Messages in this thread | | | Date | Wed, 22 Sep 2021 15:24:07 -0600 | From | Alex Williamson <> | Subject | Re: [RFC 10/20] iommu/iommufd: Add IOMMU_DEVICE_GET_INFO |
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On Sun, 19 Sep 2021 14:38:38 +0800 Liu Yi L <yi.l.liu@intel.com> wrote:
> +struct iommu_device_info { > + __u32 argsz; > + __u32 flags; > +#define IOMMU_DEVICE_INFO_ENFORCE_SNOOP (1 << 0) /* IOMMU enforced snoop */
Is this too PCI specific, or perhaps too much of the mechanism rather than the result? ie. should we just indicate if the IOMMU guarantees coherent DMA? Thanks,
Alex
> +#define IOMMU_DEVICE_INFO_PGSIZES (1 << 1) /* supported page sizes */ > +#define IOMMU_DEVICE_INFO_ADDR_WIDTH (1 << 2) /* addr_wdith field valid */ > + __u64 dev_cookie; > + __u64 pgsize_bitmap; > + __u32 addr_width; > +}; > + > +#define IOMMU_DEVICE_GET_INFO _IO(IOMMU_TYPE, IOMMU_BASE + 1) > > #define IOMMU_FAULT_PERM_READ (1 << 0) /* read */ > #define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */
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