dma-mapping.h 2.53 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_DMA_MAPPING_H
#define _ASM_X86_DMA_MAPPING_H
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/*
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 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
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 * Documentation/DMA-API.txt for documentation.
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 */

#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <asm/io.h>
#include <asm/swiotlb.h>
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#include <linux/dma-contiguous.h>
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#include <linux/mem_encrypt.h>
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#ifdef CONFIG_ISA
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
#else
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
#endif

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extern int iommu_merge;
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extern struct device x86_dma_fallback_dev;
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extern int panic_on_overflow;
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extern const struct dma_map_ops *dma_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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	return dma_ops;
}

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bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
#define arch_dma_alloc_attrs arch_dma_alloc_attrs

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extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
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					dma_addr_t *dma_addr, gfp_t flag,
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					unsigned long attrs);
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extern void dma_generic_free_coherent(struct device *dev, size_t size,
				      void *vaddr, dma_addr_t dma_addr,
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				      unsigned long attrs);
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#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

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

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

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

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
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	return __sme_clr(daddr);
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}
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#endif /* CONFIG_X86_DMA_REMAP */
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static inline void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
	enum dma_data_direction dir)
{
	flush_write_buffers();
}
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static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
						    gfp_t gfp)
{
	unsigned long dma_mask = 0;
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	dma_mask = dev->coherent_dma_mask;
	if (!dma_mask)
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		dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
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	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);

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

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#endif