linux-kernel - Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has

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Date:	Tue, 02 Dec 2014 09:02:43 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	Dirk Brandewie <dirk.brandewie@...il.com>
CC:	dirk.j.brandewie@...el.com, linda.knippers@...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
Subject: Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has
 _PPC method

Dirk,

On 2014/12/1 23:11, Dirk Brandewie wrote:
> On 11/30/2014 06:32 PM, 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>
>
> In the future you should not add other peoples Signed-off-by or Tested-by
> tags unless they have explicitly told you can do so. Other than that I
> am fine with this patch.
   Got it. many thanks.

   Ethan
>
> --Dirk
>> ---
>>    v2: fix break HP Proliant issue.
>>    v3: expand the hardware vendor list.
>>    v4: refine code.
>>    v5v6: change enum PCC to PPC.
>>
>>   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,
>> +    PPC,
>> +};
>> +
>>   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    ", PPC},
>> +    {1, "ORACLE", "X4-2L   ", PPC},
>> +    {1, "ORACLE", "X4-2B   ", PPC},
>> +    {1, "ORACLE", "X3-2    ", PPC},
>> +    {1, "ORACLE", "X3-2L   ", PPC},
>> +    {1, "ORACLE", "X3-2B   ", PPC},
>> +    {1, "ORACLE", "X4470M2 ", PPC},
>> +    {1, "ORACLE", "X4270M3 ", PPC},
>> +    {1, "ORACLE", "X4270M2 ", PPC},
>> +    {1, "ORACLE", "X4170M2 ", PPC},
>>       {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 PPC:
>> +                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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