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