linux-kernel - [PATCH 1/1] XEN: Use correct masking in xen_swiotlb_alloc

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Date:	Fri, 31 Aug 2012 10:57:52 +0100
From:	Stefano Panella <stefano.panella@...rix.com>
To:	<linux-kernel@...r.kernel.org>, <konrad.wilk@...cle.com>,
	<xen-devel@...ts.xensource.com>
CC:	Stefano Panella <stefano.panella@...rix.com>
Subject: [PATCH 1/1] XEN: Use correct masking in xen_swiotlb_alloc_coherent.

When running 32-bit pvops-dom0 and a driver tries to allocate a coherent
DMA-memory the xen swiotlb-implementation returned memory beyond 4GB.

This caused for example not working sound on a system with 4 GB and a 64-bit
compatible sound-card with sets the DMA-mask to 64bit.

On bare-metal and the forward-ported xen-dom0 patches from OpenSuse a coherent
DMA-memory is always allocated inside the 32-bit address-range by calling
dma_alloc_coherent_mask.

This patch adds the same functionality to xen swiotlb and is a rebase of the
original patch from Ronny Hegewald which never got upstream for some reason.

The original email with the original patch is in:

http://old-list-archives.xen.org/archives/html/xen-devel/2010-02/msg00038.html

the original thread from where the deiscussion started is in:

http://old-list-archives.xen.org/archives/html/xen-devel/2010-01/msg00928.html

Signed-off-by: Ronny Hegewald
Signed-off-by: Stefano Panella <stefano.panella@...rix.com>
---
 drivers/xen/swiotlb-xen.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 1afb4fb..4d51948 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -232,7 +232,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 		return ret;

 	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = hwdev->coherent_dma_mask;
+		dma_mask = dma_alloc_coherent_mask(hwdev, flags);

 	phys = virt_to_phys(ret);
 	dev_addr = xen_phys_to_bus(phys);
-- 
1.7.4.1

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