From 25fcb1c23dc5318b103d6c096b2dcfaea98dad3d Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 31 Jan 2019 14:21:35 +0000 Subject: lib: Add GPU power measurement Read the RAPL power metrics courtesy of perf. Or your local HW equivalent? v2: uselocale() v3: Use gpu_power_s(), gpu_power_J(), gpu_power_W() to try and make the scale factors self-consistent. v4: Use igt_sysfs v5: s/tN/sampleN/ Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Reviewed-by: Tvrtko Ursulin --- lib/igt_gpu_power.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 lib/igt_gpu_power.h (limited to 'lib/igt_gpu_power.h') diff --git a/lib/igt_gpu_power.h b/lib/igt_gpu_power.h new file mode 100644 index 00000000..a578a02a0 --- /dev/null +++ b/lib/igt_gpu_power.h @@ -0,0 +1,66 @@ +/* + * Copyright © 2019 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + */ + +#ifndef IGT_GPU_POWER_H +#define IGT_GPU_POWER_H + +#include +#include + +struct gpu_power { + int fd; + double scale; +}; + +struct gpu_power_sample { + uint64_t energy; + uint64_t time; +}; + +int gpu_power_open(struct gpu_power *power); +bool gpu_power_read(struct gpu_power *power, struct gpu_power_sample *s); +void gpu_power_close(struct gpu_power *power); + +static inline double gpu_power_J(const struct gpu_power *p, + const struct gpu_power_sample *p0, + const struct gpu_power_sample *p1) +{ + return (p1->energy - p0->energy) * p->scale; +} + +static inline double gpu_power_s(const struct gpu_power *p, + const struct gpu_power_sample *p0, + const struct gpu_power_sample *p1) +{ + return (p1->time - p0->time) * 1e-9; +} + +static inline double gpu_power_W(const struct gpu_power *p, + const struct gpu_power_sample *p0, + const struct gpu_power_sample *p1) +{ + return gpu_power_J(p, p0, p1) / gpu_power_s(p, p0, p1); +} + +#endif /* IGT_GPU_POWER_H */ -- cgit v1.2.3