2 * drivers/s390/cio/device_fsm.c
3 * finite state machine for device handling
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/jiffies.h>
14 #include <linux/string.h>
16 #include <asm/ccwdev.h>
20 #include "cio_debug.h"
27 device_is_online(struct subchannel *sch)
29 struct ccw_device *cdev;
31 if (!sch->dev.driver_data)
33 cdev = sch->dev.driver_data;
34 return (cdev->private->state == DEV_STATE_ONLINE);
38 device_is_disconnected(struct subchannel *sch)
40 struct ccw_device *cdev;
42 if (!sch->dev.driver_data)
44 cdev = sch->dev.driver_data;
45 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
46 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
50 device_set_disconnected(struct subchannel *sch)
52 struct ccw_device *cdev;
54 if (!sch->dev.driver_data)
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;
63 device_set_waiting(struct subchannel *sch)
65 struct ccw_device *cdev;
67 if (!sch->dev.driver_data)
69 cdev = sch->dev.driver_data;
70 ccw_device_set_timeout(cdev, 10*HZ);
71 cdev->private->state = DEV_STATE_WAIT4IO;
75 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
78 ccw_device_timeout(unsigned long data)
80 struct ccw_device *cdev;
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);
92 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
95 del_timer(&cdev->private->timer);
98 if (timer_pending(&cdev->private->timer)) {
99 if (mod_timer(&cdev->private->timer, jiffies + expires))
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);
108 /* Kill any pending timers after machine check. */
110 device_kill_pending_timer(struct subchannel *sch)
112 struct ccw_device *cdev;
114 if (!sch->dev.driver_data)
116 cdev = sch->dev.driver_data;
117 ccw_device_set_timeout(cdev, 0);
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
129 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
131 struct subchannel *sch;
134 sch = to_subchannel(cdev->dev.parent);
135 ret = stsch(sch->schid, &sch->schib);
136 if (ret || !sch->schib.pmcw.dnv)
138 if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
139 /* Not operational or no activity -> done. */
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);
147 /* cancel io unsuccessful. From now on it is asynchronous. */
148 cdev->private->iretry = 3; /* 3 halt retries. */
150 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
151 /* Stage 2: halt io. */
152 if (cdev->private->iretry) {
153 cdev->private->iretry--;
155 return (ret == 0) ? -EBUSY : ret;
157 /* halt io unsuccessful. */
158 cdev->private->iretry = 255; /* 255 clear retries. */
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;
166 panic("Can't stop i/o on subchannel.\n");
170 ccw_device_handle_oper(struct ccw_device *cdev)
172 struct subchannel *sch;
174 sch = to_subchannel(cdev->dev.parent);
175 cdev->private->flags.recog_done = 1;
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.
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);
191 cdev->private->flags.donotify = 1;
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).
201 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
205 for (i = 0; i<8; i++) {
207 if (!(sch->lpm & mask))
211 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
216 * Stop device recognition.
219 ccw_device_recog_done(struct ccw_device *cdev, int state)
221 struct subchannel *sch;
222 int notify, old_lpm, same_dev;
224 sch = to_subchannel(cdev->dev.parent);
226 ccw_device_set_timeout(cdev, 0);
227 cio_disable_subchannel(sch);
229 * Now that we tried recognition, we have performed device selection
230 * through ssch() and the path information is up to date.
233 stsch(sch->schid, &sch->schib);
234 sch->lpm = sch->schib.pmcw.pim &
235 sch->schib.pmcw.pam &
236 sch->schib.pmcw.pom &
238 /* Check since device may again have become not operational. */
239 if (!sch->schib.pmcw.dnv)
240 state = DEV_STATE_NOT_OPER;
241 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
242 /* Force reprobe on all chpids. */
244 if (sch->lpm != old_lpm)
245 __recover_lost_chpids(sch, old_lpm);
246 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
247 if (state == DEV_STATE_NOT_OPER) {
248 cdev->private->flags.recog_done = 1;
249 cdev->private->state = DEV_STATE_DISCONNECTED;
252 /* Boxed devices don't need extra treatment. */
255 same_dev = 0; /* Keep the compiler quiet... */
257 case DEV_STATE_NOT_OPER:
258 CIO_DEBUG(KERN_WARNING, 2,
259 "SenseID : unknown device %04x on subchannel "
260 "0.%x.%04x\n", cdev->private->devno,
261 sch->schid.ssid, sch->schid.sch_no);
263 case DEV_STATE_OFFLINE:
264 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
265 same_dev = ccw_device_handle_oper(cdev);
268 /* fill out sense information */
269 cdev->id = (struct ccw_device_id) {
270 .cu_type = cdev->private->senseid.cu_type,
271 .cu_model = cdev->private->senseid.cu_model,
272 .dev_type = cdev->private->senseid.dev_type,
273 .dev_model = cdev->private->senseid.dev_model,
276 cdev->private->state = DEV_STATE_OFFLINE;
278 /* Get device online again. */
279 ccw_device_online(cdev);
280 wake_up(&cdev->private->wait_q);
284 /* Issue device info message. */
285 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
286 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
288 cdev->private->ssid, cdev->private->devno,
289 cdev->id.cu_type, cdev->id.cu_model,
290 cdev->id.dev_type, cdev->id.dev_model);
292 case DEV_STATE_BOXED:
293 CIO_DEBUG(KERN_WARNING, 2,
294 "SenseID : boxed device %04x on subchannel "
295 "0.%x.%04x\n", cdev->private->devno,
296 sch->schid.ssid, sch->schid.sch_no);
299 cdev->private->state = state;
300 io_subchannel_recog_done(cdev);
301 if (state != DEV_STATE_NOT_OPER)
302 wake_up(&cdev->private->wait_q);
306 * Function called from device_id.c after sense id has completed.
309 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
313 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
315 case -ETIME: /* Sense id stopped by timeout. */
316 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
319 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
325 ccw_device_oper_notify(void *data)
327 struct ccw_device *cdev;
328 struct subchannel *sch;
331 cdev = (struct ccw_device *)data;
332 sch = to_subchannel(cdev->dev.parent);
333 ret = (sch->driver && sch->driver->notify) ?
334 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
336 /* Driver doesn't want device back. */
337 ccw_device_do_unreg_rereg((void *)cdev);
339 /* Reenable channel measurements, if needed. */
341 wake_up(&cdev->private->wait_q);
346 * Finished with online/offline processing.
349 ccw_device_done(struct ccw_device *cdev, int state)
351 struct subchannel *sch;
353 sch = to_subchannel(cdev->dev.parent);
355 if (state != DEV_STATE_ONLINE)
356 cio_disable_subchannel(sch);
358 /* Reset device status. */
359 memset(&cdev->private->irb, 0, sizeof(struct irb));
361 cdev->private->state = state;
364 if (state == DEV_STATE_BOXED)
365 CIO_DEBUG(KERN_WARNING, 2,
366 "Boxed device %04x on subchannel %04x\n",
367 cdev->private->devno, sch->schid.sch_no);
369 if (cdev->private->flags.donotify) {
370 cdev->private->flags.donotify = 0;
371 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
373 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
375 wake_up(&cdev->private->wait_q);
377 if (css_init_done && state != DEV_STATE_ONLINE)
378 put_device (&cdev->dev);
381 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
389 return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
392 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
398 for (i = 0; i < 8; i++) {
399 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
402 if (cdev->private->pgid[last].inf.ps.state1 ==
404 /* First non-zero PGID */
408 if (cmp_pgid(&cdev->private->pgid[i],
409 &cdev->private->pgid[last]) == 0)
410 /* Non-conflicting PGIDs */
413 /* PGID mismatch, can't pathgroup. */
414 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
415 "0.%x.%04x, can't pathgroup\n",
416 cdev->private->ssid, cdev->private->devno);
417 cdev->private->options.pgroup = 0;
420 if (cdev->private->pgid[last].inf.ps.state1 ==
422 /* No previous pgid found */
423 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
424 sizeof(struct pgid));
426 /* Use existing pgid */
427 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
428 sizeof(struct pgid));
432 * Function called from device_pgid.c after sense path ground has completed.
435 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
437 struct subchannel *sch;
439 sch = to_subchannel(cdev->dev.parent);
441 case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
442 cdev->private->options.pgroup = 0;
444 case 0: /* success */
445 case -EACCES: /* partial success, some paths not operational */
446 /* Check if all pgids are equal or 0. */
447 __ccw_device_get_common_pgid(cdev);
449 case -ETIME: /* Sense path group id stopped by timeout. */
450 case -EUSERS: /* device is reserved for someone else. */
451 ccw_device_done(cdev, DEV_STATE_BOXED);
454 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
457 /* Start Path Group verification. */
458 sch->vpm = 0; /* Start with no path groups set. */
459 cdev->private->state = DEV_STATE_VERIFY;
460 ccw_device_verify_start(cdev);
464 * Start device recognition.
467 ccw_device_recognition(struct ccw_device *cdev)
469 struct subchannel *sch;
472 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
473 (cdev->private->state != DEV_STATE_BOXED))
475 sch = to_subchannel(cdev->dev.parent);
476 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
478 /* Couldn't enable the subchannel for i/o. Sick device. */
481 /* After 60s the device recognition is considered to have failed. */
482 ccw_device_set_timeout(cdev, 60*HZ);
485 * We used to start here with a sense pgid to find out whether a device
486 * is locked by someone else. Unfortunately, the sense pgid command
487 * code has other meanings on devices predating the path grouping
488 * algorithm, so we start with sense id and box the device after an
489 * timeout (or if sense pgid during path verification detects the device
490 * is locked, as may happen on newer devices).
492 cdev->private->flags.recog_done = 0;
493 cdev->private->state = DEV_STATE_SENSE_ID;
494 ccw_device_sense_id_start(cdev);
499 * Handle timeout in device recognition.
502 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
506 ret = ccw_device_cancel_halt_clear(cdev);
509 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
512 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
515 ccw_device_set_timeout(cdev, 3*HZ);
521 ccw_device_nopath_notify(void *data)
523 struct ccw_device *cdev;
524 struct subchannel *sch;
527 cdev = (struct ccw_device *)data;
528 sch = to_subchannel(cdev->dev.parent);
532 ret = (sch->driver && sch->driver->notify) ?
533 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
535 if (get_device(&sch->dev)) {
536 /* Driver doesn't want to keep device. */
537 cio_disable_subchannel(sch);
538 if (get_device(&cdev->dev)) {
539 PREPARE_WORK(&cdev->private->kick_work,
540 ccw_device_call_sch_unregister,
542 queue_work(ccw_device_work,
543 &cdev->private->kick_work);
545 put_device(&sch->dev);
548 cio_disable_subchannel(sch);
549 ccw_device_set_timeout(cdev, 0);
550 cdev->private->flags.fake_irb = 0;
551 cdev->private->state = DEV_STATE_DISCONNECTED;
552 wake_up(&cdev->private->wait_q);
557 ccw_device_verify_done(struct ccw_device *cdev, int err)
559 cdev->private->flags.doverify = 0;
561 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
562 cdev->private->options.pgroup = 0;
564 ccw_device_done(cdev, DEV_STATE_ONLINE);
565 /* Deliver fake irb to device driver, if needed. */
566 if (cdev->private->flags.fake_irb) {
567 memset(&cdev->private->irb, 0, sizeof(struct irb));
568 cdev->private->irb.scsw = (struct scsw) {
570 .fctl = SCSW_FCTL_START_FUNC,
571 .actl = SCSW_ACTL_START_PEND,
572 .stctl = SCSW_STCTL_STATUS_PEND,
574 cdev->private->flags.fake_irb = 0;
576 cdev->handler(cdev, cdev->private->intparm,
577 &cdev->private->irb);
578 memset(&cdev->private->irb, 0, sizeof(struct irb));
582 ccw_device_done(cdev, DEV_STATE_BOXED);
585 PREPARE_WORK(&cdev->private->kick_work,
586 ccw_device_nopath_notify, (void *)cdev);
587 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
588 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
597 ccw_device_online(struct ccw_device *cdev)
599 struct subchannel *sch;
602 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
603 (cdev->private->state != DEV_STATE_BOXED))
605 sch = to_subchannel(cdev->dev.parent);
606 if (css_init_done && !get_device(&cdev->dev))
608 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
610 /* Couldn't enable the subchannel for i/o. Sick device. */
612 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
615 /* Do we want to do path grouping? */
616 if (!cdev->private->options.pgroup) {
617 /* Start initial path verification. */
618 cdev->private->state = DEV_STATE_VERIFY;
619 ccw_device_verify_start(cdev);
622 /* Do a SensePGID first. */
623 cdev->private->state = DEV_STATE_SENSE_PGID;
624 ccw_device_sense_pgid_start(cdev);
629 ccw_device_disband_done(struct ccw_device *cdev, int err)
633 ccw_device_done(cdev, DEV_STATE_OFFLINE);
636 ccw_device_done(cdev, DEV_STATE_BOXED);
639 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
648 ccw_device_offline(struct ccw_device *cdev)
650 struct subchannel *sch;
652 sch = to_subchannel(cdev->dev.parent);
653 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
655 if (cdev->private->state != DEV_STATE_ONLINE) {
656 if (sch->schib.scsw.actl != 0)
660 if (sch->schib.scsw.actl != 0)
662 /* Are we doing path grouping? */
663 if (!cdev->private->options.pgroup) {
664 /* No, set state offline immediately. */
666 ccw_device_done(cdev, DEV_STATE_OFFLINE);
669 /* Start Set Path Group commands. */
670 cdev->private->state = DEV_STATE_DISBAND_PGID;
671 ccw_device_disband_start(cdev);
676 * Handle timeout in device online/offline process.
679 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
683 ret = ccw_device_cancel_halt_clear(cdev);
686 ccw_device_done(cdev, DEV_STATE_BOXED);
689 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
692 ccw_device_set_timeout(cdev, 3*HZ);
697 * Handle not oper event in device recognition.
700 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
702 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
706 * Handle not operational event while offline.
709 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
711 struct subchannel *sch;
713 cdev->private->state = DEV_STATE_NOT_OPER;
714 sch = to_subchannel(cdev->dev.parent);
715 if (get_device(&cdev->dev)) {
716 PREPARE_WORK(&cdev->private->kick_work,
717 ccw_device_call_sch_unregister, (void *)cdev);
718 queue_work(ccw_device_work, &cdev->private->kick_work);
720 wake_up(&cdev->private->wait_q);
724 * Handle not operational event while online.
727 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
729 struct subchannel *sch;
731 sch = to_subchannel(cdev->dev.parent);
732 if (sch->driver->notify &&
733 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
734 ccw_device_set_timeout(cdev, 0);
735 cdev->private->flags.fake_irb = 0;
736 cdev->private->state = DEV_STATE_DISCONNECTED;
737 wake_up(&cdev->private->wait_q);
740 cdev->private->state = DEV_STATE_NOT_OPER;
741 cio_disable_subchannel(sch);
742 if (sch->schib.scsw.actl != 0) {
743 // FIXME: not-oper indication to device driver ?
744 ccw_device_call_handler(cdev);
746 if (get_device(&cdev->dev)) {
747 PREPARE_WORK(&cdev->private->kick_work,
748 ccw_device_call_sch_unregister, (void *)cdev);
749 queue_work(ccw_device_work, &cdev->private->kick_work);
751 wake_up(&cdev->private->wait_q);
755 * Handle path verification event.
758 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
760 struct subchannel *sch;
762 if (cdev->private->state == DEV_STATE_W4SENSE) {
763 cdev->private->flags.doverify = 1;
766 sch = to_subchannel(cdev->dev.parent);
768 * Since we might not just be coming from an interrupt from the
769 * subchannel we have to update the schib.
771 stsch(sch->schid, &sch->schib);
773 if (sch->schib.scsw.actl != 0 ||
774 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
776 * No final status yet or final status not yet delivered
777 * to the device driver. Can't do path verfication now,
778 * delay until final status was delivered.
780 cdev->private->flags.doverify = 1;
783 /* Device is idle, we can do the path verification. */
784 cdev->private->state = DEV_STATE_VERIFY;
785 ccw_device_verify_start(cdev);
789 * Got an interrupt for a normal io (state online).
792 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
796 irb = (struct irb *) __LC_IRB;
797 /* Check for unsolicited interrupt. */
798 if ((irb->scsw.stctl ==
799 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
800 && (!irb->scsw.cc)) {
801 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
802 !irb->esw.esw0.erw.cons) {
803 /* Unit check but no sense data. Need basic sense. */
804 if (ccw_device_do_sense(cdev, irb) != 0)
805 goto call_handler_unsol;
806 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
807 cdev->private->state = DEV_STATE_W4SENSE;
808 cdev->private->intparm = 0;
813 cdev->handler (cdev, 0, irb);
816 /* Accumulate status and find out if a basic sense is needed. */
817 ccw_device_accumulate_irb(cdev, irb);
818 if (cdev->private->flags.dosense) {
819 if (ccw_device_do_sense(cdev, irb) == 0) {
820 cdev->private->state = DEV_STATE_W4SENSE;
824 /* Call the handler. */
825 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
826 /* Start delayed path verification. */
827 ccw_device_online_verify(cdev, 0);
831 * Got an timeout in online state.
834 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
838 ccw_device_set_timeout(cdev, 0);
839 ret = ccw_device_cancel_halt_clear(cdev);
841 ccw_device_set_timeout(cdev, 3*HZ);
842 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
845 if (ret == -ENODEV) {
846 struct subchannel *sch;
848 sch = to_subchannel(cdev->dev.parent);
850 PREPARE_WORK(&cdev->private->kick_work,
851 ccw_device_nopath_notify, (void *)cdev);
852 queue_work(ccw_device_notify_work,
853 &cdev->private->kick_work);
855 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
856 } else if (cdev->handler)
857 cdev->handler(cdev, cdev->private->intparm,
858 ERR_PTR(-ETIMEDOUT));
862 * Got an interrupt for a basic sense.
865 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
869 irb = (struct irb *) __LC_IRB;
870 /* Check for unsolicited interrupt. */
871 if (irb->scsw.stctl ==
872 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
873 if (irb->scsw.cc == 1)
874 /* Basic sense hasn't started. Try again. */
875 ccw_device_do_sense(cdev, irb);
877 printk("Huh? %s(%s): unsolicited interrupt...\n",
878 __FUNCTION__, cdev->dev.bus_id);
880 cdev->handler (cdev, 0, irb);
885 * Check if a halt or clear has been issued in the meanwhile. If yes,
886 * only deliver the halt/clear interrupt to the device driver as if it
887 * had killed the original request.
889 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
890 cdev->private->flags.dosense = 0;
891 memset(&cdev->private->irb, 0, sizeof(struct irb));
892 ccw_device_accumulate_irb(cdev, irb);
895 /* Add basic sense info to irb. */
896 ccw_device_accumulate_basic_sense(cdev, irb);
897 if (cdev->private->flags.dosense) {
898 /* Another basic sense is needed. */
899 ccw_device_do_sense(cdev, irb);
903 cdev->private->state = DEV_STATE_ONLINE;
904 /* Call the handler. */
905 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
906 /* Start delayed path verification. */
907 ccw_device_online_verify(cdev, 0);
911 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
915 irb = (struct irb *) __LC_IRB;
916 /* Accumulate status. We don't do basic sense. */
917 ccw_device_accumulate_irb(cdev, irb);
918 /* Remember to clear irb to avoid residuals. */
919 memset(&cdev->private->irb, 0, sizeof(struct irb));
920 /* Try to start delayed device verification. */
921 ccw_device_online_verify(cdev, 0);
922 /* Note: Don't call handler for cio initiated clear! */
926 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
928 struct subchannel *sch;
930 sch = to_subchannel(cdev->dev.parent);
931 ccw_device_set_timeout(cdev, 0);
932 /* OK, i/o is dead now. Call interrupt handler. */
933 cdev->private->state = DEV_STATE_ONLINE;
935 cdev->handler(cdev, cdev->private->intparm,
936 ERR_PTR(-ETIMEDOUT));
938 PREPARE_WORK(&cdev->private->kick_work,
939 ccw_device_nopath_notify, (void *)cdev);
940 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
941 } else if (cdev->private->flags.doverify)
942 /* Start delayed path verification. */
943 ccw_device_online_verify(cdev, 0);
947 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
951 ret = ccw_device_cancel_halt_clear(cdev);
953 ccw_device_set_timeout(cdev, 3*HZ);
956 if (ret == -ENODEV) {
957 struct subchannel *sch;
959 sch = to_subchannel(cdev->dev.parent);
961 PREPARE_WORK(&cdev->private->kick_work,
962 ccw_device_nopath_notify, (void *)cdev);
963 queue_work(ccw_device_notify_work,
964 &cdev->private->kick_work);
966 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
969 //FIXME: Can we get here?
970 cdev->private->state = DEV_STATE_ONLINE;
972 cdev->handler(cdev, cdev->private->intparm,
973 ERR_PTR(-ETIMEDOUT));
977 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
980 struct subchannel *sch;
982 irb = (struct irb *) __LC_IRB;
984 * Accumulate status and find out if a basic sense is needed.
985 * This is fine since we have already adapted the lpm.
987 ccw_device_accumulate_irb(cdev, irb);
988 if (cdev->private->flags.dosense) {
989 if (ccw_device_do_sense(cdev, irb) == 0) {
990 cdev->private->state = DEV_STATE_W4SENSE;
995 /* Iff device is idle, reset timeout. */
996 sch = to_subchannel(cdev->dev.parent);
997 if (!stsch(sch->schid, &sch->schib))
998 if (sch->schib.scsw.actl == 0)
999 ccw_device_set_timeout(cdev, 0);
1000 /* Call the handler. */
1001 ccw_device_call_handler(cdev);
1003 PREPARE_WORK(&cdev->private->kick_work,
1004 ccw_device_nopath_notify, (void *)cdev);
1005 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1006 } else if (cdev->private->flags.doverify)
1007 ccw_device_online_verify(cdev, 0);
1011 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1014 struct subchannel *sch;
1016 sch = to_subchannel(cdev->dev.parent);
1017 ccw_device_set_timeout(cdev, 0);
1018 ret = ccw_device_cancel_halt_clear(cdev);
1019 if (ret == -EBUSY) {
1020 ccw_device_set_timeout(cdev, 3*HZ);
1021 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1024 if (ret == -ENODEV) {
1026 PREPARE_WORK(&cdev->private->kick_work,
1027 ccw_device_nopath_notify, (void *)cdev);
1028 queue_work(ccw_device_notify_work,
1029 &cdev->private->kick_work);
1031 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1035 cdev->handler(cdev, cdev->private->intparm,
1036 ERR_PTR(-ETIMEDOUT));
1038 PREPARE_WORK(&cdev->private->kick_work,
1039 ccw_device_nopath_notify, (void *)cdev);
1040 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1041 } else if (cdev->private->flags.doverify)
1042 /* Start delayed path verification. */
1043 ccw_device_online_verify(cdev, 0);
1047 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1049 /* When the I/O has terminated, we have to start verification. */
1050 cdev->private->flags.doverify = 1;
1054 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1058 switch (dev_event) {
1059 case DEV_EVENT_INTERRUPT:
1060 irb = (struct irb *) __LC_IRB;
1061 /* Check for unsolicited interrupt. */
1062 if ((irb->scsw.stctl ==
1063 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1065 /* FIXME: we should restart stlck here, but this
1066 * is extremely unlikely ... */
1069 ccw_device_accumulate_irb(cdev, irb);
1070 /* We don't care about basic sense etc. */
1072 default: /* timeout */
1076 wake_up(&cdev->private->wait_q);
1080 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1082 struct subchannel *sch;
1084 sch = to_subchannel(cdev->dev.parent);
1085 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1086 /* Couldn't enable the subchannel for i/o. Sick device. */
1089 /* After 60s the device recognition is considered to have failed. */
1090 ccw_device_set_timeout(cdev, 60*HZ);
1092 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1093 ccw_device_sense_id_start(cdev);
1097 device_trigger_reprobe(struct subchannel *sch)
1099 struct ccw_device *cdev;
1101 if (!sch->dev.driver_data)
1103 cdev = sch->dev.driver_data;
1104 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1107 /* Update some values. */
1108 if (stsch(sch->schid, &sch->schib))
1112 * The pim, pam, pom values may not be accurate, but they are the best
1113 * we have before performing device selection :/
1115 sch->lpm = sch->schib.pmcw.pim &
1116 sch->schib.pmcw.pam &
1117 sch->schib.pmcw.pom &
1119 /* Re-set some bits in the pmcw that were lost. */
1120 sch->schib.pmcw.isc = 3;
1121 sch->schib.pmcw.csense = 1;
1122 sch->schib.pmcw.ena = 0;
1123 if ((sch->lpm & (sch->lpm - 1)) != 0)
1124 sch->schib.pmcw.mp = 1;
1125 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1126 /* We should also udate ssd info, but this has to wait. */
1127 ccw_device_start_id(cdev, 0);
1131 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1133 struct subchannel *sch;
1135 sch = to_subchannel(cdev->dev.parent);
1137 * An interrupt in state offline means a previous disable was not
1138 * successful. Try again.
1140 cio_disable_subchannel(sch);
1144 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1146 retry_set_schib(cdev);
1147 cdev->private->state = DEV_STATE_ONLINE;
1148 dev_fsm_event(cdev, dev_event);
1151 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1152 enum dev_event dev_event)
1154 cmf_retry_copy_block(cdev);
1155 cdev->private->state = DEV_STATE_ONLINE;
1156 dev_fsm_event(cdev, dev_event);
1160 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1162 ccw_device_set_timeout(cdev, 0);
1163 if (dev_event == DEV_EVENT_NOTOPER)
1164 cdev->private->state = DEV_STATE_NOT_OPER;
1166 cdev->private->state = DEV_STATE_OFFLINE;
1167 wake_up(&cdev->private->wait_q);
1171 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1175 ret = ccw_device_cancel_halt_clear(cdev);
1178 cdev->private->state = DEV_STATE_OFFLINE;
1179 wake_up(&cdev->private->wait_q);
1182 cdev->private->state = DEV_STATE_NOT_OPER;
1183 wake_up(&cdev->private->wait_q);
1186 ccw_device_set_timeout(cdev, HZ/10);
1191 * No operation action. This is used e.g. to ignore a timeout event in
1195 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1200 * Bug operation action.
1203 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1205 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1206 cdev->private->state, dev_event);
1211 * device statemachine
1213 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1214 [DEV_STATE_NOT_OPER] = {
1215 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1216 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1217 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1218 [DEV_EVENT_VERIFY] = ccw_device_nop,
1220 [DEV_STATE_SENSE_PGID] = {
1221 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1222 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1223 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1224 [DEV_EVENT_VERIFY] = ccw_device_nop,
1226 [DEV_STATE_SENSE_ID] = {
1227 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1228 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1229 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1230 [DEV_EVENT_VERIFY] = ccw_device_nop,
1232 [DEV_STATE_OFFLINE] = {
1233 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1234 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1235 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1236 [DEV_EVENT_VERIFY] = ccw_device_nop,
1238 [DEV_STATE_VERIFY] = {
1239 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1240 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1241 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1242 [DEV_EVENT_VERIFY] = ccw_device_nop,
1244 [DEV_STATE_ONLINE] = {
1245 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1246 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1247 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1248 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1250 [DEV_STATE_W4SENSE] = {
1251 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1252 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1253 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1254 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1256 [DEV_STATE_DISBAND_PGID] = {
1257 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1258 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1259 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1260 [DEV_EVENT_VERIFY] = ccw_device_nop,
1262 [DEV_STATE_BOXED] = {
1263 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1264 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1265 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1266 [DEV_EVENT_VERIFY] = ccw_device_nop,
1268 /* states to wait for i/o completion before doing something */
1269 [DEV_STATE_CLEAR_VERIFY] = {
1270 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1271 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1272 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1273 [DEV_EVENT_VERIFY] = ccw_device_nop,
1275 [DEV_STATE_TIMEOUT_KILL] = {
1276 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1277 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1278 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1279 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1281 [DEV_STATE_WAIT4IO] = {
1282 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1283 [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq,
1284 [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout,
1285 [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify,
1287 [DEV_STATE_QUIESCE] = {
1288 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1289 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1290 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1291 [DEV_EVENT_VERIFY] = ccw_device_nop,
1293 /* special states for devices gone not operational */
1294 [DEV_STATE_DISCONNECTED] = {
1295 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1296 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1297 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
1298 [DEV_EVENT_VERIFY] = ccw_device_nop,
1300 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1301 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1302 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1303 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1304 [DEV_EVENT_VERIFY] = ccw_device_nop,
1306 [DEV_STATE_CMFCHANGE] = {
1307 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1308 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1309 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1310 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1312 [DEV_STATE_CMFUPDATE] = {
1313 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1314 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1315 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1316 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1321 * io_subchannel_irq is called for "real" interrupts or for status
1322 * pending conditions on msch.
1325 io_subchannel_irq (struct device *pdev)
1327 struct ccw_device *cdev;
1329 cdev = to_subchannel(pdev)->dev.driver_data;
1331 CIO_TRACE_EVENT (3, "IRQ");
1332 CIO_TRACE_EVENT (3, pdev->bus_id);
1334 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1337 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);