From: ethan <ethan.kernel@gmail.com>
To: Dirk Brandewie <dirk.brandewie@gmail.com>
Cc: Ethan Zhao <ethan.zhao@oracle.com>,
"viresh.kumar@linaro.org" <viresh.kumar@linaro.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"corbet@lwn.net" <corbet@lwn.net>,
"dirk.j.brandewie@intel.com" <dirk.j.brandewie@intel.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"joe.jin@oracle.com" <joe.jin@oracle.com>,
"brian.maly@oracle.com" <brian.maly@oracle.com>
Subject: Re: [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method
Date: Thu, 20 Nov 2014 09:07:51 +0800 [thread overview]
Message-ID: <90C55A7F-F1E6-486E-BEA7-9619A67BC7CF@gmail.com> (raw)
In-Reply-To: <546CB057.7040902@intel.com>
Dirk,
> 在 2014年11月19日,22:59,Dirk Brandewie <dirk.brandewie@gmail.com> 写道:
>
>> On 11/18/2014 12:37 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@oracle.com>
>> ---
>> 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, "", ""},
>> };
>
> Does this apply to ALL oracle systems?
Yes, as I know, all recent oracle x86 servers have power capping functions.
>
> Is the presence or absense of the _PPC method configurable in the oracle BIOS?
There is no option in BIOS to enable or disable _PPC. But they configure power limit
Functions via SP(service processors).
Thanks,
Ethan
>
>> @@ -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())
>> + 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)
>
next prev parent reply other threads:[~2014-11-20 1:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-18 8:36 [PATCH 0/3] intel_pstate: allow to be built as module and handle Sun server power capping Ethan Zhao
2014-11-18 8:37 ` [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method Ethan Zhao
2014-11-19 20:22 ` Linda Knippers
2014-11-20 0:52 ` ethan
2014-11-20 16:50 ` Dirk Brandewie
2014-11-21 0:37 ` ethan zhao
2014-11-21 4:44 ` Linda Knippers
2014-11-24 1:41 ` ethan zhao
2014-11-24 15:54 ` Linda Knippers
2014-11-25 0:33 ` ethan
2014-11-18 8:37 ` [PATCH 2/3] intel_pstate: allow driver to be built as a module Ethan Zhao
2014-11-18 20:36 ` Rafael J. Wysocki
2014-11-18 8:37 ` [PATCH 3/3] intel_pstate: add module and kernel command line parameter to ignore ACPI _PPC Ethan Zhao
2014-11-18 8:37 ` [PATCH 0/3] intel_pstate: allow to be built as module and handle Sun server power capping Ethan Zhao
2014-11-18 8:37 ` [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method Ethan Zhao
2014-11-19 14:59 ` Dirk Brandewie
2014-11-20 1:07 ` ethan [this message]
2014-11-18 8:37 ` [PATCH 2/3] intel_pstate: allow driver to be built as a module Ethan Zhao
2014-11-19 18:58 ` Kristen Carlson Accardi
2014-11-20 1:01 ` ethan
2014-11-18 8:37 ` [PATCH 3/3] intel_pstate: add module and kernel command line parameter to ignore ACPI _PPC Ethan Zhao
2014-11-19 19:05 ` Kristen Carlson Accardi
2014-11-20 0:57 ` ethan
2014-11-20 21:23 ` Kristen Carlson Accardi
2014-11-21 3:07 ` Ethan Zhao
2014-11-21 5:00 ` Linda Knippers
2014-11-24 1:56 ` ethan zhao
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