1 #ifndef _ASM_X86_DMA_MAPPING_H
2 #define _ASM_X86_DMA_MAPPING_H
5 * IOMMU interface. See Documentation/DMA-API-HOWTO.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 <linux/dma-contiguous.h>
18 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
20 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
23 #define DMA_ERROR_CODE 0
25 extern int iommu_merge
;
26 extern struct device x86_dma_fallback_dev
;
27 extern int panic_on_overflow
;
29 extern struct dma_map_ops
*dma_ops
;
31 static inline struct dma_map_ops
*get_dma_ops(struct device
*dev
)
33 #ifndef CONFIG_X86_DEV_DMA_OPS
36 if (unlikely(!dev
) || !dev
->archdata
.dma_ops
)
39 return dev
->archdata
.dma_ops
;
43 bool arch_dma_alloc_attrs(struct device
**dev
, gfp_t
*gfp
);
44 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
46 #define HAVE_ARCH_DMA_SUPPORTED 1
47 extern int dma_supported(struct device
*hwdev
, u64 mask
);
49 extern void *dma_generic_alloc_coherent(struct device
*dev
, size_t size
,
50 dma_addr_t
*dma_addr
, gfp_t flag
,
51 struct dma_attrs
*attrs
);
53 extern void dma_generic_free_coherent(struct device
*dev
, size_t size
,
54 void *vaddr
, dma_addr_t dma_addr
,
55 struct dma_attrs
*attrs
);
57 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
58 extern bool dma_capable(struct device
*dev
, dma_addr_t addr
, size_t size
);
59 extern dma_addr_t
phys_to_dma(struct device
*dev
, phys_addr_t paddr
);
60 extern phys_addr_t
dma_to_phys(struct device
*dev
, dma_addr_t daddr
);
63 static inline bool dma_capable(struct device
*dev
, dma_addr_t addr
, size_t size
)
68 return addr
+ size
- 1 <= *dev
->dma_mask
;
71 static inline dma_addr_t
phys_to_dma(struct device
*dev
, phys_addr_t paddr
)
76 static inline phys_addr_t
dma_to_phys(struct device
*dev
, dma_addr_t daddr
)
80 #endif /* CONFIG_X86_DMA_REMAP */
83 dma_cache_sync(struct device
*dev
, void *vaddr
, size_t size
,
84 enum dma_data_direction dir
)
86 flush_write_buffers();
89 static inline unsigned long dma_alloc_coherent_mask(struct device
*dev
,
92 unsigned long dma_mask
= 0;
94 dma_mask
= dev
->coherent_dma_mask
;
96 dma_mask
= (gfp
& GFP_DMA
) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
101 static inline gfp_t
dma_alloc_coherent_gfp_flags(struct device
*dev
, gfp_t gfp
)
103 unsigned long dma_mask
= dma_alloc_coherent_mask(dev
, gfp
);
105 if (dma_mask
<= DMA_BIT_MASK(24))
108 if (dma_mask
<= DMA_BIT_MASK(32) && !(gfp
& GFP_DMA
))