summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/fnic/fnic_trace.c
blob: e002e7187dc0d14972b7146ce9ea15b1e5dbdd4e (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
/*
 * Copyright 2012 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/mempool.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include "fnic_io.h"
#include "fnic.h"

unsigned int trace_max_pages;
static int fnic_max_trace_entries;

static unsigned long fnic_trace_buf_p;
static DEFINE_SPINLOCK(fnic_trace_lock);

static fnic_trace_dbg_t fnic_trace_entries;
int fnic_tracing_enabled = 1;

/*
 * fnic_trace_get_buf - Give buffer pointer to user to fill up trace information
 *
 * Description:
 * This routine gets next available trace buffer entry location @wr_idx
 * from allocated trace buffer pages and give that memory location
 * to user to store the trace information.
 *
 * Return Value:
 * This routine returns pointer to next available trace entry
 * @fnic_buf_head for user to fill trace information.
 */
fnic_trace_data_t *fnic_trace_get_buf(void)
{
	unsigned long fnic_buf_head;
	unsigned long flags;

	spin_lock_irqsave(&fnic_trace_lock, flags);

	/*
	 * Get next available memory location for writing trace information
	 * at @wr_idx and increment @wr_idx
	 */
	fnic_buf_head =
		fnic_trace_entries.page_offset[fnic_trace_entries.wr_idx];
	fnic_trace_entries.wr_idx++;

	/*
	 * Verify if trace buffer is full then change wd_idx to
	 * start from zero
	 */
	if (fnic_trace_entries.wr_idx >= fnic_max_trace_entries)
		fnic_trace_entries.wr_idx = 0;

	/*
	 * Verify if write index @wr_idx and read index @rd_idx are same then
	 * increment @rd_idx to move to next entry in trace buffer
	 */
	if (fnic_trace_entries.wr_idx == fnic_trace_entries.rd_idx) {
		fnic_trace_entries.rd_idx++;
		if (fnic_trace_entries.rd_idx >= fnic_max_trace_entries)
			fnic_trace_entries.rd_idx = 0;
	}
	spin_unlock_irqrestore(&fnic_trace_lock, flags);
	return (fnic_trace_data_t *)fnic_buf_head;
}

/*
 * fnic_get_trace_data - Copy trace buffer to a memory file
 * @fnic_dbgfs_t: pointer to debugfs trace buffer
 *
 * Description:
 * This routine gathers the fnic trace debugfs data from the fnic_trace_data_t
 * buffer and dumps it to fnic_dbgfs_t. It will start at the rd_idx entry in
 * the log and process the log until the end of the buffer. Then it will gather
 * from the beginning of the log and process until the current entry @wr_idx.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into fnic_dbgfs_t
 */
int fnic_get_trace_data(fnic_dbgfs_t *fnic_dbgfs_prt)
{
	int rd_idx;
	int wr_idx;
	int len = 0;
	unsigned long flags;
	char str[KSYM_SYMBOL_LEN];
	struct timespec val;
	fnic_trace_data_t *tbp;

	spin_lock_irqsave(&fnic_trace_lock, flags);
	rd_idx = fnic_trace_entries.rd_idx;
	wr_idx = fnic_trace_entries.wr_idx;
	if (wr_idx < rd_idx) {
		while (1) {
			/* Start from read index @rd_idx */
			tbp = (fnic_trace_data_t *)
				  fnic_trace_entries.page_offset[rd_idx];
			if (!tbp) {
				spin_unlock_irqrestore(&fnic_trace_lock, flags);
				return 0;
			}
			/* Convert function pointer to function name */
			if (sizeof(unsigned long) < 8) {
				sprint_symbol(str, tbp->fnaddr.low);
				jiffies_to_timespec(tbp->timestamp.low, &val);
			} else {
				sprint_symbol(str, tbp->fnaddr.val);
				jiffies_to_timespec(tbp->timestamp.val, &val);
			}
			/*
			 * Dump trace buffer entry to memory file
			 * and increment read index @rd_idx
			 */
			len += snprintf(fnic_dbgfs_prt->buffer + len,
				  (trace_max_pages * PAGE_SIZE * 3) - len,
				  "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
				  "%16llx %16llx %16llx\n", val.tv_sec,
				  val.tv_nsec, str, tbp->host_no, tbp->tag,
				  tbp->data[0], tbp->data[1], tbp->data[2],
				  tbp->data[3], tbp->data[4]);
			rd_idx++;
			/*
			 * If rd_idx is reached to maximum trace entries
			 * then move rd_idx to zero
			 */
			if (rd_idx > (fnic_max_trace_entries-1))
				rd_idx = 0;
			/*
			 * Continure dumpping trace buffer entries into
			 * memory file till rd_idx reaches write index
			 */
			if (rd_idx == wr_idx)
				break;
		}
	} else if (wr_idx > rd_idx) {
		while (1) {
			/* Start from read index @rd_idx */
			tbp = (fnic_trace_data_t *)
				  fnic_trace_entries.page_offset[rd_idx];
			if (!tbp) {
				spin_unlock_irqrestore(&fnic_trace_lock, flags);
				return 0;
			}
			/* Convert function pointer to function name */
			if (sizeof(unsigned long) < 8) {
				sprint_symbol(str, tbp->fnaddr.low);
				jiffies_to_timespec(tbp->timestamp.low, &val);
			} else {
				sprint_symbol(str, tbp->fnaddr.val);
				jiffies_to_timespec(tbp->timestamp.val, &val);
			}
			/*
			 * Dump trace buffer entry to memory file
			 * and increment read index @rd_idx
			 */
			len += snprintf(fnic_dbgfs_prt->buffer + len,
				  (trace_max_pages * PAGE_SIZE * 3) - len,
				  "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
				  "%16llx %16llx %16llx\n", val.tv_sec,
				  val.tv_nsec, str, tbp->host_no, tbp->tag,
				  tbp->data[0], tbp->data[1], tbp->data[2],
				  tbp->data[3], tbp->data[4]);
			rd_idx++;
			/*
			 * Continue dumpping trace buffer entries into
			 * memory file till rd_idx reaches write index
			 */
			if (rd_idx == wr_idx)
				break;
		}
	}
	spin_unlock_irqrestore(&fnic_trace_lock, flags);
	return len;
}

/*
 * fnic_get_stats_data - Copy fnic stats buffer to a memory file
 * @fnic_dbgfs_t: pointer to debugfs fnic stats buffer
 *
 * Description:
 * This routine gathers the fnic stats debugfs data from the fnic_stats struct
 * and dumps it to stats_debug_info.
 *
 * Return Value:
 * This routine returns the amount of bytes that were dumped into
 * stats_debug_info
 */
int fnic_get_stats_data(struct stats_debug_info *debug,
			struct fnic_stats *stats)
{
	int len = 0;
	int buf_size = debug->buf_size;
	struct timespec val1, val2;

	len = snprintf(debug->debug_buffer + len, buf_size - len,
		  "------------------------------------------\n"
		  "\t\tIO Statistics\n"
		  "------------------------------------------\n");
	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Active IOs: %lld\nMaximum Active IOs: %lld\n"
		  "Number of IOs: %lld\nNumber of IO Completions: %lld\n"
		  "Number of IO Failures: %lld\nNumber of IO NOT Found: %lld\n"
		  "Number of Memory alloc Failures: %lld\n"
		  "Number of IOREQ Null: %lld\n"
		  "Number of SCSI cmd pointer Null: %lld\n",
		  (u64)atomic64_read(&stats->io_stats.active_ios),
		  (u64)atomic64_read(&stats->io_stats.max_active_ios),
		  (u64)atomic64_read(&stats->io_stats.num_ios),
		  (u64)atomic64_read(&stats->io_stats.io_completions),
		  (u64)atomic64_read(&stats->io_stats.io_failures),
		  (u64)atomic64_read(&stats->io_stats.io_not_found),
		  (u64)atomic64_read(&stats->io_stats.alloc_failures),
		  (u64)atomic64_read(&stats->io_stats.ioreq_null),
		  (u64)atomic64_read(&stats->io_stats.sc_null));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tAbort Statistics\n"
		  "------------------------------------------\n");
	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Aborts: %lld\n"
		  "Number of Abort Failures: %lld\n"
		  "Number of Abort Driver Timeouts: %lld\n"
		  "Number of Abort FW Timeouts: %lld\n"
		  "Number of Abort IO NOT Found: %lld\n",
		  (u64)atomic64_read(&stats->abts_stats.aborts),
		  (u64)atomic64_read(&stats->abts_stats.abort_failures),
		  (u64)atomic64_read(&stats->abts_stats.abort_drv_timeouts),
		  (u64)atomic64_read(&stats->abts_stats.abort_fw_timeouts),
		  (u64)atomic64_read(&stats->abts_stats.abort_io_not_found));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tTerminate Statistics\n"
		  "------------------------------------------\n");
	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Terminates: %lld\n"
		  "Maximum Terminates: %lld\n"
		  "Number of Terminate Driver Timeouts: %lld\n"
		  "Number of Terminate FW Timeouts: %lld\n"
		  "Number of Terminate IO NOT Found: %lld\n"
		  "Number of Terminate Failures: %lld\n",
		  (u64)atomic64_read(&stats->term_stats.terminates),
		  (u64)atomic64_read(&stats->term_stats.max_terminates),
		  (u64)atomic64_read(&stats->term_stats.terminate_drv_timeouts),
		  (u64)atomic64_read(&stats->term_stats.terminate_fw_timeouts),
		  (u64)atomic64_read(&stats->term_stats.terminate_io_not_found),
		  (u64)atomic64_read(&stats->term_stats.terminate_failures));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tReset Statistics\n"
		  "------------------------------------------\n");

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Device Resets: %lld\n"
		  "Number of Device Reset Failures: %lld\n"
		  "Number of Device Reset Aborts: %lld\n"
		  "Number of Device Reset Timeouts: %lld\n"
		  "Number of Device Reset Terminates: %lld\n"
		  "Number of FW Resets: %lld\n"
		  "Number of FW Reset Completions: %lld\n"
		  "Number of FW Reset Failures: %lld\n"
		  "Number of Fnic Reset: %lld\n"
		  "Number of Fnic Reset Completions: %lld\n"
		  "Number of Fnic Reset Failures: %lld\n",
		  (u64)atomic64_read(&stats->reset_stats.device_resets),
		  (u64)atomic64_read(&stats->reset_stats.device_reset_failures),
		  (u64)atomic64_read(&stats->reset_stats.device_reset_aborts),
		  (u64)atomic64_read(&stats->reset_stats.device_reset_timeouts),
		  (u64)atomic64_read(
			  &stats->reset_stats.device_reset_terminates),
		  (u64)atomic64_read(&stats->reset_stats.fw_resets),
		  (u64)atomic64_read(&stats->reset_stats.fw_reset_completions),
		  (u64)atomic64_read(&stats->reset_stats.fw_reset_failures),
		  (u64)atomic64_read(&stats->reset_stats.fnic_resets),
		  (u64)atomic64_read(
			  &stats->reset_stats.fnic_reset_completions),
		  (u64)atomic64_read(&stats->reset_stats.fnic_reset_failures));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tFirmware Statistics\n"
		  "------------------------------------------\n");

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Active FW Requests %lld\n"
		  "Maximum FW Requests: %lld\n"
		  "Number of FW out of resources: %lld\n"
		  "Number of FW IO errors: %lld\n",
		  (u64)atomic64_read(&stats->fw_stats.active_fw_reqs),
		  (u64)atomic64_read(&stats->fw_stats.max_fw_reqs),
		  (u64)atomic64_read(&stats->fw_stats.fw_out_of_resources),
		  (u64)atomic64_read(&stats->fw_stats.io_fw_errs));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tVlan Discovery Statistics\n"
		  "------------------------------------------\n");

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Number of Vlan Discovery Requests Sent %lld\n"
		  "Vlan Response Received with no FCF VLAN ID: %lld\n"
		  "No solicitations recvd after vlan set, expiry count: %lld\n"
		  "Flogi rejects count: %lld\n",
		  (u64)atomic64_read(&stats->vlan_stats.vlan_disc_reqs),
		  (u64)atomic64_read(&stats->vlan_stats.resp_withno_vlanID),
		  (u64)atomic64_read(&stats->vlan_stats.sol_expiry_count),
		  (u64)atomic64_read(&stats->vlan_stats.flogi_rejects));

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "\n------------------------------------------\n"
		  "\t\tOther Important Statistics\n"
		  "------------------------------------------\n");

	jiffies_to_timespec(stats->misc_stats.last_isr_time, &val1);
	jiffies_to_timespec(stats->misc_stats.last_ack_time, &val2);

	len += snprintf(debug->debug_buffer + len, buf_size - len,
		  "Last ISR time: %llu (%8lu.%8lu)\n"
		  "Last ACK time: %llu (%8lu.%8lu)\n"
		  "Number of ISRs: %lld\n"
		  "Maximum CQ Entries: %lld\n"
		  "Number of ACK index out of range: %lld\n"
		  "Number of data count mismatch: %lld\n"
		  "Number of FCPIO Timeouts: %lld\n"
		  "Number of FCPIO Aborted: %lld\n"
		  "Number of SGL Invalid: %lld\n"
		  "Number of Copy WQ Alloc Failures for ABTs: %lld\n"
		  "Number of Copy WQ Alloc Failures for Device Reset: %lld\n"
		  "Number of Copy WQ Alloc Failures for IOs: %lld\n"
		  "Number of no icmnd itmf Completions: %lld\n"
		  "Number of QUEUE Fulls: %lld\n"
		  "Number of rport not ready: %lld\n"
		  "Number of receive frame errors: %lld\n",
		  (u64)stats->misc_stats.last_isr_time,
		  val1.tv_sec, val1.tv_nsec,
		  (u64)stats->misc_stats.last_ack_time,
		  val2.tv_sec, val2.tv_nsec,
		  (u64)atomic64_read(&stats->misc_stats.isr_count),
		  (u64)atomic64_read(&stats->misc_stats.max_cq_entries),
		  (u64)atomic64_read(&stats->misc_stats.ack_index_out_of_range),
		  (u64)atomic64_read(&stats->misc_stats.data_count_mismatch),
		  (u64)atomic64_read(&stats->misc_stats.fcpio_timeout),
		  (u64)atomic64_read(&stats->misc_stats.fcpio_aborted),
		  (u64)atomic64_read(&stats->misc_stats.sgl_invalid),
		  (u64)atomic64_read(
			  &stats->misc_stats.abts_cpwq_alloc_failures),
		  (u64)atomic64_read(
			  &stats->misc_stats.devrst_cpwq_alloc_failures),
		  (u64)atomic64_read(&stats->misc_stats.io_cpwq_alloc_failures),
		  (u64)atomic64_read(&stats->misc_stats.no_icmnd_itmf_cmpls),
		  (u64)atomic64_read(&stats->misc_stats.queue_fulls),
		  (u64)atomic64_read(&stats->misc_stats.rport_not_ready),
		  (u64)atomic64_read(&stats->misc_stats.frame_errors));

	return len;

}

/*
 * fnic_trace_buf_init - Initialize fnic trace buffer logging facility
 *
 * Description:
 * Initialize trace buffer data structure by allocating required memory and
 * setting page_offset information for every trace entry by adding trace entry
 * length to previous page_offset value.
 */
int fnic_trace_buf_init(void)
{
	unsigned long fnic_buf_head;
	int i;
	int err = 0;

	trace_max_pages = fnic_trace_max_pages;
	fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
					  FNIC_ENTRY_SIZE_BYTES;

	fnic_trace_buf_p = (unsigned long)vmalloc((trace_max_pages * PAGE_SIZE));
	if (!fnic_trace_buf_p) {
		printk(KERN_ERR PFX "Failed to allocate memory "
				  "for fnic_trace_buf_p\n");
		err = -ENOMEM;
		goto err_fnic_trace_buf_init;
	}
	memset((void *)fnic_trace_buf_p, 0, (trace_max_pages * PAGE_SIZE));

	fnic_trace_entries.page_offset = vmalloc(fnic_max_trace_entries *
						  sizeof(unsigned long));
	if (!fnic_trace_entries.page_offset) {
		printk(KERN_ERR PFX "Failed to allocate memory for"
				  " page_offset\n");
		if (fnic_trace_buf_p) {
			vfree((void *)fnic_trace_buf_p);
			fnic_trace_buf_p = 0;
		}
		err = -ENOMEM;
		goto err_fnic_trace_buf_init;
	}
	memset((void *)fnic_trace_entries.page_offset, 0,
		  (fnic_max_trace_entries * sizeof(unsigned long)));
	fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
	fnic_buf_head = fnic_trace_buf_p;

	/*
	 * Set page_offset field of fnic_trace_entries struct by
	 * calculating memory location for every trace entry using
	 * length of each trace entry
	 */
	for (i = 0; i < fnic_max_trace_entries; i++) {
		fnic_trace_entries.page_offset[i] = fnic_buf_head;
		fnic_buf_head += FNIC_ENTRY_SIZE_BYTES;
	}
	err = fnic_trace_debugfs_init();
	if (err < 0) {
		printk(KERN_ERR PFX "Failed to initialize debugfs for tracing\n");
		goto err_fnic_trace_debugfs_init;
	}
	printk(KERN_INFO PFX "Successfully Initialized Trace Buffer\n");
	return err;
err_fnic_trace_debugfs_init:
	fnic_trace_free();
err_fnic_trace_buf_init:
	return err;
}

/*
 * fnic_trace_free - Free memory of fnic trace data structures.
 */
void fnic_trace_free(void)
{
	fnic_tracing_enabled = 0;
	fnic_trace_debugfs_terminate();
	if (fnic_trace_entries.page_offset) {
		vfree((void *)fnic_trace_entries.page_offset);
		fnic_trace_entries.page_offset = NULL;
	}
	if (fnic_trace_buf_p) {
		vfree((void *)fnic_trace_buf_p);
		fnic_trace_buf_p = 0;
	}
	printk(KERN_INFO PFX "Successfully Freed Trace Buffer\n");
}
OpenPOWER on IntegriCloud