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authorDaniel Lezcano <daniel.lezcano@linaro.org>2019-11-16 14:16:12 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-11-20 11:32:55 +0100
commitc55b51a06b01d67a99457bb82a8c31081c7faa23 (patch)
treefdde096ae2e1d1b9c946b0a432ce5540f42d3350 /drivers/cpuidle
parentcbda56d5fefcebc01448982a55836c88a825b34c (diff)
downloadlinux-c55b51a06b01d67a99457bb82a8c31081c7faa23.tar.bz2
cpuidle: Allow idle injection to apply exit latency limit
In some cases it may be useful to specify an exit latency limit for the idle state to be used during CPU idle time injection. Instead of duplicating the information in struct cpuidle_device or propagating the latency limit in the call stack, replace the use_deepest_state field with forced_latency_limit_ns to represent that limit, so that the deepest idle state with exit latency within that limit is forced (i.e. no governors) when it is set. A zero exit latency limit for forced idle means to use governors in the usual way (analogous to use_deepest_state equal to "false" before this change). Additionally, add play_idle_precise() taking two arguments, the duration of forced idle and the idle state exit latency limit, both in nanoseconds, and redefine play_idle() as a wrapper around that new function. This change is preparatory, no functional impact is expected. Suggested-by: Rafael J. Wysocki <rafael@kernel.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> [ rjw: Subject, changelog, cpuidle_use_deepest_state() kerneldoc, whitespace ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index bf9b030cd7e1..12077db1158e 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -99,20 +99,21 @@ static int find_deepest_state(struct cpuidle_driver *drv,
}
/**
- * cpuidle_use_deepest_state - Set/clear governor override flag.
- * @enable: New value of the flag.
+ * cpuidle_use_deepest_state - Set/unset governor override mode.
+ * @latency_limit_ns: Idle state exit latency limit (or no override if 0).
*
- * Set/unset the current CPU to use the deepest idle state (override governors
- * going forward if set).
+ * If @latency_limit_ns is nonzero, set the current CPU to use the deepest idle
+ * state with exit latency within @latency_limit_ns (override governors going
+ * forward), or do not override governors if it is zero.
*/
-void cpuidle_use_deepest_state(bool enable)
+void cpuidle_use_deepest_state(u64 latency_limit_ns)
{
struct cpuidle_device *dev;
preempt_disable();
dev = cpuidle_get_device();
if (dev)
- dev->use_deepest_state = enable;
+ dev->forced_idle_latency_limit_ns = latency_limit_ns;
preempt_enable();
}