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

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Message-ID: <b1d972ce-6672-344c-e432-c8bc9bb20dad@linux.intel.com>
Date:   Tue, 30 Oct 2018 13:11:10 +0530
From:   "Bhardwaj, Rajneesh" <rajneesh.bhardwaj@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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 19-Oct-18 6:09 PM, Andy Shevchenko wrote:
> 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.

Thank you Andy. I will check it when Infradead is online.

>
>> 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
>>
>