[PATCH vhost v2 19/19] virtio_net: sq support premapped mode

[Michael S. Tsirkin]

On Mon, Feb 26, 2024 at 07:33:29PM +0800, Xuan Zhuo wrote:
> > what is dma_map_direct? can't find it in the tree.
> 
> YES.
> 
> 
> diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
> index 58db8fd70471..5a8f7a927aa1 100644
> --- a/kernel/dma/mapping.c
> +++ b/kernel/dma/mapping.c
> @@ -144,6 +144,18 @@ static inline bool dma_map_direct(struct device *dev,
>         return dma_go_direct(dev, *dev->dma_mask, ops);
>  }
> 
> +bool dma_is_direct(struct device *dev)
> +{
> +       if (!dma_map_direct(dev, ops))
> +               return false;
> +
> +       if (is_swiotlb_force_bounce(dev))
> +               return false;
> +
> +       return true;
> +}
> +EXPORT_SYMBOL(dma_unmap_page_attrs);
> +
> 
> Thanks.


where is it? linux-next?

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MST