cpuidle: Allow idle states to be disabled by default
In certain situations it may be useful to prevent some idle states from being used by default while allowing user space to enable them later on. For this purpose, introduce a new state flag, CPUIDLE_FLAG_OFF, to mark idle states that should be disabled by default, make the core set CPUIDLE_STATE_DISABLED_BY_USER for those states at the initialization time and add a new state attribute in sysfs, "default_status", to inform user space of the initial status of the given idle state ("disabled" if CPUIDLE_FLAG_OFF is set for it, "enabled" otherwise). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -196,6 +196,12 @@ Description:
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does not reflect it. Likewise, if one enables a deep state but a
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lighter state still is disabled, then this has no effect.
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What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/default_status
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Date: December 2019
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KernelVersion: v5.6
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Contact: Linux power management list <linux-pm@vger.kernel.org>
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Description:
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(RO) The default status of this state, "enabled" or "disabled".
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What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/residency
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Date: March 2014
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@ -506,6 +506,9 @@ object corresponding to it, as follows:
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``disable``
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Whether or not this idle state is disabled.
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``default_status``
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The default status of this state, "enabled" or "disabled".
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``latency``
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Exit latency of the idle state in microseconds.
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@ -572,10 +572,14 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
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if (!try_module_get(drv->owner))
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return -EINVAL;
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for (i = 0; i < drv->state_count; i++)
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for (i = 0; i < drv->state_count; i++) {
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if (drv->states[i].flags & CPUIDLE_FLAG_UNUSABLE)
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dev->states_usage[i].disable |= CPUIDLE_STATE_DISABLED_BY_DRIVER;
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if (drv->states[i].flags & CPUIDLE_FLAG_OFF)
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dev->states_usage[i].disable |= CPUIDLE_STATE_DISABLED_BY_USER;
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}
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per_cpu(cpuidle_devices, dev->cpu) = dev;
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list_add(&dev->device_list, &cpuidle_detected_devices);
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@ -327,6 +327,14 @@ static ssize_t store_state_disable(struct cpuidle_state *state,
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return size;
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}
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static ssize_t show_state_default_status(struct cpuidle_state *state,
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struct cpuidle_state_usage *state_usage,
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char *buf)
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{
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return sprintf(buf, "%s\n",
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state->flags & CPUIDLE_FLAG_OFF ? "disabled" : "enabled");
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}
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define_one_state_ro(name, show_state_name);
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define_one_state_ro(desc, show_state_desc);
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define_one_state_ro(latency, show_state_exit_latency);
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@ -337,6 +345,7 @@ define_one_state_ro(time, show_state_time);
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define_one_state_rw(disable, show_state_disable, store_state_disable);
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define_one_state_ro(above, show_state_above);
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define_one_state_ro(below, show_state_below);
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define_one_state_ro(default_status, show_state_default_status);
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static struct attribute *cpuidle_state_default_attrs[] = {
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&attr_name.attr,
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@ -349,6 +358,7 @@ static struct attribute *cpuidle_state_default_attrs[] = {
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&attr_disable.attr,
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&attr_above.attr,
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&attr_below.attr,
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&attr_default_status.attr,
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NULL
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};
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@ -77,6 +77,7 @@ struct cpuidle_state {
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#define CPUIDLE_FLAG_COUPLED BIT(1) /* state applies to multiple cpus */
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#define CPUIDLE_FLAG_TIMER_STOP BIT(2) /* timer is stopped on this state */
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#define CPUIDLE_FLAG_UNUSABLE BIT(3) /* avoid using this state */
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#define CPUIDLE_FLAG_OFF BIT(4) /* disable this state by default */
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struct cpuidle_device_kobj;
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struct cpuidle_state_kobj;
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