mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 14:02:10 +00:00
7c6a1c65bb
Create a structured file format that includes the full perf_counter_attr and all its relevant counter IDs so that the reporting program has full information. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
243 lines
4.4 KiB
C
243 lines
4.4 KiB
C
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "util.h"
|
|
#include "header.h"
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
struct perf_header_attr *perf_header_attr__new(struct perf_counter_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;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
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;
|
|
}
|
|
|
|
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_counter_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;
|
|
};
|
|
|
|
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->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,
|
|
},
|
|
};
|
|
|
|
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");
|
|
|
|
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 = lseek(fd, 0, SEEK_CUR);
|
|
|
|
do_read(fd, &f_attr, sizeof(f_attr));
|
|
|
|
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);
|
|
}
|
|
|
|
self->data_offset = f_header.data.offset;
|
|
self->data_size = f_header.data.size;
|
|
|
|
lseek(fd, self->data_offset + self->data_size, SEEK_SET);
|
|
|
|
self->frozen = 1;
|
|
|
|
return self;
|
|
}
|