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     €БА„­ІЧїГВ ?ч     /* SPDX-License-Identifier: GPL-2.0 */
#ifndef __CPUHOTPLUG_H
#define __CPUHOTPLUG_H

#include <linux/types.h>

/*
 * CPU-up			CPU-down
 *
 * BP		AP		BP		AP
 *
 * OFFLINE			OFFLINE
 *   |				  ^
 *   v				  |
 * BRINGUP_CPU->AP_OFFLINE	BRINGUP_CPU  <- AP_IDLE_DEAD (idle thread/play_dead)
 *		  |				AP_OFFLINE
 *		  v (IRQ-off)	  ,---------------^
 *		AP_ONLNE	  | (stop_machine)
 *		  |		TEARDOWN_CPU <-	AP_ONLINE_IDLE
 *		  |				  ^
 *		  v				  |
 *              AP_ACTIVE			AP_ACTIVE
 */

/*
 * CPU hotplug states. The state machine invokes the installed state
 * startup callbacks sequentially from CPUHP_OFFLINE + 1 to CPUHP_ONLINE
 * during a CPU online operation. During a CPU offline operation the
 * installed teardown callbacks are invoked in the reverse order from
 * CPU_ONLINE - 1 down to CPUHP_OFFLINE.
 *
 * The state space has three sections: PREPARE, STARTING and ONLINE.
 *
 * PREPARE: The callbacks are invoked on a control CPU before the
 * hotplugged CPU is started up or after the hotplugged CPU has died.
 *
 * STARTING: The callbacks are invoked on the hotplugged CPU from the low level
 * hotplug startup/teardown code with interrupts disabled.
 *
 * ONLINE: The callbacks are invoked on the hotplugged CPU from the per CPU
 * hotplug thread with interrupts and preemption enabled.
 *
 * Adding explicit states to this enum is only necessary when:
 *
 * 1) The state is within the STARTING section
 *
 * 2) The state has ordering constraints vs. other states in the
 *    same section.
 *
 * If neither #1 nor #2 apply, please use the dynamic state space when
 * setting up a state by using CPUHP_PREPARE_DYN or CPUHP_PREPARE_ONLINE
 * for the @state argument of the setup function.
 *
 * See Documentation/core-api/cpu_hotplug.rst for further information and
 * examples.
 */
enum cpuhp_state {
	CPUHP_INVALID = -1,

	/* PREPARE section invoked on a control CPU */
	CPUHP_OFFLINE = 0,
	CPUHP_CREATE_THREADS,
	CPUHP_PERF_PREPARE,
	CPUHP_PERF_X86_PREPARE,
	CPUHP_PERF_X86_AMD_UNCORE_PREP,
	CPUHP_PERF_POWER,
	CPUHP_PERF_SUPERH,
	CPUHP_X86_HPET_DEAD,
	CPUHP_X86_APB_DEAD,
	CPUHP_X86_MCE_DEAD,
	CPUHP_VIRT_NET_DEAD,
	CPUHP_IBMVNIC_DEAD,
	CPUHP_SLUB_DEAD,
	CPUHP_DEBUG_OBJ_DEAD,
	CPUHP_MM_WRITEBACK_DEAD,
	/* Must be after CPUHP_MM_VMSTAT_DEAD */
	CPUHP_MM_DEMOTION_DEAD,
	CPUHP_MM_VMSTAT_DEAD,
	CPUHP_SOFTIRQ_DEAD,
	CPUHP_NET_MVNETA_DEAD,
	CPUHP_CPUIDLE_DEAD,
	CPUHP_ARM64_FPSIMD_DEAD,
	CPUHP_ARM_OMAP_WAKE_DEAD,
	CPUHP_IRQ_POLL_DEAD,
	CPUHP_BLOCK_SOFTIRQ_DEAD,
	CPUHP_BIO_DEAD,
	CPUHP_ACPI_CPUDRV_DEAD,
	CPUHP_S390_PFAULT_DEAD,
	CPUHP_BLK_MQ_DEAD,
	CPUHP_FS_BUFF_DEAD,
	CPUHP_PRINTK_DEAD,
	CPUHP_MM_MEMCQ_DEAD,
	CPUHP_PERCPU_CNT_DEAD,
	CPUHP_RADIX_DEAD,
	CPUHP_PAGE_ALLOC,
	CPUHP_NET_DEV_DEAD,
	CPUHP_PCI_XGENE_DEAD,
	CPUHP_IOMMU_IOVA_DEAD,
	CPUHP_LUSTRE_CFS_DEAD,
	CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
	CPUHP_PADATA_DEAD,
	CPUHP_AP_DTPM_CPU_DEAD,
	CPUHP_RANDOM_PREPARE,
	CPUHP_WORKQUEUE_PREP,
	CPUHP_POWER_NUMA_PREPARE,
	CPUHP_HRTIMERS_PREPARE,
	CPUHP_PROFILE_PREPARE,
	CPUHP_X2APIC_PREPARE,
	CPUHP_SMPCFD_PREPARE,
	CPUHP_RELAY_PREPARE,
	CPUHP_SLAB_PREPARE,
	CPUHP_MD_RAID5_PREPARE,
	CPUHP_RCUTREE_PREP,
	CPUHP_CPUIDLE_COUPLED_PREPARE,
	CPUHP_POWERPC_PMAC_PREPARE,
	CPUHP_POWERPC_MMU_CTX_PREPARE,
	CPUHP_XEN_PREPARE,
	CPUHP_XEN_EVTCHN_PREPARE,
	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
	CPUHP_SH_SH3X_PREPARE,
	CPUHP_NET_FLOW_PREPARE,
	CPUHP_TOPOLOGY_PREPARE,
	CPUHP_NET_IUCV_PREPARE,
	CPUHP_ARM_BL_PREPARE,
	CPUHP_TRACE_RB_PREPARE,
	CPUHP_MM_ZS_PREPARE,
	CPUHP_MM_ZSWP_POOL_PREPARE,
	CPUHP_KVM_PPC_BOOK3S_PREPARE,
	CPUHP_ZCOMP_PREPARE,
	CPUHP_TIMERS_PREPARE,
	CPUHP_MIPS_SOC_PREPARE,
	CPUHP_BP_PREPARE_DYN,
	CPUHP_BP_PREPARE_DYN_END		= CPUHP_BP_PREPARE_DYN + 20,
	CPUHP_BP_KICK_AP,
	CPUHP_BRINGUP_CPU,

	/*
	 * STARTING section invoked on the hotplugged CPU in low level
	 * bringup and teardown code.
	 */
	CPUHP_AP_IDLE_DEAD,
	CPUHP_AP_OFFLINE,
	CPUHP_AP_HYPERV_FORCE_EFER_WRITE,
	CPUHP_AP_CACHECTRL_STARTING,
	CPUHP_AP_SCHED_STARTING,
	CPUHP_AP_RCUTREE_DYING,
	CPUHP_AP_CPU_PM_STARTING,
	CPUHP_AP_IRQ_GIC_STARTING,
	CPUHP_AP_IRQ_HIP04_STARTING,