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iommufd: Add capabilities to IOMMU_GET_HW_INFO

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Extend IOMMUFD_CMD_GET_HW_INFO op to query generic iommu capabilities for a
given device.

Capabilities are IOMMU agnostic and use device_iommu_capable() API passing
one of the IOMMU_CAP_*. Enumerate IOMMU_CAP_DIRTY_TRACKING for now in the
out_capabilities field returned back to userspace.

Link: https://lore.kernel.org/r/20231024135109.73787-9-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 14:50:59 +01:00 committed by Jason Gunthorpe
parent b9a60d6f85
commit 7623683857
2 changed files with 21 additions and 0 deletions
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4
drivers/iommu/iommufd/device.c
View File

@ -1185,6 +1185,10 @@ int iommufd_get_hw_info(struct iommufd_ucmd *ucmd)
*/
cmd->data_len = data_len;
cmd->out_capabilities = 0;
if (device_iommu_capable(idev->dev, IOMMU_CAP_DIRTY_TRACKING))
cmd->out_capabilities |= IOMMU_HW_CAP_DIRTY_TRACKING;
rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
out_free:
kfree(data);

17
include/uapi/linux/iommufd.h
View File

@ -418,6 +418,20 @@ enum iommu_hw_info_type {
IOMMU_HW_INFO_TYPE_INTEL_VTD,
};
/**
* enum iommufd_hw_capabilities
* @IOMMU_HW_CAP_DIRTY_TRACKING: IOMMU hardware support for dirty tracking
* If available, it means the following APIs
* are supported:
*
* IOMMU_HWPT_GET_DIRTY_BITMAP
* IOMMU_HWPT_SET_DIRTY_TRACKING
*
*/
enum iommufd_hw_capabilities {
IOMMU_HW_CAP_DIRTY_TRACKING = 1 << 0,
};
/**
* struct iommu_hw_info - ioctl(IOMMU_GET_HW_INFO)
* @size: sizeof(struct iommu_hw_info)
@ -429,6 +443,8 @@ enum iommu_hw_info_type {
* the iommu type specific hardware information data
* @out_data_type: Output the iommu hardware info type as defined in the enum
* iommu_hw_info_type.
* @out_capabilities: Output the generic iommu capability info type as defined
* in the enum iommu_hw_capabilities.
* @__reserved: Must be 0
*
* Query an iommu type specific hardware information data from an iommu behind
@ -453,6 +469,7 @@ struct iommu_hw_info {
__aligned_u64 data_uptr;
__u32 out_data_type;
__u32 __reserved;
__aligned_u64 out_capabilities;
};
#define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO)