linux-kernel - [PATCH 7/7] ppc64 iommu: use coherent_dma_mask for alloc

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Date:	Mon, 18 Oct 2010 10:27:04 -0700
From:	Nishanth Aravamudan <nacc@...ibm.com>
To:	nacc@...ibm.com
Cc:	miltonm@....com, Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Brian King <brking@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] ppc64 iommu: use coherent_dma_mask for alloc_coherent

The IOMMU code has been passing the dma-mask instead of the
coherent_dma_mask to the iommu allocator.  Coherent allocations should
be made using the coherent_dma_mask.

Also update the vio code to ensure the coherent_dma_mask is set. Without
this change drivers, such as ibmvscsi, fail to load with the corrected
dma_iommu_alloc_coherent().

Signed-off-by: Milton Miller <miltonm@....com>
Signed-off-by: Nishanth Aravamudan <nacc@...ibm.com>
---
We currently don't check the mask other than to warn when its being set,
so I don't think this is stable material.
---
 arch/powerpc/kernel/dma-iommu.c |    2 +-
 arch/powerpc/kernel/vio.c       |    4 ++++
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index 6e54a0f..e755415 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -19,7 +19,7 @@ static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
 				      dma_addr_t *dma_handle, gfp_t flag)
 {
 	return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
-				    dma_handle, device_to_mask(dev), flag,
+				    dma_handle, dev->coherent_dma_mask, flag,
 				    dev_to_node(dev));
 }
 
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 3c3083f..f15b3df 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1259,6 +1259,10 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
 	viodev->dev.parent = &vio_bus_device.dev;
 	viodev->dev.bus = &vio_bus_type;
 	viodev->dev.release = vio_dev_release;
+        /* needed to ensure proper operation of coherent allocations
+         * later, in case driver doesn't set it explicitly */
+        dma_set_mask(&viodev->dev, DMA_BIT_MASK(64));
+        dma_set_coherent_mask(&viodev->dev, DMA_BIT_MASK(64));
 
 	/* register with generic device framework */
 	if (device_register(&viodev->dev)) {
-- 
1.7.1

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