1 // SPDX-License-Identifier: GPL-2.0
3 * trace_events_hist - trace event hist triggers
5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
8 #include <linux/module.h>
9 #include <linux/kallsyms.h>
10 #include <linux/security.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/stacktrace.h>
14 #include <linux/rculist.h>
15 #include <linux/tracefs.h>
17 /* for gfp flag names */
18 #include <linux/trace_events.h>
19 #include <trace/events/mmflags.h>
21 #include "tracing_map.h"
22 #include "trace_synth.h"
25 C(NONE, "No error"), \
26 C(DUPLICATE_VAR, "Variable already defined"), \
27 C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
28 C(TOO_MANY_VARS, "Too many variables defined"), \
29 C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
30 C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
31 C(TRIGGER_EEXIST, "Hist trigger already exists"), \
32 C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
33 C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
34 C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
35 C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
36 C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
37 C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
38 C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
39 C(HIST_NOT_FOUND, "Matching event histogram not found"), \
40 C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
41 C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
42 C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
43 C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
44 C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
45 C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
46 C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
47 C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
48 C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
49 C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
50 C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
51 C(TOO_MANY_PARAMS, "Too many action params"), \
52 C(PARAM_NOT_FOUND, "Couldn't find param"), \
53 C(INVALID_PARAM, "Invalid action param"), \
54 C(ACTION_NOT_FOUND, "No action found"), \
55 C(NO_SAVE_PARAMS, "No params found for save()"), \
56 C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
57 C(ACTION_MISMATCH, "Handler doesn't support action"), \
58 C(NO_CLOSING_PAREN, "No closing paren found"), \
59 C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
60 C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
61 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
62 C(VAR_NOT_FOUND, "Couldn't find variable"), \
63 C(FIELD_NOT_FOUND, "Couldn't find field"), \
64 C(EMPTY_ASSIGNMENT, "Empty assignment"), \
65 C(INVALID_SORT_MODIFIER,"Invalid sort modifier"), \
66 C(EMPTY_SORT_FIELD, "Empty sort field"), \
67 C(TOO_MANY_SORT_FIELDS, "Too many sort fields (Max = 2)"), \
68 C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \
69 C(INVALID_STR_OPERAND, "String type can not be an operand in expression"),
72 #define C(a, b) HIST_ERR_##a
79 static const char *err_text[] = { ERRORS };
83 typedef u64 (*hist_field_fn_t) (struct hist_field *field,
84 struct tracing_map_elt *elt,
85 struct trace_buffer *buffer,
86 struct ring_buffer_event *rbe,
89 #define HIST_FIELD_OPERANDS_MAX 2
90 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
91 #define HIST_ACTIONS_MAX 8
101 * A hist_var (histogram variable) contains variable information for
102 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
103 * flag set. A hist_var has a variable name e.g. ts0, and is
104 * associated with a given histogram trigger, as specified by
105 * hist_data. The hist_var idx is the unique index assigned to the
106 * variable by the hist trigger's tracing_map. The idx is what is
107 * used to set a variable's value and, by a variable reference, to
112 struct hist_trigger_data *hist_data;
117 struct ftrace_event_field *field;
123 unsigned int is_signed;
124 unsigned long buckets;
126 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
127 struct hist_trigger_data *hist_data;
130 * Variable fields contain variable-specific info in var.
133 enum field_op_id operator;
138 * The name field is used for EXPR and VAR_REF fields. VAR
139 * fields contain the variable name in var.name.
144 * When a histogram trigger is hit, if it has any references
145 * to variables, the values of those variables are collected
146 * into a var_ref_vals array by resolve_var_refs(). The
147 * current value of each variable is read from the tracing_map
148 * using the hist field's hist_var.idx and entered into the
149 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
151 unsigned int var_ref_idx;
154 unsigned int var_str_idx;
157 static u64 hist_field_none(struct hist_field *field,
158 struct tracing_map_elt *elt,
159 struct trace_buffer *buffer,
160 struct ring_buffer_event *rbe,
166 static u64 hist_field_counter(struct hist_field *field,
167 struct tracing_map_elt *elt,
168 struct trace_buffer *buffer,
169 struct ring_buffer_event *rbe,
175 static u64 hist_field_string(struct hist_field *hist_field,
176 struct tracing_map_elt *elt,
177 struct trace_buffer *buffer,
178 struct ring_buffer_event *rbe,
181 char *addr = (char *)(event + hist_field->field->offset);
183 return (u64)(unsigned long)addr;
186 static u64 hist_field_dynstring(struct hist_field *hist_field,
187 struct tracing_map_elt *elt,
188 struct trace_buffer *buffer,
189 struct ring_buffer_event *rbe,
192 u32 str_item = *(u32 *)(event + hist_field->field->offset);
193 int str_loc = str_item & 0xffff;
194 char *addr = (char *)(event + str_loc);
196 return (u64)(unsigned long)addr;
199 static u64 hist_field_pstring(struct hist_field *hist_field,
200 struct tracing_map_elt *elt,
201 struct trace_buffer *buffer,
202 struct ring_buffer_event *rbe,
205 char **addr = (char **)(event + hist_field->field->offset);
207 return (u64)(unsigned long)*addr;
210 static u64 hist_field_log2(struct hist_field *hist_field,
211 struct tracing_map_elt *elt,
212 struct trace_buffer *buffer,
213 struct ring_buffer_event *rbe,
216 struct hist_field *operand = hist_field->operands[0];
218 u64 val = operand->fn(operand, elt, buffer, rbe, event);
220 return (u64) ilog2(roundup_pow_of_two(val));
223 static u64 hist_field_bucket(struct hist_field *hist_field,
224 struct tracing_map_elt *elt,
225 struct trace_buffer *buffer,
226 struct ring_buffer_event *rbe,
229 struct hist_field *operand = hist_field->operands[0];
230 unsigned long buckets = hist_field->buckets;
232 u64 val = operand->fn(operand, elt, buffer, rbe, event);
234 if (WARN_ON_ONCE(!buckets))
238 val = div64_ul(val, buckets);
240 val = (u64)((unsigned long)val / buckets);
241 return val * buckets;
244 static u64 hist_field_plus(struct hist_field *hist_field,
245 struct tracing_map_elt *elt,
246 struct trace_buffer *buffer,
247 struct ring_buffer_event *rbe,
250 struct hist_field *operand1 = hist_field->operands[0];
251 struct hist_field *operand2 = hist_field->operands[1];
253 u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
254 u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
259 static u64 hist_field_minus(struct hist_field *hist_field,
260 struct tracing_map_elt *elt,
261 struct trace_buffer *buffer,
262 struct ring_buffer_event *rbe,
265 struct hist_field *operand1 = hist_field->operands[0];
266 struct hist_field *operand2 = hist_field->operands[1];
268 u64 val1 = operand1->fn(operand1, elt, buffer, rbe, event);
269 u64 val2 = operand2->fn(operand2, elt, buffer, rbe, event);
274 static u64 hist_field_unary_minus(struct hist_field *hist_field,
275 struct tracing_map_elt *elt,
276 struct trace_buffer *buffer,
277 struct ring_buffer_event *rbe,
280 struct hist_field *operand = hist_field->operands[0];
282 s64 sval = (s64)operand->fn(operand, elt, buffer, rbe, event);
283 u64 val = (u64)-sval;
288 #define DEFINE_HIST_FIELD_FN(type) \
289 static u64 hist_field_##type(struct hist_field *hist_field, \
290 struct tracing_map_elt *elt, \
291 struct trace_buffer *buffer, \
292 struct ring_buffer_event *rbe, \
295 type *addr = (type *)(event + hist_field->field->offset); \
297 return (u64)(unsigned long)*addr; \
300 DEFINE_HIST_FIELD_FN(s64);
301 DEFINE_HIST_FIELD_FN(u64);
302 DEFINE_HIST_FIELD_FN(s32);
303 DEFINE_HIST_FIELD_FN(u32);
304 DEFINE_HIST_FIELD_FN(s16);
305 DEFINE_HIST_FIELD_FN(u16);
306 DEFINE_HIST_FIELD_FN(s8);
307 DEFINE_HIST_FIELD_FN(u8);
309 #define for_each_hist_field(i, hist_data) \
310 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
312 #define for_each_hist_val_field(i, hist_data) \
313 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
315 #define for_each_hist_key_field(i, hist_data) \
316 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
318 #define HIST_STACKTRACE_DEPTH 16
319 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
320 #define HIST_STACKTRACE_SKIP 5
322 #define HITCOUNT_IDX 0
323 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
325 enum hist_field_flags {
326 HIST_FIELD_FL_HITCOUNT = 1 << 0,
327 HIST_FIELD_FL_KEY = 1 << 1,
328 HIST_FIELD_FL_STRING = 1 << 2,
329 HIST_FIELD_FL_HEX = 1 << 3,
330 HIST_FIELD_FL_SYM = 1 << 4,
331 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
332 HIST_FIELD_FL_EXECNAME = 1 << 6,
333 HIST_FIELD_FL_SYSCALL = 1 << 7,
334 HIST_FIELD_FL_STACKTRACE = 1 << 8,
335 HIST_FIELD_FL_LOG2 = 1 << 9,
336 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
337 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
338 HIST_FIELD_FL_VAR = 1 << 12,
339 HIST_FIELD_FL_EXPR = 1 << 13,
340 HIST_FIELD_FL_VAR_REF = 1 << 14,
341 HIST_FIELD_FL_CPU = 1 << 15,
342 HIST_FIELD_FL_ALIAS = 1 << 16,
343 HIST_FIELD_FL_BUCKET = 1 << 17,
348 char *name[TRACING_MAP_VARS_MAX];
349 char *expr[TRACING_MAP_VARS_MAX];
352 struct hist_trigger_attrs {
362 unsigned int map_bits;
364 char *assignment_str[TRACING_MAP_VARS_MAX];
365 unsigned int n_assignments;
367 char *action_str[HIST_ACTIONS_MAX];
368 unsigned int n_actions;
370 struct var_defs var_defs;
374 struct hist_field *var;
375 struct hist_field *val;
378 struct field_var_hist {
379 struct hist_trigger_data *hist_data;
383 struct hist_trigger_data {
384 struct hist_field *fields[HIST_FIELDS_MAX];
387 unsigned int n_fields;
389 unsigned int n_var_str;
390 unsigned int key_size;
391 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
392 unsigned int n_sort_keys;
393 struct trace_event_file *event_file;
394 struct hist_trigger_attrs *attrs;
395 struct tracing_map *map;
396 bool enable_timestamps;
398 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
399 unsigned int n_var_refs;
401 struct action_data *actions[HIST_ACTIONS_MAX];
402 unsigned int n_actions;
404 struct field_var *field_vars[SYNTH_FIELDS_MAX];
405 unsigned int n_field_vars;
406 unsigned int n_field_var_str;
407 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
408 unsigned int n_field_var_hists;
410 struct field_var *save_vars[SYNTH_FIELDS_MAX];
411 unsigned int n_save_vars;
412 unsigned int n_save_var_str;
417 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
418 struct tracing_map_elt *elt,
419 struct trace_buffer *buffer, void *rec,
420 struct ring_buffer_event *rbe, void *key,
421 struct action_data *data, u64 *var_ref_vals);
423 typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
438 enum handler_id handler;
439 enum action_id action;
443 unsigned int n_params;
444 char *params[SYNTH_FIELDS_MAX];
447 * When a histogram trigger is hit, the values of any
448 * references to variables, including variables being passed
449 * as parameters to synthetic events, are collected into a
450 * var_ref_vals array. This var_ref_idx array is an array of
451 * indices into the var_ref_vals array, one for each synthetic
452 * event param, and is passed to the synthetic event
455 unsigned int var_ref_idx[TRACING_MAP_VARS_MAX];
456 struct synth_event *synth_event;
457 bool use_trace_keyword;
458 char *synth_event_name;
468 * var_str contains the $-unstripped variable
469 * name referenced by var_ref, and used when
470 * printing the action. Because var_ref
471 * creation is deferred to create_actions(),
472 * we need a per-action way to save it until
473 * then, thus var_str.
478 * var_ref refers to the variable being
479 * tracked e.g onmax($var).
481 struct hist_field *var_ref;
484 * track_var contains the 'invisible' tracking
485 * variable created to keep the current
488 struct hist_field *track_var;
490 check_track_val_fn_t check_val;
491 action_fn_t save_data;
500 unsigned int key_len;
502 struct tracing_map_elt elt;
504 struct action_data *action_data;
505 struct hist_trigger_data *hist_data;
508 struct hist_elt_data {
511 char **field_var_str;
515 struct snapshot_context {
516 struct tracing_map_elt *elt;
520 static void track_data_free(struct track_data *track_data)
522 struct hist_elt_data *elt_data;
527 kfree(track_data->key);
529 elt_data = track_data->elt.private_data;
531 kfree(elt_data->comm);
538 static struct track_data *track_data_alloc(unsigned int key_len,
539 struct action_data *action_data,
540 struct hist_trigger_data *hist_data)
542 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
543 struct hist_elt_data *elt_data;
546 return ERR_PTR(-ENOMEM);
548 data->key = kzalloc(key_len, GFP_KERNEL);
550 track_data_free(data);
551 return ERR_PTR(-ENOMEM);
554 data->key_len = key_len;
555 data->action_data = action_data;
556 data->hist_data = hist_data;
558 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
560 track_data_free(data);
561 return ERR_PTR(-ENOMEM);
564 data->elt.private_data = elt_data;
566 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
567 if (!elt_data->comm) {
568 track_data_free(data);
569 return ERR_PTR(-ENOMEM);
575 static char last_cmd[MAX_FILTER_STR_VAL];
576 static char last_cmd_loc[MAX_FILTER_STR_VAL];
578 static int errpos(char *str)
580 return err_pos(last_cmd, str);
583 static void last_cmd_set(struct trace_event_file *file, char *str)
585 const char *system = NULL, *name = NULL;
586 struct trace_event_call *call;
591 strcpy(last_cmd, "hist:");
592 strncat(last_cmd, str, MAX_FILTER_STR_VAL - 1 - sizeof("hist:"));
595 call = file->event_call;
596 system = call->class->system;
598 name = trace_event_name(call);
605 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
608 static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
610 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
614 static void hist_err_clear(void)
617 last_cmd_loc[0] = '\0';
620 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
621 unsigned int *var_ref_idx);
623 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
624 unsigned int *var_ref_idx)
626 struct tracepoint *tp = event->tp;
628 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
629 struct tracepoint_func *probe_func_ptr;
630 synth_probe_func_t probe_func;
633 if (!(cpu_online(raw_smp_processor_id())))
636 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
637 if (probe_func_ptr) {
639 probe_func = probe_func_ptr->func;
640 __data = probe_func_ptr->data;
641 probe_func(__data, var_ref_vals, var_ref_idx);
642 } while ((++probe_func_ptr)->func);
647 static void action_trace(struct hist_trigger_data *hist_data,
648 struct tracing_map_elt *elt,
649 struct trace_buffer *buffer, void *rec,
650 struct ring_buffer_event *rbe, void *key,
651 struct action_data *data, u64 *var_ref_vals)
653 struct synth_event *event = data->synth_event;
655 trace_synth(event, var_ref_vals, data->var_ref_idx);
658 struct hist_var_data {
659 struct list_head list;
660 struct hist_trigger_data *hist_data;
663 static u64 hist_field_timestamp(struct hist_field *hist_field,
664 struct tracing_map_elt *elt,
665 struct trace_buffer *buffer,
666 struct ring_buffer_event *rbe,
669 struct hist_trigger_data *hist_data = hist_field->hist_data;
670 struct trace_array *tr = hist_data->event_file->tr;
672 u64 ts = ring_buffer_event_time_stamp(buffer, rbe);
674 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
680 static u64 hist_field_cpu(struct hist_field *hist_field,
681 struct tracing_map_elt *elt,
682 struct trace_buffer *buffer,
683 struct ring_buffer_event *rbe,
686 int cpu = smp_processor_id();
692 * check_field_for_var_ref - Check if a VAR_REF field references a variable
693 * @hist_field: The VAR_REF field to check
694 * @var_data: The hist trigger that owns the variable
695 * @var_idx: The trigger variable identifier
697 * Check the given VAR_REF field to see whether or not it references
698 * the given variable associated with the given trigger.
700 * Return: The VAR_REF field if it does reference the variable, NULL if not
702 static struct hist_field *
703 check_field_for_var_ref(struct hist_field *hist_field,
704 struct hist_trigger_data *var_data,
705 unsigned int var_idx)
707 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
709 if (hist_field && hist_field->var.idx == var_idx &&
710 hist_field->var.hist_data == var_data)
717 * find_var_ref - Check if a trigger has a reference to a trigger variable
718 * @hist_data: The hist trigger that might have a reference to the variable
719 * @var_data: The hist trigger that owns the variable
720 * @var_idx: The trigger variable identifier
722 * Check the list of var_refs[] on the first hist trigger to see
723 * whether any of them are references to the variable on the second
726 * Return: The VAR_REF field referencing the variable if so, NULL if not
728 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
729 struct hist_trigger_data *var_data,
730 unsigned int var_idx)
732 struct hist_field *hist_field;
735 for (i = 0; i < hist_data->n_var_refs; i++) {
736 hist_field = hist_data->var_refs[i];
737 if (check_field_for_var_ref(hist_field, var_data, var_idx))
745 * find_any_var_ref - Check if there is a reference to a given trigger variable
746 * @hist_data: The hist trigger
747 * @var_idx: The trigger variable identifier
749 * Check to see whether the given variable is currently referenced by
752 * The trigger the variable is defined on is explicitly excluded - the
753 * assumption being that a self-reference doesn't prevent a trigger
754 * from being removed.
756 * Return: The VAR_REF field referencing the variable if so, NULL if not
758 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
759 unsigned int var_idx)
761 struct trace_array *tr = hist_data->event_file->tr;
762 struct hist_field *found = NULL;
763 struct hist_var_data *var_data;
765 list_for_each_entry(var_data, &tr->hist_vars, list) {
766 if (var_data->hist_data == hist_data)
768 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
777 * check_var_refs - Check if there is a reference to any of trigger's variables
778 * @hist_data: The hist trigger
780 * A trigger can define one or more variables. If any one of them is
781 * currently referenced by any other trigger, this function will
784 * Typically used to determine whether or not a trigger can be removed
785 * - if there are any references to a trigger's variables, it cannot.
787 * Return: True if there is a reference to any of trigger's variables
789 static bool check_var_refs(struct hist_trigger_data *hist_data)
791 struct hist_field *field;
795 for_each_hist_field(i, hist_data) {
796 field = hist_data->fields[i];
797 if (field && field->flags & HIST_FIELD_FL_VAR) {
798 if (find_any_var_ref(hist_data, field->var.idx)) {
808 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
810 struct trace_array *tr = hist_data->event_file->tr;
811 struct hist_var_data *var_data, *found = NULL;
813 list_for_each_entry(var_data, &tr->hist_vars, list) {
814 if (var_data->hist_data == hist_data) {
823 static bool field_has_hist_vars(struct hist_field *hist_field,
834 if (hist_field->flags & HIST_FIELD_FL_VAR ||
835 hist_field->flags & HIST_FIELD_FL_VAR_REF)
838 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
839 struct hist_field *operand;
841 operand = hist_field->operands[i];
842 if (field_has_hist_vars(operand, level + 1))
849 static bool has_hist_vars(struct hist_trigger_data *hist_data)
851 struct hist_field *hist_field;
854 for_each_hist_field(i, hist_data) {
855 hist_field = hist_data->fields[i];
856 if (field_has_hist_vars(hist_field, 0))
863 static int save_hist_vars(struct hist_trigger_data *hist_data)
865 struct trace_array *tr = hist_data->event_file->tr;
866 struct hist_var_data *var_data;
868 var_data = find_hist_vars(hist_data);
872 if (tracing_check_open_get_tr(tr))
875 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
881 var_data->hist_data = hist_data;
882 list_add(&var_data->list, &tr->hist_vars);
887 static void remove_hist_vars(struct hist_trigger_data *hist_data)
889 struct trace_array *tr = hist_data->event_file->tr;
890 struct hist_var_data *var_data;
892 var_data = find_hist_vars(hist_data);
896 if (WARN_ON(check_var_refs(hist_data)))
899 list_del(&var_data->list);
906 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
907 const char *var_name)
909 struct hist_field *hist_field, *found = NULL;
912 for_each_hist_field(i, hist_data) {
913 hist_field = hist_data->fields[i];
914 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
915 strcmp(hist_field->var.name, var_name) == 0) {
924 static struct hist_field *find_var(struct hist_trigger_data *hist_data,
925 struct trace_event_file *file,
926 const char *var_name)
928 struct hist_trigger_data *test_data;
929 struct event_trigger_data *test;
930 struct hist_field *hist_field;
932 lockdep_assert_held(&event_mutex);
934 hist_field = find_var_field(hist_data, var_name);
938 list_for_each_entry(test, &file->triggers, list) {
939 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
940 test_data = test->private_data;
941 hist_field = find_var_field(test_data, var_name);
950 static struct trace_event_file *find_var_file(struct trace_array *tr,
955 struct hist_trigger_data *var_hist_data;
956 struct hist_var_data *var_data;
957 struct trace_event_file *file, *found = NULL;
960 return find_event_file(tr, system, event_name);
962 list_for_each_entry(var_data, &tr->hist_vars, list) {
963 var_hist_data = var_data->hist_data;
964 file = var_hist_data->event_file;
968 if (find_var_field(var_hist_data, var_name)) {
970 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
981 static struct hist_field *find_file_var(struct trace_event_file *file,
982 const char *var_name)
984 struct hist_trigger_data *test_data;
985 struct event_trigger_data *test;
986 struct hist_field *hist_field;
988 lockdep_assert_held(&event_mutex);
990 list_for_each_entry(test, &file->triggers, list) {
991 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
992 test_data = test->private_data;
993 hist_field = find_var_field(test_data, var_name);
1002 static struct hist_field *
1003 find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1005 struct trace_array *tr = hist_data->event_file->tr;
1006 struct hist_field *hist_field, *found = NULL;
1007 struct trace_event_file *file;
1010 for (i = 0; i < hist_data->n_actions; i++) {
1011 struct action_data *data = hist_data->actions[i];
1013 if (data->handler == HANDLER_ONMATCH) {
1014 char *system = data->match_data.event_system;
1015 char *event_name = data->match_data.event;
1017 file = find_var_file(tr, system, event_name, var_name);
1020 hist_field = find_file_var(file, var_name);
1023 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1025 return ERR_PTR(-EINVAL);
1035 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1040 struct trace_array *tr = hist_data->event_file->tr;
1041 struct hist_field *hist_field = NULL;
1042 struct trace_event_file *file;
1044 if (!system || !event_name) {
1045 hist_field = find_match_var(hist_data, var_name);
1046 if (IS_ERR(hist_field))
1052 file = find_var_file(tr, system, event_name, var_name);
1056 hist_field = find_file_var(file, var_name);
1061 static u64 hist_field_var_ref(struct hist_field *hist_field,
1062 struct tracing_map_elt *elt,
1063 struct trace_buffer *buffer,
1064 struct ring_buffer_event *rbe,
1067 struct hist_elt_data *elt_data;
1070 if (WARN_ON_ONCE(!elt))
1073 elt_data = elt->private_data;
1074 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1079 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1080 u64 *var_ref_vals, bool self)
1082 struct hist_trigger_data *var_data;
1083 struct tracing_map_elt *var_elt;
1084 struct hist_field *hist_field;
1085 unsigned int i, var_idx;
1086 bool resolved = true;
1089 for (i = 0; i < hist_data->n_var_refs; i++) {
1090 hist_field = hist_data->var_refs[i];
1091 var_idx = hist_field->var.idx;
1092 var_data = hist_field->var.hist_data;
1094 if (var_data == NULL) {
1099 if ((self && var_data != hist_data) ||
1100 (!self && var_data == hist_data))
1103 var_elt = tracing_map_lookup(var_data->map, key);
1109 if (!tracing_map_var_set(var_elt, var_idx)) {
1114 if (self || !hist_field->read_once)
1115 var_val = tracing_map_read_var(var_elt, var_idx);
1117 var_val = tracing_map_read_var_once(var_elt, var_idx);
1119 var_ref_vals[i] = var_val;
1125 static const char *hist_field_name(struct hist_field *field,
1128 const char *field_name = "";
1134 field_name = field->field->name;
1135 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1136 field->flags & HIST_FIELD_FL_ALIAS ||
1137 field->flags & HIST_FIELD_FL_BUCKET)
1138 field_name = hist_field_name(field->operands[0], ++level);
1139 else if (field->flags & HIST_FIELD_FL_CPU)
1140 field_name = "common_cpu";
1141 else if (field->flags & HIST_FIELD_FL_EXPR ||
1142 field->flags & HIST_FIELD_FL_VAR_REF) {
1143 if (field->system) {
1144 static char full_name[MAX_FILTER_STR_VAL];
1146 strcat(full_name, field->system);
1147 strcat(full_name, ".");
1148 strcat(full_name, field->event_name);
1149 strcat(full_name, ".");
1150 strcat(full_name, field->name);
1151 field_name = full_name;
1153 field_name = field->name;
1154 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1155 field_name = "common_timestamp";
1157 if (field_name == NULL)
1163 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1165 hist_field_fn_t fn = NULL;
1167 switch (field_size) {
1169 if (field_is_signed)
1170 fn = hist_field_s64;
1172 fn = hist_field_u64;
1175 if (field_is_signed)
1176 fn = hist_field_s32;
1178 fn = hist_field_u32;
1181 if (field_is_signed)
1182 fn = hist_field_s16;
1184 fn = hist_field_u16;
1187 if (field_is_signed)
1197 static int parse_map_size(char *str)
1199 unsigned long size, map_bits;
1202 ret = kstrtoul(str, 0, &size);
1206 map_bits = ilog2(roundup_pow_of_two(size));
1207 if (map_bits < TRACING_MAP_BITS_MIN ||
1208 map_bits > TRACING_MAP_BITS_MAX)
1216 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1223 for (i = 0; i < attrs->n_assignments; i++)
1224 kfree(attrs->assignment_str[i]);
1226 for (i = 0; i < attrs->n_actions; i++)
1227 kfree(attrs->action_str[i]);
1230 kfree(attrs->sort_key_str);
1231 kfree(attrs->keys_str);
1232 kfree(attrs->vals_str);
1233 kfree(attrs->clock);
1237 static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1241 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1244 if ((str_has_prefix(str, "onmatch(")) ||
1245 (str_has_prefix(str, "onmax(")) ||
1246 (str_has_prefix(str, "onchange("))) {
1247 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1248 if (!attrs->action_str[attrs->n_actions]) {
1258 static int parse_assignment(struct trace_array *tr,
1259 char *str, struct hist_trigger_attrs *attrs)
1263 if ((len = str_has_prefix(str, "key=")) ||
1264 (len = str_has_prefix(str, "keys="))) {
1265 attrs->keys_str = kstrdup(str + len, GFP_KERNEL);
1266 if (!attrs->keys_str) {
1270 } else if ((len = str_has_prefix(str, "val=")) ||
1271 (len = str_has_prefix(str, "vals=")) ||
1272 (len = str_has_prefix(str, "values="))) {
1273 attrs->vals_str = kstrdup(str + len, GFP_KERNEL);
1274 if (!attrs->vals_str) {
1278 } else if ((len = str_has_prefix(str, "sort="))) {
1279 attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL);
1280 if (!attrs->sort_key_str) {
1284 } else if (str_has_prefix(str, "name=")) {
1285 attrs->name = kstrdup(str, GFP_KERNEL);
1290 } else if ((len = str_has_prefix(str, "clock="))) {
1293 str = strstrip(str);
1294 attrs->clock = kstrdup(str, GFP_KERNEL);
1295 if (!attrs->clock) {
1299 } else if ((len = str_has_prefix(str, "size="))) {
1300 int map_bits = parse_map_size(str + len);
1306 attrs->map_bits = map_bits;
1310 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
1311 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
1316 assignment = kstrdup(str, GFP_KERNEL);
1322 attrs->assignment_str[attrs->n_assignments++] = assignment;
1328 static struct hist_trigger_attrs *
1329 parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
1331 struct hist_trigger_attrs *attrs;
1334 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1336 return ERR_PTR(-ENOMEM);
1338 while (trigger_str) {
1339 char *str = strsep(&trigger_str, ":");
1342 rhs = strchr(str, '=');
1344 if (!strlen(++rhs)) {
1346 hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str));
1349 ret = parse_assignment(tr, str, attrs);
1352 } else if (strcmp(str, "pause") == 0)
1353 attrs->pause = true;
1354 else if ((strcmp(str, "cont") == 0) ||
1355 (strcmp(str, "continue") == 0))
1357 else if (strcmp(str, "clear") == 0)
1358 attrs->clear = true;
1360 ret = parse_action(str, attrs);
1366 if (!attrs->keys_str) {
1371 if (!attrs->clock) {
1372 attrs->clock = kstrdup("global", GFP_KERNEL);
1373 if (!attrs->clock) {
1381 destroy_hist_trigger_attrs(attrs);
1383 return ERR_PTR(ret);
1386 static inline void save_comm(char *comm, struct task_struct *task)
1389 strcpy(comm, "<idle>");
1393 if (WARN_ON_ONCE(task->pid < 0)) {
1394 strcpy(comm, "<XXX>");
1398 strncpy(comm, task->comm, TASK_COMM_LEN);
1401 static void hist_elt_data_free(struct hist_elt_data *elt_data)
1405 for (i = 0; i < elt_data->n_field_var_str; i++)
1406 kfree(elt_data->field_var_str[i]);
1408 kfree(elt_data->field_var_str);
1410 kfree(elt_data->comm);
1414 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
1416 struct hist_elt_data *elt_data = elt->private_data;
1418 hist_elt_data_free(elt_data);
1421 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
1423 struct hist_trigger_data *hist_data = elt->map->private_data;
1424 unsigned int size = TASK_COMM_LEN;
1425 struct hist_elt_data *elt_data;
1426 struct hist_field *hist_field;
1427 unsigned int i, n_str;
1429 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
1433 for_each_hist_field(i, hist_data) {
1434 hist_field = hist_data->fields[i];
1436 if (hist_field->flags & HIST_FIELD_FL_EXECNAME) {
1437 elt_data->comm = kzalloc(size, GFP_KERNEL);
1438 if (!elt_data->comm) {
1446 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str +
1447 hist_data->n_var_str;
1448 if (n_str > SYNTH_FIELDS_MAX) {
1449 hist_elt_data_free(elt_data);
1453 BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
1455 size = STR_VAR_LEN_MAX;
1457 elt_data->field_var_str = kcalloc(n_str, sizeof(char *), GFP_KERNEL);
1458 if (!elt_data->field_var_str) {
1459 hist_elt_data_free(elt_data);
1462 elt_data->n_field_var_str = n_str;
1464 for (i = 0; i < n_str; i++) {
1465 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
1466 if (!elt_data->field_var_str[i]) {
1467 hist_elt_data_free(elt_data);
1472 elt->private_data = elt_data;
1477 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
1479 struct hist_elt_data *elt_data = elt->private_data;
1482 save_comm(elt_data->comm, current);
1485 static const struct tracing_map_ops hist_trigger_elt_data_ops = {
1486 .elt_alloc = hist_trigger_elt_data_alloc,
1487 .elt_free = hist_trigger_elt_data_free,
1488 .elt_init = hist_trigger_elt_data_init,
1491 static const char *get_hist_field_flags(struct hist_field *hist_field)
1493 const char *flags_str = NULL;
1495 if (hist_field->flags & HIST_FIELD_FL_HEX)
1497 else if (hist_field->flags & HIST_FIELD_FL_SYM)
1499 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
1500 flags_str = "sym-offset";
1501 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
1502 flags_str = "execname";
1503 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
1504 flags_str = "syscall";
1505 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
1507 else if (hist_field->flags & HIST_FIELD_FL_BUCKET)
1508 flags_str = "buckets";
1509 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
1510 flags_str = "usecs";
1515 static void expr_field_str(struct hist_field *field, char *expr)
1517 if (field->flags & HIST_FIELD_FL_VAR_REF)
1520 strcat(expr, hist_field_name(field, 0));
1522 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
1523 const char *flags_str = get_hist_field_flags(field);
1527 strcat(expr, flags_str);
1532 static char *expr_str(struct hist_field *field, unsigned int level)
1539 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
1543 if (!field->operands[0]) {
1544 expr_field_str(field, expr);
1548 if (field->operator == FIELD_OP_UNARY_MINUS) {
1552 subexpr = expr_str(field->operands[0], ++level);
1557 strcat(expr, subexpr);
1565 expr_field_str(field->operands[0], expr);
1567 switch (field->operator) {
1568 case FIELD_OP_MINUS:
1579 expr_field_str(field->operands[1], expr);
1584 static int contains_operator(char *str)
1586 enum field_op_id field_op = FIELD_OP_NONE;
1589 op = strpbrk(str, "+-");
1591 return FIELD_OP_NONE;
1596 * Unfortunately, the modifier ".sym-offset"
1597 * can confuse things.
1599 if (op - str >= 4 && !strncmp(op - 4, ".sym-offset", 11))
1600 return FIELD_OP_NONE;
1603 field_op = FIELD_OP_UNARY_MINUS;
1605 field_op = FIELD_OP_MINUS;
1608 field_op = FIELD_OP_PLUS;
1617 static void get_hist_field(struct hist_field *hist_field)
1622 static void __destroy_hist_field(struct hist_field *hist_field)
1624 if (--hist_field->ref > 1)
1627 kfree(hist_field->var.name);
1628 kfree(hist_field->name);
1630 /* Can likely be a const */
1631 kfree_const(hist_field->type);
1633 kfree(hist_field->system);
1634 kfree(hist_field->event_name);
1639 static void destroy_hist_field(struct hist_field *hist_field,
1650 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
1651 return; /* var refs will be destroyed separately */
1653 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
1654 destroy_hist_field(hist_field->operands[i], level + 1);
1656 __destroy_hist_field(hist_field);
1659 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
1660 struct ftrace_event_field *field,
1661 unsigned long flags,
1664 struct hist_field *hist_field;
1666 if (field && is_function_field(field))
1669 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
1673 hist_field->ref = 1;
1675 hist_field->hist_data = hist_data;
1677 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
1678 goto out; /* caller will populate */
1680 if (flags & HIST_FIELD_FL_VAR_REF) {
1681 hist_field->fn = hist_field_var_ref;
1685 if (flags & HIST_FIELD_FL_HITCOUNT) {
1686 hist_field->fn = hist_field_counter;
1687 hist_field->size = sizeof(u64);
1688 hist_field->type = "u64";
1692 if (flags & HIST_FIELD_FL_STACKTRACE) {
1693 hist_field->fn = hist_field_none;
1697 if (flags & (HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET)) {
1698 unsigned long fl = flags & ~(HIST_FIELD_FL_LOG2 | HIST_FIELD_FL_BUCKET);
1699 hist_field->fn = flags & HIST_FIELD_FL_LOG2 ? hist_field_log2 :
1701 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
1702 hist_field->size = hist_field->operands[0]->size;
1703 hist_field->type = kstrdup_const(hist_field->operands[0]->type, GFP_KERNEL);
1704 if (!hist_field->type)
1709 if (flags & HIST_FIELD_FL_TIMESTAMP) {
1710 hist_field->fn = hist_field_timestamp;
1711 hist_field->size = sizeof(u64);
1712 hist_field->type = "u64";
1716 if (flags & HIST_FIELD_FL_CPU) {
1717 hist_field->fn = hist_field_cpu;
1718 hist_field->size = sizeof(int);
1719 hist_field->type = "unsigned int";
1723 if (WARN_ON_ONCE(!field))
1726 /* Pointers to strings are just pointers and dangerous to dereference */
1727 if (is_string_field(field) &&
1728 (field->filter_type != FILTER_PTR_STRING)) {
1729 flags |= HIST_FIELD_FL_STRING;
1731 hist_field->size = MAX_FILTER_STR_VAL;
1732 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
1733 if (!hist_field->type)
1736 if (field->filter_type == FILTER_STATIC_STRING)
1737 hist_field->fn = hist_field_string;
1738 else if (field->filter_type == FILTER_DYN_STRING)
1739 hist_field->fn = hist_field_dynstring;
1741 hist_field->fn = hist_field_pstring;
1743 hist_field->size = field->size;
1744 hist_field->is_signed = field->is_signed;
1745 hist_field->type = kstrdup_const(field->type, GFP_KERNEL);
1746 if (!hist_field->type)
1749 hist_field->fn = select_value_fn(field->size,
1751 if (!hist_field->fn) {
1752 destroy_hist_field(hist_field, 0);
1757 hist_field->field = field;
1758 hist_field->flags = flags;
1761 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
1762 if (!hist_field->var.name)
1768 destroy_hist_field(hist_field, 0);
1772 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
1776 for (i = 0; i < HIST_FIELDS_MAX; i++) {
1777 if (hist_data->fields[i]) {
1778 destroy_hist_field(hist_data->fields[i], 0);
1779 hist_data->fields[i] = NULL;
1783 for (i = 0; i < hist_data->n_var_refs; i++) {
1784 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
1785 __destroy_hist_field(hist_data->var_refs[i]);
1786 hist_data->var_refs[i] = NULL;
1790 static int init_var_ref(struct hist_field *ref_field,
1791 struct hist_field *var_field,
1792 char *system, char *event_name)
1796 ref_field->var.idx = var_field->var.idx;
1797 ref_field->var.hist_data = var_field->hist_data;
1798 ref_field->size = var_field->size;
1799 ref_field->is_signed = var_field->is_signed;
1800 ref_field->flags |= var_field->flags &
1801 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
1804 ref_field->system = kstrdup(system, GFP_KERNEL);
1805 if (!ref_field->system)
1810 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
1811 if (!ref_field->event_name) {
1817 if (var_field->var.name) {
1818 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
1819 if (!ref_field->name) {
1823 } else if (var_field->name) {
1824 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
1825 if (!ref_field->name) {
1831 ref_field->type = kstrdup_const(var_field->type, GFP_KERNEL);
1832 if (!ref_field->type) {
1839 kfree(ref_field->system);
1840 kfree(ref_field->event_name);
1841 kfree(ref_field->name);
1846 static int find_var_ref_idx(struct hist_trigger_data *hist_data,
1847 struct hist_field *var_field)
1849 struct hist_field *ref_field;
1852 for (i = 0; i < hist_data->n_var_refs; i++) {
1853 ref_field = hist_data->var_refs[i];
1854 if (ref_field->var.idx == var_field->var.idx &&
1855 ref_field->var.hist_data == var_field->hist_data)
1863 * create_var_ref - Create a variable reference and attach it to trigger
1864 * @hist_data: The trigger that will be referencing the variable
1865 * @var_field: The VAR field to create a reference to
1866 * @system: The optional system string
1867 * @event_name: The optional event_name string
1869 * Given a variable hist_field, create a VAR_REF hist_field that
1870 * represents a reference to it.
1872 * This function also adds the reference to the trigger that
1873 * now references the variable.
1875 * Return: The VAR_REF field if successful, NULL if not
1877 static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
1878 struct hist_field *var_field,
1879 char *system, char *event_name)
1881 unsigned long flags = HIST_FIELD_FL_VAR_REF;
1882 struct hist_field *ref_field;
1885 /* Check if the variable already exists */
1886 for (i = 0; i < hist_data->n_var_refs; i++) {
1887 ref_field = hist_data->var_refs[i];
1888 if (ref_field->var.idx == var_field->var.idx &&
1889 ref_field->var.hist_data == var_field->hist_data) {
1890 get_hist_field(ref_field);
1895 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
1897 if (init_var_ref(ref_field, var_field, system, event_name)) {
1898 destroy_hist_field(ref_field, 0);
1902 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
1903 ref_field->var_ref_idx = hist_data->n_var_refs++;
1909 static bool is_var_ref(char *var_name)
1911 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
1917 static char *field_name_from_var(struct hist_trigger_data *hist_data,
1923 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
1924 name = hist_data->attrs->var_defs.name[i];
1926 if (strcmp(var_name, name) == 0) {
1927 field = hist_data->attrs->var_defs.expr[i];
1928 if (contains_operator(field) || is_var_ref(field))
1937 static char *local_field_var_ref(struct hist_trigger_data *hist_data,
1938 char *system, char *event_name,
1941 struct trace_event_call *call;
1943 if (system && event_name) {
1944 call = hist_data->event_file->event_call;
1946 if (strcmp(system, call->class->system) != 0)
1949 if (strcmp(event_name, trace_event_name(call)) != 0)
1953 if (!!system != !!event_name)
1956 if (!is_var_ref(var_name))
1961 return field_name_from_var(hist_data, var_name);
1964 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
1965 char *system, char *event_name,
1968 struct hist_field *var_field = NULL, *ref_field = NULL;
1969 struct trace_array *tr = hist_data->event_file->tr;
1971 if (!is_var_ref(var_name))
1976 var_field = find_event_var(hist_data, system, event_name, var_name);
1978 ref_field = create_var_ref(hist_data, var_field,
1979 system, event_name);
1982 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
1987 static struct ftrace_event_field *
1988 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
1989 char *field_str, unsigned long *flags, unsigned long *buckets)
1991 struct ftrace_event_field *field = NULL;
1992 char *field_name, *modifier, *str;
1993 struct trace_array *tr = file->tr;
1995 modifier = str = kstrdup(field_str, GFP_KERNEL);
1997 return ERR_PTR(-ENOMEM);
1999 field_name = strsep(&modifier, ".");
2001 if (strcmp(modifier, "hex") == 0)
2002 *flags |= HIST_FIELD_FL_HEX;
2003 else if (strcmp(modifier, "sym") == 0)
2004 *flags |= HIST_FIELD_FL_SYM;
2005 else if (strcmp(modifier, "sym-offset") == 0)
2006 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2007 else if ((strcmp(modifier, "execname") == 0) &&
2008 (strcmp(field_name, "common_pid") == 0))
2009 *flags |= HIST_FIELD_FL_EXECNAME;
2010 else if (strcmp(modifier, "syscall") == 0)
2011 *flags |= HIST_FIELD_FL_SYSCALL;
2012 else if (strcmp(modifier, "log2") == 0)
2013 *flags |= HIST_FIELD_FL_LOG2;
2014 else if (strcmp(modifier, "usecs") == 0)
2015 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2016 else if (strncmp(modifier, "bucket", 6) == 0) {
2021 if (*modifier == 's')
2023 if (*modifier != '=')
2026 ret = kstrtoul(modifier, 0, buckets);
2027 if (ret || !(*buckets))
2029 *flags |= HIST_FIELD_FL_BUCKET;
2032 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
2033 field = ERR_PTR(-EINVAL);
2038 if (strcmp(field_name, "common_timestamp") == 0) {
2039 *flags |= HIST_FIELD_FL_TIMESTAMP;
2040 hist_data->enable_timestamps = true;
2041 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2042 hist_data->attrs->ts_in_usecs = true;
2043 } else if (strcmp(field_name, "common_cpu") == 0)
2044 *flags |= HIST_FIELD_FL_CPU;
2046 field = trace_find_event_field(file->event_call, field_name);
2047 if (!field || !field->size) {
2049 * For backward compatibility, if field_name
2050 * was "cpu", then we treat this the same as
2053 if (strcmp(field_name, "cpu") == 0) {
2054 *flags |= HIST_FIELD_FL_CPU;
2056 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND,
2057 errpos(field_name));
2058 field = ERR_PTR(-EINVAL);
2069 static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2070 struct hist_field *var_ref,
2073 struct hist_field *alias = NULL;
2074 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2076 alias = create_hist_field(hist_data, NULL, flags, var_name);
2080 alias->fn = var_ref->fn;
2081 alias->operands[0] = var_ref;
2083 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2084 destroy_hist_field(alias, 0);
2088 alias->var_ref_idx = var_ref->var_ref_idx;
2093 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2094 struct trace_event_file *file, char *str,
2095 unsigned long *flags, char *var_name)
2097 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
2098 struct ftrace_event_field *field = NULL;
2099 struct hist_field *hist_field = NULL;
2100 unsigned long buckets = 0;
2103 s = strchr(str, '.');
2105 s = strchr(++s, '.');
2107 ref_system = strsep(&str, ".");
2112 ref_event = strsep(&str, ".");
2121 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2123 hist_field = parse_var_ref(hist_data, ref_system,
2124 ref_event, ref_var);
2127 hist_field = create_alias(hist_data, hist_field, var_name);
2138 field = parse_field(hist_data, file, str, flags, &buckets);
2139 if (IS_ERR(field)) {
2140 ret = PTR_ERR(field);
2144 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2149 hist_field->buckets = buckets;
2153 return ERR_PTR(ret);
2156 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2157 struct trace_event_file *file,
2158 char *str, unsigned long flags,
2159 char *var_name, unsigned int level);
2161 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2162 struct trace_event_file *file,
2163 char *str, unsigned long flags,
2164 char *var_name, unsigned int level)
2166 struct hist_field *operand1, *expr = NULL;
2167 unsigned long operand_flags;
2171 /* we support only -(xxx) i.e. explicit parens required */
2174 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2179 str++; /* skip leading '-' */
2181 s = strchr(str, '(');
2189 s = strrchr(str, ')');
2193 ret = -EINVAL; /* no closing ')' */
2197 flags |= HIST_FIELD_FL_EXPR;
2198 expr = create_hist_field(hist_data, NULL, flags, var_name);
2205 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2206 if (IS_ERR(operand1)) {
2207 ret = PTR_ERR(operand1);
2210 if (operand1->flags & HIST_FIELD_FL_STRING) {
2211 /* String type can not be the operand of unary operator. */
2212 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2213 destroy_hist_field(operand1, 0);
2218 expr->flags |= operand1->flags &
2219 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2220 expr->fn = hist_field_unary_minus;
2221 expr->operands[0] = operand1;
2222 expr->operator = FIELD_OP_UNARY_MINUS;
2223 expr->name = expr_str(expr, 0);
2224 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
2232 destroy_hist_field(expr, 0);
2233 return ERR_PTR(ret);
2236 static int check_expr_operands(struct trace_array *tr,
2237 struct hist_field *operand1,
2238 struct hist_field *operand2)
2240 unsigned long operand1_flags = operand1->flags;
2241 unsigned long operand2_flags = operand2->flags;
2243 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2244 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2245 struct hist_field *var;
2247 var = find_var_field(operand1->var.hist_data, operand1->name);
2250 operand1_flags = var->flags;
2253 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2254 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2255 struct hist_field *var;
2257 var = find_var_field(operand2->var.hist_data, operand2->name);
2260 operand2_flags = var->flags;
2263 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
2264 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
2265 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
2272 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2273 struct trace_event_file *file,
2274 char *str, unsigned long flags,
2275 char *var_name, unsigned int level)
2277 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2278 unsigned long operand_flags;
2279 int field_op, ret = -EINVAL;
2280 char *sep, *operand1_str;
2283 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2284 return ERR_PTR(-EINVAL);
2287 field_op = contains_operator(str);
2289 if (field_op == FIELD_OP_NONE)
2290 return parse_atom(hist_data, file, str, &flags, var_name);
2292 if (field_op == FIELD_OP_UNARY_MINUS)
2293 return parse_unary(hist_data, file, str, flags, var_name, ++level);
2296 case FIELD_OP_MINUS:
2306 operand1_str = strsep(&str, sep);
2307 if (!operand1_str || !str)
2311 operand1 = parse_atom(hist_data, file, operand1_str,
2312 &operand_flags, NULL);
2313 if (IS_ERR(operand1)) {
2314 ret = PTR_ERR(operand1);
2318 if (operand1->flags & HIST_FIELD_FL_STRING) {
2319 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str));
2324 /* rest of string could be another expression e.g. b+c in a+b+c */
2326 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2327 if (IS_ERR(operand2)) {
2328 ret = PTR_ERR(operand2);
2332 if (operand2->flags & HIST_FIELD_FL_STRING) {
2333 hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
2338 ret = check_expr_operands(file->tr, operand1, operand2);
2342 flags |= HIST_FIELD_FL_EXPR;
2344 flags |= operand1->flags &
2345 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2347 expr = create_hist_field(hist_data, NULL, flags, var_name);
2353 operand1->read_once = true;
2354 operand2->read_once = true;
2356 expr->operands[0] = operand1;
2357 expr->operands[1] = operand2;
2359 /* The operand sizes should be the same, so just pick one */
2360 expr->size = operand1->size;
2362 expr->operator = field_op;
2363 expr->name = expr_str(expr, 0);
2364 expr->type = kstrdup_const(operand1->type, GFP_KERNEL);
2371 case FIELD_OP_MINUS:
2372 expr->fn = hist_field_minus;
2375 expr->fn = hist_field_plus;
2384 destroy_hist_field(operand1, 0);
2385 destroy_hist_field(operand2, 0);
2386 destroy_hist_field(expr, 0);
2388 return ERR_PTR(ret);
2391 static char *find_trigger_filter(struct hist_trigger_data *hist_data,
2392 struct trace_event_file *file)
2394 struct event_trigger_data *test;
2396 lockdep_assert_held(&event_mutex);
2398 list_for_each_entry(test, &file->triggers, list) {
2399 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2400 if (test->private_data == hist_data)
2401 return test->filter_str;
2408 static struct event_command trigger_hist_cmd;
2409 static int event_hist_trigger_func(struct event_command *cmd_ops,
2410 struct trace_event_file *file,
2411 char *glob, char *cmd, char *param);
2413 static bool compatible_keys(struct hist_trigger_data *target_hist_data,
2414 struct hist_trigger_data *hist_data,
2415 unsigned int n_keys)
2417 struct hist_field *target_hist_field, *hist_field;
2418 unsigned int n, i, j;
2420 if (hist_data->n_fields - hist_data->n_vals != n_keys)
2423 i = hist_data->n_vals;
2424 j = target_hist_data->n_vals;
2426 for (n = 0; n < n_keys; n++) {
2427 hist_field = hist_data->fields[i + n];
2428 target_hist_field = target_hist_data->fields[j + n];
2430 if (strcmp(hist_field->type, target_hist_field->type) != 0)
2432 if (hist_field->size != target_hist_field->size)
2434 if (hist_field->is_signed != target_hist_field->is_signed)
2441 static struct hist_trigger_data *
2442 find_compatible_hist(struct hist_trigger_data *target_hist_data,
2443 struct trace_event_file *file)
2445 struct hist_trigger_data *hist_data;
2446 struct event_trigger_data *test;
2447 unsigned int n_keys;
2449 lockdep_assert_held(&event_mutex);
2451 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
2453 list_for_each_entry(test, &file->triggers, list) {
2454 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2455 hist_data = test->private_data;
2457 if (compatible_keys(target_hist_data, hist_data, n_keys))
2465 static struct trace_event_file *event_file(struct trace_array *tr,
2466 char *system, char *event_name)
2468 struct trace_event_file *file;
2470 file = __find_event_file(tr, system, event_name);
2472 return ERR_PTR(-EINVAL);
2477 static struct hist_field *
2478 find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
2479 char *system, char *event_name, char *field_name)
2481 struct hist_field *event_var;
2482 char *synthetic_name;
2484 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2485 if (!synthetic_name)
2486 return ERR_PTR(-ENOMEM);
2488 strcpy(synthetic_name, "synthetic_");
2489 strcat(synthetic_name, field_name);
2491 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
2493 kfree(synthetic_name);
2499 * create_field_var_hist - Automatically create a histogram and var for a field
2500 * @target_hist_data: The target hist trigger
2501 * @subsys_name: Optional subsystem name
2502 * @event_name: Optional event name
2503 * @field_name: The name of the field (and the resulting variable)
2505 * Hist trigger actions fetch data from variables, not directly from
2506 * events. However, for convenience, users are allowed to directly
2507 * specify an event field in an action, which will be automatically
2508 * converted into a variable on their behalf.
2510 * If a user specifies a field on an event that isn't the event the
2511 * histogram currently being defined (the target event histogram), the
2512 * only way that can be accomplished is if a new hist trigger is
2513 * created and the field variable defined on that.
2515 * This function creates a new histogram compatible with the target
2516 * event (meaning a histogram with the same key as the target
2517 * histogram), and creates a variable for the specified field, but
2518 * with 'synthetic_' prepended to the variable name in order to avoid
2519 * collision with normal field variables.
2521 * Return: The variable created for the field.
2523 static struct hist_field *
2524 create_field_var_hist(struct hist_trigger_data *target_hist_data,
2525 char *subsys_name, char *event_name, char *field_name)
2527 struct trace_array *tr = target_hist_data->event_file->tr;
2528 struct hist_trigger_data *hist_data;
2529 unsigned int i, n, first = true;
2530 struct field_var_hist *var_hist;
2531 struct trace_event_file *file;
2532 struct hist_field *key_field;
2533 struct hist_field *event_var;
2538 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
2539 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
2540 return ERR_PTR(-EINVAL);
2543 file = event_file(tr, subsys_name, event_name);
2546 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
2547 ret = PTR_ERR(file);
2548 return ERR_PTR(ret);
2552 * Look for a histogram compatible with target. We'll use the
2553 * found histogram specification to create a new matching
2554 * histogram with our variable on it. target_hist_data is not
2555 * yet a registered histogram so we can't use that.
2557 hist_data = find_compatible_hist(target_hist_data, file);
2559 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
2560 return ERR_PTR(-EINVAL);
2563 /* See if a synthetic field variable has already been created */
2564 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2565 event_name, field_name);
2566 if (!IS_ERR_OR_NULL(event_var))
2569 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
2571 return ERR_PTR(-ENOMEM);
2573 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2576 return ERR_PTR(-ENOMEM);
2579 /* Use the same keys as the compatible histogram */
2580 strcat(cmd, "keys=");
2582 for_each_hist_key_field(i, hist_data) {
2583 key_field = hist_data->fields[i];
2586 strcat(cmd, key_field->field->name);
2590 /* Create the synthetic field variable specification */
2591 strcat(cmd, ":synthetic_");
2592 strcat(cmd, field_name);
2594 strcat(cmd, field_name);
2596 /* Use the same filter as the compatible histogram */
2597 saved_filter = find_trigger_filter(hist_data, file);
2599 strcat(cmd, " if ");
2600 strcat(cmd, saved_filter);
2603 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
2604 if (!var_hist->cmd) {
2607 return ERR_PTR(-ENOMEM);
2610 /* Save the compatible histogram information */
2611 var_hist->hist_data = hist_data;
2613 /* Create the new histogram with our variable */
2614 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
2618 kfree(var_hist->cmd);
2620 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
2621 return ERR_PTR(ret);
2626 /* If we can't find the variable, something went wrong */
2627 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2628 event_name, field_name);
2629 if (IS_ERR_OR_NULL(event_var)) {
2630 kfree(var_hist->cmd);
2632 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
2633 return ERR_PTR(-EINVAL);
2636 n = target_hist_data->n_field_var_hists;
2637 target_hist_data->field_var_hists[n] = var_hist;
2638 target_hist_data->n_field_var_hists++;
2643 static struct hist_field *
2644 find_target_event_var(struct hist_trigger_data *hist_data,
2645 char *subsys_name, char *event_name, char *var_name)
2647 struct trace_event_file *file = hist_data->event_file;
2648 struct hist_field *hist_field = NULL;
2651 struct trace_event_call *call;
2656 call = file->event_call;
2658 if (strcmp(subsys_name, call->class->system) != 0)
2661 if (strcmp(event_name, trace_event_name(call)) != 0)
2665 hist_field = find_var_field(hist_data, var_name);
2670 static inline void __update_field_vars(struct tracing_map_elt *elt,
2671 struct trace_buffer *buffer,
2672 struct ring_buffer_event *rbe,
2674 struct field_var **field_vars,
2675 unsigned int n_field_vars,
2676 unsigned int field_var_str_start)
2678 struct hist_elt_data *elt_data = elt->private_data;
2679 unsigned int i, j, var_idx;
2682 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
2683 struct field_var *field_var = field_vars[i];
2684 struct hist_field *var = field_var->var;
2685 struct hist_field *val = field_var->val;
2687 var_val = val->fn(val, elt, buffer, rbe, rec);
2688 var_idx = var->var.idx;
2690 if (val->flags & HIST_FIELD_FL_STRING) {
2691 char *str = elt_data->field_var_str[j++];
2692 char *val_str = (char *)(uintptr_t)var_val;
2694 strscpy(str, val_str, STR_VAR_LEN_MAX);
2695 var_val = (u64)(uintptr_t)str;
2697 tracing_map_set_var(elt, var_idx, var_val);
2701 static void update_field_vars(struct hist_trigger_data *hist_data,
2702 struct tracing_map_elt *elt,
2703 struct trace_buffer *buffer,
2704 struct ring_buffer_event *rbe,
2707 __update_field_vars(elt, buffer, rbe, rec, hist_data->field_vars,
2708 hist_data->n_field_vars, 0);
2711 static void save_track_data_vars(struct hist_trigger_data *hist_data,
2712 struct tracing_map_elt *elt,
2713 struct trace_buffer *buffer, void *rec,
2714 struct ring_buffer_event *rbe, void *key,
2715 struct action_data *data, u64 *var_ref_vals)
2717 __update_field_vars(elt, buffer, rbe, rec, hist_data->save_vars,
2718 hist_data->n_save_vars, hist_data->n_field_var_str);
2721 static struct hist_field *create_var(struct hist_trigger_data *hist_data,
2722 struct trace_event_file *file,
2723 char *name, int size, const char *type)
2725 struct hist_field *var;
2728 if (find_var(hist_data, file, name) && !hist_data->remove) {
2729 var = ERR_PTR(-EINVAL);
2733 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2735 var = ERR_PTR(-ENOMEM);
2739 idx = tracing_map_add_var(hist_data->map);
2742 var = ERR_PTR(-EINVAL);
2747 var->flags = HIST_FIELD_FL_VAR;
2749 var->var.hist_data = var->hist_data = hist_data;
2751 var->var.name = kstrdup(name, GFP_KERNEL);
2752 var->type = kstrdup_const(type, GFP_KERNEL);
2753 if (!var->var.name || !var->type) {
2754 kfree_const(var->type);
2755 kfree(var->var.name);
2757 var = ERR_PTR(-ENOMEM);
2763 static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
2764 struct trace_event_file *file,
2767 struct hist_field *val = NULL, *var = NULL;
2768 unsigned long flags = HIST_FIELD_FL_VAR;
2769 struct trace_array *tr = file->tr;
2770 struct field_var *field_var;
2773 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
2774 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
2779 val = parse_atom(hist_data, file, field_name, &flags, NULL);
2781 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
2786 var = create_var(hist_data, file, field_name, val->size, val->type);
2788 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
2794 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
2802 field_var->var = var;
2803 field_var->val = val;
2807 field_var = ERR_PTR(ret);
2812 * create_target_field_var - Automatically create a variable for a field
2813 * @target_hist_data: The target hist trigger
2814 * @subsys_name: Optional subsystem name
2815 * @event_name: Optional event name
2816 * @var_name: The name of the field (and the resulting variable)
2818 * Hist trigger actions fetch data from variables, not directly from
2819 * events. However, for convenience, users are allowed to directly
2820 * specify an event field in an action, which will be automatically
2821 * converted into a variable on their behalf.
2823 * This function creates a field variable with the name var_name on
2824 * the hist trigger currently being defined on the target event. If
2825 * subsys_name and event_name are specified, this function simply
2826 * verifies that they do in fact match the target event subsystem and
2829 * Return: The variable created for the field.
2831 static struct field_var *
2832 create_target_field_var(struct hist_trigger_data *target_hist_data,
2833 char *subsys_name, char *event_name, char *var_name)
2835 struct trace_event_file *file = target_hist_data->event_file;
2838 struct trace_event_call *call;
2843 call = file->event_call;
2845 if (strcmp(subsys_name, call->class->system) != 0)
2848 if (strcmp(event_name, trace_event_name(call)) != 0)
2852 return create_field_var(target_hist_data, file, var_name);
2855 static bool check_track_val_max(u64 track_val, u64 var_val)
2857 if (var_val <= track_val)
2863 static bool check_track_val_changed(u64 track_val, u64 var_val)
2865 if (var_val == track_val)
2871 static u64 get_track_val(struct hist_trigger_data *hist_data,
2872 struct tracing_map_elt *elt,
2873 struct action_data *data)
2875 unsigned int track_var_idx = data->track_data.track_var->var.idx;
2878 track_val = tracing_map_read_var(elt, track_var_idx);
2883 static void save_track_val(struct hist_trigger_data *hist_data,
2884 struct tracing_map_elt *elt,
2885 struct action_data *data, u64 var_val)
2887 unsigned int track_var_idx = data->track_data.track_var->var.idx;
2889 tracing_map_set_var(elt, track_var_idx, var_val);
2892 static void save_track_data(struct hist_trigger_data *hist_data,
2893 struct tracing_map_elt *elt,
2894 struct trace_buffer *buffer, void *rec,
2895 struct ring_buffer_event *rbe, void *key,
2896 struct action_data *data, u64 *var_ref_vals)
2898 if (data->track_data.save_data)
2899 data->track_data.save_data(hist_data, elt, buffer, rec, rbe,
2900 key, data, var_ref_vals);
2903 static bool check_track_val(struct tracing_map_elt *elt,
2904 struct action_data *data,
2907 struct hist_trigger_data *hist_data;
2910 hist_data = data->track_data.track_var->hist_data;
2911 track_val = get_track_val(hist_data, elt, data);
2913 return data->track_data.check_val(track_val, var_val);
2916 #ifdef CONFIG_TRACER_SNAPSHOT
2917 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
2919 /* called with tr->max_lock held */
2920 struct track_data *track_data = tr->cond_snapshot->cond_data;
2921 struct hist_elt_data *elt_data, *track_elt_data;
2922 struct snapshot_context *context = cond_data;
2923 struct action_data *action;
2929 action = track_data->action_data;
2931 track_val = get_track_val(track_data->hist_data, context->elt,
2932 track_data->action_data);
2934 if (!action->track_data.check_val(track_data->track_val, track_val))
2937 track_data->track_val = track_val;
2938 memcpy(track_data->key, context->key, track_data->key_len);
2940 elt_data = context->elt->private_data;
2941 track_elt_data = track_data->elt.private_data;
2943 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
2945 track_data->updated = true;
2950 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
2951 struct tracing_map_elt *elt,
2952 struct trace_buffer *buffer, void *rec,
2953 struct ring_buffer_event *rbe, void *key,
2954 struct action_data *data,
2957 struct trace_event_file *file = hist_data->event_file;
2958 struct snapshot_context context;
2963 tracing_snapshot_cond(file->tr, &context);
2966 static void hist_trigger_print_key(struct seq_file *m,
2967 struct hist_trigger_data *hist_data,
2969 struct tracing_map_elt *elt);
2971 static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
2975 if (!hist_data->n_actions)
2978 for (i = 0; i < hist_data->n_actions; i++) {
2979 struct action_data *data = hist_data->actions[i];
2981 if (data->action == ACTION_SNAPSHOT)
2988 static void track_data_snapshot_print(struct seq_file *m,
2989 struct hist_trigger_data *hist_data)
2991 struct trace_event_file *file = hist_data->event_file;
2992 struct track_data *track_data;
2993 struct action_data *action;
2995 track_data = tracing_cond_snapshot_data(file->tr);
2999 if (!track_data->updated)
3002 action = snapshot_action(hist_data);
3006 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3007 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3008 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3009 action->track_data.var_str, track_data->track_val);
3011 seq_puts(m, "\ttriggered by event with key: ");
3012 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3016 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3020 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3021 struct tracing_map_elt *elt,
3022 struct trace_buffer *buffer, void *rec,
3023 struct ring_buffer_event *rbe, void *key,
3024 struct action_data *data,
3025 u64 *var_ref_vals) {}
3026 static void track_data_snapshot_print(struct seq_file *m,
3027 struct hist_trigger_data *hist_data) {}
3028 #endif /* CONFIG_TRACER_SNAPSHOT */
3030 static void track_data_print(struct seq_file *m,
3031 struct hist_trigger_data *hist_data,
3032 struct tracing_map_elt *elt,
3033 struct action_data *data)
3035 u64 track_val = get_track_val(hist_data, elt, data);
3036 unsigned int i, save_var_idx;
3038 if (data->handler == HANDLER_ONMAX)
3039 seq_printf(m, "\n\tmax: %10llu", track_val);
3040 else if (data->handler == HANDLER_ONCHANGE)
3041 seq_printf(m, "\n\tchanged: %10llu", track_val);
3043 if (data->action == ACTION_SNAPSHOT)
3046 for (i = 0; i < hist_data->n_save_vars; i++) {
3047 struct hist_field *save_val = hist_data->save_vars[i]->val;
3048 struct hist_field *save_var = hist_data->save_vars[i]->var;
3051 save_var_idx = save_var->var.idx;
3053 val = tracing_map_read_var(elt, save_var_idx);
3055 if (save_val->flags & HIST_FIELD_FL_STRING) {
3056 seq_printf(m, " %s: %-32s", save_var->var.name,
3057 (char *)(uintptr_t)(val));
3059 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3063 static void ontrack_action(struct hist_trigger_data *hist_data,
3064 struct tracing_map_elt *elt,
3065 struct trace_buffer *buffer, void *rec,
3066 struct ring_buffer_event *rbe, void *key,
3067 struct action_data *data, u64 *var_ref_vals)
3069 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
3071 if (check_track_val(elt, data, var_val)) {
3072 save_track_val(hist_data, elt, data, var_val);
3073 save_track_data(hist_data, elt, buffer, rec, rbe,
3074 key, data, var_ref_vals);
3078 static void action_data_destroy(struct action_data *data)
3082 lockdep_assert_held(&event_mutex);
3084 kfree(data->action_name);
3086 for (i = 0; i < data->n_params; i++)
3087 kfree(data->params[i]);
3089 if (data->synth_event)
3090 data->synth_event->ref--;
3092 kfree(data->synth_event_name);
3097 static void track_data_destroy(struct hist_trigger_data *hist_data,
3098 struct action_data *data)
3100 struct trace_event_file *file = hist_data->event_file;
3102 destroy_hist_field(data->track_data.track_var, 0);
3104 if (data->action == ACTION_SNAPSHOT) {
3105 struct track_data *track_data;
3107 track_data = tracing_cond_snapshot_data(file->tr);
3108 if (track_data && track_data->hist_data == hist_data) {
3109 tracing_snapshot_cond_disable(file->tr);
3110 track_data_free(track_data);
3114 kfree(data->track_data.var_str);
3116 action_data_destroy(data);
3119 static int action_create(struct hist_trigger_data *hist_data,
3120 struct action_data *data);
3122 static int track_data_create(struct hist_trigger_data *hist_data,
3123 struct action_data *data)
3125 struct hist_field *var_field, *ref_field, *track_var = NULL;
3126 struct trace_event_file *file = hist_data->event_file;
3127 struct trace_array *tr = file->tr;
3128 char *track_data_var_str;
3131 track_data_var_str = data->track_data.var_str;
3132 if (track_data_var_str[0] != '$') {
3133 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
3136 track_data_var_str++;
3138 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
3140 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
3144 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
3148 data->track_data.var_ref = ref_field;
3150 if (data->handler == HANDLER_ONMAX)
3151 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3152 if (IS_ERR(track_var)) {
3153 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3154 ret = PTR_ERR(track_var);
3158 if (data->handler == HANDLER_ONCHANGE)
3159 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3160 if (IS_ERR(track_var)) {
3161 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3162 ret = PTR_ERR(track_var);
3165 data->track_data.track_var = track_var;
3167 ret = action_create(hist_data, data);
3172 static int parse_action_params(struct trace_array *tr, char *params,
3173 struct action_data *data)
3175 char *param, *saved_param;
3176 bool first_param = true;
3180 if (data->n_params >= SYNTH_FIELDS_MAX) {
3181 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
3185 param = strsep(¶ms, ",");
3187 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
3192 param = strstrip(param);
3193 if (strlen(param) < 2) {
3194 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
3199 saved_param = kstrdup(param, GFP_KERNEL);
3205 if (first_param && data->use_trace_keyword) {
3206 data->synth_event_name = saved_param;
3207 first_param = false;
3210 first_param = false;
3212 data->params[data->n_params++] = saved_param;
3218 static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
3219 enum handler_id handler)
3226 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3231 action_name = strsep(&str, "(");
3232 if (!action_name || !str) {
3233 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3238 if (str_has_prefix(action_name, "save")) {
3239 char *params = strsep(&str, ")");
3242 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
3247 ret = parse_action_params(tr, params, data);
3251 if (handler == HANDLER_ONMAX)
3252 data->track_data.check_val = check_track_val_max;
3253 else if (handler == HANDLER_ONCHANGE)
3254 data->track_data.check_val = check_track_val_changed;
3256 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3261 data->track_data.save_data = save_track_data_vars;
3262 data->fn = ontrack_action;
3263 data->action = ACTION_SAVE;
3264 } else if (str_has_prefix(action_name, "snapshot")) {
3265 char *params = strsep(&str, ")");
3268 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
3273 if (handler == HANDLER_ONMAX)
3274 data->track_data.check_val = check_track_val_max;
3275 else if (handler == HANDLER_ONCHANGE)
3276 data->track_data.check_val = check_track_val_changed;
3278 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3283 data->track_data.save_data = save_track_data_snapshot;
3284 data->fn = ontrack_action;
3285 data->action = ACTION_SNAPSHOT;
3287 char *params = strsep(&str, ")");
3289 if (str_has_prefix(action_name, "trace"))
3290 data->use_trace_keyword = true;
3293 ret = parse_action_params(tr, params, data);
3298 if (handler == HANDLER_ONMAX)
3299 data->track_data.check_val = check_track_val_max;
3300 else if (handler == HANDLER_ONCHANGE)
3301 data->track_data.check_val = check_track_val_changed;
3303 if (handler != HANDLER_ONMATCH) {
3304 data->track_data.save_data = action_trace;
3305 data->fn = ontrack_action;
3307 data->fn = action_trace;
3309 data->action = ACTION_TRACE;
3312 data->action_name = kstrdup(action_name, GFP_KERNEL);
3313 if (!data->action_name) {
3318 data->handler = handler;
3323 static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
3324 char *str, enum handler_id handler)
3326 struct action_data *data;
3330 data = kzalloc(sizeof(*data), GFP_KERNEL);
3332 return ERR_PTR(-ENOMEM);
3334 var_str = strsep(&str, ")");
3335 if (!var_str || !str) {
3340 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
3341 if (!data->track_data.var_str) {
3346 ret = action_parse(hist_data->event_file->tr, str, data, handler);
3352 track_data_destroy(hist_data, data);
3353 data = ERR_PTR(ret);
3357 static void onmatch_destroy(struct action_data *data)
3359 kfree(data->match_data.event);
3360 kfree(data->match_data.event_system);
3362 action_data_destroy(data);
3365 static void destroy_field_var(struct field_var *field_var)
3370 destroy_hist_field(field_var->var, 0);
3371 destroy_hist_field(field_var->val, 0);
3376 static void destroy_field_vars(struct hist_trigger_data *hist_data)
3380 for (i = 0; i < hist_data->n_field_vars; i++)
3381 destroy_field_var(hist_data->field_vars[i]);
3383 for (i = 0; i < hist_data->n_save_vars; i++)
3384 destroy_field_var(hist_data->save_vars[i]);
3387 static void save_field_var(struct hist_trigger_data *hist_data,
3388 struct field_var *field_var)
3390 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3392 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3393 hist_data->n_field_var_str++;
3397 static int check_synth_field(struct synth_event *event,
3398 struct hist_field *hist_field,
3399 unsigned int field_pos)
3401 struct synth_field *field;
3403 if (field_pos >= event->n_fields)
3406 field = event->fields[field_pos];
3409 * A dynamic string synth field can accept static or
3410 * dynamic. A static string synth field can only accept a
3411 * same-sized static string, which is checked for later.
3413 if (strstr(hist_field->type, "char[") && field->is_string
3414 && field->is_dynamic)
3417 if (strcmp(field->type, hist_field->type) != 0) {
3418 if (field->size != hist_field->size ||
3419 field->is_signed != hist_field->is_signed)
3426 static struct hist_field *
3427 trace_action_find_var(struct hist_trigger_data *hist_data,
3428 struct action_data *data,
3429 char *system, char *event, char *var)
3431 struct trace_array *tr = hist_data->event_file->tr;
3432 struct hist_field *hist_field;
3434 var++; /* skip '$' */
3436 hist_field = find_target_event_var(hist_data, system, event, var);
3438 if (!system && data->handler == HANDLER_ONMATCH) {
3439 system = data->match_data.event_system;
3440 event = data->match_data.event;
3443 hist_field = find_event_var(hist_data, system, event, var);
3447 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
3452 static struct hist_field *
3453 trace_action_create_field_var(struct hist_trigger_data *hist_data,
3454 struct action_data *data, char *system,
3455 char *event, char *var)
3457 struct hist_field *hist_field = NULL;
3458 struct field_var *field_var;
3461 * First try to create a field var on the target event (the
3462 * currently being defined). This will create a variable for
3463 * unqualified fields on the target event, or if qualified,
3464 * target fields that have qualified names matching the target.
3466 field_var = create_target_field_var(hist_data, system, event, var);
3468 if (field_var && !IS_ERR(field_var)) {
3469 save_field_var(hist_data, field_var);
3470 hist_field = field_var->var;
3474 * If no explicit system.event is specified, default to
3475 * looking for fields on the onmatch(system.event.xxx)
3478 if (!system && data->handler == HANDLER_ONMATCH) {
3479 system = data->match_data.event_system;
3480 event = data->match_data.event;
3486 * At this point, we're looking at a field on another
3487 * event. Because we can't modify a hist trigger on
3488 * another event to add a variable for a field, we need
3489 * to create a new trigger on that event and create the
3490 * variable at the same time.
3492 hist_field = create_field_var_hist(hist_data, system, event, var);
3493 if (IS_ERR(hist_field))
3499 destroy_field_var(field_var);
3504 static int trace_action_create(struct hist_trigger_data *hist_data,
3505 struct action_data *data)
3507 struct trace_array *tr = hist_data->event_file->tr;
3508 char *event_name, *param, *system = NULL;
3509 struct hist_field *hist_field, *var_ref;
3511 unsigned int field_pos = 0;
3512 struct synth_event *event;
3513 char *synth_event_name;
3514 int var_ref_idx, ret = 0;
3516 lockdep_assert_held(&event_mutex);
3518 if (data->use_trace_keyword)
3519 synth_event_name = data->synth_event_name;
3521 synth_event_name = data->action_name;
3523 event = find_synth_event(synth_event_name);
3525 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
3531 for (i = 0; i < data->n_params; i++) {
3534 p = param = kstrdup(data->params[i], GFP_KERNEL);
3540 system = strsep(¶m, ".");
3542 param = (char *)system;
3543 system = event_name = NULL;
3545 event_name = strsep(¶m, ".");
3553 if (param[0] == '$')
3554 hist_field = trace_action_find_var(hist_data, data,
3558 hist_field = trace_action_create_field_var(hist_data,
3570 if (check_synth_field(event, hist_field, field_pos) == 0) {
3571 var_ref = create_var_ref(hist_data, hist_field,
3572 system, event_name);
3579 var_ref_idx = find_var_ref_idx(hist_data, var_ref);
3580 if (WARN_ON(var_ref_idx < 0)) {
3585 data->var_ref_idx[i] = var_ref_idx;
3592 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
3598 if (field_pos != event->n_fields) {
3599 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
3604 data->synth_event = event;
3613 static int action_create(struct hist_trigger_data *hist_data,
3614 struct action_data *data)
3616 struct trace_event_file *file = hist_data->event_file;
3617 struct trace_array *tr = file->tr;
3618 struct track_data *track_data;
3619 struct field_var *field_var;
3624 if (data->action == ACTION_TRACE)
3625 return trace_action_create(hist_data, data);
3627 if (data->action == ACTION_SNAPSHOT) {
3628 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
3629 if (IS_ERR(track_data)) {
3630 ret = PTR_ERR(track_data);
3634 ret = tracing_snapshot_cond_enable(file->tr, track_data,
3635 cond_snapshot_update);
3637 track_data_free(track_data);
3642 if (data->action == ACTION_SAVE) {
3643 if (hist_data->n_save_vars) {
3645 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
3649 for (i = 0; i < data->n_params; i++) {
3650 param = kstrdup(data->params[i], GFP_KERNEL);
3656 field_var = create_target_field_var(hist_data, NULL, NULL, param);
3657 if (IS_ERR(field_var)) {
3658 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
3660 ret = PTR_ERR(field_var);
3665 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
3666 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3667 hist_data->n_save_var_str++;
3675 static int onmatch_create(struct hist_trigger_data *hist_data,
3676 struct action_data *data)
3678 return action_create(hist_data, data);
3681 static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
3683 char *match_event, *match_event_system;
3684 struct action_data *data;
3687 data = kzalloc(sizeof(*data), GFP_KERNEL);
3689 return ERR_PTR(-ENOMEM);
3691 match_event = strsep(&str, ")");
3692 if (!match_event || !str) {
3693 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
3697 match_event_system = strsep(&match_event, ".");
3699 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
3703 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
3704 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
3708 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
3709 if (!data->match_data.event) {
3714 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
3715 if (!data->match_data.event_system) {
3720 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
3726 onmatch_destroy(data);
3727 data = ERR_PTR(ret);
3731 static int create_hitcount_val(struct hist_trigger_data *hist_data)
3733 hist_data->fields[HITCOUNT_IDX] =
3734 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
3735 if (!hist_data->fields[HITCOUNT_IDX])
3738 hist_data->n_vals++;
3739 hist_data->n_fields++;
3741 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
3747 static int __create_val_field(struct hist_trigger_data *hist_data,
3748 unsigned int val_idx,
3749 struct trace_event_file *file,
3750 char *var_name, char *field_str,
3751 unsigned long flags)
3753 struct hist_field *hist_field;
3756 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
3757 if (IS_ERR(hist_field)) {
3758 ret = PTR_ERR(hist_field);
3762 hist_data->fields[val_idx] = hist_field;
3764 ++hist_data->n_vals;
3765 ++hist_data->n_fields;
3767 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3773 static int create_val_field(struct hist_trigger_data *hist_data,
3774 unsigned int val_idx,
3775 struct trace_event_file *file,
3778 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
3781 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
3784 static const char *no_comm = "(no comm)";
3786 static u64 hist_field_execname(struct hist_field *hist_field,
3787 struct tracing_map_elt *elt,
3788 struct trace_buffer *buffer,
3789 struct ring_buffer_event *rbe,
3792 struct hist_elt_data *elt_data;
3794 if (WARN_ON_ONCE(!elt))
3795 return (u64)(unsigned long)no_comm;
3797 elt_data = elt->private_data;
3799 if (WARN_ON_ONCE(!elt_data->comm))
3800 return (u64)(unsigned long)no_comm;
3802 return (u64)(unsigned long)(elt_data->comm);
3805 /* Convert a var that points to common_pid.execname to a string */
3806 static void update_var_execname(struct hist_field *hist_field)
3808 hist_field->flags = HIST_FIELD_FL_STRING | HIST_FIELD_FL_VAR |
3809 HIST_FIELD_FL_EXECNAME;
3810 hist_field->size = MAX_FILTER_STR_VAL;
3811 hist_field->is_signed = 0;
3813 kfree_const(hist_field->type);
3814 hist_field->type = "char[]";
3816 hist_field->fn = hist_field_execname;
3819 static int create_var_field(struct hist_trigger_data *hist_data,
3820 unsigned int val_idx,
3821 struct trace_event_file *file,
3822 char *var_name, char *expr_str)
3824 struct trace_array *tr = hist_data->event_file->tr;
3825 unsigned long flags = 0;
3828 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3831 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
3832 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
3836 flags |= HIST_FIELD_FL_VAR;
3837 hist_data->n_vars++;
3838 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
3841 ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
3843 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_EXECNAME)
3844 update_var_execname(hist_data->fields[val_idx]);
3846 if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
3847 hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
3852 static int create_val_fields(struct hist_trigger_data *hist_data,
3853 struct trace_event_file *file)
3855 char *fields_str, *field_str;
3856 unsigned int i, j = 1;
3859 ret = create_hitcount_val(hist_data);
3863 fields_str = hist_data->attrs->vals_str;
3867 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
3868 j < TRACING_MAP_VALS_MAX; i++) {
3869 field_str = strsep(&fields_str, ",");
3873 if (strcmp(field_str, "hitcount") == 0)
3876 ret = create_val_field(hist_data, j++, file, field_str);
3881 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
3887 static int create_key_field(struct hist_trigger_data *hist_data,
3888 unsigned int key_idx,
3889 unsigned int key_offset,
3890 struct trace_event_file *file,
3893 struct trace_array *tr = hist_data->event_file->tr;
3894 struct hist_field *hist_field = NULL;
3895 unsigned long flags = 0;
3896 unsigned int key_size;
3899 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
3902 flags |= HIST_FIELD_FL_KEY;
3904 if (strcmp(field_str, "stacktrace") == 0) {
3905 flags |= HIST_FIELD_FL_STACKTRACE;
3906 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
3907 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
3909 hist_field = parse_expr(hist_data, file, field_str, flags,
3911 if (IS_ERR(hist_field)) {
3912 ret = PTR_ERR(hist_field);
3916 if (field_has_hist_vars(hist_field, 0)) {
3917 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
3918 destroy_hist_field(hist_field, 0);
3923 key_size = hist_field->size;
3926 hist_data->fields[key_idx] = hist_field;
3928 key_size = ALIGN(key_size, sizeof(u64));
3929 hist_data->fields[key_idx]->size = key_size;
3930 hist_data->fields[key_idx]->offset = key_offset;
3932 hist_data->key_size += key_size;
3934 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
3939 hist_data->n_keys++;
3940 hist_data->n_fields++;
3942 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
3950 static int create_key_fields(struct hist_trigger_data *hist_data,
3951 struct trace_event_file *file)
3953 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
3954 char *fields_str, *field_str;
3957 fields_str = hist_data->attrs->keys_str;
3961 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
3962 field_str = strsep(&fields_str, ",");
3965 ret = create_key_field(hist_data, i, key_offset,
3980 static int create_var_fields(struct hist_trigger_data *hist_data,
3981 struct trace_event_file *file)
3983 unsigned int i, j = hist_data->n_vals;
3986 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
3988 for (i = 0; i < n_vars; i++) {
3989 char *var_name = hist_data->attrs->var_defs.name[i];
3990 char *expr = hist_data->attrs->var_defs.expr[i];
3992 ret = create_var_field(hist_data, j++, file, var_name, expr);
4000 static void free_var_defs(struct hist_trigger_data *hist_data)
4004 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4005 kfree(hist_data->attrs->var_defs.name[i]);
4006 kfree(hist_data->attrs->var_defs.expr[i]);
4009 hist_data->attrs->var_defs.n_vars = 0;
4012 static int parse_var_defs(struct hist_trigger_data *hist_data)
4014 struct trace_array *tr = hist_data->event_file->tr;
4015 char *s, *str, *var_name, *field_str;
4016 unsigned int i, j, n_vars = 0;
4019 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4020 str = hist_data->attrs->assignment_str[i];
4021 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4022 field_str = strsep(&str, ",");
4026 var_name = strsep(&field_str, "=");
4027 if (!var_name || !field_str) {
4028 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4034 if (n_vars == TRACING_MAP_VARS_MAX) {
4035 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
4040 s = kstrdup(var_name, GFP_KERNEL);
4045 hist_data->attrs->var_defs.name[n_vars] = s;
4047 s = kstrdup(field_str, GFP_KERNEL);
4052 hist_data->attrs->var_defs.expr[n_vars++] = s;
4054 hist_data->attrs->var_defs.n_vars = n_vars;
4060 free_var_defs(hist_data);
4065 static int create_hist_fields(struct hist_trigger_data *hist_data,
4066 struct trace_event_file *file)
4070 ret = parse_var_defs(hist_data);
4074 ret = create_val_fields(hist_data, file);
4078 ret = create_var_fields(hist_data, file);
4082 ret = create_key_fields(hist_data, file);
4086 free_var_defs(hist_data);
4091 static int is_descending(struct trace_array *tr, const char *str)
4096 if (strcmp(str, "descending") == 0)
4099 if (strcmp(str, "ascending") == 0)
4102 hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str));
4107 static int create_sort_keys(struct hist_trigger_data *hist_data)
4109 struct trace_array *tr = hist_data->event_file->tr;
4110 char *fields_str = hist_data->attrs->sort_key_str;
4111 struct tracing_map_sort_key *sort_key;
4112 int descending, ret = 0;
4113 unsigned int i, j, k;
4115 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4120 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
4121 struct hist_field *hist_field;
4122 char *field_str, *field_name;
4123 const char *test_name;
4125 sort_key = &hist_data->sort_keys[i];
4127 field_str = strsep(&fields_str, ",");
4133 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4137 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4138 hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort="));
4143 field_name = strsep(&field_str, ".");
4144 if (!field_name || !*field_name) {
4146 hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
4150 if (strcmp(field_name, "hitcount") == 0) {
4151 descending = is_descending(tr, field_str);
4152 if (descending < 0) {
4156 sort_key->descending = descending;
4160 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4163 hist_field = hist_data->fields[j];
4164 if (hist_field->flags & HIST_FIELD_FL_VAR)
4169 test_name = hist_field_name(hist_field, 0);
4171 if (strcmp(field_name, test_name) == 0) {
4172 sort_key->field_idx = idx;
4173 descending = is_descending(tr, field_str);
4174 if (descending < 0) {
4178 sort_key->descending = descending;
4182 if (j == hist_data->n_fields) {
4184 hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name));
4189 hist_data->n_sort_keys = i;
4194 static void destroy_actions(struct hist_trigger_data *hist_data)
4198 for (i = 0; i < hist_data->n_actions; i++) {
4199 struct action_data *data = hist_data->actions[i];
4201 if (data->handler == HANDLER_ONMATCH)
4202 onmatch_destroy(data);
4203 else if (data->handler == HANDLER_ONMAX ||
4204 data->handler == HANDLER_ONCHANGE)
4205 track_data_destroy(hist_data, data);
4211 static int parse_actions(struct hist_trigger_data *hist_data)
4213 struct trace_array *tr = hist_data->event_file->tr;
4214 struct action_data *data;
4220 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4221 str = hist_data->attrs->action_str[i];
4223 if ((len = str_has_prefix(str, "onmatch("))) {
4224 char *action_str = str + len;
4226 data = onmatch_parse(tr, action_str);
4228 ret = PTR_ERR(data);
4231 } else if ((len = str_has_prefix(str, "onmax("))) {
4232 char *action_str = str + len;
4234 data = track_data_parse(hist_data, action_str,
4237 ret = PTR_ERR(data);
4240 } else if ((len = str_has_prefix(str, "onchange("))) {
4241 char *action_str = str + len;
4243 data = track_data_parse(hist_data, action_str,
4246 ret = PTR_ERR(data);
4254 hist_data->actions[hist_data->n_actions++] = data;
4260 static int create_actions(struct hist_trigger_data *hist_data)
4262 struct action_data *data;
4266 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4267 data = hist_data->actions[i];
4269 if (data->handler == HANDLER_ONMATCH) {
4270 ret = onmatch_create(hist_data, data);
4273 } else if (data->handler == HANDLER_ONMAX ||
4274 data->handler == HANDLER_ONCHANGE) {
4275 ret = track_data_create(hist_data, data);
4287 static void print_actions(struct seq_file *m,
4288 struct hist_trigger_data *hist_data,
4289 struct tracing_map_elt *elt)
4293 for (i = 0; i < hist_data->n_actions; i++) {
4294 struct action_data *data = hist_data->actions[i];
4296 if (data->action == ACTION_SNAPSHOT)
4299 if (data->handler == HANDLER_ONMAX ||
4300 data->handler == HANDLER_ONCHANGE)
4301 track_data_print(m, hist_data, elt, data);
4305 static void print_action_spec(struct seq_file *m,
4306 struct hist_trigger_data *hist_data,
4307 struct action_data *data)
4311 if (data->action == ACTION_SAVE) {
4312 for (i = 0; i < hist_data->n_save_vars; i++) {
4313 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4314 if (i < hist_data->n_save_vars - 1)
4317 } else if (data->action == ACTION_TRACE) {
4318 if (data->use_trace_keyword)
4319 seq_printf(m, "%s", data->synth_event_name);
4320 for (i = 0; i < data->n_params; i++) {
4321 if (i || data->use_trace_keyword)
4323 seq_printf(m, "%s", data->params[i]);
4328 static void print_track_data_spec(struct seq_file *m,
4329 struct hist_trigger_data *hist_data,
4330 struct action_data *data)
4332 if (data->handler == HANDLER_ONMAX)
4333 seq_puts(m, ":onmax(");
4334 else if (data->handler == HANDLER_ONCHANGE)
4335 seq_puts(m, ":onchange(");
4336 seq_printf(m, "%s", data->track_data.var_str);
4337 seq_printf(m, ").%s(", data->action_name);
4339 print_action_spec(m, hist_data, data);
4344 static void print_onmatch_spec(struct seq_file *m,
4345 struct hist_trigger_data *hist_data,
4346 struct action_data *data)
4348 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
4349 data->match_data.event);
4351 seq_printf(m, "%s(", data->action_name);
4353 print_action_spec(m, hist_data, data);
4358 static bool actions_match(struct hist_trigger_data *hist_data,
4359 struct hist_trigger_data *hist_data_test)
4363 if (hist_data->n_actions != hist_data_test->n_actions)
4366 for (i = 0; i < hist_data->n_actions; i++) {
4367 struct action_data *data = hist_data->actions[i];
4368 struct action_data *data_test = hist_data_test->actions[i];
4369 char *action_name, *action_name_test;
4371 if (data->handler != data_test->handler)
4373 if (data->action != data_test->action)
4376 if (data->n_params != data_test->n_params)
4379 for (j = 0; j < data->n_params; j++) {
4380 if (strcmp(data->params[j], data_test->params[j]) != 0)
4384 if (data->use_trace_keyword)
4385 action_name = data->synth_event_name;
4387 action_name = data->action_name;
4389 if (data_test->use_trace_keyword)
4390 action_name_test = data_test->synth_event_name;
4392 action_name_test = data_test->action_name;
4394 if (strcmp(action_name, action_name_test) != 0)
4397 if (data->handler == HANDLER_ONMATCH) {
4398 if (strcmp(data->match_data.event_system,
4399 data_test->match_data.event_system) != 0)
4401 if (strcmp(data->match_data.event,
4402 data_test->match_data.event) != 0)
4404 } else if (data->handler == HANDLER_ONMAX ||
4405 data->handler == HANDLER_ONCHANGE) {
4406 if (strcmp(data->track_data.var_str,
4407 data_test->track_data.var_str) != 0)
4416 static void print_actions_spec(struct seq_file *m,
4417 struct hist_trigger_data *hist_data)
4421 for (i = 0; i < hist_data->n_actions; i++) {
4422 struct action_data *data = hist_data->actions[i];
4424 if (data->handler == HANDLER_ONMATCH)
4425 print_onmatch_spec(m, hist_data, data);
4426 else if (data->handler == HANDLER_ONMAX ||
4427 data->handler == HANDLER_ONCHANGE)
4428 print_track_data_spec(m, hist_data, data);
4432 static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
4436 for (i = 0; i < hist_data->n_field_var_hists; i++) {
4437 kfree(hist_data->field_var_hists[i]->cmd);
4438 kfree(hist_data->field_var_hists[i]);
4442 static void destroy_hist_data(struct hist_trigger_data *hist_data)
4447 destroy_hist_trigger_attrs(hist_data->attrs);
4448 destroy_hist_fields(hist_data);
4449 tracing_map_destroy(hist_data->map);
4451 destroy_actions(hist_data);
4452 destroy_field_vars(hist_data);
4453 destroy_field_var_hists(hist_data);
4458 static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
4460 struct tracing_map *map = hist_data->map;
4461 struct ftrace_event_field *field;
4462 struct hist_field *hist_field;
4465 for_each_hist_field(i, hist_data) {
4466 hist_field = hist_data->fields[i];
4467 if (hist_field->flags & HIST_FIELD_FL_KEY) {
4468 tracing_map_cmp_fn_t cmp_fn;
4470 field = hist_field->field;
4472 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
4473 cmp_fn = tracing_map_cmp_none;
4475 cmp_fn = tracing_map_cmp_num(hist_field->size,
4476 hist_field->is_signed);
4477 else if (is_string_field(field))
4478 cmp_fn = tracing_map_cmp_string;
4480 cmp_fn = tracing_map_cmp_num(field->size,
4482 idx = tracing_map_add_key_field(map,
4485 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
4486 idx = tracing_map_add_sum_field(map);
4491 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4492 idx = tracing_map_add_var(map);
4495 hist_field->var.idx = idx;
4496 hist_field->var.hist_data = hist_data;
4503 static struct hist_trigger_data *
4504 create_hist_data(unsigned int map_bits,
4505 struct hist_trigger_attrs *attrs,
4506 struct trace_event_file *file,
4509 const struct tracing_map_ops *map_ops = NULL;
4510 struct hist_trigger_data *hist_data;
4513 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
4515 return ERR_PTR(-ENOMEM);
4517 hist_data->attrs = attrs;
4518 hist_data->remove = remove;
4519 hist_data->event_file = file;
4521 ret = parse_actions(hist_data);
4525 ret = create_hist_fields(hist_data, file);
4529 ret = create_sort_keys(hist_data);
4533 map_ops = &hist_trigger_elt_data_ops;
4535 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
4536 map_ops, hist_data);
4537 if (IS_ERR(hist_data->map)) {
4538 ret = PTR_ERR(hist_data->map);
4539 hist_data->map = NULL;
4543 ret = create_tracing_map_fields(hist_data);
4549 hist_data->attrs = NULL;
4551 destroy_hist_data(hist_data);
4553 hist_data = ERR_PTR(ret);
4558 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
4559 struct tracing_map_elt *elt,
4560 struct trace_buffer *buffer, void *rec,
4561 struct ring_buffer_event *rbe,
4564 struct hist_elt_data *elt_data;
4565 struct hist_field *hist_field;
4566 unsigned int i, var_idx;
4569 elt_data = elt->private_data;
4570 elt_data->var_ref_vals = var_ref_vals;
4572 for_each_hist_val_field(i, hist_data) {
4573 hist_field = hist_data->fields[i];
4574 hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
4575 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4576 var_idx = hist_field->var.idx;
4578 if (hist_field->flags & HIST_FIELD_FL_STRING) {
4579 unsigned int str_start, var_str_idx, idx;
4580 char *str, *val_str;
4582 str_start = hist_data->n_field_var_str +
4583 hist_data->n_save_var_str;
4584 var_str_idx = hist_field->var_str_idx;
4585 idx = str_start + var_str_idx;
4587 str = elt_data->field_var_str[idx];
4588 val_str = (char *)(uintptr_t)hist_val;
4589 strscpy(str, val_str, STR_VAR_LEN_MAX);
4591 hist_val = (u64)(uintptr_t)str;
4593 tracing_map_set_var(elt, var_idx, hist_val);
4596 tracing_map_update_sum(elt, i, hist_val);
4599 for_each_hist_key_field(i, hist_data) {
4600 hist_field = hist_data->fields[i];
4601 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4602 hist_val = hist_field->fn(hist_field, elt, buffer, rbe, rec);
4603 var_idx = hist_field->var.idx;
4604 tracing_map_set_var(elt, var_idx, hist_val);
4608 update_field_vars(hist_data, elt, buffer, rbe, rec);
4611 static inline void add_to_key(char *compound_key, void *key,
4612 struct hist_field *key_field, void *rec)
4614 size_t size = key_field->size;
4616 if (key_field->flags & HIST_FIELD_FL_STRING) {
4617 struct ftrace_event_field *field;
4619 field = key_field->field;
4620 if (field->filter_type == FILTER_DYN_STRING)
4621 size = *(u32 *)(rec + field->offset) >> 16;
4622 else if (field->filter_type == FILTER_STATIC_STRING)
4625 /* ensure NULL-termination */
4626 if (size > key_field->size - 1)
4627 size = key_field->size - 1;
4629 strncpy(compound_key + key_field->offset, (char *)key, size);
4631 memcpy(compound_key + key_field->offset, key, size);
4635 hist_trigger_actions(struct hist_trigger_data *hist_data,
4636 struct tracing_map_elt *elt,
4637 struct trace_buffer *buffer, void *rec,
4638 struct ring_buffer_event *rbe, void *key,
4641 struct action_data *data;
4644 for (i = 0; i < hist_data->n_actions; i++) {
4645 data = hist_data->actions[i];
4646 data->fn(hist_data, elt, buffer, rec, rbe, key, data, var_ref_vals);
4650 static void event_hist_trigger(struct event_trigger_data *data,
4651 struct trace_buffer *buffer, void *rec,
4652 struct ring_buffer_event *rbe)
4654 struct hist_trigger_data *hist_data = data->private_data;
4655 bool use_compound_key = (hist_data->n_keys > 1);
4656 unsigned long entries[HIST_STACKTRACE_DEPTH];
4657 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
4658 char compound_key[HIST_KEY_SIZE_MAX];
4659 struct tracing_map_elt *elt = NULL;
4660 struct hist_field *key_field;
4665 memset(compound_key, 0, hist_data->key_size);
4667 for_each_hist_key_field(i, hist_data) {
4668 key_field = hist_data->fields[i];
4670 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4671 memset(entries, 0, HIST_STACKTRACE_SIZE);
4672 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
4673 HIST_STACKTRACE_SKIP);
4676 field_contents = key_field->fn(key_field, elt, buffer, rbe, rec);
4677 if (key_field->flags & HIST_FIELD_FL_STRING) {
4678 key = (void *)(unsigned long)field_contents;
4679 use_compound_key = true;
4681 key = (void *)&field_contents;
4684 if (use_compound_key)
4685 add_to_key(compound_key, key, key_field, rec);
4688 if (use_compound_key)
4691 if (hist_data->n_var_refs &&
4692 !resolve_var_refs(hist_data, key, var_ref_vals, false))
4695 elt = tracing_map_insert(hist_data->map, key);
4699 hist_trigger_elt_update(hist_data, elt, buffer, rec, rbe, var_ref_vals);
4701 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
4702 hist_trigger_actions(hist_data, elt, buffer, rec, rbe, key, var_ref_vals);
4705 static void hist_trigger_stacktrace_print(struct seq_file *m,
4706 unsigned long *stacktrace_entries,
4707 unsigned int max_entries)
4709 char str[KSYM_SYMBOL_LEN];
4710 unsigned int spaces = 8;
4713 for (i = 0; i < max_entries; i++) {
4714 if (!stacktrace_entries[i])
4717 seq_printf(m, "%*c", 1 + spaces, ' ');
4718 sprint_symbol(str, stacktrace_entries[i]);
4719 seq_printf(m, "%s\n", str);
4723 static void hist_trigger_print_key(struct seq_file *m,
4724 struct hist_trigger_data *hist_data,
4726 struct tracing_map_elt *elt)
4728 struct hist_field *key_field;
4729 char str[KSYM_SYMBOL_LEN];
4730 bool multiline = false;
4731 const char *field_name;
4737 for_each_hist_key_field(i, hist_data) {
4738 key_field = hist_data->fields[i];
4740 if (i > hist_data->n_vals)
4743 field_name = hist_field_name(key_field, 0);
4745 if (key_field->flags & HIST_FIELD_FL_HEX) {
4746 uval = *(u64 *)(key + key_field->offset);
4747 seq_printf(m, "%s: %llx", field_name, uval);
4748 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
4749 uval = *(u64 *)(key + key_field->offset);
4750 sprint_symbol_no_offset(str, uval);
4751 seq_printf(m, "%s: [%llx] %-45s", field_name,
4753 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
4754 uval = *(u64 *)(key + key_field->offset);
4755 sprint_symbol(str, uval);
4756 seq_printf(m, "%s: [%llx] %-55s", field_name,
4758 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
4759 struct hist_elt_data *elt_data = elt->private_data;
4762 if (WARN_ON_ONCE(!elt_data))
4765 comm = elt_data->comm;
4767 uval = *(u64 *)(key + key_field->offset);
4768 seq_printf(m, "%s: %-16s[%10llu]", field_name,
4770 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
4771 const char *syscall_name;
4773 uval = *(u64 *)(key + key_field->offset);
4774 syscall_name = get_syscall_name(uval);
4776 syscall_name = "unknown_syscall";
4778 seq_printf(m, "%s: %-30s[%3llu]", field_name,
4779 syscall_name, uval);
4780 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4781 seq_puts(m, "stacktrace:\n");
4782 hist_trigger_stacktrace_print(m,
4783 key + key_field->offset,
4784 HIST_STACKTRACE_DEPTH);
4786 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
4787 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4788 *(u64 *)(key + key_field->offset));
4789 } else if (key_field->flags & HIST_FIELD_FL_BUCKET) {
4790 unsigned long buckets = key_field->buckets;
4791 uval = *(u64 *)(key + key_field->offset);
4792 seq_printf(m, "%s: ~ %llu-%llu", field_name,
4793 uval, uval + buckets -1);
4794 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
4795 seq_printf(m, "%s: %-50s", field_name,
4796 (char *)(key + key_field->offset));
4798 uval = *(u64 *)(key + key_field->offset);
4799 seq_printf(m, "%s: %10llu", field_name, uval);
4809 static void hist_trigger_entry_print(struct seq_file *m,
4810 struct hist_trigger_data *hist_data,
4812 struct tracing_map_elt *elt)
4814 const char *field_name;
4817 hist_trigger_print_key(m, hist_data, key, elt);
4819 seq_printf(m, " hitcount: %10llu",
4820 tracing_map_read_sum(elt, HITCOUNT_IDX));
4822 for (i = 1; i < hist_data->n_vals; i++) {
4823 field_name = hist_field_name(hist_data->fields[i], 0);
4825 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
4826 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
4829 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
4830 seq_printf(m, " %s: %10llx", field_name,
4831 tracing_map_read_sum(elt, i));
4833 seq_printf(m, " %s: %10llu", field_name,
4834 tracing_map_read_sum(elt, i));
4838 print_actions(m, hist_data, elt);
4843 static int print_entries(struct seq_file *m,
4844 struct hist_trigger_data *hist_data)
4846 struct tracing_map_sort_entry **sort_entries = NULL;
4847 struct tracing_map *map = hist_data->map;
4850 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
4851 hist_data->n_sort_keys,
4856 for (i = 0; i < n_entries; i++)
4857 hist_trigger_entry_print(m, hist_data,
4858 sort_entries[i]->key,
4859 sort_entries[i]->elt);
4861 tracing_map_destroy_sort_entries(sort_entries, n_entries);
4866 static void hist_trigger_show(struct seq_file *m,
4867 struct event_trigger_data *data, int n)
4869 struct hist_trigger_data *hist_data;
4873 seq_puts(m, "\n\n");
4875 seq_puts(m, "# event histogram\n#\n# trigger info: ");
4876 data->ops->print(m, data->ops, data);
4877 seq_puts(m, "#\n\n");
4879 hist_data = data->private_data;
4880 n_entries = print_entries(m, hist_data);
4884 track_data_snapshot_print(m, hist_data);
4886 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
4887 (u64)atomic64_read(&hist_data->map->hits),
4888 n_entries, (u64)atomic64_read(&hist_data->map->drops));
4891 static int hist_show(struct seq_file *m, void *v)
4893 struct event_trigger_data *data;
4894 struct trace_event_file *event_file;
4897 mutex_lock(&event_mutex);
4899 event_file = event_file_data(m->private);
4900 if (unlikely(!event_file)) {
4905 list_for_each_entry(data, &event_file->triggers, list) {
4906 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
4907 hist_trigger_show(m, data, n++);
4911 mutex_unlock(&event_mutex);
4916 static int event_hist_open(struct inode *inode, struct file *file)
4920 ret = security_locked_down(LOCKDOWN_TRACEFS);
4924 return single_open(file, hist_show, file);
4927 const struct file_operations event_hist_fops = {
4928 .open = event_hist_open,
4930 .llseek = seq_lseek,
4931 .release = single_release,
4934 #ifdef CONFIG_HIST_TRIGGERS_DEBUG
4935 static void hist_field_debug_show_flags(struct seq_file *m,
4936 unsigned long flags)
4938 seq_puts(m, " flags:\n");
4940 if (flags & HIST_FIELD_FL_KEY)
4941 seq_puts(m, " HIST_FIELD_FL_KEY\n");
4942 else if (flags & HIST_FIELD_FL_HITCOUNT)
4943 seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n");
4944 else if (flags & HIST_FIELD_FL_VAR)
4945 seq_puts(m, " HIST_FIELD_FL_VAR\n");
4946 else if (flags & HIST_FIELD_FL_VAR_REF)
4947 seq_puts(m, " HIST_FIELD_FL_VAR_REF\n");
4949 seq_puts(m, " VAL: normal u64 value\n");
4951 if (flags & HIST_FIELD_FL_ALIAS)
4952 seq_puts(m, " HIST_FIELD_FL_ALIAS\n");
4955 static int hist_field_debug_show(struct seq_file *m,
4956 struct hist_field *field, unsigned long flags)
4958 if ((field->flags & flags) != flags) {
4959 seq_printf(m, "ERROR: bad flags - %lx\n", flags);
4963 hist_field_debug_show_flags(m, field->flags);
4965 seq_printf(m, " ftrace_event_field name: %s\n",
4966 field->field->name);
4968 if (field->flags & HIST_FIELD_FL_VAR) {
4969 seq_printf(m, " var.name: %s\n", field->var.name);
4970 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
4974 if (field->flags & HIST_FIELD_FL_ALIAS)
4975 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
4976 field->var_ref_idx);
4978 if (field->flags & HIST_FIELD_FL_VAR_REF) {
4979 seq_printf(m, " name: %s\n", field->name);
4980 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
4982 seq_printf(m, " var.hist_data: %p\n", field->var.hist_data);
4983 seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
4984 field->var_ref_idx);
4986 seq_printf(m, " system: %s\n", field->system);
4987 if (field->event_name)
4988 seq_printf(m, " event_name: %s\n", field->event_name);
4991 seq_printf(m, " type: %s\n", field->type);
4992 seq_printf(m, " size: %u\n", field->size);
4993 seq_printf(m, " is_signed: %u\n", field->is_signed);
4998 static int field_var_debug_show(struct seq_file *m,
4999 struct field_var *field_var, unsigned int i,
5002 const char *vars_name = save_vars ? "save_vars" : "field_vars";
5003 struct hist_field *field;
5006 seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i);
5008 field = field_var->var;
5010 seq_printf(m, "\n %s[%d].var:\n", vars_name, i);
5012 hist_field_debug_show_flags(m, field->flags);
5013 seq_printf(m, " var.name: %s\n", field->var.name);
5014 seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
5017 field = field_var->val;
5019 seq_printf(m, "\n %s[%d].val:\n", vars_name, i);
5021 seq_printf(m, " ftrace_event_field name: %s\n",
5022 field->field->name);
5028 seq_printf(m, " type: %s\n", field->type);
5029 seq_printf(m, " size: %u\n", field->size);
5030 seq_printf(m, " is_signed: %u\n", field->is_signed);
5035 static int hist_action_debug_show(struct seq_file *m,
5036 struct action_data *data, int i)
5040 if (data->handler == HANDLER_ONMAX ||
5041 data->handler == HANDLER_ONCHANGE) {
5042 seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i);
5043 ret = hist_field_debug_show(m, data->track_data.var_ref,
5044 HIST_FIELD_FL_VAR_REF);
5048 seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i);
5049 ret = hist_field_debug_show(m, data->track_data.track_var,
5055 if (data->handler == HANDLER_ONMATCH) {
5056 seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n",
5057 i, data->match_data.event_system);
5058 seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n",
5059 i, data->match_data.event);
5065 static int hist_actions_debug_show(struct seq_file *m,
5066 struct hist_trigger_data *hist_data)
5070 if (hist_data->n_actions)
5071 seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n");
5073 for (i = 0; i < hist_data->n_actions; i++) {
5074 struct action_data *action = hist_data->actions[i];
5076 ret = hist_action_debug_show(m, action, i);
5081 if (hist_data->n_save_vars)
5082 seq_puts(m, "\n save action variables (save() params):\n");
5084 for (i = 0; i < hist_data->n_save_vars; i++) {
5085 ret = field_var_debug_show(m, hist_data->save_vars[i], i, true);
5093 static void hist_trigger_debug_show(struct seq_file *m,
5094 struct event_trigger_data *data, int n)
5096 struct hist_trigger_data *hist_data;
5100 seq_puts(m, "\n\n");
5102 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5103 data->ops->print(m, data->ops, data);
5104 seq_puts(m, "#\n\n");
5106 hist_data = data->private_data;
5108 seq_printf(m, "hist_data: %p\n\n", hist_data);
5109 seq_printf(m, " n_vals: %u\n", hist_data->n_vals);
5110 seq_printf(m, " n_keys: %u\n", hist_data->n_keys);
5111 seq_printf(m, " n_fields: %u\n", hist_data->n_fields);
5113 seq_puts(m, "\n val fields:\n\n");
5115 seq_puts(m, " hist_data->fields[0]:\n");
5116 ret = hist_field_debug_show(m, hist_data->fields[0],
5117 HIST_FIELD_FL_HITCOUNT);
5121 for (i = 1; i < hist_data->n_vals; i++) {
5122 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5123 ret = hist_field_debug_show(m, hist_data->fields[i], 0);
5128 seq_puts(m, "\n key fields:\n");
5130 for (i = hist_data->n_vals; i < hist_data->n_fields; i++) {
5131 seq_printf(m, "\n hist_data->fields[%d]:\n", i);
5132 ret = hist_field_debug_show(m, hist_data->fields[i],
5138 if (hist_data->n_var_refs)
5139 seq_puts(m, "\n variable reference fields:\n");
5141 for (i = 0; i < hist_data->n_var_refs; i++) {
5142 seq_printf(m, "\n hist_data->var_refs[%d]:\n", i);
5143 ret = hist_field_debug_show(m, hist_data->var_refs[i],
5144 HIST_FIELD_FL_VAR_REF);
5149 if (hist_data->n_field_vars)
5150 seq_puts(m, "\n field variables:\n");
5152 for (i = 0; i < hist_data->n_field_vars; i++) {
5153 ret = field_var_debug_show(m, hist_data->field_vars[i], i, false);
5158 ret = hist_actions_debug_show(m, hist_data);
5163 static int hist_debug_show(struct seq_file *m, void *v)
5165 struct event_trigger_data *data;
5166 struct trace_event_file *event_file;
5169 mutex_lock(&event_mutex);
5171 event_file = event_file_data(m->private);
5172 if (unlikely(!event_file)) {
5177 list_for_each_entry(data, &event_file->triggers, list) {
5178 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5179 hist_trigger_debug_show(m, data, n++);
5183 mutex_unlock(&event_mutex);
5188 static int event_hist_debug_open(struct inode *inode, struct file *file)
5192 ret = security_locked_down(LOCKDOWN_TRACEFS);
5196 return single_open(file, hist_debug_show, file);
5199 const struct file_operations event_hist_debug_fops = {
5200 .open = event_hist_debug_open,
5202 .llseek = seq_lseek,
5203 .release = single_release,
5207 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5209 const char *field_name = hist_field_name(hist_field, 0);
5211 if (hist_field->var.name)
5212 seq_printf(m, "%s=", hist_field->var.name);
5214 if (hist_field->flags & HIST_FIELD_FL_CPU)
5215 seq_puts(m, "common_cpu");
5216 else if (field_name) {
5217 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5218 hist_field->flags & HIST_FIELD_FL_ALIAS)
5220 seq_printf(m, "%s", field_name);
5221 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5222 seq_puts(m, "common_timestamp");
5224 if (hist_field->flags) {
5225 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5226 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5227 const char *flags = get_hist_field_flags(hist_field);
5230 seq_printf(m, ".%s", flags);
5233 if (hist_field->buckets)
5234 seq_printf(m, "=%ld", hist_field->buckets);
5237 static int event_hist_trigger_print(struct seq_file *m,
5238 struct event_trigger_ops *ops,
5239 struct event_trigger_data *data)
5241 struct hist_trigger_data *hist_data = data->private_data;
5242 struct hist_field *field;
5243 bool have_var = false;
5246 seq_puts(m, "hist:");
5249 seq_printf(m, "%s:", data->name);
5251 seq_puts(m, "keys=");
5253 for_each_hist_key_field(i, hist_data) {
5254 field = hist_data->fields[i];
5256 if (i > hist_data->n_vals)
5259 if (field->flags & HIST_FIELD_FL_STACKTRACE)
5260 seq_puts(m, "stacktrace");
5262 hist_field_print(m, field);
5265 seq_puts(m, ":vals=");
5267 for_each_hist_val_field(i, hist_data) {
5268 field = hist_data->fields[i];
5269 if (field->flags & HIST_FIELD_FL_VAR) {
5274 if (i == HITCOUNT_IDX)
5275 seq_puts(m, "hitcount");
5278 hist_field_print(m, field);
5287 for_each_hist_val_field(i, hist_data) {
5288 field = hist_data->fields[i];
5290 if (field->flags & HIST_FIELD_FL_VAR) {
5293 hist_field_print(m, field);
5298 seq_puts(m, ":sort=");
5300 for (i = 0; i < hist_data->n_sort_keys; i++) {
5301 struct tracing_map_sort_key *sort_key;
5302 unsigned int idx, first_key_idx;
5305 first_key_idx = hist_data->n_vals - hist_data->n_vars;
5307 sort_key = &hist_data->sort_keys[i];
5308 idx = sort_key->field_idx;
5310 if (WARN_ON(idx >= HIST_FIELDS_MAX))
5316 if (idx == HITCOUNT_IDX)
5317 seq_puts(m, "hitcount");
5319 if (idx >= first_key_idx)
5320 idx += hist_data->n_vars;
5321 hist_field_print(m, hist_data->fields[idx]);
5324 if (sort_key->descending)
5325 seq_puts(m, ".descending");
5327 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
5328 if (hist_data->enable_timestamps)
5329 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
5331 print_actions_spec(m, hist_data);
5333 if (data->filter_str)
5334 seq_printf(m, " if %s", data->filter_str);
5337 seq_puts(m, " [paused]");
5339 seq_puts(m, " [active]");
5346 static int event_hist_trigger_init(struct event_trigger_ops *ops,
5347 struct event_trigger_data *data)
5349 struct hist_trigger_data *hist_data = data->private_data;
5351 if (!data->ref && hist_data->attrs->name)
5352 save_named_trigger(hist_data->attrs->name, data);
5359 static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5361 struct trace_event_file *file;
5366 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5367 file = hist_data->field_var_hists[i]->hist_data->event_file;
5368 cmd = hist_data->field_var_hists[i]->cmd;
5369 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5370 "!hist", "hist", cmd);
5371 WARN_ON_ONCE(ret < 0);
5375 static void event_hist_trigger_free(struct event_trigger_ops *ops,
5376 struct event_trigger_data *data)
5378 struct hist_trigger_data *hist_data = data->private_data;
5380 if (WARN_ON_ONCE(data->ref <= 0))
5386 del_named_trigger(data);
5388 trigger_data_free(data);
5390 remove_hist_vars(hist_data);
5392 unregister_field_var_hists(hist_data);
5394 destroy_hist_data(hist_data);
5398 static struct event_trigger_ops event_hist_trigger_ops = {
5399 .func = event_hist_trigger,
5400 .print = event_hist_trigger_print,
5401 .init = event_hist_trigger_init,
5402 .free = event_hist_trigger_free,
5405 static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5406 struct event_trigger_data *data)
5410 save_named_trigger(data->named_data->name, data);
5412 event_hist_trigger_init(ops, data->named_data);
5417 static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5418 struct event_trigger_data *data)
5420 if (WARN_ON_ONCE(data->ref <= 0))
5423 event_hist_trigger_free(ops, data->named_data);
5427 del_named_trigger(data);
5428 trigger_data_free(data);
5432 static struct event_trigger_ops event_hist_trigger_named_ops = {
5433 .func = event_hist_trigger,
5434 .print = event_hist_trigger_print,
5435 .init = event_hist_trigger_named_init,
5436 .free = event_hist_trigger_named_free,
5439 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5442 return &event_hist_trigger_ops;
5445 static void hist_clear(struct event_trigger_data *data)
5447 struct hist_trigger_data *hist_data = data->private_data;
5450 pause_named_trigger(data);
5452 tracepoint_synchronize_unregister();
5454 tracing_map_clear(hist_data->map);
5457 unpause_named_trigger(data);
5460 static bool compatible_field(struct ftrace_event_field *field,
5461 struct ftrace_event_field *test_field)
5463 if (field == test_field)
5465 if (field == NULL || test_field == NULL)
5467 if (strcmp(field->name, test_field->name) != 0)
5469 if (strcmp(field->type, test_field->type) != 0)
5471 if (field->size != test_field->size)
5473 if (field->is_signed != test_field->is_signed)
5479 static bool hist_trigger_match(struct event_trigger_data *data,
5480 struct event_trigger_data *data_test,
5481 struct event_trigger_data *named_data,
5484 struct tracing_map_sort_key *sort_key, *sort_key_test;
5485 struct hist_trigger_data *hist_data, *hist_data_test;
5486 struct hist_field *key_field, *key_field_test;
5489 if (named_data && (named_data != data_test) &&
5490 (named_data != data_test->named_data))
5493 if (!named_data && is_named_trigger(data_test))
5496 hist_data = data->private_data;
5497 hist_data_test = data_test->private_data;
5499 if (hist_data->n_vals != hist_data_test->n_vals ||
5500 hist_data->n_fields != hist_data_test->n_fields ||
5501 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5504 if (!ignore_filter) {
5505 if ((data->filter_str && !data_test->filter_str) ||
5506 (!data->filter_str && data_test->filter_str))
5510 for_each_hist_field(i, hist_data) {
5511 key_field = hist_data->fields[i];
5512 key_field_test = hist_data_test->fields[i];
5514 if (key_field->flags != key_field_test->flags)
5516 if (!compatible_field(key_field->field, key_field_test->field))
5518 if (key_field->offset != key_field_test->offset)
5520 if (key_field->size != key_field_test->size)
5522 if (key_field->is_signed != key_field_test->is_signed)
5524 if (!!key_field->var.name != !!key_field_test->var.name)
5526 if (key_field->var.name &&
5527 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5531 for (i = 0; i < hist_data->n_sort_keys; i++) {
5532 sort_key = &hist_data->sort_keys[i];
5533 sort_key_test = &hist_data_test->sort_keys[i];
5535 if (sort_key->field_idx != sort_key_test->field_idx ||
5536 sort_key->descending != sort_key_test->descending)
5540 if (!ignore_filter && data->filter_str &&
5541 (strcmp(data->filter_str, data_test->filter_str) != 0))
5544 if (!actions_match(hist_data, hist_data_test))
5550 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5551 struct event_trigger_data *data,
5552 struct trace_event_file *file)
5554 struct hist_trigger_data *hist_data = data->private_data;
5555 struct event_trigger_data *test, *named_data = NULL;
5556 struct trace_array *tr = file->tr;
5559 if (hist_data->attrs->name) {
5560 named_data = find_named_trigger(hist_data->attrs->name);
5562 if (!hist_trigger_match(data, named_data, named_data,
5564 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5571 if (hist_data->attrs->name && !named_data)
5574 lockdep_assert_held(&event_mutex);
5576 list_for_each_entry(test, &file->triggers, list) {
5577 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5578 if (!hist_trigger_match(data, test, named_data, false))
5580 if (hist_data->attrs->pause)
5581 test->paused = true;
5582 else if (hist_data->attrs->cont)
5583 test->paused = false;
5584 else if (hist_data->attrs->clear)
5587 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
5594 if (hist_data->attrs->cont || hist_data->attrs->clear) {
5595 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
5600 if (hist_data->attrs->pause)
5601 data->paused = true;
5604 data->private_data = named_data->private_data;
5605 set_named_trigger_data(data, named_data);
5606 data->ops = &event_hist_trigger_named_ops;
5609 if (data->ops->init) {
5610 ret = data->ops->init(data->ops, data);
5615 if (hist_data->enable_timestamps) {
5616 char *clock = hist_data->attrs->clock;
5618 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5620 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
5624 tracing_set_filter_buffering(file->tr, true);
5628 destroy_hist_data(hist_data);
5635 static int hist_trigger_enable(struct event_trigger_data *data,
5636 struct trace_event_file *file)
5640 list_add_tail_rcu(&data->list, &file->triggers);
5642 update_cond_flag(file);
5644 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5645 list_del_rcu(&data->list);
5646 update_cond_flag(file);
5653 static bool have_hist_trigger_match(struct event_trigger_data *data,
5654 struct trace_event_file *file)
5656 struct hist_trigger_data *hist_data = data->private_data;
5657 struct event_trigger_data *test, *named_data = NULL;
5660 lockdep_assert_held(&event_mutex);
5662 if (hist_data->attrs->name)
5663 named_data = find_named_trigger(hist_data->attrs->name);
5665 list_for_each_entry(test, &file->triggers, list) {
5666 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5667 if (hist_trigger_match(data, test, named_data, false)) {
5677 static bool hist_trigger_check_refs(struct event_trigger_data *data,
5678 struct trace_event_file *file)
5680 struct hist_trigger_data *hist_data = data->private_data;
5681 struct event_trigger_data *test, *named_data = NULL;
5683 lockdep_assert_held(&event_mutex);
5685 if (hist_data->attrs->name)
5686 named_data = find_named_trigger(hist_data->attrs->name);
5688 list_for_each_entry(test, &file->triggers, list) {
5689 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5690 if (!hist_trigger_match(data, test, named_data, false))
5692 hist_data = test->private_data;
5693 if (check_var_refs(hist_data))
5702 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
5703 struct event_trigger_data *data,
5704 struct trace_event_file *file)
5706 struct hist_trigger_data *hist_data = data->private_data;
5707 struct event_trigger_data *test, *named_data = NULL;
5708 bool unregistered = false;
5710 lockdep_assert_held(&event_mutex);
5712 if (hist_data->attrs->name)
5713 named_data = find_named_trigger(hist_data->attrs->name);
5715 list_for_each_entry(test, &file->triggers, list) {
5716 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5717 if (!hist_trigger_match(data, test, named_data, false))
5719 unregistered = true;
5720 list_del_rcu(&test->list);
5721 trace_event_trigger_enable_disable(file, 0);
5722 update_cond_flag(file);
5727 if (unregistered && test->ops->free)
5728 test->ops->free(test->ops, test);
5730 if (hist_data->enable_timestamps) {
5731 if (!hist_data->remove || unregistered)
5732 tracing_set_filter_buffering(file->tr, false);
5736 static bool hist_file_check_refs(struct trace_event_file *file)
5738 struct hist_trigger_data *hist_data;
5739 struct event_trigger_data *test;
5741 lockdep_assert_held(&event_mutex);
5743 list_for_each_entry(test, &file->triggers, list) {
5744 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5745 hist_data = test->private_data;
5746 if (check_var_refs(hist_data))
5754 static void hist_unreg_all(struct trace_event_file *file)
5756 struct event_trigger_data *test, *n;
5757 struct hist_trigger_data *hist_data;
5758 struct synth_event *se;
5759 const char *se_name;
5761 lockdep_assert_held(&event_mutex);
5763 if (hist_file_check_refs(file))
5766 list_for_each_entry_safe(test, n, &file->triggers, list) {
5767 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5768 hist_data = test->private_data;
5769 list_del_rcu(&test->list);
5770 trace_event_trigger_enable_disable(file, 0);
5772 se_name = trace_event_name(file->event_call);
5773 se = find_synth_event(se_name);
5777 update_cond_flag(file);
5778 if (hist_data->enable_timestamps)
5779 tracing_set_filter_buffering(file->tr, false);
5780 if (test->ops->free)
5781 test->ops->free(test->ops, test);
5786 static int event_hist_trigger_func(struct event_command *cmd_ops,
5787 struct trace_event_file *file,
5788 char *glob, char *cmd, char *param)
5790 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
5791 struct event_trigger_data *trigger_data;
5792 struct hist_trigger_attrs *attrs;
5793 struct event_trigger_ops *trigger_ops;
5794 struct hist_trigger_data *hist_data;
5795 struct synth_event *se;
5796 const char *se_name;
5797 bool remove = false;
5801 lockdep_assert_held(&event_mutex);
5803 if (glob && strlen(glob)) {
5805 last_cmd_set(file, param);
5815 * separate the trigger from the filter (k:v [if filter])
5816 * allowing for whitespace in the trigger
5818 p = trigger = param;
5820 p = strstr(p, "if");
5825 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
5829 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
5831 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
5842 param = strstrip(p);
5843 trigger = strstrip(trigger);
5846 attrs = parse_hist_trigger_attrs(file->tr, trigger);
5848 return PTR_ERR(attrs);
5850 if (attrs->map_bits)
5851 hist_trigger_bits = attrs->map_bits;
5853 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
5854 if (IS_ERR(hist_data)) {
5855 destroy_hist_trigger_attrs(attrs);
5856 return PTR_ERR(hist_data);
5859 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
5861 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
5862 if (!trigger_data) {
5867 trigger_data->count = -1;
5868 trigger_data->ops = trigger_ops;
5869 trigger_data->cmd_ops = cmd_ops;
5871 INIT_LIST_HEAD(&trigger_data->list);
5872 RCU_INIT_POINTER(trigger_data->filter, NULL);
5874 trigger_data->private_data = hist_data;
5876 /* if param is non-empty, it's supposed to be a filter */
5877 if (param && cmd_ops->set_filter) {
5878 ret = cmd_ops->set_filter(param, trigger_data, file);
5884 if (!have_hist_trigger_match(trigger_data, file))
5887 if (hist_trigger_check_refs(trigger_data, file)) {
5892 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5893 se_name = trace_event_name(file->event_call);
5894 se = find_synth_event(se_name);
5901 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
5903 * The above returns on success the # of triggers registered,
5904 * but if it didn't register any it returns zero. Consider no
5905 * triggers registered a failure too.
5908 if (!(attrs->pause || attrs->cont || attrs->clear))
5914 if (get_named_trigger_data(trigger_data))
5917 if (has_hist_vars(hist_data))
5918 save_hist_vars(hist_data);
5920 ret = create_actions(hist_data);
5924 ret = tracing_map_init(hist_data->map);
5928 ret = hist_trigger_enable(trigger_data, file);
5932 se_name = trace_event_name(file->event_call);
5933 se = find_synth_event(se_name);
5936 /* Just return zero, not the number of registered triggers */
5944 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5946 if (cmd_ops->set_filter)
5947 cmd_ops->set_filter(NULL, trigger_data, NULL);
5949 remove_hist_vars(hist_data);
5951 kfree(trigger_data);
5953 destroy_hist_data(hist_data);
5957 static struct event_command trigger_hist_cmd = {
5959 .trigger_type = ETT_EVENT_HIST,
5960 .flags = EVENT_CMD_FL_NEEDS_REC,
5961 .func = event_hist_trigger_func,
5962 .reg = hist_register_trigger,
5963 .unreg = hist_unregister_trigger,
5964 .unreg_all = hist_unreg_all,
5965 .get_trigger_ops = event_hist_get_trigger_ops,
5966 .set_filter = set_trigger_filter,
5969 __init int register_trigger_hist_cmd(void)
5973 ret = register_event_command(&trigger_hist_cmd);
5980 hist_enable_trigger(struct event_trigger_data *data,
5981 struct trace_buffer *buffer, void *rec,
5982 struct ring_buffer_event *event)
5984 struct enable_trigger_data *enable_data = data->private_data;
5985 struct event_trigger_data *test;
5987 list_for_each_entry_rcu(test, &enable_data->file->triggers, list,
5988 lockdep_is_held(&event_mutex)) {
5989 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5990 if (enable_data->enable)
5991 test->paused = false;
5993 test->paused = true;
5999 hist_enable_count_trigger(struct event_trigger_data *data,
6000 struct trace_buffer *buffer, void *rec,
6001 struct ring_buffer_event *event)
6006 if (data->count != -1)
6009 hist_enable_trigger(data, buffer, rec, event);
6012 static struct event_trigger_ops hist_enable_trigger_ops = {
6013 .func = hist_enable_trigger,
6014 .print = event_enable_trigger_print,
6015 .init = event_trigger_init,
6016 .free = event_enable_trigger_free,
6019 static struct event_trigger_ops hist_enable_count_trigger_ops = {
6020 .func = hist_enable_count_trigger,
6021 .print = event_enable_trigger_print,
6022 .init = event_trigger_init,
6023 .free = event_enable_trigger_free,
6026 static struct event_trigger_ops hist_disable_trigger_ops = {
6027 .func = hist_enable_trigger,
6028 .print = event_enable_trigger_print,
6029 .init = event_trigger_init,
6030 .free = event_enable_trigger_free,
6033 static struct event_trigger_ops hist_disable_count_trigger_ops = {
6034 .func = hist_enable_count_trigger,
6035 .print = event_enable_trigger_print,
6036 .init = event_trigger_init,
6037 .free = event_enable_trigger_free,
6040 static struct event_trigger_ops *
6041 hist_enable_get_trigger_ops(char *cmd, char *param)
6043 struct event_trigger_ops *ops;
6046 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6049 ops = param ? &hist_enable_count_trigger_ops :
6050 &hist_enable_trigger_ops;
6052 ops = param ? &hist_disable_count_trigger_ops :
6053 &hist_disable_trigger_ops;
6058 static void hist_enable_unreg_all(struct trace_event_file *file)
6060 struct event_trigger_data *test, *n;
6062 list_for_each_entry_safe(test, n, &file->triggers, list) {
6063 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6064 list_del_rcu(&test->list);
6065 update_cond_flag(file);
6066 trace_event_trigger_enable_disable(file, 0);
6067 if (test->ops->free)
6068 test->ops->free(test->ops, test);
6073 static struct event_command trigger_hist_enable_cmd = {
6074 .name = ENABLE_HIST_STR,
6075 .trigger_type = ETT_HIST_ENABLE,
6076 .func = event_enable_trigger_func,
6077 .reg = event_enable_register_trigger,
6078 .unreg = event_enable_unregister_trigger,
6079 .unreg_all = hist_enable_unreg_all,
6080 .get_trigger_ops = hist_enable_get_trigger_ops,
6081 .set_filter = set_trigger_filter,
6084 static struct event_command trigger_hist_disable_cmd = {
6085 .name = DISABLE_HIST_STR,
6086 .trigger_type = ETT_HIST_ENABLE,
6087 .func = event_enable_trigger_func,
6088 .reg = event_enable_register_trigger,
6089 .unreg = event_enable_unregister_trigger,
6090 .unreg_all = hist_enable_unreg_all,
6091 .get_trigger_ops = hist_enable_get_trigger_ops,
6092 .set_filter = set_trigger_filter,
6095 static __init void unregister_trigger_hist_enable_disable_cmds(void)
6097 unregister_event_command(&trigger_hist_enable_cmd);
6098 unregister_event_command(&trigger_hist_disable_cmd);
6101 __init int register_trigger_hist_enable_disable_cmds(void)
6105 ret = register_event_command(&trigger_hist_enable_cmd);
6106 if (WARN_ON(ret < 0))
6108 ret = register_event_command(&trigger_hist_disable_cmd);
6109 if (WARN_ON(ret < 0))
6110 unregister_trigger_hist_enable_disable_cmds();