linux-kernel - Re: [PATCH v2] platform/x86: amd-pmc: Export Idlemask values based on the APU

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Date:   Tue, 28 Sep 2021 16:15:49 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Sanket Goswami <Sanket.Goswami@....com>
Cc:     Shyam-sundar.S-k@....com, mgross@...ux.intel.com,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform/x86: amd-pmc: Export Idlemask values based on
 the APU

Hi,

On 9/23/21 11:50 PM, Nathan Chancellor wrote:
> On Thu, Sep 16, 2021 at 06:10:02PM +0530, Sanket Goswami wrote:
>> IdleMask is the metric used by the PM firmware to know the status of each
>> of the Hardware IP blocks monitored by the PM firmware.
>>
>> Knowing this value is key to get the information of s2idle suspend/resume
>> status. This value is mapped to PMC scratch registers, retrieve them
>> accordingly based on the CPU family and the underlying firmware support.
>>
>> Co-developed-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
>> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
>> Signed-off-by: Sanket Goswami <Sanket.Goswami@....com>
> 
> This patch as commit f6045de1f532 ("platform/x86: amd-pmc: Export
> Idlemask values based on the APU") in -next causes the following errors
> when CONFIG_DEBUG_FS is disabled:
> 
> drivers/platform/x86/amd-pmc.c:424:2: error: implicit declaration of function 'amd_pmc_idlemask_read' [-Werror,-Wimplicit-function-declaration]
>         amd_pmc_idlemask_read(pdev, dev, NULL);
>         ^
> drivers/platform/x86/amd-pmc.c:424:2: note: did you mean 'amd_pmc_reg_read'?
> drivers/platform/x86/amd-pmc.c:131:19: note: 'amd_pmc_reg_read' declared here
> static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
>                   ^
> drivers/platform/x86/amd-pmc.c:448:2: error: implicit declaration of function 'amd_pmc_idlemask_read' [-Werror,-Wimplicit-function-declaration]
>         amd_pmc_idlemask_read(pdev, dev, NULL);
>         ^
> drivers/platform/x86/amd-pmc.c:536:2: error: implicit declaration of function 'amd_pmc_get_smu_version' [-Werror,-Wimplicit-function-declaration]
>         amd_pmc_get_smu_version(dev);
>         ^
> 3 errors generated.
> 
> Should these functions be stubbed or should there be a different fix?

Thank you for the bug report.

Since these functions are also used outside of the debugfs show functions
they simply need to be moved outside of the #ifdef CONFIG_DEBUG_FS
block. I'll add a patch fixing this to pdx86/review-hans and include
it in my next pdx86-fixes pull-req to Linus.

Regards,

Hans