tools/perf/util/auxtrace.h - kernel/msm-4.9 - Gitiles

 /*
  * auxtrace.h: AUX area trace support
  * Copyright (c) 2013-2015, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  */

 #ifndef __PERF_AUXTRACE_H
 #define __PERF_AUXTRACE_H

 #include <sys/types.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <linux/list.h>
 #include <linux/perf_event.h>
 #include <linux/types.h>

 #include "../perf.h"
 #include "event.h"
 #include "session.h"
 #include "debug.h"

 union perf_event;
 struct perf_session;
 struct perf_evlist;
 struct perf_tool;
 struct option;
 struct record_opts;
 struct auxtrace_info_event;
 struct events_stats;

 enum auxtrace_type {
 	PERF_AUXTRACE_UNKNOWN,
 };

 enum itrace_period_type {
 	PERF_ITRACE_PERIOD_INSTRUCTIONS,
 	PERF_ITRACE_PERIOD_TICKS,
 	PERF_ITRACE_PERIOD_NANOSECS,
 };

 /**
  * struct itrace_synth_opts - AUX area tracing synthesis options.
  * @set: indicates whether or not options have been set
  * @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
  * @transactions: whether to synthesize events for transactions
  * @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
  * @callchain_sz: maximum callchain size
  * @period: 'instructions' events period
  * @period_type: 'instructions' events period type
  */
 struct itrace_synth_opts {
 	bool			set;
 	bool			inject;
 	bool			instructions;
 	bool			branches;
 	bool			transactions;
 	bool			errors;
 	bool			dont_decode;
 	bool			log;
 	bool			calls;
 	bool			returns;
 	bool			callchain;
 	unsigned int		callchain_sz;
 	unsigned long long	period;
 	enum itrace_period_type	period_type;
 };

 /**
  * 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
  * @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 (*flush_events)(struct perf_session *session,
 			    struct perf_tool *tool);
 	void (*free_events)(struct perf_session *session);
 	void (*free)(struct perf_session *session);
 };

 /**
  * 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
  * @new_data: set whenever new data is queued
  * @populated: queues have been fully populated using the auxtrace_index
  * @next_buffer_nr: used to number each buffer
  */
 struct auxtrace_queues {
 	struct auxtrace_queue	*queue_array;
 	unsigned int		nr_queues;
 	bool			new_data;
 	bool			populated;
 	u64			next_buffer_nr;
 };

 /**
  * struct auxtrace_heap_item - element of struct auxtrace_heap.
  * @queue_nr: queue number
  * @ordinal: value used for sorting (lowest ordinal is top of the heap) expected
  *           to be a timestamp
  */
 struct auxtrace_heap_item {
 	unsigned int		queue_nr;
 	u64			ordinal;
 };

 /**
  * struct auxtrace_heap - a heap suitable for sorting AUX area tracing queues.
  * @heap_array: the heap
  * @heap_cnt: the number of elements in the heap
  * @heap_sz: maximum number of elements (grows as needed)
  */
 struct auxtrace_heap {
 	struct auxtrace_heap_item	*heap_array;
 	unsigned int		heap_cnt;
 	unsigned int		heap_sz;
 };

 /**
  * struct auxtrace_mmap - records an mmap of the auxtrace buffer.
  * @base: address of mapped area
  * @userpg: pointer to buffer's perf_event_mmap_page
  * @mask: %0 if @len is not a power of two, otherwise (@len - %1)
  * @len: size of mapped area
  * @prev: previous aux_head
  * @idx: index of this mmap
  * @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
  *       mmap) otherwise %0
  * @cpu: cpu number for a per-cpu mmap otherwise %-1
  */
 struct auxtrace_mmap {
 	void		*base;
 	void		*userpg;
 	size_t		mask;
 	size_t		len;
 	u64		prev;
 	int		idx;
 	pid_t		tid;
 	int		cpu;
 };

 /**
  * struct auxtrace_mmap_params - parameters to set up struct auxtrace_mmap.
  * @mask: %0 if @len is not a power of two, otherwise (@len - %1)
  * @offset: file offset of mapped area
  * @len: size of mapped area
  * @prot: mmap memory protection
  * @idx: index of this mmap
  * @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
  *       mmap) otherwise %0
  * @cpu: cpu number for a per-cpu mmap otherwise %-1
  */
 struct auxtrace_mmap_params {
 	size_t		mask;
 	off_t		offset;
 	size_t		len;
 	int		prot;
 	int		idx;
 	pid_t		tid;
 	int		cpu;
 };

 /**
  * struct auxtrace_record - callbacks for recording AUX area data.
  * @recording_options: validate and process recording options
  * @info_priv_size: return the size of the private data in auxtrace_info_event
  * @info_fill: fill-in the private data in auxtrace_info_event
  * @free: free this auxtrace record structure
  * @snapshot_start: starting a snapshot
  * @snapshot_finish: finishing a snapshot
  * @find_snapshot: find data to snapshot within auxtrace mmap
  * @parse_snapshot_options: parse snapshot options
  * @reference: provide a 64-bit reference number for auxtrace_event
  * @read_finish: called after reading from an auxtrace mmap
  */
 struct auxtrace_record {
 	int (*recording_options)(struct auxtrace_record *itr,
 				 struct perf_evlist *evlist,
 				 struct record_opts *opts);
 	size_t (*info_priv_size)(struct auxtrace_record *itr);
 	int (*info_fill)(struct auxtrace_record *itr,
 			 struct perf_session *session,
 			 struct auxtrace_info_event *auxtrace_info,
 			 size_t priv_size);
 	void (*free)(struct auxtrace_record *itr);
 	int (*snapshot_start)(struct auxtrace_record *itr);
 	int (*snapshot_finish)(struct auxtrace_record *itr);
 	int (*find_snapshot)(struct auxtrace_record *itr, int idx,
 			     struct auxtrace_mmap *mm, unsigned char *data,
 			     u64 *head, u64 *old);
 	int (*parse_snapshot_options)(struct auxtrace_record *itr,
 				      struct record_opts *opts,
 				      const char *str);
 	u64 (*reference)(struct auxtrace_record *itr);
 	int (*read_finish)(struct auxtrace_record *itr, int idx);
 	unsigned int alignment;
 };

 #ifdef HAVE_AUXTRACE_SUPPORT

 /*
  * In snapshot mode the mmapped page is read-only which makes using
  * __sync_val_compare_and_swap() problematic.  However, snapshot mode expects
  * the buffer is not updated while the snapshot is made (e.g. Intel PT disables
  * the event) so there is not a race anyway.
  */
 static inline u64 auxtrace_mmap__read_snapshot_head(struct auxtrace_mmap *mm)
 {
 	struct perf_event_mmap_page *pc = mm->userpg;
 	u64 head = ACCESS_ONCE(pc->aux_head);

 	/* Ensure all reads are done after we read the head */
 	rmb();
 	return head;
 }

 static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
 {
 	struct perf_event_mmap_page *pc = mm->userpg;
 #if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
 	u64 head = ACCESS_ONCE(pc->aux_head);
 #else
 	u64 head = __sync_val_compare_and_swap(&pc->aux_head, 0, 0);
 #endif

 	/* Ensure all reads are done after we read the head */
 	rmb();
 	return head;
 }

 static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
 {
 	struct perf_event_mmap_page *pc = mm->userpg;
 #if BITS_PER_LONG != 64 && defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
 	u64 old_tail;
 #endif

 	/* Ensure all reads are done before we write the tail out */
 	mb();
 #if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
 	pc->aux_tail = tail;
 #else
 	do {
 		old_tail = __sync_val_compare_and_swap(&pc->aux_tail, 0, 0);
 	} while (!__sync_bool_compare_and_swap(&pc->aux_tail, old_tail, tail));
 #endif
 }

 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);

 typedef int (*process_auxtrace_t)(struct perf_tool *tool,
 				  union perf_event *event, void *data1,
 				  size_t len1, void *data2, size_t len2);

 int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
 			struct perf_tool *tool, process_auxtrace_t fn);

 int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm,
 				 struct auxtrace_record *itr,
 				 struct perf_tool *tool, process_auxtrace_t fn,
 				 size_t snapshot_size);

 int auxtrace_queues__init(struct auxtrace_queues *queues);
 int auxtrace_queues__add_event(struct auxtrace_queues *queues,
 			       struct perf_session *session,
 			       union perf_event *event, off_t data_offset,
 			       struct auxtrace_buffer **buffer_ptr);
 void auxtrace_queues__free(struct auxtrace_queues *queues);
 int auxtrace_queues__process_index(struct auxtrace_queues *queues,
 				   struct perf_session *session);
 struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
 					      struct auxtrace_buffer *buffer);
 void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd);
 void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer);
 void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer);
 void auxtrace_buffer__free(struct auxtrace_buffer *buffer);

 int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
 		       u64 ordinal);
 void auxtrace_heap__pop(struct auxtrace_heap *heap);
 void auxtrace_heap__free(struct auxtrace_heap *heap);

 struct auxtrace_cache_entry {
 	struct hlist_node hash;
 	u32 key;
 };

 struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
 					   unsigned int limit_percent);
 void auxtrace_cache__free(struct auxtrace_cache *auxtrace_cache);
 void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c);
 void auxtrace_cache__free_entry(struct auxtrace_cache *c, void *entry);
 int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
 			struct auxtrace_cache_entry *entry);
 void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key);

 struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
 					      int *err);

 int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
 				    struct record_opts *opts,
 				    const char *str);
 int auxtrace_record__options(struct auxtrace_record *itr,
 			     struct perf_evlist *evlist,
 			     struct record_opts *opts);
 size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr);
 int auxtrace_record__info_fill(struct auxtrace_record *itr,
 			       struct perf_session *session,
 			       struct auxtrace_info_event *auxtrace_info,
 			       size_t priv_size);
 void auxtrace_record__free(struct auxtrace_record *itr);
 int auxtrace_record__snapshot_start(struct auxtrace_record *itr);
 int auxtrace_record__snapshot_finish(struct auxtrace_record *itr);
 int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
 				   struct auxtrace_mmap *mm,
 				   unsigned char *data, u64 *head, u64 *old);
 u64 auxtrace_record__reference(struct auxtrace_record *itr);

 int auxtrace_index__auxtrace_event(struct list_head *head, union perf_event *event,
 				   off_t file_offset);
 int auxtrace_index__write(int fd, struct list_head *head);
 int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
 			    bool needs_swap);
 void auxtrace_index__free(struct list_head *head);

 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
 			  const char *msg);

 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
 					 struct perf_tool *tool,
 					 struct perf_session *session,
 					 perf_event__handler_t process);
 int perf_event__process_auxtrace_info(struct perf_tool *tool,
 				      union perf_event *event,
 				      struct perf_session *session);
 s64 perf_event__process_auxtrace(struct perf_tool *tool,
 				 union perf_event *event,
 				 struct perf_session *session);
 int perf_event__process_auxtrace_error(struct perf_tool *tool,
 				       union perf_event *event,
 				       struct perf_session *session);
 int itrace_parse_synth_opts(const struct option *opt, const char *str,
 			    int unset);
 void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts);

 size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp);
 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
	/*
	* auxtrace.h: AUX area trace support
	* Copyright (c) 2013-2015, Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	*/

	#ifndef __PERF_AUXTRACE_H
	#define __PERF_AUXTRACE_H

	#include <sys/types.h>
	#include <stdbool.h>
	#include <stddef.h>
	#include <linux/list.h>
	#include <linux/perf_event.h>
	#include <linux/types.h>

	#include "../perf.h"
	#include "event.h"
	#include "session.h"
	#include "debug.h"

	union perf_event;
	struct perf_session;
	struct perf_evlist;
	struct perf_tool;
	struct option;
	struct record_opts;
	struct auxtrace_info_event;
	struct events_stats;

	enum auxtrace_type {
	PERF_AUXTRACE_UNKNOWN,
	};

	enum itrace_period_type {
	PERF_ITRACE_PERIOD_INSTRUCTIONS,
	PERF_ITRACE_PERIOD_TICKS,
	PERF_ITRACE_PERIOD_NANOSECS,
	};

	/**
	* struct itrace_synth_opts - AUX area tracing synthesis options.
	* @set: indicates whether or not options have been set
	* @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
	* @transactions: whether to synthesize events for transactions
	* @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
	* @callchain_sz: maximum callchain size
	* @period: 'instructions' events period
	* @period_type: 'instructions' events period type
	*/
	struct itrace_synth_opts {
	bool set;
	bool inject;
	bool instructions;
	bool branches;
	bool transactions;
	bool errors;
	bool dont_decode;
	bool log;
	bool calls;
	bool returns;
	bool callchain;
	unsigned int callchain_sz;
	unsigned long long period;
	enum itrace_period_type period_type;
	};

	/**
	* 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
	* @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 (flush_events)(struct perf_session session,
	struct perf_tool *tool);
	void (free_events)(struct perf_session session);
	void (free)(struct perf_session session);
	};

	/**
	* 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
	* @new_data: set whenever new data is queued
	* @populated: queues have been fully populated using the auxtrace_index
	* @next_buffer_nr: used to number each buffer
	*/
	struct auxtrace_queues {
	struct auxtrace_queue *queue_array;
	unsigned int nr_queues;
	bool new_data;
	bool populated;
	u64 next_buffer_nr;
	};

	/**
	* struct auxtrace_heap_item - element of struct auxtrace_heap.
	* @queue_nr: queue number
	* @ordinal: value used for sorting (lowest ordinal is top of the heap) expected
	* to be a timestamp
	*/
	struct auxtrace_heap_item {
	unsigned int queue_nr;
	u64 ordinal;
	};

	/**
	* struct auxtrace_heap - a heap suitable for sorting AUX area tracing queues.
	* @heap_array: the heap
	* @heap_cnt: the number of elements in the heap
	* @heap_sz: maximum number of elements (grows as needed)
	*/
	struct auxtrace_heap {
	struct auxtrace_heap_item *heap_array;
	unsigned int heap_cnt;
	unsigned int heap_sz;
	};

	/**
	* struct auxtrace_mmap - records an mmap of the auxtrace buffer.
	* @base: address of mapped area
	* @userpg: pointer to buffer's perf_event_mmap_page
	* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
	* @len: size of mapped area
	* @prev: previous aux_head
	* @idx: index of this mmap
	* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
	* mmap) otherwise %0
	* @cpu: cpu number for a per-cpu mmap otherwise %-1
	*/
	struct auxtrace_mmap {
	void *base;
	void *userpg;
	size_t mask;
	size_t len;
	u64 prev;
	int idx;
	pid_t tid;
	int cpu;
	};

	/**
	* struct auxtrace_mmap_params - parameters to set up struct auxtrace_mmap.
	* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
	* @offset: file offset of mapped area
	* @len: size of mapped area
	* @prot: mmap memory protection
	* @idx: index of this mmap
	* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
	* mmap) otherwise %0
	* @cpu: cpu number for a per-cpu mmap otherwise %-1
	*/
	struct auxtrace_mmap_params {
	size_t mask;
	off_t offset;
	size_t len;
	int prot;
	int idx;
	pid_t tid;
	int cpu;
	};

	/**
	* struct auxtrace_record - callbacks for recording AUX area data.
	* @recording_options: validate and process recording options
	* @info_priv_size: return the size of the private data in auxtrace_info_event
	* @info_fill: fill-in the private data in auxtrace_info_event
	* @free: free this auxtrace record structure
	* @snapshot_start: starting a snapshot
	* @snapshot_finish: finishing a snapshot
	* @find_snapshot: find data to snapshot within auxtrace mmap
	* @parse_snapshot_options: parse snapshot options
	* @reference: provide a 64-bit reference number for auxtrace_event
	* @read_finish: called after reading from an auxtrace mmap
	*/
	struct auxtrace_record {
	int (recording_options)(struct auxtrace_record itr,
	struct perf_evlist *evlist,
	struct record_opts *opts);
	size_t (info_priv_size)(struct auxtrace_record itr);
	int (info_fill)(struct auxtrace_record itr,
	struct perf_session *session,
	struct auxtrace_info_event *auxtrace_info,
	size_t priv_size);
	void (free)(struct auxtrace_record itr);
	int (snapshot_start)(struct auxtrace_record itr);
	int (snapshot_finish)(struct auxtrace_record itr);
	int (find_snapshot)(struct auxtrace_record itr, int idx,
	struct auxtrace_mmap mm, unsigned char data,
	u64 head, u64 old);
	int (parse_snapshot_options)(struct auxtrace_record itr,
	struct record_opts *opts,
	const char *str);
	u64 (reference)(struct auxtrace_record itr);
	int (read_finish)(struct auxtrace_record itr, int idx);
	unsigned int alignment;
	};

	#ifdef HAVE_AUXTRACE_SUPPORT

	/*
	* In snapshot mode the mmapped page is read-only which makes using
	* __sync_val_compare_and_swap() problematic. However, snapshot mode expects
	* the buffer is not updated while the snapshot is made (e.g. Intel PT disables
	* the event) so there is not a race anyway.
	*/
	static inline u64 auxtrace_mmap__read_snapshot_head(struct auxtrace_mmap *mm)
	{
	struct perf_event_mmap_page *pc = mm->userpg;
	u64 head = ACCESS_ONCE(pc->aux_head);

	/* Ensure all reads are done after we read the head */
	rmb();
	return head;
	}

	static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
	{
	struct perf_event_mmap_page *pc = mm->userpg;
	#if BITS_PER_LONG == 64 \|\| !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
	u64 head = ACCESS_ONCE(pc->aux_head);
	#else
	u64 head = __sync_val_compare_and_swap(&pc->aux_head, 0, 0);
	#endif

	/* Ensure all reads are done after we read the head */
	rmb();
	return head;
	}

	static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
	{
	struct perf_event_mmap_page *pc = mm->userpg;
	#if BITS_PER_LONG != 64 && defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
	u64 old_tail;
	#endif

	/* Ensure all reads are done before we write the tail out */
	mb();
	#if BITS_PER_LONG == 64 \|\| !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
	pc->aux_tail = tail;
	#else
	do {
	old_tail = __sync_val_compare_and_swap(&pc->aux_tail, 0, 0);
	} while (!__sync_bool_compare_and_swap(&pc->aux_tail, old_tail, tail));
	#endif
	}

	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);

	typedef int (process_auxtrace_t)(struct perf_tool tool,
	union perf_event event, void data1,
	size_t len1, void *data2, size_t len2);

	int auxtrace_mmap__read(struct auxtrace_mmap mm, struct auxtrace_record itr,
	struct perf_tool *tool, process_auxtrace_t fn);

	int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm,
	struct auxtrace_record *itr,
	struct perf_tool *tool, process_auxtrace_t fn,
	size_t snapshot_size);

	int auxtrace_queues__init(struct auxtrace_queues *queues);
	int auxtrace_queues__add_event(struct auxtrace_queues *queues,
	struct perf_session *session,
	union perf_event *event, off_t data_offset,
	struct auxtrace_buffer **buffer_ptr);
	void auxtrace_queues__free(struct auxtrace_queues *queues);
	int auxtrace_queues__process_index(struct auxtrace_queues *queues,
	struct perf_session *session);
	struct auxtrace_buffer auxtrace_buffer__next(struct auxtrace_queue queue,
	struct auxtrace_buffer *buffer);
	void auxtrace_buffer__get_data(struct auxtrace_buffer buffer, int fd);
	void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer);
	void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer);
	void auxtrace_buffer__free(struct auxtrace_buffer *buffer);

	int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
	u64 ordinal);
	void auxtrace_heap__pop(struct auxtrace_heap *heap);
	void auxtrace_heap__free(struct auxtrace_heap *heap);

	struct auxtrace_cache_entry {
	struct hlist_node hash;
	u32 key;
	};

	struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
	unsigned int limit_percent);
	void auxtrace_cache__free(struct auxtrace_cache *auxtrace_cache);
	void auxtrace_cache__alloc_entry(struct auxtrace_cache c);
	void auxtrace_cache__free_entry(struct auxtrace_cache c, void entry);
	int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
	struct auxtrace_cache_entry *entry);
	void auxtrace_cache__lookup(struct auxtrace_cache c, u32 key);

	struct auxtrace_record auxtrace_record__init(struct perf_evlist evlist,
	int *err);

	int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
	struct record_opts *opts,
	const char *str);
	int auxtrace_record__options(struct auxtrace_record *itr,
	struct perf_evlist *evlist,
	struct record_opts *opts);
	size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr);
	int auxtrace_record__info_fill(struct auxtrace_record *itr,
	struct perf_session *session,
	struct auxtrace_info_event *auxtrace_info,
	size_t priv_size);
	void auxtrace_record__free(struct auxtrace_record *itr);
	int auxtrace_record__snapshot_start(struct auxtrace_record *itr);
	int auxtrace_record__snapshot_finish(struct auxtrace_record *itr);
	int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
	struct auxtrace_mmap *mm,
	unsigned char data, u64 head, u64 *old);
	u64 auxtrace_record__reference(struct auxtrace_record *itr);

	int auxtrace_index__auxtrace_event(struct list_head head, union perf_event event,
	off_t file_offset);
	int auxtrace_index__write(int fd, struct list_head *head);
	int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
	bool needs_swap);
	void auxtrace_index__free(struct list_head *head);

	void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
	int code, int cpu, pid_t pid, pid_t tid, u64 ip,
	const char *msg);

	int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
	struct perf_tool *tool,
	struct perf_session *session,
	perf_event__handler_t process);
	int perf_event__process_auxtrace_info(struct perf_tool *tool,
	union perf_event *event,
	struct perf_session *session);
	s64 perf_event__process_auxtrace(struct perf_tool *tool,
	union perf_event *event,
	struct perf_session *session);
	int perf_event__process_auxtrace_error(struct perf_tool *tool,
	union perf_event *event,
	struct perf_session *session);
	int itrace_parse_synth_opts(const struct option opt, const char str,
	int unset);
	void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts);

	size_t perf_event__fprintf_auxtrace_error(union perf_event event, FILE fp);
	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