Re: 回复: [REGRESSION] amdgpu: async system error exception from hdp_v5_0_flush_hdp()

[Alex Deucher]

On Wed, Apr 16, 2025 at 9:48 AM Alexey Klimov <alexey.klimov at linaro.org> wrote:
>
> On Wed Apr 16, 2025 at 4:12 AM BST, Fugang Duan wrote:
> > 发件人: Alexey Klimov <alexey.klimov at linaro.org> 发送时间: 2025年4月16日 2:28
> >>#regzbot introduced: v6.12..v6.13
>
> [..]
>
> >>The only change related to hdp_v5_0_flush_hdp() was
> >>cf424020e040 drm/amdgpu/hdp5.0: do a posting read when flushing HDP
> >>
> >>Reverting that commit ^^ did help and resolved that problem. Before sending
> >>revert as-is I was interested to know if there supposed to be a proper fix for
> >>this or maybe someone is interested to debug this or have any suggestions.
> >>
> > Can you revert the change and try again https://gitlab.com/linux-kernel/linux/-/commit/cf424020e040be35df05b682b546b255e74a420f
>
> Please read my email in the first place.
> Let me quote just in case:
>
> >The only change related to hdp_v5_0_flush_hdp() was
> >cf424020e040 drm/amdgpu/hdp5.0: do a posting read when flushing HDP
>
> >Reverting that commit ^^ did help and resolved that problem.

We can't really revert the change as that will lead to coherency
problems.  What is the page size on your system?  Does the attached
patch fix it?

Alex

>
> Thanks,
> Alexey
>
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