4 #include <linux/bitmap.h>
5 #include <linux/bitops.h>
9 * an enum dma_attr represents an attribute associated with a DMA
10 * mapping. The semantics of each attribute should be defined in
11 * Documentation/DMA-attributes.txt.
14 DMA_ATTR_WRITE_BARRIER
,
15 DMA_ATTR_WEAK_ORDERING
,
16 DMA_ATTR_WRITE_COMBINE
,
17 DMA_ATTR_NON_CONSISTENT
,
18 DMA_ATTR_NO_KERNEL_MAPPING
,
19 DMA_ATTR_SKIP_CPU_SYNC
,
20 DMA_ATTR_FORCE_CONTIGUOUS
,
24 #define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX)
27 * struct dma_attrs - an opaque container for DMA attributes
28 * @flags - bitmask representing a collection of enum dma_attr
31 unsigned long flags
[__DMA_ATTRS_LONGS
];
34 #define DEFINE_DMA_ATTRS(x) \
35 struct dma_attrs x = { \
36 .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 }, \
39 static inline void init_dma_attrs(struct dma_attrs
*attrs
)
41 bitmap_zero(attrs
->flags
, __DMA_ATTRS_LONGS
);
45 * dma_set_attr - set a specific attribute
46 * @attr: attribute to set
47 * @attrs: struct dma_attrs (may be NULL)
49 static inline void dma_set_attr(enum dma_attr attr
, struct dma_attrs
*attrs
)
53 BUG_ON(attr
>= DMA_ATTR_MAX
);
54 __set_bit(attr
, attrs
->flags
);
58 * dma_get_attr - check for a specific attribute
59 * @attr: attribute to set
60 * @attrs: struct dma_attrs (may be NULL)
62 static inline int dma_get_attr(enum dma_attr attr
, struct dma_attrs
*attrs
)
66 BUG_ON(attr
>= DMA_ATTR_MAX
);
67 return test_bit(attr
, attrs
->flags
);
70 #endif /* _DMA_ATTR_H */