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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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19
drivers/iommu/intel/iommu.c
View file

@ -22,6 +22,7 @@
#include <linux/spinlock.h>
#include <linux/syscore_ops.h>
#include <linux/tboot.h>
#include <uapi/linux/iommufd.h>
#include "iommu.h"
#include "../dma-iommu.h"
@ -4732,8 +4733,26 @@ static void intel_iommu_remove_dev_pasid(struct device *dev, ioasid_t pasid)
intel_pasid_tear_down_entry(iommu, dev, pasid, false);
}
static void *intel_iommu_hw_info(struct device *dev, u32 *length, u32 *type)
{
struct device_domain_info *info = dev_iommu_priv_get(dev);
struct intel_iommu *iommu = info->iommu;
struct iommu_hw_info_vtd *vtd;
vtd = kzalloc(sizeof(*vtd), GFP_KERNEL);
if (!vtd)
return ERR_PTR(-ENOMEM);
vtd->cap_reg = iommu->cap;
vtd->ecap_reg = iommu->ecap;
*length = sizeof(*vtd);
*type = IOMMU_HW_INFO_TYPE_INTEL_VTD;
return vtd;
}
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.hw_info = intel_iommu_hw_info,
.domain_alloc = intel_iommu_domain_alloc,
.probe_device = intel_iommu_probe_device,
.probe_finalize = intel_iommu_probe_finalize,

23
include/uapi/linux/iommufd.h
View file

@ -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,
};
/**