[PATCH 3/6] drm/tegra: Implement buffer object cache

[Mikko Perttunen]

On 9/16/21 12:44 PM, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
> ...
> diff --git a/drivers/gpu/drm/tegra/uapi.c b/drivers/gpu/drm/tegra/uapi.c
> index 794c400c38b1..66fe8717e747 100644
> --- a/drivers/gpu/drm/tegra/uapi.c
> +++ b/drivers/gpu/drm/tegra/uapi.c
> @@ -201,7 +201,8 @@ int tegra_drm_ioctl_channel_map(struct drm_device *drm, void *data, struct drm_f
>   		goto put_gem;
>   	}
>   
> -	mapping->map = host1x_bo_pin(context->client->base.dev, mapping->bo, direction);
> +	mapping->map = host1x_bo_pin(context->client->base.dev, mapping->bo, direction,
> +				     &context->client->base.cache);

Do we need caching here? The map/unmap operation is explicit and should 
not be on the hot path, and this will complicate context isolation 
support where we cannot have an engine-specific cache.

Mikko