linux-kernel - Re: [PATCH 1/3] ACPI: CPPC: Add get the highest perf register value support

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Date: Wed, 31 Jan 2024 18:52:10 +0800
From: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
CC: <rafael@...nel.org>, <lenb@...nel.org>, <robert.moore@...el.com>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<acpica-devel@...ts.linux.dev>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	<hpa@...or.com>, <mcgrof@...nel.org>, <peterz@...radead.org>,
	<j.granados@...sung.com>, <viresh.kumar@...aro.org>,
	<linux-pm@...r.kernel.org>, <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
	<LeoLiu-oc@...oxin.com>, <LindaChai@...oxin.com>
Subject: Re: [PATCH 1/3] ACPI: CPPC: Add get the highest perf register value
 support


On 2024/1/18 06:07, Ricardo Neri wrote:
>
> [这封邮件来自外部发件人]
>
> On Thu, Dec 28, 2023 at 03:57:03PM +0800, Tony W Wang-oc wrote:
>> Add function cppc_get_highest_perf in generic CPPC driver to get the
>> highest perf register value for specified core.
>>
>> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
>> ---
>>   drivers/acpi/cppc_acpi.c | 13 +++++++++++++
>>   include/acpi/cppc_acpi.h |  5 +++++
>>   2 files changed, 18 insertions(+)
>>
>> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
>> index 7ff269a78c20..1a77c514d007 100644
>> --- a/drivers/acpi/cppc_acpi.c
>> +++ b/drivers/acpi/cppc_acpi.c
>> @@ -1154,6 +1154,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
>>        return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf);
>>   }
>>
>> +/**
>> + * cppc_get_highest_perf - Get the highest performance register value.
>> + * @cpunum: CPU from which to get highest performance.
>> + * @highest_perf: Return address.
>> + *
>> + * Return: 0 for success, -EIO otherwise.
>> + */
>> +int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
>> +{
>> +     return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf);
>> +}
>> +EXPORT_SYMBOL_GPL(cppc_get_highest_perf);
> The Intel P-State driver uses cppc_get_perf_caps(). You would not need to
> export this function.
>
> Having said that, the Intel P-State driver could also use this new
> function, IMO. AFAICS, it does not *have* to use cppc_get_perf_caps().

Yes, you are right.