diff options
| author | Lukasz Luba <lukasz.luba@arm.com> | 2024-02-08 11:55:42 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-02-08 15:00:27 +0100 |
| commit | ca0fc871f16f4bef746b5ba814b67afb59119700 (patch) | |
| tree | dc4fb1fe268b4fbcd2cb5c176ab4aff9c487b95b /include/linux/energy_model.h | |
| parent | 8552d6820168d6508bd1f7cd49be248dcb74efb3 (diff) | |
PM: EM: Introduce runtime modifiable table
The new runtime table can be populated with a new power data to better
reflect the actual efficiency of the device e.g. CPU. The power can vary
over time e.g. due to the SoC temperature change. Higher temperature can
increase power values. For longer running scenarios, such as game or
camera, when also other devices are used (e.g. GPU, ISP) the CPU power can
change. The new EM framework is able to addresses this issue and change
the EM data at runtime safely.
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/energy_model.h')
| -rw-r--r-- | include/linux/energy_model.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 1dcd1645dde7..8ddf1d8a9581 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -37,8 +37,19 @@ struct em_perf_state { #define EM_PERF_STATE_INEFFICIENT BIT(0) /** + * struct em_perf_table - Performance states table + * @rcu: RCU used for safe access and destruction + * @state: List of performance states, in ascending order + */ +struct em_perf_table { + struct rcu_head rcu; + struct em_perf_state state[]; +}; + +/** * struct em_perf_domain - Performance domain * @table: List of performance states, in ascending order + * @em_table: Pointer to the runtime modifiable em_perf_table * @nr_perf_states: Number of performance states * @flags: See "em_perf_domain flags" * @cpus: Cpumask covering the CPUs of the domain. It's here @@ -54,6 +65,7 @@ struct em_perf_state { */ struct em_perf_domain { struct em_perf_state *table; + struct em_perf_table __rcu *em_table; int nr_perf_states; unsigned long flags; unsigned long cpus[]; |