[PATCH v2 1/7] driver core: Add iommu_group tracking to struct device

From: Alex Williamson
Date: Wed May 30 2012 - 16:19:00 EST


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@xxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---

include/linux/device.h | 2 ++
1 file changed, 2 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 161d962..d0e4d99 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -36,6 +36,7 @@ struct subsys_private;
struct bus_type;
struct device_node;
struct iommu_ops;
+struct iommu_group;

struct bus_attribute {
struct attribute attr;
@@ -687,6 +688,7 @@ 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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