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    Subject[PATCH 5.10 394/530] iommu/vt-d: Invalidate PASID cache when root/context entry changed
    Date
    From: Lu Baolu <baolu.lu@linux.intel.com>

    [ Upstream commit c0474a606ecb9326227b4d68059942f9db88a897 ]

    When the Intel IOMMU is operating in the scalable mode, some information
    from the root and context table may be used to tag entries in the PASID
    cache. Software should invalidate the PASID-cache when changing root or
    context table entries.

    Suggested-by: Ashok Raj <ashok.raj@intel.com>
    Fixes: 7373a8cc38197 ("iommu/vt-d: Setup context and enable RID2PASID support")
    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    Link: https://lore.kernel.org/r/20210320025415.641201-4-baolu.lu@linux.intel.com
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/iommu/intel/iommu.c | 18 +++++++++---------
    include/linux/intel-iommu.h | 1 +
    2 files changed, 10 insertions(+), 9 deletions(-)

    diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
    index 30c2b52f7ea2..db9bf5ac0722 100644
    --- a/drivers/iommu/intel/iommu.c
    +++ b/drivers/iommu/intel/iommu.c
    @@ -1348,6 +1348,11 @@ static void iommu_set_root_entry(struct intel_iommu *iommu)
    readl, (sts & DMA_GSTS_RTPS), sts);

    raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
    +
    + iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
    + if (sm_supported(iommu))
    + qi_flush_pasid_cache(iommu, 0, QI_PC_GLOBAL, 0);
    + iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
    }

    void iommu_flush_write_buffer(struct intel_iommu *iommu)
    @@ -2521,6 +2526,10 @@ static void domain_context_clear_one(struct intel_iommu *iommu, u8 bus, u8 devfn
    (((u16)bus) << 8) | devfn,
    DMA_CCMD_MASK_NOBIT,
    DMA_CCMD_DEVICE_INVL);
    +
    + if (sm_supported(iommu))
    + qi_flush_pasid_cache(iommu, did_old, QI_PC_ALL_PASIDS, 0);
    +
    iommu->flush.flush_iotlb(iommu,
    did_old,
    0,
    @@ -3387,8 +3396,6 @@ static int __init init_dmars(void)
    register_pasid_allocator(iommu);
    #endif
    iommu_set_root_entry(iommu);
    - iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
    - iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
    }

    #ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
    @@ -4166,12 +4173,7 @@ static int init_iommu_hw(void)
    }

    iommu_flush_write_buffer(iommu);
    -
    iommu_set_root_entry(iommu);
    -
    - iommu->flush.flush_context(iommu, 0, 0, 0,
    - DMA_CCMD_GLOBAL_INVL);
    - iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
    iommu_enable_translation(iommu);
    iommu_disable_protect_mem_regions(iommu);
    }
    @@ -4499,8 +4501,6 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
    goto disable_iommu;

    iommu_set_root_entry(iommu);
    - iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
    - iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
    iommu_enable_translation(iommu);

    iommu_disable_protect_mem_regions(iommu);
    diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
    index ccaa057faf8c..c00ee3458a91 100644
    --- a/include/linux/intel-iommu.h
    +++ b/include/linux/intel-iommu.h
    @@ -369,6 +369,7 @@ enum {
    /* PASID cache invalidation granu */
    #define QI_PC_ALL_PASIDS 0
    #define QI_PC_PASID_SEL 1
    +#define QI_PC_GLOBAL 3

    #define QI_EIOTLB_ADDR(addr) ((u64)(addr) & VTD_PAGE_MASK)
    #define QI_EIOTLB_IH(ih) (((u64)ih) << 6)
    --
    2.30.2


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