v3d: Expose the dma-buf modifiers query.

This allows DRI3 to pick between UIF and raster according to whether we're
pageflipping or not and whether the pageflipping display can do UIF,
avoiding copies for the windowed/composited case that previously was
forced to linear.

Improves windowed glmark2 -b build:use-vbo=false performance by 30.7783%
+/- 13.1719% (n=3)

1 files changed, 29 insertions, 0 deletions

diff --git a/src/gallium/drivers/v3d/v3d_screen.c b/src/gallium/drivers/v3d/v3d_screen.c
index 7ccf5b143ff..c810fbc98b4 100644
--- a/src/gallium/drivers/v3d/v3d_screen.c
+++ b/src/gallium/drivers/v3d/v3d_screen.c
@@ -40,6 +40,7 @@
 #include "v3d_context.h"
 #include "v3d_resource.h"
 #include "compiler/v3d_compiler.h"
+#include "drm-uapi/drm_fourcc.h"
 
 static const char *
 v3d_screen_get_name(struct pipe_screen *pscreen)
@@ -512,6 +513,33 @@ v3d_screen_get_compiler_options(struct pipe_screen *pscreen,
         return &v3d_nir_options;
 }
 
+static void
+v3d_screen_query_dmabuf_modifiers(struct pipe_screen *pscreen,
+                                  enum pipe_format format, int max,
+                                  uint64_t *modifiers,
+                                  unsigned int *external_only,
+                                  int *count)
+{
+        int i;
+        uint64_t available_modifiers[] = {
+                DRM_FORMAT_MOD_BROADCOM_UIF,
+                DRM_FORMAT_MOD_LINEAR,
+        };
+        int num_modifiers = ARRAY_SIZE(available_modifiers);
+
+        if (!modifiers) {
+                *count = num_modifiers;
+                return;
+        }
+
+        *count = MIN2(max, num_modifiers);
+        for (i = 0; i < *count; i++) {
+                modifiers[i] = available_modifiers[i];
+                if (external_only)
+                        external_only[i] = false;
+       }
+}
+
 struct pipe_screen *
 v3d_screen_create(int fd, struct renderonly *ro)
 {
@@ -561,6 +589,7 @@ v3d_screen_create(int fd, struct renderonly *ro)
         pscreen->get_vendor = v3d_screen_get_vendor;
         pscreen->get_device_vendor = v3d_screen_get_vendor;
         pscreen->get_compiler_options = v3d_screen_get_compiler_options;
+        pscreen->query_dmabuf_modifiers = v3d_screen_query_dmabuf_modifiers;
 
         return pscreen;