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iommufd: Add IOMMU_HWPT_ALLOC

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This allows userspace to manually create HWPTs on IOAS's and then use
those HWPTs as inputs to iommufd_device_attach/replace().

Following series will extend this to allow creating iommu_domains with
driver specific parameters.

Link: https://lore.kernel.org/r/17-v8-6659224517ea+532-iommufd_alloc_jgg@nvidia.com
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe
2023-07-17 15:12:13 -03:00
parent fa1ffdb9e2
commit 7074d7bd67
4 changed files with 84 additions and 0 deletions
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26
include/uapi/linux/iommufd.h
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@@ -45,6 +45,7 @@ enum {
IOMMUFD_CMD_IOAS_UNMAP,
IOMMUFD_CMD_OPTION,
IOMMUFD_CMD_VFIO_IOAS,
IOMMUFD_CMD_HWPT_ALLOC,
};
/**
@@ -344,4 +345,29 @@ struct iommu_vfio_ioas {
__u16 __reserved;
};
#define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS)
/**
* struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC)
* @size: sizeof(struct iommu_hwpt_alloc)
* @flags: Must be 0
* @dev_id: The device to allocate this HWPT for
* @pt_id: The IOAS to connect this HWPT to
* @out_hwpt_id: The ID of the new HWPT
* @__reserved: Must be 0
*
* Explicitly allocate a hardware page table object. This is the same object
* type that is returned by iommufd_device_attach() and represents the
* underlying iommu driver's iommu_domain kernel object.
*
* A HWPT will be created with the IOVA mappings from the given IOAS.
*/
struct iommu_hwpt_alloc {
__u32 size;
__u32 flags;
__u32 dev_id;
__u32 pt_id;
__u32 out_hwpt_id;
__u32 __reserved;
};
#define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC)
#endif