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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org, Tom Murphy <murphyt7@tcd.ie>
Subject: [PATCH 10/18] iommu/vt-d: Report SVA feature with generic flag
Date: Sat, 16 May 2020 14:20:53 +0800	[thread overview]
Message-ID: <20200516062101.29541-11-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20200516062101.29541-1-baolu.lu@linux.intel.com>

From: Jacob Pan <jacob.jun.pan@linux.intel.com>

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>
---
 drivers/iommu/intel-iommu.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a13b723ca38d..ed7de7420b3c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -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;
 }
 
-- 
2.17.1

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  parent reply	other threads:[~2020-05-16  6:24 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-16  6:20 [PATCH 00/18] [PULL REQUEST] iommu/vt-d: patches for v5.8 Lu Baolu
2020-05-16  6:20 ` [PATCH 01/18] iommu/vt-d: Move domain helper to header Lu Baolu
2020-05-16  6:20 ` [PATCH 02/18] iommu/vt-d: Use a helper function to skip agaw for SL Lu Baolu
2020-05-16  6:20 ` [PATCH 03/18] iommu/vt-d: Add nested translation helper function Lu Baolu
2020-05-16  6:20 ` [PATCH 04/18] iommu/vt-d: Add bind guest PASID support Lu Baolu
2020-05-16  6:20 ` [PATCH 05/18] iommu/vt-d: Support flushing more translation cache types Lu Baolu
2020-05-16  6:20 ` [PATCH 06/18] iommu/vt-d: Add svm/sva invalidate function Lu Baolu
2020-05-16  6:20 ` [PATCH 07/18] iommu/vt-d: Enlightened PASID allocation Lu Baolu
2020-05-16  6:20 ` [PATCH 08/18] iommu/vt-d: Add custom allocator for IOASID Lu Baolu
2020-05-16  6:20 ` [PATCH 09/18] iommu/vt-d: Add get_domain_info() helper Lu Baolu
2020-05-16  6:20 ` Lu Baolu [this message]
2020-05-16  6:20 ` [PATCH 11/18] iommu/vt-d: Replace intel SVM APIs with generic SVA APIs Lu Baolu
2020-05-16  6:20 ` [PATCH 12/18] iommu/vt-d: Multiple descriptors per qi_submit_sync() Lu Baolu
2020-05-16  6:20 ` [PATCH 13/18] iommu/vt-d: debugfs: Add support to show inv queue internals Lu Baolu
2020-05-16  6:20 ` [PATCH 14/18] iommu/vt-d: Disable non-recoverable fault processing before unbind Lu Baolu
2020-05-16  6:20 ` [PATCH 15/18] iommu/vt-d: Add page request draining support Lu Baolu
2020-05-16  6:20 ` [PATCH 16/18] iommu/vt-d: Remove redundant IOTLB flush Lu Baolu
2020-05-16  6:21 ` [PATCH 17/18] iommu/vt-d: Remove duplicated check in intel_svm_bind_mm() Lu Baolu
2020-05-16  6:21 ` [PATCH 18/18] iommu/vt-d: Remove IOVA handling code from the non-dma_ops path Lu Baolu
2020-06-17 20:06   ` [Regression] " Alex Williamson
2020-06-18  1:52     ` Lu Baolu
2020-06-18 15:03       ` Alex Williamson
2020-06-18 23:38         ` Lu Baolu
2020-05-18 13:38 ` [PATCH 00/18] [PULL REQUEST] iommu/vt-d: patches for v5.8 Joerg Roedel
2020-05-18 18:50 ` Joerg Roedel
2020-05-19  1:46   ` Lu Baolu

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