340 lines
6.7 KiB
C
340 lines
6.7 KiB
C
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "util.h"
|
|
#include "header.h"
|
|
|
|
/*
|
|
* Create new perf.data header attribute:
|
|
*/
|
|
struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
|
|
{
|
|
struct perf_header_attr *self = malloc(sizeof(*self));
|
|
|
|
if (!self)
|
|
die("nomem");
|
|
|
|
self->attr = *attr;
|
|
self->ids = 0;
|
|
self->size = 1;
|
|
self->id = malloc(sizeof(u64));
|
|
|
|
if (!self->id)
|
|
die("nomem");
|
|
|
|
return self;
|
|
}
|
|
|
|
void perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
|
|
{
|
|
int pos = self->ids;
|
|
|
|
self->ids++;
|
|
if (self->ids > self->size) {
|
|
self->size *= 2;
|
|
self->id = realloc(self->id, self->size * sizeof(u64));
|
|
if (!self->id)
|
|
die("nomem");
|
|
}
|
|
self->id[pos] = id;
|
|
}
|
|
|
|
/*
|
|
* Create new perf.data header:
|
|
*/
|
|
struct perf_header *perf_header__new(void)
|
|
{
|
|
struct perf_header *self = malloc(sizeof(*self));
|
|
|
|
if (!self)
|
|
die("nomem");
|
|
|
|
self->frozen = 0;
|
|
|
|
self->attrs = 0;
|
|
self->size = 1;
|
|
self->attr = malloc(sizeof(void *));
|
|
|
|
if (!self->attr)
|
|
die("nomem");
|
|
|
|
self->data_offset = 0;
|
|
self->data_size = 0;
|
|
|
|
return self;
|
|
}
|
|
|
|
void perf_header__add_attr(struct perf_header *self,
|
|
struct perf_header_attr *attr)
|
|
{
|
|
int pos = self->attrs;
|
|
|
|
if (self->frozen)
|
|
die("frozen");
|
|
|
|
self->attrs++;
|
|
if (self->attrs > self->size) {
|
|
self->size *= 2;
|
|
self->attr = realloc(self->attr, self->size * sizeof(void *));
|
|
if (!self->attr)
|
|
die("nomem");
|
|
}
|
|
self->attr[pos] = attr;
|
|
}
|
|
|
|
#define MAX_EVENT_NAME 64
|
|
|
|
struct perf_trace_event_type {
|
|
u64 event_id;
|
|
char name[MAX_EVENT_NAME];
|
|
};
|
|
|
|
static int event_count;
|
|
static struct perf_trace_event_type *events;
|
|
|
|
void perf_header__push_event(u64 id, const char *name)
|
|
{
|
|
if (strlen(name) > MAX_EVENT_NAME)
|
|
printf("Event %s will be truncated\n", name);
|
|
|
|
if (!events) {
|
|
events = malloc(sizeof(struct perf_trace_event_type));
|
|
if (!events)
|
|
die("nomem");
|
|
} else {
|
|
events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
|
|
if (!events)
|
|
die("nomem");
|
|
}
|
|
memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
|
|
events[event_count].event_id = id;
|
|
strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
|
|
event_count++;
|
|
}
|
|
|
|
char *perf_header__find_event(u64 id)
|
|
{
|
|
int i;
|
|
for (i = 0 ; i < event_count; i++) {
|
|
if (events[i].event_id == id)
|
|
return events[i].name;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const char *__perf_magic = "PERFFILE";
|
|
|
|
#define PERF_MAGIC (*(u64 *)__perf_magic)
|
|
|
|
struct perf_file_section {
|
|
u64 offset;
|
|
u64 size;
|
|
};
|
|
|
|
struct perf_file_attr {
|
|
struct perf_event_attr attr;
|
|
struct perf_file_section ids;
|
|
};
|
|
|
|
struct perf_file_header {
|
|
u64 magic;
|
|
u64 size;
|
|
u64 attr_size;
|
|
struct perf_file_section attrs;
|
|
struct perf_file_section data;
|
|
struct perf_file_section event_types;
|
|
};
|
|
|
|
static void do_write(int fd, void *buf, size_t size)
|
|
{
|
|
while (size) {
|
|
int ret = write(fd, buf, size);
|
|
|
|
if (ret < 0)
|
|
die("failed to write");
|
|
|
|
size -= ret;
|
|
buf += ret;
|
|
}
|
|
}
|
|
|
|
void perf_header__write(struct perf_header *self, int fd)
|
|
{
|
|
struct perf_file_header f_header;
|
|
struct perf_file_attr f_attr;
|
|
struct perf_header_attr *attr;
|
|
int i;
|
|
|
|
lseek(fd, sizeof(f_header), SEEK_SET);
|
|
|
|
|
|
for (i = 0; i < self->attrs; i++) {
|
|
attr = self->attr[i];
|
|
|
|
attr->id_offset = lseek(fd, 0, SEEK_CUR);
|
|
do_write(fd, attr->id, attr->ids * sizeof(u64));
|
|
}
|
|
|
|
|
|
self->attr_offset = lseek(fd, 0, SEEK_CUR);
|
|
|
|
for (i = 0; i < self->attrs; i++) {
|
|
attr = self->attr[i];
|
|
|
|
f_attr = (struct perf_file_attr){
|
|
.attr = attr->attr,
|
|
.ids = {
|
|
.offset = attr->id_offset,
|
|
.size = attr->ids * sizeof(u64),
|
|
}
|
|
};
|
|
do_write(fd, &f_attr, sizeof(f_attr));
|
|
}
|
|
|
|
self->event_offset = lseek(fd, 0, SEEK_CUR);
|
|
self->event_size = event_count * sizeof(struct perf_trace_event_type);
|
|
if (events)
|
|
do_write(fd, events, self->event_size);
|
|
|
|
|
|
self->data_offset = lseek(fd, 0, SEEK_CUR);
|
|
|
|
f_header = (struct perf_file_header){
|
|
.magic = PERF_MAGIC,
|
|
.size = sizeof(f_header),
|
|
.attr_size = sizeof(f_attr),
|
|
.attrs = {
|
|
.offset = self->attr_offset,
|
|
.size = self->attrs * sizeof(f_attr),
|
|
},
|
|
.data = {
|
|
.offset = self->data_offset,
|
|
.size = self->data_size,
|
|
},
|
|
.event_types = {
|
|
.offset = self->event_offset,
|
|
.size = self->event_size,
|
|
},
|
|
};
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
|
do_write(fd, &f_header, sizeof(f_header));
|
|
lseek(fd, self->data_offset + self->data_size, SEEK_SET);
|
|
|
|
self->frozen = 1;
|
|
}
|
|
|
|
static void do_read(int fd, void *buf, size_t size)
|
|
{
|
|
while (size) {
|
|
int ret = read(fd, buf, size);
|
|
|
|
if (ret < 0)
|
|
die("failed to read");
|
|
if (ret == 0)
|
|
die("failed to read: missing data");
|
|
|
|
size -= ret;
|
|
buf += ret;
|
|
}
|
|
}
|
|
|
|
struct perf_header *perf_header__read(int fd)
|
|
{
|
|
struct perf_header *self = perf_header__new();
|
|
struct perf_file_header f_header;
|
|
struct perf_file_attr f_attr;
|
|
u64 f_id;
|
|
|
|
int nr_attrs, nr_ids, i, j;
|
|
|
|
lseek(fd, 0, SEEK_SET);
|
|
do_read(fd, &f_header, sizeof(f_header));
|
|
|
|
if (f_header.magic != PERF_MAGIC ||
|
|
f_header.size != sizeof(f_header) ||
|
|
f_header.attr_size != sizeof(f_attr))
|
|
die("incompatible file format");
|
|
|
|
nr_attrs = f_header.attrs.size / sizeof(f_attr);
|
|
lseek(fd, f_header.attrs.offset, SEEK_SET);
|
|
|
|
for (i = 0; i < nr_attrs; i++) {
|
|
struct perf_header_attr *attr;
|
|
off_t tmp;
|
|
|
|
do_read(fd, &f_attr, sizeof(f_attr));
|
|
tmp = lseek(fd, 0, SEEK_CUR);
|
|
|
|
attr = perf_header_attr__new(&f_attr.attr);
|
|
|
|
nr_ids = f_attr.ids.size / sizeof(u64);
|
|
lseek(fd, f_attr.ids.offset, SEEK_SET);
|
|
|
|
for (j = 0; j < nr_ids; j++) {
|
|
do_read(fd, &f_id, sizeof(f_id));
|
|
|
|
perf_header_attr__add_id(attr, f_id);
|
|
}
|
|
perf_header__add_attr(self, attr);
|
|
lseek(fd, tmp, SEEK_SET);
|
|
}
|
|
|
|
if (f_header.event_types.size) {
|
|
lseek(fd, f_header.event_types.offset, SEEK_SET);
|
|
events = malloc(f_header.event_types.size);
|
|
if (!events)
|
|
die("nomem");
|
|
do_read(fd, events, f_header.event_types.size);
|
|
event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
|
|
}
|
|
self->event_offset = f_header.event_types.offset;
|
|
self->event_size = f_header.event_types.size;
|
|
|
|
self->data_offset = f_header.data.offset;
|
|
self->data_size = f_header.data.size;
|
|
|
|
lseek(fd, self->data_offset, SEEK_SET);
|
|
|
|
self->frozen = 1;
|
|
|
|
return self;
|
|
}
|
|
|
|
u64 perf_header__sample_type(struct perf_header *header)
|
|
{
|
|
u64 type = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < header->attrs; i++) {
|
|
struct perf_header_attr *attr = header->attr[i];
|
|
|
|
if (!type)
|
|
type = attr->attr.sample_type;
|
|
else if (type != attr->attr.sample_type)
|
|
die("non matching sample_type");
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
struct perf_event_attr *
|
|
perf_header__find_attr(u64 id, struct perf_header *header)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < header->attrs; i++) {
|
|
struct perf_header_attr *attr = header->attr[i];
|
|
int j;
|
|
|
|
for (j = 0; j < attr->ids; j++) {
|
|
if (attr->id[j] == id)
|
|
return &attr->attr;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|