Linda，
> 在 2014年11月20日，04:22，Linda Knippers <linda.knippers@xxxxxx> 写道：
>
>> On 11/18/2014 3:37 AM, 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@xxxxxxxxxx>
>> ---
>> drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++
>> 1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
>> index 27bb6d3..5498eb0 100644
>> --- a/drivers/cpufreq/intel_pstate.c
>> +++ b/drivers/cpufreq/intel_pstate.c
>> @@ -943,6 +943,21 @@ 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;
>> +}
>> +
>> struct hw_vendor_info {
>> u16 valid;
>> char oem_id[ACPI_OEM_ID_SIZE];
>> @@ -952,6 +967,7 @@ struct hw_vendor_info {
>> /* Hardware vendor-specific info that has its own power management modes */
>> static struct hw_vendor_info vendor_info[] = {
>> {1, "HP ", "ProLiant"},
>> + {1, "ORACLE", ""},
>> {0, "", ""},
>> };
>>
>> @@ -969,12 +985,16 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
>> !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
>> intel_pstate_no_acpi_pss())
>> return true;
>> + if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
>> + intel_pstate_has_acpi_ppc())
>
> We need try this on a few platforms to make sure this patch doesn't break the
> HP platforms that may or may not need this driver, depending on the BIOS settings.
>
> I don't suppose you tested on a ProLiant too?
I am very glad you could catch this though I missed to CC you.
The code only touch oem_id 'ORACLE' platform, wouldn't break HP's.
But it is good you could test on ProLiant.(not find one around yet)
Thanks,
Ethan
>
> -- ljk
>
>> + return true;
>> }
>>
>> 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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