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cpuidle: Allow enforcing deepest idle state selection

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When idle injection is used to cap power, we need to override the
governor's choice of idle states.

For this reason, make it possible the deepest idle state selection to
be enforced by setting a flag on a given CPU to achieve the maximum
potential power draw reduction.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jacob Pan
2016-11-28 23:03:04 -08:00
committed by Rafael J. Wysocki
parent ed61390bff
commit bb8313b603
3 changed files with 26 additions and 7 deletions
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13
drivers/cpuidle/cpuidle.c
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@@ -97,7 +97,17 @@ static int find_deepest_state(struct cpuidle_driver *drv,
return ret;
}
#ifdef CONFIG_SUSPEND
/* Set the current cpu to use the deepest idle state, override governors */
void cpuidle_use_deepest_state(bool enable)
{
struct cpuidle_device *dev;
preempt_disable();
dev = cpuidle_get_device();
dev->use_deepest_state = enable;
preempt_enable();
}
/**
* cpuidle_find_deepest_state - Find the deepest available idle state.
* @drv: cpuidle driver for the given CPU.
@@ -109,6 +119,7 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
return find_deepest_state(drv, dev, UINT_MAX, 0, false);
}
#ifdef CONFIG_SUSPEND
static void enter_freeze_proper(struct cpuidle_driver *drv,
struct cpuidle_device *dev, int index)
{