_request(req);
1927 __blk_end_request_all(req, -EIO);
1928 continue;
1929 }
1930 cqr = basedev->discipline->build_cp(basedev, block, req);
1931 if (IS_ERR(cqr)) {
1932 if (PTR_ERR(cqr) == -EBUSY)
1933 break;
1934 if (PTR_ERR(cqr) == -ENOMEM)
1935 break;
1936 if (PTR_ERR(cqr) == -EAGAIN) {
1937
1938
1939
1940
1941
1942
1943 if (!list_empty(&block->ccw_queue))
1944 break;
1945 spin_lock_irqsave(
1946 get_ccwdev_lock(basedev->cdev), flags);
1947 dasd_device_set_stop_bits(basedev,
1948 DASD_STOPPED_PENDING);
1949 spin_unlock_irqrestore(
1950 get_ccwdev_lock(basedev->cdev), flags);
1951 dasd_block_set_timer(block, HZ/2);
1952 break;
1953 }
1954 DBF_DEV_EVENT(DBF_ERR, basedev,
1955 "CCW creation failed (rc=%ld) "
1956 "on request %p",
1957 PTR_ERR(cqr), req);
1958 blk_start_request(req);
1959 __blk_end_request_all(req, -EIO);
1960 continue;
1961 }
1962
1963
1964
1965
1966 cqr->callback_data = (void *) req;
1967 cqr->status = DASD_CQR_FILLED;
1968 blk_start_request(req);
1969 list_add_tail(&cqr->blocklist, &block->ccw_queue);
1970 dasd_profile_start(block, cqr, req);
1971 }
1972}
1973
1974static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
1975{
1976 struct request *req;
1977 int status;
1978 int error = 0;
1979
1980 req = (struct request *) cqr->callback_data;
1981 dasd_profile_end(cqr->block, cqr, req);
1982 status = cqr->block->base->discipline->free_cp(cqr, req);
1983 if (status <= 0)
1984 error = status ? status : -EIO;
1985 __blk_end_request_all(req, error);
1986}
1987
1988
1989
1990
1991static void __dasd_process_block_ccw_queue(struct dasd_block *block,
1992 struct list_head *final_queue)
1993{
1994 struct list_head *l, *n;
1995 struct dasd_ccw_req *cqr;
1996 dasd_erp_fn_t erp_fn;
1997 unsigned long flags;
1998 struct dasd_device *base = block->base;
1999
2000restart:
2001
2002 list_for_each_safe(l, n, &block->ccw_queue) {
2003 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2004 if (cqr->status != DASD_CQR_DONE &&
2005 cqr->status != DASD_CQR_FAILED &&
2006 cqr->status != DASD_CQR_NEED_ERP &&
2007 cqr->status != DASD_CQR_TERMINATED)
2008 continue;
2009
2010 if (cqr->status == DASD_CQR_TERMINATED) {
2011 base->discipline->handle_terminated_request(cqr);
2012 goto restart;
2013 }
2014
2015
2016 if (cqr->status == DASD_CQR_NEED_ERP) {
2017 erp_fn = base->discipline->erp_action(cqr);
2018 if (IS_ERR(erp_fn(cqr)))
2019 continue;
2020 goto restart;
2021 }
2022
2023
2024 if (cqr->status == DASD_CQR_FAILED) {
2025 dasd_log_sense(cqr, &cqr->irb);
2026 }
2027
2028
2029 if (dasd_eer_enabled(base) &&
2030 cqr->status == DASD_CQR_FAILED) {
2031 dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
2032
2033
2034 cqr->status = DASD_CQR_FILLED;
2035 cqr->retries = 255;
2036 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
2037 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
2038 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
2039 flags);
2040 goto restart;
2041 }
2042
2043
2044 if (cqr->refers) {
2045 __dasd_process_erp(base, cqr);
2046 goto restart;
2047 }
2048
2049
2050 cqr->endclk = get_clock();
2051 list_move_tail(&cqr->blocklist, final_queue);
2052 }
2053}
2054
2055static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data)
2056{
2057 dasd_schedule_block_bh(cqr->block);
2058}
2059
2060static void __dasd_block_start_head(struct dasd_block *block)
2061{
2062 struct dasd_ccw_req *cqr;
2063
2064 if (list_empty(&block->ccw_queue))
2065 return;
2066
2067
2068
2069
2070 list_for_each_entry(cqr, &block->ccw_queue, blocklist) {
2071 if (cqr->status != DASD_CQR_FILLED)
2072 continue;
2073 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) &&
2074 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) {
2075 cqr->status = DASD_CQR_FAILED;
2076 cqr->intrc = -EPERM;
2077 dasd_schedule_block_bh(block);
2078 continue;
2079 }
2080
2081 if (block->base->stopped & ~DASD_STOPPED_PENDING &&
2082 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
2083 (!dasd_eer_enabled(block->base))) {
2084 cqr->status = DASD_CQR_FAILED;
2085 dasd_schedule_block_bh(block);
2086 continue;
2087 }
2088
2089 if (block->base->stopped)
2090 return;
2091
2092
2093 if (!cqr->startdev)
2094 cqr->startdev = block->base;
2095
2096
2097 cqr->callback = dasd_return_cqr_cb;
2098
2099 dasd_add_request_tail(cqr);
2100 }
2101}
2102
2103
2104
2105
2106
2107
2108static void dasd_block_tasklet(struct dasd_block *block)
2109{
2110 struct list_head final_queue;
2111 struct list_head *l, *n;
2112 struct dasd_ccw_req *cqr;
2113
2114 atomic_set(&block->tasklet_scheduled, 0);
2115 INIT_LIST_HEAD(&final_queue);
2116 spin_lock(&block->queue_lock);
2117
2118 __dasd_process_block_ccw_queue(block, &final_queue);
2119 spin_unlock(&block->queue_lock);
2120
2121 spin_lock_irq(&block->request_queue_lock);
2122 list_for_each_safe(l, n, &final_queue) {
2123 cqr = list_entry(l, struct dasd_ccw_req, blocklist);
2124 list_del_init(&cqr->blocklist);
2125 __dasd_cleanup_cqr(cqr);
2126 }
2127 spin_lock(&block->queue_lock);
2128
2129 __dasd_process_request_queue(block);
2130
2131 __dasd_block_start_head(block);
2132 spin_unlock(&block->queue_lock);
2133 spin_unlock_irq(&block->request_queue_lock);
2134 dasd_put_device(block->base);
2135}
2136
2137static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data)
2138{
2139 wake_up(&dasd_flush_wq);
2140}
2141
2142
2143
2144
2145
2146
2147static int dasd_flush_block_queue(struct dasd_block *block)
2148{
2149 struct dasd_ccw_req *cqr, *n;
2150 int rc, i;
2151 struct list_head flush_queue;
2152
2153 INIT_LIST_HEAD(&flush_queue);
2154 spin_lock_bh(&block->queue_lock);
2155 rc = 0;
2156restart:
2157 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
2158
2159 if (cqr->status >= DASD_CQR_QUEUED)
2160 rc = dasd_cancel_req(cqr);
2161 if (rc < 0)
2162 break;
2163
2164
2165
2166
2167
2168 cqr->callback = _dasd_wake_block_flush_cb;
2169 for (i = 0; cqr != NULL; cqr = cqr->refers, i++)
2170 list_move_tail(&cqr->blocklist, &flush_queue);
2171 if (i > 1)
2172
2173 goto restart;
2174 }
2175 spin_unlock_bh(&block->queue_lock);
2176
2177restart_cb:
2178 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) {
2179 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED));
2180
2181 if (cqr->refers) {
2182 spin_lock_bh(&block->queue_lock);
2183 __dasd_process_erp(block->base, cqr);
2184 spin_unlock_bh(&block->queue_lock);
2185
2186
2187 goto restart_cb;
2188 }
2189
2190 spin_lock_irq(&block->request_queue_lock);
2191 cqr->endclk = get_clock();
2192 list_del_init(&cqr->blocklist);
2193 __dasd_cleanup_cqr(cqr);
2194 spin_unlock_irq(&block->request_queue_lock);
2195 }
2196 return rc;
2197}
2198
2199
2200
2201
2202void dasd_schedule_block_bh(struct dasd_block *block)
2203{
2204
2205 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0)
2206 return;
2207
2208 dasd_get_device(block->base);
2209 tasklet_hi_schedule(&block->tasklet);
2210}
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221static void do_dasd_request(struct request_queue *queue)
2222{
2223 struct dasd_block *block;
2224
2225 block = queue->queuedata;
2226 spin_lock(&block->queue_lock);
2227
2228 __dasd_process_request_queue(block);
2229
2230 __dasd_block_start_head(block);
2231 spin_unlock(&block->queue_lock);
2232}
2233
2234
2235
2236
2237static int dasd_alloc_queue(struct dasd_block *block)
2238{
2239 int rc;
2240
2241 block->request_queue = blk_init_queue(do_dasd_request,
2242 &block->request_queue_lock);
2243 if (block->request_queue == NULL)
2244 return -ENOMEM;
2245
2246 block->request_queue->queuedata = block;
2247
2248 elevator_exit(block->request_queue->elevator);
2249 block->request_queue->elevator = NULL;
2250 rc = elevator_init(block->request_queue, "deadline");
2251 if (rc) {
2252 blk_cleanup_queue(block->request_queue);
2253 return rc;
2254 }
2255 return 0;
2256}
2257
2258
2259
2260
2261static void dasd_setup_queue(struct dasd_block *block)
2262{
2263 int max;
2264
2265 if (block->base->features & DASD_FEATURE_USERAW) {
2266
2267
2268
2269
2270
2271
2272
2273 max = 2048;
2274 } else {
2275 max = block->base->discipline->max_blocks << block->s2b_shift;
2276 }
2277 blk_queue_logical_block_size(block->request_queue,
2278 block->bp_block);
2279 blk_queue_max_hw_sectors(block->request_queue, max);
2280 blk_queue_max_segments(block->request_queue, -1L);
2281
2282
2283
2284 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE);
2285 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1);
2286}
2287
2288
2289
2290
2291static void dasd_free_queue(struct dasd_block *block)
2292{
2293 if (block->request_queue) {
2294 blk_cleanup_queue(block->request_queue);
2295 block->request_queue = NULL;
2296 }
2297}
2298
2299
2300
2301
2302static void dasd_flush_request_queue(struct dasd_block *block)
2303{
2304 struct request *req;
2305
2306 if (!block->request_queue)
2307 return;
2308
2309 spin_lock_irq(&block->request_queue_lock);
2310 while ((req = blk_fetch_request(block->request_queue)))
2311 __blk_end_request_all(req, -EIO);
2312 spin_unlock_irq(&block->request_queue_lock);
2313}
2314
2315static int dasd_open(struct block_device *bdev, fmode_t mode)
2316{
2317 struct dasd_block *block = bdev->bd_disk->private_data;
2318 struct dasd_device *base;
2319 int rc;
2320
2321 if (!block)
2322 return -ENODEV;
2323
2324 base = block->base;
2325 atomic_inc(&block->open_count);
2326 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) {
2327 rc = -ENODEV;
2328 goto unlock;
2329 }
2330
2331 if (!try_module_get(base->discipline->owner)) {
2332 rc = -EINVAL;
2333 goto unlock;
2334 }
2335
2336 if (dasd_probeonly) {
2337 dev_info(&base->cdev->dev,
2338 "Accessing the DASD failed because it is in "
2339 "probeonly mode\n");
2340 rc = -EPERM;
2341 goto out;
2342 }
2343
2344 if (base->state <= DASD_STATE_BASIC) {
2345 DBF_DEV_EVENT(DBF_ERR, base, " %s",
2346 " Cannot open unrecognized device");
2347 rc = -ENODEV;
2348 goto out;
2349 }
2350
2351 if ((mode & FMODE_WRITE) &&
2352 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) ||
2353 (base->features & DASD_FEATURE_READONLY))) {
2354 rc = -EROFS;
2355 goto out;
2356 }
2357
2358 return 0;
2359
2360out:
2361 module_put(base->discipline->owner);
2362unlock:
2363 atomic_dec(&block->open_count);
2364 return rc;
2365}
2366
2367static int dasd_release(struct gendisk *disk, fmode_t mode)
2368{
2369 struct dasd_block *block = disk->private_data;
2370
2371 atomic_dec(&block->open_count);
2372 module_put(block->base->discipline->owner);
2373 return 0;
2374}
2375
2376
2377
2378
2379static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2380{
2381 struct dasd_block *block;
2382 struct dasd_device *base;
2383
2384 block = bdev->bd_disk->private_data;
2385 if (!block)
2386 return -ENODEV;
2387 base = block->base;
2388
2389 if (!base->discipline ||
2390 !base->discipline->fill_geometry)
2391 return -EINVAL;
2392
2393 base->discipline->fill_geometry(block, geo);
2394 geo->start = get_start_sect(bdev) >> block->s2b_shift;
2395 return 0;
2396}
2397
2398const struct block_device_operations
2399dasd_device_operations = {
2400 .owner = THIS_MODULE,
2401 .open = dasd_open,
2402 .release = dasd_release,
2403 .ioctl = dasd_ioctl,
2404 .compat_ioctl = dasd_ioctl,
2405 .getgeo = dasd_getgeo,
2406};
2407
2408
2409
2410
2411
2412static void
2413dasd_exit(void)
2414{
2415#ifdef CONFIG_PROC_FS
2416 dasd_proc_exit();
2417#endif
2418 dasd_eer_exit();
2419 if (dasd_page_cache != NULL) {
2420 kmem_cache_destroy(dasd_page_cache);
2421 dasd_page_cache = NULL;
2422 }
2423 dasd_gendisk_exit();
2424 dasd_devmap_exit();
2425 if (dasd_debug_area != NULL) {
2426 debug_unregister(dasd_debug_area);
2427 dasd_debug_area = NULL;
2428 }
2429}
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440int dasd_device_is_ro(struct dasd_device *device)
2441{
2442 struct ccw_dev_id dev_id;
2443 struct diag210 diag_data;
2444 int rc;
2445
2446 if (!MACHINE_IS_VM)
2447 return 0;
2448 ccw_device_get_id(device->cdev, &dev_id);
2449 memset(&diag_data, 0, sizeof(diag_data));
2450 diag_data.vrdcdvno = dev_id.devno;
2451 diag_data.vrdclen = sizeof(diag_data);
2452 rc = diag210(&diag_data);
2453 if (rc == 0 || rc == 2) {
2454 return diag_data.vrdcvfla & 0x80;
2455 } else {
2456 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d",
2457 dev_id.devno, rc);
2458 return 0;
2459 }
2460}
2461EXPORT_SYMBOL_GPL(dasd_device_is_ro);
2462
2463static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
2464{
2465 struct ccw_device *cdev = data;
2466 int ret;
2467
2468 ret = ccw_device_set_online(cdev);
2469 if (ret)
2470 pr_warning("%s: Setting the DASD online failed with rc=%d\n",
2471 dev_name(&cdev->dev), ret);
2472}
2473
2474
2475
2476
2477
2478int dasd_generic_probe(struct ccw_device *cdev,
2479 struct dasd_discipline *discipline)
2480{
2481 int ret;
2482
2483 ret = dasd_add_sysfs_files(cdev);
2484 if (ret) {
2485 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
2486 "dasd_generic_probe: could not add "
2487 "sysfs entries");
2488 return ret;
2489 }
2490 cdev->handler = &dasd_int_handler;
2491
2492
2493
2494
2495
2496
2497 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
2498 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
2499 async_schedule(dasd_generic_auto_online, cdev);
2500 return 0;
2501}
2502
2503
2504
2505
2506
2507void dasd_generic_remove(struct ccw_device *cdev)
2508{
2509 struct dasd_device *device;
2510 struct dasd_block *block;
2511
2512 cdev->handler = NULL;
2513
2514 dasd_remove_sysfs_files(cdev);
2515 device = dasd_device_from_cdev(cdev);
2516 if (IS_ERR(device))
2517 return;
2518 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2519
2520 dasd_put_device(device);
2521 return;
2522 }
2523
2524
2525
2526
2527
2528 dasd_set_target_state(device, DASD_STATE_NEW);
2529
2530 block = device->block;
2531 device->block = NULL;
2532 dasd_delete_device(device);
2533
2534
2535
2536
2537 if (block)
2538 dasd_free_block(block);
2539}
2540
2541
2542
2543
2544
2545
2546int dasd_generic_set_online(struct ccw_device *cdev,
2547 struct dasd_discipline *base_discipline)
2548{
2549 struct dasd_discipline *discipline;
2550 struct dasd_device *device;
2551 int rc;
2552
2553
2554 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
2555 device = dasd_create_device(cdev);
2556 if (IS_ERR(device))
2557 return PTR_ERR(device);
2558
2559 discipline = base_discipline;
2560 if (device->features & DASD_FEATURE_USEDIAG) {
2561 if (!dasd_diag_discipline_pointer) {
2562 pr_warning("%s Setting the DASD online failed because "
2563 "of missing DIAG discipline\n",
2564 dev_name(&cdev->dev));
2565 dasd_delete_device(device);
2566 return -ENODEV;
2567 }
2568 discipline = dasd_diag_discipline_pointer;
2569 }
2570 if (!try_module_get(base_discipline->owner)) {
2571 dasd_delete_device(device);
2572 return -EINVAL;
2573 }
2574 if (!try_module_get(discipline->owner)) {
2575 module_put(base_discipline->owner);
2576 dasd_delete_device(device);
2577 return -EINVAL;
2578 }
2579 device->base_discipline = base_discipline;
2580 device->discipline = discipline;
2581
2582
2583 rc = discipline->check_device(device);
2584 if (rc) {
2585 pr_warning("%s Setting the DASD online with discipline %s "
2586 "failed with rc=%i\n",
2587 dev_name(&cdev->dev), discipline->name, rc);
2588 module_put(discipline->owner);
2589 module_put(base_discipline->owner);
2590 dasd_delete_device(device);
2591 return rc;
2592 }
2593
2594 dasd_set_target_state(device, DASD_STATE_ONLINE);
2595 if (device->state <= DASD_STATE_KNOWN) {
2596 pr_warning("%s Setting the DASD online failed because of a "
2597 "missing discipline\n", dev_name(&cdev->dev));
2598 rc = -ENODEV;
2599 dasd_set_target_state(device, DASD_STATE_NEW);
2600 if (device->block)
2601 dasd_free_block(device->block);
2602 dasd_delete_device(device);
2603 } else
2604 pr_debug("dasd_generic device %s found\n",
2605 dev_name(&cdev->dev));
2606
2607 wait_event(dasd_init_waitq, _wait_for_device(device));
2608
2609 dasd_put_device(device);
2610 return rc;
2611}
2612
2613int dasd_generic_set_offline(struct ccw_device *cdev)
2614{
2615 struct dasd_device *device;
2616 struct dasd_block *block;
2617 int max_count, open_count;
2618
2619 device = dasd_device_from_cdev(cdev);
2620 if (IS_ERR(device))
2621 return PTR_ERR(device);
2622 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2623
2624 dasd_put_device(device);
2625 return 0;
2626 }
2627
2628
2629
2630
2631
2632
2633 if (device->block) {
2634 max_count = device->block->bdev ? 0 : -1;
2635 open_count = atomic_read(&device->block->open_count);
2636 if (open_count > max_count) {
2637 if (open_count > 0)
2638 pr_warning("%s: The DASD cannot be set offline "
2639 "with open count %i\n",
2640 dev_name(&cdev->dev), open_count);
2641 else
2642 pr_warning("%s: The DASD cannot be set offline "
2643 "while it is in use\n",
2644 dev_name(&cdev->dev));
2645 clear_bit(DASD_FLAG_OFFLINE, &device->flags);
2646 dasd_put_device(device);
2647 return -EBUSY;
2648 }
2649 }
2650 dasd_set_target_state(device, DASD_STATE_NEW);
2651
2652 block = device->block;
2653 device->block = NULL;
2654 dasd_delete_device(device);
2655
2656
2657
2658
2659 if (block)
2660 dasd_free_block(block);
2661 return 0;
2662}
2663
2664int dasd_generic_last_path_gone(struct dasd_device *device)
2665{
2666 struct dasd_ccw_req *cqr;
2667
2668 dev_warn(&device->cdev->dev, "No operational channel path is left "
2669 "for the device\n");
2670 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
2671
2672 dasd_eer_write(device, NULL, DASD_EER_NOPATH);
2673
2674 if (device->state < DASD_STATE_BASIC)
2675 return 0;
2676
2677 list_for_each_entry(cqr, &device->ccw_queue, devlist)
2678 if ((cqr->status == DASD_CQR_IN_IO) ||
2679 (cqr->status == DASD_CQR_CLEAR_PENDING)) {
2680 cqr->status = DASD_CQR_QUEUED;
2681 cqr->retries++;
2682 }
2683 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
2684 dasd_device_clear_timer(device);
2685 dasd_schedule_device_bh(device);
2686 return 1;
2687}
2688EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
2689
2690int dasd_generic_path_operational(struct dasd_device *device)
2691{
2692 dev_info(&device->cdev->dev, "A channel path to the device has become "
2693 "operational\n");
2694 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
2695 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
2696 if (device->stopped & DASD_UNRESUMED_PM) {
2697 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
2698 dasd_restore_device(device);
2699 return 1;
2700 }
2701 dasd_schedule_device_bh(device);
2702 if (device->block)
2703 dasd_schedule_block_bh(device->block);
2704 return 1;
2705}
2706EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
2707
2708int dasd_generic_notify(struct ccw_device *cdev, int event)
2709{
2710 struct dasd_device *device;
2711 int ret;
2712
2713 device = dasd_device_from_cdev_locked(cdev);
2714 if (IS_ERR(device))
2715 return 0;
2716 ret = 0;
2717 switch (event) {
2718 case CIO_GONE:
2719 case CIO_BOXED:
2720 case CIO_NO_PATH:
2721 device->path_data.opm = 0;
2722 device->path_data.ppm = 0;
2723 device->path_data.npm = 0;
2724 ret = dasd_generic_last_path_gone(device);
2725 break;
2726 case CIO_OPER:
2727 ret = 1;
2728 if (device->path_data.opm)
2729 ret = dasd_generic_path_operational(device);
2730 break;
2731 }
2732 dasd_put_device(device);
2733 return ret;
2734}
2735
2736void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
2737{
2738 int chp;
2739 __u8 oldopm, eventlpm;
2740 struct dasd_device *device;
2741
2742 device = dasd_device_from_cdev_locked(cdev);
2743 if (IS_ERR(device))
2744 return;
2745 for (chp = 0; chp < 8; chp++) {
2746 eventlpm = 0x80 >> chp;
2747 if (path_event[chp] & PE_PATH_GONE) {
2748 oldopm = device->path_data.opm;
2749 device->path_data.opm &= ~eventlpm;
2750 device->path_data.ppm &= ~eventlpm;
2751 device->path_data.npm &= ~eventlpm;
2752 if (oldopm && !device->path_data.opm)
2753 dasd_generic_last_path_gone(device);
2754 }
2755 if (path_event[chp] & PE_PATH_AVAILABLE) {
2756 device->path_data.opm &= ~eventlpm;
2757 device->path_data.ppm &= ~eventlpm;
2758 device->path_data.npm &= ~eventlpm;
2759 device->path_data.tbvpm |= eventlpm;
2760 dasd_schedule_device_bh(device);
2761 }
2762 }
2763 dasd_put_device(device);
2764}
2765EXPORT_SYMBOL_GPL(dasd_generic_path_event);
2766
2767int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
2768{
2769 if (!device->path_data.opm && lpm) {
2770 device->path_data.opm = lpm;
2771 dasd_generic_path_operational(device);
2772 } else
2773 device->path_data.opm |= lpm;
2774 return 0;
2775}
2776EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
2777
2778
2779int dasd_generic_pm_freeze(struct ccw_device *cdev)
2780{
2781 struct dasd_ccw_req *cqr, *n;
2782 int rc;
2783 struct list_head freeze_queue;
2784 struct dasd_device *device = dasd_device_from_cdev(cdev);
2785
2786 if (IS_ERR(device))
2787 return PTR_ERR(device);
2788
2789 if (device->discipline->freeze)
2790 rc = device->discipline->freeze(device);
2791
2792
2793 dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
2794
2795 INIT_LIST_HEAD(&freeze_queue);
2796 spin_lock_irq(get_ccwdev_lock(cdev));
2797 rc = 0;
2798 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) {
2799
2800 if (cqr->status == DASD_CQR_IN_IO) {
2801 rc = device->discipline->term_IO(cqr);
2802 if (rc) {
2803
2804 dev_err(&device->cdev->dev,
2805 "Unable to terminate request %p "
2806 "on suspend\n", cqr);
2807 spin_unlock_irq(get_ccwdev_lock(cdev));
2808 dasd_put_device(device);
2809 return rc;
2810 }
2811 }
2812 list_move_tail(&cqr->devlist, &freeze_queue);
2813 }
2814
2815 spin_unlock_irq(get_ccwdev_lock(cdev));
2816
2817 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) {
2818 wait_event(dasd_flush_wq,
2819 (cqr->status != DASD_CQR_CLEAR_PENDING));
2820 if (cqr->status == DASD_CQR_CLEARED)
2821 cqr->status = DASD_CQR_QUEUED;
2822 }
2823
2824 spin_lock_irq(get_ccwdev_lock(cdev));
2825 list_splice_tail(&freeze_queue, &device->ccw_queue);
2826 spin_unlock_irq(get_ccwdev_lock(cdev));
2827
2828 dasd_put_device(device);
2829 return rc;
2830}
2831EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
2832
2833int dasd_generic_restore_device(struct ccw_device *cdev)
2834{
2835 struct dasd_device *device = dasd_device_from_cdev(cdev);
2836 int rc = 0;
2837
2838 if (IS_ERR(device))
2839 return PTR_ERR(device);
2840
2841
2842 dasd_device_remove_stop_bits(device,
2843 (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
2844
2845 dasd_schedule_device_bh(device);
2846
2847
2848
2849
2850
2851 if (device->discipline->restore && !(device->stopped))
2852 rc = device->discipline->restore(device);
2853 if (rc || device->stopped)
2854
2855
2856
2857
2858 device->stopped |= DASD_UNRESUMED_PM;
2859
2860 if (device->block)
2861 dasd_schedule_block_bh(device->block);
2862
2863 dasd_put_device(device);
2864 return 0;
2865}
2866EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
2867
2868static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
2869 void *rdc_buffer,
2870 int rdc_buffer_size,
2871 int magic)
2872{
2873 struct dasd_ccw_req *cqr;
2874 struct ccw1 *ccw;
2875 unsigned long *idaw;
2876
2877 cqr = dasd_smalloc_request(magic, 1 , rdc_buffer_size, device);
2878
2879 if (IS_ERR(cqr)) {
2880
2881 dev_err(&device->cdev->dev,
2882 "An error occurred in the DASD device driver, "
2883 "reason=%s\n", "13");
2884 return cqr;
2885 }
2886
2887 ccw = cqr->cpaddr;
2888 ccw->cmd_code = CCW_CMD_RDC;
2889 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) {
2890 idaw = (unsigned long *) (cqr->data);
2891 ccw->cda = (__u32)(addr_t) idaw;
2892 ccw->flags = CCW_FLAG_IDA;
2893 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size);
2894 } else {
2895 ccw->cda = (__u32)(addr_t) rdc_buffer;
2896 ccw->flags = 0;
2897 }
2898
2899 ccw->count = rdc_buffer_size;
2900 cqr->startdev = device;
2901 cqr->memdev = device;
2902 cqr->expires = 10*HZ;
2903 cqr->retries = 256;
2904 cqr->buildclk = get_clock();
2905 cqr->status = DASD_CQR_FILLED;
2906 return cqr;
2907}
2908
2909
2910int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
2911 void *rdc_buffer, int rdc_buffer_size)
2912{
2913 int ret;
2914 struct dasd_ccw_req *cqr;
2915
2916 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size,
2917 magic);
2918 if (IS_ERR(cqr))
2919 return PTR_ERR(cqr);
2920
2921 ret = dasd_sleep_on(cqr);
2922 dasd_sfree_request(cqr, cqr->memdev);
2923 return ret;
2924}
2925EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars);
2926
2927
2928
2929
2930
2931
2932
2933char *dasd_get_sense(struct irb *irb)
2934{
2935 struct tsb *tsb = NULL;
2936 char *sense = NULL;
2937
2938 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) {
2939 if (irb->scsw.tm.tcw)
2940 tsb = tcw_get_tsb((struct tcw *)(unsigned long)
2941 irb->scsw.tm.tcw);
2942 if (tsb && tsb->length == 64 && tsb->flags)
2943 switch (tsb->flags & 0x07) {
2944 case 1:
2945 sense = tsb->tsa.iostat.sense;
2946 break;
2947 case 2:
2948 sense = tsb->tsa.ddpc.sense;
2949 break;
2950 default:
2951
2952 break;
2953 }
2954 } else if (irb->esw.esw0.erw.cons) {
2955 sense = irb->ecw;
2956 }
2957 return sense;
2958}
2959EXPORT_SYMBOL_GPL(dasd_get_sense);
2960
2961static int __init dasd_init(void)
2962{
2963 int rc;
2964
2965 init_waitqueue_head(&dasd_init_waitq);
2966 init_waitqueue_head(&dasd_flush_wq);
2967 init_waitqueue_head(&generic_waitq);
2968
2969
2970 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));
2971 if (dasd_debug_area == NULL) {
2972 rc = -ENOMEM;
2973 goto failed;
2974 }
2975 debug_register_view(dasd_debug_area, &debug_sprintf_view);
2976 debug_set_level(dasd_debug_area, DBF_WARNING);
2977
2978 DBF_EVENT(DBF_EMERG, "%s", "debug area created");
2979
2980 dasd_diag_discipline_pointer = NULL;
2981
2982 rc = dasd_devmap_init();
2983 if (rc)
2984 goto failed;
2985 rc = dasd_gendisk_init();
2986 if (rc)
2987 goto failed;
2988 rc = dasd_parse();
2989 if (rc)
2990 goto failed;
2991 rc = dasd_eer_init();
2992 if (rc)
2993 goto failed;
2994#ifdef CONFIG_PROC_FS
2995 rc = dasd_proc_init();
2996 if (rc)
2997 goto failed;
2998#endif
2999
3000 return 0;
3001failed:
3002 pr_info("The DASD device driver could not be initialized\n");
3003 dasd_exit();
3004 return rc;
3005}
3006
3007module_init(dasd_init);
3008module_exit(dasd_exit);
3009
3010EXPORT_SYMBOL(dasd_debug_area);
3011EXPORT_SYMBOL(dasd_diag_discipline_pointer);
3012
3013EXPORT_SYMBOL(dasd_add_request_head);
3014EXPORT_SYMBOL(dasd_add_request_tail);
3015EXPORT_SYMBOL(dasd_cancel_req);
3016EXPORT_SYMBOL(dasd_device_clear_timer);
3017EXPORT_SYMBOL(dasd_block_clear_timer);
3018EXPORT_SYMBOL(dasd_enable_device);
3019EXPORT_SYMBOL(dasd_int_handler);
3020EXPORT_SYMBOL(dasd_kfree_request);
3021EXPORT_SYMBOL(dasd_kick_device);
3022EXPORT_SYMBOL(dasd_kmalloc_request);
3023EXPORT_SYMBOL(dasd_schedule_device_bh);
3024EXPORT_SYMBOL(dasd_schedule_block_bh);
3025EXPORT_SYMBOL(dasd_set_target_state);
3026EXPORT_SYMBOL(dasd_device_set_timer);
3027EXPORT_SYMBOL(dasd_block_set_timer);
3028EXPORT_SYMBOL(dasd_sfree_request);
3029EXPORT_SYMBOL(dasd_sleep_on);
3030EXPORT_SYMBOL(dasd_sleep_on_immediatly);
3031EXPORT_SYMBOL(dasd_sleep_on_interruptible);
3032EXPORT_SYMBOL(dasd_smalloc_request);
3033EXPORT_SYMBOL(dasd_start_IO);
3034EXPORT_SYMBOL(dasd_term_IO);
3035
3036EXPORT_SYMBOL_GPL(dasd_generic_probe);
3037EXPORT_SYMBOL_GPL(dasd_generic_remove);
3038EXPORT_SYMBOL_GPL(dasd_generic_notify);
3039EXPORT_SYMBOL_GPL(dasd_generic_set_online);
3040EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
3041EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change);
3042EXPORT_SYMBOL_GPL(dasd_flush_device_queue);
3043EXPORT_SYMBOL_GPL(dasd_alloc_block);
3044EXPORT_SYMBOL_GPL(dasd_free_block);
3045