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

[Alex Deucher]

On Thu, Apr 17, 2025 at 8:30 PM Fugang Duan <fugang.duan at cixtech.com> wrote:
>
> 发件人: Alex Deucher <alexdeucher at gmail.com> 发送时间: 2025年4月17日 21:08
> >On Wed, Apr 16, 2025 at 8:43 PM Fugang Duan <fugang.duan at cixtech.com> wrote:
> >>
> >> 发件人: Alex Deucher <alexdeucher at gmail.com> 发送时间: 2025年4月16日
> >22:49
> >> >收件人: Alexey Klimov <alexey.klimov at linaro.org> 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/cf424020e040be35df
> >> >> > 05b
> >> >> > 682b546b255e74a420f
> >> >>
> >> >> 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
> >> >
> >> 4K page size.  We can try the fix if we got the environment.
> >
> >OK.  that patch won't change anything then.  Can you try this patch instead?
> >
> >Alex
> >
> Alex, it is very sorry that our team don't have the GPU card in hands.
> It is better to ask amd gfx team help to try the fixes.

Sorry, we don't have the problematic arm board.  This code works as
expected on x86.

Alex

>
> >>
> >> Fugang
> >>
> >>
> >>
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