arch/x86/kernel/pci-swiotlb_64.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 <linux/dma-mapping.h>
   7
   8 #include <asm/gart.h>
   9 #include <asm/swiotlb.h>
  10 #include <asm/dma.h>
  11
  12 int swiotlb __read_mostly;
  13
  14 static dma_addr_t
  15 swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
  16                         int direction)
  17 {
  18         return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
  19 }
  20
  21 const struct dma_mapping_ops swiotlb_dma_ops = {
  22         .mapping_error = swiotlb_dma_mapping_error,
  23         .alloc_coherent = swiotlb_alloc_coherent,
  24         .free_coherent = swiotlb_free_coherent,
  25         .map_single = swiotlb_map_single_phys,
  26         .unmap_single = swiotlb_unmap_single,
  27         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  28         .sync_single_for_device = swiotlb_sync_single_for_device,
  29         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
  30         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
  31         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  32         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  33         .map_sg = swiotlb_map_sg,
  34         .unmap_sg = swiotlb_unmap_sg,
  35         .dma_supported = NULL,
  36 };
  37
  38 void __init pci_swiotlb_init(void)
  39 {
  40         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
  41         if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
  42                swiotlb = 1;
  43         if (swiotlb_force)
  44                 swiotlb = 1;
  45         if (swiotlb) {
  46                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
  47                 swiotlb_init();
  48                 dma_ops = &swiotlb_dma_ops;
  49         }
  50 }