88 lines
1.5 KiB
C
88 lines
1.5 KiB
C
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <math.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include "igt_gpu_power.h"
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#include "igt_perf.h"
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#include "igt_sysfs.h"
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struct rapl {
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uint64_t power, type;
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double scale;
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};
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static int rapl_parse(struct rapl *r)
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{
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locale_t locale, oldlocale;
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bool result;
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int dir;
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memset(r, 0, sizeof(*r));
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dir = open("/sys/devices/power", O_RDONLY);
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if (dir < 0)
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return -errno;
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/* Replace user environment with plain C to match kernel format */
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locale = newlocale(LC_ALL, "C", 0);
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oldlocale = uselocale(locale);
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result = true;
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result &= igt_sysfs_scanf(dir, "type",
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"%"PRIu64, &r->type) == 1;
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result &= igt_sysfs_scanf(dir, "events/energy-gpu",
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"event=%"PRIx64, &r->power) == 1;
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result &= igt_sysfs_scanf(dir, "events/energy-gpu.scale",
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"%lf", &r->scale) == 1;
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uselocale(oldlocale);
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freelocale(locale);
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close(dir);
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if (!result)
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return -EINVAL;
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if (isnan(r->scale) || !r->scale)
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return -ERANGE;
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return 0;
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}
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int gpu_power_open(struct gpu_power *power)
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{
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struct rapl r;
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power->fd = rapl_parse(&r);
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if (power->fd < 0)
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goto err;
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power->fd = igt_perf_open(r.type, r.power);
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if (power->fd < 0) {
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power->fd = -errno;
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goto err;
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}
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power->scale = r.scale;
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return 0;
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err:
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errno = 0;
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return power->fd;
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}
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bool gpu_power_read(struct gpu_power *power, struct gpu_power_sample *s)
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{
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return read(power->fd, s, sizeof(*s)) == sizeof(*s);
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}
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void gpu_power_close(struct gpu_power *power)
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{
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close(power->fd);
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}
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