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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/cio/device_fsm.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/s390/cio/device_fsm.c')
-rw-r--r--drivers/s390/cio/device_fsm.c1250
1 files changed, 1250 insertions, 0 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
new file mode 100644
index 000000000000..9b7f6f548b1d
--- /dev/null
+++ b/drivers/s390/cio/device_fsm.c
@@ -0,0 +1,1250 @@
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
7 * Author(s): Cornelia Huck(cohuck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 */
10
11#include <linux/module.h>
12#include <linux/config.h>
13#include <linux/init.h>
14
15#include <asm/ccwdev.h>
16#include <asm/qdio.h>
17
18#include "cio.h"
19#include "cio_debug.h"
20#include "css.h"
21#include "device.h"
22#include "chsc.h"
23#include "ioasm.h"
24#include "qdio.h"
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);
135 ret = stsch(sch->irq, &sch->schib);
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;
233 stsch(sch->irq, &sch->schib);
234 sch->lpm = sch->schib.pmcw.pim &
235 sch->schib.pmcw.pam &
236 sch->schib.pmcw.pom &
237 sch->opm;
238 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
239 /* Force reprobe on all chpids. */
240 old_lpm = 0;
241 if (sch->lpm != old_lpm)
242 __recover_lost_chpids(sch, old_lpm);
243 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
244 if (state == DEV_STATE_NOT_OPER) {
245 cdev->private->flags.recog_done = 1;
246 cdev->private->state = DEV_STATE_DISCONNECTED;
247 return;
248 }
249 /* Boxed devices don't need extra treatment. */
250 }
251 notify = 0;
252 same_dev = 0; /* Keep the compiler quiet... */
253 switch (state) {
254 case DEV_STATE_NOT_OPER:
255 CIO_DEBUG(KERN_WARNING, 2,
256 "SenseID : unknown device %04x on subchannel %04x\n",
257 cdev->private->devno, sch->irq);
258 break;
259 case DEV_STATE_OFFLINE:
260 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
261 same_dev = ccw_device_handle_oper(cdev);
262 notify = 1;
263 }
264 /* fill out sense information */
265 cdev->id = (struct ccw_device_id) {
266 .cu_type = cdev->private->senseid.cu_type,
267 .cu_model = cdev->private->senseid.cu_model,
268 .dev_type = cdev->private->senseid.dev_type,
269 .dev_model = cdev->private->senseid.dev_model,
270 };
271 if (notify) {
272 cdev->private->state = DEV_STATE_OFFLINE;
273 if (same_dev) {
274 /* Get device online again. */
275 ccw_device_online(cdev);
276 wake_up(&cdev->private->wait_q);
277 }
278 return;
279 }
280 /* Issue device info message. */
281 CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
282 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
283 "%04X/%02X\n", cdev->private->devno,
284 cdev->id.cu_type, cdev->id.cu_model,
285 cdev->id.dev_type, cdev->id.dev_model);
286 break;
287 case DEV_STATE_BOXED:
288 CIO_DEBUG(KERN_WARNING, 2,
289 "SenseID : boxed device %04x on subchannel %04x\n",
290 cdev->private->devno, sch->irq);
291 break;
292 }
293 cdev->private->state = state;
294 io_subchannel_recog_done(cdev);
295 if (state != DEV_STATE_NOT_OPER)
296 wake_up(&cdev->private->wait_q);
297}
298
299/*
300 * Function called from device_id.c after sense id has completed.
301 */
302void
303ccw_device_sense_id_done(struct ccw_device *cdev, int err)
304{
305 switch (err) {
306 case 0:
307 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
308 break;
309 case -ETIME: /* Sense id stopped by timeout. */
310 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
311 break;
312 default:
313 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
314 break;
315 }
316}
317
318static void
319ccw_device_oper_notify(void *data)
320{
321 struct ccw_device *cdev;
322 struct subchannel *sch;
323 int ret;
324
325 cdev = (struct ccw_device *)data;
326 sch = to_subchannel(cdev->dev.parent);
327 ret = (sch->driver && sch->driver->notify) ?
328 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
329 if (!ret)
330 /* Driver doesn't want device back. */
331 ccw_device_do_unreg_rereg((void *)cdev);
332 else
333 wake_up(&cdev->private->wait_q);
334}
335
336/*
337 * Finished with online/offline processing.
338 */
339static void
340ccw_device_done(struct ccw_device *cdev, int state)
341{
342 struct subchannel *sch;
343
344 sch = to_subchannel(cdev->dev.parent);
345
346 if (state != DEV_STATE_ONLINE)
347 cio_disable_subchannel(sch);
348
349 /* Reset device status. */
350 memset(&cdev->private->irb, 0, sizeof(struct irb));
351
352 cdev->private->state = state;
353
354
355 if (state == DEV_STATE_BOXED)
356 CIO_DEBUG(KERN_WARNING, 2,
357 "Boxed device %04x on subchannel %04x\n",
358 cdev->private->devno, sch->irq);
359
360 if (cdev->private->flags.donotify) {
361 cdev->private->flags.donotify = 0;
362 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
363 (void *)cdev);
364 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
365 }
366 wake_up(&cdev->private->wait_q);
367
368 if (css_init_done && state != DEV_STATE_ONLINE)
369 put_device (&cdev->dev);
370}
371
372/*
373 * Function called from device_pgid.c after sense path ground has completed.
374 */
375void
376ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
377{
378 struct subchannel *sch;
379
380 sch = to_subchannel(cdev->dev.parent);
381 switch (err) {
382 case 0:
383 /* Start Path Group verification. */
384 sch->vpm = 0; /* Start with no path groups set. */
385 cdev->private->state = DEV_STATE_VERIFY;
386 ccw_device_verify_start(cdev);
387 break;
388 case -ETIME: /* Sense path group id stopped by timeout. */
389 case -EUSERS: /* device is reserved for someone else. */
390 ccw_device_done(cdev, DEV_STATE_BOXED);
391 break;
392 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
393 cdev->private->options.pgroup = 0;
394 ccw_device_done(cdev, DEV_STATE_ONLINE);
395 break;
396 default:
397 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
398 break;
399 }
400}
401
402/*
403 * Start device recognition.
404 */
405int
406ccw_device_recognition(struct ccw_device *cdev)
407{
408 struct subchannel *sch;
409 int ret;
410
411 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
412 (cdev->private->state != DEV_STATE_BOXED))
413 return -EINVAL;
414 sch = to_subchannel(cdev->dev.parent);
415 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
416 if (ret != 0)
417 /* Couldn't enable the subchannel for i/o. Sick device. */
418 return ret;
419
420 /* After 60s the device recognition is considered to have failed. */
421 ccw_device_set_timeout(cdev, 60*HZ);
422
423 /*
424 * We used to start here with a sense pgid to find out whether a device
425 * is locked by someone else. Unfortunately, the sense pgid command
426 * code has other meanings on devices predating the path grouping
427 * algorithm, so we start with sense id and box the device after an
428 * timeout (or if sense pgid during path verification detects the device
429 * is locked, as may happen on newer devices).
430 */
431 cdev->private->flags.recog_done = 0;
432 cdev->private->state = DEV_STATE_SENSE_ID;
433 ccw_device_sense_id_start(cdev);
434 return 0;
435}
436
437/*
438 * Handle timeout in device recognition.
439 */
440static void
441ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
442{
443 int ret;
444
445 ret = ccw_device_cancel_halt_clear(cdev);
446 switch (ret) {
447 case 0:
448 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
449 break;
450 case -ENODEV:
451 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
452 break;
453 default:
454 ccw_device_set_timeout(cdev, 3*HZ);
455 }
456}
457
458
459static void
460ccw_device_nopath_notify(void *data)
461{
462 struct ccw_device *cdev;
463 struct subchannel *sch;
464 int ret;
465
466 cdev = (struct ccw_device *)data;
467 sch = to_subchannel(cdev->dev.parent);
468 /* Extra sanity. */
469 if (sch->lpm)
470 return;
471 ret = (sch->driver && sch->driver->notify) ?
472 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
473 if (!ret) {
474 if (get_device(&sch->dev)) {
475 /* Driver doesn't want to keep device. */
476 cio_disable_subchannel(sch);
477 if (get_device(&cdev->dev)) {
478 PREPARE_WORK(&cdev->private->kick_work,
479 ccw_device_call_sch_unregister,
480 (void *)cdev);
481 queue_work(ccw_device_work,
482 &cdev->private->kick_work);
483 } else
484 put_device(&sch->dev);
485 }
486 } else {
487 cio_disable_subchannel(sch);
488 ccw_device_set_timeout(cdev, 0);
489 cdev->private->flags.fake_irb = 0;
490 cdev->private->state = DEV_STATE_DISCONNECTED;
491 wake_up(&cdev->private->wait_q);
492 }
493}
494
495void
496ccw_device_verify_done(struct ccw_device *cdev, int err)
497{
498 cdev->private->flags.doverify = 0;
499 switch (err) {
500 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
501 cdev->private->options.pgroup = 0;
502 case 0:
503 ccw_device_done(cdev, DEV_STATE_ONLINE);
504 /* Deliver fake irb to device driver, if needed. */
505 if (cdev->private->flags.fake_irb) {
506 memset(&cdev->private->irb, 0, sizeof(struct irb));
507 cdev->private->irb.scsw = (struct scsw) {
508 .cc = 1,
509 .fctl = SCSW_FCTL_START_FUNC,
510 .actl = SCSW_ACTL_START_PEND,
511 .stctl = SCSW_STCTL_STATUS_PEND,
512 };
513 cdev->private->flags.fake_irb = 0;
514 if (cdev->handler)
515 cdev->handler(cdev, cdev->private->intparm,
516 &cdev->private->irb);
517 memset(&cdev->private->irb, 0, sizeof(struct irb));
518 }
519 break;
520 case -ETIME:
521 ccw_device_done(cdev, DEV_STATE_BOXED);
522 break;
523 default:
524 PREPARE_WORK(&cdev->private->kick_work,
525 ccw_device_nopath_notify, (void *)cdev);
526 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
527 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
528 break;
529 }
530}
531
532/*
533 * Get device online.
534 */
535int
536ccw_device_online(struct ccw_device *cdev)
537{
538 struct subchannel *sch;
539 int ret;
540
541 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
542 (cdev->private->state != DEV_STATE_BOXED))
543 return -EINVAL;
544 sch = to_subchannel(cdev->dev.parent);
545 if (css_init_done && !get_device(&cdev->dev))
546 return -ENODEV;
547 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
548 if (ret != 0) {
549 /* Couldn't enable the subchannel for i/o. Sick device. */
550 if (ret == -ENODEV)
551 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
552 return ret;
553 }
554 /* Do we want to do path grouping? */
555 if (!cdev->private->options.pgroup) {
556 /* No, set state online immediately. */
557 ccw_device_done(cdev, DEV_STATE_ONLINE);
558 return 0;
559 }
560 /* Do a SensePGID first. */
561 cdev->private->state = DEV_STATE_SENSE_PGID;
562 ccw_device_sense_pgid_start(cdev);
563 return 0;
564}
565
566void
567ccw_device_disband_done(struct ccw_device *cdev, int err)
568{
569 switch (err) {
570 case 0:
571 ccw_device_done(cdev, DEV_STATE_OFFLINE);
572 break;
573 case -ETIME:
574 ccw_device_done(cdev, DEV_STATE_BOXED);
575 break;
576 default:
577 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
578 break;
579 }
580}
581
582/*
583 * Shutdown device.
584 */
585int
586ccw_device_offline(struct ccw_device *cdev)
587{
588 struct subchannel *sch;
589
590 sch = to_subchannel(cdev->dev.parent);
591 if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
592 return -ENODEV;
593 if (cdev->private->state != DEV_STATE_ONLINE) {
594 if (sch->schib.scsw.actl != 0)
595 return -EBUSY;
596 return -EINVAL;
597 }
598 if (sch->schib.scsw.actl != 0)
599 return -EBUSY;
600 /* Are we doing path grouping? */
601 if (!cdev->private->options.pgroup) {
602 /* No, set state offline immediately. */
603 ccw_device_done(cdev, DEV_STATE_OFFLINE);
604 return 0;
605 }
606 /* Start Set Path Group commands. */
607 cdev->private->state = DEV_STATE_DISBAND_PGID;
608 ccw_device_disband_start(cdev);
609 return 0;
610}
611
612/*
613 * Handle timeout in device online/offline process.
614 */
615static void
616ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
617{
618 int ret;
619
620 ret = ccw_device_cancel_halt_clear(cdev);
621 switch (ret) {
622 case 0:
623 ccw_device_done(cdev, DEV_STATE_BOXED);
624 break;
625 case -ENODEV:
626 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
627 break;
628 default:
629 ccw_device_set_timeout(cdev, 3*HZ);
630 }
631}
632
633/*
634 * Handle not oper event in device recognition.
635 */
636static void
637ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
638{
639 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
640}
641
642/*
643 * Handle not operational event while offline.
644 */
645static void
646ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
647{
648 struct subchannel *sch;
649
650 cdev->private->state = DEV_STATE_NOT_OPER;
651 sch = to_subchannel(cdev->dev.parent);
652 if (get_device(&cdev->dev)) {
653 PREPARE_WORK(&cdev->private->kick_work,
654 ccw_device_call_sch_unregister, (void *)cdev);
655 queue_work(ccw_device_work, &cdev->private->kick_work);
656 }
657 wake_up(&cdev->private->wait_q);
658}
659
660/*
661 * Handle not operational event while online.
662 */
663static void
664ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
665{
666 struct subchannel *sch;
667
668 sch = to_subchannel(cdev->dev.parent);
669 if (sch->driver->notify &&
670 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
671 ccw_device_set_timeout(cdev, 0);
672 cdev->private->flags.fake_irb = 0;
673 cdev->private->state = DEV_STATE_DISCONNECTED;
674 wake_up(&cdev->private->wait_q);
675 return;
676 }
677 cdev->private->state = DEV_STATE_NOT_OPER;
678 cio_disable_subchannel(sch);
679 if (sch->schib.scsw.actl != 0) {
680 // FIXME: not-oper indication to device driver ?
681 ccw_device_call_handler(cdev);
682 }
683 if (get_device(&cdev->dev)) {
684 PREPARE_WORK(&cdev->private->kick_work,
685 ccw_device_call_sch_unregister, (void *)cdev);
686 queue_work(ccw_device_work, &cdev->private->kick_work);
687 }
688 wake_up(&cdev->private->wait_q);
689}
690
691/*
692 * Handle path verification event.
693 */
694static void
695ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
696{
697 struct subchannel *sch;
698
699 if (!cdev->private->options.pgroup)
700 return;
701 if (cdev->private->state == DEV_STATE_W4SENSE) {
702 cdev->private->flags.doverify = 1;
703 return;
704 }
705 sch = to_subchannel(cdev->dev.parent);
706 /*
707 * Since we might not just be coming from an interrupt from the
708 * subchannel we have to update the schib.
709 */
710 stsch(sch->irq, &sch->schib);
711
712 if (sch->schib.scsw.actl != 0 ||
713 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
714 /*
715 * No final status yet or final status not yet delivered
716 * to the device driver. Can't do path verfication now,
717 * delay until final status was delivered.
718 */
719 cdev->private->flags.doverify = 1;
720 return;
721 }
722 /* Device is idle, we can do the path verification. */
723 cdev->private->state = DEV_STATE_VERIFY;
724 ccw_device_verify_start(cdev);
725}
726
727/*
728 * Got an interrupt for a normal io (state online).
729 */
730static void
731ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
732{
733 struct irb *irb;
734
735 irb = (struct irb *) __LC_IRB;
736 /* Check for unsolicited interrupt. */
737 if ((irb->scsw.stctl ==
738 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
739 && (!irb->scsw.cc)) {
740 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
741 !irb->esw.esw0.erw.cons) {
742 /* Unit check but no sense data. Need basic sense. */
743 if (ccw_device_do_sense(cdev, irb) != 0)
744 goto call_handler_unsol;
745 memcpy(irb, &cdev->private->irb, sizeof(struct irb));
746 cdev->private->state = DEV_STATE_W4SENSE;
747 cdev->private->intparm = 0;
748 return;
749 }
750call_handler_unsol:
751 if (cdev->handler)
752 cdev->handler (cdev, 0, irb);
753 return;
754 }
755 /* Accumulate status and find out if a basic sense is needed. */
756 ccw_device_accumulate_irb(cdev, irb);
757 if (cdev->private->flags.dosense) {
758 if (ccw_device_do_sense(cdev, irb) == 0) {
759 cdev->private->state = DEV_STATE_W4SENSE;
760 }
761 return;
762 }
763 /* Call the handler. */
764 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
765 /* Start delayed path verification. */
766 ccw_device_online_verify(cdev, 0);
767}
768
769/*
770 * Got an timeout in online state.
771 */
772static void
773ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
774{
775 int ret;
776
777 ccw_device_set_timeout(cdev, 0);
778 ret = ccw_device_cancel_halt_clear(cdev);
779 if (ret == -EBUSY) {
780 ccw_device_set_timeout(cdev, 3*HZ);
781 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
782 return;
783 }
784 if (ret == -ENODEV) {
785 struct subchannel *sch;
786
787 sch = to_subchannel(cdev->dev.parent);
788 if (!sch->lpm) {
789 PREPARE_WORK(&cdev->private->kick_work,
790 ccw_device_nopath_notify, (void *)cdev);
791 queue_work(ccw_device_notify_work,
792 &cdev->private->kick_work);
793 } else
794 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
795 } else if (cdev->handler)
796 cdev->handler(cdev, cdev->private->intparm,
797 ERR_PTR(-ETIMEDOUT));
798}
799
800/*
801 * Got an interrupt for a basic sense.
802 */
803void
804ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
805{
806 struct irb *irb;
807
808 irb = (struct irb *) __LC_IRB;
809 /* Check for unsolicited interrupt. */
810 if (irb->scsw.stctl ==
811 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
812 if (irb->scsw.cc == 1)
813 /* Basic sense hasn't started. Try again. */
814 ccw_device_do_sense(cdev, irb);
815 else {
816 printk("Huh? %s(%s): unsolicited interrupt...\n",
817 __FUNCTION__, cdev->dev.bus_id);
818 if (cdev->handler)
819 cdev->handler (cdev, 0, irb);
820 }
821 return;
822 }
823 /* Add basic sense info to irb. */
824 ccw_device_accumulate_basic_sense(cdev, irb);
825 if (cdev->private->flags.dosense) {
826 /* Another basic sense is needed. */
827 ccw_device_do_sense(cdev, irb);
828 return;
829 }
830 cdev->private->state = DEV_STATE_ONLINE;
831 /* Call the handler. */
832 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
833 /* Start delayed path verification. */
834 ccw_device_online_verify(cdev, 0);
835}
836
837static void
838ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
839{
840 struct irb *irb;
841
842 irb = (struct irb *) __LC_IRB;
843 /* Accumulate status. We don't do basic sense. */
844 ccw_device_accumulate_irb(cdev, irb);
845 /* Try to start delayed device verification. */
846 ccw_device_online_verify(cdev, 0);
847 /* Note: Don't call handler for cio initiated clear! */
848}
849
850static void
851ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
852{
853 struct subchannel *sch;
854
855 sch = to_subchannel(cdev->dev.parent);
856 ccw_device_set_timeout(cdev, 0);
857 /* OK, i/o is dead now. Call interrupt handler. */
858 cdev->private->state = DEV_STATE_ONLINE;
859 if (cdev->handler)
860 cdev->handler(cdev, cdev->private->intparm,
861 ERR_PTR(-ETIMEDOUT));
862 if (!sch->lpm) {
863 PREPARE_WORK(&cdev->private->kick_work,
864 ccw_device_nopath_notify, (void *)cdev);
865 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
866 } else if (cdev->private->flags.doverify)
867 /* Start delayed path verification. */
868 ccw_device_online_verify(cdev, 0);
869}
870
871static void
872ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
873{
874 int ret;
875
876 ret = ccw_device_cancel_halt_clear(cdev);
877 if (ret == -EBUSY) {
878 ccw_device_set_timeout(cdev, 3*HZ);
879 return;
880 }
881 if (ret == -ENODEV) {
882 struct subchannel *sch;
883
884 sch = to_subchannel(cdev->dev.parent);
885 if (!sch->lpm) {
886 PREPARE_WORK(&cdev->private->kick_work,
887 ccw_device_nopath_notify, (void *)cdev);
888 queue_work(ccw_device_notify_work,
889 &cdev->private->kick_work);
890 } else
891 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
892 return;
893 }
894 //FIXME: Can we get here?
895 cdev->private->state = DEV_STATE_ONLINE;
896 if (cdev->handler)
897 cdev->handler(cdev, cdev->private->intparm,
898 ERR_PTR(-ETIMEDOUT));
899}
900
901static void
902ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
903{
904 struct irb *irb;
905 struct subchannel *sch;
906
907 irb = (struct irb *) __LC_IRB;
908 /*
909 * Accumulate status and find out if a basic sense is needed.
910 * This is fine since we have already adapted the lpm.
911 */
912 ccw_device_accumulate_irb(cdev, irb);
913 if (cdev->private->flags.dosense) {
914 if (ccw_device_do_sense(cdev, irb) == 0) {
915 cdev->private->state = DEV_STATE_W4SENSE;
916 }
917 return;
918 }
919
920 /* Iff device is idle, reset timeout. */
921 sch = to_subchannel(cdev->dev.parent);
922 if (!stsch(sch->irq, &sch->schib))
923 if (sch->schib.scsw.actl == 0)
924 ccw_device_set_timeout(cdev, 0);
925 /* Call the handler. */
926 ccw_device_call_handler(cdev);
927 if (!sch->lpm) {
928 PREPARE_WORK(&cdev->private->kick_work,
929 ccw_device_nopath_notify, (void *)cdev);
930 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
931 } else if (cdev->private->flags.doverify)
932 ccw_device_online_verify(cdev, 0);
933}
934
935static void
936ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
937{
938 int ret;
939 struct subchannel *sch;
940
941 sch = to_subchannel(cdev->dev.parent);
942 ccw_device_set_timeout(cdev, 0);
943 ret = ccw_device_cancel_halt_clear(cdev);
944 if (ret == -EBUSY) {
945 ccw_device_set_timeout(cdev, 3*HZ);
946 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
947 return;
948 }
949 if (ret == -ENODEV) {
950 if (!sch->lpm) {
951 PREPARE_WORK(&cdev->private->kick_work,
952 ccw_device_nopath_notify, (void *)cdev);
953 queue_work(ccw_device_notify_work,
954 &cdev->private->kick_work);
955 } else
956 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
957 return;
958 }
959 if (cdev->handler)
960 cdev->handler(cdev, cdev->private->intparm,
961 ERR_PTR(-ETIMEDOUT));
962 if (!sch->lpm) {
963 PREPARE_WORK(&cdev->private->kick_work,
964 ccw_device_nopath_notify, (void *)cdev);
965 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
966 } else if (cdev->private->flags.doverify)
967 /* Start delayed path verification. */
968 ccw_device_online_verify(cdev, 0);
969}
970
971static void
972ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
973{
974 /* When the I/O has terminated, we have to start verification. */
975 if (cdev->private->options.pgroup)
976 cdev->private->flags.doverify = 1;
977}
978
979static void
980ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
981{
982 struct irb *irb;
983
984 switch (dev_event) {
985 case DEV_EVENT_INTERRUPT:
986 irb = (struct irb *) __LC_IRB;
987 /* Check for unsolicited interrupt. */
988 if ((irb->scsw.stctl ==
989 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
990 (!irb->scsw.cc))
991 /* FIXME: we should restart stlck here, but this
992 * is extremely unlikely ... */
993 goto out_wakeup;
994
995 ccw_device_accumulate_irb(cdev, irb);
996 /* We don't care about basic sense etc. */
997 break;
998 default: /* timeout */
999 break;
1000 }
1001out_wakeup:
1002 wake_up(&cdev->private->wait_q);
1003}
1004
1005static void
1006ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1007{
1008 struct subchannel *sch;
1009
1010 sch = to_subchannel(cdev->dev.parent);
1011 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1012 /* Couldn't enable the subchannel for i/o. Sick device. */
1013 return;
1014
1015 /* After 60s the device recognition is considered to have failed. */
1016 ccw_device_set_timeout(cdev, 60*HZ);
1017
1018 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1019 ccw_device_sense_id_start(cdev);
1020}
1021
1022void
1023device_trigger_reprobe(struct subchannel *sch)
1024{
1025 struct ccw_device *cdev;
1026
1027 if (!sch->dev.driver_data)
1028 return;
1029 cdev = sch->dev.driver_data;
1030 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1031 return;
1032
1033 /* Update some values. */
1034 if (stsch(sch->irq, &sch->schib))
1035 return;
1036
1037 /*
1038 * The pim, pam, pom values may not be accurate, but they are the best
1039 * we have before performing device selection :/
1040 */
1041 sch->lpm = sch->schib.pmcw.pim &
1042 sch->schib.pmcw.pam &
1043 sch->schib.pmcw.pom &
1044 sch->opm;
1045 /* Re-set some bits in the pmcw that were lost. */
1046 sch->schib.pmcw.isc = 3;
1047 sch->schib.pmcw.csense = 1;
1048 sch->schib.pmcw.ena = 0;
1049 if ((sch->lpm & (sch->lpm - 1)) != 0)
1050 sch->schib.pmcw.mp = 1;
1051 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1052 /* We should also udate ssd info, but this has to wait. */
1053 ccw_device_start_id(cdev, 0);
1054}
1055
1056static void
1057ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1058{
1059 struct subchannel *sch;
1060
1061 sch = to_subchannel(cdev->dev.parent);
1062 /*
1063 * An interrupt in state offline means a previous disable was not
1064 * successful. Try again.
1065 */
1066 cio_disable_subchannel(sch);
1067}
1068
1069static void
1070ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1071{
1072 retry_set_schib(cdev);
1073 cdev->private->state = DEV_STATE_ONLINE;
1074 dev_fsm_event(cdev, dev_event);
1075}
1076
1077
1078static void
1079ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1080{
1081 ccw_device_set_timeout(cdev, 0);
1082 if (dev_event == DEV_EVENT_NOTOPER)
1083 cdev->private->state = DEV_STATE_NOT_OPER;
1084 else
1085 cdev->private->state = DEV_STATE_OFFLINE;
1086 wake_up(&cdev->private->wait_q);
1087}
1088
1089static void
1090ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1091{
1092 int ret;
1093
1094 ret = ccw_device_cancel_halt_clear(cdev);
1095 switch (ret) {
1096 case 0:
1097 cdev->private->state = DEV_STATE_OFFLINE;
1098 wake_up(&cdev->private->wait_q);
1099 break;
1100 case -ENODEV:
1101 cdev->private->state = DEV_STATE_NOT_OPER;
1102 wake_up(&cdev->private->wait_q);
1103 break;
1104 default:
1105 ccw_device_set_timeout(cdev, HZ/10);
1106 }
1107}
1108
1109/*
1110 * No operation action. This is used e.g. to ignore a timeout event in
1111 * state offline.
1112 */
1113static void
1114ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1115{
1116}
1117
1118/*
1119 * Bug operation action.
1120 */
1121static void
1122ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1123{
1124 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1125 cdev->private->state, dev_event);
1126 BUG();
1127}
1128
1129/*
1130 * device statemachine
1131 */
1132fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1133 [DEV_STATE_NOT_OPER] = {
1134 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1135 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1136 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1137 [DEV_EVENT_VERIFY] = ccw_device_nop,
1138 },
1139 [DEV_STATE_SENSE_PGID] = {
1140 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1141 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1142 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1143 [DEV_EVENT_VERIFY] = ccw_device_nop,
1144 },
1145 [DEV_STATE_SENSE_ID] = {
1146 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1147 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1148 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1149 [DEV_EVENT_VERIFY] = ccw_device_nop,
1150 },
1151 [DEV_STATE_OFFLINE] = {
1152 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1153 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1154 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1155 [DEV_EVENT_VERIFY] = ccw_device_nop,
1156 },
1157 [DEV_STATE_VERIFY] = {
1158 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1159 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1160 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1161 [DEV_EVENT_VERIFY] = ccw_device_nop,
1162 },
1163 [DEV_STATE_ONLINE] = {
1164 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1165 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1166 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1167 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1168 },
1169 [DEV_STATE_W4SENSE] = {
1170 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1171 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1172 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1173 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1174 },
1175 [DEV_STATE_DISBAND_PGID] = {
1176 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1177 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1178 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1179 [DEV_EVENT_VERIFY] = ccw_device_nop,
1180 },
1181 [DEV_STATE_BOXED] = {
1182 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1183 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1184 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1185 [DEV_EVENT_VERIFY] = ccw_device_nop,
1186 },
1187 /* states to wait for i/o completion before doing something */
1188 [DEV_STATE_CLEAR_VERIFY] = {
1189 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1190 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1191 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1192 [DEV_EVENT_VERIFY] = ccw_device_nop,
1193 },
1194 [DEV_STATE_TIMEOUT_KILL] = {
1195 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1196 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1197 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1198 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1199 },
1200 [DEV_STATE_WAIT4IO] = {
1201 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1202 [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq,
1203 [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout,
1204 [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify,
1205 },
1206 [DEV_STATE_QUIESCE] = {
1207 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1208 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1209 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1210 [DEV_EVENT_VERIFY] = ccw_device_nop,
1211 },
1212 /* special states for devices gone not operational */
1213 [DEV_STATE_DISCONNECTED] = {
1214 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1215 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1216 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
1217 [DEV_EVENT_VERIFY] = ccw_device_nop,
1218 },
1219 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1220 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1221 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1222 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1223 [DEV_EVENT_VERIFY] = ccw_device_nop,
1224 },
1225 [DEV_STATE_CMFCHANGE] = {
1226 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1227 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1228 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1229 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1230 },
1231};
1232
1233/*
1234 * io_subchannel_irq is called for "real" interrupts or for status
1235 * pending conditions on msch.
1236 */
1237void
1238io_subchannel_irq (struct device *pdev)
1239{
1240 struct ccw_device *cdev;
1241
1242 cdev = to_subchannel(pdev)->dev.driver_data;
1243
1244 CIO_TRACE_EVENT (3, "IRQ");
1245 CIO_TRACE_EVENT (3, pdev->bus_id);
1246 if (cdev)
1247 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1248}
1249
1250EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 02:44:24 -0500