Commit | Line | Data |
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4d7007b4 HP |
1 | /* |
2 | * Copyright 2012 Cisco Systems, Inc. All rights reserved. | |
3 | * | |
4 | * This program is free software; you may redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; version 2 of the License. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
9 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
10 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
11 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
12 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
14 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
15 | * SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/debugfs.h> | |
d6472302 | 21 | #include <linux/vmalloc.h> |
4d7007b4 HP |
22 | #include "fnic.h" |
23 | ||
24 | static struct dentry *fnic_trace_debugfs_root; | |
25 | static struct dentry *fnic_trace_debugfs_file; | |
26 | static struct dentry *fnic_trace_enable; | |
67125b02 HP |
27 | static struct dentry *fnic_stats_debugfs_root; |
28 | ||
abb14148 HS |
29 | static struct dentry *fnic_fc_trace_debugfs_file; |
30 | static struct dentry *fnic_fc_rdata_trace_debugfs_file; | |
31 | static struct dentry *fnic_fc_trace_enable; | |
32 | static struct dentry *fnic_fc_trace_clear; | |
33 | ||
34 | struct fc_trace_flag_type { | |
35 | u8 fc_row_file; | |
36 | u8 fc_normal_file; | |
37 | u8 fnic_trace; | |
38 | u8 fc_trace; | |
39 | u8 fc_clear; | |
40 | }; | |
41 | ||
42 | static struct fc_trace_flag_type *fc_trc_flag; | |
43 | ||
67125b02 HP |
44 | /* |
45 | * fnic_debugfs_init - Initialize debugfs for fnic debug logging | |
46 | * | |
47 | * Description: | |
48 | * When Debugfs is configured this routine sets up the fnic debugfs | |
49 | * file system. If not already created, this routine will create the | |
50 | * fnic directory and statistics directory for trace buffer and | |
51 | * stats logging. | |
52 | */ | |
53 | int fnic_debugfs_init(void) | |
54 | { | |
55 | int rc = -1; | |
56 | fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL); | |
57 | if (!fnic_trace_debugfs_root) { | |
58 | printk(KERN_DEBUG "Cannot create debugfs root\n"); | |
59 | return rc; | |
60 | } | |
61 | ||
62 | if (!fnic_trace_debugfs_root) { | |
63 | printk(KERN_DEBUG | |
64 | "fnic root directory doesn't exist in debugfs\n"); | |
65 | return rc; | |
66 | } | |
67 | ||
68 | fnic_stats_debugfs_root = debugfs_create_dir("statistics", | |
69 | fnic_trace_debugfs_root); | |
70 | if (!fnic_stats_debugfs_root) { | |
71 | printk(KERN_DEBUG "Cannot create Statistics directory\n"); | |
72 | return rc; | |
73 | } | |
74 | ||
abb14148 HS |
75 | /* Allocate memory to structure */ |
76 | fc_trc_flag = (struct fc_trace_flag_type *) | |
77 | vmalloc(sizeof(struct fc_trace_flag_type)); | |
78 | ||
79 | if (fc_trc_flag) { | |
80 | fc_trc_flag->fc_row_file = 0; | |
81 | fc_trc_flag->fc_normal_file = 1; | |
82 | fc_trc_flag->fnic_trace = 2; | |
83 | fc_trc_flag->fc_trace = 3; | |
84 | fc_trc_flag->fc_clear = 4; | |
85 | } | |
86 | ||
67125b02 HP |
87 | rc = 0; |
88 | return rc; | |
89 | } | |
90 | ||
91 | /* | |
92 | * fnic_debugfs_terminate - Tear down debugfs infrastructure | |
93 | * | |
94 | * Description: | |
95 | * When Debugfs is configured this routine removes debugfs file system | |
96 | * elements that are specific to fnic. | |
97 | */ | |
98 | void fnic_debugfs_terminate(void) | |
99 | { | |
100 | debugfs_remove(fnic_stats_debugfs_root); | |
101 | fnic_stats_debugfs_root = NULL; | |
102 | ||
103 | debugfs_remove(fnic_trace_debugfs_root); | |
104 | fnic_trace_debugfs_root = NULL; | |
abb14148 HS |
105 | |
106 | if (fc_trc_flag) | |
107 | vfree(fc_trc_flag); | |
67125b02 | 108 | } |
4d7007b4 | 109 | |
4d7007b4 | 110 | /* |
abb14148 HS |
111 | * fnic_trace_ctrl_read - |
112 | * Read trace_enable ,fc_trace_enable | |
113 | * or fc_trace_clear debugfs file | |
4d7007b4 HP |
114 | * @filp: The file pointer to read from. |
115 | * @ubuf: The buffer to copy the data to. | |
116 | * @cnt: The number of bytes to read. | |
117 | * @ppos: The position in the file to start reading from. | |
118 | * | |
119 | * Description: | |
abb14148 HS |
120 | * This routine reads value of variable fnic_tracing_enabled or |
121 | * fnic_fc_tracing_enabled or fnic_fc_trace_cleared | |
122 | * and stores into local @buf. | |
123 | * It will start reading file at @ppos and | |
4d7007b4 HP |
124 | * copy up to @cnt of data to @ubuf from @buf. |
125 | * | |
126 | * Returns: | |
127 | * This function returns the amount of data that was read. | |
128 | */ | |
129 | static ssize_t fnic_trace_ctrl_read(struct file *filp, | |
130 | char __user *ubuf, | |
131 | size_t cnt, loff_t *ppos) | |
132 | { | |
133 | char buf[64]; | |
134 | int len; | |
abb14148 HS |
135 | u8 *trace_type; |
136 | len = 0; | |
137 | trace_type = (u8 *)filp->private_data; | |
138 | if (*trace_type == fc_trc_flag->fnic_trace) | |
139 | len = sprintf(buf, "%u\n", fnic_tracing_enabled); | |
140 | else if (*trace_type == fc_trc_flag->fc_trace) | |
141 | len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled); | |
142 | else if (*trace_type == fc_trc_flag->fc_clear) | |
143 | len = sprintf(buf, "%u\n", fnic_fc_trace_cleared); | |
144 | else | |
145 | pr_err("fnic: Cannot read to any debugfs file\n"); | |
4d7007b4 HP |
146 | |
147 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
148 | } | |
149 | ||
150 | /* | |
abb14148 HS |
151 | * fnic_trace_ctrl_write - |
152 | * Write to trace_enable, fc_trace_enable or | |
153 | * fc_trace_clear debugfs file | |
4d7007b4 HP |
154 | * @filp: The file pointer to write from. |
155 | * @ubuf: The buffer to copy the data from. | |
156 | * @cnt: The number of bytes to write. | |
157 | * @ppos: The position in the file to start writing to. | |
158 | * | |
159 | * Description: | |
160 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
abb14148 HS |
161 | * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared |
162 | * value as per user input. | |
4d7007b4 HP |
163 | * |
164 | * Returns: | |
165 | * This function returns the amount of data that was written. | |
166 | */ | |
167 | static ssize_t fnic_trace_ctrl_write(struct file *filp, | |
168 | const char __user *ubuf, | |
169 | size_t cnt, loff_t *ppos) | |
170 | { | |
171 | char buf[64]; | |
172 | unsigned long val; | |
173 | int ret; | |
abb14148 HS |
174 | u8 *trace_type; |
175 | trace_type = (u8 *)filp->private_data; | |
4d7007b4 HP |
176 | |
177 | if (cnt >= sizeof(buf)) | |
178 | return -EINVAL; | |
179 | ||
180 | if (copy_from_user(&buf, ubuf, cnt)) | |
181 | return -EFAULT; | |
182 | ||
183 | buf[cnt] = 0; | |
184 | ||
185 | ret = kstrtoul(buf, 10, &val); | |
186 | if (ret < 0) | |
187 | return ret; | |
188 | ||
abb14148 HS |
189 | if (*trace_type == fc_trc_flag->fnic_trace) |
190 | fnic_tracing_enabled = val; | |
191 | else if (*trace_type == fc_trc_flag->fc_trace) | |
192 | fnic_fc_tracing_enabled = val; | |
193 | else if (*trace_type == fc_trc_flag->fc_clear) | |
194 | fnic_fc_trace_cleared = val; | |
195 | else | |
1a84db56 | 196 | pr_err("fnic: cannot write to any debugfs file\n"); |
abb14148 | 197 | |
4d7007b4 HP |
198 | (*ppos)++; |
199 | ||
200 | return cnt; | |
201 | } | |
202 | ||
abb14148 HS |
203 | static const struct file_operations fnic_trace_ctrl_fops = { |
204 | .owner = THIS_MODULE, | |
d9462140 | 205 | .open = simple_open, |
abb14148 HS |
206 | .read = fnic_trace_ctrl_read, |
207 | .write = fnic_trace_ctrl_write, | |
208 | }; | |
209 | ||
4d7007b4 HP |
210 | /* |
211 | * fnic_trace_debugfs_open - Open the fnic trace log | |
212 | * @inode: The inode pointer | |
213 | * @file: The file pointer to attach the log output | |
214 | * | |
215 | * Description: | |
216 | * This routine is the entry point for the debugfs open file operation. | |
217 | * It allocates the necessary buffer for the log, fills the buffer from | |
218 | * the in-memory log and then returns a pointer to that log in | |
219 | * the private_data field in @file. | |
220 | * | |
221 | * Returns: | |
222 | * This function returns zero if successful. On error it will return | |
223 | * a negative error value. | |
224 | */ | |
225 | static int fnic_trace_debugfs_open(struct inode *inode, | |
226 | struct file *file) | |
227 | { | |
228 | fnic_dbgfs_t *fnic_dbg_prt; | |
abb14148 HS |
229 | u8 *rdata_ptr; |
230 | rdata_ptr = (u8 *)inode->i_private; | |
4d7007b4 HP |
231 | fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL); |
232 | if (!fnic_dbg_prt) | |
233 | return -ENOMEM; | |
234 | ||
abb14148 | 235 | if (*rdata_ptr == fc_trc_flag->fnic_trace) { |
42bc47b3 KC |
236 | fnic_dbg_prt->buffer = vmalloc(array3_size(3, trace_max_pages, |
237 | PAGE_SIZE)); | |
abb14148 HS |
238 | if (!fnic_dbg_prt->buffer) { |
239 | kfree(fnic_dbg_prt); | |
240 | return -ENOMEM; | |
241 | } | |
242 | memset((void *)fnic_dbg_prt->buffer, 0, | |
243 | 3 * (trace_max_pages * PAGE_SIZE)); | |
244 | fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt); | |
245 | } else { | |
246 | fnic_dbg_prt->buffer = | |
42bc47b3 KC |
247 | vmalloc(array3_size(3, fnic_fc_trace_max_pages, |
248 | PAGE_SIZE)); | |
abb14148 HS |
249 | if (!fnic_dbg_prt->buffer) { |
250 | kfree(fnic_dbg_prt); | |
251 | return -ENOMEM; | |
252 | } | |
253 | memset((void *)fnic_dbg_prt->buffer, 0, | |
254 | 3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); | |
255 | fnic_dbg_prt->buffer_len = | |
256 | fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr); | |
4d7007b4 | 257 | } |
4d7007b4 | 258 | file->private_data = fnic_dbg_prt; |
abb14148 | 259 | |
4d7007b4 HP |
260 | return 0; |
261 | } | |
262 | ||
263 | /* | |
264 | * fnic_trace_debugfs_lseek - Seek through a debugfs file | |
265 | * @file: The file pointer to seek through. | |
266 | * @offset: The offset to seek to or the amount to seek by. | |
267 | * @howto: Indicates how to seek. | |
268 | * | |
269 | * Description: | |
270 | * This routine is the entry point for the debugfs lseek file operation. | |
271 | * The @howto parameter indicates whether @offset is the offset to directly | |
272 | * seek to, or if it is a value to seek forward or reverse by. This function | |
273 | * figures out what the new offset of the debugfs file will be and assigns | |
274 | * that value to the f_pos field of @file. | |
275 | * | |
276 | * Returns: | |
277 | * This function returns the new offset if successful and returns a negative | |
278 | * error if unable to process the seek. | |
279 | */ | |
280 | static loff_t fnic_trace_debugfs_lseek(struct file *file, | |
281 | loff_t offset, | |
282 | int howto) | |
283 | { | |
284 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
eb5881d3 AV |
285 | return fixed_size_llseek(file, offset, howto, |
286 | fnic_dbg_prt->buffer_len); | |
4d7007b4 HP |
287 | } |
288 | ||
289 | /* | |
290 | * fnic_trace_debugfs_read - Read a debugfs file | |
291 | * @file: The file pointer to read from. | |
292 | * @ubuf: The buffer to copy the data to. | |
293 | * @nbytes: The number of bytes to read. | |
294 | * @pos: The position in the file to start reading from. | |
295 | * | |
296 | * Description: | |
297 | * This routine reads data from the buffer indicated in the private_data | |
298 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
299 | * data to @ubuf. | |
300 | * | |
301 | * Returns: | |
302 | * This function returns the amount of data that was read (this could be | |
303 | * less than @nbytes if the end of the file was reached). | |
304 | */ | |
305 | static ssize_t fnic_trace_debugfs_read(struct file *file, | |
306 | char __user *ubuf, | |
307 | size_t nbytes, | |
308 | loff_t *pos) | |
309 | { | |
310 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
311 | int rc = 0; | |
312 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
313 | fnic_dbg_prt->buffer, | |
314 | fnic_dbg_prt->buffer_len); | |
315 | return rc; | |
316 | } | |
317 | ||
318 | /* | |
319 | * fnic_trace_debugfs_release - Release the buffer used to store | |
320 | * debugfs file data | |
321 | * @inode: The inode pointer | |
322 | * @file: The file pointer that contains the buffer to release | |
323 | * | |
324 | * Description: | |
325 | * This routine frees the buffer that was allocated when the debugfs | |
326 | * file was opened. | |
327 | * | |
328 | * Returns: | |
329 | * This function returns zero. | |
330 | */ | |
331 | static int fnic_trace_debugfs_release(struct inode *inode, | |
332 | struct file *file) | |
333 | { | |
334 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
335 | ||
336 | vfree(fnic_dbg_prt->buffer); | |
337 | kfree(fnic_dbg_prt); | |
338 | return 0; | |
339 | } | |
340 | ||
4d7007b4 HP |
341 | static const struct file_operations fnic_trace_debugfs_fops = { |
342 | .owner = THIS_MODULE, | |
343 | .open = fnic_trace_debugfs_open, | |
344 | .llseek = fnic_trace_debugfs_lseek, | |
345 | .read = fnic_trace_debugfs_read, | |
346 | .release = fnic_trace_debugfs_release, | |
347 | }; | |
348 | ||
349 | /* | |
350 | * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging | |
351 | * | |
352 | * Description: | |
353 | * When Debugfs is configured this routine sets up the fnic debugfs | |
354 | * file system. If not already created, this routine will create the | |
67125b02 HP |
355 | * create file trace to log fnic trace buffer output into debugfs and |
356 | * it will also create file trace_enable to control enable/disable of | |
357 | * trace logging into trace buffer. | |
4d7007b4 HP |
358 | */ |
359 | int fnic_trace_debugfs_init(void) | |
360 | { | |
361 | int rc = -1; | |
4d7007b4 | 362 | if (!fnic_trace_debugfs_root) { |
67125b02 HP |
363 | printk(KERN_DEBUG |
364 | "FNIC Debugfs root directory doesn't exist\n"); | |
4d7007b4 HP |
365 | return rc; |
366 | } | |
367 | fnic_trace_enable = debugfs_create_file("tracing_enable", | |
abb14148 HS |
368 | S_IFREG|S_IRUGO|S_IWUSR, |
369 | fnic_trace_debugfs_root, | |
370 | &(fc_trc_flag->fnic_trace), | |
371 | &fnic_trace_ctrl_fops); | |
4d7007b4 HP |
372 | |
373 | if (!fnic_trace_enable) { | |
67125b02 HP |
374 | printk(KERN_DEBUG |
375 | "Cannot create trace_enable file under debugfs\n"); | |
4d7007b4 HP |
376 | return rc; |
377 | } | |
378 | ||
379 | fnic_trace_debugfs_file = debugfs_create_file("trace", | |
abb14148 HS |
380 | S_IFREG|S_IRUGO|S_IWUSR, |
381 | fnic_trace_debugfs_root, | |
382 | &(fc_trc_flag->fnic_trace), | |
383 | &fnic_trace_debugfs_fops); | |
4d7007b4 HP |
384 | |
385 | if (!fnic_trace_debugfs_file) { | |
67125b02 HP |
386 | printk(KERN_DEBUG |
387 | "Cannot create trace file under debugfs\n"); | |
4d7007b4 HP |
388 | return rc; |
389 | } | |
390 | rc = 0; | |
391 | return rc; | |
392 | } | |
393 | ||
394 | /* | |
395 | * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure | |
396 | * | |
397 | * Description: | |
398 | * When Debugfs is configured this routine removes debugfs file system | |
399 | * elements that are specific to fnic trace logging. | |
400 | */ | |
401 | void fnic_trace_debugfs_terminate(void) | |
402 | { | |
abb14148 HS |
403 | debugfs_remove(fnic_trace_debugfs_file); |
404 | fnic_trace_debugfs_file = NULL; | |
405 | ||
406 | debugfs_remove(fnic_trace_enable); | |
407 | fnic_trace_enable = NULL; | |
408 | } | |
409 | ||
410 | /* | |
411 | * fnic_fc_trace_debugfs_init - | |
412 | * Initialize debugfs for fnic control frame trace logging | |
413 | * | |
414 | * Description: | |
415 | * When Debugfs is configured this routine sets up the fnic_fc debugfs | |
416 | * file system. If not already created, this routine will create the | |
417 | * create file trace to log fnic fc trace buffer output into debugfs and | |
418 | * it will also create file fc_trace_enable to control enable/disable of | |
419 | * trace logging into trace buffer. | |
420 | */ | |
421 | ||
422 | int fnic_fc_trace_debugfs_init(void) | |
423 | { | |
424 | int rc = -1; | |
425 | ||
426 | if (!fnic_trace_debugfs_root) { | |
427 | pr_err("fnic:Debugfs root directory doesn't exist\n"); | |
428 | return rc; | |
429 | } | |
430 | ||
431 | fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable", | |
432 | S_IFREG|S_IRUGO|S_IWUSR, | |
433 | fnic_trace_debugfs_root, | |
434 | &(fc_trc_flag->fc_trace), | |
435 | &fnic_trace_ctrl_fops); | |
436 | ||
437 | if (!fnic_fc_trace_enable) { | |
438 | pr_err("fnic: Failed create fc_trace_enable file\n"); | |
439 | return rc; | |
440 | } | |
441 | ||
442 | fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear", | |
443 | S_IFREG|S_IRUGO|S_IWUSR, | |
444 | fnic_trace_debugfs_root, | |
445 | &(fc_trc_flag->fc_clear), | |
446 | &fnic_trace_ctrl_fops); | |
447 | ||
448 | if (!fnic_fc_trace_clear) { | |
449 | pr_err("fnic: Failed to create fc_trace_enable file\n"); | |
450 | return rc; | |
451 | } | |
452 | ||
453 | fnic_fc_rdata_trace_debugfs_file = | |
454 | debugfs_create_file("fc_trace_rdata", | |
455 | S_IFREG|S_IRUGO|S_IWUSR, | |
456 | fnic_trace_debugfs_root, | |
457 | &(fc_trc_flag->fc_normal_file), | |
458 | &fnic_trace_debugfs_fops); | |
459 | ||
460 | if (!fnic_fc_rdata_trace_debugfs_file) { | |
461 | pr_err("fnic: Failed create fc_rdata_trace file\n"); | |
462 | return rc; | |
4d7007b4 | 463 | } |
abb14148 HS |
464 | |
465 | fnic_fc_trace_debugfs_file = | |
466 | debugfs_create_file("fc_trace", | |
467 | S_IFREG|S_IRUGO|S_IWUSR, | |
468 | fnic_trace_debugfs_root, | |
469 | &(fc_trc_flag->fc_row_file), | |
470 | &fnic_trace_debugfs_fops); | |
471 | ||
472 | if (!fnic_fc_trace_debugfs_file) { | |
473 | pr_err("fnic: Failed to create fc_trace file\n"); | |
474 | return rc; | |
4d7007b4 | 475 | } |
abb14148 HS |
476 | rc = 0; |
477 | return rc; | |
478 | } | |
479 | ||
480 | /* | |
481 | * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure | |
482 | * | |
483 | * Description: | |
484 | * When Debugfs is configured this routine removes debugfs file system | |
485 | * elements that are specific to fnic_fc trace logging. | |
486 | */ | |
487 | ||
488 | void fnic_fc_trace_debugfs_terminate(void) | |
489 | { | |
490 | debugfs_remove(fnic_fc_trace_debugfs_file); | |
491 | fnic_fc_trace_debugfs_file = NULL; | |
492 | ||
493 | debugfs_remove(fnic_fc_rdata_trace_debugfs_file); | |
494 | fnic_fc_rdata_trace_debugfs_file = NULL; | |
495 | ||
496 | debugfs_remove(fnic_fc_trace_enable); | |
497 | fnic_fc_trace_enable = NULL; | |
498 | ||
499 | debugfs_remove(fnic_fc_trace_clear); | |
500 | fnic_fc_trace_clear = NULL; | |
67125b02 HP |
501 | } |
502 | ||
503 | /* | |
504 | * fnic_reset_stats_open - Open the reset_stats file | |
505 | * @inode: The inode pointer. | |
506 | * @file: The file pointer to attach the stats reset flag. | |
507 | * | |
508 | * Description: | |
509 | * This routine opens a debugsfs file reset_stats and stores i_private data | |
510 | * to debug structure to retrieve later for while performing other | |
511 | * file oprations. | |
512 | * | |
513 | * Returns: | |
514 | * This function returns zero if successful. | |
515 | */ | |
516 | static int fnic_reset_stats_open(struct inode *inode, struct file *file) | |
517 | { | |
518 | struct stats_debug_info *debug; | |
519 | ||
520 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
521 | if (!debug) | |
522 | return -ENOMEM; | |
523 | ||
524 | debug->i_private = inode->i_private; | |
525 | ||
526 | file->private_data = debug; | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /* | |
532 | * fnic_reset_stats_read - Read a reset_stats debugfs file | |
533 | * @filp: The file pointer to read from. | |
534 | * @ubuf: The buffer to copy the data to. | |
535 | * @cnt: The number of bytes to read. | |
536 | * @ppos: The position in the file to start reading from. | |
537 | * | |
538 | * Description: | |
539 | * This routine reads value of variable reset_stats | |
540 | * and stores into local @buf. It will start reading file at @ppos and | |
541 | * copy up to @cnt of data to @ubuf from @buf. | |
542 | * | |
543 | * Returns: | |
544 | * This function returns the amount of data that was read. | |
545 | */ | |
546 | static ssize_t fnic_reset_stats_read(struct file *file, | |
547 | char __user *ubuf, | |
548 | size_t cnt, loff_t *ppos) | |
549 | { | |
550 | struct stats_debug_info *debug = file->private_data; | |
551 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
552 | char buf[64]; | |
553 | int len; | |
554 | ||
555 | len = sprintf(buf, "%u\n", fnic->reset_stats); | |
556 | ||
557 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
558 | } | |
559 | ||
560 | /* | |
561 | * fnic_reset_stats_write - Write to reset_stats debugfs file | |
562 | * @filp: The file pointer to write from. | |
563 | * @ubuf: The buffer to copy the data from. | |
564 | * @cnt: The number of bytes to write. | |
565 | * @ppos: The position in the file to start writing to. | |
566 | * | |
567 | * Description: | |
568 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
569 | * resets cumulative stats of fnic. | |
570 | * | |
571 | * Returns: | |
572 | * This function returns the amount of data that was written. | |
573 | */ | |
574 | static ssize_t fnic_reset_stats_write(struct file *file, | |
575 | const char __user *ubuf, | |
576 | size_t cnt, loff_t *ppos) | |
577 | { | |
578 | struct stats_debug_info *debug = file->private_data; | |
579 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
580 | struct fnic_stats *stats = &fnic->fnic_stats; | |
581 | u64 *io_stats_p = (u64 *)&stats->io_stats; | |
582 | u64 *fw_stats_p = (u64 *)&stats->fw_stats; | |
583 | char buf[64]; | |
584 | unsigned long val; | |
585 | int ret; | |
586 | ||
587 | if (cnt >= sizeof(buf)) | |
588 | return -EINVAL; | |
589 | ||
590 | if (copy_from_user(&buf, ubuf, cnt)) | |
591 | return -EFAULT; | |
592 | ||
593 | buf[cnt] = 0; | |
594 | ||
595 | ret = kstrtoul(buf, 10, &val); | |
596 | if (ret < 0) | |
597 | return ret; | |
598 | ||
599 | fnic->reset_stats = val; | |
600 | ||
601 | if (fnic->reset_stats) { | |
602 | /* Skip variable is used to avoid descrepancies to Num IOs | |
603 | * and IO Completions stats. Skip incrementing No IO Compls | |
604 | * for pending active IOs after reset stats | |
605 | */ | |
606 | atomic64_set(&fnic->io_cmpl_skip, | |
607 | atomic64_read(&stats->io_stats.active_ios)); | |
608 | memset(&stats->abts_stats, 0, sizeof(struct abort_stats)); | |
609 | memset(&stats->term_stats, 0, | |
610 | sizeof(struct terminate_stats)); | |
611 | memset(&stats->reset_stats, 0, sizeof(struct reset_stats)); | |
612 | memset(&stats->misc_stats, 0, sizeof(struct misc_stats)); | |
613 | memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats)); | |
614 | memset(io_stats_p+1, 0, | |
615 | sizeof(struct io_path_stats) - sizeof(u64)); | |
616 | memset(fw_stats_p+1, 0, | |
617 | sizeof(struct fw_stats) - sizeof(u64)); | |
22807aa8 | 618 | ktime_get_real_ts64(&stats->stats_timestamps.last_reset_time); |
4d7007b4 | 619 | } |
67125b02 HP |
620 | |
621 | (*ppos)++; | |
622 | return cnt; | |
623 | } | |
624 | ||
625 | /* | |
626 | * fnic_reset_stats_release - Release the buffer used to store | |
627 | * debugfs file data | |
628 | * @inode: The inode pointer | |
629 | * @file: The file pointer that contains the buffer to release | |
630 | * | |
631 | * Description: | |
632 | * This routine frees the buffer that was allocated when the debugfs | |
633 | * file was opened. | |
634 | * | |
635 | * Returns: | |
636 | * This function returns zero. | |
637 | */ | |
638 | static int fnic_reset_stats_release(struct inode *inode, | |
639 | struct file *file) | |
640 | { | |
641 | struct stats_debug_info *debug = file->private_data; | |
642 | kfree(debug); | |
643 | return 0; | |
644 | } | |
645 | ||
646 | /* | |
647 | * fnic_stats_debugfs_open - Open the stats file for specific host | |
648 | * and get fnic stats. | |
649 | * @inode: The inode pointer. | |
650 | * @file: The file pointer to attach the specific host statistics. | |
651 | * | |
652 | * Description: | |
653 | * This routine opens a debugsfs file stats of specific host and print | |
654 | * fnic stats. | |
655 | * | |
656 | * Returns: | |
657 | * This function returns zero if successful. | |
658 | */ | |
659 | static int fnic_stats_debugfs_open(struct inode *inode, | |
660 | struct file *file) | |
661 | { | |
662 | struct fnic *fnic = inode->i_private; | |
663 | struct fnic_stats *fnic_stats = &fnic->fnic_stats; | |
664 | struct stats_debug_info *debug; | |
665 | int buf_size = 2 * PAGE_SIZE; | |
666 | ||
667 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
668 | if (!debug) | |
669 | return -ENOMEM; | |
670 | ||
671 | debug->debug_buffer = vmalloc(buf_size); | |
672 | if (!debug->debug_buffer) { | |
673 | kfree(debug); | |
674 | return -ENOMEM; | |
675 | } | |
676 | ||
677 | debug->buf_size = buf_size; | |
678 | memset((void *)debug->debug_buffer, 0, buf_size); | |
679 | debug->buffer_len = fnic_get_stats_data(debug, fnic_stats); | |
680 | ||
681 | file->private_data = debug; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * fnic_stats_debugfs_read - Read a debugfs file | |
688 | * @file: The file pointer to read from. | |
689 | * @ubuf: The buffer to copy the data to. | |
690 | * @nbytes: The number of bytes to read. | |
691 | * @pos: The position in the file to start reading from. | |
692 | * | |
693 | * Description: | |
694 | * This routine reads data from the buffer indicated in the private_data | |
695 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
696 | * data to @ubuf. | |
697 | * | |
698 | * Returns: | |
699 | * This function returns the amount of data that was read (this could be | |
700 | * less than @nbytes if the end of the file was reached). | |
701 | */ | |
702 | static ssize_t fnic_stats_debugfs_read(struct file *file, | |
703 | char __user *ubuf, | |
704 | size_t nbytes, | |
705 | loff_t *pos) | |
706 | { | |
707 | struct stats_debug_info *debug = file->private_data; | |
708 | int rc = 0; | |
709 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
710 | debug->debug_buffer, | |
711 | debug->buffer_len); | |
712 | return rc; | |
713 | } | |
714 | ||
715 | /* | |
716 | * fnic_stats_stats_release - Release the buffer used to store | |
717 | * debugfs file data | |
718 | * @inode: The inode pointer | |
719 | * @file: The file pointer that contains the buffer to release | |
720 | * | |
721 | * Description: | |
722 | * This routine frees the buffer that was allocated when the debugfs | |
723 | * file was opened. | |
724 | * | |
725 | * Returns: | |
726 | * This function returns zero. | |
727 | */ | |
728 | static int fnic_stats_debugfs_release(struct inode *inode, | |
729 | struct file *file) | |
730 | { | |
731 | struct stats_debug_info *debug = file->private_data; | |
732 | vfree(debug->debug_buffer); | |
733 | kfree(debug); | |
734 | return 0; | |
735 | } | |
736 | ||
737 | static const struct file_operations fnic_stats_debugfs_fops = { | |
738 | .owner = THIS_MODULE, | |
739 | .open = fnic_stats_debugfs_open, | |
740 | .read = fnic_stats_debugfs_read, | |
741 | .release = fnic_stats_debugfs_release, | |
742 | }; | |
743 | ||
744 | static const struct file_operations fnic_reset_debugfs_fops = { | |
745 | .owner = THIS_MODULE, | |
746 | .open = fnic_reset_stats_open, | |
747 | .read = fnic_reset_stats_read, | |
748 | .write = fnic_reset_stats_write, | |
749 | .release = fnic_reset_stats_release, | |
750 | }; | |
751 | ||
752 | /* | |
753 | * fnic_stats_init - Initialize stats struct and create stats file per fnic | |
754 | * | |
755 | * Description: | |
756 | * When Debugfs is configured this routine sets up the stats file per fnic | |
757 | * It will create file stats and reset_stats under statistics/host# directory | |
758 | * to log per fnic stats. | |
759 | */ | |
760 | int fnic_stats_debugfs_init(struct fnic *fnic) | |
761 | { | |
762 | int rc = -1; | |
763 | char name[16]; | |
764 | ||
765 | snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no); | |
766 | ||
767 | if (!fnic_stats_debugfs_root) { | |
768 | printk(KERN_DEBUG "fnic_stats root doesn't exist\n"); | |
769 | return rc; | |
770 | } | |
771 | fnic->fnic_stats_debugfs_host = debugfs_create_dir(name, | |
772 | fnic_stats_debugfs_root); | |
773 | if (!fnic->fnic_stats_debugfs_host) { | |
774 | printk(KERN_DEBUG "Cannot create host directory\n"); | |
775 | return rc; | |
776 | } | |
777 | ||
778 | fnic->fnic_stats_debugfs_file = debugfs_create_file("stats", | |
779 | S_IFREG|S_IRUGO|S_IWUSR, | |
780 | fnic->fnic_stats_debugfs_host, | |
781 | fnic, | |
782 | &fnic_stats_debugfs_fops); | |
783 | if (!fnic->fnic_stats_debugfs_file) { | |
784 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
785 | return rc; | |
786 | } | |
787 | ||
788 | fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats", | |
789 | S_IFREG|S_IRUGO|S_IWUSR, | |
790 | fnic->fnic_stats_debugfs_host, | |
791 | fnic, | |
792 | &fnic_reset_debugfs_fops); | |
793 | if (!fnic->fnic_reset_debugfs_file) { | |
794 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
795 | return rc; | |
796 | } | |
797 | rc = 0; | |
798 | return rc; | |
799 | } | |
800 | ||
801 | /* | |
802 | * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats | |
803 | * | |
804 | * Description: | |
805 | * When Debugfs is configured this routine removes debugfs file system | |
806 | * elements that are specific to fnic stats. | |
807 | */ | |
808 | void fnic_stats_debugfs_remove(struct fnic *fnic) | |
809 | { | |
810 | if (!fnic) | |
811 | return; | |
812 | ||
813 | debugfs_remove(fnic->fnic_stats_debugfs_file); | |
814 | fnic->fnic_stats_debugfs_file = NULL; | |
815 | ||
816 | debugfs_remove(fnic->fnic_reset_debugfs_file); | |
817 | fnic->fnic_reset_debugfs_file = NULL; | |
818 | ||
819 | debugfs_remove(fnic->fnic_stats_debugfs_host); | |
820 | fnic->fnic_stats_debugfs_host = NULL; | |
4d7007b4 | 821 | } |