From: Jason Gunthorpe Date: Wed, 27 Mar 2024 18:07:50 +0000 (-0300) Subject: iommu/arm-smmu-v3: Do not ATC invalidate the entire domain X-Git-Tag: v6.10-rc1~114^2^3~1^2~18 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=86e5ca098dd9f8c5b80a6205395aea0535018837;p=thirdparty%2Fkernel%2Flinux.git iommu/arm-smmu-v3: Do not ATC invalidate the entire domain At this point we know which master we are going to change the PCI config on, this is the only device we need to invalidate. Switch arm_smmu_atc_inv_domain() for arm_smmu_atc_inv_master(). Tested-by: Nicolin Chen Tested-by: Shameer Kolothum Reviewed-by: Michael Shavit Reviewed-by: Nicolin Chen Reviewed-by: Moritz Fischer Reviewed-by: Mostafa Saleh Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/4-v6-228e7adf25eb+4155-smmuv3_newapi_p2_jgg@nvidia.com Signed-off-by: Will Deacon --- diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 4eb74f0ad13b4..3aad4cb5c2631 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2410,7 +2410,10 @@ static void arm_smmu_enable_ats(struct arm_smmu_master *master, pdev = to_pci_dev(master->dev); atomic_inc(&smmu_domain->nr_ats_masters); - arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, 0, 0); + /* + * ATC invalidation of PASID 0 causes the entire ATC to be flushed. + */ + arm_smmu_atc_inv_master(master); if (pci_enable_ats(pdev, stu)) dev_err(master->dev, "Failed to enable ATS (STU %zu)\n", stu); }