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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / kernel / trace / trace_events_hist.c
CommitLineData
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>
17911ff3 10#include <linux/security.h>
7ef224d1
TZ		 11#include <linux/mutex.h>
12#include <linux/slab.h>
13#include <linux/stacktrace.h>
b2d09103 14#include <linux/rculist.h>
4b147936 15#include <linux/tracefs.h>
7ef224d1 16
ac681546
ZX		 17/* for gfp flag names */
18#include <linux/trace_events.h>
19#include <trace/events/mmflags.h>
20
7ef224d1
TZ		 21#include "tracing_map.h"
22#include "trace.h"
7bbab38d 23#include "trace_dynevent.h"
7ef224d1 24
4b147936
TZ		 25#define SYNTH_SYSTEM "synthetic"
26#define SYNTH_FIELDS_MAX 16
27
28#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
29
d566c5e9
TZ		 30#define ERRORS \
31 C(NONE, "No error"), \
32 C(DUPLICATE_VAR, "Variable already defined"), \
33 C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
34 C(TOO_MANY_VARS, "Too many variables defined"), \
35 C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
36 C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
37 C(TRIGGER_EEXIST, "Hist trigger already exists"), \
38 C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
39 C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
40 C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
41 C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
42 C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
43 C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
44 C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
45 C(HIST_NOT_FOUND, "Matching event histogram not found"), \
46 C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
47 C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
48 C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
49 C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
50 C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
51 C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
52 C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
53 C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
54 C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
55 C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
56 C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
57 C(TOO_MANY_PARAMS, "Too many action params"), \
58 C(PARAM_NOT_FOUND, "Couldn't find param"), \
59 C(INVALID_PARAM, "Invalid action param"), \
60 C(ACTION_NOT_FOUND, "No action found"), \
61 C(NO_SAVE_PARAMS, "No params found for save()"), \
62 C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
63 C(ACTION_MISMATCH, "Handler doesn't support action"), \
64 C(NO_CLOSING_PAREN, "No closing paren found"), \
65 C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
66 C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
c8d94a18 67 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
d566c5e9
TZ		 68 C(VAR_NOT_FOUND, "Couldn't find variable"), \
69 C(FIELD_NOT_FOUND, "Couldn't find field"),
70
71#undef C
72#define C(a, b) HIST_ERR_##a
73
74enum { ERRORS };
75
76#undef C
77#define C(a, b) b
78
79static const char *err_text[] = { ERRORS };
80
7ef224d1
TZ		 81struct hist_field;
82
df35d93b
TZ		 83typedef u64 (*hist_field_fn_t) (struct hist_field *field,
84 struct tracing_map_elt *elt,
85 struct ring_buffer_event *rbe,
86 void *event);
7ef224d1 87
5819eadd 88#define HIST_FIELD_OPERANDS_MAX 2
30350d65 89#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
0212e2aa 90#define HIST_ACTIONS_MAX 8
30350d65 91
100719dc
TZ		 92enum field_op_id {
93 FIELD_OP_NONE,
94 FIELD_OP_PLUS,
95 FIELD_OP_MINUS,
96 FIELD_OP_UNARY_MINUS,
97};
98
05ddb25c
TZ		 99/*
100 * A hist_var (histogram variable) contains variable information for
101 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
102 * flag set. A hist_var has a variable name e.g. ts0, and is
103 * associated with a given histogram trigger, as specified by
104 * hist_data. The hist_var idx is the unique index assigned to the
105 * variable by the hist trigger's tracing_map. The idx is what is
106 * used to set a variable's value and, by a variable reference, to
107 * retrieve it.
108 */
30350d65
TZ		 109struct hist_var {
110 char *name;
111 struct hist_trigger_data *hist_data;
112 unsigned int idx;
113};
5819eadd 114
7ef224d1
TZ		 115struct hist_field {
116 struct ftrace_event_field *field;
117 unsigned long flags;
118 hist_field_fn_t fn;
119 unsigned int size;
76a3b0c8 120 unsigned int offset;
5819eadd 121 unsigned int is_signed;
19a9facd 122 const char *type;
5819eadd 123 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
b559d003 124 struct hist_trigger_data *hist_data;
05ddb25c
TZ		 125
126 /*
127 * Variable fields contain variable-specific info in var.
128 */
30350d65 129 struct hist_var var;
100719dc 130 enum field_op_id operator;
067fe038
TZ		 131 char *system;
132 char *event_name;
05ddb25c
TZ		 133
134 /*
135 * The name field is used for EXPR and VAR_REF fields. VAR
136 * fields contain the variable name in var.name.
137 */
100719dc 138 char *name;
05ddb25c
TZ		 139
140 /*
141 * When a histogram trigger is hit, if it has any references
142 * to variables, the values of those variables are collected
143 * into a var_ref_vals array by resolve_var_refs(). The
144 * current value of each variable is read from the tracing_map
145 * using the hist field's hist_var.idx and entered into the
146 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
147 */
067fe038
TZ		 148 unsigned int var_ref_idx;
149 bool read_once;
7ef224d1
TZ		 150};
151
df35d93b
TZ		 152static u64 hist_field_none(struct hist_field *field,
153 struct tracing_map_elt *elt,
154 struct ring_buffer_event *rbe,
155 void *event)
69a0200c
TZ		 156{
157 return 0;
158}
159
df35d93b
TZ		 160static u64 hist_field_counter(struct hist_field *field,
161 struct tracing_map_elt *elt,
162 struct ring_buffer_event *rbe,
163 void *event)
7ef224d1
TZ		 164{
165 return 1;
166}
167
df35d93b
TZ		 168static u64 hist_field_string(struct hist_field *hist_field,
169 struct tracing_map_elt *elt,
170 struct ring_buffer_event *rbe,
171 void *event)
7ef224d1
TZ		 172{
173 char *addr = (char *)(event + hist_field->field->offset);
174
175 return (u64)(unsigned long)addr;
176}
177
df35d93b
TZ		 178static u64 hist_field_dynstring(struct hist_field *hist_field,
179 struct tracing_map_elt *elt,
180 struct ring_buffer_event *rbe,
181 void *event)
79e577cb
NK		 182{
183 u32 str_item = *(u32 *)(event + hist_field->field->offset);
184 int str_loc = str_item & 0xffff;
185 char *addr = (char *)(event + str_loc);
186
187 return (u64)(unsigned long)addr;
188}
189
df35d93b
TZ		 190static u64 hist_field_pstring(struct hist_field *hist_field,
191 struct tracing_map_elt *elt,
192 struct ring_buffer_event *rbe,
193 void *event)
79e577cb
NK		 194{
195 char **addr = (char **)(event + hist_field->field->offset);
196
197 return (u64)(unsigned long)*addr;
198}
199
df35d93b
TZ		 200static u64 hist_field_log2(struct hist_field *hist_field,
201 struct tracing_map_elt *elt,
202 struct ring_buffer_event *rbe,
203 void *event)
4b94f5b7 204{
5819eadd
TZ		 205 struct hist_field *operand = hist_field->operands[0];
206
df35d93b 207 u64 val = operand->fn(operand, elt, rbe, event);
4b94f5b7
NK		 208
209 return (u64) ilog2(roundup_pow_of_two(val));
210}
211
df35d93b
TZ		 212static u64 hist_field_plus(struct hist_field *hist_field,
213 struct tracing_map_elt *elt,
214 struct ring_buffer_event *rbe,
215 void *event)
100719dc
TZ		 216{
217 struct hist_field *operand1 = hist_field->operands[0];
218 struct hist_field *operand2 = hist_field->operands[1];
219
df35d93b
TZ		 220 u64 val1 = operand1->fn(operand1, elt, rbe, event);
221 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 222
223 return val1 + val2;
224}
225
df35d93b
TZ		 226static u64 hist_field_minus(struct hist_field *hist_field,
227 struct tracing_map_elt *elt,
228 struct ring_buffer_event *rbe,
229 void *event)
100719dc
TZ		 230{
231 struct hist_field *operand1 = hist_field->operands[0];
232 struct hist_field *operand2 = hist_field->operands[1];
233
df35d93b
TZ		 234 u64 val1 = operand1->fn(operand1, elt, rbe, event);
235 u64 val2 = operand2->fn(operand2, elt, rbe, event);
100719dc
TZ		 236
237 return val1 - val2;
238}
239
df35d93b
TZ		 240static u64 hist_field_unary_minus(struct hist_field *hist_field,
241 struct tracing_map_elt *elt,
242 struct ring_buffer_event *rbe,
243 void *event)
100719dc
TZ		 244{
245 struct hist_field *operand = hist_field->operands[0];
246
df35d93b 247 s64 sval = (s64)operand->fn(operand, elt, rbe, event);
100719dc
TZ		 248 u64 val = (u64)-sval;
249
250 return val;
251}
252
7ef224d1 253#define DEFINE_HIST_FIELD_FN(type) \
fbd302cb 254 static u64 hist_field_##type(struct hist_field *hist_field, \
df35d93b
TZ		 255 struct tracing_map_elt *elt, \
256 struct ring_buffer_event *rbe, \
257 void *event) \
7ef224d1
TZ		 258{ \
259 type *addr = (type *)(event + hist_field->field->offset); \
260 \
79e577cb 261 return (u64)(unsigned long)*addr; \
7ef224d1
TZ		 262}
263
264DEFINE_HIST_FIELD_FN(s64);
265DEFINE_HIST_FIELD_FN(u64);
266DEFINE_HIST_FIELD_FN(s32);
267DEFINE_HIST_FIELD_FN(u32);
268DEFINE_HIST_FIELD_FN(s16);
269DEFINE_HIST_FIELD_FN(u16);
270DEFINE_HIST_FIELD_FN(s8);
271DEFINE_HIST_FIELD_FN(u8);
272
273#define for_each_hist_field(i, hist_data) \
274 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
275
276#define for_each_hist_val_field(i, hist_data) \
277 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
278
279#define for_each_hist_key_field(i, hist_data) \
280 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
281
69a0200c
TZ		 282#define HIST_STACKTRACE_DEPTH 16
283#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
284#define HIST_STACKTRACE_SKIP 5
285
7ef224d1 286#define HITCOUNT_IDX 0
69a0200c 287#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
7ef224d1
TZ		 288
289enum hist_field_flags {
0d7a8325
TZ		 290 HIST_FIELD_FL_HITCOUNT = 1 << 0,
291 HIST_FIELD_FL_KEY = 1 << 1,
292 HIST_FIELD_FL_STRING = 1 << 2,
293 HIST_FIELD_FL_HEX = 1 << 3,
294 HIST_FIELD_FL_SYM = 1 << 4,
295 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
296 HIST_FIELD_FL_EXECNAME = 1 << 6,
297 HIST_FIELD_FL_SYSCALL = 1 << 7,
298 HIST_FIELD_FL_STACKTRACE = 1 << 8,
299 HIST_FIELD_FL_LOG2 = 1 << 9,
ad42febe 300 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
860f9f6b 301 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
30350d65 302 HIST_FIELD_FL_VAR = 1 << 12,
100719dc 303 HIST_FIELD_FL_EXPR = 1 << 13,
067fe038 304 HIST_FIELD_FL_VAR_REF = 1 << 14,
8b7622bf 305 HIST_FIELD_FL_CPU = 1 << 15,
7e8b88a3 306 HIST_FIELD_FL_ALIAS = 1 << 16,
30350d65
TZ		 307};
308
309struct var_defs {
310 unsigned int n_vars;
311 char *name[TRACING_MAP_VARS_MAX];
312 char *expr[TRACING_MAP_VARS_MAX];
7ef224d1
TZ		 313};
314
315struct hist_trigger_attrs {
316 char *keys_str;
f2606835 317 char *vals_str;
e62347d2 318 char *sort_key_str;
5463bfda 319 char *name;
a4072fe8 320 char *clock;
83e99914
TZ		 321 bool pause;
322 bool cont;
e86ae9ba 323 bool clear;
860f9f6b 324 bool ts_in_usecs;
7ef224d1 325 unsigned int map_bits;
30350d65
TZ		 326
327 char *assignment_str[TRACING_MAP_VARS_MAX];
328 unsigned int n_assignments;
329
0212e2aa
TZ		 330 char *action_str[HIST_ACTIONS_MAX];
331 unsigned int n_actions;
332
30350d65 333 struct var_defs var_defs;
7ef224d1
TZ		 334};
335
02205a67
TZ		 336struct field_var {
337 struct hist_field *var;
338 struct hist_field *val;
339};
340
341struct field_var_hist {
342 struct hist_trigger_data *hist_data;
343 char *cmd;
344};
345
7ef224d1 346struct hist_trigger_data {
30350d65 347 struct hist_field *fields[HIST_FIELDS_MAX];
7ef224d1
TZ		 348 unsigned int n_vals;
349 unsigned int n_keys;
350 unsigned int n_fields;
30350d65 351 unsigned int n_vars;
7ef224d1
TZ		 352 unsigned int key_size;
353 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
354 unsigned int n_sort_keys;
355 struct trace_event_file *event_file;
356 struct hist_trigger_attrs *attrs;
357 struct tracing_map *map;
ad42febe 358 bool enable_timestamps;
30350d65 359 bool remove;
067fe038
TZ		 360 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
361 unsigned int n_var_refs;
0212e2aa
TZ		 362
363 struct action_data *actions[HIST_ACTIONS_MAX];
364 unsigned int n_actions;
02205a67
TZ		 365
366 struct field_var *field_vars[SYNTH_FIELDS_MAX];
367 unsigned int n_field_vars;
368 unsigned int n_field_var_str;
369 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
370 unsigned int n_field_var_hists;
50450603 371
7d18a10c
TZ		 372 struct field_var *save_vars[SYNTH_FIELDS_MAX];
373 unsigned int n_save_vars;
374 unsigned int n_save_var_str;
0212e2aa
TZ		 375};
376
7bbab38d
MH		 377static int synth_event_create(int argc, const char **argv);
378static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
379static int synth_event_release(struct dyn_event *ev);
380static bool synth_event_is_busy(struct dyn_event *ev);
381static bool synth_event_match(const char *system, const char *event,
30199137 382 int argc, const char **argv, struct dyn_event *ev);
7bbab38d
MH		 383
384static struct dyn_event_operations synth_event_ops = {
385 .create = synth_event_create,
386 .show = synth_event_show,
387 .is_busy = synth_event_is_busy,
388 .free = synth_event_release,
389 .match = synth_event_match,
390};
391
4b147936
TZ		 392struct synth_field {
393 char *type;
394 char *name;
395 size_t size;
396 bool is_signed;
397 bool is_string;
398};
399
400struct synth_event {
7bbab38d 401 struct dyn_event devent;
4b147936
TZ		 402 int ref;
403 char *name;
404 struct synth_field **fields;
405 unsigned int n_fields;
406 unsigned int n_u64;
407 struct trace_event_class class;
408 struct trace_event_call call;
409 struct tracepoint *tp;
410};
411
7bbab38d
MH		 412static bool is_synth_event(struct dyn_event *ev)
413{
414 return ev->ops == &synth_event_ops;
415}
416
417static struct synth_event *to_synth_event(struct dyn_event *ev)
418{
419 return container_of(ev, struct synth_event, devent);
420}
421
422static bool synth_event_is_busy(struct dyn_event *ev)
423{
424 struct synth_event *event = to_synth_event(ev);
425
426 return event->ref != 0;
427}
428
429static bool synth_event_match(const char *system, const char *event,
30199137 430 int argc, const char **argv, struct dyn_event *ev)
7bbab38d
MH		 431{
432 struct synth_event *sev = to_synth_event(ev);
433
434 return strcmp(sev->name, event) == 0 &&
435 (!system || strcmp(system, SYNTH_SYSTEM) == 0);
436}
437
0212e2aa
TZ		 438struct action_data;
439
440typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
441 struct tracing_map_elt *elt, void *rec,
7d18a10c 442 struct ring_buffer_event *rbe, void *key,
0212e2aa
TZ		 443 struct action_data *data, u64 *var_ref_vals);
444
466f4528
TZ		 445typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
446
7d18a10c
TZ		 447enum handler_id {
448 HANDLER_ONMATCH = 1,
449 HANDLER_ONMAX,
dff81f55 450 HANDLER_ONCHANGE,
7d18a10c
TZ		 451};
452
453enum action_id {
454 ACTION_SAVE = 1,
455 ACTION_TRACE,
a3785b7e 456 ACTION_SNAPSHOT,
7d18a10c
TZ		 457};
458
0212e2aa 459struct action_data {
7d18a10c
TZ		 460 enum handler_id handler;
461 enum action_id action;
462 char *action_name;
0212e2aa 463 action_fn_t fn;
7d18a10c 464
c282a386
TZ		 465 unsigned int n_params;
466 char *params[SYNTH_FIELDS_MAX];
467
c3e49506
TZ		 468 /*
469 * When a histogram trigger is hit, the values of any
470 * references to variables, including variables being passed
471 * as parameters to synthetic events, are collected into a
472 * var_ref_vals array. This var_ref_idx is the index of the
473 * first param in the array to be passed to the synthetic
474 * event invocation.
475 */
476 unsigned int var_ref_idx;
477 struct synth_event *synth_event;
e91eefd7
TZ		 478 bool use_trace_keyword;
479 char *synth_event_name;
c3e49506 480
c282a386
TZ		 481 union {
482 struct {
c3e49506
TZ		 483 char *event;
484 char *event_system;
485 } match_data;
50450603
TZ		 486
487 struct {
466f4528
TZ		 488 /*
489 * var_str contains the $-unstripped variable
490 * name referenced by var_ref, and used when
491 * printing the action. Because var_ref
492 * creation is deferred to create_actions(),
493 * we need a per-action way to save it until
494 * then, thus var_str.
495 */
50450603 496 char *var_str;
466f4528
TZ		 497
498 /*
499 * var_ref refers to the variable being
500 * tracked e.g onmax($var).
501 */
502 struct hist_field *var_ref;
503
504 /*
505 * track_var contains the 'invisible' tracking
506 * variable created to keep the current
507 * e.g. max value.
508 */
509 struct hist_field *track_var;
510
511 check_track_val_fn_t check_val;
512 action_fn_t save_data;
513 } track_data;
c282a386 514 };
7ef224d1
TZ		 515};
516
a3785b7e
TZ		 517struct track_data {
518 u64 track_val;
519 bool updated;
520
521 unsigned int key_len;
522 void *key;
523 struct tracing_map_elt elt;
524
525 struct action_data *action_data;
526 struct hist_trigger_data *hist_data;
527};
528
529struct hist_elt_data {
530 char *comm;
531 u64 *var_ref_vals;
532 char *field_var_str[SYNTH_FIELDS_MAX];
533};
534
535struct snapshot_context {
536 struct tracing_map_elt *elt;
537 void *key;
538};
539
540static void track_data_free(struct track_data *track_data)
541{
542 struct hist_elt_data *elt_data;
543
544 if (!track_data)
545 return;
546
547 kfree(track_data->key);
548
549 elt_data = track_data->elt.private_data;
550 if (elt_data) {
551 kfree(elt_data->comm);
552 kfree(elt_data);
553 }
554
555 kfree(track_data);
556}
557
558static struct track_data *track_data_alloc(unsigned int key_len,
559 struct action_data *action_data,
560 struct hist_trigger_data *hist_data)
561{
562 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
563 struct hist_elt_data *elt_data;
564
565 if (!data)
566 return ERR_PTR(-ENOMEM);
567
568 data->key = kzalloc(key_len, GFP_KERNEL);
569 if (!data->key) {
570 track_data_free(data);
571 return ERR_PTR(-ENOMEM);
572 }
573
574 data->key_len = key_len;
575 data->action_data = action_data;
576 data->hist_data = hist_data;
577
578 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
579 if (!elt_data) {
580 track_data_free(data);
581 return ERR_PTR(-ENOMEM);
582 }
583 data->elt.private_data = elt_data;
584
585 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
586 if (!elt_data->comm) {
587 track_data_free(data);
588 return ERR_PTR(-ENOMEM);
589 }
590
591 return data;
592}
593
a1a05bb4
TZ		 594static char last_cmd[MAX_FILTER_STR_VAL];
595static char last_cmd_loc[MAX_FILTER_STR_VAL];
f404da6e 596
d566c5e9 597static int errpos(char *str)
f404da6e 598{
d566c5e9 599 return err_pos(last_cmd, str);
f404da6e
TZ		 600}
601
a1a05bb4 602static void last_cmd_set(struct trace_event_file *file, char *str)
f404da6e 603{
a1a05bb4
TZ		 604 const char *system = NULL, *name = NULL;
605 struct trace_event_call *call;
f404da6e
TZ		 606
607 if (!str)
608 return;
609
a1a05bb4 610 strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
f404da6e 611
a1a05bb4
TZ		 612 if (file) {
613 call = file->event_call;
f404da6e 614
a1a05bb4
TZ		 615 system = call->class->system;
616 if (system) {
617 name = trace_event_name(call);
618 if (!name)
619 system = NULL;
620 }
621 }
f404da6e 622
a1a05bb4
TZ		 623 if (system)
624 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
f404da6e
TZ		 625}
626
d0cd871b 627static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
f404da6e 628{
2f754e77
SRV		 629 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
630 err_type, err_pos);
f404da6e
TZ		 631}
632
633static void hist_err_clear(void)
634{
a1a05bb4
TZ		 635 last_cmd[0] = '\0';
636 last_cmd_loc[0] = '\0';
f404da6e
TZ		 637}
638
4b147936
TZ		 639struct synth_trace_event {
640 struct trace_entry ent;
641 u64 fields[];
642};
643
644static int synth_event_define_fields(struct trace_event_call *call)
645{
646 struct synth_trace_event trace;
647 int offset = offsetof(typeof(trace), fields);
648 struct synth_event *event = call->data;
649 unsigned int i, size, n_u64;
650 char *name, *type;
651 bool is_signed;
652 int ret = 0;
653
654 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
655 size = event->fields[i]->size;
656 is_signed = event->fields[i]->is_signed;
657 type = event->fields[i]->type;
658 name = event->fields[i]->name;
659 ret = trace_define_field(call, type, name, offset, size,
660 is_signed, FILTER_OTHER);
661 if (ret)
662 break;
663
664 if (event->fields[i]->is_string) {
665 offset += STR_VAR_LEN_MAX;
666 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
667 } else {
668 offset += sizeof(u64);
669 n_u64++;
670 }
671 }
672
673 event->n_u64 = n_u64;
674
675 return ret;
676}
677
678static bool synth_field_signed(char *type)
679{
b6b27355 680 if (str_has_prefix(type, "u"))
4b147936 681 return false;
9fa8c9c6
ZX		 682 if (strcmp(type, "gfp_t") == 0)
683 return false;
4b147936
TZ		 684
685 return true;
686}
687
688static int synth_field_is_string(char *type)
689{
690 if (strstr(type, "char[") != NULL)
691 return true;
692
693 return false;
694}
695
696static int synth_field_string_size(char *type)
697{
698 char buf[4], *end, *start;
699 unsigned int len;
700 int size, err;
701
702 start = strstr(type, "char[");
703 if (start == NULL)
704 return -EINVAL;
2f31ed93 705 start += sizeof("char[") - 1;
4b147936
TZ		 706
707 end = strchr(type, ']');
708 if (!end || end < start)
709 return -EINVAL;
710
711 len = end - start;
712 if (len > 3)
713 return -EINVAL;
714
715 strncpy(buf, start, len);
716 buf[len] = '\0';
717
718 err = kstrtouint(buf, 0, &size);
719 if (err)
720 return err;
721
722 if (size > STR_VAR_LEN_MAX)
723 return -EINVAL;
724
725 return size;
726}
727
728static int synth_field_size(char *type)
729{
730 int size = 0;
731
732 if (strcmp(type, "s64") == 0)
733 size = sizeof(s64);
734 else if (strcmp(type, "u64") == 0)
735 size = sizeof(u64);
736 else if (strcmp(type, "s32") == 0)
737 size = sizeof(s32);
738 else if (strcmp(type, "u32") == 0)
739 size = sizeof(u32);
740 else if (strcmp(type, "s16") == 0)
741 size = sizeof(s16);
742 else if (strcmp(type, "u16") == 0)
743 size = sizeof(u16);
744 else if (strcmp(type, "s8") == 0)
745 size = sizeof(s8);
746 else if (strcmp(type, "u8") == 0)
747 size = sizeof(u8);
748 else if (strcmp(type, "char") == 0)
749 size = sizeof(char);
750 else if (strcmp(type, "unsigned char") == 0)
751 size = sizeof(unsigned char);
752 else if (strcmp(type, "int") == 0)
753 size = sizeof(int);
754 else if (strcmp(type, "unsigned int") == 0)
755 size = sizeof(unsigned int);
756 else if (strcmp(type, "long") == 0)
757 size = sizeof(long);
758 else if (strcmp(type, "unsigned long") == 0)
759 size = sizeof(unsigned long);
760 else if (strcmp(type, "pid_t") == 0)
761 size = sizeof(pid_t);
ac681546
ZX		 762 else if (strcmp(type, "gfp_t") == 0)
763 size = sizeof(gfp_t);
4b147936
TZ		 764 else if (synth_field_is_string(type))
765 size = synth_field_string_size(type);
766
767 return size;
768}
769
770static const char *synth_field_fmt(char *type)
771{
772 const char *fmt = "%llu";
773
774 if (strcmp(type, "s64") == 0)
775 fmt = "%lld";
776 else if (strcmp(type, "u64") == 0)
777 fmt = "%llu";
778 else if (strcmp(type, "s32") == 0)
779 fmt = "%d";
780 else if (strcmp(type, "u32") == 0)
781 fmt = "%u";
782 else if (strcmp(type, "s16") == 0)
783 fmt = "%d";
784 else if (strcmp(type, "u16") == 0)
785 fmt = "%u";
786 else if (strcmp(type, "s8") == 0)
787 fmt = "%d";
788 else if (strcmp(type, "u8") == 0)
789 fmt = "%u";
790 else if (strcmp(type, "char") == 0)
791 fmt = "%d";
792 else if (strcmp(type, "unsigned char") == 0)
793 fmt = "%u";
794 else if (strcmp(type, "int") == 0)
795 fmt = "%d";
796 else if (strcmp(type, "unsigned int") == 0)
797 fmt = "%u";
798 else if (strcmp(type, "long") == 0)
799 fmt = "%ld";
800 else if (strcmp(type, "unsigned long") == 0)
801 fmt = "%lu";
802 else if (strcmp(type, "pid_t") == 0)
803 fmt = "%d";
ac681546
ZX		 804 else if (strcmp(type, "gfp_t") == 0)
805 fmt = "%x";
4b147936
TZ		 806 else if (synth_field_is_string(type))
807 fmt = "%s";
808
809 return fmt;
810}
811
812static enum print_line_t print_synth_event(struct trace_iterator *iter,
813 int flags,
814 struct trace_event *event)
815{
816 struct trace_array *tr = iter->tr;
817 struct trace_seq *s = &iter->seq;
818 struct synth_trace_event *entry;
819 struct synth_event *se;
820 unsigned int i, n_u64;
821 char print_fmt[32];
822 const char *fmt;
823
824 entry = (struct synth_trace_event *)iter->ent;
825 se = container_of(event, struct synth_event, call.event);
826
827 trace_seq_printf(s, "%s: ", se->name);
828
829 for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
830 if (trace_seq_has_overflowed(s))
831 goto end;
832
833 fmt = synth_field_fmt(se->fields[i]->type);
834
835 /* parameter types */
836 if (tr->trace_flags & TRACE_ITER_VERBOSE)
837 trace_seq_printf(s, "%s ", fmt);
838
839 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
840
841 /* parameter values */
842 if (se->fields[i]->is_string) {
843 trace_seq_printf(s, print_fmt, se->fields[i]->name,
844 (char *)&entry->fields[n_u64],
845 i == se->n_fields - 1 ? "" : " ");
846 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
847 } else {
ac681546
ZX		 848 struct trace_print_flags __flags[] = {
849 __def_gfpflag_names, {-1, NULL} };
850
4b147936
TZ		 851 trace_seq_printf(s, print_fmt, se->fields[i]->name,
852 entry->fields[n_u64],
853 i == se->n_fields - 1 ? "" : " ");
ac681546
ZX		 854
855 if (strcmp(se->fields[i]->type, "gfp_t") == 0) {
856 trace_seq_puts(s, " (");
857 trace_print_flags_seq(s, "|",
858 entry->fields[n_u64],
859 __flags);
860 trace_seq_putc(s, ')');
861 }
4b147936
TZ		 862 n_u64++;
863 }
864 }
865end:
866 trace_seq_putc(s, '\n');
867
868 return trace_handle_return(s);
869}
870
871static struct trace_event_functions synth_event_funcs = {
872 .trace = print_synth_event
873};
874
875static notrace void trace_event_raw_event_synth(void *__data,
876 u64 *var_ref_vals,
877 unsigned int var_ref_idx)
878{
879 struct trace_event_file *trace_file = __data;
880 struct synth_trace_event *entry;
881 struct trace_event_buffer fbuffer;
4708abc6 882 struct ring_buffer *buffer;
4b147936
TZ		 883 struct synth_event *event;
884 unsigned int i, n_u64;
885 int fields_size = 0;
886
887 event = trace_file->event_call->data;
888
889 if (trace_trigger_soft_disabled(trace_file))
890 return;
891
892 fields_size = event->n_u64 * sizeof(u64);
893
4708abc6
SRV		 894 /*
895 * Avoid ring buffer recursion detection, as this event
896 * is being performed within another event.
897 */
898 buffer = trace_file->tr->trace_buffer.buffer;
899 ring_buffer_nest_start(buffer);
900
4b147936
TZ		 901 entry = trace_event_buffer_reserve(&fbuffer, trace_file,
902 sizeof(*entry) + fields_size);
903 if (!entry)
4708abc6 904 goto out;
4b147936
TZ		 905
906 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
907 if (event->fields[i]->is_string) {
908 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
909 char *str_field = (char *)&entry->fields[n_u64];
910
ad452870 911 strscpy(str_field, str_val, STR_VAR_LEN_MAX);
4b147936
TZ		 912 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
913 } else {
914 entry->fields[n_u64] = var_ref_vals[var_ref_idx + i];
915 n_u64++;
916 }
917 }
918
919 trace_event_buffer_commit(&fbuffer);
4708abc6
SRV		 920out:
921 ring_buffer_nest_end(buffer);
4b147936
TZ		 922}
923
924static void free_synth_event_print_fmt(struct trace_event_call *call)
925{
926 if (call) {
927 kfree(call->print_fmt);
928 call->print_fmt = NULL;
929 }
930}
931
932static int __set_synth_event_print_fmt(struct synth_event *event,
933 char *buf, int len)
934{
935 const char *fmt;
936 int pos = 0;
937 int i;
938
939 /* When len=0, we just calculate the needed length */
940#define LEN_OR_ZERO (len ? len - pos : 0)
941
942 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
943 for (i = 0; i < event->n_fields; i++) {
944 fmt = synth_field_fmt(event->fields[i]->type);
945 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
946 event->fields[i]->name, fmt,
947 i == event->n_fields - 1 ? "" : ", ");
948 }
949 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
950
951 for (i = 0; i < event->n_fields; i++) {
952 pos += snprintf(buf + pos, LEN_OR_ZERO,
953 ", REC->%s", event->fields[i]->name);
954 }
955
956#undef LEN_OR_ZERO
957
958 /* return the length of print_fmt */
959 return pos;
960}
961
962static int set_synth_event_print_fmt(struct trace_event_call *call)
963{
964 struct synth_event *event = call->data;
965 char *print_fmt;
966 int len;
967
968 /* First: called with 0 length to calculate the needed length */
969 len = __set_synth_event_print_fmt(event, NULL, 0);
970
971 print_fmt = kmalloc(len + 1, GFP_KERNEL);
972 if (!print_fmt)
973 return -ENOMEM;
974
975 /* Second: actually write the @print_fmt */
976 __set_synth_event_print_fmt(event, print_fmt, len + 1);
977 call->print_fmt = print_fmt;
978
979 return 0;
980}
981
982static void free_synth_field(struct synth_field *field)
983{
984 kfree(field->type);
985 kfree(field->name);
986 kfree(field);
987}
988
7bbab38d 989static struct synth_field *parse_synth_field(int argc, const char **argv,
282447ba 990 int *consumed)
4b147936
TZ		 991{
992 struct synth_field *field;
7bbab38d 993 const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
4b147936 994 int len, ret = 0;
4b147936
TZ		 995
996 if (field_type[0] == ';')
997 field_type++;
998
282447ba
MH		 999 if (!strcmp(field_type, "unsigned")) {
1000 if (argc < 3)
1001 return ERR_PTR(-EINVAL);
1002 prefix = "unsigned ";
1003 field_type = argv[1];
1004 field_name = argv[2];
1005 *consumed = 3;
1006 } else {
1007 field_name = argv[1];
1008 *consumed = 2;
1009 }
1010
4b147936
TZ		 1011 field = kzalloc(sizeof(*field), GFP_KERNEL);
1012 if (!field)
1013 return ERR_PTR(-ENOMEM);
1014
7bbab38d 1015 len = strlen(field_name);
4b147936 1016 array = strchr(field_name, '[');
7bbab38d
MH		 1017 if (array)
1018 len -= strlen(array);
1019 else if (field_name[len - 1] == ';')
1020 len--;
1021
1022 field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
1023 if (!field->name) {
1024 ret = -ENOMEM;
1025 goto free;
1026 }
1027
1028 if (field_type[0] == ';')
1029 field_type++;
1030 len = strlen(field_type) + 1;
4b147936
TZ		 1031 if (array)
1032 len += strlen(array);
282447ba
MH		 1033 if (prefix)
1034 len += strlen(prefix);
7bbab38d 1035
4b147936
TZ		 1036 field->type = kzalloc(len, GFP_KERNEL);
1037 if (!field->type) {
1038 ret = -ENOMEM;
1039 goto free;
1040 }
282447ba
MH		 1041 if (prefix)
1042 strcat(field->type, prefix);
4b147936
TZ		 1043 strcat(field->type, field_type);
1044 if (array) {
1045 strcat(field->type, array);
7bbab38d
MH		 1046 if (field->type[len - 1] == ';')
1047 field->type[len - 1] = '\0';
4b147936
TZ		 1048 }
1049
1050 field->size = synth_field_size(field->type);
1051 if (!field->size) {
1052 ret = -EINVAL;
1053 goto free;
1054 }
1055
1056 if (synth_field_is_string(field->type))
1057 field->is_string = true;
1058
1059 field->is_signed = synth_field_signed(field->type);
1060
4b147936
TZ		 1061 out:
1062 return field;
1063 free:
1064 free_synth_field(field);
1065 field = ERR_PTR(ret);
1066 goto out;
1067}
1068
1069static void free_synth_tracepoint(struct tracepoint *tp)
1070{
1071 if (!tp)
1072 return;
1073
1074 kfree(tp->name);
1075 kfree(tp);
1076}
1077
1078static struct tracepoint *alloc_synth_tracepoint(char *name)
1079{
1080 struct tracepoint *tp;
1081
1082 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
1083 if (!tp)
1084 return ERR_PTR(-ENOMEM);
1085
1086 tp->name = kstrdup(name, GFP_KERNEL);
1087 if (!tp->name) {
1088 kfree(tp);
1089 return ERR_PTR(-ENOMEM);
1090 }
1091
1092 return tp;
1093}
1094
1095typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
1096 unsigned int var_ref_idx);
1097
1098static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
1099 unsigned int var_ref_idx)
1100{
1101 struct tracepoint *tp = event->tp;
1102
1103 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
1104 struct tracepoint_func *probe_func_ptr;
1105 synth_probe_func_t probe_func;
1106 void *__data;
1107
1108 if (!(cpu_online(raw_smp_processor_id())))
1109 return;
1110
1111 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
1112 if (probe_func_ptr) {
1113 do {
1114 probe_func = probe_func_ptr->func;
1115 __data = probe_func_ptr->data;
1116 probe_func(__data, var_ref_vals, var_ref_idx);
1117 } while ((++probe_func_ptr)->func);
1118 }
1119 }
1120}
1121
1122static struct synth_event *find_synth_event(const char *name)
1123{
7bbab38d 1124 struct dyn_event *pos;
4b147936
TZ		 1125 struct synth_event *event;
1126
7bbab38d
MH		 1127 for_each_dyn_event(pos) {
1128 if (!is_synth_event(pos))
1129 continue;
1130 event = to_synth_event(pos);
4b147936
TZ		 1131 if (strcmp(event->name, name) == 0)
1132 return event;
1133 }
1134
1135 return NULL;
1136}
1137
1138static int register_synth_event(struct synth_event *event)
1139{
1140 struct trace_event_call *call = &event->call;
1141 int ret = 0;
1142
1143 event->call.class = &event->class;
1144 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
1145 if (!event->class.system) {
1146 ret = -ENOMEM;
1147 goto out;
1148 }
1149
1150 event->tp = alloc_synth_tracepoint(event->name);
1151 if (IS_ERR(event->tp)) {
1152 ret = PTR_ERR(event->tp);
1153 event->tp = NULL;
1154 goto out;
1155 }
1156
1157 INIT_LIST_HEAD(&call->class->fields);
1158 call->event.funcs = &synth_event_funcs;
1159 call->class->define_fields = synth_event_define_fields;
1160
1161 ret = register_trace_event(&call->event);
1162 if (!ret) {
1163 ret = -ENODEV;
1164 goto out;
1165 }
1166 call->flags = TRACE_EVENT_FL_TRACEPOINT;
1167 call->class->reg = trace_event_reg;
1168 call->class->probe = trace_event_raw_event_synth;
1169 call->data = event;
1170 call->tp = event->tp;
1171
7e1413ed 1172 ret = trace_add_event_call(call);
4b147936
TZ		 1173 if (ret) {
1174 pr_warn("Failed to register synthetic event: %s\n",
1175 trace_event_name(call));
1176 goto err;
1177 }
1178
1179 ret = set_synth_event_print_fmt(call);
1180 if (ret < 0) {
7e1413ed 1181 trace_remove_event_call(call);
4b147936
TZ		 1182 goto err;
1183 }
1184 out:
1185 return ret;
1186 err:
1187 unregister_trace_event(&call->event);
1188 goto out;
1189}
1190
1191static int unregister_synth_event(struct synth_event *event)
1192{
1193 struct trace_event_call *call = &event->call;
1194 int ret;
1195
7e1413ed 1196 ret = trace_remove_event_call(call);
4b147936
TZ		 1197
1198 return ret;
1199}
1200
1201static void free_synth_event(struct synth_event *event)
1202{
1203 unsigned int i;
1204
1205 if (!event)
1206 return;
1207
1208 for (i = 0; i < event->n_fields; i++)
1209 free_synth_field(event->fields[i]);
1210
1211 kfree(event->fields);
1212 kfree(event->name);
1213 kfree(event->class.system);
1214 free_synth_tracepoint(event->tp);
1215 free_synth_event_print_fmt(&event->call);
1216 kfree(event);
1217}
1218
7bbab38d 1219static struct synth_event *alloc_synth_event(const char *name, int n_fields,
4b147936
TZ		 1220 struct synth_field **fields)
1221{
1222 struct synth_event *event;
1223 unsigned int i;
1224
1225 event = kzalloc(sizeof(*event), GFP_KERNEL);
1226 if (!event) {
1227 event = ERR_PTR(-ENOMEM);
1228 goto out;
1229 }
1230
7bbab38d 1231 event->name = kstrdup(name, GFP_KERNEL);
4b147936
TZ		 1232 if (!event->name) {
1233 kfree(event);
1234 event = ERR_PTR(-ENOMEM);
1235 goto out;
1236 }
1237
1238 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
1239 if (!event->fields) {
1240 free_synth_event(event);
1241 event = ERR_PTR(-ENOMEM);
1242 goto out;
1243 }
1244
7bbab38d
MH		 1245 dyn_event_init(&event->devent, &synth_event_ops);
1246
4b147936
TZ		 1247 for (i = 0; i < n_fields; i++)
1248 event->fields[i] = fields[i];
1249
1250 event->n_fields = n_fields;
1251 out:
1252 return event;
1253}
1254
c282a386
TZ		 1255static void action_trace(struct hist_trigger_data *hist_data,
1256 struct tracing_map_elt *elt, void *rec,
7d18a10c 1257 struct ring_buffer_event *rbe, void *key,
c282a386
TZ		 1258 struct action_data *data, u64 *var_ref_vals)
1259{
c3e49506 1260 struct synth_event *event = data->synth_event;
c282a386 1261
c3e49506 1262 trace_synth(event, var_ref_vals, data->var_ref_idx);
c282a386
TZ		 1263}
1264
1265struct hist_var_data {
1266 struct list_head list;
1267 struct hist_trigger_data *hist_data;
1268};
1269
7bbab38d 1270static int __create_synth_event(int argc, const char *name, const char **argv)
4b147936
TZ		 1271{
1272 struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
1273 struct synth_event *event = NULL;
282447ba 1274 int i, consumed = 0, n_fields = 0, ret = 0;
4b147936
TZ		 1275
1276 /*
1277 * Argument syntax:
1278 * - Add synthetic event: <event_name> field[;field] ...
1279 * - Remove synthetic event: !<event_name> field[;field] ...
1280 * where 'field' = type field_name
1281 */
4b147936 1282
7bbab38d
MH		 1283 if (name[0] == '\0' || argc < 1)
1284 return -EINVAL;
1285
1286 mutex_lock(&event_mutex);
4b147936
TZ		 1287
1288 event = find_synth_event(name);
1289 if (event) {
7bbab38d 1290 ret = -EEXIST;
4b147936 1291 goto out;
18858511 1292 }
4b147936 1293
7bbab38d 1294 for (i = 0; i < argc - 1; i++) {
4b147936
TZ		 1295 if (strcmp(argv[i], ";") == 0)
1296 continue;
1297 if (n_fields == SYNTH_FIELDS_MAX) {
1298 ret = -EINVAL;
1299 goto err;
1300 }
1301
282447ba 1302 field = parse_synth_field(argc - i, &argv[i], &consumed);
4b147936
TZ		 1303 if (IS_ERR(field)) {
1304 ret = PTR_ERR(field);
1305 goto err;
1306 }
282447ba
MH		 1307 fields[n_fields++] = field;
1308 i += consumed - 1;
4b147936
TZ		 1309 }
1310
a360d9e4 1311 if (i < argc && strcmp(argv[i], ";") != 0) {
4b147936
TZ		 1312 ret = -EINVAL;
1313 goto err;
1314 }
1315
1316 event = alloc_synth_event(name, n_fields, fields);
1317 if (IS_ERR(event)) {
1318 ret = PTR_ERR(event);
1319 event = NULL;
1320 goto err;
1321 }
faacb361
MH		 1322 ret = register_synth_event(event);
1323 if (!ret)
7bbab38d 1324 dyn_event_add(&event->devent);
faacb361
MH		 1325 else
1326 free_synth_event(event);
4b147936 1327 out:
fc800a10 1328 mutex_unlock(&event_mutex);
4b147936
TZ		 1329
1330 return ret;
1331 err:
4b147936
TZ		 1332 for (i = 0; i < n_fields; i++)
1333 free_synth_field(fields[i]);
4b147936 1334
faacb361 1335 goto out;
4b147936
TZ		 1336}
1337
7bbab38d 1338static int create_or_delete_synth_event(int argc, char **argv)
4b147936 1339{
7bbab38d
MH		 1340 const char *name = argv[0];
1341 struct synth_event *event = NULL;
1342 int ret;
4b147936 1343
7bbab38d
MH		 1344 /* trace_run_command() ensures argc != 0 */
1345 if (name[0] == '!') {
1346 mutex_lock(&event_mutex);
7bbab38d
MH		 1347 event = find_synth_event(name + 1);
1348 if (event) {
1349 if (event->ref)
1350 ret = -EBUSY;
1351 else {
1352 ret = unregister_synth_event(event);
1353 if (!ret) {
1354 dyn_event_remove(&event->devent);
1355 free_synth_event(event);
1356 }
1357 }
faacb361 1358 } else
7bbab38d 1359 ret = -ENOENT;
7bbab38d
MH		 1360 mutex_unlock(&event_mutex);
1361 return ret;
4b147936
TZ		 1362 }
1363
7bbab38d
MH		 1364 ret = __create_synth_event(argc - 1, name, (const char **)argv + 1);
1365 return ret == -ECANCELED ? -EINVAL : ret;
4b147936
TZ		 1366}
1367
7bbab38d 1368static int synth_event_create(int argc, const char **argv)
4b147936 1369{
7bbab38d
MH		 1370 const char *name = argv[0];
1371 int len;
4b147936 1372
7bbab38d
MH		 1373 if (name[0] != 's' || name[1] != ':')
1374 return -ECANCELED;
1375 name += 2;
4b147936 1376
7bbab38d
MH		 1377 /* This interface accepts group name prefix */
1378 if (strchr(name, '/')) {
ed581aaf
TZ		 1379 len = str_has_prefix(name, SYNTH_SYSTEM "/");
1380 if (len == 0)
7bbab38d
MH		 1381 return -EINVAL;
1382 name += len;
1383 }
1384 return __create_synth_event(argc - 1, name, argv + 1);
4b147936
TZ		 1385}
1386
7bbab38d 1387static int synth_event_release(struct dyn_event *ev)
4b147936 1388{
7bbab38d
MH		 1389 struct synth_event *event = to_synth_event(ev);
1390 int ret;
1391
1392 if (event->ref)
1393 return -EBUSY;
1394
1395 ret = unregister_synth_event(event);
1396 if (ret)
1397 return ret;
1398
1399 dyn_event_remove(ev);
1400 free_synth_event(event);
1401 return 0;
4b147936
TZ		 1402}
1403
7bbab38d 1404static int __synth_event_show(struct seq_file *m, struct synth_event *event)
4b147936
TZ		 1405{
1406 struct synth_field *field;
4b147936
TZ		 1407 unsigned int i;
1408
1409 seq_printf(m, "%s\t", event->name);
1410
1411 for (i = 0; i < event->n_fields; i++) {
1412 field = event->fields[i];
1413
1414 /* parameter values */
1415 seq_printf(m, "%s %s%s", field->type, field->name,
1416 i == event->n_fields - 1 ? "" : "; ");
1417 }
1418
1419 seq_putc(m, '\n');
1420
1421 return 0;
1422}
1423
7bbab38d
MH		 1424static int synth_event_show(struct seq_file *m, struct dyn_event *ev)
1425{
1426 struct synth_event *event = to_synth_event(ev);
1427
1428 seq_printf(m, "s:%s/", event->class.system);
1429
1430 return __synth_event_show(m, event);
1431}
1432
1433static int synth_events_seq_show(struct seq_file *m, void *v)
1434{
1435 struct dyn_event *ev = v;
1436
1437 if (!is_synth_event(ev))
1438 return 0;
1439
1440 return __synth_event_show(m, to_synth_event(ev));
1441}
1442
4b147936 1443static const struct seq_operations synth_events_seq_op = {
7bbab38d
MH		 1444 .start = dyn_event_seq_start,
1445 .next = dyn_event_seq_next,
1446 .stop = dyn_event_seq_stop,
1447 .show = synth_events_seq_show,
4b147936
TZ		 1448};
1449
1450static int synth_events_open(struct inode *inode, struct file *file)
1451{
1452 int ret;
1453
17911ff3
SRV		 1454 ret = security_locked_down(LOCKDOWN_TRACEFS);
1455 if (ret)
1456 return ret;
1457
4b147936 1458 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
7bbab38d 1459 ret = dyn_events_release_all(&synth_event_ops);
4b147936
TZ		 1460 if (ret < 0)
1461 return ret;
1462 }
1463
1464 return seq_open(file, &synth_events_seq_op);
1465}
1466
1467static ssize_t synth_events_write(struct file *file,
1468 const char __user *buffer,
1469 size_t count, loff_t *ppos)
1470{
1471 return trace_parse_run_command(file, buffer, count, ppos,
7bbab38d 1472 create_or_delete_synth_event);
4b147936
TZ		 1473}
1474
1475static const struct file_operations synth_events_fops = {
1476 .open = synth_events_open,
1477 .write = synth_events_write,
1478 .read = seq_read,
1479 .llseek = seq_lseek,
1480 .release = seq_release,
1481};
1482
df35d93b
TZ		 1483static u64 hist_field_timestamp(struct hist_field *hist_field,
1484 struct tracing_map_elt *elt,
1485 struct ring_buffer_event *rbe,
1486 void *event)
860f9f6b
TZ		 1487{
1488 struct hist_trigger_data *hist_data = hist_field->hist_data;
1489 struct trace_array *tr = hist_data->event_file->tr;
1490
1491 u64 ts = ring_buffer_event_time_stamp(rbe);
1492
1493 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
1494 ts = ns2usecs(ts);
1495
1496 return ts;
1497}
1498
8b7622bf
TZ		 1499static u64 hist_field_cpu(struct hist_field *hist_field,
1500 struct tracing_map_elt *elt,
1501 struct ring_buffer_event *rbe,
1502 void *event)
1503{
1504 int cpu = smp_processor_id();
1505
1506 return cpu;
1507}
1508
de40f033
TZ		 1509/**
1510 * check_field_for_var_ref - Check if a VAR_REF field references a variable
1511 * @hist_field: The VAR_REF field to check
1512 * @var_data: The hist trigger that owns the variable
1513 * @var_idx: The trigger variable identifier
1514 *
1515 * Check the given VAR_REF field to see whether or not it references
1516 * the given variable associated with the given trigger.
1517 *
1518 * Return: The VAR_REF field if it does reference the variable, NULL if not
1519 */
067fe038
TZ		 1520static struct hist_field *
1521check_field_for_var_ref(struct hist_field *hist_field,
1522 struct hist_trigger_data *var_data,
1523 unsigned int var_idx)
1524{
e4f6d245 1525 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
067fe038 1526
e4f6d245
TZ		 1527 if (hist_field && hist_field->var.idx == var_idx &&
1528 hist_field->var.hist_data == var_data)
1529 return hist_field;
067fe038 1530
e4f6d245 1531 return NULL;
067fe038
TZ		 1532}
1533
de40f033
TZ		 1534/**
1535 * find_var_ref - Check if a trigger has a reference to a trigger variable
1536 * @hist_data: The hist trigger that might have a reference to the variable
1537 * @var_data: The hist trigger that owns the variable
1538 * @var_idx: The trigger variable identifier
1539 *
1540 * Check the list of var_refs[] on the first hist trigger to see
1541 * whether any of them are references to the variable on the second
1542 * trigger.
1543 *
1544 * Return: The VAR_REF field referencing the variable if so, NULL if not
1545 */
067fe038
TZ		 1546static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
1547 struct hist_trigger_data *var_data,
1548 unsigned int var_idx)
1549{
e4f6d245 1550 struct hist_field *hist_field;
067fe038
TZ		 1551 unsigned int i;
1552
e4f6d245
TZ		 1553 for (i = 0; i < hist_data->n_var_refs; i++) {
1554 hist_field = hist_data->var_refs[i];
1555 if (check_field_for_var_ref(hist_field, var_data, var_idx))
1556 return hist_field;
067fe038
TZ		 1557 }
1558
e4f6d245 1559 return NULL;
067fe038
TZ		 1560}
1561
de40f033
TZ		 1562/**
1563 * find_any_var_ref - Check if there is a reference to a given trigger variable
1564 * @hist_data: The hist trigger
1565 * @var_idx: The trigger variable identifier
1566 *
1567 * Check to see whether the given variable is currently referenced by
1568 * any other trigger.
1569 *
1570 * The trigger the variable is defined on is explicitly excluded - the
1571 * assumption being that a self-reference doesn't prevent a trigger
1572 * from being removed.
1573 *
1574 * Return: The VAR_REF field referencing the variable if so, NULL if not
1575 */
067fe038
TZ		 1576static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
1577 unsigned int var_idx)
1578{
1579 struct trace_array *tr = hist_data->event_file->tr;
1580 struct hist_field *found = NULL;
1581 struct hist_var_data *var_data;
1582
1583 list_for_each_entry(var_data, &tr->hist_vars, list) {
1584 if (var_data->hist_data == hist_data)
1585 continue;
1586 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
1587 if (found)
1588 break;
1589 }
1590
1591 return found;
1592}
1593
de40f033
TZ		 1594/**
1595 * check_var_refs - Check if there is a reference to any of trigger's variables
1596 * @hist_data: The hist trigger
1597 *
1598 * A trigger can define one or more variables. If any one of them is
1599 * currently referenced by any other trigger, this function will
1600 * determine that.
1601
1602 * Typically used to determine whether or not a trigger can be removed
1603 * - if there are any references to a trigger's variables, it cannot.
1604 *
1605 * Return: True if there is a reference to any of trigger's variables
1606 */
067fe038
TZ		 1607static bool check_var_refs(struct hist_trigger_data *hist_data)
1608{
1609 struct hist_field *field;
1610 bool found = false;
1611 int i;
1612
1613 for_each_hist_field(i, hist_data) {
1614 field = hist_data->fields[i];
1615 if (field && field->flags & HIST_FIELD_FL_VAR) {
1616 if (find_any_var_ref(hist_data, field->var.idx)) {
1617 found = true;
1618 break;
1619 }
1620 }
1621 }
1622
1623 return found;
1624}
1625
1626static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1627{
1628 struct trace_array *tr = hist_data->event_file->tr;
1629 struct hist_var_data *var_data, *found = NULL;
1630
1631 list_for_each_entry(var_data, &tr->hist_vars, list) {
1632 if (var_data->hist_data == hist_data) {
1633 found = var_data;
1634 break;
1635 }
1636 }
1637
1638 return found;
1639}
1640
1641static bool field_has_hist_vars(struct hist_field *hist_field,
1642 unsigned int level)
1643{
1644 int i;
1645
1646 if (level > 3)
1647 return false;
1648
1649 if (!hist_field)
1650 return false;
1651
1652 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1653 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1654 return true;
1655
1656 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1657 struct hist_field *operand;
1658
1659 operand = hist_field->operands[i];
1660 if (field_has_hist_vars(operand, level + 1))
1661 return true;
1662 }
1663
1664 return false;
1665}
1666
1667static bool has_hist_vars(struct hist_trigger_data *hist_data)
1668{
1669 struct hist_field *hist_field;
1670 int i;
1671
1672 for_each_hist_field(i, hist_data) {
1673 hist_field = hist_data->fields[i];
1674 if (field_has_hist_vars(hist_field, 0))
1675 return true;
1676 }
1677
1678 return false;
1679}
1680
1681static int save_hist_vars(struct hist_trigger_data *hist_data)
1682{
1683 struct trace_array *tr = hist_data->event_file->tr;
1684 struct hist_var_data *var_data;
1685
1686 var_data = find_hist_vars(hist_data);
1687 if (var_data)
1688 return 0;
1689
8530dec6 1690 if (tracing_check_open_get_tr(tr))
067fe038
TZ		 1691 return -ENODEV;
1692
1693 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1694 if (!var_data) {
1695 trace_array_put(tr);
1696 return -ENOMEM;
1697 }
1698
1699 var_data->hist_data = hist_data;
1700 list_add(&var_data->list, &tr->hist_vars);
1701
1702 return 0;
1703}
1704
1705static void remove_hist_vars(struct hist_trigger_data *hist_data)
1706{
1707 struct trace_array *tr = hist_data->event_file->tr;
1708 struct hist_var_data *var_data;
1709
1710 var_data = find_hist_vars(hist_data);
1711 if (!var_data)
1712 return;
1713
1714 if (WARN_ON(check_var_refs(hist_data)))
1715 return;
1716
1717 list_del(&var_data->list);
1718
1719 kfree(var_data);
1720
1721 trace_array_put(tr);
1722}
1723
30350d65
TZ		 1724static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1725 const char *var_name)
1726{
1727 struct hist_field *hist_field, *found = NULL;
1728 int i;
1729
1730 for_each_hist_field(i, hist_data) {
1731 hist_field = hist_data->fields[i];
1732 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1733 strcmp(hist_field->var.name, var_name) == 0) {
1734 found = hist_field;
1735 break;
1736 }
1737 }
1738
1739 return found;
1740}
1741
1742static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1743 struct trace_event_file *file,
1744 const char *var_name)
1745{
1746 struct hist_trigger_data *test_data;
1747 struct event_trigger_data *test;
1748 struct hist_field *hist_field;
1749
1750 hist_field = find_var_field(hist_data, var_name);
1751 if (hist_field)
1752 return hist_field;
1753
1754 list_for_each_entry_rcu(test, &file->triggers, list) {
1755 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1756 test_data = test->private_data;
1757 hist_field = find_var_field(test_data, var_name);
1758 if (hist_field)
1759 return hist_field;
1760 }
1761 }
1762
1763 return NULL;
1764}
1765
067fe038
TZ		 1766static struct trace_event_file *find_var_file(struct trace_array *tr,
1767 char *system,
1768 char *event_name,
1769 char *var_name)
1770{
1771 struct hist_trigger_data *var_hist_data;
1772 struct hist_var_data *var_data;
1773 struct trace_event_file *file, *found = NULL;
1774
1775 if (system)
1776 return find_event_file(tr, system, event_name);
1777
1778 list_for_each_entry(var_data, &tr->hist_vars, list) {
1779 var_hist_data = var_data->hist_data;
1780 file = var_hist_data->event_file;
1781 if (file == found)
1782 continue;
1783
1784 if (find_var_field(var_hist_data, var_name)) {
f404da6e 1785 if (found) {
d0cd871b 1786 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
067fe038 1787 return NULL;
f404da6e 1788 }
067fe038
TZ		 1789
1790 found = file;
1791 }
1792 }
1793
1794 return found;
1795}
1796
1797static struct hist_field *find_file_var(struct trace_event_file *file,
1798 const char *var_name)
1799{
1800 struct hist_trigger_data *test_data;
1801 struct event_trigger_data *test;
1802 struct hist_field *hist_field;
1803
1804 list_for_each_entry_rcu(test, &file->triggers, list) {
1805 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1806 test_data = test->private_data;
1807 hist_field = find_var_field(test_data, var_name);
1808 if (hist_field)
1809 return hist_field;
1810 }
1811 }
1812
1813 return NULL;
1814}
1815
c282a386
TZ		 1816static struct hist_field *
1817find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1818{
1819 struct trace_array *tr = hist_data->event_file->tr;
1820 struct hist_field *hist_field, *found = NULL;
1821 struct trace_event_file *file;
1822 unsigned int i;
1823
1824 for (i = 0; i < hist_data->n_actions; i++) {
1825 struct action_data *data = hist_data->actions[i];
1826
7d18a10c 1827 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 1828 char *system = data->match_data.event_system;
1829 char *event_name = data->match_data.event;
c282a386
TZ		 1830
1831 file = find_var_file(tr, system, event_name, var_name);
1832 if (!file)
1833 continue;
1834 hist_field = find_file_var(file, var_name);
1835 if (hist_field) {
1836 if (found) {
d0cd871b
SRV		 1837 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1838 errpos(var_name));
c282a386
TZ		 1839 return ERR_PTR(-EINVAL);
1840 }
1841
1842 found = hist_field;
1843 }
1844 }
1845 }
1846 return found;
1847}
1848
067fe038
TZ		 1849static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1850 char *system,
1851 char *event_name,
1852 char *var_name)
1853{
1854 struct trace_array *tr = hist_data->event_file->tr;
1855 struct hist_field *hist_field = NULL;
1856 struct trace_event_file *file;
1857
c282a386
TZ		 1858 if (!system || !event_name) {
1859 hist_field = find_match_var(hist_data, var_name);
1860 if (IS_ERR(hist_field))
1861 return NULL;
1862 if (hist_field)
1863 return hist_field;
1864 }
1865
067fe038
TZ		 1866 file = find_var_file(tr, system, event_name, var_name);
1867 if (!file)
1868 return NULL;
1869
1870 hist_field = find_file_var(file, var_name);
1871
1872 return hist_field;
1873}
1874
067fe038
TZ		 1875static u64 hist_field_var_ref(struct hist_field *hist_field,
1876 struct tracing_map_elt *elt,
1877 struct ring_buffer_event *rbe,
1878 void *event)
1879{
1880 struct hist_elt_data *elt_data;
1881 u64 var_val = 0;
1882
55267c88
TZ		 1883 if (WARN_ON_ONCE(!elt))
1884 return var_val;
1885
067fe038
TZ		 1886 elt_data = elt->private_data;
1887 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1888
1889 return var_val;
1890}
1891
1892static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1893 u64 *var_ref_vals, bool self)
1894{
1895 struct hist_trigger_data *var_data;
1896 struct tracing_map_elt *var_elt;
1897 struct hist_field *hist_field;
1898 unsigned int i, var_idx;
1899 bool resolved = true;
1900 u64 var_val = 0;
1901
1902 for (i = 0; i < hist_data->n_var_refs; i++) {
1903 hist_field = hist_data->var_refs[i];
1904 var_idx = hist_field->var.idx;
1905 var_data = hist_field->var.hist_data;
1906
1907 if (var_data == NULL) {
1908 resolved = false;
1909 break;
1910 }
1911
1912 if ((self && var_data != hist_data) ||
1913 (!self && var_data == hist_data))
1914 continue;
1915
1916 var_elt = tracing_map_lookup(var_data->map, key);
1917 if (!var_elt) {
1918 resolved = false;
1919 break;
1920 }
1921
1922 if (!tracing_map_var_set(var_elt, var_idx)) {
1923 resolved = false;
1924 break;
1925 }
1926
1927 if (self || !hist_field->read_once)
1928 var_val = tracing_map_read_var(var_elt, var_idx);
1929 else
1930 var_val = tracing_map_read_var_once(var_elt, var_idx);
1931
1932 var_ref_vals[i] = var_val;
1933 }
1934
1935 return resolved;
1936}
1937
85013256
TZ		 1938static const char *hist_field_name(struct hist_field *field,
1939 unsigned int level)
1940{
1941 const char *field_name = "";
1942
1943 if (level > 1)
1944 return field_name;
1945
1946 if (field->field)
1947 field_name = field->field->name;
7e8b88a3
TZ		 1948 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1949 field->flags & HIST_FIELD_FL_ALIAS)
5819eadd 1950 field_name = hist_field_name(field->operands[0], ++level);
8b7622bf
TZ		 1951 else if (field->flags & HIST_FIELD_FL_CPU)
1952 field_name = "cpu";
067fe038
TZ		 1953 else if (field->flags & HIST_FIELD_FL_EXPR ||
1954 field->flags & HIST_FIELD_FL_VAR_REF) {
1955 if (field->system) {
1956 static char full_name[MAX_FILTER_STR_VAL];
1957
1958 strcat(full_name, field->system);
1959 strcat(full_name, ".");
1960 strcat(full_name, field->event_name);
1961 strcat(full_name, ".");
1962 strcat(full_name, field->name);
1963 field_name = full_name;
1964 } else
1965 field_name = field->name;
0ae7961e
TZ		 1966 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1967 field_name = "common_timestamp";
85013256
TZ		 1968
1969 if (field_name == NULL)
1970 field_name = "";
1971
1972 return field_name;
1973}
1974
7ef224d1
TZ		 1975static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1976{
1977 hist_field_fn_t fn = NULL;
1978
1979 switch (field_size) {
1980 case 8:
1981 if (field_is_signed)
1982 fn = hist_field_s64;
1983 else
1984 fn = hist_field_u64;
1985 break;
1986 case 4:
1987 if (field_is_signed)
1988 fn = hist_field_s32;
1989 else
1990 fn = hist_field_u32;
1991 break;
1992 case 2:
1993 if (field_is_signed)
1994 fn = hist_field_s16;
1995 else
1996 fn = hist_field_u16;
1997 break;
1998 case 1:
1999 if (field_is_signed)
2000 fn = hist_field_s8;
2001 else
2002 fn = hist_field_u8;
2003 break;
2004 }
2005
2006 return fn;
2007}
2008
2009static int parse_map_size(char *str)
2010{
2011 unsigned long size, map_bits;
2012 int ret;
2013
2014 strsep(&str, "=");
2015 if (!str) {
2016 ret = -EINVAL;
2017 goto out;
2018 }
2019
2020 ret = kstrtoul(str, 0, &size);
2021 if (ret)
2022 goto out;
2023
2024 map_bits = ilog2(roundup_pow_of_two(size));
2025 if (map_bits < TRACING_MAP_BITS_MIN ||
2026 map_bits > TRACING_MAP_BITS_MAX)
2027 ret = -EINVAL;
2028 else
2029 ret = map_bits;
2030 out:
2031 return ret;
2032}
2033
2034static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
2035{
30350d65
TZ		 2036 unsigned int i;
2037
7ef224d1
TZ		 2038 if (!attrs)
2039 return;
2040
30350d65
TZ		 2041 for (i = 0; i < attrs->n_assignments; i++)
2042 kfree(attrs->assignment_str[i]);
2043
0212e2aa
TZ		 2044 for (i = 0; i < attrs->n_actions; i++)
2045 kfree(attrs->action_str[i]);
2046
5463bfda 2047 kfree(attrs->name);
e62347d2 2048 kfree(attrs->sort_key_str);
7ef224d1 2049 kfree(attrs->keys_str);
f2606835 2050 kfree(attrs->vals_str);
a4072fe8 2051 kfree(attrs->clock);
7ef224d1
TZ		 2052 kfree(attrs);
2053}
2054
0212e2aa
TZ		 2055static int parse_action(char *str, struct hist_trigger_attrs *attrs)
2056{
c282a386 2057 int ret = -EINVAL;
0212e2aa
TZ		 2058
2059 if (attrs->n_actions >= HIST_ACTIONS_MAX)
2060 return ret;
2061
754481e6 2062 if ((str_has_prefix(str, "onmatch(")) ||
dff81f55
TZ		 2063 (str_has_prefix(str, "onmax(")) ||
2064 (str_has_prefix(str, "onchange("))) {
c282a386
TZ		 2065 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
2066 if (!attrs->action_str[attrs->n_actions]) {
2067 ret = -ENOMEM;
2068 return ret;
2069 }
2070 attrs->n_actions++;
2071 ret = 0;
2072 }
0212e2aa
TZ		 2073 return ret;
2074}
2075
d0cd871b
SRV		 2076static int parse_assignment(struct trace_array *tr,
2077 char *str, struct hist_trigger_attrs *attrs)
9b1ae035
TZ		 2078{
2079 int ret = 0;
2080
754481e6
SRV		 2081 if ((str_has_prefix(str, "key=")) ||
2082 (str_has_prefix(str, "keys="))) {
9b1ae035
TZ		 2083 attrs->keys_str = kstrdup(str, GFP_KERNEL);
2084 if (!attrs->keys_str) {
2085 ret = -ENOMEM;
2086 goto out;
2087 }
754481e6
SRV		 2088 } else if ((str_has_prefix(str, "val=")) ||
2089 (str_has_prefix(str, "vals=")) ||
2090 (str_has_prefix(str, "values="))) {
9b1ae035
TZ		 2091 attrs->vals_str = kstrdup(str, GFP_KERNEL);
2092 if (!attrs->vals_str) {
2093 ret = -ENOMEM;
2094 goto out;
2095 }
754481e6 2096 } else if (str_has_prefix(str, "sort=")) {
9b1ae035
TZ		 2097 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
2098 if (!attrs->sort_key_str) {
2099 ret = -ENOMEM;
2100 goto out;
2101 }
754481e6 2102 } else if (str_has_prefix(str, "name=")) {
9b1ae035
TZ		 2103 attrs->name = kstrdup(str, GFP_KERNEL);
2104 if (!attrs->name) {
2105 ret = -ENOMEM;
2106 goto out;
2107 }
754481e6 2108 } else if (str_has_prefix(str, "clock=")) {
a4072fe8
TZ		 2109 strsep(&str, "=");
2110 if (!str) {
2111 ret = -EINVAL;
2112 goto out;
2113 }
2114
2115 str = strstrip(str);
2116 attrs->clock = kstrdup(str, GFP_KERNEL);
2117 if (!attrs->clock) {
2118 ret = -ENOMEM;
2119 goto out;
2120 }
754481e6 2121 } else if (str_has_prefix(str, "size=")) {
9b1ae035
TZ		 2122 int map_bits = parse_map_size(str);
2123
2124 if (map_bits < 0) {
2125 ret = map_bits;
2126 goto out;
2127 }
2128 attrs->map_bits = map_bits;
30350d65
TZ		 2129 } else {
2130 char *assignment;
2131
2132 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
d0cd871b 2133 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
30350d65
TZ		 2134 ret = -EINVAL;
2135 goto out;
2136 }
2137
2138 assignment = kstrdup(str, GFP_KERNEL);
2139 if (!assignment) {
2140 ret = -ENOMEM;
2141 goto out;
2142 }
2143
2144 attrs->assignment_str[attrs->n_assignments++] = assignment;
2145 }
9b1ae035
TZ		 2146 out:
2147 return ret;
2148}
2149
d0cd871b
SRV		 2150static struct hist_trigger_attrs *
2151parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
7ef224d1
TZ		 2152{
2153 struct hist_trigger_attrs *attrs;
2154 int ret = 0;
2155
2156 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
2157 if (!attrs)
2158 return ERR_PTR(-ENOMEM);
2159
2160 while (trigger_str) {
2161 char *str = strsep(&trigger_str, ":");
2162
9b1ae035 2163 if (strchr(str, '=')) {
d0cd871b 2164 ret = parse_assignment(tr, str, attrs);
9b1ae035
TZ		 2165 if (ret)
2166 goto free;
2167 } else if (strcmp(str, "pause") == 0)
83e99914
TZ		 2168 attrs->pause = true;
2169 else if ((strcmp(str, "cont") == 0) ||
2170 (strcmp(str, "continue") == 0))
2171 attrs->cont = true;
e86ae9ba
TZ		 2172 else if (strcmp(str, "clear") == 0)
2173 attrs->clear = true;
9b1ae035 2174 else {
0212e2aa
TZ		 2175 ret = parse_action(str, attrs);
2176 if (ret)
2177 goto free;
7ef224d1
TZ		 2178 }
2179 }
2180
2181 if (!attrs->keys_str) {
2182 ret = -EINVAL;
2183 goto free;
2184 }
2185
a4072fe8
TZ		 2186 if (!attrs->clock) {
2187 attrs->clock = kstrdup("global", GFP_KERNEL);
2188 if (!attrs->clock) {
2189 ret = -ENOMEM;
2190 goto free;
2191 }
2192 }
2193
7ef224d1
TZ		 2194 return attrs;
2195 free:
2196 destroy_hist_trigger_attrs(attrs);
2197
2198 return ERR_PTR(ret);
2199}
2200
6b4827ad
TZ		 2201static inline void save_comm(char *comm, struct task_struct *task)
2202{
2203 if (!task->pid) {
2204 strcpy(comm, "<idle>");
2205 return;
2206 }
2207
2208 if (WARN_ON_ONCE(task->pid < 0)) {
2209 strcpy(comm, "<XXX>");
2210 return;
2211 }
2212
27242c62 2213 strncpy(comm, task->comm, TASK_COMM_LEN);
6b4827ad
TZ		 2214}
2215
af6a29bc
TZ		 2216static void hist_elt_data_free(struct hist_elt_data *elt_data)
2217{
02205a67
TZ		 2218 unsigned int i;
2219
2220 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
2221 kfree(elt_data->field_var_str[i]);
2222
af6a29bc
TZ		 2223 kfree(elt_data->comm);
2224 kfree(elt_data);
2225}
2226
2227static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
6b4827ad 2228{
af6a29bc
TZ		 2229 struct hist_elt_data *elt_data = elt->private_data;
2230
2231 hist_elt_data_free(elt_data);
6b4827ad
TZ		 2232}
2233
af6a29bc 2234static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
6b4827ad
TZ		 2235{
2236 struct hist_trigger_data *hist_data = elt->map->private_data;
af6a29bc
TZ		 2237 unsigned int size = TASK_COMM_LEN;
2238 struct hist_elt_data *elt_data;
6b4827ad 2239 struct hist_field *key_field;
02205a67 2240 unsigned int i, n_str;
6b4827ad 2241
af6a29bc
TZ		 2242 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
2243 if (!elt_data)
2244 return -ENOMEM;
2245
6b4827ad
TZ		 2246 for_each_hist_key_field(i, hist_data) {
2247 key_field = hist_data->fields[i];
2248
2249 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 2250 elt_data->comm = kzalloc(size, GFP_KERNEL);
2251 if (!elt_data->comm) {
2252 kfree(elt_data);
6b4827ad 2253 return -ENOMEM;
af6a29bc 2254 }
6b4827ad
TZ		 2255 break;
2256 }
2257 }
2258
7d18a10c 2259 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
02205a67
TZ		 2260
2261 size = STR_VAR_LEN_MAX;
2262
2263 for (i = 0; i < n_str; i++) {
2264 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
2265 if (!elt_data->field_var_str[i]) {
2266 hist_elt_data_free(elt_data);
2267 return -ENOMEM;
2268 }
2269 }
2270
af6a29bc
TZ		 2271 elt->private_data = elt_data;
2272
6b4827ad
TZ		 2273 return 0;
2274}
2275
af6a29bc 2276static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
6b4827ad 2277{
af6a29bc 2278 struct hist_elt_data *elt_data = elt->private_data;
6b4827ad 2279
af6a29bc
TZ		 2280 if (elt_data->comm)
2281 save_comm(elt_data->comm, current);
6b4827ad
TZ		 2282}
2283
af6a29bc
TZ		 2284static const struct tracing_map_ops hist_trigger_elt_data_ops = {
2285 .elt_alloc = hist_trigger_elt_data_alloc,
2286 .elt_free = hist_trigger_elt_data_free,
2287 .elt_init = hist_trigger_elt_data_init,
6b4827ad
TZ		 2288};
2289
2ece94fb
TZ		 2290static const char *get_hist_field_flags(struct hist_field *hist_field)
2291{
2292 const char *flags_str = NULL;
2293
2294 if (hist_field->flags & HIST_FIELD_FL_HEX)
2295 flags_str = "hex";
2296 else if (hist_field->flags & HIST_FIELD_FL_SYM)
2297 flags_str = "sym";
2298 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
2299 flags_str = "sym-offset";
2300 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
2301 flags_str = "execname";
2302 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
2303 flags_str = "syscall";
2304 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
2305 flags_str = "log2";
2306 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2307 flags_str = "usecs";
2308
2309 return flags_str;
2310}
2311
100719dc
TZ		 2312static void expr_field_str(struct hist_field *field, char *expr)
2313{
067fe038
TZ		 2314 if (field->flags & HIST_FIELD_FL_VAR_REF)
2315 strcat(expr, "$");
2316
100719dc
TZ		 2317 strcat(expr, hist_field_name(field, 0));
2318
76690945 2319 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
100719dc
TZ		 2320 const char *flags_str = get_hist_field_flags(field);
2321
2322 if (flags_str) {
2323 strcat(expr, ".");
2324 strcat(expr, flags_str);
2325 }
2326 }
2327}
2328
2329static char *expr_str(struct hist_field *field, unsigned int level)
2330{
2331 char *expr;
2332
2333 if (level > 1)
2334 return NULL;
2335
2336 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2337 if (!expr)
2338 return NULL;
2339
2340 if (!field->operands[0]) {
2341 expr_field_str(field, expr);
2342 return expr;
2343 }
2344
2345 if (field->operator == FIELD_OP_UNARY_MINUS) {
2346 char *subexpr;
2347
2348 strcat(expr, "-(");
2349 subexpr = expr_str(field->operands[0], ++level);
2350 if (!subexpr) {
2351 kfree(expr);
2352 return NULL;
2353 }
2354 strcat(expr, subexpr);
2355 strcat(expr, ")");
2356
2357 kfree(subexpr);
2358
2359 return expr;
2360 }
2361
2362 expr_field_str(field->operands[0], expr);
2363
2364 switch (field->operator) {
2365 case FIELD_OP_MINUS:
2366 strcat(expr, "-");
2367 break;
2368 case FIELD_OP_PLUS:
2369 strcat(expr, "+");
2370 break;
2371 default:
2372 kfree(expr);
2373 return NULL;
2374 }
2375
2376 expr_field_str(field->operands[1], expr);
2377
2378 return expr;
2379}
2380
2381static int contains_operator(char *str)
2382{
2383 enum field_op_id field_op = FIELD_OP_NONE;
2384 char *op;
2385
2386 op = strpbrk(str, "+-");
2387 if (!op)
2388 return FIELD_OP_NONE;
2389
2390 switch (*op) {
2391 case '-':
2392 if (*str == '-')
2393 field_op = FIELD_OP_UNARY_MINUS;
2394 else
2395 field_op = FIELD_OP_MINUS;
2396 break;
2397 case '+':
2398 field_op = FIELD_OP_PLUS;
2399 break;
2400 default:
2401 break;
2402 }
2403
2404 return field_op;
2405}
2406
656fe2ba
TZ		 2407static void __destroy_hist_field(struct hist_field *hist_field)
2408{
2409 kfree(hist_field->var.name);
2410 kfree(hist_field->name);
2411 kfree(hist_field->type);
2412
2413 kfree(hist_field);
2414}
2415
5819eadd
TZ		 2416static void destroy_hist_field(struct hist_field *hist_field,
2417 unsigned int level)
7ef224d1 2418{
5819eadd
TZ		 2419 unsigned int i;
2420
100719dc 2421 if (level > 3)
5819eadd
TZ		 2422 return;
2423
2424 if (!hist_field)
2425 return;
2426
656fe2ba
TZ		 2427 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
2428 return; /* var refs will be destroyed separately */
2429
5819eadd
TZ		 2430 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
2431 destroy_hist_field(hist_field->operands[i], level + 1);
2432
656fe2ba 2433 __destroy_hist_field(hist_field);
7ef224d1
TZ		 2434}
2435
b559d003
TZ		 2436static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
2437 struct ftrace_event_field *field,
30350d65
TZ		 2438 unsigned long flags,
2439 char *var_name)
7ef224d1
TZ		 2440{
2441 struct hist_field *hist_field;
2442
2443 if (field && is_function_field(field))
2444 return NULL;
2445
2446 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2447 if (!hist_field)
2448 return NULL;
2449
b559d003
TZ		 2450 hist_field->hist_data = hist_data;
2451
7e8b88a3 2452 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
100719dc
TZ		 2453 goto out; /* caller will populate */
2454
067fe038
TZ		 2455 if (flags & HIST_FIELD_FL_VAR_REF) {
2456 hist_field->fn = hist_field_var_ref;
2457 goto out;
2458 }
2459
7ef224d1
TZ		 2460 if (flags & HIST_FIELD_FL_HITCOUNT) {
2461 hist_field->fn = hist_field_counter;
19a9facd
TZ		 2462 hist_field->size = sizeof(u64);
2463 hist_field->type = kstrdup("u64", GFP_KERNEL);
2464 if (!hist_field->type)
2465 goto free;
7ef224d1
TZ		 2466 goto out;
2467 }
2468
69a0200c
TZ		 2469 if (flags & HIST_FIELD_FL_STACKTRACE) {
2470 hist_field->fn = hist_field_none;
2471 goto out;
2472 }
2473
4b94f5b7 2474 if (flags & HIST_FIELD_FL_LOG2) {
5819eadd 2475 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
4b94f5b7 2476 hist_field->fn = hist_field_log2;
30350d65 2477 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
5819eadd 2478 hist_field->size = hist_field->operands[0]->size;
19a9facd
TZ		 2479 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
2480 if (!hist_field->type)
2481 goto free;
4b94f5b7
NK		 2482 goto out;
2483 }
2484
ad42febe
TZ		 2485 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2486 hist_field->fn = hist_field_timestamp;
2487 hist_field->size = sizeof(u64);
19a9facd
TZ		 2488 hist_field->type = kstrdup("u64", GFP_KERNEL);
2489 if (!hist_field->type)
2490 goto free;
ad42febe
TZ		 2491 goto out;
2492 }
2493
8b7622bf
TZ		 2494 if (flags & HIST_FIELD_FL_CPU) {
2495 hist_field->fn = hist_field_cpu;
2496 hist_field->size = sizeof(int);
2497 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
2498 if (!hist_field->type)
2499 goto free;
2500 goto out;
2501 }
2502
432480c5
TZ		 2503 if (WARN_ON_ONCE(!field))
2504 goto out;
2505
7ef224d1
TZ		 2506 if (is_string_field(field)) {
2507 flags |= HIST_FIELD_FL_STRING;
79e577cb 2508
19a9facd
TZ		 2509 hist_field->size = MAX_FILTER_STR_VAL;
2510 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2511 if (!hist_field->type)
2512 goto free;
2513
79e577cb
NK		 2514 if (field->filter_type == FILTER_STATIC_STRING)
2515 hist_field->fn = hist_field_string;
2516 else if (field->filter_type == FILTER_DYN_STRING)
2517 hist_field->fn = hist_field_dynstring;
2518 else
2519 hist_field->fn = hist_field_pstring;
7ef224d1 2520 } else {
19a9facd
TZ		 2521 hist_field->size = field->size;
2522 hist_field->is_signed = field->is_signed;
2523 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2524 if (!hist_field->type)
2525 goto free;
2526
7ef224d1
TZ		 2527 hist_field->fn = select_value_fn(field->size,
2528 field->is_signed);
2529 if (!hist_field->fn) {
5819eadd 2530 destroy_hist_field(hist_field, 0);
7ef224d1
TZ		 2531 return NULL;
2532 }
2533 }
2534 out:
2535 hist_field->field = field;
2536 hist_field->flags = flags;
2537
30350d65
TZ		 2538 if (var_name) {
2539 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2540 if (!hist_field->var.name)
2541 goto free;
2542 }
2543
7ef224d1 2544 return hist_field;
30350d65
TZ		 2545 free:
2546 destroy_hist_field(hist_field, 0);
2547 return NULL;
7ef224d1
TZ		 2548}
2549
2550static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2551{
2552 unsigned int i;
2553
30350d65 2554 for (i = 0; i < HIST_FIELDS_MAX; i++) {
7ef224d1 2555 if (hist_data->fields[i]) {
5819eadd 2556 destroy_hist_field(hist_data->fields[i], 0);
7ef224d1
TZ		 2557 hist_data->fields[i] = NULL;
2558 }
2559 }
656fe2ba
TZ		 2560
2561 for (i = 0; i < hist_data->n_var_refs; i++) {
2562 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2563 __destroy_hist_field(hist_data->var_refs[i]);
2564 hist_data->var_refs[i] = NULL;
2565 }
7ef224d1
TZ		 2566}
2567
067fe038
TZ		 2568static int init_var_ref(struct hist_field *ref_field,
2569 struct hist_field *var_field,
2570 char *system, char *event_name)
2571{
2572 int err = 0;
2573
2574 ref_field->var.idx = var_field->var.idx;
2575 ref_field->var.hist_data = var_field->hist_data;
2576 ref_field->size = var_field->size;
2577 ref_field->is_signed = var_field->is_signed;
2578 ref_field->flags |= var_field->flags &
2579 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2580
2581 if (system) {
2582 ref_field->system = kstrdup(system, GFP_KERNEL);
2583 if (!ref_field->system)
2584 return -ENOMEM;
2585 }
2586
2587 if (event_name) {
2588 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2589 if (!ref_field->event_name) {
2590 err = -ENOMEM;
2591 goto free;
2592 }
2593 }
2594
7e8b88a3
TZ		 2595 if (var_field->var.name) {
2596 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2597 if (!ref_field->name) {
2598 err = -ENOMEM;
2599 goto free;
2600 }
2601 } else if (var_field->name) {
2602 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2603 if (!ref_field->name) {
2604 err = -ENOMEM;
2605 goto free;
2606 }
067fe038
TZ		 2607 }
2608
2609 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
2610 if (!ref_field->type) {
2611 err = -ENOMEM;
2612 goto free;
2613 }
2614 out:
2615 return err;
2616 free:
2617 kfree(ref_field->system);
2618 kfree(ref_field->event_name);
2619 kfree(ref_field->name);
2620
2621 goto out;
2622}
2623
de40f033
TZ		 2624/**
2625 * create_var_ref - Create a variable reference and attach it to trigger
2626 * @hist_data: The trigger that will be referencing the variable
2627 * @var_field: The VAR field to create a reference to
2628 * @system: The optional system string
2629 * @event_name: The optional event_name string
2630 *
2631 * Given a variable hist_field, create a VAR_REF hist_field that
2632 * represents a reference to it.
2633 *
2634 * This function also adds the reference to the trigger that
2635 * now references the variable.
2636 *
2637 * Return: The VAR_REF field if successful, NULL if not
2638 */
2639static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2640 struct hist_field *var_field,
067fe038
TZ		 2641 char *system, char *event_name)
2642{
2643 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2644 struct hist_field *ref_field;
2645
2646 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2647 if (ref_field) {
2648 if (init_var_ref(ref_field, var_field, system, event_name)) {
2649 destroy_hist_field(ref_field, 0);
2650 return NULL;
2651 }
de40f033
TZ		 2652
2653 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2654 ref_field->var_ref_idx = hist_data->n_var_refs++;
067fe038
TZ		 2655 }
2656
2657 return ref_field;
2658}
2659
2660static bool is_var_ref(char *var_name)
2661{
2662 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2663 return false;
2664
2665 return true;
2666}
2667
2668static char *field_name_from_var(struct hist_trigger_data *hist_data,
2669 char *var_name)
2670{
2671 char *name, *field;
2672 unsigned int i;
2673
2674 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2675 name = hist_data->attrs->var_defs.name[i];
2676
2677 if (strcmp(var_name, name) == 0) {
2678 field = hist_data->attrs->var_defs.expr[i];
2679 if (contains_operator(field) || is_var_ref(field))
2680 continue;
2681 return field;
2682 }
2683 }
2684
2685 return NULL;
2686}
2687
2688static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2689 char *system, char *event_name,
2690 char *var_name)
2691{
2692 struct trace_event_call *call;
2693
2694 if (system && event_name) {
2695 call = hist_data->event_file->event_call;
2696
2697 if (strcmp(system, call->class->system) != 0)
2698 return NULL;
2699
2700 if (strcmp(event_name, trace_event_name(call)) != 0)
2701 return NULL;
2702 }
2703
2704 if (!!system != !!event_name)
2705 return NULL;
2706
2707 if (!is_var_ref(var_name))
2708 return NULL;
2709
2710 var_name++;
2711
2712 return field_name_from_var(hist_data, var_name);
2713}
2714
2715static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2716 char *system, char *event_name,
2717 char *var_name)
2718{
2719 struct hist_field *var_field = NULL, *ref_field = NULL;
d0cd871b 2720 struct trace_array *tr = hist_data->event_file->tr;
067fe038
TZ		 2721
2722 if (!is_var_ref(var_name))
2723 return NULL;
2724
2725 var_name++;
2726
2727 var_field = find_event_var(hist_data, system, event_name, var_name);
2728 if (var_field)
de40f033
TZ		 2729 ref_field = create_var_ref(hist_data, var_field,
2730 system, event_name);
067fe038 2731
f404da6e 2732 if (!ref_field)
d0cd871b 2733 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
f404da6e 2734
067fe038
TZ		 2735 return ref_field;
2736}
2737
100719dc
TZ		 2738static struct ftrace_event_field *
2739parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2740 char *field_str, unsigned long *flags)
2741{
2742 struct ftrace_event_field *field = NULL;
2743 char *field_name, *modifier, *str;
d0cd871b 2744 struct trace_array *tr = file->tr;
100719dc
TZ		 2745
2746 modifier = str = kstrdup(field_str, GFP_KERNEL);
2747 if (!modifier)
2748 return ERR_PTR(-ENOMEM);
2749
2750 field_name = strsep(&modifier, ".");
2751 if (modifier) {
2752 if (strcmp(modifier, "hex") == 0)
2753 *flags |= HIST_FIELD_FL_HEX;
2754 else if (strcmp(modifier, "sym") == 0)
2755 *flags |= HIST_FIELD_FL_SYM;
2756 else if (strcmp(modifier, "sym-offset") == 0)
2757 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2758 else if ((strcmp(modifier, "execname") == 0) &&
2759 (strcmp(field_name, "common_pid") == 0))
2760 *flags |= HIST_FIELD_FL_EXECNAME;
2761 else if (strcmp(modifier, "syscall") == 0)
2762 *flags |= HIST_FIELD_FL_SYSCALL;
2763 else if (strcmp(modifier, "log2") == 0)
2764 *flags |= HIST_FIELD_FL_LOG2;
2765 else if (strcmp(modifier, "usecs") == 0)
2766 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2767 else {
d0cd871b 2768 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
100719dc
TZ		 2769 field = ERR_PTR(-EINVAL);
2770 goto out;
2771 }
2772 }
2773
2774 if (strcmp(field_name, "common_timestamp") == 0) {
2775 *flags |= HIST_FIELD_FL_TIMESTAMP;
2776 hist_data->enable_timestamps = true;
2777 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2778 hist_data->attrs->ts_in_usecs = true;
8b7622bf
TZ		 2779 } else if (strcmp(field_name, "cpu") == 0)
2780 *flags |= HIST_FIELD_FL_CPU;
2781 else {
100719dc
TZ		 2782 field = trace_find_event_field(file->event_call, field_name);
2783 if (!field || !field->size) {
d0cd871b 2784 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
100719dc
TZ		 2785 field = ERR_PTR(-EINVAL);
2786 goto out;
2787 }
2788 }
2789 out:
2790 kfree(str);
2791
2792 return field;
2793}
2794
7e8b88a3
TZ		 2795static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2796 struct hist_field *var_ref,
2797 char *var_name)
2798{
2799 struct hist_field *alias = NULL;
2800 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2801
2802 alias = create_hist_field(hist_data, NULL, flags, var_name);
2803 if (!alias)
2804 return NULL;
2805
2806 alias->fn = var_ref->fn;
2807 alias->operands[0] = var_ref;
2808
2809 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2810 destroy_hist_field(alias, 0);
2811 return NULL;
2812 }
2813
17f8607a
TZ		 2814 alias->var_ref_idx = var_ref->var_ref_idx;
2815
7e8b88a3
TZ		 2816 return alias;
2817}
2818
100719dc
TZ		 2819static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2820 struct trace_event_file *file, char *str,
2821 unsigned long *flags, char *var_name)
2822{
067fe038 2823 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
100719dc
TZ		 2824 struct ftrace_event_field *field = NULL;
2825 struct hist_field *hist_field = NULL;
2826 int ret = 0;
2827
067fe038
TZ		 2828 s = strchr(str, '.');
2829 if (s) {
2830 s = strchr(++s, '.');
2831 if (s) {
2832 ref_system = strsep(&str, ".");
2833 if (!str) {
2834 ret = -EINVAL;
2835 goto out;
2836 }
2837 ref_event = strsep(&str, ".");
2838 if (!str) {
2839 ret = -EINVAL;
2840 goto out;
2841 }
2842 ref_var = str;
2843 }
2844 }
2845
2846 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2847 if (!s) {
d0cd871b
SRV		 2848 hist_field = parse_var_ref(hist_data, ref_system,
2849 ref_event, ref_var);
067fe038 2850 if (hist_field) {
7e8b88a3
TZ		 2851 if (var_name) {
2852 hist_field = create_alias(hist_data, hist_field, var_name);
2853 if (!hist_field) {
2854 ret = -ENOMEM;
2855 goto out;
2856 }
2857 }
067fe038
TZ		 2858 return hist_field;
2859 }
2860 } else
2861 str = s;
2862
100719dc
TZ		 2863 field = parse_field(hist_data, file, str, flags);
2864 if (IS_ERR(field)) {
2865 ret = PTR_ERR(field);
2866 goto out;
2867 }
2868
2869 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2870 if (!hist_field) {
2871 ret = -ENOMEM;
2872 goto out;
2873 }
2874
2875 return hist_field;
2876 out:
2877 return ERR_PTR(ret);
2878}
2879
2880static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2881 struct trace_event_file *file,
2882 char *str, unsigned long flags,
2883 char *var_name, unsigned int level);
2884
2885static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2886 struct trace_event_file *file,
2887 char *str, unsigned long flags,
2888 char *var_name, unsigned int level)
2889{
2890 struct hist_field *operand1, *expr = NULL;
2891 unsigned long operand_flags;
2892 int ret = 0;
2893 char *s;
2894
2895 /* we support only -(xxx) i.e. explicit parens required */
2896
2897 if (level > 3) {
d0cd871b 2898 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc
TZ		 2899 ret = -EINVAL;
2900 goto free;
2901 }
2902
2903 str++; /* skip leading '-' */
2904
2905 s = strchr(str, '(');
2906 if (s)
2907 str++;
2908 else {
2909 ret = -EINVAL;
2910 goto free;
2911 }
2912
2913 s = strrchr(str, ')');
2914 if (s)
2915 *s = '\0';
2916 else {
2917 ret = -EINVAL; /* no closing ')' */
2918 goto free;
2919 }
2920
2921 flags |= HIST_FIELD_FL_EXPR;
2922 expr = create_hist_field(hist_data, NULL, flags, var_name);
2923 if (!expr) {
2924 ret = -ENOMEM;
2925 goto free;
2926 }
2927
2928 operand_flags = 0;
2929 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2930 if (IS_ERR(operand1)) {
2931 ret = PTR_ERR(operand1);
2932 goto free;
2933 }
2934
2935 expr->flags |= operand1->flags &
2936 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2937 expr->fn = hist_field_unary_minus;
2938 expr->operands[0] = operand1;
2939 expr->operator = FIELD_OP_UNARY_MINUS;
2940 expr->name = expr_str(expr, 0);
19a9facd
TZ		 2941 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2942 if (!expr->type) {
2943 ret = -ENOMEM;
2944 goto free;
2945 }
100719dc
TZ		 2946
2947 return expr;
2948 free:
2949 destroy_hist_field(expr, 0);
2950 return ERR_PTR(ret);
2951}
2952
d0cd871b
SRV		 2953static int check_expr_operands(struct trace_array *tr,
2954 struct hist_field *operand1,
100719dc
TZ		 2955 struct hist_field *operand2)
2956{
2957 unsigned long operand1_flags = operand1->flags;
2958 unsigned long operand2_flags = operand2->flags;
2959
7e8b88a3
TZ		 2960 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2961 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2962 struct hist_field *var;
2963
2964 var = find_var_field(operand1->var.hist_data, operand1->name);
2965 if (!var)
2966 return -EINVAL;
2967 operand1_flags = var->flags;
2968 }
2969
2970 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2971 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2972 struct hist_field *var;
2973
2974 var = find_var_field(operand2->var.hist_data, operand2->name);
2975 if (!var)
2976 return -EINVAL;
2977 operand2_flags = var->flags;
2978 }
2979
100719dc 2980 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
f404da6e 2981 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
d0cd871b 2982 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
100719dc 2983 return -EINVAL;
f404da6e 2984 }
100719dc
TZ		 2985
2986 return 0;
2987}
2988
2989static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2990 struct trace_event_file *file,
2991 char *str, unsigned long flags,
2992 char *var_name, unsigned int level)
2993{
2994 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2995 unsigned long operand_flags;
2996 int field_op, ret = -EINVAL;
2997 char *sep, *operand1_str;
2998
f404da6e 2999 if (level > 3) {
d0cd871b 3000 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc 3001 return ERR_PTR(-EINVAL);
f404da6e 3002 }
100719dc
TZ		 3003
3004 field_op = contains_operator(str);
3005
3006 if (field_op == FIELD_OP_NONE)
3007 return parse_atom(hist_data, file, str, &flags, var_name);
3008
3009 if (field_op == FIELD_OP_UNARY_MINUS)
3010 return parse_unary(hist_data, file, str, flags, var_name, ++level);
3011
3012 switch (field_op) {
3013 case FIELD_OP_MINUS:
3014 sep = "-";
3015 break;
3016 case FIELD_OP_PLUS:
3017 sep = "+";
3018 break;
3019 default:
3020 goto free;
3021 }
3022
3023 operand1_str = strsep(&str, sep);
3024 if (!operand1_str || !str)
3025 goto free;
3026
3027 operand_flags = 0;
3028 operand1 = parse_atom(hist_data, file, operand1_str,
3029 &operand_flags, NULL);
3030 if (IS_ERR(operand1)) {
3031 ret = PTR_ERR(operand1);
3032 operand1 = NULL;
3033 goto free;
3034 }
3035
3036 /* rest of string could be another expression e.g. b+c in a+b+c */
3037 operand_flags = 0;
3038 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
3039 if (IS_ERR(operand2)) {
3040 ret = PTR_ERR(operand2);
3041 operand2 = NULL;
3042 goto free;
3043 }
3044
d0cd871b 3045 ret = check_expr_operands(file->tr, operand1, operand2);
100719dc
TZ		 3046 if (ret)
3047 goto free;
3048
3049 flags |= HIST_FIELD_FL_EXPR;
3050
3051 flags |= operand1->flags &
3052 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
3053
3054 expr = create_hist_field(hist_data, NULL, flags, var_name);
3055 if (!expr) {
3056 ret = -ENOMEM;
3057 goto free;
3058 }
3059
067fe038
TZ		 3060 operand1->read_once = true;
3061 operand2->read_once = true;
3062
100719dc
TZ		 3063 expr->operands[0] = operand1;
3064 expr->operands[1] = operand2;
3065 expr->operator = field_op;
3066 expr->name = expr_str(expr, 0);
19a9facd
TZ		 3067 expr->type = kstrdup(operand1->type, GFP_KERNEL);
3068 if (!expr->type) {
3069 ret = -ENOMEM;
3070 goto free;
3071 }
100719dc
TZ		 3072
3073 switch (field_op) {
3074 case FIELD_OP_MINUS:
3075 expr->fn = hist_field_minus;
3076 break;
3077 case FIELD_OP_PLUS:
3078 expr->fn = hist_field_plus;
3079 break;
3080 default:
5e4cf2bf 3081 ret = -EINVAL;
100719dc
TZ		 3082 goto free;
3083 }
3084
3085 return expr;
3086 free:
3087 destroy_hist_field(operand1, 0);
3088 destroy_hist_field(operand2, 0);
3089 destroy_hist_field(expr, 0);
3090
3091 return ERR_PTR(ret);
3092}
3093
02205a67
TZ		 3094static char *find_trigger_filter(struct hist_trigger_data *hist_data,
3095 struct trace_event_file *file)
3096{
3097 struct event_trigger_data *test;
3098
3099 list_for_each_entry_rcu(test, &file->triggers, list) {
3100 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3101 if (test->private_data == hist_data)
3102 return test->filter_str;
3103 }
3104 }
3105
3106 return NULL;
3107}
3108
3109static struct event_command trigger_hist_cmd;
3110static int event_hist_trigger_func(struct event_command *cmd_ops,
3111 struct trace_event_file *file,
3112 char *glob, char *cmd, char *param);
3113
3114static bool compatible_keys(struct hist_trigger_data *target_hist_data,
3115 struct hist_trigger_data *hist_data,
3116 unsigned int n_keys)
3117{
3118 struct hist_field *target_hist_field, *hist_field;
3119 unsigned int n, i, j;
3120
3121 if (hist_data->n_fields - hist_data->n_vals != n_keys)
3122 return false;
3123
3124 i = hist_data->n_vals;
3125 j = target_hist_data->n_vals;
3126
3127 for (n = 0; n < n_keys; n++) {
3128 hist_field = hist_data->fields[i + n];
3129 target_hist_field = target_hist_data->fields[j + n];
3130
3131 if (strcmp(hist_field->type, target_hist_field->type) != 0)
3132 return false;
3133 if (hist_field->size != target_hist_field->size)
3134 return false;
3135 if (hist_field->is_signed != target_hist_field->is_signed)
3136 return false;
3137 }
3138
3139 return true;
3140}
3141
3142static struct hist_trigger_data *
3143find_compatible_hist(struct hist_trigger_data *target_hist_data,
3144 struct trace_event_file *file)
3145{
3146 struct hist_trigger_data *hist_data;
3147 struct event_trigger_data *test;
3148 unsigned int n_keys;
3149
3150 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
3151
3152 list_for_each_entry_rcu(test, &file->triggers, list) {
3153 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3154 hist_data = test->private_data;
3155
3156 if (compatible_keys(target_hist_data, hist_data, n_keys))
3157 return hist_data;
3158 }
3159 }
3160
3161 return NULL;
3162}
3163
3164static struct trace_event_file *event_file(struct trace_array *tr,
3165 char *system, char *event_name)
3166{
3167 struct trace_event_file *file;
3168
3be4c1e5 3169 file = __find_event_file(tr, system, event_name);
02205a67
TZ		 3170 if (!file)
3171 return ERR_PTR(-EINVAL);
3172
3173 return file;
3174}
3175
3176static struct hist_field *
3177find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
3178 char *system, char *event_name, char *field_name)
3179{
3180 struct hist_field *event_var;
3181 char *synthetic_name;
3182
3183 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3184 if (!synthetic_name)
3185 return ERR_PTR(-ENOMEM);
3186
3187 strcpy(synthetic_name, "synthetic_");
3188 strcat(synthetic_name, field_name);
3189
3190 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
3191
3192 kfree(synthetic_name);
3193
3194 return event_var;
3195}
3196
3197/**
3198 * create_field_var_hist - Automatically create a histogram and var for a field
3199 * @target_hist_data: The target hist trigger
3200 * @subsys_name: Optional subsystem name
3201 * @event_name: Optional event name
3202 * @field_name: The name of the field (and the resulting variable)
3203 *
3204 * Hist trigger actions fetch data from variables, not directly from
3205 * events. However, for convenience, users are allowed to directly
3206 * specify an event field in an action, which will be automatically
3207 * converted into a variable on their behalf.
3208
3209 * If a user specifies a field on an event that isn't the event the
3210 * histogram currently being defined (the target event histogram), the
3211 * only way that can be accomplished is if a new hist trigger is
3212 * created and the field variable defined on that.
3213 *
3214 * This function creates a new histogram compatible with the target
3215 * event (meaning a histogram with the same key as the target
3216 * histogram), and creates a variable for the specified field, but
3217 * with 'synthetic_' prepended to the variable name in order to avoid
3218 * collision with normal field variables.
3219 *
3220 * Return: The variable created for the field.
3221 */
c282a386 3222static struct hist_field *
02205a67
TZ		 3223create_field_var_hist(struct hist_trigger_data *target_hist_data,
3224 char *subsys_name, char *event_name, char *field_name)
3225{
3226 struct trace_array *tr = target_hist_data->event_file->tr;
3227 struct hist_field *event_var = ERR_PTR(-EINVAL);
3228 struct hist_trigger_data *hist_data;
3229 unsigned int i, n, first = true;
3230 struct field_var_hist *var_hist;
3231 struct trace_event_file *file;
3232 struct hist_field *key_field;
3233 char *saved_filter;
3234 char *cmd;
3235 int ret;
3236
f404da6e 3237 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
d0cd871b 3238 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67 3239 return ERR_PTR(-EINVAL);
f404da6e 3240 }
02205a67
TZ		 3241
3242 file = event_file(tr, subsys_name, event_name);
3243
3244 if (IS_ERR(file)) {
d0cd871b 3245 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
02205a67
TZ		 3246 ret = PTR_ERR(file);
3247 return ERR_PTR(ret);
3248 }
3249
3250 /*
3251 * Look for a histogram compatible with target. We'll use the
3252 * found histogram specification to create a new matching
3253 * histogram with our variable on it. target_hist_data is not
3254 * yet a registered histogram so we can't use that.
3255 */
3256 hist_data = find_compatible_hist(target_hist_data, file);
f404da6e 3257 if (!hist_data) {
d0cd871b 3258 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
02205a67 3259 return ERR_PTR(-EINVAL);
f404da6e 3260 }
02205a67
TZ		 3261
3262 /* See if a synthetic field variable has already been created */
3263 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3264 event_name, field_name);
3265 if (!IS_ERR_OR_NULL(event_var))
3266 return event_var;
3267
3268 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3269 if (!var_hist)
3270 return ERR_PTR(-ENOMEM);
3271
3272 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3273 if (!cmd) {
3274 kfree(var_hist);
3275 return ERR_PTR(-ENOMEM);
3276 }
3277
3278 /* Use the same keys as the compatible histogram */
3279 strcat(cmd, "keys=");
3280
3281 for_each_hist_key_field(i, hist_data) {
3282 key_field = hist_data->fields[i];
3283 if (!first)
3284 strcat(cmd, ",");
3285 strcat(cmd, key_field->field->name);
3286 first = false;
3287 }
3288
3289 /* Create the synthetic field variable specification */
3290 strcat(cmd, ":synthetic_");
3291 strcat(cmd, field_name);
3292 strcat(cmd, "=");
3293 strcat(cmd, field_name);
3294
3295 /* Use the same filter as the compatible histogram */
3296 saved_filter = find_trigger_filter(hist_data, file);
3297 if (saved_filter) {
3298 strcat(cmd, " if ");
3299 strcat(cmd, saved_filter);
3300 }
3301
3302 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3303 if (!var_hist->cmd) {
3304 kfree(cmd);
3305 kfree(var_hist);
3306 return ERR_PTR(-ENOMEM);
3307 }
3308
3309 /* Save the compatible histogram information */
3310 var_hist->hist_data = hist_data;
3311
3312 /* Create the new histogram with our variable */
3313 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
3314 "", "hist", cmd);
3315 if (ret) {
3316 kfree(cmd);
3317 kfree(var_hist->cmd);
3318 kfree(var_hist);
d0cd871b 3319 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
02205a67
TZ		 3320 return ERR_PTR(ret);
3321 }
3322
3323 kfree(cmd);
3324
3325 /* If we can't find the variable, something went wrong */
3326 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3327 event_name, field_name);
3328 if (IS_ERR_OR_NULL(event_var)) {
3329 kfree(var_hist->cmd);
3330 kfree(var_hist);
d0cd871b 3331 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
02205a67
TZ		 3332 return ERR_PTR(-EINVAL);
3333 }
3334
3335 n = target_hist_data->n_field_var_hists;
3336 target_hist_data->field_var_hists[n] = var_hist;
3337 target_hist_data->n_field_var_hists++;
3338
3339 return event_var;
3340}
3341
c282a386 3342static struct hist_field *
02205a67
TZ		 3343find_target_event_var(struct hist_trigger_data *hist_data,
3344 char *subsys_name, char *event_name, char *var_name)
3345{
3346 struct trace_event_file *file = hist_data->event_file;
3347 struct hist_field *hist_field = NULL;
3348
3349 if (subsys_name) {
3350 struct trace_event_call *call;
3351
3352 if (!event_name)
3353 return NULL;
3354
3355 call = file->event_call;
3356
3357 if (strcmp(subsys_name, call->class->system) != 0)
3358 return NULL;
3359
3360 if (strcmp(event_name, trace_event_name(call)) != 0)
3361 return NULL;
3362 }
3363
3364 hist_field = find_var_field(hist_data, var_name);
3365
3366 return hist_field;
3367}
3368
3369static inline void __update_field_vars(struct tracing_map_elt *elt,
3370 struct ring_buffer_event *rbe,
3371 void *rec,
3372 struct field_var **field_vars,
3373 unsigned int n_field_vars,
3374 unsigned int field_var_str_start)
3375{
3376 struct hist_elt_data *elt_data = elt->private_data;
3377 unsigned int i, j, var_idx;
3378 u64 var_val;
3379
3380 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3381 struct field_var *field_var = field_vars[i];
3382 struct hist_field *var = field_var->var;
3383 struct hist_field *val = field_var->val;
3384
3385 var_val = val->fn(val, elt, rbe, rec);
3386 var_idx = var->var.idx;
3387
3388 if (val->flags & HIST_FIELD_FL_STRING) {
3389 char *str = elt_data->field_var_str[j++];
3390 char *val_str = (char *)(uintptr_t)var_val;
3391
ad452870 3392 strscpy(str, val_str, STR_VAR_LEN_MAX);
02205a67
TZ		 3393 var_val = (u64)(uintptr_t)str;
3394 }
3395 tracing_map_set_var(elt, var_idx, var_val);
3396 }
3397}
3398
3399static void update_field_vars(struct hist_trigger_data *hist_data,
3400 struct tracing_map_elt *elt,
3401 struct ring_buffer_event *rbe,
3402 void *rec)
3403{
3404 __update_field_vars(elt, rbe, rec, hist_data->field_vars,
3405 hist_data->n_field_vars, 0);
3406}
3407
466f4528
TZ		 3408static void save_track_data_vars(struct hist_trigger_data *hist_data,
3409 struct tracing_map_elt *elt, void *rec,
3410 struct ring_buffer_event *rbe, void *key,
3411 struct action_data *data, u64 *var_ref_vals)
50450603 3412{
7d18a10c
TZ		 3413 __update_field_vars(elt, rbe, rec, hist_data->save_vars,
3414 hist_data->n_save_vars, hist_data->n_field_var_str);
50450603
TZ		 3415}
3416
02205a67
TZ		 3417static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3418 struct trace_event_file *file,
3419 char *name, int size, const char *type)
3420{
3421 struct hist_field *var;
3422 int idx;
3423
3424 if (find_var(hist_data, file, name) && !hist_data->remove) {
3425 var = ERR_PTR(-EINVAL);
3426 goto out;
3427 }
3428
3429 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3430 if (!var) {
3431 var = ERR_PTR(-ENOMEM);
3432 goto out;
3433 }
3434
3435 idx = tracing_map_add_var(hist_data->map);
3436 if (idx < 0) {
3437 kfree(var);
3438 var = ERR_PTR(-EINVAL);
3439 goto out;
3440 }
3441
3442 var->flags = HIST_FIELD_FL_VAR;
3443 var->var.idx = idx;
3444 var->var.hist_data = var->hist_data = hist_data;
3445 var->size = size;
3446 var->var.name = kstrdup(name, GFP_KERNEL);
3447 var->type = kstrdup(type, GFP_KERNEL);
3448 if (!var->var.name || !var->type) {
3449 kfree(var->var.name);
3450 kfree(var->type);
3451 kfree(var);
3452 var = ERR_PTR(-ENOMEM);
3453 }
3454 out:
3455 return var;
3456}
3457
3458static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3459 struct trace_event_file *file,
3460 char *field_name)
3461{
3462 struct hist_field *val = NULL, *var = NULL;
3463 unsigned long flags = HIST_FIELD_FL_VAR;
d0cd871b 3464 struct trace_array *tr = file->tr;
02205a67
TZ		 3465 struct field_var *field_var;
3466 int ret = 0;
3467
3468 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
d0cd871b 3469 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67
TZ		 3470 ret = -EINVAL;
3471 goto err;
3472 }
3473
3474 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3475 if (IS_ERR(val)) {
d0cd871b 3476 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
02205a67
TZ		 3477 ret = PTR_ERR(val);
3478 goto err;
3479 }
3480
3481 var = create_var(hist_data, file, field_name, val->size, val->type);
3482 if (IS_ERR(var)) {
d0cd871b 3483 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
02205a67
TZ		 3484 kfree(val);
3485 ret = PTR_ERR(var);
3486 goto err;
3487 }
3488
3489 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3490 if (!field_var) {
3491 kfree(val);
3492 kfree(var);
3493 ret = -ENOMEM;
3494 goto err;
3495 }
3496
3497 field_var->var = var;
3498 field_var->val = val;
3499 out:
3500 return field_var;
3501 err:
3502 field_var = ERR_PTR(ret);
3503 goto out;
3504}
3505
3506/**
3507 * create_target_field_var - Automatically create a variable for a field
3508 * @target_hist_data: The target hist trigger
3509 * @subsys_name: Optional subsystem name
3510 * @event_name: Optional event name
3511 * @var_name: The name of the field (and the resulting variable)
3512 *
3513 * Hist trigger actions fetch data from variables, not directly from
3514 * events. However, for convenience, users are allowed to directly
3515 * specify an event field in an action, which will be automatically
3516 * converted into a variable on their behalf.
3517
3518 * This function creates a field variable with the name var_name on
3519 * the hist trigger currently being defined on the target event. If
3520 * subsys_name and event_name are specified, this function simply
3521 * verifies that they do in fact match the target event subsystem and
3522 * event name.
3523 *
3524 * Return: The variable created for the field.
3525 */
c282a386 3526static struct field_var *
02205a67
TZ		 3527create_target_field_var(struct hist_trigger_data *target_hist_data,
3528 char *subsys_name, char *event_name, char *var_name)
3529{
3530 struct trace_event_file *file = target_hist_data->event_file;
3531
3532 if (subsys_name) {
3533 struct trace_event_call *call;
3534
3535 if (!event_name)
3536 return NULL;
3537
3538 call = file->event_call;
3539
3540 if (strcmp(subsys_name, call->class->system) != 0)
3541 return NULL;
3542
3543 if (strcmp(event_name, trace_event_name(call)) != 0)
3544 return NULL;
3545 }
3546
3547 return create_field_var(target_hist_data, file, var_name);
3548}
3549
466f4528
TZ		 3550static bool check_track_val_max(u64 track_val, u64 var_val)
3551{
3552 if (var_val <= track_val)
3553 return false;
3554
3555 return true;
3556}
3557
dff81f55
TZ		 3558static bool check_track_val_changed(u64 track_val, u64 var_val)
3559{
3560 if (var_val == track_val)
3561 return false;
3562
3563 return true;
3564}
3565
466f4528
TZ		 3566static u64 get_track_val(struct hist_trigger_data *hist_data,
3567 struct tracing_map_elt *elt,
3568 struct action_data *data)
50450603 3569{
466f4528
TZ		 3570 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3571 u64 track_val;
3572
3573 track_val = tracing_map_read_var(elt, track_var_idx);
50450603 3574
466f4528
TZ		 3575 return track_val;
3576}
3577
3578static void save_track_val(struct hist_trigger_data *hist_data,
3579 struct tracing_map_elt *elt,
3580 struct action_data *data, u64 var_val)
3581{
3582 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3583
3584 tracing_map_set_var(elt, track_var_idx, var_val);
3585}
3586
3587static void save_track_data(struct hist_trigger_data *hist_data,
3588 struct tracing_map_elt *elt, void *rec,
3589 struct ring_buffer_event *rbe, void *key,
3590 struct action_data *data, u64 *var_ref_vals)
3591{
3592 if (data->track_data.save_data)
3593 data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3594}
3595
3596static bool check_track_val(struct tracing_map_elt *elt,
3597 struct action_data *data,
3598 u64 var_val)
3599{
3600 struct hist_trigger_data *hist_data;
3601 u64 track_val;
3602
3603 hist_data = data->track_data.track_var->hist_data;
3604 track_val = get_track_val(hist_data, elt, data);
3605
3606 return data->track_data.check_val(track_val, var_val);
3607}
3608
a3785b7e
TZ		 3609#ifdef CONFIG_TRACER_SNAPSHOT
3610static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3611{
3612 /* called with tr->max_lock held */
3613 struct track_data *track_data = tr->cond_snapshot->cond_data;
3614 struct hist_elt_data *elt_data, *track_elt_data;
3615 struct snapshot_context *context = cond_data;
9b2ca371 3616 struct action_data *action;
a3785b7e
TZ		 3617 u64 track_val;
3618
3619 if (!track_data)
3620 return false;
3621
9b2ca371
TZ		 3622 action = track_data->action_data;
3623
a3785b7e
TZ		 3624 track_val = get_track_val(track_data->hist_data, context->elt,
3625 track_data->action_data);
3626
9b2ca371
TZ		 3627 if (!action->track_data.check_val(track_data->track_val, track_val))
3628 return false;
3629
a3785b7e
TZ		 3630 track_data->track_val = track_val;
3631 memcpy(track_data->key, context->key, track_data->key_len);
3632
3633 elt_data = context->elt->private_data;
3634 track_elt_data = track_data->elt.private_data;
3635 if (elt_data->comm)
27242c62 3636 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
a3785b7e
TZ		 3637
3638 track_data->updated = true;
3639
3640 return true;
3641}
3642
3643static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3644 struct tracing_map_elt *elt, void *rec,
3645 struct ring_buffer_event *rbe, void *key,
3646 struct action_data *data,
3647 u64 *var_ref_vals)
3648{
3649 struct trace_event_file *file = hist_data->event_file;
3650 struct snapshot_context context;
3651
3652 context.elt = elt;
3653 context.key = key;
3654
3655 tracing_snapshot_cond(file->tr, &context);
3656}
3657
3658static void hist_trigger_print_key(struct seq_file *m,
3659 struct hist_trigger_data *hist_data,
3660 void *key,
3661 struct tracing_map_elt *elt);
3662
3663static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3664{
3665 unsigned int i;
3666
3667 if (!hist_data->n_actions)
3668 return NULL;
3669
3670 for (i = 0; i < hist_data->n_actions; i++) {
3671 struct action_data *data = hist_data->actions[i];
3672
3673 if (data->action == ACTION_SNAPSHOT)
3674 return data;
3675 }
3676
3677 return NULL;
3678}
3679
3680static void track_data_snapshot_print(struct seq_file *m,
3681 struct hist_trigger_data *hist_data)
3682{
3683 struct trace_event_file *file = hist_data->event_file;
3684 struct track_data *track_data;
3685 struct action_data *action;
3686
3687 track_data = tracing_cond_snapshot_data(file->tr);
3688 if (!track_data)
3689 return;
3690
3691 if (!track_data->updated)
3692 return;
3693
3694 action = snapshot_action(hist_data);
3695 if (!action)
3696 return;
3697
3698 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3699 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3700 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3701 action->track_data.var_str, track_data->track_val);
3702
3703 seq_puts(m, "\ttriggered by event with key: ");
3704 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3705 seq_putc(m, '\n');
3706}
3707#else
3708static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3709{
3710 return false;
3711}
3712static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3713 struct tracing_map_elt *elt, void *rec,
3714 struct ring_buffer_event *rbe, void *key,
3715 struct action_data *data,
3716 u64 *var_ref_vals) {}
3717static void track_data_snapshot_print(struct seq_file *m,
3718 struct hist_trigger_data *hist_data) {}
3719#endif /* CONFIG_TRACER_SNAPSHOT */
3720
466f4528
TZ		 3721static void track_data_print(struct seq_file *m,
3722 struct hist_trigger_data *hist_data,
3723 struct tracing_map_elt *elt,
3724 struct action_data *data)
3725{
3726 u64 track_val = get_track_val(hist_data, elt, data);
3727 unsigned int i, save_var_idx;
3728
3729 if (data->handler == HANDLER_ONMAX)
3730 seq_printf(m, "\n\tmax: %10llu", track_val);
dff81f55
TZ		 3731 else if (data->handler == HANDLER_ONCHANGE)
3732 seq_printf(m, "\n\tchanged: %10llu", track_val);
50450603 3733
a3785b7e
TZ		 3734 if (data->action == ACTION_SNAPSHOT)
3735 return;
3736
7d18a10c
TZ		 3737 for (i = 0; i < hist_data->n_save_vars; i++) {
3738 struct hist_field *save_val = hist_data->save_vars[i]->val;
3739 struct hist_field *save_var = hist_data->save_vars[i]->var;
50450603
TZ		 3740 u64 val;
3741
3742 save_var_idx = save_var->var.idx;
3743
3744 val = tracing_map_read_var(elt, save_var_idx);
3745
3746 if (save_val->flags & HIST_FIELD_FL_STRING) {
3747 seq_printf(m, " %s: %-32s", save_var->var.name,
3748 (char *)(uintptr_t)(val));
3749 } else
3750 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3751 }
3752}
3753
466f4528
TZ		 3754static void ontrack_action(struct hist_trigger_data *hist_data,
3755 struct tracing_map_elt *elt, void *rec,
3756 struct ring_buffer_event *rbe, void *key,
3757 struct action_data *data, u64 *var_ref_vals)
50450603 3758{
466f4528 3759 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
50450603 3760
466f4528
TZ		 3761 if (check_track_val(elt, data, var_val)) {
3762 save_track_val(hist_data, elt, data, var_val);
3763 save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3764 }
50450603
TZ		 3765}
3766
c3e49506 3767static void action_data_destroy(struct action_data *data)
50450603
TZ		 3768{
3769 unsigned int i;
3770
c3e49506 3771 lockdep_assert_held(&event_mutex);
50450603 3772
7d18a10c 3773 kfree(data->action_name);
50450603
TZ		 3774
3775 for (i = 0; i < data->n_params; i++)
3776 kfree(data->params[i]);
3777
c3e49506
TZ		 3778 if (data->synth_event)
3779 data->synth_event->ref--;
3780
e91eefd7
TZ		 3781 kfree(data->synth_event_name);
3782
50450603
TZ		 3783 kfree(data);
3784}
3785
466f4528
TZ		 3786static void track_data_destroy(struct hist_trigger_data *hist_data,
3787 struct action_data *data)
c3e49506 3788{
a3785b7e
TZ		 3789 struct trace_event_file *file = hist_data->event_file;
3790
466f4528 3791 destroy_hist_field(data->track_data.track_var, 0);
c3e49506 3792
a3785b7e
TZ		 3793 if (data->action == ACTION_SNAPSHOT) {
3794 struct track_data *track_data;
3795
3796 track_data = tracing_cond_snapshot_data(file->tr);
3797 if (track_data && track_data->hist_data == hist_data) {
3798 tracing_snapshot_cond_disable(file->tr);
3799 track_data_free(track_data);
3800 }
3801 }
3802
466f4528 3803 kfree(data->track_data.var_str);
c3e49506
TZ		 3804
3805 action_data_destroy(data);
3806}
3807
7d18a10c
TZ		 3808static int action_create(struct hist_trigger_data *hist_data,
3809 struct action_data *data);
3810
466f4528
TZ		 3811static int track_data_create(struct hist_trigger_data *hist_data,
3812 struct action_data *data)
50450603 3813{
466f4528 3814 struct hist_field *var_field, *ref_field, *track_var = NULL;
50450603 3815 struct trace_event_file *file = hist_data->event_file;
d0cd871b 3816 struct trace_array *tr = file->tr;
466f4528 3817 char *track_data_var_str;
50450603
TZ		 3818 int ret = 0;
3819
466f4528
TZ		 3820 track_data_var_str = data->track_data.var_str;
3821 if (track_data_var_str[0] != '$') {
d0cd871b 3822 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
50450603 3823 return -EINVAL;
f404da6e 3824 }
466f4528 3825 track_data_var_str++;
50450603 3826
466f4528 3827 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
f404da6e 3828 if (!var_field) {
d0cd871b 3829 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
50450603 3830 return -EINVAL;
f404da6e 3831 }
50450603 3832
de40f033 3833 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
50450603
TZ		 3834 if (!ref_field)
3835 return -ENOMEM;
3836
466f4528 3837 data->track_data.var_ref = ref_field;
50450603 3838
466f4528
TZ		 3839 if (data->handler == HANDLER_ONMAX)
3840 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3841 if (IS_ERR(track_var)) {
d0cd871b 3842 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
466f4528 3843 ret = PTR_ERR(track_var);
50450603
TZ		 3844 goto out;
3845 }
dff81f55
TZ		 3846
3847 if (data->handler == HANDLER_ONCHANGE)
3848 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3849 if (IS_ERR(track_var)) {
d0cd871b 3850 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
dff81f55
TZ		 3851 ret = PTR_ERR(track_var);
3852 goto out;
3853 }
466f4528 3854 data->track_data.track_var = track_var;
50450603 3855
7d18a10c 3856 ret = action_create(hist_data, data);
50450603
TZ		 3857 out:
3858 return ret;
3859}
3860
d0cd871b
SRV		 3861static int parse_action_params(struct trace_array *tr, char *params,
3862 struct action_data *data)
50450603
TZ		 3863{
3864 char *param, *saved_param;
e91eefd7 3865 bool first_param = true;
50450603
TZ		 3866 int ret = 0;
3867
3868 while (params) {
7d18a10c 3869 if (data->n_params >= SYNTH_FIELDS_MAX) {
d0cd871b 3870 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
50450603 3871 goto out;
7d18a10c 3872 }
50450603
TZ		 3873
3874 param = strsep(&params, ",");
3875 if (!param) {
d0cd871b 3876 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
50450603
TZ		 3877 ret = -EINVAL;
3878 goto out;
3879 }
3880
3881 param = strstrip(param);
3882 if (strlen(param) < 2) {
d0cd871b 3883 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
50450603
TZ		 3884 ret = -EINVAL;
3885 goto out;
3886 }
3887
3888 saved_param = kstrdup(param, GFP_KERNEL);
3889 if (!saved_param) {
3890 ret = -ENOMEM;
3891 goto out;
3892 }
3893
e91eefd7
TZ		 3894 if (first_param && data->use_trace_keyword) {
3895 data->synth_event_name = saved_param;
3896 first_param = false;
3897 continue;
3898 }
3899 first_param = false;
3900
50450603
TZ		 3901 data->params[data->n_params++] = saved_param;
3902 }
3903 out:
3904 return ret;
3905}
3906
d0cd871b 3907static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
7d18a10c
TZ		 3908 enum handler_id handler)
3909{
3910 char *action_name;
3911 int ret = 0;
3912
3913 strsep(&str, ".");
3914 if (!str) {
d0cd871b 3915 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3916 ret = -EINVAL;
3917 goto out;
3918 }
3919
3920 action_name = strsep(&str, "(");
3921 if (!action_name || !str) {
d0cd871b 3922 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3923 ret = -EINVAL;
3924 goto out;
3925 }
3926
3927 if (str_has_prefix(action_name, "save")) {
3928 char *params = strsep(&str, ")");
3929
3930 if (!params) {
d0cd871b 3931 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
7d18a10c
TZ		 3932 ret = -EINVAL;
3933 goto out;
3934 }
3935
d0cd871b 3936 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3937 if (ret)
3938 goto out;
3939
3940 if (handler == HANDLER_ONMAX)
466f4528 3941 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3942 else if (handler == HANDLER_ONCHANGE)
3943 data->track_data.check_val = check_track_val_changed;
466f4528 3944 else {
d0cd871b 3945 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
466f4528
TZ		 3946 ret = -EINVAL;
3947 goto out;
3948 }
7d18a10c 3949
466f4528
TZ		 3950 data->track_data.save_data = save_track_data_vars;
3951 data->fn = ontrack_action;
7d18a10c 3952 data->action = ACTION_SAVE;
a3785b7e
TZ		 3953 } else if (str_has_prefix(action_name, "snapshot")) {
3954 char *params = strsep(&str, ")");
3955
3956 if (!str) {
d0cd871b 3957 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
a3785b7e
TZ		 3958 ret = -EINVAL;
3959 goto out;
3960 }
3961
3962 if (handler == HANDLER_ONMAX)
3963 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3964 else if (handler == HANDLER_ONCHANGE)
3965 data->track_data.check_val = check_track_val_changed;
a3785b7e 3966 else {
d0cd871b 3967 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
a3785b7e
TZ		 3968 ret = -EINVAL;
3969 goto out;
3970 }
3971
3972 data->track_data.save_data = save_track_data_snapshot;
3973 data->fn = ontrack_action;
3974 data->action = ACTION_SNAPSHOT;
7d18a10c
TZ		 3975 } else {
3976 char *params = strsep(&str, ")");
3977
e91eefd7
TZ		 3978 if (str_has_prefix(action_name, "trace"))
3979 data->use_trace_keyword = true;
3980
7d18a10c 3981 if (params) {
d0cd871b 3982 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3983 if (ret)
3984 goto out;
3985 }
3986
466f4528
TZ		 3987 if (handler == HANDLER_ONMAX)
3988 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3989 else if (handler == HANDLER_ONCHANGE)
3990 data->track_data.check_val = check_track_val_changed;
466f4528
TZ		 3991
3992 if (handler != HANDLER_ONMATCH) {
3993 data->track_data.save_data = action_trace;
3994 data->fn = ontrack_action;
3995 } else
3996 data->fn = action_trace;
3997
7d18a10c
TZ		 3998 data->action = ACTION_TRACE;
3999 }
4000
4001 data->action_name = kstrdup(action_name, GFP_KERNEL);
4002 if (!data->action_name) {
4003 ret = -ENOMEM;
4004 goto out;
4005 }
4006
4007 data->handler = handler;
4008 out:
4009 return ret;
4010}
4011
466f4528
TZ		 4012static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
4013 char *str, enum handler_id handler)
50450603 4014{
50450603
TZ		 4015 struct action_data *data;
4016 int ret = -EINVAL;
466f4528 4017 char *var_str;
50450603
TZ		 4018
4019 data = kzalloc(sizeof(*data), GFP_KERNEL);
4020 if (!data)
4021 return ERR_PTR(-ENOMEM);
4022
466f4528
TZ		 4023 var_str = strsep(&str, ")");
4024 if (!var_str || !str) {
50450603
TZ		 4025 ret = -EINVAL;
4026 goto free;
4027 }
4028
466f4528
TZ		 4029 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
4030 if (!data->track_data.var_str) {
50450603
TZ		 4031 ret = -ENOMEM;
4032 goto free;
4033 }
4034
d0cd871b 4035 ret = action_parse(hist_data->event_file->tr, str, data, handler);
7d18a10c 4036 if (ret)
50450603 4037 goto free;
50450603
TZ		 4038 out:
4039 return data;
4040 free:
466f4528 4041 track_data_destroy(hist_data, data);
50450603
TZ		 4042 data = ERR_PTR(ret);
4043 goto out;
4044}
4045
c282a386
TZ		 4046static void onmatch_destroy(struct action_data *data)
4047{
c3e49506
TZ		 4048 kfree(data->match_data.event);
4049 kfree(data->match_data.event_system);
c282a386 4050
c3e49506 4051 action_data_destroy(data);
c282a386
TZ		 4052}
4053
02205a67
TZ		 4054static void destroy_field_var(struct field_var *field_var)
4055{
4056 if (!field_var)
4057 return;
4058
4059 destroy_hist_field(field_var->var, 0);
4060 destroy_hist_field(field_var->val, 0);
4061
4062 kfree(field_var);
4063}
4064
4065static void destroy_field_vars(struct hist_trigger_data *hist_data)
4066{
4067 unsigned int i;
4068
4069 for (i = 0; i < hist_data->n_field_vars; i++)
4070 destroy_field_var(hist_data->field_vars[i]);
4071}
4072
c282a386
TZ		 4073static void save_field_var(struct hist_trigger_data *hist_data,
4074 struct field_var *field_var)
02205a67
TZ		 4075{
4076 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
4077
4078 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4079 hist_data->n_field_var_str++;
4080}
4081
c282a386 4082
c282a386
TZ		 4083static int check_synth_field(struct synth_event *event,
4084 struct hist_field *hist_field,
4085 unsigned int field_pos)
4086{
4087 struct synth_field *field;
4088
4089 if (field_pos >= event->n_fields)
4090 return -EINVAL;
4091
4092 field = event->fields[field_pos];
4093
4094 if (strcmp(field->type, hist_field->type) != 0)
4095 return -EINVAL;
4096
4097 return 0;
4098}
4099
c282a386 4100static struct hist_field *
7d18a10c
TZ		 4101trace_action_find_var(struct hist_trigger_data *hist_data,
4102 struct action_data *data,
4103 char *system, char *event, char *var)
c282a386 4104{
d0cd871b 4105 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 4106 struct hist_field *hist_field;
4107
4108 var++; /* skip '$' */
4109
4110 hist_field = find_target_event_var(hist_data, system, event, var);
4111 if (!hist_field) {
7d18a10c 4112 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4113 system = data->match_data.event_system;
4114 event = data->match_data.event;
c282a386
TZ		 4115 }
4116
4117 hist_field = find_event_var(hist_data, system, event, var);
4118 }
4119
f404da6e 4120 if (!hist_field)
d0cd871b 4121 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
f404da6e 4122
c282a386
TZ		 4123 return hist_field;
4124}
4125
4126static struct hist_field *
7d18a10c
TZ		 4127trace_action_create_field_var(struct hist_trigger_data *hist_data,
4128 struct action_data *data, char *system,
4129 char *event, char *var)
c282a386
TZ		 4130{
4131 struct hist_field *hist_field = NULL;
4132 struct field_var *field_var;
4133
4134 /*
4135 * First try to create a field var on the target event (the
4136 * currently being defined). This will create a variable for
4137 * unqualified fields on the target event, or if qualified,
4138 * target fields that have qualified names matching the target.
4139 */
4140 field_var = create_target_field_var(hist_data, system, event, var);
4141
4142 if (field_var && !IS_ERR(field_var)) {
4143 save_field_var(hist_data, field_var);
4144 hist_field = field_var->var;
4145 } else {
4146 field_var = NULL;
4147 /*
4148 * If no explicit system.event is specfied, default to
4149 * looking for fields on the onmatch(system.event.xxx)
4150 * event.
4151 */
7d18a10c 4152 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4153 system = data->match_data.event_system;
4154 event = data->match_data.event;
c282a386
TZ		 4155 }
4156
4157 /*
4158 * At this point, we're looking at a field on another
4159 * event. Because we can't modify a hist trigger on
4160 * another event to add a variable for a field, we need
4161 * to create a new trigger on that event and create the
4162 * variable at the same time.
4163 */
4164 hist_field = create_field_var_hist(hist_data, system, event, var);
4165 if (IS_ERR(hist_field))
4166 goto free;
4167 }
4168 out:
4169 return hist_field;
4170 free:
4171 destroy_field_var(field_var);
4172 hist_field = NULL;
4173 goto out;
4174}
4175
7d18a10c
TZ		 4176static int trace_action_create(struct hist_trigger_data *hist_data,
4177 struct action_data *data)
c282a386 4178{
d0cd871b 4179 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 4180 char *event_name, *param, *system = NULL;
4181 struct hist_field *hist_field, *var_ref;
4182 unsigned int i, var_ref_idx;
4183 unsigned int field_pos = 0;
4184 struct synth_event *event;
e91eefd7 4185 char *synth_event_name;
c282a386
TZ		 4186 int ret = 0;
4187
0e2b81f7
MH		 4188 lockdep_assert_held(&event_mutex);
4189
e91eefd7
TZ		 4190 if (data->use_trace_keyword)
4191 synth_event_name = data->synth_event_name;
4192 else
4193 synth_event_name = data->action_name;
4194
4195 event = find_synth_event(synth_event_name);
c282a386 4196 if (!event) {
d0cd871b 4197 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
c282a386
TZ		 4198 return -EINVAL;
4199 }
7d18a10c 4200
c282a386 4201 event->ref++;
c282a386
TZ		 4202
4203 var_ref_idx = hist_data->n_var_refs;
4204
4205 for (i = 0; i < data->n_params; i++) {
4206 char *p;
4207
4208 p = param = kstrdup(data->params[i], GFP_KERNEL);
4209 if (!param) {
4210 ret = -ENOMEM;
4211 goto err;
4212 }
4213
4214 system = strsep(&param, ".");
4215 if (!param) {
4216 param = (char *)system;
4217 system = event_name = NULL;
4218 } else {
4219 event_name = strsep(&param, ".");
4220 if (!param) {
4221 kfree(p);
4222 ret = -EINVAL;
4223 goto err;
4224 }
4225 }
4226
4227 if (param[0] == '$')
7d18a10c
TZ		 4228 hist_field = trace_action_find_var(hist_data, data,
4229 system, event_name,
4230 param);
c282a386 4231 else
7d18a10c
TZ		 4232 hist_field = trace_action_create_field_var(hist_data,
4233 data,
4234 system,
4235 event_name,
4236 param);
c282a386
TZ		 4237
4238 if (!hist_field) {
4239 kfree(p);
4240 ret = -EINVAL;
4241 goto err;
4242 }
4243
4244 if (check_synth_field(event, hist_field, field_pos) == 0) {
de40f033
TZ		 4245 var_ref = create_var_ref(hist_data, hist_field,
4246 system, event_name);
c282a386
TZ		 4247 if (!var_ref) {
4248 kfree(p);
4249 ret = -ENOMEM;
4250 goto err;
4251 }
4252
c282a386
TZ		 4253 field_pos++;
4254 kfree(p);
4255 continue;
4256 }
4257
d0cd871b 4258 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
c282a386
TZ		 4259 kfree(p);
4260 ret = -EINVAL;
4261 goto err;
4262 }
4263
4264 if (field_pos != event->n_fields) {
d0cd871b 4265 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
c282a386
TZ		 4266 ret = -EINVAL;
4267 goto err;
4268 }
4269
c3e49506
TZ		 4270 data->synth_event = event;
4271 data->var_ref_idx = var_ref_idx;
c282a386
TZ		 4272 out:
4273 return ret;
4274 err:
c282a386 4275 event->ref--;
c282a386
TZ		 4276
4277 goto out;
4278}
4279
7d18a10c
TZ		 4280static int action_create(struct hist_trigger_data *hist_data,
4281 struct action_data *data)
4282{
a3785b7e 4283 struct trace_event_file *file = hist_data->event_file;
d0cd871b 4284 struct trace_array *tr = file->tr;
a3785b7e 4285 struct track_data *track_data;
7d18a10c
TZ		 4286 struct field_var *field_var;
4287 unsigned int i;
4288 char *param;
4289 int ret = 0;
4290
4291 if (data->action == ACTION_TRACE)
4292 return trace_action_create(hist_data, data);
4293
a3785b7e
TZ		 4294 if (data->action == ACTION_SNAPSHOT) {
4295 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4296 if (IS_ERR(track_data)) {
4297 ret = PTR_ERR(track_data);
4298 goto out;
4299 }
4300
4301 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4302 cond_snapshot_update);
4303 if (ret)
4304 track_data_free(track_data);
4305
4306 goto out;
4307 }
4308
7d18a10c
TZ		 4309 if (data->action == ACTION_SAVE) {
4310 if (hist_data->n_save_vars) {
4311 ret = -EEXIST;
d0cd871b 4312 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
7d18a10c
TZ		 4313 goto out;
4314 }
4315
4316 for (i = 0; i < data->n_params; i++) {
4317 param = kstrdup(data->params[i], GFP_KERNEL);
4318 if (!param) {
4319 ret = -ENOMEM;
4320 goto out;
4321 }
4322
4323 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4324 if (IS_ERR(field_var)) {
d0cd871b
SRV		 4325 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
4326 errpos(param));
7d18a10c
TZ		 4327 ret = PTR_ERR(field_var);
4328 kfree(param);
4329 goto out;
4330 }
4331
4332 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4333 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4334 hist_data->n_save_var_str++;
4335 kfree(param);
4336 }
4337 }
4338 out:
4339 return ret;
4340}
4341
4342static int onmatch_create(struct hist_trigger_data *hist_data,
4343 struct action_data *data)
4344{
4345 return action_create(hist_data, data);
4346}
4347
c282a386
TZ		 4348static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4349{
4350 char *match_event, *match_event_system;
c282a386
TZ		 4351 struct action_data *data;
4352 int ret = -EINVAL;
4353
4354 data = kzalloc(sizeof(*data), GFP_KERNEL);
4355 if (!data)
4356 return ERR_PTR(-ENOMEM);
4357
4358 match_event = strsep(&str, ")");
f404da6e 4359 if (!match_event || !str) {
d0cd871b 4360 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
c282a386 4361 goto free;
f404da6e 4362 }
c282a386
TZ		 4363
4364 match_event_system = strsep(&match_event, ".");
f404da6e 4365 if (!match_event) {
d0cd871b 4366 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
c282a386 4367 goto free;
f404da6e 4368 }
c282a386 4369
f404da6e 4370 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
d0cd871b 4371 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
c282a386 4372 goto free;
f404da6e 4373 }
c282a386 4374
c3e49506
TZ		 4375 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4376 if (!data->match_data.event) {
c282a386
TZ		 4377 ret = -ENOMEM;
4378 goto free;
4379 }
4380
c3e49506
TZ		 4381 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4382 if (!data->match_data.event_system) {
c282a386
TZ		 4383 ret = -ENOMEM;
4384 goto free;
4385 }
4386
d0cd871b 4387 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
c282a386
TZ		 4388 if (ret)
4389 goto free;
4390 out:
4391 return data;
4392 free:
4393 onmatch_destroy(data);
4394 data = ERR_PTR(ret);
4395 goto out;
4396}
4397
7ef224d1
TZ		 4398static int create_hitcount_val(struct hist_trigger_data *hist_data)
4399{
4400 hist_data->fields[HITCOUNT_IDX] =
30350d65 4401 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
7ef224d1
TZ		 4402 if (!hist_data->fields[HITCOUNT_IDX])
4403 return -ENOMEM;
4404
4405 hist_data->n_vals++;
30350d65 4406 hist_data->n_fields++;
7ef224d1
TZ		 4407
4408 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4409 return -EINVAL;
4410
4411 return 0;
4412}
4413
30350d65
TZ		 4414static int __create_val_field(struct hist_trigger_data *hist_data,
4415 unsigned int val_idx,
4416 struct trace_event_file *file,
4417 char *var_name, char *field_str,
4418 unsigned long flags)
f2606835 4419{
100719dc 4420 struct hist_field *hist_field;
f2606835
TZ		 4421 int ret = 0;
4422
100719dc
TZ		 4423 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
4424 if (IS_ERR(hist_field)) {
4425 ret = PTR_ERR(hist_field);
f2606835
TZ		 4426 goto out;
4427 }
4428
100719dc
TZ		 4429 hist_data->fields[val_idx] = hist_field;
4430
f2606835 4431 ++hist_data->n_vals;
30350d65 4432 ++hist_data->n_fields;
f2606835 4433
30350d65 4434 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
f2606835
TZ		 4435 ret = -EINVAL;
4436 out:
4437 return ret;
4438}
4439
30350d65
TZ		 4440static int create_val_field(struct hist_trigger_data *hist_data,
4441 unsigned int val_idx,
4442 struct trace_event_file *file,
4443 char *field_str)
4444{
4445 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4446 return -EINVAL;
4447
4448 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4449}
4450
4451static int create_var_field(struct hist_trigger_data *hist_data,
4452 unsigned int val_idx,
4453 struct trace_event_file *file,
4454 char *var_name, char *expr_str)
4455{
d0cd871b 4456 struct trace_array *tr = hist_data->event_file->tr;
30350d65
TZ		 4457 unsigned long flags = 0;
4458
4459 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4460 return -EINVAL;
f404da6e 4461
30350d65 4462 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
d0cd871b 4463 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
30350d65
TZ		 4464 return -EINVAL;
4465 }
4466
4467 flags |= HIST_FIELD_FL_VAR;
4468 hist_data->n_vars++;
4469 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4470 return -EINVAL;
4471
4472 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4473}
4474
7ef224d1
TZ		 4475static int create_val_fields(struct hist_trigger_data *hist_data,
4476 struct trace_event_file *file)
4477{
f2606835 4478 char *fields_str, *field_str;
30350d65 4479 unsigned int i, j = 1;
7ef224d1
TZ		 4480 int ret;
4481
4482 ret = create_hitcount_val(hist_data);
f2606835
TZ		 4483 if (ret)
4484 goto out;
7ef224d1 4485
f2606835
TZ		 4486 fields_str = hist_data->attrs->vals_str;
4487 if (!fields_str)
4488 goto out;
4489
4490 strsep(&fields_str, "=");
4491 if (!fields_str)
4492 goto out;
4493
4494 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4495 j < TRACING_MAP_VALS_MAX; i++) {
4496 field_str = strsep(&fields_str, ",");
4497 if (!field_str)
4498 break;
30350d65 4499
f2606835
TZ		 4500 if (strcmp(field_str, "hitcount") == 0)
4501 continue;
30350d65 4502
f2606835
TZ		 4503 ret = create_val_field(hist_data, j++, file, field_str);
4504 if (ret)
4505 goto out;
4506 }
30350d65 4507
f2606835
TZ		 4508 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4509 ret = -EINVAL;
4510 out:
7ef224d1
TZ		 4511 return ret;
4512}
4513
4514static int create_key_field(struct hist_trigger_data *hist_data,
4515 unsigned int key_idx,
76a3b0c8 4516 unsigned int key_offset,
7ef224d1
TZ		 4517 struct trace_event_file *file,
4518 char *field_str)
4519{
d0cd871b 4520 struct trace_array *tr = hist_data->event_file->tr;
30350d65 4521 struct hist_field *hist_field = NULL;
7ef224d1
TZ		 4522 unsigned long flags = 0;
4523 unsigned int key_size;
4524 int ret = 0;
4525
30350d65 4526 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
7ef224d1
TZ		 4527 return -EINVAL;
4528
4529 flags |= HIST_FIELD_FL_KEY;
4530
69a0200c
TZ		 4531 if (strcmp(field_str, "stacktrace") == 0) {
4532 flags |= HIST_FIELD_FL_STACKTRACE;
4533 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
30350d65 4534 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
69a0200c 4535 } else {
100719dc
TZ		 4536 hist_field = parse_expr(hist_data, file, field_str, flags,
4537 NULL, 0);
4538 if (IS_ERR(hist_field)) {
4539 ret = PTR_ERR(hist_field);
4540 goto out;
69a0200c
TZ		 4541 }
4542
c8d94a18 4543 if (field_has_hist_vars(hist_field, 0)) {
d0cd871b 4544 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
067fe038
TZ		 4545 destroy_hist_field(hist_field, 0);
4546 ret = -EINVAL;
4547 goto out;
4548 }
4549
100719dc 4550 key_size = hist_field->size;
7ef224d1
TZ		 4551 }
4552
100719dc 4553 hist_data->fields[key_idx] = hist_field;
7ef224d1
TZ		 4554
4555 key_size = ALIGN(key_size, sizeof(u64));
4556 hist_data->fields[key_idx]->size = key_size;
76a3b0c8 4557 hist_data->fields[key_idx]->offset = key_offset;
100719dc 4558
76a3b0c8 4559 hist_data->key_size += key_size;
100719dc 4560
7ef224d1
TZ		 4561 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4562 ret = -EINVAL;
4563 goto out;
4564 }
4565
4566 hist_data->n_keys++;
30350d65 4567 hist_data->n_fields++;
7ef224d1
TZ		 4568
4569 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4570 return -EINVAL;
4571
4572 ret = key_size;
4573 out:
4574 return ret;
4575}
4576
4577static int create_key_fields(struct hist_trigger_data *hist_data,
4578 struct trace_event_file *file)
4579{
76a3b0c8 4580 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
7ef224d1
TZ		 4581 char *fields_str, *field_str;
4582 int ret = -EINVAL;
4583
4584 fields_str = hist_data->attrs->keys_str;
4585 if (!fields_str)
4586 goto out;
4587
4588 strsep(&fields_str, "=");
4589 if (!fields_str)
4590 goto out;
4591
76a3b0c8 4592 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
7ef224d1
TZ		 4593 field_str = strsep(&fields_str, ",");
4594 if (!field_str)
4595 break;
76a3b0c8
TZ		 4596 ret = create_key_field(hist_data, i, key_offset,
4597 file, field_str);
7ef224d1
TZ		 4598 if (ret < 0)
4599 goto out;
76a3b0c8 4600 key_offset += ret;
7ef224d1
TZ		 4601 }
4602 if (fields_str) {
4603 ret = -EINVAL;
4604 goto out;
4605 }
4606 ret = 0;
4607 out:
4608 return ret;
4609}
4610
30350d65
TZ		 4611static int create_var_fields(struct hist_trigger_data *hist_data,
4612 struct trace_event_file *file)
4613{
4614 unsigned int i, j = hist_data->n_vals;
4615 int ret = 0;
4616
4617 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4618
4619 for (i = 0; i < n_vars; i++) {
4620 char *var_name = hist_data->attrs->var_defs.name[i];
4621 char *expr = hist_data->attrs->var_defs.expr[i];
4622
4623 ret = create_var_field(hist_data, j++, file, var_name, expr);
4624 if (ret)
4625 goto out;
4626 }
4627 out:
4628 return ret;
4629}
4630
4631static void free_var_defs(struct hist_trigger_data *hist_data)
4632{
4633 unsigned int i;
4634
4635 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4636 kfree(hist_data->attrs->var_defs.name[i]);
4637 kfree(hist_data->attrs->var_defs.expr[i]);
4638 }
4639
4640 hist_data->attrs->var_defs.n_vars = 0;
4641}
4642
4643static int parse_var_defs(struct hist_trigger_data *hist_data)
4644{
d0cd871b 4645 struct trace_array *tr = hist_data->event_file->tr;
30350d65
TZ		 4646 char *s, *str, *var_name, *field_str;
4647 unsigned int i, j, n_vars = 0;
4648 int ret = 0;
4649
4650 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4651 str = hist_data->attrs->assignment_str[i];
4652 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4653 field_str = strsep(&str, ",");
4654 if (!field_str)
4655 break;
4656
4657 var_name = strsep(&field_str, "=");
4658 if (!var_name || !field_str) {
d0cd871b
SRV		 4659 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4660 errpos(var_name));
30350d65
TZ		 4661 ret = -EINVAL;
4662 goto free;
4663 }
4664
4665 if (n_vars == TRACING_MAP_VARS_MAX) {
d0cd871b 4666 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
30350d65
TZ		 4667 ret = -EINVAL;
4668 goto free;
4669 }
4670
4671 s = kstrdup(var_name, GFP_KERNEL);
4672 if (!s) {
4673 ret = -ENOMEM;
4674 goto free;
4675 }
4676 hist_data->attrs->var_defs.name[n_vars] = s;
4677
4678 s = kstrdup(field_str, GFP_KERNEL);
4679 if (!s) {
4680 kfree(hist_data->attrs->var_defs.name[n_vars]);
4681 ret = -ENOMEM;
4682 goto free;
4683 }
4684 hist_data->attrs->var_defs.expr[n_vars++] = s;
4685
4686 hist_data->attrs->var_defs.n_vars = n_vars;
4687 }
4688 }
4689
4690 return ret;
4691 free:
4692 free_var_defs(hist_data);
4693
4694 return ret;
4695}
4696
7ef224d1
TZ		 4697static int create_hist_fields(struct hist_trigger_data *hist_data,
4698 struct trace_event_file *file)
4699{
4700 int ret;
4701
30350d65
TZ		 4702 ret = parse_var_defs(hist_data);
4703 if (ret)
4704 goto out;
4705
7ef224d1
TZ		 4706 ret = create_val_fields(hist_data, file);
4707 if (ret)
4708 goto out;
4709
30350d65 4710 ret = create_var_fields(hist_data, file);
7ef224d1
TZ		 4711 if (ret)
4712 goto out;
4713
30350d65
TZ		 4714 ret = create_key_fields(hist_data, file);
4715 if (ret)
4716 goto out;
7ef224d1 4717 out:
30350d65
TZ		 4718 free_var_defs(hist_data);
4719
7ef224d1
TZ		 4720 return ret;
4721}
4722
e62347d2
TZ		 4723static int is_descending(const char *str)
4724{
4725 if (!str)
4726 return 0;
4727
4728 if (strcmp(str, "descending") == 0)
4729 return 1;
4730
4731 if (strcmp(str, "ascending") == 0)
4732 return 0;
4733
4734 return -EINVAL;
4735}
4736
7ef224d1
TZ		 4737static int create_sort_keys(struct hist_trigger_data *hist_data)
4738{
e62347d2 4739 char *fields_str = hist_data->attrs->sort_key_str;
e62347d2
TZ		 4740 struct tracing_map_sort_key *sort_key;
4741 int descending, ret = 0;
30350d65 4742 unsigned int i, j, k;
e62347d2
TZ		 4743
4744 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4745
4746 if (!fields_str)
4747 goto out;
4748
4749 strsep(&fields_str, "=");
4750 if (!fields_str) {
4751 ret = -EINVAL;
4752 goto out;
4753 }
4754
4755 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
85013256 4756 struct hist_field *hist_field;
e62347d2 4757 char *field_str, *field_name;
85013256 4758 const char *test_name;
e62347d2
TZ		 4759
4760 sort_key = &hist_data->sort_keys[i];
4761
4762 field_str = strsep(&fields_str, ",");
4763 if (!field_str) {
4764 if (i == 0)
4765 ret = -EINVAL;
4766 break;
4767 }
4768
4769 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4770 ret = -EINVAL;
4771 break;
4772 }
7ef224d1 4773
e62347d2
TZ		 4774 field_name = strsep(&field_str, ".");
4775 if (!field_name) {
4776 ret = -EINVAL;
4777 break;
4778 }
4779
4780 if (strcmp(field_name, "hitcount") == 0) {
4781 descending = is_descending(field_str);
4782 if (descending < 0) {
4783 ret = descending;
4784 break;
4785 }
4786 sort_key->descending = descending;
4787 continue;
4788 }
7ef224d1 4789
30350d65
TZ		 4790 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4791 unsigned int idx;
4792
85013256 4793 hist_field = hist_data->fields[j];
30350d65
TZ		 4794 if (hist_field->flags & HIST_FIELD_FL_VAR)
4795 continue;
4796
4797 idx = k++;
4798
85013256
TZ		 4799 test_name = hist_field_name(hist_field, 0);
4800
4801 if (strcmp(field_name, test_name) == 0) {
30350d65 4802 sort_key->field_idx = idx;
e62347d2
TZ		 4803 descending = is_descending(field_str);
4804 if (descending < 0) {
4805 ret = descending;
4806 goto out;
4807 }
4808 sort_key->descending = descending;
4809 break;
4810 }
4811 }
4812 if (j == hist_data->n_fields) {
4813 ret = -EINVAL;
4814 break;
4815 }
4816 }
30350d65 4817
e62347d2
TZ		 4818 hist_data->n_sort_keys = i;
4819 out:
7ef224d1
TZ		 4820 return ret;
4821}
4822
0212e2aa
TZ		 4823static void destroy_actions(struct hist_trigger_data *hist_data)
4824{
4825 unsigned int i;
4826
4827 for (i = 0; i < hist_data->n_actions; i++) {
4828 struct action_data *data = hist_data->actions[i];
4829
7d18a10c 4830 if (data->handler == HANDLER_ONMATCH)
c282a386 4831 onmatch_destroy(data);
dff81f55
TZ		 4832 else if (data->handler == HANDLER_ONMAX ||
4833 data->handler == HANDLER_ONCHANGE)
466f4528 4834 track_data_destroy(hist_data, data);
c282a386
TZ		 4835 else
4836 kfree(data);
0212e2aa
TZ		 4837 }
4838}
4839
4840static int parse_actions(struct hist_trigger_data *hist_data)
4841{
c282a386
TZ		 4842 struct trace_array *tr = hist_data->event_file->tr;
4843 struct action_data *data;
0212e2aa
TZ		 4844 unsigned int i;
4845 int ret = 0;
4846 char *str;
036876fa 4847 int len;
0212e2aa
TZ		 4848
4849 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4850 str = hist_data->attrs->action_str[i];
c282a386 4851
036876fa
SRV		 4852 if ((len = str_has_prefix(str, "onmatch("))) {
4853 char *action_str = str + len;
c282a386
TZ		 4854
4855 data = onmatch_parse(tr, action_str);
4856 if (IS_ERR(data)) {
4857 ret = PTR_ERR(data);
4858 break;
4859 }
036876fa
SRV		 4860 } else if ((len = str_has_prefix(str, "onmax("))) {
4861 char *action_str = str + len;
50450603 4862
466f4528
TZ		 4863 data = track_data_parse(hist_data, action_str,
4864 HANDLER_ONMAX);
50450603
TZ		 4865 if (IS_ERR(data)) {
4866 ret = PTR_ERR(data);
4867 break;
4868 }
dff81f55
TZ		 4869 } else if ((len = str_has_prefix(str, "onchange("))) {
4870 char *action_str = str + len;
4871
4872 data = track_data_parse(hist_data, action_str,
4873 HANDLER_ONCHANGE);
4874 if (IS_ERR(data)) {
4875 ret = PTR_ERR(data);
4876 break;
4877 }
c282a386
TZ		 4878 } else {
4879 ret = -EINVAL;
4880 break;
4881 }
4882
4883 hist_data->actions[hist_data->n_actions++] = data;
0212e2aa
TZ		 4884 }
4885
4886 return ret;
4887}
4888
7d18a10c 4889static int create_actions(struct hist_trigger_data *hist_data)
0212e2aa
TZ		 4890{
4891 struct action_data *data;
4892 unsigned int i;
4893 int ret = 0;
4894
4895 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4896 data = hist_data->actions[i];
c282a386 4897
7d18a10c
TZ		 4898 if (data->handler == HANDLER_ONMATCH) {
4899 ret = onmatch_create(hist_data, data);
c282a386 4900 if (ret)
7d18a10c 4901 break;
dff81f55
TZ		 4902 } else if (data->handler == HANDLER_ONMAX ||
4903 data->handler == HANDLER_ONCHANGE) {
466f4528 4904 ret = track_data_create(hist_data, data);
50450603 4905 if (ret)
7d18a10c
TZ		 4906 break;
4907 } else {
4908 ret = -EINVAL;
4909 break;
c282a386 4910 }
0212e2aa
TZ		 4911 }
4912
4913 return ret;
4914}
4915
50450603
TZ		 4916static void print_actions(struct seq_file *m,
4917 struct hist_trigger_data *hist_data,
4918 struct tracing_map_elt *elt)
4919{
4920 unsigned int i;
4921
4922 for (i = 0; i < hist_data->n_actions; i++) {
4923 struct action_data *data = hist_data->actions[i];
4924
a3785b7e
TZ		 4925 if (data->action == ACTION_SNAPSHOT)
4926 continue;
4927
dff81f55
TZ		 4928 if (data->handler == HANDLER_ONMAX ||
4929 data->handler == HANDLER_ONCHANGE)
466f4528 4930 track_data_print(m, hist_data, elt, data);
50450603
TZ		 4931 }
4932}
4933
7d18a10c
TZ		 4934static void print_action_spec(struct seq_file *m,
4935 struct hist_trigger_data *hist_data,
4936 struct action_data *data)
4937{
4938 unsigned int i;
4939
4940 if (data->action == ACTION_SAVE) {
4941 for (i = 0; i < hist_data->n_save_vars; i++) {
4942 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4943 if (i < hist_data->n_save_vars - 1)
4944 seq_puts(m, ",");
4945 }
4946 } else if (data->action == ACTION_TRACE) {
e91eefd7
TZ		 4947 if (data->use_trace_keyword)
4948 seq_printf(m, "%s", data->synth_event_name);
7d18a10c 4949 for (i = 0; i < data->n_params; i++) {
e91eefd7 4950 if (i || data->use_trace_keyword)
7d18a10c
TZ		 4951 seq_puts(m, ",");
4952 seq_printf(m, "%s", data->params[i]);
4953 }
4954 }
4955}
4956
466f4528
TZ		 4957static void print_track_data_spec(struct seq_file *m,
4958 struct hist_trigger_data *hist_data,
4959 struct action_data *data)
50450603 4960{
466f4528
TZ		 4961 if (data->handler == HANDLER_ONMAX)
4962 seq_puts(m, ":onmax(");
dff81f55
TZ		 4963 else if (data->handler == HANDLER_ONCHANGE)
4964 seq_puts(m, ":onchange(");
466f4528 4965 seq_printf(m, "%s", data->track_data.var_str);
7d18a10c
TZ		 4966 seq_printf(m, ").%s(", data->action_name);
4967
4968 print_action_spec(m, hist_data, data);
50450603 4969
50450603
TZ		 4970 seq_puts(m, ")");
4971}
4972
c282a386
TZ		 4973static void print_onmatch_spec(struct seq_file *m,
4974 struct hist_trigger_data *hist_data,
4975 struct action_data *data)
4976{
c3e49506
TZ		 4977 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4978 data->match_data.event);
c282a386 4979
7d18a10c 4980 seq_printf(m, "%s(", data->action_name);
c282a386 4981
7d18a10c 4982 print_action_spec(m, hist_data, data);
c282a386
TZ		 4983
4984 seq_puts(m, ")");
4985}
4986
48f79473
TZ		 4987static bool actions_match(struct hist_trigger_data *hist_data,
4988 struct hist_trigger_data *hist_data_test)
4989{
4990 unsigned int i, j;
4991
4992 if (hist_data->n_actions != hist_data_test->n_actions)
4993 return false;
4994
4995 for (i = 0; i < hist_data->n_actions; i++) {
4996 struct action_data *data = hist_data->actions[i];
4997 struct action_data *data_test = hist_data_test->actions[i];
e91eefd7 4998 char *action_name, *action_name_test;
48f79473 4999
7d18a10c
TZ		 5000 if (data->handler != data_test->handler)
5001 return false;
5002 if (data->action != data_test->action)
48f79473
TZ		 5003 return false;
5004
5005 if (data->n_params != data_test->n_params)
5006 return false;
5007
5008 for (j = 0; j < data->n_params; j++) {
5009 if (strcmp(data->params[j], data_test->params[j]) != 0)
5010 return false;
5011 }
5012
e91eefd7
TZ		 5013 if (data->use_trace_keyword)
5014 action_name = data->synth_event_name;
5015 else
5016 action_name = data->action_name;
5017
5018 if (data_test->use_trace_keyword)
5019 action_name_test = data_test->synth_event_name;
5020 else
5021 action_name_test = data_test->action_name;
5022
5023 if (strcmp(action_name, action_name_test) != 0)
7d18a10c
TZ		 5024 return false;
5025
5026 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 5027 if (strcmp(data->match_data.event_system,
5028 data_test->match_data.event_system) != 0)
48f79473 5029 return false;
c3e49506
TZ		 5030 if (strcmp(data->match_data.event,
5031 data_test->match_data.event) != 0)
48f79473 5032 return false;
dff81f55
TZ		 5033 } else if (data->handler == HANDLER_ONMAX ||
5034 data->handler == HANDLER_ONCHANGE) {
466f4528
TZ		 5035 if (strcmp(data->track_data.var_str,
5036 data_test->track_data.var_str) != 0)
48f79473 5037 return false;
48f79473
TZ		 5038 }
5039 }
5040
5041 return true;
5042}
5043
5044
c282a386
TZ		 5045static void print_actions_spec(struct seq_file *m,
5046 struct hist_trigger_data *hist_data)
5047{
5048 unsigned int i;
5049
5050 for (i = 0; i < hist_data->n_actions; i++) {
5051 struct action_data *data = hist_data->actions[i];
5052
7d18a10c 5053 if (data->handler == HANDLER_ONMATCH)
c282a386 5054 print_onmatch_spec(m, hist_data, data);
dff81f55
TZ		 5055 else if (data->handler == HANDLER_ONMAX ||
5056 data->handler == HANDLER_ONCHANGE)
466f4528 5057 print_track_data_spec(m, hist_data, data);
c282a386
TZ		 5058 }
5059}
5060
02205a67
TZ		 5061static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
5062{
5063 unsigned int i;
5064
5065 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5066 kfree(hist_data->field_var_hists[i]->cmd);
5067 kfree(hist_data->field_var_hists[i]);
5068 }
5069}
5070
7ef224d1
TZ		 5071static void destroy_hist_data(struct hist_trigger_data *hist_data)
5072{
0212e2aa
TZ		 5073 if (!hist_data)
5074 return;
5075
7ef224d1
TZ		 5076 destroy_hist_trigger_attrs(hist_data->attrs);
5077 destroy_hist_fields(hist_data);
5078 tracing_map_destroy(hist_data->map);
0212e2aa
TZ		 5079
5080 destroy_actions(hist_data);
02205a67
TZ		 5081 destroy_field_vars(hist_data);
5082 destroy_field_var_hists(hist_data);
0212e2aa 5083
7ef224d1
TZ		 5084 kfree(hist_data);
5085}
5086
5087static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
5088{
5089 struct tracing_map *map = hist_data->map;
5090 struct ftrace_event_field *field;
5091 struct hist_field *hist_field;
b28d7b2d 5092 int i, idx = 0;
7ef224d1
TZ		 5093
5094 for_each_hist_field(i, hist_data) {
5095 hist_field = hist_data->fields[i];
5096 if (hist_field->flags & HIST_FIELD_FL_KEY) {
5097 tracing_map_cmp_fn_t cmp_fn;
5098
5099 field = hist_field->field;
5100
69a0200c
TZ		 5101 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
5102 cmp_fn = tracing_map_cmp_none;
ad42febe
TZ		 5103 else if (!field)
5104 cmp_fn = tracing_map_cmp_num(hist_field->size,
5105 hist_field->is_signed);
69a0200c 5106 else if (is_string_field(field))
7ef224d1
TZ		 5107 cmp_fn = tracing_map_cmp_string;
5108 else
5109 cmp_fn = tracing_map_cmp_num(field->size,
5110 field->is_signed);
76a3b0c8
TZ		 5111 idx = tracing_map_add_key_field(map,
5112 hist_field->offset,
5113 cmp_fn);
30350d65 5114 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
7ef224d1
TZ		 5115 idx = tracing_map_add_sum_field(map);
5116
5117 if (idx < 0)
5118 return idx;
30350d65
TZ		 5119
5120 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5121 idx = tracing_map_add_var(map);
5122 if (idx < 0)
5123 return idx;
5124 hist_field->var.idx = idx;
5125 hist_field->var.hist_data = hist_data;
5126 }
7ef224d1
TZ		 5127 }
5128
5129 return 0;
5130}
5131
5132static struct hist_trigger_data *
5133create_hist_data(unsigned int map_bits,
5134 struct hist_trigger_attrs *attrs,
30350d65
TZ		 5135 struct trace_event_file *file,
5136 bool remove)
7ef224d1 5137{
6b4827ad 5138 const struct tracing_map_ops *map_ops = NULL;
7ef224d1
TZ		 5139 struct hist_trigger_data *hist_data;
5140 int ret = 0;
5141
5142 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5143 if (!hist_data)
5144 return ERR_PTR(-ENOMEM);
5145
5146 hist_data->attrs = attrs;
30350d65 5147 hist_data->remove = remove;
067fe038 5148 hist_data->event_file = file;
7ef224d1 5149
0212e2aa
TZ		 5150 ret = parse_actions(hist_data);
5151 if (ret)
5152 goto free;
5153
7ef224d1
TZ		 5154 ret = create_hist_fields(hist_data, file);
5155 if (ret)
5156 goto free;
5157
5158 ret = create_sort_keys(hist_data);
5159 if (ret)
5160 goto free;
5161
af6a29bc 5162 map_ops = &hist_trigger_elt_data_ops;
6b4827ad 5163
7ef224d1 5164 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
6b4827ad 5165 map_ops, hist_data);
7ef224d1
TZ		 5166 if (IS_ERR(hist_data->map)) {
5167 ret = PTR_ERR(hist_data->map);
5168 hist_data->map = NULL;
5169 goto free;
5170 }
5171
5172 ret = create_tracing_map_fields(hist_data);
5173 if (ret)
5174 goto free;
7ef224d1
TZ		 5175 out:
5176 return hist_data;
5177 free:
5178 hist_data->attrs = NULL;
5179
5180 destroy_hist_data(hist_data);
5181
5182 hist_data = ERR_PTR(ret);
5183
5184 goto out;
5185}
5186
5187static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
fbd302cb 5188 struct tracing_map_elt *elt, void *rec,
067fe038
TZ		 5189 struct ring_buffer_event *rbe,
5190 u64 *var_ref_vals)
7ef224d1 5191{
067fe038 5192 struct hist_elt_data *elt_data;
7ef224d1 5193 struct hist_field *hist_field;
30350d65 5194 unsigned int i, var_idx;
7ef224d1
TZ		 5195 u64 hist_val;
5196
067fe038
TZ		 5197 elt_data = elt->private_data;
5198 elt_data->var_ref_vals = var_ref_vals;
5199
7ef224d1
TZ		 5200 for_each_hist_val_field(i, hist_data) {
5201 hist_field = hist_data->fields[i];
df35d93b 5202 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5203 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5204 var_idx = hist_field->var.idx;
5205 tracing_map_set_var(elt, var_idx, hist_val);
5206 continue;
5207 }
7ef224d1
TZ		 5208 tracing_map_update_sum(elt, i, hist_val);
5209 }
30350d65
TZ		 5210
5211 for_each_hist_key_field(i, hist_data) {
5212 hist_field = hist_data->fields[i];
5213 if (hist_field->flags & HIST_FIELD_FL_VAR) {
df35d93b 5214 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
30350d65
TZ		 5215 var_idx = hist_field->var.idx;
5216 tracing_map_set_var(elt, var_idx, hist_val);
5217 }
5218 }
02205a67
TZ		 5219
5220 update_field_vars(hist_data, elt, rbe, rec);
7ef224d1
TZ		 5221}
5222
6a475cb1
TZ		 5223static inline void add_to_key(char *compound_key, void *key,
5224 struct hist_field *key_field, void *rec)
5225{
5226 size_t size = key_field->size;
5227
5228 if (key_field->flags & HIST_FIELD_FL_STRING) {
5229 struct ftrace_event_field *field;
5230
5231 field = key_field->field;
5232 if (field->filter_type == FILTER_DYN_STRING)
5233 size = *(u32 *)(rec + field->offset) >> 16;
5234 else if (field->filter_type == FILTER_PTR_STRING)
5235 size = strlen(key);
5236 else if (field->filter_type == FILTER_STATIC_STRING)
5237 size = field->size;
5238
5239 /* ensure NULL-termination */
5240 if (size > key_field->size - 1)
5241 size = key_field->size - 1;
6a475cb1 5242
9f0bbf31
TZ		 5243 strncpy(compound_key + key_field->offset, (char *)key, size);
5244 } else
5245 memcpy(compound_key + key_field->offset, key, size);
6a475cb1
TZ		 5246}
5247
0212e2aa
TZ		 5248static void
5249hist_trigger_actions(struct hist_trigger_data *hist_data,
5250 struct tracing_map_elt *elt, void *rec,
7d18a10c
TZ		 5251 struct ring_buffer_event *rbe, void *key,
5252 u64 *var_ref_vals)
0212e2aa
TZ		 5253{
5254 struct action_data *data;
5255 unsigned int i;
5256
5257 for (i = 0; i < hist_data->n_actions; i++) {
5258 data = hist_data->actions[i];
7d18a10c 5259 data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
0212e2aa
TZ		 5260 }
5261}
5262
1ac4f51c 5263static void event_hist_trigger(struct event_trigger_data *data, void *rec,
fbd302cb 5264 struct ring_buffer_event *rbe)
7ef224d1
TZ		 5265{
5266 struct hist_trigger_data *hist_data = data->private_data;
6a475cb1 5267 bool use_compound_key = (hist_data->n_keys > 1);
69a0200c 5268 unsigned long entries[HIST_STACKTRACE_DEPTH];
067fe038 5269 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
76a3b0c8 5270 char compound_key[HIST_KEY_SIZE_MAX];
df35d93b 5271 struct tracing_map_elt *elt = NULL;
7ef224d1 5272 struct hist_field *key_field;
7ef224d1
TZ		 5273 u64 field_contents;
5274 void *key = NULL;
5275 unsigned int i;
5276
6a475cb1 5277 memset(compound_key, 0, hist_data->key_size);
76a3b0c8 5278
7ef224d1
TZ		 5279 for_each_hist_key_field(i, hist_data) {
5280 key_field = hist_data->fields[i];
5281
69a0200c 5282 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
e7d91663
TG		 5283 memset(entries, 0, HIST_STACKTRACE_SIZE);
5284 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
5285 HIST_STACKTRACE_SKIP);
69a0200c
TZ		 5286 key = entries;
5287 } else {
df35d93b 5288 field_contents = key_field->fn(key_field, elt, rbe, rec);
6a475cb1 5289 if (key_field->flags & HIST_FIELD_FL_STRING) {
69a0200c 5290 key = (void *)(unsigned long)field_contents;
6a475cb1
TZ		 5291 use_compound_key = true;
5292 } else
69a0200c 5293 key = (void *)&field_contents;
76a3b0c8 5294 }
6a475cb1
TZ		 5295
5296 if (use_compound_key)
5297 add_to_key(compound_key, key, key_field, rec);
7ef224d1
TZ		 5298 }
5299
6a475cb1 5300 if (use_compound_key)
76a3b0c8
TZ		 5301 key = compound_key;
5302
067fe038
TZ		 5303 if (hist_data->n_var_refs &&
5304 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5305 return;
5306
7ef224d1 5307 elt = tracing_map_insert(hist_data->map, key);
067fe038
TZ		 5308 if (!elt)
5309 return;
5310
5311 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
0212e2aa
TZ		 5312
5313 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
7d18a10c 5314 hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
7ef224d1
TZ		 5315}
5316
69a0200c
TZ		 5317static void hist_trigger_stacktrace_print(struct seq_file *m,
5318 unsigned long *stacktrace_entries,
5319 unsigned int max_entries)
5320{
5321 char str[KSYM_SYMBOL_LEN];
5322 unsigned int spaces = 8;
5323 unsigned int i;
5324
5325 for (i = 0; i < max_entries; i++) {
4285f2fc 5326 if (!stacktrace_entries[i])
69a0200c
TZ		 5327 return;
5328
5329 seq_printf(m, "%*c", 1 + spaces, ' ');
5330 sprint_symbol(str, stacktrace_entries[i]);
5331 seq_printf(m, "%s\n", str);
5332 }
5333}
5334
a3785b7e
TZ		 5335static void hist_trigger_print_key(struct seq_file *m,
5336 struct hist_trigger_data *hist_data,
5337 void *key,
5338 struct tracing_map_elt *elt)
7ef224d1
TZ		 5339{
5340 struct hist_field *key_field;
c6afad49 5341 char str[KSYM_SYMBOL_LEN];
69a0200c 5342 bool multiline = false;
85013256 5343 const char *field_name;
7ef224d1
TZ		 5344 unsigned int i;
5345 u64 uval;
5346
5347 seq_puts(m, "{ ");
5348
5349 for_each_hist_key_field(i, hist_data) {
5350 key_field = hist_data->fields[i];
5351
5352 if (i > hist_data->n_vals)
5353 seq_puts(m, ", ");
5354
85013256
TZ		 5355 field_name = hist_field_name(key_field, 0);
5356
0c4a6b46
TZ		 5357 if (key_field->flags & HIST_FIELD_FL_HEX) {
5358 uval = *(u64 *)(key + key_field->offset);
85013256 5359 seq_printf(m, "%s: %llx", field_name, uval);
c6afad49
TZ		 5360 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5361 uval = *(u64 *)(key + key_field->offset);
5362 sprint_symbol_no_offset(str, uval);
85013256
TZ		 5363 seq_printf(m, "%s: [%llx] %-45s", field_name,
5364 uval, str);
c6afad49
TZ		 5365 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5366 uval = *(u64 *)(key + key_field->offset);
5367 sprint_symbol(str, uval);
85013256
TZ		 5368 seq_printf(m, "%s: [%llx] %-55s", field_name,
5369 uval, str);
6b4827ad 5370 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 5371 struct hist_elt_data *elt_data = elt->private_data;
5372 char *comm;
5373
5374 if (WARN_ON_ONCE(!elt_data))
5375 return;
5376
5377 comm = elt_data->comm;
6b4827ad
TZ		 5378
5379 uval = *(u64 *)(key + key_field->offset);
85013256
TZ		 5380 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5381 comm, uval);
31696198
TZ		 5382 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5383 const char *syscall_name;
5384
5385 uval = *(u64 *)(key + key_field->offset);
5386 syscall_name = get_syscall_name(uval);
5387 if (!syscall_name)
5388 syscall_name = "unknown_syscall";
5389
85013256
TZ		 5390 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5391 syscall_name, uval);
69a0200c
TZ		 5392 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5393 seq_puts(m, "stacktrace:\n");
5394 hist_trigger_stacktrace_print(m,
5395 key + key_field->offset,
5396 HIST_STACKTRACE_DEPTH);
5397 multiline = true;
4b94f5b7 5398 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
85013256 5399 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4b94f5b7 5400 *(u64 *)(key + key_field->offset));
0c4a6b46 5401 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
85013256 5402 seq_printf(m, "%s: %-50s", field_name,
76a3b0c8 5403 (char *)(key + key_field->offset));
7ef224d1 5404 } else {
76a3b0c8 5405 uval = *(u64 *)(key + key_field->offset);
85013256 5406 seq_printf(m, "%s: %10llu", field_name, uval);
7ef224d1
TZ		 5407 }
5408 }
5409
69a0200c
TZ		 5410 if (!multiline)
5411 seq_puts(m, " ");
5412
5413 seq_puts(m, "}");
a3785b7e
TZ		 5414}
5415
5416static void hist_trigger_entry_print(struct seq_file *m,
5417 struct hist_trigger_data *hist_data,
5418 void *key,
5419 struct tracing_map_elt *elt)
5420{
5421 const char *field_name;
5422 unsigned int i;
5423
5424 hist_trigger_print_key(m, hist_data, key, elt);
7ef224d1
TZ		 5425
5426 seq_printf(m, " hitcount: %10llu",
5427 tracing_map_read_sum(elt, HITCOUNT_IDX));
5428
f2606835 5429 for (i = 1; i < hist_data->n_vals; i++) {
85013256
TZ		 5430 field_name = hist_field_name(hist_data->fields[i], 0);
5431
100719dc
TZ		 5432 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
5433 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
30350d65
TZ		 5434 continue;
5435
0c4a6b46 5436 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
85013256 5437 seq_printf(m, " %s: %10llx", field_name,
0c4a6b46
TZ		 5438 tracing_map_read_sum(elt, i));
5439 } else {
85013256 5440 seq_printf(m, " %s: %10llu", field_name,
0c4a6b46
TZ		 5441 tracing_map_read_sum(elt, i));
5442 }
f2606835
TZ		 5443 }
5444
50450603
TZ		 5445 print_actions(m, hist_data, elt);
5446
7ef224d1
TZ		 5447 seq_puts(m, "\n");
5448}
5449
5450static int print_entries(struct seq_file *m,
5451 struct hist_trigger_data *hist_data)
5452{
5453 struct tracing_map_sort_entry **sort_entries = NULL;
5454 struct tracing_map *map = hist_data->map;
d50c744e 5455 int i, n_entries;
7ef224d1
TZ		 5456
5457 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5458 hist_data->n_sort_keys,
5459 &sort_entries);
5460 if (n_entries < 0)
5461 return n_entries;
5462
5463 for (i = 0; i < n_entries; i++)
5464 hist_trigger_entry_print(m, hist_data,
5465 sort_entries[i]->key,
5466 sort_entries[i]->elt);
5467
5468 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5469
5470 return n_entries;
5471}
5472
52a7f16d
TZ		 5473static void hist_trigger_show(struct seq_file *m,
5474 struct event_trigger_data *data, int n)
7ef224d1 5475{
7ef224d1 5476 struct hist_trigger_data *hist_data;
6e7a2398 5477 int n_entries;
7ef224d1 5478
52a7f16d
TZ		 5479 if (n > 0)
5480 seq_puts(m, "\n\n");
7ef224d1
TZ		 5481
5482 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5483 data->ops->print(m, data->ops, data);
52a7f16d 5484 seq_puts(m, "#\n\n");
7ef224d1
TZ		 5485
5486 hist_data = data->private_data;
5487 n_entries = print_entries(m, hist_data);
6e7a2398 5488 if (n_entries < 0)
7ef224d1 5489 n_entries = 0;
7ef224d1 5490
a3785b7e
TZ		 5491 track_data_snapshot_print(m, hist_data);
5492
7ef224d1
TZ		 5493 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5494 (u64)atomic64_read(&hist_data->map->hits),
5495 n_entries, (u64)atomic64_read(&hist_data->map->drops));
52a7f16d
TZ		 5496}
5497
5498static int hist_show(struct seq_file *m, void *v)
5499{
5500 struct event_trigger_data *data;
5501 struct trace_event_file *event_file;
5502 int n = 0, ret = 0;
5503
5504 mutex_lock(&event_mutex);
5505
5506 event_file = event_file_data(m->private);
5507 if (unlikely(!event_file)) {
5508 ret = -ENODEV;
5509 goto out_unlock;
5510 }
5511
5512 list_for_each_entry_rcu(data, &event_file->triggers, list) {
5513 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5514 hist_trigger_show(m, data, n++);
5515 }
5516
7ef224d1
TZ		 5517 out_unlock:
5518 mutex_unlock(&event_mutex);
5519
5520 return ret;
5521}
5522
5523static int event_hist_open(struct inode *inode, struct file *file)
5524{
17911ff3
SRV		 5525 int ret;
5526
5527 ret = security_locked_down(LOCKDOWN_TRACEFS);
5528 if (ret)
5529 return ret;
5530
7ef224d1
TZ		 5531 return single_open(file, hist_show, file);
5532}
5533
5534const struct file_operations event_hist_fops = {
5535 .open = event_hist_open,
5536 .read = seq_read,
5537 .llseek = seq_lseek,
5538 .release = single_release,
5539};
5540
5541static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5542{
85013256
TZ		 5543 const char *field_name = hist_field_name(hist_field, 0);
5544
30350d65
TZ		 5545 if (hist_field->var.name)
5546 seq_printf(m, "%s=", hist_field->var.name);
5547
0ae7961e 5548 if (hist_field->flags & HIST_FIELD_FL_CPU)
8b7622bf 5549 seq_puts(m, "cpu");
067fe038 5550 else if (field_name) {
7e8b88a3
TZ		 5551 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5552 hist_field->flags & HIST_FIELD_FL_ALIAS)
067fe038 5553 seq_putc(m, '$');
ad42febe 5554 seq_printf(m, "%s", field_name);
0ae7961e
TZ		 5555 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5556 seq_puts(m, "common_timestamp");
608940da
TZ		 5557
5558 if (hist_field->flags) {
5559 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5560 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5561 const char *flags = get_hist_field_flags(hist_field);
5562
5563 if (flags)
5564 seq_printf(m, ".%s", flags);
5565 }
5566 }
7ef224d1
TZ		 5567}
5568
5569static int event_hist_trigger_print(struct seq_file *m,
5570 struct event_trigger_ops *ops,
5571 struct event_trigger_data *data)
5572{
5573 struct hist_trigger_data *hist_data = data->private_data;
30350d65
TZ		 5574 struct hist_field *field;
5575 bool have_var = false;
7ef224d1
TZ		 5576 unsigned int i;
5577
5463bfda
TZ		 5578 seq_puts(m, "hist:");
5579
5580 if (data->name)
5581 seq_printf(m, "%s:", data->name);
5582
5583 seq_puts(m, "keys=");
7ef224d1
TZ		 5584
5585 for_each_hist_key_field(i, hist_data) {
30350d65 5586 field = hist_data->fields[i];
7ef224d1
TZ		 5587
5588 if (i > hist_data->n_vals)
5589 seq_puts(m, ",");
5590
30350d65 5591 if (field->flags & HIST_FIELD_FL_STACKTRACE)
69a0200c
TZ		 5592 seq_puts(m, "stacktrace");
5593 else
30350d65 5594 hist_field_print(m, field);
7ef224d1
TZ		 5595 }
5596
5597 seq_puts(m, ":vals=");
f2606835
TZ		 5598
5599 for_each_hist_val_field(i, hist_data) {
30350d65
TZ		 5600 field = hist_data->fields[i];
5601 if (field->flags & HIST_FIELD_FL_VAR) {
5602 have_var = true;
5603 continue;
5604 }
5605
f2606835
TZ		 5606 if (i == HITCOUNT_IDX)
5607 seq_puts(m, "hitcount");
5608 else {
5609 seq_puts(m, ",");
30350d65
TZ		 5610 hist_field_print(m, field);
5611 }
5612 }
5613
5614 if (have_var) {
5615 unsigned int n = 0;
5616
5617 seq_puts(m, ":");
5618
5619 for_each_hist_val_field(i, hist_data) {
5620 field = hist_data->fields[i];
5621
5622 if (field->flags & HIST_FIELD_FL_VAR) {
5623 if (n++)
5624 seq_puts(m, ",");
5625 hist_field_print(m, field);
5626 }
f2606835
TZ		 5627 }
5628 }
7ef224d1
TZ		 5629
5630 seq_puts(m, ":sort=");
e62347d2
TZ		 5631
5632 for (i = 0; i < hist_data->n_sort_keys; i++) {
5633 struct tracing_map_sort_key *sort_key;
30350d65
TZ		 5634 unsigned int idx, first_key_idx;
5635
5636 /* skip VAR vals */
5637 first_key_idx = hist_data->n_vals - hist_data->n_vars;
e62347d2
TZ		 5638
5639 sort_key = &hist_data->sort_keys[i];
ad42febe
TZ		 5640 idx = sort_key->field_idx;
5641
1a361dfc 5642 if (WARN_ON(idx >= HIST_FIELDS_MAX))
ad42febe 5643 return -EINVAL;
e62347d2
TZ		 5644
5645 if (i > 0)
5646 seq_puts(m, ",");
5647
ad42febe 5648 if (idx == HITCOUNT_IDX)
e62347d2 5649 seq_puts(m, "hitcount");
30350d65
TZ		 5650 else {
5651 if (idx >= first_key_idx)
5652 idx += hist_data->n_vars;
e62347d2 5653 hist_field_print(m, hist_data->fields[idx]);
30350d65 5654 }
e62347d2
TZ		 5655
5656 if (sort_key->descending)
5657 seq_puts(m, ".descending");
5658 }
7ef224d1 5659 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
a4072fe8
TZ		 5660 if (hist_data->enable_timestamps)
5661 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
7ef224d1 5662
c282a386
TZ		 5663 print_actions_spec(m, hist_data);
5664
7ef224d1
TZ		 5665 if (data->filter_str)
5666 seq_printf(m, " if %s", data->filter_str);
5667
83e99914
TZ		 5668 if (data->paused)
5669 seq_puts(m, " [paused]");
5670 else
5671 seq_puts(m, " [active]");
7ef224d1
TZ		 5672
5673 seq_putc(m, '\n');
5674
5675 return 0;
5676}
5677
5463bfda
TZ		 5678static int event_hist_trigger_init(struct event_trigger_ops *ops,
5679 struct event_trigger_data *data)
5680{
5681 struct hist_trigger_data *hist_data = data->private_data;
5682
5683 if (!data->ref && hist_data->attrs->name)
5684 save_named_trigger(hist_data->attrs->name, data);
5685
5686 data->ref++;
5687
5688 return 0;
5689}
5690
02205a67
TZ		 5691static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5692{
5693 struct trace_event_file *file;
5694 unsigned int i;
5695 char *cmd;
5696 int ret;
5697
5698 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5699 file = hist_data->field_var_hists[i]->hist_data->event_file;
5700 cmd = hist_data->field_var_hists[i]->cmd;
5701 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5702 "!hist", "hist", cmd);
5703 }
5704}
5705
7ef224d1
TZ		 5706static void event_hist_trigger_free(struct event_trigger_ops *ops,
5707 struct event_trigger_data *data)
5708{
5709 struct hist_trigger_data *hist_data = data->private_data;
5710
5711 if (WARN_ON_ONCE(data->ref <= 0))
5712 return;
5713
5714 data->ref--;
5715 if (!data->ref) {
5463bfda
TZ		 5716 if (data->name)
5717 del_named_trigger(data);
067fe038 5718
7ef224d1 5719 trigger_data_free(data);
067fe038
TZ		 5720
5721 remove_hist_vars(hist_data);
5722
02205a67
TZ		 5723 unregister_field_var_hists(hist_data);
5724
7ef224d1
TZ		 5725 destroy_hist_data(hist_data);
5726 }
5727}
5728
5729static struct event_trigger_ops event_hist_trigger_ops = {
5730 .func = event_hist_trigger,
5731 .print = event_hist_trigger_print,
5463bfda 5732 .init = event_hist_trigger_init,
7ef224d1
TZ		 5733 .free = event_hist_trigger_free,
5734};
5735
5463bfda
TZ		 5736static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5737 struct event_trigger_data *data)
5738{
5739 data->ref++;
5740
5741 save_named_trigger(data->named_data->name, data);
5742
5743 event_hist_trigger_init(ops, data->named_data);
5744
5745 return 0;
5746}
5747
5748static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5749 struct event_trigger_data *data)
5750{
5751 if (WARN_ON_ONCE(data->ref <= 0))
5752 return;
5753
5754 event_hist_trigger_free(ops, data->named_data);
5755
5756 data->ref--;
5757 if (!data->ref) {
5758 del_named_trigger(data);
5759 trigger_data_free(data);
5760 }
5761}
5762
5763static struct event_trigger_ops event_hist_trigger_named_ops = {
5764 .func = event_hist_trigger,
5765 .print = event_hist_trigger_print,
5766 .init = event_hist_trigger_named_init,
5767 .free = event_hist_trigger_named_free,
5768};
5769
7ef224d1
TZ		 5770static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5771 char *param)
5772{
5773 return &event_hist_trigger_ops;
5774}
5775
e86ae9ba
TZ		 5776static void hist_clear(struct event_trigger_data *data)
5777{
5778 struct hist_trigger_data *hist_data = data->private_data;
e86ae9ba 5779
5463bfda
TZ		 5780 if (data->name)
5781 pause_named_trigger(data);
e86ae9ba 5782
e0a568dc 5783 tracepoint_synchronize_unregister();
e86ae9ba
TZ		 5784
5785 tracing_map_clear(hist_data->map);
5786
5463bfda
TZ		 5787 if (data->name)
5788 unpause_named_trigger(data);
5789}
5790
5791static bool compatible_field(struct ftrace_event_field *field,
5792 struct ftrace_event_field *test_field)
5793{
5794 if (field == test_field)
5795 return true;
5796 if (field == NULL || test_field == NULL)
5797 return false;
5798 if (strcmp(field->name, test_field->name) != 0)
5799 return false;
5800 if (strcmp(field->type, test_field->type) != 0)
5801 return false;
5802 if (field->size != test_field->size)
5803 return false;
5804 if (field->is_signed != test_field->is_signed)
5805 return false;
5806
5807 return true;
e86ae9ba
TZ		 5808}
5809
52a7f16d 5810static bool hist_trigger_match(struct event_trigger_data *data,
5463bfda
TZ		 5811 struct event_trigger_data *data_test,
5812 struct event_trigger_data *named_data,
5813 bool ignore_filter)
52a7f16d
TZ		 5814{
5815 struct tracing_map_sort_key *sort_key, *sort_key_test;
5816 struct hist_trigger_data *hist_data, *hist_data_test;
5817 struct hist_field *key_field, *key_field_test;
5818 unsigned int i;
5819
5463bfda
TZ		 5820 if (named_data && (named_data != data_test) &&
5821 (named_data != data_test->named_data))
5822 return false;
5823
5824 if (!named_data && is_named_trigger(data_test))
5825 return false;
5826
52a7f16d
TZ		 5827 hist_data = data->private_data;
5828 hist_data_test = data_test->private_data;
5829
5830 if (hist_data->n_vals != hist_data_test->n_vals ||
5831 hist_data->n_fields != hist_data_test->n_fields ||
5832 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5833 return false;
5834
5463bfda
TZ		 5835 if (!ignore_filter) {
5836 if ((data->filter_str && !data_test->filter_str) ||
5837 (!data->filter_str && data_test->filter_str))
5838 return false;
5839 }
52a7f16d
TZ		 5840
5841 for_each_hist_field(i, hist_data) {
5842 key_field = hist_data->fields[i];
5843 key_field_test = hist_data_test->fields[i];
5844
5845 if (key_field->flags != key_field_test->flags)
5846 return false;
5463bfda 5847 if (!compatible_field(key_field->field, key_field_test->field))
52a7f16d
TZ		 5848 return false;
5849 if (key_field->offset != key_field_test->offset)
5850 return false;
ad42febe
TZ		 5851 if (key_field->size != key_field_test->size)
5852 return false;
5853 if (key_field->is_signed != key_field_test->is_signed)
5854 return false;
1a361dfc
TZ		 5855 if (!!key_field->var.name != !!key_field_test->var.name)
5856 return false;
5857 if (key_field->var.name &&
5858 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5859 return false;
52a7f16d
TZ		 5860 }
5861
5862 for (i = 0; i < hist_data->n_sort_keys; i++) {
5863 sort_key = &hist_data->sort_keys[i];
5864 sort_key_test = &hist_data_test->sort_keys[i];
5865
5866 if (sort_key->field_idx != sort_key_test->field_idx ||
5867 sort_key->descending != sort_key_test->descending)
5868 return false;
5869 }
5870
5463bfda 5871 if (!ignore_filter && data->filter_str &&
52a7f16d
TZ		 5872 (strcmp(data->filter_str, data_test->filter_str) != 0))
5873 return false;
5874
48f79473
TZ		 5875 if (!actions_match(hist_data, hist_data_test))
5876 return false;
5877
52a7f16d
TZ		 5878 return true;
5879}
5880
7ef224d1
TZ		 5881static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5882 struct event_trigger_data *data,
5883 struct trace_event_file *file)
5884{
83e99914 5885 struct hist_trigger_data *hist_data = data->private_data;
5463bfda 5886 struct event_trigger_data *test, *named_data = NULL;
d0cd871b 5887 struct trace_array *tr = file->tr;
7ef224d1
TZ		 5888 int ret = 0;
5889
5463bfda
TZ		 5890 if (hist_data->attrs->name) {
5891 named_data = find_named_trigger(hist_data->attrs->name);
5892 if (named_data) {
5893 if (!hist_trigger_match(data, named_data, named_data,
5894 true)) {
d0cd871b 5895 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5463bfda
TZ		 5896 ret = -EINVAL;
5897 goto out;
5898 }
5899 }
5900 }
5901
5902 if (hist_data->attrs->name && !named_data)
5903 goto new;
5904
7ef224d1
TZ		 5905 list_for_each_entry_rcu(test, &file->triggers, list) {
5906 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 5907 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d 5908 continue;
83e99914
TZ		 5909 if (hist_data->attrs->pause)
5910 test->paused = true;
5911 else if (hist_data->attrs->cont)
5912 test->paused = false;
e86ae9ba
TZ		 5913 else if (hist_data->attrs->clear)
5914 hist_clear(test);
f404da6e 5915 else {
d0cd871b 5916 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
83e99914 5917 ret = -EEXIST;
f404da6e 5918 }
7ef224d1
TZ		 5919 goto out;
5920 }
5921 }
5463bfda 5922 new:
e86ae9ba 5923 if (hist_data->attrs->cont || hist_data->attrs->clear) {
d0cd871b 5924 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
83e99914
TZ		 5925 ret = -ENOENT;
5926 goto out;
5927 }
5928
7522c03a
TZ		 5929 if (hist_data->attrs->pause)
5930 data->paused = true;
5931
5463bfda 5932 if (named_data) {
5463bfda
TZ		 5933 data->private_data = named_data->private_data;
5934 set_named_trigger_data(data, named_data);
5935 data->ops = &event_hist_trigger_named_ops;
5936 }
5937
7ef224d1
TZ		 5938 if (data->ops->init) {
5939 ret = data->ops->init(data->ops, data);
5940 if (ret < 0)
5941 goto out;
5942 }
5943
a4072fe8
TZ		 5944 if (hist_data->enable_timestamps) {
5945 char *clock = hist_data->attrs->clock;
5946
5947 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5948 if (ret) {
d0cd871b 5949 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
a4072fe8
TZ		 5950 goto out;
5951 }
7ef224d1 5952
ad42febe 5953 tracing_set_time_stamp_abs(file->tr, true);
a4072fe8
TZ		 5954 }
5955
5956 if (named_data)
5957 destroy_hist_data(hist_data);
5958
5959 ret++;
067fe038
TZ		 5960 out:
5961 return ret;
5962}
5963
5964static int hist_trigger_enable(struct event_trigger_data *data,
5965 struct trace_event_file *file)
5966{
5967 int ret = 0;
5968
5969 list_add_tail_rcu(&data->list, &file->triggers);
5970
5971 update_cond_flag(file);
ad42febe 5972
7ef224d1
TZ		 5973 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5974 list_del_rcu(&data->list);
5975 update_cond_flag(file);
5976 ret--;
5977 }
067fe038 5978
7ef224d1
TZ		 5979 return ret;
5980}
5981
4b147936
TZ		 5982static bool have_hist_trigger_match(struct event_trigger_data *data,
5983 struct trace_event_file *file)
5984{
5985 struct hist_trigger_data *hist_data = data->private_data;
5986 struct event_trigger_data *test, *named_data = NULL;
5987 bool match = false;
5988
5989 if (hist_data->attrs->name)
5990 named_data = find_named_trigger(hist_data->attrs->name);
5991
5992 list_for_each_entry_rcu(test, &file->triggers, list) {
5993 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5994 if (hist_trigger_match(data, test, named_data, false)) {
5995 match = true;
5996 break;
5997 }
5998 }
5999 }
6000
6001 return match;
6002}
6003
067fe038
TZ		 6004static bool hist_trigger_check_refs(struct event_trigger_data *data,
6005 struct trace_event_file *file)
6006{
6007 struct hist_trigger_data *hist_data = data->private_data;
6008 struct event_trigger_data *test, *named_data = NULL;
6009
6010 if (hist_data->attrs->name)
6011 named_data = find_named_trigger(hist_data->attrs->name);
6012
6013 list_for_each_entry_rcu(test, &file->triggers, list) {
6014 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6015 if (!hist_trigger_match(data, test, named_data, false))
6016 continue;
6017 hist_data = test->private_data;
6018 if (check_var_refs(hist_data))
6019 return true;
6020 break;
6021 }
6022 }
6023
6024 return false;
6025}
6026
52a7f16d
TZ		 6027static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
6028 struct event_trigger_data *data,
6029 struct trace_event_file *file)
6030{
5463bfda
TZ		 6031 struct hist_trigger_data *hist_data = data->private_data;
6032 struct event_trigger_data *test, *named_data = NULL;
52a7f16d
TZ		 6033 bool unregistered = false;
6034
5463bfda
TZ		 6035 if (hist_data->attrs->name)
6036 named_data = find_named_trigger(hist_data->attrs->name);
6037
52a7f16d
TZ		 6038 list_for_each_entry_rcu(test, &file->triggers, list) {
6039 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5463bfda 6040 if (!hist_trigger_match(data, test, named_data, false))
52a7f16d
TZ		 6041 continue;
6042 unregistered = true;
6043 list_del_rcu(&test->list);
6044 trace_event_trigger_enable_disable(file, 0);
6045 update_cond_flag(file);
6046 break;
6047 }
6048 }
6049
6050 if (unregistered && test->ops->free)
6051 test->ops->free(test->ops, test);
ad42febe
TZ		 6052
6053 if (hist_data->enable_timestamps) {
30350d65 6054 if (!hist_data->remove || unregistered)
ad42febe
TZ		 6055 tracing_set_time_stamp_abs(file->tr, false);
6056 }
52a7f16d
TZ		 6057}
6058
067fe038
TZ		 6059static bool hist_file_check_refs(struct trace_event_file *file)
6060{
6061 struct hist_trigger_data *hist_data;
6062 struct event_trigger_data *test;
6063
6064 list_for_each_entry_rcu(test, &file->triggers, list) {
6065 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6066 hist_data = test->private_data;
6067 if (check_var_refs(hist_data))
6068 return true;
6069 }
6070 }
6071
6072 return false;
6073}
6074
52a7f16d
TZ		 6075static void hist_unreg_all(struct trace_event_file *file)
6076{
47c18569 6077 struct event_trigger_data *test, *n;
ad42febe 6078 struct hist_trigger_data *hist_data;
4b147936
TZ		 6079 struct synth_event *se;
6080 const char *se_name;
52a7f16d 6081
0e2b81f7
MH		 6082 lockdep_assert_held(&event_mutex);
6083
067fe038
TZ		 6084 if (hist_file_check_refs(file))
6085 return;
6086
47c18569 6087 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d 6088 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
ad42febe 6089 hist_data = test->private_data;
52a7f16d
TZ		 6090 list_del_rcu(&test->list);
6091 trace_event_trigger_enable_disable(file, 0);
4b147936 6092
4b147936
TZ		 6093 se_name = trace_event_name(file->event_call);
6094 se = find_synth_event(se_name);
6095 if (se)
6096 se->ref--;
4b147936 6097
52a7f16d 6098 update_cond_flag(file);
ad42febe
TZ		 6099 if (hist_data->enable_timestamps)
6100 tracing_set_time_stamp_abs(file->tr, false);
52a7f16d
TZ		 6101 if (test->ops->free)
6102 test->ops->free(test->ops, test);
6103 }
6104 }
6105}
6106
7ef224d1
TZ		 6107static int event_hist_trigger_func(struct event_command *cmd_ops,
6108 struct trace_event_file *file,
6109 char *glob, char *cmd, char *param)
6110{
6111 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6112 struct event_trigger_data *trigger_data;
6113 struct hist_trigger_attrs *attrs;
6114 struct event_trigger_ops *trigger_ops;
6115 struct hist_trigger_data *hist_data;
4b147936
TZ		 6116 struct synth_event *se;
6117 const char *se_name;
30350d65 6118 bool remove = false;
ec5ce098 6119 char *trigger, *p;
7ef224d1
TZ		 6120 int ret = 0;
6121
0e2b81f7
MH		 6122 lockdep_assert_held(&event_mutex);
6123
f404da6e 6124 if (glob && strlen(glob)) {
f404da6e 6125 hist_err_clear();
a1a05bb4 6126 last_cmd_set(file, param);
f404da6e
TZ		 6127 }
6128
7ef224d1
TZ		 6129 if (!param)
6130 return -EINVAL;
6131
30350d65
TZ		 6132 if (glob[0] == '!')
6133 remove = true;
6134
ec5ce098
TZ		 6135 /*
6136 * separate the trigger from the filter (k:v [if filter])
6137 * allowing for whitespace in the trigger
6138 */
6139 p = trigger = param;
6140 do {
6141 p = strstr(p, "if");
6142 if (!p)
6143 break;
6144 if (p == param)
6145 return -EINVAL;
6146 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6147 p++;
6148 continue;
6149 }
2f31ed93 6150 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
ec5ce098 6151 return -EINVAL;
2f31ed93 6152 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
ec5ce098
TZ		 6153 p++;
6154 continue;
6155 }
6156 break;
6157 } while (p);
6158
6159 if (!p)
6160 param = NULL;
6161 else {
6162 *(p - 1) = '\0';
6163 param = strstrip(p);
6164 trigger = strstrip(trigger);
6165 }
7ef224d1 6166
d0cd871b 6167 attrs = parse_hist_trigger_attrs(file->tr, trigger);
7ef224d1
TZ		 6168 if (IS_ERR(attrs))
6169 return PTR_ERR(attrs);
6170
6171 if (attrs->map_bits)
6172 hist_trigger_bits = attrs->map_bits;
6173
30350d65 6174 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
7ef224d1
TZ		 6175 if (IS_ERR(hist_data)) {
6176 destroy_hist_trigger_attrs(attrs);
6177 return PTR_ERR(hist_data);
6178 }
6179
6180 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
6181
7ef224d1 6182 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
4b147936
TZ		 6183 if (!trigger_data) {
6184 ret = -ENOMEM;
7ef224d1 6185 goto out_free;
4b147936 6186 }
7ef224d1
TZ		 6187
6188 trigger_data->count = -1;
6189 trigger_data->ops = trigger_ops;
6190 trigger_data->cmd_ops = cmd_ops;
6191
6192 INIT_LIST_HEAD(&trigger_data->list);
6193 RCU_INIT_POINTER(trigger_data->filter, NULL);
6194
6195 trigger_data->private_data = hist_data;
6196
52a7f16d
TZ		 6197 /* if param is non-empty, it's supposed to be a filter */
6198 if (param && cmd_ops->set_filter) {
6199 ret = cmd_ops->set_filter(param, trigger_data, file);
6200 if (ret < 0)
6201 goto out_free;
6202 }
6203
30350d65 6204 if (remove) {
4b147936
TZ		 6205 if (!have_hist_trigger_match(trigger_data, file))
6206 goto out_free;
6207
067fe038
TZ		 6208 if (hist_trigger_check_refs(trigger_data, file)) {
6209 ret = -EBUSY;
6210 goto out_free;
6211 }
6212
7ef224d1 6213 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
4b147936
TZ		 6214 se_name = trace_event_name(file->event_call);
6215 se = find_synth_event(se_name);
6216 if (se)
6217 se->ref--;
7ef224d1
TZ		 6218 ret = 0;
6219 goto out_free;
6220 }
6221
7ef224d1
TZ		 6222 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
6223 /*
6224 * The above returns on success the # of triggers registered,
6225 * but if it didn't register any it returns zero. Consider no
6226 * triggers registered a failure too.
6227 */
6228 if (!ret) {
e86ae9ba 6229 if (!(attrs->pause || attrs->cont || attrs->clear))
83e99914 6230 ret = -ENOENT;
7ef224d1
TZ		 6231 goto out_free;
6232 } else if (ret < 0)
6233 goto out_free;
067fe038
TZ		 6234
6235 if (get_named_trigger_data(trigger_data))
6236 goto enable;
6237
6238 if (has_hist_vars(hist_data))
6239 save_hist_vars(hist_data);
6240
7d18a10c 6241 ret = create_actions(hist_data);
0212e2aa
TZ		 6242 if (ret)
6243 goto out_unreg;
6244
067fe038
TZ		 6245 ret = tracing_map_init(hist_data->map);
6246 if (ret)
6247 goto out_unreg;
6248enable:
6249 ret = hist_trigger_enable(trigger_data, file);
6250 if (ret)
6251 goto out_unreg;
6252
4b147936
TZ		 6253 se_name = trace_event_name(file->event_call);
6254 se = find_synth_event(se_name);
6255 if (se)
6256 se->ref++;
7ef224d1
TZ		 6257 /* Just return zero, not the number of registered triggers */
6258 ret = 0;
6259 out:
f404da6e
TZ		 6260 if (ret == 0)
6261 hist_err_clear();
6262
7ef224d1 6263 return ret;
067fe038
TZ		 6264 out_unreg:
6265 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
7ef224d1
TZ		 6266 out_free:
6267 if (cmd_ops->set_filter)
6268 cmd_ops->set_filter(NULL, trigger_data, NULL);
6269
067fe038
TZ		 6270 remove_hist_vars(hist_data);
6271
7ef224d1
TZ		 6272 kfree(trigger_data);
6273
6274 destroy_hist_data(hist_data);
6275 goto out;
6276}
6277
6278static struct event_command trigger_hist_cmd = {
6279 .name = "hist",
6280 .trigger_type = ETT_EVENT_HIST,
6281 .flags = EVENT_CMD_FL_NEEDS_REC,
6282 .func = event_hist_trigger_func,
6283 .reg = hist_register_trigger,
52a7f16d
TZ		 6284 .unreg = hist_unregister_trigger,
6285 .unreg_all = hist_unreg_all,
7ef224d1
TZ		 6286 .get_trigger_ops = event_hist_get_trigger_ops,
6287 .set_filter = set_trigger_filter,
6288};
6289
6290__init int register_trigger_hist_cmd(void)
6291{
6292 int ret;
6293
6294 ret = register_event_command(&trigger_hist_cmd);
6295 WARN_ON(ret < 0);
6296
6297 return ret;
6298}
d0bad49b
TZ		 6299
6300static void
1ac4f51c
TZ		 6301hist_enable_trigger(struct event_trigger_data *data, void *rec,
6302 struct ring_buffer_event *event)
d0bad49b
TZ		 6303{
6304 struct enable_trigger_data *enable_data = data->private_data;
6305 struct event_trigger_data *test;
6306
6307 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
6308 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6309 if (enable_data->enable)
6310 test->paused = false;
6311 else
6312 test->paused = true;
d0bad49b
TZ		 6313 }
6314 }
6315}
6316
6317static void
1ac4f51c
TZ		 6318hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
6319 struct ring_buffer_event *event)
d0bad49b
TZ		 6320{
6321 if (!data->count)
6322 return;
6323
6324 if (data->count != -1)
6325 (data->count)--;
6326
1ac4f51c 6327 hist_enable_trigger(data, rec, event);
d0bad49b
TZ		 6328}
6329
6330static struct event_trigger_ops hist_enable_trigger_ops = {
6331 .func = hist_enable_trigger,
6332 .print = event_enable_trigger_print,
6333 .init = event_trigger_init,
6334 .free = event_enable_trigger_free,
6335};
6336
6337static struct event_trigger_ops hist_enable_count_trigger_ops = {
6338 .func = hist_enable_count_trigger,
6339 .print = event_enable_trigger_print,
6340 .init = event_trigger_init,
6341 .free = event_enable_trigger_free,
6342};
6343
6344static struct event_trigger_ops hist_disable_trigger_ops = {
6345 .func = hist_enable_trigger,
6346 .print = event_enable_trigger_print,
6347 .init = event_trigger_init,
6348 .free = event_enable_trigger_free,
6349};
6350
6351static struct event_trigger_ops hist_disable_count_trigger_ops = {
6352 .func = hist_enable_count_trigger,
6353 .print = event_enable_trigger_print,
6354 .init = event_trigger_init,
6355 .free = event_enable_trigger_free,
6356};
6357
6358static struct event_trigger_ops *
6359hist_enable_get_trigger_ops(char *cmd, char *param)
6360{
6361 struct event_trigger_ops *ops;
6362 bool enable;
6363
6364 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6365
6366 if (enable)
6367 ops = param ? &hist_enable_count_trigger_ops :
6368 &hist_enable_trigger_ops;
6369 else
6370 ops = param ? &hist_disable_count_trigger_ops :
6371 &hist_disable_trigger_ops;
6372
6373 return ops;
6374}
6375
52a7f16d
TZ		 6376static void hist_enable_unreg_all(struct trace_event_file *file)
6377{
47c18569 6378 struct event_trigger_data *test, *n;
52a7f16d 6379
47c18569 6380 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d
TZ		 6381 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6382 list_del_rcu(&test->list);
6383 update_cond_flag(file);
6384 trace_event_trigger_enable_disable(file, 0);
6385 if (test->ops->free)
6386 test->ops->free(test->ops, test);
6387 }
6388 }
6389}
6390
d0bad49b
TZ		 6391static struct event_command trigger_hist_enable_cmd = {
6392 .name = ENABLE_HIST_STR,
6393 .trigger_type = ETT_HIST_ENABLE,
6394 .func = event_enable_trigger_func,
6395 .reg = event_enable_register_trigger,
6396 .unreg = event_enable_unregister_trigger,
52a7f16d 6397 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6398 .get_trigger_ops = hist_enable_get_trigger_ops,
6399 .set_filter = set_trigger_filter,
6400};
6401
6402static struct event_command trigger_hist_disable_cmd = {
6403 .name = DISABLE_HIST_STR,
6404 .trigger_type = ETT_HIST_ENABLE,
6405 .func = event_enable_trigger_func,
6406 .reg = event_enable_register_trigger,
6407 .unreg = event_enable_unregister_trigger,
52a7f16d 6408 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6409 .get_trigger_ops = hist_enable_get_trigger_ops,
6410 .set_filter = set_trigger_filter,
6411};
6412
6413static __init void unregister_trigger_hist_enable_disable_cmds(void)
6414{
6415 unregister_event_command(&trigger_hist_enable_cmd);
6416 unregister_event_command(&trigger_hist_disable_cmd);
6417}
6418
6419__init int register_trigger_hist_enable_disable_cmds(void)
6420{
6421 int ret;
6422
6423 ret = register_event_command(&trigger_hist_enable_cmd);
6424 if (WARN_ON(ret < 0))
6425 return ret;
6426 ret = register_event_command(&trigger_hist_disable_cmd);
6427 if (WARN_ON(ret < 0))
6428 unregister_trigger_hist_enable_disable_cmds();
6429
6430 return ret;
6431}
4b147936
TZ		 6432
6433static __init int trace_events_hist_init(void)
6434{
6435 struct dentry *entry = NULL;
6436 struct dentry *d_tracer;
6437 int err = 0;
6438
7bbab38d
MH		 6439 err = dyn_event_register(&synth_event_ops);
6440 if (err) {
6441 pr_warn("Could not register synth_event_ops\n");
6442 return err;
6443 }
6444
4b147936
TZ		 6445 d_tracer = tracing_init_dentry();
6446 if (IS_ERR(d_tracer)) {
6447 err = PTR_ERR(d_tracer);
6448 goto err;
6449 }
6450
6451 entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
6452 NULL, &synth_events_fops);
6453 if (!entry) {
6454 err = -ENODEV;
6455 goto err;
6456 }
6457
6458 return err;
6459 err:
6460 pr_warn("Could not create tracefs 'synthetic_events' entry\n");
6461
6462 return err;
6463}
6464
6465fs_initcall(trace_events_hist_init);
Linux 6.x block layer and io_uring tree(s)