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| author | Will Deacon <will.deacon@arm.com> | 2018-10-01 13:42:49 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-10-01 14:01:31 +0200 |
| commit | 7d321bd3542500caf125249f44dc37cb4e738013 (patch) | |
| tree | dbe77095cb6a0166aeb7ce0abe9a6f6c885695d7 /drivers/iommu | |
| parent | iommu/arm-smmu-v3: Implement flush_iotlb_all hook (diff) | |
| download | linux-7d321bd3542500caf125249f44dc37cb4e738013.tar.xz linux-7d321bd3542500caf125249f44dc37cb4e738013.zip | |
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.c | 6 |
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); } |