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1 | #ifndef _DMA_ATTR_H |
2 | #define _DMA_ATTR_H |
3 | |
4 | #include <linux/bitmap.h> |
5 | #include <linux/bitops.h> |
6 | #include <linux/bug.h> |
7 | |
8 | /** |
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. |
12 | */ |
13 | enum dma_attr { |
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, |
21 | DMA_ATTR_MAX, |
22 | }; |
23 | |
24 | #define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX) |
25 | |
26 | /** |
27 | * struct dma_attrs - an opaque container for DMA attributes |
28 | * @flags - bitmask representing a collection of enum dma_attr |
29 | */ |
30 | struct dma_attrs { |
31 | unsigned long flags[__DMA_ATTRS_LONGS]; |
32 | }; |
33 | |
34 | #define DEFINE_DMA_ATTRS(x) \ |
35 | struct dma_attrs x = { \ |
36 | .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 }, \ |
37 | } |
38 | |
39 | static inline void init_dma_attrs(struct dma_attrs *attrs) |
40 | { |
41 | bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS); |
42 | } |
43 | |
44 | #ifdef CONFIG_HAVE_DMA_ATTRS |
45 | /** |
46 | * dma_set_attr - set a specific attribute |
47 | * @attr: attribute to set |
48 | * @attrs: struct dma_attrs (may be NULL) |
49 | */ |
50 | static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs) |
51 | { |
52 | if (attrs == NULL) |
53 | return; |
54 | BUG_ON(attr >= DMA_ATTR_MAX); |
55 | __set_bit(attr, attrs->flags); |
56 | } |
57 | |
58 | /** |
59 | * dma_get_attr - check for a specific attribute |
60 | * @attr: attribute to set |
61 | * @attrs: struct dma_attrs (may be NULL) |
62 | */ |
63 | static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs) |
64 | { |
65 | if (attrs == NULL) |
66 | return 0; |
67 | BUG_ON(attr >= DMA_ATTR_MAX); |
68 | return test_bit(attr, attrs->flags); |
69 | } |
70 | #else /* !CONFIG_HAVE_DMA_ATTRS */ |
71 | static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs) |
72 | { |
73 | } |
74 | |
75 | static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs) |
76 | { |
77 | return 0; |
78 | } |
79 | #endif /* CONFIG_HAVE_DMA_ATTRS */ |
80 | #endif /* _DMA_ATTR_H */ |
81 |
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