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9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/jiffies.h>
13#include <linux/string.h>
14
15#include <asm/ccwdev.h>
16#include <asm/cio.h>
17#include <asm/chpid.h>
18
19#include "cio.h"
20#include "cio_debug.h"
21#include "css.h"
22#include "device.h"
23#include "chsc.h"
24#include "ioasm.h"
25#include "chp.h"
26
27static int timeout_log_enabled;
28
29static int __init ccw_timeout_log_setup(char *unused)
30{
31 timeout_log_enabled = 1;
32 return 1;
33}
34
35__setup("ccw_timeout_log", ccw_timeout_log_setup);
36
37static void ccw_timeout_log(struct ccw_device *cdev)
38{
39 struct schib schib;
40 struct subchannel *sch;
41 struct io_subchannel_private *private;
42 union orb *orb;
43 int cc;
44
45 sch = to_subchannel(cdev->dev.parent);
46 private = to_io_private(sch);
47 orb = &private->orb;
48 cc = stsch_err(sch->schid, &schib);
49
50 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
51 "device information:\n", get_clock());
52 printk(KERN_WARNING "cio: orb:\n");
53 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
54 orb, sizeof(*orb), 0);
55 printk(KERN_WARNING "cio: ccw device bus id: %s\n",
56 dev_name(&cdev->dev));
57 printk(KERN_WARNING "cio: subchannel bus id: %s\n",
58 dev_name(&sch->dev));
59 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
60 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
61
62 if (orb->tm.b) {
63 printk(KERN_WARNING "cio: orb indicates transport mode\n");
64 printk(KERN_WARNING "cio: last tcw:\n");
65 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
66 (void *)(addr_t)orb->tm.tcw,
67 sizeof(struct tcw), 0);
68 } else {
69 printk(KERN_WARNING "cio: orb indicates command mode\n");
70 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
71 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
72 printk(KERN_WARNING "cio: last channel program "
73 "(intern):\n");
74 else
75 printk(KERN_WARNING "cio: last channel program:\n");
76
77 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
78 (void *)(addr_t)orb->cmd.cpa,
79 sizeof(struct ccw1), 0);
80 }
81 printk(KERN_WARNING "cio: ccw device state: %d\n",
82 cdev->private->state);
83 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
84 printk(KERN_WARNING "cio: schib:\n");
85 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
86 &schib, sizeof(schib), 0);
87 printk(KERN_WARNING "cio: ccw device flags:\n");
88 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
89 &cdev->private->flags, sizeof(cdev->private->flags), 0);
90}
91
92
93
94
95static void
96ccw_device_timeout(unsigned long data)
97{
98 struct ccw_device *cdev;
99
100 cdev = (struct ccw_device *) data;
101 spin_lock_irq(cdev->ccwlock);
102 if (timeout_log_enabled)
103 ccw_timeout_log(cdev);
104 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
105 spin_unlock_irq(cdev->ccwlock);
106}
107
108
109
110
111void
112ccw_device_set_timeout(struct ccw_device *cdev, int expires)
113{
114 if (expires == 0) {
115 del_timer(&cdev->private->timer);
116 return;
117 }
118 if (timer_pending(&cdev->private->timer)) {
119 if (mod_timer(&cdev->private->timer, jiffies + expires))
120 return;
121 }
122 cdev->private->timer.function = ccw_device_timeout;
123 cdev->private->timer.data = (unsigned long) cdev;
124 cdev->private->timer.expires = jiffies + expires;
125 add_timer(&cdev->private->timer);
126}
127
128
129
130
131
132
133
134
135
136int
137ccw_device_cancel_halt_clear(struct ccw_device *cdev)
138{
139 struct subchannel *sch;
140 int ret;
141
142 sch = to_subchannel(cdev->dev.parent);
143 if (cio_update_schib(sch))
144 return -ENODEV;
145 if (!sch->schib.pmcw.ena)
146
147 return 0;
148
149 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
150 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
151 if (!scsw_is_tm(&sch->schib.scsw)) {
152 ret = cio_cancel(sch);
153 if (ret != -EINVAL)
154 return ret;
155 }
156
157
158 cdev->private->iretry = 3;
159 }
160 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
161
162 if (cdev->private->iretry) {
163 cdev->private->iretry--;
164 ret = cio_halt(sch);
165 if (ret != -EBUSY)
166 return (ret == 0) ? -EBUSY : ret;
167 }
168
169 cdev->private->iretry = 255;
170 }
171
172 if (cdev->private->iretry) {
173 cdev->private->iretry--;
174 ret = cio_clear (sch);
175 return (ret == 0) ? -EBUSY : ret;
176 }
177
178 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n",
179 cdev->private->dev_id.ssid, cdev->private->dev_id.devno);
180 return -EIO;
181}
182
183void ccw_device_update_sense_data(struct ccw_device *cdev)
184{
185 memset(&cdev->id, 0, sizeof(cdev->id));
186 cdev->id.cu_type = cdev->private->senseid.cu_type;
187 cdev->id.cu_model = cdev->private->senseid.cu_model;
188 cdev->id.dev_type = cdev->private->senseid.dev_type;
189 cdev->id.dev_model = cdev->private->senseid.dev_model;
190}
191
192int ccw_device_test_sense_data(struct ccw_device *cdev)
193{
194 return cdev->id.cu_type == cdev->private->senseid.cu_type &&
195 cdev->id.cu_model == cdev->private->senseid.cu_model &&
196 cdev->id.dev_type == cdev->private->senseid.dev_type &&
197 cdev->id.dev_model == cdev->private->senseid.dev_model;
198}
199
200
201
202
203
204
205static void
206__recover_lost_chpids(struct subchannel *sch, int old_lpm)
207{
208 int mask, i;
209 struct chp_id chpid;
210
211 chp_id_init(&chpid);
212 for (i = 0; i<8; i++) {
213 mask = 0x80 >> i;
214 if (!(sch->lpm & mask))
215 continue;
216 if (old_lpm & mask)
217 continue;
218 chpid.id = sch->schib.pmcw.chpid[i];
219 if (!chp_is_registered(chpid))
220 css_schedule_eval_all();
221 }
222}
223
224
225
226
227static void
228ccw_device_recog_done(struct ccw_device *cdev, int state)
229{
230 struct subchannel *sch;
231 int old_lpm;
232
233 sch = to_subchannel(cdev->dev.parent);
234
235 if (cio_disable_subchannel(sch))
236 state = DEV_STATE_NOT_OPER;
237
238
239
240
241 old_lpm = sch->lpm;
242
243
244 if (cio_update_schib(sch))
245 state = DEV_STATE_NOT_OPER;
246 else
247 sch->lpm = sch->schib.pmcw.pam & sch->opm;
248
249 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
250
251 old_lpm = 0;
252 if (sch->lpm != old_lpm)
253 __recover_lost_chpids(sch, old_lpm);
254 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
255 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
256 cdev->private->flags.recog_done = 1;
257 cdev->private->state = DEV_STATE_DISCONNECTED;
258 wake_up(&cdev->private->wait_q);
259 return;
260 }
261 if (cdev->private->flags.resuming) {
262 cdev->private->state = state;
263 cdev->private->flags.recog_done = 1;
264 wake_up(&cdev->private->wait_q);
265 return;
266 }
267 switch (state) {
268 case DEV_STATE_NOT_OPER:
269 break;
270 case DEV_STATE_OFFLINE:
271 if (!cdev->online) {
272 ccw_device_update_sense_data(cdev);
273 break;
274 }
275 cdev->private->state = DEV_STATE_OFFLINE;
276 cdev->private->flags.recog_done = 1;
277 if (ccw_device_test_sense_data(cdev)) {
278 cdev->private->flags.donotify = 1;
279 ccw_device_online(cdev);
280 wake_up(&cdev->private->wait_q);
281 } else {
282 ccw_device_update_sense_data(cdev);
283 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
284 }
285 return;
286 case DEV_STATE_BOXED:
287 if (cdev->id.cu_type != 0) {
288 cdev->private->flags.recog_done = 1;
289 cdev->private->state = DEV_STATE_BOXED;
290 wake_up(&cdev->private->wait_q);
291 return;
292 }
293 break;
294 }
295 cdev->private->state = state;
296 io_subchannel_recog_done(cdev);
297 wake_up(&cdev->private->wait_q);
298}
299
300
301
302
303void
304ccw_device_sense_id_done(struct ccw_device *cdev, int err)
305{
306 switch (err) {
307 case 0:
308 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
309 break;
310 case -ETIME:
311 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
312 break;
313 default:
314 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
315 break;
316 }
317}
318
319
320
321
322
323
324
325
326
327
328
329
330int ccw_device_notify(struct ccw_device *cdev, int event)
331{
332 int ret = -EINVAL;
333
334 if (!cdev->drv)
335 goto out;
336 if (!cdev->online)
337 goto out;
338 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
339 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
340 event);
341 if (!cdev->drv->notify) {
342 ret = -EOPNOTSUPP;
343 goto out;
344 }
345 if (cdev->drv->notify(cdev, event))
346 ret = NOTIFY_OK;
347 else
348 ret = NOTIFY_BAD;
349out:
350 return ret;
351}
352
353static void ccw_device_oper_notify(struct ccw_device *cdev)
354{
355 struct subchannel *sch = to_subchannel(cdev->dev.parent);
356
357 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
358
359 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
360
361 cdev->private->path_new_mask = sch->vpm;
362 return;
363 }
364
365 ccw_device_set_notoper(cdev);
366 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
367}
368
369
370
371
372static void
373ccw_device_done(struct ccw_device *cdev, int state)
374{
375 struct subchannel *sch;
376
377 sch = to_subchannel(cdev->dev.parent);
378
379 ccw_device_set_timeout(cdev, 0);
380
381 if (state != DEV_STATE_ONLINE)
382 cio_disable_subchannel(sch);
383
384
385 memset(&cdev->private->irb, 0, sizeof(struct irb));
386
387 cdev->private->state = state;
388
389 switch (state) {
390 case DEV_STATE_BOXED:
391 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
392 cdev->private->dev_id.devno, sch->schid.sch_no);
393 if (cdev->online &&
394 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK)
395 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
396 cdev->private->flags.donotify = 0;
397 break;
398 case DEV_STATE_NOT_OPER:
399 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
400 cdev->private->dev_id.devno, sch->schid.sch_no);
401 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
402 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
403 else
404 ccw_device_set_disconnected(cdev);
405 cdev->private->flags.donotify = 0;
406 break;
407 case DEV_STATE_DISCONNECTED:
408 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
409 "%04x\n", cdev->private->dev_id.devno,
410 sch->schid.sch_no);
411 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) {
412 cdev->private->state = DEV_STATE_NOT_OPER;
413 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
414 } else
415 ccw_device_set_disconnected(cdev);
416 cdev->private->flags.donotify = 0;
417 break;
418 default:
419 break;
420 }
421
422 if (cdev->private->flags.donotify) {
423 cdev->private->flags.donotify = 0;
424 ccw_device_oper_notify(cdev);
425 }
426 wake_up(&cdev->private->wait_q);
427}
428
429
430
431
432void ccw_device_recognition(struct ccw_device *cdev)
433{
434 struct subchannel *sch = to_subchannel(cdev->dev.parent);
435
436
437
438
439
440
441
442
443
444 cdev->private->flags.recog_done = 0;
445 cdev->private->state = DEV_STATE_SENSE_ID;
446 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
447 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
448 return;
449 }
450 ccw_device_sense_id_start(cdev);
451}
452
453
454
455
456static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
457{
458 switch (e) {
459 case DEV_EVENT_NOTOPER:
460 ccw_request_notoper(cdev);
461 break;
462 case DEV_EVENT_INTERRUPT:
463 ccw_request_handler(cdev);
464 break;
465 case DEV_EVENT_TIMEOUT:
466 ccw_request_timeout(cdev);
467 break;
468 default:
469 break;
470 }
471}
472
473static void ccw_device_report_path_events(struct ccw_device *cdev)
474{
475 struct subchannel *sch = to_subchannel(cdev->dev.parent);
476 int path_event[8];
477 int chp, mask;
478
479 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
480 path_event[chp] = PE_NONE;
481 if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
482 path_event[chp] |= PE_PATH_GONE;
483 if (mask & cdev->private->path_new_mask & sch->vpm)
484 path_event[chp] |= PE_PATH_AVAILABLE;
485 if (mask & cdev->private->pgid_reset_mask & sch->vpm)
486 path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
487 }
488 if (cdev->online && cdev->drv->path_event)
489 cdev->drv->path_event(cdev, path_event);
490}
491
492static void ccw_device_reset_path_events(struct ccw_device *cdev)
493{
494 cdev->private->path_gone_mask = 0;
495 cdev->private->path_new_mask = 0;
496 cdev->private->pgid_reset_mask = 0;
497}
498
499static void create_fake_irb(struct irb *irb, int type)
500{
501 memset(irb, 0, sizeof(*irb));
502 if (type == FAKE_CMD_IRB) {
503 struct cmd_scsw *scsw = &irb->scsw.cmd;
504 scsw->cc = 1;
505 scsw->fctl = SCSW_FCTL_START_FUNC;
506 scsw->actl = SCSW_ACTL_START_PEND;
507 scsw->stctl = SCSW_STCTL_STATUS_PEND;
508 } else if (type == FAKE_TM_IRB) {
509 struct tm_scsw *scsw = &irb->scsw.tm;
510 scsw->x = 1;
511 scsw->cc = 1;
512 scsw->fctl = SCSW_FCTL_START_FUNC;
513 scsw->actl = SCSW_ACTL_START_PEND;
514 scsw->stctl = SCSW_STCTL_STATUS_PEND;
515 }
516}
517
518void ccw_device_verify_done(struct ccw_device *cdev, int err)
519{
520 struct subchannel *sch;
521
522 sch = to_subchannel(cdev->dev.parent);
523
524 if (cio_update_schib(sch)) {
525 err = -ENODEV;
526 goto callback;
527 }
528
529 sch->lpm = sch->vpm;
530
531 if (cdev->private->flags.doverify) {
532 ccw_device_verify_start(cdev);
533 return;
534 }
535callback:
536 switch (err) {
537 case 0:
538 ccw_device_done(cdev, DEV_STATE_ONLINE);
539
540 if (cdev->private->flags.fake_irb) {
541 create_fake_irb(&cdev->private->irb,
542 cdev->private->flags.fake_irb);
543 cdev->private->flags.fake_irb = 0;
544 if (cdev->handler)
545 cdev->handler(cdev, cdev->private->intparm,
546 &cdev->private->irb);
547 memset(&cdev->private->irb, 0, sizeof(struct irb));
548 }
549 ccw_device_report_path_events(cdev);
550 break;
551 case -ETIME:
552 case -EUSERS:
553
554 cdev->private->flags.donotify = 0;
555 ccw_device_done(cdev, DEV_STATE_BOXED);
556 break;
557 case -EACCES:
558
559 cdev->private->flags.donotify = 0;
560 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
561 break;
562 default:
563
564 cdev->private->flags.donotify = 0;
565 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
566 break;
567 }
568 ccw_device_reset_path_events(cdev);
569}
570
571
572
573
574int
575ccw_device_online(struct ccw_device *cdev)
576{
577 struct subchannel *sch;
578 int ret;
579
580 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
581 (cdev->private->state != DEV_STATE_BOXED))
582 return -EINVAL;
583 sch = to_subchannel(cdev->dev.parent);
584 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
585 if (ret != 0) {
586
587 if (ret == -ENODEV)
588 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
589 return ret;
590 }
591
592 cdev->private->state = DEV_STATE_VERIFY;
593 ccw_device_verify_start(cdev);
594 return 0;
595}
596
597void
598ccw_device_disband_done(struct ccw_device *cdev, int err)
599{
600 switch (err) {
601 case 0:
602 ccw_device_done(cdev, DEV_STATE_OFFLINE);
603 break;
604 case -ETIME:
605 ccw_device_done(cdev, DEV_STATE_BOXED);
606 break;
607 default:
608 cdev->private->flags.donotify = 0;
609 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
610 break;
611 }
612}
613
614
615
616
617int
618ccw_device_offline(struct ccw_device *cdev)
619{
620 struct subchannel *sch;
621
622
623 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
624 cdev->private->state == DEV_STATE_NOT_OPER) {
625 cdev->private->flags.donotify = 0;
626 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
627 return 0;
628 }
629 if (cdev->private->state == DEV_STATE_BOXED) {
630 ccw_device_done(cdev, DEV_STATE_BOXED);
631 return 0;
632 }
633 if (ccw_device_is_orphan(cdev)) {
634 ccw_device_done(cdev, DEV_STATE_OFFLINE);
635 return 0;
636 }
637 sch = to_subchannel(cdev->dev.parent);
638 if (cio_update_schib(sch))
639 return -ENODEV;
640 if (scsw_actl(&sch->schib.scsw) != 0)
641 return -EBUSY;
642 if (cdev->private->state != DEV_STATE_ONLINE)
643 return -EINVAL;
644
645 if (!cdev->private->flags.pgroup) {
646
647 ccw_device_done(cdev, DEV_STATE_OFFLINE);
648 return 0;
649 }
650
651 cdev->private->state = DEV_STATE_DISBAND_PGID;
652 ccw_device_disband_start(cdev);
653 return 0;
654}
655
656
657
658
659static void ccw_device_generic_notoper(struct ccw_device *cdev,
660 enum dev_event dev_event)
661{
662 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
663 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
664 else
665 ccw_device_set_disconnected(cdev);
666}
667
668
669
670
671static void ccw_device_offline_verify(struct ccw_device *cdev,
672 enum dev_event dev_event)
673{
674 struct subchannel *sch = to_subchannel(cdev->dev.parent);
675
676 css_schedule_eval(sch->schid);
677}
678
679
680
681
682static void
683ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
684{
685 struct subchannel *sch;
686
687 if (cdev->private->state == DEV_STATE_W4SENSE) {
688 cdev->private->flags.doverify = 1;
689 return;
690 }
691 sch = to_subchannel(cdev->dev.parent);
692
693
694
695
696 if (cio_update_schib(sch)) {
697 ccw_device_verify_done(cdev, -ENODEV);
698 return;
699 }
700
701 if (scsw_actl(&sch->schib.scsw) != 0 ||
702 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
703 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
704
705
706
707
708
709 cdev->private->flags.doverify = 1;
710 return;
711 }
712
713 cdev->private->state = DEV_STATE_VERIFY;
714 ccw_device_verify_start(cdev);
715}
716
717
718
719
720static void ccw_device_boxed_verify(struct ccw_device *cdev,
721 enum dev_event dev_event)
722{
723 struct subchannel *sch = to_subchannel(cdev->dev.parent);
724
725 if (cdev->online) {
726 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
727 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
728 else
729 ccw_device_online_verify(cdev, dev_event);
730 } else
731 css_schedule_eval(sch->schid);
732}
733
734
735
736
737static void
738ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
739{
740 struct irb *irb;
741 int is_cmd;
742
743 irb = (struct irb *)&S390_lowcore.irb;
744 is_cmd = !scsw_is_tm(&irb->scsw);
745
746 if (!scsw_is_solicited(&irb->scsw)) {
747 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
748 !irb->esw.esw0.erw.cons) {
749
750 if (ccw_device_do_sense(cdev, irb) != 0)
751 goto call_handler_unsol;
752 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
753 cdev->private->state = DEV_STATE_W4SENSE;
754 cdev->private->intparm = 0;
755 return;
756 }
757call_handler_unsol:
758 if (cdev->handler)
759 cdev->handler (cdev, 0, irb);
760 if (cdev->private->flags.doverify)
761 ccw_device_online_verify(cdev, 0);
762 return;
763 }
764
765 ccw_device_accumulate_irb(cdev, irb);
766 if (is_cmd && cdev->private->flags.dosense) {
767 if (ccw_device_do_sense(cdev, irb) == 0) {
768 cdev->private->state = DEV_STATE_W4SENSE;
769 }
770 return;
771 }
772
773 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
774
775 ccw_device_online_verify(cdev, 0);
776}
777
778
779
780
781static void
782ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
783{
784 int ret;
785
786 ccw_device_set_timeout(cdev, 0);
787 cdev->private->iretry = 255;
788 ret = ccw_device_cancel_halt_clear(cdev);
789 if (ret == -EBUSY) {
790 ccw_device_set_timeout(cdev, 3*HZ);
791 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
792 return;
793 }
794 if (ret)
795 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
796 else if (cdev->handler)
797 cdev->handler(cdev, cdev->private->intparm,
798 ERR_PTR(-ETIMEDOUT));
799}
800
801
802
803
804static void
805ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
806{
807 struct irb *irb;
808
809 irb = (struct irb *)&S390_lowcore.irb;
810
811 if (scsw_stctl(&irb->scsw) ==
812 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
813 if (scsw_cc(&irb->scsw) == 1)
814
815 ccw_device_do_sense(cdev, irb);
816 else {
817 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
818 "interrupt during w4sense...\n",
819 cdev->private->dev_id.ssid,
820 cdev->private->dev_id.devno);
821 if (cdev->handler)
822 cdev->handler (cdev, 0, irb);
823 }
824 return;
825 }
826
827
828
829
830
831 if (scsw_fctl(&irb->scsw) &
832 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
833 cdev->private->flags.dosense = 0;
834 memset(&cdev->private->irb, 0, sizeof(struct irb));
835 ccw_device_accumulate_irb(cdev, irb);
836 goto call_handler;
837 }
838
839 ccw_device_accumulate_basic_sense(cdev, irb);
840 if (cdev->private->flags.dosense) {
841
842 ccw_device_do_sense(cdev, irb);
843 return;
844 }
845call_handler:
846 cdev->private->state = DEV_STATE_ONLINE;
847
848 wake_up(&cdev->private->wait_q);
849
850 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
851
852 ccw_device_online_verify(cdev, 0);
853}
854
855static void
856ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
857{
858 ccw_device_set_timeout(cdev, 0);
859
860 ccw_device_online_verify(cdev, 0);
861
862 if (cdev->handler)
863 cdev->handler(cdev, cdev->private->intparm,
864 ERR_PTR(-EIO));
865}
866
867static void
868ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
869{
870 int ret;
871
872 ret = ccw_device_cancel_halt_clear(cdev);
873 if (ret == -EBUSY) {
874 ccw_device_set_timeout(cdev, 3*HZ);
875 return;
876 }
877
878 ccw_device_online_verify(cdev, 0);
879 if (cdev->handler)
880 cdev->handler(cdev, cdev->private->intparm,
881 ERR_PTR(-EIO));
882}
883
884void ccw_device_kill_io(struct ccw_device *cdev)
885{
886 int ret;
887
888 cdev->private->iretry = 255;
889 ret = ccw_device_cancel_halt_clear(cdev);
890 if (ret == -EBUSY) {
891 ccw_device_set_timeout(cdev, 3*HZ);
892 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
893 return;
894 }
895
896 ccw_device_online_verify(cdev, 0);
897 if (cdev->handler)
898 cdev->handler(cdev, cdev->private->intparm,
899 ERR_PTR(-EIO));
900}
901
902static void
903ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
904{
905
906 cdev->private->flags.doverify = 1;
907}
908
909static void
910ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
911{
912 struct subchannel *sch;
913
914 sch = to_subchannel(cdev->dev.parent);
915 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
916
917 return;
918 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
919 ccw_device_sense_id_start(cdev);
920}
921
922void ccw_device_trigger_reprobe(struct ccw_device *cdev)
923{
924 struct subchannel *sch;
925
926 if (cdev->private->state != DEV_STATE_DISCONNECTED)
927 return;
928
929 sch = to_subchannel(cdev->dev.parent);
930
931 if (cio_update_schib(sch))
932 return;
933
934
935
936
937 sch->lpm = sch->schib.pmcw.pam & sch->opm;
938
939
940
941
942 io_subchannel_init_config(sch);
943 if (cio_commit_config(sch))
944 return;
945
946
947
948 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
949 css_schedule_eval(sch->schid);
950 else
951 ccw_device_start_id(cdev, 0);
952}
953
954static void ccw_device_disabled_irq(struct ccw_device *cdev,
955 enum dev_event dev_event)
956{
957 struct subchannel *sch;
958
959 sch = to_subchannel(cdev->dev.parent);
960
961
962
963
964 cio_disable_subchannel(sch);
965}
966
967static void
968ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
969{
970 retry_set_schib(cdev);
971 cdev->private->state = DEV_STATE_ONLINE;
972 dev_fsm_event(cdev, dev_event);
973}
974
975static void ccw_device_update_cmfblock(struct ccw_device *cdev,
976 enum dev_event dev_event)
977{
978 cmf_retry_copy_block(cdev);
979 cdev->private->state = DEV_STATE_ONLINE;
980 dev_fsm_event(cdev, dev_event);
981}
982
983static void
984ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
985{
986 ccw_device_set_timeout(cdev, 0);
987 cdev->private->state = DEV_STATE_NOT_OPER;
988 wake_up(&cdev->private->wait_q);
989}
990
991static void
992ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
993{
994 int ret;
995
996 ret = ccw_device_cancel_halt_clear(cdev);
997 if (ret == -EBUSY) {
998 ccw_device_set_timeout(cdev, HZ/10);
999 } else {
1000 cdev->private->state = DEV_STATE_NOT_OPER;
1001 wake_up(&cdev->private->wait_q);
1002 }
1003}
1004
1005
1006
1007
1008
1009static void
1010ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1011{
1012}
1013
1014
1015
1016
1017fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1018 [DEV_STATE_NOT_OPER] = {
1019 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1020 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1021 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1022 [DEV_EVENT_VERIFY] = ccw_device_nop,
1023 },
1024 [DEV_STATE_SENSE_PGID] = {
1025 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1026 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1027 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1028 [DEV_EVENT_VERIFY] = ccw_device_nop,
1029 },
1030 [DEV_STATE_SENSE_ID] = {
1031 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1032 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1033 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1034 [DEV_EVENT_VERIFY] = ccw_device_nop,
1035 },
1036 [DEV_STATE_OFFLINE] = {
1037 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1038 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1039 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1040 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1041 },
1042 [DEV_STATE_VERIFY] = {
1043 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1044 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1045 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1046 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1047 },
1048 [DEV_STATE_ONLINE] = {
1049 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1050 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1051 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1052 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1053 },
1054 [DEV_STATE_W4SENSE] = {
1055 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1056 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1057 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1058 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1059 },
1060 [DEV_STATE_DISBAND_PGID] = {
1061 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1062 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1063 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1064 [DEV_EVENT_VERIFY] = ccw_device_nop,
1065 },
1066 [DEV_STATE_BOXED] = {
1067 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1068 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
1069 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1070 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1071 },
1072
1073 [DEV_STATE_TIMEOUT_KILL] = {
1074 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1075 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1076 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1077 [DEV_EVENT_VERIFY] = ccw_device_nop,
1078 },
1079 [DEV_STATE_QUIESCE] = {
1080 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1081 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1082 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1083 [DEV_EVENT_VERIFY] = ccw_device_nop,
1084 },
1085
1086 [DEV_STATE_DISCONNECTED] = {
1087 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1088 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1089 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1090 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1091 },
1092 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1093 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1094 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1095 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1096 [DEV_EVENT_VERIFY] = ccw_device_nop,
1097 },
1098 [DEV_STATE_CMFCHANGE] = {
1099 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1100 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1101 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1102 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1103 },
1104 [DEV_STATE_CMFUPDATE] = {
1105 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1106 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1107 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1108 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1109 },
1110 [DEV_STATE_STEAL_LOCK] = {
1111 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1112 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1113 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1114 [DEV_EVENT_VERIFY] = ccw_device_nop,
1115 },
1116};
1117
1118EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
1119