path: root/tools/perf/util/auxtrace.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * auxtrace.h: AUX area trace support
 * Copyright (c) 2013-2015, Intel Corporation.
 */

#ifndef __PERF_AUXTRACE_H
#define __PERF_AUXTRACE_H

#include <sys/types.h>
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h> // FILE
#include <linux/list.h>
#include <linux/perf_event.h>
#include <linux/types.h>
#include <asm/bitsperlong.h>
#include <asm/barrier.h>

union perf_event;
struct perf_session;
struct evlist;
struct evsel;
struct perf_tool;
struct mmap;
struct perf_sample;
struct option;
struct record_opts;
struct perf_record_auxtrace_error;
struct perf_record_auxtrace_info;
struct events_stats;
struct perf_pmu;

enum auxtrace_error_type {
       PERF_AUXTRACE_ERROR_ITRACE  = 1,
       PERF_AUXTRACE_ERROR_MAX
};

/* Auxtrace records must have the same alignment as perf event records */
#define PERF_AUXTRACE_RECORD_ALIGNMENT 8

enum auxtrace_type {
	PERF_AUXTRACE_UNKNOWN,
	PERF_AUXTRACE_INTEL_PT,
	PERF_AUXTRACE_INTEL_BTS,
	PERF_AUXTRACE_CS_ETM,
	PERF_AUXTRACE_ARM_SPE,
	PERF_AUXTRACE_S390_CPUMSF,
};

enum itrace_period_type {
	PERF_ITRACE_PERIOD_INSTRUCTIONS,
	PERF_ITRACE_PERIOD_TICKS,
	PERF_ITRACE_PERIOD_NANOSECS,
};

#define AUXTRACE_ERR_FLG_OVERFLOW	(1 << ('o' - 'a'))
#define AUXTRACE_ERR_FLG_DATA_LOST	(1 << ('l' - 'a'))

#define AUXTRACE_LOG_FLG_ALL_PERF_EVTS	(1 << ('a' - 'a'))

/**
 * struct itrace_synth_opts - AUX area tracing synthesis options.
 * @set: indicates whether or not options have been set
 * @default_no_sample: Default to no sampling.
 * @inject: indicates the event (not just the sample) must be fully synthesized
 *          because 'perf inject' will write it out
 * @instructions: whether to synthesize 'instructions' events
 * @branches: whether to synthesize 'branches' events
 *            (branch misses only for Arm SPE)
 * @transactions: whether to synthesize events for transactions
 * @ptwrites: whether to synthesize events for ptwrites
 * @pwr_events: whether to synthesize power events
 * @other_events: whether to synthesize other events recorded due to the use of
 *                aux_output
 * @errors: whether to synthesize decoder error events
 * @dont_decode: whether to skip decoding entirely
 * @log: write a decoding log
 * @calls: limit branch samples to calls (can be combined with @returns)
 * @returns: limit branch samples to returns (can be combined with @calls)
 * @callchain: add callchain to 'instructions' events
 * @add_callchain: add callchain to existing event records
 * @thread_stack: feed branches to the thread_stack
 * @last_branch: add branch context to 'instruction' events
 * @add_last_branch: add branch context to existing event records
 * @flc: whether to synthesize first level cache events
 * @llc: whether to synthesize last level cache events
 * @tlb: whether to synthesize TLB events
 * @remote_access: whether to synthesize remote access events
 * @callchain_sz: maximum callchain size
 * @last_branch_sz: branch context size
 * @period: 'instructions' events period
 * @period_type: 'instructions' events period type
 * @initial_skip: skip N events at the beginning.
 * @cpu_bitmap: CPUs for which to synthesize events, or NULL for all
 * @ptime_range: time intervals to trace or NULL
 * @range_num: number of time intervals to trace
 * @error_plus_flags: flags to affect what errors are reported
 * @error_minus_flags: flags to affect what errors are reported
 * @log_plus_flags: flags to affect what is logged
 * @log_minus_flags: flags to affect what is logged
 * @quick: quicker (less detailed) decoding
 */
struct itrace_synth_opts {
	bool			set;
	bool			default_no_sample;
	bool			inject;
	bool			instructions;
	bool			branches;
	bool			transactions;
	bool			ptwrites;
	bool			pwr_events;
	bool			other_events;
	bool			errors;
	bool			dont_decode;
	bool			log;
	bool			calls;
	bool			returns;
	bool			callchain;
	bool			add_callchain;
	bool			thread_stack;
	bool			last_branch;
	bool			add_last_branch;
	bool			flc;
	bool			llc;
	bool			tlb;
	bool			remote_access;
	unsigned int		callchain_sz;
	unsigned int		last_branch_sz;
	unsigned long long	period;
	enum itrace_period_type	period_type;
	unsigned long		initial_skip;
	unsigned long		*cpu_bitmap;
	struct perf_time_interval *ptime_range;
	int			range_num;
	unsigned int		error_plus_flags;
	unsigned int		error_minus_flags;
	unsigned int		log_plus_flags;
	unsigned int		log_minus_flags;
	unsigned int		quick;
};

/**
 * struct auxtrace_index_entry - indexes a AUX area tracing event within a
 *                               perf.data file.
 * @file_offset: offset within the perf.data file
 * @sz: size of the event
 */
struct auxtrace_index_entry {
	u64			file_offset;
	u64			sz;
};

#define PERF_AUXTRACE_INDEX_ENTRY_COUNT 256

/**
 * struct auxtrace_index - index of AUX area tracing events within a perf.data
 *                         file.
 * @list: linking a number of arrays of entries
 * @nr: number of entries
 * @entries: array of entries
 */
struct auxtrace_index {
	struct list_head	list;
	size_t			nr;
	struct auxtrace_index_entry entries[PERF_AUXTRACE_INDEX_ENTRY_COUNT];
};

/**
 * struct auxtrace - session callbacks to allow AUX area data decoding.
 * @process_event: lets the decoder see all session events
 * @process_auxtrace_event: process a PERF_RECORD_AUXTRACE event
 * @queue_data: queue an AUX sample or PERF_RECORD_AUXTRACE event for later
 *              processing
 * @dump_auxtrace_sample: dump AUX area sample data
 * @flush_events: process any remaining data
 * @free_events: free resources associated with event processing
 * @free: free resources associated with the session
 */
struct auxtrace {
	int (*process_event)(struct perf_session *session,
			     union perf_event *event,
			     struct perf_sample *sample,
			     struct perf_tool *tool);
	int (*process_auxtrace_event)(struct perf_session *session,
				      union perf_event *event,
				      struct perf_tool *tool);
	int (*queue_data)(struct perf_session *session,
			  struct perf_sample *sample, union perf_event *event,
			  u64 data_offset);
	void (*dump_auxtrace_sample)(struct perf_session *session,
				     struct perf_sample *sample);
	int (*flush_events)(struct perf_session *session,
			    struct perf_tool *tool);
	void (*free_events)(struct perf_session *session);
	void (*free)(struct perf_session *session);
	bool (*evsel_is_auxtrace)(struct perf_session *session,
				  struct evsel *evsel);
};

/**
 * struct auxtrace_buffer - a buffer containing AUX area tracing data.
 * @list: buffers are queued in a list held by struct auxtrace_queue
 * @size: size of the buffer in bytes
 * @pid: in per-thread mode, the pid this buffer is associated with
 * @tid: in per-thread mode, the tid this buffer is associated with
 * @cpu: in per-cpu mode, the cpu this buffer is associated with
 * @data: actual buffer data (can be null if the data has not been loaded)
 * @data_offset: file offset at which the buffer can be read
 * @mmap_addr: mmap address at which the buffer can be read
 * @mmap_size: size of the mmap at @mmap_addr
 * @data_needs_freeing: @data was malloc'd so free it when it is no longer
 *                      needed
 * @consecutive: the original data was split up and this buffer is consecutive
 *               to the previous buffer
 * @offset: offset as determined by aux_head / aux_tail members of struct
 *          perf_event_mmap_page
 * @reference: an implementation-specific reference determined when the data is
 *             recorded
 * @buffer_nr: used to number each buffer
 * @use_size: implementation actually only uses this number of bytes
 * @use_data: implementation actually only uses data starting at this address
 */
struct auxtrace_buffer {
	struct list_head	list;
	size_t			size;
	pid_t			pid;
	pid_t			tid;
	int			cpu;
	void			*data;
	off_t			data_offset;
	void			*mmap_addr;
	size_t			mmap_size;
	bool			data_needs_freeing;
	bool			consecutive;
	u64			offset;
	u64			reference;
	u64			buffer_nr;
	size_t			use_size;
	void			*use_data;
};

/**
 * struct auxtrace_queue - a queue of AUX area tracing data buffers.
 * @head: head of buffer list
 * @tid: in per-thread mode, the tid this queue is associated with
 * @cpu: in per-cpu mode, the cpu this queue is associated with
 * @set: %true once this queue has been dedicated to a specific thread or cpu
 * @priv: implementation-specific data
 */
struct auxtrace_queue {
	struct list_head	head;
	pid_t			tid;
	int			cpu;
	bool			set;
	void			*priv;
};

/**
 * struct auxtrace_queues - an array of AUX area tracing queues.
 * @queue_array: array of queues
 * @nr_queues: number of queues