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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/kernel/power/suspend.c
....@@ -1,11 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * kernel/power/suspend.c - Suspend to RAM and standby functionality.
34  *
45  * Copyright (c) 2003 Patrick Mochel
56  * Copyright (c) 2003 Open Source Development Lab
67  * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
7
- *
8
- * This file is released under the GPLv2.
98  */
109 
1110 #define pr_fmt(fmt) "PM: " fmt
....@@ -17,7 +16,6 @@
1716 #include <linux/console.h>
1817 #include <linux/cpu.h>
1918 #include <linux/cpuidle.h>
20
-#include <linux/syscalls.h>
2119 #include <linux/gfp.h>
2220 #include <linux/io.h>
2321 #include <linux/kernel.h>
....@@ -46,8 +44,6 @@
4644 	[PM_SUSPEND_TO_IDLE] = "s2idle",
4745 	[PM_SUSPEND_STANDBY] = "shallow",
4846 	[PM_SUSPEND_MEM] = "deep",
49
-	[PM_SUSPEND_MEM_LITE] = "lite",
50
-	[PM_SUSPEND_MEM_ULTRA] = "ultra",
5147 };
5248 const char *mem_sleep_states[PM_SUSPEND_MAX];
5349 
....@@ -66,11 +62,17 @@
6662 enum s2idle_states __read_mostly s2idle_state;
6763 static DEFINE_RAW_SPINLOCK(s2idle_lock);
6864 
69
-bool pm_suspend_via_s2idle(void)
65
+/**
66
+ * pm_suspend_default_s2idle - Check if suspend-to-idle is the default suspend.
67
+ *
68
+ * Return 'true' if suspend-to-idle has been selected as the default system
69
+ * suspend method.
70
+ */
71
+bool pm_suspend_default_s2idle(void)
7072 {
7173 	return mem_sleep_current == PM_SUSPEND_TO_IDLE;
7274 }
73
-EXPORT_SYMBOL_GPL(pm_suspend_via_s2idle);
75
+EXPORT_SYMBOL_GPL(pm_suspend_default_s2idle);
7476 
7577 void s2idle_set_ops(const struct platform_s2idle_ops *ops)
7678 {
....@@ -78,7 +80,6 @@
7880 	s2idle_ops = ops;
7981 	unlock_system_sleep();
8082 }
81
-EXPORT_SYMBOL_GPL(s2idle_set_ops);
8283 
8384 static void s2idle_begin(void)
8485 {
....@@ -121,44 +122,25 @@
121122 {
122123 	pm_pr_dbg("suspend-to-idle\n");
123124 
125
+	/*
126
+	 * Suspend-to-idle equals:
127
+	 * frozen processes + suspended devices + idle processors.
128
+	 * Thus s2idle_enter() should be called right after all devices have
129
+	 * been suspended.
130
+	 *
131
+	 * Wakeups during the noirq suspend of devices may be spurious, so try
132
+	 * to avoid them upfront.
133
+	 */
124134 	for (;;) {
125
-		int error;
126
-
127
-		dpm_noirq_begin();
128
-
129
-		/*
130
-		 * Suspend-to-idle equals
131
-		 * frozen processes + suspended devices + idle processors.
132
-		 * Thus s2idle_enter() should be called right after
133
-		 * all devices have been suspended.
134
-		 *
135
-		 * Wakeups during the noirq suspend of devices may be spurious,
136
-		 * so prevent them from terminating the loop right away.
137
-		 */
138
-		error = dpm_noirq_suspend_devices(PMSG_SUSPEND);
139
-		if (!error)
140
-			s2idle_enter();
141
-		else if (error == -EBUSY && pm_wakeup_pending())
142
-			error = 0;
143
-
144
-		if (!error && s2idle_ops && s2idle_ops->wake)
145
-			s2idle_ops->wake();
146
-
147
-		dpm_noirq_resume_devices(PMSG_RESUME);
148
-
149
-		dpm_noirq_end();
150
-
151
-		if (error)
135
+		if (s2idle_ops && s2idle_ops->wake) {
136
+			if (s2idle_ops->wake())
137
+				break;
138
+		} else if (pm_wakeup_pending()) {
152139 			break;
140
+		}
153141 
154
-		if (s2idle_ops && s2idle_ops->sync)
155
-			s2idle_ops->sync();
156
-
157
-		if (pm_wakeup_pending())
158
-			break;
159
-
160
-		pm_wakeup_clear(false);
161142 		clear_wakeup_reasons();
143
+		s2idle_enter();
162144 	}
163145 
164146 	pm_pr_dbg("resume from suspend-to-idle\n");
....@@ -232,8 +214,6 @@
232214 	}
233215 	if (valid_state(PM_SUSPEND_MEM)) {
234216 		mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM];
235
-		mem_sleep_states[PM_SUSPEND_MEM_LITE] = mem_sleep_labels[PM_SUSPEND_MEM_LITE];
236
-		mem_sleep_states[PM_SUSPEND_MEM_ULTRA] = mem_sleep_labels[PM_SUSPEND_MEM_ULTRA];
237217 		if (mem_sleep_default >= PM_SUSPEND_MEM)
238218 			mem_sleep_current = PM_SUSPEND_MEM;
239219 	}
....@@ -274,14 +254,21 @@
274254 
275255 static int platform_suspend_prepare_noirq(suspend_state_t state)
276256 {
277
-	return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare_late ?
278
-		suspend_ops->prepare_late() : 0;
257
+	if (state == PM_SUSPEND_TO_IDLE)
258
+		return s2idle_ops && s2idle_ops->prepare_late ?
259
+			s2idle_ops->prepare_late() : 0;
260
+
261
+	return suspend_ops->prepare_late ? suspend_ops->prepare_late() : 0;
279262 }
280263 
281264 static void platform_resume_noirq(suspend_state_t state)
282265 {
283
-	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->wake)
266
+	if (state == PM_SUSPEND_TO_IDLE) {
267
+		if (s2idle_ops && s2idle_ops->restore_early)
268
+			s2idle_ops->restore_early();
269
+	} else if (suspend_ops->wake) {
284270 		suspend_ops->wake();
271
+	}
285272 }
286273 
287274 static void platform_resume_early(suspend_state_t state)
....@@ -355,18 +342,16 @@
355342  */
356343 static int suspend_prepare(suspend_state_t state)
357344 {
358
-	int error, nr_calls = 0;
345
+	int error;
359346 
360347 	if (!sleep_state_supported(state))
361348 		return -EPERM;
362349 
363350 	pm_prepare_console();
364351 
365
-	error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls);
366
-	if (error) {
367
-		nr_calls--;
368
-		goto Finish;
369
-	}
352
+	error = pm_notifier_call_chain_robust(PM_SUSPEND_PREPARE, PM_POST_SUSPEND);
353
+	if (error)
354
+		goto Restore;
370355 
371356 	trace_suspend_resume(TPS("freeze_processes"), 0, true);
372357 	error = suspend_freeze_processes();
....@@ -377,8 +362,8 @@
377362 	log_suspend_abort_reason("One or more tasks refusing to freeze");
378363 	suspend_stats.failed_freeze++;
379364 	dpm_save_failed_step(SUSPEND_FREEZE);
380
- Finish:
381
-	__pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL);
365
+	pm_notifier_call_chain(PM_POST_SUSPEND);
366
+ Restore:
382367 	pm_restore_console();
383368 	return error;
384369 }
....@@ -423,11 +408,6 @@
423408 	if (error)
424409 		goto Devices_early_resume;
425410 
426
-	if (state == PM_SUSPEND_TO_IDLE && pm_test_level != TEST_PLATFORM) {
427
-		s2idle_loop();
428
-		goto Platform_early_resume;
429
-	}
430
-
431411 	error = dpm_suspend_noirq(PMSG_SUSPEND);
432412 	if (error) {
433413 		last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
....@@ -444,7 +424,12 @@
444424 	if (suspend_test(TEST_PLATFORM))
445425 		goto Platform_wake;
446426 
447
-	error = disable_nonboot_cpus();
427
+	if (state == PM_SUSPEND_TO_IDLE) {
428
+		s2idle_loop();
429
+		goto Platform_wake;
430
+	}
431
+
432
+	error = suspend_disable_secondary_cpus();
448433 	if (error || suspend_test(TEST_CPUS)) {
449434 		log_suspend_abort_reason("Disabling non-boot cpus failed");
450435 		goto Enable_cpus;
....@@ -476,7 +461,7 @@
476461 	BUG_ON(irqs_disabled());
477462 
478463  Enable_cpus:
479
-	enable_nonboot_cpus();
464
+	suspend_enable_secondary_cpus();
480465 
481466  Platform_wake:
482467 	platform_resume_noirq(state);
....@@ -506,6 +491,9 @@
506491 		return -ENOSYS;
507492 
508493 	pm_suspend_target_state = state;
494
+
495
+	if (state == PM_SUSPEND_TO_IDLE)
496
+		pm_set_suspend_no_platform();
509497 
510498 	error = platform_suspend_begin(state);
511499 	if (error)
....@@ -588,13 +576,11 @@
588576 	if (state == PM_SUSPEND_TO_IDLE)
589577 		s2idle_begin();
590578 
591
-#ifndef CONFIG_SUSPEND_SKIP_SYNC
592
-	trace_suspend_resume(TPS("sync_filesystems"), 0, true);
593
-	pr_info("Syncing filesystems ... ");
594
-	ksys_sync();
595
-	pr_cont("done.\n");
596
-	trace_suspend_resume(TPS("sync_filesystems"), 0, false);
597
-#endif
579
+	if (sync_on_suspend_enabled) {
580
+		trace_suspend_resume(TPS("sync_filesystems"), 0, true);
581
+		ksys_sync_helper();
582
+		trace_suspend_resume(TPS("sync_filesystems"), 0, false);
583
+	}
598584 
599585 	pm_pr_dbg("Preparing system for sleep (%s)\n", mem_sleep_labels[state]);
600586 	pm_suspend_clear_flags();
....@@ -635,10 +621,6 @@
635621 		return -EINVAL;
636622 
637623 	pr_info("suspend entry (%s)\n", mem_sleep_labels[state]);
638
-
639
-	if (state == PM_SUSPEND_MEM_LITE || state == PM_SUSPEND_MEM_ULTRA)
640
-		state = PM_SUSPEND_MEM;
641
-
642624 	error = enter_state(state);
643625 	if (error) {
644626 		suspend_stats.fail++;