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[v4,05/23] iommufd/driver: Let iommufd_viommu_alloc helper save ictx to viommu->ictx

Message ID 5288cec9804e7e394be3b7de6b246d8ca9c4792a.1746757630.git.nicolinc@nvidia.com
State New
Headers show
Series iommufd: Add vIOMMU infrastructure (Part-4 HW QUEUE) | expand

Commit Message

Nicolin Chen May 9, 2025, 3:02 a.m. UTC 
When an IOMMU driver calls iommufd_viommu_alloc(), it must pass in an ictx
pointer as the underlying _iommufd_object_alloc() helper function requires
that to allocate a new object. However, neither the iommufd_viommu_alloc()
nor its underlying _iommufd_object_alloc() saves the ictx in the allocated
viommu object, although viommu could hold an ictx pointer.

When the IOMMU driver wants to use another iommufd function passing in the
allocated viommu, it could have avoided passing in the ictx pointer again,
if viommu->ictx is valid.

Save ictx to viommu->ictx in the iommufd_viommu_alloc(), in order to ease
a new vIOMMU-based helper that would then get the ictx from viommu->ictx.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 include/linux/iommufd.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 422eda95d19e..dc6535e848df 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -262,8 +262,10 @@  static inline int iommufd_viommu_report_event(struct iommufd_viommu *viommu,
 		static_assert(offsetof(drv_struct, member.obj) == 0);          \
 		ret = (drv_struct *)_iommufd_object_alloc(                     \
 			ictx, sizeof(drv_struct), IOMMUFD_OBJ_VIOMMU);         \
-		if (!IS_ERR(ret))                                              \
+		if (!IS_ERR(ret)) {                                            \
 			ret->member.ops = viommu_ops;                          \
+			ret->member.ictx = ictx;                               \
+		}                                                              \
 		ret;                                                           \
 	})