1 /* Glue code to lib/swiotlb.c */
4 #include <linux/cache.h>
5 #include <linux/module.h>
6 #include <linux/swiotlb.h>
7 #include <linux/bootmem.h>
8 #include <linux/dma-mapping.h>
10 #include <asm/iommu.h>
11 #include <asm/swiotlb.h>
14 int swiotlb __read_mostly;
16 void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
18 return alloc_bootmem_low_pages(size);
21 void *swiotlb_alloc(unsigned order, unsigned long nslabs)
23 return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
26 dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
31 phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr)
36 int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
41 /* these will be moved to lib/swiotlb.c later on */
43 static dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
44 unsigned long offset, size_t size,
45 enum dma_data_direction dir,
46 struct dma_attrs *attrs)
48 return swiotlb_map_single(dev, page_address(page) + offset, size, dir);
51 static void swiotlb_unmap_page(struct device *dev, dma_addr_t dma_handle,
52 size_t size, enum dma_data_direction dir,
53 struct dma_attrs *attrs)
55 swiotlb_unmap_single(dev, dma_handle, size, dir);
58 static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
59 dma_addr_t *dma_handle, gfp_t flags)
63 vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags);
67 return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
70 struct dma_map_ops swiotlb_dma_ops = {
71 .mapping_error = swiotlb_dma_mapping_error,
72 .alloc_coherent = x86_swiotlb_alloc_coherent,
73 .free_coherent = swiotlb_free_coherent,
74 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
75 .sync_single_for_device = swiotlb_sync_single_for_device,
76 .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
77 .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
78 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
79 .sync_sg_for_device = swiotlb_sync_sg_for_device,
80 .map_sg = swiotlb_map_sg_attrs,
81 .unmap_sg = swiotlb_unmap_sg_attrs,
82 .map_page = swiotlb_map_page,
83 .unmap_page = swiotlb_unmap_page,
84 .dma_supported = NULL,
87 void __init pci_swiotlb_init(void)
89 /* don't initialize swiotlb if iommu=off (no_iommu=1) */
91 if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
97 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
99 dma_ops = &swiotlb_dma_ops;