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prlimit: do_prlimit needs to have a speculation check
[linux-2.6-block.git] / kernel / trace / trace_events_hist.c
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bcea3f96 1// SPDX-License-Identifier: GPL-2.0
7ef224d1
TZ		 2/*
3 * trace_events_hist - trace event hist triggers
4 *
7ef224d1
TZ		 5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
6 */
7
8#include <linux/module.h>
9#include <linux/kallsyms.h>
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 21#include "tracing_map.h"
726721a5 22#include "trace_synth.h"
4b147936 23
d566c5e9
TZ		 24#define ERRORS \
25 C(NONE, "No error"), \
26 C(DUPLICATE_VAR, "Variable already defined"), \
27 C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
28 C(TOO_MANY_VARS, "Too many variables defined"), \
29 C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
30 C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
31 C(TRIGGER_EEXIST, "Hist trigger already exists"), \
32 C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
33 C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
34 C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
35 C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
36 C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
37 C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
38 C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
39 C(HIST_NOT_FOUND, "Matching event histogram not found"), \
40 C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
41 C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
42 C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
43 C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
44 C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
45 C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
46 C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
47 C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
48 C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
49 C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
50 C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
51 C(TOO_MANY_PARAMS, "Too many action params"), \
52 C(PARAM_NOT_FOUND, "Couldn't find param"), \
53 C(INVALID_PARAM, "Invalid action param"), \
54 C(ACTION_NOT_FOUND, "No action found"), \
55 C(NO_SAVE_PARAMS, "No params found for save()"), \
56 C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
57 C(ACTION_MISMATCH, "Handler doesn't support action"), \
58 C(NO_CLOSING_PAREN, "No closing paren found"), \
59 C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
60 C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
c8d94a18 61 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
d566c5e9 62 C(VAR_NOT_FOUND, "Couldn't find variable"), \
4de26c8c
TZ		 63 C(FIELD_NOT_FOUND, "Couldn't find field"), \
64 C(EMPTY_ASSIGNMENT, "Empty assignment"), \
65 C(INVALID_SORT_MODIFIER,"Invalid sort modifier"), \
66 C(EMPTY_SORT_FIELD, "Empty sort field"), \
67 C(TOO_MANY_SORT_FIELDS, "Too many sort fields (Max = 2)"), \
a9d10ca4 68 C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \
52cfb373 69 C(INVALID_STR_OPERAND, "String type can not be an operand in expression"), \
9710b2f3 70 C(EXPECT_NUMBER, "Expecting numeric literal"), \
8b5d46fd 71 C(UNARY_MINUS_SUBEXPR, "Unary minus not supported in sub-expressions"), \
ccf47f5c
MHG		 72 C(DIVISION_BY_ZERO, "Division by zero"), \
73 C(NEED_NOHC_VAL, "Non-hitcount value is required for 'nohitcount'"),
d566c5e9
TZ		 74
75#undef C
76#define C(a, b) HIST_ERR_##a
77
78enum { ERRORS };
79
80#undef C
81#define C(a, b) b
82
83static const char *err_text[] = { ERRORS };
84
7ef224d1
TZ		 85struct hist_field;
86
df35d93b
TZ		 87typedef u64 (*hist_field_fn_t) (struct hist_field *field,
88 struct tracing_map_elt *elt,
b47e3302 89 struct trace_buffer *buffer,
df35d93b
TZ		 90 struct ring_buffer_event *rbe,
91 void *event);
7ef224d1 92
5819eadd 93#define HIST_FIELD_OPERANDS_MAX 2
30350d65 94#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
0212e2aa 95#define HIST_ACTIONS_MAX 8
52cfb373 96#define HIST_CONST_DIGITS_MAX 21
8b5d46fd 97#define HIST_DIV_SHIFT 20 /* For optimizing division by constants */
30350d65 98
100719dc
TZ		 99enum field_op_id {
100 FIELD_OP_NONE,
101 FIELD_OP_PLUS,
102 FIELD_OP_MINUS,
103 FIELD_OP_UNARY_MINUS,
bcef0441
KS		 104 FIELD_OP_DIV,
105 FIELD_OP_MULT,
100719dc
TZ		 106};
107
86087383
SRG		 108enum hist_field_fn {
109 HIST_FIELD_FN_NOP,
110 HIST_FIELD_FN_VAR_REF,
111 HIST_FIELD_FN_COUNTER,
112 HIST_FIELD_FN_CONST,
113 HIST_FIELD_FN_LOG2,
114 HIST_FIELD_FN_BUCKET,
115 HIST_FIELD_FN_TIMESTAMP,
116 HIST_FIELD_FN_CPU,
117 HIST_FIELD_FN_STRING,
118 HIST_FIELD_FN_DYNSTRING,
119 HIST_FIELD_FN_RELDYNSTRING,
120 HIST_FIELD_FN_PSTRING,
121 HIST_FIELD_FN_S64,
122 HIST_FIELD_FN_U64,
123 HIST_FIELD_FN_S32,
124 HIST_FIELD_FN_U32,
125 HIST_FIELD_FN_S16,
126 HIST_FIELD_FN_U16,
127 HIST_FIELD_FN_S8,
128 HIST_FIELD_FN_U8,
129 HIST_FIELD_FN_UMINUS,
130 HIST_FIELD_FN_MINUS,
131 HIST_FIELD_FN_PLUS,
132 HIST_FIELD_FN_DIV,
133 HIST_FIELD_FN_MULT,
134 HIST_FIELD_FN_DIV_POWER2,
135 HIST_FIELD_FN_DIV_NOT_POWER2,
136 HIST_FIELD_FN_DIV_MULT_SHIFT,
137 HIST_FIELD_FN_EXECNAME,
138};
139
05ddb25c
TZ		 140/*
141 * A hist_var (histogram variable) contains variable information for
142 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
143 * flag set. A hist_var has a variable name e.g. ts0, and is
144 * associated with a given histogram trigger, as specified by
145 * hist_data. The hist_var idx is the unique index assigned to the
146 * variable by the hist trigger's tracing_map. The idx is what is
147 * used to set a variable's value and, by a variable reference, to
148 * retrieve it.
149 */
30350d65
TZ		 150struct hist_var {
151 char *name;
152 struct hist_trigger_data *hist_data;
153 unsigned int idx;
154};
5819eadd 155
7ef224d1
TZ		 156struct hist_field {
157 struct ftrace_event_field *field;
158 unsigned long flags;
de9a48a3 159 unsigned long buckets;
19a9facd 160 const char *type;
5819eadd 161 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
b559d003 162 struct hist_trigger_data *hist_data;
86087383
SRG		 163 enum hist_field_fn fn_num;
164 unsigned int ref;
165 unsigned int size;
166 unsigned int offset;
167 unsigned int is_signed;
05ddb25c
TZ		 168
169 /*
170 * Variable fields contain variable-specific info in var.
171 */
30350d65 172 struct hist_var var;
100719dc 173 enum field_op_id operator;
067fe038
TZ		 174 char *system;
175 char *event_name;
05ddb25c
TZ		 176
177 /*
178 * The name field is used for EXPR and VAR_REF fields. VAR
179 * fields contain the variable name in var.name.
180 */
100719dc 181 char *name;
05ddb25c
TZ		 182
183 /*
184 * When a histogram trigger is hit, if it has any references
185 * to variables, the values of those variables are collected
186 * into a var_ref_vals array by resolve_var_refs(). The
187 * current value of each variable is read from the tracing_map
188 * using the hist field's hist_var.idx and entered into the
189 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
190 */
067fe038
TZ		 191 unsigned int var_ref_idx;
192 bool read_once;
63a1e5de
TZ		 193
194 unsigned int var_str_idx;
52cfb373
KS		 195
196 /* Numeric literals are represented as u64 */
197 u64 constant;
8b5d46fd
KS		 198 /* Used to optimize division by constants */
199 u64 div_multiplier;
7ef224d1
TZ		 200};
201
86087383
SRG		 202static u64 hist_fn_call(struct hist_field *hist_field,
203 struct tracing_map_elt *elt,
204 struct trace_buffer *buffer,
205 struct ring_buffer_event *rbe,
206 void *event);
69a0200c 207
52cfb373
KS		 208static u64 hist_field_const(struct hist_field *field,
209 struct tracing_map_elt *elt,
210 struct trace_buffer *buffer,
211 struct ring_buffer_event *rbe,
212 void *event)
213{
214 return field->constant;
215}
216
df35d93b
TZ		 217static u64 hist_field_counter(struct hist_field *field,
218 struct tracing_map_elt *elt,
b47e3302 219 struct trace_buffer *buffer,
df35d93b
TZ		 220 struct ring_buffer_event *rbe,
221 void *event)
7ef224d1
TZ		 222{
223 return 1;
224}
225
df35d93b
TZ		 226static u64 hist_field_string(struct hist_field *hist_field,
227 struct tracing_map_elt *elt,
b47e3302 228 struct trace_buffer *buffer,
df35d93b
TZ		 229 struct ring_buffer_event *rbe,
230 void *event)
7ef224d1
TZ		 231{
232 char *addr = (char *)(event + hist_field->field->offset);
233
234 return (u64)(unsigned long)addr;
235}
236
df35d93b
TZ		 237static u64 hist_field_dynstring(struct hist_field *hist_field,
238 struct tracing_map_elt *elt,
b47e3302 239 struct trace_buffer *buffer,
df35d93b
TZ		 240 struct ring_buffer_event *rbe,
241 void *event)
79e577cb
NK		 242{
243 u32 str_item = *(u32 *)(event + hist_field->field->offset);
244 int str_loc = str_item & 0xffff;
245 char *addr = (char *)(event + str_loc);
246
247 return (u64)(unsigned long)addr;
248}
249
05770dd0
MH		 250static u64 hist_field_reldynstring(struct hist_field *hist_field,
251 struct tracing_map_elt *elt,
252 struct trace_buffer *buffer,
253 struct ring_buffer_event *rbe,
254 void *event)
255{
256 u32 *item = event + hist_field->field->offset;
257 u32 str_item = *item;
258 int str_loc = str_item & 0xffff;
259 char *addr = (char *)&item[1] + str_loc;
260
261 return (u64)(unsigned long)addr;
262}
263
df35d93b
TZ		 264static u64 hist_field_pstring(struct hist_field *hist_field,
265 struct tracing_map_elt *elt,
b47e3302 266 struct trace_buffer *buffer,
df35d93b
TZ		 267 struct ring_buffer_event *rbe,
268 void *event)
79e577cb
NK		 269{
270 char **addr = (char **)(event + hist_field->field->offset);
271
272 return (u64)(unsigned long)*addr;
273}
274
df35d93b
TZ		 275static u64 hist_field_log2(struct hist_field *hist_field,
276 struct tracing_map_elt *elt,
b47e3302 277 struct trace_buffer *buffer,
df35d93b
TZ		 278 struct ring_buffer_event *rbe,
279 void *event)
4b94f5b7 280{
5819eadd
TZ		 281 struct hist_field *operand = hist_field->operands[0];
282
86087383 283 u64 val = hist_fn_call(operand, elt, buffer, rbe, event);
4b94f5b7
NK		 284
285 return (u64) ilog2(roundup_pow_of_two(val));
286}
287
de9a48a3
SRV		 288static u64 hist_field_bucket(struct hist_field *hist_field,
289 struct tracing_map_elt *elt,
290 struct trace_buffer *buffer,
291 struct ring_buffer_event *rbe,
292 void *event)
293{
294 struct hist_field *operand = hist_field->operands[0];
295 unsigned long buckets = hist_field->buckets;
296
86087383 297 u64 val = hist_fn_call(operand, elt, buffer, rbe, event);
de9a48a3
SRV		 298
299 if (WARN_ON_ONCE(!buckets))
300 return val;
301
302 if (val >= LONG_MAX)
303 val = div64_ul(val, buckets);
304 else
305 val = (u64)((unsigned long)val / buckets);
306 return val * buckets;
307}
308
df35d93b
TZ		 309static u64 hist_field_plus(struct hist_field *hist_field,
310 struct tracing_map_elt *elt,
b47e3302 311 struct trace_buffer *buffer,
df35d93b
TZ		 312 struct ring_buffer_event *rbe,
313 void *event)
100719dc
TZ		 314{
315 struct hist_field *operand1 = hist_field->operands[0];
316 struct hist_field *operand2 = hist_field->operands[1];
317
86087383
SRG		 318 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
319 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
100719dc
TZ		 320
321 return val1 + val2;
322}
323
df35d93b
TZ		 324static u64 hist_field_minus(struct hist_field *hist_field,
325 struct tracing_map_elt *elt,
b47e3302 326 struct trace_buffer *buffer,
df35d93b
TZ		 327 struct ring_buffer_event *rbe,
328 void *event)
100719dc
TZ		 329{
330 struct hist_field *operand1 = hist_field->operands[0];
331 struct hist_field *operand2 = hist_field->operands[1];
332
86087383
SRG		 333 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
334 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
100719dc
TZ		 335
336 return val1 - val2;
337}
338
bcef0441
KS		 339static u64 hist_field_div(struct hist_field *hist_field,
340 struct tracing_map_elt *elt,
341 struct trace_buffer *buffer,
342 struct ring_buffer_event *rbe,
343 void *event)
344{
345 struct hist_field *operand1 = hist_field->operands[0];
346 struct hist_field *operand2 = hist_field->operands[1];
347
86087383
SRG		 348 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
349 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
bcef0441
KS		 350
351 /* Return -1 for the undefined case */
352 if (!val2)
353 return -1;
354
722eddaa
KS		 355 /* Use shift if the divisor is a power of 2 */
356 if (!(val2 & (val2 - 1)))
357 return val1 >> __ffs64(val2);
358
bcef0441
KS		 359 return div64_u64(val1, val2);
360}
361
8b5d46fd
KS		 362static u64 div_by_power_of_two(struct hist_field *hist_field,
363 struct tracing_map_elt *elt,
364 struct trace_buffer *buffer,
365 struct ring_buffer_event *rbe,
366 void *event)
367{
368 struct hist_field *operand1 = hist_field->operands[0];
369 struct hist_field *operand2 = hist_field->operands[1];
370
86087383 371 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
8b5d46fd
KS		 372
373 return val1 >> __ffs64(operand2->constant);
374}
375
376static u64 div_by_not_power_of_two(struct hist_field *hist_field,
377 struct tracing_map_elt *elt,
378 struct trace_buffer *buffer,
379 struct ring_buffer_event *rbe,
380 void *event)
381{
382 struct hist_field *operand1 = hist_field->operands[0];
383 struct hist_field *operand2 = hist_field->operands[1];
384
86087383 385 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
8b5d46fd
KS		 386
387 return div64_u64(val1, operand2->constant);
388}
389
390static u64 div_by_mult_and_shift(struct hist_field *hist_field,
391 struct tracing_map_elt *elt,
392 struct trace_buffer *buffer,
393 struct ring_buffer_event *rbe,
394 void *event)
395{
396 struct hist_field *operand1 = hist_field->operands[0];
397 struct hist_field *operand2 = hist_field->operands[1];
398
86087383 399 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
8b5d46fd
KS		 400
401 /*
402 * If the divisor is a constant, do a multiplication and shift instead.
403 *
404 * Choose Z = some power of 2. If Y <= Z, then:
405 * X / Y = (X * (Z / Y)) / Z
406 *
407 * (Z / Y) is a constant (mult) which is calculated at parse time, so:
408 * X / Y = (X * mult) / Z
409 *
410 * The division by Z can be replaced by a shift since Z is a power of 2:
411 * X / Y = (X * mult) >> HIST_DIV_SHIFT
412 *
413 * As long, as X < Z the results will not be off by more than 1.
414 */
415 if (val1 < (1 << HIST_DIV_SHIFT)) {
416 u64 mult = operand2->div_multiplier;
417
418 return (val1 * mult + ((1 << HIST_DIV_SHIFT) - 1)) >> HIST_DIV_SHIFT;
419 }
420
421 return div64_u64(val1, operand2->constant);
422}
423
bcef0441
KS		 424static u64 hist_field_mult(struct hist_field *hist_field,
425 struct tracing_map_elt *elt,
426 struct trace_buffer *buffer,
427 struct ring_buffer_event *rbe,
428 void *event)
429{
430 struct hist_field *operand1 = hist_field->operands[0];
431 struct hist_field *operand2 = hist_field->operands[1];
432
86087383
SRG		 433 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
434 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
bcef0441
KS		 435
436 return val1 * val2;
437}
438
df35d93b
TZ		 439static u64 hist_field_unary_minus(struct hist_field *hist_field,
440 struct tracing_map_elt *elt,
b47e3302 441 struct trace_buffer *buffer,
df35d93b
TZ		 442 struct ring_buffer_event *rbe,
443 void *event)
100719dc
TZ		 444{
445 struct hist_field *operand = hist_field->operands[0];
446
86087383 447 s64 sval = (s64)hist_fn_call(operand, elt, buffer, rbe, event);
100719dc
TZ		 448 u64 val = (u64)-sval;
449
450 return val;
451}
452
7ef224d1 453#define DEFINE_HIST_FIELD_FN(type) \
fbd302cb 454 static u64 hist_field_##type(struct hist_field *hist_field, \
df35d93b 455 struct tracing_map_elt *elt, \
b47e3302 456 struct trace_buffer *buffer, \
df35d93b
TZ		 457 struct ring_buffer_event *rbe, \
458 void *event) \
7ef224d1
TZ		 459{ \
460 type *addr = (type *)(event + hist_field->field->offset); \
461 \
79e577cb 462 return (u64)(unsigned long)*addr; \
7ef224d1
TZ		 463}
464
465DEFINE_HIST_FIELD_FN(s64);
466DEFINE_HIST_FIELD_FN(u64);
467DEFINE_HIST_FIELD_FN(s32);
468DEFINE_HIST_FIELD_FN(u32);
469DEFINE_HIST_FIELD_FN(s16);
470DEFINE_HIST_FIELD_FN(u16);
471DEFINE_HIST_FIELD_FN(s8);
472DEFINE_HIST_FIELD_FN(u8);
473
474#define for_each_hist_field(i, hist_data) \
475 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
476
477#define for_each_hist_val_field(i, hist_data) \
478 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
479
480#define for_each_hist_key_field(i, hist_data) \
481 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
482
69a0200c
TZ		 483#define HIST_STACKTRACE_DEPTH 16
484#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
485#define HIST_STACKTRACE_SKIP 5
486
7ef224d1 487#define HITCOUNT_IDX 0
69a0200c 488#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
7ef224d1
TZ		 489
490enum hist_field_flags {
0d7a8325
TZ		 491 HIST_FIELD_FL_HITCOUNT = 1 << 0,
492 HIST_FIELD_FL_KEY = 1 << 1,
493 HIST_FIELD_FL_STRING = 1 << 2,
494 HIST_FIELD_FL_HEX = 1 << 3,
495 HIST_FIELD_FL_SYM = 1 << 4,
496 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
497 HIST_FIELD_FL_EXECNAME = 1 << 6,
498 HIST_FIELD_FL_SYSCALL = 1 << 7,
499 HIST_FIELD_FL_STACKTRACE = 1 << 8,
500 HIST_FIELD_FL_LOG2 = 1 << 9,
ad42febe 501 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
860f9f6b 502 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
30350d65 503 HIST_FIELD_FL_VAR = 1 << 12,
100719dc 504 HIST_FIELD_FL_EXPR = 1 << 13,
067fe038 505 HIST_FIELD_FL_VAR_REF = 1 << 14,
8b7622bf 506 HIST_FIELD_FL_CPU = 1 << 15,
7e8b88a3 507 HIST_FIELD_FL_ALIAS = 1 << 16,
de9a48a3 508 HIST_FIELD_FL_BUCKET = 1 << 17,
52cfb373 509 HIST_FIELD_FL_CONST = 1 << 18,
abaa5258 510 HIST_FIELD_FL_PERCENT = 1 << 19,
a2c54256 511 HIST_FIELD_FL_GRAPH = 1 << 20,
30350d65
TZ		 512};
513
514struct var_defs {
515 unsigned int n_vars;
516 char *name[TRACING_MAP_VARS_MAX];
517 char *expr[TRACING_MAP_VARS_MAX];
7ef224d1
TZ		 518};
519
520struct hist_trigger_attrs {
521 char *keys_str;
f2606835 522 char *vals_str;
e62347d2 523 char *sort_key_str;
5463bfda 524 char *name;
a4072fe8 525 char *clock;
83e99914
TZ		 526 bool pause;
527 bool cont;
e86ae9ba 528 bool clear;
860f9f6b 529 bool ts_in_usecs;
ccf47f5c 530 bool no_hitcount;
7ef224d1 531 unsigned int map_bits;
30350d65
TZ		 532
533 char *assignment_str[TRACING_MAP_VARS_MAX];
534 unsigned int n_assignments;
535
0212e2aa
TZ		 536 char *action_str[HIST_ACTIONS_MAX];
537 unsigned int n_actions;
538
30350d65 539 struct var_defs var_defs;
7ef224d1
TZ		 540};
541
02205a67
TZ		 542struct field_var {
543 struct hist_field *var;
544 struct hist_field *val;
545};
546
547struct field_var_hist {
548 struct hist_trigger_data *hist_data;
549 char *cmd;
550};
551
7ef224d1 552struct hist_trigger_data {
30350d65 553 struct hist_field *fields[HIST_FIELDS_MAX];
7ef224d1
TZ		 554 unsigned int n_vals;
555 unsigned int n_keys;
556 unsigned int n_fields;
30350d65 557 unsigned int n_vars;
63a1e5de 558 unsigned int n_var_str;
7ef224d1
TZ		 559 unsigned int key_size;
560 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
561 unsigned int n_sort_keys;
562 struct trace_event_file *event_file;
563 struct hist_trigger_attrs *attrs;
564 struct tracing_map *map;
ad42febe 565 bool enable_timestamps;
30350d65 566 bool remove;
067fe038
TZ		 567 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
568 unsigned int n_var_refs;
0212e2aa
TZ		 569
570 struct action_data *actions[HIST_ACTIONS_MAX];
571 unsigned int n_actions;
02205a67
TZ		 572
573 struct field_var *field_vars[SYNTH_FIELDS_MAX];
574 unsigned int n_field_vars;
575 unsigned int n_field_var_str;
576 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
577 unsigned int n_field_var_hists;
50450603 578
7d18a10c
TZ		 579 struct field_var *save_vars[SYNTH_FIELDS_MAX];
580 unsigned int n_save_vars;
581 unsigned int n_save_var_str;
0212e2aa
TZ		 582};
583
584struct action_data;
585
586typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
b47e3302
SRV		 587 struct tracing_map_elt *elt,
588 struct trace_buffer *buffer, void *rec,
7d18a10c 589 struct ring_buffer_event *rbe, void *key,
0212e2aa
TZ		 590 struct action_data *data, u64 *var_ref_vals);
591
466f4528
TZ		 592typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
593
7d18a10c
TZ		 594enum handler_id {
595 HANDLER_ONMATCH = 1,
596 HANDLER_ONMAX,
dff81f55 597 HANDLER_ONCHANGE,
7d18a10c
TZ		 598};
599
600enum action_id {
601 ACTION_SAVE = 1,
602 ACTION_TRACE,
a3785b7e 603 ACTION_SNAPSHOT,
7d18a10c
TZ		 604};
605
0212e2aa 606struct action_data {
7d18a10c
TZ		 607 enum handler_id handler;
608 enum action_id action;
609 char *action_name;
0212e2aa 610 action_fn_t fn;
7d18a10c 611
c282a386
TZ		 612 unsigned int n_params;
613 char *params[SYNTH_FIELDS_MAX];
614
c3e49506
TZ		 615 /*
616 * When a histogram trigger is hit, the values of any
617 * references to variables, including variables being passed
618 * as parameters to synthetic events, are collected into a
d380dcde
TZ		 619 * var_ref_vals array. This var_ref_idx array is an array of
620 * indices into the var_ref_vals array, one for each synthetic
621 * event param, and is passed to the synthetic event
622 * invocation.
c3e49506 623 */
82470f7d 624 unsigned int var_ref_idx[SYNTH_FIELDS_MAX];
c3e49506 625 struct synth_event *synth_event;
e91eefd7
TZ		 626 bool use_trace_keyword;
627 char *synth_event_name;
c3e49506 628
c282a386
TZ		 629 union {
630 struct {
c3e49506 631 char *event;
726721a5
TZ		 632 char *event_system;
633 } match_data;
8dcc53ad 634
726721a5
TZ		 635 struct {
636 /*
637 * var_str contains the $-unstripped variable
638 * name referenced by var_ref, and used when
639 * printing the action. Because var_ref
640 * creation is deferred to create_actions(),
641 * we need a per-action way to save it until
642 * then, thus var_str.
643 */
644 char *var_str;
8dcc53ad 645
726721a5
TZ		 646 /*
647 * var_ref refers to the variable being
648 * tracked e.g onmax($var).
649 */
650 struct hist_field *var_ref;
249d7b2e 651
726721a5
TZ		 652 /*
653 * track_var contains the 'invisible' tracking
654 * variable created to keep the current
655 * e.g. max value.
656 */
657 struct hist_field *track_var;
249d7b2e 658
726721a5
TZ		 659 check_track_val_fn_t check_val;
660 action_fn_t save_data;
661 } track_data;
662 };
663};
8dcc53ad 664
726721a5
TZ		 665struct track_data {
666 u64 track_val;
667 bool updated;
249d7b2e 668
726721a5
TZ		 669 unsigned int key_len;
670 void *key;
671 struct tracing_map_elt elt;
249d7b2e 672
726721a5
TZ		 673 struct action_data *action_data;
674 struct hist_trigger_data *hist_data;
675};
8dcc53ad 676
726721a5
TZ		 677struct hist_elt_data {
678 char *comm;
679 u64 *var_ref_vals;
c910db94
TZ		 680 char **field_var_str;
681 int n_field_var_str;
726721a5 682};
8dcc53ad 683
726721a5
TZ		 684struct snapshot_context {
685 struct tracing_map_elt *elt;
686 void *key;
687};
1d9d4c90 688
8b5d46fd
KS		 689/*
690 * Returns the specific division function to use if the divisor
691 * is constant. This avoids extra branches when the trigger is hit.
692 */
86087383 693static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor)
8b5d46fd
KS		 694{
695 u64 div = divisor->constant;
696
697 if (!(div & (div - 1)))
86087383 698 return HIST_FIELD_FN_DIV_POWER2;
8b5d46fd
KS		 699
700 /* If the divisor is too large, do a regular division */
701 if (div > (1 << HIST_DIV_SHIFT))
86087383 702 return HIST_FIELD_FN_DIV_NOT_POWER2;
8b5d46fd
KS		 703
704 divisor->div_multiplier = div64_u64((u64)(1 << HIST_DIV_SHIFT), div);
86087383 705 return HIST_FIELD_FN_DIV_MULT_SHIFT;
8b5d46fd
KS		 706}
707
726721a5
TZ		 708static void track_data_free(struct track_data *track_data)
709{
710 struct hist_elt_data *elt_data;
1d9d4c90 711
726721a5
TZ		 712 if (!track_data)
713 return;
1d9d4c90 714
726721a5
TZ		 715 kfree(track_data->key);
716
717 elt_data = track_data->elt.private_data;
718 if (elt_data) {
719 kfree(elt_data->comm);
720 kfree(elt_data);
1d9d4c90 721 }
8dcc53ad 722
726721a5 723 kfree(track_data);
8dcc53ad 724}
8dcc53ad 725
726721a5
TZ		 726static struct track_data *track_data_alloc(unsigned int key_len,
727 struct action_data *action_data,
728 struct hist_trigger_data *hist_data)
8dcc53ad 729{
726721a5
TZ		 730 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
731 struct hist_elt_data *elt_data;
8dcc53ad 732
726721a5
TZ		 733 if (!data)
734 return ERR_PTR(-ENOMEM);
8dcc53ad 735
726721a5
TZ		 736 data->key = kzalloc(key_len, GFP_KERNEL);
737 if (!data->key) {
738 track_data_free(data);
739 return ERR_PTR(-ENOMEM);
740 }
8dcc53ad 741
726721a5
TZ		 742 data->key_len = key_len;
743 data->action_data = action_data;
744 data->hist_data = hist_data;
8dcc53ad 745
726721a5
TZ		 746 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
747 if (!elt_data) {
748 track_data_free(data);
749 return ERR_PTR(-ENOMEM);
750 }
4b147936 751
726721a5 752 data->elt.private_data = elt_data;
4b147936 753
726721a5
TZ		 754 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
755 if (!elt_data->comm) {
756 track_data_free(data);
757 return ERR_PTR(-ENOMEM);
7bbab38d 758 }
7bbab38d 759
726721a5
TZ		 760 return data;
761}
7bbab38d 762
edfeed31
TZ		 763#define HIST_PREFIX "hist:"
764
765static char *last_cmd;
726721a5 766static char last_cmd_loc[MAX_FILTER_STR_VAL];
7bbab38d 767
726721a5
TZ		 768static int errpos(char *str)
769{
edfeed31
TZ		 770 if (!str || !last_cmd)
771 return 0;
772
726721a5 773 return err_pos(last_cmd, str);
4b147936
TZ		 774}
775
726721a5 776static void last_cmd_set(struct trace_event_file *file, char *str)
4b147936 777{
726721a5
TZ		 778 const char *system = NULL, *name = NULL;
779 struct trace_event_call *call;
9f8e5aee 780 int len;
4b147936 781
726721a5
TZ		 782 if (!str)
783 return;
4b147936 784
5677a3d7
SRG		 785 /* sizeof() contains the nul byte */
786 len = sizeof(HIST_PREFIX) + strlen(str);
edfeed31
TZ		 787 kfree(last_cmd);
788 last_cmd = kzalloc(len, GFP_KERNEL);
789 if (!last_cmd)
790 return;
791
792 strcpy(last_cmd, HIST_PREFIX);
5677a3d7
SRG		 793 /* Again, sizeof() contains the nul byte */
794 len -= sizeof(HIST_PREFIX);
9f8e5aee 795 strncat(last_cmd, str, len);
4b147936 796
726721a5
TZ		 797 if (file) {
798 call = file->event_call;
799 system = call->class->system;
800 if (system) {
801 name = trace_event_name(call);
802 if (!name)
803 system = NULL;
804 }
4b147936
TZ		 805 }
806
726721a5 807 if (system)
edfeed31 808 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, HIST_PREFIX "%s:%s", system, name);
4b147936
TZ		 809}
810
edfeed31 811static void hist_err(struct trace_array *tr, u8 err_type, u16 err_pos)
7bbab38d 812{
edfeed31
TZ		 813 if (!last_cmd)
814 return;
815
726721a5
TZ		 816 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
817 err_type, err_pos);
7bbab38d
MH		 818}
819
726721a5 820static void hist_err_clear(void)
7bbab38d 821{
edfeed31
TZ		 822 if (last_cmd)
823 last_cmd[0] = '\0';
726721a5 824 last_cmd_loc[0] = '\0';
7bbab38d
MH		 825}
826
726721a5
TZ		 827typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
828 unsigned int *var_ref_idx);
4b147936 829
726721a5
TZ		 830static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
831 unsigned int *var_ref_idx)
4b147936 832{
726721a5 833 struct tracepoint *tp = event->tp;
4b147936 834
726721a5
TZ		 835 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
836 struct tracepoint_func *probe_func_ptr;
837 synth_probe_func_t probe_func;
838 void *__data;
17911ff3 839
726721a5
TZ		 840 if (!(cpu_online(raw_smp_processor_id())))
841 return;
4b147936 842
726721a5
TZ		 843 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
844 if (probe_func_ptr) {
845 do {
846 probe_func = probe_func_ptr->func;
847 __data = probe_func_ptr->data;
848 probe_func(__data, var_ref_vals, var_ref_idx);
849 } while ((++probe_func_ptr)->func);
850 }
851 }
4b147936
TZ		 852}
853
726721a5 854static void action_trace(struct hist_trigger_data *hist_data,
b47e3302
SRV		 855 struct tracing_map_elt *elt,
856 struct trace_buffer *buffer, void *rec,
726721a5
TZ		 857 struct ring_buffer_event *rbe, void *key,
858 struct action_data *data, u64 *var_ref_vals)
4b147936 859{
726721a5
TZ		 860 struct synth_event *event = data->synth_event;
861
862 trace_synth(event, var_ref_vals, data->var_ref_idx);
4b147936
TZ		 863}
864
726721a5
TZ		 865struct hist_var_data {
866 struct list_head list;
867 struct hist_trigger_data *hist_data;
4b147936
TZ		 868};
869
df35d93b
TZ		 870static u64 hist_field_timestamp(struct hist_field *hist_field,
871 struct tracing_map_elt *elt,
b47e3302 872 struct trace_buffer *buffer,
df35d93b
TZ		 873 struct ring_buffer_event *rbe,
874 void *event)
860f9f6b
TZ		 875{
876 struct hist_trigger_data *hist_data = hist_field->hist_data;
877 struct trace_array *tr = hist_data->event_file->tr;
878
efe6196a 879 u64 ts = ring_buffer_event_time_stamp(buffer, rbe);
860f9f6b
TZ		 880
881 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
882 ts = ns2usecs(ts);
883
884 return ts;
885}
886
8b7622bf
TZ		 887static u64 hist_field_cpu(struct hist_field *hist_field,
888 struct tracing_map_elt *elt,
b47e3302 889 struct trace_buffer *buffer,
8b7622bf
TZ		 890 struct ring_buffer_event *rbe,
891 void *event)
892{
893 int cpu = smp_processor_id();
894
895 return cpu;
896}
897
de40f033
TZ		 898/**
899 * check_field_for_var_ref - Check if a VAR_REF field references a variable
900 * @hist_field: The VAR_REF field to check
901 * @var_data: The hist trigger that owns the variable
902 * @var_idx: The trigger variable identifier
903 *
904 * Check the given VAR_REF field to see whether or not it references
905 * the given variable associated with the given trigger.
906 *
907 * Return: The VAR_REF field if it does reference the variable, NULL if not
908 */
067fe038
TZ		 909static struct hist_field *
910check_field_for_var_ref(struct hist_field *hist_field,
911 struct hist_trigger_data *var_data,
912 unsigned int var_idx)
913{
e4f6d245 914 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
067fe038 915
e4f6d245
TZ		 916 if (hist_field && hist_field->var.idx == var_idx &&
917 hist_field->var.hist_data == var_data)
918 return hist_field;
067fe038 919
e4f6d245 920 return NULL;
067fe038
TZ		 921}
922
de40f033
TZ		 923/**
924 * find_var_ref - Check if a trigger has a reference to a trigger variable
925 * @hist_data: The hist trigger that might have a reference to the variable
926 * @var_data: The hist trigger that owns the variable
927 * @var_idx: The trigger variable identifier
928 *
929 * Check the list of var_refs[] on the first hist trigger to see
930 * whether any of them are references to the variable on the second
931 * trigger.
932 *
933 * Return: The VAR_REF field referencing the variable if so, NULL if not
934 */
067fe038
TZ		 935static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
936 struct hist_trigger_data *var_data,
937 unsigned int var_idx)
938{
e4f6d245 939 struct hist_field *hist_field;
067fe038
TZ		 940 unsigned int i;
941
e4f6d245
TZ		 942 for (i = 0; i < hist_data->n_var_refs; i++) {
943 hist_field = hist_data->var_refs[i];
944 if (check_field_for_var_ref(hist_field, var_data, var_idx))
945 return hist_field;
067fe038
TZ		 946 }
947
e4f6d245 948 return NULL;
067fe038
TZ		 949}
950
de40f033
TZ		 951/**
952 * find_any_var_ref - Check if there is a reference to a given trigger variable
953 * @hist_data: The hist trigger
954 * @var_idx: The trigger variable identifier
955 *
956 * Check to see whether the given variable is currently referenced by
957 * any other trigger.
958 *
959 * The trigger the variable is defined on is explicitly excluded - the
960 * assumption being that a self-reference doesn't prevent a trigger
961 * from being removed.
962 *
963 * Return: The VAR_REF field referencing the variable if so, NULL if not
964 */
067fe038
TZ		 965static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
966 unsigned int var_idx)
967{
968 struct trace_array *tr = hist_data->event_file->tr;
969 struct hist_field *found = NULL;
970 struct hist_var_data *var_data;
971
972 list_for_each_entry(var_data, &tr->hist_vars, list) {
973 if (var_data->hist_data == hist_data)
974 continue;
975 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
976 if (found)
977 break;
978 }
979
980 return found;
981}
982
de40f033
TZ		 983/**
984 * check_var_refs - Check if there is a reference to any of trigger's variables
985 * @hist_data: The hist trigger
986 *
987 * A trigger can define one or more variables. If any one of them is
988 * currently referenced by any other trigger, this function will
989 * determine that.
0a068f4a 990 *
de40f033
TZ		 991 * Typically used to determine whether or not a trigger can be removed
992 * - if there are any references to a trigger's variables, it cannot.
993 *
994 * Return: True if there is a reference to any of trigger's variables
995 */
067fe038
TZ		 996static bool check_var_refs(struct hist_trigger_data *hist_data)
997{
998 struct hist_field *field;
999 bool found = false;
1000 int i;
1001
1002 for_each_hist_field(i, hist_data) {
1003 field = hist_data->fields[i];
1004 if (field && field->flags & HIST_FIELD_FL_VAR) {
1005 if (find_any_var_ref(hist_data, field->var.idx)) {
1006 found = true;
1007 break;
1008 }
1009 }
1010 }
1011
1012 return found;
1013}
1014
1015static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1016{
1017 struct trace_array *tr = hist_data->event_file->tr;
1018 struct hist_var_data *var_data, *found = NULL;
1019
1020 list_for_each_entry(var_data, &tr->hist_vars, list) {
1021 if (var_data->hist_data == hist_data) {
1022 found = var_data;
1023 break;
1024 }
1025 }
1026
1027 return found;
1028}
1029
1030static bool field_has_hist_vars(struct hist_field *hist_field,
1031 unsigned int level)
1032{
1033 int i;
1034
1035 if (level > 3)
1036 return false;
1037
1038 if (!hist_field)
1039 return false;
1040
1041 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1042 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1043 return true;
1044
1045 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1046 struct hist_field *operand;
1047
1048 operand = hist_field->operands[i];
1049 if (field_has_hist_vars(operand, level + 1))
1050 return true;
1051 }
1052
1053 return false;
1054}
1055
1056static bool has_hist_vars(struct hist_trigger_data *hist_data)
1057{
1058 struct hist_field *hist_field;
1059 int i;
1060
1061 for_each_hist_field(i, hist_data) {
1062 hist_field = hist_data->fields[i];
1063 if (field_has_hist_vars(hist_field, 0))
1064 return true;
1065 }
1066
1067 return false;
1068}
1069
1070static int save_hist_vars(struct hist_trigger_data *hist_data)
1071{
1072 struct trace_array *tr = hist_data->event_file->tr;
1073 struct hist_var_data *var_data;
1074
1075 var_data = find_hist_vars(hist_data);
1076 if (var_data)
1077 return 0;
1078
8530dec6 1079 if (tracing_check_open_get_tr(tr))
067fe038
TZ		 1080 return -ENODEV;
1081
1082 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1083 if (!var_data) {
1084 trace_array_put(tr);
1085 return -ENOMEM;
1086 }
1087
1088 var_data->hist_data = hist_data;
1089 list_add(&var_data->list, &tr->hist_vars);
1090
1091 return 0;
1092}
1093
1094static void remove_hist_vars(struct hist_trigger_data *hist_data)
1095{
1096 struct trace_array *tr = hist_data->event_file->tr;
1097 struct hist_var_data *var_data;
1098
1099 var_data = find_hist_vars(hist_data);
1100 if (!var_data)
1101 return;
1102
1103 if (WARN_ON(check_var_refs(hist_data)))
1104 return;
1105
1106 list_del(&var_data->list);
1107
1108 kfree(var_data);
1109
1110 trace_array_put(tr);
1111}
1112
30350d65
TZ		 1113static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1114 const char *var_name)
1115{
1116 struct hist_field *hist_field, *found = NULL;
1117 int i;
1118
1119 for_each_hist_field(i, hist_data) {
1120 hist_field = hist_data->fields[i];
1121 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1122 strcmp(hist_field->var.name, var_name) == 0) {
1123 found = hist_field;
1124 break;
1125 }
1126 }
1127
1128 return found;
1129}
1130
1131static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1132 struct trace_event_file *file,
1133 const char *var_name)
1134{
1135 struct hist_trigger_data *test_data;
1136 struct event_trigger_data *test;
1137 struct hist_field *hist_field;
1138
aeed8aa3
MH		 1139 lockdep_assert_held(&event_mutex);
1140
30350d65
TZ		 1141 hist_field = find_var_field(hist_data, var_name);
1142 if (hist_field)
1143 return hist_field;
1144
aeed8aa3 1145 list_for_each_entry(test, &file->triggers, list) {
30350d65
TZ		 1146 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1147 test_data = test->private_data;
1148 hist_field = find_var_field(test_data, var_name);
1149 if (hist_field)
1150 return hist_field;
1151 }
1152 }
1153
1154 return NULL;
1155}
1156
067fe038
TZ		 1157static struct trace_event_file *find_var_file(struct trace_array *tr,
1158 char *system,
1159 char *event_name,
1160 char *var_name)
1161{
1162 struct hist_trigger_data *var_hist_data;
1163 struct hist_var_data *var_data;
1164 struct trace_event_file *file, *found = NULL;
1165
1166 if (system)
1167 return find_event_file(tr, system, event_name);
1168
1169 list_for_each_entry(var_data, &tr->hist_vars, list) {
1170 var_hist_data = var_data->hist_data;
1171 file = var_hist_data->event_file;
1172 if (file == found)
1173 continue;
1174
1175 if (find_var_field(var_hist_data, var_name)) {
f404da6e 1176 if (found) {
d0cd871b 1177 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
067fe038 1178 return NULL;
f404da6e 1179 }
067fe038
TZ		 1180
1181 found = file;
1182 }
1183 }
1184
1185 return found;
1186}
1187
1188static struct hist_field *find_file_var(struct trace_event_file *file,
1189 const char *var_name)
1190{
1191 struct hist_trigger_data *test_data;
1192 struct event_trigger_data *test;
1193 struct hist_field *hist_field;
1194
aeed8aa3
MH		 1195 lockdep_assert_held(&event_mutex);
1196
1197 list_for_each_entry(test, &file->triggers, list) {
067fe038
TZ		 1198 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1199 test_data = test->private_data;
1200 hist_field = find_var_field(test_data, var_name);
1201 if (hist_field)
1202 return hist_field;
1203 }
1204 }
1205
1206 return NULL;
1207}
1208
c282a386
TZ		 1209static struct hist_field *
1210find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1211{
1212 struct trace_array *tr = hist_data->event_file->tr;
1213 struct hist_field *hist_field, *found = NULL;
1214 struct trace_event_file *file;
1215 unsigned int i;
1216
1217 for (i = 0; i < hist_data->n_actions; i++) {
1218 struct action_data *data = hist_data->actions[i];
1219
7d18a10c 1220 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 1221 char *system = data->match_data.event_system;
1222 char *event_name = data->match_data.event;
c282a386
TZ		 1223
1224 file = find_var_file(tr, system, event_name, var_name);
1225 if (!file)
1226 continue;
1227 hist_field = find_file_var(file, var_name);
1228 if (hist_field) {
1229 if (found) {
d0cd871b
SRV		 1230 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1231 errpos(var_name));
c282a386
TZ		 1232 return ERR_PTR(-EINVAL);
1233 }
1234
1235 found = hist_field;
1236 }
1237 }
1238 }
1239 return found;
1240}
1241
067fe038
TZ		 1242static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1243 char *system,
1244 char *event_name,
1245 char *var_name)
1246{
1247 struct trace_array *tr = hist_data->event_file->tr;
1248 struct hist_field *hist_field = NULL;
1249 struct trace_event_file *file;
1250
c282a386
TZ		 1251 if (!system || !event_name) {
1252 hist_field = find_match_var(hist_data, var_name);
1253 if (IS_ERR(hist_field))
1254 return NULL;
1255 if (hist_field)
1256 return hist_field;
1257 }
1258
067fe038
TZ		 1259 file = find_var_file(tr, system, event_name, var_name);
1260 if (!file)
1261 return NULL;
1262
1263 hist_field = find_file_var(file, var_name);
1264
1265 return hist_field;
1266}
1267
067fe038
TZ		 1268static u64 hist_field_var_ref(struct hist_field *hist_field,
1269 struct tracing_map_elt *elt,
b47e3302 1270 struct trace_buffer *buffer,
067fe038
TZ		 1271 struct ring_buffer_event *rbe,
1272 void *event)
1273{
1274 struct hist_elt_data *elt_data;
1275 u64 var_val = 0;
1276
55267c88
TZ		 1277 if (WARN_ON_ONCE(!elt))
1278 return var_val;
1279
067fe038
TZ		 1280 elt_data = elt->private_data;
1281 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1282
1283 return var_val;
1284}
1285
1286static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1287 u64 *var_ref_vals, bool self)
1288{
1289 struct hist_trigger_data *var_data;
1290 struct tracing_map_elt *var_elt;
1291 struct hist_field *hist_field;
1292 unsigned int i, var_idx;
1293 bool resolved = true;
1294 u64 var_val = 0;
1295
1296 for (i = 0; i < hist_data->n_var_refs; i++) {
1297 hist_field = hist_data->var_refs[i];
1298 var_idx = hist_field->var.idx;
1299 var_data = hist_field->var.hist_data;
1300
1301 if (var_data == NULL) {
1302 resolved = false;
1303 break;
1304 }
1305
1306 if ((self && var_data != hist_data) ||
1307 (!self && var_data == hist_data))
1308 continue;
1309
1310 var_elt = tracing_map_lookup(var_data->map, key);
1311 if (!var_elt) {
1312 resolved = false;
1313 break;
1314 }
1315
1316 if (!tracing_map_var_set(var_elt, var_idx)) {
1317 resolved = false;
1318 break;
1319 }
1320
1321 if (self || !hist_field->read_once)
1322 var_val = tracing_map_read_var(var_elt, var_idx);
1323 else
1324 var_val = tracing_map_read_var_once(var_elt, var_idx);
1325
1326 var_ref_vals[i] = var_val;
1327 }
1328
1329 return resolved;
1330}
1331
85013256
TZ		 1332static const char *hist_field_name(struct hist_field *field,
1333 unsigned int level)
1334{
1335 const char *field_name = "";
1336
1337 if (level > 1)
1338 return field_name;
1339
1340 if (field->field)
1341 field_name = field->field->name;
7e8b88a3 1342 else if (field->flags & HIST_FIELD_FL_LOG2 ||
de9a48a3
SRV		 1343 field->flags & HIST_FIELD_FL_ALIAS ||
1344 field->flags & HIST_FIELD_FL_BUCKET)
5819eadd 1345 field_name = hist_field_name(field->operands[0], ++level);
8b7622bf 1346 else if (field->flags & HIST_FIELD_FL_CPU)
1e3bac71 1347 field_name = "common_cpu";
067fe038
TZ		 1348 else if (field->flags & HIST_FIELD_FL_EXPR ||
1349 field->flags & HIST_FIELD_FL_VAR_REF) {
1350 if (field->system) {
1351 static char full_name[MAX_FILTER_STR_VAL];
1352
1353 strcat(full_name, field->system);
1354 strcat(full_name, ".");
1355 strcat(full_name, field->event_name);
1356 strcat(full_name, ".");
1357 strcat(full_name, field->name);
1358 field_name = full_name;
1359 } else
1360 field_name = field->name;
0ae7961e
TZ		 1361 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1362 field_name = "common_timestamp";
5f2e094e
TZ		 1363 else if (field->flags & HIST_FIELD_FL_HITCOUNT)
1364 field_name = "hitcount";
85013256
TZ		 1365
1366 if (field_name == NULL)
1367 field_name = "";
1368
1369 return field_name;
1370}
1371
86087383 1372static enum hist_field_fn select_value_fn(int field_size, int field_is_signed)
7ef224d1 1373{
7ef224d1
TZ		 1374 switch (field_size) {
1375 case 8:
1376 if (field_is_signed)
86087383 1377 return HIST_FIELD_FN_S64;
7ef224d1 1378 else
86087383 1379 return HIST_FIELD_FN_U64;
7ef224d1
TZ		 1380 case 4:
1381 if (field_is_signed)
86087383 1382 return HIST_FIELD_FN_S32;
7ef224d1 1383 else
86087383 1384 return HIST_FIELD_FN_U32;
7ef224d1
TZ		 1385 case 2:
1386 if (field_is_signed)
86087383 1387 return HIST_FIELD_FN_S16;
7ef224d1 1388 else
86087383 1389 return HIST_FIELD_FN_U16;
7ef224d1
TZ		 1390 case 1:
1391 if (field_is_signed)
86087383 1392 return HIST_FIELD_FN_S8;
7ef224d1 1393 else
86087383 1394 return HIST_FIELD_FN_U8;
7ef224d1
TZ		 1395 }
1396
86087383 1397 return HIST_FIELD_FN_NOP;
7ef224d1
TZ		 1398}
1399
1400static int parse_map_size(char *str)
1401{
1402 unsigned long size, map_bits;
1403 int ret;
1404
7ef224d1
TZ		 1405 ret = kstrtoul(str, 0, &size);
1406 if (ret)
1407 goto out;
1408
1409 map_bits = ilog2(roundup_pow_of_two(size));
1410 if (map_bits < TRACING_MAP_BITS_MIN ||
1411 map_bits > TRACING_MAP_BITS_MAX)
1412 ret = -EINVAL;
1413 else
1414 ret = map_bits;
1415 out:
1416 return ret;
1417}
1418
1419static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1420{
30350d65
TZ		 1421 unsigned int i;
1422
7ef224d1
TZ		 1423 if (!attrs)
1424 return;
1425
30350d65
TZ		 1426 for (i = 0; i < attrs->n_assignments; i++)
1427 kfree(attrs->assignment_str[i]);
1428
0212e2aa
TZ		 1429 for (i = 0; i < attrs->n_actions; i++)
1430 kfree(attrs->action_str[i]);
1431
5463bfda 1432 kfree(attrs->name);
e62347d2 1433 kfree(attrs->sort_key_str);
7ef224d1 1434 kfree(attrs->keys_str);
f2606835 1435 kfree(attrs->vals_str);
a4072fe8 1436 kfree(attrs->clock);
7ef224d1
TZ		 1437 kfree(attrs);
1438}
1439
0212e2aa
TZ		 1440static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1441{
c282a386 1442 int ret = -EINVAL;
0212e2aa
TZ		 1443
1444 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1445 return ret;
1446
754481e6 1447 if ((str_has_prefix(str, "onmatch(")) ||
dff81f55
TZ		 1448 (str_has_prefix(str, "onmax(")) ||
1449 (str_has_prefix(str, "onchange("))) {
c282a386
TZ		 1450 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1451 if (!attrs->action_str[attrs->n_actions]) {
1452 ret = -ENOMEM;
1453 return ret;
1454 }
1455 attrs->n_actions++;
1456 ret = 0;
1457 }
0212e2aa
TZ		 1458 return ret;
1459}
1460
d0cd871b
SRV		 1461static int parse_assignment(struct trace_array *tr,
1462 char *str, struct hist_trigger_attrs *attrs)
9b1ae035 1463{
b527b638 1464 int len, ret = 0;
9b1ae035 1465
b527b638
TZ		 1466 if ((len = str_has_prefix(str, "key=")) ||
1467 (len = str_has_prefix(str, "keys="))) {
1468 attrs->keys_str = kstrdup(str + len, GFP_KERNEL);
9b1ae035
TZ		 1469 if (!attrs->keys_str) {
1470 ret = -ENOMEM;
1471 goto out;
1472 }
b527b638
TZ		 1473 } else if ((len = str_has_prefix(str, "val=")) ||
1474 (len = str_has_prefix(str, "vals=")) ||
1475 (len = str_has_prefix(str, "values="))) {
1476 attrs->vals_str = kstrdup(str + len, GFP_KERNEL);
9b1ae035
TZ		 1477 if (!attrs->vals_str) {
1478 ret = -ENOMEM;
1479 goto out;
1480 }
b527b638
TZ		 1481 } else if ((len = str_has_prefix(str, "sort="))) {
1482 attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL);
9b1ae035
TZ		 1483 if (!attrs->sort_key_str) {
1484 ret = -ENOMEM;
1485 goto out;
1486 }
754481e6 1487 } else if (str_has_prefix(str, "name=")) {
9b1ae035
TZ		 1488 attrs->name = kstrdup(str, GFP_KERNEL);
1489 if (!attrs->name) {
1490 ret = -ENOMEM;
1491 goto out;
1492 }
b527b638
TZ		 1493 } else if ((len = str_has_prefix(str, "clock="))) {
1494 str += len;
a4072fe8
TZ		 1495
1496 str = strstrip(str);
1497 attrs->clock = kstrdup(str, GFP_KERNEL);
1498 if (!attrs->clock) {
1499 ret = -ENOMEM;
1500 goto out;
1501 }
b527b638
TZ		 1502 } else if ((len = str_has_prefix(str, "size="))) {
1503 int map_bits = parse_map_size(str + len);
9b1ae035
TZ		 1504
1505 if (map_bits < 0) {
1506 ret = map_bits;
1507 goto out;
1508 }
1509 attrs->map_bits = map_bits;
30350d65
TZ		 1510 } else {
1511 char *assignment;
1512
1513 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
d0cd871b 1514 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
30350d65
TZ		 1515 ret = -EINVAL;
1516 goto out;
1517 }
1518
1519 assignment = kstrdup(str, GFP_KERNEL);
1520 if (!assignment) {
1521 ret = -ENOMEM;
1522 goto out;
1523 }
1524
1525 attrs->assignment_str[attrs->n_assignments++] = assignment;
1526 }
9b1ae035
TZ		 1527 out:
1528 return ret;
1529}
1530
d0cd871b
SRV		 1531static struct hist_trigger_attrs *
1532parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
7ef224d1
TZ		 1533{
1534 struct hist_trigger_attrs *attrs;
1535 int ret = 0;
1536
1537 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1538 if (!attrs)
1539 return ERR_PTR(-ENOMEM);
1540
1541 while (trigger_str) {
1542 char *str = strsep(&trigger_str, ":");
b527b638 1543 char *rhs;
7ef224d1 1544
b527b638
TZ		 1545 rhs = strchr(str, '=');
1546 if (rhs) {
1547 if (!strlen(++rhs)) {
1548 ret = -EINVAL;
4de26c8c 1549 hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str));
b527b638
TZ		 1550 goto free;
1551 }
d0cd871b 1552 ret = parse_assignment(tr, str, attrs);
9b1ae035
TZ		 1553 if (ret)
1554 goto free;
ccf47f5c
MHG		 1555 } else if (strcmp(str, "nohitcount") == 0 ||
1556 strcmp(str, "NOHC") == 0)
1557 attrs->no_hitcount = true;
1558 else if (strcmp(str, "pause") == 0)
83e99914
TZ		 1559 attrs->pause = true;
1560 else if ((strcmp(str, "cont") == 0) ||
1561 (strcmp(str, "continue") == 0))
1562 attrs->cont = true;
e86ae9ba
TZ		 1563 else if (strcmp(str, "clear") == 0)
1564 attrs->clear = true;
9b1ae035 1565 else {
0212e2aa
TZ		 1566 ret = parse_action(str, attrs);
1567 if (ret)
1568 goto free;
7ef224d1
TZ		 1569 }
1570 }
1571
1572 if (!attrs->keys_str) {
1573 ret = -EINVAL;
1574 goto free;
1575 }
1576
a4072fe8
TZ		 1577 if (!attrs->clock) {
1578 attrs->clock = kstrdup("global", GFP_KERNEL);
1579 if (!attrs->clock) {
1580 ret = -ENOMEM;
1581 goto free;
1582 }
1583 }
1584
7ef224d1
TZ		 1585 return attrs;
1586 free:
1587 destroy_hist_trigger_attrs(attrs);
1588
1589 return ERR_PTR(ret);
1590}
1591
6b4827ad
TZ		 1592static inline void save_comm(char *comm, struct task_struct *task)
1593{
1594 if (!task->pid) {
1595 strcpy(comm, "<idle>");
1596 return;
1597 }
1598
1599 if (WARN_ON_ONCE(task->pid < 0)) {
1600 strcpy(comm, "<XXX>");
1601 return;
1602 }
1603
27242c62 1604 strncpy(comm, task->comm, TASK_COMM_LEN);
6b4827ad
TZ		 1605}
1606
af6a29bc
TZ		 1607static void hist_elt_data_free(struct hist_elt_data *elt_data)
1608{
02205a67
TZ		 1609 unsigned int i;
1610
c910db94 1611 for (i = 0; i < elt_data->n_field_var_str; i++)
02205a67
TZ		 1612 kfree(elt_data->field_var_str[i]);
1613
c910db94
TZ		 1614 kfree(elt_data->field_var_str);
1615
af6a29bc
TZ		 1616 kfree(elt_data->comm);
1617 kfree(elt_data);
1618}
1619
1620static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
6b4827ad 1621{
af6a29bc
TZ		 1622 struct hist_elt_data *elt_data = elt->private_data;
1623
1624 hist_elt_data_free(elt_data);
6b4827ad
TZ		 1625}
1626
af6a29bc 1627static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
6b4827ad
TZ		 1628{
1629 struct hist_trigger_data *hist_data = elt->map->private_data;
af6a29bc
TZ		 1630 unsigned int size = TASK_COMM_LEN;
1631 struct hist_elt_data *elt_data;
ed2cf907 1632 struct hist_field *hist_field;
02205a67 1633 unsigned int i, n_str;
6b4827ad 1634
af6a29bc
TZ		 1635 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
1636 if (!elt_data)
1637 return -ENOMEM;
1638
ed2cf907
SRV		 1639 for_each_hist_field(i, hist_data) {
1640 hist_field = hist_data->fields[i];
6b4827ad 1641
ed2cf907 1642 if (hist_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 1643 elt_data->comm = kzalloc(size, GFP_KERNEL);
1644 if (!elt_data->comm) {
1645 kfree(elt_data);
6b4827ad 1646 return -ENOMEM;
af6a29bc 1647 }
6b4827ad
TZ		 1648 break;
1649 }
1650 }
1651
63a1e5de
TZ		 1652 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str +
1653 hist_data->n_var_str;
1654 if (n_str > SYNTH_FIELDS_MAX) {
1655 hist_elt_data_free(elt_data);
1656 return -EINVAL;
1657 }
02205a67 1658
4a4a56b4
TZ		 1659 BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
1660
02205a67
TZ		 1661 size = STR_VAR_LEN_MAX;
1662
c910db94
TZ		 1663 elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL);
1664 if (!elt_data->field_var_str) {
1665 hist_elt_data_free(elt_data);
1666 return -EINVAL;
1667 }
1668 elt_data->n_field_var_str = n_str;
1669
02205a67
TZ		 1670 for (i = 0; i < n_str; i++) {
1671 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
1672 if (!elt_data->field_var_str[i]) {
1673 hist_elt_data_free(elt_data);
1674 return -ENOMEM;
1675 }
1676 }
1677
af6a29bc
TZ		 1678 elt->private_data = elt_data;
1679
6b4827ad
TZ		 1680 return 0;
1681}
1682
af6a29bc 1683static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
6b4827ad 1684{
af6a29bc 1685 struct hist_elt_data *elt_data = elt->private_data;
6b4827ad 1686
af6a29bc
TZ		 1687 if (elt_data->comm)
1688 save_comm(elt_data->comm, current);
6b4827ad
TZ		 1689}
1690
af6a29bc
TZ		 1691static const struct tracing_map_ops hist_trigger_elt_data_ops = {
1692 .elt_alloc = hist_trigger_elt_data_alloc,
1693 .elt_free = hist_trigger_elt_data_free,
1694 .elt_init = hist_trigger_elt_data_init,
6b4827ad
TZ		 1695};
1696
2ece94fb
TZ		 1697static const char *get_hist_field_flags(struct hist_field *hist_field)
1698{
1699 const char *flags_str = NULL;
1700
1701 if (hist_field->flags & HIST_FIELD_FL_HEX)
1702 flags_str = "hex";
1703 else if (hist_field->flags & HIST_FIELD_FL_SYM)
1704 flags_str = "sym";
1705 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
1706 flags_str = "sym-offset";
1707 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
1708 flags_str = "execname";
1709 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
1710 flags_str = "syscall";
1711 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
1712 flags_str = "log2";
de9a48a3
SRV		 1713 else if (hist_field->flags & HIST_FIELD_FL_BUCKET)
1714 flags_str = "buckets";
2ece94fb
TZ		 1715 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
1716 flags_str = "usecs";
abaa5258
MHG		 1717 else if (hist_field->flags & HIST_FIELD_FL_PERCENT)
1718 flags_str = "percent";
a2c54256
MHG		 1719 else if (hist_field->flags & HIST_FIELD_FL_GRAPH)
1720 flags_str = "graph";
2ece94fb
TZ		 1721
1722 return flags_str;
1723}
1724
100719dc
TZ		 1725static void expr_field_str(struct hist_field *field, char *expr)
1726{
067fe038
TZ		 1727 if (field->flags & HIST_FIELD_FL_VAR_REF)
1728 strcat(expr, "$");
52cfb373
KS		 1729 else if (field->flags & HIST_FIELD_FL_CONST) {
1730 char str[HIST_CONST_DIGITS_MAX];
1731
1732 snprintf(str, HIST_CONST_DIGITS_MAX, "%llu", field->constant);
1733 strcat(expr, str);
1734 }
067fe038 1735
100719dc
TZ		 1736 strcat(expr, hist_field_name(field, 0));
1737
76690945 1738 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
100719dc
TZ		 1739 const char *flags_str = get_hist_field_flags(field);
1740
1741 if (flags_str) {
1742 strcat(expr, ".");
1743 strcat(expr, flags_str);
1744 }
1745 }
1746}
1747
1748static char *expr_str(struct hist_field *field, unsigned int level)
1749{
1750 char *expr;
1751
1752 if (level > 1)
1753 return NULL;
1754
1755 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
1756 if (!expr)
1757 return NULL;
1758
1759 if (!field->operands[0]) {
1760 expr_field_str(field, expr);
1761 return expr;
1762 }
1763
1764 if (field->operator == FIELD_OP_UNARY_MINUS) {
1765 char *subexpr;
1766
1767 strcat(expr, "-(");
1768 subexpr = expr_str(field->operands[0], ++level);
1769 if (!subexpr) {
1770 kfree(expr);
1771 return NULL;
1772 }
1773 strcat(expr, subexpr);
1774 strcat(expr, ")");
1775
1776 kfree(subexpr);
1777
1778 return expr;
1779 }
1780
1781 expr_field_str(field->operands[0], expr);
1782
1783 switch (field->operator) {
1784 case FIELD_OP_MINUS:
1785 strcat(expr, "-");
1786 break;
1787 case FIELD_OP_PLUS:
1788 strcat(expr, "+");
1789 break;
bcef0441
KS		 1790 case FIELD_OP_DIV:
1791 strcat(expr, "/");
1792 break;
1793 case FIELD_OP_MULT:
1794 strcat(expr, "*");
1795 break;
100719dc
TZ		 1796 default:
1797 kfree(expr);
1798 return NULL;
1799 }
1800
1801 expr_field_str(field->operands[1], expr);
1802
1803 return expr;
1804}
1805
9710b2f3
KS		 1806/*
1807 * If field_op != FIELD_OP_NONE, *sep points to the root operator
1808 * of the expression tree to be evaluated.
1809 */
1810static int contains_operator(char *str, char **sep)
100719dc
TZ		 1811{
1812 enum field_op_id field_op = FIELD_OP_NONE;
9710b2f3 1813 char *minus_op, *plus_op, *div_op, *mult_op;
100719dc 1814
100719dc 1815
9710b2f3
KS		 1816 /*
1817 * Report the last occurrence of the operators first, so that the
1818 * expression is evaluated left to right. This is important since
1819 * subtraction and division are not associative.
1820 *
1821 * e.g
1822 * 64/8/4/2 is 1, i.e 64/8/4/2 = ((64/8)/4)/2
1823 * 14-7-5-2 is 0, i.e 14-7-5-2 = ((14-7)-5)-2
1824 */
100719dc 1825
9710b2f3
KS		 1826 /*
1827 * First, find lower precedence addition and subtraction
1828 * since the expression will be evaluated recursively.
1829 */
1830 minus_op = strrchr(str, '-');
1831 if (minus_op) {
26c56373 1832 /*
9710b2f3
KS		 1833 * Unary minus is not supported in sub-expressions. If
1834 * present, it is always the next root operator.
26c56373 1835 */
9710b2f3 1836 if (minus_op == str) {
100719dc 1837 field_op = FIELD_OP_UNARY_MINUS;
9710b2f3
KS		 1838 goto out;
1839 }
1840
1841 field_op = FIELD_OP_MINUS;
1842 }
1843
1844 plus_op = strrchr(str, '+');
1845 if (plus_op || minus_op) {
1846 /*
1847 * For operators of the same precedence use to rightmost as the
1848 * root, so that the expression is evaluated left to right.
1849 */
1850 if (plus_op > minus_op)
1851 field_op = FIELD_OP_PLUS;
1852 goto out;
1853 }
1854
1855 /*
1856 * Multiplication and division have higher precedence than addition and
1857 * subtraction.
1858 */
1859 div_op = strrchr(str, '/');
1860 if (div_op)
bcef0441 1861 field_op = FIELD_OP_DIV;
9710b2f3
KS		 1862
1863 mult_op = strrchr(str, '*');
1864 /*
1865 * For operators of the same precedence use to rightmost as the
1866 * root, so that the expression is evaluated left to right.
1867 */
1868 if (mult_op > div_op)
bcef0441 1869 field_op = FIELD_OP_MULT;
9710b2f3
KS		 1870
1871out:
1872 if (sep) {
1873 switch (field_op) {
1874 case FIELD_OP_UNARY_MINUS:
1875 case FIELD_OP_MINUS:
1876 *sep = minus_op;
1877 break;
1878 case FIELD_OP_PLUS:
1879 *sep = plus_op;
1880 break;
1881 case FIELD_OP_DIV:
1882 *sep = div_op;
1883 break;
1884 case FIELD_OP_MULT:
1885 *sep = mult_op;
1886 break;
1887 case FIELD_OP_NONE:
1888 default:
1889 *sep = NULL;
1890 break;
1891 }
100719dc
TZ		 1892 }
1893
1894 return field_op;
1895}
1896
8bcebc77
SRV		 1897static void get_hist_field(struct hist_field *hist_field)
1898{
1899 hist_field->ref++;
1900}
1901
656fe2ba
TZ		 1902static void __destroy_hist_field(struct hist_field *hist_field)
1903{
8bcebc77
SRV		 1904 if (--hist_field->ref > 1)
1905 return;
1906
656fe2ba
TZ		 1907 kfree(hist_field->var.name);
1908 kfree(hist_field->name);
3347d80b
SRV		 1909
1910 /* Can likely be a const */
1911 kfree_const(hist_field->type);
656fe2ba 1912
9da73974
VS		 1913 kfree(hist_field->system);
1914 kfree(hist_field->event_name);
1915
656fe2ba
TZ		 1916 kfree(hist_field);
1917}
1918
5819eadd
TZ		 1919static void destroy_hist_field(struct hist_field *hist_field,
1920 unsigned int level)
7ef224d1 1921{
5819eadd
TZ		 1922 unsigned int i;
1923
100719dc 1924 if (level > 3)
5819eadd
TZ		 1925 return;
1926
1927 if (!hist_field)
1928 return;
1929
656fe2ba
TZ		 1930 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
1931 return; /* var refs will be destroyed separately */
1932
5819eadd
TZ		 1933 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
1934 destroy_hist_field(hist_field->operands[i], level + 1);
1935
656fe2ba 1936 __destroy_hist_field(hist_field);
7ef224d1
TZ		 1937}
1938
b559d003
TZ		 1939static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
1940 struct ftrace_event_field *field,
30350d65
TZ		 1941 unsigned long flags,
1942 char *var_name)
7ef224d1
TZ		 1943{
1944 struct hist_field *hist_field;
1945
1946 if (field && is_function_field(field))
1947 return NULL;
1948
1949 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
1950 if (!hist_field)
1951 return NULL;
1952
8bcebc77
SRV		 1953 hist_field->ref = 1;
1954
b559d003
TZ		 1955 hist_field->hist_data = hist_data;
1956
7e8b88a3 1957 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
100719dc
TZ		 1958 goto out; /* caller will populate */
1959
067fe038 1960 if (flags & HIST_FIELD_FL_VAR_REF) {
86087383 1961 hist_field->fn_num = HIST_FIELD_FN_VAR_REF;
067fe038
TZ		 1962 goto out;
1963 }
1964
7ef224d1 1965 if (flags & HIST_FIELD_FL_HITCOUNT) {
86087383 1966 hist_field->fn_num = HIST_FIELD_FN_COUNTER;
19a9facd 1967 hist_field->size = sizeof(u64);
3347d80b 1968 hist_field->type = "u64";
7ef224d1
TZ		 1969 goto out;
1970 }
1971
52cfb373 1972 if (flags & HIST_FIELD_FL_CONST) {
86087383 1973 hist_field->fn_num = HIST_FIELD_FN_CONST;
52cfb373
KS		 1974 hist_field->size = sizeof(u64);
1975 hist_field->type = kstrdup("u64", GFP_KERNEL);
1976 if (!hist_field->type)
1977 goto free;
1978 goto out;
1979 }
1980
69a0200c 1981 if (flags & HIST_FIELD_FL_STACKTRACE) {
86087383 1982 hist_field->fn_num = HIST_FIELD_FN_NOP;
69a0200c
TZ		 1983 goto out;
1984 }
1985
de9a48a3
SRV		 1986 if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
1987 unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
86087383
SRG		 1988 hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 :
1989 HIST_FIELD_FN_BUCKET;
30350d65 1990 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
5819eadd 1991 hist_field->size = hist_field->operands[0]->size;
3347d80b 1992 hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
19a9facd
TZ		 1993 if (!hist_field->type)
1994 goto free;
4b94f5b7
NK		 1995 goto out;
1996 }
1997
ad42febe 1998 if (flags & HIST_FIELD_FL_TIMESTAMP) {
86087383 1999 hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP;
ad42febe 2000 hist_field->size = sizeof(u64);
3347d80b 2001 hist_field->type = "u64";
ad42febe
TZ		 2002 goto out;
2003 }
2004
8b7622bf 2005 if (flags & HIST_FIELD_FL_CPU) {
86087383 2006 hist_field->fn_num = HIST_FIELD_FN_CPU;
8b7622bf 2007 hist_field->size = sizeof(int);
3347d80b 2008 hist_field->type = "unsigned int";
8b7622bf
TZ		 2009 goto out;
2010 }
2011
432480c5
TZ		 2012 if (WARN_ON_ONCE(!field))
2013 goto out;
2014
704adfb5
SRV		 2015 /* Pointers to strings are just pointers and dangerous to dereference */
2016 if (is_string_field(field) &&
2017 (field->filter_type != FILTER_PTR_STRING)) {
7ef224d1 2018 flags |= HIST_FIELD_FL_STRING;
79e577cb 2019
19a9facd 2020 hist_field->size = MAX_FILTER_STR_VAL;
3347d80b 2021 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
19a9facd
TZ		 2022 if (!hist_field->type)
2023 goto free;
2024
63f84ae6 2025 if (field->filter_type == FILTER_STATIC_STRING) {
86087383 2026 hist_field->fn_num = HIST_FIELD_FN_STRING;
63f84ae6 2027 hist_field->size = field->size;
05770dd0 2028 } else if (field->filter_type == FILTER_DYN_STRING) {
86087383 2029 hist_field->fn_num = HIST_FIELD_FN_DYNSTRING;
05770dd0 2030 } else if (field->filter_type == FILTER_RDYN_STRING)
86087383 2031 hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING;
79e577cb 2032 else
86087383 2033 hist_field->fn_num = HIST_FIELD_FN_PSTRING;
7ef224d1 2034 } else {
19a9facd
TZ		 2035 hist_field->size = field->size;
2036 hist_field->is_signed = field->is_signed;
3347d80b 2037 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
19a9facd
TZ		 2038 if (!hist_field->type)
2039 goto free;
2040
86087383
SRG		 2041 hist_field->fn_num = select_value_fn(field->size,
2042 field->is_signed);
2043 if (hist_field->fn_num == HIST_FIELD_FN_NOP) {
5819eadd 2044 destroy_hist_field(hist_field, 0);
7ef224d1
TZ		 2045 return NULL;
2046 }
2047 }
2048 out:
2049 hist_field->field = field;
2050 hist_field->flags = flags;
2051
30350d65
TZ		 2052 if (var_name) {
2053 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2054 if (!hist_field->var.name)
2055 goto free;
2056 }
2057
7ef224d1 2058 return hist_field;
30350d65
TZ		 2059 free:
2060 destroy_hist_field(hist_field, 0);
2061 return NULL;
7ef224d1
TZ		 2062}
2063
2064static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2065{
2066 unsigned int i;
2067
30350d65 2068 for (i = 0; i < HIST_FIELDS_MAX; i++) {
7ef224d1 2069 if (hist_data->fields[i]) {
5819eadd 2070 destroy_hist_field(hist_data->fields[i], 0);
7ef224d1
TZ		 2071 hist_data->fields[i] = NULL;
2072 }
2073 }
656fe2ba
TZ		 2074
2075 for (i = 0; i < hist_data->n_var_refs; i++) {
2076 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2077 __destroy_hist_field(hist_data->var_refs[i]);
2078 hist_data->var_refs[i] = NULL;
2079 }
7ef224d1
TZ		 2080}
2081
067fe038
TZ		 2082static int init_var_ref(struct hist_field *ref_field,
2083 struct hist_field *var_field,
2084 char *system, char *event_name)
2085{
2086 int err = 0;
2087
2088 ref_field->var.idx = var_field->var.idx;
2089 ref_field->var.hist_data = var_field->hist_data;
2090 ref_field->size = var_field->size;
2091 ref_field->is_signed = var_field->is_signed;
2092 ref_field->flags |= var_field->flags &
2093 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2094
2095 if (system) {
2096 ref_field->system = kstrdup(system, GFP_KERNEL);
2097 if (!ref_field->system)
2098 return -ENOMEM;
2099 }
2100
2101 if (event_name) {
2102 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2103 if (!ref_field->event_name) {
2104 err = -ENOMEM;
2105 goto free;
2106 }
2107 }
2108
7e8b88a3
TZ		 2109 if (var_field->var.name) {
2110 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2111 if (!ref_field->name) {
2112 err = -ENOMEM;
2113 goto free;
2114 }
2115 } else if (var_field->name) {
2116 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2117 if (!ref_field->name) {
2118 err = -ENOMEM;
2119 goto free;
2120 }
067fe038
TZ		 2121 }
2122
3347d80b 2123 ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL);
067fe038
TZ		 2124 if (!ref_field->type) {
2125 err = -ENOMEM;
2126 goto free;
2127 }
2128 out:
2129 return err;
2130 free:
2131 kfree(ref_field->system);
99696a25 2132 ref_field->system = NULL;
067fe038 2133 kfree(ref_field->event_name);
99696a25 2134 ref_field->event_name = NULL;
067fe038 2135 kfree(ref_field->name);
99696a25 2136 ref_field->name = NULL;
067fe038
TZ		 2137
2138 goto out;
2139}
2140
d380dcde
TZ		 2141static int find_var_ref_idx(struct hist_trigger_data *hist_data,
2142 struct hist_field *var_field)
2143{
2144 struct hist_field *ref_field;
2145 int i;
2146
2147 for (i = 0; i < hist_data->n_var_refs; i++) {
2148 ref_field = hist_data->var_refs[i];
2149 if (ref_field->var.idx == var_field->var.idx &&
2150 ref_field->var.hist_data == var_field->hist_data)
2151 return i;
2152 }
2153
2154 return -ENOENT;
2155}
2156
de40f033
TZ		 2157/**
2158 * create_var_ref - Create a variable reference and attach it to trigger
2159 * @hist_data: The trigger that will be referencing the variable
2160 * @var_field: The VAR field to create a reference to
2161 * @system: The optional system string
2162 * @event_name: The optional event_name string
2163 *
2164 * Given a variable hist_field, create a VAR_REF hist_field that
2165 * represents a reference to it.
2166 *
2167 * This function also adds the reference to the trigger that
2168 * now references the variable.
2169 *
2170 * Return: The VAR_REF field if successful, NULL if not
2171 */
2172static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2173 struct hist_field *var_field,
067fe038
TZ		 2174 char *system, char *event_name)
2175{
2176 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2177 struct hist_field *ref_field;
8bcebc77
SRV		 2178 int i;
2179
2180 /* Check if the variable already exists */
2181 for (i = 0; i < hist_data->n_var_refs; i++) {
2182 ref_field = hist_data->var_refs[i];
2183 if (ref_field->var.idx == var_field->var.idx &&
2184 ref_field->var.hist_data == var_field->hist_data) {
2185 get_hist_field(ref_field);
2186 return ref_field;
2187 }
2188 }
82470f7d
ZY		 2189 /* Sanity check to avoid out-of-bound write on 'hist_data->var_refs' */
2190 if (hist_data->n_var_refs >= TRACING_MAP_VARS_MAX)
2191 return NULL;
067fe038
TZ		 2192 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2193 if (ref_field) {
2194 if (init_var_ref(ref_field, var_field, system, event_name)) {
2195 destroy_hist_field(ref_field, 0);
2196 return NULL;
2197 }
de40f033
TZ		 2198
2199 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2200 ref_field->var_ref_idx = hist_data->n_var_refs++;
067fe038
TZ		 2201 }
2202
2203 return ref_field;
2204}
2205
2206static bool is_var_ref(char *var_name)
2207{
2208 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2209 return false;
2210
2211 return true;
2212}
2213
2214static char *field_name_from_var(struct hist_trigger_data *hist_data,
2215 char *var_name)
2216{
2217 char *name, *field;
2218 unsigned int i;
2219
2220 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2221 name = hist_data->attrs->var_defs.name[i];
2222
2223 if (strcmp(var_name, name) == 0) {
2224 field = hist_data->attrs->var_defs.expr[i];
9710b2f3 2225 if (contains_operator(field, NULL) || is_var_ref(field))
067fe038
TZ		 2226 continue;
2227 return field;
2228 }
2229 }
2230
2231 return NULL;
2232}
2233
2234static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2235 char *system, char *event_name,
2236 char *var_name)
2237{
2238 struct trace_event_call *call;
2239
2240 if (system && event_name) {
2241 call = hist_data->event_file->event_call;
2242
2243 if (strcmp(system, call->class->system) != 0)
2244 return NULL;
2245
2246 if (strcmp(event_name, trace_event_name(call)) != 0)
2247 return NULL;
2248 }
2249
2250 if (!!system != !!event_name)
2251 return NULL;
2252
2253 if (!is_var_ref(var_name))
2254 return NULL;
2255
2256 var_name++;
2257
2258 return field_name_from_var(hist_data, var_name);
2259}
2260
2261static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2262 char *system, char *event_name,
2263 char *var_name)
2264{
2265 struct hist_field *var_field = NULL, *ref_field = NULL;
d0cd871b 2266 struct trace_array *tr = hist_data->event_file->tr;
067fe038
TZ		 2267
2268 if (!is_var_ref(var_name))
2269 return NULL;
2270
2271 var_name++;
2272
2273 var_field = find_event_var(hist_data, system, event_name, var_name);
2274 if (var_field)
de40f033
TZ		 2275 ref_field = create_var_ref(hist_data, var_field,
2276 system, event_name);
067fe038 2277
f404da6e 2278 if (!ref_field)
d0cd871b 2279 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
f404da6e 2280
067fe038
TZ		 2281 return ref_field;
2282}
2283
100719dc
TZ		 2284static struct ftrace_event_field *
2285parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
de9a48a3 2286 char *field_str, unsigned long *flags, unsigned long *buckets)
100719dc
TZ		 2287{
2288 struct ftrace_event_field *field = NULL;
2289 char *field_name, *modifier, *str;
d0cd871b 2290 struct trace_array *tr = file->tr;
100719dc
TZ		 2291
2292 modifier = str = kstrdup(field_str, GFP_KERNEL);
2293 if (!modifier)
2294 return ERR_PTR(-ENOMEM);
2295
2296 field_name = strsep(&modifier, ".");
2297 if (modifier) {
2298 if (strcmp(modifier, "hex") == 0)
2299 *flags |= HIST_FIELD_FL_HEX;
2300 else if (strcmp(modifier, "sym") == 0)
2301 *flags |= HIST_FIELD_FL_SYM;
c5eac6ee
KS		 2302 /*
2303 * 'sym-offset' occurrences in the trigger string are modified
2304 * to 'symXoffset' to simplify arithmetic expression parsing.
2305 */
2306 else if (strcmp(modifier, "symXoffset") == 0)
100719dc
TZ		 2307 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2308 else if ((strcmp(modifier, "execname") == 0) &&
2309 (strcmp(field_name, "common_pid") == 0))
2310 *flags |= HIST_FIELD_FL_EXECNAME;
2311 else if (strcmp(modifier, "syscall") == 0)
2312 *flags |= HIST_FIELD_FL_SYSCALL;
2313 else if (strcmp(modifier, "log2") == 0)
2314 *flags |= HIST_FIELD_FL_LOG2;
2315 else if (strcmp(modifier, "usecs") == 0)
2316 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
de9a48a3
SRV		 2317 else if (strncmp(modifier, "bucket", 6) == 0) {
2318 int ret;
2319
2320 modifier += 6;
2321
2322 if (*modifier == 's')
2323 modifier++;
2324 if (*modifier != '=')
2325 goto error;
2326 modifier++;
2327 ret = kstrtoul(modifier, 0, buckets);
2328 if (ret || !(*buckets))
2329 goto error;
2330 *flags |= HIST_FIELD_FL_BUCKET;
abaa5258
MHG		 2331 } else if (strncmp(modifier, "percent", 7) == 0) {
2332 if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
2333 goto error;
2334 *flags |= HIST_FIELD_FL_PERCENT;
a2c54256
MHG		 2335 } else if (strncmp(modifier, "graph", 5) == 0) {
2336 if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
2337 goto error;
2338 *flags |= HIST_FIELD_FL_GRAPH;
de9a48a3
SRV		 2339 } else {
2340 error:
d0cd871b 2341 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
100719dc
TZ		 2342 field = ERR_PTR(-EINVAL);
2343 goto out;
2344 }
2345 }
2346
2347 if (strcmp(field_name, "common_timestamp") == 0) {
2348 *flags |= HIST_FIELD_FL_TIMESTAMP;
2349 hist_data->enable_timestamps = true;
2350 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2351 hist_data->attrs->ts_in_usecs = true;
1e3bac71 2352 } else if (strcmp(field_name, "common_cpu") == 0)
8b7622bf 2353 *flags |= HIST_FIELD_FL_CPU;
5f2e094e
TZ		 2354 else if (strcmp(field_name, "hitcount") == 0)
2355 *flags |= HIST_FIELD_FL_HITCOUNT;
8b7622bf 2356 else {
100719dc
TZ		 2357 field = trace_find_event_field(file->event_call, field_name);
2358 if (!field || !field->size) {
1e3bac71
SRV		 2359 /*
2360 * For backward compatibility, if field_name
2361 * was "cpu", then we treat this the same as
1d1898f6 2362 * common_cpu. This also works for "CPU".
1e3bac71 2363 */
1d1898f6 2364 if (field && field->filter_type == FILTER_CPU) {
1e3bac71
SRV		 2365 *flags |= HIST_FIELD_FL_CPU;
2366 } else {
2367 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND,
2368 errpos(field_name));
2369 field = ERR_PTR(-EINVAL);
2370 goto out;
2371 }
100719dc
TZ		 2372 }
2373 }
2374 out:
2375 kfree(str);
2376
2377 return field;
2378}
2379
7e8b88a3
TZ		 2380static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2381 struct hist_field *var_ref,
2382 char *var_name)
2383{
2384 struct hist_field *alias = NULL;
2385 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2386
2387 alias = create_hist_field(hist_data, NULL, flags, var_name);
2388 if (!alias)
2389 return NULL;
2390
86087383 2391 alias->fn_num = var_ref->fn_num;
7e8b88a3
TZ		 2392 alias->operands[0] = var_ref;
2393
2394 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2395 destroy_hist_field(alias, 0);
2396 return NULL;
2397 }
2398
17f8607a
TZ		 2399 alias->var_ref_idx = var_ref->var_ref_idx;
2400
7e8b88a3
TZ		 2401 return alias;
2402}
2403
52cfb373
KS		 2404static struct hist_field *parse_const(struct hist_trigger_data *hist_data,
2405 char *str, char *var_name,
2406 unsigned long *flags)
2407{
2408 struct trace_array *tr = hist_data->event_file->tr;
2409 struct hist_field *field = NULL;
2410 u64 constant;
2411
2412 if (kstrtoull(str, 0, &constant)) {
2413 hist_err(tr, HIST_ERR_EXPECT_NUMBER, errpos(str));
2414 return NULL;
2415 }
2416
2417 *flags |= HIST_FIELD_FL_CONST;
2418 field = create_hist_field(hist_data, NULL, *flags, var_name);
2419 if (!field)
2420 return NULL;
2421
2422 field->constant = constant;
2423
2424 return field;
2425}
2426
100719dc
TZ		 2427static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2428 struct trace_event_file *file, char *str,
2429 unsigned long *flags, char *var_name)
2430{
067fe038 2431 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
100719dc
TZ		 2432 struct ftrace_event_field *field = NULL;
2433 struct hist_field *hist_field = NULL;
de9a48a3 2434 unsigned long buckets = 0;
100719dc
TZ		 2435 int ret = 0;
2436
52cfb373
KS		 2437 if (isdigit(str[0])) {
2438 hist_field = parse_const(hist_data, str, var_name, flags);
2439 if (!hist_field) {
2440 ret = -EINVAL;
2441 goto out;
2442 }
2443 return hist_field;
2444 }
2445
067fe038
TZ		 2446 s = strchr(str, '.');
2447 if (s) {
2448 s = strchr(++s, '.');
2449 if (s) {
2450 ref_system = strsep(&str, ".");
2451 if (!str) {
2452 ret = -EINVAL;
2453 goto out;
2454 }
2455 ref_event = strsep(&str, ".");
2456 if (!str) {
2457 ret = -EINVAL;
2458 goto out;
2459 }
2460 ref_var = str;
2461 }
2462 }
2463
2464 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2465 if (!s) {
d0cd871b
SRV		 2466 hist_field = parse_var_ref(hist_data, ref_system,
2467 ref_event, ref_var);
067fe038 2468 if (hist_field) {
7e8b88a3
TZ		 2469 if (var_name) {
2470 hist_field = create_alias(hist_data, hist_field, var_name);
2471 if (!hist_field) {
2472 ret = -ENOMEM;
2473 goto out;
2474 }
2475 }
067fe038
TZ		 2476 return hist_field;
2477 }
2478 } else
2479 str = s;
2480
de9a48a3 2481 field = parse_field(hist_data, file, str, flags, &buckets);
100719dc
TZ		 2482 if (IS_ERR(field)) {
2483 ret = PTR_ERR(field);
2484 goto out;
2485 }
2486
2487 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2488 if (!hist_field) {
2489 ret = -ENOMEM;
2490 goto out;
2491 }
de9a48a3 2492 hist_field->buckets = buckets;
100719dc
TZ		 2493
2494 return hist_field;
2495 out:
2496 return ERR_PTR(ret);
2497}
2498
2499static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2500 struct trace_event_file *file,
2501 char *str, unsigned long flags,
9710b2f3 2502 char *var_name, unsigned int *n_subexprs);
100719dc
TZ		 2503
2504static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2505 struct trace_event_file *file,
2506 char *str, unsigned long flags,
9710b2f3 2507 char *var_name, unsigned int *n_subexprs)
100719dc
TZ		 2508{
2509 struct hist_field *operand1, *expr = NULL;
2510 unsigned long operand_flags;
2511 int ret = 0;
2512 char *s;
2513
9710b2f3
KS		 2514 /* Unary minus operator, increment n_subexprs */
2515 ++*n_subexprs;
2516
100719dc
TZ		 2517 /* we support only -(xxx) i.e. explicit parens required */
2518
9710b2f3 2519 if (*n_subexprs > 3) {
d0cd871b 2520 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc
TZ		 2521 ret = -EINVAL;
2522 goto free;
2523 }
2524
2525 str++; /* skip leading '-' */
2526
2527 s = strchr(str, '(');
2528 if (s)
2529 str++;
2530 else {
2531 ret = -EINVAL;
2532 goto free;
2533 }
2534
2535 s = strrchr(str, ')');
9710b2f3
KS		 2536 if (s) {
2537 /* unary minus not supported in sub-expressions */
2538 if (*(s+1) != '\0') {
2539 hist_err(file->tr, HIST_ERR_UNARY_MINUS_SUBEXPR,
2540 errpos(str));
2541 ret = -EINVAL;
2542 goto free;
2543 }
100719dc 2544 *s = '\0';
9710b2f3 2545 }
100719dc
TZ		 2546 else {
2547 ret = -EINVAL; /* no closing ')' */
2548 goto free;
2549 }
2550
2551 flags |= HIST_FIELD_FL_EXPR;
2552 expr = create_hist_field(hist_data, NULL, flags, var_name);
2553 if (!expr) {
2554 ret = -ENOMEM;
2555 goto free;
2556 }
2557
2558 operand_flags = 0;
9710b2f3 2559 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs);
100719dc
TZ		 2560 if (IS_ERR(operand1)) {
2561 ret = PTR_ERR(operand1);
2562 goto free;
2563 }
a9d10ca4
MH		 2564 if (operand1->flags & HIST_FIELD_FL_STRING) {
2565 /* String type can not be the operand of unary operator. */
2566 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2567 destroy_hist_field(operand1, 0);
2568 ret = -EINVAL;
2569 goto free;
2570 }
100719dc
TZ		 2571
2572 expr->flags |= operand1->flags &
2573 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
86087383 2574 expr->fn_num = HIST_FIELD_FN_UMINUS;
100719dc 2575 expr->operands[0] = operand1;
097f1eef
TZ		 2576 expr->size = operand1->size;
2577 expr->is_signed = operand1->is_signed;
100719dc
TZ		 2578 expr->operator = FIELD_OP_UNARY_MINUS;
2579 expr->name = expr_str(expr, 0);
3347d80b 2580 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
19a9facd
TZ		 2581 if (!expr->type) {
2582 ret = -ENOMEM;
2583 goto free;
2584 }
100719dc
TZ		 2585
2586 return expr;
2587 free:
2588 destroy_hist_field(expr, 0);
2589 return ERR_PTR(ret);
2590}
2591
f47716b7
KS		 2592/*
2593 * If the operands are var refs, return pointers the
2594 * variable(s) referenced in var1 and var2, else NULL.
2595 */
d0cd871b
SRV		 2596static int check_expr_operands(struct trace_array *tr,
2597 struct hist_field *operand1,
f47716b7
KS		 2598 struct hist_field *operand2,
2599 struct hist_field **var1,
2600 struct hist_field **var2)
100719dc
TZ		 2601{
2602 unsigned long operand1_flags = operand1->flags;
2603 unsigned long operand2_flags = operand2->flags;
2604
7e8b88a3
TZ		 2605 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2606 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2607 struct hist_field *var;
2608
2609 var = find_var_field(operand1->var.hist_data, operand1->name);
2610 if (!var)
2611 return -EINVAL;
2612 operand1_flags = var->flags;
f47716b7 2613 *var1 = var;
7e8b88a3
TZ		 2614 }
2615
2616 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2617 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2618 struct hist_field *var;
2619
2620 var = find_var_field(operand2->var.hist_data, operand2->name);
2621 if (!var)
2622 return -EINVAL;
2623 operand2_flags = var->flags;
f47716b7 2624 *var2 = var;
7e8b88a3
TZ		 2625 }
2626
100719dc 2627 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
f404da6e 2628 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
d0cd871b 2629 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
100719dc 2630 return -EINVAL;
f404da6e 2631 }
100719dc
TZ		 2632
2633 return 0;
2634}
2635
2636static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2637 struct trace_event_file *file,
2638 char *str, unsigned long flags,
9710b2f3 2639 char *var_name, unsigned int *n_subexprs)
100719dc
TZ		 2640{
2641 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
f47716b7
KS		 2642 struct hist_field *var1 = NULL, *var2 = NULL;
2643 unsigned long operand_flags, operand2_flags;
100719dc
TZ		 2644 int field_op, ret = -EINVAL;
2645 char *sep, *operand1_str;
86087383 2646 enum hist_field_fn op_fn;
f47716b7 2647 bool combine_consts;
100719dc 2648
9710b2f3 2649 if (*n_subexprs > 3) {
d0cd871b 2650 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
100719dc 2651 return ERR_PTR(-EINVAL);
f404da6e 2652 }
100719dc 2653
9710b2f3 2654 field_op = contains_operator(str, &sep);
100719dc
TZ		 2655
2656 if (field_op == FIELD_OP_NONE)
2657 return parse_atom(hist_data, file, str, &flags, var_name);
2658
2659 if (field_op == FIELD_OP_UNARY_MINUS)
9710b2f3 2660 return parse_unary(hist_data, file, str, flags, var_name, n_subexprs);
100719dc 2661
9710b2f3
KS		 2662 /* Binary operator found, increment n_subexprs */
2663 ++*n_subexprs;
100719dc 2664
9710b2f3
KS		 2665 /* Split the expression string at the root operator */
2666 if (!sep)
f86b0aaa
KS		 2667 return ERR_PTR(-EINVAL);
2668
9710b2f3
KS		 2669 *sep = '\0';
2670 operand1_str = str;
2671 str = sep+1;
100719dc 2672
1cab6bce
KS		 2673 /* Binary operator requires both operands */
2674 if (*operand1_str == '\0' || *str == '\0')
f86b0aaa 2675 return ERR_PTR(-EINVAL);
100719dc
TZ		 2676
2677 operand_flags = 0;
9710b2f3
KS		 2678
2679 /* LHS of string is an expression e.g. a+b in a+b+c */
2680 operand1 = parse_expr(hist_data, file, operand1_str, operand_flags, NULL, n_subexprs);
f86b0aaa
KS		 2681 if (IS_ERR(operand1))
2682 return ERR_CAST(operand1);
2683
a9d10ca4
MH		 2684 if (operand1->flags & HIST_FIELD_FL_STRING) {
2685 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str));
2686 ret = -EINVAL;
f86b0aaa 2687 goto free_op1;
a9d10ca4 2688 }
100719dc 2689
9710b2f3 2690 /* RHS of string is another expression e.g. c in a+b+c */
100719dc 2691 operand_flags = 0;
9710b2f3 2692 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs);
100719dc
TZ		 2693 if (IS_ERR(operand2)) {
2694 ret = PTR_ERR(operand2);
f86b0aaa 2695 goto free_op1;
100719dc 2696 }
a9d10ca4
MH		 2697 if (operand2->flags & HIST_FIELD_FL_STRING) {
2698 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2699 ret = -EINVAL;
f86b0aaa 2700 goto free_operands;
a9d10ca4 2701 }
100719dc 2702
f47716b7
KS		 2703 switch (field_op) {
2704 case FIELD_OP_MINUS:
86087383 2705 op_fn = HIST_FIELD_FN_MINUS;
f47716b7
KS		 2706 break;
2707 case FIELD_OP_PLUS:
86087383 2708 op_fn = HIST_FIELD_FN_PLUS;
f47716b7
KS		 2709 break;
2710 case FIELD_OP_DIV:
86087383 2711 op_fn = HIST_FIELD_FN_DIV;
f47716b7
KS		 2712 break;
2713 case FIELD_OP_MULT:
86087383 2714 op_fn = HIST_FIELD_FN_MULT;
f47716b7
KS		 2715 break;
2716 default:
2717 ret = -EINVAL;
f86b0aaa 2718 goto free_operands;
f47716b7
KS		 2719 }
2720
2721 ret = check_expr_operands(file->tr, operand1, operand2, &var1, &var2);
100719dc 2722 if (ret)
f86b0aaa 2723 goto free_operands;
100719dc 2724
f47716b7
KS		 2725 operand_flags = var1 ? var1->flags : operand1->flags;
2726 operand2_flags = var2 ? var2->flags : operand2->flags;
2727
2728 /*
2729 * If both operands are constant, the expression can be
2730 * collapsed to a single constant.
2731 */
2732 combine_consts = operand_flags & operand2_flags & HIST_FIELD_FL_CONST;
2733
2734 flags |= combine_consts ? HIST_FIELD_FL_CONST : HIST_FIELD_FL_EXPR;
100719dc
TZ		 2735
2736 flags |= operand1->flags &
2737 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2738
2739 expr = create_hist_field(hist_data, NULL, flags, var_name);
2740 if (!expr) {
2741 ret = -ENOMEM;
f86b0aaa 2742 goto free_operands;
100719dc
TZ		 2743 }
2744
067fe038
TZ		 2745 operand1->read_once = true;
2746 operand2->read_once = true;
2747
f86b0aaa 2748 /* The operands are now owned and free'd by 'expr' */
100719dc
TZ		 2749 expr->operands[0] = operand1;
2750 expr->operands[1] = operand2;
2c05caa7 2751
8b5d46fd
KS		 2752 if (field_op == FIELD_OP_DIV &&
2753 operand2_flags & HIST_FIELD_FL_CONST) {
2754 u64 divisor = var2 ? var2->constant : operand2->constant;
2755
2756 if (!divisor) {
2757 hist_err(file->tr, HIST_ERR_DIVISION_BY_ZERO, errpos(str));
2758 ret = -EDOM;
f86b0aaa 2759 goto free_expr;
8b5d46fd
KS		 2760 }
2761
2762 /*
2763 * Copy the divisor here so we don't have to look it up
2764 * later if this is a var ref
2765 */
2766 operand2->constant = divisor;
2767 op_fn = hist_field_get_div_fn(operand2);
2768 }
2769
86087383
SRG		 2770 expr->fn_num = op_fn;
2771
f47716b7
KS		 2772 if (combine_consts) {
2773 if (var1)
2774 expr->operands[0] = var1;
2775 if (var2)
2776 expr->operands[1] = var2;
2c05caa7 2777
86087383
SRG		 2778 expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL);
2779 expr->fn_num = HIST_FIELD_FN_CONST;
100719dc 2780
f47716b7
KS		 2781 expr->operands[0] = NULL;
2782 expr->operands[1] = NULL;
2783
2784 /*
2785 * var refs won't be destroyed immediately
2786 * See: destroy_hist_field()
2787 */
2788 destroy_hist_field(operand2, 0);
2789 destroy_hist_field(operand1, 0);
2790
2791 expr->name = expr_str(expr, 0);
2792 } else {
f47716b7
KS		 2793 /* The operand sizes should be the same, so just pick one */
2794 expr->size = operand1->size;
097f1eef 2795 expr->is_signed = operand1->is_signed;
f47716b7
KS		 2796
2797 expr->operator = field_op;
2798 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
2799 if (!expr->type) {
2800 ret = -ENOMEM;
f86b0aaa 2801 goto free_expr;
f47716b7
KS		 2802 }
2803
2804 expr->name = expr_str(expr, 0);
100719dc
TZ		 2805 }
2806
2807 return expr;
f86b0aaa
KS		 2808
2809free_operands:
100719dc 2810 destroy_hist_field(operand2, 0);
f86b0aaa
KS		 2811free_op1:
2812 destroy_hist_field(operand1, 0);
2813 return ERR_PTR(ret);
100719dc 2814
f86b0aaa
KS		 2815free_expr:
2816 destroy_hist_field(expr, 0);
100719dc
TZ		 2817 return ERR_PTR(ret);
2818}
2819
02205a67
TZ		 2820static char *find_trigger_filter(struct hist_trigger_data *hist_data,
2821 struct trace_event_file *file)
2822{
2823 struct event_trigger_data *test;
2824
aeed8aa3
MH		 2825 lockdep_assert_held(&event_mutex);
2826
2827 list_for_each_entry(test, &file->triggers, list) {
02205a67
TZ		 2828 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2829 if (test->private_data == hist_data)
2830 return test->filter_str;
2831 }
2832 }
2833
2834 return NULL;
2835}
2836
2837static struct event_command trigger_hist_cmd;
9ec5a7d1
TZ		 2838static int event_hist_trigger_parse(struct event_command *cmd_ops,
2839 struct trace_event_file *file,
e1f187d0
TZ		 2840 char *glob, char *cmd,
2841 char *param_and_filter);
02205a67
TZ		 2842
2843static bool compatible_keys(struct hist_trigger_data *target_hist_data,
2844 struct hist_trigger_data *hist_data,
2845 unsigned int n_keys)
2846{
2847 struct hist_field *target_hist_field, *hist_field;
2848 unsigned int n, i, j;
2849
2850 if (hist_data->n_fields - hist_data->n_vals != n_keys)
2851 return false;
2852
2853 i = hist_data->n_vals;
2854 j = target_hist_data->n_vals;
2855
2856 for (n = 0; n < n_keys; n++) {
2857 hist_field = hist_data->fields[i + n];
2858 target_hist_field = target_hist_data->fields[j + n];
2859
2860 if (strcmp(hist_field->type, target_hist_field->type) != 0)
2861 return false;
2862 if (hist_field->size != target_hist_field->size)
2863 return false;
2864 if (hist_field->is_signed != target_hist_field->is_signed)
2865 return false;
2866 }
2867
2868 return true;
2869}
2870
2871static struct hist_trigger_data *
2872find_compatible_hist(struct hist_trigger_data *target_hist_data,
2873 struct trace_event_file *file)
2874{
2875 struct hist_trigger_data *hist_data;
2876 struct event_trigger_data *test;
2877 unsigned int n_keys;
2878
aeed8aa3
MH		 2879 lockdep_assert_held(&event_mutex);
2880
02205a67
TZ		 2881 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
2882
aeed8aa3 2883 list_for_each_entry(test, &file->triggers, list) {
02205a67
TZ		 2884 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2885 hist_data = test->private_data;
2886
2887 if (compatible_keys(target_hist_data, hist_data, n_keys))
2888 return hist_data;
2889 }
2890 }
2891
2892 return NULL;
2893}
2894
2895static struct trace_event_file *event_file(struct trace_array *tr,
2896 char *system, char *event_name)
2897{
2898 struct trace_event_file *file;
2899
3be4c1e5 2900 file = __find_event_file(tr, system, event_name);
02205a67
TZ		 2901 if (!file)
2902 return ERR_PTR(-EINVAL);
2903
2904 return file;
2905}
2906
2907static struct hist_field *
2908find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
2909 char *system, char *event_name, char *field_name)
2910{
2911 struct hist_field *event_var;
2912 char *synthetic_name;
2913
2914 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2915 if (!synthetic_name)
2916 return ERR_PTR(-ENOMEM);
2917
2918 strcpy(synthetic_name, "synthetic_");
2919 strcat(synthetic_name, field_name);
2920
2921 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
2922
2923 kfree(synthetic_name);
2924
2925 return event_var;
2926}
2927
2928/**
2929 * create_field_var_hist - Automatically create a histogram and var for a field
2930 * @target_hist_data: The target hist trigger
2931 * @subsys_name: Optional subsystem name
2932 * @event_name: Optional event name
2933 * @field_name: The name of the field (and the resulting variable)
2934 *
2935 * Hist trigger actions fetch data from variables, not directly from
2936 * events. However, for convenience, users are allowed to directly
2937 * specify an event field in an action, which will be automatically
2938 * converted into a variable on their behalf.
b26503b1 2939 *
02205a67
TZ		 2940 * If a user specifies a field on an event that isn't the event the
2941 * histogram currently being defined (the target event histogram), the
2942 * only way that can be accomplished is if a new hist trigger is
2943 * created and the field variable defined on that.
2944 *
2945 * This function creates a new histogram compatible with the target
2946 * event (meaning a histogram with the same key as the target
2947 * histogram), and creates a variable for the specified field, but
2948 * with 'synthetic_' prepended to the variable name in order to avoid
2949 * collision with normal field variables.
2950 *
2951 * Return: The variable created for the field.
2952 */
c282a386 2953static struct hist_field *
02205a67
TZ		 2954create_field_var_hist(struct hist_trigger_data *target_hist_data,
2955 char *subsys_name, char *event_name, char *field_name)
2956{
2957 struct trace_array *tr = target_hist_data->event_file->tr;
02205a67
TZ		 2958 struct hist_trigger_data *hist_data;
2959 unsigned int i, n, first = true;
2960 struct field_var_hist *var_hist;
2961 struct trace_event_file *file;
2962 struct hist_field *key_field;
614db49c 2963 struct hist_field *event_var;
02205a67
TZ		 2964 char *saved_filter;
2965 char *cmd;
2966 int ret;
2967
f404da6e 2968 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
d0cd871b 2969 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67 2970 return ERR_PTR(-EINVAL);
f404da6e 2971 }
02205a67
TZ		 2972
2973 file = event_file(tr, subsys_name, event_name);
2974
2975 if (IS_ERR(file)) {
d0cd871b 2976 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
02205a67
TZ		 2977 ret = PTR_ERR(file);
2978 return ERR_PTR(ret);
2979 }
2980
2981 /*
2982 * Look for a histogram compatible with target. We'll use the
2983 * found histogram specification to create a new matching
2984 * histogram with our variable on it. target_hist_data is not
2985 * yet a registered histogram so we can't use that.
2986 */
2987 hist_data = find_compatible_hist(target_hist_data, file);
f404da6e 2988 if (!hist_data) {
d0cd871b 2989 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
02205a67 2990 return ERR_PTR(-EINVAL);
f404da6e 2991 }
02205a67
TZ		 2992
2993 /* See if a synthetic field variable has already been created */
2994 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2995 event_name, field_name);
2996 if (!IS_ERR_OR_NULL(event_var))
2997 return event_var;
2998
2999 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3000 if (!var_hist)
3001 return ERR_PTR(-ENOMEM);
3002
3003 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3004 if (!cmd) {
3005 kfree(var_hist);
3006 return ERR_PTR(-ENOMEM);
3007 }
3008
3009 /* Use the same keys as the compatible histogram */
3010 strcat(cmd, "keys=");
3011
3012 for_each_hist_key_field(i, hist_data) {
3013 key_field = hist_data->fields[i];
3014 if (!first)
3015 strcat(cmd, ",");
3016 strcat(cmd, key_field->field->name);
3017 first = false;
3018 }
3019
3020 /* Create the synthetic field variable specification */
3021 strcat(cmd, ":synthetic_");
3022 strcat(cmd, field_name);
3023 strcat(cmd, "=");
3024 strcat(cmd, field_name);
3025
3026 /* Use the same filter as the compatible histogram */
3027 saved_filter = find_trigger_filter(hist_data, file);
3028 if (saved_filter) {
3029 strcat(cmd, " if ");
3030 strcat(cmd, saved_filter);
3031 }
3032
3033 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3034 if (!var_hist->cmd) {
3035 kfree(cmd);
3036 kfree(var_hist);
3037 return ERR_PTR(-ENOMEM);
3038 }
3039
3040 /* Save the compatible histogram information */
3041 var_hist->hist_data = hist_data;
3042
3043 /* Create the new histogram with our variable */
9ec5a7d1
TZ		 3044 ret = event_hist_trigger_parse(&trigger_hist_cmd, file,
3045 "", "hist", cmd);
02205a67
TZ		 3046 if (ret) {
3047 kfree(cmd);
3048 kfree(var_hist->cmd);
3049 kfree(var_hist);
d0cd871b 3050 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
02205a67
TZ		 3051 return ERR_PTR(ret);
3052 }
3053
3054 kfree(cmd);
3055
3056 /* If we can't find the variable, something went wrong */
3057 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3058 event_name, field_name);
3059 if (IS_ERR_OR_NULL(event_var)) {
3060 kfree(var_hist->cmd);
3061 kfree(var_hist);
d0cd871b 3062 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
02205a67
TZ		 3063 return ERR_PTR(-EINVAL);
3064 }
3065
3066 n = target_hist_data->n_field_var_hists;
3067 target_hist_data->field_var_hists[n] = var_hist;
3068 target_hist_data->n_field_var_hists++;
3069
3070 return event_var;
3071}
3072
c282a386 3073static struct hist_field *
02205a67
TZ		 3074find_target_event_var(struct hist_trigger_data *hist_data,
3075 char *subsys_name, char *event_name, char *var_name)
3076{
3077 struct trace_event_file *file = hist_data->event_file;
3078 struct hist_field *hist_field = NULL;
3079
3080 if (subsys_name) {
3081 struct trace_event_call *call;
3082
3083 if (!event_name)
3084 return NULL;
3085
3086 call = file->event_call;
3087
3088 if (strcmp(subsys_name, call->class->system) != 0)
3089 return NULL;
3090
3091 if (strcmp(event_name, trace_event_name(call)) != 0)
3092 return NULL;
3093 }
3094
3095 hist_field = find_var_field(hist_data, var_name);
3096
3097 return hist_field;
3098}
3099
3100static inline void __update_field_vars(struct tracing_map_elt *elt,
b47e3302 3101 struct trace_buffer *buffer,
02205a67
TZ		 3102 struct ring_buffer_event *rbe,
3103 void *rec,
3104 struct field_var **field_vars,
3105 unsigned int n_field_vars,
3106 unsigned int field_var_str_start)
3107{
3108 struct hist_elt_data *elt_data = elt->private_data;
3109 unsigned int i, j, var_idx;
3110 u64 var_val;
3111
3112 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3113 struct field_var *field_var = field_vars[i];
3114 struct hist_field *var = field_var->var;
3115 struct hist_field *val = field_var->val;
3116
86087383 3117 var_val = hist_fn_call(val, elt, buffer, rbe, rec);
02205a67
TZ		 3118 var_idx = var->var.idx;
3119
3120 if (val->flags & HIST_FIELD_FL_STRING) {
3121 char *str = elt_data->field_var_str[j++];
3122 char *val_str = (char *)(uintptr_t)var_val;
938aa33f 3123 unsigned int size;
02205a67 3124
938aa33f
SRV		 3125 size = min(val->size, STR_VAR_LEN_MAX);
3126 strscpy(str, val_str, size);
02205a67
TZ		 3127 var_val = (u64)(uintptr_t)str;
3128 }
3129 tracing_map_set_var(elt, var_idx, var_val);
3130 }
3131}
3132
3133static void update_field_vars(struct hist_trigger_data *hist_data,
3134 struct tracing_map_elt *elt,
b47e3302 3135 struct trace_buffer *buffer,
02205a67
TZ		 3136 struct ring_buffer_event *rbe,
3137 void *rec)
3138{
b47e3302 3139 __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars,
02205a67
TZ		 3140 hist_data->n_field_vars, 0);
3141}
3142
466f4528 3143static void save_track_data_vars(struct hist_trigger_data *hist_data,
b47e3302
SRV		 3144 struct tracing_map_elt *elt,
3145 struct trace_buffer *buffer, void *rec,
466f4528
TZ		 3146 struct ring_buffer_event *rbe, void *key,
3147 struct action_data *data, u64 *var_ref_vals)
50450603 3148{
b47e3302 3149 __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars,
7d18a10c 3150 hist_data->n_save_vars, hist_data->n_field_var_str);
50450603
TZ		 3151}
3152
02205a67
TZ		 3153static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3154 struct trace_event_file *file,
3155 char *name, int size, const char *type)
3156{
3157 struct hist_field *var;
3158 int idx;
3159
3160 if (find_var(hist_data, file, name) && !hist_data->remove) {
3161 var = ERR_PTR(-EINVAL);
3162 goto out;
3163 }
3164
3165 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3166 if (!var) {
3167 var = ERR_PTR(-ENOMEM);
3168 goto out;
3169 }
3170
3171 idx = tracing_map_add_var(hist_data->map);
3172 if (idx < 0) {
3173 kfree(var);
3174 var = ERR_PTR(-EINVAL);
3175 goto out;
3176 }
3177
9da73974 3178 var->ref = 1;
02205a67
TZ		 3179 var->flags = HIST_FIELD_FL_VAR;
3180 var->var.idx = idx;
3181 var->var.hist_data = var->hist_data = hist_data;
3182 var->size = size;
3183 var->var.name = kstrdup(name, GFP_KERNEL);
3347d80b 3184 var->type = kstrdup_const(type, GFP_KERNEL);
02205a67 3185 if (!var->var.name || !var->type) {
3347d80b 3186 kfree_const(var->type);
02205a67 3187 kfree(var->var.name);
02205a67
TZ		 3188 kfree(var);
3189 var = ERR_PTR(-ENOMEM);
3190 }
3191 out:
3192 return var;
3193}
3194
3195static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3196 struct trace_event_file *file,
3197 char *field_name)
3198{
3199 struct hist_field *val = NULL, *var = NULL;
3200 unsigned long flags = HIST_FIELD_FL_VAR;
d0cd871b 3201 struct trace_array *tr = file->tr;
02205a67
TZ		 3202 struct field_var *field_var;
3203 int ret = 0;
3204
3205 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
d0cd871b 3206 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
02205a67
TZ		 3207 ret = -EINVAL;
3208 goto err;
3209 }
3210
3211 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3212 if (IS_ERR(val)) {
d0cd871b 3213 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
02205a67
TZ		 3214 ret = PTR_ERR(val);
3215 goto err;
3216 }
3217
3218 var = create_var(hist_data, file, field_name, val->size, val->type);
3219 if (IS_ERR(var)) {
d0cd871b 3220 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
02205a67
TZ		 3221 kfree(val);
3222 ret = PTR_ERR(var);
3223 goto err;
3224 }
3225
3226 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3227 if (!field_var) {
3228 kfree(val);
3229 kfree(var);
3230 ret = -ENOMEM;
3231 goto err;
3232 }
3233
3234 field_var->var = var;
3235 field_var->val = val;
3236 out:
3237 return field_var;
3238 err:
3239 field_var = ERR_PTR(ret);
3240 goto out;
3241}
3242
3243/**
3244 * create_target_field_var - Automatically create a variable for a field
3245 * @target_hist_data: The target hist trigger
3246 * @subsys_name: Optional subsystem name
3247 * @event_name: Optional event name
3248 * @var_name: The name of the field (and the resulting variable)
3249 *
3250 * Hist trigger actions fetch data from variables, not directly from
3251 * events. However, for convenience, users are allowed to directly
3252 * specify an event field in an action, which will be automatically
3253 * converted into a variable on their behalf.
0a068f4a 3254 *
02205a67
TZ		 3255 * This function creates a field variable with the name var_name on
3256 * the hist trigger currently being defined on the target event. If
3257 * subsys_name and event_name are specified, this function simply
3258 * verifies that they do in fact match the target event subsystem and
3259 * event name.
3260 *
3261 * Return: The variable created for the field.
3262 */
c282a386 3263static struct field_var *
02205a67
TZ		 3264create_target_field_var(struct hist_trigger_data *target_hist_data,
3265 char *subsys_name, char *event_name, char *var_name)
3266{
3267 struct trace_event_file *file = target_hist_data->event_file;
3268
3269 if (subsys_name) {
3270 struct trace_event_call *call;
3271
3272 if (!event_name)
3273 return NULL;
3274
3275 call = file->event_call;
3276
3277 if (strcmp(subsys_name, call->class->system) != 0)
3278 return NULL;
3279
3280 if (strcmp(event_name, trace_event_name(call)) != 0)
3281 return NULL;
3282 }
3283
3284 return create_field_var(target_hist_data, file, var_name);
3285}
3286
466f4528
TZ		 3287static bool check_track_val_max(u64 track_val, u64 var_val)
3288{
3289 if (var_val <= track_val)
3290 return false;
3291
3292 return true;
3293}
3294
dff81f55
TZ		 3295static bool check_track_val_changed(u64 track_val, u64 var_val)
3296{
3297 if (var_val == track_val)
3298 return false;
3299
3300 return true;
3301}
3302
466f4528
TZ		 3303static u64 get_track_val(struct hist_trigger_data *hist_data,
3304 struct tracing_map_elt *elt,
3305 struct action_data *data)
50450603 3306{
466f4528
TZ		 3307 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3308 u64 track_val;
3309
3310 track_val = tracing_map_read_var(elt, track_var_idx);
50450603 3311
466f4528
TZ		 3312 return track_val;
3313}
3314
3315static void save_track_val(struct hist_trigger_data *hist_data,
3316 struct tracing_map_elt *elt,
3317 struct action_data *data, u64 var_val)
3318{
3319 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3320
3321 tracing_map_set_var(elt, track_var_idx, var_val);
3322}
3323
3324static void save_track_data(struct hist_trigger_data *hist_data,
b47e3302
SRV		 3325 struct tracing_map_elt *elt,
3326 struct trace_buffer *buffer, void *rec,
466f4528
TZ		 3327 struct ring_buffer_event *rbe, void *key,
3328 struct action_data *data, u64 *var_ref_vals)
3329{
3330 if (data->track_data.save_data)
b47e3302
SRV		 3331 data->track_data.save_data(hist_data, elt, buffer, rec, rbe,
3332 key, data, var_ref_vals);
466f4528
TZ		 3333}
3334
3335static bool check_track_val(struct tracing_map_elt *elt,
3336 struct action_data *data,
3337 u64 var_val)
3338{
3339 struct hist_trigger_data *hist_data;
3340 u64 track_val;
3341
3342 hist_data = data->track_data.track_var->hist_data;
3343 track_val = get_track_val(hist_data, elt, data);
3344
3345 return data->track_data.check_val(track_val, var_val);
3346}
3347
a3785b7e
TZ		 3348#ifdef CONFIG_TRACER_SNAPSHOT
3349static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3350{
3351 /* called with tr->max_lock held */
3352 struct track_data *track_data = tr->cond_snapshot->cond_data;
3353 struct hist_elt_data *elt_data, *track_elt_data;
3354 struct snapshot_context *context = cond_data;
9b2ca371 3355 struct action_data *action;
a3785b7e
TZ		 3356 u64 track_val;
3357
3358 if (!track_data)
3359 return false;
3360
9b2ca371
TZ		 3361 action = track_data->action_data;
3362
a3785b7e
TZ		 3363 track_val = get_track_val(track_data->hist_data, context->elt,
3364 track_data->action_data);
3365
9b2ca371
TZ		 3366 if (!action->track_data.check_val(track_data->track_val, track_val))
3367 return false;
3368
a3785b7e
TZ		 3369 track_data->track_val = track_val;
3370 memcpy(track_data->key, context->key, track_data->key_len);
3371
3372 elt_data = context->elt->private_data;
3373 track_elt_data = track_data->elt.private_data;
3374 if (elt_data->comm)
27242c62 3375 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
a3785b7e
TZ		 3376
3377 track_data->updated = true;
3378
3379 return true;
3380}
3381
3382static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
b47e3302
SRV		 3383 struct tracing_map_elt *elt,
3384 struct trace_buffer *buffer, void *rec,
a3785b7e
TZ		 3385 struct ring_buffer_event *rbe, void *key,
3386 struct action_data *data,
3387 u64 *var_ref_vals)
3388{
3389 struct trace_event_file *file = hist_data->event_file;
3390 struct snapshot_context context;
3391
3392 context.elt = elt;
3393 context.key = key;
3394
3395 tracing_snapshot_cond(file->tr, &context);
3396}
3397
3398static void hist_trigger_print_key(struct seq_file *m,
3399 struct hist_trigger_data *hist_data,
3400 void *key,
3401 struct tracing_map_elt *elt);
3402
3403static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3404{
3405 unsigned int i;
3406
3407 if (!hist_data->n_actions)
3408 return NULL;
3409
3410 for (i = 0; i < hist_data->n_actions; i++) {
3411 struct action_data *data = hist_data->actions[i];
3412
3413 if (data->action == ACTION_SNAPSHOT)
3414 return data;
3415 }
3416
3417 return NULL;
3418}
3419
3420static void track_data_snapshot_print(struct seq_file *m,
3421 struct hist_trigger_data *hist_data)
3422{
3423 struct trace_event_file *file = hist_data->event_file;
3424 struct track_data *track_data;
3425 struct action_data *action;
3426
3427 track_data = tracing_cond_snapshot_data(file->tr);
3428 if (!track_data)
3429 return;
3430
3431 if (!track_data->updated)
3432 return;
3433
3434 action = snapshot_action(hist_data);
3435 if (!action)
3436 return;
3437
3438 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3439 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3440 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3441 action->track_data.var_str, track_data->track_val);
3442
3443 seq_puts(m, "\ttriggered by event with key: ");
3444 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3445 seq_putc(m, '\n');
3446}
3447#else
3448static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3449{
3450 return false;
3451}
3452static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
b47e3302
SRV		 3453 struct tracing_map_elt *elt,
3454 struct trace_buffer *buffer, void *rec,
a3785b7e
TZ		 3455 struct ring_buffer_event *rbe, void *key,
3456 struct action_data *data,
3457 u64 *var_ref_vals) {}
3458static void track_data_snapshot_print(struct seq_file *m,
3459 struct hist_trigger_data *hist_data) {}
3460#endif /* CONFIG_TRACER_SNAPSHOT */
3461
466f4528
TZ		 3462static void track_data_print(struct seq_file *m,
3463 struct hist_trigger_data *hist_data,
3464 struct tracing_map_elt *elt,
3465 struct action_data *data)
3466{
3467 u64 track_val = get_track_val(hist_data, elt, data);
3468 unsigned int i, save_var_idx;
3469
3470 if (data->handler == HANDLER_ONMAX)
3471 seq_printf(m, "\n\tmax: %10llu", track_val);
dff81f55
TZ		 3472 else if (data->handler == HANDLER_ONCHANGE)
3473 seq_printf(m, "\n\tchanged: %10llu", track_val);
50450603 3474
a3785b7e
TZ		 3475 if (data->action == ACTION_SNAPSHOT)
3476 return;
3477
7d18a10c
TZ		 3478 for (i = 0; i < hist_data->n_save_vars; i++) {
3479 struct hist_field *save_val = hist_data->save_vars[i]->val;
3480 struct hist_field *save_var = hist_data->save_vars[i]->var;
50450603
TZ		 3481 u64 val;
3482
3483 save_var_idx = save_var->var.idx;
3484
3485 val = tracing_map_read_var(elt, save_var_idx);
3486
3487 if (save_val->flags & HIST_FIELD_FL_STRING) {
3488 seq_printf(m, " %s: %-32s", save_var->var.name,
3489 (char *)(uintptr_t)(val));
3490 } else
3491 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3492 }
3493}
3494
466f4528 3495static void ontrack_action(struct hist_trigger_data *hist_data,
b47e3302
SRV		 3496 struct tracing_map_elt *elt,
3497 struct trace_buffer *buffer, void *rec,
466f4528
TZ		 3498 struct ring_buffer_event *rbe, void *key,
3499 struct action_data *data, u64 *var_ref_vals)
50450603 3500{
466f4528 3501 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
50450603 3502
466f4528
TZ		 3503 if (check_track_val(elt, data, var_val)) {
3504 save_track_val(hist_data, elt, data, var_val);
b47e3302
SRV		 3505 save_track_data(hist_data, elt, buffer, rec, rbe,
3506 key, data, var_ref_vals);
466f4528 3507 }
50450603
TZ		 3508}
3509
c3e49506 3510static void action_data_destroy(struct action_data *data)
50450603
TZ		 3511{
3512 unsigned int i;
3513
c3e49506 3514 lockdep_assert_held(&event_mutex);
50450603 3515
7d18a10c 3516 kfree(data->action_name);
50450603
TZ		 3517
3518 for (i = 0; i < data->n_params; i++)
3519 kfree(data->params[i]);
3520
c3e49506
TZ		 3521 if (data->synth_event)
3522 data->synth_event->ref--;
3523
e91eefd7
TZ		 3524 kfree(data->synth_event_name);
3525
50450603
TZ		 3526 kfree(data);
3527}
3528
466f4528
TZ		 3529static void track_data_destroy(struct hist_trigger_data *hist_data,
3530 struct action_data *data)
c3e49506 3531{
a3785b7e
TZ		 3532 struct trace_event_file *file = hist_data->event_file;
3533
466f4528 3534 destroy_hist_field(data->track_data.track_var, 0);
c3e49506 3535
a3785b7e
TZ		 3536 if (data->action == ACTION_SNAPSHOT) {
3537 struct track_data *track_data;
3538
3539 track_data = tracing_cond_snapshot_data(file->tr);
3540 if (track_data && track_data->hist_data == hist_data) {
3541 tracing_snapshot_cond_disable(file->tr);
3542 track_data_free(track_data);
3543 }
3544 }
3545
466f4528 3546 kfree(data->track_data.var_str);
c3e49506
TZ		 3547
3548 action_data_destroy(data);
3549}
3550
7d18a10c
TZ		 3551static int action_create(struct hist_trigger_data *hist_data,
3552 struct action_data *data);
3553
466f4528
TZ		 3554static int track_data_create(struct hist_trigger_data *hist_data,
3555 struct action_data *data)
50450603 3556{
466f4528 3557 struct hist_field *var_field, *ref_field, *track_var = NULL;
50450603 3558 struct trace_event_file *file = hist_data->event_file;
d0cd871b 3559 struct trace_array *tr = file->tr;
466f4528 3560 char *track_data_var_str;
50450603
TZ		 3561 int ret = 0;
3562
466f4528
TZ		 3563 track_data_var_str = data->track_data.var_str;
3564 if (track_data_var_str[0] != '$') {
d0cd871b 3565 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
50450603 3566 return -EINVAL;
f404da6e 3567 }
466f4528 3568 track_data_var_str++;
50450603 3569
466f4528 3570 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
f404da6e 3571 if (!var_field) {
d0cd871b 3572 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
50450603 3573 return -EINVAL;
f404da6e 3574 }
50450603 3575
de40f033 3576 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
50450603
TZ		 3577 if (!ref_field)
3578 return -ENOMEM;
3579
466f4528 3580 data->track_data.var_ref = ref_field;
50450603 3581
466f4528
TZ		 3582 if (data->handler == HANDLER_ONMAX)
3583 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3584 if (IS_ERR(track_var)) {
d0cd871b 3585 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
466f4528 3586 ret = PTR_ERR(track_var);
50450603
TZ		 3587 goto out;
3588 }
dff81f55
TZ		 3589
3590 if (data->handler == HANDLER_ONCHANGE)
3591 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3592 if (IS_ERR(track_var)) {
d0cd871b 3593 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
dff81f55
TZ		 3594 ret = PTR_ERR(track_var);
3595 goto out;
3596 }
466f4528 3597 data->track_data.track_var = track_var;
50450603 3598
7d18a10c 3599 ret = action_create(hist_data, data);
50450603
TZ		 3600 out:
3601 return ret;
3602}
3603
d0cd871b
SRV		 3604static int parse_action_params(struct trace_array *tr, char *params,
3605 struct action_data *data)
50450603
TZ		 3606{
3607 char *param, *saved_param;
e91eefd7 3608 bool first_param = true;
50450603
TZ		 3609 int ret = 0;
3610
3611 while (params) {
7d18a10c 3612 if (data->n_params >= SYNTH_FIELDS_MAX) {
d0cd871b 3613 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
2cc6a528 3614 ret = -EINVAL;
50450603 3615 goto out;
7d18a10c 3616 }
50450603
TZ		 3617
3618 param = strsep(&params, ",");
3619 if (!param) {
d0cd871b 3620 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
50450603
TZ		 3621 ret = -EINVAL;
3622 goto out;
3623 }
3624
3625 param = strstrip(param);
3626 if (strlen(param) < 2) {
d0cd871b 3627 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
50450603
TZ		 3628 ret = -EINVAL;
3629 goto out;
3630 }
3631
3632 saved_param = kstrdup(param, GFP_KERNEL);
3633 if (!saved_param) {
3634 ret = -ENOMEM;
3635 goto out;
3636 }
3637
e91eefd7
TZ		 3638 if (first_param && data->use_trace_keyword) {
3639 data->synth_event_name = saved_param;
3640 first_param = false;
3641 continue;
3642 }
3643 first_param = false;
3644
50450603
TZ		 3645 data->params[data->n_params++] = saved_param;
3646 }
3647 out:
3648 return ret;
3649}
3650
d0cd871b 3651static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
7d18a10c
TZ		 3652 enum handler_id handler)
3653{
3654 char *action_name;
3655 int ret = 0;
3656
3657 strsep(&str, ".");
3658 if (!str) {
d0cd871b 3659 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3660 ret = -EINVAL;
3661 goto out;
3662 }
3663
3664 action_name = strsep(&str, "(");
3665 if (!action_name || !str) {
d0cd871b 3666 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
7d18a10c
TZ		 3667 ret = -EINVAL;
3668 goto out;
3669 }
3670
3671 if (str_has_prefix(action_name, "save")) {
3672 char *params = strsep(&str, ")");
3673
3674 if (!params) {
d0cd871b 3675 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
7d18a10c
TZ		 3676 ret = -EINVAL;
3677 goto out;
3678 }
3679
d0cd871b 3680 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3681 if (ret)
3682 goto out;
3683
3684 if (handler == HANDLER_ONMAX)
466f4528 3685 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3686 else if (handler == HANDLER_ONCHANGE)
3687 data->track_data.check_val = check_track_val_changed;
466f4528 3688 else {
d0cd871b 3689 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
466f4528
TZ		 3690 ret = -EINVAL;
3691 goto out;
3692 }
7d18a10c 3693
466f4528
TZ		 3694 data->track_data.save_data = save_track_data_vars;
3695 data->fn = ontrack_action;
7d18a10c 3696 data->action = ACTION_SAVE;
a3785b7e
TZ		 3697 } else if (str_has_prefix(action_name, "snapshot")) {
3698 char *params = strsep(&str, ")");
3699
3700 if (!str) {
d0cd871b 3701 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
a3785b7e
TZ		 3702 ret = -EINVAL;
3703 goto out;
3704 }
3705
3706 if (handler == HANDLER_ONMAX)
3707 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3708 else if (handler == HANDLER_ONCHANGE)
3709 data->track_data.check_val = check_track_val_changed;
a3785b7e 3710 else {
d0cd871b 3711 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
a3785b7e
TZ		 3712 ret = -EINVAL;
3713 goto out;
3714 }
3715
3716 data->track_data.save_data = save_track_data_snapshot;
3717 data->fn = ontrack_action;
3718 data->action = ACTION_SNAPSHOT;
7d18a10c
TZ		 3719 } else {
3720 char *params = strsep(&str, ")");
3721
e91eefd7
TZ		 3722 if (str_has_prefix(action_name, "trace"))
3723 data->use_trace_keyword = true;
3724
7d18a10c 3725 if (params) {
d0cd871b 3726 ret = parse_action_params(tr, params, data);
7d18a10c
TZ		 3727 if (ret)
3728 goto out;
3729 }
3730
466f4528
TZ		 3731 if (handler == HANDLER_ONMAX)
3732 data->track_data.check_val = check_track_val_max;
dff81f55
TZ		 3733 else if (handler == HANDLER_ONCHANGE)
3734 data->track_data.check_val = check_track_val_changed;
466f4528
TZ		 3735
3736 if (handler != HANDLER_ONMATCH) {
3737 data->track_data.save_data = action_trace;
3738 data->fn = ontrack_action;
3739 } else
3740 data->fn = action_trace;
3741
7d18a10c
TZ		 3742 data->action = ACTION_TRACE;
3743 }
3744
3745 data->action_name = kstrdup(action_name, GFP_KERNEL);
3746 if (!data->action_name) {
3747 ret = -ENOMEM;
3748 goto out;
3749 }
3750
3751 data->handler = handler;
3752 out:
3753 return ret;
3754}
3755
466f4528
TZ		 3756static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
3757 char *str, enum handler_id handler)
50450603 3758{
50450603
TZ		 3759 struct action_data *data;
3760 int ret = -EINVAL;
466f4528 3761 char *var_str;
50450603
TZ		 3762
3763 data = kzalloc(sizeof(*data), GFP_KERNEL);
3764 if (!data)
3765 return ERR_PTR(-ENOMEM);
3766
466f4528
TZ		 3767 var_str = strsep(&str, ")");
3768 if (!var_str || !str) {
50450603
TZ		 3769 ret = -EINVAL;
3770 goto free;
3771 }
3772
466f4528
TZ		 3773 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
3774 if (!data->track_data.var_str) {
50450603
TZ		 3775 ret = -ENOMEM;
3776 goto free;
3777 }
3778
d0cd871b 3779 ret = action_parse(hist_data->event_file->tr, str, data, handler);
7d18a10c 3780 if (ret)
50450603 3781 goto free;
50450603
TZ		 3782 out:
3783 return data;
3784 free:
466f4528 3785 track_data_destroy(hist_data, data);
50450603
TZ		 3786 data = ERR_PTR(ret);
3787 goto out;
3788}
3789
c282a386
TZ		 3790static void onmatch_destroy(struct action_data *data)
3791{
c3e49506
TZ		 3792 kfree(data->match_data.event);
3793 kfree(data->match_data.event_system);
c282a386 3794
c3e49506 3795 action_data_destroy(data);
c282a386
TZ		 3796}
3797
02205a67
TZ		 3798static void destroy_field_var(struct field_var *field_var)
3799{
3800 if (!field_var)
3801 return;
3802
3803 destroy_hist_field(field_var->var, 0);
3804 destroy_hist_field(field_var->val, 0);
3805
3806 kfree(field_var);
3807}
3808
3809static void destroy_field_vars(struct hist_trigger_data *hist_data)
3810{
3811 unsigned int i;
3812
3813 for (i = 0; i < hist_data->n_field_vars; i++)
3814 destroy_field_var(hist_data->field_vars[i]);
9da73974
VS		 3815
3816 for (i = 0; i < hist_data->n_save_vars; i++)
3817 destroy_field_var(hist_data->save_vars[i]);
02205a67
TZ		 3818}
3819
c282a386
TZ		 3820static void save_field_var(struct hist_trigger_data *hist_data,
3821 struct field_var *field_var)
02205a67
TZ		 3822{
3823 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3824
3825 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3826 hist_data->n_field_var_str++;
3827}
3828
c282a386 3829
c282a386
TZ		 3830static int check_synth_field(struct synth_event *event,
3831 struct hist_field *hist_field,
3832 unsigned int field_pos)
3833{
3834 struct synth_field *field;
3835
3836 if (field_pos >= event->n_fields)
3837 return -EINVAL;
3838
3839 field = event->fields[field_pos];
3840
bd82631d
TZ		 3841 /*
3842 * A dynamic string synth field can accept static or
3843 * dynamic. A static string synth field can only accept a
3844 * same-sized static string, which is checked for later.
3845 */
3846 if (strstr(hist_field->type, "char[") && field->is_string
3847 && field->is_dynamic)
3848 return 0;
3849
b05e89ae
MH		 3850 if (strcmp(field->type, hist_field->type) != 0) {
3851 if (field->size != hist_field->size ||
450fec13 3852 (!field->is_string && field->is_signed != hist_field->is_signed))
b05e89ae
MH		 3853 return -EINVAL;
3854 }
c282a386
TZ		 3855
3856 return 0;
3857}
3858
c282a386 3859static struct hist_field *
7d18a10c
TZ		 3860trace_action_find_var(struct hist_trigger_data *hist_data,
3861 struct action_data *data,
3862 char *system, char *event, char *var)
c282a386 3863{
d0cd871b 3864 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 3865 struct hist_field *hist_field;
3866
3867 var++; /* skip '$' */
3868
3869 hist_field = find_target_event_var(hist_data, system, event, var);
3870 if (!hist_field) {
7d18a10c 3871 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 3872 system = data->match_data.event_system;
3873 event = data->match_data.event;
c282a386
TZ		 3874 }
3875
3876 hist_field = find_event_var(hist_data, system, event, var);
3877 }
3878
f404da6e 3879 if (!hist_field)
d0cd871b 3880 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
f404da6e 3881
c282a386
TZ		 3882 return hist_field;
3883}
3884
3885static struct hist_field *
7d18a10c
TZ		 3886trace_action_create_field_var(struct hist_trigger_data *hist_data,
3887 struct action_data *data, char *system,
3888 char *event, char *var)
c282a386
TZ		 3889{
3890 struct hist_field *hist_field = NULL;
3891 struct field_var *field_var;
3892
3893 /*
3894 * First try to create a field var on the target event (the
3895 * currently being defined). This will create a variable for
3896 * unqualified fields on the target event, or if qualified,
3897 * target fields that have qualified names matching the target.
3898 */
3899 field_var = create_target_field_var(hist_data, system, event, var);
3900
3901 if (field_var && !IS_ERR(field_var)) {
3902 save_field_var(hist_data, field_var);
3903 hist_field = field_var->var;
3904 } else {
3905 field_var = NULL;
3906 /*
2b5894cc 3907 * If no explicit system.event is specified, default to
c282a386
TZ		 3908 * looking for fields on the onmatch(system.event.xxx)
3909 * event.
3910 */
7d18a10c 3911 if (!system && data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 3912 system = data->match_data.event_system;
3913 event = data->match_data.event;
c282a386
TZ		 3914 }
3915
5acce0bf
SRV		 3916 if (!event)
3917 goto free;
c282a386
TZ		 3918 /*
3919 * At this point, we're looking at a field on another
3920 * event. Because we can't modify a hist trigger on
3921 * another event to add a variable for a field, we need
3922 * to create a new trigger on that event and create the
3923 * variable at the same time.
3924 */
3925 hist_field = create_field_var_hist(hist_data, system, event, var);
3926 if (IS_ERR(hist_field))
3927 goto free;
3928 }
3929 out:
3930 return hist_field;
3931 free:
3932 destroy_field_var(field_var);
3933 hist_field = NULL;
3934 goto out;
3935}
3936
7d18a10c
TZ		 3937static int trace_action_create(struct hist_trigger_data *hist_data,
3938 struct action_data *data)
c282a386 3939{
d0cd871b 3940 struct trace_array *tr = hist_data->event_file->tr;
c282a386
TZ		 3941 char *event_name, *param, *system = NULL;
3942 struct hist_field *hist_field, *var_ref;
d380dcde 3943 unsigned int i;
c282a386
TZ		 3944 unsigned int field_pos = 0;
3945 struct synth_event *event;
e91eefd7 3946 char *synth_event_name;
d380dcde 3947 int var_ref_idx, ret = 0;
c282a386 3948
0e2b81f7
MH		 3949 lockdep_assert_held(&event_mutex);
3950
82470f7d
ZY		 3951 /* Sanity check to avoid out-of-bound write on 'data->var_ref_idx' */
3952 if (data->n_params > SYNTH_FIELDS_MAX)
3953 return -EINVAL;
3954
e91eefd7
TZ		 3955 if (data->use_trace_keyword)
3956 synth_event_name = data->synth_event_name;
3957 else
3958 synth_event_name = data->action_name;
3959
3960 event = find_synth_event(synth_event_name);
c282a386 3961 if (!event) {
d0cd871b 3962 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
c282a386
TZ		 3963 return -EINVAL;
3964 }
7d18a10c 3965
c282a386 3966 event->ref++;
c282a386 3967
c282a386
TZ		 3968 for (i = 0; i < data->n_params; i++) {
3969 char *p;
3970
3971 p = param = kstrdup(data->params[i], GFP_KERNEL);
3972 if (!param) {
3973 ret = -ENOMEM;
3974 goto err;
3975 }
3976
3977 system = strsep(&param, ".");
3978 if (!param) {
3979 param = (char *)system;
3980 system = event_name = NULL;
3981 } else {
3982 event_name = strsep(&param, ".");
3983 if (!param) {
3984 kfree(p);
3985 ret = -EINVAL;
3986 goto err;
3987 }
3988 }
3989
3990 if (param[0] == '$')
7d18a10c
TZ		 3991 hist_field = trace_action_find_var(hist_data, data,
3992 system, event_name,
3993 param);
c282a386 3994 else
7d18a10c
TZ		 3995 hist_field = trace_action_create_field_var(hist_data,
3996 data,
3997 system,
3998 event_name,
3999 param);
c282a386
TZ		 4000
4001 if (!hist_field) {
4002 kfree(p);
4003 ret = -EINVAL;
4004 goto err;
4005 }
4006
4007 if (check_synth_field(event, hist_field, field_pos) == 0) {
de40f033
TZ		 4008 var_ref = create_var_ref(hist_data, hist_field,
4009 system, event_name);
c282a386
TZ		 4010 if (!var_ref) {
4011 kfree(p);
4012 ret = -ENOMEM;
4013 goto err;
4014 }
4015
d380dcde
TZ		 4016 var_ref_idx = find_var_ref_idx(hist_data, var_ref);
4017 if (WARN_ON(var_ref_idx < 0)) {
e629e7b5 4018 kfree(p);
d380dcde
TZ		 4019 ret = var_ref_idx;
4020 goto err;
4021 }
4022
4023 data->var_ref_idx[i] = var_ref_idx;
4024
c282a386
TZ		 4025 field_pos++;
4026 kfree(p);
4027 continue;
4028 }
4029
d0cd871b 4030 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
c282a386
TZ		 4031 kfree(p);
4032 ret = -EINVAL;
4033 goto err;
4034 }
4035
4036 if (field_pos != event->n_fields) {
d0cd871b 4037 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
c282a386
TZ		 4038 ret = -EINVAL;
4039 goto err;
4040 }
4041
c3e49506 4042 data->synth_event = event;
c282a386
TZ		 4043 out:
4044 return ret;
4045 err:
c282a386 4046 event->ref--;
c282a386
TZ		 4047
4048 goto out;
4049}
4050
7d18a10c
TZ		 4051static int action_create(struct hist_trigger_data *hist_data,
4052 struct action_data *data)
4053{
a3785b7e 4054 struct trace_event_file *file = hist_data->event_file;
d0cd871b 4055 struct trace_array *tr = file->tr;
a3785b7e 4056 struct track_data *track_data;
7d18a10c
TZ		 4057 struct field_var *field_var;
4058 unsigned int i;
4059 char *param;
4060 int ret = 0;
4061
4062 if (data->action == ACTION_TRACE)
4063 return trace_action_create(hist_data, data);
4064
a3785b7e
TZ		 4065 if (data->action == ACTION_SNAPSHOT) {
4066 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4067 if (IS_ERR(track_data)) {
4068 ret = PTR_ERR(track_data);
4069 goto out;
4070 }
4071
4072 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4073 cond_snapshot_update);
4074 if (ret)
4075 track_data_free(track_data);
4076
4077 goto out;
4078 }
4079
7d18a10c
TZ		 4080 if (data->action == ACTION_SAVE) {
4081 if (hist_data->n_save_vars) {
4082 ret = -EEXIST;
d0cd871b 4083 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
7d18a10c
TZ		 4084 goto out;
4085 }
4086
4087 for (i = 0; i < data->n_params; i++) {
4088 param = kstrdup(data->params[i], GFP_KERNEL);
4089 if (!param) {
4090 ret = -ENOMEM;
4091 goto out;
4092 }
4093
4094 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4095 if (IS_ERR(field_var)) {
d0cd871b
SRV		 4096 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
4097 errpos(param));
7d18a10c
TZ		 4098 ret = PTR_ERR(field_var);
4099 kfree(param);
4100 goto out;
4101 }
4102
4103 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4104 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4105 hist_data->n_save_var_str++;
4106 kfree(param);
4107 }
4108 }
4109 out:
4110 return ret;
4111}
4112
4113static int onmatch_create(struct hist_trigger_data *hist_data,
4114 struct action_data *data)
4115{
4116 return action_create(hist_data, data);
4117}
4118
c282a386
TZ		 4119static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4120{
4121 char *match_event, *match_event_system;
c282a386
TZ		 4122 struct action_data *data;
4123 int ret = -EINVAL;
4124
4125 data = kzalloc(sizeof(*data), GFP_KERNEL);
4126 if (!data)
4127 return ERR_PTR(-ENOMEM);
4128
4129 match_event = strsep(&str, ")");
f404da6e 4130 if (!match_event || !str) {
d0cd871b 4131 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
c282a386 4132 goto free;
f404da6e 4133 }
c282a386
TZ		 4134
4135 match_event_system = strsep(&match_event, ".");
f404da6e 4136 if (!match_event) {
d0cd871b 4137 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
c282a386 4138 goto free;
f404da6e 4139 }
c282a386 4140
f404da6e 4141 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
d0cd871b 4142 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
c282a386 4143 goto free;
f404da6e 4144 }
c282a386 4145
c3e49506
TZ		 4146 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4147 if (!data->match_data.event) {
c282a386
TZ		 4148 ret = -ENOMEM;
4149 goto free;
4150 }
4151
c3e49506
TZ		 4152 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4153 if (!data->match_data.event_system) {
c282a386
TZ		 4154 ret = -ENOMEM;
4155 goto free;
4156 }
4157
d0cd871b 4158 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
c282a386
TZ		 4159 if (ret)
4160 goto free;
4161 out:
4162 return data;
4163 free:
4164 onmatch_destroy(data);
4165 data = ERR_PTR(ret);
4166 goto out;
4167}
4168
7ef224d1
TZ		 4169static int create_hitcount_val(struct hist_trigger_data *hist_data)
4170{
4171 hist_data->fields[HITCOUNT_IDX] =
30350d65 4172 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
7ef224d1
TZ		 4173 if (!hist_data->fields[HITCOUNT_IDX])
4174 return -ENOMEM;
4175
4176 hist_data->n_vals++;
30350d65 4177 hist_data->n_fields++;
7ef224d1
TZ		 4178
4179 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4180 return -EINVAL;
4181
4182 return 0;
4183}
4184
30350d65
TZ		 4185static int __create_val_field(struct hist_trigger_data *hist_data,
4186 unsigned int val_idx,
4187 struct trace_event_file *file,
4188 char *var_name, char *field_str,
4189 unsigned long flags)
f2606835 4190{
100719dc 4191 struct hist_field *hist_field;
9710b2f3 4192 int ret = 0, n_subexprs = 0;
f2606835 4193
9710b2f3 4194 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, &n_subexprs);
100719dc
TZ		 4195 if (IS_ERR(hist_field)) {
4196 ret = PTR_ERR(hist_field);
f2606835
TZ		 4197 goto out;
4198 }
4199
100719dc
TZ		 4200 hist_data->fields[val_idx] = hist_field;
4201
f2606835 4202 ++hist_data->n_vals;
30350d65 4203 ++hist_data->n_fields;
f2606835 4204
30350d65 4205 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
f2606835
TZ		 4206 ret = -EINVAL;
4207 out:
4208 return ret;
4209}
4210
30350d65
TZ		 4211static int create_val_field(struct hist_trigger_data *hist_data,
4212 unsigned int val_idx,
4213 struct trace_event_file *file,
4214 char *field_str)
4215{
4216 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4217 return -EINVAL;
4218
4219 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4220}
4221
2d601b98 4222static const char no_comm[] = "(no comm)";
ed2cf907
SRV		 4223
4224static u64 hist_field_execname(struct hist_field *hist_field,
4225 struct tracing_map_elt *elt,
4226 struct trace_buffer *buffer,
4227 struct ring_buffer_event *rbe,
4228 void *event)
4229{
4230 struct hist_elt_data *elt_data;
4231
4232 if (WARN_ON_ONCE(!elt))
4233 return (u64)(unsigned long)no_comm;
4234
4235 elt_data = elt->private_data;
4236
4237 if (WARN_ON_ONCE(!elt_data->comm))
4238 return (u64)(unsigned long)no_comm;
4239
4240 return (u64)(unsigned long)(elt_data->comm);
4241}
4242
86087383
SRG		 4243static u64 hist_fn_call(struct hist_field *hist_field,
4244 struct tracing_map_elt *elt,
4245 struct trace_buffer *buffer,
4246 struct ring_buffer_event *rbe,
4247 void *event)
4248{
4249 switch (hist_field->fn_num) {
4250 case HIST_FIELD_FN_VAR_REF:
4251 return hist_field_var_ref(hist_field, elt, buffer, rbe, event);
4252 case HIST_FIELD_FN_COUNTER:
4253 return hist_field_counter(hist_field, elt, buffer, rbe, event);
4254 case HIST_FIELD_FN_CONST:
4255 return hist_field_const(hist_field, elt, buffer, rbe, event);
4256 case HIST_FIELD_FN_LOG2:
4257 return hist_field_log2(hist_field, elt, buffer, rbe, event);
4258 case HIST_FIELD_FN_BUCKET:
4259 return hist_field_bucket(hist_field, elt, buffer, rbe, event);
4260 case HIST_FIELD_FN_TIMESTAMP:
4261 return hist_field_timestamp(hist_field, elt, buffer, rbe, event);
4262 case HIST_FIELD_FN_CPU:
4263 return hist_field_cpu(hist_field, elt, buffer, rbe, event);
4264 case HIST_FIELD_FN_STRING:
4265 return hist_field_string(hist_field, elt, buffer, rbe, event);
4266 case HIST_FIELD_FN_DYNSTRING:
4267 return hist_field_dynstring(hist_field, elt, buffer, rbe, event);
4268 case HIST_FIELD_FN_RELDYNSTRING:
4269 return hist_field_reldynstring(hist_field, elt, buffer, rbe, event);
4270 case HIST_FIELD_FN_PSTRING:
4271 return hist_field_pstring(hist_field, elt, buffer, rbe, event);
4272 case HIST_FIELD_FN_S64:
4273 return hist_field_s64(hist_field, elt, buffer, rbe, event);
4274 case HIST_FIELD_FN_U64:
4275 return hist_field_u64(hist_field, elt, buffer, rbe, event);
4276 case HIST_FIELD_FN_S32:
4277 return hist_field_s32(hist_field, elt, buffer, rbe, event);
4278 case HIST_FIELD_FN_U32:
4279 return hist_field_u32(hist_field, elt, buffer, rbe, event);
4280 case HIST_FIELD_FN_S16:
4281 return hist_field_s16(hist_field, elt, buffer, rbe, event);
4282 case HIST_FIELD_FN_U16:
4283 return hist_field_u16(hist_field, elt, buffer, rbe, event);
4284 case HIST_FIELD_FN_S8:
4285 return hist_field_s8(hist_field, elt, buffer, rbe, event);
4286 case HIST_FIELD_FN_U8:
4287 return hist_field_u8(hist_field, elt, buffer, rbe, event);
4288 case HIST_FIELD_FN_UMINUS:
4289 return hist_field_unary_minus(hist_field, elt, buffer, rbe, event);
4290 case HIST_FIELD_FN_MINUS:
4291 return hist_field_minus(hist_field, elt, buffer, rbe, event);
4292 case HIST_FIELD_FN_PLUS:
4293 return hist_field_plus(hist_field, elt, buffer, rbe, event);
4294 case HIST_FIELD_FN_DIV:
4295 return hist_field_div(hist_field, elt, buffer, rbe, event);
4296 case HIST_FIELD_FN_MULT:
4297 return hist_field_mult(hist_field, elt, buffer, rbe, event);
4298 case HIST_FIELD_FN_DIV_POWER2:
4299 return div_by_power_of_two(hist_field, elt, buffer, rbe, event);
4300 case HIST_FIELD_FN_DIV_NOT_POWER2:
4301 return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event);
4302 case HIST_FIELD_FN_DIV_MULT_SHIFT:
4303 return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event);
4304 case HIST_FIELD_FN_EXECNAME:
4305 return hist_field_execname(hist_field, elt, buffer, rbe, event);
4306 default:
4307 return 0;
4308 }
4309}
4310
ed2cf907
SRV		 4311/* Convert a var that points to common_pid.execname to a string */
4312static void update_var_execname(struct hist_field *hist_field)
4313{
4314 hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR |
4315 HIST_FIELD_FL_EXECNAME;
4316 hist_field->size = MAX_FILTER_STR_VAL;
4317 hist_field->is_signed = 0;
4318
4319 kfree_const(hist_field->type);
4320 hist_field->type = "char[]";
4321
86087383 4322 hist_field->fn_num = HIST_FIELD_FN_EXECNAME;
ed2cf907
SRV		 4323}
4324
30350d65
TZ		 4325static int create_var_field(struct hist_trigger_data *hist_data,
4326 unsigned int val_idx,
4327 struct trace_event_file *file,
4328 char *var_name, char *expr_str)
4329{
d0cd871b 4330 struct trace_array *tr = hist_data->event_file->tr;
30350d65 4331 unsigned long flags = 0;
63a1e5de 4332 int ret;
30350d65
TZ		 4333
4334 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4335 return -EINVAL;
f404da6e 4336
30350d65 4337 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
d0cd871b 4338 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
30350d65
TZ		 4339 return -EINVAL;
4340 }
4341
4342 flags |= HIST_FIELD_FL_VAR;
4343 hist_data->n_vars++;
4344 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4345 return -EINVAL;
4346
63a1e5de
TZ		 4347 ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4348
ed2cf907
SRV		 4349 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME)
4350 update_var_execname(hist_data->fields[val_idx]);
4351
6d9bd139 4352 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
63a1e5de
TZ		 4353 hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
4354
4355 return ret;
30350d65
TZ		 4356}
4357
7ef224d1
TZ		 4358static int create_val_fields(struct hist_trigger_data *hist_data,
4359 struct trace_event_file *file)
4360{
5f2e094e 4361 unsigned int i, j = 1, n_hitcount = 0;
f2606835 4362 char *fields_str, *field_str;
7ef224d1
TZ		 4363 int ret;
4364
4365 ret = create_hitcount_val(hist_data);
f2606835
TZ		 4366 if (ret)
4367 goto out;
7ef224d1 4368
f2606835
TZ		 4369 fields_str = hist_data->attrs->vals_str;
4370 if (!fields_str)
4371 goto out;
4372
f2606835
TZ		 4373 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4374 j < TRACING_MAP_VALS_MAX; i++) {
4375 field_str = strsep(&fields_str, ",");
4376 if (!field_str)
4377 break;
30350d65 4378
5f2e094e
TZ		 4379 if (strcmp(field_str, "hitcount") == 0) {
4380 if (!n_hitcount++)
4381 continue;
4382 }
30350d65 4383
f2606835
TZ		 4384 ret = create_val_field(hist_data, j++, file, field_str);
4385 if (ret)
4386 goto out;
4387 }
30350d65 4388
f2606835
TZ		 4389 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4390 ret = -EINVAL;
4391 out:
ccf47f5c
MHG		 4392 /* There is only raw hitcount but nohitcount suppresses it. */
4393 if (j == 1 && hist_data->attrs->no_hitcount) {
4394 hist_err(hist_data->event_file->tr, HIST_ERR_NEED_NOHC_VAL, 0);
4395 ret = -ENOENT;
4396 }
4397
7ef224d1
TZ		 4398 return ret;
4399}
4400
4401static int create_key_field(struct hist_trigger_data *hist_data,
4402 unsigned int key_idx,
76a3b0c8 4403 unsigned int key_offset,
7ef224d1
TZ		 4404 struct trace_event_file *file,
4405 char *field_str)
4406{
d0cd871b 4407 struct trace_array *tr = hist_data->event_file->tr;
30350d65 4408 struct hist_field *hist_field = NULL;
7ef224d1
TZ		 4409 unsigned long flags = 0;
4410 unsigned int key_size;
9710b2f3 4411 int ret = 0, n_subexprs = 0;
7ef224d1 4412
30350d65 4413 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
7ef224d1
TZ		 4414 return -EINVAL;
4415
4416 flags |= HIST_FIELD_FL_KEY;
4417
69a0200c
TZ		 4418 if (strcmp(field_str, "stacktrace") == 0) {
4419 flags |= HIST_FIELD_FL_STACKTRACE;
4420 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
30350d65 4421 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
69a0200c 4422 } else {
100719dc 4423 hist_field = parse_expr(hist_data, file, field_str, flags,
9710b2f3 4424 NULL, &n_subexprs);
100719dc
TZ		 4425 if (IS_ERR(hist_field)) {
4426 ret = PTR_ERR(hist_field);
4427 goto out;
69a0200c
TZ		 4428 }
4429
c8d94a18 4430 if (field_has_hist_vars(hist_field, 0)) {
d0cd871b 4431 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
067fe038
TZ		 4432 destroy_hist_field(hist_field, 0);
4433 ret = -EINVAL;
4434 goto out;
4435 }
4436
100719dc 4437 key_size = hist_field->size;
7ef224d1
TZ		 4438 }
4439
100719dc 4440 hist_data->fields[key_idx] = hist_field;
7ef224d1
TZ		 4441
4442 key_size = ALIGN(key_size, sizeof(u64));
4443 hist_data->fields[key_idx]->size = key_size;
76a3b0c8 4444 hist_data->fields[key_idx]->offset = key_offset;
100719dc 4445
76a3b0c8 4446 hist_data->key_size += key_size;
100719dc 4447
7ef224d1
TZ		 4448 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4449 ret = -EINVAL;
4450 goto out;
4451 }
4452
4453 hist_data->n_keys++;
30350d65 4454 hist_data->n_fields++;
7ef224d1
TZ		 4455
4456 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4457 return -EINVAL;
4458
4459 ret = key_size;
4460 out:
4461 return ret;
4462}
4463
4464static int create_key_fields(struct hist_trigger_data *hist_data,
4465 struct trace_event_file *file)
4466{
76a3b0c8 4467 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
7ef224d1
TZ		 4468 char *fields_str, *field_str;
4469 int ret = -EINVAL;
4470
4471 fields_str = hist_data->attrs->keys_str;
4472 if (!fields_str)
4473 goto out;
4474
76a3b0c8 4475 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
7ef224d1
TZ		 4476 field_str = strsep(&fields_str, ",");
4477 if (!field_str)
4478 break;
76a3b0c8
TZ		 4479 ret = create_key_field(hist_data, i, key_offset,
4480 file, field_str);
7ef224d1
TZ		 4481 if (ret < 0)
4482 goto out;
76a3b0c8 4483 key_offset += ret;
7ef224d1
TZ		 4484 }
4485 if (fields_str) {
4486 ret = -EINVAL;
4487 goto out;
4488 }
4489 ret = 0;
4490 out:
4491 return ret;
4492}
4493
30350d65
TZ		 4494static int create_var_fields(struct hist_trigger_data *hist_data,
4495 struct trace_event_file *file)
4496{
4497 unsigned int i, j = hist_data->n_vals;
4498 int ret = 0;
4499
4500 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4501
4502 for (i = 0; i < n_vars; i++) {
4503 char *var_name = hist_data->attrs->var_defs.name[i];
4504 char *expr = hist_data->attrs->var_defs.expr[i];
4505
4506 ret = create_var_field(hist_data, j++, file, var_name, expr);
4507 if (ret)
4508 goto out;
4509 }
4510 out:
4511 return ret;
4512}
4513
4514static void free_var_defs(struct hist_trigger_data *hist_data)
4515{
4516 unsigned int i;
4517
4518 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4519 kfree(hist_data->attrs->var_defs.name[i]);
4520 kfree(hist_data->attrs->var_defs.expr[i]);
4521 }
4522
4523 hist_data->attrs->var_defs.n_vars = 0;
4524}
4525
4526static int parse_var_defs(struct hist_trigger_data *hist_data)
4527{
d0cd871b 4528 struct trace_array *tr = hist_data->event_file->tr;
30350d65
TZ		 4529 char *s, *str, *var_name, *field_str;
4530 unsigned int i, j, n_vars = 0;
4531 int ret = 0;
4532
4533 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4534 str = hist_data->attrs->assignment_str[i];
4535 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4536 field_str = strsep(&str, ",");
4537 if (!field_str)
4538 break;
4539
4540 var_name = strsep(&field_str, "=");
4541 if (!var_name || !field_str) {
d0cd871b
SRV		 4542 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4543 errpos(var_name));
30350d65
TZ		 4544 ret = -EINVAL;
4545 goto free;
4546 }
4547
4548 if (n_vars == TRACING_MAP_VARS_MAX) {
d0cd871b 4549 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
30350d65
TZ		 4550 ret = -EINVAL;
4551 goto free;
4552 }
4553
4554 s = kstrdup(var_name, GFP_KERNEL);
4555 if (!s) {
4556 ret = -ENOMEM;
4557 goto free;
4558 }
4559 hist_data->attrs->var_defs.name[n_vars] = s;
4560
4561 s = kstrdup(field_str, GFP_KERNEL);
4562 if (!s) {
7edc3945
ZY		 4563 kfree(hist_data->attrs->var_defs.name[n_vars]);
4564 hist_data->attrs->var_defs.name[n_vars] = NULL;
30350d65
TZ		 4565 ret = -ENOMEM;
4566 goto free;
4567 }
4568 hist_data->attrs->var_defs.expr[n_vars++] = s;
4569
4570 hist_data->attrs->var_defs.n_vars = n_vars;
4571 }
4572 }
4573
4574 return ret;
4575 free:
4576 free_var_defs(hist_data);
4577
4578 return ret;
4579}
4580
7ef224d1
TZ		 4581static int create_hist_fields(struct hist_trigger_data *hist_data,
4582 struct trace_event_file *file)
4583{
4584 int ret;
4585
30350d65
TZ		 4586 ret = parse_var_defs(hist_data);
4587 if (ret)
fb991f19 4588 return ret;
30350d65 4589
7ef224d1
TZ		 4590 ret = create_val_fields(hist_data, file);
4591 if (ret)
4592 goto out;
4593
30350d65 4594 ret = create_var_fields(hist_data, file);
7ef224d1
TZ		 4595 if (ret)
4596 goto out;
4597
30350d65 4598 ret = create_key_fields(hist_data, file);
fb991f19 4599
7ef224d1 4600 out:
30350d65
TZ		 4601 free_var_defs(hist_data);
4602
7ef224d1
TZ		 4603 return ret;
4604}
4605
4de26c8c 4606static int is_descending(struct trace_array *tr, const char *str)
e62347d2
TZ		 4607{
4608 if (!str)
4609 return 0;
4610
4611 if (strcmp(str, "descending") == 0)
4612 return 1;
4613
4614 if (strcmp(str, "ascending") == 0)
4615 return 0;
4616
4de26c8c
TZ		 4617 hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str));
4618
e62347d2
TZ		 4619 return -EINVAL;
4620}
4621
7ef224d1
TZ		 4622static int create_sort_keys(struct hist_trigger_data *hist_data)
4623{
4de26c8c 4624 struct trace_array *tr = hist_data->event_file->tr;
e62347d2 4625 char *fields_str = hist_data->attrs->sort_key_str;
e62347d2
TZ		 4626 struct tracing_map_sort_key *sort_key;
4627 int descending, ret = 0;
30350d65 4628 unsigned int i, j, k;
e62347d2
TZ		 4629
4630 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4631
4632 if (!fields_str)
4633 goto out;
4634
e62347d2 4635 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
85013256 4636 struct hist_field *hist_field;
e62347d2 4637 char *field_str, *field_name;
85013256 4638 const char *test_name;
e62347d2
TZ		 4639
4640 sort_key = &hist_data->sort_keys[i];
4641
4642 field_str = strsep(&fields_str, ",");
b527b638
TZ		 4643 if (!field_str)
4644 break;
4645
4646 if (!*field_str) {
4647 ret = -EINVAL;
4de26c8c 4648 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
e62347d2
TZ		 4649 break;
4650 }
4651
4652 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4de26c8c 4653 hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort="));
e62347d2
TZ		 4654 ret = -EINVAL;
4655 break;
4656 }
7ef224d1 4657
e62347d2 4658 field_name = strsep(&field_str, ".");
b527b638 4659 if (!field_name || !*field_name) {
e62347d2 4660 ret = -EINVAL;
4de26c8c 4661 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
e62347d2
TZ		 4662 break;
4663 }
4664
4665 if (strcmp(field_name, "hitcount") == 0) {
4de26c8c 4666 descending = is_descending(tr, field_str);
e62347d2
TZ		 4667 if (descending < 0) {
4668 ret = descending;
4669 break;
4670 }
4671 sort_key->descending = descending;
4672 continue;
4673 }
7ef224d1 4674
30350d65
TZ		 4675 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4676 unsigned int idx;
4677
85013256 4678 hist_field = hist_data->fields[j];
30350d65
TZ		 4679 if (hist_field->flags & HIST_FIELD_FL_VAR)
4680 continue;
4681
4682 idx = k++;
4683
85013256
TZ		 4684 test_name = hist_field_name(hist_field, 0);
4685
4686 if (strcmp(field_name, test_name) == 0) {
30350d65 4687 sort_key->field_idx = idx;
4de26c8c 4688 descending = is_descending(tr, field_str);
e62347d2
TZ		 4689 if (descending < 0) {
4690 ret = descending;
4691 goto out;
4692 }
4693 sort_key->descending = descending;
4694 break;
4695 }
4696 }
4697 if (j == hist_data->n_fields) {
4698 ret = -EINVAL;
4de26c8c 4699 hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name));
e62347d2
TZ		 4700 break;
4701 }
4702 }
30350d65 4703
e62347d2
TZ		 4704 hist_data->n_sort_keys = i;
4705 out:
7ef224d1
TZ		 4706 return ret;
4707}
4708
0212e2aa
TZ		 4709static void destroy_actions(struct hist_trigger_data *hist_data)
4710{
4711 unsigned int i;
4712
4713 for (i = 0; i < hist_data->n_actions; i++) {
4714 struct action_data *data = hist_data->actions[i];
4715
7d18a10c 4716 if (data->handler == HANDLER_ONMATCH)
c282a386 4717 onmatch_destroy(data);
dff81f55
TZ		 4718 else if (data->handler == HANDLER_ONMAX ||
4719 data->handler == HANDLER_ONCHANGE)
466f4528 4720 track_data_destroy(hist_data, data);
c282a386
TZ		 4721 else
4722 kfree(data);
0212e2aa
TZ		 4723 }
4724}
4725
4726static int parse_actions(struct hist_trigger_data *hist_data)
4727{
c282a386
TZ		 4728 struct trace_array *tr = hist_data->event_file->tr;
4729 struct action_data *data;
0212e2aa
TZ		 4730 unsigned int i;
4731 int ret = 0;
4732 char *str;
036876fa 4733 int len;
0212e2aa
TZ		 4734
4735 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4736 str = hist_data->attrs->action_str[i];
c282a386 4737
036876fa
SRV		 4738 if ((len = str_has_prefix(str, "onmatch("))) {
4739 char *action_str = str + len;
c282a386
TZ		 4740
4741 data = onmatch_parse(tr, action_str);
4742 if (IS_ERR(data)) {
4743 ret = PTR_ERR(data);
4744 break;
4745 }
036876fa
SRV		 4746 } else if ((len = str_has_prefix(str, "onmax("))) {
4747 char *action_str = str + len;
50450603 4748
466f4528
TZ		 4749 data = track_data_parse(hist_data, action_str,
4750 HANDLER_ONMAX);
50450603
TZ		 4751 if (IS_ERR(data)) {
4752 ret = PTR_ERR(data);
4753 break;
4754 }
dff81f55
TZ		 4755 } else if ((len = str_has_prefix(str, "onchange("))) {
4756 char *action_str = str + len;
4757
4758 data = track_data_parse(hist_data, action_str,
4759 HANDLER_ONCHANGE);
4760 if (IS_ERR(data)) {
4761 ret = PTR_ERR(data);
4762 break;
4763 }
c282a386
TZ		 4764 } else {
4765 ret = -EINVAL;
4766 break;
4767 }
4768
4769 hist_data->actions[hist_data->n_actions++] = data;
0212e2aa
TZ		 4770 }
4771
4772 return ret;
4773}
4774
7d18a10c 4775static int create_actions(struct hist_trigger_data *hist_data)
0212e2aa
TZ		 4776{
4777 struct action_data *data;
4778 unsigned int i;
4779 int ret = 0;
4780
4781 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4782 data = hist_data->actions[i];
c282a386 4783
7d18a10c
TZ		 4784 if (data->handler == HANDLER_ONMATCH) {
4785 ret = onmatch_create(hist_data, data);
c282a386 4786 if (ret)
7d18a10c 4787 break;
dff81f55
TZ		 4788 } else if (data->handler == HANDLER_ONMAX ||
4789 data->handler == HANDLER_ONCHANGE) {
466f4528 4790 ret = track_data_create(hist_data, data);
50450603 4791 if (ret)
7d18a10c
TZ		 4792 break;
4793 } else {
4794 ret = -EINVAL;
4795 break;
c282a386 4796 }
0212e2aa
TZ		 4797 }
4798
4799 return ret;
4800}
4801
50450603
TZ		 4802static void print_actions(struct seq_file *m,
4803 struct hist_trigger_data *hist_data,
4804 struct tracing_map_elt *elt)
4805{
4806 unsigned int i;
4807
4808 for (i = 0; i < hist_data->n_actions; i++) {
4809 struct action_data *data = hist_data->actions[i];
4810
a3785b7e
TZ		 4811 if (data->action == ACTION_SNAPSHOT)
4812 continue;
4813
dff81f55
TZ		 4814 if (data->handler == HANDLER_ONMAX ||
4815 data->handler == HANDLER_ONCHANGE)
466f4528 4816 track_data_print(m, hist_data, elt, data);
50450603
TZ		 4817 }
4818}
4819
7d18a10c
TZ		 4820static void print_action_spec(struct seq_file *m,
4821 struct hist_trigger_data *hist_data,
4822 struct action_data *data)
4823{
4824 unsigned int i;
4825
4826 if (data->action == ACTION_SAVE) {
4827 for (i = 0; i < hist_data->n_save_vars; i++) {
4828 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4829 if (i < hist_data->n_save_vars - 1)
4830 seq_puts(m, ",");
4831 }
4832 } else if (data->action == ACTION_TRACE) {
e91eefd7
TZ		 4833 if (data->use_trace_keyword)
4834 seq_printf(m, "%s", data->synth_event_name);
7d18a10c 4835 for (i = 0; i < data->n_params; i++) {
e91eefd7 4836 if (i || data->use_trace_keyword)
7d18a10c
TZ		 4837 seq_puts(m, ",");
4838 seq_printf(m, "%s", data->params[i]);
4839 }
4840 }
4841}
4842
466f4528
TZ		 4843static void print_track_data_spec(struct seq_file *m,
4844 struct hist_trigger_data *hist_data,
4845 struct action_data *data)
50450603 4846{
466f4528
TZ		 4847 if (data->handler == HANDLER_ONMAX)
4848 seq_puts(m, ":onmax(");
dff81f55
TZ		 4849 else if (data->handler == HANDLER_ONCHANGE)
4850 seq_puts(m, ":onchange(");
466f4528 4851 seq_printf(m, "%s", data->track_data.var_str);
7d18a10c
TZ		 4852 seq_printf(m, ").%s(", data->action_name);
4853
4854 print_action_spec(m, hist_data, data);
50450603 4855
50450603
TZ		 4856 seq_puts(m, ")");
4857}
4858
c282a386
TZ		 4859static void print_onmatch_spec(struct seq_file *m,
4860 struct hist_trigger_data *hist_data,
4861 struct action_data *data)
4862{
c3e49506
TZ		 4863 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4864 data->match_data.event);
c282a386 4865
7d18a10c 4866 seq_printf(m, "%s(", data->action_name);
c282a386 4867
7d18a10c 4868 print_action_spec(m, hist_data, data);
c282a386
TZ		 4869
4870 seq_puts(m, ")");
4871}
4872
48f79473
TZ		 4873static bool actions_match(struct hist_trigger_data *hist_data,
4874 struct hist_trigger_data *hist_data_test)
4875{
4876 unsigned int i, j;
4877
4878 if (hist_data->n_actions != hist_data_test->n_actions)
4879 return false;
4880
4881 for (i = 0; i < hist_data->n_actions; i++) {
4882 struct action_data *data = hist_data->actions[i];
4883 struct action_data *data_test = hist_data_test->actions[i];
e91eefd7 4884 char *action_name, *action_name_test;
48f79473 4885
7d18a10c
TZ		 4886 if (data->handler != data_test->handler)
4887 return false;
4888 if (data->action != data_test->action)
48f79473
TZ		 4889 return false;
4890
4891 if (data->n_params != data_test->n_params)
4892 return false;
4893
4894 for (j = 0; j < data->n_params; j++) {
4895 if (strcmp(data->params[j], data_test->params[j]) != 0)
4896 return false;
4897 }
4898
e91eefd7
TZ		 4899 if (data->use_trace_keyword)
4900 action_name = data->synth_event_name;
4901 else
4902 action_name = data->action_name;
4903
4904 if (data_test->use_trace_keyword)
4905 action_name_test = data_test->synth_event_name;
4906 else
4907 action_name_test = data_test->action_name;
4908
4909 if (strcmp(action_name, action_name_test) != 0)
7d18a10c
TZ		 4910 return false;
4911
4912 if (data->handler == HANDLER_ONMATCH) {
c3e49506
TZ		 4913 if (strcmp(data->match_data.event_system,
4914 data_test->match_data.event_system) != 0)
48f79473 4915 return false;
c3e49506
TZ		 4916 if (strcmp(data->match_data.event,
4917 data_test->match_data.event) != 0)
48f79473 4918 return false;
dff81f55
TZ		 4919 } else if (data->handler == HANDLER_ONMAX ||
4920 data->handler == HANDLER_ONCHANGE) {
466f4528
TZ		 4921 if (strcmp(data->track_data.var_str,
4922 data_test->track_data.var_str) != 0)
48f79473 4923 return false;
48f79473
TZ		 4924 }
4925 }
4926
4927 return true;
4928}
4929
4930
c282a386
TZ		 4931static void print_actions_spec(struct seq_file *m,
4932 struct hist_trigger_data *hist_data)
4933{
4934 unsigned int i;
4935
4936 for (i = 0; i < hist_data->n_actions; i++) {
4937 struct action_data *data = hist_data->actions[i];
4938
7d18a10c 4939 if (data->handler == HANDLER_ONMATCH)
c282a386 4940 print_onmatch_spec(m, hist_data, data);
dff81f55
TZ		 4941 else if (data->handler == HANDLER_ONMAX ||
4942 data->handler == HANDLER_ONCHANGE)
466f4528 4943 print_track_data_spec(m, hist_data, data);
c282a386
TZ		 4944 }
4945}
4946
02205a67
TZ		 4947static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
4948{
4949 unsigned int i;
4950
4951 for (i = 0; i < hist_data->n_field_var_hists; i++) {
4952 kfree(hist_data->field_var_hists[i]->cmd);
4953 kfree(hist_data->field_var_hists[i]);
4954 }
4955}
4956
7ef224d1
TZ		 4957static void destroy_hist_data(struct hist_trigger_data *hist_data)
4958{
0212e2aa
TZ		 4959 if (!hist_data)
4960 return;
4961
7ef224d1
TZ		 4962 destroy_hist_trigger_attrs(hist_data->attrs);
4963 destroy_hist_fields(hist_data);
4964 tracing_map_destroy(hist_data->map);
0212e2aa
TZ		 4965
4966 destroy_actions(hist_data);
02205a67
TZ		 4967 destroy_field_vars(hist_data);
4968 destroy_field_var_hists(hist_data);
0212e2aa 4969
7ef224d1
TZ		 4970 kfree(hist_data);
4971}
4972
4973static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
4974{
4975 struct tracing_map *map = hist_data->map;
4976 struct ftrace_event_field *field;
4977 struct hist_field *hist_field;
b28d7b2d 4978 int i, idx = 0;
7ef224d1
TZ		 4979
4980 for_each_hist_field(i, hist_data) {
4981 hist_field = hist_data->fields[i];
4982 if (hist_field->flags & HIST_FIELD_FL_KEY) {
4983 tracing_map_cmp_fn_t cmp_fn;
4984
4985 field = hist_field->field;
4986
69a0200c
TZ		 4987 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
4988 cmp_fn = tracing_map_cmp_none;
1d1898f6 4989 else if (!field || hist_field->flags & HIST_FIELD_FL_CPU)
ad42febe
TZ		 4990 cmp_fn = tracing_map_cmp_num(hist_field->size,
4991 hist_field->is_signed);
69a0200c 4992 else if (is_string_field(field))
7ef224d1
TZ		 4993 cmp_fn = tracing_map_cmp_string;
4994 else
4995 cmp_fn = tracing_map_cmp_num(field->size,
4996 field->is_signed);
76a3b0c8
TZ		 4997 idx = tracing_map_add_key_field(map,
4998 hist_field->offset,
4999 cmp_fn);
30350d65 5000 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
7ef224d1
TZ		 5001 idx = tracing_map_add_sum_field(map);
5002
5003 if (idx < 0)
5004 return idx;
30350d65
TZ		 5005
5006 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5007 idx = tracing_map_add_var(map);
5008 if (idx < 0)
5009 return idx;
5010 hist_field->var.idx = idx;
5011 hist_field->var.hist_data = hist_data;
5012 }
7ef224d1
TZ		 5013 }
5014
5015 return 0;
5016}
5017
5018static struct hist_trigger_data *
5019create_hist_data(unsigned int map_bits,
5020 struct hist_trigger_attrs *attrs,
30350d65
TZ		 5021 struct trace_event_file *file,
5022 bool remove)
7ef224d1 5023{
6b4827ad 5024 const struct tracing_map_ops *map_ops = NULL;
7ef224d1
TZ		 5025 struct hist_trigger_data *hist_data;
5026 int ret = 0;
5027
5028 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5029 if (!hist_data)
5030 return ERR_PTR(-ENOMEM);
5031
5032 hist_data->attrs = attrs;
30350d65 5033 hist_data->remove = remove;
067fe038 5034 hist_data->event_file = file;
7ef224d1 5035
0212e2aa
TZ		 5036 ret = parse_actions(hist_data);
5037 if (ret)
5038 goto free;
5039
7ef224d1
TZ		 5040 ret = create_hist_fields(hist_data, file);
5041 if (ret)
5042 goto free;
5043
5044 ret = create_sort_keys(hist_data);
5045 if (ret)
5046 goto free;
5047
af6a29bc 5048 map_ops = &hist_trigger_elt_data_ops;
6b4827ad 5049
7ef224d1 5050 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
6b4827ad 5051 map_ops, hist_data);
7ef224d1
TZ		 5052 if (IS_ERR(hist_data->map)) {
5053 ret = PTR_ERR(hist_data->map);
5054 hist_data->map = NULL;
5055 goto free;
5056 }
5057
5058 ret = create_tracing_map_fields(hist_data);
5059 if (ret)
5060 goto free;
7ef224d1
TZ		 5061 out:
5062 return hist_data;
5063 free:
5064 hist_data->attrs = NULL;
5065
5066 destroy_hist_data(hist_data);
5067
5068 hist_data = ERR_PTR(ret);
5069
5070 goto out;
5071}
5072
5073static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
b47e3302
SRV		 5074 struct tracing_map_elt *elt,
5075 struct trace_buffer *buffer, void *rec,
067fe038
TZ		 5076 struct ring_buffer_event *rbe,
5077 u64 *var_ref_vals)
7ef224d1 5078{
067fe038 5079 struct hist_elt_data *elt_data;
7ef224d1 5080 struct hist_field *hist_field;
30350d65 5081 unsigned int i, var_idx;
7ef224d1
TZ		 5082 u64 hist_val;
5083
067fe038
TZ		 5084 elt_data = elt->private_data;
5085 elt_data->var_ref_vals = var_ref_vals;
5086
7ef224d1
TZ		 5087 for_each_hist_val_field(i, hist_data) {
5088 hist_field = hist_data->fields[i];
86087383 5089 hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
30350d65
TZ		 5090 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5091 var_idx = hist_field->var.idx;
63a1e5de
TZ		 5092
5093 if (hist_field->flags & HIST_FIELD_FL_STRING) {
5094 unsigned int str_start, var_str_idx, idx;
5095 char *str, *val_str;
938aa33f 5096 unsigned int size;
63a1e5de
TZ		 5097
5098 str_start = hist_data->n_field_var_str +
5099 hist_data->n_save_var_str;
5100 var_str_idx = hist_field->var_str_idx;
5101 idx = str_start + var_str_idx;
5102
5103 str = elt_data->field_var_str[idx];
5104 val_str = (char *)(uintptr_t)hist_val;
938aa33f
SRV		 5105
5106 size = min(hist_field->size, STR_VAR_LEN_MAX);
5107 strscpy(str, val_str, size);
63a1e5de
TZ		 5108
5109 hist_val = (u64)(uintptr_t)str;
5110 }
30350d65
TZ		 5111 tracing_map_set_var(elt, var_idx, hist_val);
5112 continue;
5113 }
7ef224d1
TZ		 5114 tracing_map_update_sum(elt, i, hist_val);
5115 }
30350d65
TZ		 5116
5117 for_each_hist_key_field(i, hist_data) {
5118 hist_field = hist_data->fields[i];
5119 if (hist_field->flags & HIST_FIELD_FL_VAR) {
86087383 5120 hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
30350d65
TZ		 5121 var_idx = hist_field->var.idx;
5122 tracing_map_set_var(elt, var_idx, hist_val);
5123 }
5124 }
02205a67 5125
b47e3302 5126 update_field_vars(hist_data, elt, buffer, rbe, rec);
7ef224d1
TZ		 5127}
5128
6a475cb1
TZ		 5129static inline void add_to_key(char *compound_key, void *key,
5130 struct hist_field *key_field, void *rec)
5131{
5132 size_t size = key_field->size;
5133
5134 if (key_field->flags & HIST_FIELD_FL_STRING) {
5135 struct ftrace_event_field *field;
5136
5137 field = key_field->field;
05770dd0
MH		 5138 if (field->filter_type == FILTER_DYN_STRING ||
5139 field->filter_type == FILTER_RDYN_STRING)
6a475cb1 5140 size = *(u32 *)(rec + field->offset) >> 16;
6a475cb1
TZ		 5141 else if (field->filter_type == FILTER_STATIC_STRING)
5142 size = field->size;
5143
5144 /* ensure NULL-termination */
5145 if (size > key_field->size - 1)
5146 size = key_field->size - 1;
6a475cb1 5147
9f0bbf31
TZ		 5148 strncpy(compound_key + key_field->offset, (char *)key, size);
5149 } else
5150 memcpy(compound_key + key_field->offset, key, size);
6a475cb1
TZ		 5151}
5152
0212e2aa
TZ		 5153static void
5154hist_trigger_actions(struct hist_trigger_data *hist_data,
b47e3302
SRV		 5155 struct tracing_map_elt *elt,
5156 struct trace_buffer *buffer, void *rec,
7d18a10c
TZ		 5157 struct ring_buffer_event *rbe, void *key,
5158 u64 *var_ref_vals)
0212e2aa
TZ		 5159{
5160 struct action_data *data;
5161 unsigned int i;
5162
5163 for (i = 0; i < hist_data->n_actions; i++) {
5164 data = hist_data->actions[i];
b47e3302 5165 data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals);
0212e2aa
TZ		 5166 }
5167}
5168
b47e3302
SRV		 5169static void event_hist_trigger(struct event_trigger_data *data,
5170 struct trace_buffer *buffer, void *rec,
fbd302cb 5171 struct ring_buffer_event *rbe)
7ef224d1
TZ		 5172{
5173 struct hist_trigger_data *hist_data = data->private_data;
6a475cb1 5174 bool use_compound_key = (hist_data->n_keys > 1);
69a0200c 5175 unsigned long entries[HIST_STACKTRACE_DEPTH];
067fe038 5176 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
76a3b0c8 5177 char compound_key[HIST_KEY_SIZE_MAX];
df35d93b 5178 struct tracing_map_elt *elt = NULL;
7ef224d1 5179 struct hist_field *key_field;
7ef224d1
TZ		 5180 u64 field_contents;
5181 void *key = NULL;
5182 unsigned int i;
5183
ef38c79a
SRG		 5184 if (unlikely(!rbe))
5185 return;
5186
6a475cb1 5187 memset(compound_key, 0, hist_data->key_size);
76a3b0c8 5188
7ef224d1
TZ		 5189 for_each_hist_key_field(i, hist_data) {
5190 key_field = hist_data->fields[i];
5191
69a0200c 5192 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
e7d91663
TG		 5193 memset(entries, 0, HIST_STACKTRACE_SIZE);
5194 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
5195 HIST_STACKTRACE_SKIP);
69a0200c
TZ		 5196 key = entries;
5197 } else {
86087383 5198 field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec);
6a475cb1 5199 if (key_field->flags & HIST_FIELD_FL_STRING) {
69a0200c 5200 key = (void *)(unsigned long)field_contents;
6a475cb1
TZ		 5201 use_compound_key = true;
5202 } else
69a0200c 5203 key = (void *)&field_contents;
76a3b0c8 5204 }
6a475cb1
TZ		 5205
5206 if (use_compound_key)
5207 add_to_key(compound_key, key, key_field, rec);
7ef224d1
TZ		 5208 }
5209
6a475cb1 5210 if (use_compound_key)
76a3b0c8
TZ		 5211 key = compound_key;
5212
067fe038
TZ		 5213 if (hist_data->n_var_refs &&
5214 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5215 return;
5216
7ef224d1 5217 elt = tracing_map_insert(hist_data->map, key);
067fe038
TZ		 5218 if (!elt)
5219 return;
5220
b47e3302 5221 hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals);
0212e2aa
TZ		 5222
5223 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
b47e3302 5224 hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals);
7ef224d1
TZ		 5225}
5226
69a0200c
TZ		 5227static void hist_trigger_stacktrace_print(struct seq_file *m,
5228 unsigned long *stacktrace_entries,
5229 unsigned int max_entries)
5230{
69a0200c
TZ		 5231 unsigned int spaces = 8;
5232 unsigned int i;
5233
5234 for (i = 0; i < max_entries; i++) {
4285f2fc 5235 if (!stacktrace_entries[i])
69a0200c
TZ		 5236 return;
5237
5238 seq_printf(m, "%*c", 1 + spaces, ' ');
8720aeec 5239 seq_printf(m, "%pS\n", (void*)stacktrace_entries[i]);
69a0200c
TZ		 5240 }
5241}
5242
a3785b7e
TZ		 5243static void hist_trigger_print_key(struct seq_file *m,
5244 struct hist_trigger_data *hist_data,
5245 void *key,
5246 struct tracing_map_elt *elt)
7ef224d1
TZ		 5247{
5248 struct hist_field *key_field;
69a0200c 5249 bool multiline = false;
85013256 5250 const char *field_name;
7ef224d1
TZ		 5251 unsigned int i;
5252 u64 uval;
5253
5254 seq_puts(m, "{ ");
5255
5256 for_each_hist_key_field(i, hist_data) {
5257 key_field = hist_data->fields[i];
5258
5259 if (i > hist_data->n_vals)
5260 seq_puts(m, ", ");
5261
85013256
TZ		 5262 field_name = hist_field_name(key_field, 0);
5263
0c4a6b46
TZ		 5264 if (key_field->flags & HIST_FIELD_FL_HEX) {
5265 uval = *(u64 *)(key + key_field->offset);
85013256 5266 seq_printf(m, "%s: %llx", field_name, uval);
c6afad49
TZ		 5267 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5268 uval = *(u64 *)(key + key_field->offset);
8720aeec
AB		 5269 seq_printf(m, "%s: [%llx] %-45ps", field_name,
5270 uval, (void *)(uintptr_t)uval);
c6afad49
TZ		 5271 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5272 uval = *(u64 *)(key + key_field->offset);
8720aeec
AB		 5273 seq_printf(m, "%s: [%llx] %-55pS", field_name,
5274 uval, (void *)(uintptr_t)uval);
6b4827ad 5275 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
af6a29bc
TZ		 5276 struct hist_elt_data *elt_data = elt->private_data;
5277 char *comm;
5278
5279 if (WARN_ON_ONCE(!elt_data))
5280 return;
5281
5282 comm = elt_data->comm;
6b4827ad
TZ		 5283
5284 uval = *(u64 *)(key + key_field->offset);
85013256
TZ		 5285 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5286 comm, uval);
31696198
TZ		 5287 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5288 const char *syscall_name;
5289
5290 uval = *(u64 *)(key + key_field->offset);
5291 syscall_name = get_syscall_name(uval);
5292 if (!syscall_name)
5293 syscall_name = "unknown_syscall";
5294
85013256
TZ		 5295 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5296 syscall_name, uval);
69a0200c
TZ		 5297 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5298 seq_puts(m, "stacktrace:\n");
5299 hist_trigger_stacktrace_print(m,
5300 key + key_field->offset,
5301 HIST_STACKTRACE_DEPTH);
5302 multiline = true;
4b94f5b7 5303 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
85013256 5304 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4b94f5b7 5305 *(u64 *)(key + key_field->offset));
de9a48a3
SRV		 5306 } else if (key_field->flags & HIST_FIELD_FL_BUCKET) {
5307 unsigned long buckets = key_field->buckets;
5308 uval = *(u64 *)(key + key_field->offset);
5309 seq_printf(m, "%s: ~ %llu-%llu", field_name,
5310 uval, uval + buckets -1);
0c4a6b46 5311 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
85013256 5312 seq_printf(m, "%s: %-50s", field_name,
76a3b0c8 5313 (char *)(key + key_field->offset));
7ef224d1 5314 } else {
76a3b0c8 5315 uval = *(u64 *)(key + key_field->offset);
85013256 5316 seq_printf(m, "%s: %10llu", field_name, uval);
7ef224d1
TZ		 5317 }
5318 }
5319
69a0200c
TZ		 5320 if (!multiline)
5321 seq_puts(m, " ");
5322
5323 seq_puts(m, "}");
a3785b7e
TZ		 5324}
5325
abaa5258
MHG		 5326/* Get the 100 times of the percentage of @val in @total */
5327static inline unsigned int __get_percentage(u64 val, u64 total)
5328{
5329 if (!total)
5330 goto div0;
5331
5332 if (val < (U64_MAX / 10000))
5333 return (unsigned int)div64_ul(val * 10000, total);
5334
5335 total = div64_u64(total, 10000);
5336 if (!total)
5337 goto div0;
5338
5339 return (unsigned int)div64_ul(val, total);
5340div0:
5341 return val ? UINT_MAX : 0;
5342}
5343
a2c54256
MHG		 5344#define BAR_CHAR '#'
5345
5346static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max)
5347{
5348 unsigned int len = __get_percentage(val, max);
5349 int i;
5350
5351 if (len == UINT_MAX) {
5352 snprintf(buf, size, "[ERROR]");
5353 return buf;
5354 }
5355
5356 len = len * size / 10000;
5357 for (i = 0; i < len && i < size; i++)
5358 buf[i] = BAR_CHAR;
5359 while (i < size)
5360 buf[i++] = ' ';
5361 buf[size] = '\0';
5362
5363 return buf;
5364}
5365
5366struct hist_val_stat {
5367 u64 max;
5368 u64 total;
5369};
5370
abaa5258
MHG		 5371static void hist_trigger_print_val(struct seq_file *m, unsigned int idx,
5372 const char *field_name, unsigned long flags,
a2c54256
MHG		 5373 struct hist_val_stat *stats,
5374 struct tracing_map_elt *elt)
abaa5258
MHG		 5375{
5376 u64 val = tracing_map_read_sum(elt, idx);
5377 unsigned int pc;
a2c54256 5378 char bar[21];
abaa5258
MHG		 5379
5380 if (flags & HIST_FIELD_FL_PERCENT) {
a2c54256 5381 pc = __get_percentage(val, stats[idx].total);
abaa5258
MHG		 5382 if (pc == UINT_MAX)
5383 seq_printf(m, " %s (%%):[ERROR]", field_name);
5384 else
5385 seq_printf(m, " %s (%%): %3u.%02u", field_name,
5386 pc / 100, pc % 100);
a2c54256
MHG		 5387 } else if (flags & HIST_FIELD_FL_GRAPH) {
5388 seq_printf(m, " %s: %20s", field_name,
5389 __fill_bar_str(bar, 20, val, stats[idx].max));
abaa5258
MHG		 5390 } else if (flags & HIST_FIELD_FL_HEX) {
5391 seq_printf(m, " %s: %10llx", field_name, val);
5392 } else {
5393 seq_printf(m, " %s: %10llu", field_name, val);
5394 }
5395}
5396
a3785b7e
TZ		 5397static void hist_trigger_entry_print(struct seq_file *m,
5398 struct hist_trigger_data *hist_data,
a2c54256 5399 struct hist_val_stat *stats,
a3785b7e
TZ		 5400 void *key,
5401 struct tracing_map_elt *elt)
5402{
5403 const char *field_name;
abaa5258
MHG		 5404 unsigned int i = HITCOUNT_IDX;
5405 unsigned long flags;
a3785b7e
TZ		 5406
5407 hist_trigger_print_key(m, hist_data, key, elt);
7ef224d1 5408
ccf47f5c
MHG		 5409 /* At first, show the raw hitcount if !nohitcount */
5410 if (!hist_data->attrs->no_hitcount)
5411 hist_trigger_print_val(m, i, "hitcount", 0, stats, elt);
7ef224d1 5412
f2606835 5413 for (i = 1; i < hist_data->n_vals; i++) {
85013256 5414 field_name = hist_field_name(hist_data->fields[i], 0);
abaa5258 5415 flags = hist_data->fields[i]->flags;
abaa5258 5416 if (flags & HIST_FIELD_FL_VAR || flags & HIST_FIELD_FL_EXPR)
30350d65
TZ		 5417 continue;
5418
abaa5258 5419 seq_puts(m, " ");
a2c54256 5420 hist_trigger_print_val(m, i, field_name, flags, stats, elt);
f2606835
TZ		 5421 }
5422
50450603
TZ		 5423 print_actions(m, hist_data, elt);
5424
7ef224d1
TZ		 5425 seq_puts(m, "\n");
5426}
5427
5428static int print_entries(struct seq_file *m,
5429 struct hist_trigger_data *hist_data)
5430{
5431 struct tracing_map_sort_entry **sort_entries = NULL;
5432 struct tracing_map *map = hist_data->map;
abaa5258 5433 int i, j, n_entries;
a2c54256
MHG		 5434 struct hist_val_stat *stats = NULL;
5435 u64 val;
7ef224d1
TZ		 5436
5437 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5438 hist_data->n_sort_keys,
5439 &sort_entries);
5440 if (n_entries < 0)
5441 return n_entries;
5442
a2c54256 5443 /* Calculate the max and the total for each field if needed. */
abaa5258 5444 for (j = 0; j < hist_data->n_vals; j++) {
a2c54256
MHG		 5445 if (!(hist_data->fields[j]->flags &
5446 (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH)))
abaa5258 5447 continue;
a2c54256
MHG		 5448 if (!stats) {
5449 stats = kcalloc(hist_data->n_vals, sizeof(*stats),
5450 GFP_KERNEL);
5451 if (!stats) {
abaa5258
MHG		 5452 n_entries = -ENOMEM;
5453 goto out;
5454 }
5455 }
a2c54256
MHG		 5456 for (i = 0; i < n_entries; i++) {
5457 val = tracing_map_read_sum(sort_entries[i]->elt, j);
5458 stats[j].total += val;
5459 if (stats[j].max < val)
5460 stats[j].max = val;
5461 }
abaa5258
MHG		 5462 }
5463
7ef224d1 5464 for (i = 0; i < n_entries; i++)
a2c54256 5465 hist_trigger_entry_print(m, hist_data, stats,
7ef224d1
TZ		 5466 sort_entries[i]->key,
5467 sort_entries[i]->elt);
5468
a2c54256 5469 kfree(stats);
abaa5258 5470out:
7ef224d1
TZ		 5471 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5472
5473 return n_entries;
5474}
5475
52a7f16d
TZ		 5476static void hist_trigger_show(struct seq_file *m,
5477 struct event_trigger_data *data, int n)
7ef224d1 5478{
7ef224d1 5479 struct hist_trigger_data *hist_data;
6e7a2398 5480 int n_entries;
7ef224d1 5481
52a7f16d
TZ		 5482 if (n > 0)
5483 seq_puts(m, "\n\n");
7ef224d1
TZ		 5484
5485 seq_puts(m, "# event histogram\n#\n# trigger info: ");
47670541 5486 data->ops->print(m, data);
52a7f16d 5487 seq_puts(m, "#\n\n");
7ef224d1
TZ		 5488
5489 hist_data = data->private_data;
5490 n_entries = print_entries(m, hist_data);
6e7a2398 5491 if (n_entries < 0)
7ef224d1 5492 n_entries = 0;
7ef224d1 5493
a3785b7e
TZ		 5494 track_data_snapshot_print(m, hist_data);
5495
7ef224d1
TZ		 5496 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5497 (u64)atomic64_read(&hist_data->map->hits),
5498 n_entries, (u64)atomic64_read(&hist_data->map->drops));
52a7f16d
TZ		 5499}
5500
5501static int hist_show(struct seq_file *m, void *v)
5502{
5503 struct event_trigger_data *data;
5504 struct trace_event_file *event_file;
5505 int n = 0, ret = 0;
5506
5507 mutex_lock(&event_mutex);
5508
5509 event_file = event_file_data(m->private);
5510 if (unlikely(!event_file)) {
5511 ret = -ENODEV;
5512 goto out_unlock;
5513 }
5514
aeed8aa3 5515 list_for_each_entry(data, &event_file->triggers, list) {
52a7f16d
TZ		 5516 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5517 hist_trigger_show(m, data, n++);
5518 }
5519
7ef224d1
TZ		 5520 out_unlock:
5521 mutex_unlock(&event_mutex);
5522
5523 return ret;
5524}
5525
5526static int event_hist_open(struct inode *inode, struct file *file)
5527{
17911ff3
SRV		 5528 int ret;
5529
5530 ret = security_locked_down(LOCKDOWN_TRACEFS);
5531 if (ret)
5532 return ret;
5533
7ef224d1
TZ		 5534 return single_open(file, hist_show, file);
5535}
5536
5537const struct file_operations event_hist_fops = {
5538 .open = event_hist_open,
5539 .read = seq_read,
5540 .llseek = seq_lseek,
5541 .release = single_release,
5542};
5543
2d19bd79
TZ		 5544#ifdef CONFIG_HIST_TRIGGERS_DEBUG
5545static void hist_field_debug_show_flags(struct seq_file *m,
5546 unsigned long flags)
5547{
5548 seq_puts(m, " flags:\n");
5549
5550 if (flags & HIST_FIELD_FL_KEY)
5551 seq_puts(m, " HIST_FIELD_FL_KEY\n");
5552 else if (flags & HIST_FIELD_FL_HITCOUNT)
5553 seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n");
5554 else if (flags & HIST_FIELD_FL_VAR)
5555 seq_puts(m, " HIST_FIELD_FL_VAR\n");
5556 else if (flags & HIST_FIELD_FL_VAR_REF)
5557 seq_puts(m, " HIST_FIELD_FL_VAR_REF\n");
5558 else
5559 seq_puts(m, " VAL: normal u64 value\n");
5560
5561 if (flags & HIST_FIELD_FL_ALIAS)
5562 seq_puts(m, " HIST_FIELD_FL_ALIAS\n");
52cfb373
KS		 5563 else if (flags & HIST_FIELD_FL_CONST)
5564 seq_puts(m, " HIST_FIELD_FL_CONST\n");
2d19bd79
TZ		 5565}
5566
5567static int hist_field_debug_show(struct seq_file *m,
5568 struct hist_field *field, unsigned long flags)
5569{
5570 if ((field->flags & flags) != flags) {
5571 seq_printf(m, "ERROR: bad flags - %lx\n", flags);
5572 return -EINVAL;
5573 }
5574
5575 hist_field_debug_show_flags(m, field->flags);
5576 if (field->field)
5577 seq_printf(m, " ftrace_event_field name: %s\n",
5578 field->field->name);
5579
5580 if (field->flags & HIST_FIELD_FL_VAR) {
5581 seq_printf(m, " var.name: %s\n", field->var.name);
5582 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5583 field->var.idx);
5584 }
5585
52cfb373
KS		 5586 if (field->flags & HIST_FIELD_FL_CONST)
5587 seq_printf(m, " constant: %llu\n", field->constant);
5588
2d19bd79
TZ		 5589 if (field->flags & HIST_FIELD_FL_ALIAS)
5590 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
5591 field->var_ref_idx);
5592
5593 if (field->flags & HIST_FIELD_FL_VAR_REF) {
5594 seq_printf(m, " name: %s\n", field->name);
5595 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5596 field->var.idx);
5597 seq_printf(m, " var.hist_data: %p\n", field->var.hist_data);
5598 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
5599 field->var_ref_idx);
5600 if (field->system)
5601 seq_printf(m, " system: %s\n", field->system);
5602 if (field->event_name)
5603 seq_printf(m, " event_name: %s\n", field->event_name);
5604 }
5605
5606 seq_printf(m, " type: %s\n", field->type);
5607 seq_printf(m, " size: %u\n", field->size);
5608 seq_printf(m, " is_signed: %u\n", field->is_signed);
5609
5610 return 0;
5611}
5612
5613static int field_var_debug_show(struct seq_file *m,
5614 struct field_var *field_var, unsigned int i,
5615 bool save_vars)
5616{
5617 const char *vars_name = save_vars ? "save_vars" : "field_vars";
5618 struct hist_field *field;
5619 int ret = 0;
5620
5621 seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i);
5622
5623 field = field_var->var;
5624
5625 seq_printf(m, "\n %s[%d].var:\n", vars_name, i);
5626
5627 hist_field_debug_show_flags(m, field->flags);
5628 seq_printf(m, " var.name: %s\n", field->var.name);
5629 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5630 field->var.idx);
5631
5632 field = field_var->val;
5633
5634 seq_printf(m, "\n %s[%d].val:\n", vars_name, i);
5635 if (field->field)
5636 seq_printf(m, " ftrace_event_field name: %s\n",
5637 field->field->name);
5638 else {
5639 ret = -EINVAL;
5640 goto out;
5641 }
5642
5643 seq_printf(m, " type: %s\n", field->type);
5644 seq_printf(m, " size: %u\n", field->size);
5645 seq_printf(m, " is_signed: %u\n", field->is_signed);
5646out:
5647 return ret;
5648}
5649
5650static int hist_action_debug_show(struct seq_file *m,
5651 struct action_data *data, int i)
5652{
5653 int ret = 0;
5654
5655 if (data->handler == HANDLER_ONMAX ||
5656 data->handler == HANDLER_ONCHANGE) {
5657 seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i);
5658 ret = hist_field_debug_show(m, data->track_data.var_ref,
5659 HIST_FIELD_FL_VAR_REF);
5660 if (ret)
5661 goto out;
5662
5663 seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i);
5664 ret = hist_field_debug_show(m, data->track_data.track_var,
5665 HIST_FIELD_FL_VAR);
5666 if (ret)
5667 goto out;
5668 }
5669
5670 if (data->handler == HANDLER_ONMATCH) {
5671 seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n",
5672 i, data->match_data.event_system);
5673 seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n",
5674 i, data->match_data.event);
5675 }
5676out:
5677 return ret;
5678}
5679
5680static int hist_actions_debug_show(struct seq_file *m,
5681 struct hist_trigger_data *hist_data)
5682{
5683 int i, ret = 0;
5684
5685 if (hist_data->n_actions)
5686 seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n");
5687
5688 for (i = 0; i < hist_data->n_actions; i++) {
5689 struct action_data *action = hist_data->actions[i];
5690
5691 ret = hist_action_debug_show(m, action, i);
5692 if (ret)
5693 goto out;
5694 }
5695
5696 if (hist_data->n_save_vars)
5697 seq_puts(m, "\n save action variables (save() params):\n");
5698
5699 for (i = 0; i < hist_data->n_save_vars; i++) {
5700 ret = field_var_debug_show(m, hist_data->save_vars[i], i, true);
5701 if (ret)
5702 goto out;
5703 }
5704out:
5705 return ret;
5706}
5707
5708static void hist_trigger_debug_show(struct seq_file *m,
5709 struct event_trigger_data *data, int n)
5710{
5711 struct hist_trigger_data *hist_data;
5712 int i, ret;
5713
5714 if (n > 0)
5715 seq_puts(m, "\n\n");
5716
5717 seq_puts(m, "# event histogram\n#\n# trigger info: ");
47670541 5718 data->ops->print(m, data);
2d19bd79
TZ		 5719 seq_puts(m, "#\n\n");
5720
5721 hist_data = data->private_data;
5722
5723 seq_printf(m, "hist_data: %p\n\n", hist_data);
5724 seq_printf(m, " n_vals: %u\n", hist_data->n_vals);
5725 seq_printf(m, " n_keys: %u\n", hist_data->n_keys);
5726 seq_printf(m, " n_fields: %u\n", hist_data->n_fields);
5727
5728 seq_puts(m, "\n val fields:\n\n");
5729
5730 seq_puts(m, " hist_data->fields[0]:\n");
5731 ret = hist_field_debug_show(m, hist_data->fields[0],
5732 HIST_FIELD_FL_HITCOUNT);
5733 if (ret)
5734 return;
5735
5736 for (i = 1; i < hist_data->n_vals; i++) {
5737 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5738 ret = hist_field_debug_show(m, hist_data->fields[i], 0);
5739 if (ret)
5740 return;
5741 }
5742
5743 seq_puts(m, "\n key fields:\n");
5744
5745 for (i = hist_data->n_vals; i < hist_data->n_fields; i++) {
5746 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5747 ret = hist_field_debug_show(m, hist_data->fields[i],
5748 HIST_FIELD_FL_KEY);
5749 if (ret)
5750 return;
5751 }
5752
5753 if (hist_data->n_var_refs)
5754 seq_puts(m, "\n variable reference fields:\n");
5755
5756 for (i = 0; i < hist_data->n_var_refs; i++) {
5757 seq_printf(m, "\n hist_data->var_refs[%d]:\n", i);
5758 ret = hist_field_debug_show(m, hist_data->var_refs[i],
5759 HIST_FIELD_FL_VAR_REF);
5760 if (ret)
5761 return;
5762 }
5763
5764 if (hist_data->n_field_vars)
5765 seq_puts(m, "\n field variables:\n");
5766
5767 for (i = 0; i < hist_data->n_field_vars; i++) {
5768 ret = field_var_debug_show(m, hist_data->field_vars[i], i, false);
5769 if (ret)
5770 return;
5771 }
5772
5773 ret = hist_actions_debug_show(m, hist_data);
5774 if (ret)
5775 return;
5776}
5777
5778static int hist_debug_show(struct seq_file *m, void *v)
5779{
5780 struct event_trigger_data *data;
5781 struct trace_event_file *event_file;
5782 int n = 0, ret = 0;
5783
5784 mutex_lock(&event_mutex);
5785
5786 event_file = event_file_data(m->private);
5787 if (unlikely(!event_file)) {
5788 ret = -ENODEV;
5789 goto out_unlock;
5790 }
5791
5792 list_for_each_entry(data, &event_file->triggers, list) {
5793 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5794 hist_trigger_debug_show(m, data, n++);
5795 }
5796
5797 out_unlock:
5798 mutex_unlock(&event_mutex);
5799
5800 return ret;
5801}
5802
5803static int event_hist_debug_open(struct inode *inode, struct file *file)
5804{
5805 int ret;
5806
5807 ret = security_locked_down(LOCKDOWN_TRACEFS);
5808 if (ret)
5809 return ret;
5810
5811 return single_open(file, hist_debug_show, file);
5812}
5813
5814const struct file_operations event_hist_debug_fops = {
5815 .open = event_hist_debug_open,
5816 .read = seq_read,
5817 .llseek = seq_lseek,
5818 .release = single_release,
5819};
5820#endif
5821
7ef224d1
TZ		 5822static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5823{
85013256
TZ		 5824 const char *field_name = hist_field_name(hist_field, 0);
5825
30350d65
TZ		 5826 if (hist_field->var.name)
5827 seq_printf(m, "%s=", hist_field->var.name);
5828
0ae7961e 5829 if (hist_field->flags & HIST_FIELD_FL_CPU)
1e3bac71 5830 seq_puts(m, "common_cpu");
52cfb373
KS		 5831 else if (hist_field->flags & HIST_FIELD_FL_CONST)
5832 seq_printf(m, "%llu", hist_field->constant);
067fe038 5833 else if (field_name) {
7e8b88a3
TZ		 5834 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5835 hist_field->flags & HIST_FIELD_FL_ALIAS)
067fe038 5836 seq_putc(m, '$');
ad42febe 5837 seq_printf(m, "%s", field_name);
0ae7961e
TZ		 5838 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5839 seq_puts(m, "common_timestamp");
608940da
TZ		 5840
5841 if (hist_field->flags) {
5842 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5843 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5844 const char *flags = get_hist_field_flags(hist_field);
5845
5846 if (flags)
5847 seq_printf(m, ".%s", flags);
5848 }
5849 }
de9a48a3
SRV		 5850 if (hist_field->buckets)
5851 seq_printf(m, "=%ld", hist_field->buckets);
7ef224d1
TZ		 5852}
5853
5854static int event_hist_trigger_print(struct seq_file *m,
7ef224d1
TZ		 5855 struct event_trigger_data *data)
5856{
5857 struct hist_trigger_data *hist_data = data->private_data;
30350d65
TZ		 5858 struct hist_field *field;
5859 bool have_var = false;
ccf47f5c 5860 bool show_val = false;
7ef224d1
TZ		 5861 unsigned int i;
5862
edfeed31 5863 seq_puts(m, HIST_PREFIX);
5463bfda
TZ		 5864
5865 if (data->name)
5866 seq_printf(m, "%s:", data->name);
5867
5868 seq_puts(m, "keys=");
7ef224d1
TZ		 5869
5870 for_each_hist_key_field(i, hist_data) {
30350d65 5871 field = hist_data->fields[i];
7ef224d1
TZ		 5872
5873 if (i > hist_data->n_vals)
5874 seq_puts(m, ",");
5875
30350d65 5876 if (field->flags & HIST_FIELD_FL_STACKTRACE)
69a0200c
TZ		 5877 seq_puts(m, "stacktrace");
5878 else
30350d65 5879 hist_field_print(m, field);
7ef224d1
TZ		 5880 }
5881
5882 seq_puts(m, ":vals=");
f2606835
TZ		 5883
5884 for_each_hist_val_field(i, hist_data) {
30350d65
TZ		 5885 field = hist_data->fields[i];
5886 if (field->flags & HIST_FIELD_FL_VAR) {
5887 have_var = true;
5888 continue;
5889 }
5890
ccf47f5c
MHG		 5891 if (i == HITCOUNT_IDX) {
5892 if (hist_data->attrs->no_hitcount)
5893 continue;
f2606835 5894 seq_puts(m, "hitcount");
ccf47f5c
MHG		 5895 } else {
5896 if (show_val)
5897 seq_puts(m, ",");
30350d65
TZ		 5898 hist_field_print(m, field);
5899 }
ccf47f5c 5900 show_val = true;
30350d65
TZ		 5901 }
5902
5903 if (have_var) {
5904 unsigned int n = 0;
5905
5906 seq_puts(m, ":");
5907
5908 for_each_hist_val_field(i, hist_data) {
5909 field = hist_data->fields[i];
5910
5911 if (field->flags & HIST_FIELD_FL_VAR) {
5912 if (n++)
5913 seq_puts(m, ",");
5914 hist_field_print(m, field);
5915 }
f2606835
TZ		 5916 }
5917 }
7ef224d1
TZ		 5918
5919 seq_puts(m, ":sort=");
e62347d2
TZ		 5920
5921 for (i = 0; i < hist_data->n_sort_keys; i++) {
5922 struct tracing_map_sort_key *sort_key;
30350d65
TZ		 5923 unsigned int idx, first_key_idx;
5924
5925 /* skip VAR vals */
5926 first_key_idx = hist_data->n_vals - hist_data->n_vars;
e62347d2
TZ		 5927
5928 sort_key = &hist_data->sort_keys[i];
ad42febe
TZ		 5929 idx = sort_key->field_idx;
5930
1a361dfc 5931 if (WARN_ON(idx >= HIST_FIELDS_MAX))
ad42febe 5932 return -EINVAL;
e62347d2
TZ		 5933
5934 if (i > 0)
5935 seq_puts(m, ",");
5936
ad42febe 5937 if (idx == HITCOUNT_IDX)
e62347d2 5938 seq_puts(m, "hitcount");
30350d65
TZ		 5939 else {
5940 if (idx >= first_key_idx)
5941 idx += hist_data->n_vars;
e62347d2 5942 hist_field_print(m, hist_data->fields[idx]);
30350d65 5943 }
e62347d2
TZ		 5944
5945 if (sort_key->descending)
5946 seq_puts(m, ".descending");
5947 }
7ef224d1 5948 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
a4072fe8
TZ		 5949 if (hist_data->enable_timestamps)
5950 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
ccf47f5c
MHG		 5951 if (hist_data->attrs->no_hitcount)
5952 seq_puts(m, ":nohitcount");
7ef224d1 5953
c282a386
TZ		 5954 print_actions_spec(m, hist_data);
5955
7ef224d1
TZ		 5956 if (data->filter_str)
5957 seq_printf(m, " if %s", data->filter_str);
5958
83e99914
TZ		 5959 if (data->paused)
5960 seq_puts(m, " [paused]");
5961 else
5962 seq_puts(m, " [active]");
7ef224d1
TZ		 5963
5964 seq_putc(m, '\n');
5965
5966 return 0;
5967}
5968
47670541 5969static int event_hist_trigger_init(struct event_trigger_data *data)
5463bfda
TZ		 5970{
5971 struct hist_trigger_data *hist_data = data->private_data;
5972
5973 if (!data->ref && hist_data->attrs->name)
5974 save_named_trigger(hist_data->attrs->name, data);
5975
5976 data->ref++;
5977
5978 return 0;
5979}
5980
02205a67
TZ		 5981static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5982{
5983 struct trace_event_file *file;
5984 unsigned int i;
5985 char *cmd;
5986 int ret;
5987
5988 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5989 file = hist_data->field_var_hists[i]->hist_data->event_file;
5990 cmd = hist_data->field_var_hists[i]->cmd;
9ec5a7d1
TZ		 5991 ret = event_hist_trigger_parse(&trigger_hist_cmd, file,
5992 "!hist", "hist", cmd);
6c610dba 5993 WARN_ON_ONCE(ret < 0);
02205a67
TZ		 5994 }
5995}
5996
47670541 5997static void event_hist_trigger_free(struct event_trigger_data *data)
7ef224d1
TZ		 5998{
5999 struct hist_trigger_data *hist_data = data->private_data;
6000
6001 if (WARN_ON_ONCE(data->ref <= 0))
6002 return;
6003
6004 data->ref--;
6005 if (!data->ref) {
5463bfda
TZ		 6006 if (data->name)
6007 del_named_trigger(data);
067fe038 6008
7ef224d1 6009 trigger_data_free(data);
067fe038
TZ		 6010
6011 remove_hist_vars(hist_data);
6012
02205a67
TZ		 6013 unregister_field_var_hists(hist_data);
6014
7ef224d1
TZ		 6015 destroy_hist_data(hist_data);
6016 }
6017}
6018
6019static struct event_trigger_ops event_hist_trigger_ops = {
fb339e53 6020 .trigger = event_hist_trigger,
7ef224d1 6021 .print = event_hist_trigger_print,
5463bfda 6022 .init = event_hist_trigger_init,
7ef224d1
TZ		 6023 .free = event_hist_trigger_free,
6024};
6025
47670541 6026static int event_hist_trigger_named_init(struct event_trigger_data *data)
5463bfda
TZ		 6027{
6028 data->ref++;
6029
6030 save_named_trigger(data->named_data->name, data);
6031
47670541 6032 event_hist_trigger_init(data->named_data);
5463bfda
TZ		 6033
6034 return 0;
6035}
6036
47670541 6037static void event_hist_trigger_named_free(struct event_trigger_data *data)
5463bfda
TZ		 6038{
6039 if (WARN_ON_ONCE(data->ref <= 0))
6040 return;
6041
47670541 6042 event_hist_trigger_free(data->named_data);
5463bfda
TZ		 6043
6044 data->ref--;
6045 if (!data->ref) {
6046 del_named_trigger(data);
6047 trigger_data_free(data);
6048 }
6049}
6050
6051static struct event_trigger_ops event_hist_trigger_named_ops = {
fb339e53 6052 .trigger = event_hist_trigger,
5463bfda
TZ		 6053 .print = event_hist_trigger_print,
6054 .init = event_hist_trigger_named_init,
6055 .free = event_hist_trigger_named_free,
6056};
6057
7ef224d1
TZ		 6058static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
6059 char *param)
6060{
6061 return &event_hist_trigger_ops;
6062}
6063
e86ae9ba
TZ		 6064static void hist_clear(struct event_trigger_data *data)
6065{
6066 struct hist_trigger_data *hist_data = data->private_data;
e86ae9ba 6067
5463bfda
TZ		 6068 if (data->name)
6069 pause_named_trigger(data);
e86ae9ba 6070
e0a568dc 6071 tracepoint_synchronize_unregister();
e86ae9ba
TZ		 6072
6073 tracing_map_clear(hist_data->map);
6074
5463bfda
TZ		 6075 if (data->name)
6076 unpause_named_trigger(data);
6077}
6078
6079static bool compatible_field(struct ftrace_event_field *field,
6080 struct ftrace_event_field *test_field)
6081{
6082 if (field == test_field)
6083 return true;
6084 if (field == NULL || test_field == NULL)
6085 return false;
6086 if (strcmp(field->name, test_field->name) != 0)
6087 return false;
6088 if (strcmp(field->type, test_field->type) != 0)
6089 return false;
6090 if (field->size != test_field->size)
6091 return false;
6092 if (field->is_signed != test_field->is_signed)
6093 return false;
6094
6095 return true;
e86ae9ba
TZ		 6096}
6097
52a7f16d 6098static bool hist_trigger_match(struct event_trigger_data *data,
5463bfda
TZ		 6099 struct event_trigger_data *data_test,
6100 struct event_trigger_data *named_data,
6101 bool ignore_filter)
52a7f16d
TZ		 6102{
6103 struct tracing_map_sort_key *sort_key, *sort_key_test;
6104 struct hist_trigger_data *hist_data, *hist_data_test;
6105 struct hist_field *key_field, *key_field_test;
6106 unsigned int i;
6107
5463bfda
TZ		 6108 if (named_data && (named_data != data_test) &&
6109 (named_data != data_test->named_data))
6110 return false;
6111
6112 if (!named_data && is_named_trigger(data_test))
6113 return false;
6114
52a7f16d
TZ		 6115 hist_data = data->private_data;
6116 hist_data_test = data_test->private_data;
6117
6118 if (hist_data->n_vals != hist_data_test->n_vals ||
6119 hist_data->n_fields != hist_data_test->n_fields ||
6120 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
6121 return false;
6122
5463bfda
TZ		 6123 if (!ignore_filter) {
6124 if ((data->filter_str && !data_test->filter_str) ||
6125 (!data->filter_str && data_test->filter_str))
6126 return false;
6127 }
52a7f16d
TZ		 6128
6129 for_each_hist_field(i, hist_data) {
6130 key_field = hist_data->fields[i];
6131 key_field_test = hist_data_test->fields[i];
6132
6133 if (key_field->flags != key_field_test->flags)
6134 return false;
5463bfda 6135 if (!compatible_field(key_field->field, key_field_test->field))
52a7f16d
TZ		 6136 return false;
6137 if (key_field->offset != key_field_test->offset)
6138 return false;
ad42febe
TZ		 6139 if (key_field->size != key_field_test->size)
6140 return false;
6141 if (key_field->is_signed != key_field_test->is_signed)
6142 return false;
1a361dfc
TZ		 6143 if (!!key_field->var.name != !!key_field_test->var.name)
6144 return false;
6145 if (key_field->var.name &&
6146 strcmp(key_field->var.name, key_field_test->var.name) != 0)
6147 return false;
52a7f16d
TZ		 6148 }
6149
6150 for (i = 0; i < hist_data->n_sort_keys; i++) {
6151 sort_key = &hist_data->sort_keys[i];
6152 sort_key_test = &hist_data_test->sort_keys[i];
6153
6154 if (sort_key->field_idx != sort_key_test->field_idx ||
6155 sort_key->descending != sort_key_test->descending)
6156 return false;
6157 }
6158
5463bfda 6159 if (!ignore_filter && data->filter_str &&
52a7f16d
TZ		 6160 (strcmp(data->filter_str, data_test->filter_str) != 0))
6161 return false;
6162
48f79473
TZ		 6163 if (!actions_match(hist_data, hist_data_test))
6164 return false;
6165
52a7f16d
TZ		 6166 return true;
6167}
6168
a7e6b7dc
TZ		 6169static bool existing_hist_update_only(char *glob,
6170 struct event_trigger_data *data,
6171 struct trace_event_file *file)
6172{
6173 struct hist_trigger_data *hist_data = data->private_data;
6174 struct event_trigger_data *test, *named_data = NULL;
6175 bool updated = false;
6176
6177 if (!hist_data->attrs->pause && !hist_data->attrs->cont &&
6178 !hist_data->attrs->clear)
6179 goto out;
6180
6181 if (hist_data->attrs->name) {
6182 named_data = find_named_trigger(hist_data->attrs->name);
6183 if (named_data) {
6184 if (!hist_trigger_match(data, named_data, named_data,
6185 true))
6186 goto out;
6187 }
6188 }
6189
6190 if (hist_data->attrs->name && !named_data)
6191 goto out;
6192
6193 list_for_each_entry(test, &file->triggers, list) {
6194 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6195 if (!hist_trigger_match(data, test, named_data, false))
6196 continue;
6197 if (hist_data->attrs->pause)
6198 test->paused = true;
6199 else if (hist_data->attrs->cont)
6200 test->paused = false;
6201 else if (hist_data->attrs->clear)
6202 hist_clear(test);
6203 updated = true;
6204 goto out;
6205 }
6206 }
6207 out:
6208 return updated;
6209}
6210
2378a2d6 6211static int hist_register_trigger(char *glob,
7ef224d1
TZ		 6212 struct event_trigger_data *data,
6213 struct trace_event_file *file)
6214{
83e99914 6215 struct hist_trigger_data *hist_data = data->private_data;
5463bfda 6216 struct event_trigger_data *test, *named_data = NULL;
d0cd871b 6217 struct trace_array *tr = file->tr;
7ef224d1
TZ		 6218 int ret = 0;
6219
5463bfda
TZ		 6220 if (hist_data->attrs->name) {
6221 named_data = find_named_trigger(hist_data->attrs->name);
6222 if (named_data) {
6223 if (!hist_trigger_match(data, named_data, named_data,
6224 true)) {
d0cd871b 6225 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5463bfda
TZ		 6226 ret = -EINVAL;
6227 goto out;
6228 }
6229 }
6230 }
6231
6232 if (hist_data->attrs->name && !named_data)
6233 goto new;
6234
aeed8aa3
MH		 6235 lockdep_assert_held(&event_mutex);
6236
6237 list_for_each_entry(test, &file->triggers, list) {
7ef224d1 6238 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
a7e6b7dc 6239 if (hist_trigger_match(data, test, named_data, false)) {
d0cd871b 6240 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
83e99914 6241 ret = -EEXIST;
a7e6b7dc 6242 goto out;
f404da6e 6243 }
7ef224d1
TZ		 6244 }
6245 }
5463bfda 6246 new:
e86ae9ba 6247 if (hist_data->attrs->cont || hist_data->attrs->clear) {
d0cd871b 6248 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
83e99914
TZ		 6249 ret = -ENOENT;
6250 goto out;
6251 }
6252
7522c03a
TZ		 6253 if (hist_data->attrs->pause)
6254 data->paused = true;
6255
5463bfda 6256 if (named_data) {
5463bfda
TZ		 6257 data->private_data = named_data->private_data;
6258 set_named_trigger_data(data, named_data);
6259 data->ops = &event_hist_trigger_named_ops;
6260 }
6261
7ef224d1 6262 if (data->ops->init) {
47670541 6263 ret = data->ops->init(data);
7ef224d1
TZ		 6264 if (ret < 0)
6265 goto out;
6266 }
6267
a4072fe8
TZ		 6268 if (hist_data->enable_timestamps) {
6269 char *clock = hist_data->attrs->clock;
6270
6271 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
6272 if (ret) {
d0cd871b 6273 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
a4072fe8
TZ		 6274 goto out;
6275 }
7ef224d1 6276
b94bc80d 6277 tracing_set_filter_buffering(file->tr, true);
a4072fe8
TZ		 6278 }
6279
6280 if (named_data)
6281 destroy_hist_data(hist_data);
067fe038
TZ		 6282 out:
6283 return ret;
6284}
6285
6286static int hist_trigger_enable(struct event_trigger_data *data,
6287 struct trace_event_file *file)
6288{
6289 int ret = 0;
6290
6291 list_add_tail_rcu(&data->list, &file->triggers);
6292
6293 update_cond_flag(file);
ad42febe 6294
7ef224d1
TZ		 6295 if (trace_event_trigger_enable_disable(file, 1) < 0) {
6296 list_del_rcu(&data->list);
6297 update_cond_flag(file);
6298 ret--;
6299 }
067fe038 6300
7ef224d1
TZ		 6301 return ret;
6302}
6303
4b147936
TZ		 6304static bool have_hist_trigger_match(struct event_trigger_data *data,
6305 struct trace_event_file *file)
6306{
6307 struct hist_trigger_data *hist_data = data->private_data;
6308 struct event_trigger_data *test, *named_data = NULL;
6309 bool match = false;
6310
aeed8aa3
MH		 6311 lockdep_assert_held(&event_mutex);
6312
4b147936
TZ		 6313 if (hist_data->attrs->name)
6314 named_data = find_named_trigger(hist_data->attrs->name);
6315
aeed8aa3 6316 list_for_each_entry(test, &file->triggers, list) {
4b147936
TZ		 6317 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6318 if (hist_trigger_match(data, test, named_data, false)) {
6319 match = true;
6320 break;
6321 }
6322 }
6323 }
6324
6325 return match;
6326}
6327
067fe038
TZ		 6328static bool hist_trigger_check_refs(struct event_trigger_data *data,
6329 struct trace_event_file *file)
6330{
6331 struct hist_trigger_data *hist_data = data->private_data;
6332 struct event_trigger_data *test, *named_data = NULL;
6333
aeed8aa3
MH		 6334 lockdep_assert_held(&event_mutex);
6335
067fe038
TZ		 6336 if (hist_data->attrs->name)
6337 named_data = find_named_trigger(hist_data->attrs->name);
6338
aeed8aa3 6339 list_for_each_entry(test, &file->triggers, list) {
067fe038
TZ		 6340 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6341 if (!hist_trigger_match(data, test, named_data, false))
6342 continue;
6343 hist_data = test->private_data;
6344 if (check_var_refs(hist_data))
6345 return true;
6346 break;
6347 }
6348 }
6349
6350 return false;
6351}
6352
2378a2d6 6353static void hist_unregister_trigger(char *glob,
52a7f16d
TZ		 6354 struct event_trigger_data *data,
6355 struct trace_event_file *file)
6356{
45e333ce 6357 struct event_trigger_data *test = NULL, *iter, *named_data = NULL;
5463bfda 6358 struct hist_trigger_data *hist_data = data->private_data;
52a7f16d 6359
aeed8aa3
MH		 6360 lockdep_assert_held(&event_mutex);
6361
5463bfda
TZ		 6362 if (hist_data->attrs->name)
6363 named_data = find_named_trigger(hist_data->attrs->name);
6364
45e333ce
JK		 6365 list_for_each_entry(iter, &file->triggers, list) {
6366 if (iter->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6367 if (!hist_trigger_match(data, iter, named_data, false))
52a7f16d 6368 continue;
45e333ce 6369 test = iter;
52a7f16d
TZ		 6370 list_del_rcu(&test->list);
6371 trace_event_trigger_enable_disable(file, 0);
6372 update_cond_flag(file);
6373 break;
6374 }
6375 }
6376
45e333ce 6377 if (test && test->ops->free)
47670541 6378 test->ops->free(test);
ad42febe
TZ		 6379
6380 if (hist_data->enable_timestamps) {
45e333ce 6381 if (!hist_data->remove || test)
b94bc80d 6382 tracing_set_filter_buffering(file->tr, false);
ad42febe 6383 }
52a7f16d
TZ		 6384}
6385
067fe038
TZ		 6386static bool hist_file_check_refs(struct trace_event_file *file)
6387{
6388 struct hist_trigger_data *hist_data;
6389 struct event_trigger_data *test;
6390
aeed8aa3
MH		 6391 lockdep_assert_held(&event_mutex);
6392
6393 list_for_each_entry(test, &file->triggers, list) {
067fe038
TZ		 6394 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6395 hist_data = test->private_data;
6396 if (check_var_refs(hist_data))
6397 return true;
6398 }
6399 }
6400
6401 return false;
6402}
6403
52a7f16d
TZ		 6404static void hist_unreg_all(struct trace_event_file *file)
6405{
47c18569 6406 struct event_trigger_data *test, *n;
ad42febe 6407 struct hist_trigger_data *hist_data;
4b147936
TZ		 6408 struct synth_event *se;
6409 const char *se_name;
52a7f16d 6410
0e2b81f7
MH		 6411 lockdep_assert_held(&event_mutex);
6412
067fe038
TZ		 6413 if (hist_file_check_refs(file))
6414 return;
6415
47c18569 6416 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d 6417 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
ad42febe 6418 hist_data = test->private_data;
52a7f16d
TZ		 6419 list_del_rcu(&test->list);
6420 trace_event_trigger_enable_disable(file, 0);
4b147936 6421
4b147936
TZ		 6422 se_name = trace_event_name(file->event_call);
6423 se = find_synth_event(se_name);
6424 if (se)
6425 se->ref--;
4b147936 6426
52a7f16d 6427 update_cond_flag(file);
ad42febe 6428 if (hist_data->enable_timestamps)
b94bc80d 6429 tracing_set_filter_buffering(file->tr, false);
52a7f16d 6430 if (test->ops->free)
47670541 6431 test->ops->free(test);
52a7f16d
TZ		 6432 }
6433 }
6434}
6435
9ec5a7d1
TZ		 6436static int event_hist_trigger_parse(struct event_command *cmd_ops,
6437 struct trace_event_file *file,
e1f187d0
TZ		 6438 char *glob, char *cmd,
6439 char *param_and_filter)
7ef224d1
TZ		 6440{
6441 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6442 struct event_trigger_data *trigger_data;
6443 struct hist_trigger_attrs *attrs;
7ef224d1 6444 struct hist_trigger_data *hist_data;
e1f187d0 6445 char *param, *filter, *p, *start;
4b147936
TZ		 6446 struct synth_event *se;
6447 const char *se_name;
e1f187d0 6448 bool remove;
7ef224d1
TZ		 6449 int ret = 0;
6450
0e2b81f7
MH		 6451 lockdep_assert_held(&event_mutex);
6452
97a5d2e5
AF		 6453 if (WARN_ON(!glob))
6454 return -EINVAL;
798a5b6c 6455
69686fcb 6456 if (glob[0]) {
f404da6e 6457 hist_err_clear();
e1f187d0 6458 last_cmd_set(file, param_and_filter);
f404da6e
TZ		 6459 }
6460
e1f187d0 6461 remove = event_trigger_check_remove(glob);
7ef224d1 6462
e1f187d0
TZ		 6463 if (event_trigger_empty_param(param_and_filter))
6464 return -EINVAL;
30350d65 6465
ec5ce098
TZ		 6466 /*
6467 * separate the trigger from the filter (k:v [if filter])
6468 * allowing for whitespace in the trigger
6469 */
e1f187d0 6470 p = param = param_and_filter;
ec5ce098
TZ		 6471 do {
6472 p = strstr(p, "if");
6473 if (!p)
6474 break;
e1f187d0 6475 if (p == param_and_filter)
ec5ce098
TZ		 6476 return -EINVAL;
6477 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6478 p++;
6479 continue;
6480 }
e1f187d0 6481 if (p >= param_and_filter + strlen(param_and_filter) - (sizeof("if") - 1) - 1)
ec5ce098 6482 return -EINVAL;
2f31ed93 6483 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
ec5ce098
TZ		 6484 p++;
6485 continue;
6486 }
6487 break;
b59f2f2b 6488 } while (1);
ec5ce098
TZ		 6489
6490 if (!p)
e1f187d0 6491 filter = NULL;
ec5ce098
TZ		 6492 else {
6493 *(p - 1) = '\0';
e1f187d0
TZ		 6494 filter = strstrip(p);
6495 param = strstrip(param);
ec5ce098 6496 }
7ef224d1 6497
c5eac6ee
KS		 6498 /*
6499 * To simplify arithmetic expression parsing, replace occurrences of
6500 * '.sym-offset' modifier with '.symXoffset'
6501 */
e1f187d0 6502 start = strstr(param, ".sym-offset");
c5eac6ee
KS		 6503 while (start) {
6504 *(start + 4) = 'X';
6505 start = strstr(start + 11, ".sym-offset");
feea69ec 6506 }
c5eac6ee 6507
e1f187d0 6508 attrs = parse_hist_trigger_attrs(file->tr, param);
7ef224d1
TZ		 6509 if (IS_ERR(attrs))
6510 return PTR_ERR(attrs);
6511
6512 if (attrs->map_bits)
6513 hist_trigger_bits = attrs->map_bits;
6514
30350d65 6515 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
7ef224d1
TZ		 6516 if (IS_ERR(hist_data)) {
6517 destroy_hist_trigger_attrs(attrs);
6518 return PTR_ERR(hist_data);
6519 }
6520
e1f187d0 6521 trigger_data = event_trigger_alloc(cmd_ops, cmd, param, hist_data);
4b147936
TZ		 6522 if (!trigger_data) {
6523 ret = -ENOMEM;
7ef224d1 6524 goto out_free;
4b147936 6525 }
7ef224d1 6526
e1f187d0
TZ		 6527 ret = event_trigger_set_filter(cmd_ops, file, filter, trigger_data);
6528 if (ret < 0)
6529 goto out_free;
52a7f16d 6530
30350d65 6531 if (remove) {
4b147936
TZ		 6532 if (!have_hist_trigger_match(trigger_data, file))
6533 goto out_free;
6534
067fe038
TZ		 6535 if (hist_trigger_check_refs(trigger_data, file)) {
6536 ret = -EBUSY;
6537 goto out_free;
6538 }
6539
b8cc44a4 6540 event_trigger_unregister(cmd_ops, file, glob+1, trigger_data);
4b147936
TZ		 6541 se_name = trace_event_name(file->event_call);
6542 se = find_synth_event(se_name);
6543 if (se)
6544 se->ref--;
7ef224d1
TZ		 6545 ret = 0;
6546 goto out_free;
6547 }
6548
a7e6b7dc 6549 if (existing_hist_update_only(glob, trigger_data, file))
b8cc44a4 6550 goto out_free;
a7e6b7dc
TZ		 6551
6552 ret = event_trigger_register(cmd_ops, file, glob, trigger_data);
6553 if (ret < 0)
7ef224d1 6554 goto out_free;
067fe038
TZ		 6555
6556 if (get_named_trigger_data(trigger_data))
6557 goto enable;
6558
6559 if (has_hist_vars(hist_data))
6560 save_hist_vars(hist_data);
6561
7d18a10c 6562 ret = create_actions(hist_data);
0212e2aa
TZ		 6563 if (ret)
6564 goto out_unreg;
6565
067fe038
TZ		 6566 ret = tracing_map_init(hist_data->map);
6567 if (ret)
6568 goto out_unreg;
6569enable:
6570 ret = hist_trigger_enable(trigger_data, file);
6571 if (ret)
6572 goto out_unreg;
6573
4b147936
TZ		 6574 se_name = trace_event_name(file->event_call);
6575 se = find_synth_event(se_name);
6576 if (se)
6577 se->ref++;
7ef224d1 6578 out:
608c6ed3 6579 if (ret == 0 && glob[0])
f404da6e
TZ		 6580 hist_err_clear();
6581
7ef224d1 6582 return ret;
067fe038 6583 out_unreg:
b8cc44a4 6584 event_trigger_unregister(cmd_ops, file, glob+1, trigger_data);
7ef224d1 6585 out_free:
e1f187d0 6586 event_trigger_reset_filter(cmd_ops, trigger_data);
7ef224d1 6587
067fe038
TZ		 6588 remove_hist_vars(hist_data);
6589
7ef224d1
TZ		 6590 kfree(trigger_data);
6591
6592 destroy_hist_data(hist_data);
6593 goto out;
6594}
6595
6596static struct event_command trigger_hist_cmd = {
6597 .name = "hist",
6598 .trigger_type = ETT_EVENT_HIST,
6599 .flags = EVENT_CMD_FL_NEEDS_REC,
9ec5a7d1 6600 .parse = event_hist_trigger_parse,
7ef224d1 6601 .reg = hist_register_trigger,
52a7f16d
TZ		 6602 .unreg = hist_unregister_trigger,
6603 .unreg_all = hist_unreg_all,
7ef224d1
TZ		 6604 .get_trigger_ops = event_hist_get_trigger_ops,
6605 .set_filter = set_trigger_filter,
6606};
6607
6608__init int register_trigger_hist_cmd(void)
6609{
6610 int ret;
6611
6612 ret = register_event_command(&trigger_hist_cmd);
6613 WARN_ON(ret < 0);
6614
6615 return ret;
6616}
d0bad49b
TZ		 6617
6618static void
b47e3302
SRV		 6619hist_enable_trigger(struct event_trigger_data *data,
6620 struct trace_buffer *buffer, void *rec,
1ac4f51c 6621 struct ring_buffer_event *event)
d0bad49b
TZ		 6622{
6623 struct enable_trigger_data *enable_data = data->private_data;
6624 struct event_trigger_data *test;
6625
aeed8aa3
MH		 6626 list_for_each_entry_rcu(test, &enable_data->file->triggers, list,
6627 lockdep_is_held(&event_mutex)) {
d0bad49b
TZ		 6628 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6629 if (enable_data->enable)
6630 test->paused = false;
6631 else
6632 test->paused = true;
d0bad49b
TZ		 6633 }
6634 }
6635}
6636
6637static void
b47e3302
SRV		 6638hist_enable_count_trigger(struct event_trigger_data *data,
6639 struct trace_buffer *buffer, void *rec,
1ac4f51c 6640 struct ring_buffer_event *event)
d0bad49b
TZ		 6641{
6642 if (!data->count)
6643 return;
6644
6645 if (data->count != -1)
6646 (data->count)--;
6647
b47e3302 6648 hist_enable_trigger(data, buffer, rec, event);
d0bad49b
TZ		 6649}
6650
6651static struct event_trigger_ops hist_enable_trigger_ops = {
fb339e53 6652 .trigger = hist_enable_trigger,
d0bad49b
TZ		 6653 .print = event_enable_trigger_print,
6654 .init = event_trigger_init,
6655 .free = event_enable_trigger_free,
6656};
6657
6658static struct event_trigger_ops hist_enable_count_trigger_ops = {
fb339e53 6659 .trigger = hist_enable_count_trigger,
d0bad49b
TZ		 6660 .print = event_enable_trigger_print,
6661 .init = event_trigger_init,
6662 .free = event_enable_trigger_free,
6663};
6664
6665static struct event_trigger_ops hist_disable_trigger_ops = {
fb339e53 6666 .trigger = hist_enable_trigger,
d0bad49b
TZ		 6667 .print = event_enable_trigger_print,
6668 .init = event_trigger_init,
6669 .free = event_enable_trigger_free,
6670};
6671
6672static struct event_trigger_ops hist_disable_count_trigger_ops = {
fb339e53 6673 .trigger = hist_enable_count_trigger,
d0bad49b
TZ		 6674 .print = event_enable_trigger_print,
6675 .init = event_trigger_init,
6676 .free = event_enable_trigger_free,
6677};
6678
6679static struct event_trigger_ops *
6680hist_enable_get_trigger_ops(char *cmd, char *param)
6681{
6682 struct event_trigger_ops *ops;
6683 bool enable;
6684
6685 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6686
6687 if (enable)
6688 ops = param ? &hist_enable_count_trigger_ops :
6689 &hist_enable_trigger_ops;
6690 else
6691 ops = param ? &hist_disable_count_trigger_ops :
6692 &hist_disable_trigger_ops;
6693
6694 return ops;
6695}
6696
52a7f16d
TZ		 6697static void hist_enable_unreg_all(struct trace_event_file *file)
6698{
47c18569 6699 struct event_trigger_data *test, *n;
52a7f16d 6700
47c18569 6701 list_for_each_entry_safe(test, n, &file->triggers, list) {
52a7f16d
TZ		 6702 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6703 list_del_rcu(&test->list);
6704 update_cond_flag(file);
6705 trace_event_trigger_enable_disable(file, 0);
6706 if (test->ops->free)
47670541 6707 test->ops->free(test);
52a7f16d
TZ		 6708 }
6709 }
6710}
6711
d0bad49b
TZ		 6712static struct event_command trigger_hist_enable_cmd = {
6713 .name = ENABLE_HIST_STR,
6714 .trigger_type = ETT_HIST_ENABLE,
9ec5a7d1 6715 .parse = event_enable_trigger_parse,
d0bad49b
TZ		 6716 .reg = event_enable_register_trigger,
6717 .unreg = event_enable_unregister_trigger,
52a7f16d 6718 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6719 .get_trigger_ops = hist_enable_get_trigger_ops,
6720 .set_filter = set_trigger_filter,
6721};
6722
6723static struct event_command trigger_hist_disable_cmd = {
6724 .name = DISABLE_HIST_STR,
6725 .trigger_type = ETT_HIST_ENABLE,
9ec5a7d1 6726 .parse = event_enable_trigger_parse,
d0bad49b
TZ		 6727 .reg = event_enable_register_trigger,
6728 .unreg = event_enable_unregister_trigger,
52a7f16d 6729 .unreg_all = hist_enable_unreg_all,
d0bad49b
TZ		 6730 .get_trigger_ops = hist_enable_get_trigger_ops,
6731 .set_filter = set_trigger_filter,
6732};
6733
6734static __init void unregister_trigger_hist_enable_disable_cmds(void)
6735{
6736 unregister_event_command(&trigger_hist_enable_cmd);
6737 unregister_event_command(&trigger_hist_disable_cmd);
6738}
6739
6740__init int register_trigger_hist_enable_disable_cmds(void)
6741{
6742 int ret;
6743
6744 ret = register_event_command(&trigger_hist_enable_cmd);
6745 if (WARN_ON(ret < 0))
6746 return ret;
6747 ret = register_event_command(&trigger_hist_disable_cmd);
6748 if (WARN_ON(ret < 0))
6749 unregister_trigger_hist_enable_disable_cmds();
6750
6751 return ret;
6752}
Linux 6.x block layer and io_uring tree(s)