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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device_fsm.c | |
3 | * finite state machine for device handling | |
4 | * | |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
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, | |
fb6958a5 | 271 | "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. */ | |
fb6958a5 | 296 | CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: " |
1da177e4 | 297 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " |
fb6958a5 | 298 | "%04X/%02X\n", |
78964268 CH |
299 | cdev->private->dev_id.ssid, |
300 | cdev->private->dev_id.devno, | |
1da177e4 LT |
301 | cdev->id.cu_type, cdev->id.cu_model, |
302 | cdev->id.dev_type, cdev->id.dev_model); | |
303 | break; | |
304 | case DEV_STATE_BOXED: | |
305 | CIO_DEBUG(KERN_WARNING, 2, | |
fb6958a5 | 306 | "SenseID : boxed device %04x on subchannel " |
78964268 | 307 | "0.%x.%04x\n", cdev->private->dev_id.devno, |
fb6958a5 | 308 | sch->schid.ssid, sch->schid.sch_no); |
1da177e4 LT |
309 | break; |
310 | } | |
311 | cdev->private->state = state; | |
312 | io_subchannel_recog_done(cdev); | |
313 | if (state != DEV_STATE_NOT_OPER) | |
314 | wake_up(&cdev->private->wait_q); | |
315 | } | |
316 | ||
317 | /* | |
318 | * Function called from device_id.c after sense id has completed. | |
319 | */ | |
320 | void | |
321 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
322 | { | |
323 | switch (err) { | |
324 | case 0: | |
325 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
326 | break; | |
327 | case -ETIME: /* Sense id stopped by timeout. */ | |
328 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
329 | break; | |
330 | default: | |
331 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
336 | static void | |
c1637532 | 337 | ccw_device_oper_notify(struct work_struct *work) |
1da177e4 | 338 | { |
c1637532 | 339 | struct ccw_device_private *priv; |
1da177e4 LT |
340 | struct ccw_device *cdev; |
341 | struct subchannel *sch; | |
342 | int ret; | |
ee04bbcc | 343 | unsigned long flags; |
1da177e4 | 344 | |
c1637532 MS |
345 | priv = container_of(work, struct ccw_device_private, kick_work); |
346 | cdev = priv->cdev; | |
ee04bbcc | 347 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 348 | sch = to_subchannel(cdev->dev.parent); |
ee04bbcc CH |
349 | if (sch->driver && sch->driver->notify) { |
350 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
351 | ret = sch->driver->notify(&sch->dev, CIO_OPER); | |
352 | spin_lock_irqsave(cdev->ccwlock, flags); | |
353 | } else | |
354 | ret = 0; | |
355 | if (ret) { | |
94bb0633 | 356 | /* Reenable channel measurements, if needed. */ |
ee04bbcc | 357 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
94bb0633 | 358 | cmf_reenable(cdev); |
ee04bbcc | 359 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 360 | wake_up(&cdev->private->wait_q); |
94bb0633 | 361 | } |
ee04bbcc CH |
362 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
363 | if (!ret) | |
364 | /* Driver doesn't want device back. */ | |
365 | ccw_device_do_unreg_rereg(work); | |
1da177e4 LT |
366 | } |
367 | ||
368 | /* | |
369 | * Finished with online/offline processing. | |
370 | */ | |
371 | static void | |
372 | ccw_device_done(struct ccw_device *cdev, int state) | |
373 | { | |
374 | struct subchannel *sch; | |
375 | ||
376 | sch = to_subchannel(cdev->dev.parent); | |
377 | ||
f1ee3281 CH |
378 | ccw_device_set_timeout(cdev, 0); |
379 | ||
1da177e4 LT |
380 | if (state != DEV_STATE_ONLINE) |
381 | cio_disable_subchannel(sch); | |
382 | ||
383 | /* Reset device status. */ | |
384 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
385 | ||
386 | cdev->private->state = state; | |
387 | ||
388 | ||
389 | if (state == DEV_STATE_BOXED) | |
390 | CIO_DEBUG(KERN_WARNING, 2, | |
391 | "Boxed device %04x on subchannel %04x\n", | |
78964268 | 392 | cdev->private->dev_id.devno, sch->schid.sch_no); |
1da177e4 LT |
393 | |
394 | if (cdev->private->flags.donotify) { | |
395 | cdev->private->flags.donotify = 0; | |
c1637532 | 396 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify); |
1da177e4 LT |
397 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
398 | } | |
399 | wake_up(&cdev->private->wait_q); | |
400 | ||
401 | if (css_init_done && state != DEV_STATE_ONLINE) | |
402 | put_device (&cdev->dev); | |
403 | } | |
404 | ||
4d284cac | 405 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
406 | { |
407 | char *c1; | |
408 | char *c2; | |
409 | ||
410 | c1 = (char *)p1; | |
411 | c2 = (char *)p2; | |
412 | ||
413 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
414 | } | |
415 | ||
416 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
417 | { | |
418 | int i; | |
419 | int last; | |
420 | ||
421 | last = 0; | |
422 | for (i = 0; i < 8; i++) { | |
423 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
424 | /* No PGID yet */ | |
425 | continue; | |
426 | if (cdev->private->pgid[last].inf.ps.state1 == | |
427 | SNID_STATE1_RESET) { | |
428 | /* First non-zero PGID */ | |
429 | last = i; | |
430 | continue; | |
431 | } | |
432 | if (cmp_pgid(&cdev->private->pgid[i], | |
433 | &cdev->private->pgid[last]) == 0) | |
434 | /* Non-conflicting PGIDs */ | |
435 | continue; | |
436 | ||
437 | /* PGID mismatch, can't pathgroup. */ | |
438 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
439 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
440 | cdev->private->dev_id.ssid, |
441 | cdev->private->dev_id.devno); | |
7e560814 CH |
442 | cdev->private->options.pgroup = 0; |
443 | return; | |
444 | } | |
445 | if (cdev->private->pgid[last].inf.ps.state1 == | |
446 | SNID_STATE1_RESET) | |
447 | /* No previous pgid found */ | |
448 | memcpy(&cdev->private->pgid[0], &css[0]->global_pgid, | |
449 | sizeof(struct pgid)); | |
450 | else | |
451 | /* Use existing pgid */ | |
452 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
453 | sizeof(struct pgid)); | |
454 | } | |
455 | ||
1da177e4 LT |
456 | /* |
457 | * Function called from device_pgid.c after sense path ground has completed. | |
458 | */ | |
459 | void | |
460 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
461 | { | |
462 | struct subchannel *sch; | |
463 | ||
464 | sch = to_subchannel(cdev->dev.parent); | |
465 | switch (err) { | |
7e560814 CH |
466 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
467 | cdev->private->options.pgroup = 0; | |
468 | break; | |
469 | case 0: /* success */ | |
470 | case -EACCES: /* partial success, some paths not operational */ | |
471 | /* Check if all pgids are equal or 0. */ | |
472 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
473 | break; |
474 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
475 | case -EUSERS: /* device is reserved for someone else. */ | |
476 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 477 | return; |
1da177e4 LT |
478 | default: |
479 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 480 | return; |
1da177e4 | 481 | } |
7e560814 | 482 | /* Start Path Group verification. */ |
7e560814 | 483 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 484 | cdev->private->flags.doverify = 0; |
7e560814 | 485 | ccw_device_verify_start(cdev); |
1da177e4 LT |
486 | } |
487 | ||
488 | /* | |
489 | * Start device recognition. | |
490 | */ | |
491 | int | |
492 | ccw_device_recognition(struct ccw_device *cdev) | |
493 | { | |
494 | struct subchannel *sch; | |
495 | int ret; | |
496 | ||
497 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
498 | (cdev->private->state != DEV_STATE_BOXED)) | |
499 | return -EINVAL; | |
500 | sch = to_subchannel(cdev->dev.parent); | |
501 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
502 | if (ret != 0) | |
503 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
504 | return ret; | |
505 | ||
506 | /* After 60s the device recognition is considered to have failed. */ | |
507 | ccw_device_set_timeout(cdev, 60*HZ); | |
508 | ||
509 | /* | |
510 | * We used to start here with a sense pgid to find out whether a device | |
511 | * is locked by someone else. Unfortunately, the sense pgid command | |
512 | * code has other meanings on devices predating the path grouping | |
513 | * algorithm, so we start with sense id and box the device after an | |
514 | * timeout (or if sense pgid during path verification detects the device | |
515 | * is locked, as may happen on newer devices). | |
516 | */ | |
517 | cdev->private->flags.recog_done = 0; | |
518 | cdev->private->state = DEV_STATE_SENSE_ID; | |
519 | ccw_device_sense_id_start(cdev); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | /* | |
524 | * Handle timeout in device recognition. | |
525 | */ | |
526 | static void | |
527 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
528 | { | |
529 | int ret; | |
530 | ||
531 | ret = ccw_device_cancel_halt_clear(cdev); | |
532 | switch (ret) { | |
533 | case 0: | |
534 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
535 | break; | |
536 | case -ENODEV: | |
537 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
538 | break; | |
539 | default: | |
540 | ccw_device_set_timeout(cdev, 3*HZ); | |
541 | } | |
542 | } | |
543 | ||
544 | ||
545 | static void | |
c1637532 | 546 | ccw_device_nopath_notify(struct work_struct *work) |
1da177e4 | 547 | { |
c1637532 | 548 | struct ccw_device_private *priv; |
1da177e4 LT |
549 | struct ccw_device *cdev; |
550 | struct subchannel *sch; | |
551 | int ret; | |
ee04bbcc | 552 | unsigned long flags; |
1da177e4 | 553 | |
c1637532 MS |
554 | priv = container_of(work, struct ccw_device_private, kick_work); |
555 | cdev = priv->cdev; | |
ee04bbcc | 556 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 LT |
557 | sch = to_subchannel(cdev->dev.parent); |
558 | /* Extra sanity. */ | |
559 | if (sch->lpm) | |
ee04bbcc CH |
560 | goto out_unlock; |
561 | if (sch->driver && sch->driver->notify) { | |
562 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
563 | ret = sch->driver->notify(&sch->dev, CIO_NO_PATH); | |
564 | spin_lock_irqsave(cdev->ccwlock, flags); | |
565 | } else | |
566 | ret = 0; | |
1da177e4 LT |
567 | if (!ret) { |
568 | if (get_device(&sch->dev)) { | |
569 | /* Driver doesn't want to keep device. */ | |
570 | cio_disable_subchannel(sch); | |
571 | if (get_device(&cdev->dev)) { | |
572 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 573 | ccw_device_call_sch_unregister); |
1da177e4 LT |
574 | queue_work(ccw_device_work, |
575 | &cdev->private->kick_work); | |
576 | } else | |
577 | put_device(&sch->dev); | |
578 | } | |
579 | } else { | |
580 | cio_disable_subchannel(sch); | |
581 | ccw_device_set_timeout(cdev, 0); | |
582 | cdev->private->flags.fake_irb = 0; | |
583 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
584 | wake_up(&cdev->private->wait_q); | |
585 | } | |
ee04bbcc CH |
586 | out_unlock: |
587 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
1da177e4 LT |
588 | } |
589 | ||
590 | void | |
591 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
592 | { | |
28bdc6f6 PO |
593 | struct subchannel *sch; |
594 | ||
595 | sch = to_subchannel(cdev->dev.parent); | |
596 | /* Update schib - pom may have changed. */ | |
597 | stsch(sch->schid, &sch->schib); | |
598 | /* Update lpm with verified path mask. */ | |
599 | sch->lpm = sch->vpm; | |
600 | /* Repeat path verification? */ | |
601 | if (cdev->private->flags.doverify) { | |
602 | cdev->private->flags.doverify = 0; | |
603 | ccw_device_verify_start(cdev); | |
604 | return; | |
605 | } | |
1da177e4 LT |
606 | switch (err) { |
607 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
608 | cdev->private->options.pgroup = 0; | |
609 | case 0: | |
610 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
611 | /* Deliver fake irb to device driver, if needed. */ | |
612 | if (cdev->private->flags.fake_irb) { | |
613 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
292888c8 HC |
614 | cdev->private->irb.scsw.cc = 1; |
615 | cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC; | |
616 | cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND; | |
617 | cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
618 | cdev->private->flags.fake_irb = 0; |
619 | if (cdev->handler) | |
620 | cdev->handler(cdev, cdev->private->intparm, | |
621 | &cdev->private->irb); | |
622 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
623 | } | |
624 | break; | |
625 | case -ETIME: | |
8b42f5c2 PO |
626 | /* Reset oper notify indication after verify error. */ |
627 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
628 | ccw_device_done(cdev, DEV_STATE_BOXED); |
629 | break; | |
630 | default: | |
8b42f5c2 PO |
631 | /* Reset oper notify indication after verify error. */ |
632 | cdev->private->flags.donotify = 0; | |
ee04bbcc CH |
633 | if (cdev->online) { |
634 | PREPARE_WORK(&cdev->private->kick_work, | |
635 | ccw_device_nopath_notify); | |
636 | queue_work(ccw_device_notify_work, | |
637 | &cdev->private->kick_work); | |
638 | } else | |
639 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
1da177e4 LT |
640 | break; |
641 | } | |
642 | } | |
643 | ||
644 | /* | |
645 | * Get device online. | |
646 | */ | |
647 | int | |
648 | ccw_device_online(struct ccw_device *cdev) | |
649 | { | |
650 | struct subchannel *sch; | |
651 | int ret; | |
652 | ||
653 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
654 | (cdev->private->state != DEV_STATE_BOXED)) | |
655 | return -EINVAL; | |
656 | sch = to_subchannel(cdev->dev.parent); | |
657 | if (css_init_done && !get_device(&cdev->dev)) | |
658 | return -ENODEV; | |
659 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
660 | if (ret != 0) { | |
661 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
662 | if (ret == -ENODEV) | |
663 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
664 | return ret; | |
665 | } | |
666 | /* Do we want to do path grouping? */ | |
667 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
668 | /* Start initial path verification. */ |
669 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 670 | cdev->private->flags.doverify = 0; |
7e560814 | 671 | ccw_device_verify_start(cdev); |
1da177e4 LT |
672 | return 0; |
673 | } | |
674 | /* Do a SensePGID first. */ | |
675 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
676 | ccw_device_sense_pgid_start(cdev); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | void | |
681 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
682 | { | |
683 | switch (err) { | |
684 | case 0: | |
685 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
686 | break; | |
687 | case -ETIME: | |
688 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
689 | break; | |
690 | default: | |
691 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
692 | break; | |
693 | } | |
694 | } | |
695 | ||
696 | /* | |
697 | * Shutdown device. | |
698 | */ | |
699 | int | |
700 | ccw_device_offline(struct ccw_device *cdev) | |
701 | { | |
702 | struct subchannel *sch; | |
703 | ||
d7b5a4c9 CH |
704 | if (ccw_device_is_orphan(cdev)) { |
705 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
706 | return 0; | |
707 | } | |
1da177e4 | 708 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 709 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
710 | return -ENODEV; |
711 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
712 | if (sch->schib.scsw.actl != 0) | |
713 | return -EBUSY; | |
714 | return -EINVAL; | |
715 | } | |
716 | if (sch->schib.scsw.actl != 0) | |
717 | return -EBUSY; | |
718 | /* Are we doing path grouping? */ | |
719 | if (!cdev->private->options.pgroup) { | |
720 | /* No, set state offline immediately. */ | |
721 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
722 | return 0; | |
723 | } | |
724 | /* Start Set Path Group commands. */ | |
725 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
726 | ccw_device_disband_start(cdev); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Handle timeout in device online/offline process. | |
732 | */ | |
733 | static void | |
734 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
735 | { | |
736 | int ret; | |
737 | ||
738 | ret = ccw_device_cancel_halt_clear(cdev); | |
739 | switch (ret) { | |
740 | case 0: | |
741 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
742 | break; | |
743 | case -ENODEV: | |
744 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
745 | break; | |
746 | default: | |
747 | ccw_device_set_timeout(cdev, 3*HZ); | |
748 | } | |
749 | } | |
750 | ||
751 | /* | |
752 | * Handle not oper event in device recognition. | |
753 | */ | |
754 | static void | |
755 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
756 | { | |
757 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
758 | } | |
759 | ||
760 | /* | |
761 | * Handle not operational event while offline. | |
762 | */ | |
763 | static void | |
764 | ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
765 | { | |
766 | struct subchannel *sch; | |
767 | ||
768 | cdev->private->state = DEV_STATE_NOT_OPER; | |
769 | sch = to_subchannel(cdev->dev.parent); | |
770 | if (get_device(&cdev->dev)) { | |
771 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 772 | ccw_device_call_sch_unregister); |
1da177e4 LT |
773 | queue_work(ccw_device_work, &cdev->private->kick_work); |
774 | } | |
775 | wake_up(&cdev->private->wait_q); | |
776 | } | |
777 | ||
778 | /* | |
779 | * Handle not operational event while online. | |
780 | */ | |
781 | static void | |
782 | ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
783 | { | |
784 | struct subchannel *sch; | |
ee04bbcc | 785 | int ret; |
1da177e4 LT |
786 | |
787 | sch = to_subchannel(cdev->dev.parent); | |
ee04bbcc CH |
788 | if (sch->driver->notify) { |
789 | spin_unlock_irq(cdev->ccwlock); | |
790 | ret = sch->driver->notify(&sch->dev, | |
791 | sch->lpm ? CIO_GONE : CIO_NO_PATH); | |
792 | spin_lock_irq(cdev->ccwlock); | |
793 | } else | |
794 | ret = 0; | |
795 | if (ret) { | |
796 | ccw_device_set_timeout(cdev, 0); | |
797 | cdev->private->flags.fake_irb = 0; | |
798 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
799 | wake_up(&cdev->private->wait_q); | |
800 | return; | |
1da177e4 LT |
801 | } |
802 | cdev->private->state = DEV_STATE_NOT_OPER; | |
803 | cio_disable_subchannel(sch); | |
804 | if (sch->schib.scsw.actl != 0) { | |
805 | // FIXME: not-oper indication to device driver ? | |
806 | ccw_device_call_handler(cdev); | |
807 | } | |
808 | if (get_device(&cdev->dev)) { | |
809 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 810 | ccw_device_call_sch_unregister); |
1da177e4 LT |
811 | queue_work(ccw_device_work, &cdev->private->kick_work); |
812 | } | |
813 | wake_up(&cdev->private->wait_q); | |
814 | } | |
815 | ||
816 | /* | |
817 | * Handle path verification event. | |
818 | */ | |
819 | static void | |
820 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
821 | { | |
822 | struct subchannel *sch; | |
823 | ||
1da177e4 LT |
824 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
825 | cdev->private->flags.doverify = 1; | |
826 | return; | |
827 | } | |
828 | sch = to_subchannel(cdev->dev.parent); | |
829 | /* | |
830 | * Since we might not just be coming from an interrupt from the | |
831 | * subchannel we have to update the schib. | |
832 | */ | |
a8237fc4 | 833 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
834 | |
835 | if (sch->schib.scsw.actl != 0 || | |
65200c29 | 836 | (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) || |
1da177e4 LT |
837 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
838 | /* | |
839 | * No final status yet or final status not yet delivered | |
840 | * to the device driver. Can't do path verfication now, | |
841 | * delay until final status was delivered. | |
842 | */ | |
843 | cdev->private->flags.doverify = 1; | |
844 | return; | |
845 | } | |
846 | /* Device is idle, we can do the path verification. */ | |
847 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 848 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
849 | ccw_device_verify_start(cdev); |
850 | } | |
851 | ||
852 | /* | |
853 | * Got an interrupt for a normal io (state online). | |
854 | */ | |
855 | static void | |
856 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
857 | { | |
858 | struct irb *irb; | |
859 | ||
860 | irb = (struct irb *) __LC_IRB; | |
861 | /* Check for unsolicited interrupt. */ | |
862 | if ((irb->scsw.stctl == | |
863 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
864 | && (!irb->scsw.cc)) { | |
865 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
866 | !irb->esw.esw0.erw.cons) { | |
867 | /* Unit check but no sense data. Need basic sense. */ | |
868 | if (ccw_device_do_sense(cdev, irb) != 0) | |
869 | goto call_handler_unsol; | |
e0ec5749 | 870 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
871 | cdev->private->state = DEV_STATE_W4SENSE; |
872 | cdev->private->intparm = 0; | |
873 | return; | |
874 | } | |
875 | call_handler_unsol: | |
876 | if (cdev->handler) | |
877 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
878 | if (cdev->private->flags.doverify) |
879 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
880 | return; |
881 | } | |
882 | /* Accumulate status and find out if a basic sense is needed. */ | |
883 | ccw_device_accumulate_irb(cdev, irb); | |
884 | if (cdev->private->flags.dosense) { | |
885 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
886 | cdev->private->state = DEV_STATE_W4SENSE; | |
887 | } | |
888 | return; | |
889 | } | |
890 | /* Call the handler. */ | |
891 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
892 | /* Start delayed path verification. */ | |
893 | ccw_device_online_verify(cdev, 0); | |
894 | } | |
895 | ||
896 | /* | |
897 | * Got an timeout in online state. | |
898 | */ | |
899 | static void | |
900 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
901 | { | |
902 | int ret; | |
903 | ||
904 | ccw_device_set_timeout(cdev, 0); | |
905 | ret = ccw_device_cancel_halt_clear(cdev); | |
906 | if (ret == -EBUSY) { | |
907 | ccw_device_set_timeout(cdev, 3*HZ); | |
908 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
909 | return; | |
910 | } | |
911 | if (ret == -ENODEV) { | |
912 | struct subchannel *sch; | |
913 | ||
914 | sch = to_subchannel(cdev->dev.parent); | |
915 | if (!sch->lpm) { | |
916 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 917 | ccw_device_nopath_notify); |
1da177e4 LT |
918 | queue_work(ccw_device_notify_work, |
919 | &cdev->private->kick_work); | |
920 | } else | |
921 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
922 | } else if (cdev->handler) | |
923 | cdev->handler(cdev, cdev->private->intparm, | |
924 | ERR_PTR(-ETIMEDOUT)); | |
925 | } | |
926 | ||
927 | /* | |
928 | * Got an interrupt for a basic sense. | |
929 | */ | |
2b67fc46 | 930 | static void |
1da177e4 LT |
931 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
932 | { | |
933 | struct irb *irb; | |
934 | ||
935 | irb = (struct irb *) __LC_IRB; | |
936 | /* Check for unsolicited interrupt. */ | |
937 | if (irb->scsw.stctl == | |
938 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
939 | if (irb->scsw.cc == 1) | |
940 | /* Basic sense hasn't started. Try again. */ | |
941 | ccw_device_do_sense(cdev, irb); | |
942 | else { | |
08983787 CH |
943 | printk(KERN_INFO "Huh? %s(%s): unsolicited " |
944 | "interrupt...\n", | |
1da177e4 LT |
945 | __FUNCTION__, cdev->dev.bus_id); |
946 | if (cdev->handler) | |
947 | cdev->handler (cdev, 0, irb); | |
948 | } | |
949 | return; | |
950 | } | |
3ba1998e CH |
951 | /* |
952 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
953 | * only deliver the halt/clear interrupt to the device driver as if it | |
954 | * had killed the original request. | |
955 | */ | |
956 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
957 | /* Retry Basic Sense if requested. */ |
958 | if (cdev->private->flags.intretry) { | |
959 | cdev->private->flags.intretry = 0; | |
960 | ccw_device_do_sense(cdev, irb); | |
961 | return; | |
962 | } | |
3ba1998e CH |
963 | cdev->private->flags.dosense = 0; |
964 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
965 | ccw_device_accumulate_irb(cdev, irb); | |
966 | goto call_handler; | |
967 | } | |
1da177e4 LT |
968 | /* Add basic sense info to irb. */ |
969 | ccw_device_accumulate_basic_sense(cdev, irb); | |
970 | if (cdev->private->flags.dosense) { | |
971 | /* Another basic sense is needed. */ | |
972 | ccw_device_do_sense(cdev, irb); | |
973 | return; | |
974 | } | |
3ba1998e | 975 | call_handler: |
1da177e4 LT |
976 | cdev->private->state = DEV_STATE_ONLINE; |
977 | /* Call the handler. */ | |
978 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
979 | /* Start delayed path verification. */ | |
980 | ccw_device_online_verify(cdev, 0); | |
981 | } | |
982 | ||
983 | static void | |
984 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
985 | { | |
986 | struct irb *irb; | |
987 | ||
988 | irb = (struct irb *) __LC_IRB; | |
989 | /* Accumulate status. We don't do basic sense. */ | |
990 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
991 | /* Remember to clear irb to avoid residuals. */ |
992 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
993 | /* Try to start delayed device verification. */ |
994 | ccw_device_online_verify(cdev, 0); | |
995 | /* Note: Don't call handler for cio initiated clear! */ | |
996 | } | |
997 | ||
998 | static void | |
999 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1000 | { | |
1001 | struct subchannel *sch; | |
1002 | ||
1003 | sch = to_subchannel(cdev->dev.parent); | |
1004 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
1005 | /* Start delayed path verification. */ |
1006 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 1007 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
1008 | if (cdev->handler) |
1009 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 1010 | ERR_PTR(-EIO)); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | static void | |
1014 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1015 | { | |
1016 | int ret; | |
1017 | ||
1018 | ret = ccw_device_cancel_halt_clear(cdev); | |
1019 | if (ret == -EBUSY) { | |
1020 | ccw_device_set_timeout(cdev, 3*HZ); | |
1021 | return; | |
1022 | } | |
7c8427c3 CH |
1023 | /* Start delayed path verification. */ |
1024 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
1025 | if (cdev->handler) |
1026 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 1027 | ERR_PTR(-EIO)); |
1da177e4 LT |
1028 | } |
1029 | ||
e7769b48 | 1030 | void device_kill_io(struct subchannel *sch) |
1da177e4 LT |
1031 | { |
1032 | int ret; | |
e7769b48 | 1033 | struct ccw_device *cdev; |
1da177e4 | 1034 | |
e7769b48 | 1035 | cdev = sch->dev.driver_data; |
1da177e4 LT |
1036 | ret = ccw_device_cancel_halt_clear(cdev); |
1037 | if (ret == -EBUSY) { | |
1038 | ccw_device_set_timeout(cdev, 3*HZ); | |
1039 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
1040 | return; | |
1041 | } | |
7c8427c3 CH |
1042 | /* Start delayed path verification. */ |
1043 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
1044 | if (cdev->handler) |
1045 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 1046 | ERR_PTR(-EIO)); |
1da177e4 LT |
1047 | } |
1048 | ||
1049 | static void | |
28bdc6f6 | 1050 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 1051 | { |
28bdc6f6 | 1052 | /* Start verification after current task finished. */ |
7e560814 | 1053 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | static void | |
1057 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1058 | { | |
1059 | struct irb *irb; | |
1060 | ||
1061 | switch (dev_event) { | |
1062 | case DEV_EVENT_INTERRUPT: | |
1063 | irb = (struct irb *) __LC_IRB; | |
1064 | /* Check for unsolicited interrupt. */ | |
1065 | if ((irb->scsw.stctl == | |
1066 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && | |
1067 | (!irb->scsw.cc)) | |
1068 | /* FIXME: we should restart stlck here, but this | |
1069 | * is extremely unlikely ... */ | |
1070 | goto out_wakeup; | |
1071 | ||
1072 | ccw_device_accumulate_irb(cdev, irb); | |
1073 | /* We don't care about basic sense etc. */ | |
1074 | break; | |
1075 | default: /* timeout */ | |
1076 | break; | |
1077 | } | |
1078 | out_wakeup: | |
1079 | wake_up(&cdev->private->wait_q); | |
1080 | } | |
1081 | ||
1082 | static void | |
1083 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1084 | { | |
1085 | struct subchannel *sch; | |
1086 | ||
1087 | sch = to_subchannel(cdev->dev.parent); | |
1088 | if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0) | |
1089 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
1090 | return; | |
1091 | ||
1092 | /* After 60s the device recognition is considered to have failed. */ | |
1093 | ccw_device_set_timeout(cdev, 60*HZ); | |
1094 | ||
1095 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1096 | ccw_device_sense_id_start(cdev); | |
1097 | } | |
1098 | ||
1099 | void | |
1100 | device_trigger_reprobe(struct subchannel *sch) | |
1101 | { | |
1102 | struct ccw_device *cdev; | |
1103 | ||
1104 | if (!sch->dev.driver_data) | |
1105 | return; | |
1106 | cdev = sch->dev.driver_data; | |
1107 | if (cdev->private->state != DEV_STATE_DISCONNECTED) | |
1108 | return; | |
1109 | ||
1110 | /* Update some values. */ | |
a8237fc4 | 1111 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 1112 | return; |
7674da77 CH |
1113 | if (!sch->schib.pmcw.dnv) |
1114 | return; | |
1da177e4 LT |
1115 | /* |
1116 | * The pim, pam, pom values may not be accurate, but they are the best | |
1117 | * we have before performing device selection :/ | |
1118 | */ | |
28bdc6f6 | 1119 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
1120 | /* Re-set some bits in the pmcw that were lost. */ |
1121 | sch->schib.pmcw.isc = 3; | |
1122 | sch->schib.pmcw.csense = 1; | |
1123 | sch->schib.pmcw.ena = 0; | |
1124 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1125 | sch->schib.pmcw.mp = 1; | |
1126 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
1127 | /* We should also udate ssd info, but this has to wait. */ | |
d7b5a4c9 CH |
1128 | /* Check if this is another device which appeared on the same sch. */ |
1129 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1130 | PREPARE_WORK(&cdev->private->kick_work, | |
1131 | ccw_device_move_to_orphanage); | |
1132 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1133 | } else | |
1134 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1135 | } |
1136 | ||
1137 | static void | |
1138 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1139 | { | |
1140 | struct subchannel *sch; | |
1141 | ||
1142 | sch = to_subchannel(cdev->dev.parent); | |
1143 | /* | |
1144 | * An interrupt in state offline means a previous disable was not | |
1145 | * successful. Try again. | |
1146 | */ | |
1147 | cio_disable_subchannel(sch); | |
1148 | } | |
1149 | ||
1150 | static void | |
1151 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1152 | { | |
1153 | retry_set_schib(cdev); | |
1154 | cdev->private->state = DEV_STATE_ONLINE; | |
1155 | dev_fsm_event(cdev, dev_event); | |
1156 | } | |
1157 | ||
94bb0633 CH |
1158 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1159 | enum dev_event dev_event) | |
1160 | { | |
1161 | cmf_retry_copy_block(cdev); | |
1162 | cdev->private->state = DEV_STATE_ONLINE; | |
1163 | dev_fsm_event(cdev, dev_event); | |
1164 | } | |
1da177e4 LT |
1165 | |
1166 | static void | |
1167 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1168 | { | |
1169 | ccw_device_set_timeout(cdev, 0); | |
1170 | if (dev_event == DEV_EVENT_NOTOPER) | |
1171 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1172 | else | |
1173 | cdev->private->state = DEV_STATE_OFFLINE; | |
1174 | wake_up(&cdev->private->wait_q); | |
1175 | } | |
1176 | ||
1177 | static void | |
1178 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1179 | { | |
1180 | int ret; | |
1181 | ||
1182 | ret = ccw_device_cancel_halt_clear(cdev); | |
1183 | switch (ret) { | |
1184 | case 0: | |
1185 | cdev->private->state = DEV_STATE_OFFLINE; | |
1186 | wake_up(&cdev->private->wait_q); | |
1187 | break; | |
1188 | case -ENODEV: | |
1189 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1190 | wake_up(&cdev->private->wait_q); | |
1191 | break; | |
1192 | default: | |
1193 | ccw_device_set_timeout(cdev, HZ/10); | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * No operation action. This is used e.g. to ignore a timeout event in | |
1199 | * state offline. | |
1200 | */ | |
1201 | static void | |
1202 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1203 | { | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Bug operation action. | |
1208 | */ | |
1209 | static void | |
1210 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1211 | { | |
1212 | printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n", | |
1213 | cdev->private->state, dev_event); | |
1214 | BUG(); | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * device statemachine | |
1219 | */ | |
1220 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1221 | [DEV_STATE_NOT_OPER] = { | |
1222 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1223 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1224 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1225 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1226 | }, | |
1227 | [DEV_STATE_SENSE_PGID] = { | |
1228 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1229 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, | |
1230 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1231 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1232 | }, | |
1233 | [DEV_STATE_SENSE_ID] = { | |
1234 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1235 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1236 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1237 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1238 | }, | |
1239 | [DEV_STATE_OFFLINE] = { | |
1240 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1241 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, | |
1242 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1243 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1244 | }, | |
1245 | [DEV_STATE_VERIFY] = { | |
1246 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1247 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, | |
1248 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1249 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1250 | }, |
1251 | [DEV_STATE_ONLINE] = { | |
1252 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1253 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, | |
1254 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1255 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1256 | }, | |
1257 | [DEV_STATE_W4SENSE] = { | |
1258 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1259 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, | |
1260 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1261 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1262 | }, | |
1263 | [DEV_STATE_DISBAND_PGID] = { | |
1264 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1265 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, | |
1266 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1267 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1268 | }, | |
1269 | [DEV_STATE_BOXED] = { | |
1270 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1271 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, | |
1272 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1273 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1274 | }, | |
1275 | /* states to wait for i/o completion before doing something */ | |
1276 | [DEV_STATE_CLEAR_VERIFY] = { | |
1277 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1278 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, | |
1279 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1280 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1281 | }, | |
1282 | [DEV_STATE_TIMEOUT_KILL] = { | |
1283 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1284 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, | |
1285 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1286 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1287 | }, | |
1da177e4 LT |
1288 | [DEV_STATE_QUIESCE] = { |
1289 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1290 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1291 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1292 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1293 | }, | |
1294 | /* special states for devices gone not operational */ | |
1295 | [DEV_STATE_DISCONNECTED] = { | |
1296 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1297 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1298 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1299 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1300 | }, |
1301 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1302 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1303 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1304 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1305 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1306 | }, | |
1307 | [DEV_STATE_CMFCHANGE] = { | |
1308 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1309 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1310 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1311 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1312 | }, | |
94bb0633 CH |
1313 | [DEV_STATE_CMFUPDATE] = { |
1314 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1315 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1316 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1317 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1318 | }, | |
1da177e4 LT |
1319 | }; |
1320 | ||
1321 | /* | |
1322 | * io_subchannel_irq is called for "real" interrupts or for status | |
1323 | * pending conditions on msch. | |
1324 | */ | |
1325 | void | |
1326 | io_subchannel_irq (struct device *pdev) | |
1327 | { | |
1328 | struct ccw_device *cdev; | |
1329 | ||
1330 | cdev = to_subchannel(pdev)->dev.driver_data; | |
1331 | ||
1332 | CIO_TRACE_EVENT (3, "IRQ"); | |
1333 | CIO_TRACE_EVENT (3, pdev->bus_id); | |
1334 | if (cdev) | |
1335 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1336 | } | |
1337 | ||
1338 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |