lib: Generalise rapl interface

We can use our existing rapl interface that monitors gpu power, to also
sample the other rapl domains such as package, cores and ram.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/lib/igt_rapl.h b/lib/igt_rapl.h
new file mode 100644
index 00000000..55c46198
--- /dev/null
+++ b/lib/igt_rapl.h
@@ -0,0 +1,95 @@
+/*
+ * 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_RAPL_H
+#define IGT_RAPL_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct rapl {
+	uint64_t power, type;
+	double scale;
+	int fd;
+};
+
+struct power_sample {
+	uint64_t energy;
+	uint64_t time;
+};
+
+int rapl_open(struct rapl *r, const char *domain);
+
+static inline int cpu_power_open(struct rapl *r)
+{
+	return rapl_open(r, "cpu");
+}
+
+static inline int gpu_power_open(struct rapl *r)
+{
+	return rapl_open(r, "gpu");
+}
+
+static inline int pkg_power_open(struct rapl *r)
+{
+	return rapl_open(r, "pkg");
+}
+
+static inline int ram_power_open(struct rapl *r)
+{
+	return rapl_open(r, "ram");
+}
+
+static inline bool rapl_read(struct rapl *r, struct power_sample *s)
+{
+	return read(r->fd, s, sizeof(*s)) == sizeof(*s);
+}
+
+static inline void rapl_close(struct rapl *r)
+{
+	close(r->fd);
+}
+
+static inline double power_J(const struct rapl *r,
+			     const struct power_sample *p0,
+			     const struct power_sample *p1)
+{
+	return (p1->energy - p0->energy) * r->scale;
+}
+
+static inline double power_s(const struct rapl *r,
+			     const struct power_sample *p0,
+			     const struct power_sample *p1)
+{
+	return (p1->time - p0->time) * 1e-9;
+}
+
+static inline double power_W(const struct rapl *r,
+			     const struct power_sample *p0,
+			     const struct power_sample *p1)
+{
+	return power_J(r, p0, p1) / power_s(r, p0, p1);
+}
+
+#endif /* IGT_RAPL_H */