From a91bcc2b65370e7debf1fc26b93a4c2a54433220 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 21 Aug 2019 18:41:27 +0100 Subject: Revert "iommu/arm-smmu-v3: Disable detection of ATS and PRI" This reverts commit b5e86196b83fd68e065a7c811ab8925fb0dc3893. 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: Will Deacon --- drivers/iommu/arm-smmu-v3.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers/iommu/arm-smmu-v3.c') diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 0e43529d55fe..b8049ea2e455 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -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; -- cgit v1.2.3