| Message ID | 20250321022858.1538173-3-superm1@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Mario Limonciello |
| Headers | show |
| Series | amd-pstate Dynamic EPP and raw EPP | expand |
On 3/21/2025 7:58 AM, Mario Limonciello wrote: > From: Mario Limonciello <mario.limonciello@amd.com> > > Add `amd_dynamic_epp=enable` and `amd_dynamic_epp=disable` to override > the kernel configuration option `CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP` > locally. > Small correction below, apart from that LGTM Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> > --- > Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ > Documentation/admin-guide/pm/amd-pstate.rst | 7 +++++++ > drivers/cpufreq/amd-pstate.c | 11 +++++++++++ > 3 files changed, 25 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index fb8752b42ec85..1afe6d8ab09bb 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -392,6 +392,13 @@ > disable > Disable amd-pstate preferred core. > > + amd_dynamic_epp= > + [X86] > + disable > + Disable amd-pstate dynamic EPP. > + enable > + Enable amd-pstate dynamic EPP. > + > amijoy.map= [HW,JOY] Amiga joystick support > Map of devices attached to JOY0DAT and JOY1DAT > Format: <a>,<b> > diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst > index 2e076650dc77c..8424e7119dd7e 100644 > --- a/Documentation/admin-guide/pm/amd-pstate.rst > +++ b/Documentation/admin-guide/pm/amd-pstate.rst > @@ -438,6 +438,13 @@ For systems that support ``amd-pstate`` preferred core, the core rankings will > always be advertised by the platform. But OS can choose to ignore that via the > kernel parameter ``amd_prefcore=disable``. > > +``amd_dynamic_epp`` > + > +When AMD pstate is in auto mode, dynamic EPP will control whether the kernel > +autonomously changes the EPP mode. The default is configured by > +``CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP`` but can be explicitly enabled with > +``amd_pstate_epp=enable`` or disabled with ``amd_pstate_epp=disable``. /s/amd_pstate_epp/amd_dynamic_epp/ > + > User Space Interface in ``sysfs`` - General > =========================================== > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 7f203495f60e3..8172bd4b5952f 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -1934,8 +1934,19 @@ static int __init amd_prefcore_param(char *str) > return 0; > } > > +static int __init amd_dynamic_epp_param(char *str) > +{ > + if (!strcmp(str, "disable")) > + dynamic_epp = false; > + if (!strcmp(str, "enable")) > + dynamic_epp = true; > + > + return 0; > +} > + > early_param("amd_pstate", amd_pstate_param); > early_param("amd_prefcore", amd_prefcore_param); > +early_param("amd_dynamic_epp", amd_dynamic_epp_param); > > MODULE_AUTHOR("Huang Rui <ray.huang@amd.com>"); > MODULE_DESCRIPTION("AMD Processor P-state Frequency Driver");
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fb8752b42ec85..1afe6d8ab09bb 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -392,6 +392,13 @@ disable Disable amd-pstate preferred core. + amd_dynamic_epp= + [X86] + disable + Disable amd-pstate dynamic EPP. + enable + Enable amd-pstate dynamic EPP. + amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: <a>,<b> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 2e076650dc77c..8424e7119dd7e 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -438,6 +438,13 @@ For systems that support ``amd-pstate`` preferred core, the core rankings will always be advertised by the platform. But OS can choose to ignore that via the kernel parameter ``amd_prefcore=disable``. +``amd_dynamic_epp`` + +When AMD pstate is in auto mode, dynamic EPP will control whether the kernel +autonomously changes the EPP mode. The default is configured by +``CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP`` but can be explicitly enabled with +``amd_pstate_epp=enable`` or disabled with ``amd_pstate_epp=disable``. + User Space Interface in ``sysfs`` - General =========================================== diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 7f203495f60e3..8172bd4b5952f 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1934,8 +1934,19 @@ static int __init amd_prefcore_param(char *str) return 0; } +static int __init amd_dynamic_epp_param(char *str) +{ + if (!strcmp(str, "disable")) + dynamic_epp = false; + if (!strcmp(str, "enable")) + dynamic_epp = true; + + return 0; +} + early_param("amd_pstate", amd_pstate_param); early_param("amd_prefcore", amd_prefcore_param); +early_param("amd_dynamic_epp", amd_dynamic_epp_param); MODULE_AUTHOR("Huang Rui <ray.huang@amd.com>"); MODULE_DESCRIPTION("AMD Processor P-state Frequency Driver");