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Current Path : /lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/

Linux 43-225-53-84.webhostbox.net 3.10.0-1160.92.1.el7.x86_64 #1 SMP Tue Jun 20 11:48:01 UTC 2023 x86_64

Current File : //lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/dma-attrs.h

#ifndef _DMA_ATTR_H
#define _DMA_ATTR_H

#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/bug.h>

/**
 * an enum dma_attr represents an attribute associated with a DMA
 * mapping. The semantics of each attribute should be defined in
 * Documentation/DMA-attributes.txt.
 */
enum dma_attr {
	DMA_ATTR_WRITE_BARRIER,
	DMA_ATTR_WEAK_ORDERING,
	DMA_ATTR_WRITE_COMBINE,
	DMA_ATTR_NON_CONSISTENT,
	DMA_ATTR_NO_KERNEL_MAPPING,
	DMA_ATTR_SKIP_CPU_SYNC,
	DMA_ATTR_FORCE_CONTIGUOUS,
	DMA_ATTR_MAX,
};

#define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX)

/**
 * struct dma_attrs - an opaque container for DMA attributes
 * @flags - bitmask representing a collection of enum dma_attr
 */
struct dma_attrs {
	unsigned long flags[__DMA_ATTRS_LONGS];
};

#define DEFINE_DMA_ATTRS(x) 					\
	struct dma_attrs x = {					\
		.flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 },	\
	}

static inline void init_dma_attrs(struct dma_attrs *attrs)
{
	bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS);
}

/**
 * dma_set_attr - set a specific attribute
 * @attr: attribute to set
 * @attrs: struct dma_attrs (may be NULL)
 */
static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
{
	if (attrs == NULL)
		return;
	BUG_ON(attr >= DMA_ATTR_MAX);
	__set_bit(attr, attrs->flags);
}

/**
 * dma_get_attr - check for a specific attribute
 * @attr: attribute to set
 * @attrs: struct dma_attrs (may be NULL)
 */
static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
{
	if (attrs == NULL)
		return 0;
	BUG_ON(attr >= DMA_ATTR_MAX);
	return test_bit(attr, attrs->flags);
}

#endif /* _DMA_ATTR_H */

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