1 // SPDX-License-Identifier: GPL-2.0
3 * finite state machine for device handling
5 * Copyright IBM Corp. 2002, 2008
6 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/jiffies.h>
13 #include <linux/string.h>
15 #include <asm/ccwdev.h>
17 #include <asm/chpid.h>
20 #include "cio_debug.h"
27 static int timeout_log_enabled
;
29 static int __init
ccw_timeout_log_setup(char *unused
)
31 timeout_log_enabled
= 1;
35 __setup("ccw_timeout_log", ccw_timeout_log_setup
);
37 static void ccw_timeout_log(struct ccw_device
*cdev
)
40 struct subchannel
*sch
;
41 struct io_subchannel_private
*private;
45 sch
= to_subchannel(cdev
->dev
.parent
);
46 private = to_io_private(sch
);
48 cc
= stsch(sch
->schid
, &schib
);
50 printk(KERN_WARNING
"cio: ccw device timeout occurred at %llx, "
51 "device information:\n", get_tod_clock());
52 printk(KERN_WARNING
"cio: orb:\n");
53 print_hex_dump(KERN_WARNING
, "cio: ", DUMP_PREFIX_NONE
, 16, 1,
54 orb
, sizeof(*orb
), 0);
55 printk(KERN_WARNING
"cio: ccw device bus id: %s\n",
56 dev_name(&cdev
->dev
));
57 printk(KERN_WARNING
"cio: subchannel bus id: %s\n",
59 printk(KERN_WARNING
"cio: subchannel lpm: %02x, opm: %02x, "
60 "vpm: %02x\n", sch
->lpm
, sch
->opm
, sch
->vpm
);
63 printk(KERN_WARNING
"cio: orb indicates transport mode\n");
64 printk(KERN_WARNING
"cio: last tcw:\n");
65 print_hex_dump(KERN_WARNING
, "cio: ", DUMP_PREFIX_NONE
, 16, 1,
66 (void *)(addr_t
)orb
->tm
.tcw
,
67 sizeof(struct tcw
), 0);
69 printk(KERN_WARNING
"cio: orb indicates command mode\n");
70 if ((void *)(addr_t
)orb
->cmd
.cpa
== &private->sense_ccw
||
71 (void *)(addr_t
)orb
->cmd
.cpa
== cdev
->private->iccws
)
72 printk(KERN_WARNING
"cio: last channel program "
75 printk(KERN_WARNING
"cio: last channel program:\n");
77 print_hex_dump(KERN_WARNING
, "cio: ", DUMP_PREFIX_NONE
, 16, 1,
78 (void *)(addr_t
)orb
->cmd
.cpa
,
79 sizeof(struct ccw1
), 0);
81 printk(KERN_WARNING
"cio: ccw device state: %d\n",
82 cdev
->private->state
);
83 printk(KERN_WARNING
"cio: store subchannel returned: cc=%d\n", cc
);
84 printk(KERN_WARNING
"cio: schib:\n");
85 print_hex_dump(KERN_WARNING
, "cio: ", DUMP_PREFIX_NONE
, 16, 1,
86 &schib
, sizeof(schib
), 0);
87 printk(KERN_WARNING
"cio: ccw device flags:\n");
88 print_hex_dump(KERN_WARNING
, "cio: ", DUMP_PREFIX_NONE
, 16, 1,
89 &cdev
->private->flags
, sizeof(cdev
->private->flags
), 0);
93 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
96 ccw_device_timeout(struct timer_list
*t
)
98 struct ccw_device_private
*priv
= from_timer(priv
, t
, timer
);
99 struct ccw_device
*cdev
= priv
->cdev
;
101 spin_lock_irq(cdev
->ccwlock
);
102 if (timeout_log_enabled
)
103 ccw_timeout_log(cdev
);
104 dev_fsm_event(cdev
, DEV_EVENT_TIMEOUT
);
105 spin_unlock_irq(cdev
->ccwlock
);
112 ccw_device_set_timeout(struct ccw_device
*cdev
, int expires
)
115 del_timer(&cdev
->private->timer
);
118 if (timer_pending(&cdev
->private->timer
)) {
119 if (mod_timer(&cdev
->private->timer
, jiffies
+ expires
))
122 cdev
->private->timer
.expires
= jiffies
+ expires
;
123 add_timer(&cdev
->private->timer
);
127 ccw_device_cancel_halt_clear(struct ccw_device
*cdev
)
129 struct subchannel
*sch
;
132 sch
= to_subchannel(cdev
->dev
.parent
);
133 ret
= cio_cancel_halt_clear(sch
, &cdev
->private->iretry
);
136 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n",
137 cdev
->private->dev_id
.ssid
,
138 cdev
->private->dev_id
.devno
);
143 void ccw_device_update_sense_data(struct ccw_device
*cdev
)
145 memset(&cdev
->id
, 0, sizeof(cdev
->id
));
146 cdev
->id
.cu_type
= cdev
->private->senseid
.cu_type
;
147 cdev
->id
.cu_model
= cdev
->private->senseid
.cu_model
;
148 cdev
->id
.dev_type
= cdev
->private->senseid
.dev_type
;
149 cdev
->id
.dev_model
= cdev
->private->senseid
.dev_model
;
152 int ccw_device_test_sense_data(struct ccw_device
*cdev
)
154 return cdev
->id
.cu_type
== cdev
->private->senseid
.cu_type
&&
155 cdev
->id
.cu_model
== cdev
->private->senseid
.cu_model
&&
156 cdev
->id
.dev_type
== cdev
->private->senseid
.dev_type
&&
157 cdev
->id
.dev_model
== cdev
->private->senseid
.dev_model
;
161 * The machine won't give us any notification by machine check if a chpid has
162 * been varied online on the SE so we have to find out by magic (i. e. driving
163 * the channel subsystem to device selection and updating our path masks).
166 __recover_lost_chpids(struct subchannel
*sch
, int old_lpm
)
172 for (i
= 0; i
<8; i
++) {
174 if (!(sch
->lpm
& mask
))
178 chpid
.id
= sch
->schib
.pmcw
.chpid
[i
];
179 if (!chp_is_registered(chpid
))
180 css_schedule_eval_all();
185 * Stop device recognition.
188 ccw_device_recog_done(struct ccw_device
*cdev
, int state
)
190 struct subchannel
*sch
;
193 sch
= to_subchannel(cdev
->dev
.parent
);
195 if (cio_disable_subchannel(sch
))
196 state
= DEV_STATE_NOT_OPER
;
198 * Now that we tried recognition, we have performed device selection
199 * through ssch() and the path information is up to date.
203 /* Check since device may again have become not operational. */
204 if (cio_update_schib(sch
))
205 state
= DEV_STATE_NOT_OPER
;
207 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
209 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
)
210 /* Force reprobe on all chpids. */
212 if (sch
->lpm
!= old_lpm
)
213 __recover_lost_chpids(sch
, old_lpm
);
214 if (cdev
->private->state
== DEV_STATE_DISCONNECTED_SENSE_ID
&&
215 (state
== DEV_STATE_NOT_OPER
|| state
== DEV_STATE_BOXED
)) {
216 cdev
->private->flags
.recog_done
= 1;
217 cdev
->private->state
= DEV_STATE_DISCONNECTED
;
218 wake_up(&cdev
->private->wait_q
);
221 if (cdev
->private->flags
.resuming
) {
222 cdev
->private->state
= state
;
223 cdev
->private->flags
.recog_done
= 1;
224 wake_up(&cdev
->private->wait_q
);
228 case DEV_STATE_NOT_OPER
:
230 case DEV_STATE_OFFLINE
:
232 ccw_device_update_sense_data(cdev
);
235 cdev
->private->state
= DEV_STATE_OFFLINE
;
236 cdev
->private->flags
.recog_done
= 1;
237 if (ccw_device_test_sense_data(cdev
)) {
238 cdev
->private->flags
.donotify
= 1;
239 ccw_device_online(cdev
);
240 wake_up(&cdev
->private->wait_q
);
242 ccw_device_update_sense_data(cdev
);
243 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
246 case DEV_STATE_BOXED
:
247 if (cdev
->id
.cu_type
!= 0) { /* device was recognized before */
248 cdev
->private->flags
.recog_done
= 1;
249 cdev
->private->state
= DEV_STATE_BOXED
;
250 wake_up(&cdev
->private->wait_q
);
255 cdev
->private->state
= state
;
256 io_subchannel_recog_done(cdev
);
257 wake_up(&cdev
->private->wait_q
);
261 * Function called from device_id.c after sense id has completed.
264 ccw_device_sense_id_done(struct ccw_device
*cdev
, int err
)
268 ccw_device_recog_done(cdev
, DEV_STATE_OFFLINE
);
270 case -ETIME
: /* Sense id stopped by timeout. */
271 ccw_device_recog_done(cdev
, DEV_STATE_BOXED
);
274 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
280 * ccw_device_notify() - inform the device's driver about an event
281 * @cdev: device for which an event occurred
282 * @event: event that occurred
285 * -%EINVAL if the device is offline or has no driver.
286 * -%EOPNOTSUPP if the device's driver has no notifier registered.
287 * %NOTIFY_OK if the driver wants to keep the device.
288 * %NOTIFY_BAD if the driver doesn't want to keep the device.
290 int ccw_device_notify(struct ccw_device
*cdev
, int event
)
298 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
299 cdev
->private->dev_id
.ssid
, cdev
->private->dev_id
.devno
,
301 if (!cdev
->drv
->notify
) {
305 if (cdev
->drv
->notify(cdev
, event
))
313 static void ccw_device_oper_notify(struct ccw_device
*cdev
)
315 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
317 if (ccw_device_notify(cdev
, CIO_OPER
) == NOTIFY_OK
) {
318 /* Reenable channel measurements, if needed. */
319 ccw_device_sched_todo(cdev
, CDEV_TODO_ENABLE_CMF
);
320 /* Save indication for new paths. */
321 cdev
->private->path_new_mask
= sch
->vpm
;
324 /* Driver doesn't want device back. */
325 ccw_device_set_notoper(cdev
);
326 ccw_device_sched_todo(cdev
, CDEV_TODO_REBIND
);
330 * Finished with online/offline processing.
333 ccw_device_done(struct ccw_device
*cdev
, int state
)
335 struct subchannel
*sch
;
337 sch
= to_subchannel(cdev
->dev
.parent
);
339 ccw_device_set_timeout(cdev
, 0);
341 if (state
!= DEV_STATE_ONLINE
)
342 cio_disable_subchannel(sch
);
344 /* Reset device status. */
345 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
347 cdev
->private->state
= state
;
350 case DEV_STATE_BOXED
:
351 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
352 cdev
->private->dev_id
.devno
, sch
->schid
.sch_no
);
354 ccw_device_notify(cdev
, CIO_BOXED
) != NOTIFY_OK
)
355 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
356 cdev
->private->flags
.donotify
= 0;
358 case DEV_STATE_NOT_OPER
:
359 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
360 cdev
->private->dev_id
.devno
, sch
->schid
.sch_no
);
361 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
362 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
364 ccw_device_set_disconnected(cdev
);
365 cdev
->private->flags
.donotify
= 0;
367 case DEV_STATE_DISCONNECTED
:
368 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
369 "%04x\n", cdev
->private->dev_id
.devno
,
371 if (ccw_device_notify(cdev
, CIO_NO_PATH
) != NOTIFY_OK
) {
372 cdev
->private->state
= DEV_STATE_NOT_OPER
;
373 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
375 ccw_device_set_disconnected(cdev
);
376 cdev
->private->flags
.donotify
= 0;
382 if (cdev
->private->flags
.donotify
) {
383 cdev
->private->flags
.donotify
= 0;
384 ccw_device_oper_notify(cdev
);
386 wake_up(&cdev
->private->wait_q
);
390 * Start device recognition.
392 void ccw_device_recognition(struct ccw_device
*cdev
)
394 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
397 * We used to start here with a sense pgid to find out whether a device
398 * is locked by someone else. Unfortunately, the sense pgid command
399 * code has other meanings on devices predating the path grouping
400 * algorithm, so we start with sense id and box the device after an
401 * timeout (or if sense pgid during path verification detects the device
402 * is locked, as may happen on newer devices).
404 cdev
->private->flags
.recog_done
= 0;
405 cdev
->private->state
= DEV_STATE_SENSE_ID
;
406 if (cio_enable_subchannel(sch
, (u32
) (addr_t
) sch
)) {
407 ccw_device_recog_done(cdev
, DEV_STATE_NOT_OPER
);
410 ccw_device_sense_id_start(cdev
);
414 * Handle events for states that use the ccw request infrastructure.
416 static void ccw_device_request_event(struct ccw_device
*cdev
, enum dev_event e
)
419 case DEV_EVENT_NOTOPER
:
420 ccw_request_notoper(cdev
);
422 case DEV_EVENT_INTERRUPT
:
423 ccw_request_handler(cdev
);
425 case DEV_EVENT_TIMEOUT
:
426 ccw_request_timeout(cdev
);
433 static void ccw_device_report_path_events(struct ccw_device
*cdev
)
435 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
439 for (chp
= 0, mask
= 0x80; chp
< 8; chp
++, mask
>>= 1) {
440 path_event
[chp
] = PE_NONE
;
441 if (mask
& cdev
->private->path_gone_mask
& ~(sch
->vpm
))
442 path_event
[chp
] |= PE_PATH_GONE
;
443 if (mask
& cdev
->private->path_new_mask
& sch
->vpm
)
444 path_event
[chp
] |= PE_PATH_AVAILABLE
;
445 if (mask
& cdev
->private->pgid_reset_mask
& sch
->vpm
)
446 path_event
[chp
] |= PE_PATHGROUP_ESTABLISHED
;
448 if (cdev
->online
&& cdev
->drv
->path_event
)
449 cdev
->drv
->path_event(cdev
, path_event
);
452 static void ccw_device_reset_path_events(struct ccw_device
*cdev
)
454 cdev
->private->path_gone_mask
= 0;
455 cdev
->private->path_new_mask
= 0;
456 cdev
->private->pgid_reset_mask
= 0;
459 static void create_fake_irb(struct irb
*irb
, int type
)
461 memset(irb
, 0, sizeof(*irb
));
462 if (type
== FAKE_CMD_IRB
) {
463 struct cmd_scsw
*scsw
= &irb
->scsw
.cmd
;
465 scsw
->fctl
= SCSW_FCTL_START_FUNC
;
466 scsw
->actl
= SCSW_ACTL_START_PEND
;
467 scsw
->stctl
= SCSW_STCTL_STATUS_PEND
;
468 } else if (type
== FAKE_TM_IRB
) {
469 struct tm_scsw
*scsw
= &irb
->scsw
.tm
;
472 scsw
->fctl
= SCSW_FCTL_START_FUNC
;
473 scsw
->actl
= SCSW_ACTL_START_PEND
;
474 scsw
->stctl
= SCSW_STCTL_STATUS_PEND
;
478 static void ccw_device_handle_broken_paths(struct ccw_device
*cdev
)
480 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
481 u8 broken_paths
= (sch
->schib
.pmcw
.pam
& sch
->opm
) ^ sch
->vpm
;
483 if (broken_paths
&& (cdev
->private->path_broken_mask
!= broken_paths
))
484 ccw_device_schedule_recovery();
486 cdev
->private->path_broken_mask
= broken_paths
;
489 void ccw_device_verify_done(struct ccw_device
*cdev
, int err
)
491 struct subchannel
*sch
;
493 sch
= to_subchannel(cdev
->dev
.parent
);
494 /* Update schib - pom may have changed. */
495 if (cio_update_schib(sch
)) {
499 /* Update lpm with verified path mask. */
501 /* Repeat path verification? */
502 if (cdev
->private->flags
.doverify
) {
503 ccw_device_verify_start(cdev
);
509 ccw_device_done(cdev
, DEV_STATE_ONLINE
);
510 /* Deliver fake irb to device driver, if needed. */
511 if (cdev
->private->flags
.fake_irb
) {
512 create_fake_irb(&cdev
->private->irb
,
513 cdev
->private->flags
.fake_irb
);
514 cdev
->private->flags
.fake_irb
= 0;
516 cdev
->handler(cdev
, cdev
->private->intparm
,
517 &cdev
->private->irb
);
518 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
520 ccw_device_report_path_events(cdev
);
521 ccw_device_handle_broken_paths(cdev
);
525 /* Reset oper notify indication after verify error. */
526 cdev
->private->flags
.donotify
= 0;
527 ccw_device_done(cdev
, DEV_STATE_BOXED
);
530 /* Reset oper notify indication after verify error. */
531 cdev
->private->flags
.donotify
= 0;
532 ccw_device_done(cdev
, DEV_STATE_DISCONNECTED
);
535 /* Reset oper notify indication after verify error. */
536 cdev
->private->flags
.donotify
= 0;
537 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
540 ccw_device_reset_path_events(cdev
);
547 ccw_device_online(struct ccw_device
*cdev
)
549 struct subchannel
*sch
;
552 if ((cdev
->private->state
!= DEV_STATE_OFFLINE
) &&
553 (cdev
->private->state
!= DEV_STATE_BOXED
))
555 sch
= to_subchannel(cdev
->dev
.parent
);
556 ret
= cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
);
558 /* Couldn't enable the subchannel for i/o. Sick device. */
560 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
563 /* Start initial path verification. */
564 cdev
->private->state
= DEV_STATE_VERIFY
;
565 ccw_device_verify_start(cdev
);
570 ccw_device_disband_done(struct ccw_device
*cdev
, int err
)
574 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
577 ccw_device_done(cdev
, DEV_STATE_BOXED
);
580 cdev
->private->flags
.donotify
= 0;
581 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
590 ccw_device_offline(struct ccw_device
*cdev
)
592 struct subchannel
*sch
;
594 /* Allow ccw_device_offline while disconnected. */
595 if (cdev
->private->state
== DEV_STATE_DISCONNECTED
||
596 cdev
->private->state
== DEV_STATE_NOT_OPER
) {
597 cdev
->private->flags
.donotify
= 0;
598 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
601 if (cdev
->private->state
== DEV_STATE_BOXED
) {
602 ccw_device_done(cdev
, DEV_STATE_BOXED
);
605 if (ccw_device_is_orphan(cdev
)) {
606 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
609 sch
= to_subchannel(cdev
->dev
.parent
);
610 if (cio_update_schib(sch
))
612 if (scsw_actl(&sch
->schib
.scsw
) != 0)
614 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
616 /* Are we doing path grouping? */
617 if (!cdev
->private->flags
.pgroup
) {
618 /* No, set state offline immediately. */
619 ccw_device_done(cdev
, DEV_STATE_OFFLINE
);
622 /* Start Set Path Group commands. */
623 cdev
->private->state
= DEV_STATE_DISBAND_PGID
;
624 ccw_device_disband_start(cdev
);
629 * Handle not operational event in non-special state.
631 static void ccw_device_generic_notoper(struct ccw_device
*cdev
,
632 enum dev_event dev_event
)
634 if (ccw_device_notify(cdev
, CIO_GONE
) != NOTIFY_OK
)
635 ccw_device_sched_todo(cdev
, CDEV_TODO_UNREG
);
637 ccw_device_set_disconnected(cdev
);
641 * Handle path verification event in offline state.
643 static void ccw_device_offline_verify(struct ccw_device
*cdev
,
644 enum dev_event dev_event
)
646 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
648 css_schedule_eval(sch
->schid
);
652 * Handle path verification event.
655 ccw_device_online_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
657 struct subchannel
*sch
;
659 if (cdev
->private->state
== DEV_STATE_W4SENSE
) {
660 cdev
->private->flags
.doverify
= 1;
663 sch
= to_subchannel(cdev
->dev
.parent
);
665 * Since we might not just be coming from an interrupt from the
666 * subchannel we have to update the schib.
668 if (cio_update_schib(sch
)) {
669 ccw_device_verify_done(cdev
, -ENODEV
);
673 if (scsw_actl(&sch
->schib
.scsw
) != 0 ||
674 (scsw_stctl(&sch
->schib
.scsw
) & SCSW_STCTL_STATUS_PEND
) ||
675 (scsw_stctl(&cdev
->private->irb
.scsw
) & SCSW_STCTL_STATUS_PEND
)) {
677 * No final status yet or final status not yet delivered
678 * to the device driver. Can't do path verification now,
679 * delay until final status was delivered.
681 cdev
->private->flags
.doverify
= 1;
684 /* Device is idle, we can do the path verification. */
685 cdev
->private->state
= DEV_STATE_VERIFY
;
686 ccw_device_verify_start(cdev
);
690 * Handle path verification event in boxed state.
692 static void ccw_device_boxed_verify(struct ccw_device
*cdev
,
693 enum dev_event dev_event
)
695 struct subchannel
*sch
= to_subchannel(cdev
->dev
.parent
);
698 if (cio_enable_subchannel(sch
, (u32
) (addr_t
) sch
))
699 ccw_device_done(cdev
, DEV_STATE_NOT_OPER
);
701 ccw_device_online_verify(cdev
, dev_event
);
703 css_schedule_eval(sch
->schid
);
707 * Pass interrupt to device driver.
709 static int ccw_device_call_handler(struct ccw_device
*cdev
)
715 * we allow for the device action handler if .
716 * - we received ending status
717 * - the action handler requested to see all interrupts
718 * - we received an intermediate status
719 * - fast notification was requested (primary status)
720 * - unsolicited interrupts
722 stctl
= scsw_stctl(&cdev
->private->irb
.scsw
);
723 ending_status
= (stctl
& SCSW_STCTL_SEC_STATUS
) ||
724 (stctl
== (SCSW_STCTL_ALERT_STATUS
| SCSW_STCTL_STATUS_PEND
)) ||
725 (stctl
== SCSW_STCTL_STATUS_PEND
);
726 if (!ending_status
&&
727 !cdev
->private->options
.repall
&&
728 !(stctl
& SCSW_STCTL_INTER_STATUS
) &&
729 !(cdev
->private->options
.fast
&&
730 (stctl
& SCSW_STCTL_PRIM_STATUS
)))
734 ccw_device_set_timeout(cdev
, 0);
737 cdev
->handler(cdev
, cdev
->private->intparm
,
738 &cdev
->private->irb
);
740 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
745 * Got an interrupt for a normal io (state online).
748 ccw_device_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
753 irb
= this_cpu_ptr(&cio_irb
);
754 is_cmd
= !scsw_is_tm(&irb
->scsw
);
755 /* Check for unsolicited interrupt. */
756 if (!scsw_is_solicited(&irb
->scsw
)) {
757 if (is_cmd
&& (irb
->scsw
.cmd
.dstat
& DEV_STAT_UNIT_CHECK
) &&
758 !irb
->esw
.esw0
.erw
.cons
) {
759 /* Unit check but no sense data. Need basic sense. */
760 if (ccw_device_do_sense(cdev
, irb
) != 0)
761 goto call_handler_unsol
;
762 memcpy(&cdev
->private->irb
, irb
, sizeof(struct irb
));
763 cdev
->private->state
= DEV_STATE_W4SENSE
;
764 cdev
->private->intparm
= 0;
769 cdev
->handler (cdev
, 0, irb
);
770 if (cdev
->private->flags
.doverify
)
771 ccw_device_online_verify(cdev
, 0);
774 /* Accumulate status and find out if a basic sense is needed. */
775 ccw_device_accumulate_irb(cdev
, irb
);
776 if (is_cmd
&& cdev
->private->flags
.dosense
) {
777 if (ccw_device_do_sense(cdev
, irb
) == 0) {
778 cdev
->private->state
= DEV_STATE_W4SENSE
;
782 /* Call the handler. */
783 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
784 /* Start delayed path verification. */
785 ccw_device_online_verify(cdev
, 0);
789 * Got an timeout in online state.
792 ccw_device_online_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
796 ccw_device_set_timeout(cdev
, 0);
797 cdev
->private->iretry
= 255;
798 ret
= ccw_device_cancel_halt_clear(cdev
);
800 ccw_device_set_timeout(cdev
, 3*HZ
);
801 cdev
->private->state
= DEV_STATE_TIMEOUT_KILL
;
805 dev_fsm_event(cdev
, DEV_EVENT_NOTOPER
);
806 else if (cdev
->handler
)
807 cdev
->handler(cdev
, cdev
->private->intparm
,
808 ERR_PTR(-ETIMEDOUT
));
812 * Got an interrupt for a basic sense.
815 ccw_device_w4sense(struct ccw_device
*cdev
, enum dev_event dev_event
)
819 irb
= this_cpu_ptr(&cio_irb
);
820 /* Check for unsolicited interrupt. */
821 if (scsw_stctl(&irb
->scsw
) ==
822 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
)) {
823 if (scsw_cc(&irb
->scsw
) == 1)
824 /* Basic sense hasn't started. Try again. */
825 ccw_device_do_sense(cdev
, irb
);
827 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
828 "interrupt during w4sense...\n",
829 cdev
->private->dev_id
.ssid
,
830 cdev
->private->dev_id
.devno
);
832 cdev
->handler (cdev
, 0, irb
);
837 * Check if a halt or clear has been issued in the meanwhile. If yes,
838 * only deliver the halt/clear interrupt to the device driver as if it
839 * had killed the original request.
841 if (scsw_fctl(&irb
->scsw
) &
842 (SCSW_FCTL_CLEAR_FUNC
| SCSW_FCTL_HALT_FUNC
)) {
843 cdev
->private->flags
.dosense
= 0;
844 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
845 ccw_device_accumulate_irb(cdev
, irb
);
848 /* Add basic sense info to irb. */
849 ccw_device_accumulate_basic_sense(cdev
, irb
);
850 if (cdev
->private->flags
.dosense
) {
851 /* Another basic sense is needed. */
852 ccw_device_do_sense(cdev
, irb
);
856 cdev
->private->state
= DEV_STATE_ONLINE
;
857 /* In case sensing interfered with setting the device online */
858 wake_up(&cdev
->private->wait_q
);
859 /* Call the handler. */
860 if (ccw_device_call_handler(cdev
) && cdev
->private->flags
.doverify
)
861 /* Start delayed path verification. */
862 ccw_device_online_verify(cdev
, 0);
866 ccw_device_killing_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
868 ccw_device_set_timeout(cdev
, 0);
869 /* Start delayed path verification. */
870 ccw_device_online_verify(cdev
, 0);
871 /* OK, i/o is dead now. Call interrupt handler. */
873 cdev
->handler(cdev
, cdev
->private->intparm
,
878 ccw_device_killing_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
882 ret
= ccw_device_cancel_halt_clear(cdev
);
884 ccw_device_set_timeout(cdev
, 3*HZ
);
887 /* Start delayed path verification. */
888 ccw_device_online_verify(cdev
, 0);
890 cdev
->handler(cdev
, cdev
->private->intparm
,
894 void ccw_device_kill_io(struct ccw_device
*cdev
)
898 cdev
->private->iretry
= 255;
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 /* Start delayed path verification. */
906 ccw_device_online_verify(cdev
, 0);
908 cdev
->handler(cdev
, cdev
->private->intparm
,
913 ccw_device_delay_verify(struct ccw_device
*cdev
, enum dev_event dev_event
)
915 /* Start verification after current task finished. */
916 cdev
->private->flags
.doverify
= 1;
920 ccw_device_start_id(struct ccw_device
*cdev
, enum dev_event dev_event
)
922 struct subchannel
*sch
;
924 sch
= to_subchannel(cdev
->dev
.parent
);
925 if (cio_enable_subchannel(sch
, (u32
)(addr_t
)sch
) != 0)
926 /* Couldn't enable the subchannel for i/o. Sick device. */
928 cdev
->private->state
= DEV_STATE_DISCONNECTED_SENSE_ID
;
929 ccw_device_sense_id_start(cdev
);
932 void ccw_device_trigger_reprobe(struct ccw_device
*cdev
)
934 struct subchannel
*sch
;
936 if (cdev
->private->state
!= DEV_STATE_DISCONNECTED
)
939 sch
= to_subchannel(cdev
->dev
.parent
);
940 /* Update some values. */
941 if (cio_update_schib(sch
))
944 * The pim, pam, pom values may not be accurate, but they are the best
945 * we have before performing device selection :/
947 sch
->lpm
= sch
->schib
.pmcw
.pam
& sch
->opm
;
949 * Use the initial configuration since we can't be shure that the old
952 io_subchannel_init_config(sch
);
953 if (cio_commit_config(sch
))
956 /* We should also udate ssd info, but this has to wait. */
957 /* Check if this is another device which appeared on the same sch. */
958 if (sch
->schib
.pmcw
.dev
!= cdev
->private->dev_id
.devno
)
959 css_schedule_eval(sch
->schid
);
961 ccw_device_start_id(cdev
, 0);
964 static void ccw_device_disabled_irq(struct ccw_device
*cdev
,
965 enum dev_event dev_event
)
967 struct subchannel
*sch
;
969 sch
= to_subchannel(cdev
->dev
.parent
);
971 * An interrupt in a disabled state means a previous disable was not
972 * successful - should not happen, but we try to disable again.
974 cio_disable_subchannel(sch
);
978 ccw_device_change_cmfstate(struct ccw_device
*cdev
, enum dev_event dev_event
)
980 retry_set_schib(cdev
);
981 cdev
->private->state
= DEV_STATE_ONLINE
;
982 dev_fsm_event(cdev
, dev_event
);
985 static void ccw_device_update_cmfblock(struct ccw_device
*cdev
,
986 enum dev_event dev_event
)
988 cmf_retry_copy_block(cdev
);
989 cdev
->private->state
= DEV_STATE_ONLINE
;
990 dev_fsm_event(cdev
, dev_event
);
994 ccw_device_quiesce_done(struct ccw_device
*cdev
, enum dev_event dev_event
)
996 ccw_device_set_timeout(cdev
, 0);
997 cdev
->private->state
= DEV_STATE_NOT_OPER
;
998 wake_up(&cdev
->private->wait_q
);
1002 ccw_device_quiesce_timeout(struct ccw_device
*cdev
, enum dev_event dev_event
)
1006 ret
= ccw_device_cancel_halt_clear(cdev
);
1007 if (ret
== -EBUSY
) {
1008 ccw_device_set_timeout(cdev
, HZ
/10);
1010 cdev
->private->state
= DEV_STATE_NOT_OPER
;
1011 wake_up(&cdev
->private->wait_q
);
1016 * No operation action. This is used e.g. to ignore a timeout event in
1020 ccw_device_nop(struct ccw_device
*cdev
, enum dev_event dev_event
)
1025 * device statemachine
1027 fsm_func_t
*dev_jumptable
[NR_DEV_STATES
][NR_DEV_EVENTS
] = {
1028 [DEV_STATE_NOT_OPER
] = {
1029 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1030 [DEV_EVENT_INTERRUPT
] = ccw_device_disabled_irq
,
1031 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1032 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1034 [DEV_STATE_SENSE_ID
] = {
1035 [DEV_EVENT_NOTOPER
] = ccw_device_request_event
,
1036 [DEV_EVENT_INTERRUPT
] = ccw_device_request_event
,
1037 [DEV_EVENT_TIMEOUT
] = ccw_device_request_event
,
1038 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1040 [DEV_STATE_OFFLINE
] = {
1041 [DEV_EVENT_NOTOPER
] = ccw_device_generic_notoper
,
1042 [DEV_EVENT_INTERRUPT
] = ccw_device_disabled_irq
,
1043 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1044 [DEV_EVENT_VERIFY
] = ccw_device_offline_verify
,
1046 [DEV_STATE_VERIFY
] = {
1047 [DEV_EVENT_NOTOPER
] = ccw_device_request_event
,
1048 [DEV_EVENT_INTERRUPT
] = ccw_device_request_event
,
1049 [DEV_EVENT_TIMEOUT
] = ccw_device_request_event
,
1050 [DEV_EVENT_VERIFY
] = ccw_device_delay_verify
,
1052 [DEV_STATE_ONLINE
] = {
1053 [DEV_EVENT_NOTOPER
] = ccw_device_generic_notoper
,
1054 [DEV_EVENT_INTERRUPT
] = ccw_device_irq
,
1055 [DEV_EVENT_TIMEOUT
] = ccw_device_online_timeout
,
1056 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1058 [DEV_STATE_W4SENSE
] = {
1059 [DEV_EVENT_NOTOPER
] = ccw_device_generic_notoper
,
1060 [DEV_EVENT_INTERRUPT
] = ccw_device_w4sense
,
1061 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1062 [DEV_EVENT_VERIFY
] = ccw_device_online_verify
,
1064 [DEV_STATE_DISBAND_PGID
] = {
1065 [DEV_EVENT_NOTOPER
] = ccw_device_request_event
,
1066 [DEV_EVENT_INTERRUPT
] = ccw_device_request_event
,
1067 [DEV_EVENT_TIMEOUT
] = ccw_device_request_event
,
1068 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1070 [DEV_STATE_BOXED
] = {
1071 [DEV_EVENT_NOTOPER
] = ccw_device_generic_notoper
,
1072 [DEV_EVENT_INTERRUPT
] = ccw_device_nop
,
1073 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1074 [DEV_EVENT_VERIFY
] = ccw_device_boxed_verify
,
1076 /* states to wait for i/o completion before doing something */
1077 [DEV_STATE_TIMEOUT_KILL
] = {
1078 [DEV_EVENT_NOTOPER
] = ccw_device_generic_notoper
,
1079 [DEV_EVENT_INTERRUPT
] = ccw_device_killing_irq
,
1080 [DEV_EVENT_TIMEOUT
] = ccw_device_killing_timeout
,
1081 [DEV_EVENT_VERIFY
] = ccw_device_nop
, //FIXME
1083 [DEV_STATE_QUIESCE
] = {
1084 [DEV_EVENT_NOTOPER
] = ccw_device_quiesce_done
,
1085 [DEV_EVENT_INTERRUPT
] = ccw_device_quiesce_done
,
1086 [DEV_EVENT_TIMEOUT
] = ccw_device_quiesce_timeout
,
1087 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1089 /* special states for devices gone not operational */
1090 [DEV_STATE_DISCONNECTED
] = {
1091 [DEV_EVENT_NOTOPER
] = ccw_device_nop
,
1092 [DEV_EVENT_INTERRUPT
] = ccw_device_start_id
,
1093 [DEV_EVENT_TIMEOUT
] = ccw_device_nop
,
1094 [DEV_EVENT_VERIFY
] = ccw_device_start_id
,
1096 [DEV_STATE_DISCONNECTED_SENSE_ID
] = {
1097 [DEV_EVENT_NOTOPER
] = ccw_device_request_event
,
1098 [DEV_EVENT_INTERRUPT
] = ccw_device_request_event
,
1099 [DEV_EVENT_TIMEOUT
] = ccw_device_request_event
,
1100 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1102 [DEV_STATE_CMFCHANGE
] = {
1103 [DEV_EVENT_NOTOPER
] = ccw_device_change_cmfstate
,
1104 [DEV_EVENT_INTERRUPT
] = ccw_device_change_cmfstate
,
1105 [DEV_EVENT_TIMEOUT
] = ccw_device_change_cmfstate
,
1106 [DEV_EVENT_VERIFY
] = ccw_device_change_cmfstate
,
1108 [DEV_STATE_CMFUPDATE
] = {
1109 [DEV_EVENT_NOTOPER
] = ccw_device_update_cmfblock
,
1110 [DEV_EVENT_INTERRUPT
] = ccw_device_update_cmfblock
,
1111 [DEV_EVENT_TIMEOUT
] = ccw_device_update_cmfblock
,
1112 [DEV_EVENT_VERIFY
] = ccw_device_update_cmfblock
,
1114 [DEV_STATE_STEAL_LOCK
] = {
1115 [DEV_EVENT_NOTOPER
] = ccw_device_request_event
,
1116 [DEV_EVENT_INTERRUPT
] = ccw_device_request_event
,
1117 [DEV_EVENT_TIMEOUT
] = ccw_device_request_event
,
1118 [DEV_EVENT_VERIFY
] = ccw_device_nop
,
1122 EXPORT_SYMBOL_GPL(ccw_device_set_timeout
);