linux-kernel - [PATCH 12/19] swiotlb-xen: Make 'xen_swiotlb_map_sg

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Date:	Tue, 22 Jun 2010 15:42:45 -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:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 12/19] swiotlb-xen: Make 'xen_swiotlb_map_sg_attrs' work.

Refer to "swiotlb-xen: Make 'xen_swiotlb_[map|unmap]_page' work." for
details why we want to use our own address translation mechanism.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 lib/swiotlb-xen.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/swiotlb-xen.c b/lib/swiotlb-xen.c
index ca6c537..d457f7e 100644
--- a/lib/swiotlb-xen.c
+++ b/lib/swiotlb-xen.c
@@ -343,10 +343,11 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 
 	for_each_sg(sgl, sg, nelems, i) {
 		phys_addr_t paddr = sg_phys(sg);
-		dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
+		dma_addr_t dev_addr = xen_phys_to_bus(hwdev, paddr);
 
 		if (swiotlb_force ||
-		    !dma_capable(hwdev, dev_addr, sg->length)) {
+		    !dma_capable(hwdev, dev_addr, sg->length) ||
+		    range_straddles_page_boundary(paddr, sg->length)) {
 			void *map = xen_map_single(hwdev, sg_phys(sg),
 						   sg->length, dir);
 			if (!map) {
-- 
1.7.0.1

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