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iommufd: Add iommufd_access_replace() API

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Taking advantage of the new iommufd_access_change_ioas_id helper, add an
iommufd_access_replace() API for the VFIO emulated pathway to use.

Link: https://lore.kernel.org/r/a3267b924fd5f45e0d3a1dd13a9237e923563862.1690523699.git.nicolinc@nvidia.com
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2023-07-27 23:33:27 -07:00 committed by Jason Gunthorpe
parent 6129b59fcd
commit 70c16123d8
2 changed files with 16 additions and 0 deletions
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15
drivers/iommu/iommufd/device.c
View File

@ -849,6 +849,21 @@ int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id)
}
EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD);
int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id)
{
int rc;
mutex_lock(&access->ioas_lock);
if (!access->ioas) {
mutex_unlock(&access->ioas_lock);
return -ENOENT;
}
rc = iommufd_access_change_ioas_id(access, ioas_id);
mutex_unlock(&access->ioas_lock);
return rc;
}
EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD);
/**
* iommufd_access_notify_unmap - Notify users of an iopt to stop using it
* @iopt: iopt to work on

1
include/linux/iommufd.h
View File

@ -49,6 +49,7 @@ iommufd_access_create(struct iommufd_ctx *ictx,
const struct iommufd_access_ops *ops, void *data, u32 *id);
void iommufd_access_destroy(struct iommufd_access *access);
int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id);
int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id);
void iommufd_access_detach(struct iommufd_access *access);
void iommufd_ctx_get(struct iommufd_ctx *ictx);