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