summaryrefslogtreecommitdiff
path: root/drivers/edac/edac_mc_sysfs.c
blob: a4135860149b5592e6e73e8036796f63e6f045d4 (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
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
/*
 * edac_mc kernel module
 * (C) 2005-2007 Linux Networx (http://lnxi.com)
 *
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com
 *
 */

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

#include "edac_core.h"
#include "edac_module.h"


/* MC EDAC Controls, setable by module parameter, and sysfs */
static int edac_mc_log_ue = 1;
static int edac_mc_log_ce = 1;
static int edac_mc_panic_on_ue;
static int edac_mc_poll_msec = 1000;

/* Getter functions for above */
int edac_mc_get_log_ue(void)
{
	return edac_mc_log_ue;
}

int edac_mc_get_log_ce(void)
{
	return edac_mc_log_ce;
}

int edac_mc_get_panic_on_ue(void)
{
	return edac_mc_panic_on_ue;
}

/* this is temporary */
int edac_mc_get_poll_msec(void)
{
	return edac_mc_poll_msec;
}

static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
{
	long l;
	int ret;

	if (!val)
		return -EINVAL;

	ret = strict_strtol(val, 0, &l);
	if (ret == -EINVAL || ((int)l != l))
		return -EINVAL;
	*((int *)kp->arg) = l;

	/* notify edac_mc engine to reset the poll period */
	edac_mc_reset_delay_period(l);

	return 0;
}

/* Parameter declarations for above */
module_param(edac_mc_panic_on_ue, int, 0644);
MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
module_param(edac_mc_log_ue, int, 0644);
MODULE_PARM_DESC(edac_mc_log_ue,
		 "Log uncorrectable error to console: 0=off 1=on");
module_param(edac_mc_log_ce, int, 0644);
MODULE_PARM_DESC(edac_mc_log_ce,
		 "Log correctable error to console: 0=off 1=on");
module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
		  &edac_mc_poll_msec, 0644);
MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");

/*
 * various constants for Memory Controllers
 */
static const char *mem_types[] = {
	[MEM_EMPTY] = "Empty",
	[MEM_RESERVED] = "Reserved",
	[MEM_UNKNOWN] = "Unknown",
	[MEM_FPM] = "FPM",
	[MEM_EDO] = "EDO",
	[MEM_BEDO] = "BEDO",
	[MEM_SDR] = "Unbuffered-SDR",
	[MEM_RDR] = "Registered-SDR",
	[MEM_DDR] = "Unbuffered-DDR",
	[MEM_RDDR] = "Registered-DDR",
	[MEM_RMBS] = "RMBS",
	[MEM_DDR2] = "Unbuffered-DDR2",
	[MEM_FB_DDR2] = "FullyBuffered-DDR2",
	[MEM_RDDR2] = "Registered-DDR2",
	[MEM_XDR] = "XDR",
	[MEM_DDR3] = "Unbuffered-DDR3",
	[MEM_RDDR3] = "Registered-DDR3"
};

static const char *dev_types[] = {
	[DEV_UNKNOWN] = "Unknown",
	[DEV_X1] = "x1",
	[DEV_X2] = "x2",
	[DEV_X4] = "x4",
	[DEV_X8] = "x8",
	[DEV_X16] = "x16",
	[DEV_X32] = "x32",
	[DEV_X64] = "x64"
};

static const char *edac_caps[] = {
	[EDAC_UNKNOWN] = "Unknown",
	[EDAC_NONE] = "None",
	[EDAC_RESERVED] = "Reserved",
	[EDAC_PARITY] = "PARITY",
	[EDAC_EC] = "EC",
	[EDAC_SECDED] = "SECDED",
	[EDAC_S2ECD2ED] = "S2ECD2ED",
	[EDAC_S4ECD4ED] = "S4ECD4ED",
	[EDAC_S8ECD8ED] = "S8ECD8ED",
	[EDAC_S16ECD16ED] = "S16ECD16ED"
};

/* EDAC sysfs CSROW data structures and methods
 */

/* Set of more default csrow<id> attribute show/store functions */
static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%u\n", csrow->ue_count);
}

static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%u\n", csrow->ce_count);
}

static ssize_t csrow_size_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%u\n", PAGES_TO_MiB(csrow->nr_pages));
}

static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%s\n", mem_types[csrow->mtype]);
}

static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%s\n", dev_types[csrow->dtype]);
}

static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data,
				int private)
{
	return sprintf(data, "%s\n", edac_caps[csrow->edac_mode]);
}

/* show/store functions for DIMM Label attributes */
static ssize_t channel_dimm_label_show(struct csrow_info *csrow,
				char *data, int channel)
{
	/* if field has not been initialized, there is nothing to send */
	if (!csrow->channels[channel].label[0])
		return 0;

	return snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
			csrow->channels[channel].label);
}

static ssize_t channel_dimm_label_store(struct csrow_info *csrow,
					const char *data,
					size_t count, int channel)
{
	ssize_t max_size = 0;

	max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
	strncpy(csrow->channels[channel].label, data, max_size);
	csrow->channels[channel].label[max_size] = '\0';

	return max_size;
}

/* show function for dynamic chX_ce_count attribute */
static ssize_t channel_ce_count_show(struct csrow_info *csrow,
				char *data, int channel)
{
	return sprintf(data, "%u\n", csrow->channels[channel].ce_count);
}

/* csrow specific attribute structure */
struct csrowdev_attribute {
	struct attribute attr;
	 ssize_t(*show) (struct csrow_info *, char *, int);
	 ssize_t(*store) (struct csrow_info *, const char *, size_t, int);
	int private;
};

#define to_csrow(k) container_of(k, struct csrow_info, kobj)
#define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)

/* Set of show/store higher level functions for default csrow attributes */
static ssize_t csrowdev_show(struct kobject *kobj,
			struct attribute *attr, char *buffer)
{
	struct csrow_info *csrow = to_csrow(kobj);
	struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);

	if (csrowdev_attr->show)
		return csrowdev_attr->show(csrow,
					buffer, csrowdev_attr->private);
	return -EIO;
}

static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
			const char *buffer, size_t count)
{
	struct csrow_info *csrow = to_csrow(kobj);
	struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);

	if (csrowdev_attr->store)
		return csrowdev_attr->store(csrow,
					buffer,
					count, csrowdev_attr->private);
	return -EIO;
}

static const struct sysfs_ops csrowfs_ops = {
	.show = csrowdev_show,
	.store = csrowdev_store
};

#define CSROWDEV_ATTR(_name,_mode,_show,_store,_private)	\
static struct csrowdev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show   = _show,					\
	.store  = _store,					\
	.private = _private,					\
};

/* default cwrow<id>/attribute files */
CSROWDEV_ATTR(size_mb, S_IRUGO, csrow_size_show, NULL, 0);
CSROWDEV_ATTR(dev_type, S_IRUGO, csrow_dev_type_show, NULL, 0);
CSROWDEV_ATTR(mem_type, S_IRUGO, csrow_mem_type_show, NULL, 0);
CSROWDEV_ATTR(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL, 0);
CSROWDEV_ATTR(ue_count, S_IRUGO, csrow_ue_count_show, NULL, 0);
CSROWDEV_ATTR(ce_count, S_IRUGO, csrow_ce_count_show, NULL, 0);

/* default attributes of the CSROW<id> object */
static struct csrowdev_attribute *default_csrow_attr[] = {
	&attr_dev_type,
	&attr_mem_type,
	&attr_edac_mode,
	&attr_size_mb,
	&attr_ue_count,
	&attr_ce_count,
	NULL,
};

/* possible dynamic channel DIMM Label attribute files */
CSROWDEV_ATTR(ch0_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 0);
CSROWDEV_ATTR(ch1_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 1);
CSROWDEV_ATTR(ch2_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 2);
CSROWDEV_ATTR(ch3_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 3);
CSROWDEV_ATTR(ch4_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 4);
CSROWDEV_ATTR(ch5_dimm_label, S_IRUGO | S_IWUSR,
	channel_dimm_label_show, channel_dimm_label_store, 5);

/* Total possible dynamic DIMM Label attribute file table */
static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = {
	&attr_ch0_dimm_label,
	&attr_ch1_dimm_label,
	&attr_ch2_dimm_label,
	&attr_ch3_dimm_label,
	&attr_ch4_dimm_label,
	&attr_ch5_dimm_label
};

/* possible dynamic channel ce_count attribute files */
CSROWDEV_ATTR(ch0_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 0);
CSROWDEV_ATTR(ch1_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 1);
CSROWDEV_ATTR(ch2_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 2);
CSROWDEV_ATTR(ch3_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 3);
CSROWDEV_ATTR(ch4_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 4);
CSROWDEV_ATTR(ch5_ce_count, S_IRUGO | S_IWUSR, channel_ce_count_show, NULL, 5);

/* Total possible dynamic ce_count attribute file table */
static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = {
	&attr_ch0_ce_count,
	&attr_ch1_ce_count,
	&attr_ch2_ce_count,
	&attr_ch3_ce_count,
	&attr_ch4_ce_count,
	&attr_ch5_ce_count
};

#define EDAC_NR_CHANNELS	6

/* Create dynamic CHANNEL files, indexed by 'chan',  under specifed CSROW */
static int edac_create_channel_files(struct kobject *kobj, int chan)
{
	int err = -ENODEV;

	if (chan >= EDAC_NR_CHANNELS)
		return err;

	/* create the DIMM label attribute file */
	err = sysfs_create_file(kobj,
				(struct attribute *)
				dynamic_csrow_dimm_attr[chan]);

	if (!err) {
		/* create the CE Count attribute file */
		err = sysfs_create_file(kobj,
					(struct attribute *)
					dynamic_csrow_ce_count_attr[chan]);
	} else {
		debugf1("%s()  dimm labels and ce_count files created",
			__func__);
	}

	return err;
}

/* No memory to release for this kobj */
static void edac_csrow_instance_release(struct kobject *kobj)
{
	struct mem_ctl_info *mci;
	struct csrow_info *cs;

	debugf1("%s()\n", __func__);

	cs = container_of(kobj, struct csrow_info, kobj);
	mci = cs->mci;

	kobject_put(&mci->edac_mci_kobj);
}

/* the kobj_type instance for a CSROW */
static struct kobj_type ktype_csrow = {
	.release = edac_csrow_instance_release,
	.sysfs_ops = &csrowfs_ops,
	.default_attrs = (struct attribute **)default_csrow_attr,
};

/* Create a CSROW object under specifed edac_mc_device */
static int edac_create_csrow_object(struct mem_ctl_info *mci,
					struct csrow_info *csrow, int index)
{
	struct kobject *kobj_mci = &mci->edac_mci_kobj;
	struct kobject *kobj;
	int chan;
	int err;

	/* generate ..../edac/mc/mc<id>/csrow<index>   */
	memset(&csrow->kobj, 0, sizeof(csrow->kobj));
	csrow->mci = mci;	/* include container up link */

	/* bump the mci instance's kobject's ref count */
	kobj = kobject_get(&mci->edac_mci_kobj);
	if (!kobj) {
		err = -ENODEV;
		goto err_out;
	}

	/* Instanstiate the csrow object */
	err = kobject_init_and_add(&csrow->kobj, &ktype_csrow, kobj_mci,
				   "csrow%d", index);
	if (err)
		goto err_release_top_kobj;

	/* At this point, to release a csrow kobj, one must
	 * call the kobject_put and allow that tear down
	 * to work the releasing
	 */

	/* Create the dyanmic attribute files on this csrow,
	 * namely, the DIMM labels and the channel ce_count
	 */
	for (chan = 0; chan < csrow->nr_channels; chan++) {
		err = edac_create_channel_files(&csrow->kobj, chan);
		if (err) {
			/* special case the unregister here */
			kobject_put(&csrow->kobj);
			goto err_out;
		}
	}
	kobject_uevent(&csrow->kobj, KOBJ_ADD);
	return 0;

	/* error unwind stack */
err_release_top_kobj:
	kobject_put(&mci->edac_mci_kobj);

err_out:
	return err;
}

/* default sysfs methods and data structures for the main MCI kobject */

static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
					const char *data, size_t count)
{
	int row, chan;

	mci->ue_noinfo_count = 0;
	mci->ce_noinfo_count = 0;
	mci->ue_count = 0;
	mci->ce_count = 0;

	for (row = 0; row < mci->nr_csrows; row++) {
		struct csrow_info *ri = &mci->csrows[row];

		ri->ue_count = 0;
		ri->ce_count = 0;

		for (chan = 0; chan < ri->nr_channels; chan++)
			ri->channels[chan].ce_count = 0;
	}

	mci->start_time = jiffies;
	return count;
}

/* memory scrubbing */
static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
					  const char *data, size_t count)
{
	unsigned long bandwidth = 0;
	int err;

	if (!mci->set_sdram_scrub_rate) {
		edac_printk(KERN_WARNING, EDAC_MC,
			    "Memory scrub rate setting not implemented!\n");
		return -EINVAL;
	}

	if (strict_strtoul(data, 10, &bandwidth) < 0)
		return -EINVAL;

	err = mci->set_sdram_scrub_rate(mci, (u32)bandwidth);
	if (err) {
		edac_printk(KERN_DEBUG, EDAC_MC,
			    "Failed setting scrub rate to %lu\n", bandwidth);
		return -EINVAL;
	}
	else {
		edac_printk(KERN_DEBUG, EDAC_MC,
			    "Scrub rate set to: %lu\n", bandwidth);
		return count;
	}
}

static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
{
	u32 bandwidth = 0;
	int err;

	if (!mci->get_sdram_scrub_rate) {
		edac_printk(KERN_WARNING, EDAC_MC,
			    "Memory scrub rate reading not implemented\n");
		return -EINVAL;
	}

	err = mci->get_sdram_scrub_rate(mci, &bandwidth);
	if (err) {
		edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
		return err;
	}
	else {
		edac_printk(KERN_DEBUG, EDAC_MC,
			    "Read scrub rate: %d\n", bandwidth);
		return sprintf(data, "%d\n", bandwidth);
	}
}

/* default attribute files for the MCI object */
static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%d\n", mci->ue_count);
}

static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%d\n", mci->ce_count);
}

static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%d\n", mci->ce_noinfo_count);
}

static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%d\n", mci->ue_noinfo_count);
}

static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ);
}

static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data, "%s\n", mci->ctl_name);
}

static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
{
	int total_pages, csrow_idx;

	for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
		csrow_idx++) {
		struct csrow_info *csrow = &mci->csrows[csrow_idx];

		if (!csrow->nr_pages)
			continue;

		total_pages += csrow->nr_pages;
	}

	return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
}

#define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
#define to_mcidev_attr(a) container_of(a,struct mcidev_sysfs_attribute,attr)

/* MCI show/store functions for top most object */
static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
			char *buffer)
{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);

	if (mcidev_attr->show)
		return mcidev_attr->show(mem_ctl_info, buffer);

	return -EIO;
}

static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
			const char *buffer, size_t count)
{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);

	if (mcidev_attr->store)
		return mcidev_attr->store(mem_ctl_info, buffer, count);

	return -EIO;
}

/* Intermediate show/store table */
static const struct sysfs_ops mci_ops = {
	.show = mcidev_show,
	.store = mcidev_store
};

#define MCIDEV_ATTR(_name,_mode,_show,_store)			\
static struct mcidev_sysfs_attribute mci_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show   = _show,					\
	.store  = _store,					\
};

/* default Control file */
MCIDEV_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);

/* default Attribute files */
MCIDEV_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL);
MCIDEV_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL);
MCIDEV_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL);
MCIDEV_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL);
MCIDEV_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL);
MCIDEV_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL);
MCIDEV_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL);

/* memory scrubber attribute file */
MCIDEV_ATTR(sdram_scrub_rate, S_IRUGO | S_IWUSR, mci_sdram_scrub_rate_show,
	mci_sdram_scrub_rate_store);

static struct mcidev_sysfs_attribute *mci_attr[] = {
	&mci_attr_reset_counters,
	&mci_attr_mc_name,
	&mci_attr_size_mb,
	&mci_attr_seconds_since_reset,
	&mci_attr_ue_noinfo_count,
	&mci_attr_ce_noinfo_count,
	&mci_attr_ue_count,
	&mci_attr_ce_count,
	&mci_attr_sdram_scrub_rate,
	NULL
};


/*
 * Release of a MC controlling instance
 *
 *	each MC control instance has the following resources upon entry:
 *		a) a ref count on the top memctl kobj
 *		b) a ref count on this module
 *
 *	this function must decrement those ref counts and then
 *	issue a free on the instance's memory
 */
static void edac_mci_control_release(struct kobject *kobj)
{
	struct mem_ctl_info *mci;

	mci = to_mci(kobj);

	debugf0("%s() mci instance idx=%d releasing\n", __func__, mci->mc_idx);

	/* decrement the module ref count */
	module_put(mci->owner);

	/* free the mci instance memory here */
	kfree(mci);
}

static struct kobj_type ktype_mci = {
	.release = edac_mci_control_release,
	.sysfs_ops = &mci_ops,
	.default_attrs = (struct attribute **)mci_attr,
};

/* EDAC memory controller sysfs kset:
 *	/sys/devices/system/edac/mc
 */
static struct kset *mc_kset;

/*
 * edac_mc_register_sysfs_main_kobj
 *
 *	setups and registers the main kobject for each mci
 */
int edac_mc_register_sysfs_main_kobj(struct mem_ctl_info *mci)
{
	struct kobject *kobj_mci;
	int err;

	debugf1("%s()\n", __func__);

	kobj_mci = &mci->edac_mci_kobj;

	/* Init the mci's kobject */
	memset(kobj_mci, 0, sizeof(*kobj_mci));

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

	/* bump ref count on this module */
	if (!try_module_get(mci->owner)) {
		err = -ENODEV;
		goto fail_out;
	}

	/* this instance become part of the mc_kset */
	kobj_mci->kset = mc_kset;

	/* register the mc<id> kobject to the mc_kset */
	err = kobject_init_and_add(kobj_mci, &ktype_mci, NULL,
				   "mc%d", mci->mc_idx);
	if (err) {
		debugf1("%s()Failed to register '.../edac/mc%d'\n",
			__func__, mci->mc_idx);
		goto kobj_reg_fail;
	}
	kobject_uevent(kobj_mci, KOBJ_ADD);

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

	debugf1("%s() Registered '.../edac/mc%d' kobject\n",
		__func__, mci->mc_idx);

	return 0;

	/* Error exit stack */

kobj_reg_fail:
	module_put(mci->owner);

fail_out:
	return err;
}

/*
 * edac_mc_register_sysfs_main_kobj
 *
 *	tears down and the main mci kobject from the mc_kset
 */
void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
{
	/* delete the kobj from the mc_kset */
	kobject_put(&mci->edac_mci_kobj);
}

#define EDAC_DEVICE_SYMLINK	"device"

#define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)

/* MCI show/store functions for top most object */
static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
			char *buffer)
{
	struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);

	if (mcidev_attr->show)
		return mcidev_attr->show(mem_ctl_info, buffer);

	return -EIO;
}

static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
			const char *buffer, size_t count)
{
	struct mem_ctl_info *mem_ctl_info = grp_to_mci(kobj);
	struct mcidev_sysfs_attribute *mcidev_attr = to_mcidev_attr(attr);

	debugf1("%s() mem_ctl_info %p\n", __func__, mem_ctl_info);

	if (mcidev_attr->store)
		return mcidev_attr->store(mem_ctl_info, buffer, count);

	return -EIO;
}

/* No memory to release for this kobj */
static void edac_inst_grp_release(struct kobject *kobj)
{
	struct mcidev_sysfs_group_kobj *grp;
	struct mem_ctl_info *mci;

	debugf1("%s()\n", __func__);

	grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
	mci = grp->mci;

	kobject_put(&mci->edac_mci_kobj);
}

/* Intermediate show/store table */
static struct sysfs_ops inst_grp_ops = {
	.show = inst_grp_show,
	.store = inst_grp_store
};

/* the kobj_type instance for a instance group */
static struct kobj_type ktype_inst_grp = {
	.release = edac_inst_grp_release,
	.sysfs_ops = &inst_grp_ops,
};


/*
 * edac_create_mci_instance_attributes
 *	create MC driver specific attributes bellow an specified kobj
 * This routine calls itself recursively, in order to create an entire
 * object tree.
 */
static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
				struct mcidev_sysfs_attribute *sysfs_attrib,
				struct kobject *kobj)
{
	int err;

	debugf1("%s()\n", __func__);

	while (sysfs_attrib) {
		if (sysfs_attrib->grp) {
			struct mcidev_sysfs_group_kobj *grp_kobj;

			grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
			if (!grp_kobj)
				return -ENOMEM;

			list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);

			grp_kobj->grp = sysfs_attrib->grp;
			grp_kobj->mci = mci;

			debugf0("%s() grp %s, mci %p\n", __func__,
				sysfs_attrib->grp->name, mci);

			err = kobject_init_and_add(&grp_kobj->kobj,
						&ktype_inst_grp,
						&mci->edac_mci_kobj,
						sysfs_attrib->grp->name);
			if (err)
				return err;

			err = edac_create_mci_instance_attributes(mci,
					grp_kobj->grp->mcidev_attr,
					&grp_kobj->kobj);

			if (err)
				return err;
		} else if (sysfs_attrib->attr.name) {
			debugf0("%s() file %s\n", __func__,
				sysfs_attrib->attr.name);

			err = sysfs_create_file(kobj, &sysfs_attrib->attr);
		} else
			break;

		if (err) {
			return err;
		}
		sysfs_attrib++;
	}

	return 0;
}

/*
 * edac_remove_mci_instance_attributes
 *	remove MC driver specific attributes at the topmost level
 *	directory of this mci instance.
 */
static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
				struct mcidev_sysfs_attribute *sysfs_attrib,
				struct kobject *kobj, int count)
{
	struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;

	debugf1("%s()\n", __func__);

	/*
	 * loop if there are attributes and until we hit a NULL entry
	 * Remove first all the atributes
	 */
	while (sysfs_attrib) {
		if (sysfs_attrib->grp) {
			list_for_each_entry(grp_kobj, &mci->grp_kobj_list,
					    list)
				if (grp_kobj->grp == sysfs_attrib->grp)
					edac_remove_mci_instance_attributes(mci,
						    grp_kobj->grp->mcidev_attr,
						    &grp_kobj->kobj, count + 1);
		} else if (sysfs_attrib->attr.name) {
			debugf0("%s() file %s\n", __func__,
				sysfs_attrib->attr.name);
			sysfs_remove_file(kobj, &sysfs_attrib->attr);
		} else
			break;
		sysfs_attrib++;
	}

	/*
	 * Now that all attributes got removed, it is save to remove all groups
	 */
	if (!count)
		list_for_each_entry_safe(grp_kobj, tmp, &mci->grp_kobj_list,
					 list) {
			debugf0("%s() grp %s\n", __func__, grp_kobj->grp->name);
			kobject_put(&grp_kobj->kobj);
		}
}


/*
 * Create a new Memory Controller kobject instance,
 *	mc<id> under the 'mc' directory
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
{
	int i;
	int err;
	struct csrow_info *csrow;
	struct kobject *kobj_mci = &mci->edac_mci_kobj;

	debugf0("%s() idx=%d\n", __func__, mci->mc_idx);

	INIT_LIST_HEAD(&mci->grp_kobj_list);

	/* create a symlink for the device */
	err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
				EDAC_DEVICE_SYMLINK);
	if (err) {
		debugf1("%s() failure to create symlink\n", __func__);
		goto fail0;
	}

	/* If the low level driver desires some attributes,
	 * then create them now for the driver.
	 */
	if (mci->mc_driver_sysfs_attributes) {
		err = edac_create_mci_instance_attributes(mci,
					mci->mc_driver_sysfs_attributes,
					&mci->edac_mci_kobj);
		if (err) {
			debugf1("%s() failure to create mci attributes\n",
				__func__);
			goto fail0;
		}
	}

	/* Make directories for each CSROW object under the mc<id> kobject
	 */
	for (i = 0; i < mci->nr_csrows; i++) {
		csrow = &mci->csrows[i];

		/* Only expose populated CSROWs */
		if (csrow->nr_pages > 0) {
			err = edac_create_csrow_object(mci, csrow, i);
			if (err) {
				debugf1("%s() failure: create csrow %d obj\n",
					__func__, i);
				goto fail1;
			}
		}
	}

	return 0;

	/* CSROW error: backout what has already been registered,  */
fail1:
	for (i--; i >= 0; i--) {
		if (csrow->nr_pages > 0) {
			kobject_put(&mci->csrows[i].kobj);
		}
	}

	/* remove the mci instance's attributes, if any */
	edac_remove_mci_instance_attributes(mci,
		mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);

	/* remove the symlink */
	sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);

fail0:
	return err;
}

/*
 * remove a Memory Controller instance
 */
void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
{
	int i;

	debugf0("%s()\n", __func__);

	/* remove all csrow kobjects */
	for (i = 0; i < mci->nr_csrows; i++) {
		if (mci->csrows[i].nr_pages > 0) {
			debugf0("%s()  unreg csrow-%d\n", __func__, i);
			kobject_put(&mci->csrows[i].kobj);
		}
	}

	debugf0("%s()  remove_link\n", __func__);

	/* remove the symlink */
	sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);

	debugf0("%s()  remove_mci_instance\n", __func__);

	/* remove this mci instance's attribtes */
	edac_remove_mci_instance_attributes(mci,
					    mci->mc_driver_sysfs_attributes,
					    &mci->edac_mci_kobj, 0);
	debugf0("%s()  unregister this mci kobj\n", __func__);

	/* unregister this instance's kobject */
	kobject_put(&mci->edac_mci_kobj);
}




/*
 * edac_setup_sysfs_mc_kset(void)
 *
 * Initialize the mc_kset for the 'mc' entry
 *	This requires creating the top 'mc' directory with a kset
 *	and its controls/attributes.
 *
 *	To this 'mc' kset, instance 'mci' will be grouped as children.
 *
 * Return:  0 SUCCESS
 *         !0 FAILURE error code
 */
int edac_sysfs_setup_mc_kset(void)
{
	int err = -EINVAL;
	struct sysdev_class *edac_class;

	debugf1("%s()\n", __func__);

	/* get the /sys/devices/system/edac class reference */
	edac_class = edac_get_sysfs_class();
	if (edac_class == NULL) {
		debugf1("%s() no edac_class error=%d\n", __func__, err);
		goto fail_out;
	}

	/* Init the MC's kobject */
	mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
	if (!mc_kset) {
		err = -ENOMEM;
		debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
		goto fail_kset;
	}

	debugf1("%s() Registered '.../edac/mc' kobject\n", __func__);

	return 0;

fail_kset:
	edac_put_sysfs_class();

fail_out:
	return err;
}

/*
 * edac_sysfs_teardown_mc_kset
 *
 *	deconstruct the mc_ket for memory controllers
 */
void edac_sysfs_teardown_mc_kset(void)
{
	kset_unregister(mc_kset);
	edac_put_sysfs_class();
}