overlay: Add rc6 residency

Not much point at the moment since we use forcewake to continuously
probe the GPU busyness. But that will eventually change to a more
power-efficient in-kernel.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 21 insertions, 0 deletions

diff --git a/overlay/rc6.h b/overlay/rc6.h
new file mode 100644
index 00000000..3a166b69
--- /dev/null
+++ b/overlay/rc6.h
@@ -0,0 +1,21 @@
+#include <stdint.h>
+
+struct rc6 {
+	struct rc6_stat {
+		uint64_t rc6_residency;
+		uint64_t rc6p_residency;
+		uint64_t rc6pp_residency;
+		uint64_t timestamp;
+	} stat[2];
+
+	int count;
+	int error;
+
+	uint8_t rc6;
+	uint8_t rc6p;
+	uint8_t rc6pp;
+	uint8_t rc6_combined;
+};
+
+int rc6_init(struct rc6 *rc6);
+int rc6_update(struct rc6 *rc6);