1 #ifndef _ASM_X86_DMA_MAPPING_H
2 #define _ASM_X86_DMA_MAPPING_H
5 * IOMMU interface. See Documentation/PCI/PCI-DMA-mapping.txt and
6 * Documentation/DMA-API.txt for documentation.
9 #include <linux/kmemcheck.h>
10 #include <linux/scatterlist.h>
11 #include <linux/dma-debug.h>
12 #include <linux/dma-attrs.h>
14 #include <asm/swiotlb.h>
15 #include <asm-generic/dma-coherent.h>
17 extern dma_addr_t bad_dma_address;
18 extern int iommu_merge;
19 extern struct device x86_dma_fallback_dev;
20 extern int panic_on_overflow;
22 extern struct dma_map_ops *dma_ops;
24 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
29 if (unlikely(!dev) || !dev->archdata.dma_ops)
32 return dev->archdata.dma_ops;
36 #include <asm-generic/dma-mapping-common.h>
38 /* Make sure we keep the same behaviour */
39 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
41 struct dma_map_ops *ops = get_dma_ops(dev);
42 if (ops->mapping_error)
43 return ops->mapping_error(dev, dma_addr);
45 return (dma_addr == bad_dma_address);
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)
50 #define dma_is_consistent(d, h) (1)
52 extern int dma_supported(struct device *hwdev, u64 mask);
53 extern int dma_set_mask(struct device *dev, u64 mask);
55 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
56 dma_addr_t *dma_addr, gfp_t flag);
58 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
63 return addr + size <= *dev->dma_mask;
67 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
68 enum dma_data_direction dir)
70 flush_write_buffers();
73 static inline int dma_get_cache_alignment(void)
75 /* no easy way to get cache size on all x86, so return the
76 * maximum possible, to be safe */
77 return boot_cpu_data.x86_clflush_size;
80 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
83 unsigned long dma_mask = 0;
85 dma_mask = dev->coherent_dma_mask;
87 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
92 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
94 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
96 if (dma_mask <= DMA_BIT_MASK(24))
99 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
106 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
109 struct dma_map_ops *ops = get_dma_ops(dev);
112 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
114 if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
118 dev = &x86_dma_fallback_dev;
122 if (!is_device_dma_capable(dev))
125 if (!ops->alloc_coherent)
128 memory = ops->alloc_coherent(dev, size, dma_handle,
129 dma_alloc_coherent_gfp_flags(dev, gfp));
130 debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
135 static inline void dma_free_coherent(struct device *dev, size_t size,
136 void *vaddr, dma_addr_t bus)
138 struct dma_map_ops *ops = get_dma_ops(dev);
140 WARN_ON(irqs_disabled()); /* for portability */
142 if (dma_release_from_coherent(dev, get_order(size), vaddr))
145 debug_dma_free_coherent(dev, size, vaddr, bus);
146 if (ops->free_coherent)
147 ops->free_coherent(dev, size, vaddr, bus);