swiotlb: remove unused swiotlb_alloc_boot()
[linux-2.6.git] / arch / x86 / kernel / pci-swiotlb.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 *swiotlb_alloc(unsigned order, unsigned long nslabs)
17 {
18         return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
19 }
20
21 dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
22 {
23         return paddr;
24 }
25
26 phys_addr_t swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr)
27 {
28         return baddr;
29 }
30
31 int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)
32 {
33         return 0;
34 }
35
36 static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
37                                         dma_addr_t *dma_handle, gfp_t flags)
38 {
39         void *vaddr;
40
41         vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags);
42         if (vaddr)
43                 return vaddr;
44
45         return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
46 }
47
48 static struct dma_map_ops swiotlb_dma_ops = {
49         .mapping_error = swiotlb_dma_mapping_error,
50         .alloc_coherent = x86_swiotlb_alloc_coherent,
51         .free_coherent = swiotlb_free_coherent,
52         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
53         .sync_single_for_device = swiotlb_sync_single_for_device,
54         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
55         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
56         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
57         .sync_sg_for_device = swiotlb_sync_sg_for_device,
58         .map_sg = swiotlb_map_sg_attrs,
59         .unmap_sg = swiotlb_unmap_sg_attrs,
60         .map_page = swiotlb_map_page,
61         .unmap_page = swiotlb_unmap_page,
62         .dma_supported = NULL,
63 };
64
65 void __init pci_swiotlb_init(void)
66 {
67         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
68 #ifdef CONFIG_X86_64
69         if ((!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) ||
70                 iommu_pass_through)
71                swiotlb = 1;
72 #endif
73         if (swiotlb_force)
74                 swiotlb = 1;
75         if (swiotlb) {
76                 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
77                 swiotlb_init();
78                 dma_ops = &swiotlb_dma_ops;
79         }
80 }