linux-kernel - Re: [PATCH 1/2 V4] intel_pstate: skip this driver if Sun server has

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Date:	Mon, 01 Dec 2014 09:26:05 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
CC:	dirk.j.brandewie@...el.com, viresh.kumar@...aro.org,
	rjw@...ysocki.net, corbet@....net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	ethan.kernel@...il.com, joe.jin@...cle.com, brian.maly@...cle.com,
	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: Re: [PATCH 1/2 V4] intel_pstate: skip this driver if Sun server has
 _PPC method

Yasuaki,

On 2014/11/28 13:20, Yasuaki Ishimatsu wrote:
> (2014/11/28 12:36), Ethan Zhao wrote:
>> Oracle Sun X86 servers have dynamic power capping capability that works via
>> ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC
>> enabled.
>>
>> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
>> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
>> Tested-by: Linda Knippers <linda.knippers@...com>
>> ---
>>    v2: fix break HP Proliant issue.
>>    v3: expand the hardware vendor list.
>>    v4: refine code.
>>
>>   drivers/cpufreq/intel_pstate.c | 45 ++++++++++++++++++++++++++++++++++++++----
>>   1 file changed, 41 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
>> index 27bb6d3..1bb62ca 100644
>> --- a/drivers/cpufreq/intel_pstate.c
>> +++ b/drivers/cpufreq/intel_pstate.c
>> @@ -943,15 +943,46 @@ static bool intel_pstate_no_acpi_pss(void)
>>   	return true;
>>   }
>>   
>> +static bool intel_pstate_has_acpi_ppc(void)
>> +{
>> +	int i;
>> +
>> +	for_each_possible_cpu(i) {
>> +		struct acpi_processor *pr = per_cpu(processors, i);
>> +
>> +		if (!pr)
>> +			continue;
>> +		if (acpi_has_method(pr->handle, "_PPC"))
>> +			return true;
>> +	}
>> +	return false;
>> +}
>> +
>> +enum {
>> +	PSS,
>> +	PCC,
>> +};
> What does PCC stand for? Is it PPC?

Good catch, should be PPC, not PCC.
> Thanks,
> Yasuaki Ishimatsu
>
>> +
>>   struct hw_vendor_info {
>>   	u16  valid;
>>   	char oem_id[ACPI_OEM_ID_SIZE];
>>   	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
>> +	int  oem_pwr_table;
>>   };
>>   
>>   /* Hardware vendor-specific info that has its own power management modes */
>>   static struct hw_vendor_info vendor_info[] = {
>> -	{1, "HP    ", "ProLiant"},
>> +	{1, "HP    ", "ProLiant", PSS},
>> +	{1, "ORACLE", "X4-2    ", PCC},
>> +	{1, "ORACLE", "X4-2L   ", PCC},
>> +	{1, "ORACLE", "X4-2B   ", PCC},
>> +	{1, "ORACLE", "X3-2    ", PCC},
>> +	{1, "ORACLE", "X3-2L   ", PCC},
>> +	{1, "ORACLE", "X3-2B   ", PCC},
>> +	{1, "ORACLE", "X4470M2 ", PCC},
>> +	{1, "ORACLE", "X4270M3 ", PCC},
>> +	{1, "ORACLE", "X4270M2 ", PCC},
>> +	{1, "ORACLE", "X4170M2 ", PCC},
>>   	{0, "", ""},
>>   };
>>   
>> @@ -966,15 +997,21 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
>>   
>>   	for (v_info = vendor_info; v_info->valid; v_info++) {
>>   		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
>> -		    !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
>> -		    intel_pstate_no_acpi_pss())
>> -			return true;
>> +			!strncmp(hdr.oem_table_id, v_info->oem_table_id,
>> +						ACPI_OEM_TABLE_ID_SIZE))
>> +			switch (v_info->oem_pwr_table) {
>> +			case PSS:
>> +				return intel_pstate_no_acpi_pss();
>> +			case PCC:
>> +				return intel_pstate_has_acpi_ppc();
>> +			}
>>   	}
>>   
>>   	return false;
>>   }
>>   #else /* CONFIG_ACPI not enabled */
>>   static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
>> +static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
>>   #endif /* CONFIG_ACPI */
>>   
>>   static int __init intel_pstate_init(void)
>>
>

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