Commit 76fdd6c5 authored May 16, 2020 by Jacob Pan Committed by Joerg Roedel May 18, 2020

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>

parent e85bb99b

drivers/iommu/intel-iommu.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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