forked from KolibriOS/kolibrios
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
#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 <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
|
|
}
|
|
|
|
bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
|
|
#define arch_dma_alloc_attrs arch_dma_alloc_attrs
|
|
|
|
#define HAVE_ARCH_DMA_SUPPORTED 1
|
|
extern int dma_supported(struct device *hwdev, u64 mask);
|
|
|
|
#include <asm-generic/dma-mapping-common.h>
|
|
|
|
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;
|
|
}
|
|
|
|
#endif
|