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PM: Introduce new PMSG_POWEROFF event

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PMSG_POWEROFF will be used for the PM core to allow differentiating between
a hibernation or shutdown sequence when re-using callbacks for common code.

Hibernation is started by writing a hibernation method (such as 'platform'
'shutdown', or 'reboot') to use into /sys/power/disk and writing 'disk' to
/sys/power/state.

Shutdown is initiated with the reboot() syscall with arguments on whether
to halt the system or power it off.

Tested-by: Eric Naim <dnaim@cachyos.org>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Link: https://patch.msgid.link/20251112224025.2051702-2-superm1@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello (AMD)
2025-11-12 16:40:23 -06:00
committed by Rafael J. Wysocki
parent 9cf02802d6
commit 0ca04993da
3 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/base/power/main.c
View File

@@ -96,6 +96,8 @@ static const char *pm_verb(int event)
return "restore";
case PM_EVENT_RECOVER:
return "recover";
case PM_EVENT_POWEROFF:
return "poweroff";
default:
return "(unknown PM event)";
}
@@ -368,6 +370,7 @@ static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
return ops->freeze;
case PM_EVENT_POWEROFF:
case PM_EVENT_HIBERNATE:
return ops->poweroff;
case PM_EVENT_THAW:
@@ -402,6 +405,7 @@ static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
return ops->freeze_late;
case PM_EVENT_POWEROFF:
case PM_EVENT_HIBERNATE:
return ops->poweroff_late;
case PM_EVENT_THAW:
@@ -436,6 +440,7 @@ static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t stat
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
return ops->freeze_noirq;
case PM_EVENT_POWEROFF:
case PM_EVENT_HIBERNATE:
return ops->poweroff_noirq;
case PM_EVENT_THAW:

3
include/linux/pm.h
View File

@@ -508,6 +508,7 @@ const struct dev_pm_ops name = { \
* RECOVER Creation of a hibernation image or restoration of the main
* memory contents from a hibernation image has failed, call
* ->thaw() and ->complete() for all devices.
* POWEROFF System will poweroff, call ->poweroff() for all devices.
*
* The following PM_EVENT_ messages are defined for internal use by
* kernel subsystems. They are never issued by the PM core.
@@ -538,6 +539,7 @@ const struct dev_pm_ops name = { \
#define PM_EVENT_USER 0x0100
#define PM_EVENT_REMOTE 0x0200
#define PM_EVENT_AUTO 0x0400
#define PM_EVENT_POWEROFF 0x0800
#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
#define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
@@ -552,6 +554,7 @@ const struct dev_pm_ops name = { \
#define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_POWEROFF ((struct pm_message){ .event = PM_EVENT_POWEROFF, })
#define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
#define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
#define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })

3
include/trace/events/power.h
View File

@@ -179,7 +179,8 @@ TRACE_EVENT(pstate_sample,
{ PM_EVENT_HIBERNATE, "hibernate" }, \
{ PM_EVENT_THAW, "thaw" }, \
{ PM_EVENT_RESTORE, "restore" }, \
{ PM_EVENT_RECOVER, "recover" })
{ PM_EVENT_RECOVER, "recover" }, \
{ PM_EVENT_POWEROFF, "poweroff" })
DEFINE_EVENT(cpu, cpu_frequency,