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3300 lines
83 KiB
3300 lines
83 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* drivers/base/power/domain.c - Common code related to device power domains. |
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* |
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* Copyright (C) 2011 Rafael J. Wysocki <[email protected]>, Renesas Electronics Corp. |
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*/ |
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#define pr_fmt(fmt) "PM: " fmt |
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|
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#include <linux/delay.h> |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_opp.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/pm_domain.h> |
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#include <linux/pm_qos.h> |
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#include <linux/pm_clock.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/sched.h> |
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#include <linux/suspend.h> |
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#include <linux/export.h> |
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#include <linux/cpu.h> |
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#include <linux/debugfs.h> |
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|
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#include "power.h" |
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|
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#define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
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|
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#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
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({ \ |
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type (*__routine)(struct device *__d); \ |
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type __ret = (type)0; \ |
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\ |
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__routine = genpd->dev_ops.callback; \ |
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if (__routine) { \ |
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__ret = __routine(dev); \ |
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} \ |
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__ret; \ |
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}) |
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|
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static LIST_HEAD(gpd_list); |
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static DEFINE_MUTEX(gpd_list_lock); |
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|
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struct genpd_lock_ops { |
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void (*lock)(struct generic_pm_domain *genpd); |
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void (*lock_nested)(struct generic_pm_domain *genpd, int depth); |
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int (*lock_interruptible)(struct generic_pm_domain *genpd); |
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void (*unlock)(struct generic_pm_domain *genpd); |
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}; |
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|
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static void genpd_lock_mtx(struct generic_pm_domain *genpd) |
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{ |
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mutex_lock(&genpd->mlock); |
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} |
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|
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static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, |
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int depth) |
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{ |
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mutex_lock_nested(&genpd->mlock, depth); |
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} |
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|
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static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) |
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{ |
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return mutex_lock_interruptible(&genpd->mlock); |
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} |
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|
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static void genpd_unlock_mtx(struct generic_pm_domain *genpd) |
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{ |
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return mutex_unlock(&genpd->mlock); |
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} |
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|
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static const struct genpd_lock_ops genpd_mtx_ops = { |
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.lock = genpd_lock_mtx, |
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.lock_nested = genpd_lock_nested_mtx, |
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.lock_interruptible = genpd_lock_interruptible_mtx, |
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.unlock = genpd_unlock_mtx, |
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}; |
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|
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static void genpd_lock_spin(struct generic_pm_domain *genpd) |
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__acquires(&genpd->slock) |
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{ |
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unsigned long flags; |
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|
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spin_lock_irqsave(&genpd->slock, flags); |
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genpd->lock_flags = flags; |
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} |
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|
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static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, |
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int depth) |
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__acquires(&genpd->slock) |
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{ |
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unsigned long flags; |
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|
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spin_lock_irqsave_nested(&genpd->slock, flags, depth); |
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genpd->lock_flags = flags; |
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} |
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|
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static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) |
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__acquires(&genpd->slock) |
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{ |
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unsigned long flags; |
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|
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spin_lock_irqsave(&genpd->slock, flags); |
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genpd->lock_flags = flags; |
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return 0; |
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} |
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|
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static void genpd_unlock_spin(struct generic_pm_domain *genpd) |
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__releases(&genpd->slock) |
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{ |
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spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); |
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} |
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|
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static const struct genpd_lock_ops genpd_spin_ops = { |
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.lock = genpd_lock_spin, |
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.lock_nested = genpd_lock_nested_spin, |
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.lock_interruptible = genpd_lock_interruptible_spin, |
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.unlock = genpd_unlock_spin, |
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}; |
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|
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#define genpd_lock(p) p->lock_ops->lock(p) |
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#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) |
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#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) |
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#define genpd_unlock(p) p->lock_ops->unlock(p) |
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|
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#define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) |
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#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
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#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
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#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
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#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
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#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
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|
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static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, |
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const struct generic_pm_domain *genpd) |
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{ |
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bool ret; |
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|
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ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); |
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|
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/* |
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* Warn once if an IRQ safe device is attached to a no sleep domain, as |
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* to indicate a suboptimal configuration for PM. For an always on |
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* domain this isn't case, thus don't warn. |
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*/ |
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if (ret && !genpd_is_always_on(genpd)) |
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dev_warn_once(dev, "PM domain %s will not be powered off\n", |
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genpd->name); |
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|
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return ret; |
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} |
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|
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static int genpd_runtime_suspend(struct device *dev); |
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|
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/* |
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* Get the generic PM domain for a particular struct device. |
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* This validates the struct device pointer, the PM domain pointer, |
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* and checks that the PM domain pointer is a real generic PM domain. |
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* Any failure results in NULL being returned. |
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*/ |
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static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
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{ |
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if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
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return NULL; |
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|
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/* A genpd's always have its ->runtime_suspend() callback assigned. */ |
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if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) |
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return pd_to_genpd(dev->pm_domain); |
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|
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return NULL; |
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} |
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|
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/* |
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* This should only be used where we are certain that the pm_domain |
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* attached to the device is a genpd domain. |
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*/ |
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static struct generic_pm_domain *dev_to_genpd(struct device *dev) |
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{ |
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if (IS_ERR_OR_NULL(dev->pm_domain)) |
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return ERR_PTR(-EINVAL); |
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|
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return pd_to_genpd(dev->pm_domain); |
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} |
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|
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static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
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struct device *dev) |
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{ |
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return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
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} |
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|
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static int genpd_start_dev(const struct generic_pm_domain *genpd, |
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struct device *dev) |
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{ |
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return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
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} |
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|
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static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
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{ |
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bool ret = false; |
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|
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if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) |
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ret = !!atomic_dec_and_test(&genpd->sd_count); |
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|
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return ret; |
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} |
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|
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static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) |
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{ |
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atomic_inc(&genpd->sd_count); |
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smp_mb__after_atomic(); |
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} |
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#ifdef CONFIG_DEBUG_FS |
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static struct dentry *genpd_debugfs_dir; |
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static void genpd_debug_add(struct generic_pm_domain *genpd); |
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|
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static void genpd_debug_remove(struct generic_pm_domain *genpd) |
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{ |
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struct dentry *d; |
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|
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d = debugfs_lookup(genpd->name, genpd_debugfs_dir); |
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debugfs_remove(d); |
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} |
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static void genpd_update_accounting(struct generic_pm_domain *genpd) |
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{ |
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ktime_t delta, now; |
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|
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now = ktime_get(); |
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delta = ktime_sub(now, genpd->accounting_time); |
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|
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/* |
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* If genpd->status is active, it means we are just |
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* out of off and so update the idle time and vice |
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* versa. |
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*/ |
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if (genpd->status == GENPD_STATE_ON) { |
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int state_idx = genpd->state_idx; |
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|
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genpd->states[state_idx].idle_time = |
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ktime_add(genpd->states[state_idx].idle_time, delta); |
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} else { |
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genpd->on_time = ktime_add(genpd->on_time, delta); |
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} |
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|
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genpd->accounting_time = now; |
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} |
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#else |
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static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} |
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static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} |
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static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
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#endif |
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static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
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unsigned int state) |
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{ |
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struct generic_pm_domain_data *pd_data; |
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struct pm_domain_data *pdd; |
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struct gpd_link *link; |
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|
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/* New requested state is same as Max requested state */ |
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if (state == genpd->performance_state) |
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return state; |
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|
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/* New requested state is higher than Max requested state */ |
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if (state > genpd->performance_state) |
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return state; |
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|
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/* Traverse all devices within the domain */ |
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list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
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pd_data = to_gpd_data(pdd); |
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|
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if (pd_data->performance_state > state) |
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state = pd_data->performance_state; |
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} |
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|
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/* |
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* Traverse all sub-domains within the domain. This can be |
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* done without any additional locking as the link->performance_state |
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* field is protected by the parent genpd->lock, which is already taken. |
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* |
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* Also note that link->performance_state (subdomain's performance state |
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* requirement to parent domain) is different from |
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* link->child->performance_state (current performance state requirement |
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* of the devices/sub-domains of the subdomain) and so can have a |
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* different value. |
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* |
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* Note that we also take vote from powered-off sub-domains into account |
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* as the same is done for devices right now. |
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*/ |
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list_for_each_entry(link, &genpd->parent_links, parent_node) { |
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if (link->performance_state > state) |
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state = link->performance_state; |
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} |
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return state; |
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} |
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static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, |
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struct generic_pm_domain *parent, |
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unsigned int pstate) |
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{ |
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if (!parent->set_performance_state) |
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return pstate; |
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return dev_pm_opp_xlate_performance_state(genpd->opp_table, |
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parent->opp_table, |
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pstate); |
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} |
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static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
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unsigned int state, int depth) |
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{ |
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struct generic_pm_domain *parent; |
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struct gpd_link *link; |
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int parent_state, ret; |
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|
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if (state == genpd->performance_state) |
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return 0; |
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|
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/* Propagate to parents of genpd */ |
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list_for_each_entry(link, &genpd->child_links, child_node) { |
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parent = link->parent; |
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|
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/* Find parent's performance state */ |
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ret = genpd_xlate_performance_state(genpd, parent, state); |
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if (unlikely(ret < 0)) |
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goto err; |
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parent_state = ret; |
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genpd_lock_nested(parent, depth + 1); |
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link->prev_performance_state = link->performance_state; |
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link->performance_state = parent_state; |
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parent_state = _genpd_reeval_performance_state(parent, |
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parent_state); |
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ret = _genpd_set_performance_state(parent, parent_state, depth + 1); |
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if (ret) |
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link->performance_state = link->prev_performance_state; |
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|
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genpd_unlock(parent); |
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|
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if (ret) |
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goto err; |
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} |
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|
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if (genpd->set_performance_state) { |
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ret = genpd->set_performance_state(genpd, state); |
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if (ret) |
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goto err; |
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} |
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|
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genpd->performance_state = state; |
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return 0; |
|
|
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err: |
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/* Encountered an error, lets rollback */ |
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list_for_each_entry_continue_reverse(link, &genpd->child_links, |
|
child_node) { |
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parent = link->parent; |
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|
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genpd_lock_nested(parent, depth + 1); |
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|
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parent_state = link->prev_performance_state; |
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link->performance_state = parent_state; |
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|
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parent_state = _genpd_reeval_performance_state(parent, |
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parent_state); |
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if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { |
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pr_err("%s: Failed to roll back to %d performance state\n", |
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parent->name, parent_state); |
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} |
|
|
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genpd_unlock(parent); |
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} |
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|
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return ret; |
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} |
|
|
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/** |
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* dev_pm_genpd_set_performance_state- Set performance state of device's power |
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* domain. |
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* |
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* @dev: Device for which the performance-state needs to be set. |
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* @state: Target performance state of the device. This can be set as 0 when the |
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* device doesn't have any performance state constraints left (And so |
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* the device wouldn't participate anymore to find the target |
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* performance state of the genpd). |
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* |
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* It is assumed that the users guarantee that the genpd wouldn't be detached |
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* while this routine is getting called. |
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* |
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* Returns 0 on success and negative error values on failures. |
|
*/ |
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int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) |
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{ |
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struct generic_pm_domain *genpd; |
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struct generic_pm_domain_data *gpd_data; |
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unsigned int prev; |
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int ret; |
|
|
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genpd = dev_to_genpd_safe(dev); |
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if (!genpd) |
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return -ENODEV; |
|
|
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if (WARN_ON(!dev->power.subsys_data || |
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!dev->power.subsys_data->domain_data)) |
|
return -EINVAL; |
|
|
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genpd_lock(genpd); |
|
|
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gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
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prev = gpd_data->performance_state; |
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gpd_data->performance_state = state; |
|
|
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state = _genpd_reeval_performance_state(genpd, state); |
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ret = _genpd_set_performance_state(genpd, state, 0); |
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if (ret) |
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gpd_data->performance_state = prev; |
|
|
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genpd_unlock(genpd); |
|
|
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return ret; |
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} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); |
|
|
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/** |
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* dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. |
|
* |
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* @dev: Device to handle |
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* @next: impending interrupt/wakeup for the device |
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* |
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* |
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* Allow devices to inform of the next wakeup. It's assumed that the users |
|
* guarantee that the genpd wouldn't be detached while this routine is getting |
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* called. Additionally, it's also assumed that @dev isn't runtime suspended |
|
* (RPM_SUSPENDED)." |
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* Although devices are expected to update the next_wakeup after the end of |
|
* their usecase as well, it is possible the devices themselves may not know |
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* about that, so stale @next will be ignored when powering off the domain. |
|
*/ |
|
void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
struct generic_pm_domain *genpd; |
|
|
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genpd = dev_to_genpd_safe(dev); |
|
if (!genpd) |
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return; |
|
|
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gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
|
gpd_data->next_wakeup = next; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); |
|
|
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static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
|
{ |
|
unsigned int state_idx = genpd->state_idx; |
|
ktime_t time_start; |
|
s64 elapsed_ns; |
|
int ret; |
|
|
|
/* Notify consumers that we are about to power on. */ |
|
ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
|
GENPD_NOTIFY_PRE_ON, |
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GENPD_NOTIFY_OFF, NULL); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
return ret; |
|
|
|
if (!genpd->power_on) |
|
goto out; |
|
|
|
if (!timed) { |
|
ret = genpd->power_on(genpd); |
|
if (ret) |
|
goto err; |
|
|
|
goto out; |
|
} |
|
|
|
time_start = ktime_get(); |
|
ret = genpd->power_on(genpd); |
|
if (ret) |
|
goto err; |
|
|
|
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
|
if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
|
goto out; |
|
|
|
genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
|
genpd->max_off_time_changed = true; |
|
pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
|
genpd->name, "on", elapsed_ns); |
|
|
|
out: |
|
raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
|
return 0; |
|
err: |
|
raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, |
|
NULL); |
|
return ret; |
|
} |
|
|
|
static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
|
{ |
|
unsigned int state_idx = genpd->state_idx; |
|
ktime_t time_start; |
|
s64 elapsed_ns; |
|
int ret; |
|
|
|
/* Notify consumers that we are about to power off. */ |
|
ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
|
GENPD_NOTIFY_PRE_OFF, |
|
GENPD_NOTIFY_ON, NULL); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
return ret; |
|
|
|
if (!genpd->power_off) |
|
goto out; |
|
|
|
if (!timed) { |
|
ret = genpd->power_off(genpd); |
|
if (ret) |
|
goto busy; |
|
|
|
goto out; |
|
} |
|
|
|
time_start = ktime_get(); |
|
ret = genpd->power_off(genpd); |
|
if (ret) |
|
goto busy; |
|
|
|
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
|
if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
|
goto out; |
|
|
|
genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
|
genpd->max_off_time_changed = true; |
|
pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
|
genpd->name, "off", elapsed_ns); |
|
|
|
out: |
|
raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, |
|
NULL); |
|
return 0; |
|
busy: |
|
raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
|
return ret; |
|
} |
|
|
|
/** |
|
* genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
|
* @genpd: PM domain to power off. |
|
* |
|
* Queue up the execution of genpd_power_off() unless it's already been done |
|
* before. |
|
*/ |
|
static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
|
{ |
|
queue_work(pm_wq, &genpd->power_off_work); |
|
} |
|
|
|
/** |
|
* genpd_power_off - Remove power from a given PM domain. |
|
* @genpd: PM domain to power down. |
|
* @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
|
* RPM status of the releated device is in an intermediate state, not yet turned |
|
* into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not |
|
* be RPM_SUSPENDED, while it tries to power off the PM domain. |
|
* |
|
* If all of the @genpd's devices have been suspended and all of its subdomains |
|
* have been powered down, remove power from @genpd. |
|
*/ |
|
static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
|
unsigned int depth) |
|
{ |
|
struct pm_domain_data *pdd; |
|
struct gpd_link *link; |
|
unsigned int not_suspended = 0; |
|
int ret; |
|
|
|
/* |
|
* Do not try to power off the domain in the following situations: |
|
* (1) The domain is already in the "power off" state. |
|
* (2) System suspend is in progress. |
|
*/ |
|
if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
|
return 0; |
|
|
|
/* |
|
* Abort power off for the PM domain in the following situations: |
|
* (1) The domain is configured as always on. |
|
* (2) When the domain has a subdomain being powered on. |
|
*/ |
|
if (genpd_is_always_on(genpd) || |
|
genpd_is_rpm_always_on(genpd) || |
|
atomic_read(&genpd->sd_count) > 0) |
|
return -EBUSY; |
|
|
|
list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
|
enum pm_qos_flags_status stat; |
|
|
|
stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
|
if (stat > PM_QOS_FLAGS_NONE) |
|
return -EBUSY; |
|
|
|
/* |
|
* Do not allow PM domain to be powered off, when an IRQ safe |
|
* device is part of a non-IRQ safe domain. |
|
*/ |
|
if (!pm_runtime_suspended(pdd->dev) || |
|
irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) |
|
not_suspended++; |
|
} |
|
|
|
if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
|
return -EBUSY; |
|
|
|
if (genpd->gov && genpd->gov->power_down_ok) { |
|
if (!genpd->gov->power_down_ok(&genpd->domain)) |
|
return -EAGAIN; |
|
} |
|
|
|
/* Default to shallowest state. */ |
|
if (!genpd->gov) |
|
genpd->state_idx = 0; |
|
|
|
/* Don't power off, if a child domain is waiting to power on. */ |
|
if (atomic_read(&genpd->sd_count) > 0) |
|
return -EBUSY; |
|
|
|
ret = _genpd_power_off(genpd, true); |
|
if (ret) { |
|
genpd->states[genpd->state_idx].rejected++; |
|
return ret; |
|
} |
|
|
|
genpd->status = GENPD_STATE_OFF; |
|
genpd_update_accounting(genpd); |
|
genpd->states[genpd->state_idx].usage++; |
|
|
|
list_for_each_entry(link, &genpd->child_links, child_node) { |
|
genpd_sd_counter_dec(link->parent); |
|
genpd_lock_nested(link->parent, depth + 1); |
|
genpd_power_off(link->parent, false, depth + 1); |
|
genpd_unlock(link->parent); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* genpd_power_on - Restore power to a given PM domain and its parents. |
|
* @genpd: PM domain to power up. |
|
* @depth: nesting count for lockdep. |
|
* |
|
* Restore power to @genpd and all of its parents so that it is possible to |
|
* resume a device belonging to it. |
|
*/ |
|
static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
|
{ |
|
struct gpd_link *link; |
|
int ret = 0; |
|
|
|
if (genpd_status_on(genpd)) |
|
return 0; |
|
|
|
/* |
|
* The list is guaranteed not to change while the loop below is being |
|
* executed, unless one of the parents' .power_on() callbacks fiddles |
|
* with it. |
|
*/ |
|
list_for_each_entry(link, &genpd->child_links, child_node) { |
|
struct generic_pm_domain *parent = link->parent; |
|
|
|
genpd_sd_counter_inc(parent); |
|
|
|
genpd_lock_nested(parent, depth + 1); |
|
ret = genpd_power_on(parent, depth + 1); |
|
genpd_unlock(parent); |
|
|
|
if (ret) { |
|
genpd_sd_counter_dec(parent); |
|
goto err; |
|
} |
|
} |
|
|
|
ret = _genpd_power_on(genpd, true); |
|
if (ret) |
|
goto err; |
|
|
|
genpd->status = GENPD_STATE_ON; |
|
genpd_update_accounting(genpd); |
|
|
|
return 0; |
|
|
|
err: |
|
list_for_each_entry_continue_reverse(link, |
|
&genpd->child_links, |
|
child_node) { |
|
genpd_sd_counter_dec(link->parent); |
|
genpd_lock_nested(link->parent, depth + 1); |
|
genpd_power_off(link->parent, false, depth + 1); |
|
genpd_unlock(link->parent); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int genpd_dev_pm_start(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd = dev_to_genpd(dev); |
|
|
|
return genpd_start_dev(genpd, dev); |
|
} |
|
|
|
static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
|
unsigned long val, void *ptr) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
struct device *dev; |
|
|
|
gpd_data = container_of(nb, struct generic_pm_domain_data, nb); |
|
dev = gpd_data->base.dev; |
|
|
|
for (;;) { |
|
struct generic_pm_domain *genpd; |
|
struct pm_domain_data *pdd; |
|
|
|
spin_lock_irq(&dev->power.lock); |
|
|
|
pdd = dev->power.subsys_data ? |
|
dev->power.subsys_data->domain_data : NULL; |
|
if (pdd) { |
|
to_gpd_data(pdd)->td.constraint_changed = true; |
|
genpd = dev_to_genpd(dev); |
|
} else { |
|
genpd = ERR_PTR(-ENODATA); |
|
} |
|
|
|
spin_unlock_irq(&dev->power.lock); |
|
|
|
if (!IS_ERR(genpd)) { |
|
genpd_lock(genpd); |
|
genpd->max_off_time_changed = true; |
|
genpd_unlock(genpd); |
|
} |
|
|
|
dev = dev->parent; |
|
if (!dev || dev->power.ignore_children) |
|
break; |
|
} |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
/** |
|
* 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); |
|
|
|
genpd_lock(genpd); |
|
genpd_power_off(genpd, false, 0); |
|
genpd_unlock(genpd); |
|
} |
|
|
|
/** |
|
* __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks |
|
* @dev: Device to handle. |
|
*/ |
|
static int __genpd_runtime_suspend(struct device *dev) |
|
{ |
|
int (*cb)(struct device *__dev); |
|
|
|
if (dev->type && dev->type->pm) |
|
cb = dev->type->pm->runtime_suspend; |
|
else if (dev->class && dev->class->pm) |
|
cb = dev->class->pm->runtime_suspend; |
|
else if (dev->bus && dev->bus->pm) |
|
cb = dev->bus->pm->runtime_suspend; |
|
else |
|
cb = NULL; |
|
|
|
if (!cb && dev->driver && dev->driver->pm) |
|
cb = dev->driver->pm->runtime_suspend; |
|
|
|
return cb ? cb(dev) : 0; |
|
} |
|
|
|
/** |
|
* __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks |
|
* @dev: Device to handle. |
|
*/ |
|
static int __genpd_runtime_resume(struct device *dev) |
|
{ |
|
int (*cb)(struct device *__dev); |
|
|
|
if (dev->type && dev->type->pm) |
|
cb = dev->type->pm->runtime_resume; |
|
else if (dev->class && dev->class->pm) |
|
cb = dev->class->pm->runtime_resume; |
|
else if (dev->bus && dev->bus->pm) |
|
cb = dev->bus->pm->runtime_resume; |
|
else |
|
cb = NULL; |
|
|
|
if (!cb && dev->driver && dev->driver->pm) |
|
cb = dev->driver->pm->runtime_resume; |
|
|
|
return cb ? cb(dev) : 0; |
|
} |
|
|
|
/** |
|
* 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 genpd_runtime_suspend(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
bool (*suspend_ok)(struct device *__dev); |
|
struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
|
bool runtime_pm = pm_runtime_enabled(dev); |
|
ktime_t time_start; |
|
s64 elapsed_ns; |
|
int ret; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
/* |
|
* A runtime PM centric subsystem/driver may re-use the runtime PM |
|
* callbacks for other purposes than runtime PM. In those scenarios |
|
* runtime PM is disabled. Under these circumstances, we shall skip |
|
* validating/measuring the PM QoS latency. |
|
*/ |
|
suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
|
if (runtime_pm && suspend_ok && !suspend_ok(dev)) |
|
return -EBUSY; |
|
|
|
/* Measure suspend latency. */ |
|
time_start = 0; |
|
if (runtime_pm) |
|
time_start = ktime_get(); |
|
|
|
ret = __genpd_runtime_suspend(dev); |
|
if (ret) |
|
return ret; |
|
|
|
ret = genpd_stop_dev(genpd, dev); |
|
if (ret) { |
|
__genpd_runtime_resume(dev); |
|
return ret; |
|
} |
|
|
|
/* Update suspend latency value if the measured time exceeds it. */ |
|
if (runtime_pm) { |
|
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
|
if (elapsed_ns > td->suspend_latency_ns) { |
|
td->suspend_latency_ns = elapsed_ns; |
|
dev_dbg(dev, "suspend latency exceeded, %lld ns\n", |
|
elapsed_ns); |
|
genpd->max_off_time_changed = true; |
|
td->constraint_changed = true; |
|
} |
|
} |
|
|
|
/* |
|
* If power.irq_safe is set, this routine may be run with |
|
* IRQs disabled, so suspend only if the PM domain also is irq_safe. |
|
*/ |
|
if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
|
return 0; |
|
|
|
genpd_lock(genpd); |
|
genpd_power_off(genpd, true, 0); |
|
genpd_unlock(genpd); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* 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 genpd_runtime_resume(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
|
bool runtime_pm = pm_runtime_enabled(dev); |
|
ktime_t time_start; |
|
s64 elapsed_ns; |
|
int ret; |
|
bool timed = true; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
/* |
|
* As we don't power off a non IRQ safe domain, which holds |
|
* an IRQ safe device, we don't need to restore power to it. |
|
*/ |
|
if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { |
|
timed = false; |
|
goto out; |
|
} |
|
|
|
genpd_lock(genpd); |
|
ret = genpd_power_on(genpd, 0); |
|
genpd_unlock(genpd); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
out: |
|
/* Measure resume latency. */ |
|
time_start = 0; |
|
if (timed && runtime_pm) |
|
time_start = ktime_get(); |
|
|
|
ret = genpd_start_dev(genpd, dev); |
|
if (ret) |
|
goto err_poweroff; |
|
|
|
ret = __genpd_runtime_resume(dev); |
|
if (ret) |
|
goto err_stop; |
|
|
|
/* Update resume latency value if the measured time exceeds it. */ |
|
if (timed && runtime_pm) { |
|
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
|
if (elapsed_ns > td->resume_latency_ns) { |
|
td->resume_latency_ns = elapsed_ns; |
|
dev_dbg(dev, "resume latency exceeded, %lld ns\n", |
|
elapsed_ns); |
|
genpd->max_off_time_changed = true; |
|
td->constraint_changed = true; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
err_stop: |
|
genpd_stop_dev(genpd, dev); |
|
err_poweroff: |
|
if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { |
|
genpd_lock(genpd); |
|
genpd_power_off(genpd, true, 0); |
|
genpd_unlock(genpd); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static bool pd_ignore_unused; |
|
static int __init pd_ignore_unused_setup(char *__unused) |
|
{ |
|
pd_ignore_unused = true; |
|
return 1; |
|
} |
|
__setup("pd_ignore_unused", pd_ignore_unused_setup); |
|
|
|
/** |
|
* genpd_power_off_unused - Power off all PM domains with no devices in use. |
|
*/ |
|
static int __init genpd_power_off_unused(void) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
|
|
if (pd_ignore_unused) { |
|
pr_warn("genpd: Not disabling unused power domains\n"); |
|
return 0; |
|
} |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
|
genpd_queue_power_off_work(genpd); |
|
|
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return 0; |
|
} |
|
late_initcall(genpd_power_off_unused); |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
|
|
/** |
|
* genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
|
* @genpd: PM domain to power off, if possible. |
|
* @use_lock: use the lock. |
|
* @depth: nesting count for lockdep. |
|
* |
|
* Check if the given PM domain can be powered off (during system suspend or |
|
* hibernation) and do that if so. Also, in that case propagate to its parents. |
|
* |
|
* This function is only called in "noirq" and "syscore" stages of system power |
|
* transitions. The "noirq" callbacks may be executed asynchronously, thus in |
|
* these cases the lock must be held. |
|
*/ |
|
static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
|
unsigned int depth) |
|
{ |
|
struct gpd_link *link; |
|
|
|
if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
|
return; |
|
|
|
if (genpd->suspended_count != genpd->device_count |
|
|| atomic_read(&genpd->sd_count) > 0) |
|
return; |
|
|
|
/* Choose the deepest state when suspending */ |
|
genpd->state_idx = genpd->state_count - 1; |
|
if (_genpd_power_off(genpd, false)) |
|
return; |
|
|
|
genpd->status = GENPD_STATE_OFF; |
|
|
|
list_for_each_entry(link, &genpd->child_links, child_node) { |
|
genpd_sd_counter_dec(link->parent); |
|
|
|
if (use_lock) |
|
genpd_lock_nested(link->parent, depth + 1); |
|
|
|
genpd_sync_power_off(link->parent, use_lock, depth + 1); |
|
|
|
if (use_lock) |
|
genpd_unlock(link->parent); |
|
} |
|
} |
|
|
|
/** |
|
* genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
|
* @genpd: PM domain to power on. |
|
* @use_lock: use the lock. |
|
* @depth: nesting count for lockdep. |
|
* |
|
* This function is only called in "noirq" and "syscore" stages of system power |
|
* transitions. The "noirq" callbacks may be executed asynchronously, thus in |
|
* these cases the lock must be held. |
|
*/ |
|
static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
|
unsigned int depth) |
|
{ |
|
struct gpd_link *link; |
|
|
|
if (genpd_status_on(genpd)) |
|
return; |
|
|
|
list_for_each_entry(link, &genpd->child_links, child_node) { |
|
genpd_sd_counter_inc(link->parent); |
|
|
|
if (use_lock) |
|
genpd_lock_nested(link->parent, depth + 1); |
|
|
|
genpd_sync_power_on(link->parent, use_lock, depth + 1); |
|
|
|
if (use_lock) |
|
genpd_unlock(link->parent); |
|
} |
|
|
|
_genpd_power_on(genpd, false); |
|
genpd->status = GENPD_STATE_ON; |
|
} |
|
|
|
/** |
|
* resume_needed - Check whether to resume a device before system suspend. |
|
* @dev: Device to check. |
|
* @genpd: PM domain the device belongs to. |
|
* |
|
* There are two cases in which a device that can wake up the system from sleep |
|
* states should be resumed by genpd_prepare(): (1) if the device is enabled |
|
* to wake up the system and it has to remain active for this purpose while the |
|
* system is in the sleep state and (2) if the device is not enabled to wake up |
|
* the system from sleep states and it generally doesn't generate wakeup signals |
|
* by itself (those signals are generated on its behalf by other parts of the |
|
* system). In the latter case it may be necessary to reconfigure the device's |
|
* wakeup settings during system suspend, because it may have been set up to |
|
* signal remote wakeup from the system's working state as needed by runtime PM. |
|
* Return 'true' in either of the above cases. |
|
*/ |
|
static bool resume_needed(struct device *dev, |
|
const struct generic_pm_domain *genpd) |
|
{ |
|
bool active_wakeup; |
|
|
|
if (!device_can_wakeup(dev)) |
|
return false; |
|
|
|
active_wakeup = genpd_is_active_wakeup(genpd); |
|
return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
|
} |
|
|
|
/** |
|
* genpd_prepare - Start power transition of a device in a PM domain. |
|
* @dev: Device to start the transition of. |
|
* |
|
* Start a power transition of a device (during a system-wide power transition) |
|
* 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 genpd_prepare(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
/* |
|
* If a wakeup request is pending for the device, it should be woken up |
|
* at this point and a system wakeup event should be reported if it's |
|
* set up to wake up the system from sleep states. |
|
*/ |
|
if (resume_needed(dev, genpd)) |
|
pm_runtime_resume(dev); |
|
|
|
genpd_lock(genpd); |
|
|
|
if (genpd->prepared_count++ == 0) |
|
genpd->suspended_count = 0; |
|
|
|
genpd_unlock(genpd); |
|
|
|
ret = pm_generic_prepare(dev); |
|
if (ret < 0) { |
|
genpd_lock(genpd); |
|
|
|
genpd->prepared_count--; |
|
|
|
genpd_unlock(genpd); |
|
} |
|
|
|
/* Never return 1, as genpd don't cope with the direct_complete path. */ |
|
return ret >= 0 ? 0 : ret; |
|
} |
|
|
|
/** |
|
* genpd_finish_suspend - Completion of suspend or hibernation of device in an |
|
* I/O pm domain. |
|
* @dev: Device to suspend. |
|
* @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
|
* |
|
* Stop the device and remove power from the domain if all devices in it have |
|
* been stopped. |
|
*/ |
|
static int genpd_finish_suspend(struct device *dev, bool poweroff) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret = 0; |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
if (poweroff) |
|
ret = pm_generic_poweroff_noirq(dev); |
|
else |
|
ret = pm_generic_suspend_noirq(dev); |
|
if (ret) |
|
return ret; |
|
|
|
if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
|
return 0; |
|
|
|
if (genpd->dev_ops.stop && genpd->dev_ops.start && |
|
!pm_runtime_status_suspended(dev)) { |
|
ret = genpd_stop_dev(genpd, dev); |
|
if (ret) { |
|
if (poweroff) |
|
pm_generic_restore_noirq(dev); |
|
else |
|
pm_generic_resume_noirq(dev); |
|
return ret; |
|
} |
|
} |
|
|
|
genpd_lock(genpd); |
|
genpd->suspended_count++; |
|
genpd_sync_power_off(genpd, true, 0); |
|
genpd_unlock(genpd); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
|
* @dev: Device to suspend. |
|
* |
|
* Stop the device and remove power from the domain if all devices in it have |
|
* been stopped. |
|
*/ |
|
static int genpd_suspend_noirq(struct device *dev) |
|
{ |
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
return genpd_finish_suspend(dev, false); |
|
} |
|
|
|
/** |
|
* genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
|
* @dev: Device to resume. |
|
* |
|
* Restore power to the device's PM domain, if necessary, and start the device. |
|
*/ |
|
static int genpd_resume_noirq(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
|
return pm_generic_resume_noirq(dev); |
|
|
|
genpd_lock(genpd); |
|
genpd_sync_power_on(genpd, true, 0); |
|
genpd->suspended_count--; |
|
genpd_unlock(genpd); |
|
|
|
if (genpd->dev_ops.stop && genpd->dev_ops.start && |
|
!pm_runtime_status_suspended(dev)) { |
|
ret = genpd_start_dev(genpd, dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return pm_generic_resume_noirq(dev); |
|
} |
|
|
|
/** |
|
* genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
|
* @dev: Device to freeze. |
|
* |
|
* Carry out a late freeze 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 power domain consisting of I/O |
|
* devices. |
|
*/ |
|
static int genpd_freeze_noirq(struct device *dev) |
|
{ |
|
const struct generic_pm_domain *genpd; |
|
int ret = 0; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
ret = pm_generic_freeze_noirq(dev); |
|
if (ret) |
|
return ret; |
|
|
|
if (genpd->dev_ops.stop && genpd->dev_ops.start && |
|
!pm_runtime_status_suspended(dev)) |
|
ret = genpd_stop_dev(genpd, dev); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
|
* @dev: Device to thaw. |
|
* |
|
* Start the device, unless power has been removed from the domain already |
|
* before the system transition. |
|
*/ |
|
static int genpd_thaw_noirq(struct device *dev) |
|
{ |
|
const struct generic_pm_domain *genpd; |
|
int ret = 0; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
if (genpd->dev_ops.stop && genpd->dev_ops.start && |
|
!pm_runtime_status_suspended(dev)) { |
|
ret = genpd_start_dev(genpd, dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return pm_generic_thaw_noirq(dev); |
|
} |
|
|
|
/** |
|
* genpd_poweroff_noirq - Completion of hibernation of device in an |
|
* I/O PM domain. |
|
* @dev: Device to poweroff. |
|
* |
|
* Stop the device and remove power from the domain if all devices in it have |
|
* been stopped. |
|
*/ |
|
static int genpd_poweroff_noirq(struct device *dev) |
|
{ |
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
return genpd_finish_suspend(dev, true); |
|
} |
|
|
|
/** |
|
* genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
|
* @dev: Device to resume. |
|
* |
|
* Make sure the domain will be in the same power state as before the |
|
* hibernation the system is resuming from and start the device if necessary. |
|
*/ |
|
static int genpd_restore_noirq(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret = 0; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return -EINVAL; |
|
|
|
/* |
|
* At this point suspended_count == 0 means we are being run for the |
|
* first time for the given domain in the present cycle. |
|
*/ |
|
genpd_lock(genpd); |
|
if (genpd->suspended_count++ == 0) { |
|
/* |
|
* The boot kernel might put the domain into arbitrary state, |
|
* so make it appear as powered off to genpd_sync_power_on(), |
|
* so that it tries to power it on in case it was really off. |
|
*/ |
|
genpd->status = GENPD_STATE_OFF; |
|
} |
|
|
|
genpd_sync_power_on(genpd, true, 0); |
|
genpd_unlock(genpd); |
|
|
|
if (genpd->dev_ops.stop && genpd->dev_ops.start && |
|
!pm_runtime_status_suspended(dev)) { |
|
ret = genpd_start_dev(genpd, dev); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return pm_generic_restore_noirq(dev); |
|
} |
|
|
|
/** |
|
* genpd_complete - Complete power transition of a device in a power domain. |
|
* @dev: Device to complete the transition of. |
|
* |
|
* Complete a power transition of a device (during a system-wide power |
|
* transition) under the assumption that its pm_domain field points to the |
|
* domain member of an object of type struct generic_pm_domain representing |
|
* a power domain consisting of I/O devices. |
|
*/ |
|
static void genpd_complete(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
genpd = dev_to_genpd(dev); |
|
if (IS_ERR(genpd)) |
|
return; |
|
|
|
pm_generic_complete(dev); |
|
|
|
genpd_lock(genpd); |
|
|
|
genpd->prepared_count--; |
|
if (!genpd->prepared_count) |
|
genpd_queue_power_off_work(genpd); |
|
|
|
genpd_unlock(genpd); |
|
} |
|
|
|
static void genpd_switch_state(struct device *dev, bool suspend) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
bool use_lock; |
|
|
|
genpd = dev_to_genpd_safe(dev); |
|
if (!genpd) |
|
return; |
|
|
|
use_lock = genpd_is_irq_safe(genpd); |
|
|
|
if (use_lock) |
|
genpd_lock(genpd); |
|
|
|
if (suspend) { |
|
genpd->suspended_count++; |
|
genpd_sync_power_off(genpd, use_lock, 0); |
|
} else { |
|
genpd_sync_power_on(genpd, use_lock, 0); |
|
genpd->suspended_count--; |
|
} |
|
|
|
if (use_lock) |
|
genpd_unlock(genpd); |
|
} |
|
|
|
/** |
|
* dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev |
|
* @dev: The device that is attached to the genpd, that can be suspended. |
|
* |
|
* This routine should typically be called for a device that needs to be |
|
* suspended during the syscore suspend phase. It may also be called during |
|
* suspend-to-idle to suspend a corresponding CPU device that is attached to a |
|
* genpd. |
|
*/ |
|
void dev_pm_genpd_suspend(struct device *dev) |
|
{ |
|
genpd_switch_state(dev, true); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); |
|
|
|
/** |
|
* dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev |
|
* @dev: The device that is attached to the genpd, which needs to be resumed. |
|
* |
|
* This routine should typically be called for a device that needs to be resumed |
|
* during the syscore resume phase. It may also be called during suspend-to-idle |
|
* to resume a corresponding CPU device that is attached to a genpd. |
|
*/ |
|
void dev_pm_genpd_resume(struct device *dev) |
|
{ |
|
genpd_switch_state(dev, false); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); |
|
|
|
#else /* !CONFIG_PM_SLEEP */ |
|
|
|
#define genpd_prepare NULL |
|
#define genpd_suspend_noirq NULL |
|
#define genpd_resume_noirq NULL |
|
#define genpd_freeze_noirq NULL |
|
#define genpd_thaw_noirq NULL |
|
#define genpd_poweroff_noirq NULL |
|
#define genpd_restore_noirq NULL |
|
#define genpd_complete NULL |
|
|
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
int ret; |
|
|
|
ret = dev_pm_get_subsys_data(dev); |
|
if (ret) |
|
return ERR_PTR(ret); |
|
|
|
gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
|
if (!gpd_data) { |
|
ret = -ENOMEM; |
|
goto err_put; |
|
} |
|
|
|
gpd_data->base.dev = dev; |
|
gpd_data->td.constraint_changed = true; |
|
gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
|
gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
|
gpd_data->next_wakeup = KTIME_MAX; |
|
|
|
spin_lock_irq(&dev->power.lock); |
|
|
|
if (dev->power.subsys_data->domain_data) { |
|
ret = -EINVAL; |
|
goto err_free; |
|
} |
|
|
|
dev->power.subsys_data->domain_data = &gpd_data->base; |
|
|
|
spin_unlock_irq(&dev->power.lock); |
|
|
|
return gpd_data; |
|
|
|
err_free: |
|
spin_unlock_irq(&dev->power.lock); |
|
kfree(gpd_data); |
|
err_put: |
|
dev_pm_put_subsys_data(dev); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
static void genpd_free_dev_data(struct device *dev, |
|
struct generic_pm_domain_data *gpd_data) |
|
{ |
|
spin_lock_irq(&dev->power.lock); |
|
|
|
dev->power.subsys_data->domain_data = NULL; |
|
|
|
spin_unlock_irq(&dev->power.lock); |
|
|
|
kfree(gpd_data); |
|
dev_pm_put_subsys_data(dev); |
|
} |
|
|
|
static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
|
int cpu, bool set, unsigned int depth) |
|
{ |
|
struct gpd_link *link; |
|
|
|
if (!genpd_is_cpu_domain(genpd)) |
|
return; |
|
|
|
list_for_each_entry(link, &genpd->child_links, child_node) { |
|
struct generic_pm_domain *parent = link->parent; |
|
|
|
genpd_lock_nested(parent, depth + 1); |
|
genpd_update_cpumask(parent, cpu, set, depth + 1); |
|
genpd_unlock(parent); |
|
} |
|
|
|
if (set) |
|
cpumask_set_cpu(cpu, genpd->cpus); |
|
else |
|
cpumask_clear_cpu(cpu, genpd->cpus); |
|
} |
|
|
|
static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
|
{ |
|
if (cpu >= 0) |
|
genpd_update_cpumask(genpd, cpu, true, 0); |
|
} |
|
|
|
static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) |
|
{ |
|
if (cpu >= 0) |
|
genpd_update_cpumask(genpd, cpu, false, 0); |
|
} |
|
|
|
static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) |
|
{ |
|
int cpu; |
|
|
|
if (!genpd_is_cpu_domain(genpd)) |
|
return -1; |
|
|
|
for_each_possible_cpu(cpu) { |
|
if (get_cpu_device(cpu) == dev) |
|
return cpu; |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
|
struct device *base_dev) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
int ret; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
|
return -EINVAL; |
|
|
|
gpd_data = genpd_alloc_dev_data(dev); |
|
if (IS_ERR(gpd_data)) |
|
return PTR_ERR(gpd_data); |
|
|
|
gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
|
|
|
ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
|
if (ret) |
|
goto out; |
|
|
|
genpd_lock(genpd); |
|
|
|
genpd_set_cpumask(genpd, gpd_data->cpu); |
|
dev_pm_domain_set(dev, &genpd->domain); |
|
|
|
genpd->device_count++; |
|
genpd->max_off_time_changed = true; |
|
|
|
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
|
|
|
genpd_unlock(genpd); |
|
out: |
|
if (ret) |
|
genpd_free_dev_data(dev, gpd_data); |
|
else |
|
dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
|
DEV_PM_QOS_RESUME_LATENCY); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
ret = genpd_add_device(genpd, dev, dev); |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
|
|
|
static int genpd_remove_device(struct generic_pm_domain *genpd, |
|
struct device *dev) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
struct pm_domain_data *pdd; |
|
int ret = 0; |
|
|
|
dev_dbg(dev, "%s()\n", __func__); |
|
|
|
pdd = dev->power.subsys_data->domain_data; |
|
gpd_data = to_gpd_data(pdd); |
|
dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
|
DEV_PM_QOS_RESUME_LATENCY); |
|
|
|
genpd_lock(genpd); |
|
|
|
if (genpd->prepared_count > 0) { |
|
ret = -EAGAIN; |
|
goto out; |
|
} |
|
|
|
genpd->device_count--; |
|
genpd->max_off_time_changed = true; |
|
|
|
genpd_clear_cpumask(genpd, gpd_data->cpu); |
|
dev_pm_domain_set(dev, NULL); |
|
|
|
list_del_init(&pdd->list_node); |
|
|
|
genpd_unlock(genpd); |
|
|
|
if (genpd->detach_dev) |
|
genpd->detach_dev(genpd, dev); |
|
|
|
genpd_free_dev_data(dev, gpd_data); |
|
|
|
return 0; |
|
|
|
out: |
|
genpd_unlock(genpd); |
|
dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* pm_genpd_remove_device - Remove a device from an I/O PM domain. |
|
* @dev: Device to be removed. |
|
*/ |
|
int pm_genpd_remove_device(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
|
|
|
if (!genpd) |
|
return -EINVAL; |
|
|
|
return genpd_remove_device(genpd, dev); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
|
|
|
/** |
|
* dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev |
|
* |
|
* @dev: Device that should be associated with the notifier |
|
* @nb: The notifier block to register |
|
* |
|
* Users may call this function to add a genpd power on/off notifier for an |
|
* attached @dev. Only one notifier per device is allowed. The notifier is |
|
* sent when genpd is powering on/off the PM domain. |
|
* |
|
* It is assumed that the user guarantee that the genpd wouldn't be detached |
|
* while this routine is getting called. |
|
* |
|
* Returns 0 on success and negative error values on failures. |
|
*/ |
|
int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
struct generic_pm_domain_data *gpd_data; |
|
int ret; |
|
|
|
genpd = dev_to_genpd_safe(dev); |
|
if (!genpd) |
|
return -ENODEV; |
|
|
|
if (WARN_ON(!dev->power.subsys_data || |
|
!dev->power.subsys_data->domain_data)) |
|
return -EINVAL; |
|
|
|
gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
|
if (gpd_data->power_nb) |
|
return -EEXIST; |
|
|
|
genpd_lock(genpd); |
|
ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); |
|
genpd_unlock(genpd); |
|
|
|
if (ret) { |
|
dev_warn(dev, "failed to add notifier for PM domain %s\n", |
|
genpd->name); |
|
return ret; |
|
} |
|
|
|
gpd_data->power_nb = nb; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); |
|
|
|
/** |
|
* dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev |
|
* |
|
* @dev: Device that is associated with the notifier |
|
* |
|
* Users may call this function to remove a genpd power on/off notifier for an |
|
* attached @dev. |
|
* |
|
* It is assumed that the user guarantee that the genpd wouldn't be detached |
|
* while this routine is getting called. |
|
* |
|
* Returns 0 on success and negative error values on failures. |
|
*/ |
|
int dev_pm_genpd_remove_notifier(struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
struct generic_pm_domain_data *gpd_data; |
|
int ret; |
|
|
|
genpd = dev_to_genpd_safe(dev); |
|
if (!genpd) |
|
return -ENODEV; |
|
|
|
if (WARN_ON(!dev->power.subsys_data || |
|
!dev->power.subsys_data->domain_data)) |
|
return -EINVAL; |
|
|
|
gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
|
if (!gpd_data->power_nb) |
|
return -ENODEV; |
|
|
|
genpd_lock(genpd); |
|
ret = raw_notifier_chain_unregister(&genpd->power_notifiers, |
|
gpd_data->power_nb); |
|
genpd_unlock(genpd); |
|
|
|
if (ret) { |
|
dev_warn(dev, "failed to remove notifier for PM domain %s\n", |
|
genpd->name); |
|
return ret; |
|
} |
|
|
|
gpd_data->power_nb = NULL; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); |
|
|
|
static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
|
struct generic_pm_domain *subdomain) |
|
{ |
|
struct gpd_link *link, *itr; |
|
int ret = 0; |
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
|
|| genpd == subdomain) |
|
return -EINVAL; |
|
|
|
/* |
|
* If the domain can be powered on/off in an IRQ safe |
|
* context, ensure that the subdomain can also be |
|
* powered on/off in that context. |
|
*/ |
|
if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { |
|
WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
|
genpd->name, subdomain->name); |
|
return -EINVAL; |
|
} |
|
|
|
link = kzalloc(sizeof(*link), GFP_KERNEL); |
|
if (!link) |
|
return -ENOMEM; |
|
|
|
genpd_lock(subdomain); |
|
genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
|
|
|
if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
|
if (itr->child == subdomain && itr->parent == genpd) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
link->parent = genpd; |
|
list_add_tail(&link->parent_node, &genpd->parent_links); |
|
link->child = subdomain; |
|
list_add_tail(&link->child_node, &subdomain->child_links); |
|
if (genpd_status_on(subdomain)) |
|
genpd_sd_counter_inc(genpd); |
|
|
|
out: |
|
genpd_unlock(genpd); |
|
genpd_unlock(subdomain); |
|
if (ret) |
|
kfree(link); |
|
return ret; |
|
} |
|
|
|
/** |
|
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
|
* @genpd: Leader PM domain to add the subdomain to. |
|
* @subdomain: Subdomain to be added. |
|
*/ |
|
int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
|
struct generic_pm_domain *subdomain) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
ret = genpd_add_subdomain(genpd, subdomain); |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
|
|
|
/** |
|
* pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
|
* @genpd: Leader PM domain to remove the subdomain from. |
|
* @subdomain: Subdomain to be removed. |
|
*/ |
|
int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
|
struct generic_pm_domain *subdomain) |
|
{ |
|
struct gpd_link *l, *link; |
|
int ret = -EINVAL; |
|
|
|
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
|
return -EINVAL; |
|
|
|
genpd_lock(subdomain); |
|
genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
|
|
|
if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
|
pr_warn("%s: unable to remove subdomain %s\n", |
|
genpd->name, subdomain->name); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
|
if (link->child != subdomain) |
|
continue; |
|
|
|
list_del(&link->parent_node); |
|
list_del(&link->child_node); |
|
kfree(link); |
|
if (genpd_status_on(subdomain)) |
|
genpd_sd_counter_dec(genpd); |
|
|
|
ret = 0; |
|
break; |
|
} |
|
|
|
out: |
|
genpd_unlock(genpd); |
|
genpd_unlock(subdomain); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
|
|
|
static void genpd_free_default_power_state(struct genpd_power_state *states, |
|
unsigned int state_count) |
|
{ |
|
kfree(states); |
|
} |
|
|
|
static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
|
{ |
|
struct genpd_power_state *state; |
|
|
|
state = kzalloc(sizeof(*state), GFP_KERNEL); |
|
if (!state) |
|
return -ENOMEM; |
|
|
|
genpd->states = state; |
|
genpd->state_count = 1; |
|
genpd->free_states = genpd_free_default_power_state; |
|
|
|
return 0; |
|
} |
|
|
|
static void genpd_lock_init(struct generic_pm_domain *genpd) |
|
{ |
|
if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { |
|
spin_lock_init(&genpd->slock); |
|
genpd->lock_ops = &genpd_spin_ops; |
|
} else { |
|
mutex_init(&genpd->mlock); |
|
genpd->lock_ops = &genpd_mtx_ops; |
|
} |
|
} |
|
|
|
/** |
|
* 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. |
|
* |
|
* Returns 0 on successful initialization, else a negative error code. |
|
*/ |
|
int pm_genpd_init(struct generic_pm_domain *genpd, |
|
struct dev_power_governor *gov, bool is_off) |
|
{ |
|
int ret; |
|
|
|
if (IS_ERR_OR_NULL(genpd)) |
|
return -EINVAL; |
|
|
|
INIT_LIST_HEAD(&genpd->parent_links); |
|
INIT_LIST_HEAD(&genpd->child_links); |
|
INIT_LIST_HEAD(&genpd->dev_list); |
|
RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
|
genpd_lock_init(genpd); |
|
genpd->gov = gov; |
|
INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); |
|
atomic_set(&genpd->sd_count, 0); |
|
genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
|
genpd->device_count = 0; |
|
genpd->max_off_time_ns = -1; |
|
genpd->max_off_time_changed = true; |
|
genpd->provider = NULL; |
|
genpd->has_provider = false; |
|
genpd->accounting_time = ktime_get(); |
|
genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
|
genpd->domain.ops.runtime_resume = genpd_runtime_resume; |
|
genpd->domain.ops.prepare = genpd_prepare; |
|
genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; |
|
genpd->domain.ops.resume_noirq = genpd_resume_noirq; |
|
genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; |
|
genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; |
|
genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; |
|
genpd->domain.ops.restore_noirq = genpd_restore_noirq; |
|
genpd->domain.ops.complete = genpd_complete; |
|
genpd->domain.start = genpd_dev_pm_start; |
|
|
|
if (genpd->flags & GENPD_FLAG_PM_CLK) { |
|
genpd->dev_ops.stop = pm_clk_suspend; |
|
genpd->dev_ops.start = pm_clk_resume; |
|
} |
|
|
|
/* Always-on domains must be powered on at initialization. */ |
|
if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
|
!genpd_status_on(genpd)) |
|
return -EINVAL; |
|
|
|
if (genpd_is_cpu_domain(genpd) && |
|
!zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
/* Use only one "off" state if there were no states declared */ |
|
if (genpd->state_count == 0) { |
|
ret = genpd_set_default_power_state(genpd); |
|
if (ret) { |
|
if (genpd_is_cpu_domain(genpd)) |
|
free_cpumask_var(genpd->cpus); |
|
return ret; |
|
} |
|
} else if (!gov && genpd->state_count > 1) { |
|
pr_warn("%s: no governor for states\n", genpd->name); |
|
} |
|
|
|
device_initialize(&genpd->dev); |
|
dev_set_name(&genpd->dev, "%s", genpd->name); |
|
|
|
mutex_lock(&gpd_list_lock); |
|
list_add(&genpd->gpd_list_node, &gpd_list); |
|
genpd_debug_add(genpd); |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_init); |
|
|
|
static int genpd_remove(struct generic_pm_domain *genpd) |
|
{ |
|
struct gpd_link *l, *link; |
|
|
|
if (IS_ERR_OR_NULL(genpd)) |
|
return -EINVAL; |
|
|
|
genpd_lock(genpd); |
|
|
|
if (genpd->has_provider) { |
|
genpd_unlock(genpd); |
|
pr_err("Provider present, unable to remove %s\n", genpd->name); |
|
return -EBUSY; |
|
} |
|
|
|
if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
|
genpd_unlock(genpd); |
|
pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
|
return -EBUSY; |
|
} |
|
|
|
list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
|
list_del(&link->parent_node); |
|
list_del(&link->child_node); |
|
kfree(link); |
|
} |
|
|
|
genpd_debug_remove(genpd); |
|
list_del(&genpd->gpd_list_node); |
|
genpd_unlock(genpd); |
|
cancel_work_sync(&genpd->power_off_work); |
|
if (genpd_is_cpu_domain(genpd)) |
|
free_cpumask_var(genpd->cpus); |
|
if (genpd->free_states) |
|
genpd->free_states(genpd->states, genpd->state_count); |
|
|
|
pr_debug("%s: removed %s\n", __func__, genpd->name); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* pm_genpd_remove - Remove a generic I/O PM domain |
|
* @genpd: Pointer to PM domain that is to be removed. |
|
* |
|
* To remove the PM domain, this function: |
|
* - Removes the PM domain as a subdomain to any parent domains, |
|
* if it was added. |
|
* - Removes the PM domain from the list of registered PM domains. |
|
* |
|
* The PM domain will only be removed, if the associated provider has |
|
* been removed, it is not a parent to any other PM domain and has no |
|
* devices associated with it. |
|
*/ |
|
int pm_genpd_remove(struct generic_pm_domain *genpd) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
ret = genpd_remove(genpd); |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_remove); |
|
|
|
#ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
|
|
|
/* |
|
* Device Tree based PM domain providers. |
|
* |
|
* The code below implements generic device tree based PM domain providers that |
|
* bind device tree nodes with generic PM domains registered in the system. |
|
* |
|
* Any driver that registers generic PM domains and needs to support binding of |
|
* devices to these domains is supposed to register a PM domain provider, which |
|
* maps a PM domain specifier retrieved from the device tree to a PM domain. |
|
* |
|
* Two simple mapping functions have been provided for convenience: |
|
* - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
|
* - genpd_xlate_onecell() for mapping of multiple PM domains per node by |
|
* index. |
|
*/ |
|
|
|
/** |
|
* struct of_genpd_provider - PM domain provider registration structure |
|
* @link: Entry in global list of PM domain providers |
|
* @node: Pointer to device tree node of PM domain provider |
|
* @xlate: Provider-specific xlate callback mapping a set of specifier cells |
|
* into a PM domain. |
|
* @data: context pointer to be passed into @xlate callback |
|
*/ |
|
struct of_genpd_provider { |
|
struct list_head link; |
|
struct device_node *node; |
|
genpd_xlate_t xlate; |
|
void *data; |
|
}; |
|
|
|
/* List of registered PM domain providers. */ |
|
static LIST_HEAD(of_genpd_providers); |
|
/* Mutex to protect the list above. */ |
|
static DEFINE_MUTEX(of_genpd_mutex); |
|
|
|
/** |
|
* genpd_xlate_simple() - Xlate function for direct node-domain mapping |
|
* @genpdspec: OF phandle args to map into a PM domain |
|
* @data: xlate function private data - pointer to struct generic_pm_domain |
|
* |
|
* This is a generic xlate function that can be used to model PM domains that |
|
* have their own device tree nodes. The private data of xlate function needs |
|
* to be a valid pointer to struct generic_pm_domain. |
|
*/ |
|
static struct generic_pm_domain *genpd_xlate_simple( |
|
struct of_phandle_args *genpdspec, |
|
void *data) |
|
{ |
|
return data; |
|
} |
|
|
|
/** |
|
* genpd_xlate_onecell() - Xlate function using a single index. |
|
* @genpdspec: OF phandle args to map into a PM domain |
|
* @data: xlate function private data - pointer to struct genpd_onecell_data |
|
* |
|
* This is a generic xlate function that can be used to model simple PM domain |
|
* controllers that have one device tree node and provide multiple PM domains. |
|
* A single cell is used as an index into an array of PM domains specified in |
|
* the genpd_onecell_data struct when registering the provider. |
|
*/ |
|
static struct generic_pm_domain *genpd_xlate_onecell( |
|
struct of_phandle_args *genpdspec, |
|
void *data) |
|
{ |
|
struct genpd_onecell_data *genpd_data = data; |
|
unsigned int idx = genpdspec->args[0]; |
|
|
|
if (genpdspec->args_count != 1) |
|
return ERR_PTR(-EINVAL); |
|
|
|
if (idx >= genpd_data->num_domains) { |
|
pr_err("%s: invalid domain index %u\n", __func__, idx); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
if (!genpd_data->domains[idx]) |
|
return ERR_PTR(-ENOENT); |
|
|
|
return genpd_data->domains[idx]; |
|
} |
|
|
|
/** |
|
* genpd_add_provider() - Register a PM domain provider for a node |
|
* @np: Device node pointer associated with the PM domain provider. |
|
* @xlate: Callback for decoding PM domain from phandle arguments. |
|
* @data: Context pointer for @xlate callback. |
|
*/ |
|
static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
|
void *data) |
|
{ |
|
struct of_genpd_provider *cp; |
|
|
|
cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
|
if (!cp) |
|
return -ENOMEM; |
|
|
|
cp->node = of_node_get(np); |
|
cp->data = data; |
|
cp->xlate = xlate; |
|
fwnode_dev_initialized(&np->fwnode, true); |
|
|
|
mutex_lock(&of_genpd_mutex); |
|
list_add(&cp->link, &of_genpd_providers); |
|
mutex_unlock(&of_genpd_mutex); |
|
pr_debug("Added domain provider from %pOF\n", np); |
|
|
|
return 0; |
|
} |
|
|
|
static bool genpd_present(const struct generic_pm_domain *genpd) |
|
{ |
|
const struct generic_pm_domain *gpd; |
|
|
|
list_for_each_entry(gpd, &gpd_list, gpd_list_node) |
|
if (gpd == genpd) |
|
return true; |
|
return false; |
|
} |
|
|
|
/** |
|
* of_genpd_add_provider_simple() - Register a simple PM domain provider |
|
* @np: Device node pointer associated with the PM domain provider. |
|
* @genpd: Pointer to PM domain associated with the PM domain provider. |
|
*/ |
|
int of_genpd_add_provider_simple(struct device_node *np, |
|
struct generic_pm_domain *genpd) |
|
{ |
|
int ret = -EINVAL; |
|
|
|
if (!np || !genpd) |
|
return -EINVAL; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
if (!genpd_present(genpd)) |
|
goto unlock; |
|
|
|
genpd->dev.of_node = np; |
|
|
|
/* Parse genpd OPP table */ |
|
if (genpd->set_performance_state) { |
|
ret = dev_pm_opp_of_add_table(&genpd->dev); |
|
if (ret) { |
|
if (ret != -EPROBE_DEFER) |
|
dev_err(&genpd->dev, "Failed to add OPP table: %d\n", |
|
ret); |
|
goto unlock; |
|
} |
|
|
|
/* |
|
* Save table for faster processing while setting performance |
|
* state. |
|
*/ |
|
genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
|
WARN_ON(IS_ERR(genpd->opp_table)); |
|
} |
|
|
|
ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
|
if (ret) { |
|
if (genpd->set_performance_state) { |
|
dev_pm_opp_put_opp_table(genpd->opp_table); |
|
dev_pm_opp_of_remove_table(&genpd->dev); |
|
} |
|
|
|
goto unlock; |
|
} |
|
|
|
genpd->provider = &np->fwnode; |
|
genpd->has_provider = true; |
|
|
|
unlock: |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); |
|
|
|
/** |
|
* of_genpd_add_provider_onecell() - Register a onecell PM domain provider |
|
* @np: Device node pointer associated with the PM domain provider. |
|
* @data: Pointer to the data associated with the PM domain provider. |
|
*/ |
|
int of_genpd_add_provider_onecell(struct device_node *np, |
|
struct genpd_onecell_data *data) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
unsigned int i; |
|
int ret = -EINVAL; |
|
|
|
if (!np || !data) |
|
return -EINVAL; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
if (!data->xlate) |
|
data->xlate = genpd_xlate_onecell; |
|
|
|
for (i = 0; i < data->num_domains; i++) { |
|
genpd = data->domains[i]; |
|
|
|
if (!genpd) |
|
continue; |
|
if (!genpd_present(genpd)) |
|
goto error; |
|
|
|
genpd->dev.of_node = np; |
|
|
|
/* Parse genpd OPP table */ |
|
if (genpd->set_performance_state) { |
|
ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); |
|
if (ret) { |
|
if (ret != -EPROBE_DEFER) |
|
dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", |
|
i, ret); |
|
goto error; |
|
} |
|
|
|
/* |
|
* Save table for faster processing while setting |
|
* performance state. |
|
*/ |
|
genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
|
WARN_ON(IS_ERR(genpd->opp_table)); |
|
} |
|
|
|
genpd->provider = &np->fwnode; |
|
genpd->has_provider = true; |
|
} |
|
|
|
ret = genpd_add_provider(np, data->xlate, data); |
|
if (ret < 0) |
|
goto error; |
|
|
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return 0; |
|
|
|
error: |
|
while (i--) { |
|
genpd = data->domains[i]; |
|
|
|
if (!genpd) |
|
continue; |
|
|
|
genpd->provider = NULL; |
|
genpd->has_provider = false; |
|
|
|
if (genpd->set_performance_state) { |
|
dev_pm_opp_put_opp_table(genpd->opp_table); |
|
dev_pm_opp_of_remove_table(&genpd->dev); |
|
} |
|
} |
|
|
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); |
|
|
|
/** |
|
* of_genpd_del_provider() - Remove a previously registered PM domain provider |
|
* @np: Device node pointer associated with the PM domain provider |
|
*/ |
|
void of_genpd_del_provider(struct device_node *np) |
|
{ |
|
struct of_genpd_provider *cp, *tmp; |
|
struct generic_pm_domain *gpd; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
mutex_lock(&of_genpd_mutex); |
|
list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
|
if (cp->node == np) { |
|
/* |
|
* For each PM domain associated with the |
|
* provider, set the 'has_provider' to false |
|
* so that the PM domain can be safely removed. |
|
*/ |
|
list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
|
if (gpd->provider == &np->fwnode) { |
|
gpd->has_provider = false; |
|
|
|
if (!gpd->set_performance_state) |
|
continue; |
|
|
|
dev_pm_opp_put_opp_table(gpd->opp_table); |
|
dev_pm_opp_of_remove_table(&gpd->dev); |
|
} |
|
} |
|
|
|
fwnode_dev_initialized(&cp->node->fwnode, false); |
|
list_del(&cp->link); |
|
of_node_put(cp->node); |
|
kfree(cp); |
|
break; |
|
} |
|
} |
|
mutex_unlock(&of_genpd_mutex); |
|
mutex_unlock(&gpd_list_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_del_provider); |
|
|
|
/** |
|
* genpd_get_from_provider() - Look-up PM domain |
|
* @genpdspec: OF phandle args to use for look-up |
|
* |
|
* Looks for a PM domain provider under the node specified by @genpdspec and if |
|
* found, uses xlate function of the provider to map phandle args to a PM |
|
* domain. |
|
* |
|
* Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() |
|
* on failure. |
|
*/ |
|
static struct generic_pm_domain *genpd_get_from_provider( |
|
struct of_phandle_args *genpdspec) |
|
{ |
|
struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); |
|
struct of_genpd_provider *provider; |
|
|
|
if (!genpdspec) |
|
return ERR_PTR(-EINVAL); |
|
|
|
mutex_lock(&of_genpd_mutex); |
|
|
|
/* Check if we have such a provider in our array */ |
|
list_for_each_entry(provider, &of_genpd_providers, link) { |
|
if (provider->node == genpdspec->np) |
|
genpd = provider->xlate(genpdspec, provider->data); |
|
if (!IS_ERR(genpd)) |
|
break; |
|
} |
|
|
|
mutex_unlock(&of_genpd_mutex); |
|
|
|
return genpd; |
|
} |
|
|
|
/** |
|
* of_genpd_add_device() - Add a device to an I/O PM domain |
|
* @genpdspec: OF phandle args to use for look-up PM domain |
|
* @dev: Device to be added. |
|
* |
|
* Looks-up an I/O PM domain based upon phandle args provided and adds |
|
* the device to the PM domain. Returns a negative error code on failure. |
|
*/ |
|
int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
genpd = genpd_get_from_provider(genpdspec); |
|
if (IS_ERR(genpd)) { |
|
ret = PTR_ERR(genpd); |
|
goto out; |
|
} |
|
|
|
ret = genpd_add_device(genpd, dev, dev); |
|
|
|
out: |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_add_device); |
|
|
|
/** |
|
* of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
|
* @parent_spec: OF phandle args to use for parent PM domain look-up |
|
* @subdomain_spec: OF phandle args to use for subdomain look-up |
|
* |
|
* Looks-up a parent PM domain and subdomain based upon phandle args |
|
* provided and adds the subdomain to the parent PM domain. Returns a |
|
* negative error code on failure. |
|
*/ |
|
int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, |
|
struct of_phandle_args *subdomain_spec) |
|
{ |
|
struct generic_pm_domain *parent, *subdomain; |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
parent = genpd_get_from_provider(parent_spec); |
|
if (IS_ERR(parent)) { |
|
ret = PTR_ERR(parent); |
|
goto out; |
|
} |
|
|
|
subdomain = genpd_get_from_provider(subdomain_spec); |
|
if (IS_ERR(subdomain)) { |
|
ret = PTR_ERR(subdomain); |
|
goto out; |
|
} |
|
|
|
ret = genpd_add_subdomain(parent, subdomain); |
|
|
|
out: |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret == -ENOENT ? -EPROBE_DEFER : ret; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); |
|
|
|
/** |
|
* of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
|
* @parent_spec: OF phandle args to use for parent PM domain look-up |
|
* @subdomain_spec: OF phandle args to use for subdomain look-up |
|
* |
|
* Looks-up a parent PM domain and subdomain based upon phandle args |
|
* provided and removes the subdomain from the parent PM domain. Returns a |
|
* negative error code on failure. |
|
*/ |
|
int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, |
|
struct of_phandle_args *subdomain_spec) |
|
{ |
|
struct generic_pm_domain *parent, *subdomain; |
|
int ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
|
|
parent = genpd_get_from_provider(parent_spec); |
|
if (IS_ERR(parent)) { |
|
ret = PTR_ERR(parent); |
|
goto out; |
|
} |
|
|
|
subdomain = genpd_get_from_provider(subdomain_spec); |
|
if (IS_ERR(subdomain)) { |
|
ret = PTR_ERR(subdomain); |
|
goto out; |
|
} |
|
|
|
ret = pm_genpd_remove_subdomain(parent, subdomain); |
|
|
|
out: |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); |
|
|
|
/** |
|
* of_genpd_remove_last - Remove the last PM domain registered for a provider |
|
* @provider: Pointer to device structure associated with provider |
|
* |
|
* Find the last PM domain that was added by a particular provider and |
|
* remove this PM domain from the list of PM domains. The provider is |
|
* identified by the 'provider' device structure that is passed. The PM |
|
* domain will only be removed, if the provider associated with domain |
|
* has been removed. |
|
* |
|
* Returns a valid pointer to struct generic_pm_domain on success or |
|
* ERR_PTR() on failure. |
|
*/ |
|
struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) |
|
{ |
|
struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
|
int ret; |
|
|
|
if (IS_ERR_OR_NULL(np)) |
|
return ERR_PTR(-EINVAL); |
|
|
|
mutex_lock(&gpd_list_lock); |
|
list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
|
if (gpd->provider == &np->fwnode) { |
|
ret = genpd_remove(gpd); |
|
genpd = ret ? ERR_PTR(ret) : gpd; |
|
break; |
|
} |
|
} |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return genpd; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_remove_last); |
|
|
|
static void genpd_release_dev(struct device *dev) |
|
{ |
|
of_node_put(dev->of_node); |
|
kfree(dev); |
|
} |
|
|
|
static struct bus_type genpd_bus_type = { |
|
.name = "genpd", |
|
}; |
|
|
|
/** |
|
* genpd_dev_pm_detach - Detach a device from its PM domain. |
|
* @dev: Device to detach. |
|
* @power_off: Currently not used |
|
* |
|
* Try to locate a corresponding generic PM domain, which the device was |
|
* attached to previously. If such is found, the device is detached from it. |
|
*/ |
|
static void genpd_dev_pm_detach(struct device *dev, bool power_off) |
|
{ |
|
struct generic_pm_domain *pd; |
|
unsigned int i; |
|
int ret = 0; |
|
|
|
pd = dev_to_genpd(dev); |
|
if (IS_ERR(pd)) |
|
return; |
|
|
|
dev_dbg(dev, "removing from PM domain %s\n", pd->name); |
|
|
|
for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
|
ret = genpd_remove_device(pd, dev); |
|
if (ret != -EAGAIN) |
|
break; |
|
|
|
mdelay(i); |
|
cond_resched(); |
|
} |
|
|
|
if (ret < 0) { |
|
dev_err(dev, "failed to remove from PM domain %s: %d", |
|
pd->name, ret); |
|
return; |
|
} |
|
|
|
/* Check if PM domain can be powered off after removing this device. */ |
|
genpd_queue_power_off_work(pd); |
|
|
|
/* Unregister the device if it was created by genpd. */ |
|
if (dev->bus == &genpd_bus_type) |
|
device_unregister(dev); |
|
} |
|
|
|
static void genpd_dev_pm_sync(struct device *dev) |
|
{ |
|
struct generic_pm_domain *pd; |
|
|
|
pd = dev_to_genpd(dev); |
|
if (IS_ERR(pd)) |
|
return; |
|
|
|
genpd_queue_power_off_work(pd); |
|
} |
|
|
|
static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
|
unsigned int index, bool power_on) |
|
{ |
|
struct of_phandle_args pd_args; |
|
struct generic_pm_domain *pd; |
|
int ret; |
|
|
|
ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
|
"#power-domain-cells", index, &pd_args); |
|
if (ret < 0) |
|
return ret; |
|
|
|
mutex_lock(&gpd_list_lock); |
|
pd = genpd_get_from_provider(&pd_args); |
|
of_node_put(pd_args.np); |
|
if (IS_ERR(pd)) { |
|
mutex_unlock(&gpd_list_lock); |
|
dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
|
__func__, PTR_ERR(pd)); |
|
return driver_deferred_probe_check_state(base_dev); |
|
} |
|
|
|
dev_dbg(dev, "adding to PM domain %s\n", pd->name); |
|
|
|
ret = genpd_add_device(pd, dev, base_dev); |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
if (ret < 0) { |
|
if (ret != -EPROBE_DEFER) |
|
dev_err(dev, "failed to add to PM domain %s: %d", |
|
pd->name, ret); |
|
return ret; |
|
} |
|
|
|
dev->pm_domain->detach = genpd_dev_pm_detach; |
|
dev->pm_domain->sync = genpd_dev_pm_sync; |
|
|
|
if (power_on) { |
|
genpd_lock(pd); |
|
ret = genpd_power_on(pd, 0); |
|
genpd_unlock(pd); |
|
} |
|
|
|
if (ret) |
|
genpd_remove_device(pd, dev); |
|
|
|
return ret ? -EPROBE_DEFER : 1; |
|
} |
|
|
|
/** |
|
* genpd_dev_pm_attach - Attach a device to its PM domain using DT. |
|
* @dev: Device to attach. |
|
* |
|
* Parse device's OF node to find a PM domain specifier. If such is found, |
|
* attaches the device to retrieved pm_domain ops. |
|
* |
|
* Returns 1 on successfully attached PM domain, 0 when the device don't need a |
|
* PM domain or when multiple power-domains exists for it, else a negative error |
|
* code. Note that if a power-domain exists for the device, but it cannot be |
|
* found or turned on, then return -EPROBE_DEFER to ensure that the device is |
|
* not probed and to re-try again later. |
|
*/ |
|
int genpd_dev_pm_attach(struct device *dev) |
|
{ |
|
if (!dev->of_node) |
|
return 0; |
|
|
|
/* |
|
* Devices with multiple PM domains must be attached separately, as we |
|
* can only attach one PM domain per device. |
|
*/ |
|
if (of_count_phandle_with_args(dev->of_node, "power-domains", |
|
"#power-domain-cells") != 1) |
|
return 0; |
|
|
|
return __genpd_dev_pm_attach(dev, dev, 0, true); |
|
} |
|
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
|
|
|
/** |
|
* genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. |
|
* @dev: The device used to lookup the PM domain. |
|
* @index: The index of the PM domain. |
|
* |
|
* Parse device's OF node to find a PM domain specifier at the provided @index. |
|
* If such is found, creates a virtual device and attaches it to the retrieved |
|
* pm_domain ops. To deal with detaching of the virtual device, the ->detach() |
|
* callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). |
|
* |
|
* Returns the created virtual device if successfully attached PM domain, NULL |
|
* when the device don't need a PM domain, else an ERR_PTR() in case of |
|
* failures. If a power-domain exists for the device, but cannot be found or |
|
* turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device |
|
* is not probed and to re-try again later. |
|
*/ |
|
struct device *genpd_dev_pm_attach_by_id(struct device *dev, |
|
unsigned int index) |
|
{ |
|
struct device *virt_dev; |
|
int num_domains; |
|
int ret; |
|
|
|
if (!dev->of_node) |
|
return NULL; |
|
|
|
/* Verify that the index is within a valid range. */ |
|
num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
|
"#power-domain-cells"); |
|
if (index >= num_domains) |
|
return NULL; |
|
|
|
/* Allocate and register device on the genpd bus. */ |
|
virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
|
if (!virt_dev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
|
virt_dev->bus = &genpd_bus_type; |
|
virt_dev->release = genpd_release_dev; |
|
virt_dev->of_node = of_node_get(dev->of_node); |
|
|
|
ret = device_register(virt_dev); |
|
if (ret) { |
|
put_device(virt_dev); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
/* Try to attach the device to the PM domain at the specified index. */ |
|
ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
|
if (ret < 1) { |
|
device_unregister(virt_dev); |
|
return ret ? ERR_PTR(ret) : NULL; |
|
} |
|
|
|
pm_runtime_enable(virt_dev); |
|
genpd_queue_power_off_work(dev_to_genpd(virt_dev)); |
|
|
|
return virt_dev; |
|
} |
|
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); |
|
|
|
/** |
|
* genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. |
|
* @dev: The device used to lookup the PM domain. |
|
* @name: The name of the PM domain. |
|
* |
|
* Parse device's OF node to find a PM domain specifier using the |
|
* power-domain-names DT property. For further description see |
|
* genpd_dev_pm_attach_by_id(). |
|
*/ |
|
struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
|
{ |
|
int index; |
|
|
|
if (!dev->of_node) |
|
return NULL; |
|
|
|
index = of_property_match_string(dev->of_node, "power-domain-names", |
|
name); |
|
if (index < 0) |
|
return NULL; |
|
|
|
return genpd_dev_pm_attach_by_id(dev, index); |
|
} |
|
|
|
static const struct of_device_id idle_state_match[] = { |
|
{ .compatible = "domain-idle-state", }, |
|
{ } |
|
}; |
|
|
|
static int genpd_parse_state(struct genpd_power_state *genpd_state, |
|
struct device_node *state_node) |
|
{ |
|
int err; |
|
u32 residency; |
|
u32 entry_latency, exit_latency; |
|
|
|
err = of_property_read_u32(state_node, "entry-latency-us", |
|
&entry_latency); |
|
if (err) { |
|
pr_debug(" * %pOF missing entry-latency-us property\n", |
|
state_node); |
|
return -EINVAL; |
|
} |
|
|
|
err = of_property_read_u32(state_node, "exit-latency-us", |
|
&exit_latency); |
|
if (err) { |
|
pr_debug(" * %pOF missing exit-latency-us property\n", |
|
state_node); |
|
return -EINVAL; |
|
} |
|
|
|
err = of_property_read_u32(state_node, "min-residency-us", &residency); |
|
if (!err) |
|
genpd_state->residency_ns = 1000 * residency; |
|
|
|
genpd_state->power_on_latency_ns = 1000 * exit_latency; |
|
genpd_state->power_off_latency_ns = 1000 * entry_latency; |
|
genpd_state->fwnode = &state_node->fwnode; |
|
|
|
return 0; |
|
} |
|
|
|
static int genpd_iterate_idle_states(struct device_node *dn, |
|
struct genpd_power_state *states) |
|
{ |
|
int ret; |
|
struct of_phandle_iterator it; |
|
struct device_node *np; |
|
int i = 0; |
|
|
|
ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); |
|
if (ret <= 0) |
|
return ret == -ENOENT ? 0 : ret; |
|
|
|
/* Loop over the phandles until all the requested entry is found */ |
|
of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { |
|
np = it.node; |
|
if (!of_match_node(idle_state_match, np)) |
|
continue; |
|
if (states) { |
|
ret = genpd_parse_state(&states[i], np); |
|
if (ret) { |
|
pr_err("Parsing idle state node %pOF failed with err %d\n", |
|
np, ret); |
|
of_node_put(np); |
|
return ret; |
|
} |
|
} |
|
i++; |
|
} |
|
|
|
return i; |
|
} |
|
|
|
/** |
|
* of_genpd_parse_idle_states: Return array of idle states for the genpd. |
|
* |
|
* @dn: The genpd device node |
|
* @states: The pointer to which the state array will be saved. |
|
* @n: The count of elements in the array returned from this function. |
|
* |
|
* Returns the device states parsed from the OF node. The memory for the states |
|
* is allocated by this function and is the responsibility of the caller to |
|
* free the memory after use. If any or zero compatible domain idle states is |
|
* found it returns 0 and in case of errors, a negative error code is returned. |
|
*/ |
|
int of_genpd_parse_idle_states(struct device_node *dn, |
|
struct genpd_power_state **states, int *n) |
|
{ |
|
struct genpd_power_state *st; |
|
int ret; |
|
|
|
ret = genpd_iterate_idle_states(dn, NULL); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (!ret) { |
|
*states = NULL; |
|
*n = 0; |
|
return 0; |
|
} |
|
|
|
st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
|
if (!st) |
|
return -ENOMEM; |
|
|
|
ret = genpd_iterate_idle_states(dn, st); |
|
if (ret <= 0) { |
|
kfree(st); |
|
return ret < 0 ? ret : -EINVAL; |
|
} |
|
|
|
*states = st; |
|
*n = ret; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); |
|
|
|
/** |
|
* pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. |
|
* |
|
* @genpd_dev: Genpd's device for which the performance-state needs to be found. |
|
* @opp: struct dev_pm_opp of the OPP for which we need to find performance |
|
* state. |
|
* |
|
* Returns performance state encoded in the OPP of the genpd. This calls |
|
* platform specific genpd->opp_to_performance_state() callback to translate |
|
* power domain OPP to performance state. |
|
* |
|
* Returns performance state on success and 0 on failure. |
|
*/ |
|
unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, |
|
struct dev_pm_opp *opp) |
|
{ |
|
struct generic_pm_domain *genpd = NULL; |
|
int state; |
|
|
|
genpd = container_of(genpd_dev, struct generic_pm_domain, dev); |
|
|
|
if (unlikely(!genpd->opp_to_performance_state)) |
|
return 0; |
|
|
|
genpd_lock(genpd); |
|
state = genpd->opp_to_performance_state(genpd, opp); |
|
genpd_unlock(genpd); |
|
|
|
return state; |
|
} |
|
EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); |
|
|
|
static int __init genpd_bus_init(void) |
|
{ |
|
return bus_register(&genpd_bus_type); |
|
} |
|
core_initcall(genpd_bus_init); |
|
|
|
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
|
|
|
|
|
/*** debugfs support ***/ |
|
|
|
#ifdef CONFIG_DEBUG_FS |
|
/* |
|
* TODO: This function is a slightly modified version of rtpm_status_show |
|
* from sysfs.c, so generalize it. |
|
*/ |
|
static void rtpm_status_str(struct seq_file *s, struct device *dev) |
|
{ |
|
static const char * const status_lookup[] = { |
|
[RPM_ACTIVE] = "active", |
|
[RPM_RESUMING] = "resuming", |
|
[RPM_SUSPENDED] = "suspended", |
|
[RPM_SUSPENDING] = "suspending" |
|
}; |
|
const char *p = ""; |
|
|
|
if (dev->power.runtime_error) |
|
p = "error"; |
|
else if (dev->power.disable_depth) |
|
p = "unsupported"; |
|
else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) |
|
p = status_lookup[dev->power.runtime_status]; |
|
else |
|
WARN_ON(1); |
|
|
|
seq_printf(s, "%-25s ", p); |
|
} |
|
|
|
static void perf_status_str(struct seq_file *s, struct device *dev) |
|
{ |
|
struct generic_pm_domain_data *gpd_data; |
|
|
|
gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
|
seq_put_decimal_ull(s, "", gpd_data->performance_state); |
|
} |
|
|
|
static int genpd_summary_one(struct seq_file *s, |
|
struct generic_pm_domain *genpd) |
|
{ |
|
static const char * const status_lookup[] = { |
|
[GENPD_STATE_ON] = "on", |
|
[GENPD_STATE_OFF] = "off" |
|
}; |
|
struct pm_domain_data *pm_data; |
|
const char *kobj_path; |
|
struct gpd_link *link; |
|
char state[16]; |
|
int ret; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
|
goto exit; |
|
if (!genpd_status_on(genpd)) |
|
snprintf(state, sizeof(state), "%s-%u", |
|
status_lookup[genpd->status], genpd->state_idx); |
|
else |
|
snprintf(state, sizeof(state), "%s", |
|
status_lookup[genpd->status]); |
|
seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state); |
|
|
|
/* |
|
* Modifications on the list require holding locks on both |
|
* parent and child, so we are safe. |
|
* Also genpd->name is immutable. |
|
*/ |
|
list_for_each_entry(link, &genpd->parent_links, parent_node) { |
|
if (list_is_first(&link->parent_node, &genpd->parent_links)) |
|
seq_printf(s, "\n%48s", " "); |
|
seq_printf(s, "%s", link->child->name); |
|
if (!list_is_last(&link->parent_node, &genpd->parent_links)) |
|
seq_puts(s, ", "); |
|
} |
|
|
|
list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
|
kobj_path = kobject_get_path(&pm_data->dev->kobj, |
|
genpd_is_irq_safe(genpd) ? |
|
GFP_ATOMIC : GFP_KERNEL); |
|
if (kobj_path == NULL) |
|
continue; |
|
|
|
seq_printf(s, "\n %-50s ", kobj_path); |
|
rtpm_status_str(s, pm_data->dev); |
|
perf_status_str(s, pm_data->dev); |
|
kfree(kobj_path); |
|
} |
|
|
|
seq_puts(s, "\n"); |
|
exit: |
|
genpd_unlock(genpd); |
|
|
|
return 0; |
|
} |
|
|
|
static int summary_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
int ret = 0; |
|
|
|
seq_puts(s, "domain status children performance\n"); |
|
seq_puts(s, " /device runtime status\n"); |
|
seq_puts(s, "----------------------------------------------------------------------------------------------\n"); |
|
|
|
ret = mutex_lock_interruptible(&gpd_list_lock); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
|
ret = genpd_summary_one(s, genpd); |
|
if (ret) |
|
break; |
|
} |
|
mutex_unlock(&gpd_list_lock); |
|
|
|
return ret; |
|
} |
|
|
|
static int status_show(struct seq_file *s, void *data) |
|
{ |
|
static const char * const status_lookup[] = { |
|
[GENPD_STATE_ON] = "on", |
|
[GENPD_STATE_OFF] = "off" |
|
}; |
|
|
|
struct generic_pm_domain *genpd = s->private; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) |
|
goto exit; |
|
|
|
if (genpd->status == GENPD_STATE_OFF) |
|
seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
|
genpd->state_idx); |
|
else |
|
seq_printf(s, "%s\n", status_lookup[genpd->status]); |
|
exit: |
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
static int sub_domains_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
struct gpd_link *link; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
list_for_each_entry(link, &genpd->parent_links, parent_node) |
|
seq_printf(s, "%s\n", link->child->name); |
|
|
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
static int idle_states_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
unsigned int i; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
|
|
|
for (i = 0; i < genpd->state_count; i++) { |
|
ktime_t delta = 0; |
|
s64 msecs; |
|
|
|
if ((genpd->status == GENPD_STATE_OFF) && |
|
(genpd->state_idx == i)) |
|
delta = ktime_sub(ktime_get(), genpd->accounting_time); |
|
|
|
msecs = ktime_to_ms( |
|
ktime_add(genpd->states[i].idle_time, delta)); |
|
seq_printf(s, "S%-13i %-14lld %-14llu %llu\n", i, msecs, |
|
genpd->states[i].usage, genpd->states[i].rejected); |
|
} |
|
|
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
static int active_time_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
ktime_t delta = 0; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
if (genpd->status == GENPD_STATE_ON) |
|
delta = ktime_sub(ktime_get(), genpd->accounting_time); |
|
|
|
seq_printf(s, "%lld ms\n", ktime_to_ms( |
|
ktime_add(genpd->on_time, delta))); |
|
|
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
static int total_idle_time_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
ktime_t delta = 0, total = 0; |
|
unsigned int i; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
for (i = 0; i < genpd->state_count; i++) { |
|
|
|
if ((genpd->status == GENPD_STATE_OFF) && |
|
(genpd->state_idx == i)) |
|
delta = ktime_sub(ktime_get(), genpd->accounting_time); |
|
|
|
total = ktime_add(total, genpd->states[i].idle_time); |
|
} |
|
total = ktime_add(total, delta); |
|
|
|
seq_printf(s, "%lld ms\n", ktime_to_ms(total)); |
|
|
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
|
|
static int devices_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
struct pm_domain_data *pm_data; |
|
const char *kobj_path; |
|
int ret = 0; |
|
|
|
ret = genpd_lock_interruptible(genpd); |
|
if (ret) |
|
return -ERESTARTSYS; |
|
|
|
list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
|
kobj_path = kobject_get_path(&pm_data->dev->kobj, |
|
genpd_is_irq_safe(genpd) ? |
|
GFP_ATOMIC : GFP_KERNEL); |
|
if (kobj_path == NULL) |
|
continue; |
|
|
|
seq_printf(s, "%s\n", kobj_path); |
|
kfree(kobj_path); |
|
} |
|
|
|
genpd_unlock(genpd); |
|
return ret; |
|
} |
|
|
|
static int perf_state_show(struct seq_file *s, void *data) |
|
{ |
|
struct generic_pm_domain *genpd = s->private; |
|
|
|
if (genpd_lock_interruptible(genpd)) |
|
return -ERESTARTSYS; |
|
|
|
seq_printf(s, "%u\n", genpd->performance_state); |
|
|
|
genpd_unlock(genpd); |
|
return 0; |
|
} |
|
|
|
DEFINE_SHOW_ATTRIBUTE(summary); |
|
DEFINE_SHOW_ATTRIBUTE(status); |
|
DEFINE_SHOW_ATTRIBUTE(sub_domains); |
|
DEFINE_SHOW_ATTRIBUTE(idle_states); |
|
DEFINE_SHOW_ATTRIBUTE(active_time); |
|
DEFINE_SHOW_ATTRIBUTE(total_idle_time); |
|
DEFINE_SHOW_ATTRIBUTE(devices); |
|
DEFINE_SHOW_ATTRIBUTE(perf_state); |
|
|
|
static void genpd_debug_add(struct generic_pm_domain *genpd) |
|
{ |
|
struct dentry *d; |
|
|
|
if (!genpd_debugfs_dir) |
|
return; |
|
|
|
d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
|
|
|
debugfs_create_file("current_state", 0444, |
|
d, genpd, &status_fops); |
|
debugfs_create_file("sub_domains", 0444, |
|
d, genpd, &sub_domains_fops); |
|
debugfs_create_file("idle_states", 0444, |
|
d, genpd, &idle_states_fops); |
|
debugfs_create_file("active_time", 0444, |
|
d, genpd, &active_time_fops); |
|
debugfs_create_file("total_idle_time", 0444, |
|
d, genpd, &total_idle_time_fops); |
|
debugfs_create_file("devices", 0444, |
|
d, genpd, &devices_fops); |
|
if (genpd->set_performance_state) |
|
debugfs_create_file("perf_state", 0444, |
|
d, genpd, &perf_state_fops); |
|
} |
|
|
|
static int __init genpd_debug_init(void) |
|
{ |
|
struct generic_pm_domain *genpd; |
|
|
|
genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
|
|
|
debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
|
NULL, &summary_fops); |
|
|
|
list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
|
genpd_debug_add(genpd); |
|
|
|
return 0; |
|
} |
|
late_initcall(genpd_debug_init); |
|
|
|
static void __exit genpd_debug_exit(void) |
|
{ |
|
debugfs_remove_recursive(genpd_debugfs_dir); |
|
} |
|
__exitcall(genpd_debug_exit); |
|
#endif /* CONFIG_DEBUG_FS */
|
|
|