On Mon, Aug 11, 2014 at 9:51 PM, Hiroshi Doyu <hdoyu@xxxxxxxxxx> wrote:
> Hi Olav,
>
> Olav Haugan <ohaugan@xxxxxxxxxxxxxx> 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?
iirc, one plan for 'flags' was some sort of DONT_FLUSH_TLB flag for
drivers which wanted to map/unmap N buffers with a single flush at the
end. There might have been some other usages envisioned.
BR,
-R
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