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path: root/drivers/idle/intel_idle.c
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Diffstat (limited to 'drivers/idle/intel_idle.c')
-rw-r--r--drivers/idle/intel_idle.c37
1 files changed, 20 insertions, 17 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 01bace49a962..7ee7ffe22ae3 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -126,26 +126,9 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev,
struct cpuidle_state *state = &drv->states[index];
unsigned long eax = flg2MWAIT(state->flags);
unsigned long ecx = 1; /* break on interrupt flag */
- bool tick;
-
- if (!static_cpu_has(X86_FEATURE_ARAT)) {
- /*
- * Switch over to one-shot tick broadcast if the target C-state
- * is deeper than C1.
- */
- if ((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) {
- tick = true;
- tick_broadcast_enter();
- } else {
- tick = false;
- }
- }
mwait_idle_with_hints(eax, ecx);
- if (!static_cpu_has(X86_FEATURE_ARAT) && tick)
- tick_broadcast_exit();
-
return index;
}
@@ -1227,6 +1210,20 @@ static bool __init intel_idle_acpi_cst_extract(void)
return false;
}
+static bool __init intel_idle_state_needs_timer_stop(struct cpuidle_state *state)
+{
+ unsigned long eax = flg2MWAIT(state->flags);
+
+ if (boot_cpu_has(X86_FEATURE_ARAT))
+ return false;
+
+ /*
+ * Switch over to one-shot tick broadcast if the target C-state
+ * is deeper than C1.
+ */
+ return !!((eax >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK);
+}
+
static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
{
int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count);
@@ -1269,6 +1266,9 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
if (disabled_states_mask & BIT(cstate))
state->flags |= CPUIDLE_FLAG_OFF;
+ if (intel_idle_state_needs_timer_stop(state))
+ state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+
state->enter = intel_idle;
state->enter_s2idle = intel_idle_s2idle;
}
@@ -1507,6 +1507,9 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
!(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
+ if (intel_idle_state_needs_timer_stop(&drv->states[drv->state_count]))
+ drv->states[drv->state_count].flags |= CPUIDLE_FLAG_TIMER_STOP;
+
drv->state_count++;
}