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iommufd/viommu: Add iommufd_viommu_get_vdev_id helper

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This is a reverse search v.s. iommufd_viommu_find_dev, as drivers may want
to convert a struct device pointer (physical) to its virtual device ID for
an event injection to the user space VM.

Again, this avoids exposing more core structures to the drivers, than the
iommufd_viommu alone.

Link: https://patch.msgid.link/r/18b8e8bc1b8104d43b205d21602c036fd0804e56.1741719725.git.nicolinc@nvidia.com
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.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 2025-03-11 12:44:24 -07:00 committed by Jason Gunthorpe
parent e36ba5ab80
commit ea94b211c5
2 changed files with 33 additions and 0 deletions
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24
drivers/iommu/iommufd/driver.c
View File

@ -49,5 +49,29 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
}
EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, "IOMMUFD");
/* Return -ENOENT if device is not associated to the vIOMMU */
int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
struct device *dev, unsigned long *vdev_id)
{
struct iommufd_vdevice *vdev;
unsigned long index;
int rc = -ENOENT;
if (WARN_ON_ONCE(!vdev_id))
return -EINVAL;
xa_lock(&viommu->vdevs);
xa_for_each(&viommu->vdevs, index, vdev) {
if (vdev->dev == dev) {
*vdev_id = vdev->id;
rc = 0;
break;
}
}
xa_unlock(&viommu->vdevs);
return rc;
}
EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, "IOMMUFD");
MODULE_DESCRIPTION("iommufd code shared with builtin modules");
MODULE_LICENSE("GPL");

9
include/linux/iommufd.h
View File

@ -190,6 +190,8 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
enum iommufd_object_type type);
struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
unsigned long vdev_id);
int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
struct device *dev, unsigned long *vdev_id);
#else /* !CONFIG_IOMMUFD_DRIVER_CORE */
static inline struct iommufd_object *
_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@ -203,6 +205,13 @@ iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id)
{
return NULL;
}
static inline int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
struct device *dev,
unsigned long *vdev_id)
{
return -ENOENT;
}
#endif /* CONFIG_IOMMUFD_DRIVER_CORE */
/*