]>
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 | ||
823d494a | 180 | void ccw_device_update_sense_data(struct ccw_device *cdev) |
1da177e4 | 181 | { |
823d494a SO |
182 | memset(&cdev->id, 0, sizeof(cdev->id)); |
183 | cdev->id.cu_type = cdev->private->senseid.cu_type; | |
184 | cdev->id.cu_model = cdev->private->senseid.cu_model; | |
185 | cdev->id.dev_type = cdev->private->senseid.dev_type; | |
186 | cdev->id.dev_model = cdev->private->senseid.dev_model; | |
187 | } | |
1da177e4 | 188 | |
823d494a SO |
189 | int ccw_device_test_sense_data(struct ccw_device *cdev) |
190 | { | |
191 | return cdev->id.cu_type == cdev->private->senseid.cu_type && | |
192 | cdev->id.cu_model == cdev->private->senseid.cu_model && | |
193 | cdev->id.dev_type == cdev->private->senseid.dev_type && | |
194 | cdev->id.dev_model == cdev->private->senseid.dev_model; | |
1da177e4 LT |
195 | } |
196 | ||
197 | /* | |
198 | * The machine won't give us any notification by machine check if a chpid has | |
199 | * been varied online on the SE so we have to find out by magic (i. e. driving | |
200 | * the channel subsystem to device selection and updating our path masks). | |
201 | */ | |
4d284cac | 202 | static void |
1da177e4 LT |
203 | __recover_lost_chpids(struct subchannel *sch, int old_lpm) |
204 | { | |
205 | int mask, i; | |
f86635fa | 206 | struct chp_id chpid; |
1da177e4 | 207 | |
f86635fa | 208 | chp_id_init(&chpid); |
1da177e4 LT |
209 | for (i = 0; i<8; i++) { |
210 | mask = 0x80 >> i; | |
211 | if (!(sch->lpm & mask)) | |
212 | continue; | |
213 | if (old_lpm & mask) | |
214 | continue; | |
f86635fa | 215 | chpid.id = sch->schib.pmcw.chpid[i]; |
83b3370c PO |
216 | if (!chp_is_registered(chpid)) |
217 | css_schedule_eval_all(); | |
1da177e4 LT |
218 | } |
219 | } | |
220 | ||
221 | /* | |
222 | * Stop device recognition. | |
223 | */ | |
224 | static void | |
225 | ccw_device_recog_done(struct ccw_device *cdev, int state) | |
226 | { | |
227 | struct subchannel *sch; | |
823d494a | 228 | int old_lpm; |
1da177e4 LT |
229 | |
230 | sch = to_subchannel(cdev->dev.parent); | |
231 | ||
232 | ccw_device_set_timeout(cdev, 0); | |
233 | cio_disable_subchannel(sch); | |
234 | /* | |
235 | * Now that we tried recognition, we have performed device selection | |
236 | * through ssch() and the path information is up to date. | |
237 | */ | |
238 | old_lpm = sch->lpm; | |
cdb912a4 | 239 | |
4ffa9234 | 240 | /* Check since device may again have become not operational. */ |
cdb912a4 | 241 | if (cio_update_schib(sch)) |
4ffa9234 | 242 | state = DEV_STATE_NOT_OPER; |
cdb912a4 SO |
243 | else |
244 | sch->lpm = sch->schib.pmcw.pam & sch->opm; | |
245 | ||
1da177e4 LT |
246 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) |
247 | /* Force reprobe on all chpids. */ | |
248 | old_lpm = 0; | |
249 | if (sch->lpm != old_lpm) | |
250 | __recover_lost_chpids(sch, old_lpm); | |
47593bfa SO |
251 | if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID && |
252 | (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) { | |
253 | cdev->private->flags.recog_done = 1; | |
254 | cdev->private->state = DEV_STATE_DISCONNECTED; | |
255 | wake_up(&cdev->private->wait_q); | |
256 | return; | |
1da177e4 | 257 | } |
823d494a SO |
258 | if (cdev->private->flags.resuming) { |
259 | cdev->private->state = state; | |
260 | cdev->private->flags.recog_done = 1; | |
261 | wake_up(&cdev->private->wait_q); | |
262 | return; | |
263 | } | |
1da177e4 LT |
264 | switch (state) { |
265 | case DEV_STATE_NOT_OPER: | |
139b83dd ME |
266 | CIO_MSG_EVENT(2, "SenseID : unknown device %04x on " |
267 | "subchannel 0.%x.%04x\n", | |
268 | cdev->private->dev_id.devno, | |
269 | sch->schid.ssid, sch->schid.sch_no); | |
1da177e4 LT |
270 | break; |
271 | case DEV_STATE_OFFLINE: | |
823d494a SO |
272 | if (!cdev->online) { |
273 | ccw_device_update_sense_data(cdev); | |
274 | /* Issue device info message. */ | |
275 | CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: " | |
276 | "CU Type/Mod = %04X/%02X, Dev Type/Mod " | |
277 | "= %04X/%02X\n", | |
278 | cdev->private->dev_id.ssid, | |
279 | cdev->private->dev_id.devno, | |
280 | cdev->id.cu_type, cdev->id.cu_model, | |
281 | cdev->id.dev_type, cdev->id.dev_model); | |
282 | break; | |
1da177e4 | 283 | } |
823d494a SO |
284 | cdev->private->state = DEV_STATE_OFFLINE; |
285 | cdev->private->flags.recog_done = 1; | |
286 | if (ccw_device_test_sense_data(cdev)) { | |
287 | cdev->private->flags.donotify = 1; | |
288 | ccw_device_online(cdev); | |
289 | wake_up(&cdev->private->wait_q); | |
290 | } else { | |
291 | ccw_device_update_sense_data(cdev); | |
292 | PREPARE_WORK(&cdev->private->kick_work, | |
293 | ccw_device_do_unbind_bind); | |
294 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
1da177e4 | 295 | } |
823d494a | 296 | return; |
1da177e4 | 297 | case DEV_STATE_BOXED: |
139b83dd ME |
298 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
299 | " subchannel 0.%x.%04x\n", | |
300 | cdev->private->dev_id.devno, | |
301 | sch->schid.ssid, sch->schid.sch_no); | |
47593bfa SO |
302 | if (cdev->id.cu_type != 0) { /* device was recognized before */ |
303 | cdev->private->flags.recog_done = 1; | |
304 | cdev->private->state = DEV_STATE_BOXED; | |
305 | wake_up(&cdev->private->wait_q); | |
306 | return; | |
307 | } | |
1da177e4 LT |
308 | break; |
309 | } | |
310 | cdev->private->state = state; | |
311 | io_subchannel_recog_done(cdev); | |
156013ff | 312 | wake_up(&cdev->private->wait_q); |
1da177e4 LT |
313 | } |
314 | ||
315 | /* | |
316 | * Function called from device_id.c after sense id has completed. | |
317 | */ | |
318 | void | |
319 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
320 | { | |
321 | switch (err) { | |
322 | case 0: | |
323 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
324 | break; | |
325 | case -ETIME: /* Sense id stopped by timeout. */ | |
326 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
327 | break; | |
328 | default: | |
329 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
c820de39 CH |
334 | int ccw_device_notify(struct ccw_device *cdev, int event) |
335 | { | |
336 | if (!cdev->drv) | |
337 | return 0; | |
338 | if (!cdev->online) | |
339 | return 0; | |
91c36919 PO |
340 | CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", |
341 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
342 | event); | |
c820de39 CH |
343 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
344 | } | |
345 | ||
91c36919 | 346 | static void cmf_reenable_delayed(struct work_struct *work) |
1da177e4 | 347 | { |
c1637532 | 348 | struct ccw_device_private *priv; |
1da177e4 | 349 | struct ccw_device *cdev; |
1da177e4 | 350 | |
c1637532 MS |
351 | priv = container_of(work, struct ccw_device_private, kick_work); |
352 | cdev = priv->cdev; | |
91c36919 PO |
353 | cmf_reenable(cdev); |
354 | } | |
355 | ||
356 | static void ccw_device_oper_notify(struct ccw_device *cdev) | |
357 | { | |
358 | if (ccw_device_notify(cdev, CIO_OPER)) { | |
94bb0633 | 359 | /* Reenable channel measurements, if needed. */ |
91c36919 PO |
360 | PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed); |
361 | queue_work(ccw_device_work, &cdev->private->kick_work); | |
362 | return; | |
363 | } | |
364 | /* Driver doesn't want device back. */ | |
365 | ccw_device_set_notoper(cdev); | |
eb32ae8d | 366 | PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unbind_bind); |
91c36919 | 367 | queue_work(ccw_device_work, &cdev->private->kick_work); |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * Finished with online/offline processing. | |
372 | */ | |
373 | static void | |
374 | ccw_device_done(struct ccw_device *cdev, int state) | |
375 | { | |
376 | struct subchannel *sch; | |
377 | ||
378 | sch = to_subchannel(cdev->dev.parent); | |
379 | ||
f1ee3281 CH |
380 | ccw_device_set_timeout(cdev, 0); |
381 | ||
1da177e4 LT |
382 | if (state != DEV_STATE_ONLINE) |
383 | cio_disable_subchannel(sch); | |
384 | ||
385 | /* Reset device status. */ | |
386 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
387 | ||
388 | cdev->private->state = state; | |
389 | ||
47593bfa | 390 | if (state == DEV_STATE_BOXED) { |
139b83dd ME |
391 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
392 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
47593bfa SO |
393 | if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED)) |
394 | ccw_device_schedule_sch_unregister(cdev); | |
395 | cdev->private->flags.donotify = 0; | |
396 | } | |
626e476a SO |
397 | if (state == DEV_STATE_NOT_OPER) { |
398 | CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", | |
399 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
400 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
401 | ccw_device_schedule_sch_unregister(cdev); | |
402 | cdev->private->flags.donotify = 0; | |
403 | } | |
1da177e4 LT |
404 | |
405 | if (cdev->private->flags.donotify) { | |
406 | cdev->private->flags.donotify = 0; | |
91c36919 | 407 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
408 | } |
409 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
410 | } |
411 | ||
4d284cac | 412 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
413 | { |
414 | char *c1; | |
415 | char *c2; | |
416 | ||
417 | c1 = (char *)p1; | |
418 | c2 = (char *)p2; | |
419 | ||
420 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
421 | } | |
422 | ||
423 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
424 | { | |
425 | int i; | |
426 | int last; | |
427 | ||
428 | last = 0; | |
429 | for (i = 0; i < 8; i++) { | |
430 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
431 | /* No PGID yet */ | |
432 | continue; | |
433 | if (cdev->private->pgid[last].inf.ps.state1 == | |
434 | SNID_STATE1_RESET) { | |
435 | /* First non-zero PGID */ | |
436 | last = i; | |
437 | continue; | |
438 | } | |
439 | if (cmp_pgid(&cdev->private->pgid[i], | |
440 | &cdev->private->pgid[last]) == 0) | |
441 | /* Non-conflicting PGIDs */ | |
442 | continue; | |
443 | ||
444 | /* PGID mismatch, can't pathgroup. */ | |
445 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
446 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
447 | cdev->private->dev_id.ssid, |
448 | cdev->private->dev_id.devno); | |
7e560814 CH |
449 | cdev->private->options.pgroup = 0; |
450 | return; | |
451 | } | |
452 | if (cdev->private->pgid[last].inf.ps.state1 == | |
453 | SNID_STATE1_RESET) | |
454 | /* No previous pgid found */ | |
7c9f4e3a CH |
455 | memcpy(&cdev->private->pgid[0], |
456 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
457 | sizeof(struct pgid)); |
458 | else | |
459 | /* Use existing pgid */ | |
460 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
461 | sizeof(struct pgid)); | |
462 | } | |
463 | ||
1da177e4 LT |
464 | /* |
465 | * Function called from device_pgid.c after sense path ground has completed. | |
466 | */ | |
467 | void | |
468 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
469 | { | |
470 | struct subchannel *sch; | |
471 | ||
472 | sch = to_subchannel(cdev->dev.parent); | |
473 | switch (err) { | |
7e560814 CH |
474 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
475 | cdev->private->options.pgroup = 0; | |
476 | break; | |
477 | case 0: /* success */ | |
478 | case -EACCES: /* partial success, some paths not operational */ | |
479 | /* Check if all pgids are equal or 0. */ | |
480 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
481 | break; |
482 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
483 | case -EUSERS: /* device is reserved for someone else. */ | |
484 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 485 | return; |
1da177e4 LT |
486 | default: |
487 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 488 | return; |
1da177e4 | 489 | } |
7e560814 | 490 | /* Start Path Group verification. */ |
7e560814 | 491 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 492 | cdev->private->flags.doverify = 0; |
7e560814 | 493 | ccw_device_verify_start(cdev); |
1da177e4 LT |
494 | } |
495 | ||
496 | /* | |
497 | * Start device recognition. | |
498 | */ | |
499 | int | |
500 | ccw_device_recognition(struct ccw_device *cdev) | |
501 | { | |
502 | struct subchannel *sch; | |
503 | int ret; | |
504 | ||
1da177e4 | 505 | sch = to_subchannel(cdev->dev.parent); |
edf22096 | 506 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
507 | if (ret != 0) |
508 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
509 | return ret; | |
510 | ||
511 | /* After 60s the device recognition is considered to have failed. */ | |
512 | ccw_device_set_timeout(cdev, 60*HZ); | |
513 | ||
514 | /* | |
515 | * We used to start here with a sense pgid to find out whether a device | |
516 | * is locked by someone else. Unfortunately, the sense pgid command | |
517 | * code has other meanings on devices predating the path grouping | |
518 | * algorithm, so we start with sense id and box the device after an | |
519 | * timeout (or if sense pgid during path verification detects the device | |
520 | * is locked, as may happen on newer devices). | |
521 | */ | |
522 | cdev->private->flags.recog_done = 0; | |
523 | cdev->private->state = DEV_STATE_SENSE_ID; | |
524 | ccw_device_sense_id_start(cdev); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Handle timeout in device recognition. | |
530 | */ | |
531 | static void | |
532 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
533 | { | |
534 | int ret; | |
535 | ||
536 | ret = ccw_device_cancel_halt_clear(cdev); | |
537 | switch (ret) { | |
538 | case 0: | |
539 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
540 | break; | |
541 | case -ENODEV: | |
542 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
543 | break; | |
544 | default: | |
545 | ccw_device_set_timeout(cdev, 3*HZ); | |
546 | } | |
547 | } | |
548 | ||
549 | ||
1da177e4 LT |
550 | void |
551 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
552 | { | |
28bdc6f6 PO |
553 | struct subchannel *sch; |
554 | ||
555 | sch = to_subchannel(cdev->dev.parent); | |
556 | /* Update schib - pom may have changed. */ | |
cdb912a4 SO |
557 | if (cio_update_schib(sch)) { |
558 | cdev->private->flags.donotify = 0; | |
559 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
560 | return; | |
561 | } | |
28bdc6f6 PO |
562 | /* Update lpm with verified path mask. */ |
563 | sch->lpm = sch->vpm; | |
564 | /* Repeat path verification? */ | |
565 | if (cdev->private->flags.doverify) { | |
566 | cdev->private->flags.doverify = 0; | |
567 | ccw_device_verify_start(cdev); | |
568 | return; | |
569 | } | |
1da177e4 LT |
570 | switch (err) { |
571 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
572 | cdev->private->options.pgroup = 0; | |
573 | case 0: | |
574 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
575 | /* Deliver fake irb to device driver, if needed. */ | |
576 | if (cdev->private->flags.fake_irb) { | |
577 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
578 | cdev->private->irb.scsw.cmd.cc = 1; |
579 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
580 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
581 | cdev->private->irb.scsw.cmd.stctl = | |
582 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
583 | cdev->private->flags.fake_irb = 0; |
584 | if (cdev->handler) | |
585 | cdev->handler(cdev, cdev->private->intparm, | |
586 | &cdev->private->irb); | |
587 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
588 | } | |
589 | break; | |
590 | case -ETIME: | |
8b42f5c2 PO |
591 | /* Reset oper notify indication after verify error. */ |
592 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
593 | ccw_device_done(cdev, DEV_STATE_BOXED); |
594 | break; | |
595 | default: | |
8b42f5c2 PO |
596 | /* Reset oper notify indication after verify error. */ |
597 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
598 | if (cdev->online) { |
599 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 600 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 601 | } else |
ee04bbcc | 602 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
603 | break; |
604 | } | |
605 | } | |
606 | ||
607 | /* | |
608 | * Get device online. | |
609 | */ | |
610 | int | |
611 | ccw_device_online(struct ccw_device *cdev) | |
612 | { | |
613 | struct subchannel *sch; | |
614 | int ret; | |
615 | ||
616 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
617 | (cdev->private->state != DEV_STATE_BOXED)) | |
618 | return -EINVAL; | |
619 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 620 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
621 | if (ret != 0) { |
622 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
623 | if (ret == -ENODEV) | |
624 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
625 | return ret; | |
626 | } | |
627 | /* Do we want to do path grouping? */ | |
628 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
629 | /* Start initial path verification. */ |
630 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 631 | cdev->private->flags.doverify = 0; |
7e560814 | 632 | ccw_device_verify_start(cdev); |
1da177e4 LT |
633 | return 0; |
634 | } | |
635 | /* Do a SensePGID first. */ | |
636 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
637 | ccw_device_sense_pgid_start(cdev); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | void | |
642 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
643 | { | |
644 | switch (err) { | |
645 | case 0: | |
646 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
647 | break; | |
648 | case -ETIME: | |
649 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
650 | break; | |
651 | default: | |
3ecb0a5a | 652 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 653 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
654 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
655 | break; | |
656 | } | |
657 | } | |
658 | ||
659 | /* | |
660 | * Shutdown device. | |
661 | */ | |
662 | int | |
663 | ccw_device_offline(struct ccw_device *cdev) | |
664 | { | |
665 | struct subchannel *sch; | |
666 | ||
b301ea8c PO |
667 | /* Allow ccw_device_offline while disconnected. */ |
668 | if (cdev->private->state == DEV_STATE_DISCONNECTED || | |
669 | cdev->private->state == DEV_STATE_NOT_OPER) { | |
670 | cdev->private->flags.donotify = 0; | |
671 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
672 | return 0; | |
673 | } | |
d7b5a4c9 CH |
674 | if (ccw_device_is_orphan(cdev)) { |
675 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
676 | return 0; | |
677 | } | |
1da177e4 | 678 | sch = to_subchannel(cdev->dev.parent); |
cdb912a4 | 679 | if (cio_update_schib(sch)) |
1da177e4 | 680 | return -ENODEV; |
23d805b6 | 681 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 682 | return -EBUSY; |
23d805b6 PO |
683 | if (cdev->private->state != DEV_STATE_ONLINE) |
684 | return -EINVAL; | |
1da177e4 LT |
685 | /* Are we doing path grouping? */ |
686 | if (!cdev->private->options.pgroup) { | |
687 | /* No, set state offline immediately. */ | |
688 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
689 | return 0; | |
690 | } | |
691 | /* Start Set Path Group commands. */ | |
692 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
693 | ccw_device_disband_start(cdev); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | /* | |
698 | * Handle timeout in device online/offline process. | |
699 | */ | |
700 | static void | |
701 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
702 | { | |
703 | int ret; | |
704 | ||
705 | ret = ccw_device_cancel_halt_clear(cdev); | |
706 | switch (ret) { | |
707 | case 0: | |
708 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
709 | break; | |
710 | case -ENODEV: | |
711 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
712 | break; | |
713 | default: | |
714 | ccw_device_set_timeout(cdev, 3*HZ); | |
715 | } | |
716 | } | |
717 | ||
718 | /* | |
719 | * Handle not oper event in device recognition. | |
720 | */ | |
721 | static void | |
722 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
723 | { | |
724 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
725 | } | |
726 | ||
727 | /* | |
3f4cf6e7 | 728 | * Handle not operational event in non-special state. |
1da177e4 | 729 | */ |
3f4cf6e7 CH |
730 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
731 | enum dev_event dev_event) | |
1da177e4 LT |
732 | { |
733 | struct subchannel *sch; | |
734 | ||
c08f294a | 735 | ccw_device_set_notoper(cdev); |
1da177e4 | 736 | sch = to_subchannel(cdev->dev.parent); |
3f4cf6e7 | 737 | css_schedule_eval(sch->schid); |
1da177e4 LT |
738 | } |
739 | ||
1f1148c8 PO |
740 | /* |
741 | * Handle path verification event in offline state. | |
742 | */ | |
743 | static void ccw_device_offline_verify(struct ccw_device *cdev, | |
744 | enum dev_event dev_event) | |
745 | { | |
746 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
747 | ||
748 | css_schedule_eval(sch->schid); | |
749 | } | |
750 | ||
1da177e4 LT |
751 | /* |
752 | * Handle path verification event. | |
753 | */ | |
754 | static void | |
755 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
756 | { | |
757 | struct subchannel *sch; | |
758 | ||
1da177e4 LT |
759 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
760 | cdev->private->flags.doverify = 1; | |
761 | return; | |
762 | } | |
763 | sch = to_subchannel(cdev->dev.parent); | |
764 | /* | |
765 | * Since we might not just be coming from an interrupt from the | |
766 | * subchannel we have to update the schib. | |
767 | */ | |
cdb912a4 SO |
768 | if (cio_update_schib(sch)) { |
769 | ccw_device_verify_done(cdev, -ENODEV); | |
770 | return; | |
771 | } | |
1da177e4 | 772 | |
23d805b6 PO |
773 | if (scsw_actl(&sch->schib.scsw) != 0 || |
774 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
775 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
776 | /* |
777 | * No final status yet or final status not yet delivered | |
778 | * to the device driver. Can't do path verfication now, | |
779 | * delay until final status was delivered. | |
780 | */ | |
781 | cdev->private->flags.doverify = 1; | |
782 | return; | |
783 | } | |
784 | /* Device is idle, we can do the path verification. */ | |
785 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 786 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
787 | ccw_device_verify_start(cdev); |
788 | } | |
789 | ||
790 | /* | |
791 | * Got an interrupt for a normal io (state online). | |
792 | */ | |
793 | static void | |
794 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
795 | { | |
796 | struct irb *irb; | |
83262d63 | 797 | int is_cmd; |
1da177e4 LT |
798 | |
799 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 800 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 801 | /* Check for unsolicited interrupt. */ |
23d805b6 | 802 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 803 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
804 | !irb->esw.esw0.erw.cons) { |
805 | /* Unit check but no sense data. Need basic sense. */ | |
806 | if (ccw_device_do_sense(cdev, irb) != 0) | |
807 | goto call_handler_unsol; | |
e0ec5749 | 808 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
809 | cdev->private->state = DEV_STATE_W4SENSE; |
810 | cdev->private->intparm = 0; | |
811 | return; | |
812 | } | |
813 | call_handler_unsol: | |
814 | if (cdev->handler) | |
815 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
816 | if (cdev->private->flags.doverify) |
817 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
818 | return; |
819 | } | |
820 | /* Accumulate status and find out if a basic sense is needed. */ | |
821 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 822 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
823 | if (ccw_device_do_sense(cdev, irb) == 0) { |
824 | cdev->private->state = DEV_STATE_W4SENSE; | |
825 | } | |
826 | return; | |
827 | } | |
828 | /* Call the handler. */ | |
829 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
830 | /* Start delayed path verification. */ | |
831 | ccw_device_online_verify(cdev, 0); | |
832 | } | |
833 | ||
834 | /* | |
835 | * Got an timeout in online state. | |
836 | */ | |
837 | static void | |
838 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
839 | { | |
840 | int ret; | |
841 | ||
842 | ccw_device_set_timeout(cdev, 0); | |
843 | ret = ccw_device_cancel_halt_clear(cdev); | |
844 | if (ret == -EBUSY) { | |
845 | ccw_device_set_timeout(cdev, 3*HZ); | |
846 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
847 | return; | |
848 | } | |
3f4cf6e7 CH |
849 | if (ret == -ENODEV) |
850 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
851 | else if (cdev->handler) | |
1da177e4 LT |
852 | cdev->handler(cdev, cdev->private->intparm, |
853 | ERR_PTR(-ETIMEDOUT)); | |
854 | } | |
855 | ||
856 | /* | |
857 | * Got an interrupt for a basic sense. | |
858 | */ | |
2b67fc46 | 859 | static void |
1da177e4 LT |
860 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
861 | { | |
862 | struct irb *irb; | |
863 | ||
864 | irb = (struct irb *) __LC_IRB; | |
865 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
866 | if (scsw_stctl(&irb->scsw) == |
867 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
868 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
869 | /* Basic sense hasn't started. Try again. */ |
870 | ccw_device_do_sense(cdev, irb); | |
871 | else { | |
139b83dd | 872 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
873 | "interrupt during w4sense...\n", |
874 | cdev->private->dev_id.ssid, | |
875 | cdev->private->dev_id.devno); | |
1da177e4 LT |
876 | if (cdev->handler) |
877 | cdev->handler (cdev, 0, irb); | |
878 | } | |
879 | return; | |
880 | } | |
3ba1998e CH |
881 | /* |
882 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
883 | * only deliver the halt/clear interrupt to the device driver as if it | |
884 | * had killed the original request. | |
885 | */ | |
23d805b6 PO |
886 | if (scsw_fctl(&irb->scsw) & |
887 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
888 | /* Retry Basic Sense if requested. */ |
889 | if (cdev->private->flags.intretry) { | |
890 | cdev->private->flags.intretry = 0; | |
891 | ccw_device_do_sense(cdev, irb); | |
892 | return; | |
893 | } | |
3ba1998e CH |
894 | cdev->private->flags.dosense = 0; |
895 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
896 | ccw_device_accumulate_irb(cdev, irb); | |
897 | goto call_handler; | |
898 | } | |
1da177e4 LT |
899 | /* Add basic sense info to irb. */ |
900 | ccw_device_accumulate_basic_sense(cdev, irb); | |
901 | if (cdev->private->flags.dosense) { | |
902 | /* Another basic sense is needed. */ | |
903 | ccw_device_do_sense(cdev, irb); | |
904 | return; | |
905 | } | |
3ba1998e | 906 | call_handler: |
1da177e4 | 907 | cdev->private->state = DEV_STATE_ONLINE; |
217ee6c6 ME |
908 | /* In case sensing interfered with setting the device online */ |
909 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
910 | /* Call the handler. */ |
911 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
912 | /* Start delayed path verification. */ | |
913 | ccw_device_online_verify(cdev, 0); | |
914 | } | |
915 | ||
916 | static void | |
917 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
918 | { | |
919 | struct irb *irb; | |
920 | ||
921 | irb = (struct irb *) __LC_IRB; | |
922 | /* Accumulate status. We don't do basic sense. */ | |
923 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
924 | /* Remember to clear irb to avoid residuals. */ |
925 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
926 | /* Try to start delayed device verification. */ |
927 | ccw_device_online_verify(cdev, 0); | |
928 | /* Note: Don't call handler for cio initiated clear! */ | |
929 | } | |
930 | ||
931 | static void | |
932 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
933 | { | |
934 | struct subchannel *sch; | |
935 | ||
936 | sch = to_subchannel(cdev->dev.parent); | |
937 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
938 | /* Start delayed path verification. */ |
939 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 940 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
941 | if (cdev->handler) |
942 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 943 | ERR_PTR(-EIO)); |
1da177e4 LT |
944 | } |
945 | ||
946 | static void | |
947 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
948 | { | |
949 | int ret; | |
950 | ||
951 | ret = ccw_device_cancel_halt_clear(cdev); | |
952 | if (ret == -EBUSY) { | |
953 | ccw_device_set_timeout(cdev, 3*HZ); | |
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 | ||
c820de39 | 963 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
964 | { |
965 | int ret; | |
1da177e4 | 966 | |
1da177e4 LT |
967 | ret = ccw_device_cancel_halt_clear(cdev); |
968 | if (ret == -EBUSY) { | |
969 | ccw_device_set_timeout(cdev, 3*HZ); | |
970 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
971 | return; | |
972 | } | |
7c8427c3 CH |
973 | /* Start delayed path verification. */ |
974 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
975 | if (cdev->handler) |
976 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 977 | ERR_PTR(-EIO)); |
1da177e4 LT |
978 | } |
979 | ||
980 | static void | |
28bdc6f6 | 981 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 982 | { |
28bdc6f6 | 983 | /* Start verification after current task finished. */ |
7e560814 | 984 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
985 | } |
986 | ||
987 | static void | |
988 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
989 | { | |
990 | struct irb *irb; | |
991 | ||
992 | switch (dev_event) { | |
993 | case DEV_EVENT_INTERRUPT: | |
994 | irb = (struct irb *) __LC_IRB; | |
995 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 996 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 997 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 998 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
999 | /* FIXME: we should restart stlck here, but this |
1000 | * is extremely unlikely ... */ | |
1001 | goto out_wakeup; | |
1002 | ||
1003 | ccw_device_accumulate_irb(cdev, irb); | |
1004 | /* We don't care about basic sense etc. */ | |
1005 | break; | |
1006 | default: /* timeout */ | |
1007 | break; | |
1008 | } | |
1009 | out_wakeup: | |
1010 | wake_up(&cdev->private->wait_q); | |
1011 | } | |
1012 | ||
1013 | static void | |
1014 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1015 | { | |
1016 | struct subchannel *sch; | |
1017 | ||
1018 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 1019 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
1020 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
1021 | return; | |
1022 | ||
1023 | /* After 60s the device recognition is considered to have failed. */ | |
1024 | ccw_device_set_timeout(cdev, 60*HZ); | |
1025 | ||
1026 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1027 | ccw_device_sense_id_start(cdev); | |
1028 | } | |
1029 | ||
c820de39 | 1030 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1031 | { |
c820de39 | 1032 | struct subchannel *sch; |
1da177e4 | 1033 | |
1da177e4 LT |
1034 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1035 | return; | |
1036 | ||
c820de39 | 1037 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1038 | /* Update some values. */ |
cdb912a4 | 1039 | if (cio_update_schib(sch)) |
7674da77 | 1040 | return; |
1da177e4 LT |
1041 | /* |
1042 | * The pim, pam, pom values may not be accurate, but they are the best | |
1043 | * we have before performing device selection :/ | |
1044 | */ | |
28bdc6f6 | 1045 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
13952ec1 SO |
1046 | /* |
1047 | * Use the initial configuration since we can't be shure that the old | |
1048 | * paths are valid. | |
1049 | */ | |
1050 | io_subchannel_init_config(sch); | |
f444cc0e SO |
1051 | if (cio_commit_config(sch)) |
1052 | return; | |
13952ec1 | 1053 | |
1da177e4 | 1054 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1055 | /* Check if this is another device which appeared on the same sch. */ |
1056 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1057 | PREPARE_WORK(&cdev->private->kick_work, | |
1058 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1059 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1060 | } else |
1061 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | static void | |
1065 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1066 | { | |
1067 | struct subchannel *sch; | |
1068 | ||
1069 | sch = to_subchannel(cdev->dev.parent); | |
1070 | /* | |
1071 | * An interrupt in state offline means a previous disable was not | |
ed04b892 | 1072 | * successful - should not happen, but we try to disable again. |
1da177e4 LT |
1073 | */ |
1074 | cio_disable_subchannel(sch); | |
1075 | } | |
1076 | ||
1077 | static void | |
1078 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1079 | { | |
1080 | retry_set_schib(cdev); | |
1081 | cdev->private->state = DEV_STATE_ONLINE; | |
1082 | dev_fsm_event(cdev, dev_event); | |
1083 | } | |
1084 | ||
94bb0633 CH |
1085 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1086 | enum dev_event dev_event) | |
1087 | { | |
1088 | cmf_retry_copy_block(cdev); | |
1089 | cdev->private->state = DEV_STATE_ONLINE; | |
1090 | dev_fsm_event(cdev, dev_event); | |
1091 | } | |
1da177e4 LT |
1092 | |
1093 | static void | |
1094 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1095 | { | |
1096 | ccw_device_set_timeout(cdev, 0); | |
1097 | if (dev_event == DEV_EVENT_NOTOPER) | |
1098 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1099 | else | |
1100 | cdev->private->state = DEV_STATE_OFFLINE; | |
1101 | wake_up(&cdev->private->wait_q); | |
1102 | } | |
1103 | ||
1104 | static void | |
1105 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1106 | { | |
1107 | int ret; | |
1108 | ||
1109 | ret = ccw_device_cancel_halt_clear(cdev); | |
1110 | switch (ret) { | |
1111 | case 0: | |
1112 | cdev->private->state = DEV_STATE_OFFLINE; | |
1113 | wake_up(&cdev->private->wait_q); | |
1114 | break; | |
1115 | case -ENODEV: | |
1116 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1117 | wake_up(&cdev->private->wait_q); | |
1118 | break; | |
1119 | default: | |
1120 | ccw_device_set_timeout(cdev, HZ/10); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * No operation action. This is used e.g. to ignore a timeout event in | |
1126 | * state offline. | |
1127 | */ | |
1128 | static void | |
1129 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1130 | { | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Bug operation action. | |
1135 | */ | |
1136 | static void | |
1137 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1138 | { | |
139b83dd ME |
1139 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1140 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1141 | cdev->private->dev_id.ssid, | |
1142 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1143 | BUG(); |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * device statemachine | |
1148 | */ | |
1149 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1150 | [DEV_STATE_NOT_OPER] = { | |
1151 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1152 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1153 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1154 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1155 | }, | |
1156 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1157 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1158 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1159 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1160 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1161 | }, | |
1162 | [DEV_STATE_SENSE_ID] = { | |
1163 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1164 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1165 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1166 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1167 | }, | |
1168 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1169 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1170 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1171 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1f1148c8 | 1172 | [DEV_EVENT_VERIFY] = ccw_device_offline_verify, |
1da177e4 LT |
1173 | }, |
1174 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1175 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1176 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1177 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1178 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1179 | }, |
1180 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1181 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1182 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1183 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1184 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1185 | }, | |
1186 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1187 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1188 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1189 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1190 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1191 | }, | |
1192 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1193 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1194 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1195 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1196 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1197 | }, | |
1198 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1199 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1200 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1201 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1202 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1203 | }, | |
1204 | /* states to wait for i/o completion before doing something */ | |
1205 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1206 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1207 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1208 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1209 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1210 | }, | |
1211 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1212 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1213 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1214 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1215 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1216 | }, | |
1da177e4 LT |
1217 | [DEV_STATE_QUIESCE] = { |
1218 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1219 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1220 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1221 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1222 | }, | |
1223 | /* special states for devices gone not operational */ | |
1224 | [DEV_STATE_DISCONNECTED] = { | |
1225 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1226 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1227 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1228 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1229 | }, |
1230 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1231 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1232 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1233 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1234 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1235 | }, | |
1236 | [DEV_STATE_CMFCHANGE] = { | |
1237 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1238 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1239 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1240 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1241 | }, | |
94bb0633 CH |
1242 | [DEV_STATE_CMFUPDATE] = { |
1243 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1244 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1245 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1246 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1247 | }, | |
1da177e4 LT |
1248 | }; |
1249 | ||
1da177e4 | 1250 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |