x86, ia64: convert to use generic dma_map_ops struct
[linux-2.6.git] / 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/swiotlb.h>
7 #include <linux/bootmem.h>
8 #include <linux/dma-mapping.h>
9
10 #include <asm/iommu.h>
11 #include <asm/swiotlb.h>
12 #include <asm/dma.h>
13
14 int swiotlb __read_mostly;
15
16 void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
17 {
18         return alloc_bootmem_low_pages(size);
19 }
20
21 void *swiotlb_alloc(unsigned order, unsigned long nslabs)
22 {
23         return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
24 }
25
26 dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
27 {
28         return paddr;
29 }
30
31 phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr)
32 {
33         return baddr;
34 }
35
36 int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
37 {
38         return 0;
39 }
40
41 /* these will be moved to lib/swiotlb.c later on */
42
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)
47 {
48         return swiotlb_map_single(dev, page_address(page) + offset, size, dir);
49 }
50
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)
54 {
55         swiotlb_unmap_single(dev, dma_handle, size, dir);
56 }
57
58 static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
59                                         dma_addr_t *dma_handle, gfp_t flags)
60 {
61         void *vaddr;
62
63         vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags);
64         if (vaddr)
65                 return vaddr;
66
67         return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
68 }
69
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,
85 };
86
87 void __init pci_swiotlb_init(void)
88 {
89         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
90 #ifdef CONFIG_X86_64
91         if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
92                swiotlb = 1;
93 #endif
94         if (swiotlb_force)
95                 swiotlb = 1;
96         if (swiotlb) {
97                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
98                 swiotlb_init();
99                 dma_ops = &swiotlb_dma_ops;
100         }
101 }