linux-4.4.1/dma_map_ops の履歴(No.1)

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linux-4.4.1/dma_map_ops へ行く。
- 1 (2016-02-22 (月) 10:48:49)

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パス: linux-4.4.1/include/linux/dma-mapping.h

FIXME: これは何？
- 説明

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実装†

/*
 * A dma_addr_t can hold any valid DMA or bus address for the platform.
 * It can be given to a device to use as a DMA source or target.  A CPU cannot
 * reference a dma_addr_t directly because there may be translation between
 * its physical address space and the bus address space.
 */
struct dma_map_ops {
        void* (*alloc)(struct device *dev, size_t size,
                                dma_addr_t *dma_handle, gfp_t gfp,
                                struct dma_attrs *attrs);

        void (*free)(struct device *dev, size_t size,
                              void *vaddr, dma_addr_t dma_handle,
                              struct dma_attrs *attrs);
        int (*mmap)(struct device *, struct vm_area_struct *,
                          void *, dma_addr_t, size_t, struct dma_attrs *attrs);

- linux-4.4.1/vm_area_struct

        int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
                           dma_addr_t, size_t, struct dma_attrs *attrs);

- linux-4.4.1/sg_table

        dma_addr_t (*map_page)(struct device *dev, struct page *page,
                               unsigned long offset, size_t size,
                               enum dma_data_direction dir,
                               struct dma_attrs *attrs);

- linux-4.4.1/page
- linux-4.4.1/dma_data_direction

        void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
                           size_t size, enum dma_data_direction dir,
                           struct dma_attrs *attrs);
        /*
         * map_sg returns 0 on error and a value > 0 on success.
         * It should never return a value < 0.
         */
        int (*map_sg)(struct device *dev, struct scatterlist *sg,
                      int nents, enum dma_data_direction dir,
                      struct dma_attrs *attrs);

- linux-4.4.1/scatterlist

        void (*unmap_sg)(struct device *dev,
                         struct scatterlist *sg, int nents,
                         enum dma_data_direction dir,
                         struct dma_attrs *attrs);
        void (*sync_single_for_cpu)(struct device *dev,
                                    dma_addr_t dma_handle, size_t size,
                                    enum dma_data_direction dir);
        void (*sync_single_for_device)(struct device *dev,
                                       dma_addr_t dma_handle, size_t size,
                                       enum dma_data_direction dir);
        void (*sync_sg_for_cpu)(struct device *dev,
                                struct scatterlist *sg, int nents,
                                enum dma_data_direction dir);
        void (*sync_sg_for_device)(struct device *dev,
                                   struct scatterlist *sg, int nents,
                                   enum dma_data_direction dir);
        int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
        int (*dma_supported)(struct device *dev, u64 mask);
        int (*set_dma_mask)(struct device *dev, u64 mask);
#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK

- linux-4.4.1/ARCH_HAS_DMA_GET_REQUIRED_MASK

        u64 (*get_required_mask)(struct device *dev);
#endif
        int is_phys;
};

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linux-4.4.1/dma_map_ops の履歴(No.1)

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