On Thu, Oct 10, 2019 at 09:49:12AM +0100, Russell King - ARM Linux admin wrote:
> Hi Greg,
>
> On 5th October, Christian Zigotzky reported a
> problem with this on PowerPC (at a guess, it looks like there's a
> PowerPC user of this where the DT does not mark the device as
> dma-coherent, but the
Hi Greg,
On 5th October, Christian Zigotzky reported a
problem with this on PowerPC (at a guess, it looks like there's a
PowerPC user of this where the DT does not mark the device as
dma-coherent, but the hardware requires it to be DMA coherent.)
However, despite sending a reply to him within
From: Russell King
commit 121bd08b029e03404c451bb237729cdff76eafed upstream.
We must not unconditionally set the DMA snoop bit; if the DMA API is
assuming that the device is not DMA coherent, and the device snoops the
CPU caches, the device can see stale cache lines brought in by
speculative
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