Commit 393a5778 authored by Yi Liu's avatar Yi Liu Committed by Jason Gunthorpe
Browse files

iommufd: Add data structure for Intel VT-d stage-1 cache invalidation 

This adds the data structure invalidating caches for the nested domain
allocated with IOMMU_HWPT_DATA_VTD_S1 type.

Link: https://lore.kernel.org/r/20240111041015.47920-8-yi.l.liu@intel.com


Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarYi Liu <yi.l.liu@intel.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent bf26eb83

include/uapi/linux/iommufd.h

+36 −0
Original line number Diff line number Diff line
@@ -623,6 +623,42 @@ enum iommu_hwpt_invalidate_data_type { 
	IOMMU_HWPT_INVALIDATE_DATA_VTD_S1,

};



/**

 * enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d

 *                                           stage-1 cache invalidation

 * @IOMMU_VTD_INV_FLAGS_LEAF: Indicates whether the invalidation applies

 *                            to all-levels page structure cache or just

 *                            the leaf PTE cache.

 */

enum iommu_hwpt_vtd_s1_invalidate_flags {

	IOMMU_VTD_INV_FLAGS_LEAF = 1 << 0,

};



/**

 * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation

 *                                       (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)

 * @addr: The start address of the range to be invalidated. It needs to

 *        be 4KB aligned.

 * @npages: Number of contiguous 4K pages to be invalidated.

 * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags

 * @__reserved: Must be 0

 *

 * The Intel VT-d specific invalidation data for user-managed stage-1 cache

 * invalidation in nested translation. Userspace uses this structure to

 * tell the impacted cache scope after modifying the stage-1 page table.

 *

 * Invalidating all the caches related to the page table by setting @addr

 * to be 0 and @npages to be U64_MAX.

 *

 * The device TLB will be invalidated automatically if ATS is enabled.

 */

struct iommu_hwpt_vtd_s1_invalidate {

	__aligned_u64 addr;

	__aligned_u64 npages;

	__u32 flags;

	__u32 __reserved;

};



/**

 * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE)

 * @size: sizeof(struct iommu_hwpt_invalidate)