> 在 2014年11月20日，03:05，Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx> 写道：
>
> On Tue, 18 Nov 2014 17:37:06 +0900
> Ethan Zhao <ethan.zhao@xxxxxxxxxx> wrote:
>
>> Add kernel command line parameter
>> intel_pstate = ignore_acpi_ppc
>> and module parameter
>> ignore_acpi_ppc = 1
>> to allow driver to ignore the ACPI _PPC existence even for Sun x86 servers.
>> These parameter could be used for debug\test\workaround etc purpose.
>>
>> Signed-off-by: Ethan Zhao <ethan.zhao@xxxxxxxxxx>
>
> What if we used a more generic parameter like "force" that would bypass
> any vendor specific checks and just load anyway? This way we don't have
> to add new parameters everything some new thing shows up that we want to
> ignore.
>
To be honest, I prefer more generic parameter. But to avoid the possible negative affect
To another vendors. I back to this way.
Thanks,
Ethan
>> ---
>> Documentation/kernel-parameters.txt | 3 +++
>> drivers/cpufreq/intel_pstate.c | 8 +++++++-
>> 2 files changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>> index 4c81a86..f502b85 100644
>> --- a/Documentation/kernel-parameters.txt
>> +++ b/Documentation/kernel-parameters.txt
>> @@ -1446,6 +1446,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>> disable
>> Do not enable intel_pstate as the default
>> scaling driver for the supported processors
>> + ignore_acpi_ppc
>> + Ignore the existence of ACPI method _PPC for Sun x86 servers
>> + and load the driver.
>>
>> intremap= [X86-64, Intel-IOMMU]
>> on enable Interrupt Remapping (default)
>> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
>> index 7c5faea..388387b 100644
>> --- a/drivers/cpufreq/intel_pstate.c
>> +++ b/drivers/cpufreq/intel_pstate.c
>> @@ -870,6 +870,7 @@ static struct cpufreq_driver intel_pstate_driver = {
>> };
>>
>> static int __initdata no_load;
>> +static unsigned int ignore_acpi_ppc;
>>
>> static int intel_pstate_msrs_not_valid(void)
>> {
>> @@ -990,7 +991,7 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
>> 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())
>> + intel_pstate_has_acpi_ppc() && !ignore_acpi_ppc)
>> return true;
>> }
>>
>> @@ -1066,11 +1067,16 @@ static int __init intel_pstate_setup(char *str)
>>
>> if (!strcmp(str, "disable"))
>> no_load = 1;
>> + if (!strcmp(str, "ignore_acpi_ppc"))
>> + ignore_acpi_ppc = 1;
>> return 0;
>> }
>> early_param("intel_pstate", intel_pstate_setup);
>> #endif
>>
>> +module_param(ignore_acpi_ppc, uint, 0644);
>> +MODULE_PARM_DESC(ignore_acpi_ppc,
>> + "value 0 or non-zero. non-zero -> ignore ACPI _PPC and load this driver");
>> MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>");
>> MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
>> MODULE_LICENSE("GPL");
>
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