Merge branch 'for-linus' of gregkh@master.kernel.org:/pub/scm/linux/kernel/git/dtor...
[linux-2.6] / drivers / s390 / cio / device_fsm.c
1 /*
2  * drivers/s390/cio/device_fsm.c
3  * finite state machine for device handling
4  *
5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6  *                       IBM Corporation
7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
9  */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/jiffies.h>
14 #include <linux/string.h>
15
16 #include <asm/ccwdev.h>
17 #include <asm/cio.h>
18
19 #include "cio.h"
20 #include "cio_debug.h"
21 #include "css.h"
22 #include "device.h"
23 #include "chsc.h"
24 #include "ioasm.h"
25
26 int
27 device_is_online(struct subchannel *sch)
28 {
29         struct ccw_device *cdev;
30
31         if (!sch->dev.driver_data)
32                 return 0;
33         cdev = sch->dev.driver_data;
34         return (cdev->private->state == DEV_STATE_ONLINE);
35 }
36
37 int
38 device_is_disconnected(struct subchannel *sch)
39 {
40         struct ccw_device *cdev;
41
42         if (!sch->dev.driver_data)
43                 return 0;
44         cdev = sch->dev.driver_data;
45         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
46                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
47 }
48
49 void
50 device_set_disconnected(struct subchannel *sch)
51 {
52         struct ccw_device *cdev;
53
54         if (!sch->dev.driver_data)
55                 return;
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;
60 }
61
62 void
63 device_set_waiting(struct subchannel *sch)
64 {
65         struct ccw_device *cdev;
66
67         if (!sch->dev.driver_data)
68                 return;
69         cdev = sch->dev.driver_data;
70         ccw_device_set_timeout(cdev, 10*HZ);
71         cdev->private->state = DEV_STATE_WAIT4IO;
72 }
73
74 /*
75  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
76  */
77 static void
78 ccw_device_timeout(unsigned long data)
79 {
80         struct ccw_device *cdev;
81
82         cdev = (struct ccw_device *) data;
83         spin_lock_irq(cdev->ccwlock);
84         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
85         spin_unlock_irq(cdev->ccwlock);
86 }
87
88 /*
89  * Set timeout
90  */
91 void
92 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
93 {
94         if (expires == 0) {
95                 del_timer(&cdev->private->timer);
96                 return;
97         }
98         if (timer_pending(&cdev->private->timer)) {
99                 if (mod_timer(&cdev->private->timer, jiffies + expires))
100                         return;
101         }
102         cdev->private->timer.function = ccw_device_timeout;
103         cdev->private->timer.data = (unsigned long) cdev;
104         cdev->private->timer.expires = jiffies + expires;
105         add_timer(&cdev->private->timer);
106 }
107
108 /* Kill any pending timers after machine check. */
109 void
110 device_kill_pending_timer(struct subchannel *sch)
111 {
112         struct ccw_device *cdev;
113
114         if (!sch->dev.driver_data)
115                 return;
116         cdev = sch->dev.driver_data;
117         ccw_device_set_timeout(cdev, 0);
118 }
119
120 /*
121  * Cancel running i/o. This is called repeatedly since halt/clear are
122  * asynchronous operations. We do one try with cio_cancel, two tries
123  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
124  * Returns 0 if device now idle, -ENODEV for device not operational and
125  * -EBUSY if an interrupt is expected (either from halt/clear or from a
126  * status pending).
127  */
128 int
129 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
130 {
131         struct subchannel *sch;
132         int ret;
133
134         sch = to_subchannel(cdev->dev.parent);
135         ret = stsch(sch->schid, &sch->schib);
136         if (ret || !sch->schib.pmcw.dnv)
137                 return -ENODEV; 
138         if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
139                 /* Not operational or no activity -> done. */
140                 return 0;
141         /* Stage 1: cancel io. */
142         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
143             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
144                 ret = cio_cancel(sch);
145                 if (ret != -EINVAL)
146                         return ret;
147                 /* cancel io unsuccessful. From now on it is asynchronous. */
148                 cdev->private->iretry = 3;      /* 3 halt retries. */
149         }
150         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
151                 /* Stage 2: halt io. */
152                 if (cdev->private->iretry) {
153                         cdev->private->iretry--;
154                         ret = cio_halt(sch);
155                         if (ret != -EBUSY)
156                                 return (ret == 0) ? -EBUSY : ret;
157                 }
158                 /* halt io unsuccessful. */
159                 cdev->private->iretry = 255;    /* 255 clear retries. */
160         }
161         /* Stage 3: clear io. */
162         if (cdev->private->iretry) {
163                 cdev->private->iretry--;
164                 ret = cio_clear (sch);
165                 return (ret == 0) ? -EBUSY : ret;
166         }
167         panic("Can't stop i/o on subchannel.\n");
168 }
169
170 static int
171 ccw_device_handle_oper(struct ccw_device *cdev)
172 {
173         struct subchannel *sch;
174
175         sch = to_subchannel(cdev->dev.parent);
176         cdev->private->flags.recog_done = 1;
177         /*
178          * Check if cu type and device type still match. If
179          * not, it is certainly another device and we have to
180          * de- and re-register. Also check here for non-matching devno.
181          */
182         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
183             cdev->id.cu_model != cdev->private->senseid.cu_model ||
184             cdev->id.dev_type != cdev->private->senseid.dev_type ||
185             cdev->id.dev_model != cdev->private->senseid.dev_model ||
186             cdev->private->devno != sch->schib.pmcw.dev) {
187                 PREPARE_WORK(&cdev->private->kick_work,
188                              ccw_device_do_unreg_rereg, (void *)cdev);
189                 queue_work(ccw_device_work, &cdev->private->kick_work);
190                 return 0;
191         }
192         cdev->private->flags.donotify = 1;
193         return 1;
194 }
195
196 /*
197  * The machine won't give us any notification by machine check if a chpid has
198  * been varied online on the SE so we have to find out by magic (i. e. driving
199  * the channel subsystem to device selection and updating our path masks).
200  */
201 static inline void
202 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
203 {
204         int mask, i;
205
206         for (i = 0; i<8; i++) {
207                 mask = 0x80 >> i;
208                 if (!(sch->lpm & mask))
209                         continue;
210                 if (old_lpm & mask)
211                         continue;
212                 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
213         }
214 }
215
216 /*
217  * Stop device recognition.
218  */
219 static void
220 ccw_device_recog_done(struct ccw_device *cdev, int state)
221 {
222         struct subchannel *sch;
223         int notify, old_lpm, same_dev;
224
225         sch = to_subchannel(cdev->dev.parent);
226
227         ccw_device_set_timeout(cdev, 0);
228         cio_disable_subchannel(sch);
229         /*
230          * Now that we tried recognition, we have performed device selection
231          * through ssch() and the path information is up to date.
232          */
233         old_lpm = sch->lpm;
234         stsch(sch->schid, &sch->schib);
235         sch->lpm = sch->schib.pmcw.pim &
236                 sch->schib.pmcw.pam &
237                 sch->schib.pmcw.pom &
238                 sch->opm;
239         /* Check since device may again have become not operational. */
240         if (!sch->schib.pmcw.dnv)
241                 state = DEV_STATE_NOT_OPER;
242         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
243                 /* Force reprobe on all chpids. */
244                 old_lpm = 0;
245         if (sch->lpm != old_lpm)
246                 __recover_lost_chpids(sch, old_lpm);
247         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
248                 if (state == DEV_STATE_NOT_OPER) {
249                         cdev->private->flags.recog_done = 1;
250                         cdev->private->state = DEV_STATE_DISCONNECTED;
251                         return;
252                 }
253                 /* Boxed devices don't need extra treatment. */
254         }
255         notify = 0;
256         same_dev = 0; /* Keep the compiler quiet... */
257         switch (state) {
258         case DEV_STATE_NOT_OPER:
259                 CIO_DEBUG(KERN_WARNING, 2,
260                           "SenseID : unknown device %04x on subchannel "
261                           "0.%x.%04x\n", cdev->private->devno,
262                           sch->schid.ssid, sch->schid.sch_no);
263                 break;
264         case DEV_STATE_OFFLINE:
265                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
266                         same_dev = ccw_device_handle_oper(cdev);
267                         notify = 1;
268                 }
269                 /* fill out sense information */
270                 cdev->id = (struct ccw_device_id) {
271                         .cu_type   = cdev->private->senseid.cu_type,
272                         .cu_model  = cdev->private->senseid.cu_model,
273                         .dev_type  = cdev->private->senseid.dev_type,
274                         .dev_model = cdev->private->senseid.dev_model,
275                 };
276                 if (notify) {
277                         cdev->private->state = DEV_STATE_OFFLINE;
278                         if (same_dev) {
279                                 /* Get device online again. */
280                                 ccw_device_online(cdev);
281                                 wake_up(&cdev->private->wait_q);
282                         }
283                         return;
284                 }
285                 /* Issue device info message. */
286                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
287                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
288                           "%04X/%02X\n",
289                           cdev->private->ssid, cdev->private->devno,
290                           cdev->id.cu_type, cdev->id.cu_model,
291                           cdev->id.dev_type, cdev->id.dev_model);
292                 break;
293         case DEV_STATE_BOXED:
294                 CIO_DEBUG(KERN_WARNING, 2,
295                           "SenseID : boxed device %04x on subchannel "
296                           "0.%x.%04x\n", cdev->private->devno,
297                           sch->schid.ssid, sch->schid.sch_no);
298                 break;
299         }
300         cdev->private->state = state;
301         io_subchannel_recog_done(cdev);
302         if (state != DEV_STATE_NOT_OPER)
303                 wake_up(&cdev->private->wait_q);
304 }
305
306 /*
307  * Function called from device_id.c after sense id has completed.
308  */
309 void
310 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
311 {
312         switch (err) {
313         case 0:
314                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
315                 break;
316         case -ETIME:            /* Sense id stopped by timeout. */
317                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
318                 break;
319         default:
320                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
321                 break;
322         }
323 }
324
325 static void
326 ccw_device_oper_notify(void *data)
327 {
328         struct ccw_device *cdev;
329         struct subchannel *sch;
330         int ret;
331
332         cdev = (struct ccw_device *)data;
333         sch = to_subchannel(cdev->dev.parent);
334         ret = (sch->driver && sch->driver->notify) ?
335                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
336         if (!ret)
337                 /* Driver doesn't want device back. */
338                 ccw_device_do_unreg_rereg((void *)cdev);
339         else {
340                 /* Reenable channel measurements, if needed. */
341                 cmf_reenable(cdev);
342                 wake_up(&cdev->private->wait_q);
343         }
344 }
345
346 /*
347  * Finished with online/offline processing.
348  */
349 static void
350 ccw_device_done(struct ccw_device *cdev, int state)
351 {
352         struct subchannel *sch;
353
354         sch = to_subchannel(cdev->dev.parent);
355
356         if (state != DEV_STATE_ONLINE)
357                 cio_disable_subchannel(sch);
358
359         /* Reset device status. */
360         memset(&cdev->private->irb, 0, sizeof(struct irb));
361
362         cdev->private->state = state;
363
364
365         if (state == DEV_STATE_BOXED)
366                 CIO_DEBUG(KERN_WARNING, 2,
367                           "Boxed device %04x on subchannel %04x\n",
368                           cdev->private->devno, sch->schid.sch_no);
369
370         if (cdev->private->flags.donotify) {
371                 cdev->private->flags.donotify = 0;
372                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
373                              (void *)cdev);
374                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
375         }
376         wake_up(&cdev->private->wait_q);
377
378         if (css_init_done && state != DEV_STATE_ONLINE)
379                 put_device (&cdev->dev);
380 }
381
382 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
383 {
384         char *c1;
385         char *c2;
386
387         c1 = (char *)p1;
388         c2 = (char *)p2;
389
390         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
391 }
392
393 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
394 {
395         int i;
396         int last;
397
398         last = 0;
399         for (i = 0; i < 8; i++) {
400                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
401                         /* No PGID yet */
402                         continue;
403                 if (cdev->private->pgid[last].inf.ps.state1 ==
404                     SNID_STATE1_RESET) {
405                         /* First non-zero PGID */
406                         last = i;
407                         continue;
408                 }
409                 if (cmp_pgid(&cdev->private->pgid[i],
410                              &cdev->private->pgid[last]) == 0)
411                         /* Non-conflicting PGIDs */
412                         continue;
413
414                 /* PGID mismatch, can't pathgroup. */
415                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
416                               "0.%x.%04x, can't pathgroup\n",
417                               cdev->private->ssid, cdev->private->devno);
418                 cdev->private->options.pgroup = 0;
419                 return;
420         }
421         if (cdev->private->pgid[last].inf.ps.state1 ==
422             SNID_STATE1_RESET)
423                 /* No previous pgid found */
424                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
425                        sizeof(struct pgid));
426         else
427                 /* Use existing pgid */
428                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
429                        sizeof(struct pgid));
430 }
431
432 /*
433  * Function called from device_pgid.c after sense path ground has completed.
434  */
435 void
436 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
437 {
438         struct subchannel *sch;
439
440         sch = to_subchannel(cdev->dev.parent);
441         switch (err) {
442         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
443                 cdev->private->options.pgroup = 0;
444                 break;
445         case 0: /* success */
446         case -EACCES: /* partial success, some paths not operational */
447                 /* Check if all pgids are equal or 0. */
448                 __ccw_device_get_common_pgid(cdev);
449                 break;
450         case -ETIME:            /* Sense path group id stopped by timeout. */
451         case -EUSERS:           /* device is reserved for someone else. */
452                 ccw_device_done(cdev, DEV_STATE_BOXED);
453                 return;
454         default:
455                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
456                 return;
457         }
458         /* Start Path Group verification. */
459         sch->vpm = 0;   /* Start with no path groups set. */
460         cdev->private->state = DEV_STATE_VERIFY;
461         ccw_device_verify_start(cdev);
462 }
463
464 /*
465  * Start device recognition.
466  */
467 int
468 ccw_device_recognition(struct ccw_device *cdev)
469 {
470         struct subchannel *sch;
471         int ret;
472
473         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
474             (cdev->private->state != DEV_STATE_BOXED))
475                 return -EINVAL;
476         sch = to_subchannel(cdev->dev.parent);
477         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
478         if (ret != 0)
479                 /* Couldn't enable the subchannel for i/o. Sick device. */
480                 return ret;
481
482         /* After 60s the device recognition is considered to have failed. */
483         ccw_device_set_timeout(cdev, 60*HZ);
484
485         /*
486          * We used to start here with a sense pgid to find out whether a device
487          * is locked by someone else. Unfortunately, the sense pgid command
488          * code has other meanings on devices predating the path grouping
489          * algorithm, so we start with sense id and box the device after an
490          * timeout (or if sense pgid during path verification detects the device
491          * is locked, as may happen on newer devices).
492          */
493         cdev->private->flags.recog_done = 0;
494         cdev->private->state = DEV_STATE_SENSE_ID;
495         ccw_device_sense_id_start(cdev);
496         return 0;
497 }
498
499 /*
500  * Handle timeout in device recognition.
501  */
502 static void
503 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
504 {
505         int ret;
506
507         ret = ccw_device_cancel_halt_clear(cdev);
508         switch (ret) {
509         case 0:
510                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
511                 break;
512         case -ENODEV:
513                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
514                 break;
515         default:
516                 ccw_device_set_timeout(cdev, 3*HZ);
517         }
518 }
519
520
521 static void
522 ccw_device_nopath_notify(void *data)
523 {
524         struct ccw_device *cdev;
525         struct subchannel *sch;
526         int ret;
527
528         cdev = (struct ccw_device *)data;
529         sch = to_subchannel(cdev->dev.parent);
530         /* Extra sanity. */
531         if (sch->lpm)
532                 return;
533         ret = (sch->driver && sch->driver->notify) ?
534                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
535         if (!ret) {
536                 if (get_device(&sch->dev)) {
537                         /* Driver doesn't want to keep device. */
538                         cio_disable_subchannel(sch);
539                         if (get_device(&cdev->dev)) {
540                                 PREPARE_WORK(&cdev->private->kick_work,
541                                              ccw_device_call_sch_unregister,
542                                              (void *)cdev);
543                                 queue_work(ccw_device_work,
544                                            &cdev->private->kick_work);
545                         } else
546                                 put_device(&sch->dev);
547                 }
548         } else {
549                 cio_disable_subchannel(sch);
550                 ccw_device_set_timeout(cdev, 0);
551                 cdev->private->flags.fake_irb = 0;
552                 cdev->private->state = DEV_STATE_DISCONNECTED;
553                 wake_up(&cdev->private->wait_q);
554         }
555 }
556
557 void
558 ccw_device_verify_done(struct ccw_device *cdev, int err)
559 {
560         cdev->private->flags.doverify = 0;
561         switch (err) {
562         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
563                 cdev->private->options.pgroup = 0;
564         case 0:
565                 ccw_device_done(cdev, DEV_STATE_ONLINE);
566                 /* Deliver fake irb to device driver, if needed. */
567                 if (cdev->private->flags.fake_irb) {
568                         memset(&cdev->private->irb, 0, sizeof(struct irb));
569                         cdev->private->irb.scsw = (struct scsw) {
570                                 .cc = 1,
571                                 .fctl = SCSW_FCTL_START_FUNC,
572                                 .actl = SCSW_ACTL_START_PEND,
573                                 .stctl = SCSW_STCTL_STATUS_PEND,
574                         };
575                         cdev->private->flags.fake_irb = 0;
576                         if (cdev->handler)
577                                 cdev->handler(cdev, cdev->private->intparm,
578                                               &cdev->private->irb);
579                         memset(&cdev->private->irb, 0, sizeof(struct irb));
580                 }
581                 break;
582         case -ETIME:
583                 ccw_device_done(cdev, DEV_STATE_BOXED);
584                 break;
585         default:
586                 PREPARE_WORK(&cdev->private->kick_work,
587                              ccw_device_nopath_notify, (void *)cdev);
588                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
589                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
590                 break;
591         }
592 }
593
594 /*
595  * Get device online.
596  */
597 int
598 ccw_device_online(struct ccw_device *cdev)
599 {
600         struct subchannel *sch;
601         int ret;
602
603         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
604             (cdev->private->state != DEV_STATE_BOXED))
605                 return -EINVAL;
606         sch = to_subchannel(cdev->dev.parent);
607         if (css_init_done && !get_device(&cdev->dev))
608                 return -ENODEV;
609         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
610         if (ret != 0) {
611                 /* Couldn't enable the subchannel for i/o. Sick device. */
612                 if (ret == -ENODEV)
613                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
614                 return ret;
615         }
616         /* Do we want to do path grouping? */
617         if (!cdev->private->options.pgroup) {
618                 /* Start initial path verification. */
619                 cdev->private->state = DEV_STATE_VERIFY;
620                 ccw_device_verify_start(cdev);
621                 return 0;
622         }
623         /* Do a SensePGID first. */
624         cdev->private->state = DEV_STATE_SENSE_PGID;
625         ccw_device_sense_pgid_start(cdev);
626         return 0;
627 }
628
629 void
630 ccw_device_disband_done(struct ccw_device *cdev, int err)
631 {
632         switch (err) {
633         case 0:
634                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
635                 break;
636         case -ETIME:
637                 ccw_device_done(cdev, DEV_STATE_BOXED);
638                 break;
639         default:
640                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
641                 break;
642         }
643 }
644
645 /*
646  * Shutdown device.
647  */
648 int
649 ccw_device_offline(struct ccw_device *cdev)
650 {
651         struct subchannel *sch;
652
653         sch = to_subchannel(cdev->dev.parent);
654         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
655                 return -ENODEV;
656         if (cdev->private->state != DEV_STATE_ONLINE) {
657                 if (sch->schib.scsw.actl != 0)
658                         return -EBUSY;
659                 return -EINVAL;
660         }
661         if (sch->schib.scsw.actl != 0)
662                 return -EBUSY;
663         /* Are we doing path grouping? */
664         if (!cdev->private->options.pgroup) {
665                 /* No, set state offline immediately. */
666                 sch->vpm = 0;
667                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
668                 return 0;
669         }
670         /* Start Set Path Group commands. */
671         cdev->private->state = DEV_STATE_DISBAND_PGID;
672         ccw_device_disband_start(cdev);
673         return 0;
674 }
675
676 /*
677  * Handle timeout in device online/offline process.
678  */
679 static void
680 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
681 {
682         int ret;
683
684         ret = ccw_device_cancel_halt_clear(cdev);
685         switch (ret) {
686         case 0:
687                 ccw_device_done(cdev, DEV_STATE_BOXED);
688                 break;
689         case -ENODEV:
690                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
691                 break;
692         default:
693                 ccw_device_set_timeout(cdev, 3*HZ);
694         }
695 }
696
697 /*
698  * Handle not oper event in device recognition.
699  */
700 static void
701 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
702 {
703         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
704 }
705
706 /*
707  * Handle not operational event while offline.
708  */
709 static void
710 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
711 {
712         struct subchannel *sch;
713
714         cdev->private->state = DEV_STATE_NOT_OPER;
715         sch = to_subchannel(cdev->dev.parent);
716         if (get_device(&cdev->dev)) {
717                 PREPARE_WORK(&cdev->private->kick_work,
718                              ccw_device_call_sch_unregister, (void *)cdev);
719                 queue_work(ccw_device_work, &cdev->private->kick_work);
720         }
721         wake_up(&cdev->private->wait_q);
722 }
723
724 /*
725  * Handle not operational event while online.
726  */
727 static void
728 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
729 {
730         struct subchannel *sch;
731
732         sch = to_subchannel(cdev->dev.parent);
733         if (sch->driver->notify &&
734             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
735                         ccw_device_set_timeout(cdev, 0);
736                         cdev->private->flags.fake_irb = 0;
737                         cdev->private->state = DEV_STATE_DISCONNECTED;
738                         wake_up(&cdev->private->wait_q);
739                         return;
740         }
741         cdev->private->state = DEV_STATE_NOT_OPER;
742         cio_disable_subchannel(sch);
743         if (sch->schib.scsw.actl != 0) {
744                 // FIXME: not-oper indication to device driver ?
745                 ccw_device_call_handler(cdev);
746         }
747         if (get_device(&cdev->dev)) {
748                 PREPARE_WORK(&cdev->private->kick_work,
749                              ccw_device_call_sch_unregister, (void *)cdev);
750                 queue_work(ccw_device_work, &cdev->private->kick_work);
751         }
752         wake_up(&cdev->private->wait_q);
753 }
754
755 /*
756  * Handle path verification event.
757  */
758 static void
759 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
760 {
761         struct subchannel *sch;
762
763         if (cdev->private->state == DEV_STATE_W4SENSE) {
764                 cdev->private->flags.doverify = 1;
765                 return;
766         }
767         sch = to_subchannel(cdev->dev.parent);
768         /*
769          * Since we might not just be coming from an interrupt from the
770          * subchannel we have to update the schib.
771          */
772         stsch(sch->schid, &sch->schib);
773
774         if (sch->schib.scsw.actl != 0 ||
775             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
776             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
777                 /*
778                  * No final status yet or final status not yet delivered
779                  * to the device driver. Can't do path verfication now,
780                  * delay until final status was delivered.
781                  */
782                 cdev->private->flags.doverify = 1;
783                 return;
784         }
785         /* Device is idle, we can do the path verification. */
786         cdev->private->state = DEV_STATE_VERIFY;
787         ccw_device_verify_start(cdev);
788 }
789
790 /*
791  * Got an interrupt for a normal io (state online).
792  */
793 static void
794 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
795 {
796         struct irb *irb;
797
798         irb = (struct irb *) __LC_IRB;
799         /* Check for unsolicited interrupt. */
800         if ((irb->scsw.stctl ==
801                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
802             && (!irb->scsw.cc)) {
803                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
804                     !irb->esw.esw0.erw.cons) {
805                         /* Unit check but no sense data. Need basic sense. */
806                         if (ccw_device_do_sense(cdev, irb) != 0)
807                                 goto call_handler_unsol;
808                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
809                         cdev->private->state = DEV_STATE_W4SENSE;
810                         cdev->private->intparm = 0;
811                         return;
812                 }
813 call_handler_unsol:
814                 if (cdev->handler)
815                         cdev->handler (cdev, 0, irb);
816                 return;
817         }
818         /* Accumulate status and find out if a basic sense is needed. */
819         ccw_device_accumulate_irb(cdev, irb);
820         if (cdev->private->flags.dosense) {
821                 if (ccw_device_do_sense(cdev, irb) == 0) {
822                         cdev->private->state = DEV_STATE_W4SENSE;
823                 }
824                 return;
825         }
826         /* Call the handler. */
827         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
828                 /* Start delayed path verification. */
829                 ccw_device_online_verify(cdev, 0);
830 }
831
832 /*
833  * Got an timeout in online state.
834  */
835 static void
836 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
837 {
838         int ret;
839
840         ccw_device_set_timeout(cdev, 0);
841         ret = ccw_device_cancel_halt_clear(cdev);
842         if (ret == -EBUSY) {
843                 ccw_device_set_timeout(cdev, 3*HZ);
844                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
845                 return;
846         }
847         if (ret == -ENODEV) {
848                 struct subchannel *sch;
849
850                 sch = to_subchannel(cdev->dev.parent);
851                 if (!sch->lpm) {
852                         PREPARE_WORK(&cdev->private->kick_work,
853                                      ccw_device_nopath_notify, (void *)cdev);
854                         queue_work(ccw_device_notify_work,
855                                    &cdev->private->kick_work);
856                 } else
857                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
858         } else if (cdev->handler)
859                 cdev->handler(cdev, cdev->private->intparm,
860                               ERR_PTR(-ETIMEDOUT));
861 }
862
863 /*
864  * Got an interrupt for a basic sense.
865  */
866 void
867 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
868 {
869         struct irb *irb;
870
871         irb = (struct irb *) __LC_IRB;
872         /* Check for unsolicited interrupt. */
873         if (irb->scsw.stctl ==
874                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
875                 if (irb->scsw.cc == 1)
876                         /* Basic sense hasn't started. Try again. */
877                         ccw_device_do_sense(cdev, irb);
878                 else {
879                         printk("Huh? %s(%s): unsolicited interrupt...\n",
880                                __FUNCTION__, cdev->dev.bus_id);
881                         if (cdev->handler)
882                                 cdev->handler (cdev, 0, irb);
883                 }
884                 return;
885         }
886         /*
887          * Check if a halt or clear has been issued in the meanwhile. If yes,
888          * only deliver the halt/clear interrupt to the device driver as if it
889          * had killed the original request.
890          */
891         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
892                 cdev->private->flags.dosense = 0;
893                 memset(&cdev->private->irb, 0, sizeof(struct irb));
894                 ccw_device_accumulate_irb(cdev, irb);
895                 goto call_handler;
896         }
897         /* Add basic sense info to irb. */
898         ccw_device_accumulate_basic_sense(cdev, irb);
899         if (cdev->private->flags.dosense) {
900                 /* Another basic sense is needed. */
901                 ccw_device_do_sense(cdev, irb);
902                 return;
903         }
904 call_handler:
905         cdev->private->state = DEV_STATE_ONLINE;
906         /* Call the handler. */
907         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
908                 /* Start delayed path verification. */
909                 ccw_device_online_verify(cdev, 0);
910 }
911
912 static void
913 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
914 {
915         struct irb *irb;
916
917         irb = (struct irb *) __LC_IRB;
918         /* Accumulate status. We don't do basic sense. */
919         ccw_device_accumulate_irb(cdev, irb);
920         /* Remember to clear irb to avoid residuals. */
921         memset(&cdev->private->irb, 0, sizeof(struct irb));
922         /* Try to start delayed device verification. */
923         ccw_device_online_verify(cdev, 0);
924         /* Note: Don't call handler for cio initiated clear! */
925 }
926
927 static void
928 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
929 {
930         struct subchannel *sch;
931
932         sch = to_subchannel(cdev->dev.parent);
933         ccw_device_set_timeout(cdev, 0);
934         /* OK, i/o is dead now. Call interrupt handler. */
935         cdev->private->state = DEV_STATE_ONLINE;
936         if (cdev->handler)
937                 cdev->handler(cdev, cdev->private->intparm,
938                               ERR_PTR(-ETIMEDOUT));
939         if (!sch->lpm) {
940                 PREPARE_WORK(&cdev->private->kick_work,
941                              ccw_device_nopath_notify, (void *)cdev);
942                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
943         } else if (cdev->private->flags.doverify)
944                 /* Start delayed path verification. */
945                 ccw_device_online_verify(cdev, 0);
946 }
947
948 static void
949 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
950 {
951         int ret;
952
953         ret = ccw_device_cancel_halt_clear(cdev);
954         if (ret == -EBUSY) {
955                 ccw_device_set_timeout(cdev, 3*HZ);
956                 return;
957         }
958         if (ret == -ENODEV) {
959                 struct subchannel *sch;
960
961                 sch = to_subchannel(cdev->dev.parent);
962                 if (!sch->lpm) {
963                         PREPARE_WORK(&cdev->private->kick_work,
964                                      ccw_device_nopath_notify, (void *)cdev);
965                         queue_work(ccw_device_notify_work,
966                                    &cdev->private->kick_work);
967                 } else
968                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
969                 return;
970         }
971         //FIXME: Can we get here?
972         cdev->private->state = DEV_STATE_ONLINE;
973         if (cdev->handler)
974                 cdev->handler(cdev, cdev->private->intparm,
975                               ERR_PTR(-ETIMEDOUT));
976 }
977
978 static void
979 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
980 {
981         struct irb *irb;
982         struct subchannel *sch;
983
984         irb = (struct irb *) __LC_IRB;
985         /*
986          * Accumulate status and find out if a basic sense is needed.
987          * This is fine since we have already adapted the lpm.
988          */
989         ccw_device_accumulate_irb(cdev, irb);
990         if (cdev->private->flags.dosense) {
991                 if (ccw_device_do_sense(cdev, irb) == 0) {
992                         cdev->private->state = DEV_STATE_W4SENSE;
993                 }
994                 return;
995         }
996
997         /* Iff device is idle, reset timeout. */
998         sch = to_subchannel(cdev->dev.parent);
999         if (!stsch(sch->schid, &sch->schib))
1000                 if (sch->schib.scsw.actl == 0)
1001                         ccw_device_set_timeout(cdev, 0);
1002         /* Call the handler. */
1003         ccw_device_call_handler(cdev);
1004         if (!sch->lpm) {
1005                 PREPARE_WORK(&cdev->private->kick_work,
1006                              ccw_device_nopath_notify, (void *)cdev);
1007                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1008         } else if (cdev->private->flags.doverify)
1009                 ccw_device_online_verify(cdev, 0);
1010 }
1011
1012 static void
1013 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1014 {
1015         int ret;
1016         struct subchannel *sch;
1017
1018         sch = to_subchannel(cdev->dev.parent);
1019         ccw_device_set_timeout(cdev, 0);
1020         ret = ccw_device_cancel_halt_clear(cdev);
1021         if (ret == -EBUSY) {
1022                 ccw_device_set_timeout(cdev, 3*HZ);
1023                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1024                 return;
1025         }
1026         if (ret == -ENODEV) {
1027                 if (!sch->lpm) {
1028                         PREPARE_WORK(&cdev->private->kick_work,
1029                                      ccw_device_nopath_notify, (void *)cdev);
1030                         queue_work(ccw_device_notify_work,
1031                                    &cdev->private->kick_work);
1032                 } else
1033                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1034                 return;
1035         }
1036         if (cdev->handler)
1037                 cdev->handler(cdev, cdev->private->intparm,
1038                               ERR_PTR(-ETIMEDOUT));
1039         if (!sch->lpm) {
1040                 PREPARE_WORK(&cdev->private->kick_work,
1041                              ccw_device_nopath_notify, (void *)cdev);
1042                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1043         } else if (cdev->private->flags.doverify)
1044                 /* Start delayed path verification. */
1045                 ccw_device_online_verify(cdev, 0);
1046 }
1047
1048 static void
1049 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1050 {
1051         /* When the I/O has terminated, we have to start verification. */
1052         cdev->private->flags.doverify = 1;
1053 }
1054
1055 static void
1056 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1057 {
1058         struct irb *irb;
1059
1060         switch (dev_event) {
1061         case DEV_EVENT_INTERRUPT:
1062                 irb = (struct irb *) __LC_IRB;
1063                 /* Check for unsolicited interrupt. */
1064                 if ((irb->scsw.stctl ==
1065                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1066                     (!irb->scsw.cc))
1067                         /* FIXME: we should restart stlck here, but this
1068                          * is extremely unlikely ... */
1069                         goto out_wakeup;
1070
1071                 ccw_device_accumulate_irb(cdev, irb);
1072                 /* We don't care about basic sense etc. */
1073                 break;
1074         default: /* timeout */
1075                 break;
1076         }
1077 out_wakeup:
1078         wake_up(&cdev->private->wait_q);
1079 }
1080
1081 static void
1082 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1083 {
1084         struct subchannel *sch;
1085
1086         sch = to_subchannel(cdev->dev.parent);
1087         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1088                 /* Couldn't enable the subchannel for i/o. Sick device. */
1089                 return;
1090
1091         /* After 60s the device recognition is considered to have failed. */
1092         ccw_device_set_timeout(cdev, 60*HZ);
1093
1094         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1095         ccw_device_sense_id_start(cdev);
1096 }
1097
1098 void
1099 device_trigger_reprobe(struct subchannel *sch)
1100 {
1101         struct ccw_device *cdev;
1102
1103         if (!sch->dev.driver_data)
1104                 return;
1105         cdev = sch->dev.driver_data;
1106         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1107                 return;
1108
1109         /* Update some values. */
1110         if (stsch(sch->schid, &sch->schib))
1111                 return;
1112
1113         /*
1114          * The pim, pam, pom values may not be accurate, but they are the best
1115          * we have before performing device selection :/
1116          */
1117         sch->lpm = sch->schib.pmcw.pim &
1118                 sch->schib.pmcw.pam &
1119                 sch->schib.pmcw.pom &
1120                 sch->opm;
1121         /* Re-set some bits in the pmcw that were lost. */
1122         sch->schib.pmcw.isc = 3;
1123         sch->schib.pmcw.csense = 1;
1124         sch->schib.pmcw.ena = 0;
1125         if ((sch->lpm & (sch->lpm - 1)) != 0)
1126                 sch->schib.pmcw.mp = 1;
1127         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1128         /* We should also udate ssd info, but this has to wait. */
1129         ccw_device_start_id(cdev, 0);
1130 }
1131
1132 static void
1133 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1134 {
1135         struct subchannel *sch;
1136
1137         sch = to_subchannel(cdev->dev.parent);
1138         /*
1139          * An interrupt in state offline means a previous disable was not
1140          * successful. Try again.
1141          */
1142         cio_disable_subchannel(sch);
1143 }
1144
1145 static void
1146 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1147 {
1148         retry_set_schib(cdev);
1149         cdev->private->state = DEV_STATE_ONLINE;
1150         dev_fsm_event(cdev, dev_event);
1151 }
1152
1153 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1154                                        enum dev_event dev_event)
1155 {
1156         cmf_retry_copy_block(cdev);
1157         cdev->private->state = DEV_STATE_ONLINE;
1158         dev_fsm_event(cdev, dev_event);
1159 }
1160
1161 static void
1162 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1163 {
1164         ccw_device_set_timeout(cdev, 0);
1165         if (dev_event == DEV_EVENT_NOTOPER)
1166                 cdev->private->state = DEV_STATE_NOT_OPER;
1167         else
1168                 cdev->private->state = DEV_STATE_OFFLINE;
1169         wake_up(&cdev->private->wait_q);
1170 }
1171
1172 static void
1173 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1174 {
1175         int ret;
1176
1177         ret = ccw_device_cancel_halt_clear(cdev);
1178         switch (ret) {
1179         case 0:
1180                 cdev->private->state = DEV_STATE_OFFLINE;
1181                 wake_up(&cdev->private->wait_q);
1182                 break;
1183         case -ENODEV:
1184                 cdev->private->state = DEV_STATE_NOT_OPER;
1185                 wake_up(&cdev->private->wait_q);
1186                 break;
1187         default:
1188                 ccw_device_set_timeout(cdev, HZ/10);
1189         }
1190 }
1191
1192 /*
1193  * No operation action. This is used e.g. to ignore a timeout event in
1194  * state offline.
1195  */
1196 static void
1197 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1198 {
1199 }
1200
1201 /*
1202  * Bug operation action. 
1203  */
1204 static void
1205 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1206 {
1207         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1208                cdev->private->state, dev_event);
1209         BUG();
1210 }
1211
1212 /*
1213  * device statemachine
1214  */
1215 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1216         [DEV_STATE_NOT_OPER] = {
1217                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1218                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1219                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1220                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1221         },
1222         [DEV_STATE_SENSE_PGID] = {
1223                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1224                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1225                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1226                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1227         },
1228         [DEV_STATE_SENSE_ID] = {
1229                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1230                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1231                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1232                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1233         },
1234         [DEV_STATE_OFFLINE] = {
1235                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1236                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1237                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1238                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1239         },
1240         [DEV_STATE_VERIFY] = {
1241                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1242                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1243                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1244                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1245         },
1246         [DEV_STATE_ONLINE] = {
1247                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1248                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1249                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1250                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1251         },
1252         [DEV_STATE_W4SENSE] = {
1253                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1254                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1255                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1256                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1257         },
1258         [DEV_STATE_DISBAND_PGID] = {
1259                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1260                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1261                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1262                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1263         },
1264         [DEV_STATE_BOXED] = {
1265                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1266                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1267                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1268                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1269         },
1270         /* states to wait for i/o completion before doing something */
1271         [DEV_STATE_CLEAR_VERIFY] = {
1272                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1273                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1274                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1275                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1276         },
1277         [DEV_STATE_TIMEOUT_KILL] = {
1278                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1279                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1280                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1281                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1282         },
1283         [DEV_STATE_WAIT4IO] = {
1284                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1285                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1286                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1287                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1288         },
1289         [DEV_STATE_QUIESCE] = {
1290                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1291                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1292                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1293                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1294         },
1295         /* special states for devices gone not operational */
1296         [DEV_STATE_DISCONNECTED] = {
1297                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1298                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1299                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1300                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1301         },
1302         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1303                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1304                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1305                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1306                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1307         },
1308         [DEV_STATE_CMFCHANGE] = {
1309                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1310                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1311                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1312                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1313         },
1314         [DEV_STATE_CMFUPDATE] = {
1315                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1316                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1317                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1318                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1319         },
1320 };
1321
1322 /*
1323  * io_subchannel_irq is called for "real" interrupts or for status
1324  * pending conditions on msch.
1325  */
1326 void
1327 io_subchannel_irq (struct device *pdev)
1328 {
1329         struct ccw_device *cdev;
1330
1331         cdev = to_subchannel(pdev)->dev.driver_data;
1332
1333         CIO_TRACE_EVENT (3, "IRQ");
1334         CIO_TRACE_EVENT (3, pdev->bus_id);
1335         if (cdev)
1336                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1337 }
1338
1339 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);