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[S390] cio: add per device initialization status flag
[mirror_ubuntu-artful-kernel.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
1da177e4
LT		 232 cio_disable_subchannel(sch);
233 /*
234 * Now that we tried recognition, we have performed device selection
235 * through ssch() and the path information is up to date.
236 */
237 old_lpm = sch->lpm;
cdb912a4 238
4ffa9234 239 /* Check since device may again have become not operational. */
cdb912a4 240 if (cio_update_schib(sch))
4ffa9234 241 state = DEV_STATE_NOT_OPER;
cdb912a4
SO		 242 else
243 sch->lpm = sch->schib.pmcw.pam & sch->opm;
244
1da177e4
LT		 245 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
246 /* Force reprobe on all chpids. */
247 old_lpm = 0;
248 if (sch->lpm != old_lpm)
249 __recover_lost_chpids(sch, old_lpm);
47593bfa
SO		 250 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
251 (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
252 cdev->private->flags.recog_done = 1;
253 cdev->private->state = DEV_STATE_DISCONNECTED;
254 wake_up(&cdev->private->wait_q);
255 return;
1da177e4 256 }
823d494a
SO		 257 if (cdev->private->flags.resuming) {
258 cdev->private->state = state;
259 cdev->private->flags.recog_done = 1;
260 wake_up(&cdev->private->wait_q);
261 return;
262 }
1da177e4
LT		 263 switch (state) {
264 case DEV_STATE_NOT_OPER:
1da177e4
LT		 265 break;
266 case DEV_STATE_OFFLINE:
823d494a
SO		 267 if (!cdev->online) {
268 ccw_device_update_sense_data(cdev);
823d494a 269 break;
1da177e4 270 }
823d494a
SO		 271 cdev->private->state = DEV_STATE_OFFLINE;
272 cdev->private->flags.recog_done = 1;
273 if (ccw_device_test_sense_data(cdev)) {
274 cdev->private->flags.donotify = 1;
275 ccw_device_online(cdev);
276 wake_up(&cdev->private->wait_q);
277 } else {
278 ccw_device_update_sense_data(cdev);
37de53bb 279 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1da177e4 280 }
823d494a 281 return;
1da177e4 282 case DEV_STATE_BOXED:
47593bfa
SO		 283 if (cdev->id.cu_type != 0) { /* device was recognized before */
284 cdev->private->flags.recog_done = 1;
285 cdev->private->state = DEV_STATE_BOXED;
286 wake_up(&cdev->private->wait_q);
287 return;
288 }
1da177e4
LT		 289 break;
290 }
291 cdev->private->state = state;
292 io_subchannel_recog_done(cdev);
156013ff 293 wake_up(&cdev->private->wait_q);
1da177e4
LT		 294}
295
296/*
297 * Function called from device_id.c after sense id has completed.
298 */
299void
300ccw_device_sense_id_done(struct ccw_device *cdev, int err)
301{
302 switch (err) {
303 case 0:
304 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
305 break;
306 case -ETIME: /* Sense id stopped by timeout. */
307 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
308 break;
309 default:
310 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
311 break;
312 }
313}
314
c820de39
CH		 315int ccw_device_notify(struct ccw_device *cdev, int event)
316{
317 if (!cdev->drv)
318 return 0;
319 if (!cdev->online)
320 return 0;
91c36919
PO		 321 CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
322 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
323 event);
c820de39
CH		 324 return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
325}
326
91c36919
PO		 327static void ccw_device_oper_notify(struct ccw_device *cdev)
328{
329 if (ccw_device_notify(cdev, CIO_OPER)) {
94bb0633 330 /* Reenable channel measurements, if needed. */
37de53bb 331 ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
91c36919
PO		 332 return;
333 }
334 /* Driver doesn't want device back. */
335 ccw_device_set_notoper(cdev);
37de53bb 336 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1da177e4
LT		 337}
338
339/*
340 * Finished with online/offline processing.
341 */
342static void
343ccw_device_done(struct ccw_device *cdev, int state)
344{
345 struct subchannel *sch;
346
347 sch = to_subchannel(cdev->dev.parent);
348
f1ee3281
CH		 349 ccw_device_set_timeout(cdev, 0);
350
1da177e4
LT		 351 if (state != DEV_STATE_ONLINE)
352 cio_disable_subchannel(sch);
353
354 /* Reset device status. */
355 memset(&cdev->private->irb, 0, sizeof(struct irb));
356
357 cdev->private->state = state;
358
9a332116
PO		 359 switch (state) {
360 case DEV_STATE_BOXED:
139b83dd
ME		 361 CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
362 cdev->private->dev_id.devno, sch->schid.sch_no);
47593bfa 363 if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED))
37de53bb 364 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
47593bfa 365 cdev->private->flags.donotify = 0;
9a332116
PO		 366 break;
367 case DEV_STATE_NOT_OPER:
626e476a
SO		 368 CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
369 cdev->private->dev_id.devno, sch->schid.sch_no);
370 if (!ccw_device_notify(cdev, CIO_GONE))
37de53bb 371 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 372 else
373 ccw_device_set_disconnected(cdev);
626e476a 374 cdev->private->flags.donotify = 0;
9a332116
PO		 375 break;
376 case DEV_STATE_DISCONNECTED:
377 CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel "
378 "%04x\n", cdev->private->dev_id.devno,
379 sch->schid.sch_no);
380 if (!ccw_device_notify(cdev, CIO_NO_PATH))
37de53bb 381 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
9a332116
PO		 382 else
383 ccw_device_set_disconnected(cdev);
384 cdev->private->flags.donotify = 0;
385 break;
386 default:
387 break;
626e476a 388 }
1da177e4
LT		 389
390 if (cdev->private->flags.donotify) {
391 cdev->private->flags.donotify = 0;
91c36919 392 ccw_device_oper_notify(cdev);
1da177e4
LT		 393 }
394 wake_up(&cdev->private->wait_q);
1da177e4
LT		 395}
396
1da177e4
LT		 397/*
398 * Start device recognition.
399 */
736b5db8 400void ccw_device_recognition(struct ccw_device *cdev)
1da177e4 401{
736b5db8 402 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1da177e4
LT		 403
404 /*
405 * We used to start here with a sense pgid to find out whether a device
406 * is locked by someone else. Unfortunately, the sense pgid command
407 * code has other meanings on devices predating the path grouping
408 * algorithm, so we start with sense id and box the device after an
409 * timeout (or if sense pgid during path verification detects the device
410 * is locked, as may happen on newer devices).
411 */
412 cdev->private->flags.recog_done = 0;
413 cdev->private->state = DEV_STATE_SENSE_ID;
736b5db8
PO		 414 if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
415 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
416 return;
417 }
1da177e4 418 ccw_device_sense_id_start(cdev);
1da177e4
LT		 419}
420
421/*
39f5360b 422 * Handle events for states that use the ccw request infrastructure.
1da177e4 423 */
39f5360b 424static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
1da177e4 425{
39f5360b
PO		 426 switch (e) {
427 case DEV_EVENT_NOTOPER:
428 ccw_request_notoper(cdev);
1da177e4 429 break;
39f5360b
PO		 430 case DEV_EVENT_INTERRUPT:
431 ccw_request_handler(cdev);
432 break;
433 case DEV_EVENT_TIMEOUT:
434 ccw_request_timeout(cdev);
1da177e4
LT		 435 break;
436 default:
39f5360b 437 break;
1da177e4
LT		 438 }
439}
440
1da177e4
LT		 441void
442ccw_device_verify_done(struct ccw_device *cdev, int err)
443{
28bdc6f6
PO		 444 struct subchannel *sch;
445
446 sch = to_subchannel(cdev->dev.parent);
447 /* Update schib - pom may have changed. */
cdb912a4 448 if (cio_update_schib(sch)) {
7c4d964f
PO		 449 err = -ENODEV;
450 goto callback;
cdb912a4 451 }
28bdc6f6
PO		 452 /* Update lpm with verified path mask. */
453 sch->lpm = sch->vpm;
454 /* Repeat path verification? */
455 if (cdev->private->flags.doverify) {
28bdc6f6
PO		 456 ccw_device_verify_start(cdev);
457 return;
458 }
7c4d964f 459callback:
1da177e4 460 switch (err) {
1da177e4
LT		 461 case 0:
462 ccw_device_done(cdev, DEV_STATE_ONLINE);
463 /* Deliver fake irb to device driver, if needed. */
464 if (cdev->private->flags.fake_irb) {
465 memset(&cdev->private->irb, 0, sizeof(struct irb));
23d805b6
PO		 466 cdev->private->irb.scsw.cmd.cc = 1;
467 cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
468 cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
469 cdev->private->irb.scsw.cmd.stctl =
470 SCSW_STCTL_STATUS_PEND;
1da177e4
LT		 471 cdev->private->flags.fake_irb = 0;
472 if (cdev->handler)
473 cdev->handler(cdev, cdev->private->intparm,
474 &cdev->private->irb);
475 memset(&cdev->private->irb, 0, sizeof(struct irb));
476 }
477 break;
478 case -ETIME:
52ef0608 479 case -EUSERS:
8b42f5c2
PO		 480 /* Reset oper notify indication after verify error. */
481 cdev->private->flags.donotify = 0;
1da177e4
LT		 482 ccw_device_done(cdev, DEV_STATE_BOXED);
483 break;
7c4d964f
PO		 484 case -EACCES:
485 /* Reset oper notify indication after verify error. */
486 cdev->private->flags.donotify = 0;
487 ccw_device_done(cdev, DEV_STATE_DISCONNECTED);
488 break;
1da177e4 489 default:
8b42f5c2
PO		 490 /* Reset oper notify indication after verify error. */
491 cdev->private->flags.donotify = 0;
7c4d964f 492 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
1da177e4
LT		 493 break;
494 }
495}
496
497/*
498 * Get device online.
499 */
500int
501ccw_device_online(struct ccw_device *cdev)
502{
503 struct subchannel *sch;
504 int ret;
505
506 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
507 (cdev->private->state != DEV_STATE_BOXED))
508 return -EINVAL;
509 sch = to_subchannel(cdev->dev.parent);
edf22096 510 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1da177e4
LT		 511 if (ret != 0) {
512 /* Couldn't enable the subchannel for i/o. Sick device. */
513 if (ret == -ENODEV)
514 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
515 return ret;
516 }
52ef0608
PO		 517 /* Start initial path verification. */
518 cdev->private->state = DEV_STATE_VERIFY;
519 ccw_device_verify_start(cdev);
1da177e4
LT		 520 return 0;
521}
522
523void
524ccw_device_disband_done(struct ccw_device *cdev, int err)
525{
526 switch (err) {
527 case 0:
528 ccw_device_done(cdev, DEV_STATE_OFFLINE);
529 break;
530 case -ETIME:
531 ccw_device_done(cdev, DEV_STATE_BOXED);
532 break;
533 default:
3ecb0a5a 534 cdev->private->flags.donotify = 0;
1da177e4
LT		 535 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
536 break;
537 }
538}
539
540/*
541 * Shutdown device.
542 */
543int
544ccw_device_offline(struct ccw_device *cdev)
545{
546 struct subchannel *sch;
547
b301ea8c
PO		 548 /* Allow ccw_device_offline while disconnected. */
549 if (cdev->private->state == DEV_STATE_DISCONNECTED ||
550 cdev->private->state == DEV_STATE_NOT_OPER) {
551 cdev->private->flags.donotify = 0;
552 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
553 return 0;
554 }
102e835d
PO		 555 if (cdev->private->state == DEV_STATE_BOXED) {
556 ccw_device_done(cdev, DEV_STATE_BOXED);
557 return 0;
558 }
d7b5a4c9
CH		 559 if (ccw_device_is_orphan(cdev)) {
560 ccw_device_done(cdev, DEV_STATE_OFFLINE);
561 return 0;
562 }
1da177e4 563 sch = to_subchannel(cdev->dev.parent);
cdb912a4 564 if (cio_update_schib(sch))
1da177e4 565 return -ENODEV;
23d805b6 566 if (scsw_actl(&sch->schib.scsw) != 0)
1da177e4 567 return -EBUSY;
23d805b6
PO		 568 if (cdev->private->state != DEV_STATE_ONLINE)
569 return -EINVAL;
1da177e4 570 /* Are we doing path grouping? */
454e1fa1 571 if (!cdev->private->flags.pgroup) {
1da177e4
LT		 572 /* No, set state offline immediately. */
573 ccw_device_done(cdev, DEV_STATE_OFFLINE);
574 return 0;
575 }
576 /* Start Set Path Group commands. */
577 cdev->private->state = DEV_STATE_DISBAND_PGID;
578 ccw_device_disband_start(cdev);
579 return 0;
580}
581
1da177e4 582/*
3f4cf6e7 583 * Handle not operational event in non-special state.
1da177e4 584 */
3f4cf6e7
CH		 585static void ccw_device_generic_notoper(struct ccw_device *cdev,
586 enum dev_event dev_event)
1da177e4 587{
6afcc775 588 if (!ccw_device_notify(cdev, CIO_GONE))
37de53bb 589 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
6afcc775
PO		 590 else
591 ccw_device_set_disconnected(cdev);
1da177e4
LT		 592}
593
1f1148c8
PO		 594/*
595 * Handle path verification event in offline state.
596 */
597static void ccw_device_offline_verify(struct ccw_device *cdev,
598 enum dev_event dev_event)
599{
600 struct subchannel *sch = to_subchannel(cdev->dev.parent);
601
602 css_schedule_eval(sch->schid);
603}
604
1da177e4
LT		 605/*
606 * Handle path verification event.
607 */
608static void
609ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
610{
611 struct subchannel *sch;
612
1da177e4
LT		 613 if (cdev->private->state == DEV_STATE_W4SENSE) {
614 cdev->private->flags.doverify = 1;
615 return;
616 }
617 sch = to_subchannel(cdev->dev.parent);
618 /*
619 * Since we might not just be coming from an interrupt from the
620 * subchannel we have to update the schib.
621 */
cdb912a4
SO		 622 if (cio_update_schib(sch)) {
623 ccw_device_verify_done(cdev, -ENODEV);
624 return;
625 }
1da177e4 626
23d805b6
PO		 627 if (scsw_actl(&sch->schib.scsw) != 0 ||
628 (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
629 (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
1da177e4
LT		 630 /*
631 * No final status yet or final status not yet delivered
632 * to the device driver. Can't do path verfication now,
633 * delay until final status was delivered.
634 */
635 cdev->private->flags.doverify = 1;
636 return;
637 }
638 /* Device is idle, we can do the path verification. */
639 cdev->private->state = DEV_STATE_VERIFY;
640 ccw_device_verify_start(cdev);
641}
642
d7d12ef2
PO		 643/*
644 * Handle path verification event in boxed state.
645 */
646static void ccw_device_boxed_verify(struct ccw_device *cdev,
647 enum dev_event dev_event)
648{
649 struct subchannel *sch = to_subchannel(cdev->dev.parent);
650
651 if (cdev->online) {
652 if (cio_enable_subchannel(sch, (u32) (addr_t) sch))
653 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
654 else
655 ccw_device_online_verify(cdev, dev_event);
656 } else
657 css_schedule_eval(sch->schid);
658}
659
1da177e4
LT		 660/*
661 * Got an interrupt for a normal io (state online).
662 */
663static void
664ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
665{
666 struct irb *irb;
83262d63 667 int is_cmd;
1da177e4
LT		 668
669 irb = (struct irb *) __LC_IRB;
83262d63 670 is_cmd = !scsw_is_tm(&irb->scsw);
1da177e4 671 /* Check for unsolicited interrupt. */
23d805b6 672 if (!scsw_is_solicited(&irb->scsw)) {
83262d63 673 if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1da177e4
LT		 674 !irb->esw.esw0.erw.cons) {
675 /* Unit check but no sense data. Need basic sense. */
676 if (ccw_device_do_sense(cdev, irb) != 0)
677 goto call_handler_unsol;
e0ec5749 678 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
1da177e4
LT		 679 cdev->private->state = DEV_STATE_W4SENSE;
680 cdev->private->intparm = 0;
681 return;
682 }
683call_handler_unsol:
684 if (cdev->handler)
685 cdev->handler (cdev, 0, irb);
18374d37
CH		 686 if (cdev->private->flags.doverify)
687 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 688 return;
689 }
690 /* Accumulate status and find out if a basic sense is needed. */
691 ccw_device_accumulate_irb(cdev, irb);
83262d63 692 if (is_cmd && cdev->private->flags.dosense) {
1da177e4
LT		 693 if (ccw_device_do_sense(cdev, irb) == 0) {
694 cdev->private->state = DEV_STATE_W4SENSE;
695 }
696 return;
697 }
698 /* Call the handler. */
699 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
700 /* Start delayed path verification. */
701 ccw_device_online_verify(cdev, 0);
702}
703
704/*
705 * Got an timeout in online state.
706 */
707static void
708ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
709{
710 int ret;
711
712 ccw_device_set_timeout(cdev, 0);
713 ret = ccw_device_cancel_halt_clear(cdev);
714 if (ret == -EBUSY) {
715 ccw_device_set_timeout(cdev, 3*HZ);
716 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
717 return;
718 }
3f4cf6e7
CH		 719 if (ret == -ENODEV)
720 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
721 else if (cdev->handler)
1da177e4
LT		 722 cdev->handler(cdev, cdev->private->intparm,
723 ERR_PTR(-ETIMEDOUT));
724}
725
726/*
727 * Got an interrupt for a basic sense.
728 */
2b67fc46 729static void
1da177e4
LT		 730ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
731{
732 struct irb *irb;
733
734 irb = (struct irb *) __LC_IRB;
735 /* Check for unsolicited interrupt. */
23d805b6
PO		 736 if (scsw_stctl(&irb->scsw) ==
737 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
738 if (scsw_cc(&irb->scsw) == 1)
1da177e4
LT		 739 /* Basic sense hasn't started. Try again. */
740 ccw_device_do_sense(cdev, irb);
741 else {
139b83dd 742 CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
e556bbbd
CH		 743 "interrupt during w4sense...\n",
744 cdev->private->dev_id.ssid,
745 cdev->private->dev_id.devno);
1da177e4
LT		 746 if (cdev->handler)
747 cdev->handler (cdev, 0, irb);
748 }
749 return;
750 }
3ba1998e
CH		 751 /*
752 * Check if a halt or clear has been issued in the meanwhile. If yes,
753 * only deliver the halt/clear interrupt to the device driver as if it
754 * had killed the original request.
755 */
23d805b6
PO		 756 if (scsw_fctl(&irb->scsw) &
757 (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
3ba1998e
CH		 758 cdev->private->flags.dosense = 0;
759 memset(&cdev->private->irb, 0, sizeof(struct irb));
760 ccw_device_accumulate_irb(cdev, irb);
761 goto call_handler;
762 }
1da177e4
LT		 763 /* Add basic sense info to irb. */
764 ccw_device_accumulate_basic_sense(cdev, irb);
765 if (cdev->private->flags.dosense) {
766 /* Another basic sense is needed. */
767 ccw_device_do_sense(cdev, irb);
768 return;
769 }
3ba1998e 770call_handler:
1da177e4 771 cdev->private->state = DEV_STATE_ONLINE;
217ee6c6
ME		 772 /* In case sensing interfered with setting the device online */
773 wake_up(&cdev->private->wait_q);
1da177e4
LT		 774 /* Call the handler. */
775 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
776 /* Start delayed path verification. */
777 ccw_device_online_verify(cdev, 0);
778}
779
1da177e4
LT		 780static void
781ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
782{
783 struct subchannel *sch;
784
785 sch = to_subchannel(cdev->dev.parent);
786 ccw_device_set_timeout(cdev, 0);
7c8427c3
CH		 787 /* Start delayed path verification. */
788 ccw_device_online_verify(cdev, 0);
1da177e4 789 /* OK, i/o is dead now. Call interrupt handler. */
1da177e4
LT		 790 if (cdev->handler)
791 cdev->handler(cdev, cdev->private->intparm,
e7769b48 792 ERR_PTR(-EIO));
1da177e4
LT		 793}
794
795static void
796ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
797{
798 int ret;
799
800 ret = ccw_device_cancel_halt_clear(cdev);
801 if (ret == -EBUSY) {
802 ccw_device_set_timeout(cdev, 3*HZ);
803 return;
804 }
7c8427c3
CH		 805 /* Start delayed path verification. */
806 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 807 if (cdev->handler)
808 cdev->handler(cdev, cdev->private->intparm,
e7769b48 809 ERR_PTR(-EIO));
1da177e4
LT		 810}
811
c820de39 812void ccw_device_kill_io(struct ccw_device *cdev)
1da177e4
LT		 813{
814 int ret;
1da177e4 815
1da177e4
LT		 816 ret = ccw_device_cancel_halt_clear(cdev);
817 if (ret == -EBUSY) {
818 ccw_device_set_timeout(cdev, 3*HZ);
819 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
820 return;
821 }
7c8427c3
CH		 822 /* Start delayed path verification. */
823 ccw_device_online_verify(cdev, 0);
1da177e4
LT		 824 if (cdev->handler)
825 cdev->handler(cdev, cdev->private->intparm,
e7769b48 826 ERR_PTR(-EIO));
1da177e4
LT		 827}
828
829static void
28bdc6f6 830ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1da177e4 831{
28bdc6f6 832 /* Start verification after current task finished. */
7e560814 833 cdev->private->flags.doverify = 1;
1da177e4
LT		 834}
835
1da177e4
LT		 836static void
837ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
838{
839 struct subchannel *sch;
840
841 sch = to_subchannel(cdev->dev.parent);
edf22096 842 if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
1da177e4
LT		 843 /* Couldn't enable the subchannel for i/o. Sick device. */
844 return;
1da177e4
LT		 845 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
846 ccw_device_sense_id_start(cdev);
847}
848
c820de39 849void ccw_device_trigger_reprobe(struct ccw_device *cdev)
1da177e4 850{
c820de39 851 struct subchannel *sch;
1da177e4 852
1da177e4
LT		 853 if (cdev->private->state != DEV_STATE_DISCONNECTED)
854 return;
855
c820de39 856 sch = to_subchannel(cdev->dev.parent);
1da177e4 857 /* Update some values. */
cdb912a4 858 if (cio_update_schib(sch))
7674da77 859 return;
1da177e4
LT		 860 /*
861 * The pim, pam, pom values may not be accurate, but they are the best
862 * we have before performing device selection :/
863 */
28bdc6f6 864 sch->lpm = sch->schib.pmcw.pam & sch->opm;
13952ec1
SO		 865 /*
866 * Use the initial configuration since we can't be shure that the old
867 * paths are valid.
868 */
869 io_subchannel_init_config(sch);
f444cc0e
SO		 870 if (cio_commit_config(sch))
871 return;
13952ec1 872
1da177e4 873 /* We should also udate ssd info, but this has to wait. */
d7b5a4c9 874 /* Check if this is another device which appeared on the same sch. */
5d6e6b6f
PO		 875 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno)
876 css_schedule_eval(sch->schid);
877 else
d7b5a4c9 878 ccw_device_start_id(cdev, 0);
1da177e4
LT		 879}
880
16b9a057
PO		 881static void ccw_device_disabled_irq(struct ccw_device *cdev,
882 enum dev_event dev_event)
1da177e4
LT		 883{
884 struct subchannel *sch;
885
886 sch = to_subchannel(cdev->dev.parent);
887 /*
16b9a057 888 * An interrupt in a disabled state means a previous disable was not
ed04b892 889 * successful - should not happen, but we try to disable again.
1da177e4
LT		 890 */
891 cio_disable_subchannel(sch);
892}
893
894static void
895ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
896{
897 retry_set_schib(cdev);
898 cdev->private->state = DEV_STATE_ONLINE;
899 dev_fsm_event(cdev, dev_event);
900}
901
94bb0633
CH		 902static void ccw_device_update_cmfblock(struct ccw_device *cdev,
903 enum dev_event dev_event)
904{
905 cmf_retry_copy_block(cdev);
906 cdev->private->state = DEV_STATE_ONLINE;
907 dev_fsm_event(cdev, dev_event);
908}
1da177e4
LT		 909
910static void
911ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
912{
913 ccw_device_set_timeout(cdev, 0);
914 if (dev_event == DEV_EVENT_NOTOPER)
915 cdev->private->state = DEV_STATE_NOT_OPER;
916 else
917 cdev->private->state = DEV_STATE_OFFLINE;
918 wake_up(&cdev->private->wait_q);
919}
920
921static void
922ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
923{
924 int ret;
925
926 ret = ccw_device_cancel_halt_clear(cdev);
927 switch (ret) {
928 case 0:
929 cdev->private->state = DEV_STATE_OFFLINE;
930 wake_up(&cdev->private->wait_q);
931 break;
932 case -ENODEV:
933 cdev->private->state = DEV_STATE_NOT_OPER;
934 wake_up(&cdev->private->wait_q);
935 break;
936 default:
937 ccw_device_set_timeout(cdev, HZ/10);
938 }
939}
940
941/*
942 * No operation action. This is used e.g. to ignore a timeout event in
943 * state offline.
944 */
945static void
946ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
947{
948}
949
1da177e4
LT		 950/*
951 * device statemachine
952 */
953fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
954 [DEV_STATE_NOT_OPER] = {
955 [DEV_EVENT_NOTOPER] = ccw_device_nop,
16b9a057 956 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4
LT		 957 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
958 [DEV_EVENT_VERIFY] = ccw_device_nop,
959 },
960 [DEV_STATE_SENSE_PGID] = {
9679baaf
PO		 961 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
962 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
963 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 964 [DEV_EVENT_VERIFY] = ccw_device_nop,
965 },
966 [DEV_STATE_SENSE_ID] = {
39f5360b
PO		 967 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
968 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
969 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 970 [DEV_EVENT_VERIFY] = ccw_device_nop,
971 },
972 [DEV_STATE_OFFLINE] = {
3f4cf6e7 973 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
16b9a057 974 [DEV_EVENT_INTERRUPT] = ccw_device_disabled_irq,
1da177e4 975 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1f1148c8 976 [DEV_EVENT_VERIFY] = ccw_device_offline_verify,
1da177e4
LT		 977 },
978 [DEV_STATE_VERIFY] = {
9679baaf
PO		 979 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
980 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
981 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
28bdc6f6 982 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
1da177e4
LT		 983 },
984 [DEV_STATE_ONLINE] = {
3f4cf6e7 985 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 986 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
987 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
988 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
989 },
990 [DEV_STATE_W4SENSE] = {
3f4cf6e7 991 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 992 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
993 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
994 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
995 },
996 [DEV_STATE_DISBAND_PGID] = {
9679baaf
PO		 997 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
998 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
999 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 1000 [DEV_EVENT_VERIFY] = ccw_device_nop,
1001 },
1002 [DEV_STATE_BOXED] = {
3f4cf6e7 1003 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
d7d12ef2
PO		 1004 [DEV_EVENT_INTERRUPT] = ccw_device_nop,
1005 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1006 [DEV_EVENT_VERIFY] = ccw_device_boxed_verify,
1da177e4
LT		 1007 },
1008 /* states to wait for i/o completion before doing something */
1da177e4 1009 [DEV_STATE_TIMEOUT_KILL] = {
3f4cf6e7 1010 [DEV_EVENT_NOTOPER] = ccw_device_generic_notoper,
1da177e4
LT		 1011 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1012 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1013 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1014 },
1da177e4
LT		 1015 [DEV_STATE_QUIESCE] = {
1016 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1017 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1018 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1019 [DEV_EVENT_VERIFY] = ccw_device_nop,
1020 },
1021 /* special states for devices gone not operational */
1022 [DEV_STATE_DISCONNECTED] = {
1023 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1024 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
16b9a057 1025 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
28bdc6f6 1026 [DEV_EVENT_VERIFY] = ccw_device_start_id,
1da177e4
LT		 1027 },
1028 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
39f5360b
PO		 1029 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1030 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1031 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1da177e4
LT		 1032 [DEV_EVENT_VERIFY] = ccw_device_nop,
1033 },
1034 [DEV_STATE_CMFCHANGE] = {
1035 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1036 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1037 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1038 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1039 },
94bb0633
CH		 1040 [DEV_STATE_CMFUPDATE] = {
1041 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1042 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1043 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1044 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1045 },
d7d12ef2
PO		 1046 [DEV_STATE_STEAL_LOCK] = {
1047 [DEV_EVENT_NOTOPER] = ccw_device_request_event,
1048 [DEV_EVENT_INTERRUPT] = ccw_device_request_event,
1049 [DEV_EVENT_TIMEOUT] = ccw_device_request_event,
1050 [DEV_EVENT_VERIFY] = ccw_device_nop,
1051 },
1da177e4
LT		 1052};
1053
1da177e4 1054EXPORT_SYMBOL_GPL(ccw_device_set_timeout);
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