linux-kernel - [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc

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Date:   Wed,  8 Feb 2023 20:31:42 -0800
From:   Yi Liu <yi.l.liu@...el.com>
To:     joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
        kevin.tian@...el.com, robin.murphy@....com
Cc:     cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
        kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        baolu.lu@...ux.intel.com
Subject: [PATCH 06/17] iommufd/hw_pagetable: Use domain_alloc_user op for domain allocation

This converts iommufd to use iommu_domain_alloc_user() for iommu_domain
creation.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
---
 drivers/iommu/iommufd/hw_pagetable.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index 43d473989a06..08d963ee38c7 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -30,6 +30,7 @@ struct iommufd_hw_pagetable *
 iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 			   struct device *dev)
 {
+	const struct iommu_ops *ops;
 	struct iommufd_hw_pagetable *hwpt;
 	int rc;
 
@@ -37,7 +38,13 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 	if (IS_ERR(hwpt))
 		return hwpt;
 
-	hwpt->domain = iommu_domain_alloc(dev->bus);
+	ops = dev_iommu_ops(dev);
+	if (!ops || !ops->domain_alloc_user) {
+		rc = -EOPNOTSUPP;
+		goto out_abort;
+	}
+
+	hwpt->domain = ops->domain_alloc_user(dev, NULL, NULL);
 	if (!hwpt->domain) {
 		rc = -ENOMEM;
 		goto out_abort;
-- 
2.34.1