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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>,
	Alex Williamson <alex.williamson@redhat.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Kevin Tian <kevin.tian@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Ashok Raj <ashok.raj@intel.com>,
	kvm@vger.kernel.org, Cornelia Huck <cohuck@redhat.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Robin Murphy <robin.murphy@arm.com>
Subject: [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev()
Date: Tue, 14 Jul 2020 13:57:02 +0800
Message-ID: <20200714055703.5510-4-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20200714055703.5510-1-baolu.lu@linux.intel.com>

The device driver needs an API to get its aux-domain. A typical usage
scenario is:

        unsigned long pasid;
        struct iommu_domain *domain;
        struct device *dev = mdev_dev(mdev);
        struct device *iommu_device = vfio_mdev_get_iommu_device(dev);

        domain = iommu_aux_get_domain_for_dev(dev);
        if (!domain)
                return -ENODEV;

        pasid = iommu_aux_get_pasid(domain, iommu_device);
        if (pasid <= 0)
                return -EINVAL;

         /* Program the device context */
         ....

This adds an API for such use case.

Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/iommu.c | 18 ++++++++++++++++++
 include/linux/iommu.h |  7 +++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index cad5a19ebf22..434bf42b6b9b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2817,6 +2817,24 @@ void iommu_aux_detach_group(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_aux_detach_group);
 
+struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev)
+{
+	struct iommu_domain *domain = NULL;
+	struct iommu_group *group;
+
+	group = iommu_group_get(dev);
+	if (!group)
+		return NULL;
+
+	if (group->aux_domain_attached)
+		domain = group->domain;
+
+	iommu_group_put(group);
+
+	return domain;
+}
+EXPORT_SYMBOL_GPL(iommu_aux_get_domain_for_dev);
+
 /**
  * iommu_sva_bind_device() - Bind a process address space to a device
  * @dev: the device
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9506551139ab..cda6cef7579e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -639,6 +639,7 @@ int iommu_aux_attach_group(struct iommu_domain *domain,
 			   struct iommu_group *group, struct device *dev);
 void iommu_aux_detach_group(struct iommu_domain *domain,
 			   struct iommu_group *group, struct device *dev);
+struct iommu_domain *iommu_aux_get_domain_for_dev(struct device *dev);
 
 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 					struct mm_struct *mm,
@@ -1040,6 +1041,12 @@ iommu_aux_detach_group(struct iommu_domain *domain,
 {
 }
 
+static inline struct iommu_domain *
+iommu_aux_get_domain_for_dev(struct device *dev)
+{
+	return NULL;
+}
+
 static inline struct iommu_sva *
 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
 {
-- 
2.17.1

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  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14  5:56 [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu
2020-07-14  5:57 ` [PATCH v3 1/4] iommu: Check IOMMU_DEV_FEAT_AUX feature in aux api's Lu Baolu
2020-07-29 20:03   ` Alex Williamson
2020-07-30  1:46     ` Lu Baolu
2020-07-14  5:57 ` [PATCH v3 2/4] iommu: Add iommu_aux_at(de)tach_group() Lu Baolu
2020-07-14 16:39   ` Jacob Pan
2020-07-15  0:47     ` Lu Baolu
2020-07-15 16:01       ` Jacob Pan
2020-07-16  1:07         ` Lu Baolu
2020-07-29 20:03           ` Alex Williamson
2020-07-29 23:34             ` Tian, Kevin
2020-07-30 19:46               ` Alex Williamson
2020-07-31  5:47                 ` Lu Baolu
2020-07-31 18:05                   ` Alex Williamson
2020-08-03  1:57                     ` Lu Baolu
2020-07-14  5:57 ` Lu Baolu [this message]
2020-07-29 20:25   ` [PATCH v3 3/4] iommu: Add iommu_aux_get_domain_for_dev() Alex Williamson
2020-07-29 23:49     ` Tian, Kevin
2020-07-30 20:17       ` Alex Williamson
2020-07-31  0:26         ` Tian, Kevin
2020-07-31  2:17         ` Tian, Kevin
2020-07-31  6:30     ` Lu Baolu
2020-07-31 18:14       ` Alex Williamson
2020-08-03  2:15         ` Lu Baolu
2020-07-14  5:57 ` [PATCH v3 4/4] vfio/type1: Use iommu_aux_at(de)tach_group() APIs Lu Baolu
2020-07-14  8:25   ` Christoph Hellwig
2020-07-14 16:29     ` Jacob Pan
2020-07-15  1:00       ` Lu Baolu
2020-07-15  1:23         ` Tian, Kevin
2020-07-29 20:32   ` Alex Williamson
2020-07-30  2:41     ` Lu Baolu
2020-07-30 21:17       ` Alex Williamson
2020-07-31  1:37         ` Lu Baolu
2020-07-30  9:36   ` Liu, Yi L
2020-07-31  1:39     ` Lu Baolu
2020-07-23 13:55 ` [PATCH v3 0/4] iommu aux-domain APIs extensions Lu Baolu

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