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[PATCH] fix compile regression for a few scsi drivers
[linux-block.git] / drivers / s390 / cio / device_fsm.c
CommitLineData
1da177e4
LT		 1/*
2 * drivers/s390/cio/device_fsm.c
3 * finite state machine for device handling
4 *
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
4ce3b30c 7 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4
LT		 8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 */
10
11#include <linux/module.h>
1da177e4 12#include <linux/init.h>
4e57b681
TS		 13#include <linux/jiffies.h>
14#include <linux/string.h>
1da177e4
LT		 15
16#include <asm/ccwdev.h>
4c24da79 17#include <asm/cio.h>
1da177e4
LT		 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"
1da177e4
LT		 25
26int
27device_is_online(struct subchannel *sch)
28{
29 struct ccw_device *cdev;
30
31 if (!sch->dev.driver_data)
32 return 0;
33 cdev = sch->dev.driver_data;
34 return (cdev->private->state == DEV_STATE_ONLINE);
35}
36
37int
38device_is_disconnected(struct subchannel *sch)
39{
40 struct ccw_device *cdev;
41
42 if (!sch->dev.driver_data)
43 return 0;
44 cdev = sch->dev.driver_data;
45 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
46 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
47}
48
49void
50device_set_disconnected(struct subchannel *sch)
51{
52 struct ccw_device *cdev;
53
54 if (!sch->dev.driver_data)
55 return;
56 cdev = sch->dev.driver_data;
57 ccw_device_set_timeout(cdev, 0);
58 cdev->private->flags.fake_irb = 0;
59 cdev->private->state = DEV_STATE_DISCONNECTED;
60}
61
62void
63device_set_waiting(struct subchannel *sch)
64{
65 struct ccw_device *cdev;
66
67 if (!sch->dev.driver_data)
68 return;
69 cdev = sch->dev.driver_data;
70 ccw_device_set_timeout(cdev, 10*HZ);
71 cdev->private->state = DEV_STATE_WAIT4IO;
72}
73
74/*
75 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
76 */
77static void
78ccw_device_timeout(unsigned long data)
79{
80 struct ccw_device *cdev;
81
82 cdev = (struct ccw_device *) data;
83 spin_lock_irq(cdev->ccwlock);
84 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
85 spin_unlock_irq(cdev->ccwlock);
86}
87
88/*
89 * Set timeout
90 */
91void
92ccw_device_set_timeout(struct ccw_device *cdev, int expires)
93{
94 if (expires == 0) {
95 del_timer(&cdev->private->timer);
96 return;
97 }
98 if (timer_pending(&cdev->private->timer)) {
99 if (mod_timer(&cdev->private->timer, jiffies + expires))
100 return;
101 }
102 cdev->private->timer.function = ccw_device_timeout;
103 cdev->private->timer.data = (unsigned long) cdev;
104 cdev->private->timer.expires = jiffies + expires;
105 add_timer(&cdev->private->timer);
106}
107
108/* Kill any pending timers after machine check. */
109void
110device_kill_pending_timer(struct subchannel *sch)
111{
112 struct ccw_device *cdev;
113
114 if (!sch->dev.driver_data)
115 return;
116 cdev = sch->dev.driver_data;
117 ccw_device_set_timeout(cdev, 0);
118}
119
120/*
121 * Cancel running i/o. This is called repeatedly since halt/clear are
122 * asynchronous operations. We do one try with cio_cancel, two tries
123 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
124 * Returns 0 if device now idle, -ENODEV for device not operational and
125 * -EBUSY if an interrupt is expected (either from halt/clear or from a
126 * status pending).
127 */
128int
129ccw_device_cancel_halt_clear(struct ccw_device *cdev)
130{
131 struct subchannel *sch;
132 int ret;
133
134 sch = to_subchannel(cdev->dev.parent);
a8237fc4 135 ret = stsch(sch->schid, &sch->schib);
1da177e4
LT		 136 if (ret || !sch->schib.pmcw.dnv)
137 return -ENODEV;
138 if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
139 /* Not operational or no activity -> done. */
140 return 0;
141 /* Stage 1: cancel io. */
142 if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
143 !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
144 ret = cio_cancel(sch);
145 if (ret != -EINVAL)
146 return ret;
147 /* cancel io unsuccessful. From now on it is asynchronous. */
148 cdev->private->iretry = 3; /* 3 halt retries. */
149 }
150 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
151 /* Stage 2: halt io. */
152 if (cdev->private->iretry) {
153 cdev->private->iretry--;
154 ret = cio_halt(sch);
155 return (ret == 0) ? -EBUSY : ret;
156 }
157 /* halt io unsuccessful. */
158 cdev->private->iretry = 255; /* 255 clear retries. */
159 }
160 /* Stage 3: clear io. */
161 if (cdev->private->iretry) {
162 cdev->private->iretry--;
163 ret = cio_clear (sch);
164 return (ret == 0) ? -EBUSY : ret;
165 }
166 panic("Can't stop i/o on subchannel.\n");
167}
168
169static int
170ccw_device_handle_oper(struct ccw_device *cdev)
171{
172 struct subchannel *sch;
173
174 sch = to_subchannel(cdev->dev.parent);
175 cdev->private->flags.recog_done = 1;
176 /*
177 * Check if cu type and device type still match. If
178 * not, it is certainly another device and we have to
179 * de- and re-register. Also check here for non-matching devno.
180 */
181 if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
182 cdev->id.cu_model != cdev->private->senseid.cu_model ||
183 cdev->id.dev_type != cdev->private->senseid.dev_type ||
184 cdev->id.dev_model != cdev->private->senseid.dev_model ||
185 cdev->private->devno != sch->schib.pmcw.dev) {
186 PREPARE_WORK(&cdev->private->kick_work,
187 ccw_device_do_unreg_rereg, (void *)cdev);
188 queue_work(ccw_device_work, &cdev->private->kick_work);
189 return 0;
190 }
191 cdev->private->flags.donotify = 1;
192 return 1;
193}
194
195/*
196 * The machine won't give us any notification by machine check if a chpid has
197 * been varied online on the SE so we have to find out by magic (i. e. driving
198 * the channel subsystem to device selection and updating our path masks).
199 */
200static inline void
201__recover_lost_chpids(struct subchannel *sch, int old_lpm)
202{
203 int mask, i;
204
205 for (i = 0; i<8; i++) {
206 mask = 0x80 >> i;
207 if (!(sch->lpm & mask))
208 continue;
209 if (old_lpm & mask)
210 continue;
211 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
212 }
213}
214
215/*
216 * Stop device recognition.
217 */
218static void
219ccw_device_recog_done(struct ccw_device *cdev, int state)
220{
221 struct subchannel *sch;
222 int notify, old_lpm, same_dev;
223
224 sch = to_subchannel(cdev->dev.parent);
225
226 ccw_device_set_timeout(cdev, 0);
227 cio_disable_subchannel(sch);
228 /*
229 * Now that we tried recognition, we have performed device selection
230 * through ssch() and the path information is up to date.
231 */
232 old_lpm = sch->lpm;
a8237fc4 233 stsch(sch->schid, &sch->schib);
1da177e4
LT		 234 sch->lpm = sch->schib.pmcw.pim &
235 sch->schib.pmcw.pam &
236 sch->schib.pmcw.pom &
237 sch->opm;
4ffa9234
CH		 238 /* Check since device may again have become not operational. */
239 if (!sch->schib.pmcw.dnv)
240 state = DEV_STATE_NOT_OPER;
1da177e4
LT		 241 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
242 /* Force reprobe on all chpids. */
243 old_lpm = 0;
244 if (sch->lpm != old_lpm)
245 __recover_lost_chpids(sch, old_lpm);
246 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
247 if (state == DEV_STATE_NOT_OPER) {
248 cdev->private->flags.recog_done = 1;
249 cdev->private->state = DEV_STATE_DISCONNECTED;
250 return;
251 }
252 /* Boxed devices don't need extra treatment. */
253 }
254 notify = 0;
255 same_dev = 0; /* Keep the compiler quiet... */
256 switch (state) {
257 case DEV_STATE_NOT_OPER:
258 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5
CH		 259 "SenseID : unknown device %04x on subchannel "
260 "0.%x.%04x\n", cdev->private->devno,
261 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 262 break;
263 case DEV_STATE_OFFLINE:
264 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
265 same_dev = ccw_device_handle_oper(cdev);
266 notify = 1;
267 }
268 /* fill out sense information */
269 cdev->id = (struct ccw_device_id) {
270 .cu_type = cdev->private->senseid.cu_type,
271 .cu_model = cdev->private->senseid.cu_model,
272 .dev_type = cdev->private->senseid.dev_type,
273 .dev_model = cdev->private->senseid.dev_model,
274 };
275 if (notify) {
276 cdev->private->state = DEV_STATE_OFFLINE;
277 if (same_dev) {
278 /* Get device online again. */
279 ccw_device_online(cdev);
280 wake_up(&cdev->private->wait_q);
281 }
282 return;
283 }
284 /* Issue device info message. */
fb6958a5 285 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
1da177e4 286 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
fb6958a5
CH		 287 "%04X/%02X\n",
288 cdev->private->ssid, cdev->private->devno,
1da177e4
LT		 289 cdev->id.cu_type, cdev->id.cu_model,
290 cdev->id.dev_type, cdev->id.dev_model);
291 break;
292 case DEV_STATE_BOXED:
293 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5
CH		 294 "SenseID : boxed device %04x on subchannel "
295 "0.%x.%04x\n", cdev->private->devno,
296 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 297 break;
298 }
299 cdev->private->state = state;
300 io_subchannel_recog_done(cdev);
301 if (state != DEV_STATE_NOT_OPER)
302 wake_up(&cdev->private->wait_q);
303}
304
305/*
306 * Function called from device_id.c after sense id has completed.
307 */
308void
309ccw_device_sense_id_done(struct ccw_device *cdev, int err)
310{
311 switch (err) {
312 case 0:
313 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
314 break;
315 case -ETIME: /* Sense id stopped by timeout. */
316 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
317 break;
318 default:
319 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
320 break;
321 }
322}
323
324static void
325ccw_device_oper_notify(void *data)
326{
327 struct ccw_device *cdev;
328 struct subchannel *sch;
329 int ret;
330
331 cdev = (struct ccw_device *)data;
332 sch = to_subchannel(cdev->dev.parent);
333 ret = (sch->driver && sch->driver->notify) ?
334 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
335 if (!ret)
336 /* Driver doesn't want device back. */
337 ccw_device_do_unreg_rereg((void *)cdev);
94bb0633
CH		 338 else {
339 /* Reenable channel measurements, if needed. */
340 cmf_reenable(cdev);
1da177e4 341 wake_up(&cdev->private->wait_q);
94bb0633 342 }
1da177e4
LT		 343}
344
345/*
346 * Finished with online/offline processing.
347 */
348static void
349ccw_device_done(struct ccw_device *cdev, int state)
350{
351 struct subchannel *sch;
352
353 sch = to_subchannel(cdev->dev.parent);
354
355 if (state != DEV_STATE_ONLINE)
356 cio_disable_subchannel(sch);
357
358 /* Reset device status. */
359 memset(&cdev->private->irb, 0, sizeof(struct irb));
360
361 cdev->private->state = state;
362
363
364 if (state == DEV_STATE_BOXED)
365 CIO_DEBUG(KERN_WARNING, 2,
366 "Boxed device %04x on subchannel %04x\n",
a8237fc4 367 cdev->private->devno, sch->schid.sch_no);
1da177e4
LT		 368
369 if (cdev->private->flags.donotify) {
370 cdev->private->flags.donotify = 0;
371 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
372 (void *)cdev);
373 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
374 }
375 wake_up(&cdev->private->wait_q);
376
377 if (css_init_done && state != DEV_STATE_ONLINE)
378 put_device (&cdev->dev);
379}
380
7e560814
CH		 381static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
382{
383 char *c1;
384 char *c2;
385
386 c1 = (char *)p1;
387 c2 = (char *)p2;
388
389 return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
390}
391
392static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
393{
394 int i;
395 int last;
396
397 last = 0;
398 for (i = 0; i < 8; i++) {
399 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
400 /* No PGID yet */
401 continue;
402 if (cdev->private->pgid[last].inf.ps.state1 ==
403 SNID_STATE1_RESET) {
404 /* First non-zero PGID */
405 last = i;
406 continue;
407 }
408 if (cmp_pgid(&cdev->private->pgid[i],
409 &cdev->private->pgid[last]) == 0)
410 /* Non-conflicting PGIDs */
411 continue;
412
413 /* PGID mismatch, can't pathgroup. */
414 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
415 "0.%x.%04x, can't pathgroup\n",
416 cdev->private->ssid, cdev->private->devno);
417 cdev->private->options.pgroup = 0;
418 return;
419 }
420 if (cdev->private->pgid[last].inf.ps.state1 ==
421 SNID_STATE1_RESET)
422 /* No previous pgid found */
423 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
424 sizeof(struct pgid));
425 else
426 /* Use existing pgid */
427 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
428 sizeof(struct pgid));
429}
430
1da177e4
LT		 431/*
432 * Function called from device_pgid.c after sense path ground has completed.
433 */
434void
435ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
436{
437 struct subchannel *sch;
438
439 sch = to_subchannel(cdev->dev.parent);
440 switch (err) {
7e560814
CH		 441 case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
442 cdev->private->options.pgroup = 0;
443 break;
444 case 0: /* success */
445 case -EACCES: /* partial success, some paths not operational */
446 /* Check if all pgids are equal or 0. */
447 __ccw_device_get_common_pgid(cdev);
1da177e4
LT		 448 break;
449 case -ETIME: /* Sense path group id stopped by timeout. */
450 case -EUSERS: /* device is reserved for someone else. */
451 ccw_device_done(cdev, DEV_STATE_BOXED);
7e560814 452 return;
1da177e4
LT		 453 default:
454 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
7e560814 455 return;
1da177e4 456 }
7e560814
CH		 457 /* Start Path Group verification. */
458 sch->vpm = 0; /* Start with no path groups set. */
459 cdev->private->state = DEV_STATE_VERIFY;
460 ccw_device_verify_start(cdev);
1da177e4
LT		 461}
462
463/*
464 * Start device recognition.
465 */
466int
467ccw_device_recognition(struct ccw_device *cdev)
468{
469 struct subchannel *sch;
470 int ret;
471
472 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
473 (cdev->private->state != DEV_STATE_BOXED))
474 return -EINVAL;
475 sch = to_subchannel(cdev->dev.parent);
476 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
477 if (ret != 0)
478 /* Couldn't enable the subchannel for i/o. Sick device. */
479 return ret;
480
481 /* After 60s the device recognition is considered to have failed. */
482 ccw_device_set_timeout(cdev, 60*HZ);
483
484 /*
485 * We used to start here with a sense pgid to find out whether a device
486 * is locked by someone else. Unfortunately, the sense pgid command
487 * code has other meanings on devices predating the path grouping
488 * algorithm, so we start with sense id and box the device after an
489 * timeout (or if sense pgid during path verification detects the device
490 * is locked, as may happen on newer devices).
491 */
492 cdev->private->flags.recog_done = 0;
493 cdev->private->state = DEV_STATE_SENSE_ID;
494 ccw_device_sense_id_start(cdev);
495 return 0;
496}
497
498/*
499 * Handle timeout in device recognition.
500 */
501static void
502ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
503{
504 int ret;
505
506 ret = ccw_device_cancel_halt_clear(cdev);
507 switch (ret) {
508 case 0:
509 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
510 break;
511 case -ENODEV:
512 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
513 break;
514 default:
515 ccw_device_set_timeout(cdev, 3*HZ);
516 }
517}
518
519
520static void
521ccw_device_nopath_notify(void *data)
522{
523 struct ccw_device *cdev;
524 struct subchannel *sch;
525 int ret;
526
527 cdev = (struct ccw_device *)data;
528 sch = to_subchannel(cdev->dev.parent);
529 /* Extra sanity. */
530 if (sch->lpm)
531 return;
532 ret = (sch->driver && sch->driver->notify) ?
533 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
534 if (!ret) {
535 if (get_device(&sch->dev)) {
536 /* Driver doesn't want to keep device. */
537 cio_disable_subchannel(sch);
538 if (get_device(&cdev->dev)) {
539 PREPARE_WORK(&cdev->private->kick_work,
540 ccw_device_call_sch_unregister,
541 (void *)cdev);
542 queue_work(ccw_device_work,
543 &cdev->private->kick_work);
544 } else
545 put_device(&sch->dev);
546 }
547 } else {
548 cio_disable_subchannel(sch);
549 ccw_device_set_timeout(cdev, 0);
550 cdev->private->flags.fake_irb = 0;
551 cdev->private->state = DEV_STATE_DISCONNECTED;
552 wake_up(&cdev->private->wait_q);
553 }
554}
555
556void
557ccw_device_verify_done(struct ccw_device *cdev, int err)
558{
559 cdev->private->flags.doverify = 0;
560 switch (err) {
561 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
562 cdev->private->options.pgroup = 0;
563 case 0:
564 ccw_device_done(cdev, DEV_STATE_ONLINE);
565 /* Deliver fake irb to device driver, if needed. */
566 if (cdev->private->flags.fake_irb) {
567 memset(&cdev->private->irb, 0, sizeof(struct irb));
568 cdev->private->irb.scsw = (struct scsw) {
569 .cc = 1,
570 .fctl = SCSW_FCTL_START_FUNC,
571 .actl = SCSW_ACTL_START_PEND,
572 .stctl = SCSW_STCTL_STATUS_PEND,
573 };
574 cdev->private->flags.fake_irb = 0;
575 if (cdev->handler)
576 cdev->handler(cdev, cdev->private->intparm,
577 &cdev->private->irb);
578 memset(&cdev->private->irb, 0, sizeof(struct irb));
579 }
580 break;
581 case -ETIME:
582 ccw_device_done(cdev, DEV_STATE_BOXED);
583 break;
584 default:
585 PREPARE_WORK(&cdev->private->kick_work,
586 ccw_device_nopath_notify, (void *)cdev);
587 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
588 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
589 break;
590 }
591}
592
593/*
594 * Get device online.
595 */
596int
597ccw_device_online(struct ccw_device *cdev)
598{
599 struct subchannel *sch;
600 int ret;
601
602 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
603 (cdev->private->state != DEV_STATE_BOXED))
604 return -EINVAL;
605 sch = to_subchannel(cdev->dev.parent);
606 if (css_init_done && !get_device(&cdev->dev))
607 return -ENODEV;
608 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
609 if (ret != 0) {
610 /* Couldn't enable the subchannel for i/o. Sick device. */
611 if (ret == -ENODEV)
612 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
613 return ret;
614 }
615 /* Do we want to do path grouping? */
616 if (!cdev->private->options.pgroup) {
7e560814
CH		 617 /* Start initial path verification. */
618 cdev->private->state = DEV_STATE_VERIFY;
619 ccw_device_verify_start(cdev);
1da177e4
LT		 620 return 0;
621 }
622 /* Do a SensePGID first. */
623 cdev->private->state = DEV_STATE_SENSE_PGID;
624 ccw_device_sense_pgid_start(cdev);
625 return 0;
626}
627
628void
629ccw_device_disband_done(struct ccw_device *cdev, int err)
630{
631 switch (err) {
632 case 0:
633 ccw_device_done(cdev, DEV_STATE_OFFLINE);
634 break;
635 case -ETIME:
636 ccw_device_done(cdev, DEV_STATE_BOXED);
637 break;
638 default:
639 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
640 break;
641 }
642}
643
644/*
645 * Shutdown device.
646 */
647int
648ccw_device_offline(struct ccw_device *cdev)
649{
650 struct subchannel *sch;
651
652 sch = to_subchannel(cdev->dev.parent);
a8237fc4 653 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
1da177e4
LT		 654 return -ENODEV;
655 if (cdev->private->state != DEV_STATE_ONLINE) {
656 if (sch->schib.scsw.actl != 0)
657 return -EBUSY;
658 return -EINVAL;
659 }
660 if (sch->schib.scsw.actl != 0)
661 return -EBUSY;
662 /* Are we doing path grouping? */
663 if (!cdev->private->options.pgroup) {
664 /* No, set state offline immediately. */
7e560814 665 sch->vpm = 0;
1da177e4
LT		 666 ccw_device_done(cdev, DEV_STATE_OFFLINE);
667 return 0;
668 }
669 /* Start Set Path Group commands. */
670 cdev->private->state = DEV_STATE_DISBAND_PGID;
671 ccw_device_disband_start(cdev);
672 return 0;
673}
674
675/*
676 * Handle timeout in device online/offline process.
677 */
678static void
679ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
680{
681 int ret;
682
683 ret = ccw_device_cancel_halt_clear(cdev);
684 switch (ret) {
685 case 0:
686 ccw_device_done(cdev, DEV_STATE_BOXED);
687 break;
688 case -ENODEV:
689 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
690 break;
691 default:
692 ccw_device_set_timeout(cdev, 3*HZ);
693 }
694}
695
696/*
697 * Handle not oper event in device recognition.
698 */
699static void
700ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
701{
702 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
703}
704
705/*
706 * Handle not operational event while offline.
707 */
708static void
709ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
710{
711 struct subchannel *sch;
712
713 cdev->private->state = DEV_STATE_NOT_OPER;
714 sch = to_subchannel(cdev->dev.parent);
715 if (get_device(&cdev->dev)) {
716 PREPARE_WORK(&cdev->private->kick_work,
717 ccw_device_call_sch_unregister, (void *)cdev);
718 queue_work(ccw_device_work, &cdev->private->kick_work);
719 }
720 wake_up(&cdev->private->wait_q);
721}
722
723/*
724 * Handle not operational event while online.
725 */
726static void
727ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
728{
729 struct subchannel *sch;
730
731 sch = to_subchannel(cdev->dev.parent);
732 if (sch->driver->notify &&
733 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
734 ccw_device_set_timeout(cdev, 0);
735 cdev->private->flags.fake_irb = 0;
736 cdev->private->state = DEV_STATE_DISCONNECTED;
737 wake_up(&cdev->private->wait_q);
738 return;
739 }
740 cdev->private->state = DEV_STATE_NOT_OPER;
741 cio_disable_subchannel(sch);
742 if (sch->schib.scsw.actl != 0) {
743 // FIXME: not-oper indication to device driver ?
744 ccw_device_call_handler(cdev);
745 }
746 if (get_device(&cdev->dev)) {
747 PREPARE_WORK(&cdev->private->kick_work,
748 ccw_device_call_sch_unregister, (void *)cdev);
749 queue_work(ccw_device_work, &cdev->private->kick_work);
750 }
751 wake_up(&cdev->private->wait_q);
752}
753
754/*
755 * Handle path verification event.
756 */
757static void
758ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
759{
760 struct subchannel *sch;
761
1da177e4
LT		 762 if (cdev->private->state == DEV_STATE_W4SENSE) {
763 cdev->private->flags.doverify = 1;
764 return;
765 }
766 sch = to_subchannel(cdev->dev.parent);
767 /*
768 * Since we might not just be coming from an interrupt from the
769 * subchannel we have to update the schib.
770 */
a8237fc4 771 stsch(sch->schid, &sch->schib);
1da177e4
LT		 772
773 if (sch->schib.scsw.actl != 0 ||
774 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
775 /*
776 * No final status yet or final status not yet delivered
777 * to the device driver. Can't do path verfication now,
778 * delay until final status was delivered.
779 */
780 cdev->private->flags.doverify = 1;
781 return;
782 }
783 /* Device is idle, we can do the path verification. */
784 cdev->private->state = DEV_STATE_VERIFY;
785 ccw_device_verify_start(cdev);
786}
787
788/*
789 * Got an interrupt for a normal io (state online).
790 */
791static void
792ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
793{
794 struct irb *irb;
795
796 irb = (struct irb *) __LC_IRB;
797 /* Check for unsolicited interrupt. */
798 if ((irb->scsw.stctl ==
799 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
800 && (!irb->scsw.cc)) {
801 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
802 !irb->esw.esw0.erw.cons) {
803 /* Unit check but no sense data. Need basic sense. */
804 if (ccw_device_do_sense(cdev, irb) != 0)
805 goto call_handler_unsol;
e0ec5749 806 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 807 cdev->private->state = DEV_STATE_W4SENSE;
808 cdev->private->intparm = 0;
809 return;
810 }
811call_handler_unsol:
812 if (cdev->handler)
813 cdev->handler (cdev, 0, irb);
814 return;
815 }
816 /* Accumulate status and find out if a basic sense is needed. */
817 ccw_device_accumulate_irb(cdev, irb);
818 if (cdev->private->flags.dosense) {
819 if (ccw_device_do_sense(cdev, irb) == 0) {
820 cdev->private->state = DEV_STATE_W4SENSE;
821 }
822 return;
823 }
824 /* Call the handler. */
825 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
826 /* Start delayed path verification. */
827 ccw_device_online_verify(cdev, 0);
828}
829
830/*
831 * Got an timeout in online state.
832 */
833static void
834ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
835{
836 int ret;
837
838 ccw_device_set_timeout(cdev, 0);
839 ret = ccw_device_cancel_halt_clear(cdev);
840 if (ret == -EBUSY) {
841 ccw_device_set_timeout(cdev, 3*HZ);
842 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
843 return;
844 }
845 if (ret == -ENODEV) {
846 struct subchannel *sch;
847
848 sch = to_subchannel(cdev->dev.parent);
849 if (!sch->lpm) {
850 PREPARE_WORK(&cdev->private->kick_work,
851 ccw_device_nopath_notify, (void *)cdev);
852 queue_work(ccw_device_notify_work,
853 &cdev->private->kick_work);
854 } else
855 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
856 } else if (cdev->handler)
857 cdev->handler(cdev, cdev->private->intparm,
858 ERR_PTR(-ETIMEDOUT));
859}
860
861/*
862 * Got an interrupt for a basic sense.
863 */
864void
865ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
866{
867 struct irb *irb;
868
869 irb = (struct irb *) __LC_IRB;
870 /* Check for unsolicited interrupt. */
871 if (irb->scsw.stctl ==
872 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
873 if (irb->scsw.cc == 1)
874 /* Basic sense hasn't started. Try again. */
875 ccw_device_do_sense(cdev, irb);
876 else {
877 printk("Huh? %s(%s): unsolicited interrupt...\n",
878 __FUNCTION__, cdev->dev.bus_id);
879 if (cdev->handler)
880 cdev->handler (cdev, 0, irb);
881 }
882 return;
883 }
3ba1998e
CH		 884 /*
885 * Check if a halt or clear has been issued in the meanwhile. If yes,
886 * only deliver the halt/clear interrupt to the device driver as if it
887 * had killed the original request.
888 */
889 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
890 cdev->private->flags.dosense = 0;
891 memset(&cdev->private->irb, 0, sizeof(struct irb));
892 ccw_device_accumulate_irb(cdev, irb);
893 goto call_handler;
894 }
1da177e4
LT		 895 /* Add basic sense info to irb. */
896 ccw_device_accumulate_basic_sense(cdev, irb);
897 if (cdev->private->flags.dosense) {
898 /* Another basic sense is needed. */
899 ccw_device_do_sense(cdev, irb);
900 return;
901 }
3ba1998e 902call_handler:
1da177e4
LT		 903 cdev->private->state = DEV_STATE_ONLINE;
904 /* Call the handler. */
905 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
906 /* Start delayed path verification. */
907 ccw_device_online_verify(cdev, 0);
908}
909
910static void
911ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
912{
913 struct irb *irb;
914
915 irb = (struct irb *) __LC_IRB;
916 /* Accumulate status. We don't do basic sense. */
917 ccw_device_accumulate_irb(cdev, irb);
b4f7b1ee
CH		 918 /* Remember to clear irb to avoid residuals. */
919 memset(&cdev->private->irb, 0, sizeof(struct irb));
1da177e4
LT		 920 /* Try to start delayed device verification. */
921 ccw_device_online_verify(cdev, 0);
922 /* Note: Don't call handler for cio initiated clear! */
923}
924
925static void
926ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
927{
928 struct subchannel *sch;
929
930 sch = to_subchannel(cdev->dev.parent);
931 ccw_device_set_timeout(cdev, 0);
932 /* OK, i/o is dead now. Call interrupt handler. */
933 cdev->private->state = DEV_STATE_ONLINE;
934 if (cdev->handler)
935 cdev->handler(cdev, cdev->private->intparm,
936 ERR_PTR(-ETIMEDOUT));
937 if (!sch->lpm) {
938 PREPARE_WORK(&cdev->private->kick_work,
939 ccw_device_nopath_notify, (void *)cdev);
940 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
941 } else if (cdev->private->flags.doverify)
942 /* Start delayed path verification. */
943 ccw_device_online_verify(cdev, 0);
944}
945
946static void
947ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
948{
949 int ret;
950
951 ret = ccw_device_cancel_halt_clear(cdev);
952 if (ret == -EBUSY) {
953 ccw_device_set_timeout(cdev, 3*HZ);
954 return;
955 }
956 if (ret == -ENODEV) {
957 struct subchannel *sch;
958
959 sch = to_subchannel(cdev->dev.parent);
960 if (!sch->lpm) {
961 PREPARE_WORK(&cdev->private->kick_work,
962 ccw_device_nopath_notify, (void *)cdev);
963 queue_work(ccw_device_notify_work,
964 &cdev->private->kick_work);
965 } else
966 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
967 return;
968 }
969 //FIXME: Can we get here?
970 cdev->private->state = DEV_STATE_ONLINE;
971 if (cdev->handler)
972 cdev->handler(cdev, cdev->private->intparm,
973 ERR_PTR(-ETIMEDOUT));
974}
975
976static void
977ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
978{
979 struct irb *irb;
980 struct subchannel *sch;
981
982 irb = (struct irb *) __LC_IRB;
983 /*
984 * Accumulate status and find out if a basic sense is needed.
985 * This is fine since we have already adapted the lpm.
986 */
987 ccw_device_accumulate_irb(cdev, irb);
988 if (cdev->private->flags.dosense) {
989 if (ccw_device_do_sense(cdev, irb) == 0) {
990 cdev->private->state = DEV_STATE_W4SENSE;
991 }
992 return;
993 }
994
995 /* Iff device is idle, reset timeout. */
996 sch = to_subchannel(cdev->dev.parent);
a8237fc4 997 if (!stsch(sch->schid, &sch->schib))
1da177e4
LT		 998 if (sch->schib.scsw.actl == 0)
999 ccw_device_set_timeout(cdev, 0);
1000 /* Call the handler. */
1001 ccw_device_call_handler(cdev);
1002 if (!sch->lpm) {
1003 PREPARE_WORK(&cdev->private->kick_work,
1004 ccw_device_nopath_notify, (void *)cdev);
1005 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1006 } else if (cdev->private->flags.doverify)
1007 ccw_device_online_verify(cdev, 0);
1008}
1009
1010static void
1011ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1012{
1013 int ret;
1014 struct subchannel *sch;
1015
1016 sch = to_subchannel(cdev->dev.parent);
1017 ccw_device_set_timeout(cdev, 0);
1018 ret = ccw_device_cancel_halt_clear(cdev);
1019 if (ret == -EBUSY) {
1020 ccw_device_set_timeout(cdev, 3*HZ);
1021 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1022 return;
1023 }
1024 if (ret == -ENODEV) {
1025 if (!sch->lpm) {
1026 PREPARE_WORK(&cdev->private->kick_work,
1027 ccw_device_nopath_notify, (void *)cdev);
1028 queue_work(ccw_device_notify_work,
1029 &cdev->private->kick_work);
1030 } else
1031 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1032 return;
1033 }
1034 if (cdev->handler)
1035 cdev->handler(cdev, cdev->private->intparm,
1036 ERR_PTR(-ETIMEDOUT));
1037 if (!sch->lpm) {
1038 PREPARE_WORK(&cdev->private->kick_work,
1039 ccw_device_nopath_notify, (void *)cdev);
1040 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1041 } else if (cdev->private->flags.doverify)
1042 /* Start delayed path verification. */
1043 ccw_device_online_verify(cdev, 0);
1044}
1045
1046static void
1047ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1048{
1049 /* When the I/O has terminated, we have to start verification. */
7e560814 1050 cdev->private->flags.doverify = 1;
1da177e4
LT		 1051}
1052
1053static void
1054ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1055{
1056 struct irb *irb;
1057
1058 switch (dev_event) {
1059 case DEV_EVENT_INTERRUPT:
1060 irb = (struct irb *) __LC_IRB;
1061 /* Check for unsolicited interrupt. */
1062 if ((irb->scsw.stctl ==
1063 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1064 (!irb->scsw.cc))
1065 /* FIXME: we should restart stlck here, but this
1066 * is extremely unlikely ... */
1067 goto out_wakeup;
1068
1069 ccw_device_accumulate_irb(cdev, irb);
1070 /* We don't care about basic sense etc. */
1071 break;
1072 default: /* timeout */
1073 break;
1074 }
1075out_wakeup:
1076 wake_up(&cdev->private->wait_q);
1077}
1078
1079static void
1080ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1081{
1082 struct subchannel *sch;
1083
1084 sch = to_subchannel(cdev->dev.parent);
1085 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1086 /* Couldn't enable the subchannel for i/o. Sick device. */
1087 return;
1088
1089 /* After 60s the device recognition is considered to have failed. */
1090 ccw_device_set_timeout(cdev, 60*HZ);
1091
1092 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1093 ccw_device_sense_id_start(cdev);
1094}
1095
1096void
1097device_trigger_reprobe(struct subchannel *sch)
1098{
1099 struct ccw_device *cdev;
1100
1101 if (!sch->dev.driver_data)
1102 return;
1103 cdev = sch->dev.driver_data;
1104 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1105 return;
1106
1107 /* Update some values. */
a8237fc4 1108 if (stsch(sch->schid, &sch->schib))
1da177e4
LT		 1109 return;
1110
1111 /*
1112 * The pim, pam, pom values may not be accurate, but they are the best
1113 * we have before performing device selection :/
1114 */
1115 sch->lpm = sch->schib.pmcw.pim &
1116 sch->schib.pmcw.pam &
1117 sch->schib.pmcw.pom &
1118 sch->opm;
1119 /* Re-set some bits in the pmcw that were lost. */
1120 sch->schib.pmcw.isc = 3;
1121 sch->schib.pmcw.csense = 1;
1122 sch->schib.pmcw.ena = 0;
1123 if ((sch->lpm & (sch->lpm - 1)) != 0)
1124 sch->schib.pmcw.mp = 1;
1125 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1126 /* We should also udate ssd info, but this has to wait. */
1127 ccw_device_start_id(cdev, 0);
1128}
1129
1130static void
1131ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1132{
1133 struct subchannel *sch;
1134
1135 sch = to_subchannel(cdev->dev.parent);
1136 /*
1137 * An interrupt in state offline means a previous disable was not
1138 * successful. Try again.
1139 */
1140 cio_disable_subchannel(sch);
1141}
1142
1143static void
1144ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1145{
1146 retry_set_schib(cdev);
1147 cdev->private->state = DEV_STATE_ONLINE;
1148 dev_fsm_event(cdev, dev_event);
1149}
1150
94bb0633
CH		 1151static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1152 enum dev_event dev_event)
1153{
1154 cmf_retry_copy_block(cdev);
1155 cdev->private->state = DEV_STATE_ONLINE;
1156 dev_fsm_event(cdev, dev_event);
1157}
1da177e4
LT		 1158
1159static void
1160ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1161{
1162 ccw_device_set_timeout(cdev, 0);
1163 if (dev_event == DEV_EVENT_NOTOPER)
1164 cdev->private->state = DEV_STATE_NOT_OPER;
1165 else
1166 cdev->private->state = DEV_STATE_OFFLINE;
1167 wake_up(&cdev->private->wait_q);
1168}
1169
1170static void
1171ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1172{
1173 int ret;
1174
1175 ret = ccw_device_cancel_halt_clear(cdev);
1176 switch (ret) {
1177 case 0:
1178 cdev->private->state = DEV_STATE_OFFLINE;
1179 wake_up(&cdev->private->wait_q);
1180 break;
1181 case -ENODEV:
1182 cdev->private->state = DEV_STATE_NOT_OPER;
1183 wake_up(&cdev->private->wait_q);
1184 break;
1185 default:
1186 ccw_device_set_timeout(cdev, HZ/10);
1187 }
1188}
1189
1190/*
1191 * No operation action. This is used e.g. to ignore a timeout event in
1192 * state offline.
1193 */
1194static void
1195ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1196{
1197}
1198
1199/*
1200 * Bug operation action.
1201 */
1202static void
1203ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1204{
1205 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1206 cdev->private->state, dev_event);
1207 BUG();
1208}
1209
1210/*
1211 * device statemachine
1212 */
1213fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1214 [DEV_STATE_NOT_OPER] = {
1215 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1216 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1217 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1218 [DEV_EVENT_VERIFY] = ccw_device_nop,
1219 },
1220 [DEV_STATE_SENSE_PGID] = {
1221 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1222 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1223 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1224 [DEV_EVENT_VERIFY] = ccw_device_nop,
1225 },
1226 [DEV_STATE_SENSE_ID] = {
1227 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1228 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1229 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1230 [DEV_EVENT_VERIFY] = ccw_device_nop,
1231 },
1232 [DEV_STATE_OFFLINE] = {
1233 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1234 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1235 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1236 [DEV_EVENT_VERIFY] = ccw_device_nop,
1237 },
1238 [DEV_STATE_VERIFY] = {
1239 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1240 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1241 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1242 [DEV_EVENT_VERIFY] = ccw_device_nop,
1243 },
1244 [DEV_STATE_ONLINE] = {
1245 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1246 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1247 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1248 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1249 },
1250 [DEV_STATE_W4SENSE] = {
1251 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1252 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1253 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1254 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1255 },
1256 [DEV_STATE_DISBAND_PGID] = {
1257 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1258 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1259 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1260 [DEV_EVENT_VERIFY] = ccw_device_nop,
1261 },
1262 [DEV_STATE_BOXED] = {
1263 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1264 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1265 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1266 [DEV_EVENT_VERIFY] = ccw_device_nop,
1267 },
1268 /* states to wait for i/o completion before doing something */
1269 [DEV_STATE_CLEAR_VERIFY] = {
1270 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1271 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1272 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1273 [DEV_EVENT_VERIFY] = ccw_device_nop,
1274 },
1275 [DEV_STATE_TIMEOUT_KILL] = {
1276 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1277 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1278 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1279 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1280 },
1281 [DEV_STATE_WAIT4IO] = {
1282 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1283 [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq,
1284 [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout,
1285 [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify,
1286 },
1287 [DEV_STATE_QUIESCE] = {
1288 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1289 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1290 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1291 [DEV_EVENT_VERIFY] = ccw_device_nop,
1292 },
1293 /* special states for devices gone not operational */
1294 [DEV_STATE_DISCONNECTED] = {
1295 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1296 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1297 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
1298 [DEV_EVENT_VERIFY] = ccw_device_nop,
1299 },
1300 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1301 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1302 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1303 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1304 [DEV_EVENT_VERIFY] = ccw_device_nop,
1305 },
1306 [DEV_STATE_CMFCHANGE] = {
1307 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1308 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1309 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1310 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1311 },
94bb0633
CH		 1312 [DEV_STATE_CMFUPDATE] = {
1313 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1314 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1315 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1316 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1317 },
1da177e4
LT		 1318};
1319
1320/*
1321 * io_subchannel_irq is called for "real" interrupts or for status
1322 * pending conditions on msch.
1323 */
1324void
1325io_subchannel_irq (struct device *pdev)
1326{
1327 struct ccw_device *cdev;
1328
1329 cdev = to_subchannel(pdev)->dev.driver_data;
1330
1331 CIO_TRACE_EVENT (3, "IRQ");
1332 CIO_TRACE_EVENT (3, pdev->bus_id);
1333 if (cdev)
1334 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1335}
1336
1337EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
Linux 6.x block layer and io_uring tree(s)