linux-kernel - [PATCH 8/8] iommu: Move default domain allocation to iommu_group_get_for

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Date:	Wed, 21 Oct 2015 23:51:43 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 8/8] iommu: Move default domain allocation to iommu_group_get_for_dev()

From: Joerg Roedel <jroedel@...e.de>

Now that the iommu core support for iommu groups is not
pci-centric anymore, we can move default domain allocation
to the bus independent iommu_group_get_for_dev() function.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/iommu.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index e2b5526..abae363 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -810,14 +810,6 @@ struct iommu_group *pci_device_group(struct device *dev)
 	if (IS_ERR(group))
 		return NULL;
 
-	/*
-	 * Try to allocate a default domain - needs support from the
-	 * IOMMU driver.
-	 */
-	group->default_domain = __iommu_domain_alloc(pdev->dev.bus,
-						     IOMMU_DOMAIN_DMA);
-	group->domain = group->default_domain;
-
 	return group;
 }
 
@@ -849,6 +841,16 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 	if (IS_ERR(group))
 		return group;
 
+	/*
+	 * Try to allocate a default domain - needs support from the
+	 * IOMMU driver.
+	 */
+	if (!group->default_domain) {
+		group->default_domain = __iommu_domain_alloc(dev->bus,
+							     IOMMU_DOMAIN_DMA);
+		group->domain = group->default_domain;
+	}
+
 	ret = iommu_group_add_device(group, dev);
 	if (ret) {
 		iommu_group_put(group);
-- 
1.9.1

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