bc17c02a85
Add API log_wakeup_reason() and expose it to userspace via sysfs path /sys/kernel/wakeup_reasons/last_resume_reason Bug: 120445600 Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com> [AmitP: Folded following android-4.9 commit changes into this patch 1135122a192a ("ANDROID: POWER: fix compile warnings in log_wakeup_reason") b4e6247778b0 ("ANDROID: Power: Changes the permission to read only for sysfs file /sys/kernel/wakeup_reasons/last_resume_reason") e13dbc7c69cd ("ANDROID: power: wakeup_reason: rename irq_count to irqcount")] Signed-off-by: Amit Pundir <amit.pundir@linaro.org> [astrachan: Folded the following changes into this patch: 39d7c7fe91c0 ("ANDROID: power: wakeup_reason: Add guard condition for maximum wakeup reasons") 0730434bdf49 ("ANDROID: power: wakeup_reason: Avoids bogus error messages for the suspend aborts.") 4e42dceae54e ("ANDROID: power: wakeup_reason: Adds functionality to log the last suspend abort reason.") f21313b70ac7 ("ANDROID: power: wakeup_reason: Report suspend times from last_suspend_time") f97ec34442ac ("ANDROID: power: wakeup_reason: fix suspend time reporting") cd92df73e504 ("ANDROID: power: wakeup: Add last wake up source logging for suspend abort reason.") 546b6ae3c087 ("ANDROID: power: wakeup: Add the guard condition for len in pm_get_active_wakeup_sources") 1453d9ffcdbe ("ANDROID: power: wakeup_reason: make logging work in an interrupt context.")] Change-Id: I81addaf420f1338255c5d0638b0d244a99d777d1 Signed-off-by: Alistair Strachan <astrachan@google.com>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* syscore.c - Execution of system core operations.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*/
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#include <linux/syscore_ops.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <trace/events/power.h>
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#include <linux/wakeup_reason.h>
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static LIST_HEAD(syscore_ops_list);
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static DEFINE_MUTEX(syscore_ops_lock);
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/**
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* register_syscore_ops - Register a set of system core operations.
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* @ops: System core operations to register.
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*/
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void register_syscore_ops(struct syscore_ops *ops)
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{
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mutex_lock(&syscore_ops_lock);
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list_add_tail(&ops->node, &syscore_ops_list);
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mutex_unlock(&syscore_ops_lock);
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}
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EXPORT_SYMBOL_GPL(register_syscore_ops);
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/**
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* unregister_syscore_ops - Unregister a set of system core operations.
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* @ops: System core operations to unregister.
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*/
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void unregister_syscore_ops(struct syscore_ops *ops)
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{
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mutex_lock(&syscore_ops_lock);
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list_del(&ops->node);
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mutex_unlock(&syscore_ops_lock);
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}
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EXPORT_SYMBOL_GPL(unregister_syscore_ops);
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#ifdef CONFIG_PM_SLEEP
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/**
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* syscore_suspend - Execute all the registered system core suspend callbacks.
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*
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* This function is executed with one CPU on-line and disabled interrupts.
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*/
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int syscore_suspend(void)
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{
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struct syscore_ops *ops;
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int ret = 0;
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trace_suspend_resume(TPS("syscore_suspend"), 0, true);
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pr_debug("Checking wakeup interrupts\n");
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/* Return error code if there are any wakeup interrupts pending. */
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if (pm_wakeup_pending())
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return -EBUSY;
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled before system core suspend.\n");
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list_for_each_entry_reverse(ops, &syscore_ops_list, node)
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if (ops->suspend) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->suspend);
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ret = ops->suspend();
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if (ret)
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goto err_out;
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled after %pF\n", ops->suspend);
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}
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trace_suspend_resume(TPS("syscore_suspend"), 0, false);
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return 0;
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err_out:
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log_suspend_abort_reason("System core suspend callback %pF failed",
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ops->suspend);
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pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
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list_for_each_entry_continue(ops, &syscore_ops_list, node)
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if (ops->resume)
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ops->resume();
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return ret;
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}
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EXPORT_SYMBOL_GPL(syscore_suspend);
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/**
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* syscore_resume - Execute all the registered system core resume callbacks.
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*
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* This function is executed with one CPU on-line and disabled interrupts.
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*/
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void syscore_resume(void)
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{
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struct syscore_ops *ops;
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trace_suspend_resume(TPS("syscore_resume"), 0, true);
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled before system core resume.\n");
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list_for_each_entry(ops, &syscore_ops_list, node)
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if (ops->resume) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->resume);
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ops->resume();
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WARN_ONCE(!irqs_disabled(),
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"Interrupts enabled after %pF\n", ops->resume);
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}
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trace_suspend_resume(TPS("syscore_resume"), 0, false);
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}
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EXPORT_SYMBOL_GPL(syscore_resume);
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#endif /* CONFIG_PM_SLEEP */
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/**
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* syscore_shutdown - Execute all the registered system core shutdown callbacks.
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*/
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void syscore_shutdown(void)
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{
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struct syscore_ops *ops;
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mutex_lock(&syscore_ops_lock);
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list_for_each_entry_reverse(ops, &syscore_ops_list, node)
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if (ops->shutdown) {
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if (initcall_debug)
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pr_info("PM: Calling %pF\n", ops->shutdown);
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ops->shutdown();
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}
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mutex_unlock(&syscore_ops_lock);
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}
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