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iommu/vt-d: Implement hw_info for iommu capability query

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Add intel_iommu_hw_info() to report cap_reg and ecap_reg information.

Link: https://lore.kernel.org/r/20230818101033.4100-6-yi.l.liu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu
2023-08-18 03:10:33 -07:00
committed by Jason Gunthorpe
parent af4fde93c3
commit 55243393b0
2 changed files with 42 additions and 0 deletions
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23
include/uapi/linux/iommufd.h
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@@ -372,13 +372,36 @@ struct iommu_hwpt_alloc {
};
#define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC)
/**
* struct iommu_hw_info_vtd - Intel VT-d hardware information
*
* @flags: Must be 0
* @__reserved: Must be 0
*
* @cap_reg: Value of Intel VT-d capability register defined in VT-d spec
* section 11.4.2 Capability Register.
* @ecap_reg: Value of Intel VT-d capability register defined in VT-d spec
* section 11.4.3 Extended Capability Register.
*
* User needs to understand the Intel VT-d specification to decode the
* register value.
*/
struct iommu_hw_info_vtd {
__u32 flags;
__u32 __reserved;
__aligned_u64 cap_reg;
__aligned_u64 ecap_reg;
};
/**
* enum iommu_hw_info_type - IOMMU Hardware Info Types
* @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware
* info
* @IOMMU_HW_INFO_TYPE_INTEL_VTD: Intel VT-d iommu info type
*/
enum iommu_hw_info_type {
IOMMU_HW_INFO_TYPE_NONE,
IOMMU_HW_INFO_TYPE_INTEL_VTD,
};
/**