Re: [PATCH v5 1/1] iommu-api: Add map_sg/unmap_sg functions

[Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Hi Olav,

Olav Haugan <ohaugan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> writes:

> @@ -93,6 +94,10 @@ enum iommu_attr {
>   * @detach_dev: detach device from an iommu domain
>   * @map: map a physically contiguous memory region to an iommu domain
>   * @unmap: unmap a physically contiguous memory region from an iommu domain
> + * @map_sg: map a scatter-gather list of physically contiguous memory chunks
> + * to an iommu domain
> + * @unmap_sg: unmap a scatter-gather list of physically contiguous memory
> + * chunks from an iommu domain
>   * @iova_to_phys: translate iova to physical address
>   * @domain_has_cap: domain capabilities query
>   * @add_device: add device to iommu grouping
> @@ -110,6 +115,11 @@ struct iommu_ops {
>                    phys_addr_t paddr, size_t size, int prot);
>         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
>                      size_t size);
> +       int (*map_sg)(struct iommu_domain *domain, unsigned long iova,
> +                       struct scatterlist *sg, unsigned int nents, int prot,
> +                       unsigned long flags);
> +       int (*unmap_sg)(struct iommu_domain *domain, unsigned long iova,
> +                       size_t size, unsigned long flags);

Do you have any exmaple/explanation for the above "flags"?

Is this going to be used for iommu global/standard attribute or SoC
spcific one?