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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
16bool 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 */
33void 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 */
57void 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
70static bool suspend_device_irq(struct irq_desc *desc)
71{
72 unsigned long chipflags = irq_desc_get_chip(desc)->flags;
73 struct irq_data *irqd = &desc->irq_data;
74
75 if (!desc->action || irq_desc_is_chained(desc) ||
76 desc->no_suspend_depth)
77 return false;
78
79 if (irqd_is_wakeup_set(irqd)) {
80 irqd_set(irqd, IRQD_WAKEUP_ARMED);
81
82 if ((chipflags & IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND) &&
83 irqd_irq_disabled(irqd)) {
84 /*
85 * Interrupt marked for wakeup is in disabled state.
86 * Enable interrupt here to unmask/enable in irqchip
87 * to be able to resume with such interrupts.
88 */
89 __enable_irq(desc);
90 irqd_set(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
91 }
92 /*
93 * We return true here to force the caller to issue
94 * synchronize_irq(). We need to make sure that the
95 * IRQD_WAKEUP_ARMED is visible before we return from
96 * suspend_device_irqs().
97 */
98 return true;
99 }
100
101 desc->istate |= IRQS_SUSPENDED;
102 __disable_irq(desc);
103
104 /*
105 * Hardware which has no wakeup source configuration facility
106 * requires that the non wakeup interrupts are masked at the
107 * chip level. The chip implementation indicates that with
108 * IRQCHIP_MASK_ON_SUSPEND.
109 */
110 if (chipflags & IRQCHIP_MASK_ON_SUSPEND)
111 mask_irq(desc);
112 return true;
113}
114
115/**
116 * suspend_device_irqs - disable all currently enabled interrupt lines
117 *
118 * During system-wide suspend or hibernation device drivers need to be
119 * prevented from receiving interrupts and this function is provided
120 * for this purpose.
121 *
122 * So we disable all interrupts and mark them IRQS_SUSPENDED except
123 * for those which are unused, those which are marked as not
124 * suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
125 * set and those which are marked as active wakeup sources.
126 *
127 * The active wakeup sources are handled by the flow handler entry
128 * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
129 * interrupt and notifies the pm core about the wakeup.
130 */
131void suspend_device_irqs(void)
132{
133 struct irq_desc *desc;
134 int irq;
135
136 for_each_irq_desc(irq, desc) {
137 unsigned long flags;
138 bool sync;
139
140 if (irq_settings_is_nested_thread(desc))
141 continue;
142 raw_spin_lock_irqsave(&desc->lock, flags);
143 sync = suspend_device_irq(desc);
144 raw_spin_unlock_irqrestore(&desc->lock, flags);
145
146 if (sync)
147 synchronize_irq(irq);
148 }
149}
150
151static void resume_irq(struct irq_desc *desc)
152{
153 struct irq_data *irqd = &desc->irq_data;
154
155 irqd_clear(irqd, IRQD_WAKEUP_ARMED);
156
157 if (irqd_is_enabled_on_suspend(irqd)) {
158 /*
159 * Interrupt marked for wakeup was enabled during suspend
160 * entry. Disable such interrupts to restore them back to
161 * original state.
162 */
163 __disable_irq(desc);
164 irqd_clear(irqd, IRQD_IRQ_ENABLED_ON_SUSPEND);
165 }
166
167 if (desc->istate & IRQS_SUSPENDED)
168 goto resume;
169
170 /* Force resume the interrupt? */
171 if (!desc->force_resume_depth)
172 return;
173
174 /* Pretend that it got disabled ! */
175 desc->depth++;
176 irq_state_set_disabled(desc);
177 irq_state_set_masked(desc);
178resume:
179 desc->istate &= ~IRQS_SUSPENDED;
180 __enable_irq(desc);
181}
182
183static void resume_irqs(bool want_early)
184{
185 struct irq_desc *desc;
186 int irq;
187
188 for_each_irq_desc(irq, desc) {
189 unsigned long flags;
190 bool is_early = desc->action &&
191 desc->action->flags & IRQF_EARLY_RESUME;
192
193 if (!is_early && want_early)
194 continue;
195 if (irq_settings_is_nested_thread(desc))
196 continue;
197
198 raw_spin_lock_irqsave(&desc->lock, flags);
199 resume_irq(desc);
200 raw_spin_unlock_irqrestore(&desc->lock, flags);
201 }
202}
203
204/**
205 * rearm_wake_irq - rearm a wakeup interrupt line after signaling wakeup
206 * @irq: Interrupt to rearm
207 */
208void rearm_wake_irq(unsigned int irq)
209{
210 unsigned long flags;
211 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
212
213 if (!desc)
214 return;
215
216 if (!(desc->istate & IRQS_SUSPENDED) ||
217 !irqd_is_wakeup_set(&desc->irq_data))
218 goto unlock;
219
220 desc->istate &= ~IRQS_SUSPENDED;
221 irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
222 __enable_irq(desc);
223
224unlock:
225 irq_put_desc_busunlock(desc, flags);
226}
227
228/**
229 * irq_pm_syscore_resume - enable interrupt lines early
230 *
231 * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
232 */
233static void irq_pm_syscore_resume(void)
234{
235 resume_irqs(true);
236}
237
238static struct syscore_ops irq_pm_syscore_ops = {
239 .resume = irq_pm_syscore_resume,
240};
241
242static int __init irq_pm_init_ops(void)
243{
244 register_syscore_ops(&irq_pm_syscore_ops);
245 return 0;
246}
247
248device_initcall(irq_pm_init_ops);
249
250/**
251 * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
252 *
253 * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
254 * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
255 * set as well as those with %IRQF_FORCE_RESUME.
256 */
257void resume_device_irqs(void)
258{
259 resume_irqs(false);
260}
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
16bool 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 */
33void 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 */
57void 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
70static 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 */
117void 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}
136EXPORT_SYMBOL_GPL(suspend_device_irqs);
137
138static 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);
153resume:
154 desc->istate &= ~IRQS_SUSPENDED;
155 __enable_irq(desc);
156}
157
158static 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 * rearm_wake_irq - rearm a wakeup interrupt line after signaling wakeup
181 * @irq: Interrupt to rearm
182 */
183void rearm_wake_irq(unsigned int irq)
184{
185 unsigned long flags;
186 struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
187
188 if (!desc)
189 return;
190
191 if (!(desc->istate & IRQS_SUSPENDED) ||
192 !irqd_is_wakeup_set(&desc->irq_data))
193 goto unlock;
194
195 desc->istate &= ~IRQS_SUSPENDED;
196 irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
197 __enable_irq(desc);
198
199unlock:
200 irq_put_desc_busunlock(desc, flags);
201}
202
203/**
204 * irq_pm_syscore_ops - enable interrupt lines early
205 *
206 * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
207 */
208static void irq_pm_syscore_resume(void)
209{
210 resume_irqs(true);
211}
212
213static struct syscore_ops irq_pm_syscore_ops = {
214 .resume = irq_pm_syscore_resume,
215};
216
217static int __init irq_pm_init_ops(void)
218{
219 register_syscore_ops(&irq_pm_syscore_ops);
220 return 0;
221}
222
223device_initcall(irq_pm_init_ops);
224
225/**
226 * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
227 *
228 * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
229 * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
230 * set as well as those with %IRQF_FORCE_RESUME.
231 */
232void resume_device_irqs(void)
233{
234 resume_irqs(false);
235}
236EXPORT_SYMBOL_GPL(resume_device_irqs);