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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/acpi/sleep.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * sleep.c - ACPI sleep support.
34  *
....@@ -5,9 +6,6 @@
56  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
67  * Copyright (c) 2000-2003 Patrick Mochel
78  * Copyright (c) 2003 Open Source Development Lab
8
- *
9
- * This file is released under the GPLv2.
10
- *
119  */
1210 
1311 #include <linux/delay.h>
....@@ -63,8 +61,11 @@
6361 static int acpi_sleep_prepare(u32 acpi_state)
6462 {
6563 #ifdef CONFIG_ACPI_SLEEP
64
+	unsigned long acpi_wakeup_address;
65
+
6666 	/* do we have a wakeup address for S2 and S3? */
6767 	if (acpi_state == ACPI_STATE_S3) {
68
+		acpi_wakeup_address = acpi_get_wakeup_address();
6869 		if (!acpi_wakeup_address)
6970 			return -EFAULT;
7071 		acpi_set_waking_vector(acpi_wakeup_address);
....@@ -79,7 +80,7 @@
7980 	return 0;
8081 }
8182 
82
-static bool acpi_sleep_state_supported(u8 sleep_state)
83
+bool acpi_sleep_state_supported(u8 sleep_state)
8384 {
8485 	acpi_status status;
8586 	u8 type_a, type_b;
....@@ -91,6 +92,10 @@
9192 }
9293 
9394 #ifdef CONFIG_ACPI_SLEEP
95
+static bool sleep_no_lps0 __read_mostly;
96
+module_param(sleep_no_lps0, bool, 0644);
97
+MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
98
+
9499 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
95100 
96101 u32 acpi_target_system_state(void)
....@@ -160,11 +165,11 @@
160165 	return 0;
161166 }
162167 
163
-static bool acpi_sleep_no_lps0;
168
+static bool acpi_sleep_default_s3;
164169 
165
-static int __init init_no_lps0(const struct dmi_system_id *d)
170
+static int __init init_default_s3(const struct dmi_system_id *d)
166171 {
167
-	acpi_sleep_no_lps0 = true;
172
+	acpi_sleep_default_s3 = true;
168173 	return 0;
169174 }
170175 
....@@ -359,17 +364,12 @@
359364 		DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
360365 		},
361366 	},
362
-	/*
363
-	 * https://bugzilla.kernel.org/show_bug.cgi?id=196907
364
-	 * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
365
-	 * S0 Idle firmware interface.
366
-	 */
367367 	{
368
-	.callback = init_no_lps0,
369
-	.ident = "Dell XPS13 9360",
368
+	.callback = init_nvs_save_s3,
369
+	.ident = "Lenovo G40-45",
370370 	.matches = {
371
-		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
372
-		DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
371
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
372
+		DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
373373 		},
374374 	},
375375 	/*
....@@ -378,11 +378,23 @@
378378 	 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
379379 	 */
380380 	{
381
-	.callback = init_no_lps0,
381
+	.callback = init_default_s3,
382382 	.ident = "ThinkPad X1 Tablet(2016)",
383383 	.matches = {
384384 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
385385 		DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
386
+		},
387
+	},
388
+	/*
389
+	 * ASUS B1400CEAE hangs on resume from suspend (see
390
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=215742).
391
+	 */
392
+	{
393
+	.callback = init_default_s3,
394
+	.ident = "ASUS B1400CEAE",
395
+	.matches = {
396
+		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
397
+		DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"),
386398 		},
387399 	},
388400 	{},
....@@ -454,14 +466,6 @@
454466 	return error;
455467 }
456468 
457
-static int find_powerf_dev(struct device *dev, void *data)
458
-{
459
-	struct acpi_device *device = to_acpi_device(dev);
460
-	const char *hid = acpi_device_hid(device);
461
-
462
-	return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
463
-}
464
-
465469 /**
466470  *	acpi_pm_finish - Instruct the platform to leave a sleep state.
467471  *
....@@ -470,7 +474,7 @@
470474  */
471475 static void acpi_pm_finish(void)
472476 {
473
-	struct device *pwr_btn_dev;
477
+	struct acpi_device *pwr_btn_adev;
474478 	u32 acpi_state = acpi_target_sleep_state;
475479 
476480 	acpi_ec_unblock_transactions();
....@@ -501,11 +505,11 @@
501505 		return;
502506 
503507 	pwr_btn_event_pending = false;
504
-	pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
505
-				      find_powerf_dev);
506
-	if (pwr_btn_dev) {
507
-		pm_wakeup_event(pwr_btn_dev, 0);
508
-		put_device(pwr_btn_dev);
508
+	pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
509
+						    NULL, -1);
510
+	if (pwr_btn_adev) {
511
+		pm_wakeup_event(&pwr_btn_adev->dev, 0);
512
+		acpi_dev_put(pwr_btn_adev);
509513 	}
510514 }
511515 
....@@ -534,8 +538,9 @@
534538 	acpi_sleep_tts_switch(acpi_target_sleep_state);
535539 }
536540 #else /* !CONFIG_ACPI_SLEEP */
541
+#define sleep_no_lps0	(1)
537542 #define acpi_target_sleep_state	ACPI_STATE_S0
538
-#define acpi_sleep_no_lps0	(false)
543
+#define acpi_sleep_default_s3	(1)
539544 static inline void acpi_sleep_dmi_check(void) {}
540545 #endif /* CONFIG_ACPI_SLEEP */
541546 
....@@ -701,7 +706,6 @@
701706 	.recover = acpi_pm_finish,
702707 };
703708 
704
-static bool s2idle_in_progress;
705709 static bool s2idle_wakeup;
706710 
707711 /*
....@@ -914,41 +918,42 @@
914918 	if (lps0_device_handle)
915919 		return 0;
916920 
917
-	if (acpi_sleep_no_lps0) {
918
-		acpi_handle_info(adev->handle,
919
-				 "Low Power S0 Idle interface disabled\n");
920
-		return 0;
921
-	}
922
-
923921 	if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
924922 		return 0;
925923 
926924 	guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
927925 	/* Check if the _DSM is present and as expected. */
928926 	out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
929
-	if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
930
-		char bitmask = *(char *)out_obj->buffer.pointer;
931
-
932
-		lps0_dsm_func_mask = bitmask;
933
-		lps0_device_handle = adev->handle;
934
-		/*
935
-		 * Use suspend-to-idle by default if the default
936
-		 * suspend mode was not set from the command line.
937
-		 */
938
-		if (mem_sleep_default > PM_SUSPEND_MEM)
939
-			mem_sleep_current = PM_SUSPEND_TO_IDLE;
940
-
941
-		acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
942
-				  bitmask);
943
-
944
-		acpi_ec_mark_gpe_for_wake();
945
-	} else {
927
+	if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
946928 		acpi_handle_debug(adev->handle,
947929 				  "_DSM function 0 evaluation failed\n");
930
+		return 0;
948931 	}
932
+
933
+	lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
934
+
949935 	ACPI_FREE(out_obj);
950936 
937
+	acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
938
+			  lps0_dsm_func_mask);
939
+
940
+	lps0_device_handle = adev->handle;
941
+
951942 	lpi_device_get_constraints();
943
+
944
+	/*
945
+	 * Use suspend-to-idle by default if the default suspend mode was not
946
+	 * set from the command line.
947
+	 */
948
+	if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
949
+		mem_sleep_current = PM_SUSPEND_TO_IDLE;
950
+
951
+	/*
952
+	 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
953
+	 * EC GPE to be enabled while suspended for certain wakeup devices to
954
+	 * work, so mark it as wakeup-capable.
955
+	 */
956
+	acpi_ec_mark_gpe_for_wake();
952957 
953958 	return 0;
954959 }
....@@ -961,97 +966,149 @@
961966 static int acpi_s2idle_begin(void)
962967 {
963968 	acpi_scan_lock_acquire();
964
-	s2idle_in_progress = true;
965969 	return 0;
966970 }
967971 
968972 static int acpi_s2idle_prepare(void)
969973 {
970
-	if (lps0_device_handle) {
971
-		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
972
-		acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
973
-
974
+	if (acpi_sci_irq_valid()) {
975
+		enable_irq_wake(acpi_sci_irq);
974976 		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
975977 	}
976
-
977
-	if (acpi_sci_irq_valid())
978
-		enable_irq_wake(acpi_sci_irq);
979978 
980979 	acpi_enable_wakeup_devices(ACPI_STATE_S0);
981980 
982981 	/* Change the configuration of GPEs to avoid spurious wakeup. */
983982 	acpi_enable_all_wakeup_gpes();
984983 	acpi_os_wait_events_complete();
984
+
985
+	s2idle_wakeup = true;
985986 	return 0;
986987 }
987988 
988
-static void acpi_s2idle_wake(void)
989
+static int acpi_s2idle_prepare_late(void)
989990 {
991
+	if (!lps0_device_handle || sleep_no_lps0)
992
+		return 0;
990993 
991994 	if (pm_debug_messages_on)
992995 		lpi_check_constraints();
993996 
994
-	/*
995
-	 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
996
-	 * that the SCI has triggered while suspended, so cancel the wakeup in
997
-	 * case it has not been a wakeup event (the GPEs will be checked later).
998
-	 */
999
-	if (acpi_sci_irq_valid() &&
1000
-	    !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1001
-		pm_system_cancel_wakeup();
1002
-		s2idle_wakeup = true;
1003
-		/*
1004
-		 * On some platforms with the LPS0 _DSM device noirq resume
1005
-		 * takes too much time for EC wakeup events to survive, so look
1006
-		 * for them now.
1007
-		 */
1008
-		if (lps0_device_handle)
1009
-			acpi_ec_dispatch_gpe();
1010
-	}
997
+	acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
998
+	acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
999
+
1000
+	return 0;
10111001 }
10121002 
1013
-static void acpi_s2idle_sync(void)
1003
+static bool acpi_s2idle_wake(void)
10141004 {
1015
-	/*
1016
-	 * Process all pending events in case there are any wakeup ones.
1017
-	 *
1018
-	 * The EC driver uses the system workqueue and an additional special
1019
-	 * one, so those need to be flushed too.
1020
-	 */
1021
-	acpi_os_wait_events_complete();	/* synchronize SCI IRQ handling */
1022
-	acpi_ec_flush_work();
1023
-	acpi_os_wait_events_complete();	/* synchronize Notify handling */
1024
-	s2idle_wakeup = false;
1005
+	if (!acpi_sci_irq_valid())
1006
+		return pm_wakeup_pending();
1007
+
1008
+	while (pm_wakeup_pending()) {
1009
+		/*
1010
+		 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
1011
+		 * SCI has not triggered while suspended, so bail out (the
1012
+		 * wakeup is pending anyway and the SCI is not the source of
1013
+		 * it).
1014
+		 */
1015
+		if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1016
+			pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
1017
+			return true;
1018
+		}
1019
+
1020
+		/*
1021
+		 * If the status bit of any enabled fixed event is set, the
1022
+		 * wakeup is regarded as valid.
1023
+		 */
1024
+		if (acpi_any_fixed_event_status_set()) {
1025
+			pm_pr_dbg("ACPI fixed event wakeup\n");
1026
+			return true;
1027
+		}
1028
+
1029
+		/* Check wakeups from drivers sharing the SCI. */
1030
+		if (acpi_check_wakeup_handlers()) {
1031
+			pm_pr_dbg("ACPI custom handler wakeup\n");
1032
+			return true;
1033
+		}
1034
+
1035
+		/* Check non-EC GPE wakeups and dispatch the EC GPE. */
1036
+		if (acpi_ec_dispatch_gpe()) {
1037
+			pm_pr_dbg("ACPI non-EC GPE wakeup\n");
1038
+			return true;
1039
+		}
1040
+
1041
+		/*
1042
+		 * Cancel the SCI wakeup and process all pending events in case
1043
+		 * there are any wakeup ones in there.
1044
+		 *
1045
+		 * Note that if any non-EC GPEs are active at this point, the
1046
+		 * SCI will retrigger after the rearming below, so no events
1047
+		 * should be missed by canceling the wakeup here.
1048
+		 */
1049
+		pm_system_cancel_wakeup();
1050
+		acpi_os_wait_events_complete();
1051
+
1052
+		/*
1053
+		 * The SCI is in the "suspended" state now and it cannot produce
1054
+		 * new wakeup events till the rearming below, so if any of them
1055
+		 * are pending here, they must be resulting from the processing
1056
+		 * of EC events above or coming from somewhere else.
1057
+		 */
1058
+		if (pm_wakeup_pending()) {
1059
+			pm_pr_dbg("Wakeup after ACPI Notify sync\n");
1060
+			return true;
1061
+		}
1062
+
1063
+		pm_wakeup_clear(acpi_sci_irq);
1064
+		rearm_wake_irq(acpi_sci_irq);
1065
+	}
1066
+
1067
+	return false;
1068
+}
1069
+
1070
+static void acpi_s2idle_restore_early(void)
1071
+{
1072
+	if (!lps0_device_handle || sleep_no_lps0)
1073
+		return;
1074
+
1075
+	acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1076
+	acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
10251077 }
10261078 
10271079 static void acpi_s2idle_restore(void)
10281080 {
1081
+	/*
1082
+	 * Drain pending events before restoring the working-state configuration
1083
+	 * of GPEs.
1084
+	 */
1085
+	acpi_os_wait_events_complete(); /* synchronize GPE processing */
1086
+	acpi_ec_flush_work(); /* flush the EC driver's workqueues */
1087
+	acpi_os_wait_events_complete(); /* synchronize Notify handling */
1088
+
1089
+	s2idle_wakeup = false;
1090
+
10291091 	acpi_enable_all_runtime_gpes();
10301092 
10311093 	acpi_disable_wakeup_devices(ACPI_STATE_S0);
10321094 
1033
-	if (acpi_sci_irq_valid())
1034
-		disable_irq_wake(acpi_sci_irq);
1035
-
1036
-	if (lps0_device_handle) {
1095
+	if (acpi_sci_irq_valid()) {
10371096 		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1038
-
1039
-		acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1040
-		acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1097
+		disable_irq_wake(acpi_sci_irq);
10411098 	}
10421099 }
10431100 
10441101 static void acpi_s2idle_end(void)
10451102 {
1046
-	s2idle_in_progress = false;
10471103 	acpi_scan_lock_release();
10481104 }
10491105 
10501106 static const struct platform_s2idle_ops acpi_s2idle_ops = {
10511107 	.begin = acpi_s2idle_begin,
10521108 	.prepare = acpi_s2idle_prepare,
1109
+	.prepare_late = acpi_s2idle_prepare_late,
10531110 	.wake = acpi_s2idle_wake,
1054
-	.sync = acpi_s2idle_sync,
1111
+	.restore_early = acpi_s2idle_restore_early,
10551112 	.restore = acpi_s2idle_restore,
10561113 	.end = acpi_s2idle_end,
10571114 };
....@@ -1072,7 +1129,6 @@
10721129 }
10731130 
10741131 #else /* !CONFIG_SUSPEND */
1075
-#define s2idle_in_progress	(false)
10761132 #define s2idle_wakeup		(false)
10771133 #define lps0_device_handle	(NULL)
10781134 static inline void acpi_sleep_suspend_setup(void) {}
....@@ -1081,11 +1137,6 @@
10811137 bool acpi_s2idle_wakeup(void)
10821138 {
10831139 	return s2idle_wakeup;
1084
-}
1085
-
1086
-bool acpi_sleep_no_ec_events(void)
1087
-{
1088
-	return !s2idle_in_progress || !lps0_device_handle;
10891140 }
10901141 
10911142 #ifdef CONFIG_PM_SLEEP
....@@ -1131,15 +1182,19 @@
11311182 	nosigcheck = true;
11321183 }
11331184 
1134
-static int acpi_hibernation_begin(void)
1185
+static int acpi_hibernation_begin(pm_message_t stage)
11351186 {
1136
-	int error;
1187
+	if (!nvs_nosave) {
1188
+		int error = suspend_nvs_alloc();
1189
+		if (error)
1190
+			return error;
1191
+	}
11371192 
1138
-	error = nvs_nosave ? 0 : suspend_nvs_alloc();
1139
-	if (!error)
1140
-		acpi_pm_start(ACPI_STATE_S4);
1193
+	if (stage.event == PM_EVENT_HIBERNATE)
1194
+		pm_set_suspend_via_firmware();
11411195 
1142
-	return error;
1196
+	acpi_pm_start(ACPI_STATE_S4);
1197
+	return 0;
11431198 }
11441199 
11451200 static int acpi_hibernation_enter(void)
....@@ -1199,7 +1254,7 @@
11991254  *		function is used if the pre-ACPI 2.0 suspend ordering has been
12001255  *		requested.
12011256  */
1202
-static int acpi_hibernation_begin_old(void)
1257
+static int acpi_hibernation_begin_old(pm_message_t stage)
12031258 {
12041259 	int error;
12051260 	/*
....@@ -1210,16 +1265,21 @@
12101265 	acpi_sleep_tts_switch(ACPI_STATE_S4);
12111266 
12121267 	error = acpi_sleep_prepare(ACPI_STATE_S4);
1268
+	if (error)
1269
+		return error;
12131270 
1214
-	if (!error) {
1215
-		if (!nvs_nosave)
1216
-			error = suspend_nvs_alloc();
1217
-		if (!error) {
1218
-			acpi_target_sleep_state = ACPI_STATE_S4;
1219
-			acpi_scan_lock_acquire();
1220
-		}
1271
+	if (!nvs_nosave) {
1272
+		error = suspend_nvs_alloc();
1273
+		if (error)
1274
+			return error;
12211275 	}
1222
-	return error;
1276
+
1277
+	if (stage.event == PM_EVENT_HIBERNATE)
1278
+		pm_set_suspend_via_firmware();
1279
+
1280
+	acpi_target_sleep_state = ACPI_STATE_S4;
1281
+	acpi_scan_lock_acquire();
1282
+	return 0;
12231283 }
12241284 
12251285 /*