ARM: 7989/1: Delete asm/system.h
[linux/fpc-iii.git] / drivers / s390 / cio / device_fsm.c
blobc7638c5432502f394f9b7d86ae55f85e084e78c1
1 /*
2 * finite state machine for device handling
4 * Copyright IBM Corp. 2002, 2008
5 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/jiffies.h>
12 #include <linux/string.h>
14 #include <asm/ccwdev.h>
15 #include <asm/cio.h>
16 #include <asm/chpid.h>
18 #include "cio.h"
19 #include "cio_debug.h"
20 #include "css.h"
21 #include "device.h"
22 #include "chsc.h"
23 #include "ioasm.h"
24 #include "chp.h"
26 static int timeout_log_enabled;
28 static int __init ccw_timeout_log_setup(char *unused)
30 timeout_log_enabled = 1;
31 return 1;
34 __setup("ccw_timeout_log", ccw_timeout_log_setup);
36 static void ccw_timeout_log(struct ccw_device *cdev)
38 struct schib schib;
39 struct subchannel *sch;
40 struct io_subchannel_private *private;
41 union orb *orb;
42 int cc;
44 sch = to_subchannel(cdev->dev.parent);
45 private = to_io_private(sch);
46 orb = &private->orb;
47 cc = stsch_err(sch->schid, &schib);
49 printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
50 "device information:\n", get_tod_clock());
51 printk(KERN_WARNING "cio: orb:\n");
52 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
53 orb, sizeof(*orb), 0);
54 printk(KERN_WARNING "cio: ccw device bus id: %s\n",
55 dev_name(&cdev->dev));
56 printk(KERN_WARNING "cio: subchannel bus id: %s\n",
57 dev_name(&sch->dev));
58 printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
59 "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);
61 if (orb->tm.b) {
62 printk(KERN_WARNING "cio: orb indicates transport mode\n");
63 printk(KERN_WARNING "cio: last tcw:\n");
64 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
65 (void *)(addr_t)orb->tm.tcw,
66 sizeof(struct tcw), 0);
67 } else {
68 printk(KERN_WARNING "cio: orb indicates command mode\n");
69 if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
70 (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
71 printk(KERN_WARNING "cio: last channel program "
72 "(intern):\n");
73 else
74 printk(KERN_WARNING "cio: last channel program:\n");
76 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
77 (void *)(addr_t)orb->cmd.cpa,
78 sizeof(struct ccw1), 0);
80 printk(KERN_WARNING "cio: ccw device state: %d\n",
81 cdev->private->state);
82 printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
83 printk(KERN_WARNING "cio: schib:\n");
84 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
85 &schib, sizeof(schib), 0);
86 printk(KERN_WARNING "cio: ccw device flags:\n");
87 print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1,
88 &cdev->private->flags, sizeof(cdev->private->flags), 0);
92 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
94 static void
95 ccw_device_timeout(unsigned long data)
97 struct ccw_device *cdev;
99 cdev = (struct ccw_device *) data;
100 spin_lock_irq(cdev->ccwlock);
101 if (timeout_log_enabled)
102 ccw_timeout_log(cdev);
103 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
104 spin_unlock_irq(cdev->ccwlock);
108 * Set timeout
110 void
111 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
113 if (expires == 0) {
114 del_timer(&cdev->private->timer);
115 return;
117 if (timer_pending(&cdev->private->timer)) {
118 if (mod_timer(&cdev->private->timer, jiffies + expires))
119 return;
121 cdev->private->timer.function = ccw_device_timeout;
122 cdev->private->timer.data = (unsigned long) cdev;
123 cdev->private->timer.expires = jiffies + expires;
124 add_timer(&cdev->private->timer);
128 * Cancel running i/o. This is called repeatedly since halt/clear are
129 * asynchronous operations. We do one try with cio_cancel, two tries
130 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
131 * Returns 0 if device now idle, -ENODEV for device not operational and
132 * -EBUSY if an interrupt is expected (either from halt/clear or from a
133 * status pending).
136 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
138 struct subchannel *sch;
139 int ret;
141 sch = to_subchannel(cdev->dev.parent);
142 if (cio_update_schib(sch))
143 return -ENODEV;
144 if (!sch->schib.pmcw.ena)
145 /* Not operational -> done. */
146 return 0;
147 /* Stage 1: cancel io. */
148 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
149 !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
150 if (!scsw_is_tm(&sch->schib.scsw)) {
151 ret = cio_cancel(sch);
152 if (ret != -EINVAL)
153 return ret;
155 /* cancel io unsuccessful or not applicable (transport mode).
156 * Continue with asynchronous instructions. */
157 cdev->private->iretry = 3; /* 3 halt retries. */
159 if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
160 /* Stage 2: halt io. */
161 if (cdev->private->iretry) {
162 cdev->private->iretry--;
163 ret = cio_halt(sch);
164 if (ret != -EBUSY)
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 /* Function was unsuccessful */
177 CIO_MSG_EVENT(0, "0.%x.%04x: could not stop I/O\n",
178 cdev->private->dev_id.ssid, cdev->private->dev_id.devno);
179 return -EIO;
182 void ccw_device_update_sense_data(struct ccw_device *cdev)
184 memset(&cdev->id, 0, sizeof(cdev->id));
185 cdev->id.cu_type = cdev->private->senseid.cu_type;
186 cdev->id.cu_model = cdev->private->senseid.cu_model;
187 cdev->id.dev_type = cdev->private->senseid.dev_type;
188 cdev->id.dev_model = cdev->private->senseid.dev_model;
191 int ccw_device_test_sense_data(struct ccw_device *cdev)
193 return cdev->id.cu_type == cdev->private->senseid.cu_type &&
194 cdev->id.cu_model == cdev->private->senseid.cu_model &&
195 cdev->id.dev_type == cdev->private->senseid.dev_type &&
196 cdev->id.dev_model == cdev->private->senseid.dev_model;
200 * The machine won't give us any notification by machine check if a chpid has
201 * been varied online on the SE so we have to find out by magic (i. e. driving
202 * the channel subsystem to device selection and updating our path masks).
204 static void
205 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
207 int mask, i;
208 struct chp_id chpid;
210 chp_id_init(&chpid);
211 for (i = 0; i<8; i++) {
212 mask = 0x80 >> i;
213 if (!(sch->lpm & mask))
214 continue;
215 if (old_lpm & mask)
216 continue;
217 chpid.id = sch->schib.pmcw.chpid[i];
218 if (!chp_is_registered(chpid))
219 css_schedule_eval_all();
224 * Stop device recognition.
226 static void
227 ccw_device_recog_done(struct ccw_device *cdev, int state)
229 struct subchannel *sch;
230 int old_lpm;
232 sch = to_subchannel(cdev->dev.parent);
234 if (cio_disable_subchannel(sch))
235 state = DEV_STATE_NOT_OPER;
237 * Now that we tried recognition, we have performed device selection
238 * through ssch() and the path information is up to date.
240 old_lpm = sch->lpm;
242 /* Check since device may again have become not operational. */
243 if (cio_update_schib(sch))
244 state = DEV_STATE_NOT_OPER;
245 else
246 sch->lpm = sch->schib.pmcw.pam & sch->opm;
248 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
249 /* Force reprobe on all chpids. */
250 old_lpm = 0;
251 if (sch->lpm != old_lpm)
252 __recover_lost_chpids(sch, old_lpm);
253 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
254 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
255 cdev->private->flags.recog_done = 1;
256 cdev->private->state = DEV_STATE_DISCONNECTED;
257 wake_up(&cdev->private->wait_q);
258 return;
260 if (cdev->private->flags.resuming) {
261 cdev->private->state = state;
262 cdev->private->flags.recog_done = 1;
263 wake_up(&cdev->private->wait_q);
264 return;
266 switch (state) {
267 case DEV_STATE_NOT_OPER:
268 break;
269 case DEV_STATE_OFFLINE:
270 if (!cdev->online) {
271 ccw_device_update_sense_data(cdev);
272 break;
274 cdev->private->state = DEV_STATE_OFFLINE;
275 cdev->private->flags.recog_done = 1;
276 if (ccw_device_test_sense_data(cdev)) {
277 cdev->private->flags.donotify = 1;
278 ccw_device_online(cdev);
279 wake_up(&cdev->private->wait_q);
280 } else {
281 ccw_device_update_sense_data(cdev);
282 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
284 return;
285 case DEV_STATE_BOXED:
286 if (cdev->id.cu_type != 0) { /* device was recognized before */
287 cdev->private->flags.recog_done = 1;
288 cdev->private->state = DEV_STATE_BOXED;
289 wake_up(&cdev->private->wait_q);
290 return;
292 break;
294 cdev->private->state = state;
295 io_subchannel_recog_done(cdev);
296 wake_up(&cdev->private->wait_q);
300 * Function called from device_id.c after sense id has completed.
302 void
303 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
305 switch (err) {
306 case 0:
307 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
308 break;
309 case -ETIME: /* Sense id stopped by timeout. */
310 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
311 break;
312 default:
313 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
314 break;
319 * ccw_device_notify() - inform the device's driver about an event
320 * @cdev: device for which an event occurred
321 * @event: event that occurred
323 * Returns:
324 * -%EINVAL if the device is offline or has no driver.
325 * -%EOPNOTSUPP if the device's driver has no notifier registered.
326 * %NOTIFY_OK if the driver wants to keep the device.
327 * %NOTIFY_BAD if the driver doesn't want to keep the device.
329 int ccw_device_notify(struct ccw_device *cdev, int event)
331 int ret = -EINVAL;
333 if (!cdev->drv)
334 goto out;
335 if (!cdev->online)
336 goto out;
337 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
338 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
339 event);
340 if (!cdev->drv->notify) {
341 ret = -EOPNOTSUPP;
342 goto out;
344 if (cdev->drv->notify(cdev, event))
345 ret = NOTIFY_OK;
346 else
347 ret = NOTIFY_BAD;
348 out:
349 return ret;
352 static void ccw_device_oper_notify(struct ccw_device *cdev)
354 struct subchannel *sch = to_subchannel(cdev->dev.parent);
356 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
357 /* Reenable channel measurements, if needed. */
358 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
359 /* Save indication for new paths. */
360 cdev->private->path_new_mask = sch->vpm;
361 return;
363 /* Driver doesn't want device back. */
364 ccw_device_set_notoper(cdev);
365 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
369 * Finished with online/offline processing.
371 static void
372 ccw_device_done(struct ccw_device *cdev, int state)
374 struct subchannel *sch;
376 sch = to_subchannel(cdev->dev.parent);
378 ccw_device_set_timeout(cdev, 0);
380 if (state != DEV_STATE_ONLINE)
381 cio_disable_subchannel(sch);
383 /* Reset device status. */
384 memset(&cdev->private->irb, 0, sizeof(struct irb));
386 cdev->private->state = state;
388 switch (state) {
389 case DEV_STATE_BOXED:
390 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
391 cdev->private->dev_id.devno, sch->schid.sch_no);
392 if (cdev->online &&
393 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK)
394 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
395 cdev->private->flags.donotify = 0;
396 break;
397 case DEV_STATE_NOT_OPER:
398 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
399 cdev->private->dev_id.devno, sch->schid.sch_no);
400 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
401 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
402 else
403 ccw_device_set_disconnected(cdev);
404 cdev->private->flags.donotify = 0;
405 break;
406 case DEV_STATE_DISCONNECTED:
407 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
408 "%04x\n", cdev->private->dev_id.devno,
409 sch->schid.sch_no);
410 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) {
411 cdev->private->state = DEV_STATE_NOT_OPER;
412 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
413 } else
414 ccw_device_set_disconnected(cdev);
415 cdev->private->flags.donotify = 0;
416 break;
417 default:
418 break;
421 if (cdev->private->flags.donotify) {
422 cdev->private->flags.donotify = 0;
423 ccw_device_oper_notify(cdev);
425 wake_up(&cdev->private->wait_q);
429 * Start device recognition.
431 void ccw_device_recognition(struct ccw_device *cdev)
433 struct subchannel *sch = to_subchannel(cdev->dev.parent);
436 * We used to start here with a sense pgid to find out whether a device
437 * is locked by someone else. Unfortunately, the sense pgid command
438 * code has other meanings on devices predating the path grouping
439 * algorithm, so we start with sense id and box the device after an
440 * timeout (or if sense pgid during path verification detects the device
441 * is locked, as may happen on newer devices).
443 cdev->private->flags.recog_done = 0;
444 cdev->private->state = DEV_STATE_SENSE_ID;
445 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
446 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
447 return;
449 ccw_device_sense_id_start(cdev);
453 * Handle events for states that use the ccw request infrastructure.
455 static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
457 switch (e) {
458 case DEV_EVENT_NOTOPER:
459 ccw_request_notoper(cdev);
460 break;
461 case DEV_EVENT_INTERRUPT:
462 ccw_request_handler(cdev);
463 break;
464 case DEV_EVENT_TIMEOUT:
465 ccw_request_timeout(cdev);
466 break;
467 default:
468 break;
472 static void ccw_device_report_path_events(struct ccw_device *cdev)
474 struct subchannel *sch = to_subchannel(cdev->dev.parent);
475 int path_event[8];
476 int chp, mask;
478 for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
479 path_event[chp] = PE_NONE;
480 if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
481 path_event[chp] |= PE_PATH_GONE;
482 if (mask & cdev->private->path_new_mask & sch->vpm)
483 path_event[chp] |= PE_PATH_AVAILABLE;
484 if (mask & cdev->private->pgid_reset_mask & sch->vpm)
485 path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
487 if (cdev->online && cdev->drv->path_event)
488 cdev->drv->path_event(cdev, path_event);
491 static void ccw_device_reset_path_events(struct ccw_device *cdev)
493 cdev->private->path_gone_mask = 0;
494 cdev->private->path_new_mask = 0;
495 cdev->private->pgid_reset_mask = 0;
498 static void create_fake_irb(struct irb *irb, int type)
500 memset(irb, 0, sizeof(*irb));
501 if (type == FAKE_CMD_IRB) {
502 struct cmd_scsw *scsw = &irb->scsw.cmd;
503 scsw->cc = 1;
504 scsw->fctl = SCSW_FCTL_START_FUNC;
505 scsw->actl = SCSW_ACTL_START_PEND;
506 scsw->stctl = SCSW_STCTL_STATUS_PEND;
507 } else if (type == FAKE_TM_IRB) {
508 struct tm_scsw *scsw = &irb->scsw.tm;
509 scsw->x = 1;
510 scsw->cc = 1;
511 scsw->fctl = SCSW_FCTL_START_FUNC;
512 scsw->actl = SCSW_ACTL_START_PEND;
513 scsw->stctl = SCSW_STCTL_STATUS_PEND;
517 void ccw_device_verify_done(struct ccw_device *cdev, int err)
519 struct subchannel *sch;
521 sch = to_subchannel(cdev->dev.parent);
522 /* Update schib - pom may have changed. */
523 if (cio_update_schib(sch)) {
524 err = -ENODEV;
525 goto callback;
527 /* Update lpm with verified path mask. */
528 sch->lpm = sch->vpm;
529 /* Repeat path verification? */
530 if (cdev->private->flags.doverify) {
531 ccw_device_verify_start(cdev);
532 return;
534 callback:
535 switch (err) {
536 case 0:
537 ccw_device_done(cdev, DEV_STATE_ONLINE);
538 /* Deliver fake irb to device driver, if needed. */
539 if (cdev->private->flags.fake_irb) {
540 create_fake_irb(&cdev->private->irb,
541 cdev->private->flags.fake_irb);
542 cdev->private->flags.fake_irb = 0;
543 if (cdev->handler)
544 cdev->handler(cdev, cdev->private->intparm,
545 &cdev->private->irb);
546 memset(&cdev->private->irb, 0, sizeof(struct irb));
548 ccw_device_report_path_events(cdev);
549 break;
550 case -ETIME:
551 case -EUSERS:
552 /* Reset oper notify indication after verify error. */
553 cdev->private->flags.donotify = 0;
554 ccw_device_done(cdev, DEV_STATE_BOXED);
555 break;
556 case -EACCES:
557 /* Reset oper notify indication after verify error. */
558 cdev->private->flags.donotify = 0;
559 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
560 break;
561 default:
562 /* Reset oper notify indication after verify error. */
563 cdev->private->flags.donotify = 0;
564 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
565 break;
567 ccw_device_reset_path_events(cdev);
571 * Get device online.
574 ccw_device_online(struct ccw_device *cdev)
576 struct subchannel *sch;
577 int ret;
579 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
580 (cdev->private->state != DEV_STATE_BOXED))
581 return -EINVAL;
582 sch = to_subchannel(cdev->dev.parent);
583 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
584 if (ret != 0) {
585 /* Couldn't enable the subchannel for i/o. Sick device. */
586 if (ret == -ENODEV)
587 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
588 return ret;
590 /* Start initial path verification. */
591 cdev->private->state = DEV_STATE_VERIFY;
592 ccw_device_verify_start(cdev);
593 return 0;
596 void
597 ccw_device_disband_done(struct ccw_device *cdev, int err)
599 switch (err) {
600 case 0:
601 ccw_device_done(cdev, DEV_STATE_OFFLINE);
602 break;
603 case -ETIME:
604 ccw_device_done(cdev, DEV_STATE_BOXED);
605 break;
606 default:
607 cdev->private->flags.donotify = 0;
608 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
609 break;
614 * Shutdown device.
617 ccw_device_offline(struct ccw_device *cdev)
619 struct subchannel *sch;
621 /* Allow ccw_device_offline while disconnected. */
622 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
623 cdev->private->state == DEV_STATE_NOT_OPER) {
624 cdev->private->flags.donotify = 0;
625 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
626 return 0;
628 if (cdev->private->state == DEV_STATE_BOXED) {
629 ccw_device_done(cdev, DEV_STATE_BOXED);
630 return 0;
632 if (ccw_device_is_orphan(cdev)) {
633 ccw_device_done(cdev, DEV_STATE_OFFLINE);
634 return 0;
636 sch = to_subchannel(cdev->dev.parent);
637 if (cio_update_schib(sch))
638 return -ENODEV;
639 if (scsw_actl(&sch->schib.scsw) != 0)
640 return -EBUSY;
641 if (cdev->private->state != DEV_STATE_ONLINE)
642 return -EINVAL;
643 /* Are we doing path grouping? */
644 if (!cdev->private->flags.pgroup) {
645 /* No, set state offline immediately. */
646 ccw_device_done(cdev, DEV_STATE_OFFLINE);
647 return 0;
649 /* Start Set Path Group commands. */
650 cdev->private->state = DEV_STATE_DISBAND_PGID;
651 ccw_device_disband_start(cdev);
652 return 0;
656 * Handle not operational event in non-special state.
658 static void ccw_device_generic_notoper(struct ccw_device *cdev,
659 enum dev_event dev_event)
661 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
662 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
663 else
664 ccw_device_set_disconnected(cdev);
668 * Handle path verification event in offline state.
670 static void ccw_device_offline_verify(struct ccw_device *cdev,
671 enum dev_event dev_event)
673 struct subchannel *sch = to_subchannel(cdev->dev.parent);
675 css_schedule_eval(sch->schid);
679 * Handle path verification event.
681 static void
682 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
684 struct subchannel *sch;
686 if (cdev->private->state == DEV_STATE_W4SENSE) {
687 cdev->private->flags.doverify = 1;
688 return;
690 sch = to_subchannel(cdev->dev.parent);
692 * Since we might not just be coming from an interrupt from the
693 * subchannel we have to update the schib.
695 if (cio_update_schib(sch)) {
696 ccw_device_verify_done(cdev, -ENODEV);
697 return;
700 if (scsw_actl(&sch->schib.scsw) != 0 ||
701 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
702 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
704 * No final status yet or final status not yet delivered
705 * to the device driver. Can't do path verification now,
706 * delay until final status was delivered.
708 cdev->private->flags.doverify = 1;
709 return;
711 /* Device is idle, we can do the path verification. */
712 cdev->private->state = DEV_STATE_VERIFY;
713 ccw_device_verify_start(cdev);
717 * Handle path verification event in boxed state.
719 static void ccw_device_boxed_verify(struct ccw_device *cdev,
720 enum dev_event dev_event)
722 struct subchannel *sch = to_subchannel(cdev->dev.parent);
724 if (cdev->online) {
725 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
726 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
727 else
728 ccw_device_online_verify(cdev, dev_event);
729 } else
730 css_schedule_eval(sch->schid);
734 * Got an interrupt for a normal io (state online).
736 static void
737 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
739 struct irb *irb;
740 int is_cmd;
742 irb = (struct irb *)&S390_lowcore.irb;
743 is_cmd = !scsw_is_tm(&irb->scsw);
744 /* Check for unsolicited interrupt. */
745 if (!scsw_is_solicited(&irb->scsw)) {
746 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
747 !irb->esw.esw0.erw.cons) {
748 /* Unit check but no sense data. Need basic sense. */
749 if (ccw_device_do_sense(cdev, irb) != 0)
750 goto call_handler_unsol;
751 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
752 cdev->private->state = DEV_STATE_W4SENSE;
753 cdev->private->intparm = 0;
754 return;
756 call_handler_unsol:
757 if (cdev->handler)
758 cdev->handler (cdev, 0, irb);
759 if (cdev->private->flags.doverify)
760 ccw_device_online_verify(cdev, 0);
761 return;
763 /* Accumulate status and find out if a basic sense is needed. */
764 ccw_device_accumulate_irb(cdev, irb);
765 if (is_cmd && cdev->private->flags.dosense) {
766 if (ccw_device_do_sense(cdev, irb) == 0) {
767 cdev->private->state = DEV_STATE_W4SENSE;
769 return;
771 /* Call the handler. */
772 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
773 /* Start delayed path verification. */
774 ccw_device_online_verify(cdev, 0);
778 * Got an timeout in online state.
780 static void
781 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
783 int ret;
785 ccw_device_set_timeout(cdev, 0);
786 cdev->private->iretry = 255;
787 ret = ccw_device_cancel_halt_clear(cdev);
788 if (ret == -EBUSY) {
789 ccw_device_set_timeout(cdev, 3*HZ);
790 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
791 return;
793 if (ret)
794 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
795 else if (cdev->handler)
796 cdev->handler(cdev, cdev->private->intparm,
797 ERR_PTR(-ETIMEDOUT));
801 * Got an interrupt for a basic sense.
803 static void
804 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
806 struct irb *irb;
808 irb = (struct irb *)&S390_lowcore.irb;
809 /* Check for unsolicited interrupt. */
810 if (scsw_stctl(&irb->scsw) ==
811 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
812 if (scsw_cc(&irb->scsw) == 1)
813 /* Basic sense hasn't started. Try again. */
814 ccw_device_do_sense(cdev, irb);
815 else {
816 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
817 "interrupt during w4sense...\n",
818 cdev->private->dev_id.ssid,
819 cdev->private->dev_id.devno);
820 if (cdev->handler)
821 cdev->handler (cdev, 0, irb);
823 return;
826 * Check if a halt or clear has been issued in the meanwhile. If yes,
827 * only deliver the halt/clear interrupt to the device driver as if it
828 * had killed the original request.
830 if (scsw_fctl(&irb->scsw) &
831 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
832 cdev->private->flags.dosense = 0;
833 memset(&cdev->private->irb, 0, sizeof(struct irb));
834 ccw_device_accumulate_irb(cdev, irb);
835 goto call_handler;
837 /* Add basic sense info to irb. */
838 ccw_device_accumulate_basic_sense(cdev, irb);
839 if (cdev->private->flags.dosense) {
840 /* Another basic sense is needed. */
841 ccw_device_do_sense(cdev, irb);
842 return;
844 call_handler:
845 cdev->private->state = DEV_STATE_ONLINE;
846 /* In case sensing interfered with setting the device online */
847 wake_up(&cdev->private->wait_q);
848 /* Call the handler. */
849 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
850 /* Start delayed path verification. */
851 ccw_device_online_verify(cdev, 0);
854 static void
855 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
857 ccw_device_set_timeout(cdev, 0);
858 /* Start delayed path verification. */
859 ccw_device_online_verify(cdev, 0);
860 /* OK, i/o is dead now. Call interrupt handler. */
861 if (cdev->handler)
862 cdev->handler(cdev, cdev->private->intparm,
863 ERR_PTR(-EIO));
866 static void
867 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
869 int ret;
871 ret = ccw_device_cancel_halt_clear(cdev);
872 if (ret == -EBUSY) {
873 ccw_device_set_timeout(cdev, 3*HZ);
874 return;
876 /* Start delayed path verification. */
877 ccw_device_online_verify(cdev, 0);
878 if (cdev->handler)
879 cdev->handler(cdev, cdev->private->intparm,
880 ERR_PTR(-EIO));
883 void ccw_device_kill_io(struct ccw_device *cdev)
885 int ret;
887 cdev->private->iretry = 255;
888 ret = ccw_device_cancel_halt_clear(cdev);
889 if (ret == -EBUSY) {
890 ccw_device_set_timeout(cdev, 3*HZ);
891 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
892 return;
894 /* Start delayed path verification. */
895 ccw_device_online_verify(cdev, 0);
896 if (cdev->handler)
897 cdev->handler(cdev, cdev->private->intparm,
898 ERR_PTR(-EIO));
901 static void
902 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
904 /* Start verification after current task finished. */
905 cdev->private->flags.doverify = 1;
908 static void
909 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
911 struct subchannel *sch;
913 sch = to_subchannel(cdev->dev.parent);
914 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
915 /* Couldn't enable the subchannel for i/o. Sick device. */
916 return;
917 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
918 ccw_device_sense_id_start(cdev);
921 void ccw_device_trigger_reprobe(struct ccw_device *cdev)
923 struct subchannel *sch;
925 if (cdev->private->state != DEV_STATE_DISCONNECTED)
926 return;
928 sch = to_subchannel(cdev->dev.parent);
929 /* Update some values. */
930 if (cio_update_schib(sch))
931 return;
933 * The pim, pam, pom values may not be accurate, but they are the best
934 * we have before performing device selection :/
936 sch->lpm = sch->schib.pmcw.pam & sch->opm;
938 * Use the initial configuration since we can't be shure that the old
939 * paths are valid.
941 io_subchannel_init_config(sch);
942 if (cio_commit_config(sch))
943 return;
945 /* We should also udate ssd info, but this has to wait. */
946 /* Check if this is another device which appeared on the same sch. */
947 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
948 css_schedule_eval(sch->schid);
949 else
950 ccw_device_start_id(cdev, 0);
953 static void ccw_device_disabled_irq(struct ccw_device *cdev,
954 enum dev_event dev_event)
956 struct subchannel *sch;
958 sch = to_subchannel(cdev->dev.parent);
960 * An interrupt in a disabled state means a previous disable was not
961 * successful - should not happen, but we try to disable again.
963 cio_disable_subchannel(sch);
966 static void
967 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
969 retry_set_schib(cdev);
970 cdev->private->state = DEV_STATE_ONLINE;
971 dev_fsm_event(cdev, dev_event);
974 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
975 enum dev_event dev_event)
977 cmf_retry_copy_block(cdev);
978 cdev->private->state = DEV_STATE_ONLINE;
979 dev_fsm_event(cdev, dev_event);
982 static void
983 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
985 ccw_device_set_timeout(cdev, 0);
986 cdev->private->state = DEV_STATE_NOT_OPER;
987 wake_up(&cdev->private->wait_q);
990 static void
991 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
993 int ret;
995 ret = ccw_device_cancel_halt_clear(cdev);
996 if (ret == -EBUSY) {
997 ccw_device_set_timeout(cdev, HZ/10);
998 } else {
999 cdev->private->state = DEV_STATE_NOT_OPER;
1000 wake_up(&cdev->private->wait_q);
1005 * No operation action. This is used e.g. to ignore a timeout event in
1006 * state offline.
1008 static void
1009 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1014 * device statemachine
1016 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1017 [DEV_STATE_NOT_OPER] = {
1018 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1019 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1020 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1021 [DEV_EVENT_VERIFY] = ccw_device_nop,
1023 [DEV_STATE_SENSE_PGID] = {
1024 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1025 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1026 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1027 [DEV_EVENT_VERIFY] = ccw_device_nop,
1029 [DEV_STATE_SENSE_ID] = {
1030 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1031 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1032 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1033 [DEV_EVENT_VERIFY] = ccw_device_nop,
1035 [DEV_STATE_OFFLINE] = {
1036 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1037 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1038 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1039 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1041 [DEV_STATE_VERIFY] = {
1042 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1043 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1044 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1045 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1047 [DEV_STATE_ONLINE] = {
1048 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1049 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1050 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1051 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1053 [DEV_STATE_W4SENSE] = {
1054 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1055 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1056 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1057 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1059 [DEV_STATE_DISBAND_PGID] = {
1060 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1061 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1062 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1063 [DEV_EVENT_VERIFY] = ccw_device_nop,
1065 [DEV_STATE_BOXED] = {
1066 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1067 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
1068 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1069 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1071 /* states to wait for i/o completion before doing something */
1072 [DEV_STATE_TIMEOUT_KILL] = {
1073 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1074 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1075 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1076 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1078 [DEV_STATE_QUIESCE] = {
1079 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1080 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1081 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1082 [DEV_EVENT_VERIFY] = ccw_device_nop,
1084 /* special states for devices gone not operational */
1085 [DEV_STATE_DISCONNECTED] = {
1086 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1087 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1088 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1089 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1091 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1092 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1093 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1094 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1095 [DEV_EVENT_VERIFY] = ccw_device_nop,
1097 [DEV_STATE_CMFCHANGE] = {
1098 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1099 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1100 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1101 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1103 [DEV_STATE_CMFUPDATE] = {
1104 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1105 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1106 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1107 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1109 [DEV_STATE_STEAL_LOCK] = {
1110 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1111 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1112 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1113 [DEV_EVENT_VERIFY] = ccw_device_nop,
1117 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);