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
10
11
12
13enum 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
28
29
30struct 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
39static 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
47
48
49
50static 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
60
61
62
63static 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
71static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
72{
73}
74
75static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
76{
77 return 0;
78}
79#endif
80#endif
81