dma-mapping.h

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#ifndef _ASM_X86_DMA_MAPPING_H
#define _ASM_X86_DMA_MAPPING_H

/*
 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
 * Documentation/DMA-API.txt for documentation.
 */

#include <linux/kmemcheck.h>
#include <linux/scatterlist.h>
#include <linux/dma-debug.h>
#include <linux/dma-attrs.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
#include <asm-generic/dma-coherent.h>
#include <linux/dma-contiguous.h>

#ifdef CONFIG_ISA
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
#else
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
#endif

#define DMA_ERROR_CODE  0

extern int iommu_merge;
extern struct device x86_dma_fallback_dev;
extern int panic_on_overflow;

extern struct dma_map_ops *dma_ops;

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
#ifndef CONFIG_X86_DEV_DMA_OPS
    return dma_ops;
#else
    if (unlikely(!dev) || !dev->archdata.dma_ops)
        return dma_ops;
    else
        return dev->archdata.dma_ops;
#endif
}

#include <asm-generic/dma-mapping-common.h>

/* Make sure we keep the same behaviour */
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
    struct dma_map_ops *ops = get_dma_ops(dev);
    if (ops->mapping_error)
        return ops->mapping_error(dev, dma_addr);

    return (dma_addr == DMA_ERROR_CODE);
}

#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)

extern int dma_supported(struct device *hwdev, u64 mask);
extern int dma_set_mask(struct device *dev, u64 mask);

extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
                    dma_addr_t *dma_addr, gfp_t flag,
                    struct dma_attrs *attrs);

extern void dma_generic_free_coherent(struct device *dev, size_t size,
                      void *vaddr, dma_addr_t dma_addr,
                      struct dma_attrs *attrs);

#ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
#else

static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
    if (!dev->dma_mask)
        return 0;

    return addr + size - 1 <= *dev->dma_mask;
}

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
    return paddr;
}

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
    return daddr;
}
#endif /* CONFIG_X86_DMA_REMAP */

static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
    enum dma_data_direction dir)
{
    flush_write_buffers();
}

static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
                            gfp_t gfp)
{
    unsigned long dma_mask = 0;

    dma_mask = dev->coherent_dma_mask;
    if (!dma_mask)
        dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);

    return dma_mask;
}

static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
{
    unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);

    if (dma_mask <= DMA_BIT_MASK(24))
        gfp |= GFP_DMA;
#ifdef CONFIG_X86_64
    if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
        gfp |= GFP_DMA32;
#endif
       return gfp;
}

#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)

static inline void *
dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
        gfp_t gfp, struct dma_attrs *attrs)
{
    struct dma_map_ops *ops = get_dma_ops(dev);
    void *memory;

    gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);

    if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
        return memory;

    if (!dev)
        dev = &x86_dma_fallback_dev;

    if (!is_device_dma_capable(dev))
        return NULL;

    if (!ops->alloc)
        return NULL;

    memory = ops->alloc(dev, size, dma_handle,
                dma_alloc_coherent_gfp_flags(dev, gfp), attrs);
    debug_dma_alloc_coherent(dev, size, *dma_handle, memory);

    return memory;
}

#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)

static inline void dma_free_attrs(struct device *dev, size_t size,
                  void *vaddr, dma_addr_t bus,
                  struct dma_attrs *attrs)
{
    struct dma_map_ops *ops = get_dma_ops(dev);

    WARN_ON(irqs_disabled());       /* for portability */

    if (dma_release_from_coherent(dev, get_order(size), vaddr))
        return;

    debug_dma_free_coherent(dev, size, vaddr, bus);
    if (ops->free)
        ops->free(dev, size, vaddr, bus, attrs);
}

#endif