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Commit | Line | Data |
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1da177e4 LT |
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(cohuck@de.ibm.com) | |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/config.h> | |
13 | #include <linux/init.h> | |
14 | ||
15 | #include <asm/ccwdev.h> | |
16 | #include <asm/qdio.h> | |
17 | ||
18 | #include "cio.h" | |
19 | #include "cio_debug.h" | |
20 | #include "css.h" | |
21 | #include "device.h" | |
22 | #include "chsc.h" | |
23 | #include "ioasm.h" | |
24 | #include "qdio.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->irq, &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 | return (ret == 0) ? -EBUSY : ret; | |
156 | } | |
157 | /* halt io unsuccessful. */ | |
158 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
159 | } | |
160 | /* Stage 3: clear io. */ | |
161 | if (cdev->private->iretry) { | |
162 | cdev->private->iretry--; | |
163 | ret = cio_clear (sch); | |
164 | return (ret == 0) ? -EBUSY : ret; | |
165 | } | |
166 | panic("Can't stop i/o on subchannel.\n"); | |
167 | } | |
168 | ||
169 | static int | |
170 | ccw_device_handle_oper(struct ccw_device *cdev) | |
171 | { | |
172 | struct subchannel *sch; | |
173 | ||
174 | sch = to_subchannel(cdev->dev.parent); | |
175 | cdev->private->flags.recog_done = 1; | |
176 | /* | |
177 | * Check if cu type and device type still match. If | |
178 | * not, it is certainly another device and we have to | |
179 | * de- and re-register. Also check here for non-matching devno. | |
180 | */ | |
181 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
182 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
183 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
184 | cdev->id.dev_model != cdev->private->senseid.dev_model || | |
185 | cdev->private->devno != sch->schib.pmcw.dev) { | |
186 | PREPARE_WORK(&cdev->private->kick_work, | |
187 | ccw_device_do_unreg_rereg, (void *)cdev); | |
188 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
189 | return 0; | |
190 | } | |
191 | cdev->private->flags.donotify = 1; | |
192 | return 1; | |
193 | } | |
194 | ||
195 | /* | |
196 | * The machine won't give us any notification by machine check if a chpid has | |
197 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
198 | * the channel subsystem to device selection and updating our path masks). | |
199 | */ | |
200 | static inline void | |
201 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) | |
202 | { | |
203 | int mask, i; | |
204 | ||
205 | for (i = 0; i<8; i++) { | |
206 | mask = 0x80 >> i; | |
207 | if (!(sch->lpm & mask)) | |
208 | continue; | |
209 | if (old_lpm & mask) | |
210 | continue; | |
211 | chpid_is_actually_online(sch->schib.pmcw.chpid[i]); | |
212 | } | |
213 | } | |
214 | ||
215 | /* | |
216 | * Stop device recognition. | |
217 | */ | |
218 | static void | |
219 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
220 | { | |
221 | struct subchannel *sch; | |
222 | int notify, old_lpm, same_dev; | |
223 | ||
224 | sch = to_subchannel(cdev->dev.parent); | |
225 | ||
226 | ccw_device_set_timeout(cdev, 0); | |
227 | cio_disable_subchannel(sch); | |
228 | /* | |
229 | * Now that we tried recognition, we have performed device selection | |
230 | * through ssch() and the path information is up to date. | |
231 | */ | |
232 | old_lpm = sch->lpm; | |
233 | stsch(sch->irq, &sch->schib); | |
234 | sch->lpm = sch->schib.pmcw.pim & | |
235 | sch->schib.pmcw.pam & | |
236 | sch->schib.pmcw.pom & | |
237 | sch->opm; | |
238 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) | |
239 | /* Force reprobe on all chpids. */ | |
240 | old_lpm = 0; | |
241 | if (sch->lpm != old_lpm) | |
242 | __recover_lost_chpids(sch, old_lpm); | |
243 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
244 | if (state == DEV_STATE_NOT_OPER) { | |
245 | cdev->private->flags.recog_done = 1; | |
246 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
247 | return; | |
248 | } | |
249 | /* Boxed devices don't need extra treatment. */ | |
250 | } | |
251 | notify = 0; | |
252 | same_dev = 0; /* Keep the compiler quiet... */ | |
253 | switch (state) { | |
254 | case DEV_STATE_NOT_OPER: | |
255 | CIO_DEBUG(KERN_WARNING, 2, | |
256 | "SenseID : unknown device %04x on subchannel %04x\n", | |
257 | cdev->private->devno, sch->irq); | |
258 | break; | |
259 | case DEV_STATE_OFFLINE: | |
260 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
261 | same_dev = ccw_device_handle_oper(cdev); | |
262 | notify = 1; | |
263 | } | |
264 | /* fill out sense information */ | |
265 | cdev->id = (struct ccw_device_id) { | |
266 | .cu_type = cdev->private->senseid.cu_type, | |
267 | .cu_model = cdev->private->senseid.cu_model, | |
268 | .dev_type = cdev->private->senseid.dev_type, | |
269 | .dev_model = cdev->private->senseid.dev_model, | |
270 | }; | |
271 | if (notify) { | |
272 | cdev->private->state = DEV_STATE_OFFLINE; | |
273 | if (same_dev) { | |
274 | /* Get device online again. */ | |
275 | ccw_device_online(cdev); | |
276 | wake_up(&cdev->private->wait_q); | |
277 | } | |
278 | return; | |
279 | } | |
280 | /* Issue device info message. */ | |
281 | CIO_DEBUG(KERN_INFO, 2, "SenseID : device %04x reports: " | |
282 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
283 | "%04X/%02X\n", cdev->private->devno, | |
284 | cdev->id.cu_type, cdev->id.cu_model, | |
285 | cdev->id.dev_type, cdev->id.dev_model); | |
286 | break; | |
287 | case DEV_STATE_BOXED: | |
288 | CIO_DEBUG(KERN_WARNING, 2, | |
289 | "SenseID : boxed device %04x on subchannel %04x\n", | |
290 | cdev->private->devno, sch->irq); | |
291 | break; | |
292 | } | |
293 | cdev->private->state = state; | |
294 | io_subchannel_recog_done(cdev); | |
295 | if (state != DEV_STATE_NOT_OPER) | |
296 | wake_up(&cdev->private->wait_q); | |
297 | } | |
298 | ||
299 | /* | |
300 | * Function called from device_id.c after sense id has completed. | |
301 | */ | |
302 | void | |
303 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
304 | { | |
305 | switch (err) { | |
306 | case 0: | |
307 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
308 | break; | |
309 | case -ETIME: /* Sense id stopped by timeout. */ | |
310 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
311 | break; | |
312 | default: | |
313 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
314 | break; | |
315 | } | |
316 | } | |
317 | ||
318 | static void | |
319 | ccw_device_oper_notify(void *data) | |
320 | { | |
321 | struct ccw_device *cdev; | |
322 | struct subchannel *sch; | |
323 | int ret; | |
324 | ||
325 | cdev = (struct ccw_device *)data; | |
326 | sch = to_subchannel(cdev->dev.parent); | |
327 | ret = (sch->driver && sch->driver->notify) ? | |
328 | sch->driver->notify(&sch->dev, CIO_OPER) : 0; | |
329 | if (!ret) | |
330 | /* Driver doesn't want device back. */ | |
331 | ccw_device_do_unreg_rereg((void *)cdev); | |
332 | else | |
333 | wake_up(&cdev->private->wait_q); | |
334 | } | |
335 | ||
336 | /* | |
337 | * Finished with online/offline processing. | |
338 | */ | |
339 | static void | |
340 | ccw_device_done(struct ccw_device *cdev, int state) | |
341 | { | |
342 | struct subchannel *sch; | |
343 | ||
344 | sch = to_subchannel(cdev->dev.parent); | |
345 | ||
346 | if (state != DEV_STATE_ONLINE) | |
347 | cio_disable_subchannel(sch); | |
348 | ||
349 | /* Reset device status. */ | |
350 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
351 | ||
352 | cdev->private->state = state; | |
353 | ||
354 | ||
355 | if (state == DEV_STATE_BOXED) | |
356 | CIO_DEBUG(KERN_WARNING, 2, | |
357 | "Boxed device %04x on subchannel %04x\n", | |
358 | cdev->private->devno, sch->irq); | |
359 | ||
360 | if (cdev->private->flags.donotify) { | |
361 | cdev->private->flags.donotify = 0; | |
362 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify, | |
363 | (void *)cdev); | |
364 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
365 | } | |
366 | wake_up(&cdev->private->wait_q); | |
367 | ||
368 | if (css_init_done && state != DEV_STATE_ONLINE) | |
369 | put_device (&cdev->dev); | |
370 | } | |
371 | ||
372 | /* | |
373 | * Function called from device_pgid.c after sense path ground has completed. | |
374 | */ | |
375 | void | |
376 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
377 | { | |
378 | struct subchannel *sch; | |
379 | ||
380 | sch = to_subchannel(cdev->dev.parent); | |
381 | switch (err) { | |
382 | case 0: | |
383 | /* Start Path Group verification. */ | |
384 | sch->vpm = 0; /* Start with no path groups set. */ | |
385 | cdev->private->state = DEV_STATE_VERIFY; | |
386 | ccw_device_verify_start(cdev); | |
387 | break; | |
388 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
389 | case -EUSERS: /* device is reserved for someone else. */ | |
390 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
391 | break; | |
392 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
393 | cdev->private->options.pgroup = 0; | |
394 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
395 | break; | |
396 | default: | |
397 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
398 | break; | |
399 | } | |
400 | } | |
401 | ||
402 | /* | |
403 | * Start device recognition. | |
404 | */ | |
405 | int | |
406 | ccw_device_recognition(struct ccw_device *cdev) | |
407 | { | |
408 | struct subchannel *sch; | |
409 | int ret; | |
410 | ||
411 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
412 | (cdev->private->state != DEV_STATE_BOXED)) | |
413 | return -EINVAL; | |
414 | sch = to_subchannel(cdev->dev.parent); | |
415 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
416 | if (ret != 0) | |
417 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
418 | return ret; | |
419 | ||
420 | /* After 60s the device recognition is considered to have failed. */ | |
421 | ccw_device_set_timeout(cdev, 60*HZ); | |
422 | ||
423 | /* | |
424 | * We used to start here with a sense pgid to find out whether a device | |
425 | * is locked by someone else. Unfortunately, the sense pgid command | |
426 | * code has other meanings on devices predating the path grouping | |
427 | * algorithm, so we start with sense id and box the device after an | |
428 | * timeout (or if sense pgid during path verification detects the device | |
429 | * is locked, as may happen on newer devices). | |
430 | */ | |
431 | cdev->private->flags.recog_done = 0; | |
432 | cdev->private->state = DEV_STATE_SENSE_ID; | |
433 | ccw_device_sense_id_start(cdev); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Handle timeout in device recognition. | |
439 | */ | |
440 | static void | |
441 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
442 | { | |
443 | int ret; | |
444 | ||
445 | ret = ccw_device_cancel_halt_clear(cdev); | |
446 | switch (ret) { | |
447 | case 0: | |
448 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
449 | break; | |
450 | case -ENODEV: | |
451 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
452 | break; | |
453 | default: | |
454 | ccw_device_set_timeout(cdev, 3*HZ); | |
455 | } | |
456 | } | |
457 | ||
458 | ||
459 | static void | |
460 | ccw_device_nopath_notify(void *data) | |
461 | { | |
462 | struct ccw_device *cdev; | |
463 | struct subchannel *sch; | |
464 | int ret; | |
465 | ||
466 | cdev = (struct ccw_device *)data; | |
467 | sch = to_subchannel(cdev->dev.parent); | |
468 | /* Extra sanity. */ | |
469 | if (sch->lpm) | |
470 | return; | |
471 | ret = (sch->driver && sch->driver->notify) ? | |
472 | sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0; | |
473 | if (!ret) { | |
474 | if (get_device(&sch->dev)) { | |
475 | /* Driver doesn't want to keep device. */ | |
476 | cio_disable_subchannel(sch); | |
477 | if (get_device(&cdev->dev)) { | |
478 | PREPARE_WORK(&cdev->private->kick_work, | |
479 | ccw_device_call_sch_unregister, | |
480 | (void *)cdev); | |
481 | queue_work(ccw_device_work, | |
482 | &cdev->private->kick_work); | |
483 | } else | |
484 | put_device(&sch->dev); | |
485 | } | |
486 | } else { | |
487 | cio_disable_subchannel(sch); | |
488 | ccw_device_set_timeout(cdev, 0); | |
489 | cdev->private->flags.fake_irb = 0; | |
490 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
491 | wake_up(&cdev->private->wait_q); | |
492 | } | |
493 | } | |
494 | ||
495 | void | |
496 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
497 | { | |
498 | cdev->private->flags.doverify = 0; | |
499 | switch (err) { | |
500 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
501 | cdev->private->options.pgroup = 0; | |
502 | case 0: | |
503 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
504 | /* Deliver fake irb to device driver, if needed. */ | |
505 | if (cdev->private->flags.fake_irb) { | |
506 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
507 | cdev->private->irb.scsw = (struct scsw) { | |
508 | .cc = 1, | |
509 | .fctl = SCSW_FCTL_START_FUNC, | |
510 | .actl = SCSW_ACTL_START_PEND, | |
511 | .stctl = SCSW_STCTL_STATUS_PEND, | |
512 | }; | |
513 | cdev->private->flags.fake_irb = 0; | |
514 | if (cdev->handler) | |
515 | cdev->handler(cdev, cdev->private->intparm, | |
516 | &cdev->private->irb); | |
517 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
518 | } | |
519 | break; | |
520 | case -ETIME: | |
521 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
522 | break; | |
523 | default: | |
524 | PREPARE_WORK(&cdev->private->kick_work, | |
525 | ccw_device_nopath_notify, (void *)cdev); | |
526 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
527 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
528 | break; | |
529 | } | |
530 | } | |
531 | ||
532 | /* | |
533 | * Get device online. | |
534 | */ | |
535 | int | |
536 | ccw_device_online(struct ccw_device *cdev) | |
537 | { | |
538 | struct subchannel *sch; | |
539 | int ret; | |
540 | ||
541 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
542 | (cdev->private->state != DEV_STATE_BOXED)) | |
543 | return -EINVAL; | |
544 | sch = to_subchannel(cdev->dev.parent); | |
545 | if (css_init_done && !get_device(&cdev->dev)) | |
546 | return -ENODEV; | |
547 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
548 | if (ret != 0) { | |
549 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
550 | if (ret == -ENODEV) | |
551 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
552 | return ret; | |
553 | } | |
554 | /* Do we want to do path grouping? */ | |
555 | if (!cdev->private->options.pgroup) { | |
556 | /* No, set state online immediately. */ | |
557 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
558 | return 0; | |
559 | } | |
560 | /* Do a SensePGID first. */ | |
561 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
562 | ccw_device_sense_pgid_start(cdev); | |
563 | return 0; | |
564 | } | |
565 | ||
566 | void | |
567 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
568 | { | |
569 | switch (err) { | |
570 | case 0: | |
571 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
572 | break; | |
573 | case -ETIME: | |
574 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
575 | break; | |
576 | default: | |
577 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
582 | /* | |
583 | * Shutdown device. | |
584 | */ | |
585 | int | |
586 | ccw_device_offline(struct ccw_device *cdev) | |
587 | { | |
588 | struct subchannel *sch; | |
589 | ||
590 | sch = to_subchannel(cdev->dev.parent); | |
591 | if (stsch(sch->irq, &sch->schib) || !sch->schib.pmcw.dnv) | |
592 | return -ENODEV; | |
593 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
594 | if (sch->schib.scsw.actl != 0) | |
595 | return -EBUSY; | |
596 | return -EINVAL; | |
597 | } | |
598 | if (sch->schib.scsw.actl != 0) | |
599 | return -EBUSY; | |
600 | /* Are we doing path grouping? */ | |
601 | if (!cdev->private->options.pgroup) { | |
602 | /* No, set state offline immediately. */ | |
603 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
604 | return 0; | |
605 | } | |
606 | /* Start Set Path Group commands. */ | |
607 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
608 | ccw_device_disband_start(cdev); | |
609 | return 0; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Handle timeout in device online/offline process. | |
614 | */ | |
615 | static void | |
616 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
617 | { | |
618 | int ret; | |
619 | ||
620 | ret = ccw_device_cancel_halt_clear(cdev); | |
621 | switch (ret) { | |
622 | case 0: | |
623 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
624 | break; | |
625 | case -ENODEV: | |
626 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
627 | break; | |
628 | default: | |
629 | ccw_device_set_timeout(cdev, 3*HZ); | |
630 | } | |
631 | } | |
632 | ||
633 | /* | |
634 | * Handle not oper event in device recognition. | |
635 | */ | |
636 | static void | |
637 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
638 | { | |
639 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
640 | } | |
641 | ||
642 | /* | |
643 | * Handle not operational event while offline. | |
644 | */ | |
645 | static void | |
646 | ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
647 | { | |
648 | struct subchannel *sch; | |
649 | ||
650 | cdev->private->state = DEV_STATE_NOT_OPER; | |
651 | sch = to_subchannel(cdev->dev.parent); | |
652 | if (get_device(&cdev->dev)) { | |
653 | PREPARE_WORK(&cdev->private->kick_work, | |
654 | ccw_device_call_sch_unregister, (void *)cdev); | |
655 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
656 | } | |
657 | wake_up(&cdev->private->wait_q); | |
658 | } | |
659 | ||
660 | /* | |
661 | * Handle not operational event while online. | |
662 | */ | |
663 | static void | |
664 | ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
665 | { | |
666 | struct subchannel *sch; | |
667 | ||
668 | sch = to_subchannel(cdev->dev.parent); | |
669 | if (sch->driver->notify && | |
670 | sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) { | |
671 | ccw_device_set_timeout(cdev, 0); | |
672 | cdev->private->flags.fake_irb = 0; | |
673 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
674 | wake_up(&cdev->private->wait_q); | |
675 | return; | |
676 | } | |
677 | cdev->private->state = DEV_STATE_NOT_OPER; | |
678 | cio_disable_subchannel(sch); | |
679 | if (sch->schib.scsw.actl != 0) { | |
680 | // FIXME: not-oper indication to device driver ? | |
681 | ccw_device_call_handler(cdev); | |
682 | } | |
683 | if (get_device(&cdev->dev)) { | |
684 | PREPARE_WORK(&cdev->private->kick_work, | |
685 | ccw_device_call_sch_unregister, (void *)cdev); | |
686 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
687 | } | |
688 | wake_up(&cdev->private->wait_q); | |
689 | } | |
690 | ||
691 | /* | |
692 | * Handle path verification event. | |
693 | */ | |
694 | static void | |
695 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
696 | { | |
697 | struct subchannel *sch; | |
698 | ||
699 | if (!cdev->private->options.pgroup) | |
700 | return; | |
701 | if (cdev->private->state == DEV_STATE_W4SENSE) { | |
702 | cdev->private->flags.doverify = 1; | |
703 | return; | |
704 | } | |
705 | sch = to_subchannel(cdev->dev.parent); | |
706 | /* | |
707 | * Since we might not just be coming from an interrupt from the | |
708 | * subchannel we have to update the schib. | |
709 | */ | |
710 | stsch(sch->irq, &sch->schib); | |
711 | ||
712 | if (sch->schib.scsw.actl != 0 || | |
713 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { | |
714 | /* | |
715 | * No final status yet or final status not yet delivered | |
716 | * to the device driver. Can't do path verfication now, | |
717 | * delay until final status was delivered. | |
718 | */ | |
719 | cdev->private->flags.doverify = 1; | |
720 | return; | |
721 | } | |
722 | /* Device is idle, we can do the path verification. */ | |
723 | cdev->private->state = DEV_STATE_VERIFY; | |
724 | ccw_device_verify_start(cdev); | |
725 | } | |
726 | ||
727 | /* | |
728 | * Got an interrupt for a normal io (state online). | |
729 | */ | |
730 | static void | |
731 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
732 | { | |
733 | struct irb *irb; | |
734 | ||
735 | irb = (struct irb *) __LC_IRB; | |
736 | /* Check for unsolicited interrupt. */ | |
737 | if ((irb->scsw.stctl == | |
738 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
739 | && (!irb->scsw.cc)) { | |
740 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
741 | !irb->esw.esw0.erw.cons) { | |
742 | /* Unit check but no sense data. Need basic sense. */ | |
743 | if (ccw_device_do_sense(cdev, irb) != 0) | |
744 | goto call_handler_unsol; | |
745 | memcpy(irb, &cdev->private->irb, sizeof(struct irb)); | |
746 | cdev->private->state = DEV_STATE_W4SENSE; | |
747 | cdev->private->intparm = 0; | |
748 | return; | |
749 | } | |
750 | call_handler_unsol: | |
751 | if (cdev->handler) | |
752 | cdev->handler (cdev, 0, irb); | |
753 | return; | |
754 | } | |
755 | /* Accumulate status and find out if a basic sense is needed. */ | |
756 | ccw_device_accumulate_irb(cdev, irb); | |
757 | if (cdev->private->flags.dosense) { | |
758 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
759 | cdev->private->state = DEV_STATE_W4SENSE; | |
760 | } | |
761 | return; | |
762 | } | |
763 | /* Call the handler. */ | |
764 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
765 | /* Start delayed path verification. */ | |
766 | ccw_device_online_verify(cdev, 0); | |
767 | } | |
768 | ||
769 | /* | |
770 | * Got an timeout in online state. | |
771 | */ | |
772 | static void | |
773 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
774 | { | |
775 | int ret; | |
776 | ||
777 | ccw_device_set_timeout(cdev, 0); | |
778 | ret = ccw_device_cancel_halt_clear(cdev); | |
779 | if (ret == -EBUSY) { | |
780 | ccw_device_set_timeout(cdev, 3*HZ); | |
781 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
782 | return; | |
783 | } | |
784 | if (ret == -ENODEV) { | |
785 | struct subchannel *sch; | |
786 | ||
787 | sch = to_subchannel(cdev->dev.parent); | |
788 | if (!sch->lpm) { | |
789 | PREPARE_WORK(&cdev->private->kick_work, | |
790 | ccw_device_nopath_notify, (void *)cdev); | |
791 | queue_work(ccw_device_notify_work, | |
792 | &cdev->private->kick_work); | |
793 | } else | |
794 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
795 | } else if (cdev->handler) | |
796 | cdev->handler(cdev, cdev->private->intparm, | |
797 | ERR_PTR(-ETIMEDOUT)); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Got an interrupt for a basic sense. | |
802 | */ | |
803 | void | |
804 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) | |
805 | { | |
806 | struct irb *irb; | |
807 | ||
808 | irb = (struct irb *) __LC_IRB; | |
809 | /* Check for unsolicited interrupt. */ | |
810 | if (irb->scsw.stctl == | |
811 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
812 | if (irb->scsw.cc == 1) | |
813 | /* Basic sense hasn't started. Try again. */ | |
814 | ccw_device_do_sense(cdev, irb); | |
815 | else { | |
816 | printk("Huh? %s(%s): unsolicited interrupt...\n", | |
817 | __FUNCTION__, cdev->dev.bus_id); | |
818 | if (cdev->handler) | |
819 | cdev->handler (cdev, 0, irb); | |
820 | } | |
821 | return; | |
822 | } | |
823 | /* Add basic sense info to irb. */ | |
824 | ccw_device_accumulate_basic_sense(cdev, irb); | |
825 | if (cdev->private->flags.dosense) { | |
826 | /* Another basic sense is needed. */ | |
827 | ccw_device_do_sense(cdev, irb); | |
828 | return; | |
829 | } | |
830 | cdev->private->state = DEV_STATE_ONLINE; | |
831 | /* Call the handler. */ | |
832 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
833 | /* Start delayed path verification. */ | |
834 | ccw_device_online_verify(cdev, 0); | |
835 | } | |
836 | ||
837 | static void | |
838 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
839 | { | |
840 | struct irb *irb; | |
841 | ||
842 | irb = (struct irb *) __LC_IRB; | |
843 | /* Accumulate status. We don't do basic sense. */ | |
844 | ccw_device_accumulate_irb(cdev, irb); | |
845 | /* Try to start delayed device verification. */ | |
846 | ccw_device_online_verify(cdev, 0); | |
847 | /* Note: Don't call handler for cio initiated clear! */ | |
848 | } | |
849 | ||
850 | static void | |
851 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
852 | { | |
853 | struct subchannel *sch; | |
854 | ||
855 | sch = to_subchannel(cdev->dev.parent); | |
856 | ccw_device_set_timeout(cdev, 0); | |
857 | /* OK, i/o is dead now. Call interrupt handler. */ | |
858 | cdev->private->state = DEV_STATE_ONLINE; | |
859 | if (cdev->handler) | |
860 | cdev->handler(cdev, cdev->private->intparm, | |
861 | ERR_PTR(-ETIMEDOUT)); | |
862 | if (!sch->lpm) { | |
863 | PREPARE_WORK(&cdev->private->kick_work, | |
864 | ccw_device_nopath_notify, (void *)cdev); | |
865 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
866 | } else if (cdev->private->flags.doverify) | |
867 | /* Start delayed path verification. */ | |
868 | ccw_device_online_verify(cdev, 0); | |
869 | } | |
870 | ||
871 | static void | |
872 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
873 | { | |
874 | int ret; | |
875 | ||
876 | ret = ccw_device_cancel_halt_clear(cdev); | |
877 | if (ret == -EBUSY) { | |
878 | ccw_device_set_timeout(cdev, 3*HZ); | |
879 | return; | |
880 | } | |
881 | if (ret == -ENODEV) { | |
882 | struct subchannel *sch; | |
883 | ||
884 | sch = to_subchannel(cdev->dev.parent); | |
885 | if (!sch->lpm) { | |
886 | PREPARE_WORK(&cdev->private->kick_work, | |
887 | ccw_device_nopath_notify, (void *)cdev); | |
888 | queue_work(ccw_device_notify_work, | |
889 | &cdev->private->kick_work); | |
890 | } else | |
891 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
892 | return; | |
893 | } | |
894 | //FIXME: Can we get here? | |
895 | cdev->private->state = DEV_STATE_ONLINE; | |
896 | if (cdev->handler) | |
897 | cdev->handler(cdev, cdev->private->intparm, | |
898 | ERR_PTR(-ETIMEDOUT)); | |
899 | } | |
900 | ||
901 | static void | |
902 | ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
903 | { | |
904 | struct irb *irb; | |
905 | struct subchannel *sch; | |
906 | ||
907 | irb = (struct irb *) __LC_IRB; | |
908 | /* | |
909 | * Accumulate status and find out if a basic sense is needed. | |
910 | * This is fine since we have already adapted the lpm. | |
911 | */ | |
912 | ccw_device_accumulate_irb(cdev, irb); | |
913 | if (cdev->private->flags.dosense) { | |
914 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
915 | cdev->private->state = DEV_STATE_W4SENSE; | |
916 | } | |
917 | return; | |
918 | } | |
919 | ||
920 | /* Iff device is idle, reset timeout. */ | |
921 | sch = to_subchannel(cdev->dev.parent); | |
922 | if (!stsch(sch->irq, &sch->schib)) | |
923 | if (sch->schib.scsw.actl == 0) | |
924 | ccw_device_set_timeout(cdev, 0); | |
925 | /* Call the handler. */ | |
926 | ccw_device_call_handler(cdev); | |
927 | if (!sch->lpm) { | |
928 | PREPARE_WORK(&cdev->private->kick_work, | |
929 | ccw_device_nopath_notify, (void *)cdev); | |
930 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
931 | } else if (cdev->private->flags.doverify) | |
932 | ccw_device_online_verify(cdev, 0); | |
933 | } | |
934 | ||
935 | static void | |
936 | ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
937 | { | |
938 | int ret; | |
939 | struct subchannel *sch; | |
940 | ||
941 | sch = to_subchannel(cdev->dev.parent); | |
942 | ccw_device_set_timeout(cdev, 0); | |
943 | ret = ccw_device_cancel_halt_clear(cdev); | |
944 | if (ret == -EBUSY) { | |
945 | ccw_device_set_timeout(cdev, 3*HZ); | |
946 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
947 | return; | |
948 | } | |
949 | if (ret == -ENODEV) { | |
950 | if (!sch->lpm) { | |
951 | PREPARE_WORK(&cdev->private->kick_work, | |
952 | ccw_device_nopath_notify, (void *)cdev); | |
953 | queue_work(ccw_device_notify_work, | |
954 | &cdev->private->kick_work); | |
955 | } else | |
956 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
957 | return; | |
958 | } | |
959 | if (cdev->handler) | |
960 | cdev->handler(cdev, cdev->private->intparm, | |
961 | ERR_PTR(-ETIMEDOUT)); | |
962 | if (!sch->lpm) { | |
963 | PREPARE_WORK(&cdev->private->kick_work, | |
964 | ccw_device_nopath_notify, (void *)cdev); | |
965 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
966 | } else if (cdev->private->flags.doverify) | |
967 | /* Start delayed path verification. */ | |
968 | ccw_device_online_verify(cdev, 0); | |
969 | } | |
970 | ||
971 | static void | |
972 | ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
973 | { | |
974 | /* When the I/O has terminated, we have to start verification. */ | |
975 | if (cdev->private->options.pgroup) | |
976 | cdev->private->flags.doverify = 1; | |
977 | } | |
978 | ||
979 | static void | |
980 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
981 | { | |
982 | struct irb *irb; | |
983 | ||
984 | switch (dev_event) { | |
985 | case DEV_EVENT_INTERRUPT: | |
986 | irb = (struct irb *) __LC_IRB; | |
987 | /* Check for unsolicited interrupt. */ | |
988 | if ((irb->scsw.stctl == | |
989 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && | |
990 | (!irb->scsw.cc)) | |
991 | /* FIXME: we should restart stlck here, but this | |
992 | * is extremely unlikely ... */ | |
993 | goto out_wakeup; | |
994 | ||
995 | ccw_device_accumulate_irb(cdev, irb); | |
996 | /* We don't care about basic sense etc. */ | |
997 | break; | |
998 | default: /* timeout */ | |
999 | break; | |
1000 | } | |
1001 | out_wakeup: | |
1002 | wake_up(&cdev->private->wait_q); | |
1003 | } | |
1004 | ||
1005 | static void | |
1006 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1007 | { | |
1008 | struct subchannel *sch; | |
1009 | ||
1010 | sch = to_subchannel(cdev->dev.parent); | |
1011 | if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0) | |
1012 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
1013 | return; | |
1014 | ||
1015 | /* After 60s the device recognition is considered to have failed. */ | |
1016 | ccw_device_set_timeout(cdev, 60*HZ); | |
1017 | ||
1018 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1019 | ccw_device_sense_id_start(cdev); | |
1020 | } | |
1021 | ||
1022 | void | |
1023 | device_trigger_reprobe(struct subchannel *sch) | |
1024 | { | |
1025 | struct ccw_device *cdev; | |
1026 | ||
1027 | if (!sch->dev.driver_data) | |
1028 | return; | |
1029 | cdev = sch->dev.driver_data; | |
1030 | if (cdev->private->state != DEV_STATE_DISCONNECTED) | |
1031 | return; | |
1032 | ||
1033 | /* Update some values. */ | |
1034 | if (stsch(sch->irq, &sch->schib)) | |
1035 | return; | |
1036 | ||
1037 | /* | |
1038 | * The pim, pam, pom values may not be accurate, but they are the best | |
1039 | * we have before performing device selection :/ | |
1040 | */ | |
1041 | sch->lpm = sch->schib.pmcw.pim & | |
1042 | sch->schib.pmcw.pam & | |
1043 | sch->schib.pmcw.pom & | |
1044 | sch->opm; | |
1045 | /* Re-set some bits in the pmcw that were lost. */ | |
1046 | sch->schib.pmcw.isc = 3; | |
1047 | sch->schib.pmcw.csense = 1; | |
1048 | sch->schib.pmcw.ena = 0; | |
1049 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1050 | sch->schib.pmcw.mp = 1; | |
1051 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
1052 | /* We should also udate ssd info, but this has to wait. */ | |
1053 | ccw_device_start_id(cdev, 0); | |
1054 | } | |
1055 | ||
1056 | static void | |
1057 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1058 | { | |
1059 | struct subchannel *sch; | |
1060 | ||
1061 | sch = to_subchannel(cdev->dev.parent); | |
1062 | /* | |
1063 | * An interrupt in state offline means a previous disable was not | |
1064 | * successful. Try again. | |
1065 | */ | |
1066 | cio_disable_subchannel(sch); | |
1067 | } | |
1068 | ||
1069 | static void | |
1070 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1071 | { | |
1072 | retry_set_schib(cdev); | |
1073 | cdev->private->state = DEV_STATE_ONLINE; | |
1074 | dev_fsm_event(cdev, dev_event); | |
1075 | } | |
1076 | ||
1077 | ||
1078 | static void | |
1079 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1080 | { | |
1081 | ccw_device_set_timeout(cdev, 0); | |
1082 | if (dev_event == DEV_EVENT_NOTOPER) | |
1083 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1084 | else | |
1085 | cdev->private->state = DEV_STATE_OFFLINE; | |
1086 | wake_up(&cdev->private->wait_q); | |
1087 | } | |
1088 | ||
1089 | static void | |
1090 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1091 | { | |
1092 | int ret; | |
1093 | ||
1094 | ret = ccw_device_cancel_halt_clear(cdev); | |
1095 | switch (ret) { | |
1096 | case 0: | |
1097 | cdev->private->state = DEV_STATE_OFFLINE; | |
1098 | wake_up(&cdev->private->wait_q); | |
1099 | break; | |
1100 | case -ENODEV: | |
1101 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1102 | wake_up(&cdev->private->wait_q); | |
1103 | break; | |
1104 | default: | |
1105 | ccw_device_set_timeout(cdev, HZ/10); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * No operation action. This is used e.g. to ignore a timeout event in | |
1111 | * state offline. | |
1112 | */ | |
1113 | static void | |
1114 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1115 | { | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Bug operation action. | |
1120 | */ | |
1121 | static void | |
1122 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1123 | { | |
1124 | printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n", | |
1125 | cdev->private->state, dev_event); | |
1126 | BUG(); | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * device statemachine | |
1131 | */ | |
1132 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1133 | [DEV_STATE_NOT_OPER] = { | |
1134 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1135 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1136 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1137 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1138 | }, | |
1139 | [DEV_STATE_SENSE_PGID] = { | |
1140 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1141 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, | |
1142 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1143 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1144 | }, | |
1145 | [DEV_STATE_SENSE_ID] = { | |
1146 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1147 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1148 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1149 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1150 | }, | |
1151 | [DEV_STATE_OFFLINE] = { | |
1152 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1153 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, | |
1154 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1155 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1156 | }, | |
1157 | [DEV_STATE_VERIFY] = { | |
1158 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1159 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, | |
1160 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1161 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1162 | }, | |
1163 | [DEV_STATE_ONLINE] = { | |
1164 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1165 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, | |
1166 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1167 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1168 | }, | |
1169 | [DEV_STATE_W4SENSE] = { | |
1170 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1171 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, | |
1172 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1173 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1174 | }, | |
1175 | [DEV_STATE_DISBAND_PGID] = { | |
1176 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1177 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, | |
1178 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1179 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1180 | }, | |
1181 | [DEV_STATE_BOXED] = { | |
1182 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1183 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, | |
1184 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1185 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1186 | }, | |
1187 | /* states to wait for i/o completion before doing something */ | |
1188 | [DEV_STATE_CLEAR_VERIFY] = { | |
1189 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1190 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, | |
1191 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1192 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1193 | }, | |
1194 | [DEV_STATE_TIMEOUT_KILL] = { | |
1195 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1196 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, | |
1197 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1198 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1199 | }, | |
1200 | [DEV_STATE_WAIT4IO] = { | |
1201 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1202 | [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq, | |
1203 | [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout, | |
1204 | [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify, | |
1205 | }, | |
1206 | [DEV_STATE_QUIESCE] = { | |
1207 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1208 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1209 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1210 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1211 | }, | |
1212 | /* special states for devices gone not operational */ | |
1213 | [DEV_STATE_DISCONNECTED] = { | |
1214 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1215 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1216 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
1217 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1218 | }, | |
1219 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1220 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1221 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1222 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1223 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1224 | }, | |
1225 | [DEV_STATE_CMFCHANGE] = { | |
1226 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1227 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1228 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1229 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1230 | }, | |
1231 | }; | |
1232 | ||
1233 | /* | |
1234 | * io_subchannel_irq is called for "real" interrupts or for status | |
1235 | * pending conditions on msch. | |
1236 | */ | |
1237 | void | |
1238 | io_subchannel_irq (struct device *pdev) | |
1239 | { | |
1240 | struct ccw_device *cdev; | |
1241 | ||
1242 | cdev = to_subchannel(pdev)->dev.driver_data; | |
1243 | ||
1244 | CIO_TRACE_EVENT (3, "IRQ"); | |
1245 | CIO_TRACE_EVENT (3, pdev->bus_id); | |
1246 | if (cdev) | |
1247 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1248 | } | |
1249 | ||
1250 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |