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TOMOYO Linux Cross Reference
Linux/kernel/irq/pm.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
  4  *
  5  * This file contains power management functions related to interrupts.
  6  */
  7 
  8 #include <linux/irq.h>
  9 #include <linux/module.h>
 10 #include <linux/interrupt.h>
 11 #include <linux/suspend.h>
 12 #include <linux/syscore_ops.h>
 13 
 14 #include "internals.h"
 15 
 16 bool irq_pm_check_wakeup(struct irq_desc *desc)
 17 {
 18         if (irqd_is_wakeup_armed(&desc->irq_data)) {
 19                 irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
 20                 desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
 21                 desc->depth++;
 22                 irq_disable(desc);
 23                 pm_system_irq_wakeup(irq_desc_get_irq(desc));
 24                 return true;
 25         }
 26         return false;
 27 }
 28 
 29 /*
 30  * Called from __setup_irq() with desc->lock held after @action has
 31  * been installed in the action chain.
 32  */
 33 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action)
 34 {
 35         desc->nr_actions++;
 36 
 37         if (action->flags & IRQF_FORCE_RESUME)
 38                 desc->force_resume_depth++;
 39 
 40         WARN_ON_ONCE(desc->force_resume_depth &&
 41                      desc->force_resume_depth != desc->nr_actions);
 42 
 43         if (action->flags & IRQF_NO_SUSPEND)
 44                 desc->no_suspend_depth++;
 45         else if (action->flags & IRQF_COND_SUSPEND)
 46                 desc->cond_suspend_depth++;
 47 
 48         WARN_ON_ONCE(desc->no_suspend_depth &&
 49                      (desc->no_suspend_depth +
 50                         desc->cond_suspend_depth) != desc->nr_actions);
 51 }
 52 
 53 /*
 54  * Called from __free_irq() with desc->lock held after @action has
 55  * been removed from the action chain.
 56  */
 57 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action)
 58 {
 59         desc->nr_actions--;
 60 
 61         if (action->flags & IRQF_FORCE_RESUME)
 62                 desc->force_resume_depth--;
 63 
 64         if (action->flags & IRQF_NO_SUSPEND)
 65                 desc->no_suspend_depth--;
 66         else if (action->flags & IRQF_COND_SUSPEND)
 67                 desc->cond_suspend_depth--;
 68 }
 69 
 70 static bool suspend_device_irq(struct irq_desc *desc)
 71 {
 72         if (!desc->action || irq_desc_is_chained(desc) ||
 73             desc->no_suspend_depth)
 74                 return false;
 75 
 76         if (irqd_is_wakeup_set(&desc->irq_data)) {
 77                 irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
 78                 /*
 79                  * We return true here to force the caller to issue
 80                  * synchronize_irq(). We need to make sure that the
 81                  * IRQD_WAKEUP_ARMED is visible before we return from
 82                  * suspend_device_irqs().
 83                  */
 84                 return true;
 85         }
 86 
 87         desc->istate |= IRQS_SUSPENDED;
 88         __disable_irq(desc);
 89 
 90         /*
 91          * Hardware which has no wakeup source configuration facility
 92          * requires that the non wakeup interrupts are masked at the
 93          * chip level. The chip implementation indicates that with
 94          * IRQCHIP_MASK_ON_SUSPEND.
 95          */
 96         if (irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
 97                 mask_irq(desc);
 98         return true;
 99 }
100 
101 /**
102  * suspend_device_irqs - disable all currently enabled interrupt lines
103  *
104  * During system-wide suspend or hibernation device drivers need to be
105  * prevented from receiving interrupts and this function is provided
106  * for this purpose.
107  *
108  * So we disable all interrupts and mark them IRQS_SUSPENDED except
109  * for those which are unused, those which are marked as not
110  * suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
111  * set and those which are marked as active wakeup sources.
112  *
113  * The active wakeup sources are handled by the flow handler entry
114  * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
115  * interrupt and notifies the pm core about the wakeup.
116  */
117 void suspend_device_irqs(void)
118 {
119         struct irq_desc *desc;
120         int irq;
121 
122         for_each_irq_desc(irq, desc) {
123                 unsigned long flags;
124                 bool sync;
125 
126                 if (irq_settings_is_nested_thread(desc))
127                         continue;
128                 raw_spin_lock_irqsave(&desc->lock, flags);
129                 sync = suspend_device_irq(desc);
130                 raw_spin_unlock_irqrestore(&desc->lock, flags);
131 
132                 if (sync)
133                         synchronize_irq(irq);
134         }
135 }
136 EXPORT_SYMBOL_GPL(suspend_device_irqs);
137 
138 static void resume_irq(struct irq_desc *desc)
139 {
140         irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
141 
142         if (desc->istate & IRQS_SUSPENDED)
143                 goto resume;
144 
145         /* Force resume the interrupt? */
146         if (!desc->force_resume_depth)
147                 return;
148 
149         /* Pretend that it got disabled ! */
150         desc->depth++;
151         irq_state_set_disabled(desc);
152         irq_state_set_masked(desc);
153 resume:
154         desc->istate &= ~IRQS_SUSPENDED;
155         __enable_irq(desc);
156 }
157 
158 static void resume_irqs(bool want_early)
159 {
160         struct irq_desc *desc;
161         int irq;
162 
163         for_each_irq_desc(irq, desc) {
164                 unsigned long flags;
165                 bool is_early = desc->action &&
166                         desc->action->flags & IRQF_EARLY_RESUME;
167 
168                 if (!is_early && want_early)
169                         continue;
170                 if (irq_settings_is_nested_thread(desc))
171                         continue;
172 
173                 raw_spin_lock_irqsave(&desc->lock, flags);
174                 resume_irq(desc);
175                 raw_spin_unlock_irqrestore(&desc->lock, flags);
176         }
177 }
178 
179 /**
180  * irq_pm_syscore_ops - enable interrupt lines early
181  *
182  * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
183  */
184 static void irq_pm_syscore_resume(void)
185 {
186         resume_irqs(true);
187 }
188 
189 static struct syscore_ops irq_pm_syscore_ops = {
190         .resume         = irq_pm_syscore_resume,
191 };
192 
193 static int __init irq_pm_init_ops(void)
194 {
195         register_syscore_ops(&irq_pm_syscore_ops);
196         return 0;
197 }
198 
199 device_initcall(irq_pm_init_ops);
200 
201 /**
202  * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
203  *
204  * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
205  * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
206  * set as well as those with %IRQF_FORCE_RESUME.
207  */
208 void resume_device_irqs(void)
209 {
210         resume_irqs(false);
211 }
212 EXPORT_SYMBOL_GPL(resume_device_irqs);
213 

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