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

This reverts commit b5e86196b8.

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 <will@kernel.org>
This commit is contained in:
Will Deacon 2019-08-21 18:41:27 +01:00
parent cdb8a3c346
commit a91bcc2b65
1 changed files with 0 additions and 2 deletions
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2
drivers/iommu/arm-smmu-v3.c
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@ -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;