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; |
83262d63 | 42 | union orb *orb; |
14ff56bb SO |
43 | int cc; |
44 | ||
45 | sch = to_subchannel(cdev->dev.parent); | |
cd6b4f27 | 46 | private = to_io_private(sch); |
83262d63 | 47 | orb = &private->orb; |
14ff56bb SO |
48 | cc = stsch(sch->schid, &schib); |
49 | ||
50 | printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, " | |
51 | "device information:\n", get_clock()); | |
52 | printk(KERN_WARNING "cio: orb:\n"); | |
53 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
83262d63 | 54 | orb, sizeof(*orb), 0); |
2a0217d5 KS |
55 | printk(KERN_WARNING "cio: ccw device bus id: %s\n", |
56 | dev_name(&cdev->dev)); | |
57 | printk(KERN_WARNING "cio: subchannel bus id: %s\n", | |
58 | dev_name(&sch->dev)); | |
14ff56bb SO |
59 | printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, " |
60 | "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm); | |
61 | ||
83262d63 PO |
62 | if (orb->tm.b) { |
63 | printk(KERN_WARNING "cio: orb indicates transport mode\n"); | |
64 | printk(KERN_WARNING "cio: last tcw:\n"); | |
65 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
66 | (void *)(addr_t)orb->tm.tcw, | |
67 | sizeof(struct tcw), 0); | |
68 | } else { | |
69 | printk(KERN_WARNING "cio: orb indicates command mode\n"); | |
70 | if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw || | |
71 | (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws) | |
72 | printk(KERN_WARNING "cio: last channel program " | |
73 | "(intern):\n"); | |
74 | else | |
75 | printk(KERN_WARNING "cio: last channel program:\n"); | |
76 | ||
77 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
78 | (void *)(addr_t)orb->cmd.cpa, | |
79 | sizeof(struct ccw1), 0); | |
80 | } | |
14ff56bb SO |
81 | printk(KERN_WARNING "cio: ccw device state: %d\n", |
82 | cdev->private->state); | |
83 | printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc); | |
84 | printk(KERN_WARNING "cio: schib:\n"); | |
85 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
86 | &schib, sizeof(schib), 0); | |
87 | printk(KERN_WARNING "cio: ccw device flags:\n"); | |
88 | print_hex_dump(KERN_WARNING, "cio: ", DUMP_PREFIX_NONE, 16, 1, | |
89 | &cdev->private->flags, sizeof(cdev->private->flags), 0); | |
90 | } | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * Timeout function. It just triggers a DEV_EVENT_TIMEOUT. | |
94 | */ | |
95 | static void | |
96 | ccw_device_timeout(unsigned long data) | |
97 | { | |
98 | struct ccw_device *cdev; | |
99 | ||
100 | cdev = (struct ccw_device *) data; | |
101 | spin_lock_irq(cdev->ccwlock); | |
14ff56bb SO |
102 | if (timeout_log_enabled) |
103 | ccw_timeout_log(cdev); | |
1da177e4 LT |
104 | dev_fsm_event(cdev, DEV_EVENT_TIMEOUT); |
105 | spin_unlock_irq(cdev->ccwlock); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Set timeout | |
110 | */ | |
111 | void | |
112 | ccw_device_set_timeout(struct ccw_device *cdev, int expires) | |
113 | { | |
114 | if (expires == 0) { | |
115 | del_timer(&cdev->private->timer); | |
116 | return; | |
117 | } | |
118 | if (timer_pending(&cdev->private->timer)) { | |
119 | if (mod_timer(&cdev->private->timer, jiffies + expires)) | |
120 | return; | |
121 | } | |
122 | cdev->private->timer.function = ccw_device_timeout; | |
123 | cdev->private->timer.data = (unsigned long) cdev; | |
124 | cdev->private->timer.expires = jiffies + expires; | |
125 | add_timer(&cdev->private->timer); | |
126 | } | |
127 | ||
1da177e4 LT |
128 | /* |
129 | * Cancel running i/o. This is called repeatedly since halt/clear are | |
130 | * asynchronous operations. We do one try with cio_cancel, two tries | |
131 | * with cio_halt, 255 tries with cio_clear. If everythings fails panic. | |
132 | * Returns 0 if device now idle, -ENODEV for device not operational and | |
133 | * -EBUSY if an interrupt is expected (either from halt/clear or from a | |
134 | * status pending). | |
135 | */ | |
136 | int | |
137 | ccw_device_cancel_halt_clear(struct ccw_device *cdev) | |
138 | { | |
139 | struct subchannel *sch; | |
140 | int ret; | |
141 | ||
142 | sch = to_subchannel(cdev->dev.parent); | |
cdb912a4 | 143 | if (cio_update_schib(sch)) |
1da177e4 | 144 | return -ENODEV; |
2470b648 CH |
145 | if (!sch->schib.pmcw.ena) |
146 | /* Not operational -> done. */ | |
1da177e4 LT |
147 | return 0; |
148 | /* Stage 1: cancel io. */ | |
23d805b6 PO |
149 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && |
150 | !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { | |
83262d63 PO |
151 | if (!scsw_is_tm(&sch->schib.scsw)) { |
152 | ret = cio_cancel(sch); | |
153 | if (ret != -EINVAL) | |
154 | return ret; | |
155 | } | |
156 | /* cancel io unsuccessful or not applicable (transport mode). | |
157 | * Continue with asynchronous instructions. */ | |
1da177e4 LT |
158 | cdev->private->iretry = 3; /* 3 halt retries. */ |
159 | } | |
23d805b6 | 160 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { |
1da177e4 LT |
161 | /* Stage 2: halt io. */ |
162 | if (cdev->private->iretry) { | |
163 | cdev->private->iretry--; | |
164 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
165 | if (ret != -EBUSY) |
166 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
167 | } |
168 | /* halt io unsuccessful. */ | |
169 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
170 | } | |
171 | /* Stage 3: clear io. */ | |
172 | if (cdev->private->iretry) { | |
173 | cdev->private->iretry--; | |
174 | ret = cio_clear (sch); | |
175 | return (ret == 0) ? -EBUSY : ret; | |
176 | } | |
177 | panic("Can't stop i/o on subchannel.\n"); | |
178 | } | |
179 | ||
180 | static int | |
181 | ccw_device_handle_oper(struct ccw_device *cdev) | |
182 | { | |
183 | struct subchannel *sch; | |
184 | ||
185 | sch = to_subchannel(cdev->dev.parent); | |
186 | cdev->private->flags.recog_done = 1; | |
187 | /* | |
188 | * Check if cu type and device type still match. If | |
189 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 190 | * de- and re-register. |
1da177e4 LT |
191 | */ |
192 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
193 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
194 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 195 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 196 | PREPARE_WORK(&cdev->private->kick_work, |
eb32ae8d | 197 | ccw_device_do_unbind_bind); |
1da177e4 LT |
198 | queue_work(ccw_device_work, &cdev->private->kick_work); |
199 | return 0; | |
200 | } | |
201 | cdev->private->flags.donotify = 1; | |
202 | return 1; | |
203 | } | |
204 | ||
205 | /* | |
206 | * The machine won't give us any notification by machine check if a chpid has | |
207 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
208 | * the channel subsystem to device selection and updating our path masks). | |
209 | */ | |
4d284cac | 210 | static void |
1da177e4 LT |
211 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
212 | { | |
213 | int mask, i; | |
f86635fa | 214 | struct chp_id chpid; |
1da177e4 | 215 | |
f86635fa | 216 | chp_id_init(&chpid); |
1da177e4 LT |
217 | for (i = 0; i<8; i++) { |
218 | mask = 0x80 >> i; | |
219 | if (!(sch->lpm & mask)) | |
220 | continue; | |
221 | if (old_lpm & mask) | |
222 | continue; | |
f86635fa | 223 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
224 | if (!chp_is_registered(chpid)) |
225 | css_schedule_eval_all(); | |
1da177e4 LT |
226 | } |
227 | } | |
228 | ||
229 | /* | |
230 | * Stop device recognition. | |
231 | */ | |
232 | static void | |
233 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
234 | { | |
235 | struct subchannel *sch; | |
236 | int notify, old_lpm, same_dev; | |
237 | ||
238 | sch = to_subchannel(cdev->dev.parent); | |
239 | ||
240 | ccw_device_set_timeout(cdev, 0); | |
241 | cio_disable_subchannel(sch); | |
242 | /* | |
243 | * Now that we tried recognition, we have performed device selection | |
244 | * through ssch() and the path information is up to date. | |
245 | */ | |
246 | old_lpm = sch->lpm; | |
cdb912a4 | 247 | |
4ffa9234 | 248 | /* Check since device may again have become not operational. */ |
cdb912a4 | 249 | if (cio_update_schib(sch)) |
4ffa9234 | 250 | state = DEV_STATE_NOT_OPER; |
cdb912a4 SO |
251 | else |
252 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
253 | ||
1da177e4 LT |
254 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
255 | /* Force reprobe on all chpids. */ | |
256 | old_lpm = 0; | |
257 | if (sch->lpm != old_lpm) | |
258 | __recover_lost_chpids(sch, old_lpm); | |
259 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
260 | if (state == DEV_STATE_NOT_OPER) { | |
261 | cdev->private->flags.recog_done = 1; | |
262 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
156013ff | 263 | wake_up(&cdev->private->wait_q); |
1da177e4 LT |
264 | return; |
265 | } | |
266 | /* Boxed devices don't need extra treatment. */ | |
267 | } | |
268 | notify = 0; | |
269 | same_dev = 0; /* Keep the compiler quiet... */ | |
270 | switch (state) { | |
271 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
272 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
273 | "subchannel 0.%x.%04x\n", | |
274 | cdev->private->dev_id.devno, | |
275 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
276 | break; |
277 | case DEV_STATE_OFFLINE: | |
278 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
279 | same_dev = ccw_device_handle_oper(cdev); | |
280 | notify = 1; | |
281 | } | |
282 | /* fill out sense information */ | |
81388d2a | 283 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
284 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
285 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
286 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
287 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
288 | if (notify) { |
289 | cdev->private->state = DEV_STATE_OFFLINE; | |
290 | if (same_dev) { | |
291 | /* Get device online again. */ | |
292 | ccw_device_online(cdev); | |
293 | wake_up(&cdev->private->wait_q); | |
294 | } | |
295 | return; | |
296 | } | |
297 | /* Issue device info message. */ | |
139b83dd ME |
298 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " |
299 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
300 | "%04X/%02X\n", | |
301 | cdev->private->dev_id.ssid, | |
302 | cdev->private->dev_id.devno, | |
303 | cdev->id.cu_type, cdev->id.cu_model, | |
304 | cdev->id.dev_type, cdev->id.dev_model); | |
1da177e4 LT |
305 | break; |
306 | case DEV_STATE_BOXED: | |
139b83dd ME |
307 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
308 | " subchannel 0.%x.%04x\n", | |
309 | cdev->private->dev_id.devno, | |
310 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
311 | break; |
312 | } | |
313 | cdev->private->state = state; | |
314 | io_subchannel_recog_done(cdev); | |
156013ff | 315 | wake_up(&cdev->private->wait_q); |
1da177e4 LT |
316 | } |
317 | ||
318 | /* | |
319 | * Function called from device_id.c after sense id has completed. | |
320 | */ | |
321 | void | |
322 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
323 | { | |
324 | switch (err) { | |
325 | case 0: | |
326 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
327 | break; | |
328 | case -ETIME: /* Sense id stopped by timeout. */ | |
329 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
330 | break; | |
331 | default: | |
332 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
333 | break; | |
334 | } | |
335 | } | |
336 | ||
c820de39 CH |
337 | int ccw_device_notify(struct ccw_device *cdev, int event) |
338 | { | |
339 | if (!cdev->drv) | |
340 | return 0; | |
341 | if (!cdev->online) | |
342 | return 0; | |
91c36919 PO |
343 | CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", |
344 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
345 | event); | |
c820de39 CH |
346 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
347 | } | |
348 | ||
91c36919 | 349 | static void cmf_reenable_delayed(struct work_struct *work) |
1da177e4 | 350 | { |
c1637532 | 351 | struct ccw_device_private *priv; |
1da177e4 | 352 | struct ccw_device *cdev; |
1da177e4 | 353 | |
c1637532 MS |
354 | priv = container_of(work, struct ccw_device_private, kick_work); |
355 | cdev = priv->cdev; | |
91c36919 PO |
356 | cmf_reenable(cdev); |
357 | } | |
358 | ||
359 | static void ccw_device_oper_notify(struct ccw_device *cdev) | |
360 | { | |
361 | if (ccw_device_notify(cdev, CIO_OPER)) { | |
94bb0633 | 362 | /* Reenable channel measurements, if needed. */ |
91c36919 PO |
363 | PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed); |
364 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
365 | return; | |
366 | } | |
367 | /* Driver doesn't want device back. */ | |
368 | ccw_device_set_notoper(cdev); | |
eb32ae8d | 369 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unbind_bind); |
91c36919 | 370 | queue_work(ccw_device_work, &cdev->private->kick_work); |
1da177e4 LT |
371 | } |
372 | ||
373 | /* | |
374 | * Finished with online/offline processing. | |
375 | */ | |
376 | static void | |
377 | ccw_device_done(struct ccw_device *cdev, int state) | |
378 | { | |
379 | struct subchannel *sch; | |
380 | ||
381 | sch = to_subchannel(cdev->dev.parent); | |
382 | ||
f1ee3281 CH |
383 | ccw_device_set_timeout(cdev, 0); |
384 | ||
1da177e4 LT |
385 | if (state != DEV_STATE_ONLINE) |
386 | cio_disable_subchannel(sch); | |
387 | ||
388 | /* Reset device status. */ | |
389 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
390 | ||
391 | cdev->private->state = state; | |
392 | ||
393 | ||
394 | if (state == DEV_STATE_BOXED) | |
139b83dd ME |
395 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
396 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
1da177e4 LT |
397 | |
398 | if (cdev->private->flags.donotify) { | |
399 | cdev->private->flags.donotify = 0; | |
91c36919 | 400 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
401 | } |
402 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
403 | } |
404 | ||
4d284cac | 405 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
406 | { |
407 | char *c1; | |
408 | char *c2; | |
409 | ||
410 | c1 = (char *)p1; | |
411 | c2 = (char *)p2; | |
412 | ||
413 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
414 | } | |
415 | ||
416 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
417 | { | |
418 | int i; | |
419 | int last; | |
420 | ||
421 | last = 0; | |
422 | for (i = 0; i < 8; i++) { | |
423 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
424 | /* No PGID yet */ | |
425 | continue; | |
426 | if (cdev->private->pgid[last].inf.ps.state1 == | |
427 | SNID_STATE1_RESET) { | |
428 | /* First non-zero PGID */ | |
429 | last = i; | |
430 | continue; | |
431 | } | |
432 | if (cmp_pgid(&cdev->private->pgid[i], | |
433 | &cdev->private->pgid[last]) == 0) | |
434 | /* Non-conflicting PGIDs */ | |
435 | continue; | |
436 | ||
437 | /* PGID mismatch, can't pathgroup. */ | |
438 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
439 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
440 | cdev->private->dev_id.ssid, |
441 | cdev->private->dev_id.devno); | |
7e560814 CH |
442 | cdev->private->options.pgroup = 0; |
443 | return; | |
444 | } | |
445 | if (cdev->private->pgid[last].inf.ps.state1 == | |
446 | SNID_STATE1_RESET) | |
447 | /* No previous pgid found */ | |
7c9f4e3a CH |
448 | memcpy(&cdev->private->pgid[0], |
449 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
450 | sizeof(struct pgid)); |
451 | else | |
452 | /* Use existing pgid */ | |
453 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
454 | sizeof(struct pgid)); | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* |
458 | * Function called from device_pgid.c after sense path ground has completed. | |
459 | */ | |
460 | void | |
461 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
462 | { | |
463 | struct subchannel *sch; | |
464 | ||
465 | sch = to_subchannel(cdev->dev.parent); | |
466 | switch (err) { | |
7e560814 CH |
467 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
468 | cdev->private->options.pgroup = 0; | |
469 | break; | |
470 | case 0: /* success */ | |
471 | case -EACCES: /* partial success, some paths not operational */ | |
472 | /* Check if all pgids are equal or 0. */ | |
473 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
474 | break; |
475 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
476 | case -EUSERS: /* device is reserved for someone else. */ | |
477 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 478 | return; |
1da177e4 LT |
479 | default: |
480 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 481 | return; |
1da177e4 | 482 | } |
7e560814 | 483 | /* Start Path Group verification. */ |
7e560814 | 484 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 485 | cdev->private->flags.doverify = 0; |
7e560814 | 486 | ccw_device_verify_start(cdev); |
1da177e4 LT |
487 | } |
488 | ||
489 | /* | |
490 | * Start device recognition. | |
491 | */ | |
492 | int | |
493 | ccw_device_recognition(struct ccw_device *cdev) | |
494 | { | |
495 | struct subchannel *sch; | |
496 | int ret; | |
497 | ||
498 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
499 | (cdev->private->state != DEV_STATE_BOXED)) | |
500 | return -EINVAL; | |
501 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 502 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
503 | if (ret != 0) |
504 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
505 | return ret; | |
506 | ||
507 | /* After 60s the device recognition is considered to have failed. */ | |
508 | ccw_device_set_timeout(cdev, 60*HZ); | |
509 | ||
510 | /* | |
511 | * We used to start here with a sense pgid to find out whether a device | |
512 | * is locked by someone else. Unfortunately, the sense pgid command | |
513 | * code has other meanings on devices predating the path grouping | |
514 | * algorithm, so we start with sense id and box the device after an | |
515 | * timeout (or if sense pgid during path verification detects the device | |
516 | * is locked, as may happen on newer devices). | |
517 | */ | |
518 | cdev->private->flags.recog_done = 0; | |
519 | cdev->private->state = DEV_STATE_SENSE_ID; | |
520 | ccw_device_sense_id_start(cdev); | |
521 | return 0; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Handle timeout in device recognition. | |
526 | */ | |
527 | static void | |
528 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
529 | { | |
530 | int ret; | |
531 | ||
532 | ret = ccw_device_cancel_halt_clear(cdev); | |
533 | switch (ret) { | |
534 | case 0: | |
535 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
536 | break; | |
537 | case -ENODEV: | |
538 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
539 | break; | |
540 | default: | |
541 | ccw_device_set_timeout(cdev, 3*HZ); | |
542 | } | |
543 | } | |
544 | ||
545 | ||
1da177e4 LT |
546 | void |
547 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
548 | { | |
28bdc6f6 PO |
549 | struct subchannel *sch; |
550 | ||
551 | sch = to_subchannel(cdev->dev.parent); | |
552 | /* Update schib - pom may have changed. */ | |
cdb912a4 SO |
553 | if (cio_update_schib(sch)) { |
554 | cdev->private->flags.donotify = 0; | |
555 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
556 | return; | |
557 | } | |
28bdc6f6 PO |
558 | /* Update lpm with verified path mask. */ |
559 | sch->lpm = sch->vpm; | |
560 | /* Repeat path verification? */ | |
561 | if (cdev->private->flags.doverify) { | |
562 | cdev->private->flags.doverify = 0; | |
563 | ccw_device_verify_start(cdev); | |
564 | return; | |
565 | } | |
1da177e4 LT |
566 | switch (err) { |
567 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
568 | cdev->private->options.pgroup = 0; | |
569 | case 0: | |
570 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
571 | /* Deliver fake irb to device driver, if needed. */ | |
572 | if (cdev->private->flags.fake_irb) { | |
573 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
574 | cdev->private->irb.scsw.cmd.cc = 1; |
575 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
576 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
577 | cdev->private->irb.scsw.cmd.stctl = | |
578 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
579 | cdev->private->flags.fake_irb = 0; |
580 | if (cdev->handler) | |
581 | cdev->handler(cdev, cdev->private->intparm, | |
582 | &cdev->private->irb); | |
583 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
584 | } | |
585 | break; | |
586 | case -ETIME: | |
8b42f5c2 PO |
587 | /* Reset oper notify indication after verify error. */ |
588 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
589 | ccw_device_done(cdev, DEV_STATE_BOXED); |
590 | break; | |
591 | default: | |
8b42f5c2 PO |
592 | /* Reset oper notify indication after verify error. */ |
593 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
594 | if (cdev->online) { |
595 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 596 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 597 | } else |
ee04bbcc | 598 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
599 | break; |
600 | } | |
601 | } | |
602 | ||
603 | /* | |
604 | * Get device online. | |
605 | */ | |
606 | int | |
607 | ccw_device_online(struct ccw_device *cdev) | |
608 | { | |
609 | struct subchannel *sch; | |
610 | int ret; | |
611 | ||
612 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
613 | (cdev->private->state != DEV_STATE_BOXED)) | |
614 | return -EINVAL; | |
615 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 616 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
617 | if (ret != 0) { |
618 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
619 | if (ret == -ENODEV) | |
620 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
621 | return ret; | |
622 | } | |
623 | /* Do we want to do path grouping? */ | |
624 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
625 | /* Start initial path verification. */ |
626 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 627 | cdev->private->flags.doverify = 0; |
7e560814 | 628 | ccw_device_verify_start(cdev); |
1da177e4 LT |
629 | return 0; |
630 | } | |
631 | /* Do a SensePGID first. */ | |
632 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
633 | ccw_device_sense_pgid_start(cdev); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | void | |
638 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
639 | { | |
640 | switch (err) { | |
641 | case 0: | |
642 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
643 | break; | |
644 | case -ETIME: | |
645 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
646 | break; | |
647 | default: | |
3ecb0a5a | 648 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 649 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
650 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
651 | break; | |
652 | } | |
653 | } | |
654 | ||
655 | /* | |
656 | * Shutdown device. | |
657 | */ | |
658 | int | |
659 | ccw_device_offline(struct ccw_device *cdev) | |
660 | { | |
661 | struct subchannel *sch; | |
662 | ||
b301ea8c PO |
663 | /* Allow ccw_device_offline while disconnected. */ |
664 | if (cdev->private->state == DEV_STATE_DISCONNECTED || | |
665 | cdev->private->state == DEV_STATE_NOT_OPER) { | |
666 | cdev->private->flags.donotify = 0; | |
667 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
668 | return 0; | |
669 | } | |
d7b5a4c9 CH |
670 | if (ccw_device_is_orphan(cdev)) { |
671 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
672 | return 0; | |
673 | } | |
1da177e4 | 674 | sch = to_subchannel(cdev->dev.parent); |
cdb912a4 | 675 | if (cio_update_schib(sch)) |
1da177e4 | 676 | return -ENODEV; |
23d805b6 | 677 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 678 | return -EBUSY; |
23d805b6 PO |
679 | if (cdev->private->state != DEV_STATE_ONLINE) |
680 | return -EINVAL; | |
1da177e4 LT |
681 | /* Are we doing path grouping? */ |
682 | if (!cdev->private->options.pgroup) { | |
683 | /* No, set state offline immediately. */ | |
684 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
685 | return 0; | |
686 | } | |
687 | /* Start Set Path Group commands. */ | |
688 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
689 | ccw_device_disband_start(cdev); | |
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * Handle timeout in device online/offline process. | |
695 | */ | |
696 | static void | |
697 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
698 | { | |
699 | int ret; | |
700 | ||
701 | ret = ccw_device_cancel_halt_clear(cdev); | |
702 | switch (ret) { | |
703 | case 0: | |
704 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
705 | break; | |
706 | case -ENODEV: | |
707 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
708 | break; | |
709 | default: | |
710 | ccw_device_set_timeout(cdev, 3*HZ); | |
711 | } | |
712 | } | |
713 | ||
714 | /* | |
715 | * Handle not oper event in device recognition. | |
716 | */ | |
717 | static void | |
718 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
719 | { | |
720 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
721 | } | |
722 | ||
723 | /* | |
3f4cf6e7 | 724 | * Handle not operational event in non-special state. |
1da177e4 | 725 | */ |
3f4cf6e7 CH |
726 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
727 | enum dev_event dev_event) | |
1da177e4 LT |
728 | { |
729 | struct subchannel *sch; | |
730 | ||
c08f294a | 731 | ccw_device_set_notoper(cdev); |
1da177e4 | 732 | sch = to_subchannel(cdev->dev.parent); |
3f4cf6e7 | 733 | css_schedule_eval(sch->schid); |
1da177e4 LT |
734 | } |
735 | ||
736 | /* | |
737 | * Handle path verification event. | |
738 | */ | |
739 | static void | |
740 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
741 | { | |
742 | struct subchannel *sch; | |
743 | ||
1da177e4 LT |
744 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
745 | cdev->private->flags.doverify = 1; | |
746 | return; | |
747 | } | |
748 | sch = to_subchannel(cdev->dev.parent); | |
749 | /* | |
750 | * Since we might not just be coming from an interrupt from the | |
751 | * subchannel we have to update the schib. | |
752 | */ | |
cdb912a4 SO |
753 | if (cio_update_schib(sch)) { |
754 | ccw_device_verify_done(cdev, -ENODEV); | |
755 | return; | |
756 | } | |
1da177e4 | 757 | |
23d805b6 PO |
758 | if (scsw_actl(&sch->schib.scsw) != 0 || |
759 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
760 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
761 | /* |
762 | * No final status yet or final status not yet delivered | |
763 | * to the device driver. Can't do path verfication now, | |
764 | * delay until final status was delivered. | |
765 | */ | |
766 | cdev->private->flags.doverify = 1; | |
767 | return; | |
768 | } | |
769 | /* Device is idle, we can do the path verification. */ | |
770 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 771 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
772 | ccw_device_verify_start(cdev); |
773 | } | |
774 | ||
775 | /* | |
776 | * Got an interrupt for a normal io (state online). | |
777 | */ | |
778 | static void | |
779 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
780 | { | |
781 | struct irb *irb; | |
83262d63 | 782 | int is_cmd; |
1da177e4 LT |
783 | |
784 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 785 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 786 | /* Check for unsolicited interrupt. */ |
23d805b6 | 787 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 788 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
789 | !irb->esw.esw0.erw.cons) { |
790 | /* Unit check but no sense data. Need basic sense. */ | |
791 | if (ccw_device_do_sense(cdev, irb) != 0) | |
792 | goto call_handler_unsol; | |
e0ec5749 | 793 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
794 | cdev->private->state = DEV_STATE_W4SENSE; |
795 | cdev->private->intparm = 0; | |
796 | return; | |
797 | } | |
798 | call_handler_unsol: | |
799 | if (cdev->handler) | |
800 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
801 | if (cdev->private->flags.doverify) |
802 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
803 | return; |
804 | } | |
805 | /* Accumulate status and find out if a basic sense is needed. */ | |
806 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 807 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
808 | if (ccw_device_do_sense(cdev, irb) == 0) { |
809 | cdev->private->state = DEV_STATE_W4SENSE; | |
810 | } | |
811 | return; | |
812 | } | |
813 | /* Call the handler. */ | |
814 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
815 | /* Start delayed path verification. */ | |
816 | ccw_device_online_verify(cdev, 0); | |
817 | } | |
818 | ||
819 | /* | |
820 | * Got an timeout in online state. | |
821 | */ | |
822 | static void | |
823 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
824 | { | |
825 | int ret; | |
826 | ||
827 | ccw_device_set_timeout(cdev, 0); | |
828 | ret = ccw_device_cancel_halt_clear(cdev); | |
829 | if (ret == -EBUSY) { | |
830 | ccw_device_set_timeout(cdev, 3*HZ); | |
831 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
832 | return; | |
833 | } | |
3f4cf6e7 CH |
834 | if (ret == -ENODEV) |
835 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
836 | else if (cdev->handler) | |
1da177e4 LT |
837 | cdev->handler(cdev, cdev->private->intparm, |
838 | ERR_PTR(-ETIMEDOUT)); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Got an interrupt for a basic sense. | |
843 | */ | |
2b67fc46 | 844 | static void |
1da177e4 LT |
845 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
846 | { | |
847 | struct irb *irb; | |
848 | ||
849 | irb = (struct irb *) __LC_IRB; | |
850 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
851 | if (scsw_stctl(&irb->scsw) == |
852 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
853 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
854 | /* Basic sense hasn't started. Try again. */ |
855 | ccw_device_do_sense(cdev, irb); | |
856 | else { | |
139b83dd | 857 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
858 | "interrupt during w4sense...\n", |
859 | cdev->private->dev_id.ssid, | |
860 | cdev->private->dev_id.devno); | |
1da177e4 LT |
861 | if (cdev->handler) |
862 | cdev->handler (cdev, 0, irb); | |
863 | } | |
864 | return; | |
865 | } | |
3ba1998e CH |
866 | /* |
867 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
868 | * only deliver the halt/clear interrupt to the device driver as if it | |
869 | * had killed the original request. | |
870 | */ | |
23d805b6 PO |
871 | if (scsw_fctl(&irb->scsw) & |
872 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
873 | /* Retry Basic Sense if requested. */ |
874 | if (cdev->private->flags.intretry) { | |
875 | cdev->private->flags.intretry = 0; | |
876 | ccw_device_do_sense(cdev, irb); | |
877 | return; | |
878 | } | |
3ba1998e CH |
879 | cdev->private->flags.dosense = 0; |
880 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
881 | ccw_device_accumulate_irb(cdev, irb); | |
882 | goto call_handler; | |
883 | } | |
1da177e4 LT |
884 | /* Add basic sense info to irb. */ |
885 | ccw_device_accumulate_basic_sense(cdev, irb); | |
886 | if (cdev->private->flags.dosense) { | |
887 | /* Another basic sense is needed. */ | |
888 | ccw_device_do_sense(cdev, irb); | |
889 | return; | |
890 | } | |
3ba1998e | 891 | call_handler: |
1da177e4 LT |
892 | cdev->private->state = DEV_STATE_ONLINE; |
893 | /* Call the handler. */ | |
894 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
895 | /* Start delayed path verification. */ | |
896 | ccw_device_online_verify(cdev, 0); | |
897 | } | |
898 | ||
899 | static void | |
900 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
901 | { | |
902 | struct irb *irb; | |
903 | ||
904 | irb = (struct irb *) __LC_IRB; | |
905 | /* Accumulate status. We don't do basic sense. */ | |
906 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
907 | /* Remember to clear irb to avoid residuals. */ |
908 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
909 | /* Try to start delayed device verification. */ |
910 | ccw_device_online_verify(cdev, 0); | |
911 | /* Note: Don't call handler for cio initiated clear! */ | |
912 | } | |
913 | ||
914 | static void | |
915 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
916 | { | |
917 | struct subchannel *sch; | |
918 | ||
919 | sch = to_subchannel(cdev->dev.parent); | |
920 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
921 | /* Start delayed path verification. */ |
922 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 923 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
924 | if (cdev->handler) |
925 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 926 | ERR_PTR(-EIO)); |
1da177e4 LT |
927 | } |
928 | ||
929 | static void | |
930 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
931 | { | |
932 | int ret; | |
933 | ||
934 | ret = ccw_device_cancel_halt_clear(cdev); | |
935 | if (ret == -EBUSY) { | |
936 | ccw_device_set_timeout(cdev, 3*HZ); | |
937 | return; | |
938 | } | |
7c8427c3 CH |
939 | /* Start delayed path verification. */ |
940 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
941 | if (cdev->handler) |
942 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 943 | ERR_PTR(-EIO)); |
1da177e4 LT |
944 | } |
945 | ||
c820de39 | 946 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
947 | { |
948 | int ret; | |
1da177e4 | 949 | |
1da177e4 LT |
950 | ret = ccw_device_cancel_halt_clear(cdev); |
951 | if (ret == -EBUSY) { | |
952 | ccw_device_set_timeout(cdev, 3*HZ); | |
953 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
954 | return; | |
955 | } | |
7c8427c3 CH |
956 | /* Start delayed path verification. */ |
957 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
958 | if (cdev->handler) |
959 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 960 | ERR_PTR(-EIO)); |
1da177e4 LT |
961 | } |
962 | ||
963 | static void | |
28bdc6f6 | 964 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 965 | { |
28bdc6f6 | 966 | /* Start verification after current task finished. */ |
7e560814 | 967 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
968 | } |
969 | ||
970 | static void | |
971 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
972 | { | |
973 | struct irb *irb; | |
974 | ||
975 | switch (dev_event) { | |
976 | case DEV_EVENT_INTERRUPT: | |
977 | irb = (struct irb *) __LC_IRB; | |
978 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 979 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 980 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 981 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
982 | /* FIXME: we should restart stlck here, but this |
983 | * is extremely unlikely ... */ | |
984 | goto out_wakeup; | |
985 | ||
986 | ccw_device_accumulate_irb(cdev, irb); | |
987 | /* We don't care about basic sense etc. */ | |
988 | break; | |
989 | default: /* timeout */ | |
990 | break; | |
991 | } | |
992 | out_wakeup: | |
993 | wake_up(&cdev->private->wait_q); | |
994 | } | |
995 | ||
996 | static void | |
997 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
998 | { | |
999 | struct subchannel *sch; | |
1000 | ||
1001 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 1002 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
1003 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
1004 | return; | |
1005 | ||
1006 | /* After 60s the device recognition is considered to have failed. */ | |
1007 | ccw_device_set_timeout(cdev, 60*HZ); | |
1008 | ||
1009 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1010 | ccw_device_sense_id_start(cdev); | |
1011 | } | |
1012 | ||
c820de39 | 1013 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1014 | { |
c820de39 | 1015 | struct subchannel *sch; |
1da177e4 | 1016 | |
1da177e4 LT |
1017 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1018 | return; | |
1019 | ||
c820de39 | 1020 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1021 | /* Update some values. */ |
cdb912a4 | 1022 | if (cio_update_schib(sch)) |
7674da77 | 1023 | return; |
1da177e4 LT |
1024 | /* |
1025 | * The pim, pam, pom values may not be accurate, but they are the best | |
1026 | * we have before performing device selection :/ | |
1027 | */ | |
28bdc6f6 | 1028 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
13952ec1 SO |
1029 | /* |
1030 | * Use the initial configuration since we can't be shure that the old | |
1031 | * paths are valid. | |
1032 | */ | |
1033 | io_subchannel_init_config(sch); | |
f444cc0e SO |
1034 | if (cio_commit_config(sch)) |
1035 | return; | |
13952ec1 | 1036 | |
1da177e4 | 1037 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1038 | /* Check if this is another device which appeared on the same sch. */ |
1039 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1040 | PREPARE_WORK(&cdev->private->kick_work, | |
1041 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1042 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1043 | } else |
1044 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1045 | } |
1046 | ||
1047 | static void | |
1048 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1049 | { | |
1050 | struct subchannel *sch; | |
1051 | ||
1052 | sch = to_subchannel(cdev->dev.parent); | |
1053 | /* | |
1054 | * An interrupt in state offline means a previous disable was not | |
ed04b892 | 1055 | * successful - should not happen, but we try to disable again. |
1da177e4 LT |
1056 | */ |
1057 | cio_disable_subchannel(sch); | |
1058 | } | |
1059 | ||
1060 | static void | |
1061 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1062 | { | |
1063 | retry_set_schib(cdev); | |
1064 | cdev->private->state = DEV_STATE_ONLINE; | |
1065 | dev_fsm_event(cdev, dev_event); | |
1066 | } | |
1067 | ||
94bb0633 CH |
1068 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1069 | enum dev_event dev_event) | |
1070 | { | |
1071 | cmf_retry_copy_block(cdev); | |
1072 | cdev->private->state = DEV_STATE_ONLINE; | |
1073 | dev_fsm_event(cdev, dev_event); | |
1074 | } | |
1da177e4 LT |
1075 | |
1076 | static void | |
1077 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1078 | { | |
1079 | ccw_device_set_timeout(cdev, 0); | |
1080 | if (dev_event == DEV_EVENT_NOTOPER) | |
1081 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1082 | else | |
1083 | cdev->private->state = DEV_STATE_OFFLINE; | |
1084 | wake_up(&cdev->private->wait_q); | |
1085 | } | |
1086 | ||
1087 | static void | |
1088 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1089 | { | |
1090 | int ret; | |
1091 | ||
1092 | ret = ccw_device_cancel_halt_clear(cdev); | |
1093 | switch (ret) { | |
1094 | case 0: | |
1095 | cdev->private->state = DEV_STATE_OFFLINE; | |
1096 | wake_up(&cdev->private->wait_q); | |
1097 | break; | |
1098 | case -ENODEV: | |
1099 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1100 | wake_up(&cdev->private->wait_q); | |
1101 | break; | |
1102 | default: | |
1103 | ccw_device_set_timeout(cdev, HZ/10); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * No operation action. This is used e.g. to ignore a timeout event in | |
1109 | * state offline. | |
1110 | */ | |
1111 | static void | |
1112 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1113 | { | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Bug operation action. | |
1118 | */ | |
1119 | static void | |
1120 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1121 | { | |
139b83dd ME |
1122 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1123 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1124 | cdev->private->dev_id.ssid, | |
1125 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1126 | BUG(); |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * device statemachine | |
1131 | */ | |
1132 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1133 | [DEV_STATE_NOT_OPER] = { | |
1134 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1135 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1136 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1137 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1138 | }, | |
1139 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1140 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1141 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1142 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1143 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1144 | }, | |
1145 | [DEV_STATE_SENSE_ID] = { | |
1146 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1147 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1148 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1149 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1150 | }, | |
1151 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1152 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1153 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1154 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1155 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1156 | }, | |
1157 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1158 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1159 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1160 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1161 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1162 | }, |
1163 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1164 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1165 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1166 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1167 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1168 | }, | |
1169 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1170 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1171 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1172 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1173 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1174 | }, | |
1175 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1176 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1177 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1178 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1179 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1180 | }, | |
1181 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1182 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1183 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1184 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1185 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1186 | }, | |
1187 | /* states to wait for i/o completion before doing something */ | |
1188 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1189 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1190 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1191 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1192 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1193 | }, | |
1194 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1195 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1196 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1197 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1198 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1199 | }, | |
1da177e4 LT |
1200 | [DEV_STATE_QUIESCE] = { |
1201 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1202 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1203 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1204 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1205 | }, | |
1206 | /* special states for devices gone not operational */ | |
1207 | [DEV_STATE_DISCONNECTED] = { | |
1208 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1209 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1210 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1211 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1212 | }, |
1213 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1214 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1215 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1216 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1217 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1218 | }, | |
1219 | [DEV_STATE_CMFCHANGE] = { | |
1220 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1221 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1222 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1223 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1224 | }, | |
94bb0633 CH |
1225 | [DEV_STATE_CMFUPDATE] = { |
1226 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1227 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1228 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1229 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1230 | }, | |
1da177e4 LT |
1231 | }; |
1232 | ||
1da177e4 | 1233 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |