From: Will Deacon Date: Wed, 21 Aug 2019 17:41:27 +0000 (+0100) Subject: Revert "iommu/arm-smmu-v3: Disable detection of ATS and PRI" X-Git-Tag: v5.4-rc1~13^2~11^4~1^2^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a91bcc2b65370e7debf1fc26b93a4c2a54433220;p=platform%2Fkernel%2Flinux-rpi.git 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 --- diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 0e43529..b8049ea 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;