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iommu/vt-d: Report SVA feature with generic flag 

Query Shared Virtual Address/Memory capability is a generic feature.
SVA feature check is the required first step before calling
iommu_sva_bind_device().

VT-d checks SVA feature enabling at per IOMMU level during this step,
SVA bind device will check and enable PCI ATS, PRS, and PASID capabilities
at device level.

This patch reports Intel SVM as SVA feature such that generic code
(e.g. Uacce [1]) can use it.

[1] https://lkml.org/lkml/2020/1/15/604

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200516062101.29541-11-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan 2020-05-16 14:20:53 +08:00 committed by Joerg Roedel
parent e85bb99b79
commit 76fdd6c595
1 changed files with 18 additions and 0 deletions
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18
drivers/iommu/intel-iommu.c
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@ -5944,6 +5944,14 @@ intel_iommu_dev_has_feat(struct device *dev, enum iommu_dev_features feat)
return !!siov_find_pci_dvsec(to_pci_dev(dev));
}
if (feat == IOMMU_DEV_FEAT_SVA) {
struct device_domain_info *info = get_domain_info(dev);
return info && (info->iommu->flags & VTD_FLAG_SVM_CAPABLE) &&
info->pasid_supported && info->pri_supported &&
info->ats_supported;
}
return false;
}
@ -5953,6 +5961,16 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
if (feat == IOMMU_DEV_FEAT_AUX)
return intel_iommu_enable_auxd(dev);
if (feat == IOMMU_DEV_FEAT_SVA) {
struct device_domain_info *info = get_domain_info(dev);
if (!info)
return -EINVAL;
if (info->iommu->flags & VTD_FLAG_SVM_CAPABLE)
return 0;
}
return -ENODEV;
}