summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/snic/snic_debugfs.c
blob: 1686f019625178fe5064688c6f0ef920489588ce (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
/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/debugfs.h>

#include "snic.h"

/*
 * snic_debugfs_init - Initialize debugfs for snic debug logging
 *
 * Description:
 * When Debugfs is configured this routine sets up fnic debugfs
 * filesystem. If not already created. this routine will crate the
 * fnic directory and statistics directory for trace buffer and
 * stats logging
 */

int
snic_debugfs_init(void)
{
	int rc = -1;
	struct dentry *de = NULL;

	de = debugfs_create_dir("snic", NULL);
	if (!de) {
		SNIC_DBG("Cannot create debugfs root\n");

		return rc;
	}
	snic_glob->trc_root = de;

	de = debugfs_create_dir("statistics", snic_glob->trc_root);
	if (!de) {
		SNIC_DBG("Cannot create Statistics directory\n");

		return rc;
	}
	snic_glob->stats_root = de;

	rc = 0;

	return rc;
} /* end of snic_debugfs_init */

/*
 * snic_debugfs_term - Tear down debugfs intrastructure
 *
 * Description:
 * When Debufs is configured this routine removes debugfs file system
 * elements that are specific to snic
 */
void
snic_debugfs_term(void)
{
	debugfs_remove(snic_glob->stats_root);
	snic_glob->stats_root = NULL;

	debugfs_remove(snic_glob->trc_root);
	snic_glob->trc_root = NULL;
}

/*
 * snic_reset_stats_open - Open the reset_stats file
 */
static int
snic_reset_stats_open(struct inode *inode, struct file *filp)
{
	SNIC_BUG_ON(!inode->i_private);
	filp->private_data = inode->i_private;

	return 0;
}

/*
 * snic_reset_stats_read - Read a reset_stats debugfs file
 * @filp: The file pointer to read from.
 * @ubuf: The buffer tocopy the data to.
 * @cnt: The number of bytes to read.
 * @ppos: The position in the file to start reading frm.
 *
 * Description:
 * This routine reads value of variable reset_stats
 * and stores into local @buf. It will start reading file @ppos and
 * copy up to @cnt of data to @ubuf from @buf.
 *
 * Returns:
 * This function returns the amount of data that was read.
 */
static ssize_t
snic_reset_stats_read(struct file *filp,
		      char __user *ubuf,
		      size_t cnt,
		      loff_t *ppos)
{
	struct snic *snic = (struct snic *) filp->private_data;
	char buf[64];
	int len;

	len = sprintf(buf, "%u\n", snic->reset_stats);

	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
}

/*
 * snic_reset_stats_write - Write to reset_stats debugfs file
 * @filp: The file pointer to write from
 * @ubuf: The buffer to copy the data from.
 * @cnt: The number of bytes to write.
 * @ppos: The position in the file to start writing to.
 *
 * Description:
 * This routine writes data from user buffer @ubuf to buffer @buf and
 * resets cumulative stats of snic.
 *
 * Returns:
 * This function returns the amount of data that was written.
 */
static ssize_t
snic_reset_stats_write(struct file *filp,
		       const char __user *ubuf,
		       size_t cnt,
		       loff_t *ppos)
{
	struct snic *snic = (struct snic *) filp->private_data;
	struct snic_stats *stats = &snic->s_stats;
	u64 *io_stats_p = (u64 *) &stats->io;
	u64 *fw_stats_p = (u64 *) &stats->fw;
	char buf[64];
	unsigned long val;
	int ret;

	if (cnt >= sizeof(buf))
		return -EINVAL;

	if (copy_from_user(&buf, ubuf, cnt))
		return -EFAULT;

	buf[cnt] = '\0';

	ret = kstrtoul(buf, 10, &val);
	if (ret < 0)
		return ret;

	snic->reset_stats = val;

	if (snic->reset_stats) {
		/* Skip variable is used to avoid descrepancies to Num IOs
		 * and IO Completions stats. Skip incrementing No IO Compls
		 * for pending active IOs after reset_stats
		 */
		atomic64_set(&snic->io_cmpl_skip,
			     atomic64_read(&stats->io.active));
		memset(&stats->abts, 0, sizeof(struct snic_abort_stats));
		memset(&stats->reset, 0, sizeof(struct snic_reset_stats));
		memset(&stats->misc, 0, sizeof(struct snic_misc_stats));
		memset(io_stats_p+1,
			0,
			sizeof(struct snic_io_stats) - sizeof(u64));
		memset(fw_stats_p+1,
			0,
			sizeof(struct snic_fw_stats) - sizeof(u64));
	}

	(*ppos)++;

	SNIC_HOST_INFO(snic->shost, "Reset Op: Driver statistics.\n");

	return cnt;
}

static int
snic_reset_stats_release(struct inode *inode, struct file *filp)
{
	filp->private_data = NULL;

	return 0;
}

/*
 * snic_stats_show - Formats and prints per host specific driver stats.
 */
static int
snic_stats_show(struct seq_file *sfp, void *data)
{
	struct snic *snic = (struct snic *) sfp->private;
	struct snic_stats *stats = &snic->s_stats;
	struct timespec last_isr_tms, last_ack_tms;
	u64 maxio_tm;
	int i;

	/* Dump IO Stats */
	seq_printf(sfp,
		   "------------------------------------------\n"
		   "\t\t IO Statistics\n"
		   "------------------------------------------\n");

	maxio_tm = (u64) atomic64_read(&stats->io.max_time);
	seq_printf(sfp,
		   "Active IOs                  : %lld\n"
		   "Max Active IOs              : %lld\n"
		   "Total IOs                   : %lld\n"
		   "IOs Completed               : %lld\n"
		   "IOs Failed                  : %lld\n"
		   "IOs Not Found               : %lld\n"
		   "Memory Alloc Failures       : %lld\n"
		   "REQs Null                   : %lld\n"
		   "SCSI Cmd Pointers Null      : %lld\n"
		   "Max SGL for any IO          : %lld\n"
		   "Max IO Size                 : %lld Sectors\n"
		   "Max Queuing Time            : %lld\n"
		   "Max Completion Time         : %lld\n"
		   "Max IO Process Time(FW)     : %lld (%u msec)\n",
		   (u64) atomic64_read(&stats->io.active),
		   (u64) atomic64_read(&stats->io.max_active),
		   (u64) atomic64_read(&stats->io.num_ios),
		   (u64) atomic64_read(&stats->io.compl),
		   (u64) atomic64_read(&stats->io.fail),
		   (u64) atomic64_read(&stats->io.io_not_found),
		   (u64) atomic64_read(&stats->io.alloc_fail),
		   (u64) atomic64_read(&stats->io.req_null),
		   (u64) atomic64_read(&stats->io.sc_null),
		   (u64) atomic64_read(&stats->io.max_sgl),
		   (u64) atomic64_read(&stats->io.max_io_sz),
		   (u64) atomic64_read(&stats->io.max_qtime),
		   (u64) atomic64_read(&stats->io.max_cmpl_time),
		   maxio_tm,
		   jiffies_to_msecs(maxio_tm));

	seq_puts(sfp, "\nSGL Counters\n");

	for (i = 0; i < SNIC_MAX_SG_DESC_CNT; i++) {
		seq_printf(sfp,
			   "%10lld ",
			   (u64) atomic64_read(&stats->io.sgl_cnt[i]));

		if ((i + 1) % 8 == 0)
			seq_puts(sfp, "\n");
	}

	/* Dump Abort Stats */
	seq_printf(sfp,
		   "\n-------------------------------------------\n"
		   "\t\t Abort Statistics\n"
		   "---------------------------------------------\n");

	seq_printf(sfp,
		   "Aborts                      : %lld\n"
		   "Aborts Fail                 : %lld\n"
		   "Aborts Driver Timeout       : %lld\n"
		   "Abort FW Timeout            : %lld\n"
		   "Abort IO NOT Found          : %lld\n",
		   (u64) atomic64_read(&stats->abts.num),
		   (u64) atomic64_read(&stats->abts.fail),
		   (u64) atomic64_read(&stats->abts.drv_tmo),
		   (u64) atomic64_read(&stats->abts.fw_tmo),
		   (u64) atomic64_read(&stats->abts.io_not_found));

	/* Dump Reset Stats */
	seq_printf(sfp,
		   "\n-------------------------------------------\n"
		   "\t\t Reset Statistics\n"
		   "---------------------------------------------\n");

	seq_printf(sfp,
		   "HBA Resets                  : %lld\n"
		   "HBA Reset Cmpls             : %lld\n"
		   "HBA Reset Fail              : %lld\n",
		   (u64) atomic64_read(&stats->reset.hba_resets),
		   (u64) atomic64_read(&stats->reset.hba_reset_cmpl),
		   (u64) atomic64_read(&stats->reset.hba_reset_fail));

	/* Dump Firmware Stats */
	seq_printf(sfp,
		   "\n-------------------------------------------\n"
		   "\t\t Firmware Statistics\n"
		   "---------------------------------------------\n");

	seq_printf(sfp,
		"Active FW Requests             : %lld\n"
		"Max FW Requests                : %lld\n"
		"FW Out Of Resource Errs        : %lld\n"
		"FW IO Errors                   : %lld\n"
		"FW SCSI Errors                 : %lld\n",
		(u64) atomic64_read(&stats->fw.actv_reqs),
		(u64) atomic64_read(&stats->fw.max_actv_reqs),
		(u64) atomic64_read(&stats->fw.out_of_res),
		(u64) atomic64_read(&stats->fw.io_errs),
		(u64) atomic64_read(&stats->fw.scsi_errs));


	/* Dump Miscellenous Stats */
	seq_printf(sfp,
		   "\n---------------------------------------------\n"
		   "\t\t Other Statistics\n"
		   "\n---------------------------------------------\n");

	jiffies_to_timespec(stats->misc.last_isr_time, &last_isr_tms);
	jiffies_to_timespec(stats->misc.last_ack_time, &last_ack_tms);

	seq_printf(sfp,
		   "Last ISR Time               : %llu (%8lu.%8lu)\n"
		   "Last Ack Time               : %llu (%8lu.%8lu)\n"
		   "ISRs                        : %llu\n"
		   "Max CQ Entries              : %lld\n"
		   "Data Count Mismatch         : %lld\n"
		   "IOs w/ Timeout Status       : %lld\n"
		   "IOs w/ Aborted Status       : %lld\n"
		   "IOs w/ SGL Invalid Stat     : %lld\n"
		   "WQ Desc Alloc Fail          : %lld\n"
		   "Queue Full                  : %lld\n"
		   "Target Not Ready            : %lld\n",
		   (u64) stats->misc.last_isr_time,
		   last_isr_tms.tv_sec, last_isr_tms.tv_nsec,
		   (u64)stats->misc.last_ack_time,
		   last_ack_tms.tv_sec, last_ack_tms.tv_nsec,
		   (u64) atomic64_read(&stats->misc.isr_cnt),
		   (u64) atomic64_read(&stats->misc.max_cq_ents),
		   (u64) atomic64_read(&stats->misc.data_cnt_mismat),
		   (u64) atomic64_read(&stats->misc.io_tmo),
		   (u64) atomic64_read(&stats->misc.io_aborted),
		   (u64) atomic64_read(&stats->misc.sgl_inval),
		   (u64) atomic64_read(&stats->misc.wq_alloc_fail),
		   (u64) atomic64_read(&stats->misc.qfull),
		   (u64) atomic64_read(&stats->misc.tgt_not_rdy));

	return 0;
}

/*
 * snic_stats_open - Open the stats file for specific host
 *
 * Description:
 * This routine opens a debugfs file stats of specific host
 */
static int
snic_stats_open(struct inode *inode, struct file *filp)
{
	return single_open(filp, snic_stats_show, inode->i_private);
}

static const struct file_operations snic_stats_fops = {
	.owner	= THIS_MODULE,
	.open	= snic_stats_open,
	.read	= seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static const struct file_operations snic_reset_stats_fops = {
	.owner = THIS_MODULE,
	.open = snic_reset_stats_open,
	.read = snic_reset_stats_read,
	.write = snic_reset_stats_write,
	.release = snic_reset_stats_release,
};

/*
 * snic_stats_init - Initialize stats struct and create stats file
 * per snic
 *
 * Description:
 * When debugfs is cofigured this routine sets up the stats file per snic
 * It will create file stats and reset_stats under statistics/host# directory
 * to log per snic stats
 */
int
snic_stats_debugfs_init(struct snic *snic)
{
	int rc = -1;
	char name[16];
	struct dentry *de = NULL;

	snprintf(name, sizeof(name), "host%d", snic->shost->host_no);
	if (!snic_glob->stats_root) {
		SNIC_DBG("snic_stats root doesn't exist\n");

		return rc;
	}

	de = debugfs_create_dir(name, snic_glob->stats_root);
	if (!de) {
		SNIC_DBG("Cannot create host directory\n");

		return rc;
	}
	snic->stats_host = de;

	de = debugfs_create_file("stats",
				S_IFREG|S_IRUGO,
				snic->stats_host,
				snic,
				&snic_stats_fops);
	if (!de) {
		SNIC_DBG("Cannot create host's stats file\n");

		return rc;
	}
	snic->stats_file = de;

	de = debugfs_create_file("reset_stats",
				S_IFREG|S_IRUGO|S_IWUSR,
				snic->stats_host,
				snic,
				&snic_reset_stats_fops);

	if (!de) {
		SNIC_DBG("Cannot create host's reset_stats file\n");

		return rc;
	}
	snic->reset_stats_file = de;
	rc = 0;

	return rc;
} /* end of snic_stats_debugfs_init */

/*
 * snic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
 *
 * Description:
 * When Debufs is configured this routine removes debugfs file system
 * elements that are specific to to snic stats
 */
void
snic_stats_debugfs_remove(struct snic *snic)
{
	debugfs_remove(snic->stats_file);
	snic->stats_file = NULL;

	debugfs_remove(snic->reset_stats_file);
	snic->reset_stats_file = NULL;

	debugfs_remove(snic->stats_host);
	snic->stats_host = NULL;
}

/* Trace Facility related API */
static void *
snic_trc_seq_start(struct seq_file *sfp, loff_t *pos)
{
	return &snic_glob->trc;
}

static void *
snic_trc_seq_next(struct seq_file *sfp, void *data, loff_t *pos)
{
	return NULL;
}

static void
snic_trc_seq_stop(struct seq_file *sfp, void *data)
{
}

#define SNIC_TRC_PBLEN	256
static int
snic_trc_seq_show(struct seq_file *sfp, void *data)
{
	char buf[SNIC_TRC_PBLEN];

	if (snic_get_trc_data(buf, SNIC_TRC_PBLEN) > 0)
		seq_printf(sfp, "%s\n", buf);

	return 0;
}

static const struct seq_operations snic_trc_seq_ops = {
	.start	= snic_trc_seq_start,
	.next	= snic_trc_seq_next,
	.stop	= snic_trc_seq_stop,
	.show	= snic_trc_seq_show,
};

static int
snic_trc_open(struct inode *inode, struct file *filp)
{
	return seq_open(filp, &snic_trc_seq_ops);
}

static const struct file_operations snic_trc_fops = {
	.owner	= THIS_MODULE,
	.open	= snic_trc_open,
	.read	= seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

/*
 * snic_trc_debugfs_init : creates trace/tracing_enable files for trace
 * under debugfs
 */
int
snic_trc_debugfs_init(void)
{
	struct dentry *de = NULL;
	int ret = -1;

	if (!snic_glob->trc_root) {
		SNIC_ERR("Debugfs root directory for snic doesn't exist.\n");

		return ret;
	}

	de = debugfs_create_bool("tracing_enable",
				 S_IFREG | S_IRUGO | S_IWUSR,
				 snic_glob->trc_root,
				 &snic_glob->trc.enable);

	if (!de) {
		SNIC_ERR("Can't create trace_enable file.\n");

		return ret;
	}
	snic_glob->trc.trc_enable = de;

	de = debugfs_create_file("trace",
				 S_IFREG | S_IRUGO | S_IWUSR,
				 snic_glob->trc_root,
				 NULL,
				 &snic_trc_fops);

	if (!de) {
		SNIC_ERR("Cann't create trace file.\n");

		return ret;
	}
	snic_glob->trc.trc_file = de;
	ret = 0;

	return ret;
} /* end of snic_trc_debugfs_init */

/*
 * snic_trc_debugfs_term : cleans up the files created for trace under debugfs
 */
void
snic_trc_debugfs_term(void)
{
	debugfs_remove(snic_glob->trc.trc_file);
	snic_glob->trc.trc_file = NULL;

	debugfs_remove(snic_glob->trc.trc_enable);
	snic_glob->trc.trc_enable = NULL;
}