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7ef224d1 TZ |
1 | /* |
2 | * trace_events_hist - trace event hist triggers | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com> | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/stacktrace.h> | |
22 | ||
23 | #include "tracing_map.h" | |
24 | #include "trace.h" | |
25 | ||
26 | struct hist_field; | |
27 | ||
28 | typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event); | |
29 | ||
30 | struct hist_field { | |
31 | struct ftrace_event_field *field; | |
32 | unsigned long flags; | |
33 | hist_field_fn_t fn; | |
34 | unsigned int size; | |
76a3b0c8 | 35 | unsigned int offset; |
7ef224d1 TZ |
36 | }; |
37 | ||
69a0200c TZ |
38 | static u64 hist_field_none(struct hist_field *field, void *event) |
39 | { | |
40 | return 0; | |
41 | } | |
42 | ||
7ef224d1 TZ |
43 | static u64 hist_field_counter(struct hist_field *field, void *event) |
44 | { | |
45 | return 1; | |
46 | } | |
47 | ||
48 | static u64 hist_field_string(struct hist_field *hist_field, void *event) | |
49 | { | |
50 | char *addr = (char *)(event + hist_field->field->offset); | |
51 | ||
52 | return (u64)(unsigned long)addr; | |
53 | } | |
54 | ||
79e577cb NK |
55 | static u64 hist_field_dynstring(struct hist_field *hist_field, void *event) |
56 | { | |
57 | u32 str_item = *(u32 *)(event + hist_field->field->offset); | |
58 | int str_loc = str_item & 0xffff; | |
59 | char *addr = (char *)(event + str_loc); | |
60 | ||
61 | return (u64)(unsigned long)addr; | |
62 | } | |
63 | ||
64 | static u64 hist_field_pstring(struct hist_field *hist_field, void *event) | |
65 | { | |
66 | char **addr = (char **)(event + hist_field->field->offset); | |
67 | ||
68 | return (u64)(unsigned long)*addr; | |
69 | } | |
70 | ||
4b94f5b7 NK |
71 | static u64 hist_field_log2(struct hist_field *hist_field, void *event) |
72 | { | |
73 | u64 val = *(u64 *)(event + hist_field->field->offset); | |
74 | ||
75 | return (u64) ilog2(roundup_pow_of_two(val)); | |
76 | } | |
77 | ||
7ef224d1 TZ |
78 | #define DEFINE_HIST_FIELD_FN(type) \ |
79 | static u64 hist_field_##type(struct hist_field *hist_field, void *event)\ | |
80 | { \ | |
81 | type *addr = (type *)(event + hist_field->field->offset); \ | |
82 | \ | |
79e577cb | 83 | return (u64)(unsigned long)*addr; \ |
7ef224d1 TZ |
84 | } |
85 | ||
86 | DEFINE_HIST_FIELD_FN(s64); | |
87 | DEFINE_HIST_FIELD_FN(u64); | |
88 | DEFINE_HIST_FIELD_FN(s32); | |
89 | DEFINE_HIST_FIELD_FN(u32); | |
90 | DEFINE_HIST_FIELD_FN(s16); | |
91 | DEFINE_HIST_FIELD_FN(u16); | |
92 | DEFINE_HIST_FIELD_FN(s8); | |
93 | DEFINE_HIST_FIELD_FN(u8); | |
94 | ||
95 | #define for_each_hist_field(i, hist_data) \ | |
96 | for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) | |
97 | ||
98 | #define for_each_hist_val_field(i, hist_data) \ | |
99 | for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) | |
100 | ||
101 | #define for_each_hist_key_field(i, hist_data) \ | |
102 | for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) | |
103 | ||
69a0200c TZ |
104 | #define HIST_STACKTRACE_DEPTH 16 |
105 | #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) | |
106 | #define HIST_STACKTRACE_SKIP 5 | |
107 | ||
7ef224d1 | 108 | #define HITCOUNT_IDX 0 |
69a0200c | 109 | #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) |
7ef224d1 TZ |
110 | |
111 | enum hist_field_flags { | |
c6afad49 TZ |
112 | HIST_FIELD_FL_HITCOUNT = 1, |
113 | HIST_FIELD_FL_KEY = 2, | |
114 | HIST_FIELD_FL_STRING = 4, | |
115 | HIST_FIELD_FL_HEX = 8, | |
116 | HIST_FIELD_FL_SYM = 16, | |
117 | HIST_FIELD_FL_SYM_OFFSET = 32, | |
6b4827ad | 118 | HIST_FIELD_FL_EXECNAME = 64, |
31696198 | 119 | HIST_FIELD_FL_SYSCALL = 128, |
69a0200c | 120 | HIST_FIELD_FL_STACKTRACE = 256, |
4b94f5b7 | 121 | HIST_FIELD_FL_LOG2 = 512, |
7ef224d1 TZ |
122 | }; |
123 | ||
124 | struct hist_trigger_attrs { | |
125 | char *keys_str; | |
f2606835 | 126 | char *vals_str; |
e62347d2 | 127 | char *sort_key_str; |
5463bfda | 128 | char *name; |
83e99914 TZ |
129 | bool pause; |
130 | bool cont; | |
e86ae9ba | 131 | bool clear; |
7ef224d1 TZ |
132 | unsigned int map_bits; |
133 | }; | |
134 | ||
135 | struct hist_trigger_data { | |
136 | struct hist_field *fields[TRACING_MAP_FIELDS_MAX]; | |
137 | unsigned int n_vals; | |
138 | unsigned int n_keys; | |
139 | unsigned int n_fields; | |
140 | unsigned int key_size; | |
141 | struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; | |
142 | unsigned int n_sort_keys; | |
143 | struct trace_event_file *event_file; | |
144 | struct hist_trigger_attrs *attrs; | |
145 | struct tracing_map *map; | |
146 | }; | |
147 | ||
148 | static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) | |
149 | { | |
150 | hist_field_fn_t fn = NULL; | |
151 | ||
152 | switch (field_size) { | |
153 | case 8: | |
154 | if (field_is_signed) | |
155 | fn = hist_field_s64; | |
156 | else | |
157 | fn = hist_field_u64; | |
158 | break; | |
159 | case 4: | |
160 | if (field_is_signed) | |
161 | fn = hist_field_s32; | |
162 | else | |
163 | fn = hist_field_u32; | |
164 | break; | |
165 | case 2: | |
166 | if (field_is_signed) | |
167 | fn = hist_field_s16; | |
168 | else | |
169 | fn = hist_field_u16; | |
170 | break; | |
171 | case 1: | |
172 | if (field_is_signed) | |
173 | fn = hist_field_s8; | |
174 | else | |
175 | fn = hist_field_u8; | |
176 | break; | |
177 | } | |
178 | ||
179 | return fn; | |
180 | } | |
181 | ||
182 | static int parse_map_size(char *str) | |
183 | { | |
184 | unsigned long size, map_bits; | |
185 | int ret; | |
186 | ||
187 | strsep(&str, "="); | |
188 | if (!str) { | |
189 | ret = -EINVAL; | |
190 | goto out; | |
191 | } | |
192 | ||
193 | ret = kstrtoul(str, 0, &size); | |
194 | if (ret) | |
195 | goto out; | |
196 | ||
197 | map_bits = ilog2(roundup_pow_of_two(size)); | |
198 | if (map_bits < TRACING_MAP_BITS_MIN || | |
199 | map_bits > TRACING_MAP_BITS_MAX) | |
200 | ret = -EINVAL; | |
201 | else | |
202 | ret = map_bits; | |
203 | out: | |
204 | return ret; | |
205 | } | |
206 | ||
207 | static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) | |
208 | { | |
209 | if (!attrs) | |
210 | return; | |
211 | ||
5463bfda | 212 | kfree(attrs->name); |
e62347d2 | 213 | kfree(attrs->sort_key_str); |
7ef224d1 | 214 | kfree(attrs->keys_str); |
f2606835 | 215 | kfree(attrs->vals_str); |
7ef224d1 TZ |
216 | kfree(attrs); |
217 | } | |
218 | ||
219 | static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str) | |
220 | { | |
221 | struct hist_trigger_attrs *attrs; | |
222 | int ret = 0; | |
223 | ||
224 | attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); | |
225 | if (!attrs) | |
226 | return ERR_PTR(-ENOMEM); | |
227 | ||
228 | while (trigger_str) { | |
229 | char *str = strsep(&trigger_str, ":"); | |
230 | ||
231 | if ((strncmp(str, "key=", strlen("key=")) == 0) || | |
232 | (strncmp(str, "keys=", strlen("keys=")) == 0)) | |
233 | attrs->keys_str = kstrdup(str, GFP_KERNEL); | |
f2606835 TZ |
234 | else if ((strncmp(str, "val=", strlen("val=")) == 0) || |
235 | (strncmp(str, "vals=", strlen("vals=")) == 0) || | |
236 | (strncmp(str, "values=", strlen("values=")) == 0)) | |
237 | attrs->vals_str = kstrdup(str, GFP_KERNEL); | |
e62347d2 TZ |
238 | else if (strncmp(str, "sort=", strlen("sort=")) == 0) |
239 | attrs->sort_key_str = kstrdup(str, GFP_KERNEL); | |
5463bfda TZ |
240 | else if (strncmp(str, "name=", strlen("name=")) == 0) |
241 | attrs->name = kstrdup(str, GFP_KERNEL); | |
83e99914 TZ |
242 | else if (strcmp(str, "pause") == 0) |
243 | attrs->pause = true; | |
244 | else if ((strcmp(str, "cont") == 0) || | |
245 | (strcmp(str, "continue") == 0)) | |
246 | attrs->cont = true; | |
e86ae9ba TZ |
247 | else if (strcmp(str, "clear") == 0) |
248 | attrs->clear = true; | |
7ef224d1 TZ |
249 | else if (strncmp(str, "size=", strlen("size=")) == 0) { |
250 | int map_bits = parse_map_size(str); | |
251 | ||
252 | if (map_bits < 0) { | |
253 | ret = map_bits; | |
254 | goto free; | |
255 | } | |
256 | attrs->map_bits = map_bits; | |
257 | } else { | |
258 | ret = -EINVAL; | |
259 | goto free; | |
260 | } | |
261 | } | |
262 | ||
263 | if (!attrs->keys_str) { | |
264 | ret = -EINVAL; | |
265 | goto free; | |
266 | } | |
267 | ||
268 | return attrs; | |
269 | free: | |
270 | destroy_hist_trigger_attrs(attrs); | |
271 | ||
272 | return ERR_PTR(ret); | |
273 | } | |
274 | ||
6b4827ad TZ |
275 | static inline void save_comm(char *comm, struct task_struct *task) |
276 | { | |
277 | if (!task->pid) { | |
278 | strcpy(comm, "<idle>"); | |
279 | return; | |
280 | } | |
281 | ||
282 | if (WARN_ON_ONCE(task->pid < 0)) { | |
283 | strcpy(comm, "<XXX>"); | |
284 | return; | |
285 | } | |
286 | ||
287 | memcpy(comm, task->comm, TASK_COMM_LEN); | |
288 | } | |
289 | ||
290 | static void hist_trigger_elt_comm_free(struct tracing_map_elt *elt) | |
291 | { | |
292 | kfree((char *)elt->private_data); | |
293 | } | |
294 | ||
295 | static int hist_trigger_elt_comm_alloc(struct tracing_map_elt *elt) | |
296 | { | |
297 | struct hist_trigger_data *hist_data = elt->map->private_data; | |
298 | struct hist_field *key_field; | |
299 | unsigned int i; | |
300 | ||
301 | for_each_hist_key_field(i, hist_data) { | |
302 | key_field = hist_data->fields[i]; | |
303 | ||
304 | if (key_field->flags & HIST_FIELD_FL_EXECNAME) { | |
305 | unsigned int size = TASK_COMM_LEN + 1; | |
306 | ||
307 | elt->private_data = kzalloc(size, GFP_KERNEL); | |
308 | if (!elt->private_data) | |
309 | return -ENOMEM; | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static void hist_trigger_elt_comm_copy(struct tracing_map_elt *to, | |
318 | struct tracing_map_elt *from) | |
319 | { | |
320 | char *comm_from = from->private_data; | |
321 | char *comm_to = to->private_data; | |
322 | ||
323 | if (comm_from) | |
324 | memcpy(comm_to, comm_from, TASK_COMM_LEN + 1); | |
325 | } | |
326 | ||
327 | static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt) | |
328 | { | |
329 | char *comm = elt->private_data; | |
330 | ||
331 | if (comm) | |
332 | save_comm(comm, current); | |
333 | } | |
334 | ||
335 | static const struct tracing_map_ops hist_trigger_elt_comm_ops = { | |
336 | .elt_alloc = hist_trigger_elt_comm_alloc, | |
337 | .elt_copy = hist_trigger_elt_comm_copy, | |
338 | .elt_free = hist_trigger_elt_comm_free, | |
339 | .elt_init = hist_trigger_elt_comm_init, | |
340 | }; | |
341 | ||
7ef224d1 TZ |
342 | static void destroy_hist_field(struct hist_field *hist_field) |
343 | { | |
344 | kfree(hist_field); | |
345 | } | |
346 | ||
347 | static struct hist_field *create_hist_field(struct ftrace_event_field *field, | |
348 | unsigned long flags) | |
349 | { | |
350 | struct hist_field *hist_field; | |
351 | ||
352 | if (field && is_function_field(field)) | |
353 | return NULL; | |
354 | ||
355 | hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
356 | if (!hist_field) | |
357 | return NULL; | |
358 | ||
359 | if (flags & HIST_FIELD_FL_HITCOUNT) { | |
360 | hist_field->fn = hist_field_counter; | |
361 | goto out; | |
362 | } | |
363 | ||
69a0200c TZ |
364 | if (flags & HIST_FIELD_FL_STACKTRACE) { |
365 | hist_field->fn = hist_field_none; | |
366 | goto out; | |
367 | } | |
368 | ||
4b94f5b7 NK |
369 | if (flags & HIST_FIELD_FL_LOG2) { |
370 | hist_field->fn = hist_field_log2; | |
371 | goto out; | |
372 | } | |
373 | ||
7ef224d1 TZ |
374 | if (is_string_field(field)) { |
375 | flags |= HIST_FIELD_FL_STRING; | |
79e577cb NK |
376 | |
377 | if (field->filter_type == FILTER_STATIC_STRING) | |
378 | hist_field->fn = hist_field_string; | |
379 | else if (field->filter_type == FILTER_DYN_STRING) | |
380 | hist_field->fn = hist_field_dynstring; | |
381 | else | |
382 | hist_field->fn = hist_field_pstring; | |
7ef224d1 TZ |
383 | } else { |
384 | hist_field->fn = select_value_fn(field->size, | |
385 | field->is_signed); | |
386 | if (!hist_field->fn) { | |
387 | destroy_hist_field(hist_field); | |
388 | return NULL; | |
389 | } | |
390 | } | |
391 | out: | |
392 | hist_field->field = field; | |
393 | hist_field->flags = flags; | |
394 | ||
395 | return hist_field; | |
396 | } | |
397 | ||
398 | static void destroy_hist_fields(struct hist_trigger_data *hist_data) | |
399 | { | |
400 | unsigned int i; | |
401 | ||
402 | for (i = 0; i < TRACING_MAP_FIELDS_MAX; i++) { | |
403 | if (hist_data->fields[i]) { | |
404 | destroy_hist_field(hist_data->fields[i]); | |
405 | hist_data->fields[i] = NULL; | |
406 | } | |
407 | } | |
408 | } | |
409 | ||
410 | static int create_hitcount_val(struct hist_trigger_data *hist_data) | |
411 | { | |
412 | hist_data->fields[HITCOUNT_IDX] = | |
413 | create_hist_field(NULL, HIST_FIELD_FL_HITCOUNT); | |
414 | if (!hist_data->fields[HITCOUNT_IDX]) | |
415 | return -ENOMEM; | |
416 | ||
417 | hist_data->n_vals++; | |
418 | ||
419 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) | |
420 | return -EINVAL; | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
f2606835 TZ |
425 | static int create_val_field(struct hist_trigger_data *hist_data, |
426 | unsigned int val_idx, | |
427 | struct trace_event_file *file, | |
428 | char *field_str) | |
429 | { | |
430 | struct ftrace_event_field *field = NULL; | |
431 | unsigned long flags = 0; | |
0c4a6b46 | 432 | char *field_name; |
f2606835 TZ |
433 | int ret = 0; |
434 | ||
435 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) | |
436 | return -EINVAL; | |
0c4a6b46 TZ |
437 | |
438 | field_name = strsep(&field_str, "."); | |
439 | if (field_str) { | |
440 | if (strcmp(field_str, "hex") == 0) | |
441 | flags |= HIST_FIELD_FL_HEX; | |
442 | else { | |
443 | ret = -EINVAL; | |
444 | goto out; | |
445 | } | |
446 | } | |
447 | ||
448 | field = trace_find_event_field(file->event_call, field_name); | |
f2606835 TZ |
449 | if (!field) { |
450 | ret = -EINVAL; | |
451 | goto out; | |
452 | } | |
453 | ||
454 | hist_data->fields[val_idx] = create_hist_field(field, flags); | |
455 | if (!hist_data->fields[val_idx]) { | |
456 | ret = -ENOMEM; | |
457 | goto out; | |
458 | } | |
459 | ||
460 | ++hist_data->n_vals; | |
461 | ||
462 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) | |
463 | ret = -EINVAL; | |
464 | out: | |
465 | return ret; | |
466 | } | |
467 | ||
7ef224d1 TZ |
468 | static int create_val_fields(struct hist_trigger_data *hist_data, |
469 | struct trace_event_file *file) | |
470 | { | |
f2606835 TZ |
471 | char *fields_str, *field_str; |
472 | unsigned int i, j; | |
7ef224d1 TZ |
473 | int ret; |
474 | ||
475 | ret = create_hitcount_val(hist_data); | |
f2606835 TZ |
476 | if (ret) |
477 | goto out; | |
7ef224d1 | 478 | |
f2606835 TZ |
479 | fields_str = hist_data->attrs->vals_str; |
480 | if (!fields_str) | |
481 | goto out; | |
482 | ||
483 | strsep(&fields_str, "="); | |
484 | if (!fields_str) | |
485 | goto out; | |
486 | ||
487 | for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && | |
488 | j < TRACING_MAP_VALS_MAX; i++) { | |
489 | field_str = strsep(&fields_str, ","); | |
490 | if (!field_str) | |
491 | break; | |
492 | if (strcmp(field_str, "hitcount") == 0) | |
493 | continue; | |
494 | ret = create_val_field(hist_data, j++, file, field_str); | |
495 | if (ret) | |
496 | goto out; | |
497 | } | |
498 | if (fields_str && (strcmp(fields_str, "hitcount") != 0)) | |
499 | ret = -EINVAL; | |
500 | out: | |
7ef224d1 TZ |
501 | return ret; |
502 | } | |
503 | ||
504 | static int create_key_field(struct hist_trigger_data *hist_data, | |
505 | unsigned int key_idx, | |
76a3b0c8 | 506 | unsigned int key_offset, |
7ef224d1 TZ |
507 | struct trace_event_file *file, |
508 | char *field_str) | |
509 | { | |
510 | struct ftrace_event_field *field = NULL; | |
511 | unsigned long flags = 0; | |
512 | unsigned int key_size; | |
513 | int ret = 0; | |
514 | ||
515 | if (WARN_ON(key_idx >= TRACING_MAP_FIELDS_MAX)) | |
516 | return -EINVAL; | |
517 | ||
518 | flags |= HIST_FIELD_FL_KEY; | |
519 | ||
69a0200c TZ |
520 | if (strcmp(field_str, "stacktrace") == 0) { |
521 | flags |= HIST_FIELD_FL_STACKTRACE; | |
522 | key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; | |
523 | } else { | |
524 | char *field_name = strsep(&field_str, "."); | |
525 | ||
526 | if (field_str) { | |
527 | if (strcmp(field_str, "hex") == 0) | |
528 | flags |= HIST_FIELD_FL_HEX; | |
529 | else if (strcmp(field_str, "sym") == 0) | |
530 | flags |= HIST_FIELD_FL_SYM; | |
531 | else if (strcmp(field_str, "sym-offset") == 0) | |
532 | flags |= HIST_FIELD_FL_SYM_OFFSET; | |
533 | else if ((strcmp(field_str, "execname") == 0) && | |
534 | (strcmp(field_name, "common_pid") == 0)) | |
535 | flags |= HIST_FIELD_FL_EXECNAME; | |
536 | else if (strcmp(field_str, "syscall") == 0) | |
537 | flags |= HIST_FIELD_FL_SYSCALL; | |
4b94f5b7 NK |
538 | else if (strcmp(field_str, "log2") == 0) |
539 | flags |= HIST_FIELD_FL_LOG2; | |
69a0200c TZ |
540 | else { |
541 | ret = -EINVAL; | |
542 | goto out; | |
543 | } | |
544 | } | |
545 | ||
546 | field = trace_find_event_field(file->event_call, field_name); | |
547 | if (!field) { | |
0c4a6b46 TZ |
548 | ret = -EINVAL; |
549 | goto out; | |
550 | } | |
0c4a6b46 | 551 | |
6a475cb1 TZ |
552 | if (is_string_field(field)) |
553 | key_size = MAX_FILTER_STR_VAL; | |
79e577cb NK |
554 | else |
555 | key_size = field->size; | |
7ef224d1 TZ |
556 | } |
557 | ||
7ef224d1 TZ |
558 | hist_data->fields[key_idx] = create_hist_field(field, flags); |
559 | if (!hist_data->fields[key_idx]) { | |
560 | ret = -ENOMEM; | |
561 | goto out; | |
562 | } | |
563 | ||
564 | key_size = ALIGN(key_size, sizeof(u64)); | |
565 | hist_data->fields[key_idx]->size = key_size; | |
76a3b0c8 TZ |
566 | hist_data->fields[key_idx]->offset = key_offset; |
567 | hist_data->key_size += key_size; | |
7ef224d1 TZ |
568 | if (hist_data->key_size > HIST_KEY_SIZE_MAX) { |
569 | ret = -EINVAL; | |
570 | goto out; | |
571 | } | |
572 | ||
573 | hist_data->n_keys++; | |
574 | ||
575 | if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) | |
576 | return -EINVAL; | |
577 | ||
578 | ret = key_size; | |
579 | out: | |
580 | return ret; | |
581 | } | |
582 | ||
583 | static int create_key_fields(struct hist_trigger_data *hist_data, | |
584 | struct trace_event_file *file) | |
585 | { | |
76a3b0c8 | 586 | unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; |
7ef224d1 TZ |
587 | char *fields_str, *field_str; |
588 | int ret = -EINVAL; | |
589 | ||
590 | fields_str = hist_data->attrs->keys_str; | |
591 | if (!fields_str) | |
592 | goto out; | |
593 | ||
594 | strsep(&fields_str, "="); | |
595 | if (!fields_str) | |
596 | goto out; | |
597 | ||
76a3b0c8 | 598 | for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { |
7ef224d1 TZ |
599 | field_str = strsep(&fields_str, ","); |
600 | if (!field_str) | |
601 | break; | |
76a3b0c8 TZ |
602 | ret = create_key_field(hist_data, i, key_offset, |
603 | file, field_str); | |
7ef224d1 TZ |
604 | if (ret < 0) |
605 | goto out; | |
76a3b0c8 | 606 | key_offset += ret; |
7ef224d1 TZ |
607 | } |
608 | if (fields_str) { | |
609 | ret = -EINVAL; | |
610 | goto out; | |
611 | } | |
612 | ret = 0; | |
613 | out: | |
614 | return ret; | |
615 | } | |
616 | ||
617 | static int create_hist_fields(struct hist_trigger_data *hist_data, | |
618 | struct trace_event_file *file) | |
619 | { | |
620 | int ret; | |
621 | ||
622 | ret = create_val_fields(hist_data, file); | |
623 | if (ret) | |
624 | goto out; | |
625 | ||
626 | ret = create_key_fields(hist_data, file); | |
627 | if (ret) | |
628 | goto out; | |
629 | ||
630 | hist_data->n_fields = hist_data->n_vals + hist_data->n_keys; | |
631 | out: | |
632 | return ret; | |
633 | } | |
634 | ||
e62347d2 TZ |
635 | static int is_descending(const char *str) |
636 | { | |
637 | if (!str) | |
638 | return 0; | |
639 | ||
640 | if (strcmp(str, "descending") == 0) | |
641 | return 1; | |
642 | ||
643 | if (strcmp(str, "ascending") == 0) | |
644 | return 0; | |
645 | ||
646 | return -EINVAL; | |
647 | } | |
648 | ||
7ef224d1 TZ |
649 | static int create_sort_keys(struct hist_trigger_data *hist_data) |
650 | { | |
e62347d2 TZ |
651 | char *fields_str = hist_data->attrs->sort_key_str; |
652 | struct ftrace_event_field *field = NULL; | |
653 | struct tracing_map_sort_key *sort_key; | |
654 | int descending, ret = 0; | |
655 | unsigned int i, j; | |
656 | ||
657 | hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ | |
658 | ||
659 | if (!fields_str) | |
660 | goto out; | |
661 | ||
662 | strsep(&fields_str, "="); | |
663 | if (!fields_str) { | |
664 | ret = -EINVAL; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { | |
669 | char *field_str, *field_name; | |
670 | ||
671 | sort_key = &hist_data->sort_keys[i]; | |
672 | ||
673 | field_str = strsep(&fields_str, ","); | |
674 | if (!field_str) { | |
675 | if (i == 0) | |
676 | ret = -EINVAL; | |
677 | break; | |
678 | } | |
679 | ||
680 | if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { | |
681 | ret = -EINVAL; | |
682 | break; | |
683 | } | |
7ef224d1 | 684 | |
e62347d2 TZ |
685 | field_name = strsep(&field_str, "."); |
686 | if (!field_name) { | |
687 | ret = -EINVAL; | |
688 | break; | |
689 | } | |
690 | ||
691 | if (strcmp(field_name, "hitcount") == 0) { | |
692 | descending = is_descending(field_str); | |
693 | if (descending < 0) { | |
694 | ret = descending; | |
695 | break; | |
696 | } | |
697 | sort_key->descending = descending; | |
698 | continue; | |
699 | } | |
7ef224d1 | 700 | |
e62347d2 TZ |
701 | for (j = 1; j < hist_data->n_fields; j++) { |
702 | field = hist_data->fields[j]->field; | |
703 | if (field && (strcmp(field_name, field->name) == 0)) { | |
704 | sort_key->field_idx = j; | |
705 | descending = is_descending(field_str); | |
706 | if (descending < 0) { | |
707 | ret = descending; | |
708 | goto out; | |
709 | } | |
710 | sort_key->descending = descending; | |
711 | break; | |
712 | } | |
713 | } | |
714 | if (j == hist_data->n_fields) { | |
715 | ret = -EINVAL; | |
716 | break; | |
717 | } | |
718 | } | |
719 | hist_data->n_sort_keys = i; | |
720 | out: | |
7ef224d1 TZ |
721 | return ret; |
722 | } | |
723 | ||
724 | static void destroy_hist_data(struct hist_trigger_data *hist_data) | |
725 | { | |
726 | destroy_hist_trigger_attrs(hist_data->attrs); | |
727 | destroy_hist_fields(hist_data); | |
728 | tracing_map_destroy(hist_data->map); | |
729 | kfree(hist_data); | |
730 | } | |
731 | ||
732 | static int create_tracing_map_fields(struct hist_trigger_data *hist_data) | |
733 | { | |
734 | struct tracing_map *map = hist_data->map; | |
735 | struct ftrace_event_field *field; | |
736 | struct hist_field *hist_field; | |
737 | unsigned int i, idx; | |
738 | ||
739 | for_each_hist_field(i, hist_data) { | |
740 | hist_field = hist_data->fields[i]; | |
741 | if (hist_field->flags & HIST_FIELD_FL_KEY) { | |
742 | tracing_map_cmp_fn_t cmp_fn; | |
743 | ||
744 | field = hist_field->field; | |
745 | ||
69a0200c TZ |
746 | if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
747 | cmp_fn = tracing_map_cmp_none; | |
748 | else if (is_string_field(field)) | |
7ef224d1 TZ |
749 | cmp_fn = tracing_map_cmp_string; |
750 | else | |
751 | cmp_fn = tracing_map_cmp_num(field->size, | |
752 | field->is_signed); | |
76a3b0c8 TZ |
753 | idx = tracing_map_add_key_field(map, |
754 | hist_field->offset, | |
755 | cmp_fn); | |
756 | ||
7ef224d1 TZ |
757 | } else |
758 | idx = tracing_map_add_sum_field(map); | |
759 | ||
760 | if (idx < 0) | |
761 | return idx; | |
762 | } | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
6b4827ad TZ |
767 | static bool need_tracing_map_ops(struct hist_trigger_data *hist_data) |
768 | { | |
769 | struct hist_field *key_field; | |
770 | unsigned int i; | |
771 | ||
772 | for_each_hist_key_field(i, hist_data) { | |
773 | key_field = hist_data->fields[i]; | |
774 | ||
775 | if (key_field->flags & HIST_FIELD_FL_EXECNAME) | |
776 | return true; | |
777 | } | |
778 | ||
779 | return false; | |
780 | } | |
781 | ||
7ef224d1 TZ |
782 | static struct hist_trigger_data * |
783 | create_hist_data(unsigned int map_bits, | |
784 | struct hist_trigger_attrs *attrs, | |
785 | struct trace_event_file *file) | |
786 | { | |
6b4827ad | 787 | const struct tracing_map_ops *map_ops = NULL; |
7ef224d1 TZ |
788 | struct hist_trigger_data *hist_data; |
789 | int ret = 0; | |
790 | ||
791 | hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); | |
792 | if (!hist_data) | |
793 | return ERR_PTR(-ENOMEM); | |
794 | ||
795 | hist_data->attrs = attrs; | |
796 | ||
797 | ret = create_hist_fields(hist_data, file); | |
798 | if (ret) | |
799 | goto free; | |
800 | ||
801 | ret = create_sort_keys(hist_data); | |
802 | if (ret) | |
803 | goto free; | |
804 | ||
6b4827ad TZ |
805 | if (need_tracing_map_ops(hist_data)) |
806 | map_ops = &hist_trigger_elt_comm_ops; | |
807 | ||
7ef224d1 | 808 | hist_data->map = tracing_map_create(map_bits, hist_data->key_size, |
6b4827ad | 809 | map_ops, hist_data); |
7ef224d1 TZ |
810 | if (IS_ERR(hist_data->map)) { |
811 | ret = PTR_ERR(hist_data->map); | |
812 | hist_data->map = NULL; | |
813 | goto free; | |
814 | } | |
815 | ||
816 | ret = create_tracing_map_fields(hist_data); | |
817 | if (ret) | |
818 | goto free; | |
819 | ||
820 | ret = tracing_map_init(hist_data->map); | |
821 | if (ret) | |
822 | goto free; | |
823 | ||
824 | hist_data->event_file = file; | |
825 | out: | |
826 | return hist_data; | |
827 | free: | |
828 | hist_data->attrs = NULL; | |
829 | ||
830 | destroy_hist_data(hist_data); | |
831 | ||
832 | hist_data = ERR_PTR(ret); | |
833 | ||
834 | goto out; | |
835 | } | |
836 | ||
837 | static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, | |
838 | struct tracing_map_elt *elt, | |
839 | void *rec) | |
840 | { | |
841 | struct hist_field *hist_field; | |
842 | unsigned int i; | |
843 | u64 hist_val; | |
844 | ||
845 | for_each_hist_val_field(i, hist_data) { | |
846 | hist_field = hist_data->fields[i]; | |
847 | hist_val = hist_field->fn(hist_field, rec); | |
848 | tracing_map_update_sum(elt, i, hist_val); | |
849 | } | |
850 | } | |
851 | ||
6a475cb1 TZ |
852 | static inline void add_to_key(char *compound_key, void *key, |
853 | struct hist_field *key_field, void *rec) | |
854 | { | |
855 | size_t size = key_field->size; | |
856 | ||
857 | if (key_field->flags & HIST_FIELD_FL_STRING) { | |
858 | struct ftrace_event_field *field; | |
859 | ||
860 | field = key_field->field; | |
861 | if (field->filter_type == FILTER_DYN_STRING) | |
862 | size = *(u32 *)(rec + field->offset) >> 16; | |
863 | else if (field->filter_type == FILTER_PTR_STRING) | |
864 | size = strlen(key); | |
865 | else if (field->filter_type == FILTER_STATIC_STRING) | |
866 | size = field->size; | |
867 | ||
868 | /* ensure NULL-termination */ | |
869 | if (size > key_field->size - 1) | |
870 | size = key_field->size - 1; | |
871 | } | |
872 | ||
873 | memcpy(compound_key + key_field->offset, key, size); | |
874 | } | |
875 | ||
7ef224d1 TZ |
876 | static void event_hist_trigger(struct event_trigger_data *data, void *rec) |
877 | { | |
878 | struct hist_trigger_data *hist_data = data->private_data; | |
6a475cb1 | 879 | bool use_compound_key = (hist_data->n_keys > 1); |
69a0200c | 880 | unsigned long entries[HIST_STACKTRACE_DEPTH]; |
76a3b0c8 | 881 | char compound_key[HIST_KEY_SIZE_MAX]; |
69a0200c | 882 | struct stack_trace stacktrace; |
7ef224d1 TZ |
883 | struct hist_field *key_field; |
884 | struct tracing_map_elt *elt; | |
885 | u64 field_contents; | |
886 | void *key = NULL; | |
887 | unsigned int i; | |
888 | ||
6a475cb1 | 889 | memset(compound_key, 0, hist_data->key_size); |
76a3b0c8 | 890 | |
7ef224d1 TZ |
891 | for_each_hist_key_field(i, hist_data) { |
892 | key_field = hist_data->fields[i]; | |
893 | ||
69a0200c TZ |
894 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
895 | stacktrace.max_entries = HIST_STACKTRACE_DEPTH; | |
896 | stacktrace.entries = entries; | |
897 | stacktrace.nr_entries = 0; | |
898 | stacktrace.skip = HIST_STACKTRACE_SKIP; | |
76a3b0c8 | 899 | |
69a0200c TZ |
900 | memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE); |
901 | save_stack_trace(&stacktrace); | |
902 | ||
903 | key = entries; | |
904 | } else { | |
905 | field_contents = key_field->fn(key_field, rec); | |
6a475cb1 | 906 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
69a0200c | 907 | key = (void *)(unsigned long)field_contents; |
6a475cb1 TZ |
908 | use_compound_key = true; |
909 | } else | |
69a0200c | 910 | key = (void *)&field_contents; |
76a3b0c8 | 911 | } |
6a475cb1 TZ |
912 | |
913 | if (use_compound_key) | |
914 | add_to_key(compound_key, key, key_field, rec); | |
7ef224d1 TZ |
915 | } |
916 | ||
6a475cb1 | 917 | if (use_compound_key) |
76a3b0c8 TZ |
918 | key = compound_key; |
919 | ||
7ef224d1 TZ |
920 | elt = tracing_map_insert(hist_data->map, key); |
921 | if (elt) | |
922 | hist_trigger_elt_update(hist_data, elt, rec); | |
923 | } | |
924 | ||
69a0200c TZ |
925 | static void hist_trigger_stacktrace_print(struct seq_file *m, |
926 | unsigned long *stacktrace_entries, | |
927 | unsigned int max_entries) | |
928 | { | |
929 | char str[KSYM_SYMBOL_LEN]; | |
930 | unsigned int spaces = 8; | |
931 | unsigned int i; | |
932 | ||
933 | for (i = 0; i < max_entries; i++) { | |
934 | if (stacktrace_entries[i] == ULONG_MAX) | |
935 | return; | |
936 | ||
937 | seq_printf(m, "%*c", 1 + spaces, ' '); | |
938 | sprint_symbol(str, stacktrace_entries[i]); | |
939 | seq_printf(m, "%s\n", str); | |
940 | } | |
941 | } | |
942 | ||
7ef224d1 TZ |
943 | static void |
944 | hist_trigger_entry_print(struct seq_file *m, | |
945 | struct hist_trigger_data *hist_data, void *key, | |
946 | struct tracing_map_elt *elt) | |
947 | { | |
948 | struct hist_field *key_field; | |
c6afad49 | 949 | char str[KSYM_SYMBOL_LEN]; |
69a0200c | 950 | bool multiline = false; |
7ef224d1 TZ |
951 | unsigned int i; |
952 | u64 uval; | |
953 | ||
954 | seq_puts(m, "{ "); | |
955 | ||
956 | for_each_hist_key_field(i, hist_data) { | |
957 | key_field = hist_data->fields[i]; | |
958 | ||
959 | if (i > hist_data->n_vals) | |
960 | seq_puts(m, ", "); | |
961 | ||
0c4a6b46 TZ |
962 | if (key_field->flags & HIST_FIELD_FL_HEX) { |
963 | uval = *(u64 *)(key + key_field->offset); | |
964 | seq_printf(m, "%s: %llx", | |
965 | key_field->field->name, uval); | |
c6afad49 TZ |
966 | } else if (key_field->flags & HIST_FIELD_FL_SYM) { |
967 | uval = *(u64 *)(key + key_field->offset); | |
968 | sprint_symbol_no_offset(str, uval); | |
969 | seq_printf(m, "%s: [%llx] %-45s", | |
970 | key_field->field->name, uval, str); | |
971 | } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { | |
972 | uval = *(u64 *)(key + key_field->offset); | |
973 | sprint_symbol(str, uval); | |
974 | seq_printf(m, "%s: [%llx] %-55s", | |
975 | key_field->field->name, uval, str); | |
6b4827ad TZ |
976 | } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { |
977 | char *comm = elt->private_data; | |
978 | ||
979 | uval = *(u64 *)(key + key_field->offset); | |
980 | seq_printf(m, "%s: %-16s[%10llu]", | |
981 | key_field->field->name, comm, uval); | |
31696198 TZ |
982 | } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { |
983 | const char *syscall_name; | |
984 | ||
985 | uval = *(u64 *)(key + key_field->offset); | |
986 | syscall_name = get_syscall_name(uval); | |
987 | if (!syscall_name) | |
988 | syscall_name = "unknown_syscall"; | |
989 | ||
990 | seq_printf(m, "%s: %-30s[%3llu]", | |
991 | key_field->field->name, syscall_name, uval); | |
69a0200c TZ |
992 | } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
993 | seq_puts(m, "stacktrace:\n"); | |
994 | hist_trigger_stacktrace_print(m, | |
995 | key + key_field->offset, | |
996 | HIST_STACKTRACE_DEPTH); | |
997 | multiline = true; | |
4b94f5b7 NK |
998 | } else if (key_field->flags & HIST_FIELD_FL_LOG2) { |
999 | seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name, | |
1000 | *(u64 *)(key + key_field->offset)); | |
0c4a6b46 | 1001 | } else if (key_field->flags & HIST_FIELD_FL_STRING) { |
7ef224d1 | 1002 | seq_printf(m, "%s: %-50s", key_field->field->name, |
76a3b0c8 | 1003 | (char *)(key + key_field->offset)); |
7ef224d1 | 1004 | } else { |
76a3b0c8 TZ |
1005 | uval = *(u64 *)(key + key_field->offset); |
1006 | seq_printf(m, "%s: %10llu", key_field->field->name, | |
1007 | uval); | |
7ef224d1 TZ |
1008 | } |
1009 | } | |
1010 | ||
69a0200c TZ |
1011 | if (!multiline) |
1012 | seq_puts(m, " "); | |
1013 | ||
1014 | seq_puts(m, "}"); | |
7ef224d1 TZ |
1015 | |
1016 | seq_printf(m, " hitcount: %10llu", | |
1017 | tracing_map_read_sum(elt, HITCOUNT_IDX)); | |
1018 | ||
f2606835 | 1019 | for (i = 1; i < hist_data->n_vals; i++) { |
0c4a6b46 TZ |
1020 | if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { |
1021 | seq_printf(m, " %s: %10llx", | |
1022 | hist_data->fields[i]->field->name, | |
1023 | tracing_map_read_sum(elt, i)); | |
1024 | } else { | |
1025 | seq_printf(m, " %s: %10llu", | |
1026 | hist_data->fields[i]->field->name, | |
1027 | tracing_map_read_sum(elt, i)); | |
1028 | } | |
f2606835 TZ |
1029 | } |
1030 | ||
7ef224d1 TZ |
1031 | seq_puts(m, "\n"); |
1032 | } | |
1033 | ||
1034 | static int print_entries(struct seq_file *m, | |
1035 | struct hist_trigger_data *hist_data) | |
1036 | { | |
1037 | struct tracing_map_sort_entry **sort_entries = NULL; | |
1038 | struct tracing_map *map = hist_data->map; | |
1039 | unsigned int i, n_entries; | |
1040 | ||
1041 | n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, | |
1042 | hist_data->n_sort_keys, | |
1043 | &sort_entries); | |
1044 | if (n_entries < 0) | |
1045 | return n_entries; | |
1046 | ||
1047 | for (i = 0; i < n_entries; i++) | |
1048 | hist_trigger_entry_print(m, hist_data, | |
1049 | sort_entries[i]->key, | |
1050 | sort_entries[i]->elt); | |
1051 | ||
1052 | tracing_map_destroy_sort_entries(sort_entries, n_entries); | |
1053 | ||
1054 | return n_entries; | |
1055 | } | |
1056 | ||
52a7f16d TZ |
1057 | static void hist_trigger_show(struct seq_file *m, |
1058 | struct event_trigger_data *data, int n) | |
7ef224d1 | 1059 | { |
7ef224d1 TZ |
1060 | struct hist_trigger_data *hist_data; |
1061 | int n_entries, ret = 0; | |
1062 | ||
52a7f16d TZ |
1063 | if (n > 0) |
1064 | seq_puts(m, "\n\n"); | |
7ef224d1 TZ |
1065 | |
1066 | seq_puts(m, "# event histogram\n#\n# trigger info: "); | |
1067 | data->ops->print(m, data->ops, data); | |
52a7f16d | 1068 | seq_puts(m, "#\n\n"); |
7ef224d1 TZ |
1069 | |
1070 | hist_data = data->private_data; | |
1071 | n_entries = print_entries(m, hist_data); | |
1072 | if (n_entries < 0) { | |
1073 | ret = n_entries; | |
1074 | n_entries = 0; | |
1075 | } | |
1076 | ||
1077 | seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", | |
1078 | (u64)atomic64_read(&hist_data->map->hits), | |
1079 | n_entries, (u64)atomic64_read(&hist_data->map->drops)); | |
52a7f16d TZ |
1080 | } |
1081 | ||
1082 | static int hist_show(struct seq_file *m, void *v) | |
1083 | { | |
1084 | struct event_trigger_data *data; | |
1085 | struct trace_event_file *event_file; | |
1086 | int n = 0, ret = 0; | |
1087 | ||
1088 | mutex_lock(&event_mutex); | |
1089 | ||
1090 | event_file = event_file_data(m->private); | |
1091 | if (unlikely(!event_file)) { | |
1092 | ret = -ENODEV; | |
1093 | goto out_unlock; | |
1094 | } | |
1095 | ||
1096 | list_for_each_entry_rcu(data, &event_file->triggers, list) { | |
1097 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) | |
1098 | hist_trigger_show(m, data, n++); | |
1099 | } | |
1100 | ||
7ef224d1 TZ |
1101 | out_unlock: |
1102 | mutex_unlock(&event_mutex); | |
1103 | ||
1104 | return ret; | |
1105 | } | |
1106 | ||
1107 | static int event_hist_open(struct inode *inode, struct file *file) | |
1108 | { | |
1109 | return single_open(file, hist_show, file); | |
1110 | } | |
1111 | ||
1112 | const struct file_operations event_hist_fops = { | |
1113 | .open = event_hist_open, | |
1114 | .read = seq_read, | |
1115 | .llseek = seq_lseek, | |
1116 | .release = single_release, | |
1117 | }; | |
1118 | ||
0c4a6b46 TZ |
1119 | static const char *get_hist_field_flags(struct hist_field *hist_field) |
1120 | { | |
1121 | const char *flags_str = NULL; | |
1122 | ||
1123 | if (hist_field->flags & HIST_FIELD_FL_HEX) | |
1124 | flags_str = "hex"; | |
c6afad49 TZ |
1125 | else if (hist_field->flags & HIST_FIELD_FL_SYM) |
1126 | flags_str = "sym"; | |
1127 | else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) | |
1128 | flags_str = "sym-offset"; | |
6b4827ad TZ |
1129 | else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) |
1130 | flags_str = "execname"; | |
31696198 TZ |
1131 | else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) |
1132 | flags_str = "syscall"; | |
4b94f5b7 NK |
1133 | else if (hist_field->flags & HIST_FIELD_FL_LOG2) |
1134 | flags_str = "log2"; | |
0c4a6b46 TZ |
1135 | |
1136 | return flags_str; | |
1137 | } | |
1138 | ||
7ef224d1 TZ |
1139 | static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) |
1140 | { | |
1141 | seq_printf(m, "%s", hist_field->field->name); | |
0c4a6b46 TZ |
1142 | if (hist_field->flags) { |
1143 | const char *flags_str = get_hist_field_flags(hist_field); | |
1144 | ||
1145 | if (flags_str) | |
1146 | seq_printf(m, ".%s", flags_str); | |
1147 | } | |
7ef224d1 TZ |
1148 | } |
1149 | ||
1150 | static int event_hist_trigger_print(struct seq_file *m, | |
1151 | struct event_trigger_ops *ops, | |
1152 | struct event_trigger_data *data) | |
1153 | { | |
1154 | struct hist_trigger_data *hist_data = data->private_data; | |
1155 | struct hist_field *key_field; | |
1156 | unsigned int i; | |
1157 | ||
5463bfda TZ |
1158 | seq_puts(m, "hist:"); |
1159 | ||
1160 | if (data->name) | |
1161 | seq_printf(m, "%s:", data->name); | |
1162 | ||
1163 | seq_puts(m, "keys="); | |
7ef224d1 TZ |
1164 | |
1165 | for_each_hist_key_field(i, hist_data) { | |
1166 | key_field = hist_data->fields[i]; | |
1167 | ||
1168 | if (i > hist_data->n_vals) | |
1169 | seq_puts(m, ","); | |
1170 | ||
69a0200c TZ |
1171 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) |
1172 | seq_puts(m, "stacktrace"); | |
1173 | else | |
1174 | hist_field_print(m, key_field); | |
7ef224d1 TZ |
1175 | } |
1176 | ||
1177 | seq_puts(m, ":vals="); | |
f2606835 TZ |
1178 | |
1179 | for_each_hist_val_field(i, hist_data) { | |
1180 | if (i == HITCOUNT_IDX) | |
1181 | seq_puts(m, "hitcount"); | |
1182 | else { | |
1183 | seq_puts(m, ","); | |
1184 | hist_field_print(m, hist_data->fields[i]); | |
1185 | } | |
1186 | } | |
7ef224d1 TZ |
1187 | |
1188 | seq_puts(m, ":sort="); | |
e62347d2 TZ |
1189 | |
1190 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
1191 | struct tracing_map_sort_key *sort_key; | |
1192 | ||
1193 | sort_key = &hist_data->sort_keys[i]; | |
1194 | ||
1195 | if (i > 0) | |
1196 | seq_puts(m, ","); | |
1197 | ||
1198 | if (sort_key->field_idx == HITCOUNT_IDX) | |
1199 | seq_puts(m, "hitcount"); | |
1200 | else { | |
1201 | unsigned int idx = sort_key->field_idx; | |
1202 | ||
1203 | if (WARN_ON(idx >= TRACING_MAP_FIELDS_MAX)) | |
1204 | return -EINVAL; | |
1205 | ||
1206 | hist_field_print(m, hist_data->fields[idx]); | |
1207 | } | |
1208 | ||
1209 | if (sort_key->descending) | |
1210 | seq_puts(m, ".descending"); | |
1211 | } | |
7ef224d1 TZ |
1212 | |
1213 | seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); | |
1214 | ||
1215 | if (data->filter_str) | |
1216 | seq_printf(m, " if %s", data->filter_str); | |
1217 | ||
83e99914 TZ |
1218 | if (data->paused) |
1219 | seq_puts(m, " [paused]"); | |
1220 | else | |
1221 | seq_puts(m, " [active]"); | |
7ef224d1 TZ |
1222 | |
1223 | seq_putc(m, '\n'); | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
5463bfda TZ |
1228 | static int event_hist_trigger_init(struct event_trigger_ops *ops, |
1229 | struct event_trigger_data *data) | |
1230 | { | |
1231 | struct hist_trigger_data *hist_data = data->private_data; | |
1232 | ||
1233 | if (!data->ref && hist_data->attrs->name) | |
1234 | save_named_trigger(hist_data->attrs->name, data); | |
1235 | ||
1236 | data->ref++; | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
7ef224d1 TZ |
1241 | static void event_hist_trigger_free(struct event_trigger_ops *ops, |
1242 | struct event_trigger_data *data) | |
1243 | { | |
1244 | struct hist_trigger_data *hist_data = data->private_data; | |
1245 | ||
1246 | if (WARN_ON_ONCE(data->ref <= 0)) | |
1247 | return; | |
1248 | ||
1249 | data->ref--; | |
1250 | if (!data->ref) { | |
5463bfda TZ |
1251 | if (data->name) |
1252 | del_named_trigger(data); | |
7ef224d1 TZ |
1253 | trigger_data_free(data); |
1254 | destroy_hist_data(hist_data); | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | static struct event_trigger_ops event_hist_trigger_ops = { | |
1259 | .func = event_hist_trigger, | |
1260 | .print = event_hist_trigger_print, | |
5463bfda | 1261 | .init = event_hist_trigger_init, |
7ef224d1 TZ |
1262 | .free = event_hist_trigger_free, |
1263 | }; | |
1264 | ||
5463bfda TZ |
1265 | static int event_hist_trigger_named_init(struct event_trigger_ops *ops, |
1266 | struct event_trigger_data *data) | |
1267 | { | |
1268 | data->ref++; | |
1269 | ||
1270 | save_named_trigger(data->named_data->name, data); | |
1271 | ||
1272 | event_hist_trigger_init(ops, data->named_data); | |
1273 | ||
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | static void event_hist_trigger_named_free(struct event_trigger_ops *ops, | |
1278 | struct event_trigger_data *data) | |
1279 | { | |
1280 | if (WARN_ON_ONCE(data->ref <= 0)) | |
1281 | return; | |
1282 | ||
1283 | event_hist_trigger_free(ops, data->named_data); | |
1284 | ||
1285 | data->ref--; | |
1286 | if (!data->ref) { | |
1287 | del_named_trigger(data); | |
1288 | trigger_data_free(data); | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | static struct event_trigger_ops event_hist_trigger_named_ops = { | |
1293 | .func = event_hist_trigger, | |
1294 | .print = event_hist_trigger_print, | |
1295 | .init = event_hist_trigger_named_init, | |
1296 | .free = event_hist_trigger_named_free, | |
1297 | }; | |
1298 | ||
7ef224d1 TZ |
1299 | static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, |
1300 | char *param) | |
1301 | { | |
1302 | return &event_hist_trigger_ops; | |
1303 | } | |
1304 | ||
e86ae9ba TZ |
1305 | static void hist_clear(struct event_trigger_data *data) |
1306 | { | |
1307 | struct hist_trigger_data *hist_data = data->private_data; | |
e86ae9ba | 1308 | |
5463bfda TZ |
1309 | if (data->name) |
1310 | pause_named_trigger(data); | |
e86ae9ba TZ |
1311 | |
1312 | synchronize_sched(); | |
1313 | ||
1314 | tracing_map_clear(hist_data->map); | |
1315 | ||
5463bfda TZ |
1316 | if (data->name) |
1317 | unpause_named_trigger(data); | |
1318 | } | |
1319 | ||
1320 | static bool compatible_field(struct ftrace_event_field *field, | |
1321 | struct ftrace_event_field *test_field) | |
1322 | { | |
1323 | if (field == test_field) | |
1324 | return true; | |
1325 | if (field == NULL || test_field == NULL) | |
1326 | return false; | |
1327 | if (strcmp(field->name, test_field->name) != 0) | |
1328 | return false; | |
1329 | if (strcmp(field->type, test_field->type) != 0) | |
1330 | return false; | |
1331 | if (field->size != test_field->size) | |
1332 | return false; | |
1333 | if (field->is_signed != test_field->is_signed) | |
1334 | return false; | |
1335 | ||
1336 | return true; | |
e86ae9ba TZ |
1337 | } |
1338 | ||
52a7f16d | 1339 | static bool hist_trigger_match(struct event_trigger_data *data, |
5463bfda TZ |
1340 | struct event_trigger_data *data_test, |
1341 | struct event_trigger_data *named_data, | |
1342 | bool ignore_filter) | |
52a7f16d TZ |
1343 | { |
1344 | struct tracing_map_sort_key *sort_key, *sort_key_test; | |
1345 | struct hist_trigger_data *hist_data, *hist_data_test; | |
1346 | struct hist_field *key_field, *key_field_test; | |
1347 | unsigned int i; | |
1348 | ||
5463bfda TZ |
1349 | if (named_data && (named_data != data_test) && |
1350 | (named_data != data_test->named_data)) | |
1351 | return false; | |
1352 | ||
1353 | if (!named_data && is_named_trigger(data_test)) | |
1354 | return false; | |
1355 | ||
52a7f16d TZ |
1356 | hist_data = data->private_data; |
1357 | hist_data_test = data_test->private_data; | |
1358 | ||
1359 | if (hist_data->n_vals != hist_data_test->n_vals || | |
1360 | hist_data->n_fields != hist_data_test->n_fields || | |
1361 | hist_data->n_sort_keys != hist_data_test->n_sort_keys) | |
1362 | return false; | |
1363 | ||
5463bfda TZ |
1364 | if (!ignore_filter) { |
1365 | if ((data->filter_str && !data_test->filter_str) || | |
1366 | (!data->filter_str && data_test->filter_str)) | |
1367 | return false; | |
1368 | } | |
52a7f16d TZ |
1369 | |
1370 | for_each_hist_field(i, hist_data) { | |
1371 | key_field = hist_data->fields[i]; | |
1372 | key_field_test = hist_data_test->fields[i]; | |
1373 | ||
1374 | if (key_field->flags != key_field_test->flags) | |
1375 | return false; | |
5463bfda | 1376 | if (!compatible_field(key_field->field, key_field_test->field)) |
52a7f16d TZ |
1377 | return false; |
1378 | if (key_field->offset != key_field_test->offset) | |
1379 | return false; | |
1380 | } | |
1381 | ||
1382 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
1383 | sort_key = &hist_data->sort_keys[i]; | |
1384 | sort_key_test = &hist_data_test->sort_keys[i]; | |
1385 | ||
1386 | if (sort_key->field_idx != sort_key_test->field_idx || | |
1387 | sort_key->descending != sort_key_test->descending) | |
1388 | return false; | |
1389 | } | |
1390 | ||
5463bfda | 1391 | if (!ignore_filter && data->filter_str && |
52a7f16d TZ |
1392 | (strcmp(data->filter_str, data_test->filter_str) != 0)) |
1393 | return false; | |
1394 | ||
1395 | return true; | |
1396 | } | |
1397 | ||
7ef224d1 TZ |
1398 | static int hist_register_trigger(char *glob, struct event_trigger_ops *ops, |
1399 | struct event_trigger_data *data, | |
1400 | struct trace_event_file *file) | |
1401 | { | |
83e99914 | 1402 | struct hist_trigger_data *hist_data = data->private_data; |
5463bfda | 1403 | struct event_trigger_data *test, *named_data = NULL; |
7ef224d1 TZ |
1404 | int ret = 0; |
1405 | ||
5463bfda TZ |
1406 | if (hist_data->attrs->name) { |
1407 | named_data = find_named_trigger(hist_data->attrs->name); | |
1408 | if (named_data) { | |
1409 | if (!hist_trigger_match(data, named_data, named_data, | |
1410 | true)) { | |
1411 | ret = -EINVAL; | |
1412 | goto out; | |
1413 | } | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | if (hist_data->attrs->name && !named_data) | |
1418 | goto new; | |
1419 | ||
7ef224d1 TZ |
1420 | list_for_each_entry_rcu(test, &file->triggers, list) { |
1421 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 1422 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d | 1423 | continue; |
83e99914 TZ |
1424 | if (hist_data->attrs->pause) |
1425 | test->paused = true; | |
1426 | else if (hist_data->attrs->cont) | |
1427 | test->paused = false; | |
e86ae9ba TZ |
1428 | else if (hist_data->attrs->clear) |
1429 | hist_clear(test); | |
83e99914 TZ |
1430 | else |
1431 | ret = -EEXIST; | |
7ef224d1 TZ |
1432 | goto out; |
1433 | } | |
1434 | } | |
5463bfda | 1435 | new: |
e86ae9ba | 1436 | if (hist_data->attrs->cont || hist_data->attrs->clear) { |
83e99914 TZ |
1437 | ret = -ENOENT; |
1438 | goto out; | |
1439 | } | |
1440 | ||
5463bfda TZ |
1441 | if (named_data) { |
1442 | destroy_hist_data(data->private_data); | |
1443 | data->private_data = named_data->private_data; | |
1444 | set_named_trigger_data(data, named_data); | |
1445 | data->ops = &event_hist_trigger_named_ops; | |
1446 | } | |
1447 | ||
83e99914 TZ |
1448 | if (hist_data->attrs->pause) |
1449 | data->paused = true; | |
1450 | ||
7ef224d1 TZ |
1451 | if (data->ops->init) { |
1452 | ret = data->ops->init(data->ops, data); | |
1453 | if (ret < 0) | |
1454 | goto out; | |
1455 | } | |
1456 | ||
1457 | list_add_rcu(&data->list, &file->triggers); | |
1458 | ret++; | |
1459 | ||
1460 | update_cond_flag(file); | |
5463bfda | 1461 | |
7ef224d1 TZ |
1462 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
1463 | list_del_rcu(&data->list); | |
1464 | update_cond_flag(file); | |
1465 | ret--; | |
1466 | } | |
1467 | out: | |
1468 | return ret; | |
1469 | } | |
1470 | ||
52a7f16d TZ |
1471 | static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops, |
1472 | struct event_trigger_data *data, | |
1473 | struct trace_event_file *file) | |
1474 | { | |
5463bfda TZ |
1475 | struct hist_trigger_data *hist_data = data->private_data; |
1476 | struct event_trigger_data *test, *named_data = NULL; | |
52a7f16d TZ |
1477 | bool unregistered = false; |
1478 | ||
5463bfda TZ |
1479 | if (hist_data->attrs->name) |
1480 | named_data = find_named_trigger(hist_data->attrs->name); | |
1481 | ||
52a7f16d TZ |
1482 | list_for_each_entry_rcu(test, &file->triggers, list) { |
1483 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 1484 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d TZ |
1485 | continue; |
1486 | unregistered = true; | |
1487 | list_del_rcu(&test->list); | |
1488 | trace_event_trigger_enable_disable(file, 0); | |
1489 | update_cond_flag(file); | |
1490 | break; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | if (unregistered && test->ops->free) | |
1495 | test->ops->free(test->ops, test); | |
1496 | } | |
1497 | ||
1498 | static void hist_unreg_all(struct trace_event_file *file) | |
1499 | { | |
1500 | struct event_trigger_data *test; | |
1501 | ||
1502 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
1503 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
1504 | list_del_rcu(&test->list); | |
1505 | trace_event_trigger_enable_disable(file, 0); | |
1506 | update_cond_flag(file); | |
1507 | if (test->ops->free) | |
1508 | test->ops->free(test->ops, test); | |
1509 | } | |
1510 | } | |
1511 | } | |
1512 | ||
7ef224d1 TZ |
1513 | static int event_hist_trigger_func(struct event_command *cmd_ops, |
1514 | struct trace_event_file *file, | |
1515 | char *glob, char *cmd, char *param) | |
1516 | { | |
1517 | unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; | |
1518 | struct event_trigger_data *trigger_data; | |
1519 | struct hist_trigger_attrs *attrs; | |
1520 | struct event_trigger_ops *trigger_ops; | |
1521 | struct hist_trigger_data *hist_data; | |
1522 | char *trigger; | |
1523 | int ret = 0; | |
1524 | ||
1525 | if (!param) | |
1526 | return -EINVAL; | |
1527 | ||
1528 | /* separate the trigger from the filter (k:v [if filter]) */ | |
1529 | trigger = strsep(¶m, " \t"); | |
1530 | if (!trigger) | |
1531 | return -EINVAL; | |
1532 | ||
1533 | attrs = parse_hist_trigger_attrs(trigger); | |
1534 | if (IS_ERR(attrs)) | |
1535 | return PTR_ERR(attrs); | |
1536 | ||
1537 | if (attrs->map_bits) | |
1538 | hist_trigger_bits = attrs->map_bits; | |
1539 | ||
1540 | hist_data = create_hist_data(hist_trigger_bits, attrs, file); | |
1541 | if (IS_ERR(hist_data)) { | |
1542 | destroy_hist_trigger_attrs(attrs); | |
1543 | return PTR_ERR(hist_data); | |
1544 | } | |
1545 | ||
1546 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); | |
1547 | ||
1548 | ret = -ENOMEM; | |
1549 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); | |
1550 | if (!trigger_data) | |
1551 | goto out_free; | |
1552 | ||
1553 | trigger_data->count = -1; | |
1554 | trigger_data->ops = trigger_ops; | |
1555 | trigger_data->cmd_ops = cmd_ops; | |
1556 | ||
1557 | INIT_LIST_HEAD(&trigger_data->list); | |
1558 | RCU_INIT_POINTER(trigger_data->filter, NULL); | |
1559 | ||
1560 | trigger_data->private_data = hist_data; | |
1561 | ||
52a7f16d TZ |
1562 | /* if param is non-empty, it's supposed to be a filter */ |
1563 | if (param && cmd_ops->set_filter) { | |
1564 | ret = cmd_ops->set_filter(param, trigger_data, file); | |
1565 | if (ret < 0) | |
1566 | goto out_free; | |
1567 | } | |
1568 | ||
7ef224d1 TZ |
1569 | if (glob[0] == '!') { |
1570 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); | |
1571 | ret = 0; | |
1572 | goto out_free; | |
1573 | } | |
1574 | ||
7ef224d1 TZ |
1575 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
1576 | /* | |
1577 | * The above returns on success the # of triggers registered, | |
1578 | * but if it didn't register any it returns zero. Consider no | |
1579 | * triggers registered a failure too. | |
1580 | */ | |
1581 | if (!ret) { | |
e86ae9ba | 1582 | if (!(attrs->pause || attrs->cont || attrs->clear)) |
83e99914 | 1583 | ret = -ENOENT; |
7ef224d1 TZ |
1584 | goto out_free; |
1585 | } else if (ret < 0) | |
1586 | goto out_free; | |
1587 | /* Just return zero, not the number of registered triggers */ | |
1588 | ret = 0; | |
1589 | out: | |
1590 | return ret; | |
1591 | out_free: | |
1592 | if (cmd_ops->set_filter) | |
1593 | cmd_ops->set_filter(NULL, trigger_data, NULL); | |
1594 | ||
1595 | kfree(trigger_data); | |
1596 | ||
1597 | destroy_hist_data(hist_data); | |
1598 | goto out; | |
1599 | } | |
1600 | ||
1601 | static struct event_command trigger_hist_cmd = { | |
1602 | .name = "hist", | |
1603 | .trigger_type = ETT_EVENT_HIST, | |
1604 | .flags = EVENT_CMD_FL_NEEDS_REC, | |
1605 | .func = event_hist_trigger_func, | |
1606 | .reg = hist_register_trigger, | |
52a7f16d TZ |
1607 | .unreg = hist_unregister_trigger, |
1608 | .unreg_all = hist_unreg_all, | |
7ef224d1 TZ |
1609 | .get_trigger_ops = event_hist_get_trigger_ops, |
1610 | .set_filter = set_trigger_filter, | |
1611 | }; | |
1612 | ||
1613 | __init int register_trigger_hist_cmd(void) | |
1614 | { | |
1615 | int ret; | |
1616 | ||
1617 | ret = register_event_command(&trigger_hist_cmd); | |
1618 | WARN_ON(ret < 0); | |
1619 | ||
1620 | return ret; | |
1621 | } | |
d0bad49b TZ |
1622 | |
1623 | static void | |
1624 | hist_enable_trigger(struct event_trigger_data *data, void *rec) | |
1625 | { | |
1626 | struct enable_trigger_data *enable_data = data->private_data; | |
1627 | struct event_trigger_data *test; | |
1628 | ||
1629 | list_for_each_entry_rcu(test, &enable_data->file->triggers, list) { | |
1630 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
1631 | if (enable_data->enable) | |
1632 | test->paused = false; | |
1633 | else | |
1634 | test->paused = true; | |
d0bad49b TZ |
1635 | } |
1636 | } | |
1637 | } | |
1638 | ||
1639 | static void | |
1640 | hist_enable_count_trigger(struct event_trigger_data *data, void *rec) | |
1641 | { | |
1642 | if (!data->count) | |
1643 | return; | |
1644 | ||
1645 | if (data->count != -1) | |
1646 | (data->count)--; | |
1647 | ||
1648 | hist_enable_trigger(data, rec); | |
1649 | } | |
1650 | ||
1651 | static struct event_trigger_ops hist_enable_trigger_ops = { | |
1652 | .func = hist_enable_trigger, | |
1653 | .print = event_enable_trigger_print, | |
1654 | .init = event_trigger_init, | |
1655 | .free = event_enable_trigger_free, | |
1656 | }; | |
1657 | ||
1658 | static struct event_trigger_ops hist_enable_count_trigger_ops = { | |
1659 | .func = hist_enable_count_trigger, | |
1660 | .print = event_enable_trigger_print, | |
1661 | .init = event_trigger_init, | |
1662 | .free = event_enable_trigger_free, | |
1663 | }; | |
1664 | ||
1665 | static struct event_trigger_ops hist_disable_trigger_ops = { | |
1666 | .func = hist_enable_trigger, | |
1667 | .print = event_enable_trigger_print, | |
1668 | .init = event_trigger_init, | |
1669 | .free = event_enable_trigger_free, | |
1670 | }; | |
1671 | ||
1672 | static struct event_trigger_ops hist_disable_count_trigger_ops = { | |
1673 | .func = hist_enable_count_trigger, | |
1674 | .print = event_enable_trigger_print, | |
1675 | .init = event_trigger_init, | |
1676 | .free = event_enable_trigger_free, | |
1677 | }; | |
1678 | ||
1679 | static struct event_trigger_ops * | |
1680 | hist_enable_get_trigger_ops(char *cmd, char *param) | |
1681 | { | |
1682 | struct event_trigger_ops *ops; | |
1683 | bool enable; | |
1684 | ||
1685 | enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); | |
1686 | ||
1687 | if (enable) | |
1688 | ops = param ? &hist_enable_count_trigger_ops : | |
1689 | &hist_enable_trigger_ops; | |
1690 | else | |
1691 | ops = param ? &hist_disable_count_trigger_ops : | |
1692 | &hist_disable_trigger_ops; | |
1693 | ||
1694 | return ops; | |
1695 | } | |
1696 | ||
52a7f16d TZ |
1697 | static void hist_enable_unreg_all(struct trace_event_file *file) |
1698 | { | |
1699 | struct event_trigger_data *test; | |
1700 | ||
1701 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
1702 | if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { | |
1703 | list_del_rcu(&test->list); | |
1704 | update_cond_flag(file); | |
1705 | trace_event_trigger_enable_disable(file, 0); | |
1706 | if (test->ops->free) | |
1707 | test->ops->free(test->ops, test); | |
1708 | } | |
1709 | } | |
1710 | } | |
1711 | ||
d0bad49b TZ |
1712 | static struct event_command trigger_hist_enable_cmd = { |
1713 | .name = ENABLE_HIST_STR, | |
1714 | .trigger_type = ETT_HIST_ENABLE, | |
1715 | .func = event_enable_trigger_func, | |
1716 | .reg = event_enable_register_trigger, | |
1717 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 1718 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
1719 | .get_trigger_ops = hist_enable_get_trigger_ops, |
1720 | .set_filter = set_trigger_filter, | |
1721 | }; | |
1722 | ||
1723 | static struct event_command trigger_hist_disable_cmd = { | |
1724 | .name = DISABLE_HIST_STR, | |
1725 | .trigger_type = ETT_HIST_ENABLE, | |
1726 | .func = event_enable_trigger_func, | |
1727 | .reg = event_enable_register_trigger, | |
1728 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 1729 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
1730 | .get_trigger_ops = hist_enable_get_trigger_ops, |
1731 | .set_filter = set_trigger_filter, | |
1732 | }; | |
1733 | ||
1734 | static __init void unregister_trigger_hist_enable_disable_cmds(void) | |
1735 | { | |
1736 | unregister_event_command(&trigger_hist_enable_cmd); | |
1737 | unregister_event_command(&trigger_hist_disable_cmd); | |
1738 | } | |
1739 | ||
1740 | __init int register_trigger_hist_enable_disable_cmds(void) | |
1741 | { | |
1742 | int ret; | |
1743 | ||
1744 | ret = register_event_command(&trigger_hist_enable_cmd); | |
1745 | if (WARN_ON(ret < 0)) | |
1746 | return ret; | |
1747 | ret = register_event_command(&trigger_hist_disable_cmd); | |
1748 | if (WARN_ON(ret < 0)) | |
1749 | unregister_trigger_hist_enable_disable_cmds(); | |
1750 | ||
1751 | return ret; | |
1752 | } |