On 2020/9/15 5:45, Jakub Kicinski wrote:
> On Mon, 14 Sep 2020 20:06:56 +0800 Huazhong Tan wrote:
>> From: Yunsheng Lin
>>
>> writel() can be used to order I/O vs memory by default when
>> writing portable drivers. Use writel() to replace wmb() +
>> writel_relaxed(), and writel() is dma_wmb() + wr
On Mon, 14 Sep 2020 20:06:56 +0800 Huazhong Tan wrote:
> From: Yunsheng Lin
>
> writel() can be used to order I/O vs memory by default when
> writing portable drivers. Use writel() to replace wmb() +
> writel_relaxed(), and writel() is dma_wmb() + writel_relaxed()
> for ARM64, so there is an opti
From: Yunsheng Lin
writel() can be used to order I/O vs memory by default when
writing portable drivers. Use writel() to replace wmb() +
writel_relaxed(), and writel() is dma_wmb() + writel_relaxed()
for ARM64, so there is an optimization here because dma_wmb()
is a lighter barrier than wmb().
S
