H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_DMA_MAPPING_H |
| 2 | #define _ASM_X86_DMA_MAPPING_H |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 3 | |
| 4 | /* |
Randy Dunlap | 5872fb9 | 2009-01-29 16:28:02 -0800 | [diff] [blame] | 5 | * IOMMU interface. See Documentation/PCI/PCI-DMA-mapping.txt and |
| 6 | * Documentation/DMA-API.txt for documentation. |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 7 | */ |
| 8 | |
Vegard Nossum | d700285 | 2008-07-20 10:44:54 +0200 | [diff] [blame] | 9 | #include <linux/kmemcheck.h> |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 10 | #include <linux/scatterlist.h> |
Joerg Roedel | 2118d0c | 2009-01-09 15:13:15 +0100 | [diff] [blame] | 11 | #include <linux/dma-debug.h> |
FUJITA Tomonori | abe6602 | 2009-01-05 23:47:21 +0900 | [diff] [blame] | 12 | #include <linux/dma-attrs.h> |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 13 | #include <asm/io.h> |
| 14 | #include <asm/swiotlb.h> |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 15 | #include <asm-generic/dma-coherent.h> |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 16 | |
Glauber Costa | 7c18341 | 2008-03-25 18:36:36 -0300 | [diff] [blame] | 17 | extern dma_addr_t bad_dma_address; |
Glauber Costa | b7107a3 | 2008-03-25 18:36:39 -0300 | [diff] [blame] | 18 | extern int iommu_merge; |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 19 | extern struct device x86_dma_fallback_dev; |
Glauber Costa | b7107a3 | 2008-03-25 18:36:39 -0300 | [diff] [blame] | 20 | extern int panic_on_overflow; |
Glauber Costa | 7c18341 | 2008-03-25 18:36:36 -0300 | [diff] [blame] | 21 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 22 | extern struct dma_map_ops *dma_ops; |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 23 | |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 24 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) |
Glauber Costa | c786df0 | 2008-03-25 18:36:37 -0300 | [diff] [blame] | 25 | { |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 26 | #ifdef CONFIG_X86_32 |
| 27 | return dma_ops; |
| 28 | #else |
| 29 | if (unlikely(!dev) || !dev->archdata.dma_ops) |
| 30 | return dma_ops; |
| 31 | else |
| 32 | return dev->archdata.dma_ops; |
Jeremy Fitzhardinge | cfb80c9 | 2008-12-16 12:17:36 -0800 | [diff] [blame] | 33 | #endif |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 34 | } |
| 35 | |
FUJITA Tomonori | 7c095e4 | 2009-06-17 16:28:12 -0700 | [diff] [blame^] | 36 | #include <asm-generic/dma-mapping-common.h> |
| 37 | |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 38 | /* Make sure we keep the same behaviour */ |
| 39 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
| 40 | { |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 41 | struct dma_map_ops *ops = get_dma_ops(dev); |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 42 | if (ops->mapping_error) |
| 43 | return ops->mapping_error(dev, dma_addr); |
Glauber Costa | c786df0 | 2008-03-25 18:36:37 -0300 | [diff] [blame] | 44 | |
Thomas Bogendoerfer | 7b1dedc | 2008-11-29 13:46:27 +0100 | [diff] [blame] | 45 | return (dma_addr == bad_dma_address); |
Glauber Costa | c786df0 | 2008-03-25 18:36:37 -0300 | [diff] [blame] | 46 | } |
| 47 | |
Glauber Costa | 8d396de | 2008-03-25 18:36:31 -0300 | [diff] [blame] | 48 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) |
| 49 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 50 | #define dma_is_consistent(d, h) (1) |
Glauber Costa | 8d396de | 2008-03-25 18:36:31 -0300 | [diff] [blame] | 51 | |
Glauber Costa | 802c1f6 | 2008-03-25 18:36:34 -0300 | [diff] [blame] | 52 | extern int dma_supported(struct device *hwdev, u64 mask); |
| 53 | extern int dma_set_mask(struct device *dev, u64 mask); |
| 54 | |
FUJITA Tomonori | 9f6ac57 | 2008-09-24 20:48:35 +0900 | [diff] [blame] | 55 | extern void *dma_generic_alloc_coherent(struct device *dev, size_t size, |
| 56 | dma_addr_t *dma_addr, gfp_t flag); |
| 57 | |
Glauber Costa | 3cb6a91 | 2008-03-25 18:36:33 -0300 | [diff] [blame] | 58 | static inline void |
| 59 | dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
| 60 | enum dma_data_direction dir) |
| 61 | { |
| 62 | flush_write_buffers(); |
| 63 | } |
Glauber Costa | ae17a63b | 2008-03-25 18:36:38 -0300 | [diff] [blame] | 64 | |
Glauber Costa | b7107a3 | 2008-03-25 18:36:39 -0300 | [diff] [blame] | 65 | static inline int dma_get_cache_alignment(void) |
| 66 | { |
| 67 | /* no easy way to get cache size on all x86, so return the |
| 68 | * maximum possible, to be safe */ |
| 69 | return boot_cpu_data.x86_clflush_size; |
| 70 | } |
| 71 | |
FUJITA Tomonori | 823e7e8 | 2008-09-08 18:10:13 +0900 | [diff] [blame] | 72 | static inline unsigned long dma_alloc_coherent_mask(struct device *dev, |
| 73 | gfp_t gfp) |
| 74 | { |
| 75 | unsigned long dma_mask = 0; |
Glauber Costa | b7107a3 | 2008-03-25 18:36:39 -0300 | [diff] [blame] | 76 | |
FUJITA Tomonori | 823e7e8 | 2008-09-08 18:10:13 +0900 | [diff] [blame] | 77 | dma_mask = dev->coherent_dma_mask; |
| 78 | if (!dma_mask) |
Yang Hongyang | 2f4f27d | 2009-04-06 19:01:18 -0700 | [diff] [blame] | 79 | dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32); |
FUJITA Tomonori | 823e7e8 | 2008-09-08 18:10:13 +0900 | [diff] [blame] | 80 | |
| 81 | return dma_mask; |
| 82 | } |
| 83 | |
| 84 | static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp) |
| 85 | { |
| 86 | unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); |
| 87 | |
Yang Hongyang | 2f4f27d | 2009-04-06 19:01:18 -0700 | [diff] [blame] | 88 | if (dma_mask <= DMA_BIT_MASK(24)) |
FUJITA Tomonori | 75bebb7 | 2008-10-23 20:46:55 +0900 | [diff] [blame] | 89 | gfp |= GFP_DMA; |
| 90 | #ifdef CONFIG_X86_64 |
Yang Hongyang | 284901a | 2009-04-06 19:01:15 -0700 | [diff] [blame] | 91 | if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) |
FUJITA Tomonori | 823e7e8 | 2008-09-08 18:10:13 +0900 | [diff] [blame] | 92 | gfp |= GFP_DMA32; |
| 93 | #endif |
| 94 | return gfp; |
| 95 | } |
| 96 | |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 97 | static inline void * |
| 98 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| 99 | gfp_t gfp) |
| 100 | { |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 101 | struct dma_map_ops *ops = get_dma_ops(dev); |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 102 | void *memory; |
Glauber Costa | ae17a63b | 2008-03-25 18:36:38 -0300 | [diff] [blame] | 103 | |
FUJITA Tomonori | 8a53ad6 | 2008-09-08 18:10:12 +0900 | [diff] [blame] | 104 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 105 | |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 106 | if (dma_alloc_from_coherent(dev, size, dma_handle, &memory)) |
| 107 | return memory; |
| 108 | |
| 109 | if (!dev) { |
| 110 | dev = &x86_dma_fallback_dev; |
| 111 | gfp |= GFP_DMA; |
| 112 | } |
| 113 | |
FUJITA Tomonori | 9821626 | 2008-09-10 00:49:48 +0900 | [diff] [blame] | 114 | if (!is_device_dma_capable(dev)) |
FUJITA Tomonori | de9f521 | 2008-09-08 18:10:11 +0900 | [diff] [blame] | 115 | return NULL; |
| 116 | |
FUJITA Tomonori | 823e7e8 | 2008-09-08 18:10:13 +0900 | [diff] [blame] | 117 | if (!ops->alloc_coherent) |
| 118 | return NULL; |
| 119 | |
Joerg Roedel | 2118d0c | 2009-01-09 15:13:15 +0100 | [diff] [blame] | 120 | memory = ops->alloc_coherent(dev, size, dma_handle, |
| 121 | dma_alloc_coherent_gfp_flags(dev, gfp)); |
| 122 | debug_dma_alloc_coherent(dev, size, *dma_handle, memory); |
| 123 | |
| 124 | return memory; |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | static inline void dma_free_coherent(struct device *dev, size_t size, |
| 128 | void *vaddr, dma_addr_t bus) |
| 129 | { |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 130 | struct dma_map_ops *ops = get_dma_ops(dev); |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 131 | |
| 132 | WARN_ON(irqs_disabled()); /* for portability */ |
| 133 | |
| 134 | if (dma_release_from_coherent(dev, get_order(size), vaddr)) |
| 135 | return; |
| 136 | |
Joerg Roedel | 2118d0c | 2009-01-09 15:13:15 +0100 | [diff] [blame] | 137 | debug_dma_free_coherent(dev, size, vaddr, bus); |
Joerg Roedel | 6c505ce | 2008-08-19 16:32:45 +0200 | [diff] [blame] | 138 | if (ops->free_coherent) |
| 139 | ops->free_coherent(dev, size, vaddr, bus); |
| 140 | } |
| 141 | |
Glauber Costa | 6f53663 | 2008-03-25 18:36:20 -0300 | [diff] [blame] | 142 | #endif |