[PATCH 6/6] etnaviv: upgrade DISCARD_RANGE to DISCARD_WHOLE_RESOURCE if possible

[Lucas Stach]

Hi Wladimir,

did you also review this patch? It's the last one of this series missing
review.

Regards,
Lucas

Am Freitag, den 19.05.2017, 11:41 +0200 schrieb Lucas Stach:
> Stolen from VC4. As we don't do any fancy reallocation tricks yet, it's
> possible to upgrade also coherent mappings and shared resources.
> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>  src/gallium/drivers/etnaviv/etnaviv_transfer.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/src/gallium/drivers/etnaviv/etnaviv_transfer.c b/src/gallium/drivers/etnaviv/etnaviv_transfer.c
> index 05cdbc599956..fe57aa4d17b2 100644
> --- a/src/gallium/drivers/etnaviv/etnaviv_transfer.c
> +++ b/src/gallium/drivers/etnaviv/etnaviv_transfer.c
> @@ -148,6 +148,20 @@ etna_transfer_map(struct pipe_context *pctx, struct pipe_resource *prsc,
>  
>     assert(level <= prsc->last_level);
>  
> +   /* Upgrade DISCARD_RANGE to WHOLE_RESOURCE if the whole resource is
> +    * being mapped. If we add buffer reallocation to avoid CPU/GPU sync this
> +    * check needs to be extended to coherent mappings and shared resources.
> +    */
> +   if ((usage & PIPE_TRANSFER_DISCARD_RANGE) &&
> +       !(usage & PIPE_TRANSFER_UNSYNCHRONIZED) &&
> +       prsc->last_level == 0 &&
> +       prsc->width0 == box->width &&
> +       prsc->height0 == box->height &&
> +       prsc->depth0 == box->depth &&
> +       prsc->array_size == 1) {
> +      usage |= PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;
> +   }
> +
>     if (rsc->texture && !etna_resource_newer(rsc, etna_resource(rsc->texture))) {
>        /* We have a texture resource which is the same age or newer than the
>         * render resource. Use the texture resource, which avoids bouncing