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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 | 27 | |
14ff56bb SO |
28 | static int timeout_log_enabled; |
29 | ||
1da177e4 LT |
30 | int |
31 | device_is_online(struct subchannel *sch) | |
32 | { | |
33 | struct ccw_device *cdev; | |
34 | ||
db6a6423 CH |
35 | cdev = sch_get_cdev(sch); |
36 | if (!cdev) | |
1da177e4 | 37 | return 0; |
1da177e4 LT |
38 | return (cdev->private->state == DEV_STATE_ONLINE); |
39 | } | |
40 | ||
41 | int | |
42 | device_is_disconnected(struct subchannel *sch) | |
43 | { | |
44 | struct ccw_device *cdev; | |
45 | ||
db6a6423 CH |
46 | cdev = sch_get_cdev(sch); |
47 | if (!cdev) | |
1da177e4 | 48 | return 0; |
1da177e4 LT |
49 | return (cdev->private->state == DEV_STATE_DISCONNECTED || |
50 | cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID); | |
51 | } | |
52 | ||
53 | void | |
54 | device_set_disconnected(struct subchannel *sch) | |
55 | { | |
56 | struct ccw_device *cdev; | |
57 | ||
db6a6423 CH |
58 | cdev = sch_get_cdev(sch); |
59 | if (!cdev) | |
1da177e4 | 60 | return; |
1da177e4 LT |
61 | ccw_device_set_timeout(cdev, 0); |
62 | cdev->private->flags.fake_irb = 0; | |
63 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
90ab1336 PO |
64 | if (cdev->online) |
65 | ccw_device_schedule_recovery(); | |
1da177e4 LT |
66 | } |
67 | ||
d23861ff CH |
68 | void device_set_intretry(struct subchannel *sch) |
69 | { | |
70 | struct ccw_device *cdev; | |
71 | ||
db6a6423 | 72 | cdev = sch_get_cdev(sch); |
d23861ff CH |
73 | if (!cdev) |
74 | return; | |
75 | cdev->private->flags.intretry = 1; | |
76 | } | |
77 | ||
24cb5b48 CH |
78 | int device_trigger_verify(struct subchannel *sch) |
79 | { | |
80 | struct ccw_device *cdev; | |
81 | ||
db6a6423 | 82 | cdev = sch_get_cdev(sch); |
24cb5b48 CH |
83 | if (!cdev || !cdev->online) |
84 | return -EINVAL; | |
85 | dev_fsm_event(cdev, DEV_EVENT_VERIFY); | |
86 | return 0; | |
87 | } | |
88 | ||
14ff56bb SO |
89 | static int __init ccw_timeout_log_setup(char *unused) |
90 | { | |
91 | timeout_log_enabled = 1; | |
92 | return 1; | |
93 | } | |
94 | ||
95 | __setup("ccw_timeout_log", ccw_timeout_log_setup); | |
96 | ||
97 | static void ccw_timeout_log(struct ccw_device *cdev) | |
98 | { | |
99 | struct schib schib; | |
100 | struct subchannel *sch; | |
cd6b4f27 | 101 | struct io_subchannel_private *private; |
14ff56bb SO |
102 | int cc; |
103 | ||
104 | sch = to_subchannel(cdev->dev.parent); | |
cd6b4f27 | 105 | private = to_io_private(sch); |
14ff56bb SO |
106 | cc = stsch(sch->schid, &schib); |
107 | ||
108 | printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " | |
109 | "device information:\n", get_clock()); | |
110 | printk(KERN_WARNING "cio: orb:\n"); | |
111 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
cd6b4f27 | 112 | &private->orb, sizeof(private->orb), 0); |
14ff56bb SO |
113 | printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id); |
114 | printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id); | |
115 | printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " | |
116 | "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); | |
117 | ||
cd6b4f27 CH |
118 | if ((void *)(addr_t)private->orb.cpa == &private->sense_ccw || |
119 | (void *)(addr_t)private->orb.cpa == cdev->private->iccws) | |
14ff56bb SO |
120 | printk(KERN_WARNING "cio: last channel program (intern):\n"); |
121 | else | |
122 | printk(KERN_WARNING "cio: last channel program:\n"); | |
123 | ||
124 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
cd6b4f27 CH |
125 | (void *)(addr_t)private->orb.cpa, |
126 | sizeof(struct ccw1), 0); | |
14ff56bb SO |
127 | printk(KERN_WARNING "cio: ccw device state: %d\n", |
128 | cdev->private->state); | |
129 | printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); | |
130 | printk(KERN_WARNING "cio: schib:\n"); | |
131 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
132 | &schib, sizeof(schib), 0); | |
133 | printk(KERN_WARNING "cio: ccw device flags:\n"); | |
134 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
135 | &cdev->private->flags, sizeof(cdev->private->flags), 0); | |
136 | } | |
137 | ||
1da177e4 LT |
138 | /* |
139 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
140 | */ | |
141 | static void | |
142 | ccw_device_timeout(unsigned long data) | |
143 | { | |
144 | struct ccw_device *cdev; | |
145 | ||
146 | cdev = (struct ccw_device *) data; | |
147 | spin_lock_irq(cdev->ccwlock); | |
14ff56bb SO |
148 | if (timeout_log_enabled) |
149 | ccw_timeout_log(cdev); | |
1da177e4 LT |
150 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); |
151 | spin_unlock_irq(cdev->ccwlock); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Set timeout | |
156 | */ | |
157 | void | |
158 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
159 | { | |
160 | if (expires == 0) { | |
161 | del_timer(&cdev->private->timer); | |
162 | return; | |
163 | } | |
164 | if (timer_pending(&cdev->private->timer)) { | |
165 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
166 | return; | |
167 | } | |
168 | cdev->private->timer.function = ccw_device_timeout; | |
169 | cdev->private->timer.data = (unsigned long) cdev; | |
170 | cdev->private->timer.expires = jiffies + expires; | |
171 | add_timer(&cdev->private->timer); | |
172 | } | |
173 | ||
174 | /* Kill any pending timers after machine check. */ | |
175 | void | |
176 | device_kill_pending_timer(struct subchannel *sch) | |
177 | { | |
178 | struct ccw_device *cdev; | |
179 | ||
db6a6423 CH |
180 | cdev = sch_get_cdev(sch); |
181 | if (!cdev) | |
1da177e4 | 182 | return; |
1da177e4 LT |
183 | ccw_device_set_timeout(cdev, 0); |
184 | } | |
185 | ||
186 | /* | |
187 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
188 | * asynchronous operations. We do one try with cio_cancel, two tries | |
189 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
190 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
191 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
192 | * status pending). | |
193 | */ | |
194 | int | |
195 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
196 | { | |
197 | struct subchannel *sch; | |
198 | int ret; | |
199 | ||
200 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 201 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
202 | if (ret || !sch->schib.pmcw.dnv) |
203 | return -ENODEV; | |
2470b648 CH |
204 | if (!sch->schib.pmcw.ena) |
205 | /* Not operational -> done. */ | |
1da177e4 LT |
206 | return 0; |
207 | /* Stage 1: cancel io. */ | |
208 | if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) && | |
209 | !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
210 | ret = cio_cancel(sch); | |
211 | if (ret != -EINVAL) | |
212 | return ret; | |
213 | /* cancel io unsuccessful. From now on it is asynchronous. */ | |
214 | cdev->private->iretry = 3; /* 3 halt retries. */ | |
215 | } | |
216 | if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
217 | /* Stage 2: halt io. */ | |
218 | if (cdev->private->iretry) { | |
219 | cdev->private->iretry--; | |
220 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
221 | if (ret != -EBUSY) |
222 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
223 | } |
224 | /* halt io unsuccessful. */ | |
225 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
226 | } | |
227 | /* Stage 3: clear io. */ | |
228 | if (cdev->private->iretry) { | |
229 | cdev->private->iretry--; | |
230 | ret = cio_clear (sch); | |
231 | return (ret == 0) ? -EBUSY : ret; | |
232 | } | |
233 | panic("Can't stop i/o on subchannel.\n"); | |
234 | } | |
235 | ||
236 | static int | |
237 | ccw_device_handle_oper(struct ccw_device *cdev) | |
238 | { | |
239 | struct subchannel *sch; | |
240 | ||
241 | sch = to_subchannel(cdev->dev.parent); | |
242 | cdev->private->flags.recog_done = 1; | |
243 | /* | |
244 | * Check if cu type and device type still match. If | |
245 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 246 | * de- and re-register. |
1da177e4 LT |
247 | */ |
248 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
249 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
250 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 251 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 252 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 253 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
254 | queue_work(ccw_device_work, &cdev->private->kick_work); |
255 | return 0; | |
256 | } | |
257 | cdev->private->flags.donotify = 1; | |
258 | return 1; | |
259 | } | |
260 | ||
261 | /* | |
262 | * The machine won't give us any notification by machine check if a chpid has | |
263 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
264 | * the channel subsystem to device selection and updating our path masks). | |
265 | */ | |
4d284cac | 266 | static void |
1da177e4 LT |
267 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
268 | { | |
269 | int mask, i; | |
f86635fa | 270 | struct chp_id chpid; |
1da177e4 | 271 | |
f86635fa | 272 | chp_id_init(&chpid); |
1da177e4 LT |
273 | for (i = 0; i<8; i++) { |
274 | mask = 0x80 >> i; | |
275 | if (!(sch->lpm & mask)) | |
276 | continue; | |
277 | if (old_lpm & mask) | |
278 | continue; | |
f86635fa | 279 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
280 | if (!chp_is_registered(chpid)) |
281 | css_schedule_eval_all(); | |
1da177e4 LT |
282 | } |
283 | } | |
284 | ||
285 | /* | |
286 | * Stop device recognition. | |
287 | */ | |
288 | static void | |
289 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
290 | { | |
291 | struct subchannel *sch; | |
292 | int notify, old_lpm, same_dev; | |
293 | ||
294 | sch = to_subchannel(cdev->dev.parent); | |
295 | ||
296 | ccw_device_set_timeout(cdev, 0); | |
297 | cio_disable_subchannel(sch); | |
298 | /* | |
299 | * Now that we tried recognition, we have performed device selection | |
300 | * through ssch() and the path information is up to date. | |
301 | */ | |
302 | old_lpm = sch->lpm; | |
a8237fc4 | 303 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 304 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
305 | /* Check since device may again have become not operational. */ |
306 | if (!sch->schib.pmcw.dnv) | |
307 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
308 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
309 | /* Force reprobe on all chpids. */ | |
310 | old_lpm = 0; | |
311 | if (sch->lpm != old_lpm) | |
312 | __recover_lost_chpids(sch, old_lpm); | |
313 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
314 | if (state == DEV_STATE_NOT_OPER) { | |
315 | cdev->private->flags.recog_done = 1; | |
316 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
317 | return; | |
318 | } | |
319 | /* Boxed devices don't need extra treatment. */ | |
320 | } | |
321 | notify = 0; | |
322 | same_dev = 0; /* Keep the compiler quiet... */ | |
323 | switch (state) { | |
324 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
325 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
326 | "subchannel 0.%x.%04x\n", | |
327 | cdev->private->dev_id.devno, | |
328 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
329 | break; |
330 | case DEV_STATE_OFFLINE: | |
331 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
332 | same_dev = ccw_device_handle_oper(cdev); | |
333 | notify = 1; | |
334 | } | |
335 | /* fill out sense information */ | |
81388d2a | 336 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
337 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
338 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
339 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
340 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
341 | if (notify) { |
342 | cdev->private->state = DEV_STATE_OFFLINE; | |
343 | if (same_dev) { | |
344 | /* Get device online again. */ | |
345 | ccw_device_online(cdev); | |
346 | wake_up(&cdev->private->wait_q); | |
347 | } | |
348 | return; | |
349 | } | |
350 | /* Issue device info message. */ | |
139b83dd ME |
351 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " |
352 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
353 | "%04X/%02X\n", | |
354 | cdev->private->dev_id.ssid, | |
355 | cdev->private->dev_id.devno, | |
356 | cdev->id.cu_type, cdev->id.cu_model, | |
357 | cdev->id.dev_type, cdev->id.dev_model); | |
1da177e4 LT |
358 | break; |
359 | case DEV_STATE_BOXED: | |
139b83dd ME |
360 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
361 | " subchannel 0.%x.%04x\n", | |
362 | cdev->private->dev_id.devno, | |
363 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
364 | break; |
365 | } | |
366 | cdev->private->state = state; | |
367 | io_subchannel_recog_done(cdev); | |
368 | if (state != DEV_STATE_NOT_OPER) | |
369 | wake_up(&cdev->private->wait_q); | |
370 | } | |
371 | ||
372 | /* | |
373 | * Function called from device_id.c after sense id has completed. | |
374 | */ | |
375 | void | |
376 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
377 | { | |
378 | switch (err) { | |
379 | case 0: | |
380 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
381 | break; | |
382 | case -ETIME: /* Sense id stopped by timeout. */ | |
383 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
384 | break; | |
385 | default: | |
386 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
387 | break; | |
388 | } | |
389 | } | |
390 | ||
391 | static void | |
c1637532 | 392 | ccw_device_oper_notify(struct work_struct *work) |
1da177e4 | 393 | { |
c1637532 | 394 | struct ccw_device_private *priv; |
1da177e4 LT |
395 | struct ccw_device *cdev; |
396 | struct subchannel *sch; | |
397 | int ret; | |
ee04bbcc | 398 | unsigned long flags; |
1da177e4 | 399 | |
c1637532 MS |
400 | priv = container_of(work, struct ccw_device_private, kick_work); |
401 | cdev = priv->cdev; | |
ee04bbcc | 402 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 403 | sch = to_subchannel(cdev->dev.parent); |
ee04bbcc CH |
404 | if (sch->driver && sch->driver->notify) { |
405 | spin_unlock_irqrestore(cdev->ccwlock, flags); | |
602b20f2 | 406 | ret = sch->driver->notify(sch, CIO_OPER); |
ee04bbcc CH |
407 | spin_lock_irqsave(cdev->ccwlock, flags); |
408 | } else | |
409 | ret = 0; | |
410 | if (ret) { | |
94bb0633 | 411 | /* Reenable channel measurements, if needed. */ |
ee04bbcc | 412 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
94bb0633 | 413 | cmf_reenable(cdev); |
ee04bbcc | 414 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 415 | wake_up(&cdev->private->wait_q); |
94bb0633 | 416 | } |
ee04bbcc CH |
417 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
418 | if (!ret) | |
419 | /* Driver doesn't want device back. */ | |
420 | ccw_device_do_unreg_rereg(work); | |
1da177e4 LT |
421 | } |
422 | ||
423 | /* | |
424 | * Finished with online/offline processing. | |
425 | */ | |
426 | static void | |
427 | ccw_device_done(struct ccw_device *cdev, int state) | |
428 | { | |
429 | struct subchannel *sch; | |
430 | ||
431 | sch = to_subchannel(cdev->dev.parent); | |
432 | ||
f1ee3281 CH |
433 | ccw_device_set_timeout(cdev, 0); |
434 | ||
1da177e4 LT |
435 | if (state != DEV_STATE_ONLINE) |
436 | cio_disable_subchannel(sch); | |
437 | ||
438 | /* Reset device status. */ | |
439 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
440 | ||
441 | cdev->private->state = state; | |
442 | ||
443 | ||
444 | if (state == DEV_STATE_BOXED) | |
139b83dd ME |
445 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
446 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
1da177e4 LT |
447 | |
448 | if (cdev->private->flags.donotify) { | |
449 | cdev->private->flags.donotify = 0; | |
c1637532 | 450 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify); |
1da177e4 LT |
451 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
452 | } | |
453 | wake_up(&cdev->private->wait_q); | |
454 | ||
455 | if (css_init_done && state != DEV_STATE_ONLINE) | |
456 | put_device (&cdev->dev); | |
457 | } | |
458 | ||
4d284cac | 459 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
460 | { |
461 | char *c1; | |
462 | char *c2; | |
463 | ||
464 | c1 = (char *)p1; | |
465 | c2 = (char *)p2; | |
466 | ||
467 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
468 | } | |
469 | ||
470 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
471 | { | |
472 | int i; | |
473 | int last; | |
474 | ||
475 | last = 0; | |
476 | for (i = 0; i < 8; i++) { | |
477 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
478 | /* No PGID yet */ | |
479 | continue; | |
480 | if (cdev->private->pgid[last].inf.ps.state1 == | |
481 | SNID_STATE1_RESET) { | |
482 | /* First non-zero PGID */ | |
483 | last = i; | |
484 | continue; | |
485 | } | |
486 | if (cmp_pgid(&cdev->private->pgid[i], | |
487 | &cdev->private->pgid[last]) == 0) | |
488 | /* Non-conflicting PGIDs */ | |
489 | continue; | |
490 | ||
491 | /* PGID mismatch, can't pathgroup. */ | |
492 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
493 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
494 | cdev->private->dev_id.ssid, |
495 | cdev->private->dev_id.devno); | |
7e560814 CH |
496 | cdev->private->options.pgroup = 0; |
497 | return; | |
498 | } | |
499 | if (cdev->private->pgid[last].inf.ps.state1 == | |
500 | SNID_STATE1_RESET) | |
501 | /* No previous pgid found */ | |
7c9f4e3a CH |
502 | memcpy(&cdev->private->pgid[0], |
503 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
504 | sizeof(struct pgid)); |
505 | else | |
506 | /* Use existing pgid */ | |
507 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
508 | sizeof(struct pgid)); | |
509 | } | |
510 | ||
1da177e4 LT |
511 | /* |
512 | * Function called from device_pgid.c after sense path ground has completed. | |
513 | */ | |
514 | void | |
515 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
516 | { | |
517 | struct subchannel *sch; | |
518 | ||
519 | sch = to_subchannel(cdev->dev.parent); | |
520 | switch (err) { | |
7e560814 CH |
521 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
522 | cdev->private->options.pgroup = 0; | |
523 | break; | |
524 | case 0: /* success */ | |
525 | case -EACCES: /* partial success, some paths not operational */ | |
526 | /* Check if all pgids are equal or 0. */ | |
527 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
528 | break; |
529 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
530 | case -EUSERS: /* device is reserved for someone else. */ | |
531 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 532 | return; |
1da177e4 LT |
533 | default: |
534 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 535 | return; |
1da177e4 | 536 | } |
7e560814 | 537 | /* Start Path Group verification. */ |
7e560814 | 538 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 539 | cdev->private->flags.doverify = 0; |
7e560814 | 540 | ccw_device_verify_start(cdev); |
1da177e4 LT |
541 | } |
542 | ||
543 | /* | |
544 | * Start device recognition. | |
545 | */ | |
546 | int | |
547 | ccw_device_recognition(struct ccw_device *cdev) | |
548 | { | |
549 | struct subchannel *sch; | |
550 | int ret; | |
551 | ||
552 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
553 | (cdev->private->state != DEV_STATE_BOXED)) | |
554 | return -EINVAL; | |
555 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 556 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
557 | if (ret != 0) |
558 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
559 | return ret; | |
560 | ||
561 | /* After 60s the device recognition is considered to have failed. */ | |
562 | ccw_device_set_timeout(cdev, 60*HZ); | |
563 | ||
564 | /* | |
565 | * We used to start here with a sense pgid to find out whether a device | |
566 | * is locked by someone else. Unfortunately, the sense pgid command | |
567 | * code has other meanings on devices predating the path grouping | |
568 | * algorithm, so we start with sense id and box the device after an | |
569 | * timeout (or if sense pgid during path verification detects the device | |
570 | * is locked, as may happen on newer devices). | |
571 | */ | |
572 | cdev->private->flags.recog_done = 0; | |
573 | cdev->private->state = DEV_STATE_SENSE_ID; | |
574 | ccw_device_sense_id_start(cdev); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Handle timeout in device recognition. | |
580 | */ | |
581 | static void | |
582 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
583 | { | |
584 | int ret; | |
585 | ||
586 | ret = ccw_device_cancel_halt_clear(cdev); | |
587 | switch (ret) { | |
588 | case 0: | |
589 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
590 | break; | |
591 | case -ENODEV: | |
592 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
593 | break; | |
594 | default: | |
595 | ccw_device_set_timeout(cdev, 3*HZ); | |
596 | } | |
597 | } | |
598 | ||
599 | ||
1da177e4 LT |
600 | void |
601 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
602 | { | |
28bdc6f6 PO |
603 | struct subchannel *sch; |
604 | ||
605 | sch = to_subchannel(cdev->dev.parent); | |
606 | /* Update schib - pom may have changed. */ | |
607 | stsch(sch->schid, &sch->schib); | |
608 | /* Update lpm with verified path mask. */ | |
609 | sch->lpm = sch->vpm; | |
610 | /* Repeat path verification? */ | |
611 | if (cdev->private->flags.doverify) { | |
612 | cdev->private->flags.doverify = 0; | |
613 | ccw_device_verify_start(cdev); | |
614 | return; | |
615 | } | |
1da177e4 LT |
616 | switch (err) { |
617 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
618 | cdev->private->options.pgroup = 0; | |
619 | case 0: | |
620 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
621 | /* Deliver fake irb to device driver, if needed. */ | |
622 | if (cdev->private->flags.fake_irb) { | |
623 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
292888c8 HC |
624 | cdev->private->irb.scsw.cc = 1; |
625 | cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC; | |
626 | cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND; | |
627 | cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
628 | cdev->private->flags.fake_irb = 0; |
629 | if (cdev->handler) | |
630 | cdev->handler(cdev, cdev->private->intparm, | |
631 | &cdev->private->irb); | |
632 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
633 | } | |
634 | break; | |
635 | case -ETIME: | |
8b42f5c2 PO |
636 | /* Reset oper notify indication after verify error. */ |
637 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
638 | ccw_device_done(cdev, DEV_STATE_BOXED); |
639 | break; | |
640 | default: | |
8b42f5c2 PO |
641 | /* Reset oper notify indication after verify error. */ |
642 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
643 | if (cdev->online) { |
644 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 645 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 646 | } else |
ee04bbcc | 647 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
648 | break; |
649 | } | |
650 | } | |
651 | ||
652 | /* | |
653 | * Get device online. | |
654 | */ | |
655 | int | |
656 | ccw_device_online(struct ccw_device *cdev) | |
657 | { | |
658 | struct subchannel *sch; | |
659 | int ret; | |
660 | ||
661 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
662 | (cdev->private->state != DEV_STATE_BOXED)) | |
663 | return -EINVAL; | |
664 | sch = to_subchannel(cdev->dev.parent); | |
665 | if (css_init_done && !get_device(&cdev->dev)) | |
666 | return -ENODEV; | |
edf22096 | 667 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
668 | if (ret != 0) { |
669 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
670 | if (ret == -ENODEV) | |
671 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
672 | return ret; | |
673 | } | |
674 | /* Do we want to do path grouping? */ | |
675 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
676 | /* Start initial path verification. */ |
677 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 678 | cdev->private->flags.doverify = 0; |
7e560814 | 679 | ccw_device_verify_start(cdev); |
1da177e4 LT |
680 | return 0; |
681 | } | |
682 | /* Do a SensePGID first. */ | |
683 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
684 | ccw_device_sense_pgid_start(cdev); | |
685 | return 0; | |
686 | } | |
687 | ||
688 | void | |
689 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
690 | { | |
691 | switch (err) { | |
692 | case 0: | |
693 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
694 | break; | |
695 | case -ETIME: | |
696 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
697 | break; | |
698 | default: | |
3ecb0a5a | 699 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 700 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
701 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
702 | break; | |
703 | } | |
704 | } | |
705 | ||
706 | /* | |
707 | * Shutdown device. | |
708 | */ | |
709 | int | |
710 | ccw_device_offline(struct ccw_device *cdev) | |
711 | { | |
712 | struct subchannel *sch; | |
713 | ||
d7b5a4c9 CH |
714 | if (ccw_device_is_orphan(cdev)) { |
715 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
716 | return 0; | |
717 | } | |
1da177e4 | 718 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 719 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
720 | return -ENODEV; |
721 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
722 | if (sch->schib.scsw.actl != 0) | |
723 | return -EBUSY; | |
724 | return -EINVAL; | |
725 | } | |
726 | if (sch->schib.scsw.actl != 0) | |
727 | return -EBUSY; | |
728 | /* Are we doing path grouping? */ | |
729 | if (!cdev->private->options.pgroup) { | |
730 | /* No, set state offline immediately. */ | |
731 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
732 | return 0; | |
733 | } | |
734 | /* Start Set Path Group commands. */ | |
735 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
736 | ccw_device_disband_start(cdev); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Handle timeout in device online/offline process. | |
742 | */ | |
743 | static void | |
744 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
745 | { | |
746 | int ret; | |
747 | ||
748 | ret = ccw_device_cancel_halt_clear(cdev); | |
749 | switch (ret) { | |
750 | case 0: | |
751 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
752 | break; | |
753 | case -ENODEV: | |
754 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
755 | break; | |
756 | default: | |
757 | ccw_device_set_timeout(cdev, 3*HZ); | |
758 | } | |
759 | } | |
760 | ||
761 | /* | |
762 | * Handle not oper event in device recognition. | |
763 | */ | |
764 | static void | |
765 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
766 | { | |
767 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
768 | } | |
769 | ||
770 | /* | |
3f4cf6e7 | 771 | * Handle not operational event in non-special state. |
1da177e4 | 772 | */ |
3f4cf6e7 CH |
773 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
774 | enum dev_event dev_event) | |
1da177e4 LT |
775 | { |
776 | struct subchannel *sch; | |
777 | ||
778 | cdev->private->state = DEV_STATE_NOT_OPER; | |
779 | sch = to_subchannel(cdev->dev.parent); | |
3f4cf6e7 | 780 | css_schedule_eval(sch->schid); |
1da177e4 LT |
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); | |
18374d37 CH |
845 | if (cdev->private->flags.doverify) |
846 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
847 | return; |
848 | } | |
849 | /* Accumulate status and find out if a basic sense is needed. */ | |
850 | ccw_device_accumulate_irb(cdev, irb); | |
851 | if (cdev->private->flags.dosense) { | |
852 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
853 | cdev->private->state = DEV_STATE_W4SENSE; | |
854 | } | |
855 | return; | |
856 | } | |
857 | /* Call the handler. */ | |
858 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
859 | /* Start delayed path verification. */ | |
860 | ccw_device_online_verify(cdev, 0); | |
861 | } | |
862 | ||
863 | /* | |
864 | * Got an timeout in online state. | |
865 | */ | |
866 | static void | |
867 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
868 | { | |
869 | int ret; | |
870 | ||
871 | ccw_device_set_timeout(cdev, 0); | |
872 | ret = ccw_device_cancel_halt_clear(cdev); | |
873 | if (ret == -EBUSY) { | |
874 | ccw_device_set_timeout(cdev, 3*HZ); | |
875 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
876 | return; | |
877 | } | |
3f4cf6e7 CH |
878 | if (ret == -ENODEV) |
879 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
880 | else if (cdev->handler) | |
1da177e4 LT |
881 | cdev->handler(cdev, cdev->private->intparm, |
882 | ERR_PTR(-ETIMEDOUT)); | |
883 | } | |
884 | ||
885 | /* | |
886 | * Got an interrupt for a basic sense. | |
887 | */ | |
2b67fc46 | 888 | static void |
1da177e4 LT |
889 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
890 | { | |
891 | struct irb *irb; | |
892 | ||
893 | irb = (struct irb *) __LC_IRB; | |
894 | /* Check for unsolicited interrupt. */ | |
895 | if (irb->scsw.stctl == | |
896 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
897 | if (irb->scsw.cc == 1) | |
898 | /* Basic sense hasn't started. Try again. */ | |
899 | ccw_device_do_sense(cdev, irb); | |
900 | else { | |
139b83dd | 901 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
902 | "interrupt during w4sense...\n", |
903 | cdev->private->dev_id.ssid, | |
904 | cdev->private->dev_id.devno); | |
1da177e4 LT |
905 | if (cdev->handler) |
906 | cdev->handler (cdev, 0, irb); | |
907 | } | |
908 | return; | |
909 | } | |
3ba1998e CH |
910 | /* |
911 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
912 | * only deliver the halt/clear interrupt to the device driver as if it | |
913 | * had killed the original request. | |
914 | */ | |
915 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
916 | /* Retry Basic Sense if requested. */ |
917 | if (cdev->private->flags.intretry) { | |
918 | cdev->private->flags.intretry = 0; | |
919 | ccw_device_do_sense(cdev, irb); | |
920 | return; | |
921 | } | |
3ba1998e CH |
922 | cdev->private->flags.dosense = 0; |
923 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
924 | ccw_device_accumulate_irb(cdev, irb); | |
925 | goto call_handler; | |
926 | } | |
1da177e4 LT |
927 | /* Add basic sense info to irb. */ |
928 | ccw_device_accumulate_basic_sense(cdev, irb); | |
929 | if (cdev->private->flags.dosense) { | |
930 | /* Another basic sense is needed. */ | |
931 | ccw_device_do_sense(cdev, irb); | |
932 | return; | |
933 | } | |
3ba1998e | 934 | call_handler: |
1da177e4 LT |
935 | cdev->private->state = DEV_STATE_ONLINE; |
936 | /* Call the handler. */ | |
937 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
938 | /* Start delayed path verification. */ | |
939 | ccw_device_online_verify(cdev, 0); | |
940 | } | |
941 | ||
942 | static void | |
943 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
944 | { | |
945 | struct irb *irb; | |
946 | ||
947 | irb = (struct irb *) __LC_IRB; | |
948 | /* Accumulate status. We don't do basic sense. */ | |
949 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
950 | /* Remember to clear irb to avoid residuals. */ |
951 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
952 | /* Try to start delayed device verification. */ |
953 | ccw_device_online_verify(cdev, 0); | |
954 | /* Note: Don't call handler for cio initiated clear! */ | |
955 | } | |
956 | ||
957 | static void | |
958 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
959 | { | |
960 | struct subchannel *sch; | |
961 | ||
962 | sch = to_subchannel(cdev->dev.parent); | |
963 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
964 | /* Start delayed path verification. */ |
965 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 966 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
967 | if (cdev->handler) |
968 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 969 | ERR_PTR(-EIO)); |
1da177e4 LT |
970 | } |
971 | ||
972 | static void | |
973 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
974 | { | |
975 | int ret; | |
976 | ||
977 | ret = ccw_device_cancel_halt_clear(cdev); | |
978 | if (ret == -EBUSY) { | |
979 | ccw_device_set_timeout(cdev, 3*HZ); | |
980 | return; | |
981 | } | |
7c8427c3 CH |
982 | /* Start delayed path verification. */ |
983 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
984 | if (cdev->handler) |
985 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 986 | ERR_PTR(-EIO)); |
1da177e4 LT |
987 | } |
988 | ||
e7769b48 | 989 | void device_kill_io(struct subchannel *sch) |
1da177e4 LT |
990 | { |
991 | int ret; | |
e7769b48 | 992 | struct ccw_device *cdev; |
1da177e4 | 993 | |
db6a6423 | 994 | cdev = sch_get_cdev(sch); |
1da177e4 LT |
995 | ret = ccw_device_cancel_halt_clear(cdev); |
996 | if (ret == -EBUSY) { | |
997 | ccw_device_set_timeout(cdev, 3*HZ); | |
998 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
999 | return; | |
1000 | } | |
7c8427c3 CH |
1001 | /* Start delayed path verification. */ |
1002 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
1003 | if (cdev->handler) |
1004 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 1005 | ERR_PTR(-EIO)); |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | static void | |
28bdc6f6 | 1009 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 1010 | { |
28bdc6f6 | 1011 | /* Start verification after current task finished. */ |
7e560814 | 1012 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
1013 | } |
1014 | ||
1015 | static void | |
1016 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1017 | { | |
1018 | struct irb *irb; | |
1019 | ||
1020 | switch (dev_event) { | |
1021 | case DEV_EVENT_INTERRUPT: | |
1022 | irb = (struct irb *) __LC_IRB; | |
1023 | /* Check for unsolicited interrupt. */ | |
1024 | if ((irb->scsw.stctl == | |
1025 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && | |
1026 | (!irb->scsw.cc)) | |
1027 | /* FIXME: we should restart stlck here, but this | |
1028 | * is extremely unlikely ... */ | |
1029 | goto out_wakeup; | |
1030 | ||
1031 | ccw_device_accumulate_irb(cdev, irb); | |
1032 | /* We don't care about basic sense etc. */ | |
1033 | break; | |
1034 | default: /* timeout */ | |
1035 | break; | |
1036 | } | |
1037 | out_wakeup: | |
1038 | wake_up(&cdev->private->wait_q); | |
1039 | } | |
1040 | ||
1041 | static void | |
1042 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1043 | { | |
1044 | struct subchannel *sch; | |
1045 | ||
1046 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 1047 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
1048 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
1049 | return; | |
1050 | ||
1051 | /* After 60s the device recognition is considered to have failed. */ | |
1052 | ccw_device_set_timeout(cdev, 60*HZ); | |
1053 | ||
1054 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1055 | ccw_device_sense_id_start(cdev); | |
1056 | } | |
1057 | ||
1058 | void | |
1059 | device_trigger_reprobe(struct subchannel *sch) | |
1060 | { | |
1061 | struct ccw_device *cdev; | |
1062 | ||
db6a6423 CH |
1063 | cdev = sch_get_cdev(sch); |
1064 | if (!cdev) | |
1da177e4 | 1065 | return; |
1da177e4 LT |
1066 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1067 | return; | |
1068 | ||
1069 | /* Update some values. */ | |
a8237fc4 | 1070 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 1071 | return; |
7674da77 CH |
1072 | if (!sch->schib.pmcw.dnv) |
1073 | return; | |
1da177e4 LT |
1074 | /* |
1075 | * The pim, pam, pom values may not be accurate, but they are the best | |
1076 | * we have before performing device selection :/ | |
1077 | */ | |
28bdc6f6 | 1078 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 | 1079 | /* Re-set some bits in the pmcw that were lost. */ |
1da177e4 LT |
1080 | sch->schib.pmcw.csense = 1; |
1081 | sch->schib.pmcw.ena = 0; | |
1082 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1083 | sch->schib.pmcw.mp = 1; | |
cd6b4f27 | 1084 | sch->schib.pmcw.intparm = (u32)(addr_t)sch; |
1da177e4 | 1085 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1086 | /* Check if this is another device which appeared on the same sch. */ |
1087 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1088 | PREPARE_WORK(&cdev->private->kick_work, | |
1089 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1090 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1091 | } else |
1092 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1093 | } |
1094 | ||
1095 | static void | |
1096 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1097 | { | |
1098 | struct subchannel *sch; | |
1099 | ||
1100 | sch = to_subchannel(cdev->dev.parent); | |
1101 | /* | |
1102 | * An interrupt in state offline means a previous disable was not | |
1103 | * successful. Try again. | |
1104 | */ | |
1105 | cio_disable_subchannel(sch); | |
1106 | } | |
1107 | ||
1108 | static void | |
1109 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1110 | { | |
1111 | retry_set_schib(cdev); | |
1112 | cdev->private->state = DEV_STATE_ONLINE; | |
1113 | dev_fsm_event(cdev, dev_event); | |
1114 | } | |
1115 | ||
94bb0633 CH |
1116 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1117 | enum dev_event dev_event) | |
1118 | { | |
1119 | cmf_retry_copy_block(cdev); | |
1120 | cdev->private->state = DEV_STATE_ONLINE; | |
1121 | dev_fsm_event(cdev, dev_event); | |
1122 | } | |
1da177e4 LT |
1123 | |
1124 | static void | |
1125 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1126 | { | |
1127 | ccw_device_set_timeout(cdev, 0); | |
1128 | if (dev_event == DEV_EVENT_NOTOPER) | |
1129 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1130 | else | |
1131 | cdev->private->state = DEV_STATE_OFFLINE; | |
1132 | wake_up(&cdev->private->wait_q); | |
1133 | } | |
1134 | ||
1135 | static void | |
1136 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1137 | { | |
1138 | int ret; | |
1139 | ||
1140 | ret = ccw_device_cancel_halt_clear(cdev); | |
1141 | switch (ret) { | |
1142 | case 0: | |
1143 | cdev->private->state = DEV_STATE_OFFLINE; | |
1144 | wake_up(&cdev->private->wait_q); | |
1145 | break; | |
1146 | case -ENODEV: | |
1147 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1148 | wake_up(&cdev->private->wait_q); | |
1149 | break; | |
1150 | default: | |
1151 | ccw_device_set_timeout(cdev, HZ/10); | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * No operation action. This is used e.g. to ignore a timeout event in | |
1157 | * state offline. | |
1158 | */ | |
1159 | static void | |
1160 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1161 | { | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Bug operation action. | |
1166 | */ | |
1167 | static void | |
1168 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1169 | { | |
139b83dd ME |
1170 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1171 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1172 | cdev->private->dev_id.ssid, | |
1173 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1174 | BUG(); |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * device statemachine | |
1179 | */ | |
1180 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1181 | [DEV_STATE_NOT_OPER] = { | |
1182 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1183 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1184 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1185 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1186 | }, | |
1187 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1188 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1189 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1190 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1191 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1192 | }, | |
1193 | [DEV_STATE_SENSE_ID] = { | |
1194 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1195 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1196 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1197 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1198 | }, | |
1199 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1200 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1201 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1202 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1203 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1204 | }, | |
1205 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1206 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1207 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1208 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1209 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1210 | }, |
1211 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1212 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1213 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1214 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1215 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1216 | }, | |
1217 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1218 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1219 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1220 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1221 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1222 | }, | |
1223 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1224 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1225 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1226 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1227 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1228 | }, | |
1229 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1230 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1231 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1232 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1233 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1234 | }, | |
1235 | /* states to wait for i/o completion before doing something */ | |
1236 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1237 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1238 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1239 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1240 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1241 | }, | |
1242 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1243 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1244 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1245 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1246 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1247 | }, | |
1da177e4 LT |
1248 | [DEV_STATE_QUIESCE] = { |
1249 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1250 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1251 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1252 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1253 | }, | |
1254 | /* special states for devices gone not operational */ | |
1255 | [DEV_STATE_DISCONNECTED] = { | |
1256 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1257 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1258 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1259 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1260 | }, |
1261 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1262 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1263 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1264 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1265 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1266 | }, | |
1267 | [DEV_STATE_CMFCHANGE] = { | |
1268 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1269 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1270 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1271 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1272 | }, | |
94bb0633 CH |
1273 | [DEV_STATE_CMFUPDATE] = { |
1274 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1275 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1276 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1277 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1278 | }, | |
1da177e4 LT |
1279 | }; |
1280 | ||
1da177e4 | 1281 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |