- 根目录:
- tools
- perf
- util
- auxtrace.c
/*
* auxtrace.c: 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.
*
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <stdbool.h>
#include <linux/kernel.h>
#include <linux/perf_event.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/string.h>
#include <sys/param.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <linux/list.h>
#include "../perf.h"
#include "util.h"
#include "evlist.h"
#include "cpumap.h"
#include "thread_map.h"
#include "asm/bug.h"
#include "auxtrace.h"
#include <linux/hash.h>
#include "event.h"
#include "session.h"
#include "debug.h"
#include "parse-options.h"
#include "intel-pt.h"
#include "intel-bts.h"
int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
struct auxtrace_mmap_params *mp,
void *userpg, int fd)
{
struct perf_event_mmap_page *pc = userpg;
WARN_ONCE(mm->base, "Uninitialized auxtrace_mmap\n");
mm->userpg = userpg;
mm->mask = mp->mask;
mm->len = mp->len;
mm->prev = 0;
mm->idx = mp->idx;
mm->tid = mp->tid;
mm->cpu = mp->cpu;
if (!mp->len) {
mm->base = NULL;
return 0;
}
#if BITS_PER_LONG != 64 && !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
pr_err("Cannot use AUX area tracing mmaps\n");
return -1;
#endif
pc->aux_offset = mp->offset;
pc->aux_size = mp->len;
mm->base = mmap(NULL, mp->len, mp->prot, MAP_SHARED, fd, mp->offset);
if (mm->base == MAP_FAILED) {
pr_debug2("failed to mmap AUX area\n");
mm->base = NULL;
return -1;
}
return 0;
}
void auxtrace_mmap__munmap(struct auxtrace_mmap *mm)
{
if (mm->base) {
munmap(mm->base, mm->len);
mm->base = NULL;
}
}
void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
off_t auxtrace_offset,
unsigned int auxtrace_pages,
bool auxtrace_overwrite)
{
if (auxtrace_pages) {
mp->offset = auxtrace_offset;
mp->len = auxtrace_pages * (size_t)page_size;
mp->mask = is_power_of_2(mp->len) ? mp->len - 1 : 0;
mp->prot = PROT_READ | (auxtrace_overwrite ? 0 : PROT_WRITE);
pr_debug2("AUX area mmap length %zu\n", mp->len);
} else {
mp->len = 0;
}
}
void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
struct perf_evlist *evlist, int idx,
bool per_cpu)
{
mp->idx = idx;
if (per_cpu) {
mp->cpu = evlist->cpus->map[idx];
if (evlist->threads)
mp->tid = thread_map__pid(evlist->threads, 0);
else
mp->tid = -1;
} else {
mp->cpu = -1;
mp->tid = thread_map__pid(evlist->threads, idx);
}
}
#define AUXTRACE_INIT_NR_QUEUES 32
static struct auxtrace_queue *auxtrace_alloc_queue_array(unsigned int nr_queues)
{
struct auxtrace_queue *queue_array;
unsigned int max_nr_queues, i;
max_nr_queues = UINT_MAX / sizeof(struct auxtrace_queue);
if (nr_queues > max_nr_queues)
return NULL;
queue_array = calloc(nr_queues, sizeof(struct auxtrace_queue));
if (!queue_array)
return NULL;
for (i = 0; i < nr_queues; i++) {
INIT_LIST_HEAD(&queue_array[i].head);
queue_array[i].priv = NULL;
}
return queue_array;
}
int auxtrace_queues__init(struct auxtrace_queues *queues)
{
queues->nr_queues = AUXTRACE_INIT_NR_QUEUES;
queues->queue_array = auxtrace_alloc_queue_array(queues->nr_queues);
if (!queues->queue_array)
return -ENOMEM;
return 0;
}
static int auxtrace_queues__grow(struct auxtrace_queues *queues,
unsigned int new_nr_queues)
{
unsigned int nr_queues = queues->nr_queues;
struct auxtrace_queue *queue_array;
unsigned int i;
if (!nr_queues)
nr_queues = AUXTRACE_INIT_NR_QUEUES;
while (nr_queues && nr_queues < new_nr_queues)
nr_queues <<= 1;
if (nr_queues < queues->nr_queues || nr_queues < new_nr_queues)
return -EINVAL;
queue_array = auxtrace_alloc_queue_array(nr_queues);
if (!queue_array)
return -ENOMEM;
for (i = 0; i < queues->nr_queues; i++) {
list_splice_tail(&queues->queue_array[i].head,
&queue_array[i].head);
queue_array[i].priv = queues->queue_array[i].priv;
}
queues->nr_queues = nr_queues;
queues->queue_array = queue_array;
return 0;
}
static void *auxtrace_copy_data(u64 size, struct perf_session *session)
{
int fd = perf_data_file__fd(session->file);
void *p;
ssize_t ret;
if (size > SSIZE_MAX)
return NULL;
p = malloc(size);
if (!p)
return NULL;
ret = readn(fd, p, size);
if (ret != (ssize_t)size) {
free(p);
return NULL;
}
return p;
}
static int auxtrace_queues__add_buffer(struct auxtrace_queues *queues,
unsigned int idx,
struct auxtrace_buffer *buffer)
{
struct auxtrace_queue *queue;
int err;
if (idx >= queues->nr_queues) {
err = auxtrace_queues__grow(queues, idx + 1);
if (err)
return err;
}
queue = &queues->queue_array[idx];
if (!queue->set) {
queue->set = true;
queue->tid = buffer->tid;
queue->cpu = buffer->cpu;
} else if (buffer->cpu != queue->cpu || buffer->tid != queue->tid) {
pr_err("auxtrace queue conflict: cpu %d, tid %d vs cpu %d, tid %d\n",
queue->cpu, queue->tid, buffer->cpu, buffer->tid);
return -EINVAL;
}
buffer->buffer_nr = queues->next_buffer_nr++;
list_add_tail(&buffer->list, &queue->head);
queues->new_data = true;
queues->populated = true;
return 0;
}
/* Limit buffers to 32MiB on 32-bit */
#define BUFFER_LIMIT_FOR_32_BIT (32 * 1024 * 1024)
static int auxtrace_queues__split_buffer(struct auxtrace_queues *queues,
unsigned int idx,
struct auxtrace_buffer *buffer)
{
u64 sz = buffer->size;
bool consecutive = false;
struct auxtrace_buffer *b;
int err;
while (sz > BUFFER_LIMIT_FOR_32_BIT) {
b = memdup(buffer, sizeof(struct auxtrace_buffer));
if (!b)
return -ENOMEM;
b->size = BUFFER_LIMIT_FOR_32_BIT;
b->consecutive = consecutive;
err = auxtrace_queues__add_buffer(queues, idx, b);
if (err) {
auxtrace_buffer__free(b);
return err;
}
buffer->data_offset += BUFFER_LIMIT_FOR_32_BIT;
sz -= BUFFER_LIMIT_FOR_32_BIT;
consecutive = true;
}
buffer->size = sz;
buffer->consecutive = consecutive;
return 0;
}
static int auxtrace_queues__add_event_buffer(struct auxtrace_queues *queues,
struct perf_session *session,
unsigned int idx,
struct auxtrace_buffer *buffer)
{
if (session->one_mmap) {
buffer->data = buffer->data_offset - session->one_mmap_offset +
session->one_mmap_addr;
} else if (perf_data_file__is_pipe(session->file)) {
buffer->data = auxtrace_copy_data(buffer->size, session);
if (!buffer->data)
return -ENOMEM;
buffer->data_needs_freeing = true;
} else if (BITS_PER_LONG == 32 &&
buffer->size > BUFFER_LIMIT_FOR_32_BIT) {
int err;
err = auxtrace_queues__split_buffer(queues, idx, buffer);
if (err)
return err;
}
return auxtrace_queues__add_buffer(queues, idx, buffer);
}
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)
{
struct auxtrace_buffer *buffer;
unsigned int idx;
int err;
buffer = zalloc(sizeof(struct auxtrace_buffer));
if (!buffer)
return -ENOMEM;
buffer->pid = -1;
buffer->tid = event->auxtrace.tid;
buffer->cpu = event->auxtrace.cpu;
buffer->data_offset = data_offset;
buffer->offset = event->auxtrace.offset;
buffer->reference = event->auxtrace.reference;
buffer->size = event->auxtrace.size;
idx = event->auxtrace.idx;
err = auxtrace_queues__add_event_buffer(queues, session, idx, buffer);
if (err)
goto out_err;
if (buffer_ptr)
*buffer_ptr = buffer;
return 0;
out_err:
auxtrace_buffer__free(buffer);
return err;
}
static int auxtrace_queues__add_indexed_event(struct auxtrace_queues *queues,
struct perf_session *session,
off_t file_offset, size_t sz)
{
union perf_event *event;
int err;
char buf[PERF_SAMPLE_MAX_SIZE];
err = perf_session__peek_event(session, file_offset, buf,
PERF_SAMPLE_MAX_SIZE, &event, NULL);
if (err)
return err;
if (event->header.type == PERF_RECORD_AUXTRACE) {
if (event->header.size < sizeof(struct auxtrace_event) ||
event->header.size != sz) {
err = -EINVAL;
goto out;
}
file_offset += event->header.size;
err = auxtrace_queues__add_event(queues, session, event,
file_offset, NULL);
}
out:
return err;
}
void auxtrace_queues__free(struct auxtrace_queues *queues)
{
unsigned int i;
for (i = 0; i < queues->nr_queues; i++) {
while (!list_empty(&queues->queue_array[i].head)) {
struct auxtrace_buffer *buffer;
buffer = list_entry(queues->queue_array[i].head.next,
struct auxtrace_buffer, list);
list_del(&buffer->list);
auxtrace_buffer__free(buffer);
}
}
zfree(&queues->queue_array);
queues->nr_queues = 0;
}
static void auxtrace_heapify(struct auxtrace_heap_item *heap_array,
unsigned int pos, unsigned int queue_nr,
u64 ordinal)
{
unsigned int parent;
while (pos) {
parent = (pos - 1) >> 1;
if (heap_array[parent].ordinal <= ordinal)
break;
heap_array[pos] = heap_array[parent];
pos = parent;
}
heap_array[pos].queue_nr = queue_nr;
heap_array[pos].ordinal = ordinal;
}
int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
u64 ordinal)
{
struct auxtrace_heap_item *heap_array;
if (queue_nr >= heap->heap_sz) {
unsigned int heap_sz = AUXTRACE_INIT_NR_QUEUES;
while (heap_sz <= queue_nr)
heap_sz <<= 1;
heap_array = realloc(heap->heap_array,
heap_sz * sizeof(struct auxtrace_heap_item));
if (!heap_array)
return -ENOMEM;
heap->heap_array = heap_array;
heap->heap_sz = heap_sz;
}
auxtrace_heapify(heap->heap_array, heap->heap_cnt++, queue_nr, ordinal);
return 0;
}
void auxtrace_heap__free(struct auxtrace_heap *heap)
{
zfree(&heap->heap_array);
heap->heap_cnt = 0;
heap->heap_sz = 0;
}
void auxtrace_heap__pop(struct auxtrace_heap *heap)
{
unsigned int pos, last, heap_cnt = heap->heap_cnt;
struct auxtrace_heap_item *heap_array;
if (!heap_cnt)
return;
heap->heap_cnt -= 1;
heap_array = heap->heap_array;
pos = 0;
while (1) {
unsigned int left, right;
left = (pos << 1) + 1;
if (left >= heap_cnt)
break;
right = left + 1;
if (right >= heap_cnt) {
heap_array[pos] = heap_array[left];
return;
}
if (heap_array[left].ordinal < heap_array[right].ordinal) {
heap_array[pos] = heap_array[left];
pos = left;
} else {
heap_array[pos] = heap_array[right];
pos = right;
}
}
last = heap_cnt - 1;
auxtrace_heapify(heap_array, pos, heap_array[last].queue_nr,
heap_array[last].ordinal);
}
size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr)
{
if (itr)
return itr->info_priv_size(itr);
return 0;
}
static int auxtrace_not_supported(void)
{
pr_err("AUX area tracing is not supported on this architecture\n");
return -EINVAL;
}
int auxtrace_record__info_fill(struct auxtrace_record *itr,
struct perf_session *session,
struct auxtrace_info_event *auxtrace_info,
size_t priv_size)
{
if (itr)
return itr->info_fill(itr, session, auxtrace_info, priv_size);
return auxtrace_not_supported();
}
void auxtrace_record__free(struct auxtrace_record *itr)
{
if (itr)
itr->free(itr);
}
int auxtrace_record__snapshot_start(struct auxtrace_record *itr)
{
if (itr && itr->snapshot_start)
return itr->snapshot_start(itr);
return 0;
}
int auxtrace_record__snapshot_finish(struct auxtrace_record *itr)
{
if (itr && itr->snapshot_finish)
return itr->snapshot_finish(itr);
return 0;
}
int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
struct auxtrace_mmap *mm,
unsigned char *data, u64 *head, u64 *old)
{
if (itr && itr->find_snapshot)
return itr->find_snapshot(itr, idx, mm, data, head, old);
return 0;
}
int auxtrace_record__options(struct auxtrace_record *itr,
struct perf_evlist *evlist,
struct record_opts *opts)
{
if (itr)
return itr->recording_options(itr, evlist, opts);
return 0;
}
u64 auxtrace_record__reference(struct auxtrace_record *itr)
{
if (itr)
return itr->reference(itr);
return 0;
}
int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
struct record_opts *opts, const char *str)
{
if (!str)
return 0;
if (itr)
return itr->parse_snapshot_options(itr, opts, str);
pr_err("No AUX area tracing to snapshot\n");
return -EINVAL;
}
struct auxtrace_record *__weak
auxtrace_record__init(struct perf_evlist *evlist __maybe_unused, int *err)
{
*err = 0;
return NULL;
}
static int auxtrace_index__alloc(struct list_head *head)
{
struct auxtrace_index *auxtrace_index;
auxtrace_index = malloc(sizeof(struct auxtrace_index));
if (!auxtrace_index)
return -ENOMEM;
auxtrace_index->nr = 0;
INIT_LIST_HEAD(&auxtrace_index->list);
list_add_tail(&auxtrace_index->list, head);
return 0;
}
void auxtrace_index__free(struct list_head *head)
{
struct auxtrace_index *auxtrace_index, *n;
list_for_each_entry_safe(auxtrace_index, n, head, list) {
list_del(&auxtrace_index->list);
free(auxtrace_index);
}
}
static struct auxtrace_index *auxtrace_index__last(struct list_head *head)
{
struct auxtrace_index *auxtrace_index;
int err;
if (list_empty(head)) {
err = auxtrace_index__alloc(head);
if (err)
return NULL;
}
auxtrace_index = list_entry(head->prev, struct auxtrace_index, list);
if (auxtrace_index->nr >= PERF_AUXTRACE_INDEX_ENTRY_COUNT) {
err = auxtrace_index__alloc(head);
if (err)
return NULL;
auxtrace_index = list_entry(head->prev, struct auxtrace_index,
list);
}
return auxtrace_index;
}
int auxtrace_index__auxtrace_event(struct list_head *head,
union perf_event *event, off_t file_offset)
{
struct auxtrace_index *auxtrace_index;
size_t nr;
auxtrace_index = auxtrace_index__last(head);
if (!auxtrace_index)
return -ENOMEM;
nr = auxtrace_index->nr;
auxtrace_index->entries[nr].file_offset = file_offset;
auxtrace_index->entries[nr].sz = event->header.size;
auxtrace_index->nr += 1;
return 0;
}
static int auxtrace_index__do_write(int fd,
struct auxtrace_index *auxtrace_index)
{
struct auxtrace_index_entry ent;
size_t i;
for (i = 0; i < auxtrace_index->nr; i++) {
ent.file_offset = auxtrace_index->entries[i].file_offset;
ent.sz = auxtrace_index->entries[i].sz;
if (writen(fd, &ent, sizeof(ent)) != sizeof(ent))
return -errno;
}
return 0;
}
int auxtrace_index__write(int fd, struct list_head *head)
{
struct auxtrace_index *auxtrace_index;
u64 total = 0;
int err;
list_for_each_entry(auxtrace_index, head, list)
total += auxtrace_index->nr;
if (writen(fd, &total, sizeof(total)) != sizeof(total))
return -errno;
list_for_each_entry(auxtrace_index, head, list) {
err = auxtrace_index__do_write(fd, auxtrace_index);
if (err)
return err;
}
return 0;
}
static int auxtrace_index__process_entry(int fd, struct list_head *head,
bool needs_swap)
{
struct auxtrace_index *auxtrace_index;
struct auxtrace_index_entry ent;
size_t nr;
if (readn(fd, &ent, sizeof(ent)) != sizeof(ent))
return -1;
auxtrace_index = auxtrace_index__last(head);
if (!auxtrace_index)
return -1;
nr = auxtrace_index->nr;
if (needs_swap) {
auxtrace_index->entries[nr].file_offset =
bswap_64(ent.file_offset);
auxtrace_index->entries[nr].sz = bswap_64(ent.sz);
} else {
auxtrace_index->entries[nr].file_offset = ent.file_offset;
auxtrace_index->entries[nr].sz = ent.sz;
}
auxtrace_index->nr = nr + 1;
return 0;
}
int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
bool needs_swap)
{
struct list_head *head = &session->auxtrace_index;
u64 nr;
if (readn(fd, &nr, sizeof(u64)) != sizeof(u64))
return -1;
if (needs_swap)
nr = bswap_64(nr);
if (sizeof(u64) + nr * sizeof(struct auxtrace_index_entry) > size)
return -1;
while (nr--) {
int err;
err = auxtrace_index__process_entry(fd, head, needs_swap);
if (err)
return -1;
}
return 0;
}
static int auxtrace_queues__process_index_entry(struct auxtrace_queues *queues,
struct perf_session *session,
struct auxtrace_index_entry *ent)
{
return auxtrace_queues__add_indexed_event(queues, session,
ent->file_offset, ent->sz);
}
int auxtrace_queues__process_index(struct auxtrace_queues *queues,
struct perf_session *session)
{
struct auxtrace_index *auxtrace_index;
struct auxtrace_index_entry *ent;
size_t i;
int err;
list_for_each_entry(auxtrace_index, &session->auxtrace_index, list) {
for (i = 0; i < auxtrace_index->nr; i++) {
ent = &auxtrace_index->entries[i];
err = auxtrace_queues__process_index_entry(queues,
session,
ent);
if (err)
return err;
}
}
return 0;
}
struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
struct auxtrace_buffer *buffer)
{
if (buffer) {
if (list_is_last(&buffer->list, &queue->head))
return NULL;
return list_entry(buffer->list.next, struct auxtrace_buffer,
list);
} else {
if (list_empty(&queue->head))
return NULL;
return list_entry(queue->head.next, struct auxtrace_buffer,
list);
}
}
void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
{
size_t adj = buffer->data_offset & (page_size - 1);
size_t size = buffer->size + adj;
off_t file_offset = buffer->data_offset - adj;
void *addr;
if (buffer->data)
return buffer->data;
addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, file_offset);
if (addr == MAP_FAILED)
return NULL;
buffer->mmap_addr = addr;
buffer->mmap_size = size;
buffer->data = addr + adj;
return buffer->data;
}
void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer)
{
if (!buffer->data || !buffer->mmap_addr)
return;
munmap(buffer->mmap_addr, buffer->mmap_size);
buffer->mmap_addr = NULL;
buffer->mmap_size = 0;
buffer->data = NULL;
buffer->use_data = NULL;
}
void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer)
{
auxtrace_buffer__put_data(buffer);
if (buffer->data_needs_freeing) {
buffer->data_needs_freeing = false;
zfree(&buffer->data);
buffer->use_data = NULL;
buffer->size = 0;
}
}
void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
{
auxtrace_buffer__drop_data(buffer);
free(buffer);
}
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)
{
size_t size;
memset(auxtrace_error, 0, sizeof(struct auxtrace_error_event));
auxtrace_error->header.type = PERF_RECORD_AUXTRACE_ERROR;
auxtrace_error->type = type;
auxtrace_error->code = code;
auxtrace_error->cpu = cpu;
auxtrace_error->pid = pid;
auxtrace_error->tid = tid;
auxtrace_error->ip = ip;
strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
strlen(auxtrace_error->msg) + 1;
auxtrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
}
int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
struct perf_tool *tool,
struct perf_session *session,
perf_event__handler_t process)
{
union perf_event *ev;
size_t priv_size;
int err;
pr_debug2("Synthesizing auxtrace information\n");
priv_size = auxtrace_record__info_priv_size(itr);
ev = zalloc(sizeof(struct auxtrace_info_event) + priv_size);
if (!ev)
return -ENOMEM;
ev->auxtrace_info.header.type = PERF_RECORD_AUXTRACE_INFO;
ev->auxtrace_info.header.size = sizeof(struct auxtrace_info_event) +
priv_size;
err = auxtrace_record__info_fill(itr, session, &ev->auxtrace_info,
priv_size);
if (err)
goto out_free;
err = process(tool, ev, NULL, NULL);
out_free:
free(ev);
return err;
}
static bool auxtrace__dont_decode(struct perf_session *session)
{
return !session->itrace_synth_opts ||
session->itrace_synth_opts->dont_decode;
}
int perf_event__process_auxtrace_info(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_session *session)
{
enum auxtrace_type type = event->auxtrace_info.type;
if (dump_trace)
fprintf(stdout, " type: %u\n", type);
switch (type) {
case PERF_AUXTRACE_INTEL_PT:
return intel_pt_process_auxtrace_info(event, session);
case PERF_AUXTRACE_INTEL_BTS:
return intel_bts_process_auxtrace_info(event, session);
case PERF_AUXTRACE_UNKNOWN:
default:
return -EINVAL;
}
}
s64 perf_event__process_auxtrace(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session)
{
s64 err;
if (dump_trace)
fprintf(stdout, " size: %#"PRIx64" offset: %#"PRIx64" ref: %#"PRIx64" idx: %u tid: %d cpu: %d\n",
event->auxtrace.size, event->auxtrace.offset,
event->auxtrace.reference, event->auxtrace.idx,
event->auxtrace.tid, event->auxtrace.cpu);
if (auxtrace__dont_decode(session))
return event->auxtrace.size;
if (!session->auxtrace || event->header.type != PERF_RECORD_AUXTRACE)
return -EINVAL;
err = session->auxtrace->process_auxtrace_event(session, event, tool);
if (err < 0)
return err;
return event->auxtrace.size;
}
#define PERF_ITRACE_DEFAULT_PERIOD_TYPE PERF_ITRACE_PERIOD_NANOSECS
#define PERF_ITRACE_DEFAULT_PERIOD 100000
#define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ 16
#define PERF_ITRACE_MAX_CALLCHAIN_SZ 1024
#define PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ 64
#define PERF_ITRACE_MAX_LAST_BRANCH_SZ 1024
void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
{
synth_opts->instructions = true;
synth_opts->branches = true;
synth_opts->transactions = true;
synth_opts->errors = true;
synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
synth_opts->last_branch_sz = PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
}
/*
* Please check tools/perf/Documentation/perf-script.txt for information
* about the options parsed here, which is introduced after this cset,
* when support in 'perf script' for these options is introduced.
*/
int itrace_parse_synth_opts(const struct option *opt, const char *str,
int unset)
{
struct itrace_synth_opts *synth_opts = opt->value;
const char *p;
char *endptr;
bool period_type_set = false;
bool period_set = false;
synth_opts->set = true;
if (unset) {
synth_opts->dont_decode = true;
return 0;
}
if (!str) {
itrace_synth_opts__set_default(synth_opts);
return 0;
}
for (p = str; *p;) {
switch (*p++) {
case 'i':
synth_opts->instructions = true;
while (*p == ' ' || *p == ',')
p += 1;
if (isdigit(*p)) {
synth_opts->period = strtoull(p, &endptr, 10);
period_set = true;
p = endptr;
while (*p == ' ' || *p == ',')
p += 1;
switch (*p++) {
case 'i':
synth_opts->period_type =
PERF_ITRACE_PERIOD_INSTRUCTIONS;
period_type_set = true;
break;
case 't':
synth_opts->period_type =
PERF_ITRACE_PERIOD_TICKS;
period_type_set = true;
break;
case 'm':
synth_opts->period *= 1000;
/* Fall through */
case 'u':
synth_opts->period *= 1000;
/* Fall through */
case 'n':
if (*p++ != 's')
goto out_err;
synth_opts->period_type =
PERF_ITRACE_PERIOD_NANOSECS;
period_type_set = true;
break;
case '\0':
goto out;
default:
goto out_err;
}
}
break;
case 'b':
synth_opts->branches = true;
break;
case 'x':
synth_opts->transactions = true;
break;
case 'e':
synth_opts->errors = true;
break;
case 'd':
synth_opts->log = true;
break;
case 'c':
synth_opts->branches = true;
synth_opts->calls = true;
break;
case 'r':
synth_opts->branches = true;
synth_opts->returns = true;
break;
case 'g':
synth_opts->callchain = true;
synth_opts->callchain_sz =
PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
while (*p == ' ' || *p == ',')
p += 1;
if (isdigit(*p)) {
unsigned int val;
val = strtoul(p, &endptr, 10);
p = endptr;
if (!val || val > PERF_ITRACE_MAX_CALLCHAIN_SZ)
goto out_err;
synth_opts->callchain_sz = val;
}
break;
case 'l':
synth_opts->last_branch = true;
synth_opts->last_branch_sz =
PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
while (*p == ' ' || *p == ',')
p += 1;
if (isdigit(*p)) {
unsigned int val;
val = strtoul(p, &endptr, 10);
p = endptr;
if (!val ||
val > PERF_ITRACE_MAX_LAST_BRANCH_SZ)
goto out_err;
synth_opts->last_branch_sz = val;
}
break;
case ' ':
case ',':
break;
default:
goto out_err;
}
}
out:
if (synth_opts->instructions) {
if (!period_type_set)
synth_opts->period_type =
PERF_ITRACE_DEFAULT_PERIOD_TYPE;
if (!period_set)
synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
}
return 0;
out_err:
pr_err("Bad Instruction Tracing options '%s'\n", str);
return -EINVAL;
}
static const char * const auxtrace_error_type_name[] = {
[PERF_AUXTRACE_ERROR_ITRACE] = "instruction trace",
};
static const char *auxtrace_error_name(int type)
{
const char *error_type_name = NULL;
if (type < PERF_AUXTRACE_ERROR_MAX)
error_type_name = auxtrace_error_type_name[type];
if (!error_type_name)
error_type_name = "unknown AUX";
return error_type_name;
}
size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
{
struct auxtrace_error_event *e = &event->auxtrace_error;
int ret;
ret = fprintf(fp, " %s error type %u",
auxtrace_error_name(e->type), e->type);
ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
return ret;
}
void perf_session__auxtrace_error_inc(struct perf_session *session,
union perf_event *event)
{
struct auxtrace_error_event *e = &event->auxtrace_error;
if (e->type < PERF_AUXTRACE_ERROR_MAX)
session->evlist->stats.nr_auxtrace_errors[e->type] += 1;
}
void events_stats__auxtrace_error_warn(const struct events_stats *stats)
{
int i;
for (i = 0; i < PERF_AUXTRACE_ERROR_MAX; i++) {
if (!stats->nr_auxtrace_errors[i])
continue;
ui__warning("%u %s errors\n",
stats->nr_auxtrace_errors[i],
auxtrace_error_name(i));
}
}
int perf_event__process_auxtrace_error(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_session *session)
{
if (auxtrace__dont_decode(session))
return 0;
perf_event__fprintf_auxtrace_error(event, stdout);
return 0;
}
static int __auxtrace_mmap__read(struct auxtrace_mmap *mm,
struct auxtrace_record *itr,
struct perf_tool *tool, process_auxtrace_t fn,
bool snapshot, size_t snapshot_size)
{
u64 head, old = mm->prev, offset, ref;
unsigned char *data = mm->base;
size_t size, head_off, old_off, len1, len2, padding;
union perf_event ev;
void *data1, *data2;
if (snapshot) {
head = auxtrace_mmap__read_snapshot_head(mm);
if (auxtrace_record__find_snapshot(itr, mm->idx, mm, data,
&head, &old))
return -1;
} else {
head = auxtrace_mmap__read_head(mm);
}
if (old == head)
return 0;
pr_debug3("auxtrace idx %d old %#"PRIx64" head %#"PRIx64" diff %#"PRIx64"\n",
mm->idx, old, head, head - old);
if (mm->mask) {
head_off = head & mm->mask;
old_off = old & mm->mask;
} else {
head_off = head % mm->len;
old_off = old % mm->len;
}
if (head_off > old_off)
size = head_off - old_off;
else
size = mm->len - (old_off - head_off);
if (snapshot && size > snapshot_size)
size = snapshot_size;
ref = auxtrace_record__reference(itr);
if (head > old || size <= head || mm->mask) {
offset = head - size;
} else {
/*
* When the buffer size is not a power of 2, 'head' wraps at the
* highest multiple of the buffer size, so we have to subtract
* the remainder here.
*/
u64 rem = (0ULL - mm->len) % mm->len;
offset = head - size - rem;
}
if (size > head_off) {
len1 = size - head_off;
data1 = &data[mm->len - len1];
len2 = head_off;
data2 = &data[0];
} else {
len1 = size;
data1 = &data[head_off - len1];
len2 = 0;
data2 = NULL;
}
if (itr->alignment) {
unsigned int unwanted = len1 % itr->alignment;
len1 -= unwanted;
size -= unwanted;
}
/* padding must be written by fn() e.g. record__process_auxtrace() */
padding = size & 7;
if (padding)
padding = 8 - padding;
memset(&ev, 0, sizeof(ev));
ev.auxtrace.header.type = PERF_RECORD_AUXTRACE;
ev.auxtrace.header.size = sizeof(ev.auxtrace);
ev.auxtrace.size = size + padding;
ev.auxtrace.offset = offset;
ev.auxtrace.reference = ref;
ev.auxtrace.idx = mm->idx;
ev.auxtrace.tid = mm->tid;
ev.auxtrace.cpu = mm->cpu;
if (fn(tool, &ev, data1, len1, data2, len2))
return -1;
mm->prev = head;
if (!snapshot) {
auxtrace_mmap__write_tail(mm, head);
if (itr->read_finish) {
int err;
err = itr->read_finish(itr, mm->idx);
if (err < 0)
return err;
}
}
return 1;
}
int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
struct perf_tool *tool, process_auxtrace_t fn)
{
return __auxtrace_mmap__read(mm, itr, tool, fn, false, 0);
}
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)
{
return __auxtrace_mmap__read(mm, itr, tool, fn, true, snapshot_size);
}
/**
* struct auxtrace_cache - hash table to implement a cache
* @hashtable: the hashtable
* @sz: hashtable size (number of hlists)
* @entry_size: size of an entry
* @limit: limit the number of entries to this maximum, when reached the cache
* is dropped and caching begins again with an empty cache
* @cnt: current number of entries
* @bits: hashtable size (@sz = 2^@bits)
*/
struct auxtrace_cache {
struct hlist_head *hashtable;
size_t sz;
size_t entry_size;
size_t limit;
size_t cnt;
unsigned int bits;
};
struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
unsigned int limit_percent)
{
struct auxtrace_cache *c;
struct hlist_head *ht;
size_t sz, i;
c = zalloc(sizeof(struct auxtrace_cache));
if (!c)
return NULL;
sz = 1UL << bits;
ht = calloc(sz, sizeof(struct hlist_head));
if (!ht)
goto out_free;
for (i = 0; i < sz; i++)
INIT_HLIST_HEAD(&ht[i]);
c->hashtable = ht;
c->sz = sz;
c->entry_size = entry_size;
c->limit = (c->sz * limit_percent) / 100;
c->bits = bits;
return c;
out_free:
free(c);
return NULL;
}
static void auxtrace_cache__drop(struct auxtrace_cache *c)
{
struct auxtrace_cache_entry *entry;
struct hlist_node *tmp;
size_t i;
if (!c)
return;
for (i = 0; i < c->sz; i++) {
hlist_for_each_entry_safe(entry, tmp, &c->hashtable[i], hash) {
hlist_del(&entry->hash);
auxtrace_cache__free_entry(c, entry);
}
}
c->cnt = 0;
}
void auxtrace_cache__free(struct auxtrace_cache *c)
{
if (!c)
return;
auxtrace_cache__drop(c);
free(c->hashtable);
free(c);
}
void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c)
{
return malloc(c->entry_size);
}
void auxtrace_cache__free_entry(struct auxtrace_cache *c __maybe_unused,
void *entry)
{
free(entry);
}
int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
struct auxtrace_cache_entry *entry)
{
if (c->limit && ++c->cnt > c->limit)
auxtrace_cache__drop(c);
entry->key = key;
hlist_add_head(&entry->hash, &c->hashtable[hash_32(key, c->bits)]);
return 0;
}
void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key)
{
struct auxtrace_cache_entry *entry;
struct hlist_head *hlist;
if (!c)
return NULL;
hlist = &c->hashtable[hash_32(key, c->bits)];
hlist_for_each_entry(entry, hlist, hash) {
if (entry->key == key)
return entry;
}
return NULL;
}