// SPDX-License-Identifier: GPL-2.0
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/*
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* trace_events_hist - trace event hist triggers
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*
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* Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
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*/
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/security.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/stacktrace.h>
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#include <linux/rculist.h>
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#include <linux/tracefs.h>
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/* for gfp flag names */
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#include <linux/trace_events.h>
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#include <trace/events/mmflags.h>
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#include "tracing_map.h"
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#include "trace_synth.h"
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#define ERRORS \
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C(NONE, "No error"), \
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C(DUPLICATE_VAR, "Variable already defined"), \
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C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
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C(TOO_MANY_VARS, "Too many variables defined"), \
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C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
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C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
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C(TRIGGER_EEXIST, "Hist trigger already exists"), \
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C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
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C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
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C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
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C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
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C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
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C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
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C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
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C(HIST_NOT_FOUND, "Matching event histogram not found"), \
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C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
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C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
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C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
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C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
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C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
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C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
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C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
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C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
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C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
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C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
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C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
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C(TOO_MANY_PARAMS, "Too many action params"), \
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C(PARAM_NOT_FOUND, "Couldn't find param"), \
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C(INVALID_PARAM, "Invalid action param"), \
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C(ACTION_NOT_FOUND, "No action found"), \
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C(NO_SAVE_PARAMS, "No params found for save()"), \
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C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
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C(ACTION_MISMATCH, "Handler doesn't support action"), \
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C(NO_CLOSING_PAREN, "No closing paren found"), \
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C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
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C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
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C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
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C(VAR_NOT_FOUND, "Couldn't find variable"), \
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C(FIELD_NOT_FOUND, "Couldn't find field"), \
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C(EMPTY_ASSIGNMENT, "Empty assignment"), \
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C(INVALID_SORT_MODIFIER,"Invalid sort modifier"), \
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C(EMPTY_SORT_FIELD, "Empty sort field"), \
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C(TOO_MANY_SORT_FIELDS, "Too many sort fields (Max = 2)"), \
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C(INVALID_SORT_FIELD, "Sort field must be a key or a val"), \
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C(INVALID_STR_OPERAND, "String type can not be an operand in expression"),
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#undef C
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#define C(a, b) HIST_ERR_##a
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enum { ERRORS };
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#undef C
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#define C(a, b) b
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static const char *err_text[] = { ERRORS };
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struct hist_field;
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typedef u64 (*hist_field_fn_t) (struct hist_field *field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event);
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#define HIST_FIELD_OPERANDS_MAX 2
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#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
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#define HIST_ACTIONS_MAX 8
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enum field_op_id {
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FIELD_OP_NONE,
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FIELD_OP_PLUS,
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FIELD_OP_MINUS,
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FIELD_OP_UNARY_MINUS,
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};
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/*
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* A hist_var (histogram variable) contains variable information for
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* hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
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* flag set. A hist_var has a variable name e.g. ts0, and is
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* associated with a given histogram trigger, as specified by
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* hist_data. The hist_var idx is the unique index assigned to the
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* variable by the hist trigger's tracing_map. The idx is what is
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* used to set a variable's value and, by a variable reference, to
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* retrieve it.
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*/
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struct hist_var {
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char *name;
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struct hist_trigger_data *hist_data;
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unsigned int idx;
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};
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struct hist_field {
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struct ftrace_event_field *field;
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unsigned long flags;
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hist_field_fn_t fn;
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unsigned int ref;
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unsigned int size;
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unsigned int offset;
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unsigned int is_signed;
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const char *type;
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struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
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struct hist_trigger_data *hist_data;
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/*
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* Variable fields contain variable-specific info in var.
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*/
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struct hist_var var;
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enum field_op_id operator;
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char *system;
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char *event_name;
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/*
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* The name field is used for EXPR and VAR_REF fields. VAR
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* fields contain the variable name in var.name.
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*/
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char *name;
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/*
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* When a histogram trigger is hit, if it has any references
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* to variables, the values of those variables are collected
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* into a var_ref_vals array by resolve_var_refs(). The
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* current value of each variable is read from the tracing_map
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* using the hist field's hist_var.idx and entered into the
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* var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
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*/
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unsigned int var_ref_idx;
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bool read_once;
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unsigned int var_str_idx;
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};
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static u64 hist_field_none(struct hist_field *field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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return 0;
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}
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static u64 hist_field_counter(struct hist_field *field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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return 1;
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}
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static u64 hist_field_string(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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char *addr = (char *)(event + hist_field->field->offset);
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return (u64)(unsigned long)addr;
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}
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static u64 hist_field_dynstring(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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u32 str_item = *(u32 *)(event + hist_field->field->offset);
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int str_loc = str_item & 0xffff;
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char *addr = (char *)(event + str_loc);
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return (u64)(unsigned long)addr;
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}
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static u64 hist_field_pstring(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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char **addr = (char **)(event + hist_field->field->offset);
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return (u64)(unsigned long)*addr;
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}
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static u64 hist_field_log2(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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struct hist_field *operand = hist_field->operands[0];
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u64 val = operand->fn(operand, elt, rbe, event);
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return (u64) ilog2(roundup_pow_of_two(val));
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}
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static u64 hist_field_plus(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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struct hist_field *operand1 = hist_field->operands[0];
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struct hist_field *operand2 = hist_field->operands[1];
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u64 val1 = operand1->fn(operand1, elt, rbe, event);
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u64 val2 = operand2->fn(operand2, elt, rbe, event);
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return val1 + val2;
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}
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static u64 hist_field_minus(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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struct hist_field *operand1 = hist_field->operands[0];
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struct hist_field *operand2 = hist_field->operands[1];
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u64 val1 = operand1->fn(operand1, elt, rbe, event);
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u64 val2 = operand2->fn(operand2, elt, rbe, event);
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return val1 - val2;
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}
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static u64 hist_field_unary_minus(struct hist_field *hist_field,
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struct tracing_map_elt *elt,
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struct ring_buffer_event *rbe,
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void *event)
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{
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struct hist_field *operand = hist_field->operands[0];
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s64 sval = (s64)operand->fn(operand, elt, rbe, event);
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u64 val = (u64)-sval;
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return val;
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}
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#define DEFINE_HIST_FIELD_FN(type) \
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static u64 hist_field_##type(struct hist_field *hist_field, \
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struct tracing_map_elt *elt, \
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struct ring_buffer_event *rbe, \
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void *event) \
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{ \
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type *addr = (type *)(event + hist_field->field->offset); \
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\
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return (u64)(unsigned long)*addr; \
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}
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DEFINE_HIST_FIELD_FN(s64);
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DEFINE_HIST_FIELD_FN(u64);
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DEFINE_HIST_FIELD_FN(s32);
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DEFINE_HIST_FIELD_FN(u32);
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DEFINE_HIST_FIELD_FN(s16);
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DEFINE_HIST_FIELD_FN(u16);
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DEFINE_HIST_FIELD_FN(s8);
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DEFINE_HIST_FIELD_FN(u8);
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#define for_each_hist_field(i, hist_data) \
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for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
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#define for_each_hist_val_field(i, hist_data) \
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for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
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#define for_each_hist_key_field(i, hist_data) \
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for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
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#define HIST_STACKTRACE_DEPTH 16
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#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
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#define HIST_STACKTRACE_SKIP 5
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#define HITCOUNT_IDX 0
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#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
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enum hist_field_flags {
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HIST_FIELD_FL_HITCOUNT = 1 << 0,
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HIST_FIELD_FL_KEY = 1 << 1,
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HIST_FIELD_FL_STRING = 1 << 2,
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HIST_FIELD_FL_HEX = 1 << 3,
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HIST_FIELD_FL_SYM = 1 << 4,
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HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
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HIST_FIELD_FL_EXECNAME = 1 << 6,
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HIST_FIELD_FL_SYSCALL = 1 << 7,
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HIST_FIELD_FL_STACKTRACE = 1 << 8,
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HIST_FIELD_FL_LOG2 = 1 << 9,
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HIST_FIELD_FL_TIMESTAMP = 1 << 10,
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HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11,
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HIST_FIELD_FL_VAR = 1 << 12,
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HIST_FIELD_FL_EXPR = 1 << 13,
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HIST_FIELD_FL_VAR_REF = 1 << 14,
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HIST_FIELD_FL_CPU = 1 << 15,
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HIST_FIELD_FL_ALIAS = 1 << 16,
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};
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struct var_defs {
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unsigned int n_vars;
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char *name[TRACING_MAP_VARS_MAX];
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char *expr[TRACING_MAP_VARS_MAX];
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};
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struct hist_trigger_attrs {
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char *keys_str;
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char *vals_str;
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char *sort_key_str;
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char *name;
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char *clock;
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bool pause;
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bool cont;
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bool clear;
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bool ts_in_usecs;
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unsigned int map_bits;
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char *assignment_str[TRACING_MAP_VARS_MAX];
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unsigned int n_assignments;
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char *action_str[HIST_ACTIONS_MAX];
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unsigned int n_actions;
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struct var_defs var_defs;
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};
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struct field_var {
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struct hist_field *var;
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struct hist_field *val;
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};
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struct field_var_hist {
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struct hist_trigger_data *hist_data;
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char *cmd;
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};
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struct hist_trigger_data {
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struct hist_field *fields[HIST_FIELDS_MAX];
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unsigned int n_vals;
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unsigned int n_keys;
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unsigned int n_fields;
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unsigned int n_vars;
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unsigned int n_var_str;
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unsigned int key_size;
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struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
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unsigned int n_sort_keys;
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struct trace_event_file *event_file;
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struct hist_trigger_attrs *attrs;
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struct tracing_map *map;
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bool enable_timestamps;
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bool remove;
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struct hist_field *var_refs[TRACING_MAP_VARS_MAX];
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unsigned int n_var_refs;
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struct action_data *actions[HIST_ACTIONS_MAX];
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unsigned int n_actions;
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struct field_var *field_vars[SYNTH_FIELDS_MAX];
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unsigned int n_field_vars;
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unsigned int n_field_var_str;
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struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
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unsigned int n_field_var_hists;
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struct field_var *save_vars[SYNTH_FIELDS_MAX];
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unsigned int n_save_vars;
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unsigned int n_save_var_str;
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};
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struct action_data;
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typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
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struct tracing_map_elt *elt, void *rec,
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struct ring_buffer_event *rbe, void *key,
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struct action_data *data, u64 *var_ref_vals);
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typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
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enum handler_id {
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HANDLER_ONMATCH = 1,
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HANDLER_ONMAX,
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HANDLER_ONCHANGE,
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};
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enum action_id {
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ACTION_SAVE = 1,
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ACTION_TRACE,
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ACTION_SNAPSHOT,
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};
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struct action_data {
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enum handler_id handler;
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enum action_id action;
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char *action_name;
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action_fn_t fn;
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unsigned int n_params;
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char *params[SYNTH_FIELDS_MAX];
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/*
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* When a histogram trigger is hit, the values of any
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* references to variables, including variables being passed
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* as parameters to synthetic events, are collected into a
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* var_ref_vals array. This var_ref_idx array is an array of
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* indices into the var_ref_vals array, one for each synthetic
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* event param, and is passed to the synthetic event
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* invocation.
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*/
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unsigned int var_ref_idx[TRACING_MAP_VARS_MAX];
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struct synth_event *synth_event;
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bool use_trace_keyword;
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char *synth_event_name;
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union {
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struct {
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char *event;
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char *event_system;
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} match_data;
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struct {
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/*
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* var_str contains the $-unstripped variable
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* name referenced by var_ref, and used when
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* printing the action. Because var_ref
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* creation is deferred to create_actions(),
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* we need a per-action way to save it until
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* then, thus var_str.
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*/
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char *var_str;
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/*
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* var_ref refers to the variable being
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* tracked e.g onmax($var).
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*/
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struct hist_field *var_ref;
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/*
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* track_var contains the 'invisible' tracking
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* variable created to keep the current
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* e.g. max value.
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*/
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struct hist_field *track_var;
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check_track_val_fn_t check_val;
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action_fn_t save_data;
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} track_data;
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};
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};
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struct track_data {
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u64 track_val;
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bool updated;
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unsigned int key_len;
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void *key;
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struct tracing_map_elt elt;
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struct action_data *action_data;
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struct hist_trigger_data *hist_data;
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};
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struct hist_elt_data {
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char *comm;
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u64 *var_ref_vals;
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char *field_var_str[SYNTH_FIELDS_MAX];
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};
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struct snapshot_context {
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struct tracing_map_elt *elt;
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void *key;
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};
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static void track_data_free(struct track_data *track_data)
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{
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struct hist_elt_data *elt_data;
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if (!track_data)
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return;
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kfree(track_data->key);
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elt_data = track_data->elt.private_data;
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if (elt_data) {
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kfree(elt_data->comm);
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kfree(elt_data);
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}
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kfree(track_data);
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}
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static struct track_data *track_data_alloc(unsigned int key_len,
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struct action_data *action_data,
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struct hist_trigger_data *hist_data)
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{
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struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
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struct hist_elt_data *elt_data;
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if (!data)
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return ERR_PTR(-ENOMEM);
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data->key = kzalloc(key_len, GFP_KERNEL);
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if (!data->key) {
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track_data_free(data);
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return ERR_PTR(-ENOMEM);
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}
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data->key_len = key_len;
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data->action_data = action_data;
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data->hist_data = hist_data;
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elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
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if (!elt_data) {
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track_data_free(data);
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return ERR_PTR(-ENOMEM);
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}
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data->elt.private_data = elt_data;
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elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
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if (!elt_data->comm) {
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track_data_free(data);
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return ERR_PTR(-ENOMEM);
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}
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return data;
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}
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static char last_cmd[MAX_FILTER_STR_VAL];
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static char last_cmd_loc[MAX_FILTER_STR_VAL];
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static int errpos(char *str)
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{
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return err_pos(last_cmd, str);
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}
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static void last_cmd_set(struct trace_event_file *file, char *str)
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{
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const char *system = NULL, *name = NULL;
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struct trace_event_call *call;
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if (!str)
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return;
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strcpy(last_cmd, "hist:");
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strncat(last_cmd, str, MAX_FILTER_STR_VAL - 1 - sizeof("hist:"));
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if (file) {
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call = file->event_call;
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system = call->class->system;
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if (system) {
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name = trace_event_name(call);
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if (!name)
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system = NULL;
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}
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}
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if (system)
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snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
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}
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static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
|
{
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tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
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err_type, err_pos);
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}
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static void hist_err_clear(void)
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{
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last_cmd[0] = '\0';
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last_cmd_loc[0] = '\0';
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}
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typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals,
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unsigned int *var_ref_idx);
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static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
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unsigned int *var_ref_idx)
|
{
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struct tracepoint *tp = event->tp;
|
|
if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
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struct tracepoint_func *probe_func_ptr;
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synth_probe_func_t probe_func;
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void *__data;
|
|
if (!(cpu_online(raw_smp_processor_id())))
|
return;
|
|
probe_func_ptr = rcu_dereference_sched((tp)->funcs);
|
if (probe_func_ptr) {
|
do {
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probe_func = probe_func_ptr->func;
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__data = probe_func_ptr->data;
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probe_func(__data, var_ref_vals, var_ref_idx);
|
} while ((++probe_func_ptr)->func);
|
}
|
}
|
}
|
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static void action_trace(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
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struct ring_buffer_event *rbe, void *key,
|
struct action_data *data, u64 *var_ref_vals)
|
{
|
struct synth_event *event = data->synth_event;
|
|
trace_synth(event, var_ref_vals, data->var_ref_idx);
|
}
|
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struct hist_var_data {
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struct list_head list;
|
struct hist_trigger_data *hist_data;
|
};
|
|
static u64 hist_field_timestamp(struct hist_field *hist_field,
|
struct tracing_map_elt *elt,
|
struct ring_buffer_event *rbe,
|
void *event)
|
{
|
struct hist_trigger_data *hist_data = hist_field->hist_data;
|
struct trace_array *tr = hist_data->event_file->tr;
|
|
u64 ts = ring_buffer_event_time_stamp(rbe);
|
|
if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr))
|
ts = ns2usecs(ts);
|
|
return ts;
|
}
|
|
static u64 hist_field_cpu(struct hist_field *hist_field,
|
struct tracing_map_elt *elt,
|
struct ring_buffer_event *rbe,
|
void *event)
|
{
|
int cpu = smp_processor_id();
|
|
return cpu;
|
}
|
|
/**
|
* check_field_for_var_ref - Check if a VAR_REF field references a variable
|
* @hist_field: The VAR_REF field to check
|
* @var_data: The hist trigger that owns the variable
|
* @var_idx: The trigger variable identifier
|
*
|
* Check the given VAR_REF field to see whether or not it references
|
* the given variable associated with the given trigger.
|
*
|
* Return: The VAR_REF field if it does reference the variable, NULL if not
|
*/
|
static struct hist_field *
|
check_field_for_var_ref(struct hist_field *hist_field,
|
struct hist_trigger_data *var_data,
|
unsigned int var_idx)
|
{
|
WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
|
|
if (hist_field && hist_field->var.idx == var_idx &&
|
hist_field->var.hist_data == var_data)
|
return hist_field;
|
|
return NULL;
|
}
|
|
/**
|
* find_var_ref - Check if a trigger has a reference to a trigger variable
|
* @hist_data: The hist trigger that might have a reference to the variable
|
* @var_data: The hist trigger that owns the variable
|
* @var_idx: The trigger variable identifier
|
*
|
* Check the list of var_refs[] on the first hist trigger to see
|
* whether any of them are references to the variable on the second
|
* trigger.
|
*
|
* Return: The VAR_REF field referencing the variable if so, NULL if not
|
*/
|
static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
|
struct hist_trigger_data *var_data,
|
unsigned int var_idx)
|
{
|
struct hist_field *hist_field;
|
unsigned int i;
|
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
hist_field = hist_data->var_refs[i];
|
if (check_field_for_var_ref(hist_field, var_data, var_idx))
|
return hist_field;
|
}
|
|
return NULL;
|
}
|
|
/**
|
* find_any_var_ref - Check if there is a reference to a given trigger variable
|
* @hist_data: The hist trigger
|
* @var_idx: The trigger variable identifier
|
*
|
* Check to see whether the given variable is currently referenced by
|
* any other trigger.
|
*
|
* The trigger the variable is defined on is explicitly excluded - the
|
* assumption being that a self-reference doesn't prevent a trigger
|
* from being removed.
|
*
|
* Return: The VAR_REF field referencing the variable if so, NULL if not
|
*/
|
static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
|
unsigned int var_idx)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_field *found = NULL;
|
struct hist_var_data *var_data;
|
|
list_for_each_entry(var_data, &tr->hist_vars, list) {
|
if (var_data->hist_data == hist_data)
|
continue;
|
found = find_var_ref(var_data->hist_data, hist_data, var_idx);
|
if (found)
|
break;
|
}
|
|
return found;
|
}
|
|
/**
|
* check_var_refs - Check if there is a reference to any of trigger's variables
|
* @hist_data: The hist trigger
|
*
|
* A trigger can define one or more variables. If any one of them is
|
* currently referenced by any other trigger, this function will
|
* determine that.
|
|
* Typically used to determine whether or not a trigger can be removed
|
* - if there are any references to a trigger's variables, it cannot.
|
*
|
* Return: True if there is a reference to any of trigger's variables
|
*/
|
static bool check_var_refs(struct hist_trigger_data *hist_data)
|
{
|
struct hist_field *field;
|
bool found = false;
|
int i;
|
|
for_each_hist_field(i, hist_data) {
|
field = hist_data->fields[i];
|
if (field && field->flags & HIST_FIELD_FL_VAR) {
|
if (find_any_var_ref(hist_data, field->var.idx)) {
|
found = true;
|
break;
|
}
|
}
|
}
|
|
return found;
|
}
|
|
static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_var_data *var_data, *found = NULL;
|
|
list_for_each_entry(var_data, &tr->hist_vars, list) {
|
if (var_data->hist_data == hist_data) {
|
found = var_data;
|
break;
|
}
|
}
|
|
return found;
|
}
|
|
static bool field_has_hist_vars(struct hist_field *hist_field,
|
unsigned int level)
|
{
|
int i;
|
|
if (level > 3)
|
return false;
|
|
if (!hist_field)
|
return false;
|
|
if (hist_field->flags & HIST_FIELD_FL_VAR ||
|
hist_field->flags & HIST_FIELD_FL_VAR_REF)
|
return true;
|
|
for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
|
struct hist_field *operand;
|
|
operand = hist_field->operands[i];
|
if (field_has_hist_vars(operand, level + 1))
|
return true;
|
}
|
|
return false;
|
}
|
|
static bool has_hist_vars(struct hist_trigger_data *hist_data)
|
{
|
struct hist_field *hist_field;
|
int i;
|
|
for_each_hist_field(i, hist_data) {
|
hist_field = hist_data->fields[i];
|
if (field_has_hist_vars(hist_field, 0))
|
return true;
|
}
|
|
return false;
|
}
|
|
static int save_hist_vars(struct hist_trigger_data *hist_data)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_var_data *var_data;
|
|
var_data = find_hist_vars(hist_data);
|
if (var_data)
|
return 0;
|
|
if (tracing_check_open_get_tr(tr))
|
return -ENODEV;
|
|
var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
|
if (!var_data) {
|
trace_array_put(tr);
|
return -ENOMEM;
|
}
|
|
var_data->hist_data = hist_data;
|
list_add(&var_data->list, &tr->hist_vars);
|
|
return 0;
|
}
|
|
static void remove_hist_vars(struct hist_trigger_data *hist_data)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_var_data *var_data;
|
|
var_data = find_hist_vars(hist_data);
|
if (!var_data)
|
return;
|
|
if (WARN_ON(check_var_refs(hist_data)))
|
return;
|
|
list_del(&var_data->list);
|
|
kfree(var_data);
|
|
trace_array_put(tr);
|
}
|
|
static struct hist_field *find_var_field(struct hist_trigger_data *hist_data,
|
const char *var_name)
|
{
|
struct hist_field *hist_field, *found = NULL;
|
int i;
|
|
for_each_hist_field(i, hist_data) {
|
hist_field = hist_data->fields[i];
|
if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR &&
|
strcmp(hist_field->var.name, var_name) == 0) {
|
found = hist_field;
|
break;
|
}
|
}
|
|
return found;
|
}
|
|
static struct hist_field *find_var(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file,
|
const char *var_name)
|
{
|
struct hist_trigger_data *test_data;
|
struct event_trigger_data *test;
|
struct hist_field *hist_field;
|
|
lockdep_assert_held(&event_mutex);
|
|
hist_field = find_var_field(hist_data, var_name);
|
if (hist_field)
|
return hist_field;
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
test_data = test->private_data;
|
hist_field = find_var_field(test_data, var_name);
|
if (hist_field)
|
return hist_field;
|
}
|
}
|
|
return NULL;
|
}
|
|
static struct trace_event_file *find_var_file(struct trace_array *tr,
|
char *system,
|
char *event_name,
|
char *var_name)
|
{
|
struct hist_trigger_data *var_hist_data;
|
struct hist_var_data *var_data;
|
struct trace_event_file *file, *found = NULL;
|
|
if (system)
|
return find_event_file(tr, system, event_name);
|
|
list_for_each_entry(var_data, &tr->hist_vars, list) {
|
var_hist_data = var_data->hist_data;
|
file = var_hist_data->event_file;
|
if (file == found)
|
continue;
|
|
if (find_var_field(var_hist_data, var_name)) {
|
if (found) {
|
hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
|
return NULL;
|
}
|
|
found = file;
|
}
|
}
|
|
return found;
|
}
|
|
static struct hist_field *find_file_var(struct trace_event_file *file,
|
const char *var_name)
|
{
|
struct hist_trigger_data *test_data;
|
struct event_trigger_data *test;
|
struct hist_field *hist_field;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
test_data = test->private_data;
|
hist_field = find_var_field(test_data, var_name);
|
if (hist_field)
|
return hist_field;
|
}
|
}
|
|
return NULL;
|
}
|
|
static struct hist_field *
|
find_match_var(struct hist_trigger_data *hist_data, char *var_name)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_field *hist_field, *found = NULL;
|
struct trace_event_file *file;
|
unsigned int i;
|
|
for (i = 0; i < hist_data->n_actions; i++) {
|
struct action_data *data = hist_data->actions[i];
|
|
if (data->handler == HANDLER_ONMATCH) {
|
char *system = data->match_data.event_system;
|
char *event_name = data->match_data.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(tr, HIST_ERR_VAR_NOT_UNIQUE,
|
errpos(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;
|
}
|
|
static u64 hist_field_var_ref(struct hist_field *hist_field,
|
struct tracing_map_elt *elt,
|
struct ring_buffer_event *rbe,
|
void *event)
|
{
|
struct hist_elt_data *elt_data;
|
u64 var_val = 0;
|
|
if (WARN_ON_ONCE(!elt))
|
return var_val;
|
|
elt_data = elt->private_data;
|
var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
|
|
return var_val;
|
}
|
|
static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key,
|
u64 *var_ref_vals, bool self)
|
{
|
struct hist_trigger_data *var_data;
|
struct tracing_map_elt *var_elt;
|
struct hist_field *hist_field;
|
unsigned int i, var_idx;
|
bool resolved = true;
|
u64 var_val = 0;
|
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
hist_field = hist_data->var_refs[i];
|
var_idx = hist_field->var.idx;
|
var_data = hist_field->var.hist_data;
|
|
if (var_data == NULL) {
|
resolved = false;
|
break;
|
}
|
|
if ((self && var_data != hist_data) ||
|
(!self && var_data == hist_data))
|
continue;
|
|
var_elt = tracing_map_lookup(var_data->map, key);
|
if (!var_elt) {
|
resolved = false;
|
break;
|
}
|
|
if (!tracing_map_var_set(var_elt, var_idx)) {
|
resolved = false;
|
break;
|
}
|
|
if (self || !hist_field->read_once)
|
var_val = tracing_map_read_var(var_elt, var_idx);
|
else
|
var_val = tracing_map_read_var_once(var_elt, var_idx);
|
|
var_ref_vals[i] = var_val;
|
}
|
|
return resolved;
|
}
|
|
static const char *hist_field_name(struct hist_field *field,
|
unsigned int level)
|
{
|
const char *field_name = "";
|
|
if (level > 1)
|
return field_name;
|
|
if (field->field)
|
field_name = field->field->name;
|
else if (field->flags & HIST_FIELD_FL_LOG2 ||
|
field->flags & HIST_FIELD_FL_ALIAS)
|
field_name = hist_field_name(field->operands[0], ++level);
|
else if (field->flags & HIST_FIELD_FL_CPU)
|
field_name = "common_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;
|
|
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 ((str_has_prefix(str, "onmatch(")) ||
|
(str_has_prefix(str, "onmax(")) ||
|
(str_has_prefix(str, "onchange("))) {
|
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(struct trace_array *tr,
|
char *str, struct hist_trigger_attrs *attrs)
|
{
|
int len, ret = 0;
|
|
if ((len = str_has_prefix(str, "key=")) ||
|
(len = str_has_prefix(str, "keys="))) {
|
attrs->keys_str = kstrdup(str + len, GFP_KERNEL);
|
if (!attrs->keys_str) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
} else if ((len = str_has_prefix(str, "val=")) ||
|
(len = str_has_prefix(str, "vals=")) ||
|
(len = str_has_prefix(str, "values="))) {
|
attrs->vals_str = kstrdup(str + len, GFP_KERNEL);
|
if (!attrs->vals_str) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
} else if ((len = str_has_prefix(str, "sort="))) {
|
attrs->sort_key_str = kstrdup(str + len, GFP_KERNEL);
|
if (!attrs->sort_key_str) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
} else if (str_has_prefix(str, "name=")) {
|
attrs->name = kstrdup(str, GFP_KERNEL);
|
if (!attrs->name) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
} else if ((len = str_has_prefix(str, "clock="))) {
|
str += len;
|
|
str = strstrip(str);
|
attrs->clock = kstrdup(str, GFP_KERNEL);
|
if (!attrs->clock) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
} else if ((len = str_has_prefix(str, "size="))) {
|
int map_bits = parse_map_size(str + len);
|
|
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(tr, HIST_ERR_TOO_MANY_VARS, errpos(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(struct trace_array *tr, 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, ":");
|
char *rhs;
|
|
rhs = strchr(str, '=');
|
if (rhs) {
|
if (!strlen(++rhs)) {
|
ret = -EINVAL;
|
hist_err(tr, HIST_ERR_EMPTY_ASSIGNMENT, errpos(str));
|
goto free;
|
}
|
ret = parse_assignment(tr, 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;
|
}
|
|
strncpy(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_save_var_str +
|
hist_data->n_var_str;
|
if (n_str > SYNTH_FIELDS_MAX) {
|
hist_elt_data_free(elt_data);
|
return -EINVAL;
|
}
|
|
BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
|
|
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 '-':
|
/*
|
* Unfortunately, the modifier ".sym-offset"
|
* can confuse things.
|
*/
|
if (op - str >= 4 && !strncmp(op - 4, ".sym-offset", 11))
|
return FIELD_OP_NONE;
|
|
if (*str == '-')
|
field_op = FIELD_OP_UNARY_MINUS;
|
else
|
field_op = FIELD_OP_MINUS;
|
break;
|
case '+':
|
field_op = FIELD_OP_PLUS;
|
break;
|
default:
|
break;
|
}
|
|
return field_op;
|
}
|
|
static void get_hist_field(struct hist_field *hist_field)
|
{
|
hist_field->ref++;
|
}
|
|
static void __destroy_hist_field(struct hist_field *hist_field)
|
{
|
if (--hist_field->ref > 1)
|
return;
|
|
kfree(hist_field->var.name);
|
kfree(hist_field->name);
|
kfree(hist_field->type);
|
|
kfree(hist_field->system);
|
kfree(hist_field->event_name);
|
|
kfree(hist_field);
|
}
|
|
static void destroy_hist_field(struct hist_field *hist_field,
|
unsigned int level)
|
{
|
unsigned int i;
|
|
if (level > 3)
|
return;
|
|
if (!hist_field)
|
return;
|
|
if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
|
return; /* var refs will be destroyed separately */
|
|
for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
|
destroy_hist_field(hist_field->operands[i], level + 1);
|
|
__destroy_hist_field(hist_field);
|
}
|
|
static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
|
struct ftrace_event_field *field,
|
unsigned long flags,
|
char *var_name)
|
{
|
struct hist_field *hist_field;
|
|
if (field && is_function_field(field))
|
return NULL;
|
|
hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
|
if (!hist_field)
|
return NULL;
|
|
hist_field->ref = 1;
|
|
hist_field->hist_data = hist_data;
|
|
if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS)
|
goto out; /* caller will populate */
|
|
if (flags & HIST_FIELD_FL_VAR_REF) {
|
hist_field->fn = hist_field_var_ref;
|
goto out;
|
}
|
|
if (flags & HIST_FIELD_FL_HITCOUNT) {
|
hist_field->fn = hist_field_counter;
|
hist_field->size = sizeof(u64);
|
hist_field->type = kstrdup("u64", GFP_KERNEL);
|
if (!hist_field->type)
|
goto free;
|
goto out;
|
}
|
|
if (flags & HIST_FIELD_FL_STACKTRACE) {
|
hist_field->fn = hist_field_none;
|
goto out;
|
}
|
|
if (flags & HIST_FIELD_FL_LOG2) {
|
unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
|
hist_field->fn = hist_field_log2;
|
hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
|
hist_field->size = hist_field->operands[0]->size;
|
hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
|
if (!hist_field->type)
|
goto free;
|
goto out;
|
}
|
|
if (flags & HIST_FIELD_FL_TIMESTAMP) {
|
hist_field->fn = hist_field_timestamp;
|
hist_field->size = sizeof(u64);
|
hist_field->type = kstrdup("u64", GFP_KERNEL);
|
if (!hist_field->type)
|
goto free;
|
goto out;
|
}
|
|
if (flags & HIST_FIELD_FL_CPU) {
|
hist_field->fn = hist_field_cpu;
|
hist_field->size = sizeof(int);
|
hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
|
if (!hist_field->type)
|
goto free;
|
goto out;
|
}
|
|
if (WARN_ON_ONCE(!field))
|
goto out;
|
|
/* Pointers to strings are just pointers and dangerous to dereference */
|
if (is_string_field(field) &&
|
(field->filter_type != FILTER_PTR_STRING)) {
|
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;
|
hist_field->size = field->size;
|
} else if (field->filter_type == FILTER_DYN_STRING)
|
hist_field->fn = hist_field_dynstring;
|
else
|
hist_field->fn = hist_field_pstring;
|
} else {
|
hist_field->size = field->size;
|
hist_field->is_signed = field->is_signed;
|
hist_field->type = kstrdup(field->type, GFP_KERNEL);
|
if (!hist_field->type)
|
goto free;
|
|
hist_field->fn = select_value_fn(field->size,
|
field->is_signed);
|
if (!hist_field->fn) {
|
destroy_hist_field(hist_field, 0);
|
return NULL;
|
}
|
}
|
out:
|
hist_field->field = field;
|
hist_field->flags = flags;
|
|
if (var_name) {
|
hist_field->var.name = kstrdup(var_name, GFP_KERNEL);
|
if (!hist_field->var.name)
|
goto free;
|
}
|
|
return hist_field;
|
free:
|
destroy_hist_field(hist_field, 0);
|
return NULL;
|
}
|
|
static void destroy_hist_fields(struct hist_trigger_data *hist_data)
|
{
|
unsigned int i;
|
|
for (i = 0; i < HIST_FIELDS_MAX; i++) {
|
if (hist_data->fields[i]) {
|
destroy_hist_field(hist_data->fields[i], 0);
|
hist_data->fields[i] = NULL;
|
}
|
}
|
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
|
__destroy_hist_field(hist_data->var_refs[i]);
|
hist_data->var_refs[i] = NULL;
|
}
|
}
|
|
static int init_var_ref(struct hist_field *ref_field,
|
struct hist_field *var_field,
|
char *system, char *event_name)
|
{
|
int err = 0;
|
|
ref_field->var.idx = var_field->var.idx;
|
ref_field->var.hist_data = var_field->hist_data;
|
ref_field->size = var_field->size;
|
ref_field->is_signed = var_field->is_signed;
|
ref_field->flags |= var_field->flags &
|
(HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
|
|
if (system) {
|
ref_field->system = kstrdup(system, GFP_KERNEL);
|
if (!ref_field->system)
|
return -ENOMEM;
|
}
|
|
if (event_name) {
|
ref_field->event_name = kstrdup(event_name, GFP_KERNEL);
|
if (!ref_field->event_name) {
|
err = -ENOMEM;
|
goto free;
|
}
|
}
|
|
if (var_field->var.name) {
|
ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL);
|
if (!ref_field->name) {
|
err = -ENOMEM;
|
goto free;
|
}
|
} else if (var_field->name) {
|
ref_field->name = kstrdup(var_field->name, GFP_KERNEL);
|
if (!ref_field->name) {
|
err = -ENOMEM;
|
goto free;
|
}
|
}
|
|
ref_field->type = kstrdup(var_field->type, GFP_KERNEL);
|
if (!ref_field->type) {
|
err = -ENOMEM;
|
goto free;
|
}
|
out:
|
return err;
|
free:
|
kfree(ref_field->system);
|
ref_field->system = NULL;
|
kfree(ref_field->event_name);
|
ref_field->event_name = NULL;
|
kfree(ref_field->name);
|
ref_field->name = NULL;
|
|
goto out;
|
}
|
|
static int find_var_ref_idx(struct hist_trigger_data *hist_data,
|
struct hist_field *var_field)
|
{
|
struct hist_field *ref_field;
|
int i;
|
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
ref_field = hist_data->var_refs[i];
|
if (ref_field->var.idx == var_field->var.idx &&
|
ref_field->var.hist_data == var_field->hist_data)
|
return i;
|
}
|
|
return -ENOENT;
|
}
|
|
/**
|
* create_var_ref - Create a variable reference and attach it to trigger
|
* @hist_data: The trigger that will be referencing the variable
|
* @var_field: The VAR field to create a reference to
|
* @system: The optional system string
|
* @event_name: The optional event_name string
|
*
|
* Given a variable hist_field, create a VAR_REF hist_field that
|
* represents a reference to it.
|
*
|
* This function also adds the reference to the trigger that
|
* now references the variable.
|
*
|
* Return: The VAR_REF field if successful, NULL if not
|
*/
|
static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
|
struct hist_field *var_field,
|
char *system, char *event_name)
|
{
|
unsigned long flags = HIST_FIELD_FL_VAR_REF;
|
struct hist_field *ref_field;
|
int i;
|
|
/* Check if the variable already exists */
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
ref_field = hist_data->var_refs[i];
|
if (ref_field->var.idx == var_field->var.idx &&
|
ref_field->var.hist_data == var_field->hist_data) {
|
get_hist_field(ref_field);
|
return ref_field;
|
}
|
}
|
|
ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL);
|
if (ref_field) {
|
if (init_var_ref(ref_field, var_field, system, event_name)) {
|
destroy_hist_field(ref_field, 0);
|
return NULL;
|
}
|
|
hist_data->var_refs[hist_data->n_var_refs] = ref_field;
|
ref_field->var_ref_idx = hist_data->n_var_refs++;
|
}
|
|
return ref_field;
|
}
|
|
static bool is_var_ref(char *var_name)
|
{
|
if (!var_name || strlen(var_name) < 2 || var_name[0] != '$')
|
return false;
|
|
return true;
|
}
|
|
static char *field_name_from_var(struct hist_trigger_data *hist_data,
|
char *var_name)
|
{
|
char *name, *field;
|
unsigned int i;
|
|
for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) {
|
name = hist_data->attrs->var_defs.name[i];
|
|
if (strcmp(var_name, name) == 0) {
|
field = hist_data->attrs->var_defs.expr[i];
|
if (contains_operator(field) || is_var_ref(field))
|
continue;
|
return field;
|
}
|
}
|
|
return NULL;
|
}
|
|
static char *local_field_var_ref(struct hist_trigger_data *hist_data,
|
char *system, char *event_name,
|
char *var_name)
|
{
|
struct trace_event_call *call;
|
|
if (system && event_name) {
|
call = hist_data->event_file->event_call;
|
|
if (strcmp(system, call->class->system) != 0)
|
return NULL;
|
|
if (strcmp(event_name, trace_event_name(call)) != 0)
|
return NULL;
|
}
|
|
if (!!system != !!event_name)
|
return NULL;
|
|
if (!is_var_ref(var_name))
|
return NULL;
|
|
var_name++;
|
|
return field_name_from_var(hist_data, var_name);
|
}
|
|
static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
|
char *system, char *event_name,
|
char *var_name)
|
{
|
struct hist_field *var_field = NULL, *ref_field = NULL;
|
struct trace_array *tr = hist_data->event_file->tr;
|
|
if (!is_var_ref(var_name))
|
return NULL;
|
|
var_name++;
|
|
var_field = find_event_var(hist_data, system, event_name, var_name);
|
if (var_field)
|
ref_field = create_var_ref(hist_data, var_field,
|
system, event_name);
|
|
if (!ref_field)
|
hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(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;
|
struct trace_array *tr = file->tr;
|
|
modifier = str = kstrdup(field_str, GFP_KERNEL);
|
if (!modifier)
|
return ERR_PTR(-ENOMEM);
|
|
field_name = strsep(&modifier, ".");
|
if (modifier) {
|
if (strcmp(modifier, "hex") == 0)
|
*flags |= HIST_FIELD_FL_HEX;
|
else if (strcmp(modifier, "sym") == 0)
|
*flags |= HIST_FIELD_FL_SYM;
|
else if (strcmp(modifier, "sym-offset") == 0)
|
*flags |= HIST_FIELD_FL_SYM_OFFSET;
|
else if ((strcmp(modifier, "execname") == 0) &&
|
(strcmp(field_name, "common_pid") == 0))
|
*flags |= HIST_FIELD_FL_EXECNAME;
|
else if (strcmp(modifier, "syscall") == 0)
|
*flags |= HIST_FIELD_FL_SYSCALL;
|
else if (strcmp(modifier, "log2") == 0)
|
*flags |= HIST_FIELD_FL_LOG2;
|
else if (strcmp(modifier, "usecs") == 0)
|
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
|
else {
|
hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
|
field = ERR_PTR(-EINVAL);
|
goto out;
|
}
|
}
|
|
if (strcmp(field_name, "common_timestamp") == 0) {
|
*flags |= HIST_FIELD_FL_TIMESTAMP;
|
hist_data->enable_timestamps = true;
|
if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
|
hist_data->attrs->ts_in_usecs = true;
|
} else if (strcmp(field_name, "common_cpu") == 0)
|
*flags |= HIST_FIELD_FL_CPU;
|
else {
|
field = trace_find_event_field(file->event_call, field_name);
|
if (!field || !field->size) {
|
/*
|
* For backward compatibility, if field_name
|
* was "cpu", then we treat this the same as
|
* common_cpu. This also works for "CPU".
|
*/
|
if (field && field->filter_type == FILTER_CPU) {
|
*flags |= HIST_FIELD_FL_CPU;
|
} else {
|
hist_err(tr, HIST_ERR_FIELD_NOT_FOUND,
|
errpos(field_name));
|
field = ERR_PTR(-EINVAL);
|
goto out;
|
}
|
}
|
}
|
out:
|
kfree(str);
|
|
return field;
|
}
|
|
static struct hist_field *create_alias(struct hist_trigger_data *hist_data,
|
struct hist_field *var_ref,
|
char *var_name)
|
{
|
struct hist_field *alias = NULL;
|
unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR;
|
|
alias = create_hist_field(hist_data, NULL, flags, var_name);
|
if (!alias)
|
return NULL;
|
|
alias->fn = var_ref->fn;
|
alias->operands[0] = var_ref;
|
|
if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) {
|
destroy_hist_field(alias, 0);
|
return NULL;
|
}
|
|
alias->var_ref_idx = var_ref->var_ref_idx;
|
|
return alias;
|
}
|
|
static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file, char *str,
|
unsigned long *flags, char *var_name)
|
{
|
char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str;
|
struct ftrace_event_field *field = NULL;
|
struct hist_field *hist_field = NULL;
|
int ret = 0;
|
|
s = strchr(str, '.');
|
if (s) {
|
s = strchr(++s, '.');
|
if (s) {
|
ref_system = strsep(&str, ".");
|
if (!str) {
|
ret = -EINVAL;
|
goto out;
|
}
|
ref_event = strsep(&str, ".");
|
if (!str) {
|
ret = -EINVAL;
|
goto out;
|
}
|
ref_var = str;
|
}
|
}
|
|
s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
|
if (!s) {
|
hist_field = parse_var_ref(hist_data, ref_system,
|
ref_event, ref_var);
|
if (hist_field) {
|
if (var_name) {
|
hist_field = create_alias(hist_data, hist_field, var_name);
|
if (!hist_field) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
}
|
return hist_field;
|
}
|
} else
|
str = s;
|
|
field = parse_field(hist_data, file, str, flags);
|
if (IS_ERR(field)) {
|
ret = PTR_ERR(field);
|
goto out;
|
}
|
|
hist_field = create_hist_field(hist_data, field, *flags, var_name);
|
if (!hist_field) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
return hist_field;
|
out:
|
return ERR_PTR(ret);
|
}
|
|
static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file,
|
char *str, unsigned long flags,
|
char *var_name, unsigned int level);
|
|
static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file,
|
char *str, unsigned long flags,
|
char *var_name, unsigned int level)
|
{
|
struct hist_field *operand1, *expr = NULL;
|
unsigned long operand_flags;
|
int ret = 0;
|
char *s;
|
|
/* we support only -(xxx) i.e. explicit parens required */
|
|
if (level > 3) {
|
hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(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;
|
}
|
if (operand1->flags & HIST_FIELD_FL_STRING) {
|
/* String type can not be the operand of unary operator. */
|
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
|
destroy_hist_field(operand1, 0);
|
ret = -EINVAL;
|
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->size = operand1->size;
|
expr->is_signed = operand1->is_signed;
|
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 trace_array *tr,
|
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(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
|
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(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(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;
|
}
|
if (operand1->flags & HIST_FIELD_FL_STRING) {
|
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str));
|
ret = -EINVAL;
|
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;
|
}
|
if (operand2->flags & HIST_FIELD_FL_STRING) {
|
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
|
ret = -EINVAL;
|
goto free;
|
}
|
|
ret = check_expr_operands(file->tr, 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;
|
|
/* The operand sizes should be the same, so just pick one */
|
expr->size = operand1->size;
|
expr->is_signed = operand1->is_signed;
|
|
expr->operator = field_op;
|
expr->name = expr_str(expr, 0);
|
expr->type = kstrdup(operand1->type, GFP_KERNEL);
|
if (!expr->type) {
|
ret = -ENOMEM;
|
goto free;
|
}
|
|
switch (field_op) {
|
case FIELD_OP_MINUS:
|
expr->fn = hist_field_minus;
|
break;
|
case FIELD_OP_PLUS:
|
expr->fn = hist_field_plus;
|
break;
|
default:
|
ret = -EINVAL;
|
goto free;
|
}
|
|
return expr;
|
free:
|
destroy_hist_field(operand1, 0);
|
destroy_hist_field(operand2, 0);
|
destroy_hist_field(expr, 0);
|
|
return ERR_PTR(ret);
|
}
|
|
static char *find_trigger_filter(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file)
|
{
|
struct event_trigger_data *test;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
if (test->private_data == hist_data)
|
return test->filter_str;
|
}
|
}
|
|
return NULL;
|
}
|
|
static struct event_command trigger_hist_cmd;
|
static int event_hist_trigger_func(struct event_command *cmd_ops,
|
struct trace_event_file *file,
|
char *glob, char *cmd, char *param);
|
|
static bool compatible_keys(struct hist_trigger_data *target_hist_data,
|
struct hist_trigger_data *hist_data,
|
unsigned int n_keys)
|
{
|
struct hist_field *target_hist_field, *hist_field;
|
unsigned int n, i, j;
|
|
if (hist_data->n_fields - hist_data->n_vals != n_keys)
|
return false;
|
|
i = hist_data->n_vals;
|
j = target_hist_data->n_vals;
|
|
for (n = 0; n < n_keys; n++) {
|
hist_field = hist_data->fields[i + n];
|
target_hist_field = target_hist_data->fields[j + n];
|
|
if (strcmp(hist_field->type, target_hist_field->type) != 0)
|
return false;
|
if (hist_field->size != target_hist_field->size)
|
return false;
|
if (hist_field->is_signed != target_hist_field->is_signed)
|
return false;
|
}
|
|
return true;
|
}
|
|
static struct hist_trigger_data *
|
find_compatible_hist(struct hist_trigger_data *target_hist_data,
|
struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data;
|
struct event_trigger_data *test;
|
unsigned int n_keys;
|
|
lockdep_assert_held(&event_mutex);
|
|
n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
hist_data = test->private_data;
|
|
if (compatible_keys(target_hist_data, hist_data, n_keys))
|
return hist_data;
|
}
|
}
|
|
return NULL;
|
}
|
|
static struct trace_event_file *event_file(struct trace_array *tr,
|
char *system, char *event_name)
|
{
|
struct trace_event_file *file;
|
|
file = __find_event_file(tr, system, event_name);
|
if (!file)
|
return ERR_PTR(-EINVAL);
|
|
return file;
|
}
|
|
static struct hist_field *
|
find_synthetic_field_var(struct hist_trigger_data *target_hist_data,
|
char *system, char *event_name, char *field_name)
|
{
|
struct hist_field *event_var;
|
char *synthetic_name;
|
|
synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL);
|
if (!synthetic_name)
|
return ERR_PTR(-ENOMEM);
|
|
strcpy(synthetic_name, "synthetic_");
|
strcat(synthetic_name, field_name);
|
|
event_var = find_event_var(target_hist_data, system, event_name, synthetic_name);
|
|
kfree(synthetic_name);
|
|
return event_var;
|
}
|
|
/**
|
* create_field_var_hist - Automatically create a histogram and var for a field
|
* @target_hist_data: The target hist trigger
|
* @subsys_name: Optional subsystem name
|
* @event_name: Optional event name
|
* @field_name: The name of the field (and the resulting variable)
|
*
|
* Hist trigger actions fetch data from variables, not directly from
|
* events. However, for convenience, users are allowed to directly
|
* specify an event field in an action, which will be automatically
|
* converted into a variable on their behalf.
|
|
* If a user specifies a field on an event that isn't the event the
|
* histogram currently being defined (the target event histogram), the
|
* only way that can be accomplished is if a new hist trigger is
|
* created and the field variable defined on that.
|
*
|
* This function creates a new histogram compatible with the target
|
* event (meaning a histogram with the same key as the target
|
* histogram), and creates a variable for the specified field, but
|
* with 'synthetic_' prepended to the variable name in order to avoid
|
* collision with normal field variables.
|
*
|
* Return: The variable created for the field.
|
*/
|
static struct hist_field *
|
create_field_var_hist(struct hist_trigger_data *target_hist_data,
|
char *subsys_name, char *event_name, char *field_name)
|
{
|
struct trace_array *tr = target_hist_data->event_file->tr;
|
struct hist_field *event_var = ERR_PTR(-EINVAL);
|
struct hist_trigger_data *hist_data;
|
unsigned int i, n, first = true;
|
struct field_var_hist *var_hist;
|
struct trace_event_file *file;
|
struct hist_field *key_field;
|
char *saved_filter;
|
char *cmd;
|
int ret;
|
|
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
|
hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
|
return ERR_PTR(-EINVAL);
|
}
|
|
file = event_file(tr, subsys_name, event_name);
|
|
if (IS_ERR(file)) {
|
hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(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(tr, HIST_ERR_HIST_NOT_FOUND, errpos(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(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(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(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(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;
|
unsigned int size;
|
|
size = min(val->size, STR_VAR_LEN_MAX);
|
strscpy(str, val_str, size);
|
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 save_track_data_vars(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
struct action_data *data, u64 *var_ref_vals)
|
{
|
__update_field_vars(elt, rbe, rec, hist_data->save_vars,
|
hist_data->n_save_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->ref = 1;
|
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 trace_array *tr = file->tr;
|
struct field_var *field_var;
|
int ret = 0;
|
|
if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
|
hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
|
ret = -EINVAL;
|
goto err;
|
}
|
|
val = parse_atom(hist_data, file, field_name, &flags, NULL);
|
if (IS_ERR(val)) {
|
hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(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(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(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 bool check_track_val_max(u64 track_val, u64 var_val)
|
{
|
if (var_val <= track_val)
|
return false;
|
|
return true;
|
}
|
|
static bool check_track_val_changed(u64 track_val, u64 var_val)
|
{
|
if (var_val == track_val)
|
return false;
|
|
return true;
|
}
|
|
static u64 get_track_val(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt,
|
struct action_data *data)
|
{
|
unsigned int track_var_idx = data->track_data.track_var->var.idx;
|
u64 track_val;
|
|
track_val = tracing_map_read_var(elt, track_var_idx);
|
|
return track_val;
|
}
|
|
static void save_track_val(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt,
|
struct action_data *data, u64 var_val)
|
{
|
unsigned int track_var_idx = data->track_data.track_var->var.idx;
|
|
tracing_map_set_var(elt, track_var_idx, var_val);
|
}
|
|
static void save_track_data(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
struct action_data *data, u64 *var_ref_vals)
|
{
|
if (data->track_data.save_data)
|
data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
|
}
|
|
static bool check_track_val(struct tracing_map_elt *elt,
|
struct action_data *data,
|
u64 var_val)
|
{
|
struct hist_trigger_data *hist_data;
|
u64 track_val;
|
|
hist_data = data->track_data.track_var->hist_data;
|
track_val = get_track_val(hist_data, elt, data);
|
|
return data->track_data.check_val(track_val, var_val);
|
}
|
|
#ifdef CONFIG_TRACER_SNAPSHOT
|
static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
|
{
|
/* called with tr->max_lock held */
|
struct track_data *track_data = tr->cond_snapshot->cond_data;
|
struct hist_elt_data *elt_data, *track_elt_data;
|
struct snapshot_context *context = cond_data;
|
struct action_data *action;
|
u64 track_val;
|
|
if (!track_data)
|
return false;
|
|
action = track_data->action_data;
|
|
track_val = get_track_val(track_data->hist_data, context->elt,
|
track_data->action_data);
|
|
if (!action->track_data.check_val(track_data->track_val, track_val))
|
return false;
|
|
track_data->track_val = track_val;
|
memcpy(track_data->key, context->key, track_data->key_len);
|
|
elt_data = context->elt->private_data;
|
track_elt_data = track_data->elt.private_data;
|
if (elt_data->comm)
|
strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
|
|
track_data->updated = true;
|
|
return true;
|
}
|
|
static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
struct action_data *data,
|
u64 *var_ref_vals)
|
{
|
struct trace_event_file *file = hist_data->event_file;
|
struct snapshot_context context;
|
|
context.elt = elt;
|
context.key = key;
|
|
tracing_snapshot_cond(file->tr, &context);
|
}
|
|
static void hist_trigger_print_key(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
void *key,
|
struct tracing_map_elt *elt);
|
|
static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
|
{
|
unsigned int i;
|
|
if (!hist_data->n_actions)
|
return NULL;
|
|
for (i = 0; i < hist_data->n_actions; i++) {
|
struct action_data *data = hist_data->actions[i];
|
|
if (data->action == ACTION_SNAPSHOT)
|
return data;
|
}
|
|
return NULL;
|
}
|
|
static void track_data_snapshot_print(struct seq_file *m,
|
struct hist_trigger_data *hist_data)
|
{
|
struct trace_event_file *file = hist_data->event_file;
|
struct track_data *track_data;
|
struct action_data *action;
|
|
track_data = tracing_cond_snapshot_data(file->tr);
|
if (!track_data)
|
return;
|
|
if (!track_data->updated)
|
return;
|
|
action = snapshot_action(hist_data);
|
if (!action)
|
return;
|
|
seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
|
seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
|
action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
|
action->track_data.var_str, track_data->track_val);
|
|
seq_puts(m, "\ttriggered by event with key: ");
|
hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
|
seq_putc(m, '\n');
|
}
|
#else
|
static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
|
{
|
return false;
|
}
|
static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
struct action_data *data,
|
u64 *var_ref_vals) {}
|
static void track_data_snapshot_print(struct seq_file *m,
|
struct hist_trigger_data *hist_data) {}
|
#endif /* CONFIG_TRACER_SNAPSHOT */
|
|
static void track_data_print(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt,
|
struct action_data *data)
|
{
|
u64 track_val = get_track_val(hist_data, elt, data);
|
unsigned int i, save_var_idx;
|
|
if (data->handler == HANDLER_ONMAX)
|
seq_printf(m, "\n\tmax: %10llu", track_val);
|
else if (data->handler == HANDLER_ONCHANGE)
|
seq_printf(m, "\n\tchanged: %10llu", track_val);
|
|
if (data->action == ACTION_SNAPSHOT)
|
return;
|
|
for (i = 0; i < hist_data->n_save_vars; i++) {
|
struct hist_field *save_val = hist_data->save_vars[i]->val;
|
struct hist_field *save_var = hist_data->save_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 ontrack_action(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
struct action_data *data, u64 *var_ref_vals)
|
{
|
u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
|
|
if (check_track_val(elt, data, var_val)) {
|
save_track_val(hist_data, elt, data, var_val);
|
save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
|
}
|
}
|
|
static void action_data_destroy(struct action_data *data)
|
{
|
unsigned int i;
|
|
lockdep_assert_held(&event_mutex);
|
|
kfree(data->action_name);
|
|
for (i = 0; i < data->n_params; i++)
|
kfree(data->params[i]);
|
|
if (data->synth_event)
|
data->synth_event->ref--;
|
|
kfree(data->synth_event_name);
|
|
kfree(data);
|
}
|
|
static void track_data_destroy(struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
struct trace_event_file *file = hist_data->event_file;
|
|
destroy_hist_field(data->track_data.track_var, 0);
|
|
if (data->action == ACTION_SNAPSHOT) {
|
struct track_data *track_data;
|
|
track_data = tracing_cond_snapshot_data(file->tr);
|
if (track_data && track_data->hist_data == hist_data) {
|
tracing_snapshot_cond_disable(file->tr);
|
track_data_free(track_data);
|
}
|
}
|
|
kfree(data->track_data.var_str);
|
|
action_data_destroy(data);
|
}
|
|
static int action_create(struct hist_trigger_data *hist_data,
|
struct action_data *data);
|
|
static int track_data_create(struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
struct hist_field *var_field, *ref_field, *track_var = NULL;
|
struct trace_event_file *file = hist_data->event_file;
|
struct trace_array *tr = file->tr;
|
char *track_data_var_str;
|
int ret = 0;
|
|
track_data_var_str = data->track_data.var_str;
|
if (track_data_var_str[0] != '$') {
|
hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
|
return -EINVAL;
|
}
|
track_data_var_str++;
|
|
var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
|
if (!var_field) {
|
hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
|
return -EINVAL;
|
}
|
|
ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
|
if (!ref_field)
|
return -ENOMEM;
|
|
data->track_data.var_ref = ref_field;
|
|
if (data->handler == HANDLER_ONMAX)
|
track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
|
if (IS_ERR(track_var)) {
|
hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
|
ret = PTR_ERR(track_var);
|
goto out;
|
}
|
|
if (data->handler == HANDLER_ONCHANGE)
|
track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
|
if (IS_ERR(track_var)) {
|
hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
|
ret = PTR_ERR(track_var);
|
goto out;
|
}
|
data->track_data.track_var = track_var;
|
|
ret = action_create(hist_data, data);
|
out:
|
return ret;
|
}
|
|
static int parse_action_params(struct trace_array *tr, char *params,
|
struct action_data *data)
|
{
|
char *param, *saved_param;
|
bool first_param = true;
|
int ret = 0;
|
|
while (params) {
|
if (data->n_params >= SYNTH_FIELDS_MAX) {
|
hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
|
goto out;
|
}
|
|
param = strsep(¶ms, ",");
|
if (!param) {
|
hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
|
ret = -EINVAL;
|
goto out;
|
}
|
|
param = strstrip(param);
|
if (strlen(param) < 2) {
|
hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
|
ret = -EINVAL;
|
goto out;
|
}
|
|
saved_param = kstrdup(param, GFP_KERNEL);
|
if (!saved_param) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
if (first_param && data->use_trace_keyword) {
|
data->synth_event_name = saved_param;
|
first_param = false;
|
continue;
|
}
|
first_param = false;
|
|
data->params[data->n_params++] = saved_param;
|
}
|
out:
|
return ret;
|
}
|
|
static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
|
enum handler_id handler)
|
{
|
char *action_name;
|
int ret = 0;
|
|
strsep(&str, ".");
|
if (!str) {
|
hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
|
ret = -EINVAL;
|
goto out;
|
}
|
|
action_name = strsep(&str, "(");
|
if (!action_name || !str) {
|
hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
|
ret = -EINVAL;
|
goto out;
|
}
|
|
if (str_has_prefix(action_name, "save")) {
|
char *params = strsep(&str, ")");
|
|
if (!params) {
|
hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
|
ret = -EINVAL;
|
goto out;
|
}
|
|
ret = parse_action_params(tr, params, data);
|
if (ret)
|
goto out;
|
|
if (handler == HANDLER_ONMAX)
|
data->track_data.check_val = check_track_val_max;
|
else if (handler == HANDLER_ONCHANGE)
|
data->track_data.check_val = check_track_val_changed;
|
else {
|
hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
|
ret = -EINVAL;
|
goto out;
|
}
|
|
data->track_data.save_data = save_track_data_vars;
|
data->fn = ontrack_action;
|
data->action = ACTION_SAVE;
|
} else if (str_has_prefix(action_name, "snapshot")) {
|
char *params = strsep(&str, ")");
|
|
if (!str) {
|
hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
|
ret = -EINVAL;
|
goto out;
|
}
|
|
if (handler == HANDLER_ONMAX)
|
data->track_data.check_val = check_track_val_max;
|
else if (handler == HANDLER_ONCHANGE)
|
data->track_data.check_val = check_track_val_changed;
|
else {
|
hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
|
ret = -EINVAL;
|
goto out;
|
}
|
|
data->track_data.save_data = save_track_data_snapshot;
|
data->fn = ontrack_action;
|
data->action = ACTION_SNAPSHOT;
|
} else {
|
char *params = strsep(&str, ")");
|
|
if (str_has_prefix(action_name, "trace"))
|
data->use_trace_keyword = true;
|
|
if (params) {
|
ret = parse_action_params(tr, params, data);
|
if (ret)
|
goto out;
|
}
|
|
if (handler == HANDLER_ONMAX)
|
data->track_data.check_val = check_track_val_max;
|
else if (handler == HANDLER_ONCHANGE)
|
data->track_data.check_val = check_track_val_changed;
|
|
if (handler != HANDLER_ONMATCH) {
|
data->track_data.save_data = action_trace;
|
data->fn = ontrack_action;
|
} else
|
data->fn = action_trace;
|
|
data->action = ACTION_TRACE;
|
}
|
|
data->action_name = kstrdup(action_name, GFP_KERNEL);
|
if (!data->action_name) {
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
data->handler = handler;
|
out:
|
return ret;
|
}
|
|
static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
|
char *str, enum handler_id handler)
|
{
|
struct action_data *data;
|
int ret = -EINVAL;
|
char *var_str;
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
if (!data)
|
return ERR_PTR(-ENOMEM);
|
|
var_str = strsep(&str, ")");
|
if (!var_str || !str) {
|
ret = -EINVAL;
|
goto free;
|
}
|
|
data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
|
if (!data->track_data.var_str) {
|
ret = -ENOMEM;
|
goto free;
|
}
|
|
ret = action_parse(hist_data->event_file->tr, str, data, handler);
|
if (ret)
|
goto free;
|
out:
|
return data;
|
free:
|
track_data_destroy(hist_data, data);
|
data = ERR_PTR(ret);
|
goto out;
|
}
|
|
static void onmatch_destroy(struct action_data *data)
|
{
|
kfree(data->match_data.event);
|
kfree(data->match_data.event_system);
|
|
action_data_destroy(data);
|
}
|
|
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]);
|
|
for (i = 0; i < hist_data->n_save_vars; i++)
|
destroy_field_var(hist_data->save_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 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];
|
|
/*
|
* A dynamic string synth field can accept static or
|
* dynamic. A static string synth field can only accept a
|
* same-sized static string, which is checked for later.
|
*/
|
if (strstr(hist_field->type, "char[") && field->is_string
|
&& field->is_dynamic)
|
return 0;
|
|
if (strcmp(field->type, hist_field->type) != 0) {
|
if (field->size != hist_field->size ||
|
(!field->is_string && field->is_signed != hist_field->is_signed))
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static struct hist_field *
|
trace_action_find_var(struct hist_trigger_data *hist_data,
|
struct action_data *data,
|
char *system, char *event, char *var)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
struct hist_field *hist_field;
|
|
var++; /* skip '$' */
|
|
hist_field = find_target_event_var(hist_data, system, event, var);
|
if (!hist_field) {
|
if (!system && data->handler == HANDLER_ONMATCH) {
|
system = data->match_data.event_system;
|
event = data->match_data.event;
|
}
|
|
hist_field = find_event_var(hist_data, system, event, var);
|
}
|
|
if (!hist_field)
|
hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
|
|
return hist_field;
|
}
|
|
static struct hist_field *
|
trace_action_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 && data->handler == HANDLER_ONMATCH) {
|
system = data->match_data.event_system;
|
event = data->match_data.event;
|
}
|
|
if (!event)
|
goto free;
|
/*
|
* 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 trace_action_create(struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
char *event_name, *param, *system = NULL;
|
struct hist_field *hist_field, *var_ref;
|
unsigned int i;
|
unsigned int field_pos = 0;
|
struct synth_event *event;
|
char *synth_event_name;
|
int var_ref_idx, ret = 0;
|
|
lockdep_assert_held(&event_mutex);
|
|
if (data->use_trace_keyword)
|
synth_event_name = data->synth_event_name;
|
else
|
synth_event_name = data->action_name;
|
|
event = find_synth_event(synth_event_name);
|
if (!event) {
|
hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
|
return -EINVAL;
|
}
|
|
event->ref++;
|
|
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 = trace_action_find_var(hist_data, data,
|
system, event_name,
|
param);
|
else
|
hist_field = trace_action_create_field_var(hist_data,
|
data,
|
system,
|
event_name,
|
param);
|
|
if (!hist_field) {
|
kfree(p);
|
ret = -EINVAL;
|
goto err;
|
}
|
|
if (check_synth_field(event, hist_field, field_pos) == 0) {
|
var_ref = create_var_ref(hist_data, hist_field,
|
system, event_name);
|
if (!var_ref) {
|
kfree(p);
|
ret = -ENOMEM;
|
goto err;
|
}
|
|
var_ref_idx = find_var_ref_idx(hist_data, var_ref);
|
if (WARN_ON(var_ref_idx < 0)) {
|
kfree(p);
|
ret = var_ref_idx;
|
goto err;
|
}
|
|
data->var_ref_idx[i] = var_ref_idx;
|
|
field_pos++;
|
kfree(p);
|
continue;
|
}
|
|
hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
|
kfree(p);
|
ret = -EINVAL;
|
goto err;
|
}
|
|
if (field_pos != event->n_fields) {
|
hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
|
ret = -EINVAL;
|
goto err;
|
}
|
|
data->synth_event = event;
|
out:
|
return ret;
|
err:
|
event->ref--;
|
|
goto out;
|
}
|
|
static int action_create(struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
struct trace_event_file *file = hist_data->event_file;
|
struct trace_array *tr = file->tr;
|
struct track_data *track_data;
|
struct field_var *field_var;
|
unsigned int i;
|
char *param;
|
int ret = 0;
|
|
if (data->action == ACTION_TRACE)
|
return trace_action_create(hist_data, data);
|
|
if (data->action == ACTION_SNAPSHOT) {
|
track_data = track_data_alloc(hist_data->key_size, data, hist_data);
|
if (IS_ERR(track_data)) {
|
ret = PTR_ERR(track_data);
|
goto out;
|
}
|
|
ret = tracing_snapshot_cond_enable(file->tr, track_data,
|
cond_snapshot_update);
|
if (ret)
|
track_data_free(track_data);
|
|
goto out;
|
}
|
|
if (data->action == ACTION_SAVE) {
|
if (hist_data->n_save_vars) {
|
ret = -EEXIST;
|
hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
|
goto out;
|
}
|
|
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(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
|
errpos(param));
|
ret = PTR_ERR(field_var);
|
kfree(param);
|
goto out;
|
}
|
|
hist_data->save_vars[hist_data->n_save_vars++] = field_var;
|
if (field_var->val->flags & HIST_FIELD_FL_STRING)
|
hist_data->n_save_var_str++;
|
kfree(param);
|
}
|
}
|
out:
|
return ret;
|
}
|
|
static int onmatch_create(struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
return action_create(hist_data, data);
|
}
|
|
static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
|
{
|
char *match_event, *match_event_system;
|
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(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
|
goto free;
|
}
|
|
match_event_system = strsep(&match_event, ".");
|
if (!match_event) {
|
hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
|
goto free;
|
}
|
|
if (IS_ERR(event_file(tr, match_event_system, match_event))) {
|
hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
|
goto free;
|
}
|
|
data->match_data.event = kstrdup(match_event, GFP_KERNEL);
|
if (!data->match_data.event) {
|
ret = -ENOMEM;
|
goto free;
|
}
|
|
data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
|
if (!data->match_data.event_system) {
|
ret = -ENOMEM;
|
goto free;
|
}
|
|
ret = action_parse(tr, str, data, HANDLER_ONMATCH);
|
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)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
unsigned long flags = 0;
|
int ret;
|
|
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(tr, HIST_ERR_DUPLICATE_VAR, errpos(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;
|
|
ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
|
|
if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
|
hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
|
|
return ret;
|
}
|
|
static int create_val_fields(struct hist_trigger_data *hist_data,
|
struct trace_event_file *file)
|
{
|
char *fields_str, *field_str;
|
unsigned int i, j = 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;
|
|
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 trace_array *tr = hist_data->event_file->tr;
|
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 (field_has_hist_vars(hist_field, 0)) {
|
hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(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;
|
|
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)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
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(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
|
errpos(var_name));
|
ret = -EINVAL;
|
goto free;
|
}
|
|
if (n_vars == TRACING_MAP_VARS_MAX) {
|
hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(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]);
|
hist_data->attrs->var_defs.name[n_vars] = NULL;
|
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(struct trace_array *tr, const char *str)
|
{
|
if (!str)
|
return 0;
|
|
if (strcmp(str, "descending") == 0)
|
return 1;
|
|
if (strcmp(str, "ascending") == 0)
|
return 0;
|
|
hist_err(tr, HIST_ERR_INVALID_SORT_MODIFIER, errpos((char *)str));
|
|
return -EINVAL;
|
}
|
|
static int create_sort_keys(struct hist_trigger_data *hist_data)
|
{
|
struct trace_array *tr = hist_data->event_file->tr;
|
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;
|
|
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)
|
break;
|
|
if (!*field_str) {
|
ret = -EINVAL;
|
hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
|
break;
|
}
|
|
if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
|
hist_err(tr, HIST_ERR_TOO_MANY_SORT_FIELDS, errpos("sort="));
|
ret = -EINVAL;
|
break;
|
}
|
|
field_name = strsep(&field_str, ".");
|
if (!field_name || !*field_name) {
|
ret = -EINVAL;
|
hist_err(tr, HIST_ERR_EMPTY_SORT_FIELD, errpos("sort="));
|
break;
|
}
|
|
if (strcmp(field_name, "hitcount") == 0) {
|
descending = is_descending(tr, 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(tr, field_str);
|
if (descending < 0) {
|
ret = descending;
|
goto out;
|
}
|
sort_key->descending = descending;
|
break;
|
}
|
}
|
if (j == hist_data->n_fields) {
|
ret = -EINVAL;
|
hist_err(tr, HIST_ERR_INVALID_SORT_FIELD, errpos(field_name));
|
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->handler == HANDLER_ONMATCH)
|
onmatch_destroy(data);
|
else if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE)
|
track_data_destroy(hist_data, 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;
|
int len;
|
|
for (i = 0; i < hist_data->attrs->n_actions; i++) {
|
str = hist_data->attrs->action_str[i];
|
|
if ((len = str_has_prefix(str, "onmatch("))) {
|
char *action_str = str + len;
|
|
data = onmatch_parse(tr, action_str);
|
if (IS_ERR(data)) {
|
ret = PTR_ERR(data);
|
break;
|
}
|
} else if ((len = str_has_prefix(str, "onmax("))) {
|
char *action_str = str + len;
|
|
data = track_data_parse(hist_data, action_str,
|
HANDLER_ONMAX);
|
if (IS_ERR(data)) {
|
ret = PTR_ERR(data);
|
break;
|
}
|
} else if ((len = str_has_prefix(str, "onchange("))) {
|
char *action_str = str + len;
|
|
data = track_data_parse(hist_data, action_str,
|
HANDLER_ONCHANGE);
|
if (IS_ERR(data)) {
|
ret = PTR_ERR(data);
|
break;
|
}
|
} 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 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->handler == HANDLER_ONMATCH) {
|
ret = onmatch_create(hist_data, data);
|
if (ret)
|
break;
|
} else if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE) {
|
ret = track_data_create(hist_data, data);
|
if (ret)
|
break;
|
} else {
|
ret = -EINVAL;
|
break;
|
}
|
}
|
|
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->action == ACTION_SNAPSHOT)
|
continue;
|
|
if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE)
|
track_data_print(m, hist_data, elt, data);
|
}
|
}
|
|
static void print_action_spec(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
unsigned int i;
|
|
if (data->action == ACTION_SAVE) {
|
for (i = 0; i < hist_data->n_save_vars; i++) {
|
seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
|
if (i < hist_data->n_save_vars - 1)
|
seq_puts(m, ",");
|
}
|
} else if (data->action == ACTION_TRACE) {
|
if (data->use_trace_keyword)
|
seq_printf(m, "%s", data->synth_event_name);
|
for (i = 0; i < data->n_params; i++) {
|
if (i || data->use_trace_keyword)
|
seq_puts(m, ",");
|
seq_printf(m, "%s", data->params[i]);
|
}
|
}
|
}
|
|
static void print_track_data_spec(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
if (data->handler == HANDLER_ONMAX)
|
seq_puts(m, ":onmax(");
|
else if (data->handler == HANDLER_ONCHANGE)
|
seq_puts(m, ":onchange(");
|
seq_printf(m, "%s", data->track_data.var_str);
|
seq_printf(m, ").%s(", data->action_name);
|
|
print_action_spec(m, hist_data, data);
|
|
seq_puts(m, ")");
|
}
|
|
static void print_onmatch_spec(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
struct action_data *data)
|
{
|
seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
|
data->match_data.event);
|
|
seq_printf(m, "%s(", data->action_name);
|
|
print_action_spec(m, hist_data, data);
|
|
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];
|
char *action_name, *action_name_test;
|
|
if (data->handler != data_test->handler)
|
return false;
|
if (data->action != data_test->action)
|
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->use_trace_keyword)
|
action_name = data->synth_event_name;
|
else
|
action_name = data->action_name;
|
|
if (data_test->use_trace_keyword)
|
action_name_test = data_test->synth_event_name;
|
else
|
action_name_test = data_test->action_name;
|
|
if (strcmp(action_name, action_name_test) != 0)
|
return false;
|
|
if (data->handler == HANDLER_ONMATCH) {
|
if (strcmp(data->match_data.event_system,
|
data_test->match_data.event_system) != 0)
|
return false;
|
if (strcmp(data->match_data.event,
|
data_test->match_data.event) != 0)
|
return false;
|
} else if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE) {
|
if (strcmp(data->track_data.var_str,
|
data_test->track_data.var_str) != 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->handler == HANDLER_ONMATCH)
|
print_onmatch_spec(m, hist_data, data);
|
else if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE)
|
print_track_data_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);
|
|
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 || hist_field->flags & HIST_FIELD_FL_CPU)
|
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;
|
|
if (hist_field->flags & HIST_FIELD_FL_STRING) {
|
unsigned int str_start, var_str_idx, idx;
|
char *str, *val_str;
|
unsigned int size;
|
|
str_start = hist_data->n_field_var_str +
|
hist_data->n_save_var_str;
|
var_str_idx = hist_field->var_str_idx;
|
idx = str_start + var_str_idx;
|
|
str = elt_data->field_var_str[idx];
|
val_str = (char *)(uintptr_t)hist_val;
|
|
size = min(hist_field->size, STR_VAR_LEN_MAX);
|
strscpy(str, val_str, size);
|
|
hist_val = (u64)(uintptr_t)str;
|
}
|
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_STATIC_STRING)
|
size = field->size;
|
|
/* ensure NULL-termination */
|
if (size > key_field->size - 1)
|
size = key_field->size - 1;
|
|
strncpy(compound_key + key_field->offset, (char *)key, size);
|
} else
|
memcpy(compound_key + key_field->offset, key, size);
|
}
|
|
static void
|
hist_trigger_actions(struct hist_trigger_data *hist_data,
|
struct tracing_map_elt *elt, void *rec,
|
struct ring_buffer_event *rbe, void *key,
|
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, key, 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 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) {
|
memset(entries, 0, HIST_STACKTRACE_SIZE);
|
stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
|
HIST_STACKTRACE_SKIP);
|
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, key, 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])
|
return;
|
|
seq_printf(m, "%*c", 1 + spaces, ' ');
|
sprint_symbol(str, stacktrace_entries[i]);
|
seq_printf(m, "%s\n", str);
|
}
|
}
|
|
static void hist_trigger_print_key(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, "}");
|
}
|
|
static void hist_trigger_entry_print(struct seq_file *m,
|
struct hist_trigger_data *hist_data,
|
void *key,
|
struct tracing_map_elt *elt)
|
{
|
const char *field_name;
|
unsigned int i;
|
|
hist_trigger_print_key(m, hist_data, key, elt);
|
|
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;
|
|
track_data_snapshot_print(m, hist_data);
|
|
seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
|
(u64)atomic64_read(&hist_data->map->hits),
|
n_entries, (u64)atomic64_read(&hist_data->map->drops));
|
}
|
|
static int hist_show(struct seq_file *m, void *v)
|
{
|
struct event_trigger_data *data;
|
struct trace_event_file *event_file;
|
int n = 0, ret = 0;
|
|
mutex_lock(&event_mutex);
|
|
event_file = event_file_data(m->private);
|
if (unlikely(!event_file)) {
|
ret = -ENODEV;
|
goto out_unlock;
|
}
|
|
list_for_each_entry(data, &event_file->triggers, list) {
|
if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
|
hist_trigger_show(m, data, n++);
|
}
|
|
out_unlock:
|
mutex_unlock(&event_mutex);
|
|
return ret;
|
}
|
|
static int event_hist_open(struct inode *inode, struct file *file)
|
{
|
int ret;
|
|
ret = security_locked_down(LOCKDOWN_TRACEFS);
|
if (ret)
|
return ret;
|
|
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,
|
};
|
|
#ifdef CONFIG_HIST_TRIGGERS_DEBUG
|
static void hist_field_debug_show_flags(struct seq_file *m,
|
unsigned long flags)
|
{
|
seq_puts(m, " flags:\n");
|
|
if (flags & HIST_FIELD_FL_KEY)
|
seq_puts(m, " HIST_FIELD_FL_KEY\n");
|
else if (flags & HIST_FIELD_FL_HITCOUNT)
|
seq_puts(m, " VAL: HIST_FIELD_FL_HITCOUNT\n");
|
else if (flags & HIST_FIELD_FL_VAR)
|
seq_puts(m, " HIST_FIELD_FL_VAR\n");
|
else if (flags & HIST_FIELD_FL_VAR_REF)
|
seq_puts(m, " HIST_FIELD_FL_VAR_REF\n");
|
else
|
seq_puts(m, " VAL: normal u64 value\n");
|
|
if (flags & HIST_FIELD_FL_ALIAS)
|
seq_puts(m, " HIST_FIELD_FL_ALIAS\n");
|
}
|
|
static int hist_field_debug_show(struct seq_file *m,
|
struct hist_field *field, unsigned long flags)
|
{
|
if ((field->flags & flags) != flags) {
|
seq_printf(m, "ERROR: bad flags - %lx\n", flags);
|
return -EINVAL;
|
}
|
|
hist_field_debug_show_flags(m, field->flags);
|
if (field->field)
|
seq_printf(m, " ftrace_event_field name: %s\n",
|
field->field->name);
|
|
if (field->flags & HIST_FIELD_FL_VAR) {
|
seq_printf(m, " var.name: %s\n", field->var.name);
|
seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
|
field->var.idx);
|
}
|
|
if (field->flags & HIST_FIELD_FL_ALIAS)
|
seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
|
field->var_ref_idx);
|
|
if (field->flags & HIST_FIELD_FL_VAR_REF) {
|
seq_printf(m, " name: %s\n", field->name);
|
seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
|
field->var.idx);
|
seq_printf(m, " var.hist_data: %p\n", field->var.hist_data);
|
seq_printf(m, " var_ref_idx (into hist_data->var_refs[]): %u\n",
|
field->var_ref_idx);
|
if (field->system)
|
seq_printf(m, " system: %s\n", field->system);
|
if (field->event_name)
|
seq_printf(m, " event_name: %s\n", field->event_name);
|
}
|
|
seq_printf(m, " type: %s\n", field->type);
|
seq_printf(m, " size: %u\n", field->size);
|
seq_printf(m, " is_signed: %u\n", field->is_signed);
|
|
return 0;
|
}
|
|
static int field_var_debug_show(struct seq_file *m,
|
struct field_var *field_var, unsigned int i,
|
bool save_vars)
|
{
|
const char *vars_name = save_vars ? "save_vars" : "field_vars";
|
struct hist_field *field;
|
int ret = 0;
|
|
seq_printf(m, "\n hist_data->%s[%d]:\n", vars_name, i);
|
|
field = field_var->var;
|
|
seq_printf(m, "\n %s[%d].var:\n", vars_name, i);
|
|
hist_field_debug_show_flags(m, field->flags);
|
seq_printf(m, " var.name: %s\n", field->var.name);
|
seq_printf(m, " var.idx (into tracing_map_elt.vars[]): %u\n",
|
field->var.idx);
|
|
field = field_var->val;
|
|
seq_printf(m, "\n %s[%d].val:\n", vars_name, i);
|
if (field->field)
|
seq_printf(m, " ftrace_event_field name: %s\n",
|
field->field->name);
|
else {
|
ret = -EINVAL;
|
goto out;
|
}
|
|
seq_printf(m, " type: %s\n", field->type);
|
seq_printf(m, " size: %u\n", field->size);
|
seq_printf(m, " is_signed: %u\n", field->is_signed);
|
out:
|
return ret;
|
}
|
|
static int hist_action_debug_show(struct seq_file *m,
|
struct action_data *data, int i)
|
{
|
int ret = 0;
|
|
if (data->handler == HANDLER_ONMAX ||
|
data->handler == HANDLER_ONCHANGE) {
|
seq_printf(m, "\n hist_data->actions[%d].track_data.var_ref:\n", i);
|
ret = hist_field_debug_show(m, data->track_data.var_ref,
|
HIST_FIELD_FL_VAR_REF);
|
if (ret)
|
goto out;
|
|
seq_printf(m, "\n hist_data->actions[%d].track_data.track_var:\n", i);
|
ret = hist_field_debug_show(m, data->track_data.track_var,
|
HIST_FIELD_FL_VAR);
|
if (ret)
|
goto out;
|
}
|
|
if (data->handler == HANDLER_ONMATCH) {
|
seq_printf(m, "\n hist_data->actions[%d].match_data.event_system: %s\n",
|
i, data->match_data.event_system);
|
seq_printf(m, " hist_data->actions[%d].match_data.event: %s\n",
|
i, data->match_data.event);
|
}
|
out:
|
return ret;
|
}
|
|
static int hist_actions_debug_show(struct seq_file *m,
|
struct hist_trigger_data *hist_data)
|
{
|
int i, ret = 0;
|
|
if (hist_data->n_actions)
|
seq_puts(m, "\n action tracking variables (for onmax()/onchange()/onmatch()):\n");
|
|
for (i = 0; i < hist_data->n_actions; i++) {
|
struct action_data *action = hist_data->actions[i];
|
|
ret = hist_action_debug_show(m, action, i);
|
if (ret)
|
goto out;
|
}
|
|
if (hist_data->n_save_vars)
|
seq_puts(m, "\n save action variables (save() params):\n");
|
|
for (i = 0; i < hist_data->n_save_vars; i++) {
|
ret = field_var_debug_show(m, hist_data->save_vars[i], i, true);
|
if (ret)
|
goto out;
|
}
|
out:
|
return ret;
|
}
|
|
static void hist_trigger_debug_show(struct seq_file *m,
|
struct event_trigger_data *data, int n)
|
{
|
struct hist_trigger_data *hist_data;
|
int i, ret;
|
|
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;
|
|
seq_printf(m, "hist_data: %p\n\n", hist_data);
|
seq_printf(m, " n_vals: %u\n", hist_data->n_vals);
|
seq_printf(m, " n_keys: %u\n", hist_data->n_keys);
|
seq_printf(m, " n_fields: %u\n", hist_data->n_fields);
|
|
seq_puts(m, "\n val fields:\n\n");
|
|
seq_puts(m, " hist_data->fields[0]:\n");
|
ret = hist_field_debug_show(m, hist_data->fields[0],
|
HIST_FIELD_FL_HITCOUNT);
|
if (ret)
|
return;
|
|
for (i = 1; i < hist_data->n_vals; i++) {
|
seq_printf(m, "\n hist_data->fields[%d]:\n", i);
|
ret = hist_field_debug_show(m, hist_data->fields[i], 0);
|
if (ret)
|
return;
|
}
|
|
seq_puts(m, "\n key fields:\n");
|
|
for (i = hist_data->n_vals; i < hist_data->n_fields; i++) {
|
seq_printf(m, "\n hist_data->fields[%d]:\n", i);
|
ret = hist_field_debug_show(m, hist_data->fields[i],
|
HIST_FIELD_FL_KEY);
|
if (ret)
|
return;
|
}
|
|
if (hist_data->n_var_refs)
|
seq_puts(m, "\n variable reference fields:\n");
|
|
for (i = 0; i < hist_data->n_var_refs; i++) {
|
seq_printf(m, "\n hist_data->var_refs[%d]:\n", i);
|
ret = hist_field_debug_show(m, hist_data->var_refs[i],
|
HIST_FIELD_FL_VAR_REF);
|
if (ret)
|
return;
|
}
|
|
if (hist_data->n_field_vars)
|
seq_puts(m, "\n field variables:\n");
|
|
for (i = 0; i < hist_data->n_field_vars; i++) {
|
ret = field_var_debug_show(m, hist_data->field_vars[i], i, false);
|
if (ret)
|
return;
|
}
|
|
ret = hist_actions_debug_show(m, hist_data);
|
if (ret)
|
return;
|
}
|
|
static int hist_debug_show(struct seq_file *m, void *v)
|
{
|
struct event_trigger_data *data;
|
struct trace_event_file *event_file;
|
int n = 0, ret = 0;
|
|
mutex_lock(&event_mutex);
|
|
event_file = event_file_data(m->private);
|
if (unlikely(!event_file)) {
|
ret = -ENODEV;
|
goto out_unlock;
|
}
|
|
list_for_each_entry(data, &event_file->triggers, list) {
|
if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
|
hist_trigger_debug_show(m, data, n++);
|
}
|
|
out_unlock:
|
mutex_unlock(&event_mutex);
|
|
return ret;
|
}
|
|
static int event_hist_debug_open(struct inode *inode, struct file *file)
|
{
|
int ret;
|
|
ret = security_locked_down(LOCKDOWN_TRACEFS);
|
if (ret)
|
return ret;
|
|
return single_open(file, hist_debug_show, file);
|
}
|
|
const struct file_operations event_hist_debug_fops = {
|
.open = event_hist_debug_open,
|
.read = seq_read,
|
.llseek = seq_lseek,
|
.release = single_release,
|
};
|
#endif
|
|
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, "common_cpu");
|
else if (field_name) {
|
if (hist_field->flags & HIST_FIELD_FL_VAR_REF ||
|
hist_field->flags & HIST_FIELD_FL_ALIAS)
|
seq_putc(m, '$');
|
seq_printf(m, "%s", field_name);
|
} else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
|
seq_puts(m, "common_timestamp");
|
|
if (hist_field->flags) {
|
if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
|
!(hist_field->flags & HIST_FIELD_FL_EXPR)) {
|
const char *flags = get_hist_field_flags(hist_field);
|
|
if (flags)
|
seq_printf(m, ".%s", flags);
|
}
|
}
|
}
|
|
static int event_hist_trigger_print(struct seq_file *m,
|
struct event_trigger_ops *ops,
|
struct event_trigger_data *data)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
struct hist_field *field;
|
bool have_var = false;
|
unsigned int i;
|
|
seq_puts(m, "hist:");
|
|
if (data->name)
|
seq_printf(m, "%s:", data->name);
|
|
seq_puts(m, "keys=");
|
|
for_each_hist_key_field(i, hist_data) {
|
field = hist_data->fields[i];
|
|
if (i > hist_data->n_vals)
|
seq_puts(m, ",");
|
|
if (field->flags & HIST_FIELD_FL_STACKTRACE)
|
seq_puts(m, "stacktrace");
|
else
|
hist_field_print(m, field);
|
}
|
|
seq_puts(m, ":vals=");
|
|
for_each_hist_val_field(i, hist_data) {
|
field = hist_data->fields[i];
|
if (field->flags & HIST_FIELD_FL_VAR) {
|
have_var = true;
|
continue;
|
}
|
|
if (i == HITCOUNT_IDX)
|
seq_puts(m, "hitcount");
|
else {
|
seq_puts(m, ",");
|
hist_field_print(m, field);
|
}
|
}
|
|
if (have_var) {
|
unsigned int n = 0;
|
|
seq_puts(m, ":");
|
|
for_each_hist_val_field(i, hist_data) {
|
field = hist_data->fields[i];
|
|
if (field->flags & HIST_FIELD_FL_VAR) {
|
if (n++)
|
seq_puts(m, ",");
|
hist_field_print(m, field);
|
}
|
}
|
}
|
|
seq_puts(m, ":sort=");
|
|
for (i = 0; i < hist_data->n_sort_keys; i++) {
|
struct tracing_map_sort_key *sort_key;
|
unsigned int idx, first_key_idx;
|
|
/* skip VAR vals */
|
first_key_idx = hist_data->n_vals - hist_data->n_vars;
|
|
sort_key = &hist_data->sort_keys[i];
|
idx = sort_key->field_idx;
|
|
if (WARN_ON(idx >= HIST_FIELDS_MAX))
|
return -EINVAL;
|
|
if (i > 0)
|
seq_puts(m, ",");
|
|
if (idx == HITCOUNT_IDX)
|
seq_puts(m, "hitcount");
|
else {
|
if (idx >= first_key_idx)
|
idx += hist_data->n_vars;
|
hist_field_print(m, hist_data->fields[idx]);
|
}
|
|
if (sort_key->descending)
|
seq_puts(m, ".descending");
|
}
|
seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
|
if (hist_data->enable_timestamps)
|
seq_printf(m, ":clock=%s", hist_data->attrs->clock);
|
|
print_actions_spec(m, hist_data);
|
|
if (data->filter_str)
|
seq_printf(m, " if %s", data->filter_str);
|
|
if (data->paused)
|
seq_puts(m, " [paused]");
|
else
|
seq_puts(m, " [active]");
|
|
seq_putc(m, '\n');
|
|
return 0;
|
}
|
|
static int event_hist_trigger_init(struct event_trigger_ops *ops,
|
struct event_trigger_data *data)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
if (!data->ref && hist_data->attrs->name)
|
save_named_trigger(hist_data->attrs->name, data);
|
|
data->ref++;
|
|
return 0;
|
}
|
|
static void unregister_field_var_hists(struct hist_trigger_data *hist_data)
|
{
|
struct trace_event_file *file;
|
unsigned int i;
|
char *cmd;
|
int ret;
|
|
for (i = 0; i < hist_data->n_field_var_hists; i++) {
|
file = hist_data->field_var_hists[i]->hist_data->event_file;
|
cmd = hist_data->field_var_hists[i]->cmd;
|
ret = event_hist_trigger_func(&trigger_hist_cmd, file,
|
"!hist", "hist", cmd);
|
}
|
}
|
|
static void event_hist_trigger_free(struct event_trigger_ops *ops,
|
struct event_trigger_data *data)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
if (WARN_ON_ONCE(data->ref <= 0))
|
return;
|
|
data->ref--;
|
if (!data->ref) {
|
if (data->name)
|
del_named_trigger(data);
|
|
trigger_data_free(data);
|
|
remove_hist_vars(hist_data);
|
|
unregister_field_var_hists(hist_data);
|
|
destroy_hist_data(hist_data);
|
}
|
}
|
|
static struct event_trigger_ops event_hist_trigger_ops = {
|
.func = event_hist_trigger,
|
.print = event_hist_trigger_print,
|
.init = event_hist_trigger_init,
|
.free = event_hist_trigger_free,
|
};
|
|
static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
|
struct event_trigger_data *data)
|
{
|
data->ref++;
|
|
save_named_trigger(data->named_data->name, data);
|
|
event_hist_trigger_init(ops, data->named_data);
|
|
return 0;
|
}
|
|
static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
|
struct event_trigger_data *data)
|
{
|
if (WARN_ON_ONCE(data->ref <= 0))
|
return;
|
|
event_hist_trigger_free(ops, data->named_data);
|
|
data->ref--;
|
if (!data->ref) {
|
del_named_trigger(data);
|
trigger_data_free(data);
|
}
|
}
|
|
static struct event_trigger_ops event_hist_trigger_named_ops = {
|
.func = event_hist_trigger,
|
.print = event_hist_trigger_print,
|
.init = event_hist_trigger_named_init,
|
.free = event_hist_trigger_named_free,
|
};
|
|
static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
|
char *param)
|
{
|
return &event_hist_trigger_ops;
|
}
|
|
static void hist_clear(struct event_trigger_data *data)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
|
if (data->name)
|
pause_named_trigger(data);
|
|
tracepoint_synchronize_unregister();
|
|
tracing_map_clear(hist_data->map);
|
|
if (data->name)
|
unpause_named_trigger(data);
|
}
|
|
static bool compatible_field(struct ftrace_event_field *field,
|
struct ftrace_event_field *test_field)
|
{
|
if (field == test_field)
|
return true;
|
if (field == NULL || test_field == NULL)
|
return false;
|
if (strcmp(field->name, test_field->name) != 0)
|
return false;
|
if (strcmp(field->type, test_field->type) != 0)
|
return false;
|
if (field->size != test_field->size)
|
return false;
|
if (field->is_signed != test_field->is_signed)
|
return false;
|
|
return true;
|
}
|
|
static bool hist_trigger_match(struct event_trigger_data *data,
|
struct event_trigger_data *data_test,
|
struct event_trigger_data *named_data,
|
bool ignore_filter)
|
{
|
struct tracing_map_sort_key *sort_key, *sort_key_test;
|
struct hist_trigger_data *hist_data, *hist_data_test;
|
struct hist_field *key_field, *key_field_test;
|
unsigned int i;
|
|
if (named_data && (named_data != data_test) &&
|
(named_data != data_test->named_data))
|
return false;
|
|
if (!named_data && is_named_trigger(data_test))
|
return false;
|
|
hist_data = data->private_data;
|
hist_data_test = data_test->private_data;
|
|
if (hist_data->n_vals != hist_data_test->n_vals ||
|
hist_data->n_fields != hist_data_test->n_fields ||
|
hist_data->n_sort_keys != hist_data_test->n_sort_keys)
|
return false;
|
|
if (!ignore_filter) {
|
if ((data->filter_str && !data_test->filter_str) ||
|
(!data->filter_str && data_test->filter_str))
|
return false;
|
}
|
|
for_each_hist_field(i, hist_data) {
|
key_field = hist_data->fields[i];
|
key_field_test = hist_data_test->fields[i];
|
|
if (key_field->flags != key_field_test->flags)
|
return false;
|
if (!compatible_field(key_field->field, key_field_test->field))
|
return false;
|
if (key_field->offset != key_field_test->offset)
|
return false;
|
if (key_field->size != key_field_test->size)
|
return false;
|
if (key_field->is_signed != key_field_test->is_signed)
|
return false;
|
if (!!key_field->var.name != !!key_field_test->var.name)
|
return false;
|
if (key_field->var.name &&
|
strcmp(key_field->var.name, key_field_test->var.name) != 0)
|
return false;
|
}
|
|
for (i = 0; i < hist_data->n_sort_keys; i++) {
|
sort_key = &hist_data->sort_keys[i];
|
sort_key_test = &hist_data_test->sort_keys[i];
|
|
if (sort_key->field_idx != sort_key_test->field_idx ||
|
sort_key->descending != sort_key_test->descending)
|
return false;
|
}
|
|
if (!ignore_filter && data->filter_str &&
|
(strcmp(data->filter_str, data_test->filter_str) != 0))
|
return false;
|
|
if (!actions_match(hist_data, hist_data_test))
|
return false;
|
|
return true;
|
}
|
|
static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
|
struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
struct event_trigger_data *test, *named_data = NULL;
|
struct trace_array *tr = file->tr;
|
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(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
|
ret = -EINVAL;
|
goto out;
|
}
|
}
|
}
|
|
if (hist_data->attrs->name && !named_data)
|
goto new;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
if (!hist_trigger_match(data, test, named_data, false))
|
continue;
|
if (hist_data->attrs->pause)
|
test->paused = true;
|
else if (hist_data->attrs->cont)
|
test->paused = false;
|
else if (hist_data->attrs->clear)
|
hist_clear(test);
|
else {
|
hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
|
ret = -EEXIST;
|
}
|
goto out;
|
}
|
}
|
new:
|
if (hist_data->attrs->cont || hist_data->attrs->clear) {
|
hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
|
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(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
|
goto out;
|
}
|
|
tracing_set_time_stamp_abs(file->tr, true);
|
}
|
|
if (named_data)
|
destroy_hist_data(hist_data);
|
|
ret++;
|
out:
|
return ret;
|
}
|
|
static int hist_trigger_enable(struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
int ret = 0;
|
|
list_add_tail_rcu(&data->list, &file->triggers);
|
|
update_cond_flag(file);
|
|
if (trace_event_trigger_enable_disable(file, 1) < 0) {
|
list_del_rcu(&data->list);
|
update_cond_flag(file);
|
ret--;
|
}
|
|
return ret;
|
}
|
|
static bool have_hist_trigger_match(struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
struct event_trigger_data *test, *named_data = NULL;
|
bool match = false;
|
|
lockdep_assert_held(&event_mutex);
|
|
if (hist_data->attrs->name)
|
named_data = find_named_trigger(hist_data->attrs->name);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
if (hist_trigger_match(data, test, named_data, false)) {
|
match = true;
|
break;
|
}
|
}
|
}
|
|
return match;
|
}
|
|
static bool hist_trigger_check_refs(struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
struct event_trigger_data *test, *named_data = NULL;
|
|
lockdep_assert_held(&event_mutex);
|
|
if (hist_data->attrs->name)
|
named_data = find_named_trigger(hist_data->attrs->name);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
if (!hist_trigger_match(data, test, named_data, false))
|
continue;
|
hist_data = test->private_data;
|
if (check_var_refs(hist_data))
|
return true;
|
break;
|
}
|
}
|
|
return false;
|
}
|
|
static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
|
struct event_trigger_data *data,
|
struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data = data->private_data;
|
struct event_trigger_data *test, *named_data = NULL;
|
bool unregistered = false;
|
|
lockdep_assert_held(&event_mutex);
|
|
if (hist_data->attrs->name)
|
named_data = find_named_trigger(hist_data->attrs->name);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
if (!hist_trigger_match(data, test, named_data, false))
|
continue;
|
unregistered = true;
|
list_del_rcu(&test->list);
|
trace_event_trigger_enable_disable(file, 0);
|
update_cond_flag(file);
|
break;
|
}
|
}
|
|
if (unregistered && test->ops->free)
|
test->ops->free(test->ops, test);
|
|
if (hist_data->enable_timestamps) {
|
if (!hist_data->remove || unregistered)
|
tracing_set_time_stamp_abs(file->tr, false);
|
}
|
}
|
|
static bool hist_file_check_refs(struct trace_event_file *file)
|
{
|
struct hist_trigger_data *hist_data;
|
struct event_trigger_data *test;
|
|
lockdep_assert_held(&event_mutex);
|
|
list_for_each_entry(test, &file->triggers, list) {
|
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
|
hist_data = test->private_data;
|
if (check_var_refs(hist_data))
|
return true;
|
}
|
}
|
|
return false;
|
}
|
|
static void hist_unreg_all(struct trace_event_file *file)
|
{
|
struct event_trigger_data *test, *n;
|
struct hist_trigger_data *hist_data;
|
struct synth_event *se;
|
const char *se_name;
|
|
lockdep_assert_held(&event_mutex);
|
|
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);
|
|
se_name = trace_event_name(file->event_call);
|
se = find_synth_event(se_name);
|
if (se)
|
se->ref--;
|
|
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;
|
|
lockdep_assert_held(&event_mutex);
|
|
if (glob && strlen(glob)) {
|
hist_err_clear();
|
last_cmd_set(file, param);
|
}
|
|
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) - (sizeof("if") - 1) - 1)
|
return -EINVAL;
|
if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\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(file->tr, 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);
|
se_name = trace_event_name(file->event_call);
|
se = find_synth_event(se_name);
|
if (se)
|
se->ref--;
|
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);
|
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;
|
|
se_name = trace_event_name(file->event_call);
|
se = find_synth_event(se_name);
|
if (se)
|
se->ref++;
|
/* 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,
|
lockdep_is_held(&event_mutex)) {
|
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;
|
}
|
