[PATCH v5 02/27] iommu/arm-smmu-v3: Do not ATC invalidate the entire domain
Jason Gunthorpe
jgg at nvidia.com
Mon Mar 4 15:43:50 PST 2024
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 at nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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 d1bc151a5dff8c..9e9233331c4636 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2447,7 +2447,10 @@ 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);
}
--
2.43.2
More information about the linux-arm-kernel
mailing list