From 43e8317b0bba1d6eb85f38a4a233d82d7c20d732 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 26 May 2014 13:40:53 +0200 Subject: [PATCH] PM / sleep: Use valid_state() for platform-dependent sleep states only 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 --- kernel/power/main.c | 9 +++--- kernel/power/power.h | 2 -- kernel/power/suspend.c | 60 ++++++++++++++++++------------------- kernel/power/suspend_test.c | 2 +- 4 files changed, 36 insertions(+), 37 deletions(-) diff --git a/kernel/power/main.c b/kernel/power/main.c index 8e818432253c..9f51f0ab3d86 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -296,7 +296,7 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, suspend_state_t 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(const char *buf, size_t n) #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 kobject *kobj, #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 diff --git a/kernel/power/power.h b/kernel/power/power.h index 99539c5da844..c60f13b5270a 100644 --- a/kernel/power/power.h +++ b/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 diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 5d93b138a2d4..00aca60904b0 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -32,9 +32,9 @@ #include "power.h" struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = { - [PM_SUSPEND_FREEZE] = { "freeze", PM_SUSPEND_FREEZE }, - [PM_SUSPEND_STANDBY] = { "standby", PM_SUSPEND_STANDBY }, - [PM_SUSPEND_MEM] = { "mem", PM_SUSPEND_MEM }, + [PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE }, + [PM_SUSPEND_STANDBY] = { .label = "standby", }, + [PM_SUSPEND_MEM] = { .label = "mem", }, }; static const struct platform_suspend_ops *suspend_ops; @@ -68,42 +68,34 @@ void freeze_wake(void) } EXPORT_SYMBOL_GPL(freeze_wake); +static bool valid_state(suspend_state_t state) +{ + /* + * 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); +} + /** * suspend_set_ops - Set the global suspend method table. * @ops: Suspend operations to use. */ void suspend_set_ops(const struct platform_suspend_ops *ops) { + suspend_state_t i; + lock_system_sleep(); + suspend_ops = ops; + for (i = PM_SUSPEND_STANDBY; i <= PM_SUSPEND_MEM; i++) + pm_states[i].state = valid_state(i) ? i : 0; + unlock_system_sleep(); } EXPORT_SYMBOL_GPL(suspend_set_ops); -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 - * implementation, no valid callback implies that none are valid. - */ - return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); -} - /** * suspend_valid_only_mem - Generic memory-only valid callback. * @@ -330,9 +322,17 @@ static int enter_state(suspend_state_t state) { 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; diff --git a/kernel/power/suspend_test.c b/kernel/power/suspend_test.c index d4e3ab167a73..269b097e78ea 100644 --- a/kernel/power/suspend_test.c +++ b/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; } -- 2.20.1