Add a new amd pstate driver command line option to enable driver passive
working mode via MSR and shared memory interface to request desired
performance within abstract scale and the power management firmware
(SMU) convert the perf requests into actual hardware pstates.
Also the `disable` parameter can disable the pstate driver loading by
adding `amd_pstate=disable` to kernel command line.
Signed-off-by: Perry Yuan <[email protected]>
---
Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a465d5242774..42af9ca0127e 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6959,3 +6959,14 @@
memory, and other data can't be written using
xmon commands.
off xmon is disabled.
+
+ amd_pstate= [X86]
+ disable
+ Do not enable amd_pstate as the default
+ scaling driver for the supported processors
+ passive
+ Use amd_pstate as a scaling driver, driver requests a
+ desired performance on this abstract scale and the power
+ management firmware translates the requests into actual
+ hardware states (core frequency, data fabric and memory
+ clocks etc.)
--
2.25.1
On Thu, Nov 17, 2022 at 10:49:55AM +0800, Perry Yuan wrote:
> Add a new amd pstate driver command line option to enable driver passive
> working mode via MSR and shared memory interface to request desired
> performance within abstract scale and the power management firmware
> (SMU) convert the perf requests into actual hardware pstates.
>
> Also the `disable` parameter can disable the pstate driver loading by
> adding `amd_pstate=disable` to kernel command line.
>
> Signed-off-by: Perry Yuan <[email protected]>
Reviewed-by: Gautham R. Shenoy <[email protected]>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a465d5242774..42af9ca0127e 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6959,3 +6959,14 @@
> memory, and other data can't be written using
> xmon commands.
> off xmon is disabled.
> +
> + amd_pstate= [X86]
> + disable
> + Do not enable amd_pstate as the default
> + scaling driver for the supported processors
> + passive
> + Use amd_pstate as a scaling driver, driver requests a
> + desired performance on this abstract scale and the power
> + management firmware translates the requests into actual
> + hardware states (core frequency, data fabric and memory
> + clocks etc.)
> --
> 2.25.1
>
On 11/17/2022 8:19 AM, Perry Yuan wrote:
> Add a new amd pstate driver command line option to enable driver passive
> working mode via MSR and shared memory interface to request desired
> performance within abstract scale and the power management firmware
> (SMU) convert the perf requests into actual hardware pstates.
>
> Also the `disable` parameter can disable the pstate driver loading by
> adding `amd_pstate=disable` to kernel command line.
>
> Signed-off-by: Perry Yuan <[email protected]>
Tested-by: Wyes Karny <[email protected]>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a465d5242774..42af9ca0127e 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6959,3 +6959,14 @@
> memory, and other data can't be written using
> xmon commands.
> off xmon is disabled.
> +
> + amd_pstate= [X86]
> + disable
> + Do not enable amd_pstate as the default
> + scaling driver for the supported processors
> + passive
> + Use amd_pstate as a scaling driver, driver requests a
> + desired performance on this abstract scale and the power
> + management firmware translates the requests into actual
> + hardware states (core frequency, data fabric and memory
> + clocks etc.)
--
Thanks & Regards,
Wyes