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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); | |
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); | |
37de53bb | 292 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
1da177e4 | 293 | } |
823d494a | 294 | return; |
1da177e4 | 295 | case DEV_STATE_BOXED: |
139b83dd ME |
296 | CIO_MSG_EVENT(0, "SenseID : boxed device %04x on " |
297 | " subchannel 0.%x.%04x\n", | |
298 | cdev->private->dev_id.devno, | |
299 | sch->schid.ssid, sch->schid.sch_no); | |
47593bfa SO |
300 | if (cdev->id.cu_type != 0) { /* device was recognized before */ |
301 | cdev->private->flags.recog_done = 1; | |
302 | cdev->private->state = DEV_STATE_BOXED; | |
303 | wake_up(&cdev->private->wait_q); | |
304 | return; | |
305 | } | |
1da177e4 LT |
306 | break; |
307 | } | |
308 | cdev->private->state = state; | |
309 | io_subchannel_recog_done(cdev); | |
156013ff | 310 | wake_up(&cdev->private->wait_q); |
1da177e4 LT |
311 | } |
312 | ||
313 | /* | |
314 | * Function called from device_id.c after sense id has completed. | |
315 | */ | |
316 | void | |
317 | ccw_device_sense_id_done(struct ccw_device *cdev, int err) | |
318 | { | |
319 | switch (err) { | |
320 | case 0: | |
321 | ccw_device_recog_done(cdev, DEV_STATE_OFFLINE); | |
322 | break; | |
323 | case -ETIME: /* Sense id stopped by timeout. */ | |
324 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
325 | break; | |
326 | default: | |
327 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
328 | break; | |
329 | } | |
330 | } | |
331 | ||
c820de39 CH |
332 | int ccw_device_notify(struct ccw_device *cdev, int event) |
333 | { | |
334 | if (!cdev->drv) | |
335 | return 0; | |
336 | if (!cdev->online) | |
337 | return 0; | |
91c36919 PO |
338 | CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", |
339 | cdev->private->dev_id.ssid, cdev->private->dev_id.devno, | |
340 | event); | |
c820de39 CH |
341 | return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; |
342 | } | |
343 | ||
91c36919 PO |
344 | static void ccw_device_oper_notify(struct ccw_device *cdev) |
345 | { | |
346 | if (ccw_device_notify(cdev, CIO_OPER)) { | |
94bb0633 | 347 | /* Reenable channel measurements, if needed. */ |
37de53bb | 348 | ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); |
91c36919 PO |
349 | return; |
350 | } | |
351 | /* Driver doesn't want device back. */ | |
352 | ccw_device_set_notoper(cdev); | |
37de53bb | 353 | ccw_device_sched_todo(cdev, CDEV_TODO_REBIND); |
1da177e4 LT |
354 | } |
355 | ||
356 | /* | |
357 | * Finished with online/offline processing. | |
358 | */ | |
359 | static void | |
360 | ccw_device_done(struct ccw_device *cdev, int state) | |
361 | { | |
362 | struct subchannel *sch; | |
363 | ||
364 | sch = to_subchannel(cdev->dev.parent); | |
365 | ||
f1ee3281 CH |
366 | ccw_device_set_timeout(cdev, 0); |
367 | ||
1da177e4 LT |
368 | if (state != DEV_STATE_ONLINE) |
369 | cio_disable_subchannel(sch); | |
370 | ||
371 | /* Reset device status. */ | |
372 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
373 | ||
374 | cdev->private->state = state; | |
375 | ||
9a332116 PO |
376 | switch (state) { |
377 | case DEV_STATE_BOXED: | |
139b83dd ME |
378 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
379 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
47593bfa | 380 | if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED)) |
37de53bb | 381 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
47593bfa | 382 | cdev->private->flags.donotify = 0; |
9a332116 PO |
383 | break; |
384 | case DEV_STATE_NOT_OPER: | |
626e476a SO |
385 | CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", |
386 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
387 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
37de53bb | 388 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
6afcc775 PO |
389 | else |
390 | ccw_device_set_disconnected(cdev); | |
626e476a | 391 | cdev->private->flags.donotify = 0; |
9a332116 PO |
392 | break; |
393 | case DEV_STATE_DISCONNECTED: | |
394 | CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " | |
395 | "%04x\n", cdev->private->dev_id.devno, | |
396 | sch->schid.sch_no); | |
397 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
37de53bb | 398 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
9a332116 PO |
399 | else |
400 | ccw_device_set_disconnected(cdev); | |
401 | cdev->private->flags.donotify = 0; | |
402 | break; | |
403 | default: | |
404 | break; | |
626e476a | 405 | } |
1da177e4 LT |
406 | |
407 | if (cdev->private->flags.donotify) { | |
408 | cdev->private->flags.donotify = 0; | |
91c36919 | 409 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
410 | } |
411 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
412 | } |
413 | ||
4d284cac | 414 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
415 | { |
416 | char *c1; | |
417 | char *c2; | |
418 | ||
419 | c1 = (char *)p1; | |
420 | c2 = (char *)p2; | |
421 | ||
422 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
423 | } | |
424 | ||
425 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
426 | { | |
427 | int i; | |
428 | int last; | |
429 | ||
430 | last = 0; | |
431 | for (i = 0; i < 8; i++) { | |
432 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
433 | /* No PGID yet */ | |
434 | continue; | |
435 | if (cdev->private->pgid[last].inf.ps.state1 == | |
436 | SNID_STATE1_RESET) { | |
437 | /* First non-zero PGID */ | |
438 | last = i; | |
439 | continue; | |
440 | } | |
441 | if (cmp_pgid(&cdev->private->pgid[i], | |
442 | &cdev->private->pgid[last]) == 0) | |
443 | /* Non-conflicting PGIDs */ | |
444 | continue; | |
445 | ||
446 | /* PGID mismatch, can't pathgroup. */ | |
447 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
448 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
449 | cdev->private->dev_id.ssid, |
450 | cdev->private->dev_id.devno); | |
7e560814 CH |
451 | cdev->private->options.pgroup = 0; |
452 | return; | |
453 | } | |
454 | if (cdev->private->pgid[last].inf.ps.state1 == | |
455 | SNID_STATE1_RESET) | |
456 | /* No previous pgid found */ | |
7c9f4e3a CH |
457 | memcpy(&cdev->private->pgid[0], |
458 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
459 | sizeof(struct pgid)); |
460 | else | |
461 | /* Use existing pgid */ | |
462 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
463 | sizeof(struct pgid)); | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /* |
467 | * Function called from device_pgid.c after sense path ground has completed. | |
468 | */ | |
469 | void | |
470 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
471 | { | |
472 | struct subchannel *sch; | |
473 | ||
474 | sch = to_subchannel(cdev->dev.parent); | |
475 | switch (err) { | |
7e560814 CH |
476 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
477 | cdev->private->options.pgroup = 0; | |
478 | break; | |
479 | case 0: /* success */ | |
480 | case -EACCES: /* partial success, some paths not operational */ | |
481 | /* Check if all pgids are equal or 0. */ | |
482 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
483 | break; |
484 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
485 | case -EUSERS: /* device is reserved for someone else. */ | |
486 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 487 | return; |
1da177e4 LT |
488 | default: |
489 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 490 | return; |
1da177e4 | 491 | } |
7e560814 | 492 | /* Start Path Group verification. */ |
7e560814 | 493 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 494 | cdev->private->flags.doverify = 0; |
7e560814 | 495 | ccw_device_verify_start(cdev); |
1da177e4 LT |
496 | } |
497 | ||
498 | /* | |
499 | * Start device recognition. | |
500 | */ | |
736b5db8 | 501 | void ccw_device_recognition(struct ccw_device *cdev) |
1da177e4 | 502 | { |
736b5db8 | 503 | struct subchannel *sch = to_subchannel(cdev->dev.parent); |
1da177e4 LT |
504 | |
505 | /* | |
506 | * We used to start here with a sense pgid to find out whether a device | |
507 | * is locked by someone else. Unfortunately, the sense pgid command | |
508 | * code has other meanings on devices predating the path grouping | |
509 | * algorithm, so we start with sense id and box the device after an | |
510 | * timeout (or if sense pgid during path verification detects the device | |
511 | * is locked, as may happen on newer devices). | |
512 | */ | |
513 | cdev->private->flags.recog_done = 0; | |
514 | cdev->private->state = DEV_STATE_SENSE_ID; | |
736b5db8 PO |
515 | if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) { |
516 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
517 | return; | |
518 | } | |
1da177e4 | 519 | ccw_device_sense_id_start(cdev); |
1da177e4 LT |
520 | } |
521 | ||
522 | /* | |
523 | * Handle timeout in device recognition. | |
524 | */ | |
525 | static void | |
526 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
527 | { | |
528 | int ret; | |
529 | ||
530 | ret = ccw_device_cancel_halt_clear(cdev); | |
531 | switch (ret) { | |
532 | case 0: | |
533 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
534 | break; | |
535 | case -ENODEV: | |
536 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
537 | break; | |
538 | default: | |
539 | ccw_device_set_timeout(cdev, 3*HZ); | |
540 | } | |
541 | } | |
542 | ||
543 | ||
1da177e4 LT |
544 | void |
545 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
546 | { | |
28bdc6f6 PO |
547 | struct subchannel *sch; |
548 | ||
549 | sch = to_subchannel(cdev->dev.parent); | |
550 | /* Update schib - pom may have changed. */ | |
cdb912a4 | 551 | if (cio_update_schib(sch)) { |
7c4d964f PO |
552 | err = -ENODEV; |
553 | goto callback; | |
cdb912a4 | 554 | } |
28bdc6f6 PO |
555 | /* Update lpm with verified path mask. */ |
556 | sch->lpm = sch->vpm; | |
557 | /* Repeat path verification? */ | |
558 | if (cdev->private->flags.doverify) { | |
559 | cdev->private->flags.doverify = 0; | |
560 | ccw_device_verify_start(cdev); | |
561 | return; | |
562 | } | |
7c4d964f | 563 | callback: |
1da177e4 | 564 | switch (err) { |
1da177e4 LT |
565 | case 0: |
566 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
567 | /* Deliver fake irb to device driver, if needed. */ | |
568 | if (cdev->private->flags.fake_irb) { | |
569 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
570 | cdev->private->irb.scsw.cmd.cc = 1; |
571 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
572 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
573 | cdev->private->irb.scsw.cmd.stctl = | |
574 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
575 | cdev->private->flags.fake_irb = 0; |
576 | if (cdev->handler) | |
577 | cdev->handler(cdev, cdev->private->intparm, | |
578 | &cdev->private->irb); | |
579 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
580 | } | |
581 | break; | |
582 | case -ETIME: | |
8b42f5c2 PO |
583 | /* Reset oper notify indication after verify error. */ |
584 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
585 | ccw_device_done(cdev, DEV_STATE_BOXED); |
586 | break; | |
7c4d964f PO |
587 | case -EACCES: |
588 | /* Reset oper notify indication after verify error. */ | |
589 | cdev->private->flags.donotify = 0; | |
590 | ccw_device_done(cdev, DEV_STATE_DISCONNECTED); | |
591 | break; | |
1da177e4 | 592 | default: |
8b42f5c2 PO |
593 | /* Reset oper notify indication after verify error. */ |
594 | cdev->private->flags.donotify = 0; | |
7c4d964f | 595 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
596 | break; |
597 | } | |
598 | } | |
599 | ||
600 | /* | |
601 | * Get device online. | |
602 | */ | |
603 | int | |
604 | ccw_device_online(struct ccw_device *cdev) | |
605 | { | |
606 | struct subchannel *sch; | |
607 | int ret; | |
608 | ||
609 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
610 | (cdev->private->state != DEV_STATE_BOXED)) | |
611 | return -EINVAL; | |
612 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 613 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
614 | if (ret != 0) { |
615 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
616 | if (ret == -ENODEV) | |
617 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
618 | return ret; | |
619 | } | |
620 | /* Do we want to do path grouping? */ | |
621 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
622 | /* Start initial path verification. */ |
623 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 624 | cdev->private->flags.doverify = 0; |
7e560814 | 625 | ccw_device_verify_start(cdev); |
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | /* Do a SensePGID first. */ | |
629 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
630 | ccw_device_sense_pgid_start(cdev); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | void | |
635 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
636 | { | |
637 | switch (err) { | |
638 | case 0: | |
639 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
640 | break; | |
641 | case -ETIME: | |
642 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
643 | break; | |
644 | default: | |
3ecb0a5a | 645 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 646 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
647 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
652 | /* | |
653 | * Shutdown device. | |
654 | */ | |
655 | int | |
656 | ccw_device_offline(struct ccw_device *cdev) | |
657 | { | |
658 | struct subchannel *sch; | |
659 | ||
b301ea8c PO |
660 | /* Allow ccw_device_offline while disconnected. */ |
661 | if (cdev->private->state == DEV_STATE_DISCONNECTED || | |
662 | cdev->private->state == DEV_STATE_NOT_OPER) { | |
663 | cdev->private->flags.donotify = 0; | |
664 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
665 | return 0; | |
666 | } | |
102e835d PO |
667 | if (cdev->private->state == DEV_STATE_BOXED) { |
668 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
669 | return 0; | |
670 | } | |
d7b5a4c9 CH |
671 | if (ccw_device_is_orphan(cdev)) { |
672 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
673 | return 0; | |
674 | } | |
1da177e4 | 675 | sch = to_subchannel(cdev->dev.parent); |
cdb912a4 | 676 | if (cio_update_schib(sch)) |
1da177e4 | 677 | return -ENODEV; |
23d805b6 | 678 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 679 | return -EBUSY; |
23d805b6 PO |
680 | if (cdev->private->state != DEV_STATE_ONLINE) |
681 | return -EINVAL; | |
1da177e4 LT |
682 | /* Are we doing path grouping? */ |
683 | if (!cdev->private->options.pgroup) { | |
684 | /* No, set state offline immediately. */ | |
685 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
686 | return 0; | |
687 | } | |
688 | /* Start Set Path Group commands. */ | |
689 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
690 | ccw_device_disband_start(cdev); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /* | |
695 | * Handle timeout in device online/offline process. | |
696 | */ | |
697 | static void | |
698 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
699 | { | |
700 | int ret; | |
701 | ||
702 | ret = ccw_device_cancel_halt_clear(cdev); | |
703 | switch (ret) { | |
704 | case 0: | |
705 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
706 | break; | |
707 | case -ENODEV: | |
708 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
709 | break; | |
710 | default: | |
711 | ccw_device_set_timeout(cdev, 3*HZ); | |
712 | } | |
713 | } | |
714 | ||
715 | /* | |
716 | * Handle not oper event in device recognition. | |
717 | */ | |
718 | static void | |
719 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
720 | { | |
721 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
722 | } | |
723 | ||
724 | /* | |
3f4cf6e7 | 725 | * Handle not operational event in non-special state. |
1da177e4 | 726 | */ |
3f4cf6e7 CH |
727 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
728 | enum dev_event dev_event) | |
1da177e4 | 729 | { |
6afcc775 | 730 | if (!ccw_device_notify(cdev, CIO_GONE)) |
37de53bb | 731 | ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); |
6afcc775 PO |
732 | else |
733 | ccw_device_set_disconnected(cdev); | |
1da177e4 LT |
734 | } |
735 | ||
1f1148c8 PO |
736 | /* |
737 | * Handle path verification event in offline state. | |
738 | */ | |
739 | static void ccw_device_offline_verify(struct ccw_device *cdev, | |
740 | enum dev_event dev_event) | |
741 | { | |
742 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
743 | ||
744 | css_schedule_eval(sch->schid); | |
745 | } | |
746 | ||
1da177e4 LT |
747 | /* |
748 | * Handle path verification event. | |
749 | */ | |
750 | static void | |
751 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
752 | { | |
753 | struct subchannel *sch; | |
754 | ||
1da177e4 LT |
755 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
756 | cdev->private->flags.doverify = 1; | |
757 | return; | |
758 | } | |
759 | sch = to_subchannel(cdev->dev.parent); | |
760 | /* | |
761 | * Since we might not just be coming from an interrupt from the | |
762 | * subchannel we have to update the schib. | |
763 | */ | |
cdb912a4 SO |
764 | if (cio_update_schib(sch)) { |
765 | ccw_device_verify_done(cdev, -ENODEV); | |
766 | return; | |
767 | } | |
1da177e4 | 768 | |
23d805b6 PO |
769 | if (scsw_actl(&sch->schib.scsw) != 0 || |
770 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
771 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
772 | /* |
773 | * No final status yet or final status not yet delivered | |
774 | * to the device driver. Can't do path verfication now, | |
775 | * delay until final status was delivered. | |
776 | */ | |
777 | cdev->private->flags.doverify = 1; | |
778 | return; | |
779 | } | |
780 | /* Device is idle, we can do the path verification. */ | |
781 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 782 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
783 | ccw_device_verify_start(cdev); |
784 | } | |
785 | ||
786 | /* | |
787 | * Got an interrupt for a normal io (state online). | |
788 | */ | |
789 | static void | |
790 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
791 | { | |
792 | struct irb *irb; | |
83262d63 | 793 | int is_cmd; |
1da177e4 LT |
794 | |
795 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 796 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 797 | /* Check for unsolicited interrupt. */ |
23d805b6 | 798 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 799 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
800 | !irb->esw.esw0.erw.cons) { |
801 | /* Unit check but no sense data. Need basic sense. */ | |
802 | if (ccw_device_do_sense(cdev, irb) != 0) | |
803 | goto call_handler_unsol; | |
e0ec5749 | 804 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
805 | cdev->private->state = DEV_STATE_W4SENSE; |
806 | cdev->private->intparm = 0; | |
807 | return; | |
808 | } | |
809 | call_handler_unsol: | |
810 | if (cdev->handler) | |
811 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
812 | if (cdev->private->flags.doverify) |
813 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
814 | return; |
815 | } | |
816 | /* Accumulate status and find out if a basic sense is needed. */ | |
817 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 818 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
819 | if (ccw_device_do_sense(cdev, irb) == 0) { |
820 | cdev->private->state = DEV_STATE_W4SENSE; | |
821 | } | |
822 | return; | |
823 | } | |
824 | /* Call the handler. */ | |
825 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
826 | /* Start delayed path verification. */ | |
827 | ccw_device_online_verify(cdev, 0); | |
828 | } | |
829 | ||
830 | /* | |
831 | * Got an timeout in online state. | |
832 | */ | |
833 | static void | |
834 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
835 | { | |
836 | int ret; | |
837 | ||
838 | ccw_device_set_timeout(cdev, 0); | |
839 | ret = ccw_device_cancel_halt_clear(cdev); | |
840 | if (ret == -EBUSY) { | |
841 | ccw_device_set_timeout(cdev, 3*HZ); | |
842 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
843 | return; | |
844 | } | |
3f4cf6e7 CH |
845 | if (ret == -ENODEV) |
846 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
847 | else if (cdev->handler) | |
1da177e4 LT |
848 | cdev->handler(cdev, cdev->private->intparm, |
849 | ERR_PTR(-ETIMEDOUT)); | |
850 | } | |
851 | ||
852 | /* | |
853 | * Got an interrupt for a basic sense. | |
854 | */ | |
2b67fc46 | 855 | static void |
1da177e4 LT |
856 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
857 | { | |
858 | struct irb *irb; | |
859 | ||
860 | irb = (struct irb *) __LC_IRB; | |
861 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
862 | if (scsw_stctl(&irb->scsw) == |
863 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
864 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
865 | /* Basic sense hasn't started. Try again. */ |
866 | ccw_device_do_sense(cdev, irb); | |
867 | else { | |
139b83dd | 868 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
869 | "interrupt during w4sense...\n", |
870 | cdev->private->dev_id.ssid, | |
871 | cdev->private->dev_id.devno); | |
1da177e4 LT |
872 | if (cdev->handler) |
873 | cdev->handler (cdev, 0, irb); | |
874 | } | |
875 | return; | |
876 | } | |
3ba1998e CH |
877 | /* |
878 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
879 | * only deliver the halt/clear interrupt to the device driver as if it | |
880 | * had killed the original request. | |
881 | */ | |
23d805b6 PO |
882 | if (scsw_fctl(&irb->scsw) & |
883 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
884 | /* Retry Basic Sense if requested. */ |
885 | if (cdev->private->flags.intretry) { | |
886 | cdev->private->flags.intretry = 0; | |
887 | ccw_device_do_sense(cdev, irb); | |
888 | return; | |
889 | } | |
3ba1998e CH |
890 | cdev->private->flags.dosense = 0; |
891 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
892 | ccw_device_accumulate_irb(cdev, irb); | |
893 | goto call_handler; | |
894 | } | |
1da177e4 LT |
895 | /* Add basic sense info to irb. */ |
896 | ccw_device_accumulate_basic_sense(cdev, irb); | |
897 | if (cdev->private->flags.dosense) { | |
898 | /* Another basic sense is needed. */ | |
899 | ccw_device_do_sense(cdev, irb); | |
900 | return; | |
901 | } | |
3ba1998e | 902 | call_handler: |
1da177e4 | 903 | cdev->private->state = DEV_STATE_ONLINE; |
217ee6c6 ME |
904 | /* In case sensing interfered with setting the device online */ |
905 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
906 | /* Call the handler. */ |
907 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
908 | /* Start delayed path verification. */ | |
909 | ccw_device_online_verify(cdev, 0); | |
910 | } | |
911 | ||
912 | static void | |
913 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
914 | { | |
915 | struct irb *irb; | |
916 | ||
917 | irb = (struct irb *) __LC_IRB; | |
918 | /* Accumulate status. We don't do basic sense. */ | |
919 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
920 | /* Remember to clear irb to avoid residuals. */ |
921 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
922 | /* Try to start delayed device verification. */ |
923 | ccw_device_online_verify(cdev, 0); | |
924 | /* Note: Don't call handler for cio initiated clear! */ | |
925 | } | |
926 | ||
927 | static void | |
928 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
929 | { | |
930 | struct subchannel *sch; | |
931 | ||
932 | sch = to_subchannel(cdev->dev.parent); | |
933 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
934 | /* Start delayed path verification. */ |
935 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 936 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
937 | if (cdev->handler) |
938 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 939 | ERR_PTR(-EIO)); |
1da177e4 LT |
940 | } |
941 | ||
942 | static void | |
943 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
944 | { | |
945 | int ret; | |
946 | ||
947 | ret = ccw_device_cancel_halt_clear(cdev); | |
948 | if (ret == -EBUSY) { | |
949 | ccw_device_set_timeout(cdev, 3*HZ); | |
950 | return; | |
951 | } | |
7c8427c3 CH |
952 | /* Start delayed path verification. */ |
953 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
954 | if (cdev->handler) |
955 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 956 | ERR_PTR(-EIO)); |
1da177e4 LT |
957 | } |
958 | ||
c820de39 | 959 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
960 | { |
961 | int ret; | |
1da177e4 | 962 | |
1da177e4 LT |
963 | ret = ccw_device_cancel_halt_clear(cdev); |
964 | if (ret == -EBUSY) { | |
965 | ccw_device_set_timeout(cdev, 3*HZ); | |
966 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
967 | return; | |
968 | } | |
7c8427c3 CH |
969 | /* Start delayed path verification. */ |
970 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
971 | if (cdev->handler) |
972 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 973 | ERR_PTR(-EIO)); |
1da177e4 LT |
974 | } |
975 | ||
976 | static void | |
28bdc6f6 | 977 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 978 | { |
28bdc6f6 | 979 | /* Start verification after current task finished. */ |
7e560814 | 980 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
981 | } |
982 | ||
983 | static void | |
984 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
985 | { | |
986 | struct irb *irb; | |
987 | ||
988 | switch (dev_event) { | |
989 | case DEV_EVENT_INTERRUPT: | |
990 | irb = (struct irb *) __LC_IRB; | |
991 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 992 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 993 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 994 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
995 | /* FIXME: we should restart stlck here, but this |
996 | * is extremely unlikely ... */ | |
997 | goto out_wakeup; | |
998 | ||
999 | ccw_device_accumulate_irb(cdev, irb); | |
1000 | /* We don't care about basic sense etc. */ | |
1001 | break; | |
1002 | default: /* timeout */ | |
1003 | break; | |
1004 | } | |
1005 | out_wakeup: | |
1006 | wake_up(&cdev->private->wait_q); | |
1007 | } | |
1008 | ||
1009 | static void | |
1010 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1011 | { | |
1012 | struct subchannel *sch; | |
1013 | ||
1014 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 1015 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
1016 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
1017 | return; | |
1018 | ||
1019 | /* After 60s the device recognition is considered to have failed. */ | |
1020 | ccw_device_set_timeout(cdev, 60*HZ); | |
1021 | ||
1022 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1023 | ccw_device_sense_id_start(cdev); | |
1024 | } | |
1025 | ||
c820de39 | 1026 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1027 | { |
c820de39 | 1028 | struct subchannel *sch; |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1031 | return; | |
1032 | ||
c820de39 | 1033 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1034 | /* Update some values. */ |
cdb912a4 | 1035 | if (cio_update_schib(sch)) |
7674da77 | 1036 | return; |
1da177e4 LT |
1037 | /* |
1038 | * The pim, pam, pom values may not be accurate, but they are the best | |
1039 | * we have before performing device selection :/ | |
1040 | */ | |
28bdc6f6 | 1041 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
13952ec1 SO |
1042 | /* |
1043 | * Use the initial configuration since we can't be shure that the old | |
1044 | * paths are valid. | |
1045 | */ | |
1046 | io_subchannel_init_config(sch); | |
f444cc0e SO |
1047 | if (cio_commit_config(sch)) |
1048 | return; | |
13952ec1 | 1049 | |
1da177e4 | 1050 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 | 1051 | /* Check if this is another device which appeared on the same sch. */ |
5d6e6b6f PO |
1052 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) |
1053 | css_schedule_eval(sch->schid); | |
1054 | else | |
d7b5a4c9 | 1055 | ccw_device_start_id(cdev, 0); |
1da177e4 LT |
1056 | } |
1057 | ||
16b9a057 PO |
1058 | static void ccw_device_disabled_irq(struct ccw_device *cdev, |
1059 | enum dev_event dev_event) | |
1da177e4 LT |
1060 | { |
1061 | struct subchannel *sch; | |
1062 | ||
1063 | sch = to_subchannel(cdev->dev.parent); | |
1064 | /* | |
16b9a057 | 1065 | * An interrupt in a disabled state means a previous disable was not |
ed04b892 | 1066 | * successful - should not happen, but we try to disable again. |
1da177e4 LT |
1067 | */ |
1068 | cio_disable_subchannel(sch); | |
1069 | } | |
1070 | ||
1071 | static void | |
1072 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1073 | { | |
1074 | retry_set_schib(cdev); | |
1075 | cdev->private->state = DEV_STATE_ONLINE; | |
1076 | dev_fsm_event(cdev, dev_event); | |
1077 | } | |
1078 | ||
94bb0633 CH |
1079 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1080 | enum dev_event dev_event) | |
1081 | { | |
1082 | cmf_retry_copy_block(cdev); | |
1083 | cdev->private->state = DEV_STATE_ONLINE; | |
1084 | dev_fsm_event(cdev, dev_event); | |
1085 | } | |
1da177e4 LT |
1086 | |
1087 | static void | |
1088 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1089 | { | |
1090 | ccw_device_set_timeout(cdev, 0); | |
1091 | if (dev_event == DEV_EVENT_NOTOPER) | |
1092 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1093 | else | |
1094 | cdev->private->state = DEV_STATE_OFFLINE; | |
1095 | wake_up(&cdev->private->wait_q); | |
1096 | } | |
1097 | ||
1098 | static void | |
1099 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1100 | { | |
1101 | int ret; | |
1102 | ||
1103 | ret = ccw_device_cancel_halt_clear(cdev); | |
1104 | switch (ret) { | |
1105 | case 0: | |
1106 | cdev->private->state = DEV_STATE_OFFLINE; | |
1107 | wake_up(&cdev->private->wait_q); | |
1108 | break; | |
1109 | case -ENODEV: | |
1110 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1111 | wake_up(&cdev->private->wait_q); | |
1112 | break; | |
1113 | default: | |
1114 | ccw_device_set_timeout(cdev, HZ/10); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * No operation action. This is used e.g. to ignore a timeout event in | |
1120 | * state offline. | |
1121 | */ | |
1122 | static void | |
1123 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1124 | { | |
1125 | } | |
1126 | ||
1da177e4 LT |
1127 | /* |
1128 | * device statemachine | |
1129 | */ | |
1130 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1131 | [DEV_STATE_NOT_OPER] = { | |
1132 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
16b9a057 | 1133 | [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, |
1da177e4 LT |
1134 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
1135 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1136 | }, | |
1137 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1138 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1139 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1140 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1141 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1142 | }, | |
1143 | [DEV_STATE_SENSE_ID] = { | |
1144 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1145 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1146 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1147 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1148 | }, | |
1149 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1150 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
16b9a057 | 1151 | [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq, |
1da177e4 | 1152 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
1f1148c8 | 1153 | [DEV_EVENT_VERIFY] = ccw_device_offline_verify, |
1da177e4 LT |
1154 | }, |
1155 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1156 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1157 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1158 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1159 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1160 | }, |
1161 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1162 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1163 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1164 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1165 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1166 | }, | |
1167 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1168 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1169 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1170 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1171 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1172 | }, | |
1173 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1174 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1175 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1176 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1177 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1178 | }, | |
1179 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1180 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1181 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1182 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1183 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1184 | }, | |
1185 | /* states to wait for i/o completion before doing something */ | |
1186 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1187 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1188 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1189 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1190 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1191 | }, | |
1192 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1193 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1194 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1195 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1196 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1197 | }, | |
1da177e4 LT |
1198 | [DEV_STATE_QUIESCE] = { |
1199 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1200 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1201 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1202 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1203 | }, | |
1204 | /* special states for devices gone not operational */ | |
1205 | [DEV_STATE_DISCONNECTED] = { | |
1206 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1207 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
16b9a057 | 1208 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, |
28bdc6f6 | 1209 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1210 | }, |
1211 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1212 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1213 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1214 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1215 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1216 | }, | |
1217 | [DEV_STATE_CMFCHANGE] = { | |
1218 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1219 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1220 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1221 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1222 | }, | |
94bb0633 CH |
1223 | [DEV_STATE_CMFUPDATE] = { |
1224 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1225 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1226 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1227 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1228 | }, | |
1da177e4 LT |
1229 | }; |
1230 | ||
1da177e4 | 1231 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |