X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fx86_64%2Fkernel%2Fpci-swiotlb.c;h=4e116201b801d42cdd432dfef95111869b037026;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=6a55f87ba97f917ed2814bc3c11c3f21a3ad096b;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git

diff --git a/arch/x86_64/kernel/pci-swiotlb.c b/arch/x86_64/kernel/pci-swiotlb.c
index 6a55f87ba..4e116201b 100644
--- a/arch/x86_64/kernel/pci-swiotlb.c
+++ b/arch/x86_64/kernel/pci-swiotlb.c
@@ -3,15 +3,19 @@
 #include <linux/pci.h>
 #include <linux/cache.h>
 #include <linux/module.h>
-#include <asm/dma-mapping.h>
+#include <linux/dma-mapping.h>
+
 #include <asm/proto.h>
 #include <asm/swiotlb.h>
 #include <asm/dma.h>
 
+#ifndef CONFIG_XEN
 int swiotlb __read_mostly;
 EXPORT_SYMBOL(swiotlb);
+#endif
 
 struct dma_mapping_ops swiotlb_dma_ops = {
+#ifndef CONFIG_XEN
 	.mapping_error = swiotlb_dma_mapping_error,
 	.alloc_coherent = swiotlb_alloc_coherent,
 	.free_coherent = swiotlb_free_coherent,
@@ -26,10 +30,18 @@ struct dma_mapping_ops swiotlb_dma_ops = {
 	.map_sg = swiotlb_map_sg,
 	.unmap_sg = swiotlb_unmap_sg,
 	.dma_supported = NULL,
+#endif
 };
 
 void pci_swiotlb_init(void)
 {
+#ifdef CONFIG_XEN
+	swiotlb_init();
+	if (swiotlb) {
+		printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
+		dma_ops = &swiotlb_dma_ops;
+	}
+#else
 	/* don't initialize swiotlb if iommu=off (no_iommu=1) */
 	if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
 	       swiotlb = 1;
@@ -40,4 +52,5 @@ void pci_swiotlb_init(void)
 		swiotlb_init();
 		dma_ops = &swiotlb_dma_ops;
 	}
+#endif /* CONFIG_XEN */
 }