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