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

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Date:   Thu, 23 Sep 2021 14:50:47 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Sanket Goswami <Sanket.Goswami@....com>
Cc:     Shyam-sundar.S-k@....com, hdegoede@...hat.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

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?

Cheers,
Nathan