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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
- Add EPP support to the AMD P-state cpufreq driver (Perry Yuan, Wyes Karny, Arnd Bergmann, Bagas Sanjaya). - Drop the custom cpufreq driver for loongson1 that is not necessary any more and the corresponding cpufreq platform device (Keguang Zhang). - Remove "select SRCU" from system sleep, cpufreq and OPP Kconfig entries (Paul E. McKenney). - Enable thermal cooling for Tegra194 (Yi-Wei Wang). - Register module device table and add missing compatibles for cpufreq-qcom-hw (Nícolas F. R. A. Prado, Abel Vesa and Luca Weiss). - Various dt binding updates for qcom-cpufreq-nvmem and opp-v2-kryo-cpu (Christian Marangi). - Make kobj_type structure in the cpufreq core constant (Thomas Weißschuh). - Make cpufreq_unregister_driver() return void (Uwe Kleine-König). - Make the TEO cpuidle governor check CPU utilization in order to refine idle state selection (Kajetan Puchalski). - Make Kconfig select the haltpoll cpuidle governor when the haltpoll cpuidle driver is selected and replace a default_idle() call in that driver with arch_cpu_idle() to allow MWAIT to be used (Li RongQing). - Add Emerald Rapids Xeon support to the intel_idle driver (Artem Bityutskiy). - Add ARCH_SUSPEND_POSSIBLE dependencies for ARMv4 cpuidle drivers to avoid randconfig build failures (Arnd Bergmann). - Make kobj_type structures used in the cpuidle sysfs interface constant (Thomas Weißschuh). - Make the cpuidle driver registration code update microsecond values of idle state parameters in accordance with their nanosecond values if they are provided (Rafael Wysocki). - Make the PSCI cpuidle driver prevent topology CPUs from being suspended on PREEMPT_RT (Krzysztof Kozlowski). - Document that pm_runtime_force_suspend() cannot be used with DPM_FLAG_SMART_SUSPEND (Richard Fitzgerald). - Add EXPORT macros for exporting PM functions from drivers (Richard Fitzgerald). - Remove /** from non-kernel-doc comments in hibernation code (Randy Dunlap). - Fix possible name leak in powercap_register_zone() (Yang Yingliang). - Add Meteor Lake and Emerald Rapids support to the intel_rapl power capping driver (Zhang Rui). - Modify the idle_inject power capping facility to support 100% idle injection (Srinivas Pandruvada). - Fix large time windows handling in the intel_rapl power capping driver (Zhang Rui). - Fix memory leaks with using debugfs_lookup() in the generic PM domains and Energy Model code (Greg Kroah-Hartman). - Add missing 'cache-unified' property in the example for kryo OPP bindings (Rob Herring). - Fix error checking in opp_migrate_dentry() (Qi Zheng). - Let qcom,opp-fuse-level be a 2-long array for qcom SoCs (Konrad Dybcio). - Modify some power management utilities to use the canonical ftrace path (Ross Zwisler). - Correct spelling problems for Documentation/power/ as reported by codespell (Randy Dunlap). -----BEGIN PGP SIGNATURE----- iQJGBAABCAAwFiEE4fcc61cGeeHD/fCwgsRv/nhiVHEFAmPuJfMSHHJqd0Byand5 c29ja2kubmV0AAoJEILEb/54YlRx/5kQAJNOVImLEPLerLP8xufw30//LuDU5Gi0 STsyDOMql/I2MpkeqeCcgrSbpy6NlEglOvg16gfpQ3qqTCLF9ypENxs9E5BGGvW0 aEdCzvaoqmvi9PCr/jmj0EPP70/U+rIX5m/k0QdjLh9x0aLoAEe3uRJTfR9QVqXf I7JX0N9kjKi7YxpA5DlkHrS7J7GPPiWlesJ3p4wXuHMo3jf+6fgkoPFt8yRrGWeh AHzGT2BLrsy7aAUjGZB65Qx9q3fnSXMmXOjmn0Xh2njQah+zRZDwrNzwoY2HTLL/ KQ6/Ww16USYRZtCS1fmGwAj9I+ddq6AOvhPCMn0vLXXmKVAMUrVVWnQS/0+vpm9y suUMK9Tndkgxd1vjby2246ThJn27uDd/ERFan4ouQo2j22uICY+SDo3osj2hMXka wq4zthXkY8KgjZ+MuXnZxPhcOvo8KRvfxAU0fy5efQnSkbtwY9UlMvjPBMBHm/RA 21/6kjQNtq5vMmI37oC8DH+oPrRQ7sUKuY7HNqwO9P3QNKWVmNe7cF5UtXXxME7Q ULvP1d+u+TNNdHFLryPwCSzBO34wQEccdRZBjalZ8tBe6JiDWUFHC3giSURZSuzZ GDvzVaNX6PkgToyv4inBTB8lTp6pAuUjaWNvNJzVvUXiEKHB0ihzg5vpJW5NdwlH 15Tn8cjH7pp0 =lZLx -----END PGP SIGNATURE----- Merge tag 'pm-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "These add EPP support to the AMD P-state cpufreq driver, add support for new platforms to the Intel RAPL power capping driver, intel_idle and the Qualcomm cpufreq driver, enable thermal cooling for Tegra194, drop the custom cpufreq driver for loongson1 that is not necessary any more (and the corresponding cpufreq platform device), fix assorted issues and clean up code. Specifics: - Add EPP support to the AMD P-state cpufreq driver (Perry Yuan, Wyes Karny, Arnd Bergmann, Bagas Sanjaya) - Drop the custom cpufreq driver for loongson1 that is not necessary any more and the corresponding cpufreq platform device (Keguang Zhang) - Remove "select SRCU" from system sleep, cpufreq and OPP Kconfig entries (Paul E. McKenney) - Enable thermal cooling for Tegra194 (Yi-Wei Wang) - Register module device table and add missing compatibles for cpufreq-qcom-hw (Nícolas F. R. A. Prado, Abel Vesa and Luca Weiss) - Various dt binding updates for qcom-cpufreq-nvmem and opp-v2-kryo-cpu (Christian Marangi) - Make kobj_type structure in the cpufreq core constant (Thomas Weißschuh) - Make cpufreq_unregister_driver() return void (Uwe Kleine-König) - Make the TEO cpuidle governor check CPU utilization in order to refine idle state selection (Kajetan Puchalski) - Make Kconfig select the haltpoll cpuidle governor when the haltpoll cpuidle driver is selected and replace a default_idle() call in that driver with arch_cpu_idle() to allow MWAIT to be used (Li RongQing) - Add Emerald Rapids Xeon support to the intel_idle driver (Artem Bityutskiy) - Add ARCH_SUSPEND_POSSIBLE dependencies for ARMv4 cpuidle drivers to avoid randconfig build failures (Arnd Bergmann) - Make kobj_type structures used in the cpuidle sysfs interface constant (Thomas Weißschuh) - Make the cpuidle driver registration code update microsecond values of idle state parameters in accordance with their nanosecond values if they are provided (Rafael Wysocki) - Make the PSCI cpuidle driver prevent topology CPUs from being suspended on PREEMPT_RT (Krzysztof Kozlowski) - Document that pm_runtime_force_suspend() cannot be used with DPM_FLAG_SMART_SUSPEND (Richard Fitzgerald) - Add EXPORT macros for exporting PM functions from drivers (Richard Fitzgerald) - Remove /** from non-kernel-doc comments in hibernation code (Randy Dunlap) - Fix possible name leak in powercap_register_zone() (Yang Yingliang) - Add Meteor Lake and Emerald Rapids support to the intel_rapl power capping driver (Zhang Rui) - Modify the idle_inject power capping facility to support 100% idle injection (Srinivas Pandruvada) - Fix large time windows handling in the intel_rapl power capping driver (Zhang Rui) - Fix memory leaks with using debugfs_lookup() in the generic PM domains and Energy Model code (Greg Kroah-Hartman) - Add missing 'cache-unified' property in the example for kryo OPP bindings (Rob Herring) - Fix error checking in opp_migrate_dentry() (Qi Zheng) - Let qcom,opp-fuse-level be a 2-long array for qcom SoCs (Konrad Dybcio) - Modify some power management utilities to use the canonical ftrace path (Ross Zwisler) - Correct spelling problems for Documentation/power/ as reported by codespell (Randy Dunlap)" * tag 'pm-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (53 commits) Documentation: amd-pstate: disambiguate user space sections cpufreq: amd-pstate: Fix invalid write to MSR_AMD_CPPC_REQ dt-bindings: opp: opp-v2-kryo-cpu: enlarge opp-supported-hw maximum dt-bindings: cpufreq: qcom-cpufreq-nvmem: make cpr bindings optional dt-bindings: cpufreq: qcom-cpufreq-nvmem: specify supported opp tables PM: Add EXPORT macros for exporting PM functions cpuidle: psci: Do not suspend topology CPUs on PREEMPT_RT MIPS: loongson32: Drop obsolete cpufreq platform device powercap: intel_rapl: Fix handling for large time window cpuidle: driver: Update microsecond values of state parameters as needed cpuidle: sysfs: make kobj_type structures constant cpuidle: add ARCH_SUSPEND_POSSIBLE dependencies PM: EM: fix memory leak with using debugfs_lookup() PM: domains: fix memory leak with using debugfs_lookup() cpufreq: Make kobj_type structure constant cpufreq: davinci: Fix clk use after free cpufreq: amd-pstate: avoid uninitialized variable use cpufreq: Make cpufreq_unregister_driver() return void OPP: fix error checking in opp_migrate_dentry() dt-bindings: cpufreq: cpufreq-qcom-hw: Add SM8550 compatible ...
1954 lines
53 KiB
C
1954 lines
53 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/base/power/runtime.c - Helper functions for device runtime PM
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*
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* Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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* Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu>
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*/
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#include <linux/sched/mm.h>
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#include <linux/ktime.h>
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#include <linux/hrtimer.h>
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#include <linux/export.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_wakeirq.h>
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#include <trace/events/rpm.h>
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#include "../base.h"
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#include "power.h"
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typedef int (*pm_callback_t)(struct device *);
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static pm_callback_t __rpm_get_callback(struct device *dev, size_t cb_offset)
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{
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pm_callback_t cb;
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const struct dev_pm_ops *ops;
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if (dev->pm_domain)
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ops = &dev->pm_domain->ops;
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else if (dev->type && dev->type->pm)
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ops = dev->type->pm;
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else if (dev->class && dev->class->pm)
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ops = dev->class->pm;
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else if (dev->bus && dev->bus->pm)
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ops = dev->bus->pm;
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else
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ops = NULL;
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if (ops)
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cb = *(pm_callback_t *)((void *)ops + cb_offset);
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else
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cb = NULL;
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if (!cb && dev->driver && dev->driver->pm)
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cb = *(pm_callback_t *)((void *)dev->driver->pm + cb_offset);
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return cb;
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}
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#define RPM_GET_CALLBACK(dev, callback) \
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__rpm_get_callback(dev, offsetof(struct dev_pm_ops, callback))
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static int rpm_resume(struct device *dev, int rpmflags);
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static int rpm_suspend(struct device *dev, int rpmflags);
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/**
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* update_pm_runtime_accounting - Update the time accounting of power states
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* @dev: Device to update the accounting for
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*
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* In order to be able to have time accounting of the various power states
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* (as used by programs such as PowerTOP to show the effectiveness of runtime
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* PM), we need to track the time spent in each state.
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* update_pm_runtime_accounting must be called each time before the
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* runtime_status field is updated, to account the time in the old state
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* correctly.
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*/
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static void update_pm_runtime_accounting(struct device *dev)
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{
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u64 now, last, delta;
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if (dev->power.disable_depth > 0)
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return;
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last = dev->power.accounting_timestamp;
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now = ktime_get_mono_fast_ns();
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dev->power.accounting_timestamp = now;
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/*
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* Because ktime_get_mono_fast_ns() is not monotonic during
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* timekeeping updates, ensure that 'now' is after the last saved
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* timesptamp.
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*/
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if (now < last)
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return;
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delta = now - last;
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if (dev->power.runtime_status == RPM_SUSPENDED)
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dev->power.suspended_time += delta;
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else
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dev->power.active_time += delta;
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}
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static void __update_runtime_status(struct device *dev, enum rpm_status status)
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{
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update_pm_runtime_accounting(dev);
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dev->power.runtime_status = status;
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}
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static u64 rpm_get_accounted_time(struct device *dev, bool suspended)
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{
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u64 time;
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unsigned long flags;
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spin_lock_irqsave(&dev->power.lock, flags);
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update_pm_runtime_accounting(dev);
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time = suspended ? dev->power.suspended_time : dev->power.active_time;
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spin_unlock_irqrestore(&dev->power.lock, flags);
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return time;
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}
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u64 pm_runtime_active_time(struct device *dev)
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{
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return rpm_get_accounted_time(dev, false);
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}
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u64 pm_runtime_suspended_time(struct device *dev)
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{
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return rpm_get_accounted_time(dev, true);
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}
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EXPORT_SYMBOL_GPL(pm_runtime_suspended_time);
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/**
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* pm_runtime_deactivate_timer - Deactivate given device's suspend timer.
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* @dev: Device to handle.
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*/
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static void pm_runtime_deactivate_timer(struct device *dev)
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{
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if (dev->power.timer_expires > 0) {
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hrtimer_try_to_cancel(&dev->power.suspend_timer);
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dev->power.timer_expires = 0;
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}
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}
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/**
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* pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests.
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* @dev: Device to handle.
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*/
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static void pm_runtime_cancel_pending(struct device *dev)
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{
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pm_runtime_deactivate_timer(dev);
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/*
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* In case there's a request pending, make sure its work function will
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* return without doing anything.
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*/
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dev->power.request = RPM_REQ_NONE;
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}
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/*
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* pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time.
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* @dev: Device to handle.
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*
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* Compute the autosuspend-delay expiration time based on the device's
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* power.last_busy time. If the delay has already expired or is disabled
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* (negative) or the power.use_autosuspend flag isn't set, return 0.
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* Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
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*
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* This function may be called either with or without dev->power.lock held.
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* Either way it can be racy, since power.last_busy may be updated at any time.
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*/
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u64 pm_runtime_autosuspend_expiration(struct device *dev)
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{
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int autosuspend_delay;
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u64 expires;
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if (!dev->power.use_autosuspend)
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return 0;
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autosuspend_delay = READ_ONCE(dev->power.autosuspend_delay);
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if (autosuspend_delay < 0)
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return 0;
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expires = READ_ONCE(dev->power.last_busy);
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expires += (u64)autosuspend_delay * NSEC_PER_MSEC;
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if (expires > ktime_get_mono_fast_ns())
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return expires; /* Expires in the future */
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return 0;
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}
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EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration);
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static int dev_memalloc_noio(struct device *dev, void *data)
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{
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return dev->power.memalloc_noio;
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}
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/*
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* pm_runtime_set_memalloc_noio - Set a device's memalloc_noio flag.
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* @dev: Device to handle.
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* @enable: True for setting the flag and False for clearing the flag.
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*
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* Set the flag for all devices in the path from the device to the
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* root device in the device tree if @enable is true, otherwise clear
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* the flag for devices in the path whose siblings don't set the flag.
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*
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* The function should only be called by block device, or network
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* device driver for solving the deadlock problem during runtime
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* resume/suspend:
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*
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* If memory allocation with GFP_KERNEL is called inside runtime
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* resume/suspend callback of any one of its ancestors(or the
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* block device itself), the deadlock may be triggered inside the
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* memory allocation since it might not complete until the block
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* device becomes active and the involed page I/O finishes. The
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* situation is pointed out first by Alan Stern. Network device
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* are involved in iSCSI kind of situation.
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*
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* The lock of dev_hotplug_mutex is held in the function for handling
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* hotplug race because pm_runtime_set_memalloc_noio() may be called
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* in async probe().
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*
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* The function should be called between device_add() and device_del()
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* on the affected device(block/network device).
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*/
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void pm_runtime_set_memalloc_noio(struct device *dev, bool enable)
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{
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static DEFINE_MUTEX(dev_hotplug_mutex);
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mutex_lock(&dev_hotplug_mutex);
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for (;;) {
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bool enabled;
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/* hold power lock since bitfield is not SMP-safe. */
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spin_lock_irq(&dev->power.lock);
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enabled = dev->power.memalloc_noio;
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dev->power.memalloc_noio = enable;
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spin_unlock_irq(&dev->power.lock);
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/*
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* not need to enable ancestors any more if the device
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* has been enabled.
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*/
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if (enabled && enable)
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break;
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dev = dev->parent;
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/*
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* clear flag of the parent device only if all the
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* children don't set the flag because ancestor's
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* flag was set by any one of the descendants.
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*/
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if (!dev || (!enable &&
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device_for_each_child(dev, NULL, dev_memalloc_noio)))
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break;
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}
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mutex_unlock(&dev_hotplug_mutex);
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}
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EXPORT_SYMBOL_GPL(pm_runtime_set_memalloc_noio);
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/**
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* rpm_check_suspend_allowed - Test whether a device may be suspended.
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* @dev: Device to test.
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*/
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static int rpm_check_suspend_allowed(struct device *dev)
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{
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int retval = 0;
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if (dev->power.runtime_error)
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retval = -EINVAL;
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else if (dev->power.disable_depth > 0)
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retval = -EACCES;
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else if (atomic_read(&dev->power.usage_count))
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retval = -EAGAIN;
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else if (!dev->power.ignore_children && atomic_read(&dev->power.child_count))
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retval = -EBUSY;
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/* Pending resume requests take precedence over suspends. */
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else if ((dev->power.deferred_resume &&
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dev->power.runtime_status == RPM_SUSPENDING) ||
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(dev->power.request_pending && dev->power.request == RPM_REQ_RESUME))
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retval = -EAGAIN;
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else if (__dev_pm_qos_resume_latency(dev) == 0)
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retval = -EPERM;
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else if (dev->power.runtime_status == RPM_SUSPENDED)
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retval = 1;
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return retval;
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}
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static int rpm_get_suppliers(struct device *dev)
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{
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struct device_link *link;
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list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
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device_links_read_lock_held()) {
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int retval;
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if (!(link->flags & DL_FLAG_PM_RUNTIME))
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continue;
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retval = pm_runtime_get_sync(link->supplier);
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/* Ignore suppliers with disabled runtime PM. */
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if (retval < 0 && retval != -EACCES) {
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pm_runtime_put_noidle(link->supplier);
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return retval;
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}
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refcount_inc(&link->rpm_active);
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}
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return 0;
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}
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/**
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* pm_runtime_release_supplier - Drop references to device link's supplier.
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* @link: Target device link.
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*
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* Drop all runtime PM references associated with @link to its supplier device.
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*/
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void pm_runtime_release_supplier(struct device_link *link)
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{
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struct device *supplier = link->supplier;
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/*
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* The additional power.usage_count check is a safety net in case
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* the rpm_active refcount becomes saturated, in which case
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* refcount_dec_not_one() would return true forever, but it is not
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* strictly necessary.
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*/
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while (refcount_dec_not_one(&link->rpm_active) &&
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atomic_read(&supplier->power.usage_count) > 0)
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pm_runtime_put_noidle(supplier);
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}
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static void __rpm_put_suppliers(struct device *dev, bool try_to_suspend)
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{
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struct device_link *link;
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list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
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device_links_read_lock_held()) {
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pm_runtime_release_supplier(link);
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if (try_to_suspend)
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pm_request_idle(link->supplier);
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}
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}
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static void rpm_put_suppliers(struct device *dev)
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{
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__rpm_put_suppliers(dev, true);
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}
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static void rpm_suspend_suppliers(struct device *dev)
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{
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struct device_link *link;
|
|
int idx = device_links_read_lock();
|
|
|
|
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
|
|
device_links_read_lock_held())
|
|
pm_request_idle(link->supplier);
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
/**
|
|
* __rpm_callback - Run a given runtime PM callback for a given device.
|
|
* @cb: Runtime PM callback to run.
|
|
* @dev: Device to run the callback for.
|
|
*/
|
|
static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
|
|
__releases(&dev->power.lock) __acquires(&dev->power.lock)
|
|
{
|
|
int retval = 0, idx;
|
|
bool use_links = dev->power.links_count > 0;
|
|
|
|
if (dev->power.irq_safe) {
|
|
spin_unlock(&dev->power.lock);
|
|
} else {
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
/*
|
|
* Resume suppliers if necessary.
|
|
*
|
|
* The device's runtime PM status cannot change until this
|
|
* routine returns, so it is safe to read the status outside of
|
|
* the lock.
|
|
*/
|
|
if (use_links && dev->power.runtime_status == RPM_RESUMING) {
|
|
idx = device_links_read_lock();
|
|
|
|
retval = rpm_get_suppliers(dev);
|
|
if (retval) {
|
|
rpm_put_suppliers(dev);
|
|
goto fail;
|
|
}
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
}
|
|
|
|
if (cb)
|
|
retval = cb(dev);
|
|
|
|
if (dev->power.irq_safe) {
|
|
spin_lock(&dev->power.lock);
|
|
} else {
|
|
/*
|
|
* If the device is suspending and the callback has returned
|
|
* success, drop the usage counters of the suppliers that have
|
|
* been reference counted on its resume.
|
|
*
|
|
* Do that if resume fails too.
|
|
*/
|
|
if (use_links &&
|
|
((dev->power.runtime_status == RPM_SUSPENDING && !retval) ||
|
|
(dev->power.runtime_status == RPM_RESUMING && retval))) {
|
|
idx = device_links_read_lock();
|
|
|
|
__rpm_put_suppliers(dev, false);
|
|
|
|
fail:
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* rpm_callback - Run a given runtime PM callback for a given device.
|
|
* @cb: Runtime PM callback to run.
|
|
* @dev: Device to run the callback for.
|
|
*/
|
|
static int rpm_callback(int (*cb)(struct device *), struct device *dev)
|
|
{
|
|
int retval;
|
|
|
|
if (dev->power.memalloc_noio) {
|
|
unsigned int noio_flag;
|
|
|
|
/*
|
|
* Deadlock might be caused if memory allocation with
|
|
* GFP_KERNEL happens inside runtime_suspend and
|
|
* runtime_resume callbacks of one block device's
|
|
* ancestor or the block device itself. Network
|
|
* device might be thought as part of iSCSI block
|
|
* device, so network device and its ancestor should
|
|
* be marked as memalloc_noio too.
|
|
*/
|
|
noio_flag = memalloc_noio_save();
|
|
retval = __rpm_callback(cb, dev);
|
|
memalloc_noio_restore(noio_flag);
|
|
} else {
|
|
retval = __rpm_callback(cb, dev);
|
|
}
|
|
|
|
dev->power.runtime_error = retval;
|
|
return retval != -EACCES ? retval : -EIO;
|
|
}
|
|
|
|
/**
|
|
* rpm_idle - Notify device bus type if the device can be suspended.
|
|
* @dev: Device to notify the bus type about.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* Check if the device's runtime PM status allows it to be suspended. If
|
|
* another idle notification has been started earlier, return immediately. If
|
|
* the RPM_ASYNC flag is set then queue an idle-notification request; otherwise
|
|
* run the ->runtime_idle() callback directly. If the ->runtime_idle callback
|
|
* doesn't exist or if it returns 0, call rpm_suspend with the RPM_AUTO flag.
|
|
*
|
|
* This function must be called under dev->power.lock with interrupts disabled.
|
|
*/
|
|
static int rpm_idle(struct device *dev, int rpmflags)
|
|
{
|
|
int (*callback)(struct device *);
|
|
int retval;
|
|
|
|
trace_rpm_idle(dev, rpmflags);
|
|
retval = rpm_check_suspend_allowed(dev);
|
|
if (retval < 0)
|
|
; /* Conditions are wrong. */
|
|
|
|
/* Idle notifications are allowed only in the RPM_ACTIVE state. */
|
|
else if (dev->power.runtime_status != RPM_ACTIVE)
|
|
retval = -EAGAIN;
|
|
|
|
/*
|
|
* Any pending request other than an idle notification takes
|
|
* precedence over us, except that the timer may be running.
|
|
*/
|
|
else if (dev->power.request_pending &&
|
|
dev->power.request > RPM_REQ_IDLE)
|
|
retval = -EAGAIN;
|
|
|
|
/* Act as though RPM_NOWAIT is always set. */
|
|
else if (dev->power.idle_notification)
|
|
retval = -EINPROGRESS;
|
|
|
|
if (retval)
|
|
goto out;
|
|
|
|
/* Pending requests need to be canceled. */
|
|
dev->power.request = RPM_REQ_NONE;
|
|
|
|
callback = RPM_GET_CALLBACK(dev, runtime_idle);
|
|
|
|
/* If no callback assume success. */
|
|
if (!callback || dev->power.no_callbacks)
|
|
goto out;
|
|
|
|
/* Carry out an asynchronous or a synchronous idle notification. */
|
|
if (rpmflags & RPM_ASYNC) {
|
|
dev->power.request = RPM_REQ_IDLE;
|
|
if (!dev->power.request_pending) {
|
|
dev->power.request_pending = true;
|
|
queue_work(pm_wq, &dev->power.work);
|
|
}
|
|
trace_rpm_return_int(dev, _THIS_IP_, 0);
|
|
return 0;
|
|
}
|
|
|
|
dev->power.idle_notification = true;
|
|
|
|
if (dev->power.irq_safe)
|
|
spin_unlock(&dev->power.lock);
|
|
else
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
retval = callback(dev);
|
|
|
|
if (dev->power.irq_safe)
|
|
spin_lock(&dev->power.lock);
|
|
else
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
dev->power.idle_notification = false;
|
|
wake_up_all(&dev->power.wait_queue);
|
|
|
|
out:
|
|
trace_rpm_return_int(dev, _THIS_IP_, retval);
|
|
return retval ? retval : rpm_suspend(dev, rpmflags | RPM_AUTO);
|
|
}
|
|
|
|
/**
|
|
* rpm_suspend - Carry out runtime suspend of given device.
|
|
* @dev: Device to suspend.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* Check if the device's runtime PM status allows it to be suspended.
|
|
* Cancel a pending idle notification, autosuspend or suspend. If
|
|
* another suspend has been started earlier, either return immediately
|
|
* or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC
|
|
* flags. If the RPM_ASYNC flag is set then queue a suspend request;
|
|
* otherwise run the ->runtime_suspend() callback directly. When
|
|
* ->runtime_suspend succeeded, if a deferred resume was requested while
|
|
* the callback was running then carry it out, otherwise send an idle
|
|
* notification for its parent (if the suspend succeeded and both
|
|
* ignore_children of parent->power and irq_safe of dev->power are not set).
|
|
* If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO
|
|
* flag is set and the next autosuspend-delay expiration time is in the
|
|
* future, schedule another autosuspend attempt.
|
|
*
|
|
* This function must be called under dev->power.lock with interrupts disabled.
|
|
*/
|
|
static int rpm_suspend(struct device *dev, int rpmflags)
|
|
__releases(&dev->power.lock) __acquires(&dev->power.lock)
|
|
{
|
|
int (*callback)(struct device *);
|
|
struct device *parent = NULL;
|
|
int retval;
|
|
|
|
trace_rpm_suspend(dev, rpmflags);
|
|
|
|
repeat:
|
|
retval = rpm_check_suspend_allowed(dev);
|
|
if (retval < 0)
|
|
goto out; /* Conditions are wrong. */
|
|
|
|
/* Synchronous suspends are not allowed in the RPM_RESUMING state. */
|
|
if (dev->power.runtime_status == RPM_RESUMING && !(rpmflags & RPM_ASYNC))
|
|
retval = -EAGAIN;
|
|
|
|
if (retval)
|
|
goto out;
|
|
|
|
/* If the autosuspend_delay time hasn't expired yet, reschedule. */
|
|
if ((rpmflags & RPM_AUTO) && dev->power.runtime_status != RPM_SUSPENDING) {
|
|
u64 expires = pm_runtime_autosuspend_expiration(dev);
|
|
|
|
if (expires != 0) {
|
|
/* Pending requests need to be canceled. */
|
|
dev->power.request = RPM_REQ_NONE;
|
|
|
|
/*
|
|
* Optimization: If the timer is already running and is
|
|
* set to expire at or before the autosuspend delay,
|
|
* avoid the overhead of resetting it. Just let it
|
|
* expire; pm_suspend_timer_fn() will take care of the
|
|
* rest.
|
|
*/
|
|
if (!(dev->power.timer_expires &&
|
|
dev->power.timer_expires <= expires)) {
|
|
/*
|
|
* We add a slack of 25% to gather wakeups
|
|
* without sacrificing the granularity.
|
|
*/
|
|
u64 slack = (u64)READ_ONCE(dev->power.autosuspend_delay) *
|
|
(NSEC_PER_MSEC >> 2);
|
|
|
|
dev->power.timer_expires = expires;
|
|
hrtimer_start_range_ns(&dev->power.suspend_timer,
|
|
ns_to_ktime(expires),
|
|
slack,
|
|
HRTIMER_MODE_ABS);
|
|
}
|
|
dev->power.timer_autosuspends = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Other scheduled or pending requests need to be canceled. */
|
|
pm_runtime_cancel_pending(dev);
|
|
|
|
if (dev->power.runtime_status == RPM_SUSPENDING) {
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) {
|
|
retval = -EINPROGRESS;
|
|
goto out;
|
|
}
|
|
|
|
if (dev->power.irq_safe) {
|
|
spin_unlock(&dev->power.lock);
|
|
|
|
cpu_relax();
|
|
|
|
spin_lock(&dev->power.lock);
|
|
goto repeat;
|
|
}
|
|
|
|
/* Wait for the other suspend running in parallel with us. */
|
|
for (;;) {
|
|
prepare_to_wait(&dev->power.wait_queue, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (dev->power.runtime_status != RPM_SUSPENDING)
|
|
break;
|
|
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
schedule();
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
finish_wait(&dev->power.wait_queue, &wait);
|
|
goto repeat;
|
|
}
|
|
|
|
if (dev->power.no_callbacks)
|
|
goto no_callback; /* Assume success. */
|
|
|
|
/* Carry out an asynchronous or a synchronous suspend. */
|
|
if (rpmflags & RPM_ASYNC) {
|
|
dev->power.request = (rpmflags & RPM_AUTO) ?
|
|
RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND;
|
|
if (!dev->power.request_pending) {
|
|
dev->power.request_pending = true;
|
|
queue_work(pm_wq, &dev->power.work);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
__update_runtime_status(dev, RPM_SUSPENDING);
|
|
|
|
callback = RPM_GET_CALLBACK(dev, runtime_suspend);
|
|
|
|
dev_pm_enable_wake_irq_check(dev, true);
|
|
retval = rpm_callback(callback, dev);
|
|
if (retval)
|
|
goto fail;
|
|
|
|
dev_pm_enable_wake_irq_complete(dev);
|
|
|
|
no_callback:
|
|
__update_runtime_status(dev, RPM_SUSPENDED);
|
|
pm_runtime_deactivate_timer(dev);
|
|
|
|
if (dev->parent) {
|
|
parent = dev->parent;
|
|
atomic_add_unless(&parent->power.child_count, -1, 0);
|
|
}
|
|
wake_up_all(&dev->power.wait_queue);
|
|
|
|
if (dev->power.deferred_resume) {
|
|
dev->power.deferred_resume = false;
|
|
rpm_resume(dev, 0);
|
|
retval = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
if (dev->power.irq_safe)
|
|
goto out;
|
|
|
|
/* Maybe the parent is now able to suspend. */
|
|
if (parent && !parent->power.ignore_children) {
|
|
spin_unlock(&dev->power.lock);
|
|
|
|
spin_lock(&parent->power.lock);
|
|
rpm_idle(parent, RPM_ASYNC);
|
|
spin_unlock(&parent->power.lock);
|
|
|
|
spin_lock(&dev->power.lock);
|
|
}
|
|
/* Maybe the suppliers are now able to suspend. */
|
|
if (dev->power.links_count > 0) {
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
rpm_suspend_suppliers(dev);
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
|
|
out:
|
|
trace_rpm_return_int(dev, _THIS_IP_, retval);
|
|
|
|
return retval;
|
|
|
|
fail:
|
|
dev_pm_disable_wake_irq_check(dev, true);
|
|
__update_runtime_status(dev, RPM_ACTIVE);
|
|
dev->power.deferred_resume = false;
|
|
wake_up_all(&dev->power.wait_queue);
|
|
|
|
if (retval == -EAGAIN || retval == -EBUSY) {
|
|
dev->power.runtime_error = 0;
|
|
|
|
/*
|
|
* If the callback routine failed an autosuspend, and
|
|
* if the last_busy time has been updated so that there
|
|
* is a new autosuspend expiration time, automatically
|
|
* reschedule another autosuspend.
|
|
*/
|
|
if ((rpmflags & RPM_AUTO) &&
|
|
pm_runtime_autosuspend_expiration(dev) != 0)
|
|
goto repeat;
|
|
} else {
|
|
pm_runtime_cancel_pending(dev);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* rpm_resume - Carry out runtime resume of given device.
|
|
* @dev: Device to resume.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* Check if the device's runtime PM status allows it to be resumed. Cancel
|
|
* any scheduled or pending requests. If another resume has been started
|
|
* earlier, either return immediately or wait for it to finish, depending on the
|
|
* RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in
|
|
* parallel with this function, either tell the other process to resume after
|
|
* suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC
|
|
* flag is set then queue a resume request; otherwise run the
|
|
* ->runtime_resume() callback directly. Queue an idle notification for the
|
|
* device if the resume succeeded.
|
|
*
|
|
* This function must be called under dev->power.lock with interrupts disabled.
|
|
*/
|
|
static int rpm_resume(struct device *dev, int rpmflags)
|
|
__releases(&dev->power.lock) __acquires(&dev->power.lock)
|
|
{
|
|
int (*callback)(struct device *);
|
|
struct device *parent = NULL;
|
|
int retval = 0;
|
|
|
|
trace_rpm_resume(dev, rpmflags);
|
|
|
|
repeat:
|
|
if (dev->power.runtime_error) {
|
|
retval = -EINVAL;
|
|
} else if (dev->power.disable_depth > 0) {
|
|
if (dev->power.runtime_status == RPM_ACTIVE &&
|
|
dev->power.last_status == RPM_ACTIVE)
|
|
retval = 1;
|
|
else
|
|
retval = -EACCES;
|
|
}
|
|
if (retval)
|
|
goto out;
|
|
|
|
/*
|
|
* Other scheduled or pending requests need to be canceled. Small
|
|
* optimization: If an autosuspend timer is running, leave it running
|
|
* rather than cancelling it now only to restart it again in the near
|
|
* future.
|
|
*/
|
|
dev->power.request = RPM_REQ_NONE;
|
|
if (!dev->power.timer_autosuspends)
|
|
pm_runtime_deactivate_timer(dev);
|
|
|
|
if (dev->power.runtime_status == RPM_ACTIVE) {
|
|
retval = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (dev->power.runtime_status == RPM_RESUMING ||
|
|
dev->power.runtime_status == RPM_SUSPENDING) {
|
|
DEFINE_WAIT(wait);
|
|
|
|
if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) {
|
|
if (dev->power.runtime_status == RPM_SUSPENDING) {
|
|
dev->power.deferred_resume = true;
|
|
if (rpmflags & RPM_NOWAIT)
|
|
retval = -EINPROGRESS;
|
|
} else {
|
|
retval = -EINPROGRESS;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (dev->power.irq_safe) {
|
|
spin_unlock(&dev->power.lock);
|
|
|
|
cpu_relax();
|
|
|
|
spin_lock(&dev->power.lock);
|
|
goto repeat;
|
|
}
|
|
|
|
/* Wait for the operation carried out in parallel with us. */
|
|
for (;;) {
|
|
prepare_to_wait(&dev->power.wait_queue, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (dev->power.runtime_status != RPM_RESUMING &&
|
|
dev->power.runtime_status != RPM_SUSPENDING)
|
|
break;
|
|
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
schedule();
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
finish_wait(&dev->power.wait_queue, &wait);
|
|
goto repeat;
|
|
}
|
|
|
|
/*
|
|
* See if we can skip waking up the parent. This is safe only if
|
|
* power.no_callbacks is set, because otherwise we don't know whether
|
|
* the resume will actually succeed.
|
|
*/
|
|
if (dev->power.no_callbacks && !parent && dev->parent) {
|
|
spin_lock_nested(&dev->parent->power.lock, SINGLE_DEPTH_NESTING);
|
|
if (dev->parent->power.disable_depth > 0 ||
|
|
dev->parent->power.ignore_children ||
|
|
dev->parent->power.runtime_status == RPM_ACTIVE) {
|
|
atomic_inc(&dev->parent->power.child_count);
|
|
spin_unlock(&dev->parent->power.lock);
|
|
retval = 1;
|
|
goto no_callback; /* Assume success. */
|
|
}
|
|
spin_unlock(&dev->parent->power.lock);
|
|
}
|
|
|
|
/* Carry out an asynchronous or a synchronous resume. */
|
|
if (rpmflags & RPM_ASYNC) {
|
|
dev->power.request = RPM_REQ_RESUME;
|
|
if (!dev->power.request_pending) {
|
|
dev->power.request_pending = true;
|
|
queue_work(pm_wq, &dev->power.work);
|
|
}
|
|
retval = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!parent && dev->parent) {
|
|
/*
|
|
* Increment the parent's usage counter and resume it if
|
|
* necessary. Not needed if dev is irq-safe; then the
|
|
* parent is permanently resumed.
|
|
*/
|
|
parent = dev->parent;
|
|
if (dev->power.irq_safe)
|
|
goto skip_parent;
|
|
|
|
spin_unlock(&dev->power.lock);
|
|
|
|
pm_runtime_get_noresume(parent);
|
|
|
|
spin_lock(&parent->power.lock);
|
|
/*
|
|
* Resume the parent if it has runtime PM enabled and not been
|
|
* set to ignore its children.
|
|
*/
|
|
if (!parent->power.disable_depth &&
|
|
!parent->power.ignore_children) {
|
|
rpm_resume(parent, 0);
|
|
if (parent->power.runtime_status != RPM_ACTIVE)
|
|
retval = -EBUSY;
|
|
}
|
|
spin_unlock(&parent->power.lock);
|
|
|
|
spin_lock(&dev->power.lock);
|
|
if (retval)
|
|
goto out;
|
|
|
|
goto repeat;
|
|
}
|
|
skip_parent:
|
|
|
|
if (dev->power.no_callbacks)
|
|
goto no_callback; /* Assume success. */
|
|
|
|
__update_runtime_status(dev, RPM_RESUMING);
|
|
|
|
callback = RPM_GET_CALLBACK(dev, runtime_resume);
|
|
|
|
dev_pm_disable_wake_irq_check(dev, false);
|
|
retval = rpm_callback(callback, dev);
|
|
if (retval) {
|
|
__update_runtime_status(dev, RPM_SUSPENDED);
|
|
pm_runtime_cancel_pending(dev);
|
|
dev_pm_enable_wake_irq_check(dev, false);
|
|
} else {
|
|
no_callback:
|
|
__update_runtime_status(dev, RPM_ACTIVE);
|
|
pm_runtime_mark_last_busy(dev);
|
|
if (parent)
|
|
atomic_inc(&parent->power.child_count);
|
|
}
|
|
wake_up_all(&dev->power.wait_queue);
|
|
|
|
if (retval >= 0)
|
|
rpm_idle(dev, RPM_ASYNC);
|
|
|
|
out:
|
|
if (parent && !dev->power.irq_safe) {
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
pm_runtime_put(parent);
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
|
|
trace_rpm_return_int(dev, _THIS_IP_, retval);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_work - Universal runtime PM work function.
|
|
* @work: Work structure used for scheduling the execution of this function.
|
|
*
|
|
* Use @work to get the device object the work is to be done for, determine what
|
|
* is to be done and execute the appropriate runtime PM function.
|
|
*/
|
|
static void pm_runtime_work(struct work_struct *work)
|
|
{
|
|
struct device *dev = container_of(work, struct device, power.work);
|
|
enum rpm_request req;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
if (!dev->power.request_pending)
|
|
goto out;
|
|
|
|
req = dev->power.request;
|
|
dev->power.request = RPM_REQ_NONE;
|
|
dev->power.request_pending = false;
|
|
|
|
switch (req) {
|
|
case RPM_REQ_NONE:
|
|
break;
|
|
case RPM_REQ_IDLE:
|
|
rpm_idle(dev, RPM_NOWAIT);
|
|
break;
|
|
case RPM_REQ_SUSPEND:
|
|
rpm_suspend(dev, RPM_NOWAIT);
|
|
break;
|
|
case RPM_REQ_AUTOSUSPEND:
|
|
rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO);
|
|
break;
|
|
case RPM_REQ_RESUME:
|
|
rpm_resume(dev, RPM_NOWAIT);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
|
|
/**
|
|
* pm_suspend_timer_fn - Timer function for pm_schedule_suspend().
|
|
* @timer: hrtimer used by pm_schedule_suspend().
|
|
*
|
|
* Check if the time is right and queue a suspend request.
|
|
*/
|
|
static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
|
|
{
|
|
struct device *dev = container_of(timer, struct device, power.suspend_timer);
|
|
unsigned long flags;
|
|
u64 expires;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
expires = dev->power.timer_expires;
|
|
/*
|
|
* If 'expires' is after the current time, we've been called
|
|
* too early.
|
|
*/
|
|
if (expires > 0 && expires < ktime_get_mono_fast_ns()) {
|
|
dev->power.timer_expires = 0;
|
|
rpm_suspend(dev, dev->power.timer_autosuspends ?
|
|
(RPM_ASYNC | RPM_AUTO) : RPM_ASYNC);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/**
|
|
* pm_schedule_suspend - Set up a timer to submit a suspend request in future.
|
|
* @dev: Device to suspend.
|
|
* @delay: Time to wait before submitting a suspend request, in milliseconds.
|
|
*/
|
|
int pm_schedule_suspend(struct device *dev, unsigned int delay)
|
|
{
|
|
unsigned long flags;
|
|
u64 expires;
|
|
int retval;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
if (!delay) {
|
|
retval = rpm_suspend(dev, RPM_ASYNC);
|
|
goto out;
|
|
}
|
|
|
|
retval = rpm_check_suspend_allowed(dev);
|
|
if (retval)
|
|
goto out;
|
|
|
|
/* Other scheduled or pending requests need to be canceled. */
|
|
pm_runtime_cancel_pending(dev);
|
|
|
|
expires = ktime_get_mono_fast_ns() + (u64)delay * NSEC_PER_MSEC;
|
|
dev->power.timer_expires = expires;
|
|
dev->power.timer_autosuspends = 0;
|
|
hrtimer_start(&dev->power.suspend_timer, expires, HRTIMER_MODE_ABS);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_schedule_suspend);
|
|
|
|
static int rpm_drop_usage_count(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = atomic_sub_return(1, &dev->power.usage_count);
|
|
if (ret >= 0)
|
|
return ret;
|
|
|
|
/*
|
|
* Because rpm_resume() does not check the usage counter, it will resume
|
|
* the device even if the usage counter is 0 or negative, so it is
|
|
* sufficient to increment the usage counter here to reverse the change
|
|
* made above.
|
|
*/
|
|
atomic_inc(&dev->power.usage_count);
|
|
dev_warn(dev, "Runtime PM usage count underflow!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* __pm_runtime_idle - Entry point for runtime idle operations.
|
|
* @dev: Device to send idle notification for.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* If the RPM_GET_PUT flag is set, decrement the device's usage count and
|
|
* return immediately if it is larger than zero (if it becomes negative, log a
|
|
* warning, increment it, and return an error). Then carry out an idle
|
|
* notification, either synchronous or asynchronous.
|
|
*
|
|
* This routine may be called in atomic context if the RPM_ASYNC flag is set,
|
|
* or if pm_runtime_irq_safe() has been called.
|
|
*/
|
|
int __pm_runtime_idle(struct device *dev, int rpmflags)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
if (rpmflags & RPM_GET_PUT) {
|
|
retval = rpm_drop_usage_count(dev);
|
|
if (retval < 0) {
|
|
return retval;
|
|
} else if (retval > 0) {
|
|
trace_rpm_usage(dev, rpmflags);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
retval = rpm_idle(dev, rpmflags);
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_idle);
|
|
|
|
/**
|
|
* __pm_runtime_suspend - Entry point for runtime put/suspend operations.
|
|
* @dev: Device to suspend.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* If the RPM_GET_PUT flag is set, decrement the device's usage count and
|
|
* return immediately if it is larger than zero (if it becomes negative, log a
|
|
* warning, increment it, and return an error). Then carry out a suspend,
|
|
* either synchronous or asynchronous.
|
|
*
|
|
* This routine may be called in atomic context if the RPM_ASYNC flag is set,
|
|
* or if pm_runtime_irq_safe() has been called.
|
|
*/
|
|
int __pm_runtime_suspend(struct device *dev, int rpmflags)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
if (rpmflags & RPM_GET_PUT) {
|
|
retval = rpm_drop_usage_count(dev);
|
|
if (retval < 0) {
|
|
return retval;
|
|
} else if (retval > 0) {
|
|
trace_rpm_usage(dev, rpmflags);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
retval = rpm_suspend(dev, rpmflags);
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_suspend);
|
|
|
|
/**
|
|
* __pm_runtime_resume - Entry point for runtime resume operations.
|
|
* @dev: Device to resume.
|
|
* @rpmflags: Flag bits.
|
|
*
|
|
* If the RPM_GET_PUT flag is set, increment the device's usage count. Then
|
|
* carry out a resume, either synchronous or asynchronous.
|
|
*
|
|
* This routine may be called in atomic context if the RPM_ASYNC flag is set,
|
|
* or if pm_runtime_irq_safe() has been called.
|
|
*/
|
|
int __pm_runtime_resume(struct device *dev, int rpmflags)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe &&
|
|
dev->power.runtime_status != RPM_ACTIVE);
|
|
|
|
if (rpmflags & RPM_GET_PUT)
|
|
atomic_inc(&dev->power.usage_count);
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
retval = rpm_resume(dev, rpmflags);
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_resume);
|
|
|
|
/**
|
|
* pm_runtime_get_if_active - Conditionally bump up device usage counter.
|
|
* @dev: Device to handle.
|
|
* @ign_usage_count: Whether or not to look at the current usage counter value.
|
|
*
|
|
* Return -EINVAL if runtime PM is disabled for @dev.
|
|
*
|
|
* Otherwise, if the runtime PM status of @dev is %RPM_ACTIVE and either
|
|
* @ign_usage_count is %true or the runtime PM usage counter of @dev is not
|
|
* zero, increment the usage counter of @dev and return 1. Otherwise, return 0
|
|
* without changing the usage counter.
|
|
*
|
|
* If @ign_usage_count is %true, this function can be used to prevent suspending
|
|
* the device when its runtime PM status is %RPM_ACTIVE.
|
|
*
|
|
* If @ign_usage_count is %false, this function can be used to prevent
|
|
* suspending the device when both its runtime PM status is %RPM_ACTIVE and its
|
|
* runtime PM usage counter is not zero.
|
|
*
|
|
* The caller is responsible for decrementing the runtime PM usage counter of
|
|
* @dev after this function has returned a positive value for it.
|
|
*/
|
|
int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
if (dev->power.disable_depth > 0) {
|
|
retval = -EINVAL;
|
|
} else if (dev->power.runtime_status != RPM_ACTIVE) {
|
|
retval = 0;
|
|
} else if (ign_usage_count) {
|
|
retval = 1;
|
|
atomic_inc(&dev->power.usage_count);
|
|
} else {
|
|
retval = atomic_inc_not_zero(&dev->power.usage_count);
|
|
}
|
|
trace_rpm_usage(dev, 0);
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_get_if_active);
|
|
|
|
/**
|
|
* __pm_runtime_set_status - Set runtime PM status of a device.
|
|
* @dev: Device to handle.
|
|
* @status: New runtime PM status of the device.
|
|
*
|
|
* If runtime PM of the device is disabled or its power.runtime_error field is
|
|
* different from zero, the status may be changed either to RPM_ACTIVE, or to
|
|
* RPM_SUSPENDED, as long as that reflects the actual state of the device.
|
|
* However, if the device has a parent and the parent is not active, and the
|
|
* parent's power.ignore_children flag is unset, the device's status cannot be
|
|
* set to RPM_ACTIVE, so -EBUSY is returned in that case.
|
|
*
|
|
* If successful, __pm_runtime_set_status() clears the power.runtime_error field
|
|
* and the device parent's counter of unsuspended children is modified to
|
|
* reflect the new status. If the new status is RPM_SUSPENDED, an idle
|
|
* notification request for the parent is submitted.
|
|
*
|
|
* If @dev has any suppliers (as reflected by device links to them), and @status
|
|
* is RPM_ACTIVE, they will be activated upfront and if the activation of one
|
|
* of them fails, the status of @dev will be changed to RPM_SUSPENDED (instead
|
|
* of the @status value) and the suppliers will be deacticated on exit. The
|
|
* error returned by the failing supplier activation will be returned in that
|
|
* case.
|
|
*/
|
|
int __pm_runtime_set_status(struct device *dev, unsigned int status)
|
|
{
|
|
struct device *parent = dev->parent;
|
|
bool notify_parent = false;
|
|
unsigned long flags;
|
|
int error = 0;
|
|
|
|
if (status != RPM_ACTIVE && status != RPM_SUSPENDED)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
/*
|
|
* Prevent PM-runtime from being enabled for the device or return an
|
|
* error if it is enabled already and working.
|
|
*/
|
|
if (dev->power.runtime_error || dev->power.disable_depth)
|
|
dev->power.disable_depth++;
|
|
else
|
|
error = -EAGAIN;
|
|
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If the new status is RPM_ACTIVE, the suppliers can be activated
|
|
* upfront regardless of the current status, because next time
|
|
* rpm_put_suppliers() runs, the rpm_active refcounts of the links
|
|
* involved will be dropped down to one anyway.
|
|
*/
|
|
if (status == RPM_ACTIVE) {
|
|
int idx = device_links_read_lock();
|
|
|
|
error = rpm_get_suppliers(dev);
|
|
if (error)
|
|
status = RPM_SUSPENDED;
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
if (dev->power.runtime_status == status || !parent)
|
|
goto out_set;
|
|
|
|
if (status == RPM_SUSPENDED) {
|
|
atomic_add_unless(&parent->power.child_count, -1, 0);
|
|
notify_parent = !parent->power.ignore_children;
|
|
} else {
|
|
spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING);
|
|
|
|
/*
|
|
* It is invalid to put an active child under a parent that is
|
|
* not active, has runtime PM enabled and the
|
|
* 'power.ignore_children' flag unset.
|
|
*/
|
|
if (!parent->power.disable_depth &&
|
|
!parent->power.ignore_children &&
|
|
parent->power.runtime_status != RPM_ACTIVE) {
|
|
dev_err(dev, "runtime PM trying to activate child device %s but parent (%s) is not active\n",
|
|
dev_name(dev),
|
|
dev_name(parent));
|
|
error = -EBUSY;
|
|
} else if (dev->power.runtime_status == RPM_SUSPENDED) {
|
|
atomic_inc(&parent->power.child_count);
|
|
}
|
|
|
|
spin_unlock(&parent->power.lock);
|
|
|
|
if (error) {
|
|
status = RPM_SUSPENDED;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out_set:
|
|
__update_runtime_status(dev, status);
|
|
if (!error)
|
|
dev->power.runtime_error = 0;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
|
|
if (notify_parent)
|
|
pm_request_idle(parent);
|
|
|
|
if (status == RPM_SUSPENDED) {
|
|
int idx = device_links_read_lock();
|
|
|
|
rpm_put_suppliers(dev);
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
pm_runtime_enable(dev);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_set_status);
|
|
|
|
/**
|
|
* __pm_runtime_barrier - Cancel pending requests and wait for completions.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Flush all pending requests for the device from pm_wq and wait for all
|
|
* runtime PM operations involving the device in progress to complete.
|
|
*
|
|
* Should be called under dev->power.lock with interrupts disabled.
|
|
*/
|
|
static void __pm_runtime_barrier(struct device *dev)
|
|
{
|
|
pm_runtime_deactivate_timer(dev);
|
|
|
|
if (dev->power.request_pending) {
|
|
dev->power.request = RPM_REQ_NONE;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
cancel_work_sync(&dev->power.work);
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.request_pending = false;
|
|
}
|
|
|
|
if (dev->power.runtime_status == RPM_SUSPENDING ||
|
|
dev->power.runtime_status == RPM_RESUMING ||
|
|
dev->power.idle_notification) {
|
|
DEFINE_WAIT(wait);
|
|
|
|
/* Suspend, wake-up or idle notification in progress. */
|
|
for (;;) {
|
|
prepare_to_wait(&dev->power.wait_queue, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
if (dev->power.runtime_status != RPM_SUSPENDING
|
|
&& dev->power.runtime_status != RPM_RESUMING
|
|
&& !dev->power.idle_notification)
|
|
break;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
|
|
schedule();
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
}
|
|
finish_wait(&dev->power.wait_queue, &wait);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_barrier - Flush pending requests and wait for completions.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Prevent the device from being suspended by incrementing its usage counter and
|
|
* if there's a pending resume request for the device, wake the device up.
|
|
* Next, make sure that all pending requests for the device have been flushed
|
|
* from pm_wq and wait for all runtime PM operations involving the device in
|
|
* progress to complete.
|
|
*
|
|
* Return value:
|
|
* 1, if there was a resume request pending and the device had to be woken up,
|
|
* 0, otherwise
|
|
*/
|
|
int pm_runtime_barrier(struct device *dev)
|
|
{
|
|
int retval = 0;
|
|
|
|
pm_runtime_get_noresume(dev);
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
if (dev->power.request_pending
|
|
&& dev->power.request == RPM_REQ_RESUME) {
|
|
rpm_resume(dev, 0);
|
|
retval = 1;
|
|
}
|
|
|
|
__pm_runtime_barrier(dev);
|
|
|
|
spin_unlock_irq(&dev->power.lock);
|
|
pm_runtime_put_noidle(dev);
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_barrier);
|
|
|
|
/**
|
|
* __pm_runtime_disable - Disable runtime PM of a device.
|
|
* @dev: Device to handle.
|
|
* @check_resume: If set, check if there's a resume request for the device.
|
|
*
|
|
* Increment power.disable_depth for the device and if it was zero previously,
|
|
* cancel all pending runtime PM requests for the device and wait for all
|
|
* operations in progress to complete. The device can be either active or
|
|
* suspended after its runtime PM has been disabled.
|
|
*
|
|
* If @check_resume is set and there's a resume request pending when
|
|
* __pm_runtime_disable() is called and power.disable_depth is zero, the
|
|
* function will wake up the device before disabling its runtime PM.
|
|
*/
|
|
void __pm_runtime_disable(struct device *dev, bool check_resume)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
|
|
if (dev->power.disable_depth > 0) {
|
|
dev->power.disable_depth++;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Wake up the device if there's a resume request pending, because that
|
|
* means there probably is some I/O to process and disabling runtime PM
|
|
* shouldn't prevent the device from processing the I/O.
|
|
*/
|
|
if (check_resume && dev->power.request_pending &&
|
|
dev->power.request == RPM_REQ_RESUME) {
|
|
/*
|
|
* Prevent suspends and idle notifications from being carried
|
|
* out after we have woken up the device.
|
|
*/
|
|
pm_runtime_get_noresume(dev);
|
|
|
|
rpm_resume(dev, 0);
|
|
|
|
pm_runtime_put_noidle(dev);
|
|
}
|
|
|
|
/* Update time accounting before disabling PM-runtime. */
|
|
update_pm_runtime_accounting(dev);
|
|
|
|
if (!dev->power.disable_depth++) {
|
|
__pm_runtime_barrier(dev);
|
|
dev->power.last_status = dev->power.runtime_status;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_disable);
|
|
|
|
/**
|
|
* pm_runtime_enable - Enable runtime PM of a device.
|
|
* @dev: Device to handle.
|
|
*/
|
|
void pm_runtime_enable(struct device *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->power.lock, flags);
|
|
|
|
if (!dev->power.disable_depth) {
|
|
dev_warn(dev, "Unbalanced %s!\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
if (--dev->power.disable_depth > 0)
|
|
goto out;
|
|
|
|
dev->power.last_status = RPM_INVALID;
|
|
dev->power.accounting_timestamp = ktime_get_mono_fast_ns();
|
|
|
|
if (dev->power.runtime_status == RPM_SUSPENDED &&
|
|
!dev->power.ignore_children &&
|
|
atomic_read(&dev->power.child_count) > 0)
|
|
dev_warn(dev, "Enabling runtime PM for inactive device with active children\n");
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&dev->power.lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_enable);
|
|
|
|
static void pm_runtime_disable_action(void *data)
|
|
{
|
|
pm_runtime_dont_use_autosuspend(data);
|
|
pm_runtime_disable(data);
|
|
}
|
|
|
|
/**
|
|
* devm_pm_runtime_enable - devres-enabled version of pm_runtime_enable.
|
|
*
|
|
* NOTE: this will also handle calling pm_runtime_dont_use_autosuspend() for
|
|
* you at driver exit time if needed.
|
|
*
|
|
* @dev: Device to handle.
|
|
*/
|
|
int devm_pm_runtime_enable(struct device *dev)
|
|
{
|
|
pm_runtime_enable(dev);
|
|
|
|
return devm_add_action_or_reset(dev, pm_runtime_disable_action, dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_pm_runtime_enable);
|
|
|
|
/**
|
|
* pm_runtime_forbid - Block runtime PM of a device.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Increase the device's usage count and clear its power.runtime_auto flag,
|
|
* so that it cannot be suspended at run time until pm_runtime_allow() is called
|
|
* for it.
|
|
*/
|
|
void pm_runtime_forbid(struct device *dev)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
if (!dev->power.runtime_auto)
|
|
goto out;
|
|
|
|
dev->power.runtime_auto = false;
|
|
atomic_inc(&dev->power.usage_count);
|
|
rpm_resume(dev, 0);
|
|
|
|
out:
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_forbid);
|
|
|
|
/**
|
|
* pm_runtime_allow - Unblock runtime PM of a device.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Decrease the device's usage count and set its power.runtime_auto flag.
|
|
*/
|
|
void pm_runtime_allow(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
if (dev->power.runtime_auto)
|
|
goto out;
|
|
|
|
dev->power.runtime_auto = true;
|
|
ret = rpm_drop_usage_count(dev);
|
|
if (ret == 0)
|
|
rpm_idle(dev, RPM_AUTO | RPM_ASYNC);
|
|
else if (ret > 0)
|
|
trace_rpm_usage(dev, RPM_AUTO | RPM_ASYNC);
|
|
|
|
out:
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_allow);
|
|
|
|
/**
|
|
* pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Set the power.no_callbacks flag, which tells the PM core that this
|
|
* device is power-managed through its parent and has no runtime PM
|
|
* callbacks of its own. The runtime sysfs attributes will be removed.
|
|
*/
|
|
void pm_runtime_no_callbacks(struct device *dev)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.no_callbacks = 1;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
if (device_is_registered(dev))
|
|
rpm_sysfs_remove(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks);
|
|
|
|
/**
|
|
* pm_runtime_irq_safe - Leave interrupts disabled during callbacks.
|
|
* @dev: Device to handle
|
|
*
|
|
* Set the power.irq_safe flag, which tells the PM core that the
|
|
* ->runtime_suspend() and ->runtime_resume() callbacks for this device should
|
|
* always be invoked with the spinlock held and interrupts disabled. It also
|
|
* causes the parent's usage counter to be permanently incremented, preventing
|
|
* the parent from runtime suspending -- otherwise an irq-safe child might have
|
|
* to wait for a non-irq-safe parent.
|
|
*/
|
|
void pm_runtime_irq_safe(struct device *dev)
|
|
{
|
|
if (dev->parent)
|
|
pm_runtime_get_sync(dev->parent);
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.irq_safe = 1;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_irq_safe);
|
|
|
|
/**
|
|
* update_autosuspend - Handle a change to a device's autosuspend settings.
|
|
* @dev: Device to handle.
|
|
* @old_delay: The former autosuspend_delay value.
|
|
* @old_use: The former use_autosuspend value.
|
|
*
|
|
* Prevent runtime suspend if the new delay is negative and use_autosuspend is
|
|
* set; otherwise allow it. Send an idle notification if suspends are allowed.
|
|
*
|
|
* This function must be called under dev->power.lock with interrupts disabled.
|
|
*/
|
|
static void update_autosuspend(struct device *dev, int old_delay, int old_use)
|
|
{
|
|
int delay = dev->power.autosuspend_delay;
|
|
|
|
/* Should runtime suspend be prevented now? */
|
|
if (dev->power.use_autosuspend && delay < 0) {
|
|
|
|
/* If it used to be allowed then prevent it. */
|
|
if (!old_use || old_delay >= 0) {
|
|
atomic_inc(&dev->power.usage_count);
|
|
rpm_resume(dev, 0);
|
|
} else {
|
|
trace_rpm_usage(dev, 0);
|
|
}
|
|
}
|
|
|
|
/* Runtime suspend should be allowed now. */
|
|
else {
|
|
|
|
/* If it used to be prevented then allow it. */
|
|
if (old_use && old_delay < 0)
|
|
atomic_dec(&dev->power.usage_count);
|
|
|
|
/* Maybe we can autosuspend now. */
|
|
rpm_idle(dev, RPM_AUTO);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value.
|
|
* @dev: Device to handle.
|
|
* @delay: Value of the new delay in milliseconds.
|
|
*
|
|
* Set the device's power.autosuspend_delay value. If it changes to negative
|
|
* and the power.use_autosuspend flag is set, prevent runtime suspends. If it
|
|
* changes the other way, allow runtime suspends.
|
|
*/
|
|
void pm_runtime_set_autosuspend_delay(struct device *dev, int delay)
|
|
{
|
|
int old_delay, old_use;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
old_delay = dev->power.autosuspend_delay;
|
|
old_use = dev->power.use_autosuspend;
|
|
dev->power.autosuspend_delay = delay;
|
|
update_autosuspend(dev, old_delay, old_use);
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay);
|
|
|
|
/**
|
|
* __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag.
|
|
* @dev: Device to handle.
|
|
* @use: New value for use_autosuspend.
|
|
*
|
|
* Set the device's power.use_autosuspend flag, and allow or prevent runtime
|
|
* suspends as needed.
|
|
*/
|
|
void __pm_runtime_use_autosuspend(struct device *dev, bool use)
|
|
{
|
|
int old_delay, old_use;
|
|
|
|
spin_lock_irq(&dev->power.lock);
|
|
old_delay = dev->power.autosuspend_delay;
|
|
old_use = dev->power.use_autosuspend;
|
|
dev->power.use_autosuspend = use;
|
|
update_autosuspend(dev, old_delay, old_use);
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend);
|
|
|
|
/**
|
|
* pm_runtime_init - Initialize runtime PM fields in given device object.
|
|
* @dev: Device object to initialize.
|
|
*/
|
|
void pm_runtime_init(struct device *dev)
|
|
{
|
|
dev->power.runtime_status = RPM_SUSPENDED;
|
|
dev->power.last_status = RPM_INVALID;
|
|
dev->power.idle_notification = false;
|
|
|
|
dev->power.disable_depth = 1;
|
|
atomic_set(&dev->power.usage_count, 0);
|
|
|
|
dev->power.runtime_error = 0;
|
|
|
|
atomic_set(&dev->power.child_count, 0);
|
|
pm_suspend_ignore_children(dev, false);
|
|
dev->power.runtime_auto = true;
|
|
|
|
dev->power.request_pending = false;
|
|
dev->power.request = RPM_REQ_NONE;
|
|
dev->power.deferred_resume = false;
|
|
dev->power.needs_force_resume = 0;
|
|
INIT_WORK(&dev->power.work, pm_runtime_work);
|
|
|
|
dev->power.timer_expires = 0;
|
|
hrtimer_init(&dev->power.suspend_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
|
dev->power.suspend_timer.function = pm_suspend_timer_fn;
|
|
|
|
init_waitqueue_head(&dev->power.wait_queue);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_reinit - Re-initialize runtime PM fields in given device object.
|
|
* @dev: Device object to re-initialize.
|
|
*/
|
|
void pm_runtime_reinit(struct device *dev)
|
|
{
|
|
if (!pm_runtime_enabled(dev)) {
|
|
if (dev->power.runtime_status == RPM_ACTIVE)
|
|
pm_runtime_set_suspended(dev);
|
|
if (dev->power.irq_safe) {
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.irq_safe = 0;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
if (dev->parent)
|
|
pm_runtime_put(dev->parent);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_remove - Prepare for removing a device from device hierarchy.
|
|
* @dev: Device object being removed from device hierarchy.
|
|
*/
|
|
void pm_runtime_remove(struct device *dev)
|
|
{
|
|
__pm_runtime_disable(dev, false);
|
|
pm_runtime_reinit(dev);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_get_suppliers - Resume and reference-count supplier devices.
|
|
* @dev: Consumer device.
|
|
*/
|
|
void pm_runtime_get_suppliers(struct device *dev)
|
|
{
|
|
struct device_link *link;
|
|
int idx;
|
|
|
|
idx = device_links_read_lock();
|
|
|
|
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
|
|
device_links_read_lock_held())
|
|
if (link->flags & DL_FLAG_PM_RUNTIME) {
|
|
link->supplier_preactivated = true;
|
|
pm_runtime_get_sync(link->supplier);
|
|
}
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_put_suppliers - Drop references to supplier devices.
|
|
* @dev: Consumer device.
|
|
*/
|
|
void pm_runtime_put_suppliers(struct device *dev)
|
|
{
|
|
struct device_link *link;
|
|
int idx;
|
|
|
|
idx = device_links_read_lock();
|
|
|
|
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node,
|
|
device_links_read_lock_held())
|
|
if (link->supplier_preactivated) {
|
|
link->supplier_preactivated = false;
|
|
pm_runtime_put(link->supplier);
|
|
}
|
|
|
|
device_links_read_unlock(idx);
|
|
}
|
|
|
|
void pm_runtime_new_link(struct device *dev)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
dev->power.links_count++;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
|
|
static void pm_runtime_drop_link_count(struct device *dev)
|
|
{
|
|
spin_lock_irq(&dev->power.lock);
|
|
WARN_ON(dev->power.links_count == 0);
|
|
dev->power.links_count--;
|
|
spin_unlock_irq(&dev->power.lock);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_drop_link - Prepare for device link removal.
|
|
* @link: Device link going away.
|
|
*
|
|
* Drop the link count of the consumer end of @link and decrement the supplier
|
|
* device's runtime PM usage counter as many times as needed to drop all of the
|
|
* PM runtime reference to it from the consumer.
|
|
*/
|
|
void pm_runtime_drop_link(struct device_link *link)
|
|
{
|
|
if (!(link->flags & DL_FLAG_PM_RUNTIME))
|
|
return;
|
|
|
|
pm_runtime_drop_link_count(link->consumer);
|
|
pm_runtime_release_supplier(link);
|
|
pm_request_idle(link->supplier);
|
|
}
|
|
|
|
static bool pm_runtime_need_not_resume(struct device *dev)
|
|
{
|
|
return atomic_read(&dev->power.usage_count) <= 1 &&
|
|
(atomic_read(&dev->power.child_count) == 0 ||
|
|
dev->power.ignore_children);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_force_suspend - Force a device into suspend state if needed.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Disable runtime PM so we safely can check the device's runtime PM status and
|
|
* if it is active, invoke its ->runtime_suspend callback to suspend it and
|
|
* change its runtime PM status field to RPM_SUSPENDED. Also, if the device's
|
|
* usage and children counters don't indicate that the device was in use before
|
|
* the system-wide transition under way, decrement its parent's children counter
|
|
* (if there is a parent). Keep runtime PM disabled to preserve the state
|
|
* unless we encounter errors.
|
|
*
|
|
* Typically this function may be invoked from a system suspend callback to make
|
|
* sure the device is put into low power state and it should only be used during
|
|
* system-wide PM transitions to sleep states. It assumes that the analogous
|
|
* pm_runtime_force_resume() will be used to resume the device.
|
|
*
|
|
* Do not use with DPM_FLAG_SMART_SUSPEND as this can lead to an inconsistent
|
|
* state where this function has called the ->runtime_suspend callback but the
|
|
* PM core marks the driver as runtime active.
|
|
*/
|
|
int pm_runtime_force_suspend(struct device *dev)
|
|
{
|
|
int (*callback)(struct device *);
|
|
int ret;
|
|
|
|
pm_runtime_disable(dev);
|
|
if (pm_runtime_status_suspended(dev))
|
|
return 0;
|
|
|
|
callback = RPM_GET_CALLBACK(dev, runtime_suspend);
|
|
|
|
dev_pm_enable_wake_irq_check(dev, true);
|
|
ret = callback ? callback(dev) : 0;
|
|
if (ret)
|
|
goto err;
|
|
|
|
dev_pm_enable_wake_irq_complete(dev);
|
|
|
|
/*
|
|
* If the device can stay in suspend after the system-wide transition
|
|
* to the working state that will follow, drop the children counter of
|
|
* its parent, but set its status to RPM_SUSPENDED anyway in case this
|
|
* function will be called again for it in the meantime.
|
|
*/
|
|
if (pm_runtime_need_not_resume(dev)) {
|
|
pm_runtime_set_suspended(dev);
|
|
} else {
|
|
__update_runtime_status(dev, RPM_SUSPENDED);
|
|
dev->power.needs_force_resume = 1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
dev_pm_disable_wake_irq_check(dev, true);
|
|
pm_runtime_enable(dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pm_runtime_force_suspend);
|
|
|
|
/**
|
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* pm_runtime_force_resume - Force a device into resume state if needed.
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* @dev: Device to resume.
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*
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* Prior invoking this function we expect the user to have brought the device
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* into low power state by a call to pm_runtime_force_suspend(). Here we reverse
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* those actions and bring the device into full power, if it is expected to be
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* used on system resume. In the other case, we defer the resume to be managed
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* via runtime PM.
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*
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* Typically this function may be invoked from a system resume callback.
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*/
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int pm_runtime_force_resume(struct device *dev)
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{
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int (*callback)(struct device *);
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int ret = 0;
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if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
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goto out;
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/*
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* The value of the parent's children counter is correct already, so
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* just update the status of the device.
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*/
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__update_runtime_status(dev, RPM_ACTIVE);
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callback = RPM_GET_CALLBACK(dev, runtime_resume);
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dev_pm_disable_wake_irq_check(dev, false);
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ret = callback ? callback(dev) : 0;
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if (ret) {
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pm_runtime_set_suspended(dev);
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dev_pm_enable_wake_irq_check(dev, false);
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goto out;
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}
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pm_runtime_mark_last_busy(dev);
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out:
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dev->power.needs_force_resume = 0;
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pm_runtime_enable(dev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_runtime_force_resume);
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