[Mesa-dev] [PATCH 2/8] radeonsi: allow DMABUF exports for local buffers

[Nicolai Hähnle]

On 01.12.2017 21:19, Marek Olšák wrote:
> From: Marek Olšák <marek.olsak at amd.com>
> 
> Cc: 17.3 <mesa-stable at lists.freedesktop.org>

What's the use-case for this?

What if somebody exports as DMABUF, then re-imports in a different API 
and exports as FD for inter-process sharing from there?


> ---
>   src/gallium/drivers/radeon/r600_texture.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/src/gallium/drivers/radeon/r600_texture.c b/src/gallium/drivers/radeon/r600_texture.c
> index 2aa47b5..7a5d704 100644
> --- a/src/gallium/drivers/radeon/r600_texture.c
> +++ b/src/gallium/drivers/radeon/r600_texture.c
> @@ -740,21 +740,23 @@ static boolean r600_texture_get_handle(struct pipe_screen* screen,
>   				 rtex->surface.bpe;
>   			slice_size = rtex->surface.u.gfx9.surf_slice_size;
>   		} else {
>   			offset = rtex->surface.u.legacy.level[0].offset;
>   			stride = rtex->surface.u.legacy.level[0].nblk_x *
>   				 rtex->surface.bpe;
>   			slice_size = (uint64_t)rtex->surface.u.legacy.level[0].slice_size_dw * 4;
>   		}
>   	} else {
>   		/* Move a suballocated buffer into a non-suballocated allocation. */
> -		if (sscreen->ws->buffer_is_suballocated(res->buf)) {
> +		if (sscreen->ws->buffer_is_suballocated(res->buf) ||
> +		    (rtex->resource.flags & RADEON_FLAG_NO_INTERPROCESS_SHARING &&
> +		     whandle->type != DRM_API_HANDLE_TYPE_KMS)) {
>   			assert(!res->b.is_shared);
>   
>   			/* Allocate a new buffer with PIPE_BIND_SHARED. */
>   			struct pipe_resource templ = res->b.b;
>   			templ.bind |= PIPE_BIND_SHARED;
>   
>   			struct pipe_resource *newb =
>   				screen->resource_create(screen, &templ);
>   			if (!newb)
>   				return false;
> 


-- 
Lerne, wie die Welt wirklich ist,
Aber vergiss niemals, wie sie sein sollte.