linux-kernel - Re: [PATCH v2 4/4] platform/x86/amd: pmc: Use pm_pr

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Date:   Thu, 25 May 2023 12:13:15 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Limonciello, Mario" <Mario.Limonciello@....com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>
Cc:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "Natikar, Basavaraj" <Basavaraj.Natikar@....com>
Subject: Re: [PATCH v2 4/4] platform/x86/amd: pmc: Use pm_pr_dbg() for suspend
 related messages

Hi Mario,

On 5/23/23 18:21, Limonciello, Mario wrote:
> [AMD Official Use Only - General]
> 
>> -----Original Message-----
>> From: Hans de Goede <hdegoede@...hat.com>
>> Sent: Tuesday, May 23, 2023 6:08 AM
>> To: Limonciello, Mario <Mario.Limonciello@....com>; rafael@...nel.org;
>> linus.walleij@...aro.org
>> Cc: linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
>> gpio@...r.kernel.org; platform-driver-x86@...r.kernel.org; linux-
>> pm@...r.kernel.org; S-k, Shyam-sundar <Shyam-sundar.S-k@....com>;
>> Natikar, Basavaraj <Basavaraj.Natikar@....com>
>> Subject: Re: [PATCH v2 4/4] platform/x86/amd: pmc: Use pm_pr_dbg() for
>> suspend related messages
>>
>> Hi Mario,
>>
>> On 5/22/23 22:00, Mario Limonciello wrote:
>>> Using pm_pr_dbg() allows users to toggle
>> `/sys/power/pm_debug_messages`
>>> as a single knob to turn on messages that amd-pmc can emit to aid in
>>> any s2idle debugging.
>>>
>>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>>> ---
>>>  drivers/platform/x86/amd/pmc.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/platform/x86/amd/pmc.c
>> b/drivers/platform/x86/amd/pmc.c
>>> index 427905714f79..1304cd6f13f6 100644
>>> --- a/drivers/platform/x86/amd/pmc.c
>>> +++ b/drivers/platform/x86/amd/pmc.c
>>> @@ -543,7 +543,7 @@ static int amd_pmc_idlemask_read(struct
>> amd_pmc_dev *pdev, struct device *dev,
>>>     }
>>>
>>>     if (dev)
>>> -           dev_dbg(pdev->dev, "SMU idlemask s0i3: 0x%x\n", val);
>>> +           pm_pr_dbg("SMU idlemask s0i3: 0x%x\n", val);
>>>
>>>     if (s)
>>>             seq_printf(s, "SMU idlemask : 0x%x\n", val);
>>
>> This does not compile, amd/pmc.c may be build as an amd-pmc.ko module
>> and currently the pm_debug_messages_on flag used by pm_pr_dbg()
>> is not exported to modules:
>>
>>   CC [M]  drivers/platform/x86/amd/pmc.o
>>   LD [M]  drivers/platform/x86/amd/amd-pmc.o
>>   MODPOST Module.symvers
>> ERROR: modpost: "pm_debug_messages_on"
>> [drivers/platform/x86/amd/amd-pmc.ko] undefined!
>> make[1]: *** [scripts/Makefile.modpost:136: Module.symvers] Error 1
>> make: *** [Makefile:1978: modpost] Error 2
>>
>> Regards,
>>
>> Hans
>>
> 
> My apologies, yes I was compiling in when testing.  Let me ask if this
> series makes sense and is "generally" agreeable though.

I have no objections against this series, otherwise I don't really
have a strong opinion on this series.

If this makes sense and if exporting pm_debug_messages_on is ok
is Rafael's call to make IMHO.

Rafael ?

Regards,

Hans