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Date: Fri, 23 May 2014 01:23:26 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM list <linux-pm@...r.kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] PM / sleep: Use valid_state() for platform-dependent sleep states only
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Use the observation that, for platform-dependent sleep states
(PM_SUSPEND_STANDBY, PM_SUSPEND_MEM), a given state is either
always supported or always unsupported and store that information
in pm_states[] instead of calling valid_state() every time we
need to check it.
Also do not use valid_state() for PM_SUSPEND_FREEZE, which is always
valid, and move the pm_test_level validity check for PM_SUSPEND_FREEZE
directly into enter_state().
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
kernel/power/main.c | 9 ++++----
kernel/power/power.h | 2 -
kernel/power/suspend.c | 46 ++++++++++++++++++++++++--------------------
kernel/power/suspend_test.c | 2 -
4 files changed, 32 insertions(+), 27 deletions(-)
Index: linux-pm/kernel/power/main.c
===================================================================
--- linux-pm.orig/kernel/power/main.c
+++ linux-pm/kernel/power/main.c
@@ -296,7 +296,7 @@ static ssize_t state_show(struct kobject
int i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
- if (valid_state(i))
+ if (pm_states[i].state)
s += sprintf(s,"%s ", pm_states[i].label);
#endif
@@ -328,8 +328,9 @@ static suspend_state_t decode_state(cons
#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)
- if (len == strlen(s->label) && !strncmp(buf, s->label, len))
- return state;
+ if (s->state && len == strlen(s->label)
+ && !strncmp(buf, s->label, len))
+ return s->state;
#endif
return PM_SUSPEND_ON;
@@ -447,7 +448,7 @@ static ssize_t autosleep_show(struct kob
#ifdef CONFIG_SUSPEND
if (state < PM_SUSPEND_MAX)
- return sprintf(buf, "%s\n", valid_state(state) ?
+ return sprintf(buf, "%s\n", pm_states[state].state ?
pm_states[state].label : "error");
#endif
#ifdef CONFIG_HIBERNATION
Index: linux-pm/kernel/power/power.h
===================================================================
--- linux-pm.orig/kernel/power/power.h
+++ linux-pm/kernel/power/power.h
@@ -186,14 +186,12 @@ struct pm_sleep_state {
/* kernel/power/suspend.c */
extern struct pm_sleep_state pm_states[];
-extern bool valid_state(suspend_state_t state);
extern int suspend_devices_and_enter(suspend_state_t state);
#else /* !CONFIG_SUSPEND */
static inline int suspend_devices_and_enter(suspend_state_t state)
{
return -ENOSYS;
}
-static inline bool valid_state(suspend_state_t state) { return false; }
#endif /* !CONFIG_SUSPEND */
#ifdef CONFIG_PM_TEST_SUSPEND
Index: linux-pm/kernel/power/suspend_test.c
===================================================================
--- linux-pm.orig/kernel/power/suspend_test.c
+++ linux-pm/kernel/power/suspend_test.c
@@ -162,7 +162,7 @@ static int __init test_suspend(void)
/* PM is initialized by now; is that state testable? */
if (test_state == PM_SUSPEND_ON)
goto done;
- if (!valid_state(test_state)) {
+ if (!pm_states[test_state].state) {
printk(warn_bad_state, pm_states[test_state].label);
goto done;
}
Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -88,30 +88,28 @@ void suspend_set_ops(const struct platfo
}
EXPORT_SYMBOL_GPL(suspend_set_ops);
-bool valid_state(suspend_state_t state)
+static bool valid_state(suspend_state_t state)
{
- if (state == PM_SUSPEND_FREEZE) {
-#ifdef CONFIG_PM_DEBUG
- if (pm_test_level != TEST_NONE &&
- pm_test_level != TEST_FREEZER &&
- pm_test_level != TEST_DEVICES &&
- pm_test_level != TEST_PLATFORM) {
- printk(KERN_WARNING "Unsupported pm_test mode for "
- "freeze state, please choose "
- "none/freezer/devices/platform.\n");
- return false;
- }
-#endif
- return true;
- }
/*
- * PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel
- * support and need to be valid to the lowlevel
+ * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level
+ * support and need to be valid to the low level
* implementation, no valid callback implies that none are valid.
*/
return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
}
+static int __init pm_suspend_states_init(void)
+{
+ suspend_state_t i;
+
+ for (i = PM_SUSPEND_STANDBY; i <= PM_SUSPEND_MEM; i++)
+ if (!valid_state(i))
+ pm_states[i].state = 0;
+
+ return 0;
+}
+fs_initcall(pm_suspend_states_init);
+
/**
* suspend_valid_only_mem - Generic memory-only valid callback.
*
@@ -345,9 +343,17 @@ static int enter_state(suspend_state_t s
{
int error;
- if (!valid_state(state))
- return -ENODEV;
-
+ if (state == PM_SUSPEND_FREEZE) {
+#ifdef CONFIG_PM_DEBUG
+ if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
+ pr_warning("PM: Unsupported test mode for freeze state,"
+ "please choose none/freezer/devices/platform.\n");
+ return -EAGAIN;
+ }
+#endif
+ } else if (!valid_state(state)) {
+ return -EINVAL;
+ }
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
--
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