2 * trace_events_hist - trace event hist triggers
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
17 #include <linux/module.h>
18 #include <linux/kallsyms.h>
19 #include <linux/mutex.h>
20 #include <linux/slab.h>
21 #include <linux/stacktrace.h>
22 #include <linux/rculist.h>
23 #include <linux/tracefs.h>
25 #include "tracing_map.h"
28 #define SYNTH_SYSTEM "synthetic"
29 #define SYNTH_FIELDS_MAX 16
31 #define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
35 typedef u64 (*hist_field_fn_t) (struct hist_field *field,
36 struct tracing_map_elt *elt,
37 struct ring_buffer_event *rbe,
40 #define HIST_FIELD_OPERANDS_MAX 2
41 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
42 #define HIST_ACTIONS_MAX 8
53 struct hist_trigger_data *hist_data;
58 struct ftrace_event_field *field;
63 unsigned int is_signed;
65 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
66 struct hist_trigger_data *hist_data;
68 enum field_op_id operator;
73 unsigned int var_ref_idx;
77 static u64 hist_field_none(struct hist_field *field,
78 struct tracing_map_elt *elt,
79 struct ring_buffer_event *rbe,
85 static u64 hist_field_counter(struct hist_field *field,
86 struct tracing_map_elt *elt,
87 struct ring_buffer_event *rbe,
93 static u64 hist_field_string(struct hist_field *hist_field,
94 struct tracing_map_elt *elt,
95 struct ring_buffer_event *rbe,
98 char *addr = (char *)(event + hist_field->field->offset);
100 return (u64)(unsigned long)addr;
103 static u64 hist_field_dynstring(struct hist_field *hist_field,
104 struct tracing_map_elt *elt,
105 struct ring_buffer_event *rbe,
108 u32 str_item = *(u32 *)(event + hist_field->field->offset);
109 int str_loc = str_item & 0xffff;
110 char *addr = (char *)(event + str_loc);
112 return (u64)(unsigned long)addr;
115 static u64 hist_field_pstring(struct hist_field *hist_field,
116 struct tracing_map_elt *elt,
117 struct ring_buffer_event *rbe,
120 char **addr = (char **)(event + hist_field->field->offset);
122 return (u64)(unsigned long)*addr;
125 static u64 hist_field_log2(struct hist_field *hist_field,
126 struct tracing_map_elt *elt,
127 struct ring_buffer_event *rbe,
130 struct hist_field *operand = hist_field->operands[0];
132 u64 val = operand->fn(operand, elt, rbe, event);
134 return (u64) ilog2(roundup_pow_of_two(val));
137 static u64 hist_field_plus(struct hist_field *hist_field,
138 struct tracing_map_elt *elt,
139 struct ring_buffer_event *rbe,
142 struct hist_field *operand1 = hist_field->operands[0];
143 struct hist_field *operand2 = hist_field->operands[1];
145 u64 val1 = operand1->fn(operand1, elt, rbe, event);
146 u64 val2 = operand2->fn(operand2, elt, rbe, event);
151 static u64 hist_field_minus(struct hist_field *hist_field,
152 struct tracing_map_elt *elt,
153 struct ring_buffer_event *rbe,
156 struct hist_field *operand1 = hist_field->operands[0];
157 struct hist_field *operand2 = hist_field->operands[1];
159 u64 val1 = operand1->fn(operand1, elt, rbe, event);
160 u64 val2 = operand2->fn(operand2, elt, rbe, event);
165 static u64 hist_field_unary_minus(struct hist_field *hist_field,
166 struct tracing_map_elt *elt,
167 struct ring_buffer_event *rbe,
170 struct hist_field *operand = hist_field->operands[0];
172 s64 sval = (s64)operand->fn(operand, elt, rbe, event);
173 u64 val = (u64)-sval;
178 #define DEFINE_HIST_FIELD_FN(type) \
179 static u64 hist_field_##type(struct hist_field *hist_field, \
180 struct tracing_map_elt *elt, \
181 struct ring_buffer_event *rbe, \
184 type *addr = (type *)(event + hist_field->field->offset); \
186 return (u64)(unsigned long)*addr; \
189 DEFINE_HIST_FIELD_FN(s64);
190 DEFINE_HIST_FIELD_FN(u64);
191 DEFINE_HIST_FIELD_FN(s32);
192 DEFINE_HIST_FIELD_FN(u32);
193 DEFINE_HIST_FIELD_FN(s16);
194 DEFINE_HIST_FIELD_FN(u16);
195 DEFINE_HIST_FIELD_FN(s8);
196 DEFINE_HIST_FIELD_FN(u8);
198 #define for_each_hist_field(i, hist_data) \
199 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
201 #define for_each_hist_val_field(i, hist_data) \
202 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
204 #define for_each_hist_key_field(i, hist_data) \
205 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
207 #define HIST_STACKTRACE_DEPTH 16
208 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
209 #define HIST_STACKTRACE_SKIP 5
211 #define HITCOUNT_IDX 0
212 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
214 enum hist_field_flags {
215 HIST_FIELD_FL_HITCOUNT = 1 << 0,
216 HIST_FIELD_FL_KEY = 1 << 1,
217 HIST_FIELD_FL_STRING = 1 << 2,
218 HIST_FIELD_FL_HEX = 1 << 3,
219 HIST_FIELD_FL_SYM = 1 << 4,
220 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
221 HIST_FIELD_FL_EXECNAME = 1 << 6,
222 HIST_FIELD_FL_SYSCALL = 1 << 7,
223 HIST_FIELD_FL_STACKTRACE = 1 << 8,
224 HIST_FIELD_FL_LOG2 = 1 << 9,
225 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
226 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
227 HIST_FIELD_FL_VAR = 1 << 12,
228 HIST_FIELD_FL_EXPR = 1 << 13,
229 HIST_FIELD_FL_VAR_REF = 1 << 14,
230 HIST_FIELD_FL_CPU = 1 << 15,
231 HIST_FIELD_FL_ALIAS = 1 << 16,
236 char *name[TRACING_MAP_VARS_MAX];
237 char *expr[TRACING_MAP_VARS_MAX];
240 struct hist_trigger_attrs {
250 unsigned int map_bits;
252 char *assignment_str[TRACING_MAP_VARS_MAX];
253 unsigned int n_assignments;
255 char *action_str[HIST_ACTIONS_MAX];
256 unsigned int n_actions;
258 struct var_defs var_defs;
262 struct hist_field *var;
263 struct hist_field *val;
266 struct field_var_hist {
267 struct hist_trigger_data *hist_data;
271 struct hist_trigger_data {
272 struct hist_field *fields[HIST_FIELDS_MAX];
275 unsigned int n_fields;
277 unsigned int key_size;
278 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
279 unsigned int n_sort_keys;
280 struct trace_event_file *event_file;
281 struct hist_trigger_attrs *attrs;
282 struct tracing_map *map;
283 bool enable_timestamps;
285 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
286 unsigned int n_var_refs;
288 struct action_data *actions[HIST_ACTIONS_MAX];
289 unsigned int n_actions;
291 struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX];
292 unsigned int n_synth_var_refs;
293 struct field_var *field_vars[SYNTH_FIELDS_MAX];
294 unsigned int n_field_vars;
295 unsigned int n_field_var_str;
296 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
297 unsigned int n_field_var_hists;
299 struct field_var *max_vars[SYNTH_FIELDS_MAX];
300 unsigned int n_max_vars;
301 unsigned int n_max_var_str;
313 struct list_head list;
316 struct synth_field **fields;
317 unsigned int n_fields;
319 struct trace_event_class class;
320 struct trace_event_call call;
321 struct tracepoint *tp;
326 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
327 struct tracing_map_elt *elt, void *rec,
328 struct ring_buffer_event *rbe,
329 struct action_data *data, u64 *var_ref_vals);
333 unsigned int n_params;
334 char *params[SYNTH_FIELDS_MAX];
338 unsigned int var_ref_idx;
340 char *match_event_system;
341 char *synth_event_name;
342 struct synth_event *synth_event;
348 unsigned int max_var_ref_idx;
349 struct hist_field *max_var;
350 struct hist_field *var;
356 static char last_hist_cmd[MAX_FILTER_STR_VAL];
357 static char hist_err_str[MAX_FILTER_STR_VAL];
359 static void last_cmd_set(char *str)
364 strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
367 static void hist_err(char *str, char *var)
369 int maxlen = MAX_FILTER_STR_VAL - 1;
374 if (strlen(hist_err_str))
380 if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
383 strcat(hist_err_str, str);
384 strcat(hist_err_str, var);
387 static void hist_err_event(char *str, char *system, char *event, char *var)
389 char err[MAX_FILTER_STR_VAL];
392 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var);
394 snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
396 strscpy(err, var, MAX_FILTER_STR_VAL);
401 static void hist_err_clear(void)
403 hist_err_str[0] = '\0';
406 static bool have_hist_err(void)
408 if (strlen(hist_err_str))
414 static LIST_HEAD(synth_event_list);
415 static DEFINE_MUTEX(synth_event_mutex);
417 struct synth_trace_event {
418 struct trace_entry ent;
422 static int synth_event_define_fields(struct trace_event_call *call)
424 struct synth_trace_event trace;
425 int offset = offsetof(typeof(trace), fields);
426 struct synth_event *event = call->data;
427 unsigned int i, size, n_u64;
432 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
433 size = event->fields[i]->size;
434 is_signed = event->fields[i]->is_signed;
435 type = event->fields[i]->type;
436 name = event->fields[i]->name;
437 ret = trace_define_field(call, type, name, offset, size,
438 is_signed, FILTER_OTHER);
442 if (event->fields[i]->is_string) {
443 offset += STR_VAR_LEN_MAX;
444 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
446 offset += sizeof(u64);
451 event->n_u64 = n_u64;
456 static bool synth_field_signed(char *type)
458 if (strncmp(type, "u", 1) == 0)
464 static int synth_field_is_string(char *type)
466 if (strstr(type, "char[") != NULL)
472 static int synth_field_string_size(char *type)
474 char buf[4], *end, *start;
478 start = strstr(type, "char[");
481 start += strlen("char[");
483 end = strchr(type, ']');
484 if (!end || end < start)
491 strncpy(buf, start, len);
494 err = kstrtouint(buf, 0, &size);
498 if (size > STR_VAR_LEN_MAX)
504 static int synth_field_size(char *type)
508 if (strcmp(type, "s64") == 0)
510 else if (strcmp(type, "u64") == 0)
512 else if (strcmp(type, "s32") == 0)
514 else if (strcmp(type, "u32") == 0)
516 else if (strcmp(type, "s16") == 0)
518 else if (strcmp(type, "u16") == 0)
520 else if (strcmp(type, "s8") == 0)
522 else if (strcmp(type, "u8") == 0)
524 else if (strcmp(type, "char") == 0)
526 else if (strcmp(type, "unsigned char") == 0)
527 size = sizeof(unsigned char);
528 else if (strcmp(type, "int") == 0)
530 else if (strcmp(type, "unsigned int") == 0)
531 size = sizeof(unsigned int);
532 else if (strcmp(type, "long") == 0)
534 else if (strcmp(type, "unsigned long") == 0)
535 size = sizeof(unsigned long);
536 else if (strcmp(type, "pid_t") == 0)
537 size = sizeof(pid_t);
538 else if (synth_field_is_string(type))
539 size = synth_field_string_size(type);
544 static const char *synth_field_fmt(char *type)
546 const char *fmt = "%llu";
548 if (strcmp(type, "s64") == 0)
550 else if (strcmp(type, "u64") == 0)
552 else if (strcmp(type, "s32") == 0)
554 else if (strcmp(type, "u32") == 0)
556 else if (strcmp(type, "s16") == 0)
558 else if (strcmp(type, "u16") == 0)
560 else if (strcmp(type, "s8") == 0)
562 else if (strcmp(type, "u8") == 0)
564 else if (strcmp(type, "char") == 0)
566 else if (strcmp(type, "unsigned char") == 0)
568 else if (strcmp(type, "int") == 0)
570 else if (strcmp(type, "unsigned int") == 0)
572 else if (strcmp(type, "long") == 0)
574 else if (strcmp(type, "unsigned long") == 0)
576 else if (strcmp(type, "pid_t") == 0)
578 else if (synth_field_is_string(type))
584 static enum print_line_t print_synth_event(struct trace_iterator *iter,
586 struct trace_event *event)
588 struct trace_array *tr = iter->tr;
589 struct trace_seq *s = &iter->seq;
590 struct synth_trace_event *entry;
591 struct synth_event *se;
592 unsigned int i, n_u64;
596 entry = (struct synth_trace_event *)iter->ent;
597 se = container_of(event, struct synth_event, call.event);
599 trace_seq_printf(s, "%s: ", se->name);
601 for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
602 if (trace_seq_has_overflowed(s))
605 fmt = synth_field_fmt(se->fields[i]->type);
607 /* parameter types */
608 if (tr->trace_flags & TRACE_ITER_VERBOSE)
609 trace_seq_printf(s, "%s ", fmt);
611 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
613 /* parameter values */
614 if (se->fields[i]->is_string) {
615 trace_seq_printf(s, print_fmt, se->fields[i]->name,
616 (char *)&entry->fields[n_u64],
617 i == se->n_fields - 1 ? "" : " ");
618 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
620 trace_seq_printf(s, print_fmt, se->fields[i]->name,
621 entry->fields[n_u64],
622 i == se->n_fields - 1 ? "" : " ");
627 trace_seq_putc(s, '\n');
629 return trace_handle_return(s);
632 static struct trace_event_functions synth_event_funcs = {
633 .trace = print_synth_event
636 static notrace void trace_event_raw_event_synth(void *__data,
638 unsigned int var_ref_idx)
640 struct trace_event_file *trace_file = __data;
641 struct synth_trace_event *entry;
642 struct trace_event_buffer fbuffer;
643 struct ring_buffer *buffer;
644 struct synth_event *event;
645 unsigned int i, n_u64;
648 event = trace_file->event_call->data;
650 if (trace_trigger_soft_disabled(trace_file))
653 fields_size = event->n_u64 * sizeof(u64);
656 * Avoid ring buffer recursion detection, as this event
657 * is being performed within another event.
659 buffer = trace_file->tr->trace_buffer.buffer;
660 ring_buffer_nest_start(buffer);
662 entry = trace_event_buffer_reserve(&fbuffer, trace_file,
663 sizeof(*entry) + fields_size);
667 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
668 if (event->fields[i]->is_string) {
669 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
670 char *str_field = (char *)&entry->fields[n_u64];
672 strscpy(str_field, str_val, STR_VAR_LEN_MAX);
673 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
675 entry->fields[n_u64] = var_ref_vals[var_ref_idx + i];
680 trace_event_buffer_commit(&fbuffer);
682 ring_buffer_nest_end(buffer);
685 static void free_synth_event_print_fmt(struct trace_event_call *call)
688 kfree(call->print_fmt);
689 call->print_fmt = NULL;
693 static int __set_synth_event_print_fmt(struct synth_event *event,
700 /* When len=0, we just calculate the needed length */
701 #define LEN_OR_ZERO (len ? len - pos : 0)
703 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
704 for (i = 0; i < event->n_fields; i++) {
705 fmt = synth_field_fmt(event->fields[i]->type);
706 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
707 event->fields[i]->name, fmt,
708 i == event->n_fields - 1 ? "" : ", ");
710 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
712 for (i = 0; i < event->n_fields; i++) {
713 pos += snprintf(buf + pos, LEN_OR_ZERO,
714 ", REC->%s", event->fields[i]->name);
719 /* return the length of print_fmt */
723 static int set_synth_event_print_fmt(struct trace_event_call *call)
725 struct synth_event *event = call->data;
729 /* First: called with 0 length to calculate the needed length */
730 len = __set_synth_event_print_fmt(event, NULL, 0);
732 print_fmt = kmalloc(len + 1, GFP_KERNEL);
736 /* Second: actually write the @print_fmt */
737 __set_synth_event_print_fmt(event, print_fmt, len + 1);
738 call->print_fmt = print_fmt;
743 static void free_synth_field(struct synth_field *field)
750 static struct synth_field *parse_synth_field(char *field_type,
753 struct synth_field *field;
757 if (field_type[0] == ';')
760 len = strlen(field_name);
761 if (field_name[len - 1] == ';')
762 field_name[len - 1] = '\0';
764 field = kzalloc(sizeof(*field), GFP_KERNEL);
766 return ERR_PTR(-ENOMEM);
768 len = strlen(field_type) + 1;
769 array = strchr(field_name, '[');
771 len += strlen(array);
772 field->type = kzalloc(len, GFP_KERNEL);
777 strcat(field->type, field_type);
779 strcat(field->type, array);
783 field->size = synth_field_size(field->type);
789 if (synth_field_is_string(field->type))
790 field->is_string = true;
792 field->is_signed = synth_field_signed(field->type);
794 field->name = kstrdup(field_name, GFP_KERNEL);
802 free_synth_field(field);
803 field = ERR_PTR(ret);
807 static void free_synth_tracepoint(struct tracepoint *tp)
816 static struct tracepoint *alloc_synth_tracepoint(char *name)
818 struct tracepoint *tp;
820 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
822 return ERR_PTR(-ENOMEM);
824 tp->name = kstrdup(name, GFP_KERNEL);
827 return ERR_PTR(-ENOMEM);
833 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
834 unsigned int var_ref_idx);
836 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
837 unsigned int var_ref_idx)
839 struct tracepoint *tp = event->tp;
841 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
842 struct tracepoint_func *probe_func_ptr;
843 synth_probe_func_t probe_func;
846 if (!(cpu_online(raw_smp_processor_id())))
849 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
850 if (probe_func_ptr) {
852 probe_func = probe_func_ptr->func;
853 __data = probe_func_ptr->data;
854 probe_func(__data, var_ref_vals, var_ref_idx);
855 } while ((++probe_func_ptr)->func);
860 static struct synth_event *find_synth_event(const char *name)
862 struct synth_event *event;
864 list_for_each_entry(event, &synth_event_list, list) {
865 if (strcmp(event->name, name) == 0)
872 static int register_synth_event(struct synth_event *event)
874 struct trace_event_call *call = &event->call;
877 event->call.class = &event->class;
878 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
879 if (!event->class.system) {
884 event->tp = alloc_synth_tracepoint(event->name);
885 if (IS_ERR(event->tp)) {
886 ret = PTR_ERR(event->tp);
891 INIT_LIST_HEAD(&call->class->fields);
892 call->event.funcs = &synth_event_funcs;
893 call->class->define_fields = synth_event_define_fields;
895 ret = register_trace_event(&call->event);
900 call->flags = TRACE_EVENT_FL_TRACEPOINT;
901 call->class->reg = trace_event_reg;
902 call->class->probe = trace_event_raw_event_synth;
904 call->tp = event->tp;
906 ret = trace_add_event_call(call);
908 pr_warn("Failed to register synthetic event: %s\n",
909 trace_event_name(call));
913 ret = set_synth_event_print_fmt(call);
915 trace_remove_event_call(call);
921 unregister_trace_event(&call->event);
925 static int unregister_synth_event(struct synth_event *event)
927 struct trace_event_call *call = &event->call;
930 ret = trace_remove_event_call(call);
935 static void free_synth_event(struct synth_event *event)
942 for (i = 0; i < event->n_fields; i++)
943 free_synth_field(event->fields[i]);
945 kfree(event->fields);
947 kfree(event->class.system);
948 free_synth_tracepoint(event->tp);
949 free_synth_event_print_fmt(&event->call);
953 static struct synth_event *alloc_synth_event(char *event_name, int n_fields,
954 struct synth_field **fields)
956 struct synth_event *event;
959 event = kzalloc(sizeof(*event), GFP_KERNEL);
961 event = ERR_PTR(-ENOMEM);
965 event->name = kstrdup(event_name, GFP_KERNEL);
968 event = ERR_PTR(-ENOMEM);
972 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
973 if (!event->fields) {
974 free_synth_event(event);
975 event = ERR_PTR(-ENOMEM);
979 for (i = 0; i < n_fields; i++)
980 event->fields[i] = fields[i];
982 event->n_fields = n_fields;
987 static void action_trace(struct hist_trigger_data *hist_data,
988 struct tracing_map_elt *elt, void *rec,
989 struct ring_buffer_event *rbe,
990 struct action_data *data, u64 *var_ref_vals)
992 struct synth_event *event = data->onmatch.synth_event;
994 trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx);
997 struct hist_var_data {
998 struct list_head list;
999 struct hist_trigger_data *hist_data;
1002 static void add_or_delete_synth_event(struct synth_event *event, int delete)
1005 free_synth_event(event);
1007 mutex_lock(&synth_event_mutex);
1008 if (!find_synth_event(event->name))
1009 list_add(&event->list, &synth_event_list);
1011 free_synth_event(event);
1012 mutex_unlock(&synth_event_mutex);
1016 static int create_synth_event(int argc, char **argv)
1018 struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
1019 struct synth_event *event = NULL;
1020 bool delete_event = false;
1021 int i, n_fields = 0, ret = 0;
1024 mutex_lock(&synth_event_mutex);
1028 * - Add synthetic event: <event_name> field[;field] ...
1029 * - Remove synthetic event: !<event_name> field[;field] ...
1030 * where 'field' = type field_name
1038 if (name[0] == '!') {
1039 delete_event = true;
1043 event = find_synth_event(name);
1051 list_del(&event->list);
1057 } else if (delete_event)
1065 for (i = 1; i < argc - 1; i++) {
1066 if (strcmp(argv[i], ";") == 0)
1068 if (n_fields == SYNTH_FIELDS_MAX) {
1073 field = parse_synth_field(argv[i], argv[i + 1]);
1074 if (IS_ERR(field)) {
1075 ret = PTR_ERR(field);
1078 fields[n_fields] = field;
1087 event = alloc_synth_event(name, n_fields, fields);
1088 if (IS_ERR(event)) {
1089 ret = PTR_ERR(event);
1094 mutex_unlock(&synth_event_mutex);
1098 ret = unregister_synth_event(event);
1099 add_or_delete_synth_event(event, !ret);
1101 ret = register_synth_event(event);
1102 add_or_delete_synth_event(event, ret);
1108 mutex_unlock(&synth_event_mutex);
1110 for (i = 0; i < n_fields; i++)
1111 free_synth_field(fields[i]);
1112 free_synth_event(event);
1117 static int release_all_synth_events(void)
1119 struct list_head release_events;
1120 struct synth_event *event, *e;
1123 INIT_LIST_HEAD(&release_events);
1125 mutex_lock(&synth_event_mutex);
1127 list_for_each_entry(event, &synth_event_list, list) {
1129 mutex_unlock(&synth_event_mutex);
1134 list_splice_init(&event->list, &release_events);
1136 mutex_unlock(&synth_event_mutex);
1138 list_for_each_entry_safe(event, e, &release_events, list) {
1139 list_del(&event->list);
1141 ret = unregister_synth_event(event);
1142 add_or_delete_synth_event(event, !ret);
1149 static void *synth_events_seq_start(struct seq_file *m, loff_t *pos)
1151 mutex_lock(&synth_event_mutex);
1153 return seq_list_start(&synth_event_list, *pos);
1156 static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos)
1158 return seq_list_next(v, &synth_event_list, pos);
1161 static void synth_events_seq_stop(struct seq_file *m, void *v)
1163 mutex_unlock(&synth_event_mutex);
1166 static int synth_events_seq_show(struct seq_file *m, void *v)
1168 struct synth_field *field;
1169 struct synth_event *event = v;
1172 seq_printf(m, "%s\t", event->name);
1174 for (i = 0; i < event->n_fields; i++) {
1175 field = event->fields[i];
1177 /* parameter values */
1178 seq_printf(m, "%s %s%s", field->type, field->name,
1179 i == event->n_fields - 1 ? "" : "; ");
1187 static const struct seq_operations synth_events_seq_op = {
1188 .start = synth_events_seq_start,
1189 .next = synth_events_seq_next,
1190 .stop = synth_events_seq_stop,
1191 .show = synth_events_seq_show
1194 static int synth_events_open(struct inode *inode, struct file *file)
1198 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
1199 ret = release_all_synth_events();
1204 return seq_open(file, &synth_events_seq_op);
1207 static ssize_t synth_events_write(struct file *file,
1208 const char __user *buffer,
1209 size_t count, loff_t *ppos)
1211 return trace_parse_run_command(file, buffer, count, ppos,
1212 create_synth_event);
1215 static const struct file_operations synth_events_fops = {
1216 .open = synth_events_open,
1217 .write = synth_events_write,
1219 .llseek = seq_lseek,
1220 .release = seq_release,
1223 static u64 hist_field_timestamp(struct hist_field *hist_field,
1224 struct tracing_map_elt *elt,
1225 struct ring_buffer_event *rbe,
1228 struct hist_trigger_data *hist_data = hist_field->hist_data;
1229 struct trace_array *tr = hist_data->event_file->tr;
1231 u64 ts = ring_buffer_event_time_stamp(rbe);
1233 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
1239 static u64 hist_field_cpu(struct hist_field *hist_field,
1240 struct tracing_map_elt *elt,
1241 struct ring_buffer_event *rbe,
1244 int cpu = smp_processor_id();
1249 static struct hist_field *
1250 check_field_for_var_ref(struct hist_field *hist_field,
1251 struct hist_trigger_data *var_data,
1252 unsigned int var_idx)
1254 struct hist_field *found = NULL;
1256 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) {
1257 if (hist_field->var.idx == var_idx &&
1258 hist_field->var.hist_data == var_data) {
1266 static struct hist_field *
1267 check_field_for_var_refs(struct hist_trigger_data *hist_data,
1268 struct hist_field *hist_field,
1269 struct hist_trigger_data *var_data,
1270 unsigned int var_idx,
1273 struct hist_field *found = NULL;
1282 found = check_field_for_var_ref(hist_field, var_data, var_idx);
1286 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1287 struct hist_field *operand;
1289 operand = hist_field->operands[i];
1290 found = check_field_for_var_refs(hist_data, operand, var_data,
1291 var_idx, level + 1);
1299 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
1300 struct hist_trigger_data *var_data,
1301 unsigned int var_idx)
1303 struct hist_field *hist_field, *found = NULL;
1306 for_each_hist_field(i, hist_data) {
1307 hist_field = hist_data->fields[i];
1308 found = check_field_for_var_refs(hist_data, hist_field,
1309 var_data, var_idx, 0);
1314 for (i = 0; i < hist_data->n_synth_var_refs; i++) {
1315 hist_field = hist_data->synth_var_refs[i];
1316 found = check_field_for_var_refs(hist_data, hist_field,
1317 var_data, var_idx, 0);
1325 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
1326 unsigned int var_idx)
1328 struct trace_array *tr = hist_data->event_file->tr;
1329 struct hist_field *found = NULL;
1330 struct hist_var_data *var_data;
1332 list_for_each_entry(var_data, &tr->hist_vars, list) {
1333 if (var_data->hist_data == hist_data)
1335 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
1343 static bool check_var_refs(struct hist_trigger_data *hist_data)
1345 struct hist_field *field;
1349 for_each_hist_field(i, hist_data) {
1350 field = hist_data->fields[i];
1351 if (field && field->flags & HIST_FIELD_FL_VAR) {
1352 if (find_any_var_ref(hist_data, field->var.idx)) {
1362 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1364 struct trace_array *tr = hist_data->event_file->tr;
1365 struct hist_var_data *var_data, *found = NULL;
1367 list_for_each_entry(var_data, &tr->hist_vars, list) {
1368 if (var_data->hist_data == hist_data) {
1377 static bool field_has_hist_vars(struct hist_field *hist_field,
1388 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1389 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1392 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1393 struct hist_field *operand;
1395 operand = hist_field->operands[i];
1396 if (field_has_hist_vars(operand, level + 1))
1403 static bool has_hist_vars(struct hist_trigger_data *hist_data)
1405 struct hist_field *hist_field;
1408 for_each_hist_field(i, hist_data) {
1409 hist_field = hist_data->fields[i];
1410 if (field_has_hist_vars(hist_field, 0))
1417 static int save_hist_vars(struct hist_trigger_data *hist_data)
1419 struct trace_array *tr = hist_data->event_file->tr;
1420 struct hist_var_data *var_data;
1422 var_data = find_hist_vars(hist_data);
1426 if (trace_array_get(tr) < 0)
1429 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1431 trace_array_put(tr);
1435 var_data->hist_data = hist_data;
1436 list_add(&var_data->list, &tr->hist_vars);
1441 static void remove_hist_vars(struct hist_trigger_data *hist_data)
1443 struct trace_array *tr = hist_data->event_file->tr;
1444 struct hist_var_data *var_data;
1446 var_data = find_hist_vars(hist_data);
1450 if (WARN_ON(check_var_refs(hist_data)))
1453 list_del(&var_data->list);
1457 trace_array_put(tr);
1460 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1461 const char *var_name)
1463 struct hist_field *hist_field, *found = NULL;
1466 for_each_hist_field(i, hist_data) {
1467 hist_field = hist_data->fields[i];
1468 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1469 strcmp(hist_field->var.name, var_name) == 0) {
1478 static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1479 struct trace_event_file *file,
1480 const char *var_name)
1482 struct hist_trigger_data *test_data;
1483 struct event_trigger_data *test;
1484 struct hist_field *hist_field;
1486 hist_field = find_var_field(hist_data, var_name);
1490 list_for_each_entry_rcu(test, &file->triggers, list) {
1491 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1492 test_data = test->private_data;
1493 hist_field = find_var_field(test_data, var_name);
1502 static struct trace_event_file *find_var_file(struct trace_array *tr,
1507 struct hist_trigger_data *var_hist_data;
1508 struct hist_var_data *var_data;
1509 struct trace_event_file *file, *found = NULL;
1512 return find_event_file(tr, system, event_name);
1514 list_for_each_entry(var_data, &tr->hist_vars, list) {
1515 var_hist_data = var_data->hist_data;
1516 file = var_hist_data->event_file;
1520 if (find_var_field(var_hist_data, var_name)) {
1522 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
1533 static struct hist_field *find_file_var(struct trace_event_file *file,
1534 const char *var_name)
1536 struct hist_trigger_data *test_data;
1537 struct event_trigger_data *test;
1538 struct hist_field *hist_field;
1540 list_for_each_entry_rcu(test, &file->triggers, list) {
1541 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1542 test_data = test->private_data;
1543 hist_field = find_var_field(test_data, var_name);
1552 static struct hist_field *
1553 find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1555 struct trace_array *tr = hist_data->event_file->tr;
1556 struct hist_field *hist_field, *found = NULL;
1557 struct trace_event_file *file;
1560 for (i = 0; i < hist_data->n_actions; i++) {
1561 struct action_data *data = hist_data->actions[i];
1563 if (data->fn == action_trace) {
1564 char *system = data->onmatch.match_event_system;
1565 char *event_name = data->onmatch.match_event;
1567 file = find_var_file(tr, system, event_name, var_name);
1570 hist_field = find_file_var(file, var_name);
1573 hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
1574 return ERR_PTR(-EINVAL);
1584 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1589 struct trace_array *tr = hist_data->event_file->tr;
1590 struct hist_field *hist_field = NULL;
1591 struct trace_event_file *file;
1593 if (!system || !event_name) {
1594 hist_field = find_match_var(hist_data, var_name);
1595 if (IS_ERR(hist_field))
1601 file = find_var_file(tr, system, event_name, var_name);
1605 hist_field = find_file_var(file, var_name);
1610 struct hist_elt_data {
1613 char *field_var_str[SYNTH_FIELDS_MAX];
1616 static u64 hist_field_var_ref(struct hist_field *hist_field,
1617 struct tracing_map_elt *elt,
1618 struct ring_buffer_event *rbe,
1621 struct hist_elt_data *elt_data;
1624 elt_data = elt->private_data;
1625 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1630 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1631 u64 *var_ref_vals, bool self)
1633 struct hist_trigger_data *var_data;
1634 struct tracing_map_elt *var_elt;
1635 struct hist_field *hist_field;
1636 unsigned int i, var_idx;
1637 bool resolved = true;
1640 for (i = 0; i < hist_data->n_var_refs; i++) {
1641 hist_field = hist_data->var_refs[i];
1642 var_idx = hist_field->var.idx;
1643 var_data = hist_field->var.hist_data;
1645 if (var_data == NULL) {
1650 if ((self && var_data != hist_data) ||
1651 (!self && var_data == hist_data))
1654 var_elt = tracing_map_lookup(var_data->map, key);
1660 if (!tracing_map_var_set(var_elt, var_idx)) {
1665 if (self || !hist_field->read_once)
1666 var_val = tracing_map_read_var(var_elt, var_idx);
1668 var_val = tracing_map_read_var_once(var_elt, var_idx);
1670 var_ref_vals[i] = var_val;
1676 static const char *hist_field_name(struct hist_field *field,
1679 const char *field_name = "";
1685 field_name = field->field->name;
1686 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1687 field->flags & HIST_FIELD_FL_ALIAS)
1688 field_name = hist_field_name(field->operands[0], ++level);
1689 else if (field->flags & HIST_FIELD_FL_CPU)
1691 else if (field->flags & HIST_FIELD_FL_EXPR ||
1692 field->flags & HIST_FIELD_FL_VAR_REF) {
1693 if (field->system) {
1694 static char full_name[MAX_FILTER_STR_VAL];
1696 strcat(full_name, field->system);
1697 strcat(full_name, ".");
1698 strcat(full_name, field->event_name);
1699 strcat(full_name, ".");
1700 strcat(full_name, field->name);
1701 field_name = full_name;
1703 field_name = field->name;
1704 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1705 field_name = "common_timestamp";
1707 if (field_name == NULL)
1713 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1715 hist_field_fn_t fn = NULL;
1717 switch (field_size) {
1719 if (field_is_signed)
1720 fn = hist_field_s64;
1722 fn = hist_field_u64;
1725 if (field_is_signed)
1726 fn = hist_field_s32;
1728 fn = hist_field_u32;
1731 if (field_is_signed)
1732 fn = hist_field_s16;
1734 fn = hist_field_u16;
1737 if (field_is_signed)
1747 static int parse_map_size(char *str)
1749 unsigned long size, map_bits;
1758 ret = kstrtoul(str, 0, &size);
1762 map_bits = ilog2(roundup_pow_of_two(size));
1763 if (map_bits < TRACING_MAP_BITS_MIN ||
1764 map_bits > TRACING_MAP_BITS_MAX)
1772 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
1779 for (i = 0; i < attrs->n_assignments; i++)
1780 kfree(attrs->assignment_str[i]);
1782 for (i = 0; i < attrs->n_actions; i++)
1783 kfree(attrs->action_str[i]);
1786 kfree(attrs->sort_key_str);
1787 kfree(attrs->keys_str);
1788 kfree(attrs->vals_str);
1789 kfree(attrs->clock);
1793 static int parse_action(char *str, struct hist_trigger_attrs *attrs)
1797 if (attrs->n_actions >= HIST_ACTIONS_MAX)
1800 if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) ||
1801 (strncmp(str, "onmax(", strlen("onmax(")) == 0)) {
1802 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
1803 if (!attrs->action_str[attrs->n_actions]) {
1814 static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
1818 if ((strncmp(str, "key=", strlen("key=")) == 0) ||
1819 (strncmp(str, "keys=", strlen("keys=")) == 0)) {
1820 attrs->keys_str = kstrdup(str, GFP_KERNEL);
1821 if (!attrs->keys_str) {
1825 } else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
1826 (strncmp(str, "vals=", strlen("vals=")) == 0) ||
1827 (strncmp(str, "values=", strlen("values=")) == 0)) {
1828 attrs->vals_str = kstrdup(str, GFP_KERNEL);
1829 if (!attrs->vals_str) {
1833 } else if (strncmp(str, "sort=", strlen("sort=")) == 0) {
1834 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
1835 if (!attrs->sort_key_str) {
1839 } else if (strncmp(str, "name=", strlen("name=")) == 0) {
1840 attrs->name = kstrdup(str, GFP_KERNEL);
1845 } else if (strncmp(str, "clock=", strlen("clock=")) == 0) {
1852 str = strstrip(str);
1853 attrs->clock = kstrdup(str, GFP_KERNEL);
1854 if (!attrs->clock) {
1858 } else if (strncmp(str, "size=", strlen("size=")) == 0) {
1859 int map_bits = parse_map_size(str);
1865 attrs->map_bits = map_bits;
1869 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
1870 hist_err("Too many variables defined: ", str);
1875 assignment = kstrdup(str, GFP_KERNEL);
1881 attrs->assignment_str[attrs->n_assignments++] = assignment;
1887 static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
1889 struct hist_trigger_attrs *attrs;
1892 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1894 return ERR_PTR(-ENOMEM);
1896 while (trigger_str) {
1897 char *str = strsep(&trigger_str, ":");
1899 if (strchr(str, '=')) {
1900 ret = parse_assignment(str, attrs);
1903 } else if (strcmp(str, "pause") == 0)
1904 attrs->pause = true;
1905 else if ((strcmp(str, "cont") == 0) ||
1906 (strcmp(str, "continue") == 0))
1908 else if (strcmp(str, "clear") == 0)
1909 attrs->clear = true;
1911 ret = parse_action(str, attrs);
1917 if (!attrs->keys_str) {
1922 if (!attrs->clock) {
1923 attrs->clock = kstrdup("global", GFP_KERNEL);
1924 if (!attrs->clock) {
1932 destroy_hist_trigger_attrs(attrs);
1934 return ERR_PTR(ret);
1937 static inline void save_comm(char *comm, struct task_struct *task)
1940 strcpy(comm, "<idle>");
1944 if (WARN_ON_ONCE(task->pid < 0)) {
1945 strcpy(comm, "<XXX>");
1949 memcpy(comm, task->comm, TASK_COMM_LEN);
1952 static void hist_elt_data_free(struct hist_elt_data *elt_data)
1956 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
1957 kfree(elt_data->field_var_str[i]);
1959 kfree(elt_data->comm);
1963 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
1965 struct hist_elt_data *elt_data = elt->private_data;
1967 hist_elt_data_free(elt_data);
1970 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
1972 struct hist_trigger_data *hist_data = elt->map->private_data;
1973 unsigned int size = TASK_COMM_LEN;
1974 struct hist_elt_data *elt_data;
1975 struct hist_field *key_field;
1976 unsigned int i, n_str;
1978 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
1982 for_each_hist_key_field(i, hist_data) {
1983 key_field = hist_data->fields[i];
1985 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
1986 elt_data->comm = kzalloc(size, GFP_KERNEL);
1987 if (!elt_data->comm) {
1995 n_str = hist_data->n_field_var_str + hist_data->n_max_var_str;
1997 size = STR_VAR_LEN_MAX;
1999 for (i = 0; i < n_str; i++) {
2000 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
2001 if (!elt_data->field_var_str[i]) {
2002 hist_elt_data_free(elt_data);
2007 elt->private_data = elt_data;
2012 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
2014 struct hist_elt_data *elt_data = elt->private_data;
2017 save_comm(elt_data->comm, current);
2020 static const struct tracing_map_ops hist_trigger_elt_data_ops = {
2021 .elt_alloc = hist_trigger_elt_data_alloc,
2022 .elt_free = hist_trigger_elt_data_free,
2023 .elt_init = hist_trigger_elt_data_init,
2026 static const char *get_hist_field_flags(struct hist_field *hist_field)
2028 const char *flags_str = NULL;
2030 if (hist_field->flags & HIST_FIELD_FL_HEX)
2032 else if (hist_field->flags & HIST_FIELD_FL_SYM)
2034 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
2035 flags_str = "sym-offset";
2036 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
2037 flags_str = "execname";
2038 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
2039 flags_str = "syscall";
2040 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
2042 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2043 flags_str = "usecs";
2048 static void expr_field_str(struct hist_field *field, char *expr)
2050 if (field->flags & HIST_FIELD_FL_VAR_REF)
2053 strcat(expr, hist_field_name(field, 0));
2055 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
2056 const char *flags_str = get_hist_field_flags(field);
2060 strcat(expr, flags_str);
2065 static char *expr_str(struct hist_field *field, unsigned int level)
2072 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2076 if (!field->operands[0]) {
2077 expr_field_str(field, expr);
2081 if (field->operator == FIELD_OP_UNARY_MINUS) {
2085 subexpr = expr_str(field->operands[0], ++level);
2090 strcat(expr, subexpr);
2098 expr_field_str(field->operands[0], expr);
2100 switch (field->operator) {
2101 case FIELD_OP_MINUS:
2112 expr_field_str(field->operands[1], expr);
2117 static int contains_operator(char *str)
2119 enum field_op_id field_op = FIELD_OP_NONE;
2122 op = strpbrk(str, "+-");
2124 return FIELD_OP_NONE;
2129 field_op = FIELD_OP_UNARY_MINUS;
2131 field_op = FIELD_OP_MINUS;
2134 field_op = FIELD_OP_PLUS;
2143 static void destroy_hist_field(struct hist_field *hist_field,
2154 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
2155 destroy_hist_field(hist_field->operands[i], level + 1);
2157 kfree(hist_field->var.name);
2158 kfree(hist_field->name);
2159 kfree(hist_field->type);
2164 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
2165 struct ftrace_event_field *field,
2166 unsigned long flags,
2169 struct hist_field *hist_field;
2171 if (field && is_function_field(field))
2174 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2178 hist_field->hist_data = hist_data;
2180 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
2181 goto out; /* caller will populate */
2183 if (flags & HIST_FIELD_FL_VAR_REF) {
2184 hist_field->fn = hist_field_var_ref;
2188 if (flags & HIST_FIELD_FL_HITCOUNT) {
2189 hist_field->fn = hist_field_counter;
2190 hist_field->size = sizeof(u64);
2191 hist_field->type = kstrdup("u64", GFP_KERNEL);
2192 if (!hist_field->type)
2197 if (flags & HIST_FIELD_FL_STACKTRACE) {
2198 hist_field->fn = hist_field_none;
2202 if (flags & HIST_FIELD_FL_LOG2) {
2203 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
2204 hist_field->fn = hist_field_log2;
2205 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
2206 hist_field->size = hist_field->operands[0]->size;
2207 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
2208 if (!hist_field->type)
2213 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2214 hist_field->fn = hist_field_timestamp;
2215 hist_field->size = sizeof(u64);
2216 hist_field->type = kstrdup("u64", GFP_KERNEL);
2217 if (!hist_field->type)
2222 if (flags & HIST_FIELD_FL_CPU) {
2223 hist_field->fn = hist_field_cpu;
2224 hist_field->size = sizeof(int);
2225 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
2226 if (!hist_field->type)
2231 if (WARN_ON_ONCE(!field))
2234 if (is_string_field(field)) {
2235 flags |= HIST_FIELD_FL_STRING;
2237 hist_field->size = MAX_FILTER_STR_VAL;
2238 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2239 if (!hist_field->type)
2242 if (field->filter_type == FILTER_STATIC_STRING)
2243 hist_field->fn = hist_field_string;
2244 else if (field->filter_type == FILTER_DYN_STRING)
2245 hist_field->fn = hist_field_dynstring;
2247 hist_field->fn = hist_field_pstring;
2249 hist_field->size = field->size;
2250 hist_field->is_signed = field->is_signed;
2251 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2252 if (!hist_field->type)
2255 hist_field->fn = select_value_fn(field->size,
2257 if (!hist_field->fn) {
2258 destroy_hist_field(hist_field, 0);
2263 hist_field->field = field;
2264 hist_field->flags = flags;
2267 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2268 if (!hist_field->var.name)
2274 destroy_hist_field(hist_field, 0);
2278 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2282 for (i = 0; i < HIST_FIELDS_MAX; i++) {
2283 if (hist_data->fields[i]) {
2284 destroy_hist_field(hist_data->fields[i], 0);
2285 hist_data->fields[i] = NULL;
2290 static int init_var_ref(struct hist_field *ref_field,
2291 struct hist_field *var_field,
2292 char *system, char *event_name)
2296 ref_field->var.idx = var_field->var.idx;
2297 ref_field->var.hist_data = var_field->hist_data;
2298 ref_field->size = var_field->size;
2299 ref_field->is_signed = var_field->is_signed;
2300 ref_field->flags |= var_field->flags &
2301 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2304 ref_field->system = kstrdup(system, GFP_KERNEL);
2305 if (!ref_field->system)
2310 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2311 if (!ref_field->event_name) {
2317 if (var_field->var.name) {
2318 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2319 if (!ref_field->name) {
2323 } else if (var_field->name) {
2324 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2325 if (!ref_field->name) {
2331 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
2332 if (!ref_field->type) {
2339 kfree(ref_field->system);
2340 kfree(ref_field->event_name);
2341 kfree(ref_field->name);
2346 static struct hist_field *create_var_ref(struct hist_field *var_field,
2347 char *system, char *event_name)
2349 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2350 struct hist_field *ref_field;
2352 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2354 if (init_var_ref(ref_field, var_field, system, event_name)) {
2355 destroy_hist_field(ref_field, 0);
2363 static bool is_var_ref(char *var_name)
2365 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2371 static char *field_name_from_var(struct hist_trigger_data *hist_data,
2377 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2378 name = hist_data->attrs->var_defs.name[i];
2380 if (strcmp(var_name, name) == 0) {
2381 field = hist_data->attrs->var_defs.expr[i];
2382 if (contains_operator(field) || is_var_ref(field))
2391 static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2392 char *system, char *event_name,
2395 struct trace_event_call *call;
2397 if (system && event_name) {
2398 call = hist_data->event_file->event_call;
2400 if (strcmp(system, call->class->system) != 0)
2403 if (strcmp(event_name, trace_event_name(call)) != 0)
2407 if (!!system != !!event_name)
2410 if (!is_var_ref(var_name))
2415 return field_name_from_var(hist_data, var_name);
2418 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2419 char *system, char *event_name,
2422 struct hist_field *var_field = NULL, *ref_field = NULL;
2424 if (!is_var_ref(var_name))
2429 var_field = find_event_var(hist_data, system, event_name, var_name);
2431 ref_field = create_var_ref(var_field, system, event_name);
2434 hist_err_event("Couldn't find variable: $",
2435 system, event_name, var_name);
2440 static struct ftrace_event_field *
2441 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2442 char *field_str, unsigned long *flags)
2444 struct ftrace_event_field *field = NULL;
2445 char *field_name, *modifier, *str;
2447 modifier = str = kstrdup(field_str, GFP_KERNEL);
2449 return ERR_PTR(-ENOMEM);
2451 field_name = strsep(&modifier, ".");
2453 if (strcmp(modifier, "hex") == 0)
2454 *flags |= HIST_FIELD_FL_HEX;
2455 else if (strcmp(modifier, "sym") == 0)
2456 *flags |= HIST_FIELD_FL_SYM;
2457 else if (strcmp(modifier, "sym-offset") == 0)
2458 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2459 else if ((strcmp(modifier, "execname") == 0) &&
2460 (strcmp(field_name, "common_pid") == 0))
2461 *flags |= HIST_FIELD_FL_EXECNAME;
2462 else if (strcmp(modifier, "syscall") == 0)
2463 *flags |= HIST_FIELD_FL_SYSCALL;
2464 else if (strcmp(modifier, "log2") == 0)
2465 *flags |= HIST_FIELD_FL_LOG2;
2466 else if (strcmp(modifier, "usecs") == 0)
2467 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2469 hist_err("Invalid field modifier: ", modifier);
2470 field = ERR_PTR(-EINVAL);
2475 if (strcmp(field_name, "common_timestamp") == 0) {
2476 *flags |= HIST_FIELD_FL_TIMESTAMP;
2477 hist_data->enable_timestamps = true;
2478 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2479 hist_data->attrs->ts_in_usecs = true;
2480 } else if (strcmp(field_name, "cpu") == 0)
2481 *flags |= HIST_FIELD_FL_CPU;
2483 field = trace_find_event_field(file->event_call, field_name);
2484 if (!field || !field->size) {
2485 hist_err("Couldn't find field: ", field_name);
2486 field = ERR_PTR(-EINVAL);
2496 static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2497 struct hist_field *var_ref,
2500 struct hist_field *alias = NULL;
2501 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2503 alias = create_hist_field(hist_data, NULL, flags, var_name);
2507 alias->fn = var_ref->fn;
2508 alias->operands[0] = var_ref;
2510 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2511 destroy_hist_field(alias, 0);
2518 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2519 struct trace_event_file *file, char *str,
2520 unsigned long *flags, char *var_name)
2522 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
2523 struct ftrace_event_field *field = NULL;
2524 struct hist_field *hist_field = NULL;
2527 s = strchr(str, '.');
2529 s = strchr(++s, '.');
2531 ref_system = strsep(&str, ".");
2536 ref_event = strsep(&str, ".");
2545 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2547 hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var);
2549 hist_data->var_refs[hist_data->n_var_refs] = hist_field;
2550 hist_field->var_ref_idx = hist_data->n_var_refs++;
2552 hist_field = create_alias(hist_data, hist_field, var_name);
2563 field = parse_field(hist_data, file, str, flags);
2564 if (IS_ERR(field)) {
2565 ret = PTR_ERR(field);
2569 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2577 return ERR_PTR(ret);
2580 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2581 struct trace_event_file *file,
2582 char *str, unsigned long flags,
2583 char *var_name, unsigned int level);
2585 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2586 struct trace_event_file *file,
2587 char *str, unsigned long flags,
2588 char *var_name, unsigned int level)
2590 struct hist_field *operand1, *expr = NULL;
2591 unsigned long operand_flags;
2595 /* we support only -(xxx) i.e. explicit parens required */
2598 hist_err("Too many subexpressions (3 max): ", str);
2603 str++; /* skip leading '-' */
2605 s = strchr(str, '(');
2613 s = strrchr(str, ')');
2617 ret = -EINVAL; /* no closing ')' */
2621 flags |= HIST_FIELD_FL_EXPR;
2622 expr = create_hist_field(hist_data, NULL, flags, var_name);
2629 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2630 if (IS_ERR(operand1)) {
2631 ret = PTR_ERR(operand1);
2635 expr->flags |= operand1->flags &
2636 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2637 expr->fn = hist_field_unary_minus;
2638 expr->operands[0] = operand1;
2639 expr->operator = FIELD_OP_UNARY_MINUS;
2640 expr->name = expr_str(expr, 0);
2641 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2649 destroy_hist_field(expr, 0);
2650 return ERR_PTR(ret);
2653 static int check_expr_operands(struct hist_field *operand1,
2654 struct hist_field *operand2)
2656 unsigned long operand1_flags = operand1->flags;
2657 unsigned long operand2_flags = operand2->flags;
2659 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2660 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2661 struct hist_field *var;
2663 var = find_var_field(operand1->var.hist_data, operand1->name);
2666 operand1_flags = var->flags;
2669 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2670 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2671 struct hist_field *var;
2673 var = find_var_field(operand2->var.hist_data, operand2->name);
2676 operand2_flags = var->flags;
2679 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
2680 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
2681 hist_err("Timestamp units in expression don't match", NULL);
2688 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2689 struct trace_event_file *file,
2690 char *str, unsigned long flags,
2691 char *var_name, unsigned int level)
2693 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
2694 unsigned long operand_flags;
2695 int field_op, ret = -EINVAL;
2696 char *sep, *operand1_str;
2699 hist_err("Too many subexpressions (3 max): ", str);
2700 return ERR_PTR(-EINVAL);
2703 field_op = contains_operator(str);
2705 if (field_op == FIELD_OP_NONE)
2706 return parse_atom(hist_data, file, str, &flags, var_name);
2708 if (field_op == FIELD_OP_UNARY_MINUS)
2709 return parse_unary(hist_data, file, str, flags, var_name, ++level);
2712 case FIELD_OP_MINUS:
2722 operand1_str = strsep(&str, sep);
2723 if (!operand1_str || !str)
2727 operand1 = parse_atom(hist_data, file, operand1_str,
2728 &operand_flags, NULL);
2729 if (IS_ERR(operand1)) {
2730 ret = PTR_ERR(operand1);
2735 /* rest of string could be another expression e.g. b+c in a+b+c */
2737 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2738 if (IS_ERR(operand2)) {
2739 ret = PTR_ERR(operand2);
2744 ret = check_expr_operands(operand1, operand2);
2748 flags |= HIST_FIELD_FL_EXPR;
2750 flags |= operand1->flags &
2751 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2753 expr = create_hist_field(hist_data, NULL, flags, var_name);
2759 operand1->read_once = true;
2760 operand2->read_once = true;
2762 expr->operands[0] = operand1;
2763 expr->operands[1] = operand2;
2764 expr->operator = field_op;
2765 expr->name = expr_str(expr, 0);
2766 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2773 case FIELD_OP_MINUS:
2774 expr->fn = hist_field_minus;
2777 expr->fn = hist_field_plus;
2786 destroy_hist_field(operand1, 0);
2787 destroy_hist_field(operand2, 0);
2788 destroy_hist_field(expr, 0);
2790 return ERR_PTR(ret);
2793 static char *find_trigger_filter(struct hist_trigger_data *hist_data,
2794 struct trace_event_file *file)
2796 struct event_trigger_data *test;
2798 list_for_each_entry_rcu(test, &file->triggers, list) {
2799 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2800 if (test->private_data == hist_data)
2801 return test->filter_str;
2808 static struct event_command trigger_hist_cmd;
2809 static int event_hist_trigger_func(struct event_command *cmd_ops,
2810 struct trace_event_file *file,
2811 char *glob, char *cmd, char *param);
2813 static bool compatible_keys(struct hist_trigger_data *target_hist_data,
2814 struct hist_trigger_data *hist_data,
2815 unsigned int n_keys)
2817 struct hist_field *target_hist_field, *hist_field;
2818 unsigned int n, i, j;
2820 if (hist_data->n_fields - hist_data->n_vals != n_keys)
2823 i = hist_data->n_vals;
2824 j = target_hist_data->n_vals;
2826 for (n = 0; n < n_keys; n++) {
2827 hist_field = hist_data->fields[i + n];
2828 target_hist_field = target_hist_data->fields[j + n];
2830 if (strcmp(hist_field->type, target_hist_field->type) != 0)
2832 if (hist_field->size != target_hist_field->size)
2834 if (hist_field->is_signed != target_hist_field->is_signed)
2841 static struct hist_trigger_data *
2842 find_compatible_hist(struct hist_trigger_data *target_hist_data,
2843 struct trace_event_file *file)
2845 struct hist_trigger_data *hist_data;
2846 struct event_trigger_data *test;
2847 unsigned int n_keys;
2849 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
2851 list_for_each_entry_rcu(test, &file->triggers, list) {
2852 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
2853 hist_data = test->private_data;
2855 if (compatible_keys(target_hist_data, hist_data, n_keys))
2863 static struct trace_event_file *event_file(struct trace_array *tr,
2864 char *system, char *event_name)
2866 struct trace_event_file *file;
2868 file = __find_event_file(tr, system, event_name);
2870 return ERR_PTR(-EINVAL);
2875 static struct hist_field *
2876 find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
2877 char *system, char *event_name, char *field_name)
2879 struct hist_field *event_var;
2880 char *synthetic_name;
2882 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2883 if (!synthetic_name)
2884 return ERR_PTR(-ENOMEM);
2886 strcpy(synthetic_name, "synthetic_");
2887 strcat(synthetic_name, field_name);
2889 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
2891 kfree(synthetic_name);
2897 * create_field_var_hist - Automatically create a histogram and var for a field
2898 * @target_hist_data: The target hist trigger
2899 * @subsys_name: Optional subsystem name
2900 * @event_name: Optional event name
2901 * @field_name: The name of the field (and the resulting variable)
2903 * Hist trigger actions fetch data from variables, not directly from
2904 * events. However, for convenience, users are allowed to directly
2905 * specify an event field in an action, which will be automatically
2906 * converted into a variable on their behalf.
2908 * If a user specifies a field on an event that isn't the event the
2909 * histogram currently being defined (the target event histogram), the
2910 * only way that can be accomplished is if a new hist trigger is
2911 * created and the field variable defined on that.
2913 * This function creates a new histogram compatible with the target
2914 * event (meaning a histogram with the same key as the target
2915 * histogram), and creates a variable for the specified field, but
2916 * with 'synthetic_' prepended to the variable name in order to avoid
2917 * collision with normal field variables.
2919 * Return: The variable created for the field.
2921 static struct hist_field *
2922 create_field_var_hist(struct hist_trigger_data *target_hist_data,
2923 char *subsys_name, char *event_name, char *field_name)
2925 struct trace_array *tr = target_hist_data->event_file->tr;
2926 struct hist_field *event_var = ERR_PTR(-EINVAL);
2927 struct hist_trigger_data *hist_data;
2928 unsigned int i, n, first = true;
2929 struct field_var_hist *var_hist;
2930 struct trace_event_file *file;
2931 struct hist_field *key_field;
2936 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
2937 hist_err_event("onmatch: Too many field variables defined: ",
2938 subsys_name, event_name, field_name);
2939 return ERR_PTR(-EINVAL);
2942 file = event_file(tr, subsys_name, event_name);
2945 hist_err_event("onmatch: Event file not found: ",
2946 subsys_name, event_name, field_name);
2947 ret = PTR_ERR(file);
2948 return ERR_PTR(ret);
2952 * Look for a histogram compatible with target. We'll use the
2953 * found histogram specification to create a new matching
2954 * histogram with our variable on it. target_hist_data is not
2955 * yet a registered histogram so we can't use that.
2957 hist_data = find_compatible_hist(target_hist_data, file);
2959 hist_err_event("onmatch: Matching event histogram not found: ",
2960 subsys_name, event_name, field_name);
2961 return ERR_PTR(-EINVAL);
2964 /* See if a synthetic field variable has already been created */
2965 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
2966 event_name, field_name);
2967 if (!IS_ERR_OR_NULL(event_var))
2970 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
2972 return ERR_PTR(-ENOMEM);
2974 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2977 return ERR_PTR(-ENOMEM);
2980 /* Use the same keys as the compatible histogram */
2981 strcat(cmd, "keys=");
2983 for_each_hist_key_field(i, hist_data) {
2984 key_field = hist_data->fields[i];
2987 strcat(cmd, key_field->field->name);
2991 /* Create the synthetic field variable specification */
2992 strcat(cmd, ":synthetic_");
2993 strcat(cmd, field_name);
2995 strcat(cmd, field_name);
2997 /* Use the same filter as the compatible histogram */
2998 saved_filter = find_trigger_filter(hist_data, file);
3000 strcat(cmd, " if ");
3001 strcat(cmd, saved_filter);
3004 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3005 if (!var_hist->cmd) {
3008 return ERR_PTR(-ENOMEM);
3011 /* Save the compatible histogram information */
3012 var_hist->hist_data = hist_data;
3014 /* Create the new histogram with our variable */
3015 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
3019 kfree(var_hist->cmd);
3021 hist_err_event("onmatch: Couldn't create histogram for field: ",
3022 subsys_name, event_name, field_name);
3023 return ERR_PTR(ret);
3028 /* If we can't find the variable, something went wrong */
3029 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3030 event_name, field_name);
3031 if (IS_ERR_OR_NULL(event_var)) {
3032 kfree(var_hist->cmd);
3034 hist_err_event("onmatch: Couldn't find synthetic variable: ",
3035 subsys_name, event_name, field_name);
3036 return ERR_PTR(-EINVAL);
3039 n = target_hist_data->n_field_var_hists;
3040 target_hist_data->field_var_hists[n] = var_hist;
3041 target_hist_data->n_field_var_hists++;
3046 static struct hist_field *
3047 find_target_event_var(struct hist_trigger_data *hist_data,
3048 char *subsys_name, char *event_name, char *var_name)
3050 struct trace_event_file *file = hist_data->event_file;
3051 struct hist_field *hist_field = NULL;
3054 struct trace_event_call *call;
3059 call = file->event_call;
3061 if (strcmp(subsys_name, call->class->system) != 0)
3064 if (strcmp(event_name, trace_event_name(call)) != 0)
3068 hist_field = find_var_field(hist_data, var_name);
3073 static inline void __update_field_vars(struct tracing_map_elt *elt,
3074 struct ring_buffer_event *rbe,
3076 struct field_var **field_vars,
3077 unsigned int n_field_vars,
3078 unsigned int field_var_str_start)
3080 struct hist_elt_data *elt_data = elt->private_data;
3081 unsigned int i, j, var_idx;
3084 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3085 struct field_var *field_var = field_vars[i];
3086 struct hist_field *var = field_var->var;
3087 struct hist_field *val = field_var->val;
3089 var_val = val->fn(val, elt, rbe, rec);
3090 var_idx = var->var.idx;
3092 if (val->flags & HIST_FIELD_FL_STRING) {
3093 char *str = elt_data->field_var_str[j++];
3094 char *val_str = (char *)(uintptr_t)var_val;
3096 strscpy(str, val_str, STR_VAR_LEN_MAX);
3097 var_val = (u64)(uintptr_t)str;
3099 tracing_map_set_var(elt, var_idx, var_val);
3103 static void update_field_vars(struct hist_trigger_data *hist_data,
3104 struct tracing_map_elt *elt,
3105 struct ring_buffer_event *rbe,
3108 __update_field_vars(elt, rbe, rec, hist_data->field_vars,
3109 hist_data->n_field_vars, 0);
3112 static void update_max_vars(struct hist_trigger_data *hist_data,
3113 struct tracing_map_elt *elt,
3114 struct ring_buffer_event *rbe,
3117 __update_field_vars(elt, rbe, rec, hist_data->max_vars,
3118 hist_data->n_max_vars, hist_data->n_field_var_str);
3121 static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3122 struct trace_event_file *file,
3123 char *name, int size, const char *type)
3125 struct hist_field *var;
3128 if (find_var(hist_data, file, name) && !hist_data->remove) {
3129 var = ERR_PTR(-EINVAL);
3133 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3135 var = ERR_PTR(-ENOMEM);
3139 idx = tracing_map_add_var(hist_data->map);
3142 var = ERR_PTR(-EINVAL);
3146 var->flags = HIST_FIELD_FL_VAR;
3148 var->var.hist_data = var->hist_data = hist_data;
3150 var->var.name = kstrdup(name, GFP_KERNEL);
3151 var->type = kstrdup(type, GFP_KERNEL);
3152 if (!var->var.name || !var->type) {
3153 kfree(var->var.name);
3156 var = ERR_PTR(-ENOMEM);
3162 static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3163 struct trace_event_file *file,
3166 struct hist_field *val = NULL, *var = NULL;
3167 unsigned long flags = HIST_FIELD_FL_VAR;
3168 struct field_var *field_var;
3171 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
3172 hist_err("Too many field variables defined: ", field_name);
3177 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3179 hist_err("Couldn't parse field variable: ", field_name);
3184 var = create_var(hist_data, file, field_name, val->size, val->type);
3186 hist_err("Couldn't create or find variable: ", field_name);
3192 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3200 field_var->var = var;
3201 field_var->val = val;
3205 field_var = ERR_PTR(ret);
3210 * create_target_field_var - Automatically create a variable for a field
3211 * @target_hist_data: The target hist trigger
3212 * @subsys_name: Optional subsystem name
3213 * @event_name: Optional event name
3214 * @var_name: The name of the field (and the resulting variable)
3216 * Hist trigger actions fetch data from variables, not directly from
3217 * events. However, for convenience, users are allowed to directly
3218 * specify an event field in an action, which will be automatically
3219 * converted into a variable on their behalf.
3221 * This function creates a field variable with the name var_name on
3222 * the hist trigger currently being defined on the target event. If
3223 * subsys_name and event_name are specified, this function simply
3224 * verifies that they do in fact match the target event subsystem and
3227 * Return: The variable created for the field.
3229 static struct field_var *
3230 create_target_field_var(struct hist_trigger_data *target_hist_data,
3231 char *subsys_name, char *event_name, char *var_name)
3233 struct trace_event_file *file = target_hist_data->event_file;
3236 struct trace_event_call *call;
3241 call = file->event_call;
3243 if (strcmp(subsys_name, call->class->system) != 0)
3246 if (strcmp(event_name, trace_event_name(call)) != 0)
3250 return create_field_var(target_hist_data, file, var_name);
3253 static void onmax_print(struct seq_file *m,
3254 struct hist_trigger_data *hist_data,
3255 struct tracing_map_elt *elt,
3256 struct action_data *data)
3258 unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx;
3260 seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx));
3262 for (i = 0; i < hist_data->n_max_vars; i++) {
3263 struct hist_field *save_val = hist_data->max_vars[i]->val;
3264 struct hist_field *save_var = hist_data->max_vars[i]->var;
3267 save_var_idx = save_var->var.idx;
3269 val = tracing_map_read_var(elt, save_var_idx);
3271 if (save_val->flags & HIST_FIELD_FL_STRING) {
3272 seq_printf(m, " %s: %-32s", save_var->var.name,
3273 (char *)(uintptr_t)(val));
3275 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3279 static void onmax_save(struct hist_trigger_data *hist_data,
3280 struct tracing_map_elt *elt, void *rec,
3281 struct ring_buffer_event *rbe,
3282 struct action_data *data, u64 *var_ref_vals)
3284 unsigned int max_idx = data->onmax.max_var->var.idx;
3285 unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx;
3287 u64 var_val, max_val;
3289 var_val = var_ref_vals[max_var_ref_idx];
3290 max_val = tracing_map_read_var(elt, max_idx);
3292 if (var_val <= max_val)
3295 tracing_map_set_var(elt, max_idx, var_val);
3297 update_max_vars(hist_data, elt, rbe, rec);
3300 static void onmax_destroy(struct action_data *data)
3304 destroy_hist_field(data->onmax.max_var, 0);
3305 destroy_hist_field(data->onmax.var, 0);
3307 kfree(data->onmax.var_str);
3308 kfree(data->onmax.fn_name);
3310 for (i = 0; i < data->n_params; i++)
3311 kfree(data->params[i]);
3316 static int onmax_create(struct hist_trigger_data *hist_data,
3317 struct action_data *data)
3319 struct trace_event_file *file = hist_data->event_file;
3320 struct hist_field *var_field, *ref_field, *max_var;
3321 unsigned int var_ref_idx = hist_data->n_var_refs;
3322 struct field_var *field_var;
3323 char *onmax_var_str, *param;
3324 unsigned long flags;
3328 onmax_var_str = data->onmax.var_str;
3329 if (onmax_var_str[0] != '$') {
3330 hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str);
3335 var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str);
3337 hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str);
3341 flags = HIST_FIELD_FL_VAR_REF;
3342 ref_field = create_hist_field(hist_data, NULL, flags, NULL);
3346 if (init_var_ref(ref_field, var_field, NULL, NULL)) {
3347 destroy_hist_field(ref_field, 0);
3351 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
3352 ref_field->var_ref_idx = hist_data->n_var_refs++;
3353 data->onmax.var = ref_field;
3355 data->fn = onmax_save;
3356 data->onmax.max_var_ref_idx = var_ref_idx;
3357 max_var = create_var(hist_data, file, "max", sizeof(u64), "u64");
3358 if (IS_ERR(max_var)) {
3359 hist_err("onmax: Couldn't create onmax variable: ", "max");
3360 ret = PTR_ERR(max_var);
3363 data->onmax.max_var = max_var;
3365 for (i = 0; i < data->n_params; i++) {
3366 param = kstrdup(data->params[i], GFP_KERNEL);
3372 field_var = create_target_field_var(hist_data, NULL, NULL, param);
3373 if (IS_ERR(field_var)) {
3374 hist_err("onmax: Couldn't create field variable: ", param);
3375 ret = PTR_ERR(field_var);
3380 hist_data->max_vars[hist_data->n_max_vars++] = field_var;
3381 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3382 hist_data->n_max_var_str++;
3390 static int parse_action_params(char *params, struct action_data *data)
3392 char *param, *saved_param;
3396 if (data->n_params >= SYNTH_FIELDS_MAX)
3399 param = strsep(¶ms, ",");
3405 param = strstrip(param);
3406 if (strlen(param) < 2) {
3407 hist_err("Invalid action param: ", param);
3412 saved_param = kstrdup(param, GFP_KERNEL);
3418 data->params[data->n_params++] = saved_param;
3424 static struct action_data *onmax_parse(char *str)
3426 char *onmax_fn_name, *onmax_var_str;
3427 struct action_data *data;
3430 data = kzalloc(sizeof(*data), GFP_KERNEL);
3432 return ERR_PTR(-ENOMEM);
3434 onmax_var_str = strsep(&str, ")");
3435 if (!onmax_var_str || !str) {
3440 data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL);
3441 if (!data->onmax.var_str) {
3450 onmax_fn_name = strsep(&str, "(");
3451 if (!onmax_fn_name || !str)
3454 if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) {
3455 char *params = strsep(&str, ")");
3462 ret = parse_action_params(params, data);
3468 data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL);
3469 if (!data->onmax.fn_name) {
3476 onmax_destroy(data);
3477 data = ERR_PTR(ret);
3481 static void onmatch_destroy(struct action_data *data)
3485 mutex_lock(&synth_event_mutex);
3487 kfree(data->onmatch.match_event);
3488 kfree(data->onmatch.match_event_system);
3489 kfree(data->onmatch.synth_event_name);
3491 for (i = 0; i < data->n_params; i++)
3492 kfree(data->params[i]);
3494 if (data->onmatch.synth_event)
3495 data->onmatch.synth_event->ref--;
3499 mutex_unlock(&synth_event_mutex);
3502 static void destroy_field_var(struct field_var *field_var)
3507 destroy_hist_field(field_var->var, 0);
3508 destroy_hist_field(field_var->val, 0);
3513 static void destroy_field_vars(struct hist_trigger_data *hist_data)
3517 for (i = 0; i < hist_data->n_field_vars; i++)
3518 destroy_field_var(hist_data->field_vars[i]);
3521 static void save_field_var(struct hist_trigger_data *hist_data,
3522 struct field_var *field_var)
3524 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
3526 if (field_var->val->flags & HIST_FIELD_FL_STRING)
3527 hist_data->n_field_var_str++;
3531 static void destroy_synth_var_refs(struct hist_trigger_data *hist_data)
3535 for (i = 0; i < hist_data->n_synth_var_refs; i++)
3536 destroy_hist_field(hist_data->synth_var_refs[i], 0);
3539 static void save_synth_var_ref(struct hist_trigger_data *hist_data,
3540 struct hist_field *var_ref)
3542 hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref;
3544 hist_data->var_refs[hist_data->n_var_refs] = var_ref;
3545 var_ref->var_ref_idx = hist_data->n_var_refs++;
3548 static int check_synth_field(struct synth_event *event,
3549 struct hist_field *hist_field,
3550 unsigned int field_pos)
3552 struct synth_field *field;
3554 if (field_pos >= event->n_fields)
3557 field = event->fields[field_pos];
3559 if (strcmp(field->type, hist_field->type) != 0)
3565 static struct hist_field *
3566 onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
3567 char *system, char *event, char *var)
3569 struct hist_field *hist_field;
3571 var++; /* skip '$' */
3573 hist_field = find_target_event_var(hist_data, system, event, var);
3576 system = data->onmatch.match_event_system;
3577 event = data->onmatch.match_event;
3580 hist_field = find_event_var(hist_data, system, event, var);
3584 hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var);
3589 static struct hist_field *
3590 onmatch_create_field_var(struct hist_trigger_data *hist_data,
3591 struct action_data *data, char *system,
3592 char *event, char *var)
3594 struct hist_field *hist_field = NULL;
3595 struct field_var *field_var;
3598 * First try to create a field var on the target event (the
3599 * currently being defined). This will create a variable for
3600 * unqualified fields on the target event, or if qualified,
3601 * target fields that have qualified names matching the target.
3603 field_var = create_target_field_var(hist_data, system, event, var);
3605 if (field_var && !IS_ERR(field_var)) {
3606 save_field_var(hist_data, field_var);
3607 hist_field = field_var->var;
3611 * If no explicit system.event is specfied, default to
3612 * looking for fields on the onmatch(system.event.xxx)
3616 system = data->onmatch.match_event_system;
3617 event = data->onmatch.match_event;
3621 * At this point, we're looking at a field on another
3622 * event. Because we can't modify a hist trigger on
3623 * another event to add a variable for a field, we need
3624 * to create a new trigger on that event and create the
3625 * variable at the same time.
3627 hist_field = create_field_var_hist(hist_data, system, event, var);
3628 if (IS_ERR(hist_field))
3634 destroy_field_var(field_var);
3639 static int onmatch_create(struct hist_trigger_data *hist_data,
3640 struct trace_event_file *file,
3641 struct action_data *data)
3643 char *event_name, *param, *system = NULL;
3644 struct hist_field *hist_field, *var_ref;
3645 unsigned int i, var_ref_idx;
3646 unsigned int field_pos = 0;
3647 struct synth_event *event;
3650 mutex_lock(&synth_event_mutex);
3651 event = find_synth_event(data->onmatch.synth_event_name);
3653 hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name);
3654 mutex_unlock(&synth_event_mutex);
3658 mutex_unlock(&synth_event_mutex);
3660 var_ref_idx = hist_data->n_var_refs;
3662 for (i = 0; i < data->n_params; i++) {
3665 p = param = kstrdup(data->params[i], GFP_KERNEL);
3671 system = strsep(¶m, ".");
3673 param = (char *)system;
3674 system = event_name = NULL;
3676 event_name = strsep(¶m, ".");
3684 if (param[0] == '$')
3685 hist_field = onmatch_find_var(hist_data, data, system,
3688 hist_field = onmatch_create_field_var(hist_data, data,
3699 if (check_synth_field(event, hist_field, field_pos) == 0) {
3700 var_ref = create_var_ref(hist_field, system, event_name);
3707 save_synth_var_ref(hist_data, var_ref);
3713 hist_err_event("onmatch: Param type doesn't match synthetic event field type: ",
3714 system, event_name, param);
3720 if (field_pos != event->n_fields) {
3721 hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name);
3726 data->fn = action_trace;
3727 data->onmatch.synth_event = event;
3728 data->onmatch.var_ref_idx = var_ref_idx;
3732 mutex_lock(&synth_event_mutex);
3734 mutex_unlock(&synth_event_mutex);
3739 static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
3741 char *match_event, *match_event_system;
3742 char *synth_event_name, *params;
3743 struct action_data *data;
3746 data = kzalloc(sizeof(*data), GFP_KERNEL);
3748 return ERR_PTR(-ENOMEM);
3750 match_event = strsep(&str, ")");
3751 if (!match_event || !str) {
3752 hist_err("onmatch: Missing closing paren: ", match_event);
3756 match_event_system = strsep(&match_event, ".");
3758 hist_err("onmatch: Missing subsystem for match event: ", match_event_system);
3762 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
3763 hist_err_event("onmatch: Invalid subsystem or event name: ",
3764 match_event_system, match_event, NULL);
3768 data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL);
3769 if (!data->onmatch.match_event) {
3774 data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL);
3775 if (!data->onmatch.match_event_system) {
3782 hist_err("onmatch: Missing . after onmatch(): ", str);
3786 synth_event_name = strsep(&str, "(");
3787 if (!synth_event_name || !str) {
3788 hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name);
3792 data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL);
3793 if (!data->onmatch.synth_event_name) {
3798 params = strsep(&str, ")");
3799 if (!params || !str || (str && strlen(str))) {
3800 hist_err("onmatch: Missing closing paramlist paren: ", params);
3804 ret = parse_action_params(params, data);
3810 onmatch_destroy(data);
3811 data = ERR_PTR(ret);
3815 static int create_hitcount_val(struct hist_trigger_data *hist_data)
3817 hist_data->fields[HITCOUNT_IDX] =
3818 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
3819 if (!hist_data->fields[HITCOUNT_IDX])
3822 hist_data->n_vals++;
3823 hist_data->n_fields++;
3825 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
3831 static int __create_val_field(struct hist_trigger_data *hist_data,
3832 unsigned int val_idx,
3833 struct trace_event_file *file,
3834 char *var_name, char *field_str,
3835 unsigned long flags)
3837 struct hist_field *hist_field;
3840 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
3841 if (IS_ERR(hist_field)) {
3842 ret = PTR_ERR(hist_field);
3846 hist_data->fields[val_idx] = hist_field;
3848 ++hist_data->n_vals;
3849 ++hist_data->n_fields;
3851 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3857 static int create_val_field(struct hist_trigger_data *hist_data,
3858 unsigned int val_idx,
3859 struct trace_event_file *file,
3862 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
3865 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
3868 static int create_var_field(struct hist_trigger_data *hist_data,
3869 unsigned int val_idx,
3870 struct trace_event_file *file,
3871 char *var_name, char *expr_str)
3873 unsigned long flags = 0;
3875 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
3878 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
3879 hist_err("Variable already defined: ", var_name);
3883 flags |= HIST_FIELD_FL_VAR;
3884 hist_data->n_vars++;
3885 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
3888 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
3891 static int create_val_fields(struct hist_trigger_data *hist_data,
3892 struct trace_event_file *file)
3894 char *fields_str, *field_str;
3895 unsigned int i, j = 1;
3898 ret = create_hitcount_val(hist_data);
3902 fields_str = hist_data->attrs->vals_str;
3906 strsep(&fields_str, "=");
3910 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
3911 j < TRACING_MAP_VALS_MAX; i++) {
3912 field_str = strsep(&fields_str, ",");
3916 if (strcmp(field_str, "hitcount") == 0)
3919 ret = create_val_field(hist_data, j++, file, field_str);
3924 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
3930 static int create_key_field(struct hist_trigger_data *hist_data,
3931 unsigned int key_idx,
3932 unsigned int key_offset,
3933 struct trace_event_file *file,
3936 struct hist_field *hist_field = NULL;
3938 unsigned long flags = 0;
3939 unsigned int key_size;
3942 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
3945 flags |= HIST_FIELD_FL_KEY;
3947 if (strcmp(field_str, "stacktrace") == 0) {
3948 flags |= HIST_FIELD_FL_STACKTRACE;
3949 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
3950 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
3952 hist_field = parse_expr(hist_data, file, field_str, flags,
3954 if (IS_ERR(hist_field)) {
3955 ret = PTR_ERR(hist_field);
3959 if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
3960 hist_err("Using variable references as keys not supported: ", field_str);
3961 destroy_hist_field(hist_field, 0);
3966 key_size = hist_field->size;
3969 hist_data->fields[key_idx] = hist_field;
3971 key_size = ALIGN(key_size, sizeof(u64));
3972 hist_data->fields[key_idx]->size = key_size;
3973 hist_data->fields[key_idx]->offset = key_offset;
3975 hist_data->key_size += key_size;
3977 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
3982 hist_data->n_keys++;
3983 hist_data->n_fields++;
3985 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
3993 static int create_key_fields(struct hist_trigger_data *hist_data,
3994 struct trace_event_file *file)
3996 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
3997 char *fields_str, *field_str;
4000 fields_str = hist_data->attrs->keys_str;
4004 strsep(&fields_str, "=");
4008 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
4009 field_str = strsep(&fields_str, ",");
4012 ret = create_key_field(hist_data, i, key_offset,
4027 static int create_var_fields(struct hist_trigger_data *hist_data,
4028 struct trace_event_file *file)
4030 unsigned int i, j = hist_data->n_vals;
4033 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4035 for (i = 0; i < n_vars; i++) {
4036 char *var_name = hist_data->attrs->var_defs.name[i];
4037 char *expr = hist_data->attrs->var_defs.expr[i];
4039 ret = create_var_field(hist_data, j++, file, var_name, expr);
4047 static void free_var_defs(struct hist_trigger_data *hist_data)
4051 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4052 kfree(hist_data->attrs->var_defs.name[i]);
4053 kfree(hist_data->attrs->var_defs.expr[i]);
4056 hist_data->attrs->var_defs.n_vars = 0;
4059 static int parse_var_defs(struct hist_trigger_data *hist_data)
4061 char *s, *str, *var_name, *field_str;
4062 unsigned int i, j, n_vars = 0;
4065 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4066 str = hist_data->attrs->assignment_str[i];
4067 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4068 field_str = strsep(&str, ",");
4072 var_name = strsep(&field_str, "=");
4073 if (!var_name || !field_str) {
4074 hist_err("Malformed assignment: ", var_name);
4079 if (n_vars == TRACING_MAP_VARS_MAX) {
4080 hist_err("Too many variables defined: ", var_name);
4085 s = kstrdup(var_name, GFP_KERNEL);
4090 hist_data->attrs->var_defs.name[n_vars] = s;
4092 s = kstrdup(field_str, GFP_KERNEL);
4094 kfree(hist_data->attrs->var_defs.name[n_vars]);
4098 hist_data->attrs->var_defs.expr[n_vars++] = s;
4100 hist_data->attrs->var_defs.n_vars = n_vars;
4106 free_var_defs(hist_data);
4111 static int create_hist_fields(struct hist_trigger_data *hist_data,
4112 struct trace_event_file *file)
4116 ret = parse_var_defs(hist_data);
4120 ret = create_val_fields(hist_data, file);
4124 ret = create_var_fields(hist_data, file);
4128 ret = create_key_fields(hist_data, file);
4132 free_var_defs(hist_data);
4137 static int is_descending(const char *str)
4142 if (strcmp(str, "descending") == 0)
4145 if (strcmp(str, "ascending") == 0)
4151 static int create_sort_keys(struct hist_trigger_data *hist_data)
4153 char *fields_str = hist_data->attrs->sort_key_str;
4154 struct tracing_map_sort_key *sort_key;
4155 int descending, ret = 0;
4156 unsigned int i, j, k;
4158 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4163 strsep(&fields_str, "=");
4169 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
4170 struct hist_field *hist_field;
4171 char *field_str, *field_name;
4172 const char *test_name;
4174 sort_key = &hist_data->sort_keys[i];
4176 field_str = strsep(&fields_str, ",");
4183 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4188 field_name = strsep(&field_str, ".");
4194 if (strcmp(field_name, "hitcount") == 0) {
4195 descending = is_descending(field_str);
4196 if (descending < 0) {
4200 sort_key->descending = descending;
4204 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4207 hist_field = hist_data->fields[j];
4208 if (hist_field->flags & HIST_FIELD_FL_VAR)
4213 test_name = hist_field_name(hist_field, 0);
4215 if (strcmp(field_name, test_name) == 0) {
4216 sort_key->field_idx = idx;
4217 descending = is_descending(field_str);
4218 if (descending < 0) {
4222 sort_key->descending = descending;
4226 if (j == hist_data->n_fields) {
4232 hist_data->n_sort_keys = i;
4237 static void destroy_actions(struct hist_trigger_data *hist_data)
4241 for (i = 0; i < hist_data->n_actions; i++) {
4242 struct action_data *data = hist_data->actions[i];
4244 if (data->fn == action_trace)
4245 onmatch_destroy(data);
4246 else if (data->fn == onmax_save)
4247 onmax_destroy(data);
4253 static int parse_actions(struct hist_trigger_data *hist_data)
4255 struct trace_array *tr = hist_data->event_file->tr;
4256 struct action_data *data;
4261 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4262 str = hist_data->attrs->action_str[i];
4264 if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) {
4265 char *action_str = str + strlen("onmatch(");
4267 data = onmatch_parse(tr, action_str);
4269 ret = PTR_ERR(data);
4272 data->fn = action_trace;
4273 } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) {
4274 char *action_str = str + strlen("onmax(");
4276 data = onmax_parse(action_str);
4278 ret = PTR_ERR(data);
4281 data->fn = onmax_save;
4287 hist_data->actions[hist_data->n_actions++] = data;
4293 static int create_actions(struct hist_trigger_data *hist_data,
4294 struct trace_event_file *file)
4296 struct action_data *data;
4300 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4301 data = hist_data->actions[i];
4303 if (data->fn == action_trace) {
4304 ret = onmatch_create(hist_data, file, data);
4307 } else if (data->fn == onmax_save) {
4308 ret = onmax_create(hist_data, data);
4317 static void print_actions(struct seq_file *m,
4318 struct hist_trigger_data *hist_data,
4319 struct tracing_map_elt *elt)
4323 for (i = 0; i < hist_data->n_actions; i++) {
4324 struct action_data *data = hist_data->actions[i];
4326 if (data->fn == onmax_save)
4327 onmax_print(m, hist_data, elt, data);
4331 static void print_onmax_spec(struct seq_file *m,
4332 struct hist_trigger_data *hist_data,
4333 struct action_data *data)
4337 seq_puts(m, ":onmax(");
4338 seq_printf(m, "%s", data->onmax.var_str);
4339 seq_printf(m, ").%s(", data->onmax.fn_name);
4341 for (i = 0; i < hist_data->n_max_vars; i++) {
4342 seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name);
4343 if (i < hist_data->n_max_vars - 1)
4349 static void print_onmatch_spec(struct seq_file *m,
4350 struct hist_trigger_data *hist_data,
4351 struct action_data *data)
4355 seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,
4356 data->onmatch.match_event);
4358 seq_printf(m, "%s(", data->onmatch.synth_event->name);
4360 for (i = 0; i < data->n_params; i++) {
4363 seq_printf(m, "%s", data->params[i]);
4369 static bool actions_match(struct hist_trigger_data *hist_data,
4370 struct hist_trigger_data *hist_data_test)
4374 if (hist_data->n_actions != hist_data_test->n_actions)
4377 for (i = 0; i < hist_data->n_actions; i++) {
4378 struct action_data *data = hist_data->actions[i];
4379 struct action_data *data_test = hist_data_test->actions[i];
4381 if (data->fn != data_test->fn)
4384 if (data->n_params != data_test->n_params)
4387 for (j = 0; j < data->n_params; j++) {
4388 if (strcmp(data->params[j], data_test->params[j]) != 0)
4392 if (data->fn == action_trace) {
4393 if (strcmp(data->onmatch.synth_event_name,
4394 data_test->onmatch.synth_event_name) != 0)
4396 if (strcmp(data->onmatch.match_event_system,
4397 data_test->onmatch.match_event_system) != 0)
4399 if (strcmp(data->onmatch.match_event,
4400 data_test->onmatch.match_event) != 0)
4402 } else if (data->fn == onmax_save) {
4403 if (strcmp(data->onmax.var_str,
4404 data_test->onmax.var_str) != 0)
4406 if (strcmp(data->onmax.fn_name,
4407 data_test->onmax.fn_name) != 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->fn == action_trace)
4425 print_onmatch_spec(m, hist_data, data);
4426 else if (data->fn == onmax_save)
4427 print_onmax_spec(m, hist_data, data);
4431 static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
4435 for (i = 0; i < hist_data->n_field_var_hists; i++) {
4436 kfree(hist_data->field_var_hists[i]->cmd);
4437 kfree(hist_data->field_var_hists[i]);
4441 static void destroy_hist_data(struct hist_trigger_data *hist_data)
4446 destroy_hist_trigger_attrs(hist_data->attrs);
4447 destroy_hist_fields(hist_data);
4448 tracing_map_destroy(hist_data->map);
4450 destroy_actions(hist_data);
4451 destroy_field_vars(hist_data);
4452 destroy_field_var_hists(hist_data);
4453 destroy_synth_var_refs(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, void *rec,
4560 struct ring_buffer_event *rbe,
4563 struct hist_elt_data *elt_data;
4564 struct hist_field *hist_field;
4565 unsigned int i, var_idx;
4568 elt_data = elt->private_data;
4569 elt_data->var_ref_vals = var_ref_vals;
4571 for_each_hist_val_field(i, hist_data) {
4572 hist_field = hist_data->fields[i];
4573 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
4574 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4575 var_idx = hist_field->var.idx;
4576 tracing_map_set_var(elt, var_idx, hist_val);
4579 tracing_map_update_sum(elt, i, hist_val);
4582 for_each_hist_key_field(i, hist_data) {
4583 hist_field = hist_data->fields[i];
4584 if (hist_field->flags & HIST_FIELD_FL_VAR) {
4585 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
4586 var_idx = hist_field->var.idx;
4587 tracing_map_set_var(elt, var_idx, hist_val);
4591 update_field_vars(hist_data, elt, rbe, rec);
4594 static inline void add_to_key(char *compound_key, void *key,
4595 struct hist_field *key_field, void *rec)
4597 size_t size = key_field->size;
4599 if (key_field->flags & HIST_FIELD_FL_STRING) {
4600 struct ftrace_event_field *field;
4602 field = key_field->field;
4603 if (field->filter_type == FILTER_DYN_STRING)
4604 size = *(u32 *)(rec + field->offset) >> 16;
4605 else if (field->filter_type == FILTER_PTR_STRING)
4607 else if (field->filter_type == FILTER_STATIC_STRING)
4610 /* ensure NULL-termination */
4611 if (size > key_field->size - 1)
4612 size = key_field->size - 1;
4615 memcpy(compound_key + key_field->offset, key, size);
4619 hist_trigger_actions(struct hist_trigger_data *hist_data,
4620 struct tracing_map_elt *elt, void *rec,
4621 struct ring_buffer_event *rbe, u64 *var_ref_vals)
4623 struct action_data *data;
4626 for (i = 0; i < hist_data->n_actions; i++) {
4627 data = hist_data->actions[i];
4628 data->fn(hist_data, elt, rec, rbe, data, var_ref_vals);
4632 static void event_hist_trigger(struct event_trigger_data *data, void *rec,
4633 struct ring_buffer_event *rbe)
4635 struct hist_trigger_data *hist_data = data->private_data;
4636 bool use_compound_key = (hist_data->n_keys > 1);
4637 unsigned long entries[HIST_STACKTRACE_DEPTH];
4638 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
4639 char compound_key[HIST_KEY_SIZE_MAX];
4640 struct tracing_map_elt *elt = NULL;
4641 struct stack_trace stacktrace;
4642 struct hist_field *key_field;
4647 memset(compound_key, 0, hist_data->key_size);
4649 for_each_hist_key_field(i, hist_data) {
4650 key_field = hist_data->fields[i];
4652 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4653 stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
4654 stacktrace.entries = entries;
4655 stacktrace.nr_entries = 0;
4656 stacktrace.skip = HIST_STACKTRACE_SKIP;
4658 memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
4659 save_stack_trace(&stacktrace);
4663 field_contents = key_field->fn(key_field, elt, rbe, rec);
4664 if (key_field->flags & HIST_FIELD_FL_STRING) {
4665 key = (void *)(unsigned long)field_contents;
4666 use_compound_key = true;
4668 key = (void *)&field_contents;
4671 if (use_compound_key)
4672 add_to_key(compound_key, key, key_field, rec);
4675 if (use_compound_key)
4678 if (hist_data->n_var_refs &&
4679 !resolve_var_refs(hist_data, key, var_ref_vals, false))
4682 elt = tracing_map_insert(hist_data->map, key);
4686 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
4688 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
4689 hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals);
4692 static void hist_trigger_stacktrace_print(struct seq_file *m,
4693 unsigned long *stacktrace_entries,
4694 unsigned int max_entries)
4696 char str[KSYM_SYMBOL_LEN];
4697 unsigned int spaces = 8;
4700 for (i = 0; i < max_entries; i++) {
4701 if (stacktrace_entries[i] == ULONG_MAX)
4704 seq_printf(m, "%*c", 1 + spaces, ' ');
4705 sprint_symbol(str, stacktrace_entries[i]);
4706 seq_printf(m, "%s\n", str);
4711 hist_trigger_entry_print(struct seq_file *m,
4712 struct hist_trigger_data *hist_data, void *key,
4713 struct tracing_map_elt *elt)
4715 struct hist_field *key_field;
4716 char str[KSYM_SYMBOL_LEN];
4717 bool multiline = false;
4718 const char *field_name;
4724 for_each_hist_key_field(i, hist_data) {
4725 key_field = hist_data->fields[i];
4727 if (i > hist_data->n_vals)
4730 field_name = hist_field_name(key_field, 0);
4732 if (key_field->flags & HIST_FIELD_FL_HEX) {
4733 uval = *(u64 *)(key + key_field->offset);
4734 seq_printf(m, "%s: %llx", field_name, uval);
4735 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
4736 uval = *(u64 *)(key + key_field->offset);
4737 sprint_symbol_no_offset(str, uval);
4738 seq_printf(m, "%s: [%llx] %-45s", field_name,
4740 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
4741 uval = *(u64 *)(key + key_field->offset);
4742 sprint_symbol(str, uval);
4743 seq_printf(m, "%s: [%llx] %-55s", field_name,
4745 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
4746 struct hist_elt_data *elt_data = elt->private_data;
4749 if (WARN_ON_ONCE(!elt_data))
4752 comm = elt_data->comm;
4754 uval = *(u64 *)(key + key_field->offset);
4755 seq_printf(m, "%s: %-16s[%10llu]", field_name,
4757 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
4758 const char *syscall_name;
4760 uval = *(u64 *)(key + key_field->offset);
4761 syscall_name = get_syscall_name(uval);
4763 syscall_name = "unknown_syscall";
4765 seq_printf(m, "%s: %-30s[%3llu]", field_name,
4766 syscall_name, uval);
4767 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
4768 seq_puts(m, "stacktrace:\n");
4769 hist_trigger_stacktrace_print(m,
4770 key + key_field->offset,
4771 HIST_STACKTRACE_DEPTH);
4773 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
4774 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
4775 *(u64 *)(key + key_field->offset));
4776 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
4777 seq_printf(m, "%s: %-50s", field_name,
4778 (char *)(key + key_field->offset));
4780 uval = *(u64 *)(key + key_field->offset);
4781 seq_printf(m, "%s: %10llu", field_name, uval);
4790 seq_printf(m, " hitcount: %10llu",
4791 tracing_map_read_sum(elt, HITCOUNT_IDX));
4793 for (i = 1; i < hist_data->n_vals; i++) {
4794 field_name = hist_field_name(hist_data->fields[i], 0);
4796 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
4797 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
4800 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
4801 seq_printf(m, " %s: %10llx", field_name,
4802 tracing_map_read_sum(elt, i));
4804 seq_printf(m, " %s: %10llu", field_name,
4805 tracing_map_read_sum(elt, i));
4809 print_actions(m, hist_data, elt);
4814 static int print_entries(struct seq_file *m,
4815 struct hist_trigger_data *hist_data)
4817 struct tracing_map_sort_entry **sort_entries = NULL;
4818 struct tracing_map *map = hist_data->map;
4821 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
4822 hist_data->n_sort_keys,
4827 for (i = 0; i < n_entries; i++)
4828 hist_trigger_entry_print(m, hist_data,
4829 sort_entries[i]->key,
4830 sort_entries[i]->elt);
4832 tracing_map_destroy_sort_entries(sort_entries, n_entries);
4837 static void hist_trigger_show(struct seq_file *m,
4838 struct event_trigger_data *data, int n)
4840 struct hist_trigger_data *hist_data;
4844 seq_puts(m, "\n\n");
4846 seq_puts(m, "# event histogram\n#\n# trigger info: ");
4847 data->ops->print(m, data->ops, data);
4848 seq_puts(m, "#\n\n");
4850 hist_data = data->private_data;
4851 n_entries = print_entries(m, hist_data);
4855 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
4856 (u64)atomic64_read(&hist_data->map->hits),
4857 n_entries, (u64)atomic64_read(&hist_data->map->drops));
4860 static int hist_show(struct seq_file *m, void *v)
4862 struct event_trigger_data *data;
4863 struct trace_event_file *event_file;
4866 mutex_lock(&event_mutex);
4868 event_file = event_file_data(m->private);
4869 if (unlikely(!event_file)) {
4874 list_for_each_entry_rcu(data, &event_file->triggers, list) {
4875 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
4876 hist_trigger_show(m, data, n++);
4879 if (have_hist_err()) {
4880 seq_printf(m, "\nERROR: %s\n", hist_err_str);
4881 seq_printf(m, " Last command: %s\n", last_hist_cmd);
4885 mutex_unlock(&event_mutex);
4890 static int event_hist_open(struct inode *inode, struct file *file)
4892 return single_open(file, hist_show, file);
4895 const struct file_operations event_hist_fops = {
4896 .open = event_hist_open,
4898 .llseek = seq_lseek,
4899 .release = single_release,
4902 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
4904 const char *field_name = hist_field_name(hist_field, 0);
4906 if (hist_field->var.name)
4907 seq_printf(m, "%s=", hist_field->var.name);
4909 if (hist_field->flags & HIST_FIELD_FL_CPU)
4911 else if (field_name) {
4912 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
4913 hist_field->flags & HIST_FIELD_FL_ALIAS)
4915 seq_printf(m, "%s", field_name);
4916 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
4917 seq_puts(m, "common_timestamp");
4919 if (hist_field->flags) {
4920 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
4921 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
4922 const char *flags = get_hist_field_flags(hist_field);
4925 seq_printf(m, ".%s", flags);
4930 static int event_hist_trigger_print(struct seq_file *m,
4931 struct event_trigger_ops *ops,
4932 struct event_trigger_data *data)
4934 struct hist_trigger_data *hist_data = data->private_data;
4935 struct hist_field *field;
4936 bool have_var = false;
4939 seq_puts(m, "hist:");
4942 seq_printf(m, "%s:", data->name);
4944 seq_puts(m, "keys=");
4946 for_each_hist_key_field(i, hist_data) {
4947 field = hist_data->fields[i];
4949 if (i > hist_data->n_vals)
4952 if (field->flags & HIST_FIELD_FL_STACKTRACE)
4953 seq_puts(m, "stacktrace");
4955 hist_field_print(m, field);
4958 seq_puts(m, ":vals=");
4960 for_each_hist_val_field(i, hist_data) {
4961 field = hist_data->fields[i];
4962 if (field->flags & HIST_FIELD_FL_VAR) {
4967 if (i == HITCOUNT_IDX)
4968 seq_puts(m, "hitcount");
4971 hist_field_print(m, field);
4980 for_each_hist_val_field(i, hist_data) {
4981 field = hist_data->fields[i];
4983 if (field->flags & HIST_FIELD_FL_VAR) {
4986 hist_field_print(m, field);
4991 seq_puts(m, ":sort=");
4993 for (i = 0; i < hist_data->n_sort_keys; i++) {
4994 struct tracing_map_sort_key *sort_key;
4995 unsigned int idx, first_key_idx;
4998 first_key_idx = hist_data->n_vals - hist_data->n_vars;
5000 sort_key = &hist_data->sort_keys[i];
5001 idx = sort_key->field_idx;
5003 if (WARN_ON(idx >= HIST_FIELDS_MAX))
5009 if (idx == HITCOUNT_IDX)
5010 seq_puts(m, "hitcount");
5012 if (idx >= first_key_idx)
5013 idx += hist_data->n_vars;
5014 hist_field_print(m, hist_data->fields[idx]);
5017 if (sort_key->descending)
5018 seq_puts(m, ".descending");
5020 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
5021 if (hist_data->enable_timestamps)
5022 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
5024 print_actions_spec(m, hist_data);
5026 if (data->filter_str)
5027 seq_printf(m, " if %s", data->filter_str);
5030 seq_puts(m, " [paused]");
5032 seq_puts(m, " [active]");
5039 static int event_hist_trigger_init(struct event_trigger_ops *ops,
5040 struct event_trigger_data *data)
5042 struct hist_trigger_data *hist_data = data->private_data;
5044 if (!data->ref && hist_data->attrs->name)
5045 save_named_trigger(hist_data->attrs->name, data);
5052 static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5054 struct trace_event_file *file;
5059 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5060 file = hist_data->field_var_hists[i]->hist_data->event_file;
5061 cmd = hist_data->field_var_hists[i]->cmd;
5062 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5063 "!hist", "hist", cmd);
5067 static void event_hist_trigger_free(struct event_trigger_ops *ops,
5068 struct event_trigger_data *data)
5070 struct hist_trigger_data *hist_data = data->private_data;
5072 if (WARN_ON_ONCE(data->ref <= 0))
5078 del_named_trigger(data);
5080 trigger_data_free(data);
5082 remove_hist_vars(hist_data);
5084 unregister_field_var_hists(hist_data);
5086 destroy_hist_data(hist_data);
5090 static struct event_trigger_ops event_hist_trigger_ops = {
5091 .func = event_hist_trigger,
5092 .print = event_hist_trigger_print,
5093 .init = event_hist_trigger_init,
5094 .free = event_hist_trigger_free,
5097 static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5098 struct event_trigger_data *data)
5102 save_named_trigger(data->named_data->name, data);
5104 event_hist_trigger_init(ops, data->named_data);
5109 static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5110 struct event_trigger_data *data)
5112 if (WARN_ON_ONCE(data->ref <= 0))
5115 event_hist_trigger_free(ops, data->named_data);
5119 del_named_trigger(data);
5120 trigger_data_free(data);
5124 static struct event_trigger_ops event_hist_trigger_named_ops = {
5125 .func = event_hist_trigger,
5126 .print = event_hist_trigger_print,
5127 .init = event_hist_trigger_named_init,
5128 .free = event_hist_trigger_named_free,
5131 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5134 return &event_hist_trigger_ops;
5137 static void hist_clear(struct event_trigger_data *data)
5139 struct hist_trigger_data *hist_data = data->private_data;
5142 pause_named_trigger(data);
5144 synchronize_sched();
5146 tracing_map_clear(hist_data->map);
5149 unpause_named_trigger(data);
5152 static bool compatible_field(struct ftrace_event_field *field,
5153 struct ftrace_event_field *test_field)
5155 if (field == test_field)
5157 if (field == NULL || test_field == NULL)
5159 if (strcmp(field->name, test_field->name) != 0)
5161 if (strcmp(field->type, test_field->type) != 0)
5163 if (field->size != test_field->size)
5165 if (field->is_signed != test_field->is_signed)
5171 static bool hist_trigger_match(struct event_trigger_data *data,
5172 struct event_trigger_data *data_test,
5173 struct event_trigger_data *named_data,
5176 struct tracing_map_sort_key *sort_key, *sort_key_test;
5177 struct hist_trigger_data *hist_data, *hist_data_test;
5178 struct hist_field *key_field, *key_field_test;
5181 if (named_data && (named_data != data_test) &&
5182 (named_data != data_test->named_data))
5185 if (!named_data && is_named_trigger(data_test))
5188 hist_data = data->private_data;
5189 hist_data_test = data_test->private_data;
5191 if (hist_data->n_vals != hist_data_test->n_vals ||
5192 hist_data->n_fields != hist_data_test->n_fields ||
5193 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5196 if (!ignore_filter) {
5197 if ((data->filter_str && !data_test->filter_str) ||
5198 (!data->filter_str && data_test->filter_str))
5202 for_each_hist_field(i, hist_data) {
5203 key_field = hist_data->fields[i];
5204 key_field_test = hist_data_test->fields[i];
5206 if (key_field->flags != key_field_test->flags)
5208 if (!compatible_field(key_field->field, key_field_test->field))
5210 if (key_field->offset != key_field_test->offset)
5212 if (key_field->size != key_field_test->size)
5214 if (key_field->is_signed != key_field_test->is_signed)
5216 if (!!key_field->var.name != !!key_field_test->var.name)
5218 if (key_field->var.name &&
5219 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5223 for (i = 0; i < hist_data->n_sort_keys; i++) {
5224 sort_key = &hist_data->sort_keys[i];
5225 sort_key_test = &hist_data_test->sort_keys[i];
5227 if (sort_key->field_idx != sort_key_test->field_idx ||
5228 sort_key->descending != sort_key_test->descending)
5232 if (!ignore_filter && data->filter_str &&
5233 (strcmp(data->filter_str, data_test->filter_str) != 0))
5236 if (!actions_match(hist_data, hist_data_test))
5242 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5243 struct event_trigger_data *data,
5244 struct trace_event_file *file)
5246 struct hist_trigger_data *hist_data = data->private_data;
5247 struct event_trigger_data *test, *named_data = NULL;
5250 if (hist_data->attrs->name) {
5251 named_data = find_named_trigger(hist_data->attrs->name);
5253 if (!hist_trigger_match(data, named_data, named_data,
5255 hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name);
5262 if (hist_data->attrs->name && !named_data)
5265 list_for_each_entry_rcu(test, &file->triggers, list) {
5266 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5267 if (!hist_trigger_match(data, test, named_data, false))
5269 if (hist_data->attrs->pause)
5270 test->paused = true;
5271 else if (hist_data->attrs->cont)
5272 test->paused = false;
5273 else if (hist_data->attrs->clear)
5276 hist_err("Hist trigger already exists", NULL);
5283 if (hist_data->attrs->cont || hist_data->attrs->clear) {
5284 hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
5289 if (hist_data->attrs->pause)
5290 data->paused = true;
5293 data->private_data = named_data->private_data;
5294 set_named_trigger_data(data, named_data);
5295 data->ops = &event_hist_trigger_named_ops;
5298 if (data->ops->init) {
5299 ret = data->ops->init(data->ops, data);
5304 if (hist_data->enable_timestamps) {
5305 char *clock = hist_data->attrs->clock;
5307 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5309 hist_err("Couldn't set trace_clock: ", clock);
5313 tracing_set_time_stamp_abs(file->tr, true);
5317 destroy_hist_data(hist_data);
5324 static int hist_trigger_enable(struct event_trigger_data *data,
5325 struct trace_event_file *file)
5329 list_add_tail_rcu(&data->list, &file->triggers);
5331 update_cond_flag(file);
5333 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5334 list_del_rcu(&data->list);
5335 update_cond_flag(file);
5342 static bool have_hist_trigger_match(struct event_trigger_data *data,
5343 struct trace_event_file *file)
5345 struct hist_trigger_data *hist_data = data->private_data;
5346 struct event_trigger_data *test, *named_data = NULL;
5349 if (hist_data->attrs->name)
5350 named_data = find_named_trigger(hist_data->attrs->name);
5352 list_for_each_entry_rcu(test, &file->triggers, list) {
5353 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5354 if (hist_trigger_match(data, test, named_data, false)) {
5364 static bool hist_trigger_check_refs(struct event_trigger_data *data,
5365 struct trace_event_file *file)
5367 struct hist_trigger_data *hist_data = data->private_data;
5368 struct event_trigger_data *test, *named_data = NULL;
5370 if (hist_data->attrs->name)
5371 named_data = find_named_trigger(hist_data->attrs->name);
5373 list_for_each_entry_rcu(test, &file->triggers, list) {
5374 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5375 if (!hist_trigger_match(data, test, named_data, false))
5377 hist_data = test->private_data;
5378 if (check_var_refs(hist_data))
5387 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
5388 struct event_trigger_data *data,
5389 struct trace_event_file *file)
5391 struct hist_trigger_data *hist_data = data->private_data;
5392 struct event_trigger_data *test, *named_data = NULL;
5393 bool unregistered = false;
5395 if (hist_data->attrs->name)
5396 named_data = find_named_trigger(hist_data->attrs->name);
5398 list_for_each_entry_rcu(test, &file->triggers, list) {
5399 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5400 if (!hist_trigger_match(data, test, named_data, false))
5402 unregistered = true;
5403 list_del_rcu(&test->list);
5404 trace_event_trigger_enable_disable(file, 0);
5405 update_cond_flag(file);
5410 if (unregistered && test->ops->free)
5411 test->ops->free(test->ops, test);
5413 if (hist_data->enable_timestamps) {
5414 if (!hist_data->remove || unregistered)
5415 tracing_set_time_stamp_abs(file->tr, false);
5419 static bool hist_file_check_refs(struct trace_event_file *file)
5421 struct hist_trigger_data *hist_data;
5422 struct event_trigger_data *test;
5424 list_for_each_entry_rcu(test, &file->triggers, list) {
5425 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5426 hist_data = test->private_data;
5427 if (check_var_refs(hist_data))
5435 static void hist_unreg_all(struct trace_event_file *file)
5437 struct event_trigger_data *test, *n;
5438 struct hist_trigger_data *hist_data;
5439 struct synth_event *se;
5440 const char *se_name;
5442 if (hist_file_check_refs(file))
5445 list_for_each_entry_safe(test, n, &file->triggers, list) {
5446 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5447 hist_data = test->private_data;
5448 list_del_rcu(&test->list);
5449 trace_event_trigger_enable_disable(file, 0);
5451 mutex_lock(&synth_event_mutex);
5452 se_name = trace_event_name(file->event_call);
5453 se = find_synth_event(se_name);
5456 mutex_unlock(&synth_event_mutex);
5458 update_cond_flag(file);
5459 if (hist_data->enable_timestamps)
5460 tracing_set_time_stamp_abs(file->tr, false);
5461 if (test->ops->free)
5462 test->ops->free(test->ops, test);
5467 static int event_hist_trigger_func(struct event_command *cmd_ops,
5468 struct trace_event_file *file,
5469 char *glob, char *cmd, char *param)
5471 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
5472 struct event_trigger_data *trigger_data;
5473 struct hist_trigger_attrs *attrs;
5474 struct event_trigger_ops *trigger_ops;
5475 struct hist_trigger_data *hist_data;
5476 struct synth_event *se;
5477 const char *se_name;
5478 bool remove = false;
5482 if (glob && strlen(glob)) {
5483 last_cmd_set(param);
5494 * separate the trigger from the filter (k:v [if filter])
5495 * allowing for whitespace in the trigger
5497 p = trigger = param;
5499 p = strstr(p, "if");
5504 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
5508 if (p >= param + strlen(param) - strlen("if") - 1)
5510 if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') {
5521 param = strstrip(p);
5522 trigger = strstrip(trigger);
5525 attrs = parse_hist_trigger_attrs(trigger);
5527 return PTR_ERR(attrs);
5529 if (attrs->map_bits)
5530 hist_trigger_bits = attrs->map_bits;
5532 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
5533 if (IS_ERR(hist_data)) {
5534 destroy_hist_trigger_attrs(attrs);
5535 return PTR_ERR(hist_data);
5538 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
5540 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
5541 if (!trigger_data) {
5546 trigger_data->count = -1;
5547 trigger_data->ops = trigger_ops;
5548 trigger_data->cmd_ops = cmd_ops;
5550 INIT_LIST_HEAD(&trigger_data->list);
5551 RCU_INIT_POINTER(trigger_data->filter, NULL);
5553 trigger_data->private_data = hist_data;
5555 /* if param is non-empty, it's supposed to be a filter */
5556 if (param && cmd_ops->set_filter) {
5557 ret = cmd_ops->set_filter(param, trigger_data, file);
5563 if (!have_hist_trigger_match(trigger_data, file))
5566 if (hist_trigger_check_refs(trigger_data, file)) {
5571 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5573 mutex_lock(&synth_event_mutex);
5574 se_name = trace_event_name(file->event_call);
5575 se = find_synth_event(se_name);
5578 mutex_unlock(&synth_event_mutex);
5584 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
5586 * The above returns on success the # of triggers registered,
5587 * but if it didn't register any it returns zero. Consider no
5588 * triggers registered a failure too.
5591 if (!(attrs->pause || attrs->cont || attrs->clear))
5597 if (get_named_trigger_data(trigger_data))
5600 if (has_hist_vars(hist_data))
5601 save_hist_vars(hist_data);
5603 ret = create_actions(hist_data, file);
5607 ret = tracing_map_init(hist_data->map);
5611 ret = hist_trigger_enable(trigger_data, file);
5615 mutex_lock(&synth_event_mutex);
5616 se_name = trace_event_name(file->event_call);
5617 se = find_synth_event(se_name);
5620 mutex_unlock(&synth_event_mutex);
5622 /* Just return zero, not the number of registered triggers */
5630 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
5632 if (cmd_ops->set_filter)
5633 cmd_ops->set_filter(NULL, trigger_data, NULL);
5635 remove_hist_vars(hist_data);
5637 kfree(trigger_data);
5639 destroy_hist_data(hist_data);
5643 static struct event_command trigger_hist_cmd = {
5645 .trigger_type = ETT_EVENT_HIST,
5646 .flags = EVENT_CMD_FL_NEEDS_REC,
5647 .func = event_hist_trigger_func,
5648 .reg = hist_register_trigger,
5649 .unreg = hist_unregister_trigger,
5650 .unreg_all = hist_unreg_all,
5651 .get_trigger_ops = event_hist_get_trigger_ops,
5652 .set_filter = set_trigger_filter,
5655 __init int register_trigger_hist_cmd(void)
5659 ret = register_event_command(&trigger_hist_cmd);
5666 hist_enable_trigger(struct event_trigger_data *data, void *rec,
5667 struct ring_buffer_event *event)
5669 struct enable_trigger_data *enable_data = data->private_data;
5670 struct event_trigger_data *test;
5672 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
5673 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5674 if (enable_data->enable)
5675 test->paused = false;
5677 test->paused = true;
5683 hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
5684 struct ring_buffer_event *event)
5689 if (data->count != -1)
5692 hist_enable_trigger(data, rec, event);
5695 static struct event_trigger_ops hist_enable_trigger_ops = {
5696 .func = hist_enable_trigger,
5697 .print = event_enable_trigger_print,
5698 .init = event_trigger_init,
5699 .free = event_enable_trigger_free,
5702 static struct event_trigger_ops hist_enable_count_trigger_ops = {
5703 .func = hist_enable_count_trigger,
5704 .print = event_enable_trigger_print,
5705 .init = event_trigger_init,
5706 .free = event_enable_trigger_free,
5709 static struct event_trigger_ops hist_disable_trigger_ops = {
5710 .func = hist_enable_trigger,
5711 .print = event_enable_trigger_print,
5712 .init = event_trigger_init,
5713 .free = event_enable_trigger_free,
5716 static struct event_trigger_ops hist_disable_count_trigger_ops = {
5717 .func = hist_enable_count_trigger,
5718 .print = event_enable_trigger_print,
5719 .init = event_trigger_init,
5720 .free = event_enable_trigger_free,
5723 static struct event_trigger_ops *
5724 hist_enable_get_trigger_ops(char *cmd, char *param)
5726 struct event_trigger_ops *ops;
5729 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
5732 ops = param ? &hist_enable_count_trigger_ops :
5733 &hist_enable_trigger_ops;
5735 ops = param ? &hist_disable_count_trigger_ops :
5736 &hist_disable_trigger_ops;
5741 static void hist_enable_unreg_all(struct trace_event_file *file)
5743 struct event_trigger_data *test, *n;
5745 list_for_each_entry_safe(test, n, &file->triggers, list) {
5746 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
5747 list_del_rcu(&test->list);
5748 update_cond_flag(file);
5749 trace_event_trigger_enable_disable(file, 0);
5750 if (test->ops->free)
5751 test->ops->free(test->ops, test);
5756 static struct event_command trigger_hist_enable_cmd = {
5757 .name = ENABLE_HIST_STR,
5758 .trigger_type = ETT_HIST_ENABLE,
5759 .func = event_enable_trigger_func,
5760 .reg = event_enable_register_trigger,
5761 .unreg = event_enable_unregister_trigger,
5762 .unreg_all = hist_enable_unreg_all,
5763 .get_trigger_ops = hist_enable_get_trigger_ops,
5764 .set_filter = set_trigger_filter,
5767 static struct event_command trigger_hist_disable_cmd = {
5768 .name = DISABLE_HIST_STR,
5769 .trigger_type = ETT_HIST_ENABLE,
5770 .func = event_enable_trigger_func,
5771 .reg = event_enable_register_trigger,
5772 .unreg = event_enable_unregister_trigger,
5773 .unreg_all = hist_enable_unreg_all,
5774 .get_trigger_ops = hist_enable_get_trigger_ops,
5775 .set_filter = set_trigger_filter,
5778 static __init void unregister_trigger_hist_enable_disable_cmds(void)
5780 unregister_event_command(&trigger_hist_enable_cmd);
5781 unregister_event_command(&trigger_hist_disable_cmd);
5784 __init int register_trigger_hist_enable_disable_cmds(void)
5788 ret = register_event_command(&trigger_hist_enable_cmd);
5789 if (WARN_ON(ret < 0))
5791 ret = register_event_command(&trigger_hist_disable_cmd);
5792 if (WARN_ON(ret < 0))
5793 unregister_trigger_hist_enable_disable_cmds();
5798 static __init int trace_events_hist_init(void)
5800 struct dentry *entry = NULL;
5801 struct dentry *d_tracer;
5804 d_tracer = tracing_init_dentry();
5805 if (IS_ERR(d_tracer)) {
5806 err = PTR_ERR(d_tracer);
5810 entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
5811 NULL, &synth_events_fops);
5819 pr_warn("Could not create tracefs 'synthetic_events' entry\n");
5824 fs_initcall(trace_events_hist_init);