diff options
| 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/governor.c | |
| parent | powercap: idle_inject: Use higher resolution for idle injection (diff) | |
| download | wireguard-linux-cb5d8c45ab6c3daf8269e550cfb2d5018a876fe3.tar.xz wireguard-linux-cb5d8c45ab6c3daf8269e550cfb2d5018a876fe3.zip | |
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/governor.c')
| -rw-r--r-- | drivers/cpuidle/governor.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c index 2e3e14192bee..e9801f26c732 100644 --- a/drivers/cpuidle/governor.c +++ b/drivers/cpuidle/governor.c @@ -20,14 +20,15 @@ char param_governor[CPUIDLE_NAME_LEN]; LIST_HEAD(cpuidle_governors); struct cpuidle_governor *cpuidle_curr_governor; +struct cpuidle_governor *cpuidle_prev_governor; /** - * __cpuidle_find_governor - finds a governor of the specified name + * cpuidle_find_governor - finds a governor of the specified name * @str: the name * * Must be called with cpuidle_lock acquired. */ -static struct cpuidle_governor * __cpuidle_find_governor(const char *str) +struct cpuidle_governor *cpuidle_find_governor(const char *str) { struct cpuidle_governor *gov; @@ -87,7 +88,7 @@ int cpuidle_register_governor(struct cpuidle_governor *gov) return -ENODEV; mutex_lock(&cpuidle_lock); - if (__cpuidle_find_governor(gov->name) == NULL) { + if (cpuidle_find_governor(gov->name) == NULL) { ret = 0; list_add_tail(&gov->governor_list, &cpuidle_governors); if (!cpuidle_curr_governor || |