1 // SPDX-License-Identifier: GPL-2.0
3 * trace_events_hist - trace event hist triggers
5 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
8 #include <linux/module.h>
9 #include <linux/kallsyms.h>
10 #include <linux/security.h>
11 #include <linux/mutex.h>
12 #include <linux/slab.h>
13 #include <linux/stacktrace.h>
14 #include <linux/rculist.h>
15 #include <linux/tracefs.h>
17 /* for gfp flag names */
18 #include <linux/trace_events.h>
19 #include <trace/events/mmflags.h>
21 #include "tracing_map.h"
23 #include "trace_dynevent.h"
25 #define SYNTH_SYSTEM "synthetic"
26 #define SYNTH_FIELDS_MAX 32
28 #define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
31 C(NONE, "No error"), \
32 C(DUPLICATE_VAR, "Variable already defined"), \
33 C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
34 C(TOO_MANY_VARS, "Too many variables defined"), \
35 C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
36 C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
37 C(TRIGGER_EEXIST, "Hist trigger already exists"), \
38 C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
39 C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
40 C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
41 C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
42 C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
43 C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
44 C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
45 C(HIST_NOT_FOUND, "Matching event histogram not found"), \
46 C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
47 C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
48 C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
49 C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
50 C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
51 C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
52 C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
53 C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
54 C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
55 C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
56 C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
57 C(TOO_MANY_PARAMS, "Too many action params"), \
58 C(PARAM_NOT_FOUND, "Couldn't find param"), \
59 C(INVALID_PARAM, "Invalid action param"), \
60 C(ACTION_NOT_FOUND, "No action found"), \
61 C(NO_SAVE_PARAMS, "No params found for save()"), \
62 C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
63 C(ACTION_MISMATCH, "Handler doesn't support action"), \
64 C(NO_CLOSING_PAREN, "No closing paren found"), \
65 C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
66 C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
67 C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
68 C(VAR_NOT_FOUND, "Couldn't find variable"), \
69 C(FIELD_NOT_FOUND, "Couldn't find field"),
72 #define C(a, b) HIST_ERR_##a
79 static const char *err_text[] = { ERRORS };
83 typedef u64 (*hist_field_fn_t) (struct hist_field *field,
84 struct tracing_map_elt *elt,
85 struct ring_buffer_event *rbe,
88 #define HIST_FIELD_OPERANDS_MAX 2
89 #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
90 #define HIST_ACTIONS_MAX 8
100 * A hist_var (histogram variable) contains variable information for
101 * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
102 * flag set. A hist_var has a variable name e.g. ts0, and is
103 * associated with a given histogram trigger, as specified by
104 * hist_data. The hist_var idx is the unique index assigned to the
105 * variable by the hist trigger's tracing_map. The idx is what is
106 * used to set a variable's value and, by a variable reference, to
111 struct hist_trigger_data *hist_data;
116 struct ftrace_event_field *field;
121 unsigned int is_signed;
123 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
124 struct hist_trigger_data *hist_data;
127 * Variable fields contain variable-specific info in var.
130 enum field_op_id operator;
135 * The name field is used for EXPR and VAR_REF fields. VAR
136 * fields contain the variable name in var.name.
141 * When a histogram trigger is hit, if it has any references
142 * to variables, the values of those variables are collected
143 * into a var_ref_vals array by resolve_var_refs(). The
144 * current value of each variable is read from the tracing_map
145 * using the hist field's hist_var.idx and entered into the
146 * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
148 unsigned int var_ref_idx;
152 static u64 hist_field_none(struct hist_field *field,
153 struct tracing_map_elt *elt,
154 struct ring_buffer_event *rbe,
160 static u64 hist_field_counter(struct hist_field *field,
161 struct tracing_map_elt *elt,
162 struct ring_buffer_event *rbe,
168 static u64 hist_field_string(struct hist_field *hist_field,
169 struct tracing_map_elt *elt,
170 struct ring_buffer_event *rbe,
173 char *addr = (char *)(event + hist_field->field->offset);
175 return (u64)(unsigned long)addr;
178 static u64 hist_field_dynstring(struct hist_field *hist_field,
179 struct tracing_map_elt *elt,
180 struct ring_buffer_event *rbe,
183 u32 str_item = *(u32 *)(event + hist_field->field->offset);
184 int str_loc = str_item & 0xffff;
185 char *addr = (char *)(event + str_loc);
187 return (u64)(unsigned long)addr;
190 static u64 hist_field_pstring(struct hist_field *hist_field,
191 struct tracing_map_elt *elt,
192 struct ring_buffer_event *rbe,
195 char **addr = (char **)(event + hist_field->field->offset);
197 return (u64)(unsigned long)*addr;
200 static u64 hist_field_log2(struct hist_field *hist_field,
201 struct tracing_map_elt *elt,
202 struct ring_buffer_event *rbe,
205 struct hist_field *operand = hist_field->operands[0];
207 u64 val = operand->fn(operand, elt, rbe, event);
209 return (u64) ilog2(roundup_pow_of_two(val));
212 static u64 hist_field_plus(struct hist_field *hist_field,
213 struct tracing_map_elt *elt,
214 struct ring_buffer_event *rbe,
217 struct hist_field *operand1 = hist_field->operands[0];
218 struct hist_field *operand2 = hist_field->operands[1];
220 u64 val1 = operand1->fn(operand1, elt, rbe, event);
221 u64 val2 = operand2->fn(operand2, elt, rbe, event);
226 static u64 hist_field_minus(struct hist_field *hist_field,
227 struct tracing_map_elt *elt,
228 struct ring_buffer_event *rbe,
231 struct hist_field *operand1 = hist_field->operands[0];
232 struct hist_field *operand2 = hist_field->operands[1];
234 u64 val1 = operand1->fn(operand1, elt, rbe, event);
235 u64 val2 = operand2->fn(operand2, elt, rbe, event);
240 static u64 hist_field_unary_minus(struct hist_field *hist_field,
241 struct tracing_map_elt *elt,
242 struct ring_buffer_event *rbe,
245 struct hist_field *operand = hist_field->operands[0];
247 s64 sval = (s64)operand->fn(operand, elt, rbe, event);
248 u64 val = (u64)-sval;
253 #define DEFINE_HIST_FIELD_FN(type) \
254 static u64 hist_field_##type(struct hist_field *hist_field, \
255 struct tracing_map_elt *elt, \
256 struct ring_buffer_event *rbe, \
259 type *addr = (type *)(event + hist_field->field->offset); \
261 return (u64)(unsigned long)*addr; \
264 DEFINE_HIST_FIELD_FN(s64);
265 DEFINE_HIST_FIELD_FN(u64);
266 DEFINE_HIST_FIELD_FN(s32);
267 DEFINE_HIST_FIELD_FN(u32);
268 DEFINE_HIST_FIELD_FN(s16);
269 DEFINE_HIST_FIELD_FN(u16);
270 DEFINE_HIST_FIELD_FN(s8);
271 DEFINE_HIST_FIELD_FN(u8);
273 #define for_each_hist_field(i, hist_data) \
274 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
276 #define for_each_hist_val_field(i, hist_data) \
277 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
279 #define for_each_hist_key_field(i, hist_data) \
280 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
282 #define HIST_STACKTRACE_DEPTH 16
283 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
284 #define HIST_STACKTRACE_SKIP 5
286 #define HITCOUNT_IDX 0
287 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
289 enum hist_field_flags {
290 HIST_FIELD_FL_HITCOUNT = 1 << 0,
291 HIST_FIELD_FL_KEY = 1 << 1,
292 HIST_FIELD_FL_STRING = 1 << 2,
293 HIST_FIELD_FL_HEX = 1 << 3,
294 HIST_FIELD_FL_SYM = 1 << 4,
295 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
296 HIST_FIELD_FL_EXECNAME = 1 << 6,
297 HIST_FIELD_FL_SYSCALL = 1 << 7,
298 HIST_FIELD_FL_STACKTRACE = 1 << 8,
299 HIST_FIELD_FL_LOG2 = 1 << 9,
300 HIST_FIELD_FL_TIMESTAMP = 1 << 10,
301 HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
302 HIST_FIELD_FL_VAR = 1 << 12,
303 HIST_FIELD_FL_EXPR = 1 << 13,
304 HIST_FIELD_FL_VAR_REF = 1 << 14,
305 HIST_FIELD_FL_CPU = 1 << 15,
306 HIST_FIELD_FL_ALIAS = 1 << 16,
311 char *name[TRACING_MAP_VARS_MAX];
312 char *expr[TRACING_MAP_VARS_MAX];
315 struct hist_trigger_attrs {
325 unsigned int map_bits;
327 char *assignment_str[TRACING_MAP_VARS_MAX];
328 unsigned int n_assignments;
330 char *action_str[HIST_ACTIONS_MAX];
331 unsigned int n_actions;
333 struct var_defs var_defs;
337 struct hist_field *var;
338 struct hist_field *val;
341 struct field_var_hist {
342 struct hist_trigger_data *hist_data;
346 struct hist_trigger_data {
347 struct hist_field *fields[HIST_FIELDS_MAX];
350 unsigned int n_fields;
352 unsigned int key_size;
353 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
354 unsigned int n_sort_keys;
355 struct trace_event_file *event_file;
356 struct hist_trigger_attrs *attrs;
357 struct tracing_map *map;
358 bool enable_timestamps;
360 struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
361 unsigned int n_var_refs;
363 struct action_data *actions[HIST_ACTIONS_MAX];
364 unsigned int n_actions;
366 struct field_var *field_vars[SYNTH_FIELDS_MAX];
367 unsigned int n_field_vars;
368 unsigned int n_field_var_str;
369 struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
370 unsigned int n_field_var_hists;
372 struct field_var *save_vars[SYNTH_FIELDS_MAX];
373 unsigned int n_save_vars;
374 unsigned int n_save_var_str;
377 static int synth_event_create(int argc, const char **argv);
378 static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
379 static int synth_event_release(struct dyn_event *ev);
380 static bool synth_event_is_busy(struct dyn_event *ev);
381 static bool synth_event_match(const char *system, const char *event,
382 int argc, const char **argv, struct dyn_event *ev);
384 static struct dyn_event_operations synth_event_ops = {
385 .create = synth_event_create,
386 .show = synth_event_show,
387 .is_busy = synth_event_is_busy,
388 .free = synth_event_release,
389 .match = synth_event_match,
401 struct dyn_event devent;
404 struct synth_field **fields;
405 unsigned int n_fields;
407 struct trace_event_class class;
408 struct trace_event_call call;
409 struct tracepoint *tp;
412 static bool is_synth_event(struct dyn_event *ev)
414 return ev->ops == &synth_event_ops;
417 static struct synth_event *to_synth_event(struct dyn_event *ev)
419 return container_of(ev, struct synth_event, devent);
422 static bool synth_event_is_busy(struct dyn_event *ev)
424 struct synth_event *event = to_synth_event(ev);
426 return event->ref != 0;
429 static bool synth_event_match(const char *system, const char *event,
430 int argc, const char **argv, struct dyn_event *ev)
432 struct synth_event *sev = to_synth_event(ev);
434 return strcmp(sev->name, event) == 0 &&
435 (!system || strcmp(system, SYNTH_SYSTEM) == 0);
440 typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
441 struct tracing_map_elt *elt, void *rec,
442 struct ring_buffer_event *rbe, void *key,
443 struct action_data *data, u64 *var_ref_vals);
445 typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
460 enum handler_id handler;
461 enum action_id action;
465 unsigned int n_params;
466 char *params[SYNTH_FIELDS_MAX];
469 * When a histogram trigger is hit, the values of any
470 * references to variables, including variables being passed
471 * as parameters to synthetic events, are collected into a
472 * var_ref_vals array. This var_ref_idx is the index of the
473 * first param in the array to be passed to the synthetic
476 unsigned int var_ref_idx;
477 struct synth_event *synth_event;
478 bool use_trace_keyword;
479 char *synth_event_name;
489 * var_str contains the $-unstripped variable
490 * name referenced by var_ref, and used when
491 * printing the action. Because var_ref
492 * creation is deferred to create_actions(),
493 * we need a per-action way to save it until
494 * then, thus var_str.
499 * var_ref refers to the variable being
500 * tracked e.g onmax($var).
502 struct hist_field *var_ref;
505 * track_var contains the 'invisible' tracking
506 * variable created to keep the current
509 struct hist_field *track_var;
511 check_track_val_fn_t check_val;
512 action_fn_t save_data;
521 unsigned int key_len;
523 struct tracing_map_elt elt;
525 struct action_data *action_data;
526 struct hist_trigger_data *hist_data;
529 struct hist_elt_data {
532 char *field_var_str[SYNTH_FIELDS_MAX];
535 struct snapshot_context {
536 struct tracing_map_elt *elt;
540 static void track_data_free(struct track_data *track_data)
542 struct hist_elt_data *elt_data;
547 kfree(track_data->key);
549 elt_data = track_data->elt.private_data;
551 kfree(elt_data->comm);
558 static struct track_data *track_data_alloc(unsigned int key_len,
559 struct action_data *action_data,
560 struct hist_trigger_data *hist_data)
562 struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
563 struct hist_elt_data *elt_data;
566 return ERR_PTR(-ENOMEM);
568 data->key = kzalloc(key_len, GFP_KERNEL);
570 track_data_free(data);
571 return ERR_PTR(-ENOMEM);
574 data->key_len = key_len;
575 data->action_data = action_data;
576 data->hist_data = hist_data;
578 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
580 track_data_free(data);
581 return ERR_PTR(-ENOMEM);
583 data->elt.private_data = elt_data;
585 elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
586 if (!elt_data->comm) {
587 track_data_free(data);
588 return ERR_PTR(-ENOMEM);
594 static char last_cmd[MAX_FILTER_STR_VAL];
595 static char last_cmd_loc[MAX_FILTER_STR_VAL];
597 static int errpos(char *str)
599 return err_pos(last_cmd, str);
602 static void last_cmd_set(struct trace_event_file *file, char *str)
604 const char *system = NULL, *name = NULL;
605 struct trace_event_call *call;
610 strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
613 call = file->event_call;
615 system = call->class->system;
617 name = trace_event_name(call);
624 snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
627 static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
629 tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
633 static void hist_err_clear(void)
636 last_cmd_loc[0] = '\0';
639 struct synth_trace_event {
640 struct trace_entry ent;
644 static int synth_event_define_fields(struct trace_event_call *call)
646 struct synth_trace_event trace;
647 int offset = offsetof(typeof(trace), fields);
648 struct synth_event *event = call->data;
649 unsigned int i, size, n_u64;
654 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
655 size = event->fields[i]->size;
656 is_signed = event->fields[i]->is_signed;
657 type = event->fields[i]->type;
658 name = event->fields[i]->name;
659 ret = trace_define_field(call, type, name, offset, size,
660 is_signed, FILTER_OTHER);
664 if (event->fields[i]->is_string) {
665 offset += STR_VAR_LEN_MAX;
666 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
668 offset += sizeof(u64);
673 event->n_u64 = n_u64;
678 static bool synth_field_signed(char *type)
680 if (str_has_prefix(type, "u"))
682 if (strcmp(type, "gfp_t") == 0)
688 static int synth_field_is_string(char *type)
690 if (strstr(type, "char[") != NULL)
696 static int synth_field_string_size(char *type)
698 char buf[4], *end, *start;
702 start = strstr(type, "char[");
705 start += sizeof("char[") - 1;
707 end = strchr(type, ']');
708 if (!end || end < start)
715 strncpy(buf, start, len);
718 err = kstrtouint(buf, 0, &size);
722 if (size > STR_VAR_LEN_MAX)
728 static int synth_field_size(char *type)
732 if (strcmp(type, "s64") == 0)
734 else if (strcmp(type, "u64") == 0)
736 else if (strcmp(type, "s32") == 0)
738 else if (strcmp(type, "u32") == 0)
740 else if (strcmp(type, "s16") == 0)
742 else if (strcmp(type, "u16") == 0)
744 else if (strcmp(type, "s8") == 0)
746 else if (strcmp(type, "u8") == 0)
748 else if (strcmp(type, "char") == 0)
750 else if (strcmp(type, "unsigned char") == 0)
751 size = sizeof(unsigned char);
752 else if (strcmp(type, "int") == 0)
754 else if (strcmp(type, "unsigned int") == 0)
755 size = sizeof(unsigned int);
756 else if (strcmp(type, "long") == 0)
758 else if (strcmp(type, "unsigned long") == 0)
759 size = sizeof(unsigned long);
760 else if (strcmp(type, "pid_t") == 0)
761 size = sizeof(pid_t);
762 else if (strcmp(type, "gfp_t") == 0)
763 size = sizeof(gfp_t);
764 else if (synth_field_is_string(type))
765 size = synth_field_string_size(type);
770 static const char *synth_field_fmt(char *type)
772 const char *fmt = "%llu";
774 if (strcmp(type, "s64") == 0)
776 else if (strcmp(type, "u64") == 0)
778 else if (strcmp(type, "s32") == 0)
780 else if (strcmp(type, "u32") == 0)
782 else if (strcmp(type, "s16") == 0)
784 else if (strcmp(type, "u16") == 0)
786 else if (strcmp(type, "s8") == 0)
788 else if (strcmp(type, "u8") == 0)
790 else if (strcmp(type, "char") == 0)
792 else if (strcmp(type, "unsigned char") == 0)
794 else if (strcmp(type, "int") == 0)
796 else if (strcmp(type, "unsigned int") == 0)
798 else if (strcmp(type, "long") == 0)
800 else if (strcmp(type, "unsigned long") == 0)
802 else if (strcmp(type, "pid_t") == 0)
804 else if (strcmp(type, "gfp_t") == 0)
806 else if (synth_field_is_string(type))
812 static enum print_line_t print_synth_event(struct trace_iterator *iter,
814 struct trace_event *event)
816 struct trace_array *tr = iter->tr;
817 struct trace_seq *s = &iter->seq;
818 struct synth_trace_event *entry;
819 struct synth_event *se;
820 unsigned int i, n_u64;
824 entry = (struct synth_trace_event *)iter->ent;
825 se = container_of(event, struct synth_event, call.event);
827 trace_seq_printf(s, "%s: ", se->name);
829 for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
830 if (trace_seq_has_overflowed(s))
833 fmt = synth_field_fmt(se->fields[i]->type);
835 /* parameter types */
836 if (tr && tr->trace_flags & TRACE_ITER_VERBOSE)
837 trace_seq_printf(s, "%s ", fmt);
839 snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
841 /* parameter values */
842 if (se->fields[i]->is_string) {
843 trace_seq_printf(s, print_fmt, se->fields[i]->name,
844 (char *)&entry->fields[n_u64],
845 i == se->n_fields - 1 ? "" : " ");
846 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
848 struct trace_print_flags __flags[] = {
849 __def_gfpflag_names, {-1, NULL} };
851 trace_seq_printf(s, print_fmt, se->fields[i]->name,
852 entry->fields[n_u64],
853 i == se->n_fields - 1 ? "" : " ");
855 if (strcmp(se->fields[i]->type, "gfp_t") == 0) {
856 trace_seq_puts(s, " (");
857 trace_print_flags_seq(s, "|",
858 entry->fields[n_u64],
860 trace_seq_putc(s, ')');
866 trace_seq_putc(s, '\n');
868 return trace_handle_return(s);
871 static struct trace_event_functions synth_event_funcs = {
872 .trace = print_synth_event
875 static notrace void trace_event_raw_event_synth(void *__data,
877 unsigned int var_ref_idx)
879 struct trace_event_file *trace_file = __data;
880 struct synth_trace_event *entry;
881 struct trace_event_buffer fbuffer;
882 struct trace_buffer *buffer;
883 struct synth_event *event;
884 unsigned int i, n_u64;
887 event = trace_file->event_call->data;
889 if (trace_trigger_soft_disabled(trace_file))
892 fields_size = event->n_u64 * sizeof(u64);
895 * Avoid ring buffer recursion detection, as this event
896 * is being performed within another event.
898 buffer = trace_file->tr->array_buffer.buffer;
899 ring_buffer_nest_start(buffer);
901 entry = trace_event_buffer_reserve(&fbuffer, trace_file,
902 sizeof(*entry) + fields_size);
906 for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
907 if (event->fields[i]->is_string) {
908 char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
909 char *str_field = (char *)&entry->fields[n_u64];
911 strscpy(str_field, str_val, STR_VAR_LEN_MAX);
912 n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
914 struct synth_field *field = event->fields[i];
915 u64 val = var_ref_vals[var_ref_idx + i];
917 switch (field->size) {
919 *(u8 *)&entry->fields[n_u64] = (u8)val;
923 *(u16 *)&entry->fields[n_u64] = (u16)val;
927 *(u32 *)&entry->fields[n_u64] = (u32)val;
931 entry->fields[n_u64] = val;
938 trace_event_buffer_commit(&fbuffer);
940 ring_buffer_nest_end(buffer);
943 static void free_synth_event_print_fmt(struct trace_event_call *call)
946 kfree(call->print_fmt);
947 call->print_fmt = NULL;
951 static int __set_synth_event_print_fmt(struct synth_event *event,
958 /* When len=0, we just calculate the needed length */
959 #define LEN_OR_ZERO (len ? len - pos : 0)
961 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
962 for (i = 0; i < event->n_fields; i++) {
963 fmt = synth_field_fmt(event->fields[i]->type);
964 pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
965 event->fields[i]->name, fmt,
966 i == event->n_fields - 1 ? "" : ", ");
968 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
970 for (i = 0; i < event->n_fields; i++) {
971 pos += snprintf(buf + pos, LEN_OR_ZERO,
972 ", REC->%s", event->fields[i]->name);
977 /* return the length of print_fmt */
981 static int set_synth_event_print_fmt(struct trace_event_call *call)
983 struct synth_event *event = call->data;
987 /* First: called with 0 length to calculate the needed length */
988 len = __set_synth_event_print_fmt(event, NULL, 0);
990 print_fmt = kmalloc(len + 1, GFP_KERNEL);
994 /* Second: actually write the @print_fmt */
995 __set_synth_event_print_fmt(event, print_fmt, len + 1);
996 call->print_fmt = print_fmt;
1001 static void free_synth_field(struct synth_field *field)
1008 static struct synth_field *parse_synth_field(int argc, const char **argv,
1011 struct synth_field *field;
1012 const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
1015 if (field_type[0] == ';')
1018 if (!strcmp(field_type, "unsigned")) {
1020 return ERR_PTR(-EINVAL);
1021 prefix = "unsigned ";
1022 field_type = argv[1];
1023 field_name = argv[2];
1026 field_name = argv[1];
1030 field = kzalloc(sizeof(*field), GFP_KERNEL);
1032 return ERR_PTR(-ENOMEM);
1034 len = strlen(field_name);
1035 array = strchr(field_name, '[');
1037 len -= strlen(array);
1038 else if (field_name[len - 1] == ';')
1041 field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
1047 if (field_type[0] == ';')
1049 len = strlen(field_type) + 1;
1051 len += strlen(array);
1053 len += strlen(prefix);
1055 field->type = kzalloc(len, GFP_KERNEL);
1061 strcat(field->type, prefix);
1062 strcat(field->type, field_type);
1064 strcat(field->type, array);
1065 if (field->type[len - 1] == ';')
1066 field->type[len - 1] = '\0';
1069 field->size = synth_field_size(field->type);
1075 if (synth_field_is_string(field->type))
1076 field->is_string = true;
1078 field->is_signed = synth_field_signed(field->type);
1083 free_synth_field(field);
1084 field = ERR_PTR(ret);
1088 static void free_synth_tracepoint(struct tracepoint *tp)
1097 static struct tracepoint *alloc_synth_tracepoint(char *name)
1099 struct tracepoint *tp;
1101 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
1103 return ERR_PTR(-ENOMEM);
1105 tp->name = kstrdup(name, GFP_KERNEL);
1108 return ERR_PTR(-ENOMEM);
1114 typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
1115 unsigned int var_ref_idx);
1117 static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
1118 unsigned int var_ref_idx)
1120 struct tracepoint *tp = event->tp;
1122 if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
1123 struct tracepoint_func *probe_func_ptr;
1124 synth_probe_func_t probe_func;
1127 if (!(cpu_online(raw_smp_processor_id())))
1130 probe_func_ptr = rcu_dereference_sched((tp)->funcs);
1131 if (probe_func_ptr) {
1133 probe_func = probe_func_ptr->func;
1134 __data = probe_func_ptr->data;
1135 probe_func(__data, var_ref_vals, var_ref_idx);
1136 } while ((++probe_func_ptr)->func);
1141 static struct synth_event *find_synth_event(const char *name)
1143 struct dyn_event *pos;
1144 struct synth_event *event;
1146 for_each_dyn_event(pos) {
1147 if (!is_synth_event(pos))
1149 event = to_synth_event(pos);
1150 if (strcmp(event->name, name) == 0)
1157 static int register_synth_event(struct synth_event *event)
1159 struct trace_event_call *call = &event->call;
1162 event->call.class = &event->class;
1163 event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
1164 if (!event->class.system) {
1169 event->tp = alloc_synth_tracepoint(event->name);
1170 if (IS_ERR(event->tp)) {
1171 ret = PTR_ERR(event->tp);
1176 INIT_LIST_HEAD(&call->class->fields);
1177 call->event.funcs = &synth_event_funcs;
1178 call->class->define_fields = synth_event_define_fields;
1180 ret = register_trace_event(&call->event);
1185 call->flags = TRACE_EVENT_FL_TRACEPOINT;
1186 call->class->reg = trace_event_reg;
1187 call->class->probe = trace_event_raw_event_synth;
1189 call->tp = event->tp;
1191 ret = trace_add_event_call(call);
1193 pr_warn("Failed to register synthetic event: %s\n",
1194 trace_event_name(call));
1198 ret = set_synth_event_print_fmt(call);
1200 trace_remove_event_call(call);
1206 unregister_trace_event(&call->event);
1210 static int unregister_synth_event(struct synth_event *event)
1212 struct trace_event_call *call = &event->call;
1215 ret = trace_remove_event_call(call);
1220 static void free_synth_event(struct synth_event *event)
1227 for (i = 0; i < event->n_fields; i++)
1228 free_synth_field(event->fields[i]);
1230 kfree(event->fields);
1232 kfree(event->class.system);
1233 free_synth_tracepoint(event->tp);
1234 free_synth_event_print_fmt(&event->call);
1238 static struct synth_event *alloc_synth_event(const char *name, int n_fields,
1239 struct synth_field **fields)
1241 struct synth_event *event;
1244 event = kzalloc(sizeof(*event), GFP_KERNEL);
1246 event = ERR_PTR(-ENOMEM);
1250 event->name = kstrdup(name, GFP_KERNEL);
1253 event = ERR_PTR(-ENOMEM);
1257 event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
1258 if (!event->fields) {
1259 free_synth_event(event);
1260 event = ERR_PTR(-ENOMEM);
1264 dyn_event_init(&event->devent, &synth_event_ops);
1266 for (i = 0; i < n_fields; i++)
1267 event->fields[i] = fields[i];
1269 event->n_fields = n_fields;
1274 static void action_trace(struct hist_trigger_data *hist_data,
1275 struct tracing_map_elt *elt, void *rec,
1276 struct ring_buffer_event *rbe, void *key,
1277 struct action_data *data, u64 *var_ref_vals)
1279 struct synth_event *event = data->synth_event;
1281 trace_synth(event, var_ref_vals, data->var_ref_idx);
1284 struct hist_var_data {
1285 struct list_head list;
1286 struct hist_trigger_data *hist_data;
1289 static int __create_synth_event(int argc, const char *name, const char **argv)
1291 struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
1292 struct synth_event *event = NULL;
1293 int i, consumed = 0, n_fields = 0, ret = 0;
1297 * - Add synthetic event: <event_name> field[;field] ...
1298 * - Remove synthetic event: !<event_name> field[;field] ...
1299 * where 'field' = type field_name
1302 if (name[0] == '\0' || argc < 1)
1305 mutex_lock(&event_mutex);
1307 event = find_synth_event(name);
1313 for (i = 0; i < argc - 1; i++) {
1314 if (strcmp(argv[i], ";") == 0)
1316 if (n_fields == SYNTH_FIELDS_MAX) {
1321 field = parse_synth_field(argc - i, &argv[i], &consumed);
1322 if (IS_ERR(field)) {
1323 ret = PTR_ERR(field);
1326 fields[n_fields++] = field;
1330 if (i < argc && strcmp(argv[i], ";") != 0) {
1335 event = alloc_synth_event(name, n_fields, fields);
1336 if (IS_ERR(event)) {
1337 ret = PTR_ERR(event);
1341 ret = register_synth_event(event);
1343 dyn_event_add(&event->devent);
1345 free_synth_event(event);
1347 mutex_unlock(&event_mutex);
1351 for (i = 0; i < n_fields; i++)
1352 free_synth_field(fields[i]);
1357 static int create_or_delete_synth_event(int argc, char **argv)
1359 const char *name = argv[0];
1360 struct synth_event *event = NULL;
1363 /* trace_run_command() ensures argc != 0 */
1364 if (name[0] == '!') {
1365 mutex_lock(&event_mutex);
1366 event = find_synth_event(name + 1);
1371 ret = unregister_synth_event(event);
1373 dyn_event_remove(&event->devent);
1374 free_synth_event(event);
1379 mutex_unlock(&event_mutex);
1383 ret = __create_synth_event(argc - 1, name, (const char **)argv + 1);
1384 return ret == -ECANCELED ? -EINVAL : ret;
1387 static int synth_event_create(int argc, const char **argv)
1389 const char *name = argv[0];
1392 if (name[0] != 's' || name[1] != ':')
1396 /* This interface accepts group name prefix */
1397 if (strchr(name, '/')) {
1398 len = str_has_prefix(name, SYNTH_SYSTEM "/");
1403 return __create_synth_event(argc - 1, name, argv + 1);
1406 static int synth_event_release(struct dyn_event *ev)
1408 struct synth_event *event = to_synth_event(ev);
1414 ret = unregister_synth_event(event);
1418 dyn_event_remove(ev);
1419 free_synth_event(event);
1423 static int __synth_event_show(struct seq_file *m, struct synth_event *event)
1425 struct synth_field *field;
1428 seq_printf(m, "%s\t", event->name);
1430 for (i = 0; i < event->n_fields; i++) {
1431 field = event->fields[i];
1433 /* parameter values */
1434 seq_printf(m, "%s %s%s", field->type, field->name,
1435 i == event->n_fields - 1 ? "" : "; ");
1443 static int synth_event_show(struct seq_file *m, struct dyn_event *ev)
1445 struct synth_event *event = to_synth_event(ev);
1447 seq_printf(m, "s:%s/", event->class.system);
1449 return __synth_event_show(m, event);
1452 static int synth_events_seq_show(struct seq_file *m, void *v)
1454 struct dyn_event *ev = v;
1456 if (!is_synth_event(ev))
1459 return __synth_event_show(m, to_synth_event(ev));
1462 static const struct seq_operations synth_events_seq_op = {
1463 .start = dyn_event_seq_start,
1464 .next = dyn_event_seq_next,
1465 .stop = dyn_event_seq_stop,
1466 .show = synth_events_seq_show,
1469 static int synth_events_open(struct inode *inode, struct file *file)
1473 ret = security_locked_down(LOCKDOWN_TRACEFS);
1477 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
1478 ret = dyn_events_release_all(&synth_event_ops);
1483 return seq_open(file, &synth_events_seq_op);
1486 static ssize_t synth_events_write(struct file *file,
1487 const char __user *buffer,
1488 size_t count, loff_t *ppos)
1490 return trace_parse_run_command(file, buffer, count, ppos,
1491 create_or_delete_synth_event);
1494 static const struct file_operations synth_events_fops = {
1495 .open = synth_events_open,
1496 .write = synth_events_write,
1498 .llseek = seq_lseek,
1499 .release = seq_release,
1502 static u64 hist_field_timestamp(struct hist_field *hist_field,
1503 struct tracing_map_elt *elt,
1504 struct ring_buffer_event *rbe,
1507 struct hist_trigger_data *hist_data = hist_field->hist_data;
1508 struct trace_array *tr = hist_data->event_file->tr;
1510 u64 ts = ring_buffer_event_time_stamp(rbe);
1512 if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
1518 static u64 hist_field_cpu(struct hist_field *hist_field,
1519 struct tracing_map_elt *elt,
1520 struct ring_buffer_event *rbe,
1523 int cpu = smp_processor_id();
1529 * check_field_for_var_ref - Check if a VAR_REF field references a variable
1530 * @hist_field: The VAR_REF field to check
1531 * @var_data: The hist trigger that owns the variable
1532 * @var_idx: The trigger variable identifier
1534 * Check the given VAR_REF field to see whether or not it references
1535 * the given variable associated with the given trigger.
1537 * Return: The VAR_REF field if it does reference the variable, NULL if not
1539 static struct hist_field *
1540 check_field_for_var_ref(struct hist_field *hist_field,
1541 struct hist_trigger_data *var_data,
1542 unsigned int var_idx)
1544 WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
1546 if (hist_field && hist_field->var.idx == var_idx &&
1547 hist_field->var.hist_data == var_data)
1554 * find_var_ref - Check if a trigger has a reference to a trigger variable
1555 * @hist_data: The hist trigger that might have a reference to the variable
1556 * @var_data: The hist trigger that owns the variable
1557 * @var_idx: The trigger variable identifier
1559 * Check the list of var_refs[] on the first hist trigger to see
1560 * whether any of them are references to the variable on the second
1563 * Return: The VAR_REF field referencing the variable if so, NULL if not
1565 static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
1566 struct hist_trigger_data *var_data,
1567 unsigned int var_idx)
1569 struct hist_field *hist_field;
1572 for (i = 0; i < hist_data->n_var_refs; i++) {
1573 hist_field = hist_data->var_refs[i];
1574 if (check_field_for_var_ref(hist_field, var_data, var_idx))
1582 * find_any_var_ref - Check if there is a reference to a given trigger variable
1583 * @hist_data: The hist trigger
1584 * @var_idx: The trigger variable identifier
1586 * Check to see whether the given variable is currently referenced by
1587 * any other trigger.
1589 * The trigger the variable is defined on is explicitly excluded - the
1590 * assumption being that a self-reference doesn't prevent a trigger
1591 * from being removed.
1593 * Return: The VAR_REF field referencing the variable if so, NULL if not
1595 static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
1596 unsigned int var_idx)
1598 struct trace_array *tr = hist_data->event_file->tr;
1599 struct hist_field *found = NULL;
1600 struct hist_var_data *var_data;
1602 list_for_each_entry(var_data, &tr->hist_vars, list) {
1603 if (var_data->hist_data == hist_data)
1605 found = find_var_ref(var_data->hist_data, hist_data, var_idx);
1614 * check_var_refs - Check if there is a reference to any of trigger's variables
1615 * @hist_data: The hist trigger
1617 * A trigger can define one or more variables. If any one of them is
1618 * currently referenced by any other trigger, this function will
1621 * Typically used to determine whether or not a trigger can be removed
1622 * - if there are any references to a trigger's variables, it cannot.
1624 * Return: True if there is a reference to any of trigger's variables
1626 static bool check_var_refs(struct hist_trigger_data *hist_data)
1628 struct hist_field *field;
1632 for_each_hist_field(i, hist_data) {
1633 field = hist_data->fields[i];
1634 if (field && field->flags & HIST_FIELD_FL_VAR) {
1635 if (find_any_var_ref(hist_data, field->var.idx)) {
1645 static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
1647 struct trace_array *tr = hist_data->event_file->tr;
1648 struct hist_var_data *var_data, *found = NULL;
1650 list_for_each_entry(var_data, &tr->hist_vars, list) {
1651 if (var_data->hist_data == hist_data) {
1660 static bool field_has_hist_vars(struct hist_field *hist_field,
1671 if (hist_field->flags & HIST_FIELD_FL_VAR ||
1672 hist_field->flags & HIST_FIELD_FL_VAR_REF)
1675 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
1676 struct hist_field *operand;
1678 operand = hist_field->operands[i];
1679 if (field_has_hist_vars(operand, level + 1))
1686 static bool has_hist_vars(struct hist_trigger_data *hist_data)
1688 struct hist_field *hist_field;
1691 for_each_hist_field(i, hist_data) {
1692 hist_field = hist_data->fields[i];
1693 if (field_has_hist_vars(hist_field, 0))
1700 static int save_hist_vars(struct hist_trigger_data *hist_data)
1702 struct trace_array *tr = hist_data->event_file->tr;
1703 struct hist_var_data *var_data;
1705 var_data = find_hist_vars(hist_data);
1709 if (tracing_check_open_get_tr(tr))
1712 var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
1714 trace_array_put(tr);
1718 var_data->hist_data = hist_data;
1719 list_add(&var_data->list, &tr->hist_vars);
1724 static void remove_hist_vars(struct hist_trigger_data *hist_data)
1726 struct trace_array *tr = hist_data->event_file->tr;
1727 struct hist_var_data *var_data;
1729 var_data = find_hist_vars(hist_data);
1733 if (WARN_ON(check_var_refs(hist_data)))
1736 list_del(&var_data->list);
1740 trace_array_put(tr);
1743 static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
1744 const char *var_name)
1746 struct hist_field *hist_field, *found = NULL;
1749 for_each_hist_field(i, hist_data) {
1750 hist_field = hist_data->fields[i];
1751 if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
1752 strcmp(hist_field->var.name, var_name) == 0) {
1761 static struct hist_field *find_var(struct hist_trigger_data *hist_data,
1762 struct trace_event_file *file,
1763 const char *var_name)
1765 struct hist_trigger_data *test_data;
1766 struct event_trigger_data *test;
1767 struct hist_field *hist_field;
1769 hist_field = find_var_field(hist_data, var_name);
1773 list_for_each_entry_rcu(test, &file->triggers, list) {
1774 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1775 test_data = test->private_data;
1776 hist_field = find_var_field(test_data, var_name);
1785 static struct trace_event_file *find_var_file(struct trace_array *tr,
1790 struct hist_trigger_data *var_hist_data;
1791 struct hist_var_data *var_data;
1792 struct trace_event_file *file, *found = NULL;
1795 return find_event_file(tr, system, event_name);
1797 list_for_each_entry(var_data, &tr->hist_vars, list) {
1798 var_hist_data = var_data->hist_data;
1799 file = var_hist_data->event_file;
1803 if (find_var_field(var_hist_data, var_name)) {
1805 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
1816 static struct hist_field *find_file_var(struct trace_event_file *file,
1817 const char *var_name)
1819 struct hist_trigger_data *test_data;
1820 struct event_trigger_data *test;
1821 struct hist_field *hist_field;
1823 list_for_each_entry_rcu(test, &file->triggers, list) {
1824 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1825 test_data = test->private_data;
1826 hist_field = find_var_field(test_data, var_name);
1835 static struct hist_field *
1836 find_match_var(struct hist_trigger_data *hist_data, char *var_name)
1838 struct trace_array *tr = hist_data->event_file->tr;
1839 struct hist_field *hist_field, *found = NULL;
1840 struct trace_event_file *file;
1843 for (i = 0; i < hist_data->n_actions; i++) {
1844 struct action_data *data = hist_data->actions[i];
1846 if (data->handler == HANDLER_ONMATCH) {
1847 char *system = data->match_data.event_system;
1848 char *event_name = data->match_data.event;
1850 file = find_var_file(tr, system, event_name, var_name);
1853 hist_field = find_file_var(file, var_name);
1856 hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
1858 return ERR_PTR(-EINVAL);
1868 static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
1873 struct trace_array *tr = hist_data->event_file->tr;
1874 struct hist_field *hist_field = NULL;
1875 struct trace_event_file *file;
1877 if (!system || !event_name) {
1878 hist_field = find_match_var(hist_data, var_name);
1879 if (IS_ERR(hist_field))
1885 file = find_var_file(tr, system, event_name, var_name);
1889 hist_field = find_file_var(file, var_name);
1894 static u64 hist_field_var_ref(struct hist_field *hist_field,
1895 struct tracing_map_elt *elt,
1896 struct ring_buffer_event *rbe,
1899 struct hist_elt_data *elt_data;
1902 if (WARN_ON_ONCE(!elt))
1905 elt_data = elt->private_data;
1906 var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
1911 static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
1912 u64 *var_ref_vals, bool self)
1914 struct hist_trigger_data *var_data;
1915 struct tracing_map_elt *var_elt;
1916 struct hist_field *hist_field;
1917 unsigned int i, var_idx;
1918 bool resolved = true;
1921 for (i = 0; i < hist_data->n_var_refs; i++) {
1922 hist_field = hist_data->var_refs[i];
1923 var_idx = hist_field->var.idx;
1924 var_data = hist_field->var.hist_data;
1926 if (var_data == NULL) {
1931 if ((self && var_data != hist_data) ||
1932 (!self && var_data == hist_data))
1935 var_elt = tracing_map_lookup(var_data->map, key);
1941 if (!tracing_map_var_set(var_elt, var_idx)) {
1946 if (self || !hist_field->read_once)
1947 var_val = tracing_map_read_var(var_elt, var_idx);
1949 var_val = tracing_map_read_var_once(var_elt, var_idx);
1951 var_ref_vals[i] = var_val;
1957 static const char *hist_field_name(struct hist_field *field,
1960 const char *field_name = "";
1966 field_name = field->field->name;
1967 else if (field->flags & HIST_FIELD_FL_LOG2 ||
1968 field->flags & HIST_FIELD_FL_ALIAS)
1969 field_name = hist_field_name(field->operands[0], ++level);
1970 else if (field->flags & HIST_FIELD_FL_CPU)
1972 else if (field->flags & HIST_FIELD_FL_EXPR ||
1973 field->flags & HIST_FIELD_FL_VAR_REF) {
1974 if (field->system) {
1975 static char full_name[MAX_FILTER_STR_VAL];
1977 strcat(full_name, field->system);
1978 strcat(full_name, ".");
1979 strcat(full_name, field->event_name);
1980 strcat(full_name, ".");
1981 strcat(full_name, field->name);
1982 field_name = full_name;
1984 field_name = field->name;
1985 } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
1986 field_name = "common_timestamp";
1988 if (field_name == NULL)
1994 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
1996 hist_field_fn_t fn = NULL;
1998 switch (field_size) {
2000 if (field_is_signed)
2001 fn = hist_field_s64;
2003 fn = hist_field_u64;
2006 if (field_is_signed)
2007 fn = hist_field_s32;
2009 fn = hist_field_u32;
2012 if (field_is_signed)
2013 fn = hist_field_s16;
2015 fn = hist_field_u16;
2018 if (field_is_signed)
2028 static int parse_map_size(char *str)
2030 unsigned long size, map_bits;
2039 ret = kstrtoul(str, 0, &size);
2043 map_bits = ilog2(roundup_pow_of_two(size));
2044 if (map_bits < TRACING_MAP_BITS_MIN ||
2045 map_bits > TRACING_MAP_BITS_MAX)
2053 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
2060 for (i = 0; i < attrs->n_assignments; i++)
2061 kfree(attrs->assignment_str[i]);
2063 for (i = 0; i < attrs->n_actions; i++)
2064 kfree(attrs->action_str[i]);
2067 kfree(attrs->sort_key_str);
2068 kfree(attrs->keys_str);
2069 kfree(attrs->vals_str);
2070 kfree(attrs->clock);
2074 static int parse_action(char *str, struct hist_trigger_attrs *attrs)
2078 if (attrs->n_actions >= HIST_ACTIONS_MAX)
2081 if ((str_has_prefix(str, "onmatch(")) ||
2082 (str_has_prefix(str, "onmax(")) ||
2083 (str_has_prefix(str, "onchange("))) {
2084 attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
2085 if (!attrs->action_str[attrs->n_actions]) {
2095 static int parse_assignment(struct trace_array *tr,
2096 char *str, struct hist_trigger_attrs *attrs)
2100 if ((str_has_prefix(str, "key=")) ||
2101 (str_has_prefix(str, "keys="))) {
2102 attrs->keys_str = kstrdup(str, GFP_KERNEL);
2103 if (!attrs->keys_str) {
2107 } else if ((str_has_prefix(str, "val=")) ||
2108 (str_has_prefix(str, "vals=")) ||
2109 (str_has_prefix(str, "values="))) {
2110 attrs->vals_str = kstrdup(str, GFP_KERNEL);
2111 if (!attrs->vals_str) {
2115 } else if (str_has_prefix(str, "sort=")) {
2116 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
2117 if (!attrs->sort_key_str) {
2121 } else if (str_has_prefix(str, "name=")) {
2122 attrs->name = kstrdup(str, GFP_KERNEL);
2127 } else if (str_has_prefix(str, "clock=")) {
2134 str = strstrip(str);
2135 attrs->clock = kstrdup(str, GFP_KERNEL);
2136 if (!attrs->clock) {
2140 } else if (str_has_prefix(str, "size=")) {
2141 int map_bits = parse_map_size(str);
2147 attrs->map_bits = map_bits;
2151 if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
2152 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
2157 assignment = kstrdup(str, GFP_KERNEL);
2163 attrs->assignment_str[attrs->n_assignments++] = assignment;
2169 static struct hist_trigger_attrs *
2170 parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
2172 struct hist_trigger_attrs *attrs;
2175 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
2177 return ERR_PTR(-ENOMEM);
2179 while (trigger_str) {
2180 char *str = strsep(&trigger_str, ":");
2182 if (strchr(str, '=')) {
2183 ret = parse_assignment(tr, str, attrs);
2186 } else if (strcmp(str, "pause") == 0)
2187 attrs->pause = true;
2188 else if ((strcmp(str, "cont") == 0) ||
2189 (strcmp(str, "continue") == 0))
2191 else if (strcmp(str, "clear") == 0)
2192 attrs->clear = true;
2194 ret = parse_action(str, attrs);
2200 if (!attrs->keys_str) {
2205 if (!attrs->clock) {
2206 attrs->clock = kstrdup("global", GFP_KERNEL);
2207 if (!attrs->clock) {
2215 destroy_hist_trigger_attrs(attrs);
2217 return ERR_PTR(ret);
2220 static inline void save_comm(char *comm, struct task_struct *task)
2223 strcpy(comm, "<idle>");
2227 if (WARN_ON_ONCE(task->pid < 0)) {
2228 strcpy(comm, "<XXX>");
2232 strncpy(comm, task->comm, TASK_COMM_LEN);
2235 static void hist_elt_data_free(struct hist_elt_data *elt_data)
2239 for (i = 0; i < SYNTH_FIELDS_MAX; i++)
2240 kfree(elt_data->field_var_str[i]);
2242 kfree(elt_data->comm);
2246 static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
2248 struct hist_elt_data *elt_data = elt->private_data;
2250 hist_elt_data_free(elt_data);
2253 static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
2255 struct hist_trigger_data *hist_data = elt->map->private_data;
2256 unsigned int size = TASK_COMM_LEN;
2257 struct hist_elt_data *elt_data;
2258 struct hist_field *key_field;
2259 unsigned int i, n_str;
2261 elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
2265 for_each_hist_key_field(i, hist_data) {
2266 key_field = hist_data->fields[i];
2268 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
2269 elt_data->comm = kzalloc(size, GFP_KERNEL);
2270 if (!elt_data->comm) {
2278 n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
2280 size = STR_VAR_LEN_MAX;
2282 for (i = 0; i < n_str; i++) {
2283 elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
2284 if (!elt_data->field_var_str[i]) {
2285 hist_elt_data_free(elt_data);
2290 elt->private_data = elt_data;
2295 static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
2297 struct hist_elt_data *elt_data = elt->private_data;
2300 save_comm(elt_data->comm, current);
2303 static const struct tracing_map_ops hist_trigger_elt_data_ops = {
2304 .elt_alloc = hist_trigger_elt_data_alloc,
2305 .elt_free = hist_trigger_elt_data_free,
2306 .elt_init = hist_trigger_elt_data_init,
2309 static const char *get_hist_field_flags(struct hist_field *hist_field)
2311 const char *flags_str = NULL;
2313 if (hist_field->flags & HIST_FIELD_FL_HEX)
2315 else if (hist_field->flags & HIST_FIELD_FL_SYM)
2317 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
2318 flags_str = "sym-offset";
2319 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
2320 flags_str = "execname";
2321 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
2322 flags_str = "syscall";
2323 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
2325 else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2326 flags_str = "usecs";
2331 static void expr_field_str(struct hist_field *field, char *expr)
2333 if (field->flags & HIST_FIELD_FL_VAR_REF)
2336 strcat(expr, hist_field_name(field, 0));
2338 if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
2339 const char *flags_str = get_hist_field_flags(field);
2343 strcat(expr, flags_str);
2348 static char *expr_str(struct hist_field *field, unsigned int level)
2355 expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
2359 if (!field->operands[0]) {
2360 expr_field_str(field, expr);
2364 if (field->operator == FIELD_OP_UNARY_MINUS) {
2368 subexpr = expr_str(field->operands[0], ++level);
2373 strcat(expr, subexpr);
2381 expr_field_str(field->operands[0], expr);
2383 switch (field->operator) {
2384 case FIELD_OP_MINUS:
2395 expr_field_str(field->operands[1], expr);
2400 static int contains_operator(char *str)
2402 enum field_op_id field_op = FIELD_OP_NONE;
2405 op = strpbrk(str, "+-");
2407 return FIELD_OP_NONE;
2412 field_op = FIELD_OP_UNARY_MINUS;
2414 field_op = FIELD_OP_MINUS;
2417 field_op = FIELD_OP_PLUS;
2426 static void __destroy_hist_field(struct hist_field *hist_field)
2428 kfree(hist_field->var.name);
2429 kfree(hist_field->name);
2430 kfree(hist_field->type);
2435 static void destroy_hist_field(struct hist_field *hist_field,
2446 if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
2447 return; /* var refs will be destroyed separately */
2449 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
2450 destroy_hist_field(hist_field->operands[i], level + 1);
2452 __destroy_hist_field(hist_field);
2455 static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
2456 struct ftrace_event_field *field,
2457 unsigned long flags,
2460 struct hist_field *hist_field;
2462 if (field && is_function_field(field))
2465 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
2469 hist_field->hist_data = hist_data;
2471 if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
2472 goto out; /* caller will populate */
2474 if (flags & HIST_FIELD_FL_VAR_REF) {
2475 hist_field->fn = hist_field_var_ref;
2479 if (flags & HIST_FIELD_FL_HITCOUNT) {
2480 hist_field->fn = hist_field_counter;
2481 hist_field->size = sizeof(u64);
2482 hist_field->type = kstrdup("u64", GFP_KERNEL);
2483 if (!hist_field->type)
2488 if (flags & HIST_FIELD_FL_STACKTRACE) {
2489 hist_field->fn = hist_field_none;
2493 if (flags & HIST_FIELD_FL_LOG2) {
2494 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
2495 hist_field->fn = hist_field_log2;
2496 hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
2497 hist_field->size = hist_field->operands[0]->size;
2498 hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
2499 if (!hist_field->type)
2504 if (flags & HIST_FIELD_FL_TIMESTAMP) {
2505 hist_field->fn = hist_field_timestamp;
2506 hist_field->size = sizeof(u64);
2507 hist_field->type = kstrdup("u64", GFP_KERNEL);
2508 if (!hist_field->type)
2513 if (flags & HIST_FIELD_FL_CPU) {
2514 hist_field->fn = hist_field_cpu;
2515 hist_field->size = sizeof(int);
2516 hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
2517 if (!hist_field->type)
2522 if (WARN_ON_ONCE(!field))
2525 if (is_string_field(field)) {
2526 flags |= HIST_FIELD_FL_STRING;
2528 hist_field->size = MAX_FILTER_STR_VAL;
2529 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2530 if (!hist_field->type)
2533 if (field->filter_type == FILTER_STATIC_STRING)
2534 hist_field->fn = hist_field_string;
2535 else if (field->filter_type == FILTER_DYN_STRING)
2536 hist_field->fn = hist_field_dynstring;
2538 hist_field->fn = hist_field_pstring;
2540 hist_field->size = field->size;
2541 hist_field->is_signed = field->is_signed;
2542 hist_field->type = kstrdup(field->type, GFP_KERNEL);
2543 if (!hist_field->type)
2546 hist_field->fn = select_value_fn(field->size,
2548 if (!hist_field->fn) {
2549 destroy_hist_field(hist_field, 0);
2554 hist_field->field = field;
2555 hist_field->flags = flags;
2558 hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
2559 if (!hist_field->var.name)
2565 destroy_hist_field(hist_field, 0);
2569 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
2573 for (i = 0; i < HIST_FIELDS_MAX; i++) {
2574 if (hist_data->fields[i]) {
2575 destroy_hist_field(hist_data->fields[i], 0);
2576 hist_data->fields[i] = NULL;
2580 for (i = 0; i < hist_data->n_var_refs; i++) {
2581 WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
2582 __destroy_hist_field(hist_data->var_refs[i]);
2583 hist_data->var_refs[i] = NULL;
2587 static int init_var_ref(struct hist_field *ref_field,
2588 struct hist_field *var_field,
2589 char *system, char *event_name)
2593 ref_field->var.idx = var_field->var.idx;
2594 ref_field->var.hist_data = var_field->hist_data;
2595 ref_field->size = var_field->size;
2596 ref_field->is_signed = var_field->is_signed;
2597 ref_field->flags |= var_field->flags &
2598 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2601 ref_field->system = kstrdup(system, GFP_KERNEL);
2602 if (!ref_field->system)
2607 ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
2608 if (!ref_field->event_name) {
2614 if (var_field->var.name) {
2615 ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
2616 if (!ref_field->name) {
2620 } else if (var_field->name) {
2621 ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
2622 if (!ref_field->name) {
2628 ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
2629 if (!ref_field->type) {
2636 kfree(ref_field->system);
2637 kfree(ref_field->event_name);
2638 kfree(ref_field->name);
2644 * create_var_ref - Create a variable reference and attach it to trigger
2645 * @hist_data: The trigger that will be referencing the variable
2646 * @var_field: The VAR field to create a reference to
2647 * @system: The optional system string
2648 * @event_name: The optional event_name string
2650 * Given a variable hist_field, create a VAR_REF hist_field that
2651 * represents a reference to it.
2653 * This function also adds the reference to the trigger that
2654 * now references the variable.
2656 * Return: The VAR_REF field if successful, NULL if not
2658 static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
2659 struct hist_field *var_field,
2660 char *system, char *event_name)
2662 unsigned long flags = HIST_FIELD_FL_VAR_REF;
2663 struct hist_field *ref_field;
2665 ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
2667 if (init_var_ref(ref_field, var_field, system, event_name)) {
2668 destroy_hist_field(ref_field, 0);
2672 hist_data->var_refs[hist_data->n_var_refs] = ref_field;
2673 ref_field->var_ref_idx = hist_data->n_var_refs++;
2679 static bool is_var_ref(char *var_name)
2681 if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
2687 static char *field_name_from_var(struct hist_trigger_data *hist_data,
2693 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
2694 name = hist_data->attrs->var_defs.name[i];
2696 if (strcmp(var_name, name) == 0) {
2697 field = hist_data->attrs->var_defs.expr[i];
2698 if (contains_operator(field) || is_var_ref(field))
2707 static char *local_field_var_ref(struct hist_trigger_data *hist_data,
2708 char *system, char *event_name,
2711 struct trace_event_call *call;
2713 if (system && event_name) {
2714 call = hist_data->event_file->event_call;
2716 if (strcmp(system, call->class->system) != 0)
2719 if (strcmp(event_name, trace_event_name(call)) != 0)
2723 if (!!system != !!event_name)
2726 if (!is_var_ref(var_name))
2731 return field_name_from_var(hist_data, var_name);
2734 static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
2735 char *system, char *event_name,
2738 struct hist_field *var_field = NULL, *ref_field = NULL;
2739 struct trace_array *tr = hist_data->event_file->tr;
2741 if (!is_var_ref(var_name))
2746 var_field = find_event_var(hist_data, system, event_name, var_name);
2748 ref_field = create_var_ref(hist_data, var_field,
2749 system, event_name);
2752 hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
2757 static struct ftrace_event_field *
2758 parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
2759 char *field_str, unsigned long *flags)
2761 struct ftrace_event_field *field = NULL;
2762 char *field_name, *modifier, *str;
2763 struct trace_array *tr = file->tr;
2765 modifier = str = kstrdup(field_str, GFP_KERNEL);
2767 return ERR_PTR(-ENOMEM);
2769 field_name = strsep(&modifier, ".");
2771 if (strcmp(modifier, "hex") == 0)
2772 *flags |= HIST_FIELD_FL_HEX;
2773 else if (strcmp(modifier, "sym") == 0)
2774 *flags |= HIST_FIELD_FL_SYM;
2775 else if (strcmp(modifier, "sym-offset") == 0)
2776 *flags |= HIST_FIELD_FL_SYM_OFFSET;
2777 else if ((strcmp(modifier, "execname") == 0) &&
2778 (strcmp(field_name, "common_pid") == 0))
2779 *flags |= HIST_FIELD_FL_EXECNAME;
2780 else if (strcmp(modifier, "syscall") == 0)
2781 *flags |= HIST_FIELD_FL_SYSCALL;
2782 else if (strcmp(modifier, "log2") == 0)
2783 *flags |= HIST_FIELD_FL_LOG2;
2784 else if (strcmp(modifier, "usecs") == 0)
2785 *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
2787 hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
2788 field = ERR_PTR(-EINVAL);
2793 if (strcmp(field_name, "common_timestamp") == 0) {
2794 *flags |= HIST_FIELD_FL_TIMESTAMP;
2795 hist_data->enable_timestamps = true;
2796 if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
2797 hist_data->attrs->ts_in_usecs = true;
2798 } else if (strcmp(field_name, "cpu") == 0)
2799 *flags |= HIST_FIELD_FL_CPU;
2801 field = trace_find_event_field(file->event_call, field_name);
2802 if (!field || !field->size) {
2803 hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
2804 field = ERR_PTR(-EINVAL);
2814 static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
2815 struct hist_field *var_ref,
2818 struct hist_field *alias = NULL;
2819 unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
2821 alias = create_hist_field(hist_data, NULL, flags, var_name);
2825 alias->fn = var_ref->fn;
2826 alias->operands[0] = var_ref;
2828 if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
2829 destroy_hist_field(alias, 0);
2833 alias->var_ref_idx = var_ref->var_ref_idx;
2838 static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
2839 struct trace_event_file *file, char *str,
2840 unsigned long *flags, char *var_name)
2842 char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
2843 struct ftrace_event_field *field = NULL;
2844 struct hist_field *hist_field = NULL;
2847 s = strchr(str, '.');
2849 s = strchr(++s, '.');
2851 ref_system = strsep(&str, ".");
2856 ref_event = strsep(&str, ".");
2865 s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
2867 hist_field = parse_var_ref(hist_data, ref_system,
2868 ref_event, ref_var);
2871 hist_field = create_alias(hist_data, hist_field, var_name);
2882 field = parse_field(hist_data, file, str, flags);
2883 if (IS_ERR(field)) {
2884 ret = PTR_ERR(field);
2888 hist_field = create_hist_field(hist_data, field, *flags, var_name);
2896 return ERR_PTR(ret);
2899 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
2900 struct trace_event_file *file,
2901 char *str, unsigned long flags,
2902 char *var_name, unsigned int level);
2904 static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
2905 struct trace_event_file *file,
2906 char *str, unsigned long flags,
2907 char *var_name, unsigned int level)
2909 struct hist_field *operand1, *expr = NULL;
2910 unsigned long operand_flags;
2914 /* we support only -(xxx) i.e. explicit parens required */
2917 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
2922 str++; /* skip leading '-' */
2924 s = strchr(str, '(');
2932 s = strrchr(str, ')');
2936 ret = -EINVAL; /* no closing ')' */
2940 flags |= HIST_FIELD_FL_EXPR;
2941 expr = create_hist_field(hist_data, NULL, flags, var_name);
2948 operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
2949 if (IS_ERR(operand1)) {
2950 ret = PTR_ERR(operand1);
2954 expr->flags |= operand1->flags &
2955 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
2956 expr->fn = hist_field_unary_minus;
2957 expr->operands[0] = operand1;
2958 expr->operator = FIELD_OP_UNARY_MINUS;
2959 expr->name = expr_str(expr, 0);
2960 expr->type = kstrdup(operand1->type, GFP_KERNEL);
2968 destroy_hist_field(expr, 0);
2969 return ERR_PTR(ret);
2972 static int check_expr_operands(struct trace_array *tr,
2973 struct hist_field *operand1,
2974 struct hist_field *operand2)
2976 unsigned long operand1_flags = operand1->flags;
2977 unsigned long operand2_flags = operand2->flags;
2979 if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
2980 (operand1_flags & HIST_FIELD_FL_ALIAS)) {
2981 struct hist_field *var;
2983 var = find_var_field(operand1->var.hist_data, operand1->name);
2986 operand1_flags = var->flags;
2989 if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
2990 (operand2_flags & HIST_FIELD_FL_ALIAS)) {
2991 struct hist_field *var;
2993 var = find_var_field(operand2->var.hist_data, operand2->name);
2996 operand2_flags = var->flags;
2999 if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
3000 (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
3001 hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
3008 static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
3009 struct trace_event_file *file,
3010 char *str, unsigned long flags,
3011 char *var_name, unsigned int level)
3013 struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
3014 unsigned long operand_flags;
3015 int field_op, ret = -EINVAL;
3016 char *sep, *operand1_str;
3019 hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
3020 return ERR_PTR(-EINVAL);
3023 field_op = contains_operator(str);
3025 if (field_op == FIELD_OP_NONE)
3026 return parse_atom(hist_data, file, str, &flags, var_name);
3028 if (field_op == FIELD_OP_UNARY_MINUS)
3029 return parse_unary(hist_data, file, str, flags, var_name, ++level);
3032 case FIELD_OP_MINUS:
3042 operand1_str = strsep(&str, sep);
3043 if (!operand1_str || !str)
3047 operand1 = parse_atom(hist_data, file, operand1_str,
3048 &operand_flags, NULL);
3049 if (IS_ERR(operand1)) {
3050 ret = PTR_ERR(operand1);
3055 /* rest of string could be another expression e.g. b+c in a+b+c */
3057 operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
3058 if (IS_ERR(operand2)) {
3059 ret = PTR_ERR(operand2);
3064 ret = check_expr_operands(file->tr, operand1, operand2);
3068 flags |= HIST_FIELD_FL_EXPR;
3070 flags |= operand1->flags &
3071 (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
3073 expr = create_hist_field(hist_data, NULL, flags, var_name);
3079 operand1->read_once = true;
3080 operand2->read_once = true;
3082 expr->operands[0] = operand1;
3083 expr->operands[1] = operand2;
3084 expr->operator = field_op;
3085 expr->name = expr_str(expr, 0);
3086 expr->type = kstrdup(operand1->type, GFP_KERNEL);
3093 case FIELD_OP_MINUS:
3094 expr->fn = hist_field_minus;
3097 expr->fn = hist_field_plus;
3106 destroy_hist_field(operand1, 0);
3107 destroy_hist_field(operand2, 0);
3108 destroy_hist_field(expr, 0);
3110 return ERR_PTR(ret);
3113 static char *find_trigger_filter(struct hist_trigger_data *hist_data,
3114 struct trace_event_file *file)
3116 struct event_trigger_data *test;
3118 list_for_each_entry_rcu(test, &file->triggers, list) {
3119 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3120 if (test->private_data == hist_data)
3121 return test->filter_str;
3128 static struct event_command trigger_hist_cmd;
3129 static int event_hist_trigger_func(struct event_command *cmd_ops,
3130 struct trace_event_file *file,
3131 char *glob, char *cmd, char *param);
3133 static bool compatible_keys(struct hist_trigger_data *target_hist_data,
3134 struct hist_trigger_data *hist_data,
3135 unsigned int n_keys)
3137 struct hist_field *target_hist_field, *hist_field;
3138 unsigned int n, i, j;
3140 if (hist_data->n_fields - hist_data->n_vals != n_keys)
3143 i = hist_data->n_vals;
3144 j = target_hist_data->n_vals;
3146 for (n = 0; n < n_keys; n++) {
3147 hist_field = hist_data->fields[i + n];
3148 target_hist_field = target_hist_data->fields[j + n];
3150 if (strcmp(hist_field->type, target_hist_field->type) != 0)
3152 if (hist_field->size != target_hist_field->size)
3154 if (hist_field->is_signed != target_hist_field->is_signed)
3161 static struct hist_trigger_data *
3162 find_compatible_hist(struct hist_trigger_data *target_hist_data,
3163 struct trace_event_file *file)
3165 struct hist_trigger_data *hist_data;
3166 struct event_trigger_data *test;
3167 unsigned int n_keys;
3169 n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
3171 list_for_each_entry_rcu(test, &file->triggers, list) {
3172 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
3173 hist_data = test->private_data;
3175 if (compatible_keys(target_hist_data, hist_data, n_keys))
3183 static struct trace_event_file *event_file(struct trace_array *tr,
3184 char *system, char *event_name)
3186 struct trace_event_file *file;
3188 file = __find_event_file(tr, system, event_name);
3190 return ERR_PTR(-EINVAL);
3195 static struct hist_field *
3196 find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
3197 char *system, char *event_name, char *field_name)
3199 struct hist_field *event_var;
3200 char *synthetic_name;
3202 synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3203 if (!synthetic_name)
3204 return ERR_PTR(-ENOMEM);
3206 strcpy(synthetic_name, "synthetic_");
3207 strcat(synthetic_name, field_name);
3209 event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
3211 kfree(synthetic_name);
3217 * create_field_var_hist - Automatically create a histogram and var for a field
3218 * @target_hist_data: The target hist trigger
3219 * @subsys_name: Optional subsystem name
3220 * @event_name: Optional event name
3221 * @field_name: The name of the field (and the resulting variable)
3223 * Hist trigger actions fetch data from variables, not directly from
3224 * events. However, for convenience, users are allowed to directly
3225 * specify an event field in an action, which will be automatically
3226 * converted into a variable on their behalf.
3228 * If a user specifies a field on an event that isn't the event the
3229 * histogram currently being defined (the target event histogram), the
3230 * only way that can be accomplished is if a new hist trigger is
3231 * created and the field variable defined on that.
3233 * This function creates a new histogram compatible with the target
3234 * event (meaning a histogram with the same key as the target
3235 * histogram), and creates a variable for the specified field, but
3236 * with 'synthetic_' prepended to the variable name in order to avoid
3237 * collision with normal field variables.
3239 * Return: The variable created for the field.
3241 static struct hist_field *
3242 create_field_var_hist(struct hist_trigger_data *target_hist_data,
3243 char *subsys_name, char *event_name, char *field_name)
3245 struct trace_array *tr = target_hist_data->event_file->tr;
3246 struct hist_field *event_var = ERR_PTR(-EINVAL);
3247 struct hist_trigger_data *hist_data;
3248 unsigned int i, n, first = true;
3249 struct field_var_hist *var_hist;
3250 struct trace_event_file *file;
3251 struct hist_field *key_field;
3256 if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
3257 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
3258 return ERR_PTR(-EINVAL);
3261 file = event_file(tr, subsys_name, event_name);
3264 hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
3265 ret = PTR_ERR(file);
3266 return ERR_PTR(ret);
3270 * Look for a histogram compatible with target. We'll use the
3271 * found histogram specification to create a new matching
3272 * histogram with our variable on it. target_hist_data is not
3273 * yet a registered histogram so we can't use that.
3275 hist_data = find_compatible_hist(target_hist_data, file);
3277 hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
3278 return ERR_PTR(-EINVAL);
3281 /* See if a synthetic field variable has already been created */
3282 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3283 event_name, field_name);
3284 if (!IS_ERR_OR_NULL(event_var))
3287 var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
3289 return ERR_PTR(-ENOMEM);
3291 cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
3294 return ERR_PTR(-ENOMEM);
3297 /* Use the same keys as the compatible histogram */
3298 strcat(cmd, "keys=");
3300 for_each_hist_key_field(i, hist_data) {
3301 key_field = hist_data->fields[i];
3304 strcat(cmd, key_field->field->name);
3308 /* Create the synthetic field variable specification */
3309 strcat(cmd, ":synthetic_");
3310 strcat(cmd, field_name);
3312 strcat(cmd, field_name);
3314 /* Use the same filter as the compatible histogram */
3315 saved_filter = find_trigger_filter(hist_data, file);
3317 strcat(cmd, " if ");
3318 strcat(cmd, saved_filter);
3321 var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
3322 if (!var_hist->cmd) {
3325 return ERR_PTR(-ENOMEM);
3328 /* Save the compatible histogram information */
3329 var_hist->hist_data = hist_data;
3331 /* Create the new histogram with our variable */
3332 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
3336 kfree(var_hist->cmd);
3338 hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
3339 return ERR_PTR(ret);
3344 /* If we can't find the variable, something went wrong */
3345 event_var = find_synthetic_field_var(target_hist_data, subsys_name,
3346 event_name, field_name);
3347 if (IS_ERR_OR_NULL(event_var)) {
3348 kfree(var_hist->cmd);
3350 hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
3351 return ERR_PTR(-EINVAL);
3354 n = target_hist_data->n_field_var_hists;
3355 target_hist_data->field_var_hists[n] = var_hist;
3356 target_hist_data->n_field_var_hists++;
3361 static struct hist_field *
3362 find_target_event_var(struct hist_trigger_data *hist_data,
3363 char *subsys_name, char *event_name, char *var_name)
3365 struct trace_event_file *file = hist_data->event_file;
3366 struct hist_field *hist_field = NULL;
3369 struct trace_event_call *call;
3374 call = file->event_call;
3376 if (strcmp(subsys_name, call->class->system) != 0)
3379 if (strcmp(event_name, trace_event_name(call)) != 0)
3383 hist_field = find_var_field(hist_data, var_name);
3388 static inline void __update_field_vars(struct tracing_map_elt *elt,
3389 struct ring_buffer_event *rbe,
3391 struct field_var **field_vars,
3392 unsigned int n_field_vars,
3393 unsigned int field_var_str_start)
3395 struct hist_elt_data *elt_data = elt->private_data;
3396 unsigned int i, j, var_idx;
3399 for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
3400 struct field_var *field_var = field_vars[i];
3401 struct hist_field *var = field_var->var;
3402 struct hist_field *val = field_var->val;
3404 var_val = val->fn(val, elt, rbe, rec);
3405 var_idx = var->var.idx;
3407 if (val->flags & HIST_FIELD_FL_STRING) {
3408 char *str = elt_data->field_var_str[j++];
3409 char *val_str = (char *)(uintptr_t)var_val;
3411 strscpy(str, val_str, STR_VAR_LEN_MAX);
3412 var_val = (u64)(uintptr_t)str;
3414 tracing_map_set_var(elt, var_idx, var_val);
3418 static void update_field_vars(struct hist_trigger_data *hist_data,
3419 struct tracing_map_elt *elt,
3420 struct ring_buffer_event *rbe,
3423 __update_field_vars(elt, rbe, rec, hist_data->field_vars,
3424 hist_data->n_field_vars, 0);
3427 static void save_track_data_vars(struct hist_trigger_data *hist_data,
3428 struct tracing_map_elt *elt, void *rec,
3429 struct ring_buffer_event *rbe, void *key,
3430 struct action_data *data, u64 *var_ref_vals)
3432 __update_field_vars(elt, rbe, rec, hist_data->save_vars,
3433 hist_data->n_save_vars, hist_data->n_field_var_str);
3436 static struct hist_field *create_var(struct hist_trigger_data *hist_data,
3437 struct trace_event_file *file,
3438 char *name, int size, const char *type)
3440 struct hist_field *var;
3443 if (find_var(hist_data, file, name) && !hist_data->remove) {
3444 var = ERR_PTR(-EINVAL);
3448 var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
3450 var = ERR_PTR(-ENOMEM);
3454 idx = tracing_map_add_var(hist_data->map);
3457 var = ERR_PTR(-EINVAL);
3461 var->flags = HIST_FIELD_FL_VAR;
3463 var->var.hist_data = var->hist_data = hist_data;
3465 var->var.name = kstrdup(name, GFP_KERNEL);
3466 var->type = kstrdup(type, GFP_KERNEL);
3467 if (!var->var.name || !var->type) {
3468 kfree(var->var.name);
3471 var = ERR_PTR(-ENOMEM);
3477 static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
3478 struct trace_event_file *file,
3481 struct hist_field *val = NULL, *var = NULL;
3482 unsigned long flags = HIST_FIELD_FL_VAR;
3483 struct trace_array *tr = file->tr;
3484 struct field_var *field_var;
3487 if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
3488 hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
3493 val = parse_atom(hist_data, file, field_name, &flags, NULL);
3495 hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
3500 var = create_var(hist_data, file, field_name, val->size, val->type);
3502 hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
3508 field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
3516 field_var->var = var;
3517 field_var->val = val;
3521 field_var = ERR_PTR(ret);
3526 * create_target_field_var - Automatically create a variable for a field
3527 * @target_hist_data: The target hist trigger
3528 * @subsys_name: Optional subsystem name
3529 * @event_name: Optional event name
3530 * @var_name: The name of the field (and the resulting variable)
3532 * Hist trigger actions fetch data from variables, not directly from
3533 * events. However, for convenience, users are allowed to directly
3534 * specify an event field in an action, which will be automatically
3535 * converted into a variable on their behalf.
3537 * This function creates a field variable with the name var_name on
3538 * the hist trigger currently being defined on the target event. If
3539 * subsys_name and event_name are specified, this function simply
3540 * verifies that they do in fact match the target event subsystem and
3543 * Return: The variable created for the field.
3545 static struct field_var *
3546 create_target_field_var(struct hist_trigger_data *target_hist_data,
3547 char *subsys_name, char *event_name, char *var_name)
3549 struct trace_event_file *file = target_hist_data->event_file;
3552 struct trace_event_call *call;
3557 call = file->event_call;
3559 if (strcmp(subsys_name, call->class->system) != 0)
3562 if (strcmp(event_name, trace_event_name(call)) != 0)
3566 return create_field_var(target_hist_data, file, var_name);
3569 static bool check_track_val_max(u64 track_val, u64 var_val)
3571 if (var_val <= track_val)
3577 static bool check_track_val_changed(u64 track_val, u64 var_val)
3579 if (var_val == track_val)
3585 static u64 get_track_val(struct hist_trigger_data *hist_data,
3586 struct tracing_map_elt *elt,
3587 struct action_data *data)
3589 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3592 track_val = tracing_map_read_var(elt, track_var_idx);
3597 static void save_track_val(struct hist_trigger_data *hist_data,
3598 struct tracing_map_elt *elt,
3599 struct action_data *data, u64 var_val)
3601 unsigned int track_var_idx = data->track_data.track_var->var.idx;
3603 tracing_map_set_var(elt, track_var_idx, var_val);
3606 static void save_track_data(struct hist_trigger_data *hist_data,
3607 struct tracing_map_elt *elt, void *rec,
3608 struct ring_buffer_event *rbe, void *key,
3609 struct action_data *data, u64 *var_ref_vals)
3611 if (data->track_data.save_data)
3612 data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3615 static bool check_track_val(struct tracing_map_elt *elt,
3616 struct action_data *data,
3619 struct hist_trigger_data *hist_data;
3622 hist_data = data->track_data.track_var->hist_data;
3623 track_val = get_track_val(hist_data, elt, data);
3625 return data->track_data.check_val(track_val, var_val);
3628 #ifdef CONFIG_TRACER_SNAPSHOT
3629 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3631 /* called with tr->max_lock held */
3632 struct track_data *track_data = tr->cond_snapshot->cond_data;
3633 struct hist_elt_data *elt_data, *track_elt_data;
3634 struct snapshot_context *context = cond_data;
3635 struct action_data *action;
3641 action = track_data->action_data;
3643 track_val = get_track_val(track_data->hist_data, context->elt,
3644 track_data->action_data);
3646 if (!action->track_data.check_val(track_data->track_val, track_val))
3649 track_data->track_val = track_val;
3650 memcpy(track_data->key, context->key, track_data->key_len);
3652 elt_data = context->elt->private_data;
3653 track_elt_data = track_data->elt.private_data;
3655 strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
3657 track_data->updated = true;
3662 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3663 struct tracing_map_elt *elt, void *rec,
3664 struct ring_buffer_event *rbe, void *key,
3665 struct action_data *data,
3668 struct trace_event_file *file = hist_data->event_file;
3669 struct snapshot_context context;
3674 tracing_snapshot_cond(file->tr, &context);
3677 static void hist_trigger_print_key(struct seq_file *m,
3678 struct hist_trigger_data *hist_data,
3680 struct tracing_map_elt *elt);
3682 static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
3686 if (!hist_data->n_actions)
3689 for (i = 0; i < hist_data->n_actions; i++) {
3690 struct action_data *data = hist_data->actions[i];
3692 if (data->action == ACTION_SNAPSHOT)
3699 static void track_data_snapshot_print(struct seq_file *m,
3700 struct hist_trigger_data *hist_data)
3702 struct trace_event_file *file = hist_data->event_file;
3703 struct track_data *track_data;
3704 struct action_data *action;
3706 track_data = tracing_cond_snapshot_data(file->tr);
3710 if (!track_data->updated)
3713 action = snapshot_action(hist_data);
3717 seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
3718 seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
3719 action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
3720 action->track_data.var_str, track_data->track_val);
3722 seq_puts(m, "\ttriggered by event with key: ");
3723 hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
3727 static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
3731 static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
3732 struct tracing_map_elt *elt, void *rec,
3733 struct ring_buffer_event *rbe, void *key,
3734 struct action_data *data,
3735 u64 *var_ref_vals) {}
3736 static void track_data_snapshot_print(struct seq_file *m,
3737 struct hist_trigger_data *hist_data) {}
3738 #endif /* CONFIG_TRACER_SNAPSHOT */
3740 static void track_data_print(struct seq_file *m,
3741 struct hist_trigger_data *hist_data,
3742 struct tracing_map_elt *elt,
3743 struct action_data *data)
3745 u64 track_val = get_track_val(hist_data, elt, data);
3746 unsigned int i, save_var_idx;
3748 if (data->handler == HANDLER_ONMAX)
3749 seq_printf(m, "\n\tmax: %10llu", track_val);
3750 else if (data->handler == HANDLER_ONCHANGE)
3751 seq_printf(m, "\n\tchanged: %10llu", track_val);
3753 if (data->action == ACTION_SNAPSHOT)
3756 for (i = 0; i < hist_data->n_save_vars; i++) {
3757 struct hist_field *save_val = hist_data->save_vars[i]->val;
3758 struct hist_field *save_var = hist_data->save_vars[i]->var;
3761 save_var_idx = save_var->var.idx;
3763 val = tracing_map_read_var(elt, save_var_idx);
3765 if (save_val->flags & HIST_FIELD_FL_STRING) {
3766 seq_printf(m, " %s: %-32s", save_var->var.name,
3767 (char *)(uintptr_t)(val));
3769 seq_printf(m, " %s: %10llu", save_var->var.name, val);
3773 static void ontrack_action(struct hist_trigger_data *hist_data,
3774 struct tracing_map_elt *elt, void *rec,
3775 struct ring_buffer_event *rbe, void *key,
3776 struct action_data *data, u64 *var_ref_vals)
3778 u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
3780 if (check_track_val(elt, data, var_val)) {
3781 save_track_val(hist_data, elt, data, var_val);
3782 save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
3786 static void action_data_destroy(struct action_data *data)
3790 lockdep_assert_held(&event_mutex);
3792 kfree(data->action_name);
3794 for (i = 0; i < data->n_params; i++)
3795 kfree(data->params[i]);
3797 if (data->synth_event)
3798 data->synth_event->ref--;
3800 kfree(data->synth_event_name);
3805 static void track_data_destroy(struct hist_trigger_data *hist_data,
3806 struct action_data *data)
3808 struct trace_event_file *file = hist_data->event_file;
3810 destroy_hist_field(data->track_data.track_var, 0);
3812 if (data->action == ACTION_SNAPSHOT) {
3813 struct track_data *track_data;
3815 track_data = tracing_cond_snapshot_data(file->tr);
3816 if (track_data && track_data->hist_data == hist_data) {
3817 tracing_snapshot_cond_disable(file->tr);
3818 track_data_free(track_data);
3822 kfree(data->track_data.var_str);
3824 action_data_destroy(data);
3827 static int action_create(struct hist_trigger_data *hist_data,
3828 struct action_data *data);
3830 static int track_data_create(struct hist_trigger_data *hist_data,
3831 struct action_data *data)
3833 struct hist_field *var_field, *ref_field, *track_var = NULL;
3834 struct trace_event_file *file = hist_data->event_file;
3835 struct trace_array *tr = file->tr;
3836 char *track_data_var_str;
3839 track_data_var_str = data->track_data.var_str;
3840 if (track_data_var_str[0] != '$') {
3841 hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
3844 track_data_var_str++;
3846 var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
3848 hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
3852 ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
3856 data->track_data.var_ref = ref_field;
3858 if (data->handler == HANDLER_ONMAX)
3859 track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
3860 if (IS_ERR(track_var)) {
3861 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3862 ret = PTR_ERR(track_var);
3866 if (data->handler == HANDLER_ONCHANGE)
3867 track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
3868 if (IS_ERR(track_var)) {
3869 hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
3870 ret = PTR_ERR(track_var);
3873 data->track_data.track_var = track_var;
3875 ret = action_create(hist_data, data);
3880 static int parse_action_params(struct trace_array *tr, char *params,
3881 struct action_data *data)
3883 char *param, *saved_param;
3884 bool first_param = true;
3888 if (data->n_params >= SYNTH_FIELDS_MAX) {
3889 hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
3893 param = strsep(¶ms, ",");
3895 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
3900 param = strstrip(param);
3901 if (strlen(param) < 2) {
3902 hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
3907 saved_param = kstrdup(param, GFP_KERNEL);
3913 if (first_param && data->use_trace_keyword) {
3914 data->synth_event_name = saved_param;
3915 first_param = false;
3918 first_param = false;
3920 data->params[data->n_params++] = saved_param;
3926 static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
3927 enum handler_id handler)
3934 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3939 action_name = strsep(&str, "(");
3940 if (!action_name || !str) {
3941 hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
3946 if (str_has_prefix(action_name, "save")) {
3947 char *params = strsep(&str, ")");
3950 hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
3955 ret = parse_action_params(tr, params, data);
3959 if (handler == HANDLER_ONMAX)
3960 data->track_data.check_val = check_track_val_max;
3961 else if (handler == HANDLER_ONCHANGE)
3962 data->track_data.check_val = check_track_val_changed;
3964 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3969 data->track_data.save_data = save_track_data_vars;
3970 data->fn = ontrack_action;
3971 data->action = ACTION_SAVE;
3972 } else if (str_has_prefix(action_name, "snapshot")) {
3973 char *params = strsep(&str, ")");
3976 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
3981 if (handler == HANDLER_ONMAX)
3982 data->track_data.check_val = check_track_val_max;
3983 else if (handler == HANDLER_ONCHANGE)
3984 data->track_data.check_val = check_track_val_changed;
3986 hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
3991 data->track_data.save_data = save_track_data_snapshot;
3992 data->fn = ontrack_action;
3993 data->action = ACTION_SNAPSHOT;
3995 char *params = strsep(&str, ")");
3997 if (str_has_prefix(action_name, "trace"))
3998 data->use_trace_keyword = true;
4001 ret = parse_action_params(tr, params, data);
4006 if (handler == HANDLER_ONMAX)
4007 data->track_data.check_val = check_track_val_max;
4008 else if (handler == HANDLER_ONCHANGE)
4009 data->track_data.check_val = check_track_val_changed;
4011 if (handler != HANDLER_ONMATCH) {
4012 data->track_data.save_data = action_trace;
4013 data->fn = ontrack_action;
4015 data->fn = action_trace;
4017 data->action = ACTION_TRACE;
4020 data->action_name = kstrdup(action_name, GFP_KERNEL);
4021 if (!data->action_name) {
4026 data->handler = handler;
4031 static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
4032 char *str, enum handler_id handler)
4034 struct action_data *data;
4038 data = kzalloc(sizeof(*data), GFP_KERNEL);
4040 return ERR_PTR(-ENOMEM);
4042 var_str = strsep(&str, ")");
4043 if (!var_str || !str) {
4048 data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
4049 if (!data->track_data.var_str) {
4054 ret = action_parse(hist_data->event_file->tr, str, data, handler);
4060 track_data_destroy(hist_data, data);
4061 data = ERR_PTR(ret);
4065 static void onmatch_destroy(struct action_data *data)
4067 kfree(data->match_data.event);
4068 kfree(data->match_data.event_system);
4070 action_data_destroy(data);
4073 static void destroy_field_var(struct field_var *field_var)
4078 destroy_hist_field(field_var->var, 0);
4079 destroy_hist_field(field_var->val, 0);
4084 static void destroy_field_vars(struct hist_trigger_data *hist_data)
4088 for (i = 0; i < hist_data->n_field_vars; i++)
4089 destroy_field_var(hist_data->field_vars[i]);
4092 static void save_field_var(struct hist_trigger_data *hist_data,
4093 struct field_var *field_var)
4095 hist_data->field_vars[hist_data->n_field_vars++] = field_var;
4097 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4098 hist_data->n_field_var_str++;
4102 static int check_synth_field(struct synth_event *event,
4103 struct hist_field *hist_field,
4104 unsigned int field_pos)
4106 struct synth_field *field;
4108 if (field_pos >= event->n_fields)
4111 field = event->fields[field_pos];
4113 if (strcmp(field->type, hist_field->type) != 0) {
4114 if (field->size != hist_field->size ||
4115 field->is_signed != hist_field->is_signed)
4122 static struct hist_field *
4123 trace_action_find_var(struct hist_trigger_data *hist_data,
4124 struct action_data *data,
4125 char *system, char *event, char *var)
4127 struct trace_array *tr = hist_data->event_file->tr;
4128 struct hist_field *hist_field;
4130 var++; /* skip '$' */
4132 hist_field = find_target_event_var(hist_data, system, event, var);
4134 if (!system && data->handler == HANDLER_ONMATCH) {
4135 system = data->match_data.event_system;
4136 event = data->match_data.event;
4139 hist_field = find_event_var(hist_data, system, event, var);
4143 hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
4148 static struct hist_field *
4149 trace_action_create_field_var(struct hist_trigger_data *hist_data,
4150 struct action_data *data, char *system,
4151 char *event, char *var)
4153 struct hist_field *hist_field = NULL;
4154 struct field_var *field_var;
4157 * First try to create a field var on the target event (the
4158 * currently being defined). This will create a variable for
4159 * unqualified fields on the target event, or if qualified,
4160 * target fields that have qualified names matching the target.
4162 field_var = create_target_field_var(hist_data, system, event, var);
4164 if (field_var && !IS_ERR(field_var)) {
4165 save_field_var(hist_data, field_var);
4166 hist_field = field_var->var;
4170 * If no explicit system.event is specfied, default to
4171 * looking for fields on the onmatch(system.event.xxx)
4174 if (!system && data->handler == HANDLER_ONMATCH) {
4175 system = data->match_data.event_system;
4176 event = data->match_data.event;
4180 * At this point, we're looking at a field on another
4181 * event. Because we can't modify a hist trigger on
4182 * another event to add a variable for a field, we need
4183 * to create a new trigger on that event and create the
4184 * variable at the same time.
4186 hist_field = create_field_var_hist(hist_data, system, event, var);
4187 if (IS_ERR(hist_field))
4193 destroy_field_var(field_var);
4198 static int trace_action_create(struct hist_trigger_data *hist_data,
4199 struct action_data *data)
4201 struct trace_array *tr = hist_data->event_file->tr;
4202 char *event_name, *param, *system = NULL;
4203 struct hist_field *hist_field, *var_ref;
4204 unsigned int i, var_ref_idx;
4205 unsigned int field_pos = 0;
4206 struct synth_event *event;
4207 char *synth_event_name;
4210 lockdep_assert_held(&event_mutex);
4212 if (data->use_trace_keyword)
4213 synth_event_name = data->synth_event_name;
4215 synth_event_name = data->action_name;
4217 event = find_synth_event(synth_event_name);
4219 hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
4225 var_ref_idx = hist_data->n_var_refs;
4227 for (i = 0; i < data->n_params; i++) {
4230 p = param = kstrdup(data->params[i], GFP_KERNEL);
4236 system = strsep(¶m, ".");
4238 param = (char *)system;
4239 system = event_name = NULL;
4241 event_name = strsep(¶m, ".");
4249 if (param[0] == '$')
4250 hist_field = trace_action_find_var(hist_data, data,
4254 hist_field = trace_action_create_field_var(hist_data,
4266 if (check_synth_field(event, hist_field, field_pos) == 0) {
4267 var_ref = create_var_ref(hist_data, hist_field,
4268 system, event_name);
4280 hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
4286 if (field_pos != event->n_fields) {
4287 hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
4292 data->synth_event = event;
4293 data->var_ref_idx = var_ref_idx;
4302 static int action_create(struct hist_trigger_data *hist_data,
4303 struct action_data *data)
4305 struct trace_event_file *file = hist_data->event_file;
4306 struct trace_array *tr = file->tr;
4307 struct track_data *track_data;
4308 struct field_var *field_var;
4313 if (data->action == ACTION_TRACE)
4314 return trace_action_create(hist_data, data);
4316 if (data->action == ACTION_SNAPSHOT) {
4317 track_data = track_data_alloc(hist_data->key_size, data, hist_data);
4318 if (IS_ERR(track_data)) {
4319 ret = PTR_ERR(track_data);
4323 ret = tracing_snapshot_cond_enable(file->tr, track_data,
4324 cond_snapshot_update);
4326 track_data_free(track_data);
4331 if (data->action == ACTION_SAVE) {
4332 if (hist_data->n_save_vars) {
4334 hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
4338 for (i = 0; i < data->n_params; i++) {
4339 param = kstrdup(data->params[i], GFP_KERNEL);
4345 field_var = create_target_field_var(hist_data, NULL, NULL, param);
4346 if (IS_ERR(field_var)) {
4347 hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
4349 ret = PTR_ERR(field_var);
4354 hist_data->save_vars[hist_data->n_save_vars++] = field_var;
4355 if (field_var->val->flags & HIST_FIELD_FL_STRING)
4356 hist_data->n_save_var_str++;
4364 static int onmatch_create(struct hist_trigger_data *hist_data,
4365 struct action_data *data)
4367 return action_create(hist_data, data);
4370 static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
4372 char *match_event, *match_event_system;
4373 struct action_data *data;
4376 data = kzalloc(sizeof(*data), GFP_KERNEL);
4378 return ERR_PTR(-ENOMEM);
4380 match_event = strsep(&str, ")");
4381 if (!match_event || !str) {
4382 hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
4386 match_event_system = strsep(&match_event, ".");
4388 hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
4392 if (IS_ERR(event_file(tr, match_event_system, match_event))) {
4393 hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
4397 data->match_data.event = kstrdup(match_event, GFP_KERNEL);
4398 if (!data->match_data.event) {
4403 data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
4404 if (!data->match_data.event_system) {
4409 ret = action_parse(tr, str, data, HANDLER_ONMATCH);
4415 onmatch_destroy(data);
4416 data = ERR_PTR(ret);
4420 static int create_hitcount_val(struct hist_trigger_data *hist_data)
4422 hist_data->fields[HITCOUNT_IDX] =
4423 create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
4424 if (!hist_data->fields[HITCOUNT_IDX])
4427 hist_data->n_vals++;
4428 hist_data->n_fields++;
4430 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
4436 static int __create_val_field(struct hist_trigger_data *hist_data,
4437 unsigned int val_idx,
4438 struct trace_event_file *file,
4439 char *var_name, char *field_str,
4440 unsigned long flags)
4442 struct hist_field *hist_field;
4445 hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
4446 if (IS_ERR(hist_field)) {
4447 ret = PTR_ERR(hist_field);
4451 hist_data->fields[val_idx] = hist_field;
4453 ++hist_data->n_vals;
4454 ++hist_data->n_fields;
4456 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4462 static int create_val_field(struct hist_trigger_data *hist_data,
4463 unsigned int val_idx,
4464 struct trace_event_file *file,
4467 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
4470 return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
4473 static int create_var_field(struct hist_trigger_data *hist_data,
4474 unsigned int val_idx,
4475 struct trace_event_file *file,
4476 char *var_name, char *expr_str)
4478 struct trace_array *tr = hist_data->event_file->tr;
4479 unsigned long flags = 0;
4481 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
4484 if (find_var(hist_data, file, var_name) && !hist_data->remove) {
4485 hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
4489 flags |= HIST_FIELD_FL_VAR;
4490 hist_data->n_vars++;
4491 if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
4494 return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
4497 static int create_val_fields(struct hist_trigger_data *hist_data,
4498 struct trace_event_file *file)
4500 char *fields_str, *field_str;
4501 unsigned int i, j = 1;
4504 ret = create_hitcount_val(hist_data);
4508 fields_str = hist_data->attrs->vals_str;
4512 strsep(&fields_str, "=");
4516 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
4517 j < TRACING_MAP_VALS_MAX; i++) {
4518 field_str = strsep(&fields_str, ",");
4522 if (strcmp(field_str, "hitcount") == 0)
4525 ret = create_val_field(hist_data, j++, file, field_str);
4530 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
4536 static int create_key_field(struct hist_trigger_data *hist_data,
4537 unsigned int key_idx,
4538 unsigned int key_offset,
4539 struct trace_event_file *file,
4542 struct trace_array *tr = hist_data->event_file->tr;
4543 struct hist_field *hist_field = NULL;
4544 unsigned long flags = 0;
4545 unsigned int key_size;
4548 if (WARN_ON(key_idx >= HIST_FIELDS_MAX))
4551 flags |= HIST_FIELD_FL_KEY;
4553 if (strcmp(field_str, "stacktrace") == 0) {
4554 flags |= HIST_FIELD_FL_STACKTRACE;
4555 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
4556 hist_field = create_hist_field(hist_data, NULL, flags, NULL);
4558 hist_field = parse_expr(hist_data, file, field_str, flags,
4560 if (IS_ERR(hist_field)) {
4561 ret = PTR_ERR(hist_field);
4565 if (field_has_hist_vars(hist_field, 0)) {
4566 hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
4567 destroy_hist_field(hist_field, 0);
4572 key_size = hist_field->size;
4575 hist_data->fields[key_idx] = hist_field;
4577 key_size = ALIGN(key_size, sizeof(u64));
4578 hist_data->fields[key_idx]->size = key_size;
4579 hist_data->fields[key_idx]->offset = key_offset;
4581 hist_data->key_size += key_size;
4583 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
4588 hist_data->n_keys++;
4589 hist_data->n_fields++;
4591 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
4599 static int create_key_fields(struct hist_trigger_data *hist_data,
4600 struct trace_event_file *file)
4602 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
4603 char *fields_str, *field_str;
4606 fields_str = hist_data->attrs->keys_str;
4610 strsep(&fields_str, "=");
4614 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
4615 field_str = strsep(&fields_str, ",");
4618 ret = create_key_field(hist_data, i, key_offset,
4633 static int create_var_fields(struct hist_trigger_data *hist_data,
4634 struct trace_event_file *file)
4636 unsigned int i, j = hist_data->n_vals;
4639 unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
4641 for (i = 0; i < n_vars; i++) {
4642 char *var_name = hist_data->attrs->var_defs.name[i];
4643 char *expr = hist_data->attrs->var_defs.expr[i];
4645 ret = create_var_field(hist_data, j++, file, var_name, expr);
4653 static void free_var_defs(struct hist_trigger_data *hist_data)
4657 for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
4658 kfree(hist_data->attrs->var_defs.name[i]);
4659 kfree(hist_data->attrs->var_defs.expr[i]);
4662 hist_data->attrs->var_defs.n_vars = 0;
4665 static int parse_var_defs(struct hist_trigger_data *hist_data)
4667 struct trace_array *tr = hist_data->event_file->tr;
4668 char *s, *str, *var_name, *field_str;
4669 unsigned int i, j, n_vars = 0;
4672 for (i = 0; i < hist_data->attrs->n_assignments; i++) {
4673 str = hist_data->attrs->assignment_str[i];
4674 for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
4675 field_str = strsep(&str, ",");
4679 var_name = strsep(&field_str, "=");
4680 if (!var_name || !field_str) {
4681 hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
4687 if (n_vars == TRACING_MAP_VARS_MAX) {
4688 hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
4693 s = kstrdup(var_name, GFP_KERNEL);
4698 hist_data->attrs->var_defs.name[n_vars] = s;
4700 s = kstrdup(field_str, GFP_KERNEL);
4702 kfree(hist_data->attrs->var_defs.name[n_vars]);
4706 hist_data->attrs->var_defs.expr[n_vars++] = s;
4708 hist_data->attrs->var_defs.n_vars = n_vars;
4714 free_var_defs(hist_data);
4719 static int create_hist_fields(struct hist_trigger_data *hist_data,
4720 struct trace_event_file *file)
4724 ret = parse_var_defs(hist_data);
4728 ret = create_val_fields(hist_data, file);
4732 ret = create_var_fields(hist_data, file);
4736 ret = create_key_fields(hist_data, file);
4740 free_var_defs(hist_data);
4745 static int is_descending(const char *str)
4750 if (strcmp(str, "descending") == 0)
4753 if (strcmp(str, "ascending") == 0)
4759 static int create_sort_keys(struct hist_trigger_data *hist_data)
4761 char *fields_str = hist_data->attrs->sort_key_str;
4762 struct tracing_map_sort_key *sort_key;
4763 int descending, ret = 0;
4764 unsigned int i, j, k;
4766 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
4771 strsep(&fields_str, "=");
4777 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
4778 struct hist_field *hist_field;
4779 char *field_str, *field_name;
4780 const char *test_name;
4782 sort_key = &hist_data->sort_keys[i];
4784 field_str = strsep(&fields_str, ",");
4791 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
4796 field_name = strsep(&field_str, ".");
4802 if (strcmp(field_name, "hitcount") == 0) {
4803 descending = is_descending(field_str);
4804 if (descending < 0) {
4808 sort_key->descending = descending;
4812 for (j = 1, k = 1; j < hist_data->n_fields; j++) {
4815 hist_field = hist_data->fields[j];
4816 if (hist_field->flags & HIST_FIELD_FL_VAR)
4821 test_name = hist_field_name(hist_field, 0);
4823 if (strcmp(field_name, test_name) == 0) {
4824 sort_key->field_idx = idx;
4825 descending = is_descending(field_str);
4826 if (descending < 0) {
4830 sort_key->descending = descending;
4834 if (j == hist_data->n_fields) {
4840 hist_data->n_sort_keys = i;
4845 static void destroy_actions(struct hist_trigger_data *hist_data)
4849 for (i = 0; i < hist_data->n_actions; i++) {
4850 struct action_data *data = hist_data->actions[i];
4852 if (data->handler == HANDLER_ONMATCH)
4853 onmatch_destroy(data);
4854 else if (data->handler == HANDLER_ONMAX ||
4855 data->handler == HANDLER_ONCHANGE)
4856 track_data_destroy(hist_data, data);
4862 static int parse_actions(struct hist_trigger_data *hist_data)
4864 struct trace_array *tr = hist_data->event_file->tr;
4865 struct action_data *data;
4871 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4872 str = hist_data->attrs->action_str[i];
4874 if ((len = str_has_prefix(str, "onmatch("))) {
4875 char *action_str = str + len;
4877 data = onmatch_parse(tr, action_str);
4879 ret = PTR_ERR(data);
4882 } else if ((len = str_has_prefix(str, "onmax("))) {
4883 char *action_str = str + len;
4885 data = track_data_parse(hist_data, action_str,
4888 ret = PTR_ERR(data);
4891 } else if ((len = str_has_prefix(str, "onchange("))) {
4892 char *action_str = str + len;
4894 data = track_data_parse(hist_data, action_str,
4897 ret = PTR_ERR(data);
4905 hist_data->actions[hist_data->n_actions++] = data;
4911 static int create_actions(struct hist_trigger_data *hist_data)
4913 struct action_data *data;
4917 for (i = 0; i < hist_data->attrs->n_actions; i++) {
4918 data = hist_data->actions[i];
4920 if (data->handler == HANDLER_ONMATCH) {
4921 ret = onmatch_create(hist_data, data);
4924 } else if (data->handler == HANDLER_ONMAX ||
4925 data->handler == HANDLER_ONCHANGE) {
4926 ret = track_data_create(hist_data, data);
4938 static void print_actions(struct seq_file *m,
4939 struct hist_trigger_data *hist_data,
4940 struct tracing_map_elt *elt)
4944 for (i = 0; i < hist_data->n_actions; i++) {
4945 struct action_data *data = hist_data->actions[i];
4947 if (data->action == ACTION_SNAPSHOT)
4950 if (data->handler == HANDLER_ONMAX ||
4951 data->handler == HANDLER_ONCHANGE)
4952 track_data_print(m, hist_data, elt, data);
4956 static void print_action_spec(struct seq_file *m,
4957 struct hist_trigger_data *hist_data,
4958 struct action_data *data)
4962 if (data->action == ACTION_SAVE) {
4963 for (i = 0; i < hist_data->n_save_vars; i++) {
4964 seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
4965 if (i < hist_data->n_save_vars - 1)
4968 } else if (data->action == ACTION_TRACE) {
4969 if (data->use_trace_keyword)
4970 seq_printf(m, "%s", data->synth_event_name);
4971 for (i = 0; i < data->n_params; i++) {
4972 if (i || data->use_trace_keyword)
4974 seq_printf(m, "%s", data->params[i]);
4979 static void print_track_data_spec(struct seq_file *m,
4980 struct hist_trigger_data *hist_data,
4981 struct action_data *data)
4983 if (data->handler == HANDLER_ONMAX)
4984 seq_puts(m, ":onmax(");
4985 else if (data->handler == HANDLER_ONCHANGE)
4986 seq_puts(m, ":onchange(");
4987 seq_printf(m, "%s", data->track_data.var_str);
4988 seq_printf(m, ").%s(", data->action_name);
4990 print_action_spec(m, hist_data, data);
4995 static void print_onmatch_spec(struct seq_file *m,
4996 struct hist_trigger_data *hist_data,
4997 struct action_data *data)
4999 seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
5000 data->match_data.event);
5002 seq_printf(m, "%s(", data->action_name);
5004 print_action_spec(m, hist_data, data);
5009 static bool actions_match(struct hist_trigger_data *hist_data,
5010 struct hist_trigger_data *hist_data_test)
5014 if (hist_data->n_actions != hist_data_test->n_actions)
5017 for (i = 0; i < hist_data->n_actions; i++) {
5018 struct action_data *data = hist_data->actions[i];
5019 struct action_data *data_test = hist_data_test->actions[i];
5020 char *action_name, *action_name_test;
5022 if (data->handler != data_test->handler)
5024 if (data->action != data_test->action)
5027 if (data->n_params != data_test->n_params)
5030 for (j = 0; j < data->n_params; j++) {
5031 if (strcmp(data->params[j], data_test->params[j]) != 0)
5035 if (data->use_trace_keyword)
5036 action_name = data->synth_event_name;
5038 action_name = data->action_name;
5040 if (data_test->use_trace_keyword)
5041 action_name_test = data_test->synth_event_name;
5043 action_name_test = data_test->action_name;
5045 if (strcmp(action_name, action_name_test) != 0)
5048 if (data->handler == HANDLER_ONMATCH) {
5049 if (strcmp(data->match_data.event_system,
5050 data_test->match_data.event_system) != 0)
5052 if (strcmp(data->match_data.event,
5053 data_test->match_data.event) != 0)
5055 } else if (data->handler == HANDLER_ONMAX ||
5056 data->handler == HANDLER_ONCHANGE) {
5057 if (strcmp(data->track_data.var_str,
5058 data_test->track_data.var_str) != 0)
5067 static void print_actions_spec(struct seq_file *m,
5068 struct hist_trigger_data *hist_data)
5072 for (i = 0; i < hist_data->n_actions; i++) {
5073 struct action_data *data = hist_data->actions[i];
5075 if (data->handler == HANDLER_ONMATCH)
5076 print_onmatch_spec(m, hist_data, data);
5077 else if (data->handler == HANDLER_ONMAX ||
5078 data->handler == HANDLER_ONCHANGE)
5079 print_track_data_spec(m, hist_data, data);
5083 static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
5087 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5088 kfree(hist_data->field_var_hists[i]->cmd);
5089 kfree(hist_data->field_var_hists[i]);
5093 static void destroy_hist_data(struct hist_trigger_data *hist_data)
5098 destroy_hist_trigger_attrs(hist_data->attrs);
5099 destroy_hist_fields(hist_data);
5100 tracing_map_destroy(hist_data->map);
5102 destroy_actions(hist_data);
5103 destroy_field_vars(hist_data);
5104 destroy_field_var_hists(hist_data);
5109 static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
5111 struct tracing_map *map = hist_data->map;
5112 struct ftrace_event_field *field;
5113 struct hist_field *hist_field;
5116 for_each_hist_field(i, hist_data) {
5117 hist_field = hist_data->fields[i];
5118 if (hist_field->flags & HIST_FIELD_FL_KEY) {
5119 tracing_map_cmp_fn_t cmp_fn;
5121 field = hist_field->field;
5123 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
5124 cmp_fn = tracing_map_cmp_none;
5126 cmp_fn = tracing_map_cmp_num(hist_field->size,
5127 hist_field->is_signed);
5128 else if (is_string_field(field))
5129 cmp_fn = tracing_map_cmp_string;
5131 cmp_fn = tracing_map_cmp_num(field->size,
5133 idx = tracing_map_add_key_field(map,
5136 } else if (!(hist_field->flags & HIST_FIELD_FL_VAR))
5137 idx = tracing_map_add_sum_field(map);
5142 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5143 idx = tracing_map_add_var(map);
5146 hist_field->var.idx = idx;
5147 hist_field->var.hist_data = hist_data;
5154 static struct hist_trigger_data *
5155 create_hist_data(unsigned int map_bits,
5156 struct hist_trigger_attrs *attrs,
5157 struct trace_event_file *file,
5160 const struct tracing_map_ops *map_ops = NULL;
5161 struct hist_trigger_data *hist_data;
5164 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
5166 return ERR_PTR(-ENOMEM);
5168 hist_data->attrs = attrs;
5169 hist_data->remove = remove;
5170 hist_data->event_file = file;
5172 ret = parse_actions(hist_data);
5176 ret = create_hist_fields(hist_data, file);
5180 ret = create_sort_keys(hist_data);
5184 map_ops = &hist_trigger_elt_data_ops;
5186 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
5187 map_ops, hist_data);
5188 if (IS_ERR(hist_data->map)) {
5189 ret = PTR_ERR(hist_data->map);
5190 hist_data->map = NULL;
5194 ret = create_tracing_map_fields(hist_data);
5200 hist_data->attrs = NULL;
5202 destroy_hist_data(hist_data);
5204 hist_data = ERR_PTR(ret);
5209 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
5210 struct tracing_map_elt *elt, void *rec,
5211 struct ring_buffer_event *rbe,
5214 struct hist_elt_data *elt_data;
5215 struct hist_field *hist_field;
5216 unsigned int i, var_idx;
5219 elt_data = elt->private_data;
5220 elt_data->var_ref_vals = var_ref_vals;
5222 for_each_hist_val_field(i, hist_data) {
5223 hist_field = hist_data->fields[i];
5224 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
5225 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5226 var_idx = hist_field->var.idx;
5227 tracing_map_set_var(elt, var_idx, hist_val);
5230 tracing_map_update_sum(elt, i, hist_val);
5233 for_each_hist_key_field(i, hist_data) {
5234 hist_field = hist_data->fields[i];
5235 if (hist_field->flags & HIST_FIELD_FL_VAR) {
5236 hist_val = hist_field->fn(hist_field, elt, rbe, rec);
5237 var_idx = hist_field->var.idx;
5238 tracing_map_set_var(elt, var_idx, hist_val);
5242 update_field_vars(hist_data, elt, rbe, rec);
5245 static inline void add_to_key(char *compound_key, void *key,
5246 struct hist_field *key_field, void *rec)
5248 size_t size = key_field->size;
5250 if (key_field->flags & HIST_FIELD_FL_STRING) {
5251 struct ftrace_event_field *field;
5253 field = key_field->field;
5254 if (field->filter_type == FILTER_DYN_STRING)
5255 size = *(u32 *)(rec + field->offset) >> 16;
5256 else if (field->filter_type == FILTER_PTR_STRING)
5258 else if (field->filter_type == FILTER_STATIC_STRING)
5261 /* ensure NULL-termination */
5262 if (size > key_field->size - 1)
5263 size = key_field->size - 1;
5265 strncpy(compound_key + key_field->offset, (char *)key, size);
5267 memcpy(compound_key + key_field->offset, key, size);
5271 hist_trigger_actions(struct hist_trigger_data *hist_data,
5272 struct tracing_map_elt *elt, void *rec,
5273 struct ring_buffer_event *rbe, void *key,
5276 struct action_data *data;
5279 for (i = 0; i < hist_data->n_actions; i++) {
5280 data = hist_data->actions[i];
5281 data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
5285 static void event_hist_trigger(struct event_trigger_data *data, void *rec,
5286 struct ring_buffer_event *rbe)
5288 struct hist_trigger_data *hist_data = data->private_data;
5289 bool use_compound_key = (hist_data->n_keys > 1);
5290 unsigned long entries[HIST_STACKTRACE_DEPTH];
5291 u64 var_ref_vals[TRACING_MAP_VARS_MAX];
5292 char compound_key[HIST_KEY_SIZE_MAX];
5293 struct tracing_map_elt *elt = NULL;
5294 struct hist_field *key_field;
5299 memset(compound_key, 0, hist_data->key_size);
5301 for_each_hist_key_field(i, hist_data) {
5302 key_field = hist_data->fields[i];
5304 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5305 memset(entries, 0, HIST_STACKTRACE_SIZE);
5306 stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
5307 HIST_STACKTRACE_SKIP);
5310 field_contents = key_field->fn(key_field, elt, rbe, rec);
5311 if (key_field->flags & HIST_FIELD_FL_STRING) {
5312 key = (void *)(unsigned long)field_contents;
5313 use_compound_key = true;
5315 key = (void *)&field_contents;
5318 if (use_compound_key)
5319 add_to_key(compound_key, key, key_field, rec);
5322 if (use_compound_key)
5325 if (hist_data->n_var_refs &&
5326 !resolve_var_refs(hist_data, key, var_ref_vals, false))
5329 elt = tracing_map_insert(hist_data->map, key);
5333 hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
5335 if (resolve_var_refs(hist_data, key, var_ref_vals, true))
5336 hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
5339 static void hist_trigger_stacktrace_print(struct seq_file *m,
5340 unsigned long *stacktrace_entries,
5341 unsigned int max_entries)
5343 char str[KSYM_SYMBOL_LEN];
5344 unsigned int spaces = 8;
5347 for (i = 0; i < max_entries; i++) {
5348 if (!stacktrace_entries[i])
5351 seq_printf(m, "%*c", 1 + spaces, ' ');
5352 sprint_symbol(str, stacktrace_entries[i]);
5353 seq_printf(m, "%s\n", str);
5357 static void hist_trigger_print_key(struct seq_file *m,
5358 struct hist_trigger_data *hist_data,
5360 struct tracing_map_elt *elt)
5362 struct hist_field *key_field;
5363 char str[KSYM_SYMBOL_LEN];
5364 bool multiline = false;
5365 const char *field_name;
5371 for_each_hist_key_field(i, hist_data) {
5372 key_field = hist_data->fields[i];
5374 if (i > hist_data->n_vals)
5377 field_name = hist_field_name(key_field, 0);
5379 if (key_field->flags & HIST_FIELD_FL_HEX) {
5380 uval = *(u64 *)(key + key_field->offset);
5381 seq_printf(m, "%s: %llx", field_name, uval);
5382 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
5383 uval = *(u64 *)(key + key_field->offset);
5384 sprint_symbol_no_offset(str, uval);
5385 seq_printf(m, "%s: [%llx] %-45s", field_name,
5387 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
5388 uval = *(u64 *)(key + key_field->offset);
5389 sprint_symbol(str, uval);
5390 seq_printf(m, "%s: [%llx] %-55s", field_name,
5392 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
5393 struct hist_elt_data *elt_data = elt->private_data;
5396 if (WARN_ON_ONCE(!elt_data))
5399 comm = elt_data->comm;
5401 uval = *(u64 *)(key + key_field->offset);
5402 seq_printf(m, "%s: %-16s[%10llu]", field_name,
5404 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
5405 const char *syscall_name;
5407 uval = *(u64 *)(key + key_field->offset);
5408 syscall_name = get_syscall_name(uval);
5410 syscall_name = "unknown_syscall";
5412 seq_printf(m, "%s: %-30s[%3llu]", field_name,
5413 syscall_name, uval);
5414 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
5415 seq_puts(m, "stacktrace:\n");
5416 hist_trigger_stacktrace_print(m,
5417 key + key_field->offset,
5418 HIST_STACKTRACE_DEPTH);
5420 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
5421 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
5422 *(u64 *)(key + key_field->offset));
5423 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
5424 seq_printf(m, "%s: %-50s", field_name,
5425 (char *)(key + key_field->offset));
5427 uval = *(u64 *)(key + key_field->offset);
5428 seq_printf(m, "%s: %10llu", field_name, uval);
5438 static void hist_trigger_entry_print(struct seq_file *m,
5439 struct hist_trigger_data *hist_data,
5441 struct tracing_map_elt *elt)
5443 const char *field_name;
5446 hist_trigger_print_key(m, hist_data, key, elt);
5448 seq_printf(m, " hitcount: %10llu",
5449 tracing_map_read_sum(elt, HITCOUNT_IDX));
5451 for (i = 1; i < hist_data->n_vals; i++) {
5452 field_name = hist_field_name(hist_data->fields[i], 0);
5454 if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
5455 hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
5458 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
5459 seq_printf(m, " %s: %10llx", field_name,
5460 tracing_map_read_sum(elt, i));
5462 seq_printf(m, " %s: %10llu", field_name,
5463 tracing_map_read_sum(elt, i));
5467 print_actions(m, hist_data, elt);
5472 static int print_entries(struct seq_file *m,
5473 struct hist_trigger_data *hist_data)
5475 struct tracing_map_sort_entry **sort_entries = NULL;
5476 struct tracing_map *map = hist_data->map;
5479 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
5480 hist_data->n_sort_keys,
5485 for (i = 0; i < n_entries; i++)
5486 hist_trigger_entry_print(m, hist_data,
5487 sort_entries[i]->key,
5488 sort_entries[i]->elt);
5490 tracing_map_destroy_sort_entries(sort_entries, n_entries);
5495 static void hist_trigger_show(struct seq_file *m,
5496 struct event_trigger_data *data, int n)
5498 struct hist_trigger_data *hist_data;
5502 seq_puts(m, "\n\n");
5504 seq_puts(m, "# event histogram\n#\n# trigger info: ");
5505 data->ops->print(m, data->ops, data);
5506 seq_puts(m, "#\n\n");
5508 hist_data = data->private_data;
5509 n_entries = print_entries(m, hist_data);
5513 track_data_snapshot_print(m, hist_data);
5515 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
5516 (u64)atomic64_read(&hist_data->map->hits),
5517 n_entries, (u64)atomic64_read(&hist_data->map->drops));
5520 static int hist_show(struct seq_file *m, void *v)
5522 struct event_trigger_data *data;
5523 struct trace_event_file *event_file;
5526 mutex_lock(&event_mutex);
5528 event_file = event_file_data(m->private);
5529 if (unlikely(!event_file)) {
5534 list_for_each_entry_rcu(data, &event_file->triggers, list) {
5535 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
5536 hist_trigger_show(m, data, n++);
5540 mutex_unlock(&event_mutex);
5545 static int event_hist_open(struct inode *inode, struct file *file)
5549 ret = security_locked_down(LOCKDOWN_TRACEFS);
5553 return single_open(file, hist_show, file);
5556 const struct file_operations event_hist_fops = {
5557 .open = event_hist_open,
5559 .llseek = seq_lseek,
5560 .release = single_release,
5563 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
5565 const char *field_name = hist_field_name(hist_field, 0);
5567 if (hist_field->var.name)
5568 seq_printf(m, "%s=", hist_field->var.name);
5570 if (hist_field->flags & HIST_FIELD_FL_CPU)
5572 else if (field_name) {
5573 if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
5574 hist_field->flags & HIST_FIELD_FL_ALIAS)
5576 seq_printf(m, "%s", field_name);
5577 } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
5578 seq_puts(m, "common_timestamp");
5580 if (hist_field->flags) {
5581 if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
5582 !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
5583 const char *flags = get_hist_field_flags(hist_field);
5586 seq_printf(m, ".%s", flags);
5591 static int event_hist_trigger_print(struct seq_file *m,
5592 struct event_trigger_ops *ops,
5593 struct event_trigger_data *data)
5595 struct hist_trigger_data *hist_data = data->private_data;
5596 struct hist_field *field;
5597 bool have_var = false;
5600 seq_puts(m, "hist:");
5603 seq_printf(m, "%s:", data->name);
5605 seq_puts(m, "keys=");
5607 for_each_hist_key_field(i, hist_data) {
5608 field = hist_data->fields[i];
5610 if (i > hist_data->n_vals)
5613 if (field->flags & HIST_FIELD_FL_STACKTRACE)
5614 seq_puts(m, "stacktrace");
5616 hist_field_print(m, field);
5619 seq_puts(m, ":vals=");
5621 for_each_hist_val_field(i, hist_data) {
5622 field = hist_data->fields[i];
5623 if (field->flags & HIST_FIELD_FL_VAR) {
5628 if (i == HITCOUNT_IDX)
5629 seq_puts(m, "hitcount");
5632 hist_field_print(m, field);
5641 for_each_hist_val_field(i, hist_data) {
5642 field = hist_data->fields[i];
5644 if (field->flags & HIST_FIELD_FL_VAR) {
5647 hist_field_print(m, field);
5652 seq_puts(m, ":sort=");
5654 for (i = 0; i < hist_data->n_sort_keys; i++) {
5655 struct tracing_map_sort_key *sort_key;
5656 unsigned int idx, first_key_idx;
5659 first_key_idx = hist_data->n_vals - hist_data->n_vars;
5661 sort_key = &hist_data->sort_keys[i];
5662 idx = sort_key->field_idx;
5664 if (WARN_ON(idx >= HIST_FIELDS_MAX))
5670 if (idx == HITCOUNT_IDX)
5671 seq_puts(m, "hitcount");
5673 if (idx >= first_key_idx)
5674 idx += hist_data->n_vars;
5675 hist_field_print(m, hist_data->fields[idx]);
5678 if (sort_key->descending)
5679 seq_puts(m, ".descending");
5681 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
5682 if (hist_data->enable_timestamps)
5683 seq_printf(m, ":clock=%s", hist_data->attrs->clock);
5685 print_actions_spec(m, hist_data);
5687 if (data->filter_str)
5688 seq_printf(m, " if %s", data->filter_str);
5691 seq_puts(m, " [paused]");
5693 seq_puts(m, " [active]");
5700 static int event_hist_trigger_init(struct event_trigger_ops *ops,
5701 struct event_trigger_data *data)
5703 struct hist_trigger_data *hist_data = data->private_data;
5705 if (!data->ref && hist_data->attrs->name)
5706 save_named_trigger(hist_data->attrs->name, data);
5713 static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
5715 struct trace_event_file *file;
5720 for (i = 0; i < hist_data->n_field_var_hists; i++) {
5721 file = hist_data->field_var_hists[i]->hist_data->event_file;
5722 cmd = hist_data->field_var_hists[i]->cmd;
5723 ret = event_hist_trigger_func(&trigger_hist_cmd, file,
5724 "!hist", "hist", cmd);
5728 static void event_hist_trigger_free(struct event_trigger_ops *ops,
5729 struct event_trigger_data *data)
5731 struct hist_trigger_data *hist_data = data->private_data;
5733 if (WARN_ON_ONCE(data->ref <= 0))
5739 del_named_trigger(data);
5741 trigger_data_free(data);
5743 remove_hist_vars(hist_data);
5745 unregister_field_var_hists(hist_data);
5747 destroy_hist_data(hist_data);
5751 static struct event_trigger_ops event_hist_trigger_ops = {
5752 .func = event_hist_trigger,
5753 .print = event_hist_trigger_print,
5754 .init = event_hist_trigger_init,
5755 .free = event_hist_trigger_free,
5758 static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
5759 struct event_trigger_data *data)
5763 save_named_trigger(data->named_data->name, data);
5765 event_hist_trigger_init(ops, data->named_data);
5770 static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
5771 struct event_trigger_data *data)
5773 if (WARN_ON_ONCE(data->ref <= 0))
5776 event_hist_trigger_free(ops, data->named_data);
5780 del_named_trigger(data);
5781 trigger_data_free(data);
5785 static struct event_trigger_ops event_hist_trigger_named_ops = {
5786 .func = event_hist_trigger,
5787 .print = event_hist_trigger_print,
5788 .init = event_hist_trigger_named_init,
5789 .free = event_hist_trigger_named_free,
5792 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
5795 return &event_hist_trigger_ops;
5798 static void hist_clear(struct event_trigger_data *data)
5800 struct hist_trigger_data *hist_data = data->private_data;
5803 pause_named_trigger(data);
5805 tracepoint_synchronize_unregister();
5807 tracing_map_clear(hist_data->map);
5810 unpause_named_trigger(data);
5813 static bool compatible_field(struct ftrace_event_field *field,
5814 struct ftrace_event_field *test_field)
5816 if (field == test_field)
5818 if (field == NULL || test_field == NULL)
5820 if (strcmp(field->name, test_field->name) != 0)
5822 if (strcmp(field->type, test_field->type) != 0)
5824 if (field->size != test_field->size)
5826 if (field->is_signed != test_field->is_signed)
5832 static bool hist_trigger_match(struct event_trigger_data *data,
5833 struct event_trigger_data *data_test,
5834 struct event_trigger_data *named_data,
5837 struct tracing_map_sort_key *sort_key, *sort_key_test;
5838 struct hist_trigger_data *hist_data, *hist_data_test;
5839 struct hist_field *key_field, *key_field_test;
5842 if (named_data && (named_data != data_test) &&
5843 (named_data != data_test->named_data))
5846 if (!named_data && is_named_trigger(data_test))
5849 hist_data = data->private_data;
5850 hist_data_test = data_test->private_data;
5852 if (hist_data->n_vals != hist_data_test->n_vals ||
5853 hist_data->n_fields != hist_data_test->n_fields ||
5854 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
5857 if (!ignore_filter) {
5858 if ((data->filter_str && !data_test->filter_str) ||
5859 (!data->filter_str && data_test->filter_str))
5863 for_each_hist_field(i, hist_data) {
5864 key_field = hist_data->fields[i];
5865 key_field_test = hist_data_test->fields[i];
5867 if (key_field->flags != key_field_test->flags)
5869 if (!compatible_field(key_field->field, key_field_test->field))
5871 if (key_field->offset != key_field_test->offset)
5873 if (key_field->size != key_field_test->size)
5875 if (key_field->is_signed != key_field_test->is_signed)
5877 if (!!key_field->var.name != !!key_field_test->var.name)
5879 if (key_field->var.name &&
5880 strcmp(key_field->var.name, key_field_test->var.name) != 0)
5884 for (i = 0; i < hist_data->n_sort_keys; i++) {
5885 sort_key = &hist_data->sort_keys[i];
5886 sort_key_test = &hist_data_test->sort_keys[i];
5888 if (sort_key->field_idx != sort_key_test->field_idx ||
5889 sort_key->descending != sort_key_test->descending)
5893 if (!ignore_filter && data->filter_str &&
5894 (strcmp(data->filter_str, data_test->filter_str) != 0))
5897 if (!actions_match(hist_data, hist_data_test))
5903 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
5904 struct event_trigger_data *data,
5905 struct trace_event_file *file)
5907 struct hist_trigger_data *hist_data = data->private_data;
5908 struct event_trigger_data *test, *named_data = NULL;
5909 struct trace_array *tr = file->tr;
5912 if (hist_data->attrs->name) {
5913 named_data = find_named_trigger(hist_data->attrs->name);
5915 if (!hist_trigger_match(data, named_data, named_data,
5917 hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
5924 if (hist_data->attrs->name && !named_data)
5927 list_for_each_entry_rcu(test, &file->triggers, list) {
5928 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
5929 if (!hist_trigger_match(data, test, named_data, false))
5931 if (hist_data->attrs->pause)
5932 test->paused = true;
5933 else if (hist_data->attrs->cont)
5934 test->paused = false;
5935 else if (hist_data->attrs->clear)
5938 hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
5945 if (hist_data->attrs->cont || hist_data->attrs->clear) {
5946 hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
5951 if (hist_data->attrs->pause)
5952 data->paused = true;
5955 data->private_data = named_data->private_data;
5956 set_named_trigger_data(data, named_data);
5957 data->ops = &event_hist_trigger_named_ops;
5960 if (data->ops->init) {
5961 ret = data->ops->init(data->ops, data);
5966 if (hist_data->enable_timestamps) {
5967 char *clock = hist_data->attrs->clock;
5969 ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
5971 hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
5975 tracing_set_time_stamp_abs(file->tr, true);
5979 destroy_hist_data(hist_data);
5986 static int hist_trigger_enable(struct event_trigger_data *data,
5987 struct trace_event_file *file)
5991 list_add_tail_rcu(&data->list, &file->triggers);
5993 update_cond_flag(file);
5995 if (trace_event_trigger_enable_disable(file, 1) < 0) {
5996 list_del_rcu(&data->list);
5997 update_cond_flag(file);
6004 static bool have_hist_trigger_match(struct event_trigger_data *data,
6005 struct trace_event_file *file)
6007 struct hist_trigger_data *hist_data = data->private_data;
6008 struct event_trigger_data *test, *named_data = NULL;
6011 if (hist_data->attrs->name)
6012 named_data = find_named_trigger(hist_data->attrs->name);
6014 list_for_each_entry_rcu(test, &file->triggers, list) {
6015 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6016 if (hist_trigger_match(data, test, named_data, false)) {
6026 static bool hist_trigger_check_refs(struct event_trigger_data *data,
6027 struct trace_event_file *file)
6029 struct hist_trigger_data *hist_data = data->private_data;
6030 struct event_trigger_data *test, *named_data = NULL;
6032 if (hist_data->attrs->name)
6033 named_data = find_named_trigger(hist_data->attrs->name);
6035 list_for_each_entry_rcu(test, &file->triggers, list) {
6036 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6037 if (!hist_trigger_match(data, test, named_data, false))
6039 hist_data = test->private_data;
6040 if (check_var_refs(hist_data))
6049 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
6050 struct event_trigger_data *data,
6051 struct trace_event_file *file)
6053 struct hist_trigger_data *hist_data = data->private_data;
6054 struct event_trigger_data *test, *named_data = NULL;
6055 bool unregistered = false;
6057 if (hist_data->attrs->name)
6058 named_data = find_named_trigger(hist_data->attrs->name);
6060 list_for_each_entry_rcu(test, &file->triggers, list) {
6061 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6062 if (!hist_trigger_match(data, test, named_data, false))
6064 unregistered = true;
6065 list_del_rcu(&test->list);
6066 trace_event_trigger_enable_disable(file, 0);
6067 update_cond_flag(file);
6072 if (unregistered && test->ops->free)
6073 test->ops->free(test->ops, test);
6075 if (hist_data->enable_timestamps) {
6076 if (!hist_data->remove || unregistered)
6077 tracing_set_time_stamp_abs(file->tr, false);
6081 static bool hist_file_check_refs(struct trace_event_file *file)
6083 struct hist_trigger_data *hist_data;
6084 struct event_trigger_data *test;
6086 list_for_each_entry_rcu(test, &file->triggers, list) {
6087 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6088 hist_data = test->private_data;
6089 if (check_var_refs(hist_data))
6097 static void hist_unreg_all(struct trace_event_file *file)
6099 struct event_trigger_data *test, *n;
6100 struct hist_trigger_data *hist_data;
6101 struct synth_event *se;
6102 const char *se_name;
6104 lockdep_assert_held(&event_mutex);
6106 if (hist_file_check_refs(file))
6109 list_for_each_entry_safe(test, n, &file->triggers, list) {
6110 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6111 hist_data = test->private_data;
6112 list_del_rcu(&test->list);
6113 trace_event_trigger_enable_disable(file, 0);
6115 se_name = trace_event_name(file->event_call);
6116 se = find_synth_event(se_name);
6120 update_cond_flag(file);
6121 if (hist_data->enable_timestamps)
6122 tracing_set_time_stamp_abs(file->tr, false);
6123 if (test->ops->free)
6124 test->ops->free(test->ops, test);
6129 static int event_hist_trigger_func(struct event_command *cmd_ops,
6130 struct trace_event_file *file,
6131 char *glob, char *cmd, char *param)
6133 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
6134 struct event_trigger_data *trigger_data;
6135 struct hist_trigger_attrs *attrs;
6136 struct event_trigger_ops *trigger_ops;
6137 struct hist_trigger_data *hist_data;
6138 struct synth_event *se;
6139 const char *se_name;
6140 bool remove = false;
6144 lockdep_assert_held(&event_mutex);
6146 if (glob && strlen(glob)) {
6148 last_cmd_set(file, param);
6158 * separate the trigger from the filter (k:v [if filter])
6159 * allowing for whitespace in the trigger
6161 p = trigger = param;
6163 p = strstr(p, "if");
6168 if (*(p - 1) != ' ' && *(p - 1) != '\t') {
6172 if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
6174 if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
6185 param = strstrip(p);
6186 trigger = strstrip(trigger);
6189 attrs = parse_hist_trigger_attrs(file->tr, trigger);
6191 return PTR_ERR(attrs);
6193 if (attrs->map_bits)
6194 hist_trigger_bits = attrs->map_bits;
6196 hist_data = create_hist_data(hist_trigger_bits, attrs, file, remove);
6197 if (IS_ERR(hist_data)) {
6198 destroy_hist_trigger_attrs(attrs);
6199 return PTR_ERR(hist_data);
6202 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
6204 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
6205 if (!trigger_data) {
6210 trigger_data->count = -1;
6211 trigger_data->ops = trigger_ops;
6212 trigger_data->cmd_ops = cmd_ops;
6214 INIT_LIST_HEAD(&trigger_data->list);
6215 RCU_INIT_POINTER(trigger_data->filter, NULL);
6217 trigger_data->private_data = hist_data;
6219 /* if param is non-empty, it's supposed to be a filter */
6220 if (param && cmd_ops->set_filter) {
6221 ret = cmd_ops->set_filter(param, trigger_data, file);
6227 if (!have_hist_trigger_match(trigger_data, file))
6230 if (hist_trigger_check_refs(trigger_data, file)) {
6235 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
6236 se_name = trace_event_name(file->event_call);
6237 se = find_synth_event(se_name);
6244 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
6246 * The above returns on success the # of triggers registered,
6247 * but if it didn't register any it returns zero. Consider no
6248 * triggers registered a failure too.
6251 if (!(attrs->pause || attrs->cont || attrs->clear))
6257 if (get_named_trigger_data(trigger_data))
6260 if (has_hist_vars(hist_data))
6261 save_hist_vars(hist_data);
6263 ret = create_actions(hist_data);
6267 ret = tracing_map_init(hist_data->map);
6271 ret = hist_trigger_enable(trigger_data, file);
6275 se_name = trace_event_name(file->event_call);
6276 se = find_synth_event(se_name);
6279 /* Just return zero, not the number of registered triggers */
6287 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
6289 if (cmd_ops->set_filter)
6290 cmd_ops->set_filter(NULL, trigger_data, NULL);
6292 remove_hist_vars(hist_data);
6294 kfree(trigger_data);
6296 destroy_hist_data(hist_data);
6300 static struct event_command trigger_hist_cmd = {
6302 .trigger_type = ETT_EVENT_HIST,
6303 .flags = EVENT_CMD_FL_NEEDS_REC,
6304 .func = event_hist_trigger_func,
6305 .reg = hist_register_trigger,
6306 .unreg = hist_unregister_trigger,
6307 .unreg_all = hist_unreg_all,
6308 .get_trigger_ops = event_hist_get_trigger_ops,
6309 .set_filter = set_trigger_filter,
6312 __init int register_trigger_hist_cmd(void)
6316 ret = register_event_command(&trigger_hist_cmd);
6323 hist_enable_trigger(struct event_trigger_data *data, void *rec,
6324 struct ring_buffer_event *event)
6326 struct enable_trigger_data *enable_data = data->private_data;
6327 struct event_trigger_data *test;
6329 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
6330 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
6331 if (enable_data->enable)
6332 test->paused = false;
6334 test->paused = true;
6340 hist_enable_count_trigger(struct event_trigger_data *data, void *rec,
6341 struct ring_buffer_event *event)
6346 if (data->count != -1)
6349 hist_enable_trigger(data, rec, event);
6352 static struct event_trigger_ops hist_enable_trigger_ops = {
6353 .func = hist_enable_trigger,
6354 .print = event_enable_trigger_print,
6355 .init = event_trigger_init,
6356 .free = event_enable_trigger_free,
6359 static struct event_trigger_ops hist_enable_count_trigger_ops = {
6360 .func = hist_enable_count_trigger,
6361 .print = event_enable_trigger_print,
6362 .init = event_trigger_init,
6363 .free = event_enable_trigger_free,
6366 static struct event_trigger_ops hist_disable_trigger_ops = {
6367 .func = hist_enable_trigger,
6368 .print = event_enable_trigger_print,
6369 .init = event_trigger_init,
6370 .free = event_enable_trigger_free,
6373 static struct event_trigger_ops hist_disable_count_trigger_ops = {
6374 .func = hist_enable_count_trigger,
6375 .print = event_enable_trigger_print,
6376 .init = event_trigger_init,
6377 .free = event_enable_trigger_free,
6380 static struct event_trigger_ops *
6381 hist_enable_get_trigger_ops(char *cmd, char *param)
6383 struct event_trigger_ops *ops;
6386 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
6389 ops = param ? &hist_enable_count_trigger_ops :
6390 &hist_enable_trigger_ops;
6392 ops = param ? &hist_disable_count_trigger_ops :
6393 &hist_disable_trigger_ops;
6398 static void hist_enable_unreg_all(struct trace_event_file *file)
6400 struct event_trigger_data *test, *n;
6402 list_for_each_entry_safe(test, n, &file->triggers, list) {
6403 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
6404 list_del_rcu(&test->list);
6405 update_cond_flag(file);
6406 trace_event_trigger_enable_disable(file, 0);
6407 if (test->ops->free)
6408 test->ops->free(test->ops, test);
6413 static struct event_command trigger_hist_enable_cmd = {
6414 .name = ENABLE_HIST_STR,
6415 .trigger_type = ETT_HIST_ENABLE,
6416 .func = event_enable_trigger_func,
6417 .reg = event_enable_register_trigger,
6418 .unreg = event_enable_unregister_trigger,
6419 .unreg_all = hist_enable_unreg_all,
6420 .get_trigger_ops = hist_enable_get_trigger_ops,
6421 .set_filter = set_trigger_filter,
6424 static struct event_command trigger_hist_disable_cmd = {
6425 .name = DISABLE_HIST_STR,
6426 .trigger_type = ETT_HIST_ENABLE,
6427 .func = event_enable_trigger_func,
6428 .reg = event_enable_register_trigger,
6429 .unreg = event_enable_unregister_trigger,
6430 .unreg_all = hist_enable_unreg_all,
6431 .get_trigger_ops = hist_enable_get_trigger_ops,
6432 .set_filter = set_trigger_filter,
6435 static __init void unregister_trigger_hist_enable_disable_cmds(void)
6437 unregister_event_command(&trigger_hist_enable_cmd);
6438 unregister_event_command(&trigger_hist_disable_cmd);
6441 __init int register_trigger_hist_enable_disable_cmds(void)
6445 ret = register_event_command(&trigger_hist_enable_cmd);
6446 if (WARN_ON(ret < 0))
6448 ret = register_event_command(&trigger_hist_disable_cmd);
6449 if (WARN_ON(ret < 0))
6450 unregister_trigger_hist_enable_disable_cmds();
6455 static __init int trace_events_hist_init(void)
6457 struct dentry *entry = NULL;
6458 struct dentry *d_tracer;
6461 err = dyn_event_register(&synth_event_ops);
6463 pr_warn("Could not register synth_event_ops\n");
6467 d_tracer = tracing_init_dentry();
6468 if (IS_ERR(d_tracer)) {
6469 err = PTR_ERR(d_tracer);
6473 entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
6474 NULL, &synth_events_fops);
6482 pr_warn("Could not create tracefs 'synthetic_events' entry\n");
6487 fs_initcall(trace_events_hist_init);