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ALSA: pcm: Fix missing check of the new non-cached buffer type
[linux-2.6-block.git] / kernel / trace / trace_events_hist.c
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bcea3f96 1// SPDX-License-Identifier: GPL-2.0
7ef224d1
TZ		 2/*
3 * trace_events_hist - trace event hist triggers
4 *
7ef224d1
TZ		 5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
6 */
7
8#include <linux/module.h>
9#include <linux/kallsyms.h>
10#include <linux/mutex.h>
11#include <linux/slab.h>
12#include <linux/stacktrace.h>
b2d09103 13#include <linux/rculist.h>
4b147936 14#include <linux/tracefs.h>
7ef224d1 15
ac681546
ZX		 16/* for gfp flag names */
17#include <linux/trace_events.h>
18#include <trace/events/mmflags.h>
19
7ef224d1
TZ		 20#include "tracing_map.h"
21#include "trace.h"
7bbab38d 22#include "trace_dynevent.h"
7ef224d1 23
4b147936
TZ		 24#define SYNTH_SYSTEM "synthetic"
25#define SYNTH_FIELDS_MAX 16
26
27#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
28
d566c5e9
TZ		 29#define ERRORS \
30 C(NONE, "No error"), \
31 C(DUPLICATE_VAR, "Variable already defined"), \
32 C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
33 C(TOO_MANY_VARS, "Too many variables defined"), \
34 C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
35 C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
36 C(TRIGGER_EEXIST, "Hist trigger already exists"), \
37 C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
38 C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
39 C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
40 C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
41 C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
42 C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
43 C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
44 C(HIST_NOT_FOUND, "Matching event histogram not found"), \
45 C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
46 C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
47 C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
48 C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
49 C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
50 C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
51 C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
52 C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
53 C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
54 C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
55 C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
56 C(TOO_MANY_PARAMS, "Too many action params"), \
57 C(PARAM_NOT_FOUND, "Couldn't find param"), \
58 C(INVALID_PARAM, "Invalid action param"), \
59 C(ACTION_NOT_FOUND, "No action found"), \
60 C(NO_SAVE_PARAMS, "No params found for save()"), \
61 C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
62 C(ACTION_MISMATCH, "Handler doesn't support action"), \
63 C(NO_CLOSING_PAREN, "No closing paren found"), \
64 C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
65 C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
c8d94a18 66 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
d566c5e9
TZ		 67 C(VAR_NOT_FOUND, "Couldn't find variable"), \
68 C(FIELD_NOT_FOUND, "Couldn't find field"),
69
70#undef C
71#define C(a, b) HIST_ERR_##a
72
73enum { ERRORS };
74
75#undef C
76#define C(a, b) b
77
78static const char *err_text[] = { ERRORS };
79
7ef224d1
TZ		 80struct hist_field;
81
df35d93b
TZ		 82typedef u64 (*hist_field_fn_t) (struct hist_field *field,
83 struct tracing_map_elt *elt,
84 struct ring_buffer_event *rbe,
85 void *event);
7ef224d1 86
5819eadd 87#define HIST_FIELD_OPERANDS_MAX 2
30350d65 88#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
0212e2aa 89#define HIST_ACTIONS_MAX 8
30350d65 90
100719dc
TZ		 91enum field_op_id {
92 FIELD_OP_NONE,
93 FIELD_OP_PLUS,
94 FIELD_OP_MINUS,
95 FIELD_OP_UNARY_MINUS,
96};
97
05ddb25c
TZ		 98/*
99 * A hist_var (histogram variable) contains variable information for
100 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
101 * flag set. A hist_var has a variable name e.g. ts0, and is
102 * associated with a given histogram trigger, as specified by
103 * hist_data. The hist_var idx is the unique index assigned to the
104 * variable by the hist trigger's tracing_map. The idx is what is
105 * used to set a variable's value and, by a variable reference, to
106 * retrieve it.
107 */
30350d65
TZ		 108struct hist_var {
109 char *name;
110 struct hist_trigger_data *hist_data;
111 unsigned int idx;
112};
5819eadd 113
7ef224d1
TZ		 114struct hist_field {
115 struct ftrace_event_field *field;
116 unsigned long flags;
117 hist_field_fn_t fn;
118 unsigned int size;
76a3b0c8 119 unsigned int offset;
5819eadd 120 unsigned int is_signed;
19a9facd 121 const char *type;
5819eadd 122 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
b559d003 123 struct hist_trigger_data *hist_data;
05ddb25c
TZ		 124
125 /*
126 * Variable fields contain variable-specific info in var.
127 */
30350d65 128 struct hist_var var;
100719dc 129 enum field_op_id operator;
067fe038
TZ		 130 char *system;
131 char *event_name;
05ddb25c
TZ		 132
133 /*
134 * The name field is used for EXPR and VAR_REF fields. VAR
135 * fields contain the variable name in var.name.
136 */
100719dc 137 char *name;
05ddb25c
TZ		 138
139 /*
140 * When a histogram trigger is hit, if it has any references
141 * to variables, the values of those variables are collected
142 * into a var_ref_vals array by resolve_var_refs(). The
143 * current value of each variable is read from the tracing_map
144 * using the hist field's hist_var.idx and entered into the
145 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
146 */
067fe038
TZ		 147 unsigned int var_ref_idx;
148 bool read_once;
7ef224d1
TZ		 149};
150
df35d93b
TZ		 151static u64 hist_field_none(struct hist_field *field,
152 struct tracing_map_elt *elt,
153 struct ring_buffer_event *rbe,
154 void *event)
69a0200c
TZ		 155{
156 return 0;
157}
158
df35d93b
TZ		 159static u64 hist_field_counter(struct hist_field *field,
160 struct tracing_map_elt *elt,
161 struct ring_buffer_event *rbe,
162 void *event)
7ef224d1
TZ		 163{
164 return 1;
165}
166
df35d93b
TZ		 167static u64 hist_field_string(struct hist_field *hist_field,
168 struct tracing_map_elt *elt,
169 struct ring_buffer_event *rbe,
170 void *event)
7ef224d1
TZ		 171{
172 char *addr = (char *)(event + hist_field->field->offset);
173
174 return (u64)(unsigned long)addr;
175}
176
df35d93b
TZ		 177static u64 hist_field_dynstring(struct hist_field *hist_field,
178 struct tracing_map_elt *elt,
179 struct ring_buffer_event *rbe,
180 void *event)
79e577cb
NK		 181{
182 u32 str_item = *(u32 *)(event + hist_field->field->offset);
183 int str_loc = str_item & 0xffff;
184 char *addr = (char *)(event + str_loc);
185
186 return (u64)(unsigned long)addr;
187}
188
df35d93b
TZ		 189static u64 hist_field_pstring(struct hist_field *hist_field,
190 struct tracing_map_elt *elt,
191 struct ring_buffer_event *rbe,
192 void *event)
79e577cb
NK		 193{
194 char **addr = (char **)(event + hist_field->field->offset);
195
196 return (u64)(unsigned long)*addr;
197}
198
df35d93b
TZ		 199static u64 hist_field_log2(struct hist_field *hist_field,
200 struct tracing_map_elt *elt,
201 struct ring_buffer_event *rbe,
202 void *event)
4b94f5b7 203{
5819eadd
TZ		 204 struct hist_field *operand = hist_field->operands[0];
205
df35d93b 206 u64 val = operand->fn(operand, elt, rbe, event);
4b94f5b7
NK		 207
208 return (u64) ilog2(roundup_pow_of_two(val));
209}
210
df35d93b
TZ		 211static u64 hist_field_plus(struct hist_field *hist_field,
212 struct tracing_map_elt *elt,
213 struct ring_buffer_event *rbe,
214 void *event)
100719dc
TZ		 215{
216 struct hist_field *operand1 = hist_field->operands[0];
217 struct hist_field *operand2 = hist_field->operands[1];
218
df35d93b
TZ		 219 u64 val1 = operand1->fn(operand1, elt, rbe, event);
220 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 221
222 return val1 + val2;
223}
224
df35d93b
TZ		 225static u64 hist_field_minus(struct hist_field *hist_field,
226 struct tracing_map_elt *elt,
227 struct ring_buffer_event *rbe,
228 void *event)
100719dc
TZ		 229{
230 struct hist_field *operand1 = hist_field->operands[0];
231 struct hist_field *operand2 = hist_field->operands[1];
232
df35d93b
TZ		 233 u64 val1 = operand1->fn(operand1, elt, rbe, event);
234 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 235
236 return val1 - val2;
237}
238
df35d93b
TZ		 239static u64 hist_field_unary_minus(struct hist_field *hist_field,
240 struct tracing_map_elt *elt,
241 struct ring_buffer_event *rbe,
242 void *event)
100719dc
TZ		 243{
244 struct hist_field *operand = hist_field->operands[0];
245
df35d93b 246 s64 sval = (s64)operand->fn(operand, elt, rbe, event);
100719dc
TZ		 247 u64 val = (u64)-sval;
248
249 return val;
250}
251
7ef224d1 252#define DEFINE_HIST_FIELD_FN(type) \
fbd302cb 253 static u64 hist_field_##type(struct hist_field *hist_field, \
df35d93b
TZ		 254 struct tracing_map_elt *elt, \
255 struct ring_buffer_event *rbe, \
256 void *event) \
7ef224d1
TZ		 257{ \
258 type *addr = (type *)(event + hist_field->field->offset); \
259 \
79e577cb 260 return (u64)(unsigned long)*addr; \
7ef224d1
TZ		 261}
262
263DEFINE_HIST_FIELD_FN(s64);
264DEFINE_HIST_FIELD_FN(u64);
265DEFINE_HIST_FIELD_FN(s32);
266DEFINE_HIST_FIELD_FN(u32);
267DEFINE_HIST_FIELD_FN(s16);
268DEFINE_HIST_FIELD_FN(u16);
269DEFINE_HIST_FIELD_FN(s8);
270DEFINE_HIST_FIELD_FN(u8);
271
272#define for_each_hist_field(i, hist_data) \
273 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
274
275#define for_each_hist_val_field(i, hist_data) \
276 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
277
278#define for_each_hist_key_field(i, hist_data) \
279 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
280
69a0200c
TZ		 281#define HIST_STACKTRACE_DEPTH 16
282#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
283#define HIST_STACKTRACE_SKIP 5
284
7ef224d1 285#define HITCOUNT_IDX 0
69a0200c 286#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
7ef224d1
TZ		 287
288enum hist_field_flags {
0d7a8325
TZ		 289 HIST_FIELD_FL_HITCOUNT = 1 << 0,
290 HIST_FIELD_FL_KEY = 1 << 1,
291 HIST_FIELD_FL_STRING = 1 << 2,
292 HIST_FIELD_FL_HEX = 1 << 3,
293 HIST_FIELD_FL_SYM = 1 << 4,
294 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
295 HIST_FIELD_FL_EXECNAME = 1 << 6,
296 HIST_FIELD_FL_SYSCALL = 1 << 7,
297 HIST_FIELD_FL_STACKTRACE = 1 << 8,
298 HIST_FIELD_FL_LOG2 = 1 << 9,
ad42febe 299 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
860f9f6b 300 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
30350d65 301 HIST_FIELD_FL_VAR = 1 << 12,
100719dc 302 HIST_FIELD_FL_EXPR = 1 << 13,
067fe038 303 HIST_FIELD_FL_VAR_REF = 1 << 14,
8b7622bf 304 HIST_FIELD_FL_CPU = 1 << 15,
7e8b88a3 305 HIST_FIELD_FL_ALIAS = 1 << 16,
30350d65
TZ		 306};
307
308struct var_defs {
309 unsigned int n_vars;
310 char *name[TRACING_MAP_VARS_MAX];
311 char *expr[TRACING_MAP_VARS_MAX];
7ef224d1
TZ		 312};
313
314struct hist_trigger_attrs {
315 char *keys_str;
f2606835 316 char *vals_str;
e62347d2 317 char *sort_key_str;
5463bfda 318 char *name;
a4072fe8 319 char *clock;
83e99914
TZ		 320 bool pause;
321 bool cont;
e86ae9ba 322 bool clear;
860f9f6b 323 bool ts_in_usecs;
7ef224d1 324 unsigned int map_bits;
30350d65
TZ		 325
326 char *assignment_str[TRACING_MAP_VARS_MAX];
327 unsigned int n_assignments;
328
0212e2aa
TZ		 329 char *action_str[HIST_ACTIONS_MAX];
330 unsigned int n_actions;
331
30350d65 332 struct var_defs var_defs;
7ef224d1
TZ		 333};
334
02205a67
TZ		 335struct field_var {
336 struct hist_field *var;
337 struct hist_field *val;
338};
339
340struct field_var_hist {
341 struct hist_trigger_data *hist_data;
342 char *cmd;
343};
344
7ef224d1 345struct hist_trigger_data {
30350d65 346 struct hist_field *fields[HIST_FIELDS_MAX];
7ef224d1
TZ		 347 unsigned int n_vals;
348 unsigned int n_keys;
349 unsigned int n_fields;
30350d65 350 unsigned int n_vars;
7ef224d1
TZ		 351 unsigned int key_size;
352 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
353 unsigned int n_sort_keys;
354 struct trace_event_file *event_file;
355 struct hist_trigger_attrs *attrs;
356 struct tracing_map *map;
ad42febe 357 bool enable_timestamps;
30350d65 358 bool remove;
067fe038
TZ		 359 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
360 unsigned int n_var_refs;
0212e2aa
TZ		 361
362 struct action_data *actions[HIST_ACTIONS_MAX];
363 unsigned int n_actions;
02205a67
TZ		 364
365 struct field_var *field_vars[SYNTH_FIELDS_MAX];
366 unsigned int n_field_vars;
367 unsigned int n_field_var_str;
368 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
369 unsigned int n_field_var_hists;
50450603 370
7d18a10c
TZ		 371 struct field_var *save_vars[SYNTH_FIELDS_MAX];
372 unsigned int n_save_vars;
373 unsigned int n_save_var_str;
0212e2aa
TZ		 374};
375
7bbab38d
MH		 376static int synth_event_create(int argc, const char **argv);
377static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
378static int synth_event_release(struct dyn_event *ev);
379static bool synth_event_is_busy(struct dyn_event *ev);
380static bool synth_event_match(const char *system, const char *event,
30199137 381 int argc, const char **argv, struct dyn_event *ev);
7bbab38d
MH		 382
383static struct dyn_event_operations synth_event_ops = {
384 .create = synth_event_create,
385 .show = synth_event_show,
386 .is_busy = synth_event_is_busy,
387 .free = synth_event_release,
388 .match = synth_event_match,
389};
390
4b147936
TZ		 391struct synth_field {
392 char *type;
393 char *name;
394 size_t size;
395 bool is_signed;
396 bool is_string;
397};
398
399struct synth_event {
7bbab38d 400 struct dyn_event devent;
4b147936
TZ		 401 int ref;
402 char *name;
403 struct synth_field **fields;
404 unsigned int n_fields;
405 unsigned int n_u64;
406 struct trace_event_class class;
407 struct trace_event_call call;
408 struct tracepoint *tp;
409};
410
7bbab38d
MH		 411static bool is_synth_event(struct dyn_event *ev)
412{
413 return ev->ops == &synth_event_ops;
414}
415
416static struct synth_event *to_synth_event(struct dyn_event *ev)
417{
418 return container_of(ev, struct synth_event, devent);
419}
420
421static bool synth_event_is_busy(struct dyn_event *ev)
422{
423 struct synth_event *event = to_synth_event(ev);
424
425 return event->ref != 0;
426}
427
428static bool synth_event_match(const char *system, const char *event,
30199137 429 int argc, const char **argv, struct dyn_event *ev)
7bbab38d
MH		 430{
431 struct synth_event *sev = to_synth_event(ev);
432
433 return strcmp(sev->name, event) == 0 &&
434 (!system || strcmp(system, SYNTH_SYSTEM) == 0);
435}
436
0212e2aa
TZ		 437struct action_data;
438
439typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
440 struct tracing_map_elt *elt, void *rec,
7d18a10c 441 struct ring_buffer_event *rbe, void *key,
0212e2aa
TZ		 442 struct action_data *data, u64 *var_ref_vals);
443
466f4528
TZ		 444typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
445
7d18a10c
TZ		 446enum handler_id {
447 HANDLER_ONMATCH = 1,
448 HANDLER_ONMAX,
dff81f55 449 HANDLER_ONCHANGE,
7d18a10c
TZ		 450};
451
452enum action_id {
453 ACTION_SAVE = 1,
454 ACTION_TRACE,
a3785b7e 455 ACTION_SNAPSHOT,
7d18a10c
TZ		 456};
457
0212e2aa 458struct action_data {
7d18a10c
TZ		 459 enum handler_id handler;
460 enum action_id action;
461 char *action_name;
0212e2aa 462 action_fn_t fn;
7d18a10c 463
c282a386
TZ		 464 unsigned int n_params;
465 char *params[SYNTH_FIELDS_MAX];
466
c3e49506
TZ		 467 /*
468 * When a histogram trigger is hit, the values of any
469 * references to variables, including variables being passed
470 * as parameters to synthetic events, are collected into a
471 * var_ref_vals array. This var_ref_idx is the index of the
472 * first param in the array to be passed to the synthetic
473 * event invocation.
474 */
475 unsigned int var_ref_idx;
476 struct synth_event *synth_event;
e91eefd7
TZ		 477 bool use_trace_keyword;
478 char *synth_event_name;
c3e49506 479
c282a386
TZ		 480 union {
481 struct {
c3e49506
TZ		 482 char *event;
483 char *event_system;
484 } match_data;
50450603
TZ		 485
486 struct {
466f4528
TZ		 487 /*
488 * var_str contains the $-unstripped variable
489 * name referenced by var_ref, and used when
490 * printing the action. Because var_ref
491 * creation is deferred to create_actions(),
492 * we need a per-action way to save it until
493 * then, thus var_str.
494 */
50450603 495 char *var_str;
466f4528
TZ		 496
497 /*
498 * var_ref refers to the variable being
499 * tracked e.g onmax($var).
500 */
501 struct hist_field *var_ref;
502
503 /*
504 * track_var contains the 'invisible' tracking
505 * variable created to keep the current
506 * e.g. max value.
507 */
508 struct hist_field *track_var;
509
510 check_track_val_fn_t check_val;
511 action_fn_t save_data;
512 } track_data;
c282a386 513 };
7ef224d1
TZ		 514};
515
a3785b7e
TZ		 516struct track_data {
517 u64 track_val;
518 bool updated;
519
520 unsigned int key_len;
521 void *key;
522 struct tracing_map_elt elt;
523
524 struct action_data *action_data;
525 struct hist_trigger_data *hist_data;
526};
527
528struct hist_elt_data {
529 char *comm;
530 u64 *var_ref_vals;
531 char *field_var_str[SYNTH_FIELDS_MAX];
532};
533
534struct snapshot_context {
535 struct tracing_map_elt *elt;
536 void *key;
537};
538
539static void track_data_free(struct track_data *track_data)
540{
541 struct hist_elt_data *elt_data;
542
543 if (!track_data)
544 return;
545
546 kfree(track_data->key);
547
548 elt_data = track_data->elt.private_data;
549 if (elt_data) {
550 kfree(elt_data->comm);
551 kfree(elt_data);
552 }
553
554 kfree(track_data);
555}
556
557static struct track_data *track_data_alloc(unsigned int key_len,
558 struct action_data *action_data,
559 struct hist_trigger_data *hist_data)
560{
561 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
562 struct hist_elt_data *elt_data;
563
564 if (!data)
565 return ERR_PTR(-ENOMEM);
566
567 data->key = kzalloc(key_len, GFP_KERNEL);
568 if (!data->key) {
569 track_data_free(data);
570 return ERR_PTR(-ENOMEM);
571 }
572
573 data->key_len = key_len;
574 data->action_data = action_data;
575 data->hist_data = hist_data;
576
577 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
578 if (!elt_data) {
579 track_data_free(data);
580 return ERR_PTR(-ENOMEM);
581 }
582 data->elt.private_data = elt_data;
583
584 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
585 if (!elt_data->comm) {
586 track_data_free(data);
587 return ERR_PTR(-ENOMEM);
588 }
589
590 return data;
591}
592
a1a05bb4
TZ		 593static char last_cmd[MAX_FILTER_STR_VAL];
594static char last_cmd_loc[MAX_FILTER_STR_VAL];
f404da6e 595
d566c5e9 596static int errpos(char *str)
f404da6e 597{
d566c5e9 598 return err_pos(last_cmd, str);
f404da6e
TZ		 599}
600
a1a05bb4 601static void last_cmd_set(struct trace_event_file *file, char *str)
f404da6e 602{
a1a05bb4
TZ		 603 const char *system = NULL, *name = NULL;
604 struct trace_event_call *call;
f404da6e
TZ		 605
606 if (!str)
607 return;
608
a1a05bb4 609 strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
f404da6e 610
a1a05bb4
TZ		 611 if (file) {
612 call = file->event_call;
f404da6e 613
a1a05bb4
TZ		 614 system = call->class->system;
615 if (system) {
616 name = trace_event_name(call);
617 if (!name)
618 system = NULL;
619 }
620 }
f404da6e 621
a1a05bb4
TZ		 622 if (system)
623 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
f404da6e
TZ		 624}
625
d0cd871b 626static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
f404da6e 627{
2f754e77
SRV		 628 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
629 err_type, err_pos);
f404da6e
TZ		 630}
631
632static void hist_err_clear(void)
633{
a1a05bb4
TZ		 634 last_cmd[0] = '\0';
635 last_cmd_loc[0] = '\0';
f404da6e
TZ		 636}
637
4b147936
TZ		 638struct synth_trace_event {
639 struct trace_entry ent;
640 u64 fields[];
641};
642
643static int synth_event_define_fields(struct trace_event_call *call)
644{
645 struct synth_trace_event trace;
646 int offset = offsetof(typeof(trace), fields);
647 struct synth_event *event = call->data;
648 unsigned int i, size, n_u64;
649 char *name, *type;
650 bool is_signed;
651 int ret = 0;
652
653 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
654 size = event->fields[i]->size;
655 is_signed = event->fields[i]->is_signed;
656 type = event->fields[i]->type;
657 name = event->fields[i]->name;
658 ret = trace_define_field(call, type, name, offset, size,
659 is_signed, FILTER_OTHER);
660 if (ret)
661 break;
662
663 if (event->fields[i]->is_string) {
664 offset += STR_VAR_LEN_MAX;
665 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
666 } else {
667 offset += sizeof(u64);
668 n_u64++;
669 }
670 }
671
672 event->n_u64 = n_u64;
673
674 return ret;
675}
676
677static bool synth_field_signed(char *type)
678{
b6b27355 679 if (str_has_prefix(type, "u"))
4b147936
TZ		 680 return false;
681
682 return true;
683}
684
685static int synth_field_is_string(char *type)
686{
687 if (strstr(type, "char[") != NULL)
688 return true;
689
690 return false;
691}
692
693static int synth_field_string_size(char *type)
694{
695 char buf[4], *end, *start;
696 unsigned int len;
697 int size, err;
698
699 start = strstr(type, "char[");
700 if (start == NULL)
701 return -EINVAL;
2f31ed93 702 start += sizeof("char[") - 1;
4b147936
TZ		 703
704 end = strchr(type, ']');
705 if (!end || end < start)
706 return -EINVAL;
707
708 len = end - start;
709 if (len > 3)
710 return -EINVAL;
711
712 strncpy(buf, start, len);
713 buf[len] = '\0';
714
715 err = kstrtouint(buf, 0, &size);
716 if (err)
717 return err;
718
719 if (size > STR_VAR_LEN_MAX)
720 return -EINVAL;
721
722 return size;
723}
724
725static int synth_field_size(char *type)
726{
727 int size = 0;
728
729 if (strcmp(type, "s64") == 0)
730 size = sizeof(s64);
731 else if (strcmp(type, "u64") == 0)
732 size = sizeof(u64);
733 else if (strcmp(type, "s32") == 0)
734 size = sizeof(s32);
735 else if (strcmp(type, "u32") == 0)
736 size = sizeof(u32);
737 else if (strcmp(type, "s16") == 0)
738 size = sizeof(s16);
739 else if (strcmp(type, "u16") == 0)
740 size = sizeof(u16);
741 else if (strcmp(type, "s8") == 0)
742 size = sizeof(s8);
743 else if (strcmp(type, "u8") == 0)
744 size = sizeof(u8);
745 else if (strcmp(type, "char") == 0)
746 size = sizeof(char);
747 else if (strcmp(type, "unsigned char") == 0)
748 size = sizeof(unsigned char);
749 else if (strcmp(type, "int") == 0)
750 size = sizeof(int);
751 else if (strcmp(type, "unsigned int") == 0)
752 size = sizeof(unsigned int);
753 else if (strcmp(type, "long") == 0)
754 size = sizeof(long);
755 else if (strcmp(type, "unsigned long") == 0)
756 size = sizeof(unsigned long);
757 else if (strcmp(type, "pid_t") == 0)
758 size = sizeof(pid_t);
ac681546
ZX		 759 else if (strcmp(type, "gfp_t") == 0)
760 size = sizeof(gfp_t);
4b147936
TZ		 761 else if (synth_field_is_string(type))
762 size = synth_field_string_size(type);
763
764 return size;
765}
766
767static const char *synth_field_fmt(char *type)
768{
769 const char *fmt = "%llu";
770
771 if (strcmp(type, "s64") == 0)
772 fmt = "%lld";
773 else if (strcmp(type, "u64") == 0)
774 fmt = "%llu";
775 else if (strcmp(type, "s32") == 0)
776 fmt = "%d";
777 else if (strcmp(type, "u32") == 0)
778 fmt = "%u";
779 else if (strcmp(type, "s16") == 0)
780 fmt = "%d";
781 else if (strcmp(type, "u16") == 0)
782 fmt = "%u";
783 else if (strcmp(type, "s8") == 0)
784 fmt = "%d";
785 else if (strcmp(type, "u8") == 0)
786 fmt = "%u";
787 else if (strcmp(type, "char") == 0)
788 fmt = "%d";
789 else if (strcmp(type, "unsigned char") == 0)
790 fmt = "%u";
791 else if (strcmp(type, "int") == 0)
792 fmt = "%d";
793 else if (strcmp(type, "unsigned int") == 0)
794 fmt = "%u";
795 else if (strcmp(type, "long") == 0)
796 fmt = "%ld";
797 else if (strcmp(type, "unsigned long") == 0)
798 fmt = "%lu";
799 else if (strcmp(type, "pid_t") == 0)
800 fmt = "%d";
ac681546
ZX		 801 else if (strcmp(type, "gfp_t") == 0)
802 fmt = "%x";
4b147936
TZ		 803 else if (synth_field_is_string(type))
804 fmt = "%s";
805
806 return fmt;
807}
808
809static enum print_line_t print_synth_event(struct trace_iterator *iter,
810 int flags,
811 struct trace_event *event)
812{
813 struct trace_array *tr = iter->tr;
814 struct trace_seq *s = &iter->seq;
815 struct synth_trace_event *entry;
816 struct synth_event *se;
817 unsigned int i, n_u64;
818 char print_fmt[32];
819 const char *fmt;
820
821 entry = (struct synth_trace_event *)iter->ent;
822 se = container_of(event, struct synth_event, call.event);
823
824 trace_seq_printf(s, "%s: ", se->name);
825
826 for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
827 if (trace_seq_has_overflowed(s))
828 goto end;
829
830 fmt = synth_field_fmt(se->fields[i]->type);
831
832 /* parameter types */
833 if (tr->trace_flags & TRACE_ITER_VERBOSE)
834 trace_seq_printf(s, "%s ", fmt);
835
836 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
837
838 /* parameter values */
839 if (se->fields[i]->is_string) {
840 trace_seq_printf(s, print_fmt, se->fields[i]->name,
841 (char *)&entry->fields[n_u64],
842 i == se->n_fields - 1 ? "" : " ");
843 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
844 } else {
ac681546
ZX		 845 struct trace_print_flags __flags[] = {
846 __def_gfpflag_names, {-1, NULL} };
847
4b147936
TZ		 848 trace_seq_printf(s, print_fmt, se->fields[i]->name,
849 entry->fields[n_u64],
850 i == se->n_fields - 1 ? "" : " ");
ac681546
ZX		 851
852 if (strcmp(se->fields[i]->type, "gfp_t") == 0) {
853 trace_seq_puts(s, " (");
854 trace_print_flags_seq(s, "|",
855 entry->fields[n_u64],
856 __flags);
857 trace_seq_putc(s, ')');
858 }
4b147936
TZ		 859 n_u64++;
860 }
861 }
862end:
863 trace_seq_putc(s, '\n');
864
865 return trace_handle_return(s);
866}
867
868static struct trace_event_functions synth_event_funcs = {
869 .trace = print_synth_event
870};
871
872static notrace void trace_event_raw_event_synth(void *__data,
873 u64 *var_ref_vals,
874 unsigned int var_ref_idx)
875{
876 struct trace_event_file *trace_file = __data;
877 struct synth_trace_event *entry;
878 struct trace_event_buffer fbuffer;
4708abc6 879 struct ring_buffer *buffer;
4b147936
TZ		 880 struct synth_event *event;
881 unsigned int i, n_u64;
882 int fields_size = 0;
883
884 event = trace_file->event_call->data;
885
886 if (trace_trigger_soft_disabled(trace_file))
887 return;
888
889 fields_size = event->n_u64 * sizeof(u64);
890
4708abc6
SRV		 891 /*
892 * Avoid ring buffer recursion detection, as this event
893 * is being performed within another event.
894 */
895 buffer = trace_file->tr->trace_buffer.buffer;
896 ring_buffer_nest_start(buffer);
897
4b147936
TZ		 898 entry = trace_event_buffer_reserve(&fbuffer, trace_file,
899 sizeof(*entry) + fields_size);
900 if (!entry)
4708abc6 901 goto out;
4b147936
TZ		 902
903 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
904 if (event->fields[i]->is_string) {
905 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
906 char *str_field = (char *)&entry->fields[n_u64];
907
ad452870 908 strscpy(str_field, str_val, STR_VAR_LEN_MAX);
4b147936
TZ		 909 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
910 } else {
911 entry->fields[n_u64] = var_ref_vals[var_ref_idx + i];
912 n_u64++;
913 }
914 }
915
916 trace_event_buffer_commit(&fbuffer);
4708abc6
SRV		 917out:
918 ring_buffer_nest_end(buffer);
4b147936
TZ		 919}
920
921static void free_synth_event_print_fmt(struct trace_event_call *call)
922{
923 if (call) {
924 kfree(call->print_fmt);
925 call->print_fmt = NULL;
926 }
927}
928
929static int __set_synth_event_print_fmt(struct synth_event *event,
930 char *buf, int len)
931{
932 const char *fmt;
933 int pos = 0;
934 int i;
935
936 /* When len=0, we just calculate the needed length */
937#define LEN_OR_ZERO (len ? len - pos : 0)
938
939 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
940 for (i = 0; i < event->n_fields; i++) {
941 fmt = synth_field_fmt(event->fields[i]->type);
942 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
943 event->fields[i]->name, fmt,
944 i == event->n_fields - 1 ? "" : ", ");
945 }
946 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
947
948 for (i = 0; i < event->n_fields; i++) {
949 pos += snprintf(buf + pos, LEN_OR_ZERO,
950 ", REC->%s", event->fields[i]->name);
951 }
952
953#undef LEN_OR_ZERO
954
955 /* return the length of print_fmt */
956 return pos;
957}
958
959static int set_synth_event_print_fmt(struct trace_event_call *call)
960{
961 struct synth_event *event = call->data;
962 char *print_fmt;
963 int len;
964
965 /* First: called with 0 length to calculate the needed length */
966 len = __set_synth_event_print_fmt(event, NULL, 0);
967
968 print_fmt = kmalloc(len + 1, GFP_KERNEL);
969 if (!print_fmt)
970 return -ENOMEM;
971
972 /* Second: actually write the @print_fmt */
973 __set_synth_event_print_fmt(event, print_fmt, len + 1);
974 call->print_fmt = print_fmt;
975
976 return 0;
977}
978
979static void free_synth_field(struct synth_field *field)
980{
981 kfree(field->type);
982 kfree(field->name);
983 kfree(field);
984}
985
7bbab38d 986static struct synth_field *parse_synth_field(int argc, const char **argv,
282447ba 987 int *consumed)
4b147936
TZ		 988{
989 struct synth_field *field;
7bbab38d 990 const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
4b147936 991 int len, ret = 0;
4b147936
TZ		 992
993 if (field_type[0] == ';')
994 field_type++;
995
282447ba
MH		 996 if (!strcmp(field_type, "unsigned")) {
997 if (argc < 3)
998 return ERR_PTR(-EINVAL);
999 prefix = "unsigned ";
1000 field_type = argv[1];
1001 field_name = argv[2];
1002 *consumed = 3;
1003 } else {
1004 field_name = argv[1];
1005 *consumed = 2;
1006 }
1007
4b147936
TZ		 1008 field = kzalloc(sizeof(*field), GFP_KERNEL);
1009 if (!field)
1010 return ERR_PTR(-ENOMEM);
1011
7bbab38d 1012 len = strlen(field_name);
4b147936 1013 array = strchr(field_name, '[');
7bbab38d
MH		 1014 if (array)
1015 len -= strlen(array);
1016 else if (field_name[len - 1] == ';')
1017 len--;
1018
1019 field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
1020 if (!field->name) {
1021 ret = -ENOMEM;
1022 goto free;
1023 }
1024
1025 if (field_type[0] == ';')
1026 field_type++;
1027 len = strlen(field_type) + 1;
4b147936
TZ		 1028 if (array)
1029 len += strlen(array);
282447ba
MH		 1030 if (prefix)
1031 len += strlen(prefix);
7bbab38d 1032
4b147936
TZ		 1033 field->type = kzalloc(len, GFP_KERNEL);
1034 if (!field->type) {
1035 ret = -ENOMEM;
1036 goto free;
1037 }
282447ba
MH		 1038 if (prefix)
1039 strcat(field->type, prefix);
4b147936
TZ		 1040 strcat(field->type, field_type);
1041 if (array) {
1042 strcat(field->type, array);
7bbab38d
MH		 1043 if (field->type[len - 1] == ';')
1044 field->type[len - 1] = '\0';
4b147936
TZ		 1045 }
1046
1047 field->size = synth_field_size(field->type);
1048 if (!field->size) {
1049 ret = -EINVAL;
1050 goto free;
1051 }
1052
1053 if (synth_field_is_string(field->type))
1054 field->is_string = true;
1055
1056 field->is_signed = synth_field_signed(field->type);
1057
4b147936
TZ		 1058 out:
1059 return field;
1060 free:
1061 free_synth_field(field);
1062 field = ERR_PTR(ret);
1063 goto out;
1064}
1065
1066static void free_synth_tracepoint(struct tracepoint *tp)
1067{
1068 if (!tp)
1069 return;
1070
1071 kfree(tp->name);
1072 kfree(tp);
1073}
1074
1075static struct tracepoint *alloc_synth_tracepoint(char *name)
1076{
1077 struct tracepoint *tp;
1078
1079 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
1080 if (!tp)
1081 return ERR_PTR(-ENOMEM);
1082
1083 tp->name = kstrdup(name, GFP_KERNEL);
1084 if (!tp->name) {
1085 kfree(tp);
1086 return ERR_PTR(-ENOMEM);
1087 }
1088
1089 return tp;
1090}
1091
1092typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
1093 unsigned int var_ref_idx);
1094
1095static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
1096 unsigned int var_ref_idx)
1097{
1098 struct tracepoint *tp = event->tp;
1099
1100 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
1101 struct tracepoint_func *probe_func_ptr;
1102 synth_probe_func_t probe_func;
1103 void *__data;
1104
1105 if (!(cpu_online(raw_smp_processor_id())))
1106 return;
1107
1108 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
1109 if (probe_func_ptr) {
1110 do {
1111 probe_func = probe_func_ptr->func;
1112 __data = probe_func_ptr->data;
1113 probe_func(__data, var_ref_vals, var_ref_idx);
1114 } while ((++probe_func_ptr)->func);
1115 }
1116 }
1117}
1118
1119static struct synth_event *find_synth_event(const char *name)
1120{
7bbab38d 1121 struct dyn_event *pos;
4b147936
TZ		 1122 struct synth_event *event;
1123
7bbab38d
MH		 1124 for_each_dyn_event(pos) {
1125 if (!is_synth_event(pos))
1126 continue;
1127 event = to_synth_event(pos);
4b147936
TZ		 1128 if (strcmp(event->name, name) == 0)
1129 return event;
1130 }
1131
1132 return NULL;
1133}
1134
1135static int register_synth_event(struct synth_event *event)
1136{
1137 struct trace_event_call *call = &event->call;
1138 int ret = 0;
1139
1140 event->call.class = &event->class;
1141 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
1142 if (!event->class.system) {
1143 ret = -ENOMEM;
1144 goto out;
1145 }
1146
1147 event->tp = alloc_synth_tracepoint(event->name);
1148 if (IS_ERR(event->tp)) {
1149 ret = PTR_ERR(event->tp);
1150 event->tp = NULL;
1151 goto out;
1152 }
1153
1154 INIT_LIST_HEAD(&call->class->fields);
1155 call->event.funcs = &synth_event_funcs;
1156 call->class->define_fields = synth_event_define_fields;
1157
1158 ret = register_trace_event(&call->event);
1159 if (!ret) {
1160 ret = -ENODEV;
1161 goto out;
1162 }
1163 call->flags = TRACE_EVENT_FL_TRACEPOINT;
1164 call->class->reg = trace_event_reg;
1165 call->class->probe = trace_event_raw_event_synth;
1166 call->data = event;
1167 call->tp = event->tp;
1168
7e1413ed 1169 ret = trace_add_event_call(call);
4b147936
TZ		 1170 if (ret) {
1171 pr_warn("Failed to register synthetic event: %s\n",
1172 trace_event_name(call));
1173 goto err;
1174 }
1175
1176 ret = set_synth_event_print_fmt(call);
1177 if (ret < 0) {
7e1413ed 1178 trace_remove_event_call(call);
4b147936
TZ		 1179 goto err;
1180 }
1181 out:
1182 return ret;
1183 err:
1184 unregister_trace_event(&call->event);
1185 goto out;
1186}
1187
1188static int unregister_synth_event(struct synth_event *event)
1189{
1190 struct trace_event_call *call = &event->call;
1191 int ret;
1192
7e1413ed 1193 ret = trace_remove_event_call(call);
4b147936
TZ		 1194
1195 return ret;
1196}
1197
1198static void free_synth_event(struct synth_event *event)
1199{
1200 unsigned int i;
1201
1202 if (!event)
1203 return;
1204
1205 for (i = 0; i < event->n_fields; i++)
1206 free_synth_field(event->fields[i]);
1207
1208 kfree(event->fields);
1209 kfree(event->name);
1210 kfree(event->class.system);
1211 free_synth_tracepoint(event->tp);
1212 free_synth_event_print_fmt(&event->call);
1213 kfree(event);
1214}
1215
7bbab38d 1216static struct synth_event *alloc_synth_event(const char *name, int n_fields,
4b147936
TZ		 1217 struct synth_field **fields)
1218{
1219 struct synth_event *event;
1220 unsigned int i;
1221
1222 event = kzalloc(sizeof(*event), GFP_KERNEL);
1223 if (!event) {
1224 event = ERR_PTR(-ENOMEM);
1225 goto out;
1226 }
1227
7bbab38d 1228 event->name = kstrdup(name, GFP_KERNEL);
4b147936
TZ		 1229 if (!event->name) {
1230 kfree(event);
1231 event = ERR_PTR(-ENOMEM);
1232 goto out;
1233 }
1234
1235 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
1236 if (!event->fields) {
1237 free_synth_event(event);
1238 event = ERR_PTR(-ENOMEM);
1239 goto out;
1240 }
1241
7bbab38d
MH		 1242 dyn_event_init(&event->devent, &synth_event_ops);
1243
4b147936
TZ		 1244 for (i = 0; i < n_fields; i++)
1245 event->fields[i] = fields[i];
1246
1247 event->n_fields = n_fields;
1248 out:
1249 return event;
1250}
1251
c282a386
TZ		 1252static void action_trace(struct hist_trigger_data *hist_data,
1253 struct tracing_map_elt *elt, void *rec,
7d18a10c 1254 struct ring_buffer_event *rbe, void *key,
c282a386
TZ		 1255 struct action_data *data, u64 *var_ref_vals)
1256{
c3e49506 1257 struct synth_event *event = data->synth_event;
c282a386 1258
c3e49506 1259 trace_synth(event, var_ref_vals, data->var_ref_idx);
c282a386
TZ		 1260}
1261
1262struct hist_var_data {
1263 struct list_head list;
1264 struct hist_trigger_data *hist_data;
1265};
1266
7bbab38d 1267static int __create_synth_event(int argc, const char *name, const char **argv)
4b147936
TZ		 1268{
1269 struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
1270 struct synth_event *event = NULL;
282447ba 1271 int i, consumed = 0, n_fields = 0, ret = 0;
4b147936
TZ		 1272
1273 /*
1274 * Argument syntax:
1275 * - Add synthetic event: <event_name> field[;field] ...
1276 * - Remove synthetic event: !<event_name> field[;field] ...
1277 * where 'field' = type field_name
1278 */
4b147936 1279
7bbab38d
MH		 1280 if (name[0] == '\0' || argc < 1)
1281 return -EINVAL;
1282
1283 mutex_lock(&event_mutex);
4b147936
TZ		 1284
1285 event = find_synth_event(name);
1286 if (event) {
7bbab38d 1287 ret = -EEXIST;
4b147936 1288 goto out;
18858511 1289 }
4b147936 1290
7bbab38d 1291 for (i = 0; i < argc - 1; i++) {
4b147936
TZ		 1292 if (strcmp(argv[i], ";") == 0)
1293 continue;
1294 if (n_fields == SYNTH_FIELDS_MAX) {
1295 ret = -EINVAL;
1296 goto err;
1297 }
1298
282447ba 1299 field = parse_synth_field(argc - i, &argv[i], &consumed);
4b147936
TZ		 1300 if (IS_ERR(field)) {
1301 ret = PTR_ERR(field);
1302 goto err;
1303 }
282447ba
MH		 1304 fields[n_fields++] = field;
1305 i += consumed - 1;
4b147936
TZ		 1306 }
1307
a360d9e4 1308 if (i < argc && strcmp(argv[i], ";") != 0) {
4b147936
TZ		 1309 ret = -EINVAL;
1310 goto err;
1311 }
1312
1313 event = alloc_synth_event(name, n_fields, fields);
1314 if (IS_ERR(event)) {
1315 ret = PTR_ERR(event);
1316 event = NULL;
1317 goto err;
1318 }
faacb361
MH		 1319 ret = register_synth_event(event);
1320 if (!ret)
7bbab38d 1321 dyn_event_add(&event->devent);
faacb361
MH		 1322 else
1323 free_synth_event(event);
4b147936 1324 out:
fc800a10 1325 mutex_unlock(&event_mutex);
4b147936
TZ		 1326
1327 return ret;
1328 err:
4b147936
TZ		 1329 for (i = 0; i < n_fields; i++)
1330 free_synth_field(fields[i]);
4b147936 1331
faacb361 1332 goto out;
4b147936
TZ		 1333}
1334
7bbab38d 1335static int create_or_delete_synth_event(int argc, char **argv)
4b147936 1336{
7bbab38d
MH		 1337 const char *name = argv[0];
1338 struct synth_event *event = NULL;
1339 int ret;
4b147936 1340
7bbab38d
MH		 1341 /* trace_run_command() ensures argc != 0 */
1342 if (name[0] == '!') {
1343 mutex_lock(&event_mutex);
7bbab38d
MH		 1344 event = find_synth_event(name + 1);
1345 if (event) {
1346 if (event->ref)
1347 ret = -EBUSY;
1348 else {
1349 ret = unregister_synth_event(event);
1350 if (!ret) {
1351 dyn_event_remove(&event->devent);
1352 free_synth_event(event);
1353 }
1354 }
faacb361 1355 } else
7bbab38d 1356 ret = -ENOENT;
7bbab38d
MH		 1357 mutex_unlock(&event_mutex);
1358 return ret;
4b147936
TZ		 1359 }
1360
7bbab38d
MH		 1361 ret = __create_synth_event(argc - 1, name, (const char **)argv + 1);
1362 return ret == -ECANCELED ? -EINVAL : ret;
4b147936
TZ		 1363}
1364
7bbab38d 1365static int synth_event_create(int argc, const char **argv)
4b147936 1366{
7bbab38d
MH		 1367 const char *name = argv[0];
1368 int len;
4b147936 1369
7bbab38d
MH		 1370 if (name[0] != 's' || name[1] != ':')
1371 return -ECANCELED;
1372 name += 2;
4b147936 1373
7bbab38d
MH		 1374 /* This interface accepts group name prefix */
1375 if (strchr(name, '/')) {
ed581aaf
TZ		 1376 len = str_has_prefix(name, SYNTH_SYSTEM "/");
1377 if (len == 0)
7bbab38d
MH		 1378 return -EINVAL;
1379 name += len;
1380 }
1381 return __create_synth_event(argc - 1, name, argv + 1);
4b147936
TZ		 1382}
1383
7bbab38d 1384static int synth_event_release(struct dyn_event *ev)
4b147936 1385{
7bbab38d
MH		 1386 struct synth_event *event = to_synth_event(ev);
1387 int ret;
1388
1389 if (event->ref)
1390 return -EBUSY;
1391
1392 ret = unregister_synth_event(event);
1393 if (ret)
1394 return ret;
1395
1396 dyn_event_remove(ev);
1397 free_synth_event(event);
1398 return 0;
4b147936
TZ		 1399}
1400
7bbab38d 1401static int __synth_event_show(struct seq_file *m, struct synth_event *event)
4b147936
TZ		 1402{
1403 struct synth_field *field;
4b147936
TZ		 1404 unsigned int i;
1405
1406 seq_printf(m, "%s\t", event->name);
1407
1408 for (i = 0; i < event->n_fields; i++) {
1409 field = event->fields[i];
1410
1411 /* parameter values */
1412 seq_printf(m, "%s %s%s", field->type, field->name,
1413 i == event->n_fields - 1 ? "" : "; ");
1414 }
1415
1416 seq_putc(m, '\n');
1417
1418 return 0;
1419}
1420
7bbab38d
MH		 1421static int synth_event_show(struct seq_file *m, struct dyn_event *ev)
1422{
1423 struct synth_event *event = to_synth_event(ev);
1424
1425 seq_printf(m, "s:%s/", event->class.system);
1426
1427 return __synth_event_show(m, event);
1428}
1429
1430static int synth_events_seq_show(struct seq_file *m, void *v)
1431{
1432 struct dyn_event *ev = v;
1433
1434 if (!is_synth_event(ev))
1435 return 0;
1436
1437 return __synth_event_show(m, to_synth_event(ev));
1438}
1439
4b147936 1440static const struct seq_operations synth_events_seq_op = {
7bbab38d
MH		 1441 .start = dyn_event_seq_start,
1442 .next = dyn_event_seq_next,
1443 .stop = dyn_event_seq_stop,
1444 .show = synth_events_seq_show,
4b147936
TZ		 1445};
1446
1447static int synth_events_open(struct inode *inode, struct file *file)
1448{
1449 int ret;
1450
1451 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
7bbab38d 1452 ret = dyn_events_release_all(&synth_event_ops);
4b147936
TZ		 1453 if (ret < 0)
1454 return ret;
1455 }
1456
1457 return seq_open(file, &synth_events_seq_op);
1458}
1459
1460static ssize_t synth_events_write(struct file *file,
1461 const char __user *buffer,
1462 size_t count, loff_t *ppos)
1463{
1464 return trace_parse_run_command(file, buffer, count, ppos,
7bbab38d 1465 create_or_delete_synth_event);
4b147936
TZ		 1466}
1467
1468static const struct file_operations synth_events_fops = {
1469 .open = synth_events_open,
1470 .write = synth_events_write,
1471 .read = seq_read,
1472 .llseek = seq_lseek,
1473 .release = seq_release,
1474};
1475
df35d93b
TZ		 1476static u64 hist_field_timestamp(struct hist_field *hist_field,
1477 struct tracing_map_elt *elt,
1478 struct ring_buffer_event *rbe,
1479 void *event)
860f9f6b
TZ		 1480{
1481 struct hist_trigger_data *hist_data = hist_field->hist_data;
1482 struct trace_array *tr = hist_data->event_file->tr;
1483
1484 u64 ts = ring_buffer_event_time_stamp(rbe);
1485
1486 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
1487 ts = ns2usecs(ts);
1488
1489 return ts;
1490}
1491
8b7622bf
TZ		 1492static u64 hist_field_cpu(struct hist_field *hist_field,
1493 struct tracing_map_elt *elt,
1494 struct ring_buffer_event *rbe,
1495 void *event)
1496{
1497 int cpu = smp_processor_id();
1498
1499 return cpu;
1500}
1501
de40f033
TZ		 1502/**
1503 * check_field_for_var_ref - Check if a VAR_REF field references a variable
1504 * @hist_field: The VAR_REF field to check
1505 * @var_data: The hist trigger that owns the variable
1506 * @var_idx: The trigger variable identifier
1507 *
1508 * Check the given VAR_REF field to see whether or not it references
1509 * the given variable associated with the given trigger.
1510 *
1511 * Return: The VAR_REF field if it does reference the variable, NULL if not
1512 */
067fe038
TZ		 1513static struct hist_field *
1514check_field_for_var_ref(struct hist_field *hist_field,
1515 struct hist_trigger_data *var_data,
1516 unsigned int var_idx)
1517{
e4f6d245 1518 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
067fe038 1519
e4f6d245
TZ		 1520 if (hist_field && hist_field->var.idx == var_idx &&
1521 hist_field->var.hist_data == var_data)
1522 return hist_field;
067fe038 1523
e4f6d245 1524 return NULL;
067fe038
TZ		 1525}
1526
de40f033
TZ		 1527/**
1528 * find_var_ref - Check if a trigger has a reference to a trigger variable
1529 * @hist_data: The hist trigger that might have a reference to the variable
1530 * @var_data: The hist trigger that owns the variable
1531 * @var_idx: The trigger variable identifier
1532 *
1533 * Check the list of var_refs[] on the first hist trigger to see
1534 * whether any of them are references to the variable on the second
1535 * trigger.
1536 *
1537 * Return: The VAR_REF field referencing the variable if so, NULL if not
1538 */
067fe038
TZ		 1539static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
1540 struct hist_trigger_data *var_data,
1541 unsigned int var_idx)
1542{
e4f6d245 1543 struct hist_field *hist_field;
067fe038
TZ		 1544 unsigned int i;
1545
e4f6d245
TZ		 1546 for (i = 0; i < hist_data->n_var_refs; i++) {
1547 hist_field = hist_data->var_refs[i];
1548 if (check_field_for_var_ref(hist_field, var_data, var_idx))
1549 return hist_field;
067fe038
TZ		 1550 }
1551
e4f6d245 1552 return NULL;
067fe038
TZ		 1553}
1554
de40f033
TZ		 1555/**
1556 * find_any_var_ref - Check if there is a reference to a given trigger variable
1557 * @hist_data: The hist trigger
1558 * @var_idx: The trigger variable identifier
1559 *
1560 * Check to see whether the given variable is currently referenced by
1561 * any other trigger.
1562 *
1563 * The trigger the variable is defined on is explicitly excluded - the
1564 * assumption being that a self-reference doesn't prevent a trigger
1565 * from being removed.
1566 *
1567 * Return: The VAR_REF field referencing the variable if so, NULL if not
1568 */
067fe038
TZ		 1569static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
1570 unsigned int var_idx)
1571{
1572 struct trace_array *tr = hist_data->event_file->tr;
1573 struct hist_field *found = NULL;
1574 struct hist_var_data *var_data;
1575
1576 list_for_each_entry(var_data, &tr->hist_vars, list) {
1577 if (var_data->hist_data == hist_data)
1578 continue;
1579 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
1580 if (found)
1581 break;
1582 }
1583
1584 return found;
1585}
1586
de40f033
TZ		 1587/**
1588 * check_var_refs - Check if there is a reference to any of trigger's variables
1589 * @hist_data: The hist trigger
1590 *
1591 * A trigger can define one or more variables. If any one of them is
1592 * currently referenced by any other trigger, this function will
1593 * determine that.
1594
1595 * Typically used to determine whether or not a trigger can be removed
1596 * - if there are any references to a trigger's variables, it cannot.
1597 *
1598 * Return: True if there is a reference to any of trigger's variables
1599 */
067fe038
TZ		 1600static bool check_var_refs(struct hist_trigger_data *hist_data)
1601{
1602 struct hist_field *field;
1603 bool found = false;
1604 int i;
1605
1606 for_each_hist_field(i, hist_data) {
1607 field = hist_data->fields[i];
1608 if (field && field->flags & HIST_FIELD_FL_VAR) {
1609 if (find_any_var_ref(hist_data, field->var.idx)) {
1610 found = true;
1611 break;
1612 }
1613 }
1614 }
1615
1616 return found;
1617}
1618
1619static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1620{
1621 struct trace_array *tr = hist_data->event_file->tr;
1622 struct hist_var_data *var_data, *found = NULL;
1623
1624 list_for_each_entry(var_data, &tr->hist_vars, list) {
1625 if (var_data->hist_data == hist_data) {
1626 found = var_data;
1627 break;
1628 }
1629 }
1630
1631 return found;
1632}
1633
1634static bool field_has_hist_vars(struct hist_field *hist_field,
1635 unsigned int level)
1636{
1637 int i;
1638
1639 if (level > 3)
1640 return false;
1641
1642 if (!hist_field)
1643 return false;
1644
1645 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1646 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1647 return true;
1648
1649 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1650 struct hist_field *operand;
1651
1652 operand = hist_field->operands[i];
1653 if (field_has_hist_vars(operand, level + 1))
1654 return true;
1655 }
1656
1657 return false;
1658}
1659
1660static bool has_hist_vars(struct hist_trigger_data *hist_data)
1661{
1662 struct hist_field *hist_field;
1663 int i;
1664
1665 for_each_hist_field(i, hist_data) {
1666 hist_field = hist_data->fields[i];
1667 if (field_has_hist_vars(hist_field, 0))
1668 return true;
1669 }
1670
1671 return false;
1672}
1673
1674static int save_hist_vars(struct hist_trigger_data *hist_data)
1675{
1676 struct trace_array *tr = hist_data->event_file->tr;
1677 struct hist_var_data *var_data;
1678
1679 var_data = find_hist_vars(hist_data);
1680 if (var_data)
1681 return 0;
1682
1683 if (trace_array_get(tr) < 0)
1684 return -ENODEV;
1685
1686 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1687 if (!var_data) {
1688 trace_array_put(tr);
1689 return -ENOMEM;
1690 }
1691
1692 var_data->hist_data = hist_data;
1693 list_add(&var_data->list, &tr->hist_vars);
1694
1695 return 0;
1696}
1697
1698static void remove_hist_vars(struct hist_trigger_data *hist_data)
1699{
1700 struct trace_array *tr = hist_data->event_file->tr;
1701 struct hist_var_data *var_data;
1702
1703 var_data = find_hist_vars(hist_data);
1704 if (!var_data)
1705 return;
1706
1707 if (WARN_ON(check_var_refs(hist_data)))
1708 return;
1709
1710 list_del(&var_data->list);
1711
1712 kfree(var_data);
1713
1714 trace_array_put(tr);
1715}
1716
30350d65
TZ		 1717static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1718 const char *var_name)
1719{
1720 struct hist_field *hist_field, *found = NULL;
1721 int i;
1722
1723 for_each_hist_field(i, hist_data) {
1724 hist_field = hist_data->fields[i];
1725 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1726 strcmp(hist_field->var.name, var_name) == 0) {
1727 found = hist_field;
1728 break;
1729 }
1730 }
1731
1732 return found;
1733}
1734
1735static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1736 struct trace_event_file *file,
1737 const char *var_name)
1738{
1739 struct hist_trigger_data *test_data;
1740 struct event_trigger_data *test;
1741 struct hist_field *hist_field;
1742
1743 hist_field = find_var_field(hist_data, var_name);
1744 if (hist_field)
1745 return hist_field;
1746
1747 list_for_each_entry_rcu(test, &file->triggers, list) {
1748 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1749 test_data = test->private_data;
1750 hist_field = find_var_field(test_data, var_name);
1751 if (hist_field)
1752 return hist_field;
1753 }
1754 }
1755
1756 return NULL;
1757}
1758
067fe038
TZ		 1759static struct trace_event_file *find_var_file(struct trace_array *tr,
1760 char *system,
1761 char *event_name,
1762 char *var_name)
1763{
1764 struct hist_trigger_data *var_hist_data;
1765 struct hist_var_data *var_data;
1766 struct trace_event_file *file, *found = NULL;
1767
1768 if (system)
1769 return find_event_file(tr, system, event_name);
1770
1771 list_for_each_entry(var_data, &tr->hist_vars, list) {
1772 var_hist_data = var_data->hist_data;
1773 file = var_hist_data->event_file;
1774 if (file == found)
1775 continue;
1776
1777 if (find_var_field(var_hist_data, var_name)) {
f404da6e 1778 if (found) {
d0cd871b 1779 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
067fe038 1780 return NULL;
f404da6e 1781 }
067fe038
TZ		 1782
1783 found = file;
1784 }
1785 }
1786
1787 return found;
1788}
1789
1790static struct hist_field *find_file_var(struct trace_event_file *file,
1791 const char *var_name)
1792{
1793 struct hist_trigger_data *test_data;
1794 struct event_trigger_data *test;
1795 struct hist_field *hist_field;
1796
1797 list_for_each_entry_rcu(test, &file->triggers, list) {
1798 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1799 test_data = test->private_data;
1800 hist_field = find_var_field(test_data, var_name);
1801 if (hist_field)
1802 return hist_field;
1803 }
1804 }
1805
1806 return NULL;
1807}
1808
c282a386
TZ		 1809static struct hist_field *
1810find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1811{
1812 struct trace_array *tr = hist_data->event_file->tr;
1813 struct hist_field *hist_field, *found = NULL;
1814 struct trace_event_file *file;
1815 unsigned int i;
1816
1817 for (i = 0; i < hist_data->n_actions; i++) {
1818 struct action_data *data = hist_data->actions[i];
1819
7d18a10c 1820 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 1821 char *system = data->match_data.event_system;
1822 char *event_name = data->match_data.event;
c282a386
TZ		 1823
1824 file = find_var_file(tr, system, event_name, var_name);
1825 if (!file)
1826 continue;
1827 hist_field = find_file_var(file, var_name);
1828 if (hist_field) {
1829 if (found) {
d0cd871b
SRV		 1830 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1831 errpos(var_name));
c282a386
TZ		 1832 return ERR_PTR(-EINVAL);
1833 }
1834
1835 found = hist_field;
1836 }
1837 }
1838 }
1839 return found;
1840}
1841
067fe038
TZ		 1842static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1843 char *system,
1844 char *event_name,
1845 char *var_name)
1846{
1847 struct trace_array *tr = hist_data->event_file->tr;
1848 struct hist_field *hist_field = NULL;
1849 struct trace_event_file *file;
1850
c282a386
TZ		 1851 if (!system || !event_name) {
1852 hist_field = find_match_var(hist_data, var_name);
1853 if (IS_ERR(hist_field))
1854 return NULL;
1855 if (hist_field)
1856 return hist_field;
1857 }
1858
067fe038
TZ		 1859 file = find_var_file(tr, system, event_name, var_name);
1860 if (!file)
1861 return NULL;
1862
1863 hist_field = find_file_var(file, var_name);
1864
1865 return hist_field;
1866}
1867
067fe038
TZ		 1868static u64 hist_field_var_ref(struct hist_field *hist_field,
1869 struct tracing_map_elt *elt,
1870 struct ring_buffer_event *rbe,
1871 void *event)
1872{
1873 struct hist_elt_data *elt_data;
1874 u64 var_val = 0;
1875
55267c88
TZ		 1876 if (WARN_ON_ONCE(!elt))
1877 return var_val;
1878
067fe038
TZ		 1879 elt_data = elt->private_data;
1880 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1881
1882 return var_val;
1883}
1884
1885static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1886 u64 *var_ref_vals, bool self)
1887{
1888 struct hist_trigger_data *var_data;
1889 struct tracing_map_elt *var_elt;
1890 struct hist_field *hist_field;
1891 unsigned int i, var_idx;
1892 bool resolved = true;
1893 u64 var_val = 0;
1894
1895 for (i = 0; i < hist_data->n_var_refs; i++) {
1896 hist_field = hist_data->var_refs[i];
1897 var_idx = hist_field->var.idx;
1898 var_data = hist_field->var.hist_data;
1899
1900 if (var_data == NULL) {
1901 resolved = false;
1902 break;
1903 }
1904
1905 if ((self && var_data != hist_data) ||
1906 (!self && var_data == hist_data))
1907 continue;
1908
1909 var_elt = tracing_map_lookup(var_data->map, key);
1910 if (!var_elt) {
1911 resolved = false;
1912 break;
1913 }
1914
1915 if (!tracing_map_var_set(var_elt, var_idx)) {
1916 resolved = false;
1917 break;
1918 }
1919
1920 if (self || !hist_field->read_once)
1921 var_val = tracing_map_read_var(var_elt, var_idx);
1922 else
1923 var_val = tracing_map_read_var_once(var_elt, var_idx);
1924
1925 var_ref_vals[i] = var_val;
1926 }
1927
1928 return resolved;
1929}
1930
85013256
TZ		 1931static const char *hist_field_name(struct hist_field *field,
1932 unsigned int level)
1933{
1934 const char *field_name = "";
1935
1936 if (level > 1)
1937 return field_name;
1938
1939 if (field->field)
1940 field_name = field->field->name;
7e8b88a3
TZ		 1941 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1942 field->flags & HIST_FIELD_FL_ALIAS)
5819eadd 1943 field_name = hist_field_name(field->operands[0], ++level);
8b7622bf
TZ		 1944 else if (field->flags & HIST_FIELD_FL_CPU)
1945 field_name = "cpu";
067fe038
TZ		 1946 else if (field->flags & HIST_FIELD_FL_EXPR ||
1947 field->flags & HIST_FIELD_FL_VAR_REF) {
1948 if (field->system) {
1949 static char full_name[MAX_FILTER_STR_VAL];
1950
1951 strcat(full_name, field->system);
1952 strcat(full_name, ".");
1953 strcat(full_name, field->event_name);
1954 strcat(full_name, ".");
1955 strcat(full_name, field->name);
1956 field_name = full_name;
1957 } else
1958 field_name = field->name;
0ae7961e
TZ		 1959 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1960 field_name = "common_timestamp";
85013256
TZ		 1961
1962 if (field_name == NULL)
1963 field_name = "";
1964
1965 return field_name;
1966}
1967
7ef224d1
TZ		 1968static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1969{
1970 hist_field_fn_t fn = NULL;
1971
1972 switch (field_size) {
1973 case 8:
1974 if (field_is_signed)
1975 fn = hist_field_s64;
1976 else
1977 fn = hist_field_u64;
1978 break;
1979 case 4:
1980 if (field_is_signed)
1981 fn = hist_field_s32;
1982 else
1983 fn = hist_field_u32;
1984 break;
1985 case 2:
1986 if (field_is_signed)
1987 fn = hist_field_s16;
1988 else
1989 fn = hist_field_u16;
1990 break;
1991 case 1:
1992 if (field_is_signed)
1993 fn = hist_field_s8;
1994 else
1995 fn = hist_field_u8;
1996 break;
1997 }
1998
1999 return fn;
2000}
2001
2002static int parse_map_size(char *str)
2003{
2004 unsigned long size, map_bits;
2005 int ret;
2006
2007 strsep(&str, "=");
2008 if (!str) {
2009 ret = -EINVAL;
2010 goto out;
2011 }
2012
2013 ret = kstrtoul(str, 0, &size);
2014 if (ret)
2015 goto out;
2016
2017 map_bits = ilog2(roundup_pow_of_two(size));
2018 if (map_bits < TRACING_MAP_BITS_MIN ||
2019 map_bits > TRACING_MAP_BITS_MAX)
2020 ret = -EINVAL;
2021 else
2022 ret = map_bits;
2023 out:
2024 return ret;
2025}
2026
2027static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
2028{
30350d65
TZ		 2029 unsigned int i;
2030
7ef224d1
TZ		 2031 if (!attrs)
2032 return;
2033
30350d65
TZ		 2034 for (i = 0; i < attrs->n_assignments; i++)
2035 kfree(attrs->assignment_str[i]);
2036
0212e2aa
TZ		 2037 for (i = 0; i < attrs->n_actions; i++)
2038 kfree(attrs->action_str[i]);
2039
5463bfda 2040 kfree(attrs->name);
e62347d2 2041 kfree(attrs->sort_key_str);
7ef224d1 2042 kfree(attrs->keys_str);
f2606835 2043 kfree(attrs->vals_str);
a4072fe8 2044 kfree(attrs->clock);
7ef224d1
TZ		 2045 kfree(attrs);
2046}
2047
0212e2aa
TZ		 2048static int parse_action(char *str, struct hist_trigger_attrs *attrs)
2049{
c282a386 2050 int ret = -EINVAL;
0212e2aa
TZ		 2051
2052 if (attrs->n_actions >= HIST_ACTIONS_MAX)
2053 return ret;
2054
754481e6 2055 if ((str_has_prefix(str, "onmatch(")) ||
dff81f55
TZ		 2056 (str_has_prefix(str, "onmax(")) ||
2057 (str_has_prefix(str, "onchange("))) {
c282a386
TZ		 2058 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
2059 if (!attrs->action_str[attrs->n_actions]) {
2060 ret = -ENOMEM;
2061 return ret;
2062 }
2063 attrs->n_actions++;
2064 ret = 0;
2065 }
0212e2aa
TZ		 2066 return ret;
2067}
2068
d0cd871b
SRV		 2069static int parse_assignment(struct trace_array *tr,
2070 char *str, struct hist_trigger_attrs *attrs)
9b1ae035
TZ		 2071{
2072 int ret = 0;
2073
754481e6
SRV		 2074 if ((str_has_prefix(str, "key=")) ||
2075 (str_has_prefix(str, "keys="))) {
9b1ae035
TZ		 2076 attrs->keys_str = kstrdup(str, GFP_KERNEL);
2077 if (!attrs->keys_str) {
2078 ret = -ENOMEM;
2079 goto out;
2080 }
754481e6
SRV		 2081 } else if ((str_has_prefix(str, "val=")) ||
2082 (str_has_prefix(str, "vals=")) ||
2083 (str_has_prefix(str, "values="))) {
9b1ae035
TZ		 2084 attrs->vals_str = kstrdup(str, GFP_KERNEL);
2085 if (!attrs->vals_str) {
2086 ret = -ENOMEM;
2087 goto out;
2088 }
754481e6 2089 } else if (str_has_prefix(str, "sort=")) {
9b1ae035
TZ		 2090 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
2091 if (!attrs->sort_key_str) {
2092 ret = -ENOMEM;
2093 goto out;
2094 }
754481e6 2095 } else if (str_has_prefix(str, "name=")) {
9b1ae035
TZ		 2096 attrs->name = kstrdup(str, GFP_KERNEL);
2097 if (!attrs->name) {
2098 ret = -ENOMEM;
2099 goto out;
2100 }
754481e6 2101 } else if (str_has_prefix(str, "clock=")) {
a4072fe8
TZ		 2102 strsep(&str, "=");
2103 if (!str) {
2104 ret = -EINVAL;
2105 goto out;
2106 }
2107
2108 str = strstrip(str);
2109 attrs->clock = kstrdup(str, GFP_KERNEL);
2110 if (!attrs->clock) {
2111 ret = -ENOMEM;
2112 goto out;
2113 }
754481e6 2114 } else if (str_has_prefix(str, "size=")) {
9b1ae035
TZ		 2115 int map_bits = parse_map_size(str);
2116
2117 if (map_bits < 0) {
2118 ret = map_bits;
2119 goto out;
2120 }
2121 attrs->map_bits = map_bits;
30350d65
TZ		 2122 } else {
2123 char *assignment;
2124
2125 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
d0cd871b 2126 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
30350d65
TZ		 2127 ret = -EINVAL;
2128 goto out;
2129 }
2130
2131 assignment = kstrdup(str, GFP_KERNEL);
2132 if (!assignment) {
2133 ret = -ENOMEM;
2134 goto out;
2135 }
2136
2137 attrs->assignment_str[attrs->n_assignments++] = assignment;
2138 }
9b1ae035
TZ		 2139 out:
2140 return ret;
2141}
2142
d0cd871b
SRV		 2143static struct hist_trigger_attrs *
2144parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
7ef224d1
TZ		 2145{
2146 struct hist_trigger_attrs *attrs;
2147 int ret = 0;
2148
2149 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
2150 if (!attrs)
2151 return ERR_PTR(-ENOMEM);
2152
2153 while (trigger_str) {
2154 char *str = strsep(&trigger_str, ":");
2155
9b1ae035 2156 if (strchr(str, '=')) {
d0cd871b 2157 ret = parse_assignment(tr, str, attrs);
9b1ae035
TZ		 2158 if (ret)
2159 goto free;
2160 } else if (strcmp(str, "pause") == 0)
83e99914
TZ		 2161 attrs->pause = true;
2162 else if ((strcmp(str, "cont") == 0) ||
2163 (strcmp(str, "continue") == 0))
2164 attrs->cont = true;
e86ae9ba
TZ		 2165 else if (strcmp(str, "clear") == 0)
2166 attrs->clear = true;
9b1ae035 2167 else {
0212e2aa
TZ		 2168 ret = parse_action(str, attrs);
2169 if (ret)
2170 goto free;
7ef224d1
TZ		 2171 }
2172 }
2173
2174 if (!attrs->keys_str) {
2175 ret = -EINVAL;
2176 goto free;
2177 }
2178
a4072fe8
TZ		 2179 if (!attrs->clock) {
2180 attrs->clock = kstrdup("global", GFP_KERNEL);
2181 if (!attrs->clock) {
2182 ret = -ENOMEM;
2183 goto free;
2184 }
2185 }
2186
7ef224d1
TZ		 2187 return attrs;
2188 free:
2189 destroy_hist_trigger_attrs(attrs);
2190
2191 return ERR_PTR(ret);
2192}
2193
6b4827ad
TZ		 2194static inline void save_comm(char *comm, struct task_struct *task)
2195{
2196 if (!task->pid) {
2197 strcpy(comm, "<idle>");
2198 return;
2199 }
2200
2201 if (WARN_ON_ONCE(task->pid < 0)) {
2202 strcpy(comm, "<XXX>");
2203 return;
2204 }
2205
27242c62 2206 strncpy(comm, task->comm, TASK_COMM_LEN);
6b4827ad
TZ		 2207}
2208
af6a29bc
TZ		 2209static void hist_elt_data_free(struct hist_elt_data *elt_data)
2210{
02205a67
TZ		 2211 unsigned int i;
2212
2213 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
2214 kfree(elt_data->field_var_str[i]);
2215
af6a29bc
TZ		 2216 kfree(elt_data->comm);
2217 kfree(elt_data);
2218}
2219
2220static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
6b4827ad 2221{
af6a29bc
TZ		 2222 struct hist_elt_data *elt_data = elt->private_data;
2223
2224 hist_elt_data_free(elt_data);
6b4827ad
TZ		 2225}
2226
af6a29bc 2227static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
6b4827ad
TZ		 2228{
2229 struct hist_trigger_data *hist_data = elt->map->private_data;
af6a29bc
TZ		 2230 unsigned int size = TASK_COMM_LEN;
2231 struct hist_elt_data *elt_data;
6b4827ad 2232 struct hist_field *key_field;
02205a67 2233 unsigned int i, n_str;
6b4827ad 2234
af6a29bc
TZ		 2235 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
2236 if (!elt_data)
2237 return -ENOMEM;
2238
6b4827ad
TZ		 2239 for_each_hist_key_field(i, hist_data) {
2240 key_field = hist_data->fields[i];
2241
2242 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 2243 elt_data->comm = kzalloc(size, GFP_KERNEL);
2244 if (!elt_data->comm) {
2245 kfree(elt_data);
6b4827ad 2246 return -ENOMEM;
af6a29bc 2247 }
6b4827ad
TZ		 2248 break;
2249 }
2250 }
2251
7d18a10c 2252 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
02205a67
TZ		 2253
2254 size = STR_VAR_LEN_MAX;
2255
2256 for (i = 0; i < n_str; i++) {
2257 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
2258 if (!elt_data->field_var_str[i]) {
2259 hist_elt_data_free(elt_data);
2260 return -ENOMEM;
2261 }
2262 }
2263
af6a29bc
TZ		 2264 elt->private_data = elt_data;
2265
6b4827ad
TZ		 2266 return 0;
2267}
2268
af6a29bc 2269static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
6b4827ad 2270{
af6a29bc 2271 struct hist_elt_data *elt_data = elt->private_data;
6b4827ad 2272
af6a29bc
TZ		 2273 if (elt_data->comm)
2274 save_comm(elt_data->comm, current);
6b4827ad
TZ		 2275}
2276
af6a29bc
TZ		 2277static const struct tracing_map_ops hist_trigger_elt_data_ops = {
2278 .elt_alloc = hist_trigger_elt_data_alloc,
2279 .elt_free = hist_trigger_elt_data_free,
2280 .elt_init = hist_trigger_elt_data_init,
6b4827ad
TZ		 2281};
2282
2ece94fb
TZ		 2283static const char *get_hist_field_flags(struct hist_field *hist_field)
2284{
2285 const char *flags_str = NULL;
2286
2287 if (hist_field->flags & HIST_FIELD_FL_HEX)
2288 flags_str = "hex";
2289 else if (hist_field->flags & HIST_FIELD_FL_SYM)
2290 flags_str = "sym";
2291 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
2292 flags_str = "sym-offset";
2293 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
2294 flags_str = "execname";
2295 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
2296 flags_str = "syscall";
2297 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
2298 flags_str = "log2";
2299 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2300 flags_str = "usecs";
2301
2302 return flags_str;
2303}
2304
100719dc
TZ		 2305static void expr_field_str(struct hist_field *field, char *expr)
2306{
067fe038
TZ		 2307 if (field->flags & HIST_FIELD_FL_VAR_REF)
2308 strcat(expr, "$");
2309
100719dc
TZ		 2310 strcat(expr, hist_field_name(field, 0));
2311
76690945 2312 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
100719dc
TZ		 2313 const char *flags_str = get_hist_field_flags(field);
2314
2315 if (flags_str) {
2316 strcat(expr, ".");
2317 strcat(expr, flags_str);
2318 }
2319 }
2320}
2321
2322static char *expr_str(struct hist_field *field, unsigned int level)
2323{
2324 char *expr;
2325
2326 if (level > 1)
2327 return NULL;
2328
2329 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2330 if (!expr)
2331 return NULL;
2332
2333 if (!field->operands[0]) {
2334 expr_field_str(field, expr);
2335 return expr;
2336 }
2337
2338 if (field->operator == FIELD_OP_UNARY_MINUS) {
2339 char *subexpr;
2340
2341 strcat(expr, "-(");
2342 subexpr = expr_str(field->operands[0], ++level);
2343 if (!subexpr) {
2344 kfree(expr);
2345 return NULL;
2346 }
2347 strcat(expr, subexpr);
2348 strcat(expr, ")");
2349
2350 kfree(subexpr);
2351
2352 return expr;
2353 }
2354
2355 expr_field_str(field->operands[0], expr);
2356
2357 switch (field->operator) {
2358 case FIELD_OP_MINUS:
2359 strcat(expr, "-");
2360 break;
2361 case FIELD_OP_PLUS:
2362 strcat(expr, "+");
2363 break;
2364 default:
2365 kfree(expr);
2366 return NULL;
2367 }
2368
2369 expr_field_str(field->operands[1], expr);
2370
2371 return expr;
2372}
2373
2374static int contains_operator(char *str)
2375{
2376 enum field_op_id field_op = FIELD_OP_NONE;
2377 char *op;
2378
2379 op = strpbrk(str, "+-");
2380 if (!op)
2381 return FIELD_OP_NONE;
2382
2383 switch (*op) {
2384 case '-':
2385 if (*str == '-')
2386 field_op = FIELD_OP_UNARY_MINUS;
2387 else
2388 field_op = FIELD_OP_MINUS;
2389 break;
2390 case '+':
2391 field_op = FIELD_OP_PLUS;
2392 break;
2393 default:
2394 break;
2395 }
2396
2397 return field_op;
2398}
2399
656fe2ba
TZ		 2400static void __destroy_hist_field(struct hist_field *hist_field)
2401{
2402 kfree(hist_field->var.name);
2403 kfree(hist_field->name);
2404 kfree(hist_field->type);
2405
2406 kfree(hist_field);
2407}
2408
5819eadd
TZ		 2409static void destroy_hist_field(struct hist_field *hist_field,
2410 unsigned int level)
7ef224d1 2411{
5819eadd
TZ		 2412 unsigned int i;
2413
100719dc 2414 if (level > 3)
5819eadd
TZ		 2415 return;
2416
2417 if (!hist_field)
2418 return;
2419
656fe2ba
TZ		 2420 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
2421 return; /* var refs will be destroyed separately */
2422
5819eadd
TZ		 2423 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
2424 destroy_hist_field(hist_field->operands[i], level + 1);
2425
656fe2ba 2426 __destroy_hist_field(hist_field);
7ef224d1
TZ		 2427}
2428
b559d003
TZ		 2429static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
2430 struct ftrace_event_field *field,
30350d65
TZ		 2431 unsigned long flags,
2432 char *var_name)
7ef224d1
TZ		 2433{
2434 struct hist_field *hist_field;
2435
2436 if (field && is_function_field(field))
2437 return NULL;
2438
2439 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2440 if (!hist_field)
2441 return NULL;
2442
b559d003
TZ		 2443 hist_field->hist_data = hist_data;
2444
7e8b88a3 2445 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
100719dc
TZ		 2446 goto out; /* caller will populate */
2447
067fe038
TZ		 2448 if (flags & HIST_FIELD_FL_VAR_REF) {
2449 hist_field->fn = hist_field_var_ref;
2450 goto out;
2451 }
2452
7ef224d1
TZ		 2453 if (flags & HIST_FIELD_FL_HITCOUNT) {
2454 hist_field->fn = hist_field_counter;
19a9facd
TZ		 2455 hist_field->size = sizeof(u64);
2456 hist_field->type = kstrdup("u64", GFP_KERNEL);
2457 if (!hist_field->type)
2458 goto free;
7ef224d1
TZ		 2459 goto out;
2460 }
2461
69a0200c
TZ		 2462 if (flags & HIST_FIELD_FL_STACKTRACE) {
2463 hist_field->fn = hist_field_none;
2464 goto out;
2465 }
2466
4b94f5b7 2467 if (flags & HIST_FIELD_FL_LOG2) {
5819eadd 2468 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
4b94f5b7 2469 hist_field->fn = hist_field_log2;
30350d65 2470 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
5819eadd 2471 hist_field->size = hist_field->operands[0]->size;
19a9facd
TZ		 2472 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
2473 if (!hist_field->type)
2474 goto free;
4b94f5b7
NK		 2475 goto out;
2476 }
2477
ad42febe
TZ		 2478 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2479 hist_field->fn = hist_field_timestamp;
2480 hist_field->size = sizeof(u64);
19a9facd
TZ		 2481 hist_field->type = kstrdup("u64", GFP_KERNEL);
2482 if (!hist_field->type)
2483 goto free;
ad42febe
TZ		 2484 goto out;
2485 }
2486
8b7622bf
TZ		 2487 if (flags & HIST_FIELD_FL_CPU) {
2488 hist_field->fn = hist_field_cpu;
2489 hist_field->size = sizeof(int);
2490 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
2491 if (!hist_field->type)
2492 goto free;
2493 goto out;
2494 }
2495
432480c5
TZ		 2496 if (WARN_ON_ONCE(!field))
2497 goto out;
2498
7ef224d1
TZ		 2499 if (is_string_field(field)) {
2500 flags |= HIST_FIELD_FL_STRING;
79e577cb 2501
19a9facd
TZ		 2502 hist_field->size = MAX_FILTER_STR_VAL;
2503 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2504 if (!hist_field->type)
2505 goto free;
2506
79e577cb
NK		 2507 if (field->filter_type == FILTER_STATIC_STRING)
2508 hist_field->fn = hist_field_string;
2509 else if (field->filter_type == FILTER_DYN_STRING)
2510 hist_field->fn = hist_field_dynstring;
2511 else
2512 hist_field->fn = hist_field_pstring;
7ef224d1 2513 } else {
19a9facd
TZ		 2514 hist_field->size = field->size;
2515 hist_field->is_signed = field->is_signed;
2516 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2517 if (!hist_field->type)
2518 goto free;
2519
7ef224d1
TZ		 2520 hist_field->fn = select_value_fn(field->size,
2521 field->is_signed);
2522 if (!hist_field->fn) {
5819eadd 2523 destroy_hist_field(hist_field, 0);
7ef224d1
TZ		 2524 return NULL;
2525 }
2526 }
2527 out:
2528 hist_field->field = field;
2529 hist_field->flags = flags;
2530
30350d65
TZ		 2531 if (var_name) {
2532 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2533 if (!hist_field->var.name)
2534 goto free;
2535 }
2536
7ef224d1 2537 return hist_field;
30350d65
TZ		 2538 free:
2539 destroy_hist_field(hist_field, 0);
2540 return NULL;
7ef224d1
TZ		 2541}
2542
2543static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2544{
2545 unsigned int i;
2546
30350d65 2547 for (i = 0; i < HIST_FIELDS_MAX; i++) {
7ef224d1 2548 if (hist_data->fields[i]) {
5819eadd 2549 destroy_hist_field(hist_data->fields[i], 0);
7ef224d1
TZ		 2550 hist_data->fields[i] = NULL;
2551 }
2552 }
656fe2ba
TZ		 2553
2554 for (i = 0; i < hist_data->n_var_refs; i++) {
2555 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2556 __destroy_hist_field(hist_data->var_refs[i]);
2557 hist_data->var_refs[i] = NULL;
2558 }
7ef224d1
TZ		 2559}
2560
067fe038
TZ		 2561static int init_var_ref(struct hist_field *ref_field,
2562 struct hist_field *var_field,
2563 char *system, char *event_name)
2564{
2565 int err = 0;
2566
2567 ref_field->var.idx = var_field->var.idx;
2568 ref_field->var.hist_data = var_field->hist_data;
2569 ref_field->size = var_field->size;
2570 ref_field->is_signed = var_field->is_signed;
2571 ref_field->flags |= var_field->flags &
2572 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2573
2574 if (system) {
2575 ref_field->system = kstrdup(system, GFP_KERNEL);
2576 if (!ref_field->system)
2577 return -ENOMEM;
2578 }
2579
2580 if (event_name) {
2581 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2582 if (!ref_field->event_name) {
2583 err = -ENOMEM;
2584 goto free;
2585 }
2586 }
2587
7e8b88a3
TZ		 2588 if (var_field->var.name) {
2589 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2590 if (!ref_field->name) {
2591 err = -ENOMEM;
2592 goto free;
2593 }
2594 } else if (var_field->name) {
2595 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2596 if (!ref_field->name) {
2597 err = -ENOMEM;
2598 goto free;
2599 }
067fe038
TZ		 2600 }
2601
2602 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
2603 if (!ref_field->type) {
2604 err = -ENOMEM;
2605 goto free;
2606 }
2607 out:
2608 return err;
2609 free:
2610 kfree(ref_field->system);
2611 kfree(ref_field->event_name);
2612 kfree(ref_field->name);
2613
2614 goto out;
2615}
2616
de40f033
TZ		 2617/**
2618 * create_var_ref - Create a variable reference and attach it to trigger
2619 * @hist_data: The trigger that will be referencing the variable
2620 * @var_field: The VAR field to create a reference to
2621 * @system: The optional system string
2622 * @event_name: The optional event_name string
2623 *
2624 * Given a variable hist_field, create a VAR_REF hist_field that
2625 * represents a reference to it.
2626 *
2627 * This function also adds the reference to the trigger that
2628 * now references the variable.
2629 *
2630 * Return: The VAR_REF field if successful, NULL if not
2631 */
2632static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2633 struct hist_field *var_field,
067fe038
TZ		 2634 char *system, char *event_name)
2635{
2636 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2637 struct hist_field *ref_field;
2638
2639 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2640 if (ref_field) {
2641 if (init_var_ref(ref_field, var_field, system, event_name)) {
2642 destroy_hist_field(ref_field, 0);
2643 return NULL;
2644 }
de40f033
TZ		 2645
2646 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2647 ref_field->var_ref_idx = hist_data->n_var_refs++;
067fe038
TZ		 2648 }
2649
2650 return ref_field;
2651}
2652
2653static bool is_var_ref(char *var_name)
2654{
2655 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2656 return false;
2657
2658 return true;
2659}
2660
2661static char *field_name_from_var(struct hist_trigger_data *hist_data,
2662 char *var_name)
2663{
2664 char *name, *field;
2665 unsigned int i;
2666
2667 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2668 name = hist_data->attrs->var_defs.name[i];
2669
2670 if (strcmp(var_name, name) == 0) {
2671 field = hist_data->attrs->var_defs.expr[i];
2672 if (contains_operator(field) || is_var_ref(field))
2673 continue;
2674 return field;
2675 }
2676 }
2677
2678 return NULL;
2679}
2680
2681static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2682 char *system, char *event_name,
2683 char *var_name)
2684{
2685 struct trace_event_call *call;
2686
2687 if (system && event_name) {
2688 call = hist_data->event_file->event_call;
2689
2690 if (strcmp(system, call->class->system) != 0)
2691 return NULL;
2692
2693 if (strcmp(event_name, trace_event_name(call)) != 0)
2694 return NULL;
2695 }
2696
2697 if (!!system != !!event_name)
2698 return NULL;
2699
2700 if (!is_var_ref(var_name))
2701 return NULL;
2702
2703 var_name++;
2704
2705 return field_name_from_var(hist_data, var_name);
2706}
2707
2708static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2709 char *system, char *event_name,
2710 char *var_name)
2711{
2712 struct hist_field *var_field = NULL, *ref_field = NULL;
d0cd871b 2713 struct trace_array *tr = hist_data->event_file->tr;
067fe038
TZ		 2714
2715 if (!is_var_ref(var_name))
2716 return NULL;
2717
2718 var_name++;
2719
2720 var_field = find_event_var(hist_data, system, event_name, var_name);
2721 if (var_field)
de40f033
TZ		 2722 ref_field = create_var_ref(hist_data, var_field,
2723 system, event_name);
067fe038 2724
f404da6e 2725 if (!ref_field)
d0cd871b 2726 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
f404da6e 2727
067fe038
TZ		 2728 return ref_field;
2729}
2730
100719dc
TZ		 2731static struct ftrace_event_field *
2732parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2733 char *field_str, unsigned long *flags)
2734{
2735 struct ftrace_event_field *field = NULL;
2736 char *field_name, *modifier, *str;
d0cd871b 2737 struct trace_array *tr = file->tr;
100719dc
TZ		 2738
2739 modifier = str = kstrdup(field_str, GFP_KERNEL);
2740 if (!modifier)
2741 return ERR_PTR(-ENOMEM);
2742
2743 field_name = strsep(&modifier, ".");
2744 if (modifier) {
2745 if (strcmp(modifier, "hex") == 0)
2746 *flags |= HIST_FIELD_FL_HEX;
2747 else if (strcmp(modifier, "sym") == 0)
2748 *flags |= HIST_FIELD_FL_SYM;
2749 else if (strcmp(modifier, "sym-offset") == 0)
2750 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2751 else if ((strcmp(modifier, "execname") == 0) &&
2752 (strcmp(field_name, "common_pid") == 0))
2753 *flags |= HIST_FIELD_FL_EXECNAME;
2754 else if (strcmp(modifier, "syscall") == 0)
2755 *flags |= HIST_FIELD_FL_SYSCALL;
2756 else if (strcmp(modifier, "log2") == 0)
2757 *flags |= HIST_FIELD_FL_LOG2;
2758 else if (strcmp(modifier, "usecs") == 0)
2759 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2760 else {
d0cd871b 2761 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
100719dc
TZ		 2762 field = ERR_PTR(-EINVAL);
2763 goto out;
2764 }
2765 }
2766
2767 if (strcmp(field_name, "common_timestamp") == 0) {
2768 *flags |= HIST_FIELD_FL_TIMESTAMP;
2769 hist_data->enable_timestamps = true;
2770 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2771 hist_data->attrs->ts_in_usecs = true;
8b7622bf
TZ		 2772 } else if (strcmp(field_name, "cpu") == 0)
2773 *flags |= HIST_FIELD_FL_CPU;
2774 else {
100719dc
TZ		 2775 field = trace_find_event_field(file->event_call, field_name);
2776 if (!field || !field->size) {
d0cd871b 2777 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
100719dc
TZ		 2778 field = ERR_PTR(-EINVAL);
2779 goto out;
2780 }
2781 }
2782 out:
2783 kfree(str);
2784
2785 return field;
2786}
2787
7e8b88a3
TZ		 2788static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2789 struct hist_field *var_ref,
2790 char *var_name)
2791{
2792 struct hist_field *alias = NULL;
2793 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2794
2795 alias = create_hist_field(hist_data, NULL, flags, var_name);
2796 if (!alias)
2797 return NULL;
2798
2799 alias->fn = var_ref->fn;
2800 alias->operands[0] = var_ref;
2801
2802 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2803 destroy_hist_field(alias, 0);
2804 return NULL;
2805 }
2806
17f8607a
TZ		 2807 alias->var_ref_idx = var_ref->var_ref_idx;
2808
7e8b88a3
TZ		 2809 return alias;
2810}
2811
100719dc
TZ		 2812static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2813 struct trace_event_file *file, char *str,
2814 unsigned long *flags, char *var_name)
2815{
067fe038 2816 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
100719dc
TZ		 2817 struct ftrace_event_field *field = NULL;
2818 struct hist_field *hist_field = NULL;
2819 int ret = 0;
2820
067fe038
TZ		 2821 s = strchr(str, '.');
2822 if (s) {
2823 s = strchr(++s, '.');
2824 if (s) {
2825 ref_system = strsep(&str, ".");
2826 if (!str) {
2827 ret = -EINVAL;
2828 goto out;
2829 }
2830 ref_event = strsep(&str, ".");
2831 if (!str) {
2832 ret = -EINVAL;
2833 goto out;
2834 }
2835 ref_var = str;
2836 }
2837 }
2838
2839 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2840 if (!s) {
d0cd871b
SRV		 2841 hist_field = parse_var_ref(hist_data, ref_system,
2842 ref_event, ref_var);
067fe038 2843 if (hist_field) {
7e8b88a3
TZ		 2844 if (var_name) {
2845 hist_field = create_alias(hist_data, hist_field, var_name);
2846 if (!hist_field) {
2847 ret = -ENOMEM;
2848 goto out;
2849 }
2850 }
067fe038
TZ		 2851 return hist_field;
2852 }
2853 } else
2854 str = s;
2855
100719dc
TZ		 2856 field = parse_field(hist_data, file, str, flags);
2857 if (IS_ERR(field)) {
2858 ret = PTR_ERR(field);
2859 goto out;
2860 }
2861
2862 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2863 if (!hist_field) {
2864 ret = -ENOMEM;
2865 goto out;
2866 }
2867
2868 return hist_field;
2869 out:
2870 return ERR_PTR(ret);
2871}
2872
2873static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2874 struct trace_event_file *file,
2875 char *str, unsigned long flags,
2876 char *var_name, unsigned int level);
2877
2878static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2879 struct trace_event_file *file,
2880 char *str, unsigned long flags,
2881 char *var_name, unsigned int level)
2882{
2883 struct hist_field *operand1, *expr = NULL;
2884 unsigned long operand_flags;
2885 int ret = 0;
2886 char *s;
2887
2888 /* we support only -(xxx) i.e. explicit parens required */
2889
2890 if (level > 3) {
d0cd871b 2891 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc
TZ		 2892 ret = -EINVAL;
2893 goto free;
2894 }
2895
2896 str++; /* skip leading '-' */
2897
2898 s = strchr(str, '(');
2899 if (s)
2900 str++;
2901 else {
2902 ret = -EINVAL;
2903 goto free;
2904 }
2905
2906 s = strrchr(str, ')');
2907 if (s)
2908 *s = '\0';
2909 else {
2910 ret = -EINVAL; /* no closing ')' */
2911 goto free;
2912 }
2913
2914 flags |= HIST_FIELD_FL_EXPR;
2915 expr = create_hist_field(hist_data, NULL, flags, var_name);
2916 if (!expr) {
2917 ret = -ENOMEM;
2918 goto free;
2919 }
2920
2921 operand_flags = 0;
2922 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2923 if (IS_ERR(operand1)) {
2924 ret = PTR_ERR(operand1);
2925 goto free;
2926 }
2927
2928 expr->flags |= operand1->flags &
2929 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2930 expr->fn = hist_field_unary_minus;
2931 expr->operands[0] = operand1;
2932 expr->operator = FIELD_OP_UNARY_MINUS;
2933 expr->name = expr_str(expr, 0);
19a9facd
TZ		 2934 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2935 if (!expr->type) {
2936 ret = -ENOMEM;
2937 goto free;
2938 }
100719dc
TZ		 2939
2940 return expr;
2941 free:
2942 destroy_hist_field(expr, 0);
2943 return ERR_PTR(ret);
2944}
2945
d0cd871b
SRV		 2946static int check_expr_operands(struct trace_array *tr,
2947 struct hist_field *operand1,
100719dc
TZ		 2948 struct hist_field *operand2)
2949{
2950 unsigned long operand1_flags = operand1->flags;
2951 unsigned long operand2_flags = operand2->flags;
2952
7e8b88a3
TZ		 2953 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2954 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2955 struct hist_field *var;
2956
2957 var = find_var_field(operand1->var.hist_data, operand1->name);
2958 if (!var)
2959 return -EINVAL;
2960 operand1_flags = var->flags;
2961 }
2962
2963 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2964 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2965 struct hist_field *var;
2966
2967 var = find_var_field(operand2->var.hist_data, operand2->name);
2968 if (!var)
2969 return -EINVAL;
2970 operand2_flags = var->flags;
2971 }
2972
100719dc 2973 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
f404da6e 2974 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
d0cd871b 2975 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
100719dc 2976 return -EINVAL;
f404da6e 2977 }
100719dc
TZ		 2978
2979 return 0;
2980}
2981
2982static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2983 struct trace_event_file *file,
2984 char *str, unsigned long flags,
2985 char *var_name, unsigned int level)
2986{
2987 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2988 unsigned long operand_flags;
2989 int field_op, ret = -EINVAL;
2990 char *sep, *operand1_str;
2991
f404da6e 2992 if (level > 3) {
d0cd871b 2993 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc 2994 return ERR_PTR(-EINVAL);
f404da6e 2995 }
100719dc
TZ		 2996
2997 field_op = contains_operator(str);
2998
2999 if (field_op == FIELD_OP_NONE)
3000 return parse_atom(hist_data, file, str, &flags, var_name);
3001
3002 if (field_op == FIELD_OP_UNARY_MINUS)
3003 return parse_unary(hist_data, file, str, flags, var_name, ++level);
3004
3005 switch (field_op) {
3006 case FIELD_OP_MINUS:
3007 sep = "-";
3008 break;
3009 case FIELD_OP_PLUS:
3010 sep = "+";
3011 break;
3012 default:
3013 goto free;
3014 }
3015
3016 operand1_str = strsep(&str, sep);
3017 if (!operand1_str || !str)
3018 goto free;
3019
3020 operand_flags = 0;
3021 operand1 = parse_atom(hist_data, file, operand1_str,
3022 &operand_flags, NULL);
3023 if (IS_ERR(operand1)) {
3024 ret = PTR_ERR(operand1);
3025 operand1 = NULL;
3026 goto free;
3027 }
3028
3029 /* rest of string could be another expression e.g. b+c in a+b+c */
3030 operand_flags = 0;
3031 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
3032 if (IS_ERR(operand2)) {
3033 ret = PTR_ERR(operand2);
3034 operand2 = NULL;
3035 goto free;
3036 }
3037
d0cd871b 3038 ret = check_expr_operands(file->tr, operand1, operand2);
100719dc
TZ		 3039 if (ret)
3040 goto free;
3041
3042 flags |= HIST_FIELD_FL_EXPR;
3043
3044 flags |= operand1->flags &
3045 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
3046
3047 expr = create_hist_field(hist_data, NULL, flags, var_name);
3048 if (!expr) {
3049 ret = -ENOMEM;
3050 goto free;
3051 }
3052
067fe038
TZ		 3053 operand1->read_once = true;
3054 operand2->read_once = true;
3055
100719dc
TZ		 3056 expr->operands[0] = operand1;
3057 expr->operands[1] = operand2;
3058 expr->operator = field_op;
3059 expr->name = expr_str(expr, 0);
19a9facd
TZ		 3060 expr->type = kstrdup(operand1->type, GFP_KERNEL);
3061 if (!expr->type) {
3062 ret = -ENOMEM;
3063 goto free;
3064 }
100719dc
TZ		 3065
3066 switch (field_op) {
3067 case FIELD_OP_MINUS:
3068 expr->fn = hist_field_minus;
3069 break;
3070 case FIELD_OP_PLUS:
3071 expr->fn = hist_field_plus;
3072 break;
3073 default:
5e4cf2bf 3074 ret = -EINVAL;
100719dc
TZ		 3075 goto free;
3076 }
3077
3078 return expr;
3079 free:
3080 destroy_hist_field(operand1, 0);
3081 destroy_hist_field(operand2, 0);
3082 destroy_hist_field(expr, 0);
3083
3084 return ERR_PTR(ret);
3085}
3086
02205a67
TZ		 3087static char *find_trigger_filter(struct hist_trigger_data *hist_data,
3088 struct trace_event_file *file)
3089{
3090 struct event_trigger_data *test;
3091
3092 list_for_each_entry_rcu(test, &file->triggers, list) {
3093 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3094 if (test->private_data == hist_data)
3095 return test->filter_str;
3096 }
3097 }
3098
3099 return NULL;
3100}
3101
3102static struct event_command trigger_hist_cmd;
3103static int event_hist_trigger_func(struct event_command *cmd_ops,
3104 struct trace_event_file *file,
3105 char *glob, char *cmd, char *param);
3106
3107static bool compatible_keys(struct hist_trigger_data *target_hist_data,
3108 struct hist_trigger_data *hist_data,
3109 unsigned int n_keys)
3110{
3111 struct hist_field *target_hist_field, *hist_field;
3112 unsigned int n, i, j;
3113
3114 if (hist_data->n_fields - hist_data->n_vals != n_keys)
3115 return false;
3116
3117 i = hist_data->n_vals;
3118 j = target_hist_data->n_vals;
3119
3120 for (n = 0; n < n_keys; n++) {
3121 hist_field = hist_data->fields[i + n];
3122 target_hist_field = target_hist_data->fields[j + n];
3123
3124 if (strcmp(hist_field->type, target_hist_field->type) != 0)
3125 return false;
3126 if (hist_field->size != target_hist_field->size)
3127 return false;
3128 if (hist_field->is_signed != target_hist_field->is_signed)
3129 return false;
3130 }
3131
3132 return true;
3133}
3134
3135static struct hist_trigger_data *
3136find_compatible_hist(struct hist_trigger_data *target_hist_data,
3137 struct trace_event_file *file)
3138{
3139 struct hist_trigger_data *hist_data;
3140 struct event_trigger_data *test;
3141 unsigned int n_keys;
3142
3143 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
3144
3145 list_for_each_entry_rcu(test, &file->triggers, list) {
3146 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3147 hist_data = test->private_data;
3148
3149 if (compatible_keys(target_hist_data, hist_data, n_keys))
3150 return hist_data;
3151 }
3152 }
3153
3154 return NULL;
3155}
3156
3157static struct trace_event_file *event_file(struct trace_array *tr,
3158 char *system, char *event_name)
3159{
3160 struct trace_event_file *file;
3161
3be4c1e5 3162 file = __find_event_file(tr, system, event_name);
02205a67
TZ		 3163 if (!file)
3164 return ERR_PTR(-EINVAL);
3165
3166 return file;
3167}
3168
3169static struct hist_field *
3170find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
3171 char *system, char *event_name, char *field_name)
3172{
3173 struct hist_field *event_var;
3174 char *synthetic_name;
3175
3176 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3177 if (!synthetic_name)
3178 return ERR_PTR(-ENOMEM);
3179
3180 strcpy(synthetic_name, "synthetic_");
3181 strcat(synthetic_name, field_name);
3182
3183 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
3184
3185 kfree(synthetic_name);
3186
3187 return event_var;
3188}
3189
3190/**
3191 * create_field_var_hist - Automatically create a histogram and var for a field
3192 * @target_hist_data: The target hist trigger
3193 * @subsys_name: Optional subsystem name
3194 * @event_name: Optional event name
3195 * @field_name: The name of the field (and the resulting variable)
3196 *
3197 * Hist trigger actions fetch data from variables, not directly from
3198 * events. However, for convenience, users are allowed to directly
3199 * specify an event field in an action, which will be automatically
3200 * converted into a variable on their behalf.
3201
3202 * If a user specifies a field on an event that isn't the event the
3203 * histogram currently being defined (the target event histogram), the
3204 * only way that can be accomplished is if a new hist trigger is
3205 * created and the field variable defined on that.
3206 *
3207 * This function creates a new histogram compatible with the target
3208 * event (meaning a histogram with the same key as the target
3209 * histogram), and creates a variable for the specified field, but
3210 * with 'synthetic_' prepended to the variable name in order to avoid
3211 * collision with normal field variables.
3212 *
3213 * Return: The variable created for the field.
3214 */
c282a386 3215static struct hist_field *
02205a67
TZ		 3216create_field_var_hist(struct hist_trigger_data *target_hist_data,
3217 char *subsys_name, char *event_name, char *field_name)
3218{
3219 struct trace_array *tr = target_hist_data->event_file->tr;
3220 struct hist_field *event_var = ERR_PTR(-EINVAL);
3221 struct hist_trigger_data *hist_data;
3222 unsigned int i, n, first = true;
3223 struct field_var_hist *var_hist;
3224 struct trace_event_file *file;
3225 struct hist_field *key_field;
3226 char *saved_filter;
3227 char *cmd;
3228 int ret;
3229
f404da6e 3230 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
d0cd871b 3231 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67 3232 return ERR_PTR(-EINVAL);
f404da6e 3233 }
02205a67
TZ		 3234
3235 file = event_file(tr, subsys_name, event_name);
3236
3237 if (IS_ERR(file)) {
d0cd871b 3238 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
02205a67
TZ		 3239 ret = PTR_ERR(file);
3240 return ERR_PTR(ret);
3241 }
3242
3243 /*
3244 * Look for a histogram compatible with target. We'll use the
3245 * found histogram specification to create a new matching
3246 * histogram with our variable on it. target_hist_data is not
3247 * yet a registered histogram so we can't use that.
3248 */
3249 hist_data = find_compatible_hist(target_hist_data, file);
f404da6e 3250 if (!hist_data) {
d0cd871b 3251 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
02205a67 3252 return ERR_PTR(-EINVAL);
f404da6e 3253 }
02205a67
TZ		 3254
3255 /* See if a synthetic field variable has already been created */
3256 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3257 event_name, field_name);
3258 if (!IS_ERR_OR_NULL(event_var))
3259 return event_var;
3260
3261 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3262 if (!var_hist)
3263 return ERR_PTR(-ENOMEM);
3264
3265 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3266 if (!cmd) {
3267 kfree(var_hist);
3268 return ERR_PTR(-ENOMEM);
3269 }
3270
3271 /* Use the same keys as the compatible histogram */
3272 strcat(cmd, "keys=");
3273
3274 for_each_hist_key_field(i, hist_data) {
3275 key_field = hist_data->fields[i];
3276 if (!first)
3277 strcat(cmd, ",");
3278 strcat(cmd, key_field->field->name);
3279 first = false;
3280 }
3281
3282 /* Create the synthetic field variable specification */
3283 strcat(cmd, ":synthetic_");
3284 strcat(cmd, field_name);
3285 strcat(cmd, "=");
3286 strcat(cmd, field_name);
3287
3288 /* Use the same filter as the compatible histogram */
3289 saved_filter = find_trigger_filter(hist_data, file);
3290 if (saved_filter) {
3291 strcat(cmd, " if ");
3292 strcat(cmd, saved_filter);
3293 }
3294
3295 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3296 if (!var_hist->cmd) {
3297 kfree(cmd);
3298 kfree(var_hist);
3299 return ERR_PTR(-ENOMEM);
3300 }
3301
3302 /* Save the compatible histogram information */
3303 var_hist->hist_data = hist_data;
3304
3305 /* Create the new histogram with our variable */
3306 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
3307 "", "hist", cmd);
3308 if (ret) {
3309 kfree(cmd);
3310 kfree(var_hist->cmd);
3311 kfree(var_hist);
d0cd871b 3312 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
02205a67
TZ		 3313 return ERR_PTR(ret);
3314 }
3315
3316 kfree(cmd);
3317
3318 /* If we can't find the variable, something went wrong */
3319 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3320 event_name, field_name);
3321 if (IS_ERR_OR_NULL(event_var)) {
3322 kfree(var_hist->cmd);
3323 kfree(var_hist);
d0cd871b 3324 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
02205a67
TZ		 3325 return ERR_PTR(-EINVAL);
3326 }
3327
3328 n = target_hist_data->n_field_var_hists;
3329 target_hist_data->field_var_hists[n] = var_hist;
3330 target_hist_data->n_field_var_hists++;
3331
3332 return event_var;
3333}
3334
c282a386 3335static struct hist_field *
02205a67
TZ		 3336find_target_event_var(struct hist_trigger_data *hist_data,
3337 char *subsys_name, char *event_name, char *var_name)
3338{
3339 struct trace_event_file *file = hist_data->event_file;
3340 struct hist_field *hist_field = NULL;
3341
3342 if (subsys_name) {
3343 struct trace_event_call *call;
3344
3345 if (!event_name)
3346 return NULL;
3347
3348 call = file->event_call;
3349
3350 if (strcmp(subsys_name, call->class->system) != 0)
3351 return NULL;
3352
3353 if (strcmp(event_name, trace_event_name(call)) != 0)
3354 return NULL;
3355 }
3356
3357 hist_field = find_var_field(hist_data, var_name);
3358
3359 return hist_field;
3360}
3361
3362static inline void __update_field_vars(struct tracing_map_elt *elt,
3363 struct ring_buffer_event *rbe,
3364 void *rec,
3365 struct field_var **field_vars,
3366 unsigned int n_field_vars,
3367 unsigned int field_var_str_start)
3368{
3369 struct hist_elt_data *elt_data = elt->private_data;
3370 unsigned int i, j, var_idx;
3371 u64 var_val;
3372
3373 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3374 struct field_var *field_var = field_vars[i];
3375 struct hist_field *var = field_var->var;
3376 struct hist_field *val = field_var->val;
3377
3378 var_val = val->fn(val, elt, rbe, rec);
3379 var_idx = var->var.idx;
3380
3381 if (val->flags & HIST_FIELD_FL_STRING) {
3382 char *str = elt_data->field_var_str[j++];
3383 char *val_str = (char *)(uintptr_t)var_val;
3384
ad452870 3385 strscpy(str, val_str, STR_VAR_LEN_MAX);
02205a67
TZ		 3386 var_val = (u64)(uintptr_t)str;
3387 }
3388 tracing_map_set_var(elt, var_idx, var_val);
3389 }
3390}
3391
3392static void update_field_vars(struct hist_trigger_data *hist_data,
3393 struct tracing_map_elt *elt,
3394 struct ring_buffer_event *rbe,
3395 void *rec)
3396{
3397 __update_field_vars(elt, rbe, rec, hist_data->field_vars,
3398 hist_data->n_field_vars, 0);
3399}
3400
466f4528
TZ		 3401static void save_track_data_vars(struct hist_trigger_data *hist_data,
3402 struct tracing_map_elt *elt, void *rec,
3403 struct ring_buffer_event *rbe, void *key,
3404 struct action_data *data, u64 *var_ref_vals)
50450603 3405{
7d18a10c
TZ		 3406 __update_field_vars(elt, rbe, rec, hist_data->save_vars,
3407 hist_data->n_save_vars, hist_data->n_field_var_str);
50450603
TZ		 3408}
3409
02205a67
TZ		 3410static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3411 struct trace_event_file *file,
3412 char *name, int size, const char *type)
3413{
3414 struct hist_field *var;
3415 int idx;
3416
3417 if (find_var(hist_data, file, name) && !hist_data->remove) {
3418 var = ERR_PTR(-EINVAL);
3419 goto out;
3420 }
3421
3422 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3423 if (!var) {
3424 var = ERR_PTR(-ENOMEM);
3425 goto out;
3426 }
3427
3428 idx = tracing_map_add_var(hist_data->map);
3429 if (idx < 0) {
3430 kfree(var);
3431 var = ERR_PTR(-EINVAL);
3432 goto out;
3433 }
3434
3435 var->flags = HIST_FIELD_FL_VAR;
3436 var->var.idx = idx;
3437 var->var.hist_data = var->hist_data = hist_data;
3438 var->size = size;
3439 var->var.name = kstrdup(name, GFP_KERNEL);
3440 var->type = kstrdup(type, GFP_KERNEL);
3441 if (!var->var.name || !var->type) {
3442 kfree(var->var.name);
3443 kfree(var->type);
3444 kfree(var);
3445 var = ERR_PTR(-ENOMEM);
3446 }
3447 out:
3448 return var;
3449}
3450
3451static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3452 struct trace_event_file *file,
3453 char *field_name)
3454{
3455 struct hist_field *val = NULL, *var = NULL;
3456 unsigned long flags = HIST_FIELD_FL_VAR;
d0cd871b 3457 struct trace_array *tr = file->tr;
02205a67
TZ		 3458 struct field_var *field_var;
3459 int ret = 0;
3460
3461 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
d0cd871b 3462 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67
TZ		 3463 ret = -EINVAL;
3464 goto err;
3465 }
3466
3467 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3468 if (IS_ERR(val)) {
d0cd871b 3469 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
02205a67
TZ		 3470 ret = PTR_ERR(val);
3471 goto err;
3472 }
3473
3474 var = create_var(hist_data, file, field_name, val->size, val->type);
3475 if (IS_ERR(var)) {
d0cd871b 3476 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
02205a67
TZ		 3477 kfree(val);
3478 ret = PTR_ERR(var);
3479 goto err;
3480 }
3481
3482 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3483 if (!field_var) {
3484 kfree(val);
3485 kfree(var);
3486 ret = -ENOMEM;
3487 goto err;
3488 }
3489
3490 field_var->var = var;
3491 field_var->val = val;
3492 out:
3493 return field_var;
3494 err:
3495 field_var = ERR_PTR(ret);
3496 goto out;
3497}
3498
3499/**
3500 * create_target_field_var - Automatically create a variable for a field
3501 * @target_hist_data: The target hist trigger
3502 * @subsys_name: Optional subsystem name
3503 * @event_name: Optional event name
3504 * @var_name: The name of the field (and the resulting variable)
3505 *
3506 * Hist trigger actions fetch data from variables, not directly from
3507 * events. However, for convenience, users are allowed to directly
3508 * specify an event field in an action, which will be automatically
3509 * converted into a variable on their behalf.
3510
3511 * This function creates a field variable with the name var_name on
3512 * the hist trigger currently being defined on the target event. If
3513 * subsys_name and event_name are specified, this function simply
3514 * verifies that they do in fact match the target event subsystem and
3515 * event name.
3516 *
3517 * Return: The variable created for the field.
3518 */
c282a386 3519static struct field_var *
02205a67
TZ		 3520create_target_field_var(struct hist_trigger_data *target_hist_data,
3521 char *subsys_name, char *event_name, char *var_name)
3522{
3523 struct trace_event_file *file = target_hist_data->event_file;
3524
3525 if (subsys_name) {
3526 struct trace_event_call *call;
3527
3528 if (!event_name)
3529 return NULL;
3530
3531 call = file->event_call;
3532
3533 if (strcmp(subsys_name, call->class->system) != 0)
3534 return NULL;
3535
3536 if (strcmp(event_name, trace_event_name(call)) != 0)
3537 return NULL;
3538 }
3539
3540 return create_field_var(target_hist_data, file, var_name);
3541}
3542
466f4528
TZ		 3543static bool check_track_val_max(u64 track_val, u64 var_val)
3544{
3545 if (var_val <= track_val)
3546 return false;
3547
3548 return true;
3549}
3550
dff81f55
TZ		 3551static bool check_track_val_changed(u64 track_val, u64 var_val)
3552{
3553 if (var_val == track_val)
3554 return false;
3555
3556 return true;
3557}
3558
466f4528
TZ		 3559static u64 get_track_val(struct hist_trigger_data *hist_data,
3560 struct tracing_map_elt *elt,
3561 struct action_data *data)
50450603 3562{
466f4528
TZ		 3563 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3564 u64 track_val;
3565
3566 track_val = tracing_map_read_var(elt, track_var_idx);
50450603 3567
466f4528
TZ		 3568 return track_val;
3569}
3570
3571static void save_track_val(struct hist_trigger_data *hist_data,
3572 struct tracing_map_elt *elt,
3573 struct action_data *data, u64 var_val)
3574{
3575 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3576
3577 tracing_map_set_var(elt, track_var_idx, var_val);
3578}
3579
3580static void save_track_data(struct hist_trigger_data *hist_data,
3581 struct tracing_map_elt *elt, void *rec,
3582 struct ring_buffer_event *rbe, void *key,
3583 struct action_data *data, u64 *var_ref_vals)
3584{
3585 if (data->track_data.save_data)
3586 data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3587}
3588
3589static bool check_track_val(struct tracing_map_elt *elt,
3590 struct action_data *data,
3591 u64 var_val)
3592{
3593 struct hist_trigger_data *hist_data;
3594 u64 track_val;
3595
3596 hist_data = data->track_data.track_var->hist_data;
3597 track_val = get_track_val(hist_data, elt, data);
3598
3599 return data->track_data.check_val(track_val, var_val);
3600}
3601
a3785b7e
TZ		 3602#ifdef CONFIG_TRACER_SNAPSHOT
3603static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3604{
3605 /* called with tr->max_lock held */
3606 struct track_data *track_data = tr->cond_snapshot->cond_data;
3607 struct hist_elt_data *elt_data, *track_elt_data;
3608 struct snapshot_context *context = cond_data;
9b2ca371 3609 struct action_data *action;
a3785b7e
TZ		 3610 u64 track_val;
3611
3612 if (!track_data)
3613 return false;
3614
9b2ca371
TZ		 3615 action = track_data->action_data;
3616
a3785b7e
TZ		 3617 track_val = get_track_val(track_data->hist_data, context->elt,
3618 track_data->action_data);
3619
9b2ca371
TZ		 3620 if (!action->track_data.check_val(track_data->track_val, track_val))
3621 return false;
3622
a3785b7e
TZ		 3623 track_data->track_val = track_val;
3624 memcpy(track_data->key, context->key, track_data->key_len);
3625
3626 elt_data = context->elt->private_data;
3627 track_elt_data = track_data->elt.private_data;
3628 if (elt_data->comm)
27242c62 3629 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
a3785b7e
TZ		 3630
3631 track_data->updated = true;
3632
3633 return true;
3634}
3635
3636static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3637 struct tracing_map_elt *elt, void *rec,
3638 struct ring_buffer_event *rbe, void *key,
3639 struct action_data *data,
3640 u64 *var_ref_vals)
3641{
3642 struct trace_event_file *file = hist_data->event_file;
3643 struct snapshot_context context;
3644
3645 context.elt = elt;
3646 context.key = key;
3647
3648 tracing_snapshot_cond(file->tr, &context);
3649}
3650
3651static void hist_trigger_print_key(struct seq_file *m,
3652 struct hist_trigger_data *hist_data,
3653 void *key,
3654 struct tracing_map_elt *elt);
3655
3656static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3657{
3658 unsigned int i;
3659
3660 if (!hist_data->n_actions)
3661 return NULL;
3662
3663 for (i = 0; i < hist_data->n_actions; i++) {
3664 struct action_data *data = hist_data->actions[i];
3665
3666 if (data->action == ACTION_SNAPSHOT)
3667 return data;
3668 }
3669
3670 return NULL;
3671}
3672
3673static void track_data_snapshot_print(struct seq_file *m,
3674 struct hist_trigger_data *hist_data)
3675{
3676 struct trace_event_file *file = hist_data->event_file;
3677 struct track_data *track_data;
3678 struct action_data *action;
3679
3680 track_data = tracing_cond_snapshot_data(file->tr);
3681 if (!track_data)
3682 return;
3683
3684 if (!track_data->updated)
3685 return;
3686
3687 action = snapshot_action(hist_data);
3688 if (!action)
3689 return;
3690
3691 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3692 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3693 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3694 action->track_data.var_str, track_data->track_val);
3695
3696 seq_puts(m, "\ttriggered by event with key: ");
3697 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3698 seq_putc(m, '\n');
3699}
3700#else
3701static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3702{
3703 return false;
3704}
3705static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3706 struct tracing_map_elt *elt, void *rec,
3707 struct ring_buffer_event *rbe, void *key,
3708 struct action_data *data,
3709 u64 *var_ref_vals) {}
3710static void track_data_snapshot_print(struct seq_file *m,
3711 struct hist_trigger_data *hist_data) {}
3712#endif /* CONFIG_TRACER_SNAPSHOT */
3713
466f4528
TZ		 3714static void track_data_print(struct seq_file *m,
3715 struct hist_trigger_data *hist_data,
3716 struct tracing_map_elt *elt,
3717 struct action_data *data)
3718{
3719 u64 track_val = get_track_val(hist_data, elt, data);
3720 unsigned int i, save_var_idx;
3721
3722 if (data->handler == HANDLER_ONMAX)
3723 seq_printf(m, "\n\tmax: %10llu", track_val);
dff81f55
TZ		 3724 else if (data->handler == HANDLER_ONCHANGE)
3725 seq_printf(m, "\n\tchanged: %10llu", track_val);
50450603 3726
a3785b7e
TZ		 3727 if (data->action == ACTION_SNAPSHOT)
3728 return;
3729
7d18a10c
TZ		 3730 for (i = 0; i < hist_data->n_save_vars; i++) {
3731 struct hist_field *save_val = hist_data->save_vars[i]->val;
3732 struct hist_field *save_var = hist_data->save_vars[i]->var;
50450603
TZ		 3733 u64 val;
3734
3735 save_var_idx = save_var->var.idx;
3736
3737 val = tracing_map_read_var(elt, save_var_idx);
3738
3739 if (save_val->flags & HIST_FIELD_FL_STRING) {
3740 seq_printf(m, " %s: %-32s", save_var->var.name,
3741 (char *)(uintptr_t)(val));
3742 } else
3743 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3744 }
3745}
3746
466f4528
TZ		 3747static void ontrack_action(struct hist_trigger_data *hist_data,
3748 struct tracing_map_elt *elt, void *rec,
3749 struct ring_buffer_event *rbe, void *key,
3750 struct action_data *data, u64 *var_ref_vals)
50450603 3751{
466f4528 3752 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
50450603 3753
466f4528
TZ		 3754 if (check_track_val(elt, data, var_val)) {
3755 save_track_val(hist_data, elt, data, var_val);
3756 save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3757 }
50450603
TZ		 3758}
3759
c3e49506 3760static void action_data_destroy(struct action_data *data)
50450603
TZ		 3761{
3762 unsigned int i;
3763
c3e49506 3764 lockdep_assert_held(&event_mutex);
50450603 3765
7d18a10c 3766 kfree(data->action_name);
50450603
TZ		 3767
3768 for (i = 0; i < data->n_params; i++)
3769 kfree(data->params[i]);
3770
c3e49506
TZ		 3771 if (data->synth_event)
3772 data->synth_event->ref--;
3773
e91eefd7
TZ		 3774 kfree(data->synth_event_name);
3775
50450603
TZ		 3776 kfree(data);
3777}
3778
466f4528
TZ		 3779static void track_data_destroy(struct hist_trigger_data *hist_data,
3780 struct action_data *data)
c3e49506 3781{
a3785b7e
TZ		 3782 struct trace_event_file *file = hist_data->event_file;
3783
466f4528 3784 destroy_hist_field(data->track_data.track_var, 0);
c3e49506 3785
a3785b7e
TZ		 3786 if (data->action == ACTION_SNAPSHOT) {
3787 struct track_data *track_data;
3788
3789 track_data = tracing_cond_snapshot_data(file->tr);
3790 if (track_data && track_data->hist_data == hist_data) {
3791 tracing_snapshot_cond_disable(file->tr);
3792 track_data_free(track_data);
3793 }
3794 }
3795
466f4528 3796 kfree(data->track_data.var_str);
c3e49506
TZ		 3797
3798 action_data_destroy(data);
3799}
3800
7d18a10c
TZ		 3801static int action_create(struct hist_trigger_data *hist_data,
3802 struct action_data *data);
3803
466f4528
TZ		 3804static int track_data_create(struct hist_trigger_data *hist_data,
3805 struct action_data *data)
50450603 3806{
466f4528 3807 struct hist_field *var_field, *ref_field, *track_var = NULL;
50450603 3808 struct trace_event_file *file = hist_data->event_file;
d0cd871b 3809 struct trace_array *tr = file->tr;
466f4528 3810 char *track_data_var_str;
50450603
TZ		 3811 int ret = 0;
3812
466f4528
TZ		 3813 track_data_var_str = data->track_data.var_str;
3814 if (track_data_var_str[0] != '$') {
d0cd871b 3815 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
50450603 3816 return -EINVAL;
f404da6e 3817 }
466f4528 3818 track_data_var_str++;
50450603 3819
466f4528 3820 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
f404da6e 3821 if (!var_field) {
d0cd871b 3822 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
50450603 3823 return -EINVAL;
f404da6e 3824 }
50450603 3825
de40f033 3826 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
50450603
TZ		 3827 if (!ref_field)
3828 return -ENOMEM;
3829
466f4528 3830 data->track_data.var_ref = ref_field;
50450603 3831
466f4528
TZ		 3832 if (data->handler == HANDLER_ONMAX)
3833 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3834 if (IS_ERR(track_var)) {
d0cd871b 3835 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
466f4528 3836 ret = PTR_ERR(track_var);
50450603
TZ		 3837 goto out;
3838 }
dff81f55
TZ		 3839
3840 if (data->handler == HANDLER_ONCHANGE)
3841 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3842 if (IS_ERR(track_var)) {
d0cd871b 3843 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
dff81f55
TZ		 3844 ret = PTR_ERR(track_var);
3845 goto out;
3846 }
466f4528 3847 data->track_data.track_var = track_var;
50450603 3848
7d18a10c 3849 ret = action_create(hist_data, data);
50450603
TZ		 3850 out:
3851 return ret;
3852}
3853
d0cd871b
SRV		 3854static int parse_action_params(struct trace_array *tr, char *params,
3855 struct action_data *data)
50450603
TZ		 3856{
3857 char *param, *saved_param;
e91eefd7 3858 bool first_param = true;
50450603
TZ		 3859 int ret = 0;
3860
3861 while (params) {
7d18a10c 3862 if (data->n_params >= SYNTH_FIELDS_MAX) {
d0cd871b 3863 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
50450603 3864 goto out;
7d18a10c 3865 }
50450603
TZ		 3866
3867 param = strsep(&params, ",");
3868 if (!param) {
d0cd871b 3869 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
50450603
TZ		 3870 ret = -EINVAL;
3871 goto out;
3872 }
3873
3874 param = strstrip(param);
3875 if (strlen(param) < 2) {
d0cd871b 3876 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
50450603
TZ		 3877 ret = -EINVAL;
3878 goto out;
3879 }
3880
3881 saved_param = kstrdup(param, GFP_KERNEL);
3882 if (!saved_param) {
3883 ret = -ENOMEM;
3884 goto out;
3885 }
3886
e91eefd7
TZ		 3887 if (first_param && data->use_trace_keyword) {
3888 data->synth_event_name = saved_param;
3889 first_param = false;
3890 continue;
3891 }
3892 first_param = false;
3893
50450603
TZ		 3894 data->params[data->n_params++] = saved_param;
3895 }
3896 out:
3897 return ret;
3898}
3899
d0cd871b 3900static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
7d18a10c
TZ		 3901 enum handler_id handler)
3902{
3903 char *action_name;
3904 int ret = 0;
3905
3906 strsep(&str, ".");
3907 if (!str) {
d0cd871b 3908 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3909 ret = -EINVAL;
3910 goto out;
3911 }
3912
3913 action_name = strsep(&str, "(");
3914 if (!action_name || !str) {
d0cd871b 3915 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3916 ret = -EINVAL;
3917 goto out;
3918 }
3919
3920 if (str_has_prefix(action_name, "save")) {
3921 char *params = strsep(&str, ")");
3922
3923 if (!params) {
d0cd871b 3924 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
7d18a10c
TZ		 3925 ret = -EINVAL;
3926 goto out;
3927 }
3928
d0cd871b 3929 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3930 if (ret)
3931 goto out;
3932
3933 if (handler == HANDLER_ONMAX)
466f4528 3934 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3935 else if (handler == HANDLER_ONCHANGE)
3936 data->track_data.check_val = check_track_val_changed;
466f4528 3937 else {
d0cd871b 3938 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
466f4528
TZ		 3939 ret = -EINVAL;
3940 goto out;
3941 }
7d18a10c 3942
466f4528
TZ		 3943 data->track_data.save_data = save_track_data_vars;
3944 data->fn = ontrack_action;
7d18a10c 3945 data->action = ACTION_SAVE;
a3785b7e
TZ		 3946 } else if (str_has_prefix(action_name, "snapshot")) {
3947 char *params = strsep(&str, ")");
3948
3949 if (!str) {
d0cd871b 3950 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
a3785b7e
TZ		 3951 ret = -EINVAL;
3952 goto out;
3953 }
3954
3955 if (handler == HANDLER_ONMAX)
3956 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3957 else if (handler == HANDLER_ONCHANGE)
3958 data->track_data.check_val = check_track_val_changed;
a3785b7e 3959 else {
d0cd871b 3960 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
a3785b7e
TZ		 3961 ret = -EINVAL;
3962 goto out;
3963 }
3964
3965 data->track_data.save_data = save_track_data_snapshot;
3966 data->fn = ontrack_action;
3967 data->action = ACTION_SNAPSHOT;
7d18a10c
TZ		 3968 } else {
3969 char *params = strsep(&str, ")");
3970
e91eefd7
TZ		 3971 if (str_has_prefix(action_name, "trace"))
3972 data->use_trace_keyword = true;
3973
7d18a10c 3974 if (params) {
d0cd871b 3975 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3976 if (ret)
3977 goto out;
3978 }
3979
466f4528
TZ		 3980 if (handler == HANDLER_ONMAX)
3981 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3982 else if (handler == HANDLER_ONCHANGE)
3983 data->track_data.check_val = check_track_val_changed;
466f4528
TZ		 3984
3985 if (handler != HANDLER_ONMATCH) {
3986 data->track_data.save_data = action_trace;
3987 data->fn = ontrack_action;
3988 } else
3989 data->fn = action_trace;
3990
7d18a10c
TZ		 3991 data->action = ACTION_TRACE;
3992 }
3993
3994 data->action_name = kstrdup(action_name, GFP_KERNEL);
3995 if (!data->action_name) {
3996 ret = -ENOMEM;
3997 goto out;
3998 }
3999
4000 data->handler = handler;
4001 out:
4002 return ret;
4003}
4004
466f4528
TZ		 4005static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
4006 char *str, enum handler_id handler)
50450603 4007{
50450603
TZ		 4008 struct action_data *data;
4009 int ret = -EINVAL;
466f4528 4010 char *var_str;
50450603
TZ		 4011
4012 data = kzalloc(sizeof(*data), GFP_KERNEL);
4013 if (!data)
4014 return ERR_PTR(-ENOMEM);
4015
466f4528
TZ		 4016 var_str = strsep(&str, ")");
4017 if (!var_str || !str) {
50450603
TZ		 4018 ret = -EINVAL;
4019 goto free;
4020 }
4021
466f4528
TZ		 4022 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
4023 if (!data->track_data.var_str) {
50450603
TZ		 4024 ret = -ENOMEM;
4025 goto free;
4026 }
4027
d0cd871b 4028 ret = action_parse(hist_data->event_file->tr, str, data, handler);
7d18a10c 4029 if (ret)
50450603 4030 goto free;
50450603
TZ		 4031 out:
4032 return data;
4033 free:
466f4528 4034 track_data_destroy(hist_data, data);
50450603
TZ		 4035 data = ERR_PTR(ret);
4036 goto out;
4037}
4038
c282a386
TZ		 4039static void onmatch_destroy(struct action_data *data)
4040{
c3e49506
TZ		 4041 kfree(data->match_data.event);
4042 kfree(data->match_data.event_system);
c282a386 4043
c3e49506 4044 action_data_destroy(data);
c282a386
TZ		 4045}
4046
02205a67
TZ		 4047static void destroy_field_var(struct field_var *field_var)
4048{
4049 if (!field_var)
4050 return;
4051
4052 destroy_hist_field(field_var->var, 0);
4053 destroy_hist_field(field_var->val, 0);
4054
4055 kfree(field_var);
4056}
4057
4058static void destroy_field_vars(struct hist_trigger_data *hist_data)
4059{
4060 unsigned int i;
4061
4062 for (i = 0; i < hist_data->n_field_vars; i++)
4063 destroy_field_var(hist_data->field_vars[i]);
4064}
4065
c282a386
TZ		 4066static void save_field_var(struct hist_trigger_data *hist_data,
4067 struct field_var *field_var)
02205a67
TZ		 4068{
4069 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
4070
4071 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4072 hist_data->n_field_var_str++;
4073}
4074
c282a386 4075
c282a386
TZ		 4076static int check_synth_field(struct synth_event *event,
4077 struct hist_field *hist_field,
4078 unsigned int field_pos)
4079{
4080 struct synth_field *field;
4081
4082 if (field_pos >= event->n_fields)
4083 return -EINVAL;
4084
4085 field = event->fields[field_pos];
4086
4087 if (strcmp(field->type, hist_field->type) != 0)
4088 return -EINVAL;
4089
4090 return 0;
4091}
4092
c282a386 4093static struct hist_field *
7d18a10c
TZ		 4094trace_action_find_var(struct hist_trigger_data *hist_data,
4095 struct action_data *data,
4096 char *system, char *event, char *var)
c282a386 4097{
d0cd871b 4098 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 4099 struct hist_field *hist_field;
4100
4101 var++; /* skip '$' */
4102
4103 hist_field = find_target_event_var(hist_data, system, event, var);
4104 if (!hist_field) {
7d18a10c 4105 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4106 system = data->match_data.event_system;
4107 event = data->match_data.event;
c282a386
TZ		 4108 }
4109
4110 hist_field = find_event_var(hist_data, system, event, var);
4111 }
4112
f404da6e 4113 if (!hist_field)
d0cd871b 4114 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
f404da6e 4115
c282a386
TZ		 4116 return hist_field;
4117}
4118
4119static struct hist_field *
7d18a10c
TZ		 4120trace_action_create_field_var(struct hist_trigger_data *hist_data,
4121 struct action_data *data, char *system,
4122 char *event, char *var)
c282a386
TZ		 4123{
4124 struct hist_field *hist_field = NULL;
4125 struct field_var *field_var;
4126
4127 /*
4128 * First try to create a field var on the target event (the
4129 * currently being defined). This will create a variable for
4130 * unqualified fields on the target event, or if qualified,
4131 * target fields that have qualified names matching the target.
4132 */
4133 field_var = create_target_field_var(hist_data, system, event, var);
4134
4135 if (field_var && !IS_ERR(field_var)) {
4136 save_field_var(hist_data, field_var);
4137 hist_field = field_var->var;
4138 } else {
4139 field_var = NULL;
4140 /*
4141 * If no explicit system.event is specfied, default to
4142 * looking for fields on the onmatch(system.event.xxx)
4143 * event.
4144 */
7d18a10c 4145 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4146 system = data->match_data.event_system;
4147 event = data->match_data.event;
c282a386
TZ		 4148 }
4149
4150 /*
4151 * At this point, we're looking at a field on another
4152 * event. Because we can't modify a hist trigger on
4153 * another event to add a variable for a field, we need
4154 * to create a new trigger on that event and create the
4155 * variable at the same time.
4156 */
4157 hist_field = create_field_var_hist(hist_data, system, event, var);
4158 if (IS_ERR(hist_field))
4159 goto free;
4160 }
4161 out:
4162 return hist_field;
4163 free:
4164 destroy_field_var(field_var);
4165 hist_field = NULL;
4166 goto out;
4167}
4168
7d18a10c
TZ		 4169static int trace_action_create(struct hist_trigger_data *hist_data,
4170 struct action_data *data)
c282a386 4171{
d0cd871b 4172 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 4173 char *event_name, *param, *system = NULL;
4174 struct hist_field *hist_field, *var_ref;
4175 unsigned int i, var_ref_idx;
4176 unsigned int field_pos = 0;
4177 struct synth_event *event;
e91eefd7 4178 char *synth_event_name;
c282a386
TZ		 4179 int ret = 0;
4180
0e2b81f7
MH		 4181 lockdep_assert_held(&event_mutex);
4182
e91eefd7
TZ		 4183 if (data->use_trace_keyword)
4184 synth_event_name = data->synth_event_name;
4185 else
4186 synth_event_name = data->action_name;
4187
4188 event = find_synth_event(synth_event_name);
c282a386 4189 if (!event) {
d0cd871b 4190 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
c282a386
TZ		 4191 return -EINVAL;
4192 }
7d18a10c 4193
c282a386 4194 event->ref++;
c282a386
TZ		 4195
4196 var_ref_idx = hist_data->n_var_refs;
4197
4198 for (i = 0; i < data->n_params; i++) {
4199 char *p;
4200
4201 p = param = kstrdup(data->params[i], GFP_KERNEL);
4202 if (!param) {
4203 ret = -ENOMEM;
4204 goto err;
4205 }
4206
4207 system = strsep(&param, ".");
4208 if (!param) {
4209 param = (char *)system;
4210 system = event_name = NULL;
4211 } else {
4212 event_name = strsep(&param, ".");
4213 if (!param) {
4214 kfree(p);
4215 ret = -EINVAL;
4216 goto err;
4217 }
4218 }
4219
4220 if (param[0] == '$')
7d18a10c
TZ		 4221 hist_field = trace_action_find_var(hist_data, data,
4222 system, event_name,
4223 param);
c282a386 4224 else
7d18a10c
TZ		 4225 hist_field = trace_action_create_field_var(hist_data,
4226 data,
4227 system,
4228 event_name,
4229 param);
c282a386
TZ		 4230
4231 if (!hist_field) {
4232 kfree(p);
4233 ret = -EINVAL;
4234 goto err;
4235 }
4236
4237 if (check_synth_field(event, hist_field, field_pos) == 0) {
de40f033
TZ		 4238 var_ref = create_var_ref(hist_data, hist_field,
4239 system, event_name);
c282a386
TZ		 4240 if (!var_ref) {
4241 kfree(p);
4242 ret = -ENOMEM;
4243 goto err;
4244 }
4245
c282a386
TZ		 4246 field_pos++;
4247 kfree(p);
4248 continue;
4249 }
4250
d0cd871b 4251 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
c282a386
TZ		 4252 kfree(p);
4253 ret = -EINVAL;
4254 goto err;
4255 }
4256
4257 if (field_pos != event->n_fields) {
d0cd871b 4258 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
c282a386
TZ		 4259 ret = -EINVAL;
4260 goto err;
4261 }
4262
c3e49506
TZ		 4263 data->synth_event = event;
4264 data->var_ref_idx = var_ref_idx;
c282a386
TZ		 4265 out:
4266 return ret;
4267 err:
c282a386 4268 event->ref--;
c282a386
TZ		 4269
4270 goto out;
4271}
4272
7d18a10c
TZ		 4273static int action_create(struct hist_trigger_data *hist_data,
4274 struct action_data *data)
4275{
a3785b7e 4276 struct trace_event_file *file = hist_data->event_file;
d0cd871b 4277 struct trace_array *tr = file->tr;
a3785b7e 4278 struct track_data *track_data;
7d18a10c
TZ		 4279 struct field_var *field_var;
4280 unsigned int i;
4281 char *param;
4282 int ret = 0;
4283
4284 if (data->action == ACTION_TRACE)
4285 return trace_action_create(hist_data, data);
4286
a3785b7e
TZ		 4287 if (data->action == ACTION_SNAPSHOT) {
4288 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4289 if (IS_ERR(track_data)) {
4290 ret = PTR_ERR(track_data);
4291 goto out;
4292 }
4293
4294 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4295 cond_snapshot_update);
4296 if (ret)
4297 track_data_free(track_data);
4298
4299 goto out;
4300 }
4301
7d18a10c
TZ		 4302 if (data->action == ACTION_SAVE) {
4303 if (hist_data->n_save_vars) {
4304 ret = -EEXIST;
d0cd871b 4305 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
7d18a10c
TZ		 4306 goto out;
4307 }
4308
4309 for (i = 0; i < data->n_params; i++) {
4310 param = kstrdup(data->params[i], GFP_KERNEL);
4311 if (!param) {
4312 ret = -ENOMEM;
4313 goto out;
4314 }
4315
4316 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4317 if (IS_ERR(field_var)) {
d0cd871b
SRV		 4318 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
4319 errpos(param));
7d18a10c
TZ		 4320 ret = PTR_ERR(field_var);
4321 kfree(param);
4322 goto out;
4323 }
4324
4325 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4326 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4327 hist_data->n_save_var_str++;
4328 kfree(param);
4329 }
4330 }
4331 out:
4332 return ret;
4333}
4334
4335static int onmatch_create(struct hist_trigger_data *hist_data,
4336 struct action_data *data)
4337{
4338 return action_create(hist_data, data);
4339}
4340
c282a386
TZ		 4341static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4342{
4343 char *match_event, *match_event_system;
c282a386
TZ		 4344 struct action_data *data;
4345 int ret = -EINVAL;
4346
4347 data = kzalloc(sizeof(*data), GFP_KERNEL);
4348 if (!data)
4349 return ERR_PTR(-ENOMEM);
4350
4351 match_event = strsep(&str, ")");
f404da6e 4352 if (!match_event || !str) {
d0cd871b 4353 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
c282a386 4354 goto free;
f404da6e 4355 }
c282a386
TZ		 4356
4357 match_event_system = strsep(&match_event, ".");
f404da6e 4358 if (!match_event) {
d0cd871b 4359 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
c282a386 4360 goto free;
f404da6e 4361 }
c282a386 4362
f404da6e 4363 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
d0cd871b 4364 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
c282a386 4365 goto free;
f404da6e 4366 }
c282a386 4367
c3e49506
TZ		 4368 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4369 if (!data->match_data.event) {
c282a386
TZ		 4370 ret = -ENOMEM;
4371 goto free;
4372 }
4373
c3e49506
TZ		 4374 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4375 if (!data->match_data.event_system) {
c282a386
TZ		 4376 ret = -ENOMEM;
4377 goto free;
4378 }
4379
d0cd871b 4380 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
c282a386
TZ		 4381 if (ret)
4382 goto free;
4383 out:
4384 return data;
4385 free:
4386 onmatch_destroy(data);
4387 data = ERR_PTR(ret);
4388 goto out;
4389}
4390
7ef224d1
TZ		 4391static int create_hitcount_val(struct hist_trigger_data *hist_data)
4392{
4393 hist_data->fields[HITCOUNT_IDX] =
30350d65 4394 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
7ef224d1
TZ		 4395 if (!hist_data->fields[HITCOUNT_IDX])
4396 return -ENOMEM;
4397
4398 hist_data->n_vals++;
30350d65 4399 hist_data->n_fields++;
7ef224d1
TZ		 4400
4401 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4402 return -EINVAL;
4403
4404 return 0;
4405}
4406
30350d65
TZ		 4407static int __create_val_field(struct hist_trigger_data *hist_data,
4408 unsigned int val_idx,
4409 struct trace_event_file *file,
4410 char *var_name, char *field_str,
4411 unsigned long flags)
f2606835 4412{
100719dc 4413 struct hist_field *hist_field;
f2606835
TZ		 4414 int ret = 0;
4415
100719dc
TZ		 4416 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
4417 if (IS_ERR(hist_field)) {
4418 ret = PTR_ERR(hist_field);
f2606835
TZ		 4419 goto out;
4420 }
4421
100719dc
TZ		 4422 hist_data->fields[val_idx] = hist_field;
4423
f2606835 4424 ++hist_data->n_vals;
30350d65 4425 ++hist_data->n_fields;
f2606835 4426
30350d65 4427 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
f2606835
TZ		 4428 ret = -EINVAL;
4429 out:
4430 return ret;
4431}
4432
30350d65
TZ		 4433static int create_val_field(struct hist_trigger_data *hist_data,
4434 unsigned int val_idx,
4435 struct trace_event_file *file,
4436 char *field_str)
4437{
4438 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4439 return -EINVAL;
4440
4441 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4442}
4443
4444static int create_var_field(struct hist_trigger_data *hist_data,
4445 unsigned int val_idx,
4446 struct trace_event_file *file,
4447 char *var_name, char *expr_str)
4448{
d0cd871b 4449 struct trace_array *tr = hist_data->event_file->tr;
30350d65
TZ		 4450 unsigned long flags = 0;
4451
4452 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4453 return -EINVAL;
f404da6e 4454
30350d65 4455 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
d0cd871b 4456 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
30350d65
TZ		 4457 return -EINVAL;
4458 }
4459
4460 flags |= HIST_FIELD_FL_VAR;
4461 hist_data->n_vars++;
4462 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4463 return -EINVAL;
4464
4465 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4466}
4467
7ef224d1
TZ		 4468static int create_val_fields(struct hist_trigger_data *hist_data,
4469 struct trace_event_file *file)
4470{
f2606835 4471 char *fields_str, *field_str;
30350d65 4472 unsigned int i, j = 1;
7ef224d1
TZ		 4473 int ret;
4474
4475 ret = create_hitcount_val(hist_data);
f2606835
TZ		 4476 if (ret)
4477 goto out;
7ef224d1 4478
f2606835
TZ		 4479 fields_str = hist_data->attrs->vals_str;
4480 if (!fields_str)
4481 goto out;
4482
4483 strsep(&fields_str, "=");
4484 if (!fields_str)
4485 goto out;
4486
4487 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4488 j < TRACING_MAP_VALS_MAX; i++) {
4489 field_str = strsep(&fields_str, ",");
4490 if (!field_str)
4491 break;
30350d65 4492
f2606835
TZ		 4493 if (strcmp(field_str, "hitcount") == 0)
4494 continue;
30350d65 4495
f2606835
TZ		 4496 ret = create_val_field(hist_data, j++, file, field_str);
4497 if (ret)
4498 goto out;
4499 }
30350d65 4500
f2606835
TZ		 4501 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4502 ret = -EINVAL;
4503 out:
7ef224d1
TZ		 4504 return ret;
4505}
4506
4507static int create_key_field(struct hist_trigger_data *hist_data,
4508 unsigned int key_idx,
76a3b0c8 4509 unsigned int key_offset,
7ef224d1
TZ		 4510 struct trace_event_file *file,
4511 char *field_str)
4512{
d0cd871b 4513 struct trace_array *tr = hist_data->event_file->tr;
30350d65 4514 struct hist_field *hist_field = NULL;
7ef224d1
TZ		 4515 unsigned long flags = 0;
4516 unsigned int key_size;
4517 int ret = 0;
4518
30350d65 4519 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
7ef224d1
TZ		 4520 return -EINVAL;
4521
4522 flags |= HIST_FIELD_FL_KEY;
4523
69a0200c
TZ		 4524 if (strcmp(field_str, "stacktrace") == 0) {
4525 flags |= HIST_FIELD_FL_STACKTRACE;
4526 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
30350d65 4527 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
69a0200c 4528 } else {
100719dc
TZ		 4529 hist_field = parse_expr(hist_data, file, field_str, flags,
4530 NULL, 0);
4531 if (IS_ERR(hist_field)) {
4532 ret = PTR_ERR(hist_field);
4533 goto out;
69a0200c
TZ		 4534 }
4535
c8d94a18 4536 if (field_has_hist_vars(hist_field, 0)) {
d0cd871b 4537 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
067fe038
TZ		 4538 destroy_hist_field(hist_field, 0);
4539 ret = -EINVAL;
4540 goto out;
4541 }
4542
100719dc 4543 key_size = hist_field->size;
7ef224d1
TZ		 4544 }
4545
100719dc 4546 hist_data->fields[key_idx] = hist_field;
7ef224d1
TZ		 4547
4548 key_size = ALIGN(key_size, sizeof(u64));
4549 hist_data->fields[key_idx]->size = key_size;
76a3b0c8 4550 hist_data->fields[key_idx]->offset = key_offset;
100719dc 4551
76a3b0c8 4552 hist_data->key_size += key_size;
100719dc 4553
7ef224d1
TZ		 4554 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4555 ret = -EINVAL;
4556 goto out;
4557 }
4558
4559 hist_data->n_keys++;
30350d65 4560 hist_data->n_fields++;
7ef224d1
TZ		 4561
4562 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4563 return -EINVAL;
4564
4565 ret = key_size;
4566 out:
4567 return ret;
4568}
4569
4570static int create_key_fields(struct hist_trigger_data *hist_data,
4571 struct trace_event_file *file)
4572{
76a3b0c8 4573 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
7ef224d1
TZ		 4574 char *fields_str, *field_str;
4575 int ret = -EINVAL;
4576
4577 fields_str = hist_data->attrs->keys_str;
4578 if (!fields_str)
4579 goto out;
4580
4581 strsep(&fields_str, "=");
4582 if (!fields_str)
4583 goto out;
4584
76a3b0c8 4585 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
7ef224d1
TZ		 4586 field_str = strsep(&fields_str, ",");
4587 if (!field_str)
4588 break;
76a3b0c8
TZ		 4589 ret = create_key_field(hist_data, i, key_offset,
4590 file, field_str);
7ef224d1
TZ		 4591 if (ret < 0)
4592 goto out;
76a3b0c8 4593 key_offset += ret;
7ef224d1
TZ		 4594 }
4595 if (fields_str) {
4596 ret = -EINVAL;
4597 goto out;
4598 }
4599 ret = 0;
4600 out:
4601 return ret;
4602}
4603
30350d65
TZ		 4604static int create_var_fields(struct hist_trigger_data *hist_data,
4605 struct trace_event_file *file)
4606{
4607 unsigned int i, j = hist_data->n_vals;
4608 int ret = 0;
4609
4610 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4611
4612 for (i = 0; i < n_vars; i++) {
4613 char *var_name = hist_data->attrs->var_defs.name[i];
4614 char *expr = hist_data->attrs->var_defs.expr[i];
4615
4616 ret = create_var_field(hist_data, j++, file, var_name, expr);
4617 if (ret)
4618 goto out;
4619 }
4620 out:
4621 return ret;
4622}
4623
4624static void free_var_defs(struct hist_trigger_data *hist_data)
4625{
4626 unsigned int i;
4627
4628 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4629 kfree(hist_data->attrs->var_defs.name[i]);
4630 kfree(hist_data->attrs->var_defs.expr[i]);
4631 }
4632
4633 hist_data->attrs->var_defs.n_vars = 0;
4634}
4635
4636static int parse_var_defs(struct hist_trigger_data *hist_data)
4637{
d0cd871b 4638 struct trace_array *tr = hist_data->event_file->tr;
30350d65
TZ		 4639 char *s, *str, *var_name, *field_str;
4640 unsigned int i, j, n_vars = 0;
4641 int ret = 0;
4642
4643 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4644 str = hist_data->attrs->assignment_str[i];
4645 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4646 field_str = strsep(&str, ",");
4647 if (!field_str)
4648 break;
4649
4650 var_name = strsep(&field_str, "=");
4651 if (!var_name || !field_str) {
d0cd871b
SRV		 4652 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4653 errpos(var_name));
30350d65
TZ		 4654 ret = -EINVAL;
4655 goto free;
4656 }
4657
4658 if (n_vars == TRACING_MAP_VARS_MAX) {
d0cd871b 4659 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
30350d65
TZ		 4660 ret = -EINVAL;
4661 goto free;
4662 }
4663
4664 s = kstrdup(var_name, GFP_KERNEL);
4665 if (!s) {
4666 ret = -ENOMEM;
4667 goto free;
4668 }
4669 hist_data->attrs->var_defs.name[n_vars] = s;
4670
4671 s = kstrdup(field_str, GFP_KERNEL);
4672 if (!s) {
4673 kfree(hist_data->attrs->var_defs.name[n_vars]);
4674 ret = -ENOMEM;
4675 goto free;
4676 }
4677 hist_data->attrs->var_defs.expr[n_vars++] = s;
4678
4679 hist_data->attrs->var_defs.n_vars = n_vars;
4680 }
4681 }
4682
4683 return ret;
4684 free:
4685 free_var_defs(hist_data);
4686
4687 return ret;
4688}
4689
7ef224d1
TZ		 4690static int create_hist_fields(struct hist_trigger_data *hist_data,
4691 struct trace_event_file *file)
4692{
4693 int ret;
4694
30350d65
TZ		 4695 ret = parse_var_defs(hist_data);
4696 if (ret)
4697 goto out;
4698
7ef224d1
TZ		 4699 ret = create_val_fields(hist_data, file);
4700 if (ret)
4701 goto out;
4702
30350d65 4703 ret = create_var_fields(hist_data, file);
7ef224d1
TZ		 4704 if (ret)
4705 goto out;
4706
30350d65
TZ		 4707 ret = create_key_fields(hist_data, file);
4708 if (ret)
4709 goto out;
7ef224d1 4710 out:
30350d65
TZ		 4711 free_var_defs(hist_data);
4712
7ef224d1
TZ		 4713 return ret;
4714}
4715
e62347d2
TZ		 4716static int is_descending(const char *str)
4717{
4718 if (!str)
4719 return 0;
4720
4721 if (strcmp(str, "descending") == 0)
4722 return 1;
4723
4724 if (strcmp(str, "ascending") == 0)
4725 return 0;
4726
4727 return -EINVAL;
4728}
4729
7ef224d1
TZ		 4730static int create_sort_keys(struct hist_trigger_data *hist_data)
4731{
e62347d2 4732 char *fields_str = hist_data->attrs->sort_key_str;
e62347d2
TZ		 4733 struct tracing_map_sort_key *sort_key;
4734 int descending, ret = 0;
30350d65 4735 unsigned int i, j, k;
e62347d2
TZ		 4736
4737 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4738
4739 if (!fields_str)
4740 goto out;
4741
4742 strsep(&fields_str, "=");
4743 if (!fields_str) {
4744 ret = -EINVAL;
4745 goto out;
4746 }
4747
4748 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
85013256 4749 struct hist_field *hist_field;
e62347d2 4750 char *field_str, *field_name;
85013256 4751 const char *test_name;
e62347d2
TZ		 4752
4753 sort_key = &hist_data->sort_keys[i];
4754
4755 field_str = strsep(&fields_str, ",");
4756 if (!field_str) {
4757 if (i == 0)
4758 ret = -EINVAL;
4759 break;
4760 }
4761
4762 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4763 ret = -EINVAL;
4764 break;
4765 }
7ef224d1 4766
e62347d2
TZ		 4767 field_name = strsep(&field_str, ".");
4768 if (!field_name) {
4769 ret = -EINVAL;
4770 break;
4771 }
4772
4773 if (strcmp(field_name, "hitcount") == 0) {
4774 descending = is_descending(field_str);
4775 if (descending < 0) {
4776 ret = descending;
4777 break;
4778 }
4779 sort_key->descending = descending;
4780 continue;
4781 }
7ef224d1 4782
30350d65
TZ		 4783 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4784 unsigned int idx;
4785
85013256 4786 hist_field = hist_data->fields[j];
30350d65
TZ		 4787 if (hist_field->flags & HIST_FIELD_FL_VAR)
4788 continue;
4789
4790 idx = k++;
4791
85013256
TZ		 4792 test_name = hist_field_name(hist_field, 0);
4793
4794 if (strcmp(field_name, test_name) == 0) {
30350d65 4795 sort_key->field_idx = idx;
e62347d2
TZ		 4796 descending = is_descending(field_str);
4797 if (descending < 0) {
4798 ret = descending;
4799 goto out;
4800 }
4801 sort_key->descending = descending;
4802 break;
4803 }
4804 }
4805 if (j == hist_data->n_fields) {
4806 ret = -EINVAL;
4807 break;
4808 }
4809 }
30350d65 4810
e62347d2
TZ		 4811 hist_data->n_sort_keys = i;
4812 out:
7ef224d1
TZ		 4813 return ret;
4814}
4815
0212e2aa
TZ		 4816static void destroy_actions(struct hist_trigger_data *hist_data)
4817{
4818 unsigned int i;
4819
4820 for (i = 0; i < hist_data->n_actions; i++) {
4821 struct action_data *data = hist_data->actions[i];
4822
7d18a10c 4823 if (data->handler == HANDLER_ONMATCH)
c282a386 4824 onmatch_destroy(data);
dff81f55
TZ		 4825 else if (data->handler == HANDLER_ONMAX ||
4826 data->handler == HANDLER_ONCHANGE)
466f4528 4827 track_data_destroy(hist_data, data);
c282a386
TZ		 4828 else
4829 kfree(data);
0212e2aa
TZ		 4830 }
4831}
4832
4833static int parse_actions(struct hist_trigger_data *hist_data)
4834{
c282a386
TZ		 4835 struct trace_array *tr = hist_data->event_file->tr;
4836 struct action_data *data;
0212e2aa
TZ		 4837 unsigned int i;
4838 int ret = 0;
4839 char *str;
036876fa 4840 int len;
0212e2aa
TZ		 4841
4842 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4843 str = hist_data->attrs->action_str[i];
c282a386 4844
036876fa
SRV		 4845 if ((len = str_has_prefix(str, "onmatch("))) {
4846 char *action_str = str + len;
c282a386
TZ		 4847
4848 data = onmatch_parse(tr, action_str);
4849 if (IS_ERR(data)) {
4850 ret = PTR_ERR(data);
4851 break;
4852 }
036876fa
SRV		 4853 } else if ((len = str_has_prefix(str, "onmax("))) {
4854 char *action_str = str + len;
50450603 4855
466f4528
TZ		 4856 data = track_data_parse(hist_data, action_str,
4857 HANDLER_ONMAX);
50450603
TZ		 4858 if (IS_ERR(data)) {
4859 ret = PTR_ERR(data);
4860 break;
4861 }
dff81f55
TZ		 4862 } else if ((len = str_has_prefix(str, "onchange("))) {
4863 char *action_str = str + len;
4864
4865 data = track_data_parse(hist_data, action_str,
4866 HANDLER_ONCHANGE);
4867 if (IS_ERR(data)) {
4868 ret = PTR_ERR(data);
4869 break;
4870 }
c282a386
TZ		 4871 } else {
4872 ret = -EINVAL;
4873 break;
4874 }
4875
4876 hist_data->actions[hist_data->n_actions++] = data;
0212e2aa
TZ		 4877 }
4878
4879 return ret;
4880}
4881
7d18a10c 4882static int create_actions(struct hist_trigger_data *hist_data)
0212e2aa
TZ		 4883{
4884 struct action_data *data;
4885 unsigned int i;
4886 int ret = 0;
4887
4888 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4889 data = hist_data->actions[i];
c282a386 4890
7d18a10c
TZ		 4891 if (data->handler == HANDLER_ONMATCH) {
4892 ret = onmatch_create(hist_data, data);
c282a386 4893 if (ret)
7d18a10c 4894 break;
dff81f55
TZ		 4895 } else if (data->handler == HANDLER_ONMAX ||
4896 data->handler == HANDLER_ONCHANGE) {
466f4528 4897 ret = track_data_create(hist_data, data);
50450603 4898 if (ret)
7d18a10c
TZ		 4899 break;
4900 } else {
4901 ret = -EINVAL;
4902 break;
c282a386 4903 }
0212e2aa
TZ		 4904 }
4905
4906 return ret;
4907}
4908
50450603
TZ		 4909static void print_actions(struct seq_file *m,
4910 struct hist_trigger_data *hist_data,
4911 struct tracing_map_elt *elt)
4912{
4913 unsigned int i;
4914
4915 for (i = 0; i < hist_data->n_actions; i++) {
4916 struct action_data *data = hist_data->actions[i];
4917
a3785b7e
TZ		 4918 if (data->action == ACTION_SNAPSHOT)
4919 continue;
4920
dff81f55
TZ		 4921 if (data->handler == HANDLER_ONMAX ||
4922 data->handler == HANDLER_ONCHANGE)
466f4528 4923 track_data_print(m, hist_data, elt, data);
50450603
TZ		 4924 }
4925}
4926
7d18a10c
TZ		 4927static void print_action_spec(struct seq_file *m,
4928 struct hist_trigger_data *hist_data,
4929 struct action_data *data)
4930{
4931 unsigned int i;
4932
4933 if (data->action == ACTION_SAVE) {
4934 for (i = 0; i < hist_data->n_save_vars; i++) {
4935 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4936 if (i < hist_data->n_save_vars - 1)
4937 seq_puts(m, ",");
4938 }
4939 } else if (data->action == ACTION_TRACE) {
e91eefd7
TZ		 4940 if (data->use_trace_keyword)
4941 seq_printf(m, "%s", data->synth_event_name);
7d18a10c 4942 for (i = 0; i < data->n_params; i++) {
e91eefd7 4943 if (i || data->use_trace_keyword)
7d18a10c
TZ		 4944 seq_puts(m, ",");
4945 seq_printf(m, "%s", data->params[i]);
4946 }
4947 }
4948}
4949
466f4528
TZ		 4950static void print_track_data_spec(struct seq_file *m,
4951 struct hist_trigger_data *hist_data,
4952 struct action_data *data)
50450603 4953{
466f4528
TZ		 4954 if (data->handler == HANDLER_ONMAX)
4955 seq_puts(m, ":onmax(");
dff81f55
TZ		 4956 else if (data->handler == HANDLER_ONCHANGE)
4957 seq_puts(m, ":onchange(");
466f4528 4958 seq_printf(m, "%s", data->track_data.var_str);
7d18a10c
TZ		 4959 seq_printf(m, ").%s(", data->action_name);
4960
4961 print_action_spec(m, hist_data, data);
50450603 4962
50450603
TZ		 4963 seq_puts(m, ")");
4964}
4965
c282a386
TZ		 4966static void print_onmatch_spec(struct seq_file *m,
4967 struct hist_trigger_data *hist_data,
4968 struct action_data *data)
4969{
c3e49506
TZ		 4970 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4971 data->match_data.event);
c282a386 4972
7d18a10c 4973 seq_printf(m, "%s(", data->action_name);
c282a386 4974
7d18a10c 4975 print_action_spec(m, hist_data, data);
c282a386
TZ		 4976
4977 seq_puts(m, ")");
4978}
4979
48f79473
TZ		 4980static bool actions_match(struct hist_trigger_data *hist_data,
4981 struct hist_trigger_data *hist_data_test)
4982{
4983 unsigned int i, j;
4984
4985 if (hist_data->n_actions != hist_data_test->n_actions)
4986 return false;
4987
4988 for (i = 0; i < hist_data->n_actions; i++) {
4989 struct action_data *data = hist_data->actions[i];
4990 struct action_data *data_test = hist_data_test->actions[i];
e91eefd7 4991 char *action_name, *action_name_test;
48f79473 4992
7d18a10c
TZ		 4993 if (data->handler != data_test->handler)
4994 return false;
4995 if (data->action != data_test->action)
48f79473
TZ		 4996 return false;
4997
4998 if (data->n_params != data_test->n_params)
4999 return false;
5000
5001 for (j = 0; j < data->n_params; j++) {
5002 if (strcmp(data->params[j], data_test->params[j]) != 0)
5003 return false;
5004 }
5005
e91eefd7
TZ		 5006 if (data->use_trace_keyword)
5007 action_name = data->synth_event_name;
5008 else
5009 action_name = data->action_name;
5010
5011 if (data_test->use_trace_keyword)
5012 action_name_test = data_test->synth_event_name;
5013 else
5014 action_name_test = data_test->action_name;
5015
5016 if (strcmp(action_name, action_name_test) != 0)
7d18a10c
TZ		 5017 return false;
5018
5019 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 5020 if (strcmp(data->match_data.event_system,
5021 data_test->match_data.event_system) != 0)
48f79473 5022 return false;
c3e49506
TZ		 5023 if (strcmp(data->match_data.event,
5024 data_test->match_data.event) != 0)
48f79473 5025 return false;
dff81f55
TZ		 5026 } else if (data->handler == HANDLER_ONMAX ||
5027 data->handler == HANDLER_ONCHANGE) {
466f4528
TZ		 5028 if (strcmp(data->track_data.var_str,
5029 data_test->track_data.var_str) != 0)
48f79473 5030 return false;
48f79473
TZ		 5031 }
5032 }
5033
5034 return true;
5035}
5036
5037
c282a386
TZ		 5038static void print_actions_spec(struct seq_file *m,
5039 struct hist_trigger_data *hist_data)
5040{
5041 unsigned int i;
5042
5043 for (i = 0; i < hist_data->n_actions; i++) {
5044 struct action_data *data = hist_data->actions[i];
5045
7d18a10c 5046 if (data->handler == HANDLER_ONMATCH)
c282a386 5047 print_onmatch_spec(m, hist_data, data);
dff81f55
TZ		 5048 else if (data->handler == HANDLER_ONMAX ||
5049 data->handler == HANDLER_ONCHANGE)
466f4528 5050 print_track_data_spec(m, hist_data, data);
c282a386
TZ		 5051 }
5052}
5053
02205a67
TZ		 5054static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
5055{
5056 unsigned int i;
5057
5058 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5059 kfree(hist_data->field_var_hists[i]->cmd);
5060 kfree(hist_data->field_var_hists[i]);
5061 }
5062}
5063
7ef224d1
TZ		 5064static void destroy_hist_data(struct hist_trigger_data *hist_data)
5065{
0212e2aa
TZ		 5066 if (!hist_data)
5067 return;
5068
7ef224d1
TZ		 5069 destroy_hist_trigger_attrs(hist_data->attrs);
5070 destroy_hist_fields(hist_data);
5071 tracing_map_destroy(hist_data->map);
0212e2aa
TZ		 5072
5073 destroy_actions(hist_data);
02205a67
TZ		 5074 destroy_field_vars(hist_data);
5075 destroy_field_var_hists(hist_data);
0212e2aa 5076
7ef224d1
TZ		 5077 kfree(hist_data);
5078}
5079
5080static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
5081{
5082 struct tracing_map *map = hist_data->map;
5083 struct ftrace_event_field *field;
5084 struct hist_field *hist_field;
b28d7b2d 5085 int i, idx = 0;
7ef224d1
TZ		 5086
5087 for_each_hist_field(i, hist_data) {
5088 hist_field = hist_data->fields[i];
5089 if (hist_field->flags & HIST_FIELD_FL_KEY) {
5090 tracing_map_cmp_fn_t cmp_fn;
5091
5092 field = hist_field->field;
5093
69a0200c
TZ		 5094 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
5095 cmp_fn = tracing_map_cmp_none;
ad42febe
TZ		 5096 else if (!field)
5097 cmp_fn = tracing_map_cmp_num(hist_field->size,
5098 hist_field->is_signed);
69a0200c 5099 else if (is_string_field(field))
7ef224d1
TZ		 5100 cmp_fn = tracing_map_cmp_string;
5101 else
5102 cmp_fn = tracing_map_cmp_num(field->size,
5103 field->is_signed);
76a3b0c8
TZ		 5104 idx = tracing_map_add_key_field(map,
5105 hist_field->offset,
5106 cmp_fn);
30350d65 5107 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
7ef224d1
TZ		 5108 idx = tracing_map_add_sum_field(map);
5109
5110 if (idx < 0)
5111 return idx;
30350d65
TZ		 5112
5113 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5114 idx = tracing_map_add_var(map);
5115 if (idx < 0)
5116 return idx;
5117 hist_field->var.idx = idx;
5118 hist_field->var.hist_data = hist_data;
5119 }
7ef224d1
TZ		 5120 }
5121
5122 return 0;
5123}
5124
5125static struct hist_trigger_data *
5126create_hist_data(unsigned int map_bits,
5127 struct hist_trigger_attrs *attrs,
30350d65
TZ		 5128 struct trace_event_file *file,
5129 bool remove)
7ef224d1 5130{
6b4827ad 5131 const struct tracing_map_ops *map_ops = NULL;
7ef224d1
TZ		 5132 struct hist_trigger_data *hist_data;
5133 int ret = 0;
5134
5135 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5136 if (!hist_data)
5137 return ERR_PTR(-ENOMEM);
5138
5139 hist_data->attrs = attrs;
30350d65 5140 hist_data->remove = remove;
067fe038 5141 hist_data->event_file = file;
7ef224d1 5142
0212e2aa
TZ		 5143 ret = parse_actions(hist_data);
5144 if (ret)
5145 goto free;
5146
7ef224d1
TZ		 5147 ret = create_hist_fields(hist_data, file);
5148 if (ret)
5149 goto free;
5150
5151 ret = create_sort_keys(hist_data);
5152 if (ret)
5153 goto free;
5154
af6a29bc 5155 map_ops = &hist_trigger_elt_data_ops;
6b4827ad 5156
7ef224d1 5157 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
6b4827ad 5158 map_ops, hist_data);
7ef224d1
TZ		 5159 if (IS_ERR(hist_data->map)) {
5160 ret = PTR_ERR(hist_data->map);
5161 hist_data->map = NULL;
5162 goto free;
5163 }
5164
5165 ret = create_tracing_map_fields(hist_data);
5166 if (ret)
5167 goto free;
7ef224d1
TZ		 5168 out:
5169 return hist_data;
5170 free:
5171 hist_data->attrs = NULL;
5172
5173 destroy_hist_data(hist_data);
5174
5175 hist_data = ERR_PTR(ret);
5176
5177 goto out;
5178}
5179
5180static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
fbd302cb 5181 struct tracing_map_elt *elt, void *rec,
067fe038
TZ		 5182 struct ring_buffer_event *rbe,
5183 u64 *var_ref_vals)
7ef224d1 5184{
067fe038 5185 struct hist_elt_data *elt_data;
7ef224d1 5186 struct hist_field *hist_field;
30350d65 5187 unsigned int i, var_idx;
7ef224d1
TZ		 5188 u64 hist_val;
5189
067fe038
TZ		 5190 elt_data = elt->private_data;
5191 elt_data->var_ref_vals = var_ref_vals;
5192
7ef224d1
TZ		 5193 for_each_hist_val_field(i, hist_data) {
5194 hist_field = hist_data->fields[i];
df35d93b 5195 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5196 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5197 var_idx = hist_field->var.idx;
5198 tracing_map_set_var(elt, var_idx, hist_val);
5199 continue;
5200 }
7ef224d1
TZ		 5201 tracing_map_update_sum(elt, i, hist_val);
5202 }
30350d65
TZ		 5203
5204 for_each_hist_key_field(i, hist_data) {
5205 hist_field = hist_data->fields[i];
5206 if (hist_field->flags & HIST_FIELD_FL_VAR) {
df35d93b 5207 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5208 var_idx = hist_field->var.idx;
5209 tracing_map_set_var(elt, var_idx, hist_val);
5210 }
5211 }
02205a67
TZ		 5212
5213 update_field_vars(hist_data, elt, rbe, rec);
7ef224d1
TZ		 5214}
5215
6a475cb1
TZ		 5216static inline void add_to_key(char *compound_key, void *key,
5217 struct hist_field *key_field, void *rec)
5218{
5219 size_t size = key_field->size;
5220
5221 if (key_field->flags & HIST_FIELD_FL_STRING) {
5222 struct ftrace_event_field *field;
5223
5224 field = key_field->field;
5225 if (field->filter_type == FILTER_DYN_STRING)
5226 size = *(u32 *)(rec + field->offset) >> 16;
5227 else if (field->filter_type == FILTER_PTR_STRING)
5228 size = strlen(key);
5229 else if (field->filter_type == FILTER_STATIC_STRING)
5230 size = field->size;
5231
5232 /* ensure NULL-termination */
5233 if (size > key_field->size - 1)
5234 size = key_field->size - 1;
6a475cb1 5235
9f0bbf31
TZ		 5236 strncpy(compound_key + key_field->offset, (char *)key, size);
5237 } else
5238 memcpy(compound_key + key_field->offset, key, size);
6a475cb1
TZ		 5239}
5240
0212e2aa
TZ		 5241static void
5242hist_trigger_actions(struct hist_trigger_data *hist_data,
5243 struct tracing_map_elt *elt, void *rec,
7d18a10c
TZ		 5244 struct ring_buffer_event *rbe, void *key,
5245 u64 *var_ref_vals)
0212e2aa
TZ		 5246{
5247 struct action_data *data;
5248 unsigned int i;
5249
5250 for (i = 0; i < hist_data->n_actions; i++) {
5251 data = hist_data->actions[i];
7d18a10c 5252 data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
0212e2aa
TZ		 5253 }
5254}
5255
1ac4f51c 5256static void event_hist_trigger(struct event_trigger_data *data, void *rec,
fbd302cb 5257 struct ring_buffer_event *rbe)
7ef224d1
TZ		 5258{
5259 struct hist_trigger_data *hist_data = data->private_data;
6a475cb1 5260 bool use_compound_key = (hist_data->n_keys > 1);
69a0200c 5261 unsigned long entries[HIST_STACKTRACE_DEPTH];
067fe038 5262 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
76a3b0c8 5263 char compound_key[HIST_KEY_SIZE_MAX];
df35d93b 5264 struct tracing_map_elt *elt = NULL;
7ef224d1 5265 struct hist_field *key_field;
7ef224d1
TZ		 5266 u64 field_contents;
5267 void *key = NULL;
5268 unsigned int i;
5269
6a475cb1 5270 memset(compound_key, 0, hist_data->key_size);
76a3b0c8 5271
7ef224d1
TZ		 5272 for_each_hist_key_field(i, hist_data) {
5273 key_field = hist_data->fields[i];
5274
69a0200c 5275 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
e7d91663
TG		 5276 memset(entries, 0, HIST_STACKTRACE_SIZE);
5277 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
5278 HIST_STACKTRACE_SKIP);
69a0200c
TZ		 5279 key = entries;
5280 } else {
df35d93b 5281 field_contents = key_field->fn(key_field, elt, rbe, rec);
6a475cb1 5282 if (key_field->flags & HIST_FIELD_FL_STRING) {
69a0200c 5283 key = (void *)(unsigned long)field_contents;
6a475cb1
TZ		 5284 use_compound_key = true;
5285 } else
69a0200c 5286 key = (void *)&field_contents;
76a3b0c8 5287 }
6a475cb1
TZ		 5288
5289 if (use_compound_key)
5290 add_to_key(compound_key, key, key_field, rec);
7ef224d1
TZ		 5291 }
5292
6a475cb1 5293 if (use_compound_key)
76a3b0c8
TZ		 5294 key = compound_key;
5295
067fe038
TZ		 5296 if (hist_data->n_var_refs &&
5297 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5298 return;
5299
7ef224d1 5300 elt = tracing_map_insert(hist_data->map, key);
067fe038
TZ		 5301 if (!elt)
5302 return;
5303
5304 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
0212e2aa
TZ		 5305
5306 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
7d18a10c 5307 hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
7ef224d1
TZ		 5308}
5309
69a0200c
TZ		 5310static void hist_trigger_stacktrace_print(struct seq_file *m,
5311 unsigned long *stacktrace_entries,
5312 unsigned int max_entries)
5313{
5314 char str[KSYM_SYMBOL_LEN];
5315 unsigned int spaces = 8;
5316 unsigned int i;
5317
5318 for (i = 0; i < max_entries; i++) {
4285f2fc 5319 if (!stacktrace_entries[i])
69a0200c
TZ		 5320 return;
5321
5322 seq_printf(m, "%*c", 1 + spaces, ' ');
5323 sprint_symbol(str, stacktrace_entries[i]);
5324 seq_printf(m, "%s\n", str);
5325 }
5326}
5327
a3785b7e
TZ		 5328static void hist_trigger_print_key(struct seq_file *m,
5329 struct hist_trigger_data *hist_data,
5330 void *key,
5331 struct tracing_map_elt *elt)
7ef224d1
TZ		 5332{
5333 struct hist_field *key_field;
c6afad49 5334 char str[KSYM_SYMBOL_LEN];
69a0200c 5335 bool multiline = false;
85013256 5336 const char *field_name;
7ef224d1
TZ		 5337 unsigned int i;
5338 u64 uval;
5339
5340 seq_puts(m, "{ ");
5341
5342 for_each_hist_key_field(i, hist_data) {
5343 key_field = hist_data->fields[i];
5344
5345 if (i > hist_data->n_vals)
5346 seq_puts(m, ", ");
5347
85013256
TZ		 5348 field_name = hist_field_name(key_field, 0);
5349
0c4a6b46
TZ		 5350 if (key_field->flags & HIST_FIELD_FL_HEX) {
5351 uval = *(u64 *)(key + key_field->offset);
85013256 5352 seq_printf(m, "%s: %llx", field_name, uval);
c6afad49
TZ		 5353 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5354 uval = *(u64 *)(key + key_field->offset);
5355 sprint_symbol_no_offset(str, uval);
85013256
TZ		 5356 seq_printf(m, "%s: [%llx] %-45s", field_name,
5357 uval, str);
c6afad49
TZ		 5358 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5359 uval = *(u64 *)(key + key_field->offset);
5360 sprint_symbol(str, uval);
85013256
TZ		 5361 seq_printf(m, "%s: [%llx] %-55s", field_name,
5362 uval, str);
6b4827ad 5363 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 5364 struct hist_elt_data *elt_data = elt->private_data;
5365 char *comm;
5366
5367 if (WARN_ON_ONCE(!elt_data))
5368 return;
5369
5370 comm = elt_data->comm;
6b4827ad
TZ		 5371
5372 uval = *(u64 *)(key + key_field->offset);
85013256
TZ		 5373 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5374 comm, uval);
31696198
TZ		 5375 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5376 const char *syscall_name;
5377
5378 uval = *(u64 *)(key + key_field->offset);
5379 syscall_name = get_syscall_name(uval);
5380 if (!syscall_name)
5381 syscall_name = "unknown_syscall";
5382
85013256
TZ		 5383 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5384 syscall_name, uval);
69a0200c
TZ		 5385 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5386 seq_puts(m, "stacktrace:\n");
5387 hist_trigger_stacktrace_print(m,
5388 key + key_field->offset,
5389 HIST_STACKTRACE_DEPTH);
5390 multiline = true;
4b94f5b7 5391 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
85013256 5392 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4b94f5b7 5393 *(u64 *)(key + key_field->offset));
0c4a6b46 5394 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
85013256 5395 seq_printf(m, "%s: %-50s", field_name,
76a3b0c8 5396 (char *)(key + key_field->offset));
7ef224d1 5397 } else {
76a3b0c8 5398 uval = *(u64 *)(key + key_field->offset);
85013256 5399 seq_printf(m, "%s: %10llu", field_name, uval);
7ef224d1
TZ		 5400 }
5401 }
5402
69a0200c
TZ		 5403 if (!multiline)
5404 seq_puts(m, " ");
5405
5406 seq_puts(m, "}");
a3785b7e
TZ		 5407}
5408
5409static void hist_trigger_entry_print(struct seq_file *m,
5410 struct hist_trigger_data *hist_data,
5411 void *key,
5412 struct tracing_map_elt *elt)
5413{
5414 const char *field_name;
5415 unsigned int i;
5416
5417 hist_trigger_print_key(m, hist_data, key, elt);
7ef224d1
TZ		 5418
5419 seq_printf(m, " hitcount: %10llu",
5420 tracing_map_read_sum(elt, HITCOUNT_IDX));
5421
f2606835 5422 for (i = 1; i < hist_data->n_vals; i++) {
85013256
TZ		 5423 field_name = hist_field_name(hist_data->fields[i], 0);
5424
100719dc
TZ		 5425 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
5426 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
30350d65
TZ		 5427 continue;
5428
0c4a6b46 5429 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
85013256 5430 seq_printf(m, " %s: %10llx", field_name,
0c4a6b46
TZ		 5431 tracing_map_read_sum(elt, i));
5432 } else {
85013256 5433 seq_printf(m, " %s: %10llu", field_name,
0c4a6b46
TZ		 5434 tracing_map_read_sum(elt, i));
5435 }
f2606835
TZ		 5436 }
5437
50450603
TZ		 5438 print_actions(m, hist_data, elt);
5439
7ef224d1
TZ		 5440 seq_puts(m, "\n");
5441}
5442
5443static int print_entries(struct seq_file *m,
5444 struct hist_trigger_data *hist_data)
5445{
5446 struct tracing_map_sort_entry **sort_entries = NULL;
5447 struct tracing_map *map = hist_data->map;
d50c744e 5448 int i, n_entries;
7ef224d1
TZ		 5449
5450 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5451 hist_data->n_sort_keys,
5452 &sort_entries);
5453 if (n_entries < 0)
5454 return n_entries;
5455
5456 for (i = 0; i < n_entries; i++)
5457 hist_trigger_entry_print(m, hist_data,
5458 sort_entries[i]->key,
5459 sort_entries[i]->elt);
5460
5461 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5462
5463 return n_entries;
5464}
5465
52a7f16d
TZ		 5466static void hist_trigger_show(struct seq_file *m,
5467 struct event_trigger_data *data, int n)
7ef224d1 5468{
7ef224d1 5469 struct hist_trigger_data *hist_data;
6e7a2398 5470 int n_entries;
7ef224d1 5471
52a7f16d
TZ		 5472 if (n > 0)
5473 seq_puts(m, "\n\n");
7ef224d1
TZ		 5474
5475 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5476 data->ops->print(m, data->ops, data);
52a7f16d 5477 seq_puts(m, "#\n\n");
7ef224d1
TZ		 5478
5479 hist_data = data->private_data;
5480 n_entries = print_entries(m, hist_data);
6e7a2398 5481 if (n_entries < 0)
7ef224d1 5482 n_entries = 0;
7ef224d1 5483
a3785b7e
TZ		 5484 track_data_snapshot_print(m, hist_data);
5485
7ef224d1
TZ		 5486 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5487 (u64)atomic64_read(&hist_data->map->hits),
5488 n_entries, (u64)atomic64_read(&hist_data->map->drops));
52a7f16d
TZ		 5489}
5490
5491static int hist_show(struct seq_file *m, void *v)
5492{
5493 struct event_trigger_data *data;
5494 struct trace_event_file *event_file;
5495 int n = 0, ret = 0;
5496
5497 mutex_lock(&event_mutex);
5498
5499 event_file = event_file_data(m->private);
5500 if (unlikely(!event_file)) {
5501 ret = -ENODEV;
5502 goto out_unlock;
5503 }
5504
5505 list_for_each_entry_rcu(data, &event_file->triggers, list) {
5506 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5507 hist_trigger_show(m, data, n++);
5508 }
5509
7ef224d1
TZ		 5510 out_unlock:
5511 mutex_unlock(&event_mutex);
5512
5513 return ret;
5514}
5515
5516static int event_hist_open(struct inode *inode, struct file *file)
5517{
5518 return single_open(file, hist_show, file);
5519}
5520
5521const struct file_operations event_hist_fops = {
5522 .open = event_hist_open,
5523 .read = seq_read,
5524 .llseek = seq_lseek,
5525 .release = single_release,
5526};
5527
5528static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5529{
85013256
TZ		 5530 const char *field_name = hist_field_name(hist_field, 0);
5531
30350d65
TZ		 5532 if (hist_field->var.name)
5533 seq_printf(m, "%s=", hist_field->var.name);
5534
0ae7961e 5535 if (hist_field->flags & HIST_FIELD_FL_CPU)
8b7622bf 5536 seq_puts(m, "cpu");
067fe038 5537 else if (field_name) {
7e8b88a3
TZ		 5538 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5539 hist_field->flags & HIST_FIELD_FL_ALIAS)
067fe038 5540 seq_putc(m, '$');
ad42febe 5541 seq_printf(m, "%s", field_name);
0ae7961e
TZ		 5542 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5543 seq_puts(m, "common_timestamp");
608940da
TZ		 5544
5545 if (hist_field->flags) {
5546 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5547 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5548 const char *flags = get_hist_field_flags(hist_field);
5549
5550 if (flags)
5551 seq_printf(m, ".%s", flags);
5552 }
5553 }
7ef224d1
TZ		 5554}
5555
5556static int event_hist_trigger_print(struct seq_file *m,
5557 struct event_trigger_ops *ops,
5558 struct event_trigger_data *data)
5559{
5560 struct hist_trigger_data *hist_data = data->private_data;
30350d65
TZ		 5561 struct hist_field *field;
5562 bool have_var = false;
7ef224d1
TZ		 5563 unsigned int i;
5564
5463bfda
TZ		 5565 seq_puts(m, "hist:");
5566
5567 if (data->name)
5568 seq_printf(m, "%s:", data->name);
5569
5570 seq_puts(m, "keys=");
7ef224d1
TZ		 5571
5572 for_each_hist_key_field(i, hist_data) {
30350d65 5573 field = hist_data->fields[i];
7ef224d1
TZ		 5574
5575 if (i > hist_data->n_vals)
5576 seq_puts(m, ",");
5577
30350d65 5578 if (field->flags & HIST_FIELD_FL_STACKTRACE)
69a0200c
TZ		 5579 seq_puts(m, "stacktrace");
5580 else
30350d65 5581 hist_field_print(m, field);
7ef224d1
TZ		 5582 }
5583
5584 seq_puts(m, ":vals=");
f2606835
TZ		 5585
5586 for_each_hist_val_field(i, hist_data) {
30350d65
TZ		 5587 field = hist_data->fields[i];
5588 if (field->flags & HIST_FIELD_FL_VAR) {
5589 have_var = true;
5590 continue;
5591 }
5592
f2606835
TZ		 5593 if (i == HITCOUNT_IDX)
5594 seq_puts(m, "hitcount");
5595 else {
5596 seq_puts(m, ",");
30350d65
TZ		 5597 hist_field_print(m, field);
5598 }
5599 }
5600
5601 if (have_var) {
5602 unsigned int n = 0;
5603
5604 seq_puts(m, ":");
5605
5606 for_each_hist_val_field(i, hist_data) {
5607 field = hist_data->fields[i];
5608
5609 if (field->flags & HIST_FIELD_FL_VAR) {
5610 if (n++)
5611 seq_puts(m, ",");
5612 hist_field_print(m, field);
5613 }
f2606835
TZ		 5614 }
5615 }
7ef224d1
TZ		 5616
5617 seq_puts(m, ":sort=");
e62347d2
TZ		 5618
5619 for (i = 0; i < hist_data->n_sort_keys; i++) {
5620 struct tracing_map_sort_key *sort_key;
30350d65
TZ		 5621 unsigned int idx, first_key_idx;
5622
5623 /* skip VAR vals */
5624 first_key_idx = hist_data->n_vals - hist_data->n_vars;
e62347d2
TZ		 5625
5626 sort_key = &hist_data->sort_keys[i];
ad42febe
TZ		 5627 idx = sort_key->field_idx;
5628
1a361dfc 5629 if (WARN_ON(idx >= HIST_FIELDS_MAX))
ad42febe 5630 return -EINVAL;
e62347d2
TZ		 5631
5632 if (i > 0)
5633 seq_puts(m, ",");
5634
ad42febe 5635 if (idx == HITCOUNT_IDX)
e62347d2 5636 seq_puts(m, "hitcount");
30350d65
TZ		 5637 else {
5638 if (idx >= first_key_idx)
5639 idx += hist_data->n_vars;
e62347d2 5640 hist_field_print(m, hist_data->fields[idx]);
30350d65 5641 }
e62347d2
TZ		 5642
5643 if (sort_key->descending)
5644 seq_puts(m, ".descending");
5645 }
7ef224d1 5646 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
a4072fe8
TZ		 5647 if (hist_data->enable_timestamps)
5648 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
7ef224d1 5649
c282a386
TZ		 5650 print_actions_spec(m, hist_data);
5651
7ef224d1
TZ		 5652 if (data->filter_str)
5653 seq_printf(m, " if %s", data->filter_str);
5654
83e99914
TZ		 5655 if (data->paused)
5656 seq_puts(m, " [paused]");
5657 else
5658 seq_puts(m, " [active]");
7ef224d1
TZ		 5659
5660 seq_putc(m, '\n');
5661
5662 return 0;
5663}
5664
5463bfda
TZ		 5665static int event_hist_trigger_init(struct event_trigger_ops *ops,
5666 struct event_trigger_data *data)
5667{
5668 struct hist_trigger_data *hist_data = data->private_data;
5669
5670 if (!data->ref && hist_data->attrs->name)
5671 save_named_trigger(hist_data->attrs->name, data);
5672
5673 data->ref++;
5674
5675 return 0;
5676}
5677
02205a67
TZ		 5678static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5679{
5680 struct trace_event_file *file;
5681 unsigned int i;
5682 char *cmd;
5683 int ret;
5684
5685 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5686 file = hist_data->field_var_hists[i]->hist_data->event_file;
5687 cmd = hist_data->field_var_hists[i]->cmd;
5688 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5689 "!hist", "hist", cmd);
5690 }
5691}
5692
7ef224d1
TZ		 5693static void event_hist_trigger_free(struct event_trigger_ops *ops,
5694 struct event_trigger_data *data)
5695{
5696 struct hist_trigger_data *hist_data = data->private_data;
5697
5698 if (WARN_ON_ONCE(data->ref <= 0))
5699 return;
5700
5701 data->ref--;
5702 if (!data->ref) {
5463bfda
TZ		 5703 if (data->name)
5704 del_named_trigger(data);
067fe038 5705
7ef224d1 5706 trigger_data_free(data);
067fe038
TZ		 5707
5708 remove_hist_vars(hist_data);
5709
02205a67
TZ		 5710 unregister_field_var_hists(hist_data);
5711
7ef224d1
TZ		 5712 destroy_hist_data(hist_data);
5713 }
5714}
5715
5716static struct event_trigger_ops event_hist_trigger_ops = {
5717 .func = event_hist_trigger,
5718 .print = event_hist_trigger_print,
5463bfda 5719 .init = event_hist_trigger_init,
7ef224d1
TZ		 5720 .free = event_hist_trigger_free,
5721};
5722
5463bfda
TZ		 5723static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5724 struct event_trigger_data *data)
5725{
5726 data->ref++;
5727
5728 save_named_trigger(data->named_data->name, data);
5729
5730 event_hist_trigger_init(ops, data->named_data);
5731
5732 return 0;
5733}
5734
5735static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5736 struct event_trigger_data *data)
5737{
5738 if (WARN_ON_ONCE(data->ref <= 0))
5739 return;
5740
5741 event_hist_trigger_free(ops, data->named_data);
5742
5743 data->ref--;
5744 if (!data->ref) {
5745 del_named_trigger(data);
5746 trigger_data_free(data);
5747 }
5748}
5749
5750static struct event_trigger_ops event_hist_trigger_named_ops = {
5751 .func = event_hist_trigger,
5752 .print = event_hist_trigger_print,
5753 .init = event_hist_trigger_named_init,
5754 .free = event_hist_trigger_named_free,
5755};
5756
7ef224d1
TZ		 5757static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5758 char *param)
5759{
5760 return &event_hist_trigger_ops;
5761}
5762
e86ae9ba
TZ		 5763static void hist_clear(struct event_trigger_data *data)
5764{
5765 struct hist_trigger_data *hist_data = data->private_data;
e86ae9ba 5766
5463bfda
TZ		 5767 if (data->name)
5768 pause_named_trigger(data);
e86ae9ba 5769
e0a568dc 5770 tracepoint_synchronize_unregister();
e86ae9ba
TZ		 5771
5772 tracing_map_clear(hist_data->map);
5773
5463bfda
TZ		 5774 if (data->name)
5775 unpause_named_trigger(data);
5776}
5777
5778static bool compatible_field(struct ftrace_event_field *field,
5779 struct ftrace_event_field *test_field)
5780{
5781 if (field == test_field)
5782 return true;
5783 if (field == NULL || test_field == NULL)
5784 return false;
5785 if (strcmp(field->name, test_field->name) != 0)
5786 return false;
5787 if (strcmp(field->type, test_field->type) != 0)
5788 return false;
5789 if (field->size != test_field->size)
5790 return false;
5791 if (field->is_signed != test_field->is_signed)
5792 return false;
5793
5794 return true;
e86ae9ba
TZ		 5795}
5796
52a7f16d 5797static bool hist_trigger_match(struct event_trigger_data *data,
5463bfda
TZ		 5798 struct event_trigger_data *data_test,
5799 struct event_trigger_data *named_data,
5800 bool ignore_filter)
52a7f16d
TZ		 5801{
5802 struct tracing_map_sort_key *sort_key, *sort_key_test;
5803 struct hist_trigger_data *hist_data, *hist_data_test;
5804 struct hist_field *key_field, *key_field_test;
5805 unsigned int i;
5806
5463bfda
TZ		 5807 if (named_data && (named_data != data_test) &&
5808 (named_data != data_test->named_data))
5809 return false;
5810
5811 if (!named_data && is_named_trigger(data_test))
5812 return false;
5813
52a7f16d
TZ		 5814 hist_data = data->private_data;
5815 hist_data_test = data_test->private_data;
5816
5817 if (hist_data->n_vals != hist_data_test->n_vals ||
5818 hist_data->n_fields != hist_data_test->n_fields ||
5819 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5820 return false;
5821
5463bfda
TZ		 5822 if (!ignore_filter) {
5823 if ((data->filter_str && !data_test->filter_str) ||
5824 (!data->filter_str && data_test->filter_str))
5825 return false;
5826 }
52a7f16d
TZ		 5827
5828 for_each_hist_field(i, hist_data) {
5829 key_field = hist_data->fields[i];
5830 key_field_test = hist_data_test->fields[i];
5831
5832 if (key_field->flags != key_field_test->flags)
5833 return false;
5463bfda 5834 if (!compatible_field(key_field->field, key_field_test->field))
52a7f16d
TZ		 5835 return false;
5836 if (key_field->offset != key_field_test->offset)
5837 return false;
ad42febe
TZ		 5838 if (key_field->size != key_field_test->size)
5839 return false;
5840 if (key_field->is_signed != key_field_test->is_signed)
5841 return false;
1a361dfc
TZ		 5842 if (!!key_field->var.name != !!key_field_test->var.name)
5843 return false;
5844 if (key_field->var.name &&
5845 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5846 return false;
52a7f16d
TZ		 5847 }
5848
5849 for (i = 0; i < hist_data->n_sort_keys; i++) {
5850 sort_key = &hist_data->sort_keys[i];
5851 sort_key_test = &hist_data_test->sort_keys[i];
5852
5853 if (sort_key->field_idx != sort_key_test->field_idx ||
5854 sort_key->descending != sort_key_test->descending)
5855 return false;
5856 }
5857
5463bfda 5858 if (!ignore_filter && data->filter_str &&
52a7f16d
TZ		 5859 (strcmp(data->filter_str, data_test->filter_str) != 0))
5860 return false;
5861
48f79473
TZ		 5862 if (!actions_match(hist_data, hist_data_test))
5863 return false;
5864
52a7f16d
TZ		 5865 return true;
5866}
5867
7ef224d1
TZ		 5868static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5869 struct event_trigger_data *data,
5870 struct trace_event_file *file)
5871{
83e99914 5872 struct hist_trigger_data *hist_data = data->private_data;
5463bfda 5873 struct event_trigger_data *test, *named_data = NULL;
d0cd871b 5874 struct trace_array *tr = file->tr;
7ef224d1
TZ		 5875 int ret = 0;
5876
5463bfda
TZ		 5877 if (hist_data->attrs->name) {
5878 named_data = find_named_trigger(hist_data->attrs->name);
5879 if (named_data) {
5880 if (!hist_trigger_match(data, named_data, named_data,
5881 true)) {
d0cd871b 5882 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5463bfda
TZ		 5883 ret = -EINVAL;
5884 goto out;
5885 }
5886 }
5887 }
5888
5889 if (hist_data->attrs->name && !named_data)
5890 goto new;
5891
7ef224d1
TZ		 5892 list_for_each_entry_rcu(test, &file->triggers, list) {
5893 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 5894 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d 5895 continue;
83e99914
TZ		 5896 if (hist_data->attrs->pause)
5897 test->paused = true;
5898 else if (hist_data->attrs->cont)
5899 test->paused = false;
e86ae9ba
TZ		 5900 else if (hist_data->attrs->clear)
5901 hist_clear(test);
f404da6e 5902 else {
d0cd871b 5903 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
83e99914 5904 ret = -EEXIST;
f404da6e 5905 }
7ef224d1
TZ		 5906 goto out;
5907 }
5908 }
5463bfda 5909 new:
e86ae9ba 5910 if (hist_data->attrs->cont || hist_data->attrs->clear) {
d0cd871b 5911 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
83e99914
TZ		 5912 ret = -ENOENT;
5913 goto out;
5914 }
5915
7522c03a
TZ		 5916 if (hist_data->attrs->pause)
5917 data->paused = true;
5918
5463bfda 5919 if (named_data) {
5463bfda
TZ		 5920 data->private_data = named_data->private_data;
5921 set_named_trigger_data(data, named_data);
5922 data->ops = &event_hist_trigger_named_ops;
5923 }
5924
7ef224d1
TZ		 5925 if (data->ops->init) {
5926 ret = data->ops->init(data->ops, data);
5927 if (ret < 0)
5928 goto out;
5929 }
5930
a4072fe8
TZ		 5931 if (hist_data->enable_timestamps) {
5932 char *clock = hist_data->attrs->clock;
5933
5934 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5935 if (ret) {
d0cd871b 5936 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
a4072fe8
TZ		 5937 goto out;
5938 }
7ef224d1 5939
ad42febe 5940 tracing_set_time_stamp_abs(file->tr, true);
a4072fe8
TZ		 5941 }
5942
5943 if (named_data)
5944 destroy_hist_data(hist_data);
5945
5946 ret++;
067fe038
TZ		 5947 out:
5948 return ret;
5949}
5950
5951static int hist_trigger_enable(struct event_trigger_data *data,
5952 struct trace_event_file *file)
5953{
5954 int ret = 0;
5955
5956 list_add_tail_rcu(&data->list, &file->triggers);
5957
5958 update_cond_flag(file);
ad42febe 5959
7ef224d1
TZ		 5960 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5961 list_del_rcu(&data->list);
5962 update_cond_flag(file);
5963 ret--;
5964 }
067fe038 5965
7ef224d1
TZ		 5966 return ret;
5967}
5968
4b147936
TZ		 5969static bool have_hist_trigger_match(struct event_trigger_data *data,
5970 struct trace_event_file *file)
5971{
5972 struct hist_trigger_data *hist_data = data->private_data;
5973 struct event_trigger_data *test, *named_data = NULL;
5974 bool match = false;
5975
5976 if (hist_data->attrs->name)
5977 named_data = find_named_trigger(hist_data->attrs->name);
5978
5979 list_for_each_entry_rcu(test, &file->triggers, list) {
5980 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5981 if (hist_trigger_match(data, test, named_data, false)) {
5982 match = true;
5983 break;
5984 }
5985 }
5986 }
5987
5988 return match;
5989}
5990
067fe038
TZ		 5991static bool hist_trigger_check_refs(struct event_trigger_data *data,
5992 struct trace_event_file *file)
5993{
5994 struct hist_trigger_data *hist_data = data->private_data;
5995 struct event_trigger_data *test, *named_data = NULL;
5996
5997 if (hist_data->attrs->name)
5998 named_data = find_named_trigger(hist_data->attrs->name);
5999
6000 list_for_each_entry_rcu(test, &file->triggers, list) {
6001 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6002 if (!hist_trigger_match(data, test, named_data, false))
6003 continue;
6004 hist_data = test->private_data;
6005 if (check_var_refs(hist_data))
6006 return true;
6007 break;
6008 }
6009 }
6010
6011 return false;
6012}
6013
52a7f16d
TZ		 6014static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
6015 struct event_trigger_data *data,
6016 struct trace_event_file *file)
6017{
5463bfda
TZ		 6018 struct hist_trigger_data *hist_data = data->private_data;
6019 struct event_trigger_data *test, *named_data = NULL;
52a7f16d
TZ		 6020 bool unregistered = false;
6021
5463bfda
TZ		 6022 if (hist_data->attrs->name)
6023 named_data = find_named_trigger(hist_data->attrs->name);
6024
52a7f16d
TZ		 6025 list_for_each_entry_rcu(test, &file->triggers, list) {
6026 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 6027 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d
TZ		 6028 continue;
6029 unregistered = true;
6030 list_del_rcu(&test->list);
6031 trace_event_trigger_enable_disable(file, 0);
6032 update_cond_flag(file);
6033 break;
6034 }
6035 }
6036
6037 if (unregistered && test->ops->free)
6038 test->ops->free(test->ops, test);
ad42febe
TZ		 6039
6040 if (hist_data->enable_timestamps) {
30350d65 6041 if (!hist_data->remove || unregistered)
ad42febe
TZ		 6042 tracing_set_time_stamp_abs(file->tr, false);
6043 }
52a7f16d
TZ		 6044}
6045
067fe038
TZ		 6046static bool hist_file_check_refs(struct trace_event_file *file)
6047{
6048 struct hist_trigger_data *hist_data;
6049 struct event_trigger_data *test;
6050
6051 list_for_each_entry_rcu(test, &file->triggers, list) {
6052 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6053 hist_data = test->private_data;
6054 if (check_var_refs(hist_data))
6055 return true;
6056 }
6057 }
6058
6059 return false;
6060}
6061
52a7f16d
TZ		 6062static void hist_unreg_all(struct trace_event_file *file)
6063{
47c18569 6064 struct event_trigger_data *test, *n;
ad42febe 6065 struct hist_trigger_data *hist_data;
4b147936
TZ		 6066 struct synth_event *se;
6067 const char *se_name;
52a7f16d 6068
0e2b81f7
MH		 6069 lockdep_assert_held(&event_mutex);
6070
067fe038
TZ		 6071 if (hist_file_check_refs(file))
6072 return;
6073
47c18569 6074 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d 6075 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
ad42febe 6076 hist_data = test->private_data;
52a7f16d
TZ		 6077 list_del_rcu(&test->list);
6078 trace_event_trigger_enable_disable(file, 0);
4b147936 6079
4b147936
TZ		 6080 se_name = trace_event_name(file->event_call);
6081 se = find_synth_event(se_name);
6082 if (se)
6083 se->ref--;
4b147936 6084
52a7f16d 6085 update_cond_flag(file);
ad42febe
TZ		 6086 if (hist_data->enable_timestamps)
6087 tracing_set_time_stamp_abs(file->tr, false);
52a7f16d
TZ		 6088 if (test->ops->free)
6089 test->ops->free(test->ops, test);
6090 }
6091 }
6092}
6093
7ef224d1
TZ		 6094static int event_hist_trigger_func(struct event_command *cmd_ops,
6095 struct trace_event_file *file,
6096 char *glob, char *cmd, char *param)
6097{
6098 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6099 struct event_trigger_data *trigger_data;
6100 struct hist_trigger_attrs *attrs;
6101 struct event_trigger_ops *trigger_ops;
6102 struct hist_trigger_data *hist_data;
4b147936
TZ		 6103 struct synth_event *se;
6104 const char *se_name;
30350d65 6105 bool remove = false;
ec5ce098 6106 char *trigger, *p;
7ef224d1
TZ		 6107 int ret = 0;
6108
0e2b81f7
MH		 6109 lockdep_assert_held(&event_mutex);
6110
f404da6e 6111 if (glob && strlen(glob)) {
f404da6e 6112 hist_err_clear();
a1a05bb4 6113 last_cmd_set(file, param);
f404da6e
TZ		 6114 }
6115
7ef224d1
TZ		 6116 if (!param)
6117 return -EINVAL;
6118
30350d65
TZ		 6119 if (glob[0] == '!')
6120 remove = true;
6121
ec5ce098
TZ		 6122 /*
6123 * separate the trigger from the filter (k:v [if filter])
6124 * allowing for whitespace in the trigger
6125 */
6126 p = trigger = param;
6127 do {
6128 p = strstr(p, "if");
6129 if (!p)
6130 break;
6131 if (p == param)
6132 return -EINVAL;
6133 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6134 p++;
6135 continue;
6136 }
2f31ed93 6137 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
ec5ce098 6138 return -EINVAL;
2f31ed93 6139 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
ec5ce098
TZ		 6140 p++;
6141 continue;
6142 }
6143 break;
6144 } while (p);
6145
6146 if (!p)
6147 param = NULL;
6148 else {
6149 *(p - 1) = '\0';
6150 param = strstrip(p);
6151 trigger = strstrip(trigger);
6152 }
7ef224d1 6153
d0cd871b 6154 attrs = parse_hist_trigger_attrs(file->tr, trigger);
7ef224d1
TZ		 6155 if (IS_ERR(attrs))
6156 return PTR_ERR(attrs);
6157
6158 if (attrs->map_bits)
6159 hist_trigger_bits = attrs->map_bits;
6160
30350d65 6161 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
7ef224d1
TZ		 6162 if (IS_ERR(hist_data)) {
6163 destroy_hist_trigger_attrs(attrs);
6164 return PTR_ERR(hist_data);
6165 }
6166
6167 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
6168
7ef224d1 6169 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
4b147936
TZ		 6170 if (!trigger_data) {
6171 ret = -ENOMEM;
7ef224d1 6172 goto out_free;
4b147936 6173 }
7ef224d1
TZ		 6174
6175 trigger_data->count = -1;
6176 trigger_data->ops = trigger_ops;
6177 trigger_data->cmd_ops = cmd_ops;
6178
6179 INIT_LIST_HEAD(&trigger_data->list);
6180 RCU_INIT_POINTER(trigger_data->filter, NULL);
6181
6182 trigger_data->private_data = hist_data;
6183
52a7f16d
TZ		 6184 /* if param is non-empty, it's supposed to be a filter */
6185 if (param && cmd_ops->set_filter) {
6186 ret = cmd_ops->set_filter(param, trigger_data, file);
6187 if (ret < 0)
6188 goto out_free;
6189 }
6190
30350d65 6191 if (remove) {
4b147936
TZ		 6192 if (!have_hist_trigger_match(trigger_data, file))
6193 goto out_free;
6194
067fe038
TZ		 6195 if (hist_trigger_check_refs(trigger_data, file)) {
6196 ret = -EBUSY;
6197 goto out_free;
6198 }
6199
7ef224d1 6200 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
4b147936
TZ		 6201 se_name = trace_event_name(file->event_call);
6202 se = find_synth_event(se_name);
6203 if (se)
6204 se->ref--;
7ef224d1
TZ		 6205 ret = 0;
6206 goto out_free;
6207 }
6208
7ef224d1
TZ		 6209 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
6210 /*
6211 * The above returns on success the # of triggers registered,
6212 * but if it didn't register any it returns zero. Consider no
6213 * triggers registered a failure too.
6214 */
6215 if (!ret) {
e86ae9ba 6216 if (!(attrs->pause || attrs->cont || attrs->clear))
83e99914 6217 ret = -ENOENT;
7ef224d1
TZ		 6218 goto out_free;
6219 } else if (ret < 0)
6220 goto out_free;
067fe038
TZ		 6221
6222 if (get_named_trigger_data(trigger_data))
6223 goto enable;
6224
6225 if (has_hist_vars(hist_data))
6226 save_hist_vars(hist_data);
6227
7d18a10c 6228 ret = create_actions(hist_data);
0212e2aa
TZ		 6229 if (ret)
6230 goto out_unreg;
6231
067fe038
TZ		 6232 ret = tracing_map_init(hist_data->map);
6233 if (ret)
6234 goto out_unreg;
6235enable:
6236 ret = hist_trigger_enable(trigger_data, file);
6237 if (ret)
6238 goto out_unreg;
6239
4b147936
TZ		 6240 se_name = trace_event_name(file->event_call);
6241 se = find_synth_event(se_name);
6242 if (se)
6243 se->ref++;
7ef224d1
TZ		 6244 /* Just return zero, not the number of registered triggers */
6245 ret = 0;
6246 out:
f404da6e
TZ		 6247 if (ret == 0)
6248 hist_err_clear();
6249
7ef224d1 6250 return ret;
067fe038
TZ		 6251 out_unreg:
6252 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
7ef224d1
TZ		 6253 out_free:
6254 if (cmd_ops->set_filter)
6255 cmd_ops->set_filter(NULL, trigger_data, NULL);
6256
067fe038
TZ		 6257 remove_hist_vars(hist_data);
6258
7ef224d1
TZ		 6259 kfree(trigger_data);
6260
6261 destroy_hist_data(hist_data);
6262 goto out;
6263}
6264
6265static struct event_command trigger_hist_cmd = {
6266 .name = "hist",
6267 .trigger_type = ETT_EVENT_HIST,
6268 .flags = EVENT_CMD_FL_NEEDS_REC,
6269 .func = event_hist_trigger_func,
6270 .reg = hist_register_trigger,
52a7f16d
TZ		 6271 .unreg = hist_unregister_trigger,
6272 .unreg_all = hist_unreg_all,
7ef224d1
TZ		 6273 .get_trigger_ops = event_hist_get_trigger_ops,
6274 .set_filter = set_trigger_filter,
6275};
6276
6277__init int register_trigger_hist_cmd(void)
6278{
6279 int ret;
6280
6281 ret = register_event_command(&trigger_hist_cmd);
6282 WARN_ON(ret < 0);
6283
6284 return ret;
6285}
d0bad49b
TZ		 6286
6287static void
1ac4f51c
TZ		 6288hist_enable_trigger(struct event_trigger_data *data, void *rec,
6289 struct ring_buffer_event *event)
d0bad49b
TZ		 6290{
6291 struct enable_trigger_data *enable_data = data->private_data;
6292 struct event_trigger_data *test;
6293
6294 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
6295 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6296 if (enable_data->enable)
6297 test->paused = false;
6298 else
6299 test->paused = true;
d0bad49b
TZ		 6300 }
6301 }
6302}
6303
6304static void
1ac4f51c
TZ		 6305hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
6306 struct ring_buffer_event *event)
d0bad49b
TZ		 6307{
6308 if (!data->count)
6309 return;
6310
6311 if (data->count != -1)
6312 (data->count)--;
6313
1ac4f51c 6314 hist_enable_trigger(data, rec, event);
d0bad49b
TZ		 6315}
6316
6317static struct event_trigger_ops hist_enable_trigger_ops = {
6318 .func = hist_enable_trigger,
6319 .print = event_enable_trigger_print,
6320 .init = event_trigger_init,
6321 .free = event_enable_trigger_free,
6322};
6323
6324static struct event_trigger_ops hist_enable_count_trigger_ops = {
6325 .func = hist_enable_count_trigger,
6326 .print = event_enable_trigger_print,
6327 .init = event_trigger_init,
6328 .free = event_enable_trigger_free,
6329};
6330
6331static struct event_trigger_ops hist_disable_trigger_ops = {
6332 .func = hist_enable_trigger,
6333 .print = event_enable_trigger_print,
6334 .init = event_trigger_init,
6335 .free = event_enable_trigger_free,
6336};
6337
6338static struct event_trigger_ops hist_disable_count_trigger_ops = {
6339 .func = hist_enable_count_trigger,
6340 .print = event_enable_trigger_print,
6341 .init = event_trigger_init,
6342 .free = event_enable_trigger_free,
6343};
6344
6345static struct event_trigger_ops *
6346hist_enable_get_trigger_ops(char *cmd, char *param)
6347{
6348 struct event_trigger_ops *ops;
6349 bool enable;
6350
6351 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6352
6353 if (enable)
6354 ops = param ? &hist_enable_count_trigger_ops :
6355 &hist_enable_trigger_ops;
6356 else
6357 ops = param ? &hist_disable_count_trigger_ops :
6358 &hist_disable_trigger_ops;
6359
6360 return ops;
6361}
6362
52a7f16d
TZ		 6363static void hist_enable_unreg_all(struct trace_event_file *file)
6364{
47c18569 6365 struct event_trigger_data *test, *n;
52a7f16d 6366
47c18569 6367 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d
TZ		 6368 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6369 list_del_rcu(&test->list);
6370 update_cond_flag(file);
6371 trace_event_trigger_enable_disable(file, 0);
6372 if (test->ops->free)
6373 test->ops->free(test->ops, test);
6374 }
6375 }
6376}
6377
d0bad49b
TZ		 6378static struct event_command trigger_hist_enable_cmd = {
6379 .name = ENABLE_HIST_STR,
6380 .trigger_type = ETT_HIST_ENABLE,
6381 .func = event_enable_trigger_func,
6382 .reg = event_enable_register_trigger,
6383 .unreg = event_enable_unregister_trigger,
52a7f16d 6384 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6385 .get_trigger_ops = hist_enable_get_trigger_ops,
6386 .set_filter = set_trigger_filter,
6387};
6388
6389static struct event_command trigger_hist_disable_cmd = {
6390 .name = DISABLE_HIST_STR,
6391 .trigger_type = ETT_HIST_ENABLE,
6392 .func = event_enable_trigger_func,
6393 .reg = event_enable_register_trigger,
6394 .unreg = event_enable_unregister_trigger,
52a7f16d 6395 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6396 .get_trigger_ops = hist_enable_get_trigger_ops,
6397 .set_filter = set_trigger_filter,
6398};
6399
6400static __init void unregister_trigger_hist_enable_disable_cmds(void)
6401{
6402 unregister_event_command(&trigger_hist_enable_cmd);
6403 unregister_event_command(&trigger_hist_disable_cmd);
6404}
6405
6406__init int register_trigger_hist_enable_disable_cmds(void)
6407{
6408 int ret;
6409
6410 ret = register_event_command(&trigger_hist_enable_cmd);
6411 if (WARN_ON(ret < 0))
6412 return ret;
6413 ret = register_event_command(&trigger_hist_disable_cmd);
6414 if (WARN_ON(ret < 0))
6415 unregister_trigger_hist_enable_disable_cmds();
6416
6417 return ret;
6418}
4b147936
TZ		 6419
6420static __init int trace_events_hist_init(void)
6421{
6422 struct dentry *entry = NULL;
6423 struct dentry *d_tracer;
6424 int err = 0;
6425
7bbab38d
MH		 6426 err = dyn_event_register(&synth_event_ops);
6427 if (err) {
6428 pr_warn("Could not register synth_event_ops\n");
6429 return err;
6430 }
6431
4b147936
TZ		 6432 d_tracer = tracing_init_dentry();
6433 if (IS_ERR(d_tracer)) {
6434 err = PTR_ERR(d_tracer);
6435 goto err;
6436 }
6437
6438 entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
6439 NULL, &synth_events_fops);
6440 if (!entry) {
6441 err = -ENODEV;
6442 goto err;
6443 }
6444
6445 return err;
6446 err:
6447 pr_warn("Could not create tracefs 'synthetic_events' entry\n");
6448
6449 return err;
6450}
6451
6452fs_initcall(trace_events_hist_init);
Linux 6.x block layer and io_uring tree(s)