v4.19.13 snapshot.
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
new file mode 100644
index 0000000..3f529ad
--- /dev/null
+++ b/include/linux/suspend.h
@@ -0,0 +1,542 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SUSPEND_H
+#define _LINUX_SUSPEND_H
+
+#include <linux/swap.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/mm.h>
+#include <linux/freezer.h>
+#include <asm/errno.h>
+
+#ifdef CONFIG_VT
+extern void pm_set_vt_switch(int);
+#else
+static inline void pm_set_vt_switch(int do_switch)
+{
+}
+#endif
+
+#ifdef CONFIG_VT_CONSOLE_SLEEP
+extern void pm_prepare_console(void);
+extern void pm_restore_console(void);
+#else
+static inline void pm_prepare_console(void)
+{
+}
+
+static inline void pm_restore_console(void)
+{
+}
+#endif
+
+typedef int __bitwise suspend_state_t;
+
+#define PM_SUSPEND_ON ((__force suspend_state_t) 0)
+#define PM_SUSPEND_TO_IDLE ((__force suspend_state_t) 1)
+#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2)
+#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
+#define PM_SUSPEND_MIN PM_SUSPEND_TO_IDLE
+#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
+
+enum suspend_stat_step {
+ SUSPEND_FREEZE = 1,
+ SUSPEND_PREPARE,
+ SUSPEND_SUSPEND,
+ SUSPEND_SUSPEND_LATE,
+ SUSPEND_SUSPEND_NOIRQ,
+ SUSPEND_RESUME_NOIRQ,
+ SUSPEND_RESUME_EARLY,
+ SUSPEND_RESUME
+};
+
+struct suspend_stats {
+ int success;
+ int fail;
+ int failed_freeze;
+ int failed_prepare;
+ int failed_suspend;
+ int failed_suspend_late;
+ int failed_suspend_noirq;
+ int failed_resume;
+ int failed_resume_early;
+ int failed_resume_noirq;
+#define REC_FAILED_NUM 2
+ int last_failed_dev;
+ char failed_devs[REC_FAILED_NUM][40];
+ int last_failed_errno;
+ int errno[REC_FAILED_NUM];
+ int last_failed_step;
+ enum suspend_stat_step failed_steps[REC_FAILED_NUM];
+};
+
+extern struct suspend_stats suspend_stats;
+
+static inline void dpm_save_failed_dev(const char *name)
+{
+ strlcpy(suspend_stats.failed_devs[suspend_stats.last_failed_dev],
+ name,
+ sizeof(suspend_stats.failed_devs[0]));
+ suspend_stats.last_failed_dev++;
+ suspend_stats.last_failed_dev %= REC_FAILED_NUM;
+}
+
+static inline void dpm_save_failed_errno(int err)
+{
+ suspend_stats.errno[suspend_stats.last_failed_errno] = err;
+ suspend_stats.last_failed_errno++;
+ suspend_stats.last_failed_errno %= REC_FAILED_NUM;
+}
+
+static inline void dpm_save_failed_step(enum suspend_stat_step step)
+{
+ suspend_stats.failed_steps[suspend_stats.last_failed_step] = step;
+ suspend_stats.last_failed_step++;
+ suspend_stats.last_failed_step %= REC_FAILED_NUM;
+}
+
+/**
+ * struct platform_suspend_ops - Callbacks for managing platform dependent
+ * system sleep states.
+ *
+ * @valid: Callback to determine if given system sleep state is supported by
+ * the platform.
+ * Valid (ie. supported) states are advertised in /sys/power/state. Note
+ * that it still may be impossible to enter given system sleep state if the
+ * conditions aren't right.
+ * There is the %suspend_valid_only_mem function available that can be
+ * assigned to this if the platform only supports mem sleep.
+ *
+ * @begin: Initialise a transition to given system sleep state.
+ * @begin() is executed right prior to suspending devices. The information
+ * conveyed to the platform code by @begin() should be disregarded by it as
+ * soon as @end() is executed. If @begin() fails (ie. returns nonzero),
+ * @prepare(), @enter() and @finish() will not be called by the PM core.
+ * This callback is optional. However, if it is implemented, the argument
+ * passed to @enter() is redundant and should be ignored.
+ *
+ * @prepare: Prepare the platform for entering the system sleep state indicated
+ * by @begin().
+ * @prepare() is called right after devices have been suspended (ie. the
+ * appropriate .suspend() method has been executed for each device) and
+ * before device drivers' late suspend callbacks are executed. It returns
+ * 0 on success or a negative error code otherwise, in which case the
+ * system cannot enter the desired sleep state (@prepare_late(), @enter(),
+ * and @wake() will not be called in that case).
+ *
+ * @prepare_late: Finish preparing the platform for entering the system sleep
+ * state indicated by @begin().
+ * @prepare_late is called before disabling nonboot CPUs and after
+ * device drivers' late suspend callbacks have been executed. It returns
+ * 0 on success or a negative error code otherwise, in which case the
+ * system cannot enter the desired sleep state (@enter() will not be
+ * executed).
+ *
+ * @enter: Enter the system sleep state indicated by @begin() or represented by
+ * the argument if @begin() is not implemented.
+ * This callback is mandatory. It returns 0 on success or a negative
+ * error code otherwise, in which case the system cannot enter the desired
+ * sleep state.
+ *
+ * @wake: Called when the system has just left a sleep state, right after
+ * the nonboot CPUs have been enabled and before device drivers' early
+ * resume callbacks are executed.
+ * This callback is optional, but should be implemented by the platforms
+ * that implement @prepare_late(). If implemented, it is always called
+ * after @prepare_late and @enter(), even if one of them fails.
+ *
+ * @finish: Finish wake-up of the platform.
+ * @finish is called right prior to calling device drivers' regular suspend
+ * callbacks.
+ * This callback is optional, but should be implemented by the platforms
+ * that implement @prepare(). If implemented, it is always called after
+ * @enter() and @wake(), even if any of them fails. It is executed after
+ * a failing @prepare.
+ *
+ * @suspend_again: Returns whether the system should suspend again (true) or
+ * not (false). If the platform wants to poll sensors or execute some
+ * code during suspended without invoking userspace and most of devices,
+ * suspend_again callback is the place assuming that periodic-wakeup or
+ * alarm-wakeup is already setup. This allows to execute some codes while
+ * being kept suspended in the view of userland and devices.
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ * the platform that the system has returned to the working state or
+ * the transition to the sleep state has been aborted.
+ * This callback is optional, but should be implemented by the platforms
+ * that implement @begin(). Accordingly, platforms implementing @begin()
+ * should also provide a @end() which cleans up transitions aborted before
+ * @enter().
+ *
+ * @recover: Recover the platform from a suspend failure.
+ * Called by the PM core if the suspending of devices fails.
+ * This callback is optional and should only be implemented by platforms
+ * which require special recovery actions in that situation.
+ */
+struct platform_suspend_ops {
+ int (*valid)(suspend_state_t state);
+ int (*begin)(suspend_state_t state);
+ int (*prepare)(void);
+ int (*prepare_late)(void);
+ int (*enter)(suspend_state_t state);
+ void (*wake)(void);
+ void (*finish)(void);
+ bool (*suspend_again)(void);
+ void (*end)(void);
+ void (*recover)(void);
+};
+
+struct platform_s2idle_ops {
+ int (*begin)(void);
+ int (*prepare)(void);
+ void (*wake)(void);
+ void (*sync)(void);
+ void (*restore)(void);
+ void (*end)(void);
+};
+
+#ifdef CONFIG_SUSPEND
+extern suspend_state_t mem_sleep_current;
+extern suspend_state_t mem_sleep_default;
+
+/**
+ * suspend_set_ops - set platform dependent suspend operations
+ * @ops: The new suspend operations to set.
+ */
+extern void suspend_set_ops(const struct platform_suspend_ops *ops);
+extern int suspend_valid_only_mem(suspend_state_t state);
+
+extern unsigned int pm_suspend_global_flags;
+
+#define PM_SUSPEND_FLAG_FW_SUSPEND (1 << 0)
+#define PM_SUSPEND_FLAG_FW_RESUME (1 << 1)
+
+static inline void pm_suspend_clear_flags(void)
+{
+ pm_suspend_global_flags = 0;
+}
+
+static inline void pm_set_suspend_via_firmware(void)
+{
+ pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_SUSPEND;
+}
+
+static inline void pm_set_resume_via_firmware(void)
+{
+ pm_suspend_global_flags |= PM_SUSPEND_FLAG_FW_RESUME;
+}
+
+static inline bool pm_suspend_via_firmware(void)
+{
+ return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_SUSPEND);
+}
+
+static inline bool pm_resume_via_firmware(void)
+{
+ return !!(pm_suspend_global_flags & PM_SUSPEND_FLAG_FW_RESUME);
+}
+
+/* Suspend-to-idle state machnine. */
+enum s2idle_states {
+ S2IDLE_STATE_NONE, /* Not suspended/suspending. */
+ S2IDLE_STATE_ENTER, /* Enter suspend-to-idle. */
+ S2IDLE_STATE_WAKE, /* Wake up from suspend-to-idle. */
+};
+
+extern enum s2idle_states __read_mostly s2idle_state;
+
+static inline bool idle_should_enter_s2idle(void)
+{
+ return unlikely(s2idle_state == S2IDLE_STATE_ENTER);
+}
+
+extern bool pm_suspend_via_s2idle(void);
+extern void __init pm_states_init(void);
+extern void s2idle_set_ops(const struct platform_s2idle_ops *ops);
+extern void s2idle_wake(void);
+
+/**
+ * arch_suspend_disable_irqs - disable IRQs for suspend
+ *
+ * Disables IRQs (in the default case). This is a weak symbol in the common
+ * code and thus allows architectures to override it if more needs to be
+ * done. Not called for suspend to disk.
+ */
+extern void arch_suspend_disable_irqs(void);
+
+/**
+ * arch_suspend_enable_irqs - enable IRQs after suspend
+ *
+ * Enables IRQs (in the default case). This is a weak symbol in the common
+ * code and thus allows architectures to override it if more needs to be
+ * done. Not called for suspend to disk.
+ */
+extern void arch_suspend_enable_irqs(void);
+
+extern int pm_suspend(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+#define suspend_valid_only_mem NULL
+
+static inline void pm_suspend_clear_flags(void) {}
+static inline void pm_set_suspend_via_firmware(void) {}
+static inline void pm_set_resume_via_firmware(void) {}
+static inline bool pm_suspend_via_firmware(void) { return false; }
+static inline bool pm_resume_via_firmware(void) { return false; }
+static inline bool pm_suspend_via_s2idle(void) { return false; }
+
+static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {}
+static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
+static inline bool idle_should_enter_s2idle(void) { return false; }
+static inline void __init pm_states_init(void) {}
+static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
+static inline void s2idle_wake(void) {}
+#endif /* !CONFIG_SUSPEND */
+
+/* struct pbe is used for creating lists of pages that should be restored
+ * atomically during the resume from disk, because the page frames they have
+ * occupied before the suspend are in use.
+ */
+struct pbe {
+ void *address; /* address of the copy */
+ void *orig_address; /* original address of a page */
+ struct pbe *next;
+};
+
+/* mm/page_alloc.c */
+extern void mark_free_pages(struct zone *zone);
+
+/**
+ * struct platform_hibernation_ops - hibernation platform support
+ *
+ * The methods in this structure allow a platform to carry out special
+ * operations required by it during a hibernation transition.
+ *
+ * All the methods below, except for @recover(), must be implemented.
+ *
+ * @begin: Tell the platform driver that we're starting hibernation.
+ * Called right after shrinking memory and before freezing devices.
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ * the platform that the system has returned to the working state.
+ *
+ * @pre_snapshot: Prepare the platform for creating the hibernation image.
+ * Called right after devices have been frozen and before the nonboot
+ * CPUs are disabled (runs with IRQs on).
+ *
+ * @finish: Restore the previous state of the platform after the hibernation
+ * image has been created *or* put the platform into the normal operation
+ * mode after the hibernation (the same method is executed in both cases).
+ * Called right after the nonboot CPUs have been enabled and before
+ * thawing devices (runs with IRQs on).
+ *
+ * @prepare: Prepare the platform for entering the low power state.
+ * Called right after the hibernation image has been saved and before
+ * devices are prepared for entering the low power state.
+ *
+ * @enter: Put the system into the low power state after the hibernation image
+ * has been saved to disk.
+ * Called after the nonboot CPUs have been disabled and all of the low
+ * level devices have been shut down (runs with IRQs off).
+ *
+ * @leave: Perform the first stage of the cleanup after the system sleep state
+ * indicated by @set_target() has been left.
+ * Called right after the control has been passed from the boot kernel to
+ * the image kernel, before the nonboot CPUs are enabled and before devices
+ * are resumed. Executed with interrupts disabled.
+ *
+ * @pre_restore: Prepare system for the restoration from a hibernation image.
+ * Called right after devices have been frozen and before the nonboot
+ * CPUs are disabled (runs with IRQs on).
+ *
+ * @restore_cleanup: Clean up after a failing image restoration.
+ * Called right after the nonboot CPUs have been enabled and before
+ * thawing devices (runs with IRQs on).
+ *
+ * @recover: Recover the platform from a failure to suspend devices.
+ * Called by the PM core if the suspending of devices during hibernation
+ * fails. This callback is optional and should only be implemented by
+ * platforms which require special recovery actions in that situation.
+ */
+struct platform_hibernation_ops {
+ int (*begin)(void);
+ void (*end)(void);
+ int (*pre_snapshot)(void);
+ void (*finish)(void);
+ int (*prepare)(void);
+ int (*enter)(void);
+ void (*leave)(void);
+ int (*pre_restore)(void);
+ void (*restore_cleanup)(void);
+ void (*recover)(void);
+};
+
+#ifdef CONFIG_HIBERNATION
+/* kernel/power/snapshot.c */
+extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
+static inline void __init register_nosave_region(unsigned long b, unsigned long e)
+{
+ __register_nosave_region(b, e, 0);
+}
+static inline void __init register_nosave_region_late(unsigned long b, unsigned long e)
+{
+ __register_nosave_region(b, e, 1);
+}
+extern int swsusp_page_is_forbidden(struct page *);
+extern void swsusp_set_page_free(struct page *);
+extern void swsusp_unset_page_free(struct page *);
+extern unsigned long get_safe_page(gfp_t gfp_mask);
+extern asmlinkage int swsusp_arch_suspend(void);
+extern asmlinkage int swsusp_arch_resume(void);
+
+extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
+extern int hibernate(void);
+extern bool system_entering_hibernation(void);
+extern bool hibernation_available(void);
+asmlinkage int swsusp_save(void);
+extern struct pbe *restore_pblist;
+#else /* CONFIG_HIBERNATION */
+static inline void register_nosave_region(unsigned long b, unsigned long e) {}
+static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
+static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
+static inline void swsusp_set_page_free(struct page *p) {}
+static inline void swsusp_unset_page_free(struct page *p) {}
+
+static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
+static inline int hibernate(void) { return -ENOSYS; }
+static inline bool system_entering_hibernation(void) { return false; }
+static inline bool hibernation_available(void) { return false; }
+#endif /* CONFIG_HIBERNATION */
+
+/* Hibernation and suspend events */
+#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
+#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
+#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
+#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
+#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */
+#define PM_POST_RESTORE 0x0006 /* Restore failed */
+
+extern struct mutex system_transition_mutex;
+
+#ifdef CONFIG_PM_SLEEP
+void save_processor_state(void);
+void restore_processor_state(void);
+
+/* kernel/power/main.c */
+extern int register_pm_notifier(struct notifier_block *nb);
+extern int unregister_pm_notifier(struct notifier_block *nb);
+
+#define pm_notifier(fn, pri) { \
+ static struct notifier_block fn##_nb = \
+ { .notifier_call = fn, .priority = pri }; \
+ register_pm_notifier(&fn##_nb); \
+}
+
+/* drivers/base/power/wakeup.c */
+extern bool events_check_enabled;
+extern unsigned int pm_wakeup_irq;
+extern suspend_state_t pm_suspend_target_state;
+
+extern bool pm_wakeup_pending(void);
+extern void pm_system_wakeup(void);
+extern void pm_system_cancel_wakeup(void);
+extern void pm_wakeup_clear(bool reset);
+extern void pm_system_irq_wakeup(unsigned int irq_number);
+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);
+extern void pm_print_active_wakeup_sources(void);
+
+extern void lock_system_sleep(void);
+extern void unlock_system_sleep(void);
+
+#else /* !CONFIG_PM_SLEEP */
+
+static inline int register_pm_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline int unregister_pm_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+#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(bool reset) {}
+static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
+
+static inline void lock_system_sleep(void) {}
+static inline void unlock_system_sleep(void) {}
+
+#endif /* !CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_SLEEP_DEBUG
+extern bool pm_print_times_enabled;
+extern bool pm_debug_messages_on;
+extern __printf(2, 3) void __pm_pr_dbg(bool defer, const char *fmt, ...);
+#else
+#define pm_print_times_enabled (false)
+#define pm_debug_messages_on (false)
+
+#include <linux/printk.h>
+
+#define __pm_pr_dbg(defer, fmt, ...) \
+ no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
+#endif
+
+#define pm_pr_dbg(fmt, ...) \
+ __pm_pr_dbg(false, fmt, ##__VA_ARGS__)
+
+#define pm_deferred_pr_dbg(fmt, ...) \
+ __pm_pr_dbg(true, fmt, ##__VA_ARGS__)
+
+#ifdef CONFIG_PM_AUTOSLEEP
+
+/* kernel/power/autosleep.c */
+void queue_up_suspend_work(void);
+
+#else /* !CONFIG_PM_AUTOSLEEP */
+
+static inline void queue_up_suspend_work(void) {}
+
+#endif /* !CONFIG_PM_AUTOSLEEP */
+
+#ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
+/*
+ * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
+ * to save/restore additional information to/from the array of page
+ * frame numbers in the hibernation image. For s390 this is used to
+ * save and restore the storage key for each page that is included
+ * in the hibernation image.
+ */
+unsigned long page_key_additional_pages(unsigned long pages);
+int page_key_alloc(unsigned long pages);
+void page_key_free(void);
+void page_key_read(unsigned long *pfn);
+void page_key_memorize(unsigned long *pfn);
+void page_key_write(void *address);
+
+#else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
+
+static inline unsigned long page_key_additional_pages(unsigned long pages)
+{
+ return 0;
+}
+
+static inline int page_key_alloc(unsigned long pages)
+{
+ return 0;
+}
+
+static inline void page_key_free(void) {}
+static inline void page_key_read(unsigned long *pfn) {}
+static inline void page_key_memorize(unsigned long *pfn) {}
+static inline void page_key_write(void *address) {}
+
+#endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
+
+#endif /* _LINUX_SUSPEND_H */