cpu/hotplug: Document states better (d10ef6f9) · Commits · e / devices / android_kernel_fairphone_FP4

kernel/cpu.c

+46 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1172,6 +1172,10 @@ static struct cpuhp_step cpuhp_bp_states[] = {
	.teardown = NULL,		.teardown = NULL,
	.cant_stop = true,		.cant_stop = true,
	},		},
			/*
			* Preparatory and dead notifiers. Will be replaced once the notifiers
			* are converted to states.
			*/
	[CPUHP_NOTIFY_PREPARE] = {		[CPUHP_NOTIFY_PREPARE] = {
	.name = "notify:prepare",		.name = "notify:prepare",
	.startup = notify_prepare,		.startup = notify_prepare,
	@@ -1179,12 +1183,17 @@ static struct cpuhp_step cpuhp_bp_states[] = {
	.skip_onerr = true,		.skip_onerr = true,
	.cant_stop = true,		.cant_stop = true,
	},		},
			/* Kicks the plugged cpu into life */
	[CPUHP_BRINGUP_CPU] = {		[CPUHP_BRINGUP_CPU] = {
	.name = "cpu:bringup",		.name = "cpu:bringup",
	.startup = bringup_cpu,		.startup = bringup_cpu,
	.teardown = NULL,		.teardown = NULL,
	.cant_stop = true,		.cant_stop = true,
	},		},
			/*
			* Handled on controll processor until the plugged processor manages
			* this itself.
			*/
	[CPUHP_TEARDOWN_CPU] = {		[CPUHP_TEARDOWN_CPU] = {
	.name = "cpu:teardown",		.name = "cpu:teardown",
	.startup = NULL,		.startup = NULL,
	@@ -1197,6 +1206,23 @@ static struct cpuhp_step cpuhp_bp_states[] = {
	/* Application processor state steps */		/* Application processor state steps */
	static struct cpuhp_step cpuhp_ap_states[] = {		static struct cpuhp_step cpuhp_ap_states[] = {
	#ifdef CONFIG_SMP		#ifdef CONFIG_SMP
			/* Final state before CPU kills itself */
			[CPUHP_AP_IDLE_DEAD] = {
			.name = "idle:dead",
			},
			/*
			* Last state before CPU enters the idle loop to die. Transient state
			* for synchronization.
			*/
			[CPUHP_AP_OFFLINE] = {
			.name = "ap:offline",
			.cant_stop = true,
			},
			/*
			* Low level startup/teardown notifiers. Run with interrupts
			* disabled. Will be removed once the notifiers are converted to
			* states.
			*/
	[CPUHP_AP_NOTIFY_STARTING] = {		[CPUHP_AP_NOTIFY_STARTING] = {
	.name = "notify:starting",		.name = "notify:starting",
	.startup = notify_starting,		.startup = notify_starting,
	@@ -1204,17 +1230,32 @@ static struct cpuhp_step cpuhp_ap_states[] = {
	.skip_onerr = true,		.skip_onerr = true,
	.cant_stop = true,		.cant_stop = true,
	},		},
			/* Entry state on starting. Interrupts enabled from here on. Transient
			* state for synchronsization */
			[CPUHP_AP_ONLINE] = {
			.name = "ap:online",
			},
			/* Handle smpboot threads park/unpark */
	[CPUHP_AP_SMPBOOT_THREADS] = {		[CPUHP_AP_SMPBOOT_THREADS] = {
	.name = "smpboot:threads",		.name = "smpboot:threads",
	.startup = smpboot_unpark_threads,		.startup = smpboot_unpark_threads,
	.teardown = NULL,		.teardown = NULL,
	},		},
			/*
			* Online/down_prepare notifiers. Will be removed once the notifiers
			* are converted to states.
			*/
	[CPUHP_AP_NOTIFY_ONLINE] = {		[CPUHP_AP_NOTIFY_ONLINE] = {
	.name = "notify:online",		.name = "notify:online",
	.startup = notify_online,		.startup = notify_online,
	.teardown = notify_down_prepare,		.teardown = notify_down_prepare,
	},		},
	#endif		#endif
			/*
			* The dynamically registered state space is here
			*/

			/* CPU is fully up and running. */
	[CPUHP_ONLINE] = {		[CPUHP_ONLINE] = {
	.name = "online",		.name = "online",
	.startup = NULL,		.startup = NULL,
	@@ -1232,7 +1273,11 @@ static int cpuhp_cb_check(enum cpuhp_state state)

	static bool cpuhp_is_ap_state(enum cpuhp_state state)		static bool cpuhp_is_ap_state(enum cpuhp_state state)
	{		{
	return state > CPUHP_BRINGUP_CPU;		/*
			* The extra check for CPUHP_TEARDOWN_CPU is only for documentation
			* purposes as that state is handled explicitely in cpu_down.
			*/
			return state > CPUHP_BRINGUP_CPU && state != CPUHP_TEARDOWN_CPU;
	}		}

	static struct cpuhp_step *cpuhp_get_step(enum cpuhp_state state)		static struct cpuhp_step *cpuhp_get_step(enum cpuhp_state state)