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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.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 6fbd94f85fa5..d55606608ac8 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -63,6 +63,7 @@ static struct cpuidle_driver intel_idle_driver = {
};
/* intel_idle.max_cstate=0 disables driver */
static int max_cstate = CPUIDLE_STATE_MAX - 1;
+static unsigned int disabled_states_mask;
static unsigned int mwait_substates;
@@ -1234,6 +1235,9 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
if (cx->type > ACPI_STATE_C2)
state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
+ if (disabled_states_mask & BIT(cstate))
+ state->flags |= CPUIDLE_FLAG_OFF;
+
state->enter = intel_idle;
state->enter_s2idle = intel_idle_s2idle;
}
@@ -1466,9 +1470,10 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
/* Structure copy. */
drv->states[drv->state_count] = cpuidle_state_table[cstate];
- if ((icpu->use_acpi || force_use_acpi) &&
- intel_idle_off_by_default(mwait_hint) &&
- !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE))
+ if ((disabled_states_mask & BIT(drv->state_count)) ||
+ ((icpu->use_acpi || force_use_acpi) &&
+ intel_idle_off_by_default(mwait_hint) &&
+ !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)))
drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
drv->state_count++;
@@ -1487,6 +1492,10 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv)
{
cpuidle_poll_state_init(drv);
+
+ if (disabled_states_mask & BIT(0))
+ drv->states[0].flags |= CPUIDLE_FLAG_OFF;
+
drv->state_count = 1;
if (icpu)
@@ -1667,3 +1676,11 @@ device_initcall(intel_idle_init);
* is the easiest way (currently) to continue doing that.
*/
module_param(max_cstate, int, 0444);
+/*
+ * The positions of the bits that are set in this number are the indices of the
+ * idle states to be disabled by default (as reflected by the names of the
+ * corresponding idle state directories in sysfs, "state0", "state1" ...
+ * "state<i>" ..., where <i> is the index of the given state).
+ */
+module_param_named(states_off, disabled_states_mask, uint, 0444);
+MODULE_PARM_DESC(states_off, "Mask of disabled idle states");