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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> | |
b2d09103 | 22 | #include <linux/rculist.h> |
4b147936 | 23 | #include <linux/tracefs.h> |
7ef224d1 TZ |
24 | |
25 | #include "tracing_map.h" | |
26 | #include "trace.h" | |
27 | ||
4b147936 TZ |
28 | #define SYNTH_SYSTEM "synthetic" |
29 | #define SYNTH_FIELDS_MAX 16 | |
30 | ||
31 | #define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */ | |
32 | ||
7ef224d1 TZ |
33 | struct hist_field; |
34 | ||
df35d93b TZ |
35 | typedef u64 (*hist_field_fn_t) (struct hist_field *field, |
36 | struct tracing_map_elt *elt, | |
37 | struct ring_buffer_event *rbe, | |
38 | void *event); | |
7ef224d1 | 39 | |
5819eadd | 40 | #define HIST_FIELD_OPERANDS_MAX 2 |
30350d65 | 41 | #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) |
0212e2aa | 42 | #define HIST_ACTIONS_MAX 8 |
30350d65 | 43 | |
100719dc TZ |
44 | enum field_op_id { |
45 | FIELD_OP_NONE, | |
46 | FIELD_OP_PLUS, | |
47 | FIELD_OP_MINUS, | |
48 | FIELD_OP_UNARY_MINUS, | |
49 | }; | |
50 | ||
30350d65 TZ |
51 | struct hist_var { |
52 | char *name; | |
53 | struct hist_trigger_data *hist_data; | |
54 | unsigned int idx; | |
55 | }; | |
5819eadd | 56 | |
7ef224d1 TZ |
57 | struct hist_field { |
58 | struct ftrace_event_field *field; | |
59 | unsigned long flags; | |
60 | hist_field_fn_t fn; | |
61 | unsigned int size; | |
76a3b0c8 | 62 | unsigned int offset; |
5819eadd | 63 | unsigned int is_signed; |
19a9facd | 64 | const char *type; |
5819eadd | 65 | struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; |
b559d003 | 66 | struct hist_trigger_data *hist_data; |
30350d65 | 67 | struct hist_var var; |
100719dc | 68 | enum field_op_id operator; |
067fe038 TZ |
69 | char *system; |
70 | char *event_name; | |
100719dc | 71 | char *name; |
067fe038 TZ |
72 | unsigned int var_idx; |
73 | unsigned int var_ref_idx; | |
74 | bool read_once; | |
7ef224d1 TZ |
75 | }; |
76 | ||
df35d93b TZ |
77 | static u64 hist_field_none(struct hist_field *field, |
78 | struct tracing_map_elt *elt, | |
79 | struct ring_buffer_event *rbe, | |
80 | void *event) | |
69a0200c TZ |
81 | { |
82 | return 0; | |
83 | } | |
84 | ||
df35d93b TZ |
85 | static u64 hist_field_counter(struct hist_field *field, |
86 | struct tracing_map_elt *elt, | |
87 | struct ring_buffer_event *rbe, | |
88 | void *event) | |
7ef224d1 TZ |
89 | { |
90 | return 1; | |
91 | } | |
92 | ||
df35d93b TZ |
93 | static u64 hist_field_string(struct hist_field *hist_field, |
94 | struct tracing_map_elt *elt, | |
95 | struct ring_buffer_event *rbe, | |
96 | void *event) | |
7ef224d1 TZ |
97 | { |
98 | char *addr = (char *)(event + hist_field->field->offset); | |
99 | ||
100 | return (u64)(unsigned long)addr; | |
101 | } | |
102 | ||
df35d93b TZ |
103 | static u64 hist_field_dynstring(struct hist_field *hist_field, |
104 | struct tracing_map_elt *elt, | |
105 | struct ring_buffer_event *rbe, | |
106 | void *event) | |
79e577cb NK |
107 | { |
108 | u32 str_item = *(u32 *)(event + hist_field->field->offset); | |
109 | int str_loc = str_item & 0xffff; | |
110 | char *addr = (char *)(event + str_loc); | |
111 | ||
112 | return (u64)(unsigned long)addr; | |
113 | } | |
114 | ||
df35d93b TZ |
115 | static u64 hist_field_pstring(struct hist_field *hist_field, |
116 | struct tracing_map_elt *elt, | |
117 | struct ring_buffer_event *rbe, | |
118 | void *event) | |
79e577cb NK |
119 | { |
120 | char **addr = (char **)(event + hist_field->field->offset); | |
121 | ||
122 | return (u64)(unsigned long)*addr; | |
123 | } | |
124 | ||
df35d93b TZ |
125 | static u64 hist_field_log2(struct hist_field *hist_field, |
126 | struct tracing_map_elt *elt, | |
127 | struct ring_buffer_event *rbe, | |
128 | void *event) | |
4b94f5b7 | 129 | { |
5819eadd TZ |
130 | struct hist_field *operand = hist_field->operands[0]; |
131 | ||
df35d93b | 132 | u64 val = operand->fn(operand, elt, rbe, event); |
4b94f5b7 NK |
133 | |
134 | return (u64) ilog2(roundup_pow_of_two(val)); | |
135 | } | |
136 | ||
df35d93b TZ |
137 | static u64 hist_field_plus(struct hist_field *hist_field, |
138 | struct tracing_map_elt *elt, | |
139 | struct ring_buffer_event *rbe, | |
140 | void *event) | |
100719dc TZ |
141 | { |
142 | struct hist_field *operand1 = hist_field->operands[0]; | |
143 | struct hist_field *operand2 = hist_field->operands[1]; | |
144 | ||
df35d93b TZ |
145 | u64 val1 = operand1->fn(operand1, elt, rbe, event); |
146 | u64 val2 = operand2->fn(operand2, elt, rbe, event); | |
100719dc TZ |
147 | |
148 | return val1 + val2; | |
149 | } | |
150 | ||
df35d93b TZ |
151 | static u64 hist_field_minus(struct hist_field *hist_field, |
152 | struct tracing_map_elt *elt, | |
153 | struct ring_buffer_event *rbe, | |
154 | void *event) | |
100719dc TZ |
155 | { |
156 | struct hist_field *operand1 = hist_field->operands[0]; | |
157 | struct hist_field *operand2 = hist_field->operands[1]; | |
158 | ||
df35d93b TZ |
159 | u64 val1 = operand1->fn(operand1, elt, rbe, event); |
160 | u64 val2 = operand2->fn(operand2, elt, rbe, event); | |
100719dc TZ |
161 | |
162 | return val1 - val2; | |
163 | } | |
164 | ||
df35d93b TZ |
165 | static u64 hist_field_unary_minus(struct hist_field *hist_field, |
166 | struct tracing_map_elt *elt, | |
167 | struct ring_buffer_event *rbe, | |
168 | void *event) | |
100719dc TZ |
169 | { |
170 | struct hist_field *operand = hist_field->operands[0]; | |
171 | ||
df35d93b | 172 | s64 sval = (s64)operand->fn(operand, elt, rbe, event); |
100719dc TZ |
173 | u64 val = (u64)-sval; |
174 | ||
175 | return val; | |
176 | } | |
177 | ||
7ef224d1 | 178 | #define DEFINE_HIST_FIELD_FN(type) \ |
fbd302cb | 179 | static u64 hist_field_##type(struct hist_field *hist_field, \ |
df35d93b TZ |
180 | struct tracing_map_elt *elt, \ |
181 | struct ring_buffer_event *rbe, \ | |
182 | void *event) \ | |
7ef224d1 TZ |
183 | { \ |
184 | type *addr = (type *)(event + hist_field->field->offset); \ | |
185 | \ | |
79e577cb | 186 | return (u64)(unsigned long)*addr; \ |
7ef224d1 TZ |
187 | } |
188 | ||
189 | DEFINE_HIST_FIELD_FN(s64); | |
190 | DEFINE_HIST_FIELD_FN(u64); | |
191 | DEFINE_HIST_FIELD_FN(s32); | |
192 | DEFINE_HIST_FIELD_FN(u32); | |
193 | DEFINE_HIST_FIELD_FN(s16); | |
194 | DEFINE_HIST_FIELD_FN(u16); | |
195 | DEFINE_HIST_FIELD_FN(s8); | |
196 | DEFINE_HIST_FIELD_FN(u8); | |
197 | ||
198 | #define for_each_hist_field(i, hist_data) \ | |
199 | for ((i) = 0; (i) < (hist_data)->n_fields; (i)++) | |
200 | ||
201 | #define for_each_hist_val_field(i, hist_data) \ | |
202 | for ((i) = 0; (i) < (hist_data)->n_vals; (i)++) | |
203 | ||
204 | #define for_each_hist_key_field(i, hist_data) \ | |
205 | for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++) | |
206 | ||
69a0200c TZ |
207 | #define HIST_STACKTRACE_DEPTH 16 |
208 | #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) | |
209 | #define HIST_STACKTRACE_SKIP 5 | |
210 | ||
7ef224d1 | 211 | #define HITCOUNT_IDX 0 |
69a0200c | 212 | #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) |
7ef224d1 TZ |
213 | |
214 | enum hist_field_flags { | |
0d7a8325 TZ |
215 | HIST_FIELD_FL_HITCOUNT = 1 << 0, |
216 | HIST_FIELD_FL_KEY = 1 << 1, | |
217 | HIST_FIELD_FL_STRING = 1 << 2, | |
218 | HIST_FIELD_FL_HEX = 1 << 3, | |
219 | HIST_FIELD_FL_SYM = 1 << 4, | |
220 | HIST_FIELD_FL_SYM_OFFSET = 1 << 5, | |
221 | HIST_FIELD_FL_EXECNAME = 1 << 6, | |
222 | HIST_FIELD_FL_SYSCALL = 1 << 7, | |
223 | HIST_FIELD_FL_STACKTRACE = 1 << 8, | |
224 | HIST_FIELD_FL_LOG2 = 1 << 9, | |
ad42febe | 225 | HIST_FIELD_FL_TIMESTAMP = 1 << 10, |
860f9f6b | 226 | HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, |
30350d65 | 227 | HIST_FIELD_FL_VAR = 1 << 12, |
100719dc | 228 | HIST_FIELD_FL_EXPR = 1 << 13, |
067fe038 | 229 | HIST_FIELD_FL_VAR_REF = 1 << 14, |
8b7622bf | 230 | HIST_FIELD_FL_CPU = 1 << 15, |
7e8b88a3 | 231 | HIST_FIELD_FL_ALIAS = 1 << 16, |
30350d65 TZ |
232 | }; |
233 | ||
234 | struct var_defs { | |
235 | unsigned int n_vars; | |
236 | char *name[TRACING_MAP_VARS_MAX]; | |
237 | char *expr[TRACING_MAP_VARS_MAX]; | |
7ef224d1 TZ |
238 | }; |
239 | ||
240 | struct hist_trigger_attrs { | |
241 | char *keys_str; | |
f2606835 | 242 | char *vals_str; |
e62347d2 | 243 | char *sort_key_str; |
5463bfda | 244 | char *name; |
a4072fe8 | 245 | char *clock; |
83e99914 TZ |
246 | bool pause; |
247 | bool cont; | |
e86ae9ba | 248 | bool clear; |
860f9f6b | 249 | bool ts_in_usecs; |
7ef224d1 | 250 | unsigned int map_bits; |
30350d65 TZ |
251 | |
252 | char *assignment_str[TRACING_MAP_VARS_MAX]; | |
253 | unsigned int n_assignments; | |
254 | ||
0212e2aa TZ |
255 | char *action_str[HIST_ACTIONS_MAX]; |
256 | unsigned int n_actions; | |
257 | ||
30350d65 | 258 | struct var_defs var_defs; |
7ef224d1 TZ |
259 | }; |
260 | ||
02205a67 TZ |
261 | struct field_var { |
262 | struct hist_field *var; | |
263 | struct hist_field *val; | |
264 | }; | |
265 | ||
266 | struct field_var_hist { | |
267 | struct hist_trigger_data *hist_data; | |
268 | char *cmd; | |
269 | }; | |
270 | ||
7ef224d1 | 271 | struct hist_trigger_data { |
30350d65 | 272 | struct hist_field *fields[HIST_FIELDS_MAX]; |
7ef224d1 TZ |
273 | unsigned int n_vals; |
274 | unsigned int n_keys; | |
275 | unsigned int n_fields; | |
30350d65 | 276 | unsigned int n_vars; |
7ef224d1 TZ |
277 | unsigned int key_size; |
278 | struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; | |
279 | unsigned int n_sort_keys; | |
280 | struct trace_event_file *event_file; | |
281 | struct hist_trigger_attrs *attrs; | |
282 | struct tracing_map *map; | |
ad42febe | 283 | bool enable_timestamps; |
30350d65 | 284 | bool remove; |
067fe038 TZ |
285 | struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; |
286 | unsigned int n_var_refs; | |
0212e2aa TZ |
287 | |
288 | struct action_data *actions[HIST_ACTIONS_MAX]; | |
289 | unsigned int n_actions; | |
02205a67 | 290 | |
c282a386 TZ |
291 | struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX]; |
292 | unsigned int n_synth_var_refs; | |
02205a67 TZ |
293 | struct field_var *field_vars[SYNTH_FIELDS_MAX]; |
294 | unsigned int n_field_vars; | |
295 | unsigned int n_field_var_str; | |
296 | struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; | |
297 | unsigned int n_field_var_hists; | |
50450603 TZ |
298 | |
299 | struct field_var *max_vars[SYNTH_FIELDS_MAX]; | |
300 | unsigned int n_max_vars; | |
301 | unsigned int n_max_var_str; | |
0212e2aa TZ |
302 | }; |
303 | ||
4b147936 TZ |
304 | struct synth_field { |
305 | char *type; | |
306 | char *name; | |
307 | size_t size; | |
308 | bool is_signed; | |
309 | bool is_string; | |
310 | }; | |
311 | ||
312 | struct synth_event { | |
313 | struct list_head list; | |
314 | int ref; | |
315 | char *name; | |
316 | struct synth_field **fields; | |
317 | unsigned int n_fields; | |
318 | unsigned int n_u64; | |
319 | struct trace_event_class class; | |
320 | struct trace_event_call call; | |
321 | struct tracepoint *tp; | |
322 | }; | |
323 | ||
0212e2aa TZ |
324 | struct action_data; |
325 | ||
326 | typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, | |
327 | struct tracing_map_elt *elt, void *rec, | |
328 | struct ring_buffer_event *rbe, | |
329 | struct action_data *data, u64 *var_ref_vals); | |
330 | ||
331 | struct action_data { | |
332 | action_fn_t fn; | |
c282a386 TZ |
333 | unsigned int n_params; |
334 | char *params[SYNTH_FIELDS_MAX]; | |
335 | ||
336 | union { | |
337 | struct { | |
338 | unsigned int var_ref_idx; | |
339 | char *match_event; | |
340 | char *match_event_system; | |
341 | char *synth_event_name; | |
342 | struct synth_event *synth_event; | |
343 | } onmatch; | |
50450603 TZ |
344 | |
345 | struct { | |
346 | char *var_str; | |
347 | char *fn_name; | |
348 | unsigned int max_var_ref_idx; | |
349 | struct hist_field *max_var; | |
350 | struct hist_field *var; | |
351 | } onmax; | |
c282a386 | 352 | }; |
7ef224d1 TZ |
353 | }; |
354 | ||
f404da6e TZ |
355 | |
356 | static char last_hist_cmd[MAX_FILTER_STR_VAL]; | |
357 | static char hist_err_str[MAX_FILTER_STR_VAL]; | |
358 | ||
359 | static void last_cmd_set(char *str) | |
360 | { | |
361 | if (!str) | |
362 | return; | |
363 | ||
364 | strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1); | |
365 | } | |
366 | ||
367 | static void hist_err(char *str, char *var) | |
368 | { | |
369 | int maxlen = MAX_FILTER_STR_VAL - 1; | |
370 | ||
371 | if (!str) | |
372 | return; | |
373 | ||
374 | if (strlen(hist_err_str)) | |
375 | return; | |
376 | ||
377 | if (!var) | |
378 | var = ""; | |
379 | ||
380 | if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen) | |
381 | return; | |
382 | ||
383 | strcat(hist_err_str, str); | |
384 | strcat(hist_err_str, var); | |
385 | } | |
386 | ||
387 | static void hist_err_event(char *str, char *system, char *event, char *var) | |
388 | { | |
389 | char err[MAX_FILTER_STR_VAL]; | |
390 | ||
391 | if (system && var) | |
392 | snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var); | |
393 | else if (system) | |
394 | snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event); | |
395 | else | |
cf4d418e | 396 | strscpy(err, var, MAX_FILTER_STR_VAL); |
f404da6e TZ |
397 | |
398 | hist_err(str, err); | |
399 | } | |
400 | ||
401 | static void hist_err_clear(void) | |
402 | { | |
403 | hist_err_str[0] = '\0'; | |
404 | } | |
405 | ||
406 | static bool have_hist_err(void) | |
407 | { | |
408 | if (strlen(hist_err_str)) | |
409 | return true; | |
410 | ||
411 | return false; | |
412 | } | |
413 | ||
4b147936 TZ |
414 | static LIST_HEAD(synth_event_list); |
415 | static DEFINE_MUTEX(synth_event_mutex); | |
416 | ||
417 | struct synth_trace_event { | |
418 | struct trace_entry ent; | |
419 | u64 fields[]; | |
420 | }; | |
421 | ||
422 | static int synth_event_define_fields(struct trace_event_call *call) | |
423 | { | |
424 | struct synth_trace_event trace; | |
425 | int offset = offsetof(typeof(trace), fields); | |
426 | struct synth_event *event = call->data; | |
427 | unsigned int i, size, n_u64; | |
428 | char *name, *type; | |
429 | bool is_signed; | |
430 | int ret = 0; | |
431 | ||
432 | for (i = 0, n_u64 = 0; i < event->n_fields; i++) { | |
433 | size = event->fields[i]->size; | |
434 | is_signed = event->fields[i]->is_signed; | |
435 | type = event->fields[i]->type; | |
436 | name = event->fields[i]->name; | |
437 | ret = trace_define_field(call, type, name, offset, size, | |
438 | is_signed, FILTER_OTHER); | |
439 | if (ret) | |
440 | break; | |
441 | ||
442 | if (event->fields[i]->is_string) { | |
443 | offset += STR_VAR_LEN_MAX; | |
444 | n_u64 += STR_VAR_LEN_MAX / sizeof(u64); | |
445 | } else { | |
446 | offset += sizeof(u64); | |
447 | n_u64++; | |
448 | } | |
449 | } | |
450 | ||
451 | event->n_u64 = n_u64; | |
452 | ||
453 | return ret; | |
454 | } | |
455 | ||
456 | static bool synth_field_signed(char *type) | |
457 | { | |
458 | if (strncmp(type, "u", 1) == 0) | |
459 | return false; | |
460 | ||
461 | return true; | |
462 | } | |
463 | ||
464 | static int synth_field_is_string(char *type) | |
465 | { | |
466 | if (strstr(type, "char[") != NULL) | |
467 | return true; | |
468 | ||
469 | return false; | |
470 | } | |
471 | ||
472 | static int synth_field_string_size(char *type) | |
473 | { | |
474 | char buf[4], *end, *start; | |
475 | unsigned int len; | |
476 | int size, err; | |
477 | ||
478 | start = strstr(type, "char["); | |
479 | if (start == NULL) | |
480 | return -EINVAL; | |
481 | start += strlen("char["); | |
482 | ||
483 | end = strchr(type, ']'); | |
484 | if (!end || end < start) | |
485 | return -EINVAL; | |
486 | ||
487 | len = end - start; | |
488 | if (len > 3) | |
489 | return -EINVAL; | |
490 | ||
491 | strncpy(buf, start, len); | |
492 | buf[len] = '\0'; | |
493 | ||
494 | err = kstrtouint(buf, 0, &size); | |
495 | if (err) | |
496 | return err; | |
497 | ||
498 | if (size > STR_VAR_LEN_MAX) | |
499 | return -EINVAL; | |
500 | ||
501 | return size; | |
502 | } | |
503 | ||
504 | static int synth_field_size(char *type) | |
505 | { | |
506 | int size = 0; | |
507 | ||
508 | if (strcmp(type, "s64") == 0) | |
509 | size = sizeof(s64); | |
510 | else if (strcmp(type, "u64") == 0) | |
511 | size = sizeof(u64); | |
512 | else if (strcmp(type, "s32") == 0) | |
513 | size = sizeof(s32); | |
514 | else if (strcmp(type, "u32") == 0) | |
515 | size = sizeof(u32); | |
516 | else if (strcmp(type, "s16") == 0) | |
517 | size = sizeof(s16); | |
518 | else if (strcmp(type, "u16") == 0) | |
519 | size = sizeof(u16); | |
520 | else if (strcmp(type, "s8") == 0) | |
521 | size = sizeof(s8); | |
522 | else if (strcmp(type, "u8") == 0) | |
523 | size = sizeof(u8); | |
524 | else if (strcmp(type, "char") == 0) | |
525 | size = sizeof(char); | |
526 | else if (strcmp(type, "unsigned char") == 0) | |
527 | size = sizeof(unsigned char); | |
528 | else if (strcmp(type, "int") == 0) | |
529 | size = sizeof(int); | |
530 | else if (strcmp(type, "unsigned int") == 0) | |
531 | size = sizeof(unsigned int); | |
532 | else if (strcmp(type, "long") == 0) | |
533 | size = sizeof(long); | |
534 | else if (strcmp(type, "unsigned long") == 0) | |
535 | size = sizeof(unsigned long); | |
536 | else if (strcmp(type, "pid_t") == 0) | |
537 | size = sizeof(pid_t); | |
538 | else if (synth_field_is_string(type)) | |
539 | size = synth_field_string_size(type); | |
540 | ||
541 | return size; | |
542 | } | |
543 | ||
544 | static const char *synth_field_fmt(char *type) | |
545 | { | |
546 | const char *fmt = "%llu"; | |
547 | ||
548 | if (strcmp(type, "s64") == 0) | |
549 | fmt = "%lld"; | |
550 | else if (strcmp(type, "u64") == 0) | |
551 | fmt = "%llu"; | |
552 | else if (strcmp(type, "s32") == 0) | |
553 | fmt = "%d"; | |
554 | else if (strcmp(type, "u32") == 0) | |
555 | fmt = "%u"; | |
556 | else if (strcmp(type, "s16") == 0) | |
557 | fmt = "%d"; | |
558 | else if (strcmp(type, "u16") == 0) | |
559 | fmt = "%u"; | |
560 | else if (strcmp(type, "s8") == 0) | |
561 | fmt = "%d"; | |
562 | else if (strcmp(type, "u8") == 0) | |
563 | fmt = "%u"; | |
564 | else if (strcmp(type, "char") == 0) | |
565 | fmt = "%d"; | |
566 | else if (strcmp(type, "unsigned char") == 0) | |
567 | fmt = "%u"; | |
568 | else if (strcmp(type, "int") == 0) | |
569 | fmt = "%d"; | |
570 | else if (strcmp(type, "unsigned int") == 0) | |
571 | fmt = "%u"; | |
572 | else if (strcmp(type, "long") == 0) | |
573 | fmt = "%ld"; | |
574 | else if (strcmp(type, "unsigned long") == 0) | |
575 | fmt = "%lu"; | |
576 | else if (strcmp(type, "pid_t") == 0) | |
577 | fmt = "%d"; | |
578 | else if (synth_field_is_string(type)) | |
579 | fmt = "%s"; | |
580 | ||
581 | return fmt; | |
582 | } | |
583 | ||
584 | static enum print_line_t print_synth_event(struct trace_iterator *iter, | |
585 | int flags, | |
586 | struct trace_event *event) | |
587 | { | |
588 | struct trace_array *tr = iter->tr; | |
589 | struct trace_seq *s = &iter->seq; | |
590 | struct synth_trace_event *entry; | |
591 | struct synth_event *se; | |
592 | unsigned int i, n_u64; | |
593 | char print_fmt[32]; | |
594 | const char *fmt; | |
595 | ||
596 | entry = (struct synth_trace_event *)iter->ent; | |
597 | se = container_of(event, struct synth_event, call.event); | |
598 | ||
599 | trace_seq_printf(s, "%s: ", se->name); | |
600 | ||
601 | for (i = 0, n_u64 = 0; i < se->n_fields; i++) { | |
602 | if (trace_seq_has_overflowed(s)) | |
603 | goto end; | |
604 | ||
605 | fmt = synth_field_fmt(se->fields[i]->type); | |
606 | ||
607 | /* parameter types */ | |
608 | if (tr->trace_flags & TRACE_ITER_VERBOSE) | |
609 | trace_seq_printf(s, "%s ", fmt); | |
610 | ||
611 | snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt); | |
612 | ||
613 | /* parameter values */ | |
614 | if (se->fields[i]->is_string) { | |
615 | trace_seq_printf(s, print_fmt, se->fields[i]->name, | |
616 | (char *)&entry->fields[n_u64], | |
617 | i == se->n_fields - 1 ? "" : " "); | |
618 | n_u64 += STR_VAR_LEN_MAX / sizeof(u64); | |
619 | } else { | |
620 | trace_seq_printf(s, print_fmt, se->fields[i]->name, | |
621 | entry->fields[n_u64], | |
622 | i == se->n_fields - 1 ? "" : " "); | |
623 | n_u64++; | |
624 | } | |
625 | } | |
626 | end: | |
627 | trace_seq_putc(s, '\n'); | |
628 | ||
629 | return trace_handle_return(s); | |
630 | } | |
631 | ||
632 | static struct trace_event_functions synth_event_funcs = { | |
633 | .trace = print_synth_event | |
634 | }; | |
635 | ||
636 | static notrace void trace_event_raw_event_synth(void *__data, | |
637 | u64 *var_ref_vals, | |
638 | unsigned int var_ref_idx) | |
639 | { | |
640 | struct trace_event_file *trace_file = __data; | |
641 | struct synth_trace_event *entry; | |
642 | struct trace_event_buffer fbuffer; | |
4708abc6 | 643 | struct ring_buffer *buffer; |
4b147936 TZ |
644 | struct synth_event *event; |
645 | unsigned int i, n_u64; | |
646 | int fields_size = 0; | |
647 | ||
648 | event = trace_file->event_call->data; | |
649 | ||
650 | if (trace_trigger_soft_disabled(trace_file)) | |
651 | return; | |
652 | ||
653 | fields_size = event->n_u64 * sizeof(u64); | |
654 | ||
4708abc6 SRV |
655 | /* |
656 | * Avoid ring buffer recursion detection, as this event | |
657 | * is being performed within another event. | |
658 | */ | |
659 | buffer = trace_file->tr->trace_buffer.buffer; | |
660 | ring_buffer_nest_start(buffer); | |
661 | ||
4b147936 TZ |
662 | entry = trace_event_buffer_reserve(&fbuffer, trace_file, |
663 | sizeof(*entry) + fields_size); | |
664 | if (!entry) | |
4708abc6 | 665 | goto out; |
4b147936 TZ |
666 | |
667 | for (i = 0, n_u64 = 0; i < event->n_fields; i++) { | |
668 | if (event->fields[i]->is_string) { | |
669 | char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i]; | |
670 | char *str_field = (char *)&entry->fields[n_u64]; | |
671 | ||
ad452870 | 672 | strscpy(str_field, str_val, STR_VAR_LEN_MAX); |
4b147936 TZ |
673 | n_u64 += STR_VAR_LEN_MAX / sizeof(u64); |
674 | } else { | |
675 | entry->fields[n_u64] = var_ref_vals[var_ref_idx + i]; | |
676 | n_u64++; | |
677 | } | |
678 | } | |
679 | ||
680 | trace_event_buffer_commit(&fbuffer); | |
4708abc6 SRV |
681 | out: |
682 | ring_buffer_nest_end(buffer); | |
4b147936 TZ |
683 | } |
684 | ||
685 | static void free_synth_event_print_fmt(struct trace_event_call *call) | |
686 | { | |
687 | if (call) { | |
688 | kfree(call->print_fmt); | |
689 | call->print_fmt = NULL; | |
690 | } | |
691 | } | |
692 | ||
693 | static int __set_synth_event_print_fmt(struct synth_event *event, | |
694 | char *buf, int len) | |
695 | { | |
696 | const char *fmt; | |
697 | int pos = 0; | |
698 | int i; | |
699 | ||
700 | /* When len=0, we just calculate the needed length */ | |
701 | #define LEN_OR_ZERO (len ? len - pos : 0) | |
702 | ||
703 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); | |
704 | for (i = 0; i < event->n_fields; i++) { | |
705 | fmt = synth_field_fmt(event->fields[i]->type); | |
706 | pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s", | |
707 | event->fields[i]->name, fmt, | |
708 | i == event->n_fields - 1 ? "" : ", "); | |
709 | } | |
710 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); | |
711 | ||
712 | for (i = 0; i < event->n_fields; i++) { | |
713 | pos += snprintf(buf + pos, LEN_OR_ZERO, | |
714 | ", REC->%s", event->fields[i]->name); | |
715 | } | |
716 | ||
717 | #undef LEN_OR_ZERO | |
718 | ||
719 | /* return the length of print_fmt */ | |
720 | return pos; | |
721 | } | |
722 | ||
723 | static int set_synth_event_print_fmt(struct trace_event_call *call) | |
724 | { | |
725 | struct synth_event *event = call->data; | |
726 | char *print_fmt; | |
727 | int len; | |
728 | ||
729 | /* First: called with 0 length to calculate the needed length */ | |
730 | len = __set_synth_event_print_fmt(event, NULL, 0); | |
731 | ||
732 | print_fmt = kmalloc(len + 1, GFP_KERNEL); | |
733 | if (!print_fmt) | |
734 | return -ENOMEM; | |
735 | ||
736 | /* Second: actually write the @print_fmt */ | |
737 | __set_synth_event_print_fmt(event, print_fmt, len + 1); | |
738 | call->print_fmt = print_fmt; | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
743 | static void free_synth_field(struct synth_field *field) | |
744 | { | |
745 | kfree(field->type); | |
746 | kfree(field->name); | |
747 | kfree(field); | |
748 | } | |
749 | ||
750 | static struct synth_field *parse_synth_field(char *field_type, | |
751 | char *field_name) | |
752 | { | |
753 | struct synth_field *field; | |
754 | int len, ret = 0; | |
755 | char *array; | |
756 | ||
757 | if (field_type[0] == ';') | |
758 | field_type++; | |
759 | ||
760 | len = strlen(field_name); | |
761 | if (field_name[len - 1] == ';') | |
762 | field_name[len - 1] = '\0'; | |
763 | ||
764 | field = kzalloc(sizeof(*field), GFP_KERNEL); | |
765 | if (!field) | |
766 | return ERR_PTR(-ENOMEM); | |
767 | ||
768 | len = strlen(field_type) + 1; | |
769 | array = strchr(field_name, '['); | |
770 | if (array) | |
771 | len += strlen(array); | |
772 | field->type = kzalloc(len, GFP_KERNEL); | |
773 | if (!field->type) { | |
774 | ret = -ENOMEM; | |
775 | goto free; | |
776 | } | |
777 | strcat(field->type, field_type); | |
778 | if (array) { | |
779 | strcat(field->type, array); | |
780 | *array = '\0'; | |
781 | } | |
782 | ||
783 | field->size = synth_field_size(field->type); | |
784 | if (!field->size) { | |
785 | ret = -EINVAL; | |
786 | goto free; | |
787 | } | |
788 | ||
789 | if (synth_field_is_string(field->type)) | |
790 | field->is_string = true; | |
791 | ||
792 | field->is_signed = synth_field_signed(field->type); | |
793 | ||
794 | field->name = kstrdup(field_name, GFP_KERNEL); | |
795 | if (!field->name) { | |
796 | ret = -ENOMEM; | |
797 | goto free; | |
798 | } | |
799 | out: | |
800 | return field; | |
801 | free: | |
802 | free_synth_field(field); | |
803 | field = ERR_PTR(ret); | |
804 | goto out; | |
805 | } | |
806 | ||
807 | static void free_synth_tracepoint(struct tracepoint *tp) | |
808 | { | |
809 | if (!tp) | |
810 | return; | |
811 | ||
812 | kfree(tp->name); | |
813 | kfree(tp); | |
814 | } | |
815 | ||
816 | static struct tracepoint *alloc_synth_tracepoint(char *name) | |
817 | { | |
818 | struct tracepoint *tp; | |
819 | ||
820 | tp = kzalloc(sizeof(*tp), GFP_KERNEL); | |
821 | if (!tp) | |
822 | return ERR_PTR(-ENOMEM); | |
823 | ||
824 | tp->name = kstrdup(name, GFP_KERNEL); | |
825 | if (!tp->name) { | |
826 | kfree(tp); | |
827 | return ERR_PTR(-ENOMEM); | |
828 | } | |
829 | ||
830 | return tp; | |
831 | } | |
832 | ||
833 | typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, | |
834 | unsigned int var_ref_idx); | |
835 | ||
836 | static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, | |
837 | unsigned int var_ref_idx) | |
838 | { | |
839 | struct tracepoint *tp = event->tp; | |
840 | ||
841 | if (unlikely(atomic_read(&tp->key.enabled) > 0)) { | |
842 | struct tracepoint_func *probe_func_ptr; | |
843 | synth_probe_func_t probe_func; | |
844 | void *__data; | |
845 | ||
846 | if (!(cpu_online(raw_smp_processor_id()))) | |
847 | return; | |
848 | ||
849 | probe_func_ptr = rcu_dereference_sched((tp)->funcs); | |
850 | if (probe_func_ptr) { | |
851 | do { | |
852 | probe_func = probe_func_ptr->func; | |
853 | __data = probe_func_ptr->data; | |
854 | probe_func(__data, var_ref_vals, var_ref_idx); | |
855 | } while ((++probe_func_ptr)->func); | |
856 | } | |
857 | } | |
858 | } | |
859 | ||
860 | static struct synth_event *find_synth_event(const char *name) | |
861 | { | |
862 | struct synth_event *event; | |
863 | ||
864 | list_for_each_entry(event, &synth_event_list, list) { | |
865 | if (strcmp(event->name, name) == 0) | |
866 | return event; | |
867 | } | |
868 | ||
869 | return NULL; | |
870 | } | |
871 | ||
872 | static int register_synth_event(struct synth_event *event) | |
873 | { | |
874 | struct trace_event_call *call = &event->call; | |
875 | int ret = 0; | |
876 | ||
877 | event->call.class = &event->class; | |
878 | event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL); | |
879 | if (!event->class.system) { | |
880 | ret = -ENOMEM; | |
881 | goto out; | |
882 | } | |
883 | ||
884 | event->tp = alloc_synth_tracepoint(event->name); | |
885 | if (IS_ERR(event->tp)) { | |
886 | ret = PTR_ERR(event->tp); | |
887 | event->tp = NULL; | |
888 | goto out; | |
889 | } | |
890 | ||
891 | INIT_LIST_HEAD(&call->class->fields); | |
892 | call->event.funcs = &synth_event_funcs; | |
893 | call->class->define_fields = synth_event_define_fields; | |
894 | ||
895 | ret = register_trace_event(&call->event); | |
896 | if (!ret) { | |
897 | ret = -ENODEV; | |
898 | goto out; | |
899 | } | |
900 | call->flags = TRACE_EVENT_FL_TRACEPOINT; | |
901 | call->class->reg = trace_event_reg; | |
902 | call->class->probe = trace_event_raw_event_synth; | |
903 | call->data = event; | |
904 | call->tp = event->tp; | |
905 | ||
906 | ret = trace_add_event_call(call); | |
907 | if (ret) { | |
908 | pr_warn("Failed to register synthetic event: %s\n", | |
909 | trace_event_name(call)); | |
910 | goto err; | |
911 | } | |
912 | ||
913 | ret = set_synth_event_print_fmt(call); | |
914 | if (ret < 0) { | |
915 | trace_remove_event_call(call); | |
916 | goto err; | |
917 | } | |
918 | out: | |
919 | return ret; | |
920 | err: | |
921 | unregister_trace_event(&call->event); | |
922 | goto out; | |
923 | } | |
924 | ||
925 | static int unregister_synth_event(struct synth_event *event) | |
926 | { | |
927 | struct trace_event_call *call = &event->call; | |
928 | int ret; | |
929 | ||
930 | ret = trace_remove_event_call(call); | |
931 | ||
932 | return ret; | |
933 | } | |
934 | ||
935 | static void free_synth_event(struct synth_event *event) | |
936 | { | |
937 | unsigned int i; | |
938 | ||
939 | if (!event) | |
940 | return; | |
941 | ||
942 | for (i = 0; i < event->n_fields; i++) | |
943 | free_synth_field(event->fields[i]); | |
944 | ||
945 | kfree(event->fields); | |
946 | kfree(event->name); | |
947 | kfree(event->class.system); | |
948 | free_synth_tracepoint(event->tp); | |
949 | free_synth_event_print_fmt(&event->call); | |
950 | kfree(event); | |
951 | } | |
952 | ||
953 | static struct synth_event *alloc_synth_event(char *event_name, int n_fields, | |
954 | struct synth_field **fields) | |
955 | { | |
956 | struct synth_event *event; | |
957 | unsigned int i; | |
958 | ||
959 | event = kzalloc(sizeof(*event), GFP_KERNEL); | |
960 | if (!event) { | |
961 | event = ERR_PTR(-ENOMEM); | |
962 | goto out; | |
963 | } | |
964 | ||
965 | event->name = kstrdup(event_name, GFP_KERNEL); | |
966 | if (!event->name) { | |
967 | kfree(event); | |
968 | event = ERR_PTR(-ENOMEM); | |
969 | goto out; | |
970 | } | |
971 | ||
972 | event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL); | |
973 | if (!event->fields) { | |
974 | free_synth_event(event); | |
975 | event = ERR_PTR(-ENOMEM); | |
976 | goto out; | |
977 | } | |
978 | ||
979 | for (i = 0; i < n_fields; i++) | |
980 | event->fields[i] = fields[i]; | |
981 | ||
982 | event->n_fields = n_fields; | |
983 | out: | |
984 | return event; | |
985 | } | |
986 | ||
c282a386 TZ |
987 | static void action_trace(struct hist_trigger_data *hist_data, |
988 | struct tracing_map_elt *elt, void *rec, | |
989 | struct ring_buffer_event *rbe, | |
990 | struct action_data *data, u64 *var_ref_vals) | |
991 | { | |
992 | struct synth_event *event = data->onmatch.synth_event; | |
993 | ||
994 | trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx); | |
995 | } | |
996 | ||
997 | struct hist_var_data { | |
998 | struct list_head list; | |
999 | struct hist_trigger_data *hist_data; | |
1000 | }; | |
1001 | ||
4b147936 TZ |
1002 | static void add_or_delete_synth_event(struct synth_event *event, int delete) |
1003 | { | |
1004 | if (delete) | |
1005 | free_synth_event(event); | |
1006 | else { | |
1007 | mutex_lock(&synth_event_mutex); | |
1008 | if (!find_synth_event(event->name)) | |
1009 | list_add(&event->list, &synth_event_list); | |
1010 | else | |
1011 | free_synth_event(event); | |
1012 | mutex_unlock(&synth_event_mutex); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | static int create_synth_event(int argc, char **argv) | |
1017 | { | |
1018 | struct synth_field *field, *fields[SYNTH_FIELDS_MAX]; | |
1019 | struct synth_event *event = NULL; | |
1020 | bool delete_event = false; | |
1021 | int i, n_fields = 0, ret = 0; | |
1022 | char *name; | |
1023 | ||
1024 | mutex_lock(&synth_event_mutex); | |
1025 | ||
1026 | /* | |
1027 | * Argument syntax: | |
1028 | * - Add synthetic event: <event_name> field[;field] ... | |
1029 | * - Remove synthetic event: !<event_name> field[;field] ... | |
1030 | * where 'field' = type field_name | |
1031 | */ | |
1032 | if (argc < 1) { | |
1033 | ret = -EINVAL; | |
1034 | goto out; | |
1035 | } | |
1036 | ||
1037 | name = argv[0]; | |
1038 | if (name[0] == '!') { | |
1039 | delete_event = true; | |
1040 | name++; | |
1041 | } | |
1042 | ||
1043 | event = find_synth_event(name); | |
1044 | if (event) { | |
1045 | if (delete_event) { | |
1046 | if (event->ref) { | |
1047 | event = NULL; | |
1048 | ret = -EBUSY; | |
1049 | goto out; | |
1050 | } | |
1051 | list_del(&event->list); | |
1052 | goto out; | |
1053 | } | |
1054 | event = NULL; | |
1055 | ret = -EEXIST; | |
1056 | goto out; | |
1057 | } else if (delete_event) | |
1058 | goto out; | |
1059 | ||
1060 | if (argc < 2) { | |
1061 | ret = -EINVAL; | |
1062 | goto out; | |
1063 | } | |
1064 | ||
1065 | for (i = 1; i < argc - 1; i++) { | |
1066 | if (strcmp(argv[i], ";") == 0) | |
1067 | continue; | |
1068 | if (n_fields == SYNTH_FIELDS_MAX) { | |
1069 | ret = -EINVAL; | |
1070 | goto err; | |
1071 | } | |
1072 | ||
1073 | field = parse_synth_field(argv[i], argv[i + 1]); | |
1074 | if (IS_ERR(field)) { | |
1075 | ret = PTR_ERR(field); | |
1076 | goto err; | |
1077 | } | |
1078 | fields[n_fields] = field; | |
1079 | i++; n_fields++; | |
1080 | } | |
1081 | ||
1082 | if (i < argc) { | |
1083 | ret = -EINVAL; | |
1084 | goto err; | |
1085 | } | |
1086 | ||
1087 | event = alloc_synth_event(name, n_fields, fields); | |
1088 | if (IS_ERR(event)) { | |
1089 | ret = PTR_ERR(event); | |
1090 | event = NULL; | |
1091 | goto err; | |
1092 | } | |
1093 | out: | |
1094 | mutex_unlock(&synth_event_mutex); | |
1095 | ||
1096 | if (event) { | |
1097 | if (delete_event) { | |
1098 | ret = unregister_synth_event(event); | |
1099 | add_or_delete_synth_event(event, !ret); | |
1100 | } else { | |
1101 | ret = register_synth_event(event); | |
1102 | add_or_delete_synth_event(event, ret); | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | return ret; | |
1107 | err: | |
1108 | mutex_unlock(&synth_event_mutex); | |
1109 | ||
1110 | for (i = 0; i < n_fields; i++) | |
1111 | free_synth_field(fields[i]); | |
1112 | free_synth_event(event); | |
1113 | ||
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static int release_all_synth_events(void) | |
1118 | { | |
1119 | struct list_head release_events; | |
1120 | struct synth_event *event, *e; | |
1121 | int ret = 0; | |
1122 | ||
1123 | INIT_LIST_HEAD(&release_events); | |
1124 | ||
1125 | mutex_lock(&synth_event_mutex); | |
1126 | ||
1127 | list_for_each_entry(event, &synth_event_list, list) { | |
1128 | if (event->ref) { | |
1129 | mutex_unlock(&synth_event_mutex); | |
1130 | return -EBUSY; | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | list_splice_init(&event->list, &release_events); | |
1135 | ||
1136 | mutex_unlock(&synth_event_mutex); | |
1137 | ||
1138 | list_for_each_entry_safe(event, e, &release_events, list) { | |
1139 | list_del(&event->list); | |
1140 | ||
1141 | ret = unregister_synth_event(event); | |
1142 | add_or_delete_synth_event(event, !ret); | |
1143 | } | |
1144 | ||
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | ||
1149 | static void *synth_events_seq_start(struct seq_file *m, loff_t *pos) | |
1150 | { | |
1151 | mutex_lock(&synth_event_mutex); | |
1152 | ||
1153 | return seq_list_start(&synth_event_list, *pos); | |
1154 | } | |
1155 | ||
1156 | static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
1157 | { | |
1158 | return seq_list_next(v, &synth_event_list, pos); | |
1159 | } | |
1160 | ||
1161 | static void synth_events_seq_stop(struct seq_file *m, void *v) | |
1162 | { | |
1163 | mutex_unlock(&synth_event_mutex); | |
1164 | } | |
1165 | ||
1166 | static int synth_events_seq_show(struct seq_file *m, void *v) | |
1167 | { | |
1168 | struct synth_field *field; | |
1169 | struct synth_event *event = v; | |
1170 | unsigned int i; | |
1171 | ||
1172 | seq_printf(m, "%s\t", event->name); | |
1173 | ||
1174 | for (i = 0; i < event->n_fields; i++) { | |
1175 | field = event->fields[i]; | |
1176 | ||
1177 | /* parameter values */ | |
1178 | seq_printf(m, "%s %s%s", field->type, field->name, | |
1179 | i == event->n_fields - 1 ? "" : "; "); | |
1180 | } | |
1181 | ||
1182 | seq_putc(m, '\n'); | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | static const struct seq_operations synth_events_seq_op = { | |
1188 | .start = synth_events_seq_start, | |
1189 | .next = synth_events_seq_next, | |
1190 | .stop = synth_events_seq_stop, | |
1191 | .show = synth_events_seq_show | |
1192 | }; | |
1193 | ||
1194 | static int synth_events_open(struct inode *inode, struct file *file) | |
1195 | { | |
1196 | int ret; | |
1197 | ||
1198 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { | |
1199 | ret = release_all_synth_events(); | |
1200 | if (ret < 0) | |
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | return seq_open(file, &synth_events_seq_op); | |
1205 | } | |
1206 | ||
1207 | static ssize_t synth_events_write(struct file *file, | |
1208 | const char __user *buffer, | |
1209 | size_t count, loff_t *ppos) | |
1210 | { | |
1211 | return trace_parse_run_command(file, buffer, count, ppos, | |
1212 | create_synth_event); | |
1213 | } | |
1214 | ||
1215 | static const struct file_operations synth_events_fops = { | |
1216 | .open = synth_events_open, | |
1217 | .write = synth_events_write, | |
1218 | .read = seq_read, | |
1219 | .llseek = seq_lseek, | |
1220 | .release = seq_release, | |
1221 | }; | |
1222 | ||
df35d93b TZ |
1223 | static u64 hist_field_timestamp(struct hist_field *hist_field, |
1224 | struct tracing_map_elt *elt, | |
1225 | struct ring_buffer_event *rbe, | |
1226 | void *event) | |
860f9f6b TZ |
1227 | { |
1228 | struct hist_trigger_data *hist_data = hist_field->hist_data; | |
1229 | struct trace_array *tr = hist_data->event_file->tr; | |
1230 | ||
1231 | u64 ts = ring_buffer_event_time_stamp(rbe); | |
1232 | ||
1233 | if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) | |
1234 | ts = ns2usecs(ts); | |
1235 | ||
1236 | return ts; | |
1237 | } | |
1238 | ||
8b7622bf TZ |
1239 | static u64 hist_field_cpu(struct hist_field *hist_field, |
1240 | struct tracing_map_elt *elt, | |
1241 | struct ring_buffer_event *rbe, | |
1242 | void *event) | |
1243 | { | |
1244 | int cpu = smp_processor_id(); | |
1245 | ||
1246 | return cpu; | |
1247 | } | |
1248 | ||
067fe038 TZ |
1249 | static struct hist_field * |
1250 | check_field_for_var_ref(struct hist_field *hist_field, | |
1251 | struct hist_trigger_data *var_data, | |
1252 | unsigned int var_idx) | |
1253 | { | |
1254 | struct hist_field *found = NULL; | |
1255 | ||
1256 | if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) { | |
1257 | if (hist_field->var.idx == var_idx && | |
1258 | hist_field->var.hist_data == var_data) { | |
1259 | found = hist_field; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | return found; | |
1264 | } | |
1265 | ||
1266 | static struct hist_field * | |
1267 | check_field_for_var_refs(struct hist_trigger_data *hist_data, | |
1268 | struct hist_field *hist_field, | |
1269 | struct hist_trigger_data *var_data, | |
1270 | unsigned int var_idx, | |
1271 | unsigned int level) | |
1272 | { | |
1273 | struct hist_field *found = NULL; | |
1274 | unsigned int i; | |
1275 | ||
1276 | if (level > 3) | |
1277 | return found; | |
1278 | ||
1279 | if (!hist_field) | |
1280 | return found; | |
1281 | ||
1282 | found = check_field_for_var_ref(hist_field, var_data, var_idx); | |
1283 | if (found) | |
1284 | return found; | |
1285 | ||
1286 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { | |
1287 | struct hist_field *operand; | |
1288 | ||
1289 | operand = hist_field->operands[i]; | |
1290 | found = check_field_for_var_refs(hist_data, operand, var_data, | |
1291 | var_idx, level + 1); | |
1292 | if (found) | |
1293 | return found; | |
1294 | } | |
1295 | ||
1296 | return found; | |
1297 | } | |
1298 | ||
1299 | static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, | |
1300 | struct hist_trigger_data *var_data, | |
1301 | unsigned int var_idx) | |
1302 | { | |
1303 | struct hist_field *hist_field, *found = NULL; | |
1304 | unsigned int i; | |
1305 | ||
1306 | for_each_hist_field(i, hist_data) { | |
1307 | hist_field = hist_data->fields[i]; | |
1308 | found = check_field_for_var_refs(hist_data, hist_field, | |
1309 | var_data, var_idx, 0); | |
1310 | if (found) | |
1311 | return found; | |
1312 | } | |
1313 | ||
c282a386 TZ |
1314 | for (i = 0; i < hist_data->n_synth_var_refs; i++) { |
1315 | hist_field = hist_data->synth_var_refs[i]; | |
1316 | found = check_field_for_var_refs(hist_data, hist_field, | |
1317 | var_data, var_idx, 0); | |
1318 | if (found) | |
1319 | return found; | |
1320 | } | |
1321 | ||
067fe038 TZ |
1322 | return found; |
1323 | } | |
1324 | ||
1325 | static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, | |
1326 | unsigned int var_idx) | |
1327 | { | |
1328 | struct trace_array *tr = hist_data->event_file->tr; | |
1329 | struct hist_field *found = NULL; | |
1330 | struct hist_var_data *var_data; | |
1331 | ||
1332 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
1333 | if (var_data->hist_data == hist_data) | |
1334 | continue; | |
1335 | found = find_var_ref(var_data->hist_data, hist_data, var_idx); | |
1336 | if (found) | |
1337 | break; | |
1338 | } | |
1339 | ||
1340 | return found; | |
1341 | } | |
1342 | ||
1343 | static bool check_var_refs(struct hist_trigger_data *hist_data) | |
1344 | { | |
1345 | struct hist_field *field; | |
1346 | bool found = false; | |
1347 | int i; | |
1348 | ||
1349 | for_each_hist_field(i, hist_data) { | |
1350 | field = hist_data->fields[i]; | |
1351 | if (field && field->flags & HIST_FIELD_FL_VAR) { | |
1352 | if (find_any_var_ref(hist_data, field->var.idx)) { | |
1353 | found = true; | |
1354 | break; | |
1355 | } | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | return found; | |
1360 | } | |
1361 | ||
1362 | static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) | |
1363 | { | |
1364 | struct trace_array *tr = hist_data->event_file->tr; | |
1365 | struct hist_var_data *var_data, *found = NULL; | |
1366 | ||
1367 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
1368 | if (var_data->hist_data == hist_data) { | |
1369 | found = var_data; | |
1370 | break; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | return found; | |
1375 | } | |
1376 | ||
1377 | static bool field_has_hist_vars(struct hist_field *hist_field, | |
1378 | unsigned int level) | |
1379 | { | |
1380 | int i; | |
1381 | ||
1382 | if (level > 3) | |
1383 | return false; | |
1384 | ||
1385 | if (!hist_field) | |
1386 | return false; | |
1387 | ||
1388 | if (hist_field->flags & HIST_FIELD_FL_VAR || | |
1389 | hist_field->flags & HIST_FIELD_FL_VAR_REF) | |
1390 | return true; | |
1391 | ||
1392 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { | |
1393 | struct hist_field *operand; | |
1394 | ||
1395 | operand = hist_field->operands[i]; | |
1396 | if (field_has_hist_vars(operand, level + 1)) | |
1397 | return true; | |
1398 | } | |
1399 | ||
1400 | return false; | |
1401 | } | |
1402 | ||
1403 | static bool has_hist_vars(struct hist_trigger_data *hist_data) | |
1404 | { | |
1405 | struct hist_field *hist_field; | |
1406 | int i; | |
1407 | ||
1408 | for_each_hist_field(i, hist_data) { | |
1409 | hist_field = hist_data->fields[i]; | |
1410 | if (field_has_hist_vars(hist_field, 0)) | |
1411 | return true; | |
1412 | } | |
1413 | ||
1414 | return false; | |
1415 | } | |
1416 | ||
1417 | static int save_hist_vars(struct hist_trigger_data *hist_data) | |
1418 | { | |
1419 | struct trace_array *tr = hist_data->event_file->tr; | |
1420 | struct hist_var_data *var_data; | |
1421 | ||
1422 | var_data = find_hist_vars(hist_data); | |
1423 | if (var_data) | |
1424 | return 0; | |
1425 | ||
1426 | if (trace_array_get(tr) < 0) | |
1427 | return -ENODEV; | |
1428 | ||
1429 | var_data = kzalloc(sizeof(*var_data), GFP_KERNEL); | |
1430 | if (!var_data) { | |
1431 | trace_array_put(tr); | |
1432 | return -ENOMEM; | |
1433 | } | |
1434 | ||
1435 | var_data->hist_data = hist_data; | |
1436 | list_add(&var_data->list, &tr->hist_vars); | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | static void remove_hist_vars(struct hist_trigger_data *hist_data) | |
1442 | { | |
1443 | struct trace_array *tr = hist_data->event_file->tr; | |
1444 | struct hist_var_data *var_data; | |
1445 | ||
1446 | var_data = find_hist_vars(hist_data); | |
1447 | if (!var_data) | |
1448 | return; | |
1449 | ||
1450 | if (WARN_ON(check_var_refs(hist_data))) | |
1451 | return; | |
1452 | ||
1453 | list_del(&var_data->list); | |
1454 | ||
1455 | kfree(var_data); | |
1456 | ||
1457 | trace_array_put(tr); | |
1458 | } | |
1459 | ||
30350d65 TZ |
1460 | static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, |
1461 | const char *var_name) | |
1462 | { | |
1463 | struct hist_field *hist_field, *found = NULL; | |
1464 | int i; | |
1465 | ||
1466 | for_each_hist_field(i, hist_data) { | |
1467 | hist_field = hist_data->fields[i]; | |
1468 | if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && | |
1469 | strcmp(hist_field->var.name, var_name) == 0) { | |
1470 | found = hist_field; | |
1471 | break; | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | return found; | |
1476 | } | |
1477 | ||
1478 | static struct hist_field *find_var(struct hist_trigger_data *hist_data, | |
1479 | struct trace_event_file *file, | |
1480 | const char *var_name) | |
1481 | { | |
1482 | struct hist_trigger_data *test_data; | |
1483 | struct event_trigger_data *test; | |
1484 | struct hist_field *hist_field; | |
1485 | ||
1486 | hist_field = find_var_field(hist_data, var_name); | |
1487 | if (hist_field) | |
1488 | return hist_field; | |
1489 | ||
1490 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
1491 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
1492 | test_data = test->private_data; | |
1493 | hist_field = find_var_field(test_data, var_name); | |
1494 | if (hist_field) | |
1495 | return hist_field; | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | return NULL; | |
1500 | } | |
1501 | ||
067fe038 TZ |
1502 | static struct trace_event_file *find_var_file(struct trace_array *tr, |
1503 | char *system, | |
1504 | char *event_name, | |
1505 | char *var_name) | |
1506 | { | |
1507 | struct hist_trigger_data *var_hist_data; | |
1508 | struct hist_var_data *var_data; | |
1509 | struct trace_event_file *file, *found = NULL; | |
1510 | ||
1511 | if (system) | |
1512 | return find_event_file(tr, system, event_name); | |
1513 | ||
1514 | list_for_each_entry(var_data, &tr->hist_vars, list) { | |
1515 | var_hist_data = var_data->hist_data; | |
1516 | file = var_hist_data->event_file; | |
1517 | if (file == found) | |
1518 | continue; | |
1519 | ||
1520 | if (find_var_field(var_hist_data, var_name)) { | |
f404da6e TZ |
1521 | if (found) { |
1522 | hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); | |
067fe038 | 1523 | return NULL; |
f404da6e | 1524 | } |
067fe038 TZ |
1525 | |
1526 | found = file; | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | return found; | |
1531 | } | |
1532 | ||
1533 | static struct hist_field *find_file_var(struct trace_event_file *file, | |
1534 | const char *var_name) | |
1535 | { | |
1536 | struct hist_trigger_data *test_data; | |
1537 | struct event_trigger_data *test; | |
1538 | struct hist_field *hist_field; | |
1539 | ||
1540 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
1541 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
1542 | test_data = test->private_data; | |
1543 | hist_field = find_var_field(test_data, var_name); | |
1544 | if (hist_field) | |
1545 | return hist_field; | |
1546 | } | |
1547 | } | |
1548 | ||
1549 | return NULL; | |
1550 | } | |
1551 | ||
c282a386 TZ |
1552 | static struct hist_field * |
1553 | find_match_var(struct hist_trigger_data *hist_data, char *var_name) | |
1554 | { | |
1555 | struct trace_array *tr = hist_data->event_file->tr; | |
1556 | struct hist_field *hist_field, *found = NULL; | |
1557 | struct trace_event_file *file; | |
1558 | unsigned int i; | |
1559 | ||
1560 | for (i = 0; i < hist_data->n_actions; i++) { | |
1561 | struct action_data *data = hist_data->actions[i]; | |
1562 | ||
1563 | if (data->fn == action_trace) { | |
1564 | char *system = data->onmatch.match_event_system; | |
1565 | char *event_name = data->onmatch.match_event; | |
1566 | ||
1567 | file = find_var_file(tr, system, event_name, var_name); | |
1568 | if (!file) | |
1569 | continue; | |
1570 | hist_field = find_file_var(file, var_name); | |
1571 | if (hist_field) { | |
1572 | if (found) { | |
f404da6e | 1573 | hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); |
c282a386 TZ |
1574 | return ERR_PTR(-EINVAL); |
1575 | } | |
1576 | ||
1577 | found = hist_field; | |
1578 | } | |
1579 | } | |
1580 | } | |
1581 | return found; | |
1582 | } | |
1583 | ||
067fe038 TZ |
1584 | static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, |
1585 | char *system, | |
1586 | char *event_name, | |
1587 | char *var_name) | |
1588 | { | |
1589 | struct trace_array *tr = hist_data->event_file->tr; | |
1590 | struct hist_field *hist_field = NULL; | |
1591 | struct trace_event_file *file; | |
1592 | ||
c282a386 TZ |
1593 | if (!system || !event_name) { |
1594 | hist_field = find_match_var(hist_data, var_name); | |
1595 | if (IS_ERR(hist_field)) | |
1596 | return NULL; | |
1597 | if (hist_field) | |
1598 | return hist_field; | |
1599 | } | |
1600 | ||
067fe038 TZ |
1601 | file = find_var_file(tr, system, event_name, var_name); |
1602 | if (!file) | |
1603 | return NULL; | |
1604 | ||
1605 | hist_field = find_file_var(file, var_name); | |
1606 | ||
1607 | return hist_field; | |
1608 | } | |
1609 | ||
af6a29bc TZ |
1610 | struct hist_elt_data { |
1611 | char *comm; | |
067fe038 | 1612 | u64 *var_ref_vals; |
02205a67 | 1613 | char *field_var_str[SYNTH_FIELDS_MAX]; |
af6a29bc TZ |
1614 | }; |
1615 | ||
067fe038 TZ |
1616 | static u64 hist_field_var_ref(struct hist_field *hist_field, |
1617 | struct tracing_map_elt *elt, | |
1618 | struct ring_buffer_event *rbe, | |
1619 | void *event) | |
1620 | { | |
1621 | struct hist_elt_data *elt_data; | |
1622 | u64 var_val = 0; | |
1623 | ||
1624 | elt_data = elt->private_data; | |
1625 | var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; | |
1626 | ||
1627 | return var_val; | |
1628 | } | |
1629 | ||
1630 | static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, | |
1631 | u64 *var_ref_vals, bool self) | |
1632 | { | |
1633 | struct hist_trigger_data *var_data; | |
1634 | struct tracing_map_elt *var_elt; | |
1635 | struct hist_field *hist_field; | |
1636 | unsigned int i, var_idx; | |
1637 | bool resolved = true; | |
1638 | u64 var_val = 0; | |
1639 | ||
1640 | for (i = 0; i < hist_data->n_var_refs; i++) { | |
1641 | hist_field = hist_data->var_refs[i]; | |
1642 | var_idx = hist_field->var.idx; | |
1643 | var_data = hist_field->var.hist_data; | |
1644 | ||
1645 | if (var_data == NULL) { | |
1646 | resolved = false; | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | if ((self && var_data != hist_data) || | |
1651 | (!self && var_data == hist_data)) | |
1652 | continue; | |
1653 | ||
1654 | var_elt = tracing_map_lookup(var_data->map, key); | |
1655 | if (!var_elt) { | |
1656 | resolved = false; | |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | if (!tracing_map_var_set(var_elt, var_idx)) { | |
1661 | resolved = false; | |
1662 | break; | |
1663 | } | |
1664 | ||
1665 | if (self || !hist_field->read_once) | |
1666 | var_val = tracing_map_read_var(var_elt, var_idx); | |
1667 | else | |
1668 | var_val = tracing_map_read_var_once(var_elt, var_idx); | |
1669 | ||
1670 | var_ref_vals[i] = var_val; | |
1671 | } | |
1672 | ||
1673 | return resolved; | |
1674 | } | |
1675 | ||
85013256 TZ |
1676 | static const char *hist_field_name(struct hist_field *field, |
1677 | unsigned int level) | |
1678 | { | |
1679 | const char *field_name = ""; | |
1680 | ||
1681 | if (level > 1) | |
1682 | return field_name; | |
1683 | ||
1684 | if (field->field) | |
1685 | field_name = field->field->name; | |
7e8b88a3 TZ |
1686 | else if (field->flags & HIST_FIELD_FL_LOG2 || |
1687 | field->flags & HIST_FIELD_FL_ALIAS) | |
5819eadd | 1688 | field_name = hist_field_name(field->operands[0], ++level); |
8b7622bf TZ |
1689 | else if (field->flags & HIST_FIELD_FL_CPU) |
1690 | field_name = "cpu"; | |
067fe038 TZ |
1691 | else if (field->flags & HIST_FIELD_FL_EXPR || |
1692 | field->flags & HIST_FIELD_FL_VAR_REF) { | |
1693 | if (field->system) { | |
1694 | static char full_name[MAX_FILTER_STR_VAL]; | |
1695 | ||
1696 | strcat(full_name, field->system); | |
1697 | strcat(full_name, "."); | |
1698 | strcat(full_name, field->event_name); | |
1699 | strcat(full_name, "."); | |
1700 | strcat(full_name, field->name); | |
1701 | field_name = full_name; | |
1702 | } else | |
1703 | field_name = field->name; | |
0ae7961e TZ |
1704 | } else if (field->flags & HIST_FIELD_FL_TIMESTAMP) |
1705 | field_name = "common_timestamp"; | |
85013256 TZ |
1706 | |
1707 | if (field_name == NULL) | |
1708 | field_name = ""; | |
1709 | ||
1710 | return field_name; | |
1711 | } | |
1712 | ||
7ef224d1 TZ |
1713 | static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) |
1714 | { | |
1715 | hist_field_fn_t fn = NULL; | |
1716 | ||
1717 | switch (field_size) { | |
1718 | case 8: | |
1719 | if (field_is_signed) | |
1720 | fn = hist_field_s64; | |
1721 | else | |
1722 | fn = hist_field_u64; | |
1723 | break; | |
1724 | case 4: | |
1725 | if (field_is_signed) | |
1726 | fn = hist_field_s32; | |
1727 | else | |
1728 | fn = hist_field_u32; | |
1729 | break; | |
1730 | case 2: | |
1731 | if (field_is_signed) | |
1732 | fn = hist_field_s16; | |
1733 | else | |
1734 | fn = hist_field_u16; | |
1735 | break; | |
1736 | case 1: | |
1737 | if (field_is_signed) | |
1738 | fn = hist_field_s8; | |
1739 | else | |
1740 | fn = hist_field_u8; | |
1741 | break; | |
1742 | } | |
1743 | ||
1744 | return fn; | |
1745 | } | |
1746 | ||
1747 | static int parse_map_size(char *str) | |
1748 | { | |
1749 | unsigned long size, map_bits; | |
1750 | int ret; | |
1751 | ||
1752 | strsep(&str, "="); | |
1753 | if (!str) { | |
1754 | ret = -EINVAL; | |
1755 | goto out; | |
1756 | } | |
1757 | ||
1758 | ret = kstrtoul(str, 0, &size); | |
1759 | if (ret) | |
1760 | goto out; | |
1761 | ||
1762 | map_bits = ilog2(roundup_pow_of_two(size)); | |
1763 | if (map_bits < TRACING_MAP_BITS_MIN || | |
1764 | map_bits > TRACING_MAP_BITS_MAX) | |
1765 | ret = -EINVAL; | |
1766 | else | |
1767 | ret = map_bits; | |
1768 | out: | |
1769 | return ret; | |
1770 | } | |
1771 | ||
1772 | static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) | |
1773 | { | |
30350d65 TZ |
1774 | unsigned int i; |
1775 | ||
7ef224d1 TZ |
1776 | if (!attrs) |
1777 | return; | |
1778 | ||
30350d65 TZ |
1779 | for (i = 0; i < attrs->n_assignments; i++) |
1780 | kfree(attrs->assignment_str[i]); | |
1781 | ||
0212e2aa TZ |
1782 | for (i = 0; i < attrs->n_actions; i++) |
1783 | kfree(attrs->action_str[i]); | |
1784 | ||
5463bfda | 1785 | kfree(attrs->name); |
e62347d2 | 1786 | kfree(attrs->sort_key_str); |
7ef224d1 | 1787 | kfree(attrs->keys_str); |
f2606835 | 1788 | kfree(attrs->vals_str); |
a4072fe8 | 1789 | kfree(attrs->clock); |
7ef224d1 TZ |
1790 | kfree(attrs); |
1791 | } | |
1792 | ||
0212e2aa TZ |
1793 | static int parse_action(char *str, struct hist_trigger_attrs *attrs) |
1794 | { | |
c282a386 | 1795 | int ret = -EINVAL; |
0212e2aa TZ |
1796 | |
1797 | if (attrs->n_actions >= HIST_ACTIONS_MAX) | |
1798 | return ret; | |
1799 | ||
50450603 TZ |
1800 | if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) || |
1801 | (strncmp(str, "onmax(", strlen("onmax(")) == 0)) { | |
c282a386 TZ |
1802 | attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); |
1803 | if (!attrs->action_str[attrs->n_actions]) { | |
1804 | ret = -ENOMEM; | |
1805 | return ret; | |
1806 | } | |
1807 | attrs->n_actions++; | |
1808 | ret = 0; | |
1809 | } | |
1810 | ||
0212e2aa TZ |
1811 | return ret; |
1812 | } | |
1813 | ||
9b1ae035 TZ |
1814 | static int parse_assignment(char *str, struct hist_trigger_attrs *attrs) |
1815 | { | |
1816 | int ret = 0; | |
1817 | ||
1818 | if ((strncmp(str, "key=", strlen("key=")) == 0) || | |
1819 | (strncmp(str, "keys=", strlen("keys=")) == 0)) { | |
1820 | attrs->keys_str = kstrdup(str, GFP_KERNEL); | |
1821 | if (!attrs->keys_str) { | |
1822 | ret = -ENOMEM; | |
1823 | goto out; | |
1824 | } | |
1825 | } else if ((strncmp(str, "val=", strlen("val=")) == 0) || | |
1826 | (strncmp(str, "vals=", strlen("vals=")) == 0) || | |
1827 | (strncmp(str, "values=", strlen("values=")) == 0)) { | |
1828 | attrs->vals_str = kstrdup(str, GFP_KERNEL); | |
1829 | if (!attrs->vals_str) { | |
1830 | ret = -ENOMEM; | |
1831 | goto out; | |
1832 | } | |
1833 | } else if (strncmp(str, "sort=", strlen("sort=")) == 0) { | |
1834 | attrs->sort_key_str = kstrdup(str, GFP_KERNEL); | |
1835 | if (!attrs->sort_key_str) { | |
1836 | ret = -ENOMEM; | |
1837 | goto out; | |
1838 | } | |
1839 | } else if (strncmp(str, "name=", strlen("name=")) == 0) { | |
1840 | attrs->name = kstrdup(str, GFP_KERNEL); | |
1841 | if (!attrs->name) { | |
1842 | ret = -ENOMEM; | |
1843 | goto out; | |
1844 | } | |
a4072fe8 TZ |
1845 | } else if (strncmp(str, "clock=", strlen("clock=")) == 0) { |
1846 | strsep(&str, "="); | |
1847 | if (!str) { | |
1848 | ret = -EINVAL; | |
1849 | goto out; | |
1850 | } | |
1851 | ||
1852 | str = strstrip(str); | |
1853 | attrs->clock = kstrdup(str, GFP_KERNEL); | |
1854 | if (!attrs->clock) { | |
1855 | ret = -ENOMEM; | |
1856 | goto out; | |
1857 | } | |
9b1ae035 TZ |
1858 | } else if (strncmp(str, "size=", strlen("size=")) == 0) { |
1859 | int map_bits = parse_map_size(str); | |
1860 | ||
1861 | if (map_bits < 0) { | |
1862 | ret = map_bits; | |
1863 | goto out; | |
1864 | } | |
1865 | attrs->map_bits = map_bits; | |
30350d65 TZ |
1866 | } else { |
1867 | char *assignment; | |
1868 | ||
1869 | if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { | |
f404da6e | 1870 | hist_err("Too many variables defined: ", str); |
30350d65 TZ |
1871 | ret = -EINVAL; |
1872 | goto out; | |
1873 | } | |
1874 | ||
1875 | assignment = kstrdup(str, GFP_KERNEL); | |
1876 | if (!assignment) { | |
1877 | ret = -ENOMEM; | |
1878 | goto out; | |
1879 | } | |
1880 | ||
1881 | attrs->assignment_str[attrs->n_assignments++] = assignment; | |
1882 | } | |
9b1ae035 TZ |
1883 | out: |
1884 | return ret; | |
1885 | } | |
1886 | ||
7ef224d1 TZ |
1887 | static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str) |
1888 | { | |
1889 | struct hist_trigger_attrs *attrs; | |
1890 | int ret = 0; | |
1891 | ||
1892 | attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); | |
1893 | if (!attrs) | |
1894 | return ERR_PTR(-ENOMEM); | |
1895 | ||
1896 | while (trigger_str) { | |
1897 | char *str = strsep(&trigger_str, ":"); | |
1898 | ||
9b1ae035 TZ |
1899 | if (strchr(str, '=')) { |
1900 | ret = parse_assignment(str, attrs); | |
1901 | if (ret) | |
1902 | goto free; | |
1903 | } else if (strcmp(str, "pause") == 0) | |
83e99914 TZ |
1904 | attrs->pause = true; |
1905 | else if ((strcmp(str, "cont") == 0) || | |
1906 | (strcmp(str, "continue") == 0)) | |
1907 | attrs->cont = true; | |
e86ae9ba TZ |
1908 | else if (strcmp(str, "clear") == 0) |
1909 | attrs->clear = true; | |
9b1ae035 | 1910 | else { |
0212e2aa TZ |
1911 | ret = parse_action(str, attrs); |
1912 | if (ret) | |
1913 | goto free; | |
7ef224d1 TZ |
1914 | } |
1915 | } | |
1916 | ||
1917 | if (!attrs->keys_str) { | |
1918 | ret = -EINVAL; | |
1919 | goto free; | |
1920 | } | |
1921 | ||
a4072fe8 TZ |
1922 | if (!attrs->clock) { |
1923 | attrs->clock = kstrdup("global", GFP_KERNEL); | |
1924 | if (!attrs->clock) { | |
1925 | ret = -ENOMEM; | |
1926 | goto free; | |
1927 | } | |
1928 | } | |
1929 | ||
7ef224d1 TZ |
1930 | return attrs; |
1931 | free: | |
1932 | destroy_hist_trigger_attrs(attrs); | |
1933 | ||
1934 | return ERR_PTR(ret); | |
1935 | } | |
1936 | ||
6b4827ad TZ |
1937 | static inline void save_comm(char *comm, struct task_struct *task) |
1938 | { | |
1939 | if (!task->pid) { | |
1940 | strcpy(comm, "<idle>"); | |
1941 | return; | |
1942 | } | |
1943 | ||
1944 | if (WARN_ON_ONCE(task->pid < 0)) { | |
1945 | strcpy(comm, "<XXX>"); | |
1946 | return; | |
1947 | } | |
1948 | ||
1949 | memcpy(comm, task->comm, TASK_COMM_LEN); | |
1950 | } | |
1951 | ||
af6a29bc TZ |
1952 | static void hist_elt_data_free(struct hist_elt_data *elt_data) |
1953 | { | |
02205a67 TZ |
1954 | unsigned int i; |
1955 | ||
1956 | for (i = 0; i < SYNTH_FIELDS_MAX; i++) | |
1957 | kfree(elt_data->field_var_str[i]); | |
1958 | ||
af6a29bc TZ |
1959 | kfree(elt_data->comm); |
1960 | kfree(elt_data); | |
1961 | } | |
1962 | ||
1963 | static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) | |
6b4827ad | 1964 | { |
af6a29bc TZ |
1965 | struct hist_elt_data *elt_data = elt->private_data; |
1966 | ||
1967 | hist_elt_data_free(elt_data); | |
6b4827ad TZ |
1968 | } |
1969 | ||
af6a29bc | 1970 | static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) |
6b4827ad TZ |
1971 | { |
1972 | struct hist_trigger_data *hist_data = elt->map->private_data; | |
af6a29bc TZ |
1973 | unsigned int size = TASK_COMM_LEN; |
1974 | struct hist_elt_data *elt_data; | |
6b4827ad | 1975 | struct hist_field *key_field; |
02205a67 | 1976 | unsigned int i, n_str; |
6b4827ad | 1977 | |
af6a29bc TZ |
1978 | elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); |
1979 | if (!elt_data) | |
1980 | return -ENOMEM; | |
1981 | ||
6b4827ad TZ |
1982 | for_each_hist_key_field(i, hist_data) { |
1983 | key_field = hist_data->fields[i]; | |
1984 | ||
1985 | if (key_field->flags & HIST_FIELD_FL_EXECNAME) { | |
af6a29bc TZ |
1986 | elt_data->comm = kzalloc(size, GFP_KERNEL); |
1987 | if (!elt_data->comm) { | |
1988 | kfree(elt_data); | |
6b4827ad | 1989 | return -ENOMEM; |
af6a29bc | 1990 | } |
6b4827ad TZ |
1991 | break; |
1992 | } | |
1993 | } | |
1994 | ||
50450603 | 1995 | n_str = hist_data->n_field_var_str + hist_data->n_max_var_str; |
02205a67 TZ |
1996 | |
1997 | size = STR_VAR_LEN_MAX; | |
1998 | ||
1999 | for (i = 0; i < n_str; i++) { | |
2000 | elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); | |
2001 | if (!elt_data->field_var_str[i]) { | |
2002 | hist_elt_data_free(elt_data); | |
2003 | return -ENOMEM; | |
2004 | } | |
2005 | } | |
2006 | ||
af6a29bc TZ |
2007 | elt->private_data = elt_data; |
2008 | ||
6b4827ad TZ |
2009 | return 0; |
2010 | } | |
2011 | ||
af6a29bc | 2012 | static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) |
6b4827ad | 2013 | { |
af6a29bc | 2014 | struct hist_elt_data *elt_data = elt->private_data; |
6b4827ad | 2015 | |
af6a29bc TZ |
2016 | if (elt_data->comm) |
2017 | save_comm(elt_data->comm, current); | |
6b4827ad TZ |
2018 | } |
2019 | ||
af6a29bc TZ |
2020 | static const struct tracing_map_ops hist_trigger_elt_data_ops = { |
2021 | .elt_alloc = hist_trigger_elt_data_alloc, | |
2022 | .elt_free = hist_trigger_elt_data_free, | |
2023 | .elt_init = hist_trigger_elt_data_init, | |
6b4827ad TZ |
2024 | }; |
2025 | ||
2ece94fb TZ |
2026 | static const char *get_hist_field_flags(struct hist_field *hist_field) |
2027 | { | |
2028 | const char *flags_str = NULL; | |
2029 | ||
2030 | if (hist_field->flags & HIST_FIELD_FL_HEX) | |
2031 | flags_str = "hex"; | |
2032 | else if (hist_field->flags & HIST_FIELD_FL_SYM) | |
2033 | flags_str = "sym"; | |
2034 | else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) | |
2035 | flags_str = "sym-offset"; | |
2036 | else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) | |
2037 | flags_str = "execname"; | |
2038 | else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) | |
2039 | flags_str = "syscall"; | |
2040 | else if (hist_field->flags & HIST_FIELD_FL_LOG2) | |
2041 | flags_str = "log2"; | |
2042 | else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) | |
2043 | flags_str = "usecs"; | |
2044 | ||
2045 | return flags_str; | |
2046 | } | |
2047 | ||
100719dc TZ |
2048 | static void expr_field_str(struct hist_field *field, char *expr) |
2049 | { | |
067fe038 TZ |
2050 | if (field->flags & HIST_FIELD_FL_VAR_REF) |
2051 | strcat(expr, "$"); | |
2052 | ||
100719dc TZ |
2053 | strcat(expr, hist_field_name(field, 0)); |
2054 | ||
76690945 | 2055 | if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) { |
100719dc TZ |
2056 | const char *flags_str = get_hist_field_flags(field); |
2057 | ||
2058 | if (flags_str) { | |
2059 | strcat(expr, "."); | |
2060 | strcat(expr, flags_str); | |
2061 | } | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | static char *expr_str(struct hist_field *field, unsigned int level) | |
2066 | { | |
2067 | char *expr; | |
2068 | ||
2069 | if (level > 1) | |
2070 | return NULL; | |
2071 | ||
2072 | expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2073 | if (!expr) | |
2074 | return NULL; | |
2075 | ||
2076 | if (!field->operands[0]) { | |
2077 | expr_field_str(field, expr); | |
2078 | return expr; | |
2079 | } | |
2080 | ||
2081 | if (field->operator == FIELD_OP_UNARY_MINUS) { | |
2082 | char *subexpr; | |
2083 | ||
2084 | strcat(expr, "-("); | |
2085 | subexpr = expr_str(field->operands[0], ++level); | |
2086 | if (!subexpr) { | |
2087 | kfree(expr); | |
2088 | return NULL; | |
2089 | } | |
2090 | strcat(expr, subexpr); | |
2091 | strcat(expr, ")"); | |
2092 | ||
2093 | kfree(subexpr); | |
2094 | ||
2095 | return expr; | |
2096 | } | |
2097 | ||
2098 | expr_field_str(field->operands[0], expr); | |
2099 | ||
2100 | switch (field->operator) { | |
2101 | case FIELD_OP_MINUS: | |
2102 | strcat(expr, "-"); | |
2103 | break; | |
2104 | case FIELD_OP_PLUS: | |
2105 | strcat(expr, "+"); | |
2106 | break; | |
2107 | default: | |
2108 | kfree(expr); | |
2109 | return NULL; | |
2110 | } | |
2111 | ||
2112 | expr_field_str(field->operands[1], expr); | |
2113 | ||
2114 | return expr; | |
2115 | } | |
2116 | ||
2117 | static int contains_operator(char *str) | |
2118 | { | |
2119 | enum field_op_id field_op = FIELD_OP_NONE; | |
2120 | char *op; | |
2121 | ||
2122 | op = strpbrk(str, "+-"); | |
2123 | if (!op) | |
2124 | return FIELD_OP_NONE; | |
2125 | ||
2126 | switch (*op) { | |
2127 | case '-': | |
2128 | if (*str == '-') | |
2129 | field_op = FIELD_OP_UNARY_MINUS; | |
2130 | else | |
2131 | field_op = FIELD_OP_MINUS; | |
2132 | break; | |
2133 | case '+': | |
2134 | field_op = FIELD_OP_PLUS; | |
2135 | break; | |
2136 | default: | |
2137 | break; | |
2138 | } | |
2139 | ||
2140 | return field_op; | |
2141 | } | |
2142 | ||
5819eadd TZ |
2143 | static void destroy_hist_field(struct hist_field *hist_field, |
2144 | unsigned int level) | |
7ef224d1 | 2145 | { |
5819eadd TZ |
2146 | unsigned int i; |
2147 | ||
100719dc | 2148 | if (level > 3) |
5819eadd TZ |
2149 | return; |
2150 | ||
2151 | if (!hist_field) | |
2152 | return; | |
2153 | ||
2154 | for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) | |
2155 | destroy_hist_field(hist_field->operands[i], level + 1); | |
2156 | ||
30350d65 | 2157 | kfree(hist_field->var.name); |
100719dc | 2158 | kfree(hist_field->name); |
19a9facd | 2159 | kfree(hist_field->type); |
30350d65 | 2160 | |
7ef224d1 TZ |
2161 | kfree(hist_field); |
2162 | } | |
2163 | ||
b559d003 TZ |
2164 | static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, |
2165 | struct ftrace_event_field *field, | |
30350d65 TZ |
2166 | unsigned long flags, |
2167 | char *var_name) | |
7ef224d1 TZ |
2168 | { |
2169 | struct hist_field *hist_field; | |
2170 | ||
2171 | if (field && is_function_field(field)) | |
2172 | return NULL; | |
2173 | ||
2174 | hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
2175 | if (!hist_field) | |
2176 | return NULL; | |
2177 | ||
b559d003 TZ |
2178 | hist_field->hist_data = hist_data; |
2179 | ||
7e8b88a3 | 2180 | if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) |
100719dc TZ |
2181 | goto out; /* caller will populate */ |
2182 | ||
067fe038 TZ |
2183 | if (flags & HIST_FIELD_FL_VAR_REF) { |
2184 | hist_field->fn = hist_field_var_ref; | |
2185 | goto out; | |
2186 | } | |
2187 | ||
7ef224d1 TZ |
2188 | if (flags & HIST_FIELD_FL_HITCOUNT) { |
2189 | hist_field->fn = hist_field_counter; | |
19a9facd TZ |
2190 | hist_field->size = sizeof(u64); |
2191 | hist_field->type = kstrdup("u64", GFP_KERNEL); | |
2192 | if (!hist_field->type) | |
2193 | goto free; | |
7ef224d1 TZ |
2194 | goto out; |
2195 | } | |
2196 | ||
69a0200c TZ |
2197 | if (flags & HIST_FIELD_FL_STACKTRACE) { |
2198 | hist_field->fn = hist_field_none; | |
2199 | goto out; | |
2200 | } | |
2201 | ||
4b94f5b7 | 2202 | if (flags & HIST_FIELD_FL_LOG2) { |
5819eadd | 2203 | unsigned long fl = flags & ~HIST_FIELD_FL_LOG2; |
4b94f5b7 | 2204 | hist_field->fn = hist_field_log2; |
30350d65 | 2205 | hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL); |
5819eadd | 2206 | hist_field->size = hist_field->operands[0]->size; |
19a9facd TZ |
2207 | hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL); |
2208 | if (!hist_field->type) | |
2209 | goto free; | |
4b94f5b7 NK |
2210 | goto out; |
2211 | } | |
2212 | ||
ad42febe TZ |
2213 | if (flags & HIST_FIELD_FL_TIMESTAMP) { |
2214 | hist_field->fn = hist_field_timestamp; | |
2215 | hist_field->size = sizeof(u64); | |
19a9facd TZ |
2216 | hist_field->type = kstrdup("u64", GFP_KERNEL); |
2217 | if (!hist_field->type) | |
2218 | goto free; | |
ad42febe TZ |
2219 | goto out; |
2220 | } | |
2221 | ||
8b7622bf TZ |
2222 | if (flags & HIST_FIELD_FL_CPU) { |
2223 | hist_field->fn = hist_field_cpu; | |
2224 | hist_field->size = sizeof(int); | |
2225 | hist_field->type = kstrdup("unsigned int", GFP_KERNEL); | |
2226 | if (!hist_field->type) | |
2227 | goto free; | |
2228 | goto out; | |
2229 | } | |
2230 | ||
432480c5 TZ |
2231 | if (WARN_ON_ONCE(!field)) |
2232 | goto out; | |
2233 | ||
7ef224d1 TZ |
2234 | if (is_string_field(field)) { |
2235 | flags |= HIST_FIELD_FL_STRING; | |
79e577cb | 2236 | |
19a9facd TZ |
2237 | hist_field->size = MAX_FILTER_STR_VAL; |
2238 | hist_field->type = kstrdup(field->type, GFP_KERNEL); | |
2239 | if (!hist_field->type) | |
2240 | goto free; | |
2241 | ||
79e577cb NK |
2242 | if (field->filter_type == FILTER_STATIC_STRING) |
2243 | hist_field->fn = hist_field_string; | |
2244 | else if (field->filter_type == FILTER_DYN_STRING) | |
2245 | hist_field->fn = hist_field_dynstring; | |
2246 | else | |
2247 | hist_field->fn = hist_field_pstring; | |
7ef224d1 | 2248 | } else { |
19a9facd TZ |
2249 | hist_field->size = field->size; |
2250 | hist_field->is_signed = field->is_signed; | |
2251 | hist_field->type = kstrdup(field->type, GFP_KERNEL); | |
2252 | if (!hist_field->type) | |
2253 | goto free; | |
2254 | ||
7ef224d1 TZ |
2255 | hist_field->fn = select_value_fn(field->size, |
2256 | field->is_signed); | |
2257 | if (!hist_field->fn) { | |
5819eadd | 2258 | destroy_hist_field(hist_field, 0); |
7ef224d1 TZ |
2259 | return NULL; |
2260 | } | |
2261 | } | |
2262 | out: | |
2263 | hist_field->field = field; | |
2264 | hist_field->flags = flags; | |
2265 | ||
30350d65 TZ |
2266 | if (var_name) { |
2267 | hist_field->var.name = kstrdup(var_name, GFP_KERNEL); | |
2268 | if (!hist_field->var.name) | |
2269 | goto free; | |
2270 | } | |
2271 | ||
7ef224d1 | 2272 | return hist_field; |
30350d65 TZ |
2273 | free: |
2274 | destroy_hist_field(hist_field, 0); | |
2275 | return NULL; | |
7ef224d1 TZ |
2276 | } |
2277 | ||
2278 | static void destroy_hist_fields(struct hist_trigger_data *hist_data) | |
2279 | { | |
2280 | unsigned int i; | |
2281 | ||
30350d65 | 2282 | for (i = 0; i < HIST_FIELDS_MAX; i++) { |
7ef224d1 | 2283 | if (hist_data->fields[i]) { |
5819eadd | 2284 | destroy_hist_field(hist_data->fields[i], 0); |
7ef224d1 TZ |
2285 | hist_data->fields[i] = NULL; |
2286 | } | |
2287 | } | |
2288 | } | |
2289 | ||
067fe038 TZ |
2290 | static int init_var_ref(struct hist_field *ref_field, |
2291 | struct hist_field *var_field, | |
2292 | char *system, char *event_name) | |
2293 | { | |
2294 | int err = 0; | |
2295 | ||
2296 | ref_field->var.idx = var_field->var.idx; | |
2297 | ref_field->var.hist_data = var_field->hist_data; | |
2298 | ref_field->size = var_field->size; | |
2299 | ref_field->is_signed = var_field->is_signed; | |
2300 | ref_field->flags |= var_field->flags & | |
2301 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2302 | ||
2303 | if (system) { | |
2304 | ref_field->system = kstrdup(system, GFP_KERNEL); | |
2305 | if (!ref_field->system) | |
2306 | return -ENOMEM; | |
2307 | } | |
2308 | ||
2309 | if (event_name) { | |
2310 | ref_field->event_name = kstrdup(event_name, GFP_KERNEL); | |
2311 | if (!ref_field->event_name) { | |
2312 | err = -ENOMEM; | |
2313 | goto free; | |
2314 | } | |
2315 | } | |
2316 | ||
7e8b88a3 TZ |
2317 | if (var_field->var.name) { |
2318 | ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL); | |
2319 | if (!ref_field->name) { | |
2320 | err = -ENOMEM; | |
2321 | goto free; | |
2322 | } | |
2323 | } else if (var_field->name) { | |
2324 | ref_field->name = kstrdup(var_field->name, GFP_KERNEL); | |
2325 | if (!ref_field->name) { | |
2326 | err = -ENOMEM; | |
2327 | goto free; | |
2328 | } | |
067fe038 TZ |
2329 | } |
2330 | ||
2331 | ref_field->type = kstrdup(var_field->type, GFP_KERNEL); | |
2332 | if (!ref_field->type) { | |
2333 | err = -ENOMEM; | |
2334 | goto free; | |
2335 | } | |
2336 | out: | |
2337 | return err; | |
2338 | free: | |
2339 | kfree(ref_field->system); | |
2340 | kfree(ref_field->event_name); | |
2341 | kfree(ref_field->name); | |
2342 | ||
2343 | goto out; | |
2344 | } | |
2345 | ||
2346 | static struct hist_field *create_var_ref(struct hist_field *var_field, | |
2347 | char *system, char *event_name) | |
2348 | { | |
2349 | unsigned long flags = HIST_FIELD_FL_VAR_REF; | |
2350 | struct hist_field *ref_field; | |
2351 | ||
2352 | ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL); | |
2353 | if (ref_field) { | |
2354 | if (init_var_ref(ref_field, var_field, system, event_name)) { | |
2355 | destroy_hist_field(ref_field, 0); | |
2356 | return NULL; | |
2357 | } | |
2358 | } | |
2359 | ||
2360 | return ref_field; | |
2361 | } | |
2362 | ||
2363 | static bool is_var_ref(char *var_name) | |
2364 | { | |
2365 | if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') | |
2366 | return false; | |
2367 | ||
2368 | return true; | |
2369 | } | |
2370 | ||
2371 | static char *field_name_from_var(struct hist_trigger_data *hist_data, | |
2372 | char *var_name) | |
2373 | { | |
2374 | char *name, *field; | |
2375 | unsigned int i; | |
2376 | ||
2377 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { | |
2378 | name = hist_data->attrs->var_defs.name[i]; | |
2379 | ||
2380 | if (strcmp(var_name, name) == 0) { | |
2381 | field = hist_data->attrs->var_defs.expr[i]; | |
2382 | if (contains_operator(field) || is_var_ref(field)) | |
2383 | continue; | |
2384 | return field; | |
2385 | } | |
2386 | } | |
2387 | ||
2388 | return NULL; | |
2389 | } | |
2390 | ||
2391 | static char *local_field_var_ref(struct hist_trigger_data *hist_data, | |
2392 | char *system, char *event_name, | |
2393 | char *var_name) | |
2394 | { | |
2395 | struct trace_event_call *call; | |
2396 | ||
2397 | if (system && event_name) { | |
2398 | call = hist_data->event_file->event_call; | |
2399 | ||
2400 | if (strcmp(system, call->class->system) != 0) | |
2401 | return NULL; | |
2402 | ||
2403 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
2404 | return NULL; | |
2405 | } | |
2406 | ||
2407 | if (!!system != !!event_name) | |
2408 | return NULL; | |
2409 | ||
2410 | if (!is_var_ref(var_name)) | |
2411 | return NULL; | |
2412 | ||
2413 | var_name++; | |
2414 | ||
2415 | return field_name_from_var(hist_data, var_name); | |
2416 | } | |
2417 | ||
2418 | static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, | |
2419 | char *system, char *event_name, | |
2420 | char *var_name) | |
2421 | { | |
2422 | struct hist_field *var_field = NULL, *ref_field = NULL; | |
2423 | ||
2424 | if (!is_var_ref(var_name)) | |
2425 | return NULL; | |
2426 | ||
2427 | var_name++; | |
2428 | ||
2429 | var_field = find_event_var(hist_data, system, event_name, var_name); | |
2430 | if (var_field) | |
2431 | ref_field = create_var_ref(var_field, system, event_name); | |
2432 | ||
f404da6e TZ |
2433 | if (!ref_field) |
2434 | hist_err_event("Couldn't find variable: $", | |
2435 | system, event_name, var_name); | |
2436 | ||
067fe038 TZ |
2437 | return ref_field; |
2438 | } | |
2439 | ||
100719dc TZ |
2440 | static struct ftrace_event_field * |
2441 | parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, | |
2442 | char *field_str, unsigned long *flags) | |
2443 | { | |
2444 | struct ftrace_event_field *field = NULL; | |
2445 | char *field_name, *modifier, *str; | |
2446 | ||
2447 | modifier = str = kstrdup(field_str, GFP_KERNEL); | |
2448 | if (!modifier) | |
2449 | return ERR_PTR(-ENOMEM); | |
2450 | ||
2451 | field_name = strsep(&modifier, "."); | |
2452 | if (modifier) { | |
2453 | if (strcmp(modifier, "hex") == 0) | |
2454 | *flags |= HIST_FIELD_FL_HEX; | |
2455 | else if (strcmp(modifier, "sym") == 0) | |
2456 | *flags |= HIST_FIELD_FL_SYM; | |
2457 | else if (strcmp(modifier, "sym-offset") == 0) | |
2458 | *flags |= HIST_FIELD_FL_SYM_OFFSET; | |
2459 | else if ((strcmp(modifier, "execname") == 0) && | |
2460 | (strcmp(field_name, "common_pid") == 0)) | |
2461 | *flags |= HIST_FIELD_FL_EXECNAME; | |
2462 | else if (strcmp(modifier, "syscall") == 0) | |
2463 | *flags |= HIST_FIELD_FL_SYSCALL; | |
2464 | else if (strcmp(modifier, "log2") == 0) | |
2465 | *flags |= HIST_FIELD_FL_LOG2; | |
2466 | else if (strcmp(modifier, "usecs") == 0) | |
2467 | *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; | |
2468 | else { | |
dcf23457 | 2469 | hist_err("Invalid field modifier: ", modifier); |
100719dc TZ |
2470 | field = ERR_PTR(-EINVAL); |
2471 | goto out; | |
2472 | } | |
2473 | } | |
2474 | ||
2475 | if (strcmp(field_name, "common_timestamp") == 0) { | |
2476 | *flags |= HIST_FIELD_FL_TIMESTAMP; | |
2477 | hist_data->enable_timestamps = true; | |
2478 | if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) | |
2479 | hist_data->attrs->ts_in_usecs = true; | |
8b7622bf TZ |
2480 | } else if (strcmp(field_name, "cpu") == 0) |
2481 | *flags |= HIST_FIELD_FL_CPU; | |
2482 | else { | |
100719dc TZ |
2483 | field = trace_find_event_field(file->event_call, field_name); |
2484 | if (!field || !field->size) { | |
5ec432d7 | 2485 | hist_err("Couldn't find field: ", field_name); |
100719dc TZ |
2486 | field = ERR_PTR(-EINVAL); |
2487 | goto out; | |
2488 | } | |
2489 | } | |
2490 | out: | |
2491 | kfree(str); | |
2492 | ||
2493 | return field; | |
2494 | } | |
2495 | ||
7e8b88a3 TZ |
2496 | static struct hist_field *create_alias(struct hist_trigger_data *hist_data, |
2497 | struct hist_field *var_ref, | |
2498 | char *var_name) | |
2499 | { | |
2500 | struct hist_field *alias = NULL; | |
2501 | unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; | |
2502 | ||
2503 | alias = create_hist_field(hist_data, NULL, flags, var_name); | |
2504 | if (!alias) | |
2505 | return NULL; | |
2506 | ||
2507 | alias->fn = var_ref->fn; | |
2508 | alias->operands[0] = var_ref; | |
2509 | ||
2510 | if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { | |
2511 | destroy_hist_field(alias, 0); | |
2512 | return NULL; | |
2513 | } | |
2514 | ||
2515 | return alias; | |
2516 | } | |
2517 | ||
100719dc TZ |
2518 | static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, |
2519 | struct trace_event_file *file, char *str, | |
2520 | unsigned long *flags, char *var_name) | |
2521 | { | |
067fe038 | 2522 | char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; |
100719dc TZ |
2523 | struct ftrace_event_field *field = NULL; |
2524 | struct hist_field *hist_field = NULL; | |
2525 | int ret = 0; | |
2526 | ||
067fe038 TZ |
2527 | s = strchr(str, '.'); |
2528 | if (s) { | |
2529 | s = strchr(++s, '.'); | |
2530 | if (s) { | |
2531 | ref_system = strsep(&str, "."); | |
2532 | if (!str) { | |
2533 | ret = -EINVAL; | |
2534 | goto out; | |
2535 | } | |
2536 | ref_event = strsep(&str, "."); | |
2537 | if (!str) { | |
2538 | ret = -EINVAL; | |
2539 | goto out; | |
2540 | } | |
2541 | ref_var = str; | |
2542 | } | |
2543 | } | |
2544 | ||
2545 | s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); | |
2546 | if (!s) { | |
2547 | hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var); | |
2548 | if (hist_field) { | |
2549 | hist_data->var_refs[hist_data->n_var_refs] = hist_field; | |
2550 | hist_field->var_ref_idx = hist_data->n_var_refs++; | |
7e8b88a3 TZ |
2551 | if (var_name) { |
2552 | hist_field = create_alias(hist_data, hist_field, var_name); | |
2553 | if (!hist_field) { | |
2554 | ret = -ENOMEM; | |
2555 | goto out; | |
2556 | } | |
2557 | } | |
067fe038 TZ |
2558 | return hist_field; |
2559 | } | |
2560 | } else | |
2561 | str = s; | |
2562 | ||
100719dc TZ |
2563 | field = parse_field(hist_data, file, str, flags); |
2564 | if (IS_ERR(field)) { | |
2565 | ret = PTR_ERR(field); | |
2566 | goto out; | |
2567 | } | |
2568 | ||
2569 | hist_field = create_hist_field(hist_data, field, *flags, var_name); | |
2570 | if (!hist_field) { | |
2571 | ret = -ENOMEM; | |
2572 | goto out; | |
2573 | } | |
2574 | ||
2575 | return hist_field; | |
2576 | out: | |
2577 | return ERR_PTR(ret); | |
2578 | } | |
2579 | ||
2580 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2581 | struct trace_event_file *file, | |
2582 | char *str, unsigned long flags, | |
2583 | char *var_name, unsigned int level); | |
2584 | ||
2585 | static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, | |
2586 | struct trace_event_file *file, | |
2587 | char *str, unsigned long flags, | |
2588 | char *var_name, unsigned int level) | |
2589 | { | |
2590 | struct hist_field *operand1, *expr = NULL; | |
2591 | unsigned long operand_flags; | |
2592 | int ret = 0; | |
2593 | char *s; | |
2594 | ||
2595 | /* we support only -(xxx) i.e. explicit parens required */ | |
2596 | ||
2597 | if (level > 3) { | |
f404da6e | 2598 | hist_err("Too many subexpressions (3 max): ", str); |
100719dc TZ |
2599 | ret = -EINVAL; |
2600 | goto free; | |
2601 | } | |
2602 | ||
2603 | str++; /* skip leading '-' */ | |
2604 | ||
2605 | s = strchr(str, '('); | |
2606 | if (s) | |
2607 | str++; | |
2608 | else { | |
2609 | ret = -EINVAL; | |
2610 | goto free; | |
2611 | } | |
2612 | ||
2613 | s = strrchr(str, ')'); | |
2614 | if (s) | |
2615 | *s = '\0'; | |
2616 | else { | |
2617 | ret = -EINVAL; /* no closing ')' */ | |
2618 | goto free; | |
2619 | } | |
2620 | ||
2621 | flags |= HIST_FIELD_FL_EXPR; | |
2622 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2623 | if (!expr) { | |
2624 | ret = -ENOMEM; | |
2625 | goto free; | |
2626 | } | |
2627 | ||
2628 | operand_flags = 0; | |
2629 | operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); | |
2630 | if (IS_ERR(operand1)) { | |
2631 | ret = PTR_ERR(operand1); | |
2632 | goto free; | |
2633 | } | |
2634 | ||
2635 | expr->flags |= operand1->flags & | |
2636 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2637 | expr->fn = hist_field_unary_minus; | |
2638 | expr->operands[0] = operand1; | |
2639 | expr->operator = FIELD_OP_UNARY_MINUS; | |
2640 | expr->name = expr_str(expr, 0); | |
19a9facd TZ |
2641 | expr->type = kstrdup(operand1->type, GFP_KERNEL); |
2642 | if (!expr->type) { | |
2643 | ret = -ENOMEM; | |
2644 | goto free; | |
2645 | } | |
100719dc TZ |
2646 | |
2647 | return expr; | |
2648 | free: | |
2649 | destroy_hist_field(expr, 0); | |
2650 | return ERR_PTR(ret); | |
2651 | } | |
2652 | ||
2653 | static int check_expr_operands(struct hist_field *operand1, | |
2654 | struct hist_field *operand2) | |
2655 | { | |
2656 | unsigned long operand1_flags = operand1->flags; | |
2657 | unsigned long operand2_flags = operand2->flags; | |
2658 | ||
7e8b88a3 TZ |
2659 | if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || |
2660 | (operand1_flags & HIST_FIELD_FL_ALIAS)) { | |
2661 | struct hist_field *var; | |
2662 | ||
2663 | var = find_var_field(operand1->var.hist_data, operand1->name); | |
2664 | if (!var) | |
2665 | return -EINVAL; | |
2666 | operand1_flags = var->flags; | |
2667 | } | |
2668 | ||
2669 | if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || | |
2670 | (operand2_flags & HIST_FIELD_FL_ALIAS)) { | |
2671 | struct hist_field *var; | |
2672 | ||
2673 | var = find_var_field(operand2->var.hist_data, operand2->name); | |
2674 | if (!var) | |
2675 | return -EINVAL; | |
2676 | operand2_flags = var->flags; | |
2677 | } | |
2678 | ||
100719dc | 2679 | if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != |
f404da6e TZ |
2680 | (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { |
2681 | hist_err("Timestamp units in expression don't match", NULL); | |
100719dc | 2682 | return -EINVAL; |
f404da6e | 2683 | } |
100719dc TZ |
2684 | |
2685 | return 0; | |
2686 | } | |
2687 | ||
2688 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2689 | struct trace_event_file *file, | |
2690 | char *str, unsigned long flags, | |
2691 | char *var_name, unsigned int level) | |
2692 | { | |
2693 | struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; | |
2694 | unsigned long operand_flags; | |
2695 | int field_op, ret = -EINVAL; | |
2696 | char *sep, *operand1_str; | |
2697 | ||
f404da6e TZ |
2698 | if (level > 3) { |
2699 | hist_err("Too many subexpressions (3 max): ", str); | |
100719dc | 2700 | return ERR_PTR(-EINVAL); |
f404da6e | 2701 | } |
100719dc TZ |
2702 | |
2703 | field_op = contains_operator(str); | |
2704 | ||
2705 | if (field_op == FIELD_OP_NONE) | |
2706 | return parse_atom(hist_data, file, str, &flags, var_name); | |
2707 | ||
2708 | if (field_op == FIELD_OP_UNARY_MINUS) | |
2709 | return parse_unary(hist_data, file, str, flags, var_name, ++level); | |
2710 | ||
2711 | switch (field_op) { | |
2712 | case FIELD_OP_MINUS: | |
2713 | sep = "-"; | |
2714 | break; | |
2715 | case FIELD_OP_PLUS: | |
2716 | sep = "+"; | |
2717 | break; | |
2718 | default: | |
2719 | goto free; | |
2720 | } | |
2721 | ||
2722 | operand1_str = strsep(&str, sep); | |
2723 | if (!operand1_str || !str) | |
2724 | goto free; | |
2725 | ||
2726 | operand_flags = 0; | |
2727 | operand1 = parse_atom(hist_data, file, operand1_str, | |
2728 | &operand_flags, NULL); | |
2729 | if (IS_ERR(operand1)) { | |
2730 | ret = PTR_ERR(operand1); | |
2731 | operand1 = NULL; | |
2732 | goto free; | |
2733 | } | |
2734 | ||
2735 | /* rest of string could be another expression e.g. b+c in a+b+c */ | |
2736 | operand_flags = 0; | |
2737 | operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); | |
2738 | if (IS_ERR(operand2)) { | |
2739 | ret = PTR_ERR(operand2); | |
2740 | operand2 = NULL; | |
2741 | goto free; | |
2742 | } | |
2743 | ||
2744 | ret = check_expr_operands(operand1, operand2); | |
2745 | if (ret) | |
2746 | goto free; | |
2747 | ||
2748 | flags |= HIST_FIELD_FL_EXPR; | |
2749 | ||
2750 | flags |= operand1->flags & | |
2751 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2752 | ||
2753 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2754 | if (!expr) { | |
2755 | ret = -ENOMEM; | |
2756 | goto free; | |
2757 | } | |
2758 | ||
067fe038 TZ |
2759 | operand1->read_once = true; |
2760 | operand2->read_once = true; | |
2761 | ||
100719dc TZ |
2762 | expr->operands[0] = operand1; |
2763 | expr->operands[1] = operand2; | |
2764 | expr->operator = field_op; | |
2765 | expr->name = expr_str(expr, 0); | |
19a9facd TZ |
2766 | expr->type = kstrdup(operand1->type, GFP_KERNEL); |
2767 | if (!expr->type) { | |
2768 | ret = -ENOMEM; | |
2769 | goto free; | |
2770 | } | |
100719dc TZ |
2771 | |
2772 | switch (field_op) { | |
2773 | case FIELD_OP_MINUS: | |
2774 | expr->fn = hist_field_minus; | |
2775 | break; | |
2776 | case FIELD_OP_PLUS: | |
2777 | expr->fn = hist_field_plus; | |
2778 | break; | |
2779 | default: | |
5e4cf2bf | 2780 | ret = -EINVAL; |
100719dc TZ |
2781 | goto free; |
2782 | } | |
2783 | ||
2784 | return expr; | |
2785 | free: | |
2786 | destroy_hist_field(operand1, 0); | |
2787 | destroy_hist_field(operand2, 0); | |
2788 | destroy_hist_field(expr, 0); | |
2789 | ||
2790 | return ERR_PTR(ret); | |
2791 | } | |
2792 | ||
02205a67 TZ |
2793 | static char *find_trigger_filter(struct hist_trigger_data *hist_data, |
2794 | struct trace_event_file *file) | |
2795 | { | |
2796 | struct event_trigger_data *test; | |
2797 | ||
2798 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
2799 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
2800 | if (test->private_data == hist_data) | |
2801 | return test->filter_str; | |
2802 | } | |
2803 | } | |
2804 | ||
2805 | return NULL; | |
2806 | } | |
2807 | ||
2808 | static struct event_command trigger_hist_cmd; | |
2809 | static int event_hist_trigger_func(struct event_command *cmd_ops, | |
2810 | struct trace_event_file *file, | |
2811 | char *glob, char *cmd, char *param); | |
2812 | ||
2813 | static bool compatible_keys(struct hist_trigger_data *target_hist_data, | |
2814 | struct hist_trigger_data *hist_data, | |
2815 | unsigned int n_keys) | |
2816 | { | |
2817 | struct hist_field *target_hist_field, *hist_field; | |
2818 | unsigned int n, i, j; | |
2819 | ||
2820 | if (hist_data->n_fields - hist_data->n_vals != n_keys) | |
2821 | return false; | |
2822 | ||
2823 | i = hist_data->n_vals; | |
2824 | j = target_hist_data->n_vals; | |
2825 | ||
2826 | for (n = 0; n < n_keys; n++) { | |
2827 | hist_field = hist_data->fields[i + n]; | |
2828 | target_hist_field = target_hist_data->fields[j + n]; | |
2829 | ||
2830 | if (strcmp(hist_field->type, target_hist_field->type) != 0) | |
2831 | return false; | |
2832 | if (hist_field->size != target_hist_field->size) | |
2833 | return false; | |
2834 | if (hist_field->is_signed != target_hist_field->is_signed) | |
2835 | return false; | |
2836 | } | |
2837 | ||
2838 | return true; | |
2839 | } | |
2840 | ||
2841 | static struct hist_trigger_data * | |
2842 | find_compatible_hist(struct hist_trigger_data *target_hist_data, | |
2843 | struct trace_event_file *file) | |
2844 | { | |
2845 | struct hist_trigger_data *hist_data; | |
2846 | struct event_trigger_data *test; | |
2847 | unsigned int n_keys; | |
2848 | ||
2849 | n_keys = target_hist_data->n_fields - target_hist_data->n_vals; | |
2850 | ||
2851 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
2852 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
2853 | hist_data = test->private_data; | |
2854 | ||
2855 | if (compatible_keys(target_hist_data, hist_data, n_keys)) | |
2856 | return hist_data; | |
2857 | } | |
2858 | } | |
2859 | ||
2860 | return NULL; | |
2861 | } | |
2862 | ||
2863 | static struct trace_event_file *event_file(struct trace_array *tr, | |
2864 | char *system, char *event_name) | |
2865 | { | |
2866 | struct trace_event_file *file; | |
2867 | ||
3be4c1e5 | 2868 | file = __find_event_file(tr, system, event_name); |
02205a67 TZ |
2869 | if (!file) |
2870 | return ERR_PTR(-EINVAL); | |
2871 | ||
2872 | return file; | |
2873 | } | |
2874 | ||
2875 | static struct hist_field * | |
2876 | find_synthetic_field_var(struct hist_trigger_data *target_hist_data, | |
2877 | char *system, char *event_name, char *field_name) | |
2878 | { | |
2879 | struct hist_field *event_var; | |
2880 | char *synthetic_name; | |
2881 | ||
2882 | synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2883 | if (!synthetic_name) | |
2884 | return ERR_PTR(-ENOMEM); | |
2885 | ||
2886 | strcpy(synthetic_name, "synthetic_"); | |
2887 | strcat(synthetic_name, field_name); | |
2888 | ||
2889 | event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); | |
2890 | ||
2891 | kfree(synthetic_name); | |
2892 | ||
2893 | return event_var; | |
2894 | } | |
2895 | ||
2896 | /** | |
2897 | * create_field_var_hist - Automatically create a histogram and var for a field | |
2898 | * @target_hist_data: The target hist trigger | |
2899 | * @subsys_name: Optional subsystem name | |
2900 | * @event_name: Optional event name | |
2901 | * @field_name: The name of the field (and the resulting variable) | |
2902 | * | |
2903 | * Hist trigger actions fetch data from variables, not directly from | |
2904 | * events. However, for convenience, users are allowed to directly | |
2905 | * specify an event field in an action, which will be automatically | |
2906 | * converted into a variable on their behalf. | |
2907 | ||
2908 | * If a user specifies a field on an event that isn't the event the | |
2909 | * histogram currently being defined (the target event histogram), the | |
2910 | * only way that can be accomplished is if a new hist trigger is | |
2911 | * created and the field variable defined on that. | |
2912 | * | |
2913 | * This function creates a new histogram compatible with the target | |
2914 | * event (meaning a histogram with the same key as the target | |
2915 | * histogram), and creates a variable for the specified field, but | |
2916 | * with 'synthetic_' prepended to the variable name in order to avoid | |
2917 | * collision with normal field variables. | |
2918 | * | |
2919 | * Return: The variable created for the field. | |
2920 | */ | |
c282a386 | 2921 | static struct hist_field * |
02205a67 TZ |
2922 | create_field_var_hist(struct hist_trigger_data *target_hist_data, |
2923 | char *subsys_name, char *event_name, char *field_name) | |
2924 | { | |
2925 | struct trace_array *tr = target_hist_data->event_file->tr; | |
2926 | struct hist_field *event_var = ERR_PTR(-EINVAL); | |
2927 | struct hist_trigger_data *hist_data; | |
2928 | unsigned int i, n, first = true; | |
2929 | struct field_var_hist *var_hist; | |
2930 | struct trace_event_file *file; | |
2931 | struct hist_field *key_field; | |
2932 | char *saved_filter; | |
2933 | char *cmd; | |
2934 | int ret; | |
2935 | ||
f404da6e TZ |
2936 | if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { |
2937 | hist_err_event("onmatch: Too many field variables defined: ", | |
2938 | subsys_name, event_name, field_name); | |
02205a67 | 2939 | return ERR_PTR(-EINVAL); |
f404da6e | 2940 | } |
02205a67 TZ |
2941 | |
2942 | file = event_file(tr, subsys_name, event_name); | |
2943 | ||
2944 | if (IS_ERR(file)) { | |
f404da6e TZ |
2945 | hist_err_event("onmatch: Event file not found: ", |
2946 | subsys_name, event_name, field_name); | |
02205a67 TZ |
2947 | ret = PTR_ERR(file); |
2948 | return ERR_PTR(ret); | |
2949 | } | |
2950 | ||
2951 | /* | |
2952 | * Look for a histogram compatible with target. We'll use the | |
2953 | * found histogram specification to create a new matching | |
2954 | * histogram with our variable on it. target_hist_data is not | |
2955 | * yet a registered histogram so we can't use that. | |
2956 | */ | |
2957 | hist_data = find_compatible_hist(target_hist_data, file); | |
f404da6e TZ |
2958 | if (!hist_data) { |
2959 | hist_err_event("onmatch: Matching event histogram not found: ", | |
2960 | subsys_name, event_name, field_name); | |
02205a67 | 2961 | return ERR_PTR(-EINVAL); |
f404da6e | 2962 | } |
02205a67 TZ |
2963 | |
2964 | /* See if a synthetic field variable has already been created */ | |
2965 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
2966 | event_name, field_name); | |
2967 | if (!IS_ERR_OR_NULL(event_var)) | |
2968 | return event_var; | |
2969 | ||
2970 | var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); | |
2971 | if (!var_hist) | |
2972 | return ERR_PTR(-ENOMEM); | |
2973 | ||
2974 | cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2975 | if (!cmd) { | |
2976 | kfree(var_hist); | |
2977 | return ERR_PTR(-ENOMEM); | |
2978 | } | |
2979 | ||
2980 | /* Use the same keys as the compatible histogram */ | |
2981 | strcat(cmd, "keys="); | |
2982 | ||
2983 | for_each_hist_key_field(i, hist_data) { | |
2984 | key_field = hist_data->fields[i]; | |
2985 | if (!first) | |
2986 | strcat(cmd, ","); | |
2987 | strcat(cmd, key_field->field->name); | |
2988 | first = false; | |
2989 | } | |
2990 | ||
2991 | /* Create the synthetic field variable specification */ | |
2992 | strcat(cmd, ":synthetic_"); | |
2993 | strcat(cmd, field_name); | |
2994 | strcat(cmd, "="); | |
2995 | strcat(cmd, field_name); | |
2996 | ||
2997 | /* Use the same filter as the compatible histogram */ | |
2998 | saved_filter = find_trigger_filter(hist_data, file); | |
2999 | if (saved_filter) { | |
3000 | strcat(cmd, " if "); | |
3001 | strcat(cmd, saved_filter); | |
3002 | } | |
3003 | ||
3004 | var_hist->cmd = kstrdup(cmd, GFP_KERNEL); | |
3005 | if (!var_hist->cmd) { | |
3006 | kfree(cmd); | |
3007 | kfree(var_hist); | |
3008 | return ERR_PTR(-ENOMEM); | |
3009 | } | |
3010 | ||
3011 | /* Save the compatible histogram information */ | |
3012 | var_hist->hist_data = hist_data; | |
3013 | ||
3014 | /* Create the new histogram with our variable */ | |
3015 | ret = event_hist_trigger_func(&trigger_hist_cmd, file, | |
3016 | "", "hist", cmd); | |
3017 | if (ret) { | |
3018 | kfree(cmd); | |
3019 | kfree(var_hist->cmd); | |
3020 | kfree(var_hist); | |
f404da6e TZ |
3021 | hist_err_event("onmatch: Couldn't create histogram for field: ", |
3022 | subsys_name, event_name, field_name); | |
02205a67 TZ |
3023 | return ERR_PTR(ret); |
3024 | } | |
3025 | ||
3026 | kfree(cmd); | |
3027 | ||
3028 | /* If we can't find the variable, something went wrong */ | |
3029 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
3030 | event_name, field_name); | |
3031 | if (IS_ERR_OR_NULL(event_var)) { | |
3032 | kfree(var_hist->cmd); | |
3033 | kfree(var_hist); | |
f404da6e TZ |
3034 | hist_err_event("onmatch: Couldn't find synthetic variable: ", |
3035 | subsys_name, event_name, field_name); | |
02205a67 TZ |
3036 | return ERR_PTR(-EINVAL); |
3037 | } | |
3038 | ||
3039 | n = target_hist_data->n_field_var_hists; | |
3040 | target_hist_data->field_var_hists[n] = var_hist; | |
3041 | target_hist_data->n_field_var_hists++; | |
3042 | ||
3043 | return event_var; | |
3044 | } | |
3045 | ||
c282a386 | 3046 | static struct hist_field * |
02205a67 TZ |
3047 | find_target_event_var(struct hist_trigger_data *hist_data, |
3048 | char *subsys_name, char *event_name, char *var_name) | |
3049 | { | |
3050 | struct trace_event_file *file = hist_data->event_file; | |
3051 | struct hist_field *hist_field = NULL; | |
3052 | ||
3053 | if (subsys_name) { | |
3054 | struct trace_event_call *call; | |
3055 | ||
3056 | if (!event_name) | |
3057 | return NULL; | |
3058 | ||
3059 | call = file->event_call; | |
3060 | ||
3061 | if (strcmp(subsys_name, call->class->system) != 0) | |
3062 | return NULL; | |
3063 | ||
3064 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3065 | return NULL; | |
3066 | } | |
3067 | ||
3068 | hist_field = find_var_field(hist_data, var_name); | |
3069 | ||
3070 | return hist_field; | |
3071 | } | |
3072 | ||
3073 | static inline void __update_field_vars(struct tracing_map_elt *elt, | |
3074 | struct ring_buffer_event *rbe, | |
3075 | void *rec, | |
3076 | struct field_var **field_vars, | |
3077 | unsigned int n_field_vars, | |
3078 | unsigned int field_var_str_start) | |
3079 | { | |
3080 | struct hist_elt_data *elt_data = elt->private_data; | |
3081 | unsigned int i, j, var_idx; | |
3082 | u64 var_val; | |
3083 | ||
3084 | for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { | |
3085 | struct field_var *field_var = field_vars[i]; | |
3086 | struct hist_field *var = field_var->var; | |
3087 | struct hist_field *val = field_var->val; | |
3088 | ||
3089 | var_val = val->fn(val, elt, rbe, rec); | |
3090 | var_idx = var->var.idx; | |
3091 | ||
3092 | if (val->flags & HIST_FIELD_FL_STRING) { | |
3093 | char *str = elt_data->field_var_str[j++]; | |
3094 | char *val_str = (char *)(uintptr_t)var_val; | |
3095 | ||
ad452870 | 3096 | strscpy(str, val_str, STR_VAR_LEN_MAX); |
02205a67 TZ |
3097 | var_val = (u64)(uintptr_t)str; |
3098 | } | |
3099 | tracing_map_set_var(elt, var_idx, var_val); | |
3100 | } | |
3101 | } | |
3102 | ||
3103 | static void update_field_vars(struct hist_trigger_data *hist_data, | |
3104 | struct tracing_map_elt *elt, | |
3105 | struct ring_buffer_event *rbe, | |
3106 | void *rec) | |
3107 | { | |
3108 | __update_field_vars(elt, rbe, rec, hist_data->field_vars, | |
3109 | hist_data->n_field_vars, 0); | |
3110 | } | |
3111 | ||
50450603 TZ |
3112 | static void update_max_vars(struct hist_trigger_data *hist_data, |
3113 | struct tracing_map_elt *elt, | |
3114 | struct ring_buffer_event *rbe, | |
3115 | void *rec) | |
3116 | { | |
3117 | __update_field_vars(elt, rbe, rec, hist_data->max_vars, | |
3118 | hist_data->n_max_vars, hist_data->n_field_var_str); | |
3119 | } | |
3120 | ||
02205a67 TZ |
3121 | static struct hist_field *create_var(struct hist_trigger_data *hist_data, |
3122 | struct trace_event_file *file, | |
3123 | char *name, int size, const char *type) | |
3124 | { | |
3125 | struct hist_field *var; | |
3126 | int idx; | |
3127 | ||
3128 | if (find_var(hist_data, file, name) && !hist_data->remove) { | |
3129 | var = ERR_PTR(-EINVAL); | |
3130 | goto out; | |
3131 | } | |
3132 | ||
3133 | var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
3134 | if (!var) { | |
3135 | var = ERR_PTR(-ENOMEM); | |
3136 | goto out; | |
3137 | } | |
3138 | ||
3139 | idx = tracing_map_add_var(hist_data->map); | |
3140 | if (idx < 0) { | |
3141 | kfree(var); | |
3142 | var = ERR_PTR(-EINVAL); | |
3143 | goto out; | |
3144 | } | |
3145 | ||
3146 | var->flags = HIST_FIELD_FL_VAR; | |
3147 | var->var.idx = idx; | |
3148 | var->var.hist_data = var->hist_data = hist_data; | |
3149 | var->size = size; | |
3150 | var->var.name = kstrdup(name, GFP_KERNEL); | |
3151 | var->type = kstrdup(type, GFP_KERNEL); | |
3152 | if (!var->var.name || !var->type) { | |
3153 | kfree(var->var.name); | |
3154 | kfree(var->type); | |
3155 | kfree(var); | |
3156 | var = ERR_PTR(-ENOMEM); | |
3157 | } | |
3158 | out: | |
3159 | return var; | |
3160 | } | |
3161 | ||
3162 | static struct field_var *create_field_var(struct hist_trigger_data *hist_data, | |
3163 | struct trace_event_file *file, | |
3164 | char *field_name) | |
3165 | { | |
3166 | struct hist_field *val = NULL, *var = NULL; | |
3167 | unsigned long flags = HIST_FIELD_FL_VAR; | |
3168 | struct field_var *field_var; | |
3169 | int ret = 0; | |
3170 | ||
3171 | if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { | |
f404da6e | 3172 | hist_err("Too many field variables defined: ", field_name); |
02205a67 TZ |
3173 | ret = -EINVAL; |
3174 | goto err; | |
3175 | } | |
3176 | ||
3177 | val = parse_atom(hist_data, file, field_name, &flags, NULL); | |
3178 | if (IS_ERR(val)) { | |
f404da6e | 3179 | hist_err("Couldn't parse field variable: ", field_name); |
02205a67 TZ |
3180 | ret = PTR_ERR(val); |
3181 | goto err; | |
3182 | } | |
3183 | ||
3184 | var = create_var(hist_data, file, field_name, val->size, val->type); | |
3185 | if (IS_ERR(var)) { | |
f404da6e | 3186 | hist_err("Couldn't create or find variable: ", field_name); |
02205a67 TZ |
3187 | kfree(val); |
3188 | ret = PTR_ERR(var); | |
3189 | goto err; | |
3190 | } | |
3191 | ||
3192 | field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); | |
3193 | if (!field_var) { | |
3194 | kfree(val); | |
3195 | kfree(var); | |
3196 | ret = -ENOMEM; | |
3197 | goto err; | |
3198 | } | |
3199 | ||
3200 | field_var->var = var; | |
3201 | field_var->val = val; | |
3202 | out: | |
3203 | return field_var; | |
3204 | err: | |
3205 | field_var = ERR_PTR(ret); | |
3206 | goto out; | |
3207 | } | |
3208 | ||
3209 | /** | |
3210 | * create_target_field_var - Automatically create a variable for a field | |
3211 | * @target_hist_data: The target hist trigger | |
3212 | * @subsys_name: Optional subsystem name | |
3213 | * @event_name: Optional event name | |
3214 | * @var_name: The name of the field (and the resulting variable) | |
3215 | * | |
3216 | * Hist trigger actions fetch data from variables, not directly from | |
3217 | * events. However, for convenience, users are allowed to directly | |
3218 | * specify an event field in an action, which will be automatically | |
3219 | * converted into a variable on their behalf. | |
3220 | ||
3221 | * This function creates a field variable with the name var_name on | |
3222 | * the hist trigger currently being defined on the target event. If | |
3223 | * subsys_name and event_name are specified, this function simply | |
3224 | * verifies that they do in fact match the target event subsystem and | |
3225 | * event name. | |
3226 | * | |
3227 | * Return: The variable created for the field. | |
3228 | */ | |
c282a386 | 3229 | static struct field_var * |
02205a67 TZ |
3230 | create_target_field_var(struct hist_trigger_data *target_hist_data, |
3231 | char *subsys_name, char *event_name, char *var_name) | |
3232 | { | |
3233 | struct trace_event_file *file = target_hist_data->event_file; | |
3234 | ||
3235 | if (subsys_name) { | |
3236 | struct trace_event_call *call; | |
3237 | ||
3238 | if (!event_name) | |
3239 | return NULL; | |
3240 | ||
3241 | call = file->event_call; | |
3242 | ||
3243 | if (strcmp(subsys_name, call->class->system) != 0) | |
3244 | return NULL; | |
3245 | ||
3246 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3247 | return NULL; | |
3248 | } | |
3249 | ||
3250 | return create_field_var(target_hist_data, file, var_name); | |
3251 | } | |
3252 | ||
50450603 TZ |
3253 | static void onmax_print(struct seq_file *m, |
3254 | struct hist_trigger_data *hist_data, | |
3255 | struct tracing_map_elt *elt, | |
3256 | struct action_data *data) | |
3257 | { | |
3258 | unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx; | |
3259 | ||
3260 | seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx)); | |
3261 | ||
3262 | for (i = 0; i < hist_data->n_max_vars; i++) { | |
3263 | struct hist_field *save_val = hist_data->max_vars[i]->val; | |
3264 | struct hist_field *save_var = hist_data->max_vars[i]->var; | |
3265 | u64 val; | |
3266 | ||
3267 | save_var_idx = save_var->var.idx; | |
3268 | ||
3269 | val = tracing_map_read_var(elt, save_var_idx); | |
3270 | ||
3271 | if (save_val->flags & HIST_FIELD_FL_STRING) { | |
3272 | seq_printf(m, " %s: %-32s", save_var->var.name, | |
3273 | (char *)(uintptr_t)(val)); | |
3274 | } else | |
3275 | seq_printf(m, " %s: %10llu", save_var->var.name, val); | |
3276 | } | |
3277 | } | |
3278 | ||
3279 | static void onmax_save(struct hist_trigger_data *hist_data, | |
3280 | struct tracing_map_elt *elt, void *rec, | |
3281 | struct ring_buffer_event *rbe, | |
3282 | struct action_data *data, u64 *var_ref_vals) | |
3283 | { | |
3284 | unsigned int max_idx = data->onmax.max_var->var.idx; | |
3285 | unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx; | |
3286 | ||
3287 | u64 var_val, max_val; | |
3288 | ||
3289 | var_val = var_ref_vals[max_var_ref_idx]; | |
3290 | max_val = tracing_map_read_var(elt, max_idx); | |
3291 | ||
3292 | if (var_val <= max_val) | |
3293 | return; | |
3294 | ||
3295 | tracing_map_set_var(elt, max_idx, var_val); | |
3296 | ||
3297 | update_max_vars(hist_data, elt, rbe, rec); | |
3298 | } | |
3299 | ||
3300 | static void onmax_destroy(struct action_data *data) | |
3301 | { | |
3302 | unsigned int i; | |
3303 | ||
3304 | destroy_hist_field(data->onmax.max_var, 0); | |
3305 | destroy_hist_field(data->onmax.var, 0); | |
3306 | ||
3307 | kfree(data->onmax.var_str); | |
3308 | kfree(data->onmax.fn_name); | |
3309 | ||
3310 | for (i = 0; i < data->n_params; i++) | |
3311 | kfree(data->params[i]); | |
3312 | ||
3313 | kfree(data); | |
3314 | } | |
3315 | ||
3316 | static int onmax_create(struct hist_trigger_data *hist_data, | |
3317 | struct action_data *data) | |
3318 | { | |
3319 | struct trace_event_file *file = hist_data->event_file; | |
3320 | struct hist_field *var_field, *ref_field, *max_var; | |
3321 | unsigned int var_ref_idx = hist_data->n_var_refs; | |
3322 | struct field_var *field_var; | |
3323 | char *onmax_var_str, *param; | |
3324 | unsigned long flags; | |
3325 | unsigned int i; | |
3326 | int ret = 0; | |
3327 | ||
3328 | onmax_var_str = data->onmax.var_str; | |
f404da6e TZ |
3329 | if (onmax_var_str[0] != '$') { |
3330 | hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str); | |
50450603 | 3331 | return -EINVAL; |
f404da6e | 3332 | } |
50450603 TZ |
3333 | onmax_var_str++; |
3334 | ||
3335 | var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str); | |
f404da6e TZ |
3336 | if (!var_field) { |
3337 | hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str); | |
50450603 | 3338 | return -EINVAL; |
f404da6e | 3339 | } |
50450603 TZ |
3340 | |
3341 | flags = HIST_FIELD_FL_VAR_REF; | |
3342 | ref_field = create_hist_field(hist_data, NULL, flags, NULL); | |
3343 | if (!ref_field) | |
3344 | return -ENOMEM; | |
3345 | ||
3346 | if (init_var_ref(ref_field, var_field, NULL, NULL)) { | |
3347 | destroy_hist_field(ref_field, 0); | |
3348 | ret = -ENOMEM; | |
3349 | goto out; | |
3350 | } | |
3351 | hist_data->var_refs[hist_data->n_var_refs] = ref_field; | |
3352 | ref_field->var_ref_idx = hist_data->n_var_refs++; | |
3353 | data->onmax.var = ref_field; | |
3354 | ||
3355 | data->fn = onmax_save; | |
3356 | data->onmax.max_var_ref_idx = var_ref_idx; | |
3357 | max_var = create_var(hist_data, file, "max", sizeof(u64), "u64"); | |
3358 | if (IS_ERR(max_var)) { | |
f404da6e | 3359 | hist_err("onmax: Couldn't create onmax variable: ", "max"); |
50450603 TZ |
3360 | ret = PTR_ERR(max_var); |
3361 | goto out; | |
3362 | } | |
3363 | data->onmax.max_var = max_var; | |
3364 | ||
3365 | for (i = 0; i < data->n_params; i++) { | |
3366 | param = kstrdup(data->params[i], GFP_KERNEL); | |
3367 | if (!param) { | |
3368 | ret = -ENOMEM; | |
3369 | goto out; | |
3370 | } | |
3371 | ||
3372 | field_var = create_target_field_var(hist_data, NULL, NULL, param); | |
3373 | if (IS_ERR(field_var)) { | |
f404da6e | 3374 | hist_err("onmax: Couldn't create field variable: ", param); |
50450603 TZ |
3375 | ret = PTR_ERR(field_var); |
3376 | kfree(param); | |
3377 | goto out; | |
3378 | } | |
3379 | ||
3380 | hist_data->max_vars[hist_data->n_max_vars++] = field_var; | |
3381 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
3382 | hist_data->n_max_var_str++; | |
3383 | ||
3384 | kfree(param); | |
3385 | } | |
3386 | out: | |
3387 | return ret; | |
3388 | } | |
3389 | ||
3390 | static int parse_action_params(char *params, struct action_data *data) | |
3391 | { | |
3392 | char *param, *saved_param; | |
3393 | int ret = 0; | |
3394 | ||
3395 | while (params) { | |
3396 | if (data->n_params >= SYNTH_FIELDS_MAX) | |
3397 | goto out; | |
3398 | ||
3399 | param = strsep(¶ms, ","); | |
3400 | if (!param) { | |
3401 | ret = -EINVAL; | |
3402 | goto out; | |
3403 | } | |
3404 | ||
3405 | param = strstrip(param); | |
3406 | if (strlen(param) < 2) { | |
f404da6e | 3407 | hist_err("Invalid action param: ", param); |
50450603 TZ |
3408 | ret = -EINVAL; |
3409 | goto out; | |
3410 | } | |
3411 | ||
3412 | saved_param = kstrdup(param, GFP_KERNEL); | |
3413 | if (!saved_param) { | |
3414 | ret = -ENOMEM; | |
3415 | goto out; | |
3416 | } | |
3417 | ||
3418 | data->params[data->n_params++] = saved_param; | |
3419 | } | |
3420 | out: | |
3421 | return ret; | |
3422 | } | |
3423 | ||
3424 | static struct action_data *onmax_parse(char *str) | |
3425 | { | |
3426 | char *onmax_fn_name, *onmax_var_str; | |
3427 | struct action_data *data; | |
3428 | int ret = -EINVAL; | |
3429 | ||
3430 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
3431 | if (!data) | |
3432 | return ERR_PTR(-ENOMEM); | |
3433 | ||
3434 | onmax_var_str = strsep(&str, ")"); | |
3435 | if (!onmax_var_str || !str) { | |
3436 | ret = -EINVAL; | |
3437 | goto free; | |
3438 | } | |
3439 | ||
3440 | data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL); | |
3441 | if (!data->onmax.var_str) { | |
3442 | ret = -ENOMEM; | |
3443 | goto free; | |
3444 | } | |
3445 | ||
3446 | strsep(&str, "."); | |
3447 | if (!str) | |
3448 | goto free; | |
3449 | ||
3450 | onmax_fn_name = strsep(&str, "("); | |
3451 | if (!onmax_fn_name || !str) | |
3452 | goto free; | |
3453 | ||
3454 | if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) { | |
3455 | char *params = strsep(&str, ")"); | |
3456 | ||
3457 | if (!params) { | |
3458 | ret = -EINVAL; | |
3459 | goto free; | |
3460 | } | |
3461 | ||
3462 | ret = parse_action_params(params, data); | |
3463 | if (ret) | |
3464 | goto free; | |
3465 | } else | |
3466 | goto free; | |
3467 | ||
3468 | data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL); | |
3469 | if (!data->onmax.fn_name) { | |
3470 | ret = -ENOMEM; | |
3471 | goto free; | |
3472 | } | |
3473 | out: | |
3474 | return data; | |
3475 | free: | |
3476 | onmax_destroy(data); | |
3477 | data = ERR_PTR(ret); | |
3478 | goto out; | |
3479 | } | |
3480 | ||
c282a386 TZ |
3481 | static void onmatch_destroy(struct action_data *data) |
3482 | { | |
3483 | unsigned int i; | |
3484 | ||
3485 | mutex_lock(&synth_event_mutex); | |
3486 | ||
3487 | kfree(data->onmatch.match_event); | |
3488 | kfree(data->onmatch.match_event_system); | |
3489 | kfree(data->onmatch.synth_event_name); | |
3490 | ||
3491 | for (i = 0; i < data->n_params; i++) | |
3492 | kfree(data->params[i]); | |
3493 | ||
3494 | if (data->onmatch.synth_event) | |
3495 | data->onmatch.synth_event->ref--; | |
3496 | ||
3497 | kfree(data); | |
3498 | ||
3499 | mutex_unlock(&synth_event_mutex); | |
3500 | } | |
3501 | ||
02205a67 TZ |
3502 | static void destroy_field_var(struct field_var *field_var) |
3503 | { | |
3504 | if (!field_var) | |
3505 | return; | |
3506 | ||
3507 | destroy_hist_field(field_var->var, 0); | |
3508 | destroy_hist_field(field_var->val, 0); | |
3509 | ||
3510 | kfree(field_var); | |
3511 | } | |
3512 | ||
3513 | static void destroy_field_vars(struct hist_trigger_data *hist_data) | |
3514 | { | |
3515 | unsigned int i; | |
3516 | ||
3517 | for (i = 0; i < hist_data->n_field_vars; i++) | |
3518 | destroy_field_var(hist_data->field_vars[i]); | |
3519 | } | |
3520 | ||
c282a386 TZ |
3521 | static void save_field_var(struct hist_trigger_data *hist_data, |
3522 | struct field_var *field_var) | |
02205a67 TZ |
3523 | { |
3524 | hist_data->field_vars[hist_data->n_field_vars++] = field_var; | |
3525 | ||
3526 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
3527 | hist_data->n_field_var_str++; | |
3528 | } | |
3529 | ||
c282a386 TZ |
3530 | |
3531 | static void destroy_synth_var_refs(struct hist_trigger_data *hist_data) | |
3532 | { | |
3533 | unsigned int i; | |
3534 | ||
3535 | for (i = 0; i < hist_data->n_synth_var_refs; i++) | |
3536 | destroy_hist_field(hist_data->synth_var_refs[i], 0); | |
3537 | } | |
3538 | ||
3539 | static void save_synth_var_ref(struct hist_trigger_data *hist_data, | |
3540 | struct hist_field *var_ref) | |
3541 | { | |
3542 | hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref; | |
3543 | ||
3544 | hist_data->var_refs[hist_data->n_var_refs] = var_ref; | |
3545 | var_ref->var_ref_idx = hist_data->n_var_refs++; | |
3546 | } | |
3547 | ||
3548 | static int check_synth_field(struct synth_event *event, | |
3549 | struct hist_field *hist_field, | |
3550 | unsigned int field_pos) | |
3551 | { | |
3552 | struct synth_field *field; | |
3553 | ||
3554 | if (field_pos >= event->n_fields) | |
3555 | return -EINVAL; | |
3556 | ||
3557 | field = event->fields[field_pos]; | |
3558 | ||
3559 | if (strcmp(field->type, hist_field->type) != 0) | |
3560 | return -EINVAL; | |
3561 | ||
3562 | return 0; | |
3563 | } | |
3564 | ||
c282a386 TZ |
3565 | static struct hist_field * |
3566 | onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, | |
3567 | char *system, char *event, char *var) | |
3568 | { | |
3569 | struct hist_field *hist_field; | |
3570 | ||
3571 | var++; /* skip '$' */ | |
3572 | ||
3573 | hist_field = find_target_event_var(hist_data, system, event, var); | |
3574 | if (!hist_field) { | |
3575 | if (!system) { | |
3576 | system = data->onmatch.match_event_system; | |
3577 | event = data->onmatch.match_event; | |
3578 | } | |
3579 | ||
3580 | hist_field = find_event_var(hist_data, system, event, var); | |
3581 | } | |
3582 | ||
f404da6e TZ |
3583 | if (!hist_field) |
3584 | hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var); | |
3585 | ||
c282a386 TZ |
3586 | return hist_field; |
3587 | } | |
3588 | ||
3589 | static struct hist_field * | |
3590 | onmatch_create_field_var(struct hist_trigger_data *hist_data, | |
3591 | struct action_data *data, char *system, | |
3592 | char *event, char *var) | |
3593 | { | |
3594 | struct hist_field *hist_field = NULL; | |
3595 | struct field_var *field_var; | |
3596 | ||
3597 | /* | |
3598 | * First try to create a field var on the target event (the | |
3599 | * currently being defined). This will create a variable for | |
3600 | * unqualified fields on the target event, or if qualified, | |
3601 | * target fields that have qualified names matching the target. | |
3602 | */ | |
3603 | field_var = create_target_field_var(hist_data, system, event, var); | |
3604 | ||
3605 | if (field_var && !IS_ERR(field_var)) { | |
3606 | save_field_var(hist_data, field_var); | |
3607 | hist_field = field_var->var; | |
3608 | } else { | |
3609 | field_var = NULL; | |
3610 | /* | |
3611 | * If no explicit system.event is specfied, default to | |
3612 | * looking for fields on the onmatch(system.event.xxx) | |
3613 | * event. | |
3614 | */ | |
3615 | if (!system) { | |
3616 | system = data->onmatch.match_event_system; | |
3617 | event = data->onmatch.match_event; | |
3618 | } | |
3619 | ||
3620 | /* | |
3621 | * At this point, we're looking at a field on another | |
3622 | * event. Because we can't modify a hist trigger on | |
3623 | * another event to add a variable for a field, we need | |
3624 | * to create a new trigger on that event and create the | |
3625 | * variable at the same time. | |
3626 | */ | |
3627 | hist_field = create_field_var_hist(hist_data, system, event, var); | |
3628 | if (IS_ERR(hist_field)) | |
3629 | goto free; | |
3630 | } | |
3631 | out: | |
3632 | return hist_field; | |
3633 | free: | |
3634 | destroy_field_var(field_var); | |
3635 | hist_field = NULL; | |
3636 | goto out; | |
3637 | } | |
3638 | ||
3639 | static int onmatch_create(struct hist_trigger_data *hist_data, | |
3640 | struct trace_event_file *file, | |
3641 | struct action_data *data) | |
3642 | { | |
3643 | char *event_name, *param, *system = NULL; | |
3644 | struct hist_field *hist_field, *var_ref; | |
3645 | unsigned int i, var_ref_idx; | |
3646 | unsigned int field_pos = 0; | |
3647 | struct synth_event *event; | |
3648 | int ret = 0; | |
3649 | ||
3650 | mutex_lock(&synth_event_mutex); | |
3651 | event = find_synth_event(data->onmatch.synth_event_name); | |
3652 | if (!event) { | |
f404da6e | 3653 | hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name); |
c282a386 TZ |
3654 | mutex_unlock(&synth_event_mutex); |
3655 | return -EINVAL; | |
3656 | } | |
3657 | event->ref++; | |
3658 | mutex_unlock(&synth_event_mutex); | |
3659 | ||
3660 | var_ref_idx = hist_data->n_var_refs; | |
3661 | ||
3662 | for (i = 0; i < data->n_params; i++) { | |
3663 | char *p; | |
3664 | ||
3665 | p = param = kstrdup(data->params[i], GFP_KERNEL); | |
3666 | if (!param) { | |
3667 | ret = -ENOMEM; | |
3668 | goto err; | |
3669 | } | |
3670 | ||
3671 | system = strsep(¶m, "."); | |
3672 | if (!param) { | |
3673 | param = (char *)system; | |
3674 | system = event_name = NULL; | |
3675 | } else { | |
3676 | event_name = strsep(¶m, "."); | |
3677 | if (!param) { | |
3678 | kfree(p); | |
3679 | ret = -EINVAL; | |
3680 | goto err; | |
3681 | } | |
3682 | } | |
3683 | ||
3684 | if (param[0] == '$') | |
3685 | hist_field = onmatch_find_var(hist_data, data, system, | |
3686 | event_name, param); | |
3687 | else | |
3688 | hist_field = onmatch_create_field_var(hist_data, data, | |
3689 | system, | |
3690 | event_name, | |
3691 | param); | |
3692 | ||
3693 | if (!hist_field) { | |
3694 | kfree(p); | |
3695 | ret = -EINVAL; | |
3696 | goto err; | |
3697 | } | |
3698 | ||
3699 | if (check_synth_field(event, hist_field, field_pos) == 0) { | |
3700 | var_ref = create_var_ref(hist_field, system, event_name); | |
3701 | if (!var_ref) { | |
3702 | kfree(p); | |
3703 | ret = -ENOMEM; | |
3704 | goto err; | |
3705 | } | |
3706 | ||
3707 | save_synth_var_ref(hist_data, var_ref); | |
3708 | field_pos++; | |
3709 | kfree(p); | |
3710 | continue; | |
3711 | } | |
3712 | ||
f404da6e TZ |
3713 | hist_err_event("onmatch: Param type doesn't match synthetic event field type: ", |
3714 | system, event_name, param); | |
c282a386 TZ |
3715 | kfree(p); |
3716 | ret = -EINVAL; | |
3717 | goto err; | |
3718 | } | |
3719 | ||
3720 | if (field_pos != event->n_fields) { | |
f404da6e | 3721 | hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name); |
c282a386 TZ |
3722 | ret = -EINVAL; |
3723 | goto err; | |
3724 | } | |
3725 | ||
3726 | data->fn = action_trace; | |
3727 | data->onmatch.synth_event = event; | |
3728 | data->onmatch.var_ref_idx = var_ref_idx; | |
3729 | out: | |
3730 | return ret; | |
3731 | err: | |
3732 | mutex_lock(&synth_event_mutex); | |
3733 | event->ref--; | |
3734 | mutex_unlock(&synth_event_mutex); | |
3735 | ||
3736 | goto out; | |
3737 | } | |
3738 | ||
3739 | static struct action_data *onmatch_parse(struct trace_array *tr, char *str) | |
3740 | { | |
3741 | char *match_event, *match_event_system; | |
3742 | char *synth_event_name, *params; | |
3743 | struct action_data *data; | |
3744 | int ret = -EINVAL; | |
3745 | ||
3746 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
3747 | if (!data) | |
3748 | return ERR_PTR(-ENOMEM); | |
3749 | ||
3750 | match_event = strsep(&str, ")"); | |
f404da6e TZ |
3751 | if (!match_event || !str) { |
3752 | hist_err("onmatch: Missing closing paren: ", match_event); | |
c282a386 | 3753 | goto free; |
f404da6e | 3754 | } |
c282a386 TZ |
3755 | |
3756 | match_event_system = strsep(&match_event, "."); | |
f404da6e TZ |
3757 | if (!match_event) { |
3758 | hist_err("onmatch: Missing subsystem for match event: ", match_event_system); | |
c282a386 | 3759 | goto free; |
f404da6e | 3760 | } |
c282a386 | 3761 | |
f404da6e TZ |
3762 | if (IS_ERR(event_file(tr, match_event_system, match_event))) { |
3763 | hist_err_event("onmatch: Invalid subsystem or event name: ", | |
3764 | match_event_system, match_event, NULL); | |
c282a386 | 3765 | goto free; |
f404da6e | 3766 | } |
c282a386 TZ |
3767 | |
3768 | data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL); | |
3769 | if (!data->onmatch.match_event) { | |
3770 | ret = -ENOMEM; | |
3771 | goto free; | |
3772 | } | |
3773 | ||
3774 | data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL); | |
3775 | if (!data->onmatch.match_event_system) { | |
3776 | ret = -ENOMEM; | |
3777 | goto free; | |
3778 | } | |
3779 | ||
3780 | strsep(&str, "."); | |
f404da6e TZ |
3781 | if (!str) { |
3782 | hist_err("onmatch: Missing . after onmatch(): ", str); | |
c282a386 | 3783 | goto free; |
f404da6e | 3784 | } |
c282a386 TZ |
3785 | |
3786 | synth_event_name = strsep(&str, "("); | |
f404da6e TZ |
3787 | if (!synth_event_name || !str) { |
3788 | hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name); | |
c282a386 | 3789 | goto free; |
f404da6e | 3790 | } |
c282a386 TZ |
3791 | |
3792 | data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL); | |
3793 | if (!data->onmatch.synth_event_name) { | |
3794 | ret = -ENOMEM; | |
3795 | goto free; | |
3796 | } | |
3797 | ||
3798 | params = strsep(&str, ")"); | |
f404da6e TZ |
3799 | if (!params || !str || (str && strlen(str))) { |
3800 | hist_err("onmatch: Missing closing paramlist paren: ", params); | |
c282a386 | 3801 | goto free; |
f404da6e | 3802 | } |
c282a386 TZ |
3803 | |
3804 | ret = parse_action_params(params, data); | |
3805 | if (ret) | |
3806 | goto free; | |
3807 | out: | |
3808 | return data; | |
3809 | free: | |
3810 | onmatch_destroy(data); | |
3811 | data = ERR_PTR(ret); | |
3812 | goto out; | |
3813 | } | |
3814 | ||
7ef224d1 TZ |
3815 | static int create_hitcount_val(struct hist_trigger_data *hist_data) |
3816 | { | |
3817 | hist_data->fields[HITCOUNT_IDX] = | |
30350d65 | 3818 | create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); |
7ef224d1 TZ |
3819 | if (!hist_data->fields[HITCOUNT_IDX]) |
3820 | return -ENOMEM; | |
3821 | ||
3822 | hist_data->n_vals++; | |
30350d65 | 3823 | hist_data->n_fields++; |
7ef224d1 TZ |
3824 | |
3825 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) | |
3826 | return -EINVAL; | |
3827 | ||
3828 | return 0; | |
3829 | } | |
3830 | ||
30350d65 TZ |
3831 | static int __create_val_field(struct hist_trigger_data *hist_data, |
3832 | unsigned int val_idx, | |
3833 | struct trace_event_file *file, | |
3834 | char *var_name, char *field_str, | |
3835 | unsigned long flags) | |
f2606835 | 3836 | { |
100719dc | 3837 | struct hist_field *hist_field; |
f2606835 TZ |
3838 | int ret = 0; |
3839 | ||
100719dc TZ |
3840 | hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0); |
3841 | if (IS_ERR(hist_field)) { | |
3842 | ret = PTR_ERR(hist_field); | |
f2606835 TZ |
3843 | goto out; |
3844 | } | |
3845 | ||
100719dc TZ |
3846 | hist_data->fields[val_idx] = hist_field; |
3847 | ||
f2606835 | 3848 | ++hist_data->n_vals; |
30350d65 | 3849 | ++hist_data->n_fields; |
f2606835 | 3850 | |
30350d65 | 3851 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) |
f2606835 TZ |
3852 | ret = -EINVAL; |
3853 | out: | |
3854 | return ret; | |
3855 | } | |
3856 | ||
30350d65 TZ |
3857 | static int create_val_field(struct hist_trigger_data *hist_data, |
3858 | unsigned int val_idx, | |
3859 | struct trace_event_file *file, | |
3860 | char *field_str) | |
3861 | { | |
3862 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) | |
3863 | return -EINVAL; | |
3864 | ||
3865 | return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); | |
3866 | } | |
3867 | ||
3868 | static int create_var_field(struct hist_trigger_data *hist_data, | |
3869 | unsigned int val_idx, | |
3870 | struct trace_event_file *file, | |
3871 | char *var_name, char *expr_str) | |
3872 | { | |
3873 | unsigned long flags = 0; | |
3874 | ||
3875 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) | |
3876 | return -EINVAL; | |
f404da6e | 3877 | |
30350d65 | 3878 | if (find_var(hist_data, file, var_name) && !hist_data->remove) { |
f404da6e | 3879 | hist_err("Variable already defined: ", var_name); |
30350d65 TZ |
3880 | return -EINVAL; |
3881 | } | |
3882 | ||
3883 | flags |= HIST_FIELD_FL_VAR; | |
3884 | hist_data->n_vars++; | |
3885 | if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) | |
3886 | return -EINVAL; | |
3887 | ||
3888 | return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); | |
3889 | } | |
3890 | ||
7ef224d1 TZ |
3891 | static int create_val_fields(struct hist_trigger_data *hist_data, |
3892 | struct trace_event_file *file) | |
3893 | { | |
f2606835 | 3894 | char *fields_str, *field_str; |
30350d65 | 3895 | unsigned int i, j = 1; |
7ef224d1 TZ |
3896 | int ret; |
3897 | ||
3898 | ret = create_hitcount_val(hist_data); | |
f2606835 TZ |
3899 | if (ret) |
3900 | goto out; | |
7ef224d1 | 3901 | |
f2606835 TZ |
3902 | fields_str = hist_data->attrs->vals_str; |
3903 | if (!fields_str) | |
3904 | goto out; | |
3905 | ||
3906 | strsep(&fields_str, "="); | |
3907 | if (!fields_str) | |
3908 | goto out; | |
3909 | ||
3910 | for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && | |
3911 | j < TRACING_MAP_VALS_MAX; i++) { | |
3912 | field_str = strsep(&fields_str, ","); | |
3913 | if (!field_str) | |
3914 | break; | |
30350d65 | 3915 | |
f2606835 TZ |
3916 | if (strcmp(field_str, "hitcount") == 0) |
3917 | continue; | |
30350d65 | 3918 | |
f2606835 TZ |
3919 | ret = create_val_field(hist_data, j++, file, field_str); |
3920 | if (ret) | |
3921 | goto out; | |
3922 | } | |
30350d65 | 3923 | |
f2606835 TZ |
3924 | if (fields_str && (strcmp(fields_str, "hitcount") != 0)) |
3925 | ret = -EINVAL; | |
3926 | out: | |
7ef224d1 TZ |
3927 | return ret; |
3928 | } | |
3929 | ||
3930 | static int create_key_field(struct hist_trigger_data *hist_data, | |
3931 | unsigned int key_idx, | |
76a3b0c8 | 3932 | unsigned int key_offset, |
7ef224d1 TZ |
3933 | struct trace_event_file *file, |
3934 | char *field_str) | |
3935 | { | |
30350d65 | 3936 | struct hist_field *hist_field = NULL; |
100719dc | 3937 | |
7ef224d1 TZ |
3938 | unsigned long flags = 0; |
3939 | unsigned int key_size; | |
3940 | int ret = 0; | |
3941 | ||
30350d65 | 3942 | if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) |
7ef224d1 TZ |
3943 | return -EINVAL; |
3944 | ||
3945 | flags |= HIST_FIELD_FL_KEY; | |
3946 | ||
69a0200c TZ |
3947 | if (strcmp(field_str, "stacktrace") == 0) { |
3948 | flags |= HIST_FIELD_FL_STACKTRACE; | |
3949 | key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; | |
30350d65 | 3950 | hist_field = create_hist_field(hist_data, NULL, flags, NULL); |
69a0200c | 3951 | } else { |
100719dc TZ |
3952 | hist_field = parse_expr(hist_data, file, field_str, flags, |
3953 | NULL, 0); | |
3954 | if (IS_ERR(hist_field)) { | |
3955 | ret = PTR_ERR(hist_field); | |
3956 | goto out; | |
69a0200c TZ |
3957 | } |
3958 | ||
067fe038 | 3959 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF) { |
f404da6e | 3960 | hist_err("Using variable references as keys not supported: ", field_str); |
067fe038 TZ |
3961 | destroy_hist_field(hist_field, 0); |
3962 | ret = -EINVAL; | |
3963 | goto out; | |
3964 | } | |
3965 | ||
100719dc | 3966 | key_size = hist_field->size; |
7ef224d1 TZ |
3967 | } |
3968 | ||
100719dc | 3969 | hist_data->fields[key_idx] = hist_field; |
7ef224d1 TZ |
3970 | |
3971 | key_size = ALIGN(key_size, sizeof(u64)); | |
3972 | hist_data->fields[key_idx]->size = key_size; | |
76a3b0c8 | 3973 | hist_data->fields[key_idx]->offset = key_offset; |
100719dc | 3974 | |
76a3b0c8 | 3975 | hist_data->key_size += key_size; |
100719dc | 3976 | |
7ef224d1 TZ |
3977 | if (hist_data->key_size > HIST_KEY_SIZE_MAX) { |
3978 | ret = -EINVAL; | |
3979 | goto out; | |
3980 | } | |
3981 | ||
3982 | hist_data->n_keys++; | |
30350d65 | 3983 | hist_data->n_fields++; |
7ef224d1 TZ |
3984 | |
3985 | if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) | |
3986 | return -EINVAL; | |
3987 | ||
3988 | ret = key_size; | |
3989 | out: | |
3990 | return ret; | |
3991 | } | |
3992 | ||
3993 | static int create_key_fields(struct hist_trigger_data *hist_data, | |
3994 | struct trace_event_file *file) | |
3995 | { | |
76a3b0c8 | 3996 | unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; |
7ef224d1 TZ |
3997 | char *fields_str, *field_str; |
3998 | int ret = -EINVAL; | |
3999 | ||
4000 | fields_str = hist_data->attrs->keys_str; | |
4001 | if (!fields_str) | |
4002 | goto out; | |
4003 | ||
4004 | strsep(&fields_str, "="); | |
4005 | if (!fields_str) | |
4006 | goto out; | |
4007 | ||
76a3b0c8 | 4008 | for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { |
7ef224d1 TZ |
4009 | field_str = strsep(&fields_str, ","); |
4010 | if (!field_str) | |
4011 | break; | |
76a3b0c8 TZ |
4012 | ret = create_key_field(hist_data, i, key_offset, |
4013 | file, field_str); | |
7ef224d1 TZ |
4014 | if (ret < 0) |
4015 | goto out; | |
76a3b0c8 | 4016 | key_offset += ret; |
7ef224d1 TZ |
4017 | } |
4018 | if (fields_str) { | |
4019 | ret = -EINVAL; | |
4020 | goto out; | |
4021 | } | |
4022 | ret = 0; | |
4023 | out: | |
4024 | return ret; | |
4025 | } | |
4026 | ||
30350d65 TZ |
4027 | static int create_var_fields(struct hist_trigger_data *hist_data, |
4028 | struct trace_event_file *file) | |
4029 | { | |
4030 | unsigned int i, j = hist_data->n_vals; | |
4031 | int ret = 0; | |
4032 | ||
4033 | unsigned int n_vars = hist_data->attrs->var_defs.n_vars; | |
4034 | ||
4035 | for (i = 0; i < n_vars; i++) { | |
4036 | char *var_name = hist_data->attrs->var_defs.name[i]; | |
4037 | char *expr = hist_data->attrs->var_defs.expr[i]; | |
4038 | ||
4039 | ret = create_var_field(hist_data, j++, file, var_name, expr); | |
4040 | if (ret) | |
4041 | goto out; | |
4042 | } | |
4043 | out: | |
4044 | return ret; | |
4045 | } | |
4046 | ||
4047 | static void free_var_defs(struct hist_trigger_data *hist_data) | |
4048 | { | |
4049 | unsigned int i; | |
4050 | ||
4051 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { | |
4052 | kfree(hist_data->attrs->var_defs.name[i]); | |
4053 | kfree(hist_data->attrs->var_defs.expr[i]); | |
4054 | } | |
4055 | ||
4056 | hist_data->attrs->var_defs.n_vars = 0; | |
4057 | } | |
4058 | ||
4059 | static int parse_var_defs(struct hist_trigger_data *hist_data) | |
4060 | { | |
4061 | char *s, *str, *var_name, *field_str; | |
4062 | unsigned int i, j, n_vars = 0; | |
4063 | int ret = 0; | |
4064 | ||
4065 | for (i = 0; i < hist_data->attrs->n_assignments; i++) { | |
4066 | str = hist_data->attrs->assignment_str[i]; | |
4067 | for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { | |
4068 | field_str = strsep(&str, ","); | |
4069 | if (!field_str) | |
4070 | break; | |
4071 | ||
4072 | var_name = strsep(&field_str, "="); | |
4073 | if (!var_name || !field_str) { | |
f404da6e | 4074 | hist_err("Malformed assignment: ", var_name); |
30350d65 TZ |
4075 | ret = -EINVAL; |
4076 | goto free; | |
4077 | } | |
4078 | ||
4079 | if (n_vars == TRACING_MAP_VARS_MAX) { | |
f404da6e | 4080 | hist_err("Too many variables defined: ", var_name); |
30350d65 TZ |
4081 | ret = -EINVAL; |
4082 | goto free; | |
4083 | } | |
4084 | ||
4085 | s = kstrdup(var_name, GFP_KERNEL); | |
4086 | if (!s) { | |
4087 | ret = -ENOMEM; | |
4088 | goto free; | |
4089 | } | |
4090 | hist_data->attrs->var_defs.name[n_vars] = s; | |
4091 | ||
4092 | s = kstrdup(field_str, GFP_KERNEL); | |
4093 | if (!s) { | |
4094 | kfree(hist_data->attrs->var_defs.name[n_vars]); | |
4095 | ret = -ENOMEM; | |
4096 | goto free; | |
4097 | } | |
4098 | hist_data->attrs->var_defs.expr[n_vars++] = s; | |
4099 | ||
4100 | hist_data->attrs->var_defs.n_vars = n_vars; | |
4101 | } | |
4102 | } | |
4103 | ||
4104 | return ret; | |
4105 | free: | |
4106 | free_var_defs(hist_data); | |
4107 | ||
4108 | return ret; | |
4109 | } | |
4110 | ||
7ef224d1 TZ |
4111 | static int create_hist_fields(struct hist_trigger_data *hist_data, |
4112 | struct trace_event_file *file) | |
4113 | { | |
4114 | int ret; | |
4115 | ||
30350d65 TZ |
4116 | ret = parse_var_defs(hist_data); |
4117 | if (ret) | |
4118 | goto out; | |
4119 | ||
7ef224d1 TZ |
4120 | ret = create_val_fields(hist_data, file); |
4121 | if (ret) | |
4122 | goto out; | |
4123 | ||
30350d65 | 4124 | ret = create_var_fields(hist_data, file); |
7ef224d1 TZ |
4125 | if (ret) |
4126 | goto out; | |
4127 | ||
30350d65 TZ |
4128 | ret = create_key_fields(hist_data, file); |
4129 | if (ret) | |
4130 | goto out; | |
7ef224d1 | 4131 | out: |
30350d65 TZ |
4132 | free_var_defs(hist_data); |
4133 | ||
7ef224d1 TZ |
4134 | return ret; |
4135 | } | |
4136 | ||
e62347d2 TZ |
4137 | static int is_descending(const char *str) |
4138 | { | |
4139 | if (!str) | |
4140 | return 0; | |
4141 | ||
4142 | if (strcmp(str, "descending") == 0) | |
4143 | return 1; | |
4144 | ||
4145 | if (strcmp(str, "ascending") == 0) | |
4146 | return 0; | |
4147 | ||
4148 | return -EINVAL; | |
4149 | } | |
4150 | ||
7ef224d1 TZ |
4151 | static int create_sort_keys(struct hist_trigger_data *hist_data) |
4152 | { | |
e62347d2 | 4153 | char *fields_str = hist_data->attrs->sort_key_str; |
e62347d2 TZ |
4154 | struct tracing_map_sort_key *sort_key; |
4155 | int descending, ret = 0; | |
30350d65 | 4156 | unsigned int i, j, k; |
e62347d2 TZ |
4157 | |
4158 | hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ | |
4159 | ||
4160 | if (!fields_str) | |
4161 | goto out; | |
4162 | ||
4163 | strsep(&fields_str, "="); | |
4164 | if (!fields_str) { | |
4165 | ret = -EINVAL; | |
4166 | goto out; | |
4167 | } | |
4168 | ||
4169 | for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { | |
85013256 | 4170 | struct hist_field *hist_field; |
e62347d2 | 4171 | char *field_str, *field_name; |
85013256 | 4172 | const char *test_name; |
e62347d2 TZ |
4173 | |
4174 | sort_key = &hist_data->sort_keys[i]; | |
4175 | ||
4176 | field_str = strsep(&fields_str, ","); | |
4177 | if (!field_str) { | |
4178 | if (i == 0) | |
4179 | ret = -EINVAL; | |
4180 | break; | |
4181 | } | |
4182 | ||
4183 | if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { | |
4184 | ret = -EINVAL; | |
4185 | break; | |
4186 | } | |
7ef224d1 | 4187 | |
e62347d2 TZ |
4188 | field_name = strsep(&field_str, "."); |
4189 | if (!field_name) { | |
4190 | ret = -EINVAL; | |
4191 | break; | |
4192 | } | |
4193 | ||
4194 | if (strcmp(field_name, "hitcount") == 0) { | |
4195 | descending = is_descending(field_str); | |
4196 | if (descending < 0) { | |
4197 | ret = descending; | |
4198 | break; | |
4199 | } | |
4200 | sort_key->descending = descending; | |
4201 | continue; | |
4202 | } | |
7ef224d1 | 4203 | |
30350d65 TZ |
4204 | for (j = 1, k = 1; j < hist_data->n_fields; j++) { |
4205 | unsigned int idx; | |
4206 | ||
85013256 | 4207 | hist_field = hist_data->fields[j]; |
30350d65 TZ |
4208 | if (hist_field->flags & HIST_FIELD_FL_VAR) |
4209 | continue; | |
4210 | ||
4211 | idx = k++; | |
4212 | ||
85013256 TZ |
4213 | test_name = hist_field_name(hist_field, 0); |
4214 | ||
4215 | if (strcmp(field_name, test_name) == 0) { | |
30350d65 | 4216 | sort_key->field_idx = idx; |
e62347d2 TZ |
4217 | descending = is_descending(field_str); |
4218 | if (descending < 0) { | |
4219 | ret = descending; | |
4220 | goto out; | |
4221 | } | |
4222 | sort_key->descending = descending; | |
4223 | break; | |
4224 | } | |
4225 | } | |
4226 | if (j == hist_data->n_fields) { | |
4227 | ret = -EINVAL; | |
4228 | break; | |
4229 | } | |
4230 | } | |
30350d65 | 4231 | |
e62347d2 TZ |
4232 | hist_data->n_sort_keys = i; |
4233 | out: | |
7ef224d1 TZ |
4234 | return ret; |
4235 | } | |
4236 | ||
0212e2aa TZ |
4237 | static void destroy_actions(struct hist_trigger_data *hist_data) |
4238 | { | |
4239 | unsigned int i; | |
4240 | ||
4241 | for (i = 0; i < hist_data->n_actions; i++) { | |
4242 | struct action_data *data = hist_data->actions[i]; | |
4243 | ||
c282a386 TZ |
4244 | if (data->fn == action_trace) |
4245 | onmatch_destroy(data); | |
50450603 TZ |
4246 | else if (data->fn == onmax_save) |
4247 | onmax_destroy(data); | |
c282a386 TZ |
4248 | else |
4249 | kfree(data); | |
0212e2aa TZ |
4250 | } |
4251 | } | |
4252 | ||
4253 | static int parse_actions(struct hist_trigger_data *hist_data) | |
4254 | { | |
c282a386 TZ |
4255 | struct trace_array *tr = hist_data->event_file->tr; |
4256 | struct action_data *data; | |
0212e2aa TZ |
4257 | unsigned int i; |
4258 | int ret = 0; | |
4259 | char *str; | |
4260 | ||
4261 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4262 | str = hist_data->attrs->action_str[i]; | |
c282a386 TZ |
4263 | |
4264 | if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) { | |
4265 | char *action_str = str + strlen("onmatch("); | |
4266 | ||
4267 | data = onmatch_parse(tr, action_str); | |
4268 | if (IS_ERR(data)) { | |
4269 | ret = PTR_ERR(data); | |
4270 | break; | |
4271 | } | |
4272 | data->fn = action_trace; | |
50450603 TZ |
4273 | } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) { |
4274 | char *action_str = str + strlen("onmax("); | |
4275 | ||
4276 | data = onmax_parse(action_str); | |
4277 | if (IS_ERR(data)) { | |
4278 | ret = PTR_ERR(data); | |
4279 | break; | |
4280 | } | |
4281 | data->fn = onmax_save; | |
c282a386 TZ |
4282 | } else { |
4283 | ret = -EINVAL; | |
4284 | break; | |
4285 | } | |
4286 | ||
4287 | hist_data->actions[hist_data->n_actions++] = data; | |
0212e2aa TZ |
4288 | } |
4289 | ||
4290 | return ret; | |
4291 | } | |
4292 | ||
4293 | static int create_actions(struct hist_trigger_data *hist_data, | |
4294 | struct trace_event_file *file) | |
4295 | { | |
4296 | struct action_data *data; | |
4297 | unsigned int i; | |
4298 | int ret = 0; | |
4299 | ||
4300 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4301 | data = hist_data->actions[i]; | |
c282a386 TZ |
4302 | |
4303 | if (data->fn == action_trace) { | |
4304 | ret = onmatch_create(hist_data, file, data); | |
4305 | if (ret) | |
4306 | return ret; | |
50450603 TZ |
4307 | } else if (data->fn == onmax_save) { |
4308 | ret = onmax_create(hist_data, data); | |
4309 | if (ret) | |
4310 | return ret; | |
c282a386 | 4311 | } |
0212e2aa TZ |
4312 | } |
4313 | ||
4314 | return ret; | |
4315 | } | |
4316 | ||
50450603 TZ |
4317 | static void print_actions(struct seq_file *m, |
4318 | struct hist_trigger_data *hist_data, | |
4319 | struct tracing_map_elt *elt) | |
4320 | { | |
4321 | unsigned int i; | |
4322 | ||
4323 | for (i = 0; i < hist_data->n_actions; i++) { | |
4324 | struct action_data *data = hist_data->actions[i]; | |
4325 | ||
4326 | if (data->fn == onmax_save) | |
4327 | onmax_print(m, hist_data, elt, data); | |
4328 | } | |
4329 | } | |
4330 | ||
4331 | static void print_onmax_spec(struct seq_file *m, | |
4332 | struct hist_trigger_data *hist_data, | |
4333 | struct action_data *data) | |
4334 | { | |
4335 | unsigned int i; | |
4336 | ||
4337 | seq_puts(m, ":onmax("); | |
4338 | seq_printf(m, "%s", data->onmax.var_str); | |
4339 | seq_printf(m, ").%s(", data->onmax.fn_name); | |
4340 | ||
4341 | for (i = 0; i < hist_data->n_max_vars; i++) { | |
4342 | seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name); | |
4343 | if (i < hist_data->n_max_vars - 1) | |
4344 | seq_puts(m, ","); | |
4345 | } | |
4346 | seq_puts(m, ")"); | |
4347 | } | |
4348 | ||
c282a386 TZ |
4349 | static void print_onmatch_spec(struct seq_file *m, |
4350 | struct hist_trigger_data *hist_data, | |
4351 | struct action_data *data) | |
4352 | { | |
4353 | unsigned int i; | |
4354 | ||
4355 | seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system, | |
4356 | data->onmatch.match_event); | |
4357 | ||
4358 | seq_printf(m, "%s(", data->onmatch.synth_event->name); | |
4359 | ||
4360 | for (i = 0; i < data->n_params; i++) { | |
4361 | if (i) | |
4362 | seq_puts(m, ","); | |
4363 | seq_printf(m, "%s", data->params[i]); | |
4364 | } | |
4365 | ||
4366 | seq_puts(m, ")"); | |
4367 | } | |
4368 | ||
48f79473 TZ |
4369 | static bool actions_match(struct hist_trigger_data *hist_data, |
4370 | struct hist_trigger_data *hist_data_test) | |
4371 | { | |
4372 | unsigned int i, j; | |
4373 | ||
4374 | if (hist_data->n_actions != hist_data_test->n_actions) | |
4375 | return false; | |
4376 | ||
4377 | for (i = 0; i < hist_data->n_actions; i++) { | |
4378 | struct action_data *data = hist_data->actions[i]; | |
4379 | struct action_data *data_test = hist_data_test->actions[i]; | |
4380 | ||
4381 | if (data->fn != data_test->fn) | |
4382 | return false; | |
4383 | ||
4384 | if (data->n_params != data_test->n_params) | |
4385 | return false; | |
4386 | ||
4387 | for (j = 0; j < data->n_params; j++) { | |
4388 | if (strcmp(data->params[j], data_test->params[j]) != 0) | |
4389 | return false; | |
4390 | } | |
4391 | ||
4392 | if (data->fn == action_trace) { | |
4393 | if (strcmp(data->onmatch.synth_event_name, | |
4394 | data_test->onmatch.synth_event_name) != 0) | |
4395 | return false; | |
4396 | if (strcmp(data->onmatch.match_event_system, | |
4397 | data_test->onmatch.match_event_system) != 0) | |
4398 | return false; | |
4399 | if (strcmp(data->onmatch.match_event, | |
4400 | data_test->onmatch.match_event) != 0) | |
4401 | return false; | |
4402 | } else if (data->fn == onmax_save) { | |
4403 | if (strcmp(data->onmax.var_str, | |
4404 | data_test->onmax.var_str) != 0) | |
4405 | return false; | |
4406 | if (strcmp(data->onmax.fn_name, | |
4407 | data_test->onmax.fn_name) != 0) | |
4408 | return false; | |
4409 | } | |
4410 | } | |
4411 | ||
4412 | return true; | |
4413 | } | |
4414 | ||
4415 | ||
c282a386 TZ |
4416 | static void print_actions_spec(struct seq_file *m, |
4417 | struct hist_trigger_data *hist_data) | |
4418 | { | |
4419 | unsigned int i; | |
4420 | ||
4421 | for (i = 0; i < hist_data->n_actions; i++) { | |
4422 | struct action_data *data = hist_data->actions[i]; | |
4423 | ||
4424 | if (data->fn == action_trace) | |
4425 | print_onmatch_spec(m, hist_data, data); | |
50450603 TZ |
4426 | else if (data->fn == onmax_save) |
4427 | print_onmax_spec(m, hist_data, data); | |
c282a386 TZ |
4428 | } |
4429 | } | |
4430 | ||
02205a67 TZ |
4431 | static void destroy_field_var_hists(struct hist_trigger_data *hist_data) |
4432 | { | |
4433 | unsigned int i; | |
4434 | ||
4435 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
4436 | kfree(hist_data->field_var_hists[i]->cmd); | |
4437 | kfree(hist_data->field_var_hists[i]); | |
4438 | } | |
4439 | } | |
4440 | ||
7ef224d1 TZ |
4441 | static void destroy_hist_data(struct hist_trigger_data *hist_data) |
4442 | { | |
0212e2aa TZ |
4443 | if (!hist_data) |
4444 | return; | |
4445 | ||
7ef224d1 TZ |
4446 | destroy_hist_trigger_attrs(hist_data->attrs); |
4447 | destroy_hist_fields(hist_data); | |
4448 | tracing_map_destroy(hist_data->map); | |
0212e2aa TZ |
4449 | |
4450 | destroy_actions(hist_data); | |
02205a67 TZ |
4451 | destroy_field_vars(hist_data); |
4452 | destroy_field_var_hists(hist_data); | |
c282a386 | 4453 | destroy_synth_var_refs(hist_data); |
0212e2aa | 4454 | |
7ef224d1 TZ |
4455 | kfree(hist_data); |
4456 | } | |
4457 | ||
4458 | static int create_tracing_map_fields(struct hist_trigger_data *hist_data) | |
4459 | { | |
4460 | struct tracing_map *map = hist_data->map; | |
4461 | struct ftrace_event_field *field; | |
4462 | struct hist_field *hist_field; | |
b28d7b2d | 4463 | int i, idx = 0; |
7ef224d1 TZ |
4464 | |
4465 | for_each_hist_field(i, hist_data) { | |
4466 | hist_field = hist_data->fields[i]; | |
4467 | if (hist_field->flags & HIST_FIELD_FL_KEY) { | |
4468 | tracing_map_cmp_fn_t cmp_fn; | |
4469 | ||
4470 | field = hist_field->field; | |
4471 | ||
69a0200c TZ |
4472 | if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
4473 | cmp_fn = tracing_map_cmp_none; | |
ad42febe TZ |
4474 | else if (!field) |
4475 | cmp_fn = tracing_map_cmp_num(hist_field->size, | |
4476 | hist_field->is_signed); | |
69a0200c | 4477 | else if (is_string_field(field)) |
7ef224d1 TZ |
4478 | cmp_fn = tracing_map_cmp_string; |
4479 | else | |
4480 | cmp_fn = tracing_map_cmp_num(field->size, | |
4481 | field->is_signed); | |
76a3b0c8 TZ |
4482 | idx = tracing_map_add_key_field(map, |
4483 | hist_field->offset, | |
4484 | cmp_fn); | |
30350d65 | 4485 | } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) |
7ef224d1 TZ |
4486 | idx = tracing_map_add_sum_field(map); |
4487 | ||
4488 | if (idx < 0) | |
4489 | return idx; | |
30350d65 TZ |
4490 | |
4491 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
4492 | idx = tracing_map_add_var(map); | |
4493 | if (idx < 0) | |
4494 | return idx; | |
4495 | hist_field->var.idx = idx; | |
4496 | hist_field->var.hist_data = hist_data; | |
4497 | } | |
7ef224d1 TZ |
4498 | } |
4499 | ||
4500 | return 0; | |
4501 | } | |
4502 | ||
4503 | static struct hist_trigger_data * | |
4504 | create_hist_data(unsigned int map_bits, | |
4505 | struct hist_trigger_attrs *attrs, | |
30350d65 TZ |
4506 | struct trace_event_file *file, |
4507 | bool remove) | |
7ef224d1 | 4508 | { |
6b4827ad | 4509 | const struct tracing_map_ops *map_ops = NULL; |
7ef224d1 TZ |
4510 | struct hist_trigger_data *hist_data; |
4511 | int ret = 0; | |
4512 | ||
4513 | hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); | |
4514 | if (!hist_data) | |
4515 | return ERR_PTR(-ENOMEM); | |
4516 | ||
4517 | hist_data->attrs = attrs; | |
30350d65 | 4518 | hist_data->remove = remove; |
067fe038 | 4519 | hist_data->event_file = file; |
7ef224d1 | 4520 | |
0212e2aa TZ |
4521 | ret = parse_actions(hist_data); |
4522 | if (ret) | |
4523 | goto free; | |
4524 | ||
7ef224d1 TZ |
4525 | ret = create_hist_fields(hist_data, file); |
4526 | if (ret) | |
4527 | goto free; | |
4528 | ||
4529 | ret = create_sort_keys(hist_data); | |
4530 | if (ret) | |
4531 | goto free; | |
4532 | ||
af6a29bc | 4533 | map_ops = &hist_trigger_elt_data_ops; |
6b4827ad | 4534 | |
7ef224d1 | 4535 | hist_data->map = tracing_map_create(map_bits, hist_data->key_size, |
6b4827ad | 4536 | map_ops, hist_data); |
7ef224d1 TZ |
4537 | if (IS_ERR(hist_data->map)) { |
4538 | ret = PTR_ERR(hist_data->map); | |
4539 | hist_data->map = NULL; | |
4540 | goto free; | |
4541 | } | |
4542 | ||
4543 | ret = create_tracing_map_fields(hist_data); | |
4544 | if (ret) | |
4545 | goto free; | |
7ef224d1 TZ |
4546 | out: |
4547 | return hist_data; | |
4548 | free: | |
4549 | hist_data->attrs = NULL; | |
4550 | ||
4551 | destroy_hist_data(hist_data); | |
4552 | ||
4553 | hist_data = ERR_PTR(ret); | |
4554 | ||
4555 | goto out; | |
4556 | } | |
4557 | ||
4558 | static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, | |
fbd302cb | 4559 | struct tracing_map_elt *elt, void *rec, |
067fe038 TZ |
4560 | struct ring_buffer_event *rbe, |
4561 | u64 *var_ref_vals) | |
7ef224d1 | 4562 | { |
067fe038 | 4563 | struct hist_elt_data *elt_data; |
7ef224d1 | 4564 | struct hist_field *hist_field; |
30350d65 | 4565 | unsigned int i, var_idx; |
7ef224d1 TZ |
4566 | u64 hist_val; |
4567 | ||
067fe038 TZ |
4568 | elt_data = elt->private_data; |
4569 | elt_data->var_ref_vals = var_ref_vals; | |
4570 | ||
7ef224d1 TZ |
4571 | for_each_hist_val_field(i, hist_data) { |
4572 | hist_field = hist_data->fields[i]; | |
df35d93b | 4573 | hist_val = hist_field->fn(hist_field, elt, rbe, rec); |
30350d65 TZ |
4574 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
4575 | var_idx = hist_field->var.idx; | |
4576 | tracing_map_set_var(elt, var_idx, hist_val); | |
4577 | continue; | |
4578 | } | |
7ef224d1 TZ |
4579 | tracing_map_update_sum(elt, i, hist_val); |
4580 | } | |
30350d65 TZ |
4581 | |
4582 | for_each_hist_key_field(i, hist_data) { | |
4583 | hist_field = hist_data->fields[i]; | |
4584 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
df35d93b | 4585 | hist_val = hist_field->fn(hist_field, elt, rbe, rec); |
30350d65 TZ |
4586 | var_idx = hist_field->var.idx; |
4587 | tracing_map_set_var(elt, var_idx, hist_val); | |
4588 | } | |
4589 | } | |
02205a67 TZ |
4590 | |
4591 | update_field_vars(hist_data, elt, rbe, rec); | |
7ef224d1 TZ |
4592 | } |
4593 | ||
6a475cb1 TZ |
4594 | static inline void add_to_key(char *compound_key, void *key, |
4595 | struct hist_field *key_field, void *rec) | |
4596 | { | |
4597 | size_t size = key_field->size; | |
4598 | ||
4599 | if (key_field->flags & HIST_FIELD_FL_STRING) { | |
4600 | struct ftrace_event_field *field; | |
4601 | ||
4602 | field = key_field->field; | |
4603 | if (field->filter_type == FILTER_DYN_STRING) | |
4604 | size = *(u32 *)(rec + field->offset) >> 16; | |
4605 | else if (field->filter_type == FILTER_PTR_STRING) | |
4606 | size = strlen(key); | |
4607 | else if (field->filter_type == FILTER_STATIC_STRING) | |
4608 | size = field->size; | |
4609 | ||
4610 | /* ensure NULL-termination */ | |
4611 | if (size > key_field->size - 1) | |
4612 | size = key_field->size - 1; | |
4613 | } | |
4614 | ||
4615 | memcpy(compound_key + key_field->offset, key, size); | |
4616 | } | |
4617 | ||
0212e2aa TZ |
4618 | static void |
4619 | hist_trigger_actions(struct hist_trigger_data *hist_data, | |
4620 | struct tracing_map_elt *elt, void *rec, | |
4621 | struct ring_buffer_event *rbe, u64 *var_ref_vals) | |
4622 | { | |
4623 | struct action_data *data; | |
4624 | unsigned int i; | |
4625 | ||
4626 | for (i = 0; i < hist_data->n_actions; i++) { | |
4627 | data = hist_data->actions[i]; | |
4628 | data->fn(hist_data, elt, rec, rbe, data, var_ref_vals); | |
4629 | } | |
4630 | } | |
4631 | ||
1ac4f51c | 4632 | static void event_hist_trigger(struct event_trigger_data *data, void *rec, |
fbd302cb | 4633 | struct ring_buffer_event *rbe) |
7ef224d1 TZ |
4634 | { |
4635 | struct hist_trigger_data *hist_data = data->private_data; | |
6a475cb1 | 4636 | bool use_compound_key = (hist_data->n_keys > 1); |
69a0200c | 4637 | unsigned long entries[HIST_STACKTRACE_DEPTH]; |
067fe038 | 4638 | u64 var_ref_vals[TRACING_MAP_VARS_MAX]; |
76a3b0c8 | 4639 | char compound_key[HIST_KEY_SIZE_MAX]; |
df35d93b | 4640 | struct tracing_map_elt *elt = NULL; |
69a0200c | 4641 | struct stack_trace stacktrace; |
7ef224d1 | 4642 | struct hist_field *key_field; |
7ef224d1 TZ |
4643 | u64 field_contents; |
4644 | void *key = NULL; | |
4645 | unsigned int i; | |
4646 | ||
6a475cb1 | 4647 | memset(compound_key, 0, hist_data->key_size); |
76a3b0c8 | 4648 | |
7ef224d1 TZ |
4649 | for_each_hist_key_field(i, hist_data) { |
4650 | key_field = hist_data->fields[i]; | |
4651 | ||
69a0200c TZ |
4652 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
4653 | stacktrace.max_entries = HIST_STACKTRACE_DEPTH; | |
4654 | stacktrace.entries = entries; | |
4655 | stacktrace.nr_entries = 0; | |
4656 | stacktrace.skip = HIST_STACKTRACE_SKIP; | |
76a3b0c8 | 4657 | |
69a0200c TZ |
4658 | memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE); |
4659 | save_stack_trace(&stacktrace); | |
4660 | ||
4661 | key = entries; | |
4662 | } else { | |
df35d93b | 4663 | field_contents = key_field->fn(key_field, elt, rbe, rec); |
6a475cb1 | 4664 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
69a0200c | 4665 | key = (void *)(unsigned long)field_contents; |
6a475cb1 TZ |
4666 | use_compound_key = true; |
4667 | } else | |
69a0200c | 4668 | key = (void *)&field_contents; |
76a3b0c8 | 4669 | } |
6a475cb1 TZ |
4670 | |
4671 | if (use_compound_key) | |
4672 | add_to_key(compound_key, key, key_field, rec); | |
7ef224d1 TZ |
4673 | } |
4674 | ||
6a475cb1 | 4675 | if (use_compound_key) |
76a3b0c8 TZ |
4676 | key = compound_key; |
4677 | ||
067fe038 TZ |
4678 | if (hist_data->n_var_refs && |
4679 | !resolve_var_refs(hist_data, key, var_ref_vals, false)) | |
4680 | return; | |
4681 | ||
7ef224d1 | 4682 | elt = tracing_map_insert(hist_data->map, key); |
067fe038 TZ |
4683 | if (!elt) |
4684 | return; | |
4685 | ||
4686 | hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals); | |
0212e2aa TZ |
4687 | |
4688 | if (resolve_var_refs(hist_data, key, var_ref_vals, true)) | |
4689 | hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals); | |
7ef224d1 TZ |
4690 | } |
4691 | ||
69a0200c TZ |
4692 | static void hist_trigger_stacktrace_print(struct seq_file *m, |
4693 | unsigned long *stacktrace_entries, | |
4694 | unsigned int max_entries) | |
4695 | { | |
4696 | char str[KSYM_SYMBOL_LEN]; | |
4697 | unsigned int spaces = 8; | |
4698 | unsigned int i; | |
4699 | ||
4700 | for (i = 0; i < max_entries; i++) { | |
4701 | if (stacktrace_entries[i] == ULONG_MAX) | |
4702 | return; | |
4703 | ||
4704 | seq_printf(m, "%*c", 1 + spaces, ' '); | |
4705 | sprint_symbol(str, stacktrace_entries[i]); | |
4706 | seq_printf(m, "%s\n", str); | |
4707 | } | |
4708 | } | |
4709 | ||
7ef224d1 TZ |
4710 | static void |
4711 | hist_trigger_entry_print(struct seq_file *m, | |
4712 | struct hist_trigger_data *hist_data, void *key, | |
4713 | struct tracing_map_elt *elt) | |
4714 | { | |
4715 | struct hist_field *key_field; | |
c6afad49 | 4716 | char str[KSYM_SYMBOL_LEN]; |
69a0200c | 4717 | bool multiline = false; |
85013256 | 4718 | const char *field_name; |
7ef224d1 TZ |
4719 | unsigned int i; |
4720 | u64 uval; | |
4721 | ||
4722 | seq_puts(m, "{ "); | |
4723 | ||
4724 | for_each_hist_key_field(i, hist_data) { | |
4725 | key_field = hist_data->fields[i]; | |
4726 | ||
4727 | if (i > hist_data->n_vals) | |
4728 | seq_puts(m, ", "); | |
4729 | ||
85013256 TZ |
4730 | field_name = hist_field_name(key_field, 0); |
4731 | ||
0c4a6b46 TZ |
4732 | if (key_field->flags & HIST_FIELD_FL_HEX) { |
4733 | uval = *(u64 *)(key + key_field->offset); | |
85013256 | 4734 | seq_printf(m, "%s: %llx", field_name, uval); |
c6afad49 TZ |
4735 | } else if (key_field->flags & HIST_FIELD_FL_SYM) { |
4736 | uval = *(u64 *)(key + key_field->offset); | |
4737 | sprint_symbol_no_offset(str, uval); | |
85013256 TZ |
4738 | seq_printf(m, "%s: [%llx] %-45s", field_name, |
4739 | uval, str); | |
c6afad49 TZ |
4740 | } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { |
4741 | uval = *(u64 *)(key + key_field->offset); | |
4742 | sprint_symbol(str, uval); | |
85013256 TZ |
4743 | seq_printf(m, "%s: [%llx] %-55s", field_name, |
4744 | uval, str); | |
6b4827ad | 4745 | } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { |
af6a29bc TZ |
4746 | struct hist_elt_data *elt_data = elt->private_data; |
4747 | char *comm; | |
4748 | ||
4749 | if (WARN_ON_ONCE(!elt_data)) | |
4750 | return; | |
4751 | ||
4752 | comm = elt_data->comm; | |
6b4827ad TZ |
4753 | |
4754 | uval = *(u64 *)(key + key_field->offset); | |
85013256 TZ |
4755 | seq_printf(m, "%s: %-16s[%10llu]", field_name, |
4756 | comm, uval); | |
31696198 TZ |
4757 | } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { |
4758 | const char *syscall_name; | |
4759 | ||
4760 | uval = *(u64 *)(key + key_field->offset); | |
4761 | syscall_name = get_syscall_name(uval); | |
4762 | if (!syscall_name) | |
4763 | syscall_name = "unknown_syscall"; | |
4764 | ||
85013256 TZ |
4765 | seq_printf(m, "%s: %-30s[%3llu]", field_name, |
4766 | syscall_name, uval); | |
69a0200c TZ |
4767 | } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
4768 | seq_puts(m, "stacktrace:\n"); | |
4769 | hist_trigger_stacktrace_print(m, | |
4770 | key + key_field->offset, | |
4771 | HIST_STACKTRACE_DEPTH); | |
4772 | multiline = true; | |
4b94f5b7 | 4773 | } else if (key_field->flags & HIST_FIELD_FL_LOG2) { |
85013256 | 4774 | seq_printf(m, "%s: ~ 2^%-2llu", field_name, |
4b94f5b7 | 4775 | *(u64 *)(key + key_field->offset)); |
0c4a6b46 | 4776 | } else if (key_field->flags & HIST_FIELD_FL_STRING) { |
85013256 | 4777 | seq_printf(m, "%s: %-50s", field_name, |
76a3b0c8 | 4778 | (char *)(key + key_field->offset)); |
7ef224d1 | 4779 | } else { |
76a3b0c8 | 4780 | uval = *(u64 *)(key + key_field->offset); |
85013256 | 4781 | seq_printf(m, "%s: %10llu", field_name, uval); |
7ef224d1 TZ |
4782 | } |
4783 | } | |
4784 | ||
69a0200c TZ |
4785 | if (!multiline) |
4786 | seq_puts(m, " "); | |
4787 | ||
4788 | seq_puts(m, "}"); | |
7ef224d1 TZ |
4789 | |
4790 | seq_printf(m, " hitcount: %10llu", | |
4791 | tracing_map_read_sum(elt, HITCOUNT_IDX)); | |
4792 | ||
f2606835 | 4793 | for (i = 1; i < hist_data->n_vals; i++) { |
85013256 TZ |
4794 | field_name = hist_field_name(hist_data->fields[i], 0); |
4795 | ||
100719dc TZ |
4796 | if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR || |
4797 | hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR) | |
30350d65 TZ |
4798 | continue; |
4799 | ||
0c4a6b46 | 4800 | if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { |
85013256 | 4801 | seq_printf(m, " %s: %10llx", field_name, |
0c4a6b46 TZ |
4802 | tracing_map_read_sum(elt, i)); |
4803 | } else { | |
85013256 | 4804 | seq_printf(m, " %s: %10llu", field_name, |
0c4a6b46 TZ |
4805 | tracing_map_read_sum(elt, i)); |
4806 | } | |
f2606835 TZ |
4807 | } |
4808 | ||
50450603 TZ |
4809 | print_actions(m, hist_data, elt); |
4810 | ||
7ef224d1 TZ |
4811 | seq_puts(m, "\n"); |
4812 | } | |
4813 | ||
4814 | static int print_entries(struct seq_file *m, | |
4815 | struct hist_trigger_data *hist_data) | |
4816 | { | |
4817 | struct tracing_map_sort_entry **sort_entries = NULL; | |
4818 | struct tracing_map *map = hist_data->map; | |
d50c744e | 4819 | int i, n_entries; |
7ef224d1 TZ |
4820 | |
4821 | n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, | |
4822 | hist_data->n_sort_keys, | |
4823 | &sort_entries); | |
4824 | if (n_entries < 0) | |
4825 | return n_entries; | |
4826 | ||
4827 | for (i = 0; i < n_entries; i++) | |
4828 | hist_trigger_entry_print(m, hist_data, | |
4829 | sort_entries[i]->key, | |
4830 | sort_entries[i]->elt); | |
4831 | ||
4832 | tracing_map_destroy_sort_entries(sort_entries, n_entries); | |
4833 | ||
4834 | return n_entries; | |
4835 | } | |
4836 | ||
52a7f16d TZ |
4837 | static void hist_trigger_show(struct seq_file *m, |
4838 | struct event_trigger_data *data, int n) | |
7ef224d1 | 4839 | { |
7ef224d1 | 4840 | struct hist_trigger_data *hist_data; |
6e7a2398 | 4841 | int n_entries; |
7ef224d1 | 4842 | |
52a7f16d TZ |
4843 | if (n > 0) |
4844 | seq_puts(m, "\n\n"); | |
7ef224d1 TZ |
4845 | |
4846 | seq_puts(m, "# event histogram\n#\n# trigger info: "); | |
4847 | data->ops->print(m, data->ops, data); | |
52a7f16d | 4848 | seq_puts(m, "#\n\n"); |
7ef224d1 TZ |
4849 | |
4850 | hist_data = data->private_data; | |
4851 | n_entries = print_entries(m, hist_data); | |
6e7a2398 | 4852 | if (n_entries < 0) |
7ef224d1 | 4853 | n_entries = 0; |
7ef224d1 TZ |
4854 | |
4855 | seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", | |
4856 | (u64)atomic64_read(&hist_data->map->hits), | |
4857 | n_entries, (u64)atomic64_read(&hist_data->map->drops)); | |
52a7f16d TZ |
4858 | } |
4859 | ||
4860 | static int hist_show(struct seq_file *m, void *v) | |
4861 | { | |
4862 | struct event_trigger_data *data; | |
4863 | struct trace_event_file *event_file; | |
4864 | int n = 0, ret = 0; | |
4865 | ||
4866 | mutex_lock(&event_mutex); | |
4867 | ||
4868 | event_file = event_file_data(m->private); | |
4869 | if (unlikely(!event_file)) { | |
4870 | ret = -ENODEV; | |
4871 | goto out_unlock; | |
4872 | } | |
4873 | ||
4874 | list_for_each_entry_rcu(data, &event_file->triggers, list) { | |
4875 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) | |
4876 | hist_trigger_show(m, data, n++); | |
4877 | } | |
4878 | ||
f404da6e TZ |
4879 | if (have_hist_err()) { |
4880 | seq_printf(m, "\nERROR: %s\n", hist_err_str); | |
4881 | seq_printf(m, " Last command: %s\n", last_hist_cmd); | |
4882 | } | |
4883 | ||
7ef224d1 TZ |
4884 | out_unlock: |
4885 | mutex_unlock(&event_mutex); | |
4886 | ||
4887 | return ret; | |
4888 | } | |
4889 | ||
4890 | static int event_hist_open(struct inode *inode, struct file *file) | |
4891 | { | |
4892 | return single_open(file, hist_show, file); | |
4893 | } | |
4894 | ||
4895 | const struct file_operations event_hist_fops = { | |
4896 | .open = event_hist_open, | |
4897 | .read = seq_read, | |
4898 | .llseek = seq_lseek, | |
4899 | .release = single_release, | |
4900 | }; | |
4901 | ||
4902 | static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) | |
4903 | { | |
85013256 TZ |
4904 | const char *field_name = hist_field_name(hist_field, 0); |
4905 | ||
30350d65 TZ |
4906 | if (hist_field->var.name) |
4907 | seq_printf(m, "%s=", hist_field->var.name); | |
4908 | ||
0ae7961e | 4909 | if (hist_field->flags & HIST_FIELD_FL_CPU) |
8b7622bf | 4910 | seq_puts(m, "cpu"); |
067fe038 | 4911 | else if (field_name) { |
7e8b88a3 TZ |
4912 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF || |
4913 | hist_field->flags & HIST_FIELD_FL_ALIAS) | |
067fe038 | 4914 | seq_putc(m, '$'); |
ad42febe | 4915 | seq_printf(m, "%s", field_name); |
0ae7961e TZ |
4916 | } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) |
4917 | seq_puts(m, "common_timestamp"); | |
608940da TZ |
4918 | |
4919 | if (hist_field->flags) { | |
4920 | if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) && | |
4921 | !(hist_field->flags & HIST_FIELD_FL_EXPR)) { | |
4922 | const char *flags = get_hist_field_flags(hist_field); | |
4923 | ||
4924 | if (flags) | |
4925 | seq_printf(m, ".%s", flags); | |
4926 | } | |
4927 | } | |
7ef224d1 TZ |
4928 | } |
4929 | ||
4930 | static int event_hist_trigger_print(struct seq_file *m, | |
4931 | struct event_trigger_ops *ops, | |
4932 | struct event_trigger_data *data) | |
4933 | { | |
4934 | struct hist_trigger_data *hist_data = data->private_data; | |
30350d65 TZ |
4935 | struct hist_field *field; |
4936 | bool have_var = false; | |
7ef224d1 TZ |
4937 | unsigned int i; |
4938 | ||
5463bfda TZ |
4939 | seq_puts(m, "hist:"); |
4940 | ||
4941 | if (data->name) | |
4942 | seq_printf(m, "%s:", data->name); | |
4943 | ||
4944 | seq_puts(m, "keys="); | |
7ef224d1 TZ |
4945 | |
4946 | for_each_hist_key_field(i, hist_data) { | |
30350d65 | 4947 | field = hist_data->fields[i]; |
7ef224d1 TZ |
4948 | |
4949 | if (i > hist_data->n_vals) | |
4950 | seq_puts(m, ","); | |
4951 | ||
30350d65 | 4952 | if (field->flags & HIST_FIELD_FL_STACKTRACE) |
69a0200c TZ |
4953 | seq_puts(m, "stacktrace"); |
4954 | else | |
30350d65 | 4955 | hist_field_print(m, field); |
7ef224d1 TZ |
4956 | } |
4957 | ||
4958 | seq_puts(m, ":vals="); | |
f2606835 TZ |
4959 | |
4960 | for_each_hist_val_field(i, hist_data) { | |
30350d65 TZ |
4961 | field = hist_data->fields[i]; |
4962 | if (field->flags & HIST_FIELD_FL_VAR) { | |
4963 | have_var = true; | |
4964 | continue; | |
4965 | } | |
4966 | ||
f2606835 TZ |
4967 | if (i == HITCOUNT_IDX) |
4968 | seq_puts(m, "hitcount"); | |
4969 | else { | |
4970 | seq_puts(m, ","); | |
30350d65 TZ |
4971 | hist_field_print(m, field); |
4972 | } | |
4973 | } | |
4974 | ||
4975 | if (have_var) { | |
4976 | unsigned int n = 0; | |
4977 | ||
4978 | seq_puts(m, ":"); | |
4979 | ||
4980 | for_each_hist_val_field(i, hist_data) { | |
4981 | field = hist_data->fields[i]; | |
4982 | ||
4983 | if (field->flags & HIST_FIELD_FL_VAR) { | |
4984 | if (n++) | |
4985 | seq_puts(m, ","); | |
4986 | hist_field_print(m, field); | |
4987 | } | |
f2606835 TZ |
4988 | } |
4989 | } | |
7ef224d1 TZ |
4990 | |
4991 | seq_puts(m, ":sort="); | |
e62347d2 TZ |
4992 | |
4993 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
4994 | struct tracing_map_sort_key *sort_key; | |
30350d65 TZ |
4995 | unsigned int idx, first_key_idx; |
4996 | ||
4997 | /* skip VAR vals */ | |
4998 | first_key_idx = hist_data->n_vals - hist_data->n_vars; | |
e62347d2 TZ |
4999 | |
5000 | sort_key = &hist_data->sort_keys[i]; | |
ad42febe TZ |
5001 | idx = sort_key->field_idx; |
5002 | ||
1a361dfc | 5003 | if (WARN_ON(idx >= HIST_FIELDS_MAX)) |
ad42febe | 5004 | return -EINVAL; |
e62347d2 TZ |
5005 | |
5006 | if (i > 0) | |
5007 | seq_puts(m, ","); | |
5008 | ||
ad42febe | 5009 | if (idx == HITCOUNT_IDX) |
e62347d2 | 5010 | seq_puts(m, "hitcount"); |
30350d65 TZ |
5011 | else { |
5012 | if (idx >= first_key_idx) | |
5013 | idx += hist_data->n_vars; | |
e62347d2 | 5014 | hist_field_print(m, hist_data->fields[idx]); |
30350d65 | 5015 | } |
e62347d2 TZ |
5016 | |
5017 | if (sort_key->descending) | |
5018 | seq_puts(m, ".descending"); | |
5019 | } | |
7ef224d1 | 5020 | seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); |
a4072fe8 TZ |
5021 | if (hist_data->enable_timestamps) |
5022 | seq_printf(m, ":clock=%s", hist_data->attrs->clock); | |
7ef224d1 | 5023 | |
c282a386 TZ |
5024 | print_actions_spec(m, hist_data); |
5025 | ||
7ef224d1 TZ |
5026 | if (data->filter_str) |
5027 | seq_printf(m, " if %s", data->filter_str); | |
5028 | ||
83e99914 TZ |
5029 | if (data->paused) |
5030 | seq_puts(m, " [paused]"); | |
5031 | else | |
5032 | seq_puts(m, " [active]"); | |
7ef224d1 TZ |
5033 | |
5034 | seq_putc(m, '\n'); | |
5035 | ||
5036 | return 0; | |
5037 | } | |
5038 | ||
5463bfda TZ |
5039 | static int event_hist_trigger_init(struct event_trigger_ops *ops, |
5040 | struct event_trigger_data *data) | |
5041 | { | |
5042 | struct hist_trigger_data *hist_data = data->private_data; | |
5043 | ||
5044 | if (!data->ref && hist_data->attrs->name) | |
5045 | save_named_trigger(hist_data->attrs->name, data); | |
5046 | ||
5047 | data->ref++; | |
5048 | ||
5049 | return 0; | |
5050 | } | |
5051 | ||
02205a67 TZ |
5052 | static void unregister_field_var_hists(struct hist_trigger_data *hist_data) |
5053 | { | |
5054 | struct trace_event_file *file; | |
5055 | unsigned int i; | |
5056 | char *cmd; | |
5057 | int ret; | |
5058 | ||
5059 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
5060 | file = hist_data->field_var_hists[i]->hist_data->event_file; | |
5061 | cmd = hist_data->field_var_hists[i]->cmd; | |
5062 | ret = event_hist_trigger_func(&trigger_hist_cmd, file, | |
5063 | "!hist", "hist", cmd); | |
5064 | } | |
5065 | } | |
5066 | ||
7ef224d1 TZ |
5067 | static void event_hist_trigger_free(struct event_trigger_ops *ops, |
5068 | struct event_trigger_data *data) | |
5069 | { | |
5070 | struct hist_trigger_data *hist_data = data->private_data; | |
5071 | ||
5072 | if (WARN_ON_ONCE(data->ref <= 0)) | |
5073 | return; | |
5074 | ||
5075 | data->ref--; | |
5076 | if (!data->ref) { | |
5463bfda TZ |
5077 | if (data->name) |
5078 | del_named_trigger(data); | |
067fe038 | 5079 | |
7ef224d1 | 5080 | trigger_data_free(data); |
067fe038 TZ |
5081 | |
5082 | remove_hist_vars(hist_data); | |
5083 | ||
02205a67 TZ |
5084 | unregister_field_var_hists(hist_data); |
5085 | ||
7ef224d1 TZ |
5086 | destroy_hist_data(hist_data); |
5087 | } | |
5088 | } | |
5089 | ||
5090 | static struct event_trigger_ops event_hist_trigger_ops = { | |
5091 | .func = event_hist_trigger, | |
5092 | .print = event_hist_trigger_print, | |
5463bfda | 5093 | .init = event_hist_trigger_init, |
7ef224d1 TZ |
5094 | .free = event_hist_trigger_free, |
5095 | }; | |
5096 | ||
5463bfda TZ |
5097 | static int event_hist_trigger_named_init(struct event_trigger_ops *ops, |
5098 | struct event_trigger_data *data) | |
5099 | { | |
5100 | data->ref++; | |
5101 | ||
5102 | save_named_trigger(data->named_data->name, data); | |
5103 | ||
5104 | event_hist_trigger_init(ops, data->named_data); | |
5105 | ||
5106 | return 0; | |
5107 | } | |
5108 | ||
5109 | static void event_hist_trigger_named_free(struct event_trigger_ops *ops, | |
5110 | struct event_trigger_data *data) | |
5111 | { | |
5112 | if (WARN_ON_ONCE(data->ref <= 0)) | |
5113 | return; | |
5114 | ||
5115 | event_hist_trigger_free(ops, data->named_data); | |
5116 | ||
5117 | data->ref--; | |
5118 | if (!data->ref) { | |
5119 | del_named_trigger(data); | |
5120 | trigger_data_free(data); | |
5121 | } | |
5122 | } | |
5123 | ||
5124 | static struct event_trigger_ops event_hist_trigger_named_ops = { | |
5125 | .func = event_hist_trigger, | |
5126 | .print = event_hist_trigger_print, | |
5127 | .init = event_hist_trigger_named_init, | |
5128 | .free = event_hist_trigger_named_free, | |
5129 | }; | |
5130 | ||
7ef224d1 TZ |
5131 | static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, |
5132 | char *param) | |
5133 | { | |
5134 | return &event_hist_trigger_ops; | |
5135 | } | |
5136 | ||
e86ae9ba TZ |
5137 | static void hist_clear(struct event_trigger_data *data) |
5138 | { | |
5139 | struct hist_trigger_data *hist_data = data->private_data; | |
e86ae9ba | 5140 | |
5463bfda TZ |
5141 | if (data->name) |
5142 | pause_named_trigger(data); | |
e86ae9ba TZ |
5143 | |
5144 | synchronize_sched(); | |
5145 | ||
5146 | tracing_map_clear(hist_data->map); | |
5147 | ||
5463bfda TZ |
5148 | if (data->name) |
5149 | unpause_named_trigger(data); | |
5150 | } | |
5151 | ||
5152 | static bool compatible_field(struct ftrace_event_field *field, | |
5153 | struct ftrace_event_field *test_field) | |
5154 | { | |
5155 | if (field == test_field) | |
5156 | return true; | |
5157 | if (field == NULL || test_field == NULL) | |
5158 | return false; | |
5159 | if (strcmp(field->name, test_field->name) != 0) | |
5160 | return false; | |
5161 | if (strcmp(field->type, test_field->type) != 0) | |
5162 | return false; | |
5163 | if (field->size != test_field->size) | |
5164 | return false; | |
5165 | if (field->is_signed != test_field->is_signed) | |
5166 | return false; | |
5167 | ||
5168 | return true; | |
e86ae9ba TZ |
5169 | } |
5170 | ||
52a7f16d | 5171 | static bool hist_trigger_match(struct event_trigger_data *data, |
5463bfda TZ |
5172 | struct event_trigger_data *data_test, |
5173 | struct event_trigger_data *named_data, | |
5174 | bool ignore_filter) | |
52a7f16d TZ |
5175 | { |
5176 | struct tracing_map_sort_key *sort_key, *sort_key_test; | |
5177 | struct hist_trigger_data *hist_data, *hist_data_test; | |
5178 | struct hist_field *key_field, *key_field_test; | |
5179 | unsigned int i; | |
5180 | ||
5463bfda TZ |
5181 | if (named_data && (named_data != data_test) && |
5182 | (named_data != data_test->named_data)) | |
5183 | return false; | |
5184 | ||
5185 | if (!named_data && is_named_trigger(data_test)) | |
5186 | return false; | |
5187 | ||
52a7f16d TZ |
5188 | hist_data = data->private_data; |
5189 | hist_data_test = data_test->private_data; | |
5190 | ||
5191 | if (hist_data->n_vals != hist_data_test->n_vals || | |
5192 | hist_data->n_fields != hist_data_test->n_fields || | |
5193 | hist_data->n_sort_keys != hist_data_test->n_sort_keys) | |
5194 | return false; | |
5195 | ||
5463bfda TZ |
5196 | if (!ignore_filter) { |
5197 | if ((data->filter_str && !data_test->filter_str) || | |
5198 | (!data->filter_str && data_test->filter_str)) | |
5199 | return false; | |
5200 | } | |
52a7f16d TZ |
5201 | |
5202 | for_each_hist_field(i, hist_data) { | |
5203 | key_field = hist_data->fields[i]; | |
5204 | key_field_test = hist_data_test->fields[i]; | |
5205 | ||
5206 | if (key_field->flags != key_field_test->flags) | |
5207 | return false; | |
5463bfda | 5208 | if (!compatible_field(key_field->field, key_field_test->field)) |
52a7f16d TZ |
5209 | return false; |
5210 | if (key_field->offset != key_field_test->offset) | |
5211 | return false; | |
ad42febe TZ |
5212 | if (key_field->size != key_field_test->size) |
5213 | return false; | |
5214 | if (key_field->is_signed != key_field_test->is_signed) | |
5215 | return false; | |
1a361dfc TZ |
5216 | if (!!key_field->var.name != !!key_field_test->var.name) |
5217 | return false; | |
5218 | if (key_field->var.name && | |
5219 | strcmp(key_field->var.name, key_field_test->var.name) != 0) | |
5220 | return false; | |
52a7f16d TZ |
5221 | } |
5222 | ||
5223 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
5224 | sort_key = &hist_data->sort_keys[i]; | |
5225 | sort_key_test = &hist_data_test->sort_keys[i]; | |
5226 | ||
5227 | if (sort_key->field_idx != sort_key_test->field_idx || | |
5228 | sort_key->descending != sort_key_test->descending) | |
5229 | return false; | |
5230 | } | |
5231 | ||
5463bfda | 5232 | if (!ignore_filter && data->filter_str && |
52a7f16d TZ |
5233 | (strcmp(data->filter_str, data_test->filter_str) != 0)) |
5234 | return false; | |
5235 | ||
48f79473 TZ |
5236 | if (!actions_match(hist_data, hist_data_test)) |
5237 | return false; | |
5238 | ||
52a7f16d TZ |
5239 | return true; |
5240 | } | |
5241 | ||
7ef224d1 TZ |
5242 | static int hist_register_trigger(char *glob, struct event_trigger_ops *ops, |
5243 | struct event_trigger_data *data, | |
5244 | struct trace_event_file *file) | |
5245 | { | |
83e99914 | 5246 | struct hist_trigger_data *hist_data = data->private_data; |
5463bfda | 5247 | struct event_trigger_data *test, *named_data = NULL; |
7ef224d1 TZ |
5248 | int ret = 0; |
5249 | ||
5463bfda TZ |
5250 | if (hist_data->attrs->name) { |
5251 | named_data = find_named_trigger(hist_data->attrs->name); | |
5252 | if (named_data) { | |
5253 | if (!hist_trigger_match(data, named_data, named_data, | |
5254 | true)) { | |
f404da6e | 5255 | hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name); |
5463bfda TZ |
5256 | ret = -EINVAL; |
5257 | goto out; | |
5258 | } | |
5259 | } | |
5260 | } | |
5261 | ||
5262 | if (hist_data->attrs->name && !named_data) | |
5263 | goto new; | |
5264 | ||
7ef224d1 TZ |
5265 | list_for_each_entry_rcu(test, &file->triggers, list) { |
5266 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 5267 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d | 5268 | continue; |
83e99914 TZ |
5269 | if (hist_data->attrs->pause) |
5270 | test->paused = true; | |
5271 | else if (hist_data->attrs->cont) | |
5272 | test->paused = false; | |
e86ae9ba TZ |
5273 | else if (hist_data->attrs->clear) |
5274 | hist_clear(test); | |
f404da6e TZ |
5275 | else { |
5276 | hist_err("Hist trigger already exists", NULL); | |
83e99914 | 5277 | ret = -EEXIST; |
f404da6e | 5278 | } |
7ef224d1 TZ |
5279 | goto out; |
5280 | } | |
5281 | } | |
5463bfda | 5282 | new: |
e86ae9ba | 5283 | if (hist_data->attrs->cont || hist_data->attrs->clear) { |
f404da6e | 5284 | hist_err("Can't clear or continue a nonexistent hist trigger", NULL); |
83e99914 TZ |
5285 | ret = -ENOENT; |
5286 | goto out; | |
5287 | } | |
5288 | ||
7522c03a TZ |
5289 | if (hist_data->attrs->pause) |
5290 | data->paused = true; | |
5291 | ||
5463bfda | 5292 | if (named_data) { |
5463bfda TZ |
5293 | data->private_data = named_data->private_data; |
5294 | set_named_trigger_data(data, named_data); | |
5295 | data->ops = &event_hist_trigger_named_ops; | |
5296 | } | |
5297 | ||
7ef224d1 TZ |
5298 | if (data->ops->init) { |
5299 | ret = data->ops->init(data->ops, data); | |
5300 | if (ret < 0) | |
5301 | goto out; | |
5302 | } | |
5303 | ||
a4072fe8 TZ |
5304 | if (hist_data->enable_timestamps) { |
5305 | char *clock = hist_data->attrs->clock; | |
5306 | ||
5307 | ret = tracing_set_clock(file->tr, hist_data->attrs->clock); | |
5308 | if (ret) { | |
5309 | hist_err("Couldn't set trace_clock: ", clock); | |
5310 | goto out; | |
5311 | } | |
7ef224d1 | 5312 | |
ad42febe | 5313 | tracing_set_time_stamp_abs(file->tr, true); |
a4072fe8 TZ |
5314 | } |
5315 | ||
5316 | if (named_data) | |
5317 | destroy_hist_data(hist_data); | |
5318 | ||
5319 | ret++; | |
067fe038 TZ |
5320 | out: |
5321 | return ret; | |
5322 | } | |
5323 | ||
5324 | static int hist_trigger_enable(struct event_trigger_data *data, | |
5325 | struct trace_event_file *file) | |
5326 | { | |
5327 | int ret = 0; | |
5328 | ||
5329 | list_add_tail_rcu(&data->list, &file->triggers); | |
5330 | ||
5331 | update_cond_flag(file); | |
ad42febe | 5332 | |
7ef224d1 TZ |
5333 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
5334 | list_del_rcu(&data->list); | |
5335 | update_cond_flag(file); | |
5336 | ret--; | |
5337 | } | |
067fe038 | 5338 | |
7ef224d1 TZ |
5339 | return ret; |
5340 | } | |
5341 | ||
4b147936 TZ |
5342 | static bool have_hist_trigger_match(struct event_trigger_data *data, |
5343 | struct trace_event_file *file) | |
5344 | { | |
5345 | struct hist_trigger_data *hist_data = data->private_data; | |
5346 | struct event_trigger_data *test, *named_data = NULL; | |
5347 | bool match = false; | |
5348 | ||
5349 | if (hist_data->attrs->name) | |
5350 | named_data = find_named_trigger(hist_data->attrs->name); | |
5351 | ||
5352 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5353 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5354 | if (hist_trigger_match(data, test, named_data, false)) { | |
5355 | match = true; | |
5356 | break; | |
5357 | } | |
5358 | } | |
5359 | } | |
5360 | ||
5361 | return match; | |
5362 | } | |
5363 | ||
067fe038 TZ |
5364 | static bool hist_trigger_check_refs(struct event_trigger_data *data, |
5365 | struct trace_event_file *file) | |
5366 | { | |
5367 | struct hist_trigger_data *hist_data = data->private_data; | |
5368 | struct event_trigger_data *test, *named_data = NULL; | |
5369 | ||
5370 | if (hist_data->attrs->name) | |
5371 | named_data = find_named_trigger(hist_data->attrs->name); | |
5372 | ||
5373 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5374 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5375 | if (!hist_trigger_match(data, test, named_data, false)) | |
5376 | continue; | |
5377 | hist_data = test->private_data; | |
5378 | if (check_var_refs(hist_data)) | |
5379 | return true; | |
5380 | break; | |
5381 | } | |
5382 | } | |
5383 | ||
5384 | return false; | |
5385 | } | |
5386 | ||
52a7f16d TZ |
5387 | static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops, |
5388 | struct event_trigger_data *data, | |
5389 | struct trace_event_file *file) | |
5390 | { | |
5463bfda TZ |
5391 | struct hist_trigger_data *hist_data = data->private_data; |
5392 | struct event_trigger_data *test, *named_data = NULL; | |
52a7f16d TZ |
5393 | bool unregistered = false; |
5394 | ||
5463bfda TZ |
5395 | if (hist_data->attrs->name) |
5396 | named_data = find_named_trigger(hist_data->attrs->name); | |
5397 | ||
52a7f16d TZ |
5398 | list_for_each_entry_rcu(test, &file->triggers, list) { |
5399 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 5400 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d TZ |
5401 | continue; |
5402 | unregistered = true; | |
5403 | list_del_rcu(&test->list); | |
5404 | trace_event_trigger_enable_disable(file, 0); | |
5405 | update_cond_flag(file); | |
5406 | break; | |
5407 | } | |
5408 | } | |
5409 | ||
5410 | if (unregistered && test->ops->free) | |
5411 | test->ops->free(test->ops, test); | |
ad42febe TZ |
5412 | |
5413 | if (hist_data->enable_timestamps) { | |
30350d65 | 5414 | if (!hist_data->remove || unregistered) |
ad42febe TZ |
5415 | tracing_set_time_stamp_abs(file->tr, false); |
5416 | } | |
52a7f16d TZ |
5417 | } |
5418 | ||
067fe038 TZ |
5419 | static bool hist_file_check_refs(struct trace_event_file *file) |
5420 | { | |
5421 | struct hist_trigger_data *hist_data; | |
5422 | struct event_trigger_data *test; | |
5423 | ||
5424 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5425 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5426 | hist_data = test->private_data; | |
5427 | if (check_var_refs(hist_data)) | |
5428 | return true; | |
5429 | } | |
5430 | } | |
5431 | ||
5432 | return false; | |
5433 | } | |
5434 | ||
52a7f16d TZ |
5435 | static void hist_unreg_all(struct trace_event_file *file) |
5436 | { | |
47c18569 | 5437 | struct event_trigger_data *test, *n; |
ad42febe | 5438 | struct hist_trigger_data *hist_data; |
4b147936 TZ |
5439 | struct synth_event *se; |
5440 | const char *se_name; | |
52a7f16d | 5441 | |
067fe038 TZ |
5442 | if (hist_file_check_refs(file)) |
5443 | return; | |
5444 | ||
47c18569 | 5445 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d | 5446 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
ad42febe | 5447 | hist_data = test->private_data; |
52a7f16d TZ |
5448 | list_del_rcu(&test->list); |
5449 | trace_event_trigger_enable_disable(file, 0); | |
4b147936 TZ |
5450 | |
5451 | mutex_lock(&synth_event_mutex); | |
5452 | se_name = trace_event_name(file->event_call); | |
5453 | se = find_synth_event(se_name); | |
5454 | if (se) | |
5455 | se->ref--; | |
5456 | mutex_unlock(&synth_event_mutex); | |
5457 | ||
52a7f16d | 5458 | update_cond_flag(file); |
ad42febe TZ |
5459 | if (hist_data->enable_timestamps) |
5460 | tracing_set_time_stamp_abs(file->tr, false); | |
52a7f16d TZ |
5461 | if (test->ops->free) |
5462 | test->ops->free(test->ops, test); | |
5463 | } | |
5464 | } | |
5465 | } | |
5466 | ||
7ef224d1 TZ |
5467 | static int event_hist_trigger_func(struct event_command *cmd_ops, |
5468 | struct trace_event_file *file, | |
5469 | char *glob, char *cmd, char *param) | |
5470 | { | |
5471 | unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; | |
5472 | struct event_trigger_data *trigger_data; | |
5473 | struct hist_trigger_attrs *attrs; | |
5474 | struct event_trigger_ops *trigger_ops; | |
5475 | struct hist_trigger_data *hist_data; | |
4b147936 TZ |
5476 | struct synth_event *se; |
5477 | const char *se_name; | |
30350d65 | 5478 | bool remove = false; |
ec5ce098 | 5479 | char *trigger, *p; |
7ef224d1 TZ |
5480 | int ret = 0; |
5481 | ||
f404da6e TZ |
5482 | if (glob && strlen(glob)) { |
5483 | last_cmd_set(param); | |
5484 | hist_err_clear(); | |
5485 | } | |
5486 | ||
7ef224d1 TZ |
5487 | if (!param) |
5488 | return -EINVAL; | |
5489 | ||
30350d65 TZ |
5490 | if (glob[0] == '!') |
5491 | remove = true; | |
5492 | ||
ec5ce098 TZ |
5493 | /* |
5494 | * separate the trigger from the filter (k:v [if filter]) | |
5495 | * allowing for whitespace in the trigger | |
5496 | */ | |
5497 | p = trigger = param; | |
5498 | do { | |
5499 | p = strstr(p, "if"); | |
5500 | if (!p) | |
5501 | break; | |
5502 | if (p == param) | |
5503 | return -EINVAL; | |
5504 | if (*(p - 1) != ' ' && *(p - 1) != '\t') { | |
5505 | p++; | |
5506 | continue; | |
5507 | } | |
5508 | if (p >= param + strlen(param) - strlen("if") - 1) | |
5509 | return -EINVAL; | |
5510 | if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') { | |
5511 | p++; | |
5512 | continue; | |
5513 | } | |
5514 | break; | |
5515 | } while (p); | |
5516 | ||
5517 | if (!p) | |
5518 | param = NULL; | |
5519 | else { | |
5520 | *(p - 1) = '\0'; | |
5521 | param = strstrip(p); | |
5522 | trigger = strstrip(trigger); | |
5523 | } | |
7ef224d1 TZ |
5524 | |
5525 | attrs = parse_hist_trigger_attrs(trigger); | |
5526 | if (IS_ERR(attrs)) | |
5527 | return PTR_ERR(attrs); | |
5528 | ||
5529 | if (attrs->map_bits) | |
5530 | hist_trigger_bits = attrs->map_bits; | |
5531 | ||
30350d65 | 5532 | hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove); |
7ef224d1 TZ |
5533 | if (IS_ERR(hist_data)) { |
5534 | destroy_hist_trigger_attrs(attrs); | |
5535 | return PTR_ERR(hist_data); | |
5536 | } | |
5537 | ||
5538 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); | |
5539 | ||
7ef224d1 | 5540 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); |
4b147936 TZ |
5541 | if (!trigger_data) { |
5542 | ret = -ENOMEM; | |
7ef224d1 | 5543 | goto out_free; |
4b147936 | 5544 | } |
7ef224d1 TZ |
5545 | |
5546 | trigger_data->count = -1; | |
5547 | trigger_data->ops = trigger_ops; | |
5548 | trigger_data->cmd_ops = cmd_ops; | |
5549 | ||
5550 | INIT_LIST_HEAD(&trigger_data->list); | |
5551 | RCU_INIT_POINTER(trigger_data->filter, NULL); | |
5552 | ||
5553 | trigger_data->private_data = hist_data; | |
5554 | ||
52a7f16d TZ |
5555 | /* if param is non-empty, it's supposed to be a filter */ |
5556 | if (param && cmd_ops->set_filter) { | |
5557 | ret = cmd_ops->set_filter(param, trigger_data, file); | |
5558 | if (ret < 0) | |
5559 | goto out_free; | |
5560 | } | |
5561 | ||
30350d65 | 5562 | if (remove) { |
4b147936 TZ |
5563 | if (!have_hist_trigger_match(trigger_data, file)) |
5564 | goto out_free; | |
5565 | ||
067fe038 TZ |
5566 | if (hist_trigger_check_refs(trigger_data, file)) { |
5567 | ret = -EBUSY; | |
5568 | goto out_free; | |
5569 | } | |
5570 | ||
7ef224d1 | 5571 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); |
4b147936 TZ |
5572 | |
5573 | mutex_lock(&synth_event_mutex); | |
5574 | se_name = trace_event_name(file->event_call); | |
5575 | se = find_synth_event(se_name); | |
5576 | if (se) | |
5577 | se->ref--; | |
5578 | mutex_unlock(&synth_event_mutex); | |
5579 | ||
7ef224d1 TZ |
5580 | ret = 0; |
5581 | goto out_free; | |
5582 | } | |
5583 | ||
7ef224d1 TZ |
5584 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
5585 | /* | |
5586 | * The above returns on success the # of triggers registered, | |
5587 | * but if it didn't register any it returns zero. Consider no | |
5588 | * triggers registered a failure too. | |
5589 | */ | |
5590 | if (!ret) { | |
e86ae9ba | 5591 | if (!(attrs->pause || attrs->cont || attrs->clear)) |
83e99914 | 5592 | ret = -ENOENT; |
7ef224d1 TZ |
5593 | goto out_free; |
5594 | } else if (ret < 0) | |
5595 | goto out_free; | |
067fe038 TZ |
5596 | |
5597 | if (get_named_trigger_data(trigger_data)) | |
5598 | goto enable; | |
5599 | ||
5600 | if (has_hist_vars(hist_data)) | |
5601 | save_hist_vars(hist_data); | |
5602 | ||
0212e2aa TZ |
5603 | ret = create_actions(hist_data, file); |
5604 | if (ret) | |
5605 | goto out_unreg; | |
5606 | ||
067fe038 TZ |
5607 | ret = tracing_map_init(hist_data->map); |
5608 | if (ret) | |
5609 | goto out_unreg; | |
5610 | enable: | |
5611 | ret = hist_trigger_enable(trigger_data, file); | |
5612 | if (ret) | |
5613 | goto out_unreg; | |
5614 | ||
4b147936 TZ |
5615 | mutex_lock(&synth_event_mutex); |
5616 | se_name = trace_event_name(file->event_call); | |
5617 | se = find_synth_event(se_name); | |
5618 | if (se) | |
5619 | se->ref++; | |
5620 | mutex_unlock(&synth_event_mutex); | |
5621 | ||
7ef224d1 TZ |
5622 | /* Just return zero, not the number of registered triggers */ |
5623 | ret = 0; | |
5624 | out: | |
f404da6e TZ |
5625 | if (ret == 0) |
5626 | hist_err_clear(); | |
5627 | ||
7ef224d1 | 5628 | return ret; |
067fe038 TZ |
5629 | out_unreg: |
5630 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); | |
7ef224d1 TZ |
5631 | out_free: |
5632 | if (cmd_ops->set_filter) | |
5633 | cmd_ops->set_filter(NULL, trigger_data, NULL); | |
5634 | ||
067fe038 TZ |
5635 | remove_hist_vars(hist_data); |
5636 | ||
7ef224d1 TZ |
5637 | kfree(trigger_data); |
5638 | ||
5639 | destroy_hist_data(hist_data); | |
5640 | goto out; | |
5641 | } | |
5642 | ||
5643 | static struct event_command trigger_hist_cmd = { | |
5644 | .name = "hist", | |
5645 | .trigger_type = ETT_EVENT_HIST, | |
5646 | .flags = EVENT_CMD_FL_NEEDS_REC, | |
5647 | .func = event_hist_trigger_func, | |
5648 | .reg = hist_register_trigger, | |
52a7f16d TZ |
5649 | .unreg = hist_unregister_trigger, |
5650 | .unreg_all = hist_unreg_all, | |
7ef224d1 TZ |
5651 | .get_trigger_ops = event_hist_get_trigger_ops, |
5652 | .set_filter = set_trigger_filter, | |
5653 | }; | |
5654 | ||
5655 | __init int register_trigger_hist_cmd(void) | |
5656 | { | |
5657 | int ret; | |
5658 | ||
5659 | ret = register_event_command(&trigger_hist_cmd); | |
5660 | WARN_ON(ret < 0); | |
5661 | ||
5662 | return ret; | |
5663 | } | |
d0bad49b TZ |
5664 | |
5665 | static void | |
1ac4f51c TZ |
5666 | hist_enable_trigger(struct event_trigger_data *data, void *rec, |
5667 | struct ring_buffer_event *event) | |
d0bad49b TZ |
5668 | { |
5669 | struct enable_trigger_data *enable_data = data->private_data; | |
5670 | struct event_trigger_data *test; | |
5671 | ||
5672 | list_for_each_entry_rcu(test, &enable_data->file->triggers, list) { | |
5673 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5674 | if (enable_data->enable) | |
5675 | test->paused = false; | |
5676 | else | |
5677 | test->paused = true; | |
d0bad49b TZ |
5678 | } |
5679 | } | |
5680 | } | |
5681 | ||
5682 | static void | |
1ac4f51c TZ |
5683 | hist_enable_count_trigger(struct event_trigger_data *data, void *rec, |
5684 | struct ring_buffer_event *event) | |
d0bad49b TZ |
5685 | { |
5686 | if (!data->count) | |
5687 | return; | |
5688 | ||
5689 | if (data->count != -1) | |
5690 | (data->count)--; | |
5691 | ||
1ac4f51c | 5692 | hist_enable_trigger(data, rec, event); |
d0bad49b TZ |
5693 | } |
5694 | ||
5695 | static struct event_trigger_ops hist_enable_trigger_ops = { | |
5696 | .func = hist_enable_trigger, | |
5697 | .print = event_enable_trigger_print, | |
5698 | .init = event_trigger_init, | |
5699 | .free = event_enable_trigger_free, | |
5700 | }; | |
5701 | ||
5702 | static struct event_trigger_ops hist_enable_count_trigger_ops = { | |
5703 | .func = hist_enable_count_trigger, | |
5704 | .print = event_enable_trigger_print, | |
5705 | .init = event_trigger_init, | |
5706 | .free = event_enable_trigger_free, | |
5707 | }; | |
5708 | ||
5709 | static struct event_trigger_ops hist_disable_trigger_ops = { | |
5710 | .func = hist_enable_trigger, | |
5711 | .print = event_enable_trigger_print, | |
5712 | .init = event_trigger_init, | |
5713 | .free = event_enable_trigger_free, | |
5714 | }; | |
5715 | ||
5716 | static struct event_trigger_ops hist_disable_count_trigger_ops = { | |
5717 | .func = hist_enable_count_trigger, | |
5718 | .print = event_enable_trigger_print, | |
5719 | .init = event_trigger_init, | |
5720 | .free = event_enable_trigger_free, | |
5721 | }; | |
5722 | ||
5723 | static struct event_trigger_ops * | |
5724 | hist_enable_get_trigger_ops(char *cmd, char *param) | |
5725 | { | |
5726 | struct event_trigger_ops *ops; | |
5727 | bool enable; | |
5728 | ||
5729 | enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); | |
5730 | ||
5731 | if (enable) | |
5732 | ops = param ? &hist_enable_count_trigger_ops : | |
5733 | &hist_enable_trigger_ops; | |
5734 | else | |
5735 | ops = param ? &hist_disable_count_trigger_ops : | |
5736 | &hist_disable_trigger_ops; | |
5737 | ||
5738 | return ops; | |
5739 | } | |
5740 | ||
52a7f16d TZ |
5741 | static void hist_enable_unreg_all(struct trace_event_file *file) |
5742 | { | |
47c18569 | 5743 | struct event_trigger_data *test, *n; |
52a7f16d | 5744 | |
47c18569 | 5745 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d TZ |
5746 | if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { |
5747 | list_del_rcu(&test->list); | |
5748 | update_cond_flag(file); | |
5749 | trace_event_trigger_enable_disable(file, 0); | |
5750 | if (test->ops->free) | |
5751 | test->ops->free(test->ops, test); | |
5752 | } | |
5753 | } | |
5754 | } | |
5755 | ||
d0bad49b TZ |
5756 | static struct event_command trigger_hist_enable_cmd = { |
5757 | .name = ENABLE_HIST_STR, | |
5758 | .trigger_type = ETT_HIST_ENABLE, | |
5759 | .func = event_enable_trigger_func, | |
5760 | .reg = event_enable_register_trigger, | |
5761 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 5762 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
5763 | .get_trigger_ops = hist_enable_get_trigger_ops, |
5764 | .set_filter = set_trigger_filter, | |
5765 | }; | |
5766 | ||
5767 | static struct event_command trigger_hist_disable_cmd = { | |
5768 | .name = DISABLE_HIST_STR, | |
5769 | .trigger_type = ETT_HIST_ENABLE, | |
5770 | .func = event_enable_trigger_func, | |
5771 | .reg = event_enable_register_trigger, | |
5772 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 5773 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
5774 | .get_trigger_ops = hist_enable_get_trigger_ops, |
5775 | .set_filter = set_trigger_filter, | |
5776 | }; | |
5777 | ||
5778 | static __init void unregister_trigger_hist_enable_disable_cmds(void) | |
5779 | { | |
5780 | unregister_event_command(&trigger_hist_enable_cmd); | |
5781 | unregister_event_command(&trigger_hist_disable_cmd); | |
5782 | } | |
5783 | ||
5784 | __init int register_trigger_hist_enable_disable_cmds(void) | |
5785 | { | |
5786 | int ret; | |
5787 | ||
5788 | ret = register_event_command(&trigger_hist_enable_cmd); | |
5789 | if (WARN_ON(ret < 0)) | |
5790 | return ret; | |
5791 | ret = register_event_command(&trigger_hist_disable_cmd); | |
5792 | if (WARN_ON(ret < 0)) | |
5793 | unregister_trigger_hist_enable_disable_cmds(); | |
5794 | ||
5795 | return ret; | |
5796 | } | |
4b147936 TZ |
5797 | |
5798 | static __init int trace_events_hist_init(void) | |
5799 | { | |
5800 | struct dentry *entry = NULL; | |
5801 | struct dentry *d_tracer; | |
5802 | int err = 0; | |
5803 | ||
5804 | d_tracer = tracing_init_dentry(); | |
5805 | if (IS_ERR(d_tracer)) { | |
5806 | err = PTR_ERR(d_tracer); | |
5807 | goto err; | |
5808 | } | |
5809 | ||
5810 | entry = tracefs_create_file("synthetic_events", 0644, d_tracer, | |
5811 | NULL, &synth_events_fops); | |
5812 | if (!entry) { | |
5813 | err = -ENODEV; | |
5814 | goto err; | |
5815 | } | |
5816 | ||
5817 | return err; | |
5818 | err: | |
5819 | pr_warn("Could not create tracefs 'synthetic_events' entry\n"); | |
5820 | ||
5821 | return err; | |
5822 | } | |
5823 | ||
5824 | fs_initcall(trace_events_hist_init); |