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PM: cpuidle/suspend: Add s2idle usage and time state attributes

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Add a new attribute group called "s2idle" under the sysfs directory
of each cpuidle state that supports the ->enter_s2idle callback
and put two new attributes, "usage" and "time", into that group to
represent the number of times the given state was requested for
suspend-to-idle and the total time spent in suspend-to-idle after
requesting that state, respectively.

That will allow diagnostic information related to suspend-to-idle
to be collected without enabling advanced debug features and
analyzing dmesg output.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2018-03-14 12:27:21 +01:00
parent 8919d779f1
commit 64bdff6980
4 changed files with 92 additions and 0 deletions
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54
drivers/cpuidle/sysfs.c
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@@ -330,6 +330,58 @@ struct cpuidle_state_kobj {
struct kobject kobj;
};
#ifdef CONFIG_SUSPEND
#define define_show_state_s2idle_ull_function(_name) \
static ssize_t show_state_s2idle_##_name(struct cpuidle_state *state, \
struct cpuidle_state_usage *state_usage, \
char *buf) \
{ \
return sprintf(buf, "%llu\n", state_usage->s2idle_##_name);\
}
define_show_state_s2idle_ull_function(usage);
define_show_state_s2idle_ull_function(time);
#define define_one_state_s2idle_ro(_name, show) \
static struct cpuidle_state_attr attr_s2idle_##_name = \
__ATTR(_name, 0444, show, NULL)
define_one_state_s2idle_ro(usage, show_state_s2idle_usage);
define_one_state_s2idle_ro(time, show_state_s2idle_time);
static struct attribute *cpuidle_state_s2idle_attrs[] = {
&attr_s2idle_usage.attr,
&attr_s2idle_time.attr,
NULL
};
static const struct attribute_group cpuidle_state_s2idle_group = {
.name = "s2idle",
.attrs = cpuidle_state_s2idle_attrs,
};
static void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
{
int ret;
if (!kobj->state->enter_s2idle)
return;
ret = sysfs_create_group(&kobj->kobj, &cpuidle_state_s2idle_group);
if (ret)
pr_debug("%s: sysfs attribute group not created\n", __func__);
}
static void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj)
{
if (kobj->state->enter_s2idle)
sysfs_remove_group(&kobj->kobj, &cpuidle_state_s2idle_group);
}
#else
static inline void cpuidle_add_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
static inline void cpuidle_remove_s2idle_attr_group(struct cpuidle_state_kobj *kobj) { }
#endif /* CONFIG_SUSPEND */
#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
@@ -383,6 +435,7 @@ static struct kobj_type ktype_state_cpuidle = {
static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
{
cpuidle_remove_s2idle_attr_group(device->kobjs[i]);
kobject_put(&device->kobjs[i]->kobj);
wait_for_completion(&device->kobjs[i]->kobj_unregister);
kfree(device->kobjs[i]);
@@ -417,6 +470,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
kfree(kobj);
goto error_state;
}
cpuidle_add_s2idle_attr_group(kobj);
kobject_uevent(&kobj->kobj, KOBJ_ADD);
device->kobjs[i] = kobj;
}