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| author | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-29 23:29:37 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2022-12-01 03:16:49 +0300 |
| commit | 8d40205f6093f18e07fe3dc5920fc85e9f82b8b3 (patch) | |
| tree | d234a41f681336b827ac77cec59b838521832ad9 /drivers/iommu/iommufd/iommufd_private.h | |
| parent | e8d57210035b6377d424ba964961892d01127cf6 (diff) | |
| download | linux-8d40205f6093f18e07fe3dc5920fc85e9f82b8b3.tar.xz | |
iommufd: Add kAPI toward external drivers for kernel access
Kernel access is the mode that VFIO "mdevs" use. In this case there is no
struct device and no IOMMU connection. iommufd acts as a record keeper for
accesses and returns the actual struct pages back to the caller to use
however they need. eg with kmap or the DMA API.
Each caller must create a struct iommufd_access with
iommufd_access_create(), similar to how iommufd_device_bind() works. Using
this struct the caller can access blocks of IOVA using
iommufd_access_pin_pages() or iommufd_access_rw().
Callers must provide a callback that immediately unpins any IOVA being
used within a range. This happens if userspace unmaps the IOVA under the
pin.
The implementation forwards the access requests directly to the iopt
infrastructure that manages the iopt_pages_access.
Link: https://lore.kernel.org/r/14-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.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>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/iommu/iommufd/iommufd_private.h')
| -rw-r--r-- | drivers/iommu/iommufd/iommufd_private.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 72a0c805be23..40302cc0da36 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -65,6 +65,8 @@ int iopt_unmap_iova(struct io_pagetable *iopt, unsigned long iova, unsigned long length, unsigned long *unmapped); int iopt_unmap_all(struct io_pagetable *iopt, unsigned long *unmapped); +void iommufd_access_notify_unmap(struct io_pagetable *iopt, unsigned long iova, + unsigned long length); int iopt_table_add_domain(struct io_pagetable *iopt, struct iommu_domain *domain); void iopt_table_remove_domain(struct io_pagetable *iopt, @@ -106,6 +108,7 @@ enum iommufd_object_type { IOMMUFD_OBJ_DEVICE, IOMMUFD_OBJ_HW_PAGETABLE, IOMMUFD_OBJ_IOAS, + IOMMUFD_OBJ_ACCESS, }; /* Base struct for all objects with a userspace ID handle. */ @@ -246,6 +249,11 @@ void iommufd_hw_pagetable_destroy(struct iommufd_object *obj); void iommufd_device_destroy(struct iommufd_object *obj); struct iommufd_access { + struct iommufd_object obj; + struct iommufd_ctx *ictx; + struct iommufd_ioas *ioas; + const struct iommufd_access_ops *ops; + void *data; unsigned long iova_alignment; u32 iopt_access_list_id; }; @@ -253,4 +261,6 @@ struct iommufd_access { int iopt_add_access(struct io_pagetable *iopt, struct iommufd_access *access); void iopt_remove_access(struct io_pagetable *iopt, struct iommufd_access *access); +void iommufd_access_destroy_object(struct iommufd_object *obj); + #endif |