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#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/sysinfo.h>
#include "igt_perf.h"
uint64_t i915_type_id(void)
{
char buf[64];
ssize_t ret;
int fd;
fd = open("/sys/bus/event_source/devices/i915/type", O_RDONLY);
if (fd < 0)
return 0;
ret = read(fd, buf, sizeof(buf) - 1);
close(fd);
if (ret < 1)
return 0;
buf[ret] = '\0';
return strtoull(buf, NULL, 0);
}
static int
_perf_open(uint64_t type, uint64_t config, int group, uint64_t format)
{
struct perf_event_attr attr = { };
int nr_cpus = get_nprocs_conf();
int cpu = 0, ret;
attr.type = type;
if (attr.type == 0)
return -ENOENT;
if (group >= 0)
format &= ~PERF_FORMAT_GROUP;
attr.read_format = format;
attr.config = config;
do {
ret = perf_event_open(&attr, -1, cpu++, group, 0);
} while ((ret < 0 && errno == EINVAL) && (cpu < nr_cpus));
return ret;
}
int perf_i915_open(uint64_t config)
{
return _perf_open(i915_type_id(), config, -1,
PERF_FORMAT_TOTAL_TIME_ENABLED);
}
int perf_i915_open_group(uint64_t config, int group)
{
return _perf_open(i915_type_id(), config, group,
PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_GROUP);
}
int igt_perf_open(uint64_t type, uint64_t config)
{
return _perf_open(type, config, -1,
PERF_FORMAT_TOTAL_TIME_ENABLED);
}
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