Merge git://git.infradead.org/mtd-2.6
[linux-2.6.git] / 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.cu_type   = cdev->private->senseid.cu_type;
271                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
272                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
273                 cdev->id.dev_model = cdev->private->senseid.dev_model;
274                 if (notify) {
275                         cdev->private->state = DEV_STATE_OFFLINE;
276                         if (same_dev) {
277                                 /* Get device online again. */
278                                 ccw_device_online(cdev);
279                                 wake_up(&cdev->private->wait_q);
280                         }
281                         return;
282                 }
283                 /* Issue device info message. */
284                 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
285                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
286                           "%04X/%02X\n",
287                           cdev->private->ssid, cdev->private->devno,
288                           cdev->id.cu_type, cdev->id.cu_model,
289                           cdev->id.dev_type, cdev->id.dev_model);
290                 break;
291         case DEV_STATE_BOXED:
292                 CIO_DEBUG(KERN_WARNING, 2,
293                           "SenseID : boxed device %04x on subchannel "
294                           "0.%x.%04x\n", cdev->private->devno,
295                           sch->schid.ssid, sch->schid.sch_no);
296                 break;
297         }
298         cdev->private->state = state;
299         io_subchannel_recog_done(cdev);
300         if (state != DEV_STATE_NOT_OPER)
301                 wake_up(&cdev->private->wait_q);
302 }
303
304 /*
305  * Function called from device_id.c after sense id has completed.
306  */
307 void
308 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
309 {
310         switch (err) {
311         case 0:
312                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
313                 break;
314         case -ETIME:            /* Sense id stopped by timeout. */
315                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
316                 break;
317         default:
318                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
319                 break;
320         }
321 }
322
323 static void
324 ccw_device_oper_notify(void *data)
325 {
326         struct ccw_device *cdev;
327         struct subchannel *sch;
328         int ret;
329
330         cdev = (struct ccw_device *)data;
331         sch = to_subchannel(cdev->dev.parent);
332         ret = (sch->driver && sch->driver->notify) ?
333                 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
334         if (!ret)
335                 /* Driver doesn't want device back. */
336                 ccw_device_do_unreg_rereg((void *)cdev);
337         else {
338                 /* Reenable channel measurements, if needed. */
339                 cmf_reenable(cdev);
340                 wake_up(&cdev->private->wait_q);
341         }
342 }
343
344 /*
345  * Finished with online/offline processing.
346  */
347 static void
348 ccw_device_done(struct ccw_device *cdev, int state)
349 {
350         struct subchannel *sch;
351
352         sch = to_subchannel(cdev->dev.parent);
353
354         if (state != DEV_STATE_ONLINE)
355                 cio_disable_subchannel(sch);
356
357         /* Reset device status. */
358         memset(&cdev->private->irb, 0, sizeof(struct irb));
359
360         cdev->private->state = state;
361
362
363         if (state == DEV_STATE_BOXED)
364                 CIO_DEBUG(KERN_WARNING, 2,
365                           "Boxed device %04x on subchannel %04x\n",
366                           cdev->private->devno, sch->schid.sch_no);
367
368         if (cdev->private->flags.donotify) {
369                 cdev->private->flags.donotify = 0;
370                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify,
371                              (void *)cdev);
372                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
373         }
374         wake_up(&cdev->private->wait_q);
375
376         if (css_init_done && state != DEV_STATE_ONLINE)
377                 put_device (&cdev->dev);
378 }
379
380 static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
381 {
382         char *c1;
383         char *c2;
384
385         c1 = (char *)p1;
386         c2 = (char *)p2;
387
388         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
389 }
390
391 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
392 {
393         int i;
394         int last;
395
396         last = 0;
397         for (i = 0; i < 8; i++) {
398                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
399                         /* No PGID yet */
400                         continue;
401                 if (cdev->private->pgid[last].inf.ps.state1 ==
402                     SNID_STATE1_RESET) {
403                         /* First non-zero PGID */
404                         last = i;
405                         continue;
406                 }
407                 if (cmp_pgid(&cdev->private->pgid[i],
408                              &cdev->private->pgid[last]) == 0)
409                         /* Non-conflicting PGIDs */
410                         continue;
411
412                 /* PGID mismatch, can't pathgroup. */
413                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
414                               "0.%x.%04x, can't pathgroup\n",
415                               cdev->private->ssid, cdev->private->devno);
416                 cdev->private->options.pgroup = 0;
417                 return;
418         }
419         if (cdev->private->pgid[last].inf.ps.state1 ==
420             SNID_STATE1_RESET)
421                 /* No previous pgid found */
422                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
423                        sizeof(struct pgid));
424         else
425                 /* Use existing pgid */
426                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
427                        sizeof(struct pgid));
428 }
429
430 /*
431  * Function called from device_pgid.c after sense path ground has completed.
432  */
433 void
434 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
435 {
436         struct subchannel *sch;
437
438         sch = to_subchannel(cdev->dev.parent);
439         switch (err) {
440         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
441                 cdev->private->options.pgroup = 0;
442                 break;
443         case 0: /* success */
444         case -EACCES: /* partial success, some paths not operational */
445                 /* Check if all pgids are equal or 0. */
446                 __ccw_device_get_common_pgid(cdev);
447                 break;
448         case -ETIME:            /* Sense path group id stopped by timeout. */
449         case -EUSERS:           /* device is reserved for someone else. */
450                 ccw_device_done(cdev, DEV_STATE_BOXED);
451                 return;
452         default:
453                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
454                 return;
455         }
456         /* Start Path Group verification. */
457         sch->vpm = 0;   /* Start with no path groups set. */
458         cdev->private->state = DEV_STATE_VERIFY;
459         ccw_device_verify_start(cdev);
460 }
461
462 /*
463  * Start device recognition.
464  */
465 int
466 ccw_device_recognition(struct ccw_device *cdev)
467 {
468         struct subchannel *sch;
469         int ret;
470
471         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
472             (cdev->private->state != DEV_STATE_BOXED))
473                 return -EINVAL;
474         sch = to_subchannel(cdev->dev.parent);
475         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
476         if (ret != 0)
477                 /* Couldn't enable the subchannel for i/o. Sick device. */
478                 return ret;
479
480         /* After 60s the device recognition is considered to have failed. */
481         ccw_device_set_timeout(cdev, 60*HZ);
482
483         /*
484          * We used to start here with a sense pgid to find out whether a device
485          * is locked by someone else. Unfortunately, the sense pgid command
486          * code has other meanings on devices predating the path grouping
487          * algorithm, so we start with sense id and box the device after an
488          * timeout (or if sense pgid during path verification detects the device
489          * is locked, as may happen on newer devices).
490          */
491         cdev->private->flags.recog_done = 0;
492         cdev->private->state = DEV_STATE_SENSE_ID;
493         ccw_device_sense_id_start(cdev);
494         return 0;
495 }
496
497 /*
498  * Handle timeout in device recognition.
499  */
500 static void
501 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
502 {
503         int ret;
504
505         ret = ccw_device_cancel_halt_clear(cdev);
506         switch (ret) {
507         case 0:
508                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
509                 break;
510         case -ENODEV:
511                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
512                 break;
513         default:
514                 ccw_device_set_timeout(cdev, 3*HZ);
515         }
516 }
517
518
519 static void
520 ccw_device_nopath_notify(void *data)
521 {
522         struct ccw_device *cdev;
523         struct subchannel *sch;
524         int ret;
525
526         cdev = (struct ccw_device *)data;
527         sch = to_subchannel(cdev->dev.parent);
528         /* Extra sanity. */
529         if (sch->lpm)
530                 return;
531         ret = (sch->driver && sch->driver->notify) ?
532                 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
533         if (!ret) {
534                 if (get_device(&sch->dev)) {
535                         /* Driver doesn't want to keep device. */
536                         cio_disable_subchannel(sch);
537                         if (get_device(&cdev->dev)) {
538                                 PREPARE_WORK(&cdev->private->kick_work,
539                                              ccw_device_call_sch_unregister,
540                                              (void *)cdev);
541                                 queue_work(ccw_device_work,
542                                            &cdev->private->kick_work);
543                         } else
544                                 put_device(&sch->dev);
545                 }
546         } else {
547                 cio_disable_subchannel(sch);
548                 ccw_device_set_timeout(cdev, 0);
549                 cdev->private->flags.fake_irb = 0;
550                 cdev->private->state = DEV_STATE_DISCONNECTED;
551                 wake_up(&cdev->private->wait_q);
552         }
553 }
554
555 void
556 ccw_device_verify_done(struct ccw_device *cdev, int err)
557 {
558         cdev->private->flags.doverify = 0;
559         switch (err) {
560         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
561                 cdev->private->options.pgroup = 0;
562         case 0:
563                 ccw_device_done(cdev, DEV_STATE_ONLINE);
564                 /* Deliver fake irb to device driver, if needed. */
565                 if (cdev->private->flags.fake_irb) {
566                         memset(&cdev->private->irb, 0, sizeof(struct irb));
567                         cdev->private->irb.scsw.cc = 1;
568                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
569                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
570                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
571                         cdev->private->flags.fake_irb = 0;
572                         if (cdev->handler)
573                                 cdev->handler(cdev, cdev->private->intparm,
574                                               &cdev->private->irb);
575                         memset(&cdev->private->irb, 0, sizeof(struct irb));
576                 }
577                 break;
578         case -ETIME:
579                 ccw_device_done(cdev, DEV_STATE_BOXED);
580                 break;
581         default:
582                 PREPARE_WORK(&cdev->private->kick_work,
583                              ccw_device_nopath_notify, (void *)cdev);
584                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
585                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
586                 break;
587         }
588 }
589
590 /*
591  * Get device online.
592  */
593 int
594 ccw_device_online(struct ccw_device *cdev)
595 {
596         struct subchannel *sch;
597         int ret;
598
599         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
600             (cdev->private->state != DEV_STATE_BOXED))
601                 return -EINVAL;
602         sch = to_subchannel(cdev->dev.parent);
603         if (css_init_done && !get_device(&cdev->dev))
604                 return -ENODEV;
605         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
606         if (ret != 0) {
607                 /* Couldn't enable the subchannel for i/o. Sick device. */
608                 if (ret == -ENODEV)
609                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
610                 return ret;
611         }
612         /* Do we want to do path grouping? */
613         if (!cdev->private->options.pgroup) {
614                 /* Start initial path verification. */
615                 cdev->private->state = DEV_STATE_VERIFY;
616                 ccw_device_verify_start(cdev);
617                 return 0;
618         }
619         /* Do a SensePGID first. */
620         cdev->private->state = DEV_STATE_SENSE_PGID;
621         ccw_device_sense_pgid_start(cdev);
622         return 0;
623 }
624
625 void
626 ccw_device_disband_done(struct ccw_device *cdev, int err)
627 {
628         switch (err) {
629         case 0:
630                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
631                 break;
632         case -ETIME:
633                 ccw_device_done(cdev, DEV_STATE_BOXED);
634                 break;
635         default:
636                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
637                 break;
638         }
639 }
640
641 /*
642  * Shutdown device.
643  */
644 int
645 ccw_device_offline(struct ccw_device *cdev)
646 {
647         struct subchannel *sch;
648
649         sch = to_subchannel(cdev->dev.parent);
650         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
651                 return -ENODEV;
652         if (cdev->private->state != DEV_STATE_ONLINE) {
653                 if (sch->schib.scsw.actl != 0)
654                         return -EBUSY;
655                 return -EINVAL;
656         }
657         if (sch->schib.scsw.actl != 0)
658                 return -EBUSY;
659         /* Are we doing path grouping? */
660         if (!cdev->private->options.pgroup) {
661                 /* No, set state offline immediately. */
662                 sch->vpm = 0;
663                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
664                 return 0;
665         }
666         /* Start Set Path Group commands. */
667         cdev->private->state = DEV_STATE_DISBAND_PGID;
668         ccw_device_disband_start(cdev);
669         return 0;
670 }
671
672 /*
673  * Handle timeout in device online/offline process.
674  */
675 static void
676 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
677 {
678         int ret;
679
680         ret = ccw_device_cancel_halt_clear(cdev);
681         switch (ret) {
682         case 0:
683                 ccw_device_done(cdev, DEV_STATE_BOXED);
684                 break;
685         case -ENODEV:
686                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
687                 break;
688         default:
689                 ccw_device_set_timeout(cdev, 3*HZ);
690         }
691 }
692
693 /*
694  * Handle not oper event in device recognition.
695  */
696 static void
697 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
698 {
699         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
700 }
701
702 /*
703  * Handle not operational event while offline.
704  */
705 static void
706 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
707 {
708         struct subchannel *sch;
709
710         cdev->private->state = DEV_STATE_NOT_OPER;
711         sch = to_subchannel(cdev->dev.parent);
712         if (get_device(&cdev->dev)) {
713                 PREPARE_WORK(&cdev->private->kick_work,
714                              ccw_device_call_sch_unregister, (void *)cdev);
715                 queue_work(ccw_device_work, &cdev->private->kick_work);
716         }
717         wake_up(&cdev->private->wait_q);
718 }
719
720 /*
721  * Handle not operational event while online.
722  */
723 static void
724 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
725 {
726         struct subchannel *sch;
727
728         sch = to_subchannel(cdev->dev.parent);
729         if (sch->driver->notify &&
730             sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
731                         ccw_device_set_timeout(cdev, 0);
732                         cdev->private->flags.fake_irb = 0;
733                         cdev->private->state = DEV_STATE_DISCONNECTED;
734                         wake_up(&cdev->private->wait_q);
735                         return;
736         }
737         cdev->private->state = DEV_STATE_NOT_OPER;
738         cio_disable_subchannel(sch);
739         if (sch->schib.scsw.actl != 0) {
740                 // FIXME: not-oper indication to device driver ?
741                 ccw_device_call_handler(cdev);
742         }
743         if (get_device(&cdev->dev)) {
744                 PREPARE_WORK(&cdev->private->kick_work,
745                              ccw_device_call_sch_unregister, (void *)cdev);
746                 queue_work(ccw_device_work, &cdev->private->kick_work);
747         }
748         wake_up(&cdev->private->wait_q);
749 }
750
751 /*
752  * Handle path verification event.
753  */
754 static void
755 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
756 {
757         struct subchannel *sch;
758
759         if (cdev->private->state == DEV_STATE_W4SENSE) {
760                 cdev->private->flags.doverify = 1;
761                 return;
762         }
763         sch = to_subchannel(cdev->dev.parent);
764         /*
765          * Since we might not just be coming from an interrupt from the
766          * subchannel we have to update the schib.
767          */
768         stsch(sch->schid, &sch->schib);
769
770         if (sch->schib.scsw.actl != 0 ||
771             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
772             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
773                 /*
774                  * No final status yet or final status not yet delivered
775                  * to the device driver. Can't do path verfication now,
776                  * delay until final status was delivered.
777                  */
778                 cdev->private->flags.doverify = 1;
779                 return;
780         }
781         /* Device is idle, we can do the path verification. */
782         cdev->private->state = DEV_STATE_VERIFY;
783         ccw_device_verify_start(cdev);
784 }
785
786 /*
787  * Got an interrupt for a normal io (state online).
788  */
789 static void
790 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
791 {
792         struct irb *irb;
793
794         irb = (struct irb *) __LC_IRB;
795         /* Check for unsolicited interrupt. */
796         if ((irb->scsw.stctl ==
797                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
798             && (!irb->scsw.cc)) {
799                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
800                     !irb->esw.esw0.erw.cons) {
801                         /* Unit check but no sense data. Need basic sense. */
802                         if (ccw_device_do_sense(cdev, irb) != 0)
803                                 goto call_handler_unsol;
804                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
805                         cdev->private->state = DEV_STATE_W4SENSE;
806                         cdev->private->intparm = 0;
807                         return;
808                 }
809 call_handler_unsol:
810                 if (cdev->handler)
811                         cdev->handler (cdev, 0, irb);
812                 return;
813         }
814         /* Accumulate status and find out if a basic sense is needed. */
815         ccw_device_accumulate_irb(cdev, irb);
816         if (cdev->private->flags.dosense) {
817                 if (ccw_device_do_sense(cdev, irb) == 0) {
818                         cdev->private->state = DEV_STATE_W4SENSE;
819                 }
820                 return;
821         }
822         /* Call the handler. */
823         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
824                 /* Start delayed path verification. */
825                 ccw_device_online_verify(cdev, 0);
826 }
827
828 /*
829  * Got an timeout in online state.
830  */
831 static void
832 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
833 {
834         int ret;
835
836         ccw_device_set_timeout(cdev, 0);
837         ret = ccw_device_cancel_halt_clear(cdev);
838         if (ret == -EBUSY) {
839                 ccw_device_set_timeout(cdev, 3*HZ);
840                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
841                 return;
842         }
843         if (ret == -ENODEV) {
844                 struct subchannel *sch;
845
846                 sch = to_subchannel(cdev->dev.parent);
847                 if (!sch->lpm) {
848                         PREPARE_WORK(&cdev->private->kick_work,
849                                      ccw_device_nopath_notify, (void *)cdev);
850                         queue_work(ccw_device_notify_work,
851                                    &cdev->private->kick_work);
852                 } else
853                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
854         } else if (cdev->handler)
855                 cdev->handler(cdev, cdev->private->intparm,
856                               ERR_PTR(-ETIMEDOUT));
857 }
858
859 /*
860  * Got an interrupt for a basic sense.
861  */
862 void
863 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
864 {
865         struct irb *irb;
866
867         irb = (struct irb *) __LC_IRB;
868         /* Check for unsolicited interrupt. */
869         if (irb->scsw.stctl ==
870                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
871                 if (irb->scsw.cc == 1)
872                         /* Basic sense hasn't started. Try again. */
873                         ccw_device_do_sense(cdev, irb);
874                 else {
875                         printk("Huh? %s(%s): unsolicited interrupt...\n",
876                                __FUNCTION__, cdev->dev.bus_id);
877                         if (cdev->handler)
878                                 cdev->handler (cdev, 0, irb);
879                 }
880                 return;
881         }
882         /*
883          * Check if a halt or clear has been issued in the meanwhile. If yes,
884          * only deliver the halt/clear interrupt to the device driver as if it
885          * had killed the original request.
886          */
887         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
888                 cdev->private->flags.dosense = 0;
889                 memset(&cdev->private->irb, 0, sizeof(struct irb));
890                 ccw_device_accumulate_irb(cdev, irb);
891                 goto call_handler;
892         }
893         /* Add basic sense info to irb. */
894         ccw_device_accumulate_basic_sense(cdev, irb);
895         if (cdev->private->flags.dosense) {
896                 /* Another basic sense is needed. */
897                 ccw_device_do_sense(cdev, irb);
898                 return;
899         }
900 call_handler:
901         cdev->private->state = DEV_STATE_ONLINE;
902         /* Call the handler. */
903         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
904                 /* Start delayed path verification. */
905                 ccw_device_online_verify(cdev, 0);
906 }
907
908 static void
909 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
910 {
911         struct irb *irb;
912
913         irb = (struct irb *) __LC_IRB;
914         /* Accumulate status. We don't do basic sense. */
915         ccw_device_accumulate_irb(cdev, irb);
916         /* Remember to clear irb to avoid residuals. */
917         memset(&cdev->private->irb, 0, sizeof(struct irb));
918         /* Try to start delayed device verification. */
919         ccw_device_online_verify(cdev, 0);
920         /* Note: Don't call handler for cio initiated clear! */
921 }
922
923 static void
924 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
925 {
926         struct subchannel *sch;
927
928         sch = to_subchannel(cdev->dev.parent);
929         ccw_device_set_timeout(cdev, 0);
930         /* OK, i/o is dead now. Call interrupt handler. */
931         cdev->private->state = DEV_STATE_ONLINE;
932         if (cdev->handler)
933                 cdev->handler(cdev, cdev->private->intparm,
934                               ERR_PTR(-ETIMEDOUT));
935         if (!sch->lpm) {
936                 PREPARE_WORK(&cdev->private->kick_work,
937                              ccw_device_nopath_notify, (void *)cdev);
938                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
939         } else if (cdev->private->flags.doverify)
940                 /* Start delayed path verification. */
941                 ccw_device_online_verify(cdev, 0);
942 }
943
944 static void
945 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
946 {
947         int ret;
948
949         ret = ccw_device_cancel_halt_clear(cdev);
950         if (ret == -EBUSY) {
951                 ccw_device_set_timeout(cdev, 3*HZ);
952                 return;
953         }
954         if (ret == -ENODEV) {
955                 struct subchannel *sch;
956
957                 sch = to_subchannel(cdev->dev.parent);
958                 if (!sch->lpm) {
959                         PREPARE_WORK(&cdev->private->kick_work,
960                                      ccw_device_nopath_notify, (void *)cdev);
961                         queue_work(ccw_device_notify_work,
962                                    &cdev->private->kick_work);
963                 } else
964                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
965                 return;
966         }
967         //FIXME: Can we get here?
968         cdev->private->state = DEV_STATE_ONLINE;
969         if (cdev->handler)
970                 cdev->handler(cdev, cdev->private->intparm,
971                               ERR_PTR(-ETIMEDOUT));
972 }
973
974 static void
975 ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event)
976 {
977         struct irb *irb;
978         struct subchannel *sch;
979
980         irb = (struct irb *) __LC_IRB;
981         /*
982          * Accumulate status and find out if a basic sense is needed.
983          * This is fine since we have already adapted the lpm.
984          */
985         ccw_device_accumulate_irb(cdev, irb);
986         if (cdev->private->flags.dosense) {
987                 if (ccw_device_do_sense(cdev, irb) == 0) {
988                         cdev->private->state = DEV_STATE_W4SENSE;
989                 }
990                 return;
991         }
992
993         /* Iff device is idle, reset timeout. */
994         sch = to_subchannel(cdev->dev.parent);
995         if (!stsch(sch->schid, &sch->schib))
996                 if (sch->schib.scsw.actl == 0)
997                         ccw_device_set_timeout(cdev, 0);
998         /* Call the handler. */
999         ccw_device_call_handler(cdev);
1000         if (!sch->lpm) {
1001                 PREPARE_WORK(&cdev->private->kick_work,
1002                              ccw_device_nopath_notify, (void *)cdev);
1003                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1004         } else if (cdev->private->flags.doverify)
1005                 ccw_device_online_verify(cdev, 0);
1006 }
1007
1008 static void
1009 ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1010 {
1011         int ret;
1012         struct subchannel *sch;
1013
1014         sch = to_subchannel(cdev->dev.parent);
1015         ccw_device_set_timeout(cdev, 0);
1016         ret = ccw_device_cancel_halt_clear(cdev);
1017         if (ret == -EBUSY) {
1018                 ccw_device_set_timeout(cdev, 3*HZ);
1019                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1020                 return;
1021         }
1022         if (ret == -ENODEV) {
1023                 if (!sch->lpm) {
1024                         PREPARE_WORK(&cdev->private->kick_work,
1025                                      ccw_device_nopath_notify, (void *)cdev);
1026                         queue_work(ccw_device_notify_work,
1027                                    &cdev->private->kick_work);
1028                 } else
1029                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1030                 return;
1031         }
1032         if (cdev->handler)
1033                 cdev->handler(cdev, cdev->private->intparm,
1034                               ERR_PTR(-ETIMEDOUT));
1035         if (!sch->lpm) {
1036                 PREPARE_WORK(&cdev->private->kick_work,
1037                              ccw_device_nopath_notify, (void *)cdev);
1038                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
1039         } else if (cdev->private->flags.doverify)
1040                 /* Start delayed path verification. */
1041                 ccw_device_online_verify(cdev, 0);
1042 }
1043
1044 static void
1045 ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
1046 {
1047         /* When the I/O has terminated, we have to start verification. */
1048         cdev->private->flags.doverify = 1;
1049 }
1050
1051 static void
1052 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1053 {
1054         struct irb *irb;
1055
1056         switch (dev_event) {
1057         case DEV_EVENT_INTERRUPT:
1058                 irb = (struct irb *) __LC_IRB;
1059                 /* Check for unsolicited interrupt. */
1060                 if ((irb->scsw.stctl ==
1061                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1062                     (!irb->scsw.cc))
1063                         /* FIXME: we should restart stlck here, but this
1064                          * is extremely unlikely ... */
1065                         goto out_wakeup;
1066
1067                 ccw_device_accumulate_irb(cdev, irb);
1068                 /* We don't care about basic sense etc. */
1069                 break;
1070         default: /* timeout */
1071                 break;
1072         }
1073 out_wakeup:
1074         wake_up(&cdev->private->wait_q);
1075 }
1076
1077 static void
1078 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1079 {
1080         struct subchannel *sch;
1081
1082         sch = to_subchannel(cdev->dev.parent);
1083         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1084                 /* Couldn't enable the subchannel for i/o. Sick device. */
1085                 return;
1086
1087         /* After 60s the device recognition is considered to have failed. */
1088         ccw_device_set_timeout(cdev, 60*HZ);
1089
1090         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1091         ccw_device_sense_id_start(cdev);
1092 }
1093
1094 void
1095 device_trigger_reprobe(struct subchannel *sch)
1096 {
1097         struct ccw_device *cdev;
1098
1099         if (!sch->dev.driver_data)
1100                 return;
1101         cdev = sch->dev.driver_data;
1102         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1103                 return;
1104
1105         /* Update some values. */
1106         if (stsch(sch->schid, &sch->schib))
1107                 return;
1108
1109         /*
1110          * The pim, pam, pom values may not be accurate, but they are the best
1111          * we have before performing device selection :/
1112          */
1113         sch->lpm = sch->schib.pmcw.pim &
1114                 sch->schib.pmcw.pam &
1115                 sch->schib.pmcw.pom &
1116                 sch->opm;
1117         /* Re-set some bits in the pmcw that were lost. */
1118         sch->schib.pmcw.isc = 3;
1119         sch->schib.pmcw.csense = 1;
1120         sch->schib.pmcw.ena = 0;
1121         if ((sch->lpm & (sch->lpm - 1)) != 0)
1122                 sch->schib.pmcw.mp = 1;
1123         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1124         /* We should also udate ssd info, but this has to wait. */
1125         ccw_device_start_id(cdev, 0);
1126 }
1127
1128 static void
1129 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1130 {
1131         struct subchannel *sch;
1132
1133         sch = to_subchannel(cdev->dev.parent);
1134         /*
1135          * An interrupt in state offline means a previous disable was not
1136          * successful. Try again.
1137          */
1138         cio_disable_subchannel(sch);
1139 }
1140
1141 static void
1142 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1143 {
1144         retry_set_schib(cdev);
1145         cdev->private->state = DEV_STATE_ONLINE;
1146         dev_fsm_event(cdev, dev_event);
1147 }
1148
1149 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1150                                        enum dev_event dev_event)
1151 {
1152         cmf_retry_copy_block(cdev);
1153         cdev->private->state = DEV_STATE_ONLINE;
1154         dev_fsm_event(cdev, dev_event);
1155 }
1156
1157 static void
1158 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1159 {
1160         ccw_device_set_timeout(cdev, 0);
1161         if (dev_event == DEV_EVENT_NOTOPER)
1162                 cdev->private->state = DEV_STATE_NOT_OPER;
1163         else
1164                 cdev->private->state = DEV_STATE_OFFLINE;
1165         wake_up(&cdev->private->wait_q);
1166 }
1167
1168 static void
1169 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1170 {
1171         int ret;
1172
1173         ret = ccw_device_cancel_halt_clear(cdev);
1174         switch (ret) {
1175         case 0:
1176                 cdev->private->state = DEV_STATE_OFFLINE;
1177                 wake_up(&cdev->private->wait_q);
1178                 break;
1179         case -ENODEV:
1180                 cdev->private->state = DEV_STATE_NOT_OPER;
1181                 wake_up(&cdev->private->wait_q);
1182                 break;
1183         default:
1184                 ccw_device_set_timeout(cdev, HZ/10);
1185         }
1186 }
1187
1188 /*
1189  * No operation action. This is used e.g. to ignore a timeout event in
1190  * state offline.
1191  */
1192 static void
1193 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1194 {
1195 }
1196
1197 /*
1198  * Bug operation action. 
1199  */
1200 static void
1201 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1202 {
1203         printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1204                cdev->private->state, dev_event);
1205         BUG();
1206 }
1207
1208 /*
1209  * device statemachine
1210  */
1211 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1212         [DEV_STATE_NOT_OPER] = {
1213                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1214                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1215                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1216                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1217         },
1218         [DEV_STATE_SENSE_PGID] = {
1219                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1220                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1221                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1222                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1223         },
1224         [DEV_STATE_SENSE_ID] = {
1225                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1226                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1227                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1228                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1229         },
1230         [DEV_STATE_OFFLINE] = {
1231                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1232                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1233                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1234                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1235         },
1236         [DEV_STATE_VERIFY] = {
1237                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1238                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1239                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1240                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1241         },
1242         [DEV_STATE_ONLINE] = {
1243                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1244                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1245                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1246                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1247         },
1248         [DEV_STATE_W4SENSE] = {
1249                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1250                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1251                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1252                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1253         },
1254         [DEV_STATE_DISBAND_PGID] = {
1255                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1256                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1257                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1258                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1259         },
1260         [DEV_STATE_BOXED] = {
1261                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1262                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1263                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1264                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1265         },
1266         /* states to wait for i/o completion before doing something */
1267         [DEV_STATE_CLEAR_VERIFY] = {
1268                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1269                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1270                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1271                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1272         },
1273         [DEV_STATE_TIMEOUT_KILL] = {
1274                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1275                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1276                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1277                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1278         },
1279         [DEV_STATE_WAIT4IO] = {
1280                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1281                 [DEV_EVENT_INTERRUPT]   = ccw_device_wait4io_irq,
1282                 [DEV_EVENT_TIMEOUT]     = ccw_device_wait4io_timeout,
1283                 [DEV_EVENT_VERIFY]      = ccw_device_wait4io_verify,
1284         },
1285         [DEV_STATE_QUIESCE] = {
1286                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1287                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1288                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1289                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1290         },
1291         /* special states for devices gone not operational */
1292         [DEV_STATE_DISCONNECTED] = {
1293                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1294                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1295                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1296                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1297         },
1298         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1299                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1300                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1301                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1302                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1303         },
1304         [DEV_STATE_CMFCHANGE] = {
1305                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1306                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1307                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1308                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1309         },
1310         [DEV_STATE_CMFUPDATE] = {
1311                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1312                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1313                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1314                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1315         },
1316 };
1317
1318 /*
1319  * io_subchannel_irq is called for "real" interrupts or for status
1320  * pending conditions on msch.
1321  */
1322 void
1323 io_subchannel_irq (struct device *pdev)
1324 {
1325         struct ccw_device *cdev;
1326
1327         cdev = to_subchannel(pdev)->dev.driver_data;
1328
1329         CIO_TRACE_EVENT (3, "IRQ");
1330         CIO_TRACE_EVENT (3, pdev->bus_id);
1331         if (cdev)
1332                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1333 }
1334
1335 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);