forked from Minki/linux
815dd18788
Introduce a new architecture-specific get_arch_dma_ops() function that takes a struct bus_type * argument. Add get_dma_ops() in <linux/dma-mapping.h>. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Russell King <linux@armlinux.org.uk> Cc: x86@kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com>
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
#ifndef _ASM_X86_DMA_MAPPING_H
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#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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*/
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#include <linux/kmemcheck.h>
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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>
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#include <asm/swiotlb.h>
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#include <linux/dma-contiguous.h>
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#ifdef CONFIG_ISA
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
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#else
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# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
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#endif
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#define DMA_ERROR_CODE 0
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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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}
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bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
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#define arch_dma_alloc_attrs arch_dma_alloc_attrs
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#define HAVE_ARCH_DMA_SUPPORTED 1
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extern int dma_supported(struct device *hwdev, u64 mask);
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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,
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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 */
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extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
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extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
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extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
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#else
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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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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{
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return paddr;
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return daddr;
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}
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#endif /* CONFIG_X86_DMA_REMAP */
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static inline void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction dir)
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{
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flush_write_buffers();
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}
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static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
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gfp_t gfp)
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{
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unsigned long dma_mask = 0;
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dma_mask = dev->coherent_dma_mask;
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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;
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}
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static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
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{
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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;
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#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;
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#endif
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return gfp;
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}
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#endif
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