linux-kernel - Re: [PATCH] x86/platform/uv/BAU: gracefully disable BAU during panic

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Date:   Sun, 3 Jun 2018 21:55:35 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Andrew Banman <abanman@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Mike Travis <mike.travis@....com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Russ Anderson <rja@....com>,
        Dimitri Sivanich <sivanich@....com>
Subject: Re: [PATCH] x86/platform/uv/BAU: gracefully disable BAU during panic

On Sun, Jun 03, 2018 at 11:42:32AM -0500, Andrew Banman wrote:
> When panic happens while BAU is active there is a chance that
> outstanding broadcasts tie up BAU resources enough to cause timeouts in
> the UV ASIC. These timeouts are hardware errors that immediately bring
> down the system, preventing kdump from completing.
> 
> Add uv_bau_crash_shutdown() to bring BAU to quiescence during panic before
> continuing with the native crash shutdown. Assign uv_bau_crash_shutdown
> to machine_ops during init.
> 
> Signed-off-by: Andrew Banman <abanman@....com>
> ---
>  arch/x86/platform/uv/tlb_uv.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>