blob: eed14572fc3b01e3445ee30a46e30bae6a15a006 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/s390/cio/device_fsm.c
3 * finite state machine for device handling
4 *
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
Cornelia Huck4ce3b302006-01-14 13:21:04 -08007 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 */
10
11#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/init.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080013#include <linux/jiffies.h>
14#include <linux/string.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <asm/ccwdev.h>
Cornelia Huck4c24da72005-09-03 15:58:01 -070017#include <asm/cio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26int
27device_is_online(struct subchannel *sch)
28{
29 struct ccw_device *cdev;
30
31 if (!sch->dev.driver_data)
32 return 0;
33 cdev = sch->dev.driver_data;
34 return (cdev->private->state == DEV_STATE_ONLINE);
35}
36
37int
38device_is_disconnected(struct subchannel *sch)
39{
40 struct ccw_device *cdev;
41
42 if (!sch->dev.driver_data)
43 return 0;
44 cdev = sch->dev.driver_data;
45 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
46 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
47}
48
49void
50device_set_disconnected(struct subchannel *sch)
51{
52 struct ccw_device *cdev;
53
54 if (!sch->dev.driver_data)
55 return;
56 cdev = sch->dev.driver_data;
57 ccw_device_set_timeout(cdev, 0);
58 cdev->private->flags.fake_irb = 0;
59 cdev->private->state = DEV_STATE_DISCONNECTED;
60}
61
Cornelia Huckd23861f2006-12-04 15:41:04 +010062void device_set_intretry(struct subchannel *sch)
63{
64 struct ccw_device *cdev;
65
66 cdev = sch->dev.driver_data;
67 if (!cdev)
68 return;
69 cdev->private->flags.intretry = 1;
70}
71
Cornelia Huck24cb5b42006-12-04 15:41:01 +010072int device_trigger_verify(struct subchannel *sch)
73{
74 struct ccw_device *cdev;
75
76 cdev = sch->dev.driver_data;
77 if (!cdev || !cdev->online)
78 return -EINVAL;
79 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
80 return 0;
81}
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083/*
84 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
85 */
86static void
87ccw_device_timeout(unsigned long data)
88{
89 struct ccw_device *cdev;
90
91 cdev = (struct ccw_device *) data;
92 spin_lock_irq(cdev->ccwlock);
93 dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
94 spin_unlock_irq(cdev->ccwlock);
95}
96
97/*
98 * Set timeout
99 */
100void
101ccw_device_set_timeout(struct ccw_device *cdev, int expires)
102{
103 if (expires == 0) {
104 del_timer(&cdev->private->timer);
105 return;
106 }
107 if (timer_pending(&cdev->private->timer)) {
108 if (mod_timer(&cdev->private->timer, jiffies + expires))
109 return;
110 }
111 cdev->private->timer.function = ccw_device_timeout;
112 cdev->private->timer.data = (unsigned long) cdev;
113 cdev->private->timer.expires = jiffies + expires;
114 add_timer(&cdev->private->timer);
115}
116
117/* Kill any pending timers after machine check. */
118void
119device_kill_pending_timer(struct subchannel *sch)
120{
121 struct ccw_device *cdev;
122
123 if (!sch->dev.driver_data)
124 return;
125 cdev = sch->dev.driver_data;
126 ccw_device_set_timeout(cdev, 0);
127}
128
129/*
130 * Cancel running i/o. This is called repeatedly since halt/clear are
131 * asynchronous operations. We do one try with cio_cancel, two tries
132 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
133 * Returns 0 if device now idle, -ENODEV for device not operational and
134 * -EBUSY if an interrupt is expected (either from halt/clear or from a
135 * status pending).
136 */
137int
138ccw_device_cancel_halt_clear(struct ccw_device *cdev)
139{
140 struct subchannel *sch;
141 int ret;
142
143 sch = to_subchannel(cdev->dev.parent);
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800144 ret = stsch(sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (ret || !sch->schib.pmcw.dnv)
146 return -ENODEV;
147 if (!sch->schib.pmcw.ena || sch->schib.scsw.actl == 0)
148 /* Not operational or no activity -> done. */
149 return 0;
150 /* Stage 1: cancel io. */
151 if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
152 !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
153 ret = cio_cancel(sch);
154 if (ret != -EINVAL)
155 return ret;
156 /* cancel io unsuccessful. From now on it is asynchronous. */
157 cdev->private->iretry = 3; /* 3 halt retries. */
158 }
159 if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
160 /* Stage 2: halt io. */
161 if (cdev->private->iretry) {
162 cdev->private->iretry--;
163 ret = cio_halt(sch);
Peter Oberparleiterba4ba8a2006-07-27 14:00:23 +0200164 if (ret != -EBUSY)
165 return (ret == 0) ? -EBUSY : ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
167 /* halt io unsuccessful. */
168 cdev->private->iretry = 255; /* 255 clear retries. */
169 }
170 /* Stage 3: clear io. */
171 if (cdev->private->iretry) {
172 cdev->private->iretry--;
173 ret = cio_clear (sch);
174 return (ret == 0) ? -EBUSY : ret;
175 }
176 panic("Can't stop i/o on subchannel.\n");
177}
178
179static int
180ccw_device_handle_oper(struct ccw_device *cdev)
181{
182 struct subchannel *sch;
183
184 sch = to_subchannel(cdev->dev.parent);
185 cdev->private->flags.recog_done = 1;
186 /*
187 * Check if cu type and device type still match. If
188 * not, it is certainly another device and we have to
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100189 * de- and re-register.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 */
191 if (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 ||
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100194 cdev->id.dev_model != cdev->private->senseid.dev_model) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100196 ccw_device_do_unreg_rereg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 queue_work(ccw_device_work, &cdev->private->kick_work);
198 return 0;
199 }
200 cdev->private->flags.donotify = 1;
201 return 1;
202}
203
204/*
205 * The machine won't give us any notification by machine check if a chpid has
206 * been varied online on the SE so we have to find out by magic (i. e. driving
207 * the channel subsystem to device selection and updating our path masks).
208 */
209static inline void
210__recover_lost_chpids(struct subchannel *sch, int old_lpm)
211{
212 int mask, i;
213
214 for (i = 0; i<8; i++) {
215 mask = 0x80 >> i;
216 if (!(sch->lpm & mask))
217 continue;
218 if (old_lpm & mask)
219 continue;
220 chpid_is_actually_online(sch->schib.pmcw.chpid[i]);
221 }
222}
223
224/*
225 * Stop device recognition.
226 */
227static void
228ccw_device_recog_done(struct ccw_device *cdev, int state)
229{
230 struct subchannel *sch;
231 int notify, old_lpm, same_dev;
232
233 sch = to_subchannel(cdev->dev.parent);
234
235 ccw_device_set_timeout(cdev, 0);
236 cio_disable_subchannel(sch);
237 /*
238 * Now that we tried recognition, we have performed device selection
239 * through ssch() and the path information is up to date.
240 */
241 old_lpm = sch->lpm;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800242 stsch(sch->schid, &sch->schib);
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200243 sch->lpm = sch->schib.pmcw.pam & sch->opm;
Cornelia Huck4ffa9232005-07-29 14:03:37 -0700244 /* Check since device may again have become not operational. */
245 if (!sch->schib.pmcw.dnv)
246 state = DEV_STATE_NOT_OPER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
248 /* Force reprobe on all chpids. */
249 old_lpm = 0;
250 if (sch->lpm != old_lpm)
251 __recover_lost_chpids(sch, old_lpm);
252 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
253 if (state == DEV_STATE_NOT_OPER) {
254 cdev->private->flags.recog_done = 1;
255 cdev->private->state = DEV_STATE_DISCONNECTED;
256 return;
257 }
258 /* Boxed devices don't need extra treatment. */
259 }
260 notify = 0;
261 same_dev = 0; /* Keep the compiler quiet... */
262 switch (state) {
263 case DEV_STATE_NOT_OPER:
264 CIO_DEBUG(KERN_WARNING, 2,
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800265 "SenseID : unknown device %04x on subchannel "
Cornelia Huck78964262006-10-11 15:31:38 +0200266 "0.%x.%04x\n", cdev->private->dev_id.devno,
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800267 sch->schid.ssid, sch->schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 break;
269 case DEV_STATE_OFFLINE:
270 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
271 same_dev = ccw_device_handle_oper(cdev);
272 notify = 1;
273 }
274 /* fill out sense information */
Heiko Carstens81388d22006-09-20 15:59:17 +0200275 memset(&cdev->id, 0, sizeof(cdev->id));
Heiko Carstens292888c2006-08-30 14:33:35 +0200276 cdev->id.cu_type = cdev->private->senseid.cu_type;
277 cdev->id.cu_model = cdev->private->senseid.cu_model;
278 cdev->id.dev_type = cdev->private->senseid.dev_type;
279 cdev->id.dev_model = cdev->private->senseid.dev_model;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (notify) {
281 cdev->private->state = DEV_STATE_OFFLINE;
282 if (same_dev) {
283 /* Get device online again. */
284 ccw_device_online(cdev);
285 wake_up(&cdev->private->wait_q);
286 }
287 return;
288 }
289 /* Issue device info message. */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800290 CIO_DEBUG(KERN_INFO, 2, "SenseID : device 0.%x.%04x reports: "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 "CU Type/Mod = %04X/%02X, Dev Type/Mod = "
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800292 "%04X/%02X\n",
Cornelia Huck78964262006-10-11 15:31:38 +0200293 cdev->private->dev_id.ssid,
294 cdev->private->dev_id.devno,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 cdev->id.cu_type, cdev->id.cu_model,
296 cdev->id.dev_type, cdev->id.dev_model);
297 break;
298 case DEV_STATE_BOXED:
299 CIO_DEBUG(KERN_WARNING, 2,
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800300 "SenseID : boxed device %04x on subchannel "
Cornelia Huck78964262006-10-11 15:31:38 +0200301 "0.%x.%04x\n", cdev->private->dev_id.devno,
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800302 sch->schid.ssid, sch->schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 break;
304 }
305 cdev->private->state = state;
306 io_subchannel_recog_done(cdev);
307 if (state != DEV_STATE_NOT_OPER)
308 wake_up(&cdev->private->wait_q);
309}
310
311/*
312 * Function called from device_id.c after sense id has completed.
313 */
314void
315ccw_device_sense_id_done(struct ccw_device *cdev, int err)
316{
317 switch (err) {
318 case 0:
319 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
320 break;
321 case -ETIME: /* Sense id stopped by timeout. */
322 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
323 break;
324 default:
325 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
326 break;
327 }
328}
329
330static void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100331ccw_device_oper_notify(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100333 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 struct ccw_device *cdev;
335 struct subchannel *sch;
336 int ret;
337
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100338 priv = container_of(work, struct ccw_device_private, kick_work);
339 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 sch = to_subchannel(cdev->dev.parent);
341 ret = (sch->driver && sch->driver->notify) ?
342 sch->driver->notify(&sch->dev, CIO_OPER) : 0;
343 if (!ret)
344 /* Driver doesn't want device back. */
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100345 ccw_device_do_unreg_rereg(work);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200346 else {
347 /* Reenable channel measurements, if needed. */
348 cmf_reenable(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 wake_up(&cdev->private->wait_q);
Cornelia Huck94bb0632006-06-29 15:08:41 +0200350 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
353/*
354 * Finished with online/offline processing.
355 */
356static void
357ccw_device_done(struct ccw_device *cdev, int state)
358{
359 struct subchannel *sch;
360
361 sch = to_subchannel(cdev->dev.parent);
362
Cornelia Huckf1ee3282006-10-04 20:02:02 +0200363 ccw_device_set_timeout(cdev, 0);
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (state != DEV_STATE_ONLINE)
366 cio_disable_subchannel(sch);
367
368 /* Reset device status. */
369 memset(&cdev->private->irb, 0, sizeof(struct irb));
370
371 cdev->private->state = state;
372
373
374 if (state == DEV_STATE_BOXED)
375 CIO_DEBUG(KERN_WARNING, 2,
376 "Boxed device %04x on subchannel %04x\n",
Cornelia Huck78964262006-10-11 15:31:38 +0200377 cdev->private->dev_id.devno, sch->schid.sch_no);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 if (cdev->private->flags.donotify) {
380 cdev->private->flags.donotify = 0;
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100381 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
383 }
384 wake_up(&cdev->private->wait_q);
385
386 if (css_init_done && state != DEV_STATE_ONLINE)
387 put_device (&cdev->dev);
388}
389
Cornelia Huck7e560812006-07-12 16:40:19 +0200390static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
391{
392 char *c1;
393 char *c2;
394
395 c1 = (char *)p1;
396 c2 = (char *)p2;
397
398 return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
399}
400
401static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
402{
403 int i;
404 int last;
405
406 last = 0;
407 for (i = 0; i < 8; i++) {
408 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
409 /* No PGID yet */
410 continue;
411 if (cdev->private->pgid[last].inf.ps.state1 ==
412 SNID_STATE1_RESET) {
413 /* First non-zero PGID */
414 last = i;
415 continue;
416 }
417 if (cmp_pgid(&cdev->private->pgid[i],
418 &cdev->private->pgid[last]) == 0)
419 /* Non-conflicting PGIDs */
420 continue;
421
422 /* PGID mismatch, can't pathgroup. */
423 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
424 "0.%x.%04x, can't pathgroup\n",
Cornelia Huck78964262006-10-11 15:31:38 +0200425 cdev->private->dev_id.ssid,
426 cdev->private->dev_id.devno);
Cornelia Huck7e560812006-07-12 16:40:19 +0200427 cdev->private->options.pgroup = 0;
428 return;
429 }
430 if (cdev->private->pgid[last].inf.ps.state1 ==
431 SNID_STATE1_RESET)
432 /* No previous pgid found */
433 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
434 sizeof(struct pgid));
435 else
436 /* Use existing pgid */
437 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
438 sizeof(struct pgid));
439}
440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441/*
442 * Function called from device_pgid.c after sense path ground has completed.
443 */
444void
445ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
446{
447 struct subchannel *sch;
448
449 sch = to_subchannel(cdev->dev.parent);
450 switch (err) {
Cornelia Huck7e560812006-07-12 16:40:19 +0200451 case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
452 cdev->private->options.pgroup = 0;
453 break;
454 case 0: /* success */
455 case -EACCES: /* partial success, some paths not operational */
456 /* Check if all pgids are equal or 0. */
457 __ccw_device_get_common_pgid(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 break;
459 case -ETIME: /* Sense path group id stopped by timeout. */
460 case -EUSERS: /* device is reserved for someone else. */
461 ccw_device_done(cdev, DEV_STATE_BOXED);
Cornelia Huck7e560812006-07-12 16:40:19 +0200462 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 default:
464 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
Cornelia Huck7e560812006-07-12 16:40:19 +0200465 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
Cornelia Huck7e560812006-07-12 16:40:19 +0200467 /* Start Path Group verification. */
Cornelia Huck7e560812006-07-12 16:40:19 +0200468 cdev->private->state = DEV_STATE_VERIFY;
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200469 cdev->private->flags.doverify = 0;
Cornelia Huck7e560812006-07-12 16:40:19 +0200470 ccw_device_verify_start(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
473/*
474 * Start device recognition.
475 */
476int
477ccw_device_recognition(struct ccw_device *cdev)
478{
479 struct subchannel *sch;
480 int ret;
481
482 if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
483 (cdev->private->state != DEV_STATE_BOXED))
484 return -EINVAL;
485 sch = to_subchannel(cdev->dev.parent);
486 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
487 if (ret != 0)
488 /* Couldn't enable the subchannel for i/o. Sick device. */
489 return ret;
490
491 /* After 60s the device recognition is considered to have failed. */
492 ccw_device_set_timeout(cdev, 60*HZ);
493
494 /*
495 * We used to start here with a sense pgid to find out whether a device
496 * is locked by someone else. Unfortunately, the sense pgid command
497 * code has other meanings on devices predating the path grouping
498 * algorithm, so we start with sense id and box the device after an
499 * timeout (or if sense pgid during path verification detects the device
500 * is locked, as may happen on newer devices).
501 */
502 cdev->private->flags.recog_done = 0;
503 cdev->private->state = DEV_STATE_SENSE_ID;
504 ccw_device_sense_id_start(cdev);
505 return 0;
506}
507
508/*
509 * Handle timeout in device recognition.
510 */
511static void
512ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
513{
514 int ret;
515
516 ret = ccw_device_cancel_halt_clear(cdev);
517 switch (ret) {
518 case 0:
519 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
520 break;
521 case -ENODEV:
522 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
523 break;
524 default:
525 ccw_device_set_timeout(cdev, 3*HZ);
526 }
527}
528
529
530static void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100531ccw_device_nopath_notify(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100533 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 struct ccw_device *cdev;
535 struct subchannel *sch;
536 int ret;
537
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100538 priv = container_of(work, struct ccw_device_private, kick_work);
539 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 sch = to_subchannel(cdev->dev.parent);
541 /* Extra sanity. */
542 if (sch->lpm)
543 return;
544 ret = (sch->driver && sch->driver->notify) ?
545 sch->driver->notify(&sch->dev, CIO_NO_PATH) : 0;
546 if (!ret) {
547 if (get_device(&sch->dev)) {
548 /* Driver doesn't want to keep device. */
549 cio_disable_subchannel(sch);
550 if (get_device(&cdev->dev)) {
551 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100552 ccw_device_call_sch_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 queue_work(ccw_device_work,
554 &cdev->private->kick_work);
555 } else
556 put_device(&sch->dev);
557 }
558 } else {
559 cio_disable_subchannel(sch);
560 ccw_device_set_timeout(cdev, 0);
561 cdev->private->flags.fake_irb = 0;
562 cdev->private->state = DEV_STATE_DISCONNECTED;
563 wake_up(&cdev->private->wait_q);
564 }
565}
566
567void
568ccw_device_verify_done(struct ccw_device *cdev, int err)
569{
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200570 struct subchannel *sch;
571
572 sch = to_subchannel(cdev->dev.parent);
573 /* Update schib - pom may have changed. */
574 stsch(sch->schid, &sch->schib);
575 /* Update lpm with verified path mask. */
576 sch->lpm = sch->vpm;
577 /* Repeat path verification? */
578 if (cdev->private->flags.doverify) {
579 cdev->private->flags.doverify = 0;
580 ccw_device_verify_start(cdev);
581 return;
582 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 switch (err) {
584 case -EOPNOTSUPP: /* path grouping not supported, just set online. */
585 cdev->private->options.pgroup = 0;
586 case 0:
587 ccw_device_done(cdev, DEV_STATE_ONLINE);
588 /* Deliver fake irb to device driver, if needed. */
589 if (cdev->private->flags.fake_irb) {
590 memset(&cdev->private->irb, 0, sizeof(struct irb));
Heiko Carstens292888c2006-08-30 14:33:35 +0200591 cdev->private->irb.scsw.cc = 1;
592 cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
593 cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
594 cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 cdev->private->flags.fake_irb = 0;
596 if (cdev->handler)
597 cdev->handler(cdev, cdev->private->intparm,
598 &cdev->private->irb);
599 memset(&cdev->private->irb, 0, sizeof(struct irb));
600 }
601 break;
602 case -ETIME:
Peter Oberparleiter8b42f5c2006-10-18 18:30:43 +0200603 /* Reset oper notify indication after verify error. */
604 cdev->private->flags.donotify = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 ccw_device_done(cdev, DEV_STATE_BOXED);
606 break;
607 default:
Peter Oberparleiter8b42f5c2006-10-18 18:30:43 +0200608 /* Reset oper notify indication after verify error. */
609 cdev->private->flags.donotify = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100611 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
613 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
614 break;
615 }
616}
617
618/*
619 * Get device online.
620 */
621int
622ccw_device_online(struct ccw_device *cdev)
623{
624 struct subchannel *sch;
625 int ret;
626
627 if ((cdev->private->state != DEV_STATE_OFFLINE) &&
628 (cdev->private->state != DEV_STATE_BOXED))
629 return -EINVAL;
630 sch = to_subchannel(cdev->dev.parent);
631 if (css_init_done && !get_device(&cdev->dev))
632 return -ENODEV;
633 ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
634 if (ret != 0) {
635 /* Couldn't enable the subchannel for i/o. Sick device. */
636 if (ret == -ENODEV)
637 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
638 return ret;
639 }
640 /* Do we want to do path grouping? */
641 if (!cdev->private->options.pgroup) {
Cornelia Huck7e560812006-07-12 16:40:19 +0200642 /* Start initial path verification. */
643 cdev->private->state = DEV_STATE_VERIFY;
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200644 cdev->private->flags.doverify = 0;
Cornelia Huck7e560812006-07-12 16:40:19 +0200645 ccw_device_verify_start(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return 0;
647 }
648 /* Do a SensePGID first. */
649 cdev->private->state = DEV_STATE_SENSE_PGID;
650 ccw_device_sense_pgid_start(cdev);
651 return 0;
652}
653
654void
655ccw_device_disband_done(struct ccw_device *cdev, int err)
656{
657 switch (err) {
658 case 0:
659 ccw_device_done(cdev, DEV_STATE_OFFLINE);
660 break;
661 case -ETIME:
662 ccw_device_done(cdev, DEV_STATE_BOXED);
663 break;
664 default:
665 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
666 break;
667 }
668}
669
670/*
671 * Shutdown device.
672 */
673int
674ccw_device_offline(struct ccw_device *cdev)
675{
676 struct subchannel *sch;
677
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100678 if (ccw_device_is_orphan(cdev)) {
679 ccw_device_done(cdev, DEV_STATE_OFFLINE);
680 return 0;
681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 sch = to_subchannel(cdev->dev.parent);
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800683 if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 return -ENODEV;
685 if (cdev->private->state != DEV_STATE_ONLINE) {
686 if (sch->schib.scsw.actl != 0)
687 return -EBUSY;
688 return -EINVAL;
689 }
690 if (sch->schib.scsw.actl != 0)
691 return -EBUSY;
692 /* Are we doing path grouping? */
693 if (!cdev->private->options.pgroup) {
694 /* No, set state offline immediately. */
695 ccw_device_done(cdev, DEV_STATE_OFFLINE);
696 return 0;
697 }
698 /* Start Set Path Group commands. */
699 cdev->private->state = DEV_STATE_DISBAND_PGID;
700 ccw_device_disband_start(cdev);
701 return 0;
702}
703
704/*
705 * Handle timeout in device online/offline process.
706 */
707static void
708ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
709{
710 int ret;
711
712 ret = ccw_device_cancel_halt_clear(cdev);
713 switch (ret) {
714 case 0:
715 ccw_device_done(cdev, DEV_STATE_BOXED);
716 break;
717 case -ENODEV:
718 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
719 break;
720 default:
721 ccw_device_set_timeout(cdev, 3*HZ);
722 }
723}
724
725/*
726 * Handle not oper event in device recognition.
727 */
728static void
729ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
730{
731 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
732}
733
734/*
735 * Handle not operational event while offline.
736 */
737static void
738ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
739{
740 struct subchannel *sch;
741
742 cdev->private->state = DEV_STATE_NOT_OPER;
743 sch = to_subchannel(cdev->dev.parent);
744 if (get_device(&cdev->dev)) {
745 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100746 ccw_device_call_sch_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 queue_work(ccw_device_work, &cdev->private->kick_work);
748 }
749 wake_up(&cdev->private->wait_q);
750}
751
752/*
753 * Handle not operational event while online.
754 */
755static void
756ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
757{
758 struct subchannel *sch;
759
760 sch = to_subchannel(cdev->dev.parent);
761 if (sch->driver->notify &&
762 sch->driver->notify(&sch->dev, sch->lpm ? CIO_GONE : CIO_NO_PATH)) {
763 ccw_device_set_timeout(cdev, 0);
764 cdev->private->flags.fake_irb = 0;
765 cdev->private->state = DEV_STATE_DISCONNECTED;
766 wake_up(&cdev->private->wait_q);
767 return;
768 }
769 cdev->private->state = DEV_STATE_NOT_OPER;
770 cio_disable_subchannel(sch);
771 if (sch->schib.scsw.actl != 0) {
772 // FIXME: not-oper indication to device driver ?
773 ccw_device_call_handler(cdev);
774 }
775 if (get_device(&cdev->dev)) {
776 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100777 ccw_device_call_sch_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 queue_work(ccw_device_work, &cdev->private->kick_work);
779 }
780 wake_up(&cdev->private->wait_q);
781}
782
783/*
784 * Handle path verification event.
785 */
786static void
787ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
788{
789 struct subchannel *sch;
790
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 if (cdev->private->state == DEV_STATE_W4SENSE) {
792 cdev->private->flags.doverify = 1;
793 return;
794 }
795 sch = to_subchannel(cdev->dev.parent);
796 /*
797 * Since we might not just be coming from an interrupt from the
798 * subchannel we have to update the schib.
799 */
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800800 stsch(sch->schid, &sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802 if (sch->schib.scsw.actl != 0 ||
Peter Oberparleiter65200c22006-08-07 17:00:33 +0200803 (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
805 /*
806 * No final status yet or final status not yet delivered
807 * to the device driver. Can't do path verfication now,
808 * delay until final status was delivered.
809 */
810 cdev->private->flags.doverify = 1;
811 return;
812 }
813 /* Device is idle, we can do the path verification. */
814 cdev->private->state = DEV_STATE_VERIFY;
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +0200815 cdev->private->flags.doverify = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 ccw_device_verify_start(cdev);
817}
818
819/*
820 * Got an interrupt for a normal io (state online).
821 */
822static void
823ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
824{
825 struct irb *irb;
826
827 irb = (struct irb *) __LC_IRB;
828 /* Check for unsolicited interrupt. */
829 if ((irb->scsw.stctl ==
830 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
831 && (!irb->scsw.cc)) {
832 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
833 !irb->esw.esw0.erw.cons) {
834 /* Unit check but no sense data. Need basic sense. */
835 if (ccw_device_do_sense(cdev, irb) != 0)
836 goto call_handler_unsol;
Cornelia Hucke0ec5742006-06-04 02:51:27 -0700837 memcpy(&cdev->private->irb, irb, sizeof(struct irb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 cdev->private->state = DEV_STATE_W4SENSE;
839 cdev->private->intparm = 0;
840 return;
841 }
842call_handler_unsol:
843 if (cdev->handler)
844 cdev->handler (cdev, 0, irb);
845 return;
846 }
847 /* Accumulate status and find out if a basic sense is needed. */
848 ccw_device_accumulate_irb(cdev, irb);
849 if (cdev->private->flags.dosense) {
850 if (ccw_device_do_sense(cdev, irb) == 0) {
851 cdev->private->state = DEV_STATE_W4SENSE;
852 }
853 return;
854 }
855 /* Call the handler. */
856 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
857 /* Start delayed path verification. */
858 ccw_device_online_verify(cdev, 0);
859}
860
861/*
862 * Got an timeout in online state.
863 */
864static void
865ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
866{
867 int ret;
868
869 ccw_device_set_timeout(cdev, 0);
870 ret = ccw_device_cancel_halt_clear(cdev);
871 if (ret == -EBUSY) {
872 ccw_device_set_timeout(cdev, 3*HZ);
873 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
874 return;
875 }
876 if (ret == -ENODEV) {
877 struct subchannel *sch;
878
879 sch = to_subchannel(cdev->dev.parent);
880 if (!sch->lpm) {
881 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100882 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 queue_work(ccw_device_notify_work,
884 &cdev->private->kick_work);
885 } else
886 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
887 } else if (cdev->handler)
888 cdev->handler(cdev, cdev->private->intparm,
889 ERR_PTR(-ETIMEDOUT));
890}
891
892/*
893 * Got an interrupt for a basic sense.
894 */
895void
896ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
897{
898 struct irb *irb;
899
900 irb = (struct irb *) __LC_IRB;
901 /* Check for unsolicited interrupt. */
902 if (irb->scsw.stctl ==
903 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
904 if (irb->scsw.cc == 1)
905 /* Basic sense hasn't started. Try again. */
906 ccw_device_do_sense(cdev, irb);
907 else {
Cornelia Huck08983782006-10-11 15:31:30 +0200908 printk(KERN_INFO "Huh? %s(%s): unsolicited "
909 "interrupt...\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 __FUNCTION__, cdev->dev.bus_id);
911 if (cdev->handler)
912 cdev->handler (cdev, 0, irb);
913 }
914 return;
915 }
Cornelia Huck3ba19982006-03-24 03:15:12 -0800916 /*
917 * Check if a halt or clear has been issued in the meanwhile. If yes,
918 * only deliver the halt/clear interrupt to the device driver as if it
919 * had killed the original request.
920 */
921 if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
Cornelia Huckd23861f2006-12-04 15:41:04 +0100922 /* Retry Basic Sense if requested. */
923 if (cdev->private->flags.intretry) {
924 cdev->private->flags.intretry = 0;
925 ccw_device_do_sense(cdev, irb);
926 return;
927 }
Cornelia Huck3ba19982006-03-24 03:15:12 -0800928 cdev->private->flags.dosense = 0;
929 memset(&cdev->private->irb, 0, sizeof(struct irb));
930 ccw_device_accumulate_irb(cdev, irb);
931 goto call_handler;
932 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 /* Add basic sense info to irb. */
934 ccw_device_accumulate_basic_sense(cdev, irb);
935 if (cdev->private->flags.dosense) {
936 /* Another basic sense is needed. */
937 ccw_device_do_sense(cdev, irb);
938 return;
939 }
Cornelia Huck3ba19982006-03-24 03:15:12 -0800940call_handler:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 cdev->private->state = DEV_STATE_ONLINE;
942 /* Call the handler. */
943 if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
944 /* Start delayed path verification. */
945 ccw_device_online_verify(cdev, 0);
946}
947
948static void
949ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
950{
951 struct irb *irb;
952
953 irb = (struct irb *) __LC_IRB;
954 /* Accumulate status. We don't do basic sense. */
955 ccw_device_accumulate_irb(cdev, irb);
Cornelia Huckb4f7b1e2006-06-29 15:03:35 +0200956 /* Remember to clear irb to avoid residuals. */
957 memset(&cdev->private->irb, 0, sizeof(struct irb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 /* Try to start delayed device verification. */
959 ccw_device_online_verify(cdev, 0);
960 /* Note: Don't call handler for cio initiated clear! */
961}
962
963static void
964ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
965{
966 struct subchannel *sch;
967
968 sch = to_subchannel(cdev->dev.parent);
969 ccw_device_set_timeout(cdev, 0);
970 /* OK, i/o is dead now. Call interrupt handler. */
971 cdev->private->state = DEV_STATE_ONLINE;
972 if (cdev->handler)
973 cdev->handler(cdev, cdev->private->intparm,
Cornelia Hucke7769b42006-10-11 15:31:41 +0200974 ERR_PTR(-EIO));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 if (!sch->lpm) {
976 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100977 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
979 } else if (cdev->private->flags.doverify)
980 /* Start delayed path verification. */
981 ccw_device_online_verify(cdev, 0);
982}
983
984static void
985ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
986{
987 int ret;
988
989 ret = ccw_device_cancel_halt_clear(cdev);
990 if (ret == -EBUSY) {
991 ccw_device_set_timeout(cdev, 3*HZ);
992 return;
993 }
994 if (ret == -ENODEV) {
995 struct subchannel *sch;
996
997 sch = to_subchannel(cdev->dev.parent);
998 if (!sch->lpm) {
999 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001000 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 queue_work(ccw_device_notify_work,
1002 &cdev->private->kick_work);
1003 } else
1004 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1005 return;
1006 }
1007 //FIXME: Can we get here?
1008 cdev->private->state = DEV_STATE_ONLINE;
1009 if (cdev->handler)
1010 cdev->handler(cdev, cdev->private->intparm,
Cornelia Hucke7769b42006-10-11 15:31:41 +02001011 ERR_PTR(-EIO));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012}
1013
Cornelia Hucke7769b42006-10-11 15:31:41 +02001014void device_kill_io(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015{
1016 int ret;
Cornelia Hucke7769b42006-10-11 15:31:41 +02001017 struct ccw_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Cornelia Hucke7769b42006-10-11 15:31:41 +02001019 cdev = sch->dev.driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 ret = ccw_device_cancel_halt_clear(cdev);
1021 if (ret == -EBUSY) {
1022 ccw_device_set_timeout(cdev, 3*HZ);
1023 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1024 return;
1025 }
1026 if (ret == -ENODEV) {
1027 if (!sch->lpm) {
1028 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001029 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 queue_work(ccw_device_notify_work,
1031 &cdev->private->kick_work);
1032 } else
1033 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1034 return;
1035 }
1036 if (cdev->handler)
1037 cdev->handler(cdev, cdev->private->intparm,
Cornelia Hucke7769b42006-10-11 15:31:41 +02001038 ERR_PTR(-EIO));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 if (!sch->lpm) {
1040 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001041 ccw_device_nopath_notify);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
Cornelia Hucke7769b42006-10-11 15:31:41 +02001043 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 /* Start delayed path verification. */
1045 ccw_device_online_verify(cdev, 0);
1046}
1047
1048static void
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +02001049ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +02001051 /* Start verification after current task finished. */
Cornelia Huck7e560812006-07-12 16:40:19 +02001052 cdev->private->flags.doverify = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053}
1054
1055static void
1056ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1057{
1058 struct irb *irb;
1059
1060 switch (dev_event) {
1061 case DEV_EVENT_INTERRUPT:
1062 irb = (struct irb *) __LC_IRB;
1063 /* Check for unsolicited interrupt. */
1064 if ((irb->scsw.stctl ==
1065 (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1066 (!irb->scsw.cc))
1067 /* FIXME: we should restart stlck here, but this
1068 * is extremely unlikely ... */
1069 goto out_wakeup;
1070
1071 ccw_device_accumulate_irb(cdev, irb);
1072 /* We don't care about basic sense etc. */
1073 break;
1074 default: /* timeout */
1075 break;
1076 }
1077out_wakeup:
1078 wake_up(&cdev->private->wait_q);
1079}
1080
1081static void
1082ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1083{
1084 struct subchannel *sch;
1085
1086 sch = to_subchannel(cdev->dev.parent);
1087 if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1088 /* Couldn't enable the subchannel for i/o. Sick device. */
1089 return;
1090
1091 /* After 60s the device recognition is considered to have failed. */
1092 ccw_device_set_timeout(cdev, 60*HZ);
1093
1094 cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1095 ccw_device_sense_id_start(cdev);
1096}
1097
1098void
1099device_trigger_reprobe(struct subchannel *sch)
1100{
1101 struct ccw_device *cdev;
1102
1103 if (!sch->dev.driver_data)
1104 return;
1105 cdev = sch->dev.driver_data;
1106 if (cdev->private->state != DEV_STATE_DISCONNECTED)
1107 return;
1108
1109 /* Update some values. */
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001110 if (stsch(sch->schid, &sch->schib))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 return;
Cornelia Huck7674da72006-12-08 15:54:21 +01001112 if (!sch->schib.pmcw.dnv)
1113 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 /*
1115 * The pim, pam, pom values may not be accurate, but they are the best
1116 * we have before performing device selection :/
1117 */
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +02001118 sch->lpm = sch->schib.pmcw.pam & sch->opm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 /* Re-set some bits in the pmcw that were lost. */
1120 sch->schib.pmcw.isc = 3;
1121 sch->schib.pmcw.csense = 1;
1122 sch->schib.pmcw.ena = 0;
1123 if ((sch->lpm & (sch->lpm - 1)) != 0)
1124 sch->schib.pmcw.mp = 1;
1125 sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1126 /* We should also udate ssd info, but this has to wait. */
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001127 /* Check if this is another device which appeared on the same sch. */
1128 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1129 PREPARE_WORK(&cdev->private->kick_work,
1130 ccw_device_move_to_orphanage);
1131 queue_work(ccw_device_work, &cdev->private->kick_work);
1132 } else
1133 ccw_device_start_id(cdev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134}
1135
1136static void
1137ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1138{
1139 struct subchannel *sch;
1140
1141 sch = to_subchannel(cdev->dev.parent);
1142 /*
1143 * An interrupt in state offline means a previous disable was not
1144 * successful. Try again.
1145 */
1146 cio_disable_subchannel(sch);
1147}
1148
1149static void
1150ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1151{
1152 retry_set_schib(cdev);
1153 cdev->private->state = DEV_STATE_ONLINE;
1154 dev_fsm_event(cdev, dev_event);
1155}
1156
Cornelia Huck94bb0632006-06-29 15:08:41 +02001157static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1158 enum dev_event dev_event)
1159{
1160 cmf_retry_copy_block(cdev);
1161 cdev->private->state = DEV_STATE_ONLINE;
1162 dev_fsm_event(cdev, dev_event);
1163}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
1165static void
1166ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1167{
1168 ccw_device_set_timeout(cdev, 0);
1169 if (dev_event == DEV_EVENT_NOTOPER)
1170 cdev->private->state = DEV_STATE_NOT_OPER;
1171 else
1172 cdev->private->state = DEV_STATE_OFFLINE;
1173 wake_up(&cdev->private->wait_q);
1174}
1175
1176static void
1177ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1178{
1179 int ret;
1180
1181 ret = ccw_device_cancel_halt_clear(cdev);
1182 switch (ret) {
1183 case 0:
1184 cdev->private->state = DEV_STATE_OFFLINE;
1185 wake_up(&cdev->private->wait_q);
1186 break;
1187 case -ENODEV:
1188 cdev->private->state = DEV_STATE_NOT_OPER;
1189 wake_up(&cdev->private->wait_q);
1190 break;
1191 default:
1192 ccw_device_set_timeout(cdev, HZ/10);
1193 }
1194}
1195
1196/*
1197 * No operation action. This is used e.g. to ignore a timeout event in
1198 * state offline.
1199 */
1200static void
1201ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1202{
1203}
1204
1205/*
1206 * Bug operation action.
1207 */
1208static void
1209ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1210{
1211 printk(KERN_EMERG "dev_jumptable[%i][%i] == NULL\n",
1212 cdev->private->state, dev_event);
1213 BUG();
1214}
1215
1216/*
1217 * device statemachine
1218 */
1219fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1220 [DEV_STATE_NOT_OPER] = {
1221 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1222 [DEV_EVENT_INTERRUPT] = ccw_device_bug,
1223 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1224 [DEV_EVENT_VERIFY] = ccw_device_nop,
1225 },
1226 [DEV_STATE_SENSE_PGID] = {
1227 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1228 [DEV_EVENT_INTERRUPT] = ccw_device_sense_pgid_irq,
1229 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1230 [DEV_EVENT_VERIFY] = ccw_device_nop,
1231 },
1232 [DEV_STATE_SENSE_ID] = {
1233 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1234 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1235 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1236 [DEV_EVENT_VERIFY] = ccw_device_nop,
1237 },
1238 [DEV_STATE_OFFLINE] = {
1239 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1240 [DEV_EVENT_INTERRUPT] = ccw_device_offline_irq,
1241 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1242 [DEV_EVENT_VERIFY] = ccw_device_nop,
1243 },
1244 [DEV_STATE_VERIFY] = {
1245 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1246 [DEV_EVENT_INTERRUPT] = ccw_device_verify_irq,
1247 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +02001248 [DEV_EVENT_VERIFY] = ccw_device_delay_verify,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 },
1250 [DEV_STATE_ONLINE] = {
1251 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1252 [DEV_EVENT_INTERRUPT] = ccw_device_irq,
1253 [DEV_EVENT_TIMEOUT] = ccw_device_online_timeout,
1254 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1255 },
1256 [DEV_STATE_W4SENSE] = {
1257 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1258 [DEV_EVENT_INTERRUPT] = ccw_device_w4sense,
1259 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1260 [DEV_EVENT_VERIFY] = ccw_device_online_verify,
1261 },
1262 [DEV_STATE_DISBAND_PGID] = {
1263 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1264 [DEV_EVENT_INTERRUPT] = ccw_device_disband_irq,
1265 [DEV_EVENT_TIMEOUT] = ccw_device_onoff_timeout,
1266 [DEV_EVENT_VERIFY] = ccw_device_nop,
1267 },
1268 [DEV_STATE_BOXED] = {
1269 [DEV_EVENT_NOTOPER] = ccw_device_offline_notoper,
1270 [DEV_EVENT_INTERRUPT] = ccw_device_stlck_done,
1271 [DEV_EVENT_TIMEOUT] = ccw_device_stlck_done,
1272 [DEV_EVENT_VERIFY] = ccw_device_nop,
1273 },
1274 /* states to wait for i/o completion before doing something */
1275 [DEV_STATE_CLEAR_VERIFY] = {
1276 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1277 [DEV_EVENT_INTERRUPT] = ccw_device_clear_verify,
1278 [DEV_EVENT_TIMEOUT] = ccw_device_nop,
1279 [DEV_EVENT_VERIFY] = ccw_device_nop,
1280 },
1281 [DEV_STATE_TIMEOUT_KILL] = {
1282 [DEV_EVENT_NOTOPER] = ccw_device_online_notoper,
1283 [DEV_EVENT_INTERRUPT] = ccw_device_killing_irq,
1284 [DEV_EVENT_TIMEOUT] = ccw_device_killing_timeout,
1285 [DEV_EVENT_VERIFY] = ccw_device_nop, //FIXME
1286 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 [DEV_STATE_QUIESCE] = {
1288 [DEV_EVENT_NOTOPER] = ccw_device_quiesce_done,
1289 [DEV_EVENT_INTERRUPT] = ccw_device_quiesce_done,
1290 [DEV_EVENT_TIMEOUT] = ccw_device_quiesce_timeout,
1291 [DEV_EVENT_VERIFY] = ccw_device_nop,
1292 },
1293 /* special states for devices gone not operational */
1294 [DEV_STATE_DISCONNECTED] = {
1295 [DEV_EVENT_NOTOPER] = ccw_device_nop,
1296 [DEV_EVENT_INTERRUPT] = ccw_device_start_id,
1297 [DEV_EVENT_TIMEOUT] = ccw_device_bug,
Peter Oberparleiter28bdc6f2006-09-20 15:59:59 +02001298 [DEV_EVENT_VERIFY] = ccw_device_start_id,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 },
1300 [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1301 [DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
1302 [DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
1303 [DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
1304 [DEV_EVENT_VERIFY] = ccw_device_nop,
1305 },
1306 [DEV_STATE_CMFCHANGE] = {
1307 [DEV_EVENT_NOTOPER] = ccw_device_change_cmfstate,
1308 [DEV_EVENT_INTERRUPT] = ccw_device_change_cmfstate,
1309 [DEV_EVENT_TIMEOUT] = ccw_device_change_cmfstate,
1310 [DEV_EVENT_VERIFY] = ccw_device_change_cmfstate,
1311 },
Cornelia Huck94bb0632006-06-29 15:08:41 +02001312 [DEV_STATE_CMFUPDATE] = {
1313 [DEV_EVENT_NOTOPER] = ccw_device_update_cmfblock,
1314 [DEV_EVENT_INTERRUPT] = ccw_device_update_cmfblock,
1315 [DEV_EVENT_TIMEOUT] = ccw_device_update_cmfblock,
1316 [DEV_EVENT_VERIFY] = ccw_device_update_cmfblock,
1317 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318};
1319
1320/*
1321 * io_subchannel_irq is called for "real" interrupts or for status
1322 * pending conditions on msch.
1323 */
1324void
1325io_subchannel_irq (struct device *pdev)
1326{
1327 struct ccw_device *cdev;
1328
1329 cdev = to_subchannel(pdev)->dev.driver_data;
1330
1331 CIO_TRACE_EVENT (3, "IRQ");
1332 CIO_TRACE_EVENT (3, pdev->bus_id);
1333 if (cdev)
1334 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1335}
1336
1337EXPORT_SYMBOL_GPL(ccw_device_set_timeout);