linux-kernel - [PATCH 1/2] iommu/vt-d: report SVA feature with generic flag

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Message-Id: <1582586797-61697-2-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Mon, 24 Feb 2020 15:26:35 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     "Yi Liu" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH 1/2] iommu/vt-d: report SVA feature with generic flag

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@...ux.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