iommu/arm-smmu-v3: Rework enabling/disabling of ATS for PCI masters

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To prevent any potential issues arising from speculative Address
Translation Requests from an ATS-enabled PCIe endpoint, rework our ATS
enabling/disabling logic so that we enable ATS at the SMMU before we
enable it at the endpoint, and disable things in the opposite order.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Will Deacon 2019-08-20 14:28:59 +01:00

parent 7314ca8699

commit bfff88ec1a

1 changed files with 28 additions and 19 deletions

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drivers/iommu/arm-smmu-v3.c

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