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![Tom Zanussi](/assets/img/avatar_default.png)
This fixes a use-after-free case flagged by KASAN; make sure the test happens before the potential free in this case. Link: http://lkml.kernel.org/r/48fd74ab61bebd7dca9714386bb47d7c5ccd6a7b.1467247517.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
1755 lines
41 KiB
C
1755 lines
41 KiB
C
/*
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* trace_events_hist - trace event hist triggers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
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*/
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/stacktrace.h>
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#include "tracing_map.h"
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#include "trace.h"
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struct hist_field;
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typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event);
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struct hist_field {
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struct ftrace_event_field *field;
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unsigned long flags;
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hist_field_fn_t fn;
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unsigned int size;
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unsigned int offset;
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};
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static u64 hist_field_none(struct hist_field *field, void *event)
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{
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return 0;
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}
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static u64 hist_field_counter(struct hist_field *field, void *event)
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{
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return 1;
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}
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static u64 hist_field_string(struct hist_field *hist_field, void *event)
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{
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char *addr = (char *)(event + hist_field->field->offset);
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return (u64)(unsigned long)addr;
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}
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static u64 hist_field_dynstring(struct hist_field *hist_field, void *event)
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{
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u32 str_item = *(u32 *)(event + hist_field->field->offset);
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int str_loc = str_item & 0xffff;
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char *addr = (char *)(event + str_loc);
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return (u64)(unsigned long)addr;
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}
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static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
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{
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char **addr = (char **)(event + hist_field->field->offset);
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return (u64)(unsigned long)*addr;
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}
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static u64 hist_field_log2(struct hist_field *hist_field, void *event)
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{
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u64 val = *(u64 *)(event + hist_field->field->offset);
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return (u64) ilog2(roundup_pow_of_two(val));
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}
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#define DEFINE_HIST_FIELD_FN(type) \
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static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
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{ \
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type *addr = (type *)(event + hist_field->field->offset); \
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\
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return (u64)(unsigned long)*addr; \
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}
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DEFINE_HIST_FIELD_FN(s64);
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DEFINE_HIST_FIELD_FN(u64);
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DEFINE_HIST_FIELD_FN(s32);
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DEFINE_HIST_FIELD_FN(u32);
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DEFINE_HIST_FIELD_FN(s16);
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DEFINE_HIST_FIELD_FN(u16);
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DEFINE_HIST_FIELD_FN(s8);
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DEFINE_HIST_FIELD_FN(u8);
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#define for_each_hist_field(i, hist_data) \
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for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
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#define for_each_hist_val_field(i, hist_data) \
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for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
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#define for_each_hist_key_field(i, hist_data) \
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for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
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#define HIST_STACKTRACE_DEPTH 16
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#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
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#define HIST_STACKTRACE_SKIP 5
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#define HITCOUNT_IDX 0
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#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
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enum hist_field_flags {
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HIST_FIELD_FL_HITCOUNT = 1,
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HIST_FIELD_FL_KEY = 2,
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HIST_FIELD_FL_STRING = 4,
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HIST_FIELD_FL_HEX = 8,
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HIST_FIELD_FL_SYM = 16,
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HIST_FIELD_FL_SYM_OFFSET = 32,
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HIST_FIELD_FL_EXECNAME = 64,
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HIST_FIELD_FL_SYSCALL = 128,
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HIST_FIELD_FL_STACKTRACE = 256,
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HIST_FIELD_FL_LOG2 = 512,
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};
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struct hist_trigger_attrs {
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char *keys_str;
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char *vals_str;
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char *sort_key_str;
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char *name;
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bool pause;
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bool cont;
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bool clear;
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unsigned int map_bits;
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};
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struct hist_trigger_data {
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struct hist_field *fields[TRACING_MAP_FIELDS_MAX];
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unsigned int n_vals;
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unsigned int n_keys;
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unsigned int n_fields;
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unsigned int key_size;
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struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
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unsigned int n_sort_keys;
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struct trace_event_file *event_file;
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struct hist_trigger_attrs *attrs;
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struct tracing_map *map;
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};
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static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
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{
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hist_field_fn_t fn = NULL;
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switch (field_size) {
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case 8:
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if (field_is_signed)
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fn = hist_field_s64;
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else
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fn = hist_field_u64;
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break;
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case 4:
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if (field_is_signed)
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fn = hist_field_s32;
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else
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fn = hist_field_u32;
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break;
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case 2:
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if (field_is_signed)
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fn = hist_field_s16;
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else
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fn = hist_field_u16;
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break;
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case 1:
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if (field_is_signed)
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fn = hist_field_s8;
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else
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fn = hist_field_u8;
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break;
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}
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return fn;
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}
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static int parse_map_size(char *str)
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{
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unsigned long size, map_bits;
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int ret;
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strsep(&str, "=");
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if (!str) {
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ret = -EINVAL;
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goto out;
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}
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ret = kstrtoul(str, 0, &size);
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if (ret)
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goto out;
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map_bits = ilog2(roundup_pow_of_two(size));
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if (map_bits < TRACING_MAP_BITS_MIN ||
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map_bits > TRACING_MAP_BITS_MAX)
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ret = -EINVAL;
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else
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ret = map_bits;
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out:
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return ret;
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}
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static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
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{
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if (!attrs)
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return;
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kfree(attrs->name);
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kfree(attrs->sort_key_str);
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kfree(attrs->keys_str);
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kfree(attrs->vals_str);
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kfree(attrs);
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}
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static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
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{
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struct hist_trigger_attrs *attrs;
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int ret = 0;
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attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
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if (!attrs)
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return ERR_PTR(-ENOMEM);
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while (trigger_str) {
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char *str = strsep(&trigger_str, ":");
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if ((strncmp(str, "key=", strlen("key=")) == 0) ||
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(strncmp(str, "keys=", strlen("keys=")) == 0))
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attrs->keys_str = kstrdup(str, GFP_KERNEL);
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else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
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(strncmp(str, "vals=", strlen("vals=")) == 0) ||
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(strncmp(str, "values=", strlen("values=")) == 0))
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attrs->vals_str = kstrdup(str, GFP_KERNEL);
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else if (strncmp(str, "sort=", strlen("sort=")) == 0)
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attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
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else if (strncmp(str, "name=", strlen("name=")) == 0)
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attrs->name = kstrdup(str, GFP_KERNEL);
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else if (strcmp(str, "pause") == 0)
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attrs->pause = true;
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else if ((strcmp(str, "cont") == 0) ||
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(strcmp(str, "continue") == 0))
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attrs->cont = true;
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else if (strcmp(str, "clear") == 0)
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attrs->clear = true;
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else if (strncmp(str, "size=", strlen("size=")) == 0) {
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int map_bits = parse_map_size(str);
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if (map_bits < 0) {
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ret = map_bits;
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goto free;
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}
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attrs->map_bits = map_bits;
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} else {
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ret = -EINVAL;
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goto free;
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}
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}
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if (!attrs->keys_str) {
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ret = -EINVAL;
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goto free;
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}
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return attrs;
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free:
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destroy_hist_trigger_attrs(attrs);
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return ERR_PTR(ret);
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}
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static inline void save_comm(char *comm, struct task_struct *task)
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{
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if (!task->pid) {
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strcpy(comm, "<idle>");
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return;
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}
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if (WARN_ON_ONCE(task->pid < 0)) {
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strcpy(comm, "<XXX>");
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return;
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}
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memcpy(comm, task->comm, TASK_COMM_LEN);
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}
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static void hist_trigger_elt_comm_free(struct tracing_map_elt *elt)
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{
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kfree((char *)elt->private_data);
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}
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static int hist_trigger_elt_comm_alloc(struct tracing_map_elt *elt)
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{
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struct hist_trigger_data *hist_data = elt->map->private_data;
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struct hist_field *key_field;
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unsigned int i;
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for_each_hist_key_field(i, hist_data) {
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key_field = hist_data->fields[i];
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if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
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unsigned int size = TASK_COMM_LEN + 1;
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elt->private_data = kzalloc(size, GFP_KERNEL);
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if (!elt->private_data)
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return -ENOMEM;
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break;
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}
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}
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return 0;
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}
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static void hist_trigger_elt_comm_copy(struct tracing_map_elt *to,
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struct tracing_map_elt *from)
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{
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char *comm_from = from->private_data;
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char *comm_to = to->private_data;
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if (comm_from)
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memcpy(comm_to, comm_from, TASK_COMM_LEN + 1);
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}
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static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt)
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{
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char *comm = elt->private_data;
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if (comm)
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save_comm(comm, current);
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}
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static const struct tracing_map_ops hist_trigger_elt_comm_ops = {
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.elt_alloc = hist_trigger_elt_comm_alloc,
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.elt_copy = hist_trigger_elt_comm_copy,
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.elt_free = hist_trigger_elt_comm_free,
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.elt_init = hist_trigger_elt_comm_init,
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};
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static void destroy_hist_field(struct hist_field *hist_field)
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{
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kfree(hist_field);
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}
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static struct hist_field *create_hist_field(struct ftrace_event_field *field,
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unsigned long flags)
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{
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struct hist_field *hist_field;
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if (field && is_function_field(field))
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return NULL;
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hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
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if (!hist_field)
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return NULL;
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if (flags & HIST_FIELD_FL_HITCOUNT) {
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hist_field->fn = hist_field_counter;
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goto out;
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}
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if (flags & HIST_FIELD_FL_STACKTRACE) {
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hist_field->fn = hist_field_none;
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goto out;
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}
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if (flags & HIST_FIELD_FL_LOG2) {
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hist_field->fn = hist_field_log2;
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goto out;
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}
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|
|
if (WARN_ON_ONCE(!field))
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goto out;
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|
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if (is_string_field(field)) {
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flags |= HIST_FIELD_FL_STRING;
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|
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if (field->filter_type == FILTER_STATIC_STRING)
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hist_field->fn = hist_field_string;
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else if (field->filter_type == FILTER_DYN_STRING)
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hist_field->fn = hist_field_dynstring;
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else
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hist_field->fn = hist_field_pstring;
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} else {
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hist_field->fn = select_value_fn(field->size,
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field->is_signed);
|
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if (!hist_field->fn) {
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destroy_hist_field(hist_field);
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return NULL;
|
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}
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}
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out:
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hist_field->field = field;
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hist_field->flags = flags;
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|
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return hist_field;
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|
}
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|
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static void destroy_hist_fields(struct hist_trigger_data *hist_data)
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{
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unsigned int i;
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|
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for (i = 0; i < TRACING_MAP_FIELDS_MAX; i++) {
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if (hist_data->fields[i]) {
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destroy_hist_field(hist_data->fields[i]);
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hist_data->fields[i] = NULL;
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}
|
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}
|
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}
|
|
|
|
static int create_hitcount_val(struct hist_trigger_data *hist_data)
|
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{
|
|
hist_data->fields[HITCOUNT_IDX] =
|
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create_hist_field(NULL, HIST_FIELD_FL_HITCOUNT);
|
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if (!hist_data->fields[HITCOUNT_IDX])
|
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return -ENOMEM;
|
|
|
|
hist_data->n_vals++;
|
|
|
|
if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int create_val_field(struct hist_trigger_data *hist_data,
|
|
unsigned int val_idx,
|
|
struct trace_event_file *file,
|
|
char *field_str)
|
|
{
|
|
struct ftrace_event_field *field = NULL;
|
|
unsigned long flags = 0;
|
|
char *field_name;
|
|
int ret = 0;
|
|
|
|
if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
|
|
return -EINVAL;
|
|
|
|
field_name = strsep(&field_str, ".");
|
|
if (field_str) {
|
|
if (strcmp(field_str, "hex") == 0)
|
|
flags |= HIST_FIELD_FL_HEX;
|
|
else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
field = trace_find_event_field(file->event_call, field_name);
|
|
if (!field) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
hist_data->fields[val_idx] = create_hist_field(field, flags);
|
|
if (!hist_data->fields[val_idx]) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
++hist_data->n_vals;
|
|
|
|
if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
|
|
ret = -EINVAL;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int create_val_fields(struct hist_trigger_data *hist_data,
|
|
struct trace_event_file *file)
|
|
{
|
|
char *fields_str, *field_str;
|
|
unsigned int i, j;
|
|
int ret;
|
|
|
|
ret = create_hitcount_val(hist_data);
|
|
if (ret)
|
|
goto out;
|
|
|
|
fields_str = hist_data->attrs->vals_str;
|
|
if (!fields_str)
|
|
goto out;
|
|
|
|
strsep(&fields_str, "=");
|
|
if (!fields_str)
|
|
goto out;
|
|
|
|
for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
|
|
j < TRACING_MAP_VALS_MAX; i++) {
|
|
field_str = strsep(&fields_str, ",");
|
|
if (!field_str)
|
|
break;
|
|
if (strcmp(field_str, "hitcount") == 0)
|
|
continue;
|
|
ret = create_val_field(hist_data, j++, file, field_str);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
if (fields_str && (strcmp(fields_str, "hitcount") != 0))
|
|
ret = -EINVAL;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int create_key_field(struct hist_trigger_data *hist_data,
|
|
unsigned int key_idx,
|
|
unsigned int key_offset,
|
|
struct trace_event_file *file,
|
|
char *field_str)
|
|
{
|
|
struct ftrace_event_field *field = NULL;
|
|
unsigned long flags = 0;
|
|
unsigned int key_size;
|
|
int ret = 0;
|
|
|
|
if (WARN_ON(key_idx >= TRACING_MAP_FIELDS_MAX))
|
|
return -EINVAL;
|
|
|
|
flags |= HIST_FIELD_FL_KEY;
|
|
|
|
if (strcmp(field_str, "stacktrace") == 0) {
|
|
flags |= HIST_FIELD_FL_STACKTRACE;
|
|
key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
|
|
} else {
|
|
char *field_name = strsep(&field_str, ".");
|
|
|
|
if (field_str) {
|
|
if (strcmp(field_str, "hex") == 0)
|
|
flags |= HIST_FIELD_FL_HEX;
|
|
else if (strcmp(field_str, "sym") == 0)
|
|
flags |= HIST_FIELD_FL_SYM;
|
|
else if (strcmp(field_str, "sym-offset") == 0)
|
|
flags |= HIST_FIELD_FL_SYM_OFFSET;
|
|
else if ((strcmp(field_str, "execname") == 0) &&
|
|
(strcmp(field_name, "common_pid") == 0))
|
|
flags |= HIST_FIELD_FL_EXECNAME;
|
|
else if (strcmp(field_str, "syscall") == 0)
|
|
flags |= HIST_FIELD_FL_SYSCALL;
|
|
else if (strcmp(field_str, "log2") == 0)
|
|
flags |= HIST_FIELD_FL_LOG2;
|
|
else {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
field = trace_find_event_field(file->event_call, field_name);
|
|
if (!field) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (is_string_field(field))
|
|
key_size = MAX_FILTER_STR_VAL;
|
|
else
|
|
key_size = field->size;
|
|
}
|
|
|
|
hist_data->fields[key_idx] = create_hist_field(field, flags);
|
|
if (!hist_data->fields[key_idx]) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
key_size = ALIGN(key_size, sizeof(u64));
|
|
hist_data->fields[key_idx]->size = key_size;
|
|
hist_data->fields[key_idx]->offset = key_offset;
|
|
hist_data->key_size += key_size;
|
|
if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
hist_data->n_keys++;
|
|
|
|
if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
|
|
return -EINVAL;
|
|
|
|
ret = key_size;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int create_key_fields(struct hist_trigger_data *hist_data,
|
|
struct trace_event_file *file)
|
|
{
|
|
unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
|
|
char *fields_str, *field_str;
|
|
int ret = -EINVAL;
|
|
|
|
fields_str = hist_data->attrs->keys_str;
|
|
if (!fields_str)
|
|
goto out;
|
|
|
|
strsep(&fields_str, "=");
|
|
if (!fields_str)
|
|
goto out;
|
|
|
|
for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
|
|
field_str = strsep(&fields_str, ",");
|
|
if (!field_str)
|
|
break;
|
|
ret = create_key_field(hist_data, i, key_offset,
|
|
file, field_str);
|
|
if (ret < 0)
|
|
goto out;
|
|
key_offset += ret;
|
|
}
|
|
if (fields_str) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int create_hist_fields(struct hist_trigger_data *hist_data,
|
|
struct trace_event_file *file)
|
|
{
|
|
int ret;
|
|
|
|
ret = create_val_fields(hist_data, file);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = create_key_fields(hist_data, file);
|
|
if (ret)
|
|
goto out;
|
|
|
|
hist_data->n_fields = hist_data->n_vals + hist_data->n_keys;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int is_descending(const char *str)
|
|
{
|
|
if (!str)
|
|
return 0;
|
|
|
|
if (strcmp(str, "descending") == 0)
|
|
return 1;
|
|
|
|
if (strcmp(str, "ascending") == 0)
|
|
return 0;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int create_sort_keys(struct hist_trigger_data *hist_data)
|
|
{
|
|
char *fields_str = hist_data->attrs->sort_key_str;
|
|
struct ftrace_event_field *field = NULL;
|
|
struct tracing_map_sort_key *sort_key;
|
|
int descending, ret = 0;
|
|
unsigned int i, j;
|
|
|
|
hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
|
|
|
|
if (!fields_str)
|
|
goto out;
|
|
|
|
strsep(&fields_str, "=");
|
|
if (!fields_str) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
|
|
char *field_str, *field_name;
|
|
|
|
sort_key = &hist_data->sort_keys[i];
|
|
|
|
field_str = strsep(&fields_str, ",");
|
|
if (!field_str) {
|
|
if (i == 0)
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
field_name = strsep(&field_str, ".");
|
|
if (!field_name) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (strcmp(field_name, "hitcount") == 0) {
|
|
descending = is_descending(field_str);
|
|
if (descending < 0) {
|
|
ret = descending;
|
|
break;
|
|
}
|
|
sort_key->descending = descending;
|
|
continue;
|
|
}
|
|
|
|
for (j = 1; j < hist_data->n_fields; j++) {
|
|
field = hist_data->fields[j]->field;
|
|
if (field && (strcmp(field_name, field->name) == 0)) {
|
|
sort_key->field_idx = j;
|
|
descending = is_descending(field_str);
|
|
if (descending < 0) {
|
|
ret = descending;
|
|
goto out;
|
|
}
|
|
sort_key->descending = descending;
|
|
break;
|
|
}
|
|
}
|
|
if (j == hist_data->n_fields) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
hist_data->n_sort_keys = i;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void destroy_hist_data(struct hist_trigger_data *hist_data)
|
|
{
|
|
destroy_hist_trigger_attrs(hist_data->attrs);
|
|
destroy_hist_fields(hist_data);
|
|
tracing_map_destroy(hist_data->map);
|
|
kfree(hist_data);
|
|
}
|
|
|
|
static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
|
|
{
|
|
struct tracing_map *map = hist_data->map;
|
|
struct ftrace_event_field *field;
|
|
struct hist_field *hist_field;
|
|
int i, idx;
|
|
|
|
for_each_hist_field(i, hist_data) {
|
|
hist_field = hist_data->fields[i];
|
|
if (hist_field->flags & HIST_FIELD_FL_KEY) {
|
|
tracing_map_cmp_fn_t cmp_fn;
|
|
|
|
field = hist_field->field;
|
|
|
|
if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
|
|
cmp_fn = tracing_map_cmp_none;
|
|
else if (is_string_field(field))
|
|
cmp_fn = tracing_map_cmp_string;
|
|
else
|
|
cmp_fn = tracing_map_cmp_num(field->size,
|
|
field->is_signed);
|
|
idx = tracing_map_add_key_field(map,
|
|
hist_field->offset,
|
|
cmp_fn);
|
|
|
|
} else
|
|
idx = tracing_map_add_sum_field(map);
|
|
|
|
if (idx < 0)
|
|
return idx;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool need_tracing_map_ops(struct hist_trigger_data *hist_data)
|
|
{
|
|
struct hist_field *key_field;
|
|
unsigned int i;
|
|
|
|
for_each_hist_key_field(i, hist_data) {
|
|
key_field = hist_data->fields[i];
|
|
|
|
if (key_field->flags & HIST_FIELD_FL_EXECNAME)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static struct hist_trigger_data *
|
|
create_hist_data(unsigned int map_bits,
|
|
struct hist_trigger_attrs *attrs,
|
|
struct trace_event_file *file)
|
|
{
|
|
const struct tracing_map_ops *map_ops = NULL;
|
|
struct hist_trigger_data *hist_data;
|
|
int ret = 0;
|
|
|
|
hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
|
|
if (!hist_data)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
hist_data->attrs = attrs;
|
|
|
|
ret = create_hist_fields(hist_data, file);
|
|
if (ret)
|
|
goto free;
|
|
|
|
ret = create_sort_keys(hist_data);
|
|
if (ret)
|
|
goto free;
|
|
|
|
if (need_tracing_map_ops(hist_data))
|
|
map_ops = &hist_trigger_elt_comm_ops;
|
|
|
|
hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
|
|
map_ops, hist_data);
|
|
if (IS_ERR(hist_data->map)) {
|
|
ret = PTR_ERR(hist_data->map);
|
|
hist_data->map = NULL;
|
|
goto free;
|
|
}
|
|
|
|
ret = create_tracing_map_fields(hist_data);
|
|
if (ret)
|
|
goto free;
|
|
|
|
ret = tracing_map_init(hist_data->map);
|
|
if (ret)
|
|
goto free;
|
|
|
|
hist_data->event_file = file;
|
|
out:
|
|
return hist_data;
|
|
free:
|
|
hist_data->attrs = NULL;
|
|
|
|
destroy_hist_data(hist_data);
|
|
|
|
hist_data = ERR_PTR(ret);
|
|
|
|
goto out;
|
|
}
|
|
|
|
static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
|
|
struct tracing_map_elt *elt,
|
|
void *rec)
|
|
{
|
|
struct hist_field *hist_field;
|
|
unsigned int i;
|
|
u64 hist_val;
|
|
|
|
for_each_hist_val_field(i, hist_data) {
|
|
hist_field = hist_data->fields[i];
|
|
hist_val = hist_field->fn(hist_field, rec);
|
|
tracing_map_update_sum(elt, i, hist_val);
|
|
}
|
|
}
|
|
|
|
static inline void add_to_key(char *compound_key, void *key,
|
|
struct hist_field *key_field, void *rec)
|
|
{
|
|
size_t size = key_field->size;
|
|
|
|
if (key_field->flags & HIST_FIELD_FL_STRING) {
|
|
struct ftrace_event_field *field;
|
|
|
|
field = key_field->field;
|
|
if (field->filter_type == FILTER_DYN_STRING)
|
|
size = *(u32 *)(rec + field->offset) >> 16;
|
|
else if (field->filter_type == FILTER_PTR_STRING)
|
|
size = strlen(key);
|
|
else if (field->filter_type == FILTER_STATIC_STRING)
|
|
size = field->size;
|
|
|
|
/* ensure NULL-termination */
|
|
if (size > key_field->size - 1)
|
|
size = key_field->size - 1;
|
|
}
|
|
|
|
memcpy(compound_key + key_field->offset, key, size);
|
|
}
|
|
|
|
static void event_hist_trigger(struct event_trigger_data *data, void *rec)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
bool use_compound_key = (hist_data->n_keys > 1);
|
|
unsigned long entries[HIST_STACKTRACE_DEPTH];
|
|
char compound_key[HIST_KEY_SIZE_MAX];
|
|
struct stack_trace stacktrace;
|
|
struct hist_field *key_field;
|
|
struct tracing_map_elt *elt;
|
|
u64 field_contents;
|
|
void *key = NULL;
|
|
unsigned int i;
|
|
|
|
memset(compound_key, 0, hist_data->key_size);
|
|
|
|
for_each_hist_key_field(i, hist_data) {
|
|
key_field = hist_data->fields[i];
|
|
|
|
if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
|
|
stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
|
|
stacktrace.entries = entries;
|
|
stacktrace.nr_entries = 0;
|
|
stacktrace.skip = HIST_STACKTRACE_SKIP;
|
|
|
|
memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
|
|
save_stack_trace(&stacktrace);
|
|
|
|
key = entries;
|
|
} else {
|
|
field_contents = key_field->fn(key_field, rec);
|
|
if (key_field->flags & HIST_FIELD_FL_STRING) {
|
|
key = (void *)(unsigned long)field_contents;
|
|
use_compound_key = true;
|
|
} else
|
|
key = (void *)&field_contents;
|
|
}
|
|
|
|
if (use_compound_key)
|
|
add_to_key(compound_key, key, key_field, rec);
|
|
}
|
|
|
|
if (use_compound_key)
|
|
key = compound_key;
|
|
|
|
elt = tracing_map_insert(hist_data->map, key);
|
|
if (elt)
|
|
hist_trigger_elt_update(hist_data, elt, rec);
|
|
}
|
|
|
|
static void hist_trigger_stacktrace_print(struct seq_file *m,
|
|
unsigned long *stacktrace_entries,
|
|
unsigned int max_entries)
|
|
{
|
|
char str[KSYM_SYMBOL_LEN];
|
|
unsigned int spaces = 8;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < max_entries; i++) {
|
|
if (stacktrace_entries[i] == ULONG_MAX)
|
|
return;
|
|
|
|
seq_printf(m, "%*c", 1 + spaces, ' ');
|
|
sprint_symbol(str, stacktrace_entries[i]);
|
|
seq_printf(m, "%s\n", str);
|
|
}
|
|
}
|
|
|
|
static void
|
|
hist_trigger_entry_print(struct seq_file *m,
|
|
struct hist_trigger_data *hist_data, void *key,
|
|
struct tracing_map_elt *elt)
|
|
{
|
|
struct hist_field *key_field;
|
|
char str[KSYM_SYMBOL_LEN];
|
|
bool multiline = false;
|
|
unsigned int i;
|
|
u64 uval;
|
|
|
|
seq_puts(m, "{ ");
|
|
|
|
for_each_hist_key_field(i, hist_data) {
|
|
key_field = hist_data->fields[i];
|
|
|
|
if (i > hist_data->n_vals)
|
|
seq_puts(m, ", ");
|
|
|
|
if (key_field->flags & HIST_FIELD_FL_HEX) {
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
seq_printf(m, "%s: %llx",
|
|
key_field->field->name, uval);
|
|
} else if (key_field->flags & HIST_FIELD_FL_SYM) {
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
sprint_symbol_no_offset(str, uval);
|
|
seq_printf(m, "%s: [%llx] %-45s",
|
|
key_field->field->name, uval, str);
|
|
} else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
sprint_symbol(str, uval);
|
|
seq_printf(m, "%s: [%llx] %-55s",
|
|
key_field->field->name, uval, str);
|
|
} else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
|
|
char *comm = elt->private_data;
|
|
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
seq_printf(m, "%s: %-16s[%10llu]",
|
|
key_field->field->name, comm, uval);
|
|
} else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
|
|
const char *syscall_name;
|
|
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
syscall_name = get_syscall_name(uval);
|
|
if (!syscall_name)
|
|
syscall_name = "unknown_syscall";
|
|
|
|
seq_printf(m, "%s: %-30s[%3llu]",
|
|
key_field->field->name, syscall_name, uval);
|
|
} else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
|
|
seq_puts(m, "stacktrace:\n");
|
|
hist_trigger_stacktrace_print(m,
|
|
key + key_field->offset,
|
|
HIST_STACKTRACE_DEPTH);
|
|
multiline = true;
|
|
} else if (key_field->flags & HIST_FIELD_FL_LOG2) {
|
|
seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name,
|
|
*(u64 *)(key + key_field->offset));
|
|
} else if (key_field->flags & HIST_FIELD_FL_STRING) {
|
|
seq_printf(m, "%s: %-50s", key_field->field->name,
|
|
(char *)(key + key_field->offset));
|
|
} else {
|
|
uval = *(u64 *)(key + key_field->offset);
|
|
seq_printf(m, "%s: %10llu", key_field->field->name,
|
|
uval);
|
|
}
|
|
}
|
|
|
|
if (!multiline)
|
|
seq_puts(m, " ");
|
|
|
|
seq_puts(m, "}");
|
|
|
|
seq_printf(m, " hitcount: %10llu",
|
|
tracing_map_read_sum(elt, HITCOUNT_IDX));
|
|
|
|
for (i = 1; i < hist_data->n_vals; i++) {
|
|
if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
|
|
seq_printf(m, " %s: %10llx",
|
|
hist_data->fields[i]->field->name,
|
|
tracing_map_read_sum(elt, i));
|
|
} else {
|
|
seq_printf(m, " %s: %10llu",
|
|
hist_data->fields[i]->field->name,
|
|
tracing_map_read_sum(elt, i));
|
|
}
|
|
}
|
|
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
static int print_entries(struct seq_file *m,
|
|
struct hist_trigger_data *hist_data)
|
|
{
|
|
struct tracing_map_sort_entry **sort_entries = NULL;
|
|
struct tracing_map *map = hist_data->map;
|
|
int i, n_entries;
|
|
|
|
n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
|
|
hist_data->n_sort_keys,
|
|
&sort_entries);
|
|
if (n_entries < 0)
|
|
return n_entries;
|
|
|
|
for (i = 0; i < n_entries; i++)
|
|
hist_trigger_entry_print(m, hist_data,
|
|
sort_entries[i]->key,
|
|
sort_entries[i]->elt);
|
|
|
|
tracing_map_destroy_sort_entries(sort_entries, n_entries);
|
|
|
|
return n_entries;
|
|
}
|
|
|
|
static void hist_trigger_show(struct seq_file *m,
|
|
struct event_trigger_data *data, int n)
|
|
{
|
|
struct hist_trigger_data *hist_data;
|
|
int n_entries, ret = 0;
|
|
|
|
if (n > 0)
|
|
seq_puts(m, "\n\n");
|
|
|
|
seq_puts(m, "# event histogram\n#\n# trigger info: ");
|
|
data->ops->print(m, data->ops, data);
|
|
seq_puts(m, "#\n\n");
|
|
|
|
hist_data = data->private_data;
|
|
n_entries = print_entries(m, hist_data);
|
|
if (n_entries < 0) {
|
|
ret = n_entries;
|
|
n_entries = 0;
|
|
}
|
|
|
|
seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
|
|
(u64)atomic64_read(&hist_data->map->hits),
|
|
n_entries, (u64)atomic64_read(&hist_data->map->drops));
|
|
}
|
|
|
|
static int hist_show(struct seq_file *m, void *v)
|
|
{
|
|
struct event_trigger_data *data;
|
|
struct trace_event_file *event_file;
|
|
int n = 0, ret = 0;
|
|
|
|
mutex_lock(&event_mutex);
|
|
|
|
event_file = event_file_data(m->private);
|
|
if (unlikely(!event_file)) {
|
|
ret = -ENODEV;
|
|
goto out_unlock;
|
|
}
|
|
|
|
list_for_each_entry_rcu(data, &event_file->triggers, list) {
|
|
if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
|
|
hist_trigger_show(m, data, n++);
|
|
}
|
|
|
|
out_unlock:
|
|
mutex_unlock(&event_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int event_hist_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, hist_show, file);
|
|
}
|
|
|
|
const struct file_operations event_hist_fops = {
|
|
.open = event_hist_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static const char *get_hist_field_flags(struct hist_field *hist_field)
|
|
{
|
|
const char *flags_str = NULL;
|
|
|
|
if (hist_field->flags & HIST_FIELD_FL_HEX)
|
|
flags_str = "hex";
|
|
else if (hist_field->flags & HIST_FIELD_FL_SYM)
|
|
flags_str = "sym";
|
|
else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
|
|
flags_str = "sym-offset";
|
|
else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
|
|
flags_str = "execname";
|
|
else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
|
|
flags_str = "syscall";
|
|
else if (hist_field->flags & HIST_FIELD_FL_LOG2)
|
|
flags_str = "log2";
|
|
|
|
return flags_str;
|
|
}
|
|
|
|
static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
|
|
{
|
|
seq_printf(m, "%s", hist_field->field->name);
|
|
if (hist_field->flags) {
|
|
const char *flags_str = get_hist_field_flags(hist_field);
|
|
|
|
if (flags_str)
|
|
seq_printf(m, ".%s", flags_str);
|
|
}
|
|
}
|
|
|
|
static int event_hist_trigger_print(struct seq_file *m,
|
|
struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
struct hist_field *key_field;
|
|
unsigned int i;
|
|
|
|
seq_puts(m, "hist:");
|
|
|
|
if (data->name)
|
|
seq_printf(m, "%s:", data->name);
|
|
|
|
seq_puts(m, "keys=");
|
|
|
|
for_each_hist_key_field(i, hist_data) {
|
|
key_field = hist_data->fields[i];
|
|
|
|
if (i > hist_data->n_vals)
|
|
seq_puts(m, ",");
|
|
|
|
if (key_field->flags & HIST_FIELD_FL_STACKTRACE)
|
|
seq_puts(m, "stacktrace");
|
|
else
|
|
hist_field_print(m, key_field);
|
|
}
|
|
|
|
seq_puts(m, ":vals=");
|
|
|
|
for_each_hist_val_field(i, hist_data) {
|
|
if (i == HITCOUNT_IDX)
|
|
seq_puts(m, "hitcount");
|
|
else {
|
|
seq_puts(m, ",");
|
|
hist_field_print(m, hist_data->fields[i]);
|
|
}
|
|
}
|
|
|
|
seq_puts(m, ":sort=");
|
|
|
|
for (i = 0; i < hist_data->n_sort_keys; i++) {
|
|
struct tracing_map_sort_key *sort_key;
|
|
|
|
sort_key = &hist_data->sort_keys[i];
|
|
|
|
if (i > 0)
|
|
seq_puts(m, ",");
|
|
|
|
if (sort_key->field_idx == HITCOUNT_IDX)
|
|
seq_puts(m, "hitcount");
|
|
else {
|
|
unsigned int idx = sort_key->field_idx;
|
|
|
|
if (WARN_ON(idx >= TRACING_MAP_FIELDS_MAX))
|
|
return -EINVAL;
|
|
|
|
hist_field_print(m, hist_data->fields[idx]);
|
|
}
|
|
|
|
if (sort_key->descending)
|
|
seq_puts(m, ".descending");
|
|
}
|
|
|
|
seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
|
|
|
|
if (data->filter_str)
|
|
seq_printf(m, " if %s", data->filter_str);
|
|
|
|
if (data->paused)
|
|
seq_puts(m, " [paused]");
|
|
else
|
|
seq_puts(m, " [active]");
|
|
|
|
seq_putc(m, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int event_hist_trigger_init(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
|
|
if (!data->ref && hist_data->attrs->name)
|
|
save_named_trigger(hist_data->attrs->name, data);
|
|
|
|
data->ref++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void event_hist_trigger_free(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
|
|
if (WARN_ON_ONCE(data->ref <= 0))
|
|
return;
|
|
|
|
data->ref--;
|
|
if (!data->ref) {
|
|
if (data->name)
|
|
del_named_trigger(data);
|
|
trigger_data_free(data);
|
|
destroy_hist_data(hist_data);
|
|
}
|
|
}
|
|
|
|
static struct event_trigger_ops event_hist_trigger_ops = {
|
|
.func = event_hist_trigger,
|
|
.print = event_hist_trigger_print,
|
|
.init = event_hist_trigger_init,
|
|
.free = event_hist_trigger_free,
|
|
};
|
|
|
|
static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
data->ref++;
|
|
|
|
save_named_trigger(data->named_data->name, data);
|
|
|
|
event_hist_trigger_init(ops, data->named_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data)
|
|
{
|
|
if (WARN_ON_ONCE(data->ref <= 0))
|
|
return;
|
|
|
|
event_hist_trigger_free(ops, data->named_data);
|
|
|
|
data->ref--;
|
|
if (!data->ref) {
|
|
del_named_trigger(data);
|
|
trigger_data_free(data);
|
|
}
|
|
}
|
|
|
|
static struct event_trigger_ops event_hist_trigger_named_ops = {
|
|
.func = event_hist_trigger,
|
|
.print = event_hist_trigger_print,
|
|
.init = event_hist_trigger_named_init,
|
|
.free = event_hist_trigger_named_free,
|
|
};
|
|
|
|
static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
|
|
char *param)
|
|
{
|
|
return &event_hist_trigger_ops;
|
|
}
|
|
|
|
static void hist_clear(struct event_trigger_data *data)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
|
|
if (data->name)
|
|
pause_named_trigger(data);
|
|
|
|
synchronize_sched();
|
|
|
|
tracing_map_clear(hist_data->map);
|
|
|
|
if (data->name)
|
|
unpause_named_trigger(data);
|
|
}
|
|
|
|
static bool compatible_field(struct ftrace_event_field *field,
|
|
struct ftrace_event_field *test_field)
|
|
{
|
|
if (field == test_field)
|
|
return true;
|
|
if (field == NULL || test_field == NULL)
|
|
return false;
|
|
if (strcmp(field->name, test_field->name) != 0)
|
|
return false;
|
|
if (strcmp(field->type, test_field->type) != 0)
|
|
return false;
|
|
if (field->size != test_field->size)
|
|
return false;
|
|
if (field->is_signed != test_field->is_signed)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool hist_trigger_match(struct event_trigger_data *data,
|
|
struct event_trigger_data *data_test,
|
|
struct event_trigger_data *named_data,
|
|
bool ignore_filter)
|
|
{
|
|
struct tracing_map_sort_key *sort_key, *sort_key_test;
|
|
struct hist_trigger_data *hist_data, *hist_data_test;
|
|
struct hist_field *key_field, *key_field_test;
|
|
unsigned int i;
|
|
|
|
if (named_data && (named_data != data_test) &&
|
|
(named_data != data_test->named_data))
|
|
return false;
|
|
|
|
if (!named_data && is_named_trigger(data_test))
|
|
return false;
|
|
|
|
hist_data = data->private_data;
|
|
hist_data_test = data_test->private_data;
|
|
|
|
if (hist_data->n_vals != hist_data_test->n_vals ||
|
|
hist_data->n_fields != hist_data_test->n_fields ||
|
|
hist_data->n_sort_keys != hist_data_test->n_sort_keys)
|
|
return false;
|
|
|
|
if (!ignore_filter) {
|
|
if ((data->filter_str && !data_test->filter_str) ||
|
|
(!data->filter_str && data_test->filter_str))
|
|
return false;
|
|
}
|
|
|
|
for_each_hist_field(i, hist_data) {
|
|
key_field = hist_data->fields[i];
|
|
key_field_test = hist_data_test->fields[i];
|
|
|
|
if (key_field->flags != key_field_test->flags)
|
|
return false;
|
|
if (!compatible_field(key_field->field, key_field_test->field))
|
|
return false;
|
|
if (key_field->offset != key_field_test->offset)
|
|
return false;
|
|
}
|
|
|
|
for (i = 0; i < hist_data->n_sort_keys; i++) {
|
|
sort_key = &hist_data->sort_keys[i];
|
|
sort_key_test = &hist_data_test->sort_keys[i];
|
|
|
|
if (sort_key->field_idx != sort_key_test->field_idx ||
|
|
sort_key->descending != sort_key_test->descending)
|
|
return false;
|
|
}
|
|
|
|
if (!ignore_filter && data->filter_str &&
|
|
(strcmp(data->filter_str, data_test->filter_str) != 0))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
struct event_trigger_data *test, *named_data = NULL;
|
|
int ret = 0;
|
|
|
|
if (hist_data->attrs->name) {
|
|
named_data = find_named_trigger(hist_data->attrs->name);
|
|
if (named_data) {
|
|
if (!hist_trigger_match(data, named_data, named_data,
|
|
true)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (hist_data->attrs->name && !named_data)
|
|
goto new;
|
|
|
|
list_for_each_entry_rcu(test, &file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
|
if (!hist_trigger_match(data, test, named_data, false))
|
|
continue;
|
|
if (hist_data->attrs->pause)
|
|
test->paused = true;
|
|
else if (hist_data->attrs->cont)
|
|
test->paused = false;
|
|
else if (hist_data->attrs->clear)
|
|
hist_clear(test);
|
|
else
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
new:
|
|
if (hist_data->attrs->cont || hist_data->attrs->clear) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (hist_data->attrs->pause)
|
|
data->paused = true;
|
|
|
|
if (named_data) {
|
|
destroy_hist_data(data->private_data);
|
|
data->private_data = named_data->private_data;
|
|
set_named_trigger_data(data, named_data);
|
|
data->ops = &event_hist_trigger_named_ops;
|
|
}
|
|
|
|
if (data->ops->init) {
|
|
ret = data->ops->init(data->ops, data);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
list_add_rcu(&data->list, &file->triggers);
|
|
ret++;
|
|
|
|
update_cond_flag(file);
|
|
|
|
if (trace_event_trigger_enable_disable(file, 1) < 0) {
|
|
list_del_rcu(&data->list);
|
|
update_cond_flag(file);
|
|
ret--;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
|
|
struct event_trigger_data *data,
|
|
struct trace_event_file *file)
|
|
{
|
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
struct event_trigger_data *test, *named_data = NULL;
|
|
bool unregistered = false;
|
|
|
|
if (hist_data->attrs->name)
|
|
named_data = find_named_trigger(hist_data->attrs->name);
|
|
|
|
list_for_each_entry_rcu(test, &file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
|
if (!hist_trigger_match(data, test, named_data, false))
|
|
continue;
|
|
unregistered = true;
|
|
list_del_rcu(&test->list);
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
update_cond_flag(file);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (unregistered && test->ops->free)
|
|
test->ops->free(test->ops, test);
|
|
}
|
|
|
|
static void hist_unreg_all(struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *test, *n;
|
|
|
|
list_for_each_entry_safe(test, n, &file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
|
list_del_rcu(&test->list);
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
update_cond_flag(file);
|
|
if (test->ops->free)
|
|
test->ops->free(test->ops, test);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int event_hist_trigger_func(struct event_command *cmd_ops,
|
|
struct trace_event_file *file,
|
|
char *glob, char *cmd, char *param)
|
|
{
|
|
unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
|
|
struct event_trigger_data *trigger_data;
|
|
struct hist_trigger_attrs *attrs;
|
|
struct event_trigger_ops *trigger_ops;
|
|
struct hist_trigger_data *hist_data;
|
|
char *trigger;
|
|
int ret = 0;
|
|
|
|
if (!param)
|
|
return -EINVAL;
|
|
|
|
/* separate the trigger from the filter (k:v [if filter]) */
|
|
trigger = strsep(¶m, " \t");
|
|
if (!trigger)
|
|
return -EINVAL;
|
|
|
|
attrs = parse_hist_trigger_attrs(trigger);
|
|
if (IS_ERR(attrs))
|
|
return PTR_ERR(attrs);
|
|
|
|
if (attrs->map_bits)
|
|
hist_trigger_bits = attrs->map_bits;
|
|
|
|
hist_data = create_hist_data(hist_trigger_bits, attrs, file);
|
|
if (IS_ERR(hist_data)) {
|
|
destroy_hist_trigger_attrs(attrs);
|
|
return PTR_ERR(hist_data);
|
|
}
|
|
|
|
trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
|
|
|
|
ret = -ENOMEM;
|
|
trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
|
|
if (!trigger_data)
|
|
goto out_free;
|
|
|
|
trigger_data->count = -1;
|
|
trigger_data->ops = trigger_ops;
|
|
trigger_data->cmd_ops = cmd_ops;
|
|
|
|
INIT_LIST_HEAD(&trigger_data->list);
|
|
RCU_INIT_POINTER(trigger_data->filter, NULL);
|
|
|
|
trigger_data->private_data = hist_data;
|
|
|
|
/* if param is non-empty, it's supposed to be a filter */
|
|
if (param && cmd_ops->set_filter) {
|
|
ret = cmd_ops->set_filter(param, trigger_data, file);
|
|
if (ret < 0)
|
|
goto out_free;
|
|
}
|
|
|
|
if (glob[0] == '!') {
|
|
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
|
|
ret = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
|
|
/*
|
|
* The above returns on success the # of triggers registered,
|
|
* but if it didn't register any it returns zero. Consider no
|
|
* triggers registered a failure too.
|
|
*/
|
|
if (!ret) {
|
|
if (!(attrs->pause || attrs->cont || attrs->clear))
|
|
ret = -ENOENT;
|
|
goto out_free;
|
|
} else if (ret < 0)
|
|
goto out_free;
|
|
/* Just return zero, not the number of registered triggers */
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
out_free:
|
|
if (cmd_ops->set_filter)
|
|
cmd_ops->set_filter(NULL, trigger_data, NULL);
|
|
|
|
kfree(trigger_data);
|
|
|
|
destroy_hist_data(hist_data);
|
|
goto out;
|
|
}
|
|
|
|
static struct event_command trigger_hist_cmd = {
|
|
.name = "hist",
|
|
.trigger_type = ETT_EVENT_HIST,
|
|
.flags = EVENT_CMD_FL_NEEDS_REC,
|
|
.func = event_hist_trigger_func,
|
|
.reg = hist_register_trigger,
|
|
.unreg = hist_unregister_trigger,
|
|
.unreg_all = hist_unreg_all,
|
|
.get_trigger_ops = event_hist_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
__init int register_trigger_hist_cmd(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_hist_cmd);
|
|
WARN_ON(ret < 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
hist_enable_trigger(struct event_trigger_data *data, void *rec)
|
|
{
|
|
struct enable_trigger_data *enable_data = data->private_data;
|
|
struct event_trigger_data *test;
|
|
|
|
list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
|
if (enable_data->enable)
|
|
test->paused = false;
|
|
else
|
|
test->paused = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
hist_enable_count_trigger(struct event_trigger_data *data, void *rec)
|
|
{
|
|
if (!data->count)
|
|
return;
|
|
|
|
if (data->count != -1)
|
|
(data->count)--;
|
|
|
|
hist_enable_trigger(data, rec);
|
|
}
|
|
|
|
static struct event_trigger_ops hist_enable_trigger_ops = {
|
|
.func = hist_enable_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops hist_enable_count_trigger_ops = {
|
|
.func = hist_enable_count_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops hist_disable_trigger_ops = {
|
|
.func = hist_enable_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops hist_disable_count_trigger_ops = {
|
|
.func = hist_enable_count_trigger,
|
|
.print = event_enable_trigger_print,
|
|
.init = event_trigger_init,
|
|
.free = event_enable_trigger_free,
|
|
};
|
|
|
|
static struct event_trigger_ops *
|
|
hist_enable_get_trigger_ops(char *cmd, char *param)
|
|
{
|
|
struct event_trigger_ops *ops;
|
|
bool enable;
|
|
|
|
enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
|
|
|
|
if (enable)
|
|
ops = param ? &hist_enable_count_trigger_ops :
|
|
&hist_enable_trigger_ops;
|
|
else
|
|
ops = param ? &hist_disable_count_trigger_ops :
|
|
&hist_disable_trigger_ops;
|
|
|
|
return ops;
|
|
}
|
|
|
|
static void hist_enable_unreg_all(struct trace_event_file *file)
|
|
{
|
|
struct event_trigger_data *test, *n;
|
|
|
|
list_for_each_entry_safe(test, n, &file->triggers, list) {
|
|
if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
|
|
list_del_rcu(&test->list);
|
|
update_cond_flag(file);
|
|
trace_event_trigger_enable_disable(file, 0);
|
|
if (test->ops->free)
|
|
test->ops->free(test->ops, test);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct event_command trigger_hist_enable_cmd = {
|
|
.name = ENABLE_HIST_STR,
|
|
.trigger_type = ETT_HIST_ENABLE,
|
|
.func = event_enable_trigger_func,
|
|
.reg = event_enable_register_trigger,
|
|
.unreg = event_enable_unregister_trigger,
|
|
.unreg_all = hist_enable_unreg_all,
|
|
.get_trigger_ops = hist_enable_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static struct event_command trigger_hist_disable_cmd = {
|
|
.name = DISABLE_HIST_STR,
|
|
.trigger_type = ETT_HIST_ENABLE,
|
|
.func = event_enable_trigger_func,
|
|
.reg = event_enable_register_trigger,
|
|
.unreg = event_enable_unregister_trigger,
|
|
.unreg_all = hist_enable_unreg_all,
|
|
.get_trigger_ops = hist_enable_get_trigger_ops,
|
|
.set_filter = set_trigger_filter,
|
|
};
|
|
|
|
static __init void unregister_trigger_hist_enable_disable_cmds(void)
|
|
{
|
|
unregister_event_command(&trigger_hist_enable_cmd);
|
|
unregister_event_command(&trigger_hist_disable_cmd);
|
|
}
|
|
|
|
__init int register_trigger_hist_enable_disable_cmds(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_event_command(&trigger_hist_enable_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
return ret;
|
|
ret = register_event_command(&trigger_hist_disable_cmd);
|
|
if (WARN_ON(ret < 0))
|
|
unregister_trigger_hist_enable_disable_cmds();
|
|
|
|
return ret;
|
|
}
|