evie/android_kernel_oneplus_msm8998
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iommu/arm-smmu: set a more appropriate DMA mask

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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.

Change-Id: Ia97122cef853cb48c9ad45a2a35717dd85cd9764
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>
[pdaly@codeaurora.org Take upstream version]
This commit is contained in:
Robin Murphy 2015-03-04 16:41:05 +00:00 • committed by David Keitel
parent ab1900e310
commit 922d32b8b4
1 changed files with 3 additions and 1 deletions
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4
drivers/iommu/arm-smmu.c
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@ -3241,7 +3241,9 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
* 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...
*/
dma_set_mask_and_coherent(smmu->dev, DMA_BIT_MASK(size));
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;