cpufreq: Add Zhaoxin turbo boost control interface support

[PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

Posted by Tony W Wang-oc 3 years, 10 months ago

Recent Zhaoxin CPUs support X86_FEATURE_IDA and the turbo boost can
be dynamically enabled or disabled through MSR 0x1a0[38] in the same
way as Intel. So add turbo boost control support for Zhaoxin too.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
---
  drivers/cpufreq/acpi-cpufreq.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 3d514b8..1bb2b90 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -78,6 +78,8 @@ static bool boost_state(unsigned int cpu)

  	switch (boot_cpu_data.x86_vendor) {
  	case X86_VENDOR_INTEL:
+	case X86_VENDOR_CENTAUR:
+	case X86_VENDOR_ZHAOXIN:
  		rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
  		msr = lo | ((u64)hi << 32);
  		return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
@@ -97,6 +99,8 @@ static int boost_set_msr(bool enable)

  	switch (boot_cpu_data.x86_vendor) {
  	case X86_VENDOR_INTEL:
+	case X86_VENDOR_CENTAUR:
+	case X86_VENDOR_ZHAOXIN:
  		msr_addr = MSR_IA32_MISC_ENABLE;
  		msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
  		break;
-- 
2.7.4

Re: [PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

Posted by Rafael J. Wysocki 3 years, 10 months ago

On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <TonyWWang-oc@zhaoxin.com> wrote:
>
> Recent Zhaoxin CPUs support X86_FEATURE_IDA and the turbo boost can
> be dynamically enabled or disabled through MSR 0x1a0[38] in the same
> way as Intel. So add turbo boost control support for Zhaoxin too.

And for Centaur too according to the code changes below.

>
> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
> ---
>   drivers/cpufreq/acpi-cpufreq.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index 3d514b8..1bb2b90 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -78,6 +78,8 @@ static bool boost_state(unsigned int cpu)
>
>         switch (boot_cpu_data.x86_vendor) {
>         case X86_VENDOR_INTEL:
> +       case X86_VENDOR_CENTAUR:
> +       case X86_VENDOR_ZHAOXIN:
>                 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
>                 msr = lo | ((u64)hi << 32);
>                 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
> @@ -97,6 +99,8 @@ static int boost_set_msr(bool enable)
>
>         switch (boot_cpu_data.x86_vendor) {
>         case X86_VENDOR_INTEL:
> +       case X86_VENDOR_CENTAUR:
> +       case X86_VENDOR_ZHAOXIN:
>                 msr_addr = MSR_IA32_MISC_ENABLE;
>                 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
>                 break;
> --
> 2.7.4

Re: [PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

Posted by Tony W Wang-oc 3 years, 10 months ago


On 22/6/2022 21:39, Rafael J. Wysocki wrote:
> On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <TonyWWang-oc@zhaoxin.com> wrote:
>>
>> Recent Zhaoxin CPUs support X86_FEATURE_IDA and the turbo boost can
>> be dynamically enabled or disabled through MSR 0x1a0[38] in the same
>> way as Intel. So add turbo boost control support for Zhaoxin too.
> 
> And for Centaur too according to the code changes below.

Ok, thanks a lot.

> 
>>
>> Signed-off-by: Tony W Wang-oc <TonyWWang-oc@zhaoxin.com>
>> ---
>>    drivers/cpufreq/acpi-cpufreq.c | 4 ++++
>>    1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
>> index 3d514b8..1bb2b90 100644
>> --- a/drivers/cpufreq/acpi-cpufreq.c
>> +++ b/drivers/cpufreq/acpi-cpufreq.c
>> @@ -78,6 +78,8 @@ static bool boost_state(unsigned int cpu)
>>
>>          switch (boot_cpu_data.x86_vendor) {
>>          case X86_VENDOR_INTEL:
>> +       case X86_VENDOR_CENTAUR:
>> +       case X86_VENDOR_ZHAOXIN:
>>                  rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
>>                  msr = lo | ((u64)hi << 32);
>>                  return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
>> @@ -97,6 +99,8 @@ static int boost_set_msr(bool enable)
>>
>>          switch (boot_cpu_data.x86_vendor) {
>>          case X86_VENDOR_INTEL:
>> +       case X86_VENDOR_CENTAUR:
>> +       case X86_VENDOR_ZHAOXIN:
>>                  msr_addr = MSR_IA32_MISC_ENABLE;
>>                  msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
>>                  break;
>> --
>> 2.7.4
> .
> 

-- 
Sincerely
TonyWWang-oc