diff options
Diffstat (limited to 'kernel/power/suspend.c')
| -rw-r--r-- | kernel/power/suspend.c | 90 |
1 files changed, 77 insertions, 13 deletions
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index c347e3ce3a55..882f80e01240 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -26,8 +26,10 @@ #include <linux/suspend.h> #include <linux/syscore_ops.h> #include <linux/ftrace.h> +#include <linux/rtc.h> #include <trace/events/power.h> #include <linux/compiler.h> +#include <linux/wakeup_reason.h> #include "power.h" @@ -37,7 +39,9 @@ const char *pm_states[PM_SUSPEND_MAX]; static const struct platform_suspend_ops *suspend_ops; static const struct platform_freeze_ops *freeze_ops; static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); -static bool suspend_freeze_wake; + +enum freeze_state __read_mostly suspend_freeze_state; +static DEFINE_SPINLOCK(suspend_freeze_lock); void freeze_set_ops(const struct platform_freeze_ops *ops) { @@ -48,22 +52,49 @@ void freeze_set_ops(const struct platform_freeze_ops *ops) static void freeze_begin(void) { - suspend_freeze_wake = false; + suspend_freeze_state = FREEZE_STATE_NONE; } static void freeze_enter(void) { - cpuidle_use_deepest_state(true); + spin_lock_irq(&suspend_freeze_lock); + if (pm_wakeup_pending()) + goto out; + + suspend_freeze_state = FREEZE_STATE_ENTER; + spin_unlock_irq(&suspend_freeze_lock); + + get_online_cpus(); cpuidle_resume(); - wait_event(suspend_freeze_wait_head, suspend_freeze_wake); + + /* Push all the CPUs into the idle loop. */ + wake_up_all_idle_cpus(); + pr_debug("PM: suspend-to-idle\n"); + /* Make the current CPU wait so it can enter the idle loop too. */ + wait_event(suspend_freeze_wait_head, + suspend_freeze_state == FREEZE_STATE_WAKE); + pr_debug("PM: resume from suspend-to-idle\n"); + cpuidle_pause(); - cpuidle_use_deepest_state(false); + put_online_cpus(); + + spin_lock_irq(&suspend_freeze_lock); + + out: + suspend_freeze_state = FREEZE_STATE_NONE; + spin_unlock_irq(&suspend_freeze_lock); } void freeze_wake(void) { - suspend_freeze_wake = true; - wake_up(&suspend_freeze_wait_head); + unsigned long flags; + + spin_lock_irqsave(&suspend_freeze_lock, flags); + if (suspend_freeze_state > FREEZE_STATE_NONE) { + suspend_freeze_state = FREEZE_STATE_WAKE; + wake_up(&suspend_freeze_wait_head); + } + spin_unlock_irqrestore(&suspend_freeze_lock, flags); } EXPORT_SYMBOL_GPL(freeze_wake); @@ -225,16 +256,18 @@ static int suspend_test(int level) */ static int suspend_prepare(suspend_state_t state) { - int error; + int error, nr_calls = 0; if (!sleep_state_supported(state)) return -EPERM; pm_prepare_console(); - error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); - if (error) + error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls); + if (error) { + nr_calls--; goto Finish; + } trace_suspend_resume(TPS("freeze_processes"), 0, true); error = suspend_freeze_processes(); @@ -245,7 +278,7 @@ static int suspend_prepare(suspend_state_t state) suspend_stats.failed_freeze++; dpm_save_failed_step(SUSPEND_FREEZE); Finish: - pm_notifier_call_chain(PM_POST_SUSPEND); + __pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL); pm_restore_console(); return error; } @@ -271,7 +304,8 @@ void __weak arch_suspend_enable_irqs(void) */ static int suspend_enter(suspend_state_t state, bool *wakeup) { - int error; + char suspend_abort[MAX_SUSPEND_ABORT_LEN]; + int error, last_dev; error = platform_suspend_prepare(state); if (error) @@ -279,7 +313,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) error = dpm_suspend_late(PMSG_SUSPEND); if (error) { + last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; + last_dev %= REC_FAILED_NUM; printk(KERN_ERR "PM: late suspend of devices failed\n"); + log_suspend_abort_reason("%s device failed to power down", + suspend_stats.failed_devs[last_dev]); goto Platform_finish; } error = platform_suspend_prepare_late(state); @@ -288,7 +326,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) error = dpm_suspend_noirq(PMSG_SUSPEND); if (error) { + last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; + last_dev %= REC_FAILED_NUM; printk(KERN_ERR "PM: noirq suspend of devices failed\n"); + log_suspend_abort_reason("noirq suspend of %s device failed", + suspend_stats.failed_devs[last_dev]); goto Platform_early_resume; } error = platform_suspend_prepare_noirq(state); @@ -312,8 +354,10 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) } error = disable_nonboot_cpus(); - if (error || suspend_test(TEST_CPUS)) + if (error || suspend_test(TEST_CPUS)) { + log_suspend_abort_reason("Disabling non-boot cpus failed"); goto Enable_cpus; + } arch_suspend_disable_irqs(); BUG_ON(!irqs_disabled()); @@ -328,6 +372,11 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) trace_suspend_resume(TPS("machine_suspend"), state, false); events_check_enabled = false; + } else if (*wakeup) { + pm_get_active_wakeup_sources(suspend_abort, + MAX_SUSPEND_ABORT_LEN); + log_suspend_abort_reason(suspend_abort); + error = -EBUSY; } syscore_resume(); } @@ -374,6 +423,7 @@ int suspend_devices_and_enter(suspend_state_t state) error = dpm_suspend_start(PMSG_SUSPEND); if (error) { pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); + log_suspend_abort_reason("Some devices failed to suspend, or early wake event detected"); goto Recover_platform; } suspend_test_finish("suspend devices"); @@ -472,6 +522,18 @@ static int enter_state(suspend_state_t state) return error; } +static void pm_suspend_marker(char *annotation) +{ + struct timespec ts; + struct tm tm; + + getnstimeofday(&ts); + time_to_tm(ts.tv_sec, 0, &tm); + pr_info("PM: suspend %s %ld-%02d-%02d %02d:%02d:%02d.%09lu UTC\n", + annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); +} + /** * pm_suspend - Externally visible function for suspending the system. * @state: System sleep state to enter. @@ -486,6 +548,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + pm_suspend_marker("entry"); error = enter_state(state); if (error) { suspend_stats.fail++; @@ -493,6 +556,7 @@ int pm_suspend(suspend_state_t state) } else { suspend_stats.success++; } + pm_suspend_marker("exit"); return error; } EXPORT_SYMBOL(pm_suspend); |