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authorWill Deacon <will.deacon@arm.com>2018-10-01 12:42:49 +0100
committerWill Deacon <will.deacon@arm.com>2018-10-01 13:01:31 +0100
commit7d321bd3542500caf125249f44dc37cb4e738013 (patch)
treedbe77095cb6a0166aeb7ce0abe9a6f6c885695d7 /drivers/iommu
parent07fdef34d2be6811f00c6f9e4e2a1483cf86696c (diff)
downloadlinux-7d321bd3542500caf125249f44dc37cb4e738013.tar.bz2
iommu/arm-smmu: Ensure that page-table updates are visible before TLBI
The IO-pgtable code relies on the driver TLB invalidation callbacks to ensure that all page-table updates are visible to the IOMMU page-table walker. In the case that the page-table walker is cache-coherent, we cannot rely on an implicit DSB from the DMA-mapping code, so we must ensure that we execute a DSB in our tlb_add_flush() callback prior to triggering the invalidation. Cc: <stable@vger.kernel.org> Cc: Robin Murphy <robin.murphy@arm.com> Fixes: 2df7a25ce4a7 ("iommu/arm-smmu: Clean up DMA API usage") Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/arm-smmu.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index fd1b80ef9490..e7cbf4fcf61d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -469,6 +469,9 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
void __iomem *reg = ARM_SMMU_CB(smmu_domain->smmu, cfg->cbndx);
+ if (smmu_domain->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
+ wmb();
+
if (stage1) {
reg += leaf ? ARM_SMMU_CB_S1_TLBIVAL : ARM_SMMU_CB_S1_TLBIVA;
@@ -510,6 +513,9 @@ static void arm_smmu_tlb_inv_vmid_nosync(unsigned long iova, size_t size,
struct arm_smmu_domain *smmu_domain = cookie;
void __iomem *base = ARM_SMMU_GR0(smmu_domain->smmu);
+ if (smmu_domain->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
+ wmb();
+
writel_relaxed(smmu_domain->cfg.vmid, base + ARM_SMMU_GR0_TLBIVMID);
}