Commit a91bcc2b authored by Will Deacon's avatar Will Deacon
Browse files

Revert "iommu/arm-smmu-v3: Disable detection of ATS and PRI" 



This reverts commit b5e86196.

Now that ATC invalidation is performed in the correct places and without
incurring a locking overhead for non-ATS systems, we can re-enable the
corresponding SMMU feature detection.

Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent cdb8a3c3

drivers/iommu/arm-smmu-v3.c

+0 −2
Original line number Diff line number Diff line
@@ -3336,13 +3336,11 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) 
	}



	/* Boolean feature flags */

#if 0	/* ATS invalidation is slow and broken */

	if (IS_ENABLED(CONFIG_PCI_PRI) && reg & IDR0_PRI)

		smmu->features |= ARM_SMMU_FEAT_PRI;



	if (IS_ENABLED(CONFIG_PCI_ATS) && reg & IDR0_ATS)

		smmu->features |= ARM_SMMU_FEAT_ATS;

#endif



	if (reg & IDR0_SEV)

		smmu->features |= ARM_SMMU_FEAT_SEV;

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