dma_pgprot

函数名称：Return the page attributes used for mapping dma_alloc_* memory, either in* kernel space if remapping is needed, or to userspace through dma_mmap_*.

函数原型：pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs)

返回类型：pgprot_t

参数：

类型	参数	名称
struct device *	dev
pgprot_t	prot
unsigned long	attrs

157

如果dev_is_dma_coherent(dev)或IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_DMA_NONCOHERENT_CACHE_SYNC)且attrs按位与DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either* consistent or non-consistent memory as it sees fit.则返回:prot

165

返回:Page protection so that devices that can't snoop CPU caches can use the* memory coherently. We default to pgprot_noncached which is usually used* for ioremap as a safe bet, but architectures can override this with less* strict semantics if possible.(prot)

**调用者**
名称	描述
dma_common_mmap	Create userspace mapping for the DMA-coherent memory.
dma_direct_alloc_pages
dma_direct_mmap

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告