From 273e66baef8bf930959c503041b68411bb42ff80 Mon Sep 17 00:00:00 2001
From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Date: Tue, 10 Oct 2017 08:22:30 +0100
Subject: intel-gpu-overlay: Use RAPL PMU for power reading

Wire up to the RAPL PMU for GPU energy readings.

The only complication is that we have to add code to parse:

 # cat /sys/devices/power/events/energy-gpu.scale
 2.3283064365386962890625e-10

v2: Link with -lm.
v3: strtod can handle scientific notation, even though my initial
    reading of the man page did not spot that. (Chris Wilson)
v4: Meson fix.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 overlay/power.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'overlay/power.h')

diff --git a/overlay/power.h b/overlay/power.h
index bf8346ce..28abfc32 100644
--- a/overlay/power.h
+++ b/overlay/power.h
@@ -39,6 +39,8 @@ struct power {
 	int new_sample;
 
 	uint64_t power_mW;
+
+	double rapl_scale;
 };
 
 int power_init(struct power *power);
-- 
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