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iommufd: Add IOMMU_HWPT_SET_DIRTY_TRACKING

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Every IOMMU driver should be able to implement the needed iommu domain ops
to control dirty tracking.

Connect a hw_pagetable to the IOMMU core dirty tracking ops, specifically
the ability to enable/disable dirty tracking on an IOMMU domain
(hw_pagetable id). To that end add an io_pagetable kernel API to toggle
dirty tracking:

* iopt_set_dirty_tracking(iopt, [domain], state)

The intended caller of this is via the hw_pagetable object that is created.

Internally it will ensure the leftover dirty state is cleared /right
before/ dirty tracking starts. This is also useful for iommu drivers which
may decide that dirty tracking is always-enabled at boot without wanting to
toggle dynamically via corresponding iommu domain op.

Link: https://lore.kernel.org/r/20231024135109.73787-7-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Joao Martins
2023-10-24 14:50:57 +01:00
committed by Jason Gunthorpe
parent 5f9bdbf4c6
commit e2a4b29478
5 changed files with 121 additions and 0 deletions
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28
include/uapi/linux/iommufd.h
View File

@@ -47,6 +47,7 @@ enum {
IOMMUFD_CMD_VFIO_IOAS,
IOMMUFD_CMD_HWPT_ALLOC,
IOMMUFD_CMD_GET_HW_INFO,
IOMMUFD_CMD_HWPT_SET_DIRTY_TRACKING,
};
/**
@@ -453,4 +454,31 @@ struct iommu_hw_info {
__u32 __reserved;
};
#define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO)
/*
* enum iommufd_hwpt_set_dirty_tracking_flags - Flags for steering dirty
* tracking
* @IOMMU_HWPT_DIRTY_TRACKING_ENABLE: Enable dirty tracking
*/
enum iommufd_hwpt_set_dirty_tracking_flags {
IOMMU_HWPT_DIRTY_TRACKING_ENABLE = 1,
};
/**
* struct iommu_hwpt_set_dirty_tracking - ioctl(IOMMU_HWPT_SET_DIRTY_TRACKING)
* @size: sizeof(struct iommu_hwpt_set_dirty_tracking)
* @flags: Combination of enum iommufd_hwpt_set_dirty_tracking_flags
* @hwpt_id: HW pagetable ID that represents the IOMMU domain
* @__reserved: Must be 0
*
* Toggle dirty tracking on an HW pagetable.
*/
struct iommu_hwpt_set_dirty_tracking {
__u32 size;
__u32 flags;
__u32 hwpt_id;
__u32 __reserved;
};
#define IOMMU_HWPT_SET_DIRTY_TRACKING _IO(IOMMUFD_TYPE, \
IOMMUFD_CMD_HWPT_SET_DIRTY_TRACKING)
#endif