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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2024-07-02 09:34:35 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-07-04 15:46:18 +0300 |
| commit | 14678219cf4093e897ab353fd78eab7994d1be7d (patch) | |
| tree | 606c28e3ebdd150803572d5b5aad0586a46e086b /include/linux/iommu.h | |
| parent | 83a7eefedc9b56fe7bfeff13b6c7356688ffa670 (diff) | |
| download | linux-14678219cf4093e897ab353fd78eab7994d1be7d.tar.xz | |
iommu: Introduce domain attachment handle
Currently, when attaching a domain to a device or its PASID, domain is
stored within the iommu group. It could be retrieved for use during the
window between attachment and detachment.
With new features introduced, there's a need to store more information
than just a domain pointer. This information essentially represents the
association between a domain and a device. For example, the SVA code
already has a custom struct iommu_sva which represents a bond between
sva domain and a PASID of a device. Looking forward, the IOMMUFD needs
a place to store the iommufd_device pointer in the core, so that the
device object ID could be quickly retrieved in the critical fault handling
path.
Introduce domain attachment handle that explicitly represents the
attachment relationship between a domain and a device or its PASID.
Co-developed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240702063444.105814-2-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 17b3f36ad843..afc5af0069bb 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -989,12 +989,22 @@ struct iommu_fwspec { /* ATS is supported */ #define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0) +/* + * An iommu attach handle represents a relationship between an iommu domain + * and a PASID or RID of a device. It is allocated and managed by the component + * that manages the domain and is stored in the iommu group during the time the + * domain is attached. + */ +struct iommu_attach_handle { + struct iommu_domain *domain; +}; + /** * struct iommu_sva - handle to a device-mm bond */ struct iommu_sva { + struct iommu_attach_handle handle; struct device *dev; - struct iommu_domain *domain; struct list_head handle_item; refcount_t users; }; @@ -1052,7 +1062,8 @@ int iommu_device_claim_dma_owner(struct device *dev, void *owner); void iommu_device_release_dma_owner(struct device *dev); int iommu_attach_device_pasid(struct iommu_domain *domain, - struct device *dev, ioasid_t pasid); + struct device *dev, ioasid_t pasid, + struct iommu_attach_handle *handle); void iommu_detach_device_pasid(struct iommu_domain *domain, struct device *dev, ioasid_t pasid); struct iommu_domain * @@ -1388,7 +1399,8 @@ static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner) } static inline int iommu_attach_device_pasid(struct iommu_domain *domain, - struct device *dev, ioasid_t pasid) + struct device *dev, ioasid_t pasid, + struct iommu_attach_handle *handle) { return -ENODEV; } |