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 | |
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> |
1da177e4 LT |
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" | |
1da177e4 LT |
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); | |
a8237fc4 | 135 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
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); | |
ba4ba8a6 PO |
155 | if (ret != -EBUSY) |
156 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
157 | } |
158 | /* halt io unsuccessful. */ | |
159 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
160 | } | |
161 | /* Stage 3: clear io. */ | |
162 | if (cdev->private->iretry) { | |
163 | cdev->private->iretry--; | |
164 | ret = cio_clear (sch); | |
165 | return (ret == 0) ? -EBUSY : ret; | |
166 | } | |
167 | panic("Can't stop i/o on subchannel.\n"); | |
168 | } | |
169 | ||
170 | static int | |
171 | ccw_device_handle_oper(struct ccw_device *cdev) | |
172 | { | |
173 | struct subchannel *sch; | |
174 | ||
175 | sch = to_subchannel(cdev->dev.parent); | |
176 | cdev->private->flags.recog_done = 1; | |
177 | /* | |
178 | * Check if cu type and device type still match. If | |
179 | * not, it is certainly another device and we have to | |
180 | * de- and re-register. Also check here for non-matching devno. | |
181 | */ | |
182 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
183 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
184 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
185 | cdev->id.dev_model != cdev->private->senseid.dev_model || | |
186 | cdev->private->devno != sch->schib.pmcw.dev) { | |
187 | PREPARE_WORK(&cdev->private->kick_work, | |
188 | ccw_device_do_unreg_rereg, (void *)cdev); | |
189 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
190 | return 0; | |
191 | } | |
192 | cdev->private->flags.donotify = 1; | |
193 | return 1; | |
194 | } | |
195 | ||
196 | /* | |
197 | * The machine won't give us any notification by machine check if a chpid has | |
198 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
199 | * the channel subsystem to device selection and updating our path masks). | |
200 | */ | |
201 | static inline void | |
202 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) | |
203 | { | |
204 | int mask, i; | |
205 | ||
206 | for (i = 0; i<8; i++) { | |
207 | mask = 0x80 >> i; | |
208 | if (!(sch->lpm & mask)) | |
209 | continue; | |
210 | if (old_lpm & mask) | |
211 | continue; | |
212 | chpid_is_actually_online(sch->schib.pmcw.chpid[i]); | |
213 | } | |
214 | } | |
215 | ||
216 | /* | |
217 | * Stop device recognition. | |
218 | */ | |
219 | static void | |
220 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
221 | { | |
222 | struct subchannel *sch; | |
223 | int notify, old_lpm, same_dev; | |
224 | ||
225 | sch = to_subchannel(cdev->dev.parent); | |
226 | ||
227 | ccw_device_set_timeout(cdev, 0); | |
228 | cio_disable_subchannel(sch); | |
229 | /* | |
230 | * Now that we tried recognition, we have performed device selection | |
231 | * through ssch() and the path information is up to date. | |
232 | */ | |
233 | old_lpm = sch->lpm; | |
a8237fc4 | 234 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
235 | sch->lpm = sch->schib.pmcw.pim & |
236 | sch->schib.pmcw.pam & | |
237 | sch->schib.pmcw.pom & | |
238 | sch->opm; | |
4ffa9234 CH |
239 | /* Check since device may again have become not operational. */ |
240 | if (!sch->schib.pmcw.dnv) | |
241 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
242 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
243 | /* Force reprobe on all chpids. */ | |
244 | old_lpm = 0; | |
245 | if (sch->lpm != old_lpm) | |
246 | __recover_lost_chpids(sch, old_lpm); | |
247 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
248 | if (state == DEV_STATE_NOT_OPER) { | |
249 | cdev->private->flags.recog_done = 1; | |
250 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
251 | return; | |
252 | } | |
253 | /* Boxed devices don't need extra treatment. */ | |
254 | } | |
255 | notify = 0; | |
256 | same_dev = 0; /* Keep the compiler quiet... */ | |
257 | switch (state) { | |
258 | case DEV_STATE_NOT_OPER: | |
259 | CIO_DEBUG(KERN_WARNING, 2, | |
fb6958a5 CH |
260 | "SenseID : unknown device %04x on subchannel " |
261 | "0.%x.%04x\n", cdev->private->devno, | |
262 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
263 | break; |
264 | case DEV_STATE_OFFLINE: | |
265 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
266 | same_dev = ccw_device_handle_oper(cdev); | |
267 | notify = 1; | |
268 | } | |
269 | /* fill out sense information */ | |
270 | cdev->id = (struct ccw_device_id) { | |
271 | .cu_type = cdev->private->senseid.cu_type, | |
272 | .cu_model = cdev->private->senseid.cu_model, | |
273 | .dev_type = cdev->private->senseid.dev_type, | |
274 | .dev_model = cdev->private->senseid.dev_model, | |
275 | }; | |
276 | if (notify) { | |
277 | cdev->private->state = DEV_STATE_OFFLINE; | |
278 | if (same_dev) { | |
279 | /* Get device online again. */ | |
280 | ccw_device_online(cdev); | |
281 | wake_up(&cdev->private->wait_q); | |
282 | } | |
283 | return; | |
284 | } | |
285 | /* Issue device info message. */ | |
fb6958a5 | 286 | CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: " |
1da177e4 | 287 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " |
fb6958a5 CH |
288 | "%04X/%02X\n", |
289 | cdev->private->ssid, cdev->private->devno, | |
1da177e4 LT |
290 | cdev->id.cu_type, cdev->id.cu_model, |
291 | cdev->id.dev_type, cdev->id.dev_model); | |
292 | break; | |
293 | case DEV_STATE_BOXED: | |
294 | CIO_DEBUG(KERN_WARNING, 2, | |
fb6958a5 CH |
295 | "SenseID : boxed device %04x on subchannel " |
296 | "0.%x.%04x\n", cdev->private->devno, | |
297 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
298 | break; |
299 | } | |
300 | cdev->private->state = state; | |
301 | io_subchannel_recog_done(cdev); | |
302 | if (state != DEV_STATE_NOT_OPER) | |
303 | wake_up(&cdev->private->wait_q); | |
304 | } | |
305 | ||
306 | /* | |
307 | * Function called from device_id.c after sense id has completed. | |
308 | */ | |
309 | void | |
310 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
311 | { | |
312 | switch (err) { | |
313 | case 0: | |
314 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
315 | break; | |
316 | case -ETIME: /* Sense id stopped by timeout. */ | |
317 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
318 | break; | |
319 | default: | |
320 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
325 | static void | |
326 | ccw_device_oper_notify(void *data) | |
327 | { | |
328 | struct ccw_device *cdev; | |
329 | struct subchannel *sch; | |
330 | int ret; | |
331 | ||
332 | cdev = (struct ccw_device *)data; | |
333 | sch = to_subchannel(cdev->dev.parent); | |
334 | ret = (sch->driver && sch->driver->notify) ? | |
335 | sch->driver->notify(&sch->dev, CIO_OPER) : 0; | |
336 | if (!ret) | |
337 | /* Driver doesn't want device back. */ | |
338 | ccw_device_do_unreg_rereg((void *)cdev); | |
94bb0633 CH |
339 | else { |
340 | /* Reenable channel measurements, if needed. */ | |
341 | cmf_reenable(cdev); | |
1da177e4 | 342 | wake_up(&cdev->private->wait_q); |
94bb0633 | 343 | } |
1da177e4 LT |
344 | } |
345 | ||
346 | /* | |
347 | * Finished with online/offline processing. | |
348 | */ | |
349 | static void | |
350 | ccw_device_done(struct ccw_device *cdev, int state) | |
351 | { | |
352 | struct subchannel *sch; | |
353 | ||
354 | sch = to_subchannel(cdev->dev.parent); | |
355 | ||
356 | if (state != DEV_STATE_ONLINE) | |
357 | cio_disable_subchannel(sch); | |
358 | ||
359 | /* Reset device status. */ | |
360 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
361 | ||
362 | cdev->private->state = state; | |
363 | ||
364 | ||
365 | if (state == DEV_STATE_BOXED) | |
366 | CIO_DEBUG(KERN_WARNING, 2, | |
367 | "Boxed device %04x on subchannel %04x\n", | |
a8237fc4 | 368 | cdev->private->devno, sch->schid.sch_no); |
1da177e4 LT |
369 | |
370 | if (cdev->private->flags.donotify) { | |
371 | cdev->private->flags.donotify = 0; | |
372 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify, | |
373 | (void *)cdev); | |
374 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
375 | } | |
376 | wake_up(&cdev->private->wait_q); | |
377 | ||
378 | if (css_init_done && state != DEV_STATE_ONLINE) | |
379 | put_device (&cdev->dev); | |
380 | } | |
381 | ||
7e560814 CH |
382 | static inline int cmp_pgid(struct pgid *p1, struct pgid *p2) |
383 | { | |
384 | char *c1; | |
385 | char *c2; | |
386 | ||
387 | c1 = (char *)p1; | |
388 | c2 = (char *)p2; | |
389 | ||
390 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
391 | } | |
392 | ||
393 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
394 | { | |
395 | int i; | |
396 | int last; | |
397 | ||
398 | last = 0; | |
399 | for (i = 0; i < 8; i++) { | |
400 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
401 | /* No PGID yet */ | |
402 | continue; | |
403 | if (cdev->private->pgid[last].inf.ps.state1 == | |
404 | SNID_STATE1_RESET) { | |
405 | /* First non-zero PGID */ | |
406 | last = i; | |
407 | continue; | |
408 | } | |
409 | if (cmp_pgid(&cdev->private->pgid[i], | |
410 | &cdev->private->pgid[last]) == 0) | |
411 | /* Non-conflicting PGIDs */ | |
412 | continue; | |
413 | ||
414 | /* PGID mismatch, can't pathgroup. */ | |
415 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
416 | "0.%x.%04x, can't pathgroup\n", | |
417 | cdev->private->ssid, cdev->private->devno); | |
418 | cdev->private->options.pgroup = 0; | |
419 | return; | |
420 | } | |
421 | if (cdev->private->pgid[last].inf.ps.state1 == | |
422 | SNID_STATE1_RESET) | |
423 | /* No previous pgid found */ | |
424 | memcpy(&cdev->private->pgid[0], &css[0]->global_pgid, | |
425 | sizeof(struct pgid)); | |
426 | else | |
427 | /* Use existing pgid */ | |
428 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
429 | sizeof(struct pgid)); | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* |
433 | * Function called from device_pgid.c after sense path ground has completed. | |
434 | */ | |
435 | void | |
436 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
437 | { | |
438 | struct subchannel *sch; | |
439 | ||
440 | sch = to_subchannel(cdev->dev.parent); | |
441 | switch (err) { | |
7e560814 CH |
442 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
443 | cdev->private->options.pgroup = 0; | |
444 | break; | |
445 | case 0: /* success */ | |
446 | case -EACCES: /* partial success, some paths not operational */ | |
447 | /* Check if all pgids are equal or 0. */ | |
448 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
449 | break; |
450 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
451 | case -EUSERS: /* device is reserved for someone else. */ | |
452 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 453 | return; |
1da177e4 LT |
454 | default: |
455 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 456 | return; |
1da177e4 | 457 | } |
7e560814 CH |
458 | /* Start Path Group verification. */ |
459 | sch->vpm = 0; /* Start with no path groups set. */ | |
460 | cdev->private->state = DEV_STATE_VERIFY; | |
461 | ccw_device_verify_start(cdev); | |
1da177e4 LT |
462 | } |
463 | ||
464 | /* | |
465 | * Start device recognition. | |
466 | */ | |
467 | int | |
468 | ccw_device_recognition(struct ccw_device *cdev) | |
469 | { | |
470 | struct subchannel *sch; | |
471 | int ret; | |
472 | ||
473 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
474 | (cdev->private->state != DEV_STATE_BOXED)) | |
475 | return -EINVAL; | |
476 | sch = to_subchannel(cdev->dev.parent); | |
477 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
478 | if (ret != 0) | |
479 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
480 | return ret; | |
481 | ||
482 | /* After 60s the device recognition is considered to have failed. */ | |
483 | ccw_device_set_timeout(cdev, 60*HZ); | |
484 | ||
485 | /* | |
486 | * We used to start here with a sense pgid to find out whether a device | |
487 | * is locked by someone else. Unfortunately, the sense pgid command | |
488 | * code has other meanings on devices predating the path grouping | |
489 | * algorithm, so we start with sense id and box the device after an | |
490 | * timeout (or if sense pgid during path verification detects the device | |
491 | * is locked, as may happen on newer devices). | |
492 | */ | |
493 | cdev->private->flags.recog_done = 0; | |
494 | cdev->private->state = DEV_STATE_SENSE_ID; | |
495 | ccw_device_sense_id_start(cdev); | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Handle timeout in device recognition. | |
501 | */ | |
502 | static void | |
503 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
504 | { | |
505 | int ret; | |
506 | ||
507 | ret = ccw_device_cancel_halt_clear(cdev); | |
508 | switch (ret) { | |
509 | case 0: | |
510 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
511 | break; | |
512 | case -ENODEV: | |
513 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
514 | break; | |
515 | default: | |
516 | ccw_device_set_timeout(cdev, 3*HZ); | |
517 | } | |
518 | } | |
519 | ||
520 | ||
521 | static void | |
522 | ccw_device_nopath_notify(void *data) | |
523 | { | |
524 | struct ccw_device *cdev; | |
525 | struct subchannel *sch; | |
526 | int ret; | |
527 | ||
528 | cdev = (struct ccw_device *)data; | |
529 | sch = to_subchannel(cdev->dev.parent); | |
530 | /* Extra sanity. */ | |
531 | if (sch->lpm) | |
532 | return; | |
533 | ret = (sch->driver && sch->driver->notify) ? | |
534 | sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0; | |
535 | if (!ret) { | |
536 | if (get_device(&sch->dev)) { | |
537 | /* Driver doesn't want to keep device. */ | |
538 | cio_disable_subchannel(sch); | |
539 | if (get_device(&cdev->dev)) { | |
540 | PREPARE_WORK(&cdev->private->kick_work, | |
541 | ccw_device_call_sch_unregister, | |
542 | (void *)cdev); | |
543 | queue_work(ccw_device_work, | |
544 | &cdev->private->kick_work); | |
545 | } else | |
546 | put_device(&sch->dev); | |
547 | } | |
548 | } else { | |
549 | cio_disable_subchannel(sch); | |
550 | ccw_device_set_timeout(cdev, 0); | |
551 | cdev->private->flags.fake_irb = 0; | |
552 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
553 | wake_up(&cdev->private->wait_q); | |
554 | } | |
555 | } | |
556 | ||
557 | void | |
558 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
559 | { | |
560 | cdev->private->flags.doverify = 0; | |
561 | switch (err) { | |
562 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
563 | cdev->private->options.pgroup = 0; | |
564 | case 0: | |
565 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
566 | /* Deliver fake irb to device driver, if needed. */ | |
567 | if (cdev->private->flags.fake_irb) { | |
568 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
569 | cdev->private->irb.scsw = (struct scsw) { | |
570 | .cc = 1, | |
571 | .fctl = SCSW_FCTL_START_FUNC, | |
572 | .actl = SCSW_ACTL_START_PEND, | |
573 | .stctl = SCSW_STCTL_STATUS_PEND, | |
574 | }; | |
575 | cdev->private->flags.fake_irb = 0; | |
576 | if (cdev->handler) | |
577 | cdev->handler(cdev, cdev->private->intparm, | |
578 | &cdev->private->irb); | |
579 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
580 | } | |
581 | break; | |
582 | case -ETIME: | |
583 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
584 | break; | |
585 | default: | |
586 | PREPARE_WORK(&cdev->private->kick_work, | |
587 | ccw_device_nopath_notify, (void *)cdev); | |
588 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
589 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
590 | break; | |
591 | } | |
592 | } | |
593 | ||
594 | /* | |
595 | * Get device online. | |
596 | */ | |
597 | int | |
598 | ccw_device_online(struct ccw_device *cdev) | |
599 | { | |
600 | struct subchannel *sch; | |
601 | int ret; | |
602 | ||
603 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
604 | (cdev->private->state != DEV_STATE_BOXED)) | |
605 | return -EINVAL; | |
606 | sch = to_subchannel(cdev->dev.parent); | |
607 | if (css_init_done && !get_device(&cdev->dev)) | |
608 | return -ENODEV; | |
609 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
610 | if (ret != 0) { | |
611 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
612 | if (ret == -ENODEV) | |
613 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
614 | return ret; | |
615 | } | |
616 | /* Do we want to do path grouping? */ | |
617 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
618 | /* Start initial path verification. */ |
619 | cdev->private->state = DEV_STATE_VERIFY; | |
620 | ccw_device_verify_start(cdev); | |
1da177e4 LT |
621 | return 0; |
622 | } | |
623 | /* Do a SensePGID first. */ | |
624 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
625 | ccw_device_sense_pgid_start(cdev); | |
626 | return 0; | |
627 | } | |
628 | ||
629 | void | |
630 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
631 | { | |
632 | switch (err) { | |
633 | case 0: | |
634 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
635 | break; | |
636 | case -ETIME: | |
637 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
638 | break; | |
639 | default: | |
640 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | /* | |
646 | * Shutdown device. | |
647 | */ | |
648 | int | |
649 | ccw_device_offline(struct ccw_device *cdev) | |
650 | { | |
651 | struct subchannel *sch; | |
652 | ||
653 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 654 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
655 | return -ENODEV; |
656 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
657 | if (sch->schib.scsw.actl != 0) | |
658 | return -EBUSY; | |
659 | return -EINVAL; | |
660 | } | |
661 | if (sch->schib.scsw.actl != 0) | |
662 | return -EBUSY; | |
663 | /* Are we doing path grouping? */ | |
664 | if (!cdev->private->options.pgroup) { | |
665 | /* No, set state offline immediately. */ | |
7e560814 | 666 | sch->vpm = 0; |
1da177e4 LT |
667 | ccw_device_done(cdev, DEV_STATE_OFFLINE); |
668 | return 0; | |
669 | } | |
670 | /* Start Set Path Group commands. */ | |
671 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
672 | ccw_device_disband_start(cdev); | |
673 | return 0; | |
674 | } | |
675 | ||
676 | /* | |
677 | * Handle timeout in device online/offline process. | |
678 | */ | |
679 | static void | |
680 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
681 | { | |
682 | int ret; | |
683 | ||
684 | ret = ccw_device_cancel_halt_clear(cdev); | |
685 | switch (ret) { | |
686 | case 0: | |
687 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
688 | break; | |
689 | case -ENODEV: | |
690 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
691 | break; | |
692 | default: | |
693 | ccw_device_set_timeout(cdev, 3*HZ); | |
694 | } | |
695 | } | |
696 | ||
697 | /* | |
698 | * Handle not oper event in device recognition. | |
699 | */ | |
700 | static void | |
701 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
702 | { | |
703 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
704 | } | |
705 | ||
706 | /* | |
707 | * Handle not operational event while offline. | |
708 | */ | |
709 | static void | |
710 | ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
711 | { | |
712 | struct subchannel *sch; | |
713 | ||
714 | cdev->private->state = DEV_STATE_NOT_OPER; | |
715 | sch = to_subchannel(cdev->dev.parent); | |
716 | if (get_device(&cdev->dev)) { | |
717 | PREPARE_WORK(&cdev->private->kick_work, | |
718 | ccw_device_call_sch_unregister, (void *)cdev); | |
719 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
720 | } | |
721 | wake_up(&cdev->private->wait_q); | |
722 | } | |
723 | ||
724 | /* | |
725 | * Handle not operational event while online. | |
726 | */ | |
727 | static void | |
728 | ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
729 | { | |
730 | struct subchannel *sch; | |
731 | ||
732 | sch = to_subchannel(cdev->dev.parent); | |
733 | if (sch->driver->notify && | |
734 | sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) { | |
735 | ccw_device_set_timeout(cdev, 0); | |
736 | cdev->private->flags.fake_irb = 0; | |
737 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
738 | wake_up(&cdev->private->wait_q); | |
739 | return; | |
740 | } | |
741 | cdev->private->state = DEV_STATE_NOT_OPER; | |
742 | cio_disable_subchannel(sch); | |
743 | if (sch->schib.scsw.actl != 0) { | |
744 | // FIXME: not-oper indication to device driver ? | |
745 | ccw_device_call_handler(cdev); | |
746 | } | |
747 | if (get_device(&cdev->dev)) { | |
748 | PREPARE_WORK(&cdev->private->kick_work, | |
749 | ccw_device_call_sch_unregister, (void *)cdev); | |
750 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
751 | } | |
752 | wake_up(&cdev->private->wait_q); | |
753 | } | |
754 | ||
755 | /* | |
756 | * Handle path verification event. | |
757 | */ | |
758 | static void | |
759 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
760 | { | |
761 | struct subchannel *sch; | |
762 | ||
1da177e4 LT |
763 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
764 | cdev->private->flags.doverify = 1; | |
765 | return; | |
766 | } | |
767 | sch = to_subchannel(cdev->dev.parent); | |
768 | /* | |
769 | * Since we might not just be coming from an interrupt from the | |
770 | * subchannel we have to update the schib. | |
771 | */ | |
a8237fc4 | 772 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
773 | |
774 | if (sch->schib.scsw.actl != 0 || | |
65200c29 | 775 | (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) || |
1da177e4 LT |
776 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
777 | /* | |
778 | * No final status yet or final status not yet delivered | |
779 | * to the device driver. Can't do path verfication now, | |
780 | * delay until final status was delivered. | |
781 | */ | |
782 | cdev->private->flags.doverify = 1; | |
783 | return; | |
784 | } | |
785 | /* Device is idle, we can do the path verification. */ | |
786 | cdev->private->state = DEV_STATE_VERIFY; | |
787 | ccw_device_verify_start(cdev); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Got an interrupt for a normal io (state online). | |
792 | */ | |
793 | static void | |
794 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
795 | { | |
796 | struct irb *irb; | |
797 | ||
798 | irb = (struct irb *) __LC_IRB; | |
799 | /* Check for unsolicited interrupt. */ | |
800 | if ((irb->scsw.stctl == | |
801 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
802 | && (!irb->scsw.cc)) { | |
803 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
804 | !irb->esw.esw0.erw.cons) { | |
805 | /* Unit check but no sense data. Need basic sense. */ | |
806 | if (ccw_device_do_sense(cdev, irb) != 0) | |
807 | goto call_handler_unsol; | |
e0ec5749 | 808 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
809 | cdev->private->state = DEV_STATE_W4SENSE; |
810 | cdev->private->intparm = 0; | |
811 | return; | |
812 | } | |
813 | call_handler_unsol: | |
814 | if (cdev->handler) | |
815 | cdev->handler (cdev, 0, irb); | |
816 | return; | |
817 | } | |
818 | /* Accumulate status and find out if a basic sense is needed. */ | |
819 | ccw_device_accumulate_irb(cdev, irb); | |
820 | if (cdev->private->flags.dosense) { | |
821 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
822 | cdev->private->state = DEV_STATE_W4SENSE; | |
823 | } | |
824 | return; | |
825 | } | |
826 | /* Call the handler. */ | |
827 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
828 | /* Start delayed path verification. */ | |
829 | ccw_device_online_verify(cdev, 0); | |
830 | } | |
831 | ||
832 | /* | |
833 | * Got an timeout in online state. | |
834 | */ | |
835 | static void | |
836 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
837 | { | |
838 | int ret; | |
839 | ||
840 | ccw_device_set_timeout(cdev, 0); | |
841 | ret = ccw_device_cancel_halt_clear(cdev); | |
842 | if (ret == -EBUSY) { | |
843 | ccw_device_set_timeout(cdev, 3*HZ); | |
844 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
845 | return; | |
846 | } | |
847 | if (ret == -ENODEV) { | |
848 | struct subchannel *sch; | |
849 | ||
850 | sch = to_subchannel(cdev->dev.parent); | |
851 | if (!sch->lpm) { | |
852 | PREPARE_WORK(&cdev->private->kick_work, | |
853 | ccw_device_nopath_notify, (void *)cdev); | |
854 | queue_work(ccw_device_notify_work, | |
855 | &cdev->private->kick_work); | |
856 | } else | |
857 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
858 | } else if (cdev->handler) | |
859 | cdev->handler(cdev, cdev->private->intparm, | |
860 | ERR_PTR(-ETIMEDOUT)); | |
861 | } | |
862 | ||
863 | /* | |
864 | * Got an interrupt for a basic sense. | |
865 | */ | |
866 | void | |
867 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) | |
868 | { | |
869 | struct irb *irb; | |
870 | ||
871 | irb = (struct irb *) __LC_IRB; | |
872 | /* Check for unsolicited interrupt. */ | |
873 | if (irb->scsw.stctl == | |
874 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
875 | if (irb->scsw.cc == 1) | |
876 | /* Basic sense hasn't started. Try again. */ | |
877 | ccw_device_do_sense(cdev, irb); | |
878 | else { | |
879 | printk("Huh? %s(%s): unsolicited interrupt...\n", | |
880 | __FUNCTION__, cdev->dev.bus_id); | |
881 | if (cdev->handler) | |
882 | cdev->handler (cdev, 0, irb); | |
883 | } | |
884 | return; | |
885 | } | |
3ba1998e CH |
886 | /* |
887 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
888 | * only deliver the halt/clear interrupt to the device driver as if it | |
889 | * had killed the original request. | |
890 | */ | |
891 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
892 | cdev->private->flags.dosense = 0; | |
893 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
894 | ccw_device_accumulate_irb(cdev, irb); | |
895 | goto call_handler; | |
896 | } | |
1da177e4 LT |
897 | /* Add basic sense info to irb. */ |
898 | ccw_device_accumulate_basic_sense(cdev, irb); | |
899 | if (cdev->private->flags.dosense) { | |
900 | /* Another basic sense is needed. */ | |
901 | ccw_device_do_sense(cdev, irb); | |
902 | return; | |
903 | } | |
3ba1998e | 904 | call_handler: |
1da177e4 LT |
905 | cdev->private->state = DEV_STATE_ONLINE; |
906 | /* Call the handler. */ | |
907 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
908 | /* Start delayed path verification. */ | |
909 | ccw_device_online_verify(cdev, 0); | |
910 | } | |
911 | ||
912 | static void | |
913 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
914 | { | |
915 | struct irb *irb; | |
916 | ||
917 | irb = (struct irb *) __LC_IRB; | |
918 | /* Accumulate status. We don't do basic sense. */ | |
919 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
920 | /* Remember to clear irb to avoid residuals. */ |
921 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
922 | /* Try to start delayed device verification. */ |
923 | ccw_device_online_verify(cdev, 0); | |
924 | /* Note: Don't call handler for cio initiated clear! */ | |
925 | } | |
926 | ||
927 | static void | |
928 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
929 | { | |
930 | struct subchannel *sch; | |
931 | ||
932 | sch = to_subchannel(cdev->dev.parent); | |
933 | ccw_device_set_timeout(cdev, 0); | |
934 | /* OK, i/o is dead now. Call interrupt handler. */ | |
935 | cdev->private->state = DEV_STATE_ONLINE; | |
936 | if (cdev->handler) | |
937 | cdev->handler(cdev, cdev->private->intparm, | |
938 | ERR_PTR(-ETIMEDOUT)); | |
939 | if (!sch->lpm) { | |
940 | PREPARE_WORK(&cdev->private->kick_work, | |
941 | ccw_device_nopath_notify, (void *)cdev); | |
942 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
943 | } else if (cdev->private->flags.doverify) | |
944 | /* Start delayed path verification. */ | |
945 | ccw_device_online_verify(cdev, 0); | |
946 | } | |
947 | ||
948 | static void | |
949 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
950 | { | |
951 | int ret; | |
952 | ||
953 | ret = ccw_device_cancel_halt_clear(cdev); | |
954 | if (ret == -EBUSY) { | |
955 | ccw_device_set_timeout(cdev, 3*HZ); | |
956 | return; | |
957 | } | |
958 | if (ret == -ENODEV) { | |
959 | struct subchannel *sch; | |
960 | ||
961 | sch = to_subchannel(cdev->dev.parent); | |
962 | if (!sch->lpm) { | |
963 | PREPARE_WORK(&cdev->private->kick_work, | |
964 | ccw_device_nopath_notify, (void *)cdev); | |
965 | queue_work(ccw_device_notify_work, | |
966 | &cdev->private->kick_work); | |
967 | } else | |
968 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
969 | return; | |
970 | } | |
971 | //FIXME: Can we get here? | |
972 | cdev->private->state = DEV_STATE_ONLINE; | |
973 | if (cdev->handler) | |
974 | cdev->handler(cdev, cdev->private->intparm, | |
975 | ERR_PTR(-ETIMEDOUT)); | |
976 | } | |
977 | ||
978 | static void | |
979 | ccw_device_wait4io_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
980 | { | |
981 | struct irb *irb; | |
982 | struct subchannel *sch; | |
983 | ||
984 | irb = (struct irb *) __LC_IRB; | |
985 | /* | |
986 | * Accumulate status and find out if a basic sense is needed. | |
987 | * This is fine since we have already adapted the lpm. | |
988 | */ | |
989 | ccw_device_accumulate_irb(cdev, irb); | |
990 | if (cdev->private->flags.dosense) { | |
991 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
992 | cdev->private->state = DEV_STATE_W4SENSE; | |
993 | } | |
994 | return; | |
995 | } | |
996 | ||
997 | /* Iff device is idle, reset timeout. */ | |
998 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 999 | if (!stsch(sch->schid, &sch->schib)) |
1da177e4 LT |
1000 | if (sch->schib.scsw.actl == 0) |
1001 | ccw_device_set_timeout(cdev, 0); | |
1002 | /* Call the handler. */ | |
1003 | ccw_device_call_handler(cdev); | |
1004 | if (!sch->lpm) { | |
1005 | PREPARE_WORK(&cdev->private->kick_work, | |
1006 | ccw_device_nopath_notify, (void *)cdev); | |
1007 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
1008 | } else if (cdev->private->flags.doverify) | |
1009 | ccw_device_online_verify(cdev, 0); | |
1010 | } | |
1011 | ||
1012 | static void | |
1013 | ccw_device_wait4io_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1014 | { | |
1015 | int ret; | |
1016 | struct subchannel *sch; | |
1017 | ||
1018 | sch = to_subchannel(cdev->dev.parent); | |
1019 | ccw_device_set_timeout(cdev, 0); | |
1020 | ret = ccw_device_cancel_halt_clear(cdev); | |
1021 | if (ret == -EBUSY) { | |
1022 | ccw_device_set_timeout(cdev, 3*HZ); | |
1023 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
1024 | return; | |
1025 | } | |
1026 | if (ret == -ENODEV) { | |
1027 | if (!sch->lpm) { | |
1028 | PREPARE_WORK(&cdev->private->kick_work, | |
1029 | ccw_device_nopath_notify, (void *)cdev); | |
1030 | queue_work(ccw_device_notify_work, | |
1031 | &cdev->private->kick_work); | |
1032 | } else | |
1033 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1034 | return; | |
1035 | } | |
1036 | if (cdev->handler) | |
1037 | cdev->handler(cdev, cdev->private->intparm, | |
1038 | ERR_PTR(-ETIMEDOUT)); | |
1039 | if (!sch->lpm) { | |
1040 | PREPARE_WORK(&cdev->private->kick_work, | |
1041 | ccw_device_nopath_notify, (void *)cdev); | |
1042 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); | |
1043 | } else if (cdev->private->flags.doverify) | |
1044 | /* Start delayed path verification. */ | |
1045 | ccw_device_online_verify(cdev, 0); | |
1046 | } | |
1047 | ||
1048 | static void | |
1049 | ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
1050 | { | |
1051 | /* When the I/O has terminated, we have to start verification. */ | |
7e560814 | 1052 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
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. */ | |
a8237fc4 | 1110 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 LT |
1111 | return; |
1112 | ||
1113 | /* | |
1114 | * The pim, pam, pom values may not be accurate, but they are the best | |
1115 | * we have before performing device selection :/ | |
1116 | */ | |
1117 | sch->lpm = sch->schib.pmcw.pim & | |
1118 | sch->schib.pmcw.pam & | |
1119 | sch->schib.pmcw.pom & | |
1120 | sch->opm; | |
1121 | /* Re-set some bits in the pmcw that were lost. */ | |
1122 | sch->schib.pmcw.isc = 3; | |
1123 | sch->schib.pmcw.csense = 1; | |
1124 | sch->schib.pmcw.ena = 0; | |
1125 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1126 | sch->schib.pmcw.mp = 1; | |
1127 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
1128 | /* We should also udate ssd info, but this has to wait. */ | |
1129 | ccw_device_start_id(cdev, 0); | |
1130 | } | |
1131 | ||
1132 | static void | |
1133 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1134 | { | |
1135 | struct subchannel *sch; | |
1136 | ||
1137 | sch = to_subchannel(cdev->dev.parent); | |
1138 | /* | |
1139 | * An interrupt in state offline means a previous disable was not | |
1140 | * successful. Try again. | |
1141 | */ | |
1142 | cio_disable_subchannel(sch); | |
1143 | } | |
1144 | ||
1145 | static void | |
1146 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1147 | { | |
1148 | retry_set_schib(cdev); | |
1149 | cdev->private->state = DEV_STATE_ONLINE; | |
1150 | dev_fsm_event(cdev, dev_event); | |
1151 | } | |
1152 | ||
94bb0633 CH |
1153 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1154 | enum dev_event dev_event) | |
1155 | { | |
1156 | cmf_retry_copy_block(cdev); | |
1157 | cdev->private->state = DEV_STATE_ONLINE; | |
1158 | dev_fsm_event(cdev, dev_event); | |
1159 | } | |
1da177e4 LT |
1160 | |
1161 | static void | |
1162 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1163 | { | |
1164 | ccw_device_set_timeout(cdev, 0); | |
1165 | if (dev_event == DEV_EVENT_NOTOPER) | |
1166 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1167 | else | |
1168 | cdev->private->state = DEV_STATE_OFFLINE; | |
1169 | wake_up(&cdev->private->wait_q); | |
1170 | } | |
1171 | ||
1172 | static void | |
1173 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1174 | { | |
1175 | int ret; | |
1176 | ||
1177 | ret = ccw_device_cancel_halt_clear(cdev); | |
1178 | switch (ret) { | |
1179 | case 0: | |
1180 | cdev->private->state = DEV_STATE_OFFLINE; | |
1181 | wake_up(&cdev->private->wait_q); | |
1182 | break; | |
1183 | case -ENODEV: | |
1184 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1185 | wake_up(&cdev->private->wait_q); | |
1186 | break; | |
1187 | default: | |
1188 | ccw_device_set_timeout(cdev, HZ/10); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * No operation action. This is used e.g. to ignore a timeout event in | |
1194 | * state offline. | |
1195 | */ | |
1196 | static void | |
1197 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1198 | { | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Bug operation action. | |
1203 | */ | |
1204 | static void | |
1205 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1206 | { | |
1207 | printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n", | |
1208 | cdev->private->state, dev_event); | |
1209 | BUG(); | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * device statemachine | |
1214 | */ | |
1215 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1216 | [DEV_STATE_NOT_OPER] = { | |
1217 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1218 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1219 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1220 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1221 | }, | |
1222 | [DEV_STATE_SENSE_PGID] = { | |
1223 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1224 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, | |
1225 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1226 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1227 | }, | |
1228 | [DEV_STATE_SENSE_ID] = { | |
1229 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1230 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1231 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1232 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1233 | }, | |
1234 | [DEV_STATE_OFFLINE] = { | |
1235 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1236 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, | |
1237 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1238 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1239 | }, | |
1240 | [DEV_STATE_VERIFY] = { | |
1241 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1242 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, | |
1243 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1244 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1245 | }, | |
1246 | [DEV_STATE_ONLINE] = { | |
1247 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1248 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, | |
1249 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1250 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1251 | }, | |
1252 | [DEV_STATE_W4SENSE] = { | |
1253 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1254 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, | |
1255 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1256 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1257 | }, | |
1258 | [DEV_STATE_DISBAND_PGID] = { | |
1259 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1260 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, | |
1261 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1262 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1263 | }, | |
1264 | [DEV_STATE_BOXED] = { | |
1265 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1266 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, | |
1267 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1268 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1269 | }, | |
1270 | /* states to wait for i/o completion before doing something */ | |
1271 | [DEV_STATE_CLEAR_VERIFY] = { | |
1272 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1273 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, | |
1274 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1275 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1276 | }, | |
1277 | [DEV_STATE_TIMEOUT_KILL] = { | |
1278 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1279 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, | |
1280 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1281 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1282 | }, | |
1283 | [DEV_STATE_WAIT4IO] = { | |
1284 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1285 | [DEV_EVENT_INTERRUPT] = ccw_device_wait4io_irq, | |
1286 | [DEV_EVENT_TIMEOUT] = ccw_device_wait4io_timeout, | |
1287 | [DEV_EVENT_VERIFY] = ccw_device_wait4io_verify, | |
1288 | }, | |
1289 | [DEV_STATE_QUIESCE] = { | |
1290 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1291 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1292 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1293 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1294 | }, | |
1295 | /* special states for devices gone not operational */ | |
1296 | [DEV_STATE_DISCONNECTED] = { | |
1297 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1298 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1299 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
1300 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1301 | }, | |
1302 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1303 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1304 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1305 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1306 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1307 | }, | |
1308 | [DEV_STATE_CMFCHANGE] = { | |
1309 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1310 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1311 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1312 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1313 | }, | |
94bb0633 CH |
1314 | [DEV_STATE_CMFUPDATE] = { |
1315 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1316 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1317 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1318 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1319 | }, | |
1da177e4 LT |
1320 | }; |
1321 | ||
1322 | /* | |
1323 | * io_subchannel_irq is called for "real" interrupts or for status | |
1324 | * pending conditions on msch. | |
1325 | */ | |
1326 | void | |
1327 | io_subchannel_irq (struct device *pdev) | |
1328 | { | |
1329 | struct ccw_device *cdev; | |
1330 | ||
1331 | cdev = to_subchannel(pdev)->dev.driver_data; | |
1332 | ||
1333 | CIO_TRACE_EVENT (3, "IRQ"); | |
1334 | CIO_TRACE_EVENT (3, pdev->bus_id); | |
1335 | if (cdev) | |
1336 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1337 | } | |
1338 | ||
1339 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |