linux-kernel - [PATCH v2 5/7] iommufd/selftest: Add MOCK_FLAGS_DEVICE_NO

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Message-ID: <fe2398e920a8b85e7f695b25392c63210bdefa03.1760487869.git.nicolinc@nvidia.com>
Date: Tue, 14 Oct 2025 17:29:37 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>
CC: <robin.murphy@....com>, <joro@...tes.org>, <will@...nel.org>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>, <shuah@...nel.org>,
	<linux-kselftest@...r.kernel.org>, <shyamsaini@...ux.microsoft.com>
Subject: [PATCH v2 5/7] iommufd/selftest: Add MOCK_FLAGS_DEVICE_NO_ATTACH

Add a new MOCK_FLAGS_DEVICE_NO_ATTACH flag to allow the mock_domain cmd to
bypass the attach step, as IOMMU_OPTION_SW_MSI_START/SIZE only allow users
to set prior to an IOAS/HWPT attachment.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/iommufd/iommufd_test.h |  1 +
 drivers/iommu/iommufd/selftest.c     | 17 ++++++++++++-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 8fc618b2bcf96..7f7ffe5d670bb 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -54,6 +54,7 @@ enum {
 	MOCK_FLAGS_DEVICE_NO_DIRTY = 1 << 0,
 	MOCK_FLAGS_DEVICE_HUGE_IOVA = 1 << 1,
 	MOCK_FLAGS_DEVICE_PASID = 1 << 2,
+	MOCK_FLAGS_DEVICE_NO_ATTACH = 1 << 3,
 };
 
 enum {
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index de178827a078a..ee5671d7e55d8 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -1088,6 +1088,7 @@ static struct mock_dev *mock_dev_create(unsigned long dev_flags)
 		{},
 	};
 	const u32 valid_flags = MOCK_FLAGS_DEVICE_NO_DIRTY |
+				MOCK_FLAGS_DEVICE_NO_ATTACH |
 				MOCK_FLAGS_DEVICE_HUGE_IOVA |
 				MOCK_FLAGS_DEVICE_PASID;
 	struct mock_dev *mdev;
@@ -1181,9 +1182,13 @@ static int iommufd_test_mock_domain(struct iommufd_ucmd *ucmd,
 	}
 	sobj->idev.idev = idev;
 
-	rc = iommufd_device_attach(idev, IOMMU_NO_PASID, &pt_id);
-	if (rc)
-		goto out_unbind;
+	if (dev_flags & MOCK_FLAGS_DEVICE_NO_ATTACH) {
+		pt_id = 0;
+	} else {
+		rc = iommufd_device_attach(idev, IOMMU_NO_PASID, &pt_id);
+		if (rc)
+			goto out_unbind;
+	}
 
 	/* Userspace must destroy the device_id to destroy the object */
 	cmd->mock_domain.out_hwpt_id = pt_id;
@@ -1196,7 +1201,8 @@ static int iommufd_test_mock_domain(struct iommufd_ucmd *ucmd,
 	return 0;
 
 out_detach:
-	iommufd_device_detach(idev, IOMMU_NO_PASID);
+	if (!(dev_flags & MOCK_FLAGS_DEVICE_NO_ATTACH))
+		iommufd_device_detach(idev, IOMMU_NO_PASID);
 out_unbind:
 	iommufd_device_unbind(idev);
 out_mdev:
@@ -2024,7 +2030,8 @@ void iommufd_selftest_destroy(struct iommufd_object *obj)
 
 	switch (sobj->type) {
 	case TYPE_IDEV:
-		iommufd_device_detach(sobj->idev.idev, IOMMU_NO_PASID);
+		if (!(sobj->idev.mock_dev->flags & MOCK_FLAGS_DEVICE_NO_ATTACH))
+			iommufd_device_detach(sobj->idev.idev, IOMMU_NO_PASID);
 		iommufd_device_unbind(sobj->idev.idev);
 		mock_dev_destroy(sobj->idev.mock_dev);
 		break;
-- 
2.43.0