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(cohuck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #include <linux/module.h>
12 #include <linux/config.h>
13 #include <linux/init.h>
15 #include <asm/ccwdev.h>
19 #include "cio_debug.h"
26 device_is_online(struct subchannel *sch)
28 struct ccw_device *cdev;
30 if (!sch->dev.driver_data)
32 cdev = sch->dev.driver_data;
33 return (cdev->private->state == DEV_STATE_ONLINE);
37 device_is_disconnected(struct subchannel *sch)
39 struct ccw_device *cdev;
41 if (!sch->dev.driver_data)
43 cdev = sch->dev.driver_data;
44 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
45 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
49 device_set_disconnected(struct subchannel *sch)
51 struct ccw_device *cdev;
53 if (!sch->dev.driver_data)
55 cdev = sch->dev.driver_data;
56 ccw_device_set_timeout(cdev, 0);
57 cdev->private->flags.fake_irb = 0;
58 cdev->private->state = DEV_STATE_DISCONNECTED;
62 device_set_waiting(struct subchannel *sch)
64 struct ccw_device *cdev;
66 if (!sch->dev.driver_data)
68 cdev = sch->dev.driver_data;
69 ccw_device_set_timeout(cdev, 10*HZ);
70 cdev->private->state = DEV_STATE_WAIT4IO;
74 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
77 ccw_device_timeout(unsigned long data)
79 struct ccw_device *cdev;
81 cdev = (struct ccw_device *) data;
82 spin_lock_irq(cdev->ccwlock);
83 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
84 spin_unlock_irq(cdev->ccwlock);
91 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
94 del_timer(&cdev->private->timer);
97 if (timer_pending(&cdev->private->timer)) {
98 if (mod_timer(&cdev->private->timer, jiffies + expires))
101 cdev->private->timer.function = ccw_device_timeout;
102 cdev->private->timer.data = (unsigned long) cdev;
103 cdev->private->timer.expires = jiffies + expires;
104 add_timer(&cdev->private->timer);
107 /* Kill any pending timers after machine check. */
109 device_kill_pending_timer(struct subchannel *sch)
111 struct ccw_device *cdev;
113 if (!sch->dev.driver_data)
115 cdev = sch->dev.driver_data;
116 ccw_device_set_timeout(cdev, 0);
120 * Cancel running i/o. This is called repeatedly since halt/clear are
121 * asynchronous operations. We do one try with cio_cancel, two tries
122 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
123 * Returns 0 if device now idle, -ENODEV for device not operational and
124 * -EBUSY if an interrupt is expected (either from halt/clear or from a
128 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
130 struct subchannel *sch;
133 sch = to_subchannel(cdev->dev.parent);
134 ret = stsch(sch->irq, &sch->schib);
135 if (ret || !sch->schib.pmcw.dnv)
137 if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
138 /* Not operational or no activity -> done. */
140 /* Stage 1: cancel io. */
141 if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
142 !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
143 ret = cio_cancel(sch);
146 /* cancel io unsuccessful. From now on it is asynchronous. */
147 cdev->private->iretry = 3; /* 3 halt retries. */
149 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
150 /* Stage 2: halt io. */
151 if (cdev->private->iretry) {
152 cdev->private->iretry--;
154 return (ret == 0) ? -EBUSY : ret;
156 /* halt io unsuccessful. */
157 cdev->private->iretry = 255; /* 255 clear retries. */
159 /* Stage 3: clear io. */
160 if (cdev->private->iretry) {
161 cdev->private->iretry--;
162 ret = cio_clear (sch);
163 return (ret == 0) ? -EBUSY : ret;
165 panic("Can't stop i/o on subchannel.\n");
169 ccw_device_handle_oper(struct ccw_device *cdev)
171 struct subchannel *sch;
173 sch = to_subchannel(cdev->dev.parent);
174 cdev->private->flags.recog_done = 1;
176 * Check if cu type and device type still match. If
177 * not, it is certainly another device and we have to
178 * de- and re-register. Also check here for non-matching devno.
180 if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
181 cdev->id.cu_model != cdev->private->senseid.cu_model ||
182 cdev->id.dev_type != cdev->private->senseid.dev_type ||
183 cdev->id.dev_model != cdev->private->senseid.dev_model ||
184 cdev->private->devno != sch->schib.pmcw.dev) {
185 PREPARE_WORK(&cdev->private->kick_work,
186 ccw_device_do_unreg_rereg, (void *)cdev);
187 queue_work(ccw_device_work, &cdev->private->kick_work);
190 cdev->private->flags.donotify = 1;
195 * The machine won't give us any notification by machine check if a chpid has
196 * been varied online on the SE so we have to find out by magic (i. e. driving
197 * the channel subsystem to device selection and updating our path masks).
200 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
204 for (i = 0; i<8; i++) {
206 if (!(sch->lpm & mask))
210 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
215 * Stop device recognition.
218 ccw_device_recog_done(struct ccw_device *cdev, int state)
220 struct subchannel *sch;
221 int notify, old_lpm, same_dev;
223 sch = to_subchannel(cdev->dev.parent);
225 ccw_device_set_timeout(cdev, 0);
226 cio_disable_subchannel(sch);
228 * Now that we tried recognition, we have performed device selection
229 * through ssch() and the path information is up to date.
232 stsch(sch->irq, &sch->schib);
233 sch->lpm = sch->schib.pmcw.pim &
234 sch->schib.pmcw.pam &
235 sch->schib.pmcw.pom &
237 /* Check since device may again have become not operational. */
238 if (!sch->schib.pmcw.dnv)
239 state = DEV_STATE_NOT_OPER;
240 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
241 /* Force reprobe on all chpids. */
243 if (sch->lpm != old_lpm)
244 __recover_lost_chpids(sch, old_lpm);
245 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
246 if (state == DEV_STATE_NOT_OPER) {
247 cdev->private->flags.recog_done = 1;
248 cdev->private->state = DEV_STATE_DISCONNECTED;
251 /* Boxed devices don't need extra treatment. */
254 same_dev = 0; /* Keep the compiler quiet... */
256 case DEV_STATE_NOT_OPER:
257 CIO_DEBUG(KERN_WARNING, 2,
258 "SenseID : unknown device %04x on subchannel %04x\n",
259 cdev->private->devno, sch->irq);
261 case DEV_STATE_OFFLINE:
262 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
263 same_dev = ccw_device_handle_oper(cdev);
266 /* fill out sense information */
267 cdev->id = (struct ccw_device_id) {
268 .cu_type = cdev->private->senseid.cu_type,
269 .cu_model = cdev->private->senseid.cu_model,
270 .dev_type = cdev->private->senseid.dev_type,
271 .dev_model = cdev->private->senseid.dev_model,
274 cdev->private->state = DEV_STATE_OFFLINE;
276 /* Get device online again. */
277 ccw_device_online(cdev);
278 wake_up(&cdev->private->wait_q);
282 /* Issue device info message. */
283 CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: "
284 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
285 "%04X/%02X\n", cdev->private->devno,
286 cdev->id.cu_type, cdev->id.cu_model,
287 cdev->id.dev_type, cdev->id.dev_model);
289 case DEV_STATE_BOXED:
290 CIO_DEBUG(KERN_WARNING, 2,
291 "SenseID : boxed device %04x on subchannel %04x\n",
292 cdev->private->devno, sch->irq);
295 cdev->private->state = state;
296 io_subchannel_recog_done(cdev);
297 if (state != DEV_STATE_NOT_OPER)
298 wake_up(&cdev->private->wait_q);
302 * Function called from device_id.c after sense id has completed.
305 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
309 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
311 case -ETIME: /* Sense id stopped by timeout. */
312 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
315 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
321 ccw_device_oper_notify(void *data)
323 struct ccw_device *cdev;
324 struct subchannel *sch;
327 cdev = (struct ccw_device *)data;
328 sch = to_subchannel(cdev->dev.parent);
329 ret = (sch->driver && sch->driver->notify) ?
330 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
332 /* Driver doesn't want device back. */
333 ccw_device_do_unreg_rereg((void *)cdev);
335 wake_up(&cdev->private->wait_q);
339 * Finished with online/offline processing.
342 ccw_device_done(struct ccw_device *cdev, int state)
344 struct subchannel *sch;
346 sch = to_subchannel(cdev->dev.parent);
348 if (state != DEV_STATE_ONLINE)
349 cio_disable_subchannel(sch);
351 /* Reset device status. */
352 memset(&cdev->private->irb, 0, sizeof(struct irb));
354 cdev->private->state = state;
357 if (state == DEV_STATE_BOXED)
358 CIO_DEBUG(KERN_WARNING, 2,
359 "Boxed device %04x on subchannel %04x\n",
360 cdev->private->devno, sch->irq);
362 if (cdev->private->flags.donotify) {
363 cdev->private->flags.donotify = 0;
364 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
366 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
368 wake_up(&cdev->private->wait_q);
370 if (css_init_done && state != DEV_STATE_ONLINE)
371 put_device (&cdev->dev);
375 * Function called from device_pgid.c after sense path ground has completed.
378 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
380 struct subchannel *sch;
382 sch = to_subchannel(cdev->dev.parent);
385 /* Start Path Group verification. */
386 sch->vpm = 0; /* Start with no path groups set. */
387 cdev->private->state = DEV_STATE_VERIFY;
388 ccw_device_verify_start(cdev);
390 case -ETIME: /* Sense path group id stopped by timeout. */
391 case -EUSERS: /* device is reserved for someone else. */
392 ccw_device_done(cdev, DEV_STATE_BOXED);
394 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
395 cdev->private->options.pgroup = 0;
396 ccw_device_done(cdev, DEV_STATE_ONLINE);
399 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
405 * Start device recognition.
408 ccw_device_recognition(struct ccw_device *cdev)
410 struct subchannel *sch;
413 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
414 (cdev->private->state != DEV_STATE_BOXED))
416 sch = to_subchannel(cdev->dev.parent);
417 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
419 /* Couldn't enable the subchannel for i/o. Sick device. */
422 /* After 60s the device recognition is considered to have failed. */
423 ccw_device_set_timeout(cdev, 60*HZ);
426 * We used to start here with a sense pgid to find out whether a device
427 * is locked by someone else. Unfortunately, the sense pgid command
428 * code has other meanings on devices predating the path grouping
429 * algorithm, so we start with sense id and box the device after an
430 * timeout (or if sense pgid during path verification detects the device
431 * is locked, as may happen on newer devices).
433 cdev->private->flags.recog_done = 0;
434 cdev->private->state = DEV_STATE_SENSE_ID;
435 ccw_device_sense_id_start(cdev);
440 * Handle timeout in device recognition.
443 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
447 ret = ccw_device_cancel_halt_clear(cdev);
450 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
453 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
456 ccw_device_set_timeout(cdev, 3*HZ);
462 ccw_device_nopath_notify(void *data)
464 struct ccw_device *cdev;
465 struct subchannel *sch;
468 cdev = (struct ccw_device *)data;
469 sch = to_subchannel(cdev->dev.parent);
473 ret = (sch->driver && sch->driver->notify) ?
474 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
476 if (get_device(&sch->dev)) {
477 /* Driver doesn't want to keep device. */
478 cio_disable_subchannel(sch);
479 if (get_device(&cdev->dev)) {
480 PREPARE_WORK(&cdev->private->kick_work,
481 ccw_device_call_sch_unregister,
483 queue_work(ccw_device_work,
484 &cdev->private->kick_work);
486 put_device(&sch->dev);
489 cio_disable_subchannel(sch);
490 ccw_device_set_timeout(cdev, 0);
491 cdev->private->flags.fake_irb = 0;
492 cdev->private->state = DEV_STATE_DISCONNECTED;
493 wake_up(&cdev->private->wait_q);
498 ccw_device_verify_done(struct ccw_device *cdev, int err)
500 cdev->private->flags.doverify = 0;
502 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
503 cdev->private->options.pgroup = 0;
505 ccw_device_done(cdev, DEV_STATE_ONLINE);
506 /* Deliver fake irb to device driver, if needed. */
507 if (cdev->private->flags.fake_irb) {
508 memset(&cdev->private->irb, 0, sizeof(struct irb));
509 cdev->private->irb.scsw = (struct scsw) {
511 .fctl = SCSW_FCTL_START_FUNC,
512 .actl = SCSW_ACTL_START_PEND,
513 .stctl = SCSW_STCTL_STATUS_PEND,
515 cdev->private->flags.fake_irb = 0;
517 cdev->handler(cdev, cdev->private->intparm,
518 &cdev->private->irb);
519 memset(&cdev->private->irb, 0, sizeof(struct irb));
523 ccw_device_done(cdev, DEV_STATE_BOXED);
526 PREPARE_WORK(&cdev->private->kick_work,
527 ccw_device_nopath_notify, (void *)cdev);
528 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
529 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
538 ccw_device_online(struct ccw_device *cdev)
540 struct subchannel *sch;
543 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
544 (cdev->private->state != DEV_STATE_BOXED))
546 sch = to_subchannel(cdev->dev.parent);
547 if (css_init_done && !get_device(&cdev->dev))
549 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
551 /* Couldn't enable the subchannel for i/o. Sick device. */
553 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
556 /* Do we want to do path grouping? */
557 if (!cdev->private->options.pgroup) {
558 /* No, set state online immediately. */
559 ccw_device_done(cdev, DEV_STATE_ONLINE);
562 /* Do a SensePGID first. */
563 cdev->private->state = DEV_STATE_SENSE_PGID;
564 ccw_device_sense_pgid_start(cdev);
569 ccw_device_disband_done(struct ccw_device *cdev, int err)
573 ccw_device_done(cdev, DEV_STATE_OFFLINE);
576 ccw_device_done(cdev, DEV_STATE_BOXED);
579 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
588 ccw_device_offline(struct ccw_device *cdev)
590 struct subchannel *sch;
592 sch = to_subchannel(cdev->dev.parent);
593 if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv)
595 if (cdev->private->state != DEV_STATE_ONLINE) {
596 if (sch->schib.scsw.actl != 0)
600 if (sch->schib.scsw.actl != 0)
602 /* Are we doing path grouping? */
603 if (!cdev->private->options.pgroup) {
604 /* No, set state offline immediately. */
605 ccw_device_done(cdev, DEV_STATE_OFFLINE);
608 /* Start Set Path Group commands. */
609 cdev->private->state = DEV_STATE_DISBAND_PGID;
610 ccw_device_disband_start(cdev);
615 * Handle timeout in device online/offline process.
618 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
622 ret = ccw_device_cancel_halt_clear(cdev);
625 ccw_device_done(cdev, DEV_STATE_BOXED);
628 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
631 ccw_device_set_timeout(cdev, 3*HZ);
636 * Handle not oper event in device recognition.
639 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
641 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
645 * Handle not operational event while offline.
648 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
650 struct subchannel *sch;
652 cdev->private->state = DEV_STATE_NOT_OPER;
653 sch = to_subchannel(cdev->dev.parent);
654 if (get_device(&cdev->dev)) {
655 PREPARE_WORK(&cdev->private->kick_work,
656 ccw_device_call_sch_unregister, (void *)cdev);
657 queue_work(ccw_device_work, &cdev->private->kick_work);
659 wake_up(&cdev->private->wait_q);
663 * Handle not operational event while online.
666 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
668 struct subchannel *sch;
670 sch = to_subchannel(cdev->dev.parent);
671 if (sch->driver->notify &&
672 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
673 ccw_device_set_timeout(cdev, 0);
674 cdev->private->flags.fake_irb = 0;
675 cdev->private->state = DEV_STATE_DISCONNECTED;
676 wake_up(&cdev->private->wait_q);
679 cdev->private->state = DEV_STATE_NOT_OPER;
680 cio_disable_subchannel(sch);
681 if (sch->schib.scsw.actl != 0) {
682 // FIXME: not-oper indication to device driver ?
683 ccw_device_call_handler(cdev);
685 if (get_device(&cdev->dev)) {
686 PREPARE_WORK(&cdev->private->kick_work,
687 ccw_device_call_sch_unregister, (void *)cdev);
688 queue_work(ccw_device_work, &cdev->private->kick_work);
690 wake_up(&cdev->private->wait_q);
694 * Handle path verification event.
697 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
699 struct subchannel *sch;
701 if (!cdev->private->options.pgroup)
703 if (cdev->private->state == DEV_STATE_W4SENSE) {
704 cdev->private->flags.doverify = 1;
707 sch = to_subchannel(cdev->dev.parent);
709 * Since we might not just be coming from an interrupt from the
710 * subchannel we have to update the schib.
712 stsch(sch->irq, &sch->schib);
714 if (sch->schib.scsw.actl != 0 ||
715 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
717 * No final status yet or final status not yet delivered
718 * to the device driver. Can't do path verfication now,
719 * delay until final status was delivered.
721 cdev->private->flags.doverify = 1;
724 /* Device is idle, we can do the path verification. */
725 cdev->private->state = DEV_STATE_VERIFY;
726 ccw_device_verify_start(cdev);
730 * Got an interrupt for a normal io (state online).
733 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
737 irb = (struct irb *) __LC_IRB;
738 /* Check for unsolicited interrupt. */
739 if ((irb->scsw.stctl ==
740 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
741 && (!irb->scsw.cc)) {
742 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
743 !irb->esw.esw0.erw.cons) {
744 /* Unit check but no sense data. Need basic sense. */
745 if (ccw_device_do_sense(cdev, irb) != 0)
746 goto call_handler_unsol;
747 memcpy(irb, &cdev->private->irb, sizeof(struct irb));
748 cdev->private->state = DEV_STATE_W4SENSE;
749 cdev->private->intparm = 0;
754 cdev->handler (cdev, 0, irb);
757 /* Accumulate status and find out if a basic sense is needed. */
758 ccw_device_accumulate_irb(cdev, irb);
759 if (cdev->private->flags.dosense) {
760 if (ccw_device_do_sense(cdev, irb) == 0) {
761 cdev->private->state = DEV_STATE_W4SENSE;
765 /* Call the handler. */
766 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
767 /* Start delayed path verification. */
768 ccw_device_online_verify(cdev, 0);
772 * Got an timeout in online state.
775 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
779 ccw_device_set_timeout(cdev, 0);
780 ret = ccw_device_cancel_halt_clear(cdev);
782 ccw_device_set_timeout(cdev, 3*HZ);
783 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
786 if (ret == -ENODEV) {
787 struct subchannel *sch;
789 sch = to_subchannel(cdev->dev.parent);
791 PREPARE_WORK(&cdev->private->kick_work,
792 ccw_device_nopath_notify, (void *)cdev);
793 queue_work(ccw_device_notify_work,
794 &cdev->private->kick_work);
796 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
797 } else if (cdev->handler)
798 cdev->handler(cdev, cdev->private->intparm,
799 ERR_PTR(-ETIMEDOUT));
803 * Got an interrupt for a basic sense.
806 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
810 irb = (struct irb *) __LC_IRB;
811 /* Check for unsolicited interrupt. */
812 if (irb->scsw.stctl ==
813 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
814 if (irb->scsw.cc == 1)
815 /* Basic sense hasn't started. Try again. */
816 ccw_device_do_sense(cdev, irb);
818 printk("Huh? %s(%s): unsolicited interrupt...\n",
819 __FUNCTION__, cdev->dev.bus_id);
821 cdev->handler (cdev, 0, irb);
825 /* Add basic sense info to irb. */
826 ccw_device_accumulate_basic_sense(cdev, irb);
827 if (cdev->private->flags.dosense) {
828 /* Another basic sense is needed. */
829 ccw_device_do_sense(cdev, irb);
832 cdev->private->state = DEV_STATE_ONLINE;
833 /* Call the handler. */
834 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
835 /* Start delayed path verification. */
836 ccw_device_online_verify(cdev, 0);
840 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
844 irb = (struct irb *) __LC_IRB;
845 /* Accumulate status. We don't do basic sense. */
846 ccw_device_accumulate_irb(cdev, irb);
847 /* Try to start delayed device verification. */
848 ccw_device_online_verify(cdev, 0);
849 /* Note: Don't call handler for cio initiated clear! */
853 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
855 struct subchannel *sch;
857 sch = to_subchannel(cdev->dev.parent);
858 ccw_device_set_timeout(cdev, 0);
859 /* OK, i/o is dead now. Call interrupt handler. */
860 cdev->private->state = DEV_STATE_ONLINE;
862 cdev->handler(cdev, cdev->private->intparm,
863 ERR_PTR(-ETIMEDOUT));
865 PREPARE_WORK(&cdev->private->kick_work,
866 ccw_device_nopath_notify, (void *)cdev);
867 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
868 } else if (cdev->private->flags.doverify)
869 /* Start delayed path verification. */
870 ccw_device_online_verify(cdev, 0);
874 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
878 ret = ccw_device_cancel_halt_clear(cdev);
880 ccw_device_set_timeout(cdev, 3*HZ);
883 if (ret == -ENODEV) {
884 struct subchannel *sch;
886 sch = to_subchannel(cdev->dev.parent);
888 PREPARE_WORK(&cdev->private->kick_work,
889 ccw_device_nopath_notify, (void *)cdev);
890 queue_work(ccw_device_notify_work,
891 &cdev->private->kick_work);
893 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
896 //FIXME: Can we get here?
897 cdev->private->state = DEV_STATE_ONLINE;
899 cdev->handler(cdev, cdev->private->intparm,
900 ERR_PTR(-ETIMEDOUT));
904 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
907 struct subchannel *sch;
909 irb = (struct irb *) __LC_IRB;
911 * Accumulate status and find out if a basic sense is needed.
912 * This is fine since we have already adapted the lpm.
914 ccw_device_accumulate_irb(cdev, irb);
915 if (cdev->private->flags.dosense) {
916 if (ccw_device_do_sense(cdev, irb) == 0) {
917 cdev->private->state = DEV_STATE_W4SENSE;
922 /* Iff device is idle, reset timeout. */
923 sch = to_subchannel(cdev->dev.parent);
924 if (!stsch(sch->irq, &sch->schib))
925 if (sch->schib.scsw.actl == 0)
926 ccw_device_set_timeout(cdev, 0);
927 /* Call the handler. */
928 ccw_device_call_handler(cdev);
930 PREPARE_WORK(&cdev->private->kick_work,
931 ccw_device_nopath_notify, (void *)cdev);
932 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
933 } else if (cdev->private->flags.doverify)
934 ccw_device_online_verify(cdev, 0);
938 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
941 struct subchannel *sch;
943 sch = to_subchannel(cdev->dev.parent);
944 ccw_device_set_timeout(cdev, 0);
945 ret = ccw_device_cancel_halt_clear(cdev);
947 ccw_device_set_timeout(cdev, 3*HZ);
948 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
951 if (ret == -ENODEV) {
953 PREPARE_WORK(&cdev->private->kick_work,
954 ccw_device_nopath_notify, (void *)cdev);
955 queue_work(ccw_device_notify_work,
956 &cdev->private->kick_work);
958 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
962 cdev->handler(cdev, cdev->private->intparm,
963 ERR_PTR(-ETIMEDOUT));
965 PREPARE_WORK(&cdev->private->kick_work,
966 ccw_device_nopath_notify, (void *)cdev);
967 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
968 } else if (cdev->private->flags.doverify)
969 /* Start delayed path verification. */
970 ccw_device_online_verify(cdev, 0);
974 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
976 /* When the I/O has terminated, we have to start verification. */
977 if (cdev->private->options.pgroup)
978 cdev->private->flags.doverify = 1;
982 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
987 case DEV_EVENT_INTERRUPT:
988 irb = (struct irb *) __LC_IRB;
989 /* Check for unsolicited interrupt. */
990 if ((irb->scsw.stctl ==
991 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
993 /* FIXME: we should restart stlck here, but this
994 * is extremely unlikely ... */
997 ccw_device_accumulate_irb(cdev, irb);
998 /* We don't care about basic sense etc. */
1000 default: /* timeout */
1004 wake_up(&cdev->private->wait_q);
1008 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1010 struct subchannel *sch;
1012 sch = to_subchannel(cdev->dev.parent);
1013 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1014 /* Couldn't enable the subchannel for i/o. Sick device. */
1017 /* After 60s the device recognition is considered to have failed. */
1018 ccw_device_set_timeout(cdev, 60*HZ);
1020 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1021 ccw_device_sense_id_start(cdev);
1025 device_trigger_reprobe(struct subchannel *sch)
1027 struct ccw_device *cdev;
1029 if (!sch->dev.driver_data)
1031 cdev = sch->dev.driver_data;
1032 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1035 /* Update some values. */
1036 if (stsch(sch->irq, &sch->schib))
1040 * The pim, pam, pom values may not be accurate, but they are the best
1041 * we have before performing device selection :/
1043 sch->lpm = sch->schib.pmcw.pim &
1044 sch->schib.pmcw.pam &
1045 sch->schib.pmcw.pom &
1047 /* Re-set some bits in the pmcw that were lost. */
1048 sch->schib.pmcw.isc = 3;
1049 sch->schib.pmcw.csense = 1;
1050 sch->schib.pmcw.ena = 0;
1051 if ((sch->lpm & (sch->lpm - 1)) != 0)
1052 sch->schib.pmcw.mp = 1;
1053 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1054 /* We should also udate ssd info, but this has to wait. */
1055 ccw_device_start_id(cdev, 0);
1059 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1061 struct subchannel *sch;
1063 sch = to_subchannel(cdev->dev.parent);
1065 * An interrupt in state offline means a previous disable was not
1066 * successful. Try again.
1068 cio_disable_subchannel(sch);
1072 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1074 retry_set_schib(cdev);
1075 cdev->private->state = DEV_STATE_ONLINE;
1076 dev_fsm_event(cdev, dev_event);
1081 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1083 ccw_device_set_timeout(cdev, 0);
1084 if (dev_event == DEV_EVENT_NOTOPER)
1085 cdev->private->state = DEV_STATE_NOT_OPER;
1087 cdev->private->state = DEV_STATE_OFFLINE;
1088 wake_up(&cdev->private->wait_q);
1092 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1096 ret = ccw_device_cancel_halt_clear(cdev);
1099 cdev->private->state = DEV_STATE_OFFLINE;
1100 wake_up(&cdev->private->wait_q);
1103 cdev->private->state = DEV_STATE_NOT_OPER;
1104 wake_up(&cdev->private->wait_q);
1107 ccw_device_set_timeout(cdev, HZ/10);
1112 * No operation action. This is used e.g. to ignore a timeout event in
1116 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1121 * Bug operation action.
1124 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1126 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1127 cdev->private->state, dev_event);
1132 * device statemachine
1134 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1135 [DEV_STATE_NOT_OPER] = {
1136 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1137 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1138 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1139 [DEV_EVENT_VERIFY] = ccw_device_nop,
1141 [DEV_STATE_SENSE_PGID] = {
1142 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1143 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1144 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1145 [DEV_EVENT_VERIFY] = ccw_device_nop,
1147 [DEV_STATE_SENSE_ID] = {
1148 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1149 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1150 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1151 [DEV_EVENT_VERIFY] = ccw_device_nop,
1153 [DEV_STATE_OFFLINE] = {
1154 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1155 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1156 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1157 [DEV_EVENT_VERIFY] = ccw_device_nop,
1159 [DEV_STATE_VERIFY] = {
1160 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1161 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1162 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1163 [DEV_EVENT_VERIFY] = ccw_device_nop,
1165 [DEV_STATE_ONLINE] = {
1166 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1167 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1168 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1169 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1171 [DEV_STATE_W4SENSE] = {
1172 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1173 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1174 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1175 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1177 [DEV_STATE_DISBAND_PGID] = {
1178 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1179 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1180 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1181 [DEV_EVENT_VERIFY] = ccw_device_nop,
1183 [DEV_STATE_BOXED] = {
1184 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1185 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1186 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1187 [DEV_EVENT_VERIFY] = ccw_device_nop,
1189 /* states to wait for i/o completion before doing something */
1190 [DEV_STATE_CLEAR_VERIFY] = {
1191 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1192 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1193 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1194 [DEV_EVENT_VERIFY] = ccw_device_nop,
1196 [DEV_STATE_TIMEOUT_KILL] = {
1197 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1198 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1199 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1200 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1202 [DEV_STATE_WAIT4IO] = {
1203 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1204 [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq,
1205 [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout,
1206 [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify,
1208 [DEV_STATE_QUIESCE] = {
1209 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1210 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1211 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1212 [DEV_EVENT_VERIFY] = ccw_device_nop,
1214 /* special states for devices gone not operational */
1215 [DEV_STATE_DISCONNECTED] = {
1216 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1217 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1218 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
1219 [DEV_EVENT_VERIFY] = ccw_device_nop,
1221 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1222 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1223 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1224 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1225 [DEV_EVENT_VERIFY] = ccw_device_nop,
1227 [DEV_STATE_CMFCHANGE] = {
1228 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1229 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1230 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1231 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1236 * io_subchannel_irq is called for "real" interrupts or for status
1237 * pending conditions on msch.
1240 io_subchannel_irq (struct device *pdev)
1242 struct ccw_device *cdev;
1244 cdev = to_subchannel(pdev)->dev.driver_data;
1246 CIO_TRACE_EVENT (3, "IRQ");
1247 CIO_TRACE_EVENT (3, pdev->bus_id);
1249 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1252 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);