linux-kernel - [PATCH v2 07/15] iommu: Add iommu_realloc_dev

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Date:   Mon, 10 May 2021 22:17:21 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
        <hch@....de>, <m.szyprowski@...sung.com>
CC:     <iommu@...ts.linux-foundation.org>, <baolu.lu@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linuxarm@...wei.com>, <sai.praneeth.prakhya@...el.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v2 07/15] iommu: Add iommu_realloc_dev_group()

Add a function to re-alloc IOMMU group default domain.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/iommu/iommu.c | 12 ++++++++++++
 include/linux/iommu.h |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f7253a973ab9..bdb9aa47dfca 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3191,6 +3191,18 @@ static int iommu_change_dev_def_domain(struct iommu_group *group,
 	return ret;
 }
 
+int iommu_realloc_dev_group(struct device *dev)
+{
+	struct iommu_group *group;
+	int ret;
+
+	group = iommu_group_get(dev);
+	ret = iommu_change_dev_def_domain(group, dev, 0, true);
+	iommu_group_put(group);
+
+	return ret;
+}
+
 /*
  * Changing the default domain or any other IOMMU group attribute through sysfs
  * requires the users to unbind the drivers from the devices in the IOMMU group.
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e26abda94792..6e187746af0f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -482,6 +482,7 @@ bool iommu_get_dma_strict(struct iommu_domain *domain);
 
 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 			      unsigned long iova, int flags);
+extern int iommu_realloc_dev_group(struct device *dev);
 
 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
 {
@@ -699,6 +700,11 @@ static inline size_t iommu_map_sg_atomic(struct iommu_domain *domain,
 	return 0;
 }
 
+static inline int iommu_realloc_dev_group(struct device *dev)
+{
+	return -ENODEV;
+}
+
 static inline void iommu_flush_iotlb_all(struct iommu_domain *domain)
 {
 }
-- 
2.26.2