linux-kernel - Re: [PATCH] x86/cstate: Add Zhaoxin ACPI Cx FFH MWAIT support

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Date:   Thu, 23 Jun 2022 09:10:37 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "Borislav Petkov" <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
        <LindaChai@...oxin.com>, <LeoLiu@...oxin.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] x86/cstate: Add Zhaoxin ACPI Cx FFH MWAIT support



On 22/6/2022 21:38, Rafael J. Wysocki wrote:
> Please CC linux-acpi@...r.kernel.org on ACPI-related changes (added now).

Ok.

> 
> On Wed, Jun 22, 2022 at 5:29 AM Tony W Wang-oc <TonyWWang-oc@...oxin.com> wrote:
>>
>> Recent Zhaoxin CPUs support X86_FEATURE_MWAIT that implies the
>> MONITOR/MWAIT instructions can be used for ACPI Cx state. The BIOS
>> declares Cx state in _CST object to use FFH on Zhaoxin systems. So
>> let function ffh_cstate_init() support Zhaoxin too.
>>
>> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
>> ---
>>    arch/x86/kernel/acpi/cstate.c | 4 +++-
>>    1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
>> index 7945eae..d4185e1 100644
>> --- a/arch/x86/kernel/acpi/cstate.c
>> +++ b/arch/x86/kernel/acpi/cstate.c
>> @@ -213,7 +213,9 @@ static int __init ffh_cstate_init(void)
>>
>>          if (c->x86_vendor != X86_VENDOR_INTEL &&
>>              c->x86_vendor != X86_VENDOR_AMD &&
>> -           c->x86_vendor != X86_VENDOR_HYGON)
>> +           c->x86_vendor != X86_VENDOR_HYGON &&
>> +           c->x86_vendor != X86_VENDOR_CENTAUR &&
>> +           c->x86_vendor != X86_VENDOR_ZHAOXIN)
> 
> Centaur is not mentioned in the changelog and it should be.

Will add Centaur in the changelog. Thanks a lot.

> 
>>                  return -1;
>>
>>          cpu_cstate_entry = alloc_percpu(struct cstate_entry);
>> --
> .
> 

-- 
Sincerely
TonyWWang-oc