linux-kernel - [PATCH 01/13] driver core: Add iommu

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Date:	Fri, 11 May 2012 16:55:35 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	benh@...nel.crashing.org, aik@...abs.ru,
	david@...son.dropbear.id.au, joerg.roedel@....com,
	dwmw2@...radead.org
Cc:	chrisw@...s-sol.org, agraf@...e.de, benve@...co.com,
	aafabbri@...co.com, B08248@...escale.com, B07421@...escale.com,
	avi@...hat.com, konrad.wilk@...cle.com, kvm@...r.kernel.org,
	qemu-devel@...gnu.org, iommu@...ts.linux-foundation.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, bhelgaas@...gle.com,
	alex.williamson@...hat.com
Subject: [PATCH 01/13] driver core: Add iommu_group tracking to struct device

IOMMU groups allow IOMMU drivers to represent DMA visibility
and isolation of devices.  Multiple devices may be grouped
together for the purposes of DMA.  Placing a pointer on
struct device enable easy access for things like streaming
DMA programming and drivers like VFIO.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---

 include/linux/device.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/device.h b/include/linux/device.h
index 5ad17cc..13dd26b 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -35,6 +35,7 @@ struct subsys_private;
 struct bus_type;
 struct device_node;
 struct iommu_ops;
+struct iommu_group;
 
 struct bus_attribute {
 	struct attribute	attr;
@@ -677,6 +678,7 @@ struct device {
 	const struct attribute_group **groups;	/* optional groups */
 
 	void	(*release)(struct device *dev);
+	struct iommu_group	*iommu_group;
 };
 
 /* Get the wakeup routines, which depend on struct device */

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