linux-kernel - [PATCH RFC v2 06/11] iommu/vt-d: Add SVA domain support

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Date:   Tue, 29 Mar 2022 13:37:55 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     Eric Auger <eric.auger@...hat.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH RFC v2 06/11] iommu/vt-d: Add SVA domain support

Add support for SVA domain allocation and provide an SVA-specific
iommu_domain_ops.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 include/linux/intel-iommu.h |  1 +
 drivers/iommu/intel/iommu.c | 10 ++++++++++
 drivers/iommu/intel/svm.c   | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 2f9891cb3d00..c14283137fb5 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -744,6 +744,7 @@ void intel_svm_unbind(struct iommu_sva *handle);
 u32 intel_svm_get_pasid(struct iommu_sva *handle);
 int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
 			    struct iommu_page_response *msg);
+extern const struct iommu_domain_ops intel_svm_domain_ops;
 
 struct intel_svm_dev {
 	struct list_head list;
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index c1b91bce1530..5eae7cf9bee5 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4318,6 +4318,16 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
 		return domain;
 	case IOMMU_DOMAIN_IDENTITY:
 		return &si_domain->domain;
+#ifdef CONFIG_INTEL_IOMMU_SVM
+	case IOMMU_DOMAIN_SVA:
+		dmar_domain = alloc_domain(type);
+		if (!dmar_domain)
+			return NULL;
+		domain = &dmar_domain->domain;
+		domain->ops = &intel_svm_domain_ops;
+
+		return domain;
+#endif /* CONFIG_INTEL_IOMMU_SVM */
 	default:
 		return NULL;
 	}
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ee5ecde5b318..8f59dd641b2d 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -932,3 +932,40 @@ int intel_svm_page_response(struct device *dev,
 	mutex_unlock(&pasid_mutex);
 	return ret;
 }
+
+static int intel_svm_attach_dev_pasid(struct iommu_domain *domain,
+				      struct device *dev, ioasid_t pasid)
+{
+	struct device_domain_info *info = dev_iommu_priv_get(dev);
+	struct mm_struct *mm = iommu_sva_domain_mm(domain);
+	struct intel_iommu *iommu = info->iommu;
+	struct iommu_sva *sva;
+	int ret = 0;
+
+	mutex_lock(&pasid_mutex);
+	sva = intel_svm_bind_mm(iommu, dev, mm);
+	if (IS_ERR(sva))
+		ret = PTR_ERR(sva);
+	mutex_unlock(&pasid_mutex);
+
+	return ret;
+}
+
+static void intel_svm_detach_dev_pasid(struct iommu_domain *domain,
+				       struct device *dev, ioasid_t pasid)
+{
+	mutex_lock(&pasid_mutex);
+	intel_svm_unbind_mm(dev, pasid);
+	mutex_unlock(&pasid_mutex);
+}
+
+static void intel_svm_domain_free(struct iommu_domain *domain)
+{
+	kfree(domain);
+}
+
+const struct iommu_domain_ops intel_svm_domain_ops = {
+	.attach_dev_pasid	= intel_svm_attach_dev_pasid,
+	.detach_dev_pasid	= intel_svm_detach_dev_pasid,
+	.free			= intel_svm_domain_free,
+};
-- 
2.25.1