mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-25 02:48:21 +00:00
5248051b9a
There is some code in drivers/base/power/domain.c that will be useful for both runtime PM and system-wide power transitions, so make it depend on CONFIG_PM instead of CONFIG_PM_RUNTIME. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Reviewed-by: Kevin Hilman <khilman@ti.com>
505 lines
11 KiB
C
505 lines
11 KiB
C
/*
|
|
* drivers/base/power/domain.c - Common code related to device power domains.
|
|
*
|
|
* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/io.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/pm_domain.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static struct generic_pm_domain *dev_to_genpd(struct device *dev)
|
|
{
|
|
if (IS_ERR_OR_NULL(dev->pm_domain))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return container_of(dev->pm_domain, struct generic_pm_domain, domain);
|
|
}
|
|
|
|
static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
|
|
{
|
|
if (!WARN_ON(genpd->sd_count == 0))
|
|
genpd->sd_count--;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_poweron - Restore power to a given PM domain and its parents.
|
|
* @genpd: PM domain to power up.
|
|
*
|
|
* Restore power to @genpd and all of its parents so that it is possible to
|
|
* resume a device belonging to it.
|
|
*/
|
|
static int pm_genpd_poweron(struct generic_pm_domain *genpd)
|
|
{
|
|
int ret = 0;
|
|
|
|
start:
|
|
if (genpd->parent)
|
|
mutex_lock(&genpd->parent->lock);
|
|
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (!genpd->power_is_off)
|
|
goto out;
|
|
|
|
if (genpd->parent && genpd->parent->power_is_off) {
|
|
mutex_unlock(&genpd->lock);
|
|
mutex_unlock(&genpd->parent->lock);
|
|
|
|
ret = pm_genpd_poweron(genpd->parent);
|
|
if (ret)
|
|
return ret;
|
|
|
|
goto start;
|
|
}
|
|
|
|
if (genpd->power_on) {
|
|
int ret = genpd->power_on(genpd);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
genpd->power_is_off = false;
|
|
if (genpd->parent)
|
|
genpd->parent->sd_count++;
|
|
|
|
out:
|
|
mutex_unlock(&genpd->lock);
|
|
if (genpd->parent)
|
|
mutex_unlock(&genpd->parent->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
|
|
/**
|
|
* __pm_genpd_save_device - Save the pre-suspend state of a device.
|
|
* @dle: Device list entry of the device to save the state of.
|
|
* @genpd: PM domain the device belongs to.
|
|
*/
|
|
static int __pm_genpd_save_device(struct dev_list_entry *dle,
|
|
struct generic_pm_domain *genpd)
|
|
{
|
|
struct device *dev = dle->dev;
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (dle->need_restore)
|
|
return 0;
|
|
|
|
if (drv && drv->pm && drv->pm->runtime_suspend) {
|
|
if (genpd->start_device)
|
|
genpd->start_device(dev);
|
|
|
|
ret = drv->pm->runtime_suspend(dev);
|
|
|
|
if (genpd->stop_device)
|
|
genpd->stop_device(dev);
|
|
}
|
|
|
|
if (!ret)
|
|
dle->need_restore = true;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* __pm_genpd_restore_device - Restore the pre-suspend state of a device.
|
|
* @dle: Device list entry of the device to restore the state of.
|
|
* @genpd: PM domain the device belongs to.
|
|
*/
|
|
static void __pm_genpd_restore_device(struct dev_list_entry *dle,
|
|
struct generic_pm_domain *genpd)
|
|
{
|
|
struct device *dev = dle->dev;
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
if (!dle->need_restore)
|
|
return;
|
|
|
|
if (drv && drv->pm && drv->pm->runtime_resume) {
|
|
if (genpd->start_device)
|
|
genpd->start_device(dev);
|
|
|
|
drv->pm->runtime_resume(dev);
|
|
|
|
if (genpd->stop_device)
|
|
genpd->stop_device(dev);
|
|
}
|
|
|
|
dle->need_restore = false;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_poweroff - Remove power from a given PM domain.
|
|
* @genpd: PM domain to power down.
|
|
*
|
|
* If all of the @genpd's devices have been suspended and all of its subdomains
|
|
* have been powered down, run the runtime suspend callbacks provided by all of
|
|
* the @genpd's devices' drivers and remove power from @genpd.
|
|
*/
|
|
static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
|
|
{
|
|
struct generic_pm_domain *parent;
|
|
struct dev_list_entry *dle;
|
|
unsigned int not_suspended;
|
|
int ret;
|
|
|
|
if (genpd->power_is_off)
|
|
return 0;
|
|
|
|
if (genpd->sd_count > 0)
|
|
return -EBUSY;
|
|
|
|
not_suspended = 0;
|
|
list_for_each_entry(dle, &genpd->dev_list, node)
|
|
if (dle->dev->driver && !pm_runtime_suspended(dle->dev))
|
|
not_suspended++;
|
|
|
|
if (not_suspended > genpd->in_progress)
|
|
return -EBUSY;
|
|
|
|
if (genpd->gov && genpd->gov->power_down_ok) {
|
|
if (!genpd->gov->power_down_ok(&genpd->domain))
|
|
return -EAGAIN;
|
|
}
|
|
|
|
list_for_each_entry_reverse(dle, &genpd->dev_list, node) {
|
|
ret = __pm_genpd_save_device(dle, genpd);
|
|
if (ret)
|
|
goto err_dev;
|
|
}
|
|
|
|
if (genpd->power_off)
|
|
genpd->power_off(genpd);
|
|
|
|
genpd->power_is_off = true;
|
|
|
|
parent = genpd->parent;
|
|
if (parent) {
|
|
genpd_sd_counter_dec(parent);
|
|
if (parent->sd_count == 0)
|
|
queue_work(pm_wq, &parent->power_off_work);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_dev:
|
|
list_for_each_entry_continue(dle, &genpd->dev_list, node)
|
|
__pm_genpd_restore_device(dle, genpd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
|
|
* @work: Work structure used for scheduling the execution of this function.
|
|
*/
|
|
static void genpd_power_off_work_fn(struct work_struct *work)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
genpd = container_of(work, struct generic_pm_domain, power_off_work);
|
|
|
|
if (genpd->parent)
|
|
mutex_lock(&genpd->parent->lock);
|
|
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
|
|
pm_genpd_poweroff(genpd);
|
|
mutex_unlock(&genpd->lock);
|
|
if (genpd->parent)
|
|
mutex_unlock(&genpd->parent->lock);
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out a runtime suspend of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_runtime_suspend(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
if (genpd->parent)
|
|
mutex_lock(&genpd->parent->lock);
|
|
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (genpd->stop_device) {
|
|
int ret = genpd->stop_device(dev);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
genpd->in_progress++;
|
|
pm_genpd_poweroff(genpd);
|
|
genpd->in_progress--;
|
|
|
|
out:
|
|
mutex_unlock(&genpd->lock);
|
|
if (genpd->parent)
|
|
mutex_unlock(&genpd->parent->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
|
|
* @dev: Device to resume.
|
|
*
|
|
* Carry out a runtime resume of a device under the assumption that its
|
|
* pm_domain field points to the domain member of an object of type
|
|
* struct generic_pm_domain representing a PM domain consisting of I/O devices.
|
|
*/
|
|
static int pm_genpd_runtime_resume(struct device *dev)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
struct dev_list_entry *dle;
|
|
int ret;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
genpd = dev_to_genpd(dev);
|
|
if (IS_ERR(genpd))
|
|
return -EINVAL;
|
|
|
|
ret = pm_genpd_poweron(genpd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
list_for_each_entry(dle, &genpd->dev_list, node) {
|
|
if (dle->dev == dev) {
|
|
__pm_genpd_restore_device(dle, genpd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (genpd->start_device)
|
|
genpd->start_device(dev);
|
|
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void genpd_power_off_work_fn(struct work_struct *work) {}
|
|
|
|
#define pm_genpd_runtime_suspend NULL
|
|
#define pm_genpd_runtime_resume NULL
|
|
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
/**
|
|
* pm_genpd_add_device - Add a device to an I/O PM domain.
|
|
* @genpd: PM domain to add the device to.
|
|
* @dev: Device to be added.
|
|
*/
|
|
int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
|
|
{
|
|
struct dev_list_entry *dle;
|
|
int ret = 0;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
if (genpd->power_is_off) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(dle, &genpd->dev_list, node)
|
|
if (dle->dev == dev) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
dle = kzalloc(sizeof(*dle), GFP_KERNEL);
|
|
if (!dle) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
dle->dev = dev;
|
|
dle->need_restore = false;
|
|
list_add_tail(&dle->node, &genpd->dev_list);
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->pm_domain = &genpd->domain;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
out:
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_remove_device - Remove a device from an I/O PM domain.
|
|
* @genpd: PM domain to remove the device from.
|
|
* @dev: Device to be removed.
|
|
*/
|
|
int pm_genpd_remove_device(struct generic_pm_domain *genpd,
|
|
struct device *dev)
|
|
{
|
|
struct dev_list_entry *dle;
|
|
int ret = -EINVAL;
|
|
|
|
dev_dbg(dev, "%s()\n", __func__);
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
list_for_each_entry(dle, &genpd->dev_list, node) {
|
|
if (dle->dev != dev)
|
|
continue;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->pm_domain = NULL;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
list_del(&dle->node);
|
|
kfree(dle);
|
|
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
|
|
* @genpd: Master PM domain to add the subdomain to.
|
|
* @new_subdomain: Subdomain to be added.
|
|
*/
|
|
int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
|
|
struct generic_pm_domain *new_subdomain)
|
|
{
|
|
struct generic_pm_domain *subdomain;
|
|
int ret = 0;
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
if (genpd->power_is_off && !new_subdomain->power_is_off) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
|
|
if (subdomain == new_subdomain) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
list_add_tail(&new_subdomain->sd_node, &genpd->sd_list);
|
|
new_subdomain->parent = genpd;
|
|
if (!subdomain->power_is_off)
|
|
genpd->sd_count++;
|
|
|
|
mutex_unlock(&new_subdomain->lock);
|
|
|
|
out:
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
|
|
* @genpd: Master PM domain to remove the subdomain from.
|
|
* @target: Subdomain to be removed.
|
|
*/
|
|
int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
|
|
struct generic_pm_domain *target)
|
|
{
|
|
struct generic_pm_domain *subdomain;
|
|
int ret = -EINVAL;
|
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&genpd->lock);
|
|
|
|
list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
|
|
if (subdomain != target)
|
|
continue;
|
|
|
|
mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
|
|
|
|
list_del(&subdomain->sd_node);
|
|
subdomain->parent = NULL;
|
|
if (!subdomain->power_is_off)
|
|
genpd_sd_counter_dec(genpd);
|
|
|
|
mutex_unlock(&subdomain->lock);
|
|
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&genpd->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pm_genpd_init - Initialize a generic I/O PM domain object.
|
|
* @genpd: PM domain object to initialize.
|
|
* @gov: PM domain governor to associate with the domain (may be NULL).
|
|
* @is_off: Initial value of the domain's power_is_off field.
|
|
*/
|
|
void pm_genpd_init(struct generic_pm_domain *genpd,
|
|
struct dev_power_governor *gov, bool is_off)
|
|
{
|
|
if (IS_ERR_OR_NULL(genpd))
|
|
return;
|
|
|
|
INIT_LIST_HEAD(&genpd->sd_node);
|
|
genpd->parent = NULL;
|
|
INIT_LIST_HEAD(&genpd->dev_list);
|
|
INIT_LIST_HEAD(&genpd->sd_list);
|
|
mutex_init(&genpd->lock);
|
|
genpd->gov = gov;
|
|
INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
|
|
genpd->in_progress = 0;
|
|
genpd->sd_count = 0;
|
|
genpd->power_is_off = is_off;
|
|
genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
|
|
genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
|
|
genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
|
|
}
|