linux-kernel - RE: [RESEND PATCH V2 4/9] x86/msr: Add the MSR definition for AMD CPPC boost state

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Date:   Mon, 24 Oct 2022 02:58:07 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     Borislav Petkov <bp@...en8.de>, "Huang, Ray" <Ray.Huang@....com>
CC:     "Limonciello, Mario" <Mario.Limonciello@....com>,
        "rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RESEND PATCH V2 4/9] x86/msr: Add the MSR definition for AMD
 CPPC boost state

[AMD Official Use Only - General]

Hi Boris.

> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Friday, October 21, 2022 5:38 PM
> To: Huang, Ray <Ray.Huang@....com>
> Cc: Limonciello, Mario <Mario.Limonciello@....com>; Yuan, Perry
> <Perry.Yuan@....com>; rafael.j.wysocki@...el.com;
> viresh.kumar@...aro.org; Sharma, Deepak <Deepak.Sharma@....com>;
> Fontenot, Nathan <Nathan.Fontenot@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Du, Xiaojian <Xiaojian.Du@....com>; Meng,
> Li (Jassmine) <Li.Meng@....com>; linux-pm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [RESEND PATCH V2 4/9] x86/msr: Add the MSR definition for
> AMD CPPC boost state
> 
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
> 
> 
> On Fri, Oct 21, 2022 at 01:22:11PM +0800, Huang Rui wrote:
> > > > If I rename that the MSR definition string, that will cause lots
> > > > of driver file change.
> > > > So I suggest to add one new MSR macro for the CPPC, the
> > > > MSR_K7_HWCR is mismatching in the CPPC Pstate driver.
> > > > If you refuse to use this new one, I will reuse that old one.
> > >
> > > To avoid changing too much stuff at once how about if you give an alias?
> > > IE something like:
> > >
> > > #define MSR_AMD_CPPC_HW_CTL MSR_K7_HWCR
> 
> Why would you all even think about adding a new name and not use
> MSR_K7_HWCR?
> 
> The other code uses it just fine, do git grep MSR_K7_HWCR.
> 
> We have waaay too many MSRs, no need to unnecessarily confuse people
> with an alias or rename stuff. Just use MSR_K7_HWCR like everything else
> does.
> 
> --
> Regards/Gruss,
>     Boris.
> 

Sure, we can continue to use that MSR definition as you suggested.
Thank you comment on this.

Perry.

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