From 068765ba7987e73d4381edfe47b70aa121c7155c Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 1 Sep 2014 13:47:49 +0200 Subject: PM / sleep: Mechanism for aborting system suspends unconditionally It sometimes may be necessary to abort a system suspend in progress or wake up the system from suspend-to-idle even if the pm_wakeup_event()/pm_stay_awake() mechanism is not enabled. For this purpose, introduce a new global variable pm_abort_suspend and make pm_wakeup_pending() check its value. Also add routines for manipulating that variable. Signed-off-by: Rafael J. Wysocki --- include/linux/suspend.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 519064e0c943..06a9910827c2 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -371,6 +371,8 @@ extern int unregister_pm_notifier(struct notifier_block *nb); extern bool events_check_enabled; extern bool pm_wakeup_pending(void); +extern void pm_system_wakeup(void); +extern void pm_wakeup_clear(void); extern bool pm_get_wakeup_count(unsigned int *count, bool block); extern bool pm_save_wakeup_count(unsigned int count); extern void pm_wakep_autosleep_enabled(bool set); @@ -418,6 +420,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) #define pm_notifier(fn, pri) do { (void)(fn); } while (0) static inline bool pm_wakeup_pending(void) { return false; } +static inline void pm_system_wakeup(void) {} +static inline void pm_wakeup_clear(void) {} static inline void lock_system_sleep(void) {} static inline void unlock_system_sleep(void) {} -- cgit v1.2.3 From cab303be91dc47942bc25de33dc1140123540800 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 28 Aug 2014 11:44:31 +0200 Subject: genirq: Add sanity checks for PM options on shared interrupt lines Account the IRQF_NO_SUSPEND and IRQF_RESUME_EARLY actions on shared interrupt lines and yell loudly if there is a mismatch. Signed-off-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki --- include/linux/irqdesc.h | 10 ++++++++++ kernel/irq/internals.h | 10 ++++++++++ kernel/irq/manage.c | 4 ++++ kernel/irq/pm.c | 36 ++++++++++++++++++++++++++++++++++++ 4 files changed, 60 insertions(+) (limited to 'include/linux') diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index 472c021a2d4f..cb1a31e448ae 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -36,6 +36,11 @@ struct irq_desc; * @threads_oneshot: bitfield to handle shared oneshot threads * @threads_active: number of irqaction threads currently running * @wait_for_threads: wait queue for sync_irq to wait for threaded handlers + * @nr_actions: number of installed actions on this descriptor + * @no_suspend_depth: number of irqactions on a irq descriptor with + * IRQF_NO_SUSPEND set + * @force_resume_depth: number of irqactions on a irq descriptor with + * IRQF_FORCE_RESUME set * @dir: /proc/irq/ procfs entry * @name: flow handler name for /proc/interrupts output */ @@ -68,6 +73,11 @@ struct irq_desc { unsigned long threads_oneshot; atomic_t threads_active; wait_queue_head_t wait_for_threads; +#ifdef CONFIG_PM_SLEEP + unsigned int nr_actions; + unsigned int no_suspend_depth; + unsigned int force_resume_depth; +#endif #ifdef CONFIG_PROC_FS struct proc_dir_entry *dir; #endif diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index af2821178900..c402502a5111 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -194,3 +194,13 @@ static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *d __this_cpu_inc(*desc->kstat_irqs); __this_cpu_inc(kstat.irqs_sum); } + +#ifdef CONFIG_PM_SLEEP +void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); +void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); +#else +static inline void +irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } +static inline void +irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) { } +#endif diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index fa564e8db996..0a9104b4608b 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1200,6 +1200,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) new->irq = irq; *old_ptr = new; + irq_pm_install_action(desc, new); + /* Reset broken irq detection when installing new handler */ desc->irq_count = 0; desc->irqs_unhandled = 0; @@ -1318,6 +1320,8 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) /* Found it - now remove it from the list of entries: */ *action_ptr = action->next; + irq_pm_remove_action(desc, action); + /* If this was the last handler, shut down the IRQ line: */ if (!desc->action) { irq_shutdown(desc); diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index b84141dcee5e..1b1b67a73218 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -13,6 +13,42 @@ #include "internals.h" +/* + * Called from __setup_irq() with desc->lock held after @action has + * been installed in the action chain. + */ +void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) +{ + desc->nr_actions++; + + if (action->flags & IRQF_FORCE_RESUME) + desc->force_resume_depth++; + + WARN_ON_ONCE(desc->force_resume_depth && + desc->force_resume_depth != desc->nr_actions); + + if (action->flags & IRQF_NO_SUSPEND) + desc->no_suspend_depth++; + + WARN_ON_ONCE(desc->no_suspend_depth && + desc->no_suspend_depth != desc->nr_actions); +} + +/* + * Called from __free_irq() with desc->lock held after @action has + * been removed from the action chain. + */ +void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action) +{ + desc->nr_actions--; + + if (action->flags & IRQF_FORCE_RESUME) + desc->force_resume_depth--; + + if (action->flags & IRQF_NO_SUSPEND) + desc->no_suspend_depth--; +} + static void suspend_device_irq(struct irq_desc *desc, int irq) { if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND)) -- cgit v1.2.3 From b76f16748fa61801b1a1fd3ffb6f25ee228a35e0 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 29 Aug 2014 13:54:09 +0200 Subject: genirq: Mark wakeup sources as armed on suspend This allows us to utilize this information in the irq_may_run() check without adding another conditional to the fast path. Signed-off-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki --- include/linux/irq.h | 8 ++++++++ kernel/irq/pm.c | 5 +++++ 2 files changed, 13 insertions(+) (limited to 'include/linux') diff --git a/include/linux/irq.h b/include/linux/irq.h index 62af59242ddc..03f48d936f66 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -173,6 +173,7 @@ struct irq_data { * IRQD_IRQ_DISABLED - Disabled state of the interrupt * IRQD_IRQ_MASKED - Masked state of the interrupt * IRQD_IRQ_INPROGRESS - In progress state of the interrupt + * IRQD_WAKEUP_ARMED - Wakeup mode armed */ enum { IRQD_TRIGGER_MASK = 0xf, @@ -186,6 +187,7 @@ enum { IRQD_IRQ_DISABLED = (1 << 16), IRQD_IRQ_MASKED = (1 << 17), IRQD_IRQ_INPROGRESS = (1 << 18), + IRQD_WAKEUP_ARMED = (1 << 19), }; static inline bool irqd_is_setaffinity_pending(struct irq_data *d) @@ -257,6 +259,12 @@ static inline bool irqd_irq_inprogress(struct irq_data *d) return d->state_use_accessors & IRQD_IRQ_INPROGRESS; } +static inline bool irqd_is_wakeup_armed(struct irq_data *d) +{ + return d->state_use_accessors & IRQD_WAKEUP_ARMED; +} + + /* * Functions for chained handlers which can be enabled/disabled by the * standard disable_irq/enable_irq calls. Must be called with diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index cf0ce0163db9..766930eaeed9 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -54,6 +54,9 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq) if (!desc->action || desc->no_suspend_depth) return false; + if (irqd_is_wakeup_set(&desc->irq_data)) + irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED); + desc->istate |= IRQS_SUSPENDED; __disable_irq(desc, irq); @@ -101,6 +104,8 @@ EXPORT_SYMBOL_GPL(suspend_device_irqs); static void resume_irq(struct irq_desc *desc, int irq) { + irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED); + if (desc->istate & IRQS_SUSPENDED) goto resume; -- cgit v1.2.3 From 9ce7a25849e80cfb264f4995f832b932c1987e1a Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 29 Aug 2014 14:00:16 +0200 Subject: genirq: Simplify wakeup mechanism Currently we suspend wakeup interrupts by lazy disabling them and check later whether the interrupt has fired, but that's not sufficient for suspend to idle as there is no way to check that once we transitioned into the CPU idle state. So we change the mechanism in the following way: 1) Leave the wakeup interrupts enabled across suspend 2) Add a check to irq_may_run() which is called at the beginning of each flow handler whether the interrupt is an armed wakeup source. This check is basically free as it just extends the existing check for IRQD_IRQ_INPROGRESS. So no new conditional in the hot path. If the IRQD_WAKEUP_ARMED flag is set, then the interrupt is disabled, marked as pending/suspended and the pm core is notified about the wakeup event. Signed-off-by: Thomas Gleixner [ rjw: syscore.c and put irq_pm_check_wakeup() into pm.c ] Signed-off-by: Rafael J. Wysocki --- drivers/base/syscore.c | 7 +++--- include/linux/interrupt.h | 5 ----- kernel/irq/chip.c | 20 ++++++++++++++++- kernel/irq/internals.h | 2 ++ kernel/irq/pm.c | 55 +++++++++++++++++++++++++---------------------- 5 files changed, 53 insertions(+), 36 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c index dbb8350ea8dc..8d98a329f6ea 100644 --- a/drivers/base/syscore.c +++ b/drivers/base/syscore.c @@ -9,7 +9,7 @@ #include #include #include -#include +#include #include static LIST_HEAD(syscore_ops_list); @@ -54,9 +54,8 @@ int syscore_suspend(void) pr_debug("Checking wakeup interrupts\n"); /* Return error code if there are any wakeup interrupts pending. */ - ret = check_wakeup_irqs(); - if (ret) - return ret; + if (pm_wakeup_pending()) + return -EBUSY; WARN_ONCE(!irqs_disabled(), "Interrupts enabled before system core suspend.\n"); diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 698ad053d064..69517a24bc50 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -193,11 +193,6 @@ extern void irq_wake_thread(unsigned int irq, void *dev_id); /* The following three functions are for the core kernel use only. */ extern void suspend_device_irqs(void); extern void resume_device_irqs(void); -#ifdef CONFIG_PM_SLEEP -extern int check_wakeup_irqs(void); -#else -static inline int check_wakeup_irqs(void) { return 0; } -#endif /** * struct irq_affinity_notify - context for notification of IRQ affinity changes diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 6baf86085571..e7917ff8a486 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -344,8 +344,26 @@ static bool irq_check_poll(struct irq_desc *desc) static bool irq_may_run(struct irq_desc *desc) { - if (!irqd_irq_inprogress(&desc->irq_data)) + unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED; + + /* + * If the interrupt is not in progress and is not an armed + * wakeup interrupt, proceed. + */ + if (!irqd_has_set(&desc->irq_data, mask)) return true; + + /* + * If the interrupt is an armed wakeup source, mark it pending + * and suspended, disable it and notify the pm core about the + * event. + */ + if (irq_pm_check_wakeup(desc)) + return false; + + /* + * Handle a potential concurrent poll on a different core. + */ return irq_check_poll(desc); } diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index c402502a5111..4332d766619d 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -196,9 +196,11 @@ static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *d } #ifdef CONFIG_PM_SLEEP +bool irq_pm_check_wakeup(struct irq_desc *desc); void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action); void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action); #else +static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; } static inline void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { } static inline void diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index 766930eaeed9..3ca532592704 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -9,10 +9,24 @@ #include #include #include +#include #include #include "internals.h" +bool irq_pm_check_wakeup(struct irq_desc *desc) +{ + if (irqd_is_wakeup_armed(&desc->irq_data)) { + irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED); + desc->istate |= IRQS_SUSPENDED | IRQS_PENDING; + desc->depth++; + irq_disable(desc); + pm_system_wakeup(); + return true; + } + return false; +} + /* * Called from __setup_irq() with desc->lock held after @action has * been installed in the action chain. @@ -54,8 +68,16 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq) if (!desc->action || desc->no_suspend_depth) return false; - if (irqd_is_wakeup_set(&desc->irq_data)) + if (irqd_is_wakeup_set(&desc->irq_data)) { irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED); + /* + * We return true here to force the caller to issue + * synchronize_irq(). We need to make sure that the + * IRQD_WAKEUP_ARMED is visible before we return from + * suspend_device_irqs(). + */ + return true; + } desc->istate |= IRQS_SUSPENDED; __disable_irq(desc, irq); @@ -79,9 +101,13 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq) * for this purpose. * * So we disable all interrupts and mark them IRQS_SUSPENDED except - * for those which are unused and those which are marked as not + * for those which are unused, those which are marked as not * suspendable via an interrupt request with the flag IRQF_NO_SUSPEND - * set. + * set and those which are marked as active wakeup sources. + * + * The active wakeup sources are handled by the flow handler entry + * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the + * interrupt and notifies the pm core about the wakeup. */ void suspend_device_irqs(void) { @@ -173,26 +199,3 @@ void resume_device_irqs(void) resume_irqs(false); } EXPORT_SYMBOL_GPL(resume_device_irqs); - -/** - * check_wakeup_irqs - check if any wake-up interrupts are pending - */ -int check_wakeup_irqs(void) -{ - struct irq_desc *desc; - int irq; - - for_each_irq_desc(irq, desc) { - /* - * Only interrupts which are marked as wakeup source - * and have not been disabled before the suspend check - * can abort suspend. - */ - if (irqd_is_wakeup_set(&desc->irq_data)) { - if (desc->depth == 1 && desc->istate & IRQS_PENDING) - return -EBUSY; - } - } - - return 0; -} -- cgit v1.2.3