linux-kernel - Re: [PATCH 0/5] iommu/vt-d: Consolidate various cache flush ops

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Message-ID: <20191202120252.45606c47@jacob-builder>
Date:   Mon, 2 Dec 2019 12:02:52 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>, ashok.raj@...el.com,
        kevin.tian@...el.com, Eric Auger <eric.auger@...hat.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH 0/5] iommu/vt-d: Consolidate various cache flush ops

On Fri, 22 Nov 2019 11:04:44 +0800
Lu Baolu <baolu.lu@...ux.intel.com> wrote:

> Intel VT-d 3.0 introduces more caches and interfaces for software to
> flush when it runs in the scalable mode. Currently various cache flush
> helpers are scattered around. This consolidates them by putting them
> in the existing iommu_flush structure.
> 
> /* struct iommu_flush - Intel IOMMU cache invalidation ops
>  *
>  * @cc_inv: invalidate context cache
>  * @iotlb_inv: Invalidate IOTLB and paging structure caches when
> software
>  *             has changed second-level tables.
>  * @p_iotlb_inv: Invalidate IOTLB and paging structure caches when
> software
>  *               has changed first-level tables.
>  * @pc_inv: invalidate pasid cache
>  * @dev_tlb_inv: invalidate cached mappings used by
> requests-without-PASID
>  *               from the Device-TLB on a endpoint device.
>  * @p_dev_tlb_inv: invalidate cached mappings used by
> requests-with-PASID
>  *                 from the Device-TLB on an endpoint device
>  */
> struct iommu_flush {
>         void (*cc_inv)(struct intel_iommu *iommu, u16 did,
>                        u16 sid, u8 fm, u64 type);
>         void (*iotlb_inv)(struct intel_iommu *iommu, u16 did, u64
> addr, unsigned int size_order, u64 type);
>         void (*p_iotlb_inv)(struct intel_iommu *iommu, u16 did, u32
> pasid, u64 addr, unsigned long npages, bool ih);
>         void (*pc_inv)(struct intel_iommu *iommu, u16 did, u32 pasid,
>                        u64 granu);
>         void (*dev_tlb_inv)(struct intel_iommu *iommu, u16 sid, u16
> pfsid, u16 qdep, u64 addr, unsigned int mask);
>         void (*p_dev_tlb_inv)(struct intel_iommu *iommu, u16 sid, u16
> pfsid, u32 pasid, u16 qdep, u64 addr,
>                               unsigned long npages);
> };
> 
> The name of each cache flush ops is defined according to the spec
> section 6.5 so that people are easy to look up them in the spec.
> 
Nice consolidation. For nested SVM, I also introduced cache flushed
helpers as needed.
https://lkml.org/lkml/2019/10/24/857

Should I wait for yours to be merged or you want to extend the this
consolidation after SVA/SVM cache flush? I expect to send my v8 shortly.

> Best regards,
> Lu Baolu
> 
> Lu Baolu (5):
>   iommu/vt-d: Extend iommu_flush for scalable mode
>   iommu/vt-d: Consolidate pasid cache invalidation
>   iommu/vt-d: Consolidate device tlb invalidation
>   iommu/vt-d: Consolidate pasid-based tlb invalidation
>   iommu/vt-d: Consolidate pasid-based device tlb invalidation
> 
>  drivers/iommu/dmar.c        |  61 ---------
>  drivers/iommu/intel-iommu.c | 246
> +++++++++++++++++++++++++++++------- drivers/iommu/intel-pasid.c |
> 39 +----- drivers/iommu/intel-svm.c   |  60 ++-------
>  include/linux/intel-iommu.h |  39 ++++--
>  5 files changed, 244 insertions(+), 201 deletions(-)
> 

[Jacob Pan]