device_fsm.c 33.9 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
/*
 * drivers/s390/cio/device_fsm.c
 * finite state machine for device handling
 *
Cornelia Huck's avatar
Cornelia Huck committed
5
 *    Copyright IBM Corp. 2002,2008
6
 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds's avatar
Linus Torvalds committed
7
8
9
10
11
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#include <linux/module.h>
#include <linux/init.h>
Tim Schmielau's avatar
Tim Schmielau committed
12
13
#include <linux/jiffies.h>
#include <linux/string.h>
Linus Torvalds's avatar
Linus Torvalds committed
14
15

#include <asm/ccwdev.h>
16
#include <asm/cio.h>
17
#include <asm/chpid.h>
Linus Torvalds's avatar
Linus Torvalds committed
18
19
20
21
22
23
24

#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "chsc.h"
#include "ioasm.h"
25
#include "chp.h"
Linus Torvalds's avatar
Linus Torvalds committed
26

27
28
29
30
31
32
33
34
35
36
37
38
39
40
static int timeout_log_enabled;

static int __init ccw_timeout_log_setup(char *unused)
{
	timeout_log_enabled = 1;
	return 1;
}

__setup("ccw_timeout_log", ccw_timeout_log_setup);

static void ccw_timeout_log(struct ccw_device *cdev)
{
	struct schib schib;
	struct subchannel *sch;
41
	struct io_subchannel_private *private;
42
	union orb *orb;
43
44
45
	int cc;

	sch = to_subchannel(cdev->dev.parent);
46
	private = to_io_private(sch);
47
	orb = &private->orb;
48
49
50
51
52
53
	cc = stsch(sch->schid, &schib);

	printk(KERN_WARNING "cio: ccw device timeout occurred at %llx, "
	       "device information:\n", get_clock());
	printk(KERN_WARNING "cio: orb:\n");
	print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
54
		       orb, sizeof(*orb), 0);
55
56
57
58
	printk(KERN_WARNING "cio: ccw device bus id: %s\n",
	       dev_name(&cdev->dev));
	printk(KERN_WARNING "cio: subchannel bus id: %s\n",
	       dev_name(&sch->dev));
59
60
61
	printk(KERN_WARNING "cio: subchannel lpm: %02x, opm: %02x, "
	       "vpm: %02x\n", sch->lpm, sch->opm, sch->vpm);

62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
	if (orb->tm.b) {
		printk(KERN_WARNING "cio: orb indicates transport mode\n");
		printk(KERN_WARNING "cio: last tcw:\n");
		print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
			       (void *)(addr_t)orb->tm.tcw,
			       sizeof(struct tcw), 0);
	} else {
		printk(KERN_WARNING "cio: orb indicates command mode\n");
		if ((void *)(addr_t)orb->cmd.cpa == &private->sense_ccw ||
		    (void *)(addr_t)orb->cmd.cpa == cdev->private->iccws)
			printk(KERN_WARNING "cio: last channel program "
			       "(intern):\n");
		else
			printk(KERN_WARNING "cio: last channel program:\n");

		print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
			       (void *)(addr_t)orb->cmd.cpa,
			       sizeof(struct ccw1), 0);
	}
81
82
83
84
85
86
87
88
89
90
91
	printk(KERN_WARNING "cio: ccw device state: %d\n",
	       cdev->private->state);
	printk(KERN_WARNING "cio: store subchannel returned: cc=%d\n", cc);
	printk(KERN_WARNING "cio: schib:\n");
	print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
		       &schib, sizeof(schib), 0);
	printk(KERN_WARNING "cio: ccw device flags:\n");
	print_hex_dump(KERN_WARNING, "cio:  ", DUMP_PREFIX_NONE, 16, 1,
		       &cdev->private->flags, sizeof(cdev->private->flags), 0);
}

Linus Torvalds's avatar
Linus Torvalds committed
92
93
94
95
96
97
98
99
100
101
/*
 * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
 */
static void
ccw_device_timeout(unsigned long data)
{
	struct ccw_device *cdev;

	cdev = (struct ccw_device *) data;
	spin_lock_irq(cdev->ccwlock);
102
103
	if (timeout_log_enabled)
		ccw_timeout_log(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
	dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
	spin_unlock_irq(cdev->ccwlock);
}

/*
 * Set timeout
 */
void
ccw_device_set_timeout(struct ccw_device *cdev, int expires)
{
	if (expires == 0) {
		del_timer(&cdev->private->timer);
		return;
	}
	if (timer_pending(&cdev->private->timer)) {
		if (mod_timer(&cdev->private->timer, jiffies + expires))
			return;
	}
	cdev->private->timer.function = ccw_device_timeout;
	cdev->private->timer.data = (unsigned long) cdev;
	cdev->private->timer.expires = jiffies + expires;
	add_timer(&cdev->private->timer);
}

/*
 * Cancel running i/o. This is called repeatedly since halt/clear are
 * asynchronous operations. We do one try with cio_cancel, two tries
 * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 * Returns 0 if device now idle, -ENODEV for device not operational and
 * -EBUSY if an interrupt is expected (either from halt/clear or from a
 * status pending).
 */
int
ccw_device_cancel_halt_clear(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	sch = to_subchannel(cdev->dev.parent);
143
	if (cio_update_schib(sch))
Linus Torvalds's avatar
Linus Torvalds committed
144
		return -ENODEV; 
145
146
	if (!sch->schib.pmcw.ena)
		/* Not operational -> done. */
Linus Torvalds's avatar
Linus Torvalds committed
147
148
		return 0;
	/* Stage 1: cancel io. */
149
150
	if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_HALT_PEND) &&
	    !(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
151
152
153
154
155
156
157
		if (!scsw_is_tm(&sch->schib.scsw)) {
			ret = cio_cancel(sch);
			if (ret != -EINVAL)
				return ret;
		}
		/* cancel io unsuccessful or not applicable (transport mode).
		 * Continue with asynchronous instructions. */
Linus Torvalds's avatar
Linus Torvalds committed
158
159
		cdev->private->iretry = 3;	/* 3 halt retries. */
	}
160
	if (!(scsw_actl(&sch->schib.scsw) & SCSW_ACTL_CLEAR_PEND)) {
Linus Torvalds's avatar
Linus Torvalds committed
161
162
163
164
		/* Stage 2: halt io. */
		if (cdev->private->iretry) {
			cdev->private->iretry--;
			ret = cio_halt(sch);
165
166
			if (ret != -EBUSY)
				return (ret == 0) ? -EBUSY : ret;
Linus Torvalds's avatar
Linus Torvalds committed
167
168
169
170
171
172
173
174
175
176
177
178
179
		}
		/* halt io unsuccessful. */
		cdev->private->iretry = 255;	/* 255 clear retries. */
	}
	/* Stage 3: clear io. */
	if (cdev->private->iretry) {
		cdev->private->iretry--;
		ret = cio_clear (sch);
		return (ret == 0) ? -EBUSY : ret;
	}
	panic("Can't stop i/o on subchannel.\n");
}

180
void ccw_device_update_sense_data(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
181
{
182
183
184
185
186
187
	memset(&cdev->id, 0, sizeof(cdev->id));
	cdev->id.cu_type   = cdev->private->senseid.cu_type;
	cdev->id.cu_model  = cdev->private->senseid.cu_model;
	cdev->id.dev_type  = cdev->private->senseid.dev_type;
	cdev->id.dev_model = cdev->private->senseid.dev_model;
}
Linus Torvalds's avatar
Linus Torvalds committed
188

189
190
191
192
193
194
int ccw_device_test_sense_data(struct ccw_device *cdev)
{
	return cdev->id.cu_type == cdev->private->senseid.cu_type &&
		cdev->id.cu_model == cdev->private->senseid.cu_model &&
		cdev->id.dev_type == cdev->private->senseid.dev_type &&
		cdev->id.dev_model == cdev->private->senseid.dev_model;
Linus Torvalds's avatar
Linus Torvalds committed
195
196
197
198
199
200
201
}

/*
 * The machine won't give us any notification by machine check if a chpid has
 * been varied online on the SE so we have to find out by magic (i. e. driving
 * the channel subsystem to device selection and updating our path masks).
 */
202
static void
Linus Torvalds's avatar
Linus Torvalds committed
203
204
205
__recover_lost_chpids(struct subchannel *sch, int old_lpm)
{
	int mask, i;
206
	struct chp_id chpid;
Linus Torvalds's avatar
Linus Torvalds committed
207

208
	chp_id_init(&chpid);
Linus Torvalds's avatar
Linus Torvalds committed
209
210
211
212
213
214
	for (i = 0; i<8; i++) {
		mask = 0x80 >> i;
		if (!(sch->lpm & mask))
			continue;
		if (old_lpm & mask)
			continue;
215
		chpid.id = sch->schib.pmcw.chpid[i];
216
217
		if (!chp_is_registered(chpid))
			css_schedule_eval_all();
Linus Torvalds's avatar
Linus Torvalds committed
218
219
220
221
222
223
224
225
226
227
	}
}

/*
 * Stop device recognition.
 */
static void
ccw_device_recog_done(struct ccw_device *cdev, int state)
{
	struct subchannel *sch;
228
	int old_lpm;
Linus Torvalds's avatar
Linus Torvalds committed
229
230
231
232
233
234
235
236
237
238

	sch = to_subchannel(cdev->dev.parent);

	ccw_device_set_timeout(cdev, 0);
	cio_disable_subchannel(sch);
	/*
	 * Now that we tried recognition, we have performed device selection
	 * through ssch() and the path information is up to date.
	 */
	old_lpm = sch->lpm;
239

240
	/* Check since device may again have become not operational. */
241
	if (cio_update_schib(sch))
242
		state = DEV_STATE_NOT_OPER;
243
244
245
	else
		sch->lpm = sch->schib.pmcw.pam & sch->opm;

Linus Torvalds's avatar
Linus Torvalds committed
246
247
248
249
250
	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
		/* Force reprobe on all chpids. */
		old_lpm = 0;
	if (sch->lpm != old_lpm)
		__recover_lost_chpids(sch, old_lpm);
251
252
253
254
255
256
	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
	    (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
		cdev->private->flags.recog_done = 1;
		cdev->private->state = DEV_STATE_DISCONNECTED;
		wake_up(&cdev->private->wait_q);
		return;
Linus Torvalds's avatar
Linus Torvalds committed
257
	}
258
259
260
261
262
263
	if (cdev->private->flags.resuming) {
		cdev->private->state = state;
		cdev->private->flags.recog_done = 1;
		wake_up(&cdev->private->wait_q);
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
264
265
	switch (state) {
	case DEV_STATE_NOT_OPER:
266
267
268
269
		CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
			      "subchannel 0.%x.%04x\n",
			      cdev->private->dev_id.devno,
			      sch->schid.ssid, sch->schid.sch_no);
Linus Torvalds's avatar
Linus Torvalds committed
270
271
		break;
	case DEV_STATE_OFFLINE:
272
273
274
275
276
277
278
279
280
281
282
		if (!cdev->online) {
			ccw_device_update_sense_data(cdev);
			/* Issue device info message. */
			CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
				      "CU  Type/Mod = %04X/%02X, Dev Type/Mod "
				      "= %04X/%02X\n",
				      cdev->private->dev_id.ssid,
				      cdev->private->dev_id.devno,
				      cdev->id.cu_type, cdev->id.cu_model,
				      cdev->id.dev_type, cdev->id.dev_model);
			break;
Linus Torvalds's avatar
Linus Torvalds committed
283
		}
284
285
286
287
288
289
290
291
292
293
294
		cdev->private->state = DEV_STATE_OFFLINE;
		cdev->private->flags.recog_done = 1;
		if (ccw_device_test_sense_data(cdev)) {
			cdev->private->flags.donotify = 1;
			ccw_device_online(cdev);
			wake_up(&cdev->private->wait_q);
		} else {
			ccw_device_update_sense_data(cdev);
			PREPARE_WORK(&cdev->private->kick_work,
				     ccw_device_do_unbind_bind);
			queue_work(ccw_device_work, &cdev->private->kick_work);
Linus Torvalds's avatar
Linus Torvalds committed
295
		}
296
		return;
Linus Torvalds's avatar
Linus Torvalds committed
297
	case DEV_STATE_BOXED:
298
299
300
301
		CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
			      " subchannel 0.%x.%04x\n",
			      cdev->private->dev_id.devno,
			      sch->schid.ssid, sch->schid.sch_no);
302
303
304
305
306
307
		if (cdev->id.cu_type != 0) { /* device was recognized before */
			cdev->private->flags.recog_done = 1;
			cdev->private->state = DEV_STATE_BOXED;
			wake_up(&cdev->private->wait_q);
			return;
		}
Linus Torvalds's avatar
Linus Torvalds committed
308
309
310
311
		break;
	}
	cdev->private->state = state;
	io_subchannel_recog_done(cdev);
312
	wake_up(&cdev->private->wait_q);
Linus Torvalds's avatar
Linus Torvalds committed
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
}

/*
 * Function called from device_id.c after sense id has completed.
 */
void
ccw_device_sense_id_done(struct ccw_device *cdev, int err)
{
	switch (err) {
	case 0:
		ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
		break;
	case -ETIME:		/* Sense id stopped by timeout. */
		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
		break;
	default:
		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
		break;
	}
}

Cornelia Huck's avatar
Cornelia Huck committed
334
335
336
337
338
339
int ccw_device_notify(struct ccw_device *cdev, int event)
{
	if (!cdev->drv)
		return 0;
	if (!cdev->online)
		return 0;
340
341
342
	CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n",
		      cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
		      event);
Cornelia Huck's avatar
Cornelia Huck committed
343
344
345
	return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
}

346
static void cmf_reenable_delayed(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
347
{
348
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
349
350
	struct ccw_device *cdev;

351
352
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
353
354
355
356
357
358
	cmf_reenable(cdev);
}

static void ccw_device_oper_notify(struct ccw_device *cdev)
{
	if (ccw_device_notify(cdev, CIO_OPER)) {
359
		/* Reenable channel measurements, if needed. */
360
361
362
363
364
365
		PREPARE_WORK(&cdev->private->kick_work, cmf_reenable_delayed);
		queue_work(ccw_device_work, &cdev->private->kick_work);
		return;
	}
	/* Driver doesn't want device back. */
	ccw_device_set_notoper(cdev);
366
	PREPARE_WORK(&cdev->private->kick_work, ccw_device_do_unbind_bind);
367
	queue_work(ccw_device_work, &cdev->private->kick_work);
Linus Torvalds's avatar
Linus Torvalds committed
368
369
370
371
372
373
374
375
376
377
378
379
}

/*
 * Finished with online/offline processing.
 */
static void
ccw_device_done(struct ccw_device *cdev, int state)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);

380
381
	ccw_device_set_timeout(cdev, 0);

Linus Torvalds's avatar
Linus Torvalds committed
382
383
384
385
386
387
388
389
	if (state != DEV_STATE_ONLINE)
		cio_disable_subchannel(sch);

	/* Reset device status. */
	memset(&cdev->private->irb, 0, sizeof(struct irb));

	cdev->private->state = state;

390
	if (state == DEV_STATE_BOXED) {
391
392
		CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
			      cdev->private->dev_id.devno, sch->schid.sch_no);
393
394
395
396
		if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED))
			ccw_device_schedule_sch_unregister(cdev);
		cdev->private->flags.donotify = 0;
	}
397
398
399
400
401
402
403
	if (state == DEV_STATE_NOT_OPER) {
		CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n",
			      cdev->private->dev_id.devno, sch->schid.sch_no);
		if (!ccw_device_notify(cdev, CIO_GONE))
			ccw_device_schedule_sch_unregister(cdev);
		cdev->private->flags.donotify = 0;
	}
Linus Torvalds's avatar
Linus Torvalds committed
404
405
406

	if (cdev->private->flags.donotify) {
		cdev->private->flags.donotify = 0;
407
		ccw_device_oper_notify(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
408
409
410
411
	}
	wake_up(&cdev->private->wait_q);
}

412
static int cmp_pgid(struct pgid *p1, struct pgid *p2)
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
{
	char *c1;
	char *c2;

	c1 = (char *)p1;
	c2 = (char *)p2;

	return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
}

static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
{
	int i;
	int last;

	last = 0;
	for (i = 0; i < 8; i++) {
		if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
			/* No PGID yet */
			continue;
		if (cdev->private->pgid[last].inf.ps.state1 ==
		    SNID_STATE1_RESET) {
			/* First non-zero PGID */
			last = i;
			continue;
		}
		if (cmp_pgid(&cdev->private->pgid[i],
			     &cdev->private->pgid[last]) == 0)
			/* Non-conflicting PGIDs */
			continue;

		/* PGID mismatch, can't pathgroup. */
		CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
			      "0.%x.%04x, can't pathgroup\n",
447
448
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
449
450
451
452
453
454
		cdev->private->options.pgroup = 0;
		return;
	}
	if (cdev->private->pgid[last].inf.ps.state1 ==
	    SNID_STATE1_RESET)
		/* No previous pgid found */
455
456
		memcpy(&cdev->private->pgid[0],
		       &channel_subsystems[0]->global_pgid,
457
458
459
460
461
462
463
		       sizeof(struct pgid));
	else
		/* Use existing pgid */
		memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
		       sizeof(struct pgid));
}

Linus Torvalds's avatar
Linus Torvalds committed
464
465
466
467
468
469
470
471
472
473
/*
 * Function called from device_pgid.c after sense path ground has completed.
 */
void
ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	switch (err) {
474
475
476
477
478
479
480
	case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
		cdev->private->options.pgroup = 0;
		break;
	case 0: /* success */
	case -EACCES: /* partial success, some paths not operational */
		/* Check if all pgids are equal or 0. */
		__ccw_device_get_common_pgid(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
481
482
483
484
		break;
	case -ETIME:		/* Sense path group id stopped by timeout. */
	case -EUSERS:		/* device is reserved for someone else. */
		ccw_device_done(cdev, DEV_STATE_BOXED);
485
		return;
Linus Torvalds's avatar
Linus Torvalds committed
486
487
	default:
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
488
		return;
Linus Torvalds's avatar
Linus Torvalds committed
489
	}
490
491
	/* Start Path Group verification. */
	cdev->private->state = DEV_STATE_VERIFY;
492
	cdev->private->flags.doverify = 0;
493
	ccw_device_verify_start(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
494
495
496
497
498
499
500
501
502
503
504
505
}

/*
 * Start device recognition.
 */
int
ccw_device_recognition(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	sch = to_subchannel(cdev->dev.parent);
506
	ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
Linus Torvalds's avatar
Linus Torvalds committed
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
	if (ret != 0)
		/* Couldn't enable the subchannel for i/o. Sick device. */
		return ret;

	/* After 60s the device recognition is considered to have failed. */
	ccw_device_set_timeout(cdev, 60*HZ);

	/*
	 * We used to start here with a sense pgid to find out whether a device
	 * is locked by someone else. Unfortunately, the sense pgid command
	 * code has other meanings on devices predating the path grouping
	 * algorithm, so we start with sense id and box the device after an
	 * timeout (or if sense pgid during path verification detects the device
	 * is locked, as may happen on newer devices).
	 */
	cdev->private->flags.recog_done = 0;
	cdev->private->state = DEV_STATE_SENSE_ID;
	ccw_device_sense_id_start(cdev);
	return 0;
}

/*
 * Handle timeout in device recognition.
 */
static void
ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		ccw_device_recog_done(cdev, DEV_STATE_BOXED);
		break;
	case -ENODEV:
		ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
		break;
	default:
		ccw_device_set_timeout(cdev, 3*HZ);
	}
}


void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
553
554
555
556
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	/* Update schib - pom may have changed. */
557
558
559
560
561
	if (cio_update_schib(sch)) {
		cdev->private->flags.donotify = 0;
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		return;
	}
562
563
564
565
566
567
568
569
	/* Update lpm with verified path mask. */
	sch->lpm = sch->vpm;
	/* Repeat path verification? */
	if (cdev->private->flags.doverify) {
		cdev->private->flags.doverify = 0;
		ccw_device_verify_start(cdev);
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
570
571
572
573
574
575
576
577
	switch (err) {
	case -EOPNOTSUPP: /* path grouping not supported, just set online. */
		cdev->private->options.pgroup = 0;
	case 0:
		ccw_device_done(cdev, DEV_STATE_ONLINE);
		/* Deliver fake irb to device driver, if needed. */
		if (cdev->private->flags.fake_irb) {
			memset(&cdev->private->irb, 0, sizeof(struct irb));
578
579
580
581
582
			cdev->private->irb.scsw.cmd.cc = 1;
			cdev->private->irb.scsw.cmd.fctl = SCSW_FCTL_START_FUNC;
			cdev->private->irb.scsw.cmd.actl = SCSW_ACTL_START_PEND;
			cdev->private->irb.scsw.cmd.stctl =
				SCSW_STCTL_STATUS_PEND;
Linus Torvalds's avatar
Linus Torvalds committed
583
584
585
586
587
588
589
590
			cdev->private->flags.fake_irb = 0;
			if (cdev->handler)
				cdev->handler(cdev, cdev->private->intparm,
					      &cdev->private->irb);
			memset(&cdev->private->irb, 0, sizeof(struct irb));
		}
		break;
	case -ETIME:
591
592
		/* Reset oper notify indication after verify error. */
		cdev->private->flags.donotify = 0;
Linus Torvalds's avatar
Linus Torvalds committed
593
594
595
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	default:
596
597
		/* Reset oper notify indication after verify error. */
		cdev->private->flags.donotify = 0;
598
599
		if (cdev->online) {
			ccw_device_set_timeout(cdev, 0);
600
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
601
		} else
602
			ccw_device_done(cdev, DEV_STATE_NOT_OPER);
Linus Torvalds's avatar
Linus Torvalds committed
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
		break;
	}
}

/*
 * Get device online.
 */
int
ccw_device_online(struct ccw_device *cdev)
{
	struct subchannel *sch;
	int ret;

	if ((cdev->private->state != DEV_STATE_OFFLINE) &&
	    (cdev->private->state != DEV_STATE_BOXED))
		return -EINVAL;
	sch = to_subchannel(cdev->dev.parent);
620
	ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
Linus Torvalds's avatar
Linus Torvalds committed
621
622
623
624
625
626
627
628
	if (ret != 0) {
		/* Couldn't enable the subchannel for i/o. Sick device. */
		if (ret == -ENODEV)
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
		return ret;
	}
	/* Do we want to do path grouping? */
	if (!cdev->private->options.pgroup) {
629
630
		/* Start initial path verification. */
		cdev->private->state = DEV_STATE_VERIFY;
631
		cdev->private->flags.doverify = 0;
632
		ccw_device_verify_start(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
		return 0;
	}
	/* Do a SensePGID first. */
	cdev->private->state = DEV_STATE_SENSE_PGID;
	ccw_device_sense_pgid_start(cdev);
	return 0;
}

void
ccw_device_disband_done(struct ccw_device *cdev, int err)
{
	switch (err) {
	case 0:
		ccw_device_done(cdev, DEV_STATE_OFFLINE);
		break;
	case -ETIME:
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	default:
652
		cdev->private->flags.donotify = 0;
653
		dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
Linus Torvalds's avatar
Linus Torvalds committed
654
655
656
657
658
659
660
661
662
663
664
665
666
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		break;
	}
}

/*
 * Shutdown device.
 */
int
ccw_device_offline(struct ccw_device *cdev)
{
	struct subchannel *sch;

667
668
669
670
671
672
673
	/* Allow ccw_device_offline while disconnected. */
	if (cdev->private->state == DEV_STATE_DISCONNECTED ||
	    cdev->private->state == DEV_STATE_NOT_OPER) {
		cdev->private->flags.donotify = 0;
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		return 0;
	}
674
675
676
677
	if (ccw_device_is_orphan(cdev)) {
		ccw_device_done(cdev, DEV_STATE_OFFLINE);
		return 0;
	}
Linus Torvalds's avatar
Linus Torvalds committed
678
	sch = to_subchannel(cdev->dev.parent);
679
	if (cio_update_schib(sch))
Linus Torvalds's avatar
Linus Torvalds committed
680
		return -ENODEV;
681
	if (scsw_actl(&sch->schib.scsw) != 0)
Linus Torvalds's avatar
Linus Torvalds committed
682
		return -EBUSY;
683
684
	if (cdev->private->state != DEV_STATE_ONLINE)
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
	/* Are we doing path grouping? */
	if (!cdev->private->options.pgroup) {
		/* No, set state offline immediately. */
		ccw_device_done(cdev, DEV_STATE_OFFLINE);
		return 0;
	}
	/* Start Set Path Group commands. */
	cdev->private->state = DEV_STATE_DISBAND_PGID;
	ccw_device_disband_start(cdev);
	return 0;
}

/*
 * Handle timeout in device online/offline process.
 */
static void
ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		ccw_device_done(cdev, DEV_STATE_BOXED);
		break;
	case -ENODEV:
		ccw_device_done(cdev, DEV_STATE_NOT_OPER);
		break;
	default:
		ccw_device_set_timeout(cdev, 3*HZ);
	}
}

/*
 * Handle not oper event in device recognition.
 */
static void
ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
{
	ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
}

/*
728
 * Handle not operational event in non-special state.
Linus Torvalds's avatar
Linus Torvalds committed
729
 */
730
731
static void ccw_device_generic_notoper(struct ccw_device *cdev,
				       enum dev_event dev_event)
Linus Torvalds's avatar
Linus Torvalds committed
732
733
734
{
	struct subchannel *sch;

735
	ccw_device_set_notoper(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
736
	sch = to_subchannel(cdev->dev.parent);
737
	css_schedule_eval(sch->schid);
Linus Torvalds's avatar
Linus Torvalds committed
738
739
}

740
741
742
743
744
745
746
747
748
749
750
/*
 * Handle path verification event in offline state.
 */
static void ccw_device_offline_verify(struct ccw_device *cdev,
				      enum dev_event dev_event)
{
	struct subchannel *sch = to_subchannel(cdev->dev.parent);

	css_schedule_eval(sch->schid);
}

Linus Torvalds's avatar
Linus Torvalds committed
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
/*
 * Handle path verification event.
 */
static void
ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	if (cdev->private->state == DEV_STATE_W4SENSE) {
		cdev->private->flags.doverify = 1;
		return;
	}
	sch = to_subchannel(cdev->dev.parent);
	/*
	 * Since we might not just be coming from an interrupt from the
	 * subchannel we have to update the schib.
	 */
768
769
770
771
	if (cio_update_schib(sch)) {
		ccw_device_verify_done(cdev, -ENODEV);
		return;
	}
Linus Torvalds's avatar
Linus Torvalds committed
772

773
774
775
	if (scsw_actl(&sch->schib.scsw) != 0 ||
	    (scsw_stctl(&sch->schib.scsw) & SCSW_STCTL_STATUS_PEND) ||
	    (scsw_stctl(&cdev->private->irb.scsw) & SCSW_STCTL_STATUS_PEND)) {
Linus Torvalds's avatar
Linus Torvalds committed
776
777
778
779
780
781
782
783
784
785
		/*
		 * No final status yet or final status not yet delivered
		 * to the device driver. Can't do path verfication now,
		 * delay until final status was delivered.
		 */
		cdev->private->flags.doverify = 1;
		return;
	}
	/* Device is idle, we can do the path verification. */
	cdev->private->state = DEV_STATE_VERIFY;
786
	cdev->private->flags.doverify = 0;
Linus Torvalds's avatar
Linus Torvalds committed
787
788
789
790
791
792
793
794
795
796
	ccw_device_verify_start(cdev);
}

/*
 * Got an interrupt for a normal io (state online).
 */
static void
ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;
797
	int is_cmd;
Linus Torvalds's avatar
Linus Torvalds committed
798
799

	irb = (struct irb *) __LC_IRB;
800
	is_cmd = !scsw_is_tm(&irb->scsw);
Linus Torvalds's avatar
Linus Torvalds committed
801
	/* Check for unsolicited interrupt. */
802
	if (!scsw_is_solicited(&irb->scsw)) {
803
		if (is_cmd && (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
Linus Torvalds's avatar
Linus Torvalds committed
804
805
806
807
		    !irb->esw.esw0.erw.cons) {
			/* Unit check but no sense data. Need basic sense. */
			if (ccw_device_do_sense(cdev, irb) != 0)
				goto call_handler_unsol;
808
			memcpy(&cdev->private->irb, irb, sizeof(struct irb));
Linus Torvalds's avatar
Linus Torvalds committed
809
810
811
812
813
814
815
			cdev->private->state = DEV_STATE_W4SENSE;
			cdev->private->intparm = 0;
			return;
		}
call_handler_unsol:
		if (cdev->handler)
			cdev->handler (cdev, 0, irb);
816
817
		if (cdev->private->flags.doverify)
			ccw_device_online_verify(cdev, 0);
Linus Torvalds's avatar
Linus Torvalds committed
818
819
820
821
		return;
	}
	/* Accumulate status and find out if a basic sense is needed. */
	ccw_device_accumulate_irb(cdev, irb);
822
	if (is_cmd && cdev->private->flags.dosense) {
Linus Torvalds's avatar
Linus Torvalds committed
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
		if (ccw_device_do_sense(cdev, irb) == 0) {
			cdev->private->state = DEV_STATE_W4SENSE;
		}
		return;
	}
	/* Call the handler. */
	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

/*
 * Got an timeout in online state.
 */
static void
ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ccw_device_set_timeout(cdev, 0);
	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
		return;
	}
849
850
851
	if (ret == -ENODEV)
		dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
	else if (cdev->handler)
Linus Torvalds's avatar
Linus Torvalds committed
852
853
854
855
856
857
858
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-ETIMEDOUT));
}

/*
 * Got an interrupt for a basic sense.
 */
859
static void
Linus Torvalds's avatar
Linus Torvalds committed
860
861
862
863
864
865
ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	irb = (struct irb *) __LC_IRB;
	/* Check for unsolicited interrupt. */
866
867
868
	if (scsw_stctl(&irb->scsw) ==
	    (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
		if (scsw_cc(&irb->scsw) == 1)
Linus Torvalds's avatar
Linus Torvalds committed
869
870
871
			/* Basic sense hasn't started. Try again. */
			ccw_device_do_sense(cdev, irb);
		else {
872
			CIO_MSG_EVENT(0, "0.%x.%04x: unsolicited "
Cornelia Huck's avatar
Cornelia Huck committed
873
874
875
				      "interrupt during w4sense...\n",
				      cdev->private->dev_id.ssid,
				      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
876
877
878
879
880
			if (cdev->handler)
				cdev->handler (cdev, 0, irb);
		}
		return;
	}
881
882
883
884
885
	/*
	 * Check if a halt or clear has been issued in the meanwhile. If yes,
	 * only deliver the halt/clear interrupt to the device driver as if it
	 * had killed the original request.
	 */
886
887
	if (scsw_fctl(&irb->scsw) &
	    (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
888
889
890
891
892
893
		/* Retry Basic Sense if requested. */
		if (cdev->private->flags.intretry) {
			cdev->private->flags.intretry = 0;
			ccw_device_do_sense(cdev, irb);
			return;
		}
894
895
896
897
898
		cdev->private->flags.dosense = 0;
		memset(&cdev->private->irb, 0, sizeof(struct irb));
		ccw_device_accumulate_irb(cdev, irb);
		goto call_handler;
	}
Linus Torvalds's avatar
Linus Torvalds committed
899
900
901
902
903
904
905
	/* Add basic sense info to irb. */
	ccw_device_accumulate_basic_sense(cdev, irb);
	if (cdev->private->flags.dosense) {
		/* Another basic sense is needed. */
		ccw_device_do_sense(cdev, irb);
		return;
	}
906
call_handler:
Linus Torvalds's avatar
Linus Torvalds committed
907
	cdev->private->state = DEV_STATE_ONLINE;
908
909
	/* In case sensing interfered with setting the device online */
	wake_up(&cdev->private->wait_q);
Linus Torvalds's avatar
Linus Torvalds committed
910
911
912
913
914
915
916
917
918
919
920
921
922
923
	/* Call the handler. */
	if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
		/* Start delayed path verification. */
		ccw_device_online_verify(cdev, 0);
}

static void
ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	irb = (struct irb *) __LC_IRB;
	/* Accumulate status. We don't do basic sense. */
	ccw_device_accumulate_irb(cdev, irb);
Cornelia Huck's avatar
Cornelia Huck committed
924
925
	/* Remember to clear irb to avoid residuals. */
	memset(&cdev->private->irb, 0, sizeof(struct irb));
Linus Torvalds's avatar
Linus Torvalds committed
926
927
928
929
930
931
932
933
934
935
936
937
	/* Try to start delayed device verification. */
	ccw_device_online_verify(cdev, 0);
	/* Note: Don't call handler for cio initiated clear! */
}

static void
ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	ccw_device_set_timeout(cdev, 0);
938
939
	/* Start delayed path verification. */
	ccw_device_online_verify(cdev, 0);
Linus Torvalds's avatar
Linus Torvalds committed
940
941
942
	/* OK, i/o is dead now. Call interrupt handler. */
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
943
			      ERR_PTR(-EIO));
Linus Torvalds's avatar
Linus Torvalds committed
944
945
946
947
948
949
950
951
952
953
954
955
}

static void
ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		return;
	}
956
957
	/* Start delayed path verification. */
	ccw_device_online_verify(cdev, 0);
Linus Torvalds's avatar
Linus Torvalds committed
958
959
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
960
			      ERR_PTR(-EIO));
Linus Torvalds's avatar
Linus Torvalds committed
961
962
}

Cornelia Huck's avatar
Cornelia Huck committed
963
void ccw_device_kill_io(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
964
965
966
967
968
969
970
971
972
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	if (ret == -EBUSY) {
		ccw_device_set_timeout(cdev, 3*HZ);
		cdev->private->state = DEV_STATE_TIMEOUT_KILL;
		return;
	}
973
974
	/* Start delayed path verification. */
	ccw_device_online_verify(cdev, 0);
Linus Torvalds's avatar
Linus Torvalds committed
975
976
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
977
			      ERR_PTR(-EIO));
Linus Torvalds's avatar
Linus Torvalds committed
978
979
980
}

static void
981
ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
Linus Torvalds's avatar
Linus Torvalds committed
982
{
983
	/* Start verification after current task finished. */
984
	cdev->private->flags.doverify = 1;
Linus Torvalds's avatar
Linus Torvalds committed
985
986
987
988
989
990
991
992
993
994
995
}

static void
ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct irb *irb;

	switch (dev_event) {
	case DEV_EVENT_INTERRUPT:
		irb = (struct irb *) __LC_IRB;
		/* Check for unsolicited interrupt. */
996
		if ((scsw_stctl(&irb->scsw) ==
Linus Torvalds's avatar
Linus Torvalds committed
997
		     (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
998
		    (!scsw_cc(&irb->scsw)))
Linus Torvalds's avatar
Linus Torvalds committed
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
			/* FIXME: we should restart stlck here, but this
			 * is extremely unlikely ... */
			goto out_wakeup;

		ccw_device_accumulate_irb(cdev, irb);
		/* We don't care about basic sense etc. */
		break;
	default: /* timeout */
		break;
	}
out_wakeup:
	wake_up(&cdev->private->wait_q);
}

static void
ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
1019
	if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
Linus Torvalds's avatar
Linus Torvalds committed
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
		/* Couldn't enable the subchannel for i/o. Sick device. */
		return;

	/* After 60s the device recognition is considered to have failed. */
	ccw_device_set_timeout(cdev, 60*HZ);

	cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
	ccw_device_sense_id_start(cdev);
}

Cornelia Huck's avatar
Cornelia Huck committed
1030
void ccw_device_trigger_reprobe(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
1031
{
Cornelia Huck's avatar
Cornelia Huck committed
1032
	struct subchannel *sch;
Linus Torvalds's avatar
Linus Torvalds committed
1033
1034
1035
1036

	if (cdev->private->state != DEV_STATE_DISCONNECTED)
		return;

Cornelia Huck's avatar
Cornelia Huck committed
1037
	sch = to_subchannel(cdev->dev.parent);
Linus Torvalds's avatar
Linus Torvalds committed
1038
	/* Update some values. */
1039
	if (cio_update_schib(sch))
1040
		return;
Linus Torvalds's avatar
Linus Torvalds committed
1041
1042
1043
1044
	/*
	 * The pim, pam, pom values may not be accurate, but they are the best
	 * we have before performing device selection :/
	 */
1045
	sch->lpm = sch->schib.pmcw.pam & sch->opm;
1046
1047
1048
1049
1050
	/*
	 * Use the initial configuration since we can't be shure that the old
	 * paths are valid.
	 */
	io_subchannel_init_config(sch);
1051
1052
	if (cio_commit_config(sch))
		return;
1053

Linus Torvalds's avatar
Linus Torvalds committed
1054
	/* We should also udate ssd info, but this has to wait. */
1055
1056
1057
1058
	/* Check if this is another device which appeared on the same sch. */
	if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_move_to_orphanage);
1059
		queue_work(slow_path_wq, &cdev->private->kick_work);
1060
1061
	} else
		ccw_device_start_id(cdev, 0);
Linus Torvalds's avatar
Linus Torvalds committed
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
}

static void
ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
{
	struct subchannel *sch;

	sch = to_subchannel(cdev->dev.parent);
	/*
	 * An interrupt in state offline means a previous disable was not
1072
	 * successful - should not happen, but we try to disable again.
Linus Torvalds's avatar
Linus Torvalds committed
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
	 */
	cio_disable_subchannel(sch);
}

static void
ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
{
	retry_set_schib(cdev);
	cdev->private->state = DEV_STATE_ONLINE;
	dev_fsm_event(cdev, dev_event);
}

1085
1086
1087
1088
1089
1090
1091
static void ccw_device_update_cmfblock(struct ccw_device *cdev,
				       enum dev_event dev_event)
{
	cmf_retry_copy_block(cdev);
	cdev->private->state = DEV_STATE_ONLINE;
	dev_fsm_event(cdev, dev_event);
}
Linus Torvalds's avatar
Linus Torvalds committed
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138

static void
ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
{
	ccw_device_set_timeout(cdev, 0);
	if (dev_event == DEV_EVENT_NOTOPER)
		cdev->private->state = DEV_STATE_NOT_OPER;
	else
		cdev->private->state = DEV_STATE_OFFLINE;
	wake_up(&cdev->private->wait_q);
}

static void
ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
{
	int ret;

	ret = ccw_device_cancel_halt_clear(cdev);
	switch (ret) {
	case 0:
		cdev->private->state = DEV_STATE_OFFLINE;
		wake_up(&cdev->private->wait_q);
		break;
	case -ENODEV:
		cdev->private->state = DEV_STATE_NOT_OPER;
		wake_up(&cdev->private->wait_q);
		break;
	default:
		ccw_device_set_timeout(cdev, HZ/10);
	}
}

/*
 * No operation action. This is used e.g. to ignore a timeout event in
 * state offline.
 */
static void
ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
{
}

/*
 * Bug operation action. 
 */
static void
ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
{
1139
1140
1141
1142
	CIO_MSG_EVENT(0, "Internal state [%i][%i] not handled for device "
		      "0.%x.%04x\n", cdev->private->state, dev_event,
		      cdev->private->dev_id.ssid,
		      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
	BUG();
}

/*
 * device statemachine
 */
fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
	[DEV_STATE_NOT_OPER] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
		[DEV_EVENT_INTERRUPT]	= ccw_device_bug,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_SENSE_PGID] = {
1157
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_pgid_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_SENSE_ID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_OFFLINE] = {
1169
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1170
1171
		[DEV_EVENT_INTERRUPT]	= ccw_device_offline_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
1172
		[DEV_EVENT_VERIFY]	= ccw_device_offline_verify,
Linus Torvalds's avatar
Linus Torvalds committed
1173
1174
	},
	[DEV_STATE_VERIFY] = {
1175
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1176
1177
		[DEV_EVENT_INTERRUPT]	= ccw_device_verify_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
1178
		[DEV_EVENT_VERIFY]	= ccw_device_delay_verify,
Linus Torvalds's avatar
Linus Torvalds committed
1179
1180
	},
	[DEV_STATE_ONLINE] = {
1181
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1182
1183
1184
1185
1186
		[DEV_EVENT_INTERRUPT]	= ccw_device_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_online_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
	},
	[DEV_STATE_W4SENSE] = {
1187
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1188
1189
1190
1191
1192
		[DEV_EVENT_INTERRUPT]	= ccw_device_w4sense,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_online_verify,
	},
	[DEV_STATE_DISBAND_PGID] = {
1193
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1194
1195
1196
1197
1198
		[DEV_EVENT_INTERRUPT]	= ccw_device_disband_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_onoff_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_BOXED] = {
1199
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1200
1201
1202
1203
1204
1205
		[DEV_EVENT_INTERRUPT]	= ccw_device_stlck_done,
		[DEV_EVENT_TIMEOUT]	= ccw_device_stlck_done,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	/* states to wait for i/o completion before doing something */
	[DEV_STATE_CLEAR_VERIFY] = {
1206
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1207
1208
1209
1210
1211
		[DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
		[DEV_EVENT_TIMEOUT]	= ccw_device_nop,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_TIMEOUT_KILL] = {
1212
		[DEV_EVENT_NOTOPER]	= ccw_device_generic_notoper,
Linus Torvalds's avatar
Linus Torvalds committed
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
		[DEV_EVENT_INTERRUPT]	= ccw_device_killing_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_killing_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop, //FIXME
	},
	[DEV_STATE_QUIESCE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_quiesce_done,
		[DEV_EVENT_INTERRUPT]	= ccw_device_quiesce_done,
		[DEV_EVENT_TIMEOUT]	= ccw_device_quiesce_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	/* special states for devices gone not operational */
	[DEV_STATE_DISCONNECTED] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_nop,
		[DEV_EVENT_INTERRUPT]	= ccw_device_start_id,
		[DEV_EVENT_TIMEOUT]	= ccw_device_bug,
1228
		[DEV_EVENT_VERIFY]	= ccw_device_start_id,
Linus Torvalds's avatar
Linus Torvalds committed
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
	},
	[DEV_STATE_DISCONNECTED_SENSE_ID] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_recog_notoper,
		[DEV_EVENT_INTERRUPT]	= ccw_device_sense_id_irq,
		[DEV_EVENT_TIMEOUT]	= ccw_device_recog_timeout,
		[DEV_EVENT_VERIFY]	= ccw_device_nop,
	},
	[DEV_STATE_CMFCHANGE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_change_cmfstate,
		[DEV_EVENT_INTERRUPT]	= ccw_device_change_cmfstate,
		[DEV_EVENT_TIMEOUT]	= ccw_device_change_cmfstate,
		[DEV_EVENT_VERIFY]	= ccw_device_change_cmfstate,
	},
1242
1243
1244
1245
1246
1247
	[DEV_STATE_CMFUPDATE] = {
		[DEV_EVENT_NOTOPER]	= ccw_device_update_cmfblock,
		[DEV_EVENT_INTERRUPT]	= ccw_device_update_cmfblock,
		[DEV_EVENT_TIMEOUT]	= ccw_device_update_cmfblock,
		[DEV_EVENT_VERIFY]	= ccw_device_update_cmfblock,
	},
Linus Torvalds's avatar
Linus Torvalds committed
1248
1249
1250
};

EXPORT_SYMBOL_GPL(ccw_device_set_timeout);