644 lines
20 KiB
C
644 lines
20 KiB
C
/*
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* auxtrace.h: AUX area trace support
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* Copyright (c) 2013-2015, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef __PERF_AUXTRACE_H
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#define __PERF_AUXTRACE_H
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#include <sys/types.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <linux/list.h>
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#include <linux/perf_event.h>
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#include <linux/types.h>
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#include "../perf.h"
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#include "event.h"
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#include "session.h"
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#include "debug.h"
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union perf_event;
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struct perf_session;
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struct perf_evlist;
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struct perf_tool;
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struct option;
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struct record_opts;
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struct auxtrace_info_event;
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struct events_stats;
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enum auxtrace_type {
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PERF_AUXTRACE_UNKNOWN,
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};
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enum itrace_period_type {
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PERF_ITRACE_PERIOD_INSTRUCTIONS,
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PERF_ITRACE_PERIOD_TICKS,
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PERF_ITRACE_PERIOD_NANOSECS,
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};
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/**
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* struct itrace_synth_opts - AUX area tracing synthesis options.
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* @set: indicates whether or not options have been set
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* @inject: indicates the event (not just the sample) must be fully synthesized
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* because 'perf inject' will write it out
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* @instructions: whether to synthesize 'instructions' events
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* @branches: whether to synthesize 'branches' events
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* @transactions: whether to synthesize events for transactions
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* @errors: whether to synthesize decoder error events
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* @dont_decode: whether to skip decoding entirely
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* @log: write a decoding log
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* @calls: limit branch samples to calls (can be combined with @returns)
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* @returns: limit branch samples to returns (can be combined with @calls)
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* @callchain: add callchain to 'instructions' events
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* @callchain_sz: maximum callchain size
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* @period: 'instructions' events period
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* @period_type: 'instructions' events period type
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*/
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struct itrace_synth_opts {
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bool set;
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bool inject;
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bool instructions;
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bool branches;
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bool transactions;
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bool errors;
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bool dont_decode;
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bool log;
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bool calls;
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bool returns;
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bool callchain;
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unsigned int callchain_sz;
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unsigned long long period;
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enum itrace_period_type period_type;
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};
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/**
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* struct auxtrace_index_entry - indexes a AUX area tracing event within a
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* perf.data file.
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* @file_offset: offset within the perf.data file
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* @sz: size of the event
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*/
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struct auxtrace_index_entry {
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u64 file_offset;
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u64 sz;
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};
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#define PERF_AUXTRACE_INDEX_ENTRY_COUNT 256
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/**
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* struct auxtrace_index - index of AUX area tracing events within a perf.data
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* file.
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* @list: linking a number of arrays of entries
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* @nr: number of entries
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* @entries: array of entries
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*/
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struct auxtrace_index {
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struct list_head list;
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size_t nr;
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struct auxtrace_index_entry entries[PERF_AUXTRACE_INDEX_ENTRY_COUNT];
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};
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/**
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* struct auxtrace - session callbacks to allow AUX area data decoding.
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* @process_event: lets the decoder see all session events
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* @flush_events: process any remaining data
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* @free_events: free resources associated with event processing
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* @free: free resources associated with the session
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*/
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struct auxtrace {
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int (*process_event)(struct perf_session *session,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_tool *tool);
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int (*process_auxtrace_event)(struct perf_session *session,
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union perf_event *event,
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struct perf_tool *tool);
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int (*flush_events)(struct perf_session *session,
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struct perf_tool *tool);
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void (*free_events)(struct perf_session *session);
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void (*free)(struct perf_session *session);
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};
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/**
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* struct auxtrace_buffer - a buffer containing AUX area tracing data.
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* @list: buffers are queued in a list held by struct auxtrace_queue
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* @size: size of the buffer in bytes
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* @pid: in per-thread mode, the pid this buffer is associated with
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* @tid: in per-thread mode, the tid this buffer is associated with
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* @cpu: in per-cpu mode, the cpu this buffer is associated with
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* @data: actual buffer data (can be null if the data has not been loaded)
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* @data_offset: file offset at which the buffer can be read
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* @mmap_addr: mmap address at which the buffer can be read
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* @mmap_size: size of the mmap at @mmap_addr
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* @data_needs_freeing: @data was malloc'd so free it when it is no longer
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* needed
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* @consecutive: the original data was split up and this buffer is consecutive
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* to the previous buffer
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* @offset: offset as determined by aux_head / aux_tail members of struct
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* perf_event_mmap_page
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* @reference: an implementation-specific reference determined when the data is
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* recorded
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* @buffer_nr: used to number each buffer
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* @use_size: implementation actually only uses this number of bytes
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* @use_data: implementation actually only uses data starting at this address
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*/
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struct auxtrace_buffer {
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struct list_head list;
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size_t size;
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pid_t pid;
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pid_t tid;
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int cpu;
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void *data;
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off_t data_offset;
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void *mmap_addr;
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size_t mmap_size;
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bool data_needs_freeing;
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bool consecutive;
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u64 offset;
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u64 reference;
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u64 buffer_nr;
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size_t use_size;
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void *use_data;
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};
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/**
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* struct auxtrace_queue - a queue of AUX area tracing data buffers.
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* @head: head of buffer list
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* @tid: in per-thread mode, the tid this queue is associated with
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* @cpu: in per-cpu mode, the cpu this queue is associated with
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* @set: %true once this queue has been dedicated to a specific thread or cpu
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* @priv: implementation-specific data
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*/
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struct auxtrace_queue {
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struct list_head head;
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pid_t tid;
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int cpu;
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bool set;
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void *priv;
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};
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/**
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* struct auxtrace_queues - an array of AUX area tracing queues.
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* @queue_array: array of queues
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* @nr_queues: number of queues
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* @new_data: set whenever new data is queued
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* @populated: queues have been fully populated using the auxtrace_index
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* @next_buffer_nr: used to number each buffer
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*/
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struct auxtrace_queues {
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struct auxtrace_queue *queue_array;
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unsigned int nr_queues;
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bool new_data;
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bool populated;
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u64 next_buffer_nr;
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};
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/**
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* struct auxtrace_heap_item - element of struct auxtrace_heap.
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* @queue_nr: queue number
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* @ordinal: value used for sorting (lowest ordinal is top of the heap) expected
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* to be a timestamp
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*/
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struct auxtrace_heap_item {
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unsigned int queue_nr;
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u64 ordinal;
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};
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/**
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* struct auxtrace_heap - a heap suitable for sorting AUX area tracing queues.
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* @heap_array: the heap
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* @heap_cnt: the number of elements in the heap
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* @heap_sz: maximum number of elements (grows as needed)
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*/
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struct auxtrace_heap {
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struct auxtrace_heap_item *heap_array;
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unsigned int heap_cnt;
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unsigned int heap_sz;
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};
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/**
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* struct auxtrace_mmap - records an mmap of the auxtrace buffer.
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* @base: address of mapped area
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* @userpg: pointer to buffer's perf_event_mmap_page
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* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
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* @len: size of mapped area
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* @prev: previous aux_head
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* @idx: index of this mmap
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* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
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* mmap) otherwise %0
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* @cpu: cpu number for a per-cpu mmap otherwise %-1
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*/
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struct auxtrace_mmap {
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void *base;
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void *userpg;
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size_t mask;
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size_t len;
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u64 prev;
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int idx;
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pid_t tid;
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int cpu;
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};
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/**
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* struct auxtrace_mmap_params - parameters to set up struct auxtrace_mmap.
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* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
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* @offset: file offset of mapped area
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* @len: size of mapped area
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* @prot: mmap memory protection
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* @idx: index of this mmap
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* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
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* mmap) otherwise %0
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* @cpu: cpu number for a per-cpu mmap otherwise %-1
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*/
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struct auxtrace_mmap_params {
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size_t mask;
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off_t offset;
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size_t len;
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int prot;
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int idx;
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pid_t tid;
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int cpu;
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};
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/**
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* struct auxtrace_record - callbacks for recording AUX area data.
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* @recording_options: validate and process recording options
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* @info_priv_size: return the size of the private data in auxtrace_info_event
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* @info_fill: fill-in the private data in auxtrace_info_event
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* @free: free this auxtrace record structure
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* @snapshot_start: starting a snapshot
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* @snapshot_finish: finishing a snapshot
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* @find_snapshot: find data to snapshot within auxtrace mmap
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* @parse_snapshot_options: parse snapshot options
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* @reference: provide a 64-bit reference number for auxtrace_event
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* @read_finish: called after reading from an auxtrace mmap
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*/
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struct auxtrace_record {
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int (*recording_options)(struct auxtrace_record *itr,
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struct perf_evlist *evlist,
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struct record_opts *opts);
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size_t (*info_priv_size)(struct auxtrace_record *itr);
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int (*info_fill)(struct auxtrace_record *itr,
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struct perf_session *session,
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struct auxtrace_info_event *auxtrace_info,
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size_t priv_size);
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void (*free)(struct auxtrace_record *itr);
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int (*snapshot_start)(struct auxtrace_record *itr);
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int (*snapshot_finish)(struct auxtrace_record *itr);
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int (*find_snapshot)(struct auxtrace_record *itr, int idx,
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struct auxtrace_mmap *mm, unsigned char *data,
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u64 *head, u64 *old);
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int (*parse_snapshot_options)(struct auxtrace_record *itr,
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struct record_opts *opts,
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const char *str);
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u64 (*reference)(struct auxtrace_record *itr);
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int (*read_finish)(struct auxtrace_record *itr, int idx);
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};
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#ifdef HAVE_AUXTRACE_SUPPORT
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/*
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* In snapshot mode the mmapped page is read-only which makes using
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* __sync_val_compare_and_swap() problematic. However, snapshot mode expects
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* the buffer is not updated while the snapshot is made (e.g. Intel PT disables
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* the event) so there is not a race anyway.
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*/
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static inline u64 auxtrace_mmap__read_snapshot_head(struct auxtrace_mmap *mm)
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{
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struct perf_event_mmap_page *pc = mm->userpg;
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u64 head = ACCESS_ONCE(pc->aux_head);
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/* Ensure all reads are done after we read the head */
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rmb();
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return head;
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}
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static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
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{
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struct perf_event_mmap_page *pc = mm->userpg;
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#if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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u64 head = ACCESS_ONCE(pc->aux_head);
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#else
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u64 head = __sync_val_compare_and_swap(&pc->aux_head, 0, 0);
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#endif
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/* Ensure all reads are done after we read the head */
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rmb();
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return head;
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}
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static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
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{
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struct perf_event_mmap_page *pc = mm->userpg;
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#if BITS_PER_LONG != 64 && defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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u64 old_tail;
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#endif
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/* Ensure all reads are done before we write the tail out */
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mb();
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#if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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pc->aux_tail = tail;
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#else
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do {
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old_tail = __sync_val_compare_and_swap(&pc->aux_tail, 0, 0);
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} while (!__sync_bool_compare_and_swap(&pc->aux_tail, old_tail, tail));
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#endif
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}
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int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
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struct auxtrace_mmap_params *mp,
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void *userpg, int fd);
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void auxtrace_mmap__munmap(struct auxtrace_mmap *mm);
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void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
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off_t auxtrace_offset,
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unsigned int auxtrace_pages,
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bool auxtrace_overwrite);
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void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
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struct perf_evlist *evlist, int idx,
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bool per_cpu);
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typedef int (*process_auxtrace_t)(struct perf_tool *tool,
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union perf_event *event, void *data1,
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size_t len1, void *data2, size_t len2);
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int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
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struct perf_tool *tool, process_auxtrace_t fn);
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int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm,
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struct auxtrace_record *itr,
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struct perf_tool *tool, process_auxtrace_t fn,
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size_t snapshot_size);
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int auxtrace_queues__init(struct auxtrace_queues *queues);
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int auxtrace_queues__add_event(struct auxtrace_queues *queues,
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struct perf_session *session,
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union perf_event *event, off_t data_offset,
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struct auxtrace_buffer **buffer_ptr);
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void auxtrace_queues__free(struct auxtrace_queues *queues);
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int auxtrace_queues__process_index(struct auxtrace_queues *queues,
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struct perf_session *session);
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struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
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struct auxtrace_buffer *buffer);
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void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd);
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void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer);
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void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer);
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void auxtrace_buffer__free(struct auxtrace_buffer *buffer);
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int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
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u64 ordinal);
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void auxtrace_heap__pop(struct auxtrace_heap *heap);
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void auxtrace_heap__free(struct auxtrace_heap *heap);
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struct auxtrace_cache_entry {
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struct hlist_node hash;
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u32 key;
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};
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struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
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unsigned int limit_percent);
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void auxtrace_cache__free(struct auxtrace_cache *auxtrace_cache);
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void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c);
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void auxtrace_cache__free_entry(struct auxtrace_cache *c, void *entry);
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int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
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struct auxtrace_cache_entry *entry);
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void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key);
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struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
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int *err);
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int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
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struct record_opts *opts,
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const char *str);
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int auxtrace_record__options(struct auxtrace_record *itr,
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struct perf_evlist *evlist,
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struct record_opts *opts);
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size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr);
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int auxtrace_record__info_fill(struct auxtrace_record *itr,
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struct perf_session *session,
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struct auxtrace_info_event *auxtrace_info,
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size_t priv_size);
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void auxtrace_record__free(struct auxtrace_record *itr);
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int auxtrace_record__snapshot_start(struct auxtrace_record *itr);
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int auxtrace_record__snapshot_finish(struct auxtrace_record *itr);
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int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
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struct auxtrace_mmap *mm,
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unsigned char *data, u64 *head, u64 *old);
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u64 auxtrace_record__reference(struct auxtrace_record *itr);
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int auxtrace_index__auxtrace_event(struct list_head *head, union perf_event *event,
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off_t file_offset);
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int auxtrace_index__write(int fd, struct list_head *head);
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int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
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bool needs_swap);
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void auxtrace_index__free(struct list_head *head);
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void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
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int code, int cpu, pid_t pid, pid_t tid, u64 ip,
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const char *msg);
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int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
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struct perf_tool *tool,
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struct perf_session *session,
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perf_event__handler_t process);
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int perf_event__process_auxtrace_info(struct perf_tool *tool,
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union perf_event *event,
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struct perf_session *session);
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s64 perf_event__process_auxtrace(struct perf_tool *tool,
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union perf_event *event,
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struct perf_session *session);
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int perf_event__process_auxtrace_error(struct perf_tool *tool,
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union perf_event *event,
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struct perf_session *session);
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int itrace_parse_synth_opts(const struct option *opt, const char *str,
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int unset);
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void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts);
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size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp);
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void perf_session__auxtrace_error_inc(struct perf_session *session,
|
|
union perf_event *event);
|
|
void events_stats__auxtrace_error_warn(const struct events_stats *stats);
|
|
|
|
static inline int auxtrace__process_event(struct perf_session *session,
|
|
union perf_event *event,
|
|
struct perf_sample *sample,
|
|
struct perf_tool *tool)
|
|
{
|
|
if (!session->auxtrace)
|
|
return 0;
|
|
|
|
return session->auxtrace->process_event(session, event, sample, tool);
|
|
}
|
|
|
|
static inline int auxtrace__flush_events(struct perf_session *session,
|
|
struct perf_tool *tool)
|
|
{
|
|
if (!session->auxtrace)
|
|
return 0;
|
|
|
|
return session->auxtrace->flush_events(session, tool);
|
|
}
|
|
|
|
static inline void auxtrace__free_events(struct perf_session *session)
|
|
{
|
|
if (!session->auxtrace)
|
|
return;
|
|
|
|
return session->auxtrace->free_events(session);
|
|
}
|
|
|
|
static inline void auxtrace__free(struct perf_session *session)
|
|
{
|
|
if (!session->auxtrace)
|
|
return;
|
|
|
|
return session->auxtrace->free(session);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline struct auxtrace_record *
|
|
auxtrace_record__init(struct perf_evlist *evlist __maybe_unused,
|
|
int *err __maybe_unused)
|
|
{
|
|
*err = 0;
|
|
return NULL;
|
|
}
|
|
|
|
static inline
|
|
void auxtrace_record__free(struct auxtrace_record *itr __maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline int
|
|
perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr __maybe_unused,
|
|
struct perf_tool *tool __maybe_unused,
|
|
struct perf_session *session __maybe_unused,
|
|
perf_event__handler_t process __maybe_unused)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
int auxtrace_record__options(struct auxtrace_record *itr __maybe_unused,
|
|
struct perf_evlist *evlist __maybe_unused,
|
|
struct record_opts *opts __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define perf_event__process_auxtrace_info 0
|
|
#define perf_event__process_auxtrace 0
|
|
#define perf_event__process_auxtrace_error 0
|
|
|
|
static inline
|
|
void perf_session__auxtrace_error_inc(struct perf_session *session
|
|
__maybe_unused,
|
|
union perf_event *event
|
|
__maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
void events_stats__auxtrace_error_warn(const struct events_stats *stats
|
|
__maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
int itrace_parse_synth_opts(const struct option *opt __maybe_unused,
|
|
const char *str __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
pr_err("AUX area tracing not supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
int auxtrace_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
|
|
struct record_opts *opts __maybe_unused,
|
|
const char *str)
|
|
{
|
|
if (!str)
|
|
return 0;
|
|
pr_err("AUX area tracing not supported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
int auxtrace__process_event(struct perf_session *session __maybe_unused,
|
|
union perf_event *event __maybe_unused,
|
|
struct perf_sample *sample __maybe_unused,
|
|
struct perf_tool *tool __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
int auxtrace__flush_events(struct perf_session *session __maybe_unused,
|
|
struct perf_tool *tool __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
void auxtrace__free_events(struct perf_session *session __maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
void auxtrace_cache__free(struct auxtrace_cache *auxtrace_cache __maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
void auxtrace__free(struct perf_session *session __maybe_unused)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
int auxtrace_index__write(int fd __maybe_unused,
|
|
struct list_head *head __maybe_unused)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
int auxtrace_index__process(int fd __maybe_unused,
|
|
u64 size __maybe_unused,
|
|
struct perf_session *session __maybe_unused,
|
|
bool needs_swap __maybe_unused)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
void auxtrace_index__free(struct list_head *head __maybe_unused)
|
|
{
|
|
}
|
|
|
|
int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
|
|
struct auxtrace_mmap_params *mp,
|
|
void *userpg, int fd);
|
|
void auxtrace_mmap__munmap(struct auxtrace_mmap *mm);
|
|
void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
|
|
off_t auxtrace_offset,
|
|
unsigned int auxtrace_pages,
|
|
bool auxtrace_overwrite);
|
|
void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
|
|
struct perf_evlist *evlist, int idx,
|
|
bool per_cpu);
|
|
|
|
#endif
|
|
|
|
#endif
|