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>
18 #include <asm/chpid.h>
21 #include "cio_debug.h"
29 device_is_online(struct subchannel *sch)
31 struct ccw_device *cdev;
33 if (!sch->dev.driver_data)
35 cdev = sch->dev.driver_data;
36 return (cdev->private->state == DEV_STATE_ONLINE);
40 device_is_disconnected(struct subchannel *sch)
42 struct ccw_device *cdev;
44 if (!sch->dev.driver_data)
46 cdev = sch->dev.driver_data;
47 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
48 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
52 device_set_disconnected(struct subchannel *sch)
54 struct ccw_device *cdev;
56 if (!sch->dev.driver_data)
58 cdev = sch->dev.driver_data;
59 ccw_device_set_timeout(cdev, 0);
60 cdev->private->flags.fake_irb = 0;
61 cdev->private->state = DEV_STATE_DISCONNECTED;
64 void device_set_intretry(struct subchannel *sch)
66 struct ccw_device *cdev;
68 cdev = sch->dev.driver_data;
71 cdev->private->flags.intretry = 1;
74 int device_trigger_verify(struct subchannel *sch)
76 struct ccw_device *cdev;
78 cdev = sch->dev.driver_data;
79 if (!cdev || !cdev->online)
81 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
86 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
89 ccw_device_timeout(unsigned long data)
91 struct ccw_device *cdev;
93 cdev = (struct ccw_device *) data;
94 spin_lock_irq(cdev->ccwlock);
95 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
96 spin_unlock_irq(cdev->ccwlock);
103 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
106 del_timer(&cdev->private->timer);
109 if (timer_pending(&cdev->private->timer)) {
110 if (mod_timer(&cdev->private->timer, jiffies + expires))
113 cdev->private->timer.function = ccw_device_timeout;
114 cdev->private->timer.data = (unsigned long) cdev;
115 cdev->private->timer.expires = jiffies + expires;
116 add_timer(&cdev->private->timer);
119 /* Kill any pending timers after machine check. */
121 device_kill_pending_timer(struct subchannel *sch)
123 struct ccw_device *cdev;
125 if (!sch->dev.driver_data)
127 cdev = sch->dev.driver_data;
128 ccw_device_set_timeout(cdev, 0);
132 * Cancel running i/o. This is called repeatedly since halt/clear are
133 * asynchronous operations. We do one try with cio_cancel, two tries
134 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
135 * Returns 0 if device now idle, -ENODEV for device not operational and
136 * -EBUSY if an interrupt is expected (either from halt/clear or from a
140 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
142 struct subchannel *sch;
145 sch = to_subchannel(cdev->dev.parent);
146 ret = stsch(sch->schid, &sch->schib);
147 if (ret || !sch->schib.pmcw.dnv)
149 if (!sch->schib.pmcw.ena)
150 /* Not operational -> done. */
152 /* Stage 1: cancel io. */
153 if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
154 !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
155 ret = cio_cancel(sch);
158 /* cancel io unsuccessful. From now on it is asynchronous. */
159 cdev->private->iretry = 3; /* 3 halt retries. */
161 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
162 /* Stage 2: halt io. */
163 if (cdev->private->iretry) {
164 cdev->private->iretry--;
167 return (ret == 0) ? -EBUSY : ret;
169 /* halt io unsuccessful. */
170 cdev->private->iretry = 255; /* 255 clear retries. */
172 /* Stage 3: clear io. */
173 if (cdev->private->iretry) {
174 cdev->private->iretry--;
175 ret = cio_clear (sch);
176 return (ret == 0) ? -EBUSY : ret;
178 panic("Can't stop i/o on subchannel.\n");
182 ccw_device_handle_oper(struct ccw_device *cdev)
184 struct subchannel *sch;
186 sch = to_subchannel(cdev->dev.parent);
187 cdev->private->flags.recog_done = 1;
189 * Check if cu type and device type still match. If
190 * not, it is certainly another device and we have to
191 * de- and re-register.
193 if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
194 cdev->id.cu_model != cdev->private->senseid.cu_model ||
195 cdev->id.dev_type != cdev->private->senseid.dev_type ||
196 cdev->id.dev_model != cdev->private->senseid.dev_model) {
197 PREPARE_WORK(&cdev->private->kick_work,
198 ccw_device_do_unreg_rereg);
199 queue_work(ccw_device_work, &cdev->private->kick_work);
202 cdev->private->flags.donotify = 1;
207 * The machine won't give us any notification by machine check if a chpid has
208 * been varied online on the SE so we have to find out by magic (i. e. driving
209 * the channel subsystem to device selection and updating our path masks).
212 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
218 for (i = 0; i<8; i++) {
220 if (!(sch->lpm & mask))
224 chpid.id = sch->schib.pmcw.chpid[i];
225 if (!chp_is_registered(chpid))
226 css_schedule_eval_all();
231 * Stop device recognition.
234 ccw_device_recog_done(struct ccw_device *cdev, int state)
236 struct subchannel *sch;
237 int notify, old_lpm, same_dev;
239 sch = to_subchannel(cdev->dev.parent);
241 ccw_device_set_timeout(cdev, 0);
242 cio_disable_subchannel(sch);
244 * Now that we tried recognition, we have performed device selection
245 * through ssch() and the path information is up to date.
248 stsch(sch->schid, &sch->schib);
249 sch->lpm = sch->schib.pmcw.pam & sch->opm;
250 /* Check since device may again have become not operational. */
251 if (!sch->schib.pmcw.dnv)
252 state = DEV_STATE_NOT_OPER;
253 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
254 /* Force reprobe on all chpids. */
256 if (sch->lpm != old_lpm)
257 __recover_lost_chpids(sch, old_lpm);
258 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
259 if (state == DEV_STATE_NOT_OPER) {
260 cdev->private->flags.recog_done = 1;
261 cdev->private->state = DEV_STATE_DISCONNECTED;
264 /* Boxed devices don't need extra treatment. */
267 same_dev = 0; /* Keep the compiler quiet... */
269 case DEV_STATE_NOT_OPER:
270 CIO_DEBUG(KERN_WARNING, 2,
271 "cio: SenseID : unknown device %04x on subchannel "
272 "0.%x.%04x\n", cdev->private->dev_id.devno,
273 sch->schid.ssid, sch->schid.sch_no);
275 case DEV_STATE_OFFLINE:
276 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
277 same_dev = ccw_device_handle_oper(cdev);
280 /* fill out sense information */
281 memset(&cdev->id, 0, sizeof(cdev->id));
282 cdev->id.cu_type = cdev->private->senseid.cu_type;
283 cdev->id.cu_model = cdev->private->senseid.cu_model;
284 cdev->id.dev_type = cdev->private->senseid.dev_type;
285 cdev->id.dev_model = cdev->private->senseid.dev_model;
287 cdev->private->state = DEV_STATE_OFFLINE;
289 /* Get device online again. */
290 ccw_device_online(cdev);
291 wake_up(&cdev->private->wait_q);
295 /* Issue device info message. */
296 CIO_DEBUG(KERN_INFO, 2,
297 "cio: SenseID : device 0.%x.%04x reports: "
298 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
300 cdev->private->dev_id.ssid,
301 cdev->private->dev_id.devno,
302 cdev->id.cu_type, cdev->id.cu_model,
303 cdev->id.dev_type, cdev->id.dev_model);
305 case DEV_STATE_BOXED:
306 CIO_DEBUG(KERN_WARNING, 2,
307 "cio: SenseID : boxed device %04x on subchannel "
308 "0.%x.%04x\n", cdev->private->dev_id.devno,
309 sch->schid.ssid, sch->schid.sch_no);
312 cdev->private->state = state;
313 io_subchannel_recog_done(cdev);
314 if (state != DEV_STATE_NOT_OPER)
315 wake_up(&cdev->private->wait_q);
319 * Function called from device_id.c after sense id has completed.
322 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
326 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
328 case -ETIME: /* Sense id stopped by timeout. */
329 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
332 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
338 ccw_device_oper_notify(struct work_struct *work)
340 struct ccw_device_private *priv;
341 struct ccw_device *cdev;
342 struct subchannel *sch;
346 priv = container_of(work, struct ccw_device_private, kick_work);
348 spin_lock_irqsave(cdev->ccwlock, flags);
349 sch = to_subchannel(cdev->dev.parent);
350 if (sch->driver && sch->driver->notify) {
351 spin_unlock_irqrestore(cdev->ccwlock, flags);
352 ret = sch->driver->notify(&sch->dev, CIO_OPER);
353 spin_lock_irqsave(cdev->ccwlock, flags);
357 /* Reenable channel measurements, if needed. */
358 spin_unlock_irqrestore(cdev->ccwlock, flags);
360 spin_lock_irqsave(cdev->ccwlock, flags);
361 wake_up(&cdev->private->wait_q);
363 spin_unlock_irqrestore(cdev->ccwlock, flags);
365 /* Driver doesn't want device back. */
366 ccw_device_do_unreg_rereg(work);
370 * Finished with online/offline processing.
373 ccw_device_done(struct ccw_device *cdev, int state)
375 struct subchannel *sch;
377 sch = to_subchannel(cdev->dev.parent);
379 ccw_device_set_timeout(cdev, 0);
381 if (state != DEV_STATE_ONLINE)
382 cio_disable_subchannel(sch);
384 /* Reset device status. */
385 memset(&cdev->private->irb, 0, sizeof(struct irb));
387 cdev->private->state = state;
390 if (state == DEV_STATE_BOXED)
391 CIO_DEBUG(KERN_WARNING, 2,
392 "cio: Boxed device %04x on subchannel %04x\n",
393 cdev->private->dev_id.devno, sch->schid.sch_no);
395 if (cdev->private->flags.donotify) {
396 cdev->private->flags.donotify = 0;
397 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
398 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
400 wake_up(&cdev->private->wait_q);
402 if (css_init_done && state != DEV_STATE_ONLINE)
403 put_device (&cdev->dev);
406 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
414 return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
417 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
423 for (i = 0; i < 8; i++) {
424 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
427 if (cdev->private->pgid[last].inf.ps.state1 ==
429 /* First non-zero PGID */
433 if (cmp_pgid(&cdev->private->pgid[i],
434 &cdev->private->pgid[last]) == 0)
435 /* Non-conflicting PGIDs */
438 /* PGID mismatch, can't pathgroup. */
439 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
440 "0.%x.%04x, can't pathgroup\n",
441 cdev->private->dev_id.ssid,
442 cdev->private->dev_id.devno);
443 cdev->private->options.pgroup = 0;
446 if (cdev->private->pgid[last].inf.ps.state1 ==
448 /* No previous pgid found */
449 memcpy(&cdev->private->pgid[0],
450 &channel_subsystems[0]->global_pgid,
451 sizeof(struct pgid));
453 /* Use existing pgid */
454 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
455 sizeof(struct pgid));
459 * Function called from device_pgid.c after sense path ground has completed.
462 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
464 struct subchannel *sch;
466 sch = to_subchannel(cdev->dev.parent);
468 case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
469 cdev->private->options.pgroup = 0;
471 case 0: /* success */
472 case -EACCES: /* partial success, some paths not operational */
473 /* Check if all pgids are equal or 0. */
474 __ccw_device_get_common_pgid(cdev);
476 case -ETIME: /* Sense path group id stopped by timeout. */
477 case -EUSERS: /* device is reserved for someone else. */
478 ccw_device_done(cdev, DEV_STATE_BOXED);
481 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
484 /* Start Path Group verification. */
485 cdev->private->state = DEV_STATE_VERIFY;
486 cdev->private->flags.doverify = 0;
487 ccw_device_verify_start(cdev);
491 * Start device recognition.
494 ccw_device_recognition(struct ccw_device *cdev)
496 struct subchannel *sch;
499 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
500 (cdev->private->state != DEV_STATE_BOXED))
502 sch = to_subchannel(cdev->dev.parent);
503 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
505 /* Couldn't enable the subchannel for i/o. Sick device. */
508 /* After 60s the device recognition is considered to have failed. */
509 ccw_device_set_timeout(cdev, 60*HZ);
512 * We used to start here with a sense pgid to find out whether a device
513 * is locked by someone else. Unfortunately, the sense pgid command
514 * code has other meanings on devices predating the path grouping
515 * algorithm, so we start with sense id and box the device after an
516 * timeout (or if sense pgid during path verification detects the device
517 * is locked, as may happen on newer devices).
519 cdev->private->flags.recog_done = 0;
520 cdev->private->state = DEV_STATE_SENSE_ID;
521 ccw_device_sense_id_start(cdev);
526 * Handle timeout in device recognition.
529 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
533 ret = ccw_device_cancel_halt_clear(cdev);
536 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
539 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
542 ccw_device_set_timeout(cdev, 3*HZ);
548 ccw_device_nopath_notify(struct work_struct *work)
550 struct ccw_device_private *priv;
551 struct ccw_device *cdev;
552 struct subchannel *sch;
556 priv = container_of(work, struct ccw_device_private, kick_work);
558 spin_lock_irqsave(cdev->ccwlock, flags);
559 sch = to_subchannel(cdev->dev.parent);
563 if (sch->driver && sch->driver->notify) {
564 spin_unlock_irqrestore(cdev->ccwlock, flags);
565 ret = sch->driver->notify(&sch->dev, CIO_NO_PATH);
566 spin_lock_irqsave(cdev->ccwlock, flags);
570 if (get_device(&sch->dev)) {
571 /* Driver doesn't want to keep device. */
572 cio_disable_subchannel(sch);
573 if (get_device(&cdev->dev)) {
574 PREPARE_WORK(&cdev->private->kick_work,
575 ccw_device_call_sch_unregister);
576 queue_work(ccw_device_work,
577 &cdev->private->kick_work);
579 put_device(&sch->dev);
582 cio_disable_subchannel(sch);
583 ccw_device_set_timeout(cdev, 0);
584 cdev->private->flags.fake_irb = 0;
585 cdev->private->state = DEV_STATE_DISCONNECTED;
586 wake_up(&cdev->private->wait_q);
589 spin_unlock_irqrestore(cdev->ccwlock, flags);
593 ccw_device_verify_done(struct ccw_device *cdev, int err)
595 struct subchannel *sch;
597 sch = to_subchannel(cdev->dev.parent);
598 /* Update schib - pom may have changed. */
599 stsch(sch->schid, &sch->schib);
600 /* Update lpm with verified path mask. */
602 /* Repeat path verification? */
603 if (cdev->private->flags.doverify) {
604 cdev->private->flags.doverify = 0;
605 ccw_device_verify_start(cdev);
609 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
610 cdev->private->options.pgroup = 0;
612 ccw_device_done(cdev, DEV_STATE_ONLINE);
613 /* Deliver fake irb to device driver, if needed. */
614 if (cdev->private->flags.fake_irb) {
615 memset(&cdev->private->irb, 0, sizeof(struct irb));
616 cdev->private->irb.scsw.cc = 1;
617 cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
618 cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
619 cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
620 cdev->private->flags.fake_irb = 0;
622 cdev->handler(cdev, cdev->private->intparm,
623 &cdev->private->irb);
624 memset(&cdev->private->irb, 0, sizeof(struct irb));
628 /* Reset oper notify indication after verify error. */
629 cdev->private->flags.donotify = 0;
630 ccw_device_done(cdev, DEV_STATE_BOXED);
633 /* Reset oper notify indication after verify error. */
634 cdev->private->flags.donotify = 0;
636 PREPARE_WORK(&cdev->private->kick_work,
637 ccw_device_nopath_notify);
638 queue_work(ccw_device_notify_work,
639 &cdev->private->kick_work);
641 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
650 ccw_device_online(struct ccw_device *cdev)
652 struct subchannel *sch;
655 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
656 (cdev->private->state != DEV_STATE_BOXED))
658 sch = to_subchannel(cdev->dev.parent);
659 if (css_init_done && !get_device(&cdev->dev))
661 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
663 /* Couldn't enable the subchannel for i/o. Sick device. */
665 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
668 /* Do we want to do path grouping? */
669 if (!cdev->private->options.pgroup) {
670 /* Start initial path verification. */
671 cdev->private->state = DEV_STATE_VERIFY;
672 cdev->private->flags.doverify = 0;
673 ccw_device_verify_start(cdev);
676 /* Do a SensePGID first. */
677 cdev->private->state = DEV_STATE_SENSE_PGID;
678 ccw_device_sense_pgid_start(cdev);
683 ccw_device_disband_done(struct ccw_device *cdev, int err)
687 ccw_device_done(cdev, DEV_STATE_OFFLINE);
690 ccw_device_done(cdev, DEV_STATE_BOXED);
693 cdev->private->flags.donotify = 0;
694 if (get_device(&cdev->dev)) {
695 PREPARE_WORK(&cdev->private->kick_work,
696 ccw_device_call_sch_unregister);
697 queue_work(ccw_device_work, &cdev->private->kick_work);
699 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
708 ccw_device_offline(struct ccw_device *cdev)
710 struct subchannel *sch;
712 if (ccw_device_is_orphan(cdev)) {
713 ccw_device_done(cdev, DEV_STATE_OFFLINE);
716 sch = to_subchannel(cdev->dev.parent);
717 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
719 if (cdev->private->state != DEV_STATE_ONLINE) {
720 if (sch->schib.scsw.actl != 0)
724 if (sch->schib.scsw.actl != 0)
726 /* Are we doing path grouping? */
727 if (!cdev->private->options.pgroup) {
728 /* No, set state offline immediately. */
729 ccw_device_done(cdev, DEV_STATE_OFFLINE);
732 /* Start Set Path Group commands. */
733 cdev->private->state = DEV_STATE_DISBAND_PGID;
734 ccw_device_disband_start(cdev);
739 * Handle timeout in device online/offline process.
742 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
746 ret = ccw_device_cancel_halt_clear(cdev);
749 ccw_device_done(cdev, DEV_STATE_BOXED);
752 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
755 ccw_device_set_timeout(cdev, 3*HZ);
760 * Handle not oper event in device recognition.
763 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
765 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
769 * Handle not operational event while offline.
772 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
774 struct subchannel *sch;
776 cdev->private->state = DEV_STATE_NOT_OPER;
777 sch = to_subchannel(cdev->dev.parent);
778 if (get_device(&cdev->dev)) {
779 PREPARE_WORK(&cdev->private->kick_work,
780 ccw_device_call_sch_unregister);
781 queue_work(ccw_device_work, &cdev->private->kick_work);
783 wake_up(&cdev->private->wait_q);
787 * Handle not operational event while online.
790 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
792 struct subchannel *sch;
795 sch = to_subchannel(cdev->dev.parent);
796 if (sch->driver->notify) {
797 spin_unlock_irq(cdev->ccwlock);
798 ret = sch->driver->notify(&sch->dev,
799 sch->lpm ? CIO_GONE : CIO_NO_PATH);
800 spin_lock_irq(cdev->ccwlock);
804 ccw_device_set_timeout(cdev, 0);
805 cdev->private->flags.fake_irb = 0;
806 cdev->private->state = DEV_STATE_DISCONNECTED;
807 wake_up(&cdev->private->wait_q);
810 cdev->private->state = DEV_STATE_NOT_OPER;
811 cio_disable_subchannel(sch);
812 if (sch->schib.scsw.actl != 0) {
813 // FIXME: not-oper indication to device driver ?
814 ccw_device_call_handler(cdev);
816 if (get_device(&cdev->dev)) {
817 PREPARE_WORK(&cdev->private->kick_work,
818 ccw_device_call_sch_unregister);
819 queue_work(ccw_device_work, &cdev->private->kick_work);
821 wake_up(&cdev->private->wait_q);
825 * Handle path verification event.
828 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
830 struct subchannel *sch;
832 if (cdev->private->state == DEV_STATE_W4SENSE) {
833 cdev->private->flags.doverify = 1;
836 sch = to_subchannel(cdev->dev.parent);
838 * Since we might not just be coming from an interrupt from the
839 * subchannel we have to update the schib.
841 stsch(sch->schid, &sch->schib);
843 if (sch->schib.scsw.actl != 0 ||
844 (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
845 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
847 * No final status yet or final status not yet delivered
848 * to the device driver. Can't do path verfication now,
849 * delay until final status was delivered.
851 cdev->private->flags.doverify = 1;
854 /* Device is idle, we can do the path verification. */
855 cdev->private->state = DEV_STATE_VERIFY;
856 cdev->private->flags.doverify = 0;
857 ccw_device_verify_start(cdev);
861 * Got an interrupt for a normal io (state online).
864 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
868 irb = (struct irb *) __LC_IRB;
869 /* Check for unsolicited interrupt. */
870 if ((irb->scsw.stctl ==
871 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
872 && (!irb->scsw.cc)) {
873 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
874 !irb->esw.esw0.erw.cons) {
875 /* Unit check but no sense data. Need basic sense. */
876 if (ccw_device_do_sense(cdev, irb) != 0)
877 goto call_handler_unsol;
878 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
879 cdev->private->state = DEV_STATE_W4SENSE;
880 cdev->private->intparm = 0;
885 cdev->handler (cdev, 0, irb);
886 if (cdev->private->flags.doverify)
887 ccw_device_online_verify(cdev, 0);
890 /* Accumulate status and find out if a basic sense is needed. */
891 ccw_device_accumulate_irb(cdev, irb);
892 if (cdev->private->flags.dosense) {
893 if (ccw_device_do_sense(cdev, irb) == 0) {
894 cdev->private->state = DEV_STATE_W4SENSE;
898 /* Call the handler. */
899 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
900 /* Start delayed path verification. */
901 ccw_device_online_verify(cdev, 0);
905 * Got an timeout in online state.
908 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
912 ccw_device_set_timeout(cdev, 0);
913 ret = ccw_device_cancel_halt_clear(cdev);
915 ccw_device_set_timeout(cdev, 3*HZ);
916 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
919 if (ret == -ENODEV) {
920 struct subchannel *sch;
922 sch = to_subchannel(cdev->dev.parent);
924 PREPARE_WORK(&cdev->private->kick_work,
925 ccw_device_nopath_notify);
926 queue_work(ccw_device_notify_work,
927 &cdev->private->kick_work);
929 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
930 } else if (cdev->handler)
931 cdev->handler(cdev, cdev->private->intparm,
932 ERR_PTR(-ETIMEDOUT));
936 * Got an interrupt for a basic sense.
939 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
943 irb = (struct irb *) __LC_IRB;
944 /* Check for unsolicited interrupt. */
945 if (irb->scsw.stctl ==
946 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
947 if (irb->scsw.cc == 1)
948 /* Basic sense hasn't started. Try again. */
949 ccw_device_do_sense(cdev, irb);
951 CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
952 "interrupt during w4sense...\n",
953 cdev->private->dev_id.ssid,
954 cdev->private->dev_id.devno);
956 cdev->handler (cdev, 0, irb);
961 * Check if a halt or clear has been issued in the meanwhile. If yes,
962 * only deliver the halt/clear interrupt to the device driver as if it
963 * had killed the original request.
965 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
966 /* Retry Basic Sense if requested. */
967 if (cdev->private->flags.intretry) {
968 cdev->private->flags.intretry = 0;
969 ccw_device_do_sense(cdev, irb);
972 cdev->private->flags.dosense = 0;
973 memset(&cdev->private->irb, 0, sizeof(struct irb));
974 ccw_device_accumulate_irb(cdev, irb);
977 /* Add basic sense info to irb. */
978 ccw_device_accumulate_basic_sense(cdev, irb);
979 if (cdev->private->flags.dosense) {
980 /* Another basic sense is needed. */
981 ccw_device_do_sense(cdev, irb);
985 cdev->private->state = DEV_STATE_ONLINE;
986 /* Call the handler. */
987 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
988 /* Start delayed path verification. */
989 ccw_device_online_verify(cdev, 0);
993 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
997 irb = (struct irb *) __LC_IRB;
998 /* Accumulate status. We don't do basic sense. */
999 ccw_device_accumulate_irb(cdev, irb);
1000 /* Remember to clear irb to avoid residuals. */
1001 memset(&cdev->private->irb, 0, sizeof(struct irb));
1002 /* Try to start delayed device verification. */
1003 ccw_device_online_verify(cdev, 0);
1004 /* Note: Don't call handler for cio initiated clear! */
1008 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
1010 struct subchannel *sch;
1012 sch = to_subchannel(cdev->dev.parent);
1013 ccw_device_set_timeout(cdev, 0);
1014 /* Start delayed path verification. */
1015 ccw_device_online_verify(cdev, 0);
1016 /* OK, i/o is dead now. Call interrupt handler. */
1018 cdev->handler(cdev, cdev->private->intparm,
1023 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1027 ret = ccw_device_cancel_halt_clear(cdev);
1028 if (ret == -EBUSY) {
1029 ccw_device_set_timeout(cdev, 3*HZ);
1032 /* Start delayed path verification. */
1033 ccw_device_online_verify(cdev, 0);
1035 cdev->handler(cdev, cdev->private->intparm,
1039 void device_kill_io(struct subchannel *sch)
1042 struct ccw_device *cdev;
1044 cdev = sch->dev.driver_data;
1045 ret = ccw_device_cancel_halt_clear(cdev);
1046 if (ret == -EBUSY) {
1047 ccw_device_set_timeout(cdev, 3*HZ);
1048 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1051 /* Start delayed path verification. */
1052 ccw_device_online_verify(cdev, 0);
1054 cdev->handler(cdev, cdev->private->intparm,
1059 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1061 /* Start verification after current task finished. */
1062 cdev->private->flags.doverify = 1;
1066 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1070 switch (dev_event) {
1071 case DEV_EVENT_INTERRUPT:
1072 irb = (struct irb *) __LC_IRB;
1073 /* Check for unsolicited interrupt. */
1074 if ((irb->scsw.stctl ==
1075 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1077 /* FIXME: we should restart stlck here, but this
1078 * is extremely unlikely ... */
1081 ccw_device_accumulate_irb(cdev, irb);
1082 /* We don't care about basic sense etc. */
1084 default: /* timeout */
1088 wake_up(&cdev->private->wait_q);
1092 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1094 struct subchannel *sch;
1096 sch = to_subchannel(cdev->dev.parent);
1097 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1098 /* Couldn't enable the subchannel for i/o. Sick device. */
1101 /* After 60s the device recognition is considered to have failed. */
1102 ccw_device_set_timeout(cdev, 60*HZ);
1104 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1105 ccw_device_sense_id_start(cdev);
1109 device_trigger_reprobe(struct subchannel *sch)
1111 struct ccw_device *cdev;
1113 if (!sch->dev.driver_data)
1115 cdev = sch->dev.driver_data;
1116 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1119 /* Update some values. */
1120 if (stsch(sch->schid, &sch->schib))
1122 if (!sch->schib.pmcw.dnv)
1125 * The pim, pam, pom values may not be accurate, but they are the best
1126 * we have before performing device selection :/
1128 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1129 /* Re-set some bits in the pmcw that were lost. */
1130 sch->schib.pmcw.isc = 3;
1131 sch->schib.pmcw.csense = 1;
1132 sch->schib.pmcw.ena = 0;
1133 if ((sch->lpm & (sch->lpm - 1)) != 0)
1134 sch->schib.pmcw.mp = 1;
1135 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1136 /* We should also udate ssd info, but this has to wait. */
1137 /* Check if this is another device which appeared on the same sch. */
1138 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1139 PREPARE_WORK(&cdev->private->kick_work,
1140 ccw_device_move_to_orphanage);
1141 queue_work(ccw_device_work, &cdev->private->kick_work);
1143 ccw_device_start_id(cdev, 0);
1147 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1149 struct subchannel *sch;
1151 sch = to_subchannel(cdev->dev.parent);
1153 * An interrupt in state offline means a previous disable was not
1154 * successful. Try again.
1156 cio_disable_subchannel(sch);
1160 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1162 retry_set_schib(cdev);
1163 cdev->private->state = DEV_STATE_ONLINE;
1164 dev_fsm_event(cdev, dev_event);
1167 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1168 enum dev_event dev_event)
1170 cmf_retry_copy_block(cdev);
1171 cdev->private->state = DEV_STATE_ONLINE;
1172 dev_fsm_event(cdev, dev_event);
1176 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1178 ccw_device_set_timeout(cdev, 0);
1179 if (dev_event == DEV_EVENT_NOTOPER)
1180 cdev->private->state = DEV_STATE_NOT_OPER;
1182 cdev->private->state = DEV_STATE_OFFLINE;
1183 wake_up(&cdev->private->wait_q);
1187 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1191 ret = ccw_device_cancel_halt_clear(cdev);
1194 cdev->private->state = DEV_STATE_OFFLINE;
1195 wake_up(&cdev->private->wait_q);
1198 cdev->private->state = DEV_STATE_NOT_OPER;
1199 wake_up(&cdev->private->wait_q);
1202 ccw_device_set_timeout(cdev, HZ/10);
1207 * No operation action. This is used e.g. to ignore a timeout event in
1211 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1216 * Bug operation action.
1219 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1221 CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1222 cdev->private->state, dev_event);
1227 * device statemachine
1229 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1230 [DEV_STATE_NOT_OPER] = {
1231 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1232 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1233 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1234 [DEV_EVENT_VERIFY] = ccw_device_nop,
1236 [DEV_STATE_SENSE_PGID] = {
1237 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1238 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1239 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1240 [DEV_EVENT_VERIFY] = ccw_device_nop,
1242 [DEV_STATE_SENSE_ID] = {
1243 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1244 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1245 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1246 [DEV_EVENT_VERIFY] = ccw_device_nop,
1248 [DEV_STATE_OFFLINE] = {
1249 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1250 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1251 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1252 [DEV_EVENT_VERIFY] = ccw_device_nop,
1254 [DEV_STATE_VERIFY] = {
1255 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1256 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1257 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1258 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1260 [DEV_STATE_ONLINE] = {
1261 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1262 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1263 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1264 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1266 [DEV_STATE_W4SENSE] = {
1267 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1268 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1269 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1270 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1272 [DEV_STATE_DISBAND_PGID] = {
1273 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1274 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1275 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1276 [DEV_EVENT_VERIFY] = ccw_device_nop,
1278 [DEV_STATE_BOXED] = {
1279 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1280 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1281 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1282 [DEV_EVENT_VERIFY] = ccw_device_nop,
1284 /* states to wait for i/o completion before doing something */
1285 [DEV_STATE_CLEAR_VERIFY] = {
1286 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1287 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1288 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1289 [DEV_EVENT_VERIFY] = ccw_device_nop,
1291 [DEV_STATE_TIMEOUT_KILL] = {
1292 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1293 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1294 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1295 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1297 [DEV_STATE_QUIESCE] = {
1298 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1299 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1300 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1301 [DEV_EVENT_VERIFY] = ccw_device_nop,
1303 /* special states for devices gone not operational */
1304 [DEV_STATE_DISCONNECTED] = {
1305 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1306 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1307 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
1308 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1310 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1311 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1312 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1313 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1314 [DEV_EVENT_VERIFY] = ccw_device_nop,
1316 [DEV_STATE_CMFCHANGE] = {
1317 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1318 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1319 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1320 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1322 [DEV_STATE_CMFUPDATE] = {
1323 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1324 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1325 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1326 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1331 * io_subchannel_irq is called for "real" interrupts or for status
1332 * pending conditions on msch.
1335 io_subchannel_irq (struct device *pdev)
1337 struct ccw_device *cdev;
1339 cdev = to_subchannel(pdev)->dev.driver_data;
1341 CIO_TRACE_EVENT (3, "IRQ");
1342 CIO_TRACE_EVENT (3, pdev->bus_id);
1344 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1347 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);