#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
#include "header.h"
#include "../perf.h"
#include "trace-event.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 = calloc(sizeof(*self), 1);
if (!self)
die("nomem");
self->size = 1;
self->attr = malloc(sizeof(void *));
if (!self->attr)
die("nomem");
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)
pr_warning("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;
DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
};
void perf_header__feat_trace_info(struct perf_header *header)
{
set_bit(HEADER_TRACE_INFO, header->adds_features);
}
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;
}
}
static void perf_header__adds_write(struct perf_header *self, int fd)
{
struct perf_file_section trace_sec;
u64 cur_offset = lseek(fd, 0, SEEK_CUR);
unsigned long *feat_mask = self->adds_features;
if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
/* Write trace info */
trace_sec.offset = lseek(fd, sizeof(trace_sec), SEEK_CUR);
read_tracing_data(fd, attrs, nr_counters);
trace_sec.size = lseek(fd, 0, SEEK_CUR) - trace_sec.offset;
/* Write trace info headers */
lseek(fd, cur_offset, SEEK_SET);
do_write(fd, &trace_sec, sizeof(trace_sec));
/*
* Update cur_offset. So that other (future)
* features can set their own infos in this place. But if we are
* the only feature, at least that seeks to the place the data
* should begin.
*/
cur_offset = lseek(fd, trace_sec.offset + trace_sec.size, SEEK_SET);
}
};
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);
perf_header__adds_write(self, fd);
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,
},
};
memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
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;
}
}
static void perf_header__adds_read(struct perf_header *self, int fd)
{
const unsigned long *feat_mask = self->adds_features;
if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
struct perf_file_section trace_sec;
do_read(fd, &trace_sec, sizeof(trace_sec));
lseek(fd, trace_sec.offset, SEEK_SET);
trace_report(fd);
lseek(fd, trace_sec.offset + trace_sec.size, SEEK_SET);
}
};
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.attr_size != sizeof(f_attr))
die("incompatible file format");
if (f_header.size != sizeof(f_header)) {
/* Support the previous format */
if (f_header.size == offsetof(typeof(f_header), adds_features))
bitmap_zero(f_header.adds_features, HEADER_FEAT_BITS);
else
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);
}
memcpy(&self->adds_features, &f_header.adds_features, sizeof(f_header.adds_features));
perf_header__adds_read(self, fd);
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;
}
