linux-kernel - [PATCH v5 1/6] iommu/arm-smmu-v3: Simplify arm_smmu_enable

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Message-ID: <20230803181225.v5.1.I18d69f4908b8a9f801239117d2a6c3f5aa1e2e76@changeid>
Date:   Thu,  3 Aug 2023 18:12:21 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     baolu.lu@...ux.intel.com, will@...nel.org, jgg@...dia.com,
        jean-philippe@...aro.org, robin.murphy@....com,
        nicolinc@...dia.com, Michael Shavit <mshavit@...gle.com>
Subject: [PATCH v5 1/6] iommu/arm-smmu-v3: Simplify arm_smmu_enable_ats

arm_smmu_enable_ats's call to inv_domain would trigger an invalidation
for all masters that a domain is attached to everytime it's attached to
another ATS-enabled master. It doesn't seem like those invalidations are
necessary, and it's easier to reason about arm_smmu_enable_ats if it
only issues invalidation commands for the current master.

Signed-off-by: Michael Shavit <mshavit@...gle.com>
---

(no changes since v2)

Changes in v2:
- Fix commit message wrapping

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 +-
 1 file changed, 1 insertion(+), 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 61de66d17a5d5..4df335424b266 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2305,7 +2305,7 @@ 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, 0, 0, 0);
+	arm_smmu_atc_inv_master(master);
 	if (pci_enable_ats(pdev, stu))
 		dev_err(master->dev, "Failed to enable ATS (STU %zu)\n", stu);
 }
-- 
2.41.0.585.gd2178a4bd4-goog