Introduce intel-gpu-overlay

A realtime display of GPU activity. Note, this is just at the point of
minimum usability...

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

1 files changed, 22 insertions, 0 deletions

diff --git a/overlay/gpu-top.h b/overlay/gpu-top.h
new file mode 100644
index 00000000..78f4daf2
--- /dev/null
+++ b/overlay/gpu-top.h
@@ -0,0 +1,22 @@
+#define MAX_RINGS 4
+
+#include <stdint.h>
+
+struct gpu_top {
+	int fd;
+	int num_rings;
+	struct gpu_top_ring {
+		const char *name;
+		union gpu_top_payload {
+			struct {
+				uint8_t busy;
+				uint8_t wait;
+				uint8_t sema;
+			} u;
+			uint32_t payload;
+		} u;
+	} ring[MAX_RINGS];
+};
+
+void gpu_top_init(struct gpu_top *gt);
+int gpu_top_update(struct gpu_top *gt);