Commit | Line | Data |
---|---|---|
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 | |
4ce3b30c | 7 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
1da177e4 | 12 | #include <linux/init.h> |
4e57b681 TS |
13 | #include <linux/jiffies.h> |
14 | #include <linux/string.h> | |
1da177e4 LT |
15 | |
16 | #include <asm/ccwdev.h> | |
4c24da79 | 17 | #include <asm/cio.h> |
e5854a58 | 18 | #include <asm/chpid.h> |
1da177e4 LT |
19 | |
20 | #include "cio.h" | |
21 | #include "cio_debug.h" | |
22 | #include "css.h" | |
23 | #include "device.h" | |
24 | #include "chsc.h" | |
25 | #include "ioasm.h" | |
e6b6e10a | 26 | #include "chp.h" |
1da177e4 LT |
27 | |
28 | int | |
29 | device_is_online(struct subchannel *sch) | |
30 | { | |
31 | struct ccw_device *cdev; | |
32 | ||
33 | if (!sch->dev.driver_data) | |
34 | return 0; | |
35 | cdev = sch->dev.driver_data; | |
36 | return (cdev->private->state == DEV_STATE_ONLINE); | |
37 | } | |
38 | ||
39 | int | |
40 | device_is_disconnected(struct subchannel *sch) | |
41 | { | |
42 | struct ccw_device *cdev; | |
43 | ||
44 | if (!sch->dev.driver_data) | |
45 | return 0; | |
46 | cdev = sch->dev.driver_data; | |
47 | return (cdev->private->state == DEV_STATE_DISCONNECTED || | |
48 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
49 | } | |
50 | ||
51 | void | |
52 | device_set_disconnected(struct subchannel *sch) | |
53 | { | |
54 | struct ccw_device *cdev; | |
55 | ||
56 | if (!sch->dev.driver_data) | |
57 | return; | |
58 | cdev = sch->dev.driver_data; | |
59 | ccw_device_set_timeout(cdev, 0); | |
60 | cdev->private->flags.fake_irb = 0; | |
61 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
62 | } | |
63 | ||
d23861ff CH |
64 | void device_set_intretry(struct subchannel *sch) |
65 | { | |
66 | struct ccw_device *cdev; | |
67 | ||
68 | cdev = sch->dev.driver_data; | |
69 | if (!cdev) | |
70 | return; | |
71 | cdev->private->flags.intretry = 1; | |
72 | } | |
73 | ||
24cb5b48 CH |
74 | int device_trigger_verify(struct subchannel *sch) |
75 | { | |
76 | struct ccw_device *cdev; | |
77 | ||
78 | cdev = sch->dev.driver_data; | |
79 | if (!cdev || !cdev->online) | |
80 | return -EINVAL; | |
81 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
82 | return 0; | |
83 | } | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
87 | */ | |
88 | static void | |
89 | ccw_device_timeout(unsigned long data) | |
90 | { | |
91 | struct ccw_device *cdev; | |
92 | ||
93 | cdev = (struct ccw_device *) data; | |
94 | spin_lock_irq(cdev->ccwlock); | |
95 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); | |
96 | spin_unlock_irq(cdev->ccwlock); | |
97 | } | |
98 | ||
99 | /* | |
100 | * Set timeout | |
101 | */ | |
102 | void | |
103 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
104 | { | |
105 | if (expires == 0) { | |
106 | del_timer(&cdev->private->timer); | |
107 | return; | |
108 | } | |
109 | if (timer_pending(&cdev->private->timer)) { | |
110 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
111 | return; | |
112 | } | |
113 | cdev->private->timer.function = ccw_device_timeout; | |
114 | cdev->private->timer.data = (unsigned long) cdev; | |
115 | cdev->private->timer.expires = jiffies + expires; | |
116 | add_timer(&cdev->private->timer); | |
117 | } | |
118 | ||
119 | /* Kill any pending timers after machine check. */ | |
120 | void | |
121 | device_kill_pending_timer(struct subchannel *sch) | |
122 | { | |
123 | struct ccw_device *cdev; | |
124 | ||
125 | if (!sch->dev.driver_data) | |
126 | return; | |
127 | cdev = sch->dev.driver_data; | |
128 | ccw_device_set_timeout(cdev, 0); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
133 | * asynchronous operations. We do one try with cio_cancel, two tries | |
134 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
135 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
136 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
137 | * status pending). | |
138 | */ | |
139 | int | |
140 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
141 | { | |
142 | struct subchannel *sch; | |
143 | int ret; | |
144 | ||
145 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 146 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
147 | if (ret || !sch->schib.pmcw.dnv) |
148 | return -ENODEV; | |
2470b648 CH |
149 | if (!sch->schib.pmcw.ena) |
150 | /* Not operational -> done. */ | |
1da177e4 LT |
151 | return 0; |
152 | /* Stage 1: cancel io. */ | |
153 | if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) && | |
154 | !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
155 | ret = cio_cancel(sch); | |
156 | if (ret != -EINVAL) | |
157 | return ret; | |
158 | /* cancel io unsuccessful. From now on it is asynchronous. */ | |
159 | cdev->private->iretry = 3; /* 3 halt retries. */ | |
160 | } | |
161 | if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
162 | /* Stage 2: halt io. */ | |
163 | if (cdev->private->iretry) { | |
164 | cdev->private->iretry--; | |
165 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
166 | if (ret != -EBUSY) |
167 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
168 | } |
169 | /* halt io unsuccessful. */ | |
170 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
171 | } | |
172 | /* Stage 3: clear io. */ | |
173 | if (cdev->private->iretry) { | |
174 | cdev->private->iretry--; | |
175 | ret = cio_clear (sch); | |
176 | return (ret == 0) ? -EBUSY : ret; | |
177 | } | |
178 | panic("Can't stop i/o on subchannel.\n"); | |
179 | } | |
180 | ||
181 | static int | |
182 | ccw_device_handle_oper(struct ccw_device *cdev) | |
183 | { | |
184 | struct subchannel *sch; | |
185 | ||
186 | sch = to_subchannel(cdev->dev.parent); | |
187 | cdev->private->flags.recog_done = 1; | |
188 | /* | |
189 | * Check if cu type and device type still match. If | |
190 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 191 | * de- and re-register. |
1da177e4 LT |
192 | */ |
193 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
194 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
195 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 196 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 197 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 198 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
199 | queue_work(ccw_device_work, &cdev->private->kick_work); |
200 | return 0; | |
201 | } | |
202 | cdev->private->flags.donotify = 1; | |
203 | return 1; | |
204 | } | |
205 | ||
206 | /* | |
207 | * The machine won't give us any notification by machine check if a chpid has | |
208 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
209 | * the channel subsystem to device selection and updating our path masks). | |
210 | */ | |
4d284cac | 211 | static void |
1da177e4 LT |
212 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
213 | { | |
214 | int mask, i; | |
f86635fa | 215 | struct chp_id chpid; |
1da177e4 | 216 | |
f86635fa | 217 | chp_id_init(&chpid); |
1da177e4 LT |
218 | for (i = 0; i<8; i++) { |
219 | mask = 0x80 >> i; | |
220 | if (!(sch->lpm & mask)) | |
221 | continue; | |
222 | if (old_lpm & mask) | |
223 | continue; | |
f86635fa | 224 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
225 | if (!chp_is_registered(chpid)) |
226 | css_schedule_eval_all(); | |
1da177e4 LT |
227 | } |
228 | } | |
229 | ||
230 | /* | |
231 | * Stop device recognition. | |
232 | */ | |
233 | static void | |
234 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
235 | { | |
236 | struct subchannel *sch; | |
237 | int notify, old_lpm, same_dev; | |
238 | ||
239 | sch = to_subchannel(cdev->dev.parent); | |
240 | ||
241 | ccw_device_set_timeout(cdev, 0); | |
242 | cio_disable_subchannel(sch); | |
243 | /* | |
244 | * Now that we tried recognition, we have performed device selection | |
245 | * through ssch() and the path information is up to date. | |
246 | */ | |
247 | old_lpm = sch->lpm; | |
a8237fc4 | 248 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 249 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
250 | /* Check since device may again have become not operational. */ |
251 | if (!sch->schib.pmcw.dnv) | |
252 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
253 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
254 | /* Force reprobe on all chpids. */ | |
255 | old_lpm = 0; | |
256 | if (sch->lpm != old_lpm) | |
257 | __recover_lost_chpids(sch, old_lpm); | |
258 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
259 | if (state == DEV_STATE_NOT_OPER) { | |
260 | cdev->private->flags.recog_done = 1; | |
261 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
262 | return; | |
263 | } | |
264 | /* Boxed devices don't need extra treatment. */ | |
265 | } | |
266 | notify = 0; | |
267 | same_dev = 0; /* Keep the compiler quiet... */ | |
268 | switch (state) { | |
269 | case DEV_STATE_NOT_OPER: | |
270 | CIO_DEBUG(KERN_WARNING, 2, | |
e556bbbd | 271 | "cio: SenseID : unknown device %04x on subchannel " |
78964268 | 272 | "0.%x.%04x\n", cdev->private->dev_id.devno, |
fb6958a5 | 273 | sch->schid.ssid, sch->schid.sch_no); |
1da177e4 LT |
274 | break; |
275 | case DEV_STATE_OFFLINE: | |
276 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
277 | same_dev = ccw_device_handle_oper(cdev); | |
278 | notify = 1; | |
279 | } | |
280 | /* fill out sense information */ | |
81388d2a | 281 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
282 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
283 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
284 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
285 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
286 | if (notify) { |
287 | cdev->private->state = DEV_STATE_OFFLINE; | |
288 | if (same_dev) { | |
289 | /* Get device online again. */ | |
290 | ccw_device_online(cdev); | |
291 | wake_up(&cdev->private->wait_q); | |
292 | } | |
293 | return; | |
294 | } | |
295 | /* Issue device info message. */ | |
e556bbbd CH |
296 | CIO_DEBUG(KERN_INFO, 2, |
297 | "cio: SenseID : device 0.%x.%04x reports: " | |
1da177e4 | 298 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " |
fb6958a5 | 299 | "%04X/%02X\n", |
78964268 CH |
300 | cdev->private->dev_id.ssid, |
301 | cdev->private->dev_id.devno, | |
1da177e4 LT |
302 | cdev->id.cu_type, cdev->id.cu_model, |
303 | cdev->id.dev_type, cdev->id.dev_model); | |
304 | break; | |
305 | case DEV_STATE_BOXED: | |
306 | CIO_DEBUG(KERN_WARNING, 2, | |
e556bbbd | 307 | "cio: SenseID : boxed device %04x on subchannel " |
78964268 | 308 | "0.%x.%04x\n", cdev->private->dev_id.devno, |
fb6958a5 | 309 | sch->schid.ssid, sch->schid.sch_no); |
1da177e4 LT |
310 | break; |
311 | } | |
312 | cdev->private->state = state; | |
313 | io_subchannel_recog_done(cdev); | |
314 | if (state != DEV_STATE_NOT_OPER) | |
315 | wake_up(&cdev->private->wait_q); | |
316 | } | |
317 | ||
318 | /* | |
319 | * Function called from device_id.c after sense id has completed. | |
320 | */ | |
321 | void | |
322 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
323 | { | |
324 | switch (err) { | |
325 | case 0: | |
326 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
327 | break; | |
328 | case -ETIME: /* Sense id stopped by timeout. */ | |
329 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
330 | break; | |
331 | default: | |
332 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
333 | break; | |
334 | } | |
335 | } | |
336 | ||
337 | static void | |
c1637532 | 338 | ccw_device_oper_notify(struct work_struct *work) |
1da177e4 | 339 | { |
c1637532 | 340 | struct ccw_device_private *priv; |
1da177e4 LT |
341 | struct ccw_device *cdev; |
342 | struct subchannel *sch; | |
343 | int ret; | |
ee04bbcc | 344 | unsigned long flags; |
1da177e4 | 345 | |
c1637532 MS |
346 | priv = container_of(work, struct ccw_device_private, kick_work); |
347 | cdev = priv->cdev; | |
ee04bbcc | 348 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 349 | sch = to_subchannel(cdev->dev.parent); |
ee04bbcc CH |
350 | if (sch->driver && sch->driver->notify) { |
351 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
352 | ret = sch->driver->notify(&sch->dev, CIO_OPER); | |
353 | spin_lock_irqsave(cdev->ccwlock, flags); | |
354 | } else | |
355 | ret = 0; | |
356 | if (ret) { | |
94bb0633 | 357 | /* Reenable channel measurements, if needed. */ |
ee04bbcc | 358 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
94bb0633 | 359 | cmf_reenable(cdev); |
ee04bbcc | 360 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 361 | wake_up(&cdev->private->wait_q); |
94bb0633 | 362 | } |
ee04bbcc CH |
363 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
364 | if (!ret) | |
365 | /* Driver doesn't want device back. */ | |
366 | ccw_device_do_unreg_rereg(work); | |
1da177e4 LT |
367 | } |
368 | ||
369 | /* | |
370 | * Finished with online/offline processing. | |
371 | */ | |
372 | static void | |
373 | ccw_device_done(struct ccw_device *cdev, int state) | |
374 | { | |
375 | struct subchannel *sch; | |
376 | ||
377 | sch = to_subchannel(cdev->dev.parent); | |
378 | ||
f1ee3281 CH |
379 | ccw_device_set_timeout(cdev, 0); |
380 | ||
1da177e4 LT |
381 | if (state != DEV_STATE_ONLINE) |
382 | cio_disable_subchannel(sch); | |
383 | ||
384 | /* Reset device status. */ | |
385 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
386 | ||
387 | cdev->private->state = state; | |
388 | ||
389 | ||
390 | if (state == DEV_STATE_BOXED) | |
391 | CIO_DEBUG(KERN_WARNING, 2, | |
e556bbbd | 392 | "cio: Boxed device %04x on subchannel %04x\n", |
78964268 | 393 | cdev->private->dev_id.devno, sch->schid.sch_no); |
1da177e4 LT |
394 | |
395 | if (cdev->private->flags.donotify) { | |
396 | cdev->private->flags.donotify = 0; | |
c1637532 | 397 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify); |
1da177e4 LT |
398 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
399 | } | |
400 | wake_up(&cdev->private->wait_q); | |
401 | ||
402 | if (css_init_done && state != DEV_STATE_ONLINE) | |
403 | put_device (&cdev->dev); | |
404 | } | |
405 | ||
4d284cac | 406 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
407 | { |
408 | char *c1; | |
409 | char *c2; | |
410 | ||
411 | c1 = (char *)p1; | |
412 | c2 = (char *)p2; | |
413 | ||
414 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
415 | } | |
416 | ||
417 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
418 | { | |
419 | int i; | |
420 | int last; | |
421 | ||
422 | last = 0; | |
423 | for (i = 0; i < 8; i++) { | |
424 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
425 | /* No PGID yet */ | |
426 | continue; | |
427 | if (cdev->private->pgid[last].inf.ps.state1 == | |
428 | SNID_STATE1_RESET) { | |
429 | /* First non-zero PGID */ | |
430 | last = i; | |
431 | continue; | |
432 | } | |
433 | if (cmp_pgid(&cdev->private->pgid[i], | |
434 | &cdev->private->pgid[last]) == 0) | |
435 | /* Non-conflicting PGIDs */ | |
436 | continue; | |
437 | ||
438 | /* PGID mismatch, can't pathgroup. */ | |
439 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
440 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
441 | cdev->private->dev_id.ssid, |
442 | cdev->private->dev_id.devno); | |
7e560814 CH |
443 | cdev->private->options.pgroup = 0; |
444 | return; | |
445 | } | |
446 | if (cdev->private->pgid[last].inf.ps.state1 == | |
447 | SNID_STATE1_RESET) | |
448 | /* No previous pgid found */ | |
7c9f4e3a CH |
449 | memcpy(&cdev->private->pgid[0], |
450 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
451 | sizeof(struct pgid)); |
452 | else | |
453 | /* Use existing pgid */ | |
454 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
455 | sizeof(struct pgid)); | |
456 | } | |
457 | ||
1da177e4 LT |
458 | /* |
459 | * Function called from device_pgid.c after sense path ground has completed. | |
460 | */ | |
461 | void | |
462 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
463 | { | |
464 | struct subchannel *sch; | |
465 | ||
466 | sch = to_subchannel(cdev->dev.parent); | |
467 | switch (err) { | |
7e560814 CH |
468 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
469 | cdev->private->options.pgroup = 0; | |
470 | break; | |
471 | case 0: /* success */ | |
472 | case -EACCES: /* partial success, some paths not operational */ | |
473 | /* Check if all pgids are equal or 0. */ | |
474 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
475 | break; |
476 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
477 | case -EUSERS: /* device is reserved for someone else. */ | |
478 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 479 | return; |
1da177e4 LT |
480 | default: |
481 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 482 | return; |
1da177e4 | 483 | } |
7e560814 | 484 | /* Start Path Group verification. */ |
7e560814 | 485 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 486 | cdev->private->flags.doverify = 0; |
7e560814 | 487 | ccw_device_verify_start(cdev); |
1da177e4 LT |
488 | } |
489 | ||
490 | /* | |
491 | * Start device recognition. | |
492 | */ | |
493 | int | |
494 | ccw_device_recognition(struct ccw_device *cdev) | |
495 | { | |
496 | struct subchannel *sch; | |
497 | int ret; | |
498 | ||
499 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
500 | (cdev->private->state != DEV_STATE_BOXED)) | |
501 | return -EINVAL; | |
502 | sch = to_subchannel(cdev->dev.parent); | |
503 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
504 | if (ret != 0) | |
505 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
506 | return ret; | |
507 | ||
508 | /* After 60s the device recognition is considered to have failed. */ | |
509 | ccw_device_set_timeout(cdev, 60*HZ); | |
510 | ||
511 | /* | |
512 | * We used to start here with a sense pgid to find out whether a device | |
513 | * is locked by someone else. Unfortunately, the sense pgid command | |
514 | * code has other meanings on devices predating the path grouping | |
515 | * algorithm, so we start with sense id and box the device after an | |
516 | * timeout (or if sense pgid during path verification detects the device | |
517 | * is locked, as may happen on newer devices). | |
518 | */ | |
519 | cdev->private->flags.recog_done = 0; | |
520 | cdev->private->state = DEV_STATE_SENSE_ID; | |
521 | ccw_device_sense_id_start(cdev); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Handle timeout in device recognition. | |
527 | */ | |
528 | static void | |
529 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
530 | { | |
531 | int ret; | |
532 | ||
533 | ret = ccw_device_cancel_halt_clear(cdev); | |
534 | switch (ret) { | |
535 | case 0: | |
536 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
537 | break; | |
538 | case -ENODEV: | |
539 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
540 | break; | |
541 | default: | |
542 | ccw_device_set_timeout(cdev, 3*HZ); | |
543 | } | |
544 | } | |
545 | ||
546 | ||
1da177e4 LT |
547 | void |
548 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
549 | { | |
28bdc6f6 PO |
550 | struct subchannel *sch; |
551 | ||
552 | sch = to_subchannel(cdev->dev.parent); | |
553 | /* Update schib - pom may have changed. */ | |
554 | stsch(sch->schid, &sch->schib); | |
555 | /* Update lpm with verified path mask. */ | |
556 | sch->lpm = sch->vpm; | |
557 | /* Repeat path verification? */ | |
558 | if (cdev->private->flags.doverify) { | |
559 | cdev->private->flags.doverify = 0; | |
560 | ccw_device_verify_start(cdev); | |
561 | return; | |
562 | } | |
1da177e4 LT |
563 | switch (err) { |
564 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
565 | cdev->private->options.pgroup = 0; | |
566 | case 0: | |
567 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
568 | /* Deliver fake irb to device driver, if needed. */ | |
569 | if (cdev->private->flags.fake_irb) { | |
570 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
292888c8 HC |
571 | cdev->private->irb.scsw.cc = 1; |
572 | cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC; | |
573 | cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND; | |
574 | cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
575 | cdev->private->flags.fake_irb = 0; |
576 | if (cdev->handler) | |
577 | cdev->handler(cdev, cdev->private->intparm, | |
578 | &cdev->private->irb); | |
579 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
580 | } | |
581 | break; | |
582 | case -ETIME: | |
8b42f5c2 PO |
583 | /* Reset oper notify indication after verify error. */ |
584 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
585 | ccw_device_done(cdev, DEV_STATE_BOXED); |
586 | break; | |
587 | default: | |
8b42f5c2 PO |
588 | /* Reset oper notify indication after verify error. */ |
589 | cdev->private->flags.donotify = 0; | |
3f4cf6e7 CH |
590 | if (cdev->online) |
591 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
592 | else | |
ee04bbcc | 593 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
594 | break; |
595 | } | |
596 | } | |
597 | ||
598 | /* | |
599 | * Get device online. | |
600 | */ | |
601 | int | |
602 | ccw_device_online(struct ccw_device *cdev) | |
603 | { | |
604 | struct subchannel *sch; | |
605 | int ret; | |
606 | ||
607 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
608 | (cdev->private->state != DEV_STATE_BOXED)) | |
609 | return -EINVAL; | |
610 | sch = to_subchannel(cdev->dev.parent); | |
611 | if (css_init_done && !get_device(&cdev->dev)) | |
612 | return -ENODEV; | |
613 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
614 | if (ret != 0) { | |
615 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
616 | if (ret == -ENODEV) | |
617 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
618 | return ret; | |
619 | } | |
620 | /* Do we want to do path grouping? */ | |
621 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
622 | /* Start initial path verification. */ |
623 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 624 | cdev->private->flags.doverify = 0; |
7e560814 | 625 | ccw_device_verify_start(cdev); |
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | /* Do a SensePGID first. */ | |
629 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
630 | ccw_device_sense_pgid_start(cdev); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | void | |
635 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
636 | { | |
637 | switch (err) { | |
638 | case 0: | |
639 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
640 | break; | |
641 | case -ETIME: | |
642 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
643 | break; | |
644 | default: | |
3ecb0a5a | 645 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 646 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
647 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
652 | /* | |
653 | * Shutdown device. | |
654 | */ | |
655 | int | |
656 | ccw_device_offline(struct ccw_device *cdev) | |
657 | { | |
658 | struct subchannel *sch; | |
659 | ||
d7b5a4c9 CH |
660 | if (ccw_device_is_orphan(cdev)) { |
661 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
662 | return 0; | |
663 | } | |
1da177e4 | 664 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 665 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
666 | return -ENODEV; |
667 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
668 | if (sch->schib.scsw.actl != 0) | |
669 | return -EBUSY; | |
670 | return -EINVAL; | |
671 | } | |
672 | if (sch->schib.scsw.actl != 0) | |
673 | return -EBUSY; | |
674 | /* Are we doing path grouping? */ | |
675 | if (!cdev->private->options.pgroup) { | |
676 | /* No, set state offline immediately. */ | |
677 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
678 | return 0; | |
679 | } | |
680 | /* Start Set Path Group commands. */ | |
681 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
682 | ccw_device_disband_start(cdev); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Handle timeout in device online/offline process. | |
688 | */ | |
689 | static void | |
690 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
691 | { | |
692 | int ret; | |
693 | ||
694 | ret = ccw_device_cancel_halt_clear(cdev); | |
695 | switch (ret) { | |
696 | case 0: | |
697 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
698 | break; | |
699 | case -ENODEV: | |
700 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
701 | break; | |
702 | default: | |
703 | ccw_device_set_timeout(cdev, 3*HZ); | |
704 | } | |
705 | } | |
706 | ||
707 | /* | |
708 | * Handle not oper event in device recognition. | |
709 | */ | |
710 | static void | |
711 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
712 | { | |
713 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
714 | } | |
715 | ||
716 | /* | |
3f4cf6e7 | 717 | * Handle not operational event in non-special state. |
1da177e4 | 718 | */ |
3f4cf6e7 CH |
719 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
720 | enum dev_event dev_event) | |
1da177e4 LT |
721 | { |
722 | struct subchannel *sch; | |
723 | ||
724 | cdev->private->state = DEV_STATE_NOT_OPER; | |
725 | sch = to_subchannel(cdev->dev.parent); | |
3f4cf6e7 | 726 | css_schedule_eval(sch->schid); |
1da177e4 LT |
727 | } |
728 | ||
729 | /* | |
730 | * Handle path verification event. | |
731 | */ | |
732 | static void | |
733 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
734 | { | |
735 | struct subchannel *sch; | |
736 | ||
1da177e4 LT |
737 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
738 | cdev->private->flags.doverify = 1; | |
739 | return; | |
740 | } | |
741 | sch = to_subchannel(cdev->dev.parent); | |
742 | /* | |
743 | * Since we might not just be coming from an interrupt from the | |
744 | * subchannel we have to update the schib. | |
745 | */ | |
a8237fc4 | 746 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
747 | |
748 | if (sch->schib.scsw.actl != 0 || | |
65200c29 | 749 | (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) || |
1da177e4 LT |
750 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
751 | /* | |
752 | * No final status yet or final status not yet delivered | |
753 | * to the device driver. Can't do path verfication now, | |
754 | * delay until final status was delivered. | |
755 | */ | |
756 | cdev->private->flags.doverify = 1; | |
757 | return; | |
758 | } | |
759 | /* Device is idle, we can do the path verification. */ | |
760 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 761 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
762 | ccw_device_verify_start(cdev); |
763 | } | |
764 | ||
765 | /* | |
766 | * Got an interrupt for a normal io (state online). | |
767 | */ | |
768 | static void | |
769 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
770 | { | |
771 | struct irb *irb; | |
772 | ||
773 | irb = (struct irb *) __LC_IRB; | |
774 | /* Check for unsolicited interrupt. */ | |
775 | if ((irb->scsw.stctl == | |
776 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
777 | && (!irb->scsw.cc)) { | |
778 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
779 | !irb->esw.esw0.erw.cons) { | |
780 | /* Unit check but no sense data. Need basic sense. */ | |
781 | if (ccw_device_do_sense(cdev, irb) != 0) | |
782 | goto call_handler_unsol; | |
e0ec5749 | 783 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
784 | cdev->private->state = DEV_STATE_W4SENSE; |
785 | cdev->private->intparm = 0; | |
786 | return; | |
787 | } | |
788 | call_handler_unsol: | |
789 | if (cdev->handler) | |
790 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
791 | if (cdev->private->flags.doverify) |
792 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
793 | return; |
794 | } | |
795 | /* Accumulate status and find out if a basic sense is needed. */ | |
796 | ccw_device_accumulate_irb(cdev, irb); | |
797 | if (cdev->private->flags.dosense) { | |
798 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
799 | cdev->private->state = DEV_STATE_W4SENSE; | |
800 | } | |
801 | return; | |
802 | } | |
803 | /* Call the handler. */ | |
804 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
805 | /* Start delayed path verification. */ | |
806 | ccw_device_online_verify(cdev, 0); | |
807 | } | |
808 | ||
809 | /* | |
810 | * Got an timeout in online state. | |
811 | */ | |
812 | static void | |
813 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
814 | { | |
815 | int ret; | |
816 | ||
817 | ccw_device_set_timeout(cdev, 0); | |
818 | ret = ccw_device_cancel_halt_clear(cdev); | |
819 | if (ret == -EBUSY) { | |
820 | ccw_device_set_timeout(cdev, 3*HZ); | |
821 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
822 | return; | |
823 | } | |
3f4cf6e7 CH |
824 | if (ret == -ENODEV) |
825 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
826 | else if (cdev->handler) | |
1da177e4 LT |
827 | cdev->handler(cdev, cdev->private->intparm, |
828 | ERR_PTR(-ETIMEDOUT)); | |
829 | } | |
830 | ||
831 | /* | |
832 | * Got an interrupt for a basic sense. | |
833 | */ | |
2b67fc46 | 834 | static void |
1da177e4 LT |
835 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
836 | { | |
837 | struct irb *irb; | |
838 | ||
839 | irb = (struct irb *) __LC_IRB; | |
840 | /* Check for unsolicited interrupt. */ | |
841 | if (irb->scsw.stctl == | |
842 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
843 | if (irb->scsw.cc == 1) | |
844 | /* Basic sense hasn't started. Try again. */ | |
845 | ccw_device_do_sense(cdev, irb); | |
846 | else { | |
e556bbbd CH |
847 | CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited " |
848 | "interrupt during w4sense...\n", | |
849 | cdev->private->dev_id.ssid, | |
850 | cdev->private->dev_id.devno); | |
1da177e4 LT |
851 | if (cdev->handler) |
852 | cdev->handler (cdev, 0, irb); | |
853 | } | |
854 | return; | |
855 | } | |
3ba1998e CH |
856 | /* |
857 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
858 | * only deliver the halt/clear interrupt to the device driver as if it | |
859 | * had killed the original request. | |
860 | */ | |
861 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
862 | /* Retry Basic Sense if requested. */ |
863 | if (cdev->private->flags.intretry) { | |
864 | cdev->private->flags.intretry = 0; | |
865 | ccw_device_do_sense(cdev, irb); | |
866 | return; | |
867 | } | |
3ba1998e CH |
868 | cdev->private->flags.dosense = 0; |
869 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
870 | ccw_device_accumulate_irb(cdev, irb); | |
871 | goto call_handler; | |
872 | } | |
1da177e4 LT |
873 | /* Add basic sense info to irb. */ |
874 | ccw_device_accumulate_basic_sense(cdev, irb); | |
875 | if (cdev->private->flags.dosense) { | |
876 | /* Another basic sense is needed. */ | |
877 | ccw_device_do_sense(cdev, irb); | |
878 | return; | |
879 | } | |
3ba1998e | 880 | call_handler: |
1da177e4 LT |
881 | cdev->private->state = DEV_STATE_ONLINE; |
882 | /* Call the handler. */ | |
883 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
884 | /* Start delayed path verification. */ | |
885 | ccw_device_online_verify(cdev, 0); | |
886 | } | |
887 | ||
888 | static void | |
889 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
890 | { | |
891 | struct irb *irb; | |
892 | ||
893 | irb = (struct irb *) __LC_IRB; | |
894 | /* Accumulate status. We don't do basic sense. */ | |
895 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
896 | /* Remember to clear irb to avoid residuals. */ |
897 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
898 | /* Try to start delayed device verification. */ |
899 | ccw_device_online_verify(cdev, 0); | |
900 | /* Note: Don't call handler for cio initiated clear! */ | |
901 | } | |
902 | ||
903 | static void | |
904 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
905 | { | |
906 | struct subchannel *sch; | |
907 | ||
908 | sch = to_subchannel(cdev->dev.parent); | |
909 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
910 | /* Start delayed path verification. */ |
911 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 912 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
913 | if (cdev->handler) |
914 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 915 | ERR_PTR(-EIO)); |
1da177e4 LT |
916 | } |
917 | ||
918 | static void | |
919 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
920 | { | |
921 | int ret; | |
922 | ||
923 | ret = ccw_device_cancel_halt_clear(cdev); | |
924 | if (ret == -EBUSY) { | |
925 | ccw_device_set_timeout(cdev, 3*HZ); | |
926 | return; | |
927 | } | |
7c8427c3 CH |
928 | /* Start delayed path verification. */ |
929 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
930 | if (cdev->handler) |
931 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 932 | ERR_PTR(-EIO)); |
1da177e4 LT |
933 | } |
934 | ||
e7769b48 | 935 | void device_kill_io(struct subchannel *sch) |
1da177e4 LT |
936 | { |
937 | int ret; | |
e7769b48 | 938 | struct ccw_device *cdev; |
1da177e4 | 939 | |
e7769b48 | 940 | cdev = sch->dev.driver_data; |
1da177e4 LT |
941 | ret = ccw_device_cancel_halt_clear(cdev); |
942 | if (ret == -EBUSY) { | |
943 | ccw_device_set_timeout(cdev, 3*HZ); | |
944 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
945 | return; | |
946 | } | |
7c8427c3 CH |
947 | /* Start delayed path verification. */ |
948 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
949 | if (cdev->handler) |
950 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 951 | ERR_PTR(-EIO)); |
1da177e4 LT |
952 | } |
953 | ||
954 | static void | |
28bdc6f6 | 955 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 956 | { |
28bdc6f6 | 957 | /* Start verification after current task finished. */ |
7e560814 | 958 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
959 | } |
960 | ||
961 | static void | |
962 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
963 | { | |
964 | struct irb *irb; | |
965 | ||
966 | switch (dev_event) { | |
967 | case DEV_EVENT_INTERRUPT: | |
968 | irb = (struct irb *) __LC_IRB; | |
969 | /* Check for unsolicited interrupt. */ | |
970 | if ((irb->scsw.stctl == | |
971 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && | |
972 | (!irb->scsw.cc)) | |
973 | /* FIXME: we should restart stlck here, but this | |
974 | * is extremely unlikely ... */ | |
975 | goto out_wakeup; | |
976 | ||
977 | ccw_device_accumulate_irb(cdev, irb); | |
978 | /* We don't care about basic sense etc. */ | |
979 | break; | |
980 | default: /* timeout */ | |
981 | break; | |
982 | } | |
983 | out_wakeup: | |
984 | wake_up(&cdev->private->wait_q); | |
985 | } | |
986 | ||
987 | static void | |
988 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
989 | { | |
990 | struct subchannel *sch; | |
991 | ||
992 | sch = to_subchannel(cdev->dev.parent); | |
993 | if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0) | |
994 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
995 | return; | |
996 | ||
997 | /* After 60s the device recognition is considered to have failed. */ | |
998 | ccw_device_set_timeout(cdev, 60*HZ); | |
999 | ||
1000 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1001 | ccw_device_sense_id_start(cdev); | |
1002 | } | |
1003 | ||
1004 | void | |
1005 | device_trigger_reprobe(struct subchannel *sch) | |
1006 | { | |
1007 | struct ccw_device *cdev; | |
1008 | ||
1009 | if (!sch->dev.driver_data) | |
1010 | return; | |
1011 | cdev = sch->dev.driver_data; | |
1012 | if (cdev->private->state != DEV_STATE_DISCONNECTED) | |
1013 | return; | |
1014 | ||
1015 | /* Update some values. */ | |
a8237fc4 | 1016 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 1017 | return; |
7674da77 CH |
1018 | if (!sch->schib.pmcw.dnv) |
1019 | return; | |
1da177e4 LT |
1020 | /* |
1021 | * The pim, pam, pom values may not be accurate, but they are the best | |
1022 | * we have before performing device selection :/ | |
1023 | */ | |
28bdc6f6 | 1024 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
1025 | /* Re-set some bits in the pmcw that were lost. */ |
1026 | sch->schib.pmcw.isc = 3; | |
1027 | sch->schib.pmcw.csense = 1; | |
1028 | sch->schib.pmcw.ena = 0; | |
1029 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1030 | sch->schib.pmcw.mp = 1; | |
1031 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
1032 | /* We should also udate ssd info, but this has to wait. */ | |
d7b5a4c9 CH |
1033 | /* Check if this is another device which appeared on the same sch. */ |
1034 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1035 | PREPARE_WORK(&cdev->private->kick_work, | |
1036 | ccw_device_move_to_orphanage); | |
1037 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1038 | } else | |
1039 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1040 | } |
1041 | ||
1042 | static void | |
1043 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1044 | { | |
1045 | struct subchannel *sch; | |
1046 | ||
1047 | sch = to_subchannel(cdev->dev.parent); | |
1048 | /* | |
1049 | * An interrupt in state offline means a previous disable was not | |
1050 | * successful. Try again. | |
1051 | */ | |
1052 | cio_disable_subchannel(sch); | |
1053 | } | |
1054 | ||
1055 | static void | |
1056 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1057 | { | |
1058 | retry_set_schib(cdev); | |
1059 | cdev->private->state = DEV_STATE_ONLINE; | |
1060 | dev_fsm_event(cdev, dev_event); | |
1061 | } | |
1062 | ||
94bb0633 CH |
1063 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1064 | enum dev_event dev_event) | |
1065 | { | |
1066 | cmf_retry_copy_block(cdev); | |
1067 | cdev->private->state = DEV_STATE_ONLINE; | |
1068 | dev_fsm_event(cdev, dev_event); | |
1069 | } | |
1da177e4 LT |
1070 | |
1071 | static void | |
1072 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1073 | { | |
1074 | ccw_device_set_timeout(cdev, 0); | |
1075 | if (dev_event == DEV_EVENT_NOTOPER) | |
1076 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1077 | else | |
1078 | cdev->private->state = DEV_STATE_OFFLINE; | |
1079 | wake_up(&cdev->private->wait_q); | |
1080 | } | |
1081 | ||
1082 | static void | |
1083 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1084 | { | |
1085 | int ret; | |
1086 | ||
1087 | ret = ccw_device_cancel_halt_clear(cdev); | |
1088 | switch (ret) { | |
1089 | case 0: | |
1090 | cdev->private->state = DEV_STATE_OFFLINE; | |
1091 | wake_up(&cdev->private->wait_q); | |
1092 | break; | |
1093 | case -ENODEV: | |
1094 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1095 | wake_up(&cdev->private->wait_q); | |
1096 | break; | |
1097 | default: | |
1098 | ccw_device_set_timeout(cdev, HZ/10); | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * No operation action. This is used e.g. to ignore a timeout event in | |
1104 | * state offline. | |
1105 | */ | |
1106 | static void | |
1107 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1108 | { | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * Bug operation action. | |
1113 | */ | |
1114 | static void | |
1115 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1116 | { | |
e556bbbd CH |
1117 | CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n", |
1118 | cdev->private->state, dev_event); | |
1da177e4 LT |
1119 | BUG(); |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * device statemachine | |
1124 | */ | |
1125 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1126 | [DEV_STATE_NOT_OPER] = { | |
1127 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1128 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1129 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1130 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1131 | }, | |
1132 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1133 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1134 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1135 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1136 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1137 | }, | |
1138 | [DEV_STATE_SENSE_ID] = { | |
1139 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1140 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1141 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1142 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1143 | }, | |
1144 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1145 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1146 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1147 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1148 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1149 | }, | |
1150 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1151 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1152 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1153 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1154 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1155 | }, |
1156 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1157 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1158 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1159 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1160 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1161 | }, | |
1162 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1163 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1164 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1165 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1166 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1167 | }, | |
1168 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1169 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1170 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1171 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1172 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1173 | }, | |
1174 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1175 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1176 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1177 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1178 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1179 | }, | |
1180 | /* states to wait for i/o completion before doing something */ | |
1181 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1182 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1183 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1184 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1185 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1186 | }, | |
1187 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1188 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1189 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1190 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1191 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1192 | }, | |
1da177e4 LT |
1193 | [DEV_STATE_QUIESCE] = { |
1194 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1195 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1196 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1197 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1198 | }, | |
1199 | /* special states for devices gone not operational */ | |
1200 | [DEV_STATE_DISCONNECTED] = { | |
1201 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1202 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1203 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1204 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1205 | }, |
1206 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1207 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1208 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1209 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1210 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1211 | }, | |
1212 | [DEV_STATE_CMFCHANGE] = { | |
1213 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1214 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1215 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1216 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1217 | }, | |
94bb0633 CH |
1218 | [DEV_STATE_CMFUPDATE] = { |
1219 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1220 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1221 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1222 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1223 | }, | |
1da177e4 LT |
1224 | }; |
1225 | ||
1226 | /* | |
1227 | * io_subchannel_irq is called for "real" interrupts or for status | |
1228 | * pending conditions on msch. | |
1229 | */ | |
1230 | void | |
1231 | io_subchannel_irq (struct device *pdev) | |
1232 | { | |
1233 | struct ccw_device *cdev; | |
1234 | ||
1235 | cdev = to_subchannel(pdev)->dev.driver_data; | |
1236 | ||
1237 | CIO_TRACE_EVENT (3, "IRQ"); | |
1238 | CIO_TRACE_EVENT (3, pdev->bus_id); | |
1239 | if (cdev) | |
1240 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1241 | } | |
1242 | ||
1243 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |