xref: /openbmc/linux/drivers/scsi/fnic/fnic_debugfs.c (revision 76fed8a4)
1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright 2012 Cisco Systems, Inc.  All rights reserved.
3 
4 #include <linux/module.h>
5 #include <linux/errno.h>
6 #include <linux/debugfs.h>
7 #include <linux/vmalloc.h>
8 #include "fnic.h"
9 
10 static struct dentry *fnic_trace_debugfs_root;
11 static struct dentry *fnic_trace_debugfs_file;
12 static struct dentry *fnic_trace_enable;
13 static struct dentry *fnic_stats_debugfs_root;
14 
15 static struct dentry *fnic_fc_trace_debugfs_file;
16 static struct dentry *fnic_fc_rdata_trace_debugfs_file;
17 static struct dentry *fnic_fc_trace_enable;
18 static struct dentry *fnic_fc_trace_clear;
19 
20 struct fc_trace_flag_type {
21 	u8 fc_row_file;
22 	u8 fc_normal_file;
23 	u8 fnic_trace;
24 	u8 fc_trace;
25 	u8 fc_clear;
26 };
27 
28 static struct fc_trace_flag_type *fc_trc_flag;
29 
30 /*
31  * fnic_debugfs_init - Initialize debugfs for fnic debug logging
32  *
33  * Description:
34  * When Debugfs is configured this routine sets up the fnic debugfs
35  * file system. If not already created, this routine will create the
36  * fnic directory and statistics directory for trace buffer and
37  * stats logging.
38  */
fnic_debugfs_init(void)39 int fnic_debugfs_init(void)
40 {
41 	fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
42 
43 	fnic_stats_debugfs_root = debugfs_create_dir("statistics",
44 						fnic_trace_debugfs_root);
45 
46 	/* Allocate memory to structure */
47 	fc_trc_flag = vmalloc(sizeof(struct fc_trace_flag_type));
48 
49 	if (fc_trc_flag) {
50 		fc_trc_flag->fc_row_file = 0;
51 		fc_trc_flag->fc_normal_file = 1;
52 		fc_trc_flag->fnic_trace = 2;
53 		fc_trc_flag->fc_trace = 3;
54 		fc_trc_flag->fc_clear = 4;
55 		return 0;
56 	}
57 
58 	return -ENOMEM;
59 }
60 
61 /*
62  * fnic_debugfs_terminate - Tear down debugfs infrastructure
63  *
64  * Description:
65  * When Debugfs is configured this routine removes debugfs file system
66  * elements that are specific to fnic.
67  */
fnic_debugfs_terminate(void)68 void fnic_debugfs_terminate(void)
69 {
70 	debugfs_remove(fnic_stats_debugfs_root);
71 	fnic_stats_debugfs_root = NULL;
72 
73 	debugfs_remove(fnic_trace_debugfs_root);
74 	fnic_trace_debugfs_root = NULL;
75 
76 	vfree(fc_trc_flag);
77 }
78 
79 /*
80  * fnic_trace_ctrl_read -
81  *          Read  trace_enable ,fc_trace_enable
82  *              or fc_trace_clear debugfs file
83  * @filp: The file pointer to read from.
84  * @ubuf: The buffer to copy the data to.
85  * @cnt: The number of bytes to read.
86  * @ppos: The position in the file to start reading from.
87  *
88  * Description:
89  * This routine reads value of variable fnic_tracing_enabled or
90  * fnic_fc_tracing_enabled or fnic_fc_trace_cleared
91  * and stores into local @buf.
92  * It will start reading file at @ppos and
93  * copy up to @cnt of data to @ubuf from @buf.
94  *
95  * Returns:
96  * This function returns the amount of data that was read.
97  */
fnic_trace_ctrl_read(struct file * filp,char __user * ubuf,size_t cnt,loff_t * ppos)98 static ssize_t fnic_trace_ctrl_read(struct file *filp,
99 				  char __user *ubuf,
100 				  size_t cnt, loff_t *ppos)
101 {
102 	char buf[64];
103 	int len;
104 	u8 *trace_type;
105 	len = 0;
106 	trace_type = (u8 *)filp->private_data;
107 	if (*trace_type == fc_trc_flag->fnic_trace)
108 		len = sprintf(buf, "%d\n", fnic_tracing_enabled);
109 	else if (*trace_type == fc_trc_flag->fc_trace)
110 		len = sprintf(buf, "%d\n", fnic_fc_tracing_enabled);
111 	else if (*trace_type == fc_trc_flag->fc_clear)
112 		len = sprintf(buf, "%d\n", fnic_fc_trace_cleared);
113 	else
114 		pr_err("fnic: Cannot read to any debugfs file\n");
115 
116 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
117 }
118 
119 /*
120  * fnic_trace_ctrl_write -
121  * Write to trace_enable, fc_trace_enable or
122  *         fc_trace_clear debugfs file
123  * @filp: The file pointer to write from.
124  * @ubuf: The buffer to copy the data from.
125  * @cnt: The number of bytes to write.
126  * @ppos: The position in the file to start writing to.
127  *
128  * Description:
129  * This routine writes data from user buffer @ubuf to buffer @buf and
130  * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared
131  * value as per user input.
132  *
133  * Returns:
134  * This function returns the amount of data that was written.
135  */
fnic_trace_ctrl_write(struct file * filp,const char __user * ubuf,size_t cnt,loff_t * ppos)136 static ssize_t fnic_trace_ctrl_write(struct file *filp,
137 				  const char __user *ubuf,
138 				  size_t cnt, loff_t *ppos)
139 {
140 	char buf[64];
141 	unsigned long val;
142 	int ret;
143 	u8 *trace_type;
144 	trace_type = (u8 *)filp->private_data;
145 
146 	if (cnt >= sizeof(buf))
147 		return -EINVAL;
148 
149 	if (copy_from_user(&buf, ubuf, cnt))
150 		return -EFAULT;
151 
152 	buf[cnt] = 0;
153 
154 	ret = kstrtoul(buf, 10, &val);
155 	if (ret < 0)
156 		return ret;
157 
158 	if (*trace_type == fc_trc_flag->fnic_trace)
159 		fnic_tracing_enabled = val;
160 	else if (*trace_type == fc_trc_flag->fc_trace)
161 		fnic_fc_tracing_enabled = val;
162 	else if (*trace_type == fc_trc_flag->fc_clear)
163 		fnic_fc_trace_cleared = val;
164 	else
165 		pr_err("fnic: cannot write to any debugfs file\n");
166 
167 	(*ppos)++;
168 
169 	return cnt;
170 }
171 
172 static const struct file_operations fnic_trace_ctrl_fops = {
173 	.owner = THIS_MODULE,
174 	.open = simple_open,
175 	.read = fnic_trace_ctrl_read,
176 	.write = fnic_trace_ctrl_write,
177 };
178 
179 /*
180  * fnic_trace_debugfs_open - Open the fnic trace log
181  * @inode: The inode pointer
182  * @file: The file pointer to attach the log output
183  *
184  * Description:
185  * This routine is the entry point for the debugfs open file operation.
186  * It allocates the necessary buffer for the log, fills the buffer from
187  * the in-memory log and then returns a pointer to that log in
188  * the private_data field in @file.
189  *
190  * Returns:
191  * This function returns zero if successful. On error it will return
192  * a negative error value.
193  */
fnic_trace_debugfs_open(struct inode * inode,struct file * file)194 static int fnic_trace_debugfs_open(struct inode *inode,
195 				  struct file *file)
196 {
197 	fnic_dbgfs_t *fnic_dbg_prt;
198 	u8 *rdata_ptr;
199 	rdata_ptr = (u8 *)inode->i_private;
200 	fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL);
201 	if (!fnic_dbg_prt)
202 		return -ENOMEM;
203 
204 	if (*rdata_ptr == fc_trc_flag->fnic_trace) {
205 		fnic_dbg_prt->buffer = vzalloc(array3_size(3, trace_max_pages,
206 							   PAGE_SIZE));
207 		if (!fnic_dbg_prt->buffer) {
208 			kfree(fnic_dbg_prt);
209 			return -ENOMEM;
210 		}
211 		fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
212 	} else {
213 		fnic_dbg_prt->buffer =
214 			vzalloc(array3_size(3, fnic_fc_trace_max_pages,
215 					    PAGE_SIZE));
216 		if (!fnic_dbg_prt->buffer) {
217 			kfree(fnic_dbg_prt);
218 			return -ENOMEM;
219 		}
220 		fnic_dbg_prt->buffer_len =
221 			fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr);
222 	}
223 	file->private_data = fnic_dbg_prt;
224 
225 	return 0;
226 }
227 
228 /*
229  * fnic_trace_debugfs_lseek - Seek through a debugfs file
230  * @file: The file pointer to seek through.
231  * @offset: The offset to seek to or the amount to seek by.
232  * @howto: Indicates how to seek.
233  *
234  * Description:
235  * This routine is the entry point for the debugfs lseek file operation.
236  * The @howto parameter indicates whether @offset is the offset to directly
237  * seek to, or if it is a value to seek forward or reverse by. This function
238  * figures out what the new offset of the debugfs file will be and assigns
239  * that value to the f_pos field of @file.
240  *
241  * Returns:
242  * This function returns the new offset if successful and returns a negative
243  * error if unable to process the seek.
244  */
fnic_trace_debugfs_lseek(struct file * file,loff_t offset,int howto)245 static loff_t fnic_trace_debugfs_lseek(struct file *file,
246 					loff_t offset,
247 					int howto)
248 {
249 	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
250 	return fixed_size_llseek(file, offset, howto,
251 				fnic_dbg_prt->buffer_len);
252 }
253 
254 /*
255  * fnic_trace_debugfs_read - Read a debugfs file
256  * @file: The file pointer to read from.
257  * @ubuf: The buffer to copy the data to.
258  * @nbytes: The number of bytes to read.
259  * @pos: The position in the file to start reading from.
260  *
261  * Description:
262  * This routine reads data from the buffer indicated in the private_data
263  * field of @file. It will start reading at @pos and copy up to @nbytes of
264  * data to @ubuf.
265  *
266  * Returns:
267  * This function returns the amount of data that was read (this could be
268  * less than @nbytes if the end of the file was reached).
269  */
fnic_trace_debugfs_read(struct file * file,char __user * ubuf,size_t nbytes,loff_t * pos)270 static ssize_t fnic_trace_debugfs_read(struct file *file,
271 					char __user *ubuf,
272 					size_t nbytes,
273 					loff_t *pos)
274 {
275 	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
276 	int rc = 0;
277 	rc = simple_read_from_buffer(ubuf, nbytes, pos,
278 				  fnic_dbg_prt->buffer,
279 				  fnic_dbg_prt->buffer_len);
280 	return rc;
281 }
282 
283 /*
284  * fnic_trace_debugfs_release - Release the buffer used to store
285  * debugfs file data
286  * @inode: The inode pointer
287  * @file: The file pointer that contains the buffer to release
288  *
289  * Description:
290  * This routine frees the buffer that was allocated when the debugfs
291  * file was opened.
292  *
293  * Returns:
294  * This function returns zero.
295  */
fnic_trace_debugfs_release(struct inode * inode,struct file * file)296 static int fnic_trace_debugfs_release(struct inode *inode,
297 					  struct file *file)
298 {
299 	fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
300 
301 	vfree(fnic_dbg_prt->buffer);
302 	kfree(fnic_dbg_prt);
303 	return 0;
304 }
305 
306 static const struct file_operations fnic_trace_debugfs_fops = {
307 	.owner = THIS_MODULE,
308 	.open = fnic_trace_debugfs_open,
309 	.llseek = fnic_trace_debugfs_lseek,
310 	.read = fnic_trace_debugfs_read,
311 	.release = fnic_trace_debugfs_release,
312 };
313 
314 /*
315  * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
316  *
317  * Description:
318  * When Debugfs is configured this routine sets up the fnic debugfs
319  * file system. If not already created, this routine will create the
320  * create file trace to log fnic trace buffer output into debugfs and
321  * it will also create file trace_enable to control enable/disable of
322  * trace logging into trace buffer.
323  */
fnic_trace_debugfs_init(void)324 void fnic_trace_debugfs_init(void)
325 {
326 	fnic_trace_enable = debugfs_create_file("tracing_enable",
327 					S_IFREG|S_IRUGO|S_IWUSR,
328 					fnic_trace_debugfs_root,
329 					&(fc_trc_flag->fnic_trace),
330 					&fnic_trace_ctrl_fops);
331 
332 	fnic_trace_debugfs_file = debugfs_create_file("trace",
333 					S_IFREG|S_IRUGO|S_IWUSR,
334 					fnic_trace_debugfs_root,
335 					&(fc_trc_flag->fnic_trace),
336 					&fnic_trace_debugfs_fops);
337 }
338 
339 /*
340  * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
341  *
342  * Description:
343  * When Debugfs is configured this routine removes debugfs file system
344  * elements that are specific to fnic trace logging.
345  */
fnic_trace_debugfs_terminate(void)346 void fnic_trace_debugfs_terminate(void)
347 {
348 	debugfs_remove(fnic_trace_debugfs_file);
349 	fnic_trace_debugfs_file = NULL;
350 
351 	debugfs_remove(fnic_trace_enable);
352 	fnic_trace_enable = NULL;
353 }
354 
355 /*
356  * fnic_fc_trace_debugfs_init -
357  * Initialize debugfs for fnic control frame trace logging
358  *
359  * Description:
360  * When Debugfs is configured this routine sets up the fnic_fc debugfs
361  * file system. If not already created, this routine will create the
362  * create file trace to log fnic fc trace buffer output into debugfs and
363  * it will also create file fc_trace_enable to control enable/disable of
364  * trace logging into trace buffer.
365  */
366 
fnic_fc_trace_debugfs_init(void)367 void fnic_fc_trace_debugfs_init(void)
368 {
369 	fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable",
370 					S_IFREG|S_IRUGO|S_IWUSR,
371 					fnic_trace_debugfs_root,
372 					&(fc_trc_flag->fc_trace),
373 					&fnic_trace_ctrl_fops);
374 
375 	fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear",
376 					S_IFREG|S_IRUGO|S_IWUSR,
377 					fnic_trace_debugfs_root,
378 					&(fc_trc_flag->fc_clear),
379 					&fnic_trace_ctrl_fops);
380 
381 	fnic_fc_rdata_trace_debugfs_file =
382 		debugfs_create_file("fc_trace_rdata",
383 				    S_IFREG|S_IRUGO|S_IWUSR,
384 				    fnic_trace_debugfs_root,
385 				    &(fc_trc_flag->fc_normal_file),
386 				    &fnic_trace_debugfs_fops);
387 
388 	fnic_fc_trace_debugfs_file =
389 		debugfs_create_file("fc_trace",
390 				    S_IFREG|S_IRUGO|S_IWUSR,
391 				    fnic_trace_debugfs_root,
392 				    &(fc_trc_flag->fc_row_file),
393 				    &fnic_trace_debugfs_fops);
394 }
395 
396 /*
397  * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure
398  *
399  * Description:
400  * When Debugfs is configured this routine removes debugfs file system
401  * elements that are specific to fnic_fc trace logging.
402  */
403 
fnic_fc_trace_debugfs_terminate(void)404 void fnic_fc_trace_debugfs_terminate(void)
405 {
406 	debugfs_remove(fnic_fc_trace_debugfs_file);
407 	fnic_fc_trace_debugfs_file = NULL;
408 
409 	debugfs_remove(fnic_fc_rdata_trace_debugfs_file);
410 	fnic_fc_rdata_trace_debugfs_file = NULL;
411 
412 	debugfs_remove(fnic_fc_trace_enable);
413 	fnic_fc_trace_enable = NULL;
414 
415 	debugfs_remove(fnic_fc_trace_clear);
416 	fnic_fc_trace_clear = NULL;
417 }
418 
419 /*
420  * fnic_reset_stats_open - Open the reset_stats file
421  * @inode: The inode pointer.
422  * @file: The file pointer to attach the stats reset flag.
423  *
424  * Description:
425  * This routine opens a debugsfs file reset_stats and stores i_private data
426  * to debug structure to retrieve later for while performing other
427  * file oprations.
428  *
429  * Returns:
430  * This function returns zero if successful.
431  */
fnic_reset_stats_open(struct inode * inode,struct file * file)432 static int fnic_reset_stats_open(struct inode *inode, struct file *file)
433 {
434 	struct stats_debug_info *debug;
435 
436 	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
437 	if (!debug)
438 		return -ENOMEM;
439 
440 	debug->i_private = inode->i_private;
441 
442 	file->private_data = debug;
443 
444 	return 0;
445 }
446 
447 /*
448  * fnic_reset_stats_read - Read a reset_stats debugfs file
449  * @filp: The file pointer to read from.
450  * @ubuf: The buffer to copy the data to.
451  * @cnt: The number of bytes to read.
452  * @ppos: The position in the file to start reading from.
453  *
454  * Description:
455  * This routine reads value of variable reset_stats
456  * and stores into local @buf. It will start reading file at @ppos and
457  * copy up to @cnt of data to @ubuf from @buf.
458  *
459  * Returns:
460  * This function returns the amount of data that was read.
461  */
fnic_reset_stats_read(struct file * file,char __user * ubuf,size_t cnt,loff_t * ppos)462 static ssize_t fnic_reset_stats_read(struct file *file,
463 					char __user *ubuf,
464 					size_t cnt, loff_t *ppos)
465 {
466 	struct stats_debug_info *debug = file->private_data;
467 	struct fnic *fnic = (struct fnic *)debug->i_private;
468 	char buf[64];
469 	int len;
470 
471 	len = sprintf(buf, "%u\n", fnic->reset_stats);
472 
473 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
474 }
475 
476 /*
477  * fnic_reset_stats_write - Write to reset_stats debugfs file
478  * @filp: The file pointer to write from.
479  * @ubuf: The buffer to copy the data from.
480  * @cnt: The number of bytes to write.
481  * @ppos: The position in the file to start writing to.
482  *
483  * Description:
484  * This routine writes data from user buffer @ubuf to buffer @buf and
485  * resets cumulative stats of fnic.
486  *
487  * Returns:
488  * This function returns the amount of data that was written.
489  */
fnic_reset_stats_write(struct file * file,const char __user * ubuf,size_t cnt,loff_t * ppos)490 static ssize_t fnic_reset_stats_write(struct file *file,
491 					const char __user *ubuf,
492 					size_t cnt, loff_t *ppos)
493 {
494 	struct stats_debug_info *debug = file->private_data;
495 	struct fnic *fnic = (struct fnic *)debug->i_private;
496 	struct fnic_stats *stats = &fnic->fnic_stats;
497 	u64 *io_stats_p = (u64 *)&stats->io_stats;
498 	u64 *fw_stats_p = (u64 *)&stats->fw_stats;
499 	char buf[64];
500 	unsigned long val;
501 	int ret;
502 
503 	if (cnt >= sizeof(buf))
504 		return -EINVAL;
505 
506 	if (copy_from_user(&buf, ubuf, cnt))
507 		return -EFAULT;
508 
509 	buf[cnt] = 0;
510 
511 	ret = kstrtoul(buf, 10, &val);
512 	if (ret < 0)
513 		return ret;
514 
515 	fnic->reset_stats = val;
516 
517 	if (fnic->reset_stats) {
518 		/* Skip variable is used to avoid descrepancies to Num IOs
519 		 * and IO Completions stats. Skip incrementing No IO Compls
520 		 * for pending active IOs after reset stats
521 		 */
522 		atomic64_set(&fnic->io_cmpl_skip,
523 			atomic64_read(&stats->io_stats.active_ios));
524 		memset(&stats->abts_stats, 0, sizeof(struct abort_stats));
525 		memset(&stats->term_stats, 0,
526 			sizeof(struct terminate_stats));
527 		memset(&stats->reset_stats, 0, sizeof(struct reset_stats));
528 		memset(&stats->misc_stats, 0, sizeof(struct misc_stats));
529 		memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats));
530 		memset(io_stats_p+1, 0,
531 			sizeof(struct io_path_stats) - sizeof(u64));
532 		memset(fw_stats_p+1, 0,
533 			sizeof(struct fw_stats) - sizeof(u64));
534 		ktime_get_real_ts64(&stats->stats_timestamps.last_reset_time);
535 	}
536 
537 	(*ppos)++;
538 	return cnt;
539 }
540 
541 /*
542  * fnic_reset_stats_release - Release the buffer used to store
543  * debugfs file data
544  * @inode: The inode pointer
545  * @file: The file pointer that contains the buffer to release
546  *
547  * Description:
548  * This routine frees the buffer that was allocated when the debugfs
549  * file was opened.
550  *
551  * Returns:
552  * This function returns zero.
553  */
fnic_reset_stats_release(struct inode * inode,struct file * file)554 static int fnic_reset_stats_release(struct inode *inode,
555 					struct file *file)
556 {
557 	struct stats_debug_info *debug = file->private_data;
558 	kfree(debug);
559 	return 0;
560 }
561 
562 /*
563  * fnic_stats_debugfs_open - Open the stats file for specific host
564  * and get fnic stats.
565  * @inode: The inode pointer.
566  * @file: The file pointer to attach the specific host statistics.
567  *
568  * Description:
569  * This routine opens a debugsfs file stats of specific host and print
570  * fnic stats.
571  *
572  * Returns:
573  * This function returns zero if successful.
574  */
fnic_stats_debugfs_open(struct inode * inode,struct file * file)575 static int fnic_stats_debugfs_open(struct inode *inode,
576 					struct file *file)
577 {
578 	struct fnic *fnic = inode->i_private;
579 	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
580 	struct stats_debug_info *debug;
581 	int buf_size = 2 * PAGE_SIZE;
582 
583 	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
584 	if (!debug)
585 		return -ENOMEM;
586 
587 	debug->debug_buffer = vmalloc(buf_size);
588 	if (!debug->debug_buffer) {
589 		kfree(debug);
590 		return -ENOMEM;
591 	}
592 
593 	debug->buf_size = buf_size;
594 	memset((void *)debug->debug_buffer, 0, buf_size);
595 	debug->buffer_len = fnic_get_stats_data(debug, fnic_stats);
596 
597 	file->private_data = debug;
598 
599 	return 0;
600 }
601 
602 /*
603  * fnic_stats_debugfs_read - Read a debugfs file
604  * @file: The file pointer to read from.
605  * @ubuf: The buffer to copy the data to.
606  * @nbytes: The number of bytes to read.
607  * @pos: The position in the file to start reading from.
608  *
609  * Description:
610  * This routine reads data from the buffer indicated in the private_data
611  * field of @file. It will start reading at @pos and copy up to @nbytes of
612  * data to @ubuf.
613  *
614  * Returns:
615  * This function returns the amount of data that was read (this could be
616  * less than @nbytes if the end of the file was reached).
617  */
fnic_stats_debugfs_read(struct file * file,char __user * ubuf,size_t nbytes,loff_t * pos)618 static ssize_t fnic_stats_debugfs_read(struct file *file,
619 					char __user *ubuf,
620 					size_t nbytes,
621 					loff_t *pos)
622 {
623 	struct stats_debug_info *debug = file->private_data;
624 	int rc = 0;
625 	rc = simple_read_from_buffer(ubuf, nbytes, pos,
626 					debug->debug_buffer,
627 					debug->buffer_len);
628 	return rc;
629 }
630 
631 /*
632  * fnic_stats_stats_release - Release the buffer used to store
633  * debugfs file data
634  * @inode: The inode pointer
635  * @file: The file pointer that contains the buffer to release
636  *
637  * Description:
638  * This routine frees the buffer that was allocated when the debugfs
639  * file was opened.
640  *
641  * Returns:
642  * This function returns zero.
643  */
fnic_stats_debugfs_release(struct inode * inode,struct file * file)644 static int fnic_stats_debugfs_release(struct inode *inode,
645 					struct file *file)
646 {
647 	struct stats_debug_info *debug = file->private_data;
648 	vfree(debug->debug_buffer);
649 	kfree(debug);
650 	return 0;
651 }
652 
653 static const struct file_operations fnic_stats_debugfs_fops = {
654 	.owner = THIS_MODULE,
655 	.open = fnic_stats_debugfs_open,
656 	.read = fnic_stats_debugfs_read,
657 	.release = fnic_stats_debugfs_release,
658 };
659 
660 static const struct file_operations fnic_reset_debugfs_fops = {
661 	.owner = THIS_MODULE,
662 	.open = fnic_reset_stats_open,
663 	.read = fnic_reset_stats_read,
664 	.write = fnic_reset_stats_write,
665 	.release = fnic_reset_stats_release,
666 };
667 
668 /*
669  * fnic_stats_init - Initialize stats struct and create stats file per fnic
670  *
671  * Description:
672  * When Debugfs is configured this routine sets up the stats file per fnic
673  * It will create file stats and reset_stats under statistics/host# directory
674  * to log per fnic stats.
675  */
fnic_stats_debugfs_init(struct fnic * fnic)676 void fnic_stats_debugfs_init(struct fnic *fnic)
677 {
678 	char name[16];
679 
680 	snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no);
681 
682 	fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
683 						fnic_stats_debugfs_root);
684 
685 	fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
686 						S_IFREG|S_IRUGO|S_IWUSR,
687 						fnic->fnic_stats_debugfs_host,
688 						fnic,
689 						&fnic_stats_debugfs_fops);
690 
691 	fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
692 						S_IFREG|S_IRUGO|S_IWUSR,
693 						fnic->fnic_stats_debugfs_host,
694 						fnic,
695 						&fnic_reset_debugfs_fops);
696 }
697 
698 /*
699  * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
700  *
701  * Description:
702  * When Debugfs is configured this routine removes debugfs file system
703  * elements that are specific to fnic stats.
704  */
fnic_stats_debugfs_remove(struct fnic * fnic)705 void fnic_stats_debugfs_remove(struct fnic *fnic)
706 {
707 	if (!fnic)
708 		return;
709 
710 	debugfs_remove(fnic->fnic_stats_debugfs_file);
711 	fnic->fnic_stats_debugfs_file = NULL;
712 
713 	debugfs_remove(fnic->fnic_reset_debugfs_file);
714 	fnic->fnic_reset_debugfs_file = NULL;
715 
716 	debugfs_remove(fnic->fnic_stats_debugfs_host);
717 	fnic->fnic_stats_debugfs_host = NULL;
718 }
719