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iommu: Add device-centric DMA ownership interfaces

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These complement the group interfaces used by VFIO and are for use by
iommufd. The main difference is that multiple devices in the same group
can all share the ownership by passing the same ownership pointer.

Move the common code into shared functions.

Link: https://lore.kernel.org/r/2-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Lu Baolu
2022-11-29 16:29:25 -04:00
committed by Jason Gunthorpe
parent 4989764d8e
commit 89395ccedb
2 changed files with 107 additions and 26 deletions
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12
include/linux/iommu.h
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@@ -707,6 +707,9 @@ int iommu_group_claim_dma_owner(struct iommu_group *group, void *owner);
void iommu_group_release_dma_owner(struct iommu_group *group);
bool iommu_group_dma_owner_claimed(struct iommu_group *group);
int iommu_device_claim_dma_owner(struct device *dev, void *owner);
void iommu_device_release_dma_owner(struct device *dev);
struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
struct mm_struct *mm);
int iommu_attach_device_pasid(struct iommu_domain *domain,
@@ -1064,6 +1067,15 @@ static inline bool iommu_group_dma_owner_claimed(struct iommu_group *group)
return false;
}
static inline void iommu_device_release_dma_owner(struct device *dev)
{
}
static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
{
return -ENODEV;
}
static inline struct iommu_domain *
iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
{