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 <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Moritz Fischer <moritzf@google.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/4-v6-228e7adf25eb+4155-smmuv3_newapi_p2_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

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 4eb74f0ad13b43c26f5fc1eddb94b82e33e86466..3aad4cb5c2631ed7a3616d8b7f91b534c95079e9 100644 (file)
--- 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);
 }