Commit 70c16123 authored by Nicolin Chen's avatar Nicolin Chen Committed by Jason Gunthorpe
Browse files

iommufd: Add iommufd_access_replace() API 

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: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarNicolin Chen <nicolinc@nvidia.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent 6129b59f

drivers/iommu/iommufd/device.c

+15 −0
Original line number Diff line number Diff line
@@ -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

include/linux/iommufd.h

+1 −0
Original line number Diff line number Diff line
@@ -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);