Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device_fsm.c | |
3 | * finite state machine for device handling | |
4 | * | |
c820de39 | 5 | * Copyright IBM Corp. 2002,2008 |
4ce3b30c | 6 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
1da177e4 | 11 | #include <linux/init.h> |
4e57b681 TS |
12 | #include <linux/jiffies.h> |
13 | #include <linux/string.h> | |
1da177e4 LT |
14 | |
15 | #include <asm/ccwdev.h> | |
4c24da79 | 16 | #include <asm/cio.h> |
e5854a58 | 17 | #include <asm/chpid.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" | |
e6b6e10a | 25 | #include "chp.h" |
1da177e4 | 26 | |
14ff56bb SO |
27 | static int timeout_log_enabled; |
28 | ||
14ff56bb SO |
29 | static int __init ccw_timeout_log_setup(char *unused) |
30 | { | |
31 | timeout_log_enabled = 1; | |
32 | return 1; | |
33 | } | |
34 | ||
35 | __setup("ccw_timeout_log", ccw_timeout_log_setup); | |
36 | ||
37 | static void ccw_timeout_log(struct ccw_device *cdev) | |
38 | { | |
39 | struct schib schib; | |
40 | struct subchannel *sch; | |
cd6b4f27 | 41 | struct io_subchannel_private *private; |
14ff56bb SO |
42 | int cc; |
43 | ||
44 | sch = to_subchannel(cdev->dev.parent); | |
cd6b4f27 | 45 | private = to_io_private(sch); |
14ff56bb SO |
46 | cc = stsch(sch->schid, &schib); |
47 | ||
48 | printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " | |
49 | "device information:\n", get_clock()); | |
50 | printk(KERN_WARNING "cio: orb:\n"); | |
51 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
cd6b4f27 | 52 | &private->orb, sizeof(private->orb), 0); |
14ff56bb SO |
53 | printk(KERN_WARNING "cio: ccw device bus id: %s\n", cdev->dev.bus_id); |
54 | printk(KERN_WARNING "cio: subchannel bus id: %s\n", sch->dev.bus_id); | |
55 | printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " | |
56 | "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); | |
57 | ||
cd6b4f27 CH |
58 | if ((void *)(addr_t)private->orb.cpa == &private->sense_ccw || |
59 | (void *)(addr_t)private->orb.cpa == cdev->private->iccws) | |
14ff56bb SO |
60 | printk(KERN_WARNING "cio: last channel program (intern):\n"); |
61 | else | |
62 | printk(KERN_WARNING "cio: last channel program:\n"); | |
63 | ||
64 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
cd6b4f27 CH |
65 | (void *)(addr_t)private->orb.cpa, |
66 | sizeof(struct ccw1), 0); | |
14ff56bb SO |
67 | printk(KERN_WARNING "cio: ccw device state: %d\n", |
68 | cdev->private->state); | |
69 | printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); | |
70 | printk(KERN_WARNING "cio: schib:\n"); | |
71 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
72 | &schib, sizeof(schib), 0); | |
73 | printk(KERN_WARNING "cio: ccw device flags:\n"); | |
74 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
75 | &cdev->private->flags, sizeof(cdev->private->flags), 0); | |
76 | } | |
77 | ||
1da177e4 LT |
78 | /* |
79 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
80 | */ | |
81 | static void | |
82 | ccw_device_timeout(unsigned long data) | |
83 | { | |
84 | struct ccw_device *cdev; | |
85 | ||
86 | cdev = (struct ccw_device *) data; | |
87 | spin_lock_irq(cdev->ccwlock); | |
14ff56bb SO |
88 | if (timeout_log_enabled) |
89 | ccw_timeout_log(cdev); | |
1da177e4 LT |
90 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); |
91 | spin_unlock_irq(cdev->ccwlock); | |
92 | } | |
93 | ||
94 | /* | |
95 | * Set timeout | |
96 | */ | |
97 | void | |
98 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
99 | { | |
100 | if (expires == 0) { | |
101 | del_timer(&cdev->private->timer); | |
102 | return; | |
103 | } | |
104 | if (timer_pending(&cdev->private->timer)) { | |
105 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
106 | return; | |
107 | } | |
108 | cdev->private->timer.function = ccw_device_timeout; | |
109 | cdev->private->timer.data = (unsigned long) cdev; | |
110 | cdev->private->timer.expires = jiffies + expires; | |
111 | add_timer(&cdev->private->timer); | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* |
115 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
116 | * asynchronous operations. We do one try with cio_cancel, two tries | |
117 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
118 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
119 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
120 | * status pending). | |
121 | */ | |
122 | int | |
123 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
124 | { | |
125 | struct subchannel *sch; | |
126 | int ret; | |
127 | ||
128 | sch = to_subchannel(cdev->dev.parent); | |
a8237fc4 | 129 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
130 | if (ret || !sch->schib.pmcw.dnv) |
131 | return -ENODEV; | |
2470b648 CH |
132 | if (!sch->schib.pmcw.ena) |
133 | /* Not operational -> done. */ | |
1da177e4 LT |
134 | return 0; |
135 | /* Stage 1: cancel io. */ | |
136 | if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) && | |
137 | !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
138 | ret = cio_cancel(sch); | |
139 | if (ret != -EINVAL) | |
140 | return ret; | |
141 | /* cancel io unsuccessful. From now on it is asynchronous. */ | |
142 | cdev->private->iretry = 3; /* 3 halt retries. */ | |
143 | } | |
144 | if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) { | |
145 | /* Stage 2: halt io. */ | |
146 | if (cdev->private->iretry) { | |
147 | cdev->private->iretry--; | |
148 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
149 | if (ret != -EBUSY) |
150 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
151 | } |
152 | /* halt io unsuccessful. */ | |
153 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
154 | } | |
155 | /* Stage 3: clear io. */ | |
156 | if (cdev->private->iretry) { | |
157 | cdev->private->iretry--; | |
158 | ret = cio_clear (sch); | |
159 | return (ret == 0) ? -EBUSY : ret; | |
160 | } | |
161 | panic("Can't stop i/o on subchannel.\n"); | |
162 | } | |
163 | ||
164 | static int | |
165 | ccw_device_handle_oper(struct ccw_device *cdev) | |
166 | { | |
167 | struct subchannel *sch; | |
168 | ||
169 | sch = to_subchannel(cdev->dev.parent); | |
170 | cdev->private->flags.recog_done = 1; | |
171 | /* | |
172 | * Check if cu type and device type still match. If | |
173 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 174 | * de- and re-register. |
1da177e4 LT |
175 | */ |
176 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
177 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
178 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 179 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 180 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 181 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
182 | queue_work(ccw_device_work, &cdev->private->kick_work); |
183 | return 0; | |
184 | } | |
185 | cdev->private->flags.donotify = 1; | |
186 | return 1; | |
187 | } | |
188 | ||
189 | /* | |
190 | * The machine won't give us any notification by machine check if a chpid has | |
191 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
192 | * the channel subsystem to device selection and updating our path masks). | |
193 | */ | |
4d284cac | 194 | static void |
1da177e4 LT |
195 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
196 | { | |
197 | int mask, i; | |
f86635fa | 198 | struct chp_id chpid; |
1da177e4 | 199 | |
f86635fa | 200 | chp_id_init(&chpid); |
1da177e4 LT |
201 | for (i = 0; i<8; i++) { |
202 | mask = 0x80 >> i; | |
203 | if (!(sch->lpm & mask)) | |
204 | continue; | |
205 | if (old_lpm & mask) | |
206 | continue; | |
f86635fa | 207 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
208 | if (!chp_is_registered(chpid)) |
209 | css_schedule_eval_all(); | |
1da177e4 LT |
210 | } |
211 | } | |
212 | ||
213 | /* | |
214 | * Stop device recognition. | |
215 | */ | |
216 | static void | |
217 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
218 | { | |
219 | struct subchannel *sch; | |
220 | int notify, old_lpm, same_dev; | |
221 | ||
222 | sch = to_subchannel(cdev->dev.parent); | |
223 | ||
224 | ccw_device_set_timeout(cdev, 0); | |
225 | cio_disable_subchannel(sch); | |
226 | /* | |
227 | * Now that we tried recognition, we have performed device selection | |
228 | * through ssch() and the path information is up to date. | |
229 | */ | |
230 | old_lpm = sch->lpm; | |
a8237fc4 | 231 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 232 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
233 | /* Check since device may again have become not operational. */ |
234 | if (!sch->schib.pmcw.dnv) | |
235 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
236 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
237 | /* Force reprobe on all chpids. */ | |
238 | old_lpm = 0; | |
239 | if (sch->lpm != old_lpm) | |
240 | __recover_lost_chpids(sch, old_lpm); | |
241 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
242 | if (state == DEV_STATE_NOT_OPER) { | |
243 | cdev->private->flags.recog_done = 1; | |
244 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
245 | return; | |
246 | } | |
247 | /* Boxed devices don't need extra treatment. */ | |
248 | } | |
249 | notify = 0; | |
250 | same_dev = 0; /* Keep the compiler quiet... */ | |
251 | switch (state) { | |
252 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
253 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
254 | "subchannel 0.%x.%04x\n", | |
255 | cdev->private->dev_id.devno, | |
256 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
257 | break; |
258 | case DEV_STATE_OFFLINE: | |
259 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
260 | same_dev = ccw_device_handle_oper(cdev); | |
261 | notify = 1; | |
262 | } | |
263 | /* fill out sense information */ | |
81388d2a | 264 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
265 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
266 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
267 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
268 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
269 | if (notify) { |
270 | cdev->private->state = DEV_STATE_OFFLINE; | |
271 | if (same_dev) { | |
272 | /* Get device online again. */ | |
273 | ccw_device_online(cdev); | |
274 | wake_up(&cdev->private->wait_q); | |
275 | } | |
276 | return; | |
277 | } | |
278 | /* Issue device info message. */ | |
139b83dd ME |
279 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " |
280 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
281 | "%04X/%02X\n", | |
282 | cdev->private->dev_id.ssid, | |
283 | cdev->private->dev_id.devno, | |
284 | cdev->id.cu_type, cdev->id.cu_model, | |
285 | cdev->id.dev_type, cdev->id.dev_model); | |
1da177e4 LT |
286 | break; |
287 | case DEV_STATE_BOXED: | |
139b83dd ME |
288 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
289 | " subchannel 0.%x.%04x\n", | |
290 | cdev->private->dev_id.devno, | |
291 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
292 | break; |
293 | } | |
294 | cdev->private->state = state; | |
295 | io_subchannel_recog_done(cdev); | |
296 | if (state != DEV_STATE_NOT_OPER) | |
297 | wake_up(&cdev->private->wait_q); | |
298 | } | |
299 | ||
300 | /* | |
301 | * Function called from device_id.c after sense id has completed. | |
302 | */ | |
303 | void | |
304 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
305 | { | |
306 | switch (err) { | |
307 | case 0: | |
308 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
309 | break; | |
310 | case -ETIME: /* Sense id stopped by timeout. */ | |
311 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
312 | break; | |
313 | default: | |
314 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
315 | break; | |
316 | } | |
317 | } | |
318 | ||
c820de39 CH |
319 | int ccw_device_notify(struct ccw_device *cdev, int event) |
320 | { | |
321 | if (!cdev->drv) | |
322 | return 0; | |
323 | if (!cdev->online) | |
324 | return 0; | |
325 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; | |
326 | } | |
327 | ||
1da177e4 | 328 | static void |
c1637532 | 329 | ccw_device_oper_notify(struct work_struct *work) |
1da177e4 | 330 | { |
c1637532 | 331 | struct ccw_device_private *priv; |
1da177e4 | 332 | struct ccw_device *cdev; |
1da177e4 | 333 | int ret; |
ee04bbcc | 334 | unsigned long flags; |
1da177e4 | 335 | |
c1637532 MS |
336 | priv = container_of(work, struct ccw_device_private, kick_work); |
337 | cdev = priv->cdev; | |
c820de39 | 338 | ret = ccw_device_notify(cdev, CIO_OPER); |
ee04bbcc | 339 | spin_lock_irqsave(cdev->ccwlock, flags); |
ee04bbcc | 340 | if (ret) { |
94bb0633 | 341 | /* Reenable channel measurements, if needed. */ |
ee04bbcc | 342 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
94bb0633 | 343 | cmf_reenable(cdev); |
ee04bbcc | 344 | spin_lock_irqsave(cdev->ccwlock, flags); |
1da177e4 | 345 | wake_up(&cdev->private->wait_q); |
94bb0633 | 346 | } |
ee04bbcc CH |
347 | spin_unlock_irqrestore(cdev->ccwlock, flags); |
348 | if (!ret) | |
349 | /* Driver doesn't want device back. */ | |
350 | ccw_device_do_unreg_rereg(work); | |
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) | |
139b83dd ME |
375 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
376 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
1da177e4 LT |
377 | |
378 | if (cdev->private->flags.donotify) { | |
379 | cdev->private->flags.donotify = 0; | |
c1637532 | 380 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify); |
1da177e4 LT |
381 | queue_work(ccw_device_notify_work, &cdev->private->kick_work); |
382 | } | |
383 | wake_up(&cdev->private->wait_q); | |
384 | ||
385 | if (css_init_done && state != DEV_STATE_ONLINE) | |
386 | put_device (&cdev->dev); | |
387 | } | |
388 | ||
4d284cac | 389 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
390 | { |
391 | char *c1; | |
392 | char *c2; | |
393 | ||
394 | c1 = (char *)p1; | |
395 | c2 = (char *)p2; | |
396 | ||
397 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
398 | } | |
399 | ||
400 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
401 | { | |
402 | int i; | |
403 | int last; | |
404 | ||
405 | last = 0; | |
406 | for (i = 0; i < 8; i++) { | |
407 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
408 | /* No PGID yet */ | |
409 | continue; | |
410 | if (cdev->private->pgid[last].inf.ps.state1 == | |
411 | SNID_STATE1_RESET) { | |
412 | /* First non-zero PGID */ | |
413 | last = i; | |
414 | continue; | |
415 | } | |
416 | if (cmp_pgid(&cdev->private->pgid[i], | |
417 | &cdev->private->pgid[last]) == 0) | |
418 | /* Non-conflicting PGIDs */ | |
419 | continue; | |
420 | ||
421 | /* PGID mismatch, can't pathgroup. */ | |
422 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
423 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
424 | cdev->private->dev_id.ssid, |
425 | cdev->private->dev_id.devno); | |
7e560814 CH |
426 | cdev->private->options.pgroup = 0; |
427 | return; | |
428 | } | |
429 | if (cdev->private->pgid[last].inf.ps.state1 == | |
430 | SNID_STATE1_RESET) | |
431 | /* No previous pgid found */ | |
7c9f4e3a CH |
432 | memcpy(&cdev->private->pgid[0], |
433 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
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); | |
edf22096 | 486 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
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 | ||
1da177e4 LT |
530 | void |
531 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
532 | { | |
28bdc6f6 PO |
533 | struct subchannel *sch; |
534 | ||
535 | sch = to_subchannel(cdev->dev.parent); | |
536 | /* Update schib - pom may have changed. */ | |
537 | stsch(sch->schid, &sch->schib); | |
538 | /* Update lpm with verified path mask. */ | |
539 | sch->lpm = sch->vpm; | |
540 | /* Repeat path verification? */ | |
541 | if (cdev->private->flags.doverify) { | |
542 | cdev->private->flags.doverify = 0; | |
543 | ccw_device_verify_start(cdev); | |
544 | return; | |
545 | } | |
1da177e4 LT |
546 | switch (err) { |
547 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
548 | cdev->private->options.pgroup = 0; | |
549 | case 0: | |
550 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
551 | /* Deliver fake irb to device driver, if needed. */ | |
552 | if (cdev->private->flags.fake_irb) { | |
553 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
292888c8 HC |
554 | cdev->private->irb.scsw.cc = 1; |
555 | cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC; | |
556 | cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND; | |
557 | cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
558 | cdev->private->flags.fake_irb = 0; |
559 | if (cdev->handler) | |
560 | cdev->handler(cdev, cdev->private->intparm, | |
561 | &cdev->private->irb); | |
562 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
563 | } | |
564 | break; | |
565 | case -ETIME: | |
8b42f5c2 PO |
566 | /* Reset oper notify indication after verify error. */ |
567 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
568 | ccw_device_done(cdev, DEV_STATE_BOXED); |
569 | break; | |
570 | default: | |
8b42f5c2 PO |
571 | /* Reset oper notify indication after verify error. */ |
572 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
573 | if (cdev->online) { |
574 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 575 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 576 | } else |
ee04bbcc | 577 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
578 | break; |
579 | } | |
580 | } | |
581 | ||
582 | /* | |
583 | * Get device online. | |
584 | */ | |
585 | int | |
586 | ccw_device_online(struct ccw_device *cdev) | |
587 | { | |
588 | struct subchannel *sch; | |
589 | int ret; | |
590 | ||
591 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
592 | (cdev->private->state != DEV_STATE_BOXED)) | |
593 | return -EINVAL; | |
594 | sch = to_subchannel(cdev->dev.parent); | |
595 | if (css_init_done && !get_device(&cdev->dev)) | |
596 | return -ENODEV; | |
edf22096 | 597 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
598 | if (ret != 0) { |
599 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
600 | if (ret == -ENODEV) | |
601 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
602 | return ret; | |
603 | } | |
604 | /* Do we want to do path grouping? */ | |
605 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
606 | /* Start initial path verification. */ |
607 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 608 | cdev->private->flags.doverify = 0; |
7e560814 | 609 | ccw_device_verify_start(cdev); |
1da177e4 LT |
610 | return 0; |
611 | } | |
612 | /* Do a SensePGID first. */ | |
613 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
614 | ccw_device_sense_pgid_start(cdev); | |
615 | return 0; | |
616 | } | |
617 | ||
618 | void | |
619 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
620 | { | |
621 | switch (err) { | |
622 | case 0: | |
623 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
624 | break; | |
625 | case -ETIME: | |
626 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
627 | break; | |
628 | default: | |
3ecb0a5a | 629 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 630 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
631 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
632 | break; | |
633 | } | |
634 | } | |
635 | ||
636 | /* | |
637 | * Shutdown device. | |
638 | */ | |
639 | int | |
640 | ccw_device_offline(struct ccw_device *cdev) | |
641 | { | |
642 | struct subchannel *sch; | |
643 | ||
d7b5a4c9 CH |
644 | if (ccw_device_is_orphan(cdev)) { |
645 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
646 | return 0; | |
647 | } | |
1da177e4 | 648 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 649 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 LT |
650 | return -ENODEV; |
651 | if (cdev->private->state != DEV_STATE_ONLINE) { | |
652 | if (sch->schib.scsw.actl != 0) | |
653 | return -EBUSY; | |
654 | return -EINVAL; | |
655 | } | |
656 | if (sch->schib.scsw.actl != 0) | |
657 | return -EBUSY; | |
658 | /* Are we doing path grouping? */ | |
659 | if (!cdev->private->options.pgroup) { | |
660 | /* No, set state offline immediately. */ | |
661 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
662 | return 0; | |
663 | } | |
664 | /* Start Set Path Group commands. */ | |
665 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
666 | ccw_device_disband_start(cdev); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Handle timeout in device online/offline process. | |
672 | */ | |
673 | static void | |
674 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
675 | { | |
676 | int ret; | |
677 | ||
678 | ret = ccw_device_cancel_halt_clear(cdev); | |
679 | switch (ret) { | |
680 | case 0: | |
681 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
682 | break; | |
683 | case -ENODEV: | |
684 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
685 | break; | |
686 | default: | |
687 | ccw_device_set_timeout(cdev, 3*HZ); | |
688 | } | |
689 | } | |
690 | ||
691 | /* | |
692 | * Handle not oper event in device recognition. | |
693 | */ | |
694 | static void | |
695 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
696 | { | |
697 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
698 | } | |
699 | ||
700 | /* | |
3f4cf6e7 | 701 | * Handle not operational event in non-special state. |
1da177e4 | 702 | */ |
3f4cf6e7 CH |
703 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
704 | enum dev_event dev_event) | |
1da177e4 LT |
705 | { |
706 | struct subchannel *sch; | |
707 | ||
708 | cdev->private->state = DEV_STATE_NOT_OPER; | |
709 | sch = to_subchannel(cdev->dev.parent); | |
3f4cf6e7 | 710 | css_schedule_eval(sch->schid); |
1da177e4 LT |
711 | } |
712 | ||
713 | /* | |
714 | * Handle path verification event. | |
715 | */ | |
716 | static void | |
717 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
718 | { | |
719 | struct subchannel *sch; | |
720 | ||
1da177e4 LT |
721 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
722 | cdev->private->flags.doverify = 1; | |
723 | return; | |
724 | } | |
725 | sch = to_subchannel(cdev->dev.parent); | |
726 | /* | |
727 | * Since we might not just be coming from an interrupt from the | |
728 | * subchannel we have to update the schib. | |
729 | */ | |
a8237fc4 | 730 | stsch(sch->schid, &sch->schib); |
1da177e4 LT |
731 | |
732 | if (sch->schib.scsw.actl != 0 || | |
65200c29 | 733 | (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) || |
1da177e4 LT |
734 | (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) { |
735 | /* | |
736 | * No final status yet or final status not yet delivered | |
737 | * to the device driver. Can't do path verfication now, | |
738 | * delay until final status was delivered. | |
739 | */ | |
740 | cdev->private->flags.doverify = 1; | |
741 | return; | |
742 | } | |
743 | /* Device is idle, we can do the path verification. */ | |
744 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 745 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
746 | ccw_device_verify_start(cdev); |
747 | } | |
748 | ||
749 | /* | |
750 | * Got an interrupt for a normal io (state online). | |
751 | */ | |
752 | static void | |
753 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
754 | { | |
755 | struct irb *irb; | |
756 | ||
757 | irb = (struct irb *) __LC_IRB; | |
758 | /* Check for unsolicited interrupt. */ | |
759 | if ((irb->scsw.stctl == | |
760 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) | |
761 | && (!irb->scsw.cc)) { | |
762 | if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) && | |
763 | !irb->esw.esw0.erw.cons) { | |
764 | /* Unit check but no sense data. Need basic sense. */ | |
765 | if (ccw_device_do_sense(cdev, irb) != 0) | |
766 | goto call_handler_unsol; | |
e0ec5749 | 767 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
768 | cdev->private->state = DEV_STATE_W4SENSE; |
769 | cdev->private->intparm = 0; | |
770 | return; | |
771 | } | |
772 | call_handler_unsol: | |
773 | if (cdev->handler) | |
774 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
775 | if (cdev->private->flags.doverify) |
776 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
777 | return; |
778 | } | |
779 | /* Accumulate status and find out if a basic sense is needed. */ | |
780 | ccw_device_accumulate_irb(cdev, irb); | |
781 | if (cdev->private->flags.dosense) { | |
782 | if (ccw_device_do_sense(cdev, irb) == 0) { | |
783 | cdev->private->state = DEV_STATE_W4SENSE; | |
784 | } | |
785 | return; | |
786 | } | |
787 | /* Call the handler. */ | |
788 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
789 | /* Start delayed path verification. */ | |
790 | ccw_device_online_verify(cdev, 0); | |
791 | } | |
792 | ||
793 | /* | |
794 | * Got an timeout in online state. | |
795 | */ | |
796 | static void | |
797 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
798 | { | |
799 | int ret; | |
800 | ||
801 | ccw_device_set_timeout(cdev, 0); | |
802 | ret = ccw_device_cancel_halt_clear(cdev); | |
803 | if (ret == -EBUSY) { | |
804 | ccw_device_set_timeout(cdev, 3*HZ); | |
805 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
806 | return; | |
807 | } | |
3f4cf6e7 CH |
808 | if (ret == -ENODEV) |
809 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
810 | else if (cdev->handler) | |
1da177e4 LT |
811 | cdev->handler(cdev, cdev->private->intparm, |
812 | ERR_PTR(-ETIMEDOUT)); | |
813 | } | |
814 | ||
815 | /* | |
816 | * Got an interrupt for a basic sense. | |
817 | */ | |
2b67fc46 | 818 | static void |
1da177e4 LT |
819 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
820 | { | |
821 | struct irb *irb; | |
822 | ||
823 | irb = (struct irb *) __LC_IRB; | |
824 | /* Check for unsolicited interrupt. */ | |
825 | if (irb->scsw.stctl == | |
826 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
827 | if (irb->scsw.cc == 1) | |
828 | /* Basic sense hasn't started. Try again. */ | |
829 | ccw_device_do_sense(cdev, irb); | |
830 | else { | |
139b83dd | 831 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
832 | "interrupt during w4sense...\n", |
833 | cdev->private->dev_id.ssid, | |
834 | cdev->private->dev_id.devno); | |
1da177e4 LT |
835 | if (cdev->handler) |
836 | cdev->handler (cdev, 0, irb); | |
837 | } | |
838 | return; | |
839 | } | |
3ba1998e CH |
840 | /* |
841 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
842 | * only deliver the halt/clear interrupt to the device driver as if it | |
843 | * had killed the original request. | |
844 | */ | |
845 | if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
846 | /* Retry Basic Sense if requested. */ |
847 | if (cdev->private->flags.intretry) { | |
848 | cdev->private->flags.intretry = 0; | |
849 | ccw_device_do_sense(cdev, irb); | |
850 | return; | |
851 | } | |
3ba1998e CH |
852 | cdev->private->flags.dosense = 0; |
853 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
854 | ccw_device_accumulate_irb(cdev, irb); | |
855 | goto call_handler; | |
856 | } | |
1da177e4 LT |
857 | /* Add basic sense info to irb. */ |
858 | ccw_device_accumulate_basic_sense(cdev, irb); | |
859 | if (cdev->private->flags.dosense) { | |
860 | /* Another basic sense is needed. */ | |
861 | ccw_device_do_sense(cdev, irb); | |
862 | return; | |
863 | } | |
3ba1998e | 864 | call_handler: |
1da177e4 LT |
865 | cdev->private->state = DEV_STATE_ONLINE; |
866 | /* Call the handler. */ | |
867 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
868 | /* Start delayed path verification. */ | |
869 | ccw_device_online_verify(cdev, 0); | |
870 | } | |
871 | ||
872 | static void | |
873 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
874 | { | |
875 | struct irb *irb; | |
876 | ||
877 | irb = (struct irb *) __LC_IRB; | |
878 | /* Accumulate status. We don't do basic sense. */ | |
879 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
880 | /* Remember to clear irb to avoid residuals. */ |
881 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
882 | /* Try to start delayed device verification. */ |
883 | ccw_device_online_verify(cdev, 0); | |
884 | /* Note: Don't call handler for cio initiated clear! */ | |
885 | } | |
886 | ||
887 | static void | |
888 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
889 | { | |
890 | struct subchannel *sch; | |
891 | ||
892 | sch = to_subchannel(cdev->dev.parent); | |
893 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
894 | /* Start delayed path verification. */ |
895 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 896 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
897 | if (cdev->handler) |
898 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 899 | ERR_PTR(-EIO)); |
1da177e4 LT |
900 | } |
901 | ||
902 | static void | |
903 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
904 | { | |
905 | int ret; | |
906 | ||
907 | ret = ccw_device_cancel_halt_clear(cdev); | |
908 | if (ret == -EBUSY) { | |
909 | ccw_device_set_timeout(cdev, 3*HZ); | |
910 | return; | |
911 | } | |
7c8427c3 CH |
912 | /* Start delayed path verification. */ |
913 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
914 | if (cdev->handler) |
915 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 916 | ERR_PTR(-EIO)); |
1da177e4 LT |
917 | } |
918 | ||
c820de39 | 919 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
920 | { |
921 | int ret; | |
1da177e4 | 922 | |
1da177e4 LT |
923 | ret = ccw_device_cancel_halt_clear(cdev); |
924 | if (ret == -EBUSY) { | |
925 | ccw_device_set_timeout(cdev, 3*HZ); | |
926 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
927 | return; | |
928 | } | |
7c8427c3 CH |
929 | /* Start delayed path verification. */ |
930 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
931 | if (cdev->handler) |
932 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 933 | ERR_PTR(-EIO)); |
1da177e4 LT |
934 | } |
935 | ||
936 | static void | |
28bdc6f6 | 937 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 938 | { |
28bdc6f6 | 939 | /* Start verification after current task finished. */ |
7e560814 | 940 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
941 | } |
942 | ||
943 | static void | |
944 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
945 | { | |
946 | struct irb *irb; | |
947 | ||
948 | switch (dev_event) { | |
949 | case DEV_EVENT_INTERRUPT: | |
950 | irb = (struct irb *) __LC_IRB; | |
951 | /* Check for unsolicited interrupt. */ | |
952 | if ((irb->scsw.stctl == | |
953 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && | |
954 | (!irb->scsw.cc)) | |
955 | /* FIXME: we should restart stlck here, but this | |
956 | * is extremely unlikely ... */ | |
957 | goto out_wakeup; | |
958 | ||
959 | ccw_device_accumulate_irb(cdev, irb); | |
960 | /* We don't care about basic sense etc. */ | |
961 | break; | |
962 | default: /* timeout */ | |
963 | break; | |
964 | } | |
965 | out_wakeup: | |
966 | wake_up(&cdev->private->wait_q); | |
967 | } | |
968 | ||
969 | static void | |
970 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
971 | { | |
972 | struct subchannel *sch; | |
973 | ||
974 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 975 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
976 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
977 | return; | |
978 | ||
979 | /* After 60s the device recognition is considered to have failed. */ | |
980 | ccw_device_set_timeout(cdev, 60*HZ); | |
981 | ||
982 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
983 | ccw_device_sense_id_start(cdev); | |
984 | } | |
985 | ||
c820de39 | 986 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 987 | { |
c820de39 | 988 | struct subchannel *sch; |
1da177e4 | 989 | |
1da177e4 LT |
990 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
991 | return; | |
992 | ||
c820de39 | 993 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 994 | /* Update some values. */ |
a8237fc4 | 995 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 996 | return; |
7674da77 CH |
997 | if (!sch->schib.pmcw.dnv) |
998 | return; | |
1da177e4 LT |
999 | /* |
1000 | * The pim, pam, pom values may not be accurate, but they are the best | |
1001 | * we have before performing device selection :/ | |
1002 | */ | |
28bdc6f6 | 1003 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 | 1004 | /* Re-set some bits in the pmcw that were lost. */ |
1da177e4 LT |
1005 | sch->schib.pmcw.csense = 1; |
1006 | sch->schib.pmcw.ena = 0; | |
1007 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1008 | sch->schib.pmcw.mp = 1; | |
1da177e4 | 1009 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1010 | /* Check if this is another device which appeared on the same sch. */ |
1011 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1012 | PREPARE_WORK(&cdev->private->kick_work, | |
1013 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1014 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1015 | } else |
1016 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | static void | |
1020 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1021 | { | |
1022 | struct subchannel *sch; | |
1023 | ||
1024 | sch = to_subchannel(cdev->dev.parent); | |
1025 | /* | |
1026 | * An interrupt in state offline means a previous disable was not | |
1027 | * successful. Try again. | |
1028 | */ | |
1029 | cio_disable_subchannel(sch); | |
1030 | } | |
1031 | ||
1032 | static void | |
1033 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1034 | { | |
1035 | retry_set_schib(cdev); | |
1036 | cdev->private->state = DEV_STATE_ONLINE; | |
1037 | dev_fsm_event(cdev, dev_event); | |
1038 | } | |
1039 | ||
94bb0633 CH |
1040 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1041 | enum dev_event dev_event) | |
1042 | { | |
1043 | cmf_retry_copy_block(cdev); | |
1044 | cdev->private->state = DEV_STATE_ONLINE; | |
1045 | dev_fsm_event(cdev, dev_event); | |
1046 | } | |
1da177e4 LT |
1047 | |
1048 | static void | |
1049 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1050 | { | |
1051 | ccw_device_set_timeout(cdev, 0); | |
1052 | if (dev_event == DEV_EVENT_NOTOPER) | |
1053 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1054 | else | |
1055 | cdev->private->state = DEV_STATE_OFFLINE; | |
1056 | wake_up(&cdev->private->wait_q); | |
1057 | } | |
1058 | ||
1059 | static void | |
1060 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1061 | { | |
1062 | int ret; | |
1063 | ||
1064 | ret = ccw_device_cancel_halt_clear(cdev); | |
1065 | switch (ret) { | |
1066 | case 0: | |
1067 | cdev->private->state = DEV_STATE_OFFLINE; | |
1068 | wake_up(&cdev->private->wait_q); | |
1069 | break; | |
1070 | case -ENODEV: | |
1071 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1072 | wake_up(&cdev->private->wait_q); | |
1073 | break; | |
1074 | default: | |
1075 | ccw_device_set_timeout(cdev, HZ/10); | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * No operation action. This is used e.g. to ignore a timeout event in | |
1081 | * state offline. | |
1082 | */ | |
1083 | static void | |
1084 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1085 | { | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Bug operation action. | |
1090 | */ | |
1091 | static void | |
1092 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1093 | { | |
139b83dd ME |
1094 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1095 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1096 | cdev->private->dev_id.ssid, | |
1097 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1098 | BUG(); |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * device statemachine | |
1103 | */ | |
1104 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1105 | [DEV_STATE_NOT_OPER] = { | |
1106 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1107 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1108 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1109 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1110 | }, | |
1111 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1112 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1113 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1114 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1115 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1116 | }, | |
1117 | [DEV_STATE_SENSE_ID] = { | |
1118 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1119 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1120 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1121 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1122 | }, | |
1123 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1124 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1125 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1126 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1127 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1128 | }, | |
1129 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1130 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1131 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1132 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1133 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1134 | }, |
1135 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1136 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1137 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1138 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1139 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1140 | }, | |
1141 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1142 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1143 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1144 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1145 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1146 | }, | |
1147 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1148 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1149 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1150 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1151 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1152 | }, | |
1153 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1154 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1155 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1156 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1157 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1158 | }, | |
1159 | /* states to wait for i/o completion before doing something */ | |
1160 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1161 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1162 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1163 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1164 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1165 | }, | |
1166 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1167 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1168 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1169 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1170 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1171 | }, | |
1da177e4 LT |
1172 | [DEV_STATE_QUIESCE] = { |
1173 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1174 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1175 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1176 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1177 | }, | |
1178 | /* special states for devices gone not operational */ | |
1179 | [DEV_STATE_DISCONNECTED] = { | |
1180 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1181 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1182 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1183 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1184 | }, |
1185 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1186 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1187 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1188 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1189 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1190 | }, | |
1191 | [DEV_STATE_CMFCHANGE] = { | |
1192 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1193 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1194 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1195 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1196 | }, | |
94bb0633 CH |
1197 | [DEV_STATE_CMFUPDATE] = { |
1198 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1199 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1200 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1201 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1202 | }, | |
1da177e4 LT |
1203 | }; |
1204 | ||
1da177e4 | 1205 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |