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[S390] Avoid excessive inlining.
[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
d7b5a4c9 189 * de- and re-register.
1da177e4
LT		 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 ||
d7b5a4c9 194 cdev->id.dev_model != cdev->private->senseid.dev_model) {
1da177e4 195 PREPARE_WORK(&cdev->private->kick_work,
c1637532 196 ccw_device_do_unreg_rereg);
1da177e4
LT		 197 queue_work(ccw_device_work, &cdev->private->kick_work);
198 return 0;
199 }
200 cdev->private->flags.donotify = 1;
201 return 1;
202}
203
204/*
205 * The machine won't give us any notification by machine check if a chpid has
206 * been varied online on the SE so we have to find out by magic (i. e. driving
207 * the channel subsystem to device selection and updating our path masks).
208 */
4d284cac 209static void
1da177e4
LT		 210__recover_lost_chpids(struct subchannel *sch, int old_lpm)
211{
212 int mask, i;
213
214 for (i = 0; i<8; i++) {
215 mask = 0x80 >> i;
216 if (!(sch->lpm & mask))
217 continue;
218 if (old_lpm & mask)
219 continue;
220 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
221 }
222}
223
224/*
225 * Stop device recognition.
226 */
227static void
228ccw_device_recog_done(struct ccw_device *cdev, int state)
229{
230 struct subchannel *sch;
231 int notify, old_lpm, same_dev;
232
233 sch = to_subchannel(cdev->dev.parent);
234
235 ccw_device_set_timeout(cdev, 0);
236 cio_disable_subchannel(sch);
237 /*
238 * Now that we tried recognition, we have performed device selection
239 * through ssch() and the path information is up to date.
240 */
241 old_lpm = sch->lpm;
a8237fc4 242 stsch(sch->schid, &sch->schib);
28bdc6f6 243 sch->lpm = sch->schib.pmcw.pam & sch->opm;
4ffa9234
CH		 244 /* Check since device may again have become not operational. */
245 if (!sch->schib.pmcw.dnv)
246 state = DEV_STATE_NOT_OPER;
1da177e4
LT		 247 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
248 /* Force reprobe on all chpids. */
249 old_lpm = 0;
250 if (sch->lpm != old_lpm)
251 __recover_lost_chpids(sch, old_lpm);
252 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
253 if (state == DEV_STATE_NOT_OPER) {
254 cdev->private->flags.recog_done = 1;
255 cdev->private->state = DEV_STATE_DISCONNECTED;
256 return;
257 }
258 /* Boxed devices don't need extra treatment. */
259 }
260 notify = 0;
261 same_dev = 0; /* Keep the compiler quiet... */
262 switch (state) {
263 case DEV_STATE_NOT_OPER:
264 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5 265 "SenseID : unknown device %04x on subchannel "
78964268 266 "0.%x.%04x\n", cdev->private->dev_id.devno,
fb6958a5 267 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 268 break;
269 case DEV_STATE_OFFLINE:
270 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
271 same_dev = ccw_device_handle_oper(cdev);
272 notify = 1;
273 }
274 /* fill out sense information */
81388d2a 275 memset(&cdev->id, 0, sizeof(cdev->id));
292888c8
HC		 276 cdev->id.cu_type = cdev->private->senseid.cu_type;
277 cdev->id.cu_model = cdev->private->senseid.cu_model;
278 cdev->id.dev_type = cdev->private->senseid.dev_type;
279 cdev->id.dev_model = cdev->private->senseid.dev_model;
1da177e4
LT		 280 if (notify) {
281 cdev->private->state = DEV_STATE_OFFLINE;
282 if (same_dev) {
283 /* Get device online again. */
284 ccw_device_online(cdev);
285 wake_up(&cdev->private->wait_q);
286 }
287 return;
288 }
289 /* Issue device info message. */
fb6958a5 290 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
1da177e4 291 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
fb6958a5 292 "%04X/%02X\n",
78964268
CH		 293 cdev->private->dev_id.ssid,
294 cdev->private->dev_id.devno,
1da177e4
LT		 295 cdev->id.cu_type, cdev->id.cu_model,
296 cdev->id.dev_type, cdev->id.dev_model);
297 break;
298 case DEV_STATE_BOXED:
299 CIO_DEBUG(KERN_WARNING, 2,
fb6958a5 300 "SenseID : boxed device %04x on subchannel "
78964268 301 "0.%x.%04x\n", cdev->private->dev_id.devno,
fb6958a5 302 sch->schid.ssid, sch->schid.sch_no);
1da177e4
LT		 303 break;
304 }
305 cdev->private->state = state;
306 io_subchannel_recog_done(cdev);
307 if (state != DEV_STATE_NOT_OPER)
308 wake_up(&cdev->private->wait_q);
309}
310
311/*
312 * Function called from device_id.c after sense id has completed.
313 */
314void
315ccw_device_sense_id_done(struct ccw_device *cdev, int err)
316{
317 switch (err) {
318 case 0:
319 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
320 break;
321 case -ETIME: /* Sense id stopped by timeout. */
322 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
323 break;
324 default:
325 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
326 break;
327 }
328}
329
330static void
c1637532 331ccw_device_oper_notify(struct work_struct *work)
1da177e4 332{
c1637532 333 struct ccw_device_private *priv;
1da177e4
LT		 334 struct ccw_device *cdev;
335 struct subchannel *sch;
336 int ret;
337
c1637532
MS		 338 priv = container_of(work, struct ccw_device_private, kick_work);
339 cdev = priv->cdev;
1da177e4
LT		 340 sch = to_subchannel(cdev->dev.parent);
341 ret = (sch->driver && sch->driver->notify) ?
342 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
343 if (!ret)
344 /* Driver doesn't want device back. */
c1637532 345 ccw_device_do_unreg_rereg(work);
94bb0633
CH		 346 else {
347 /* Reenable channel measurements, if needed. */
348 cmf_reenable(cdev);
1da177e4 349 wake_up(&cdev->private->wait_q);
94bb0633 350 }
1da177e4
LT		 351}
352
353/*
354 * Finished with online/offline processing.
355 */
356static void
357ccw_device_done(struct ccw_device *cdev, int state)
358{
359 struct subchannel *sch;
360
361 sch = to_subchannel(cdev->dev.parent);
362
f1ee3281
CH		 363 ccw_device_set_timeout(cdev, 0);
364
1da177e4
LT		 365 if (state != DEV_STATE_ONLINE)
366 cio_disable_subchannel(sch);
367
368 /* Reset device status. */
369 memset(&cdev->private->irb, 0, sizeof(struct irb));
370
371 cdev->private->state = state;
372
373
374 if (state == DEV_STATE_BOXED)
375 CIO_DEBUG(KERN_WARNING, 2,
376 "Boxed device %04x on subchannel %04x\n",
78964268 377 cdev->private->dev_id.devno, sch->schid.sch_no);
1da177e4
LT		 378
379 if (cdev->private->flags.donotify) {
380 cdev->private->flags.donotify = 0;
c1637532 381 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
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
4d284cac 390static int cmp_pgid(struct pgid *p1, struct pgid *p2)
7e560814
CH		 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
c1637532 531ccw_device_nopath_notify(struct work_struct *work)
1da177e4 532{
c1637532 533 struct ccw_device_private *priv;
1da177e4
LT		 534 struct ccw_device *cdev;
535 struct subchannel *sch;
536 int ret;
537
c1637532
MS		 538 priv = container_of(work, struct ccw_device_private, kick_work);
539 cdev = priv->cdev;
1da177e4
LT		 540 sch = to_subchannel(cdev->dev.parent);
541 /* Extra sanity. */
542 if (sch->lpm)
543 return;
544 ret = (sch->driver && sch->driver->notify) ?
545 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
546 if (!ret) {
547 if (get_device(&sch->dev)) {
548 /* Driver doesn't want to keep device. */
549 cio_disable_subchannel(sch);
550 if (get_device(&cdev->dev)) {
551 PREPARE_WORK(&cdev->private->kick_work,
c1637532 552 ccw_device_call_sch_unregister);
1da177e4
LT		 553 queue_work(ccw_device_work,
554 &cdev->private->kick_work);
555 } else
556 put_device(&sch->dev);
557 }
558 } else {
559 cio_disable_subchannel(sch);
560 ccw_device_set_timeout(cdev, 0);
561 cdev->private->flags.fake_irb = 0;
562 cdev->private->state = DEV_STATE_DISCONNECTED;
563 wake_up(&cdev->private->wait_q);
564 }
565}
566
567void
568ccw_device_verify_done(struct ccw_device *cdev, int err)
569{
28bdc6f6
PO		 570 struct subchannel *sch;
571
572 sch = to_subchannel(cdev->dev.parent);
573 /* Update schib - pom may have changed. */
574 stsch(sch->schid, &sch->schib);
575 /* Update lpm with verified path mask. */
576 sch->lpm = sch->vpm;
577 /* Repeat path verification? */
578 if (cdev->private->flags.doverify) {
579 cdev->private->flags.doverify = 0;
580 ccw_device_verify_start(cdev);
581 return;
582 }
1da177e4
LT		 583 switch (err) {
584 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
585 cdev->private->options.pgroup = 0;
586 case 0:
587 ccw_device_done(cdev, DEV_STATE_ONLINE);
588 /* Deliver fake irb to device driver, if needed. */
589 if (cdev->private->flags.fake_irb) {
590 memset(&cdev->private->irb, 0, sizeof(struct irb));
292888c8
HC		 591 cdev->private->irb.scsw.cc = 1;
592 cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
593 cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
594 cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
1da177e4
LT		 595 cdev->private->flags.fake_irb = 0;
596 if (cdev->handler)
597 cdev->handler(cdev, cdev->private->intparm,
598 &cdev->private->irb);
599 memset(&cdev->private->irb, 0, sizeof(struct irb));
600 }
601 break;
602 case -ETIME:
8b42f5c2
PO		 603 /* Reset oper notify indication after verify error. */
604 cdev->private->flags.donotify = 0;
1da177e4
LT		 605 ccw_device_done(cdev, DEV_STATE_BOXED);
606 break;
607 default:
8b42f5c2
PO		 608 /* Reset oper notify indication after verify error. */
609 cdev->private->flags.donotify = 0;
1da177e4 610 PREPARE_WORK(&cdev->private->kick_work,
c1637532 611 ccw_device_nopath_notify);
1da177e4
LT		 612 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
613 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
614 break;
615 }
616}
617
618/*
619 * Get device online.
620 */
621int
622ccw_device_online(struct ccw_device *cdev)
623{
624 struct subchannel *sch;
625 int ret;
626
627 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
628 (cdev->private->state != DEV_STATE_BOXED))
629 return -EINVAL;
630 sch = to_subchannel(cdev->dev.parent);
631 if (css_init_done && !get_device(&cdev->dev))
632 return -ENODEV;
633 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
634 if (ret != 0) {
635 /* Couldn't enable the subchannel for i/o. Sick device. */
636 if (ret == -ENODEV)
637 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
638 return ret;
639 }
640 /* Do we want to do path grouping? */
641 if (!cdev->private->options.pgroup) {
7e560814
CH		 642 /* Start initial path verification. */
643 cdev->private->state = DEV_STATE_VERIFY;
28bdc6f6 644 cdev->private->flags.doverify = 0;
7e560814 645 ccw_device_verify_start(cdev);
1da177e4
LT		 646 return 0;
647 }
648 /* Do a SensePGID first. */
649 cdev->private->state = DEV_STATE_SENSE_PGID;
650 ccw_device_sense_pgid_start(cdev);
651 return 0;
652}
653
654void
655ccw_device_disband_done(struct ccw_device *cdev, int err)
656{
657 switch (err) {
658 case 0:
659 ccw_device_done(cdev, DEV_STATE_OFFLINE);
660 break;
661 case -ETIME:
662 ccw_device_done(cdev, DEV_STATE_BOXED);
663 break;
664 default:
665 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
666 break;
667 }
668}
669
670/*
671 * Shutdown device.
672 */
673int
674ccw_device_offline(struct ccw_device *cdev)
675{
676 struct subchannel *sch;
677
d7b5a4c9
CH		 678 if (ccw_device_is_orphan(cdev)) {
679 ccw_device_done(cdev, DEV_STATE_OFFLINE);
680 return 0;
681 }
1da177e4 682 sch = to_subchannel(cdev->dev.parent);
a8237fc4 683 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
1da177e4
LT		 684 return -ENODEV;
685 if (cdev->private->state != DEV_STATE_ONLINE) {
686 if (sch->schib.scsw.actl != 0)
687 return -EBUSY;
688 return -EINVAL;
689 }
690 if (sch->schib.scsw.actl != 0)
691 return -EBUSY;
692 /* Are we doing path grouping? */
693 if (!cdev->private->options.pgroup) {
694 /* No, set state offline immediately. */
695 ccw_device_done(cdev, DEV_STATE_OFFLINE);
696 return 0;
697 }
698 /* Start Set Path Group commands. */
699 cdev->private->state = DEV_STATE_DISBAND_PGID;
700 ccw_device_disband_start(cdev);
701 return 0;
702}
703
704/*
705 * Handle timeout in device online/offline process.
706 */
707static void
708ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
709{
710 int ret;
711
712 ret = ccw_device_cancel_halt_clear(cdev);
713 switch (ret) {
714 case 0:
715 ccw_device_done(cdev, DEV_STATE_BOXED);
716 break;
717 case -ENODEV:
718 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
719 break;
720 default:
721 ccw_device_set_timeout(cdev, 3*HZ);
722 }
723}
724
725/*
726 * Handle not oper event in device recognition.
727 */
728static void
729ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
730{
731 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
732}
733
734/*
735 * Handle not operational event while offline.
736 */
737static void
738ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
739{
740 struct subchannel *sch;
741
742 cdev->private->state = DEV_STATE_NOT_OPER;
743 sch = to_subchannel(cdev->dev.parent);
744 if (get_device(&cdev->dev)) {
745 PREPARE_WORK(&cdev->private->kick_work,
c1637532 746 ccw_device_call_sch_unregister);
1da177e4
LT		 747 queue_work(ccw_device_work, &cdev->private->kick_work);
748 }
749 wake_up(&cdev->private->wait_q);
750}
751
752/*
753 * Handle not operational event while online.
754 */
755static void
756ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
757{
758 struct subchannel *sch;
759
760 sch = to_subchannel(cdev->dev.parent);
761 if (sch->driver->notify &&
762 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
763 ccw_device_set_timeout(cdev, 0);
764 cdev->private->flags.fake_irb = 0;
765 cdev->private->state = DEV_STATE_DISCONNECTED;
766 wake_up(&cdev->private->wait_q);
767 return;
768 }
769 cdev->private->state = DEV_STATE_NOT_OPER;
770 cio_disable_subchannel(sch);
771 if (sch->schib.scsw.actl != 0) {
772 // FIXME: not-oper indication to device driver ?
773 ccw_device_call_handler(cdev);
774 }
775 if (get_device(&cdev->dev)) {
776 PREPARE_WORK(&cdev->private->kick_work,
c1637532 777 ccw_device_call_sch_unregister);
1da177e4
LT		 778 queue_work(ccw_device_work, &cdev->private->kick_work);
779 }
780 wake_up(&cdev->private->wait_q);
781}
782
783/*
784 * Handle path verification event.
785 */
786static void
787ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
788{
789 struct subchannel *sch;
790
1da177e4
LT		 791 if (cdev->private->state == DEV_STATE_W4SENSE) {
792 cdev->private->flags.doverify = 1;
793 return;
794 }
795 sch = to_subchannel(cdev->dev.parent);
796 /*
797 * Since we might not just be coming from an interrupt from the
798 * subchannel we have to update the schib.
799 */
a8237fc4 800 stsch(sch->schid, &sch->schib);
1da177e4
LT		 801
802 if (sch->schib.scsw.actl != 0 ||
65200c29 803 (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
1da177e4
LT		 804 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
805 /*
806 * No final status yet or final status not yet delivered
807 * to the device driver. Can't do path verfication now,
808 * delay until final status was delivered.
809 */
810 cdev->private->flags.doverify = 1;
811 return;
812 }
813 /* Device is idle, we can do the path verification. */
814 cdev->private->state = DEV_STATE_VERIFY;
28bdc6f6 815 cdev->private->flags.doverify = 0;
1da177e4
LT		 816 ccw_device_verify_start(cdev);
817}
818
819/*
820 * Got an interrupt for a normal io (state online).
821 */
822static void
823ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
824{
825 struct irb *irb;
826
827 irb = (struct irb *) __LC_IRB;
828 /* Check for unsolicited interrupt. */
829 if ((irb->scsw.stctl ==
830 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
831 && (!irb->scsw.cc)) {
832 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
833 !irb->esw.esw0.erw.cons) {
834 /* Unit check but no sense data. Need basic sense. */
835 if (ccw_device_do_sense(cdev, irb) != 0)
836 goto call_handler_unsol;
e0ec5749 837 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 838 cdev->private->state = DEV_STATE_W4SENSE;
839 cdev->private->intparm = 0;
840 return;
841 }
842call_handler_unsol:
843 if (cdev->handler)
844 cdev->handler (cdev, 0, irb);
18374d37
CH		 845 if (cdev->private->flags.doverify)
846 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 847 return;
848 }
849 /* Accumulate status and find out if a basic sense is needed. */
850 ccw_device_accumulate_irb(cdev, irb);
851 if (cdev->private->flags.dosense) {
852 if (ccw_device_do_sense(cdev, irb) == 0) {
853 cdev->private->state = DEV_STATE_W4SENSE;
854 }
855 return;
856 }
857 /* Call the handler. */
858 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
859 /* Start delayed path verification. */
860 ccw_device_online_verify(cdev, 0);
861}
862
863/*
864 * Got an timeout in online state.
865 */
866static void
867ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
868{
869 int ret;
870
871 ccw_device_set_timeout(cdev, 0);
872 ret = ccw_device_cancel_halt_clear(cdev);
873 if (ret == -EBUSY) {
874 ccw_device_set_timeout(cdev, 3*HZ);
875 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
876 return;
877 }
878 if (ret == -ENODEV) {
879 struct subchannel *sch;
880
881 sch = to_subchannel(cdev->dev.parent);
882 if (!sch->lpm) {
883 PREPARE_WORK(&cdev->private->kick_work,
c1637532 884 ccw_device_nopath_notify);
1da177e4
LT		 885 queue_work(ccw_device_notify_work,
886 &cdev->private->kick_work);
887 } else
888 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
889 } else if (cdev->handler)
890 cdev->handler(cdev, cdev->private->intparm,
891 ERR_PTR(-ETIMEDOUT));
892}
893
894/*
895 * Got an interrupt for a basic sense.
896 */
2b67fc46 897static void
1da177e4
LT		 898ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
899{
900 struct irb *irb;
901
902 irb = (struct irb *) __LC_IRB;
903 /* Check for unsolicited interrupt. */
904 if (irb->scsw.stctl ==
905 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
906 if (irb->scsw.cc == 1)
907 /* Basic sense hasn't started. Try again. */
908 ccw_device_do_sense(cdev, irb);
909 else {
08983787
CH		 910 printk(KERN_INFO "Huh? %s(%s): unsolicited "
911 "interrupt...\n",
1da177e4
LT		 912 __FUNCTION__, cdev->dev.bus_id);
913 if (cdev->handler)
914 cdev->handler (cdev, 0, irb);
915 }
916 return;
917 }
3ba1998e
CH		 918 /*
919 * Check if a halt or clear has been issued in the meanwhile. If yes,
920 * only deliver the halt/clear interrupt to the device driver as if it
921 * had killed the original request.
922 */
923 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
d23861ff
CH		 924 /* Retry Basic Sense if requested. */
925 if (cdev->private->flags.intretry) {
926 cdev->private->flags.intretry = 0;
927 ccw_device_do_sense(cdev, irb);
928 return;
929 }
3ba1998e
CH		 930 cdev->private->flags.dosense = 0;
931 memset(&cdev->private->irb, 0, sizeof(struct irb));
932 ccw_device_accumulate_irb(cdev, irb);
933 goto call_handler;
934 }
1da177e4
LT		 935 /* Add basic sense info to irb. */
936 ccw_device_accumulate_basic_sense(cdev, irb);
937 if (cdev->private->flags.dosense) {
938 /* Another basic sense is needed. */
939 ccw_device_do_sense(cdev, irb);
940 return;
941 }
3ba1998e 942call_handler:
1da177e4
LT		 943 cdev->private->state = DEV_STATE_ONLINE;
944 /* Call the handler. */
945 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
946 /* Start delayed path verification. */
947 ccw_device_online_verify(cdev, 0);
948}
949
950static void
951ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
952{
953 struct irb *irb;
954
955 irb = (struct irb *) __LC_IRB;
956 /* Accumulate status. We don't do basic sense. */
957 ccw_device_accumulate_irb(cdev, irb);
b4f7b1ee
CH		 958 /* Remember to clear irb to avoid residuals. */
959 memset(&cdev->private->irb, 0, sizeof(struct irb));
1da177e4
LT		 960 /* Try to start delayed device verification. */
961 ccw_device_online_verify(cdev, 0);
962 /* Note: Don't call handler for cio initiated clear! */
963}
964
965static void
966ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
967{
968 struct subchannel *sch;
969
970 sch = to_subchannel(cdev->dev.parent);
971 ccw_device_set_timeout(cdev, 0);
972 /* OK, i/o is dead now. Call interrupt handler. */
973 cdev->private->state = DEV_STATE_ONLINE;
974 if (cdev->handler)
975 cdev->handler(cdev, cdev->private->intparm,
e7769b48 976 ERR_PTR(-EIO));
1da177e4
LT		 977 if (!sch->lpm) {
978 PREPARE_WORK(&cdev->private->kick_work,
c1637532 979 ccw_device_nopath_notify);
1da177e4
LT		 980 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
981 } else if (cdev->private->flags.doverify)
982 /* Start delayed path verification. */
983 ccw_device_online_verify(cdev, 0);
984}
985
986static void
987ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
988{
989 int ret;
990
991 ret = ccw_device_cancel_halt_clear(cdev);
992 if (ret == -EBUSY) {
993 ccw_device_set_timeout(cdev, 3*HZ);
994 return;
995 }
996 if (ret == -ENODEV) {
997 struct subchannel *sch;
998
999 sch = to_subchannel(cdev->dev.parent);
1000 if (!sch->lpm) {
1001 PREPARE_WORK(&cdev->private->kick_work,
c1637532 1002 ccw_device_nopath_notify);
1da177e4
LT		 1003 queue_work(ccw_device_notify_work,
1004 &cdev->private->kick_work);
1005 } else
1006 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1007 return;
1008 }
1009 //FIXME: Can we get here?
1010 cdev->private->state = DEV_STATE_ONLINE;
1011 if (cdev->handler)
1012 cdev->handler(cdev, cdev->private->intparm,
e7769b48 1013 ERR_PTR(-EIO));
1da177e4
LT		 1014}
1015
e7769b48 1016void device_kill_io(struct subchannel *sch)
1da177e4
LT		 1017{
1018 int ret;
e7769b48 1019 struct ccw_device *cdev;
1da177e4 1020
e7769b48 1021 cdev = sch->dev.driver_data;
1da177e4
LT		 1022 ret = ccw_device_cancel_halt_clear(cdev);
1023 if (ret == -EBUSY) {
1024 ccw_device_set_timeout(cdev, 3*HZ);
1025 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1026 return;
1027 }
1028 if (ret == -ENODEV) {
1029 if (!sch->lpm) {
1030 PREPARE_WORK(&cdev->private->kick_work,
c1637532 1031 ccw_device_nopath_notify);
1da177e4
LT		 1032 queue_work(ccw_device_notify_work,
1033 &cdev->private->kick_work);
1034 } else
1035 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1036 return;
1037 }
1038 if (cdev->handler)
1039 cdev->handler(cdev, cdev->private->intparm,
e7769b48 1040 ERR_PTR(-EIO));
1da177e4
LT		 1041 if (!sch->lpm) {
1042 PREPARE_WORK(&cdev->private->kick_work,
c1637532 1043 ccw_device_nopath_notify);
1da177e4 1044 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
e7769b48 1045 } else
1da177e4
LT		 1046 /* Start delayed path verification. */
1047 ccw_device_online_verify(cdev, 0);
1048}
1049
1050static void
28bdc6f6 1051ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1da177e4 1052{
28bdc6f6 1053 /* Start verification after current task finished. */
7e560814 1054 cdev->private->flags.doverify = 1;
1da177e4
LT		 1055}
1056
1057static void
1058ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1059{
1060 struct irb *irb;
1061
1062 switch (dev_event) {
1063 case DEV_EVENT_INTERRUPT:
1064 irb = (struct irb *) __LC_IRB;
1065 /* Check for unsolicited interrupt. */
1066 if ((irb->scsw.stctl ==
1067 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1068 (!irb->scsw.cc))
1069 /* FIXME: we should restart stlck here, but this
1070 * is extremely unlikely ... */
1071 goto out_wakeup;
1072
1073 ccw_device_accumulate_irb(cdev, irb);
1074 /* We don't care about basic sense etc. */
1075 break;
1076 default: /* timeout */
1077 break;
1078 }
1079out_wakeup:
1080 wake_up(&cdev->private->wait_q);
1081}
1082
1083static void
1084ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1085{
1086 struct subchannel *sch;
1087
1088 sch = to_subchannel(cdev->dev.parent);
1089 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1090 /* Couldn't enable the subchannel for i/o. Sick device. */
1091 return;
1092
1093 /* After 60s the device recognition is considered to have failed. */
1094 ccw_device_set_timeout(cdev, 60*HZ);
1095
1096 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1097 ccw_device_sense_id_start(cdev);
1098}
1099
1100void
1101device_trigger_reprobe(struct subchannel *sch)
1102{
1103 struct ccw_device *cdev;
1104
1105 if (!sch->dev.driver_data)
1106 return;
1107 cdev = sch->dev.driver_data;
1108 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1109 return;
1110
1111 /* Update some values. */
a8237fc4 1112 if (stsch(sch->schid, &sch->schib))
1da177e4 1113 return;
7674da77
CH		 1114 if (!sch->schib.pmcw.dnv)
1115 return;
1da177e4
LT		 1116 /*
1117 * The pim, pam, pom values may not be accurate, but they are the best
1118 * we have before performing device selection :/
1119 */
28bdc6f6 1120 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1da177e4
LT		 1121 /* Re-set some bits in the pmcw that were lost. */
1122 sch->schib.pmcw.isc = 3;
1123 sch->schib.pmcw.csense = 1;
1124 sch->schib.pmcw.ena = 0;
1125 if ((sch->lpm & (sch->lpm - 1)) != 0)
1126 sch->schib.pmcw.mp = 1;
1127 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1128 /* We should also udate ssd info, but this has to wait. */
d7b5a4c9
CH		 1129 /* Check if this is another device which appeared on the same sch. */
1130 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1131 PREPARE_WORK(&cdev->private->kick_work,
1132 ccw_device_move_to_orphanage);
1133 queue_work(ccw_device_work, &cdev->private->kick_work);
1134 } else
1135 ccw_device_start_id(cdev, 0);
1da177e4
LT		 1136}
1137
1138static void
1139ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1140{
1141 struct subchannel *sch;
1142
1143 sch = to_subchannel(cdev->dev.parent);
1144 /*
1145 * An interrupt in state offline means a previous disable was not
1146 * successful. Try again.
1147 */
1148 cio_disable_subchannel(sch);
1149}
1150
1151static void
1152ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1153{
1154 retry_set_schib(cdev);
1155 cdev->private->state = DEV_STATE_ONLINE;
1156 dev_fsm_event(cdev, dev_event);
1157}
1158
94bb0633
CH		 1159static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1160 enum dev_event dev_event)
1161{
1162 cmf_retry_copy_block(cdev);
1163 cdev->private->state = DEV_STATE_ONLINE;
1164 dev_fsm_event(cdev, dev_event);
1165}
1da177e4
LT		 1166
1167static void
1168ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1169{
1170 ccw_device_set_timeout(cdev, 0);
1171 if (dev_event == DEV_EVENT_NOTOPER)
1172 cdev->private->state = DEV_STATE_NOT_OPER;
1173 else
1174 cdev->private->state = DEV_STATE_OFFLINE;
1175 wake_up(&cdev->private->wait_q);
1176}
1177
1178static void
1179ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1180{
1181 int ret;
1182
1183 ret = ccw_device_cancel_halt_clear(cdev);
1184 switch (ret) {
1185 case 0:
1186 cdev->private->state = DEV_STATE_OFFLINE;
1187 wake_up(&cdev->private->wait_q);
1188 break;
1189 case -ENODEV:
1190 cdev->private->state = DEV_STATE_NOT_OPER;
1191 wake_up(&cdev->private->wait_q);
1192 break;
1193 default:
1194 ccw_device_set_timeout(cdev, HZ/10);
1195 }
1196}
1197
1198/*
1199 * No operation action. This is used e.g. to ignore a timeout event in
1200 * state offline.
1201 */
1202static void
1203ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1204{
1205}
1206
1207/*
1208 * Bug operation action.
1209 */
1210static void
1211ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1212{
1213 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1214 cdev->private->state, dev_event);
1215 BUG();
1216}
1217
1218/*
1219 * device statemachine
1220 */
1221fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1222 [DEV_STATE_NOT_OPER] = {
1223 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1224 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1225 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1226 [DEV_EVENT_VERIFY] = ccw_device_nop,
1227 },
1228 [DEV_STATE_SENSE_PGID] = {
1229 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1230 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1231 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1232 [DEV_EVENT_VERIFY] = ccw_device_nop,
1233 },
1234 [DEV_STATE_SENSE_ID] = {
1235 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1236 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1237 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1238 [DEV_EVENT_VERIFY] = ccw_device_nop,
1239 },
1240 [DEV_STATE_OFFLINE] = {
1241 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1242 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1243 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1244 [DEV_EVENT_VERIFY] = ccw_device_nop,
1245 },
1246 [DEV_STATE_VERIFY] = {
1247 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1248 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1249 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
28bdc6f6 1250 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1da177e4
LT		 1251 },
1252 [DEV_STATE_ONLINE] = {
1253 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1254 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1255 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1256 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1257 },
1258 [DEV_STATE_W4SENSE] = {
1259 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1260 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1261 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1262 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1263 },
1264 [DEV_STATE_DISBAND_PGID] = {
1265 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1266 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1267 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1268 [DEV_EVENT_VERIFY] = ccw_device_nop,
1269 },
1270 [DEV_STATE_BOXED] = {
1271 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1272 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1273 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1274 [DEV_EVENT_VERIFY] = ccw_device_nop,
1275 },
1276 /* states to wait for i/o completion before doing something */
1277 [DEV_STATE_CLEAR_VERIFY] = {
1278 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1279 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1280 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1281 [DEV_EVENT_VERIFY] = ccw_device_nop,
1282 },
1283 [DEV_STATE_TIMEOUT_KILL] = {
1284 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1285 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1286 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1287 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1288 },
1da177e4
LT		 1289 [DEV_STATE_QUIESCE] = {
1290 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1291 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1292 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1293 [DEV_EVENT_VERIFY] = ccw_device_nop,
1294 },
1295 /* special states for devices gone not operational */
1296 [DEV_STATE_DISCONNECTED] = {
1297 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1298 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1299 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
28bdc6f6 1300 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1da177e4
LT		 1301 },
1302 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1303 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1304 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1305 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1306 [DEV_EVENT_VERIFY] = ccw_device_nop,
1307 },
1308 [DEV_STATE_CMFCHANGE] = {
1309 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1310 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1311 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1312 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1313 },
94bb0633
CH		 1314 [DEV_STATE_CMFUPDATE] = {
1315 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1316 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1317 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1318 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1319 },
1da177e4
LT		 1320};
1321
1322/*
1323 * io_subchannel_irq is called for "real" interrupts or for status
1324 * pending conditions on msch.
1325 */
1326void
1327io_subchannel_irq (struct device *pdev)
1328{
1329 struct ccw_device *cdev;
1330
1331 cdev = to_subchannel(pdev)->dev.driver_data;
1332
1333 CIO_TRACE_EVENT (3, "IRQ");
1334 CIO_TRACE_EVENT (3, pdev->bus_id);
1335 if (cdev)
1336 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1337}
1338
1339EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
Linux kernel - Deliverables
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