[PATCH 2/5 v11] powerpc: Add iommu domain pointer to device archdata

[Varun Sethi <Varun.Sethi-KZfg59tc24xl57MIdRCFDg@public.gmane.org>]

Add an iommu domain pointer to device (powerpc) archdata.  Devices
are attached to iommu domains and this pointer provides a mechanism
to correlate between a device and the associated iommu domain.  This
field is set when a device is attached to a domain.

Signed-off-by: Varun Sethi <Varun.Sethi-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
- no change in v11.
- no change in v10.
- Added CONFIG_IOMMU_API in v9.
 arch/powerpc/include/asm/device.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h
index 77e97dd..2d5c1c5 100644
--- a/arch/powerpc/include/asm/device.h
+++ b/arch/powerpc/include/asm/device.h
@@ -28,6 +28,12 @@ struct dev_archdata {
 		void		*iommu_table_base;
 	} dma_data;
 
+	/* IOMMU domain information pointer. This would be set
+	 * when this device is attached to an iommu_domain.
+	 */
+#ifdef CONFIG_IOMMU_API
+	void			*iommu_domain;
+#endif
 #ifdef CONFIG_SWIOTLB
 	dma_addr_t		max_direct_dma_addr;
 #endif
-- 
1.7.4.1