函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\dma-mapping.h Create Date:2022-07-27 06:51:44
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Similar to the above, except it deals with the case where the device* does not have dev->dma_mask appropriately setup.

函数原型：static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)

返回类型：int

参数：

类型参数名称
struct device *dev
u64mask
683  dma mask (if dma'able device) 等于 Like dma_mask, but for alloc_coherent mappings as not all hardware supports 64 bit addresses for consistent allocations such descriptors.
684  返回:Set both the DMA mask and the coherent DMA mask to the same thing.* Note that we don't check the return value from dma_set_coherent_mask()* as the DMA API guarantees that the coherent DMA mask can be set to* the same or smaller than the streaming DMA mask.