dma_is_direct

函数名称：dma_is_direct

函数原型：static inline bool dma_is_direct(const struct dma_map_ops *ops)

返回类型：bool

参数：

类型	参数	名称
const struct dma_map_ops *	ops

193

返回:此条件成立可能性大(为编译器优化)(!ops)

**调用者**
名称	描述
dma_get_sgtable_attrs	The whole dma_get_sgtable() idea is fundamentally unsafe - it seems* that the intention is to allow exporting memory allocated via the* coherent DMA APIs through the dma_buf API, which only accepts a* scattertable. This presents a couple of problems:* 1
dma_can_mmap	dma_can_mmap - check if a given device supports dma_mmap_*@dev: device to check Returns %true if @dev supports dma_mmap_coherent() and dma_mmap_attrs() to* map DMA allocations to userspace.
dma_mmap_attrs	dma_mmap_attrs - map a coherent DMA allocation into user space@dev: valid struct device pointer, or NULL for ISA and EISA-like devices@vma: vm_area_struct describing requested user mapping*@cpu_addr: kernel CPU-view address returned from
dma_get_required_mask
dma_alloc_attrs
dma_free_attrs
dma_supported
dma_cache_sync
dma_max_mapping_size
dma_map_page_attrs
dma_unmap_page_attrs
dma_map_sg_attrs	dma_maps_sg_attrs returns 0 on error and > 0 on success.* It should never return a value < 0.
dma_unmap_sg_attrs
dma_map_resource
dma_unmap_resource
dma_sync_single_for_cpu
dma_sync_single_for_device
dma_sync_sg_for_cpu
dma_sync_sg_for_device

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