2 * finite state machine for device handling
4 * Copyright IBM Corp. 2002, 2008
5 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/jiffies.h>
12 #include <linux/string.h>
14 #include <asm/ccwdev.h>
16 #include <asm/chpid.h>
19 #include "cio_debug.h"
26 static int timeout_log_enabled;
28 static int __init ccw_timeout_log_setup(char *unused)
30 timeout_log_enabled = 1;
34 __setup("ccw_timeout_log", ccw_timeout_log_setup);
36 static void ccw_timeout_log(struct ccw_device *cdev)
39 struct subchannel *sch;
40 struct io_subchannel_private *private;
44 sch = to_subchannel(cdev->dev.parent);
45 private = to_io_private(sch);
47 cc = stsch(sch->schid, &schib);
49 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
50 "device information:\n", get_tod_clock());
51 printk(KERN_WARNING "cio: orb:\n");
52 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
53 orb, sizeof(*orb), 0);
54 printk(KERN_WARNING "cio: ccw device bus id: %s\n",
55 dev_name(&cdev->dev));
56 printk(KERN_WARNING "cio: subchannel bus id: %s\n",
58 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
59 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
62 printk(KERN_WARNING "cio: orb indicates transport mode\n");
63 printk(KERN_WARNING "cio: last tcw:\n");
64 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
65 (void *)(addr_t)orb->tm.tcw,
66 sizeof(struct tcw), 0);
68 printk(KERN_WARNING "cio: orb indicates command mode\n");
69 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
70 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
71 printk(KERN_WARNING "cio: last channel program "
74 printk(KERN_WARNING "cio: last channel program:\n");
76 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
77 (void *)(addr_t)orb->cmd.cpa,
78 sizeof(struct ccw1), 0);
80 printk(KERN_WARNING "cio: ccw device state: %d\n",
81 cdev->private->state);
82 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
83 printk(KERN_WARNING "cio: schib:\n");
84 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
85 &schib, sizeof(schib), 0);
86 printk(KERN_WARNING "cio: ccw device flags:\n");
87 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
88 &cdev->private->flags, sizeof(cdev->private->flags), 0);
92 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
95 ccw_device_timeout(unsigned long data)
97 struct ccw_device *cdev;
99 cdev = (struct ccw_device *) data;
100 spin_lock_irq(cdev->ccwlock);
101 if (timeout_log_enabled)
102 ccw_timeout_log(cdev);
103 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
104 spin_unlock_irq(cdev->ccwlock);
111 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
114 del_timer(&cdev->private->timer);
117 if (timer_pending(&cdev->private->timer)) {
118 if (mod_timer(&cdev->private->timer, jiffies + expires))
121 cdev->private->timer.function = ccw_device_timeout;
122 cdev->private->timer.data = (unsigned long) cdev;
123 cdev->private->timer.expires = jiffies + expires;
124 add_timer(&cdev->private->timer);
128 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
130 struct subchannel *sch;
133 sch = to_subchannel(cdev->dev.parent);
134 ret = cio_cancel_halt_clear(sch, &cdev->private->iretry);
137 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n",
138 cdev->private->dev_id.ssid,
139 cdev->private->dev_id.devno);
144 void ccw_device_update_sense_data(struct ccw_device *cdev)
146 memset(&cdev->id, 0, sizeof(cdev->id));
147 cdev->id.cu_type = cdev->private->senseid.cu_type;
148 cdev->id.cu_model = cdev->private->senseid.cu_model;
149 cdev->id.dev_type = cdev->private->senseid.dev_type;
150 cdev->id.dev_model = cdev->private->senseid.dev_model;
153 int ccw_device_test_sense_data(struct ccw_device *cdev)
155 return cdev->id.cu_type == cdev->private->senseid.cu_type &&
156 cdev->id.cu_model == cdev->private->senseid.cu_model &&
157 cdev->id.dev_type == cdev->private->senseid.dev_type &&
158 cdev->id.dev_model == cdev->private->senseid.dev_model;
162 * The machine won't give us any notification by machine check if a chpid has
163 * been varied online on the SE so we have to find out by magic (i. e. driving
164 * the channel subsystem to device selection and updating our path masks).
167 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
173 for (i = 0; i<8; i++) {
175 if (!(sch->lpm & mask))
179 chpid.id = sch->schib.pmcw.chpid[i];
180 if (!chp_is_registered(chpid))
181 css_schedule_eval_all();
186 * Stop device recognition.
189 ccw_device_recog_done(struct ccw_device *cdev, int state)
191 struct subchannel *sch;
194 sch = to_subchannel(cdev->dev.parent);
196 if (cio_disable_subchannel(sch))
197 state = DEV_STATE_NOT_OPER;
199 * Now that we tried recognition, we have performed device selection
200 * through ssch() and the path information is up to date.
204 /* Check since device may again have become not operational. */
205 if (cio_update_schib(sch))
206 state = DEV_STATE_NOT_OPER;
208 sch->lpm = sch->schib.pmcw.pam & sch->opm;
210 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
211 /* Force reprobe on all chpids. */
213 if (sch->lpm != old_lpm)
214 __recover_lost_chpids(sch, old_lpm);
215 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
216 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
217 cdev->private->flags.recog_done = 1;
218 cdev->private->state = DEV_STATE_DISCONNECTED;
219 wake_up(&cdev->private->wait_q);
222 if (cdev->private->flags.resuming) {
223 cdev->private->state = state;
224 cdev->private->flags.recog_done = 1;
225 wake_up(&cdev->private->wait_q);
229 case DEV_STATE_NOT_OPER:
231 case DEV_STATE_OFFLINE:
233 ccw_device_update_sense_data(cdev);
236 cdev->private->state = DEV_STATE_OFFLINE;
237 cdev->private->flags.recog_done = 1;
238 if (ccw_device_test_sense_data(cdev)) {
239 cdev->private->flags.donotify = 1;
240 ccw_device_online(cdev);
241 wake_up(&cdev->private->wait_q);
243 ccw_device_update_sense_data(cdev);
244 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
247 case DEV_STATE_BOXED:
248 if (cdev->id.cu_type != 0) { /* device was recognized before */
249 cdev->private->flags.recog_done = 1;
250 cdev->private->state = DEV_STATE_BOXED;
251 wake_up(&cdev->private->wait_q);
256 cdev->private->state = state;
257 io_subchannel_recog_done(cdev);
258 wake_up(&cdev->private->wait_q);
262 * Function called from device_id.c after sense id has completed.
265 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
269 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
271 case -ETIME: /* Sense id stopped by timeout. */
272 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
275 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
281 * ccw_device_notify() - inform the device's driver about an event
282 * @cdev: device for which an event occurred
283 * @event: event that occurred
286 * -%EINVAL if the device is offline or has no driver.
287 * -%EOPNOTSUPP if the device's driver has no notifier registered.
288 * %NOTIFY_OK if the driver wants to keep the device.
289 * %NOTIFY_BAD if the driver doesn't want to keep the device.
291 int ccw_device_notify(struct ccw_device *cdev, int event)
299 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
300 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
302 if (!cdev->drv->notify) {
306 if (cdev->drv->notify(cdev, event))
314 static void ccw_device_oper_notify(struct ccw_device *cdev)
316 struct subchannel *sch = to_subchannel(cdev->dev.parent);
318 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
319 /* Reenable channel measurements, if needed. */
320 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
321 /* Save indication for new paths. */
322 cdev->private->path_new_mask = sch->vpm;
325 /* Driver doesn't want device back. */
326 ccw_device_set_notoper(cdev);
327 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
331 * Finished with online/offline processing.
334 ccw_device_done(struct ccw_device *cdev, int state)
336 struct subchannel *sch;
338 sch = to_subchannel(cdev->dev.parent);
340 ccw_device_set_timeout(cdev, 0);
342 if (state != DEV_STATE_ONLINE)
343 cio_disable_subchannel(sch);
345 /* Reset device status. */
346 memset(&cdev->private->irb, 0, sizeof(struct irb));
348 cdev->private->state = state;
351 case DEV_STATE_BOXED:
352 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
353 cdev->private->dev_id.devno, sch->schid.sch_no);
355 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK)
356 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
357 cdev->private->flags.donotify = 0;
359 case DEV_STATE_NOT_OPER:
360 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
361 cdev->private->dev_id.devno, sch->schid.sch_no);
362 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
363 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
365 ccw_device_set_disconnected(cdev);
366 cdev->private->flags.donotify = 0;
368 case DEV_STATE_DISCONNECTED:
369 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
370 "%04x\n", cdev->private->dev_id.devno,
372 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) {
373 cdev->private->state = DEV_STATE_NOT_OPER;
374 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
376 ccw_device_set_disconnected(cdev);
377 cdev->private->flags.donotify = 0;
383 if (cdev->private->flags.donotify) {
384 cdev->private->flags.donotify = 0;
385 ccw_device_oper_notify(cdev);
387 wake_up(&cdev->private->wait_q);
391 * Start device recognition.
393 void ccw_device_recognition(struct ccw_device *cdev)
395 struct subchannel *sch = to_subchannel(cdev->dev.parent);
398 * We used to start here with a sense pgid to find out whether a device
399 * is locked by someone else. Unfortunately, the sense pgid command
400 * code has other meanings on devices predating the path grouping
401 * algorithm, so we start with sense id and box the device after an
402 * timeout (or if sense pgid during path verification detects the device
403 * is locked, as may happen on newer devices).
405 cdev->private->flags.recog_done = 0;
406 cdev->private->state = DEV_STATE_SENSE_ID;
407 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
408 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
411 ccw_device_sense_id_start(cdev);
415 * Handle events for states that use the ccw request infrastructure.
417 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
420 case DEV_EVENT_NOTOPER:
421 ccw_request_notoper(cdev);
423 case DEV_EVENT_INTERRUPT:
424 ccw_request_handler(cdev);
426 case DEV_EVENT_TIMEOUT:
427 ccw_request_timeout(cdev);
434 static void ccw_device_report_path_events(struct ccw_device *cdev)
436 struct subchannel *sch = to_subchannel(cdev->dev.parent);
440 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
441 path_event[chp] = PE_NONE;
442 if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
443 path_event[chp] |= PE_PATH_GONE;
444 if (mask & cdev->private->path_new_mask & sch->vpm)
445 path_event[chp] |= PE_PATH_AVAILABLE;
446 if (mask & cdev->private->pgid_reset_mask & sch->vpm)
447 path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
449 if (cdev->online && cdev->drv->path_event)
450 cdev->drv->path_event(cdev, path_event);
453 static void ccw_device_reset_path_events(struct ccw_device *cdev)
455 cdev->private->path_gone_mask = 0;
456 cdev->private->path_new_mask = 0;
457 cdev->private->pgid_reset_mask = 0;
460 static void create_fake_irb(struct irb *irb, int type)
462 memset(irb, 0, sizeof(*irb));
463 if (type == FAKE_CMD_IRB) {
464 struct cmd_scsw *scsw = &irb->scsw.cmd;
466 scsw->fctl = SCSW_FCTL_START_FUNC;
467 scsw->actl = SCSW_ACTL_START_PEND;
468 scsw->stctl = SCSW_STCTL_STATUS_PEND;
469 } else if (type == FAKE_TM_IRB) {
470 struct tm_scsw *scsw = &irb->scsw.tm;
473 scsw->fctl = SCSW_FCTL_START_FUNC;
474 scsw->actl = SCSW_ACTL_START_PEND;
475 scsw->stctl = SCSW_STCTL_STATUS_PEND;
479 void ccw_device_verify_done(struct ccw_device *cdev, int err)
481 struct subchannel *sch;
483 sch = to_subchannel(cdev->dev.parent);
484 /* Update schib - pom may have changed. */
485 if (cio_update_schib(sch)) {
489 /* Update lpm with verified path mask. */
491 /* Repeat path verification? */
492 if (cdev->private->flags.doverify) {
493 ccw_device_verify_start(cdev);
499 ccw_device_done(cdev, DEV_STATE_ONLINE);
500 /* Deliver fake irb to device driver, if needed. */
501 if (cdev->private->flags.fake_irb) {
502 create_fake_irb(&cdev->private->irb,
503 cdev->private->flags.fake_irb);
504 cdev->private->flags.fake_irb = 0;
506 cdev->handler(cdev, cdev->private->intparm,
507 &cdev->private->irb);
508 memset(&cdev->private->irb, 0, sizeof(struct irb));
510 ccw_device_report_path_events(cdev);
514 /* Reset oper notify indication after verify error. */
515 cdev->private->flags.donotify = 0;
516 ccw_device_done(cdev, DEV_STATE_BOXED);
519 /* Reset oper notify indication after verify error. */
520 cdev->private->flags.donotify = 0;
521 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
524 /* Reset oper notify indication after verify error. */
525 cdev->private->flags.donotify = 0;
526 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
529 ccw_device_reset_path_events(cdev);
536 ccw_device_online(struct ccw_device *cdev)
538 struct subchannel *sch;
541 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
542 (cdev->private->state != DEV_STATE_BOXED))
544 sch = to_subchannel(cdev->dev.parent);
545 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
547 /* Couldn't enable the subchannel for i/o. Sick device. */
549 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
552 /* Start initial path verification. */
553 cdev->private->state = DEV_STATE_VERIFY;
554 ccw_device_verify_start(cdev);
559 ccw_device_disband_done(struct ccw_device *cdev, int err)
563 ccw_device_done(cdev, DEV_STATE_OFFLINE);
566 ccw_device_done(cdev, DEV_STATE_BOXED);
569 cdev->private->flags.donotify = 0;
570 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
579 ccw_device_offline(struct ccw_device *cdev)
581 struct subchannel *sch;
583 /* Allow ccw_device_offline while disconnected. */
584 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
585 cdev->private->state == DEV_STATE_NOT_OPER) {
586 cdev->private->flags.donotify = 0;
587 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
590 if (cdev->private->state == DEV_STATE_BOXED) {
591 ccw_device_done(cdev, DEV_STATE_BOXED);
594 if (ccw_device_is_orphan(cdev)) {
595 ccw_device_done(cdev, DEV_STATE_OFFLINE);
598 sch = to_subchannel(cdev->dev.parent);
599 if (cio_update_schib(sch))
601 if (scsw_actl(&sch->schib.scsw) != 0)
603 if (cdev->private->state != DEV_STATE_ONLINE)
605 /* Are we doing path grouping? */
606 if (!cdev->private->flags.pgroup) {
607 /* No, set state offline immediately. */
608 ccw_device_done(cdev, DEV_STATE_OFFLINE);
611 /* Start Set Path Group commands. */
612 cdev->private->state = DEV_STATE_DISBAND_PGID;
613 ccw_device_disband_start(cdev);
618 * Handle not operational event in non-special state.
620 static void ccw_device_generic_notoper(struct ccw_device *cdev,
621 enum dev_event dev_event)
623 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
624 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
626 ccw_device_set_disconnected(cdev);
630 * Handle path verification event in offline state.
632 static void ccw_device_offline_verify(struct ccw_device *cdev,
633 enum dev_event dev_event)
635 struct subchannel *sch = to_subchannel(cdev->dev.parent);
637 css_schedule_eval(sch->schid);
641 * Handle path verification event.
644 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
646 struct subchannel *sch;
648 if (cdev->private->state == DEV_STATE_W4SENSE) {
649 cdev->private->flags.doverify = 1;
652 sch = to_subchannel(cdev->dev.parent);
654 * Since we might not just be coming from an interrupt from the
655 * subchannel we have to update the schib.
657 if (cio_update_schib(sch)) {
658 ccw_device_verify_done(cdev, -ENODEV);
662 if (scsw_actl(&sch->schib.scsw) != 0 ||
663 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
664 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
666 * No final status yet or final status not yet delivered
667 * to the device driver. Can't do path verification now,
668 * delay until final status was delivered.
670 cdev->private->flags.doverify = 1;
673 /* Device is idle, we can do the path verification. */
674 cdev->private->state = DEV_STATE_VERIFY;
675 ccw_device_verify_start(cdev);
679 * Handle path verification event in boxed state.
681 static void ccw_device_boxed_verify(struct ccw_device *cdev,
682 enum dev_event dev_event)
684 struct subchannel *sch = to_subchannel(cdev->dev.parent);
687 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
688 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
690 ccw_device_online_verify(cdev, dev_event);
692 css_schedule_eval(sch->schid);
696 * Pass interrupt to device driver.
698 static int ccw_device_call_handler(struct ccw_device *cdev)
704 * we allow for the device action handler if .
705 * - we received ending status
706 * - the action handler requested to see all interrupts
707 * - we received an intermediate status
708 * - fast notification was requested (primary status)
709 * - unsolicited interrupts
711 stctl = scsw_stctl(&cdev->private->irb.scsw);
712 ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
713 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
714 (stctl == SCSW_STCTL_STATUS_PEND);
715 if (!ending_status &&
716 !cdev->private->options.repall &&
717 !(stctl & SCSW_STCTL_INTER_STATUS) &&
718 !(cdev->private->options.fast &&
719 (stctl & SCSW_STCTL_PRIM_STATUS)))
723 ccw_device_set_timeout(cdev, 0);
726 cdev->handler(cdev, cdev->private->intparm,
727 &cdev->private->irb);
729 memset(&cdev->private->irb, 0, sizeof(struct irb));
734 * Got an interrupt for a normal io (state online).
737 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
742 irb = this_cpu_ptr(&cio_irb);
743 is_cmd = !scsw_is_tm(&irb->scsw);
744 /* Check for unsolicited interrupt. */
745 if (!scsw_is_solicited(&irb->scsw)) {
746 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
747 !irb->esw.esw0.erw.cons) {
748 /* Unit check but no sense data. Need basic sense. */
749 if (ccw_device_do_sense(cdev, irb) != 0)
750 goto call_handler_unsol;
751 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
752 cdev->private->state = DEV_STATE_W4SENSE;
753 cdev->private->intparm = 0;
758 cdev->handler (cdev, 0, irb);
759 if (cdev->private->flags.doverify)
760 ccw_device_online_verify(cdev, 0);
763 /* Accumulate status and find out if a basic sense is needed. */
764 ccw_device_accumulate_irb(cdev, irb);
765 if (is_cmd && cdev->private->flags.dosense) {
766 if (ccw_device_do_sense(cdev, irb) == 0) {
767 cdev->private->state = DEV_STATE_W4SENSE;
771 /* Call the handler. */
772 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
773 /* Start delayed path verification. */
774 ccw_device_online_verify(cdev, 0);
778 * Got an timeout in online state.
781 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
785 ccw_device_set_timeout(cdev, 0);
786 cdev->private->iretry = 255;
787 ret = ccw_device_cancel_halt_clear(cdev);
789 ccw_device_set_timeout(cdev, 3*HZ);
790 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
794 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
795 else if (cdev->handler)
796 cdev->handler(cdev, cdev->private->intparm,
797 ERR_PTR(-ETIMEDOUT));
801 * Got an interrupt for a basic sense.
804 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
808 irb = this_cpu_ptr(&cio_irb);
809 /* Check for unsolicited interrupt. */
810 if (scsw_stctl(&irb->scsw) ==
811 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
812 if (scsw_cc(&irb->scsw) == 1)
813 /* Basic sense hasn't started. Try again. */
814 ccw_device_do_sense(cdev, irb);
816 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
817 "interrupt during w4sense...\n",
818 cdev->private->dev_id.ssid,
819 cdev->private->dev_id.devno);
821 cdev->handler (cdev, 0, irb);
826 * Check if a halt or clear has been issued in the meanwhile. If yes,
827 * only deliver the halt/clear interrupt to the device driver as if it
828 * had killed the original request.
830 if (scsw_fctl(&irb->scsw) &
831 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
832 cdev->private->flags.dosense = 0;
833 memset(&cdev->private->irb, 0, sizeof(struct irb));
834 ccw_device_accumulate_irb(cdev, irb);
837 /* Add basic sense info to irb. */
838 ccw_device_accumulate_basic_sense(cdev, irb);
839 if (cdev->private->flags.dosense) {
840 /* Another basic sense is needed. */
841 ccw_device_do_sense(cdev, irb);
845 cdev->private->state = DEV_STATE_ONLINE;
846 /* In case sensing interfered with setting the device online */
847 wake_up(&cdev->private->wait_q);
848 /* Call the handler. */
849 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
850 /* Start delayed path verification. */
851 ccw_device_online_verify(cdev, 0);
855 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
857 ccw_device_set_timeout(cdev, 0);
858 /* Start delayed path verification. */
859 ccw_device_online_verify(cdev, 0);
860 /* OK, i/o is dead now. Call interrupt handler. */
862 cdev->handler(cdev, cdev->private->intparm,
867 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
871 ret = ccw_device_cancel_halt_clear(cdev);
873 ccw_device_set_timeout(cdev, 3*HZ);
876 /* Start delayed path verification. */
877 ccw_device_online_verify(cdev, 0);
879 cdev->handler(cdev, cdev->private->intparm,
883 void ccw_device_kill_io(struct ccw_device *cdev)
887 cdev->private->iretry = 255;
888 ret = ccw_device_cancel_halt_clear(cdev);
890 ccw_device_set_timeout(cdev, 3*HZ);
891 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
894 /* Start delayed path verification. */
895 ccw_device_online_verify(cdev, 0);
897 cdev->handler(cdev, cdev->private->intparm,
902 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
904 /* Start verification after current task finished. */
905 cdev->private->flags.doverify = 1;
909 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
911 struct subchannel *sch;
913 sch = to_subchannel(cdev->dev.parent);
914 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
915 /* Couldn't enable the subchannel for i/o. Sick device. */
917 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
918 ccw_device_sense_id_start(cdev);
921 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
923 struct subchannel *sch;
925 if (cdev->private->state != DEV_STATE_DISCONNECTED)
928 sch = to_subchannel(cdev->dev.parent);
929 /* Update some values. */
930 if (cio_update_schib(sch))
933 * The pim, pam, pom values may not be accurate, but they are the best
934 * we have before performing device selection :/
936 sch->lpm = sch->schib.pmcw.pam & sch->opm;
938 * Use the initial configuration since we can't be shure that the old
941 io_subchannel_init_config(sch);
942 if (cio_commit_config(sch))
945 /* We should also udate ssd info, but this has to wait. */
946 /* Check if this is another device which appeared on the same sch. */
947 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
948 css_schedule_eval(sch->schid);
950 ccw_device_start_id(cdev, 0);
953 static void ccw_device_disabled_irq(struct ccw_device *cdev,
954 enum dev_event dev_event)
956 struct subchannel *sch;
958 sch = to_subchannel(cdev->dev.parent);
960 * An interrupt in a disabled state means a previous disable was not
961 * successful - should not happen, but we try to disable again.
963 cio_disable_subchannel(sch);
967 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
969 retry_set_schib(cdev);
970 cdev->private->state = DEV_STATE_ONLINE;
971 dev_fsm_event(cdev, dev_event);
974 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
975 enum dev_event dev_event)
977 cmf_retry_copy_block(cdev);
978 cdev->private->state = DEV_STATE_ONLINE;
979 dev_fsm_event(cdev, dev_event);
983 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
985 ccw_device_set_timeout(cdev, 0);
986 cdev->private->state = DEV_STATE_NOT_OPER;
987 wake_up(&cdev->private->wait_q);
991 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
995 ret = ccw_device_cancel_halt_clear(cdev);
997 ccw_device_set_timeout(cdev, HZ/10);
999 cdev->private->state = DEV_STATE_NOT_OPER;
1000 wake_up(&cdev->private->wait_q);
1005 * No operation action. This is used e.g. to ignore a timeout event in
1009 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1014 * device statemachine
1016 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1017 [DEV_STATE_NOT_OPER] = {
1018 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1019 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1020 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1021 [DEV_EVENT_VERIFY] = ccw_device_nop,
1023 [DEV_STATE_SENSE_ID] = {
1024 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1025 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1026 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1027 [DEV_EVENT_VERIFY] = ccw_device_nop,
1029 [DEV_STATE_OFFLINE] = {
1030 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1031 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1032 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1033 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1035 [DEV_STATE_VERIFY] = {
1036 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1037 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1038 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1039 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1041 [DEV_STATE_ONLINE] = {
1042 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1043 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1044 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1045 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1047 [DEV_STATE_W4SENSE] = {
1048 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1049 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1050 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1051 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1053 [DEV_STATE_DISBAND_PGID] = {
1054 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1055 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1056 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1057 [DEV_EVENT_VERIFY] = ccw_device_nop,
1059 [DEV_STATE_BOXED] = {
1060 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1061 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
1062 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1063 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1065 /* states to wait for i/o completion before doing something */
1066 [DEV_STATE_TIMEOUT_KILL] = {
1067 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1068 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1069 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1070 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1072 [DEV_STATE_QUIESCE] = {
1073 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1074 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1075 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1076 [DEV_EVENT_VERIFY] = ccw_device_nop,
1078 /* special states for devices gone not operational */
1079 [DEV_STATE_DISCONNECTED] = {
1080 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1081 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1082 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1083 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1085 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1086 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1087 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1088 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1089 [DEV_EVENT_VERIFY] = ccw_device_nop,
1091 [DEV_STATE_CMFCHANGE] = {
1092 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1093 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1094 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1095 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1097 [DEV_STATE_CMFUPDATE] = {
1098 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1099 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1100 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1101 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1103 [DEV_STATE_STEAL_LOCK] = {
1104 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1105 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1106 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1107 [DEV_EVENT_VERIFY] = ccw_device_nop,
1111 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);