2022-06-22 04:02:10

by Tony W Wang-oc

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

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 <[email protected]>
---
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

2022-06-22 14:08:23

by Rafael J. Wysocki

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

On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <[email protected]> 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 <[email protected]>
> ---
> 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

2022-06-23 01:29:44

by Tony W Wang-oc

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

On 22/6/2022 21:39, Rafael J. Wysocki wrote:
> On Wed, Jun 22, 2022 at 5:44 AM Tony W Wang-oc <[email protected]> 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 <[email protected]>
>> ---
>> 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