radeonsi: add basic memory object support

v2: also consider gfx9 metadata
v3: ref/unref memobj->buf
v4: add refcount comment

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h b/src/gallium/drivers/radeon/r600_pipe_common.h
index 9a73327..57730cd 100644 (file)
--- a/src/gallium/drivers/radeon/r600_pipe_common.h
+++ b/src/gallium/drivers/radeon/r600_pipe_common.h
@@ -378,6 +378,13 @@ union r600_mmio_counters {
        unsigned array[0];
 };
 
+struct r600_memory_object {
+       struct pipe_memory_object       b;
+       struct pb_buffer                *buf;
+       uint32_t                        stride;
+       uint32_t                        offset;
+};
+
 struct r600_common_screen {
        struct pipe_screen              b;
        struct radeon_winsys            *ws;

diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
index 84ba6ab..176896f 100644 (file)
--- a/src/gallium/drivers/radeon/r600_texture.c
+++ b/src/gallium/drivers/radeon/r600_texture.c
@@ -2864,10 +2864,125 @@ void evergreen_do_fast_color_clear(struct r600_common_context *rctx,
        }
 }
 
+static struct pipe_memory_object *
+r600_memobj_from_handle(struct pipe_screen *screen,
+                       struct winsys_handle *whandle,
+                       bool dedicated)
+{
+       struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
+       struct r600_memory_object *memobj = CALLOC_STRUCT(r600_memory_object);
+       struct pb_buffer *buf = NULL;
+       uint32_t stride, offset;
+
+       if (!memobj)
+               return NULL;
+
+       buf = rscreen->ws->buffer_from_handle(rscreen->ws, whandle,
+                                             &stride, &offset);
+       if (!buf) {
+               free(memobj);
+               return NULL;
+       }
+
+       memobj->b.dedicated = dedicated;
+       memobj->buf = buf;
+       memobj->stride = stride;
+       memobj->offset = offset;
+
+       return (struct pipe_memory_object *)memobj;
+
+}
+
+static void
+r600_memobj_destroy(struct pipe_screen *screen,
+                   struct pipe_memory_object *_memobj)
+{
+       struct r600_memory_object *memobj = (struct r600_memory_object *)_memobj;
+
+       pb_reference(&memobj->buf, NULL);
+       free(memobj);
+}
+
+static struct pipe_resource *
+r600_texture_from_memobj(struct pipe_screen *screen,
+                        const struct pipe_resource *templ,
+                        struct pipe_memory_object *_memobj,
+                        uint64_t offset)
+{
+       int r;
+       struct r600_common_screen *rscreen = (struct r600_common_screen*)screen;
+       struct r600_memory_object *memobj = (struct r600_memory_object *)_memobj;
+       struct r600_texture *rtex;
+       struct radeon_surf surface;
+       struct radeon_bo_metadata metadata = {};
+       enum radeon_surf_mode array_mode;
+       bool is_scanout;
+       struct pb_buffer *buf = NULL;
+
+       if (memobj->b.dedicated) {
+               rscreen->ws->buffer_get_metadata(memobj->buf, &metadata);
+               r600_surface_import_metadata(rscreen, &surface, &metadata,
+                                    &array_mode, &is_scanout);
+       } else {
+               /**
+                * The bo metadata is unset for un-dedicated images. So we fall
+                * back to linear. See answer to question 5 of the
+                * VK_KHX_external_memory spec for some details.
+                *
+                * It is possible that this case isn't going to work if the
+                * surface pitch isn't correctly aligned by default.
+                *
+                * In order to support it correctly we require multi-image
+                * metadata to be syncrhonized between radv and radeonsi. The
+                * semantics of associating multiple image metadata to a memory
+                * object on the vulkan export side are not concretely defined
+                * either.
+                *
+                * All the use cases we are aware of at the moment for memory
+                * objects use dedicated allocations. So lets keep the initial
+                * implementation simple.
+                *
+                * A possible alternative is to attempt to reconstruct the
+                * tiling information when the TexParameter TEXTURE_TILING_EXT
+                * is set.
+                */
+               array_mode = RADEON_SURF_MODE_LINEAR_ALIGNED;
+               is_scanout = false;
+
+       }
+
+       r = r600_init_surface(rscreen, &surface, templ,
+                             array_mode, memobj->stride,
+                             offset, true, is_scanout,
+                             false, false);
+       if (r)
+               return NULL;
+
+       rtex = r600_texture_create_object(screen, templ, memobj->buf, &surface);
+       if (!rtex)
+               return NULL;
+
+       /* r600_texture_create_object doesn't increment refcount of
+        * memobj->buf, so increment it here.
+        */
+       pb_reference(&buf, memobj->buf);
+
+       rtex->resource.b.is_shared = true;
+       rtex->resource.external_usage = PIPE_HANDLE_USAGE_READ_WRITE;
+
+       if (rscreen->apply_opaque_metadata)
+               rscreen->apply_opaque_metadata(rscreen, rtex, &metadata);
+
+       return &rtex->resource.b.b;
+}
+
 void r600_init_screen_texture_functions(struct r600_common_screen *rscreen)
 {
        rscreen->b.resource_from_handle = r600_texture_from_handle;
        rscreen->b.resource_get_handle = r600_texture_get_handle;
+       rscreen->b.resource_from_memobj = r600_texture_from_memobj;
+       rscreen->b.memobj_create_from_handle = r600_memobj_from_handle;
+       rscreen->b.memobj_destroy = r600_memobj_destroy;
 }
 
 void r600_init_context_texture_functions(struct r600_common_context *rctx)