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cpuidle: teo: Optionally skip polling states in teo_find_shallower_state()

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Add a no_poll flag to teo_find_shallower_state() that will let the
function optionally not consider polling states.

This allows the caller to guard against the function inadvertently
resulting in TEO putting the CPU in a polling state when that
behaviour is undesirable.

Signed-off-by: Kajetan Puchalski <kajetan.puchalski@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kajetan Puchalski 2023-01-05 14:51:58 +00:00 committed by Rafael J. Wysocki
parent b7bfaa761d
commit 27f8508801
1 changed files with 5 additions and 3 deletions
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8
drivers/cpuidle/governors/teo.c
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@ -258,15 +258,17 @@ static s64 teo_middle_of_bin(int idx, struct cpuidle_driver *drv)
* @dev: Target CPU.
* @state_idx: Index of the capping idle state.
* @duration_ns: Idle duration value to match.
* @no_poll: Don't consider polling states.
*/
static int teo_find_shallower_state(struct cpuidle_driver *drv,
struct cpuidle_device *dev, int state_idx,
s64 duration_ns)
s64 duration_ns, bool no_poll)
{
int i;
for (i = state_idx - 1; i >= 0; i--) {
if (dev->states_usage[i].disable)
if (dev->states_usage[i].disable ||
(no_poll && drv->states[i].flags & CPUIDLE_FLAG_POLLING))
continue;
state_idx = i;
@ -469,7 +471,7 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
*/
if (idx > idx0 &&
drv->states[idx].target_residency_ns > delta_tick)
idx = teo_find_shallower_state(drv, dev, idx, delta_tick);
idx = teo_find_shallower_state(drv, dev, idx, delta_tick, false);
}
return idx;