system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-10-07 11:53:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

iommufd: Add iommufd_ctx_has_group()

Browse source 
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: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718105542.4138-5-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yi Liu 2023-07-18 03:55:36 -07:00 committed by Alex Williamson
parent eda175dfe2
commit 86b0a96c29
2 changed files with 32 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
drivers/iommu/iommufd/device.c
View file

@ -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()

2
include/linux/iommufd.h
View file

@ -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,