linux-kernel - [PATCH 08/19] swiotlb-xen: Don't allocate DMA-memory beyond 4GB in 32-bit mode.

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Date:	Tue, 22 Jun 2010 15:42:41 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, albert_herranz@...oo.es,
	x86@...nel.org
Cc:	"Ronny.Hegewald@...ine.de" <Ronny.Hegewald@...ine.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 08/19] swiotlb-xen: Don't allocate DMA-memory beyond 4GB in 32-bit mode.

From: Ronny.Hegewald@...ine.de <Ronny.Hegewald@...ine.de>

When running in 32-bit PV environment various drivers try to allocate
a coherent DMA memory and the Xen SWIOTLB would return memory beyond 4GB.

On bare-metal the coherent DMA-memory using the native SWIOTLB would
always allocate memory inside the 32-bit address-range by calling
dma_alloc_coherent_mask.

The attached patch adds the same functionality to Xen SWIOTLB.

Signed-off-by: Ronny Hegewald <Ronny.Hegewald@...ine.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 lib/swiotlb-xen.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/swiotlb-xen.c b/lib/swiotlb-xen.c
index 89443e4..2ebfcbd 100644
--- a/lib/swiotlb-xen.c
+++ b/lib/swiotlb-xen.c
@@ -150,7 +150,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	ret = (void *)vstart;
 
 	if (hwdev && hwdev->coherent_dma_mask)
-		dma_mask = hwdev->coherent_dma_mask;
+		dma_mask = dma_alloc_coherent_mask(hwdev, flags);
 
 	if (ret) {
 		if (xen_create_contiguous_region(vstart, order,
-- 
1.7.0.1

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