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56cb26891e
Commit2c36168480("PM / Domains: Don't treat zero found compatible idle states as an error"), moved of_genpd_parse_idle_states() towards allowing none compatible idle state to be found for the device node, rather than returning an error code. However, it didn't consider that the "domain-idle-states" DT property may be missing as it's optional, which makes of_count_phandle_with_args() to return -ENOENT. Let's fix this to make the behaviour consistent. Fixes:2c36168480("PM / Domains: Don't treat zero found compatible idle states as an error") Reported-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: 4.20+ <stable@vger.kernel.org> # 4.20+ Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
3090 lines
77 KiB
C
3090 lines
77 KiB
C
// 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 <rjw@sisk.pl>, Renesas Electronics Corp.
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*/
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#define pr_fmt(fmt) "PM: " fmt
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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 "power.h"
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#define GENPD_RETRY_MAX_MS 250 /* Approximate */
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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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static LIST_HEAD(gpd_list);
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static DEFINE_MUTEX(gpd_list_lock);
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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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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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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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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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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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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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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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spin_lock_irqsave(&genpd->slock, flags);
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genpd->lock_flags = flags;
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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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spin_lock_irqsave_nested(&genpd->slock, flags, depth);
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genpd->lock_flags = flags;
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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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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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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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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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#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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#define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE)
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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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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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ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
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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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return ret;
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}
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static int genpd_runtime_suspend(struct device *dev);
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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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/* 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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return NULL;
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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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return pd_to_genpd(dev->pm_domain);
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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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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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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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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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return ret;
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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 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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now = ktime_get();
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delta = ktime_sub(now, genpd->accounting_time);
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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 == GPD_STATE_ACTIVE) {
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int state_idx = genpd->state_idx;
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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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genpd->accounting_time = now;
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}
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#else
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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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/* 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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/* 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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/* 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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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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* 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 master 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 master domain) is different from
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* link->slave->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->master_links, master_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_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 *master;
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struct gpd_link *link;
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int master_state, ret;
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if (state == genpd->performance_state)
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return 0;
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/* Propagate to masters of genpd */
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list_for_each_entry(link, &genpd->slave_links, slave_node) {
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master = link->master;
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if (!master->set_performance_state)
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continue;
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/* Find master's performance state */
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ret = dev_pm_opp_xlate_performance_state(genpd->opp_table,
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master->opp_table,
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state);
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if (unlikely(ret < 0))
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goto err;
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master_state = ret;
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genpd_lock_nested(master, depth + 1);
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link->prev_performance_state = link->performance_state;
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link->performance_state = master_state;
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master_state = _genpd_reeval_performance_state(master,
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master_state);
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ret = _genpd_set_performance_state(master, master_state, depth + 1);
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if (ret)
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link->performance_state = link->prev_performance_state;
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genpd_unlock(master);
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if (ret)
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goto err;
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}
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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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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->slave_links,
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slave_node) {
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master = link->master;
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if (!master->set_performance_state)
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continue;
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genpd_lock_nested(master, depth + 1);
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master_state = link->prev_performance_state;
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link->performance_state = master_state;
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master_state = _genpd_reeval_performance_state(master,
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master_state);
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if (_genpd_set_performance_state(master, master_state, depth + 1)) {
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pr_err("%s: Failed to roll back to %d performance state\n",
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master->name, master_state);
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}
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genpd_unlock(master);
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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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*/
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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 (unlikely(!genpd->set_performance_state))
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return -EINVAL;
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if (WARN_ON(!dev->power.subsys_data ||
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!dev->power.subsys_data->domain_data))
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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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}
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EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
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static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
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{
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unsigned int state_idx = genpd->state_idx;
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ktime_t time_start;
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s64 elapsed_ns;
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int ret;
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if (!genpd->power_on)
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return 0;
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if (!timed)
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return genpd->power_on(genpd);
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time_start = ktime_get();
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ret = genpd->power_on(genpd);
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if (ret)
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return ret;
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elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
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if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
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return ret;
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genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
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genpd->max_off_time_changed = true;
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pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
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genpd->name, "on", elapsed_ns);
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return ret;
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}
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static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
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{
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unsigned int state_idx = genpd->state_idx;
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ktime_t time_start;
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s64 elapsed_ns;
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int ret;
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if (!genpd->power_off)
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return 0;
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if (!timed)
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return genpd->power_off(genpd);
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time_start = ktime_get();
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ret = genpd->power_off(genpd);
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if (ret)
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return ret;
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elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
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if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
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return 0;
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genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
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genpd->max_off_time_changed = true;
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pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
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genpd->name, "off", elapsed_ns);
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return 0;
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}
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/**
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* genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
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* @genpd: PM domain to power off.
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*
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* Queue up the execution of genpd_power_off() unless it's already been done
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* before.
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*/
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static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
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{
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queue_work(pm_wq, &genpd->power_off_work);
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}
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/**
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* genpd_power_off - Remove power from a given PM domain.
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* @genpd: PM domain to power down.
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* @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
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* RPM status of the releated device is in an intermediate state, not yet turned
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* into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
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* be RPM_SUSPENDED, while it tries to power off the PM domain.
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*
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* If all of the @genpd's devices have been suspended and all of its subdomains
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* have been powered down, remove power from @genpd.
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*/
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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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (genpd->power_off) {
|
|
int ret;
|
|
|
|
if (atomic_read(&genpd->sd_count) > 0)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* If sd_count > 0 at this point, one of the subdomains hasn't
|
|
* managed to call genpd_power_on() for the master yet after
|
|
* incrementing it. In that case genpd_power_on() will wait
|
|
* for us to drop the lock, so we can call .power_off() and let
|
|
* the genpd_power_on() restore power for us (this shouldn't
|
|
* happen very often).
|
|
*/
|
|
ret = _genpd_power_off(genpd, true);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
genpd->status = GPD_STATE_POWER_OFF;
|
|
genpd_update_accounting(genpd);
|
|
|
|
list_for_each_entry(link, &genpd->slave_links, slave_node) {
|
|
genpd_sd_counter_dec(link->master);
|
|
genpd_lock_nested(link->master, depth + 1);
|
|
genpd_power_off(link->master, false, depth + 1);
|
|
genpd_unlock(link->master);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* genpd_power_on - Restore power to a given PM domain and its masters.
|
|
* @genpd: PM domain to power up.
|
|
* @depth: nesting count for lockdep.
|
|
*
|
|
* Restore power to @genpd and all of its masters 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 masters' .power_on() callbacks fiddles
|
|
* with it.
|
|
*/
|
|
list_for_each_entry(link, &genpd->slave_links, slave_node) {
|
|
struct generic_pm_domain *master = link->master;
|
|
|
|
genpd_sd_counter_inc(master);
|
|
|
|
genpd_lock_nested(master, depth + 1);
|
|
ret = genpd_power_on(master, depth + 1);
|
|
genpd_unlock(master);
|
|
|
|
if (ret) {
|
|
genpd_sd_counter_dec(master);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ret = _genpd_power_on(genpd, true);
|
|
if (ret)
|
|
goto err;
|
|
|
|
genpd->status = GPD_STATE_ACTIVE;
|
|
genpd_update_accounting(genpd);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
list_for_each_entry_continue_reverse(link,
|
|
&genpd->slave_links,
|
|
slave_node) {
|
|
genpd_sd_counter_dec(link->master);
|
|
genpd_lock_nested(link->master, depth + 1);
|
|
genpd_power_off(link->master, false, depth + 1);
|
|
genpd_unlock(link->master);
|
|
}
|
|
|
|
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) ||
|
|
(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 masters.
|
|
* @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 masters.
|
|
*
|
|
* 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 = GPD_STATE_POWER_OFF;
|
|
|
|
list_for_each_entry(link, &genpd->slave_links, slave_node) {
|
|
genpd_sd_counter_dec(link->master);
|
|
|
|
if (use_lock)
|
|
genpd_lock_nested(link->master, depth + 1);
|
|
|
|
genpd_sync_power_off(link->master, use_lock, depth + 1);
|
|
|
|
if (use_lock)
|
|
genpd_unlock(link->master);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* genpd_sync_power_on - Synchronously power on a PM domain and its masters.
|
|
* @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->slave_links, slave_node) {
|
|
genpd_sd_counter_inc(link->master);
|
|
|
|
if (use_lock)
|
|
genpd_lock_nested(link->master, depth + 1);
|
|
|
|
genpd_sync_power_on(link->master, use_lock, depth + 1);
|
|
|
|
if (use_lock)
|
|
genpd_unlock(link->master);
|
|
}
|
|
|
|
_genpd_power_on(genpd, false);
|
|
|
|
genpd->status = GPD_STATE_ACTIVE;
|
|
}
|
|
|
|
/**
|
|
* 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 (dev->power.wakeup_path && 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 (dev->power.wakeup_path && 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 = GPD_STATE_POWER_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);
|
|
}
|
|
|
|
/**
|
|
* genpd_syscore_switch - Switch power during system core suspend or resume.
|
|
* @dev: Device that normally is marked as "always on" to switch power for.
|
|
*
|
|
* This routine may only be called during the system core (syscore) suspend or
|
|
* resume phase for devices whose "always on" flags are set.
|
|
*/
|
|
static void genpd_syscore_switch(struct device *dev, bool suspend)
|
|
{
|
|
struct generic_pm_domain *genpd;
|
|
|
|
genpd = dev_to_genpd_safe(dev);
|
|
if (!genpd)
|
|
return;
|
|
|
|
if (suspend) {
|
|
genpd->suspended_count++;
|
|
genpd_sync_power_off(genpd, false, 0);
|
|
} else {
|
|
genpd_sync_power_on(genpd, false, 0);
|
|
genpd->suspended_count--;
|
|
}
|
|
}
|
|
|
|
void pm_genpd_syscore_poweroff(struct device *dev)
|
|
{
|
|
genpd_syscore_switch(dev, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
|
|
|
|
void pm_genpd_syscore_poweron(struct device *dev)
|
|
{
|
|
genpd_syscore_switch(dev, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
|
|
|
|
#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;
|
|
|
|
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->slave_links, slave_node) {
|
|
struct generic_pm_domain *master = link->master;
|
|
|
|
genpd_lock_nested(master, depth + 1);
|
|
genpd_update_cpumask(master, cpu, set, depth + 1);
|
|
genpd_unlock(master);
|
|
}
|
|
|
|
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);
|
|
|
|
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->master_links, master_node) {
|
|
if (itr->slave == subdomain && itr->master == genpd) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
link->master = genpd;
|
|
list_add_tail(&link->master_node, &genpd->master_links);
|
|
link->slave = subdomain;
|
|
list_add_tail(&link->slave_node, &subdomain->slave_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: Master 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: Master 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->master_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->master_links, master_node) {
|
|
if (link->slave != subdomain)
|
|
continue;
|
|
|
|
list_del(&link->master_node);
|
|
list_del(&link->slave_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->master_links);
|
|
INIT_LIST_HEAD(&genpd->slave_links);
|
|
INIT_LIST_HEAD(&genpd->dev_list);
|
|
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 ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
|
|
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);
|
|
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->master_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->slave_links, slave_node) {
|
|
list_del(&link->master_node);
|
|
list_del(&link->slave_node);
|
|
kfree(link);
|
|
}
|
|
|
|
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;
|
|
|
|
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) {
|
|
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(!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) {
|
|
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_indexed(&genpd->dev, i);
|
|
WARN_ON(!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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
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
|
|
#include <linux/pm.h>
|
|
#include <linux/device.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kobject.h>
|
|
static struct dentry *genpd_debugfs_dir;
|
|
|
|
/*
|
|
* 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_puts(s, p);
|
|
}
|
|
|
|
static int genpd_summary_one(struct seq_file *s,
|
|
struct generic_pm_domain *genpd)
|
|
{
|
|
static const char * const status_lookup[] = {
|
|
[GPD_STATE_ACTIVE] = "on",
|
|
[GPD_STATE_POWER_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 %-15s ", genpd->name, state);
|
|
|
|
/*
|
|
* Modifications on the list require holding locks on both
|
|
* master and slave, so we are safe.
|
|
* Also genpd->name is immutable.
|
|
*/
|
|
list_for_each_entry(link, &genpd->master_links, master_node) {
|
|
seq_printf(s, "%s", link->slave->name);
|
|
if (!list_is_last(&link->master_node, &genpd->master_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);
|
|
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 slaves\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[] = {
|
|
[GPD_STATE_ACTIVE] = "on",
|
|
[GPD_STATE_POWER_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 == GPD_STATE_POWER_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->master_links, master_node)
|
|
seq_printf(s, "%s\n", link->slave->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)\n");
|
|
|
|
for (i = 0; i < genpd->state_count; i++) {
|
|
ktime_t delta = 0;
|
|
s64 msecs;
|
|
|
|
if ((genpd->status == GPD_STATE_POWER_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 %lld\n", i, msecs);
|
|
}
|
|
|
|
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 == GPD_STATE_ACTIVE)
|
|
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 == GPD_STATE_POWER_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 int __init genpd_debug_init(void)
|
|
{
|
|
struct dentry *d;
|
|
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) {
|
|
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);
|
|
}
|
|
|
|
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 */
|