| /* |
| * trace_events_hist - trace event hist triggers |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * 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 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 |
| strncpy(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; |
| |
| 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 { |
| entry->fields[n_u64] = var_ref_vals[var_ref_idx + i]; |
| 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(char *field_type, |
| char *field_name) |
| { |
| struct synth_field *field; |
| int len, ret = 0; |
| char *array; |
| |
| if (field_type[0] == ';') |
| field_type++; |
| |
| 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); |
| field->type = kzalloc(len, GFP_KERNEL); |
| if (!field->type) { |
| ret = -ENOMEM; |
| goto free; |
| } |
| 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(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(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 { |
| mutex_lock(&synth_event_mutex); |
| if (!find_synth_event(event->name)) |
| list_add(&event->list, &synth_event_list); |
| else |
| free_synth_event(event); |
| mutex_unlock(&synth_event_mutex); |
| } |
| } |
| |
| 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, n_fields = 0, ret = 0; |
| char *name; |
| |
| 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) |
| 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(argv[i], argv[i + 1]); |
| if (IS_ERR(field)) { |
| ret = PTR_ERR(field); |
| goto err; |
| } |
| fields[n_fields] = field; |
| i++; n_fields++; |
| } |
| |
| if (i < argc) { |
| 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: |
| mutex_unlock(&synth_event_mutex); |
| |
| 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); |
| } |
| } |
| |
| return ret; |
| err: |
| mutex_unlock(&synth_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 list_head release_events; |
| struct synth_event *event, *e; |
| int ret = 0; |
| |
| INIT_LIST_HEAD(&release_events); |
| |
| 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_splice_init(&event->list, &release_events); |
| |
| mutex_unlock(&synth_event_mutex); |
| |
| list_for_each_entry_safe(event, e, &release_events, list) { |
| list_del(&event->list); |
| |
| ret = unregister_synth_event(event); |
| add_or_delete_synth_event(event, !ret); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| |
| hist_field = find_var_field(hist_data, var_name); |
| if (hist_field) |
| return hist_field; |
| |
| list_for_each_entry_rcu(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; |
| |
| list_for_each_entry_rcu(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; |
| |
| 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 destroy_hist_field(struct hist_field *hist_field, |
| unsigned int level) |
| { |
| unsigned int i; |
| |
| if (level > 3) |
| return; |
| |
| if (!hist_field) |
| return; |
| |
| for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) |
| destroy_hist_field(hist_field->operands[i], level + 1); |
| |
| kfree(hist_field->var.name); |
| kfree(hist_field->name); |
| kfree(hist_field->type); |
| |
| kfree(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->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; |
| } |
| } |
| } |
| |
| 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; |
| } |
| |
| static struct hist_field *create_var_ref(struct hist_field *var_field, |
| char *system, char *event_name) |
| { |
| unsigned long flags = HIST_FIELD_FL_VAR_REF; |
| struct hist_field *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; |
| } |
| } |
| |
| 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(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 { |
| 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) { |
| 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; |
| } |
| |
| 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) { |
| hist_data->var_refs[hist_data->n_var_refs] = hist_field; |
| hist_field->var_ref_idx = hist_data->n_var_refs++; |
| 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; |
| |
| list_for_each_entry_rcu(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; |
| |
| n_keys = target_hist_data->n_fields - target_hist_data->n_vals; |
| |
| list_for_each_entry_rcu(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 long flags; |
| 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; |
| } |
| |
| flags = HIST_FIELD_FL_VAR_REF; |
| ref_field = create_hist_field(hist_data, NULL, flags, NULL); |
| if (!ref_field) |
| return -ENOMEM; |
| |
| if (init_var_ref(ref_field, var_field, NULL, NULL)) { |
| destroy_hist_field(ref_field, 0); |
| ret = -ENOMEM; |
| goto out; |
| } |
| hist_data->var_refs[hist_data->n_var_refs] = ref_field; |
| ref_field->var_ref_idx = hist_data->n_var_refs++; |
| 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; |
| |
| hist_data->var_refs[hist_data->n_var_refs] = var_ref; |
| var_ref->var_ref_idx = hist_data->n_var_refs++; |
| } |
| |
| 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_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; |
| } |
| |
| 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_rcu(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"); |
| } |
| |
| 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); |
| |
| synchronize_sched(); |
| |
| tracing_map_clear(hist_data->map); |
| |
| if (data->name) |
| unpause_named_trigger(data); |
| } |
| |
| static bool compatible_field(struct ftrace_event_field *field, |
| struct ftrace_event_field *test_field) |
| { |
| if (field == test_field) |
| return true; |
| if (field == NULL || test_field == NULL) |
| return false; |
| if (strcmp(field->name, test_field->name) != 0) |
| return false; |
| if (strcmp(field->type, test_field->type) != 0) |
| return false; |
| if (field->size != test_field->size) |
| return false; |
| if (field->is_signed != test_field->is_signed) |
| return false; |
| |
| return true; |
| } |
| |
| static bool hist_trigger_match(struct event_trigger_data *data, |
| struct event_trigger_data *data_test, |
| struct event_trigger_data *named_data, |
| bool ignore_filter) |
| { |
| struct tracing_map_sort_key *sort_key, *sort_key_test; |
| struct hist_trigger_data *hist_data, *hist_data_test; |
| struct hist_field *key_field, *key_field_test; |
| unsigned int i; |
| |
| if (named_data && (named_data != data_test) && |
| (named_data != data_test->named_data)) |
| return false; |
| |
| if (!named_data && is_named_trigger(data_test)) |
| return false; |
| |
| hist_data = data->private_data; |
| hist_data_test = data_test->private_data; |
| |
| if (hist_data->n_vals != hist_data_test->n_vals || |
| hist_data->n_fields != hist_data_test->n_fields || |
| hist_data->n_sort_keys != hist_data_test->n_sort_keys) |
| return false; |
| |
| if (!ignore_filter) { |
| if ((data->filter_str && !data_test->filter_str) || |
| (!data->filter_str && data_test->filter_str)) |
| return false; |
| } |
| |
| for_each_hist_field(i, hist_data) { |
| key_field = hist_data->fields[i]; |
| key_field_test = hist_data_test->fields[i]; |
| |
| if (key_field->flags != key_field_test->flags) |
| return false; |
| if (!compatible_field(key_field->field, key_field_test->field)) |
| return false; |
| if (key_field->offset != key_field_test->offset) |
| return false; |
| 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; |
| |
| list_for_each_entry_rcu(test, &file->triggers, list) { |
| if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
| if (!hist_trigger_match(data, test, named_data, false)) |
| continue; |
| if (hist_data->attrs->pause) |
| test->paused = true; |
| else if (hist_data->attrs->cont) |
| test->paused = false; |
| else if (hist_data->attrs->clear) |
| hist_clear(test); |
| else { |
| 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; |
| |
| if (hist_data->attrs->name) |
| named_data = find_named_trigger(hist_data->attrs->name); |
| |
| list_for_each_entry_rcu(test, &file->triggers, list) { |
| if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
| if (hist_trigger_match(data, test, named_data, false)) { |
| 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; |
| |
| if (hist_data->attrs->name) |
| named_data = find_named_trigger(hist_data->attrs->name); |
| |
| list_for_each_entry_rcu(test, &file->triggers, list) { |
| if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
| if (!hist_trigger_match(data, test, named_data, false)) |
| continue; |
| 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; |
| |
| if (hist_data->attrs->name) |
| named_data = find_named_trigger(hist_data->attrs->name); |
| |
| list_for_each_entry_rcu(test, &file->triggers, list) { |
| if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { |
| if (!hist_trigger_match(data, test, named_data, false)) |
| continue; |
| unregistered = true; |
| list_del_rcu(&test->list); |
| trace_event_trigger_enable_disable(file, 0); |
| update_cond_flag(file); |
| break; |
| } |
| } |
| |
| if (unregistered && test->ops->free) |
| test->ops->free(test->ops, test); |
| |
| 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; |
| |
| list_for_each_entry_rcu(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); |