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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 | |
396 | strncpy(err, var, MAX_FILTER_STR_VAL); | |
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 { | |
2469 | field = ERR_PTR(-EINVAL); | |
2470 | goto out; | |
2471 | } | |
2472 | } | |
2473 | ||
2474 | if (strcmp(field_name, "common_timestamp") == 0) { | |
2475 | *flags |= HIST_FIELD_FL_TIMESTAMP; | |
2476 | hist_data->enable_timestamps = true; | |
2477 | if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) | |
2478 | hist_data->attrs->ts_in_usecs = true; | |
8b7622bf TZ |
2479 | } else if (strcmp(field_name, "cpu") == 0) |
2480 | *flags |= HIST_FIELD_FL_CPU; | |
2481 | else { | |
100719dc TZ |
2482 | field = trace_find_event_field(file->event_call, field_name); |
2483 | if (!field || !field->size) { | |
2484 | field = ERR_PTR(-EINVAL); | |
2485 | goto out; | |
2486 | } | |
2487 | } | |
2488 | out: | |
2489 | kfree(str); | |
2490 | ||
2491 | return field; | |
2492 | } | |
2493 | ||
7e8b88a3 TZ |
2494 | static struct hist_field *create_alias(struct hist_trigger_data *hist_data, |
2495 | struct hist_field *var_ref, | |
2496 | char *var_name) | |
2497 | { | |
2498 | struct hist_field *alias = NULL; | |
2499 | unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; | |
2500 | ||
2501 | alias = create_hist_field(hist_data, NULL, flags, var_name); | |
2502 | if (!alias) | |
2503 | return NULL; | |
2504 | ||
2505 | alias->fn = var_ref->fn; | |
2506 | alias->operands[0] = var_ref; | |
2507 | ||
2508 | if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { | |
2509 | destroy_hist_field(alias, 0); | |
2510 | return NULL; | |
2511 | } | |
2512 | ||
2513 | return alias; | |
2514 | } | |
2515 | ||
100719dc TZ |
2516 | static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, |
2517 | struct trace_event_file *file, char *str, | |
2518 | unsigned long *flags, char *var_name) | |
2519 | { | |
067fe038 | 2520 | char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; |
100719dc TZ |
2521 | struct ftrace_event_field *field = NULL; |
2522 | struct hist_field *hist_field = NULL; | |
2523 | int ret = 0; | |
2524 | ||
067fe038 TZ |
2525 | s = strchr(str, '.'); |
2526 | if (s) { | |
2527 | s = strchr(++s, '.'); | |
2528 | if (s) { | |
2529 | ref_system = strsep(&str, "."); | |
2530 | if (!str) { | |
2531 | ret = -EINVAL; | |
2532 | goto out; | |
2533 | } | |
2534 | ref_event = strsep(&str, "."); | |
2535 | if (!str) { | |
2536 | ret = -EINVAL; | |
2537 | goto out; | |
2538 | } | |
2539 | ref_var = str; | |
2540 | } | |
2541 | } | |
2542 | ||
2543 | s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); | |
2544 | if (!s) { | |
2545 | hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var); | |
2546 | if (hist_field) { | |
2547 | hist_data->var_refs[hist_data->n_var_refs] = hist_field; | |
2548 | hist_field->var_ref_idx = hist_data->n_var_refs++; | |
7e8b88a3 TZ |
2549 | if (var_name) { |
2550 | hist_field = create_alias(hist_data, hist_field, var_name); | |
2551 | if (!hist_field) { | |
2552 | ret = -ENOMEM; | |
2553 | goto out; | |
2554 | } | |
2555 | } | |
067fe038 TZ |
2556 | return hist_field; |
2557 | } | |
2558 | } else | |
2559 | str = s; | |
2560 | ||
100719dc TZ |
2561 | field = parse_field(hist_data, file, str, flags); |
2562 | if (IS_ERR(field)) { | |
2563 | ret = PTR_ERR(field); | |
2564 | goto out; | |
2565 | } | |
2566 | ||
2567 | hist_field = create_hist_field(hist_data, field, *flags, var_name); | |
2568 | if (!hist_field) { | |
2569 | ret = -ENOMEM; | |
2570 | goto out; | |
2571 | } | |
2572 | ||
2573 | return hist_field; | |
2574 | out: | |
2575 | return ERR_PTR(ret); | |
2576 | } | |
2577 | ||
2578 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2579 | struct trace_event_file *file, | |
2580 | char *str, unsigned long flags, | |
2581 | char *var_name, unsigned int level); | |
2582 | ||
2583 | static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, | |
2584 | struct trace_event_file *file, | |
2585 | char *str, unsigned long flags, | |
2586 | char *var_name, unsigned int level) | |
2587 | { | |
2588 | struct hist_field *operand1, *expr = NULL; | |
2589 | unsigned long operand_flags; | |
2590 | int ret = 0; | |
2591 | char *s; | |
2592 | ||
2593 | /* we support only -(xxx) i.e. explicit parens required */ | |
2594 | ||
2595 | if (level > 3) { | |
f404da6e | 2596 | hist_err("Too many subexpressions (3 max): ", str); |
100719dc TZ |
2597 | ret = -EINVAL; |
2598 | goto free; | |
2599 | } | |
2600 | ||
2601 | str++; /* skip leading '-' */ | |
2602 | ||
2603 | s = strchr(str, '('); | |
2604 | if (s) | |
2605 | str++; | |
2606 | else { | |
2607 | ret = -EINVAL; | |
2608 | goto free; | |
2609 | } | |
2610 | ||
2611 | s = strrchr(str, ')'); | |
2612 | if (s) | |
2613 | *s = '\0'; | |
2614 | else { | |
2615 | ret = -EINVAL; /* no closing ')' */ | |
2616 | goto free; | |
2617 | } | |
2618 | ||
2619 | flags |= HIST_FIELD_FL_EXPR; | |
2620 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2621 | if (!expr) { | |
2622 | ret = -ENOMEM; | |
2623 | goto free; | |
2624 | } | |
2625 | ||
2626 | operand_flags = 0; | |
2627 | operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); | |
2628 | if (IS_ERR(operand1)) { | |
2629 | ret = PTR_ERR(operand1); | |
2630 | goto free; | |
2631 | } | |
2632 | ||
2633 | expr->flags |= operand1->flags & | |
2634 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2635 | expr->fn = hist_field_unary_minus; | |
2636 | expr->operands[0] = operand1; | |
2637 | expr->operator = FIELD_OP_UNARY_MINUS; | |
2638 | expr->name = expr_str(expr, 0); | |
19a9facd TZ |
2639 | expr->type = kstrdup(operand1->type, GFP_KERNEL); |
2640 | if (!expr->type) { | |
2641 | ret = -ENOMEM; | |
2642 | goto free; | |
2643 | } | |
100719dc TZ |
2644 | |
2645 | return expr; | |
2646 | free: | |
2647 | destroy_hist_field(expr, 0); | |
2648 | return ERR_PTR(ret); | |
2649 | } | |
2650 | ||
2651 | static int check_expr_operands(struct hist_field *operand1, | |
2652 | struct hist_field *operand2) | |
2653 | { | |
2654 | unsigned long operand1_flags = operand1->flags; | |
2655 | unsigned long operand2_flags = operand2->flags; | |
2656 | ||
7e8b88a3 TZ |
2657 | if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || |
2658 | (operand1_flags & HIST_FIELD_FL_ALIAS)) { | |
2659 | struct hist_field *var; | |
2660 | ||
2661 | var = find_var_field(operand1->var.hist_data, operand1->name); | |
2662 | if (!var) | |
2663 | return -EINVAL; | |
2664 | operand1_flags = var->flags; | |
2665 | } | |
2666 | ||
2667 | if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || | |
2668 | (operand2_flags & HIST_FIELD_FL_ALIAS)) { | |
2669 | struct hist_field *var; | |
2670 | ||
2671 | var = find_var_field(operand2->var.hist_data, operand2->name); | |
2672 | if (!var) | |
2673 | return -EINVAL; | |
2674 | operand2_flags = var->flags; | |
2675 | } | |
2676 | ||
100719dc | 2677 | if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != |
f404da6e TZ |
2678 | (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { |
2679 | hist_err("Timestamp units in expression don't match", NULL); | |
100719dc | 2680 | return -EINVAL; |
f404da6e | 2681 | } |
100719dc TZ |
2682 | |
2683 | return 0; | |
2684 | } | |
2685 | ||
2686 | static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, | |
2687 | struct trace_event_file *file, | |
2688 | char *str, unsigned long flags, | |
2689 | char *var_name, unsigned int level) | |
2690 | { | |
2691 | struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; | |
2692 | unsigned long operand_flags; | |
2693 | int field_op, ret = -EINVAL; | |
2694 | char *sep, *operand1_str; | |
2695 | ||
f404da6e TZ |
2696 | if (level > 3) { |
2697 | hist_err("Too many subexpressions (3 max): ", str); | |
100719dc | 2698 | return ERR_PTR(-EINVAL); |
f404da6e | 2699 | } |
100719dc TZ |
2700 | |
2701 | field_op = contains_operator(str); | |
2702 | ||
2703 | if (field_op == FIELD_OP_NONE) | |
2704 | return parse_atom(hist_data, file, str, &flags, var_name); | |
2705 | ||
2706 | if (field_op == FIELD_OP_UNARY_MINUS) | |
2707 | return parse_unary(hist_data, file, str, flags, var_name, ++level); | |
2708 | ||
2709 | switch (field_op) { | |
2710 | case FIELD_OP_MINUS: | |
2711 | sep = "-"; | |
2712 | break; | |
2713 | case FIELD_OP_PLUS: | |
2714 | sep = "+"; | |
2715 | break; | |
2716 | default: | |
2717 | goto free; | |
2718 | } | |
2719 | ||
2720 | operand1_str = strsep(&str, sep); | |
2721 | if (!operand1_str || !str) | |
2722 | goto free; | |
2723 | ||
2724 | operand_flags = 0; | |
2725 | operand1 = parse_atom(hist_data, file, operand1_str, | |
2726 | &operand_flags, NULL); | |
2727 | if (IS_ERR(operand1)) { | |
2728 | ret = PTR_ERR(operand1); | |
2729 | operand1 = NULL; | |
2730 | goto free; | |
2731 | } | |
2732 | ||
2733 | /* rest of string could be another expression e.g. b+c in a+b+c */ | |
2734 | operand_flags = 0; | |
2735 | operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); | |
2736 | if (IS_ERR(operand2)) { | |
2737 | ret = PTR_ERR(operand2); | |
2738 | operand2 = NULL; | |
2739 | goto free; | |
2740 | } | |
2741 | ||
2742 | ret = check_expr_operands(operand1, operand2); | |
2743 | if (ret) | |
2744 | goto free; | |
2745 | ||
2746 | flags |= HIST_FIELD_FL_EXPR; | |
2747 | ||
2748 | flags |= operand1->flags & | |
2749 | (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); | |
2750 | ||
2751 | expr = create_hist_field(hist_data, NULL, flags, var_name); | |
2752 | if (!expr) { | |
2753 | ret = -ENOMEM; | |
2754 | goto free; | |
2755 | } | |
2756 | ||
067fe038 TZ |
2757 | operand1->read_once = true; |
2758 | operand2->read_once = true; | |
2759 | ||
100719dc TZ |
2760 | expr->operands[0] = operand1; |
2761 | expr->operands[1] = operand2; | |
2762 | expr->operator = field_op; | |
2763 | expr->name = expr_str(expr, 0); | |
19a9facd TZ |
2764 | expr->type = kstrdup(operand1->type, GFP_KERNEL); |
2765 | if (!expr->type) { | |
2766 | ret = -ENOMEM; | |
2767 | goto free; | |
2768 | } | |
100719dc TZ |
2769 | |
2770 | switch (field_op) { | |
2771 | case FIELD_OP_MINUS: | |
2772 | expr->fn = hist_field_minus; | |
2773 | break; | |
2774 | case FIELD_OP_PLUS: | |
2775 | expr->fn = hist_field_plus; | |
2776 | break; | |
2777 | default: | |
5e4cf2bf | 2778 | ret = -EINVAL; |
100719dc TZ |
2779 | goto free; |
2780 | } | |
2781 | ||
2782 | return expr; | |
2783 | free: | |
2784 | destroy_hist_field(operand1, 0); | |
2785 | destroy_hist_field(operand2, 0); | |
2786 | destroy_hist_field(expr, 0); | |
2787 | ||
2788 | return ERR_PTR(ret); | |
2789 | } | |
2790 | ||
02205a67 TZ |
2791 | static char *find_trigger_filter(struct hist_trigger_data *hist_data, |
2792 | struct trace_event_file *file) | |
2793 | { | |
2794 | struct event_trigger_data *test; | |
2795 | ||
2796 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
2797 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
2798 | if (test->private_data == hist_data) | |
2799 | return test->filter_str; | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | return NULL; | |
2804 | } | |
2805 | ||
2806 | static struct event_command trigger_hist_cmd; | |
2807 | static int event_hist_trigger_func(struct event_command *cmd_ops, | |
2808 | struct trace_event_file *file, | |
2809 | char *glob, char *cmd, char *param); | |
2810 | ||
2811 | static bool compatible_keys(struct hist_trigger_data *target_hist_data, | |
2812 | struct hist_trigger_data *hist_data, | |
2813 | unsigned int n_keys) | |
2814 | { | |
2815 | struct hist_field *target_hist_field, *hist_field; | |
2816 | unsigned int n, i, j; | |
2817 | ||
2818 | if (hist_data->n_fields - hist_data->n_vals != n_keys) | |
2819 | return false; | |
2820 | ||
2821 | i = hist_data->n_vals; | |
2822 | j = target_hist_data->n_vals; | |
2823 | ||
2824 | for (n = 0; n < n_keys; n++) { | |
2825 | hist_field = hist_data->fields[i + n]; | |
2826 | target_hist_field = target_hist_data->fields[j + n]; | |
2827 | ||
2828 | if (strcmp(hist_field->type, target_hist_field->type) != 0) | |
2829 | return false; | |
2830 | if (hist_field->size != target_hist_field->size) | |
2831 | return false; | |
2832 | if (hist_field->is_signed != target_hist_field->is_signed) | |
2833 | return false; | |
2834 | } | |
2835 | ||
2836 | return true; | |
2837 | } | |
2838 | ||
2839 | static struct hist_trigger_data * | |
2840 | find_compatible_hist(struct hist_trigger_data *target_hist_data, | |
2841 | struct trace_event_file *file) | |
2842 | { | |
2843 | struct hist_trigger_data *hist_data; | |
2844 | struct event_trigger_data *test; | |
2845 | unsigned int n_keys; | |
2846 | ||
2847 | n_keys = target_hist_data->n_fields - target_hist_data->n_vals; | |
2848 | ||
2849 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
2850 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
2851 | hist_data = test->private_data; | |
2852 | ||
2853 | if (compatible_keys(target_hist_data, hist_data, n_keys)) | |
2854 | return hist_data; | |
2855 | } | |
2856 | } | |
2857 | ||
2858 | return NULL; | |
2859 | } | |
2860 | ||
2861 | static struct trace_event_file *event_file(struct trace_array *tr, | |
2862 | char *system, char *event_name) | |
2863 | { | |
2864 | struct trace_event_file *file; | |
2865 | ||
2866 | file = find_event_file(tr, system, event_name); | |
2867 | if (!file) | |
2868 | return ERR_PTR(-EINVAL); | |
2869 | ||
2870 | return file; | |
2871 | } | |
2872 | ||
2873 | static struct hist_field * | |
2874 | find_synthetic_field_var(struct hist_trigger_data *target_hist_data, | |
2875 | char *system, char *event_name, char *field_name) | |
2876 | { | |
2877 | struct hist_field *event_var; | |
2878 | char *synthetic_name; | |
2879 | ||
2880 | synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2881 | if (!synthetic_name) | |
2882 | return ERR_PTR(-ENOMEM); | |
2883 | ||
2884 | strcpy(synthetic_name, "synthetic_"); | |
2885 | strcat(synthetic_name, field_name); | |
2886 | ||
2887 | event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); | |
2888 | ||
2889 | kfree(synthetic_name); | |
2890 | ||
2891 | return event_var; | |
2892 | } | |
2893 | ||
2894 | /** | |
2895 | * create_field_var_hist - Automatically create a histogram and var for a field | |
2896 | * @target_hist_data: The target hist trigger | |
2897 | * @subsys_name: Optional subsystem name | |
2898 | * @event_name: Optional event name | |
2899 | * @field_name: The name of the field (and the resulting variable) | |
2900 | * | |
2901 | * Hist trigger actions fetch data from variables, not directly from | |
2902 | * events. However, for convenience, users are allowed to directly | |
2903 | * specify an event field in an action, which will be automatically | |
2904 | * converted into a variable on their behalf. | |
2905 | ||
2906 | * If a user specifies a field on an event that isn't the event the | |
2907 | * histogram currently being defined (the target event histogram), the | |
2908 | * only way that can be accomplished is if a new hist trigger is | |
2909 | * created and the field variable defined on that. | |
2910 | * | |
2911 | * This function creates a new histogram compatible with the target | |
2912 | * event (meaning a histogram with the same key as the target | |
2913 | * histogram), and creates a variable for the specified field, but | |
2914 | * with 'synthetic_' prepended to the variable name in order to avoid | |
2915 | * collision with normal field variables. | |
2916 | * | |
2917 | * Return: The variable created for the field. | |
2918 | */ | |
c282a386 | 2919 | static struct hist_field * |
02205a67 TZ |
2920 | create_field_var_hist(struct hist_trigger_data *target_hist_data, |
2921 | char *subsys_name, char *event_name, char *field_name) | |
2922 | { | |
2923 | struct trace_array *tr = target_hist_data->event_file->tr; | |
2924 | struct hist_field *event_var = ERR_PTR(-EINVAL); | |
2925 | struct hist_trigger_data *hist_data; | |
2926 | unsigned int i, n, first = true; | |
2927 | struct field_var_hist *var_hist; | |
2928 | struct trace_event_file *file; | |
2929 | struct hist_field *key_field; | |
2930 | char *saved_filter; | |
2931 | char *cmd; | |
2932 | int ret; | |
2933 | ||
f404da6e TZ |
2934 | if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { |
2935 | hist_err_event("onmatch: Too many field variables defined: ", | |
2936 | subsys_name, event_name, field_name); | |
02205a67 | 2937 | return ERR_PTR(-EINVAL); |
f404da6e | 2938 | } |
02205a67 TZ |
2939 | |
2940 | file = event_file(tr, subsys_name, event_name); | |
2941 | ||
2942 | if (IS_ERR(file)) { | |
f404da6e TZ |
2943 | hist_err_event("onmatch: Event file not found: ", |
2944 | subsys_name, event_name, field_name); | |
02205a67 TZ |
2945 | ret = PTR_ERR(file); |
2946 | return ERR_PTR(ret); | |
2947 | } | |
2948 | ||
2949 | /* | |
2950 | * Look for a histogram compatible with target. We'll use the | |
2951 | * found histogram specification to create a new matching | |
2952 | * histogram with our variable on it. target_hist_data is not | |
2953 | * yet a registered histogram so we can't use that. | |
2954 | */ | |
2955 | hist_data = find_compatible_hist(target_hist_data, file); | |
f404da6e TZ |
2956 | if (!hist_data) { |
2957 | hist_err_event("onmatch: Matching event histogram not found: ", | |
2958 | subsys_name, event_name, field_name); | |
02205a67 | 2959 | return ERR_PTR(-EINVAL); |
f404da6e | 2960 | } |
02205a67 TZ |
2961 | |
2962 | /* See if a synthetic field variable has already been created */ | |
2963 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
2964 | event_name, field_name); | |
2965 | if (!IS_ERR_OR_NULL(event_var)) | |
2966 | return event_var; | |
2967 | ||
2968 | var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); | |
2969 | if (!var_hist) | |
2970 | return ERR_PTR(-ENOMEM); | |
2971 | ||
2972 | cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); | |
2973 | if (!cmd) { | |
2974 | kfree(var_hist); | |
2975 | return ERR_PTR(-ENOMEM); | |
2976 | } | |
2977 | ||
2978 | /* Use the same keys as the compatible histogram */ | |
2979 | strcat(cmd, "keys="); | |
2980 | ||
2981 | for_each_hist_key_field(i, hist_data) { | |
2982 | key_field = hist_data->fields[i]; | |
2983 | if (!first) | |
2984 | strcat(cmd, ","); | |
2985 | strcat(cmd, key_field->field->name); | |
2986 | first = false; | |
2987 | } | |
2988 | ||
2989 | /* Create the synthetic field variable specification */ | |
2990 | strcat(cmd, ":synthetic_"); | |
2991 | strcat(cmd, field_name); | |
2992 | strcat(cmd, "="); | |
2993 | strcat(cmd, field_name); | |
2994 | ||
2995 | /* Use the same filter as the compatible histogram */ | |
2996 | saved_filter = find_trigger_filter(hist_data, file); | |
2997 | if (saved_filter) { | |
2998 | strcat(cmd, " if "); | |
2999 | strcat(cmd, saved_filter); | |
3000 | } | |
3001 | ||
3002 | var_hist->cmd = kstrdup(cmd, GFP_KERNEL); | |
3003 | if (!var_hist->cmd) { | |
3004 | kfree(cmd); | |
3005 | kfree(var_hist); | |
3006 | return ERR_PTR(-ENOMEM); | |
3007 | } | |
3008 | ||
3009 | /* Save the compatible histogram information */ | |
3010 | var_hist->hist_data = hist_data; | |
3011 | ||
3012 | /* Create the new histogram with our variable */ | |
3013 | ret = event_hist_trigger_func(&trigger_hist_cmd, file, | |
3014 | "", "hist", cmd); | |
3015 | if (ret) { | |
3016 | kfree(cmd); | |
3017 | kfree(var_hist->cmd); | |
3018 | kfree(var_hist); | |
f404da6e TZ |
3019 | hist_err_event("onmatch: Couldn't create histogram for field: ", |
3020 | subsys_name, event_name, field_name); | |
02205a67 TZ |
3021 | return ERR_PTR(ret); |
3022 | } | |
3023 | ||
3024 | kfree(cmd); | |
3025 | ||
3026 | /* If we can't find the variable, something went wrong */ | |
3027 | event_var = find_synthetic_field_var(target_hist_data, subsys_name, | |
3028 | event_name, field_name); | |
3029 | if (IS_ERR_OR_NULL(event_var)) { | |
3030 | kfree(var_hist->cmd); | |
3031 | kfree(var_hist); | |
f404da6e TZ |
3032 | hist_err_event("onmatch: Couldn't find synthetic variable: ", |
3033 | subsys_name, event_name, field_name); | |
02205a67 TZ |
3034 | return ERR_PTR(-EINVAL); |
3035 | } | |
3036 | ||
3037 | n = target_hist_data->n_field_var_hists; | |
3038 | target_hist_data->field_var_hists[n] = var_hist; | |
3039 | target_hist_data->n_field_var_hists++; | |
3040 | ||
3041 | return event_var; | |
3042 | } | |
3043 | ||
c282a386 | 3044 | static struct hist_field * |
02205a67 TZ |
3045 | find_target_event_var(struct hist_trigger_data *hist_data, |
3046 | char *subsys_name, char *event_name, char *var_name) | |
3047 | { | |
3048 | struct trace_event_file *file = hist_data->event_file; | |
3049 | struct hist_field *hist_field = NULL; | |
3050 | ||
3051 | if (subsys_name) { | |
3052 | struct trace_event_call *call; | |
3053 | ||
3054 | if (!event_name) | |
3055 | return NULL; | |
3056 | ||
3057 | call = file->event_call; | |
3058 | ||
3059 | if (strcmp(subsys_name, call->class->system) != 0) | |
3060 | return NULL; | |
3061 | ||
3062 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3063 | return NULL; | |
3064 | } | |
3065 | ||
3066 | hist_field = find_var_field(hist_data, var_name); | |
3067 | ||
3068 | return hist_field; | |
3069 | } | |
3070 | ||
3071 | static inline void __update_field_vars(struct tracing_map_elt *elt, | |
3072 | struct ring_buffer_event *rbe, | |
3073 | void *rec, | |
3074 | struct field_var **field_vars, | |
3075 | unsigned int n_field_vars, | |
3076 | unsigned int field_var_str_start) | |
3077 | { | |
3078 | struct hist_elt_data *elt_data = elt->private_data; | |
3079 | unsigned int i, j, var_idx; | |
3080 | u64 var_val; | |
3081 | ||
3082 | for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { | |
3083 | struct field_var *field_var = field_vars[i]; | |
3084 | struct hist_field *var = field_var->var; | |
3085 | struct hist_field *val = field_var->val; | |
3086 | ||
3087 | var_val = val->fn(val, elt, rbe, rec); | |
3088 | var_idx = var->var.idx; | |
3089 | ||
3090 | if (val->flags & HIST_FIELD_FL_STRING) { | |
3091 | char *str = elt_data->field_var_str[j++]; | |
3092 | char *val_str = (char *)(uintptr_t)var_val; | |
3093 | ||
ad452870 | 3094 | strscpy(str, val_str, STR_VAR_LEN_MAX); |
02205a67 TZ |
3095 | var_val = (u64)(uintptr_t)str; |
3096 | } | |
3097 | tracing_map_set_var(elt, var_idx, var_val); | |
3098 | } | |
3099 | } | |
3100 | ||
3101 | static void update_field_vars(struct hist_trigger_data *hist_data, | |
3102 | struct tracing_map_elt *elt, | |
3103 | struct ring_buffer_event *rbe, | |
3104 | void *rec) | |
3105 | { | |
3106 | __update_field_vars(elt, rbe, rec, hist_data->field_vars, | |
3107 | hist_data->n_field_vars, 0); | |
3108 | } | |
3109 | ||
50450603 TZ |
3110 | static void update_max_vars(struct hist_trigger_data *hist_data, |
3111 | struct tracing_map_elt *elt, | |
3112 | struct ring_buffer_event *rbe, | |
3113 | void *rec) | |
3114 | { | |
3115 | __update_field_vars(elt, rbe, rec, hist_data->max_vars, | |
3116 | hist_data->n_max_vars, hist_data->n_field_var_str); | |
3117 | } | |
3118 | ||
02205a67 TZ |
3119 | static struct hist_field *create_var(struct hist_trigger_data *hist_data, |
3120 | struct trace_event_file *file, | |
3121 | char *name, int size, const char *type) | |
3122 | { | |
3123 | struct hist_field *var; | |
3124 | int idx; | |
3125 | ||
3126 | if (find_var(hist_data, file, name) && !hist_data->remove) { | |
3127 | var = ERR_PTR(-EINVAL); | |
3128 | goto out; | |
3129 | } | |
3130 | ||
3131 | var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); | |
3132 | if (!var) { | |
3133 | var = ERR_PTR(-ENOMEM); | |
3134 | goto out; | |
3135 | } | |
3136 | ||
3137 | idx = tracing_map_add_var(hist_data->map); | |
3138 | if (idx < 0) { | |
3139 | kfree(var); | |
3140 | var = ERR_PTR(-EINVAL); | |
3141 | goto out; | |
3142 | } | |
3143 | ||
3144 | var->flags = HIST_FIELD_FL_VAR; | |
3145 | var->var.idx = idx; | |
3146 | var->var.hist_data = var->hist_data = hist_data; | |
3147 | var->size = size; | |
3148 | var->var.name = kstrdup(name, GFP_KERNEL); | |
3149 | var->type = kstrdup(type, GFP_KERNEL); | |
3150 | if (!var->var.name || !var->type) { | |
3151 | kfree(var->var.name); | |
3152 | kfree(var->type); | |
3153 | kfree(var); | |
3154 | var = ERR_PTR(-ENOMEM); | |
3155 | } | |
3156 | out: | |
3157 | return var; | |
3158 | } | |
3159 | ||
3160 | static struct field_var *create_field_var(struct hist_trigger_data *hist_data, | |
3161 | struct trace_event_file *file, | |
3162 | char *field_name) | |
3163 | { | |
3164 | struct hist_field *val = NULL, *var = NULL; | |
3165 | unsigned long flags = HIST_FIELD_FL_VAR; | |
3166 | struct field_var *field_var; | |
3167 | int ret = 0; | |
3168 | ||
3169 | if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { | |
f404da6e | 3170 | hist_err("Too many field variables defined: ", field_name); |
02205a67 TZ |
3171 | ret = -EINVAL; |
3172 | goto err; | |
3173 | } | |
3174 | ||
3175 | val = parse_atom(hist_data, file, field_name, &flags, NULL); | |
3176 | if (IS_ERR(val)) { | |
f404da6e | 3177 | hist_err("Couldn't parse field variable: ", field_name); |
02205a67 TZ |
3178 | ret = PTR_ERR(val); |
3179 | goto err; | |
3180 | } | |
3181 | ||
3182 | var = create_var(hist_data, file, field_name, val->size, val->type); | |
3183 | if (IS_ERR(var)) { | |
f404da6e | 3184 | hist_err("Couldn't create or find variable: ", field_name); |
02205a67 TZ |
3185 | kfree(val); |
3186 | ret = PTR_ERR(var); | |
3187 | goto err; | |
3188 | } | |
3189 | ||
3190 | field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); | |
3191 | if (!field_var) { | |
3192 | kfree(val); | |
3193 | kfree(var); | |
3194 | ret = -ENOMEM; | |
3195 | goto err; | |
3196 | } | |
3197 | ||
3198 | field_var->var = var; | |
3199 | field_var->val = val; | |
3200 | out: | |
3201 | return field_var; | |
3202 | err: | |
3203 | field_var = ERR_PTR(ret); | |
3204 | goto out; | |
3205 | } | |
3206 | ||
3207 | /** | |
3208 | * create_target_field_var - Automatically create a variable for a field | |
3209 | * @target_hist_data: The target hist trigger | |
3210 | * @subsys_name: Optional subsystem name | |
3211 | * @event_name: Optional event name | |
3212 | * @var_name: The name of the field (and the resulting variable) | |
3213 | * | |
3214 | * Hist trigger actions fetch data from variables, not directly from | |
3215 | * events. However, for convenience, users are allowed to directly | |
3216 | * specify an event field in an action, which will be automatically | |
3217 | * converted into a variable on their behalf. | |
3218 | ||
3219 | * This function creates a field variable with the name var_name on | |
3220 | * the hist trigger currently being defined on the target event. If | |
3221 | * subsys_name and event_name are specified, this function simply | |
3222 | * verifies that they do in fact match the target event subsystem and | |
3223 | * event name. | |
3224 | * | |
3225 | * Return: The variable created for the field. | |
3226 | */ | |
c282a386 | 3227 | static struct field_var * |
02205a67 TZ |
3228 | create_target_field_var(struct hist_trigger_data *target_hist_data, |
3229 | char *subsys_name, char *event_name, char *var_name) | |
3230 | { | |
3231 | struct trace_event_file *file = target_hist_data->event_file; | |
3232 | ||
3233 | if (subsys_name) { | |
3234 | struct trace_event_call *call; | |
3235 | ||
3236 | if (!event_name) | |
3237 | return NULL; | |
3238 | ||
3239 | call = file->event_call; | |
3240 | ||
3241 | if (strcmp(subsys_name, call->class->system) != 0) | |
3242 | return NULL; | |
3243 | ||
3244 | if (strcmp(event_name, trace_event_name(call)) != 0) | |
3245 | return NULL; | |
3246 | } | |
3247 | ||
3248 | return create_field_var(target_hist_data, file, var_name); | |
3249 | } | |
3250 | ||
50450603 TZ |
3251 | static void onmax_print(struct seq_file *m, |
3252 | struct hist_trigger_data *hist_data, | |
3253 | struct tracing_map_elt *elt, | |
3254 | struct action_data *data) | |
3255 | { | |
3256 | unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx; | |
3257 | ||
3258 | seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx)); | |
3259 | ||
3260 | for (i = 0; i < hist_data->n_max_vars; i++) { | |
3261 | struct hist_field *save_val = hist_data->max_vars[i]->val; | |
3262 | struct hist_field *save_var = hist_data->max_vars[i]->var; | |
3263 | u64 val; | |
3264 | ||
3265 | save_var_idx = save_var->var.idx; | |
3266 | ||
3267 | val = tracing_map_read_var(elt, save_var_idx); | |
3268 | ||
3269 | if (save_val->flags & HIST_FIELD_FL_STRING) { | |
3270 | seq_printf(m, " %s: %-32s", save_var->var.name, | |
3271 | (char *)(uintptr_t)(val)); | |
3272 | } else | |
3273 | seq_printf(m, " %s: %10llu", save_var->var.name, val); | |
3274 | } | |
3275 | } | |
3276 | ||
3277 | static void onmax_save(struct hist_trigger_data *hist_data, | |
3278 | struct tracing_map_elt *elt, void *rec, | |
3279 | struct ring_buffer_event *rbe, | |
3280 | struct action_data *data, u64 *var_ref_vals) | |
3281 | { | |
3282 | unsigned int max_idx = data->onmax.max_var->var.idx; | |
3283 | unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx; | |
3284 | ||
3285 | u64 var_val, max_val; | |
3286 | ||
3287 | var_val = var_ref_vals[max_var_ref_idx]; | |
3288 | max_val = tracing_map_read_var(elt, max_idx); | |
3289 | ||
3290 | if (var_val <= max_val) | |
3291 | return; | |
3292 | ||
3293 | tracing_map_set_var(elt, max_idx, var_val); | |
3294 | ||
3295 | update_max_vars(hist_data, elt, rbe, rec); | |
3296 | } | |
3297 | ||
3298 | static void onmax_destroy(struct action_data *data) | |
3299 | { | |
3300 | unsigned int i; | |
3301 | ||
3302 | destroy_hist_field(data->onmax.max_var, 0); | |
3303 | destroy_hist_field(data->onmax.var, 0); | |
3304 | ||
3305 | kfree(data->onmax.var_str); | |
3306 | kfree(data->onmax.fn_name); | |
3307 | ||
3308 | for (i = 0; i < data->n_params; i++) | |
3309 | kfree(data->params[i]); | |
3310 | ||
3311 | kfree(data); | |
3312 | } | |
3313 | ||
3314 | static int onmax_create(struct hist_trigger_data *hist_data, | |
3315 | struct action_data *data) | |
3316 | { | |
3317 | struct trace_event_file *file = hist_data->event_file; | |
3318 | struct hist_field *var_field, *ref_field, *max_var; | |
3319 | unsigned int var_ref_idx = hist_data->n_var_refs; | |
3320 | struct field_var *field_var; | |
3321 | char *onmax_var_str, *param; | |
3322 | unsigned long flags; | |
3323 | unsigned int i; | |
3324 | int ret = 0; | |
3325 | ||
3326 | onmax_var_str = data->onmax.var_str; | |
f404da6e TZ |
3327 | if (onmax_var_str[0] != '$') { |
3328 | hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str); | |
50450603 | 3329 | return -EINVAL; |
f404da6e | 3330 | } |
50450603 TZ |
3331 | onmax_var_str++; |
3332 | ||
3333 | var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str); | |
f404da6e TZ |
3334 | if (!var_field) { |
3335 | hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str); | |
50450603 | 3336 | return -EINVAL; |
f404da6e | 3337 | } |
50450603 TZ |
3338 | |
3339 | flags = HIST_FIELD_FL_VAR_REF; | |
3340 | ref_field = create_hist_field(hist_data, NULL, flags, NULL); | |
3341 | if (!ref_field) | |
3342 | return -ENOMEM; | |
3343 | ||
3344 | if (init_var_ref(ref_field, var_field, NULL, NULL)) { | |
3345 | destroy_hist_field(ref_field, 0); | |
3346 | ret = -ENOMEM; | |
3347 | goto out; | |
3348 | } | |
3349 | hist_data->var_refs[hist_data->n_var_refs] = ref_field; | |
3350 | ref_field->var_ref_idx = hist_data->n_var_refs++; | |
3351 | data->onmax.var = ref_field; | |
3352 | ||
3353 | data->fn = onmax_save; | |
3354 | data->onmax.max_var_ref_idx = var_ref_idx; | |
3355 | max_var = create_var(hist_data, file, "max", sizeof(u64), "u64"); | |
3356 | if (IS_ERR(max_var)) { | |
f404da6e | 3357 | hist_err("onmax: Couldn't create onmax variable: ", "max"); |
50450603 TZ |
3358 | ret = PTR_ERR(max_var); |
3359 | goto out; | |
3360 | } | |
3361 | data->onmax.max_var = max_var; | |
3362 | ||
3363 | for (i = 0; i < data->n_params; i++) { | |
3364 | param = kstrdup(data->params[i], GFP_KERNEL); | |
3365 | if (!param) { | |
3366 | ret = -ENOMEM; | |
3367 | goto out; | |
3368 | } | |
3369 | ||
3370 | field_var = create_target_field_var(hist_data, NULL, NULL, param); | |
3371 | if (IS_ERR(field_var)) { | |
f404da6e | 3372 | hist_err("onmax: Couldn't create field variable: ", param); |
50450603 TZ |
3373 | ret = PTR_ERR(field_var); |
3374 | kfree(param); | |
3375 | goto out; | |
3376 | } | |
3377 | ||
3378 | hist_data->max_vars[hist_data->n_max_vars++] = field_var; | |
3379 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
3380 | hist_data->n_max_var_str++; | |
3381 | ||
3382 | kfree(param); | |
3383 | } | |
3384 | out: | |
3385 | return ret; | |
3386 | } | |
3387 | ||
3388 | static int parse_action_params(char *params, struct action_data *data) | |
3389 | { | |
3390 | char *param, *saved_param; | |
3391 | int ret = 0; | |
3392 | ||
3393 | while (params) { | |
3394 | if (data->n_params >= SYNTH_FIELDS_MAX) | |
3395 | goto out; | |
3396 | ||
3397 | param = strsep(¶ms, ","); | |
3398 | if (!param) { | |
3399 | ret = -EINVAL; | |
3400 | goto out; | |
3401 | } | |
3402 | ||
3403 | param = strstrip(param); | |
3404 | if (strlen(param) < 2) { | |
f404da6e | 3405 | hist_err("Invalid action param: ", param); |
50450603 TZ |
3406 | ret = -EINVAL; |
3407 | goto out; | |
3408 | } | |
3409 | ||
3410 | saved_param = kstrdup(param, GFP_KERNEL); | |
3411 | if (!saved_param) { | |
3412 | ret = -ENOMEM; | |
3413 | goto out; | |
3414 | } | |
3415 | ||
3416 | data->params[data->n_params++] = saved_param; | |
3417 | } | |
3418 | out: | |
3419 | return ret; | |
3420 | } | |
3421 | ||
3422 | static struct action_data *onmax_parse(char *str) | |
3423 | { | |
3424 | char *onmax_fn_name, *onmax_var_str; | |
3425 | struct action_data *data; | |
3426 | int ret = -EINVAL; | |
3427 | ||
3428 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
3429 | if (!data) | |
3430 | return ERR_PTR(-ENOMEM); | |
3431 | ||
3432 | onmax_var_str = strsep(&str, ")"); | |
3433 | if (!onmax_var_str || !str) { | |
3434 | ret = -EINVAL; | |
3435 | goto free; | |
3436 | } | |
3437 | ||
3438 | data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL); | |
3439 | if (!data->onmax.var_str) { | |
3440 | ret = -ENOMEM; | |
3441 | goto free; | |
3442 | } | |
3443 | ||
3444 | strsep(&str, "."); | |
3445 | if (!str) | |
3446 | goto free; | |
3447 | ||
3448 | onmax_fn_name = strsep(&str, "("); | |
3449 | if (!onmax_fn_name || !str) | |
3450 | goto free; | |
3451 | ||
3452 | if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) { | |
3453 | char *params = strsep(&str, ")"); | |
3454 | ||
3455 | if (!params) { | |
3456 | ret = -EINVAL; | |
3457 | goto free; | |
3458 | } | |
3459 | ||
3460 | ret = parse_action_params(params, data); | |
3461 | if (ret) | |
3462 | goto free; | |
3463 | } else | |
3464 | goto free; | |
3465 | ||
3466 | data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL); | |
3467 | if (!data->onmax.fn_name) { | |
3468 | ret = -ENOMEM; | |
3469 | goto free; | |
3470 | } | |
3471 | out: | |
3472 | return data; | |
3473 | free: | |
3474 | onmax_destroy(data); | |
3475 | data = ERR_PTR(ret); | |
3476 | goto out; | |
3477 | } | |
3478 | ||
c282a386 TZ |
3479 | static void onmatch_destroy(struct action_data *data) |
3480 | { | |
3481 | unsigned int i; | |
3482 | ||
3483 | mutex_lock(&synth_event_mutex); | |
3484 | ||
3485 | kfree(data->onmatch.match_event); | |
3486 | kfree(data->onmatch.match_event_system); | |
3487 | kfree(data->onmatch.synth_event_name); | |
3488 | ||
3489 | for (i = 0; i < data->n_params; i++) | |
3490 | kfree(data->params[i]); | |
3491 | ||
3492 | if (data->onmatch.synth_event) | |
3493 | data->onmatch.synth_event->ref--; | |
3494 | ||
3495 | kfree(data); | |
3496 | ||
3497 | mutex_unlock(&synth_event_mutex); | |
3498 | } | |
3499 | ||
02205a67 TZ |
3500 | static void destroy_field_var(struct field_var *field_var) |
3501 | { | |
3502 | if (!field_var) | |
3503 | return; | |
3504 | ||
3505 | destroy_hist_field(field_var->var, 0); | |
3506 | destroy_hist_field(field_var->val, 0); | |
3507 | ||
3508 | kfree(field_var); | |
3509 | } | |
3510 | ||
3511 | static void destroy_field_vars(struct hist_trigger_data *hist_data) | |
3512 | { | |
3513 | unsigned int i; | |
3514 | ||
3515 | for (i = 0; i < hist_data->n_field_vars; i++) | |
3516 | destroy_field_var(hist_data->field_vars[i]); | |
3517 | } | |
3518 | ||
c282a386 TZ |
3519 | static void save_field_var(struct hist_trigger_data *hist_data, |
3520 | struct field_var *field_var) | |
02205a67 TZ |
3521 | { |
3522 | hist_data->field_vars[hist_data->n_field_vars++] = field_var; | |
3523 | ||
3524 | if (field_var->val->flags & HIST_FIELD_FL_STRING) | |
3525 | hist_data->n_field_var_str++; | |
3526 | } | |
3527 | ||
c282a386 TZ |
3528 | |
3529 | static void destroy_synth_var_refs(struct hist_trigger_data *hist_data) | |
3530 | { | |
3531 | unsigned int i; | |
3532 | ||
3533 | for (i = 0; i < hist_data->n_synth_var_refs; i++) | |
3534 | destroy_hist_field(hist_data->synth_var_refs[i], 0); | |
3535 | } | |
3536 | ||
3537 | static void save_synth_var_ref(struct hist_trigger_data *hist_data, | |
3538 | struct hist_field *var_ref) | |
3539 | { | |
3540 | hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref; | |
3541 | ||
3542 | hist_data->var_refs[hist_data->n_var_refs] = var_ref; | |
3543 | var_ref->var_ref_idx = hist_data->n_var_refs++; | |
3544 | } | |
3545 | ||
3546 | static int check_synth_field(struct synth_event *event, | |
3547 | struct hist_field *hist_field, | |
3548 | unsigned int field_pos) | |
3549 | { | |
3550 | struct synth_field *field; | |
3551 | ||
3552 | if (field_pos >= event->n_fields) | |
3553 | return -EINVAL; | |
3554 | ||
3555 | field = event->fields[field_pos]; | |
3556 | ||
3557 | if (strcmp(field->type, hist_field->type) != 0) | |
3558 | return -EINVAL; | |
3559 | ||
3560 | return 0; | |
3561 | } | |
3562 | ||
c282a386 TZ |
3563 | static struct hist_field * |
3564 | onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, | |
3565 | char *system, char *event, char *var) | |
3566 | { | |
3567 | struct hist_field *hist_field; | |
3568 | ||
3569 | var++; /* skip '$' */ | |
3570 | ||
3571 | hist_field = find_target_event_var(hist_data, system, event, var); | |
3572 | if (!hist_field) { | |
3573 | if (!system) { | |
3574 | system = data->onmatch.match_event_system; | |
3575 | event = data->onmatch.match_event; | |
3576 | } | |
3577 | ||
3578 | hist_field = find_event_var(hist_data, system, event, var); | |
3579 | } | |
3580 | ||
f404da6e TZ |
3581 | if (!hist_field) |
3582 | hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var); | |
3583 | ||
c282a386 TZ |
3584 | return hist_field; |
3585 | } | |
3586 | ||
3587 | static struct hist_field * | |
3588 | onmatch_create_field_var(struct hist_trigger_data *hist_data, | |
3589 | struct action_data *data, char *system, | |
3590 | char *event, char *var) | |
3591 | { | |
3592 | struct hist_field *hist_field = NULL; | |
3593 | struct field_var *field_var; | |
3594 | ||
3595 | /* | |
3596 | * First try to create a field var on the target event (the | |
3597 | * currently being defined). This will create a variable for | |
3598 | * unqualified fields on the target event, or if qualified, | |
3599 | * target fields that have qualified names matching the target. | |
3600 | */ | |
3601 | field_var = create_target_field_var(hist_data, system, event, var); | |
3602 | ||
3603 | if (field_var && !IS_ERR(field_var)) { | |
3604 | save_field_var(hist_data, field_var); | |
3605 | hist_field = field_var->var; | |
3606 | } else { | |
3607 | field_var = NULL; | |
3608 | /* | |
3609 | * If no explicit system.event is specfied, default to | |
3610 | * looking for fields on the onmatch(system.event.xxx) | |
3611 | * event. | |
3612 | */ | |
3613 | if (!system) { | |
3614 | system = data->onmatch.match_event_system; | |
3615 | event = data->onmatch.match_event; | |
3616 | } | |
3617 | ||
3618 | /* | |
3619 | * At this point, we're looking at a field on another | |
3620 | * event. Because we can't modify a hist trigger on | |
3621 | * another event to add a variable for a field, we need | |
3622 | * to create a new trigger on that event and create the | |
3623 | * variable at the same time. | |
3624 | */ | |
3625 | hist_field = create_field_var_hist(hist_data, system, event, var); | |
3626 | if (IS_ERR(hist_field)) | |
3627 | goto free; | |
3628 | } | |
3629 | out: | |
3630 | return hist_field; | |
3631 | free: | |
3632 | destroy_field_var(field_var); | |
3633 | hist_field = NULL; | |
3634 | goto out; | |
3635 | } | |
3636 | ||
3637 | static int onmatch_create(struct hist_trigger_data *hist_data, | |
3638 | struct trace_event_file *file, | |
3639 | struct action_data *data) | |
3640 | { | |
3641 | char *event_name, *param, *system = NULL; | |
3642 | struct hist_field *hist_field, *var_ref; | |
3643 | unsigned int i, var_ref_idx; | |
3644 | unsigned int field_pos = 0; | |
3645 | struct synth_event *event; | |
3646 | int ret = 0; | |
3647 | ||
3648 | mutex_lock(&synth_event_mutex); | |
3649 | event = find_synth_event(data->onmatch.synth_event_name); | |
3650 | if (!event) { | |
f404da6e | 3651 | hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name); |
c282a386 TZ |
3652 | mutex_unlock(&synth_event_mutex); |
3653 | return -EINVAL; | |
3654 | } | |
3655 | event->ref++; | |
3656 | mutex_unlock(&synth_event_mutex); | |
3657 | ||
3658 | var_ref_idx = hist_data->n_var_refs; | |
3659 | ||
3660 | for (i = 0; i < data->n_params; i++) { | |
3661 | char *p; | |
3662 | ||
3663 | p = param = kstrdup(data->params[i], GFP_KERNEL); | |
3664 | if (!param) { | |
3665 | ret = -ENOMEM; | |
3666 | goto err; | |
3667 | } | |
3668 | ||
3669 | system = strsep(¶m, "."); | |
3670 | if (!param) { | |
3671 | param = (char *)system; | |
3672 | system = event_name = NULL; | |
3673 | } else { | |
3674 | event_name = strsep(¶m, "."); | |
3675 | if (!param) { | |
3676 | kfree(p); | |
3677 | ret = -EINVAL; | |
3678 | goto err; | |
3679 | } | |
3680 | } | |
3681 | ||
3682 | if (param[0] == '$') | |
3683 | hist_field = onmatch_find_var(hist_data, data, system, | |
3684 | event_name, param); | |
3685 | else | |
3686 | hist_field = onmatch_create_field_var(hist_data, data, | |
3687 | system, | |
3688 | event_name, | |
3689 | param); | |
3690 | ||
3691 | if (!hist_field) { | |
3692 | kfree(p); | |
3693 | ret = -EINVAL; | |
3694 | goto err; | |
3695 | } | |
3696 | ||
3697 | if (check_synth_field(event, hist_field, field_pos) == 0) { | |
3698 | var_ref = create_var_ref(hist_field, system, event_name); | |
3699 | if (!var_ref) { | |
3700 | kfree(p); | |
3701 | ret = -ENOMEM; | |
3702 | goto err; | |
3703 | } | |
3704 | ||
3705 | save_synth_var_ref(hist_data, var_ref); | |
3706 | field_pos++; | |
3707 | kfree(p); | |
3708 | continue; | |
3709 | } | |
3710 | ||
f404da6e TZ |
3711 | hist_err_event("onmatch: Param type doesn't match synthetic event field type: ", |
3712 | system, event_name, param); | |
c282a386 TZ |
3713 | kfree(p); |
3714 | ret = -EINVAL; | |
3715 | goto err; | |
3716 | } | |
3717 | ||
3718 | if (field_pos != event->n_fields) { | |
f404da6e | 3719 | hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name); |
c282a386 TZ |
3720 | ret = -EINVAL; |
3721 | goto err; | |
3722 | } | |
3723 | ||
3724 | data->fn = action_trace; | |
3725 | data->onmatch.synth_event = event; | |
3726 | data->onmatch.var_ref_idx = var_ref_idx; | |
3727 | out: | |
3728 | return ret; | |
3729 | err: | |
3730 | mutex_lock(&synth_event_mutex); | |
3731 | event->ref--; | |
3732 | mutex_unlock(&synth_event_mutex); | |
3733 | ||
3734 | goto out; | |
3735 | } | |
3736 | ||
3737 | static struct action_data *onmatch_parse(struct trace_array *tr, char *str) | |
3738 | { | |
3739 | char *match_event, *match_event_system; | |
3740 | char *synth_event_name, *params; | |
3741 | struct action_data *data; | |
3742 | int ret = -EINVAL; | |
3743 | ||
3744 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
3745 | if (!data) | |
3746 | return ERR_PTR(-ENOMEM); | |
3747 | ||
3748 | match_event = strsep(&str, ")"); | |
f404da6e TZ |
3749 | if (!match_event || !str) { |
3750 | hist_err("onmatch: Missing closing paren: ", match_event); | |
c282a386 | 3751 | goto free; |
f404da6e | 3752 | } |
c282a386 TZ |
3753 | |
3754 | match_event_system = strsep(&match_event, "."); | |
f404da6e TZ |
3755 | if (!match_event) { |
3756 | hist_err("onmatch: Missing subsystem for match event: ", match_event_system); | |
c282a386 | 3757 | goto free; |
f404da6e | 3758 | } |
c282a386 | 3759 | |
f404da6e TZ |
3760 | if (IS_ERR(event_file(tr, match_event_system, match_event))) { |
3761 | hist_err_event("onmatch: Invalid subsystem or event name: ", | |
3762 | match_event_system, match_event, NULL); | |
c282a386 | 3763 | goto free; |
f404da6e | 3764 | } |
c282a386 TZ |
3765 | |
3766 | data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL); | |
3767 | if (!data->onmatch.match_event) { | |
3768 | ret = -ENOMEM; | |
3769 | goto free; | |
3770 | } | |
3771 | ||
3772 | data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL); | |
3773 | if (!data->onmatch.match_event_system) { | |
3774 | ret = -ENOMEM; | |
3775 | goto free; | |
3776 | } | |
3777 | ||
3778 | strsep(&str, "."); | |
f404da6e TZ |
3779 | if (!str) { |
3780 | hist_err("onmatch: Missing . after onmatch(): ", str); | |
c282a386 | 3781 | goto free; |
f404da6e | 3782 | } |
c282a386 TZ |
3783 | |
3784 | synth_event_name = strsep(&str, "("); | |
f404da6e TZ |
3785 | if (!synth_event_name || !str) { |
3786 | hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name); | |
c282a386 | 3787 | goto free; |
f404da6e | 3788 | } |
c282a386 TZ |
3789 | |
3790 | data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL); | |
3791 | if (!data->onmatch.synth_event_name) { | |
3792 | ret = -ENOMEM; | |
3793 | goto free; | |
3794 | } | |
3795 | ||
3796 | params = strsep(&str, ")"); | |
f404da6e TZ |
3797 | if (!params || !str || (str && strlen(str))) { |
3798 | hist_err("onmatch: Missing closing paramlist paren: ", params); | |
c282a386 | 3799 | goto free; |
f404da6e | 3800 | } |
c282a386 TZ |
3801 | |
3802 | ret = parse_action_params(params, data); | |
3803 | if (ret) | |
3804 | goto free; | |
3805 | out: | |
3806 | return data; | |
3807 | free: | |
3808 | onmatch_destroy(data); | |
3809 | data = ERR_PTR(ret); | |
3810 | goto out; | |
3811 | } | |
3812 | ||
7ef224d1 TZ |
3813 | static int create_hitcount_val(struct hist_trigger_data *hist_data) |
3814 | { | |
3815 | hist_data->fields[HITCOUNT_IDX] = | |
30350d65 | 3816 | create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); |
7ef224d1 TZ |
3817 | if (!hist_data->fields[HITCOUNT_IDX]) |
3818 | return -ENOMEM; | |
3819 | ||
3820 | hist_data->n_vals++; | |
30350d65 | 3821 | hist_data->n_fields++; |
7ef224d1 TZ |
3822 | |
3823 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) | |
3824 | return -EINVAL; | |
3825 | ||
3826 | return 0; | |
3827 | } | |
3828 | ||
30350d65 TZ |
3829 | static int __create_val_field(struct hist_trigger_data *hist_data, |
3830 | unsigned int val_idx, | |
3831 | struct trace_event_file *file, | |
3832 | char *var_name, char *field_str, | |
3833 | unsigned long flags) | |
f2606835 | 3834 | { |
100719dc | 3835 | struct hist_field *hist_field; |
f2606835 TZ |
3836 | int ret = 0; |
3837 | ||
100719dc TZ |
3838 | hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0); |
3839 | if (IS_ERR(hist_field)) { | |
3840 | ret = PTR_ERR(hist_field); | |
f2606835 TZ |
3841 | goto out; |
3842 | } | |
3843 | ||
100719dc TZ |
3844 | hist_data->fields[val_idx] = hist_field; |
3845 | ||
f2606835 | 3846 | ++hist_data->n_vals; |
30350d65 | 3847 | ++hist_data->n_fields; |
f2606835 | 3848 | |
30350d65 | 3849 | if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) |
f2606835 TZ |
3850 | ret = -EINVAL; |
3851 | out: | |
3852 | return ret; | |
3853 | } | |
3854 | ||
30350d65 TZ |
3855 | static int create_val_field(struct hist_trigger_data *hist_data, |
3856 | unsigned int val_idx, | |
3857 | struct trace_event_file *file, | |
3858 | char *field_str) | |
3859 | { | |
3860 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) | |
3861 | return -EINVAL; | |
3862 | ||
3863 | return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); | |
3864 | } | |
3865 | ||
3866 | static int create_var_field(struct hist_trigger_data *hist_data, | |
3867 | unsigned int val_idx, | |
3868 | struct trace_event_file *file, | |
3869 | char *var_name, char *expr_str) | |
3870 | { | |
3871 | unsigned long flags = 0; | |
3872 | ||
3873 | if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) | |
3874 | return -EINVAL; | |
f404da6e | 3875 | |
30350d65 | 3876 | if (find_var(hist_data, file, var_name) && !hist_data->remove) { |
f404da6e | 3877 | hist_err("Variable already defined: ", var_name); |
30350d65 TZ |
3878 | return -EINVAL; |
3879 | } | |
3880 | ||
3881 | flags |= HIST_FIELD_FL_VAR; | |
3882 | hist_data->n_vars++; | |
3883 | if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) | |
3884 | return -EINVAL; | |
3885 | ||
3886 | return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); | |
3887 | } | |
3888 | ||
7ef224d1 TZ |
3889 | static int create_val_fields(struct hist_trigger_data *hist_data, |
3890 | struct trace_event_file *file) | |
3891 | { | |
f2606835 | 3892 | char *fields_str, *field_str; |
30350d65 | 3893 | unsigned int i, j = 1; |
7ef224d1 TZ |
3894 | int ret; |
3895 | ||
3896 | ret = create_hitcount_val(hist_data); | |
f2606835 TZ |
3897 | if (ret) |
3898 | goto out; | |
7ef224d1 | 3899 | |
f2606835 TZ |
3900 | fields_str = hist_data->attrs->vals_str; |
3901 | if (!fields_str) | |
3902 | goto out; | |
3903 | ||
3904 | strsep(&fields_str, "="); | |
3905 | if (!fields_str) | |
3906 | goto out; | |
3907 | ||
3908 | for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX && | |
3909 | j < TRACING_MAP_VALS_MAX; i++) { | |
3910 | field_str = strsep(&fields_str, ","); | |
3911 | if (!field_str) | |
3912 | break; | |
30350d65 | 3913 | |
f2606835 TZ |
3914 | if (strcmp(field_str, "hitcount") == 0) |
3915 | continue; | |
30350d65 | 3916 | |
f2606835 TZ |
3917 | ret = create_val_field(hist_data, j++, file, field_str); |
3918 | if (ret) | |
3919 | goto out; | |
3920 | } | |
30350d65 | 3921 | |
f2606835 TZ |
3922 | if (fields_str && (strcmp(fields_str, "hitcount") != 0)) |
3923 | ret = -EINVAL; | |
3924 | out: | |
7ef224d1 TZ |
3925 | return ret; |
3926 | } | |
3927 | ||
3928 | static int create_key_field(struct hist_trigger_data *hist_data, | |
3929 | unsigned int key_idx, | |
76a3b0c8 | 3930 | unsigned int key_offset, |
7ef224d1 TZ |
3931 | struct trace_event_file *file, |
3932 | char *field_str) | |
3933 | { | |
30350d65 | 3934 | struct hist_field *hist_field = NULL; |
100719dc | 3935 | |
7ef224d1 TZ |
3936 | unsigned long flags = 0; |
3937 | unsigned int key_size; | |
3938 | int ret = 0; | |
3939 | ||
30350d65 | 3940 | if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) |
7ef224d1 TZ |
3941 | return -EINVAL; |
3942 | ||
3943 | flags |= HIST_FIELD_FL_KEY; | |
3944 | ||
69a0200c TZ |
3945 | if (strcmp(field_str, "stacktrace") == 0) { |
3946 | flags |= HIST_FIELD_FL_STACKTRACE; | |
3947 | key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; | |
30350d65 | 3948 | hist_field = create_hist_field(hist_data, NULL, flags, NULL); |
69a0200c | 3949 | } else { |
100719dc TZ |
3950 | hist_field = parse_expr(hist_data, file, field_str, flags, |
3951 | NULL, 0); | |
3952 | if (IS_ERR(hist_field)) { | |
3953 | ret = PTR_ERR(hist_field); | |
3954 | goto out; | |
69a0200c TZ |
3955 | } |
3956 | ||
067fe038 | 3957 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF) { |
f404da6e | 3958 | hist_err("Using variable references as keys not supported: ", field_str); |
067fe038 TZ |
3959 | destroy_hist_field(hist_field, 0); |
3960 | ret = -EINVAL; | |
3961 | goto out; | |
3962 | } | |
3963 | ||
100719dc | 3964 | key_size = hist_field->size; |
7ef224d1 TZ |
3965 | } |
3966 | ||
100719dc | 3967 | hist_data->fields[key_idx] = hist_field; |
7ef224d1 TZ |
3968 | |
3969 | key_size = ALIGN(key_size, sizeof(u64)); | |
3970 | hist_data->fields[key_idx]->size = key_size; | |
76a3b0c8 | 3971 | hist_data->fields[key_idx]->offset = key_offset; |
100719dc | 3972 | |
76a3b0c8 | 3973 | hist_data->key_size += key_size; |
100719dc | 3974 | |
7ef224d1 TZ |
3975 | if (hist_data->key_size > HIST_KEY_SIZE_MAX) { |
3976 | ret = -EINVAL; | |
3977 | goto out; | |
3978 | } | |
3979 | ||
3980 | hist_data->n_keys++; | |
30350d65 | 3981 | hist_data->n_fields++; |
7ef224d1 TZ |
3982 | |
3983 | if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) | |
3984 | return -EINVAL; | |
3985 | ||
3986 | ret = key_size; | |
3987 | out: | |
3988 | return ret; | |
3989 | } | |
3990 | ||
3991 | static int create_key_fields(struct hist_trigger_data *hist_data, | |
3992 | struct trace_event_file *file) | |
3993 | { | |
76a3b0c8 | 3994 | unsigned int i, key_offset = 0, n_vals = hist_data->n_vals; |
7ef224d1 TZ |
3995 | char *fields_str, *field_str; |
3996 | int ret = -EINVAL; | |
3997 | ||
3998 | fields_str = hist_data->attrs->keys_str; | |
3999 | if (!fields_str) | |
4000 | goto out; | |
4001 | ||
4002 | strsep(&fields_str, "="); | |
4003 | if (!fields_str) | |
4004 | goto out; | |
4005 | ||
76a3b0c8 | 4006 | for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) { |
7ef224d1 TZ |
4007 | field_str = strsep(&fields_str, ","); |
4008 | if (!field_str) | |
4009 | break; | |
76a3b0c8 TZ |
4010 | ret = create_key_field(hist_data, i, key_offset, |
4011 | file, field_str); | |
7ef224d1 TZ |
4012 | if (ret < 0) |
4013 | goto out; | |
76a3b0c8 | 4014 | key_offset += ret; |
7ef224d1 TZ |
4015 | } |
4016 | if (fields_str) { | |
4017 | ret = -EINVAL; | |
4018 | goto out; | |
4019 | } | |
4020 | ret = 0; | |
4021 | out: | |
4022 | return ret; | |
4023 | } | |
4024 | ||
30350d65 TZ |
4025 | static int create_var_fields(struct hist_trigger_data *hist_data, |
4026 | struct trace_event_file *file) | |
4027 | { | |
4028 | unsigned int i, j = hist_data->n_vals; | |
4029 | int ret = 0; | |
4030 | ||
4031 | unsigned int n_vars = hist_data->attrs->var_defs.n_vars; | |
4032 | ||
4033 | for (i = 0; i < n_vars; i++) { | |
4034 | char *var_name = hist_data->attrs->var_defs.name[i]; | |
4035 | char *expr = hist_data->attrs->var_defs.expr[i]; | |
4036 | ||
4037 | ret = create_var_field(hist_data, j++, file, var_name, expr); | |
4038 | if (ret) | |
4039 | goto out; | |
4040 | } | |
4041 | out: | |
4042 | return ret; | |
4043 | } | |
4044 | ||
4045 | static void free_var_defs(struct hist_trigger_data *hist_data) | |
4046 | { | |
4047 | unsigned int i; | |
4048 | ||
4049 | for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { | |
4050 | kfree(hist_data->attrs->var_defs.name[i]); | |
4051 | kfree(hist_data->attrs->var_defs.expr[i]); | |
4052 | } | |
4053 | ||
4054 | hist_data->attrs->var_defs.n_vars = 0; | |
4055 | } | |
4056 | ||
4057 | static int parse_var_defs(struct hist_trigger_data *hist_data) | |
4058 | { | |
4059 | char *s, *str, *var_name, *field_str; | |
4060 | unsigned int i, j, n_vars = 0; | |
4061 | int ret = 0; | |
4062 | ||
4063 | for (i = 0; i < hist_data->attrs->n_assignments; i++) { | |
4064 | str = hist_data->attrs->assignment_str[i]; | |
4065 | for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { | |
4066 | field_str = strsep(&str, ","); | |
4067 | if (!field_str) | |
4068 | break; | |
4069 | ||
4070 | var_name = strsep(&field_str, "="); | |
4071 | if (!var_name || !field_str) { | |
f404da6e | 4072 | hist_err("Malformed assignment: ", var_name); |
30350d65 TZ |
4073 | ret = -EINVAL; |
4074 | goto free; | |
4075 | } | |
4076 | ||
4077 | if (n_vars == TRACING_MAP_VARS_MAX) { | |
f404da6e | 4078 | hist_err("Too many variables defined: ", var_name); |
30350d65 TZ |
4079 | ret = -EINVAL; |
4080 | goto free; | |
4081 | } | |
4082 | ||
4083 | s = kstrdup(var_name, GFP_KERNEL); | |
4084 | if (!s) { | |
4085 | ret = -ENOMEM; | |
4086 | goto free; | |
4087 | } | |
4088 | hist_data->attrs->var_defs.name[n_vars] = s; | |
4089 | ||
4090 | s = kstrdup(field_str, GFP_KERNEL); | |
4091 | if (!s) { | |
4092 | kfree(hist_data->attrs->var_defs.name[n_vars]); | |
4093 | ret = -ENOMEM; | |
4094 | goto free; | |
4095 | } | |
4096 | hist_data->attrs->var_defs.expr[n_vars++] = s; | |
4097 | ||
4098 | hist_data->attrs->var_defs.n_vars = n_vars; | |
4099 | } | |
4100 | } | |
4101 | ||
4102 | return ret; | |
4103 | free: | |
4104 | free_var_defs(hist_data); | |
4105 | ||
4106 | return ret; | |
4107 | } | |
4108 | ||
7ef224d1 TZ |
4109 | static int create_hist_fields(struct hist_trigger_data *hist_data, |
4110 | struct trace_event_file *file) | |
4111 | { | |
4112 | int ret; | |
4113 | ||
30350d65 TZ |
4114 | ret = parse_var_defs(hist_data); |
4115 | if (ret) | |
4116 | goto out; | |
4117 | ||
7ef224d1 TZ |
4118 | ret = create_val_fields(hist_data, file); |
4119 | if (ret) | |
4120 | goto out; | |
4121 | ||
30350d65 | 4122 | ret = create_var_fields(hist_data, file); |
7ef224d1 TZ |
4123 | if (ret) |
4124 | goto out; | |
4125 | ||
30350d65 TZ |
4126 | ret = create_key_fields(hist_data, file); |
4127 | if (ret) | |
4128 | goto out; | |
7ef224d1 | 4129 | out: |
30350d65 TZ |
4130 | free_var_defs(hist_data); |
4131 | ||
7ef224d1 TZ |
4132 | return ret; |
4133 | } | |
4134 | ||
e62347d2 TZ |
4135 | static int is_descending(const char *str) |
4136 | { | |
4137 | if (!str) | |
4138 | return 0; | |
4139 | ||
4140 | if (strcmp(str, "descending") == 0) | |
4141 | return 1; | |
4142 | ||
4143 | if (strcmp(str, "ascending") == 0) | |
4144 | return 0; | |
4145 | ||
4146 | return -EINVAL; | |
4147 | } | |
4148 | ||
7ef224d1 TZ |
4149 | static int create_sort_keys(struct hist_trigger_data *hist_data) |
4150 | { | |
e62347d2 | 4151 | char *fields_str = hist_data->attrs->sort_key_str; |
e62347d2 TZ |
4152 | struct tracing_map_sort_key *sort_key; |
4153 | int descending, ret = 0; | |
30350d65 | 4154 | unsigned int i, j, k; |
e62347d2 TZ |
4155 | |
4156 | hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ | |
4157 | ||
4158 | if (!fields_str) | |
4159 | goto out; | |
4160 | ||
4161 | strsep(&fields_str, "="); | |
4162 | if (!fields_str) { | |
4163 | ret = -EINVAL; | |
4164 | goto out; | |
4165 | } | |
4166 | ||
4167 | for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { | |
85013256 | 4168 | struct hist_field *hist_field; |
e62347d2 | 4169 | char *field_str, *field_name; |
85013256 | 4170 | const char *test_name; |
e62347d2 TZ |
4171 | |
4172 | sort_key = &hist_data->sort_keys[i]; | |
4173 | ||
4174 | field_str = strsep(&fields_str, ","); | |
4175 | if (!field_str) { | |
4176 | if (i == 0) | |
4177 | ret = -EINVAL; | |
4178 | break; | |
4179 | } | |
4180 | ||
4181 | if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) { | |
4182 | ret = -EINVAL; | |
4183 | break; | |
4184 | } | |
7ef224d1 | 4185 | |
e62347d2 TZ |
4186 | field_name = strsep(&field_str, "."); |
4187 | if (!field_name) { | |
4188 | ret = -EINVAL; | |
4189 | break; | |
4190 | } | |
4191 | ||
4192 | if (strcmp(field_name, "hitcount") == 0) { | |
4193 | descending = is_descending(field_str); | |
4194 | if (descending < 0) { | |
4195 | ret = descending; | |
4196 | break; | |
4197 | } | |
4198 | sort_key->descending = descending; | |
4199 | continue; | |
4200 | } | |
7ef224d1 | 4201 | |
30350d65 TZ |
4202 | for (j = 1, k = 1; j < hist_data->n_fields; j++) { |
4203 | unsigned int idx; | |
4204 | ||
85013256 | 4205 | hist_field = hist_data->fields[j]; |
30350d65 TZ |
4206 | if (hist_field->flags & HIST_FIELD_FL_VAR) |
4207 | continue; | |
4208 | ||
4209 | idx = k++; | |
4210 | ||
85013256 TZ |
4211 | test_name = hist_field_name(hist_field, 0); |
4212 | ||
4213 | if (strcmp(field_name, test_name) == 0) { | |
30350d65 | 4214 | sort_key->field_idx = idx; |
e62347d2 TZ |
4215 | descending = is_descending(field_str); |
4216 | if (descending < 0) { | |
4217 | ret = descending; | |
4218 | goto out; | |
4219 | } | |
4220 | sort_key->descending = descending; | |
4221 | break; | |
4222 | } | |
4223 | } | |
4224 | if (j == hist_data->n_fields) { | |
4225 | ret = -EINVAL; | |
4226 | break; | |
4227 | } | |
4228 | } | |
30350d65 | 4229 | |
e62347d2 TZ |
4230 | hist_data->n_sort_keys = i; |
4231 | out: | |
7ef224d1 TZ |
4232 | return ret; |
4233 | } | |
4234 | ||
0212e2aa TZ |
4235 | static void destroy_actions(struct hist_trigger_data *hist_data) |
4236 | { | |
4237 | unsigned int i; | |
4238 | ||
4239 | for (i = 0; i < hist_data->n_actions; i++) { | |
4240 | struct action_data *data = hist_data->actions[i]; | |
4241 | ||
c282a386 TZ |
4242 | if (data->fn == action_trace) |
4243 | onmatch_destroy(data); | |
50450603 TZ |
4244 | else if (data->fn == onmax_save) |
4245 | onmax_destroy(data); | |
c282a386 TZ |
4246 | else |
4247 | kfree(data); | |
0212e2aa TZ |
4248 | } |
4249 | } | |
4250 | ||
4251 | static int parse_actions(struct hist_trigger_data *hist_data) | |
4252 | { | |
c282a386 TZ |
4253 | struct trace_array *tr = hist_data->event_file->tr; |
4254 | struct action_data *data; | |
0212e2aa TZ |
4255 | unsigned int i; |
4256 | int ret = 0; | |
4257 | char *str; | |
4258 | ||
4259 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4260 | str = hist_data->attrs->action_str[i]; | |
c282a386 TZ |
4261 | |
4262 | if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) { | |
4263 | char *action_str = str + strlen("onmatch("); | |
4264 | ||
4265 | data = onmatch_parse(tr, action_str); | |
4266 | if (IS_ERR(data)) { | |
4267 | ret = PTR_ERR(data); | |
4268 | break; | |
4269 | } | |
4270 | data->fn = action_trace; | |
50450603 TZ |
4271 | } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) { |
4272 | char *action_str = str + strlen("onmax("); | |
4273 | ||
4274 | data = onmax_parse(action_str); | |
4275 | if (IS_ERR(data)) { | |
4276 | ret = PTR_ERR(data); | |
4277 | break; | |
4278 | } | |
4279 | data->fn = onmax_save; | |
c282a386 TZ |
4280 | } else { |
4281 | ret = -EINVAL; | |
4282 | break; | |
4283 | } | |
4284 | ||
4285 | hist_data->actions[hist_data->n_actions++] = data; | |
0212e2aa TZ |
4286 | } |
4287 | ||
4288 | return ret; | |
4289 | } | |
4290 | ||
4291 | static int create_actions(struct hist_trigger_data *hist_data, | |
4292 | struct trace_event_file *file) | |
4293 | { | |
4294 | struct action_data *data; | |
4295 | unsigned int i; | |
4296 | int ret = 0; | |
4297 | ||
4298 | for (i = 0; i < hist_data->attrs->n_actions; i++) { | |
4299 | data = hist_data->actions[i]; | |
c282a386 TZ |
4300 | |
4301 | if (data->fn == action_trace) { | |
4302 | ret = onmatch_create(hist_data, file, data); | |
4303 | if (ret) | |
4304 | return ret; | |
50450603 TZ |
4305 | } else if (data->fn == onmax_save) { |
4306 | ret = onmax_create(hist_data, data); | |
4307 | if (ret) | |
4308 | return ret; | |
c282a386 | 4309 | } |
0212e2aa TZ |
4310 | } |
4311 | ||
4312 | return ret; | |
4313 | } | |
4314 | ||
50450603 TZ |
4315 | static void print_actions(struct seq_file *m, |
4316 | struct hist_trigger_data *hist_data, | |
4317 | struct tracing_map_elt *elt) | |
4318 | { | |
4319 | unsigned int i; | |
4320 | ||
4321 | for (i = 0; i < hist_data->n_actions; i++) { | |
4322 | struct action_data *data = hist_data->actions[i]; | |
4323 | ||
4324 | if (data->fn == onmax_save) | |
4325 | onmax_print(m, hist_data, elt, data); | |
4326 | } | |
4327 | } | |
4328 | ||
4329 | static void print_onmax_spec(struct seq_file *m, | |
4330 | struct hist_trigger_data *hist_data, | |
4331 | struct action_data *data) | |
4332 | { | |
4333 | unsigned int i; | |
4334 | ||
4335 | seq_puts(m, ":onmax("); | |
4336 | seq_printf(m, "%s", data->onmax.var_str); | |
4337 | seq_printf(m, ").%s(", data->onmax.fn_name); | |
4338 | ||
4339 | for (i = 0; i < hist_data->n_max_vars; i++) { | |
4340 | seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name); | |
4341 | if (i < hist_data->n_max_vars - 1) | |
4342 | seq_puts(m, ","); | |
4343 | } | |
4344 | seq_puts(m, ")"); | |
4345 | } | |
4346 | ||
c282a386 TZ |
4347 | static void print_onmatch_spec(struct seq_file *m, |
4348 | struct hist_trigger_data *hist_data, | |
4349 | struct action_data *data) | |
4350 | { | |
4351 | unsigned int i; | |
4352 | ||
4353 | seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system, | |
4354 | data->onmatch.match_event); | |
4355 | ||
4356 | seq_printf(m, "%s(", data->onmatch.synth_event->name); | |
4357 | ||
4358 | for (i = 0; i < data->n_params; i++) { | |
4359 | if (i) | |
4360 | seq_puts(m, ","); | |
4361 | seq_printf(m, "%s", data->params[i]); | |
4362 | } | |
4363 | ||
4364 | seq_puts(m, ")"); | |
4365 | } | |
4366 | ||
48f79473 TZ |
4367 | static bool actions_match(struct hist_trigger_data *hist_data, |
4368 | struct hist_trigger_data *hist_data_test) | |
4369 | { | |
4370 | unsigned int i, j; | |
4371 | ||
4372 | if (hist_data->n_actions != hist_data_test->n_actions) | |
4373 | return false; | |
4374 | ||
4375 | for (i = 0; i < hist_data->n_actions; i++) { | |
4376 | struct action_data *data = hist_data->actions[i]; | |
4377 | struct action_data *data_test = hist_data_test->actions[i]; | |
4378 | ||
4379 | if (data->fn != data_test->fn) | |
4380 | return false; | |
4381 | ||
4382 | if (data->n_params != data_test->n_params) | |
4383 | return false; | |
4384 | ||
4385 | for (j = 0; j < data->n_params; j++) { | |
4386 | if (strcmp(data->params[j], data_test->params[j]) != 0) | |
4387 | return false; | |
4388 | } | |
4389 | ||
4390 | if (data->fn == action_trace) { | |
4391 | if (strcmp(data->onmatch.synth_event_name, | |
4392 | data_test->onmatch.synth_event_name) != 0) | |
4393 | return false; | |
4394 | if (strcmp(data->onmatch.match_event_system, | |
4395 | data_test->onmatch.match_event_system) != 0) | |
4396 | return false; | |
4397 | if (strcmp(data->onmatch.match_event, | |
4398 | data_test->onmatch.match_event) != 0) | |
4399 | return false; | |
4400 | } else if (data->fn == onmax_save) { | |
4401 | if (strcmp(data->onmax.var_str, | |
4402 | data_test->onmax.var_str) != 0) | |
4403 | return false; | |
4404 | if (strcmp(data->onmax.fn_name, | |
4405 | data_test->onmax.fn_name) != 0) | |
4406 | return false; | |
4407 | } | |
4408 | } | |
4409 | ||
4410 | return true; | |
4411 | } | |
4412 | ||
4413 | ||
c282a386 TZ |
4414 | static void print_actions_spec(struct seq_file *m, |
4415 | struct hist_trigger_data *hist_data) | |
4416 | { | |
4417 | unsigned int i; | |
4418 | ||
4419 | for (i = 0; i < hist_data->n_actions; i++) { | |
4420 | struct action_data *data = hist_data->actions[i]; | |
4421 | ||
4422 | if (data->fn == action_trace) | |
4423 | print_onmatch_spec(m, hist_data, data); | |
50450603 TZ |
4424 | else if (data->fn == onmax_save) |
4425 | print_onmax_spec(m, hist_data, data); | |
c282a386 TZ |
4426 | } |
4427 | } | |
4428 | ||
02205a67 TZ |
4429 | static void destroy_field_var_hists(struct hist_trigger_data *hist_data) |
4430 | { | |
4431 | unsigned int i; | |
4432 | ||
4433 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
4434 | kfree(hist_data->field_var_hists[i]->cmd); | |
4435 | kfree(hist_data->field_var_hists[i]); | |
4436 | } | |
4437 | } | |
4438 | ||
7ef224d1 TZ |
4439 | static void destroy_hist_data(struct hist_trigger_data *hist_data) |
4440 | { | |
0212e2aa TZ |
4441 | if (!hist_data) |
4442 | return; | |
4443 | ||
7ef224d1 TZ |
4444 | destroy_hist_trigger_attrs(hist_data->attrs); |
4445 | destroy_hist_fields(hist_data); | |
4446 | tracing_map_destroy(hist_data->map); | |
0212e2aa TZ |
4447 | |
4448 | destroy_actions(hist_data); | |
02205a67 TZ |
4449 | destroy_field_vars(hist_data); |
4450 | destroy_field_var_hists(hist_data); | |
c282a386 | 4451 | destroy_synth_var_refs(hist_data); |
0212e2aa | 4452 | |
7ef224d1 TZ |
4453 | kfree(hist_data); |
4454 | } | |
4455 | ||
4456 | static int create_tracing_map_fields(struct hist_trigger_data *hist_data) | |
4457 | { | |
4458 | struct tracing_map *map = hist_data->map; | |
4459 | struct ftrace_event_field *field; | |
4460 | struct hist_field *hist_field; | |
d50c744e | 4461 | int i, idx; |
7ef224d1 TZ |
4462 | |
4463 | for_each_hist_field(i, hist_data) { | |
4464 | hist_field = hist_data->fields[i]; | |
4465 | if (hist_field->flags & HIST_FIELD_FL_KEY) { | |
4466 | tracing_map_cmp_fn_t cmp_fn; | |
4467 | ||
4468 | field = hist_field->field; | |
4469 | ||
69a0200c TZ |
4470 | if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) |
4471 | cmp_fn = tracing_map_cmp_none; | |
ad42febe TZ |
4472 | else if (!field) |
4473 | cmp_fn = tracing_map_cmp_num(hist_field->size, | |
4474 | hist_field->is_signed); | |
69a0200c | 4475 | else if (is_string_field(field)) |
7ef224d1 TZ |
4476 | cmp_fn = tracing_map_cmp_string; |
4477 | else | |
4478 | cmp_fn = tracing_map_cmp_num(field->size, | |
4479 | field->is_signed); | |
76a3b0c8 TZ |
4480 | idx = tracing_map_add_key_field(map, |
4481 | hist_field->offset, | |
4482 | cmp_fn); | |
30350d65 | 4483 | } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) |
7ef224d1 TZ |
4484 | idx = tracing_map_add_sum_field(map); |
4485 | ||
4486 | if (idx < 0) | |
4487 | return idx; | |
30350d65 TZ |
4488 | |
4489 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
4490 | idx = tracing_map_add_var(map); | |
4491 | if (idx < 0) | |
4492 | return idx; | |
4493 | hist_field->var.idx = idx; | |
4494 | hist_field->var.hist_data = hist_data; | |
4495 | } | |
7ef224d1 TZ |
4496 | } |
4497 | ||
4498 | return 0; | |
4499 | } | |
4500 | ||
4501 | static struct hist_trigger_data * | |
4502 | create_hist_data(unsigned int map_bits, | |
4503 | struct hist_trigger_attrs *attrs, | |
30350d65 TZ |
4504 | struct trace_event_file *file, |
4505 | bool remove) | |
7ef224d1 | 4506 | { |
6b4827ad | 4507 | const struct tracing_map_ops *map_ops = NULL; |
7ef224d1 TZ |
4508 | struct hist_trigger_data *hist_data; |
4509 | int ret = 0; | |
4510 | ||
4511 | hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL); | |
4512 | if (!hist_data) | |
4513 | return ERR_PTR(-ENOMEM); | |
4514 | ||
4515 | hist_data->attrs = attrs; | |
30350d65 | 4516 | hist_data->remove = remove; |
067fe038 | 4517 | hist_data->event_file = file; |
7ef224d1 | 4518 | |
0212e2aa TZ |
4519 | ret = parse_actions(hist_data); |
4520 | if (ret) | |
4521 | goto free; | |
4522 | ||
7ef224d1 TZ |
4523 | ret = create_hist_fields(hist_data, file); |
4524 | if (ret) | |
4525 | goto free; | |
4526 | ||
4527 | ret = create_sort_keys(hist_data); | |
4528 | if (ret) | |
4529 | goto free; | |
4530 | ||
af6a29bc | 4531 | map_ops = &hist_trigger_elt_data_ops; |
6b4827ad | 4532 | |
7ef224d1 | 4533 | hist_data->map = tracing_map_create(map_bits, hist_data->key_size, |
6b4827ad | 4534 | map_ops, hist_data); |
7ef224d1 TZ |
4535 | if (IS_ERR(hist_data->map)) { |
4536 | ret = PTR_ERR(hist_data->map); | |
4537 | hist_data->map = NULL; | |
4538 | goto free; | |
4539 | } | |
4540 | ||
4541 | ret = create_tracing_map_fields(hist_data); | |
4542 | if (ret) | |
4543 | goto free; | |
7ef224d1 TZ |
4544 | out: |
4545 | return hist_data; | |
4546 | free: | |
4547 | hist_data->attrs = NULL; | |
4548 | ||
4549 | destroy_hist_data(hist_data); | |
4550 | ||
4551 | hist_data = ERR_PTR(ret); | |
4552 | ||
4553 | goto out; | |
4554 | } | |
4555 | ||
4556 | static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, | |
fbd302cb | 4557 | struct tracing_map_elt *elt, void *rec, |
067fe038 TZ |
4558 | struct ring_buffer_event *rbe, |
4559 | u64 *var_ref_vals) | |
7ef224d1 | 4560 | { |
067fe038 | 4561 | struct hist_elt_data *elt_data; |
7ef224d1 | 4562 | struct hist_field *hist_field; |
30350d65 | 4563 | unsigned int i, var_idx; |
7ef224d1 TZ |
4564 | u64 hist_val; |
4565 | ||
067fe038 TZ |
4566 | elt_data = elt->private_data; |
4567 | elt_data->var_ref_vals = var_ref_vals; | |
4568 | ||
7ef224d1 TZ |
4569 | for_each_hist_val_field(i, hist_data) { |
4570 | hist_field = hist_data->fields[i]; | |
df35d93b | 4571 | hist_val = hist_field->fn(hist_field, elt, rbe, rec); |
30350d65 TZ |
4572 | if (hist_field->flags & HIST_FIELD_FL_VAR) { |
4573 | var_idx = hist_field->var.idx; | |
4574 | tracing_map_set_var(elt, var_idx, hist_val); | |
4575 | continue; | |
4576 | } | |
7ef224d1 TZ |
4577 | tracing_map_update_sum(elt, i, hist_val); |
4578 | } | |
30350d65 TZ |
4579 | |
4580 | for_each_hist_key_field(i, hist_data) { | |
4581 | hist_field = hist_data->fields[i]; | |
4582 | if (hist_field->flags & HIST_FIELD_FL_VAR) { | |
df35d93b | 4583 | hist_val = hist_field->fn(hist_field, elt, rbe, rec); |
30350d65 TZ |
4584 | var_idx = hist_field->var.idx; |
4585 | tracing_map_set_var(elt, var_idx, hist_val); | |
4586 | } | |
4587 | } | |
02205a67 TZ |
4588 | |
4589 | update_field_vars(hist_data, elt, rbe, rec); | |
7ef224d1 TZ |
4590 | } |
4591 | ||
6a475cb1 TZ |
4592 | static inline void add_to_key(char *compound_key, void *key, |
4593 | struct hist_field *key_field, void *rec) | |
4594 | { | |
4595 | size_t size = key_field->size; | |
4596 | ||
4597 | if (key_field->flags & HIST_FIELD_FL_STRING) { | |
4598 | struct ftrace_event_field *field; | |
4599 | ||
4600 | field = key_field->field; | |
4601 | if (field->filter_type == FILTER_DYN_STRING) | |
4602 | size = *(u32 *)(rec + field->offset) >> 16; | |
4603 | else if (field->filter_type == FILTER_PTR_STRING) | |
4604 | size = strlen(key); | |
4605 | else if (field->filter_type == FILTER_STATIC_STRING) | |
4606 | size = field->size; | |
4607 | ||
4608 | /* ensure NULL-termination */ | |
4609 | if (size > key_field->size - 1) | |
4610 | size = key_field->size - 1; | |
4611 | } | |
4612 | ||
4613 | memcpy(compound_key + key_field->offset, key, size); | |
4614 | } | |
4615 | ||
0212e2aa TZ |
4616 | static void |
4617 | hist_trigger_actions(struct hist_trigger_data *hist_data, | |
4618 | struct tracing_map_elt *elt, void *rec, | |
4619 | struct ring_buffer_event *rbe, u64 *var_ref_vals) | |
4620 | { | |
4621 | struct action_data *data; | |
4622 | unsigned int i; | |
4623 | ||
4624 | for (i = 0; i < hist_data->n_actions; i++) { | |
4625 | data = hist_data->actions[i]; | |
4626 | data->fn(hist_data, elt, rec, rbe, data, var_ref_vals); | |
4627 | } | |
4628 | } | |
4629 | ||
1ac4f51c | 4630 | static void event_hist_trigger(struct event_trigger_data *data, void *rec, |
fbd302cb | 4631 | struct ring_buffer_event *rbe) |
7ef224d1 TZ |
4632 | { |
4633 | struct hist_trigger_data *hist_data = data->private_data; | |
6a475cb1 | 4634 | bool use_compound_key = (hist_data->n_keys > 1); |
69a0200c | 4635 | unsigned long entries[HIST_STACKTRACE_DEPTH]; |
067fe038 | 4636 | u64 var_ref_vals[TRACING_MAP_VARS_MAX]; |
76a3b0c8 | 4637 | char compound_key[HIST_KEY_SIZE_MAX]; |
df35d93b | 4638 | struct tracing_map_elt *elt = NULL; |
69a0200c | 4639 | struct stack_trace stacktrace; |
7ef224d1 | 4640 | struct hist_field *key_field; |
7ef224d1 TZ |
4641 | u64 field_contents; |
4642 | void *key = NULL; | |
4643 | unsigned int i; | |
4644 | ||
6a475cb1 | 4645 | memset(compound_key, 0, hist_data->key_size); |
76a3b0c8 | 4646 | |
7ef224d1 TZ |
4647 | for_each_hist_key_field(i, hist_data) { |
4648 | key_field = hist_data->fields[i]; | |
4649 | ||
69a0200c TZ |
4650 | if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
4651 | stacktrace.max_entries = HIST_STACKTRACE_DEPTH; | |
4652 | stacktrace.entries = entries; | |
4653 | stacktrace.nr_entries = 0; | |
4654 | stacktrace.skip = HIST_STACKTRACE_SKIP; | |
76a3b0c8 | 4655 | |
69a0200c TZ |
4656 | memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE); |
4657 | save_stack_trace(&stacktrace); | |
4658 | ||
4659 | key = entries; | |
4660 | } else { | |
df35d93b | 4661 | field_contents = key_field->fn(key_field, elt, rbe, rec); |
6a475cb1 | 4662 | if (key_field->flags & HIST_FIELD_FL_STRING) { |
69a0200c | 4663 | key = (void *)(unsigned long)field_contents; |
6a475cb1 TZ |
4664 | use_compound_key = true; |
4665 | } else | |
69a0200c | 4666 | key = (void *)&field_contents; |
76a3b0c8 | 4667 | } |
6a475cb1 TZ |
4668 | |
4669 | if (use_compound_key) | |
4670 | add_to_key(compound_key, key, key_field, rec); | |
7ef224d1 TZ |
4671 | } |
4672 | ||
6a475cb1 | 4673 | if (use_compound_key) |
76a3b0c8 TZ |
4674 | key = compound_key; |
4675 | ||
067fe038 TZ |
4676 | if (hist_data->n_var_refs && |
4677 | !resolve_var_refs(hist_data, key, var_ref_vals, false)) | |
4678 | return; | |
4679 | ||
7ef224d1 | 4680 | elt = tracing_map_insert(hist_data->map, key); |
067fe038 TZ |
4681 | if (!elt) |
4682 | return; | |
4683 | ||
4684 | hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals); | |
0212e2aa TZ |
4685 | |
4686 | if (resolve_var_refs(hist_data, key, var_ref_vals, true)) | |
4687 | hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals); | |
7ef224d1 TZ |
4688 | } |
4689 | ||
69a0200c TZ |
4690 | static void hist_trigger_stacktrace_print(struct seq_file *m, |
4691 | unsigned long *stacktrace_entries, | |
4692 | unsigned int max_entries) | |
4693 | { | |
4694 | char str[KSYM_SYMBOL_LEN]; | |
4695 | unsigned int spaces = 8; | |
4696 | unsigned int i; | |
4697 | ||
4698 | for (i = 0; i < max_entries; i++) { | |
4699 | if (stacktrace_entries[i] == ULONG_MAX) | |
4700 | return; | |
4701 | ||
4702 | seq_printf(m, "%*c", 1 + spaces, ' '); | |
4703 | sprint_symbol(str, stacktrace_entries[i]); | |
4704 | seq_printf(m, "%s\n", str); | |
4705 | } | |
4706 | } | |
4707 | ||
7ef224d1 TZ |
4708 | static void |
4709 | hist_trigger_entry_print(struct seq_file *m, | |
4710 | struct hist_trigger_data *hist_data, void *key, | |
4711 | struct tracing_map_elt *elt) | |
4712 | { | |
4713 | struct hist_field *key_field; | |
c6afad49 | 4714 | char str[KSYM_SYMBOL_LEN]; |
69a0200c | 4715 | bool multiline = false; |
85013256 | 4716 | const char *field_name; |
7ef224d1 TZ |
4717 | unsigned int i; |
4718 | u64 uval; | |
4719 | ||
4720 | seq_puts(m, "{ "); | |
4721 | ||
4722 | for_each_hist_key_field(i, hist_data) { | |
4723 | key_field = hist_data->fields[i]; | |
4724 | ||
4725 | if (i > hist_data->n_vals) | |
4726 | seq_puts(m, ", "); | |
4727 | ||
85013256 TZ |
4728 | field_name = hist_field_name(key_field, 0); |
4729 | ||
0c4a6b46 TZ |
4730 | if (key_field->flags & HIST_FIELD_FL_HEX) { |
4731 | uval = *(u64 *)(key + key_field->offset); | |
85013256 | 4732 | seq_printf(m, "%s: %llx", field_name, uval); |
c6afad49 TZ |
4733 | } else if (key_field->flags & HIST_FIELD_FL_SYM) { |
4734 | uval = *(u64 *)(key + key_field->offset); | |
4735 | sprint_symbol_no_offset(str, uval); | |
85013256 TZ |
4736 | seq_printf(m, "%s: [%llx] %-45s", field_name, |
4737 | uval, str); | |
c6afad49 TZ |
4738 | } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { |
4739 | uval = *(u64 *)(key + key_field->offset); | |
4740 | sprint_symbol(str, uval); | |
85013256 TZ |
4741 | seq_printf(m, "%s: [%llx] %-55s", field_name, |
4742 | uval, str); | |
6b4827ad | 4743 | } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { |
af6a29bc TZ |
4744 | struct hist_elt_data *elt_data = elt->private_data; |
4745 | char *comm; | |
4746 | ||
4747 | if (WARN_ON_ONCE(!elt_data)) | |
4748 | return; | |
4749 | ||
4750 | comm = elt_data->comm; | |
6b4827ad TZ |
4751 | |
4752 | uval = *(u64 *)(key + key_field->offset); | |
85013256 TZ |
4753 | seq_printf(m, "%s: %-16s[%10llu]", field_name, |
4754 | comm, uval); | |
31696198 TZ |
4755 | } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { |
4756 | const char *syscall_name; | |
4757 | ||
4758 | uval = *(u64 *)(key + key_field->offset); | |
4759 | syscall_name = get_syscall_name(uval); | |
4760 | if (!syscall_name) | |
4761 | syscall_name = "unknown_syscall"; | |
4762 | ||
85013256 TZ |
4763 | seq_printf(m, "%s: %-30s[%3llu]", field_name, |
4764 | syscall_name, uval); | |
69a0200c TZ |
4765 | } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { |
4766 | seq_puts(m, "stacktrace:\n"); | |
4767 | hist_trigger_stacktrace_print(m, | |
4768 | key + key_field->offset, | |
4769 | HIST_STACKTRACE_DEPTH); | |
4770 | multiline = true; | |
4b94f5b7 | 4771 | } else if (key_field->flags & HIST_FIELD_FL_LOG2) { |
85013256 | 4772 | seq_printf(m, "%s: ~ 2^%-2llu", field_name, |
4b94f5b7 | 4773 | *(u64 *)(key + key_field->offset)); |
0c4a6b46 | 4774 | } else if (key_field->flags & HIST_FIELD_FL_STRING) { |
85013256 | 4775 | seq_printf(m, "%s: %-50s", field_name, |
76a3b0c8 | 4776 | (char *)(key + key_field->offset)); |
7ef224d1 | 4777 | } else { |
76a3b0c8 | 4778 | uval = *(u64 *)(key + key_field->offset); |
85013256 | 4779 | seq_printf(m, "%s: %10llu", field_name, uval); |
7ef224d1 TZ |
4780 | } |
4781 | } | |
4782 | ||
69a0200c TZ |
4783 | if (!multiline) |
4784 | seq_puts(m, " "); | |
4785 | ||
4786 | seq_puts(m, "}"); | |
7ef224d1 TZ |
4787 | |
4788 | seq_printf(m, " hitcount: %10llu", | |
4789 | tracing_map_read_sum(elt, HITCOUNT_IDX)); | |
4790 | ||
f2606835 | 4791 | for (i = 1; i < hist_data->n_vals; i++) { |
85013256 TZ |
4792 | field_name = hist_field_name(hist_data->fields[i], 0); |
4793 | ||
100719dc TZ |
4794 | if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR || |
4795 | hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR) | |
30350d65 TZ |
4796 | continue; |
4797 | ||
0c4a6b46 | 4798 | if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { |
85013256 | 4799 | seq_printf(m, " %s: %10llx", field_name, |
0c4a6b46 TZ |
4800 | tracing_map_read_sum(elt, i)); |
4801 | } else { | |
85013256 | 4802 | seq_printf(m, " %s: %10llu", field_name, |
0c4a6b46 TZ |
4803 | tracing_map_read_sum(elt, i)); |
4804 | } | |
f2606835 TZ |
4805 | } |
4806 | ||
50450603 TZ |
4807 | print_actions(m, hist_data, elt); |
4808 | ||
7ef224d1 TZ |
4809 | seq_puts(m, "\n"); |
4810 | } | |
4811 | ||
4812 | static int print_entries(struct seq_file *m, | |
4813 | struct hist_trigger_data *hist_data) | |
4814 | { | |
4815 | struct tracing_map_sort_entry **sort_entries = NULL; | |
4816 | struct tracing_map *map = hist_data->map; | |
d50c744e | 4817 | int i, n_entries; |
7ef224d1 TZ |
4818 | |
4819 | n_entries = tracing_map_sort_entries(map, hist_data->sort_keys, | |
4820 | hist_data->n_sort_keys, | |
4821 | &sort_entries); | |
4822 | if (n_entries < 0) | |
4823 | return n_entries; | |
4824 | ||
4825 | for (i = 0; i < n_entries; i++) | |
4826 | hist_trigger_entry_print(m, hist_data, | |
4827 | sort_entries[i]->key, | |
4828 | sort_entries[i]->elt); | |
4829 | ||
4830 | tracing_map_destroy_sort_entries(sort_entries, n_entries); | |
4831 | ||
4832 | return n_entries; | |
4833 | } | |
4834 | ||
52a7f16d TZ |
4835 | static void hist_trigger_show(struct seq_file *m, |
4836 | struct event_trigger_data *data, int n) | |
7ef224d1 | 4837 | { |
7ef224d1 | 4838 | struct hist_trigger_data *hist_data; |
6e7a2398 | 4839 | int n_entries; |
7ef224d1 | 4840 | |
52a7f16d TZ |
4841 | if (n > 0) |
4842 | seq_puts(m, "\n\n"); | |
7ef224d1 TZ |
4843 | |
4844 | seq_puts(m, "# event histogram\n#\n# trigger info: "); | |
4845 | data->ops->print(m, data->ops, data); | |
52a7f16d | 4846 | seq_puts(m, "#\n\n"); |
7ef224d1 TZ |
4847 | |
4848 | hist_data = data->private_data; | |
4849 | n_entries = print_entries(m, hist_data); | |
6e7a2398 | 4850 | if (n_entries < 0) |
7ef224d1 | 4851 | n_entries = 0; |
7ef224d1 TZ |
4852 | |
4853 | seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n", | |
4854 | (u64)atomic64_read(&hist_data->map->hits), | |
4855 | n_entries, (u64)atomic64_read(&hist_data->map->drops)); | |
52a7f16d TZ |
4856 | } |
4857 | ||
4858 | static int hist_show(struct seq_file *m, void *v) | |
4859 | { | |
4860 | struct event_trigger_data *data; | |
4861 | struct trace_event_file *event_file; | |
4862 | int n = 0, ret = 0; | |
4863 | ||
4864 | mutex_lock(&event_mutex); | |
4865 | ||
4866 | event_file = event_file_data(m->private); | |
4867 | if (unlikely(!event_file)) { | |
4868 | ret = -ENODEV; | |
4869 | goto out_unlock; | |
4870 | } | |
4871 | ||
4872 | list_for_each_entry_rcu(data, &event_file->triggers, list) { | |
4873 | if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) | |
4874 | hist_trigger_show(m, data, n++); | |
4875 | } | |
4876 | ||
f404da6e TZ |
4877 | if (have_hist_err()) { |
4878 | seq_printf(m, "\nERROR: %s\n", hist_err_str); | |
4879 | seq_printf(m, " Last command: %s\n", last_hist_cmd); | |
4880 | } | |
4881 | ||
7ef224d1 TZ |
4882 | out_unlock: |
4883 | mutex_unlock(&event_mutex); | |
4884 | ||
4885 | return ret; | |
4886 | } | |
4887 | ||
4888 | static int event_hist_open(struct inode *inode, struct file *file) | |
4889 | { | |
4890 | return single_open(file, hist_show, file); | |
4891 | } | |
4892 | ||
4893 | const struct file_operations event_hist_fops = { | |
4894 | .open = event_hist_open, | |
4895 | .read = seq_read, | |
4896 | .llseek = seq_lseek, | |
4897 | .release = single_release, | |
4898 | }; | |
4899 | ||
4900 | static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) | |
4901 | { | |
85013256 TZ |
4902 | const char *field_name = hist_field_name(hist_field, 0); |
4903 | ||
30350d65 TZ |
4904 | if (hist_field->var.name) |
4905 | seq_printf(m, "%s=", hist_field->var.name); | |
4906 | ||
0ae7961e | 4907 | if (hist_field->flags & HIST_FIELD_FL_CPU) |
8b7622bf | 4908 | seq_puts(m, "cpu"); |
067fe038 | 4909 | else if (field_name) { |
7e8b88a3 TZ |
4910 | if (hist_field->flags & HIST_FIELD_FL_VAR_REF || |
4911 | hist_field->flags & HIST_FIELD_FL_ALIAS) | |
067fe038 | 4912 | seq_putc(m, '$'); |
ad42febe | 4913 | seq_printf(m, "%s", field_name); |
0ae7961e TZ |
4914 | } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) |
4915 | seq_puts(m, "common_timestamp"); | |
7ef224d1 TZ |
4916 | } |
4917 | ||
4918 | static int event_hist_trigger_print(struct seq_file *m, | |
4919 | struct event_trigger_ops *ops, | |
4920 | struct event_trigger_data *data) | |
4921 | { | |
4922 | struct hist_trigger_data *hist_data = data->private_data; | |
30350d65 TZ |
4923 | struct hist_field *field; |
4924 | bool have_var = false; | |
7ef224d1 TZ |
4925 | unsigned int i; |
4926 | ||
5463bfda TZ |
4927 | seq_puts(m, "hist:"); |
4928 | ||
4929 | if (data->name) | |
4930 | seq_printf(m, "%s:", data->name); | |
4931 | ||
4932 | seq_puts(m, "keys="); | |
7ef224d1 TZ |
4933 | |
4934 | for_each_hist_key_field(i, hist_data) { | |
30350d65 | 4935 | field = hist_data->fields[i]; |
7ef224d1 TZ |
4936 | |
4937 | if (i > hist_data->n_vals) | |
4938 | seq_puts(m, ","); | |
4939 | ||
30350d65 | 4940 | if (field->flags & HIST_FIELD_FL_STACKTRACE) |
69a0200c TZ |
4941 | seq_puts(m, "stacktrace"); |
4942 | else | |
30350d65 | 4943 | hist_field_print(m, field); |
7ef224d1 TZ |
4944 | } |
4945 | ||
4946 | seq_puts(m, ":vals="); | |
f2606835 TZ |
4947 | |
4948 | for_each_hist_val_field(i, hist_data) { | |
30350d65 TZ |
4949 | field = hist_data->fields[i]; |
4950 | if (field->flags & HIST_FIELD_FL_VAR) { | |
4951 | have_var = true; | |
4952 | continue; | |
4953 | } | |
4954 | ||
f2606835 TZ |
4955 | if (i == HITCOUNT_IDX) |
4956 | seq_puts(m, "hitcount"); | |
4957 | else { | |
4958 | seq_puts(m, ","); | |
30350d65 TZ |
4959 | hist_field_print(m, field); |
4960 | } | |
4961 | } | |
4962 | ||
4963 | if (have_var) { | |
4964 | unsigned int n = 0; | |
4965 | ||
4966 | seq_puts(m, ":"); | |
4967 | ||
4968 | for_each_hist_val_field(i, hist_data) { | |
4969 | field = hist_data->fields[i]; | |
4970 | ||
4971 | if (field->flags & HIST_FIELD_FL_VAR) { | |
4972 | if (n++) | |
4973 | seq_puts(m, ","); | |
4974 | hist_field_print(m, field); | |
4975 | } | |
f2606835 TZ |
4976 | } |
4977 | } | |
7ef224d1 TZ |
4978 | |
4979 | seq_puts(m, ":sort="); | |
e62347d2 TZ |
4980 | |
4981 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
4982 | struct tracing_map_sort_key *sort_key; | |
30350d65 TZ |
4983 | unsigned int idx, first_key_idx; |
4984 | ||
4985 | /* skip VAR vals */ | |
4986 | first_key_idx = hist_data->n_vals - hist_data->n_vars; | |
e62347d2 TZ |
4987 | |
4988 | sort_key = &hist_data->sort_keys[i]; | |
ad42febe TZ |
4989 | idx = sort_key->field_idx; |
4990 | ||
1a361dfc | 4991 | if (WARN_ON(idx >= HIST_FIELDS_MAX)) |
ad42febe | 4992 | return -EINVAL; |
e62347d2 TZ |
4993 | |
4994 | if (i > 0) | |
4995 | seq_puts(m, ","); | |
4996 | ||
ad42febe | 4997 | if (idx == HITCOUNT_IDX) |
e62347d2 | 4998 | seq_puts(m, "hitcount"); |
30350d65 TZ |
4999 | else { |
5000 | if (idx >= first_key_idx) | |
5001 | idx += hist_data->n_vars; | |
e62347d2 | 5002 | hist_field_print(m, hist_data->fields[idx]); |
30350d65 | 5003 | } |
e62347d2 TZ |
5004 | |
5005 | if (sort_key->descending) | |
5006 | seq_puts(m, ".descending"); | |
5007 | } | |
7ef224d1 | 5008 | seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits)); |
a4072fe8 TZ |
5009 | if (hist_data->enable_timestamps) |
5010 | seq_printf(m, ":clock=%s", hist_data->attrs->clock); | |
7ef224d1 | 5011 | |
c282a386 TZ |
5012 | print_actions_spec(m, hist_data); |
5013 | ||
7ef224d1 TZ |
5014 | if (data->filter_str) |
5015 | seq_printf(m, " if %s", data->filter_str); | |
5016 | ||
83e99914 TZ |
5017 | if (data->paused) |
5018 | seq_puts(m, " [paused]"); | |
5019 | else | |
5020 | seq_puts(m, " [active]"); | |
7ef224d1 TZ |
5021 | |
5022 | seq_putc(m, '\n'); | |
5023 | ||
5024 | return 0; | |
5025 | } | |
5026 | ||
5463bfda TZ |
5027 | static int event_hist_trigger_init(struct event_trigger_ops *ops, |
5028 | struct event_trigger_data *data) | |
5029 | { | |
5030 | struct hist_trigger_data *hist_data = data->private_data; | |
5031 | ||
5032 | if (!data->ref && hist_data->attrs->name) | |
5033 | save_named_trigger(hist_data->attrs->name, data); | |
5034 | ||
5035 | data->ref++; | |
5036 | ||
5037 | return 0; | |
5038 | } | |
5039 | ||
02205a67 TZ |
5040 | static void unregister_field_var_hists(struct hist_trigger_data *hist_data) |
5041 | { | |
5042 | struct trace_event_file *file; | |
5043 | unsigned int i; | |
5044 | char *cmd; | |
5045 | int ret; | |
5046 | ||
5047 | for (i = 0; i < hist_data->n_field_var_hists; i++) { | |
5048 | file = hist_data->field_var_hists[i]->hist_data->event_file; | |
5049 | cmd = hist_data->field_var_hists[i]->cmd; | |
5050 | ret = event_hist_trigger_func(&trigger_hist_cmd, file, | |
5051 | "!hist", "hist", cmd); | |
5052 | } | |
5053 | } | |
5054 | ||
7ef224d1 TZ |
5055 | static void event_hist_trigger_free(struct event_trigger_ops *ops, |
5056 | struct event_trigger_data *data) | |
5057 | { | |
5058 | struct hist_trigger_data *hist_data = data->private_data; | |
5059 | ||
5060 | if (WARN_ON_ONCE(data->ref <= 0)) | |
5061 | return; | |
5062 | ||
5063 | data->ref--; | |
5064 | if (!data->ref) { | |
5463bfda TZ |
5065 | if (data->name) |
5066 | del_named_trigger(data); | |
067fe038 | 5067 | |
7ef224d1 | 5068 | trigger_data_free(data); |
067fe038 TZ |
5069 | |
5070 | remove_hist_vars(hist_data); | |
5071 | ||
02205a67 TZ |
5072 | unregister_field_var_hists(hist_data); |
5073 | ||
7ef224d1 TZ |
5074 | destroy_hist_data(hist_data); |
5075 | } | |
5076 | } | |
5077 | ||
5078 | static struct event_trigger_ops event_hist_trigger_ops = { | |
5079 | .func = event_hist_trigger, | |
5080 | .print = event_hist_trigger_print, | |
5463bfda | 5081 | .init = event_hist_trigger_init, |
7ef224d1 TZ |
5082 | .free = event_hist_trigger_free, |
5083 | }; | |
5084 | ||
5463bfda TZ |
5085 | static int event_hist_trigger_named_init(struct event_trigger_ops *ops, |
5086 | struct event_trigger_data *data) | |
5087 | { | |
5088 | data->ref++; | |
5089 | ||
5090 | save_named_trigger(data->named_data->name, data); | |
5091 | ||
5092 | event_hist_trigger_init(ops, data->named_data); | |
5093 | ||
5094 | return 0; | |
5095 | } | |
5096 | ||
5097 | static void event_hist_trigger_named_free(struct event_trigger_ops *ops, | |
5098 | struct event_trigger_data *data) | |
5099 | { | |
5100 | if (WARN_ON_ONCE(data->ref <= 0)) | |
5101 | return; | |
5102 | ||
5103 | event_hist_trigger_free(ops, data->named_data); | |
5104 | ||
5105 | data->ref--; | |
5106 | if (!data->ref) { | |
5107 | del_named_trigger(data); | |
5108 | trigger_data_free(data); | |
5109 | } | |
5110 | } | |
5111 | ||
5112 | static struct event_trigger_ops event_hist_trigger_named_ops = { | |
5113 | .func = event_hist_trigger, | |
5114 | .print = event_hist_trigger_print, | |
5115 | .init = event_hist_trigger_named_init, | |
5116 | .free = event_hist_trigger_named_free, | |
5117 | }; | |
5118 | ||
7ef224d1 TZ |
5119 | static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd, |
5120 | char *param) | |
5121 | { | |
5122 | return &event_hist_trigger_ops; | |
5123 | } | |
5124 | ||
e86ae9ba TZ |
5125 | static void hist_clear(struct event_trigger_data *data) |
5126 | { | |
5127 | struct hist_trigger_data *hist_data = data->private_data; | |
e86ae9ba | 5128 | |
5463bfda TZ |
5129 | if (data->name) |
5130 | pause_named_trigger(data); | |
e86ae9ba TZ |
5131 | |
5132 | synchronize_sched(); | |
5133 | ||
5134 | tracing_map_clear(hist_data->map); | |
5135 | ||
5463bfda TZ |
5136 | if (data->name) |
5137 | unpause_named_trigger(data); | |
5138 | } | |
5139 | ||
5140 | static bool compatible_field(struct ftrace_event_field *field, | |
5141 | struct ftrace_event_field *test_field) | |
5142 | { | |
5143 | if (field == test_field) | |
5144 | return true; | |
5145 | if (field == NULL || test_field == NULL) | |
5146 | return false; | |
5147 | if (strcmp(field->name, test_field->name) != 0) | |
5148 | return false; | |
5149 | if (strcmp(field->type, test_field->type) != 0) | |
5150 | return false; | |
5151 | if (field->size != test_field->size) | |
5152 | return false; | |
5153 | if (field->is_signed != test_field->is_signed) | |
5154 | return false; | |
5155 | ||
5156 | return true; | |
e86ae9ba TZ |
5157 | } |
5158 | ||
52a7f16d | 5159 | static bool hist_trigger_match(struct event_trigger_data *data, |
5463bfda TZ |
5160 | struct event_trigger_data *data_test, |
5161 | struct event_trigger_data *named_data, | |
5162 | bool ignore_filter) | |
52a7f16d TZ |
5163 | { |
5164 | struct tracing_map_sort_key *sort_key, *sort_key_test; | |
5165 | struct hist_trigger_data *hist_data, *hist_data_test; | |
5166 | struct hist_field *key_field, *key_field_test; | |
5167 | unsigned int i; | |
5168 | ||
5463bfda TZ |
5169 | if (named_data && (named_data != data_test) && |
5170 | (named_data != data_test->named_data)) | |
5171 | return false; | |
5172 | ||
5173 | if (!named_data && is_named_trigger(data_test)) | |
5174 | return false; | |
5175 | ||
52a7f16d TZ |
5176 | hist_data = data->private_data; |
5177 | hist_data_test = data_test->private_data; | |
5178 | ||
5179 | if (hist_data->n_vals != hist_data_test->n_vals || | |
5180 | hist_data->n_fields != hist_data_test->n_fields || | |
5181 | hist_data->n_sort_keys != hist_data_test->n_sort_keys) | |
5182 | return false; | |
5183 | ||
5463bfda TZ |
5184 | if (!ignore_filter) { |
5185 | if ((data->filter_str && !data_test->filter_str) || | |
5186 | (!data->filter_str && data_test->filter_str)) | |
5187 | return false; | |
5188 | } | |
52a7f16d TZ |
5189 | |
5190 | for_each_hist_field(i, hist_data) { | |
5191 | key_field = hist_data->fields[i]; | |
5192 | key_field_test = hist_data_test->fields[i]; | |
5193 | ||
5194 | if (key_field->flags != key_field_test->flags) | |
5195 | return false; | |
5463bfda | 5196 | if (!compatible_field(key_field->field, key_field_test->field)) |
52a7f16d TZ |
5197 | return false; |
5198 | if (key_field->offset != key_field_test->offset) | |
5199 | return false; | |
ad42febe TZ |
5200 | if (key_field->size != key_field_test->size) |
5201 | return false; | |
5202 | if (key_field->is_signed != key_field_test->is_signed) | |
5203 | return false; | |
1a361dfc TZ |
5204 | if (!!key_field->var.name != !!key_field_test->var.name) |
5205 | return false; | |
5206 | if (key_field->var.name && | |
5207 | strcmp(key_field->var.name, key_field_test->var.name) != 0) | |
5208 | return false; | |
52a7f16d TZ |
5209 | } |
5210 | ||
5211 | for (i = 0; i < hist_data->n_sort_keys; i++) { | |
5212 | sort_key = &hist_data->sort_keys[i]; | |
5213 | sort_key_test = &hist_data_test->sort_keys[i]; | |
5214 | ||
5215 | if (sort_key->field_idx != sort_key_test->field_idx || | |
5216 | sort_key->descending != sort_key_test->descending) | |
5217 | return false; | |
5218 | } | |
5219 | ||
5463bfda | 5220 | if (!ignore_filter && data->filter_str && |
52a7f16d TZ |
5221 | (strcmp(data->filter_str, data_test->filter_str) != 0)) |
5222 | return false; | |
5223 | ||
48f79473 TZ |
5224 | if (!actions_match(hist_data, hist_data_test)) |
5225 | return false; | |
5226 | ||
52a7f16d TZ |
5227 | return true; |
5228 | } | |
5229 | ||
7ef224d1 TZ |
5230 | static int hist_register_trigger(char *glob, struct event_trigger_ops *ops, |
5231 | struct event_trigger_data *data, | |
5232 | struct trace_event_file *file) | |
5233 | { | |
83e99914 | 5234 | struct hist_trigger_data *hist_data = data->private_data; |
5463bfda | 5235 | struct event_trigger_data *test, *named_data = NULL; |
7ef224d1 TZ |
5236 | int ret = 0; |
5237 | ||
5463bfda TZ |
5238 | if (hist_data->attrs->name) { |
5239 | named_data = find_named_trigger(hist_data->attrs->name); | |
5240 | if (named_data) { | |
5241 | if (!hist_trigger_match(data, named_data, named_data, | |
5242 | true)) { | |
f404da6e | 5243 | hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name); |
5463bfda TZ |
5244 | ret = -EINVAL; |
5245 | goto out; | |
5246 | } | |
5247 | } | |
5248 | } | |
5249 | ||
5250 | if (hist_data->attrs->name && !named_data) | |
5251 | goto new; | |
5252 | ||
7ef224d1 TZ |
5253 | list_for_each_entry_rcu(test, &file->triggers, list) { |
5254 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 5255 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d | 5256 | continue; |
83e99914 TZ |
5257 | if (hist_data->attrs->pause) |
5258 | test->paused = true; | |
5259 | else if (hist_data->attrs->cont) | |
5260 | test->paused = false; | |
e86ae9ba TZ |
5261 | else if (hist_data->attrs->clear) |
5262 | hist_clear(test); | |
f404da6e TZ |
5263 | else { |
5264 | hist_err("Hist trigger already exists", NULL); | |
83e99914 | 5265 | ret = -EEXIST; |
f404da6e | 5266 | } |
7ef224d1 TZ |
5267 | goto out; |
5268 | } | |
5269 | } | |
5463bfda | 5270 | new: |
e86ae9ba | 5271 | if (hist_data->attrs->cont || hist_data->attrs->clear) { |
f404da6e | 5272 | hist_err("Can't clear or continue a nonexistent hist trigger", NULL); |
83e99914 TZ |
5273 | ret = -ENOENT; |
5274 | goto out; | |
5275 | } | |
5276 | ||
7522c03a TZ |
5277 | if (hist_data->attrs->pause) |
5278 | data->paused = true; | |
5279 | ||
5463bfda | 5280 | if (named_data) { |
5463bfda TZ |
5281 | data->private_data = named_data->private_data; |
5282 | set_named_trigger_data(data, named_data); | |
5283 | data->ops = &event_hist_trigger_named_ops; | |
5284 | } | |
5285 | ||
7ef224d1 TZ |
5286 | if (data->ops->init) { |
5287 | ret = data->ops->init(data->ops, data); | |
5288 | if (ret < 0) | |
5289 | goto out; | |
5290 | } | |
5291 | ||
a4072fe8 TZ |
5292 | if (hist_data->enable_timestamps) { |
5293 | char *clock = hist_data->attrs->clock; | |
5294 | ||
5295 | ret = tracing_set_clock(file->tr, hist_data->attrs->clock); | |
5296 | if (ret) { | |
5297 | hist_err("Couldn't set trace_clock: ", clock); | |
5298 | goto out; | |
5299 | } | |
7ef224d1 | 5300 | |
ad42febe | 5301 | tracing_set_time_stamp_abs(file->tr, true); |
a4072fe8 TZ |
5302 | } |
5303 | ||
5304 | if (named_data) | |
5305 | destroy_hist_data(hist_data); | |
5306 | ||
5307 | ret++; | |
067fe038 TZ |
5308 | out: |
5309 | return ret; | |
5310 | } | |
5311 | ||
5312 | static int hist_trigger_enable(struct event_trigger_data *data, | |
5313 | struct trace_event_file *file) | |
5314 | { | |
5315 | int ret = 0; | |
5316 | ||
5317 | list_add_tail_rcu(&data->list, &file->triggers); | |
5318 | ||
5319 | update_cond_flag(file); | |
ad42febe | 5320 | |
7ef224d1 TZ |
5321 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
5322 | list_del_rcu(&data->list); | |
5323 | update_cond_flag(file); | |
5324 | ret--; | |
5325 | } | |
067fe038 | 5326 | |
7ef224d1 TZ |
5327 | return ret; |
5328 | } | |
5329 | ||
4b147936 TZ |
5330 | static bool have_hist_trigger_match(struct event_trigger_data *data, |
5331 | struct trace_event_file *file) | |
5332 | { | |
5333 | struct hist_trigger_data *hist_data = data->private_data; | |
5334 | struct event_trigger_data *test, *named_data = NULL; | |
5335 | bool match = false; | |
5336 | ||
5337 | if (hist_data->attrs->name) | |
5338 | named_data = find_named_trigger(hist_data->attrs->name); | |
5339 | ||
5340 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5341 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5342 | if (hist_trigger_match(data, test, named_data, false)) { | |
5343 | match = true; | |
5344 | break; | |
5345 | } | |
5346 | } | |
5347 | } | |
5348 | ||
5349 | return match; | |
5350 | } | |
5351 | ||
067fe038 TZ |
5352 | static bool hist_trigger_check_refs(struct event_trigger_data *data, |
5353 | struct trace_event_file *file) | |
5354 | { | |
5355 | struct hist_trigger_data *hist_data = data->private_data; | |
5356 | struct event_trigger_data *test, *named_data = NULL; | |
5357 | ||
5358 | if (hist_data->attrs->name) | |
5359 | named_data = find_named_trigger(hist_data->attrs->name); | |
5360 | ||
5361 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5362 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5363 | if (!hist_trigger_match(data, test, named_data, false)) | |
5364 | continue; | |
5365 | hist_data = test->private_data; | |
5366 | if (check_var_refs(hist_data)) | |
5367 | return true; | |
5368 | break; | |
5369 | } | |
5370 | } | |
5371 | ||
5372 | return false; | |
5373 | } | |
5374 | ||
52a7f16d TZ |
5375 | static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops, |
5376 | struct event_trigger_data *data, | |
5377 | struct trace_event_file *file) | |
5378 | { | |
5463bfda TZ |
5379 | struct hist_trigger_data *hist_data = data->private_data; |
5380 | struct event_trigger_data *test, *named_data = NULL; | |
52a7f16d TZ |
5381 | bool unregistered = false; |
5382 | ||
5463bfda TZ |
5383 | if (hist_data->attrs->name) |
5384 | named_data = find_named_trigger(hist_data->attrs->name); | |
5385 | ||
52a7f16d TZ |
5386 | list_for_each_entry_rcu(test, &file->triggers, list) { |
5387 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5463bfda | 5388 | if (!hist_trigger_match(data, test, named_data, false)) |
52a7f16d TZ |
5389 | continue; |
5390 | unregistered = true; | |
5391 | list_del_rcu(&test->list); | |
5392 | trace_event_trigger_enable_disable(file, 0); | |
5393 | update_cond_flag(file); | |
5394 | break; | |
5395 | } | |
5396 | } | |
5397 | ||
5398 | if (unregistered && test->ops->free) | |
5399 | test->ops->free(test->ops, test); | |
ad42febe TZ |
5400 | |
5401 | if (hist_data->enable_timestamps) { | |
30350d65 | 5402 | if (!hist_data->remove || unregistered) |
ad42febe TZ |
5403 | tracing_set_time_stamp_abs(file->tr, false); |
5404 | } | |
52a7f16d TZ |
5405 | } |
5406 | ||
067fe038 TZ |
5407 | static bool hist_file_check_refs(struct trace_event_file *file) |
5408 | { | |
5409 | struct hist_trigger_data *hist_data; | |
5410 | struct event_trigger_data *test; | |
5411 | ||
5412 | list_for_each_entry_rcu(test, &file->triggers, list) { | |
5413 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5414 | hist_data = test->private_data; | |
5415 | if (check_var_refs(hist_data)) | |
5416 | return true; | |
5417 | } | |
5418 | } | |
5419 | ||
5420 | return false; | |
5421 | } | |
5422 | ||
52a7f16d TZ |
5423 | static void hist_unreg_all(struct trace_event_file *file) |
5424 | { | |
47c18569 | 5425 | struct event_trigger_data *test, *n; |
ad42febe | 5426 | struct hist_trigger_data *hist_data; |
4b147936 TZ |
5427 | struct synth_event *se; |
5428 | const char *se_name; | |
52a7f16d | 5429 | |
067fe038 TZ |
5430 | if (hist_file_check_refs(file)) |
5431 | return; | |
5432 | ||
47c18569 | 5433 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d | 5434 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
ad42febe | 5435 | hist_data = test->private_data; |
52a7f16d TZ |
5436 | list_del_rcu(&test->list); |
5437 | trace_event_trigger_enable_disable(file, 0); | |
4b147936 TZ |
5438 | |
5439 | mutex_lock(&synth_event_mutex); | |
5440 | se_name = trace_event_name(file->event_call); | |
5441 | se = find_synth_event(se_name); | |
5442 | if (se) | |
5443 | se->ref--; | |
5444 | mutex_unlock(&synth_event_mutex); | |
5445 | ||
52a7f16d | 5446 | update_cond_flag(file); |
ad42febe TZ |
5447 | if (hist_data->enable_timestamps) |
5448 | tracing_set_time_stamp_abs(file->tr, false); | |
52a7f16d TZ |
5449 | if (test->ops->free) |
5450 | test->ops->free(test->ops, test); | |
5451 | } | |
5452 | } | |
5453 | } | |
5454 | ||
7ef224d1 TZ |
5455 | static int event_hist_trigger_func(struct event_command *cmd_ops, |
5456 | struct trace_event_file *file, | |
5457 | char *glob, char *cmd, char *param) | |
5458 | { | |
5459 | unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT; | |
5460 | struct event_trigger_data *trigger_data; | |
5461 | struct hist_trigger_attrs *attrs; | |
5462 | struct event_trigger_ops *trigger_ops; | |
5463 | struct hist_trigger_data *hist_data; | |
4b147936 TZ |
5464 | struct synth_event *se; |
5465 | const char *se_name; | |
30350d65 | 5466 | bool remove = false; |
ec5ce098 | 5467 | char *trigger, *p; |
7ef224d1 TZ |
5468 | int ret = 0; |
5469 | ||
f404da6e TZ |
5470 | if (glob && strlen(glob)) { |
5471 | last_cmd_set(param); | |
5472 | hist_err_clear(); | |
5473 | } | |
5474 | ||
7ef224d1 TZ |
5475 | if (!param) |
5476 | return -EINVAL; | |
5477 | ||
30350d65 TZ |
5478 | if (glob[0] == '!') |
5479 | remove = true; | |
5480 | ||
ec5ce098 TZ |
5481 | /* |
5482 | * separate the trigger from the filter (k:v [if filter]) | |
5483 | * allowing for whitespace in the trigger | |
5484 | */ | |
5485 | p = trigger = param; | |
5486 | do { | |
5487 | p = strstr(p, "if"); | |
5488 | if (!p) | |
5489 | break; | |
5490 | if (p == param) | |
5491 | return -EINVAL; | |
5492 | if (*(p - 1) != ' ' && *(p - 1) != '\t') { | |
5493 | p++; | |
5494 | continue; | |
5495 | } | |
5496 | if (p >= param + strlen(param) - strlen("if") - 1) | |
5497 | return -EINVAL; | |
5498 | if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') { | |
5499 | p++; | |
5500 | continue; | |
5501 | } | |
5502 | break; | |
5503 | } while (p); | |
5504 | ||
5505 | if (!p) | |
5506 | param = NULL; | |
5507 | else { | |
5508 | *(p - 1) = '\0'; | |
5509 | param = strstrip(p); | |
5510 | trigger = strstrip(trigger); | |
5511 | } | |
7ef224d1 TZ |
5512 | |
5513 | attrs = parse_hist_trigger_attrs(trigger); | |
5514 | if (IS_ERR(attrs)) | |
5515 | return PTR_ERR(attrs); | |
5516 | ||
5517 | if (attrs->map_bits) | |
5518 | hist_trigger_bits = attrs->map_bits; | |
5519 | ||
30350d65 | 5520 | hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove); |
7ef224d1 TZ |
5521 | if (IS_ERR(hist_data)) { |
5522 | destroy_hist_trigger_attrs(attrs); | |
5523 | return PTR_ERR(hist_data); | |
5524 | } | |
5525 | ||
5526 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); | |
5527 | ||
7ef224d1 | 5528 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); |
4b147936 TZ |
5529 | if (!trigger_data) { |
5530 | ret = -ENOMEM; | |
7ef224d1 | 5531 | goto out_free; |
4b147936 | 5532 | } |
7ef224d1 TZ |
5533 | |
5534 | trigger_data->count = -1; | |
5535 | trigger_data->ops = trigger_ops; | |
5536 | trigger_data->cmd_ops = cmd_ops; | |
5537 | ||
5538 | INIT_LIST_HEAD(&trigger_data->list); | |
5539 | RCU_INIT_POINTER(trigger_data->filter, NULL); | |
5540 | ||
5541 | trigger_data->private_data = hist_data; | |
5542 | ||
52a7f16d TZ |
5543 | /* if param is non-empty, it's supposed to be a filter */ |
5544 | if (param && cmd_ops->set_filter) { | |
5545 | ret = cmd_ops->set_filter(param, trigger_data, file); | |
5546 | if (ret < 0) | |
5547 | goto out_free; | |
5548 | } | |
5549 | ||
30350d65 | 5550 | if (remove) { |
4b147936 TZ |
5551 | if (!have_hist_trigger_match(trigger_data, file)) |
5552 | goto out_free; | |
5553 | ||
067fe038 TZ |
5554 | if (hist_trigger_check_refs(trigger_data, file)) { |
5555 | ret = -EBUSY; | |
5556 | goto out_free; | |
5557 | } | |
5558 | ||
7ef224d1 | 5559 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); |
4b147936 TZ |
5560 | |
5561 | mutex_lock(&synth_event_mutex); | |
5562 | se_name = trace_event_name(file->event_call); | |
5563 | se = find_synth_event(se_name); | |
5564 | if (se) | |
5565 | se->ref--; | |
5566 | mutex_unlock(&synth_event_mutex); | |
5567 | ||
7ef224d1 TZ |
5568 | ret = 0; |
5569 | goto out_free; | |
5570 | } | |
5571 | ||
7ef224d1 TZ |
5572 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
5573 | /* | |
5574 | * The above returns on success the # of triggers registered, | |
5575 | * but if it didn't register any it returns zero. Consider no | |
5576 | * triggers registered a failure too. | |
5577 | */ | |
5578 | if (!ret) { | |
e86ae9ba | 5579 | if (!(attrs->pause || attrs->cont || attrs->clear)) |
83e99914 | 5580 | ret = -ENOENT; |
7ef224d1 TZ |
5581 | goto out_free; |
5582 | } else if (ret < 0) | |
5583 | goto out_free; | |
067fe038 TZ |
5584 | |
5585 | if (get_named_trigger_data(trigger_data)) | |
5586 | goto enable; | |
5587 | ||
5588 | if (has_hist_vars(hist_data)) | |
5589 | save_hist_vars(hist_data); | |
5590 | ||
0212e2aa TZ |
5591 | ret = create_actions(hist_data, file); |
5592 | if (ret) | |
5593 | goto out_unreg; | |
5594 | ||
067fe038 TZ |
5595 | ret = tracing_map_init(hist_data->map); |
5596 | if (ret) | |
5597 | goto out_unreg; | |
5598 | enable: | |
5599 | ret = hist_trigger_enable(trigger_data, file); | |
5600 | if (ret) | |
5601 | goto out_unreg; | |
5602 | ||
4b147936 TZ |
5603 | mutex_lock(&synth_event_mutex); |
5604 | se_name = trace_event_name(file->event_call); | |
5605 | se = find_synth_event(se_name); | |
5606 | if (se) | |
5607 | se->ref++; | |
5608 | mutex_unlock(&synth_event_mutex); | |
5609 | ||
7ef224d1 TZ |
5610 | /* Just return zero, not the number of registered triggers */ |
5611 | ret = 0; | |
5612 | out: | |
f404da6e TZ |
5613 | if (ret == 0) |
5614 | hist_err_clear(); | |
5615 | ||
7ef224d1 | 5616 | return ret; |
067fe038 TZ |
5617 | out_unreg: |
5618 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); | |
7ef224d1 TZ |
5619 | out_free: |
5620 | if (cmd_ops->set_filter) | |
5621 | cmd_ops->set_filter(NULL, trigger_data, NULL); | |
5622 | ||
067fe038 TZ |
5623 | remove_hist_vars(hist_data); |
5624 | ||
7ef224d1 TZ |
5625 | kfree(trigger_data); |
5626 | ||
5627 | destroy_hist_data(hist_data); | |
5628 | goto out; | |
5629 | } | |
5630 | ||
5631 | static struct event_command trigger_hist_cmd = { | |
5632 | .name = "hist", | |
5633 | .trigger_type = ETT_EVENT_HIST, | |
5634 | .flags = EVENT_CMD_FL_NEEDS_REC, | |
5635 | .func = event_hist_trigger_func, | |
5636 | .reg = hist_register_trigger, | |
52a7f16d TZ |
5637 | .unreg = hist_unregister_trigger, |
5638 | .unreg_all = hist_unreg_all, | |
7ef224d1 TZ |
5639 | .get_trigger_ops = event_hist_get_trigger_ops, |
5640 | .set_filter = set_trigger_filter, | |
5641 | }; | |
5642 | ||
5643 | __init int register_trigger_hist_cmd(void) | |
5644 | { | |
5645 | int ret; | |
5646 | ||
5647 | ret = register_event_command(&trigger_hist_cmd); | |
5648 | WARN_ON(ret < 0); | |
5649 | ||
5650 | return ret; | |
5651 | } | |
d0bad49b TZ |
5652 | |
5653 | static void | |
1ac4f51c TZ |
5654 | hist_enable_trigger(struct event_trigger_data *data, void *rec, |
5655 | struct ring_buffer_event *event) | |
d0bad49b TZ |
5656 | { |
5657 | struct enable_trigger_data *enable_data = data->private_data; | |
5658 | struct event_trigger_data *test; | |
5659 | ||
5660 | list_for_each_entry_rcu(test, &enable_data->file->triggers, list) { | |
5661 | if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { | |
5662 | if (enable_data->enable) | |
5663 | test->paused = false; | |
5664 | else | |
5665 | test->paused = true; | |
d0bad49b TZ |
5666 | } |
5667 | } | |
5668 | } | |
5669 | ||
5670 | static void | |
1ac4f51c TZ |
5671 | hist_enable_count_trigger(struct event_trigger_data *data, void *rec, |
5672 | struct ring_buffer_event *event) | |
d0bad49b TZ |
5673 | { |
5674 | if (!data->count) | |
5675 | return; | |
5676 | ||
5677 | if (data->count != -1) | |
5678 | (data->count)--; | |
5679 | ||
1ac4f51c | 5680 | hist_enable_trigger(data, rec, event); |
d0bad49b TZ |
5681 | } |
5682 | ||
5683 | static struct event_trigger_ops hist_enable_trigger_ops = { | |
5684 | .func = hist_enable_trigger, | |
5685 | .print = event_enable_trigger_print, | |
5686 | .init = event_trigger_init, | |
5687 | .free = event_enable_trigger_free, | |
5688 | }; | |
5689 | ||
5690 | static struct event_trigger_ops hist_enable_count_trigger_ops = { | |
5691 | .func = hist_enable_count_trigger, | |
5692 | .print = event_enable_trigger_print, | |
5693 | .init = event_trigger_init, | |
5694 | .free = event_enable_trigger_free, | |
5695 | }; | |
5696 | ||
5697 | static struct event_trigger_ops hist_disable_trigger_ops = { | |
5698 | .func = hist_enable_trigger, | |
5699 | .print = event_enable_trigger_print, | |
5700 | .init = event_trigger_init, | |
5701 | .free = event_enable_trigger_free, | |
5702 | }; | |
5703 | ||
5704 | static struct event_trigger_ops hist_disable_count_trigger_ops = { | |
5705 | .func = hist_enable_count_trigger, | |
5706 | .print = event_enable_trigger_print, | |
5707 | .init = event_trigger_init, | |
5708 | .free = event_enable_trigger_free, | |
5709 | }; | |
5710 | ||
5711 | static struct event_trigger_ops * | |
5712 | hist_enable_get_trigger_ops(char *cmd, char *param) | |
5713 | { | |
5714 | struct event_trigger_ops *ops; | |
5715 | bool enable; | |
5716 | ||
5717 | enable = (strcmp(cmd, ENABLE_HIST_STR) == 0); | |
5718 | ||
5719 | if (enable) | |
5720 | ops = param ? &hist_enable_count_trigger_ops : | |
5721 | &hist_enable_trigger_ops; | |
5722 | else | |
5723 | ops = param ? &hist_disable_count_trigger_ops : | |
5724 | &hist_disable_trigger_ops; | |
5725 | ||
5726 | return ops; | |
5727 | } | |
5728 | ||
52a7f16d TZ |
5729 | static void hist_enable_unreg_all(struct trace_event_file *file) |
5730 | { | |
47c18569 | 5731 | struct event_trigger_data *test, *n; |
52a7f16d | 5732 | |
47c18569 | 5733 | list_for_each_entry_safe(test, n, &file->triggers, list) { |
52a7f16d TZ |
5734 | if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) { |
5735 | list_del_rcu(&test->list); | |
5736 | update_cond_flag(file); | |
5737 | trace_event_trigger_enable_disable(file, 0); | |
5738 | if (test->ops->free) | |
5739 | test->ops->free(test->ops, test); | |
5740 | } | |
5741 | } | |
5742 | } | |
5743 | ||
d0bad49b TZ |
5744 | static struct event_command trigger_hist_enable_cmd = { |
5745 | .name = ENABLE_HIST_STR, | |
5746 | .trigger_type = ETT_HIST_ENABLE, | |
5747 | .func = event_enable_trigger_func, | |
5748 | .reg = event_enable_register_trigger, | |
5749 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 5750 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
5751 | .get_trigger_ops = hist_enable_get_trigger_ops, |
5752 | .set_filter = set_trigger_filter, | |
5753 | }; | |
5754 | ||
5755 | static struct event_command trigger_hist_disable_cmd = { | |
5756 | .name = DISABLE_HIST_STR, | |
5757 | .trigger_type = ETT_HIST_ENABLE, | |
5758 | .func = event_enable_trigger_func, | |
5759 | .reg = event_enable_register_trigger, | |
5760 | .unreg = event_enable_unregister_trigger, | |
52a7f16d | 5761 | .unreg_all = hist_enable_unreg_all, |
d0bad49b TZ |
5762 | .get_trigger_ops = hist_enable_get_trigger_ops, |
5763 | .set_filter = set_trigger_filter, | |
5764 | }; | |
5765 | ||
5766 | static __init void unregister_trigger_hist_enable_disable_cmds(void) | |
5767 | { | |
5768 | unregister_event_command(&trigger_hist_enable_cmd); | |
5769 | unregister_event_command(&trigger_hist_disable_cmd); | |
5770 | } | |
5771 | ||
5772 | __init int register_trigger_hist_enable_disable_cmds(void) | |
5773 | { | |
5774 | int ret; | |
5775 | ||
5776 | ret = register_event_command(&trigger_hist_enable_cmd); | |
5777 | if (WARN_ON(ret < 0)) | |
5778 | return ret; | |
5779 | ret = register_event_command(&trigger_hist_disable_cmd); | |
5780 | if (WARN_ON(ret < 0)) | |
5781 | unregister_trigger_hist_enable_disable_cmds(); | |
5782 | ||
5783 | return ret; | |
5784 | } | |
4b147936 TZ |
5785 | |
5786 | static __init int trace_events_hist_init(void) | |
5787 | { | |
5788 | struct dentry *entry = NULL; | |
5789 | struct dentry *d_tracer; | |
5790 | int err = 0; | |
5791 | ||
5792 | d_tracer = tracing_init_dentry(); | |
5793 | if (IS_ERR(d_tracer)) { | |
5794 | err = PTR_ERR(d_tracer); | |
5795 | goto err; | |
5796 | } | |
5797 | ||
5798 | entry = tracefs_create_file("synthetic_events", 0644, d_tracer, | |
5799 | NULL, &synth_events_fops); | |
5800 | if (!entry) { | |
5801 | err = -ENODEV; | |
5802 | goto err; | |
5803 | } | |
5804 | ||
5805 | return err; | |
5806 | err: | |
5807 | pr_warn("Could not create tracefs 'synthetic_events' entry\n"); | |
5808 | ||
5809 | return err; | |
5810 | } | |
5811 | ||
5812 | fs_initcall(trace_events_hist_init); |