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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> |
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 | ||
d23861ff CH |
62 | void device_set_intretry(struct subchannel *sch) |
63 | { | |
64 | struct ccw_device *cdev; | |
65 | ||
66 | cdev = sch->dev.driver_data; | |
67 | if (!cdev) | |
68 | return; | |
69 | cdev->private->flags.intretry = 1; | |
70 | } | |
71 | ||
24cb5b48 CH |
72 | int device_trigger_verify(struct subchannel *sch) |
73 | { | |
74 | struct ccw_device *cdev; | |
75 | ||
76 | cdev = sch->dev.driver_data; | |
77 | if (!cdev || !cdev->online) | |
78 | return -EINVAL; | |
79 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
80 | return 0; | |
81 | } | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
85 | */ | |
86 | static void | |
87 | ccw_device_timeout(unsigned long data) | |
88 | { | |
89 | struct ccw_device *cdev; | |
90 | ||
91 | cdev = (struct ccw_device *) data; | |
92 | spin_lock_irq(cdev->ccwlock); | |
93 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); | |
94 | spin_unlock_irq(cdev->ccwlock); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Set timeout | |
99 | */ | |
100 | void | |
101 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
102 | { | |
103 | if (expires == 0) { | |
104 | del_timer(&cdev->private->timer); | |
105 | return; | |
106 | } | |
107 | if (timer_pending(&cdev->private->timer)) { | |
108 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
109 | return; | |
110 | } | |
111 | cdev->private->timer.function = ccw_device_timeout; | |
112 | cdev->private->timer.data = (unsigned long) cdev; | |
113 | cdev->private->timer.expires = jiffies + expires; | |
114 | add_timer(&cdev->private->timer); | |
115 | } | |
116 | ||
117 | /* Kill any pending timers after machine check. */ | |
118 | void | |
119 | device_kill_pending_timer(struct subchannel *sch) | |
120 | { | |
121 | struct ccw_device *cdev; | |
122 | ||
123 | if (!sch->dev.driver_data) | |
124 | return; | |
125 | cdev = sch->dev.driver_data; | |
126 | ccw_device_set_timeout(cdev, 0); | |
127 | } | |
128 | ||
129 | /* | |
130 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
131 | * asynchronous operations. We do one try with cio_cancel, two tries | |
132 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
133 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
134 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
135 | * status pending). | |
136 | */ | |
137 | int | |
138 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
139 | { | |
140 | struct subchannel *sch; | |
141 | int ret; | |
142 | ||
143 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 144 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
145 | if (ret || !sch->schib.pmcw.dnv) |
146 | return -ENODEV; | |
147 | if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0) | |
148 | /* Not operational or no activity -> done. */ | |
149 | return 0; | |
150 | /* Stage 1: cancel io. */ | |
151 | if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) && | |
152 | !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
153 | ret = cio_cancel(sch); | |
154 | if (ret != -EINVAL) | |
155 | return ret; | |
156 | /* cancel io unsuccessful. From now on it is asynchronous. */ | |
157 | cdev->private->iretry = 3; /* 3 halt retries. */ | |
158 | } | |
159 | if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
160 | /* Stage 2: halt io. */ | |
161 | if (cdev->private->iretry) { | |
162 | cdev->private->iretry--; | |
163 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
164 | if (ret != -EBUSY) |
165 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
166 | } |
167 | /* halt io unsuccessful. */ | |
168 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
169 | } | |
170 | /* Stage 3: clear io. */ | |
171 | if (cdev->private->iretry) { | |
172 | cdev->private->iretry--; | |
173 | ret = cio_clear (sch); | |
174 | return (ret == 0) ? -EBUSY : ret; | |
175 | } | |
176 | panic("Can't stop i/o on subchannel.\n"); | |
177 | } | |
178 | ||
179 | static int | |
180 | ccw_device_handle_oper(struct ccw_device *cdev) | |
181 | { | |
182 | struct subchannel *sch; | |
183 | ||
184 | sch = to_subchannel(cdev->dev.parent); | |
185 | cdev->private->flags.recog_done = 1; | |
186 | /* | |
187 | * Check if cu type and device type still match. If | |
188 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 189 | * de- and re-register. |
1da177e4 LT |
190 | */ |
191 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
192 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
193 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 194 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 195 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 196 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
197 | queue_work(ccw_device_work, &cdev->private->kick_work); |
198 | return 0; | |
199 | } | |
200 | cdev->private->flags.donotify = 1; | |
201 | return 1; | |
202 | } | |
203 | ||
204 | /* | |
205 | * The machine won't give us any notification by machine check if a chpid has | |
206 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
207 | * the channel subsystem to device selection and updating our path masks). | |
208 | */ | |
209 | static inline void | |
210 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) | |
211 | { | |
212 | int mask, i; | |
213 | ||
214 | for (i = 0; i<8; i++) { | |
215 | mask = 0x80 >> i; | |
216 | if (!(sch->lpm & mask)) | |
217 | continue; | |
218 | if (old_lpm & mask) | |
219 | continue; | |
220 | chpid_is_actually_online(sch->schib.pmcw.chpid[i]); | |
221 | } | |
222 | } | |
223 | ||
224 | /* | |
225 | * Stop device recognition. | |
226 | */ | |
227 | static void | |
228 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
229 | { | |
230 | struct subchannel *sch; | |
231 | int notify, old_lpm, same_dev; | |
232 | ||
233 | sch = to_subchannel(cdev->dev.parent); | |
234 | ||
235 | ccw_device_set_timeout(cdev, 0); | |
236 | cio_disable_subchannel(sch); | |
237 | /* | |
238 | * Now that we tried recognition, we have performed device selection | |
239 | * through ssch() and the path information is up to date. | |
240 | */ | |
241 | old_lpm = sch->lpm; | |
a8237fc4 | 242 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 243 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
244 | /* Check since device may again have become not operational. */ |
245 | if (!sch->schib.pmcw.dnv) | |
246 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
247 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
248 | /* Force reprobe on all chpids. */ | |
249 | old_lpm = 0; | |
250 | if (sch->lpm != old_lpm) | |
251 | __recover_lost_chpids(sch, old_lpm); | |
252 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
253 | if (state == DEV_STATE_NOT_OPER) { | |
254 | cdev->private->flags.recog_done = 1; | |
255 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
256 | return; | |
257 | } | |
258 | /* Boxed devices don't need extra treatment. */ | |
259 | } | |
260 | notify = 0; | |
261 | same_dev = 0; /* Keep the compiler quiet... */ | |
262 | switch (state) { | |
263 | case DEV_STATE_NOT_OPER: | |
264 | CIO_DEBUG(KERN_WARNING, 2, | |
fb6958a5 | 265 | "SenseID : unknown device %04x on subchannel " |
78964268 | 266 | "0.%x.%04x\n", cdev->private->dev_id.devno, |
fb6958a5 | 267 | sch->schid.ssid, sch->schid.sch_no); |
1da177e4 LT |
268 | break; |
269 | case DEV_STATE_OFFLINE: | |
270 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
271 | same_dev = ccw_device_handle_oper(cdev); | |
272 | notify = 1; | |
273 | } | |
274 | /* fill out sense information */ | |
81388d2a | 275 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
276 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
277 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
278 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
279 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
280 | if (notify) { |
281 | cdev->private->state = DEV_STATE_OFFLINE; | |
282 | if (same_dev) { | |
283 | /* Get device online again. */ | |
284 | ccw_device_online(cdev); | |
285 | wake_up(&cdev->private->wait_q); | |
286 | } | |
287 | return; | |
288 | } | |
289 | /* Issue device info message. */ | |
fb6958a5 | 290 | CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: " |
1da177e4 | 291 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " |
fb6958a5 | 292 | "%04X/%02X\n", |
78964268 CH |
293 | cdev->private->dev_id.ssid, |
294 | cdev->private->dev_id.devno, | |
1da177e4 LT |
295 | cdev->id.cu_type, cdev->id.cu_model, |
296 | cdev->id.dev_type, cdev->id.dev_model); | |
297 | break; | |
298 | case DEV_STATE_BOXED: | |
299 | CIO_DEBUG(KERN_WARNING, 2, | |
fb6958a5 | 300 | "SenseID : boxed device %04x on subchannel " |
78964268 | 301 | "0.%x.%04x\n", cdev->private->dev_id.devno, |
fb6958a5 | 302 | sch->schid.ssid, sch->schid.sch_no); |
1da177e4 LT |
303 | break; |
304 | } | |
305 | cdev->private->state = state; | |
306 | io_subchannel_recog_done(cdev); | |
307 | if (state != DEV_STATE_NOT_OPER) | |
308 | wake_up(&cdev->private->wait_q); | |
309 | } | |
310 | ||
311 | /* | |
312 | * Function called from device_id.c after sense id has completed. | |
313 | */ | |
314 | void | |
315 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
316 | { | |
317 | switch (err) { | |
318 | case 0: | |
319 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
320 | break; | |
321 | case -ETIME: /* Sense id stopped by timeout. */ | |
322 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
323 | break; | |
324 | default: | |
325 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
326 | break; | |
327 | } | |
328 | } | |
329 | ||
330 | static void | |
c1637532 | 331 | ccw_device_oper_notify(struct work_struct *work) |
1da177e4 | 332 | { |
c1637532 | 333 | struct ccw_device_private *priv; |
1da177e4 LT |
334 | struct ccw_device *cdev; |
335 | struct subchannel *sch; | |
336 | int ret; | |
337 | ||
c1637532 MS |
338 | priv = container_of(work, struct ccw_device_private, kick_work); |
339 | cdev = priv->cdev; | |
1da177e4 LT |
340 | sch = to_subchannel(cdev->dev.parent); |
341 | ret = (sch->driver && sch->driver->notify) ? | |
342 | sch->driver->notify(&sch->dev, CIO_OPER) : 0; | |
343 | if (!ret) | |
344 | /* Driver doesn't want device back. */ | |
c1637532 | 345 | ccw_device_do_unreg_rereg(work); |
94bb0633 CH |
346 | else { |
347 | /* Reenable channel measurements, if needed. */ | |
348 | cmf_reenable(cdev); | |
1da177e4 | 349 | wake_up(&cdev->private->wait_q); |
94bb0633 | 350 | } |
1da177e4 LT |
351 | } |
352 | ||
353 | /* | |
354 | * Finished with online/offline processing. | |
355 | */ | |
356 | static void | |
357 | ccw_device_done(struct ccw_device *cdev, int state) | |
358 | { | |
359 | struct subchannel *sch; | |
360 | ||
361 | sch = to_subchannel(cdev->dev.parent); | |
362 | ||
f1ee3281 CH |
363 | ccw_device_set_timeout(cdev, 0); |
364 | ||
1da177e4 LT |
365 | if (state != DEV_STATE_ONLINE) |
366 | cio_disable_subchannel(sch); | |
367 | ||
368 | /* Reset device status. */ | |
369 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
370 | ||
371 | cdev->private->state = state; | |
372 | ||
373 | ||
374 | if (state == DEV_STATE_BOXED) | |
375 | CIO_DEBUG(KERN_WARNING, 2, | |
376 | "Boxed device %04x on subchannel %04x\n", | |
78964268 | 377 | cdev->private->dev_id.devno, sch->schid.sch_no); |
1da177e4 LT |
378 | |
379 | if (cdev->private->flags.donotify) { | |
380 | cdev->private->flags.donotify = 0; | |
c1637532 | 381 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify); |
1da177e4 LT |
382 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
383 | } | |
384 | wake_up(&cdev->private->wait_q); | |
385 | ||
386 | if (css_init_done && state != DEV_STATE_ONLINE) | |
387 | put_device (&cdev->dev); | |
388 | } | |
389 | ||
7e560814 CH |
390 | static inline int cmp_pgid(struct pgid *p1, struct pgid *p2) |
391 | { | |
392 | char *c1; | |
393 | char *c2; | |
394 | ||
395 | c1 = (char *)p1; | |
396 | c2 = (char *)p2; | |
397 | ||
398 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
399 | } | |
400 | ||
401 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
402 | { | |
403 | int i; | |
404 | int last; | |
405 | ||
406 | last = 0; | |
407 | for (i = 0; i < 8; i++) { | |
408 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
409 | /* No PGID yet */ | |
410 | continue; | |
411 | if (cdev->private->pgid[last].inf.ps.state1 == | |
412 | SNID_STATE1_RESET) { | |
413 | /* First non-zero PGID */ | |
414 | last = i; | |
415 | continue; | |
416 | } | |
417 | if (cmp_pgid(&cdev->private->pgid[i], | |
418 | &cdev->private->pgid[last]) == 0) | |
419 | /* Non-conflicting PGIDs */ | |
420 | continue; | |
421 | ||
422 | /* PGID mismatch, can't pathgroup. */ | |
423 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
424 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
425 | cdev->private->dev_id.ssid, |
426 | cdev->private->dev_id.devno); | |
7e560814 CH |
427 | cdev->private->options.pgroup = 0; |
428 | return; | |
429 | } | |
430 | if (cdev->private->pgid[last].inf.ps.state1 == | |
431 | SNID_STATE1_RESET) | |
432 | /* No previous pgid found */ | |
433 | memcpy(&cdev->private->pgid[0], &css[0]->global_pgid, | |
434 | sizeof(struct pgid)); | |
435 | else | |
436 | /* Use existing pgid */ | |
437 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
438 | sizeof(struct pgid)); | |
439 | } | |
440 | ||
1da177e4 LT |
441 | /* |
442 | * Function called from device_pgid.c after sense path ground has completed. | |
443 | */ | |
444 | void | |
445 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
446 | { | |
447 | struct subchannel *sch; | |
448 | ||
449 | sch = to_subchannel(cdev->dev.parent); | |
450 | switch (err) { | |
7e560814 CH |
451 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
452 | cdev->private->options.pgroup = 0; | |
453 | break; | |
454 | case 0: /* success */ | |
455 | case -EACCES: /* partial success, some paths not operational */ | |
456 | /* Check if all pgids are equal or 0. */ | |
457 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
458 | break; |
459 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
460 | case -EUSERS: /* device is reserved for someone else. */ | |
461 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 462 | return; |
1da177e4 LT |
463 | default: |
464 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 465 | return; |
1da177e4 | 466 | } |
7e560814 | 467 | /* Start Path Group verification. */ |
7e560814 | 468 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 469 | cdev->private->flags.doverify = 0; |
7e560814 | 470 | ccw_device_verify_start(cdev); |
1da177e4 LT |
471 | } |
472 | ||
473 | /* | |
474 | * Start device recognition. | |
475 | */ | |
476 | int | |
477 | ccw_device_recognition(struct ccw_device *cdev) | |
478 | { | |
479 | struct subchannel *sch; | |
480 | int ret; | |
481 | ||
482 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
483 | (cdev->private->state != DEV_STATE_BOXED)) | |
484 | return -EINVAL; | |
485 | sch = to_subchannel(cdev->dev.parent); | |
486 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
487 | if (ret != 0) | |
488 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
489 | return ret; | |
490 | ||
491 | /* After 60s the device recognition is considered to have failed. */ | |
492 | ccw_device_set_timeout(cdev, 60*HZ); | |
493 | ||
494 | /* | |
495 | * We used to start here with a sense pgid to find out whether a device | |
496 | * is locked by someone else. Unfortunately, the sense pgid command | |
497 | * code has other meanings on devices predating the path grouping | |
498 | * algorithm, so we start with sense id and box the device after an | |
499 | * timeout (or if sense pgid during path verification detects the device | |
500 | * is locked, as may happen on newer devices). | |
501 | */ | |
502 | cdev->private->flags.recog_done = 0; | |
503 | cdev->private->state = DEV_STATE_SENSE_ID; | |
504 | ccw_device_sense_id_start(cdev); | |
505 | return 0; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Handle timeout in device recognition. | |
510 | */ | |
511 | static void | |
512 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
513 | { | |
514 | int ret; | |
515 | ||
516 | ret = ccw_device_cancel_halt_clear(cdev); | |
517 | switch (ret) { | |
518 | case 0: | |
519 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
520 | break; | |
521 | case -ENODEV: | |
522 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
523 | break; | |
524 | default: | |
525 | ccw_device_set_timeout(cdev, 3*HZ); | |
526 | } | |
527 | } | |
528 | ||
529 | ||
530 | static void | |
c1637532 | 531 | ccw_device_nopath_notify(struct work_struct *work) |
1da177e4 | 532 | { |
c1637532 | 533 | struct ccw_device_private *priv; |
1da177e4 LT |
534 | struct ccw_device *cdev; |
535 | struct subchannel *sch; | |
536 | int ret; | |
537 | ||
c1637532 MS |
538 | priv = container_of(work, struct ccw_device_private, kick_work); |
539 | cdev = priv->cdev; | |
1da177e4 LT |
540 | sch = to_subchannel(cdev->dev.parent); |
541 | /* Extra sanity. */ | |
542 | if (sch->lpm) | |
543 | return; | |
544 | ret = (sch->driver && sch->driver->notify) ? | |
545 | sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0; | |
546 | if (!ret) { | |
547 | if (get_device(&sch->dev)) { | |
548 | /* Driver doesn't want to keep device. */ | |
549 | cio_disable_subchannel(sch); | |
550 | if (get_device(&cdev->dev)) { | |
551 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 552 | ccw_device_call_sch_unregister); |
1da177e4 LT |
553 | queue_work(ccw_device_work, |
554 | &cdev->private->kick_work); | |
555 | } else | |
556 | put_device(&sch->dev); | |
557 | } | |
558 | } else { | |
559 | cio_disable_subchannel(sch); | |
560 | ccw_device_set_timeout(cdev, 0); | |
561 | cdev->private->flags.fake_irb = 0; | |
562 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
563 | wake_up(&cdev->private->wait_q); | |
564 | } | |
565 | } | |
566 | ||
567 | void | |
568 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
569 | { | |
28bdc6f6 PO |
570 | struct subchannel *sch; |
571 | ||
572 | sch = to_subchannel(cdev->dev.parent); | |
573 | /* Update schib - pom may have changed. */ | |
574 | stsch(sch->schid, &sch->schib); | |
575 | /* Update lpm with verified path mask. */ | |
576 | sch->lpm = sch->vpm; | |
577 | /* Repeat path verification? */ | |
578 | if (cdev->private->flags.doverify) { | |
579 | cdev->private->flags.doverify = 0; | |
580 | ccw_device_verify_start(cdev); | |
581 | return; | |
582 | } | |
1da177e4 LT |
583 | switch (err) { |
584 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
585 | cdev->private->options.pgroup = 0; | |
586 | case 0: | |
587 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
588 | /* Deliver fake irb to device driver, if needed. */ | |
589 | if (cdev->private->flags.fake_irb) { | |
590 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
292888c8 HC |
591 | cdev->private->irb.scsw.cc = 1; |
592 | cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC; | |
593 | cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND; | |
594 | cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
595 | cdev->private->flags.fake_irb = 0; |
596 | if (cdev->handler) | |
597 | cdev->handler(cdev, cdev->private->intparm, | |
598 | &cdev->private->irb); | |
599 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
600 | } | |
601 | break; | |
602 | case -ETIME: | |
8b42f5c2 PO |
603 | /* Reset oper notify indication after verify error. */ |
604 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
605 | ccw_device_done(cdev, DEV_STATE_BOXED); |
606 | break; | |
607 | default: | |
8b42f5c2 PO |
608 | /* Reset oper notify indication after verify error. */ |
609 | cdev->private->flags.donotify = 0; | |
1da177e4 | 610 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 611 | ccw_device_nopath_notify); |
1da177e4 LT |
612 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
613 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
618 | /* | |
619 | * Get device online. | |
620 | */ | |
621 | int | |
622 | ccw_device_online(struct ccw_device *cdev) | |
623 | { | |
624 | struct subchannel *sch; | |
625 | int ret; | |
626 | ||
627 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
628 | (cdev->private->state != DEV_STATE_BOXED)) | |
629 | return -EINVAL; | |
630 | sch = to_subchannel(cdev->dev.parent); | |
631 | if (css_init_done && !get_device(&cdev->dev)) | |
632 | return -ENODEV; | |
633 | ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc); | |
634 | if (ret != 0) { | |
635 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
636 | if (ret == -ENODEV) | |
637 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
638 | return ret; | |
639 | } | |
640 | /* Do we want to do path grouping? */ | |
641 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
642 | /* Start initial path verification. */ |
643 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 644 | cdev->private->flags.doverify = 0; |
7e560814 | 645 | ccw_device_verify_start(cdev); |
1da177e4 LT |
646 | return 0; |
647 | } | |
648 | /* Do a SensePGID first. */ | |
649 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
650 | ccw_device_sense_pgid_start(cdev); | |
651 | return 0; | |
652 | } | |
653 | ||
654 | void | |
655 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
656 | { | |
657 | switch (err) { | |
658 | case 0: | |
659 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
660 | break; | |
661 | case -ETIME: | |
662 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
663 | break; | |
664 | default: | |
665 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
666 | break; | |
667 | } | |
668 | } | |
669 | ||
670 | /* | |
671 | * Shutdown device. | |
672 | */ | |
673 | int | |
674 | ccw_device_offline(struct ccw_device *cdev) | |
675 | { | |
676 | struct subchannel *sch; | |
677 | ||
d7b5a4c9 CH |
678 | if (ccw_device_is_orphan(cdev)) { |
679 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
680 | return 0; | |
681 | } | |
1da177e4 | 682 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 683 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
684 | return -ENODEV; |
685 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
686 | if (sch->schib.scsw.actl != 0) | |
687 | return -EBUSY; | |
688 | return -EINVAL; | |
689 | } | |
690 | if (sch->schib.scsw.actl != 0) | |
691 | return -EBUSY; | |
692 | /* Are we doing path grouping? */ | |
693 | if (!cdev->private->options.pgroup) { | |
694 | /* No, set state offline immediately. */ | |
695 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
696 | return 0; | |
697 | } | |
698 | /* Start Set Path Group commands. */ | |
699 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
700 | ccw_device_disband_start(cdev); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* | |
705 | * Handle timeout in device online/offline process. | |
706 | */ | |
707 | static void | |
708 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
709 | { | |
710 | int ret; | |
711 | ||
712 | ret = ccw_device_cancel_halt_clear(cdev); | |
713 | switch (ret) { | |
714 | case 0: | |
715 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
716 | break; | |
717 | case -ENODEV: | |
718 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
719 | break; | |
720 | default: | |
721 | ccw_device_set_timeout(cdev, 3*HZ); | |
722 | } | |
723 | } | |
724 | ||
725 | /* | |
726 | * Handle not oper event in device recognition. | |
727 | */ | |
728 | static void | |
729 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
730 | { | |
731 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
732 | } | |
733 | ||
734 | /* | |
735 | * Handle not operational event while offline. | |
736 | */ | |
737 | static void | |
738 | ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
739 | { | |
740 | struct subchannel *sch; | |
741 | ||
742 | cdev->private->state = DEV_STATE_NOT_OPER; | |
743 | sch = to_subchannel(cdev->dev.parent); | |
744 | if (get_device(&cdev->dev)) { | |
745 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 746 | ccw_device_call_sch_unregister); |
1da177e4 LT |
747 | queue_work(ccw_device_work, &cdev->private->kick_work); |
748 | } | |
749 | wake_up(&cdev->private->wait_q); | |
750 | } | |
751 | ||
752 | /* | |
753 | * Handle not operational event while online. | |
754 | */ | |
755 | static void | |
756 | ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
757 | { | |
758 | struct subchannel *sch; | |
759 | ||
760 | sch = to_subchannel(cdev->dev.parent); | |
761 | if (sch->driver->notify && | |
762 | sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) { | |
763 | ccw_device_set_timeout(cdev, 0); | |
764 | cdev->private->flags.fake_irb = 0; | |
765 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
766 | wake_up(&cdev->private->wait_q); | |
767 | return; | |
768 | } | |
769 | cdev->private->state = DEV_STATE_NOT_OPER; | |
770 | cio_disable_subchannel(sch); | |
771 | if (sch->schib.scsw.actl != 0) { | |
772 | // FIXME: not-oper indication to device driver ? | |
773 | ccw_device_call_handler(cdev); | |
774 | } | |
775 | if (get_device(&cdev->dev)) { | |
776 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 777 | ccw_device_call_sch_unregister); |
1da177e4 LT |
778 | queue_work(ccw_device_work, &cdev->private->kick_work); |
779 | } | |
780 | wake_up(&cdev->private->wait_q); | |
781 | } | |
782 | ||
783 | /* | |
784 | * Handle path verification event. | |
785 | */ | |
786 | static void | |
787 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
788 | { | |
789 | struct subchannel *sch; | |
790 | ||
1da177e4 LT |
791 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
792 | cdev->private->flags.doverify = 1; | |
793 | return; | |
794 | } | |
795 | sch = to_subchannel(cdev->dev.parent); | |
796 | /* | |
797 | * Since we might not just be coming from an interrupt from the | |
798 | * subchannel we have to update the schib. | |
799 | */ | |
a8237fc4 | 800 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
801 | |
802 | if (sch->schib.scsw.actl != 0 || | |
65200c29 | 803 | (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) || |
1da177e4 LT |
804 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
805 | /* | |
806 | * No final status yet or final status not yet delivered | |
807 | * to the device driver. Can't do path verfication now, | |
808 | * delay until final status was delivered. | |
809 | */ | |
810 | cdev->private->flags.doverify = 1; | |
811 | return; | |
812 | } | |
813 | /* Device is idle, we can do the path verification. */ | |
814 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 815 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
816 | ccw_device_verify_start(cdev); |
817 | } | |
818 | ||
819 | /* | |
820 | * Got an interrupt for a normal io (state online). | |
821 | */ | |
822 | static void | |
823 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
824 | { | |
825 | struct irb *irb; | |
826 | ||
827 | irb = (struct irb *) __LC_IRB; | |
828 | /* Check for unsolicited interrupt. */ | |
829 | if ((irb->scsw.stctl == | |
830 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
831 | && (!irb->scsw.cc)) { | |
832 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
833 | !irb->esw.esw0.erw.cons) { | |
834 | /* Unit check but no sense data. Need basic sense. */ | |
835 | if (ccw_device_do_sense(cdev, irb) != 0) | |
836 | goto call_handler_unsol; | |
e0ec5749 | 837 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
838 | cdev->private->state = DEV_STATE_W4SENSE; |
839 | cdev->private->intparm = 0; | |
840 | return; | |
841 | } | |
842 | call_handler_unsol: | |
843 | if (cdev->handler) | |
844 | cdev->handler (cdev, 0, irb); | |
845 | return; | |
846 | } | |
847 | /* Accumulate status and find out if a basic sense is needed. */ | |
848 | ccw_device_accumulate_irb(cdev, irb); | |
849 | if (cdev->private->flags.dosense) { | |
850 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
851 | cdev->private->state = DEV_STATE_W4SENSE; | |
852 | } | |
853 | return; | |
854 | } | |
855 | /* Call the handler. */ | |
856 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
857 | /* Start delayed path verification. */ | |
858 | ccw_device_online_verify(cdev, 0); | |
859 | } | |
860 | ||
861 | /* | |
862 | * Got an timeout in online state. | |
863 | */ | |
864 | static void | |
865 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
866 | { | |
867 | int ret; | |
868 | ||
869 | ccw_device_set_timeout(cdev, 0); | |
870 | ret = ccw_device_cancel_halt_clear(cdev); | |
871 | if (ret == -EBUSY) { | |
872 | ccw_device_set_timeout(cdev, 3*HZ); | |
873 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
874 | return; | |
875 | } | |
876 | if (ret == -ENODEV) { | |
877 | struct subchannel *sch; | |
878 | ||
879 | sch = to_subchannel(cdev->dev.parent); | |
880 | if (!sch->lpm) { | |
881 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 882 | ccw_device_nopath_notify); |
1da177e4 LT |
883 | queue_work(ccw_device_notify_work, |
884 | &cdev->private->kick_work); | |
885 | } else | |
886 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
887 | } else if (cdev->handler) | |
888 | cdev->handler(cdev, cdev->private->intparm, | |
889 | ERR_PTR(-ETIMEDOUT)); | |
890 | } | |
891 | ||
892 | /* | |
893 | * Got an interrupt for a basic sense. | |
894 | */ | |
2b67fc46 | 895 | static void |
1da177e4 LT |
896 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
897 | { | |
898 | struct irb *irb; | |
899 | ||
900 | irb = (struct irb *) __LC_IRB; | |
901 | /* Check for unsolicited interrupt. */ | |
902 | if (irb->scsw.stctl == | |
903 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
904 | if (irb->scsw.cc == 1) | |
905 | /* Basic sense hasn't started. Try again. */ | |
906 | ccw_device_do_sense(cdev, irb); | |
907 | else { | |
08983787 CH |
908 | printk(KERN_INFO "Huh? %s(%s): unsolicited " |
909 | "interrupt...\n", | |
1da177e4 LT |
910 | __FUNCTION__, cdev->dev.bus_id); |
911 | if (cdev->handler) | |
912 | cdev->handler (cdev, 0, irb); | |
913 | } | |
914 | return; | |
915 | } | |
3ba1998e CH |
916 | /* |
917 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
918 | * only deliver the halt/clear interrupt to the device driver as if it | |
919 | * had killed the original request. | |
920 | */ | |
921 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
922 | /* Retry Basic Sense if requested. */ |
923 | if (cdev->private->flags.intretry) { | |
924 | cdev->private->flags.intretry = 0; | |
925 | ccw_device_do_sense(cdev, irb); | |
926 | return; | |
927 | } | |
3ba1998e CH |
928 | cdev->private->flags.dosense = 0; |
929 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
930 | ccw_device_accumulate_irb(cdev, irb); | |
931 | goto call_handler; | |
932 | } | |
1da177e4 LT |
933 | /* Add basic sense info to irb. */ |
934 | ccw_device_accumulate_basic_sense(cdev, irb); | |
935 | if (cdev->private->flags.dosense) { | |
936 | /* Another basic sense is needed. */ | |
937 | ccw_device_do_sense(cdev, irb); | |
938 | return; | |
939 | } | |
3ba1998e | 940 | call_handler: |
1da177e4 LT |
941 | cdev->private->state = DEV_STATE_ONLINE; |
942 | /* Call the handler. */ | |
943 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
944 | /* Start delayed path verification. */ | |
945 | ccw_device_online_verify(cdev, 0); | |
946 | } | |
947 | ||
948 | static void | |
949 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
950 | { | |
951 | struct irb *irb; | |
952 | ||
953 | irb = (struct irb *) __LC_IRB; | |
954 | /* Accumulate status. We don't do basic sense. */ | |
955 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
956 | /* Remember to clear irb to avoid residuals. */ |
957 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
958 | /* Try to start delayed device verification. */ |
959 | ccw_device_online_verify(cdev, 0); | |
960 | /* Note: Don't call handler for cio initiated clear! */ | |
961 | } | |
962 | ||
963 | static void | |
964 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
965 | { | |
966 | struct subchannel *sch; | |
967 | ||
968 | sch = to_subchannel(cdev->dev.parent); | |
969 | ccw_device_set_timeout(cdev, 0); | |
970 | /* OK, i/o is dead now. Call interrupt handler. */ | |
971 | cdev->private->state = DEV_STATE_ONLINE; | |
972 | if (cdev->handler) | |
973 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 974 | ERR_PTR(-EIO)); |
1da177e4 LT |
975 | if (!sch->lpm) { |
976 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 977 | ccw_device_nopath_notify); |
1da177e4 LT |
978 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
979 | } else if (cdev->private->flags.doverify) | |
980 | /* Start delayed path verification. */ | |
981 | ccw_device_online_verify(cdev, 0); | |
982 | } | |
983 | ||
984 | static void | |
985 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
986 | { | |
987 | int ret; | |
988 | ||
989 | ret = ccw_device_cancel_halt_clear(cdev); | |
990 | if (ret == -EBUSY) { | |
991 | ccw_device_set_timeout(cdev, 3*HZ); | |
992 | return; | |
993 | } | |
994 | if (ret == -ENODEV) { | |
995 | struct subchannel *sch; | |
996 | ||
997 | sch = to_subchannel(cdev->dev.parent); | |
998 | if (!sch->lpm) { | |
999 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1000 | ccw_device_nopath_notify); |
1da177e4 LT |
1001 | queue_work(ccw_device_notify_work, |
1002 | &cdev->private->kick_work); | |
1003 | } else | |
1004 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
1005 | return; | |
1006 | } | |
1007 | //FIXME: Can we get here? | |
1008 | cdev->private->state = DEV_STATE_ONLINE; | |
1009 | if (cdev->handler) | |
1010 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 1011 | ERR_PTR(-EIO)); |
1da177e4 LT |
1012 | } |
1013 | ||
e7769b48 | 1014 | void device_kill_io(struct subchannel *sch) |
1da177e4 LT |
1015 | { |
1016 | int ret; | |
e7769b48 | 1017 | struct ccw_device *cdev; |
1da177e4 | 1018 | |
e7769b48 | 1019 | cdev = sch->dev.driver_data; |
1da177e4 LT |
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, | |
c1637532 | 1029 | ccw_device_nopath_notify); |
1da177e4 LT |
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, | |
e7769b48 | 1038 | ERR_PTR(-EIO)); |
1da177e4 LT |
1039 | if (!sch->lpm) { |
1040 | PREPARE_WORK(&cdev->private->kick_work, | |
c1637532 | 1041 | ccw_device_nopath_notify); |
1da177e4 | 1042 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
e7769b48 | 1043 | } else |
1da177e4 LT |
1044 | /* Start delayed path verification. */ |
1045 | ccw_device_online_verify(cdev, 0); | |
1046 | } | |
1047 | ||
1048 | static void | |
28bdc6f6 | 1049 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 1050 | { |
28bdc6f6 | 1051 | /* Start verification after current task finished. */ |
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 | 1111 | return; |
7674da77 CH |
1112 | if (!sch->schib.pmcw.dnv) |
1113 | return; | |
1da177e4 LT |
1114 | /* |
1115 | * The pim, pam, pom values may not be accurate, but they are the best | |
1116 | * we have before performing device selection :/ | |
1117 | */ | |
28bdc6f6 | 1118 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 LT |
1119 | /* Re-set some bits in the pmcw that were lost. */ |
1120 | sch->schib.pmcw.isc = 3; | |
1121 | sch->schib.pmcw.csense = 1; | |
1122 | sch->schib.pmcw.ena = 0; | |
1123 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1124 | sch->schib.pmcw.mp = 1; | |
1125 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; | |
1126 | /* We should also udate ssd info, but this has to wait. */ | |
d7b5a4c9 CH |
1127 | /* Check if this is another device which appeared on the same sch. */ |
1128 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1129 | PREPARE_WORK(&cdev->private->kick_work, | |
1130 | ccw_device_move_to_orphanage); | |
1131 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1132 | } else | |
1133 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1134 | } |
1135 | ||
1136 | static void | |
1137 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1138 | { | |
1139 | struct subchannel *sch; | |
1140 | ||
1141 | sch = to_subchannel(cdev->dev.parent); | |
1142 | /* | |
1143 | * An interrupt in state offline means a previous disable was not | |
1144 | * successful. Try again. | |
1145 | */ | |
1146 | cio_disable_subchannel(sch); | |
1147 | } | |
1148 | ||
1149 | static void | |
1150 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1151 | { | |
1152 | retry_set_schib(cdev); | |
1153 | cdev->private->state = DEV_STATE_ONLINE; | |
1154 | dev_fsm_event(cdev, dev_event); | |
1155 | } | |
1156 | ||
94bb0633 CH |
1157 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1158 | enum dev_event dev_event) | |
1159 | { | |
1160 | cmf_retry_copy_block(cdev); | |
1161 | cdev->private->state = DEV_STATE_ONLINE; | |
1162 | dev_fsm_event(cdev, dev_event); | |
1163 | } | |
1da177e4 LT |
1164 | |
1165 | static void | |
1166 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1167 | { | |
1168 | ccw_device_set_timeout(cdev, 0); | |
1169 | if (dev_event == DEV_EVENT_NOTOPER) | |
1170 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1171 | else | |
1172 | cdev->private->state = DEV_STATE_OFFLINE; | |
1173 | wake_up(&cdev->private->wait_q); | |
1174 | } | |
1175 | ||
1176 | static void | |
1177 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1178 | { | |
1179 | int ret; | |
1180 | ||
1181 | ret = ccw_device_cancel_halt_clear(cdev); | |
1182 | switch (ret) { | |
1183 | case 0: | |
1184 | cdev->private->state = DEV_STATE_OFFLINE; | |
1185 | wake_up(&cdev->private->wait_q); | |
1186 | break; | |
1187 | case -ENODEV: | |
1188 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1189 | wake_up(&cdev->private->wait_q); | |
1190 | break; | |
1191 | default: | |
1192 | ccw_device_set_timeout(cdev, HZ/10); | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * No operation action. This is used e.g. to ignore a timeout event in | |
1198 | * state offline. | |
1199 | */ | |
1200 | static void | |
1201 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1202 | { | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Bug operation action. | |
1207 | */ | |
1208 | static void | |
1209 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1210 | { | |
1211 | printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n", | |
1212 | cdev->private->state, dev_event); | |
1213 | BUG(); | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * device statemachine | |
1218 | */ | |
1219 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1220 | [DEV_STATE_NOT_OPER] = { | |
1221 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1222 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1223 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1224 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1225 | }, | |
1226 | [DEV_STATE_SENSE_PGID] = { | |
1227 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1228 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, | |
1229 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1230 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1231 | }, | |
1232 | [DEV_STATE_SENSE_ID] = { | |
1233 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1234 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1235 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1236 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1237 | }, | |
1238 | [DEV_STATE_OFFLINE] = { | |
1239 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1240 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, | |
1241 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1242 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1243 | }, | |
1244 | [DEV_STATE_VERIFY] = { | |
1245 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1246 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, | |
1247 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1248 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1249 | }, |
1250 | [DEV_STATE_ONLINE] = { | |
1251 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1252 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, | |
1253 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1254 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1255 | }, | |
1256 | [DEV_STATE_W4SENSE] = { | |
1257 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1258 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, | |
1259 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1260 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1261 | }, | |
1262 | [DEV_STATE_DISBAND_PGID] = { | |
1263 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1264 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, | |
1265 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1266 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1267 | }, | |
1268 | [DEV_STATE_BOXED] = { | |
1269 | [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper, | |
1270 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, | |
1271 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1272 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1273 | }, | |
1274 | /* states to wait for i/o completion before doing something */ | |
1275 | [DEV_STATE_CLEAR_VERIFY] = { | |
1276 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1277 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, | |
1278 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1279 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1280 | }, | |
1281 | [DEV_STATE_TIMEOUT_KILL] = { | |
1282 | [DEV_EVENT_NOTOPER] = ccw_device_online_notoper, | |
1283 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, | |
1284 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1285 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1286 | }, | |
1da177e4 LT |
1287 | [DEV_STATE_QUIESCE] = { |
1288 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1289 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1290 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1291 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1292 | }, | |
1293 | /* special states for devices gone not operational */ | |
1294 | [DEV_STATE_DISCONNECTED] = { | |
1295 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1296 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1297 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1298 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1299 | }, |
1300 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1301 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1302 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1303 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1304 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1305 | }, | |
1306 | [DEV_STATE_CMFCHANGE] = { | |
1307 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1308 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1309 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1310 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1311 | }, | |
94bb0633 CH |
1312 | [DEV_STATE_CMFUPDATE] = { |
1313 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1314 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1315 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1316 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1317 | }, | |
1da177e4 LT |
1318 | }; |
1319 | ||
1320 | /* | |
1321 | * io_subchannel_irq is called for "real" interrupts or for status | |
1322 | * pending conditions on msch. | |
1323 | */ | |
1324 | void | |
1325 | io_subchannel_irq (struct device *pdev) | |
1326 | { | |
1327 | struct ccw_device *cdev; | |
1328 | ||
1329 | cdev = to_subchannel(pdev)->dev.driver_data; | |
1330 | ||
1331 | CIO_TRACE_EVENT (3, "IRQ"); | |
1332 | CIO_TRACE_EVENT (3, pdev->bus_id); | |
1333 | if (cdev) | |
1334 | dev_fsm_event(cdev, DEV_EVENT_INTERRUPT); | |
1335 | } | |
1336 | ||
1337 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |