Re: [PATCH v9 2/5] iommu/dma: Add a new dma_map_ops of get_merge_boundary()

[Wolfram Sang]

On Fri, Jul 26, 2019 at 05:31:13PM +0900, Yoshihiro Shimoda wrote:
> This patch adds a new dma_map_ops of get_merge_boundary() to
> expose the DMA merge boundary if the domain type is IOMMU_DOMAIN_DMA.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
> Reviewed-by: Simon Horman <horms+rene...@verge.net.au>

Joerg, can we have your ack for this patch so Christoph can take this
series via his tree?

Thanks,

   Wolfram

> ---
>  drivers/iommu/dma-iommu.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index a7f9c3e..2992ce4 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -1085,6 +1085,16 @@ static int iommu_dma_get_sgtable(struct device *dev, 
> struct sg_table *sgt,
>       return ret;
>  }
>  
> +static unsigned long iommu_dma_get_merge_boundary(struct device *dev)
> +{
> +     struct iommu_domain *domain = iommu_get_dma_domain(dev);
> +
> +     if (domain->type != IOMMU_DOMAIN_DMA)
> +             return 0;       /* can't merge */
> +
> +     return (1UL << __ffs(domain->pgsize_bitmap)) - 1;
> +}
> +
>  static const struct dma_map_ops iommu_dma_ops = {
>       .alloc                  = iommu_dma_alloc,
>       .free                   = iommu_dma_free,
> @@ -1100,6 +1110,7 @@ static const struct dma_map_ops iommu_dma_ops = {
>       .sync_sg_for_device     = iommu_dma_sync_sg_for_device,
>       .map_resource           = iommu_dma_map_resource,
>       .unmap_resource         = iommu_dma_unmap_resource,
> +     .get_merge_boundary     = iommu_dma_get_merge_boundary,
>  };
>  
>  /*
> -- 
> 2.7.4
> 

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