Commit 88763a5c authored by Daniel Lezcano's avatar Daniel Lezcano Committed by Rafael J. Wysocki

powercap / idle_inject: Add an idle injection framework

Initially, the cpu_cooling device for ARM was changed by adding a new
policy inserting idle cycles. The intel_powerclamp driver does a
similar action.

Instead of implementing idle injections privately in the cpu_cooling
device, move the idle injection code in a dedicated framework and give
the opportunity to other frameworks to make use of it.

The framework relies on the smpboot kthreads which handles via its
main loop the common code for hotplugging and [un]parking.

This code was previously tested with the cpu cooling device and went
through several iterations. It results now in split code and API
exported in the header file. It was tested with the cpu cooling device
with success.
Signed-off-by: 's avatarDaniel Lezcano <>
Reviewed-by: 's avatarViresh Kumar <>
[ rjw: Rewrite of all comments ]
Signed-off-by: 's avatarRafael J. Wysocki <>
parent 021c9179
......@@ -29,4 +29,14 @@ config INTEL_RAPL
controller, CPU core (Power Plance 0), graphics uncore (Power Plane
1), etc.
bool "Idle injection framework"
depends on CPU_IDLE
default n
This enables support for the idle injection framework. It
provides a way to force idle periods on a set of specified
CPUs for power capping. Idle period can be injected
synchronously on a set of specified CPUs or alternatively
on a per CPU basis.
obj-$(CONFIG_POWERCAP) += powercap_sys.o
obj-$(CONFIG_INTEL_RAPL) += intel_rapl.o
obj-$(CONFIG_IDLE_INJECT) += idle_inject.o
This diff is collapsed.
/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (C) 2018 Linaro Ltd
* Author: Daniel Lezcano <>
#ifndef __IDLE_INJECT_H__
#define __IDLE_INJECT_H__
/* private idle injection device structure */
struct idle_inject_device;
struct idle_inject_device *idle_inject_register(struct cpumask *cpumask);
void idle_inject_unregister(struct idle_inject_device *ii_dev);
int idle_inject_start(struct idle_inject_device *ii_dev);
void idle_inject_stop(struct idle_inject_device *ii_dev);
void idle_inject_set_duration(struct idle_inject_device *ii_dev,
unsigned int run_duration_ms,
unsigned int idle_duration_ms);
void idle_inject_get_duration(struct idle_inject_device *ii_dev,
unsigned int *run_duration_ms,
unsigned int *idle_duration_ms);
#endif /* __IDLE_INJECT_H__ */
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