panfrost: Add backend targeting the DRM driver

This backend interacts with the new DRM driver for Midgard GPUs which is
currently in development.

When using this backend, Panfrost has roughly on-par functionality as
when using the non-DRM driver from Arm.

Alyssa Rosenzweig: To do so, we implement additional routines for
runtime GPU version detection and fencing. We cleanup some duplicate
code interfering with the new driver. We fix a long-standing memory leak
which is aggravated on the new driver. Finally, we implement BO
import/export in a way compatible with the new driver. These changes are
squashed to preserve bisectability given the hard-to-track ABI shifts in
the nondrm module

Signed-off-by: Tomeu Vizoso <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>

1 files changed, 12 insertions, 7 deletions

diff --git a/src/gallium/drivers/panfrost/pan_screen.h b/src/gallium/drivers/panfrost/pan_screen.h
index 0005b2feb15..882611e93e3 100644
--- a/src/gallium/drivers/panfrost/pan_screen.h
+++ b/src/gallium/drivers/panfrost/pan_screen.h
@@ -49,9 +49,11 @@ struct panfrost_screen;
 
 struct panfrost_driver {
 	struct panfrost_bo * (*import_bo) (struct panfrost_screen *screen, struct winsys_handle *whandle);
+	int (*export_bo) (struct panfrost_screen *screen, int gem_handle, struct winsys_handle *whandle);
 
 	int (*submit_vs_fs_job) (struct panfrost_context *ctx, bool has_draws, bool is_scanout);
-	void (*force_flush_fragment) (struct panfrost_context *ctx);
+	void (*force_flush_fragment) (struct panfrost_context *ctx,
+				      struct pipe_fence_handle **fence);
 	void (*allocate_slab) (struct panfrost_screen *screen,
 		               struct panfrost_memory *mem,
 		               size_t pages,
@@ -65,6 +67,15 @@ struct panfrost_driver {
                              struct panfrost_bo *bo);
         void (*enable_counters) (struct panfrost_screen *screen);
         void (*dump_counters) (struct panfrost_screen *screen);
+	unsigned (*query_gpu_version) (struct panfrost_screen *screen);
+	int (*init_context) (struct panfrost_context *ctx);
+	void (*fence_reference) (struct pipe_screen *screen,
+                         struct pipe_fence_handle **ptr,
+                         struct pipe_fence_handle *fence);
+	boolean (*fence_finish) (struct pipe_screen *screen,
+                      struct pipe_context *ctx,
+                      struct pipe_fence_handle *fence,
+                      uint64_t timeout);
 };
 
 struct panfrost_screen {
@@ -85,10 +96,4 @@ struct panfrost_screen {
 	int last_fragment_flushed;
 };
 
-static inline struct panfrost_screen *
-panfrost_screen( struct pipe_screen *pipe )
-{
-        return (struct panfrost_screen *)pipe;
-}
-
 #endif /* PAN_SCREEN_H */