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
)
148 /* Not operational -> 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.
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 PREPARE_WORK(&cdev
->private->kick_work
,
196 ccw_device_do_unreg_rereg
);
197 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
200 cdev
->private->flags
.donotify
= 1;
205 * The machine won't give us any notification by machine check if a chpid has
206 * been varied online on the SE so we have to find out by magic (i. e. driving
207 * the channel subsystem to device selection and updating our path masks).
210 __recover_lost_chpids(struct subchannel
*sch
, int old_lpm
)
214 for (i
= 0; i
<8; i
++) {
216 if (!(sch
->lpm
& mask
))
220 chpid_is_actually_online(sch
->schib
.pmcw
.chpid
[i
]);
225 * Stop device recognition.
228 ccw_device_recog_done(struct ccw_device
*cdev
, int state
)
230 struct subchannel
*sch
;
231 int notify
, old_lpm
, same_dev
;
233 sch
= to_subchannel(cdev
->dev
.parent
);
235 ccw_device_set_timeout(cdev
, 0);
236 cio_disable_subchannel(sch
);
238 * Now that we tried recognition, we have performed device selection
239 * through ssch() and the path information is up to date.
242 stsch(sch
->schid
, &sch
->schib
);
243 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
244 /* Check since device may again have become not operational. */
245 if (!sch
->schib
.pmcw
.dnv
)
246 state
= DEV_STATE_NOT_OPER
;
247 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
)
248 /* Force reprobe on all chpids. */
250 if (sch
->lpm
!= old_lpm
)
251 __recover_lost_chpids(sch
, old_lpm
);
252 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
) {
253 if (state
== DEV_STATE_NOT_OPER
) {
254 cdev
->private->flags
.recog_done
= 1;
255 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
258 /* Boxed devices don't need extra treatment. */
261 same_dev
= 0; /* Keep the compiler quiet... */
263 case DEV_STATE_NOT_OPER
:
264 CIO_DEBUG(KERN_WARNING
, 2,
265 "SenseID : unknown device %04x on subchannel "
266 "0.%x.%04x\n", cdev
->private->dev_id
.devno
,
267 sch
->schid
.ssid
, sch
->schid
.sch_no
);
269 case DEV_STATE_OFFLINE
:
270 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
) {
271 same_dev
= ccw_device_handle_oper(cdev
);
274 /* fill out sense information */
275 memset(&cdev
->id
, 0, sizeof(cdev
->id
));
276 cdev
->id
.cu_type
= cdev
->private->senseid
.cu_type
;
277 cdev
->id
.cu_model
= cdev
->private->senseid
.cu_model
;
278 cdev
->id
.dev_type
= cdev
->private->senseid
.dev_type
;
279 cdev
->id
.dev_model
= cdev
->private->senseid
.dev_model
;
281 cdev
->private->state
= DEV_STATE_OFFLINE
;
283 /* Get device online again. */
284 ccw_device_online(cdev
);
285 wake_up(&cdev
->private->wait_q
);
289 /* Issue device info message. */
290 CIO_DEBUG(KERN_INFO
, 2, "SenseID : device 0.%x.%04x reports: "
291 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
293 cdev
->private->dev_id
.ssid
,
294 cdev
->private->dev_id
.devno
,
295 cdev
->id
.cu_type
, cdev
->id
.cu_model
,
296 cdev
->id
.dev_type
, cdev
->id
.dev_model
);
298 case DEV_STATE_BOXED
:
299 CIO_DEBUG(KERN_WARNING
, 2,
300 "SenseID : boxed device %04x on subchannel "
301 "0.%x.%04x\n", cdev
->private->dev_id
.devno
,
302 sch
->schid
.ssid
, sch
->schid
.sch_no
);
305 cdev
->private->state
= state
;
306 io_subchannel_recog_done(cdev
);
307 if (state
!= DEV_STATE_NOT_OPER
)
308 wake_up(&cdev
->private->wait_q
);
312 * Function called from device_id.c after sense id has completed.
315 ccw_device_sense_id_done(struct ccw_device
*cdev
, int err
)
319 ccw_device_recog_done(cdev
, DEV_STATE_OFFLINE
);
321 case -ETIME
: /* Sense id stopped by timeout. */
322 ccw_device_recog_done(cdev
, DEV_STATE_BOXED
);
325 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
331 ccw_device_oper_notify(struct work_struct
*work
)
333 struct ccw_device_private
*priv
;
334 struct ccw_device
*cdev
;
335 struct subchannel
*sch
;
339 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
341 spin_lock_irqsave(cdev
->ccwlock
, flags
);
342 sch
= to_subchannel(cdev
->dev
.parent
);
343 if (sch
->driver
&& sch
->driver
->notify
) {
344 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
345 ret
= sch
->driver
->notify(&sch
->dev
, CIO_OPER
);
346 spin_lock_irqsave(cdev
->ccwlock
, flags
);
350 /* Reenable channel measurements, if needed. */
351 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
353 spin_lock_irqsave(cdev
->ccwlock
, flags
);
354 wake_up(&cdev
->private->wait_q
);
356 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
358 /* Driver doesn't want device back. */
359 ccw_device_do_unreg_rereg(work
);
363 * Finished with online/offline processing.
366 ccw_device_done(struct ccw_device
*cdev
, int state
)
368 struct subchannel
*sch
;
370 sch
= to_subchannel(cdev
->dev
.parent
);
372 ccw_device_set_timeout(cdev
, 0);
374 if (state
!= DEV_STATE_ONLINE
)
375 cio_disable_subchannel(sch
);
377 /* Reset device status. */
378 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
380 cdev
->private->state
= state
;
383 if (state
== DEV_STATE_BOXED
)
384 CIO_DEBUG(KERN_WARNING
, 2,
385 "Boxed device %04x on subchannel %04x\n",
386 cdev
->private->dev_id
.devno
, sch
->schid
.sch_no
);
388 if (cdev
->private->flags
.donotify
) {
389 cdev
->private->flags
.donotify
= 0;
390 PREPARE_WORK(&cdev
->private->kick_work
, ccw_device_oper_notify
);
391 queue_work(ccw_device_notify_work
, &cdev
->private->kick_work
);
393 wake_up(&cdev
->private->wait_q
);
395 if (css_init_done
&& state
!= DEV_STATE_ONLINE
)
396 put_device (&cdev
->dev
);
399 static int cmp_pgid(struct pgid
*p1
, struct pgid
*p2
)
407 return memcmp(c1
+ 1, c2
+ 1, sizeof(struct pgid
) - 1);
410 static void __ccw_device_get_common_pgid(struct ccw_device
*cdev
)
416 for (i
= 0; i
< 8; i
++) {
417 if (cdev
->private->pgid
[i
].inf
.ps
.state1
== SNID_STATE1_RESET
)
420 if (cdev
->private->pgid
[last
].inf
.ps
.state1
==
422 /* First non-zero PGID */
426 if (cmp_pgid(&cdev
->private->pgid
[i
],
427 &cdev
->private->pgid
[last
]) == 0)
428 /* Non-conflicting PGIDs */
431 /* PGID mismatch, can't pathgroup. */
432 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
433 "0.%x.%04x, can't pathgroup\n",
434 cdev
->private->dev_id
.ssid
,
435 cdev
->private->dev_id
.devno
);
436 cdev
->private->options
.pgroup
= 0;
439 if (cdev
->private->pgid
[last
].inf
.ps
.state1
==
441 /* No previous pgid found */
442 memcpy(&cdev
->private->pgid
[0], &css
[0]->global_pgid
,
443 sizeof(struct pgid
));
445 /* Use existing pgid */
446 memcpy(&cdev
->private->pgid
[0], &cdev
->private->pgid
[last
],
447 sizeof(struct pgid
));
451 * Function called from device_pgid.c after sense path ground has completed.
454 ccw_device_sense_pgid_done(struct ccw_device
*cdev
, int err
)
456 struct subchannel
*sch
;
458 sch
= to_subchannel(cdev
->dev
.parent
);
460 case -EOPNOTSUPP
: /* path grouping not supported, use nop instead. */
461 cdev
->private->options
.pgroup
= 0;
463 case 0: /* success */
464 case -EACCES
: /* partial success, some paths not operational */
465 /* Check if all pgids are equal or 0. */
466 __ccw_device_get_common_pgid(cdev
);
468 case -ETIME
: /* Sense path group id stopped by timeout. */
469 case -EUSERS
: /* device is reserved for someone else. */
470 ccw_device_done(cdev
, DEV_STATE_BOXED
);
473 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
476 /* Start Path Group verification. */
477 cdev
->private->state
= DEV_STATE_VERIFY
;
478 cdev
->private->flags
.doverify
= 0;
479 ccw_device_verify_start(cdev
);
483 * Start device recognition.
486 ccw_device_recognition(struct ccw_device
*cdev
)
488 struct subchannel
*sch
;
491 if ((cdev
->private->state
!= DEV_STATE_NOT_OPER
) &&
492 (cdev
->private->state
!= DEV_STATE_BOXED
))
494 sch
= to_subchannel(cdev
->dev
.parent
);
495 ret
= cio_enable_subchannel(sch
, sch
->schib
.pmcw
.isc
);
497 /* Couldn't enable the subchannel for i/o. Sick device. */
500 /* After 60s the device recognition is considered to have failed. */
501 ccw_device_set_timeout(cdev
, 60*HZ
);
504 * We used to start here with a sense pgid to find out whether a device
505 * is locked by someone else. Unfortunately, the sense pgid command
506 * code has other meanings on devices predating the path grouping
507 * algorithm, so we start with sense id and box the device after an
508 * timeout (or if sense pgid during path verification detects the device
509 * is locked, as may happen on newer devices).
511 cdev
->private->flags
.recog_done
= 0;
512 cdev
->private->state
= DEV_STATE_SENSE_ID
;
513 ccw_device_sense_id_start(cdev
);
518 * Handle timeout in device recognition.
521 ccw_device_recog_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
525 ret
= ccw_device_cancel_halt_clear(cdev
);
528 ccw_device_recog_done(cdev
, DEV_STATE_BOXED
);
531 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
534 ccw_device_set_timeout(cdev
, 3*HZ
);
540 ccw_device_nopath_notify(struct work_struct
*work
)
542 struct ccw_device_private
*priv
;
543 struct ccw_device
*cdev
;
544 struct subchannel
*sch
;
548 priv
= container_of(work
, struct ccw_device_private
, kick_work
);
550 spin_lock_irqsave(cdev
->ccwlock
, flags
);
551 sch
= to_subchannel(cdev
->dev
.parent
);
555 if (sch
->driver
&& sch
->driver
->notify
) {
556 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
557 ret
= sch
->driver
->notify(&sch
->dev
, CIO_NO_PATH
);
558 spin_lock_irqsave(cdev
->ccwlock
, flags
);
562 if (get_device(&sch
->dev
)) {
563 /* Driver doesn't want to keep device. */
564 cio_disable_subchannel(sch
);
565 if (get_device(&cdev
->dev
)) {
566 PREPARE_WORK(&cdev
->private->kick_work
,
567 ccw_device_call_sch_unregister
);
568 queue_work(ccw_device_work
,
569 &cdev
->private->kick_work
);
571 put_device(&sch
->dev
);
574 cio_disable_subchannel(sch
);
575 ccw_device_set_timeout(cdev
, 0);
576 cdev
->private->flags
.fake_irb
= 0;
577 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
578 wake_up(&cdev
->private->wait_q
);
581 spin_unlock_irqrestore(cdev
->ccwlock
, flags
);
585 ccw_device_verify_done(struct ccw_device
*cdev
, int err
)
587 struct subchannel
*sch
;
589 sch
= to_subchannel(cdev
->dev
.parent
);
590 /* Update schib - pom may have changed. */
591 stsch(sch
->schid
, &sch
->schib
);
592 /* Update lpm with verified path mask. */
594 /* Repeat path verification? */
595 if (cdev
->private->flags
.doverify
) {
596 cdev
->private->flags
.doverify
= 0;
597 ccw_device_verify_start(cdev
);
601 case -EOPNOTSUPP
: /* path grouping not supported, just set online. */
602 cdev
->private->options
.pgroup
= 0;
604 ccw_device_done(cdev
, DEV_STATE_ONLINE
);
605 /* Deliver fake irb to device driver, if needed. */
606 if (cdev
->private->flags
.fake_irb
) {
607 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
608 cdev
->private->irb
.scsw
.cc
= 1;
609 cdev
->private->irb
.scsw
.fctl
= SCSW_FCTL_START_FUNC
;
610 cdev
->private->irb
.scsw
.actl
= SCSW_ACTL_START_PEND
;
611 cdev
->private->irb
.scsw
.stctl
= SCSW_STCTL_STATUS_PEND
;
612 cdev
->private->flags
.fake_irb
= 0;
614 cdev
->handler(cdev
, cdev
->private->intparm
,
615 &cdev
->private->irb
);
616 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
620 /* Reset oper notify indication after verify error. */
621 cdev
->private->flags
.donotify
= 0;
622 ccw_device_done(cdev
, DEV_STATE_BOXED
);
625 /* Reset oper notify indication after verify error. */
626 cdev
->private->flags
.donotify
= 0;
628 PREPARE_WORK(&cdev
->private->kick_work
,
629 ccw_device_nopath_notify
);
630 queue_work(ccw_device_notify_work
,
631 &cdev
->private->kick_work
);
633 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
642 ccw_device_online(struct ccw_device
*cdev
)
644 struct subchannel
*sch
;
647 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
) &&
648 (cdev
->private->state
!= DEV_STATE_BOXED
))
650 sch
= to_subchannel(cdev
->dev
.parent
);
651 if (css_init_done
&& !get_device(&cdev
->dev
))
653 ret
= cio_enable_subchannel(sch
, sch
->schib
.pmcw
.isc
);
655 /* Couldn't enable the subchannel for i/o. Sick device. */
657 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
660 /* Do we want to do path grouping? */
661 if (!cdev
->private->options
.pgroup
) {
662 /* Start initial path verification. */
663 cdev
->private->state
= DEV_STATE_VERIFY
;
664 cdev
->private->flags
.doverify
= 0;
665 ccw_device_verify_start(cdev
);
668 /* Do a SensePGID first. */
669 cdev
->private->state
= DEV_STATE_SENSE_PGID
;
670 ccw_device_sense_pgid_start(cdev
);
675 ccw_device_disband_done(struct ccw_device
*cdev
, int err
)
679 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
682 ccw_device_done(cdev
, DEV_STATE_BOXED
);
685 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
694 ccw_device_offline(struct ccw_device
*cdev
)
696 struct subchannel
*sch
;
698 if (ccw_device_is_orphan(cdev
)) {
699 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
702 sch
= to_subchannel(cdev
->dev
.parent
);
703 if (stsch(sch
->schid
, &sch
->schib
) || !sch
->schib
.pmcw
.dnv
)
705 if (cdev
->private->state
!= DEV_STATE_ONLINE
) {
706 if (sch
->schib
.scsw
.actl
!= 0)
710 if (sch
->schib
.scsw
.actl
!= 0)
712 /* Are we doing path grouping? */
713 if (!cdev
->private->options
.pgroup
) {
714 /* No, set state offline immediately. */
715 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
718 /* Start Set Path Group commands. */
719 cdev
->private->state
= DEV_STATE_DISBAND_PGID
;
720 ccw_device_disband_start(cdev
);
725 * Handle timeout in device online/offline process.
728 ccw_device_onoff_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
732 ret
= ccw_device_cancel_halt_clear(cdev
);
735 ccw_device_done(cdev
, DEV_STATE_BOXED
);
738 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
741 ccw_device_set_timeout(cdev
, 3*HZ
);
746 * Handle not oper event in device recognition.
749 ccw_device_recog_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
751 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
755 * Handle not operational event while offline.
758 ccw_device_offline_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
760 struct subchannel
*sch
;
762 cdev
->private->state
= DEV_STATE_NOT_OPER
;
763 sch
= to_subchannel(cdev
->dev
.parent
);
764 if (get_device(&cdev
->dev
)) {
765 PREPARE_WORK(&cdev
->private->kick_work
,
766 ccw_device_call_sch_unregister
);
767 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
769 wake_up(&cdev
->private->wait_q
);
773 * Handle not operational event while online.
776 ccw_device_online_notoper(struct ccw_device
*cdev
, enum dev_event dev_event
)
778 struct subchannel
*sch
;
781 sch
= to_subchannel(cdev
->dev
.parent
);
782 if (sch
->driver
->notify
) {
783 spin_unlock_irq(cdev
->ccwlock
);
784 ret
= sch
->driver
->notify(&sch
->dev
,
785 sch
->lpm
? CIO_GONE
: CIO_NO_PATH
);
786 spin_lock_irq(cdev
->ccwlock
);
790 ccw_device_set_timeout(cdev
, 0);
791 cdev
->private->flags
.fake_irb
= 0;
792 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
793 wake_up(&cdev
->private->wait_q
);
796 cdev
->private->state
= DEV_STATE_NOT_OPER
;
797 cio_disable_subchannel(sch
);
798 if (sch
->schib
.scsw
.actl
!= 0) {
799 // FIXME: not-oper indication to device driver ?
800 ccw_device_call_handler(cdev
);
802 if (get_device(&cdev
->dev
)) {
803 PREPARE_WORK(&cdev
->private->kick_work
,
804 ccw_device_call_sch_unregister
);
805 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
807 wake_up(&cdev
->private->wait_q
);
811 * Handle path verification event.
814 ccw_device_online_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
816 struct subchannel
*sch
;
818 if (cdev
->private->state
== DEV_STATE_W4SENSE
) {
819 cdev
->private->flags
.doverify
= 1;
822 sch
= to_subchannel(cdev
->dev
.parent
);
824 * Since we might not just be coming from an interrupt from the
825 * subchannel we have to update the schib.
827 stsch(sch
->schid
, &sch
->schib
);
829 if (sch
->schib
.scsw
.actl
!= 0 ||
830 (sch
->schib
.scsw
.stctl
& SCSW_STCTL_STATUS_PEND
) ||
831 (cdev
->private->irb
.scsw
.stctl
& SCSW_STCTL_STATUS_PEND
)) {
833 * No final status yet or final status not yet delivered
834 * to the device driver. Can't do path verfication now,
835 * delay until final status was delivered.
837 cdev
->private->flags
.doverify
= 1;
840 /* Device is idle, we can do the path verification. */
841 cdev
->private->state
= DEV_STATE_VERIFY
;
842 cdev
->private->flags
.doverify
= 0;
843 ccw_device_verify_start(cdev
);
847 * Got an interrupt for a normal io (state online).
850 ccw_device_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
854 irb
= (struct irb
*) __LC_IRB
;
855 /* Check for unsolicited interrupt. */
856 if ((irb
->scsw
.stctl
==
857 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
))
858 && (!irb
->scsw
.cc
)) {
859 if ((irb
->scsw
.dstat
& DEV_STAT_UNIT_CHECK
) &&
860 !irb
->esw
.esw0
.erw
.cons
) {
861 /* Unit check but no sense data. Need basic sense. */
862 if (ccw_device_do_sense(cdev
, irb
) != 0)
863 goto call_handler_unsol
;
864 memcpy(&cdev
->private->irb
, irb
, sizeof(struct irb
));
865 cdev
->private->state
= DEV_STATE_W4SENSE
;
866 cdev
->private->intparm
= 0;
871 cdev
->handler (cdev
, 0, irb
);
872 if (cdev
->private->flags
.doverify
)
873 ccw_device_online_verify(cdev
, 0);
876 /* Accumulate status and find out if a basic sense is needed. */
877 ccw_device_accumulate_irb(cdev
, irb
);
878 if (cdev
->private->flags
.dosense
) {
879 if (ccw_device_do_sense(cdev
, irb
) == 0) {
880 cdev
->private->state
= DEV_STATE_W4SENSE
;
884 /* Call the handler. */
885 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
886 /* Start delayed path verification. */
887 ccw_device_online_verify(cdev
, 0);
891 * Got an timeout in online state.
894 ccw_device_online_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
898 ccw_device_set_timeout(cdev
, 0);
899 ret
= ccw_device_cancel_halt_clear(cdev
);
901 ccw_device_set_timeout(cdev
, 3*HZ
);
902 cdev
->private->state
= DEV_STATE_TIMEOUT_KILL
;
905 if (ret
== -ENODEV
) {
906 struct subchannel
*sch
;
908 sch
= to_subchannel(cdev
->dev
.parent
);
910 PREPARE_WORK(&cdev
->private->kick_work
,
911 ccw_device_nopath_notify
);
912 queue_work(ccw_device_notify_work
,
913 &cdev
->private->kick_work
);
915 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
916 } else if (cdev
->handler
)
917 cdev
->handler(cdev
, cdev
->private->intparm
,
918 ERR_PTR(-ETIMEDOUT
));
922 * Got an interrupt for a basic sense.
925 ccw_device_w4sense(struct ccw_device
*cdev
, enum dev_event dev_event
)
929 irb
= (struct irb
*) __LC_IRB
;
930 /* Check for unsolicited interrupt. */
931 if (irb
->scsw
.stctl
==
932 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
)) {
933 if (irb
->scsw
.cc
== 1)
934 /* Basic sense hasn't started. Try again. */
935 ccw_device_do_sense(cdev
, irb
);
937 printk(KERN_INFO
"Huh? %s(%s): unsolicited "
939 __FUNCTION__
, cdev
->dev
.bus_id
);
941 cdev
->handler (cdev
, 0, irb
);
946 * Check if a halt or clear has been issued in the meanwhile. If yes,
947 * only deliver the halt/clear interrupt to the device driver as if it
948 * had killed the original request.
950 if (irb
->scsw
.fctl
& (SCSW_FCTL_CLEAR_FUNC
| SCSW_FCTL_HALT_FUNC
)) {
951 /* Retry Basic Sense if requested. */
952 if (cdev
->private->flags
.intretry
) {
953 cdev
->private->flags
.intretry
= 0;
954 ccw_device_do_sense(cdev
, irb
);
957 cdev
->private->flags
.dosense
= 0;
958 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
959 ccw_device_accumulate_irb(cdev
, irb
);
962 /* Add basic sense info to irb. */
963 ccw_device_accumulate_basic_sense(cdev
, irb
);
964 if (cdev
->private->flags
.dosense
) {
965 /* Another basic sense is needed. */
966 ccw_device_do_sense(cdev
, irb
);
970 cdev
->private->state
= DEV_STATE_ONLINE
;
971 /* Call the handler. */
972 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
973 /* Start delayed path verification. */
974 ccw_device_online_verify(cdev
, 0);
978 ccw_device_clear_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
982 irb
= (struct irb
*) __LC_IRB
;
983 /* Accumulate status. We don't do basic sense. */
984 ccw_device_accumulate_irb(cdev
, irb
);
985 /* Remember to clear irb to avoid residuals. */
986 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
987 /* Try to start delayed device verification. */
988 ccw_device_online_verify(cdev
, 0);
989 /* Note: Don't call handler for cio initiated clear! */
993 ccw_device_killing_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
995 struct subchannel
*sch
;
997 sch
= to_subchannel(cdev
->dev
.parent
);
998 ccw_device_set_timeout(cdev
, 0);
999 /* Start delayed path verification. */
1000 ccw_device_online_verify(cdev
, 0);
1001 /* OK, i/o is dead now. Call interrupt handler. */
1003 cdev
->handler(cdev
, cdev
->private->intparm
,
1008 ccw_device_killing_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
1012 ret
= ccw_device_cancel_halt_clear(cdev
);
1013 if (ret
== -EBUSY
) {
1014 ccw_device_set_timeout(cdev
, 3*HZ
);
1017 /* Start delayed path verification. */
1018 ccw_device_online_verify(cdev
, 0);
1020 cdev
->handler(cdev
, cdev
->private->intparm
,
1024 void device_kill_io(struct subchannel
*sch
)
1027 struct ccw_device
*cdev
;
1029 cdev
= sch
->dev
.driver_data
;
1030 ret
= ccw_device_cancel_halt_clear(cdev
);
1031 if (ret
== -EBUSY
) {
1032 ccw_device_set_timeout(cdev
, 3*HZ
);
1033 cdev
->private->state
= DEV_STATE_TIMEOUT_KILL
;
1036 /* Start delayed path verification. */
1037 ccw_device_online_verify(cdev
, 0);
1039 cdev
->handler(cdev
, cdev
->private->intparm
,
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
))
1107 if (!sch
->schib
.pmcw
.dnv
)
1110 * The pim, pam, pom values may not be accurate, but they are the best
1111 * we have before performing device selection :/
1113 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
1114 /* Re-set some bits in the pmcw that were lost. */
1115 sch
->schib
.pmcw
.isc
= 3;
1116 sch
->schib
.pmcw
.csense
= 1;
1117 sch
->schib
.pmcw
.ena
= 0;
1118 if ((sch
->lpm
& (sch
->lpm
- 1)) != 0)
1119 sch
->schib
.pmcw
.mp
= 1;
1120 sch
->schib
.pmcw
.intparm
= (__u32
)(unsigned long)sch
;
1121 /* We should also udate ssd info, but this has to wait. */
1122 /* Check if this is another device which appeared on the same sch. */
1123 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
) {
1124 PREPARE_WORK(&cdev
->private->kick_work
,
1125 ccw_device_move_to_orphanage
);
1126 queue_work(ccw_device_work
, &cdev
->private->kick_work
);
1128 ccw_device_start_id(cdev
, 0);
1132 ccw_device_offline_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
1134 struct subchannel
*sch
;
1136 sch
= to_subchannel(cdev
->dev
.parent
);
1138 * An interrupt in state offline means a previous disable was not
1139 * successful. Try again.
1141 cio_disable_subchannel(sch
);
1145 ccw_device_change_cmfstate(struct ccw_device
*cdev
, enum dev_event dev_event
)
1147 retry_set_schib(cdev
);
1148 cdev
->private->state
= DEV_STATE_ONLINE
;
1149 dev_fsm_event(cdev
, dev_event
);
1152 static void ccw_device_update_cmfblock(struct ccw_device
*cdev
,
1153 enum dev_event dev_event
)
1155 cmf_retry_copy_block(cdev
);
1156 cdev
->private->state
= DEV_STATE_ONLINE
;
1157 dev_fsm_event(cdev
, dev_event
);
1161 ccw_device_quiesce_done(struct ccw_device
*cdev
, enum dev_event dev_event
)
1163 ccw_device_set_timeout(cdev
, 0);
1164 if (dev_event
== DEV_EVENT_NOTOPER
)
1165 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1167 cdev
->private->state
= DEV_STATE_OFFLINE
;
1168 wake_up(&cdev
->private->wait_q
);
1172 ccw_device_quiesce_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
1176 ret
= ccw_device_cancel_halt_clear(cdev
);
1179 cdev
->private->state
= DEV_STATE_OFFLINE
;
1180 wake_up(&cdev
->private->wait_q
);
1183 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1184 wake_up(&cdev
->private->wait_q
);
1187 ccw_device_set_timeout(cdev
, HZ
/10);
1192 * No operation action. This is used e.g. to ignore a timeout event in
1196 ccw_device_nop(struct ccw_device
*cdev
, enum dev_event dev_event
)
1201 * Bug operation action.
1204 ccw_device_bug(struct ccw_device
*cdev
, enum dev_event dev_event
)
1206 printk(KERN_EMERG
"dev_jumptable[%i][%i] == NULL\n",
1207 cdev
->private->state
, dev_event
);
1212 * device statemachine
1214 fsm_func_t
*dev_jumptable
[NR_DEV_STATES
][NR_DEV_EVENTS
] = {
1215 [DEV_STATE_NOT_OPER
] = {
1216 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1217 [DEV_EVENT_INTERRUPT
] = ccw_device_bug
,
1218 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1219 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1221 [DEV_STATE_SENSE_PGID
] = {
1222 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1223 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_pgid_irq
,
1224 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1225 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1227 [DEV_STATE_SENSE_ID
] = {
1228 [DEV_EVENT_NOTOPER
] = ccw_device_recog_notoper
,
1229 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_id_irq
,
1230 [DEV_EVENT_TIMEOUT
] = ccw_device_recog_timeout
,
1231 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1233 [DEV_STATE_OFFLINE
] = {
1234 [DEV_EVENT_NOTOPER
] = ccw_device_offline_notoper
,
1235 [DEV_EVENT_INTERRUPT
] = ccw_device_offline_irq
,
1236 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1237 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1239 [DEV_STATE_VERIFY
] = {
1240 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1241 [DEV_EVENT_INTERRUPT
] = ccw_device_verify_irq
,
1242 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1243 [DEV_EVENT_VERIFY
] = ccw_device_delay_verify
,
1245 [DEV_STATE_ONLINE
] = {
1246 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1247 [DEV_EVENT_INTERRUPT
] = ccw_device_irq
,
1248 [DEV_EVENT_TIMEOUT
] = ccw_device_online_timeout
,
1249 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1251 [DEV_STATE_W4SENSE
] = {
1252 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1253 [DEV_EVENT_INTERRUPT
] = ccw_device_w4sense
,
1254 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1255 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1257 [DEV_STATE_DISBAND_PGID
] = {
1258 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1259 [DEV_EVENT_INTERRUPT
] = ccw_device_disband_irq
,
1260 [DEV_EVENT_TIMEOUT
] = ccw_device_onoff_timeout
,
1261 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1263 [DEV_STATE_BOXED
] = {
1264 [DEV_EVENT_NOTOPER
] = ccw_device_offline_notoper
,
1265 [DEV_EVENT_INTERRUPT
] = ccw_device_stlck_done
,
1266 [DEV_EVENT_TIMEOUT
] = ccw_device_stlck_done
,
1267 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1269 /* states to wait for i/o completion before doing something */
1270 [DEV_STATE_CLEAR_VERIFY
] = {
1271 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1272 [DEV_EVENT_INTERRUPT
] = ccw_device_clear_verify
,
1273 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1274 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1276 [DEV_STATE_TIMEOUT_KILL
] = {
1277 [DEV_EVENT_NOTOPER
] = ccw_device_online_notoper
,
1278 [DEV_EVENT_INTERRUPT
] = ccw_device_killing_irq
,
1279 [DEV_EVENT_TIMEOUT
] = ccw_device_killing_timeout
,
1280 [DEV_EVENT_VERIFY
] = ccw_device_nop
, //FIXME
1282 [DEV_STATE_QUIESCE
] = {
1283 [DEV_EVENT_NOTOPER
] = ccw_device_quiesce_done
,
1284 [DEV_EVENT_INTERRUPT
] = ccw_device_quiesce_done
,
1285 [DEV_EVENT_TIMEOUT
] = ccw_device_quiesce_timeout
,
1286 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1288 /* special states for devices gone not operational */
1289 [DEV_STATE_DISCONNECTED
] = {
1290 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1291 [DEV_EVENT_INTERRUPT
] = ccw_device_start_id
,
1292 [DEV_EVENT_TIMEOUT
] = ccw_device_bug
,
1293 [DEV_EVENT_VERIFY
] = ccw_device_start_id
,
1295 [DEV_STATE_DISCONNECTED_SENSE_ID
] = {
1296 [DEV_EVENT_NOTOPER
] = ccw_device_recog_notoper
,
1297 [DEV_EVENT_INTERRUPT
] = ccw_device_sense_id_irq
,
1298 [DEV_EVENT_TIMEOUT
] = ccw_device_recog_timeout
,
1299 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1301 [DEV_STATE_CMFCHANGE
] = {
1302 [DEV_EVENT_NOTOPER
] = ccw_device_change_cmfstate
,
1303 [DEV_EVENT_INTERRUPT
] = ccw_device_change_cmfstate
,
1304 [DEV_EVENT_TIMEOUT
] = ccw_device_change_cmfstate
,
1305 [DEV_EVENT_VERIFY
] = ccw_device_change_cmfstate
,
1307 [DEV_STATE_CMFUPDATE
] = {
1308 [DEV_EVENT_NOTOPER
] = ccw_device_update_cmfblock
,
1309 [DEV_EVENT_INTERRUPT
] = ccw_device_update_cmfblock
,
1310 [DEV_EVENT_TIMEOUT
] = ccw_device_update_cmfblock
,
1311 [DEV_EVENT_VERIFY
] = ccw_device_update_cmfblock
,
1316 * io_subchannel_irq is called for "real" interrupts or for status
1317 * pending conditions on msch.
1320 io_subchannel_irq (struct device
*pdev
)
1322 struct ccw_device
*cdev
;
1324 cdev
= to_subchannel(pdev
)->dev
.driver_data
;
1326 CIO_TRACE_EVENT (3, "IRQ");
1327 CIO_TRACE_EVENT (3, pdev
->bus_id
);
1329 dev_fsm_event(cdev
, DEV_EVENT_INTERRUPT
);
1332 EXPORT_SYMBOL_GPL(ccw_device_set_timeout
);