Commit 0ca04993 authored by Mario Limonciello (AMD)'s avatar Mario Limonciello (AMD) Committed by Rafael J. Wysocki
Browse files

PM: Introduce new PMSG_POWEROFF event 



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: default avatarEric Naim <dnaim@cachyos.org>
Signed-off-by: default avatarMario Limonciello (AMD) <superm1@kernel.org>
Link: https://patch.msgid.link/20251112224025.2051702-2-superm1@kernel.org


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 9cf02802

drivers/base/power/main.c

+5 −0
Original line number Diff line number Diff line
@@ -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:

include/linux/pm.h

+3 −0
Original line number Diff line number Diff line
@@ -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, })

include/trace/events/power.h

+2 −1
Original line number Diff line number Diff line
@@ -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,