xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'sched-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull sched/idle changes from Ingo Molnar:
 "More idle code reorganization, to prepare for more integration.

  (Sent separately because it depended on pending timer work, which is
  now upstream)"

* 'sched-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/idle: Add more comments to the code
  sched/idle: Move idle conditions in cpuidle_idle main function
  sched/idle: Reorganize the idle loop
  cpuidle/idle: Move the cpuidle_idle_call function to idle.c
  idle/cpuidle: Split cpuidle_idle_call main function into smaller functions
This commit is contained in:
Linus Torvalds
2014-04-02 16:22:27 -07:00
parent d23082257d a1d028bd6d
commit 05bf58ca4b
3 changed files with 211 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

107
drivers/cpuidle/cpuidle.c
View File

@@ -64,6 +64,26 @@ int cpuidle_play_dead(void)
return -ENODEV;
}
/**
* cpuidle_enabled - check if the cpuidle framework is ready
* @dev: cpuidle device for this cpu
* @drv: cpuidle driver for this cpu
*
* Return 0 on success, otherwise:
* -NODEV : the cpuidle framework is not available
* -EBUSY : the cpuidle framework is not initialized
*/
int cpuidle_enabled(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
if (off || !initialized)
return -ENODEV;
if (!drv || !dev || !dev->enabled)
return -EBUSY;
return 0;
}
/**
* cpuidle_enter_state - enter the state and update stats
* @dev: cpuidle device for this cpu
@@ -109,63 +129,48 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
}
/**
* cpuidle_idle_call - the main idle loop
* cpuidle_select - ask the cpuidle framework to choose an idle state
*
* NOTE: no locks or semaphores should be used here
* return non-zero on failure
* @drv: the cpuidle driver
* @dev: the cpuidle device
*
* Returns the index of the idle state.
*/
int cpuidle_idle_call(void)
int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
struct cpuidle_driver *drv;
int next_state, entered_state;
bool broadcast;
return cpuidle_curr_governor->select(drv, dev);
}
if (off || !initialized)
return -ENODEV;
/**
* cpuidle_enter - enter into the specified idle state
*
* @drv: the cpuidle driver tied with the cpu
* @dev: the cpuidle device
* @index: the index in the idle state table
*
* Returns the index in the idle state, < 0 in case of error.
* The error code depends on the backend driver
*/
int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev,
int index)
{
if (cpuidle_state_is_coupled(dev, drv, index))
return cpuidle_enter_state_coupled(dev, drv, index);
return cpuidle_enter_state(dev, drv, index);
}
/* check if the device is ready */
if (!dev || !dev->enabled)
return -EBUSY;
drv = cpuidle_get_cpu_driver(dev);
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(drv, dev);
if (need_resched()) {
dev->last_residency = 0;
/* give the governor an opportunity to reflect on the outcome */
if (cpuidle_curr_governor->reflect)
cpuidle_curr_governor->reflect(dev, next_state);
local_irq_enable();
return 0;
}
broadcast = !!(drv->states[next_state].flags & CPUIDLE_FLAG_TIMER_STOP);
if (broadcast &&
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu))
return -EBUSY;
trace_cpu_idle_rcuidle(next_state, dev->cpu);
if (cpuidle_state_is_coupled(dev, drv, next_state))
entered_state = cpuidle_enter_state_coupled(dev, drv,
next_state);
else
entered_state = cpuidle_enter_state(dev, drv, next_state);
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
if (broadcast)
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
/* give the governor an opportunity to reflect on the outcome */
/**
* cpuidle_reflect - tell the underlying governor what was the state
* we were in
*
* @dev : the cpuidle device
* @index: the index in the idle state table
*
*/
void cpuidle_reflect(struct cpuidle_device *dev, int index)
{
if (cpuidle_curr_governor->reflect)
cpuidle_curr_governor->reflect(dev, entered_state);
return 0;
cpuidle_curr_governor->reflect(dev, index);
}
/**