LCOV - code coverage report
Current view: top level - include/linux - dma-attrs.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       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_MAX,
      17             : };
      18             : 
      19             : #define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX)
      20             : 
      21             : /**
      22             :  * struct dma_attrs - an opaque container for DMA attributes
      23             :  * @flags - bitmask representing a collection of enum dma_attr
      24             :  */
      25             : struct dma_attrs {
      26             :         unsigned long flags[__DMA_ATTRS_LONGS];
      27             : };
      28             : 
      29             : #define DEFINE_DMA_ATTRS(x)                                     \
      30             :         struct dma_attrs x = {                                  \
      31             :                 .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 },   \
      32             :         }
      33             : 
      34             : static inline void init_dma_attrs(struct dma_attrs *attrs)
      35             : {
      36             :         bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS);
      37             : }
      38             : 
      39             : #ifdef CONFIG_HAVE_DMA_ATTRS
      40             : /**
      41             :  * dma_set_attr - set a specific attribute
      42             :  * @attr: attribute to set
      43             :  * @attrs: struct dma_attrs (may be NULL)
      44             :  */
      45             : static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
      46             : {
      47             :         if (attrs == NULL)
      48             :                 return;
      49             :         BUG_ON(attr >= DMA_ATTR_MAX);
      50             :         __set_bit(attr, attrs->flags);
      51             : }
      52             : 
      53             : /**
      54             :  * dma_get_attr - check for a specific attribute
      55             :  * @attr: attribute to set
      56             :  * @attrs: struct dma_attrs (may be NULL)
      57             :  */
      58             : static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
      59             : {
      60             :         if (attrs == NULL)
      61             :                 return 0;
      62             :         BUG_ON(attr >= DMA_ATTR_MAX);
      63             :         return test_bit(attr, attrs->flags);
      64             : }
      65           1 : #else /* !CONFIG_HAVE_DMA_ATTRS */
      66             : static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
      67             : {
      68             : }
      69             : 
      70             : static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
      71             : {
      72             :         return 0;
      73             : }
      74             : #endif /* CONFIG_HAVE_DMA_ATTRS */
      75             : #endif /* _DMA_ATTR_H */

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