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iommufd/viommu: Add iommufd_viommu_find_dev helper

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This avoids a bigger trouble of exposing struct iommufd_device and struct
iommufd_vdevice in the public header.

Link: https://patch.msgid.link/r/84fa7c624db4d4508067ccfdf42059533950180a.1730836308.git.nicolinc@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2024-11-05 12:05:14 -08:00 committed by Jason Gunthorpe
parent 4f2e59ccb6
commit c747e67978
2 changed files with 21 additions and 0 deletions
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13
drivers/iommu/iommufd/driver.c
View File

@ -36,5 +36,18 @@ out_free:
}
EXPORT_SYMBOL_NS_GPL(_iommufd_object_alloc, IOMMUFD);
/* Caller should xa_lock(&viommu->vdevs) to protect the return value */
struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
unsigned long vdev_id)
{
struct iommufd_vdevice *vdev;
lockdep_assert_held(&viommu->vdevs.xa_lock);
vdev = xa_load(&viommu->vdevs, vdev_id);
return vdev ? vdev->dev : NULL;
}
EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD);
MODULE_DESCRIPTION("iommufd code shared with builtin modules");
MODULE_LICENSE("GPL");

8
include/linux/iommufd.h
View File

@ -185,6 +185,8 @@ static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx)
struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
size_t size,
enum iommufd_object_type type);
struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
unsigned long vdev_id);
#else /* !CONFIG_IOMMUFD_DRIVER_CORE */
static inline struct iommufd_object *
_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@ -192,6 +194,12 @@ _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline struct device *
iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id)
{
return NULL;
}
#endif /* CONFIG_IOMMUFD_DRIVER_CORE */
/*