summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/hfi1/debugfs.c
blob: e9fa3c293e4242c3dd8c753efb6929117ed92b77 (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
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
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
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
#ifdef CONFIG_DEBUG_FS
/*
 * Copyright(c) 2015-2017 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ratelimit.h>
#include <linux/fault-inject.h>

#include "hfi.h"
#include "trace.h"
#include "debugfs.h"
#include "device.h"
#include "qp.h"
#include "sdma.h"

static struct dentry *hfi1_dbg_root;

/* wrappers to enforce srcu in seq file */
static ssize_t hfi1_seq_read(
	struct file *file,
	char __user *buf,
	size_t size,
	loff_t *ppos)
{
	struct dentry *d = file->f_path.dentry;
	int srcu_idx;
	ssize_t r;

	r = debugfs_use_file_start(d, &srcu_idx);
	if (likely(!r))
		r = seq_read(file, buf, size, ppos);
	debugfs_use_file_finish(srcu_idx);
	return r;
}

static loff_t hfi1_seq_lseek(
	struct file *file,
	loff_t offset,
	int whence)
{
	struct dentry *d = file->f_path.dentry;
	int srcu_idx;
	loff_t r;

	r = debugfs_use_file_start(d, &srcu_idx);
	if (likely(!r))
		r = seq_lseek(file, offset, whence);
	debugfs_use_file_finish(srcu_idx);
	return r;
}

#define private2dd(file) (file_inode(file)->i_private)
#define private2ppd(file) (file_inode(file)->i_private)

#define DEBUGFS_SEQ_FILE_OPS(name) \
static const struct seq_operations _##name##_seq_ops = { \
	.start = _##name##_seq_start, \
	.next  = _##name##_seq_next, \
	.stop  = _##name##_seq_stop, \
	.show  = _##name##_seq_show \
}

#define DEBUGFS_SEQ_FILE_OPEN(name) \
static int _##name##_open(struct inode *inode, struct file *s) \
{ \
	struct seq_file *seq; \
	int ret; \
	ret =  seq_open(s, &_##name##_seq_ops); \
	if (ret) \
		return ret; \
	seq = s->private_data; \
	seq->private = inode->i_private; \
	return 0; \
}

#define DEBUGFS_FILE_OPS(name) \
static const struct file_operations _##name##_file_ops = { \
	.owner   = THIS_MODULE, \
	.open    = _##name##_open, \
	.read    = hfi1_seq_read, \
	.llseek  = hfi1_seq_lseek, \
	.release = seq_release \
}

#define DEBUGFS_FILE_CREATE(name, parent, data, ops, mode)	\
do { \
	struct dentry *ent; \
	ent = debugfs_create_file(name, mode, parent, \
		data, ops); \
	if (!ent) \
		pr_warn("create of %s failed\n", name); \
} while (0)

#define DEBUGFS_SEQ_FILE_CREATE(name, parent, data) \
	DEBUGFS_FILE_CREATE(#name, parent, data, &_##name##_file_ops, S_IRUGO)

static void *_opcode_stats_seq_start(struct seq_file *s, loff_t *pos)
{
	struct hfi1_opcode_stats_perctx *opstats;

	if (*pos >= ARRAY_SIZE(opstats->stats))
		return NULL;
	return pos;
}

static void *_opcode_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	struct hfi1_opcode_stats_perctx *opstats;

	++*pos;
	if (*pos >= ARRAY_SIZE(opstats->stats))
		return NULL;
	return pos;
}

static void _opcode_stats_seq_stop(struct seq_file *s, void *v)
{
}

static int _opcode_stats_seq_show(struct seq_file *s, void *v)
{
	loff_t *spos = v;
	loff_t i = *spos, j;
	u64 n_packets = 0, n_bytes = 0;
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
		if (!dd->rcd[j])
			continue;
		n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
		n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
	}
	if (!n_packets && !n_bytes)
		return SEQ_SKIP;
	seq_printf(s, "%02llx %llu/%llu\n", i,
		   (unsigned long long)n_packets,
		   (unsigned long long)n_bytes);

	return 0;
}

DEBUGFS_SEQ_FILE_OPS(opcode_stats);
DEBUGFS_SEQ_FILE_OPEN(opcode_stats)
DEBUGFS_FILE_OPS(opcode_stats);

static void *_ctx_stats_seq_start(struct seq_file *s, loff_t *pos)
{
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	if (!*pos)
		return SEQ_START_TOKEN;
	if (*pos >= dd->first_dyn_alloc_ctxt)
		return NULL;
	return pos;
}

static void *_ctx_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	if (v == SEQ_START_TOKEN)
		return pos;

	++*pos;
	if (*pos >= dd->first_dyn_alloc_ctxt)
		return NULL;
	return pos;
}

static void _ctx_stats_seq_stop(struct seq_file *s, void *v)
{
	/* nothing allocated */
}

static int _ctx_stats_seq_show(struct seq_file *s, void *v)
{
	loff_t *spos;
	loff_t i, j;
	u64 n_packets = 0;
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	if (v == SEQ_START_TOKEN) {
		seq_puts(s, "Ctx:npkts\n");
		return 0;
	}

	spos = v;
	i = *spos;

	if (!dd->rcd[i])
		return SEQ_SKIP;

	for (j = 0; j < ARRAY_SIZE(dd->rcd[i]->opstats->stats); j++)
		n_packets += dd->rcd[i]->opstats->stats[j].n_packets;

	if (!n_packets)
		return SEQ_SKIP;

	seq_printf(s, "  %llu:%llu\n", i, n_packets);
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(ctx_stats);
DEBUGFS_SEQ_FILE_OPEN(ctx_stats)
DEBUGFS_FILE_OPS(ctx_stats);

static void *_qp_stats_seq_start(struct seq_file *s, loff_t *pos)
	__acquires(RCU)
{
	struct qp_iter *iter;
	loff_t n = *pos;

	iter = qp_iter_init(s->private);

	/* stop calls rcu_read_unlock */
	rcu_read_lock();

	if (!iter)
		return NULL;

	do {
		if (qp_iter_next(iter)) {
			kfree(iter);
			return NULL;
		}
	} while (n--);

	return iter;
}

static void *_qp_stats_seq_next(struct seq_file *s, void *iter_ptr,
				loff_t *pos)
	__must_hold(RCU)
{
	struct qp_iter *iter = iter_ptr;

	(*pos)++;

	if (qp_iter_next(iter)) {
		kfree(iter);
		return NULL;
	}

	return iter;
}

static void _qp_stats_seq_stop(struct seq_file *s, void *iter_ptr)
	__releases(RCU)
{
	rcu_read_unlock();
}

static int _qp_stats_seq_show(struct seq_file *s, void *iter_ptr)
{
	struct qp_iter *iter = iter_ptr;

	if (!iter)
		return 0;

	qp_iter_print(s, iter);

	return 0;
}

DEBUGFS_SEQ_FILE_OPS(qp_stats);
DEBUGFS_SEQ_FILE_OPEN(qp_stats)
DEBUGFS_FILE_OPS(qp_stats);

static void *_sdes_seq_start(struct seq_file *s, loff_t *pos)
{
	struct hfi1_ibdev *ibd;
	struct hfi1_devdata *dd;

	ibd = (struct hfi1_ibdev *)s->private;
	dd = dd_from_dev(ibd);
	if (!dd->per_sdma || *pos >= dd->num_sdma)
		return NULL;
	return pos;
}

static void *_sdes_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	++*pos;
	if (!dd->per_sdma || *pos >= dd->num_sdma)
		return NULL;
	return pos;
}

static void _sdes_seq_stop(struct seq_file *s, void *v)
{
}

static int _sdes_seq_show(struct seq_file *s, void *v)
{
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);
	loff_t *spos = v;
	loff_t i = *spos;

	sdma_seqfile_dump_sde(s, &dd->per_sdma[i]);
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(sdes);
DEBUGFS_SEQ_FILE_OPEN(sdes)
DEBUGFS_FILE_OPS(sdes);

/* read the per-device counters */
static ssize_t dev_counters_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	u64 *counters;
	size_t avail;
	struct hfi1_devdata *dd;
	ssize_t rval;

	dd = private2dd(file);
	avail = hfi1_read_cntrs(dd, NULL, &counters);
	rval =  simple_read_from_buffer(buf, count, ppos, counters, avail);
	return rval;
}

/* read the per-device counters */
static ssize_t dev_names_read(struct file *file, char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *names;
	size_t avail;
	struct hfi1_devdata *dd;
	ssize_t rval;

	dd = private2dd(file);
	avail = hfi1_read_cntrs(dd, &names, NULL);
	rval =  simple_read_from_buffer(buf, count, ppos, names, avail);
	return rval;
}

struct counter_info {
	char *name;
	const struct file_operations ops;
};

/*
 * Could use file_inode(file)->i_ino to figure out which file,
 * instead of separate routine for each, but for now, this works...
 */

/* read the per-port names (same for each port) */
static ssize_t portnames_read(struct file *file, char __user *buf,
			      size_t count, loff_t *ppos)
{
	char *names;
	size_t avail;
	struct hfi1_devdata *dd;
	ssize_t rval;

	dd = private2dd(file);
	avail = hfi1_read_portcntrs(dd->pport, &names, NULL);
	rval = simple_read_from_buffer(buf, count, ppos, names, avail);
	return rval;
}

/* read the per-port counters */
static ssize_t portcntrs_debugfs_read(struct file *file, char __user *buf,
				      size_t count, loff_t *ppos)
{
	u64 *counters;
	size_t avail;
	struct hfi1_pportdata *ppd;
	ssize_t rval;

	ppd = private2ppd(file);
	avail = hfi1_read_portcntrs(ppd, NULL, &counters);
	rval = simple_read_from_buffer(buf, count, ppos, counters, avail);
	return rval;
}

static void check_dyn_flag(u64 scratch0, char *p, int size, int *used,
			   int this_hfi, int hfi, u32 flag, const char *what)
{
	u32 mask;

	mask = flag << (hfi ? CR_DYN_SHIFT : 0);
	if (scratch0 & mask) {
		*used += scnprintf(p + *used, size - *used,
				   "  0x%08x - HFI%d %s in use, %s device\n",
				   mask, hfi, what,
				   this_hfi == hfi ? "this" : "other");
	}
}

static ssize_t asic_flags_read(struct file *file, char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd;
	struct hfi1_devdata *dd;
	u64 scratch0;
	char *tmp;
	int ret = 0;
	int size;
	int used;
	int i;

	ppd = private2ppd(file);
	dd = ppd->dd;
	size = PAGE_SIZE;
	used = 0;
	tmp = kmalloc(size, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	used += scnprintf(tmp + used, size - used,
			  "Resource flags: 0x%016llx\n", scratch0);

	/* check permanent flag */
	if (scratch0 & CR_THERM_INIT) {
		used += scnprintf(tmp + used, size - used,
				  "  0x%08x - thermal monitoring initialized\n",
				  (u32)CR_THERM_INIT);
	}

	/* check each dynamic flag on each HFI */
	for (i = 0; i < 2; i++) {
		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
			       CR_SBUS, "SBus");
		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
			       CR_EPROM, "EPROM");
		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
			       CR_I2C1, "i2c chain 1");
		check_dyn_flag(scratch0, tmp, size, &used, dd->hfi1_id, i,
			       CR_I2C2, "i2c chain 2");
	}
	used += scnprintf(tmp + used, size - used, "Write bits to clear\n");

	ret = simple_read_from_buffer(buf, count, ppos, tmp, used);
	kfree(tmp);
	return ret;
}

static ssize_t asic_flags_write(struct file *file, const char __user *buf,
				size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd;
	struct hfi1_devdata *dd;
	char *buff;
	int ret;
	unsigned long long value;
	u64 scratch0;
	u64 clear;

	ppd = private2ppd(file);
	dd = ppd->dd;

	/* zero terminate and read the expected integer */
	buff = memdup_user_nul(buf, count);
	if (IS_ERR(buff))
		return PTR_ERR(buff);

	ret = kstrtoull(buff, 0, &value);
	if (ret)
		goto do_free;
	clear = value;

	/* obtain exclusive access */
	mutex_lock(&dd->asic_data->asic_resource_mutex);
	acquire_hw_mutex(dd);

	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	scratch0 &= ~clear;
	write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
	/* force write to be visible to other HFI on another OS */
	(void)read_csr(dd, ASIC_CFG_SCRATCH);

	release_hw_mutex(dd);
	mutex_unlock(&dd->asic_data->asic_resource_mutex);

	/* return the number of bytes written */
	ret = count;

 do_free:
	kfree(buff);
	return ret;
}

/* read the dc8051 memory */
static ssize_t dc8051_memory_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd = private2ppd(file);
	ssize_t rval;
	void *tmp;
	loff_t start, end;

	/* the checks below expect the position to be positive */
	if (*ppos < 0)
		return -EINVAL;

	tmp = kzalloc(DC8051_DATA_MEM_SIZE, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	/*
	 * Fill in the requested portion of the temporary buffer from the
	 * 8051 memory.  The 8051 memory read is done in terms of 8 bytes.
	 * Adjust start and end to fit.  Skip reading anything if out of
	 * range.
	 */
	start = *ppos & ~0x7;	/* round down */
	if (start < DC8051_DATA_MEM_SIZE) {
		end = (*ppos + count + 7) & ~0x7; /* round up */
		if (end > DC8051_DATA_MEM_SIZE)
			end = DC8051_DATA_MEM_SIZE;
		rval = read_8051_data(ppd->dd, start, end - start,
				      (u64 *)(tmp + start));
		if (rval)
			goto done;
	}

	rval = simple_read_from_buffer(buf, count, ppos, tmp,
				       DC8051_DATA_MEM_SIZE);
done:
	kfree(tmp);
	return rval;
}

static ssize_t debugfs_lcb_read(struct file *file, char __user *buf,
				size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd = private2ppd(file);
	struct hfi1_devdata *dd = ppd->dd;
	unsigned long total, csr_off;
	u64 data;

	if (*ppos < 0)
		return -EINVAL;
	/* only read 8 byte quantities */
	if ((count % 8) != 0)
		return -EINVAL;
	/* offset must be 8-byte aligned */
	if ((*ppos % 8) != 0)
		return -EINVAL;
	/* do nothing if out of range or zero count */
	if (*ppos >= (LCB_END - LCB_START) || !count)
		return 0;
	/* reduce count if needed */
	if (*ppos + count > LCB_END - LCB_START)
		count = (LCB_END - LCB_START) - *ppos;

	csr_off = LCB_START + *ppos;
	for (total = 0; total < count; total += 8, csr_off += 8) {
		if (read_lcb_csr(dd, csr_off, (u64 *)&data))
			break; /* failed */
		if (put_user(data, (unsigned long __user *)(buf + total)))
			break;
	}
	*ppos += total;
	return total;
}

static ssize_t debugfs_lcb_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd = private2ppd(file);
	struct hfi1_devdata *dd = ppd->dd;
	unsigned long total, csr_off, data;

	if (*ppos < 0)
		return -EINVAL;
	/* only write 8 byte quantities */
	if ((count % 8) != 0)
		return -EINVAL;
	/* offset must be 8-byte aligned */
	if ((*ppos % 8) != 0)
		return -EINVAL;
	/* do nothing if out of range or zero count */
	if (*ppos >= (LCB_END - LCB_START) || !count)
		return 0;
	/* reduce count if needed */
	if (*ppos + count > LCB_END - LCB_START)
		count = (LCB_END - LCB_START) - *ppos;

	csr_off = LCB_START + *ppos;
	for (total = 0; total < count; total += 8, csr_off += 8) {
		if (get_user(data, (unsigned long __user *)(buf + total)))
			break;
		if (write_lcb_csr(dd, csr_off, data))
			break; /* failed */
	}
	*ppos += total;
	return total;
}

/*
 * read the per-port QSFP data for ppd
 */
static ssize_t qsfp_debugfs_dump(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	struct hfi1_pportdata *ppd;
	char *tmp;
	int ret;

	ppd = private2ppd(file);
	tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	ret = qsfp_dump(ppd, tmp, PAGE_SIZE);
	if (ret > 0)
		ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
	kfree(tmp);
	return ret;
}

/* Do an i2c write operation on the chain for the given HFI. */
static ssize_t __i2c_debugfs_write(struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos, u32 target)
{
	struct hfi1_pportdata *ppd;
	char *buff;
	int ret;
	int i2c_addr;
	int offset;
	int total_written;

	ppd = private2ppd(file);

	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
	i2c_addr = (*ppos >> 16) & 0xffff;
	offset = *ppos & 0xffff;

	/* explicitly reject invalid address 0 to catch cp and cat */
	if (i2c_addr == 0)
		return -EINVAL;

	buff = memdup_user(buf, count);
	if (IS_ERR(buff))
		return PTR_ERR(buff);

	total_written = i2c_write(ppd, target, i2c_addr, offset, buff, count);
	if (total_written < 0) {
		ret = total_written;
		goto _free;
	}

	*ppos += total_written;

	ret = total_written;

 _free:
	kfree(buff);
	return ret;
}

/* Do an i2c write operation on chain for HFI 0. */
static ssize_t i2c1_debugfs_write(struct file *file, const char __user *buf,
				  size_t count, loff_t *ppos)
{
	return __i2c_debugfs_write(file, buf, count, ppos, 0);
}

/* Do an i2c write operation on chain for HFI 1. */
static ssize_t i2c2_debugfs_write(struct file *file, const char __user *buf,
				  size_t count, loff_t *ppos)
{
	return __i2c_debugfs_write(file, buf, count, ppos, 1);
}

/* Do an i2c read operation on the chain for the given HFI. */
static ssize_t __i2c_debugfs_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos, u32 target)
{
	struct hfi1_pportdata *ppd;
	char *buff;
	int ret;
	int i2c_addr;
	int offset;
	int total_read;

	ppd = private2ppd(file);

	/* byte offset format: [offsetSize][i2cAddr][offsetHigh][offsetLow] */
	i2c_addr = (*ppos >> 16) & 0xffff;
	offset = *ppos & 0xffff;

	/* explicitly reject invalid address 0 to catch cp and cat */
	if (i2c_addr == 0)
		return -EINVAL;

	buff = kmalloc(count, GFP_KERNEL);
	if (!buff)
		return -ENOMEM;

	total_read = i2c_read(ppd, target, i2c_addr, offset, buff, count);
	if (total_read < 0) {
		ret = total_read;
		goto _free;
	}

	*ppos += total_read;

	ret = copy_to_user(buf, buff, total_read);
	if (ret > 0) {
		ret = -EFAULT;
		goto _free;
	}

	ret = total_read;

 _free:
	kfree(buff);
	return ret;
}

/* Do an i2c read operation on chain for HFI 0. */
static ssize_t i2c1_debugfs_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return __i2c_debugfs_read(file, buf, count, ppos, 0);
}

/* Do an i2c read operation on chain for HFI 1. */
static ssize_t i2c2_debugfs_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return __i2c_debugfs_read(file, buf, count, ppos, 1);
}

/* Do a QSFP write operation on the i2c chain for the given HFI. */
static ssize_t __qsfp_debugfs_write(struct file *file, const char __user *buf,
				    size_t count, loff_t *ppos, u32 target)
{
	struct hfi1_pportdata *ppd;
	char *buff;
	int ret;
	int total_written;

	if (*ppos + count > QSFP_PAGESIZE * 4) /* base page + page00-page03 */
		return -EINVAL;

	ppd = private2ppd(file);

	buff = memdup_user(buf, count);
	if (IS_ERR(buff))
		return PTR_ERR(buff);

	total_written = qsfp_write(ppd, target, *ppos, buff, count);
	if (total_written < 0) {
		ret = total_written;
		goto _free;
	}

	*ppos += total_written;

	ret = total_written;

 _free:
	kfree(buff);
	return ret;
}

/* Do a QSFP write operation on i2c chain for HFI 0. */
static ssize_t qsfp1_debugfs_write(struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	return __qsfp_debugfs_write(file, buf, count, ppos, 0);
}

/* Do a QSFP write operation on i2c chain for HFI 1. */
static ssize_t qsfp2_debugfs_write(struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	return __qsfp_debugfs_write(file, buf, count, ppos, 1);
}

/* Do a QSFP read operation on the i2c chain for the given HFI. */
static ssize_t __qsfp_debugfs_read(struct file *file, char __user *buf,
				   size_t count, loff_t *ppos, u32 target)
{
	struct hfi1_pportdata *ppd;
	char *buff;
	int ret;
	int total_read;

	if (*ppos + count > QSFP_PAGESIZE * 4) { /* base page + page00-page03 */
		ret = -EINVAL;
		goto _return;
	}

	ppd = private2ppd(file);

	buff = kmalloc(count, GFP_KERNEL);
	if (!buff) {
		ret = -ENOMEM;
		goto _return;
	}

	total_read = qsfp_read(ppd, target, *ppos, buff, count);
	if (total_read < 0) {
		ret = total_read;
		goto _free;
	}

	*ppos += total_read;

	ret = copy_to_user(buf, buff, total_read);
	if (ret > 0) {
		ret = -EFAULT;
		goto _free;
	}

	ret = total_read;

 _free:
	kfree(buff);
 _return:
	return ret;
}

/* Do a QSFP read operation on i2c chain for HFI 0. */
static ssize_t qsfp1_debugfs_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	return __qsfp_debugfs_read(file, buf, count, ppos, 0);
}

/* Do a QSFP read operation on i2c chain for HFI 1. */
static ssize_t qsfp2_debugfs_read(struct file *file, char __user *buf,
				  size_t count, loff_t *ppos)
{
	return __qsfp_debugfs_read(file, buf, count, ppos, 1);
}

static int __i2c_debugfs_open(struct inode *in, struct file *fp, u32 target)
{
	struct hfi1_pportdata *ppd;
	int ret;

	if (!try_module_get(THIS_MODULE))
		return -ENODEV;

	ppd = private2ppd(fp);

	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
	if (ret) /* failed - release the module */
		module_put(THIS_MODULE);

	return ret;
}

static int i2c1_debugfs_open(struct inode *in, struct file *fp)
{
	return __i2c_debugfs_open(in, fp, 0);
}

static int i2c2_debugfs_open(struct inode *in, struct file *fp)
{
	return __i2c_debugfs_open(in, fp, 1);
}

static int __i2c_debugfs_release(struct inode *in, struct file *fp, u32 target)
{
	struct hfi1_pportdata *ppd;

	ppd = private2ppd(fp);

	release_chip_resource(ppd->dd, i2c_target(target));
	module_put(THIS_MODULE);

	return 0;
}

static int i2c1_debugfs_release(struct inode *in, struct file *fp)
{
	return __i2c_debugfs_release(in, fp, 0);
}

static int i2c2_debugfs_release(struct inode *in, struct file *fp)
{
	return __i2c_debugfs_release(in, fp, 1);
}

static int __qsfp_debugfs_open(struct inode *in, struct file *fp, u32 target)
{
	struct hfi1_pportdata *ppd;
	int ret;

	if (!try_module_get(THIS_MODULE))
		return -ENODEV;

	ppd = private2ppd(fp);

	ret = acquire_chip_resource(ppd->dd, i2c_target(target), 0);
	if (ret) /* failed - release the module */
		module_put(THIS_MODULE);

	return ret;
}

static int qsfp1_debugfs_open(struct inode *in, struct file *fp)
{
	return __qsfp_debugfs_open(in, fp, 0);
}

static int qsfp2_debugfs_open(struct inode *in, struct file *fp)
{
	return __qsfp_debugfs_open(in, fp, 1);
}

static int __qsfp_debugfs_release(struct inode *in, struct file *fp, u32 target)
{
	struct hfi1_pportdata *ppd;

	ppd = private2ppd(fp);

	release_chip_resource(ppd->dd, i2c_target(target));
	module_put(THIS_MODULE);

	return 0;
}

static int qsfp1_debugfs_release(struct inode *in, struct file *fp)
{
	return __qsfp_debugfs_release(in, fp, 0);
}

static int qsfp2_debugfs_release(struct inode *in, struct file *fp)
{
	return __qsfp_debugfs_release(in, fp, 1);
}

#define DEBUGFS_OPS(nm, readroutine, writeroutine)	\
{ \
	.name = nm, \
	.ops = { \
		.read = readroutine, \
		.write = writeroutine, \
		.llseek = generic_file_llseek, \
	}, \
}

#define DEBUGFS_XOPS(nm, readf, writef, openf, releasef) \
{ \
	.name = nm, \
	.ops = { \
		.read = readf, \
		.write = writef, \
		.llseek = generic_file_llseek, \
		.open = openf, \
		.release = releasef \
	}, \
}

static const struct counter_info cntr_ops[] = {
	DEBUGFS_OPS("counter_names", dev_names_read, NULL),
	DEBUGFS_OPS("counters", dev_counters_read, NULL),
	DEBUGFS_OPS("portcounter_names", portnames_read, NULL),
};

static const struct counter_info port_cntr_ops[] = {
	DEBUGFS_OPS("port%dcounters", portcntrs_debugfs_read, NULL),
	DEBUGFS_XOPS("i2c1", i2c1_debugfs_read, i2c1_debugfs_write,
		     i2c1_debugfs_open, i2c1_debugfs_release),
	DEBUGFS_XOPS("i2c2", i2c2_debugfs_read, i2c2_debugfs_write,
		     i2c2_debugfs_open, i2c2_debugfs_release),
	DEBUGFS_OPS("qsfp_dump%d", qsfp_debugfs_dump, NULL),
	DEBUGFS_XOPS("qsfp1", qsfp1_debugfs_read, qsfp1_debugfs_write,
		     qsfp1_debugfs_open, qsfp1_debugfs_release),
	DEBUGFS_XOPS("qsfp2", qsfp2_debugfs_read, qsfp2_debugfs_write,
		     qsfp2_debugfs_open, qsfp2_debugfs_release),
	DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
	DEBUGFS_OPS("dc8051_memory", dc8051_memory_read, NULL),
	DEBUGFS_OPS("lcb", debugfs_lcb_read, debugfs_lcb_write),
};

static void *_sdma_cpu_list_seq_start(struct seq_file *s, loff_t *pos)
{
	if (*pos >= num_online_cpus())
		return NULL;

	return pos;
}

static void *_sdma_cpu_list_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	++*pos;
	if (*pos >= num_online_cpus())
		return NULL;

	return pos;
}

static void _sdma_cpu_list_seq_stop(struct seq_file *s, void *v)
{
	/* nothing allocated */
}

static int _sdma_cpu_list_seq_show(struct seq_file *s, void *v)
{
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);
	loff_t *spos = v;
	loff_t i = *spos;

	sdma_seqfile_dump_cpu_list(s, dd, (unsigned long)i);
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list);
DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list)
DEBUGFS_FILE_OPS(sdma_cpu_list);

#ifdef CONFIG_FAULT_INJECTION
static void *_fault_stats_seq_start(struct seq_file *s, loff_t *pos)
{
	struct hfi1_opcode_stats_perctx *opstats;

	if (*pos >= ARRAY_SIZE(opstats->stats))
		return NULL;
	return pos;
}

static void *_fault_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	struct hfi1_opcode_stats_perctx *opstats;

	++*pos;
	if (*pos >= ARRAY_SIZE(opstats->stats))
		return NULL;
	return pos;
}

static void _fault_stats_seq_stop(struct seq_file *s, void *v)
{
}

static int _fault_stats_seq_show(struct seq_file *s, void *v)
{
	loff_t *spos = v;
	loff_t i = *spos, j;
	u64 n_packets = 0, n_bytes = 0;
	struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
	struct hfi1_devdata *dd = dd_from_dev(ibd);

	for (j = 0; j < dd->first_dyn_alloc_ctxt; j++) {
		if (!dd->rcd[j])
			continue;
		n_packets += dd->rcd[j]->opstats->stats[i].n_packets;
		n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes;
	}
	if (!n_packets && !n_bytes)
		return SEQ_SKIP;
	if (!ibd->fault_opcode->n_rxfaults[i] &&
	    !ibd->fault_opcode->n_txfaults[i])
		return SEQ_SKIP;
	seq_printf(s, "%02llx %llu/%llu (faults rx:%llu faults: tx:%llu)\n", i,
		   (unsigned long long)n_packets,
		   (unsigned long long)n_bytes,
		   (unsigned long long)ibd->fault_opcode->n_rxfaults[i],
		   (unsigned long long)ibd->fault_opcode->n_txfaults[i]);
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(fault_stats);
DEBUGFS_SEQ_FILE_OPEN(fault_stats);
DEBUGFS_FILE_OPS(fault_stats);

static void fault_exit_opcode_debugfs(struct hfi1_ibdev *ibd)
{
	debugfs_remove_recursive(ibd->fault_opcode->dir);
	kfree(ibd->fault_opcode);
	ibd->fault_opcode = NULL;
}

static int fault_init_opcode_debugfs(struct hfi1_ibdev *ibd)
{
	struct dentry *parent = ibd->hfi1_ibdev_dbg;

	ibd->fault_opcode = kzalloc(sizeof(*ibd->fault_opcode), GFP_KERNEL);
	if (!ibd->fault_opcode)
		return -ENOMEM;

	ibd->fault_opcode->attr.interval = 1;
	ibd->fault_opcode->attr.require_end = ULONG_MAX;
	ibd->fault_opcode->attr.stacktrace_depth = 32;
	ibd->fault_opcode->attr.dname = NULL;
	ibd->fault_opcode->attr.verbose = 0;
	ibd->fault_opcode->fault_by_opcode = false;
	ibd->fault_opcode->opcode = 0;
	ibd->fault_opcode->mask = 0xff;

	ibd->fault_opcode->dir =
		fault_create_debugfs_attr("fault_opcode",
					  parent,
					  &ibd->fault_opcode->attr);
	if (IS_ERR(ibd->fault_opcode->dir)) {
		kfree(ibd->fault_opcode);
		return -ENOENT;
	}

	DEBUGFS_SEQ_FILE_CREATE(fault_stats, ibd->fault_opcode->dir, ibd);
	if (!debugfs_create_bool("fault_by_opcode", 0600,
				 ibd->fault_opcode->dir,
				 &ibd->fault_opcode->fault_by_opcode))
		goto fail;
	if (!debugfs_create_x8("opcode", 0600, ibd->fault_opcode->dir,
			       &ibd->fault_opcode->opcode))
		goto fail;
	if (!debugfs_create_x8("mask", 0600, ibd->fault_opcode->dir,
			       &ibd->fault_opcode->mask))
		goto fail;

	return 0;
fail:
	fault_exit_opcode_debugfs(ibd);
	return -ENOMEM;
}

static void fault_exit_packet_debugfs(struct hfi1_ibdev *ibd)
{
	debugfs_remove_recursive(ibd->fault_packet->dir);
	kfree(ibd->fault_packet);
	ibd->fault_packet = NULL;
}

static int fault_init_packet_debugfs(struct hfi1_ibdev *ibd)
{
	struct dentry *parent = ibd->hfi1_ibdev_dbg;

	ibd->fault_packet = kzalloc(sizeof(*ibd->fault_packet), GFP_KERNEL);
	if (!ibd->fault_packet)
		return -ENOMEM;

	ibd->fault_packet->attr.interval = 1;
	ibd->fault_packet->attr.require_end = ULONG_MAX;
	ibd->fault_packet->attr.stacktrace_depth = 32;
	ibd->fault_packet->attr.dname = NULL;
	ibd->fault_packet->attr.verbose = 0;
	ibd->fault_packet->fault_by_packet = false;

	ibd->fault_packet->dir =
		fault_create_debugfs_attr("fault_packet",
					  parent,
					  &ibd->fault_opcode->attr);
	if (IS_ERR(ibd->fault_packet->dir)) {
		kfree(ibd->fault_packet);
		return -ENOENT;
	}

	if (!debugfs_create_bool("fault_by_packet", 0600,
				 ibd->fault_packet->dir,
				 &ibd->fault_packet->fault_by_packet))
		goto fail;
	if (!debugfs_create_u64("fault_stats", 0400,
				ibd->fault_packet->dir,
				&ibd->fault_packet->n_faults))
		goto fail;

	return 0;
fail:
	fault_exit_packet_debugfs(ibd);
	return -ENOMEM;
}

static void fault_exit_debugfs(struct hfi1_ibdev *ibd)
{
	fault_exit_opcode_debugfs(ibd);
	fault_exit_packet_debugfs(ibd);
}

static int fault_init_debugfs(struct hfi1_ibdev *ibd)
{
	int ret = 0;

	ret = fault_init_opcode_debugfs(ibd);
	if (ret)
		return ret;

	ret = fault_init_packet_debugfs(ibd);
	if (ret)
		fault_exit_opcode_debugfs(ibd);

	return ret;
}

bool hfi1_dbg_fault_suppress_err(struct hfi1_ibdev *ibd)
{
	return ibd->fault_suppress_err;
}

bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, u32 opcode, bool rx)
{
	bool ret = false;
	struct hfi1_ibdev *ibd = to_idev(qp->ibqp.device);

	if (!ibd->fault_opcode || !ibd->fault_opcode->fault_by_opcode)
		return false;
	if (ibd->fault_opcode->opcode != (opcode & ibd->fault_opcode->mask))
		return false;
	ret = should_fail(&ibd->fault_opcode->attr, 1);
	if (ret) {
		trace_hfi1_fault_opcode(qp, opcode);
		if (rx)
			ibd->fault_opcode->n_rxfaults[opcode]++;
		else
			ibd->fault_opcode->n_txfaults[opcode]++;
	}
	return ret;
}

bool hfi1_dbg_fault_packet(struct hfi1_packet *packet)
{
	struct rvt_dev_info *rdi = &packet->rcd->ppd->dd->verbs_dev.rdi;
	struct hfi1_ibdev *ibd = dev_from_rdi(rdi);
	bool ret = false;

	if (!ibd->fault_packet || !ibd->fault_packet->fault_by_packet)
		return false;

	ret = should_fail(&ibd->fault_packet->attr, 1);
	if (ret) {
		++ibd->fault_packet->n_faults;
		trace_hfi1_fault_packet(packet);
	}
	return ret;
}
#endif

void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
{
	char name[sizeof("port0counters") + 1];
	char link[10];
	struct hfi1_devdata *dd = dd_from_dev(ibd);
	struct hfi1_pportdata *ppd;
	int unit = dd->unit;
	int i, j;

	if (!hfi1_dbg_root)
		return;
	snprintf(name, sizeof(name), "%s_%d", class_name(), unit);
	snprintf(link, sizeof(link), "%d", unit);
	ibd->hfi1_ibdev_dbg = debugfs_create_dir(name, hfi1_dbg_root);
	if (!ibd->hfi1_ibdev_dbg) {
		pr_warn("create of %s failed\n", name);
		return;
	}
	ibd->hfi1_ibdev_link =
		debugfs_create_symlink(link, hfi1_dbg_root, name);
	if (!ibd->hfi1_ibdev_link) {
		pr_warn("create of %s symlink failed\n", name);
		return;
	}
	DEBUGFS_SEQ_FILE_CREATE(opcode_stats, ibd->hfi1_ibdev_dbg, ibd);
	DEBUGFS_SEQ_FILE_CREATE(ctx_stats, ibd->hfi1_ibdev_dbg, ibd);
	DEBUGFS_SEQ_FILE_CREATE(qp_stats, ibd->hfi1_ibdev_dbg, ibd);
	DEBUGFS_SEQ_FILE_CREATE(sdes, ibd->hfi1_ibdev_dbg, ibd);
	DEBUGFS_SEQ_FILE_CREATE(sdma_cpu_list, ibd->hfi1_ibdev_dbg, ibd);
	/* dev counter files */
	for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
		DEBUGFS_FILE_CREATE(cntr_ops[i].name,
				    ibd->hfi1_ibdev_dbg,
				    dd,
				    &cntr_ops[i].ops, S_IRUGO);
	/* per port files */
	for (ppd = dd->pport, j = 0; j < dd->num_pports; j++, ppd++)
		for (i = 0; i < ARRAY_SIZE(port_cntr_ops); i++) {
			snprintf(name,
				 sizeof(name),
				 port_cntr_ops[i].name,
				 j + 1);
			DEBUGFS_FILE_CREATE(name,
					    ibd->hfi1_ibdev_dbg,
					    ppd,
					    &port_cntr_ops[i].ops,
					    !port_cntr_ops[i].ops.write ?
					    S_IRUGO : S_IRUGO | S_IWUSR);
		}

#ifdef CONFIG_FAULT_INJECTION
	debugfs_create_bool("fault_suppress_err", 0600,
			    ibd->hfi1_ibdev_dbg,
			    &ibd->fault_suppress_err);
	fault_init_debugfs(ibd);
#endif
}

void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd)
{
	if (!hfi1_dbg_root)
		goto out;
#ifdef CONFIG_FAULT_INJECTION
	fault_exit_debugfs(ibd);
#endif
	debugfs_remove(ibd->hfi1_ibdev_link);
	debugfs_remove_recursive(ibd->hfi1_ibdev_dbg);
out:
	ibd->hfi1_ibdev_dbg = NULL;
}

/*
 * driver stats field names, one line per stat, single string.  Used by
 * programs like hfistats to print the stats in a way which works for
 * different versions of drivers, without changing program source.
 * if hfi1_ib_stats changes, this needs to change.  Names need to be
 * 12 chars or less (w/o newline), for proper display by hfistats utility.
 */
static const char * const hfi1_statnames[] = {
	/* must be element 0*/
	"KernIntr",
	"ErrorIntr",
	"Tx_Errs",
	"Rcv_Errs",
	"H/W_Errs",
	"NoPIOBufs",
	"CtxtsOpen",
	"RcvLen_Errs",
	"EgrBufFull",
	"EgrHdrFull"
};

static void *_driver_stats_names_seq_start(struct seq_file *s, loff_t *pos)
{
	if (*pos >= ARRAY_SIZE(hfi1_statnames))
		return NULL;
	return pos;
}

static void *_driver_stats_names_seq_next(
	struct seq_file *s,
	void *v,
	loff_t *pos)
{
	++*pos;
	if (*pos >= ARRAY_SIZE(hfi1_statnames))
		return NULL;
	return pos;
}

static void _driver_stats_names_seq_stop(struct seq_file *s, void *v)
{
}

static int _driver_stats_names_seq_show(struct seq_file *s, void *v)
{
	loff_t *spos = v;

	seq_printf(s, "%s\n", hfi1_statnames[*spos]);
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(driver_stats_names);
DEBUGFS_SEQ_FILE_OPEN(driver_stats_names)
DEBUGFS_FILE_OPS(driver_stats_names);

static void *_driver_stats_seq_start(struct seq_file *s, loff_t *pos)
{
	if (*pos >= ARRAY_SIZE(hfi1_statnames))
		return NULL;
	return pos;
}

static void *_driver_stats_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	++*pos;
	if (*pos >= ARRAY_SIZE(hfi1_statnames))
		return NULL;
	return pos;
}

static void _driver_stats_seq_stop(struct seq_file *s, void *v)
{
}

static u64 hfi1_sps_ints(void)
{
	unsigned long flags;
	struct hfi1_devdata *dd;
	u64 sps_ints = 0;

	spin_lock_irqsave(&hfi1_devs_lock, flags);
	list_for_each_entry(dd, &hfi1_dev_list, list) {
		sps_ints += get_all_cpu_total(dd->int_counter);
	}
	spin_unlock_irqrestore(&hfi1_devs_lock, flags);
	return sps_ints;
}

static int _driver_stats_seq_show(struct seq_file *s, void *v)
{
	loff_t *spos = v;
	char *buffer;
	u64 *stats = (u64 *)&hfi1_stats;
	size_t sz = seq_get_buf(s, &buffer);

	if (sz < sizeof(u64))
		return SEQ_SKIP;
	/* special case for interrupts */
	if (*spos == 0)
		*(u64 *)buffer = hfi1_sps_ints();
	else
		*(u64 *)buffer = stats[*spos];
	seq_commit(s,  sizeof(u64));
	return 0;
}

DEBUGFS_SEQ_FILE_OPS(driver_stats);
DEBUGFS_SEQ_FILE_OPEN(driver_stats)
DEBUGFS_FILE_OPS(driver_stats);

void hfi1_dbg_init(void)
{
	hfi1_dbg_root  = debugfs_create_dir(DRIVER_NAME, NULL);
	if (!hfi1_dbg_root)
		pr_warn("init of debugfs failed\n");
	DEBUGFS_SEQ_FILE_CREATE(driver_stats_names, hfi1_dbg_root, NULL);
	DEBUGFS_SEQ_FILE_CREATE(driver_stats, hfi1_dbg_root, NULL);
}

void hfi1_dbg_exit(void)
{
	debugfs_remove_recursive(hfi1_dbg_root);
	hfi1_dbg_root = NULL;
}

#endif