Commit 86b0a96c authored by Yi Liu's avatar Yi Liu Committed by Alex Williamson
Browse files

iommufd: Add iommufd_ctx_has_group() 



This adds the helper to check if any device within the given iommu_group
has been bound with the iommufd_ctx. This is helpful for the checking on
device ownership for the devices which have not been bound but cannot be
bound to any other iommufd_ctx as the iommu_group has been bound.

Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Tested-by: default avatarYanting Jiang <yanting.jiang@intel.com>
Tested-by: default avatarTerrence Xu <terrence.xu@intel.com>
Tested-by: default avatarZhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: default avatarYi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718105542.4138-5-yi.l.liu@intel.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent eda175df

drivers/iommu/iommufd/device.c

+30 −0
Original line number Diff line number Diff line
@@ -98,6 +98,36 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, 
}

EXPORT_SYMBOL_NS_GPL(iommufd_device_bind, IOMMUFD);



/**

 * iommufd_ctx_has_group - True if any device within the group is bound

 *                         to the ictx

 * @ictx: iommufd file descriptor

 * @group: Pointer to a physical iommu_group struct

 *

 * True if any device within the group has been bound to this ictx, ex. via

 * iommufd_device_bind(), therefore implying ictx ownership of the group.

 */

bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group)

{

	struct iommufd_object *obj;

	unsigned long index;



	if (!ictx || !group)

		return false;



	xa_lock(&ictx->objects);

	xa_for_each(&ictx->objects, index, obj) {

		if (obj->type == IOMMUFD_OBJ_DEVICE &&

		    container_of(obj, struct iommufd_device, obj)->group == group) {

			xa_unlock(&ictx->objects);

			return true;

		}

	}

	xa_unlock(&ictx->objects);

	return false;

}

EXPORT_SYMBOL_NS_GPL(iommufd_ctx_has_group, IOMMUFD);



/**

 * iommufd_device_unbind - Undo iommufd_device_bind()

 * @idev: Device returned by iommufd_device_bind()

include/linux/iommufd.h

+2 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ struct page; 
struct iommufd_ctx;

struct iommufd_access;

struct file;

struct iommu_group;



struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,

					   struct device *dev, u32 *id);
@@ -50,6 +51,7 @@ void iommufd_ctx_get(struct iommufd_ctx *ictx); 
#if IS_ENABLED(CONFIG_IOMMUFD)

struct iommufd_ctx *iommufd_ctx_from_file(struct file *file);

void iommufd_ctx_put(struct iommufd_ctx *ictx);

bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group);



int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova,

			     unsigned long length, struct page **out_pages,