virgl: add virgl_renderer_resource_import_blob

When a blob resource is created with
VIRGL_RENDERER_BLOB_FLAG_USE_CROSS_DEVICE, it can be exported to foreign
devices.

This provides the opposite direction.  When a foreign device allocates a
cross-device resource, virgl_renderer_resource_import_blob imports the
resource into virglrenderer.

This is similar to virgl_renderer_resource_import_eglimage, but is more
generic and is for blob resources.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Ryan Neph <ryanneph@google.com>

src/virglrenderer.c

@@ -1002,6 +1002,57 @@ virgl_renderer_resource_export_blob(uint32_t res_id, uint32_t *fd_type, int *fd)
    return 0;
 }
 
+int
+virgl_renderer_resource_import_blob(const struct virgl_renderer_resource_import_blob_args *args)
+{
+   TRACE_FUNC();
+   struct virgl_resource *res;
+
+   /* user resource id must be greater than 0 */
+   if (args->res_handle == 0)
+      return -EINVAL;
+
+   switch (args->blob_mem) {
+   case VIRGL_RENDERER_BLOB_MEM_HOST3D:
+      break;
+   default:
+      return -EINVAL;
+   }
+
+   enum virgl_resource_fd_type fd_type = VIRGL_RESOURCE_FD_INVALID;
+   switch (args->fd_type) {
+   case VIRGL_RENDERER_BLOB_FD_TYPE_DMABUF:
+      fd_type = VIRGL_RESOURCE_FD_DMABUF;
+      break;
+   case VIRGL_RENDERER_BLOB_FD_TYPE_OPAQUE:
+      fd_type = VIRGL_RESOURCE_FD_OPAQUE;
+      break;
+   case VIRGL_RENDERER_BLOB_FD_TYPE_SHM:
+      fd_type = VIRGL_RESOURCE_FD_SHM;
+      break;
+   default:
+      return -EINVAL;
+   }
+
+   if (args->fd < 0)
+      return -EINVAL;
+   if (args->size == 0)
+      return -EINVAL;
+
+   res = virgl_resource_create_from_fd(args->res_handle,
+                                       fd_type,
+                                       args->fd,
+                                       NULL,
+                                       0);
+   if (!res)
+      return -ENOMEM;
+
+   res->map_info = 0;
+   res->map_size = args->size;
+
+   return 0;
+}
+
 int
 virgl_renderer_export_fence(uint32_t client_fence_id, int *fd)
 {

src/virglrenderer.h

@@ -328,6 +328,18 @@ VIRGL_EXPORT int virgl_renderer_resource_get_map_info(uint32_t res_handle, uint3
 VIRGL_EXPORT int
 virgl_renderer_resource_export_blob(uint32_t res_id, uint32_t *fd_type, int *fd);
 
+struct virgl_renderer_resource_import_blob_args
+{
+   uint32_t res_handle;
+   uint32_t blob_mem;
+   uint32_t fd_type;
+   int fd;
+   uint64_t size;
+};
+
+VIRGL_EXPORT int
+virgl_renderer_resource_import_blob(const struct virgl_renderer_resource_import_blob_args *args);
+
 VIRGL_EXPORT int
 virgl_renderer_export_fence(uint32_t client_fence_id, int *fd);