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"),
71 #define C(a, b) HIST_ERR_##a
78 static const char *err_text[] = { ERRORS };
82 typedef u64 (*hist_field_fn_t) (struct hist_field *field,
83 struct tracing_map_elt *elt,
84 struct trace_buffer *buffer,
85 struct ring_buffer_event *rbe,
88 #define HIST_FIELD_OPERANDS_MAX 2
89 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
90 #define HIST_ACTIONS_MAX 8
100 * A hist_var (histogram variable) contains variable information for
101 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
102 * flag set. A hist_var has a variable name e.g. ts0, and is
103 * associated with a given histogram trigger, as specified by
104 * hist_data. The hist_var idx is the unique index assigned to the
105 * variable by the hist trigger's tracing_map. The idx is what is
106 * used to set a variable's value and, by a variable reference, to
111 struct hist_trigger_data *hist_data;
116 struct ftrace_event_field *field;
122 unsigned int is_signed;
124 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
125 struct hist_trigger_data *hist_data;
128 * Variable fields contain variable-specific info in var.
131 enum field_op_id operator;
136 * The name field is used for EXPR and VAR_REF fields. VAR
137 * fields contain the variable name in var.name.
142 * When a histogram trigger is hit, if it has any references
143 * to variables, the values of those variables are collected
144 * into a var_ref_vals array by resolve_var_refs(). The
145 * current value of each variable is read from the tracing_map
146 * using the hist field's hist_var.idx and entered into the
147 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
149 unsigned int var_ref_idx;
152 unsigned int var_str_idx;
155 static u64 hist_field_none(struct hist_field *field,
156 struct tracing_map_elt *elt,
157 struct trace_buffer *buffer,
158 struct ring_buffer_event *rbe,
164 static u64 hist_field_counter(struct hist_field *field,
165 struct tracing_map_elt *elt,
166 struct trace_buffer *buffer,
167 struct ring_buffer_event *rbe,
173 static u64 hist_field_string(struct hist_field *hist_field,
174 struct tracing_map_elt *elt,
175 struct trace_buffer *buffer,
176 struct ring_buffer_event *rbe,
179 char *addr = (char *)(event + hist_field->field->offset);
181 return (u64)(unsigned long)addr;
184 static u64 hist_field_dynstring(struct hist_field *hist_field,
185 struct tracing_map_elt *elt,
186 struct trace_buffer *buffer,
187 struct ring_buffer_event *rbe,
190 u32 str_item = *(u32 *)(event + hist_field->field->offset);
191 int str_loc = str_item & 0xffff;
192 char *addr = (char *)(event + str_loc);
194 return (u64)(unsigned long)addr;
197 static u64 hist_field_pstring(struct hist_field *hist_field,
198 struct tracing_map_elt *elt,
199 struct trace_buffer *buffer,
200 struct ring_buffer_event *rbe,
203 char **addr = (char **)(event + hist_field->field->offset);
205 return (u64)(unsigned long)*addr;
208 static u64 hist_field_log2(struct hist_field *hist_field,
209 struct tracing_map_elt *elt,
210 struct trace_buffer *buffer,
211 struct ring_buffer_event *rbe,
214 struct hist_field *operand = hist_field->operands[0];
216 u64 val = operand->fn(operand, elt, buffer, rbe, event);
218 return (u64) ilog2(roundup_pow_of_two(val));
221 static u64 hist_field_plus(struct hist_field *hist_field,
222 struct tracing_map_elt *elt,
223 struct trace_buffer *buffer,
224 struct ring_buffer_event *rbe,
227 struct hist_field *operand1 = hist_field->operands[0];
228 struct hist_field *operand2 = hist_field->operands[1];
230 u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
231 u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
236 static u64 hist_field_minus(struct hist_field *hist_field,
237 struct tracing_map_elt *elt,
238 struct trace_buffer *buffer,
239 struct ring_buffer_event *rbe,
242 struct hist_field *operand1 = hist_field->operands[0];
243 struct hist_field *operand2 = hist_field->operands[1];
245 u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
246 u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
251 static u64 hist_field_unary_minus(struct hist_field *hist_field,
252 struct tracing_map_elt *elt,
253 struct trace_buffer *buffer,
254 struct ring_buffer_event *rbe,
257 struct hist_field *operand = hist_field->operands[0];
259 s64 sval = (s64)operand->fn(operand, elt, buffer, rbe, event);
260 u64 val = (u64)-sval;
265 #define DEFINE_HIST_FIELD_FN(type) \
266 static u64 hist_field_##type(struct hist_field *hist_field, \
267 struct tracing_map_elt *elt, \
268 struct trace_buffer *buffer, \
269 struct ring_buffer_event *rbe, \
272 type *addr = (type *)(event + hist_field->field->offset); \
274 return (u64)(unsigned long)*addr; \
277 DEFINE_HIST_FIELD_FN(s64);
278 DEFINE_HIST_FIELD_FN(u64);
279 DEFINE_HIST_FIELD_FN(s32);
280 DEFINE_HIST_FIELD_FN(u32);
281 DEFINE_HIST_FIELD_FN(s16);
282 DEFINE_HIST_FIELD_FN(u16);
283 DEFINE_HIST_FIELD_FN(s8);
284 DEFINE_HIST_FIELD_FN(u8);
286 #define for_each_hist_field(i, hist_data) \
287 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
289 #define for_each_hist_val_field(i, hist_data) \
290 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
292 #define for_each_hist_key_field(i, hist_data) \
293 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
295 #define HIST_STACKTRACE_DEPTH 16
296 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
297 #define HIST_STACKTRACE_SKIP 5
299 #define HITCOUNT_IDX 0
300 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
302 enum hist_field_flags {
303 HIST_FIELD_FL_HITCOUNT = 1 << 0,
304 HIST_FIELD_FL_KEY = 1 << 1,
305 HIST_FIELD_FL_STRING = 1 << 2,
306 HIST_FIELD_FL_HEX = 1 << 3,
307 HIST_FIELD_FL_SYM = 1 << 4,
308 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
309 HIST_FIELD_FL_EXECNAME = 1 << 6,
310 HIST_FIELD_FL_SYSCALL = 1 << 7,
311 HIST_FIELD_FL_STACKTRACE = 1 << 8,
312 HIST_FIELD_FL_LOG2 = 1 << 9,
313 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
314 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
315 HIST_FIELD_FL_VAR = 1 << 12,
316 HIST_FIELD_FL_EXPR = 1 << 13,
317 HIST_FIELD_FL_VAR_REF = 1 << 14,
318 HIST_FIELD_FL_CPU = 1 << 15,
319 HIST_FIELD_FL_ALIAS = 1 << 16,
324 char *name[TRACING_MAP_VARS_MAX];
325 char *expr[TRACING_MAP_VARS_MAX];
328 struct hist_trigger_attrs {
338 unsigned int map_bits;
340 char *assignment_str[TRACING_MAP_VARS_MAX];
341 unsigned int n_assignments;
343 char *action_str[HIST_ACTIONS_MAX];
344 unsigned int n_actions;
346 struct var_defs var_defs;
350 struct hist_field *var;
351 struct hist_field *val;
354 struct field_var_hist {
355 struct hist_trigger_data *hist_data;
359 struct hist_trigger_data {
360 struct hist_field *fields[HIST_FIELDS_MAX];
363 unsigned int n_fields;
365 unsigned int n_var_str;
366 unsigned int key_size;
367 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
368 unsigned int n_sort_keys;
369 struct trace_event_file *event_file;
370 struct hist_trigger_attrs *attrs;
371 struct tracing_map *map;
372 bool enable_timestamps;
374 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
375 unsigned int n_var_refs;
377 struct action_data *actions[HIST_ACTIONS_MAX];
378 unsigned int n_actions;
380 struct field_var *field_vars[SYNTH_FIELDS_MAX];
381 unsigned int n_field_vars;
382 unsigned int n_field_var_str;
383 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
384 unsigned int n_field_var_hists;
386 struct field_var *save_vars[SYNTH_FIELDS_MAX];
387 unsigned int n_save_vars;
388 unsigned int n_save_var_str;
393 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
394 struct tracing_map_elt *elt,
395 struct trace_buffer *buffer, void *rec,
396 struct ring_buffer_event *rbe, void *key,
397 struct action_data *data, u64 *var_ref_vals);
399 typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
414 enum handler_id handler;
415 enum action_id action;
419 unsigned int n_params;
420 char *params[SYNTH_FIELDS_MAX];
423 * When a histogram trigger is hit, the values of any
424 * references to variables, including variables being passed
425 * as parameters to synthetic events, are collected into a
426 * var_ref_vals array. This var_ref_idx array is an array of
427 * indices into the var_ref_vals array, one for each synthetic
428 * event param, and is passed to the synthetic event
431 unsigned int var_ref_idx[TRACING_MAP_VARS_MAX];
432 struct synth_event *synth_event;
433 bool use_trace_keyword;
434 char *synth_event_name;
444 * var_str contains the $-unstripped variable
445 * name referenced by var_ref, and used when
446 * printing the action. Because var_ref
447 * creation is deferred to create_actions(),
448 * we need a per-action way to save it until
449 * then, thus var_str.
454 * var_ref refers to the variable being
455 * tracked e.g onmax($var).
457 struct hist_field *var_ref;
460 * track_var contains the 'invisible' tracking
461 * variable created to keep the current
464 struct hist_field *track_var;
466 check_track_val_fn_t check_val;
467 action_fn_t save_data;
476 unsigned int key_len;
478 struct tracing_map_elt elt;
480 struct action_data *action_data;
481 struct hist_trigger_data *hist_data;
484 struct hist_elt_data {
487 char *field_var_str[SYNTH_FIELDS_MAX];
490 struct snapshot_context {
491 struct tracing_map_elt *elt;
495 static void track_data_free(struct track_data *track_data)
497 struct hist_elt_data *elt_data;
502 kfree(track_data->key);
504 elt_data = track_data->elt.private_data;
506 kfree(elt_data->comm);
513 static struct track_data *track_data_alloc(unsigned int key_len,
514 struct action_data *action_data,
515 struct hist_trigger_data *hist_data)
517 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
518 struct hist_elt_data *elt_data;
521 return ERR_PTR(-ENOMEM);
523 data->key = kzalloc(key_len, GFP_KERNEL);
525 track_data_free(data);
526 return ERR_PTR(-ENOMEM);
529 data->key_len = key_len;
530 data->action_data = action_data;
531 data->hist_data = hist_data;
533 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
535 track_data_free(data);
536 return ERR_PTR(-ENOMEM);
539 data->elt.private_data = elt_data;
541 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
542 if (!elt_data->comm) {
543 track_data_free(data);
544 return ERR_PTR(-ENOMEM);
550 static char last_cmd[MAX_FILTER_STR_VAL];
551 static char last_cmd_loc[MAX_FILTER_STR_VAL];
553 static int errpos(char *str)
555 return err_pos(last_cmd, str);
558 static void last_cmd_set(struct trace_event_file *file, char *str)
560 const char *system = NULL, *name = NULL;
561 struct trace_event_call *call;
566 strcpy(last_cmd, "hist:");
567 strncat(last_cmd, str, MAX_FILTER_STR_VAL - 1 - sizeof("hist:"));
570 call = file->event_call;
571 system = call->class->system;
573 name = trace_event_name(call);
580 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
583 static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
585 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
589 static void hist_err_clear(void)
592 last_cmd_loc[0] = '\0';
595 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
596 unsigned int *var_ref_idx);
598 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
599 unsigned int *var_ref_idx)
601 struct tracepoint *tp = event->tp;
603 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
604 struct tracepoint_func *probe_func_ptr;
605 synth_probe_func_t probe_func;
608 if (!(cpu_online(raw_smp_processor_id())))
611 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
612 if (probe_func_ptr) {
614 probe_func = probe_func_ptr->func;
615 __data = probe_func_ptr->data;
616 probe_func(__data, var_ref_vals, var_ref_idx);
617 } while ((++probe_func_ptr)->func);
622 static void action_trace(struct hist_trigger_data *hist_data,
623 struct tracing_map_elt *elt,
624 struct trace_buffer *buffer, void *rec,
625 struct ring_buffer_event *rbe, void *key,
626 struct action_data *data, u64 *var_ref_vals)
628 struct synth_event *event = data->synth_event;
630 trace_synth(event, var_ref_vals, data->var_ref_idx);
633 struct hist_var_data {
634 struct list_head list;
635 struct hist_trigger_data *hist_data;
638 static u64 hist_field_timestamp(struct hist_field *hist_field,
639 struct tracing_map_elt *elt,
640 struct trace_buffer *buffer,
641 struct ring_buffer_event *rbe,
644 struct hist_trigger_data *hist_data = hist_field->hist_data;
645 struct trace_array *tr = hist_data->event_file->tr;
647 u64 ts = ring_buffer_event_time_stamp(buffer, rbe);
649 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
655 static u64 hist_field_cpu(struct hist_field *hist_field,
656 struct tracing_map_elt *elt,
657 struct trace_buffer *buffer,
658 struct ring_buffer_event *rbe,
661 int cpu = smp_processor_id();
667 * check_field_for_var_ref - Check if a VAR_REF field references a variable
668 * @hist_field: The VAR_REF field to check
669 * @var_data: The hist trigger that owns the variable
670 * @var_idx: The trigger variable identifier
672 * Check the given VAR_REF field to see whether or not it references
673 * the given variable associated with the given trigger.
675 * Return: The VAR_REF field if it does reference the variable, NULL if not
677 static struct hist_field *
678 check_field_for_var_ref(struct hist_field *hist_field,
679 struct hist_trigger_data *var_data,
680 unsigned int var_idx)
682 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
684 if (hist_field && hist_field->var.idx == var_idx &&
685 hist_field->var.hist_data == var_data)
692 * find_var_ref - Check if a trigger has a reference to a trigger variable
693 * @hist_data: The hist trigger that might have a reference to the variable
694 * @var_data: The hist trigger that owns the variable
695 * @var_idx: The trigger variable identifier
697 * Check the list of var_refs[] on the first hist trigger to see
698 * whether any of them are references to the variable on the second
701 * Return: The VAR_REF field referencing the variable if so, NULL if not
703 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
704 struct hist_trigger_data *var_data,
705 unsigned int var_idx)
707 struct hist_field *hist_field;
710 for (i = 0; i < hist_data->n_var_refs; i++) {
711 hist_field = hist_data->var_refs[i];
712 if (check_field_for_var_ref(hist_field, var_data, var_idx))
720 * find_any_var_ref - Check if there is a reference to a given trigger variable
721 * @hist_data: The hist trigger
722 * @var_idx: The trigger variable identifier
724 * Check to see whether the given variable is currently referenced by
727 * The trigger the variable is defined on is explicitly excluded - the
728 * assumption being that a self-reference doesn't prevent a trigger
729 * from being removed.
731 * Return: The VAR_REF field referencing the variable if so, NULL if not
733 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
734 unsigned int var_idx)
736 struct trace_array *tr = hist_data->event_file->tr;
737 struct hist_field *found = NULL;
738 struct hist_var_data *var_data;
740 list_for_each_entry(var_data, &tr->hist_vars, list) {
741 if (var_data->hist_data == hist_data)
743 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
752 * check_var_refs - Check if there is a reference to any of trigger's variables
753 * @hist_data: The hist trigger
755 * A trigger can define one or more variables. If any one of them is
756 * currently referenced by any other trigger, this function will
759 * Typically used to determine whether or not a trigger can be removed
760 * - if there are any references to a trigger's variables, it cannot.
762 * Return: True if there is a reference to any of trigger's variables
764 static bool check_var_refs(struct hist_trigger_data *hist_data)
766 struct hist_field *field;
770 for_each_hist_field(i, hist_data) {
771 field = hist_data->fields[i];
772 if (field && field->flags & HIST_FIELD_FL_VAR) {
773 if (find_any_var_ref(hist_data, field->var.idx)) {
783 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
785 struct trace_array *tr = hist_data->event_file->tr;
786 struct hist_var_data *var_data, *found = NULL;
788 list_for_each_entry(var_data, &tr->hist_vars, list) {
789 if (var_data->hist_data == hist_data) {
798 static bool field_has_hist_vars(struct hist_field *hist_field,
809 if (hist_field->flags & HIST_FIELD_FL_VAR ||
810 hist_field->flags & HIST_FIELD_FL_VAR_REF)
813 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
814 struct hist_field *operand;
816 operand = hist_field->operands[i];
817 if (field_has_hist_vars(operand, level + 1))
824 static bool has_hist_vars(struct hist_trigger_data *hist_data)
826 struct hist_field *hist_field;
829 for_each_hist_field(i, hist_data) {
830 hist_field = hist_data->fields[i];
831 if (field_has_hist_vars(hist_field, 0))
838 static int save_hist_vars(struct hist_trigger_data *hist_data)
840 struct trace_array *tr = hist_data->event_file->tr;
841 struct hist_var_data *var_data;
843 var_data = find_hist_vars(hist_data);
847 if (tracing_check_open_get_tr(tr))
850 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
856 var_data->hist_data = hist_data;
857 list_add(&var_data->list, &tr->hist_vars);
862 static void remove_hist_vars(struct hist_trigger_data *hist_data)
864 struct trace_array *tr = hist_data->event_file->tr;
865 struct hist_var_data *var_data;
867 var_data = find_hist_vars(hist_data);
871 if (WARN_ON(check_var_refs(hist_data)))
874 list_del(&var_data->list);
881 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
882 const char *var_name)
884 struct hist_field *hist_field, *found = NULL;
887 for_each_hist_field(i, hist_data) {
888 hist_field = hist_data->fields[i];
889 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
890 strcmp(hist_field->var.name, var_name) == 0) {
899 static struct hist_field *find_var(struct hist_trigger_data *hist_data,
900 struct trace_event_file *file,
901 const char *var_name)
903 struct hist_trigger_data *test_data;
904 struct event_trigger_data *test;
905 struct hist_field *hist_field;
907 lockdep_assert_held(&event_mutex);
909 hist_field = find_var_field(hist_data, var_name);
913 list_for_each_entry(test, &file->triggers, list) {
914 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
915 test_data = test->private_data;
916 hist_field = find_var_field(test_data, var_name);
925 static struct trace_event_file *find_var_file(struct trace_array *tr,
930 struct hist_trigger_data *var_hist_data;
931 struct hist_var_data *var_data;
932 struct trace_event_file *file, *found = NULL;
935 return find_event_file(tr, system, event_name);
937 list_for_each_entry(var_data, &tr->hist_vars, list) {
938 var_hist_data = var_data->hist_data;
939 file = var_hist_data->event_file;
943 if (find_var_field(var_hist_data, var_name)) {
945 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
956 static struct hist_field *find_file_var(struct trace_event_file *file,
957 const char *var_name)
959 struct hist_trigger_data *test_data;
960 struct event_trigger_data *test;
961 struct hist_field *hist_field;
963 lockdep_assert_held(&event_mutex);
965 list_for_each_entry(test, &file->triggers, list) {
966 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
967 test_data = test->private_data;
968 hist_field = find_var_field(test_data, var_name);
977 static struct hist_field *
978 find_match_var(struct hist_trigger_data *hist_data, char *var_name)
980 struct trace_array *tr = hist_data->event_file->tr;
981 struct hist_field *hist_field, *found = NULL;
982 struct trace_event_file *file;
985 for (i = 0; i < hist_data->n_actions; i++) {
986 struct action_data *data = hist_data->actions[i];
988 if (data->handler == HANDLER_ONMATCH) {
989 char *system = data->match_data.event_system;
990 char *event_name = data->match_data.event;
992 file = find_var_file(tr, system, event_name, var_name);
995 hist_field = find_file_var(file, var_name);
998 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1000 return ERR_PTR(-EINVAL);
1010 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1015 struct trace_array *tr = hist_data->event_file->tr;
1016 struct hist_field *hist_field = NULL;
1017 struct trace_event_file *file;
1019 if (!system || !event_name) {
1020 hist_field = find_match_var(hist_data, var_name);
1021 if (IS_ERR(hist_field))
1027 file = find_var_file(tr, system, event_name, var_name);
1031 hist_field = find_file_var(file, var_name);
1036 static u64 hist_field_var_ref(struct hist_field *hist_field,
1037 struct tracing_map_elt *elt,
1038 struct trace_buffer *buffer,
1039 struct ring_buffer_event *rbe,
1042 struct hist_elt_data *elt_data;
1045 if (WARN_ON_ONCE(!elt))
1048 elt_data = elt->private_data;
1049 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1054 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1055 u64 *var_ref_vals, bool self)
1057 struct hist_trigger_data *var_data;
1058 struct tracing_map_elt *var_elt;
1059 struct hist_field *hist_field;
1060 unsigned int i, var_idx;
1061 bool resolved = true;
1064 for (i = 0; i < hist_data->n_var_refs; i++) {
1065 hist_field = hist_data->var_refs[i];
1066 var_idx = hist_field->var.idx;
1067 var_data = hist_field->var.hist_data;
1069 if (var_data == NULL) {
1074 if ((self && var_data != hist_data) ||
1075 (!self && var_data == hist_data))
1078 var_elt = tracing_map_lookup(var_data->map, key);
1084 if (!tracing_map_var_set(var_elt, var_idx)) {
1089 if (self || !hist_field->read_once)
1090 var_val = tracing_map_read_var(var_elt, var_idx);
1092 var_val = tracing_map_read_var_once(var_elt, var_idx);
1094 var_ref_vals[i] = var_val;
1100 static const char *hist_field_name(struct hist_field *field,
1103 const char *field_name = "";
1109 field_name = field->field->name;
1110 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1111 field->flags & HIST_FIELD_FL_ALIAS)
1112 field_name = hist_field_name(field->operands[0], ++level);
1113 else if (field->flags & HIST_FIELD_FL_CPU)
1115 else if (field->flags & HIST_FIELD_FL_EXPR ||
1116 field->flags & HIST_FIELD_FL_VAR_REF) {
1117 if (field->system) {
1118 static char full_name[MAX_FILTER_STR_VAL];
1120 strcat(full_name, field->system);
1121 strcat(full_name, ".");
1122 strcat(full_name, field->event_name);
1123 strcat(full_name, ".");
1124 strcat(full_name, field->name);
1125 field_name = full_name;
1127 field_name = field->name;
1128 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1129 field_name = "common_timestamp";
1131 if (field_name == NULL)
1137 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1139 hist_field_fn_t fn = NULL;
1141 switch (field_size) {
1143 if (field_is_signed)
1144 fn = hist_field_s64;
1146 fn = hist_field_u64;
1149 if (field_is_signed)
1150 fn = hist_field_s32;
1152 fn = hist_field_u32;
1155 if (field_is_signed)
1156 fn = hist_field_s16;
1158 fn = hist_field_u16;
1161 if (field_is_signed)
1171 static int parse_map_size(char *str)
1173 unsigned long size, map_bits;
1176 ret = kstrtoul(str, 0, &size);
1180 map_bits = ilog2(roundup_pow_of_two(size));
1181 if (map_bits < TRACING_MAP_BITS_MIN ||
1182 map_bits > TRACING_MAP_BITS_MAX)
1190 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1197 for (i = 0; i < attrs->n_assignments; i++)
1198 kfree(attrs->assignment_str[i]);
1200 for (i = 0; i < attrs->n_actions; i++)
1201 kfree(attrs->action_str[i]);
1204 kfree(attrs->sort_key_str);
1205 kfree(attrs->keys_str);
1206 kfree(attrs->vals_str);
1207 kfree(attrs->clock);
1211 static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1215 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1218 if ((str_has_prefix(str, "onmatch(")) ||
1219 (str_has_prefix(str, "onmax(")) ||
1220 (str_has_prefix(str, "onchange("))) {
1221 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1222 if (!attrs->action_str[attrs->n_actions]) {
1232 static int parse_assignment(struct trace_array *tr,
1233 char *str, struct hist_trigger_attrs *attrs)
1237 if ((len = str_has_prefix(str, "key=")) ||
1238 (len = str_has_prefix(str, "keys="))) {
1239 attrs->keys_str = kstrdup(str + len, GFP_KERNEL);
1240 if (!attrs->keys_str) {
1244 } else if ((len = str_has_prefix(str, "val=")) ||
1245 (len = str_has_prefix(str, "vals=")) ||
1246 (len = str_has_prefix(str, "values="))) {
1247 attrs->vals_str = kstrdup(str + len, GFP_KERNEL);
1248 if (!attrs->vals_str) {
1252 } else if ((len = str_has_prefix(str, "sort="))) {
1253 attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL);
1254 if (!attrs->sort_key_str) {
1258 } else if (str_has_prefix(str, "name=")) {
1259 attrs->name = kstrdup(str, GFP_KERNEL);
1264 } else if ((len = str_has_prefix(str, "clock="))) {
1267 str = strstrip(str);
1268 attrs->clock = kstrdup(str, GFP_KERNEL);
1269 if (!attrs->clock) {
1273 } else if ((len = str_has_prefix(str, "size="))) {
1274 int map_bits = parse_map_size(str + len);
1280 attrs->map_bits = map_bits;
1284 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
1285 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
1290 assignment = kstrdup(str, GFP_KERNEL);
1296 attrs->assignment_str[attrs->n_assignments++] = assignment;
1302 static struct hist_trigger_attrs *
1303 parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
1305 struct hist_trigger_attrs *attrs;
1308 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1310 return ERR_PTR(-ENOMEM);
1312 while (trigger_str) {
1313 char *str = strsep(&trigger_str, ":");
1316 rhs = strchr(str, '=');
1318 if (!strlen(++rhs)) {
1320 hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str));
1323 ret = parse_assignment(tr, str, attrs);
1326 } else if (strcmp(str, "pause") == 0)
1327 attrs->pause = true;
1328 else if ((strcmp(str, "cont") == 0) ||
1329 (strcmp(str, "continue") == 0))
1331 else if (strcmp(str, "clear") == 0)
1332 attrs->clear = true;
1334 ret = parse_action(str, attrs);
1340 if (!attrs->keys_str) {
1345 if (!attrs->clock) {
1346 attrs->clock = kstrdup("global", GFP_KERNEL);
1347 if (!attrs->clock) {
1355 destroy_hist_trigger_attrs(attrs);
1357 return ERR_PTR(ret);
1360 static inline void save_comm(char *comm, struct task_struct *task)
1363 strcpy(comm, "<idle>");
1367 if (WARN_ON_ONCE(task->pid < 0)) {
1368 strcpy(comm, "<XXX>");
1372 strncpy(comm, task->comm, TASK_COMM_LEN);
1375 static void hist_elt_data_free(struct hist_elt_data *elt_data)
1379 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
1380 kfree(elt_data->field_var_str[i]);
1382 kfree(elt_data->comm);
1386 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
1388 struct hist_elt_data *elt_data = elt->private_data;
1390 hist_elt_data_free(elt_data);
1393 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
1395 struct hist_trigger_data *hist_data = elt->map->private_data;
1396 unsigned int size = TASK_COMM_LEN;
1397 struct hist_elt_data *elt_data;
1398 struct hist_field *key_field;
1399 unsigned int i, n_str;
1401 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
1405 for_each_hist_key_field(i, hist_data) {
1406 key_field = hist_data->fields[i];
1408 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
1409 elt_data->comm = kzalloc(size, GFP_KERNEL);
1410 if (!elt_data->comm) {
1418 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str +
1419 hist_data->n_var_str;
1420 if (n_str > SYNTH_FIELDS_MAX) {
1421 hist_elt_data_free(elt_data);
1425 BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
1427 size = STR_VAR_LEN_MAX;
1429 for (i = 0; i < n_str; i++) {
1430 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
1431 if (!elt_data->field_var_str[i]) {
1432 hist_elt_data_free(elt_data);
1437 elt->private_data = elt_data;
1442 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
1444 struct hist_elt_data *elt_data = elt->private_data;
1447 save_comm(elt_data->comm, current);
1450 static const struct tracing_map_ops hist_trigger_elt_data_ops = {
1451 .elt_alloc = hist_trigger_elt_data_alloc,
1452 .elt_free = hist_trigger_elt_data_free,
1453 .elt_init = hist_trigger_elt_data_init,
1456 static const char *get_hist_field_flags(struct hist_field *hist_field)
1458 const char *flags_str = NULL;
1460 if (hist_field->flags & HIST_FIELD_FL_HEX)
1462 else if (hist_field->flags & HIST_FIELD_FL_SYM)
1464 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
1465 flags_str = "sym-offset";
1466 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
1467 flags_str = "execname";
1468 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
1469 flags_str = "syscall";
1470 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
1472 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
1473 flags_str = "usecs";
1478 static void expr_field_str(struct hist_field *field, char *expr)
1480 if (field->flags & HIST_FIELD_FL_VAR_REF)
1483 strcat(expr, hist_field_name(field, 0));
1485 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
1486 const char *flags_str = get_hist_field_flags(field);
1490 strcat(expr, flags_str);
1495 static char *expr_str(struct hist_field *field, unsigned int level)
1502 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
1506 if (!field->operands[0]) {
1507 expr_field_str(field, expr);
1511 if (field->operator == FIELD_OP_UNARY_MINUS) {
1515 subexpr = expr_str(field->operands[0], ++level);
1520 strcat(expr, subexpr);
1528 expr_field_str(field->operands[0], expr);
1530 switch (field->operator) {
1531 case FIELD_OP_MINUS:
1542 expr_field_str(field->operands[1], expr);
1547 static int contains_operator(char *str)
1549 enum field_op_id field_op = FIELD_OP_NONE;
1552 op = strpbrk(str, "+-");
1554 return FIELD_OP_NONE;
1559 * Unfortunately, the modifier ".sym-offset"
1560 * can confuse things.
1562 if (op - str >= 4 && !strncmp(op - 4, ".sym-offset", 11))
1563 return FIELD_OP_NONE;
1566 field_op = FIELD_OP_UNARY_MINUS;
1568 field_op = FIELD_OP_MINUS;
1571 field_op = FIELD_OP_PLUS;
1580 static void get_hist_field(struct hist_field *hist_field)
1585 static void __destroy_hist_field(struct hist_field *hist_field)
1587 if (--hist_field->ref > 1)
1590 kfree(hist_field->var.name);
1591 kfree(hist_field->name);
1592 kfree(hist_field->type);
1594 kfree(hist_field->system);
1595 kfree(hist_field->event_name);
1600 static void destroy_hist_field(struct hist_field *hist_field,
1611 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
1612 return; /* var refs will be destroyed separately */
1614 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
1615 destroy_hist_field(hist_field->operands[i], level + 1);
1617 __destroy_hist_field(hist_field);
1620 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
1621 struct ftrace_event_field *field,
1622 unsigned long flags,
1625 struct hist_field *hist_field;
1627 if (field && is_function_field(field))
1630 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
1634 hist_field->ref = 1;
1636 hist_field->hist_data = hist_data;
1638 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
1639 goto out; /* caller will populate */
1641 if (flags & HIST_FIELD_FL_VAR_REF) {
1642 hist_field->fn = hist_field_var_ref;
1646 if (flags & HIST_FIELD_FL_HITCOUNT) {
1647 hist_field->fn = hist_field_counter;
1648 hist_field->size = sizeof(u64);
1649 hist_field->type = kstrdup("u64", GFP_KERNEL);
1650 if (!hist_field->type)
1655 if (flags & HIST_FIELD_FL_STACKTRACE) {
1656 hist_field->fn = hist_field_none;
1660 if (flags & HIST_FIELD_FL_LOG2) {
1661 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
1662 hist_field->fn = hist_field_log2;
1663 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
1664 hist_field->size = hist_field->operands[0]->size;
1665 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
1666 if (!hist_field->type)
1671 if (flags & HIST_FIELD_FL_TIMESTAMP) {
1672 hist_field->fn = hist_field_timestamp;
1673 hist_field->size = sizeof(u64);
1674 hist_field->type = kstrdup("u64", GFP_KERNEL);
1675 if (!hist_field->type)
1680 if (flags & HIST_FIELD_FL_CPU) {
1681 hist_field->fn = hist_field_cpu;
1682 hist_field->size = sizeof(int);
1683 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
1684 if (!hist_field->type)
1689 if (WARN_ON_ONCE(!field))
1692 if (is_string_field(field)) {
1693 flags |= HIST_FIELD_FL_STRING;
1695 hist_field->size = MAX_FILTER_STR_VAL;
1696 hist_field->type = kstrdup(field->type, GFP_KERNEL);
1697 if (!hist_field->type)
1700 if (field->filter_type == FILTER_STATIC_STRING)
1701 hist_field->fn = hist_field_string;
1702 else if (field->filter_type == FILTER_DYN_STRING)
1703 hist_field->fn = hist_field_dynstring;
1705 hist_field->fn = hist_field_pstring;
1707 hist_field->size = field->size;
1708 hist_field->is_signed = field->is_signed;
1709 hist_field->type = kstrdup(field->type, GFP_KERNEL);
1710 if (!hist_field->type)
1713 hist_field->fn = select_value_fn(field->size,
1715 if (!hist_field->fn) {
1716 destroy_hist_field(hist_field, 0);
1721 hist_field->field = field;
1722 hist_field->flags = flags;
1725 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
1726 if (!hist_field->var.name)
1732 destroy_hist_field(hist_field, 0);
1736 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
1740 for (i = 0; i < HIST_FIELDS_MAX; i++) {
1741 if (hist_data->fields[i]) {
1742 destroy_hist_field(hist_data->fields[i], 0);
1743 hist_data->fields[i] = NULL;
1747 for (i = 0; i < hist_data->n_var_refs; i++) {
1748 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
1749 __destroy_hist_field(hist_data->var_refs[i]);
1750 hist_data->var_refs[i] = NULL;
1754 static int init_var_ref(struct hist_field *ref_field,
1755 struct hist_field *var_field,
1756 char *system, char *event_name)
1760 ref_field->var.idx = var_field->var.idx;
1761 ref_field->var.hist_data = var_field->hist_data;
1762 ref_field->size = var_field->size;
1763 ref_field->is_signed = var_field->is_signed;
1764 ref_field->flags |= var_field->flags &
1765 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
1768 ref_field->system = kstrdup(system, GFP_KERNEL);
1769 if (!ref_field->system)
1774 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
1775 if (!ref_field->event_name) {
1781 if (var_field->var.name) {
1782 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
1783 if (!ref_field->name) {
1787 } else if (var_field->name) {
1788 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
1789 if (!ref_field->name) {
1795 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
1796 if (!ref_field->type) {
1803 kfree(ref_field->system);
1804 kfree(ref_field->event_name);
1805 kfree(ref_field->name);
1810 static int find_var_ref_idx(struct hist_trigger_data *hist_data,
1811 struct hist_field *var_field)
1813 struct hist_field *ref_field;
1816 for (i = 0; i < hist_data->n_var_refs; i++) {
1817 ref_field = hist_data->var_refs[i];
1818 if (ref_field->var.idx == var_field->var.idx &&
1819 ref_field->var.hist_data == var_field->hist_data)
1827 * create_var_ref - Create a variable reference and attach it to trigger
1828 * @hist_data: The trigger that will be referencing the variable
1829 * @var_field: The VAR field to create a reference to
1830 * @system: The optional system string
1831 * @event_name: The optional event_name string
1833 * Given a variable hist_field, create a VAR_REF hist_field that
1834 * represents a reference to it.
1836 * This function also adds the reference to the trigger that
1837 * now references the variable.
1839 * Return: The VAR_REF field if successful, NULL if not
1841 static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
1842 struct hist_field *var_field,
1843 char *system, char *event_name)
1845 unsigned long flags = HIST_FIELD_FL_VAR_REF;
1846 struct hist_field *ref_field;
1849 /* Check if the variable already exists */
1850 for (i = 0; i < hist_data->n_var_refs; i++) {
1851 ref_field = hist_data->var_refs[i];
1852 if (ref_field->var.idx == var_field->var.idx &&
1853 ref_field->var.hist_data == var_field->hist_data) {
1854 get_hist_field(ref_field);
1859 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
1861 if (init_var_ref(ref_field, var_field, system, event_name)) {
1862 destroy_hist_field(ref_field, 0);
1866 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
1867 ref_field->var_ref_idx = hist_data->n_var_refs++;
1873 static bool is_var_ref(char *var_name)
1875 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
1881 static char *field_name_from_var(struct hist_trigger_data *hist_data,
1887 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
1888 name = hist_data->attrs->var_defs.name[i];
1890 if (strcmp(var_name, name) == 0) {
1891 field = hist_data->attrs->var_defs.expr[i];
1892 if (contains_operator(field) || is_var_ref(field))
1901 static char *local_field_var_ref(struct hist_trigger_data *hist_data,
1902 char *system, char *event_name,
1905 struct trace_event_call *call;
1907 if (system && event_name) {
1908 call = hist_data->event_file->event_call;
1910 if (strcmp(system, call->class->system) != 0)
1913 if (strcmp(event_name, trace_event_name(call)) != 0)
1917 if (!!system != !!event_name)
1920 if (!is_var_ref(var_name))
1925 return field_name_from_var(hist_data, var_name);
1928 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
1929 char *system, char *event_name,
1932 struct hist_field *var_field = NULL, *ref_field = NULL;
1933 struct trace_array *tr = hist_data->event_file->tr;
1935 if (!is_var_ref(var_name))
1940 var_field = find_event_var(hist_data, system, event_name, var_name);
1942 ref_field = create_var_ref(hist_data, var_field,
1943 system, event_name);
1946 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
1951 static struct ftrace_event_field *
1952 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
1953 char *field_str, unsigned long *flags)
1955 struct ftrace_event_field *field = NULL;
1956 char *field_name, *modifier, *str;
1957 struct trace_array *tr = file->tr;
1959 modifier = str = kstrdup(field_str, GFP_KERNEL);
1961 return ERR_PTR(-ENOMEM);
1963 field_name = strsep(&modifier, ".");
1965 if (strcmp(modifier, "hex") == 0)
1966 *flags |= HIST_FIELD_FL_HEX;
1967 else if (strcmp(modifier, "sym") == 0)
1968 *flags |= HIST_FIELD_FL_SYM;
1969 else if (strcmp(modifier, "sym-offset") == 0)
1970 *flags |= HIST_FIELD_FL_SYM_OFFSET;
1971 else if ((strcmp(modifier, "execname") == 0) &&
1972 (strcmp(field_name, "common_pid") == 0))
1973 *flags |= HIST_FIELD_FL_EXECNAME;
1974 else if (strcmp(modifier, "syscall") == 0)
1975 *flags |= HIST_FIELD_FL_SYSCALL;
1976 else if (strcmp(modifier, "log2") == 0)
1977 *flags |= HIST_FIELD_FL_LOG2;
1978 else if (strcmp(modifier, "usecs") == 0)
1979 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
1981 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
1982 field = ERR_PTR(-EINVAL);
1987 if (strcmp(field_name, "common_timestamp") == 0) {
1988 *flags |= HIST_FIELD_FL_TIMESTAMP;
1989 hist_data->enable_timestamps = true;
1990 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
1991 hist_data->attrs->ts_in_usecs = true;
1992 } else if (strcmp(field_name, "cpu") == 0)
1993 *flags |= HIST_FIELD_FL_CPU;
1995 field = trace_find_event_field(file->event_call, field_name);
1996 if (!field || !field->size) {
1997 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
1998 field = ERR_PTR(-EINVAL);
2008 static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2009 struct hist_field *var_ref,
2012 struct hist_field *alias = NULL;
2013 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2015 alias = create_hist_field(hist_data, NULL, flags, var_name);
2019 alias->fn = var_ref->fn;
2020 alias->operands[0] = var_ref;
2022 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2023 destroy_hist_field(alias, 0);
2027 alias->var_ref_idx = var_ref->var_ref_idx;
2032 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2033 struct trace_event_file *file, char *str,
2034 unsigned long *flags, char *var_name)
2036 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
2037 struct ftrace_event_field *field = NULL;
2038 struct hist_field *hist_field = NULL;
2041 s = strchr(str, '.');
2043 s = strchr(++s, '.');
2045 ref_system = strsep(&str, ".");
2050 ref_event = strsep(&str, ".");
2059 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2061 hist_field = parse_var_ref(hist_data, ref_system,
2062 ref_event, ref_var);
2065 hist_field = create_alias(hist_data, hist_field, var_name);
2076 field = parse_field(hist_data, file, str, flags);
2077 if (IS_ERR(field)) {
2078 ret = PTR_ERR(field);
2082 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2090 return ERR_PTR(ret);
2093 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2094 struct trace_event_file *file,
2095 char *str, unsigned long flags,
2096 char *var_name, unsigned int level);
2098 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2099 struct trace_event_file *file,
2100 char *str, unsigned long flags,
2101 char *var_name, unsigned int level)
2103 struct hist_field *operand1, *expr = NULL;
2104 unsigned long operand_flags;
2108 /* we support only -(xxx) i.e. explicit parens required */
2111 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2116 str++; /* skip leading '-' */
2118 s = strchr(str, '(');
2126 s = strrchr(str, ')');
2130 ret = -EINVAL; /* no closing ')' */
2134 flags |= HIST_FIELD_FL_EXPR;
2135 expr = create_hist_field(hist_data, NULL, flags, var_name);
2142 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2143 if (IS_ERR(operand1)) {
2144 ret = PTR_ERR(operand1);
2148 expr->flags |= operand1->flags &
2149 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2150 expr->fn = hist_field_unary_minus;
2151 expr->operands[0] = operand1;
2152 expr->operator = FIELD_OP_UNARY_MINUS;
2153 expr->name = expr_str(expr, 0);
2154 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2162 destroy_hist_field(expr, 0);
2163 return ERR_PTR(ret);
2166 static int check_expr_operands(struct trace_array *tr,
2167 struct hist_field *operand1,
2168 struct hist_field *operand2)
2170 unsigned long operand1_flags = operand1->flags;
2171 unsigned long operand2_flags = operand2->flags;
2173 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2174 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2175 struct hist_field *var;
2177 var = find_var_field(operand1->var.hist_data, operand1->name);
2180 operand1_flags = var->flags;
2183 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2184 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2185 struct hist_field *var;
2187 var = find_var_field(operand2->var.hist_data, operand2->name);
2190 operand2_flags = var->flags;
2193 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
2194 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
2195 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
2202 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2203 struct trace_event_file *file,
2204 char *str, unsigned long flags,
2205 char *var_name, unsigned int level)
2207 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2208 unsigned long operand_flags;
2209 int field_op, ret = -EINVAL;
2210 char *sep, *operand1_str;
2213 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2214 return ERR_PTR(-EINVAL);
2217 field_op = contains_operator(str);
2219 if (field_op == FIELD_OP_NONE)
2220 return parse_atom(hist_data, file, str, &flags, var_name);
2222 if (field_op == FIELD_OP_UNARY_MINUS)
2223 return parse_unary(hist_data, file, str, flags, var_name, ++level);
2226 case FIELD_OP_MINUS:
2236 operand1_str = strsep(&str, sep);
2237 if (!operand1_str || !str)
2241 operand1 = parse_atom(hist_data, file, operand1_str,
2242 &operand_flags, NULL);
2243 if (IS_ERR(operand1)) {
2244 ret = PTR_ERR(operand1);
2249 /* rest of string could be another expression e.g. b+c in a+b+c */
2251 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2252 if (IS_ERR(operand2)) {
2253 ret = PTR_ERR(operand2);
2258 ret = check_expr_operands(file->tr, operand1, operand2);
2262 flags |= HIST_FIELD_FL_EXPR;
2264 flags |= operand1->flags &
2265 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2267 expr = create_hist_field(hist_data, NULL, flags, var_name);
2273 operand1->read_once = true;
2274 operand2->read_once = true;
2276 expr->operands[0] = operand1;
2277 expr->operands[1] = operand2;
2278 expr->operator = field_op;
2279 expr->name = expr_str(expr, 0);
2280 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2287 case FIELD_OP_MINUS:
2288 expr->fn = hist_field_minus;
2291 expr->fn = hist_field_plus;
2300 destroy_hist_field(operand1, 0);
2301 destroy_hist_field(operand2, 0);
2302 destroy_hist_field(expr, 0);
2304 return ERR_PTR(ret);
2307 static char *find_trigger_filter(struct hist_trigger_data *hist_data,
2308 struct trace_event_file *file)
2310 struct event_trigger_data *test;
2312 lockdep_assert_held(&event_mutex);
2314 list_for_each_entry(test, &file->triggers, list) {
2315 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2316 if (test->private_data == hist_data)
2317 return test->filter_str;
2324 static struct event_command trigger_hist_cmd;
2325 static int event_hist_trigger_func(struct event_command *cmd_ops,
2326 struct trace_event_file *file,
2327 char *glob, char *cmd, char *param);
2329 static bool compatible_keys(struct hist_trigger_data *target_hist_data,
2330 struct hist_trigger_data *hist_data,
2331 unsigned int n_keys)
2333 struct hist_field *target_hist_field, *hist_field;
2334 unsigned int n, i, j;
2336 if (hist_data->n_fields - hist_data->n_vals != n_keys)
2339 i = hist_data->n_vals;
2340 j = target_hist_data->n_vals;
2342 for (n = 0; n < n_keys; n++) {
2343 hist_field = hist_data->fields[i + n];
2344 target_hist_field = target_hist_data->fields[j + n];
2346 if (strcmp(hist_field->type, target_hist_field->type) != 0)
2348 if (hist_field->size != target_hist_field->size)
2350 if (hist_field->is_signed != target_hist_field->is_signed)
2357 static struct hist_trigger_data *
2358 find_compatible_hist(struct hist_trigger_data *target_hist_data,
2359 struct trace_event_file *file)
2361 struct hist_trigger_data *hist_data;
2362 struct event_trigger_data *test;
2363 unsigned int n_keys;
2365 lockdep_assert_held(&event_mutex);
2367 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
2369 list_for_each_entry(test, &file->triggers, list) {
2370 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2371 hist_data = test->private_data;
2373 if (compatible_keys(target_hist_data, hist_data, n_keys))
2381 static struct trace_event_file *event_file(struct trace_array *tr,
2382 char *system, char *event_name)
2384 struct trace_event_file *file;
2386 file = __find_event_file(tr, system, event_name);
2388 return ERR_PTR(-EINVAL);
2393 static struct hist_field *
2394 find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
2395 char *system, char *event_name, char *field_name)
2397 struct hist_field *event_var;
2398 char *synthetic_name;
2400 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2401 if (!synthetic_name)
2402 return ERR_PTR(-ENOMEM);
2404 strcpy(synthetic_name, "synthetic_");
2405 strcat(synthetic_name, field_name);
2407 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
2409 kfree(synthetic_name);
2415 * create_field_var_hist - Automatically create a histogram and var for a field
2416 * @target_hist_data: The target hist trigger
2417 * @subsys_name: Optional subsystem name
2418 * @event_name: Optional event name
2419 * @field_name: The name of the field (and the resulting variable)
2421 * Hist trigger actions fetch data from variables, not directly from
2422 * events. However, for convenience, users are allowed to directly
2423 * specify an event field in an action, which will be automatically
2424 * converted into a variable on their behalf.
2426 * If a user specifies a field on an event that isn't the event the
2427 * histogram currently being defined (the target event histogram), the
2428 * only way that can be accomplished is if a new hist trigger is
2429 * created and the field variable defined on that.
2431 * This function creates a new histogram compatible with the target
2432 * event (meaning a histogram with the same key as the target
2433 * histogram), and creates a variable for the specified field, but
2434 * with 'synthetic_' prepended to the variable name in order to avoid
2435 * collision with normal field variables.
2437 * Return: The variable created for the field.
2439 static struct hist_field *
2440 create_field_var_hist(struct hist_trigger_data *target_hist_data,
2441 char *subsys_name, char *event_name, char *field_name)
2443 struct trace_array *tr = target_hist_data->event_file->tr;
2444 struct hist_trigger_data *hist_data;
2445 unsigned int i, n, first = true;
2446 struct field_var_hist *var_hist;
2447 struct trace_event_file *file;
2448 struct hist_field *key_field;
2449 struct hist_field *event_var;
2454 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
2455 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
2456 return ERR_PTR(-EINVAL);
2459 file = event_file(tr, subsys_name, event_name);
2462 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
2463 ret = PTR_ERR(file);
2464 return ERR_PTR(ret);
2468 * Look for a histogram compatible with target. We'll use the
2469 * found histogram specification to create a new matching
2470 * histogram with our variable on it. target_hist_data is not
2471 * yet a registered histogram so we can't use that.
2473 hist_data = find_compatible_hist(target_hist_data, file);
2475 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
2476 return ERR_PTR(-EINVAL);
2479 /* See if a synthetic field variable has already been created */
2480 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2481 event_name, field_name);
2482 if (!IS_ERR_OR_NULL(event_var))
2485 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
2487 return ERR_PTR(-ENOMEM);
2489 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2492 return ERR_PTR(-ENOMEM);
2495 /* Use the same keys as the compatible histogram */
2496 strcat(cmd, "keys=");
2498 for_each_hist_key_field(i, hist_data) {
2499 key_field = hist_data->fields[i];
2502 strcat(cmd, key_field->field->name);
2506 /* Create the synthetic field variable specification */
2507 strcat(cmd, ":synthetic_");
2508 strcat(cmd, field_name);
2510 strcat(cmd, field_name);
2512 /* Use the same filter as the compatible histogram */
2513 saved_filter = find_trigger_filter(hist_data, file);
2515 strcat(cmd, " if ");
2516 strcat(cmd, saved_filter);
2519 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
2520 if (!var_hist->cmd) {
2523 return ERR_PTR(-ENOMEM);
2526 /* Save the compatible histogram information */
2527 var_hist->hist_data = hist_data;
2529 /* Create the new histogram with our variable */
2530 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
2534 kfree(var_hist->cmd);
2536 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
2537 return ERR_PTR(ret);
2542 /* If we can't find the variable, something went wrong */
2543 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2544 event_name, field_name);
2545 if (IS_ERR_OR_NULL(event_var)) {
2546 kfree(var_hist->cmd);
2548 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
2549 return ERR_PTR(-EINVAL);
2552 n = target_hist_data->n_field_var_hists;
2553 target_hist_data->field_var_hists[n] = var_hist;
2554 target_hist_data->n_field_var_hists++;
2559 static struct hist_field *
2560 find_target_event_var(struct hist_trigger_data *hist_data,
2561 char *subsys_name, char *event_name, char *var_name)
2563 struct trace_event_file *file = hist_data->event_file;
2564 struct hist_field *hist_field = NULL;
2567 struct trace_event_call *call;
2572 call = file->event_call;
2574 if (strcmp(subsys_name, call->class->system) != 0)
2577 if (strcmp(event_name, trace_event_name(call)) != 0)
2581 hist_field = find_var_field(hist_data, var_name);
2586 static inline void __update_field_vars(struct tracing_map_elt *elt,
2587 struct trace_buffer *buffer,
2588 struct ring_buffer_event *rbe,
2590 struct field_var **field_vars,
2591 unsigned int n_field_vars,
2592 unsigned int field_var_str_start)
2594 struct hist_elt_data *elt_data = elt->private_data;
2595 unsigned int i, j, var_idx;
2598 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
2599 struct field_var *field_var = field_vars[i];
2600 struct hist_field *var = field_var->var;
2601 struct hist_field *val = field_var->val;
2603 var_val = val->fn(val, elt, buffer, rbe, rec);
2604 var_idx = var->var.idx;
2606 if (val->flags & HIST_FIELD_FL_STRING) {
2607 char *str = elt_data->field_var_str[j++];
2608 char *val_str = (char *)(uintptr_t)var_val;
2610 strscpy(str, val_str, STR_VAR_LEN_MAX);
2611 var_val = (u64)(uintptr_t)str;
2613 tracing_map_set_var(elt, var_idx, var_val);
2617 static void update_field_vars(struct hist_trigger_data *hist_data,
2618 struct tracing_map_elt *elt,
2619 struct trace_buffer *buffer,
2620 struct ring_buffer_event *rbe,
2623 __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars,
2624 hist_data->n_field_vars, 0);
2627 static void save_track_data_vars(struct hist_trigger_data *hist_data,
2628 struct tracing_map_elt *elt,
2629 struct trace_buffer *buffer, void *rec,
2630 struct ring_buffer_event *rbe, void *key,
2631 struct action_data *data, u64 *var_ref_vals)
2633 __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars,
2634 hist_data->n_save_vars, hist_data->n_field_var_str);
2637 static struct hist_field *create_var(struct hist_trigger_data *hist_data,
2638 struct trace_event_file *file,
2639 char *name, int size, const char *type)
2641 struct hist_field *var;
2644 if (find_var(hist_data, file, name) && !hist_data->remove) {
2645 var = ERR_PTR(-EINVAL);
2649 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2651 var = ERR_PTR(-ENOMEM);
2655 idx = tracing_map_add_var(hist_data->map);
2658 var = ERR_PTR(-EINVAL);
2663 var->flags = HIST_FIELD_FL_VAR;
2665 var->var.hist_data = var->hist_data = hist_data;
2667 var->var.name = kstrdup(name, GFP_KERNEL);
2668 var->type = kstrdup(type, GFP_KERNEL);
2669 if (!var->var.name || !var->type) {
2670 kfree(var->var.name);
2673 var = ERR_PTR(-ENOMEM);
2679 static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
2680 struct trace_event_file *file,
2683 struct hist_field *val = NULL, *var = NULL;
2684 unsigned long flags = HIST_FIELD_FL_VAR;
2685 struct trace_array *tr = file->tr;
2686 struct field_var *field_var;
2689 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
2690 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
2695 val = parse_atom(hist_data, file, field_name, &flags, NULL);
2697 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
2702 var = create_var(hist_data, file, field_name, val->size, val->type);
2704 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
2710 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
2718 field_var->var = var;
2719 field_var->val = val;
2723 field_var = ERR_PTR(ret);
2728 * create_target_field_var - Automatically create a variable for a field
2729 * @target_hist_data: The target hist trigger
2730 * @subsys_name: Optional subsystem name
2731 * @event_name: Optional event name
2732 * @var_name: The name of the field (and the resulting variable)
2734 * Hist trigger actions fetch data from variables, not directly from
2735 * events. However, for convenience, users are allowed to directly
2736 * specify an event field in an action, which will be automatically
2737 * converted into a variable on their behalf.
2739 * This function creates a field variable with the name var_name on
2740 * the hist trigger currently being defined on the target event. If
2741 * subsys_name and event_name are specified, this function simply
2742 * verifies that they do in fact match the target event subsystem and
2745 * Return: The variable created for the field.
2747 static struct field_var *
2748 create_target_field_var(struct hist_trigger_data *target_hist_data,
2749 char *subsys_name, char *event_name, char *var_name)
2751 struct trace_event_file *file = target_hist_data->event_file;
2754 struct trace_event_call *call;
2759 call = file->event_call;
2761 if (strcmp(subsys_name, call->class->system) != 0)
2764 if (strcmp(event_name, trace_event_name(call)) != 0)
2768 return create_field_var(target_hist_data, file, var_name);
2771 static bool check_track_val_max(u64 track_val, u64 var_val)
2773 if (var_val <= track_val)
2779 static bool check_track_val_changed(u64 track_val, u64 var_val)
2781 if (var_val == track_val)
2787 static u64 get_track_val(struct hist_trigger_data *hist_data,
2788 struct tracing_map_elt *elt,
2789 struct action_data *data)
2791 unsigned int track_var_idx = data->track_data.track_var->var.idx;
2794 track_val = tracing_map_read_var(elt, track_var_idx);
2799 static void save_track_val(struct hist_trigger_data *hist_data,
2800 struct tracing_map_elt *elt,
2801 struct action_data *data, u64 var_val)
2803 unsigned int track_var_idx = data->track_data.track_var->var.idx;
2805 tracing_map_set_var(elt, track_var_idx, var_val);
2808 static void save_track_data(struct hist_trigger_data *hist_data,
2809 struct tracing_map_elt *elt,
2810 struct trace_buffer *buffer, void *rec,
2811 struct ring_buffer_event *rbe, void *key,
2812 struct action_data *data, u64 *var_ref_vals)
2814 if (data->track_data.save_data)
2815 data->track_data.save_data(hist_data, elt, buffer, rec, rbe,
2816 key, data, var_ref_vals);
2819 static bool check_track_val(struct tracing_map_elt *elt,
2820 struct action_data *data,
2823 struct hist_trigger_data *hist_data;
2826 hist_data = data->track_data.track_var->hist_data;
2827 track_val = get_track_val(hist_data, elt, data);
2829 return data->track_data.check_val(track_val, var_val);
2832 #ifdef CONFIG_TRACER_SNAPSHOT
2833 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
2835 /* called with tr->max_lock held */
2836 struct track_data *track_data = tr->cond_snapshot->cond_data;
2837 struct hist_elt_data *elt_data, *track_elt_data;
2838 struct snapshot_context *context = cond_data;
2839 struct action_data *action;
2845 action = track_data->action_data;
2847 track_val = get_track_val(track_data->hist_data, context->elt,
2848 track_data->action_data);
2850 if (!action->track_data.check_val(track_data->track_val, track_val))
2853 track_data->track_val = track_val;
2854 memcpy(track_data->key, context->key, track_data->key_len);
2856 elt_data = context->elt->private_data;
2857 track_elt_data = track_data->elt.private_data;
2859 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
2861 track_data->updated = true;
2866 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
2867 struct tracing_map_elt *elt,
2868 struct trace_buffer *buffer, void *rec,
2869 struct ring_buffer_event *rbe, void *key,
2870 struct action_data *data,
2873 struct trace_event_file *file = hist_data->event_file;
2874 struct snapshot_context context;
2879 tracing_snapshot_cond(file->tr, &context);
2882 static void hist_trigger_print_key(struct seq_file *m,
2883 struct hist_trigger_data *hist_data,
2885 struct tracing_map_elt *elt);
2887 static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
2891 if (!hist_data->n_actions)
2894 for (i = 0; i < hist_data->n_actions; i++) {
2895 struct action_data *data = hist_data->actions[i];
2897 if (data->action == ACTION_SNAPSHOT)
2904 static void track_data_snapshot_print(struct seq_file *m,
2905 struct hist_trigger_data *hist_data)
2907 struct trace_event_file *file = hist_data->event_file;
2908 struct track_data *track_data;
2909 struct action_data *action;
2911 track_data = tracing_cond_snapshot_data(file->tr);
2915 if (!track_data->updated)
2918 action = snapshot_action(hist_data);
2922 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
2923 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
2924 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
2925 action->track_data.var_str, track_data->track_val);
2927 seq_puts(m, "\ttriggered by event with key: ");
2928 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
2932 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
2936 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
2937 struct tracing_map_elt *elt,
2938 struct trace_buffer *buffer, void *rec,
2939 struct ring_buffer_event *rbe, void *key,
2940 struct action_data *data,
2941 u64 *var_ref_vals) {}
2942 static void track_data_snapshot_print(struct seq_file *m,
2943 struct hist_trigger_data *hist_data) {}
2944 #endif /* CONFIG_TRACER_SNAPSHOT */
2946 static void track_data_print(struct seq_file *m,
2947 struct hist_trigger_data *hist_data,
2948 struct tracing_map_elt *elt,
2949 struct action_data *data)
2951 u64 track_val = get_track_val(hist_data, elt, data);
2952 unsigned int i, save_var_idx;
2954 if (data->handler == HANDLER_ONMAX)
2955 seq_printf(m, "\n\tmax: %10llu", track_val);
2956 else if (data->handler == HANDLER_ONCHANGE)
2957 seq_printf(m, "\n\tchanged: %10llu", track_val);
2959 if (data->action == ACTION_SNAPSHOT)
2962 for (i = 0; i < hist_data->n_save_vars; i++) {
2963 struct hist_field *save_val = hist_data->save_vars[i]->val;
2964 struct hist_field *save_var = hist_data->save_vars[i]->var;
2967 save_var_idx = save_var->var.idx;
2969 val = tracing_map_read_var(elt, save_var_idx);
2971 if (save_val->flags & HIST_FIELD_FL_STRING) {
2972 seq_printf(m, " %s: %-32s", save_var->var.name,
2973 (char *)(uintptr_t)(val));
2975 seq_printf(m, " %s: %10llu", save_var->var.name, val);
2979 static void ontrack_action(struct hist_trigger_data *hist_data,
2980 struct tracing_map_elt *elt,
2981 struct trace_buffer *buffer, void *rec,
2982 struct ring_buffer_event *rbe, void *key,
2983 struct action_data *data, u64 *var_ref_vals)
2985 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
2987 if (check_track_val(elt, data, var_val)) {
2988 save_track_val(hist_data, elt, data, var_val);
2989 save_track_data(hist_data, elt, buffer, rec, rbe,
2990 key, data, var_ref_vals);
2994 static void action_data_destroy(struct action_data *data)
2998 lockdep_assert_held(&event_mutex);
3000 kfree(data->action_name);
3002 for (i = 0; i < data->n_params; i++)
3003 kfree(data->params[i]);
3005 if (data->synth_event)
3006 data->synth_event->ref--;
3008 kfree(data->synth_event_name);
3013 static void track_data_destroy(struct hist_trigger_data *hist_data,
3014 struct action_data *data)
3016 struct trace_event_file *file = hist_data->event_file;
3018 destroy_hist_field(data->track_data.track_var, 0);
3020 if (data->action == ACTION_SNAPSHOT) {
3021 struct track_data *track_data;
3023 track_data = tracing_cond_snapshot_data(file->tr);
3024 if (track_data && track_data->hist_data == hist_data) {
3025 tracing_snapshot_cond_disable(file->tr);
3026 track_data_free(track_data);
3030 kfree(data->track_data.var_str);
3032 action_data_destroy(data);
3035 static int action_create(struct hist_trigger_data *hist_data,
3036 struct action_data *data);
3038 static int track_data_create(struct hist_trigger_data *hist_data,
3039 struct action_data *data)
3041 struct hist_field *var_field, *ref_field, *track_var = NULL;
3042 struct trace_event_file *file = hist_data->event_file;
3043 struct trace_array *tr = file->tr;
3044 char *track_data_var_str;
3047 track_data_var_str = data->track_data.var_str;
3048 if (track_data_var_str[0] != '$') {
3049 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
3052 track_data_var_str++;
3054 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
3056 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
3060 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
3064 data->track_data.var_ref = ref_field;
3066 if (data->handler == HANDLER_ONMAX)
3067 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3068 if (IS_ERR(track_var)) {
3069 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3070 ret = PTR_ERR(track_var);
3074 if (data->handler == HANDLER_ONCHANGE)
3075 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3076 if (IS_ERR(track_var)) {
3077 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3078 ret = PTR_ERR(track_var);
3081 data->track_data.track_var = track_var;
3083 ret = action_create(hist_data, data);
3088 static int parse_action_params(struct trace_array *tr, char *params,
3089 struct action_data *data)
3091 char *param, *saved_param;
3092 bool first_param = true;
3096 if (data->n_params >= SYNTH_FIELDS_MAX) {
3097 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
3101 param = strsep(¶ms, ",");
3103 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
3108 param = strstrip(param);
3109 if (strlen(param) < 2) {
3110 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
3115 saved_param = kstrdup(param, GFP_KERNEL);
3121 if (first_param && data->use_trace_keyword) {
3122 data->synth_event_name = saved_param;
3123 first_param = false;
3126 first_param = false;
3128 data->params[data->n_params++] = saved_param;
3134 static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
3135 enum handler_id handler)
3142 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3147 action_name = strsep(&str, "(");
3148 if (!action_name || !str) {
3149 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3154 if (str_has_prefix(action_name, "save")) {
3155 char *params = strsep(&str, ")");
3158 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
3163 ret = parse_action_params(tr, params, data);
3167 if (handler == HANDLER_ONMAX)
3168 data->track_data.check_val = check_track_val_max;
3169 else if (handler == HANDLER_ONCHANGE)
3170 data->track_data.check_val = check_track_val_changed;
3172 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3177 data->track_data.save_data = save_track_data_vars;
3178 data->fn = ontrack_action;
3179 data->action = ACTION_SAVE;
3180 } else if (str_has_prefix(action_name, "snapshot")) {
3181 char *params = strsep(&str, ")");
3184 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
3189 if (handler == HANDLER_ONMAX)
3190 data->track_data.check_val = check_track_val_max;
3191 else if (handler == HANDLER_ONCHANGE)
3192 data->track_data.check_val = check_track_val_changed;
3194 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3199 data->track_data.save_data = save_track_data_snapshot;
3200 data->fn = ontrack_action;
3201 data->action = ACTION_SNAPSHOT;
3203 char *params = strsep(&str, ")");
3205 if (str_has_prefix(action_name, "trace"))
3206 data->use_trace_keyword = true;
3209 ret = parse_action_params(tr, params, data);
3214 if (handler == HANDLER_ONMAX)
3215 data->track_data.check_val = check_track_val_max;
3216 else if (handler == HANDLER_ONCHANGE)
3217 data->track_data.check_val = check_track_val_changed;
3219 if (handler != HANDLER_ONMATCH) {
3220 data->track_data.save_data = action_trace;
3221 data->fn = ontrack_action;
3223 data->fn = action_trace;
3225 data->action = ACTION_TRACE;
3228 data->action_name = kstrdup(action_name, GFP_KERNEL);
3229 if (!data->action_name) {
3234 data->handler = handler;
3239 static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
3240 char *str, enum handler_id handler)
3242 struct action_data *data;
3246 data = kzalloc(sizeof(*data), GFP_KERNEL);
3248 return ERR_PTR(-ENOMEM);
3250 var_str = strsep(&str, ")");
3251 if (!var_str || !str) {
3256 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
3257 if (!data->track_data.var_str) {
3262 ret = action_parse(hist_data->event_file->tr, str, data, handler);
3268 track_data_destroy(hist_data, data);
3269 data = ERR_PTR(ret);
3273 static void onmatch_destroy(struct action_data *data)
3275 kfree(data->match_data.event);
3276 kfree(data->match_data.event_system);
3278 action_data_destroy(data);
3281 static void destroy_field_var(struct field_var *field_var)
3286 destroy_hist_field(field_var->var, 0);
3287 destroy_hist_field(field_var->val, 0);
3292 static void destroy_field_vars(struct hist_trigger_data *hist_data)
3296 for (i = 0; i < hist_data->n_field_vars; i++)
3297 destroy_field_var(hist_data->field_vars[i]);
3299 for (i = 0; i < hist_data->n_save_vars; i++)
3300 destroy_field_var(hist_data->save_vars[i]);
3303 static void save_field_var(struct hist_trigger_data *hist_data,
3304 struct field_var *field_var)
3306 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3308 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3309 hist_data->n_field_var_str++;
3313 static int check_synth_field(struct synth_event *event,
3314 struct hist_field *hist_field,
3315 unsigned int field_pos)
3317 struct synth_field *field;
3319 if (field_pos >= event->n_fields)
3322 field = event->fields[field_pos];
3325 * A dynamic string synth field can accept static or
3326 * dynamic. A static string synth field can only accept a
3327 * same-sized static string, which is checked for later.
3329 if (strstr(hist_field->type, "char[") && field->is_string
3330 && field->is_dynamic)
3333 if (strcmp(field->type, hist_field->type) != 0) {
3334 if (field->size != hist_field->size ||
3335 field->is_signed != hist_field->is_signed)
3342 static struct hist_field *
3343 trace_action_find_var(struct hist_trigger_data *hist_data,
3344 struct action_data *data,
3345 char *system, char *event, char *var)
3347 struct trace_array *tr = hist_data->event_file->tr;
3348 struct hist_field *hist_field;
3350 var++; /* skip '$' */
3352 hist_field = find_target_event_var(hist_data, system, event, var);
3354 if (!system && data->handler == HANDLER_ONMATCH) {
3355 system = data->match_data.event_system;
3356 event = data->match_data.event;
3359 hist_field = find_event_var(hist_data, system, event, var);
3363 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
3368 static struct hist_field *
3369 trace_action_create_field_var(struct hist_trigger_data *hist_data,
3370 struct action_data *data, char *system,
3371 char *event, char *var)
3373 struct hist_field *hist_field = NULL;
3374 struct field_var *field_var;
3377 * First try to create a field var on the target event (the
3378 * currently being defined). This will create a variable for
3379 * unqualified fields on the target event, or if qualified,
3380 * target fields that have qualified names matching the target.
3382 field_var = create_target_field_var(hist_data, system, event, var);
3384 if (field_var && !IS_ERR(field_var)) {
3385 save_field_var(hist_data, field_var);
3386 hist_field = field_var->var;
3390 * If no explicit system.event is specified, default to
3391 * looking for fields on the onmatch(system.event.xxx)
3394 if (!system && data->handler == HANDLER_ONMATCH) {
3395 system = data->match_data.event_system;
3396 event = data->match_data.event;
3400 * At this point, we're looking at a field on another
3401 * event. Because we can't modify a hist trigger on
3402 * another event to add a variable for a field, we need
3403 * to create a new trigger on that event and create the
3404 * variable at the same time.
3406 hist_field = create_field_var_hist(hist_data, system, event, var);
3407 if (IS_ERR(hist_field))
3413 destroy_field_var(field_var);
3418 static int trace_action_create(struct hist_trigger_data *hist_data,
3419 struct action_data *data)
3421 struct trace_array *tr = hist_data->event_file->tr;
3422 char *event_name, *param, *system = NULL;
3423 struct hist_field *hist_field, *var_ref;
3425 unsigned int field_pos = 0;
3426 struct synth_event *event;
3427 char *synth_event_name;
3428 int var_ref_idx, ret = 0;
3430 lockdep_assert_held(&event_mutex);
3432 if (data->use_trace_keyword)
3433 synth_event_name = data->synth_event_name;
3435 synth_event_name = data->action_name;
3437 event = find_synth_event(synth_event_name);
3439 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
3445 for (i = 0; i < data->n_params; i++) {
3448 p = param = kstrdup(data->params[i], GFP_KERNEL);
3454 system = strsep(¶m, ".");
3456 param = (char *)system;
3457 system = event_name = NULL;
3459 event_name = strsep(¶m, ".");
3467 if (param[0] == '$')
3468 hist_field = trace_action_find_var(hist_data, data,
3472 hist_field = trace_action_create_field_var(hist_data,
3484 if (check_synth_field(event, hist_field, field_pos) == 0) {
3485 var_ref = create_var_ref(hist_data, hist_field,
3486 system, event_name);
3493 var_ref_idx = find_var_ref_idx(hist_data, var_ref);
3494 if (WARN_ON(var_ref_idx < 0)) {
3499 data->var_ref_idx[i] = var_ref_idx;
3506 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
3512 if (field_pos != event->n_fields) {
3513 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
3518 data->synth_event = event;
3527 static int action_create(struct hist_trigger_data *hist_data,
3528 struct action_data *data)
3530 struct trace_event_file *file = hist_data->event_file;
3531 struct trace_array *tr = file->tr;
3532 struct track_data *track_data;
3533 struct field_var *field_var;
3538 if (data->action == ACTION_TRACE)
3539 return trace_action_create(hist_data, data);
3541 if (data->action == ACTION_SNAPSHOT) {
3542 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
3543 if (IS_ERR(track_data)) {
3544 ret = PTR_ERR(track_data);
3548 ret = tracing_snapshot_cond_enable(file->tr, track_data,
3549 cond_snapshot_update);
3551 track_data_free(track_data);
3556 if (data->action == ACTION_SAVE) {
3557 if (hist_data->n_save_vars) {
3559 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
3563 for (i = 0; i < data->n_params; i++) {
3564 param = kstrdup(data->params[i], GFP_KERNEL);
3570 field_var = create_target_field_var(hist_data, NULL, NULL, param);
3571 if (IS_ERR(field_var)) {
3572 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
3574 ret = PTR_ERR(field_var);
3579 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
3580 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3581 hist_data->n_save_var_str++;
3589 static int onmatch_create(struct hist_trigger_data *hist_data,
3590 struct action_data *data)
3592 return action_create(hist_data, data);
3595 static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
3597 char *match_event, *match_event_system;
3598 struct action_data *data;
3601 data = kzalloc(sizeof(*data), GFP_KERNEL);
3603 return ERR_PTR(-ENOMEM);
3605 match_event = strsep(&str, ")");
3606 if (!match_event || !str) {
3607 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
3611 match_event_system = strsep(&match_event, ".");
3613 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
3617 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
3618 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
3622 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
3623 if (!data->match_data.event) {
3628 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
3629 if (!data->match_data.event_system) {
3634 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
3640 onmatch_destroy(data);
3641 data = ERR_PTR(ret);
3645 static int create_hitcount_val(struct hist_trigger_data *hist_data)
3647 hist_data->fields[HITCOUNT_IDX] =
3648 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
3649 if (!hist_data->fields[HITCOUNT_IDX])
3652 hist_data->n_vals++;
3653 hist_data->n_fields++;
3655 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
3661 static int __create_val_field(struct hist_trigger_data *hist_data,
3662 unsigned int val_idx,
3663 struct trace_event_file *file,
3664 char *var_name, char *field_str,
3665 unsigned long flags)
3667 struct hist_field *hist_field;
3670 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
3671 if (IS_ERR(hist_field)) {
3672 ret = PTR_ERR(hist_field);
3676 hist_data->fields[val_idx] = hist_field;
3678 ++hist_data->n_vals;
3679 ++hist_data->n_fields;
3681 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3687 static int create_val_field(struct hist_trigger_data *hist_data,
3688 unsigned int val_idx,
3689 struct trace_event_file *file,
3692 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
3695 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
3698 static int create_var_field(struct hist_trigger_data *hist_data,
3699 unsigned int val_idx,
3700 struct trace_event_file *file,
3701 char *var_name, char *expr_str)
3703 struct trace_array *tr = hist_data->event_file->tr;
3704 unsigned long flags = 0;
3707 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3710 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
3711 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
3715 flags |= HIST_FIELD_FL_VAR;
3716 hist_data->n_vars++;
3717 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
3720 ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
3722 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
3723 hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
3728 static int create_val_fields(struct hist_trigger_data *hist_data,
3729 struct trace_event_file *file)
3731 char *fields_str, *field_str;
3732 unsigned int i, j = 1;
3735 ret = create_hitcount_val(hist_data);
3739 fields_str = hist_data->attrs->vals_str;
3743 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
3744 j < TRACING_MAP_VALS_MAX; i++) {
3745 field_str = strsep(&fields_str, ",");
3749 if (strcmp(field_str, "hitcount") == 0)
3752 ret = create_val_field(hist_data, j++, file, field_str);
3757 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
3763 static int create_key_field(struct hist_trigger_data *hist_data,
3764 unsigned int key_idx,
3765 unsigned int key_offset,
3766 struct trace_event_file *file,
3769 struct trace_array *tr = hist_data->event_file->tr;
3770 struct hist_field *hist_field = NULL;
3771 unsigned long flags = 0;
3772 unsigned int key_size;
3775 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
3778 flags |= HIST_FIELD_FL_KEY;
3780 if (strcmp(field_str, "stacktrace") == 0) {
3781 flags |= HIST_FIELD_FL_STACKTRACE;
3782 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
3783 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
3785 hist_field = parse_expr(hist_data, file, field_str, flags,
3787 if (IS_ERR(hist_field)) {
3788 ret = PTR_ERR(hist_field);
3792 if (field_has_hist_vars(hist_field, 0)) {
3793 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
3794 destroy_hist_field(hist_field, 0);
3799 key_size = hist_field->size;
3802 hist_data->fields[key_idx] = hist_field;
3804 key_size = ALIGN(key_size, sizeof(u64));
3805 hist_data->fields[key_idx]->size = key_size;
3806 hist_data->fields[key_idx]->offset = key_offset;
3808 hist_data->key_size += key_size;
3810 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
3815 hist_data->n_keys++;
3816 hist_data->n_fields++;
3818 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
3826 static int create_key_fields(struct hist_trigger_data *hist_data,
3827 struct trace_event_file *file)
3829 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
3830 char *fields_str, *field_str;
3833 fields_str = hist_data->attrs->keys_str;
3837 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
3838 field_str = strsep(&fields_str, ",");
3841 ret = create_key_field(hist_data, i, key_offset,
3856 static int create_var_fields(struct hist_trigger_data *hist_data,
3857 struct trace_event_file *file)
3859 unsigned int i, j = hist_data->n_vals;
3862 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
3864 for (i = 0; i < n_vars; i++) {
3865 char *var_name = hist_data->attrs->var_defs.name[i];
3866 char *expr = hist_data->attrs->var_defs.expr[i];
3868 ret = create_var_field(hist_data, j++, file, var_name, expr);
3876 static void free_var_defs(struct hist_trigger_data *hist_data)
3880 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
3881 kfree(hist_data->attrs->var_defs.name[i]);
3882 kfree(hist_data->attrs->var_defs.expr[i]);
3885 hist_data->attrs->var_defs.n_vars = 0;
3888 static int parse_var_defs(struct hist_trigger_data *hist_data)
3890 struct trace_array *tr = hist_data->event_file->tr;
3891 char *s, *str, *var_name, *field_str;
3892 unsigned int i, j, n_vars = 0;
3895 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
3896 str = hist_data->attrs->assignment_str[i];
3897 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
3898 field_str = strsep(&str, ",");
3902 var_name = strsep(&field_str, "=");
3903 if (!var_name || !field_str) {
3904 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
3910 if (n_vars == TRACING_MAP_VARS_MAX) {
3911 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
3916 s = kstrdup(var_name, GFP_KERNEL);
3921 hist_data->attrs->var_defs.name[n_vars] = s;
3923 s = kstrdup(field_str, GFP_KERNEL);
3928 hist_data->attrs->var_defs.expr[n_vars++] = s;
3930 hist_data->attrs->var_defs.n_vars = n_vars;
3936 free_var_defs(hist_data);
3941 static int create_hist_fields(struct hist_trigger_data *hist_data,
3942 struct trace_event_file *file)
3946 ret = parse_var_defs(hist_data);
3950 ret = create_val_fields(hist_data, file);
3954 ret = create_var_fields(hist_data, file);
3958 ret = create_key_fields(hist_data, file);
3962 free_var_defs(hist_data);
3967 static int is_descending(struct trace_array *tr, const char *str)
3972 if (strcmp(str, "descending") == 0)
3975 if (strcmp(str, "ascending") == 0)
3978 hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str));
3983 static int create_sort_keys(struct hist_trigger_data *hist_data)
3985 struct trace_array *tr = hist_data->event_file->tr;
3986 char *fields_str = hist_data->attrs->sort_key_str;
3987 struct tracing_map_sort_key *sort_key;
3988 int descending, ret = 0;
3989 unsigned int i, j, k;
3991 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
3996 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
3997 struct hist_field *hist_field;
3998 char *field_str, *field_name;
3999 const char *test_name;
4001 sort_key = &hist_data->sort_keys[i];
4003 field_str = strsep(&fields_str, ",");
4009 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4013 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4014 hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort="));
4019 field_name = strsep(&field_str, ".");
4020 if (!field_name || !*field_name) {
4022 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4026 if (strcmp(field_name, "hitcount") == 0) {
4027 descending = is_descending(tr, field_str);
4028 if (descending < 0) {
4032 sort_key->descending = descending;
4036 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4039 hist_field = hist_data->fields[j];
4040 if (hist_field->flags & HIST_FIELD_FL_VAR)
4045 test_name = hist_field_name(hist_field, 0);
4047 if (strcmp(field_name, test_name) == 0) {
4048 sort_key->field_idx = idx;
4049 descending = is_descending(tr, field_str);
4050 if (descending < 0) {
4054 sort_key->descending = descending;
4058 if (j == hist_data->n_fields) {
4060 hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name));
4065 hist_data->n_sort_keys = i;
4070 static void destroy_actions(struct hist_trigger_data *hist_data)
4074 for (i = 0; i < hist_data->n_actions; i++) {
4075 struct action_data *data = hist_data->actions[i];
4077 if (data->handler == HANDLER_ONMATCH)
4078 onmatch_destroy(data);
4079 else if (data->handler == HANDLER_ONMAX ||
4080 data->handler == HANDLER_ONCHANGE)
4081 track_data_destroy(hist_data, data);
4087 static int parse_actions(struct hist_trigger_data *hist_data)
4089 struct trace_array *tr = hist_data->event_file->tr;
4090 struct action_data *data;
4096 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4097 str = hist_data->attrs->action_str[i];
4099 if ((len = str_has_prefix(str, "onmatch("))) {
4100 char *action_str = str + len;
4102 data = onmatch_parse(tr, action_str);
4104 ret = PTR_ERR(data);
4107 } else if ((len = str_has_prefix(str, "onmax("))) {
4108 char *action_str = str + len;
4110 data = track_data_parse(hist_data, action_str,
4113 ret = PTR_ERR(data);
4116 } else if ((len = str_has_prefix(str, "onchange("))) {
4117 char *action_str = str + len;
4119 data = track_data_parse(hist_data, action_str,
4122 ret = PTR_ERR(data);
4130 hist_data->actions[hist_data->n_actions++] = data;
4136 static int create_actions(struct hist_trigger_data *hist_data)
4138 struct action_data *data;
4142 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4143 data = hist_data->actions[i];
4145 if (data->handler == HANDLER_ONMATCH) {
4146 ret = onmatch_create(hist_data, data);
4149 } else if (data->handler == HANDLER_ONMAX ||
4150 data->handler == HANDLER_ONCHANGE) {
4151 ret = track_data_create(hist_data, data);
4163 static void print_actions(struct seq_file *m,
4164 struct hist_trigger_data *hist_data,
4165 struct tracing_map_elt *elt)
4169 for (i = 0; i < hist_data->n_actions; i++) {
4170 struct action_data *data = hist_data->actions[i];
4172 if (data->action == ACTION_SNAPSHOT)
4175 if (data->handler == HANDLER_ONMAX ||
4176 data->handler == HANDLER_ONCHANGE)
4177 track_data_print(m, hist_data, elt, data);
4181 static void print_action_spec(struct seq_file *m,
4182 struct hist_trigger_data *hist_data,
4183 struct action_data *data)
4187 if (data->action == ACTION_SAVE) {
4188 for (i = 0; i < hist_data->n_save_vars; i++) {
4189 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4190 if (i < hist_data->n_save_vars - 1)
4193 } else if (data->action == ACTION_TRACE) {
4194 if (data->use_trace_keyword)
4195 seq_printf(m, "%s", data->synth_event_name);
4196 for (i = 0; i < data->n_params; i++) {
4197 if (i || data->use_trace_keyword)
4199 seq_printf(m, "%s", data->params[i]);
4204 static void print_track_data_spec(struct seq_file *m,
4205 struct hist_trigger_data *hist_data,
4206 struct action_data *data)
4208 if (data->handler == HANDLER_ONMAX)
4209 seq_puts(m, ":onmax(");
4210 else if (data->handler == HANDLER_ONCHANGE)
4211 seq_puts(m, ":onchange(");
4212 seq_printf(m, "%s", data->track_data.var_str);
4213 seq_printf(m, ").%s(", data->action_name);
4215 print_action_spec(m, hist_data, data);
4220 static void print_onmatch_spec(struct seq_file *m,
4221 struct hist_trigger_data *hist_data,
4222 struct action_data *data)
4224 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4225 data->match_data.event);
4227 seq_printf(m, "%s(", data->action_name);
4229 print_action_spec(m, hist_data, data);
4234 static bool actions_match(struct hist_trigger_data *hist_data,
4235 struct hist_trigger_data *hist_data_test)
4239 if (hist_data->n_actions != hist_data_test->n_actions)
4242 for (i = 0; i < hist_data->n_actions; i++) {
4243 struct action_data *data = hist_data->actions[i];
4244 struct action_data *data_test = hist_data_test->actions[i];
4245 char *action_name, *action_name_test;
4247 if (data->handler != data_test->handler)
4249 if (data->action != data_test->action)
4252 if (data->n_params != data_test->n_params)
4255 for (j = 0; j < data->n_params; j++) {
4256 if (strcmp(data->params[j], data_test->params[j]) != 0)
4260 if (data->use_trace_keyword)
4261 action_name = data->synth_event_name;
4263 action_name = data->action_name;
4265 if (data_test->use_trace_keyword)
4266 action_name_test = data_test->synth_event_name;
4268 action_name_test = data_test->action_name;
4270 if (strcmp(action_name, action_name_test) != 0)
4273 if (data->handler == HANDLER_ONMATCH) {
4274 if (strcmp(data->match_data.event_system,
4275 data_test->match_data.event_system) != 0)
4277 if (strcmp(data->match_data.event,
4278 data_test->match_data.event) != 0)
4280 } else if (data->handler == HANDLER_ONMAX ||
4281 data->handler == HANDLER_ONCHANGE) {
4282 if (strcmp(data->track_data.var_str,
4283 data_test->track_data.var_str) != 0)
4292 static void print_actions_spec(struct seq_file *m,
4293 struct hist_trigger_data *hist_data)
4297 for (i = 0; i < hist_data->n_actions; i++) {
4298 struct action_data *data = hist_data->actions[i];
4300 if (data->handler == HANDLER_ONMATCH)
4301 print_onmatch_spec(m, hist_data, data);
4302 else if (data->handler == HANDLER_ONMAX ||
4303 data->handler == HANDLER_ONCHANGE)
4304 print_track_data_spec(m, hist_data, data);
4308 static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
4312 for (i = 0; i < hist_data->n_field_var_hists; i++) {
4313 kfree(hist_data->field_var_hists[i]->cmd);
4314 kfree(hist_data->field_var_hists[i]);
4318 static void destroy_hist_data(struct hist_trigger_data *hist_data)
4323 destroy_hist_trigger_attrs(hist_data->attrs);
4324 destroy_hist_fields(hist_data);
4325 tracing_map_destroy(hist_data->map);
4327 destroy_actions(hist_data);
4328 destroy_field_vars(hist_data);
4329 destroy_field_var_hists(hist_data);
4334 static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
4336 struct tracing_map *map = hist_data->map;
4337 struct ftrace_event_field *field;
4338 struct hist_field *hist_field;
4341 for_each_hist_field(i, hist_data) {
4342 hist_field = hist_data->fields[i];
4343 if (hist_field->flags & HIST_FIELD_FL_KEY) {
4344 tracing_map_cmp_fn_t cmp_fn;
4346 field = hist_field->field;
4348 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
4349 cmp_fn = tracing_map_cmp_none;
4351 cmp_fn = tracing_map_cmp_num(hist_field->size,
4352 hist_field->is_signed);
4353 else if (is_string_field(field))
4354 cmp_fn = tracing_map_cmp_string;
4356 cmp_fn = tracing_map_cmp_num(field->size,
4358 idx = tracing_map_add_key_field(map,
4361 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
4362 idx = tracing_map_add_sum_field(map);
4367 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4368 idx = tracing_map_add_var(map);
4371 hist_field->var.idx = idx;
4372 hist_field->var.hist_data = hist_data;
4379 static struct hist_trigger_data *
4380 create_hist_data(unsigned int map_bits,
4381 struct hist_trigger_attrs *attrs,
4382 struct trace_event_file *file,
4385 const struct tracing_map_ops *map_ops = NULL;
4386 struct hist_trigger_data *hist_data;
4389 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
4391 return ERR_PTR(-ENOMEM);
4393 hist_data->attrs = attrs;
4394 hist_data->remove = remove;
4395 hist_data->event_file = file;
4397 ret = parse_actions(hist_data);
4401 ret = create_hist_fields(hist_data, file);
4405 ret = create_sort_keys(hist_data);
4409 map_ops = &hist_trigger_elt_data_ops;
4411 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
4412 map_ops, hist_data);
4413 if (IS_ERR(hist_data->map)) {
4414 ret = PTR_ERR(hist_data->map);
4415 hist_data->map = NULL;
4419 ret = create_tracing_map_fields(hist_data);
4425 hist_data->attrs = NULL;
4427 destroy_hist_data(hist_data);
4429 hist_data = ERR_PTR(ret);
4434 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
4435 struct tracing_map_elt *elt,
4436 struct trace_buffer *buffer, void *rec,
4437 struct ring_buffer_event *rbe,
4440 struct hist_elt_data *elt_data;
4441 struct hist_field *hist_field;
4442 unsigned int i, var_idx;
4445 elt_data = elt->private_data;
4446 elt_data->var_ref_vals = var_ref_vals;
4448 for_each_hist_val_field(i, hist_data) {
4449 hist_field = hist_data->fields[i];
4450 hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
4451 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4452 var_idx = hist_field->var.idx;
4454 if (hist_field->flags & HIST_FIELD_FL_STRING) {
4455 unsigned int str_start, var_str_idx, idx;
4456 char *str, *val_str;
4458 str_start = hist_data->n_field_var_str +
4459 hist_data->n_save_var_str;
4460 var_str_idx = hist_field->var_str_idx;
4461 idx = str_start + var_str_idx;
4463 str = elt_data->field_var_str[idx];
4464 val_str = (char *)(uintptr_t)hist_val;
4465 strscpy(str, val_str, STR_VAR_LEN_MAX);
4467 hist_val = (u64)(uintptr_t)str;
4469 tracing_map_set_var(elt, var_idx, hist_val);
4472 tracing_map_update_sum(elt, i, hist_val);
4475 for_each_hist_key_field(i, hist_data) {
4476 hist_field = hist_data->fields[i];
4477 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4478 hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
4479 var_idx = hist_field->var.idx;
4480 tracing_map_set_var(elt, var_idx, hist_val);
4484 update_field_vars(hist_data, elt, buffer, rbe, rec);
4487 static inline void add_to_key(char *compound_key, void *key,
4488 struct hist_field *key_field, void *rec)
4490 size_t size = key_field->size;
4492 if (key_field->flags & HIST_FIELD_FL_STRING) {
4493 struct ftrace_event_field *field;
4495 field = key_field->field;
4496 if (field->filter_type == FILTER_DYN_STRING)
4497 size = *(u32 *)(rec + field->offset) >> 16;
4498 else if (field->filter_type == FILTER_PTR_STRING)
4500 else if (field->filter_type == FILTER_STATIC_STRING)
4503 /* ensure NULL-termination */
4504 if (size > key_field->size - 1)
4505 size = key_field->size - 1;
4507 strncpy(compound_key + key_field->offset, (char *)key, size);
4509 memcpy(compound_key + key_field->offset, key, size);
4513 hist_trigger_actions(struct hist_trigger_data *hist_data,
4514 struct tracing_map_elt *elt,
4515 struct trace_buffer *buffer, void *rec,
4516 struct ring_buffer_event *rbe, void *key,
4519 struct action_data *data;
4522 for (i = 0; i < hist_data->n_actions; i++) {
4523 data = hist_data->actions[i];
4524 data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals);
4528 static void event_hist_trigger(struct event_trigger_data *data,
4529 struct trace_buffer *buffer, void *rec,
4530 struct ring_buffer_event *rbe)
4532 struct hist_trigger_data *hist_data = data->private_data;
4533 bool use_compound_key = (hist_data->n_keys > 1);
4534 unsigned long entries[HIST_STACKTRACE_DEPTH];
4535 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
4536 char compound_key[HIST_KEY_SIZE_MAX];
4537 struct tracing_map_elt *elt = NULL;
4538 struct hist_field *key_field;
4543 memset(compound_key, 0, hist_data->key_size);
4545 for_each_hist_key_field(i, hist_data) {
4546 key_field = hist_data->fields[i];
4548 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4549 memset(entries, 0, HIST_STACKTRACE_SIZE);
4550 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
4551 HIST_STACKTRACE_SKIP);
4554 field_contents = key_field->fn(key_field, elt, buffer, rbe, rec);
4555 if (key_field->flags & HIST_FIELD_FL_STRING) {
4556 key = (void *)(unsigned long)field_contents;
4557 use_compound_key = true;
4559 key = (void *)&field_contents;
4562 if (use_compound_key)
4563 add_to_key(compound_key, key, key_field, rec);
4566 if (use_compound_key)
4569 if (hist_data->n_var_refs &&
4570 !resolve_var_refs(hist_data, key, var_ref_vals, false))
4573 elt = tracing_map_insert(hist_data->map, key);
4577 hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals);
4579 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
4580 hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals);
4583 static void hist_trigger_stacktrace_print(struct seq_file *m,
4584 unsigned long *stacktrace_entries,
4585 unsigned int max_entries)
4587 char str[KSYM_SYMBOL_LEN];
4588 unsigned int spaces = 8;
4591 for (i = 0; i < max_entries; i++) {
4592 if (!stacktrace_entries[i])
4595 seq_printf(m, "%*c", 1 + spaces, ' ');
4596 sprint_symbol(str, stacktrace_entries[i]);
4597 seq_printf(m, "%s\n", str);
4601 static void hist_trigger_print_key(struct seq_file *m,
4602 struct hist_trigger_data *hist_data,
4604 struct tracing_map_elt *elt)
4606 struct hist_field *key_field;
4607 char str[KSYM_SYMBOL_LEN];
4608 bool multiline = false;
4609 const char *field_name;
4615 for_each_hist_key_field(i, hist_data) {
4616 key_field = hist_data->fields[i];
4618 if (i > hist_data->n_vals)
4621 field_name = hist_field_name(key_field, 0);
4623 if (key_field->flags & HIST_FIELD_FL_HEX) {
4624 uval = *(u64 *)(key + key_field->offset);
4625 seq_printf(m, "%s: %llx", field_name, uval);
4626 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
4627 uval = *(u64 *)(key + key_field->offset);
4628 sprint_symbol_no_offset(str, uval);
4629 seq_printf(m, "%s: [%llx] %-45s", field_name,
4631 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
4632 uval = *(u64 *)(key + key_field->offset);
4633 sprint_symbol(str, uval);
4634 seq_printf(m, "%s: [%llx] %-55s", field_name,
4636 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
4637 struct hist_elt_data *elt_data = elt->private_data;
4640 if (WARN_ON_ONCE(!elt_data))
4643 comm = elt_data->comm;
4645 uval = *(u64 *)(key + key_field->offset);
4646 seq_printf(m, "%s: %-16s[%10llu]", field_name,
4648 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
4649 const char *syscall_name;
4651 uval = *(u64 *)(key + key_field->offset);
4652 syscall_name = get_syscall_name(uval);
4654 syscall_name = "unknown_syscall";
4656 seq_printf(m, "%s: %-30s[%3llu]", field_name,
4657 syscall_name, uval);
4658 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4659 seq_puts(m, "stacktrace:\n");
4660 hist_trigger_stacktrace_print(m,
4661 key + key_field->offset,
4662 HIST_STACKTRACE_DEPTH);
4664 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
4665 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4666 *(u64 *)(key + key_field->offset));
4667 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
4668 seq_printf(m, "%s: %-50s", field_name,
4669 (char *)(key + key_field->offset));
4671 uval = *(u64 *)(key + key_field->offset);
4672 seq_printf(m, "%s: %10llu", field_name, uval);
4682 static void hist_trigger_entry_print(struct seq_file *m,
4683 struct hist_trigger_data *hist_data,
4685 struct tracing_map_elt *elt)
4687 const char *field_name;
4690 hist_trigger_print_key(m, hist_data, key, elt);
4692 seq_printf(m, " hitcount: %10llu",
4693 tracing_map_read_sum(elt, HITCOUNT_IDX));
4695 for (i = 1; i < hist_data->n_vals; i++) {
4696 field_name = hist_field_name(hist_data->fields[i], 0);
4698 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
4699 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
4702 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
4703 seq_printf(m, " %s: %10llx", field_name,
4704 tracing_map_read_sum(elt, i));
4706 seq_printf(m, " %s: %10llu", field_name,
4707 tracing_map_read_sum(elt, i));
4711 print_actions(m, hist_data, elt);
4716 static int print_entries(struct seq_file *m,
4717 struct hist_trigger_data *hist_data)
4719 struct tracing_map_sort_entry **sort_entries = NULL;
4720 struct tracing_map *map = hist_data->map;
4723 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
4724 hist_data->n_sort_keys,
4729 for (i = 0; i < n_entries; i++)
4730 hist_trigger_entry_print(m, hist_data,
4731 sort_entries[i]->key,
4732 sort_entries[i]->elt);
4734 tracing_map_destroy_sort_entries(sort_entries, n_entries);
4739 static void hist_trigger_show(struct seq_file *m,
4740 struct event_trigger_data *data, int n)
4742 struct hist_trigger_data *hist_data;
4746 seq_puts(m, "\n\n");
4748 seq_puts(m, "# event histogram\n#\n# trigger info: ");
4749 data->ops->print(m, data->ops, data);
4750 seq_puts(m, "#\n\n");
4752 hist_data = data->private_data;
4753 n_entries = print_entries(m, hist_data);
4757 track_data_snapshot_print(m, hist_data);
4759 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
4760 (u64)atomic64_read(&hist_data->map->hits),
4761 n_entries, (u64)atomic64_read(&hist_data->map->drops));
4764 static int hist_show(struct seq_file *m, void *v)
4766 struct event_trigger_data *data;
4767 struct trace_event_file *event_file;
4770 mutex_lock(&event_mutex);
4772 event_file = event_file_data(m->private);
4773 if (unlikely(!event_file)) {
4778 list_for_each_entry(data, &event_file->triggers, list) {
4779 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
4780 hist_trigger_show(m, data, n++);
4784 mutex_unlock(&event_mutex);
4789 static int event_hist_open(struct inode *inode, struct file *file)
4793 ret = security_locked_down(LOCKDOWN_TRACEFS);
4797 return single_open(file, hist_show, file);
4800 const struct file_operations event_hist_fops = {
4801 .open = event_hist_open,
4803 .llseek = seq_lseek,
4804 .release = single_release,
4807 #ifdef CONFIG_HIST_TRIGGERS_DEBUG
4808 static void hist_field_debug_show_flags(struct seq_file *m,
4809 unsigned long flags)
4811 seq_puts(m, " flags:\n");
4813 if (flags & HIST_FIELD_FL_KEY)
4814 seq_puts(m, " HIST_FIELD_FL_KEY\n");
4815 else if (flags & HIST_FIELD_FL_HITCOUNT)
4816 seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n");
4817 else if (flags & HIST_FIELD_FL_VAR)
4818 seq_puts(m, " HIST_FIELD_FL_VAR\n");
4819 else if (flags & HIST_FIELD_FL_VAR_REF)
4820 seq_puts(m, " HIST_FIELD_FL_VAR_REF\n");
4822 seq_puts(m, " VAL: normal u64 value\n");
4824 if (flags & HIST_FIELD_FL_ALIAS)
4825 seq_puts(m, " HIST_FIELD_FL_ALIAS\n");
4828 static int hist_field_debug_show(struct seq_file *m,
4829 struct hist_field *field, unsigned long flags)
4831 if ((field->flags & flags) != flags) {
4832 seq_printf(m, "ERROR: bad flags - %lx\n", flags);
4836 hist_field_debug_show_flags(m, field->flags);
4838 seq_printf(m, " ftrace_event_field name: %s\n",
4839 field->field->name);
4841 if (field->flags & HIST_FIELD_FL_VAR) {
4842 seq_printf(m, " var.name: %s\n", field->var.name);
4843 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
4847 if (field->flags & HIST_FIELD_FL_ALIAS)
4848 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
4849 field->var_ref_idx);
4851 if (field->flags & HIST_FIELD_FL_VAR_REF) {
4852 seq_printf(m, " name: %s\n", field->name);
4853 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
4855 seq_printf(m, " var.hist_data: %p\n", field->var.hist_data);
4856 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
4857 field->var_ref_idx);
4859 seq_printf(m, " system: %s\n", field->system);
4860 if (field->event_name)
4861 seq_printf(m, " event_name: %s\n", field->event_name);
4864 seq_printf(m, " type: %s\n", field->type);
4865 seq_printf(m, " size: %u\n", field->size);
4866 seq_printf(m, " is_signed: %u\n", field->is_signed);
4871 static int field_var_debug_show(struct seq_file *m,
4872 struct field_var *field_var, unsigned int i,
4875 const char *vars_name = save_vars ? "save_vars" : "field_vars";
4876 struct hist_field *field;
4879 seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i);
4881 field = field_var->var;
4883 seq_printf(m, "\n %s[%d].var:\n", vars_name, i);
4885 hist_field_debug_show_flags(m, field->flags);
4886 seq_printf(m, " var.name: %s\n", field->var.name);
4887 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
4890 field = field_var->val;
4892 seq_printf(m, "\n %s[%d].val:\n", vars_name, i);
4894 seq_printf(m, " ftrace_event_field name: %s\n",
4895 field->field->name);
4901 seq_printf(m, " type: %s\n", field->type);
4902 seq_printf(m, " size: %u\n", field->size);
4903 seq_printf(m, " is_signed: %u\n", field->is_signed);
4908 static int hist_action_debug_show(struct seq_file *m,
4909 struct action_data *data, int i)
4913 if (data->handler == HANDLER_ONMAX ||
4914 data->handler == HANDLER_ONCHANGE) {
4915 seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i);
4916 ret = hist_field_debug_show(m, data->track_data.var_ref,
4917 HIST_FIELD_FL_VAR_REF);
4921 seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i);
4922 ret = hist_field_debug_show(m, data->track_data.track_var,
4928 if (data->handler == HANDLER_ONMATCH) {
4929 seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n",
4930 i, data->match_data.event_system);
4931 seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n",
4932 i, data->match_data.event);
4938 static int hist_actions_debug_show(struct seq_file *m,
4939 struct hist_trigger_data *hist_data)
4943 if (hist_data->n_actions)
4944 seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n");
4946 for (i = 0; i < hist_data->n_actions; i++) {
4947 struct action_data *action = hist_data->actions[i];
4949 ret = hist_action_debug_show(m, action, i);
4954 if (hist_data->n_save_vars)
4955 seq_puts(m, "\n save action variables (save() params):\n");
4957 for (i = 0; i < hist_data->n_save_vars; i++) {
4958 ret = field_var_debug_show(m, hist_data->save_vars[i], i, true);
4966 static void hist_trigger_debug_show(struct seq_file *m,
4967 struct event_trigger_data *data, int n)
4969 struct hist_trigger_data *hist_data;
4973 seq_puts(m, "\n\n");
4975 seq_puts(m, "# event histogram\n#\n# trigger info: ");
4976 data->ops->print(m, data->ops, data);
4977 seq_puts(m, "#\n\n");
4979 hist_data = data->private_data;
4981 seq_printf(m, "hist_data: %p\n\n", hist_data);
4982 seq_printf(m, " n_vals: %u\n", hist_data->n_vals);
4983 seq_printf(m, " n_keys: %u\n", hist_data->n_keys);
4984 seq_printf(m, " n_fields: %u\n", hist_data->n_fields);
4986 seq_puts(m, "\n val fields:\n\n");
4988 seq_puts(m, " hist_data->fields[0]:\n");
4989 ret = hist_field_debug_show(m, hist_data->fields[0],
4990 HIST_FIELD_FL_HITCOUNT);
4994 for (i = 1; i < hist_data->n_vals; i++) {
4995 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
4996 ret = hist_field_debug_show(m, hist_data->fields[i], 0);
5001 seq_puts(m, "\n key fields:\n");
5003 for (i = hist_data->n_vals; i < hist_data->n_fields; i++) {
5004 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5005 ret = hist_field_debug_show(m, hist_data->fields[i],
5011 if (hist_data->n_var_refs)
5012 seq_puts(m, "\n variable reference fields:\n");
5014 for (i = 0; i < hist_data->n_var_refs; i++) {
5015 seq_printf(m, "\n hist_data->var_refs[%d]:\n", i);
5016 ret = hist_field_debug_show(m, hist_data->var_refs[i],
5017 HIST_FIELD_FL_VAR_REF);
5022 if (hist_data->n_field_vars)
5023 seq_puts(m, "\n field variables:\n");
5025 for (i = 0; i < hist_data->n_field_vars; i++) {
5026 ret = field_var_debug_show(m, hist_data->field_vars[i], i, false);
5031 ret = hist_actions_debug_show(m, hist_data);
5036 static int hist_debug_show(struct seq_file *m, void *v)
5038 struct event_trigger_data *data;
5039 struct trace_event_file *event_file;
5042 mutex_lock(&event_mutex);
5044 event_file = event_file_data(m->private);
5045 if (unlikely(!event_file)) {
5050 list_for_each_entry(data, &event_file->triggers, list) {
5051 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5052 hist_trigger_debug_show(m, data, n++);
5056 mutex_unlock(&event_mutex);
5061 static int event_hist_debug_open(struct inode *inode, struct file *file)
5065 ret = security_locked_down(LOCKDOWN_TRACEFS);
5069 return single_open(file, hist_debug_show, file);
5072 const struct file_operations event_hist_debug_fops = {
5073 .open = event_hist_debug_open,
5075 .llseek = seq_lseek,
5076 .release = single_release,
5080 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5082 const char *field_name = hist_field_name(hist_field, 0);
5084 if (hist_field->var.name)
5085 seq_printf(m, "%s=", hist_field->var.name);
5087 if (hist_field->flags & HIST_FIELD_FL_CPU)
5089 else if (field_name) {
5090 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5091 hist_field->flags & HIST_FIELD_FL_ALIAS)
5093 seq_printf(m, "%s", field_name);
5094 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5095 seq_puts(m, "common_timestamp");
5097 if (hist_field->flags) {
5098 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5099 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5100 const char *flags = get_hist_field_flags(hist_field);
5103 seq_printf(m, ".%s", flags);
5108 static int event_hist_trigger_print(struct seq_file *m,
5109 struct event_trigger_ops *ops,
5110 struct event_trigger_data *data)
5112 struct hist_trigger_data *hist_data = data->private_data;
5113 struct hist_field *field;
5114 bool have_var = false;
5117 seq_puts(m, "hist:");
5120 seq_printf(m, "%s:", data->name);
5122 seq_puts(m, "keys=");
5124 for_each_hist_key_field(i, hist_data) {
5125 field = hist_data->fields[i];
5127 if (i > hist_data->n_vals)
5130 if (field->flags & HIST_FIELD_FL_STACKTRACE)
5131 seq_puts(m, "stacktrace");
5133 hist_field_print(m, field);
5136 seq_puts(m, ":vals=");
5138 for_each_hist_val_field(i, hist_data) {
5139 field = hist_data->fields[i];
5140 if (field->flags & HIST_FIELD_FL_VAR) {
5145 if (i == HITCOUNT_IDX)
5146 seq_puts(m, "hitcount");
5149 hist_field_print(m, field);
5158 for_each_hist_val_field(i, hist_data) {
5159 field = hist_data->fields[i];
5161 if (field->flags & HIST_FIELD_FL_VAR) {
5164 hist_field_print(m, field);
5169 seq_puts(m, ":sort=");
5171 for (i = 0; i < hist_data->n_sort_keys; i++) {
5172 struct tracing_map_sort_key *sort_key;
5173 unsigned int idx, first_key_idx;
5176 first_key_idx = hist_data->n_vals - hist_data->n_vars;
5178 sort_key = &hist_data->sort_keys[i];
5179 idx = sort_key->field_idx;
5181 if (WARN_ON(idx >= HIST_FIELDS_MAX))
5187 if (idx == HITCOUNT_IDX)
5188 seq_puts(m, "hitcount");
5190 if (idx >= first_key_idx)
5191 idx += hist_data->n_vars;
5192 hist_field_print(m, hist_data->fields[idx]);
5195 if (sort_key->descending)
5196 seq_puts(m, ".descending");
5198 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
5199 if (hist_data->enable_timestamps)
5200 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
5202 print_actions_spec(m, hist_data);
5204 if (data->filter_str)
5205 seq_printf(m, " if %s", data->filter_str);
5208 seq_puts(m, " [paused]");
5210 seq_puts(m, " [active]");
5217 static int event_hist_trigger_init(struct event_trigger_ops *ops,
5218 struct event_trigger_data *data)
5220 struct hist_trigger_data *hist_data = data->private_data;
5222 if (!data->ref && hist_data->attrs->name)
5223 save_named_trigger(hist_data->attrs->name, data);
5230 static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5232 struct trace_event_file *file;
5237 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5238 file = hist_data->field_var_hists[i]->hist_data->event_file;
5239 cmd = hist_data->field_var_hists[i]->cmd;
5240 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5241 "!hist", "hist", cmd);
5242 WARN_ON_ONCE(ret < 0);
5246 static void event_hist_trigger_free(struct event_trigger_ops *ops,
5247 struct event_trigger_data *data)
5249 struct hist_trigger_data *hist_data = data->private_data;
5251 if (WARN_ON_ONCE(data->ref <= 0))
5257 del_named_trigger(data);
5259 trigger_data_free(data);
5261 remove_hist_vars(hist_data);
5263 unregister_field_var_hists(hist_data);
5265 destroy_hist_data(hist_data);
5269 static struct event_trigger_ops event_hist_trigger_ops = {
5270 .func = event_hist_trigger,
5271 .print = event_hist_trigger_print,
5272 .init = event_hist_trigger_init,
5273 .free = event_hist_trigger_free,
5276 static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5277 struct event_trigger_data *data)
5281 save_named_trigger(data->named_data->name, data);
5283 event_hist_trigger_init(ops, data->named_data);
5288 static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5289 struct event_trigger_data *data)
5291 if (WARN_ON_ONCE(data->ref <= 0))
5294 event_hist_trigger_free(ops, data->named_data);
5298 del_named_trigger(data);
5299 trigger_data_free(data);
5303 static struct event_trigger_ops event_hist_trigger_named_ops = {
5304 .func = event_hist_trigger,
5305 .print = event_hist_trigger_print,
5306 .init = event_hist_trigger_named_init,
5307 .free = event_hist_trigger_named_free,
5310 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5313 return &event_hist_trigger_ops;
5316 static void hist_clear(struct event_trigger_data *data)
5318 struct hist_trigger_data *hist_data = data->private_data;
5321 pause_named_trigger(data);
5323 tracepoint_synchronize_unregister();
5325 tracing_map_clear(hist_data->map);
5328 unpause_named_trigger(data);
5331 static bool compatible_field(struct ftrace_event_field *field,
5332 struct ftrace_event_field *test_field)
5334 if (field == test_field)
5336 if (field == NULL || test_field == NULL)
5338 if (strcmp(field->name, test_field->name) != 0)
5340 if (strcmp(field->type, test_field->type) != 0)
5342 if (field->size != test_field->size)
5344 if (field->is_signed != test_field->is_signed)
5350 static bool hist_trigger_match(struct event_trigger_data *data,
5351 struct event_trigger_data *data_test,
5352 struct event_trigger_data *named_data,
5355 struct tracing_map_sort_key *sort_key, *sort_key_test;
5356 struct hist_trigger_data *hist_data, *hist_data_test;
5357 struct hist_field *key_field, *key_field_test;
5360 if (named_data && (named_data != data_test) &&
5361 (named_data != data_test->named_data))
5364 if (!named_data && is_named_trigger(data_test))
5367 hist_data = data->private_data;
5368 hist_data_test = data_test->private_data;
5370 if (hist_data->n_vals != hist_data_test->n_vals ||
5371 hist_data->n_fields != hist_data_test->n_fields ||
5372 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5375 if (!ignore_filter) {
5376 if ((data->filter_str && !data_test->filter_str) ||
5377 (!data->filter_str && data_test->filter_str))
5381 for_each_hist_field(i, hist_data) {
5382 key_field = hist_data->fields[i];
5383 key_field_test = hist_data_test->fields[i];
5385 if (key_field->flags != key_field_test->flags)
5387 if (!compatible_field(key_field->field, key_field_test->field))
5389 if (key_field->offset != key_field_test->offset)
5391 if (key_field->size != key_field_test->size)
5393 if (key_field->is_signed != key_field_test->is_signed)
5395 if (!!key_field->var.name != !!key_field_test->var.name)
5397 if (key_field->var.name &&
5398 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5402 for (i = 0; i < hist_data->n_sort_keys; i++) {
5403 sort_key = &hist_data->sort_keys[i];
5404 sort_key_test = &hist_data_test->sort_keys[i];
5406 if (sort_key->field_idx != sort_key_test->field_idx ||
5407 sort_key->descending != sort_key_test->descending)
5411 if (!ignore_filter && data->filter_str &&
5412 (strcmp(data->filter_str, data_test->filter_str) != 0))
5415 if (!actions_match(hist_data, hist_data_test))
5421 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5422 struct event_trigger_data *data,
5423 struct trace_event_file *file)
5425 struct hist_trigger_data *hist_data = data->private_data;
5426 struct event_trigger_data *test, *named_data = NULL;
5427 struct trace_array *tr = file->tr;
5430 if (hist_data->attrs->name) {
5431 named_data = find_named_trigger(hist_data->attrs->name);
5433 if (!hist_trigger_match(data, named_data, named_data,
5435 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5442 if (hist_data->attrs->name && !named_data)
5445 lockdep_assert_held(&event_mutex);
5447 list_for_each_entry(test, &file->triggers, list) {
5448 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5449 if (!hist_trigger_match(data, test, named_data, false))
5451 if (hist_data->attrs->pause)
5452 test->paused = true;
5453 else if (hist_data->attrs->cont)
5454 test->paused = false;
5455 else if (hist_data->attrs->clear)
5458 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
5465 if (hist_data->attrs->cont || hist_data->attrs->clear) {
5466 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
5471 if (hist_data->attrs->pause)
5472 data->paused = true;
5475 data->private_data = named_data->private_data;
5476 set_named_trigger_data(data, named_data);
5477 data->ops = &event_hist_trigger_named_ops;
5480 if (data->ops->init) {
5481 ret = data->ops->init(data->ops, data);
5486 if (hist_data->enable_timestamps) {
5487 char *clock = hist_data->attrs->clock;
5489 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5491 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
5495 tracing_set_filter_buffering(file->tr, true);
5499 destroy_hist_data(hist_data);
5506 static int hist_trigger_enable(struct event_trigger_data *data,
5507 struct trace_event_file *file)
5511 list_add_tail_rcu(&data->list, &file->triggers);
5513 update_cond_flag(file);
5515 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5516 list_del_rcu(&data->list);
5517 update_cond_flag(file);
5524 static bool have_hist_trigger_match(struct event_trigger_data *data,
5525 struct trace_event_file *file)
5527 struct hist_trigger_data *hist_data = data->private_data;
5528 struct event_trigger_data *test, *named_data = NULL;
5531 lockdep_assert_held(&event_mutex);
5533 if (hist_data->attrs->name)
5534 named_data = find_named_trigger(hist_data->attrs->name);
5536 list_for_each_entry(test, &file->triggers, list) {
5537 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5538 if (hist_trigger_match(data, test, named_data, false)) {
5548 static bool hist_trigger_check_refs(struct event_trigger_data *data,
5549 struct trace_event_file *file)
5551 struct hist_trigger_data *hist_data = data->private_data;
5552 struct event_trigger_data *test, *named_data = NULL;
5554 lockdep_assert_held(&event_mutex);
5556 if (hist_data->attrs->name)
5557 named_data = find_named_trigger(hist_data->attrs->name);
5559 list_for_each_entry(test, &file->triggers, list) {
5560 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5561 if (!hist_trigger_match(data, test, named_data, false))
5563 hist_data = test->private_data;
5564 if (check_var_refs(hist_data))
5573 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
5574 struct event_trigger_data *data,
5575 struct trace_event_file *file)
5577 struct hist_trigger_data *hist_data = data->private_data;
5578 struct event_trigger_data *test, *named_data = NULL;
5579 bool unregistered = false;
5581 lockdep_assert_held(&event_mutex);
5583 if (hist_data->attrs->name)
5584 named_data = find_named_trigger(hist_data->attrs->name);
5586 list_for_each_entry(test, &file->triggers, list) {
5587 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5588 if (!hist_trigger_match(data, test, named_data, false))
5590 unregistered = true;
5591 list_del_rcu(&test->list);
5592 trace_event_trigger_enable_disable(file, 0);
5593 update_cond_flag(file);
5598 if (unregistered && test->ops->free)
5599 test->ops->free(test->ops, test);
5601 if (hist_data->enable_timestamps) {
5602 if (!hist_data->remove || unregistered)
5603 tracing_set_filter_buffering(file->tr, false);
5607 static bool hist_file_check_refs(struct trace_event_file *file)
5609 struct hist_trigger_data *hist_data;
5610 struct event_trigger_data *test;
5612 lockdep_assert_held(&event_mutex);
5614 list_for_each_entry(test, &file->triggers, list) {
5615 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5616 hist_data = test->private_data;
5617 if (check_var_refs(hist_data))
5625 static void hist_unreg_all(struct trace_event_file *file)
5627 struct event_trigger_data *test, *n;
5628 struct hist_trigger_data *hist_data;
5629 struct synth_event *se;
5630 const char *se_name;
5632 lockdep_assert_held(&event_mutex);
5634 if (hist_file_check_refs(file))
5637 list_for_each_entry_safe(test, n, &file->triggers, list) {
5638 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5639 hist_data = test->private_data;
5640 list_del_rcu(&test->list);
5641 trace_event_trigger_enable_disable(file, 0);
5643 se_name = trace_event_name(file->event_call);
5644 se = find_synth_event(se_name);
5648 update_cond_flag(file);
5649 if (hist_data->enable_timestamps)
5650 tracing_set_filter_buffering(file->tr, false);
5651 if (test->ops->free)
5652 test->ops->free(test->ops, test);
5657 static int event_hist_trigger_func(struct event_command *cmd_ops,
5658 struct trace_event_file *file,
5659 char *glob, char *cmd, char *param)
5661 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
5662 struct event_trigger_data *trigger_data;
5663 struct hist_trigger_attrs *attrs;
5664 struct event_trigger_ops *trigger_ops;
5665 struct hist_trigger_data *hist_data;
5666 struct synth_event *se;
5667 const char *se_name;
5668 bool remove = false;
5672 lockdep_assert_held(&event_mutex);
5674 if (glob && strlen(glob)) {
5676 last_cmd_set(file, param);
5686 * separate the trigger from the filter (k:v [if filter])
5687 * allowing for whitespace in the trigger
5689 p = trigger = param;
5691 p = strstr(p, "if");
5696 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
5700 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
5702 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
5713 param = strstrip(p);
5714 trigger = strstrip(trigger);
5717 attrs = parse_hist_trigger_attrs(file->tr, trigger);
5719 return PTR_ERR(attrs);
5721 if (attrs->map_bits)
5722 hist_trigger_bits = attrs->map_bits;
5724 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
5725 if (IS_ERR(hist_data)) {
5726 destroy_hist_trigger_attrs(attrs);
5727 return PTR_ERR(hist_data);
5730 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
5732 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
5733 if (!trigger_data) {
5738 trigger_data->count = -1;
5739 trigger_data->ops = trigger_ops;
5740 trigger_data->cmd_ops = cmd_ops;
5742 INIT_LIST_HEAD(&trigger_data->list);
5743 RCU_INIT_POINTER(trigger_data->filter, NULL);
5745 trigger_data->private_data = hist_data;
5747 /* if param is non-empty, it's supposed to be a filter */
5748 if (param && cmd_ops->set_filter) {
5749 ret = cmd_ops->set_filter(param, trigger_data, file);
5755 if (!have_hist_trigger_match(trigger_data, file))
5758 if (hist_trigger_check_refs(trigger_data, file)) {
5763 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5764 se_name = trace_event_name(file->event_call);
5765 se = find_synth_event(se_name);
5772 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
5774 * The above returns on success the # of triggers registered,
5775 * but if it didn't register any it returns zero. Consider no
5776 * triggers registered a failure too.
5779 if (!(attrs->pause || attrs->cont || attrs->clear))
5785 if (get_named_trigger_data(trigger_data))
5788 if (has_hist_vars(hist_data))
5789 save_hist_vars(hist_data);
5791 ret = create_actions(hist_data);
5795 ret = tracing_map_init(hist_data->map);
5799 ret = hist_trigger_enable(trigger_data, file);
5803 se_name = trace_event_name(file->event_call);
5804 se = find_synth_event(se_name);
5807 /* Just return zero, not the number of registered triggers */
5815 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5817 if (cmd_ops->set_filter)
5818 cmd_ops->set_filter(NULL, trigger_data, NULL);
5820 remove_hist_vars(hist_data);
5822 kfree(trigger_data);
5824 destroy_hist_data(hist_data);
5828 static struct event_command trigger_hist_cmd = {
5830 .trigger_type = ETT_EVENT_HIST,
5831 .flags = EVENT_CMD_FL_NEEDS_REC,
5832 .func = event_hist_trigger_func,
5833 .reg = hist_register_trigger,
5834 .unreg = hist_unregister_trigger,
5835 .unreg_all = hist_unreg_all,
5836 .get_trigger_ops = event_hist_get_trigger_ops,
5837 .set_filter = set_trigger_filter,
5840 __init int register_trigger_hist_cmd(void)
5844 ret = register_event_command(&trigger_hist_cmd);
5851 hist_enable_trigger(struct event_trigger_data *data,
5852 struct trace_buffer *buffer, void *rec,
5853 struct ring_buffer_event *event)
5855 struct enable_trigger_data *enable_data = data->private_data;
5856 struct event_trigger_data *test;
5858 list_for_each_entry_rcu(test, &enable_data->file->triggers, list,
5859 lockdep_is_held(&event_mutex)) {
5860 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5861 if (enable_data->enable)
5862 test->paused = false;
5864 test->paused = true;
5870 hist_enable_count_trigger(struct event_trigger_data *data,
5871 struct trace_buffer *buffer, void *rec,
5872 struct ring_buffer_event *event)
5877 if (data->count != -1)
5880 hist_enable_trigger(data, buffer, rec, event);
5883 static struct event_trigger_ops hist_enable_trigger_ops = {
5884 .func = hist_enable_trigger,
5885 .print = event_enable_trigger_print,
5886 .init = event_trigger_init,
5887 .free = event_enable_trigger_free,
5890 static struct event_trigger_ops hist_enable_count_trigger_ops = {
5891 .func = hist_enable_count_trigger,
5892 .print = event_enable_trigger_print,
5893 .init = event_trigger_init,
5894 .free = event_enable_trigger_free,
5897 static struct event_trigger_ops hist_disable_trigger_ops = {
5898 .func = hist_enable_trigger,
5899 .print = event_enable_trigger_print,
5900 .init = event_trigger_init,
5901 .free = event_enable_trigger_free,
5904 static struct event_trigger_ops hist_disable_count_trigger_ops = {
5905 .func = hist_enable_count_trigger,
5906 .print = event_enable_trigger_print,
5907 .init = event_trigger_init,
5908 .free = event_enable_trigger_free,
5911 static struct event_trigger_ops *
5912 hist_enable_get_trigger_ops(char *cmd, char *param)
5914 struct event_trigger_ops *ops;
5917 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
5920 ops = param ? &hist_enable_count_trigger_ops :
5921 &hist_enable_trigger_ops;
5923 ops = param ? &hist_disable_count_trigger_ops :
5924 &hist_disable_trigger_ops;
5929 static void hist_enable_unreg_all(struct trace_event_file *file)
5931 struct event_trigger_data *test, *n;
5933 list_for_each_entry_safe(test, n, &file->triggers, list) {
5934 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
5935 list_del_rcu(&test->list);
5936 update_cond_flag(file);
5937 trace_event_trigger_enable_disable(file, 0);
5938 if (test->ops->free)
5939 test->ops->free(test->ops, test);
5944 static struct event_command trigger_hist_enable_cmd = {
5945 .name = ENABLE_HIST_STR,
5946 .trigger_type = ETT_HIST_ENABLE,
5947 .func = event_enable_trigger_func,
5948 .reg = event_enable_register_trigger,
5949 .unreg = event_enable_unregister_trigger,
5950 .unreg_all = hist_enable_unreg_all,
5951 .get_trigger_ops = hist_enable_get_trigger_ops,
5952 .set_filter = set_trigger_filter,
5955 static struct event_command trigger_hist_disable_cmd = {
5956 .name = DISABLE_HIST_STR,
5957 .trigger_type = ETT_HIST_ENABLE,
5958 .func = event_enable_trigger_func,
5959 .reg = event_enable_register_trigger,
5960 .unreg = event_enable_unregister_trigger,
5961 .unreg_all = hist_enable_unreg_all,
5962 .get_trigger_ops = hist_enable_get_trigger_ops,
5963 .set_filter = set_trigger_filter,
5966 static __init void unregister_trigger_hist_enable_disable_cmds(void)
5968 unregister_event_command(&trigger_hist_enable_cmd);
5969 unregister_event_command(&trigger_hist_disable_cmd);
5972 __init int register_trigger_hist_enable_disable_cmds(void)
5976 ret = register_event_command(&trigger_hist_enable_cmd);
5977 if (WARN_ON(ret < 0))
5979 ret = register_event_command(&trigger_hist_disable_cmd);
5980 if (WARN_ON(ret < 0))
5981 unregister_trigger_hist_enable_disable_cmds();