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,
19 #define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX)
22 * struct dma_attrs - an opaque container for DMA attributes
23 * @flags - bitmask representing a collection of enum dma_attr
26 unsigned long flags[__DMA_ATTRS_LONGS];
29 #define DEFINE_DMA_ATTRS(x) \
30 struct dma_attrs x = { \
31 .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 }, \
34 static inline void init_dma_attrs(struct dma_attrs *attrs)
36 bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS);
39 #ifdef CONFIG_HAVE_DMA_ATTRS
41 * dma_set_attr - set a specific attribute
42 * @attr: attribute to set
43 * @attrs: struct dma_attrs (may be NULL)
45 static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
49 BUG_ON(attr >= DMA_ATTR_MAX);
50 __set_bit(attr, attrs->flags);
54 * dma_get_attr - check for a specific attribute
55 * @attr: attribute to set
56 * @attrs: struct dma_attrs (may be NULL)
58 static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
62 BUG_ON(attr >= DMA_ATTR_MAX);
63 return test_bit(attr, attrs->flags);
65 #else /* !CONFIG_HAVE_DMA_ATTRS */
66 static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
70 static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
74 #endif /* CONFIG_HAVE_DMA_ATTRS */
75 #endif /* _DMA_ATTR_H */