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PM: hibernate: Add pm_hibernation_mode_is_suspend()

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Some drivers have different flows for hibernation and suspend. If
the driver opportunistically will skip thaw() then it needs a hint
to know what is happening after the hibernate.

Introduce a new symbol pm_hibernation_mode_is_suspend() that drivers
can call to determine if suspending the system for this purpose.

Tested-by: Ionut Nechita <ionut_n2001@yahoo.com>
Tested-by: Kenneth Crudup <kenny@panix.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello (AMD) 2025-09-25 13:51:07 -05:00 committed by Rafael J. Wysocki
parent 469d80a371
commit 495c8d3503
2 changed files with 13 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/suspend.h
View file

@ -276,6 +276,7 @@ extern void arch_suspend_enable_irqs(void);
extern int pm_suspend(suspend_state_t state); extern int pm_suspend(suspend_state_t state);
extern bool sync_on_suspend_enabled; extern bool sync_on_suspend_enabled;
bool pm_hibernation_mode_is_suspend(void);
#else /* !CONFIG_SUSPEND */ #else /* !CONFIG_SUSPEND */
#define suspend_valid_only_mem NULL #define suspend_valid_only_mem NULL
@ -288,6 +289,7 @@ static inline bool pm_suspend_via_firmware(void) { return false; }
static inline bool pm_resume_via_firmware(void) { return false; } static inline bool pm_resume_via_firmware(void) { return false; }
static inline bool pm_suspend_no_platform(void) { return false; } static inline bool pm_suspend_no_platform(void) { return false; }
static inline bool pm_suspend_default_s2idle(void) { return false; } static inline bool pm_suspend_default_s2idle(void) { return false; }
static inline bool pm_hibernation_mode_is_suspend(void) { return false; }
static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {} 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 int pm_suspend(suspend_state_t state) { return -ENOSYS; }

11
kernel/power/hibernate.c
View file

@ -80,6 +80,17 @@ static const struct platform_hibernation_ops *hibernation_ops;
static atomic_t hibernate_atomic = ATOMIC_INIT(1); static atomic_t hibernate_atomic = ATOMIC_INIT(1);
#ifdef CONFIG_SUSPEND
/**
* pm_hibernation_mode_is_suspend - Check if hibernation has been set to suspend
*/
bool pm_hibernation_mode_is_suspend(void)
{
return hibernation_mode == HIBERNATION_SUSPEND;
}
EXPORT_SYMBOL_GPL(pm_hibernation_mode_is_suspend);
#endif
bool hibernate_acquire(void) bool hibernate_acquire(void)
{ {
return atomic_add_unless(&hibernate_atomic, -1, 0); return atomic_add_unless(&hibernate_atomic, -1, 0);