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Subject[PATCH 1/2] iommu/vt-d: report SVA feature with generic flag
Date
Query Shared Virtual Address/Memory capability is a generic feature. Report
Intel SVM as SVA feature such that generic code such as 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>
---
drivers/iommu/intel-iommu.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 92c2f2e4197b..5eca6e10d2a4 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -6346,9 +6346,14 @@ intel_iommu_dev_has_feat(struct device *dev, enum iommu_dev_features feat)
static int
intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
{
+ struct intel_iommu *intel_iommu = dev_to_intel_iommu(dev);
+
if (feat == IOMMU_DEV_FEAT_AUX)
return intel_iommu_enable_auxd(dev);

+ if (feat == IOMMU_DEV_FEAT_SVA)
+ return intel_iommu->flags & VTD_FLAG_SVM_CAPABLE;
+
return -ENODEV;
}

--
2.7.4
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