cpuidle: Add cpuidle.governor= command line parameter

Add cpuidle.governor= command line parameter to allow the default
cpuidle governor to be replaced.

That is useful, for example, if someone running a tickful kernel
wants to use the menu governor on it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

5 files changed, 19 insertions, 2 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 19f4423e70d9..60fb9913af48 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -674,6 +674,9 @@
         cpuidle.off=1   [CPU_IDLE]
                         disable the cpuidle sub-system
 
+        cpuidle.governor=
+                        [CPU_IDLE] Name of the cpuidle governor to use.
+
         cpufreq.off=1   [CPU_FREQ]
                         disable the cpufreq sub-system
 
diff --git a/Documentation/admin-guide/pm/cpuidle.rst b/Documentation/admin-guide/pm/cpuidle.rst
index 80b4f26547ac..9a34484fd6e4 100644
--- a/Documentation/admin-guide/pm/cpuidle.rst
+++ b/Documentation/admin-guide/pm/cpuidle.rst
@@ -566,6 +566,13 @@ processors implementing the architecture (i.e. CPU instruction set) in question,
 however, so it is rather crude and not very energy-efficient.  For this reason,
 it is not recommended for production use.
 
+The ``cpuidle.governor=`` kernel command line switch allows the ``CPUIdle``
+governor to use to be specified.  It has to be appended with a string matching
+the name of an available governor (e.g. ``cpuidle.governor=menu``) and that
+governor will be used instead of the default one.  It is possible to force
+the ``menu`` governor to be used on the systems that use the ``ladder`` governor
+by default this way, for example.
+
 The other kernel command line parameters controlling CPU idle time management
 described below are only relevant for the *x86* architecture and some of
 them affect Intel processors only.
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 4a97446f66d8..f7c58043e50f 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -702,4 +702,5 @@ static int __init cpuidle_init(void)
 }
 
 module_param(off, int, 0444);
+module_param_string(governor, param_governor, CPUIDLE_NAME_LEN, 0444);
 core_initcall(cpuidle_init);
diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h
index 2965ab32a583..d6613101af92 100644
--- a/drivers/cpuidle/cpuidle.h
+++ b/drivers/cpuidle/cpuidle.h
@@ -7,6 +7,7 @@
 #define __DRIVER_CPUIDLE_H
 
 /* For internal use only */
+extern char param_governor[];
 extern struct cpuidle_governor *cpuidle_curr_governor;
 extern struct list_head cpuidle_governors;
 extern struct list_head cpuidle_detected_devices;
diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c
index 9fed1b829292..bb93e5cf6a4a 100644
--- a/drivers/cpuidle/governor.c
+++ b/drivers/cpuidle/governor.c
@@ -11,10 +11,13 @@
 #include <linux/cpu.h>
 #include <linux/cpuidle.h>
 #include <linux/mutex.h>
+#include <linux/module.h>
 #include <linux/pm_qos.h>
 
 #include "cpuidle.h"
 
+char param_governor[CPUIDLE_NAME_LEN];
+
 LIST_HEAD(cpuidle_governors);
 struct cpuidle_governor *cpuidle_curr_governor;
 
@@ -86,9 +89,11 @@ int cpuidle_register_governor(struct cpuidle_governor *gov)
         mutex_lock(&cpuidle_lock);
         if (__cpuidle_find_governor(gov->name) == NULL) {
                 ret = 0;
-                list_add_tail(&gov->governor_list, &cpuidle_governors);
                 if (!cpuidle_curr_governor ||
-                    cpuidle_curr_governor->rating < gov->rating)
+                    !strncasecmp(param_governor, gov->name, CPUIDLE_NAME_LEN) ||
+                    (cpuidle_curr_governor->rating < gov->rating &&
+                     strncasecmp(param_governor, cpuidle_curr_governor->name,
+                                 CPUIDLE_NAME_LEN)))
                         cpuidle_switch_governor(gov);
         }
         mutex_unlock(&cpuidle_lock);