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awilliam@xenbuild.aw
b63e1dbb4d
Do not define dma_supported to platform_dma_supported when building the Xen kernel. This happend to work for DIG builds because the swiotlb.c version of dma_supported compiles to identical code as arch/i386/kernel/pci-dma-xen.c so the linker didn't complain. Signed-off-by: Jes Sorensen <jes@sgi.com>
138 lines
4.7 KiB
C
138 lines
4.7 KiB
C
#ifndef _ASM_IA64_DMA_MAPPING_H
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#define _ASM_IA64_DMA_MAPPING_H
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/*
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* Copyright (C) 2003-2004 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/config.h>
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#include <asm/machvec.h>
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#ifdef CONFIG_XEN
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/* Needed for arch/i386/kernel/swiotlb.c and arch/i386/kernel/pci-dma-xen.c */
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#include <asm/hypervisor.h>
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/* Needed for arch/i386/kernel/swiotlb.c */
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#include <asm-i386/mach-xen/asm/swiotlb.h>
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#endif
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#ifndef CONFIG_XEN
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#define dma_alloc_coherent platform_dma_alloc_coherent
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#define dma_alloc_noncoherent platform_dma_alloc_coherent /* coherent mem. is cheap */
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#define dma_free_coherent platform_dma_free_coherent
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#define dma_free_noncoherent platform_dma_free_coherent
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#define dma_map_single platform_dma_map_single
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#define dma_map_sg platform_dma_map_sg
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#define dma_unmap_single platform_dma_unmap_single
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#define dma_unmap_sg platform_dma_unmap_sg
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#define dma_sync_single_for_cpu platform_dma_sync_single_for_cpu
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#define dma_sync_sg_for_cpu platform_dma_sync_sg_for_cpu
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#define dma_sync_single_for_device platform_dma_sync_single_for_device
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#define dma_sync_sg_for_device platform_dma_sync_sg_for_device
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#define dma_mapping_error platform_dma_mapping_error
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#else
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int dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction);
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void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction);
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int dma_supported(struct device *dev, u64 mask);
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle);
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dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction);
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void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction);
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction);
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void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
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size_t size,
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enum dma_data_direction direction);
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int dma_mapping_error(dma_addr_t dma_addr);
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#define flush_write_buffers() do { } while (0)
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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if (swiotlb)
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swiotlb_sync_sg_for_cpu(dev,sg,nelems,direction);
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flush_write_buffers();
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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if (swiotlb)
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swiotlb_sync_sg_for_device(dev,sg,nelems,direction);
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flush_write_buffers();
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}
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#endif
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#define dma_map_page(dev, pg, off, size, dir) \
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dma_map_single(dev, page_address(pg) + (off), (size), (dir))
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#define dma_unmap_page(dev, dma_addr, size, dir) \
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dma_unmap_single(dev, dma_addr, size, dir)
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/*
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* Rest of this file is part of the "Advanced DMA API". Use at your own risk.
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* See Documentation/DMA-API.txt for details.
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*/
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#define dma_sync_single_range_for_cpu(dev, dma_handle, offset, size, dir) \
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dma_sync_single_for_cpu(dev, dma_handle, size, dir)
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#define dma_sync_single_range_for_device(dev, dma_handle, offset, size, dir) \
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dma_sync_single_for_device(dev, dma_handle, size, dir)
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#ifndef CONFIG_XEN
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#define dma_supported platform_dma_supported
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#endif
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static inline int
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dma_set_mask (struct device *dev, u64 mask)
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{
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if (!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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extern int dma_get_cache_alignment(void);
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static inline void
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dma_cache_sync (void *vaddr, size_t size, enum dma_data_direction dir)
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{
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/*
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* IA-64 is cache-coherent, so this is mostly a no-op. However, we do need to
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* ensure that dma_cache_sync() enforces order, hence the mb().
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*/
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mb();
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}
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#define dma_is_consistent(dma_handle) (1) /* all we do is coherent memory... */
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#ifdef CONFIG_XEN
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/* arch/i386/kernel/swiotlb.o requires */
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void contiguous_bitmap_init(unsigned long end_pfn);
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static inline int
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address_needs_mapping(struct device *hwdev, dma_addr_t addr)
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{
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dma_addr_t mask = DMA_64BIT_MASK;
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/* If the device has a mask, use it, otherwise default to 64 bits */
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if (hwdev && hwdev->dma_mask)
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mask = *hwdev->dma_mask;
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return (addr & ~mask) != 0;
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}
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static inline int
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range_straddles_page_boundary(void *p, size_t size)
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{
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extern unsigned long *contiguous_bitmap;
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return (((((unsigned long)p & ~PAGE_MASK) + size) > PAGE_SIZE) &&
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!test_bit(__pa(p) >> PAGE_SHIFT, contiguous_bitmap));
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}
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#endif
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#endif /* _ASM_IA64_DMA_MAPPING_H */
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