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- // SPDX-License-Identifier: GPL-2.0
- /*
- * trace_events_hist - trace event hist triggers
- *
- * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
- */
- #include <linux/module.h>
- #include <linux/kallsyms.h>
- #include <linux/mutex.h>
- #include <linux/slab.h>
- #include <linux/stacktrace.h>
- #include <linux/rculist.h>
- #include <linux/tracefs.h>
- #include "tracing_map.h"
- #include "trace.h"
- #define SYNTH_SYSTEM "synthetic"
- #define SYNTH_FIELDS_MAX 16
- #define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
- struct hist_field;
- typedef u64 (*hist_field_fn_t) (struct hist_field *field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event);
- #define HIST_FIELD_OPERANDS_MAX 2
- #define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
- #define HIST_ACTIONS_MAX 8
- enum field_op_id {
- FIELD_OP_NONE,
- FIELD_OP_PLUS,
- FIELD_OP_MINUS,
- FIELD_OP_UNARY_MINUS,
- };
- struct hist_var {
- char *name;
- struct hist_trigger_data *hist_data;
- unsigned int idx;
- };
- struct hist_field {
- struct ftrace_event_field *field;
- unsigned long flags;
- hist_field_fn_t fn;
- unsigned int ref;
- unsigned int size;
- unsigned int offset;
- unsigned int is_signed;
- const char *type;
- struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
- struct hist_trigger_data *hist_data;
- struct hist_var var;
- enum field_op_id operator;
- char *system;
- char *event_name;
- char *name;
- unsigned int var_idx;
- unsigned int var_ref_idx;
- bool read_once;
- };
- static u64 hist_field_none(struct hist_field *field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- return 0;
- }
- static u64 hist_field_counter(struct hist_field *field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- return 1;
- }
- static u64 hist_field_string(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- char *addr = (char *)(event + hist_field->field->offset);
- return (u64)(unsigned long)addr;
- }
- static u64 hist_field_dynstring(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- u32 str_item = *(u32 *)(event + hist_field->field->offset);
- int str_loc = str_item & 0xffff;
- char *addr = (char *)(event + str_loc);
- return (u64)(unsigned long)addr;
- }
- static u64 hist_field_pstring(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- char **addr = (char **)(event + hist_field->field->offset);
- return (u64)(unsigned long)*addr;
- }
- static u64 hist_field_log2(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_field *operand = hist_field->operands[0];
- u64 val = operand->fn(operand, elt, rbe, event);
- return (u64) ilog2(roundup_pow_of_two(val));
- }
- static u64 hist_field_plus(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_field *operand1 = hist_field->operands[0];
- struct hist_field *operand2 = hist_field->operands[1];
- u64 val1 = operand1->fn(operand1, elt, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, rbe, event);
- return val1 + val2;
- }
- static u64 hist_field_minus(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_field *operand1 = hist_field->operands[0];
- struct hist_field *operand2 = hist_field->operands[1];
- u64 val1 = operand1->fn(operand1, elt, rbe, event);
- u64 val2 = operand2->fn(operand2, elt, rbe, event);
- return val1 - val2;
- }
- static u64 hist_field_unary_minus(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_field *operand = hist_field->operands[0];
- s64 sval = (s64)operand->fn(operand, elt, rbe, event);
- u64 val = (u64)-sval;
- return val;
- }
- #define DEFINE_HIST_FIELD_FN(type) \
- static u64 hist_field_##type(struct hist_field *hist_field, \
- struct tracing_map_elt *elt, \
- struct ring_buffer_event *rbe, \
- void *event) \
- { \
- type *addr = (type *)(event + hist_field->field->offset); \
- \
- return (u64)(unsigned long)*addr; \
- }
- DEFINE_HIST_FIELD_FN(s64);
- DEFINE_HIST_FIELD_FN(u64);
- DEFINE_HIST_FIELD_FN(s32);
- DEFINE_HIST_FIELD_FN(u32);
- DEFINE_HIST_FIELD_FN(s16);
- DEFINE_HIST_FIELD_FN(u16);
- DEFINE_HIST_FIELD_FN(s8);
- DEFINE_HIST_FIELD_FN(u8);
- #define for_each_hist_field(i, hist_data) \
- for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
- #define for_each_hist_val_field(i, hist_data) \
- for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
- #define for_each_hist_key_field(i, hist_data) \
- for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
- #define HIST_STACKTRACE_DEPTH 16
- #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
- #define HIST_STACKTRACE_SKIP 5
- #define HITCOUNT_IDX 0
- #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
- enum hist_field_flags {
- HIST_FIELD_FL_HITCOUNT = 1 << 0,
- HIST_FIELD_FL_KEY = 1 << 1,
- HIST_FIELD_FL_STRING = 1 << 2,
- HIST_FIELD_FL_HEX = 1 << 3,
- HIST_FIELD_FL_SYM = 1 << 4,
- HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
- HIST_FIELD_FL_EXECNAME = 1 << 6,
- HIST_FIELD_FL_SYSCALL = 1 << 7,
- HIST_FIELD_FL_STACKTRACE = 1 << 8,
- HIST_FIELD_FL_LOG2 = 1 << 9,
- HIST_FIELD_FL_TIMESTAMP = 1 << 10,
- HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
- HIST_FIELD_FL_VAR = 1 << 12,
- HIST_FIELD_FL_EXPR = 1 << 13,
- HIST_FIELD_FL_VAR_REF = 1 << 14,
- HIST_FIELD_FL_CPU = 1 << 15,
- HIST_FIELD_FL_ALIAS = 1 << 16,
- };
- struct var_defs {
- unsigned int n_vars;
- char *name[TRACING_MAP_VARS_MAX];
- char *expr[TRACING_MAP_VARS_MAX];
- };
- struct hist_trigger_attrs {
- char *keys_str;
- char *vals_str;
- char *sort_key_str;
- char *name;
- char *clock;
- bool pause;
- bool cont;
- bool clear;
- bool ts_in_usecs;
- unsigned int map_bits;
- char *assignment_str[TRACING_MAP_VARS_MAX];
- unsigned int n_assignments;
- char *action_str[HIST_ACTIONS_MAX];
- unsigned int n_actions;
- struct var_defs var_defs;
- };
- struct field_var {
- struct hist_field *var;
- struct hist_field *val;
- };
- struct field_var_hist {
- struct hist_trigger_data *hist_data;
- char *cmd;
- };
- struct hist_trigger_data {
- struct hist_field *fields[HIST_FIELDS_MAX];
- unsigned int n_vals;
- unsigned int n_keys;
- unsigned int n_fields;
- unsigned int n_vars;
- unsigned int key_size;
- struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
- unsigned int n_sort_keys;
- struct trace_event_file *event_file;
- struct hist_trigger_attrs *attrs;
- struct tracing_map *map;
- bool enable_timestamps;
- bool remove;
- struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
- unsigned int n_var_refs;
- struct action_data *actions[HIST_ACTIONS_MAX];
- unsigned int n_actions;
- struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX];
- unsigned int n_synth_var_refs;
- struct field_var *field_vars[SYNTH_FIELDS_MAX];
- unsigned int n_field_vars;
- unsigned int n_field_var_str;
- struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
- unsigned int n_field_var_hists;
- struct field_var *max_vars[SYNTH_FIELDS_MAX];
- unsigned int n_max_vars;
- unsigned int n_max_var_str;
- };
- struct synth_field {
- char *type;
- char *name;
- size_t size;
- bool is_signed;
- bool is_string;
- };
- struct synth_event {
- struct list_head list;
- int ref;
- char *name;
- struct synth_field **fields;
- unsigned int n_fields;
- unsigned int n_u64;
- struct trace_event_class class;
- struct trace_event_call call;
- struct tracepoint *tp;
- };
- struct action_data;
- typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
- struct action_data *data, u64 *var_ref_vals);
- struct action_data {
- action_fn_t fn;
- unsigned int n_params;
- char *params[SYNTH_FIELDS_MAX];
- union {
- struct {
- unsigned int var_ref_idx;
- char *match_event;
- char *match_event_system;
- char *synth_event_name;
- struct synth_event *synth_event;
- } onmatch;
- struct {
- char *var_str;
- char *fn_name;
- unsigned int max_var_ref_idx;
- struct hist_field *max_var;
- struct hist_field *var;
- } onmax;
- };
- };
- static char last_hist_cmd[MAX_FILTER_STR_VAL];
- static char hist_err_str[MAX_FILTER_STR_VAL];
- static void last_cmd_set(char *str)
- {
- if (!str)
- return;
- strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
- }
- static void hist_err(char *str, char *var)
- {
- int maxlen = MAX_FILTER_STR_VAL - 1;
- if (!str)
- return;
- if (strlen(hist_err_str))
- return;
- if (!var)
- var = "";
- if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
- return;
- strcat(hist_err_str, str);
- strcat(hist_err_str, var);
- }
- static void hist_err_event(char *str, char *system, char *event, char *var)
- {
- char err[MAX_FILTER_STR_VAL];
- if (system && var)
- snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var);
- else if (system)
- snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
- else
- strscpy(err, var, MAX_FILTER_STR_VAL);
- hist_err(str, err);
- }
- static void hist_err_clear(void)
- {
- hist_err_str[0] = '\0';
- }
- static bool have_hist_err(void)
- {
- if (strlen(hist_err_str))
- return true;
- return false;
- }
- static LIST_HEAD(synth_event_list);
- static DEFINE_MUTEX(synth_event_mutex);
- struct synth_trace_event {
- struct trace_entry ent;
- u64 fields[];
- };
- static int synth_event_define_fields(struct trace_event_call *call)
- {
- struct synth_trace_event trace;
- int offset = offsetof(typeof(trace), fields);
- struct synth_event *event = call->data;
- unsigned int i, size, n_u64;
- char *name, *type;
- bool is_signed;
- int ret = 0;
- for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
- size = event->fields[i]->size;
- is_signed = event->fields[i]->is_signed;
- type = event->fields[i]->type;
- name = event->fields[i]->name;
- ret = trace_define_field(call, type, name, offset, size,
- is_signed, FILTER_OTHER);
- if (ret)
- break;
- if (event->fields[i]->is_string) {
- offset += STR_VAR_LEN_MAX;
- n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
- } else {
- offset += sizeof(u64);
- n_u64++;
- }
- }
- event->n_u64 = n_u64;
- return ret;
- }
- static bool synth_field_signed(char *type)
- {
- if (strncmp(type, "u", 1) == 0)
- return false;
- if (strcmp(type, "gfp_t") == 0)
- return false;
- return true;
- }
- static int synth_field_is_string(char *type)
- {
- if (strstr(type, "char[") != NULL)
- return true;
- return false;
- }
- static int synth_field_string_size(char *type)
- {
- char buf[4], *end, *start;
- unsigned int len;
- int size, err;
- start = strstr(type, "char[");
- if (start == NULL)
- return -EINVAL;
- start += strlen("char[");
- end = strchr(type, ']');
- if (!end || end < start)
- return -EINVAL;
- len = end - start;
- if (len > 3)
- return -EINVAL;
- strncpy(buf, start, len);
- buf[len] = '\0';
- err = kstrtouint(buf, 0, &size);
- if (err)
- return err;
- if (size > STR_VAR_LEN_MAX)
- return -EINVAL;
- return size;
- }
- static int synth_field_size(char *type)
- {
- int size = 0;
- if (strcmp(type, "s64") == 0)
- size = sizeof(s64);
- else if (strcmp(type, "u64") == 0)
- size = sizeof(u64);
- else if (strcmp(type, "s32") == 0)
- size = sizeof(s32);
- else if (strcmp(type, "u32") == 0)
- size = sizeof(u32);
- else if (strcmp(type, "s16") == 0)
- size = sizeof(s16);
- else if (strcmp(type, "u16") == 0)
- size = sizeof(u16);
- else if (strcmp(type, "s8") == 0)
- size = sizeof(s8);
- else if (strcmp(type, "u8") == 0)
- size = sizeof(u8);
- else if (strcmp(type, "char") == 0)
- size = sizeof(char);
- else if (strcmp(type, "unsigned char") == 0)
- size = sizeof(unsigned char);
- else if (strcmp(type, "int") == 0)
- size = sizeof(int);
- else if (strcmp(type, "unsigned int") == 0)
- size = sizeof(unsigned int);
- else if (strcmp(type, "long") == 0)
- size = sizeof(long);
- else if (strcmp(type, "unsigned long") == 0)
- size = sizeof(unsigned long);
- else if (strcmp(type, "pid_t") == 0)
- size = sizeof(pid_t);
- else if (synth_field_is_string(type))
- size = synth_field_string_size(type);
- return size;
- }
- static const char *synth_field_fmt(char *type)
- {
- const char *fmt = "%llu";
- if (strcmp(type, "s64") == 0)
- fmt = "%lld";
- else if (strcmp(type, "u64") == 0)
- fmt = "%llu";
- else if (strcmp(type, "s32") == 0)
- fmt = "%d";
- else if (strcmp(type, "u32") == 0)
- fmt = "%u";
- else if (strcmp(type, "s16") == 0)
- fmt = "%d";
- else if (strcmp(type, "u16") == 0)
- fmt = "%u";
- else if (strcmp(type, "s8") == 0)
- fmt = "%d";
- else if (strcmp(type, "u8") == 0)
- fmt = "%u";
- else if (strcmp(type, "char") == 0)
- fmt = "%d";
- else if (strcmp(type, "unsigned char") == 0)
- fmt = "%u";
- else if (strcmp(type, "int") == 0)
- fmt = "%d";
- else if (strcmp(type, "unsigned int") == 0)
- fmt = "%u";
- else if (strcmp(type, "long") == 0)
- fmt = "%ld";
- else if (strcmp(type, "unsigned long") == 0)
- fmt = "%lu";
- else if (strcmp(type, "pid_t") == 0)
- fmt = "%d";
- else if (synth_field_is_string(type))
- fmt = "%s";
- return fmt;
- }
- static enum print_line_t print_synth_event(struct trace_iterator *iter,
- int flags,
- struct trace_event *event)
- {
- struct trace_array *tr = iter->tr;
- struct trace_seq *s = &iter->seq;
- struct synth_trace_event *entry;
- struct synth_event *se;
- unsigned int i, n_u64;
- char print_fmt[32];
- const char *fmt;
- entry = (struct synth_trace_event *)iter->ent;
- se = container_of(event, struct synth_event, call.event);
- trace_seq_printf(s, "%s: ", se->name);
- for (i = 0, n_u64 = 0; i < se->n_fields; i++) {
- if (trace_seq_has_overflowed(s))
- goto end;
- fmt = synth_field_fmt(se->fields[i]->type);
- /* parameter types */
- if (tr->trace_flags & TRACE_ITER_VERBOSE)
- trace_seq_printf(s, "%s ", fmt);
- snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt);
- /* parameter values */
- if (se->fields[i]->is_string) {
- trace_seq_printf(s, print_fmt, se->fields[i]->name,
- (char *)&entry->fields[n_u64],
- i == se->n_fields - 1 ? "" : " ");
- n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
- } else {
- trace_seq_printf(s, print_fmt, se->fields[i]->name,
- entry->fields[n_u64],
- i == se->n_fields - 1 ? "" : " ");
- n_u64++;
- }
- }
- end:
- trace_seq_putc(s, '\n');
- return trace_handle_return(s);
- }
- static struct trace_event_functions synth_event_funcs = {
- .trace = print_synth_event
- };
- static notrace void trace_event_raw_event_synth(void *__data,
- u64 *var_ref_vals,
- unsigned int var_ref_idx)
- {
- struct trace_event_file *trace_file = __data;
- struct synth_trace_event *entry;
- struct trace_event_buffer fbuffer;
- struct ring_buffer *buffer;
- struct synth_event *event;
- unsigned int i, n_u64;
- int fields_size = 0;
- event = trace_file->event_call->data;
- if (trace_trigger_soft_disabled(trace_file))
- return;
- fields_size = event->n_u64 * sizeof(u64);
- /*
- * Avoid ring buffer recursion detection, as this event
- * is being performed within another event.
- */
- buffer = trace_file->tr->trace_buffer.buffer;
- ring_buffer_nest_start(buffer);
- entry = trace_event_buffer_reserve(&fbuffer, trace_file,
- sizeof(*entry) + fields_size);
- if (!entry)
- goto out;
- for (i = 0, n_u64 = 0; i < event->n_fields; i++) {
- if (event->fields[i]->is_string) {
- char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i];
- char *str_field = (char *)&entry->fields[n_u64];
- strscpy(str_field, str_val, STR_VAR_LEN_MAX);
- n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
- } else {
- struct synth_field *field = event->fields[i];
- u64 val = var_ref_vals[var_ref_idx + i];
- switch (field->size) {
- case 1:
- *(u8 *)&entry->fields[n_u64] = (u8)val;
- break;
- case 2:
- *(u16 *)&entry->fields[n_u64] = (u16)val;
- break;
- case 4:
- *(u32 *)&entry->fields[n_u64] = (u32)val;
- break;
- default:
- entry->fields[n_u64] = val;
- break;
- }
- n_u64++;
- }
- }
- trace_event_buffer_commit(&fbuffer);
- out:
- ring_buffer_nest_end(buffer);
- }
- static void free_synth_event_print_fmt(struct trace_event_call *call)
- {
- if (call) {
- kfree(call->print_fmt);
- call->print_fmt = NULL;
- }
- }
- static int __set_synth_event_print_fmt(struct synth_event *event,
- char *buf, int len)
- {
- const char *fmt;
- int pos = 0;
- int i;
- /* When len=0, we just calculate the needed length */
- #define LEN_OR_ZERO (len ? len - pos : 0)
- pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
- for (i = 0; i < event->n_fields; i++) {
- fmt = synth_field_fmt(event->fields[i]->type);
- pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s",
- event->fields[i]->name, fmt,
- i == event->n_fields - 1 ? "" : ", ");
- }
- pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
- for (i = 0; i < event->n_fields; i++) {
- pos += snprintf(buf + pos, LEN_OR_ZERO,
- ", REC->%s", event->fields[i]->name);
- }
- #undef LEN_OR_ZERO
- /* return the length of print_fmt */
- return pos;
- }
- static int set_synth_event_print_fmt(struct trace_event_call *call)
- {
- struct synth_event *event = call->data;
- char *print_fmt;
- int len;
- /* First: called with 0 length to calculate the needed length */
- len = __set_synth_event_print_fmt(event, NULL, 0);
- print_fmt = kmalloc(len + 1, GFP_KERNEL);
- if (!print_fmt)
- return -ENOMEM;
- /* Second: actually write the @print_fmt */
- __set_synth_event_print_fmt(event, print_fmt, len + 1);
- call->print_fmt = print_fmt;
- return 0;
- }
- static void free_synth_field(struct synth_field *field)
- {
- kfree(field->type);
- kfree(field->name);
- kfree(field);
- }
- static struct synth_field *parse_synth_field(int argc, char **argv,
- int *consumed)
- {
- struct synth_field *field;
- const char *prefix = NULL;
- char *field_type = argv[0], *field_name;
- int len, ret = 0;
- char *array;
- if (field_type[0] == ';')
- field_type++;
- if (!strcmp(field_type, "unsigned")) {
- if (argc < 3)
- return ERR_PTR(-EINVAL);
- prefix = "unsigned ";
- field_type = argv[1];
- field_name = argv[2];
- *consumed = 3;
- } else {
- field_name = argv[1];
- *consumed = 2;
- }
- len = strlen(field_name);
- if (field_name[len - 1] == ';')
- field_name[len - 1] = '\0';
- field = kzalloc(sizeof(*field), GFP_KERNEL);
- if (!field)
- return ERR_PTR(-ENOMEM);
- len = strlen(field_type) + 1;
- array = strchr(field_name, '[');
- if (array)
- len += strlen(array);
- if (prefix)
- len += strlen(prefix);
- field->type = kzalloc(len, GFP_KERNEL);
- if (!field->type) {
- ret = -ENOMEM;
- goto free;
- }
- if (prefix)
- strcat(field->type, prefix);
- strcat(field->type, field_type);
- if (array) {
- strcat(field->type, array);
- *array = '\0';
- }
- field->size = synth_field_size(field->type);
- if (!field->size) {
- ret = -EINVAL;
- goto free;
- }
- if (synth_field_is_string(field->type))
- field->is_string = true;
- field->is_signed = synth_field_signed(field->type);
- field->name = kstrdup(field_name, GFP_KERNEL);
- if (!field->name) {
- ret = -ENOMEM;
- goto free;
- }
- out:
- return field;
- free:
- free_synth_field(field);
- field = ERR_PTR(ret);
- goto out;
- }
- static void free_synth_tracepoint(struct tracepoint *tp)
- {
- if (!tp)
- return;
- kfree(tp->name);
- kfree(tp);
- }
- static struct tracepoint *alloc_synth_tracepoint(char *name)
- {
- struct tracepoint *tp;
- tp = kzalloc(sizeof(*tp), GFP_KERNEL);
- if (!tp)
- return ERR_PTR(-ENOMEM);
- tp->name = kstrdup(name, GFP_KERNEL);
- if (!tp->name) {
- kfree(tp);
- return ERR_PTR(-ENOMEM);
- }
- return tp;
- }
- typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
- unsigned int var_ref_idx);
- static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
- unsigned int var_ref_idx)
- {
- struct tracepoint *tp = event->tp;
- if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
- struct tracepoint_func *probe_func_ptr;
- synth_probe_func_t probe_func;
- void *__data;
- if (!(cpu_online(raw_smp_processor_id())))
- return;
- probe_func_ptr = rcu_dereference_sched((tp)->funcs);
- if (probe_func_ptr) {
- do {
- probe_func = probe_func_ptr->func;
- __data = probe_func_ptr->data;
- probe_func(__data, var_ref_vals, var_ref_idx);
- } while ((++probe_func_ptr)->func);
- }
- }
- }
- static struct synth_event *find_synth_event(const char *name)
- {
- struct synth_event *event;
- list_for_each_entry(event, &synth_event_list, list) {
- if (strcmp(event->name, name) == 0)
- return event;
- }
- return NULL;
- }
- static int register_synth_event(struct synth_event *event)
- {
- struct trace_event_call *call = &event->call;
- int ret = 0;
- event->call.class = &event->class;
- event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL);
- if (!event->class.system) {
- ret = -ENOMEM;
- goto out;
- }
- event->tp = alloc_synth_tracepoint(event->name);
- if (IS_ERR(event->tp)) {
- ret = PTR_ERR(event->tp);
- event->tp = NULL;
- goto out;
- }
- INIT_LIST_HEAD(&call->class->fields);
- call->event.funcs = &synth_event_funcs;
- call->class->define_fields = synth_event_define_fields;
- ret = register_trace_event(&call->event);
- if (!ret) {
- ret = -ENODEV;
- goto out;
- }
- call->flags = TRACE_EVENT_FL_TRACEPOINT;
- call->class->reg = trace_event_reg;
- call->class->probe = trace_event_raw_event_synth;
- call->data = event;
- call->tp = event->tp;
- ret = trace_add_event_call_nolock(call);
- if (ret) {
- pr_warn("Failed to register synthetic event: %s\n",
- trace_event_name(call));
- goto err;
- }
- ret = set_synth_event_print_fmt(call);
- if (ret < 0) {
- trace_remove_event_call(call);
- goto err;
- }
- out:
- return ret;
- err:
- unregister_trace_event(&call->event);
- goto out;
- }
- static int unregister_synth_event(struct synth_event *event)
- {
- struct trace_event_call *call = &event->call;
- int ret;
- ret = trace_remove_event_call_nolock(call);
- return ret;
- }
- static void free_synth_event(struct synth_event *event)
- {
- unsigned int i;
- if (!event)
- return;
- for (i = 0; i < event->n_fields; i++)
- free_synth_field(event->fields[i]);
- kfree(event->fields);
- kfree(event->name);
- kfree(event->class.system);
- free_synth_tracepoint(event->tp);
- free_synth_event_print_fmt(&event->call);
- kfree(event);
- }
- static struct synth_event *alloc_synth_event(char *event_name, int n_fields,
- struct synth_field **fields)
- {
- struct synth_event *event;
- unsigned int i;
- event = kzalloc(sizeof(*event), GFP_KERNEL);
- if (!event) {
- event = ERR_PTR(-ENOMEM);
- goto out;
- }
- event->name = kstrdup(event_name, GFP_KERNEL);
- if (!event->name) {
- kfree(event);
- event = ERR_PTR(-ENOMEM);
- goto out;
- }
- event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL);
- if (!event->fields) {
- free_synth_event(event);
- event = ERR_PTR(-ENOMEM);
- goto out;
- }
- for (i = 0; i < n_fields; i++)
- event->fields[i] = fields[i];
- event->n_fields = n_fields;
- out:
- return event;
- }
- static void action_trace(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
- struct action_data *data, u64 *var_ref_vals)
- {
- struct synth_event *event = data->onmatch.synth_event;
- trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx);
- }
- struct hist_var_data {
- struct list_head list;
- struct hist_trigger_data *hist_data;
- };
- static void add_or_delete_synth_event(struct synth_event *event, int delete)
- {
- if (delete)
- free_synth_event(event);
- else {
- if (!find_synth_event(event->name))
- list_add(&event->list, &synth_event_list);
- else
- free_synth_event(event);
- }
- }
- static int create_synth_event(int argc, char **argv)
- {
- struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
- struct synth_event *event = NULL;
- bool delete_event = false;
- int i, consumed = 0, n_fields = 0, ret = 0;
- char *name;
- mutex_lock(&event_mutex);
- mutex_lock(&synth_event_mutex);
- /*
- * Argument syntax:
- * - Add synthetic event: <event_name> field[;field] ...
- * - Remove synthetic event: !<event_name> field[;field] ...
- * where 'field' = type field_name
- */
- if (argc < 1) {
- ret = -EINVAL;
- goto out;
- }
- name = argv[0];
- if (name[0] == '!') {
- delete_event = true;
- name++;
- }
- event = find_synth_event(name);
- if (event) {
- if (delete_event) {
- if (event->ref) {
- event = NULL;
- ret = -EBUSY;
- goto out;
- }
- list_del(&event->list);
- goto out;
- }
- event = NULL;
- ret = -EEXIST;
- goto out;
- } else if (delete_event) {
- ret = -ENOENT;
- goto out;
- }
- if (argc < 2) {
- ret = -EINVAL;
- goto out;
- }
- for (i = 1; i < argc - 1; i++) {
- if (strcmp(argv[i], ";") == 0)
- continue;
- if (n_fields == SYNTH_FIELDS_MAX) {
- ret = -EINVAL;
- goto err;
- }
- field = parse_synth_field(argc - i, &argv[i], &consumed);
- if (IS_ERR(field)) {
- ret = PTR_ERR(field);
- goto err;
- }
- fields[n_fields++] = field;
- i += consumed - 1;
- }
- if (i < argc && strcmp(argv[i], ";") != 0) {
- ret = -EINVAL;
- goto err;
- }
- event = alloc_synth_event(name, n_fields, fields);
- if (IS_ERR(event)) {
- ret = PTR_ERR(event);
- event = NULL;
- goto err;
- }
- out:
- if (event) {
- if (delete_event) {
- ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
- } else {
- ret = register_synth_event(event);
- add_or_delete_synth_event(event, ret);
- }
- }
- mutex_unlock(&synth_event_mutex);
- mutex_unlock(&event_mutex);
- return ret;
- err:
- mutex_unlock(&synth_event_mutex);
- mutex_unlock(&event_mutex);
- for (i = 0; i < n_fields; i++)
- free_synth_field(fields[i]);
- free_synth_event(event);
- return ret;
- }
- static int release_all_synth_events(void)
- {
- struct synth_event *event, *e;
- int ret = 0;
- mutex_lock(&event_mutex);
- mutex_lock(&synth_event_mutex);
- list_for_each_entry(event, &synth_event_list, list) {
- if (event->ref) {
- mutex_unlock(&synth_event_mutex);
- return -EBUSY;
- }
- }
- list_for_each_entry_safe(event, e, &synth_event_list, list) {
- list_del(&event->list);
- ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
- }
- mutex_unlock(&synth_event_mutex);
- mutex_unlock(&event_mutex);
- return ret;
- }
- static void *synth_events_seq_start(struct seq_file *m, loff_t *pos)
- {
- mutex_lock(&synth_event_mutex);
- return seq_list_start(&synth_event_list, *pos);
- }
- static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos)
- {
- return seq_list_next(v, &synth_event_list, pos);
- }
- static void synth_events_seq_stop(struct seq_file *m, void *v)
- {
- mutex_unlock(&synth_event_mutex);
- }
- static int synth_events_seq_show(struct seq_file *m, void *v)
- {
- struct synth_field *field;
- struct synth_event *event = v;
- unsigned int i;
- seq_printf(m, "%s\t", event->name);
- for (i = 0; i < event->n_fields; i++) {
- field = event->fields[i];
- /* parameter values */
- seq_printf(m, "%s %s%s", field->type, field->name,
- i == event->n_fields - 1 ? "" : "; ");
- }
- seq_putc(m, '\n');
- return 0;
- }
- static const struct seq_operations synth_events_seq_op = {
- .start = synth_events_seq_start,
- .next = synth_events_seq_next,
- .stop = synth_events_seq_stop,
- .show = synth_events_seq_show
- };
- static int synth_events_open(struct inode *inode, struct file *file)
- {
- int ret;
- if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
- ret = release_all_synth_events();
- if (ret < 0)
- return ret;
- }
- return seq_open(file, &synth_events_seq_op);
- }
- static ssize_t synth_events_write(struct file *file,
- const char __user *buffer,
- size_t count, loff_t *ppos)
- {
- return trace_parse_run_command(file, buffer, count, ppos,
- create_synth_event);
- }
- static const struct file_operations synth_events_fops = {
- .open = synth_events_open,
- .write = synth_events_write,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
- };
- static u64 hist_field_timestamp(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_trigger_data *hist_data = hist_field->hist_data;
- struct trace_array *tr = hist_data->event_file->tr;
- u64 ts = ring_buffer_event_time_stamp(rbe);
- if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
- ts = ns2usecs(ts);
- return ts;
- }
- static u64 hist_field_cpu(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- int cpu = smp_processor_id();
- return cpu;
- }
- /**
- * check_field_for_var_ref - Check if a VAR_REF field references a variable
- * @hist_field: The VAR_REF field to check
- * @var_data: The hist trigger that owns the variable
- * @var_idx: The trigger variable identifier
- *
- * Check the given VAR_REF field to see whether or not it references
- * the given variable associated with the given trigger.
- *
- * Return: The VAR_REF field if it does reference the variable, NULL if not
- */
- static struct hist_field *
- check_field_for_var_ref(struct hist_field *hist_field,
- struct hist_trigger_data *var_data,
- unsigned int var_idx)
- {
- struct hist_field *found = NULL;
- if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- if (hist_field->var.idx == var_idx &&
- hist_field->var.hist_data == var_data) {
- found = hist_field;
- }
- }
- return found;
- }
- static struct hist_field *
- check_field_for_var_refs(struct hist_trigger_data *hist_data,
- struct hist_field *hist_field,
- struct hist_trigger_data *var_data,
- unsigned int var_idx,
- unsigned int level)
- {
- struct hist_field *found = NULL;
- unsigned int i;
- if (level > 3)
- return found;
- if (!hist_field)
- return found;
- found = check_field_for_var_ref(hist_field, var_data, var_idx);
- if (found)
- return found;
- for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
- struct hist_field *operand;
- operand = hist_field->operands[i];
- found = check_field_for_var_refs(hist_data, operand, var_data,
- var_idx, level + 1);
- if (found)
- return found;
- }
- return found;
- }
- /**
- * find_var_ref - Check if a trigger has a reference to a trigger variable
- * @hist_data: The hist trigger that might have a reference to the variable
- * @var_data: The hist trigger that owns the variable
- * @var_idx: The trigger variable identifier
- *
- * Check the list of var_refs[] on the first hist trigger to see
- * whether any of them are references to the variable on the second
- * trigger.
- *
- * Return: The VAR_REF field referencing the variable if so, NULL if not
- */
- static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
- struct hist_trigger_data *var_data,
- unsigned int var_idx)
- {
- struct hist_field *hist_field, *found = NULL;
- unsigned int i;
- for_each_hist_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- found = check_field_for_var_refs(hist_data, hist_field,
- var_data, var_idx, 0);
- if (found)
- return found;
- }
- for (i = 0; i < hist_data->n_synth_var_refs; i++) {
- hist_field = hist_data->synth_var_refs[i];
- found = check_field_for_var_refs(hist_data, hist_field,
- var_data, var_idx, 0);
- if (found)
- return found;
- }
- return found;
- }
- /**
- * find_any_var_ref - Check if there is a reference to a given trigger variable
- * @hist_data: The hist trigger
- * @var_idx: The trigger variable identifier
- *
- * Check to see whether the given variable is currently referenced by
- * any other trigger.
- *
- * The trigger the variable is defined on is explicitly excluded - the
- * assumption being that a self-reference doesn't prevent a trigger
- * from being removed.
- *
- * Return: The VAR_REF field referencing the variable if so, NULL if not
- */
- static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
- unsigned int var_idx)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_field *found = NULL;
- struct hist_var_data *var_data;
- list_for_each_entry(var_data, &tr->hist_vars, list) {
- if (var_data->hist_data == hist_data)
- continue;
- found = find_var_ref(var_data->hist_data, hist_data, var_idx);
- if (found)
- break;
- }
- return found;
- }
- /**
- * check_var_refs - Check if there is a reference to any of trigger's variables
- * @hist_data: The hist trigger
- *
- * A trigger can define one or more variables. If any one of them is
- * currently referenced by any other trigger, this function will
- * determine that.
- * Typically used to determine whether or not a trigger can be removed
- * - if there are any references to a trigger's variables, it cannot.
- *
- * Return: True if there is a reference to any of trigger's variables
- */
- static bool check_var_refs(struct hist_trigger_data *hist_data)
- {
- struct hist_field *field;
- bool found = false;
- int i;
- for_each_hist_field(i, hist_data) {
- field = hist_data->fields[i];
- if (field && field->flags & HIST_FIELD_FL_VAR) {
- if (find_any_var_ref(hist_data, field->var.idx)) {
- found = true;
- break;
- }
- }
- }
- return found;
- }
- static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_var_data *var_data, *found = NULL;
- list_for_each_entry(var_data, &tr->hist_vars, list) {
- if (var_data->hist_data == hist_data) {
- found = var_data;
- break;
- }
- }
- return found;
- }
- static bool field_has_hist_vars(struct hist_field *hist_field,
- unsigned int level)
- {
- int i;
- if (level > 3)
- return false;
- if (!hist_field)
- return false;
- if (hist_field->flags & HIST_FIELD_FL_VAR ||
- hist_field->flags & HIST_FIELD_FL_VAR_REF)
- return true;
- for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
- struct hist_field *operand;
- operand = hist_field->operands[i];
- if (field_has_hist_vars(operand, level + 1))
- return true;
- }
- return false;
- }
- static bool has_hist_vars(struct hist_trigger_data *hist_data)
- {
- struct hist_field *hist_field;
- int i;
- for_each_hist_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- if (field_has_hist_vars(hist_field, 0))
- return true;
- }
- return false;
- }
- static int save_hist_vars(struct hist_trigger_data *hist_data)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_var_data *var_data;
- var_data = find_hist_vars(hist_data);
- if (var_data)
- return 0;
- if (trace_array_get(tr) < 0)
- return -ENODEV;
- var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
- if (!var_data) {
- trace_array_put(tr);
- return -ENOMEM;
- }
- var_data->hist_data = hist_data;
- list_add(&var_data->list, &tr->hist_vars);
- return 0;
- }
- static void remove_hist_vars(struct hist_trigger_data *hist_data)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_var_data *var_data;
- var_data = find_hist_vars(hist_data);
- if (!var_data)
- return;
- if (WARN_ON(check_var_refs(hist_data)))
- return;
- list_del(&var_data->list);
- kfree(var_data);
- trace_array_put(tr);
- }
- static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
- const char *var_name)
- {
- struct hist_field *hist_field, *found = NULL;
- int i;
- for_each_hist_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
- strcmp(hist_field->var.name, var_name) == 0) {
- found = hist_field;
- break;
- }
- }
- return found;
- }
- static struct hist_field *find_var(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- const char *var_name)
- {
- struct hist_trigger_data *test_data;
- struct event_trigger_data *test;
- struct hist_field *hist_field;
- lockdep_assert_held(&event_mutex);
- hist_field = find_var_field(hist_data, var_name);
- if (hist_field)
- return hist_field;
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- test_data = test->private_data;
- hist_field = find_var_field(test_data, var_name);
- if (hist_field)
- return hist_field;
- }
- }
- return NULL;
- }
- static struct trace_event_file *find_var_file(struct trace_array *tr,
- char *system,
- char *event_name,
- char *var_name)
- {
- struct hist_trigger_data *var_hist_data;
- struct hist_var_data *var_data;
- struct trace_event_file *file, *found = NULL;
- if (system)
- return find_event_file(tr, system, event_name);
- list_for_each_entry(var_data, &tr->hist_vars, list) {
- var_hist_data = var_data->hist_data;
- file = var_hist_data->event_file;
- if (file == found)
- continue;
- if (find_var_field(var_hist_data, var_name)) {
- if (found) {
- hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
- return NULL;
- }
- found = file;
- }
- }
- return found;
- }
- static struct hist_field *find_file_var(struct trace_event_file *file,
- const char *var_name)
- {
- struct hist_trigger_data *test_data;
- struct event_trigger_data *test;
- struct hist_field *hist_field;
- lockdep_assert_held(&event_mutex);
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- test_data = test->private_data;
- hist_field = find_var_field(test_data, var_name);
- if (hist_field)
- return hist_field;
- }
- }
- return NULL;
- }
- static struct hist_field *
- find_match_var(struct hist_trigger_data *hist_data, char *var_name)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_field *hist_field, *found = NULL;
- struct trace_event_file *file;
- unsigned int i;
- for (i = 0; i < hist_data->n_actions; i++) {
- struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace) {
- char *system = data->onmatch.match_event_system;
- char *event_name = data->onmatch.match_event;
- file = find_var_file(tr, system, event_name, var_name);
- if (!file)
- continue;
- hist_field = find_file_var(file, var_name);
- if (hist_field) {
- if (found) {
- hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
- return ERR_PTR(-EINVAL);
- }
- found = hist_field;
- }
- }
- }
- return found;
- }
- static struct hist_field *find_event_var(struct hist_trigger_data *hist_data,
- char *system,
- char *event_name,
- char *var_name)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct hist_field *hist_field = NULL;
- struct trace_event_file *file;
- if (!system || !event_name) {
- hist_field = find_match_var(hist_data, var_name);
- if (IS_ERR(hist_field))
- return NULL;
- if (hist_field)
- return hist_field;
- }
- file = find_var_file(tr, system, event_name, var_name);
- if (!file)
- return NULL;
- hist_field = find_file_var(file, var_name);
- return hist_field;
- }
- struct hist_elt_data {
- char *comm;
- u64 *var_ref_vals;
- char *field_var_str[SYNTH_FIELDS_MAX];
- };
- static u64 hist_field_var_ref(struct hist_field *hist_field,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *event)
- {
- struct hist_elt_data *elt_data;
- u64 var_val = 0;
- if (WARN_ON_ONCE(!elt))
- return var_val;
- elt_data = elt->private_data;
- var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
- return var_val;
- }
- static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
- u64 *var_ref_vals, bool self)
- {
- struct hist_trigger_data *var_data;
- struct tracing_map_elt *var_elt;
- struct hist_field *hist_field;
- unsigned int i, var_idx;
- bool resolved = true;
- u64 var_val = 0;
- for (i = 0; i < hist_data->n_var_refs; i++) {
- hist_field = hist_data->var_refs[i];
- var_idx = hist_field->var.idx;
- var_data = hist_field->var.hist_data;
- if (var_data == NULL) {
- resolved = false;
- break;
- }
- if ((self && var_data != hist_data) ||
- (!self && var_data == hist_data))
- continue;
- var_elt = tracing_map_lookup(var_data->map, key);
- if (!var_elt) {
- resolved = false;
- break;
- }
- if (!tracing_map_var_set(var_elt, var_idx)) {
- resolved = false;
- break;
- }
- if (self || !hist_field->read_once)
- var_val = tracing_map_read_var(var_elt, var_idx);
- else
- var_val = tracing_map_read_var_once(var_elt, var_idx);
- var_ref_vals[i] = var_val;
- }
- return resolved;
- }
- static const char *hist_field_name(struct hist_field *field,
- unsigned int level)
- {
- const char *field_name = "";
- if (level > 1)
- return field_name;
- if (field->field)
- field_name = field->field->name;
- else if (field->flags & HIST_FIELD_FL_LOG2 ||
- field->flags & HIST_FIELD_FL_ALIAS)
- field_name = hist_field_name(field->operands[0], ++level);
- else if (field->flags & HIST_FIELD_FL_CPU)
- field_name = "cpu";
- else if (field->flags & HIST_FIELD_FL_EXPR ||
- field->flags & HIST_FIELD_FL_VAR_REF) {
- if (field->system) {
- static char full_name[MAX_FILTER_STR_VAL];
- strcat(full_name, field->system);
- strcat(full_name, ".");
- strcat(full_name, field->event_name);
- strcat(full_name, ".");
- strcat(full_name, field->name);
- field_name = full_name;
- } else
- field_name = field->name;
- } else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
- field_name = "common_timestamp";
- if (field_name == NULL)
- field_name = "";
- return field_name;
- }
- static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
- {
- hist_field_fn_t fn = NULL;
- switch (field_size) {
- case 8:
- if (field_is_signed)
- fn = hist_field_s64;
- else
- fn = hist_field_u64;
- break;
- case 4:
- if (field_is_signed)
- fn = hist_field_s32;
- else
- fn = hist_field_u32;
- break;
- case 2:
- if (field_is_signed)
- fn = hist_field_s16;
- else
- fn = hist_field_u16;
- break;
- case 1:
- if (field_is_signed)
- fn = hist_field_s8;
- else
- fn = hist_field_u8;
- break;
- }
- return fn;
- }
- static int parse_map_size(char *str)
- {
- unsigned long size, map_bits;
- int ret;
- strsep(&str, "=");
- if (!str) {
- ret = -EINVAL;
- goto out;
- }
- ret = kstrtoul(str, 0, &size);
- if (ret)
- goto out;
- map_bits = ilog2(roundup_pow_of_two(size));
- if (map_bits < TRACING_MAP_BITS_MIN ||
- map_bits > TRACING_MAP_BITS_MAX)
- ret = -EINVAL;
- else
- ret = map_bits;
- out:
- return ret;
- }
- static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
- {
- unsigned int i;
- if (!attrs)
- return;
- for (i = 0; i < attrs->n_assignments; i++)
- kfree(attrs->assignment_str[i]);
- for (i = 0; i < attrs->n_actions; i++)
- kfree(attrs->action_str[i]);
- kfree(attrs->name);
- kfree(attrs->sort_key_str);
- kfree(attrs->keys_str);
- kfree(attrs->vals_str);
- kfree(attrs->clock);
- kfree(attrs);
- }
- static int parse_action(char *str, struct hist_trigger_attrs *attrs)
- {
- int ret = -EINVAL;
- if (attrs->n_actions >= HIST_ACTIONS_MAX)
- return ret;
- if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) ||
- (strncmp(str, "onmax(", strlen("onmax(")) == 0)) {
- attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
- if (!attrs->action_str[attrs->n_actions]) {
- ret = -ENOMEM;
- return ret;
- }
- attrs->n_actions++;
- ret = 0;
- }
- return ret;
- }
- static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
- {
- int ret = 0;
- if ((strncmp(str, "key=", strlen("key=")) == 0) ||
- (strncmp(str, "keys=", strlen("keys=")) == 0)) {
- attrs->keys_str = kstrdup(str, GFP_KERNEL);
- if (!attrs->keys_str) {
- ret = -ENOMEM;
- goto out;
- }
- } else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
- (strncmp(str, "vals=", strlen("vals=")) == 0) ||
- (strncmp(str, "values=", strlen("values=")) == 0)) {
- attrs->vals_str = kstrdup(str, GFP_KERNEL);
- if (!attrs->vals_str) {
- ret = -ENOMEM;
- goto out;
- }
- } else if (strncmp(str, "sort=", strlen("sort=")) == 0) {
- attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
- if (!attrs->sort_key_str) {
- ret = -ENOMEM;
- goto out;
- }
- } else if (strncmp(str, "name=", strlen("name=")) == 0) {
- attrs->name = kstrdup(str, GFP_KERNEL);
- if (!attrs->name) {
- ret = -ENOMEM;
- goto out;
- }
- } else if (strncmp(str, "clock=", strlen("clock=")) == 0) {
- strsep(&str, "=");
- if (!str) {
- ret = -EINVAL;
- goto out;
- }
- str = strstrip(str);
- attrs->clock = kstrdup(str, GFP_KERNEL);
- if (!attrs->clock) {
- ret = -ENOMEM;
- goto out;
- }
- } else if (strncmp(str, "size=", strlen("size=")) == 0) {
- int map_bits = parse_map_size(str);
- if (map_bits < 0) {
- ret = map_bits;
- goto out;
- }
- attrs->map_bits = map_bits;
- } else {
- char *assignment;
- if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
- hist_err("Too many variables defined: ", str);
- ret = -EINVAL;
- goto out;
- }
- assignment = kstrdup(str, GFP_KERNEL);
- if (!assignment) {
- ret = -ENOMEM;
- goto out;
- }
- attrs->assignment_str[attrs->n_assignments++] = assignment;
- }
- out:
- return ret;
- }
- static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
- {
- struct hist_trigger_attrs *attrs;
- int ret = 0;
- attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
- if (!attrs)
- return ERR_PTR(-ENOMEM);
- while (trigger_str) {
- char *str = strsep(&trigger_str, ":");
- if (strchr(str, '=')) {
- ret = parse_assignment(str, attrs);
- if (ret)
- goto free;
- } else if (strcmp(str, "pause") == 0)
- attrs->pause = true;
- else if ((strcmp(str, "cont") == 0) ||
- (strcmp(str, "continue") == 0))
- attrs->cont = true;
- else if (strcmp(str, "clear") == 0)
- attrs->clear = true;
- else {
- ret = parse_action(str, attrs);
- if (ret)
- goto free;
- }
- }
- if (!attrs->keys_str) {
- ret = -EINVAL;
- goto free;
- }
- if (!attrs->clock) {
- attrs->clock = kstrdup("global", GFP_KERNEL);
- if (!attrs->clock) {
- ret = -ENOMEM;
- goto free;
- }
- }
- return attrs;
- free:
- destroy_hist_trigger_attrs(attrs);
- return ERR_PTR(ret);
- }
- static inline void save_comm(char *comm, struct task_struct *task)
- {
- if (!task->pid) {
- strcpy(comm, "<idle>");
- return;
- }
- if (WARN_ON_ONCE(task->pid < 0)) {
- strcpy(comm, "<XXX>");
- return;
- }
- memcpy(comm, task->comm, TASK_COMM_LEN);
- }
- static void hist_elt_data_free(struct hist_elt_data *elt_data)
- {
- unsigned int i;
- for (i = 0; i < SYNTH_FIELDS_MAX; i++)
- kfree(elt_data->field_var_str[i]);
- kfree(elt_data->comm);
- kfree(elt_data);
- }
- static void hist_trigger_elt_data_free(struct tracing_map_elt *elt)
- {
- struct hist_elt_data *elt_data = elt->private_data;
- hist_elt_data_free(elt_data);
- }
- static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
- {
- struct hist_trigger_data *hist_data = elt->map->private_data;
- unsigned int size = TASK_COMM_LEN;
- struct hist_elt_data *elt_data;
- struct hist_field *key_field;
- unsigned int i, n_str;
- elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
- if (!elt_data)
- return -ENOMEM;
- for_each_hist_key_field(i, hist_data) {
- key_field = hist_data->fields[i];
- if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
- elt_data->comm = kzalloc(size, GFP_KERNEL);
- if (!elt_data->comm) {
- kfree(elt_data);
- return -ENOMEM;
- }
- break;
- }
- }
- n_str = hist_data->n_field_var_str + hist_data->n_max_var_str;
- size = STR_VAR_LEN_MAX;
- for (i = 0; i < n_str; i++) {
- elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL);
- if (!elt_data->field_var_str[i]) {
- hist_elt_data_free(elt_data);
- return -ENOMEM;
- }
- }
- elt->private_data = elt_data;
- return 0;
- }
- static void hist_trigger_elt_data_init(struct tracing_map_elt *elt)
- {
- struct hist_elt_data *elt_data = elt->private_data;
- if (elt_data->comm)
- save_comm(elt_data->comm, current);
- }
- static const struct tracing_map_ops hist_trigger_elt_data_ops = {
- .elt_alloc = hist_trigger_elt_data_alloc,
- .elt_free = hist_trigger_elt_data_free,
- .elt_init = hist_trigger_elt_data_init,
- };
- 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";
- else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
- flags_str = "usecs";
- return flags_str;
- }
- static void expr_field_str(struct hist_field *field, char *expr)
- {
- if (field->flags & HIST_FIELD_FL_VAR_REF)
- strcat(expr, "$");
- strcat(expr, hist_field_name(field, 0));
- if (field->flags && !(field->flags & HIST_FIELD_FL_VAR_REF)) {
- const char *flags_str = get_hist_field_flags(field);
- if (flags_str) {
- strcat(expr, ".");
- strcat(expr, flags_str);
- }
- }
- }
- static char *expr_str(struct hist_field *field, unsigned int level)
- {
- char *expr;
- if (level > 1)
- return NULL;
- expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
- if (!expr)
- return NULL;
- if (!field->operands[0]) {
- expr_field_str(field, expr);
- return expr;
- }
- if (field->operator == FIELD_OP_UNARY_MINUS) {
- char *subexpr;
- strcat(expr, "-(");
- subexpr = expr_str(field->operands[0], ++level);
- if (!subexpr) {
- kfree(expr);
- return NULL;
- }
- strcat(expr, subexpr);
- strcat(expr, ")");
- kfree(subexpr);
- return expr;
- }
- expr_field_str(field->operands[0], expr);
- switch (field->operator) {
- case FIELD_OP_MINUS:
- strcat(expr, "-");
- break;
- case FIELD_OP_PLUS:
- strcat(expr, "+");
- break;
- default:
- kfree(expr);
- return NULL;
- }
- expr_field_str(field->operands[1], expr);
- return expr;
- }
- static int contains_operator(char *str)
- {
- enum field_op_id field_op = FIELD_OP_NONE;
- char *op;
- op = strpbrk(str, "+-");
- if (!op)
- return FIELD_OP_NONE;
- switch (*op) {
- case '-':
- if (*str == '-')
- field_op = FIELD_OP_UNARY_MINUS;
- else
- field_op = FIELD_OP_MINUS;
- break;
- case '+':
- field_op = FIELD_OP_PLUS;
- break;
- default:
- break;
- }
- return field_op;
- }
- static void get_hist_field(struct hist_field *hist_field)
- {
- hist_field->ref++;
- }
- static void __destroy_hist_field(struct hist_field *hist_field)
- {
- if (--hist_field->ref > 1)
- return;
- kfree(hist_field->var.name);
- kfree(hist_field->name);
- kfree(hist_field->type);
- kfree(hist_field);
- }
- static void destroy_hist_field(struct hist_field *hist_field,
- unsigned int level)
- {
- unsigned int i;
- if (level > 3)
- return;
- if (!hist_field)
- return;
- if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
- return; /* var refs will be destroyed separately */
- for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
- destroy_hist_field(hist_field->operands[i], level + 1);
- __destroy_hist_field(hist_field);
- }
- static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
- struct ftrace_event_field *field,
- unsigned long flags,
- char *var_name)
- {
- struct hist_field *hist_field;
- if (field && is_function_field(field))
- return NULL;
- hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
- if (!hist_field)
- return NULL;
- hist_field->ref = 1;
- hist_field->hist_data = hist_data;
- if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
- goto out; /* caller will populate */
- if (flags & HIST_FIELD_FL_VAR_REF) {
- hist_field->fn = hist_field_var_ref;
- goto out;
- }
- if (flags & HIST_FIELD_FL_HITCOUNT) {
- hist_field->fn = hist_field_counter;
- hist_field->size = sizeof(u64);
- hist_field->type = kstrdup("u64", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- goto out;
- }
- if (flags & HIST_FIELD_FL_STACKTRACE) {
- hist_field->fn = hist_field_none;
- goto out;
- }
- if (flags & HIST_FIELD_FL_LOG2) {
- unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
- hist_field->fn = hist_field_log2;
- hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
- hist_field->size = hist_field->operands[0]->size;
- hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- goto out;
- }
- if (flags & HIST_FIELD_FL_TIMESTAMP) {
- hist_field->fn = hist_field_timestamp;
- hist_field->size = sizeof(u64);
- hist_field->type = kstrdup("u64", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- goto out;
- }
- if (flags & HIST_FIELD_FL_CPU) {
- hist_field->fn = hist_field_cpu;
- hist_field->size = sizeof(int);
- hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- goto out;
- }
- if (WARN_ON_ONCE(!field))
- goto out;
- if (is_string_field(field)) {
- flags |= HIST_FIELD_FL_STRING;
- hist_field->size = MAX_FILTER_STR_VAL;
- hist_field->type = kstrdup(field->type, GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- if (field->filter_type == FILTER_STATIC_STRING)
- hist_field->fn = hist_field_string;
- else if (field->filter_type == FILTER_DYN_STRING)
- hist_field->fn = hist_field_dynstring;
- else
- hist_field->fn = hist_field_pstring;
- } else {
- hist_field->size = field->size;
- hist_field->is_signed = field->is_signed;
- hist_field->type = kstrdup(field->type, GFP_KERNEL);
- if (!hist_field->type)
- goto free;
- hist_field->fn = select_value_fn(field->size,
- field->is_signed);
- if (!hist_field->fn) {
- destroy_hist_field(hist_field, 0);
- return NULL;
- }
- }
- out:
- hist_field->field = field;
- hist_field->flags = flags;
- if (var_name) {
- hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
- if (!hist_field->var.name)
- goto free;
- }
- return hist_field;
- free:
- destroy_hist_field(hist_field, 0);
- return NULL;
- }
- static void destroy_hist_fields(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < HIST_FIELDS_MAX; i++) {
- if (hist_data->fields[i]) {
- destroy_hist_field(hist_data->fields[i], 0);
- hist_data->fields[i] = NULL;
- }
- }
- for (i = 0; i < hist_data->n_var_refs; i++) {
- WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
- __destroy_hist_field(hist_data->var_refs[i]);
- hist_data->var_refs[i] = NULL;
- }
- }
- static int init_var_ref(struct hist_field *ref_field,
- struct hist_field *var_field,
- char *system, char *event_name)
- {
- int err = 0;
- ref_field->var.idx = var_field->var.idx;
- ref_field->var.hist_data = var_field->hist_data;
- ref_field->size = var_field->size;
- ref_field->is_signed = var_field->is_signed;
- ref_field->flags |= var_field->flags &
- (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
- if (system) {
- ref_field->system = kstrdup(system, GFP_KERNEL);
- if (!ref_field->system)
- return -ENOMEM;
- }
- if (event_name) {
- ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
- if (!ref_field->event_name) {
- err = -ENOMEM;
- goto free;
- }
- }
- if (var_field->var.name) {
- ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
- if (!ref_field->name) {
- err = -ENOMEM;
- goto free;
- }
- } else if (var_field->name) {
- ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
- if (!ref_field->name) {
- err = -ENOMEM;
- goto free;
- }
- }
- ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
- if (!ref_field->type) {
- err = -ENOMEM;
- goto free;
- }
- out:
- return err;
- free:
- kfree(ref_field->system);
- kfree(ref_field->event_name);
- kfree(ref_field->name);
- goto out;
- }
- /**
- * create_var_ref - Create a variable reference and attach it to trigger
- * @hist_data: The trigger that will be referencing the variable
- * @var_field: The VAR field to create a reference to
- * @system: The optional system string
- * @event_name: The optional event_name string
- *
- * Given a variable hist_field, create a VAR_REF hist_field that
- * represents a reference to it.
- *
- * This function also adds the reference to the trigger that
- * now references the variable.
- *
- * Return: The VAR_REF field if successful, NULL if not
- */
- static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
- struct hist_field *var_field,
- char *system, char *event_name)
- {
- unsigned long flags = HIST_FIELD_FL_VAR_REF;
- struct hist_field *ref_field;
- int i;
- /* Check if the variable already exists */
- for (i = 0; i < hist_data->n_var_refs; i++) {
- ref_field = hist_data->var_refs[i];
- if (ref_field->var.idx == var_field->var.idx &&
- ref_field->var.hist_data == var_field->hist_data) {
- get_hist_field(ref_field);
- return ref_field;
- }
- }
- ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
- if (ref_field) {
- if (init_var_ref(ref_field, var_field, system, event_name)) {
- destroy_hist_field(ref_field, 0);
- return NULL;
- }
- hist_data->var_refs[hist_data->n_var_refs] = ref_field;
- ref_field->var_ref_idx = hist_data->n_var_refs++;
- }
- return ref_field;
- }
- static bool is_var_ref(char *var_name)
- {
- if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
- return false;
- return true;
- }
- static char *field_name_from_var(struct hist_trigger_data *hist_data,
- char *var_name)
- {
- char *name, *field;
- unsigned int i;
- for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
- name = hist_data->attrs->var_defs.name[i];
- if (strcmp(var_name, name) == 0) {
- field = hist_data->attrs->var_defs.expr[i];
- if (contains_operator(field) || is_var_ref(field))
- continue;
- return field;
- }
- }
- return NULL;
- }
- static char *local_field_var_ref(struct hist_trigger_data *hist_data,
- char *system, char *event_name,
- char *var_name)
- {
- struct trace_event_call *call;
- if (system && event_name) {
- call = hist_data->event_file->event_call;
- if (strcmp(system, call->class->system) != 0)
- return NULL;
- if (strcmp(event_name, trace_event_name(call)) != 0)
- return NULL;
- }
- if (!!system != !!event_name)
- return NULL;
- if (!is_var_ref(var_name))
- return NULL;
- var_name++;
- return field_name_from_var(hist_data, var_name);
- }
- static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
- char *system, char *event_name,
- char *var_name)
- {
- struct hist_field *var_field = NULL, *ref_field = NULL;
- if (!is_var_ref(var_name))
- return NULL;
- var_name++;
- var_field = find_event_var(hist_data, system, event_name, var_name);
- if (var_field)
- ref_field = create_var_ref(hist_data, var_field,
- system, event_name);
- if (!ref_field)
- hist_err_event("Couldn't find variable: $",
- system, event_name, var_name);
- return ref_field;
- }
- static struct ftrace_event_field *
- parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
- char *field_str, unsigned long *flags)
- {
- struct ftrace_event_field *field = NULL;
- char *field_name, *modifier, *str;
- modifier = str = kstrdup(field_str, GFP_KERNEL);
- if (!modifier)
- return ERR_PTR(-ENOMEM);
- field_name = strsep(&modifier, ".");
- if (modifier) {
- if (strcmp(modifier, "hex") == 0)
- *flags |= HIST_FIELD_FL_HEX;
- else if (strcmp(modifier, "sym") == 0)
- *flags |= HIST_FIELD_FL_SYM;
- else if (strcmp(modifier, "sym-offset") == 0)
- *flags |= HIST_FIELD_FL_SYM_OFFSET;
- else if ((strcmp(modifier, "execname") == 0) &&
- (strcmp(field_name, "common_pid") == 0))
- *flags |= HIST_FIELD_FL_EXECNAME;
- else if (strcmp(modifier, "syscall") == 0)
- *flags |= HIST_FIELD_FL_SYSCALL;
- else if (strcmp(modifier, "log2") == 0)
- *flags |= HIST_FIELD_FL_LOG2;
- else if (strcmp(modifier, "usecs") == 0)
- *flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
- else {
- hist_err("Invalid field modifier: ", modifier);
- field = ERR_PTR(-EINVAL);
- goto out;
- }
- }
- if (strcmp(field_name, "common_timestamp") == 0) {
- *flags |= HIST_FIELD_FL_TIMESTAMP;
- hist_data->enable_timestamps = true;
- if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
- hist_data->attrs->ts_in_usecs = true;
- } else if (strcmp(field_name, "cpu") == 0)
- *flags |= HIST_FIELD_FL_CPU;
- else {
- field = trace_find_event_field(file->event_call, field_name);
- if (!field || !field->size) {
- hist_err("Couldn't find field: ", field_name);
- field = ERR_PTR(-EINVAL);
- goto out;
- }
- }
- out:
- kfree(str);
- return field;
- }
- static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
- struct hist_field *var_ref,
- char *var_name)
- {
- struct hist_field *alias = NULL;
- unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
- alias = create_hist_field(hist_data, NULL, flags, var_name);
- if (!alias)
- return NULL;
- alias->fn = var_ref->fn;
- alias->operands[0] = var_ref;
- if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
- destroy_hist_field(alias, 0);
- return NULL;
- }
- alias->var_ref_idx = var_ref->var_ref_idx;
- return alias;
- }
- static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
- struct trace_event_file *file, char *str,
- unsigned long *flags, char *var_name)
- {
- char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
- struct ftrace_event_field *field = NULL;
- struct hist_field *hist_field = NULL;
- int ret = 0;
- s = strchr(str, '.');
- if (s) {
- s = strchr(++s, '.');
- if (s) {
- ref_system = strsep(&str, ".");
- if (!str) {
- ret = -EINVAL;
- goto out;
- }
- ref_event = strsep(&str, ".");
- if (!str) {
- ret = -EINVAL;
- goto out;
- }
- ref_var = str;
- }
- }
- s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
- if (!s) {
- hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var);
- if (hist_field) {
- if (var_name) {
- hist_field = create_alias(hist_data, hist_field, var_name);
- if (!hist_field) {
- ret = -ENOMEM;
- goto out;
- }
- }
- return hist_field;
- }
- } else
- str = s;
- field = parse_field(hist_data, file, str, flags);
- if (IS_ERR(field)) {
- ret = PTR_ERR(field);
- goto out;
- }
- hist_field = create_hist_field(hist_data, field, *flags, var_name);
- if (!hist_field) {
- ret = -ENOMEM;
- goto out;
- }
- return hist_field;
- out:
- return ERR_PTR(ret);
- }
- static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- char *str, unsigned long flags,
- char *var_name, unsigned int level);
- static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- char *str, unsigned long flags,
- char *var_name, unsigned int level)
- {
- struct hist_field *operand1, *expr = NULL;
- unsigned long operand_flags;
- int ret = 0;
- char *s;
- /* we support only -(xxx) i.e. explicit parens required */
- if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
- ret = -EINVAL;
- goto free;
- }
- str++; /* skip leading '-' */
- s = strchr(str, '(');
- if (s)
- str++;
- else {
- ret = -EINVAL;
- goto free;
- }
- s = strrchr(str, ')');
- if (s)
- *s = '\0';
- else {
- ret = -EINVAL; /* no closing ')' */
- goto free;
- }
- flags |= HIST_FIELD_FL_EXPR;
- expr = create_hist_field(hist_data, NULL, flags, var_name);
- if (!expr) {
- ret = -ENOMEM;
- goto free;
- }
- operand_flags = 0;
- operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
- if (IS_ERR(operand1)) {
- ret = PTR_ERR(operand1);
- goto free;
- }
- expr->flags |= operand1->flags &
- (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
- expr->fn = hist_field_unary_minus;
- expr->operands[0] = operand1;
- expr->operator = FIELD_OP_UNARY_MINUS;
- expr->name = expr_str(expr, 0);
- expr->type = kstrdup(operand1->type, GFP_KERNEL);
- if (!expr->type) {
- ret = -ENOMEM;
- goto free;
- }
- return expr;
- free:
- destroy_hist_field(expr, 0);
- return ERR_PTR(ret);
- }
- static int check_expr_operands(struct hist_field *operand1,
- struct hist_field *operand2)
- {
- unsigned long operand1_flags = operand1->flags;
- unsigned long operand2_flags = operand2->flags;
- if ((operand1_flags & HIST_FIELD_FL_VAR_REF) ||
- (operand1_flags & HIST_FIELD_FL_ALIAS)) {
- struct hist_field *var;
- var = find_var_field(operand1->var.hist_data, operand1->name);
- if (!var)
- return -EINVAL;
- operand1_flags = var->flags;
- }
- if ((operand2_flags & HIST_FIELD_FL_VAR_REF) ||
- (operand2_flags & HIST_FIELD_FL_ALIAS)) {
- struct hist_field *var;
- var = find_var_field(operand2->var.hist_data, operand2->name);
- if (!var)
- return -EINVAL;
- operand2_flags = var->flags;
- }
- if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
- (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
- hist_err("Timestamp units in expression don't match", NULL);
- return -EINVAL;
- }
- return 0;
- }
- static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- char *str, unsigned long flags,
- char *var_name, unsigned int level)
- {
- struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL;
- unsigned long operand_flags;
- int field_op, ret = -EINVAL;
- char *sep, *operand1_str;
- if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
- return ERR_PTR(-EINVAL);
- }
- field_op = contains_operator(str);
- if (field_op == FIELD_OP_NONE)
- return parse_atom(hist_data, file, str, &flags, var_name);
- if (field_op == FIELD_OP_UNARY_MINUS)
- return parse_unary(hist_data, file, str, flags, var_name, ++level);
- switch (field_op) {
- case FIELD_OP_MINUS:
- sep = "-";
- break;
- case FIELD_OP_PLUS:
- sep = "+";
- break;
- default:
- goto free;
- }
- operand1_str = strsep(&str, sep);
- if (!operand1_str || !str)
- goto free;
- operand_flags = 0;
- operand1 = parse_atom(hist_data, file, operand1_str,
- &operand_flags, NULL);
- if (IS_ERR(operand1)) {
- ret = PTR_ERR(operand1);
- operand1 = NULL;
- goto free;
- }
- /* rest of string could be another expression e.g. b+c in a+b+c */
- operand_flags = 0;
- operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level);
- if (IS_ERR(operand2)) {
- ret = PTR_ERR(operand2);
- operand2 = NULL;
- goto free;
- }
- ret = check_expr_operands(operand1, operand2);
- if (ret)
- goto free;
- flags |= HIST_FIELD_FL_EXPR;
- flags |= operand1->flags &
- (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
- expr = create_hist_field(hist_data, NULL, flags, var_name);
- if (!expr) {
- ret = -ENOMEM;
- goto free;
- }
- operand1->read_once = true;
- operand2->read_once = true;
- expr->operands[0] = operand1;
- expr->operands[1] = operand2;
- expr->operator = field_op;
- expr->name = expr_str(expr, 0);
- expr->type = kstrdup(operand1->type, GFP_KERNEL);
- if (!expr->type) {
- ret = -ENOMEM;
- goto free;
- }
- switch (field_op) {
- case FIELD_OP_MINUS:
- expr->fn = hist_field_minus;
- break;
- case FIELD_OP_PLUS:
- expr->fn = hist_field_plus;
- break;
- default:
- ret = -EINVAL;
- goto free;
- }
- return expr;
- free:
- destroy_hist_field(operand1, 0);
- destroy_hist_field(operand2, 0);
- destroy_hist_field(expr, 0);
- return ERR_PTR(ret);
- }
- static char *find_trigger_filter(struct hist_trigger_data *hist_data,
- struct trace_event_file *file)
- {
- struct event_trigger_data *test;
- lockdep_assert_held(&event_mutex);
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (test->private_data == hist_data)
- return test->filter_str;
- }
- }
- return NULL;
- }
- static struct event_command trigger_hist_cmd;
- static int event_hist_trigger_func(struct event_command *cmd_ops,
- struct trace_event_file *file,
- char *glob, char *cmd, char *param);
- static bool compatible_keys(struct hist_trigger_data *target_hist_data,
- struct hist_trigger_data *hist_data,
- unsigned int n_keys)
- {
- struct hist_field *target_hist_field, *hist_field;
- unsigned int n, i, j;
- if (hist_data->n_fields - hist_data->n_vals != n_keys)
- return false;
- i = hist_data->n_vals;
- j = target_hist_data->n_vals;
- for (n = 0; n < n_keys; n++) {
- hist_field = hist_data->fields[i + n];
- target_hist_field = target_hist_data->fields[j + n];
- if (strcmp(hist_field->type, target_hist_field->type) != 0)
- return false;
- if (hist_field->size != target_hist_field->size)
- return false;
- if (hist_field->is_signed != target_hist_field->is_signed)
- return false;
- }
- return true;
- }
- static struct hist_trigger_data *
- find_compatible_hist(struct hist_trigger_data *target_hist_data,
- struct trace_event_file *file)
- {
- struct hist_trigger_data *hist_data;
- struct event_trigger_data *test;
- unsigned int n_keys;
- lockdep_assert_held(&event_mutex);
- n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- hist_data = test->private_data;
- if (compatible_keys(target_hist_data, hist_data, n_keys))
- return hist_data;
- }
- }
- return NULL;
- }
- static struct trace_event_file *event_file(struct trace_array *tr,
- char *system, char *event_name)
- {
- struct trace_event_file *file;
- file = __find_event_file(tr, system, event_name);
- if (!file)
- return ERR_PTR(-EINVAL);
- return file;
- }
- static struct hist_field *
- find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
- char *system, char *event_name, char *field_name)
- {
- struct hist_field *event_var;
- char *synthetic_name;
- synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
- if (!synthetic_name)
- return ERR_PTR(-ENOMEM);
- strcpy(synthetic_name, "synthetic_");
- strcat(synthetic_name, field_name);
- event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
- kfree(synthetic_name);
- return event_var;
- }
- /**
- * create_field_var_hist - Automatically create a histogram and var for a field
- * @target_hist_data: The target hist trigger
- * @subsys_name: Optional subsystem name
- * @event_name: Optional event name
- * @field_name: The name of the field (and the resulting variable)
- *
- * Hist trigger actions fetch data from variables, not directly from
- * events. However, for convenience, users are allowed to directly
- * specify an event field in an action, which will be automatically
- * converted into a variable on their behalf.
- * If a user specifies a field on an event that isn't the event the
- * histogram currently being defined (the target event histogram), the
- * only way that can be accomplished is if a new hist trigger is
- * created and the field variable defined on that.
- *
- * This function creates a new histogram compatible with the target
- * event (meaning a histogram with the same key as the target
- * histogram), and creates a variable for the specified field, but
- * with 'synthetic_' prepended to the variable name in order to avoid
- * collision with normal field variables.
- *
- * Return: The variable created for the field.
- */
- static struct hist_field *
- create_field_var_hist(struct hist_trigger_data *target_hist_data,
- char *subsys_name, char *event_name, char *field_name)
- {
- struct trace_array *tr = target_hist_data->event_file->tr;
- struct hist_field *event_var = ERR_PTR(-EINVAL);
- struct hist_trigger_data *hist_data;
- unsigned int i, n, first = true;
- struct field_var_hist *var_hist;
- struct trace_event_file *file;
- struct hist_field *key_field;
- char *saved_filter;
- char *cmd;
- int ret;
- if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
- hist_err_event("onmatch: Too many field variables defined: ",
- subsys_name, event_name, field_name);
- return ERR_PTR(-EINVAL);
- }
- file = event_file(tr, subsys_name, event_name);
- if (IS_ERR(file)) {
- hist_err_event("onmatch: Event file not found: ",
- subsys_name, event_name, field_name);
- ret = PTR_ERR(file);
- return ERR_PTR(ret);
- }
- /*
- * Look for a histogram compatible with target. We'll use the
- * found histogram specification to create a new matching
- * histogram with our variable on it. target_hist_data is not
- * yet a registered histogram so we can't use that.
- */
- hist_data = find_compatible_hist(target_hist_data, file);
- if (!hist_data) {
- hist_err_event("onmatch: Matching event histogram not found: ",
- subsys_name, event_name, field_name);
- return ERR_PTR(-EINVAL);
- }
- /* See if a synthetic field variable has already been created */
- event_var = find_synthetic_field_var(target_hist_data, subsys_name,
- event_name, field_name);
- if (!IS_ERR_OR_NULL(event_var))
- return event_var;
- var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL);
- if (!var_hist)
- return ERR_PTR(-ENOMEM);
- cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
- if (!cmd) {
- kfree(var_hist);
- return ERR_PTR(-ENOMEM);
- }
- /* Use the same keys as the compatible histogram */
- strcat(cmd, "keys=");
- for_each_hist_key_field(i, hist_data) {
- key_field = hist_data->fields[i];
- if (!first)
- strcat(cmd, ",");
- strcat(cmd, key_field->field->name);
- first = false;
- }
- /* Create the synthetic field variable specification */
- strcat(cmd, ":synthetic_");
- strcat(cmd, field_name);
- strcat(cmd, "=");
- strcat(cmd, field_name);
- /* Use the same filter as the compatible histogram */
- saved_filter = find_trigger_filter(hist_data, file);
- if (saved_filter) {
- strcat(cmd, " if ");
- strcat(cmd, saved_filter);
- }
- var_hist->cmd = kstrdup(cmd, GFP_KERNEL);
- if (!var_hist->cmd) {
- kfree(cmd);
- kfree(var_hist);
- return ERR_PTR(-ENOMEM);
- }
- /* Save the compatible histogram information */
- var_hist->hist_data = hist_data;
- /* Create the new histogram with our variable */
- ret = event_hist_trigger_func(&trigger_hist_cmd, file,
- "", "hist", cmd);
- if (ret) {
- kfree(cmd);
- kfree(var_hist->cmd);
- kfree(var_hist);
- hist_err_event("onmatch: Couldn't create histogram for field: ",
- subsys_name, event_name, field_name);
- return ERR_PTR(ret);
- }
- kfree(cmd);
- /* If we can't find the variable, something went wrong */
- event_var = find_synthetic_field_var(target_hist_data, subsys_name,
- event_name, field_name);
- if (IS_ERR_OR_NULL(event_var)) {
- kfree(var_hist->cmd);
- kfree(var_hist);
- hist_err_event("onmatch: Couldn't find synthetic variable: ",
- subsys_name, event_name, field_name);
- return ERR_PTR(-EINVAL);
- }
- n = target_hist_data->n_field_var_hists;
- target_hist_data->field_var_hists[n] = var_hist;
- target_hist_data->n_field_var_hists++;
- return event_var;
- }
- static struct hist_field *
- find_target_event_var(struct hist_trigger_data *hist_data,
- char *subsys_name, char *event_name, char *var_name)
- {
- struct trace_event_file *file = hist_data->event_file;
- struct hist_field *hist_field = NULL;
- if (subsys_name) {
- struct trace_event_call *call;
- if (!event_name)
- return NULL;
- call = file->event_call;
- if (strcmp(subsys_name, call->class->system) != 0)
- return NULL;
- if (strcmp(event_name, trace_event_name(call)) != 0)
- return NULL;
- }
- hist_field = find_var_field(hist_data, var_name);
- return hist_field;
- }
- static inline void __update_field_vars(struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *rec,
- struct field_var **field_vars,
- unsigned int n_field_vars,
- unsigned int field_var_str_start)
- {
- struct hist_elt_data *elt_data = elt->private_data;
- unsigned int i, j, var_idx;
- u64 var_val;
- for (i = 0, j = field_var_str_start; i < n_field_vars; i++) {
- struct field_var *field_var = field_vars[i];
- struct hist_field *var = field_var->var;
- struct hist_field *val = field_var->val;
- var_val = val->fn(val, elt, rbe, rec);
- var_idx = var->var.idx;
- if (val->flags & HIST_FIELD_FL_STRING) {
- char *str = elt_data->field_var_str[j++];
- char *val_str = (char *)(uintptr_t)var_val;
- strscpy(str, val_str, STR_VAR_LEN_MAX);
- var_val = (u64)(uintptr_t)str;
- }
- tracing_map_set_var(elt, var_idx, var_val);
- }
- }
- static void update_field_vars(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *rec)
- {
- __update_field_vars(elt, rbe, rec, hist_data->field_vars,
- hist_data->n_field_vars, 0);
- }
- static void update_max_vars(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *rec)
- {
- __update_field_vars(elt, rbe, rec, hist_data->max_vars,
- hist_data->n_max_vars, hist_data->n_field_var_str);
- }
- static struct hist_field *create_var(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- char *name, int size, const char *type)
- {
- struct hist_field *var;
- int idx;
- if (find_var(hist_data, file, name) && !hist_data->remove) {
- var = ERR_PTR(-EINVAL);
- goto out;
- }
- var = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
- if (!var) {
- var = ERR_PTR(-ENOMEM);
- goto out;
- }
- idx = tracing_map_add_var(hist_data->map);
- if (idx < 0) {
- kfree(var);
- var = ERR_PTR(-EINVAL);
- goto out;
- }
- var->flags = HIST_FIELD_FL_VAR;
- var->var.idx = idx;
- var->var.hist_data = var->hist_data = hist_data;
- var->size = size;
- var->var.name = kstrdup(name, GFP_KERNEL);
- var->type = kstrdup(type, GFP_KERNEL);
- if (!var->var.name || !var->type) {
- kfree(var->var.name);
- kfree(var->type);
- kfree(var);
- var = ERR_PTR(-ENOMEM);
- }
- out:
- return var;
- }
- static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- char *field_name)
- {
- struct hist_field *val = NULL, *var = NULL;
- unsigned long flags = HIST_FIELD_FL_VAR;
- struct field_var *field_var;
- int ret = 0;
- if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
- hist_err("Too many field variables defined: ", field_name);
- ret = -EINVAL;
- goto err;
- }
- val = parse_atom(hist_data, file, field_name, &flags, NULL);
- if (IS_ERR(val)) {
- hist_err("Couldn't parse field variable: ", field_name);
- ret = PTR_ERR(val);
- goto err;
- }
- var = create_var(hist_data, file, field_name, val->size, val->type);
- if (IS_ERR(var)) {
- hist_err("Couldn't create or find variable: ", field_name);
- kfree(val);
- ret = PTR_ERR(var);
- goto err;
- }
- field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL);
- if (!field_var) {
- kfree(val);
- kfree(var);
- ret = -ENOMEM;
- goto err;
- }
- field_var->var = var;
- field_var->val = val;
- out:
- return field_var;
- err:
- field_var = ERR_PTR(ret);
- goto out;
- }
- /**
- * create_target_field_var - Automatically create a variable for a field
- * @target_hist_data: The target hist trigger
- * @subsys_name: Optional subsystem name
- * @event_name: Optional event name
- * @var_name: The name of the field (and the resulting variable)
- *
- * Hist trigger actions fetch data from variables, not directly from
- * events. However, for convenience, users are allowed to directly
- * specify an event field in an action, which will be automatically
- * converted into a variable on their behalf.
- * This function creates a field variable with the name var_name on
- * the hist trigger currently being defined on the target event. If
- * subsys_name and event_name are specified, this function simply
- * verifies that they do in fact match the target event subsystem and
- * event name.
- *
- * Return: The variable created for the field.
- */
- static struct field_var *
- create_target_field_var(struct hist_trigger_data *target_hist_data,
- char *subsys_name, char *event_name, char *var_name)
- {
- struct trace_event_file *file = target_hist_data->event_file;
- if (subsys_name) {
- struct trace_event_call *call;
- if (!event_name)
- return NULL;
- call = file->event_call;
- if (strcmp(subsys_name, call->class->system) != 0)
- return NULL;
- if (strcmp(event_name, trace_event_name(call)) != 0)
- return NULL;
- }
- return create_field_var(target_hist_data, file, var_name);
- }
- static void onmax_print(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt,
- struct action_data *data)
- {
- unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx;
- seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx));
- for (i = 0; i < hist_data->n_max_vars; i++) {
- struct hist_field *save_val = hist_data->max_vars[i]->val;
- struct hist_field *save_var = hist_data->max_vars[i]->var;
- u64 val;
- save_var_idx = save_var->var.idx;
- val = tracing_map_read_var(elt, save_var_idx);
- if (save_val->flags & HIST_FIELD_FL_STRING) {
- seq_printf(m, " %s: %-32s", save_var->var.name,
- (char *)(uintptr_t)(val));
- } else
- seq_printf(m, " %s: %10llu", save_var->var.name, val);
- }
- }
- static void onmax_save(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
- struct action_data *data, u64 *var_ref_vals)
- {
- unsigned int max_idx = data->onmax.max_var->var.idx;
- unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx;
- u64 var_val, max_val;
- var_val = var_ref_vals[max_var_ref_idx];
- max_val = tracing_map_read_var(elt, max_idx);
- if (var_val <= max_val)
- return;
- tracing_map_set_var(elt, max_idx, var_val);
- update_max_vars(hist_data, elt, rbe, rec);
- }
- static void onmax_destroy(struct action_data *data)
- {
- unsigned int i;
- destroy_hist_field(data->onmax.max_var, 0);
- destroy_hist_field(data->onmax.var, 0);
- kfree(data->onmax.var_str);
- kfree(data->onmax.fn_name);
- for (i = 0; i < data->n_params; i++)
- kfree(data->params[i]);
- kfree(data);
- }
- static int onmax_create(struct hist_trigger_data *hist_data,
- struct action_data *data)
- {
- struct trace_event_file *file = hist_data->event_file;
- struct hist_field *var_field, *ref_field, *max_var;
- unsigned int var_ref_idx = hist_data->n_var_refs;
- struct field_var *field_var;
- char *onmax_var_str, *param;
- unsigned int i;
- int ret = 0;
- onmax_var_str = data->onmax.var_str;
- if (onmax_var_str[0] != '$') {
- hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str);
- return -EINVAL;
- }
- onmax_var_str++;
- var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str);
- if (!var_field) {
- hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str);
- return -EINVAL;
- }
- ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
- if (!ref_field)
- return -ENOMEM;
- data->onmax.var = ref_field;
- data->fn = onmax_save;
- data->onmax.max_var_ref_idx = var_ref_idx;
- max_var = create_var(hist_data, file, "max", sizeof(u64), "u64");
- if (IS_ERR(max_var)) {
- hist_err("onmax: Couldn't create onmax variable: ", "max");
- ret = PTR_ERR(max_var);
- goto out;
- }
- data->onmax.max_var = max_var;
- for (i = 0; i < data->n_params; i++) {
- param = kstrdup(data->params[i], GFP_KERNEL);
- if (!param) {
- ret = -ENOMEM;
- goto out;
- }
- field_var = create_target_field_var(hist_data, NULL, NULL, param);
- if (IS_ERR(field_var)) {
- hist_err("onmax: Couldn't create field variable: ", param);
- ret = PTR_ERR(field_var);
- kfree(param);
- goto out;
- }
- hist_data->max_vars[hist_data->n_max_vars++] = field_var;
- if (field_var->val->flags & HIST_FIELD_FL_STRING)
- hist_data->n_max_var_str++;
- kfree(param);
- }
- out:
- return ret;
- }
- static int parse_action_params(char *params, struct action_data *data)
- {
- char *param, *saved_param;
- int ret = 0;
- while (params) {
- if (data->n_params >= SYNTH_FIELDS_MAX)
- goto out;
- param = strsep(¶ms, ",");
- if (!param) {
- ret = -EINVAL;
- goto out;
- }
- param = strstrip(param);
- if (strlen(param) < 2) {
- hist_err("Invalid action param: ", param);
- ret = -EINVAL;
- goto out;
- }
- saved_param = kstrdup(param, GFP_KERNEL);
- if (!saved_param) {
- ret = -ENOMEM;
- goto out;
- }
- data->params[data->n_params++] = saved_param;
- }
- out:
- return ret;
- }
- static struct action_data *onmax_parse(char *str)
- {
- char *onmax_fn_name, *onmax_var_str;
- struct action_data *data;
- int ret = -EINVAL;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return ERR_PTR(-ENOMEM);
- onmax_var_str = strsep(&str, ")");
- if (!onmax_var_str || !str) {
- ret = -EINVAL;
- goto free;
- }
- data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL);
- if (!data->onmax.var_str) {
- ret = -ENOMEM;
- goto free;
- }
- strsep(&str, ".");
- if (!str)
- goto free;
- onmax_fn_name = strsep(&str, "(");
- if (!onmax_fn_name || !str)
- goto free;
- if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) {
- char *params = strsep(&str, ")");
- if (!params) {
- ret = -EINVAL;
- goto free;
- }
- ret = parse_action_params(params, data);
- if (ret)
- goto free;
- } else
- goto free;
- data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL);
- if (!data->onmax.fn_name) {
- ret = -ENOMEM;
- goto free;
- }
- out:
- return data;
- free:
- onmax_destroy(data);
- data = ERR_PTR(ret);
- goto out;
- }
- static void onmatch_destroy(struct action_data *data)
- {
- unsigned int i;
- mutex_lock(&synth_event_mutex);
- kfree(data->onmatch.match_event);
- kfree(data->onmatch.match_event_system);
- kfree(data->onmatch.synth_event_name);
- for (i = 0; i < data->n_params; i++)
- kfree(data->params[i]);
- if (data->onmatch.synth_event)
- data->onmatch.synth_event->ref--;
- kfree(data);
- mutex_unlock(&synth_event_mutex);
- }
- static void destroy_field_var(struct field_var *field_var)
- {
- if (!field_var)
- return;
- destroy_hist_field(field_var->var, 0);
- destroy_hist_field(field_var->val, 0);
- kfree(field_var);
- }
- static void destroy_field_vars(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_field_vars; i++)
- destroy_field_var(hist_data->field_vars[i]);
- }
- static void save_field_var(struct hist_trigger_data *hist_data,
- struct field_var *field_var)
- {
- hist_data->field_vars[hist_data->n_field_vars++] = field_var;
- if (field_var->val->flags & HIST_FIELD_FL_STRING)
- hist_data->n_field_var_str++;
- }
- static void destroy_synth_var_refs(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_synth_var_refs; i++)
- destroy_hist_field(hist_data->synth_var_refs[i], 0);
- }
- static void save_synth_var_ref(struct hist_trigger_data *hist_data,
- struct hist_field *var_ref)
- {
- hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref;
- }
- static int check_synth_field(struct synth_event *event,
- struct hist_field *hist_field,
- unsigned int field_pos)
- {
- struct synth_field *field;
- if (field_pos >= event->n_fields)
- return -EINVAL;
- field = event->fields[field_pos];
- if (strcmp(field->type, hist_field->type) != 0)
- return -EINVAL;
- return 0;
- }
- static struct hist_field *
- onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
- char *system, char *event, char *var)
- {
- struct hist_field *hist_field;
- var++; /* skip '$' */
- hist_field = find_target_event_var(hist_data, system, event, var);
- if (!hist_field) {
- if (!system) {
- system = data->onmatch.match_event_system;
- event = data->onmatch.match_event;
- }
- hist_field = find_event_var(hist_data, system, event, var);
- }
- if (!hist_field)
- hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var);
- return hist_field;
- }
- static struct hist_field *
- onmatch_create_field_var(struct hist_trigger_data *hist_data,
- struct action_data *data, char *system,
- char *event, char *var)
- {
- struct hist_field *hist_field = NULL;
- struct field_var *field_var;
- /*
- * First try to create a field var on the target event (the
- * currently being defined). This will create a variable for
- * unqualified fields on the target event, or if qualified,
- * target fields that have qualified names matching the target.
- */
- field_var = create_target_field_var(hist_data, system, event, var);
- if (field_var && !IS_ERR(field_var)) {
- save_field_var(hist_data, field_var);
- hist_field = field_var->var;
- } else {
- field_var = NULL;
- /*
- * If no explicit system.event is specfied, default to
- * looking for fields on the onmatch(system.event.xxx)
- * event.
- */
- if (!system) {
- system = data->onmatch.match_event_system;
- event = data->onmatch.match_event;
- }
- /*
- * At this point, we're looking at a field on another
- * event. Because we can't modify a hist trigger on
- * another event to add a variable for a field, we need
- * to create a new trigger on that event and create the
- * variable at the same time.
- */
- hist_field = create_field_var_hist(hist_data, system, event, var);
- if (IS_ERR(hist_field))
- goto free;
- }
- out:
- return hist_field;
- free:
- destroy_field_var(field_var);
- hist_field = NULL;
- goto out;
- }
- static int onmatch_create(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- struct action_data *data)
- {
- char *event_name, *param, *system = NULL;
- struct hist_field *hist_field, *var_ref;
- unsigned int i, var_ref_idx;
- unsigned int field_pos = 0;
- struct synth_event *event;
- int ret = 0;
- mutex_lock(&synth_event_mutex);
- event = find_synth_event(data->onmatch.synth_event_name);
- if (!event) {
- hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name);
- mutex_unlock(&synth_event_mutex);
- return -EINVAL;
- }
- event->ref++;
- mutex_unlock(&synth_event_mutex);
- var_ref_idx = hist_data->n_var_refs;
- for (i = 0; i < data->n_params; i++) {
- char *p;
- p = param = kstrdup(data->params[i], GFP_KERNEL);
- if (!param) {
- ret = -ENOMEM;
- goto err;
- }
- system = strsep(¶m, ".");
- if (!param) {
- param = (char *)system;
- system = event_name = NULL;
- } else {
- event_name = strsep(¶m, ".");
- if (!param) {
- kfree(p);
- ret = -EINVAL;
- goto err;
- }
- }
- if (param[0] == '$')
- hist_field = onmatch_find_var(hist_data, data, system,
- event_name, param);
- else
- hist_field = onmatch_create_field_var(hist_data, data,
- system,
- event_name,
- param);
- if (!hist_field) {
- kfree(p);
- ret = -EINVAL;
- goto err;
- }
- if (check_synth_field(event, hist_field, field_pos) == 0) {
- var_ref = create_var_ref(hist_data, hist_field,
- system, event_name);
- if (!var_ref) {
- kfree(p);
- ret = -ENOMEM;
- goto err;
- }
- save_synth_var_ref(hist_data, var_ref);
- field_pos++;
- kfree(p);
- continue;
- }
- hist_err_event("onmatch: Param type doesn't match synthetic event field type: ",
- system, event_name, param);
- kfree(p);
- ret = -EINVAL;
- goto err;
- }
- if (field_pos != event->n_fields) {
- hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name);
- ret = -EINVAL;
- goto err;
- }
- data->fn = action_trace;
- data->onmatch.synth_event = event;
- data->onmatch.var_ref_idx = var_ref_idx;
- out:
- return ret;
- err:
- mutex_lock(&synth_event_mutex);
- event->ref--;
- mutex_unlock(&synth_event_mutex);
- goto out;
- }
- static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
- {
- char *match_event, *match_event_system;
- char *synth_event_name, *params;
- struct action_data *data;
- int ret = -EINVAL;
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return ERR_PTR(-ENOMEM);
- match_event = strsep(&str, ")");
- if (!match_event || !str) {
- hist_err("onmatch: Missing closing paren: ", match_event);
- goto free;
- }
- match_event_system = strsep(&match_event, ".");
- if (!match_event) {
- hist_err("onmatch: Missing subsystem for match event: ", match_event_system);
- goto free;
- }
- if (IS_ERR(event_file(tr, match_event_system, match_event))) {
- hist_err_event("onmatch: Invalid subsystem or event name: ",
- match_event_system, match_event, NULL);
- goto free;
- }
- data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL);
- if (!data->onmatch.match_event) {
- ret = -ENOMEM;
- goto free;
- }
- data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL);
- if (!data->onmatch.match_event_system) {
- ret = -ENOMEM;
- goto free;
- }
- strsep(&str, ".");
- if (!str) {
- hist_err("onmatch: Missing . after onmatch(): ", str);
- goto free;
- }
- synth_event_name = strsep(&str, "(");
- if (!synth_event_name || !str) {
- hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name);
- goto free;
- }
- data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL);
- if (!data->onmatch.synth_event_name) {
- ret = -ENOMEM;
- goto free;
- }
- params = strsep(&str, ")");
- if (!params || !str || (str && strlen(str))) {
- hist_err("onmatch: Missing closing paramlist paren: ", params);
- goto free;
- }
- ret = parse_action_params(params, data);
- if (ret)
- goto free;
- out:
- return data;
- free:
- onmatch_destroy(data);
- data = ERR_PTR(ret);
- goto out;
- }
- static int create_hitcount_val(struct hist_trigger_data *hist_data)
- {
- hist_data->fields[HITCOUNT_IDX] =
- create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL);
- if (!hist_data->fields[HITCOUNT_IDX])
- return -ENOMEM;
- hist_data->n_vals++;
- hist_data->n_fields++;
- 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 *var_name, char *field_str,
- unsigned long flags)
- {
- struct hist_field *hist_field;
- int ret = 0;
- hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0);
- if (IS_ERR(hist_field)) {
- ret = PTR_ERR(hist_field);
- goto out;
- }
- hist_data->fields[val_idx] = hist_field;
- ++hist_data->n_vals;
- ++hist_data->n_fields;
- if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
- ret = -EINVAL;
- out:
- return ret;
- }
- static int create_val_field(struct hist_trigger_data *hist_data,
- unsigned int val_idx,
- struct trace_event_file *file,
- char *field_str)
- {
- if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
- return -EINVAL;
- return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
- }
- static int create_var_field(struct hist_trigger_data *hist_data,
- unsigned int val_idx,
- struct trace_event_file *file,
- char *var_name, char *expr_str)
- {
- unsigned long flags = 0;
- if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
- return -EINVAL;
- if (find_var(hist_data, file, var_name) && !hist_data->remove) {
- hist_err("Variable already defined: ", var_name);
- return -EINVAL;
- }
- flags |= HIST_FIELD_FL_VAR;
- hist_data->n_vars++;
- if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
- return -EINVAL;
- return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
- }
- 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 = 1;
- 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 hist_field *hist_field = NULL;
- unsigned long flags = 0;
- unsigned int key_size;
- int ret = 0;
- if (WARN_ON(key_idx >= HIST_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;
- hist_field = create_hist_field(hist_data, NULL, flags, NULL);
- } else {
- hist_field = parse_expr(hist_data, file, field_str, flags,
- NULL, 0);
- if (IS_ERR(hist_field)) {
- ret = PTR_ERR(hist_field);
- goto out;
- }
- if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- hist_err("Using variable references as keys not supported: ", field_str);
- destroy_hist_field(hist_field, 0);
- ret = -EINVAL;
- goto out;
- }
- key_size = hist_field->size;
- }
- hist_data->fields[key_idx] = hist_field;
- 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++;
- hist_data->n_fields++;
- 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_var_fields(struct hist_trigger_data *hist_data,
- struct trace_event_file *file)
- {
- unsigned int i, j = hist_data->n_vals;
- int ret = 0;
- unsigned int n_vars = hist_data->attrs->var_defs.n_vars;
- for (i = 0; i < n_vars; i++) {
- char *var_name = hist_data->attrs->var_defs.name[i];
- char *expr = hist_data->attrs->var_defs.expr[i];
- ret = create_var_field(hist_data, j++, file, var_name, expr);
- if (ret)
- goto out;
- }
- out:
- return ret;
- }
- static void free_var_defs(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
- kfree(hist_data->attrs->var_defs.name[i]);
- kfree(hist_data->attrs->var_defs.expr[i]);
- }
- hist_data->attrs->var_defs.n_vars = 0;
- }
- static int parse_var_defs(struct hist_trigger_data *hist_data)
- {
- char *s, *str, *var_name, *field_str;
- unsigned int i, j, n_vars = 0;
- int ret = 0;
- for (i = 0; i < hist_data->attrs->n_assignments; i++) {
- str = hist_data->attrs->assignment_str[i];
- for (j = 0; j < TRACING_MAP_VARS_MAX; j++) {
- field_str = strsep(&str, ",");
- if (!field_str)
- break;
- var_name = strsep(&field_str, "=");
- if (!var_name || !field_str) {
- hist_err("Malformed assignment: ", var_name);
- ret = -EINVAL;
- goto free;
- }
- if (n_vars == TRACING_MAP_VARS_MAX) {
- hist_err("Too many variables defined: ", var_name);
- ret = -EINVAL;
- goto free;
- }
- s = kstrdup(var_name, GFP_KERNEL);
- if (!s) {
- ret = -ENOMEM;
- goto free;
- }
- hist_data->attrs->var_defs.name[n_vars] = s;
- s = kstrdup(field_str, GFP_KERNEL);
- if (!s) {
- kfree(hist_data->attrs->var_defs.name[n_vars]);
- ret = -ENOMEM;
- goto free;
- }
- hist_data->attrs->var_defs.expr[n_vars++] = s;
- hist_data->attrs->var_defs.n_vars = n_vars;
- }
- }
- return ret;
- free:
- free_var_defs(hist_data);
- return ret;
- }
- static int create_hist_fields(struct hist_trigger_data *hist_data,
- struct trace_event_file *file)
- {
- int ret;
- ret = parse_var_defs(hist_data);
- if (ret)
- goto out;
- ret = create_val_fields(hist_data, file);
- if (ret)
- goto out;
- ret = create_var_fields(hist_data, file);
- if (ret)
- goto out;
- ret = create_key_fields(hist_data, file);
- if (ret)
- goto out;
- out:
- free_var_defs(hist_data);
- 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 tracing_map_sort_key *sort_key;
- int descending, ret = 0;
- unsigned int i, j, k;
- 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++) {
- struct hist_field *hist_field;
- char *field_str, *field_name;
- const char *test_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, k = 1; j < hist_data->n_fields; j++) {
- unsigned int idx;
- hist_field = hist_data->fields[j];
- if (hist_field->flags & HIST_FIELD_FL_VAR)
- continue;
- idx = k++;
- test_name = hist_field_name(hist_field, 0);
- if (strcmp(field_name, test_name) == 0) {
- sort_key->field_idx = idx;
- 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_actions(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_actions; i++) {
- struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace)
- onmatch_destroy(data);
- else if (data->fn == onmax_save)
- onmax_destroy(data);
- else
- kfree(data);
- }
- }
- static int parse_actions(struct hist_trigger_data *hist_data)
- {
- struct trace_array *tr = hist_data->event_file->tr;
- struct action_data *data;
- unsigned int i;
- int ret = 0;
- char *str;
- for (i = 0; i < hist_data->attrs->n_actions; i++) {
- str = hist_data->attrs->action_str[i];
- if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) {
- char *action_str = str + strlen("onmatch(");
- data = onmatch_parse(tr, action_str);
- if (IS_ERR(data)) {
- ret = PTR_ERR(data);
- break;
- }
- data->fn = action_trace;
- } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) {
- char *action_str = str + strlen("onmax(");
- data = onmax_parse(action_str);
- if (IS_ERR(data)) {
- ret = PTR_ERR(data);
- break;
- }
- data->fn = onmax_save;
- } else {
- ret = -EINVAL;
- break;
- }
- hist_data->actions[hist_data->n_actions++] = data;
- }
- return ret;
- }
- static int create_actions(struct hist_trigger_data *hist_data,
- struct trace_event_file *file)
- {
- struct action_data *data;
- unsigned int i;
- int ret = 0;
- for (i = 0; i < hist_data->attrs->n_actions; i++) {
- data = hist_data->actions[i];
- if (data->fn == action_trace) {
- ret = onmatch_create(hist_data, file, data);
- if (ret)
- return ret;
- } else if (data->fn == onmax_save) {
- ret = onmax_create(hist_data, data);
- if (ret)
- return ret;
- }
- }
- return ret;
- }
- static void print_actions(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_actions; i++) {
- struct action_data *data = hist_data->actions[i];
- if (data->fn == onmax_save)
- onmax_print(m, hist_data, elt, data);
- }
- }
- static void print_onmax_spec(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct action_data *data)
- {
- unsigned int i;
- seq_puts(m, ":onmax(");
- seq_printf(m, "%s", data->onmax.var_str);
- seq_printf(m, ").%s(", data->onmax.fn_name);
- for (i = 0; i < hist_data->n_max_vars; i++) {
- seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name);
- if (i < hist_data->n_max_vars - 1)
- seq_puts(m, ",");
- }
- seq_puts(m, ")");
- }
- static void print_onmatch_spec(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct action_data *data)
- {
- unsigned int i;
- seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,
- data->onmatch.match_event);
- seq_printf(m, "%s(", data->onmatch.synth_event->name);
- for (i = 0; i < data->n_params; i++) {
- if (i)
- seq_puts(m, ",");
- seq_printf(m, "%s", data->params[i]);
- }
- seq_puts(m, ")");
- }
- static bool actions_match(struct hist_trigger_data *hist_data,
- struct hist_trigger_data *hist_data_test)
- {
- unsigned int i, j;
- if (hist_data->n_actions != hist_data_test->n_actions)
- return false;
- for (i = 0; i < hist_data->n_actions; i++) {
- struct action_data *data = hist_data->actions[i];
- struct action_data *data_test = hist_data_test->actions[i];
- if (data->fn != data_test->fn)
- return false;
- if (data->n_params != data_test->n_params)
- return false;
- for (j = 0; j < data->n_params; j++) {
- if (strcmp(data->params[j], data_test->params[j]) != 0)
- return false;
- }
- if (data->fn == action_trace) {
- if (strcmp(data->onmatch.synth_event_name,
- data_test->onmatch.synth_event_name) != 0)
- return false;
- if (strcmp(data->onmatch.match_event_system,
- data_test->onmatch.match_event_system) != 0)
- return false;
- if (strcmp(data->onmatch.match_event,
- data_test->onmatch.match_event) != 0)
- return false;
- } else if (data->fn == onmax_save) {
- if (strcmp(data->onmax.var_str,
- data_test->onmax.var_str) != 0)
- return false;
- if (strcmp(data->onmax.fn_name,
- data_test->onmax.fn_name) != 0)
- return false;
- }
- }
- return true;
- }
- static void print_actions_spec(struct seq_file *m,
- struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_actions; i++) {
- struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace)
- print_onmatch_spec(m, hist_data, data);
- else if (data->fn == onmax_save)
- print_onmax_spec(m, hist_data, data);
- }
- }
- static void destroy_field_var_hists(struct hist_trigger_data *hist_data)
- {
- unsigned int i;
- for (i = 0; i < hist_data->n_field_var_hists; i++) {
- kfree(hist_data->field_var_hists[i]->cmd);
- kfree(hist_data->field_var_hists[i]);
- }
- }
- static void destroy_hist_data(struct hist_trigger_data *hist_data)
- {
- if (!hist_data)
- return;
- destroy_hist_trigger_attrs(hist_data->attrs);
- destroy_hist_fields(hist_data);
- tracing_map_destroy(hist_data->map);
- destroy_actions(hist_data);
- destroy_field_vars(hist_data);
- destroy_field_var_hists(hist_data);
- destroy_synth_var_refs(hist_data);
- 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 = 0;
- 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 (!field)
- cmp_fn = tracing_map_cmp_num(hist_field->size,
- hist_field->is_signed);
- 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 if (!(hist_field->flags & HIST_FIELD_FL_VAR))
- idx = tracing_map_add_sum_field(map);
- if (idx < 0)
- return idx;
- if (hist_field->flags & HIST_FIELD_FL_VAR) {
- idx = tracing_map_add_var(map);
- if (idx < 0)
- return idx;
- hist_field->var.idx = idx;
- hist_field->var.hist_data = hist_data;
- }
- }
- return 0;
- }
- static struct hist_trigger_data *
- create_hist_data(unsigned int map_bits,
- struct hist_trigger_attrs *attrs,
- struct trace_event_file *file,
- bool remove)
- {
- 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;
- hist_data->remove = remove;
- hist_data->event_file = file;
- ret = parse_actions(hist_data);
- if (ret)
- goto free;
- ret = create_hist_fields(hist_data, file);
- if (ret)
- goto free;
- ret = create_sort_keys(hist_data);
- if (ret)
- goto free;
- map_ops = &hist_trigger_elt_data_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;
- 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 ring_buffer_event *rbe,
- u64 *var_ref_vals)
- {
- struct hist_elt_data *elt_data;
- struct hist_field *hist_field;
- unsigned int i, var_idx;
- u64 hist_val;
- elt_data = elt->private_data;
- elt_data->var_ref_vals = var_ref_vals;
- for_each_hist_val_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- hist_val = hist_field->fn(hist_field, elt, rbe, rec);
- if (hist_field->flags & HIST_FIELD_FL_VAR) {
- var_idx = hist_field->var.idx;
- tracing_map_set_var(elt, var_idx, hist_val);
- continue;
- }
- tracing_map_update_sum(elt, i, hist_val);
- }
- for_each_hist_key_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- if (hist_field->flags & HIST_FIELD_FL_VAR) {
- hist_val = hist_field->fn(hist_field, elt, rbe, rec);
- var_idx = hist_field->var.idx;
- tracing_map_set_var(elt, var_idx, hist_val);
- }
- }
- update_field_vars(hist_data, elt, rbe, rec);
- }
- 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;
- strncpy(compound_key + key_field->offset, (char *)key, size);
- } else
- memcpy(compound_key + key_field->offset, key, size);
- }
- static void
- hist_trigger_actions(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe, u64 *var_ref_vals)
- {
- struct action_data *data;
- unsigned int i;
- for (i = 0; i < hist_data->n_actions; i++) {
- data = hist_data->actions[i];
- data->fn(hist_data, elt, rec, rbe, data, var_ref_vals);
- }
- }
- static void event_hist_trigger(struct event_trigger_data *data, void *rec,
- struct ring_buffer_event *rbe)
- {
- struct hist_trigger_data *hist_data = data->private_data;
- bool use_compound_key = (hist_data->n_keys > 1);
- unsigned long entries[HIST_STACKTRACE_DEPTH];
- u64 var_ref_vals[TRACING_MAP_VARS_MAX];
- char compound_key[HIST_KEY_SIZE_MAX];
- struct tracing_map_elt *elt = NULL;
- struct stack_trace stacktrace;
- struct hist_field *key_field;
- 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, elt, rbe, 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;
- if (hist_data->n_var_refs &&
- !resolve_var_refs(hist_data, key, var_ref_vals, false))
- return;
- elt = tracing_map_insert(hist_data->map, key);
- if (!elt)
- return;
- hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
- if (resolve_var_refs(hist_data, key, var_ref_vals, true))
- hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals);
- }
- 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;
- const char *field_name;
- 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, ", ");
- field_name = hist_field_name(key_field, 0);
- if (key_field->flags & HIST_FIELD_FL_HEX) {
- uval = *(u64 *)(key + key_field->offset);
- seq_printf(m, "%s: %llx", 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", 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", field_name,
- uval, str);
- } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
- struct hist_elt_data *elt_data = elt->private_data;
- char *comm;
- if (WARN_ON_ONCE(!elt_data))
- return;
- comm = elt_data->comm;
- uval = *(u64 *)(key + key_field->offset);
- seq_printf(m, "%s: %-16s[%10llu]", 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]", 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", field_name,
- *(u64 *)(key + key_field->offset));
- } else if (key_field->flags & HIST_FIELD_FL_STRING) {
- seq_printf(m, "%s: %-50s", field_name,
- (char *)(key + key_field->offset));
- } else {
- uval = *(u64 *)(key + key_field->offset);
- seq_printf(m, "%s: %10llu", 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++) {
- field_name = hist_field_name(hist_data->fields[i], 0);
- if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR ||
- hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR)
- continue;
- if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
- seq_printf(m, " %s: %10llx", field_name,
- tracing_map_read_sum(elt, i));
- } else {
- seq_printf(m, " %s: %10llu", field_name,
- tracing_map_read_sum(elt, i));
- }
- }
- print_actions(m, hist_data, elt);
- 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;
- 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)
- 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(data, &event_file->triggers, list) {
- if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
- hist_trigger_show(m, data, n++);
- }
- if (have_hist_err()) {
- seq_printf(m, "\nERROR: %s\n", hist_err_str);
- seq_printf(m, " Last command: %s\n", last_hist_cmd);
- }
- 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 void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
- {
- const char *field_name = hist_field_name(hist_field, 0);
- if (hist_field->var.name)
- seq_printf(m, "%s=", hist_field->var.name);
- if (hist_field->flags & HIST_FIELD_FL_CPU)
- seq_puts(m, "cpu");
- else if (field_name) {
- if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
- hist_field->flags & HIST_FIELD_FL_ALIAS)
- seq_putc(m, '$');
- seq_printf(m, "%s", field_name);
- } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
- seq_puts(m, "common_timestamp");
- if (hist_field->flags) {
- if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
- !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
- const char *flags = get_hist_field_flags(hist_field);
- if (flags)
- seq_printf(m, ".%s", flags);
- }
- }
- }
- 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 *field;
- bool have_var = false;
- 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) {
- field = hist_data->fields[i];
- if (i > hist_data->n_vals)
- seq_puts(m, ",");
- if (field->flags & HIST_FIELD_FL_STACKTRACE)
- seq_puts(m, "stacktrace");
- else
- hist_field_print(m, field);
- }
- seq_puts(m, ":vals=");
- for_each_hist_val_field(i, hist_data) {
- field = hist_data->fields[i];
- if (field->flags & HIST_FIELD_FL_VAR) {
- have_var = true;
- continue;
- }
- if (i == HITCOUNT_IDX)
- seq_puts(m, "hitcount");
- else {
- seq_puts(m, ",");
- hist_field_print(m, field);
- }
- }
- if (have_var) {
- unsigned int n = 0;
- seq_puts(m, ":");
- for_each_hist_val_field(i, hist_data) {
- field = hist_data->fields[i];
- if (field->flags & HIST_FIELD_FL_VAR) {
- if (n++)
- seq_puts(m, ",");
- hist_field_print(m, field);
- }
- }
- }
- seq_puts(m, ":sort=");
- for (i = 0; i < hist_data->n_sort_keys; i++) {
- struct tracing_map_sort_key *sort_key;
- unsigned int idx, first_key_idx;
- /* skip VAR vals */
- first_key_idx = hist_data->n_vals - hist_data->n_vars;
- sort_key = &hist_data->sort_keys[i];
- idx = sort_key->field_idx;
- if (WARN_ON(idx >= HIST_FIELDS_MAX))
- return -EINVAL;
- if (i > 0)
- seq_puts(m, ",");
- if (idx == HITCOUNT_IDX)
- seq_puts(m, "hitcount");
- else {
- if (idx >= first_key_idx)
- idx += hist_data->n_vars;
- 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 (hist_data->enable_timestamps)
- seq_printf(m, ":clock=%s", hist_data->attrs->clock);
- print_actions_spec(m, hist_data);
- 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 unregister_field_var_hists(struct hist_trigger_data *hist_data)
- {
- struct trace_event_file *file;
- unsigned int i;
- char *cmd;
- int ret;
- for (i = 0; i < hist_data->n_field_var_hists; i++) {
- file = hist_data->field_var_hists[i]->hist_data->event_file;
- cmd = hist_data->field_var_hists[i]->cmd;
- ret = event_hist_trigger_func(&trigger_hist_cmd, file,
- "!hist", "hist", cmd);
- }
- }
- 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);
- remove_hist_vars(hist_data);
- unregister_field_var_hists(hist_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);
- tracepoint_synchronize_unregister();
- 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;
- if (key_field->size != key_field_test->size)
- return false;
- if (key_field->is_signed != key_field_test->is_signed)
- return false;
- if (!!key_field->var.name != !!key_field_test->var.name)
- return false;
- if (key_field->var.name &&
- strcmp(key_field->var.name, key_field_test->var.name) != 0)
- 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;
- if (!actions_match(hist_data, hist_data_test))
- 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)) {
- hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name);
- ret = -EINVAL;
- goto out;
- }
- }
- }
- if (hist_data->attrs->name && !named_data)
- goto new;
- lockdep_assert_held(&event_mutex);
- list_for_each_entry(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 {
- hist_err("Hist trigger already exists", NULL);
- ret = -EEXIST;
- }
- goto out;
- }
- }
- new:
- if (hist_data->attrs->cont || hist_data->attrs->clear) {
- hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
- ret = -ENOENT;
- goto out;
- }
- if (hist_data->attrs->pause)
- data->paused = true;
- if (named_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;
- }
- if (hist_data->enable_timestamps) {
- char *clock = hist_data->attrs->clock;
- ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
- if (ret) {
- hist_err("Couldn't set trace_clock: ", clock);
- goto out;
- }
- tracing_set_time_stamp_abs(file->tr, true);
- }
- if (named_data)
- destroy_hist_data(hist_data);
- ret++;
- out:
- return ret;
- }
- static int hist_trigger_enable(struct event_trigger_data *data,
- struct trace_event_file *file)
- {
- int ret = 0;
- list_add_tail_rcu(&data->list, &file->triggers);
- update_cond_flag(file);
- if (trace_event_trigger_enable_disable(file, 1) < 0) {
- list_del_rcu(&data->list);
- update_cond_flag(file);
- ret--;
- }
- return ret;
- }
- static bool have_hist_trigger_match(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 match = false;
- lockdep_assert_held(&event_mutex);
- if (hist_data->attrs->name)
- named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (hist_trigger_match(data, test, named_data, false)) {
- match = true;
- break;
- }
- }
- }
- return match;
- }
- static bool hist_trigger_check_refs(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;
- lockdep_assert_held(&event_mutex);
- if (hist_data->attrs->name)
- named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (!hist_trigger_match(data, test, named_data, false))
- continue;
- hist_data = test->private_data;
- if (check_var_refs(hist_data))
- return true;
- break;
- }
- }
- return false;
- }
- 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;
- lockdep_assert_held(&event_mutex);
- if (hist_data->attrs->name)
- named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry(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);
- if (hist_data->enable_timestamps) {
- if (!hist_data->remove || unregistered)
- tracing_set_time_stamp_abs(file->tr, false);
- }
- }
- static bool hist_file_check_refs(struct trace_event_file *file)
- {
- struct hist_trigger_data *hist_data;
- struct event_trigger_data *test;
- lockdep_assert_held(&event_mutex);
- list_for_each_entry(test, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- hist_data = test->private_data;
- if (check_var_refs(hist_data))
- return true;
- }
- }
- return false;
- }
- static void hist_unreg_all(struct trace_event_file *file)
- {
- struct event_trigger_data *test, *n;
- struct hist_trigger_data *hist_data;
- struct synth_event *se;
- const char *se_name;
- if (hist_file_check_refs(file))
- return;
- list_for_each_entry_safe(test, n, &file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- hist_data = test->private_data;
- list_del_rcu(&test->list);
- trace_event_trigger_enable_disable(file, 0);
- mutex_lock(&synth_event_mutex);
- se_name = trace_event_name(file->event_call);
- se = find_synth_event(se_name);
- if (se)
- se->ref--;
- mutex_unlock(&synth_event_mutex);
- update_cond_flag(file);
- if (hist_data->enable_timestamps)
- tracing_set_time_stamp_abs(file->tr, false);
- 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;
- struct synth_event *se;
- const char *se_name;
- bool remove = false;
- char *trigger, *p;
- int ret = 0;
- if (glob && strlen(glob)) {
- last_cmd_set(param);
- hist_err_clear();
- }
- if (!param)
- return -EINVAL;
- if (glob[0] == '!')
- remove = true;
- /*
- * separate the trigger from the filter (k:v [if filter])
- * allowing for whitespace in the trigger
- */
- p = trigger = param;
- do {
- p = strstr(p, "if");
- if (!p)
- break;
- if (p == param)
- return -EINVAL;
- if (*(p - 1) != ' ' && *(p - 1) != '\t') {
- p++;
- continue;
- }
- if (p >= param + strlen(param) - strlen("if") - 1)
- return -EINVAL;
- if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') {
- p++;
- continue;
- }
- break;
- } while (p);
- if (!p)
- param = NULL;
- else {
- *(p - 1) = '\0';
- param = strstrip(p);
- trigger = strstrip(trigger);
- }
- 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, remove);
- if (IS_ERR(hist_data)) {
- destroy_hist_trigger_attrs(attrs);
- return PTR_ERR(hist_data);
- }
- trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
- trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
- if (!trigger_data) {
- ret = -ENOMEM;
- 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 (remove) {
- if (!have_hist_trigger_match(trigger_data, file))
- goto out_free;
- if (hist_trigger_check_refs(trigger_data, file)) {
- ret = -EBUSY;
- goto out_free;
- }
- cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
- mutex_lock(&synth_event_mutex);
- se_name = trace_event_name(file->event_call);
- se = find_synth_event(se_name);
- if (se)
- se->ref--;
- mutex_unlock(&synth_event_mutex);
- 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;
- if (get_named_trigger_data(trigger_data))
- goto enable;
- if (has_hist_vars(hist_data))
- save_hist_vars(hist_data);
- ret = create_actions(hist_data, file);
- if (ret)
- goto out_unreg;
- ret = tracing_map_init(hist_data->map);
- if (ret)
- goto out_unreg;
- enable:
- ret = hist_trigger_enable(trigger_data, file);
- if (ret)
- goto out_unreg;
- mutex_lock(&synth_event_mutex);
- se_name = trace_event_name(file->event_call);
- se = find_synth_event(se_name);
- if (se)
- se->ref++;
- mutex_unlock(&synth_event_mutex);
- /* Just return zero, not the number of registered triggers */
- ret = 0;
- out:
- if (ret == 0)
- hist_err_clear();
- return ret;
- out_unreg:
- cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
- out_free:
- if (cmd_ops->set_filter)
- cmd_ops->set_filter(NULL, trigger_data, NULL);
- remove_hist_vars(hist_data);
- 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 ring_buffer_event *event)
- {
- 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,
- struct ring_buffer_event *event)
- {
- if (!data->count)
- return;
- if (data->count != -1)
- (data->count)--;
- hist_enable_trigger(data, rec, event);
- }
- 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;
- }
- static __init int trace_events_hist_init(void)
- {
- struct dentry *entry = NULL;
- struct dentry *d_tracer;
- int err = 0;
- d_tracer = tracing_init_dentry();
- if (IS_ERR(d_tracer)) {
- err = PTR_ERR(d_tracer);
- goto err;
- }
- entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
- NULL, &synth_events_fops);
- if (!entry) {
- err = -ENODEV;
- goto err;
- }
- return err;
- err:
- pr_warn("Could not create tracefs 'synthetic_events' entry\n");
- return err;
- }
- fs_initcall(trace_events_hist_init);
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