radv: add RADV_DEBUG=extra_md

This enables the use of UMD metadata v2. This allows tools (eg umr)
import buffers.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21984>

docs/envvars.rst

@@ -1063,6 +1063,8 @@ RADV driver environment variables
       validate the LLVM IR before LLVM compiles the shader
    ``epilogs``
       dump fragment shader epilogs
+   ``extra_md``
+      add extra information in bo metadatas to help tools (umr)
    ``forcecompress``
       Enables DCC,FMASK,CMASK,HTILE in situations where the driver supports it
       but normally does not deem it beneficial.

src/amd/vulkan/radv_debug.h

@@ -68,6 +68,7 @@ enum {
    RADV_DEBUG_DUMP_EPILOGS = 1ull << 37,
    RADV_DEBUG_NO_FMASK = 1ull << 38,
    RADV_DEBUG_SHADOW_REGS = 1ull << 39,
+   RADV_DEBUG_EXTRA_MD = 1ull << 40,
 };
 
 enum {

src/amd/vulkan/radv_image.c

@@ -1443,7 +1443,7 @@ radv_query_opaque_metadata(struct radv_device *device, struct radv_image *image,
 
    ac_surface_compute_umd_metadata(&device->physical_device->rad_info, &image->planes[0].surface,
                                    image->info.levels, desc, &md->size_metadata, md->metadata,
-                                   false);
+                                   device->instance->debug_flags & RADV_DEBUG_EXTRA_MD);
 }
 
 void

src/amd/vulkan/radv_instance.c

@@ -74,6 +74,7 @@ static const struct debug_control radv_debug_options[] = {
    {"epilogs", RADV_DEBUG_DUMP_EPILOGS},
    {"nofmask", RADV_DEBUG_NO_FMASK},
    {"shadowregs", RADV_DEBUG_SHADOW_REGS},
+   {"extra_md", RADV_DEBUG_EXTRA_MD},
    {NULL, 0}};
 
 const char *