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[S390] cio: use exception-save stsch
[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;
8821d24c 48 cc = stsch_err(sch->schid, &schib);
14ff56bb
SO		 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
76e6fb4b
SO		 316/**
317 * ccw_device_notify() - inform the device's driver about an event
318 * @cdev: device for which an event occured
319 * @event: event that occurred
320 *
321 * Returns:
322 * -%EINVAL if the device is offline or has no driver.
323 * -%EOPNOTSUPP if the device's driver has no notifier registered.
324 * %NOTIFY_OK if the driver wants to keep the device.
325 * %NOTIFY_BAD if the driver doesn't want to keep the device.
326 */
c820de39
CH		 327int ccw_device_notify(struct ccw_device *cdev, int event)
328{
76e6fb4b
SO		 329 int ret = -EINVAL;
330
c820de39 331 if (!cdev->drv)
76e6fb4b 332 goto out;
c820de39 333 if (!cdev->online)
76e6fb4b 334 goto out;
91c36919
PO		 335 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
336 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
337 event);
76e6fb4b
SO		 338 if (!cdev->drv->notify) {
339 ret = -EOPNOTSUPP;
340 goto out;
341 }
342 if (cdev->drv->notify(cdev, event))
343 ret = NOTIFY_OK;
344 else
345 ret = NOTIFY_BAD;
346out:
347 return ret;
c820de39
CH		 348}
349
91c36919
PO		 350static void ccw_device_oper_notify(struct ccw_device *cdev)
351{
76e6fb4b 352 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
94bb0633 353 /* Reenable channel measurements, if needed. */
37de53bb 354 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
91c36919
PO		 355 return;
356 }
357 /* Driver doesn't want device back. */
358 ccw_device_set_notoper(cdev);
37de53bb 359 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1da177e4
LT		 360}
361
362/*
363 * Finished with online/offline processing.
364 */
365static void
366ccw_device_done(struct ccw_device *cdev, int state)
367{
368 struct subchannel *sch;
369
370 sch = to_subchannel(cdev->dev.parent);
371
f1ee3281
CH		 372 ccw_device_set_timeout(cdev, 0);
373
1da177e4
LT		 374 if (state != DEV_STATE_ONLINE)
375 cio_disable_subchannel(sch);
376
377 /* Reset device status. */
378 memset(&cdev->private->irb, 0, sizeof(struct irb));
379
380 cdev->private->state = state;
381
9a332116
PO		 382 switch (state) {
383 case DEV_STATE_BOXED:
139b83dd
ME		 384 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
385 cdev->private->dev_id.devno, sch->schid.sch_no);
76e6fb4b
SO		 386 if (cdev->online &&
387 ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK)
37de53bb 388 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
47593bfa 389 cdev->private->flags.donotify = 0;
9a332116
PO		 390 break;
391 case DEV_STATE_NOT_OPER:
626e476a
SO		 392 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
393 cdev->private->dev_id.devno, sch->schid.sch_no);
76e6fb4b 394 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
37de53bb 395 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 396 else
397 ccw_device_set_disconnected(cdev);
626e476a 398 cdev->private->flags.donotify = 0;
9a332116
PO		 399 break;
400 case DEV_STATE_DISCONNECTED:
401 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
402 "%04x\n", cdev->private->dev_id.devno,
403 sch->schid.sch_no);
76e6fb4b 404 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
37de53bb 405 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
9a332116
PO		 406 else
407 ccw_device_set_disconnected(cdev);
408 cdev->private->flags.donotify = 0;
409 break;
410 default:
411 break;
626e476a 412 }
1da177e4
LT		 413
414 if (cdev->private->flags.donotify) {
415 cdev->private->flags.donotify = 0;
91c36919 416 ccw_device_oper_notify(cdev);
1da177e4
LT		 417 }
418 wake_up(&cdev->private->wait_q);
1da177e4
LT		 419}
420
1da177e4
LT		 421/*
422 * Start device recognition.
423 */
736b5db8 424void ccw_device_recognition(struct ccw_device *cdev)
1da177e4 425{
736b5db8 426 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1da177e4
LT		 427
428 /*
429 * We used to start here with a sense pgid to find out whether a device
430 * is locked by someone else. Unfortunately, the sense pgid command
431 * code has other meanings on devices predating the path grouping
432 * algorithm, so we start with sense id and box the device after an
433 * timeout (or if sense pgid during path verification detects the device
434 * is locked, as may happen on newer devices).
435 */
436 cdev->private->flags.recog_done = 0;
437 cdev->private->state = DEV_STATE_SENSE_ID;
736b5db8
PO		 438 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
439 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
440 return;
441 }
1da177e4 442 ccw_device_sense_id_start(cdev);
1da177e4
LT		 443}
444
445/*
39f5360b 446 * Handle events for states that use the ccw request infrastructure.
1da177e4 447 */
39f5360b 448static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
1da177e4 449{
39f5360b
PO		 450 switch (e) {
451 case DEV_EVENT_NOTOPER:
452 ccw_request_notoper(cdev);
1da177e4 453 break;
39f5360b
PO		 454 case DEV_EVENT_INTERRUPT:
455 ccw_request_handler(cdev);
456 break;
457 case DEV_EVENT_TIMEOUT:
458 ccw_request_timeout(cdev);
1da177e4
LT		 459 break;
460 default:
39f5360b 461 break;
1da177e4
LT		 462 }
463}
464
1da177e4
LT		 465void
466ccw_device_verify_done(struct ccw_device *cdev, int err)
467{
28bdc6f6
PO		 468 struct subchannel *sch;
469
470 sch = to_subchannel(cdev->dev.parent);
471 /* Update schib - pom may have changed. */
cdb912a4 472 if (cio_update_schib(sch)) {
7c4d964f
PO		 473 err = -ENODEV;
474 goto callback;
cdb912a4 475 }
28bdc6f6
PO		 476 /* Update lpm with verified path mask. */
477 sch->lpm = sch->vpm;
478 /* Repeat path verification? */
479 if (cdev->private->flags.doverify) {
28bdc6f6
PO		 480 ccw_device_verify_start(cdev);
481 return;
482 }
7c4d964f 483callback:
1da177e4 484 switch (err) {
1da177e4
LT		 485 case 0:
486 ccw_device_done(cdev, DEV_STATE_ONLINE);
487 /* Deliver fake irb to device driver, if needed. */
488 if (cdev->private->flags.fake_irb) {
489 memset(&cdev->private->irb, 0, sizeof(struct irb));
23d805b6
PO		 490 cdev->private->irb.scsw.cmd.cc = 1;
491 cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
492 cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
493 cdev->private->irb.scsw.cmd.stctl =
494 SCSW_STCTL_STATUS_PEND;
1da177e4
LT		 495 cdev->private->flags.fake_irb = 0;
496 if (cdev->handler)
497 cdev->handler(cdev, cdev->private->intparm,
498 &cdev->private->irb);
499 memset(&cdev->private->irb, 0, sizeof(struct irb));
500 }
501 break;
502 case -ETIME:
52ef0608 503 case -EUSERS:
8b42f5c2
PO		 504 /* Reset oper notify indication after verify error. */
505 cdev->private->flags.donotify = 0;
1da177e4
LT		 506 ccw_device_done(cdev, DEV_STATE_BOXED);
507 break;
7c4d964f
PO		 508 case -EACCES:
509 /* Reset oper notify indication after verify error. */
510 cdev->private->flags.donotify = 0;
511 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
512 break;
1da177e4 513 default:
8b42f5c2
PO		 514 /* Reset oper notify indication after verify error. */
515 cdev->private->flags.donotify = 0;
7c4d964f 516 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
1da177e4
LT		 517 break;
518 }
519}
520
521/*
522 * Get device online.
523 */
524int
525ccw_device_online(struct ccw_device *cdev)
526{
527 struct subchannel *sch;
528 int ret;
529
530 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
531 (cdev->private->state != DEV_STATE_BOXED))
532 return -EINVAL;
533 sch = to_subchannel(cdev->dev.parent);
edf22096 534 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1da177e4
LT		 535 if (ret != 0) {
536 /* Couldn't enable the subchannel for i/o. Sick device. */
537 if (ret == -ENODEV)
538 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
539 return ret;
540 }
52ef0608
PO		 541 /* Start initial path verification. */
542 cdev->private->state = DEV_STATE_VERIFY;
543 ccw_device_verify_start(cdev);
1da177e4
LT		 544 return 0;
545}
546
547void
548ccw_device_disband_done(struct ccw_device *cdev, int err)
549{
550 switch (err) {
551 case 0:
552 ccw_device_done(cdev, DEV_STATE_OFFLINE);
553 break;
554 case -ETIME:
555 ccw_device_done(cdev, DEV_STATE_BOXED);
556 break;
557 default:
3ecb0a5a 558 cdev->private->flags.donotify = 0;
1da177e4
LT		 559 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
560 break;
561 }
562}
563
564/*
565 * Shutdown device.
566 */
567int
568ccw_device_offline(struct ccw_device *cdev)
569{
570 struct subchannel *sch;
571
b301ea8c
PO		 572 /* Allow ccw_device_offline while disconnected. */
573 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
574 cdev->private->state == DEV_STATE_NOT_OPER) {
575 cdev->private->flags.donotify = 0;
576 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
577 return 0;
578 }
102e835d
PO		 579 if (cdev->private->state == DEV_STATE_BOXED) {
580 ccw_device_done(cdev, DEV_STATE_BOXED);
581 return 0;
582 }
d7b5a4c9
CH		 583 if (ccw_device_is_orphan(cdev)) {
584 ccw_device_done(cdev, DEV_STATE_OFFLINE);
585 return 0;
586 }
1da177e4 587 sch = to_subchannel(cdev->dev.parent);
cdb912a4 588 if (cio_update_schib(sch))
1da177e4 589 return -ENODEV;
23d805b6 590 if (scsw_actl(&sch->schib.scsw) != 0)
1da177e4 591 return -EBUSY;
23d805b6
PO		 592 if (cdev->private->state != DEV_STATE_ONLINE)
593 return -EINVAL;
1da177e4 594 /* Are we doing path grouping? */
454e1fa1 595 if (!cdev->private->flags.pgroup) {
1da177e4
LT		 596 /* No, set state offline immediately. */
597 ccw_device_done(cdev, DEV_STATE_OFFLINE);
598 return 0;
599 }
600 /* Start Set Path Group commands. */
601 cdev->private->state = DEV_STATE_DISBAND_PGID;
602 ccw_device_disband_start(cdev);
603 return 0;
604}
605
1da177e4 606/*
3f4cf6e7 607 * Handle not operational event in non-special state.
1da177e4 608 */
3f4cf6e7
CH		 609static void ccw_device_generic_notoper(struct ccw_device *cdev,
610 enum dev_event dev_event)
1da177e4 611{
76e6fb4b 612 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
37de53bb 613 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 614 else
615 ccw_device_set_disconnected(cdev);
1da177e4
LT		 616}
617
1f1148c8
PO		 618/*
619 * Handle path verification event in offline state.
620 */
621static void ccw_device_offline_verify(struct ccw_device *cdev,
622 enum dev_event dev_event)
623{
624 struct subchannel *sch = to_subchannel(cdev->dev.parent);
625
626 css_schedule_eval(sch->schid);
627}
628
1da177e4
LT		 629/*
630 * Handle path verification event.
631 */
632static void
633ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
634{
635 struct subchannel *sch;
636
1da177e4
LT		 637 if (cdev->private->state == DEV_STATE_W4SENSE) {
638 cdev->private->flags.doverify = 1;
639 return;
640 }
641 sch = to_subchannel(cdev->dev.parent);
642 /*
643 * Since we might not just be coming from an interrupt from the
644 * subchannel we have to update the schib.
645 */
cdb912a4
SO		 646 if (cio_update_schib(sch)) {
647 ccw_device_verify_done(cdev, -ENODEV);
648 return;
649 }
1da177e4 650
23d805b6
PO		 651 if (scsw_actl(&sch->schib.scsw) != 0 ||
652 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
653 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
1da177e4
LT		 654 /*
655 * No final status yet or final status not yet delivered
656 * to the device driver. Can't do path verfication now,
657 * delay until final status was delivered.
658 */
659 cdev->private->flags.doverify = 1;
660 return;
661 }
662 /* Device is idle, we can do the path verification. */
663 cdev->private->state = DEV_STATE_VERIFY;
664 ccw_device_verify_start(cdev);
665}
666
d7d12ef2
PO		 667/*
668 * Handle path verification event in boxed state.
669 */
670static void ccw_device_boxed_verify(struct ccw_device *cdev,
671 enum dev_event dev_event)
672{
673 struct subchannel *sch = to_subchannel(cdev->dev.parent);
674
675 if (cdev->online) {
676 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
677 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
678 else
679 ccw_device_online_verify(cdev, dev_event);
680 } else
681 css_schedule_eval(sch->schid);
682}
683
1da177e4
LT		 684/*
685 * Got an interrupt for a normal io (state online).
686 */
687static void
688ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
689{
690 struct irb *irb;
83262d63 691 int is_cmd;
1da177e4 692
cbb870c8 693 irb = (struct irb *)&S390_lowcore.irb;
83262d63 694 is_cmd = !scsw_is_tm(&irb->scsw);
1da177e4 695 /* Check for unsolicited interrupt. */
23d805b6 696 if (!scsw_is_solicited(&irb->scsw)) {
83262d63 697 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1da177e4
LT		 698 !irb->esw.esw0.erw.cons) {
699 /* Unit check but no sense data. Need basic sense. */
700 if (ccw_device_do_sense(cdev, irb) != 0)
701 goto call_handler_unsol;
e0ec5749 702 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 703 cdev->private->state = DEV_STATE_W4SENSE;
704 cdev->private->intparm = 0;
705 return;
706 }
707call_handler_unsol:
708 if (cdev->handler)
709 cdev->handler (cdev, 0, irb);
18374d37
CH		 710 if (cdev->private->flags.doverify)
711 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 712 return;
713 }
714 /* Accumulate status and find out if a basic sense is needed. */
715 ccw_device_accumulate_irb(cdev, irb);
83262d63 716 if (is_cmd && cdev->private->flags.dosense) {
1da177e4
LT		 717 if (ccw_device_do_sense(cdev, irb) == 0) {
718 cdev->private->state = DEV_STATE_W4SENSE;
719 }
720 return;
721 }
722 /* Call the handler. */
723 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
724 /* Start delayed path verification. */
725 ccw_device_online_verify(cdev, 0);
726}
727
728/*
729 * Got an timeout in online state.
730 */
731static void
732ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
733{
734 int ret;
735
736 ccw_device_set_timeout(cdev, 0);
737 ret = ccw_device_cancel_halt_clear(cdev);
738 if (ret == -EBUSY) {
739 ccw_device_set_timeout(cdev, 3*HZ);
740 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
741 return;
742 }
3f4cf6e7
CH		 743 if (ret == -ENODEV)
744 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
745 else if (cdev->handler)
1da177e4
LT		 746 cdev->handler(cdev, cdev->private->intparm,
747 ERR_PTR(-ETIMEDOUT));
748}
749
750/*
751 * Got an interrupt for a basic sense.
752 */
2b67fc46 753static void
1da177e4
LT		 754ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
755{
756 struct irb *irb;
757
cbb870c8 758 irb = (struct irb *)&S390_lowcore.irb;
1da177e4 759 /* Check for unsolicited interrupt. */
23d805b6
PO		 760 if (scsw_stctl(&irb->scsw) ==
761 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
762 if (scsw_cc(&irb->scsw) == 1)
1da177e4
LT		 763 /* Basic sense hasn't started. Try again. */
764 ccw_device_do_sense(cdev, irb);
765 else {
139b83dd 766 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
e556bbbd
CH		 767 "interrupt during w4sense...\n",
768 cdev->private->dev_id.ssid,
769 cdev->private->dev_id.devno);
1da177e4
LT		 770 if (cdev->handler)
771 cdev->handler (cdev, 0, irb);
772 }
773 return;
774 }
3ba1998e
CH		 775 /*
776 * Check if a halt or clear has been issued in the meanwhile. If yes,
777 * only deliver the halt/clear interrupt to the device driver as if it
778 * had killed the original request.
779 */
23d805b6
PO		 780 if (scsw_fctl(&irb->scsw) &
781 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
3ba1998e
CH		 782 cdev->private->flags.dosense = 0;
783 memset(&cdev->private->irb, 0, sizeof(struct irb));
784 ccw_device_accumulate_irb(cdev, irb);
785 goto call_handler;
786 }
1da177e4
LT		 787 /* Add basic sense info to irb. */
788 ccw_device_accumulate_basic_sense(cdev, irb);
789 if (cdev->private->flags.dosense) {
790 /* Another basic sense is needed. */
791 ccw_device_do_sense(cdev, irb);
792 return;
793 }
3ba1998e 794call_handler:
1da177e4 795 cdev->private->state = DEV_STATE_ONLINE;
217ee6c6
ME		 796 /* In case sensing interfered with setting the device online */
797 wake_up(&cdev->private->wait_q);
1da177e4
LT		 798 /* Call the handler. */
799 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
800 /* Start delayed path verification. */
801 ccw_device_online_verify(cdev, 0);
802}
803
1da177e4
LT		 804static void
805ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
806{
807 struct subchannel *sch;
808
809 sch = to_subchannel(cdev->dev.parent);
810 ccw_device_set_timeout(cdev, 0);
7c8427c3
CH		 811 /* Start delayed path verification. */
812 ccw_device_online_verify(cdev, 0);
1da177e4 813 /* OK, i/o is dead now. Call interrupt handler. */
1da177e4
LT		 814 if (cdev->handler)
815 cdev->handler(cdev, cdev->private->intparm,
e7769b48 816 ERR_PTR(-EIO));
1da177e4
LT		 817}
818
819static void
820ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
821{
822 int ret;
823
824 ret = ccw_device_cancel_halt_clear(cdev);
825 if (ret == -EBUSY) {
826 ccw_device_set_timeout(cdev, 3*HZ);
827 return;
828 }
7c8427c3
CH		 829 /* Start delayed path verification. */
830 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 831 if (cdev->handler)
832 cdev->handler(cdev, cdev->private->intparm,
e7769b48 833 ERR_PTR(-EIO));
1da177e4
LT		 834}
835
c820de39 836void ccw_device_kill_io(struct ccw_device *cdev)
1da177e4
LT		 837{
838 int ret;
1da177e4 839
1da177e4
LT		 840 ret = ccw_device_cancel_halt_clear(cdev);
841 if (ret == -EBUSY) {
842 ccw_device_set_timeout(cdev, 3*HZ);
843 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
844 return;
845 }
7c8427c3
CH		 846 /* Start delayed path verification. */
847 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 848 if (cdev->handler)
849 cdev->handler(cdev, cdev->private->intparm,
e7769b48 850 ERR_PTR(-EIO));
1da177e4
LT		 851}
852
853static void
28bdc6f6 854ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1da177e4 855{
28bdc6f6 856 /* Start verification after current task finished. */
7e560814 857 cdev->private->flags.doverify = 1;
1da177e4
LT		 858}
859
1da177e4
LT		 860static void
861ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
862{
863 struct subchannel *sch;
864
865 sch = to_subchannel(cdev->dev.parent);
edf22096 866 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1da177e4
LT		 867 /* Couldn't enable the subchannel for i/o. Sick device. */
868 return;
1da177e4
LT		 869 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
870 ccw_device_sense_id_start(cdev);
871}
872
c820de39 873void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1da177e4 874{
c820de39 875 struct subchannel *sch;
1da177e4 876
1da177e4
LT		 877 if (cdev->private->state != DEV_STATE_DISCONNECTED)
878 return;
879
c820de39 880 sch = to_subchannel(cdev->dev.parent);
1da177e4 881 /* Update some values. */
cdb912a4 882 if (cio_update_schib(sch))
7674da77 883 return;
1da177e4
LT		 884 /*
885 * The pim, pam, pom values may not be accurate, but they are the best
886 * we have before performing device selection :/
887 */
28bdc6f6 888 sch->lpm = sch->schib.pmcw.pam & sch->opm;
13952ec1
SO		 889 /*
890 * Use the initial configuration since we can't be shure that the old
891 * paths are valid.
892 */
893 io_subchannel_init_config(sch);
f444cc0e
SO		 894 if (cio_commit_config(sch))
895 return;
13952ec1 896
1da177e4 897 /* We should also udate ssd info, but this has to wait. */
d7b5a4c9 898 /* Check if this is another device which appeared on the same sch. */
5d6e6b6f
PO		 899 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
900 css_schedule_eval(sch->schid);
901 else
d7b5a4c9 902 ccw_device_start_id(cdev, 0);
1da177e4
LT		 903}
904
16b9a057
PO		 905static void ccw_device_disabled_irq(struct ccw_device *cdev,
906 enum dev_event dev_event)
1da177e4
LT		 907{
908 struct subchannel *sch;
909
910 sch = to_subchannel(cdev->dev.parent);
911 /*
16b9a057 912 * An interrupt in a disabled state means a previous disable was not
ed04b892 913 * successful - should not happen, but we try to disable again.
1da177e4
LT		 914 */
915 cio_disable_subchannel(sch);
916}
917
918static void
919ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
920{
921 retry_set_schib(cdev);
922 cdev->private->state = DEV_STATE_ONLINE;
923 dev_fsm_event(cdev, dev_event);
924}
925
94bb0633
CH		 926static void ccw_device_update_cmfblock(struct ccw_device *cdev,
927 enum dev_event dev_event)
928{
929 cmf_retry_copy_block(cdev);
930 cdev->private->state = DEV_STATE_ONLINE;
931 dev_fsm_event(cdev, dev_event);
932}
1da177e4
LT		 933
934static void
935ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
936{
937 ccw_device_set_timeout(cdev, 0);
56e6b796 938 cdev->private->state = DEV_STATE_NOT_OPER;
1da177e4
LT		 939 wake_up(&cdev->private->wait_q);
940}
941
942static void
943ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
944{
945 int ret;
946
947 ret = ccw_device_cancel_halt_clear(cdev);
56e6b796
SO		 948 if (ret == -EBUSY) {
949 ccw_device_set_timeout(cdev, HZ/10);
950 } else {
1da177e4
LT		 951 cdev->private->state = DEV_STATE_NOT_OPER;
952 wake_up(&cdev->private->wait_q);
1da177e4
LT		 953 }
954}
955
956/*
957 * No operation action. This is used e.g. to ignore a timeout event in
958 * state offline.
959 */
960static void
961ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
962{
963}
964
1da177e4
LT		 965/*
966 * device statemachine
967 */
968fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
969 [DEV_STATE_NOT_OPER] = {
970 [DEV_EVENT_NOTOPER] = ccw_device_nop,
16b9a057 971 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4
LT		 972 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
973 [DEV_EVENT_VERIFY] = ccw_device_nop,
974 },
975 [DEV_STATE_SENSE_PGID] = {
9679baaf
PO		 976 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
977 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
978 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 979 [DEV_EVENT_VERIFY] = ccw_device_nop,
980 },
981 [DEV_STATE_SENSE_ID] = {
39f5360b
PO		 982 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
983 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
984 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 985 [DEV_EVENT_VERIFY] = ccw_device_nop,
986 },
987 [DEV_STATE_OFFLINE] = {
3f4cf6e7 988 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
16b9a057 989 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4 990 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1f1148c8 991 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1da177e4
LT		 992 },
993 [DEV_STATE_VERIFY] = {
9679baaf
PO		 994 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
995 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
996 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
28bdc6f6 997 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1da177e4
LT		 998 },
999 [DEV_STATE_ONLINE] = {
3f4cf6e7 1000 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 1001 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1002 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1003 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1004 },
1005 [DEV_STATE_W4SENSE] = {
3f4cf6e7 1006 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 1007 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1008 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1009 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1010 },
1011 [DEV_STATE_DISBAND_PGID] = {
9679baaf
PO		 1012 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1013 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1014 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 1015 [DEV_EVENT_VERIFY] = ccw_device_nop,
1016 },
1017 [DEV_STATE_BOXED] = {
3f4cf6e7 1018 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
d7d12ef2
PO		 1019 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
1020 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1021 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1da177e4
LT		 1022 },
1023 /* states to wait for i/o completion before doing something */
1da177e4 1024 [DEV_STATE_TIMEOUT_KILL] = {
3f4cf6e7 1025 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 1026 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1027 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1028 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1029 },
1da177e4
LT		 1030 [DEV_STATE_QUIESCE] = {
1031 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1032 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1033 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1034 [DEV_EVENT_VERIFY] = ccw_device_nop,
1035 },
1036 /* special states for devices gone not operational */
1037 [DEV_STATE_DISCONNECTED] = {
1038 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1039 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
16b9a057 1040 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
28bdc6f6 1041 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1da177e4
LT		 1042 },
1043 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
39f5360b
PO		 1044 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1045 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1046 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 1047 [DEV_EVENT_VERIFY] = ccw_device_nop,
1048 },
1049 [DEV_STATE_CMFCHANGE] = {
1050 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1051 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1052 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1053 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1054 },
94bb0633
CH		 1055 [DEV_STATE_CMFUPDATE] = {
1056 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1057 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1058 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1059 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1060 },
d7d12ef2
PO		 1061 [DEV_STATE_STEAL_LOCK] = {
1062 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1063 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1064 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1065 [DEV_EVENT_VERIFY] = ccw_device_nop,
1066 },
1da177e4
LT		 1067};
1068
1da177e4 1069EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
Linux kernel - Deliverables
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