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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/device_fsm.c | |
3 | * finite state machine for device handling | |
4 | * | |
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); | |
a8237fc4 | 143 | ret = stsch(sch->schid, &sch->schib); |
1da177e4 LT |
144 | if (ret || !sch->schib.pmcw.dnv) |
145 | return -ENODEV; | |
2470b648 CH |
146 | if (!sch->schib.pmcw.ena) |
147 | /* Not operational -> done. */ | |
1da177e4 LT |
148 | return 0; |
149 | /* Stage 1: cancel io. */ | |
23d805b6 PO |
150 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) && |
151 | !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { | |
83262d63 PO |
152 | if (!scsw_is_tm(&sch->schib.scsw)) { |
153 | ret = cio_cancel(sch); | |
154 | if (ret != -EINVAL) | |
155 | return ret; | |
156 | } | |
157 | /* cancel io unsuccessful or not applicable (transport mode). | |
158 | * Continue with asynchronous instructions. */ | |
1da177e4 LT |
159 | cdev->private->iretry = 3; /* 3 halt retries. */ |
160 | } | |
23d805b6 | 161 | if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) { |
1da177e4 LT |
162 | /* Stage 2: halt io. */ |
163 | if (cdev->private->iretry) { | |
164 | cdev->private->iretry--; | |
165 | ret = cio_halt(sch); | |
ba4ba8a6 PO |
166 | if (ret != -EBUSY) |
167 | return (ret == 0) ? -EBUSY : ret; | |
1da177e4 LT |
168 | } |
169 | /* halt io unsuccessful. */ | |
170 | cdev->private->iretry = 255; /* 255 clear retries. */ | |
171 | } | |
172 | /* Stage 3: clear io. */ | |
173 | if (cdev->private->iretry) { | |
174 | cdev->private->iretry--; | |
175 | ret = cio_clear (sch); | |
176 | return (ret == 0) ? -EBUSY : ret; | |
177 | } | |
178 | panic("Can't stop i/o on subchannel.\n"); | |
179 | } | |
180 | ||
181 | static int | |
182 | ccw_device_handle_oper(struct ccw_device *cdev) | |
183 | { | |
184 | struct subchannel *sch; | |
185 | ||
186 | sch = to_subchannel(cdev->dev.parent); | |
187 | cdev->private->flags.recog_done = 1; | |
188 | /* | |
189 | * Check if cu type and device type still match. If | |
190 | * not, it is certainly another device and we have to | |
d7b5a4c9 | 191 | * de- and re-register. |
1da177e4 LT |
192 | */ |
193 | if (cdev->id.cu_type != cdev->private->senseid.cu_type || | |
194 | cdev->id.cu_model != cdev->private->senseid.cu_model || | |
195 | cdev->id.dev_type != cdev->private->senseid.dev_type || | |
d7b5a4c9 | 196 | cdev->id.dev_model != cdev->private->senseid.dev_model) { |
1da177e4 | 197 | PREPARE_WORK(&cdev->private->kick_work, |
c1637532 | 198 | ccw_device_do_unreg_rereg); |
1da177e4 LT |
199 | queue_work(ccw_device_work, &cdev->private->kick_work); |
200 | return 0; | |
201 | } | |
202 | cdev->private->flags.donotify = 1; | |
203 | return 1; | |
204 | } | |
205 | ||
206 | /* | |
207 | * The machine won't give us any notification by machine check if a chpid has | |
208 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
209 | * the channel subsystem to device selection and updating our path masks). | |
210 | */ | |
4d284cac | 211 | static void |
1da177e4 LT |
212 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
213 | { | |
214 | int mask, i; | |
f86635fa | 215 | struct chp_id chpid; |
1da177e4 | 216 | |
f86635fa | 217 | chp_id_init(&chpid); |
1da177e4 LT |
218 | for (i = 0; i<8; i++) { |
219 | mask = 0x80 >> i; | |
220 | if (!(sch->lpm & mask)) | |
221 | continue; | |
222 | if (old_lpm & mask) | |
223 | continue; | |
f86635fa | 224 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
225 | if (!chp_is_registered(chpid)) |
226 | css_schedule_eval_all(); | |
1da177e4 LT |
227 | } |
228 | } | |
229 | ||
230 | /* | |
231 | * Stop device recognition. | |
232 | */ | |
233 | static void | |
234 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
235 | { | |
236 | struct subchannel *sch; | |
237 | int notify, old_lpm, same_dev; | |
238 | ||
239 | sch = to_subchannel(cdev->dev.parent); | |
240 | ||
241 | ccw_device_set_timeout(cdev, 0); | |
242 | cio_disable_subchannel(sch); | |
243 | /* | |
244 | * Now that we tried recognition, we have performed device selection | |
245 | * through ssch() and the path information is up to date. | |
246 | */ | |
247 | old_lpm = sch->lpm; | |
a8237fc4 | 248 | stsch(sch->schid, &sch->schib); |
28bdc6f6 | 249 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
4ffa9234 CH |
250 | /* Check since device may again have become not operational. */ |
251 | if (!sch->schib.pmcw.dnv) | |
252 | state = DEV_STATE_NOT_OPER; | |
1da177e4 LT |
253 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
254 | /* Force reprobe on all chpids. */ | |
255 | old_lpm = 0; | |
256 | if (sch->lpm != old_lpm) | |
257 | __recover_lost_chpids(sch, old_lpm); | |
258 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
259 | if (state == DEV_STATE_NOT_OPER) { | |
260 | cdev->private->flags.recog_done = 1; | |
261 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
262 | return; | |
263 | } | |
264 | /* Boxed devices don't need extra treatment. */ | |
265 | } | |
266 | notify = 0; | |
267 | same_dev = 0; /* Keep the compiler quiet... */ | |
268 | switch (state) { | |
269 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
270 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
271 | "subchannel 0.%x.%04x\n", | |
272 | cdev->private->dev_id.devno, | |
273 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
274 | break; |
275 | case DEV_STATE_OFFLINE: | |
276 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) { | |
277 | same_dev = ccw_device_handle_oper(cdev); | |
278 | notify = 1; | |
279 | } | |
280 | /* fill out sense information */ | |
81388d2a | 281 | memset(&cdev->id, 0, sizeof(cdev->id)); |
292888c8 HC |
282 | cdev->id.cu_type = cdev->private->senseid.cu_type; |
283 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
284 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
285 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
1da177e4 LT |
286 | if (notify) { |
287 | cdev->private->state = DEV_STATE_OFFLINE; | |
288 | if (same_dev) { | |
289 | /* Get device online again. */ | |
290 | ccw_device_online(cdev); | |
291 | wake_up(&cdev->private->wait_q); | |
292 | } | |
293 | return; | |
294 | } | |
295 | /* Issue device info message. */ | |
139b83dd ME |
296 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " |
297 | "CU Type/Mod = %04X/%02X, Dev Type/Mod = " | |
298 | "%04X/%02X\n", | |
299 | cdev->private->dev_id.ssid, | |
300 | cdev->private->dev_id.devno, | |
301 | cdev->id.cu_type, cdev->id.cu_model, | |
302 | cdev->id.dev_type, cdev->id.dev_model); | |
1da177e4 LT |
303 | break; |
304 | case DEV_STATE_BOXED: | |
139b83dd ME |
305 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
306 | " subchannel 0.%x.%04x\n", | |
307 | cdev->private->dev_id.devno, | |
308 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
309 | break; |
310 | } | |
311 | cdev->private->state = state; | |
312 | io_subchannel_recog_done(cdev); | |
313 | if (state != DEV_STATE_NOT_OPER) | |
314 | wake_up(&cdev->private->wait_q); | |
315 | } | |
316 | ||
317 | /* | |
318 | * Function called from device_id.c after sense id has completed. | |
319 | */ | |
320 | void | |
321 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
322 | { | |
323 | switch (err) { | |
324 | case 0: | |
325 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
326 | break; | |
327 | case -ETIME: /* Sense id stopped by timeout. */ | |
328 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
329 | break; | |
330 | default: | |
331 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
332 | break; | |
333 | } | |
334 | } | |
335 | ||
c820de39 CH |
336 | int ccw_device_notify(struct ccw_device *cdev, int event) |
337 | { | |
338 | if (!cdev->drv) | |
339 | return 0; | |
340 | if (!cdev->online) | |
341 | return 0; | |
91c36919 PO |
342 | CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", |
343 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
344 | event); | |
c820de39 CH |
345 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
346 | } | |
347 | ||
91c36919 | 348 | static void cmf_reenable_delayed(struct work_struct *work) |
1da177e4 | 349 | { |
c1637532 | 350 | struct ccw_device_private *priv; |
1da177e4 | 351 | struct ccw_device *cdev; |
1da177e4 | 352 | |
c1637532 MS |
353 | priv = container_of(work, struct ccw_device_private, kick_work); |
354 | cdev = priv->cdev; | |
91c36919 PO |
355 | cmf_reenable(cdev); |
356 | } | |
357 | ||
358 | static void ccw_device_oper_notify(struct ccw_device *cdev) | |
359 | { | |
360 | if (ccw_device_notify(cdev, CIO_OPER)) { | |
94bb0633 | 361 | /* Reenable channel measurements, if needed. */ |
91c36919 PO |
362 | PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed); |
363 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
364 | return; | |
365 | } | |
366 | /* Driver doesn't want device back. */ | |
367 | ccw_device_set_notoper(cdev); | |
368 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unreg_rereg); | |
369 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1da177e4 LT |
370 | } |
371 | ||
372 | /* | |
373 | * Finished with online/offline processing. | |
374 | */ | |
375 | static void | |
376 | ccw_device_done(struct ccw_device *cdev, int state) | |
377 | { | |
378 | struct subchannel *sch; | |
379 | ||
380 | sch = to_subchannel(cdev->dev.parent); | |
381 | ||
f1ee3281 CH |
382 | ccw_device_set_timeout(cdev, 0); |
383 | ||
1da177e4 LT |
384 | if (state != DEV_STATE_ONLINE) |
385 | cio_disable_subchannel(sch); | |
386 | ||
387 | /* Reset device status. */ | |
388 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
389 | ||
390 | cdev->private->state = state; | |
391 | ||
392 | ||
393 | if (state == DEV_STATE_BOXED) | |
139b83dd ME |
394 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
395 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
1da177e4 LT |
396 | |
397 | if (cdev->private->flags.donotify) { | |
398 | cdev->private->flags.donotify = 0; | |
91c36919 | 399 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
400 | } |
401 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
402 | } |
403 | ||
4d284cac | 404 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
405 | { |
406 | char *c1; | |
407 | char *c2; | |
408 | ||
409 | c1 = (char *)p1; | |
410 | c2 = (char *)p2; | |
411 | ||
412 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
413 | } | |
414 | ||
415 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
416 | { | |
417 | int i; | |
418 | int last; | |
419 | ||
420 | last = 0; | |
421 | for (i = 0; i < 8; i++) { | |
422 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
423 | /* No PGID yet */ | |
424 | continue; | |
425 | if (cdev->private->pgid[last].inf.ps.state1 == | |
426 | SNID_STATE1_RESET) { | |
427 | /* First non-zero PGID */ | |
428 | last = i; | |
429 | continue; | |
430 | } | |
431 | if (cmp_pgid(&cdev->private->pgid[i], | |
432 | &cdev->private->pgid[last]) == 0) | |
433 | /* Non-conflicting PGIDs */ | |
434 | continue; | |
435 | ||
436 | /* PGID mismatch, can't pathgroup. */ | |
437 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
438 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
439 | cdev->private->dev_id.ssid, |
440 | cdev->private->dev_id.devno); | |
7e560814 CH |
441 | cdev->private->options.pgroup = 0; |
442 | return; | |
443 | } | |
444 | if (cdev->private->pgid[last].inf.ps.state1 == | |
445 | SNID_STATE1_RESET) | |
446 | /* No previous pgid found */ | |
7c9f4e3a CH |
447 | memcpy(&cdev->private->pgid[0], |
448 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
449 | sizeof(struct pgid)); |
450 | else | |
451 | /* Use existing pgid */ | |
452 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
453 | sizeof(struct pgid)); | |
454 | } | |
455 | ||
1da177e4 LT |
456 | /* |
457 | * Function called from device_pgid.c after sense path ground has completed. | |
458 | */ | |
459 | void | |
460 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
461 | { | |
462 | struct subchannel *sch; | |
463 | ||
464 | sch = to_subchannel(cdev->dev.parent); | |
465 | switch (err) { | |
7e560814 CH |
466 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
467 | cdev->private->options.pgroup = 0; | |
468 | break; | |
469 | case 0: /* success */ | |
470 | case -EACCES: /* partial success, some paths not operational */ | |
471 | /* Check if all pgids are equal or 0. */ | |
472 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
473 | break; |
474 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
475 | case -EUSERS: /* device is reserved for someone else. */ | |
476 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 477 | return; |
1da177e4 LT |
478 | default: |
479 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 480 | return; |
1da177e4 | 481 | } |
7e560814 | 482 | /* Start Path Group verification. */ |
7e560814 | 483 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 484 | cdev->private->flags.doverify = 0; |
7e560814 | 485 | ccw_device_verify_start(cdev); |
1da177e4 LT |
486 | } |
487 | ||
488 | /* | |
489 | * Start device recognition. | |
490 | */ | |
491 | int | |
492 | ccw_device_recognition(struct ccw_device *cdev) | |
493 | { | |
494 | struct subchannel *sch; | |
495 | int ret; | |
496 | ||
497 | if ((cdev->private->state != DEV_STATE_NOT_OPER) && | |
498 | (cdev->private->state != DEV_STATE_BOXED)) | |
499 | return -EINVAL; | |
500 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 501 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
502 | if (ret != 0) |
503 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
504 | return ret; | |
505 | ||
506 | /* After 60s the device recognition is considered to have failed. */ | |
507 | ccw_device_set_timeout(cdev, 60*HZ); | |
508 | ||
509 | /* | |
510 | * We used to start here with a sense pgid to find out whether a device | |
511 | * is locked by someone else. Unfortunately, the sense pgid command | |
512 | * code has other meanings on devices predating the path grouping | |
513 | * algorithm, so we start with sense id and box the device after an | |
514 | * timeout (or if sense pgid during path verification detects the device | |
515 | * is locked, as may happen on newer devices). | |
516 | */ | |
517 | cdev->private->flags.recog_done = 0; | |
518 | cdev->private->state = DEV_STATE_SENSE_ID; | |
519 | ccw_device_sense_id_start(cdev); | |
520 | return 0; | |
521 | } | |
522 | ||
523 | /* | |
524 | * Handle timeout in device recognition. | |
525 | */ | |
526 | static void | |
527 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
528 | { | |
529 | int ret; | |
530 | ||
531 | ret = ccw_device_cancel_halt_clear(cdev); | |
532 | switch (ret) { | |
533 | case 0: | |
534 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
535 | break; | |
536 | case -ENODEV: | |
537 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
538 | break; | |
539 | default: | |
540 | ccw_device_set_timeout(cdev, 3*HZ); | |
541 | } | |
542 | } | |
543 | ||
544 | ||
1da177e4 LT |
545 | void |
546 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
547 | { | |
28bdc6f6 PO |
548 | struct subchannel *sch; |
549 | ||
550 | sch = to_subchannel(cdev->dev.parent); | |
551 | /* Update schib - pom may have changed. */ | |
552 | stsch(sch->schid, &sch->schib); | |
553 | /* Update lpm with verified path mask. */ | |
554 | sch->lpm = sch->vpm; | |
555 | /* Repeat path verification? */ | |
556 | if (cdev->private->flags.doverify) { | |
557 | cdev->private->flags.doverify = 0; | |
558 | ccw_device_verify_start(cdev); | |
559 | return; | |
560 | } | |
1da177e4 LT |
561 | switch (err) { |
562 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
563 | cdev->private->options.pgroup = 0; | |
564 | case 0: | |
565 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
566 | /* Deliver fake irb to device driver, if needed. */ | |
567 | if (cdev->private->flags.fake_irb) { | |
568 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
569 | cdev->private->irb.scsw.cmd.cc = 1; |
570 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
571 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
572 | cdev->private->irb.scsw.cmd.stctl = | |
573 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
574 | cdev->private->flags.fake_irb = 0; |
575 | if (cdev->handler) | |
576 | cdev->handler(cdev, cdev->private->intparm, | |
577 | &cdev->private->irb); | |
578 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
579 | } | |
580 | break; | |
581 | case -ETIME: | |
8b42f5c2 PO |
582 | /* Reset oper notify indication after verify error. */ |
583 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
584 | ccw_device_done(cdev, DEV_STATE_BOXED); |
585 | break; | |
586 | default: | |
8b42f5c2 PO |
587 | /* Reset oper notify indication after verify error. */ |
588 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
589 | if (cdev->online) { |
590 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 591 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 592 | } else |
ee04bbcc | 593 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
594 | break; |
595 | } | |
596 | } | |
597 | ||
598 | /* | |
599 | * Get device online. | |
600 | */ | |
601 | int | |
602 | ccw_device_online(struct ccw_device *cdev) | |
603 | { | |
604 | struct subchannel *sch; | |
605 | int ret; | |
606 | ||
607 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
608 | (cdev->private->state != DEV_STATE_BOXED)) | |
609 | return -EINVAL; | |
610 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 611 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
612 | if (ret != 0) { |
613 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
614 | if (ret == -ENODEV) | |
615 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
616 | return ret; | |
617 | } | |
618 | /* Do we want to do path grouping? */ | |
619 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
620 | /* Start initial path verification. */ |
621 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 622 | cdev->private->flags.doverify = 0; |
7e560814 | 623 | ccw_device_verify_start(cdev); |
1da177e4 LT |
624 | return 0; |
625 | } | |
626 | /* Do a SensePGID first. */ | |
627 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
628 | ccw_device_sense_pgid_start(cdev); | |
629 | return 0; | |
630 | } | |
631 | ||
632 | void | |
633 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
634 | { | |
635 | switch (err) { | |
636 | case 0: | |
637 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
638 | break; | |
639 | case -ETIME: | |
640 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
641 | break; | |
642 | default: | |
3ecb0a5a | 643 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 644 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
645 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
646 | break; | |
647 | } | |
648 | } | |
649 | ||
650 | /* | |
651 | * Shutdown device. | |
652 | */ | |
653 | int | |
654 | ccw_device_offline(struct ccw_device *cdev) | |
655 | { | |
656 | struct subchannel *sch; | |
657 | ||
b301ea8c PO |
658 | /* Allow ccw_device_offline while disconnected. */ |
659 | if (cdev->private->state == DEV_STATE_DISCONNECTED || | |
660 | cdev->private->state == DEV_STATE_NOT_OPER) { | |
661 | cdev->private->flags.donotify = 0; | |
662 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
663 | return 0; | |
664 | } | |
d7b5a4c9 CH |
665 | if (ccw_device_is_orphan(cdev)) { |
666 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
667 | return 0; | |
668 | } | |
1da177e4 | 669 | sch = to_subchannel(cdev->dev.parent); |
a8237fc4 | 670 | if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv) |
1da177e4 | 671 | return -ENODEV; |
23d805b6 | 672 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 673 | return -EBUSY; |
23d805b6 PO |
674 | if (cdev->private->state != DEV_STATE_ONLINE) |
675 | return -EINVAL; | |
1da177e4 LT |
676 | /* Are we doing path grouping? */ |
677 | if (!cdev->private->options.pgroup) { | |
678 | /* No, set state offline immediately. */ | |
679 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
680 | return 0; | |
681 | } | |
682 | /* Start Set Path Group commands. */ | |
683 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
684 | ccw_device_disband_start(cdev); | |
685 | return 0; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Handle timeout in device online/offline process. | |
690 | */ | |
691 | static void | |
692 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
693 | { | |
694 | int ret; | |
695 | ||
696 | ret = ccw_device_cancel_halt_clear(cdev); | |
697 | switch (ret) { | |
698 | case 0: | |
699 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
700 | break; | |
701 | case -ENODEV: | |
702 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
703 | break; | |
704 | default: | |
705 | ccw_device_set_timeout(cdev, 3*HZ); | |
706 | } | |
707 | } | |
708 | ||
709 | /* | |
710 | * Handle not oper event in device recognition. | |
711 | */ | |
712 | static void | |
713 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
714 | { | |
715 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
716 | } | |
717 | ||
718 | /* | |
3f4cf6e7 | 719 | * Handle not operational event in non-special state. |
1da177e4 | 720 | */ |
3f4cf6e7 CH |
721 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
722 | enum dev_event dev_event) | |
1da177e4 LT |
723 | { |
724 | struct subchannel *sch; | |
725 | ||
726 | cdev->private->state = DEV_STATE_NOT_OPER; | |
727 | sch = to_subchannel(cdev->dev.parent); | |
3f4cf6e7 | 728 | css_schedule_eval(sch->schid); |
1da177e4 LT |
729 | } |
730 | ||
731 | /* | |
732 | * Handle path verification event. | |
733 | */ | |
734 | static void | |
735 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
736 | { | |
737 | struct subchannel *sch; | |
738 | ||
1da177e4 LT |
739 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
740 | cdev->private->flags.doverify = 1; | |
741 | return; | |
742 | } | |
743 | sch = to_subchannel(cdev->dev.parent); | |
744 | /* | |
745 | * Since we might not just be coming from an interrupt from the | |
746 | * subchannel we have to update the schib. | |
747 | */ | |
a8237fc4 | 748 | stsch(sch->schid, &sch->schib); |
1da177e4 | 749 | |
23d805b6 PO |
750 | if (scsw_actl(&sch->schib.scsw) != 0 || |
751 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
752 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
753 | /* |
754 | * No final status yet or final status not yet delivered | |
755 | * to the device driver. Can't do path verfication now, | |
756 | * delay until final status was delivered. | |
757 | */ | |
758 | cdev->private->flags.doverify = 1; | |
759 | return; | |
760 | } | |
761 | /* Device is idle, we can do the path verification. */ | |
762 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 763 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
764 | ccw_device_verify_start(cdev); |
765 | } | |
766 | ||
767 | /* | |
768 | * Got an interrupt for a normal io (state online). | |
769 | */ | |
770 | static void | |
771 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
772 | { | |
773 | struct irb *irb; | |
83262d63 | 774 | int is_cmd; |
1da177e4 LT |
775 | |
776 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 777 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 778 | /* Check for unsolicited interrupt. */ |
23d805b6 | 779 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 780 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
781 | !irb->esw.esw0.erw.cons) { |
782 | /* Unit check but no sense data. Need basic sense. */ | |
783 | if (ccw_device_do_sense(cdev, irb) != 0) | |
784 | goto call_handler_unsol; | |
e0ec5749 | 785 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
786 | cdev->private->state = DEV_STATE_W4SENSE; |
787 | cdev->private->intparm = 0; | |
788 | return; | |
789 | } | |
790 | call_handler_unsol: | |
791 | if (cdev->handler) | |
792 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
793 | if (cdev->private->flags.doverify) |
794 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
795 | return; |
796 | } | |
797 | /* Accumulate status and find out if a basic sense is needed. */ | |
798 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 799 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
800 | if (ccw_device_do_sense(cdev, irb) == 0) { |
801 | cdev->private->state = DEV_STATE_W4SENSE; | |
802 | } | |
803 | return; | |
804 | } | |
805 | /* Call the handler. */ | |
806 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
807 | /* Start delayed path verification. */ | |
808 | ccw_device_online_verify(cdev, 0); | |
809 | } | |
810 | ||
811 | /* | |
812 | * Got an timeout in online state. | |
813 | */ | |
814 | static void | |
815 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
816 | { | |
817 | int ret; | |
818 | ||
819 | ccw_device_set_timeout(cdev, 0); | |
820 | ret = ccw_device_cancel_halt_clear(cdev); | |
821 | if (ret == -EBUSY) { | |
822 | ccw_device_set_timeout(cdev, 3*HZ); | |
823 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
824 | return; | |
825 | } | |
3f4cf6e7 CH |
826 | if (ret == -ENODEV) |
827 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
828 | else if (cdev->handler) | |
1da177e4 LT |
829 | cdev->handler(cdev, cdev->private->intparm, |
830 | ERR_PTR(-ETIMEDOUT)); | |
831 | } | |
832 | ||
833 | /* | |
834 | * Got an interrupt for a basic sense. | |
835 | */ | |
2b67fc46 | 836 | static void |
1da177e4 LT |
837 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
838 | { | |
839 | struct irb *irb; | |
840 | ||
841 | irb = (struct irb *) __LC_IRB; | |
842 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
843 | if (scsw_stctl(&irb->scsw) == |
844 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
845 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
846 | /* Basic sense hasn't started. Try again. */ |
847 | ccw_device_do_sense(cdev, irb); | |
848 | else { | |
139b83dd | 849 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
850 | "interrupt during w4sense...\n", |
851 | cdev->private->dev_id.ssid, | |
852 | cdev->private->dev_id.devno); | |
1da177e4 LT |
853 | if (cdev->handler) |
854 | cdev->handler (cdev, 0, irb); | |
855 | } | |
856 | return; | |
857 | } | |
3ba1998e CH |
858 | /* |
859 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
860 | * only deliver the halt/clear interrupt to the device driver as if it | |
861 | * had killed the original request. | |
862 | */ | |
23d805b6 PO |
863 | if (scsw_fctl(&irb->scsw) & |
864 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
865 | /* Retry Basic Sense if requested. */ |
866 | if (cdev->private->flags.intretry) { | |
867 | cdev->private->flags.intretry = 0; | |
868 | ccw_device_do_sense(cdev, irb); | |
869 | return; | |
870 | } | |
3ba1998e CH |
871 | cdev->private->flags.dosense = 0; |
872 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
873 | ccw_device_accumulate_irb(cdev, irb); | |
874 | goto call_handler; | |
875 | } | |
1da177e4 LT |
876 | /* Add basic sense info to irb. */ |
877 | ccw_device_accumulate_basic_sense(cdev, irb); | |
878 | if (cdev->private->flags.dosense) { | |
879 | /* Another basic sense is needed. */ | |
880 | ccw_device_do_sense(cdev, irb); | |
881 | return; | |
882 | } | |
3ba1998e | 883 | call_handler: |
1da177e4 LT |
884 | cdev->private->state = DEV_STATE_ONLINE; |
885 | /* Call the handler. */ | |
886 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
887 | /* Start delayed path verification. */ | |
888 | ccw_device_online_verify(cdev, 0); | |
889 | } | |
890 | ||
891 | static void | |
892 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
893 | { | |
894 | struct irb *irb; | |
895 | ||
896 | irb = (struct irb *) __LC_IRB; | |
897 | /* Accumulate status. We don't do basic sense. */ | |
898 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
899 | /* Remember to clear irb to avoid residuals. */ |
900 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
901 | /* Try to start delayed device verification. */ |
902 | ccw_device_online_verify(cdev, 0); | |
903 | /* Note: Don't call handler for cio initiated clear! */ | |
904 | } | |
905 | ||
906 | static void | |
907 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
908 | { | |
909 | struct subchannel *sch; | |
910 | ||
911 | sch = to_subchannel(cdev->dev.parent); | |
912 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
913 | /* Start delayed path verification. */ |
914 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 915 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
916 | if (cdev->handler) |
917 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 918 | ERR_PTR(-EIO)); |
1da177e4 LT |
919 | } |
920 | ||
921 | static void | |
922 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
923 | { | |
924 | int ret; | |
925 | ||
926 | ret = ccw_device_cancel_halt_clear(cdev); | |
927 | if (ret == -EBUSY) { | |
928 | ccw_device_set_timeout(cdev, 3*HZ); | |
929 | return; | |
930 | } | |
7c8427c3 CH |
931 | /* Start delayed path verification. */ |
932 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
933 | if (cdev->handler) |
934 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 935 | ERR_PTR(-EIO)); |
1da177e4 LT |
936 | } |
937 | ||
c820de39 | 938 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
939 | { |
940 | int ret; | |
1da177e4 | 941 | |
1da177e4 LT |
942 | ret = ccw_device_cancel_halt_clear(cdev); |
943 | if (ret == -EBUSY) { | |
944 | ccw_device_set_timeout(cdev, 3*HZ); | |
945 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
946 | return; | |
947 | } | |
7c8427c3 CH |
948 | /* Start delayed path verification. */ |
949 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
950 | if (cdev->handler) |
951 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 952 | ERR_PTR(-EIO)); |
1da177e4 LT |
953 | } |
954 | ||
955 | static void | |
28bdc6f6 | 956 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 957 | { |
28bdc6f6 | 958 | /* Start verification after current task finished. */ |
7e560814 | 959 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
960 | } |
961 | ||
962 | static void | |
963 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
964 | { | |
965 | struct irb *irb; | |
966 | ||
967 | switch (dev_event) { | |
968 | case DEV_EVENT_INTERRUPT: | |
969 | irb = (struct irb *) __LC_IRB; | |
970 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 971 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 972 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 973 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
974 | /* FIXME: we should restart stlck here, but this |
975 | * is extremely unlikely ... */ | |
976 | goto out_wakeup; | |
977 | ||
978 | ccw_device_accumulate_irb(cdev, irb); | |
979 | /* We don't care about basic sense etc. */ | |
980 | break; | |
981 | default: /* timeout */ | |
982 | break; | |
983 | } | |
984 | out_wakeup: | |
985 | wake_up(&cdev->private->wait_q); | |
986 | } | |
987 | ||
988 | static void | |
989 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
990 | { | |
991 | struct subchannel *sch; | |
992 | ||
993 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 994 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
995 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
996 | return; | |
997 | ||
998 | /* After 60s the device recognition is considered to have failed. */ | |
999 | ccw_device_set_timeout(cdev, 60*HZ); | |
1000 | ||
1001 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1002 | ccw_device_sense_id_start(cdev); | |
1003 | } | |
1004 | ||
c820de39 | 1005 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1006 | { |
c820de39 | 1007 | struct subchannel *sch; |
1da177e4 | 1008 | |
1da177e4 LT |
1009 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1010 | return; | |
1011 | ||
c820de39 | 1012 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1013 | /* Update some values. */ |
a8237fc4 | 1014 | if (stsch(sch->schid, &sch->schib)) |
1da177e4 | 1015 | return; |
7674da77 CH |
1016 | if (!sch->schib.pmcw.dnv) |
1017 | return; | |
1da177e4 LT |
1018 | /* |
1019 | * The pim, pam, pom values may not be accurate, but they are the best | |
1020 | * we have before performing device selection :/ | |
1021 | */ | |
28bdc6f6 | 1022 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
1da177e4 | 1023 | /* Re-set some bits in the pmcw that were lost. */ |
1da177e4 LT |
1024 | sch->schib.pmcw.csense = 1; |
1025 | sch->schib.pmcw.ena = 0; | |
1026 | if ((sch->lpm & (sch->lpm - 1)) != 0) | |
1027 | sch->schib.pmcw.mp = 1; | |
1da177e4 | 1028 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1029 | /* Check if this is another device which appeared on the same sch. */ |
1030 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1031 | PREPARE_WORK(&cdev->private->kick_work, | |
1032 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1033 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1034 | } else |
1035 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | static void | |
1039 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1040 | { | |
1041 | struct subchannel *sch; | |
1042 | ||
1043 | sch = to_subchannel(cdev->dev.parent); | |
1044 | /* | |
1045 | * An interrupt in state offline means a previous disable was not | |
1046 | * successful. Try again. | |
1047 | */ | |
1048 | cio_disable_subchannel(sch); | |
1049 | } | |
1050 | ||
1051 | static void | |
1052 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1053 | { | |
1054 | retry_set_schib(cdev); | |
1055 | cdev->private->state = DEV_STATE_ONLINE; | |
1056 | dev_fsm_event(cdev, dev_event); | |
1057 | } | |
1058 | ||
94bb0633 CH |
1059 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1060 | enum dev_event dev_event) | |
1061 | { | |
1062 | cmf_retry_copy_block(cdev); | |
1063 | cdev->private->state = DEV_STATE_ONLINE; | |
1064 | dev_fsm_event(cdev, dev_event); | |
1065 | } | |
1da177e4 LT |
1066 | |
1067 | static void | |
1068 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1069 | { | |
1070 | ccw_device_set_timeout(cdev, 0); | |
1071 | if (dev_event == DEV_EVENT_NOTOPER) | |
1072 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1073 | else | |
1074 | cdev->private->state = DEV_STATE_OFFLINE; | |
1075 | wake_up(&cdev->private->wait_q); | |
1076 | } | |
1077 | ||
1078 | static void | |
1079 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1080 | { | |
1081 | int ret; | |
1082 | ||
1083 | ret = ccw_device_cancel_halt_clear(cdev); | |
1084 | switch (ret) { | |
1085 | case 0: | |
1086 | cdev->private->state = DEV_STATE_OFFLINE; | |
1087 | wake_up(&cdev->private->wait_q); | |
1088 | break; | |
1089 | case -ENODEV: | |
1090 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1091 | wake_up(&cdev->private->wait_q); | |
1092 | break; | |
1093 | default: | |
1094 | ccw_device_set_timeout(cdev, HZ/10); | |
1095 | } | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * No operation action. This is used e.g. to ignore a timeout event in | |
1100 | * state offline. | |
1101 | */ | |
1102 | static void | |
1103 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1104 | { | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Bug operation action. | |
1109 | */ | |
1110 | static void | |
1111 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1112 | { | |
139b83dd ME |
1113 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1114 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1115 | cdev->private->dev_id.ssid, | |
1116 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1117 | BUG(); |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * device statemachine | |
1122 | */ | |
1123 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1124 | [DEV_STATE_NOT_OPER] = { | |
1125 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1126 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1127 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1128 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1129 | }, | |
1130 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1131 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1132 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1133 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1134 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1135 | }, | |
1136 | [DEV_STATE_SENSE_ID] = { | |
1137 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1138 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1139 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1140 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1141 | }, | |
1142 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1143 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1144 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1145 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1146 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1147 | }, | |
1148 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1149 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1150 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1151 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1152 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1153 | }, |
1154 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1155 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1156 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1157 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1158 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1159 | }, | |
1160 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1161 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1162 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1163 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1164 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1165 | }, | |
1166 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1167 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1168 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1169 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1170 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1171 | }, | |
1172 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1173 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1174 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1175 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1176 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1177 | }, | |
1178 | /* states to wait for i/o completion before doing something */ | |
1179 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1180 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1181 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1182 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1183 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1184 | }, | |
1185 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1186 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1187 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1188 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1189 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1190 | }, | |
1da177e4 LT |
1191 | [DEV_STATE_QUIESCE] = { |
1192 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1193 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1194 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1195 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1196 | }, | |
1197 | /* special states for devices gone not operational */ | |
1198 | [DEV_STATE_DISCONNECTED] = { | |
1199 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1200 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1201 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1202 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1203 | }, |
1204 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1205 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1206 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1207 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1208 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1209 | }, | |
1210 | [DEV_STATE_CMFCHANGE] = { | |
1211 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1212 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1213 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1214 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1215 | }, | |
94bb0633 CH |
1216 | [DEV_STATE_CMFUPDATE] = { |
1217 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1218 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1219 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1220 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1221 | }, | |
1da177e4 LT |
1222 | }; |
1223 | ||
1da177e4 | 1224 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |