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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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PM: merge device power-management source files
This patch (as993) merges the suspend.c and resume.c files in drivers/base/power into main.c, making some public symbols private. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
Greg Kroah-Hartman
parent
6d66f5cd26
commit
cd59abfcc4
@ -1,5 +1,5 @@
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obj-y := shutdown.o
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obj-$(CONFIG_PM_SLEEP) += main.o suspend.o resume.o sysfs.o
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obj-$(CONFIG_PM_SLEEP) += main.o sysfs.o
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obj-$(CONFIG_PM_TRACE) += trace.o
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ifeq ($(CONFIG_DEBUG_DRIVER),y)
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@ -20,19 +20,24 @@
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*/
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#include <linux/device.h>
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#include <linux/kallsyms.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/resume-trace.h>
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#include "../base.h"
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#include "power.h"
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LIST_HEAD(dpm_active);
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LIST_HEAD(dpm_off);
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LIST_HEAD(dpm_off_irq);
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static LIST_HEAD(dpm_off);
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static LIST_HEAD(dpm_off_irq);
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DEFINE_MUTEX(dpm_mtx);
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DEFINE_MUTEX(dpm_list_mtx);
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static DEFINE_MUTEX(dpm_mtx);
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static DEFINE_MUTEX(dpm_list_mtx);
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int (*platform_enable_wakeup)(struct device *dev, int is_on);
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int device_pm_add(struct device *dev)
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{
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int error;
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@ -61,3 +66,334 @@ void device_pm_remove(struct device *dev)
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}
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/*------------------------- Resume routines -------------------------*/
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/**
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* resume_device - Restore state for one device.
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* @dev: Device.
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*
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*/
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static int resume_device(struct device * dev)
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{
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int error = 0;
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TRACE_DEVICE(dev);
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TRACE_RESUME(0);
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down(&dev->sem);
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if (dev->bus && dev->bus->resume) {
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dev_dbg(dev,"resuming\n");
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error = dev->bus->resume(dev);
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}
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if (!error && dev->type && dev->type->resume) {
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dev_dbg(dev,"resuming\n");
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error = dev->type->resume(dev);
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}
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if (!error && dev->class && dev->class->resume) {
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dev_dbg(dev,"class resume\n");
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error = dev->class->resume(dev);
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}
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up(&dev->sem);
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TRACE_RESUME(error);
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return error;
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}
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static int resume_device_early(struct device * dev)
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{
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int error = 0;
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TRACE_DEVICE(dev);
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TRACE_RESUME(0);
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if (dev->bus && dev->bus->resume_early) {
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dev_dbg(dev,"EARLY resume\n");
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error = dev->bus->resume_early(dev);
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}
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TRACE_RESUME(error);
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return error;
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}
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/*
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* Resume the devices that have either not gone through
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* the late suspend, or that did go through it but also
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* went through the early resume
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*/
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static void dpm_resume(void)
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{
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mutex_lock(&dpm_list_mtx);
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while(!list_empty(&dpm_off)) {
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struct list_head * entry = dpm_off.next;
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struct device * dev = to_device(entry);
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get_device(dev);
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list_move_tail(entry, &dpm_active);
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mutex_unlock(&dpm_list_mtx);
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resume_device(dev);
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mutex_lock(&dpm_list_mtx);
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put_device(dev);
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}
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mutex_unlock(&dpm_list_mtx);
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}
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/**
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* device_resume - Restore state of each device in system.
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*
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* Walk the dpm_off list, remove each entry, resume the device,
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* then add it to the dpm_active list.
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*/
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void device_resume(void)
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{
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might_sleep();
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mutex_lock(&dpm_mtx);
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dpm_resume();
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mutex_unlock(&dpm_mtx);
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}
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EXPORT_SYMBOL_GPL(device_resume);
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/**
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* dpm_power_up - Power on some devices.
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*
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* Walk the dpm_off_irq list and power each device up. This
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* is used for devices that required they be powered down with
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* interrupts disabled. As devices are powered on, they are moved
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* to the dpm_active list.
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*
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* Interrupts must be disabled when calling this.
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*/
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static void dpm_power_up(void)
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{
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while(!list_empty(&dpm_off_irq)) {
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struct list_head * entry = dpm_off_irq.next;
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struct device * dev = to_device(entry);
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list_move_tail(entry, &dpm_off);
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resume_device_early(dev);
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}
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}
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/**
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* device_power_up - Turn on all devices that need special attention.
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*
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* Power on system devices then devices that required we shut them down
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* with interrupts disabled.
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* Called with interrupts disabled.
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*/
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void device_power_up(void)
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{
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sysdev_resume();
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dpm_power_up();
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}
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EXPORT_SYMBOL_GPL(device_power_up);
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/*------------------------- Suspend routines -------------------------*/
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/*
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* The entries in the dpm_active list are in a depth first order, simply
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* because children are guaranteed to be discovered after parents, and
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* are inserted at the back of the list on discovery.
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*
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* All list on the suspend path are done in reverse order, so we operate
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* on the leaves of the device tree (or forests, depending on how you want
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* to look at it ;) first. As nodes are removed from the back of the list,
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* they are inserted into the front of their destintation lists.
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*
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* Things are the reverse on the resume path - iterations are done in
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* forward order, and nodes are inserted at the back of their destination
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* lists. This way, the ancestors will be accessed before their descendents.
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*/
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static inline char *suspend_verb(u32 event)
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{
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switch (event) {
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case PM_EVENT_SUSPEND: return "suspend";
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case PM_EVENT_FREEZE: return "freeze";
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case PM_EVENT_PRETHAW: return "prethaw";
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default: return "(unknown suspend event)";
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}
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}
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static void
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suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
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{
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dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
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((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
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", may wakeup" : "");
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}
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/**
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* suspend_device - Save state of one device.
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* @dev: Device.
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* @state: Power state device is entering.
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*/
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static int suspend_device(struct device * dev, pm_message_t state)
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{
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int error = 0;
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down(&dev->sem);
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if (dev->power.power_state.event) {
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dev_dbg(dev, "PM: suspend %d-->%d\n",
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dev->power.power_state.event, state.event);
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}
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if (dev->class && dev->class->suspend) {
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suspend_device_dbg(dev, state, "class ");
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error = dev->class->suspend(dev, state);
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suspend_report_result(dev->class->suspend, error);
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}
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if (!error && dev->type && dev->type->suspend) {
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suspend_device_dbg(dev, state, "type ");
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error = dev->type->suspend(dev, state);
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suspend_report_result(dev->type->suspend, error);
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}
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if (!error && dev->bus && dev->bus->suspend) {
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suspend_device_dbg(dev, state, "");
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error = dev->bus->suspend(dev, state);
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suspend_report_result(dev->bus->suspend, error);
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}
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up(&dev->sem);
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return error;
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}
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/*
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* This is called with interrupts off, only a single CPU
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* running. We can't acquire a mutex or semaphore (and we don't
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* need the protection)
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*/
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static int suspend_device_late(struct device *dev, pm_message_t state)
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{
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int error = 0;
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if (dev->bus && dev->bus->suspend_late) {
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suspend_device_dbg(dev, state, "LATE ");
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error = dev->bus->suspend_late(dev, state);
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suspend_report_result(dev->bus->suspend_late, error);
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}
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return error;
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}
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/**
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* device_suspend - Save state and stop all devices in system.
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* @state: Power state to put each device in.
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*
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* Walk the dpm_active list, call ->suspend() for each device, and move
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* it to the dpm_off list.
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*
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* (For historical reasons, if it returns -EAGAIN, that used to mean
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* that the device would be called again with interrupts disabled.
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* These days, we use the "suspend_late()" callback for that, so we
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* print a warning and consider it an error).
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*
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* If we get a different error, try and back out.
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*
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* If we hit a failure with any of the devices, call device_resume()
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* above to bring the suspended devices back to life.
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*
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*/
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int device_suspend(pm_message_t state)
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{
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int error = 0;
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might_sleep();
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mutex_lock(&dpm_mtx);
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mutex_lock(&dpm_list_mtx);
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while (!list_empty(&dpm_active) && error == 0) {
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struct list_head * entry = dpm_active.prev;
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struct device * dev = to_device(entry);
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get_device(dev);
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mutex_unlock(&dpm_list_mtx);
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error = suspend_device(dev, state);
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mutex_lock(&dpm_list_mtx);
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/* Check if the device got removed */
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if (!list_empty(&dev->power.entry)) {
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/* Move it to the dpm_off list */
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if (!error)
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list_move(&dev->power.entry, &dpm_off);
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}
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if (error)
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printk(KERN_ERR "Could not suspend device %s: "
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"error %d%s\n",
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kobject_name(&dev->kobj), error,
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error == -EAGAIN ? " (please convert to suspend_late)" : "");
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put_device(dev);
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}
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mutex_unlock(&dpm_list_mtx);
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if (error)
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dpm_resume();
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mutex_unlock(&dpm_mtx);
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return error;
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}
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EXPORT_SYMBOL_GPL(device_suspend);
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/**
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* device_power_down - Shut down special devices.
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* @state: Power state to enter.
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*
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* Walk the dpm_off_irq list, calling ->power_down() for each device that
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* couldn't power down the device with interrupts enabled. When we're
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* done, power down system devices.
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*/
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int device_power_down(pm_message_t state)
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{
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int error = 0;
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struct device * dev;
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while (!list_empty(&dpm_off)) {
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struct list_head * entry = dpm_off.prev;
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dev = to_device(entry);
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error = suspend_device_late(dev, state);
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if (error)
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goto Error;
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list_move(&dev->power.entry, &dpm_off_irq);
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}
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error = sysdev_suspend(state);
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Done:
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return error;
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Error:
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printk(KERN_ERR "Could not power down device %s: "
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"error %d\n", kobject_name(&dev->kobj), error);
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dpm_power_up();
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goto Done;
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}
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EXPORT_SYMBOL_GPL(device_power_down);
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void __suspend_report_result(const char *function, void *fn, int ret)
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{
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if (ret) {
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printk(KERN_ERR "%s(): ", function);
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print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
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printk("%d\n", ret);
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}
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}
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EXPORT_SYMBOL_GPL(__suspend_report_result);
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@ -11,32 +11,11 @@ extern void device_shutdown(void);
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* main.c
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*/
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/*
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* Used to synchronize global power management operations.
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*/
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extern struct mutex dpm_mtx;
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/*
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* Used to serialize changes to the dpm_* lists.
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*/
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extern struct mutex dpm_list_mtx;
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/*
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* The PM lists.
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*/
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extern struct list_head dpm_active;
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extern struct list_head dpm_off;
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extern struct list_head dpm_off_irq;
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static inline struct dev_pm_info * to_pm_info(struct list_head * entry)
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{
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return container_of(entry, struct dev_pm_info, entry);
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}
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extern struct list_head dpm_active; /* The active device list */
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static inline struct device * to_device(struct list_head * entry)
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{
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return container_of(to_pm_info(entry), struct device, power);
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return container_of(entry, struct device, power.entry);
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}
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extern int device_pm_add(struct device *);
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@ -49,13 +28,6 @@ extern void device_pm_remove(struct device *);
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extern int dpm_sysfs_add(struct device *);
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extern void dpm_sysfs_remove(struct device *);
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/*
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* resume.c
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*/
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extern void dpm_resume(void);
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extern void dpm_power_up(void);
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#else /* CONFIG_PM_SLEEP */
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@ -1,149 +0,0 @@
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/*
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* resume.c - Functions for waking devices up.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Labs
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include <linux/resume-trace.h>
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#include "../base.h"
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#include "power.h"
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/**
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* resume_device - Restore state for one device.
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* @dev: Device.
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*
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*/
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static int resume_device(struct device * dev)
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{
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int error = 0;
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TRACE_DEVICE(dev);
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TRACE_RESUME(0);
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down(&dev->sem);
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if (dev->bus && dev->bus->resume) {
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dev_dbg(dev,"resuming\n");
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error = dev->bus->resume(dev);
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}
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if (!error && dev->type && dev->type->resume) {
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dev_dbg(dev,"resuming\n");
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error = dev->type->resume(dev);
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}
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if (!error && dev->class && dev->class->resume) {
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dev_dbg(dev,"class resume\n");
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error = dev->class->resume(dev);
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}
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up(&dev->sem);
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TRACE_RESUME(error);
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return error;
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}
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static int resume_device_early(struct device * dev)
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{
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int error = 0;
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TRACE_DEVICE(dev);
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TRACE_RESUME(0);
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if (dev->bus && dev->bus->resume_early) {
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dev_dbg(dev,"EARLY resume\n");
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error = dev->bus->resume_early(dev);
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}
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TRACE_RESUME(error);
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return error;
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}
|
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|
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/*
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* Resume the devices that have either not gone through
|
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* the late suspend, or that did go through it but also
|
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* went through the early resume
|
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*/
|
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void dpm_resume(void)
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{
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mutex_lock(&dpm_list_mtx);
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while(!list_empty(&dpm_off)) {
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struct list_head * entry = dpm_off.next;
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struct device * dev = to_device(entry);
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get_device(dev);
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list_move_tail(entry, &dpm_active);
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mutex_unlock(&dpm_list_mtx);
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resume_device(dev);
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mutex_lock(&dpm_list_mtx);
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put_device(dev);
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}
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mutex_unlock(&dpm_list_mtx);
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}
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/**
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* device_resume - Restore state of each device in system.
|
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*
|
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* Walk the dpm_off list, remove each entry, resume the device,
|
||||
* then add it to the dpm_active list.
|
||||
*/
|
||||
|
||||
void device_resume(void)
|
||||
{
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
dpm_resume();
|
||||
mutex_unlock(&dpm_mtx);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_resume);
|
||||
|
||||
|
||||
/**
|
||||
* dpm_power_up - Power on some devices.
|
||||
*
|
||||
* Walk the dpm_off_irq list and power each device up. This
|
||||
* is used for devices that required they be powered down with
|
||||
* interrupts disabled. As devices are powered on, they are moved
|
||||
* to the dpm_active list.
|
||||
*
|
||||
* Interrupts must be disabled when calling this.
|
||||
*/
|
||||
|
||||
void dpm_power_up(void)
|
||||
{
|
||||
while(!list_empty(&dpm_off_irq)) {
|
||||
struct list_head * entry = dpm_off_irq.next;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
list_move_tail(entry, &dpm_off);
|
||||
resume_device_early(dev);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* device_power_up - Turn on all devices that need special attention.
|
||||
*
|
||||
* Power on system devices then devices that required we shut them down
|
||||
* with interrupts disabled.
|
||||
* Called with interrupts disabled.
|
||||
*/
|
||||
|
||||
void device_power_up(void)
|
||||
{
|
||||
sysdev_resume();
|
||||
dpm_power_up();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_up);
|
||||
|
||||
|
||||
@ -1,210 +0,0 @@
|
||||
/*
|
||||
* suspend.c - Functions for putting devices to sleep.
|
||||
*
|
||||
* Copyright (c) 2003 Patrick Mochel
|
||||
* Copyright (c) 2003 Open Source Development Labs
|
||||
*
|
||||
* This file is released under the GPLv2
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/pm.h>
|
||||
#include "../base.h"
|
||||
#include "power.h"
|
||||
|
||||
/*
|
||||
* The entries in the dpm_active list are in a depth first order, simply
|
||||
* because children are guaranteed to be discovered after parents, and
|
||||
* are inserted at the back of the list on discovery.
|
||||
*
|
||||
* All list on the suspend path are done in reverse order, so we operate
|
||||
* on the leaves of the device tree (or forests, depending on how you want
|
||||
* to look at it ;) first. As nodes are removed from the back of the list,
|
||||
* they are inserted into the front of their destintation lists.
|
||||
*
|
||||
* Things are the reverse on the resume path - iterations are done in
|
||||
* forward order, and nodes are inserted at the back of their destination
|
||||
* lists. This way, the ancestors will be accessed before their descendents.
|
||||
*/
|
||||
|
||||
static inline char *suspend_verb(u32 event)
|
||||
{
|
||||
switch (event) {
|
||||
case PM_EVENT_SUSPEND: return "suspend";
|
||||
case PM_EVENT_FREEZE: return "freeze";
|
||||
case PM_EVENT_PRETHAW: return "prethaw";
|
||||
default: return "(unknown suspend event)";
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
|
||||
{
|
||||
dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
|
||||
((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
|
||||
", may wakeup" : "");
|
||||
}
|
||||
|
||||
/**
|
||||
* suspend_device - Save state of one device.
|
||||
* @dev: Device.
|
||||
* @state: Power state device is entering.
|
||||
*/
|
||||
|
||||
static int suspend_device(struct device * dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
down(&dev->sem);
|
||||
if (dev->power.power_state.event) {
|
||||
dev_dbg(dev, "PM: suspend %d-->%d\n",
|
||||
dev->power.power_state.event, state.event);
|
||||
}
|
||||
|
||||
if (dev->class && dev->class->suspend) {
|
||||
suspend_device_dbg(dev, state, "class ");
|
||||
error = dev->class->suspend(dev, state);
|
||||
suspend_report_result(dev->class->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->type && dev->type->suspend) {
|
||||
suspend_device_dbg(dev, state, "type ");
|
||||
error = dev->type->suspend(dev, state);
|
||||
suspend_report_result(dev->type->suspend, error);
|
||||
}
|
||||
|
||||
if (!error && dev->bus && dev->bus->suspend) {
|
||||
suspend_device_dbg(dev, state, "");
|
||||
error = dev->bus->suspend(dev, state);
|
||||
suspend_report_result(dev->bus->suspend, error);
|
||||
}
|
||||
up(&dev->sem);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* This is called with interrupts off, only a single CPU
|
||||
* running. We can't acquire a mutex or semaphore (and we don't
|
||||
* need the protection)
|
||||
*/
|
||||
static int suspend_device_late(struct device *dev, pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
if (dev->bus && dev->bus->suspend_late) {
|
||||
suspend_device_dbg(dev, state, "LATE ");
|
||||
error = dev->bus->suspend_late(dev, state);
|
||||
suspend_report_result(dev->bus->suspend_late, error);
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
||||
/**
|
||||
* device_suspend - Save state and stop all devices in system.
|
||||
* @state: Power state to put each device in.
|
||||
*
|
||||
* Walk the dpm_active list, call ->suspend() for each device, and move
|
||||
* it to the dpm_off list.
|
||||
*
|
||||
* (For historical reasons, if it returns -EAGAIN, that used to mean
|
||||
* that the device would be called again with interrupts disabled.
|
||||
* These days, we use the "suspend_late()" callback for that, so we
|
||||
* print a warning and consider it an error).
|
||||
*
|
||||
* If we get a different error, try and back out.
|
||||
*
|
||||
* If we hit a failure with any of the devices, call device_resume()
|
||||
* above to bring the suspended devices back to life.
|
||||
*
|
||||
*/
|
||||
|
||||
int device_suspend(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
|
||||
might_sleep();
|
||||
mutex_lock(&dpm_mtx);
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
while (!list_empty(&dpm_active) && error == 0) {
|
||||
struct list_head * entry = dpm_active.prev;
|
||||
struct device * dev = to_device(entry);
|
||||
|
||||
get_device(dev);
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
|
||||
error = suspend_device(dev, state);
|
||||
|
||||
mutex_lock(&dpm_list_mtx);
|
||||
|
||||
/* Check if the device got removed */
|
||||
if (!list_empty(&dev->power.entry)) {
|
||||
/* Move it to the dpm_off list */
|
||||
if (!error)
|
||||
list_move(&dev->power.entry, &dpm_off);
|
||||
}
|
||||
if (error)
|
||||
printk(KERN_ERR "Could not suspend device %s: "
|
||||
"error %d%s\n",
|
||||
kobject_name(&dev->kobj), error,
|
||||
error == -EAGAIN ? " (please convert to suspend_late)" : "");
|
||||
put_device(dev);
|
||||
}
|
||||
mutex_unlock(&dpm_list_mtx);
|
||||
if (error)
|
||||
dpm_resume();
|
||||
|
||||
mutex_unlock(&dpm_mtx);
|
||||
return error;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_suspend);
|
||||
|
||||
/**
|
||||
* device_power_down - Shut down special devices.
|
||||
* @state: Power state to enter.
|
||||
*
|
||||
* Walk the dpm_off_irq list, calling ->power_down() for each device that
|
||||
* couldn't power down the device with interrupts enabled. When we're
|
||||
* done, power down system devices.
|
||||
*/
|
||||
|
||||
int device_power_down(pm_message_t state)
|
||||
{
|
||||
int error = 0;
|
||||
struct device * dev;
|
||||
|
||||
while (!list_empty(&dpm_off)) {
|
||||
struct list_head * entry = dpm_off.prev;
|
||||
|
||||
dev = to_device(entry);
|
||||
error = suspend_device_late(dev, state);
|
||||
if (error)
|
||||
goto Error;
|
||||
list_move(&dev->power.entry, &dpm_off_irq);
|
||||
}
|
||||
|
||||
error = sysdev_suspend(state);
|
||||
Done:
|
||||
return error;
|
||||
Error:
|
||||
printk(KERN_ERR "Could not power down device %s: "
|
||||
"error %d\n", kobject_name(&dev->kobj), error);
|
||||
dpm_power_up();
|
||||
goto Done;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL_GPL(device_power_down);
|
||||
|
||||
void __suspend_report_result(const char *function, void *fn, int ret)
|
||||
{
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s(): ", function);
|
||||
print_fn_descriptor_symbol("%s() returns ", (unsigned long)fn);
|
||||
printk("%d\n", ret);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__suspend_report_result);
|
||||
Loading…
Reference in New Issue
Block a user