linux-kernel - Re: [PATCH 0/3] platform/x86: intel_scu

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Message-ID: <934250db-b05f-4d48-8138-06986a14b3fb@linux.intel.com>
Date:   Wed, 30 Aug 2023 20:28:57 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        platform-driver-x86@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Prashant Malani <pmalani@...omium.org>
Subject: Re: [PATCH 0/3] platform/x86: intel_scu_ipc: Timeout fixes



On 8/30/2023 6:14 PM, Stephen Boyd wrote:
> I recently looked at some crash reports on ChromeOS devices that call
> into this intel_scu_ipc driver. They were hitting timeouts, and it
> certainly looks possible for those timeouts to be triggering because of
> scheduling issues. Once things started going south, the timeouts kept

Are you talking about timeouts during IPC command?

> coming. Maybe that's because the other side got seriously confused? I
> don't know. I'll poke at it some more by injecting timeouts on the
> kernel side.

Do you think it is possible due to a firmware issue?

> 
> The first two patches are only lightly tested (normal functions keep
> working), while the third one is purely speculation. I was going to make
> the interrupt delay for a long time to see if I could hit the timeout.
> 
> Stephen Boyd (3):
>   platform/x86: intel_scu_ipc: Check status after timeouts in
>     busy_loop()
>   platform/x86: intel_scu_ipc: Check status upon timeout in
>     ipc_wait_for_interrupt()
>   platform/x86: intel_scu_ipc: Fail IPC send if still busy
> 
>  drivers/platform/x86/intel_scu_ipc.c | 59 ++++++++++++++++++++--------
>  1 file changed, 42 insertions(+), 17 deletions(-)
> 
> 
> base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer