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Date: Fri, 31 Aug 2018 14:17:19 +0100 From: Jean-Philippe Brucker <jean-philippe.brucker@....com> To: Eric Auger <eric.auger@...hat.com>, "\"eric.auger.pro"@gmail.com, eric.auger@...hat.com, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu, joro@...tes.org, alex.williamson@...hat.com, jean-philippe.brucker@....com, jacob.jun.pan@...ux.intel.com, "yi.l.liu\""@linux.intel.com, will.deacon@....com, robin.murphy@....com Cc: marc.zyngier@....com, peter.maydell@...aro.org, christoffer.dall@....com Subject: Re: [RFC 02/13] iommu: Introduce tlb_invalidate API On 23/08/18 13:17, Eric Auger wrote: > +/** > + * Translation cache invalidation information, contains generic IOMMU > + * data which can be parsed based on model ID by model specific drivers. > + * Since the invalidation of second level page tables are included in the > + * unmap operation, this info is only applicable to the first level > + * translation caches, i.e. DMA request with PASID. > + * > + * @granularity: requested invalidation granularity, type dependent > + * @size: 2^size of 4K pages, 0 for 4k, 9 for 2MB, etc. > + * @nr_pages: number of pages to invalidate > + * @pasid: processor address space ID value per PCI spec. > + * @addr: page address to be invalidated > + * @flags IOMMU_INVALIDATE_ADDR_LEAF: leaf paging entries > + * IOMMU_INVALIDATE_GLOBAL_PAGE: global pages > + * > + */ > +struct iommu_tlb_invalidate_info { > + struct iommu_tlb_invalidate_hdr hdr; > + enum iommu_inv_granularity granularity; > + __u32 flags; > +#define IOMMU_INVALIDATE_ADDR_LEAF (1 << 0) > +#define IOMMU_INVALIDATE_GLOBAL_PAGE (1 << 1) > + __u8 size; > + __u64 nr_pages; > + __u32 pasid; > + __u64 addr; > +}; > #endif /* _UAPI_IOMMU_H */ Since the ioctl will be used to combine invalidations (invalidate both ATC and TLB with a single call), we need an additional ASID field for the SMMU - ATC is invalidated by PASID, TLB by ASID. I used to call it "tag", but I'm leaning towards "arch_id" now (http://www.linux-arm.org/git?p=linux-jpb.git;a=commitdiff;h=40fdef74816dd8d8d113100b9e0162fab4cec28d) Thanks, Jean
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