/*
* 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);
};
#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__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
