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Tue, 3 Mar 2026 12:13:20 -0800 From: Nicolin Chen To: , , CC: , , , , , , , , , Subject: [PATCH RFTv1 1/3] iommu/arm-smmu-v3: Drain in-flight fault handlers Date: Tue, 3 Mar 2026 12:13:05 -0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00020E62:EE_|DS5PPF7856D51FE:EE_ X-MS-Office365-Filtering-Correlation-Id: 45576ffe-04ba-4a6a-4576-08de79615e22 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: ZoLmfj/wrm4iKoEEXq5UM/Befu5SgQf/330FIpB34QqQSfiXcnVZZeKoGe+9SxN5+2xJ/YPkTj0lSajwYx3V20WZp5Q+a07ACmwIhOzKBKzwNhmixQ6qw6IRywU1Ainr4rD/aErnMoAY+e4+LsjZXbqPEE0B3bd2rmGKjg64U63Doo9evUz2KSrTnfz2isupEcw/otQQQV1oRg6r13Xs0WjtJb32PLyR/RTdN93laA6wNqP+yjPyQgIBURh59uE8LFbzuGeioKGEN/6Zxtjm7gUnOQQ2OM1HAm5jxjg5Mo79n0U3VZxVfToQHza0Rluk774ftyVbb1UlMYq6RZC/O2OjFOhbDTvZhLrevhF0S9klLo/ipg74j2uRhjksm83Z6QDGdhermjDCuFFvnxkYUXK/kuUfUxCnZtyiQP8iDLRsleT0CYbsTLFl03QeZ5Bl6Z+9f7en9C3l8+OgYPG+KHNv6Dw3ra9NOngihFDoQg9bTV6zilC6qDHXczIScHB+PLDGApsBHRzDDKq9Hbmlrs8/E+ZJe7y+PFFsQJFgOfFNq7JAQwx+8xQLjp1Krjj/lzZAFItQTME3mxVyik94VfNdCUgNnzuk7YlZfLS/7vBrNZOWRxVTd186xS9yQHodJ1BN6islDDzMCPNX6evpZXzlX6Ad4k/PeqNcgqccMLEGuuFxErlzDPSY0OAVhwfk4vIKZLX3iJg6F6meob2bgAHF9NU6JIaX6QuasvDKYCOYvK0U7zSxDsda4x+Aqym2lh1pQkia0+A/FnVaXot8zUP9VJz4gN563iEFgfe/BSwVTo6zXU37pEXDNugEpzAHTI8d9BDiipTrsNgRFTHEEw== X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(82310400026)(36860700013);DIR:OUT;SFP:1101; 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charset="utf-8" From: Malak Marrid When a device is switching away from a domain, either through a detach or a replace operation, it must drain its IOPF queue that only contains the page requests for the old domain. Co-developed-by: Barak Biber Signed-off-by: Barak Biber Co-developed-by: Stefan Kaestle Signed-off-by: Stefan Kaestle Signed-off-by: Malak Marrid Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/ar= m/arm-smmu-v3/arm-smmu-v3.c index 4d00d796f0783..2176ee8bec767 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2843,6 +2843,12 @@ static int arm_smmu_enable_iopf(struct arm_smmu_mast= er *master, if (master->iopf_refcount) { master->iopf_refcount++; master_domain->using_iopf =3D true; + /* + * If the device is already on the IOPF queue (domain replace), + * drain in-flight fault handlers so nothing will hold the old + * domain when the core switches the attach handle. + */ + iopf_queue_flush_dev(master->dev); return 0; } =20 @@ -2866,8 +2872,11 @@ static void arm_smmu_disable_iopf(struct arm_smmu_ma= ster *master, return; =20 master->iopf_refcount--; - if (master->iopf_refcount =3D=3D 0) + if (master->iopf_refcount =3D=3D 0) { + /* Drain in-flight fault handlers before removing device */ + iopf_queue_flush_dev(master->dev); iopf_queue_remove_device(master->smmu->evtq.iopf, master->dev); + } } =20 static void arm_smmu_remove_master_domain(struct arm_smmu_master *master, --=20 2.43.0