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-rw-r--r--drivers/cpuidle/cpuidle-pseries.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 3e058ad2bb51..31c8e51162b2 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -86,19 +86,27 @@ static void check_and_cede_processor(void)
}
}
+#define NR_DEDICATED_STATES 2 /* snooze, CEDE */
+
+static u8 cede_latency_hint[NR_DEDICATED_STATES];
+
static int dedicated_cede_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
+ u8 old_latency_hint;
pseries_idle_prolog();
get_lppaca()->donate_dedicated_cpu = 1;
+ old_latency_hint = get_lppaca()->cede_latency_hint;
+ get_lppaca()->cede_latency_hint = cede_latency_hint[index];
HMT_medium();
check_and_cede_processor();
local_irq_disable();
get_lppaca()->donate_dedicated_cpu = 0;
+ get_lppaca()->cede_latency_hint = old_latency_hint;
pseries_idle_epilog();
@@ -130,7 +138,7 @@ static int shared_cede_loop(struct cpuidle_device *dev,
/*
* States for dedicated partition case.
*/
-static struct cpuidle_state dedicated_states[] = {
+static struct cpuidle_state dedicated_states[NR_DEDICATED_STATES] = {
{ /* Snooze */
.name = "snooze",
.desc = "snooze",
@@ -233,7 +241,7 @@ static int pseries_idle_probe(void)
max_idle_state = ARRAY_SIZE(shared_states);
} else {
cpuidle_state_table = dedicated_states;
- max_idle_state = ARRAY_SIZE(dedicated_states);
+ max_idle_state = NR_DEDICATED_STATES;
}
} else
return -ENODEV;