Commit | Line | Data |
---|---|---|
17a941d8 MBY |
1 | /* Glue code to lib/swiotlb.c */ |
2 | ||
3 | #include <linux/pci.h> | |
4 | #include <linux/cache.h> | |
5 | #include <linux/module.h> | |
8ce79960 JF |
6 | #include <linux/swiotlb.h> |
7 | #include <linux/bootmem.h> | |
d6bd3a39 REB |
8 | #include <linux/dma-mapping.h> |
9 | ||
46a7fa27 | 10 | #include <asm/iommu.h> |
17a941d8 MBY |
11 | #include <asm/swiotlb.h> |
12 | #include <asm/dma.h> | |
c116c545 KRW |
13 | #include <asm/xen/swiotlb-xen.h> |
14 | #include <asm/iommu_table.h> | |
17a941d8 | 15 | int swiotlb __read_mostly; |
17a941d8 | 16 | |
9c5a3621 | 17 | void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
baa676fc AP |
18 | dma_addr_t *dma_handle, gfp_t flags, |
19 | struct dma_attrs *attrs) | |
03967c52 FT |
20 | { |
21 | void *vaddr; | |
22 | ||
186dfc9d JR |
23 | /* |
24 | * Don't print a warning when the first allocation attempt fails. | |
25 | * swiotlb_alloc_coherent() will print a warning when the DMA | |
26 | * memory allocation ultimately failed. | |
27 | */ | |
28 | flags |= __GFP_NOWARN; | |
29 | ||
baa676fc AP |
30 | vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags, |
31 | attrs); | |
03967c52 FT |
32 | if (vaddr) |
33 | return vaddr; | |
34 | ||
35 | return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags); | |
36 | } | |
37 | ||
9c5a3621 | 38 | void x86_swiotlb_free_coherent(struct device *dev, size_t size, |
baa676fc AP |
39 | void *vaddr, dma_addr_t dma_addr, |
40 | struct dma_attrs *attrs) | |
41 | { | |
9c5a3621 AM |
42 | if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr))) |
43 | swiotlb_free_coherent(dev, size, vaddr, dma_addr); | |
44 | else | |
45 | dma_generic_free_coherent(dev, size, vaddr, dma_addr, attrs); | |
baa676fc AP |
46 | } |
47 | ||
ff6c6fed | 48 | static struct dma_map_ops swiotlb_dma_ops = { |
17a941d8 | 49 | .mapping_error = swiotlb_dma_mapping_error, |
baa676fc AP |
50 | .alloc = x86_swiotlb_alloc_coherent, |
51 | .free = x86_swiotlb_free_coherent, | |
17a941d8 MBY |
52 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, |
53 | .sync_single_for_device = swiotlb_sync_single_for_device, | |
17a941d8 MBY |
54 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, |
55 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | |
160c1d8e FT |
56 | .map_sg = swiotlb_map_sg_attrs, |
57 | .unmap_sg = swiotlb_unmap_sg_attrs, | |
4cf37bb7 FT |
58 | .map_page = swiotlb_map_page, |
59 | .unmap_page = swiotlb_unmap_page, | |
17a941d8 MBY |
60 | .dma_supported = NULL, |
61 | }; | |
62 | ||
b18485e7 | 63 | /* |
efa631c2 | 64 | * pci_swiotlb_detect_override - set swiotlb to 1 if necessary |
b18485e7 FT |
65 | * |
66 | * This returns non-zero if we are forced to use swiotlb (by the boot | |
67 | * option). | |
68 | */ | |
efa631c2 | 69 | int __init pci_swiotlb_detect_override(void) |
17a941d8 | 70 | { |
273bee27 FT |
71 | int use_swiotlb = swiotlb | swiotlb_force; |
72 | ||
efa631c2 KRW |
73 | if (swiotlb_force) |
74 | swiotlb = 1; | |
75 | ||
76 | return use_swiotlb; | |
77 | } | |
c116c545 KRW |
78 | IOMMU_INIT_FINISH(pci_swiotlb_detect_override, |
79 | pci_xen_swiotlb_detect, | |
80 | pci_swiotlb_init, | |
81 | pci_swiotlb_late_init); | |
efa631c2 KRW |
82 | |
83 | /* | |
84 | * if 4GB or more detected (and iommu=off not set) return 1 | |
85 | * and set swiotlb to 1. | |
86 | */ | |
87 | int __init pci_swiotlb_detect_4gb(void) | |
88 | { | |
17a941d8 | 89 | /* don't initialize swiotlb if iommu=off (no_iommu=1) */ |
cfb80c9e | 90 | #ifdef CONFIG_X86_64 |
ec941c5f | 91 | if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN) |
19943b0e | 92 | swiotlb = 1; |
cfb80c9e | 93 | #endif |
efa631c2 | 94 | return swiotlb; |
186a2502 | 95 | } |
c116c545 KRW |
96 | IOMMU_INIT(pci_swiotlb_detect_4gb, |
97 | pci_swiotlb_detect_override, | |
98 | pci_swiotlb_init, | |
99 | pci_swiotlb_late_init); | |
186a2502 FT |
100 | |
101 | void __init pci_swiotlb_init(void) | |
102 | { | |
17a941d8 | 103 | if (swiotlb) { |
ad32e8cb | 104 | swiotlb_init(0); |
17a941d8 | 105 | dma_ops = &swiotlb_dma_ops; |
a3b28ee1 | 106 | } |
17a941d8 | 107 | } |
efa631c2 KRW |
108 | |
109 | void __init pci_swiotlb_late_init(void) | |
110 | { | |
111 | /* An IOMMU turned us off. */ | |
112 | if (!swiotlb) | |
113 | swiotlb_free(); | |
114 | else { | |
115 | printk(KERN_INFO "PCI-DMA: " | |
116 | "Using software bounce buffering for IO (SWIOTLB)\n"); | |
117 | swiotlb_print_info(); | |
118 | } | |
119 | } |