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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> | |
21 | #include "fnic.h" | |
22 | ||
23 | static struct dentry *fnic_trace_debugfs_root; | |
24 | static struct dentry *fnic_trace_debugfs_file; | |
25 | static struct dentry *fnic_trace_enable; | |
67125b02 HP |
26 | static struct dentry *fnic_stats_debugfs_root; |
27 | ||
abb14148 HS |
28 | static struct dentry *fnic_fc_trace_debugfs_file; |
29 | static struct dentry *fnic_fc_rdata_trace_debugfs_file; | |
30 | static struct dentry *fnic_fc_trace_enable; | |
31 | static struct dentry *fnic_fc_trace_clear; | |
32 | ||
33 | struct fc_trace_flag_type { | |
34 | u8 fc_row_file; | |
35 | u8 fc_normal_file; | |
36 | u8 fnic_trace; | |
37 | u8 fc_trace; | |
38 | u8 fc_clear; | |
39 | }; | |
40 | ||
41 | static struct fc_trace_flag_type *fc_trc_flag; | |
42 | ||
67125b02 HP |
43 | /* |
44 | * fnic_debugfs_init - Initialize debugfs for fnic debug logging | |
45 | * | |
46 | * Description: | |
47 | * When Debugfs is configured this routine sets up the fnic debugfs | |
48 | * file system. If not already created, this routine will create the | |
49 | * fnic directory and statistics directory for trace buffer and | |
50 | * stats logging. | |
51 | */ | |
52 | int fnic_debugfs_init(void) | |
53 | { | |
54 | int rc = -1; | |
55 | fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL); | |
56 | if (!fnic_trace_debugfs_root) { | |
57 | printk(KERN_DEBUG "Cannot create debugfs root\n"); | |
58 | return rc; | |
59 | } | |
60 | ||
61 | if (!fnic_trace_debugfs_root) { | |
62 | printk(KERN_DEBUG | |
63 | "fnic root directory doesn't exist in debugfs\n"); | |
64 | return rc; | |
65 | } | |
66 | ||
67 | fnic_stats_debugfs_root = debugfs_create_dir("statistics", | |
68 | fnic_trace_debugfs_root); | |
69 | if (!fnic_stats_debugfs_root) { | |
70 | printk(KERN_DEBUG "Cannot create Statistics directory\n"); | |
71 | return rc; | |
72 | } | |
73 | ||
abb14148 HS |
74 | /* Allocate memory to structure */ |
75 | fc_trc_flag = (struct fc_trace_flag_type *) | |
76 | vmalloc(sizeof(struct fc_trace_flag_type)); | |
77 | ||
78 | if (fc_trc_flag) { | |
79 | fc_trc_flag->fc_row_file = 0; | |
80 | fc_trc_flag->fc_normal_file = 1; | |
81 | fc_trc_flag->fnic_trace = 2; | |
82 | fc_trc_flag->fc_trace = 3; | |
83 | fc_trc_flag->fc_clear = 4; | |
84 | } | |
85 | ||
67125b02 HP |
86 | rc = 0; |
87 | return rc; | |
88 | } | |
89 | ||
90 | /* | |
91 | * fnic_debugfs_terminate - Tear down debugfs infrastructure | |
92 | * | |
93 | * Description: | |
94 | * When Debugfs is configured this routine removes debugfs file system | |
95 | * elements that are specific to fnic. | |
96 | */ | |
97 | void fnic_debugfs_terminate(void) | |
98 | { | |
99 | debugfs_remove(fnic_stats_debugfs_root); | |
100 | fnic_stats_debugfs_root = NULL; | |
101 | ||
102 | debugfs_remove(fnic_trace_debugfs_root); | |
103 | fnic_trace_debugfs_root = NULL; | |
abb14148 HS |
104 | |
105 | if (fc_trc_flag) | |
106 | vfree(fc_trc_flag); | |
67125b02 | 107 | } |
4d7007b4 HP |
108 | |
109 | /* | |
abb14148 HS |
110 | * fnic_trace_ctrl_open - Open the trace_enable file for fnic_trace |
111 | * Or Open fc_trace_enable file for fc_trace | |
4d7007b4 HP |
112 | * @inode: The inode pointer. |
113 | * @file: The file pointer to attach the trace enable/disable flag. | |
114 | * | |
115 | * Description: | |
abb14148 | 116 | * This routine opens a debugsfs file trace_enable or fc_trace_enable. |
4d7007b4 HP |
117 | * |
118 | * Returns: | |
119 | * This function returns zero if successful. | |
120 | */ | |
121 | static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp) | |
122 | { | |
123 | filp->private_data = inode->i_private; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* | |
abb14148 HS |
128 | * fnic_trace_ctrl_read - |
129 | * Read trace_enable ,fc_trace_enable | |
130 | * or fc_trace_clear debugfs file | |
4d7007b4 HP |
131 | * @filp: The file pointer to read from. |
132 | * @ubuf: The buffer to copy the data to. | |
133 | * @cnt: The number of bytes to read. | |
134 | * @ppos: The position in the file to start reading from. | |
135 | * | |
136 | * Description: | |
abb14148 HS |
137 | * This routine reads value of variable fnic_tracing_enabled or |
138 | * fnic_fc_tracing_enabled or fnic_fc_trace_cleared | |
139 | * and stores into local @buf. | |
140 | * It will start reading file at @ppos and | |
4d7007b4 HP |
141 | * copy up to @cnt of data to @ubuf from @buf. |
142 | * | |
143 | * Returns: | |
144 | * This function returns the amount of data that was read. | |
145 | */ | |
146 | static ssize_t fnic_trace_ctrl_read(struct file *filp, | |
147 | char __user *ubuf, | |
148 | size_t cnt, loff_t *ppos) | |
149 | { | |
150 | char buf[64]; | |
151 | int len; | |
abb14148 HS |
152 | u8 *trace_type; |
153 | len = 0; | |
154 | trace_type = (u8 *)filp->private_data; | |
155 | if (*trace_type == fc_trc_flag->fnic_trace) | |
156 | len = sprintf(buf, "%u\n", fnic_tracing_enabled); | |
157 | else if (*trace_type == fc_trc_flag->fc_trace) | |
158 | len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled); | |
159 | else if (*trace_type == fc_trc_flag->fc_clear) | |
160 | len = sprintf(buf, "%u\n", fnic_fc_trace_cleared); | |
161 | else | |
162 | pr_err("fnic: Cannot read to any debugfs file\n"); | |
4d7007b4 HP |
163 | |
164 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
165 | } | |
166 | ||
167 | /* | |
abb14148 HS |
168 | * fnic_trace_ctrl_write - |
169 | * Write to trace_enable, fc_trace_enable or | |
170 | * fc_trace_clear debugfs file | |
4d7007b4 HP |
171 | * @filp: The file pointer to write from. |
172 | * @ubuf: The buffer to copy the data from. | |
173 | * @cnt: The number of bytes to write. | |
174 | * @ppos: The position in the file to start writing to. | |
175 | * | |
176 | * Description: | |
177 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
abb14148 HS |
178 | * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared |
179 | * value as per user input. | |
4d7007b4 HP |
180 | * |
181 | * Returns: | |
182 | * This function returns the amount of data that was written. | |
183 | */ | |
184 | static ssize_t fnic_trace_ctrl_write(struct file *filp, | |
185 | const char __user *ubuf, | |
186 | size_t cnt, loff_t *ppos) | |
187 | { | |
188 | char buf[64]; | |
189 | unsigned long val; | |
190 | int ret; | |
abb14148 HS |
191 | u8 *trace_type; |
192 | trace_type = (u8 *)filp->private_data; | |
4d7007b4 HP |
193 | |
194 | if (cnt >= sizeof(buf)) | |
195 | return -EINVAL; | |
196 | ||
197 | if (copy_from_user(&buf, ubuf, cnt)) | |
198 | return -EFAULT; | |
199 | ||
200 | buf[cnt] = 0; | |
201 | ||
202 | ret = kstrtoul(buf, 10, &val); | |
203 | if (ret < 0) | |
204 | return ret; | |
205 | ||
abb14148 HS |
206 | if (*trace_type == fc_trc_flag->fnic_trace) |
207 | fnic_tracing_enabled = val; | |
208 | else if (*trace_type == fc_trc_flag->fc_trace) | |
209 | fnic_fc_tracing_enabled = val; | |
210 | else if (*trace_type == fc_trc_flag->fc_clear) | |
211 | fnic_fc_trace_cleared = val; | |
212 | else | |
1a84db56 | 213 | pr_err("fnic: cannot write to any debugfs file\n"); |
abb14148 | 214 | |
4d7007b4 HP |
215 | (*ppos)++; |
216 | ||
217 | return cnt; | |
218 | } | |
219 | ||
abb14148 HS |
220 | static const struct file_operations fnic_trace_ctrl_fops = { |
221 | .owner = THIS_MODULE, | |
222 | .open = fnic_trace_ctrl_open, | |
223 | .read = fnic_trace_ctrl_read, | |
224 | .write = fnic_trace_ctrl_write, | |
225 | }; | |
226 | ||
4d7007b4 HP |
227 | /* |
228 | * fnic_trace_debugfs_open - Open the fnic trace log | |
229 | * @inode: The inode pointer | |
230 | * @file: The file pointer to attach the log output | |
231 | * | |
232 | * Description: | |
233 | * This routine is the entry point for the debugfs open file operation. | |
234 | * It allocates the necessary buffer for the log, fills the buffer from | |
235 | * the in-memory log and then returns a pointer to that log in | |
236 | * the private_data field in @file. | |
237 | * | |
238 | * Returns: | |
239 | * This function returns zero if successful. On error it will return | |
240 | * a negative error value. | |
241 | */ | |
242 | static int fnic_trace_debugfs_open(struct inode *inode, | |
243 | struct file *file) | |
244 | { | |
245 | fnic_dbgfs_t *fnic_dbg_prt; | |
abb14148 HS |
246 | u8 *rdata_ptr; |
247 | rdata_ptr = (u8 *)inode->i_private; | |
4d7007b4 HP |
248 | fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL); |
249 | if (!fnic_dbg_prt) | |
250 | return -ENOMEM; | |
251 | ||
abb14148 HS |
252 | if (*rdata_ptr == fc_trc_flag->fnic_trace) { |
253 | fnic_dbg_prt->buffer = vmalloc(3 * | |
254 | (trace_max_pages * PAGE_SIZE)); | |
255 | if (!fnic_dbg_prt->buffer) { | |
256 | kfree(fnic_dbg_prt); | |
257 | return -ENOMEM; | |
258 | } | |
259 | memset((void *)fnic_dbg_prt->buffer, 0, | |
260 | 3 * (trace_max_pages * PAGE_SIZE)); | |
261 | fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt); | |
262 | } else { | |
263 | fnic_dbg_prt->buffer = | |
264 | vmalloc(3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); | |
265 | if (!fnic_dbg_prt->buffer) { | |
266 | kfree(fnic_dbg_prt); | |
267 | return -ENOMEM; | |
268 | } | |
269 | memset((void *)fnic_dbg_prt->buffer, 0, | |
270 | 3 * (fnic_fc_trace_max_pages * PAGE_SIZE)); | |
271 | fnic_dbg_prt->buffer_len = | |
272 | fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr); | |
4d7007b4 | 273 | } |
4d7007b4 | 274 | file->private_data = fnic_dbg_prt; |
abb14148 | 275 | |
4d7007b4 HP |
276 | return 0; |
277 | } | |
278 | ||
279 | /* | |
280 | * fnic_trace_debugfs_lseek - Seek through a debugfs file | |
281 | * @file: The file pointer to seek through. | |
282 | * @offset: The offset to seek to or the amount to seek by. | |
283 | * @howto: Indicates how to seek. | |
284 | * | |
285 | * Description: | |
286 | * This routine is the entry point for the debugfs lseek file operation. | |
287 | * The @howto parameter indicates whether @offset is the offset to directly | |
288 | * seek to, or if it is a value to seek forward or reverse by. This function | |
289 | * figures out what the new offset of the debugfs file will be and assigns | |
290 | * that value to the f_pos field of @file. | |
291 | * | |
292 | * Returns: | |
293 | * This function returns the new offset if successful and returns a negative | |
294 | * error if unable to process the seek. | |
295 | */ | |
296 | static loff_t fnic_trace_debugfs_lseek(struct file *file, | |
297 | loff_t offset, | |
298 | int howto) | |
299 | { | |
300 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
eb5881d3 AV |
301 | return fixed_size_llseek(file, offset, howto, |
302 | fnic_dbg_prt->buffer_len); | |
4d7007b4 HP |
303 | } |
304 | ||
305 | /* | |
306 | * fnic_trace_debugfs_read - Read a debugfs file | |
307 | * @file: The file pointer to read from. | |
308 | * @ubuf: The buffer to copy the data to. | |
309 | * @nbytes: The number of bytes to read. | |
310 | * @pos: The position in the file to start reading from. | |
311 | * | |
312 | * Description: | |
313 | * This routine reads data from the buffer indicated in the private_data | |
314 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
315 | * data to @ubuf. | |
316 | * | |
317 | * Returns: | |
318 | * This function returns the amount of data that was read (this could be | |
319 | * less than @nbytes if the end of the file was reached). | |
320 | */ | |
321 | static ssize_t fnic_trace_debugfs_read(struct file *file, | |
322 | char __user *ubuf, | |
323 | size_t nbytes, | |
324 | loff_t *pos) | |
325 | { | |
326 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
327 | int rc = 0; | |
328 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
329 | fnic_dbg_prt->buffer, | |
330 | fnic_dbg_prt->buffer_len); | |
331 | return rc; | |
332 | } | |
333 | ||
334 | /* | |
335 | * fnic_trace_debugfs_release - Release the buffer used to store | |
336 | * debugfs file data | |
337 | * @inode: The inode pointer | |
338 | * @file: The file pointer that contains the buffer to release | |
339 | * | |
340 | * Description: | |
341 | * This routine frees the buffer that was allocated when the debugfs | |
342 | * file was opened. | |
343 | * | |
344 | * Returns: | |
345 | * This function returns zero. | |
346 | */ | |
347 | static int fnic_trace_debugfs_release(struct inode *inode, | |
348 | struct file *file) | |
349 | { | |
350 | fnic_dbgfs_t *fnic_dbg_prt = file->private_data; | |
351 | ||
352 | vfree(fnic_dbg_prt->buffer); | |
353 | kfree(fnic_dbg_prt); | |
354 | return 0; | |
355 | } | |
356 | ||
4d7007b4 HP |
357 | static const struct file_operations fnic_trace_debugfs_fops = { |
358 | .owner = THIS_MODULE, | |
359 | .open = fnic_trace_debugfs_open, | |
360 | .llseek = fnic_trace_debugfs_lseek, | |
361 | .read = fnic_trace_debugfs_read, | |
362 | .release = fnic_trace_debugfs_release, | |
363 | }; | |
364 | ||
365 | /* | |
366 | * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging | |
367 | * | |
368 | * Description: | |
369 | * When Debugfs is configured this routine sets up the fnic debugfs | |
370 | * file system. If not already created, this routine will create the | |
67125b02 HP |
371 | * create file trace to log fnic trace buffer output into debugfs and |
372 | * it will also create file trace_enable to control enable/disable of | |
373 | * trace logging into trace buffer. | |
4d7007b4 HP |
374 | */ |
375 | int fnic_trace_debugfs_init(void) | |
376 | { | |
377 | int rc = -1; | |
4d7007b4 | 378 | if (!fnic_trace_debugfs_root) { |
67125b02 HP |
379 | printk(KERN_DEBUG |
380 | "FNIC Debugfs root directory doesn't exist\n"); | |
4d7007b4 HP |
381 | return rc; |
382 | } | |
383 | fnic_trace_enable = debugfs_create_file("tracing_enable", | |
abb14148 HS |
384 | S_IFREG|S_IRUGO|S_IWUSR, |
385 | fnic_trace_debugfs_root, | |
386 | &(fc_trc_flag->fnic_trace), | |
387 | &fnic_trace_ctrl_fops); | |
4d7007b4 HP |
388 | |
389 | if (!fnic_trace_enable) { | |
67125b02 HP |
390 | printk(KERN_DEBUG |
391 | "Cannot create trace_enable file under debugfs\n"); | |
4d7007b4 HP |
392 | return rc; |
393 | } | |
394 | ||
395 | fnic_trace_debugfs_file = debugfs_create_file("trace", | |
abb14148 HS |
396 | S_IFREG|S_IRUGO|S_IWUSR, |
397 | fnic_trace_debugfs_root, | |
398 | &(fc_trc_flag->fnic_trace), | |
399 | &fnic_trace_debugfs_fops); | |
4d7007b4 HP |
400 | |
401 | if (!fnic_trace_debugfs_file) { | |
67125b02 HP |
402 | printk(KERN_DEBUG |
403 | "Cannot create trace file under debugfs\n"); | |
4d7007b4 HP |
404 | return rc; |
405 | } | |
406 | rc = 0; | |
407 | return rc; | |
408 | } | |
409 | ||
410 | /* | |
411 | * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure | |
412 | * | |
413 | * Description: | |
414 | * When Debugfs is configured this routine removes debugfs file system | |
415 | * elements that are specific to fnic trace logging. | |
416 | */ | |
417 | void fnic_trace_debugfs_terminate(void) | |
418 | { | |
abb14148 HS |
419 | debugfs_remove(fnic_trace_debugfs_file); |
420 | fnic_trace_debugfs_file = NULL; | |
421 | ||
422 | debugfs_remove(fnic_trace_enable); | |
423 | fnic_trace_enable = NULL; | |
424 | } | |
425 | ||
426 | /* | |
427 | * fnic_fc_trace_debugfs_init - | |
428 | * Initialize debugfs for fnic control frame trace logging | |
429 | * | |
430 | * Description: | |
431 | * When Debugfs is configured this routine sets up the fnic_fc debugfs | |
432 | * file system. If not already created, this routine will create the | |
433 | * create file trace to log fnic fc trace buffer output into debugfs and | |
434 | * it will also create file fc_trace_enable to control enable/disable of | |
435 | * trace logging into trace buffer. | |
436 | */ | |
437 | ||
438 | int fnic_fc_trace_debugfs_init(void) | |
439 | { | |
440 | int rc = -1; | |
441 | ||
442 | if (!fnic_trace_debugfs_root) { | |
443 | pr_err("fnic:Debugfs root directory doesn't exist\n"); | |
444 | return rc; | |
445 | } | |
446 | ||
447 | fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable", | |
448 | S_IFREG|S_IRUGO|S_IWUSR, | |
449 | fnic_trace_debugfs_root, | |
450 | &(fc_trc_flag->fc_trace), | |
451 | &fnic_trace_ctrl_fops); | |
452 | ||
453 | if (!fnic_fc_trace_enable) { | |
454 | pr_err("fnic: Failed create fc_trace_enable file\n"); | |
455 | return rc; | |
456 | } | |
457 | ||
458 | fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear", | |
459 | S_IFREG|S_IRUGO|S_IWUSR, | |
460 | fnic_trace_debugfs_root, | |
461 | &(fc_trc_flag->fc_clear), | |
462 | &fnic_trace_ctrl_fops); | |
463 | ||
464 | if (!fnic_fc_trace_clear) { | |
465 | pr_err("fnic: Failed to create fc_trace_enable file\n"); | |
466 | return rc; | |
467 | } | |
468 | ||
469 | fnic_fc_rdata_trace_debugfs_file = | |
470 | debugfs_create_file("fc_trace_rdata", | |
471 | S_IFREG|S_IRUGO|S_IWUSR, | |
472 | fnic_trace_debugfs_root, | |
473 | &(fc_trc_flag->fc_normal_file), | |
474 | &fnic_trace_debugfs_fops); | |
475 | ||
476 | if (!fnic_fc_rdata_trace_debugfs_file) { | |
477 | pr_err("fnic: Failed create fc_rdata_trace file\n"); | |
478 | return rc; | |
4d7007b4 | 479 | } |
abb14148 HS |
480 | |
481 | fnic_fc_trace_debugfs_file = | |
482 | debugfs_create_file("fc_trace", | |
483 | S_IFREG|S_IRUGO|S_IWUSR, | |
484 | fnic_trace_debugfs_root, | |
485 | &(fc_trc_flag->fc_row_file), | |
486 | &fnic_trace_debugfs_fops); | |
487 | ||
488 | if (!fnic_fc_trace_debugfs_file) { | |
489 | pr_err("fnic: Failed to create fc_trace file\n"); | |
490 | return rc; | |
4d7007b4 | 491 | } |
abb14148 HS |
492 | rc = 0; |
493 | return rc; | |
494 | } | |
495 | ||
496 | /* | |
497 | * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure | |
498 | * | |
499 | * Description: | |
500 | * When Debugfs is configured this routine removes debugfs file system | |
501 | * elements that are specific to fnic_fc trace logging. | |
502 | */ | |
503 | ||
504 | void fnic_fc_trace_debugfs_terminate(void) | |
505 | { | |
506 | debugfs_remove(fnic_fc_trace_debugfs_file); | |
507 | fnic_fc_trace_debugfs_file = NULL; | |
508 | ||
509 | debugfs_remove(fnic_fc_rdata_trace_debugfs_file); | |
510 | fnic_fc_rdata_trace_debugfs_file = NULL; | |
511 | ||
512 | debugfs_remove(fnic_fc_trace_enable); | |
513 | fnic_fc_trace_enable = NULL; | |
514 | ||
515 | debugfs_remove(fnic_fc_trace_clear); | |
516 | fnic_fc_trace_clear = NULL; | |
67125b02 HP |
517 | } |
518 | ||
519 | /* | |
520 | * fnic_reset_stats_open - Open the reset_stats file | |
521 | * @inode: The inode pointer. | |
522 | * @file: The file pointer to attach the stats reset flag. | |
523 | * | |
524 | * Description: | |
525 | * This routine opens a debugsfs file reset_stats and stores i_private data | |
526 | * to debug structure to retrieve later for while performing other | |
527 | * file oprations. | |
528 | * | |
529 | * Returns: | |
530 | * This function returns zero if successful. | |
531 | */ | |
532 | static int fnic_reset_stats_open(struct inode *inode, struct file *file) | |
533 | { | |
534 | struct stats_debug_info *debug; | |
535 | ||
536 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
537 | if (!debug) | |
538 | return -ENOMEM; | |
539 | ||
540 | debug->i_private = inode->i_private; | |
541 | ||
542 | file->private_data = debug; | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * fnic_reset_stats_read - Read a reset_stats debugfs file | |
549 | * @filp: The file pointer to read from. | |
550 | * @ubuf: The buffer to copy the data to. | |
551 | * @cnt: The number of bytes to read. | |
552 | * @ppos: The position in the file to start reading from. | |
553 | * | |
554 | * Description: | |
555 | * This routine reads value of variable reset_stats | |
556 | * and stores into local @buf. It will start reading file at @ppos and | |
557 | * copy up to @cnt of data to @ubuf from @buf. | |
558 | * | |
559 | * Returns: | |
560 | * This function returns the amount of data that was read. | |
561 | */ | |
562 | static ssize_t fnic_reset_stats_read(struct file *file, | |
563 | char __user *ubuf, | |
564 | size_t cnt, loff_t *ppos) | |
565 | { | |
566 | struct stats_debug_info *debug = file->private_data; | |
567 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
568 | char buf[64]; | |
569 | int len; | |
570 | ||
571 | len = sprintf(buf, "%u\n", fnic->reset_stats); | |
572 | ||
573 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); | |
574 | } | |
575 | ||
576 | /* | |
577 | * fnic_reset_stats_write - Write to reset_stats debugfs file | |
578 | * @filp: The file pointer to write from. | |
579 | * @ubuf: The buffer to copy the data from. | |
580 | * @cnt: The number of bytes to write. | |
581 | * @ppos: The position in the file to start writing to. | |
582 | * | |
583 | * Description: | |
584 | * This routine writes data from user buffer @ubuf to buffer @buf and | |
585 | * resets cumulative stats of fnic. | |
586 | * | |
587 | * Returns: | |
588 | * This function returns the amount of data that was written. | |
589 | */ | |
590 | static ssize_t fnic_reset_stats_write(struct file *file, | |
591 | const char __user *ubuf, | |
592 | size_t cnt, loff_t *ppos) | |
593 | { | |
594 | struct stats_debug_info *debug = file->private_data; | |
595 | struct fnic *fnic = (struct fnic *)debug->i_private; | |
596 | struct fnic_stats *stats = &fnic->fnic_stats; | |
597 | u64 *io_stats_p = (u64 *)&stats->io_stats; | |
598 | u64 *fw_stats_p = (u64 *)&stats->fw_stats; | |
599 | char buf[64]; | |
600 | unsigned long val; | |
601 | int ret; | |
602 | ||
603 | if (cnt >= sizeof(buf)) | |
604 | return -EINVAL; | |
605 | ||
606 | if (copy_from_user(&buf, ubuf, cnt)) | |
607 | return -EFAULT; | |
608 | ||
609 | buf[cnt] = 0; | |
610 | ||
611 | ret = kstrtoul(buf, 10, &val); | |
612 | if (ret < 0) | |
613 | return ret; | |
614 | ||
615 | fnic->reset_stats = val; | |
616 | ||
617 | if (fnic->reset_stats) { | |
618 | /* Skip variable is used to avoid descrepancies to Num IOs | |
619 | * and IO Completions stats. Skip incrementing No IO Compls | |
620 | * for pending active IOs after reset stats | |
621 | */ | |
622 | atomic64_set(&fnic->io_cmpl_skip, | |
623 | atomic64_read(&stats->io_stats.active_ios)); | |
624 | memset(&stats->abts_stats, 0, sizeof(struct abort_stats)); | |
625 | memset(&stats->term_stats, 0, | |
626 | sizeof(struct terminate_stats)); | |
627 | memset(&stats->reset_stats, 0, sizeof(struct reset_stats)); | |
628 | memset(&stats->misc_stats, 0, sizeof(struct misc_stats)); | |
629 | memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats)); | |
630 | memset(io_stats_p+1, 0, | |
631 | sizeof(struct io_path_stats) - sizeof(u64)); | |
632 | memset(fw_stats_p+1, 0, | |
633 | sizeof(struct fw_stats) - sizeof(u64)); | |
4d7007b4 | 634 | } |
67125b02 HP |
635 | |
636 | (*ppos)++; | |
637 | return cnt; | |
638 | } | |
639 | ||
640 | /* | |
641 | * fnic_reset_stats_release - Release the buffer used to store | |
642 | * debugfs file data | |
643 | * @inode: The inode pointer | |
644 | * @file: The file pointer that contains the buffer to release | |
645 | * | |
646 | * Description: | |
647 | * This routine frees the buffer that was allocated when the debugfs | |
648 | * file was opened. | |
649 | * | |
650 | * Returns: | |
651 | * This function returns zero. | |
652 | */ | |
653 | static int fnic_reset_stats_release(struct inode *inode, | |
654 | struct file *file) | |
655 | { | |
656 | struct stats_debug_info *debug = file->private_data; | |
657 | kfree(debug); | |
658 | return 0; | |
659 | } | |
660 | ||
661 | /* | |
662 | * fnic_stats_debugfs_open - Open the stats file for specific host | |
663 | * and get fnic stats. | |
664 | * @inode: The inode pointer. | |
665 | * @file: The file pointer to attach the specific host statistics. | |
666 | * | |
667 | * Description: | |
668 | * This routine opens a debugsfs file stats of specific host and print | |
669 | * fnic stats. | |
670 | * | |
671 | * Returns: | |
672 | * This function returns zero if successful. | |
673 | */ | |
674 | static int fnic_stats_debugfs_open(struct inode *inode, | |
675 | struct file *file) | |
676 | { | |
677 | struct fnic *fnic = inode->i_private; | |
678 | struct fnic_stats *fnic_stats = &fnic->fnic_stats; | |
679 | struct stats_debug_info *debug; | |
680 | int buf_size = 2 * PAGE_SIZE; | |
681 | ||
682 | debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL); | |
683 | if (!debug) | |
684 | return -ENOMEM; | |
685 | ||
686 | debug->debug_buffer = vmalloc(buf_size); | |
687 | if (!debug->debug_buffer) { | |
688 | kfree(debug); | |
689 | return -ENOMEM; | |
690 | } | |
691 | ||
692 | debug->buf_size = buf_size; | |
693 | memset((void *)debug->debug_buffer, 0, buf_size); | |
694 | debug->buffer_len = fnic_get_stats_data(debug, fnic_stats); | |
695 | ||
696 | file->private_data = debug; | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | /* | |
702 | * fnic_stats_debugfs_read - Read a debugfs file | |
703 | * @file: The file pointer to read from. | |
704 | * @ubuf: The buffer to copy the data to. | |
705 | * @nbytes: The number of bytes to read. | |
706 | * @pos: The position in the file to start reading from. | |
707 | * | |
708 | * Description: | |
709 | * This routine reads data from the buffer indicated in the private_data | |
710 | * field of @file. It will start reading at @pos and copy up to @nbytes of | |
711 | * data to @ubuf. | |
712 | * | |
713 | * Returns: | |
714 | * This function returns the amount of data that was read (this could be | |
715 | * less than @nbytes if the end of the file was reached). | |
716 | */ | |
717 | static ssize_t fnic_stats_debugfs_read(struct file *file, | |
718 | char __user *ubuf, | |
719 | size_t nbytes, | |
720 | loff_t *pos) | |
721 | { | |
722 | struct stats_debug_info *debug = file->private_data; | |
723 | int rc = 0; | |
724 | rc = simple_read_from_buffer(ubuf, nbytes, pos, | |
725 | debug->debug_buffer, | |
726 | debug->buffer_len); | |
727 | return rc; | |
728 | } | |
729 | ||
730 | /* | |
731 | * fnic_stats_stats_release - Release the buffer used to store | |
732 | * debugfs file data | |
733 | * @inode: The inode pointer | |
734 | * @file: The file pointer that contains the buffer to release | |
735 | * | |
736 | * Description: | |
737 | * This routine frees the buffer that was allocated when the debugfs | |
738 | * file was opened. | |
739 | * | |
740 | * Returns: | |
741 | * This function returns zero. | |
742 | */ | |
743 | static int fnic_stats_debugfs_release(struct inode *inode, | |
744 | struct file *file) | |
745 | { | |
746 | struct stats_debug_info *debug = file->private_data; | |
747 | vfree(debug->debug_buffer); | |
748 | kfree(debug); | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static const struct file_operations fnic_stats_debugfs_fops = { | |
753 | .owner = THIS_MODULE, | |
754 | .open = fnic_stats_debugfs_open, | |
755 | .read = fnic_stats_debugfs_read, | |
756 | .release = fnic_stats_debugfs_release, | |
757 | }; | |
758 | ||
759 | static const struct file_operations fnic_reset_debugfs_fops = { | |
760 | .owner = THIS_MODULE, | |
761 | .open = fnic_reset_stats_open, | |
762 | .read = fnic_reset_stats_read, | |
763 | .write = fnic_reset_stats_write, | |
764 | .release = fnic_reset_stats_release, | |
765 | }; | |
766 | ||
767 | /* | |
768 | * fnic_stats_init - Initialize stats struct and create stats file per fnic | |
769 | * | |
770 | * Description: | |
771 | * When Debugfs is configured this routine sets up the stats file per fnic | |
772 | * It will create file stats and reset_stats under statistics/host# directory | |
773 | * to log per fnic stats. | |
774 | */ | |
775 | int fnic_stats_debugfs_init(struct fnic *fnic) | |
776 | { | |
777 | int rc = -1; | |
778 | char name[16]; | |
779 | ||
780 | snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no); | |
781 | ||
782 | if (!fnic_stats_debugfs_root) { | |
783 | printk(KERN_DEBUG "fnic_stats root doesn't exist\n"); | |
784 | return rc; | |
785 | } | |
786 | fnic->fnic_stats_debugfs_host = debugfs_create_dir(name, | |
787 | fnic_stats_debugfs_root); | |
788 | if (!fnic->fnic_stats_debugfs_host) { | |
789 | printk(KERN_DEBUG "Cannot create host directory\n"); | |
790 | return rc; | |
791 | } | |
792 | ||
793 | fnic->fnic_stats_debugfs_file = debugfs_create_file("stats", | |
794 | S_IFREG|S_IRUGO|S_IWUSR, | |
795 | fnic->fnic_stats_debugfs_host, | |
796 | fnic, | |
797 | &fnic_stats_debugfs_fops); | |
798 | if (!fnic->fnic_stats_debugfs_file) { | |
799 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
800 | return rc; | |
801 | } | |
802 | ||
803 | fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats", | |
804 | S_IFREG|S_IRUGO|S_IWUSR, | |
805 | fnic->fnic_stats_debugfs_host, | |
806 | fnic, | |
807 | &fnic_reset_debugfs_fops); | |
808 | if (!fnic->fnic_reset_debugfs_file) { | |
809 | printk(KERN_DEBUG "Cannot create host stats file\n"); | |
810 | return rc; | |
811 | } | |
812 | rc = 0; | |
813 | return rc; | |
814 | } | |
815 | ||
816 | /* | |
817 | * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats | |
818 | * | |
819 | * Description: | |
820 | * When Debugfs is configured this routine removes debugfs file system | |
821 | * elements that are specific to fnic stats. | |
822 | */ | |
823 | void fnic_stats_debugfs_remove(struct fnic *fnic) | |
824 | { | |
825 | if (!fnic) | |
826 | return; | |
827 | ||
828 | debugfs_remove(fnic->fnic_stats_debugfs_file); | |
829 | fnic->fnic_stats_debugfs_file = NULL; | |
830 | ||
831 | debugfs_remove(fnic->fnic_reset_debugfs_file); | |
832 | fnic->fnic_reset_debugfs_file = NULL; | |
833 | ||
834 | debugfs_remove(fnic->fnic_stats_debugfs_host); | |
835 | fnic->fnic_stats_debugfs_host = NULL; | |
4d7007b4 | 836 | } |