linux-kernel - Re: [PATCH v2 4/4] platform/x86: intel

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Date:   Fri, 19 Oct 2018 15:39:22 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     rajneesh.bhardwaj@...ux.intel.com
Cc:     Platform Driver <platform-driver-x86@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
        matt.turner@...el.com, "Brown, Len" <len.brown@...el.com>,
        Souvik Kumar Chakravarty <souvik.k.chakravarty@...el.com>,
        Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...el.com>
Subject: Re: [PATCH v2 4/4] platform/x86: intel_telemetry: report debugfs failure

On Sat, Oct 6, 2018 at 9:54 AM Rajneesh Bhardwaj
<rajneesh.bhardwaj@...ux.intel.com> wrote:
>
> On some Goldmont based systems such as ASRock J3455M the BIOS may not
> enable the IPC1 device that provides access to the PMC and PUNIT. In
> such scenarios, the IOSS and PSS resources from the platform device can
> not be obtained and result in a invalid telemetry_plt_config which is an
> internal data structure that holds platform config and is maintained by
> the telemetry platform driver.
>
> This is also applicable to the platforms where the BIOS supports IPC1
> device under debug configurations but IPC1 is disabled by user or the
> policy.
>
> This change allows user to know the reason for not seeing entries under
> /sys/kernel/debug/telemetry/* when there is no apparent failure at boot.
>

Pushed to my review and testing queue, thanks!

P.S. I appended one more patch against this file, please check if it's okay.

> Cc: Matt Turner <matt.turner@...el.com>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Souvik Kumar Chakravarty <souvik.k.chakravarty@...el.com>
> Cc: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...el.com>
>
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=198779
> Acked-by: Matt Turner <matt.turner@...el.com>
> Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>
> ---
> Changes in v2:
>  * Removed print and out label both as suggested by Andy.
>  * changed to pr_info.
>  * Other minor style fixes.
>
>
>  drivers/platform/x86/intel_telemetry_debugfs.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c b/drivers/platform/x86/intel_telemetry_debugfs.c
> index ffd0474b0531..1423fa8710fd 100644
> --- a/drivers/platform/x86/intel_telemetry_debugfs.c
> +++ b/drivers/platform/x86/intel_telemetry_debugfs.c
> @@ -951,12 +951,16 @@ static int __init telemetry_debugfs_init(void)
>         debugfs_conf = (struct telemetry_debugfs_conf *)id->driver_data;
>
>         err = telemetry_pltconfig_valid();
> -       if (err < 0)
> +       if (err < 0) {
> +               pr_info("Invalid pltconfig, ensure IPC1 device is enabled in BIOS\n");
>                 return -ENODEV;
> +       }
>
>         err = telemetry_debugfs_check_evts();
> -       if (err < 0)
> +       if (err < 0) {
> +               pr_info("telemetry_debugfs_check_evts failed\n");
>                 return -EINVAL;
> +       }
>
>         register_pm_notifier(&pm_notifier);
>
> --
> 2.17.1
>


-- 
With Best Regards,
Andy Shevchenko