arch/x86_64/kernel/pci-swiotlb-xen.c

   1 /* Glue code to lib/swiotlb.c */
   2
   3 #include <linux/pci.h>
   4 #include <linux/cache.h>
   5 #include <linux/module.h>
   6 #include <asm/dma-mapping.h>
   7 #include <asm/proto.h>
   8 #include <asm/swiotlb.h>
   9 #include <asm/dma.h>
  10
  11 #if 0
  12 int swiotlb __read_mostly;
  13 EXPORT_SYMBOL(swiotlb);
  14 #endif
  15
  16 struct dma_mapping_ops swiotlb_dma_ops = {
  17 #if 0
  18         .mapping_error = swiotlb_dma_mapping_error,
  19         .alloc_coherent = swiotlb_alloc_coherent,
  20         .free_coherent = swiotlb_free_coherent,
  21         .map_single = swiotlb_map_single,
  22         .unmap_single = swiotlb_unmap_single,
  23         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  24         .sync_single_for_device = swiotlb_sync_single_for_device,
  25         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
  26         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
  27         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  28         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  29         .map_sg = swiotlb_map_sg,
  30         .unmap_sg = swiotlb_unmap_sg,
  31         .dma_supported = NULL,
  32 #endif
  33 };
  34
  35 void pci_swiotlb_init(void)
  36 {
  37 #if 0
  38         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
  39         if (!iommu_aperture && !no_iommu &&
  40             (end_pfn > MAX_DMA32_PFN || force_iommu))
  41                swiotlb = 1;
  42         if (swiotlb) {
  43                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
  44                 swiotlb_init();
  45                 dma_ops = &swiotlb_dma_ops;
  46         }
  47 #else
  48         swiotlb_init();
  49         if (swiotlb) {
  50                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
  51                 dma_ops = &swiotlb_dma_ops;
  52         }
  53 #endif
  54 }