aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/cio/chp.c
blob: c268a2e5b7c332901c7225e30afe7872cfbd7bbd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
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
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
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
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
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
728
729
730
731
/*
 *  drivers/s390/cio/chp.c
 *
 *    Copyright IBM Corp. 1999,2007
 *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Arnd Bergmann (arndb@de.ibm.com)
 *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 */

#include <linux/bug.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <asm/chpid.h>
#include <asm/sclp.h>
#include <asm/crw.h>

#include "cio.h"
#include "css.h"
#include "ioasm.h"
#include "cio_debug.h"
#include "chp.h"

#define to_channelpath(device) container_of(device, struct channel_path, dev)
#define CHP_INFO_UPDATE_INTERVAL	1*HZ

enum cfg_task_t {
	cfg_none,
	cfg_configure,
	cfg_deconfigure
};

/* Map for pending configure tasks. */
static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1];
static DEFINE_MUTEX(cfg_lock);
static int cfg_busy;

/* Map for channel-path status. */
static struct sclp_chp_info chp_info;
static DEFINE_MUTEX(info_lock);

/* Time after which channel-path status may be outdated. */
static unsigned long chp_info_expires;

/* Workqueue to perform pending configure tasks. */
static struct workqueue_struct *chp_wq;
static struct work_struct cfg_work;

/* Wait queue for configure completion events. */
static wait_queue_head_t cfg_wait_queue;

/* Return channel_path struct for given chpid. */
static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
{
	return channel_subsystems[chpid.cssid]->chps[chpid.id];
}

/* Set vary state for given chpid. */
static void set_chp_logically_online(struct chp_id chpid, int onoff)
{
	chpid_to_chp(chpid)->state = onoff;
}

/* On success return 0 if channel-path is varied offline, 1 if it is varied
 * online. Return -ENODEV if channel-path is not registered. */
int chp_get_status(struct chp_id chpid)
{
	return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV);
}

/**
 * chp_get_sch_opm - return opm for subchannel
 * @sch: subchannel
 *
 * Calculate and return the operational path mask (opm) based on the chpids
 * used by the subchannel and the status of the associated channel-paths.
 */
u8 chp_get_sch_opm(struct subchannel *sch)
{
	struct chp_id chpid;
	int opm;
	int i;

	opm = 0;
	chp_id_init(&chpid);
	for (i = 0; i < 8; i++) {
		opm <<= 1;
		chpid.id = sch->schib.pmcw.chpid[i];
		if (chp_get_status(chpid) != 0)
			opm |= 1;
	}
	return opm;
}
EXPORT_SYMBOL_GPL(chp_get_sch_opm);

/**
 * chp_is_registered - check if a channel-path is registered
 * @chpid: channel-path ID
 *
 * Return non-zero if a channel-path with the given chpid is registered,
 * zero otherwise.
 */
int chp_is_registered(struct chp_id chpid)
{
	return chpid_to_chp(chpid) != NULL;
}

/*
 * Function: s390_vary_chpid
 * Varies the specified chpid online or offline
 */
static int s390_vary_chpid(struct chp_id chpid, int on)
{
	char dbf_text[15];
	int status;

	sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid,
		chpid.id);
	CIO_TRACE_EVENT(2, dbf_text);

	status = chp_get_status(chpid);
	if (!on && !status)
		return 0;

	set_chp_logically_online(chpid, on);
	chsc_chp_vary(chpid, on);
	return 0;
}

/*
 * Channel measurement related functions
 */
static ssize_t chp_measurement_chars_read(struct kobject *kobj,
					  struct bin_attribute *bin_attr,
					  char *buf, loff_t off, size_t count)
{
	struct channel_path *chp;
	struct device *device;

	device = container_of(kobj, struct device, kobj);
	chp = to_channelpath(device);
	if (!chp->cmg_chars)
		return 0;

	return memory_read_from_buffer(buf, count, &off,
				chp->cmg_chars, sizeof(struct cmg_chars));
}

static struct bin_attribute chp_measurement_chars_attr = {
	.attr = {
		.name = "measurement_chars",
		.mode = S_IRUSR,
	},
	.size = sizeof(struct cmg_chars),
	.read = chp_measurement_chars_read,
};

static void chp_measurement_copy_block(struct cmg_entry *buf,
				       struct channel_subsystem *css,
				       struct chp_id chpid)
{
	void *area;
	struct cmg_entry *entry, reference_buf;
	int idx;

	if (chpid.id < 128) {
		area = css->cub_addr1;
		idx = chpid.id;
	} else {
		area = css->cub_addr2;
		idx = chpid.id - 128;
	}
	entry = area + (idx * sizeof(struct cmg_entry));
	do {
		memcpy(buf, entry, sizeof(*entry));
		memcpy(&reference_buf, entry, sizeof(*entry));
	} while (reference_buf.values[0] != buf->values[0]);
}

static ssize_t chp_measurement_read(struct kobject *kobj,
				    struct bin_attribute *bin_attr,
				    char *buf, loff_t off, size_t count)
{
	struct channel_path *chp;
	struct channel_subsystem *css;
	struct device *device;
	unsigned int size;

	device = container_of(kobj, struct device, kobj);
	chp = to_channelpath(device);
	css = to_css(chp->dev.parent);

	size = sizeof(struct cmg_entry);

	/* Only allow single reads. */
	if (off || count < size)
		return 0;
	chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid);
	count = size;
	return count;
}

static struct bin_attribute chp_measurement_attr = {
	.attr = {
		.name = "measurement",
		.mode = S_IRUSR,
	},
	.size = sizeof(struct cmg_entry),
	.read = chp_measurement_read,
};

void chp_remove_cmg_attr(struct channel_path *chp)
{
	device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
	device_remove_bin_file(&chp->dev, &chp_measurement_attr);
}

int chp_add_cmg_attr(struct channel_path *chp)
{
	int ret;

	ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr);
	if (ret)
		return ret;
	ret = device_create_bin_file(&chp->dev, &chp_measurement_attr);
	if (ret)
		device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr);
	return ret;
}

/*
 * Files for the channel path entries.
 */
static ssize_t chp_status_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct channel_path *chp = to_channelpath(dev);

	if (!chp)
		return 0;
	return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") :
		sprintf(buf, "offline\n"));
}

static ssize_t chp_status_write(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct channel_path *cp = to_channelpath(dev);
	char cmd[10];
	int num_args;
	int error;

	num_args = sscanf(buf, "%5s", cmd);
	if (!num_args)
		return count;

	if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1"))
		error = s390_vary_chpid(cp->chpid, 1);
	else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0"))
		error = s390_vary_chpid(cp->chpid, 0);
	else
		error = -EINVAL;

	return error < 0 ? error : count;

}

static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write);

static ssize_t chp_configure_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct channel_path *cp;
	int status;

	cp = to_channelpath(dev);
	status = chp_info_get_status(cp->chpid);
	if (status < 0)
		return status;

	return snprintf(buf, PAGE_SIZE, "%d\n", status);
}

static int cfg_wait_idle(void);

static ssize_t chp_configure_write(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct channel_path *cp;
	int val;
	char delim;

	if (sscanf(buf, "%d %c", &val, &delim) != 1)
		return -EINVAL;
	if (val != 0 && val != 1)
		return -EINVAL;
	cp = to_channelpath(dev);
	chp_cfg_schedule(cp->chpid, val);
	cfg_wait_idle();

	return count;
}

static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write);

static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct channel_path *chp = to_channelpath(dev);

	if (!chp)
		return 0;
	return sprintf(buf, "%x\n", chp->desc.desc);
}

static DEVICE_ATTR(type, 0444, chp_type_show, NULL);

static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct channel_path *chp = to_channelpath(dev);

	if (!chp)
		return 0;
	if (chp->cmg == -1) /* channel measurements not available */
		return sprintf(buf, "unknown\n");
	return sprintf(buf, "%x\n", chp->cmg);
}

static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL);

static ssize_t chp_shared_show(struct device *dev,
			       struct device_attribute *attr, char *buf)
{
	struct channel_path *chp = to_channelpath(dev);

	if (!chp)
		return 0;
	if (chp->shared == -1) /* channel measurements not available */
		return sprintf(buf, "unknown\n");
	return sprintf(buf, "%x\n", chp->shared);
}

static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL);

static struct attribute *chp_attrs[] = {
	&dev_attr_status.attr,
	&dev_attr_configure.attr,
	&dev_attr_type.attr,
	&dev_attr_cmg.attr,
	&dev_attr_shared.attr,
	NULL,
};

static struct attribute_group chp_attr_group = {
	.attrs = chp_attrs,
};

static void chp_release(struct device *dev)
{
	struct channel_path *cp;

	cp = to_channelpath(dev);
	kfree(cp);
}

/**
 * chp_new - register a new channel-path
 * @chpid - channel-path ID
 *
 * Create and register data structure representing new channel-path. Return
 * zero on success, non-zero otherwise.
 */
int chp_new(struct chp_id chpid)
{
	struct channel_path *chp;
	int ret;

	if (chp_is_registered(chpid))
		return 0;
	chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL);
	if (!chp)
		return -ENOMEM;

	/* fill in status, etc. */
	chp->chpid = chpid;
	chp->state = 1;
	chp->dev.parent = &channel_subsystems[chpid.cssid]->device;
	chp->dev.release = chp_release;

	/* Obtain channel path description and fill it in. */
	ret = chsc_determine_base_channel_path_desc(chpid, &chp->desc);
	if (ret)
		goto out_free;
	if ((chp->desc.flags & 0x80) == 0) {
		ret = -ENODEV;
		goto out_free;
	}
	/* Get channel-measurement characteristics. */
	if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
		ret = chsc_get_channel_measurement_chars(chp);
		if (ret)
			goto out_free;
	} else {
		chp->cmg = -1;
	}
	dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);

	/* make it known to the system */
	ret = device_register(&chp->dev);
	if (ret) {
		CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n",
			      chpid.cssid, chpid.id, ret);
		put_device(&chp->dev);
		goto out;
	}
	ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
	if (ret) {
		device_unregister(&chp->dev);
		goto out;
	}
	mutex_lock(&channel_subsystems[chpid.cssid]->mutex);
	if (channel_subsystems[chpid.cssid]->cm_enabled) {
		ret = chp_add_cmg_attr(chp);
		if (ret) {
			sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
			device_unregister(&chp->dev);
			mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
			goto out;
		}
	}
	channel_subsystems[chpid.cssid]->chps[chpid.id] = chp;
	mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
	goto out;
out_free:
	kfree(chp);
out:
	return ret;
}

/**
 * chp_get_chp_desc - return newly allocated channel-path description
 * @chpid: channel-path ID
 *
 * On success return a newly allocated copy of the channel-path description
 * data associated with the given channel-path ID. Return %NULL on error.
 */
void *chp_get_chp_desc(struct chp_id chpid)
{
	struct channel_path *chp;
	struct channel_path_desc *desc;

	chp = chpid_to_chp(chpid);
	if (!chp)
		return NULL;
	desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL);
	if (!desc)
		return NULL;
	memcpy(desc, &chp->desc, sizeof(struct channel_path_desc));
	return desc;
}

/**
 * chp_process_crw - process channel-path status change
 * @crw0: channel report-word to handler
 * @crw1: second channel-report word (always NULL)
 * @overflow: crw overflow indication
 *
 * Handle channel-report-words indicating that the status of a channel-path
 * has changed.
 */
static void chp_process_crw(struct crw *crw0, struct crw *crw1,
			    int overflow)
{
	struct chp_id chpid;

	if (overflow) {
		css_schedule_eval_all();
		return;
	}
	CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
		      "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
		      crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
		      crw0->erc, crw0->rsid);
	/*
	 * Check for solicited machine checks. These are
	 * created by reset channel path and need not be
	 * handled here.
	 */
	if (crw0->slct) {
		CIO_CRW_EVENT(2, "solicited machine check for "
			      "channel path %02X\n", crw0->rsid);
		return;
	}
	chp_id_init(&chpid);
	chpid.id = crw0->rsid;
	switch (crw0->erc) {
	case CRW_ERC_IPARM: /* Path has come. */
		if (!chp_is_registered(chpid))
			chp_new(chpid);
		chsc_chp_online(chpid);
		break;
	case CRW_ERC_PERRI: /* Path has gone. */
	case CRW_ERC_PERRN:
		chsc_chp_offline(chpid);
		break;
	default:
		CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n",
			      crw0->erc);
	}
}

int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link)
{
	int i;
	int mask;

	for (i = 0; i < 8; i++) {
		mask = 0x80 >> i;
		if (!(ssd->path_mask & mask))
			continue;
		if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid))
			continue;
		if ((ssd->fla_valid_mask & mask) &&
		    ((ssd->fla[i] & link->fla_mask) != link->fla))
			continue;
		return mask;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(chp_ssd_get_mask);

static inline int info_bit_num(struct chp_id id)
{
	return id.id + id.cssid * (__MAX_CHPID + 1);
}

/* Force chp_info refresh on next call to info_validate(). */
static void info_expire(void)
{
	mutex_lock(&info_lock);
	chp_info_expires = jiffies - 1;
	mutex_unlock(&info_lock);
}

/* Ensure that chp_info is up-to-date. */
static int info_update(void)
{
	int rc;

	mutex_lock(&info_lock);
	rc = 0;
	if (time_after(jiffies, chp_info_expires)) {
		/* Data is too old, update. */
		rc = sclp_chp_read_info(&chp_info);
		chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ;
	}
	mutex_unlock(&info_lock);

	return rc;
}

/**
 * chp_info_get_status - retrieve configure status of a channel-path
 * @chpid: channel-path ID
 *
 * On success, return 0 for standby, 1 for configured, 2 for reserved,
 * 3 for not recognized. Return negative error code on error.
 */
int chp_info_get_status(struct chp_id chpid)
{
	int rc;
	int bit;

	rc = info_update();
	if (rc)
		return rc;

	bit = info_bit_num(chpid);
	mutex_lock(&info_lock);
	if (!chp_test_bit(chp_info.recognized, bit))
		rc = CHP_STATUS_NOT_RECOGNIZED;
	else if (chp_test_bit(chp_info.configured, bit))
		rc = CHP_STATUS_CONFIGURED;
	else if (chp_test_bit(chp_info.standby, bit))
		rc = CHP_STATUS_STANDBY;
	else
		rc = CHP_STATUS_RESERVED;
	mutex_unlock(&info_lock);

	return rc;
}

/* Return configure task for chpid. */
static enum cfg_task_t cfg_get_task(struct chp_id chpid)
{
	return chp_cfg_task[chpid.cssid][chpid.id];
}

/* Set configure task for chpid. */
static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg)
{
	chp_cfg_task[chpid.cssid][chpid.id] = cfg;
}

/* Perform one configure/deconfigure request. Reschedule work function until
 * last request. */
static void cfg_func(struct work_struct *work)
{
	struct chp_id chpid;
	enum cfg_task_t t;
	int rc;

	mutex_lock(&cfg_lock);
	t = cfg_none;
	chp_id_for_each(&chpid) {
		t = cfg_get_task(chpid);
		if (t != cfg_none) {
			cfg_set_task(chpid, cfg_none);
			break;
		}
	}
	mutex_unlock(&cfg_lock);

	switch (t) {
	case cfg_configure:
		rc = sclp_chp_configure(chpid);
		if (rc)
			CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)="
				      "%d\n", chpid.cssid, chpid.id, rc);
		else {
			info_expire();
			chsc_chp_online(chpid);
		}
		break;
	case cfg_deconfigure:
		rc = sclp_chp_deconfigure(chpid);
		if (rc)
			CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)="
				      "%d\n", chpid.cssid, chpid.id, rc);
		else {
			info_expire();
			chsc_chp_offline(chpid);
		}
		break;
	case cfg_none:
		/* Get updated information after last change. */
		info_update();
		mutex_lock(&cfg_lock);
		cfg_busy = 0;
		mutex_unlock(&cfg_lock);
		wake_up_interruptible(&cfg_wait_queue);
		return;
	}
	queue_work(chp_wq, &cfg_work);
}

/**
 * chp_cfg_schedule - schedule chpid configuration request
 * @chpid - channel-path ID
 * @configure - Non-zero for configure, zero for deconfigure
 *
 * Schedule a channel-path configuration/deconfiguration request.
 */
void chp_cfg_schedule(struct chp_id chpid, int configure)
{
	CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id,
		      configure);
	mutex_lock(&cfg_lock);
	cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure);
	cfg_busy = 1;
	mutex_unlock(&cfg_lock);
	queue_work(chp_wq, &cfg_work);
}

/**
 * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request
 * @chpid - channel-path ID
 *
 * Cancel an active channel-path deconfiguration request if it has not yet
 * been performed.
 */
void chp_cfg_cancel_deconfigure(struct chp_id chpid)
{
	CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id);
	mutex_lock(&cfg_lock);
	if (cfg_get_task(chpid) == cfg_deconfigure)
		cfg_set_task(chpid, cfg_none);
	mutex_unlock(&cfg_lock);
}

static int cfg_wait_idle(void)
{
	if (wait_event_interruptible(cfg_wait_queue, !cfg_busy))
		return -ERESTARTSYS;
	return 0;
}

static int __init chp_init(void)
{
	struct chp_id chpid;
	int ret;

	ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw);
	if (ret)
		return ret;
	chp_wq = create_singlethread_workqueue("cio_chp");
	if (!chp_wq) {
		crw_unregister_handler(CRW_RSC_CPATH);
		return -ENOMEM;
	}
	INIT_WORK(&cfg_work, cfg_func);
	init_waitqueue_head(&cfg_wait_queue);
	if (info_update())
		return 0;
	/* Register available channel-paths. */
	chp_id_for_each(&chpid) {
		if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED)
			chp_new(chpid);
	}

	return 0;
}

subsys_initcall(chp_init);