#include "power.h"
-const char *const pm_states[PM_SUSPEND_MAX] = {
- [PM_SUSPEND_FREEZE] = "freeze",
- [PM_SUSPEND_STANDBY] = "standby",
- [PM_SUSPEND_MEM] = "mem",
+struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {
+ [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;
+static const struct platform_freeze_ops *freeze_ops;
static bool need_suspend_ops(suspend_state_t state)
{
static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
static bool suspend_freeze_wake;
+void freeze_set_ops(const struct platform_freeze_ops *ops)
+{
+ lock_system_sleep();
+ freeze_ops = ops;
+ unlock_system_sleep();
+}
+
static void freeze_begin(void)
{
suspend_freeze_wake = false;
static void freeze_enter(void)
{
+ cpuidle_use_deepest_state(true);
cpuidle_resume();
wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
cpuidle_pause();
+ cpuidle_use_deepest_state(false);
}
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);
+}
+
+/*
+ * If this is set, the "mem" label always corresponds to the deepest sleep state
+ * available, the "standby" label corresponds to the second deepest sleep state
+ * available (if any), and the "freeze" label corresponds to the remaining
+ * available sleep state (if there is one).
+ */
+static bool relative_states;
+
+static int __init sleep_states_setup(char *str)
+{
+ relative_states = !strncmp(str, "1", 1);
+ if (relative_states) {
+ pm_states[PM_SUSPEND_MEM].state = PM_SUSPEND_FREEZE;
+ pm_states[PM_SUSPEND_FREEZE].state = 0;
+ }
+ return 1;
+}
+
+__setup("relative_sleep_states=", sleep_states_setup);
+
/**
* 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;
+ int j = PM_SUSPEND_MAX - 1;
+
lock_system_sleep();
+
suspend_ops = ops;
+ for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--)
+ if (valid_state(i))
+ pm_states[j--].state = i;
+ else if (!relative_states)
+ pm_states[j--].state = 0;
+
+ pm_states[j--].state = PM_SUSPEND_FREEZE;
+ while (j >= PM_SUSPEND_MIN)
+ pm_states[j--].state = 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.
*
if (error)
goto Finish;
+ trace_suspend_resume(TPS("freeze_processes"), 0, true);
error = suspend_freeze_processes();
+ trace_suspend_resume(TPS("freeze_processes"), 0, false);
if (!error)
return 0;
* all the devices are suspended.
*/
if (state == PM_SUSPEND_FREEZE) {
+ trace_suspend_resume(TPS("machine_suspend"), state, true);
freeze_enter();
+ trace_suspend_resume(TPS("machine_suspend"), state, false);
goto Platform_wake;
}
if (!error) {
*wakeup = pm_wakeup_pending();
if (!(suspend_test(TEST_CORE) || *wakeup)) {
+ trace_suspend_resume(TPS("machine_suspend"),
+ state, true);
error = suspend_ops->enter(state);
+ trace_suspend_resume(TPS("machine_suspend"),
+ state, false);
events_check_enabled = false;
}
syscore_resume();
if (need_suspend_ops(state) && !suspend_ops)
return -ENOSYS;
- trace_machine_suspend(state);
if (need_suspend_ops(state) && suspend_ops->begin) {
error = suspend_ops->begin(state);
if (error)
goto Close;
+ } else if (state == PM_SUSPEND_FREEZE && freeze_ops->begin) {
+ error = freeze_ops->begin();
+ if (error)
+ goto Close;
}
suspend_console();
suspend_test_start();
Close:
if (need_suspend_ops(state) && suspend_ops->end)
suspend_ops->end();
- trace_machine_suspend(PWR_EVENT_EXIT);
+ else if (state == PM_SUSPEND_FREEZE && freeze_ops->end)
+ freeze_ops->end();
+
return error;
Recover_platform:
{
int error;
- if (!valid_state(state))
- return -ENODEV;
-
+ trace_suspend_resume(TPS("suspend_enter"), state, true);
+ 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;
if (state == PM_SUSPEND_FREEZE)
freeze_begin();
+ trace_suspend_resume(TPS("sync_filesystems"), 0, true);
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
+ trace_suspend_resume(TPS("sync_filesystems"), 0, false);
- pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
+ pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);
error = suspend_prepare(state);
if (error)
goto Unlock;
if (suspend_test(TEST_FREEZER))
goto Finish;
- pr_debug("PM: Entering %s sleep\n", pm_states[state]);
+ trace_suspend_resume(TPS("suspend_enter"), state, false);
+ pr_debug("PM: Entering %s sleep\n", pm_states[state].label);
pm_restrict_gfp_mask();
error = suspend_devices_and_enter(state);
pm_restore_gfp_mask();
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