1 // SPDX-License-Identifier: GPL-2.0
3 * trace_events_hist - trace event hist triggers
5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
8 #include <linux/module.h>
9 #include <linux/kallsyms.h>
10 #include <linux/security.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/stacktrace.h>
14 #include <linux/rculist.h>
15 #include <linux/tracefs.h>
17 /* for gfp flag names */
18 #include <linux/trace_events.h>
19 #include <trace/events/mmflags.h>
21 #include "tracing_map.h"
22 #include "trace_synth.h"
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"), \
61 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
62 C(VAR_NOT_FOUND, "Couldn't find variable"), \
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)"), \
68 C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \
69 C(INVALID_STR_OPERAND, "String type can not be an operand in expression"), \
70 C(EXPECT_NUMBER, "Expecting numeric literal"), \
71 C(UNARY_MINUS_SUBEXPR, "Unary minus not supported in sub-expressions"), \
72 C(DIVISION_BY_ZERO, "Division by zero"), \
73 C(NEED_NOHC_VAL, "Non-hitcount value is required for 'nohitcount'"),
76 #define C(a, b) HIST_ERR_##a
83 static const char *err_text[] = { ERRORS };
87 typedef u64 (*hist_field_fn_t) (struct hist_field *field,
88 struct tracing_map_elt *elt,
89 struct trace_buffer *buffer,
90 struct ring_buffer_event *rbe,
93 #define HIST_FIELD_OPERANDS_MAX 2
94 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
95 #define HIST_ACTIONS_MAX 8
96 #define HIST_CONST_DIGITS_MAX 21
97 #define HIST_DIV_SHIFT 20 /* For optimizing division by constants */
103 FIELD_OP_UNARY_MINUS,
110 HIST_FIELD_FN_VAR_REF,
111 HIST_FIELD_FN_COUNTER,
114 HIST_FIELD_FN_BUCKET,
115 HIST_FIELD_FN_TIMESTAMP,
117 HIST_FIELD_FN_STRING,
118 HIST_FIELD_FN_DYNSTRING,
119 HIST_FIELD_FN_RELDYNSTRING,
120 HIST_FIELD_FN_PSTRING,
129 HIST_FIELD_FN_UMINUS,
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,
142 * A hist_var (histogram variable) contains variable information for
143 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
144 * flag set. A hist_var has a variable name e.g. ts0, and is
145 * associated with a given histogram trigger, as specified by
146 * hist_data. The hist_var idx is the unique index assigned to the
147 * variable by the hist trigger's tracing_map. The idx is what is
148 * used to set a variable's value and, by a variable reference, to
153 struct hist_trigger_data *hist_data;
158 struct ftrace_event_field *field;
160 unsigned long buckets;
162 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
163 struct hist_trigger_data *hist_data;
164 enum hist_field_fn fn_num;
168 unsigned int is_signed;
171 * Variable fields contain variable-specific info in var.
174 enum field_op_id operator;
179 * The name field is used for EXPR and VAR_REF fields. VAR
180 * fields contain the variable name in var.name.
185 * When a histogram trigger is hit, if it has any references
186 * to variables, the values of those variables are collected
187 * into a var_ref_vals array by resolve_var_refs(). The
188 * current value of each variable is read from the tracing_map
189 * using the hist field's hist_var.idx and entered into the
190 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
192 unsigned int var_ref_idx;
195 unsigned int var_str_idx;
197 /* Numeric literals are represented as u64 */
199 /* Used to optimize division by constants */
203 static u64 hist_fn_call(struct hist_field *hist_field,
204 struct tracing_map_elt *elt,
205 struct trace_buffer *buffer,
206 struct ring_buffer_event *rbe,
209 static u64 hist_field_const(struct hist_field *field,
210 struct tracing_map_elt *elt,
211 struct trace_buffer *buffer,
212 struct ring_buffer_event *rbe,
215 return field->constant;
218 static u64 hist_field_counter(struct hist_field *field,
219 struct tracing_map_elt *elt,
220 struct trace_buffer *buffer,
221 struct ring_buffer_event *rbe,
227 static u64 hist_field_string(struct hist_field *hist_field,
228 struct tracing_map_elt *elt,
229 struct trace_buffer *buffer,
230 struct ring_buffer_event *rbe,
233 char *addr = (char *)(event + hist_field->field->offset);
235 return (u64)(unsigned long)addr;
238 static u64 hist_field_dynstring(struct hist_field *hist_field,
239 struct tracing_map_elt *elt,
240 struct trace_buffer *buffer,
241 struct ring_buffer_event *rbe,
244 u32 str_item = *(u32 *)(event + hist_field->field->offset);
245 int str_loc = str_item & 0xffff;
246 char *addr = (char *)(event + str_loc);
248 return (u64)(unsigned long)addr;
251 static u64 hist_field_reldynstring(struct hist_field *hist_field,
252 struct tracing_map_elt *elt,
253 struct trace_buffer *buffer,
254 struct ring_buffer_event *rbe,
257 u32 *item = event + hist_field->field->offset;
258 u32 str_item = *item;
259 int str_loc = str_item & 0xffff;
260 char *addr = (char *)&item[1] + str_loc;
262 return (u64)(unsigned long)addr;
265 static u64 hist_field_pstring(struct hist_field *hist_field,
266 struct tracing_map_elt *elt,
267 struct trace_buffer *buffer,
268 struct ring_buffer_event *rbe,
271 char **addr = (char **)(event + hist_field->field->offset);
273 return (u64)(unsigned long)*addr;
276 static u64 hist_field_log2(struct hist_field *hist_field,
277 struct tracing_map_elt *elt,
278 struct trace_buffer *buffer,
279 struct ring_buffer_event *rbe,
282 struct hist_field *operand = hist_field->operands[0];
284 u64 val = hist_fn_call(operand, elt, buffer, rbe, event);
286 return (u64) ilog2(roundup_pow_of_two(val));
289 static u64 hist_field_bucket(struct hist_field *hist_field,
290 struct tracing_map_elt *elt,
291 struct trace_buffer *buffer,
292 struct ring_buffer_event *rbe,
295 struct hist_field *operand = hist_field->operands[0];
296 unsigned long buckets = hist_field->buckets;
298 u64 val = hist_fn_call(operand, elt, buffer, rbe, event);
300 if (WARN_ON_ONCE(!buckets))
304 val = div64_ul(val, buckets);
306 val = (u64)((unsigned long)val / buckets);
307 return val * buckets;
310 static u64 hist_field_plus(struct hist_field *hist_field,
311 struct tracing_map_elt *elt,
312 struct trace_buffer *buffer,
313 struct ring_buffer_event *rbe,
316 struct hist_field *operand1 = hist_field->operands[0];
317 struct hist_field *operand2 = hist_field->operands[1];
319 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
320 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
325 static u64 hist_field_minus(struct hist_field *hist_field,
326 struct tracing_map_elt *elt,
327 struct trace_buffer *buffer,
328 struct ring_buffer_event *rbe,
331 struct hist_field *operand1 = hist_field->operands[0];
332 struct hist_field *operand2 = hist_field->operands[1];
334 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
335 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
340 static u64 hist_field_div(struct hist_field *hist_field,
341 struct tracing_map_elt *elt,
342 struct trace_buffer *buffer,
343 struct ring_buffer_event *rbe,
346 struct hist_field *operand1 = hist_field->operands[0];
347 struct hist_field *operand2 = hist_field->operands[1];
349 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
350 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
352 /* Return -1 for the undefined case */
356 /* Use shift if the divisor is a power of 2 */
357 if (!(val2 & (val2 - 1)))
358 return val1 >> __ffs64(val2);
360 return div64_u64(val1, val2);
363 static u64 div_by_power_of_two(struct hist_field *hist_field,
364 struct tracing_map_elt *elt,
365 struct trace_buffer *buffer,
366 struct ring_buffer_event *rbe,
369 struct hist_field *operand1 = hist_field->operands[0];
370 struct hist_field *operand2 = hist_field->operands[1];
372 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
374 return val1 >> __ffs64(operand2->constant);
377 static u64 div_by_not_power_of_two(struct hist_field *hist_field,
378 struct tracing_map_elt *elt,
379 struct trace_buffer *buffer,
380 struct ring_buffer_event *rbe,
383 struct hist_field *operand1 = hist_field->operands[0];
384 struct hist_field *operand2 = hist_field->operands[1];
386 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
388 return div64_u64(val1, operand2->constant);
391 static u64 div_by_mult_and_shift(struct hist_field *hist_field,
392 struct tracing_map_elt *elt,
393 struct trace_buffer *buffer,
394 struct ring_buffer_event *rbe,
397 struct hist_field *operand1 = hist_field->operands[0];
398 struct hist_field *operand2 = hist_field->operands[1];
400 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
403 * If the divisor is a constant, do a multiplication and shift instead.
405 * Choose Z = some power of 2. If Y <= Z, then:
406 * X / Y = (X * (Z / Y)) / Z
408 * (Z / Y) is a constant (mult) which is calculated at parse time, so:
409 * X / Y = (X * mult) / Z
411 * The division by Z can be replaced by a shift since Z is a power of 2:
412 * X / Y = (X * mult) >> HIST_DIV_SHIFT
414 * As long, as X < Z the results will not be off by more than 1.
416 if (val1 < (1 << HIST_DIV_SHIFT)) {
417 u64 mult = operand2->div_multiplier;
419 return (val1 * mult + ((1 << HIST_DIV_SHIFT) - 1)) >> HIST_DIV_SHIFT;
422 return div64_u64(val1, operand2->constant);
425 static u64 hist_field_mult(struct hist_field *hist_field,
426 struct tracing_map_elt *elt,
427 struct trace_buffer *buffer,
428 struct ring_buffer_event *rbe,
431 struct hist_field *operand1 = hist_field->operands[0];
432 struct hist_field *operand2 = hist_field->operands[1];
434 u64 val1 = hist_fn_call(operand1, elt, buffer, rbe, event);
435 u64 val2 = hist_fn_call(operand2, elt, buffer, rbe, event);
440 static u64 hist_field_unary_minus(struct hist_field *hist_field,
441 struct tracing_map_elt *elt,
442 struct trace_buffer *buffer,
443 struct ring_buffer_event *rbe,
446 struct hist_field *operand = hist_field->operands[0];
448 s64 sval = (s64)hist_fn_call(operand, elt, buffer, rbe, event);
449 u64 val = (u64)-sval;
454 #define DEFINE_HIST_FIELD_FN(type) \
455 static u64 hist_field_##type(struct hist_field *hist_field, \
456 struct tracing_map_elt *elt, \
457 struct trace_buffer *buffer, \
458 struct ring_buffer_event *rbe, \
461 type *addr = (type *)(event + hist_field->field->offset); \
463 return (u64)(unsigned long)*addr; \
466 DEFINE_HIST_FIELD_FN(s64);
467 DEFINE_HIST_FIELD_FN(u64);
468 DEFINE_HIST_FIELD_FN(s32);
469 DEFINE_HIST_FIELD_FN(u32);
470 DEFINE_HIST_FIELD_FN(s16);
471 DEFINE_HIST_FIELD_FN(u16);
472 DEFINE_HIST_FIELD_FN(s8);
473 DEFINE_HIST_FIELD_FN(u8);
475 #define for_each_hist_field(i, hist_data) \
476 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
478 #define for_each_hist_val_field(i, hist_data) \
479 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
481 #define for_each_hist_key_field(i, hist_data) \
482 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
484 #define HITCOUNT_IDX 0
485 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
487 enum hist_field_flags {
488 HIST_FIELD_FL_HITCOUNT = 1 << 0,
489 HIST_FIELD_FL_KEY = 1 << 1,
490 HIST_FIELD_FL_STRING = 1 << 2,
491 HIST_FIELD_FL_HEX = 1 << 3,
492 HIST_FIELD_FL_SYM = 1 << 4,
493 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
494 HIST_FIELD_FL_EXECNAME = 1 << 6,
495 HIST_FIELD_FL_SYSCALL = 1 << 7,
496 HIST_FIELD_FL_STACKTRACE = 1 << 8,
497 HIST_FIELD_FL_LOG2 = 1 << 9,
498 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
499 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
500 HIST_FIELD_FL_VAR = 1 << 12,
501 HIST_FIELD_FL_EXPR = 1 << 13,
502 HIST_FIELD_FL_VAR_REF = 1 << 14,
503 HIST_FIELD_FL_CPU = 1 << 15,
504 HIST_FIELD_FL_ALIAS = 1 << 16,
505 HIST_FIELD_FL_BUCKET = 1 << 17,
506 HIST_FIELD_FL_CONST = 1 << 18,
507 HIST_FIELD_FL_PERCENT = 1 << 19,
508 HIST_FIELD_FL_GRAPH = 1 << 20,
513 char *name[TRACING_MAP_VARS_MAX];
514 char *expr[TRACING_MAP_VARS_MAX];
517 struct hist_trigger_attrs {
528 unsigned int map_bits;
530 char *assignment_str[TRACING_MAP_VARS_MAX];
531 unsigned int n_assignments;
533 char *action_str[HIST_ACTIONS_MAX];
534 unsigned int n_actions;
536 struct var_defs var_defs;
540 struct hist_field *var;
541 struct hist_field *val;
544 struct field_var_hist {
545 struct hist_trigger_data *hist_data;
549 struct hist_trigger_data {
550 struct hist_field *fields[HIST_FIELDS_MAX];
553 unsigned int n_fields;
555 unsigned int n_var_str;
556 unsigned int key_size;
557 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
558 unsigned int n_sort_keys;
559 struct trace_event_file *event_file;
560 struct hist_trigger_attrs *attrs;
561 struct tracing_map *map;
562 bool enable_timestamps;
564 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
565 unsigned int n_var_refs;
567 struct action_data *actions[HIST_ACTIONS_MAX];
568 unsigned int n_actions;
570 struct field_var *field_vars[SYNTH_FIELDS_MAX];
571 unsigned int n_field_vars;
572 unsigned int n_field_var_str;
573 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
574 unsigned int n_field_var_hists;
576 struct field_var *save_vars[SYNTH_FIELDS_MAX];
577 unsigned int n_save_vars;
578 unsigned int n_save_var_str;
583 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
584 struct tracing_map_elt *elt,
585 struct trace_buffer *buffer, void *rec,
586 struct ring_buffer_event *rbe, void *key,
587 struct action_data *data, u64 *var_ref_vals);
589 typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
604 enum handler_id handler;
605 enum action_id action;
609 unsigned int n_params;
610 char *params[SYNTH_FIELDS_MAX];
613 * When a histogram trigger is hit, the values of any
614 * references to variables, including variables being passed
615 * as parameters to synthetic events, are collected into a
616 * var_ref_vals array. This var_ref_idx array is an array of
617 * indices into the var_ref_vals array, one for each synthetic
618 * event param, and is passed to the synthetic event
621 unsigned int var_ref_idx[SYNTH_FIELDS_MAX];
622 struct synth_event *synth_event;
623 bool use_trace_keyword;
624 char *synth_event_name;
634 * var_str contains the $-unstripped variable
635 * name referenced by var_ref, and used when
636 * printing the action. Because var_ref
637 * creation is deferred to create_actions(),
638 * we need a per-action way to save it until
639 * then, thus var_str.
644 * var_ref refers to the variable being
645 * tracked e.g onmax($var).
647 struct hist_field *var_ref;
650 * track_var contains the 'invisible' tracking
651 * variable created to keep the current
654 struct hist_field *track_var;
656 check_track_val_fn_t check_val;
657 action_fn_t save_data;
666 unsigned int key_len;
668 struct tracing_map_elt elt;
670 struct action_data *action_data;
671 struct hist_trigger_data *hist_data;
674 struct hist_elt_data {
677 char **field_var_str;
681 struct snapshot_context {
682 struct tracing_map_elt *elt;
687 * Returns the specific division function to use if the divisor
688 * is constant. This avoids extra branches when the trigger is hit.
690 static enum hist_field_fn hist_field_get_div_fn(struct hist_field *divisor)
692 u64 div = divisor->constant;
694 if (!(div & (div - 1)))
695 return HIST_FIELD_FN_DIV_POWER2;
697 /* If the divisor is too large, do a regular division */
698 if (div > (1 << HIST_DIV_SHIFT))
699 return HIST_FIELD_FN_DIV_NOT_POWER2;
701 divisor->div_multiplier = div64_u64((u64)(1 << HIST_DIV_SHIFT), div);
702 return HIST_FIELD_FN_DIV_MULT_SHIFT;
705 static void track_data_free(struct track_data *track_data)
707 struct hist_elt_data *elt_data;
712 kfree(track_data->key);
714 elt_data = track_data->elt.private_data;
716 kfree(elt_data->comm);
723 static struct track_data *track_data_alloc(unsigned int key_len,
724 struct action_data *action_data,
725 struct hist_trigger_data *hist_data)
727 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
728 struct hist_elt_data *elt_data;
731 return ERR_PTR(-ENOMEM);
733 data->key = kzalloc(key_len, GFP_KERNEL);
735 track_data_free(data);
736 return ERR_PTR(-ENOMEM);
739 data->key_len = key_len;
740 data->action_data = action_data;
741 data->hist_data = hist_data;
743 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
745 track_data_free(data);
746 return ERR_PTR(-ENOMEM);
749 data->elt.private_data = elt_data;
751 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
752 if (!elt_data->comm) {
753 track_data_free(data);
754 return ERR_PTR(-ENOMEM);
760 #define HIST_PREFIX "hist:"
762 static char *last_cmd;
763 static char last_cmd_loc[MAX_FILTER_STR_VAL];
765 static int errpos(char *str)
767 if (!str || !last_cmd)
770 return err_pos(last_cmd, str);
773 static void last_cmd_set(struct trace_event_file *file, char *str)
775 const char *system = NULL, *name = NULL;
776 struct trace_event_call *call;
783 last_cmd = kasprintf(GFP_KERNEL, HIST_PREFIX "%s", str);
788 call = file->event_call;
789 system = call->class->system;
791 name = trace_event_name(call);
798 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, HIST_PREFIX "%s:%s", system, name);
801 static void hist_err(struct trace_array *tr, u8 err_type, u16 err_pos)
806 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
810 static void hist_err_clear(void)
814 last_cmd_loc[0] = '\0';
817 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
818 unsigned int *var_ref_idx);
820 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
821 unsigned int *var_ref_idx)
823 struct tracepoint *tp = event->tp;
825 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
826 struct tracepoint_func *probe_func_ptr;
827 synth_probe_func_t probe_func;
830 if (!(cpu_online(raw_smp_processor_id())))
833 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
834 if (probe_func_ptr) {
836 probe_func = probe_func_ptr->func;
837 __data = probe_func_ptr->data;
838 probe_func(__data, var_ref_vals, var_ref_idx);
839 } while ((++probe_func_ptr)->func);
844 static void action_trace(struct hist_trigger_data *hist_data,
845 struct tracing_map_elt *elt,
846 struct trace_buffer *buffer, void *rec,
847 struct ring_buffer_event *rbe, void *key,
848 struct action_data *data, u64 *var_ref_vals)
850 struct synth_event *event = data->synth_event;
852 trace_synth(event, var_ref_vals, data->var_ref_idx);
855 struct hist_var_data {
856 struct list_head list;
857 struct hist_trigger_data *hist_data;
860 static u64 hist_field_timestamp(struct hist_field *hist_field,
861 struct tracing_map_elt *elt,
862 struct trace_buffer *buffer,
863 struct ring_buffer_event *rbe,
866 struct hist_trigger_data *hist_data = hist_field->hist_data;
867 struct trace_array *tr = hist_data->event_file->tr;
869 u64 ts = ring_buffer_event_time_stamp(buffer, rbe);
871 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
877 static u64 hist_field_cpu(struct hist_field *hist_field,
878 struct tracing_map_elt *elt,
879 struct trace_buffer *buffer,
880 struct ring_buffer_event *rbe,
883 int cpu = smp_processor_id();
889 * check_field_for_var_ref - Check if a VAR_REF field references a variable
890 * @hist_field: The VAR_REF field to check
891 * @var_data: The hist trigger that owns the variable
892 * @var_idx: The trigger variable identifier
894 * Check the given VAR_REF field to see whether or not it references
895 * the given variable associated with the given trigger.
897 * Return: The VAR_REF field if it does reference the variable, NULL if not
899 static struct hist_field *
900 check_field_for_var_ref(struct hist_field *hist_field,
901 struct hist_trigger_data *var_data,
902 unsigned int var_idx)
904 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
906 if (hist_field && hist_field->var.idx == var_idx &&
907 hist_field->var.hist_data == var_data)
914 * find_var_ref - Check if a trigger has a reference to a trigger variable
915 * @hist_data: The hist trigger that might have a reference to the variable
916 * @var_data: The hist trigger that owns the variable
917 * @var_idx: The trigger variable identifier
919 * Check the list of var_refs[] on the first hist trigger to see
920 * whether any of them are references to the variable on the second
923 * Return: The VAR_REF field referencing the variable if so, NULL if not
925 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
926 struct hist_trigger_data *var_data,
927 unsigned int var_idx)
929 struct hist_field *hist_field;
932 for (i = 0; i < hist_data->n_var_refs; i++) {
933 hist_field = hist_data->var_refs[i];
934 if (check_field_for_var_ref(hist_field, var_data, var_idx))
942 * find_any_var_ref - Check if there is a reference to a given trigger variable
943 * @hist_data: The hist trigger
944 * @var_idx: The trigger variable identifier
946 * Check to see whether the given variable is currently referenced by
949 * The trigger the variable is defined on is explicitly excluded - the
950 * assumption being that a self-reference doesn't prevent a trigger
951 * from being removed.
953 * Return: The VAR_REF field referencing the variable if so, NULL if not
955 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
956 unsigned int var_idx)
958 struct trace_array *tr = hist_data->event_file->tr;
959 struct hist_field *found = NULL;
960 struct hist_var_data *var_data;
962 list_for_each_entry(var_data, &tr->hist_vars, list) {
963 if (var_data->hist_data == hist_data)
965 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
974 * check_var_refs - Check if there is a reference to any of trigger's variables
975 * @hist_data: The hist trigger
977 * A trigger can define one or more variables. If any one of them is
978 * currently referenced by any other trigger, this function will
981 * Typically used to determine whether or not a trigger can be removed
982 * - if there are any references to a trigger's variables, it cannot.
984 * Return: True if there is a reference to any of trigger's variables
986 static bool check_var_refs(struct hist_trigger_data *hist_data)
988 struct hist_field *field;
992 for_each_hist_field(i, hist_data) {
993 field = hist_data->fields[i];
994 if (field && field->flags & HIST_FIELD_FL_VAR) {
995 if (find_any_var_ref(hist_data, field->var.idx)) {
1005 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1007 struct trace_array *tr = hist_data->event_file->tr;
1008 struct hist_var_data *var_data, *found = NULL;
1010 list_for_each_entry(var_data, &tr->hist_vars, list) {
1011 if (var_data->hist_data == hist_data) {
1020 static bool field_has_hist_vars(struct hist_field *hist_field,
1031 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1032 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1035 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1036 struct hist_field *operand;
1038 operand = hist_field->operands[i];
1039 if (field_has_hist_vars(operand, level + 1))
1046 static bool has_hist_vars(struct hist_trigger_data *hist_data)
1048 struct hist_field *hist_field;
1051 for_each_hist_field(i, hist_data) {
1052 hist_field = hist_data->fields[i];
1053 if (field_has_hist_vars(hist_field, 0))
1060 static int save_hist_vars(struct hist_trigger_data *hist_data)
1062 struct trace_array *tr = hist_data->event_file->tr;
1063 struct hist_var_data *var_data;
1065 var_data = find_hist_vars(hist_data);
1069 if (tracing_check_open_get_tr(tr))
1072 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1074 trace_array_put(tr);
1078 var_data->hist_data = hist_data;
1079 list_add(&var_data->list, &tr->hist_vars);
1084 static void remove_hist_vars(struct hist_trigger_data *hist_data)
1086 struct trace_array *tr = hist_data->event_file->tr;
1087 struct hist_var_data *var_data;
1089 var_data = find_hist_vars(hist_data);
1093 if (WARN_ON(check_var_refs(hist_data)))
1096 list_del(&var_data->list);
1100 trace_array_put(tr);
1103 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1104 const char *var_name)
1106 struct hist_field *hist_field, *found = NULL;
1109 for_each_hist_field(i, hist_data) {
1110 hist_field = hist_data->fields[i];
1111 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1112 strcmp(hist_field->var.name, var_name) == 0) {
1121 static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1122 struct trace_event_file *file,
1123 const char *var_name)
1125 struct hist_trigger_data *test_data;
1126 struct event_trigger_data *test;
1127 struct hist_field *hist_field;
1129 lockdep_assert_held(&event_mutex);
1131 hist_field = find_var_field(hist_data, var_name);
1135 list_for_each_entry(test, &file->triggers, list) {
1136 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1137 test_data = test->private_data;
1138 hist_field = find_var_field(test_data, var_name);
1147 static struct trace_event_file *find_var_file(struct trace_array *tr,
1152 struct hist_trigger_data *var_hist_data;
1153 struct hist_var_data *var_data;
1154 struct trace_event_file *file, *found = NULL;
1157 return find_event_file(tr, system, event_name);
1159 list_for_each_entry(var_data, &tr->hist_vars, list) {
1160 var_hist_data = var_data->hist_data;
1161 file = var_hist_data->event_file;
1165 if (find_var_field(var_hist_data, var_name)) {
1167 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
1178 static struct hist_field *find_file_var(struct trace_event_file *file,
1179 const char *var_name)
1181 struct hist_trigger_data *test_data;
1182 struct event_trigger_data *test;
1183 struct hist_field *hist_field;
1185 lockdep_assert_held(&event_mutex);
1187 list_for_each_entry(test, &file->triggers, list) {
1188 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1189 test_data = test->private_data;
1190 hist_field = find_var_field(test_data, var_name);
1199 static struct hist_field *
1200 find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1202 struct trace_array *tr = hist_data->event_file->tr;
1203 struct hist_field *hist_field, *found = NULL;
1204 struct trace_event_file *file;
1207 for (i = 0; i < hist_data->n_actions; i++) {
1208 struct action_data *data = hist_data->actions[i];
1210 if (data->handler == HANDLER_ONMATCH) {
1211 char *system = data->match_data.event_system;
1212 char *event_name = data->match_data.event;
1214 file = find_var_file(tr, system, event_name, var_name);
1217 hist_field = find_file_var(file, var_name);
1220 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1222 return ERR_PTR(-EINVAL);
1232 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1237 struct trace_array *tr = hist_data->event_file->tr;
1238 struct hist_field *hist_field = NULL;
1239 struct trace_event_file *file;
1241 if (!system || !event_name) {
1242 hist_field = find_match_var(hist_data, var_name);
1243 if (IS_ERR(hist_field))
1249 file = find_var_file(tr, system, event_name, var_name);
1253 hist_field = find_file_var(file, var_name);
1258 static u64 hist_field_var_ref(struct hist_field *hist_field,
1259 struct tracing_map_elt *elt,
1260 struct trace_buffer *buffer,
1261 struct ring_buffer_event *rbe,
1264 struct hist_elt_data *elt_data;
1267 if (WARN_ON_ONCE(!elt))
1270 elt_data = elt->private_data;
1271 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1276 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1277 u64 *var_ref_vals, bool self)
1279 struct hist_trigger_data *var_data;
1280 struct tracing_map_elt *var_elt;
1281 struct hist_field *hist_field;
1282 unsigned int i, var_idx;
1283 bool resolved = true;
1286 for (i = 0; i < hist_data->n_var_refs; i++) {
1287 hist_field = hist_data->var_refs[i];
1288 var_idx = hist_field->var.idx;
1289 var_data = hist_field->var.hist_data;
1291 if (var_data == NULL) {
1296 if ((self && var_data != hist_data) ||
1297 (!self && var_data == hist_data))
1300 var_elt = tracing_map_lookup(var_data->map, key);
1306 if (!tracing_map_var_set(var_elt, var_idx)) {
1311 if (self || !hist_field->read_once)
1312 var_val = tracing_map_read_var(var_elt, var_idx);
1314 var_val = tracing_map_read_var_once(var_elt, var_idx);
1316 var_ref_vals[i] = var_val;
1322 static const char *hist_field_name(struct hist_field *field,
1325 const char *field_name = "";
1327 if (WARN_ON_ONCE(!field))
1334 field_name = field->field->name;
1335 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1336 field->flags & HIST_FIELD_FL_ALIAS ||
1337 field->flags & HIST_FIELD_FL_BUCKET)
1338 field_name = hist_field_name(field->operands[0], ++level);
1339 else if (field->flags & HIST_FIELD_FL_CPU)
1340 field_name = "common_cpu";
1341 else if (field->flags & HIST_FIELD_FL_EXPR ||
1342 field->flags & HIST_FIELD_FL_VAR_REF) {
1343 if (field->system) {
1344 static char full_name[MAX_FILTER_STR_VAL];
1346 strcat(full_name, field->system);
1347 strcat(full_name, ".");
1348 strcat(full_name, field->event_name);
1349 strcat(full_name, ".");
1350 strcat(full_name, field->name);
1351 field_name = full_name;
1353 field_name = field->name;
1354 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1355 field_name = "common_timestamp";
1356 else if (field->flags & HIST_FIELD_FL_STACKTRACE) {
1358 field_name = field->field->name;
1360 field_name = "common_stacktrace";
1361 } else if (field->flags & HIST_FIELD_FL_HITCOUNT)
1362 field_name = "hitcount";
1364 if (field_name == NULL)
1370 static enum hist_field_fn select_value_fn(int field_size, int field_is_signed)
1372 switch (field_size) {
1374 if (field_is_signed)
1375 return HIST_FIELD_FN_S64;
1377 return HIST_FIELD_FN_U64;
1379 if (field_is_signed)
1380 return HIST_FIELD_FN_S32;
1382 return HIST_FIELD_FN_U32;
1384 if (field_is_signed)
1385 return HIST_FIELD_FN_S16;
1387 return HIST_FIELD_FN_U16;
1389 if (field_is_signed)
1390 return HIST_FIELD_FN_S8;
1392 return HIST_FIELD_FN_U8;
1395 return HIST_FIELD_FN_NOP;
1398 static int parse_map_size(char *str)
1400 unsigned long size, map_bits;
1403 ret = kstrtoul(str, 0, &size);
1407 map_bits = ilog2(roundup_pow_of_two(size));
1408 if (map_bits < TRACING_MAP_BITS_MIN ||
1409 map_bits > TRACING_MAP_BITS_MAX)
1417 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1424 for (i = 0; i < attrs->n_assignments; i++)
1425 kfree(attrs->assignment_str[i]);
1427 for (i = 0; i < attrs->n_actions; i++)
1428 kfree(attrs->action_str[i]);
1431 kfree(attrs->sort_key_str);
1432 kfree(attrs->keys_str);
1433 kfree(attrs->vals_str);
1434 kfree(attrs->clock);
1438 static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1442 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1445 if ((str_has_prefix(str, "onmatch(")) ||
1446 (str_has_prefix(str, "onmax(")) ||
1447 (str_has_prefix(str, "onchange("))) {
1448 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1449 if (!attrs->action_str[attrs->n_actions]) {
1459 static int parse_assignment(struct trace_array *tr,
1460 char *str, struct hist_trigger_attrs *attrs)
1464 if ((len = str_has_prefix(str, "key=")) ||
1465 (len = str_has_prefix(str, "keys="))) {
1466 attrs->keys_str = kstrdup(str + len, GFP_KERNEL);
1467 if (!attrs->keys_str) {
1471 } else if ((len = str_has_prefix(str, "val=")) ||
1472 (len = str_has_prefix(str, "vals=")) ||
1473 (len = str_has_prefix(str, "values="))) {
1474 attrs->vals_str = kstrdup(str + len, GFP_KERNEL);
1475 if (!attrs->vals_str) {
1479 } else if ((len = str_has_prefix(str, "sort="))) {
1480 attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL);
1481 if (!attrs->sort_key_str) {
1485 } else if (str_has_prefix(str, "name=")) {
1486 attrs->name = kstrdup(str, GFP_KERNEL);
1491 } else if ((len = str_has_prefix(str, "clock="))) {
1494 str = strstrip(str);
1495 attrs->clock = kstrdup(str, GFP_KERNEL);
1496 if (!attrs->clock) {
1500 } else if ((len = str_has_prefix(str, "size="))) {
1501 int map_bits = parse_map_size(str + len);
1507 attrs->map_bits = map_bits;
1511 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
1512 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
1517 assignment = kstrdup(str, GFP_KERNEL);
1523 attrs->assignment_str[attrs->n_assignments++] = assignment;
1529 static struct hist_trigger_attrs *
1530 parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
1532 struct hist_trigger_attrs *attrs;
1535 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1537 return ERR_PTR(-ENOMEM);
1539 while (trigger_str) {
1540 char *str = strsep(&trigger_str, ":");
1543 rhs = strchr(str, '=');
1545 if (!strlen(++rhs)) {
1547 hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str));
1550 ret = parse_assignment(tr, str, attrs);
1553 } else if (strcmp(str, "nohitcount") == 0 ||
1554 strcmp(str, "NOHC") == 0)
1555 attrs->no_hitcount = true;
1556 else if (strcmp(str, "pause") == 0)
1557 attrs->pause = true;
1558 else if ((strcmp(str, "cont") == 0) ||
1559 (strcmp(str, "continue") == 0))
1561 else if (strcmp(str, "clear") == 0)
1562 attrs->clear = true;
1564 ret = parse_action(str, attrs);
1570 if (!attrs->keys_str) {
1575 if (!attrs->clock) {
1576 attrs->clock = kstrdup("global", GFP_KERNEL);
1577 if (!attrs->clock) {
1585 destroy_hist_trigger_attrs(attrs);
1587 return ERR_PTR(ret);
1590 static inline void save_comm(char *comm, struct task_struct *task)
1593 strcpy(comm, "<idle>");
1597 if (WARN_ON_ONCE(task->pid < 0)) {
1598 strcpy(comm, "<XXX>");
1602 strncpy(comm, task->comm, TASK_COMM_LEN);
1605 static void hist_elt_data_free(struct hist_elt_data *elt_data)
1609 for (i = 0; i < elt_data->n_field_var_str; i++)
1610 kfree(elt_data->field_var_str[i]);
1612 kfree(elt_data->field_var_str);
1614 kfree(elt_data->comm);
1618 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
1620 struct hist_elt_data *elt_data = elt->private_data;
1622 hist_elt_data_free(elt_data);
1625 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
1627 struct hist_trigger_data *hist_data = elt->map->private_data;
1628 unsigned int size = TASK_COMM_LEN;
1629 struct hist_elt_data *elt_data;
1630 struct hist_field *hist_field;
1631 unsigned int i, n_str;
1633 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
1637 for_each_hist_field(i, hist_data) {
1638 hist_field = hist_data->fields[i];
1640 if (hist_field->flags & HIST_FIELD_FL_EXECNAME) {
1641 elt_data->comm = kzalloc(size, GFP_KERNEL);
1642 if (!elt_data->comm) {
1650 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str +
1651 hist_data->n_var_str;
1652 if (n_str > SYNTH_FIELDS_MAX) {
1653 hist_elt_data_free(elt_data);
1657 BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
1659 size = STR_VAR_LEN_MAX;
1661 elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL);
1662 if (!elt_data->field_var_str) {
1663 hist_elt_data_free(elt_data);
1666 elt_data->n_field_var_str = n_str;
1668 for (i = 0; i < n_str; i++) {
1669 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
1670 if (!elt_data->field_var_str[i]) {
1671 hist_elt_data_free(elt_data);
1676 elt->private_data = elt_data;
1681 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
1683 struct hist_elt_data *elt_data = elt->private_data;
1686 save_comm(elt_data->comm, current);
1689 static const struct tracing_map_ops hist_trigger_elt_data_ops = {
1690 .elt_alloc = hist_trigger_elt_data_alloc,
1691 .elt_free = hist_trigger_elt_data_free,
1692 .elt_init = hist_trigger_elt_data_init,
1695 static const char *get_hist_field_flags(struct hist_field *hist_field)
1697 const char *flags_str = NULL;
1699 if (hist_field->flags & HIST_FIELD_FL_HEX)
1701 else if (hist_field->flags & HIST_FIELD_FL_SYM)
1703 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
1704 flags_str = "sym-offset";
1705 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
1706 flags_str = "execname";
1707 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
1708 flags_str = "syscall";
1709 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
1711 else if (hist_field->flags & HIST_FIELD_FL_BUCKET)
1712 flags_str = "buckets";
1713 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
1714 flags_str = "usecs";
1715 else if (hist_field->flags & HIST_FIELD_FL_PERCENT)
1716 flags_str = "percent";
1717 else if (hist_field->flags & HIST_FIELD_FL_GRAPH)
1718 flags_str = "graph";
1719 else if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
1720 flags_str = "stacktrace";
1725 static void expr_field_str(struct hist_field *field, char *expr)
1727 if (field->flags & HIST_FIELD_FL_VAR_REF)
1729 else if (field->flags & HIST_FIELD_FL_CONST) {
1730 char str[HIST_CONST_DIGITS_MAX];
1732 snprintf(str, HIST_CONST_DIGITS_MAX, "%llu", field->constant);
1736 strcat(expr, hist_field_name(field, 0));
1738 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
1739 const char *flags_str = get_hist_field_flags(field);
1743 strcat(expr, flags_str);
1748 static char *expr_str(struct hist_field *field, unsigned int level)
1755 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
1759 if (!field->operands[0]) {
1760 expr_field_str(field, expr);
1764 if (field->operator == FIELD_OP_UNARY_MINUS) {
1768 subexpr = expr_str(field->operands[0], ++level);
1773 strcat(expr, subexpr);
1781 expr_field_str(field->operands[0], expr);
1783 switch (field->operator) {
1784 case FIELD_OP_MINUS:
1801 expr_field_str(field->operands[1], expr);
1807 * If field_op != FIELD_OP_NONE, *sep points to the root operator
1808 * of the expression tree to be evaluated.
1810 static int contains_operator(char *str, char **sep)
1812 enum field_op_id field_op = FIELD_OP_NONE;
1813 char *minus_op, *plus_op, *div_op, *mult_op;
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.
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
1827 * First, find lower precedence addition and subtraction
1828 * since the expression will be evaluated recursively.
1830 minus_op = strrchr(str, '-');
1833 * Unary minus is not supported in sub-expressions. If
1834 * present, it is always the next root operator.
1836 if (minus_op == str) {
1837 field_op = FIELD_OP_UNARY_MINUS;
1841 field_op = FIELD_OP_MINUS;
1844 plus_op = strrchr(str, '+');
1845 if (plus_op || minus_op) {
1847 * For operators of the same precedence use to rightmost as the
1848 * root, so that the expression is evaluated left to right.
1850 if (plus_op > minus_op)
1851 field_op = FIELD_OP_PLUS;
1856 * Multiplication and division have higher precedence than addition and
1859 div_op = strrchr(str, '/');
1861 field_op = FIELD_OP_DIV;
1863 mult_op = strrchr(str, '*');
1865 * For operators of the same precedence use to rightmost as the
1866 * root, so that the expression is evaluated left to right.
1868 if (mult_op > div_op)
1869 field_op = FIELD_OP_MULT;
1874 case FIELD_OP_UNARY_MINUS:
1875 case FIELD_OP_MINUS:
1897 static void get_hist_field(struct hist_field *hist_field)
1902 static void __destroy_hist_field(struct hist_field *hist_field)
1904 if (--hist_field->ref > 1)
1907 kfree(hist_field->var.name);
1908 kfree(hist_field->name);
1910 /* Can likely be a const */
1911 kfree_const(hist_field->type);
1913 kfree(hist_field->system);
1914 kfree(hist_field->event_name);
1919 static void destroy_hist_field(struct hist_field *hist_field,
1930 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
1931 return; /* var refs will be destroyed separately */
1933 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
1934 destroy_hist_field(hist_field->operands[i], level + 1);
1936 __destroy_hist_field(hist_field);
1939 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
1940 struct ftrace_event_field *field,
1941 unsigned long flags,
1944 struct hist_field *hist_field;
1946 if (field && is_function_field(field))
1949 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
1953 hist_field->ref = 1;
1955 hist_field->hist_data = hist_data;
1957 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
1958 goto out; /* caller will populate */
1960 if (flags & HIST_FIELD_FL_VAR_REF) {
1961 hist_field->fn_num = HIST_FIELD_FN_VAR_REF;
1965 if (flags & HIST_FIELD_FL_HITCOUNT) {
1966 hist_field->fn_num = HIST_FIELD_FN_COUNTER;
1967 hist_field->size = sizeof(u64);
1968 hist_field->type = "u64";
1972 if (flags & HIST_FIELD_FL_CONST) {
1973 hist_field->fn_num = HIST_FIELD_FN_CONST;
1974 hist_field->size = sizeof(u64);
1975 hist_field->type = kstrdup("u64", GFP_KERNEL);
1976 if (!hist_field->type)
1981 if (flags & HIST_FIELD_FL_STACKTRACE) {
1983 hist_field->fn_num = HIST_FIELD_FN_STACK;
1985 hist_field->fn_num = HIST_FIELD_FN_NOP;
1986 hist_field->size = HIST_STACKTRACE_SIZE;
1987 hist_field->type = kstrdup_const("unsigned long[]", GFP_KERNEL);
1988 if (!hist_field->type)
1993 if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
1994 unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
1995 hist_field->fn_num = flags & HIST_FIELD_FL_LOG2 ? HIST_FIELD_FN_LOG2 :
1996 HIST_FIELD_FN_BUCKET;
1997 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
1998 if (!hist_field->operands[0])
2000 hist_field->size = hist_field->operands[0]->size;
2001 hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
2002 if (!hist_field->type)
2007 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2008 hist_field->fn_num = HIST_FIELD_FN_TIMESTAMP;
2009 hist_field->size = sizeof(u64);
2010 hist_field->type = "u64";
2014 if (flags & HIST_FIELD_FL_CPU) {
2015 hist_field->fn_num = HIST_FIELD_FN_CPU;
2016 hist_field->size = sizeof(int);
2017 hist_field->type = "unsigned int";
2021 if (WARN_ON_ONCE(!field))
2024 /* Pointers to strings are just pointers and dangerous to dereference */
2025 if (is_string_field(field) &&
2026 (field->filter_type != FILTER_PTR_STRING)) {
2027 flags |= HIST_FIELD_FL_STRING;
2029 hist_field->size = MAX_FILTER_STR_VAL;
2030 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
2031 if (!hist_field->type)
2034 if (field->filter_type == FILTER_STATIC_STRING) {
2035 hist_field->fn_num = HIST_FIELD_FN_STRING;
2036 hist_field->size = field->size;
2037 } else if (field->filter_type == FILTER_DYN_STRING) {
2038 hist_field->fn_num = HIST_FIELD_FN_DYNSTRING;
2039 } else if (field->filter_type == FILTER_RDYN_STRING)
2040 hist_field->fn_num = HIST_FIELD_FN_RELDYNSTRING;
2042 hist_field->fn_num = HIST_FIELD_FN_PSTRING;
2044 hist_field->size = field->size;
2045 hist_field->is_signed = field->is_signed;
2046 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
2047 if (!hist_field->type)
2050 hist_field->fn_num = select_value_fn(field->size,
2052 if (hist_field->fn_num == HIST_FIELD_FN_NOP) {
2053 destroy_hist_field(hist_field, 0);
2058 hist_field->field = field;
2059 hist_field->flags = flags;
2062 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2063 if (!hist_field->var.name)
2069 destroy_hist_field(hist_field, 0);
2073 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2077 for (i = 0; i < HIST_FIELDS_MAX; i++) {
2078 if (hist_data->fields[i]) {
2079 destroy_hist_field(hist_data->fields[i], 0);
2080 hist_data->fields[i] = NULL;
2084 for (i = 0; i < hist_data->n_var_refs; i++) {
2085 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2086 __destroy_hist_field(hist_data->var_refs[i]);
2087 hist_data->var_refs[i] = NULL;
2091 static int init_var_ref(struct hist_field *ref_field,
2092 struct hist_field *var_field,
2093 char *system, char *event_name)
2097 ref_field->var.idx = var_field->var.idx;
2098 ref_field->var.hist_data = var_field->hist_data;
2099 ref_field->size = var_field->size;
2100 ref_field->is_signed = var_field->is_signed;
2101 ref_field->flags |= var_field->flags &
2102 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2105 ref_field->system = kstrdup(system, GFP_KERNEL);
2106 if (!ref_field->system)
2111 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2112 if (!ref_field->event_name) {
2118 if (var_field->var.name) {
2119 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2120 if (!ref_field->name) {
2124 } else if (var_field->name) {
2125 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2126 if (!ref_field->name) {
2132 ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL);
2133 if (!ref_field->type) {
2140 kfree(ref_field->system);
2141 ref_field->system = NULL;
2142 kfree(ref_field->event_name);
2143 ref_field->event_name = NULL;
2144 kfree(ref_field->name);
2145 ref_field->name = NULL;
2150 static int find_var_ref_idx(struct hist_trigger_data *hist_data,
2151 struct hist_field *var_field)
2153 struct hist_field *ref_field;
2156 for (i = 0; i < hist_data->n_var_refs; i++) {
2157 ref_field = hist_data->var_refs[i];
2158 if (ref_field->var.idx == var_field->var.idx &&
2159 ref_field->var.hist_data == var_field->hist_data)
2167 * create_var_ref - Create a variable reference and attach it to trigger
2168 * @hist_data: The trigger that will be referencing the variable
2169 * @var_field: The VAR field to create a reference to
2170 * @system: The optional system string
2171 * @event_name: The optional event_name string
2173 * Given a variable hist_field, create a VAR_REF hist_field that
2174 * represents a reference to it.
2176 * This function also adds the reference to the trigger that
2177 * now references the variable.
2179 * Return: The VAR_REF field if successful, NULL if not
2181 static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2182 struct hist_field *var_field,
2183 char *system, char *event_name)
2185 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2186 struct hist_field *ref_field;
2189 /* Check if the variable already exists */
2190 for (i = 0; i < hist_data->n_var_refs; i++) {
2191 ref_field = hist_data->var_refs[i];
2192 if (ref_field->var.idx == var_field->var.idx &&
2193 ref_field->var.hist_data == var_field->hist_data) {
2194 get_hist_field(ref_field);
2198 /* Sanity check to avoid out-of-bound write on 'hist_data->var_refs' */
2199 if (hist_data->n_var_refs >= TRACING_MAP_VARS_MAX)
2201 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2203 if (init_var_ref(ref_field, var_field, system, event_name)) {
2204 destroy_hist_field(ref_field, 0);
2208 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2209 ref_field->var_ref_idx = hist_data->n_var_refs++;
2215 static bool is_var_ref(char *var_name)
2217 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2223 static char *field_name_from_var(struct hist_trigger_data *hist_data,
2229 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2230 name = hist_data->attrs->var_defs.name[i];
2232 if (strcmp(var_name, name) == 0) {
2233 field = hist_data->attrs->var_defs.expr[i];
2234 if (contains_operator(field, NULL) || is_var_ref(field))
2243 static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2244 char *system, char *event_name,
2247 struct trace_event_call *call;
2249 if (system && event_name) {
2250 call = hist_data->event_file->event_call;
2252 if (strcmp(system, call->class->system) != 0)
2255 if (strcmp(event_name, trace_event_name(call)) != 0)
2259 if (!!system != !!event_name)
2262 if (!is_var_ref(var_name))
2267 return field_name_from_var(hist_data, var_name);
2270 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2271 char *system, char *event_name,
2274 struct hist_field *var_field = NULL, *ref_field = NULL;
2275 struct trace_array *tr = hist_data->event_file->tr;
2277 if (!is_var_ref(var_name))
2282 var_field = find_event_var(hist_data, system, event_name, var_name);
2284 ref_field = create_var_ref(hist_data, var_field,
2285 system, event_name);
2288 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
2293 static struct ftrace_event_field *
2294 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2295 char *field_str, unsigned long *flags, unsigned long *buckets)
2297 struct ftrace_event_field *field = NULL;
2298 char *field_name, *modifier, *str;
2299 struct trace_array *tr = file->tr;
2301 modifier = str = kstrdup(field_str, GFP_KERNEL);
2303 return ERR_PTR(-ENOMEM);
2305 field_name = strsep(&modifier, ".");
2307 if (strcmp(modifier, "hex") == 0)
2308 *flags |= HIST_FIELD_FL_HEX;
2309 else if (strcmp(modifier, "sym") == 0)
2310 *flags |= HIST_FIELD_FL_SYM;
2312 * 'sym-offset' occurrences in the trigger string are modified
2313 * to 'symXoffset' to simplify arithmetic expression parsing.
2315 else if (strcmp(modifier, "symXoffset") == 0)
2316 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2317 else if ((strcmp(modifier, "execname") == 0) &&
2318 (strcmp(field_name, "common_pid") == 0))
2319 *flags |= HIST_FIELD_FL_EXECNAME;
2320 else if (strcmp(modifier, "syscall") == 0)
2321 *flags |= HIST_FIELD_FL_SYSCALL;
2322 else if (strcmp(modifier, "stacktrace") == 0)
2323 *flags |= HIST_FIELD_FL_STACKTRACE;
2324 else if (strcmp(modifier, "log2") == 0)
2325 *flags |= HIST_FIELD_FL_LOG2;
2326 else if (strcmp(modifier, "usecs") == 0)
2327 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2328 else if (strncmp(modifier, "bucket", 6) == 0) {
2333 if (*modifier == 's')
2335 if (*modifier != '=')
2338 ret = kstrtoul(modifier, 0, buckets);
2339 if (ret || !(*buckets))
2341 *flags |= HIST_FIELD_FL_BUCKET;
2342 } else if (strncmp(modifier, "percent", 7) == 0) {
2343 if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
2345 *flags |= HIST_FIELD_FL_PERCENT;
2346 } else if (strncmp(modifier, "graph", 5) == 0) {
2347 if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
2349 *flags |= HIST_FIELD_FL_GRAPH;
2352 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
2353 field = ERR_PTR(-EINVAL);
2358 if (strcmp(field_name, "common_timestamp") == 0) {
2359 *flags |= HIST_FIELD_FL_TIMESTAMP;
2360 hist_data->enable_timestamps = true;
2361 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2362 hist_data->attrs->ts_in_usecs = true;
2363 } else if (strcmp(field_name, "common_stacktrace") == 0) {
2364 *flags |= HIST_FIELD_FL_STACKTRACE;
2365 } else if (strcmp(field_name, "common_cpu") == 0)
2366 *flags |= HIST_FIELD_FL_CPU;
2367 else if (strcmp(field_name, "hitcount") == 0)
2368 *flags |= HIST_FIELD_FL_HITCOUNT;
2370 field = trace_find_event_field(file->event_call, field_name);
2371 if (!field || !field->size) {
2373 * For backward compatibility, if field_name
2374 * was "cpu" or "stacktrace", then we treat this
2375 * the same as common_cpu and common_stacktrace
2376 * respectively. This also works for "CPU", and
2379 if (field && field->filter_type == FILTER_CPU) {
2380 *flags |= HIST_FIELD_FL_CPU;
2381 } else if (field && field->filter_type == FILTER_STACKTRACE) {
2382 *flags |= HIST_FIELD_FL_STACKTRACE;
2384 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND,
2385 errpos(field_name));
2386 field = ERR_PTR(-EINVAL);
2397 static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2398 struct hist_field *var_ref,
2401 struct hist_field *alias = NULL;
2402 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2404 alias = create_hist_field(hist_data, NULL, flags, var_name);
2408 alias->fn_num = var_ref->fn_num;
2409 alias->operands[0] = var_ref;
2411 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2412 destroy_hist_field(alias, 0);
2416 alias->var_ref_idx = var_ref->var_ref_idx;
2421 static struct hist_field *parse_const(struct hist_trigger_data *hist_data,
2422 char *str, char *var_name,
2423 unsigned long *flags)
2425 struct trace_array *tr = hist_data->event_file->tr;
2426 struct hist_field *field = NULL;
2429 if (kstrtoull(str, 0, &constant)) {
2430 hist_err(tr, HIST_ERR_EXPECT_NUMBER, errpos(str));
2434 *flags |= HIST_FIELD_FL_CONST;
2435 field = create_hist_field(hist_data, NULL, *flags, var_name);
2439 field->constant = constant;
2444 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2445 struct trace_event_file *file, char *str,
2446 unsigned long *flags, char *var_name)
2448 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
2449 struct ftrace_event_field *field = NULL;
2450 struct hist_field *hist_field = NULL;
2451 unsigned long buckets = 0;
2454 if (isdigit(str[0])) {
2455 hist_field = parse_const(hist_data, str, var_name, flags);
2463 s = strchr(str, '.');
2465 s = strchr(++s, '.');
2467 ref_system = strsep(&str, ".");
2472 ref_event = strsep(&str, ".");
2481 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2483 hist_field = parse_var_ref(hist_data, ref_system,
2484 ref_event, ref_var);
2487 hist_field = create_alias(hist_data, hist_field, var_name);
2498 field = parse_field(hist_data, file, str, flags, &buckets);
2499 if (IS_ERR(field)) {
2500 ret = PTR_ERR(field);
2504 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2509 hist_field->buckets = buckets;
2513 return ERR_PTR(ret);
2516 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2517 struct trace_event_file *file,
2518 char *str, unsigned long flags,
2519 char *var_name, unsigned int *n_subexprs);
2521 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2522 struct trace_event_file *file,
2523 char *str, unsigned long flags,
2524 char *var_name, unsigned int *n_subexprs)
2526 struct hist_field *operand1, *expr = NULL;
2527 unsigned long operand_flags;
2531 /* Unary minus operator, increment n_subexprs */
2534 /* we support only -(xxx) i.e. explicit parens required */
2536 if (*n_subexprs > 3) {
2537 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2542 str++; /* skip leading '-' */
2544 s = strchr(str, '(');
2552 s = strrchr(str, ')');
2554 /* unary minus not supported in sub-expressions */
2555 if (*(s+1) != '\0') {
2556 hist_err(file->tr, HIST_ERR_UNARY_MINUS_SUBEXPR,
2564 ret = -EINVAL; /* no closing ')' */
2568 flags |= HIST_FIELD_FL_EXPR;
2569 expr = create_hist_field(hist_data, NULL, flags, var_name);
2576 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs);
2577 if (IS_ERR(operand1)) {
2578 ret = PTR_ERR(operand1);
2581 if (operand1->flags & HIST_FIELD_FL_STRING) {
2582 /* String type can not be the operand of unary operator. */
2583 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2584 destroy_hist_field(operand1, 0);
2589 expr->flags |= operand1->flags &
2590 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2591 expr->fn_num = HIST_FIELD_FN_UMINUS;
2592 expr->operands[0] = operand1;
2593 expr->size = operand1->size;
2594 expr->is_signed = operand1->is_signed;
2595 expr->operator = FIELD_OP_UNARY_MINUS;
2596 expr->name = expr_str(expr, 0);
2597 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
2605 destroy_hist_field(expr, 0);
2606 return ERR_PTR(ret);
2610 * If the operands are var refs, return pointers the
2611 * variable(s) referenced in var1 and var2, else NULL.
2613 static int check_expr_operands(struct trace_array *tr,
2614 struct hist_field *operand1,
2615 struct hist_field *operand2,
2616 struct hist_field **var1,
2617 struct hist_field **var2)
2619 unsigned long operand1_flags = operand1->flags;
2620 unsigned long operand2_flags = operand2->flags;
2622 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2623 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2624 struct hist_field *var;
2626 var = find_var_field(operand1->var.hist_data, operand1->name);
2629 operand1_flags = var->flags;
2633 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2634 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2635 struct hist_field *var;
2637 var = find_var_field(operand2->var.hist_data, operand2->name);
2640 operand2_flags = var->flags;
2644 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
2645 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
2646 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
2653 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2654 struct trace_event_file *file,
2655 char *str, unsigned long flags,
2656 char *var_name, unsigned int *n_subexprs)
2658 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2659 struct hist_field *var1 = NULL, *var2 = NULL;
2660 unsigned long operand_flags, operand2_flags;
2661 int field_op, ret = -EINVAL;
2662 char *sep, *operand1_str;
2663 enum hist_field_fn op_fn;
2664 bool combine_consts;
2666 if (*n_subexprs > 3) {
2667 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2668 return ERR_PTR(-EINVAL);
2671 field_op = contains_operator(str, &sep);
2673 if (field_op == FIELD_OP_NONE)
2674 return parse_atom(hist_data, file, str, &flags, var_name);
2676 if (field_op == FIELD_OP_UNARY_MINUS)
2677 return parse_unary(hist_data, file, str, flags, var_name, n_subexprs);
2679 /* Binary operator found, increment n_subexprs */
2682 /* Split the expression string at the root operator */
2684 return ERR_PTR(-EINVAL);
2690 /* Binary operator requires both operands */
2691 if (*operand1_str == '\0' || *str == '\0')
2692 return ERR_PTR(-EINVAL);
2696 /* LHS of string is an expression e.g. a+b in a+b+c */
2697 operand1 = parse_expr(hist_data, file, operand1_str, operand_flags, NULL, n_subexprs);
2698 if (IS_ERR(operand1))
2699 return ERR_CAST(operand1);
2701 if (operand1->flags & HIST_FIELD_FL_STRING) {
2702 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str));
2707 /* RHS of string is another expression e.g. c in a+b+c */
2709 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, n_subexprs);
2710 if (IS_ERR(operand2)) {
2711 ret = PTR_ERR(operand2);
2714 if (operand2->flags & HIST_FIELD_FL_STRING) {
2715 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2721 case FIELD_OP_MINUS:
2722 op_fn = HIST_FIELD_FN_MINUS;
2725 op_fn = HIST_FIELD_FN_PLUS;
2728 op_fn = HIST_FIELD_FN_DIV;
2731 op_fn = HIST_FIELD_FN_MULT;
2738 ret = check_expr_operands(file->tr, operand1, operand2, &var1, &var2);
2742 operand_flags = var1 ? var1->flags : operand1->flags;
2743 operand2_flags = var2 ? var2->flags : operand2->flags;
2746 * If both operands are constant, the expression can be
2747 * collapsed to a single constant.
2749 combine_consts = operand_flags & operand2_flags & HIST_FIELD_FL_CONST;
2751 flags |= combine_consts ? HIST_FIELD_FL_CONST : HIST_FIELD_FL_EXPR;
2753 flags |= operand1->flags &
2754 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2756 expr = create_hist_field(hist_data, NULL, flags, var_name);
2762 operand1->read_once = true;
2763 operand2->read_once = true;
2765 /* The operands are now owned and free'd by 'expr' */
2766 expr->operands[0] = operand1;
2767 expr->operands[1] = operand2;
2769 if (field_op == FIELD_OP_DIV &&
2770 operand2_flags & HIST_FIELD_FL_CONST) {
2771 u64 divisor = var2 ? var2->constant : operand2->constant;
2774 hist_err(file->tr, HIST_ERR_DIVISION_BY_ZERO, errpos(str));
2780 * Copy the divisor here so we don't have to look it up
2781 * later if this is a var ref
2783 operand2->constant = divisor;
2784 op_fn = hist_field_get_div_fn(operand2);
2787 expr->fn_num = op_fn;
2789 if (combine_consts) {
2791 expr->operands[0] = var1;
2793 expr->operands[1] = var2;
2795 expr->constant = hist_fn_call(expr, NULL, NULL, NULL, NULL);
2796 expr->fn_num = HIST_FIELD_FN_CONST;
2798 expr->operands[0] = NULL;
2799 expr->operands[1] = NULL;
2802 * var refs won't be destroyed immediately
2803 * See: destroy_hist_field()
2805 destroy_hist_field(operand2, 0);
2806 destroy_hist_field(operand1, 0);
2808 expr->name = expr_str(expr, 0);
2810 /* The operand sizes should be the same, so just pick one */
2811 expr->size = operand1->size;
2812 expr->is_signed = operand1->is_signed;
2814 expr->operator = field_op;
2815 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
2821 expr->name = expr_str(expr, 0);
2827 destroy_hist_field(operand2, 0);
2829 destroy_hist_field(operand1, 0);
2830 return ERR_PTR(ret);
2833 destroy_hist_field(expr, 0);
2834 return ERR_PTR(ret);
2837 static char *find_trigger_filter(struct hist_trigger_data *hist_data,
2838 struct trace_event_file *file)
2840 struct event_trigger_data *test;
2842 lockdep_assert_held(&event_mutex);
2844 list_for_each_entry(test, &file->triggers, list) {
2845 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2846 if (test->private_data == hist_data)
2847 return test->filter_str;
2854 static struct event_command trigger_hist_cmd;
2855 static int event_hist_trigger_parse(struct event_command *cmd_ops,
2856 struct trace_event_file *file,
2857 char *glob, char *cmd,
2858 char *param_and_filter);
2860 static bool compatible_keys(struct hist_trigger_data *target_hist_data,
2861 struct hist_trigger_data *hist_data,
2862 unsigned int n_keys)
2864 struct hist_field *target_hist_field, *hist_field;
2865 unsigned int n, i, j;
2867 if (hist_data->n_fields - hist_data->n_vals != n_keys)
2870 i = hist_data->n_vals;
2871 j = target_hist_data->n_vals;
2873 for (n = 0; n < n_keys; n++) {
2874 hist_field = hist_data->fields[i + n];
2875 target_hist_field = target_hist_data->fields[j + n];
2877 if (strcmp(hist_field->type, target_hist_field->type) != 0)
2879 if (hist_field->size != target_hist_field->size)
2881 if (hist_field->is_signed != target_hist_field->is_signed)
2888 static struct hist_trigger_data *
2889 find_compatible_hist(struct hist_trigger_data *target_hist_data,
2890 struct trace_event_file *file)
2892 struct hist_trigger_data *hist_data;
2893 struct event_trigger_data *test;
2894 unsigned int n_keys;
2896 lockdep_assert_held(&event_mutex);
2898 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
2900 list_for_each_entry(test, &file->triggers, list) {
2901 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2902 hist_data = test->private_data;
2904 if (compatible_keys(target_hist_data, hist_data, n_keys))
2912 static struct trace_event_file *event_file(struct trace_array *tr,
2913 char *system, char *event_name)
2915 struct trace_event_file *file;
2917 file = __find_event_file(tr, system, event_name);
2919 return ERR_PTR(-EINVAL);
2924 static struct hist_field *
2925 find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
2926 char *system, char *event_name, char *field_name)
2928 struct hist_field *event_var;
2929 char *synthetic_name;
2931 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2932 if (!synthetic_name)
2933 return ERR_PTR(-ENOMEM);
2935 strcpy(synthetic_name, "synthetic_");
2936 strcat(synthetic_name, field_name);
2938 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
2940 kfree(synthetic_name);
2946 * create_field_var_hist - Automatically create a histogram and var for a field
2947 * @target_hist_data: The target hist trigger
2948 * @subsys_name: Optional subsystem name
2949 * @event_name: Optional event name
2950 * @field_name: The name of the field (and the resulting variable)
2952 * Hist trigger actions fetch data from variables, not directly from
2953 * events. However, for convenience, users are allowed to directly
2954 * specify an event field in an action, which will be automatically
2955 * converted into a variable on their behalf.
2957 * If a user specifies a field on an event that isn't the event the
2958 * histogram currently being defined (the target event histogram), the
2959 * only way that can be accomplished is if a new hist trigger is
2960 * created and the field variable defined on that.
2962 * This function creates a new histogram compatible with the target
2963 * event (meaning a histogram with the same key as the target
2964 * histogram), and creates a variable for the specified field, but
2965 * with 'synthetic_' prepended to the variable name in order to avoid
2966 * collision with normal field variables.
2968 * Return: The variable created for the field.
2970 static struct hist_field *
2971 create_field_var_hist(struct hist_trigger_data *target_hist_data,
2972 char *subsys_name, char *event_name, char *field_name)
2974 struct trace_array *tr = target_hist_data->event_file->tr;
2975 struct hist_trigger_data *hist_data;
2976 unsigned int i, n, first = true;
2977 struct field_var_hist *var_hist;
2978 struct trace_event_file *file;
2979 struct hist_field *key_field;
2980 struct hist_field *event_var;
2985 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
2986 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
2987 return ERR_PTR(-EINVAL);
2990 file = event_file(tr, subsys_name, event_name);
2993 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
2994 ret = PTR_ERR(file);
2995 return ERR_PTR(ret);
2999 * Look for a histogram compatible with target. We'll use the
3000 * found histogram specification to create a new matching
3001 * histogram with our variable on it. target_hist_data is not
3002 * yet a registered histogram so we can't use that.
3004 hist_data = find_compatible_hist(target_hist_data, file);
3006 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
3007 return ERR_PTR(-EINVAL);
3010 /* See if a synthetic field variable has already been created */
3011 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3012 event_name, field_name);
3013 if (!IS_ERR_OR_NULL(event_var))
3016 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3018 return ERR_PTR(-ENOMEM);
3020 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3023 return ERR_PTR(-ENOMEM);
3026 /* Use the same keys as the compatible histogram */
3027 strcat(cmd, "keys=");
3029 for_each_hist_key_field(i, hist_data) {
3030 key_field = hist_data->fields[i];
3033 strcat(cmd, key_field->field->name);
3037 /* Create the synthetic field variable specification */
3038 strcat(cmd, ":synthetic_");
3039 strcat(cmd, field_name);
3041 strcat(cmd, field_name);
3043 /* Use the same filter as the compatible histogram */
3044 saved_filter = find_trigger_filter(hist_data, file);
3046 strcat(cmd, " if ");
3047 strcat(cmd, saved_filter);
3050 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3051 if (!var_hist->cmd) {
3054 return ERR_PTR(-ENOMEM);
3057 /* Save the compatible histogram information */
3058 var_hist->hist_data = hist_data;
3060 /* Create the new histogram with our variable */
3061 ret = event_hist_trigger_parse(&trigger_hist_cmd, file,
3065 kfree(var_hist->cmd);
3067 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
3068 return ERR_PTR(ret);
3073 /* If we can't find the variable, something went wrong */
3074 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3075 event_name, field_name);
3076 if (IS_ERR_OR_NULL(event_var)) {
3077 kfree(var_hist->cmd);
3079 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
3080 return ERR_PTR(-EINVAL);
3083 n = target_hist_data->n_field_var_hists;
3084 target_hist_data->field_var_hists[n] = var_hist;
3085 target_hist_data->n_field_var_hists++;
3090 static struct hist_field *
3091 find_target_event_var(struct hist_trigger_data *hist_data,
3092 char *subsys_name, char *event_name, char *var_name)
3094 struct trace_event_file *file = hist_data->event_file;
3095 struct hist_field *hist_field = NULL;
3098 struct trace_event_call *call;
3103 call = file->event_call;
3105 if (strcmp(subsys_name, call->class->system) != 0)
3108 if (strcmp(event_name, trace_event_name(call)) != 0)
3112 hist_field = find_var_field(hist_data, var_name);
3117 static inline void __update_field_vars(struct tracing_map_elt *elt,
3118 struct trace_buffer *buffer,
3119 struct ring_buffer_event *rbe,
3121 struct field_var **field_vars,
3122 unsigned int n_field_vars,
3123 unsigned int field_var_str_start)
3125 struct hist_elt_data *elt_data = elt->private_data;
3126 unsigned int i, j, var_idx;
3129 /* Make sure stacktrace can fit in the string variable length */
3130 BUILD_BUG_ON((HIST_STACKTRACE_DEPTH + 1) * sizeof(long) >= STR_VAR_LEN_MAX);
3132 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3133 struct field_var *field_var = field_vars[i];
3134 struct hist_field *var = field_var->var;
3135 struct hist_field *val = field_var->val;
3137 var_val = hist_fn_call(val, elt, buffer, rbe, rec);
3138 var_idx = var->var.idx;
3140 if (val->flags & (HIST_FIELD_FL_STRING |
3141 HIST_FIELD_FL_STACKTRACE)) {
3142 char *str = elt_data->field_var_str[j++];
3143 char *val_str = (char *)(uintptr_t)var_val;
3146 if (val->flags & HIST_FIELD_FL_STRING) {
3147 size = min(val->size, STR_VAR_LEN_MAX);
3148 strscpy(str, val_str, size);
3150 char *stack_start = str + sizeof(unsigned long);
3153 e = stack_trace_save((void *)stack_start,
3154 HIST_STACKTRACE_DEPTH,
3155 HIST_STACKTRACE_SKIP);
3156 if (e < HIST_STACKTRACE_DEPTH - 1)
3157 ((unsigned long *)stack_start)[e] = 0;
3158 *((unsigned long *)str) = e;
3160 var_val = (u64)(uintptr_t)str;
3162 tracing_map_set_var(elt, var_idx, var_val);
3166 static void update_field_vars(struct hist_trigger_data *hist_data,
3167 struct tracing_map_elt *elt,
3168 struct trace_buffer *buffer,
3169 struct ring_buffer_event *rbe,
3172 __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars,
3173 hist_data->n_field_vars, 0);
3176 static void save_track_data_vars(struct hist_trigger_data *hist_data,
3177 struct tracing_map_elt *elt,
3178 struct trace_buffer *buffer, void *rec,
3179 struct ring_buffer_event *rbe, void *key,
3180 struct action_data *data, u64 *var_ref_vals)
3182 __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars,
3183 hist_data->n_save_vars, hist_data->n_field_var_str);
3186 static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3187 struct trace_event_file *file,
3188 char *name, int size, const char *type)
3190 struct hist_field *var;
3193 if (find_var(hist_data, file, name) && !hist_data->remove) {
3194 var = ERR_PTR(-EINVAL);
3198 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3200 var = ERR_PTR(-ENOMEM);
3204 idx = tracing_map_add_var(hist_data->map);
3207 var = ERR_PTR(-EINVAL);
3212 var->flags = HIST_FIELD_FL_VAR;
3214 var->var.hist_data = var->hist_data = hist_data;
3216 var->var.name = kstrdup(name, GFP_KERNEL);
3217 var->type = kstrdup_const(type, GFP_KERNEL);
3218 if (!var->var.name || !var->type) {
3219 kfree_const(var->type);
3220 kfree(var->var.name);
3222 var = ERR_PTR(-ENOMEM);
3228 static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3229 struct trace_event_file *file,
3232 struct hist_field *val = NULL, *var = NULL;
3233 unsigned long flags = HIST_FIELD_FL_VAR;
3234 struct trace_array *tr = file->tr;
3235 struct field_var *field_var;
3238 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
3239 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
3244 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3246 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
3251 var = create_var(hist_data, file, field_name, val->size, val->type);
3253 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
3259 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3267 field_var->var = var;
3268 field_var->val = val;
3272 field_var = ERR_PTR(ret);
3277 * create_target_field_var - Automatically create a variable for a field
3278 * @target_hist_data: The target hist trigger
3279 * @subsys_name: Optional subsystem name
3280 * @event_name: Optional event name
3281 * @var_name: The name of the field (and the resulting variable)
3283 * Hist trigger actions fetch data from variables, not directly from
3284 * events. However, for convenience, users are allowed to directly
3285 * specify an event field in an action, which will be automatically
3286 * converted into a variable on their behalf.
3288 * This function creates a field variable with the name var_name on
3289 * the hist trigger currently being defined on the target event. If
3290 * subsys_name and event_name are specified, this function simply
3291 * verifies that they do in fact match the target event subsystem and
3294 * Return: The variable created for the field.
3296 static struct field_var *
3297 create_target_field_var(struct hist_trigger_data *target_hist_data,
3298 char *subsys_name, char *event_name, char *var_name)
3300 struct trace_event_file *file = target_hist_data->event_file;
3303 struct trace_event_call *call;
3308 call = file->event_call;
3310 if (strcmp(subsys_name, call->class->system) != 0)
3313 if (strcmp(event_name, trace_event_name(call)) != 0)
3317 return create_field_var(target_hist_data, file, var_name);
3320 static bool check_track_val_max(u64 track_val, u64 var_val)
3322 if (var_val <= track_val)
3328 static bool check_track_val_changed(u64 track_val, u64 var_val)
3330 if (var_val == track_val)
3336 static u64 get_track_val(struct hist_trigger_data *hist_data,
3337 struct tracing_map_elt *elt,
3338 struct action_data *data)
3340 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3343 track_val = tracing_map_read_var(elt, track_var_idx);
3348 static void save_track_val(struct hist_trigger_data *hist_data,
3349 struct tracing_map_elt *elt,
3350 struct action_data *data, u64 var_val)
3352 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3354 tracing_map_set_var(elt, track_var_idx, var_val);
3357 static void save_track_data(struct hist_trigger_data *hist_data,
3358 struct tracing_map_elt *elt,
3359 struct trace_buffer *buffer, void *rec,
3360 struct ring_buffer_event *rbe, void *key,
3361 struct action_data *data, u64 *var_ref_vals)
3363 if (data->track_data.save_data)
3364 data->track_data.save_data(hist_data, elt, buffer, rec, rbe,
3365 key, data, var_ref_vals);
3368 static bool check_track_val(struct tracing_map_elt *elt,
3369 struct action_data *data,
3372 struct hist_trigger_data *hist_data;
3375 hist_data = data->track_data.track_var->hist_data;
3376 track_val = get_track_val(hist_data, elt, data);
3378 return data->track_data.check_val(track_val, var_val);
3381 #ifdef CONFIG_TRACER_SNAPSHOT
3382 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3384 /* called with tr->max_lock held */
3385 struct track_data *track_data = tr->cond_snapshot->cond_data;
3386 struct hist_elt_data *elt_data, *track_elt_data;
3387 struct snapshot_context *context = cond_data;
3388 struct action_data *action;
3394 action = track_data->action_data;
3396 track_val = get_track_val(track_data->hist_data, context->elt,
3397 track_data->action_data);
3399 if (!action->track_data.check_val(track_data->track_val, track_val))
3402 track_data->track_val = track_val;
3403 memcpy(track_data->key, context->key, track_data->key_len);
3405 elt_data = context->elt->private_data;
3406 track_elt_data = track_data->elt.private_data;
3408 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
3410 track_data->updated = true;
3415 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3416 struct tracing_map_elt *elt,
3417 struct trace_buffer *buffer, void *rec,
3418 struct ring_buffer_event *rbe, void *key,
3419 struct action_data *data,
3422 struct trace_event_file *file = hist_data->event_file;
3423 struct snapshot_context context;
3428 tracing_snapshot_cond(file->tr, &context);
3431 static void hist_trigger_print_key(struct seq_file *m,
3432 struct hist_trigger_data *hist_data,
3434 struct tracing_map_elt *elt);
3436 static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3440 if (!hist_data->n_actions)
3443 for (i = 0; i < hist_data->n_actions; i++) {
3444 struct action_data *data = hist_data->actions[i];
3446 if (data->action == ACTION_SNAPSHOT)
3453 static void track_data_snapshot_print(struct seq_file *m,
3454 struct hist_trigger_data *hist_data)
3456 struct trace_event_file *file = hist_data->event_file;
3457 struct track_data *track_data;
3458 struct action_data *action;
3460 track_data = tracing_cond_snapshot_data(file->tr);
3464 if (!track_data->updated)
3467 action = snapshot_action(hist_data);
3471 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3472 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3473 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3474 action->track_data.var_str, track_data->track_val);
3476 seq_puts(m, "\ttriggered by event with key: ");
3477 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3481 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3485 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3486 struct tracing_map_elt *elt,
3487 struct trace_buffer *buffer, void *rec,
3488 struct ring_buffer_event *rbe, void *key,
3489 struct action_data *data,
3490 u64 *var_ref_vals) {}
3491 static void track_data_snapshot_print(struct seq_file *m,
3492 struct hist_trigger_data *hist_data) {}
3493 #endif /* CONFIG_TRACER_SNAPSHOT */
3495 static void track_data_print(struct seq_file *m,
3496 struct hist_trigger_data *hist_data,
3497 struct tracing_map_elt *elt,
3498 struct action_data *data)
3500 u64 track_val = get_track_val(hist_data, elt, data);
3501 unsigned int i, save_var_idx;
3503 if (data->handler == HANDLER_ONMAX)
3504 seq_printf(m, "\n\tmax: %10llu", track_val);
3505 else if (data->handler == HANDLER_ONCHANGE)
3506 seq_printf(m, "\n\tchanged: %10llu", track_val);
3508 if (data->action == ACTION_SNAPSHOT)
3511 for (i = 0; i < hist_data->n_save_vars; i++) {
3512 struct hist_field *save_val = hist_data->save_vars[i]->val;
3513 struct hist_field *save_var = hist_data->save_vars[i]->var;
3516 save_var_idx = save_var->var.idx;
3518 val = tracing_map_read_var(elt, save_var_idx);
3520 if (save_val->flags & HIST_FIELD_FL_STRING) {
3521 seq_printf(m, " %s: %-32s", save_var->var.name,
3522 (char *)(uintptr_t)(val));
3524 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3528 static void ontrack_action(struct hist_trigger_data *hist_data,
3529 struct tracing_map_elt *elt,
3530 struct trace_buffer *buffer, void *rec,
3531 struct ring_buffer_event *rbe, void *key,
3532 struct action_data *data, u64 *var_ref_vals)
3534 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
3536 if (check_track_val(elt, data, var_val)) {
3537 save_track_val(hist_data, elt, data, var_val);
3538 save_track_data(hist_data, elt, buffer, rec, rbe,
3539 key, data, var_ref_vals);
3543 static void action_data_destroy(struct action_data *data)
3547 lockdep_assert_held(&event_mutex);
3549 kfree(data->action_name);
3551 for (i = 0; i < data->n_params; i++)
3552 kfree(data->params[i]);
3554 if (data->synth_event)
3555 data->synth_event->ref--;
3557 kfree(data->synth_event_name);
3562 static void track_data_destroy(struct hist_trigger_data *hist_data,
3563 struct action_data *data)
3565 struct trace_event_file *file = hist_data->event_file;
3567 destroy_hist_field(data->track_data.track_var, 0);
3569 if (data->action == ACTION_SNAPSHOT) {
3570 struct track_data *track_data;
3572 track_data = tracing_cond_snapshot_data(file->tr);
3573 if (track_data && track_data->hist_data == hist_data) {
3574 tracing_snapshot_cond_disable(file->tr);
3575 track_data_free(track_data);
3579 kfree(data->track_data.var_str);
3581 action_data_destroy(data);
3584 static int action_create(struct hist_trigger_data *hist_data,
3585 struct action_data *data);
3587 static int track_data_create(struct hist_trigger_data *hist_data,
3588 struct action_data *data)
3590 struct hist_field *var_field, *ref_field, *track_var = NULL;
3591 struct trace_event_file *file = hist_data->event_file;
3592 struct trace_array *tr = file->tr;
3593 char *track_data_var_str;
3596 track_data_var_str = data->track_data.var_str;
3597 if (track_data_var_str[0] != '$') {
3598 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
3601 track_data_var_str++;
3603 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
3605 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
3609 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
3613 data->track_data.var_ref = ref_field;
3615 if (data->handler == HANDLER_ONMAX)
3616 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3617 if (IS_ERR(track_var)) {
3618 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3619 ret = PTR_ERR(track_var);
3623 if (data->handler == HANDLER_ONCHANGE)
3624 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3625 if (IS_ERR(track_var)) {
3626 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3627 ret = PTR_ERR(track_var);
3630 data->track_data.track_var = track_var;
3632 ret = action_create(hist_data, data);
3637 static int parse_action_params(struct trace_array *tr, char *params,
3638 struct action_data *data)
3640 char *param, *saved_param;
3641 bool first_param = true;
3645 if (data->n_params >= SYNTH_FIELDS_MAX) {
3646 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
3651 param = strsep(¶ms, ",");
3653 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
3658 param = strstrip(param);
3659 if (strlen(param) < 2) {
3660 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
3665 saved_param = kstrdup(param, GFP_KERNEL);
3671 if (first_param && data->use_trace_keyword) {
3672 data->synth_event_name = saved_param;
3673 first_param = false;
3676 first_param = false;
3678 data->params[data->n_params++] = saved_param;
3684 static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
3685 enum handler_id handler)
3692 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3697 action_name = strsep(&str, "(");
3698 if (!action_name || !str) {
3699 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3704 if (str_has_prefix(action_name, "save")) {
3705 char *params = strsep(&str, ")");
3708 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
3713 ret = parse_action_params(tr, params, data);
3717 if (handler == HANDLER_ONMAX)
3718 data->track_data.check_val = check_track_val_max;
3719 else if (handler == HANDLER_ONCHANGE)
3720 data->track_data.check_val = check_track_val_changed;
3722 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3727 data->track_data.save_data = save_track_data_vars;
3728 data->fn = ontrack_action;
3729 data->action = ACTION_SAVE;
3730 } else if (str_has_prefix(action_name, "snapshot")) {
3731 char *params = strsep(&str, ")");
3734 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
3739 if (handler == HANDLER_ONMAX)
3740 data->track_data.check_val = check_track_val_max;
3741 else if (handler == HANDLER_ONCHANGE)
3742 data->track_data.check_val = check_track_val_changed;
3744 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3749 data->track_data.save_data = save_track_data_snapshot;
3750 data->fn = ontrack_action;
3751 data->action = ACTION_SNAPSHOT;
3753 char *params = strsep(&str, ")");
3755 if (str_has_prefix(action_name, "trace"))
3756 data->use_trace_keyword = true;
3759 ret = parse_action_params(tr, params, data);
3764 if (handler == HANDLER_ONMAX)
3765 data->track_data.check_val = check_track_val_max;
3766 else if (handler == HANDLER_ONCHANGE)
3767 data->track_data.check_val = check_track_val_changed;
3769 if (handler != HANDLER_ONMATCH) {
3770 data->track_data.save_data = action_trace;
3771 data->fn = ontrack_action;
3773 data->fn = action_trace;
3775 data->action = ACTION_TRACE;
3778 data->action_name = kstrdup(action_name, GFP_KERNEL);
3779 if (!data->action_name) {
3784 data->handler = handler;
3789 static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
3790 char *str, enum handler_id handler)
3792 struct action_data *data;
3796 data = kzalloc(sizeof(*data), GFP_KERNEL);
3798 return ERR_PTR(-ENOMEM);
3800 var_str = strsep(&str, ")");
3801 if (!var_str || !str) {
3806 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
3807 if (!data->track_data.var_str) {
3812 ret = action_parse(hist_data->event_file->tr, str, data, handler);
3818 track_data_destroy(hist_data, data);
3819 data = ERR_PTR(ret);
3823 static void onmatch_destroy(struct action_data *data)
3825 kfree(data->match_data.event);
3826 kfree(data->match_data.event_system);
3828 action_data_destroy(data);
3831 static void destroy_field_var(struct field_var *field_var)
3836 destroy_hist_field(field_var->var, 0);
3837 destroy_hist_field(field_var->val, 0);
3842 static void destroy_field_vars(struct hist_trigger_data *hist_data)
3846 for (i = 0; i < hist_data->n_field_vars; i++)
3847 destroy_field_var(hist_data->field_vars[i]);
3849 for (i = 0; i < hist_data->n_save_vars; i++)
3850 destroy_field_var(hist_data->save_vars[i]);
3853 static void save_field_var(struct hist_trigger_data *hist_data,
3854 struct field_var *field_var)
3856 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3858 /* Stack traces are saved in the string storage too */
3859 if (field_var->val->flags & (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE))
3860 hist_data->n_field_var_str++;
3864 static int check_synth_field(struct synth_event *event,
3865 struct hist_field *hist_field,
3866 unsigned int field_pos)
3868 struct synth_field *field;
3870 if (field_pos >= event->n_fields)
3873 field = event->fields[field_pos];
3876 * A dynamic string synth field can accept static or
3877 * dynamic. A static string synth field can only accept a
3878 * same-sized static string, which is checked for later.
3880 if (strstr(hist_field->type, "char[") && field->is_string
3881 && field->is_dynamic)
3884 if (strstr(hist_field->type, "long[") && field->is_stack)
3887 if (strcmp(field->type, hist_field->type) != 0) {
3888 if (field->size != hist_field->size ||
3889 (!field->is_string && field->is_signed != hist_field->is_signed))
3896 static struct hist_field *
3897 trace_action_find_var(struct hist_trigger_data *hist_data,
3898 struct action_data *data,
3899 char *system, char *event, char *var)
3901 struct trace_array *tr = hist_data->event_file->tr;
3902 struct hist_field *hist_field;
3904 var++; /* skip '$' */
3906 hist_field = find_target_event_var(hist_data, system, event, var);
3908 if (!system && data->handler == HANDLER_ONMATCH) {
3909 system = data->match_data.event_system;
3910 event = data->match_data.event;
3913 hist_field = find_event_var(hist_data, system, event, var);
3917 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
3922 static struct hist_field *
3923 trace_action_create_field_var(struct hist_trigger_data *hist_data,
3924 struct action_data *data, char *system,
3925 char *event, char *var)
3927 struct hist_field *hist_field = NULL;
3928 struct field_var *field_var;
3931 * First try to create a field var on the target event (the
3932 * currently being defined). This will create a variable for
3933 * unqualified fields on the target event, or if qualified,
3934 * target fields that have qualified names matching the target.
3936 field_var = create_target_field_var(hist_data, system, event, var);
3938 if (field_var && !IS_ERR(field_var)) {
3939 save_field_var(hist_data, field_var);
3940 hist_field = field_var->var;
3944 * If no explicit system.event is specified, default to
3945 * looking for fields on the onmatch(system.event.xxx)
3948 if (!system && data->handler == HANDLER_ONMATCH) {
3949 system = data->match_data.event_system;
3950 event = data->match_data.event;
3956 * At this point, we're looking at a field on another
3957 * event. Because we can't modify a hist trigger on
3958 * another event to add a variable for a field, we need
3959 * to create a new trigger on that event and create the
3960 * variable at the same time.
3962 hist_field = create_field_var_hist(hist_data, system, event, var);
3963 if (IS_ERR(hist_field))
3969 destroy_field_var(field_var);
3974 static int trace_action_create(struct hist_trigger_data *hist_data,
3975 struct action_data *data)
3977 struct trace_array *tr = hist_data->event_file->tr;
3978 char *event_name, *param, *system = NULL;
3979 struct hist_field *hist_field, *var_ref;
3981 unsigned int field_pos = 0;
3982 struct synth_event *event;
3983 char *synth_event_name;
3984 int var_ref_idx, ret = 0;
3986 lockdep_assert_held(&event_mutex);
3988 /* Sanity check to avoid out-of-bound write on 'data->var_ref_idx' */
3989 if (data->n_params > SYNTH_FIELDS_MAX)
3992 if (data->use_trace_keyword)
3993 synth_event_name = data->synth_event_name;
3995 synth_event_name = data->action_name;
3997 event = find_synth_event(synth_event_name);
3999 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
4005 for (i = 0; i < data->n_params; i++) {
4008 p = param = kstrdup(data->params[i], GFP_KERNEL);
4014 system = strsep(¶m, ".");
4016 param = (char *)system;
4017 system = event_name = NULL;
4019 event_name = strsep(¶m, ".");
4027 if (param[0] == '$')
4028 hist_field = trace_action_find_var(hist_data, data,
4032 hist_field = trace_action_create_field_var(hist_data,
4044 if (check_synth_field(event, hist_field, field_pos) == 0) {
4045 var_ref = create_var_ref(hist_data, hist_field,
4046 system, event_name);
4053 var_ref_idx = find_var_ref_idx(hist_data, var_ref);
4054 if (WARN_ON(var_ref_idx < 0)) {
4060 data->var_ref_idx[i] = var_ref_idx;
4067 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
4073 if (field_pos != event->n_fields) {
4074 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
4079 data->synth_event = event;
4088 static int action_create(struct hist_trigger_data *hist_data,
4089 struct action_data *data)
4091 struct trace_event_file *file = hist_data->event_file;
4092 struct trace_array *tr = file->tr;
4093 struct track_data *track_data;
4094 struct field_var *field_var;
4099 if (data->action == ACTION_TRACE)
4100 return trace_action_create(hist_data, data);
4102 if (data->action == ACTION_SNAPSHOT) {
4103 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4104 if (IS_ERR(track_data)) {
4105 ret = PTR_ERR(track_data);
4109 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4110 cond_snapshot_update);
4112 track_data_free(track_data);
4117 if (data->action == ACTION_SAVE) {
4118 if (hist_data->n_save_vars) {
4120 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
4124 for (i = 0; i < data->n_params; i++) {
4125 param = kstrdup(data->params[i], GFP_KERNEL);
4131 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4132 if (IS_ERR(field_var)) {
4133 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
4135 ret = PTR_ERR(field_var);
4140 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4141 if (field_var->val->flags &
4142 (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE))
4143 hist_data->n_save_var_str++;
4151 static int onmatch_create(struct hist_trigger_data *hist_data,
4152 struct action_data *data)
4154 return action_create(hist_data, data);
4157 static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4159 char *match_event, *match_event_system;
4160 struct action_data *data;
4163 data = kzalloc(sizeof(*data), GFP_KERNEL);
4165 return ERR_PTR(-ENOMEM);
4167 match_event = strsep(&str, ")");
4168 if (!match_event || !str) {
4169 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
4173 match_event_system = strsep(&match_event, ".");
4175 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
4179 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
4180 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
4184 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4185 if (!data->match_data.event) {
4190 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4191 if (!data->match_data.event_system) {
4196 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
4202 onmatch_destroy(data);
4203 data = ERR_PTR(ret);
4207 static int create_hitcount_val(struct hist_trigger_data *hist_data)
4209 hist_data->fields[HITCOUNT_IDX] =
4210 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
4211 if (!hist_data->fields[HITCOUNT_IDX])
4214 hist_data->n_vals++;
4215 hist_data->n_fields++;
4217 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4223 static int __create_val_field(struct hist_trigger_data *hist_data,
4224 unsigned int val_idx,
4225 struct trace_event_file *file,
4226 char *var_name, char *field_str,
4227 unsigned long flags)
4229 struct hist_field *hist_field;
4230 int ret = 0, n_subexprs = 0;
4232 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, &n_subexprs);
4233 if (IS_ERR(hist_field)) {
4234 ret = PTR_ERR(hist_field);
4238 /* values and variables should not have some modifiers */
4239 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4241 if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT |
4242 HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2))
4246 if (hist_field->flags & (HIST_FIELD_FL_GRAPH | HIST_FIELD_FL_PERCENT |
4247 HIST_FIELD_FL_BUCKET | HIST_FIELD_FL_LOG2 |
4248 HIST_FIELD_FL_SYM | HIST_FIELD_FL_SYM_OFFSET |
4249 HIST_FIELD_FL_SYSCALL | HIST_FIELD_FL_STACKTRACE))
4253 hist_data->fields[val_idx] = hist_field;
4255 ++hist_data->n_vals;
4256 ++hist_data->n_fields;
4258 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4263 hist_err(file->tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(field_str));
4267 static int create_val_field(struct hist_trigger_data *hist_data,
4268 unsigned int val_idx,
4269 struct trace_event_file *file,
4272 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4275 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4278 static const char no_comm[] = "(no comm)";
4280 static u64 hist_field_execname(struct hist_field *hist_field,
4281 struct tracing_map_elt *elt,
4282 struct trace_buffer *buffer,
4283 struct ring_buffer_event *rbe,
4286 struct hist_elt_data *elt_data;
4288 if (WARN_ON_ONCE(!elt))
4289 return (u64)(unsigned long)no_comm;
4291 elt_data = elt->private_data;
4293 if (WARN_ON_ONCE(!elt_data->comm))
4294 return (u64)(unsigned long)no_comm;
4296 return (u64)(unsigned long)(elt_data->comm);
4299 static u64 hist_field_stack(struct hist_field *hist_field,
4300 struct tracing_map_elt *elt,
4301 struct trace_buffer *buffer,
4302 struct ring_buffer_event *rbe,
4305 u32 str_item = *(u32 *)(event + hist_field->field->offset);
4306 int str_loc = str_item & 0xffff;
4307 char *addr = (char *)(event + str_loc);
4309 return (u64)(unsigned long)addr;
4312 static u64 hist_fn_call(struct hist_field *hist_field,
4313 struct tracing_map_elt *elt,
4314 struct trace_buffer *buffer,
4315 struct ring_buffer_event *rbe,
4318 switch (hist_field->fn_num) {
4319 case HIST_FIELD_FN_VAR_REF:
4320 return hist_field_var_ref(hist_field, elt, buffer, rbe, event);
4321 case HIST_FIELD_FN_COUNTER:
4322 return hist_field_counter(hist_field, elt, buffer, rbe, event);
4323 case HIST_FIELD_FN_CONST:
4324 return hist_field_const(hist_field, elt, buffer, rbe, event);
4325 case HIST_FIELD_FN_LOG2:
4326 return hist_field_log2(hist_field, elt, buffer, rbe, event);
4327 case HIST_FIELD_FN_BUCKET:
4328 return hist_field_bucket(hist_field, elt, buffer, rbe, event);
4329 case HIST_FIELD_FN_TIMESTAMP:
4330 return hist_field_timestamp(hist_field, elt, buffer, rbe, event);
4331 case HIST_FIELD_FN_CPU:
4332 return hist_field_cpu(hist_field, elt, buffer, rbe, event);
4333 case HIST_FIELD_FN_STRING:
4334 return hist_field_string(hist_field, elt, buffer, rbe, event);
4335 case HIST_FIELD_FN_DYNSTRING:
4336 return hist_field_dynstring(hist_field, elt, buffer, rbe, event);
4337 case HIST_FIELD_FN_RELDYNSTRING:
4338 return hist_field_reldynstring(hist_field, elt, buffer, rbe, event);
4339 case HIST_FIELD_FN_PSTRING:
4340 return hist_field_pstring(hist_field, elt, buffer, rbe, event);
4341 case HIST_FIELD_FN_S64:
4342 return hist_field_s64(hist_field, elt, buffer, rbe, event);
4343 case HIST_FIELD_FN_U64:
4344 return hist_field_u64(hist_field, elt, buffer, rbe, event);
4345 case HIST_FIELD_FN_S32:
4346 return hist_field_s32(hist_field, elt, buffer, rbe, event);
4347 case HIST_FIELD_FN_U32:
4348 return hist_field_u32(hist_field, elt, buffer, rbe, event);
4349 case HIST_FIELD_FN_S16:
4350 return hist_field_s16(hist_field, elt, buffer, rbe, event);
4351 case HIST_FIELD_FN_U16:
4352 return hist_field_u16(hist_field, elt, buffer, rbe, event);
4353 case HIST_FIELD_FN_S8:
4354 return hist_field_s8(hist_field, elt, buffer, rbe, event);
4355 case HIST_FIELD_FN_U8:
4356 return hist_field_u8(hist_field, elt, buffer, rbe, event);
4357 case HIST_FIELD_FN_UMINUS:
4358 return hist_field_unary_minus(hist_field, elt, buffer, rbe, event);
4359 case HIST_FIELD_FN_MINUS:
4360 return hist_field_minus(hist_field, elt, buffer, rbe, event);
4361 case HIST_FIELD_FN_PLUS:
4362 return hist_field_plus(hist_field, elt, buffer, rbe, event);
4363 case HIST_FIELD_FN_DIV:
4364 return hist_field_div(hist_field, elt, buffer, rbe, event);
4365 case HIST_FIELD_FN_MULT:
4366 return hist_field_mult(hist_field, elt, buffer, rbe, event);
4367 case HIST_FIELD_FN_DIV_POWER2:
4368 return div_by_power_of_two(hist_field, elt, buffer, rbe, event);
4369 case HIST_FIELD_FN_DIV_NOT_POWER2:
4370 return div_by_not_power_of_two(hist_field, elt, buffer, rbe, event);
4371 case HIST_FIELD_FN_DIV_MULT_SHIFT:
4372 return div_by_mult_and_shift(hist_field, elt, buffer, rbe, event);
4373 case HIST_FIELD_FN_EXECNAME:
4374 return hist_field_execname(hist_field, elt, buffer, rbe, event);
4375 case HIST_FIELD_FN_STACK:
4376 return hist_field_stack(hist_field, elt, buffer, rbe, event);
4382 /* Convert a var that points to common_pid.execname to a string */
4383 static void update_var_execname(struct hist_field *hist_field)
4385 hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR |
4386 HIST_FIELD_FL_EXECNAME;
4387 hist_field->size = MAX_FILTER_STR_VAL;
4388 hist_field->is_signed = 0;
4390 kfree_const(hist_field->type);
4391 hist_field->type = "char[]";
4393 hist_field->fn_num = HIST_FIELD_FN_EXECNAME;
4396 static int create_var_field(struct hist_trigger_data *hist_data,
4397 unsigned int val_idx,
4398 struct trace_event_file *file,
4399 char *var_name, char *expr_str)
4401 struct trace_array *tr = hist_data->event_file->tr;
4402 unsigned long flags = 0;
4405 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4408 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
4409 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
4413 flags |= HIST_FIELD_FL_VAR;
4414 hist_data->n_vars++;
4415 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4418 ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4420 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME)
4421 update_var_execname(hist_data->fields[val_idx]);
4423 if (!ret && hist_data->fields[val_idx]->flags &
4424 (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE))
4425 hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
4430 static int create_val_fields(struct hist_trigger_data *hist_data,
4431 struct trace_event_file *file)
4433 unsigned int i, j = 1, n_hitcount = 0;
4434 char *fields_str, *field_str;
4437 ret = create_hitcount_val(hist_data);
4441 fields_str = hist_data->attrs->vals_str;
4445 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4446 j < TRACING_MAP_VALS_MAX; i++) {
4447 field_str = strsep(&fields_str, ",");
4451 if (strcmp(field_str, "hitcount") == 0) {
4456 ret = create_val_field(hist_data, j++, file, field_str);
4461 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4464 /* There is only raw hitcount but nohitcount suppresses it. */
4465 if (j == 1 && hist_data->attrs->no_hitcount) {
4466 hist_err(hist_data->event_file->tr, HIST_ERR_NEED_NOHC_VAL, 0);
4473 static int create_key_field(struct hist_trigger_data *hist_data,
4474 unsigned int key_idx,
4475 unsigned int key_offset,
4476 struct trace_event_file *file,
4479 struct trace_array *tr = hist_data->event_file->tr;
4480 struct hist_field *hist_field = NULL;
4481 unsigned long flags = 0;
4482 unsigned int key_size;
4483 int ret = 0, n_subexprs = 0;
4485 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
4488 flags |= HIST_FIELD_FL_KEY;
4490 if (strcmp(field_str, "stacktrace") == 0) {
4491 flags |= HIST_FIELD_FL_STACKTRACE;
4492 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
4493 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
4495 hist_field = parse_expr(hist_data, file, field_str, flags,
4497 if (IS_ERR(hist_field)) {
4498 ret = PTR_ERR(hist_field);
4502 if (field_has_hist_vars(hist_field, 0)) {
4503 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
4504 destroy_hist_field(hist_field, 0);
4509 key_size = hist_field->size;
4512 hist_data->fields[key_idx] = hist_field;
4514 key_size = ALIGN(key_size, sizeof(u64));
4515 hist_data->fields[key_idx]->size = key_size;
4516 hist_data->fields[key_idx]->offset = key_offset;
4518 hist_data->key_size += key_size;
4520 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4525 hist_data->n_keys++;
4526 hist_data->n_fields++;
4528 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4536 static int create_key_fields(struct hist_trigger_data *hist_data,
4537 struct trace_event_file *file)
4539 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
4540 char *fields_str, *field_str;
4543 fields_str = hist_data->attrs->keys_str;
4547 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
4548 field_str = strsep(&fields_str, ",");
4551 ret = create_key_field(hist_data, i, key_offset,
4566 static int create_var_fields(struct hist_trigger_data *hist_data,
4567 struct trace_event_file *file)
4569 unsigned int i, j = hist_data->n_vals;
4572 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4574 for (i = 0; i < n_vars; i++) {
4575 char *var_name = hist_data->attrs->var_defs.name[i];
4576 char *expr = hist_data->attrs->var_defs.expr[i];
4578 ret = create_var_field(hist_data, j++, file, var_name, expr);
4586 static void free_var_defs(struct hist_trigger_data *hist_data)
4590 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4591 kfree(hist_data->attrs->var_defs.name[i]);
4592 kfree(hist_data->attrs->var_defs.expr[i]);
4595 hist_data->attrs->var_defs.n_vars = 0;
4598 static int parse_var_defs(struct hist_trigger_data *hist_data)
4600 struct trace_array *tr = hist_data->event_file->tr;
4601 char *s, *str, *var_name, *field_str;
4602 unsigned int i, j, n_vars = 0;
4605 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4606 str = hist_data->attrs->assignment_str[i];
4607 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4608 field_str = strsep(&str, ",");
4612 var_name = strsep(&field_str, "=");
4613 if (!var_name || !field_str) {
4614 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4620 if (n_vars == TRACING_MAP_VARS_MAX) {
4621 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
4626 s = kstrdup(var_name, GFP_KERNEL);
4631 hist_data->attrs->var_defs.name[n_vars] = s;
4633 s = kstrdup(field_str, GFP_KERNEL);
4635 kfree(hist_data->attrs->var_defs.name[n_vars]);
4636 hist_data->attrs->var_defs.name[n_vars] = NULL;
4640 hist_data->attrs->var_defs.expr[n_vars++] = s;
4642 hist_data->attrs->var_defs.n_vars = n_vars;
4648 free_var_defs(hist_data);
4653 static int create_hist_fields(struct hist_trigger_data *hist_data,
4654 struct trace_event_file *file)
4658 ret = parse_var_defs(hist_data);
4662 ret = create_val_fields(hist_data, file);
4666 ret = create_var_fields(hist_data, file);
4670 ret = create_key_fields(hist_data, file);
4673 free_var_defs(hist_data);
4678 static int is_descending(struct trace_array *tr, const char *str)
4683 if (strcmp(str, "descending") == 0)
4686 if (strcmp(str, "ascending") == 0)
4689 hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str));
4694 static int create_sort_keys(struct hist_trigger_data *hist_data)
4696 struct trace_array *tr = hist_data->event_file->tr;
4697 char *fields_str = hist_data->attrs->sort_key_str;
4698 struct tracing_map_sort_key *sort_key;
4699 int descending, ret = 0;
4700 unsigned int i, j, k;
4702 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4707 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
4708 struct hist_field *hist_field;
4709 char *field_str, *field_name;
4710 const char *test_name;
4712 sort_key = &hist_data->sort_keys[i];
4714 field_str = strsep(&fields_str, ",");
4720 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4724 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4725 hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort="));
4730 field_name = strsep(&field_str, ".");
4731 if (!field_name || !*field_name) {
4733 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4737 if (strcmp(field_name, "hitcount") == 0) {
4738 descending = is_descending(tr, field_str);
4739 if (descending < 0) {
4743 sort_key->descending = descending;
4747 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4750 hist_field = hist_data->fields[j];
4751 if (hist_field->flags & HIST_FIELD_FL_VAR)
4756 test_name = hist_field_name(hist_field, 0);
4758 if (strcmp(field_name, test_name) == 0) {
4759 sort_key->field_idx = idx;
4760 descending = is_descending(tr, field_str);
4761 if (descending < 0) {
4765 sort_key->descending = descending;
4769 if (j == hist_data->n_fields) {
4771 hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name));
4776 hist_data->n_sort_keys = i;
4781 static void destroy_actions(struct hist_trigger_data *hist_data)
4785 for (i = 0; i < hist_data->n_actions; i++) {
4786 struct action_data *data = hist_data->actions[i];
4788 if (data->handler == HANDLER_ONMATCH)
4789 onmatch_destroy(data);
4790 else if (data->handler == HANDLER_ONMAX ||
4791 data->handler == HANDLER_ONCHANGE)
4792 track_data_destroy(hist_data, data);
4798 static int parse_actions(struct hist_trigger_data *hist_data)
4800 struct trace_array *tr = hist_data->event_file->tr;
4801 struct action_data *data;
4807 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4808 str = hist_data->attrs->action_str[i];
4810 if ((len = str_has_prefix(str, "onmatch("))) {
4811 char *action_str = str + len;
4813 data = onmatch_parse(tr, action_str);
4815 ret = PTR_ERR(data);
4818 } else if ((len = str_has_prefix(str, "onmax("))) {
4819 char *action_str = str + len;
4821 data = track_data_parse(hist_data, action_str,
4824 ret = PTR_ERR(data);
4827 } else if ((len = str_has_prefix(str, "onchange("))) {
4828 char *action_str = str + len;
4830 data = track_data_parse(hist_data, action_str,
4833 ret = PTR_ERR(data);
4841 hist_data->actions[hist_data->n_actions++] = data;
4847 static int create_actions(struct hist_trigger_data *hist_data)
4849 struct action_data *data;
4853 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4854 data = hist_data->actions[i];
4856 if (data->handler == HANDLER_ONMATCH) {
4857 ret = onmatch_create(hist_data, data);
4860 } else if (data->handler == HANDLER_ONMAX ||
4861 data->handler == HANDLER_ONCHANGE) {
4862 ret = track_data_create(hist_data, data);
4874 static void print_actions(struct seq_file *m,
4875 struct hist_trigger_data *hist_data,
4876 struct tracing_map_elt *elt)
4880 for (i = 0; i < hist_data->n_actions; i++) {
4881 struct action_data *data = hist_data->actions[i];
4883 if (data->action == ACTION_SNAPSHOT)
4886 if (data->handler == HANDLER_ONMAX ||
4887 data->handler == HANDLER_ONCHANGE)
4888 track_data_print(m, hist_data, elt, data);
4892 static void print_action_spec(struct seq_file *m,
4893 struct hist_trigger_data *hist_data,
4894 struct action_data *data)
4898 if (data->action == ACTION_SAVE) {
4899 for (i = 0; i < hist_data->n_save_vars; i++) {
4900 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4901 if (i < hist_data->n_save_vars - 1)
4904 } else if (data->action == ACTION_TRACE) {
4905 if (data->use_trace_keyword)
4906 seq_printf(m, "%s", data->synth_event_name);
4907 for (i = 0; i < data->n_params; i++) {
4908 if (i || data->use_trace_keyword)
4910 seq_printf(m, "%s", data->params[i]);
4915 static void print_track_data_spec(struct seq_file *m,
4916 struct hist_trigger_data *hist_data,
4917 struct action_data *data)
4919 if (data->handler == HANDLER_ONMAX)
4920 seq_puts(m, ":onmax(");
4921 else if (data->handler == HANDLER_ONCHANGE)
4922 seq_puts(m, ":onchange(");
4923 seq_printf(m, "%s", data->track_data.var_str);
4924 seq_printf(m, ").%s(", data->action_name);
4926 print_action_spec(m, hist_data, data);
4931 static void print_onmatch_spec(struct seq_file *m,
4932 struct hist_trigger_data *hist_data,
4933 struct action_data *data)
4935 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4936 data->match_data.event);
4938 seq_printf(m, "%s(", data->action_name);
4940 print_action_spec(m, hist_data, data);
4945 static bool actions_match(struct hist_trigger_data *hist_data,
4946 struct hist_trigger_data *hist_data_test)
4950 if (hist_data->n_actions != hist_data_test->n_actions)
4953 for (i = 0; i < hist_data->n_actions; i++) {
4954 struct action_data *data = hist_data->actions[i];
4955 struct action_data *data_test = hist_data_test->actions[i];
4956 char *action_name, *action_name_test;
4958 if (data->handler != data_test->handler)
4960 if (data->action != data_test->action)
4963 if (data->n_params != data_test->n_params)
4966 for (j = 0; j < data->n_params; j++) {
4967 if (strcmp(data->params[j], data_test->params[j]) != 0)
4971 if (data->use_trace_keyword)
4972 action_name = data->synth_event_name;
4974 action_name = data->action_name;
4976 if (data_test->use_trace_keyword)
4977 action_name_test = data_test->synth_event_name;
4979 action_name_test = data_test->action_name;
4981 if (strcmp(action_name, action_name_test) != 0)
4984 if (data->handler == HANDLER_ONMATCH) {
4985 if (strcmp(data->match_data.event_system,
4986 data_test->match_data.event_system) != 0)
4988 if (strcmp(data->match_data.event,
4989 data_test->match_data.event) != 0)
4991 } else if (data->handler == HANDLER_ONMAX ||
4992 data->handler == HANDLER_ONCHANGE) {
4993 if (strcmp(data->track_data.var_str,
4994 data_test->track_data.var_str) != 0)
5003 static void print_actions_spec(struct seq_file *m,
5004 struct hist_trigger_data *hist_data)
5008 for (i = 0; i < hist_data->n_actions; i++) {
5009 struct action_data *data = hist_data->actions[i];
5011 if (data->handler == HANDLER_ONMATCH)
5012 print_onmatch_spec(m, hist_data, data);
5013 else if (data->handler == HANDLER_ONMAX ||
5014 data->handler == HANDLER_ONCHANGE)
5015 print_track_data_spec(m, hist_data, data);
5019 static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
5023 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5024 kfree(hist_data->field_var_hists[i]->cmd);
5025 kfree(hist_data->field_var_hists[i]);
5029 static void destroy_hist_data(struct hist_trigger_data *hist_data)
5034 destroy_hist_trigger_attrs(hist_data->attrs);
5035 destroy_hist_fields(hist_data);
5036 tracing_map_destroy(hist_data->map);
5038 destroy_actions(hist_data);
5039 destroy_field_vars(hist_data);
5040 destroy_field_var_hists(hist_data);
5045 static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
5047 struct tracing_map *map = hist_data->map;
5048 struct ftrace_event_field *field;
5049 struct hist_field *hist_field;
5052 for_each_hist_field(i, hist_data) {
5053 hist_field = hist_data->fields[i];
5054 if (hist_field->flags & HIST_FIELD_FL_KEY) {
5055 tracing_map_cmp_fn_t cmp_fn;
5057 field = hist_field->field;
5059 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
5060 cmp_fn = tracing_map_cmp_none;
5061 else if (!field || hist_field->flags & HIST_FIELD_FL_CPU)
5062 cmp_fn = tracing_map_cmp_num(hist_field->size,
5063 hist_field->is_signed);
5064 else if (is_string_field(field))
5065 cmp_fn = tracing_map_cmp_string;
5067 cmp_fn = tracing_map_cmp_num(field->size,
5069 idx = tracing_map_add_key_field(map,
5072 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
5073 idx = tracing_map_add_sum_field(map);
5078 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5079 idx = tracing_map_add_var(map);
5082 hist_field->var.idx = idx;
5083 hist_field->var.hist_data = hist_data;
5090 static struct hist_trigger_data *
5091 create_hist_data(unsigned int map_bits,
5092 struct hist_trigger_attrs *attrs,
5093 struct trace_event_file *file,
5096 const struct tracing_map_ops *map_ops = NULL;
5097 struct hist_trigger_data *hist_data;
5100 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5102 return ERR_PTR(-ENOMEM);
5104 hist_data->attrs = attrs;
5105 hist_data->remove = remove;
5106 hist_data->event_file = file;
5108 ret = parse_actions(hist_data);
5112 ret = create_hist_fields(hist_data, file);
5116 ret = create_sort_keys(hist_data);
5120 map_ops = &hist_trigger_elt_data_ops;
5122 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
5123 map_ops, hist_data);
5124 if (IS_ERR(hist_data->map)) {
5125 ret = PTR_ERR(hist_data->map);
5126 hist_data->map = NULL;
5130 ret = create_tracing_map_fields(hist_data);
5136 hist_data->attrs = NULL;
5138 destroy_hist_data(hist_data);
5140 hist_data = ERR_PTR(ret);
5145 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
5146 struct tracing_map_elt *elt,
5147 struct trace_buffer *buffer, void *rec,
5148 struct ring_buffer_event *rbe,
5151 struct hist_elt_data *elt_data;
5152 struct hist_field *hist_field;
5153 unsigned int i, var_idx;
5156 elt_data = elt->private_data;
5157 elt_data->var_ref_vals = var_ref_vals;
5159 for_each_hist_val_field(i, hist_data) {
5160 hist_field = hist_data->fields[i];
5161 hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
5162 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5163 var_idx = hist_field->var.idx;
5165 if (hist_field->flags &
5166 (HIST_FIELD_FL_STRING | HIST_FIELD_FL_STACKTRACE)) {
5167 unsigned int str_start, var_str_idx, idx;
5168 char *str, *val_str;
5171 str_start = hist_data->n_field_var_str +
5172 hist_data->n_save_var_str;
5173 var_str_idx = hist_field->var_str_idx;
5174 idx = str_start + var_str_idx;
5176 str = elt_data->field_var_str[idx];
5177 val_str = (char *)(uintptr_t)hist_val;
5179 if (hist_field->flags & HIST_FIELD_FL_STRING) {
5180 size = min(hist_field->size, STR_VAR_LEN_MAX);
5181 strscpy(str, val_str, size);
5183 char *stack_start = str + sizeof(unsigned long);
5186 e = stack_trace_save((void *)stack_start,
5187 HIST_STACKTRACE_DEPTH,
5188 HIST_STACKTRACE_SKIP);
5189 if (e < HIST_STACKTRACE_DEPTH - 1)
5190 ((unsigned long *)stack_start)[e] = 0;
5191 *((unsigned long *)str) = e;
5193 hist_val = (u64)(uintptr_t)str;
5195 tracing_map_set_var(elt, var_idx, hist_val);
5198 tracing_map_update_sum(elt, i, hist_val);
5201 for_each_hist_key_field(i, hist_data) {
5202 hist_field = hist_data->fields[i];
5203 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5204 hist_val = hist_fn_call(hist_field, elt, buffer, rbe, rec);
5205 var_idx = hist_field->var.idx;
5206 tracing_map_set_var(elt, var_idx, hist_val);
5210 update_field_vars(hist_data, elt, buffer, rbe, rec);
5213 static inline void add_to_key(char *compound_key, void *key,
5214 struct hist_field *key_field, void *rec)
5216 size_t size = key_field->size;
5218 if (key_field->flags & HIST_FIELD_FL_STRING) {
5219 struct ftrace_event_field *field;
5221 field = key_field->field;
5222 if (field->filter_type == FILTER_DYN_STRING ||
5223 field->filter_type == FILTER_RDYN_STRING)
5224 size = *(u32 *)(rec + field->offset) >> 16;
5225 else if (field->filter_type == FILTER_STATIC_STRING)
5228 /* ensure NULL-termination */
5229 if (size > key_field->size - 1)
5230 size = key_field->size - 1;
5232 strncpy(compound_key + key_field->offset, (char *)key, size);
5234 memcpy(compound_key + key_field->offset, key, size);
5238 hist_trigger_actions(struct hist_trigger_data *hist_data,
5239 struct tracing_map_elt *elt,
5240 struct trace_buffer *buffer, void *rec,
5241 struct ring_buffer_event *rbe, void *key,
5244 struct action_data *data;
5247 for (i = 0; i < hist_data->n_actions; i++) {
5248 data = hist_data->actions[i];
5249 data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals);
5253 static void event_hist_trigger(struct event_trigger_data *data,
5254 struct trace_buffer *buffer, void *rec,
5255 struct ring_buffer_event *rbe)
5257 struct hist_trigger_data *hist_data = data->private_data;
5258 bool use_compound_key = (hist_data->n_keys > 1);
5259 unsigned long entries[HIST_STACKTRACE_DEPTH];
5260 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
5261 char compound_key[HIST_KEY_SIZE_MAX];
5262 struct tracing_map_elt *elt = NULL;
5263 struct hist_field *key_field;
5271 memset(compound_key, 0, hist_data->key_size);
5273 for_each_hist_key_field(i, hist_data) {
5274 key_field = hist_data->fields[i];
5276 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5277 memset(entries, 0, HIST_STACKTRACE_SIZE);
5278 if (key_field->field) {
5279 unsigned long *stack, n_entries;
5281 field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec);
5282 stack = (unsigned long *)(long)field_contents;
5284 memcpy(entries, ++stack, n_entries * sizeof(unsigned long));
5286 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
5287 HIST_STACKTRACE_SKIP);
5291 field_contents = hist_fn_call(key_field, elt, buffer, rbe, rec);
5292 if (key_field->flags & HIST_FIELD_FL_STRING) {
5293 key = (void *)(unsigned long)field_contents;
5294 use_compound_key = true;
5296 key = (void *)&field_contents;
5299 if (use_compound_key)
5300 add_to_key(compound_key, key, key_field, rec);
5303 if (use_compound_key)
5306 if (hist_data->n_var_refs &&
5307 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5310 elt = tracing_map_insert(hist_data->map, key);
5314 hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals);
5316 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
5317 hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals);
5320 static void hist_trigger_stacktrace_print(struct seq_file *m,
5321 unsigned long *stacktrace_entries,
5322 unsigned int max_entries)
5324 unsigned int spaces = 8;
5327 for (i = 0; i < max_entries; i++) {
5328 if (!stacktrace_entries[i])
5331 seq_printf(m, "%*c", 1 + spaces, ' ');
5332 seq_printf(m, "%pS\n", (void*)stacktrace_entries[i]);
5336 static void hist_trigger_print_key(struct seq_file *m,
5337 struct hist_trigger_data *hist_data,
5339 struct tracing_map_elt *elt)
5341 struct hist_field *key_field;
5342 bool multiline = false;
5343 const char *field_name;
5349 for_each_hist_key_field(i, hist_data) {
5350 key_field = hist_data->fields[i];
5352 if (i > hist_data->n_vals)
5355 field_name = hist_field_name(key_field, 0);
5357 if (key_field->flags & HIST_FIELD_FL_HEX) {
5358 uval = *(u64 *)(key + key_field->offset);
5359 seq_printf(m, "%s: %llx", field_name, uval);
5360 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5361 uval = *(u64 *)(key + key_field->offset);
5362 seq_printf(m, "%s: [%llx] %-45ps", field_name,
5363 uval, (void *)(uintptr_t)uval);
5364 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5365 uval = *(u64 *)(key + key_field->offset);
5366 seq_printf(m, "%s: [%llx] %-55pS", field_name,
5367 uval, (void *)(uintptr_t)uval);
5368 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
5369 struct hist_elt_data *elt_data = elt->private_data;
5372 if (WARN_ON_ONCE(!elt_data))
5375 comm = elt_data->comm;
5377 uval = *(u64 *)(key + key_field->offset);
5378 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5380 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5381 const char *syscall_name;
5383 uval = *(u64 *)(key + key_field->offset);
5384 syscall_name = get_syscall_name(uval);
5386 syscall_name = "unknown_syscall";
5388 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5389 syscall_name, uval);
5390 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5391 if (key_field->field)
5392 seq_printf(m, "%s.stacktrace", key_field->field->name);
5394 seq_puts(m, "common_stacktrace:\n");
5395 hist_trigger_stacktrace_print(m,
5396 key + key_field->offset,
5397 HIST_STACKTRACE_DEPTH);
5399 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
5400 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
5401 *(u64 *)(key + key_field->offset));
5402 } else if (key_field->flags & HIST_FIELD_FL_BUCKET) {
5403 unsigned long buckets = key_field->buckets;
5404 uval = *(u64 *)(key + key_field->offset);
5405 seq_printf(m, "%s: ~ %llu-%llu", field_name,
5406 uval, uval + buckets -1);
5407 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
5408 seq_printf(m, "%s: %-50s", field_name,
5409 (char *)(key + key_field->offset));
5411 uval = *(u64 *)(key + key_field->offset);
5412 seq_printf(m, "%s: %10llu", field_name, uval);
5422 /* Get the 100 times of the percentage of @val in @total */
5423 static inline unsigned int __get_percentage(u64 val, u64 total)
5428 if (val < (U64_MAX / 10000))
5429 return (unsigned int)div64_ul(val * 10000, total);
5431 total = div64_u64(total, 10000);
5435 return (unsigned int)div64_ul(val, total);
5437 return val ? UINT_MAX : 0;
5440 #define BAR_CHAR '#'
5442 static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max)
5444 unsigned int len = __get_percentage(val, max);
5447 if (len == UINT_MAX) {
5448 snprintf(buf, size, "[ERROR]");
5452 len = len * size / 10000;
5453 for (i = 0; i < len && i < size; i++)
5462 struct hist_val_stat {
5467 static void hist_trigger_print_val(struct seq_file *m, unsigned int idx,
5468 const char *field_name, unsigned long flags,
5469 struct hist_val_stat *stats,
5470 struct tracing_map_elt *elt)
5472 u64 val = tracing_map_read_sum(elt, idx);
5476 if (flags & HIST_FIELD_FL_PERCENT) {
5477 pc = __get_percentage(val, stats[idx].total);
5479 seq_printf(m, " %s (%%):[ERROR]", field_name);
5481 seq_printf(m, " %s (%%): %3u.%02u", field_name,
5482 pc / 100, pc % 100);
5483 } else if (flags & HIST_FIELD_FL_GRAPH) {
5484 seq_printf(m, " %s: %20s", field_name,
5485 __fill_bar_str(bar, 20, val, stats[idx].max));
5486 } else if (flags & HIST_FIELD_FL_HEX) {
5487 seq_printf(m, " %s: %10llx", field_name, val);
5489 seq_printf(m, " %s: %10llu", field_name, val);
5493 static void hist_trigger_entry_print(struct seq_file *m,
5494 struct hist_trigger_data *hist_data,
5495 struct hist_val_stat *stats,
5497 struct tracing_map_elt *elt)
5499 const char *field_name;
5500 unsigned int i = HITCOUNT_IDX;
5501 unsigned long flags;
5503 hist_trigger_print_key(m, hist_data, key, elt);
5505 /* At first, show the raw hitcount if !nohitcount */
5506 if (!hist_data->attrs->no_hitcount)
5507 hist_trigger_print_val(m, i, "hitcount", 0, stats, elt);
5509 for (i = 1; i < hist_data->n_vals; i++) {
5510 field_name = hist_field_name(hist_data->fields[i], 0);
5511 flags = hist_data->fields[i]->flags;
5512 if (flags & HIST_FIELD_FL_VAR || flags & HIST_FIELD_FL_EXPR)
5516 hist_trigger_print_val(m, i, field_name, flags, stats, elt);
5519 print_actions(m, hist_data, elt);
5524 static int print_entries(struct seq_file *m,
5525 struct hist_trigger_data *hist_data)
5527 struct tracing_map_sort_entry **sort_entries = NULL;
5528 struct tracing_map *map = hist_data->map;
5529 int i, j, n_entries;
5530 struct hist_val_stat *stats = NULL;
5533 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5534 hist_data->n_sort_keys,
5539 /* Calculate the max and the total for each field if needed. */
5540 for (j = 0; j < hist_data->n_vals; j++) {
5541 if (!(hist_data->fields[j]->flags &
5542 (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH)))
5545 stats = kcalloc(hist_data->n_vals, sizeof(*stats),
5548 n_entries = -ENOMEM;
5552 for (i = 0; i < n_entries; i++) {
5553 val = tracing_map_read_sum(sort_entries[i]->elt, j);
5554 stats[j].total += val;
5555 if (stats[j].max < val)
5560 for (i = 0; i < n_entries; i++)
5561 hist_trigger_entry_print(m, hist_data, stats,
5562 sort_entries[i]->key,
5563 sort_entries[i]->elt);
5567 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5572 static void hist_trigger_show(struct seq_file *m,
5573 struct event_trigger_data *data, int n)
5575 struct hist_trigger_data *hist_data;
5579 seq_puts(m, "\n\n");
5581 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5582 data->ops->print(m, data);
5583 seq_puts(m, "#\n\n");
5585 hist_data = data->private_data;
5586 n_entries = print_entries(m, hist_data);
5590 track_data_snapshot_print(m, hist_data);
5592 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5593 (u64)atomic64_read(&hist_data->map->hits),
5594 n_entries, (u64)atomic64_read(&hist_data->map->drops));
5597 static int hist_show(struct seq_file *m, void *v)
5599 struct event_trigger_data *data;
5600 struct trace_event_file *event_file;
5603 mutex_lock(&event_mutex);
5605 event_file = event_file_data(m->private);
5606 if (unlikely(!event_file)) {
5611 list_for_each_entry(data, &event_file->triggers, list) {
5612 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5613 hist_trigger_show(m, data, n++);
5617 mutex_unlock(&event_mutex);
5622 static int event_hist_open(struct inode *inode, struct file *file)
5626 ret = tracing_open_file_tr(inode, file);
5630 /* Clear private_data to avoid warning in single_open() */
5631 file->private_data = NULL;
5632 return single_open(file, hist_show, file);
5635 const struct file_operations event_hist_fops = {
5636 .open = event_hist_open,
5638 .llseek = seq_lseek,
5639 .release = tracing_single_release_file_tr,
5642 #ifdef CONFIG_HIST_TRIGGERS_DEBUG
5643 static void hist_field_debug_show_flags(struct seq_file *m,
5644 unsigned long flags)
5646 seq_puts(m, " flags:\n");
5648 if (flags & HIST_FIELD_FL_KEY)
5649 seq_puts(m, " HIST_FIELD_FL_KEY\n");
5650 else if (flags & HIST_FIELD_FL_HITCOUNT)
5651 seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n");
5652 else if (flags & HIST_FIELD_FL_VAR)
5653 seq_puts(m, " HIST_FIELD_FL_VAR\n");
5654 else if (flags & HIST_FIELD_FL_VAR_REF)
5655 seq_puts(m, " HIST_FIELD_FL_VAR_REF\n");
5657 seq_puts(m, " VAL: normal u64 value\n");
5659 if (flags & HIST_FIELD_FL_ALIAS)
5660 seq_puts(m, " HIST_FIELD_FL_ALIAS\n");
5661 else if (flags & HIST_FIELD_FL_CONST)
5662 seq_puts(m, " HIST_FIELD_FL_CONST\n");
5665 static int hist_field_debug_show(struct seq_file *m,
5666 struct hist_field *field, unsigned long flags)
5668 if ((field->flags & flags) != flags) {
5669 seq_printf(m, "ERROR: bad flags - %lx\n", flags);
5673 hist_field_debug_show_flags(m, field->flags);
5675 seq_printf(m, " ftrace_event_field name: %s\n",
5676 field->field->name);
5678 if (field->flags & HIST_FIELD_FL_VAR) {
5679 seq_printf(m, " var.name: %s\n", field->var.name);
5680 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5684 if (field->flags & HIST_FIELD_FL_CONST)
5685 seq_printf(m, " constant: %llu\n", field->constant);
5687 if (field->flags & HIST_FIELD_FL_ALIAS)
5688 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
5689 field->var_ref_idx);
5691 if (field->flags & HIST_FIELD_FL_VAR_REF) {
5692 seq_printf(m, " name: %s\n", field->name);
5693 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5695 seq_printf(m, " var.hist_data: %p\n", field->var.hist_data);
5696 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
5697 field->var_ref_idx);
5699 seq_printf(m, " system: %s\n", field->system);
5700 if (field->event_name)
5701 seq_printf(m, " event_name: %s\n", field->event_name);
5704 seq_printf(m, " type: %s\n", field->type);
5705 seq_printf(m, " size: %u\n", field->size);
5706 seq_printf(m, " is_signed: %u\n", field->is_signed);
5711 static int field_var_debug_show(struct seq_file *m,
5712 struct field_var *field_var, unsigned int i,
5715 const char *vars_name = save_vars ? "save_vars" : "field_vars";
5716 struct hist_field *field;
5719 seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i);
5721 field = field_var->var;
5723 seq_printf(m, "\n %s[%d].var:\n", vars_name, i);
5725 hist_field_debug_show_flags(m, field->flags);
5726 seq_printf(m, " var.name: %s\n", field->var.name);
5727 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5730 field = field_var->val;
5732 seq_printf(m, "\n %s[%d].val:\n", vars_name, i);
5734 seq_printf(m, " ftrace_event_field name: %s\n",
5735 field->field->name);
5741 seq_printf(m, " type: %s\n", field->type);
5742 seq_printf(m, " size: %u\n", field->size);
5743 seq_printf(m, " is_signed: %u\n", field->is_signed);
5748 static int hist_action_debug_show(struct seq_file *m,
5749 struct action_data *data, int i)
5753 if (data->handler == HANDLER_ONMAX ||
5754 data->handler == HANDLER_ONCHANGE) {
5755 seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i);
5756 ret = hist_field_debug_show(m, data->track_data.var_ref,
5757 HIST_FIELD_FL_VAR_REF);
5761 seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i);
5762 ret = hist_field_debug_show(m, data->track_data.track_var,
5768 if (data->handler == HANDLER_ONMATCH) {
5769 seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n",
5770 i, data->match_data.event_system);
5771 seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n",
5772 i, data->match_data.event);
5778 static int hist_actions_debug_show(struct seq_file *m,
5779 struct hist_trigger_data *hist_data)
5783 if (hist_data->n_actions)
5784 seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n");
5786 for (i = 0; i < hist_data->n_actions; i++) {
5787 struct action_data *action = hist_data->actions[i];
5789 ret = hist_action_debug_show(m, action, i);
5794 if (hist_data->n_save_vars)
5795 seq_puts(m, "\n save action variables (save() params):\n");
5797 for (i = 0; i < hist_data->n_save_vars; i++) {
5798 ret = field_var_debug_show(m, hist_data->save_vars[i], i, true);
5806 static void hist_trigger_debug_show(struct seq_file *m,
5807 struct event_trigger_data *data, int n)
5809 struct hist_trigger_data *hist_data;
5813 seq_puts(m, "\n\n");
5815 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5816 data->ops->print(m, data);
5817 seq_puts(m, "#\n\n");
5819 hist_data = data->private_data;
5821 seq_printf(m, "hist_data: %p\n\n", hist_data);
5822 seq_printf(m, " n_vals: %u\n", hist_data->n_vals);
5823 seq_printf(m, " n_keys: %u\n", hist_data->n_keys);
5824 seq_printf(m, " n_fields: %u\n", hist_data->n_fields);
5826 seq_puts(m, "\n val fields:\n\n");
5828 seq_puts(m, " hist_data->fields[0]:\n");
5829 ret = hist_field_debug_show(m, hist_data->fields[0],
5830 HIST_FIELD_FL_HITCOUNT);
5834 for (i = 1; i < hist_data->n_vals; i++) {
5835 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5836 ret = hist_field_debug_show(m, hist_data->fields[i], 0);
5841 seq_puts(m, "\n key fields:\n");
5843 for (i = hist_data->n_vals; i < hist_data->n_fields; i++) {
5844 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5845 ret = hist_field_debug_show(m, hist_data->fields[i],
5851 if (hist_data->n_var_refs)
5852 seq_puts(m, "\n variable reference fields:\n");
5854 for (i = 0; i < hist_data->n_var_refs; i++) {
5855 seq_printf(m, "\n hist_data->var_refs[%d]:\n", i);
5856 ret = hist_field_debug_show(m, hist_data->var_refs[i],
5857 HIST_FIELD_FL_VAR_REF);
5862 if (hist_data->n_field_vars)
5863 seq_puts(m, "\n field variables:\n");
5865 for (i = 0; i < hist_data->n_field_vars; i++) {
5866 ret = field_var_debug_show(m, hist_data->field_vars[i], i, false);
5871 ret = hist_actions_debug_show(m, hist_data);
5876 static int hist_debug_show(struct seq_file *m, void *v)
5878 struct event_trigger_data *data;
5879 struct trace_event_file *event_file;
5882 mutex_lock(&event_mutex);
5884 event_file = event_file_data(m->private);
5885 if (unlikely(!event_file)) {
5890 list_for_each_entry(data, &event_file->triggers, list) {
5891 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5892 hist_trigger_debug_show(m, data, n++);
5896 mutex_unlock(&event_mutex);
5901 static int event_hist_debug_open(struct inode *inode, struct file *file)
5905 ret = tracing_open_file_tr(inode, file);
5909 /* Clear private_data to avoid warning in single_open() */
5910 file->private_data = NULL;
5911 return single_open(file, hist_debug_show, file);
5914 const struct file_operations event_hist_debug_fops = {
5915 .open = event_hist_debug_open,
5917 .llseek = seq_lseek,
5918 .release = tracing_single_release_file_tr,
5922 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5924 const char *field_name = hist_field_name(hist_field, 0);
5926 if (hist_field->var.name)
5927 seq_printf(m, "%s=", hist_field->var.name);
5929 if (hist_field->flags & HIST_FIELD_FL_CPU)
5930 seq_puts(m, "common_cpu");
5931 else if (hist_field->flags & HIST_FIELD_FL_CONST)
5932 seq_printf(m, "%llu", hist_field->constant);
5933 else if (field_name) {
5934 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5935 hist_field->flags & HIST_FIELD_FL_ALIAS)
5937 seq_printf(m, "%s", field_name);
5938 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5939 seq_puts(m, "common_timestamp");
5941 if (hist_field->flags) {
5942 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5943 !(hist_field->flags & HIST_FIELD_FL_EXPR) &&
5944 !(hist_field->flags & HIST_FIELD_FL_STACKTRACE)) {
5945 const char *flags = get_hist_field_flags(hist_field);
5948 seq_printf(m, ".%s", flags);
5951 if (hist_field->buckets)
5952 seq_printf(m, "=%ld", hist_field->buckets);
5955 static int event_hist_trigger_print(struct seq_file *m,
5956 struct event_trigger_data *data)
5958 struct hist_trigger_data *hist_data = data->private_data;
5959 struct hist_field *field;
5960 bool have_var = false;
5961 bool show_val = false;
5964 seq_puts(m, HIST_PREFIX);
5967 seq_printf(m, "%s:", data->name);
5969 seq_puts(m, "keys=");
5971 for_each_hist_key_field(i, hist_data) {
5972 field = hist_data->fields[i];
5974 if (i > hist_data->n_vals)
5977 if (field->flags & HIST_FIELD_FL_STACKTRACE) {
5979 seq_printf(m, "%s.stacktrace", field->field->name);
5981 seq_puts(m, "common_stacktrace");
5983 hist_field_print(m, field);
5986 seq_puts(m, ":vals=");
5988 for_each_hist_val_field(i, hist_data) {
5989 field = hist_data->fields[i];
5990 if (field->flags & HIST_FIELD_FL_VAR) {
5995 if (i == HITCOUNT_IDX) {
5996 if (hist_data->attrs->no_hitcount)
5998 seq_puts(m, "hitcount");
6002 hist_field_print(m, field);
6012 for_each_hist_val_field(i, hist_data) {
6013 field = hist_data->fields[i];
6015 if (field->flags & HIST_FIELD_FL_VAR) {
6018 hist_field_print(m, field);
6023 seq_puts(m, ":sort=");
6025 for (i = 0; i < hist_data->n_sort_keys; i++) {
6026 struct tracing_map_sort_key *sort_key;
6027 unsigned int idx, first_key_idx;
6030 first_key_idx = hist_data->n_vals - hist_data->n_vars;
6032 sort_key = &hist_data->sort_keys[i];
6033 idx = sort_key->field_idx;
6035 if (WARN_ON(idx >= HIST_FIELDS_MAX))
6041 if (idx == HITCOUNT_IDX)
6042 seq_puts(m, "hitcount");
6044 if (idx >= first_key_idx)
6045 idx += hist_data->n_vars;
6046 hist_field_print(m, hist_data->fields[idx]);
6049 if (sort_key->descending)
6050 seq_puts(m, ".descending");
6052 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
6053 if (hist_data->enable_timestamps)
6054 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
6055 if (hist_data->attrs->no_hitcount)
6056 seq_puts(m, ":nohitcount");
6058 print_actions_spec(m, hist_data);
6060 if (data->filter_str)
6061 seq_printf(m, " if %s", data->filter_str);
6064 seq_puts(m, " [paused]");
6066 seq_puts(m, " [active]");
6073 static int event_hist_trigger_init(struct event_trigger_data *data)
6075 struct hist_trigger_data *hist_data = data->private_data;
6077 if (!data->ref && hist_data->attrs->name)
6078 save_named_trigger(hist_data->attrs->name, data);
6085 static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
6087 struct trace_event_file *file;
6092 for (i = 0; i < hist_data->n_field_var_hists; i++) {
6093 file = hist_data->field_var_hists[i]->hist_data->event_file;
6094 cmd = hist_data->field_var_hists[i]->cmd;
6095 ret = event_hist_trigger_parse(&trigger_hist_cmd, file,
6096 "!hist", "hist", cmd);
6097 WARN_ON_ONCE(ret < 0);
6101 static void event_hist_trigger_free(struct event_trigger_data *data)
6103 struct hist_trigger_data *hist_data = data->private_data;
6105 if (WARN_ON_ONCE(data->ref <= 0))
6111 del_named_trigger(data);
6113 trigger_data_free(data);
6115 remove_hist_vars(hist_data);
6117 unregister_field_var_hists(hist_data);
6119 destroy_hist_data(hist_data);
6123 static struct event_trigger_ops event_hist_trigger_ops = {
6124 .trigger = event_hist_trigger,
6125 .print = event_hist_trigger_print,
6126 .init = event_hist_trigger_init,
6127 .free = event_hist_trigger_free,
6130 static int event_hist_trigger_named_init(struct event_trigger_data *data)
6134 save_named_trigger(data->named_data->name, data);
6136 event_hist_trigger_init(data->named_data);
6141 static void event_hist_trigger_named_free(struct event_trigger_data *data)
6143 if (WARN_ON_ONCE(data->ref <= 0))
6146 event_hist_trigger_free(data->named_data);
6150 del_named_trigger(data);
6151 trigger_data_free(data);
6155 static struct event_trigger_ops event_hist_trigger_named_ops = {
6156 .trigger = event_hist_trigger,
6157 .print = event_hist_trigger_print,
6158 .init = event_hist_trigger_named_init,
6159 .free = event_hist_trigger_named_free,
6162 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
6165 return &event_hist_trigger_ops;
6168 static void hist_clear(struct event_trigger_data *data)
6170 struct hist_trigger_data *hist_data = data->private_data;
6173 pause_named_trigger(data);
6175 tracepoint_synchronize_unregister();
6177 tracing_map_clear(hist_data->map);
6180 unpause_named_trigger(data);
6183 static bool compatible_field(struct ftrace_event_field *field,
6184 struct ftrace_event_field *test_field)
6186 if (field == test_field)
6188 if (field == NULL || test_field == NULL)
6190 if (strcmp(field->name, test_field->name) != 0)
6192 if (strcmp(field->type, test_field->type) != 0)
6194 if (field->size != test_field->size)
6196 if (field->is_signed != test_field->is_signed)
6202 static bool hist_trigger_match(struct event_trigger_data *data,
6203 struct event_trigger_data *data_test,
6204 struct event_trigger_data *named_data,
6207 struct tracing_map_sort_key *sort_key, *sort_key_test;
6208 struct hist_trigger_data *hist_data, *hist_data_test;
6209 struct hist_field *key_field, *key_field_test;
6212 if (named_data && (named_data != data_test) &&
6213 (named_data != data_test->named_data))
6216 if (!named_data && is_named_trigger(data_test))
6219 hist_data = data->private_data;
6220 hist_data_test = data_test->private_data;
6222 if (hist_data->n_vals != hist_data_test->n_vals ||
6223 hist_data->n_fields != hist_data_test->n_fields ||
6224 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
6227 if (!ignore_filter) {
6228 if ((data->filter_str && !data_test->filter_str) ||
6229 (!data->filter_str && data_test->filter_str))
6233 for_each_hist_field(i, hist_data) {
6234 key_field = hist_data->fields[i];
6235 key_field_test = hist_data_test->fields[i];
6237 if (key_field->flags != key_field_test->flags)
6239 if (!compatible_field(key_field->field, key_field_test->field))
6241 if (key_field->offset != key_field_test->offset)
6243 if (key_field->size != key_field_test->size)
6245 if (key_field->is_signed != key_field_test->is_signed)
6247 if (!!key_field->var.name != !!key_field_test->var.name)
6249 if (key_field->var.name &&
6250 strcmp(key_field->var.name, key_field_test->var.name) != 0)
6254 for (i = 0; i < hist_data->n_sort_keys; i++) {
6255 sort_key = &hist_data->sort_keys[i];
6256 sort_key_test = &hist_data_test->sort_keys[i];
6258 if (sort_key->field_idx != sort_key_test->field_idx ||
6259 sort_key->descending != sort_key_test->descending)
6263 if (!ignore_filter && data->filter_str &&
6264 (strcmp(data->filter_str, data_test->filter_str) != 0))
6267 if (!actions_match(hist_data, hist_data_test))
6273 static bool existing_hist_update_only(char *glob,
6274 struct event_trigger_data *data,
6275 struct trace_event_file *file)
6277 struct hist_trigger_data *hist_data = data->private_data;
6278 struct event_trigger_data *test, *named_data = NULL;
6279 bool updated = false;
6281 if (!hist_data->attrs->pause && !hist_data->attrs->cont &&
6282 !hist_data->attrs->clear)
6285 if (hist_data->attrs->name) {
6286 named_data = find_named_trigger(hist_data->attrs->name);
6288 if (!hist_trigger_match(data, named_data, named_data,
6294 if (hist_data->attrs->name && !named_data)
6297 list_for_each_entry(test, &file->triggers, list) {
6298 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6299 if (!hist_trigger_match(data, test, named_data, false))
6301 if (hist_data->attrs->pause)
6302 test->paused = true;
6303 else if (hist_data->attrs->cont)
6304 test->paused = false;
6305 else if (hist_data->attrs->clear)
6315 static int hist_register_trigger(char *glob,
6316 struct event_trigger_data *data,
6317 struct trace_event_file *file)
6319 struct hist_trigger_data *hist_data = data->private_data;
6320 struct event_trigger_data *test, *named_data = NULL;
6321 struct trace_array *tr = file->tr;
6324 if (hist_data->attrs->name) {
6325 named_data = find_named_trigger(hist_data->attrs->name);
6327 if (!hist_trigger_match(data, named_data, named_data,
6329 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
6336 if (hist_data->attrs->name && !named_data)
6339 lockdep_assert_held(&event_mutex);
6341 list_for_each_entry(test, &file->triggers, list) {
6342 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6343 if (hist_trigger_match(data, test, named_data, false)) {
6344 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
6351 if (hist_data->attrs->cont || hist_data->attrs->clear) {
6352 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
6357 if (hist_data->attrs->pause)
6358 data->paused = true;
6361 data->private_data = named_data->private_data;
6362 set_named_trigger_data(data, named_data);
6363 data->ops = &event_hist_trigger_named_ops;
6366 if (data->ops->init) {
6367 ret = data->ops->init(data);
6372 if (hist_data->enable_timestamps) {
6373 char *clock = hist_data->attrs->clock;
6375 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
6377 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
6381 tracing_set_filter_buffering(file->tr, true);
6385 destroy_hist_data(hist_data);
6390 static int hist_trigger_enable(struct event_trigger_data *data,
6391 struct trace_event_file *file)
6395 list_add_tail_rcu(&data->list, &file->triggers);
6397 update_cond_flag(file);
6399 if (trace_event_trigger_enable_disable(file, 1) < 0) {
6400 list_del_rcu(&data->list);
6401 update_cond_flag(file);
6408 static bool have_hist_trigger_match(struct event_trigger_data *data,
6409 struct trace_event_file *file)
6411 struct hist_trigger_data *hist_data = data->private_data;
6412 struct event_trigger_data *test, *named_data = NULL;
6415 lockdep_assert_held(&event_mutex);
6417 if (hist_data->attrs->name)
6418 named_data = find_named_trigger(hist_data->attrs->name);
6420 list_for_each_entry(test, &file->triggers, list) {
6421 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6422 if (hist_trigger_match(data, test, named_data, false)) {
6432 static bool hist_trigger_check_refs(struct event_trigger_data *data,
6433 struct trace_event_file *file)
6435 struct hist_trigger_data *hist_data = data->private_data;
6436 struct event_trigger_data *test, *named_data = NULL;
6438 lockdep_assert_held(&event_mutex);
6440 if (hist_data->attrs->name)
6441 named_data = find_named_trigger(hist_data->attrs->name);
6443 list_for_each_entry(test, &file->triggers, list) {
6444 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6445 if (!hist_trigger_match(data, test, named_data, false))
6447 hist_data = test->private_data;
6448 if (check_var_refs(hist_data))
6457 static void hist_unregister_trigger(char *glob,
6458 struct event_trigger_data *data,
6459 struct trace_event_file *file)
6461 struct event_trigger_data *test = NULL, *iter, *named_data = NULL;
6462 struct hist_trigger_data *hist_data = data->private_data;
6464 lockdep_assert_held(&event_mutex);
6466 if (hist_data->attrs->name)
6467 named_data = find_named_trigger(hist_data->attrs->name);
6469 list_for_each_entry(iter, &file->triggers, list) {
6470 if (iter->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6471 if (!hist_trigger_match(data, iter, named_data, false))
6474 list_del_rcu(&test->list);
6475 trace_event_trigger_enable_disable(file, 0);
6476 update_cond_flag(file);
6481 if (test && test->ops->free)
6482 test->ops->free(test);
6484 if (hist_data->enable_timestamps) {
6485 if (!hist_data->remove || test)
6486 tracing_set_filter_buffering(file->tr, false);
6490 static bool hist_file_check_refs(struct trace_event_file *file)
6492 struct hist_trigger_data *hist_data;
6493 struct event_trigger_data *test;
6495 lockdep_assert_held(&event_mutex);
6497 list_for_each_entry(test, &file->triggers, list) {
6498 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6499 hist_data = test->private_data;
6500 if (check_var_refs(hist_data))
6508 static void hist_unreg_all(struct trace_event_file *file)
6510 struct event_trigger_data *test, *n;
6511 struct hist_trigger_data *hist_data;
6512 struct synth_event *se;
6513 const char *se_name;
6515 lockdep_assert_held(&event_mutex);
6517 if (hist_file_check_refs(file))
6520 list_for_each_entry_safe(test, n, &file->triggers, list) {
6521 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6522 hist_data = test->private_data;
6523 list_del_rcu(&test->list);
6524 trace_event_trigger_enable_disable(file, 0);
6526 se_name = trace_event_name(file->event_call);
6527 se = find_synth_event(se_name);
6531 update_cond_flag(file);
6532 if (hist_data->enable_timestamps)
6533 tracing_set_filter_buffering(file->tr, false);
6534 if (test->ops->free)
6535 test->ops->free(test);
6540 static int event_hist_trigger_parse(struct event_command *cmd_ops,
6541 struct trace_event_file *file,
6542 char *glob, char *cmd,
6543 char *param_and_filter)
6545 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6546 struct event_trigger_data *trigger_data;
6547 struct hist_trigger_attrs *attrs;
6548 struct hist_trigger_data *hist_data;
6549 char *param, *filter, *p, *start;
6550 struct synth_event *se;
6551 const char *se_name;
6555 lockdep_assert_held(&event_mutex);
6562 last_cmd_set(file, param_and_filter);
6565 remove = event_trigger_check_remove(glob);
6567 if (event_trigger_empty_param(param_and_filter))
6571 * separate the trigger from the filter (k:v [if filter])
6572 * allowing for whitespace in the trigger
6574 p = param = param_and_filter;
6576 p = strstr(p, "if");
6579 if (p == param_and_filter)
6581 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6585 if (p >= param_and_filter + strlen(param_and_filter) - (sizeof("if") - 1) - 1)
6587 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
6598 filter = strstrip(p);
6599 param = strstrip(param);
6603 * To simplify arithmetic expression parsing, replace occurrences of
6604 * '.sym-offset' modifier with '.symXoffset'
6606 start = strstr(param, ".sym-offset");
6609 start = strstr(start + 11, ".sym-offset");
6612 attrs = parse_hist_trigger_attrs(file->tr, param);
6614 return PTR_ERR(attrs);
6616 if (attrs->map_bits)
6617 hist_trigger_bits = attrs->map_bits;
6619 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
6620 if (IS_ERR(hist_data)) {
6621 destroy_hist_trigger_attrs(attrs);
6622 return PTR_ERR(hist_data);
6625 trigger_data = event_trigger_alloc(cmd_ops, cmd, param, hist_data);
6626 if (!trigger_data) {
6631 ret = event_trigger_set_filter(cmd_ops, file, filter, trigger_data);
6636 if (!have_hist_trigger_match(trigger_data, file))
6639 if (hist_trigger_check_refs(trigger_data, file)) {
6644 event_trigger_unregister(cmd_ops, file, glob+1, trigger_data);
6645 se_name = trace_event_name(file->event_call);
6646 se = find_synth_event(se_name);
6653 if (existing_hist_update_only(glob, trigger_data, file))
6656 ret = event_trigger_register(cmd_ops, file, glob, trigger_data);
6660 if (get_named_trigger_data(trigger_data))
6663 ret = create_actions(hist_data);
6667 if (has_hist_vars(hist_data) || hist_data->n_var_refs) {
6668 ret = save_hist_vars(hist_data);
6673 ret = tracing_map_init(hist_data->map);
6677 ret = hist_trigger_enable(trigger_data, file);
6681 se_name = trace_event_name(file->event_call);
6682 se = find_synth_event(se_name);
6686 if (ret == 0 && glob[0])
6691 event_trigger_unregister(cmd_ops, file, glob+1, trigger_data);
6693 event_trigger_reset_filter(cmd_ops, trigger_data);
6695 remove_hist_vars(hist_data);
6697 kfree(trigger_data);
6699 destroy_hist_data(hist_data);
6703 static struct event_command trigger_hist_cmd = {
6705 .trigger_type = ETT_EVENT_HIST,
6706 .flags = EVENT_CMD_FL_NEEDS_REC,
6707 .parse = event_hist_trigger_parse,
6708 .reg = hist_register_trigger,
6709 .unreg = hist_unregister_trigger,
6710 .unreg_all = hist_unreg_all,
6711 .get_trigger_ops = event_hist_get_trigger_ops,
6712 .set_filter = set_trigger_filter,
6715 __init int register_trigger_hist_cmd(void)
6719 ret = register_event_command(&trigger_hist_cmd);
6726 hist_enable_trigger(struct event_trigger_data *data,
6727 struct trace_buffer *buffer, void *rec,
6728 struct ring_buffer_event *event)
6730 struct enable_trigger_data *enable_data = data->private_data;
6731 struct event_trigger_data *test;
6733 list_for_each_entry_rcu(test, &enable_data->file->triggers, list,
6734 lockdep_is_held(&event_mutex)) {
6735 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6736 if (enable_data->enable)
6737 test->paused = false;
6739 test->paused = true;
6745 hist_enable_count_trigger(struct event_trigger_data *data,
6746 struct trace_buffer *buffer, void *rec,
6747 struct ring_buffer_event *event)
6752 if (data->count != -1)
6755 hist_enable_trigger(data, buffer, rec, event);
6758 static struct event_trigger_ops hist_enable_trigger_ops = {
6759 .trigger = hist_enable_trigger,
6760 .print = event_enable_trigger_print,
6761 .init = event_trigger_init,
6762 .free = event_enable_trigger_free,
6765 static struct event_trigger_ops hist_enable_count_trigger_ops = {
6766 .trigger = hist_enable_count_trigger,
6767 .print = event_enable_trigger_print,
6768 .init = event_trigger_init,
6769 .free = event_enable_trigger_free,
6772 static struct event_trigger_ops hist_disable_trigger_ops = {
6773 .trigger = hist_enable_trigger,
6774 .print = event_enable_trigger_print,
6775 .init = event_trigger_init,
6776 .free = event_enable_trigger_free,
6779 static struct event_trigger_ops hist_disable_count_trigger_ops = {
6780 .trigger = hist_enable_count_trigger,
6781 .print = event_enable_trigger_print,
6782 .init = event_trigger_init,
6783 .free = event_enable_trigger_free,
6786 static struct event_trigger_ops *
6787 hist_enable_get_trigger_ops(char *cmd, char *param)
6789 struct event_trigger_ops *ops;
6792 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6795 ops = param ? &hist_enable_count_trigger_ops :
6796 &hist_enable_trigger_ops;
6798 ops = param ? &hist_disable_count_trigger_ops :
6799 &hist_disable_trigger_ops;
6804 static void hist_enable_unreg_all(struct trace_event_file *file)
6806 struct event_trigger_data *test, *n;
6808 list_for_each_entry_safe(test, n, &file->triggers, list) {
6809 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6810 list_del_rcu(&test->list);
6811 update_cond_flag(file);
6812 trace_event_trigger_enable_disable(file, 0);
6813 if (test->ops->free)
6814 test->ops->free(test);
6819 static struct event_command trigger_hist_enable_cmd = {
6820 .name = ENABLE_HIST_STR,
6821 .trigger_type = ETT_HIST_ENABLE,
6822 .parse = event_enable_trigger_parse,
6823 .reg = event_enable_register_trigger,
6824 .unreg = event_enable_unregister_trigger,
6825 .unreg_all = hist_enable_unreg_all,
6826 .get_trigger_ops = hist_enable_get_trigger_ops,
6827 .set_filter = set_trigger_filter,
6830 static struct event_command trigger_hist_disable_cmd = {
6831 .name = DISABLE_HIST_STR,
6832 .trigger_type = ETT_HIST_ENABLE,
6833 .parse = event_enable_trigger_parse,
6834 .reg = event_enable_register_trigger,
6835 .unreg = event_enable_unregister_trigger,
6836 .unreg_all = hist_enable_unreg_all,
6837 .get_trigger_ops = hist_enable_get_trigger_ops,
6838 .set_filter = set_trigger_filter,
6841 static __init void unregister_trigger_hist_enable_disable_cmds(void)
6843 unregister_event_command(&trigger_hist_enable_cmd);
6844 unregister_event_command(&trigger_hist_disable_cmd);
6847 __init int register_trigger_hist_enable_disable_cmds(void)
6851 ret = register_event_command(&trigger_hist_enable_cmd);
6852 if (WARN_ON(ret < 0))
6854 ret = register_event_command(&trigger_hist_disable_cmd);
6855 if (WARN_ON(ret < 0))
6856 unregister_trigger_hist_enable_disable_cmds();