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, 17 insertions, 0 deletions

diff --git a/src/gallium/drivers/panfrost/pan_context.h b/src/gallium/drivers/panfrost/pan_context.h
index b1a0a09146d..091d9988698 100644
--- a/src/gallium/drivers/panfrost/pan_context.h
+++ b/src/gallium/drivers/panfrost/pan_context.h
@@ -74,6 +74,11 @@ struct panfrost_query {
         struct panfrost_transfer transfer;
 };
 
+struct panfrost_fence {
+        struct pipe_reference reference;
+        int fd;
+};
+
 #define PANFROST_MAX_TRANSIENT_ENTRIES 64
 
 struct panfrost_transient_pool {
@@ -208,6 +213,18 @@ struct panfrost_context {
         struct pipe_blend_color blend_color;
         struct pipe_depth_stencil_alpha_state *depth_stencil;
         struct pipe_stencil_ref stencil_ref;
+
+        /* True for t6XX, false for t8xx. */
+        bool is_t6xx;
+
+        /* If set, we'll require the use of single render-target framebuffer
+         * descriptors (SFBD), for older hardware -- specifically, <T760 hardware, If
+         * false, we'll use the MFBD no matter what. New hardware -does- retain support
+         * for SFBD, and in theory we could flip between them on a per-RT basis, but
+         * there's no real advantage to doing so */
+        bool require_sfbd;
+
+	uint32_t out_sync;
 };
 
 /* Corresponds to the CSO */