函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\dma\mapping.c Create Date:2022-07-27 11:32:32
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：dma_get_required_mask

函数原型：u64 dma_get_required_mask(struct device *dev)

返回类型：u64

参数：

类型参数名称
struct device *dev
245  ops等于get_dma_ops(dev)
247  如果dma_is_direct(ops)则返回:dma_direct_get_required_mask(dev)
249  如果get_required_mask则返回:get_required_mask(dev)
260  返回:DMA_BIT_MASK(32)
调用者
名称描述
dma_addressing_limiteddma_addressing_limited - return if the device is addressing limited*@dev: device to check* Return %true if the devices DMA mask is too small to address all memory in* the system, else %false. Lack of addressing bits is the prime reason for