This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / x86_64 / kernel / pci-swiotlb-xen.c

diff --git a/arch/x86_64/kernel/pci-swiotlb-xen.c b/arch/x86_64/kernel/pci-swiotlb-xen.c
new file mode 100644 (file)
index 0000000..0a5a8d4
--- /dev/null
+++ b/arch/x86_64/kernel/pci-swiotlb-xen.c
@@ -0,0 +1,54 @@
+/* Glue code to lib/swiotlb.c */
+
+#include <linux/pci.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <asm/dma-mapping.h>
+#include <asm/proto.h>
+#include <asm/swiotlb.h>
+#include <asm/dma.h>
+
+#if 0
+int swiotlb __read_mostly;
+EXPORT_SYMBOL(swiotlb);
+#endif
+
+struct dma_mapping_ops swiotlb_dma_ops = {
+#if 0
+       .mapping_error = swiotlb_dma_mapping_error,
+       .alloc_coherent = swiotlb_alloc_coherent,
+       .free_coherent = swiotlb_free_coherent,
+       .map_single = swiotlb_map_single,
+       .unmap_single = swiotlb_unmap_single,
+       .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+       .sync_single_for_device = swiotlb_sync_single_for_device,
+       .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
+       .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
+       .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+       .sync_sg_for_device = swiotlb_sync_sg_for_device,
+       .map_sg = swiotlb_map_sg,
+       .unmap_sg = swiotlb_unmap_sg,
+       .dma_supported = NULL,
+#endif
+};
+
+void pci_swiotlb_init(void)
+{
+#if 0
+       /* don't initialize swiotlb if iommu=off (no_iommu=1) */
+       if (!iommu_aperture && !no_iommu &&
+           (end_pfn > MAX_DMA32_PFN || force_iommu))
+              swiotlb = 1;
+       if (swiotlb) {
+               printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
+               swiotlb_init();
+               dma_ops = &swiotlb_dma_ops;
+       }
+#else
+       swiotlb_init();
+       if (swiotlb) {
+               printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
+               dma_ops = &swiotlb_dma_ops;
+       }
+#endif
+}