Something went wrong. Try again.
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527/* 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 * CPUHP_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_BP_PREPARE_DYN or CPUHP_AP_ONLINE_DYN * 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_X86_PREPARE, CPUHP_PERF_X86_AMD_UNCORE_PREP, CPUHP_PERF_POWER, CPUHP_PERF_SUPERH, CPUHP_X86_HPET_DEAD, CPUHP_X86_MCE_DEAD, CPUHP_VIRT_NET_DEAD, CPUHP_IBMVNIC_DEAD, CPUHP_SLUB_DEAD, CPUHP_DEBUG_OBJ_DEAD, CPUHP_MM_WRITEBACK_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_IOMMU_IOVA_DEAD, CPUHP_AP_ARM_CACHE_B15_RAC_DEAD, CPUHP_AP_DTPM_CPU_DEAD, CPUHP_RANDOM_PREPARE, CPUHP_WORKQUEUE_PREP, CPUHP_POWER_NUMA_PREPARE, CPUHP_HRTIMERS_PREPARE, CPUHP_X2APIC_PREPARE, CPUHP_SMPCFD_PREPARE, CPUHP_RELAY_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_TOPOLOGY_PREPARE, CPUHP_NET_IUCV_PREPARE, CPUHP_ARM_BL_PREPARE, CPUHP_TRACE_RB_PREPARE, CPUHP_MM_ZSWP_POOL_PREPARE, CPUHP_KVM_PPC_BOOK3S_PREPARE, CPUHP_ZCOMP_PREPARE, CPUHP_TIMERS_PREPARE, CPUHP_TMIGR_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_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, CPUHP_AP_IRQ_APPLE_AIC_STARTING, CPUHP_AP_IRQ_ARMADA_XP_STARTING, CPUHP_AP_IRQ_BCM2836_STARTING, CPUHP_AP_IRQ_MIPS_GIC_STARTING, CPUHP_AP_IRQ_EIOINTC_STARTING, CPUHP_AP_IRQ_AVECINTC_STARTING, CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING, CPUHP_AP_IRQ_ACLINT_SSWI_STARTING, CPUHP_AP_IRQ_RISCV_IMSIC_STARTING, CPUHP_AP_IRQ_RISCV_SBI_IPI_STARTING, CPUHP_AP_ARM_MVEBU_COHERENCY, CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING, CPUHP_AP_PERF_X86_STARTING, CPUHP_AP_PERF_X86_AMD_IBS_STARTING, CPUHP_AP_PERF_XTENSA_STARTING, CPUHP_AP_ARM_VFP_STARTING, CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING, CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING, CPUHP_AP_PERF_ARM_ACPI_STARTING, CPUHP_AP_PERF_ARM_STARTING, CPUHP_AP_PERF_RISCV_STARTING, CPUHP_AP_ARM_L2X0_STARTING, CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING, CPUHP_AP_ARM_ARCH_TIMER_STARTING, CPUHP_AP_ARM_ARCH_TIMER_EVTSTRM_STARTING, CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, CPUHP_AP_JCORE_TIMER_STARTING, CPUHP_AP_ARM_TWD_STARTING, CPUHP_AP_QCOM_TIMER_STARTING, CPUHP_AP_TEGRA_TIMER_STARTING, CPUHP_AP_ARMADA_TIMER_STARTING, CPUHP_AP_LOONGARCH_ARCH_TIMER_STARTING, CPUHP_AP_MIPS_GIC_TIMER_STARTING, CPUHP_AP_ARC_TIMER_STARTING, CPUHP_AP_REALTEK_TIMER_STARTING, CPUHP_AP_RISCV_TIMER_STARTING, CPUHP_AP_CLINT_TIMER_STARTING, CPUHP_AP_CSKY_TIMER_STARTING, CPUHP_AP_TI_GP_TIMER_STARTING, CPUHP_AP_HYPERV_TIMER_STARTING, /* Must be the last timer callback */ CPUHP_AP_DUMMY_TIMER_STARTING, CPUHP_AP_ARM_XEN_STARTING, CPUHP_AP_ARM_XEN_RUNSTATE_STARTING, CPUHP_AP_ARM_CORESIGHT_CTI_STARTING, CPUHP_AP_ARM64_ISNDEP_STARTING, CPUHP_AP_SMPCFD_DYING, CPUHP_AP_HRTIMERS_DYING, CPUHP_AP_TICK_DYING, CPUHP_AP_X86_TBOOT_DYING, CPUHP_AP_ARM_CACHE_B15_RAC_DYING, CPUHP_AP_ONLINE, CPUHP_TEARDOWN_CPU,
/* Online section invoked on the hotplugged CPU from the hotplug thread */ CPUHP_AP_ONLINE_IDLE, CPUHP_AP_HYPERV_ONLINE, CPUHP_AP_KVM_ONLINE, CPUHP_AP_SCHED_WAIT_EMPTY, CPUHP_AP_SMPBOOT_THREADS, CPUHP_AP_IRQ_AFFINITY_ONLINE, CPUHP_AP_BLK_MQ_ONLINE, CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS, CPUHP_AP_ARM_CORESIGHT_ONLINE, CPUHP_AP_X86_INTEL_EPB_ONLINE, CPUHP_AP_PERF_ONLINE, CPUHP_AP_PERF_X86_ONLINE, CPUHP_AP_PERF_X86_UNCORE_ONLINE, CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE, CPUHP_AP_PERF_X86_AMD_POWER_ONLINE, CPUHP_AP_PERF_S390_CF_ONLINE, CPUHP_AP_PERF_S390_SF_ONLINE, CPUHP_AP_PERF_ARM_CCI_ONLINE, CPUHP_AP_PERF_ARM_CCN_ONLINE, CPUHP_AP_PERF_ARM_HISI_CPA_ONLINE, CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE, CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE, CPUHP_AP_PERF_ARM_HISI_L3_ONLINE, CPUHP_AP_PERF_ARM_HISI_PA_ONLINE, CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE, CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE, CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE, CPUHP_AP_PERF_ARM_L2X0_ONLINE, CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE, CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE, CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE, CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE, CPUHP_AP_PERF_ARM_MARVELL_CN10K_DDR_ONLINE, CPUHP_AP_PERF_ARM_MRVL_PEM_ONLINE, CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE, CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE, CPUHP_AP_PERF_CSKY_ONLINE, CPUHP_AP_TMIGR_ONLINE, CPUHP_AP_WATCHDOG_ONLINE, CPUHP_AP_WORKQUEUE_ONLINE, CPUHP_AP_RANDOM_ONLINE, CPUHP_AP_RCUTREE_ONLINE, CPUHP_AP_KTHREADS_ONLINE, CPUHP_AP_BASE_CACHEINFO_ONLINE, CPUHP_AP_ONLINE_DYN, CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 40, CPUHP_AP_X86_HPET_ONLINE, CPUHP_AP_X86_KVM_CLK_ONLINE, CPUHP_AP_ACTIVE, CPUHP_ONLINE,};
int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu), bool multi_instance);
int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, bool invoke, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu), bool multi_instance);/** * cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup * callback * @state: The state for which the calls are installed * @name: Name of the callback (will be used in debug output) * @startup: startup callback function or NULL if not required * @teardown: teardown callback function or NULL if not required * * Installs the callback functions and invokes the @startup callback on * the online cpus which have already reached the @state. */static inline int cpuhp_setup_state(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)){ return __cpuhp_setup_state(state, name, true, startup, teardown, false);}
/** * cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling * @startup callback from a cpus_read_lock() * held region * @state: The state for which the calls are installed * @name: Name of the callback (will be used in debug output) * @startup: startup callback function or NULL if not required * @teardown: teardown callback function or NULL if not required * * Same as cpuhp_setup_state() except that it must be invoked from within a * cpus_read_lock() held region. */static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)){ return __cpuhp_setup_state_cpuslocked(state, name, true, startup, teardown, false);}
/** * cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the * @startup callback * @state: The state for which the calls are installed * @name: Name of the callback. * @startup: startup callback function or NULL if not required * @teardown: teardown callback function or NULL if not required * * Same as cpuhp_setup_state() except that the @startup callback is not * invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n. */static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)){ return __cpuhp_setup_state(state, name, false, startup, teardown, false);}
/** * cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without * invoking the @startup callback from * a cpus_read_lock() held region * callbacks * @state: The state for which the calls are installed * @name: Name of the callback. * @startup: startup callback function or NULL if not required * @teardown: teardown callback function or NULL if not required * * Same as cpuhp_setup_state_nocalls() except that it must be invoked from * within a cpus_read_lock() held region. */static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu)){ return __cpuhp_setup_state_cpuslocked(state, name, false, startup, teardown, false);}
/** * cpuhp_setup_state_multi - Add callbacks for multi state * @state: The state for which the calls are installed * @name: Name of the callback. * @startup: startup callback function or NULL if not required * @teardown: teardown callback function or NULL if not required * * Sets the internal multi_instance flag and prepares a state to work as a multi * instance callback. No callbacks are invoked at this point. The callbacks are * invoked once an instance for this state are registered via * cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls() */static inline int cpuhp_setup_state_multi(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu, struct hlist_node *node), int (*teardown)(unsigned int cpu, struct hlist_node *node)){ return __cpuhp_setup_state(state, name, false, (void *) startup, (void *) teardown, true);}
int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke);int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, struct hlist_node *node, bool invoke);
/** * cpuhp_state_add_instance - Add an instance for a state and invoke startup * callback. * @state: The state for which the instance is installed * @node: The node for this individual state. * * Installs the instance for the @state and invokes the registered startup * callback on the online cpus which have already reached the @state. The * @state must have been earlier marked as multi-instance by * cpuhp_setup_state_multi(). */static inline int cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node){ return __cpuhp_state_add_instance(state, node, true);}
/** * cpuhp_state_add_instance_nocalls - Add an instance for a state without * invoking the startup callback. * @state: The state for which the instance is installed * @node: The node for this individual state. * * Installs the instance for the @state. The @state must have been earlier * marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or * HOTPLUG_CPU=n. */static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state, struct hlist_node *node){ return __cpuhp_state_add_instance(state, node, false);}
/** * cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state * without invoking the startup * callback from a cpus_read_lock() * held region. * @state: The state for which the instance is installed * @node: The node for this individual state. * * Same as cpuhp_state_add_instance_nocalls() except that it must be * invoked from within a cpus_read_lock() held region. */static inline intcpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state, struct hlist_node *node){ return __cpuhp_state_add_instance_cpuslocked(state, node, false);}
void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke);
/** * cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown * @state: The state for which the calls are removed * * Removes the callback functions and invokes the teardown callback on * the online cpus which have already reached the @state. */static inline void cpuhp_remove_state(enum cpuhp_state state){ __cpuhp_remove_state(state, true);}
/** * cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking * the teardown callback * @state: The state for which the calls are removed */static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state){ __cpuhp_remove_state(state, false);}
/** * cpuhp_remove_state_nocalls_cpuslocked - Remove hotplug state callbacks without invoking * teardown from a cpus_read_lock() held region. * @state: The state for which the calls are removed * * Same as cpuhp_remove_state nocalls() except that it must be invoked * from within a cpus_read_lock() held region. */static inline void cpuhp_remove_state_nocalls_cpuslocked(enum cpuhp_state state){ __cpuhp_remove_state_cpuslocked(state, false);}
/** * cpuhp_remove_multi_state - Remove hotplug multi state callback * @state: The state for which the calls are removed * * Removes the callback functions from a multi state. This is the reverse of * cpuhp_setup_state_multi(). All instances should have been removed before * invoking this function. */static inline void cpuhp_remove_multi_state(enum cpuhp_state state){ __cpuhp_remove_state(state, false);}
int __cpuhp_state_remove_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke);
/** * cpuhp_state_remove_instance - Remove hotplug instance from state and invoke * the teardown callback * @state: The state from which the instance is removed * @node: The node for this individual state. * * Removes the instance and invokes the teardown callback on the online cpus * which have already reached @state. */static inline int cpuhp_state_remove_instance(enum cpuhp_state state, struct hlist_node *node){ return __cpuhp_state_remove_instance(state, node, true);}
/** * cpuhp_state_remove_instance_nocalls - Remove hotplug instance from state * without invoking the teardown callback * @state: The state from which the instance is removed * @node: The node for this individual state. * * Removes the instance without invoking the teardown callback. */static inline int cpuhp_state_remove_instance_nocalls(enum cpuhp_state state, struct hlist_node *node){ return __cpuhp_state_remove_instance(state, node, false);}
#ifdef CONFIG_SMPvoid cpuhp_online_idle(enum cpuhp_state state);#elsestatic inline void cpuhp_online_idle(enum cpuhp_state state) { }#endif
struct task_struct;
void cpuhp_ap_sync_alive(void);void arch_cpuhp_sync_state_poll(void);void arch_cpuhp_cleanup_kick_cpu(unsigned int cpu);int arch_cpuhp_kick_ap_alive(unsigned int cpu, struct task_struct *tidle);bool arch_cpuhp_init_parallel_bringup(void);
#ifdef CONFIG_HOTPLUG_CORE_SYNC_DEADvoid cpuhp_ap_report_dead(void);void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu);#elsestatic inline void cpuhp_ap_report_dead(void) { }static inline void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu) { }#endif
#endif