linux-kernel - [PATCH v1 12/12] iommufd: Apply the new iommufd_object_alloc

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Message-ID: <1dc6db3fb727f33818d37c6e46bcf3a7ff4d4ce2.1749488870.git.nicolinc@nvidia.com>
Date: Mon, 9 Jun 2025 10:13:35 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<ddutile@...hat.com>, <yi.l.liu@...el.com>, <peterz@...radead.org>,
	<jsnitsel@...hat.com>, <praan@...gle.com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <patches@...ts.linux.dev>,
	<baolu.lu@...ux.intel.com>
Subject: [PATCH v1 12/12] iommufd: Apply the new iommufd_object_alloc_ucmd helper

Now the new ucmd-based object allocator eases the finalize/abort routine,
apply this to all existing allocators that aren't protected by any lock.

Upgrade the for-driver vIOMMU alloctor too, and pass down to all existing
viommu_alloc op accordingly.

Note that __iommufd_object_alloc_ucmd() builds in some static tests that
cover both static_asserts in the iommufd_viommu_alloc(). Thus drop them.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/iommufd/eventq.c | 14 ++++----------
 drivers/iommu/iommufd/viommu.c | 24 ++++++------------------
 2 files changed, 10 insertions(+), 28 deletions(-)

diff --git a/drivers/iommu/iommufd/eventq.c b/drivers/iommu/iommufd/eventq.c
index e373b9eec7f5..fc4de63b0bce 100644
--- a/drivers/iommu/iommufd/eventq.c
+++ b/drivers/iommu/iommufd/eventq.c
@@ -427,8 +427,8 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd)
 	if (cmd->flags)
 		return -EOPNOTSUPP;
 
-	fault = __iommufd_object_alloc(ucmd->ictx, fault, IOMMUFD_OBJ_FAULT,
-				       common.obj);
+	fault = __iommufd_object_alloc_ucmd(ucmd, fault, IOMMUFD_OBJ_FAULT,
+					    common.obj);
 	if (IS_ERR(fault))
 		return PTR_ERR(fault);
 
@@ -437,10 +437,8 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd)
 
 	fdno = iommufd_eventq_init(&fault->common, "[iommufd-pgfault]",
 				   ucmd->ictx, &iommufd_fault_fops);
-	if (fdno < 0) {
-		rc = fdno;
-		goto out_abort;
-	}
+	if (fdno < 0)
+		return fdno;
 
 	cmd->out_fault_id = fault->common.obj.id;
 	cmd->out_fault_fd = fdno;
@@ -448,7 +446,6 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd)
 	rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
 	if (rc)
 		goto out_put_fdno;
-	iommufd_object_finalize(ucmd->ictx, &fault->common.obj);
 
 	fd_install(fdno, fault->common.filep);
 
@@ -456,9 +453,6 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd)
 out_put_fdno:
 	put_unused_fd(fdno);
 	fput(fault->common.filep);
-out_abort:
-	iommufd_object_abort_and_destroy(ucmd->ictx, &fault->common.obj);
-
 	return rc;
 }
 
diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c
index 63a92fb27ef4..742df3cb0ba5 100644
--- a/drivers/iommu/iommufd/viommu.c
+++ b/drivers/iommu/iommufd/viommu.c
@@ -61,8 +61,8 @@ int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd)
 		goto out_put_hwpt;
 	}
 
-	viommu = (struct iommufd_viommu *)_iommufd_object_alloc(
-		ucmd->ictx, viommu_size, IOMMUFD_OBJ_VIOMMU);
+	viommu = (struct iommufd_viommu *)_iommufd_object_alloc_ucmd(
+		ucmd, viommu_size, IOMMUFD_OBJ_VIOMMU);
 	if (IS_ERR(viommu)) {
 		rc = PTR_ERR(viommu);
 		goto out_put_hwpt;
@@ -84,23 +84,17 @@ int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd)
 
 	rc = ops->viommu_init(viommu, hwpt_paging->common.domain);
 	if (rc)
-		goto out_abort;
+		goto out_put_hwpt;
 
 	/* It is a driver bug that viommu->ops isn't filled */
 	if (WARN_ON_ONCE(!viommu->ops)) {
 		rc = -EINVAL;
-		goto out_abort;
+		goto out_put_hwpt;
 	}
 
 	cmd->out_viommu_id = viommu->obj.id;
 	rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
-	if (rc)
-		goto out_abort;
-	iommufd_object_finalize(ucmd->ictx, &viommu->obj);
-	goto out_put_hwpt;
 
-out_abort:
-	iommufd_object_abort_and_destroy(ucmd->ictx, &viommu->obj);
 out_put_hwpt:
 	iommufd_put_object(ucmd->ictx, &hwpt_paging->common.obj);
 out_put_idev:
@@ -148,7 +142,7 @@ int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd)
 		goto out_put_idev;
 	}
 
-	vdev = iommufd_object_alloc(ucmd->ictx, vdev, IOMMUFD_OBJ_VDEVICE);
+	vdev = iommufd_object_alloc_ucmd(ucmd, vdev, IOMMUFD_OBJ_VDEVICE);
 	if (IS_ERR(vdev)) {
 		rc = PTR_ERR(vdev);
 		goto out_put_idev;
@@ -163,18 +157,12 @@ int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd)
 	curr = xa_cmpxchg(&viommu->vdevs, virt_id, NULL, vdev, GFP_KERNEL);
 	if (curr) {
 		rc = xa_err(curr) ?: -EEXIST;
-		goto out_abort;
+		goto out_put_idev;
 	}
 
 	cmd->out_vdevice_id = vdev->obj.id;
 	rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
-	if (rc)
-		goto out_abort;
-	iommufd_object_finalize(ucmd->ictx, &vdev->obj);
-	goto out_put_idev;
 
-out_abort:
-	iommufd_object_abort_and_destroy(ucmd->ictx, &vdev->obj);
 out_put_idev:
 	iommufd_put_object(ucmd->ictx, &idev->obj);
 out_put_viommu:
-- 
2.43.0