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| author | Joao Martins <joao.m.martins@oracle.com> | 2019-09-08 00:45:21 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-09-11 17:36:30 +0200 |
| commit | cb5d8c45ab6c3daf8269e550cfb2d5018a876fe3 (patch) | |
| tree | 0d045a3cc65bd198bf7f139a550005a96b1ef4a5 /drivers/cpuidle/cpuidle.h | |
| parent | cd4c0763064f02f42824eed61be38eafdc702281 (diff) | |
| download | linux-cb5d8c45ab6c3daf8269e550cfb2d5018a876fe3.tar.bz2 | |
cpuidle: allow governor switch on cpuidle_register_driver()
The recently introduced haltpoll driver is largely only useful with
haltpoll governor. To allow drivers to associate with a particular idle
behaviour, add a @governor property to 'struct cpuidle_driver' and thus
allow a cpuidle driver to switch to a *preferred* governor on idle driver
registration. We save the previous governor, and when an idle driver is
unregistered we switch back to that.
The @governor can be overridden by cpuidle.governor= boot param or
alternatively be ignored if the governor doesn't exist.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle.h')
| -rw-r--r-- | drivers/cpuidle/cpuidle.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h index d6613101af92..9f336af17fa6 100644 --- a/drivers/cpuidle/cpuidle.h +++ b/drivers/cpuidle/cpuidle.h @@ -9,6 +9,7 @@ /* For internal use only */ extern char param_governor[]; extern struct cpuidle_governor *cpuidle_curr_governor; +extern struct cpuidle_governor *cpuidle_prev_governor; extern struct list_head cpuidle_governors; extern struct list_head cpuidle_detected_devices; extern struct mutex cpuidle_lock; @@ -22,6 +23,7 @@ extern void cpuidle_install_idle_handler(void); extern void cpuidle_uninstall_idle_handler(void); /* governors */ +extern struct cpuidle_governor *cpuidle_find_governor(const char *str); extern int cpuidle_switch_governor(struct cpuidle_governor *gov); /* sysfs */ |