*
*/
+#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/pm.h>
-
+#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/resume-trace.h>
+#include <linux/freezer.h>
+#include <linux/vmstat.h>
#include "power.h"
-/*This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
+BLOCKING_NOTIFIER_HEAD(pm_chain_head);
+
+DEFINE_MUTEX(pm_mutex);
-DECLARE_MUTEX(pm_sem);
+#ifdef CONFIG_SUSPEND
-struct pm_ops *pm_ops;
-suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
+/* This is just an arbitrary number */
+#define FREE_PAGE_NUMBER (100)
+
+static struct platform_suspend_ops *suspend_ops;
/**
- * pm_set_ops - Set the global power method table.
+ * suspend_set_ops - Set the global suspend method table.
* @ops: Pointer to ops structure.
*/
-void pm_set_ops(struct pm_ops * ops)
+void suspend_set_ops(struct platform_suspend_ops *ops)
{
- down(&pm_sem);
- pm_ops = ops;
- up(&pm_sem);
+ mutex_lock(&pm_mutex);
+ suspend_ops = ops;
+ mutex_unlock(&pm_mutex);
}
+/**
+ * suspend_valid_only_mem - generic memory-only valid callback
+ *
+ * Platform drivers that implement mem suspend only and only need
+ * to check for that in their .valid callback can use this instead
+ * of rolling their own .valid callback.
+ */
+int suspend_valid_only_mem(suspend_state_t state)
+{
+ return state == PM_SUSPEND_MEM;
+}
/**
* suspend_prepare - Do prep work before entering low-power state.
- * @state: State we're entering.
*
- * This is common code that is called for each state that we're
- * entering. Allocate a console, stop all processes, then make sure
- * the platform can enter the requested state.
+ * This is common code that is called for each state that we're entering.
+ * Run suspend notifiers, allocate a console and stop all processes.
*/
-
-static int suspend_prepare(suspend_state_t state)
+static int suspend_prepare(void)
{
- int error = 0;
+ int error;
unsigned int free_pages;
- if (!pm_ops || !pm_ops->enter)
+ if (!suspend_ops || !suspend_ops->enter)
return -EPERM;
- pm_prepare_console();
-
- disable_nonboot_cpus();
+ error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+ if (error)
+ goto Finish;
- if (num_online_cpus() != 1) {
- error = -EPERM;
- goto Enable_cpu;
- }
+ pm_prepare_console();
if (freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
- if ((free_pages = nr_free_pages()) < FREE_PAGE_NUMBER) {
+ free_pages = global_page_state(NR_FREE_PAGES);
+ if (free_pages < FREE_PAGE_NUMBER) {
pr_debug("PM: free some memory\n");
shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
if (nr_free_pages() < FREE_PAGE_NUMBER) {
error = -ENOMEM;
printk(KERN_ERR "PM: No enough memory\n");
- goto Thaw;
}
}
+ if (!error)
+ return 0;
- if (pm_ops->prepare) {
- if ((error = pm_ops->prepare(state)))
- goto Thaw;
- }
-
- if ((error = device_suspend(PMSG_SUSPEND))) {
- printk(KERN_ERR "Some devices failed to suspend\n");
- goto Finish;
- }
- return 0;
- Finish:
- if (pm_ops->finish)
- pm_ops->finish(state);
Thaw:
thaw_processes();
- Enable_cpu:
- enable_nonboot_cpus();
pm_restore_console();
+ Finish:
+ pm_notifier_call_chain(PM_POST_SUSPEND);
return error;
}
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
+{
+ local_irq_disable();
+}
+/* default implementation */
+void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
+{
+ local_irq_enable();
+}
+
+/**
+ * suspend_enter - enter the desired system sleep state.
+ * @state: state to enter
+ *
+ * This function should be called after devices have been suspended.
+ */
static int suspend_enter(suspend_state_t state)
{
int error = 0;
- unsigned long flags;
- local_irq_save(flags);
+ arch_suspend_disable_irqs();
+ BUG_ON(!irqs_disabled());
if ((error = device_power_down(PMSG_SUSPEND))) {
printk(KERN_ERR "Some devices failed to power down\n");
goto Done;
}
- error = pm_ops->enter(state);
+ error = suspend_ops->enter(state);
device_power_up();
Done:
- local_irq_restore(flags);
+ arch_suspend_enable_irqs();
+ BUG_ON(irqs_disabled());
return error;
}
+/**
+ * suspend_devices_and_enter - suspend devices and enter the desired system sleep
+ * state.
+ * @state: state to enter
+ */
+int suspend_devices_and_enter(suspend_state_t state)
+{
+ int error;
+
+ if (!suspend_ops)
+ return -ENOSYS;
+
+ if (suspend_ops->set_target) {
+ error = suspend_ops->set_target(state);
+ if (error)
+ return error;
+ }
+ suspend_console();
+ error = device_suspend(PMSG_SUSPEND);
+ if (error) {
+ printk(KERN_ERR "Some devices failed to suspend\n");
+ goto Resume_console;
+ }
+ if (suspend_ops->prepare) {
+ error = suspend_ops->prepare();
+ if (error)
+ goto Resume_devices;
+ }
+ error = disable_nonboot_cpus();
+ if (!error)
+ suspend_enter(state);
+
+ enable_nonboot_cpus();
+ if (suspend_ops->finish)
+ suspend_ops->finish();
+ Resume_devices:
+ device_resume();
+ Resume_console:
+ resume_console();
+ return error;
+}
/**
* suspend_finish - Do final work before exiting suspend sequence.
- * @state: State we're coming out of.
*
* Call platform code to clean up, restart processes, and free the
* console that we've allocated. This is not called for suspend-to-disk.
*/
-
-static void suspend_finish(suspend_state_t state)
+static void suspend_finish(void)
{
- device_resume();
- if (pm_ops && pm_ops->finish)
- pm_ops->finish(state);
thaw_processes();
- enable_nonboot_cpus();
pm_restore_console();
+ pm_notifier_call_chain(PM_POST_SUSPEND);
}
-static char *pm_states[PM_SUSPEND_MAX] = {
+static const char * const pm_states[PM_SUSPEND_MAX] = {
[PM_SUSPEND_STANDBY] = "standby",
[PM_SUSPEND_MEM] = "mem",
-#ifdef CONFIG_SOFTWARE_SUSPEND
- [PM_SUSPEND_DISK] = "disk",
-#endif
};
static inline int valid_state(suspend_state_t state)
{
- /* Suspend-to-disk does not really need low-level support.
- * It can work with reboot if needed. */
- if (state == PM_SUSPEND_DISK)
- return 1;
-
- if (pm_ops && pm_ops->valid && !pm_ops->valid(state))
+ /* All states need lowlevel support and need to be valid
+ * to the lowlevel implementation, no valid callback
+ * implies that none are valid. */
+ if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
return 0;
return 1;
}
* Then, do the setup for suspend, enter the state, and cleaup (after
* we've woken up).
*/
-
static int enter_state(suspend_state_t state)
{
int error;
if (!valid_state(state))
return -ENODEV;
- if (down_trylock(&pm_sem))
+ if (!mutex_trylock(&pm_mutex))
return -EBUSY;
- if (state == PM_SUSPEND_DISK) {
- error = pm_suspend_disk();
- goto Unlock;
- }
-
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
- if ((error = suspend_prepare(state)))
+ if ((error = suspend_prepare()))
goto Unlock;
pr_debug("PM: Entering %s sleep\n", pm_states[state]);
- error = suspend_enter(state);
+ error = suspend_devices_and_enter(state);
pr_debug("PM: Finishing wakeup.\n");
- suspend_finish(state);
+ suspend_finish();
Unlock:
- up(&pm_sem);
+ mutex_unlock(&pm_mutex);
return error;
}
-/*
- * This is main interface to the outside world. It needs to be
- * called from process context.
- */
-int software_suspend(void)
-{
- return enter_state(PM_SUSPEND_DISK);
-}
-
/**
* pm_suspend - Externally visible function for suspending system.
- * @state: Enumarted value of state to enter.
+ * @state: Enumerated value of state to enter.
*
* Determine whether or not value is within range, get state
* structure, and enter (above).
return -EINVAL;
}
+EXPORT_SYMBOL(pm_suspend);
+#endif /* CONFIG_SUSPEND */
decl_subsys(power,NULL,NULL);
* proper enumerated value, and initiates a suspend transition.
*/
-static ssize_t state_show(struct subsystem * subsys, char * buf)
+static ssize_t state_show(struct kset *kset, char *buf)
{
+ char *s = buf;
+#ifdef CONFIG_SUSPEND
int i;
- char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
- s += sprintf(s,"\n");
+#endif
+#ifdef CONFIG_HIBERNATION
+ s += sprintf(s, "%s\n", "disk");
+#else
+ if (s != buf)
+ /* convert the last space to a newline */
+ *(s-1) = '\n';
+#endif
return (s - buf);
}
-static ssize_t state_store(struct subsystem * subsys, const char * buf, size_t n)
+static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
{
+#ifdef CONFIG_SUSPEND
suspend_state_t state = PM_SUSPEND_STANDBY;
- char ** s;
+ const char * const *s;
+#endif
char *p;
- int error;
int len;
+ int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
+ /* First, check if we are requested to hibernate */
+ if (len == 4 && !strncmp(buf, "disk", len)) {
+ error = hibernate();
+ goto Exit;
+ }
+
+#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
- if (*s && !strncmp(buf, *s, len))
+ if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
- if (*s)
+ if (state < PM_SUSPEND_MAX && *s)
error = enter_state(state);
- else
- error = -EINVAL;
+#endif
+
+ Exit:
return error ? error : n;
}
power_attr(state);
+#ifdef CONFIG_PM_TRACE
+int pm_trace_enabled;
+
+static ssize_t pm_trace_show(struct kset *kset, char *buf)
+{
+ return sprintf(buf, "%d\n", pm_trace_enabled);
+}
+
+static ssize_t
+pm_trace_store(struct kset *kset, const char *buf, size_t n)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) == 1) {
+ pm_trace_enabled = !!val;
+ return n;
+ }
+ return -EINVAL;
+}
+
+power_attr(pm_trace);
+
+static struct attribute * g[] = {
+ &state_attr.attr,
+ &pm_trace_attr.attr,
+ NULL,
+};
+#else
static struct attribute * g[] = {
&state_attr.attr,
NULL,
};
+#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,
{
int error = subsystem_register(&power_subsys);
if (!error)
- error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
+ error = sysfs_create_group(&power_subsys.kobj,&attr_group);
return error;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff