overlay: Primitive integration with perf

We can now record when a pageflip occurs by listening for the flip
tracepoint. Merely proof of principle at this point.

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

1 files changed, 18 insertions, 0 deletions

diff --git a/overlay/gpu-perf.h b/overlay/gpu-perf.h
new file mode 100644
index 00000000..58bf3062
--- /dev/null
+++ b/overlay/gpu-perf.h
@@ -0,0 +1,18 @@
+#include <stdint.h>
+
+struct gpu_perf {
+	int page_size;
+	int nr_cpus;
+	int nr_events;
+	int *fd;
+	void **map;
+	struct gpu_perf_sample {
+		uint64_t id;
+		int (*func)(struct gpu_perf *, void *);
+	} *sample;
+
+	int flip_complete;
+};
+
+void gpu_perf_init(struct gpu_perf *gp, unsigned flags);
+int gpu_perf_update(struct gpu_perf *gp);