aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/edac/edac_device_sysfs.c
blob: 0e7ea3591b7812987c9e2efdb63dfa2a5306aa72 (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
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
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
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
/*
 * file for managing the edac_device subsystem of devices for EDAC
 *
 * (C) 2007 SoftwareBitMaker
 *
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written Doug Thompson <norsk5@xmission.com>
 *
 */

#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/edac.h>

#include "edac_device.h"
#include "edac_module.h"

#define EDAC_DEVICE_SYMLINK	"device"

#define to_edacdev(k) container_of(k, struct edac_device_ctl_info, kobj)
#define to_edacdev_attr(a) container_of(a, struct edacdev_attribute, attr)


/*
 * Set of edac_device_ctl_info attribute store/show functions
 */

/* 'log_ue' */
static ssize_t edac_device_ctl_log_ue_show(struct edac_device_ctl_info
					*ctl_info, char *data)
{
	return sprintf(data, "%u\n", ctl_info->log_ue);
}

static ssize_t edac_device_ctl_log_ue_store(struct edac_device_ctl_info
					*ctl_info, const char *data,
					size_t count)
{
	/* if parameter is zero, turn off flag, if non-zero turn on flag */
	ctl_info->log_ue = (simple_strtoul(data, NULL, 0) != 0);

	return count;
}

/* 'log_ce' */
static ssize_t edac_device_ctl_log_ce_show(struct edac_device_ctl_info
					*ctl_info, char *data)
{
	return sprintf(data, "%u\n", ctl_info->log_ce);
}

static ssize_t edac_device_ctl_log_ce_store(struct edac_device_ctl_info
					*ctl_info, const char *data,
					size_t count)
{
	/* if parameter is zero, turn off flag, if non-zero turn on flag */
	ctl_info->log_ce = (simple_strtoul(data, NULL, 0) != 0);

	return count;
}

/* 'panic_on_ue' */
static ssize_t edac_device_ctl_panic_on_ue_show(struct edac_device_ctl_info
						*ctl_info, char *data)
{
	return sprintf(data, "%u\n", ctl_info->panic_on_ue);
}

static ssize_t edac_device_ctl_panic_on_ue_store(struct edac_device_ctl_info
						 *ctl_info, const char *data,
						 size_t count)
{
	/* if parameter is zero, turn off flag, if non-zero turn on flag */
	ctl_info->panic_on_ue = (simple_strtoul(data, NULL, 0) != 0);

	return count;
}

/* 'poll_msec' show and store functions*/
static ssize_t edac_device_ctl_poll_msec_show(struct edac_device_ctl_info
					*ctl_info, char *data)
{
	return sprintf(data, "%u\n", ctl_info->poll_msec);
}

static ssize_t edac_device_ctl_poll_msec_store(struct edac_device_ctl_info
					*ctl_info, const char *data,
					size_t count)
{
	unsigned long value;

	/* get the value and enforce that it is non-zero, must be at least
	 * one millisecond for the delay period, between scans
	 * Then cancel last outstanding delay for the work request
	 * and set a new one.
	 */
	value = simple_strtoul(data, NULL, 0);
	edac_device_reset_delay_period(ctl_info, value);

	return count;
}

/* edac_device_ctl_info specific attribute structure */
struct ctl_info_attribute {
	struct attribute attr;
	ssize_t(*show) (struct edac_device_ctl_info *, char *);
	ssize_t(*store) (struct edac_device_ctl_info *, const char *, size_t);
};

#define to_ctl_info(k) container_of(k, struct edac_device_ctl_info, kobj)
#define to_ctl_info_attr(a) container_of(a,struct ctl_info_attribute,attr)

/* Function to 'show' fields from the edac_dev 'ctl_info' structure */
static ssize_t edac_dev_ctl_info_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
	struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);

	if (ctl_info_attr->show)
		return ctl_info_attr->show(edac_dev, buffer);
	return -EIO;
}

/* Function to 'store' fields into the edac_dev 'ctl_info' structure */
static ssize_t edac_dev_ctl_info_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buffer, size_t count)
{
	struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
	struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);

	if (ctl_info_attr->store)
		return ctl_info_attr->store(edac_dev, buffer, count);
	return -EIO;
}

/* edac_dev file operations for an 'ctl_info' */
static const struct sysfs_ops device_ctl_info_ops = {
	.show = edac_dev_ctl_info_show,
	.store = edac_dev_ctl_info_store
};

#define CTL_INFO_ATTR(_name,_mode,_show,_store)        \
static struct ctl_info_attribute attr_ctl_info_##_name = {      \
	.attr = {.name = __stringify(_name), .mode = _mode },   \
	.show   = _show,                                        \
	.store  = _store,                                       \
};

/* Declare the various ctl_info attributes here and their respective ops */
CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
	edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
	edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
	edac_device_ctl_panic_on_ue_show,
	edac_device_ctl_panic_on_ue_store);
CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
	edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);

/* Base Attributes of the EDAC_DEVICE ECC object */
static struct ctl_info_attribute *device_ctrl_attr[] = {
	&attr_ctl_info_panic_on_ue,
	&attr_ctl_info_log_ue,
	&attr_ctl_info_log_ce,
	&attr_ctl_info_poll_msec,
	NULL,
};

/*
 * edac_device_ctrl_master_release
 *
 *	called when the reference count for the 'main' kobj
 *	for a edac_device control struct reaches zero
 *
 *	Reference count model:
 *		One 'main' kobject for each control structure allocated.
 *		That main kobj is initially set to one AND
 *		the reference count for the EDAC 'core' module is
 *		bumped by one, thus added 'keep in memory' dependency.
 *
 *		Each new internal kobj (in instances and blocks) then
 *		bumps the 'main' kobject.
 *
 *		When they are released their release functions decrement
 *		the 'main' kobj.
 *
 *		When the main kobj reaches zero (0) then THIS function
 *		is called which then decrements the EDAC 'core' module.
 *		When the module reference count reaches zero then the
 *		module no longer has dependency on keeping the release
 *		function code in memory and module can be unloaded.
 *
 *		This will support several control objects as well, each
 *		with its own 'main' kobj.
 */
static void edac_device_ctrl_master_release(struct kobject *kobj)
{
	struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);

	edac_dbg(4, "control index=%d\n", edac_dev->dev_idx);

	/* decrement the EDAC CORE module ref count */
	module_put(edac_dev->owner);

	/* free the control struct containing the 'main' kobj
	 * passed in to this routine
	 */
	kfree(edac_dev);
}

/* ktype for the main (master) kobject */
static struct kobj_type ktype_device_ctrl = {
	.release = edac_device_ctrl_master_release,
	.sysfs_ops = &device_ctl_info_ops,
	.default_attrs = (struct attribute **)device_ctrl_attr,
};

/*
 * edac_device_register_sysfs_main_kobj
 *
 *	perform the high level setup for the new edac_device instance
 *
 * Return:  0 SUCCESS
 *         !0 FAILURE
 */
int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
{
	struct bus_type *edac_subsys;
	int err;

	edac_dbg(1, "\n");

	/* get the /sys/devices/system/edac reference */
	edac_subsys = edac_get_sysfs_subsys();

	/* Point to the 'edac_subsys' this instance 'reports' to */
	edac_dev->edac_subsys = edac_subsys;

	/* Init the devices's kobject */
	memset(&edac_dev->kobj, 0, sizeof(struct kobject));

	/* Record which module 'owns' this control structure
	 * and bump the ref count of the module
	 */
	edac_dev->owner = THIS_MODULE;

	if (!try_module_get(edac_dev->owner)) {
		err = -ENODEV;
		goto err_out;
	}

	/* register */
	err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
				   &edac_subsys->dev_root->kobj,
				   "%s", edac_dev->name);
	if (err) {
		edac_dbg(1, "Failed to register '.../edac/%s'\n",
			 edac_dev->name);
		goto err_kobj_reg;
	}
	kobject_uevent(&edac_dev->kobj, KOBJ_ADD);

	/* At this point, to 'free' the control struct,
	 * edac_device_unregister_sysfs_main_kobj() must be used
	 */

	edac_dbg(4, "Registered '.../edac/%s' kobject\n", edac_dev->name);

	return 0;

	/* Error exit stack */
err_kobj_reg:
	module_put(edac_dev->owner);

err_out:
	return err;
}

/*
 * edac_device_unregister_sysfs_main_kobj:
 *	the '..../edac/<name>' kobject
 */
void edac_device_unregister_sysfs_main_kobj(struct edac_device_ctl_info *dev)
{
	edac_dbg(0, "\n");
	edac_dbg(4, "name of kobject is: %s\n", kobject_name(&dev->kobj));

	/*
	 * Unregister the edac device's kobject and
	 * allow for reference count to reach 0 at which point
	 * the callback will be called to:
	 *   a) module_put() this module
	 *   b) 'kfree' the memory
	 */
	kobject_put(&dev->kobj);
}

/* edac_dev -> instance information */

/*
 * Set of low-level instance attribute show functions
 */
static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
				char *data)
{
	return sprintf(data, "%u\n", instance->counters.ue_count);
}

static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
				char *data)
{
	return sprintf(data, "%u\n", instance->counters.ce_count);
}

#define to_instance(k) container_of(k, struct edac_device_instance, kobj)
#define to_instance_attr(a) container_of(a,struct instance_attribute,attr)

/* DEVICE instance kobject release() function */
static void edac_device_ctrl_instance_release(struct kobject *kobj)
{
	struct edac_device_instance *instance;

	edac_dbg(1, "\n");

	/* map from this kobj to the main control struct
	 * and then dec the main kobj count
	 */
	instance = to_instance(kobj);
	kobject_put(&instance->ctl->kobj);
}

/* instance specific attribute structure */
struct instance_attribute {
	struct attribute attr;
	ssize_t(*show) (struct edac_device_instance *, char *);
	ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
};

/* Function to 'show' fields from the edac_dev 'instance' structure */
static ssize_t edac_dev_instance_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct edac_device_instance *instance = to_instance(kobj);
	struct instance_attribute *instance_attr = to_instance_attr(attr);

	if (instance_attr->show)
		return instance_attr->show(instance, buffer);
	return -EIO;
}

/* Function to 'store' fields into the edac_dev 'instance' structure */
static ssize_t edac_dev_instance_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buffer, size_t count)
{
	struct edac_device_instance *instance = to_instance(kobj);
	struct instance_attribute *instance_attr = to_instance_attr(attr);

	if (instance_attr->store)
		return instance_attr->store(instance, buffer, count);
	return -EIO;
}

/* edac_dev file operations for an 'instance' */
static const struct sysfs_ops device_instance_ops = {
	.show = edac_dev_instance_show,
	.store = edac_dev_instance_store
};

#define INSTANCE_ATTR(_name,_mode,_show,_store)        \
static struct instance_attribute attr_instance_##_name = {      \
	.attr = {.name = __stringify(_name), .mode = _mode },   \
	.show   = _show,                                        \
	.store  = _store,                                       \
};

/*
 * Define attributes visible for the edac_device instance object
 *	Each contains a pointer to a show and an optional set
 *	function pointer that does the low level output/input
 */
INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);

/* list of edac_dev 'instance' attributes */
static struct instance_attribute *device_instance_attr[] = {
	&attr_instance_ce_count,
	&attr_instance_ue_count,
	NULL,
};

/* The 'ktype' for each edac_dev 'instance' */
static struct kobj_type ktype_instance_ctrl = {
	.release = edac_device_ctrl_instance_release,
	.sysfs_ops = &device_instance_ops,
	.default_attrs = (struct attribute **)device_instance_attr,
};

/* edac_dev -> instance -> block information */

#define to_block(k) container_of(k, struct edac_device_block, kobj)
#define to_block_attr(a) \
	container_of(a, struct edac_dev_sysfs_block_attribute, attr)

/*
 * Set of low-level block attribute show functions
 */
static ssize_t block_ue_count_show(struct kobject *kobj,
					struct attribute *attr, char *data)
{
	struct edac_device_block *block = to_block(kobj);

	return sprintf(data, "%u\n", block->counters.ue_count);
}

static ssize_t block_ce_count_show(struct kobject *kobj,
					struct attribute *attr, char *data)
{
	struct edac_device_block *block = to_block(kobj);

	return sprintf(data, "%u\n", block->counters.ce_count);
}

/* DEVICE block kobject release() function */
static void edac_device_ctrl_block_release(struct kobject *kobj)
{
	struct edac_device_block *block;

	edac_dbg(1, "\n");

	/* get the container of the kobj */
	block = to_block(kobj);

	/* map from 'block kobj' to 'block->instance->controller->main_kobj'
	 * now 'release' the block kobject
	 */
	kobject_put(&block->instance->ctl->kobj);
}


/* Function to 'show' fields from the edac_dev 'block' structure */
static ssize_t edac_dev_block_show(struct kobject *kobj,
				struct attribute *attr, char *buffer)
{
	struct edac_dev_sysfs_block_attribute *block_attr =
						to_block_attr(attr);

	if (block_attr->show)
		return block_attr->show(kobj, attr, buffer);
	return -EIO;
}

/* Function to 'store' fields into the edac_dev 'block' structure */
static ssize_t edac_dev_block_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buffer, size_t count)
{
	struct edac_dev_sysfs_block_attribute *block_attr;

	block_attr = to_block_attr(attr);

	if (block_attr->store)
		return block_attr->store(kobj, attr, buffer, count);
	return -EIO;
}

/* edac_dev file operations for a 'block' */
static const struct sysfs_ops device_block_ops = {
	.show = edac_dev_block_show,
	.store = edac_dev_block_store
};

#define BLOCK_ATTR(_name,_mode,_show,_store)        \
static struct edac_dev_sysfs_block_attribute attr_block_##_name = {	\
	.attr = {.name = __stringify(_name), .mode = _mode },   \
	.show   = _show,                                        \
	.store  = _store,                                       \
};

BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);

/* list of edac_dev 'block' attributes */
static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
	&attr_block_ce_count,
	&attr_block_ue_count,
	NULL,
};

/* The 'ktype' for each edac_dev 'block' */
static struct kobj_type ktype_block_ctrl = {
	.release = edac_device_ctrl_block_release,
	.sysfs_ops = &device_block_ops,
	.default_attrs = (struct attribute **)device_block_attr,
};

/* block ctor/dtor  code */

/*
 * edac_device_create_block
 */
static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
				struct edac_device_instance *instance,
				struct edac_device_block *block)
{
	int i;
	int err;
	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
	struct kobject *main_kobj;

	edac_dbg(4, "Instance '%s' inst_p=%p  block '%s'  block_p=%p\n",
		 instance->name, instance, block->name, block);
	edac_dbg(4, "block kobj=%p  block kobj->parent=%p\n",
		 &block->kobj, &block->kobj.parent);

	/* init this block's kobject */
	memset(&block->kobj, 0, sizeof(struct kobject));

	/* bump the main kobject's reference count for this controller
	 * and this instance is dependent on the main
	 */
	main_kobj = kobject_get(&edac_dev->kobj);
	if (!main_kobj) {
		err = -ENODEV;
		goto err_out;
	}

	/* Add this block's kobject */
	err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
				   &instance->kobj,
				   "%s", block->name);
	if (err) {
		edac_dbg(1, "Failed to register instance '%s'\n", block->name);
		kobject_put(main_kobj);
		err = -ENODEV;
		goto err_out;
	}

	/* If there are driver level block attributes, then added them
	 * to the block kobject
	 */
	sysfs_attrib = block->block_attributes;
	if (sysfs_attrib && block->nr_attribs) {
		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

			edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n",
				 sysfs_attrib->attr.name,
				 sysfs_attrib, &block->kobj);

			/* Create each block_attribute file */
			err = sysfs_create_file(&block->kobj,
				&sysfs_attrib->attr);
			if (err)
				goto err_on_attrib;
		}
	}
	kobject_uevent(&block->kobj, KOBJ_ADD);

	return 0;

	/* Error unwind stack */
err_on_attrib:
	kobject_put(&block->kobj);

err_out:
	return err;
}

/*
 * edac_device_delete_block(edac_dev,block);
 */
static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
				struct edac_device_block *block)
{
	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
	int i;

	/* if this block has 'attributes' then we need to iterate over the list
	 * and 'remove' the attributes on this block
	 */
	sysfs_attrib = block->block_attributes;
	if (sysfs_attrib && block->nr_attribs) {
		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {

			/* remove each block_attrib file */
			sysfs_remove_file(&block->kobj,
				(struct attribute *) sysfs_attrib);
		}
	}

	/* unregister this block's kobject, SEE:
	 *	edac_device_ctrl_block_release() callback operation
	 */
	kobject_put(&block->kobj);
}

/* instance ctor/dtor code */

/*
 * edac_device_create_instance
 *	create just one instance of an edac_device 'instance'
 */
static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
				int idx)
{
	int i, j;
	int err;
	struct edac_device_instance *instance;
	struct kobject *main_kobj;

	instance = &edac_dev->instances[idx];

	/* Init the instance's kobject */
	memset(&instance->kobj, 0, sizeof(struct kobject));

	instance->ctl = edac_dev;

	/* bump the main kobject's reference count for this controller
	 * and this instance is dependent on the main
	 */
	main_kobj = kobject_get(&edac_dev->kobj);
	if (!main_kobj) {
		err = -ENODEV;
		goto err_out;
	}

	/* Formally register this instance's kobject under the edac_device */
	err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
				   &edac_dev->kobj, "%s", instance->name);
	if (err != 0) {
		edac_dbg(2, "Failed to register instance '%s'\n",
			 instance->name);
		kobject_put(main_kobj);
		goto err_out;
	}

	edac_dbg(4, "now register '%d' blocks for instance %d\n",
		 instance->nr_blocks, idx);

	/* register all blocks of this instance */
	for (i = 0; i < instance->nr_blocks; i++) {
		err = edac_device_create_block(edac_dev, instance,
						&instance->blocks[i]);
		if (err) {
			/* If any fail, remove all previous ones */
			for (j = 0; j < i; j++)
				edac_device_delete_block(edac_dev,
							&instance->blocks[j]);
			goto err_release_instance_kobj;
		}
	}
	kobject_uevent(&instance->kobj, KOBJ_ADD);

	edac_dbg(4, "Registered instance %d '%s' kobject\n",
		 idx, instance->name);

	return 0;

	/* error unwind stack */
err_release_instance_kobj:
	kobject_put(&instance->kobj);

err_out:
	return err;
}

/*
 * edac_device_remove_instance
 *	remove an edac_device instance
 */
static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
					int idx)
{
	struct edac_device_instance *instance;
	int i;

	instance = &edac_dev->instances[idx];

	/* unregister all blocks in this instance */
	for (i = 0; i < instance->nr_blocks; i++)
		edac_device_delete_block(edac_dev, &instance->blocks[i]);

	/* unregister this instance's kobject, SEE:
	 *	edac_device_ctrl_instance_release() for callback operation
	 */
	kobject_put(&instance->kobj);
}

/*
 * edac_device_create_instances
 *	create the first level of 'instances' for this device
 *	(ie  'cache' might have 'cache0', 'cache1', 'cache2', etc
 */
static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
{
	int i, j;
	int err;

	edac_dbg(0, "\n");

	/* iterate over creation of the instances */
	for (i = 0; i < edac_dev->nr_instances; i++) {
		err = edac_device_create_instance(edac_dev, i);
		if (err) {
			/* unwind previous instances on error */
			for (j = 0; j < i; j++)
				edac_device_delete_instance(edac_dev, j);
			return err;
		}
	}

	return 0;
}

/*
 * edac_device_delete_instances(edac_dev);
 *	unregister all the kobjects of the instances
 */
static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
{
	int i;

	/* iterate over creation of the instances */
	for (i = 0; i < edac_dev->nr_instances; i++)
		edac_device_delete_instance(edac_dev, i);
}

/* edac_dev sysfs ctor/dtor  code */

/*
 * edac_device_add_main_sysfs_attributes
 *	add some attributes to this instance's main kobject
 */
static int edac_device_add_main_sysfs_attributes(
			struct edac_device_ctl_info *edac_dev)
{
	struct edac_dev_sysfs_attribute *sysfs_attrib;
	int err = 0;

	sysfs_attrib = edac_dev->sysfs_attributes;
	if (sysfs_attrib) {
		/* iterate over the array and create an attribute for each
		 * entry in the list
		 */
		while (sysfs_attrib->attr.name != NULL) {
			err = sysfs_create_file(&edac_dev->kobj,
				(struct attribute*) sysfs_attrib);
			if (err)
				goto err_out;

			sysfs_attrib++;
		}
	}

err_out:
	return err;
}

/*
 * edac_device_remove_main_sysfs_attributes
 *	remove any attributes to this instance's main kobject
 */
static void edac_device_remove_main_sysfs_attributes(
			struct edac_device_ctl_info *edac_dev)
{
	struct edac_dev_sysfs_attribute *sysfs_attrib;

	/* if there are main attributes, defined, remove them. First,
	 * point to the start of the array and iterate over it
	 * removing each attribute listed from this device's instance's kobject
	 */
	sysfs_attrib = edac_dev->sysfs_attributes;
	if (sysfs_attrib) {
		while (sysfs_attrib->attr.name != NULL) {
			sysfs_remove_file(&edac_dev->kobj,
					(struct attribute *) sysfs_attrib);
			sysfs_attrib++;
		}
	}
}

/*
 * edac_device_create_sysfs() Constructor
 *
 * accept a created edac_device control structure
 * and 'export' it to sysfs. The 'main' kobj should already have been
 * created. 'instance' and 'block' kobjects should be registered
 * along with any 'block' attributes from the low driver. In addition,
 * the main attributes (if any) are connected to the main kobject of
 * the control structure.
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
{
	int err;
	struct kobject *edac_kobj = &edac_dev->kobj;

	edac_dbg(0, "idx=%d\n", edac_dev->dev_idx);

	/*  go create any main attributes callers wants */
	err = edac_device_add_main_sysfs_attributes(edac_dev);
	if (err) {
		edac_dbg(0, "failed to add sysfs attribs\n");
		goto err_out;
	}

	/* create a symlink from the edac device
	 * to the platform 'device' being used for this
	 */
	err = sysfs_create_link(edac_kobj,
				&edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
	if (err) {
		edac_dbg(0, "sysfs_create_link() returned err= %d\n", err);
		goto err_remove_main_attribs;
	}

	/* Create the first level instance directories
	 * In turn, the nested blocks beneath the instances will
	 * be registered as well
	 */
	err = edac_device_create_instances(edac_dev);
	if (err) {
		edac_dbg(0, "edac_device_create_instances() returned err= %d\n",
			 err);
		goto err_remove_link;
	}


	edac_dbg(4, "create-instances done, idx=%d\n", edac_dev->dev_idx);

	return 0;

	/* Error unwind stack */
err_remove_link:
	/* remove the sym link */
	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

err_remove_main_attribs:
	edac_device_remove_main_sysfs_attributes(edac_dev);

err_out:
	return err;
}

/*
 * edac_device_remove_sysfs() destructor
 *
 * given an edac_device struct, tear down the kobject resources
 */
void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
{
	edac_dbg(0, "\n");

	/* remove any main attributes for this device */
	edac_device_remove_main_sysfs_attributes(edac_dev);

	/* remove the device sym link */
	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);

	/* walk the instance/block kobject tree, deconstructing it */
	edac_device_delete_instances(edac_dev);
}

Privacy Policy