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[S390] workqueue fixes.
[deliverable/linux.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
d23861ff
CH		 62void device_set_intretry(struct subchannel *sch)
63{
64 struct ccw_device *cdev;
65
66 cdev = sch->dev.driver_data;
67 if (!cdev)
68 return;
69 cdev->private->flags.intretry = 1;
70}
71
24cb5b48
CH		 72int device_trigger_verify(struct subchannel *sch)
73{
74 struct ccw_device *cdev;
75
76 cdev = sch->dev.driver_data;
77 if (!cdev || !cdev->online)
78 return -EINVAL;
79 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
80 return 0;
81}
82
1da177e4
LT		 83/*
84 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
85 */
86static void
87ccw_device_timeout(unsigned long data)
88{
89 struct ccw_device *cdev;
90
91 cdev = (struct ccw_device *) data;
92 spin_lock_irq(cdev->ccwlock);
93 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
94 spin_unlock_irq(cdev->ccwlock);
95}
96
97/*
98 * Set timeout
99 */
100void
101ccw_device_set_timeout(struct ccw_device *cdev, int expires)
102{
103 if (expires == 0) {
104 del_timer(&cdev->private->timer);
105 return;
106 }
107 if (timer_pending(&cdev->private->timer)) {
108 if (mod_timer(&cdev->private->timer, jiffies + expires))
109 return;
110 }
111 cdev->private->timer.function = ccw_device_timeout;
112 cdev->private->timer.data = (unsigned long) cdev;
113 cdev->private->timer.expires = jiffies + expires;
114 add_timer(&cdev->private->timer);
115}
116
117/* Kill any pending timers after machine check. */
118void
119device_kill_pending_timer(struct subchannel *sch)
120{
121 struct ccw_device *cdev;
122
123 if (!sch->dev.driver_data)
124 return;
125 cdev = sch->dev.driver_data;
126 ccw_device_set_timeout(cdev, 0);
127}
128
129/*
130 * Cancel running i/o. This is called repeatedly since halt/clear are
131 * asynchronous operations. We do one try with cio_cancel, two tries
132 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
133 * Returns 0 if device now idle, -ENODEV for device not operational and
134 * -EBUSY if an interrupt is expected (either from halt/clear or from a
135 * status pending).
136 */
137int
138ccw_device_cancel_halt_clear(struct ccw_device *cdev)
139{
140 struct subchannel *sch;
141 int ret;
142
143 sch = to_subchannel(cdev->dev.parent);
a8237fc4 144 ret = stsch(sch->schid, &sch->schib);
1da177e4
LT		 145 if (ret || !sch->schib.pmcw.dnv)
146 return -ENODEV;
147 if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
148 /* Not operational or no activity -> done. */
149 return 0;
150 /* Stage 1: cancel io. */
151 if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
152 !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
153 ret = cio_cancel(sch);
154 if (ret != -EINVAL)
155 return ret;
156 /* cancel io unsuccessful. From now on it is asynchronous. */
157 cdev->private->iretry = 3; /* 3 halt retries. */
158 }
159 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
160 /* Stage 2: halt io. */
161 if (cdev->private->iretry) {
162 cdev->private->iretry--;
163 ret = cio_halt(sch);
ba4ba8a6
PO		 164 if (ret != -EBUSY)
165 return (ret == 0) ? -EBUSY : ret;
1da177e4
LT		 166 }
167 /* halt io unsuccessful. */
168 cdev->private->iretry = 255; /* 255 clear retries. */
169 }
170 /* Stage 3: clear io. */
171 if (cdev->private->iretry) {
172 cdev->private->iretry--;
173 ret = cio_clear (sch);
174 return (ret == 0) ? -EBUSY : ret;
175 }
176 panic("Can't stop i/o on subchannel.\n");
177}
178
179static int
180ccw_device_handle_oper(struct ccw_device *cdev)
181{
182 struct subchannel *sch;
183
184 sch = to_subchannel(cdev->dev.parent);
185 cdev->private->flags.recog_done = 1;
186 /*
187 * Check if cu type and device type still match. If
188 * not, it is certainly another device and we have to
189 * de- and re-register. Also check here for non-matching devno.
190 */
191 if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
192 cdev->id.cu_model != cdev->private->senseid.cu_model ||
193 cdev->id.dev_type != cdev->private->senseid.dev_type ||
194 cdev->id.dev_model != cdev->private->senseid.dev_model ||
78964268 195 cdev->private->dev_id.devno != sch->schib.pmcw.dev) {
1da177e4 196 PREPARE_WORK(&cdev->private->kick_work,
12975aef 197 ccw_device_do_unreg_rereg, cdev);
1da177e4
LT		 198 queue_work(ccw_device_work, &cdev->private->kick_work);
199 return 0;
200 }
201 cdev->private->flags.donotify = 1;
202 return 1;
203}
204
205/*
206 * The machine won't give us any notification by machine check if a chpid has
207 * been varied online on the SE so we have to find out by magic (i. e. driving
208 * the channel subsystem to device selection and updating our path masks).
209 */
210static inline void
211__recover_lost_chpids(struct subchannel *sch, int old_lpm)
212{
213 int mask, i;
214
215 for (i = 0; i<8; i++) {
216 mask = 0x80 >> i;
217 if (!(sch->lpm & mask))
218 continue;
219 if (old_lpm & mask)
220 continue;
221 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
222 }
223}
224
225/*
226 * Stop device recognition.
227 */
228static void
229ccw_device_recog_done(struct ccw_device *cdev, int state)
230{
231 struct subchannel *sch;
232 int notify, old_lpm, same_dev;
233
234 sch = to_subchannel(cdev->dev.parent);
235
236 ccw_device_set_timeout(cdev, 0);
237 cio_disable_subchannel(sch);
238 /*
239 * Now that we tried recognition, we have performed device selection
240 * through ssch() and the path information is up to date.
241 */
242 old_lpm = sch->lpm;
a8237fc4 243 stsch(sch->schid, &sch->schib);
28bdc6f6 244 sch->lpm = sch->schib.pmcw.pam & sch->opm;
4ffa9234
CH		 245 /* Check since device may again have become not operational. */
246 if (!sch->schib.pmcw.dnv)
247 state = DEV_STATE_NOT_OPER;
1da177e4
LT		 248 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
249 /* Force reprobe on all chpids. */
250 old_lpm = 0;
251 if (sch->lpm != old_lpm)
252 __recover_lost_chpids(sch, old_lpm);
253 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
254 if (state == DEV_STATE_NOT_OPER) {
255 cdev->private->flags.recog_done = 1;
256 cdev->private->state = DEV_STATE_DISCONNECTED;
257 return;
258 }
259 /* Boxed devices don't need extra treatment. */
260 }
261 notify = 0;
262 same_dev = 0; /* Keep the compiler quiet... */
263 switch (state) {
264 case DEV_STATE_NOT_OPER:
265 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5 266 "SenseID : unknown device %04x on subchannel "
78964268 267 "0.%x.%04x\n", cdev->private->dev_id.devno,
fb6958a5 268 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 269 break;
270 case DEV_STATE_OFFLINE:
271 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
272 same_dev = ccw_device_handle_oper(cdev);
273 notify = 1;
274 }
275 /* fill out sense information */
81388d2a 276 memset(&cdev->id, 0, sizeof(cdev->id));
292888c8
HC		 277 cdev->id.cu_type = cdev->private->senseid.cu_type;
278 cdev->id.cu_model = cdev->private->senseid.cu_model;
279 cdev->id.dev_type = cdev->private->senseid.dev_type;
280 cdev->id.dev_model = cdev->private->senseid.dev_model;
1da177e4
LT		 281 if (notify) {
282 cdev->private->state = DEV_STATE_OFFLINE;
283 if (same_dev) {
284 /* Get device online again. */
285 ccw_device_online(cdev);
286 wake_up(&cdev->private->wait_q);
287 }
288 return;
289 }
290 /* Issue device info message. */
fb6958a5 291 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
1da177e4 292 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
fb6958a5 293 "%04X/%02X\n",
78964268
CH		 294 cdev->private->dev_id.ssid,
295 cdev->private->dev_id.devno,
1da177e4
LT		 296 cdev->id.cu_type, cdev->id.cu_model,
297 cdev->id.dev_type, cdev->id.dev_model);
298 break;
299 case DEV_STATE_BOXED:
300 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5 301 "SenseID : boxed device %04x on subchannel "
78964268 302 "0.%x.%04x\n", cdev->private->dev_id.devno,
fb6958a5 303 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 304 break;
305 }
306 cdev->private->state = state;
307 io_subchannel_recog_done(cdev);
308 if (state != DEV_STATE_NOT_OPER)
309 wake_up(&cdev->private->wait_q);
310}
311
312/*
313 * Function called from device_id.c after sense id has completed.
314 */
315void
316ccw_device_sense_id_done(struct ccw_device *cdev, int err)
317{
318 switch (err) {
319 case 0:
320 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
321 break;
322 case -ETIME: /* Sense id stopped by timeout. */
323 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
324 break;
325 default:
326 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
327 break;
328 }
329}
330
331static void
332ccw_device_oper_notify(void *data)
333{
334 struct ccw_device *cdev;
335 struct subchannel *sch;
336 int ret;
337
12975aef 338 cdev = data;
1da177e4
LT		 339 sch = to_subchannel(cdev->dev.parent);
340 ret = (sch->driver && sch->driver->notify) ?
341 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
342 if (!ret)
343 /* Driver doesn't want device back. */
12975aef 344 ccw_device_do_unreg_rereg(cdev);
94bb0633
CH		 345 else {
346 /* Reenable channel measurements, if needed. */
347 cmf_reenable(cdev);
1da177e4 348 wake_up(&cdev->private->wait_q);
94bb0633 349 }
1da177e4
LT		 350}
351
352/*
353 * Finished with online/offline processing.
354 */
355static void
356ccw_device_done(struct ccw_device *cdev, int state)
357{
358 struct subchannel *sch;
359
360 sch = to_subchannel(cdev->dev.parent);
361
f1ee3281
CH		 362 ccw_device_set_timeout(cdev, 0);
363
1da177e4
LT		 364 if (state != DEV_STATE_ONLINE)
365 cio_disable_subchannel(sch);
366
367 /* Reset device status. */
368 memset(&cdev->private->irb, 0, sizeof(struct irb));
369
370 cdev->private->state = state;
371
372
373 if (state == DEV_STATE_BOXED)
374 CIO_DEBUG(KERN_WARNING, 2,
375 "Boxed device %04x on subchannel %04x\n",
78964268 376 cdev->private->dev_id.devno, sch->schid.sch_no);
1da177e4
LT		 377
378 if (cdev->private->flags.donotify) {
379 cdev->private->flags.donotify = 0;
380 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
12975aef 381 cdev);
1da177e4
LT		 382 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
383 }
384 wake_up(&cdev->private->wait_q);
385
386 if (css_init_done && state != DEV_STATE_ONLINE)
387 put_device (&cdev->dev);
388}
389
7e560814
CH		 390static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
391{
392 char *c1;
393 char *c2;
394
395 c1 = (char *)p1;
396 c2 = (char *)p2;
397
398 return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
399}
400
401static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
402{
403 int i;
404 int last;
405
406 last = 0;
407 for (i = 0; i < 8; i++) {
408 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
409 /* No PGID yet */
410 continue;
411 if (cdev->private->pgid[last].inf.ps.state1 ==
412 SNID_STATE1_RESET) {
413 /* First non-zero PGID */
414 last = i;
415 continue;
416 }
417 if (cmp_pgid(&cdev->private->pgid[i],
418 &cdev->private->pgid[last]) == 0)
419 /* Non-conflicting PGIDs */
420 continue;
421
422 /* PGID mismatch, can't pathgroup. */
423 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
424 "0.%x.%04x, can't pathgroup\n",
78964268
CH		 425 cdev->private->dev_id.ssid,
426 cdev->private->dev_id.devno);
7e560814
CH		 427 cdev->private->options.pgroup = 0;
428 return;
429 }
430 if (cdev->private->pgid[last].inf.ps.state1 ==
431 SNID_STATE1_RESET)
432 /* No previous pgid found */
433 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
434 sizeof(struct pgid));
435 else
436 /* Use existing pgid */
437 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
438 sizeof(struct pgid));
439}
440
1da177e4
LT		 441/*
442 * Function called from device_pgid.c after sense path ground has completed.
443 */
444void
445ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
446{
447 struct subchannel *sch;
448
449 sch = to_subchannel(cdev->dev.parent);
450 switch (err) {
7e560814
CH		 451 case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
452 cdev->private->options.pgroup = 0;
453 break;
454 case 0: /* success */
455 case -EACCES: /* partial success, some paths not operational */
456 /* Check if all pgids are equal or 0. */
457 __ccw_device_get_common_pgid(cdev);
1da177e4
LT		 458 break;
459 case -ETIME: /* Sense path group id stopped by timeout. */
460 case -EUSERS: /* device is reserved for someone else. */
461 ccw_device_done(cdev, DEV_STATE_BOXED);
7e560814 462 return;
1da177e4
LT		 463 default:
464 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
7e560814 465 return;
1da177e4 466 }
7e560814 467 /* Start Path Group verification. */
7e560814 468 cdev->private->state = DEV_STATE_VERIFY;
28bdc6f6 469 cdev->private->flags.doverify = 0;
7e560814 470 ccw_device_verify_start(cdev);
1da177e4
LT		 471}
472
473/*
474 * Start device recognition.
475 */
476int
477ccw_device_recognition(struct ccw_device *cdev)
478{
479 struct subchannel *sch;
480 int ret;
481
482 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
483 (cdev->private->state != DEV_STATE_BOXED))
484 return -EINVAL;
485 sch = to_subchannel(cdev->dev.parent);
486 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
487 if (ret != 0)
488 /* Couldn't enable the subchannel for i/o. Sick device. */
489 return ret;
490
491 /* After 60s the device recognition is considered to have failed. */
492 ccw_device_set_timeout(cdev, 60*HZ);
493
494 /*
495 * We used to start here with a sense pgid to find out whether a device
496 * is locked by someone else. Unfortunately, the sense pgid command
497 * code has other meanings on devices predating the path grouping
498 * algorithm, so we start with sense id and box the device after an
499 * timeout (or if sense pgid during path verification detects the device
500 * is locked, as may happen on newer devices).
501 */
502 cdev->private->flags.recog_done = 0;
503 cdev->private->state = DEV_STATE_SENSE_ID;
504 ccw_device_sense_id_start(cdev);
505 return 0;
506}
507
508/*
509 * Handle timeout in device recognition.
510 */
511static void
512ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
513{
514 int ret;
515
516 ret = ccw_device_cancel_halt_clear(cdev);
517 switch (ret) {
518 case 0:
519 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
520 break;
521 case -ENODEV:
522 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
523 break;
524 default:
525 ccw_device_set_timeout(cdev, 3*HZ);
526 }
527}
528
529
530static void
531ccw_device_nopath_notify(void *data)
532{
533 struct ccw_device *cdev;
534 struct subchannel *sch;
535 int ret;
536
12975aef 537 cdev = data;
1da177e4
LT		 538 sch = to_subchannel(cdev->dev.parent);
539 /* Extra sanity. */
540 if (sch->lpm)
541 return;
542 ret = (sch->driver && sch->driver->notify) ?
543 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
544 if (!ret) {
545 if (get_device(&sch->dev)) {
546 /* Driver doesn't want to keep device. */
547 cio_disable_subchannel(sch);
548 if (get_device(&cdev->dev)) {
549 PREPARE_WORK(&cdev->private->kick_work,
550 ccw_device_call_sch_unregister,
12975aef 551 cdev);
1da177e4
LT		 552 queue_work(ccw_device_work,
553 &cdev->private->kick_work);
554 } else
555 put_device(&sch->dev);
556 }
557 } else {
558 cio_disable_subchannel(sch);
559 ccw_device_set_timeout(cdev, 0);
560 cdev->private->flags.fake_irb = 0;
561 cdev->private->state = DEV_STATE_DISCONNECTED;
562 wake_up(&cdev->private->wait_q);
563 }
564}
565
566void
567ccw_device_verify_done(struct ccw_device *cdev, int err)
568{
28bdc6f6
PO		 569 struct subchannel *sch;
570
571 sch = to_subchannel(cdev->dev.parent);
572 /* Update schib - pom may have changed. */
573 stsch(sch->schid, &sch->schib);
574 /* Update lpm with verified path mask. */
575 sch->lpm = sch->vpm;
576 /* Repeat path verification? */
577 if (cdev->private->flags.doverify) {
578 cdev->private->flags.doverify = 0;
579 ccw_device_verify_start(cdev);
580 return;
581 }
1da177e4
LT		 582 switch (err) {
583 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
584 cdev->private->options.pgroup = 0;
585 case 0:
586 ccw_device_done(cdev, DEV_STATE_ONLINE);
587 /* Deliver fake irb to device driver, if needed. */
588 if (cdev->private->flags.fake_irb) {
589 memset(&cdev->private->irb, 0, sizeof(struct irb));
292888c8
HC		 590 cdev->private->irb.scsw.cc = 1;
591 cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
592 cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
593 cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
1da177e4
LT		 594 cdev->private->flags.fake_irb = 0;
595 if (cdev->handler)
596 cdev->handler(cdev, cdev->private->intparm,
597 &cdev->private->irb);
598 memset(&cdev->private->irb, 0, sizeof(struct irb));
599 }
600 break;
601 case -ETIME:
8b42f5c2
PO		 602 /* Reset oper notify indication after verify error. */
603 cdev->private->flags.donotify = 0;
1da177e4
LT		 604 ccw_device_done(cdev, DEV_STATE_BOXED);
605 break;
606 default:
8b42f5c2
PO		 607 /* Reset oper notify indication after verify error. */
608 cdev->private->flags.donotify = 0;
1da177e4 609 PREPARE_WORK(&cdev->private->kick_work,
12975aef 610 ccw_device_nopath_notify, cdev);
1da177e4
LT		 611 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
612 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
613 break;
614 }
615}
616
617/*
618 * Get device online.
619 */
620int
621ccw_device_online(struct ccw_device *cdev)
622{
623 struct subchannel *sch;
624 int ret;
625
626 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
627 (cdev->private->state != DEV_STATE_BOXED))
628 return -EINVAL;
629 sch = to_subchannel(cdev->dev.parent);
630 if (css_init_done && !get_device(&cdev->dev))
631 return -ENODEV;
632 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
633 if (ret != 0) {
634 /* Couldn't enable the subchannel for i/o. Sick device. */
635 if (ret == -ENODEV)
636 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
637 return ret;
638 }
639 /* Do we want to do path grouping? */
640 if (!cdev->private->options.pgroup) {
7e560814
CH		 641 /* Start initial path verification. */
642 cdev->private->state = DEV_STATE_VERIFY;
28bdc6f6 643 cdev->private->flags.doverify = 0;
7e560814 644 ccw_device_verify_start(cdev);
1da177e4
LT		 645 return 0;
646 }
647 /* Do a SensePGID first. */
648 cdev->private->state = DEV_STATE_SENSE_PGID;
649 ccw_device_sense_pgid_start(cdev);
650 return 0;
651}
652
653void
654ccw_device_disband_done(struct ccw_device *cdev, int err)
655{
656 switch (err) {
657 case 0:
658 ccw_device_done(cdev, DEV_STATE_OFFLINE);
659 break;
660 case -ETIME:
661 ccw_device_done(cdev, DEV_STATE_BOXED);
662 break;
663 default:
664 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
665 break;
666 }
667}
668
669/*
670 * Shutdown device.
671 */
672int
673ccw_device_offline(struct ccw_device *cdev)
674{
675 struct subchannel *sch;
676
677 sch = to_subchannel(cdev->dev.parent);
a8237fc4 678 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
1da177e4
LT		 679 return -ENODEV;
680 if (cdev->private->state != DEV_STATE_ONLINE) {
681 if (sch->schib.scsw.actl != 0)
682 return -EBUSY;
683 return -EINVAL;
684 }
685 if (sch->schib.scsw.actl != 0)
686 return -EBUSY;
687 /* Are we doing path grouping? */
688 if (!cdev->private->options.pgroup) {
689 /* No, set state offline immediately. */
690 ccw_device_done(cdev, DEV_STATE_OFFLINE);
691 return 0;
692 }
693 /* Start Set Path Group commands. */
694 cdev->private->state = DEV_STATE_DISBAND_PGID;
695 ccw_device_disband_start(cdev);
696 return 0;
697}
698
699/*
700 * Handle timeout in device online/offline process.
701 */
702static void
703ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
704{
705 int ret;
706
707 ret = ccw_device_cancel_halt_clear(cdev);
708 switch (ret) {
709 case 0:
710 ccw_device_done(cdev, DEV_STATE_BOXED);
711 break;
712 case -ENODEV:
713 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
714 break;
715 default:
716 ccw_device_set_timeout(cdev, 3*HZ);
717 }
718}
719
720/*
721 * Handle not oper event in device recognition.
722 */
723static void
724ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
725{
726 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
727}
728
729/*
730 * Handle not operational event while offline.
731 */
732static void
733ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
734{
735 struct subchannel *sch;
736
737 cdev->private->state = DEV_STATE_NOT_OPER;
738 sch = to_subchannel(cdev->dev.parent);
739 if (get_device(&cdev->dev)) {
740 PREPARE_WORK(&cdev->private->kick_work,
12975aef 741 ccw_device_call_sch_unregister, cdev);
1da177e4
LT		 742 queue_work(ccw_device_work, &cdev->private->kick_work);
743 }
744 wake_up(&cdev->private->wait_q);
745}
746
747/*
748 * Handle not operational event while online.
749 */
750static void
751ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
752{
753 struct subchannel *sch;
754
755 sch = to_subchannel(cdev->dev.parent);
756 if (sch->driver->notify &&
757 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
758 ccw_device_set_timeout(cdev, 0);
759 cdev->private->flags.fake_irb = 0;
760 cdev->private->state = DEV_STATE_DISCONNECTED;
761 wake_up(&cdev->private->wait_q);
762 return;
763 }
764 cdev->private->state = DEV_STATE_NOT_OPER;
765 cio_disable_subchannel(sch);
766 if (sch->schib.scsw.actl != 0) {
767 // FIXME: not-oper indication to device driver ?
768 ccw_device_call_handler(cdev);
769 }
770 if (get_device(&cdev->dev)) {
771 PREPARE_WORK(&cdev->private->kick_work,
12975aef 772 ccw_device_call_sch_unregister, cdev);
1da177e4
LT		 773 queue_work(ccw_device_work, &cdev->private->kick_work);
774 }
775 wake_up(&cdev->private->wait_q);
776}
777
778/*
779 * Handle path verification event.
780 */
781static void
782ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
783{
784 struct subchannel *sch;
785
1da177e4
LT		 786 if (cdev->private->state == DEV_STATE_W4SENSE) {
787 cdev->private->flags.doverify = 1;
788 return;
789 }
790 sch = to_subchannel(cdev->dev.parent);
791 /*
792 * Since we might not just be coming from an interrupt from the
793 * subchannel we have to update the schib.
794 */
a8237fc4 795 stsch(sch->schid, &sch->schib);
1da177e4
LT		 796
797 if (sch->schib.scsw.actl != 0 ||
65200c29 798 (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
1da177e4
LT		 799 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
800 /*
801 * No final status yet or final status not yet delivered
802 * to the device driver. Can't do path verfication now,
803 * delay until final status was delivered.
804 */
805 cdev->private->flags.doverify = 1;
806 return;
807 }
808 /* Device is idle, we can do the path verification. */
809 cdev->private->state = DEV_STATE_VERIFY;
28bdc6f6 810 cdev->private->flags.doverify = 0;
1da177e4
LT		 811 ccw_device_verify_start(cdev);
812}
813
814/*
815 * Got an interrupt for a normal io (state online).
816 */
817static void
818ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
819{
820 struct irb *irb;
821
822 irb = (struct irb *) __LC_IRB;
823 /* Check for unsolicited interrupt. */
824 if ((irb->scsw.stctl ==
825 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
826 && (!irb->scsw.cc)) {
827 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
828 !irb->esw.esw0.erw.cons) {
829 /* Unit check but no sense data. Need basic sense. */
830 if (ccw_device_do_sense(cdev, irb) != 0)
831 goto call_handler_unsol;
e0ec5749 832 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 833 cdev->private->state = DEV_STATE_W4SENSE;
834 cdev->private->intparm = 0;
835 return;
836 }
837call_handler_unsol:
838 if (cdev->handler)
839 cdev->handler (cdev, 0, irb);
840 return;
841 }
842 /* Accumulate status and find out if a basic sense is needed. */
843 ccw_device_accumulate_irb(cdev, irb);
844 if (cdev->private->flags.dosense) {
845 if (ccw_device_do_sense(cdev, irb) == 0) {
846 cdev->private->state = DEV_STATE_W4SENSE;
847 }
848 return;
849 }
850 /* Call the handler. */
851 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
852 /* Start delayed path verification. */
853 ccw_device_online_verify(cdev, 0);
854}
855
856/*
857 * Got an timeout in online state.
858 */
859static void
860ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
861{
862 int ret;
863
864 ccw_device_set_timeout(cdev, 0);
865 ret = ccw_device_cancel_halt_clear(cdev);
866 if (ret == -EBUSY) {
867 ccw_device_set_timeout(cdev, 3*HZ);
868 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
869 return;
870 }
871 if (ret == -ENODEV) {
872 struct subchannel *sch;
873
874 sch = to_subchannel(cdev->dev.parent);
875 if (!sch->lpm) {
876 PREPARE_WORK(&cdev->private->kick_work,
12975aef 877 ccw_device_nopath_notify, cdev);
1da177e4
LT		 878 queue_work(ccw_device_notify_work,
879 &cdev->private->kick_work);
880 } else
881 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
882 } else if (cdev->handler)
883 cdev->handler(cdev, cdev->private->intparm,
884 ERR_PTR(-ETIMEDOUT));
885}
886
887/*
888 * Got an interrupt for a basic sense.
889 */
890void
891ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
892{
893 struct irb *irb;
894
895 irb = (struct irb *) __LC_IRB;
896 /* Check for unsolicited interrupt. */
897 if (irb->scsw.stctl ==
898 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
899 if (irb->scsw.cc == 1)
900 /* Basic sense hasn't started. Try again. */
901 ccw_device_do_sense(cdev, irb);
902 else {
08983787
CH		 903 printk(KERN_INFO "Huh? %s(%s): unsolicited "
904 "interrupt...\n",
1da177e4
LT		 905 __FUNCTION__, cdev->dev.bus_id);
906 if (cdev->handler)
907 cdev->handler (cdev, 0, irb);
908 }
909 return;
910 }
3ba1998e
CH		 911 /*
912 * Check if a halt or clear has been issued in the meanwhile. If yes,
913 * only deliver the halt/clear interrupt to the device driver as if it
914 * had killed the original request.
915 */
916 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
d23861ff
CH		 917 /* Retry Basic Sense if requested. */
918 if (cdev->private->flags.intretry) {
919 cdev->private->flags.intretry = 0;
920 ccw_device_do_sense(cdev, irb);
921 return;
922 }
3ba1998e
CH		 923 cdev->private->flags.dosense = 0;
924 memset(&cdev->private->irb, 0, sizeof(struct irb));
925 ccw_device_accumulate_irb(cdev, irb);
926 goto call_handler;
927 }
1da177e4
LT		 928 /* Add basic sense info to irb. */
929 ccw_device_accumulate_basic_sense(cdev, irb);
930 if (cdev->private->flags.dosense) {
931 /* Another basic sense is needed. */
932 ccw_device_do_sense(cdev, irb);
933 return;
934 }
3ba1998e 935call_handler:
1da177e4
LT		 936 cdev->private->state = DEV_STATE_ONLINE;
937 /* Call the handler. */
938 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
939 /* Start delayed path verification. */
940 ccw_device_online_verify(cdev, 0);
941}
942
943static void
944ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
945{
946 struct irb *irb;
947
948 irb = (struct irb *) __LC_IRB;
949 /* Accumulate status. We don't do basic sense. */
950 ccw_device_accumulate_irb(cdev, irb);
b4f7b1ee
CH		 951 /* Remember to clear irb to avoid residuals. */
952 memset(&cdev->private->irb, 0, sizeof(struct irb));
1da177e4
LT		 953 /* Try to start delayed device verification. */
954 ccw_device_online_verify(cdev, 0);
955 /* Note: Don't call handler for cio initiated clear! */
956}
957
958static void
959ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
960{
961 struct subchannel *sch;
962
963 sch = to_subchannel(cdev->dev.parent);
964 ccw_device_set_timeout(cdev, 0);
965 /* OK, i/o is dead now. Call interrupt handler. */
966 cdev->private->state = DEV_STATE_ONLINE;
967 if (cdev->handler)
968 cdev->handler(cdev, cdev->private->intparm,
e7769b48 969 ERR_PTR(-EIO));
1da177e4
LT		 970 if (!sch->lpm) {
971 PREPARE_WORK(&cdev->private->kick_work,
12975aef 972 ccw_device_nopath_notify, cdev);
1da177e4
LT		 973 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
974 } else if (cdev->private->flags.doverify)
975 /* Start delayed path verification. */
976 ccw_device_online_verify(cdev, 0);
977}
978
979static void
980ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
981{
982 int ret;
983
984 ret = ccw_device_cancel_halt_clear(cdev);
985 if (ret == -EBUSY) {
986 ccw_device_set_timeout(cdev, 3*HZ);
987 return;
988 }
989 if (ret == -ENODEV) {
990 struct subchannel *sch;
991
992 sch = to_subchannel(cdev->dev.parent);
993 if (!sch->lpm) {
994 PREPARE_WORK(&cdev->private->kick_work,
12975aef 995 ccw_device_nopath_notify, cdev);
1da177e4
LT		 996 queue_work(ccw_device_notify_work,
997 &cdev->private->kick_work);
998 } else
999 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1000 return;
1001 }
1002 //FIXME: Can we get here?
1003 cdev->private->state = DEV_STATE_ONLINE;
1004 if (cdev->handler)
1005 cdev->handler(cdev, cdev->private->intparm,
e7769b48 1006 ERR_PTR(-EIO));
1da177e4
LT		 1007}
1008
e7769b48 1009void device_kill_io(struct subchannel *sch)
1da177e4
LT		 1010{
1011 int ret;
e7769b48 1012 struct ccw_device *cdev;
1da177e4 1013
e7769b48 1014 cdev = sch->dev.driver_data;
1da177e4
LT		 1015 ret = ccw_device_cancel_halt_clear(cdev);
1016 if (ret == -EBUSY) {
1017 ccw_device_set_timeout(cdev, 3*HZ);
1018 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1019 return;
1020 }
1021 if (ret == -ENODEV) {
1022 if (!sch->lpm) {
1023 PREPARE_WORK(&cdev->private->kick_work,
12975aef 1024 ccw_device_nopath_notify, cdev);
1da177e4
LT		 1025 queue_work(ccw_device_notify_work,
1026 &cdev->private->kick_work);
1027 } else
1028 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1029 return;
1030 }
1031 if (cdev->handler)
1032 cdev->handler(cdev, cdev->private->intparm,
e7769b48 1033 ERR_PTR(-EIO));
1da177e4
LT		 1034 if (!sch->lpm) {
1035 PREPARE_WORK(&cdev->private->kick_work,
12975aef 1036 ccw_device_nopath_notify, cdev);
1da177e4 1037 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
e7769b48 1038 } else
1da177e4
LT		 1039 /* Start delayed path verification. */
1040 ccw_device_online_verify(cdev, 0);
1041}
1042
1043static void
28bdc6f6 1044ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1da177e4 1045{
28bdc6f6 1046 /* Start verification after current task finished. */
7e560814 1047 cdev->private->flags.doverify = 1;
1da177e4
LT		 1048}
1049
1050static void
1051ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1052{
1053 struct irb *irb;
1054
1055 switch (dev_event) {
1056 case DEV_EVENT_INTERRUPT:
1057 irb = (struct irb *) __LC_IRB;
1058 /* Check for unsolicited interrupt. */
1059 if ((irb->scsw.stctl ==
1060 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1061 (!irb->scsw.cc))
1062 /* FIXME: we should restart stlck here, but this
1063 * is extremely unlikely ... */
1064 goto out_wakeup;
1065
1066 ccw_device_accumulate_irb(cdev, irb);
1067 /* We don't care about basic sense etc. */
1068 break;
1069 default: /* timeout */
1070 break;
1071 }
1072out_wakeup:
1073 wake_up(&cdev->private->wait_q);
1074}
1075
1076static void
1077ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1078{
1079 struct subchannel *sch;
1080
1081 sch = to_subchannel(cdev->dev.parent);
1082 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1083 /* Couldn't enable the subchannel for i/o. Sick device. */
1084 return;
1085
1086 /* After 60s the device recognition is considered to have failed. */
1087 ccw_device_set_timeout(cdev, 60*HZ);
1088
1089 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1090 ccw_device_sense_id_start(cdev);
1091}
1092
1093void
1094device_trigger_reprobe(struct subchannel *sch)
1095{
1096 struct ccw_device *cdev;
1097
1098 if (!sch->dev.driver_data)
1099 return;
1100 cdev = sch->dev.driver_data;
1101 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1102 return;
1103
1104 /* Update some values. */
a8237fc4 1105 if (stsch(sch->schid, &sch->schib))
1da177e4
LT		 1106 return;
1107
1108 /*
1109 * The pim, pam, pom values may not be accurate, but they are the best
1110 * we have before performing device selection :/
1111 */
28bdc6f6 1112 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1da177e4
LT		 1113 /* Re-set some bits in the pmcw that were lost. */
1114 sch->schib.pmcw.isc = 3;
1115 sch->schib.pmcw.csense = 1;
1116 sch->schib.pmcw.ena = 0;
1117 if ((sch->lpm & (sch->lpm - 1)) != 0)
1118 sch->schib.pmcw.mp = 1;
1119 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1120 /* We should also udate ssd info, but this has to wait. */
1121 ccw_device_start_id(cdev, 0);
1122}
1123
1124static void
1125ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1126{
1127 struct subchannel *sch;
1128
1129 sch = to_subchannel(cdev->dev.parent);
1130 /*
1131 * An interrupt in state offline means a previous disable was not
1132 * successful. Try again.
1133 */
1134 cio_disable_subchannel(sch);
1135}
1136
1137static void
1138ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1139{
1140 retry_set_schib(cdev);
1141 cdev->private->state = DEV_STATE_ONLINE;
1142 dev_fsm_event(cdev, dev_event);
1143}
1144
94bb0633
CH		 1145static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1146 enum dev_event dev_event)
1147{
1148 cmf_retry_copy_block(cdev);
1149 cdev->private->state = DEV_STATE_ONLINE;
1150 dev_fsm_event(cdev, dev_event);
1151}
1da177e4
LT		 1152
1153static void
1154ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1155{
1156 ccw_device_set_timeout(cdev, 0);
1157 if (dev_event == DEV_EVENT_NOTOPER)
1158 cdev->private->state = DEV_STATE_NOT_OPER;
1159 else
1160 cdev->private->state = DEV_STATE_OFFLINE;
1161 wake_up(&cdev->private->wait_q);
1162}
1163
1164static void
1165ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1166{
1167 int ret;
1168
1169 ret = ccw_device_cancel_halt_clear(cdev);
1170 switch (ret) {
1171 case 0:
1172 cdev->private->state = DEV_STATE_OFFLINE;
1173 wake_up(&cdev->private->wait_q);
1174 break;
1175 case -ENODEV:
1176 cdev->private->state = DEV_STATE_NOT_OPER;
1177 wake_up(&cdev->private->wait_q);
1178 break;
1179 default:
1180 ccw_device_set_timeout(cdev, HZ/10);
1181 }
1182}
1183
1184/*
1185 * No operation action. This is used e.g. to ignore a timeout event in
1186 * state offline.
1187 */
1188static void
1189ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1190{
1191}
1192
1193/*
1194 * Bug operation action.
1195 */
1196static void
1197ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1198{
1199 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1200 cdev->private->state, dev_event);
1201 BUG();
1202}
1203
1204/*
1205 * device statemachine
1206 */
1207fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1208 [DEV_STATE_NOT_OPER] = {
1209 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1210 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1211 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1212 [DEV_EVENT_VERIFY] = ccw_device_nop,
1213 },
1214 [DEV_STATE_SENSE_PGID] = {
1215 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1216 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1217 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1218 [DEV_EVENT_VERIFY] = ccw_device_nop,
1219 },
1220 [DEV_STATE_SENSE_ID] = {
1221 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1222 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1223 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1224 [DEV_EVENT_VERIFY] = ccw_device_nop,
1225 },
1226 [DEV_STATE_OFFLINE] = {
1227 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1228 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1229 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1230 [DEV_EVENT_VERIFY] = ccw_device_nop,
1231 },
1232 [DEV_STATE_VERIFY] = {
1233 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1234 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1235 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
28bdc6f6 1236 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1da177e4
LT		 1237 },
1238 [DEV_STATE_ONLINE] = {
1239 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1240 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1241 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1242 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1243 },
1244 [DEV_STATE_W4SENSE] = {
1245 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1246 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1247 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1248 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1249 },
1250 [DEV_STATE_DISBAND_PGID] = {
1251 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1252 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1253 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1254 [DEV_EVENT_VERIFY] = ccw_device_nop,
1255 },
1256 [DEV_STATE_BOXED] = {
1257 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1258 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1259 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1260 [DEV_EVENT_VERIFY] = ccw_device_nop,
1261 },
1262 /* states to wait for i/o completion before doing something */
1263 [DEV_STATE_CLEAR_VERIFY] = {
1264 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1265 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1266 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1267 [DEV_EVENT_VERIFY] = ccw_device_nop,
1268 },
1269 [DEV_STATE_TIMEOUT_KILL] = {
1270 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1271 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1272 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1273 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1274 },
1da177e4
LT		 1275 [DEV_STATE_QUIESCE] = {
1276 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1277 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1278 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1279 [DEV_EVENT_VERIFY] = ccw_device_nop,
1280 },
1281 /* special states for devices gone not operational */
1282 [DEV_STATE_DISCONNECTED] = {
1283 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1284 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1285 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
28bdc6f6 1286 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1da177e4
LT		 1287 },
1288 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1289 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1290 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1291 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1292 [DEV_EVENT_VERIFY] = ccw_device_nop,
1293 },
1294 [DEV_STATE_CMFCHANGE] = {
1295 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1296 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1297 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1298 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1299 },
94bb0633
CH		 1300 [DEV_STATE_CMFUPDATE] = {
1301 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1302 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1303 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1304 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1305 },
1da177e4
LT		 1306};
1307
1308/*
1309 * io_subchannel_irq is called for "real" interrupts or for status
1310 * pending conditions on msch.
1311 */
1312void
1313io_subchannel_irq (struct device *pdev)
1314{
1315 struct ccw_device *cdev;
1316
1317 cdev = to_subchannel(pdev)->dev.driver_data;
1318
1319 CIO_TRACE_EVENT (3, "IRQ");
1320 CIO_TRACE_EVENT (3, pdev->bus_id);
1321 if (cdev)
1322 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1323}
1324
1325EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
Linux kernel - Deliverables
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