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| author | Wyes Karny <wyes.karny@amd.com> | 2023-03-07 14:27:38 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-03-17 21:06:23 +0300 |
| commit | 2dd6d0ebf74049256160a3d03dabbd92fe0b8599 (patch) | |
| tree | b4e11ac524326526e89b7f57cc0816611839a817 /include/linux/amd-pstate.h | |
| parent | 3e6e078057640751654bda9fd2278a944f61fa4a (diff) | |
| download | linux-2dd6d0ebf74049256160a3d03dabbd92fe0b8599.tar.xz | |
cpufreq: amd-pstate: Add guided autonomous mode
From ACPI spec below 3 modes for CPPC can be defined:
1. Non autonomous: OS scaling governor specifies operating frequency/
performance level through `Desired Performance` register and platform
follows that.
2. Guided autonomous: OS scaling governor specifies min and max
frequencies/ performance levels through `Minimum Performance` and
`Maximum Performance` register, and platform can autonomously select an
operating frequency in this range.
3. Fully autonomous: OS only hints (via EPP) to platform for the required
energy performance preference for the workload and platform autonomously
scales the frequency.
Currently (1) is supported by amd_pstate as passive mode, and (3) is
implemented by EPP support. This change is to support (2).
In guided autonomous mode the min_perf is based on the input from the
scaling governor. For example, in case of schedutil this value depends
on the current utilization. And max_perf is set to max capacity.
To activate guided auto mode ``amd_pstate=guided`` command line
parameter has to be passed in the kernel.
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/amd-pstate.h')
| -rw-r--r-- | include/linux/amd-pstate.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index f5f22418e64b..c10ebf8c42e6 100644 --- a/include/linux/amd-pstate.h +++ b/include/linux/amd-pstate.h @@ -97,6 +97,7 @@ enum amd_pstate_mode { AMD_PSTATE_DISABLE = 0, AMD_PSTATE_PASSIVE, AMD_PSTATE_ACTIVE, + AMD_PSTATE_GUIDED, AMD_PSTATE_MAX, }; @@ -104,6 +105,7 @@ static const char * const amd_pstate_mode_string[] = { [AMD_PSTATE_DISABLE] = "disable", [AMD_PSTATE_PASSIVE] = "passive", [AMD_PSTATE_ACTIVE] = "active", + [AMD_PSTATE_GUIDED] = "guided", NULL, }; #endif /* _LINUX_AMD_PSTATE_H */ |