2 * drivers/s390/cio/device_fsm.c
3 * finite state machine for device handling
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
7 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/jiffies.h>
14 #include <linux/string.h>
16 #include <asm/ccwdev.h>
20 #include "cio_debug.h"
27 device_is_online(struct subchannel
*sch
)
29 struct ccw_device
*cdev
;
31 if (!sch
->dev
.driver_data
)
33 cdev
= sch
->dev
.driver_data
;
34 return (cdev
->private->state
== DEV_STATE_ONLINE
);
38 device_is_disconnected(struct subchannel
*sch
)
40 struct ccw_device
*cdev
;
42 if (!sch
->dev
.driver_data
)
44 cdev
= sch
->dev
.driver_data
;
45 return (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
46 cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
);
50 device_set_disconnected(struct subchannel
*sch
)
52 struct ccw_device
*cdev
;
54 if (!sch
->dev
.driver_data
)
56 cdev
= sch
->dev
.driver_data
;
57 ccw_device_set_timeout(cdev
, 0);
58 cdev
->private->flags
.fake_irb
= 0;
59 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
62 void device_set_intretry(struct subchannel
*sch
)
64 struct ccw_device
*cdev
;
66 cdev
= sch
->dev
.driver_data
;
69 cdev
->private->flags
.intretry
= 1;
72 int device_trigger_verify(struct subchannel
*sch
)
74 struct ccw_device
*cdev
;
76 cdev
= sch
->dev
.driver_data
;
77 if (!cdev
|| !cdev
->online
)
79 dev_fsm_event(cdev
, DEV_EVENT_VERIFY
);
84 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
87 ccw_device_timeout(unsigned long data
)
89 struct ccw_device
*cdev
;
91 cdev
= (struct ccw_device
*) data
;
92 spin_lock_irq(cdev
->ccwlock
);
93 dev_fsm_event(cdev
, DEV_EVENT_TIMEOUT
);
94 spin_unlock_irq(cdev
->ccwlock
);
101 ccw_device_set_timeout(struct ccw_device
*cdev
, int expires
)
104 del_timer(&cdev
->private->timer
);
107 if (timer_pending(&cdev
->private->timer
)) {
108 if (mod_timer(&cdev
->private->timer
, jiffies
+ expires
))
111 cdev
->private->timer
.function
= ccw_device_timeout
;
112 cdev
->private->timer
.data
= (unsigned long) cdev
;
113 cdev
->private->timer
.expires
= jiffies
+ expires
;
114 add_timer(&cdev
->private->timer
);
117 /* Kill any pending timers after machine check. */
119 device_kill_pending_timer(struct subchannel
*sch
)
121 struct ccw_device
*cdev
;
123 if (!sch
->dev
.driver_data
)
125 cdev
= sch
->dev
.driver_data
;
126 ccw_device_set_timeout(cdev
, 0);
130 * Cancel running i/o. This is called repeatedly since halt/clear are
131 * asynchronous operations. We do one try with cio_cancel, two tries
132 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
133 * Returns 0 if device now idle, -ENODEV for device not operational and
134 * -EBUSY if an interrupt is expected (either from halt/clear or from a
138 ccw_device_cancel_halt_clear(struct ccw_device
*cdev
)
140 struct subchannel
*sch
;
143 sch
= to_subchannel(cdev
->dev
.parent
);
144 ret
= stsch(sch
->schid
, &sch
->schib
);
145 if (ret
|| !sch
->schib
.pmcw
.dnv
)
147 if (!sch
->schib
.pmcw
.ena
|| sch
->schib
.scsw
.actl
== 0)
148 /* Not operational or no activity -> done. */
150 /* Stage 1: cancel io. */
151 if (!(sch
->schib
.scsw
.actl
& SCSW_ACTL_HALT_PEND
) &&
152 !(sch
->schib
.scsw
.actl
& SCSW_ACTL_CLEAR_PEND
)) {
153 ret
= cio_cancel(sch
);
156 /* cancel io unsuccessful. From now on it is asynchronous. */
157 cdev
->private->iretry
= 3; /* 3 halt retries. */
159 if (!(sch
->schib
.scsw
.actl
& SCSW_ACTL_CLEAR_PEND
)) {
160 /* Stage 2: halt io. */
161 if (cdev
->private->iretry
) {
162 cdev
->private->iretry
--;
165 return (ret
== 0) ? -EBUSY
: ret
;
167 /* halt io unsuccessful. */
168 cdev
->private->iretry
= 255; /* 255 clear retries. */
170 /* Stage 3: clear io. */
171 if (cdev
->private->iretry
) {
172 cdev
->private->iretry
--;
173 ret
= cio_clear (sch
);
174 return (ret
== 0) ? -EBUSY
: ret
;
176 panic("Can't stop i/o on subchannel.\n");
180 ccw_device_handle_oper(struct ccw_device
*cdev
)
182 struct subchannel
*sch
;
184 sch
= to_subchannel(cdev
->dev
.parent
);
185 cdev
->private->flags
.recog_done
= 1;
187 * Check if cu type and device type still match. If
188 * not, it is certainly another device and we have to
189 * de- and re-register. Also check here for non-matching devno.
191 if (cdev
->id
.cu_type
!= cdev
->private->senseid
.cu_type
||
192 cdev
->id
.cu_model
!= cdev
->private->senseid
.cu_model
||
193 cdev
->id
.dev_type
!= cdev
->private->senseid
.dev_type
||
194 cdev
->id
.dev_model
!= cdev
->private->senseid
.dev_model
||
195 cdev
->private->dev_id
.devno
!= sch
->schib
.pmcw
.dev
) {
196 PREPARE_WORK(&cdev
->private->kick_work
,
197 ccw_device_do_unreg_rereg
, cdev
);
198 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
201 cdev
->private->flags
.donotify
= 1;
206 * The machine won't give us any notification by machine check if a chpid has
207 * been varied online on the SE so we have to find out by magic (i. e. driving
208 * the channel subsystem to device selection and updating our path masks).
211 __recover_lost_chpids(struct subchannel
*sch
, int old_lpm
)
215 for (i
= 0; i
<8; i
++) {
217 if (!(sch
->lpm
& mask
))
221 chpid_is_actually_online(sch
->schib
.pmcw
.chpid
[i
]);
226 * Stop device recognition.
229 ccw_device_recog_done(struct ccw_device
*cdev
, int state
)
231 struct subchannel
*sch
;
232 int notify
, old_lpm
, same_dev
;
234 sch
= to_subchannel(cdev
->dev
.parent
);
236 ccw_device_set_timeout(cdev
, 0);
237 cio_disable_subchannel(sch
);
239 * Now that we tried recognition, we have performed device selection
240 * through ssch() and the path information is up to date.
243 stsch(sch
->schid
, &sch
->schib
);
244 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
245 /* Check since device may again have become not operational. */
246 if (!sch
->schib
.pmcw
.dnv
)
247 state
= DEV_STATE_NOT_OPER
;
248 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
)
249 /* Force reprobe on all chpids. */
251 if (sch
->lpm
!= old_lpm
)
252 __recover_lost_chpids(sch
, old_lpm
);
253 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
) {
254 if (state
== DEV_STATE_NOT_OPER
) {
255 cdev
->private->flags
.recog_done
= 1;
256 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
259 /* Boxed devices don't need extra treatment. */
262 same_dev
= 0; /* Keep the compiler quiet... */
264 case DEV_STATE_NOT_OPER
:
265 CIO_DEBUG(KERN_WARNING
, 2,
266 "SenseID : unknown device %04x on subchannel "
267 "0.%x.%04x\n", cdev
->private->dev_id
.devno
,
268 sch
->schid
.ssid
, sch
->schid
.sch_no
);
270 case DEV_STATE_OFFLINE
:
271 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
) {
272 same_dev
= ccw_device_handle_oper(cdev
);
275 /* fill out sense information */
276 memset(&cdev
->id
, 0, sizeof(cdev
->id
));
277 cdev
->id
.cu_type
= cdev
->private->senseid
.cu_type
;
278 cdev
->id
.cu_model
= cdev
->private->senseid
.cu_model
;
279 cdev
->id
.dev_type
= cdev
->private->senseid
.dev_type
;
280 cdev
->id
.dev_model
= cdev
->private->senseid
.dev_model
;
282 cdev
->private->state
= DEV_STATE_OFFLINE
;
284 /* Get device online again. */
285 ccw_device_online(cdev
);
286 wake_up(&cdev
->private->wait_q
);
290 /* Issue device info message. */
291 CIO_DEBUG(KERN_INFO
, 2, "SenseID : device 0.%x.%04x reports: "
292 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
294 cdev
->private->dev_id
.ssid
,
295 cdev
->private->dev_id
.devno
,
296 cdev
->id
.cu_type
, cdev
->id
.cu_model
,
297 cdev
->id
.dev_type
, cdev
->id
.dev_model
);
299 case DEV_STATE_BOXED
:
300 CIO_DEBUG(KERN_WARNING
, 2,
301 "SenseID : boxed device %04x on subchannel "
302 "0.%x.%04x\n", cdev
->private->dev_id
.devno
,
303 sch
->schid
.ssid
, sch
->schid
.sch_no
);
306 cdev
->private->state
= state
;
307 io_subchannel_recog_done(cdev
);
308 if (state
!= DEV_STATE_NOT_OPER
)
309 wake_up(&cdev
->private->wait_q
);
313 * Function called from device_id.c after sense id has completed.
316 ccw_device_sense_id_done(struct ccw_device
*cdev
, int err
)
320 ccw_device_recog_done(cdev
, DEV_STATE_OFFLINE
);
322 case -ETIME
: /* Sense id stopped by timeout. */
323 ccw_device_recog_done(cdev
, DEV_STATE_BOXED
);
326 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
332 ccw_device_oper_notify(void *data
)
334 struct ccw_device
*cdev
;
335 struct subchannel
*sch
;
339 sch
= to_subchannel(cdev
->dev
.parent
);
340 ret
= (sch
->driver
&& sch
->driver
->notify
) ?
341 sch
->driver
->notify(&sch
->dev
, CIO_OPER
) : 0;
343 /* Driver doesn't want device back. */
344 ccw_device_do_unreg_rereg(cdev
);
346 /* Reenable channel measurements, if needed. */
348 wake_up(&cdev
->private->wait_q
);
353 * Finished with online/offline processing.
356 ccw_device_done(struct ccw_device
*cdev
, int state
)
358 struct subchannel
*sch
;
360 sch
= to_subchannel(cdev
->dev
.parent
);
362 ccw_device_set_timeout(cdev
, 0);
364 if (state
!= DEV_STATE_ONLINE
)
365 cio_disable_subchannel(sch
);
367 /* Reset device status. */
368 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
370 cdev
->private->state
= state
;
373 if (state
== DEV_STATE_BOXED
)
374 CIO_DEBUG(KERN_WARNING
, 2,
375 "Boxed device %04x on subchannel %04x\n",
376 cdev
->private->dev_id
.devno
, sch
->schid
.sch_no
);
378 if (cdev
->private->flags
.donotify
) {
379 cdev
->private->flags
.donotify
= 0;
380 PREPARE_WORK(&cdev
->private->kick_work
, ccw_device_oper_notify
,
382 queue_work(ccw_device_notify_work
, &cdev
->private->kick_work
);
384 wake_up(&cdev
->private->wait_q
);
386 if (css_init_done
&& state
!= DEV_STATE_ONLINE
)
387 put_device (&cdev
->dev
);
390 static inline int cmp_pgid(struct pgid
*p1
, struct pgid
*p2
)
398 return memcmp(c1
+ 1, c2
+ 1, sizeof(struct pgid
) - 1);
401 static void __ccw_device_get_common_pgid(struct ccw_device
*cdev
)
407 for (i
= 0; i
< 8; i
++) {
408 if (cdev
->private->pgid
[i
].inf
.ps
.state1
== SNID_STATE1_RESET
)
411 if (cdev
->private->pgid
[last
].inf
.ps
.state1
==
413 /* First non-zero PGID */
417 if (cmp_pgid(&cdev
->private->pgid
[i
],
418 &cdev
->private->pgid
[last
]) == 0)
419 /* Non-conflicting PGIDs */
422 /* PGID mismatch, can't pathgroup. */
423 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
424 "0.%x.%04x, can't pathgroup\n",
425 cdev
->private->dev_id
.ssid
,
426 cdev
->private->dev_id
.devno
);
427 cdev
->private->options
.pgroup
= 0;
430 if (cdev
->private->pgid
[last
].inf
.ps
.state1
==
432 /* No previous pgid found */
433 memcpy(&cdev
->private->pgid
[0], &css
[0]->global_pgid
,
434 sizeof(struct pgid
));
436 /* Use existing pgid */
437 memcpy(&cdev
->private->pgid
[0], &cdev
->private->pgid
[last
],
438 sizeof(struct pgid
));
442 * Function called from device_pgid.c after sense path ground has completed.
445 ccw_device_sense_pgid_done(struct ccw_device
*cdev
, int err
)
447 struct subchannel
*sch
;
449 sch
= to_subchannel(cdev
->dev
.parent
);
451 case -EOPNOTSUPP
: /* path grouping not supported, use nop instead. */
452 cdev
->private->options
.pgroup
= 0;
454 case 0: /* success */
455 case -EACCES
: /* partial success, some paths not operational */
456 /* Check if all pgids are equal or 0. */
457 __ccw_device_get_common_pgid(cdev
);
459 case -ETIME
: /* Sense path group id stopped by timeout. */
460 case -EUSERS
: /* device is reserved for someone else. */
461 ccw_device_done(cdev
, DEV_STATE_BOXED
);
464 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
467 /* Start Path Group verification. */
468 cdev
->private->state
= DEV_STATE_VERIFY
;
469 cdev
->private->flags
.doverify
= 0;
470 ccw_device_verify_start(cdev
);
474 * Start device recognition.
477 ccw_device_recognition(struct ccw_device
*cdev
)
479 struct subchannel
*sch
;
482 if ((cdev
->private->state
!= DEV_STATE_NOT_OPER
) &&
483 (cdev
->private->state
!= DEV_STATE_BOXED
))
485 sch
= to_subchannel(cdev
->dev
.parent
);
486 ret
= cio_enable_subchannel(sch
, sch
->schib
.pmcw
.isc
);
488 /* Couldn't enable the subchannel for i/o. Sick device. */
491 /* After 60s the device recognition is considered to have failed. */
492 ccw_device_set_timeout(cdev
, 60*HZ
);
495 * We used to start here with a sense pgid to find out whether a device
496 * is locked by someone else. Unfortunately, the sense pgid command
497 * code has other meanings on devices predating the path grouping
498 * algorithm, so we start with sense id and box the device after an
499 * timeout (or if sense pgid during path verification detects the device
500 * is locked, as may happen on newer devices).
502 cdev
->private->flags
.recog_done
= 0;
503 cdev
->private->state
= DEV_STATE_SENSE_ID
;
504 ccw_device_sense_id_start(cdev
);
509 * Handle timeout in device recognition.
512 ccw_device_recog_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
516 ret
= ccw_device_cancel_halt_clear(cdev
);
519 ccw_device_recog_done(cdev
, DEV_STATE_BOXED
);
522 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
525 ccw_device_set_timeout(cdev
, 3*HZ
);
531 ccw_device_nopath_notify(void *data
)
533 struct ccw_device
*cdev
;
534 struct subchannel
*sch
;
538 sch
= to_subchannel(cdev
->dev
.parent
);
542 ret
= (sch
->driver
&& sch
->driver
->notify
) ?
543 sch
->driver
->notify(&sch
->dev
, CIO_NO_PATH
) : 0;
545 if (get_device(&sch
->dev
)) {
546 /* Driver doesn't want to keep device. */
547 cio_disable_subchannel(sch
);
548 if (get_device(&cdev
->dev
)) {
549 PREPARE_WORK(&cdev
->private->kick_work
,
550 ccw_device_call_sch_unregister
,
552 queue_work(ccw_device_work
,
553 &cdev
->private->kick_work
);
555 put_device(&sch
->dev
);
558 cio_disable_subchannel(sch
);
559 ccw_device_set_timeout(cdev
, 0);
560 cdev
->private->flags
.fake_irb
= 0;
561 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
562 wake_up(&cdev
->private->wait_q
);
567 ccw_device_verify_done(struct ccw_device
*cdev
, int err
)
569 struct subchannel
*sch
;
571 sch
= to_subchannel(cdev
->dev
.parent
);
572 /* Update schib - pom may have changed. */
573 stsch(sch
->schid
, &sch
->schib
);
574 /* Update lpm with verified path mask. */
576 /* Repeat path verification? */
577 if (cdev
->private->flags
.doverify
) {
578 cdev
->private->flags
.doverify
= 0;
579 ccw_device_verify_start(cdev
);
583 case -EOPNOTSUPP
: /* path grouping not supported, just set online. */
584 cdev
->private->options
.pgroup
= 0;
586 ccw_device_done(cdev
, DEV_STATE_ONLINE
);
587 /* Deliver fake irb to device driver, if needed. */
588 if (cdev
->private->flags
.fake_irb
) {
589 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
590 cdev
->private->irb
.scsw
.cc
= 1;
591 cdev
->private->irb
.scsw
.fctl
= SCSW_FCTL_START_FUNC
;
592 cdev
->private->irb
.scsw
.actl
= SCSW_ACTL_START_PEND
;
593 cdev
->private->irb
.scsw
.stctl
= SCSW_STCTL_STATUS_PEND
;
594 cdev
->private->flags
.fake_irb
= 0;
596 cdev
->handler(cdev
, cdev
->private->intparm
,
597 &cdev
->private->irb
);
598 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
602 /* Reset oper notify indication after verify error. */
603 cdev
->private->flags
.donotify
= 0;
604 ccw_device_done(cdev
, DEV_STATE_BOXED
);
607 /* Reset oper notify indication after verify error. */
608 cdev
->private->flags
.donotify
= 0;
609 PREPARE_WORK(&cdev
->private->kick_work
,
610 ccw_device_nopath_notify
, cdev
);
611 queue_work(ccw_device_notify_work
, &cdev
->private->kick_work
);
612 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
621 ccw_device_online(struct ccw_device
*cdev
)
623 struct subchannel
*sch
;
626 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
) &&
627 (cdev
->private->state
!= DEV_STATE_BOXED
))
629 sch
= to_subchannel(cdev
->dev
.parent
);
630 if (css_init_done
&& !get_device(&cdev
->dev
))
632 ret
= cio_enable_subchannel(sch
, sch
->schib
.pmcw
.isc
);
634 /* Couldn't enable the subchannel for i/o. Sick device. */
636 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
639 /* Do we want to do path grouping? */
640 if (!cdev
->private->options
.pgroup
) {
641 /* Start initial path verification. */
642 cdev
->private->state
= DEV_STATE_VERIFY
;
643 cdev
->private->flags
.doverify
= 0;
644 ccw_device_verify_start(cdev
);
647 /* Do a SensePGID first. */
648 cdev
->private->state
= DEV_STATE_SENSE_PGID
;
649 ccw_device_sense_pgid_start(cdev
);
654 ccw_device_disband_done(struct ccw_device
*cdev
, int err
)
658 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
661 ccw_device_done(cdev
, DEV_STATE_BOXED
);
664 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
673 ccw_device_offline(struct ccw_device
*cdev
)
675 struct subchannel
*sch
;
677 sch
= to_subchannel(cdev
->dev
.parent
);
678 if (stsch(sch
->schid
, &sch
->schib
) || !sch
->schib
.pmcw
.dnv
)
680 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
681 if (sch
->schib
.scsw
.actl
!= 0)
685 if (sch
->schib
.scsw
.actl
!= 0)
687 /* Are we doing path grouping? */
688 if (!cdev
->private->options
.pgroup
) {
689 /* No, set state offline immediately. */
690 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
693 /* Start Set Path Group commands. */
694 cdev
->private->state
= DEV_STATE_DISBAND_PGID
;
695 ccw_device_disband_start(cdev
);
700 * Handle timeout in device online/offline process.
703 ccw_device_onoff_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
707 ret
= ccw_device_cancel_halt_clear(cdev
);
710 ccw_device_done(cdev
, DEV_STATE_BOXED
);
713 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
716 ccw_device_set_timeout(cdev
, 3*HZ
);
721 * Handle not oper event in device recognition.
724 ccw_device_recog_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
726 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
730 * Handle not operational event while offline.
733 ccw_device_offline_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
735 struct subchannel
*sch
;
737 cdev
->private->state
= DEV_STATE_NOT_OPER
;
738 sch
= to_subchannel(cdev
->dev
.parent
);
739 if (get_device(&cdev
->dev
)) {
740 PREPARE_WORK(&cdev
->private->kick_work
,
741 ccw_device_call_sch_unregister
, cdev
);
742 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
744 wake_up(&cdev
->private->wait_q
);
748 * Handle not operational event while online.
751 ccw_device_online_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
753 struct subchannel
*sch
;
755 sch
= to_subchannel(cdev
->dev
.parent
);
756 if (sch
->driver
->notify
&&
757 sch
->driver
->notify(&sch
->dev
, sch
->lpm
? CIO_GONE
: CIO_NO_PATH
)) {
758 ccw_device_set_timeout(cdev
, 0);
759 cdev
->private->flags
.fake_irb
= 0;
760 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
761 wake_up(&cdev
->private->wait_q
);
764 cdev
->private->state
= DEV_STATE_NOT_OPER
;
765 cio_disable_subchannel(sch
);
766 if (sch
->schib
.scsw
.actl
!= 0) {
767 // FIXME: not-oper indication to device driver ?
768 ccw_device_call_handler(cdev
);
770 if (get_device(&cdev
->dev
)) {
771 PREPARE_WORK(&cdev
->private->kick_work
,
772 ccw_device_call_sch_unregister
, cdev
);
773 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
775 wake_up(&cdev
->private->wait_q
);
779 * Handle path verification event.
782 ccw_device_online_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
784 struct subchannel
*sch
;
786 if (cdev
->private->state
== DEV_STATE_W4SENSE
) {
787 cdev
->private->flags
.doverify
= 1;
790 sch
= to_subchannel(cdev
->dev
.parent
);
792 * Since we might not just be coming from an interrupt from the
793 * subchannel we have to update the schib.
795 stsch(sch
->schid
, &sch
->schib
);
797 if (sch
->schib
.scsw
.actl
!= 0 ||
798 (sch
->schib
.scsw
.stctl
& SCSW_STCTL_STATUS_PEND
) ||
799 (cdev
->private->irb
.scsw
.stctl
& SCSW_STCTL_STATUS_PEND
)) {
801 * No final status yet or final status not yet delivered
802 * to the device driver. Can't do path verfication now,
803 * delay until final status was delivered.
805 cdev
->private->flags
.doverify
= 1;
808 /* Device is idle, we can do the path verification. */
809 cdev
->private->state
= DEV_STATE_VERIFY
;
810 cdev
->private->flags
.doverify
= 0;
811 ccw_device_verify_start(cdev
);
815 * Got an interrupt for a normal io (state online).
818 ccw_device_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
822 irb
= (struct irb
*) __LC_IRB
;
823 /* Check for unsolicited interrupt. */
824 if ((irb
->scsw
.stctl
==
825 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
))
826 && (!irb
->scsw
.cc
)) {
827 if ((irb
->scsw
.dstat
& DEV_STAT_UNIT_CHECK
) &&
828 !irb
->esw
.esw0
.erw
.cons
) {
829 /* Unit check but no sense data. Need basic sense. */
830 if (ccw_device_do_sense(cdev
, irb
) != 0)
831 goto call_handler_unsol
;
832 memcpy(&cdev
->private->irb
, irb
, sizeof(struct irb
));
833 cdev
->private->state
= DEV_STATE_W4SENSE
;
834 cdev
->private->intparm
= 0;
839 cdev
->handler (cdev
, 0, irb
);
842 /* Accumulate status and find out if a basic sense is needed. */
843 ccw_device_accumulate_irb(cdev
, irb
);
844 if (cdev
->private->flags
.dosense
) {
845 if (ccw_device_do_sense(cdev
, irb
) == 0) {
846 cdev
->private->state
= DEV_STATE_W4SENSE
;
850 /* Call the handler. */
851 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
852 /* Start delayed path verification. */
853 ccw_device_online_verify(cdev
, 0);
857 * Got an timeout in online state.
860 ccw_device_online_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
864 ccw_device_set_timeout(cdev
, 0);
865 ret
= ccw_device_cancel_halt_clear(cdev
);
867 ccw_device_set_timeout(cdev
, 3*HZ
);
868 cdev
->private->state
= DEV_STATE_TIMEOUT_KILL
;
871 if (ret
== -ENODEV
) {
872 struct subchannel
*sch
;
874 sch
= to_subchannel(cdev
->dev
.parent
);
876 PREPARE_WORK(&cdev
->private->kick_work
,
877 ccw_device_nopath_notify
, cdev
);
878 queue_work(ccw_device_notify_work
,
879 &cdev
->private->kick_work
);
881 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
882 } else if (cdev
->handler
)
883 cdev
->handler(cdev
, cdev
->private->intparm
,
884 ERR_PTR(-ETIMEDOUT
));
888 * Got an interrupt for a basic sense.
891 ccw_device_w4sense(struct ccw_device
*cdev
, enum dev_event dev_event
)
895 irb
= (struct irb
*) __LC_IRB
;
896 /* Check for unsolicited interrupt. */
897 if (irb
->scsw
.stctl
==
898 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
)) {
899 if (irb
->scsw
.cc
== 1)
900 /* Basic sense hasn't started. Try again. */
901 ccw_device_do_sense(cdev
, irb
);
903 printk(KERN_INFO
"Huh? %s(%s): unsolicited "
905 __FUNCTION__
, cdev
->dev
.bus_id
);
907 cdev
->handler (cdev
, 0, irb
);
912 * Check if a halt or clear has been issued in the meanwhile. If yes,
913 * only deliver the halt/clear interrupt to the device driver as if it
914 * had killed the original request.
916 if (irb
->scsw
.fctl
& (SCSW_FCTL_CLEAR_FUNC
| SCSW_FCTL_HALT_FUNC
)) {
917 /* Retry Basic Sense if requested. */
918 if (cdev
->private->flags
.intretry
) {
919 cdev
->private->flags
.intretry
= 0;
920 ccw_device_do_sense(cdev
, irb
);
923 cdev
->private->flags
.dosense
= 0;
924 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
925 ccw_device_accumulate_irb(cdev
, irb
);
928 /* Add basic sense info to irb. */
929 ccw_device_accumulate_basic_sense(cdev
, irb
);
930 if (cdev
->private->flags
.dosense
) {
931 /* Another basic sense is needed. */
932 ccw_device_do_sense(cdev
, irb
);
936 cdev
->private->state
= DEV_STATE_ONLINE
;
937 /* Call the handler. */
938 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
939 /* Start delayed path verification. */
940 ccw_device_online_verify(cdev
, 0);
944 ccw_device_clear_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
948 irb
= (struct irb
*) __LC_IRB
;
949 /* Accumulate status. We don't do basic sense. */
950 ccw_device_accumulate_irb(cdev
, irb
);
951 /* Remember to clear irb to avoid residuals. */
952 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
953 /* Try to start delayed device verification. */
954 ccw_device_online_verify(cdev
, 0);
955 /* Note: Don't call handler for cio initiated clear! */
959 ccw_device_killing_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
961 struct subchannel
*sch
;
963 sch
= to_subchannel(cdev
->dev
.parent
);
964 ccw_device_set_timeout(cdev
, 0);
965 /* OK, i/o is dead now. Call interrupt handler. */
966 cdev
->private->state
= DEV_STATE_ONLINE
;
968 cdev
->handler(cdev
, cdev
->private->intparm
,
971 PREPARE_WORK(&cdev
->private->kick_work
,
972 ccw_device_nopath_notify
, cdev
);
973 queue_work(ccw_device_notify_work
, &cdev
->private->kick_work
);
974 } else if (cdev
->private->flags
.doverify
)
975 /* Start delayed path verification. */
976 ccw_device_online_verify(cdev
, 0);
980 ccw_device_killing_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
984 ret
= ccw_device_cancel_halt_clear(cdev
);
986 ccw_device_set_timeout(cdev
, 3*HZ
);
989 if (ret
== -ENODEV
) {
990 struct subchannel
*sch
;
992 sch
= to_subchannel(cdev
->dev
.parent
);
994 PREPARE_WORK(&cdev
->private->kick_work
,
995 ccw_device_nopath_notify
, cdev
);
996 queue_work(ccw_device_notify_work
,
997 &cdev
->private->kick_work
);
999 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1002 //FIXME: Can we get here?
1003 cdev
->private->state
= DEV_STATE_ONLINE
;
1005 cdev
->handler(cdev
, cdev
->private->intparm
,
1009 void device_kill_io(struct subchannel
*sch
)
1012 struct ccw_device
*cdev
;
1014 cdev
= sch
->dev
.driver_data
;
1015 ret
= ccw_device_cancel_halt_clear(cdev
);
1016 if (ret
== -EBUSY
) {
1017 ccw_device_set_timeout(cdev
, 3*HZ
);
1018 cdev
->private->state
= DEV_STATE_TIMEOUT_KILL
;
1021 if (ret
== -ENODEV
) {
1023 PREPARE_WORK(&cdev
->private->kick_work
,
1024 ccw_device_nopath_notify
, cdev
);
1025 queue_work(ccw_device_notify_work
,
1026 &cdev
->private->kick_work
);
1028 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
1032 cdev
->handler(cdev
, cdev
->private->intparm
,
1035 PREPARE_WORK(&cdev
->private->kick_work
,
1036 ccw_device_nopath_notify
, cdev
);
1037 queue_work(ccw_device_notify_work
, &cdev
->private->kick_work
);
1039 /* Start delayed path verification. */
1040 ccw_device_online_verify(cdev
, 0);
1044 ccw_device_delay_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
1046 /* Start verification after current task finished. */
1047 cdev
->private->flags
.doverify
= 1;
1051 ccw_device_stlck_done(struct ccw_device
*cdev
, enum dev_event dev_event
)
1055 switch (dev_event
) {
1056 case DEV_EVENT_INTERRUPT
:
1057 irb
= (struct irb
*) __LC_IRB
;
1058 /* Check for unsolicited interrupt. */
1059 if ((irb
->scsw
.stctl
==
1060 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
)) &&
1062 /* FIXME: we should restart stlck here, but this
1063 * is extremely unlikely ... */
1066 ccw_device_accumulate_irb(cdev
, irb
);
1067 /* We don't care about basic sense etc. */
1069 default: /* timeout */
1073 wake_up(&cdev
->private->wait_q
);
1077 ccw_device_start_id(struct ccw_device
*cdev
, enum dev_event dev_event
)
1079 struct subchannel
*sch
;
1081 sch
= to_subchannel(cdev
->dev
.parent
);
1082 if (cio_enable_subchannel(sch
, sch
->schib
.pmcw
.isc
) != 0)
1083 /* Couldn't enable the subchannel for i/o. Sick device. */
1086 /* After 60s the device recognition is considered to have failed. */
1087 ccw_device_set_timeout(cdev
, 60*HZ
);
1089 cdev
->private->state
= DEV_STATE_DISCONNECTED_SENSE_ID
;
1090 ccw_device_sense_id_start(cdev
);
1094 device_trigger_reprobe(struct subchannel
*sch
)
1096 struct ccw_device
*cdev
;
1098 if (!sch
->dev
.driver_data
)
1100 cdev
= sch
->dev
.driver_data
;
1101 if (cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
1104 /* Update some values. */
1105 if (stsch(sch
->schid
, &sch
->schib
))
1109 * The pim, pam, pom values may not be accurate, but they are the best
1110 * we have before performing device selection :/
1112 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1113 /* Re-set some bits in the pmcw that were lost. */
1114 sch
->schib
.pmcw
.isc
= 3;
1115 sch
->schib
.pmcw
.csense
= 1;
1116 sch
->schib
.pmcw
.ena
= 0;
1117 if ((sch
->lpm
& (sch
->lpm
- 1)) != 0)
1118 sch
->schib
.pmcw
.mp
= 1;
1119 sch
->schib
.pmcw
.intparm
= (__u32
)(unsigned long)sch
;
1120 /* We should also udate ssd info, but this has to wait. */
1121 ccw_device_start_id(cdev
, 0);
1125 ccw_device_offline_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
1127 struct subchannel
*sch
;
1129 sch
= to_subchannel(cdev
->dev
.parent
);
1131 * An interrupt in state offline means a previous disable was not
1132 * successful. Try again.
1134 cio_disable_subchannel(sch
);
1138 ccw_device_change_cmfstate(struct ccw_device
*cdev
, enum dev_event dev_event
)
1140 retry_set_schib(cdev
);
1141 cdev
->private->state
= DEV_STATE_ONLINE
;
1142 dev_fsm_event(cdev
, dev_event
);
1145 static void ccw_device_update_cmfblock(struct ccw_device
*cdev
,
1146 enum dev_event dev_event
)
1148 cmf_retry_copy_block(cdev
);
1149 cdev
->private->state
= DEV_STATE_ONLINE
;
1150 dev_fsm_event(cdev
, dev_event
);
1154 ccw_device_quiesce_done(struct ccw_device
*cdev
, enum dev_event dev_event
)
1156 ccw_device_set_timeout(cdev
, 0);
1157 if (dev_event
== DEV_EVENT_NOTOPER
)
1158 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1160 cdev
->private->state
= DEV_STATE_OFFLINE
;
1161 wake_up(&cdev
->private->wait_q
);
1165 ccw_device_quiesce_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
1169 ret
= ccw_device_cancel_halt_clear(cdev
);
1172 cdev
->private->state
= DEV_STATE_OFFLINE
;
1173 wake_up(&cdev
->private->wait_q
);
1176 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1177 wake_up(&cdev
->private->wait_q
);
1180 ccw_device_set_timeout(cdev
, HZ
/10);
1185 * No operation action. This is used e.g. to ignore a timeout event in
1189 ccw_device_nop(struct ccw_device
*cdev
, enum dev_event dev_event
)
1194 * Bug operation action.
1197 ccw_device_bug(struct ccw_device
*cdev
, enum dev_event dev_event
)
1199 printk(KERN_EMERG
"dev_jumptable[%i][%i] == NULL\n",
1200 cdev
->private->state
, dev_event
);
1205 * device statemachine
1207 fsm_func_t
*dev_jumptable
[NR_DEV_STATES
][NR_DEV_EVENTS
] = {
1208 [DEV_STATE_NOT_OPER
] = {
1209 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1210 [DEV_EVENT_INTERRUPT
] = ccw_device_bug
,
1211 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1212 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1214 [DEV_STATE_SENSE_PGID
] = {
1215 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1216 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_pgid_irq
,
1217 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1218 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1220 [DEV_STATE_SENSE_ID
] = {
1221 [DEV_EVENT_NOTOPER
] = ccw_device_recog_notoper
,
1222 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_id_irq
,
1223 [DEV_EVENT_TIMEOUT
] = ccw_device_recog_timeout
,
1224 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1226 [DEV_STATE_OFFLINE
] = {
1227 [DEV_EVENT_NOTOPER
] = ccw_device_offline_notoper
,
1228 [DEV_EVENT_INTERRUPT
] = ccw_device_offline_irq
,
1229 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1230 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1232 [DEV_STATE_VERIFY
] = {
1233 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1234 [DEV_EVENT_INTERRUPT
] = ccw_device_verify_irq
,
1235 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1236 [DEV_EVENT_VERIFY
] = ccw_device_delay_verify
,
1238 [DEV_STATE_ONLINE
] = {
1239 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1240 [DEV_EVENT_INTERRUPT
] = ccw_device_irq
,
1241 [DEV_EVENT_TIMEOUT
] = ccw_device_online_timeout
,
1242 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1244 [DEV_STATE_W4SENSE
] = {
1245 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1246 [DEV_EVENT_INTERRUPT
] = ccw_device_w4sense
,
1247 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1248 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1250 [DEV_STATE_DISBAND_PGID
] = {
1251 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1252 [DEV_EVENT_INTERRUPT
] = ccw_device_disband_irq
,
1253 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1254 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1256 [DEV_STATE_BOXED
] = {
1257 [DEV_EVENT_NOTOPER
] = ccw_device_offline_notoper
,
1258 [DEV_EVENT_INTERRUPT
] = ccw_device_stlck_done
,
1259 [DEV_EVENT_TIMEOUT
] = ccw_device_stlck_done
,
1260 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1262 /* states to wait for i/o completion before doing something */
1263 [DEV_STATE_CLEAR_VERIFY
] = {
1264 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1265 [DEV_EVENT_INTERRUPT
] = ccw_device_clear_verify
,
1266 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1267 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1269 [DEV_STATE_TIMEOUT_KILL
] = {
1270 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1271 [DEV_EVENT_INTERRUPT
] = ccw_device_killing_irq
,
1272 [DEV_EVENT_TIMEOUT
] = ccw_device_killing_timeout
,
1273 [DEV_EVENT_VERIFY
] = ccw_device_nop
, //FIXME
1275 [DEV_STATE_QUIESCE
] = {
1276 [DEV_EVENT_NOTOPER
] = ccw_device_quiesce_done
,
1277 [DEV_EVENT_INTERRUPT
] = ccw_device_quiesce_done
,
1278 [DEV_EVENT_TIMEOUT
] = ccw_device_quiesce_timeout
,
1279 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1281 /* special states for devices gone not operational */
1282 [DEV_STATE_DISCONNECTED
] = {
1283 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1284 [DEV_EVENT_INTERRUPT
] = ccw_device_start_id
,
1285 [DEV_EVENT_TIMEOUT
] = ccw_device_bug
,
1286 [DEV_EVENT_VERIFY
] = ccw_device_start_id
,
1288 [DEV_STATE_DISCONNECTED_SENSE_ID
] = {
1289 [DEV_EVENT_NOTOPER
] = ccw_device_recog_notoper
,
1290 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_id_irq
,
1291 [DEV_EVENT_TIMEOUT
] = ccw_device_recog_timeout
,
1292 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1294 [DEV_STATE_CMFCHANGE
] = {
1295 [DEV_EVENT_NOTOPER
] = ccw_device_change_cmfstate
,
1296 [DEV_EVENT_INTERRUPT
] = ccw_device_change_cmfstate
,
1297 [DEV_EVENT_TIMEOUT
] = ccw_device_change_cmfstate
,
1298 [DEV_EVENT_VERIFY
] = ccw_device_change_cmfstate
,
1300 [DEV_STATE_CMFUPDATE
] = {
1301 [DEV_EVENT_NOTOPER
] = ccw_device_update_cmfblock
,
1302 [DEV_EVENT_INTERRUPT
] = ccw_device_update_cmfblock
,
1303 [DEV_EVENT_TIMEOUT
] = ccw_device_update_cmfblock
,
1304 [DEV_EVENT_VERIFY
] = ccw_device_update_cmfblock
,
1309 * io_subchannel_irq is called for "real" interrupts or for status
1310 * pending conditions on msch.
1313 io_subchannel_irq (struct device
*pdev
)
1315 struct ccw_device
*cdev
;
1317 cdev
= to_subchannel(pdev
)->dev
.driver_data
;
1319 CIO_TRACE_EVENT (3, "IRQ");
1320 CIO_TRACE_EVENT (3, pdev
->bus_id
);
1322 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1325 EXPORT_SYMBOL_GPL(ccw_device_set_timeout
);