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| author | Robin Murphy <Robin.Murphy@arm.com> | 2015-03-04 16:41:05 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-03-27 13:39:36 +0000 |
| commit | f1d84548694fe45f3348c0379d7277fed05bbcf0 (patch) | |
| tree | 0868f35f00e9d905b8d14f0804587d8d538dd197 /drivers/iommu/arm-smmu.c | |
| parent | 4a1c93cbe9b2cf559fee3316ee287bb042eb1aba (diff) | |
| download | lwn-f1d84548694fe45f3348c0379d7277fed05bbcf0.tar.gz lwn-f1d84548694fe45f3348c0379d7277fed05bbcf0.zip | |
iommu/arm-smmu: set a more appropriate DMA mask
Since we use dma_map_page() as an architecture-independent means of
making page table updates visible to non-coherent SMMUs, we need to
have a suitable DMA mask set to discourage the DMA mapping layer from
creating bounce buffers and flushing those instead, if said page tables
happen to lie outside the default 32-bit mask.
Tested-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: added error checking]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu/arm-smmu.c')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 4abb831e24f0..161dd46999e2 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1634,6 +1634,15 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu) size = arm_smmu_id_size_to_bits((id >> ID2_OAS_SHIFT) & ID2_OAS_MASK); smmu->pa_size = size; + /* + * What the page table walker can address actually depends on which + * descriptor format is in use, but since a) we don't know that yet, + * and b) it can vary per context bank, this will have to do... + */ + if (dma_set_mask_and_coherent(smmu->dev, DMA_BIT_MASK(size))) + dev_warn(smmu->dev, + "failed to set DMA mask for table walker\n"); + if (smmu->version == ARM_SMMU_V1) { smmu->va_size = smmu->ipa_size; size = SZ_4K | SZ_2M | SZ_1G; |