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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); | |
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 | ||
9a332116 PO |
390 | switch (state) { |
391 | case DEV_STATE_BOXED: | |
139b83dd ME |
392 | CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", |
393 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
47593bfa SO |
394 | if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED)) |
395 | ccw_device_schedule_sch_unregister(cdev); | |
396 | cdev->private->flags.donotify = 0; | |
9a332116 PO |
397 | break; |
398 | case DEV_STATE_NOT_OPER: | |
626e476a SO |
399 | CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", |
400 | cdev->private->dev_id.devno, sch->schid.sch_no); | |
401 | if (!ccw_device_notify(cdev, CIO_GONE)) | |
402 | ccw_device_schedule_sch_unregister(cdev); | |
6afcc775 PO |
403 | else |
404 | ccw_device_set_disconnected(cdev); | |
626e476a | 405 | cdev->private->flags.donotify = 0; |
9a332116 PO |
406 | break; |
407 | case DEV_STATE_DISCONNECTED: | |
408 | CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " | |
409 | "%04x\n", cdev->private->dev_id.devno, | |
410 | sch->schid.sch_no); | |
411 | if (!ccw_device_notify(cdev, CIO_NO_PATH)) | |
412 | ccw_device_schedule_sch_unregister(cdev); | |
413 | else | |
414 | ccw_device_set_disconnected(cdev); | |
415 | cdev->private->flags.donotify = 0; | |
416 | break; | |
417 | default: | |
418 | break; | |
626e476a | 419 | } |
1da177e4 LT |
420 | |
421 | if (cdev->private->flags.donotify) { | |
422 | cdev->private->flags.donotify = 0; | |
91c36919 | 423 | ccw_device_oper_notify(cdev); |
1da177e4 LT |
424 | } |
425 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
426 | } |
427 | ||
4d284cac | 428 | static int cmp_pgid(struct pgid *p1, struct pgid *p2) |
7e560814 CH |
429 | { |
430 | char *c1; | |
431 | char *c2; | |
432 | ||
433 | c1 = (char *)p1; | |
434 | c2 = (char *)p2; | |
435 | ||
436 | return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1); | |
437 | } | |
438 | ||
439 | static void __ccw_device_get_common_pgid(struct ccw_device *cdev) | |
440 | { | |
441 | int i; | |
442 | int last; | |
443 | ||
444 | last = 0; | |
445 | for (i = 0; i < 8; i++) { | |
446 | if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET) | |
447 | /* No PGID yet */ | |
448 | continue; | |
449 | if (cdev->private->pgid[last].inf.ps.state1 == | |
450 | SNID_STATE1_RESET) { | |
451 | /* First non-zero PGID */ | |
452 | last = i; | |
453 | continue; | |
454 | } | |
455 | if (cmp_pgid(&cdev->private->pgid[i], | |
456 | &cdev->private->pgid[last]) == 0) | |
457 | /* Non-conflicting PGIDs */ | |
458 | continue; | |
459 | ||
460 | /* PGID mismatch, can't pathgroup. */ | |
461 | CIO_MSG_EVENT(0, "SNID - pgid mismatch for device " | |
462 | "0.%x.%04x, can't pathgroup\n", | |
78964268 CH |
463 | cdev->private->dev_id.ssid, |
464 | cdev->private->dev_id.devno); | |
7e560814 CH |
465 | cdev->private->options.pgroup = 0; |
466 | return; | |
467 | } | |
468 | if (cdev->private->pgid[last].inf.ps.state1 == | |
469 | SNID_STATE1_RESET) | |
470 | /* No previous pgid found */ | |
7c9f4e3a CH |
471 | memcpy(&cdev->private->pgid[0], |
472 | &channel_subsystems[0]->global_pgid, | |
7e560814 CH |
473 | sizeof(struct pgid)); |
474 | else | |
475 | /* Use existing pgid */ | |
476 | memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last], | |
477 | sizeof(struct pgid)); | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /* |
481 | * Function called from device_pgid.c after sense path ground has completed. | |
482 | */ | |
483 | void | |
484 | ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) | |
485 | { | |
486 | struct subchannel *sch; | |
487 | ||
488 | sch = to_subchannel(cdev->dev.parent); | |
489 | switch (err) { | |
7e560814 CH |
490 | case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ |
491 | cdev->private->options.pgroup = 0; | |
492 | break; | |
493 | case 0: /* success */ | |
494 | case -EACCES: /* partial success, some paths not operational */ | |
495 | /* Check if all pgids are equal or 0. */ | |
496 | __ccw_device_get_common_pgid(cdev); | |
1da177e4 LT |
497 | break; |
498 | case -ETIME: /* Sense path group id stopped by timeout. */ | |
499 | case -EUSERS: /* device is reserved for someone else. */ | |
500 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
7e560814 | 501 | return; |
1da177e4 LT |
502 | default: |
503 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
7e560814 | 504 | return; |
1da177e4 | 505 | } |
7e560814 | 506 | /* Start Path Group verification. */ |
7e560814 | 507 | cdev->private->state = DEV_STATE_VERIFY; |
28bdc6f6 | 508 | cdev->private->flags.doverify = 0; |
7e560814 | 509 | ccw_device_verify_start(cdev); |
1da177e4 LT |
510 | } |
511 | ||
512 | /* | |
513 | * Start device recognition. | |
514 | */ | |
515 | int | |
516 | ccw_device_recognition(struct ccw_device *cdev) | |
517 | { | |
518 | struct subchannel *sch; | |
519 | int ret; | |
520 | ||
1da177e4 | 521 | sch = to_subchannel(cdev->dev.parent); |
edf22096 | 522 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
523 | if (ret != 0) |
524 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
525 | return ret; | |
526 | ||
527 | /* After 60s the device recognition is considered to have failed. */ | |
528 | ccw_device_set_timeout(cdev, 60*HZ); | |
529 | ||
530 | /* | |
531 | * We used to start here with a sense pgid to find out whether a device | |
532 | * is locked by someone else. Unfortunately, the sense pgid command | |
533 | * code has other meanings on devices predating the path grouping | |
534 | * algorithm, so we start with sense id and box the device after an | |
535 | * timeout (or if sense pgid during path verification detects the device | |
536 | * is locked, as may happen on newer devices). | |
537 | */ | |
538 | cdev->private->flags.recog_done = 0; | |
539 | cdev->private->state = DEV_STATE_SENSE_ID; | |
540 | ccw_device_sense_id_start(cdev); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Handle timeout in device recognition. | |
546 | */ | |
547 | static void | |
548 | ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
549 | { | |
550 | int ret; | |
551 | ||
552 | ret = ccw_device_cancel_halt_clear(cdev); | |
553 | switch (ret) { | |
554 | case 0: | |
555 | ccw_device_recog_done(cdev, DEV_STATE_BOXED); | |
556 | break; | |
557 | case -ENODEV: | |
558 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
559 | break; | |
560 | default: | |
561 | ccw_device_set_timeout(cdev, 3*HZ); | |
562 | } | |
563 | } | |
564 | ||
565 | ||
1da177e4 LT |
566 | void |
567 | ccw_device_verify_done(struct ccw_device *cdev, int err) | |
568 | { | |
28bdc6f6 PO |
569 | struct subchannel *sch; |
570 | ||
571 | sch = to_subchannel(cdev->dev.parent); | |
572 | /* Update schib - pom may have changed. */ | |
cdb912a4 SO |
573 | if (cio_update_schib(sch)) { |
574 | cdev->private->flags.donotify = 0; | |
575 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
576 | return; | |
577 | } | |
28bdc6f6 PO |
578 | /* Update lpm with verified path mask. */ |
579 | sch->lpm = sch->vpm; | |
580 | /* Repeat path verification? */ | |
581 | if (cdev->private->flags.doverify) { | |
582 | cdev->private->flags.doverify = 0; | |
583 | ccw_device_verify_start(cdev); | |
584 | return; | |
585 | } | |
1da177e4 LT |
586 | switch (err) { |
587 | case -EOPNOTSUPP: /* path grouping not supported, just set online. */ | |
588 | cdev->private->options.pgroup = 0; | |
589 | case 0: | |
590 | ccw_device_done(cdev, DEV_STATE_ONLINE); | |
591 | /* Deliver fake irb to device driver, if needed. */ | |
592 | if (cdev->private->flags.fake_irb) { | |
593 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
23d805b6 PO |
594 | cdev->private->irb.scsw.cmd.cc = 1; |
595 | cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC; | |
596 | cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND; | |
597 | cdev->private->irb.scsw.cmd.stctl = | |
598 | SCSW_STCTL_STATUS_PEND; | |
1da177e4 LT |
599 | cdev->private->flags.fake_irb = 0; |
600 | if (cdev->handler) | |
601 | cdev->handler(cdev, cdev->private->intparm, | |
602 | &cdev->private->irb); | |
603 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
604 | } | |
605 | break; | |
606 | case -ETIME: | |
8b42f5c2 PO |
607 | /* Reset oper notify indication after verify error. */ |
608 | cdev->private->flags.donotify = 0; | |
1da177e4 LT |
609 | ccw_device_done(cdev, DEV_STATE_BOXED); |
610 | break; | |
611 | default: | |
8b42f5c2 PO |
612 | /* Reset oper notify indication after verify error. */ |
613 | cdev->private->flags.donotify = 0; | |
46258ab5 CH |
614 | if (cdev->online) { |
615 | ccw_device_set_timeout(cdev, 0); | |
3f4cf6e7 | 616 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
46258ab5 | 617 | } else |
ee04bbcc | 618 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
1da177e4 LT |
619 | break; |
620 | } | |
621 | } | |
622 | ||
623 | /* | |
624 | * Get device online. | |
625 | */ | |
626 | int | |
627 | ccw_device_online(struct ccw_device *cdev) | |
628 | { | |
629 | struct subchannel *sch; | |
630 | int ret; | |
631 | ||
632 | if ((cdev->private->state != DEV_STATE_OFFLINE) && | |
633 | (cdev->private->state != DEV_STATE_BOXED)) | |
634 | return -EINVAL; | |
635 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 636 | ret = cio_enable_subchannel(sch, (u32)(addr_t)sch); |
1da177e4 LT |
637 | if (ret != 0) { |
638 | /* Couldn't enable the subchannel for i/o. Sick device. */ | |
639 | if (ret == -ENODEV) | |
640 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
641 | return ret; | |
642 | } | |
643 | /* Do we want to do path grouping? */ | |
644 | if (!cdev->private->options.pgroup) { | |
7e560814 CH |
645 | /* Start initial path verification. */ |
646 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 647 | cdev->private->flags.doverify = 0; |
7e560814 | 648 | ccw_device_verify_start(cdev); |
1da177e4 LT |
649 | return 0; |
650 | } | |
651 | /* Do a SensePGID first. */ | |
652 | cdev->private->state = DEV_STATE_SENSE_PGID; | |
653 | ccw_device_sense_pgid_start(cdev); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | void | |
658 | ccw_device_disband_done(struct ccw_device *cdev, int err) | |
659 | { | |
660 | switch (err) { | |
661 | case 0: | |
662 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
663 | break; | |
664 | case -ETIME: | |
665 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
666 | break; | |
667 | default: | |
3ecb0a5a | 668 | cdev->private->flags.donotify = 0; |
3f4cf6e7 | 669 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); |
1da177e4 LT |
670 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); |
671 | break; | |
672 | } | |
673 | } | |
674 | ||
675 | /* | |
676 | * Shutdown device. | |
677 | */ | |
678 | int | |
679 | ccw_device_offline(struct ccw_device *cdev) | |
680 | { | |
681 | struct subchannel *sch; | |
682 | ||
b301ea8c PO |
683 | /* Allow ccw_device_offline while disconnected. */ |
684 | if (cdev->private->state == DEV_STATE_DISCONNECTED || | |
685 | cdev->private->state == DEV_STATE_NOT_OPER) { | |
686 | cdev->private->flags.donotify = 0; | |
687 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
688 | return 0; | |
689 | } | |
d7b5a4c9 CH |
690 | if (ccw_device_is_orphan(cdev)) { |
691 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
692 | return 0; | |
693 | } | |
1da177e4 | 694 | sch = to_subchannel(cdev->dev.parent); |
cdb912a4 | 695 | if (cio_update_schib(sch)) |
1da177e4 | 696 | return -ENODEV; |
23d805b6 | 697 | if (scsw_actl(&sch->schib.scsw) != 0) |
1da177e4 | 698 | return -EBUSY; |
23d805b6 PO |
699 | if (cdev->private->state != DEV_STATE_ONLINE) |
700 | return -EINVAL; | |
1da177e4 LT |
701 | /* Are we doing path grouping? */ |
702 | if (!cdev->private->options.pgroup) { | |
703 | /* No, set state offline immediately. */ | |
704 | ccw_device_done(cdev, DEV_STATE_OFFLINE); | |
705 | return 0; | |
706 | } | |
707 | /* Start Set Path Group commands. */ | |
708 | cdev->private->state = DEV_STATE_DISBAND_PGID; | |
709 | ccw_device_disband_start(cdev); | |
710 | return 0; | |
711 | } | |
712 | ||
713 | /* | |
714 | * Handle timeout in device online/offline process. | |
715 | */ | |
716 | static void | |
717 | ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
718 | { | |
719 | int ret; | |
720 | ||
721 | ret = ccw_device_cancel_halt_clear(cdev); | |
722 | switch (ret) { | |
723 | case 0: | |
724 | ccw_device_done(cdev, DEV_STATE_BOXED); | |
725 | break; | |
726 | case -ENODEV: | |
727 | ccw_device_done(cdev, DEV_STATE_NOT_OPER); | |
728 | break; | |
729 | default: | |
730 | ccw_device_set_timeout(cdev, 3*HZ); | |
731 | } | |
732 | } | |
733 | ||
734 | /* | |
735 | * Handle not oper event in device recognition. | |
736 | */ | |
737 | static void | |
738 | ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event) | |
739 | { | |
740 | ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER); | |
741 | } | |
742 | ||
743 | /* | |
3f4cf6e7 | 744 | * Handle not operational event in non-special state. |
1da177e4 | 745 | */ |
3f4cf6e7 CH |
746 | static void ccw_device_generic_notoper(struct ccw_device *cdev, |
747 | enum dev_event dev_event) | |
1da177e4 | 748 | { |
6afcc775 PO |
749 | if (!ccw_device_notify(cdev, CIO_GONE)) |
750 | ccw_device_schedule_sch_unregister(cdev); | |
751 | else | |
752 | ccw_device_set_disconnected(cdev); | |
1da177e4 LT |
753 | } |
754 | ||
1f1148c8 PO |
755 | /* |
756 | * Handle path verification event in offline state. | |
757 | */ | |
758 | static void ccw_device_offline_verify(struct ccw_device *cdev, | |
759 | enum dev_event dev_event) | |
760 | { | |
761 | struct subchannel *sch = to_subchannel(cdev->dev.parent); | |
762 | ||
763 | css_schedule_eval(sch->schid); | |
764 | } | |
765 | ||
1da177e4 LT |
766 | /* |
767 | * Handle path verification event. | |
768 | */ | |
769 | static void | |
770 | ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
771 | { | |
772 | struct subchannel *sch; | |
773 | ||
1da177e4 LT |
774 | if (cdev->private->state == DEV_STATE_W4SENSE) { |
775 | cdev->private->flags.doverify = 1; | |
776 | return; | |
777 | } | |
778 | sch = to_subchannel(cdev->dev.parent); | |
779 | /* | |
780 | * Since we might not just be coming from an interrupt from the | |
781 | * subchannel we have to update the schib. | |
782 | */ | |
cdb912a4 SO |
783 | if (cio_update_schib(sch)) { |
784 | ccw_device_verify_done(cdev, -ENODEV); | |
785 | return; | |
786 | } | |
1da177e4 | 787 | |
23d805b6 PO |
788 | if (scsw_actl(&sch->schib.scsw) != 0 || |
789 | (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) || | |
790 | (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) { | |
1da177e4 LT |
791 | /* |
792 | * No final status yet or final status not yet delivered | |
793 | * to the device driver. Can't do path verfication now, | |
794 | * delay until final status was delivered. | |
795 | */ | |
796 | cdev->private->flags.doverify = 1; | |
797 | return; | |
798 | } | |
799 | /* Device is idle, we can do the path verification. */ | |
800 | cdev->private->state = DEV_STATE_VERIFY; | |
28bdc6f6 | 801 | cdev->private->flags.doverify = 0; |
1da177e4 LT |
802 | ccw_device_verify_start(cdev); |
803 | } | |
804 | ||
805 | /* | |
806 | * Got an interrupt for a normal io (state online). | |
807 | */ | |
808 | static void | |
809 | ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
810 | { | |
811 | struct irb *irb; | |
83262d63 | 812 | int is_cmd; |
1da177e4 LT |
813 | |
814 | irb = (struct irb *) __LC_IRB; | |
83262d63 | 815 | is_cmd = !scsw_is_tm(&irb->scsw); |
1da177e4 | 816 | /* Check for unsolicited interrupt. */ |
23d805b6 | 817 | if (!scsw_is_solicited(&irb->scsw)) { |
83262d63 | 818 | if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) && |
1da177e4 LT |
819 | !irb->esw.esw0.erw.cons) { |
820 | /* Unit check but no sense data. Need basic sense. */ | |
821 | if (ccw_device_do_sense(cdev, irb) != 0) | |
822 | goto call_handler_unsol; | |
e0ec5749 | 823 | memcpy(&cdev->private->irb, irb, sizeof(struct irb)); |
1da177e4 LT |
824 | cdev->private->state = DEV_STATE_W4SENSE; |
825 | cdev->private->intparm = 0; | |
826 | return; | |
827 | } | |
828 | call_handler_unsol: | |
829 | if (cdev->handler) | |
830 | cdev->handler (cdev, 0, irb); | |
18374d37 CH |
831 | if (cdev->private->flags.doverify) |
832 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
833 | return; |
834 | } | |
835 | /* Accumulate status and find out if a basic sense is needed. */ | |
836 | ccw_device_accumulate_irb(cdev, irb); | |
83262d63 | 837 | if (is_cmd && cdev->private->flags.dosense) { |
1da177e4 LT |
838 | if (ccw_device_do_sense(cdev, irb) == 0) { |
839 | cdev->private->state = DEV_STATE_W4SENSE; | |
840 | } | |
841 | return; | |
842 | } | |
843 | /* Call the handler. */ | |
844 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
845 | /* Start delayed path verification. */ | |
846 | ccw_device_online_verify(cdev, 0); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Got an timeout in online state. | |
851 | */ | |
852 | static void | |
853 | ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
854 | { | |
855 | int ret; | |
856 | ||
857 | ccw_device_set_timeout(cdev, 0); | |
858 | ret = ccw_device_cancel_halt_clear(cdev); | |
859 | if (ret == -EBUSY) { | |
860 | ccw_device_set_timeout(cdev, 3*HZ); | |
861 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
862 | return; | |
863 | } | |
3f4cf6e7 CH |
864 | if (ret == -ENODEV) |
865 | dev_fsm_event(cdev, DEV_EVENT_NOTOPER); | |
866 | else if (cdev->handler) | |
1da177e4 LT |
867 | cdev->handler(cdev, cdev->private->intparm, |
868 | ERR_PTR(-ETIMEDOUT)); | |
869 | } | |
870 | ||
871 | /* | |
872 | * Got an interrupt for a basic sense. | |
873 | */ | |
2b67fc46 | 874 | static void |
1da177e4 LT |
875 | ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event) |
876 | { | |
877 | struct irb *irb; | |
878 | ||
879 | irb = (struct irb *) __LC_IRB; | |
880 | /* Check for unsolicited interrupt. */ | |
23d805b6 PO |
881 | if (scsw_stctl(&irb->scsw) == |
882 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { | |
883 | if (scsw_cc(&irb->scsw) == 1) | |
1da177e4 LT |
884 | /* Basic sense hasn't started. Try again. */ |
885 | ccw_device_do_sense(cdev, irb); | |
886 | else { | |
139b83dd | 887 | CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited " |
e556bbbd CH |
888 | "interrupt during w4sense...\n", |
889 | cdev->private->dev_id.ssid, | |
890 | cdev->private->dev_id.devno); | |
1da177e4 LT |
891 | if (cdev->handler) |
892 | cdev->handler (cdev, 0, irb); | |
893 | } | |
894 | return; | |
895 | } | |
3ba1998e CH |
896 | /* |
897 | * Check if a halt or clear has been issued in the meanwhile. If yes, | |
898 | * only deliver the halt/clear interrupt to the device driver as if it | |
899 | * had killed the original request. | |
900 | */ | |
23d805b6 PO |
901 | if (scsw_fctl(&irb->scsw) & |
902 | (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) { | |
d23861ff CH |
903 | /* Retry Basic Sense if requested. */ |
904 | if (cdev->private->flags.intretry) { | |
905 | cdev->private->flags.intretry = 0; | |
906 | ccw_device_do_sense(cdev, irb); | |
907 | return; | |
908 | } | |
3ba1998e CH |
909 | cdev->private->flags.dosense = 0; |
910 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
911 | ccw_device_accumulate_irb(cdev, irb); | |
912 | goto call_handler; | |
913 | } | |
1da177e4 LT |
914 | /* Add basic sense info to irb. */ |
915 | ccw_device_accumulate_basic_sense(cdev, irb); | |
916 | if (cdev->private->flags.dosense) { | |
917 | /* Another basic sense is needed. */ | |
918 | ccw_device_do_sense(cdev, irb); | |
919 | return; | |
920 | } | |
3ba1998e | 921 | call_handler: |
1da177e4 | 922 | cdev->private->state = DEV_STATE_ONLINE; |
217ee6c6 ME |
923 | /* In case sensing interfered with setting the device online */ |
924 | wake_up(&cdev->private->wait_q); | |
1da177e4 LT |
925 | /* Call the handler. */ |
926 | if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify) | |
927 | /* Start delayed path verification. */ | |
928 | ccw_device_online_verify(cdev, 0); | |
929 | } | |
930 | ||
931 | static void | |
932 | ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event) | |
933 | { | |
934 | struct irb *irb; | |
935 | ||
936 | irb = (struct irb *) __LC_IRB; | |
937 | /* Accumulate status. We don't do basic sense. */ | |
938 | ccw_device_accumulate_irb(cdev, irb); | |
b4f7b1ee CH |
939 | /* Remember to clear irb to avoid residuals. */ |
940 | memset(&cdev->private->irb, 0, sizeof(struct irb)); | |
1da177e4 LT |
941 | /* Try to start delayed device verification. */ |
942 | ccw_device_online_verify(cdev, 0); | |
943 | /* Note: Don't call handler for cio initiated clear! */ | |
944 | } | |
945 | ||
946 | static void | |
947 | ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
948 | { | |
949 | struct subchannel *sch; | |
950 | ||
951 | sch = to_subchannel(cdev->dev.parent); | |
952 | ccw_device_set_timeout(cdev, 0); | |
7c8427c3 CH |
953 | /* Start delayed path verification. */ |
954 | ccw_device_online_verify(cdev, 0); | |
1da177e4 | 955 | /* OK, i/o is dead now. Call interrupt handler. */ |
1da177e4 LT |
956 | if (cdev->handler) |
957 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 958 | ERR_PTR(-EIO)); |
1da177e4 LT |
959 | } |
960 | ||
961 | static void | |
962 | ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
963 | { | |
964 | int ret; | |
965 | ||
966 | ret = ccw_device_cancel_halt_clear(cdev); | |
967 | if (ret == -EBUSY) { | |
968 | ccw_device_set_timeout(cdev, 3*HZ); | |
969 | return; | |
970 | } | |
7c8427c3 CH |
971 | /* Start delayed path verification. */ |
972 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
973 | if (cdev->handler) |
974 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 975 | ERR_PTR(-EIO)); |
1da177e4 LT |
976 | } |
977 | ||
c820de39 | 978 | void ccw_device_kill_io(struct ccw_device *cdev) |
1da177e4 LT |
979 | { |
980 | int ret; | |
1da177e4 | 981 | |
1da177e4 LT |
982 | ret = ccw_device_cancel_halt_clear(cdev); |
983 | if (ret == -EBUSY) { | |
984 | ccw_device_set_timeout(cdev, 3*HZ); | |
985 | cdev->private->state = DEV_STATE_TIMEOUT_KILL; | |
986 | return; | |
987 | } | |
7c8427c3 CH |
988 | /* Start delayed path verification. */ |
989 | ccw_device_online_verify(cdev, 0); | |
1da177e4 LT |
990 | if (cdev->handler) |
991 | cdev->handler(cdev, cdev->private->intparm, | |
e7769b48 | 992 | ERR_PTR(-EIO)); |
1da177e4 LT |
993 | } |
994 | ||
995 | static void | |
28bdc6f6 | 996 | ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event) |
1da177e4 | 997 | { |
28bdc6f6 | 998 | /* Start verification after current task finished. */ |
7e560814 | 999 | cdev->private->flags.doverify = 1; |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | static void | |
1003 | ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1004 | { | |
1005 | struct irb *irb; | |
1006 | ||
1007 | switch (dev_event) { | |
1008 | case DEV_EVENT_INTERRUPT: | |
1009 | irb = (struct irb *) __LC_IRB; | |
1010 | /* Check for unsolicited interrupt. */ | |
23d805b6 | 1011 | if ((scsw_stctl(&irb->scsw) == |
1da177e4 | 1012 | (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) && |
23d805b6 | 1013 | (!scsw_cc(&irb->scsw))) |
1da177e4 LT |
1014 | /* FIXME: we should restart stlck here, but this |
1015 | * is extremely unlikely ... */ | |
1016 | goto out_wakeup; | |
1017 | ||
1018 | ccw_device_accumulate_irb(cdev, irb); | |
1019 | /* We don't care about basic sense etc. */ | |
1020 | break; | |
1021 | default: /* timeout */ | |
1022 | break; | |
1023 | } | |
1024 | out_wakeup: | |
1025 | wake_up(&cdev->private->wait_q); | |
1026 | } | |
1027 | ||
1028 | static void | |
1029 | ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event) | |
1030 | { | |
1031 | struct subchannel *sch; | |
1032 | ||
1033 | sch = to_subchannel(cdev->dev.parent); | |
edf22096 | 1034 | if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0) |
1da177e4 LT |
1035 | /* Couldn't enable the subchannel for i/o. Sick device. */ |
1036 | return; | |
1037 | ||
1038 | /* After 60s the device recognition is considered to have failed. */ | |
1039 | ccw_device_set_timeout(cdev, 60*HZ); | |
1040 | ||
1041 | cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID; | |
1042 | ccw_device_sense_id_start(cdev); | |
1043 | } | |
1044 | ||
c820de39 | 1045 | void ccw_device_trigger_reprobe(struct ccw_device *cdev) |
1da177e4 | 1046 | { |
c820de39 | 1047 | struct subchannel *sch; |
1da177e4 | 1048 | |
1da177e4 LT |
1049 | if (cdev->private->state != DEV_STATE_DISCONNECTED) |
1050 | return; | |
1051 | ||
c820de39 | 1052 | sch = to_subchannel(cdev->dev.parent); |
1da177e4 | 1053 | /* Update some values. */ |
cdb912a4 | 1054 | if (cio_update_schib(sch)) |
7674da77 | 1055 | return; |
1da177e4 LT |
1056 | /* |
1057 | * The pim, pam, pom values may not be accurate, but they are the best | |
1058 | * we have before performing device selection :/ | |
1059 | */ | |
28bdc6f6 | 1060 | sch->lpm = sch->schib.pmcw.pam & sch->opm; |
13952ec1 SO |
1061 | /* |
1062 | * Use the initial configuration since we can't be shure that the old | |
1063 | * paths are valid. | |
1064 | */ | |
1065 | io_subchannel_init_config(sch); | |
f444cc0e SO |
1066 | if (cio_commit_config(sch)) |
1067 | return; | |
13952ec1 | 1068 | |
1da177e4 | 1069 | /* We should also udate ssd info, but this has to wait. */ |
d7b5a4c9 CH |
1070 | /* Check if this is another device which appeared on the same sch. */ |
1071 | if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { | |
1072 | PREPARE_WORK(&cdev->private->kick_work, | |
1073 | ccw_device_move_to_orphanage); | |
c5d4a999 | 1074 | queue_work(slow_path_wq, &cdev->private->kick_work); |
d7b5a4c9 CH |
1075 | } else |
1076 | ccw_device_start_id(cdev, 0); | |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | static void | |
1080 | ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event) | |
1081 | { | |
1082 | struct subchannel *sch; | |
1083 | ||
1084 | sch = to_subchannel(cdev->dev.parent); | |
1085 | /* | |
1086 | * An interrupt in state offline means a previous disable was not | |
ed04b892 | 1087 | * successful - should not happen, but we try to disable again. |
1da177e4 LT |
1088 | */ |
1089 | cio_disable_subchannel(sch); | |
1090 | } | |
1091 | ||
1092 | static void | |
1093 | ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event) | |
1094 | { | |
1095 | retry_set_schib(cdev); | |
1096 | cdev->private->state = DEV_STATE_ONLINE; | |
1097 | dev_fsm_event(cdev, dev_event); | |
1098 | } | |
1099 | ||
94bb0633 CH |
1100 | static void ccw_device_update_cmfblock(struct ccw_device *cdev, |
1101 | enum dev_event dev_event) | |
1102 | { | |
1103 | cmf_retry_copy_block(cdev); | |
1104 | cdev->private->state = DEV_STATE_ONLINE; | |
1105 | dev_fsm_event(cdev, dev_event); | |
1106 | } | |
1da177e4 LT |
1107 | |
1108 | static void | |
1109 | ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event) | |
1110 | { | |
1111 | ccw_device_set_timeout(cdev, 0); | |
1112 | if (dev_event == DEV_EVENT_NOTOPER) | |
1113 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1114 | else | |
1115 | cdev->private->state = DEV_STATE_OFFLINE; | |
1116 | wake_up(&cdev->private->wait_q); | |
1117 | } | |
1118 | ||
1119 | static void | |
1120 | ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event) | |
1121 | { | |
1122 | int ret; | |
1123 | ||
1124 | ret = ccw_device_cancel_halt_clear(cdev); | |
1125 | switch (ret) { | |
1126 | case 0: | |
1127 | cdev->private->state = DEV_STATE_OFFLINE; | |
1128 | wake_up(&cdev->private->wait_q); | |
1129 | break; | |
1130 | case -ENODEV: | |
1131 | cdev->private->state = DEV_STATE_NOT_OPER; | |
1132 | wake_up(&cdev->private->wait_q); | |
1133 | break; | |
1134 | default: | |
1135 | ccw_device_set_timeout(cdev, HZ/10); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * No operation action. This is used e.g. to ignore a timeout event in | |
1141 | * state offline. | |
1142 | */ | |
1143 | static void | |
1144 | ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event) | |
1145 | { | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Bug operation action. | |
1150 | */ | |
1151 | static void | |
1152 | ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event) | |
1153 | { | |
139b83dd ME |
1154 | CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device " |
1155 | "0.%x.%04x\n", cdev->private->state, dev_event, | |
1156 | cdev->private->dev_id.ssid, | |
1157 | cdev->private->dev_id.devno); | |
1da177e4 LT |
1158 | BUG(); |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * device statemachine | |
1163 | */ | |
1164 | fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = { | |
1165 | [DEV_STATE_NOT_OPER] = { | |
1166 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1167 | [DEV_EVENT_INTERRUPT] = ccw_device_bug, | |
1168 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1169 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1170 | }, | |
1171 | [DEV_STATE_SENSE_PGID] = { | |
3f4cf6e7 | 1172 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1173 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq, |
1174 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1175 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1176 | }, | |
1177 | [DEV_STATE_SENSE_ID] = { | |
1178 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1179 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1180 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1181 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1182 | }, | |
1183 | [DEV_STATE_OFFLINE] = { | |
3f4cf6e7 | 1184 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1185 | [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq, |
1186 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1f1148c8 | 1187 | [DEV_EVENT_VERIFY] = ccw_device_offline_verify, |
1da177e4 LT |
1188 | }, |
1189 | [DEV_STATE_VERIFY] = { | |
3f4cf6e7 | 1190 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1191 | [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq, |
1192 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
28bdc6f6 | 1193 | [DEV_EVENT_VERIFY] = ccw_device_delay_verify, |
1da177e4 LT |
1194 | }, |
1195 | [DEV_STATE_ONLINE] = { | |
3f4cf6e7 | 1196 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1197 | [DEV_EVENT_INTERRUPT] = ccw_device_irq, |
1198 | [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout, | |
1199 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1200 | }, | |
1201 | [DEV_STATE_W4SENSE] = { | |
3f4cf6e7 | 1202 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1203 | [DEV_EVENT_INTERRUPT] = ccw_device_w4sense, |
1204 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1205 | [DEV_EVENT_VERIFY] = ccw_device_online_verify, | |
1206 | }, | |
1207 | [DEV_STATE_DISBAND_PGID] = { | |
3f4cf6e7 | 1208 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1209 | [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq, |
1210 | [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout, | |
1211 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1212 | }, | |
1213 | [DEV_STATE_BOXED] = { | |
3f4cf6e7 | 1214 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1215 | [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done, |
1216 | [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done, | |
1217 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1218 | }, | |
1219 | /* states to wait for i/o completion before doing something */ | |
1220 | [DEV_STATE_CLEAR_VERIFY] = { | |
3f4cf6e7 | 1221 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1222 | [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify, |
1223 | [DEV_EVENT_TIMEOUT] = ccw_device_nop, | |
1224 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1225 | }, | |
1226 | [DEV_STATE_TIMEOUT_KILL] = { | |
3f4cf6e7 | 1227 | [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper, |
1da177e4 LT |
1228 | [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq, |
1229 | [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout, | |
1230 | [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME | |
1231 | }, | |
1da177e4 LT |
1232 | [DEV_STATE_QUIESCE] = { |
1233 | [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done, | |
1234 | [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done, | |
1235 | [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout, | |
1236 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1237 | }, | |
1238 | /* special states for devices gone not operational */ | |
1239 | [DEV_STATE_DISCONNECTED] = { | |
1240 | [DEV_EVENT_NOTOPER] = ccw_device_nop, | |
1241 | [DEV_EVENT_INTERRUPT] = ccw_device_start_id, | |
1242 | [DEV_EVENT_TIMEOUT] = ccw_device_bug, | |
28bdc6f6 | 1243 | [DEV_EVENT_VERIFY] = ccw_device_start_id, |
1da177e4 LT |
1244 | }, |
1245 | [DEV_STATE_DISCONNECTED_SENSE_ID] = { | |
1246 | [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper, | |
1247 | [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq, | |
1248 | [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout, | |
1249 | [DEV_EVENT_VERIFY] = ccw_device_nop, | |
1250 | }, | |
1251 | [DEV_STATE_CMFCHANGE] = { | |
1252 | [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate, | |
1253 | [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate, | |
1254 | [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate, | |
1255 | [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate, | |
1256 | }, | |
94bb0633 CH |
1257 | [DEV_STATE_CMFUPDATE] = { |
1258 | [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock, | |
1259 | [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock, | |
1260 | [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock, | |
1261 | [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock, | |
1262 | }, | |
1da177e4 LT |
1263 | }; |
1264 | ||
1da177e4 | 1265 | EXPORT_SYMBOL_GPL(ccw_device_set_timeout); |