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 HP |
109 | |
110 | /* | |
abb14148 HS |
111 | * fnic_trace_ctrl_open - Open the trace_enable file for fnic_trace |
112 | * Or Open fc_trace_enable file for fc_trace | |
4d7007b4 HP |
113 | * @inode: The inode pointer. |
114 | * @file: The file pointer to attach the trace enable/disable flag. | |
115 | * | |
116 | * Description: | |
abb14148 | 117 | * This routine opens a debugsfs file trace_enable or fc_trace_enable. |
4d7007b4 HP |
118 | * |
119 | * Returns: | |
120 | * This function returns zero if successful. | |
121 | */ | |
122 | static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp) | |
123 | { | |
124 | filp->private_data = inode->i_private; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* | |
abb14148 HS |
129 | * fnic_trace_ctrl_read - |
130 | * Read trace_enable ,fc_trace_enable | |
131 | * or fc_trace_clear debugfs file | |
4d7007b4 HP |
132 | * @filp: The file pointer to read from. |
133 | * @ubuf: The buffer to copy the data to. | |
134 | * @cnt: The number of bytes to read. | |
135 | * @ppos: The position in the file to start reading from. | |
136 | * | |
137 | * Description: | |
abb14148 HS |
138 | * This routine reads value of variable fnic_tracing_enabled or |
139 | * fnic_fc_tracing_enabled or fnic_fc_trace_cleared | |
140 | * and stores into local @buf. | |
141 | * It will start reading file at @ppos and | |
4d7007b4 HP |
142 | * copy up to @cnt of data to @ubuf from @buf. |
143 | * | |
144 | * Returns: | |
145 | * This function returns the amount of data that was read. | |
146 | */ | |
147 | static ssize_t fnic_trace_ctrl_read(struct file *filp, | |
148 | char __user *ubuf, | |
149 | size_t cnt, loff_t *ppos) | |
150 | { | |
151 | char buf[64]; | |
152 | int len; | |
abb14148 HS |
153 | u8 *trace_type; |
154 | len = 0; | |
155 | trace_type = (u8 *)filp->private_data; | |
156 | if (*trace_type == fc_trc_flag->fnic_trace) | |
157 | len = sprintf(buf, "%u\n", fnic_tracing_enabled); | |
158 | else if (*trace_type == fc_trc_flag->fc_trace) | |
159 | len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled); | |
160 | else if (*trace_type == fc_trc_flag->fc_clear) | |
161 | len = sprintf(buf, "%u\n", fnic_fc_trace_cleared); | |
162 | else | |
163 | pr_err("fnic: Cannot read to any debugfs file\n"); | |
4d7007b4 HP |
164 | |
165 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
166 | } | |
167 | ||
168 | /* | |
abb14148 HS |
169 | * fnic_trace_ctrl_write - |
170 | * Write to trace_enable, fc_trace_enable or | |
171 | * fc_trace_clear debugfs file | |
4d7007b4 HP |
172 | * @filp: The file pointer to write from. |
173 | * @ubuf: The buffer to copy the data from. | |
174 | * @cnt: The number of bytes to write. | |
175 | * @ppos: The position in the file to start writing to. | |
176 | * | |
177 | * Description: | |
178 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
abb14148 HS |
179 | * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared |
180 | * value as per user input. | |
4d7007b4 HP |
181 | * |
182 | * Returns: | |
183 | * This function returns the amount of data that was written. | |
184 | */ | |
185 | static ssize_t fnic_trace_ctrl_write(struct file *filp, | |
186 | const char __user *ubuf, | |
187 | size_t cnt, loff_t *ppos) | |
188 | { | |
189 | char buf[64]; | |
190 | unsigned long val; | |
191 | int ret; | |
abb14148 HS |
192 | u8 *trace_type; |
193 | trace_type = (u8 *)filp->private_data; | |
4d7007b4 HP |
194 | |
195 | if (cnt >= sizeof(buf)) | |
196 | return -EINVAL; | |
197 | ||
198 | if (copy_from_user(&buf, ubuf, cnt)) | |
199 | return -EFAULT; | |
200 | ||
201 | buf[cnt] = 0; | |
202 | ||
203 | ret = kstrtoul(buf, 10, &val); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | ||
abb14148 HS |
207 | if (*trace_type == fc_trc_flag->fnic_trace) |
208 | fnic_tracing_enabled = val; | |
209 | else if (*trace_type == fc_trc_flag->fc_trace) | |
210 | fnic_fc_tracing_enabled = val; | |
211 | else if (*trace_type == fc_trc_flag->fc_clear) | |
212 | fnic_fc_trace_cleared = val; | |
213 | else | |
1a84db56 | 214 | pr_err("fnic: cannot write to any debugfs file\n"); |
abb14148 | 215 | |
4d7007b4 HP |
216 | (*ppos)++; |
217 | ||
218 | return cnt; | |
219 | } | |
220 | ||
abb14148 HS |
221 | static const struct file_operations fnic_trace_ctrl_fops = { |
222 | .owner = THIS_MODULE, | |
223 | .open = fnic_trace_ctrl_open, | |
224 | .read = fnic_trace_ctrl_read, | |
225 | .write = fnic_trace_ctrl_write, | |
226 | }; | |
227 | ||
4d7007b4 HP |
228 | /* |
229 | * fnic_trace_debugfs_open - Open the fnic trace log | |
230 | * @inode: The inode pointer | |
231 | * @file: The file pointer to attach the log output | |
232 | * | |
233 | * Description: | |
234 | * This routine is the entry point for the debugfs open file operation. | |
235 | * It allocates the necessary buffer for the log, fills the buffer from | |
236 | * the in-memory log and then returns a pointer to that log in | |
237 | * the private_data field in @file. | |
238 | * | |
239 | * Returns: | |
240 | * This function returns zero if successful. On error it will return | |
241 | * a negative error value. | |
242 | */ | |
243 | static int fnic_trace_debugfs_open(struct inode *inode, | |
244 | struct file *file) | |
245 | { | |
246 | fnic_dbgfs_t *fnic_dbg_prt; | |
abb14148 HS |
247 | u8 *rdata_ptr; |
248 | rdata_ptr = (u8 *)inode->i_private; | |
4d7007b4 HP |
249 | fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL); |
250 | if (!fnic_dbg_prt) | |
251 | return -ENOMEM; | |
252 | ||
abb14148 HS |
253 | if (*rdata_ptr == fc_trc_flag->fnic_trace) { |
254 | fnic_dbg_prt->buffer = vmalloc(3 * | |
255 | (trace_max_pages * PAGE_SIZE)); | |
256 | if (!fnic_dbg_prt->buffer) { | |
257 | kfree(fnic_dbg_prt); | |
258 | return -ENOMEM; | |
259 | } | |
260 | memset((void *)fnic_dbg_prt->buffer, 0, | |
261 | 3 * (trace_max_pages * PAGE_SIZE)); | |
262 | fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt); | |
263 | } else { | |
264 | fnic_dbg_prt->buffer = | |
265 | vmalloc(3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); | |
266 | if (!fnic_dbg_prt->buffer) { | |
267 | kfree(fnic_dbg_prt); | |
268 | return -ENOMEM; | |
269 | } | |
270 | memset((void *)fnic_dbg_prt->buffer, 0, | |
271 | 3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); | |
272 | fnic_dbg_prt->buffer_len = | |
273 | fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr); | |
4d7007b4 | 274 | } |
4d7007b4 | 275 | file->private_data = fnic_dbg_prt; |
abb14148 | 276 | |
4d7007b4 HP |
277 | return 0; |
278 | } | |
279 | ||
280 | /* | |
281 | * fnic_trace_debugfs_lseek - Seek through a debugfs file | |
282 | * @file: The file pointer to seek through. | |
283 | * @offset: The offset to seek to or the amount to seek by. | |
284 | * @howto: Indicates how to seek. | |
285 | * | |
286 | * Description: | |
287 | * This routine is the entry point for the debugfs lseek file operation. | |
288 | * The @howto parameter indicates whether @offset is the offset to directly | |
289 | * seek to, or if it is a value to seek forward or reverse by. This function | |
290 | * figures out what the new offset of the debugfs file will be and assigns | |
291 | * that value to the f_pos field of @file. | |
292 | * | |
293 | * Returns: | |
294 | * This function returns the new offset if successful and returns a negative | |
295 | * error if unable to process the seek. | |
296 | */ | |
297 | static loff_t fnic_trace_debugfs_lseek(struct file *file, | |
298 | loff_t offset, | |
299 | int howto) | |
300 | { | |
301 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
eb5881d3 AV |
302 | return fixed_size_llseek(file, offset, howto, |
303 | fnic_dbg_prt->buffer_len); | |
4d7007b4 HP |
304 | } |
305 | ||
306 | /* | |
307 | * fnic_trace_debugfs_read - Read a debugfs file | |
308 | * @file: The file pointer to read from. | |
309 | * @ubuf: The buffer to copy the data to. | |
310 | * @nbytes: The number of bytes to read. | |
311 | * @pos: The position in the file to start reading from. | |
312 | * | |
313 | * Description: | |
314 | * This routine reads data from the buffer indicated in the private_data | |
315 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
316 | * data to @ubuf. | |
317 | * | |
318 | * Returns: | |
319 | * This function returns the amount of data that was read (this could be | |
320 | * less than @nbytes if the end of the file was reached). | |
321 | */ | |
322 | static ssize_t fnic_trace_debugfs_read(struct file *file, | |
323 | char __user *ubuf, | |
324 | size_t nbytes, | |
325 | loff_t *pos) | |
326 | { | |
327 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
328 | int rc = 0; | |
329 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
330 | fnic_dbg_prt->buffer, | |
331 | fnic_dbg_prt->buffer_len); | |
332 | return rc; | |
333 | } | |
334 | ||
335 | /* | |
336 | * fnic_trace_debugfs_release - Release the buffer used to store | |
337 | * debugfs file data | |
338 | * @inode: The inode pointer | |
339 | * @file: The file pointer that contains the buffer to release | |
340 | * | |
341 | * Description: | |
342 | * This routine frees the buffer that was allocated when the debugfs | |
343 | * file was opened. | |
344 | * | |
345 | * Returns: | |
346 | * This function returns zero. | |
347 | */ | |
348 | static int fnic_trace_debugfs_release(struct inode *inode, | |
349 | struct file *file) | |
350 | { | |
351 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
352 | ||
353 | vfree(fnic_dbg_prt->buffer); | |
354 | kfree(fnic_dbg_prt); | |
355 | return 0; | |
356 | } | |
357 | ||
4d7007b4 HP |
358 | static const struct file_operations fnic_trace_debugfs_fops = { |
359 | .owner = THIS_MODULE, | |
360 | .open = fnic_trace_debugfs_open, | |
361 | .llseek = fnic_trace_debugfs_lseek, | |
362 | .read = fnic_trace_debugfs_read, | |
363 | .release = fnic_trace_debugfs_release, | |
364 | }; | |
365 | ||
366 | /* | |
367 | * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging | |
368 | * | |
369 | * Description: | |
370 | * When Debugfs is configured this routine sets up the fnic debugfs | |
371 | * file system. If not already created, this routine will create the | |
67125b02 HP |
372 | * create file trace to log fnic trace buffer output into debugfs and |
373 | * it will also create file trace_enable to control enable/disable of | |
374 | * trace logging into trace buffer. | |
4d7007b4 HP |
375 | */ |
376 | int fnic_trace_debugfs_init(void) | |
377 | { | |
378 | int rc = -1; | |
4d7007b4 | 379 | if (!fnic_trace_debugfs_root) { |
67125b02 HP |
380 | printk(KERN_DEBUG |
381 | "FNIC Debugfs root directory doesn't exist\n"); | |
4d7007b4 HP |
382 | return rc; |
383 | } | |
384 | fnic_trace_enable = debugfs_create_file("tracing_enable", | |
abb14148 HS |
385 | S_IFREG|S_IRUGO|S_IWUSR, |
386 | fnic_trace_debugfs_root, | |
387 | &(fc_trc_flag->fnic_trace), | |
388 | &fnic_trace_ctrl_fops); | |
4d7007b4 HP |
389 | |
390 | if (!fnic_trace_enable) { | |
67125b02 HP |
391 | printk(KERN_DEBUG |
392 | "Cannot create trace_enable file under debugfs\n"); | |
4d7007b4 HP |
393 | return rc; |
394 | } | |
395 | ||
396 | fnic_trace_debugfs_file = debugfs_create_file("trace", | |
abb14148 HS |
397 | S_IFREG|S_IRUGO|S_IWUSR, |
398 | fnic_trace_debugfs_root, | |
399 | &(fc_trc_flag->fnic_trace), | |
400 | &fnic_trace_debugfs_fops); | |
4d7007b4 HP |
401 | |
402 | if (!fnic_trace_debugfs_file) { | |
67125b02 HP |
403 | printk(KERN_DEBUG |
404 | "Cannot create trace file under debugfs\n"); | |
4d7007b4 HP |
405 | return rc; |
406 | } | |
407 | rc = 0; | |
408 | return rc; | |
409 | } | |
410 | ||
411 | /* | |
412 | * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure | |
413 | * | |
414 | * Description: | |
415 | * When Debugfs is configured this routine removes debugfs file system | |
416 | * elements that are specific to fnic trace logging. | |
417 | */ | |
418 | void fnic_trace_debugfs_terminate(void) | |
419 | { | |
abb14148 HS |
420 | debugfs_remove(fnic_trace_debugfs_file); |
421 | fnic_trace_debugfs_file = NULL; | |
422 | ||
423 | debugfs_remove(fnic_trace_enable); | |
424 | fnic_trace_enable = NULL; | |
425 | } | |
426 | ||
427 | /* | |
428 | * fnic_fc_trace_debugfs_init - | |
429 | * Initialize debugfs for fnic control frame trace logging | |
430 | * | |
431 | * Description: | |
432 | * When Debugfs is configured this routine sets up the fnic_fc debugfs | |
433 | * file system. If not already created, this routine will create the | |
434 | * create file trace to log fnic fc trace buffer output into debugfs and | |
435 | * it will also create file fc_trace_enable to control enable/disable of | |
436 | * trace logging into trace buffer. | |
437 | */ | |
438 | ||
439 | int fnic_fc_trace_debugfs_init(void) | |
440 | { | |
441 | int rc = -1; | |
442 | ||
443 | if (!fnic_trace_debugfs_root) { | |
444 | pr_err("fnic:Debugfs root directory doesn't exist\n"); | |
445 | return rc; | |
446 | } | |
447 | ||
448 | fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable", | |
449 | S_IFREG|S_IRUGO|S_IWUSR, | |
450 | fnic_trace_debugfs_root, | |
451 | &(fc_trc_flag->fc_trace), | |
452 | &fnic_trace_ctrl_fops); | |
453 | ||
454 | if (!fnic_fc_trace_enable) { | |
455 | pr_err("fnic: Failed create fc_trace_enable file\n"); | |
456 | return rc; | |
457 | } | |
458 | ||
459 | fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear", | |
460 | S_IFREG|S_IRUGO|S_IWUSR, | |
461 | fnic_trace_debugfs_root, | |
462 | &(fc_trc_flag->fc_clear), | |
463 | &fnic_trace_ctrl_fops); | |
464 | ||
465 | if (!fnic_fc_trace_clear) { | |
466 | pr_err("fnic: Failed to create fc_trace_enable file\n"); | |
467 | return rc; | |
468 | } | |
469 | ||
470 | fnic_fc_rdata_trace_debugfs_file = | |
471 | debugfs_create_file("fc_trace_rdata", | |
472 | S_IFREG|S_IRUGO|S_IWUSR, | |
473 | fnic_trace_debugfs_root, | |
474 | &(fc_trc_flag->fc_normal_file), | |
475 | &fnic_trace_debugfs_fops); | |
476 | ||
477 | if (!fnic_fc_rdata_trace_debugfs_file) { | |
478 | pr_err("fnic: Failed create fc_rdata_trace file\n"); | |
479 | return rc; | |
4d7007b4 | 480 | } |
abb14148 HS |
481 | |
482 | fnic_fc_trace_debugfs_file = | |
483 | debugfs_create_file("fc_trace", | |
484 | S_IFREG|S_IRUGO|S_IWUSR, | |
485 | fnic_trace_debugfs_root, | |
486 | &(fc_trc_flag->fc_row_file), | |
487 | &fnic_trace_debugfs_fops); | |
488 | ||
489 | if (!fnic_fc_trace_debugfs_file) { | |
490 | pr_err("fnic: Failed to create fc_trace file\n"); | |
491 | return rc; | |
4d7007b4 | 492 | } |
abb14148 HS |
493 | rc = 0; |
494 | return rc; | |
495 | } | |
496 | ||
497 | /* | |
498 | * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure | |
499 | * | |
500 | * Description: | |
501 | * When Debugfs is configured this routine removes debugfs file system | |
502 | * elements that are specific to fnic_fc trace logging. | |
503 | */ | |
504 | ||
505 | void fnic_fc_trace_debugfs_terminate(void) | |
506 | { | |
507 | debugfs_remove(fnic_fc_trace_debugfs_file); | |
508 | fnic_fc_trace_debugfs_file = NULL; | |
509 | ||
510 | debugfs_remove(fnic_fc_rdata_trace_debugfs_file); | |
511 | fnic_fc_rdata_trace_debugfs_file = NULL; | |
512 | ||
513 | debugfs_remove(fnic_fc_trace_enable); | |
514 | fnic_fc_trace_enable = NULL; | |
515 | ||
516 | debugfs_remove(fnic_fc_trace_clear); | |
517 | fnic_fc_trace_clear = NULL; | |
67125b02 HP |
518 | } |
519 | ||
520 | /* | |
521 | * fnic_reset_stats_open - Open the reset_stats file | |
522 | * @inode: The inode pointer. | |
523 | * @file: The file pointer to attach the stats reset flag. | |
524 | * | |
525 | * Description: | |
526 | * This routine opens a debugsfs file reset_stats and stores i_private data | |
527 | * to debug structure to retrieve later for while performing other | |
528 | * file oprations. | |
529 | * | |
530 | * Returns: | |
531 | * This function returns zero if successful. | |
532 | */ | |
533 | static int fnic_reset_stats_open(struct inode *inode, struct file *file) | |
534 | { | |
535 | struct stats_debug_info *debug; | |
536 | ||
537 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
538 | if (!debug) | |
539 | return -ENOMEM; | |
540 | ||
541 | debug->i_private = inode->i_private; | |
542 | ||
543 | file->private_data = debug; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | * fnic_reset_stats_read - Read a reset_stats debugfs file | |
550 | * @filp: The file pointer to read from. | |
551 | * @ubuf: The buffer to copy the data to. | |
552 | * @cnt: The number of bytes to read. | |
553 | * @ppos: The position in the file to start reading from. | |
554 | * | |
555 | * Description: | |
556 | * This routine reads value of variable reset_stats | |
557 | * and stores into local @buf. It will start reading file at @ppos and | |
558 | * copy up to @cnt of data to @ubuf from @buf. | |
559 | * | |
560 | * Returns: | |
561 | * This function returns the amount of data that was read. | |
562 | */ | |
563 | static ssize_t fnic_reset_stats_read(struct file *file, | |
564 | char __user *ubuf, | |
565 | size_t cnt, loff_t *ppos) | |
566 | { | |
567 | struct stats_debug_info *debug = file->private_data; | |
568 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
569 | char buf[64]; | |
570 | int len; | |
571 | ||
572 | len = sprintf(buf, "%u\n", fnic->reset_stats); | |
573 | ||
574 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
575 | } | |
576 | ||
577 | /* | |
578 | * fnic_reset_stats_write - Write to reset_stats debugfs file | |
579 | * @filp: The file pointer to write from. | |
580 | * @ubuf: The buffer to copy the data from. | |
581 | * @cnt: The number of bytes to write. | |
582 | * @ppos: The position in the file to start writing to. | |
583 | * | |
584 | * Description: | |
585 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
586 | * resets cumulative stats of fnic. | |
587 | * | |
588 | * Returns: | |
589 | * This function returns the amount of data that was written. | |
590 | */ | |
591 | static ssize_t fnic_reset_stats_write(struct file *file, | |
592 | const char __user *ubuf, | |
593 | size_t cnt, loff_t *ppos) | |
594 | { | |
595 | struct stats_debug_info *debug = file->private_data; | |
596 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
597 | struct fnic_stats *stats = &fnic->fnic_stats; | |
598 | u64 *io_stats_p = (u64 *)&stats->io_stats; | |
599 | u64 *fw_stats_p = (u64 *)&stats->fw_stats; | |
600 | char buf[64]; | |
601 | unsigned long val; | |
602 | int ret; | |
603 | ||
604 | if (cnt >= sizeof(buf)) | |
605 | return -EINVAL; | |
606 | ||
607 | if (copy_from_user(&buf, ubuf, cnt)) | |
608 | return -EFAULT; | |
609 | ||
610 | buf[cnt] = 0; | |
611 | ||
612 | ret = kstrtoul(buf, 10, &val); | |
613 | if (ret < 0) | |
614 | return ret; | |
615 | ||
616 | fnic->reset_stats = val; | |
617 | ||
618 | if (fnic->reset_stats) { | |
619 | /* Skip variable is used to avoid descrepancies to Num IOs | |
620 | * and IO Completions stats. Skip incrementing No IO Compls | |
621 | * for pending active IOs after reset stats | |
622 | */ | |
623 | atomic64_set(&fnic->io_cmpl_skip, | |
624 | atomic64_read(&stats->io_stats.active_ios)); | |
625 | memset(&stats->abts_stats, 0, sizeof(struct abort_stats)); | |
626 | memset(&stats->term_stats, 0, | |
627 | sizeof(struct terminate_stats)); | |
628 | memset(&stats->reset_stats, 0, sizeof(struct reset_stats)); | |
629 | memset(&stats->misc_stats, 0, sizeof(struct misc_stats)); | |
630 | memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats)); | |
631 | memset(io_stats_p+1, 0, | |
632 | sizeof(struct io_path_stats) - sizeof(u64)); | |
633 | memset(fw_stats_p+1, 0, | |
634 | sizeof(struct fw_stats) - sizeof(u64)); | |
4d7007b4 | 635 | } |
67125b02 HP |
636 | |
637 | (*ppos)++; | |
638 | return cnt; | |
639 | } | |
640 | ||
641 | /* | |
642 | * fnic_reset_stats_release - Release the buffer used to store | |
643 | * debugfs file data | |
644 | * @inode: The inode pointer | |
645 | * @file: The file pointer that contains the buffer to release | |
646 | * | |
647 | * Description: | |
648 | * This routine frees the buffer that was allocated when the debugfs | |
649 | * file was opened. | |
650 | * | |
651 | * Returns: | |
652 | * This function returns zero. | |
653 | */ | |
654 | static int fnic_reset_stats_release(struct inode *inode, | |
655 | struct file *file) | |
656 | { | |
657 | struct stats_debug_info *debug = file->private_data; | |
658 | kfree(debug); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* | |
663 | * fnic_stats_debugfs_open - Open the stats file for specific host | |
664 | * and get fnic stats. | |
665 | * @inode: The inode pointer. | |
666 | * @file: The file pointer to attach the specific host statistics. | |
667 | * | |
668 | * Description: | |
669 | * This routine opens a debugsfs file stats of specific host and print | |
670 | * fnic stats. | |
671 | * | |
672 | * Returns: | |
673 | * This function returns zero if successful. | |
674 | */ | |
675 | static int fnic_stats_debugfs_open(struct inode *inode, | |
676 | struct file *file) | |
677 | { | |
678 | struct fnic *fnic = inode->i_private; | |
679 | struct fnic_stats *fnic_stats = &fnic->fnic_stats; | |
680 | struct stats_debug_info *debug; | |
681 | int buf_size = 2 * PAGE_SIZE; | |
682 | ||
683 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
684 | if (!debug) | |
685 | return -ENOMEM; | |
686 | ||
687 | debug->debug_buffer = vmalloc(buf_size); | |
688 | if (!debug->debug_buffer) { | |
689 | kfree(debug); | |
690 | return -ENOMEM; | |
691 | } | |
692 | ||
693 | debug->buf_size = buf_size; | |
694 | memset((void *)debug->debug_buffer, 0, buf_size); | |
695 | debug->buffer_len = fnic_get_stats_data(debug, fnic_stats); | |
696 | ||
697 | file->private_data = debug; | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | /* | |
703 | * fnic_stats_debugfs_read - Read a debugfs file | |
704 | * @file: The file pointer to read from. | |
705 | * @ubuf: The buffer to copy the data to. | |
706 | * @nbytes: The number of bytes to read. | |
707 | * @pos: The position in the file to start reading from. | |
708 | * | |
709 | * Description: | |
710 | * This routine reads data from the buffer indicated in the private_data | |
711 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
712 | * data to @ubuf. | |
713 | * | |
714 | * Returns: | |
715 | * This function returns the amount of data that was read (this could be | |
716 | * less than @nbytes if the end of the file was reached). | |
717 | */ | |
718 | static ssize_t fnic_stats_debugfs_read(struct file *file, | |
719 | char __user *ubuf, | |
720 | size_t nbytes, | |
721 | loff_t *pos) | |
722 | { | |
723 | struct stats_debug_info *debug = file->private_data; | |
724 | int rc = 0; | |
725 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
726 | debug->debug_buffer, | |
727 | debug->buffer_len); | |
728 | return rc; | |
729 | } | |
730 | ||
731 | /* | |
732 | * fnic_stats_stats_release - Release the buffer used to store | |
733 | * debugfs file data | |
734 | * @inode: The inode pointer | |
735 | * @file: The file pointer that contains the buffer to release | |
736 | * | |
737 | * Description: | |
738 | * This routine frees the buffer that was allocated when the debugfs | |
739 | * file was opened. | |
740 | * | |
741 | * Returns: | |
742 | * This function returns zero. | |
743 | */ | |
744 | static int fnic_stats_debugfs_release(struct inode *inode, | |
745 | struct file *file) | |
746 | { | |
747 | struct stats_debug_info *debug = file->private_data; | |
748 | vfree(debug->debug_buffer); | |
749 | kfree(debug); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static const struct file_operations fnic_stats_debugfs_fops = { | |
754 | .owner = THIS_MODULE, | |
755 | .open = fnic_stats_debugfs_open, | |
756 | .read = fnic_stats_debugfs_read, | |
757 | .release = fnic_stats_debugfs_release, | |
758 | }; | |
759 | ||
760 | static const struct file_operations fnic_reset_debugfs_fops = { | |
761 | .owner = THIS_MODULE, | |
762 | .open = fnic_reset_stats_open, | |
763 | .read = fnic_reset_stats_read, | |
764 | .write = fnic_reset_stats_write, | |
765 | .release = fnic_reset_stats_release, | |
766 | }; | |
767 | ||
768 | /* | |
769 | * fnic_stats_init - Initialize stats struct and create stats file per fnic | |
770 | * | |
771 | * Description: | |
772 | * When Debugfs is configured this routine sets up the stats file per fnic | |
773 | * It will create file stats and reset_stats under statistics/host# directory | |
774 | * to log per fnic stats. | |
775 | */ | |
776 | int fnic_stats_debugfs_init(struct fnic *fnic) | |
777 | { | |
778 | int rc = -1; | |
779 | char name[16]; | |
780 | ||
781 | snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no); | |
782 | ||
783 | if (!fnic_stats_debugfs_root) { | |
784 | printk(KERN_DEBUG "fnic_stats root doesn't exist\n"); | |
785 | return rc; | |
786 | } | |
787 | fnic->fnic_stats_debugfs_host = debugfs_create_dir(name, | |
788 | fnic_stats_debugfs_root); | |
789 | if (!fnic->fnic_stats_debugfs_host) { | |
790 | printk(KERN_DEBUG "Cannot create host directory\n"); | |
791 | return rc; | |
792 | } | |
793 | ||
794 | fnic->fnic_stats_debugfs_file = debugfs_create_file("stats", | |
795 | S_IFREG|S_IRUGO|S_IWUSR, | |
796 | fnic->fnic_stats_debugfs_host, | |
797 | fnic, | |
798 | &fnic_stats_debugfs_fops); | |
799 | if (!fnic->fnic_stats_debugfs_file) { | |
800 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
801 | return rc; | |
802 | } | |
803 | ||
804 | fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats", | |
805 | S_IFREG|S_IRUGO|S_IWUSR, | |
806 | fnic->fnic_stats_debugfs_host, | |
807 | fnic, | |
808 | &fnic_reset_debugfs_fops); | |
809 | if (!fnic->fnic_reset_debugfs_file) { | |
810 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
811 | return rc; | |
812 | } | |
813 | rc = 0; | |
814 | return rc; | |
815 | } | |
816 | ||
817 | /* | |
818 | * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats | |
819 | * | |
820 | * Description: | |
821 | * When Debugfs is configured this routine removes debugfs file system | |
822 | * elements that are specific to fnic stats. | |
823 | */ | |
824 | void fnic_stats_debugfs_remove(struct fnic *fnic) | |
825 | { | |
826 | if (!fnic) | |
827 | return; | |
828 | ||
829 | debugfs_remove(fnic->fnic_stats_debugfs_file); | |
830 | fnic->fnic_stats_debugfs_file = NULL; | |
831 | ||
832 | debugfs_remove(fnic->fnic_reset_debugfs_file); | |
833 | fnic->fnic_reset_debugfs_file = NULL; | |
834 | ||
835 | debugfs_remove(fnic->fnic_stats_debugfs_host); | |
836 | fnic->fnic_stats_debugfs_host = NULL; | |
4d7007b4 | 837 | } |