projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge commit 'linus' into next
[deliverable/linux.git] / drivers / s390 / cio / device_fsm.c
CommitLineData
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		 27static int timeout_log_enabled;
28
14ff56bb
SO		 29static 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
37static 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 */
95static void
96ccw_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 */
111void
112ccw_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 */
136int
137ccw_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 180void 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		 189int 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 202static 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 */
224static void
225ccw_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
ec64333c
SO		 232 if (cio_disable_subchannel(sch))
233 state = DEV_STATE_NOT_OPER;
1da177e4
LT		 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:
1da177e4
LT		 266 break;
267 case DEV_STATE_OFFLINE:
823d494a
SO		 268 if (!cdev->online) {
269 ccw_device_update_sense_data(cdev);
823d494a 270 break;
1da177e4 271 }
823d494a
SO		 272 cdev->private->state = DEV_STATE_OFFLINE;
273 cdev->private->flags.recog_done = 1;
274 if (ccw_device_test_sense_data(cdev)) {
275 cdev->private->flags.donotify = 1;
276 ccw_device_online(cdev);
277 wake_up(&cdev->private->wait_q);
278 } else {
279 ccw_device_update_sense_data(cdev);
37de53bb 280 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1da177e4 281 }
823d494a 282 return;
1da177e4 283 case DEV_STATE_BOXED:
47593bfa
SO		 284 if (cdev->id.cu_type != 0) { /* device was recognized before */
285 cdev->private->flags.recog_done = 1;
286 cdev->private->state = DEV_STATE_BOXED;
287 wake_up(&cdev->private->wait_q);
288 return;
289 }
1da177e4
LT		 290 break;
291 }
292 cdev->private->state = state;
293 io_subchannel_recog_done(cdev);
156013ff 294 wake_up(&cdev->private->wait_q);
1da177e4
LT		 295}
296
297/*
298 * Function called from device_id.c after sense id has completed.
299 */
300void
301ccw_device_sense_id_done(struct ccw_device *cdev, int err)
302{
303 switch (err) {
304 case 0:
305 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
306 break;
307 case -ETIME: /* Sense id stopped by timeout. */
308 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
309 break;
310 default:
311 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
312 break;
313 }
314}
315
c820de39
CH		 316int ccw_device_notify(struct ccw_device *cdev, int event)
317{
318 if (!cdev->drv)
319 return 0;
320 if (!cdev->online)
321 return 0;
91c36919
PO		 322 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
323 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
324 event);
c820de39
CH		 325 return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
326}
327
91c36919
PO		 328static void ccw_device_oper_notify(struct ccw_device *cdev)
329{
330 if (ccw_device_notify(cdev, CIO_OPER)) {
94bb0633 331 /* Reenable channel measurements, if needed. */
37de53bb 332 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
91c36919
PO		 333 return;
334 }
335 /* Driver doesn't want device back. */
336 ccw_device_set_notoper(cdev);
37de53bb 337 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1da177e4
LT		 338}
339
340/*
341 * Finished with online/offline processing.
342 */
343static void
344ccw_device_done(struct ccw_device *cdev, int state)
345{
346 struct subchannel *sch;
347
348 sch = to_subchannel(cdev->dev.parent);
349
f1ee3281
CH		 350 ccw_device_set_timeout(cdev, 0);
351
1da177e4
LT		 352 if (state != DEV_STATE_ONLINE)
353 cio_disable_subchannel(sch);
354
355 /* Reset device status. */
356 memset(&cdev->private->irb, 0, sizeof(struct irb));
357
358 cdev->private->state = state;
359
9a332116
PO		 360 switch (state) {
361 case DEV_STATE_BOXED:
139b83dd
ME		 362 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
363 cdev->private->dev_id.devno, sch->schid.sch_no);
47593bfa 364 if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED))
37de53bb 365 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
47593bfa 366 cdev->private->flags.donotify = 0;
9a332116
PO		 367 break;
368 case DEV_STATE_NOT_OPER:
626e476a
SO		 369 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
370 cdev->private->dev_id.devno, sch->schid.sch_no);
371 if (!ccw_device_notify(cdev, CIO_GONE))
37de53bb 372 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 373 else
374 ccw_device_set_disconnected(cdev);
626e476a 375 cdev->private->flags.donotify = 0;
9a332116
PO		 376 break;
377 case DEV_STATE_DISCONNECTED:
378 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
379 "%04x\n", cdev->private->dev_id.devno,
380 sch->schid.sch_no);
381 if (!ccw_device_notify(cdev, CIO_NO_PATH))
37de53bb 382 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
9a332116
PO		 383 else
384 ccw_device_set_disconnected(cdev);
385 cdev->private->flags.donotify = 0;
386 break;
387 default:
388 break;
626e476a 389 }
1da177e4
LT		 390
391 if (cdev->private->flags.donotify) {
392 cdev->private->flags.donotify = 0;
91c36919 393 ccw_device_oper_notify(cdev);
1da177e4
LT		 394 }
395 wake_up(&cdev->private->wait_q);
1da177e4
LT		 396}
397
1da177e4
LT		 398/*
399 * Start device recognition.
400 */
736b5db8 401void ccw_device_recognition(struct ccw_device *cdev)
1da177e4 402{
736b5db8 403 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1da177e4
LT		 404
405 /*
406 * We used to start here with a sense pgid to find out whether a device
407 * is locked by someone else. Unfortunately, the sense pgid command
408 * code has other meanings on devices predating the path grouping
409 * algorithm, so we start with sense id and box the device after an
410 * timeout (or if sense pgid during path verification detects the device
411 * is locked, as may happen on newer devices).
412 */
413 cdev->private->flags.recog_done = 0;
414 cdev->private->state = DEV_STATE_SENSE_ID;
736b5db8
PO		 415 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
416 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
417 return;
418 }
1da177e4 419 ccw_device_sense_id_start(cdev);
1da177e4
LT		 420}
421
422/*
39f5360b 423 * Handle events for states that use the ccw request infrastructure.
1da177e4 424 */
39f5360b 425static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
1da177e4 426{
39f5360b
PO		 427 switch (e) {
428 case DEV_EVENT_NOTOPER:
429 ccw_request_notoper(cdev);
1da177e4 430 break;
39f5360b
PO		 431 case DEV_EVENT_INTERRUPT:
432 ccw_request_handler(cdev);
433 break;
434 case DEV_EVENT_TIMEOUT:
435 ccw_request_timeout(cdev);
1da177e4
LT		 436 break;
437 default:
39f5360b 438 break;
1da177e4
LT		 439 }
440}
441
1da177e4
LT		 442void
443ccw_device_verify_done(struct ccw_device *cdev, int err)
444{
28bdc6f6
PO		 445 struct subchannel *sch;
446
447 sch = to_subchannel(cdev->dev.parent);
448 /* Update schib - pom may have changed. */
cdb912a4 449 if (cio_update_schib(sch)) {
7c4d964f
PO		 450 err = -ENODEV;
451 goto callback;
cdb912a4 452 }
28bdc6f6
PO		 453 /* Update lpm with verified path mask. */
454 sch->lpm = sch->vpm;
455 /* Repeat path verification? */
456 if (cdev->private->flags.doverify) {
28bdc6f6
PO		 457 ccw_device_verify_start(cdev);
458 return;
459 }
7c4d964f 460callback:
1da177e4 461 switch (err) {
1da177e4
LT		 462 case 0:
463 ccw_device_done(cdev, DEV_STATE_ONLINE);
464 /* Deliver fake irb to device driver, if needed. */
465 if (cdev->private->flags.fake_irb) {
466 memset(&cdev->private->irb, 0, sizeof(struct irb));
23d805b6
PO		 467 cdev->private->irb.scsw.cmd.cc = 1;
468 cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
469 cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
470 cdev->private->irb.scsw.cmd.stctl =
471 SCSW_STCTL_STATUS_PEND;
1da177e4
LT		 472 cdev->private->flags.fake_irb = 0;
473 if (cdev->handler)
474 cdev->handler(cdev, cdev->private->intparm,
475 &cdev->private->irb);
476 memset(&cdev->private->irb, 0, sizeof(struct irb));
477 }
478 break;
479 case -ETIME:
52ef0608 480 case -EUSERS:
8b42f5c2
PO		 481 /* Reset oper notify indication after verify error. */
482 cdev->private->flags.donotify = 0;
1da177e4
LT		 483 ccw_device_done(cdev, DEV_STATE_BOXED);
484 break;
7c4d964f
PO		 485 case -EACCES:
486 /* Reset oper notify indication after verify error. */
487 cdev->private->flags.donotify = 0;
488 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
489 break;
1da177e4 490 default:
8b42f5c2
PO		 491 /* Reset oper notify indication after verify error. */
492 cdev->private->flags.donotify = 0;
7c4d964f 493 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
1da177e4
LT		 494 break;
495 }
496}
497
498/*
499 * Get device online.
500 */
501int
502ccw_device_online(struct ccw_device *cdev)
503{
504 struct subchannel *sch;
505 int ret;
506
507 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
508 (cdev->private->state != DEV_STATE_BOXED))
509 return -EINVAL;
510 sch = to_subchannel(cdev->dev.parent);
edf22096 511 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1da177e4
LT		 512 if (ret != 0) {
513 /* Couldn't enable the subchannel for i/o. Sick device. */
514 if (ret == -ENODEV)
515 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
516 return ret;
517 }
52ef0608
PO		 518 /* Start initial path verification. */
519 cdev->private->state = DEV_STATE_VERIFY;
520 ccw_device_verify_start(cdev);
1da177e4
LT		 521 return 0;
522}
523
524void
525ccw_device_disband_done(struct ccw_device *cdev, int err)
526{
527 switch (err) {
528 case 0:
529 ccw_device_done(cdev, DEV_STATE_OFFLINE);
530 break;
531 case -ETIME:
532 ccw_device_done(cdev, DEV_STATE_BOXED);
533 break;
534 default:
3ecb0a5a 535 cdev->private->flags.donotify = 0;
1da177e4
LT		 536 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
537 break;
538 }
539}
540
541/*
542 * Shutdown device.
543 */
544int
545ccw_device_offline(struct ccw_device *cdev)
546{
547 struct subchannel *sch;
548
b301ea8c
PO		 549 /* Allow ccw_device_offline while disconnected. */
550 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
551 cdev->private->state == DEV_STATE_NOT_OPER) {
552 cdev->private->flags.donotify = 0;
553 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
554 return 0;
555 }
102e835d
PO		 556 if (cdev->private->state == DEV_STATE_BOXED) {
557 ccw_device_done(cdev, DEV_STATE_BOXED);
558 return 0;
559 }
d7b5a4c9
CH		 560 if (ccw_device_is_orphan(cdev)) {
561 ccw_device_done(cdev, DEV_STATE_OFFLINE);
562 return 0;
563 }
1da177e4 564 sch = to_subchannel(cdev->dev.parent);
cdb912a4 565 if (cio_update_schib(sch))
1da177e4 566 return -ENODEV;
23d805b6 567 if (scsw_actl(&sch->schib.scsw) != 0)
1da177e4 568 return -EBUSY;
23d805b6
PO		 569 if (cdev->private->state != DEV_STATE_ONLINE)
570 return -EINVAL;
1da177e4 571 /* Are we doing path grouping? */
454e1fa1 572 if (!cdev->private->flags.pgroup) {
1da177e4
LT		 573 /* No, set state offline immediately. */
574 ccw_device_done(cdev, DEV_STATE_OFFLINE);
575 return 0;
576 }
577 /* Start Set Path Group commands. */
578 cdev->private->state = DEV_STATE_DISBAND_PGID;
579 ccw_device_disband_start(cdev);
580 return 0;
581}
582
1da177e4 583/*
3f4cf6e7 584 * Handle not operational event in non-special state.
1da177e4 585 */
3f4cf6e7
CH		 586static void ccw_device_generic_notoper(struct ccw_device *cdev,
587 enum dev_event dev_event)
1da177e4 588{
6afcc775 589 if (!ccw_device_notify(cdev, CIO_GONE))
37de53bb 590 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 591 else
592 ccw_device_set_disconnected(cdev);
1da177e4
LT		 593}
594
1f1148c8
PO		 595/*
596 * Handle path verification event in offline state.
597 */
598static void ccw_device_offline_verify(struct ccw_device *cdev,
599 enum dev_event dev_event)
600{
601 struct subchannel *sch = to_subchannel(cdev->dev.parent);
602
603 css_schedule_eval(sch->schid);
604}
605
1da177e4
LT		 606/*
607 * Handle path verification event.
608 */
609static void
610ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
611{
612 struct subchannel *sch;
613
1da177e4
LT		 614 if (cdev->private->state == DEV_STATE_W4SENSE) {
615 cdev->private->flags.doverify = 1;
616 return;
617 }
618 sch = to_subchannel(cdev->dev.parent);
619 /*
620 * Since we might not just be coming from an interrupt from the
621 * subchannel we have to update the schib.
622 */
cdb912a4
SO		 623 if (cio_update_schib(sch)) {
624 ccw_device_verify_done(cdev, -ENODEV);
625 return;
626 }
1da177e4 627
23d805b6
PO		 628 if (scsw_actl(&sch->schib.scsw) != 0 ||
629 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
630 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
1da177e4
LT		 631 /*
632 * No final status yet or final status not yet delivered
633 * to the device driver. Can't do path verfication now,
634 * delay until final status was delivered.
635 */
636 cdev->private->flags.doverify = 1;
637 return;
638 }
639 /* Device is idle, we can do the path verification. */
640 cdev->private->state = DEV_STATE_VERIFY;
641 ccw_device_verify_start(cdev);
642}
643
d7d12ef2
PO		 644/*
645 * Handle path verification event in boxed state.
646 */
647static void ccw_device_boxed_verify(struct ccw_device *cdev,
648 enum dev_event dev_event)
649{
650 struct subchannel *sch = to_subchannel(cdev->dev.parent);
651
652 if (cdev->online) {
653 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
654 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
655 else
656 ccw_device_online_verify(cdev, dev_event);
657 } else
658 css_schedule_eval(sch->schid);
659}
660
1da177e4
LT		 661/*
662 * Got an interrupt for a normal io (state online).
663 */
664static void
665ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
666{
667 struct irb *irb;
83262d63 668 int is_cmd;
1da177e4
LT		 669
670 irb = (struct irb *) __LC_IRB;
83262d63 671 is_cmd = !scsw_is_tm(&irb->scsw);
1da177e4 672 /* Check for unsolicited interrupt. */
23d805b6 673 if (!scsw_is_solicited(&irb->scsw)) {
83262d63 674 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1da177e4
LT		 675 !irb->esw.esw0.erw.cons) {
676 /* Unit check but no sense data. Need basic sense. */
677 if (ccw_device_do_sense(cdev, irb) != 0)
678 goto call_handler_unsol;
e0ec5749 679 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 680 cdev->private->state = DEV_STATE_W4SENSE;
681 cdev->private->intparm = 0;
682 return;
683 }
684call_handler_unsol:
685 if (cdev->handler)
686 cdev->handler (cdev, 0, irb);
18374d37
CH		 687 if (cdev->private->flags.doverify)
688 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 689 return;
690 }
691 /* Accumulate status and find out if a basic sense is needed. */
692 ccw_device_accumulate_irb(cdev, irb);
83262d63 693 if (is_cmd && cdev->private->flags.dosense) {
1da177e4
LT		 694 if (ccw_device_do_sense(cdev, irb) == 0) {
695 cdev->private->state = DEV_STATE_W4SENSE;
696 }
697 return;
698 }
699 /* Call the handler. */
700 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
701 /* Start delayed path verification. */
702 ccw_device_online_verify(cdev, 0);
703}
704
705/*
706 * Got an timeout in online state.
707 */
708static void
709ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
710{
711 int ret;
712
713 ccw_device_set_timeout(cdev, 0);
714 ret = ccw_device_cancel_halt_clear(cdev);
715 if (ret == -EBUSY) {
716 ccw_device_set_timeout(cdev, 3*HZ);
717 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
718 return;
719 }
3f4cf6e7
CH		 720 if (ret == -ENODEV)
721 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
722 else if (cdev->handler)
1da177e4
LT		 723 cdev->handler(cdev, cdev->private->intparm,
724 ERR_PTR(-ETIMEDOUT));
725}
726
727/*
728 * Got an interrupt for a basic sense.
729 */
2b67fc46 730static void
1da177e4
LT		 731ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
732{
733 struct irb *irb;
734
735 irb = (struct irb *) __LC_IRB;
736 /* Check for unsolicited interrupt. */
23d805b6
PO		 737 if (scsw_stctl(&irb->scsw) ==
738 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
739 if (scsw_cc(&irb->scsw) == 1)
1da177e4
LT		 740 /* Basic sense hasn't started. Try again. */
741 ccw_device_do_sense(cdev, irb);
742 else {
139b83dd 743 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
e556bbbd
CH		 744 "interrupt during w4sense...\n",
745 cdev->private->dev_id.ssid,
746 cdev->private->dev_id.devno);
1da177e4
LT		 747 if (cdev->handler)
748 cdev->handler (cdev, 0, irb);
749 }
750 return;
751 }
3ba1998e
CH		 752 /*
753 * Check if a halt or clear has been issued in the meanwhile. If yes,
754 * only deliver the halt/clear interrupt to the device driver as if it
755 * had killed the original request.
756 */
23d805b6
PO		 757 if (scsw_fctl(&irb->scsw) &
758 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
3ba1998e
CH		 759 cdev->private->flags.dosense = 0;
760 memset(&cdev->private->irb, 0, sizeof(struct irb));
761 ccw_device_accumulate_irb(cdev, irb);
762 goto call_handler;
763 }
1da177e4
LT		 764 /* Add basic sense info to irb. */
765 ccw_device_accumulate_basic_sense(cdev, irb);
766 if (cdev->private->flags.dosense) {
767 /* Another basic sense is needed. */
768 ccw_device_do_sense(cdev, irb);
769 return;
770 }
3ba1998e 771call_handler:
1da177e4 772 cdev->private->state = DEV_STATE_ONLINE;
217ee6c6
ME		 773 /* In case sensing interfered with setting the device online */
774 wake_up(&cdev->private->wait_q);
1da177e4
LT		 775 /* Call the handler. */
776 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
777 /* Start delayed path verification. */
778 ccw_device_online_verify(cdev, 0);
779}
780
1da177e4
LT		 781static void
782ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
783{
784 struct subchannel *sch;
785
786 sch = to_subchannel(cdev->dev.parent);
787 ccw_device_set_timeout(cdev, 0);
7c8427c3
CH		 788 /* Start delayed path verification. */
789 ccw_device_online_verify(cdev, 0);
1da177e4 790 /* OK, i/o is dead now. Call interrupt handler. */
1da177e4
LT		 791 if (cdev->handler)
792 cdev->handler(cdev, cdev->private->intparm,
e7769b48 793 ERR_PTR(-EIO));
1da177e4
LT		 794}
795
796static void
797ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
798{
799 int ret;
800
801 ret = ccw_device_cancel_halt_clear(cdev);
802 if (ret == -EBUSY) {
803 ccw_device_set_timeout(cdev, 3*HZ);
804 return;
805 }
7c8427c3
CH		 806 /* Start delayed path verification. */
807 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 808 if (cdev->handler)
809 cdev->handler(cdev, cdev->private->intparm,
e7769b48 810 ERR_PTR(-EIO));
1da177e4
LT		 811}
812
c820de39 813void ccw_device_kill_io(struct ccw_device *cdev)
1da177e4
LT		 814{
815 int ret;
1da177e4 816
1da177e4
LT		 817 ret = ccw_device_cancel_halt_clear(cdev);
818 if (ret == -EBUSY) {
819 ccw_device_set_timeout(cdev, 3*HZ);
820 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
821 return;
822 }
7c8427c3
CH		 823 /* Start delayed path verification. */
824 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 825 if (cdev->handler)
826 cdev->handler(cdev, cdev->private->intparm,
e7769b48 827 ERR_PTR(-EIO));
1da177e4
LT		 828}
829
830static void
28bdc6f6 831ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1da177e4 832{
28bdc6f6 833 /* Start verification after current task finished. */
7e560814 834 cdev->private->flags.doverify = 1;
1da177e4
LT		 835}
836
1da177e4
LT		 837static void
838ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
839{
840 struct subchannel *sch;
841
842 sch = to_subchannel(cdev->dev.parent);
edf22096 843 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1da177e4
LT		 844 /* Couldn't enable the subchannel for i/o. Sick device. */
845 return;
1da177e4
LT		 846 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
847 ccw_device_sense_id_start(cdev);
848}
849
c820de39 850void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1da177e4 851{
c820de39 852 struct subchannel *sch;
1da177e4 853
1da177e4
LT		 854 if (cdev->private->state != DEV_STATE_DISCONNECTED)
855 return;
856
c820de39 857 sch = to_subchannel(cdev->dev.parent);
1da177e4 858 /* Update some values. */
cdb912a4 859 if (cio_update_schib(sch))
7674da77 860 return;
1da177e4
LT		 861 /*
862 * The pim, pam, pom values may not be accurate, but they are the best
863 * we have before performing device selection :/
864 */
28bdc6f6 865 sch->lpm = sch->schib.pmcw.pam & sch->opm;
13952ec1
SO		 866 /*
867 * Use the initial configuration since we can't be shure that the old
868 * paths are valid.
869 */
870 io_subchannel_init_config(sch);
f444cc0e
SO		 871 if (cio_commit_config(sch))
872 return;
13952ec1 873
1da177e4 874 /* We should also udate ssd info, but this has to wait. */
d7b5a4c9 875 /* Check if this is another device which appeared on the same sch. */
5d6e6b6f
PO		 876 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
877 css_schedule_eval(sch->schid);
878 else
d7b5a4c9 879 ccw_device_start_id(cdev, 0);
1da177e4
LT		 880}
881
16b9a057
PO		 882static void ccw_device_disabled_irq(struct ccw_device *cdev,
883 enum dev_event dev_event)
1da177e4
LT		 884{
885 struct subchannel *sch;
886
887 sch = to_subchannel(cdev->dev.parent);
888 /*
16b9a057 889 * An interrupt in a disabled state means a previous disable was not
ed04b892 890 * successful - should not happen, but we try to disable again.
1da177e4
LT		 891 */
892 cio_disable_subchannel(sch);
893}
894
895static void
896ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
897{
898 retry_set_schib(cdev);
899 cdev->private->state = DEV_STATE_ONLINE;
900 dev_fsm_event(cdev, dev_event);
901}
902
94bb0633
CH		 903static void ccw_device_update_cmfblock(struct ccw_device *cdev,
904 enum dev_event dev_event)
905{
906 cmf_retry_copy_block(cdev);
907 cdev->private->state = DEV_STATE_ONLINE;
908 dev_fsm_event(cdev, dev_event);
909}
1da177e4
LT		 910
911static void
912ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
913{
914 ccw_device_set_timeout(cdev, 0);
56e6b796 915 cdev->private->state = DEV_STATE_NOT_OPER;
1da177e4
LT		 916 wake_up(&cdev->private->wait_q);
917}
918
919static void
920ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
921{
922 int ret;
923
924 ret = ccw_device_cancel_halt_clear(cdev);
56e6b796
SO		 925 if (ret == -EBUSY) {
926 ccw_device_set_timeout(cdev, HZ/10);
927 } else {
1da177e4
LT		 928 cdev->private->state = DEV_STATE_NOT_OPER;
929 wake_up(&cdev->private->wait_q);
1da177e4
LT		 930 }
931}
932
933/*
934 * No operation action. This is used e.g. to ignore a timeout event in
935 * state offline.
936 */
937static void
938ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
939{
940}
941
1da177e4
LT		 942/*
943 * device statemachine
944 */
945fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
946 [DEV_STATE_NOT_OPER] = {
947 [DEV_EVENT_NOTOPER] = ccw_device_nop,
16b9a057 948 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4
LT		 949 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
950 [DEV_EVENT_VERIFY] = ccw_device_nop,
951 },
952 [DEV_STATE_SENSE_PGID] = {
9679baaf
PO		 953 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
954 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
955 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 956 [DEV_EVENT_VERIFY] = ccw_device_nop,
957 },
958 [DEV_STATE_SENSE_ID] = {
39f5360b
PO		 959 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
960 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
961 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 962 [DEV_EVENT_VERIFY] = ccw_device_nop,
963 },
964 [DEV_STATE_OFFLINE] = {
3f4cf6e7 965 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
16b9a057 966 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4 967 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1f1148c8 968 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1da177e4
LT		 969 },
970 [DEV_STATE_VERIFY] = {
9679baaf
PO		 971 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
972 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
973 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
28bdc6f6 974 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1da177e4
LT		 975 },
976 [DEV_STATE_ONLINE] = {
3f4cf6e7 977 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 978 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
979 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
980 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
981 },
982 [DEV_STATE_W4SENSE] = {
3f4cf6e7 983 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 984 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
985 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
986 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
987 },
988 [DEV_STATE_DISBAND_PGID] = {
9679baaf
PO		 989 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
990 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
991 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 992 [DEV_EVENT_VERIFY] = ccw_device_nop,
993 },
994 [DEV_STATE_BOXED] = {
3f4cf6e7 995 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
d7d12ef2
PO		 996 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
997 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
998 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1da177e4
LT		 999 },
1000 /* states to wait for i/o completion before doing something */
1da177e4 1001 [DEV_STATE_TIMEOUT_KILL] = {
3f4cf6e7 1002 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 1003 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1004 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1005 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1006 },
1da177e4
LT		 1007 [DEV_STATE_QUIESCE] = {
1008 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1009 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1010 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1011 [DEV_EVENT_VERIFY] = ccw_device_nop,
1012 },
1013 /* special states for devices gone not operational */
1014 [DEV_STATE_DISCONNECTED] = {
1015 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1016 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
16b9a057 1017 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
28bdc6f6 1018 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1da177e4
LT		 1019 },
1020 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
39f5360b
PO		 1021 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1022 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1023 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 1024 [DEV_EVENT_VERIFY] = ccw_device_nop,
1025 },
1026 [DEV_STATE_CMFCHANGE] = {
1027 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1028 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1029 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1030 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1031 },
94bb0633
CH		 1032 [DEV_STATE_CMFUPDATE] = {
1033 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1034 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1035 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1036 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1037 },
d7d12ef2
PO		 1038 [DEV_STATE_STEAL_LOCK] = {
1039 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1040 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1041 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1042 [DEV_EVENT_VERIFY] = ccw_device_nop,
1043 },
1da177e4
LT		 1044};
1045
1da177e4 1046EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
Linux kernel - Deliverables
This page took 0.609897 seconds and 5 git commands to generate.