516 lines
16 KiB
C
516 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CPUHOTPLUG_H
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#define __CPUHOTPLUG_H
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#include <linux/types.h>
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/*
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* CPU-up CPU-down
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*
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* BP AP BP AP
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*
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* OFFLINE OFFLINE
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* | ^
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* v |
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* BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead)
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* | AP_OFFLINE
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* v (IRQ-off) ,---------------^
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* AP_ONLNE | (stop_machine)
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* | TEARDOWN_CPU <- AP_ONLINE_IDLE
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* | ^
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* v |
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* AP_ACTIVE AP_ACTIVE
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*/
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/*
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* CPU hotplug states. The state machine invokes the installed state
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* startup callbacks sequentially from CPUHP_OFFLINE + 1 to CPUHP_ONLINE
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* during a CPU online operation. During a CPU offline operation the
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* installed teardown callbacks are invoked in the reverse order from
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* CPU_ONLINE - 1 down to CPUHP_OFFLINE.
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*
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* The state space has three sections: PREPARE, STARTING and ONLINE.
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*
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* PREPARE: The callbacks are invoked on a control CPU before the
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* hotplugged CPU is started up or after the hotplugged CPU has died.
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*
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* STARTING: The callbacks are invoked on the hotplugged CPU from the low level
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* hotplug startup/teardown code with interrupts disabled.
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*
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* ONLINE: The callbacks are invoked on the hotplugged CPU from the per CPU
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* hotplug thread with interrupts and preemption enabled.
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*
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* Adding explicit states to this enum is only necessary when:
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*
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* 1) The state is within the STARTING section
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*
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* 2) The state has ordering constraints vs. other states in the
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* same section.
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*
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* If neither #1 nor #2 apply, please use the dynamic state space when
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* setting up a state by using CPUHP_PREPARE_DYN or CPUHP_PREPARE_ONLINE
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* for the @state argument of the setup function.
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*
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* See Documentation/core-api/cpu_hotplug.rst for further information and
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* examples.
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*/
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enum cpuhp_state {
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CPUHP_INVALID = -1,
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/* PREPARE section invoked on a control CPU */
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CPUHP_OFFLINE = 0,
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CPUHP_CREATE_THREADS,
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CPUHP_PERF_PREPARE,
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CPUHP_PERF_X86_PREPARE,
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CPUHP_PERF_X86_AMD_UNCORE_PREP,
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CPUHP_PERF_POWER,
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CPUHP_PERF_SUPERH,
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CPUHP_X86_HPET_DEAD,
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CPUHP_X86_APB_DEAD,
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CPUHP_X86_MCE_DEAD,
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CPUHP_VIRT_NET_DEAD,
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CPUHP_SLUB_DEAD,
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CPUHP_DEBUG_OBJ_DEAD,
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CPUHP_MM_WRITEBACK_DEAD,
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/* Must be after CPUHP_MM_VMSTAT_DEAD */
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CPUHP_MM_DEMOTION_DEAD,
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CPUHP_MM_VMSTAT_DEAD,
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CPUHP_SOFTIRQ_DEAD,
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CPUHP_NET_MVNETA_DEAD,
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CPUHP_CPUIDLE_DEAD,
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CPUHP_ARM64_FPSIMD_DEAD,
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CPUHP_ARM_OMAP_WAKE_DEAD,
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CPUHP_IRQ_POLL_DEAD,
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CPUHP_BLOCK_SOFTIRQ_DEAD,
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CPUHP_BIO_DEAD,
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CPUHP_ACPI_CPUDRV_DEAD,
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CPUHP_S390_PFAULT_DEAD,
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CPUHP_BLK_MQ_DEAD,
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CPUHP_FS_BUFF_DEAD,
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CPUHP_PRINTK_DEAD,
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CPUHP_MM_MEMCQ_DEAD,
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CPUHP_XFS_DEAD,
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CPUHP_PERCPU_CNT_DEAD,
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CPUHP_RADIX_DEAD,
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CPUHP_PAGE_ALLOC,
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CPUHP_NET_DEV_DEAD,
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CPUHP_PCI_XGENE_DEAD,
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CPUHP_IOMMU_IOVA_DEAD,
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CPUHP_LUSTRE_CFS_DEAD,
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CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
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CPUHP_PADATA_DEAD,
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CPUHP_AP_DTPM_CPU_DEAD,
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CPUHP_WORKQUEUE_PREP,
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CPUHP_POWER_NUMA_PREPARE,
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CPUHP_HRTIMERS_PREPARE,
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CPUHP_PROFILE_PREPARE,
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CPUHP_X2APIC_PREPARE,
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CPUHP_SMPCFD_PREPARE,
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CPUHP_RELAY_PREPARE,
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CPUHP_SLAB_PREPARE,
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CPUHP_MD_RAID5_PREPARE,
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CPUHP_RCUTREE_PREP,
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CPUHP_CPUIDLE_COUPLED_PREPARE,
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CPUHP_POWERPC_PMAC_PREPARE,
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CPUHP_POWERPC_MMU_CTX_PREPARE,
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CPUHP_XEN_PREPARE,
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CPUHP_XEN_EVTCHN_PREPARE,
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CPUHP_ARM_SHMOBILE_SCU_PREPARE,
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CPUHP_SH_SH3X_PREPARE,
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CPUHP_NET_FLOW_PREPARE,
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CPUHP_TOPOLOGY_PREPARE,
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CPUHP_NET_IUCV_PREPARE,
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CPUHP_ARM_BL_PREPARE,
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CPUHP_TRACE_RB_PREPARE,
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CPUHP_MM_ZS_PREPARE,
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CPUHP_MM_ZSWP_MEM_PREPARE,
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CPUHP_MM_ZSWP_POOL_PREPARE,
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CPUHP_KVM_PPC_BOOK3S_PREPARE,
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CPUHP_ZCOMP_PREPARE,
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CPUHP_TIMERS_PREPARE,
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CPUHP_MIPS_SOC_PREPARE,
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CPUHP_BP_PREPARE_DYN,
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CPUHP_BP_PREPARE_DYN_END = CPUHP_BP_PREPARE_DYN + 20,
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CPUHP_BRINGUP_CPU,
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/*
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* STARTING section invoked on the hotplugged CPU in low level
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* bringup and teardown code.
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*/
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CPUHP_AP_IDLE_DEAD,
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CPUHP_AP_OFFLINE,
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CPUHP_AP_SCHED_STARTING,
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CPUHP_AP_RCUTREE_DYING,
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CPUHP_AP_CPU_PM_STARTING,
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CPUHP_AP_IRQ_GIC_STARTING,
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CPUHP_AP_IRQ_HIP04_STARTING,
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CPUHP_AP_IRQ_APPLE_AIC_STARTING,
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CPUHP_AP_IRQ_ARMADA_XP_STARTING,
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CPUHP_AP_IRQ_BCM2836_STARTING,
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CPUHP_AP_IRQ_MIPS_GIC_STARTING,
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CPUHP_AP_IRQ_RISCV_STARTING,
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CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
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CPUHP_AP_ARM_MVEBU_COHERENCY,
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CPUHP_AP_MICROCODE_LOADER,
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CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
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CPUHP_AP_PERF_X86_STARTING,
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CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
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CPUHP_AP_PERF_X86_CQM_STARTING,
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CPUHP_AP_PERF_X86_CSTATE_STARTING,
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CPUHP_AP_PERF_XTENSA_STARTING,
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CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
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CPUHP_AP_ARM_SDEI_STARTING,
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CPUHP_AP_ARM_VFP_STARTING,
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CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
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CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,
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CPUHP_AP_PERF_ARM_ACPI_STARTING,
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CPUHP_AP_PERF_ARM_STARTING,
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CPUHP_AP_ARM_L2X0_STARTING,
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CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
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CPUHP_AP_ARM_ARCH_TIMER_STARTING,
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CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
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CPUHP_AP_JCORE_TIMER_STARTING,
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CPUHP_AP_ARM_TWD_STARTING,
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CPUHP_AP_QCOM_TIMER_STARTING,
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CPUHP_AP_TEGRA_TIMER_STARTING,
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CPUHP_AP_ARMADA_TIMER_STARTING,
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CPUHP_AP_MARCO_TIMER_STARTING,
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CPUHP_AP_MIPS_GIC_TIMER_STARTING,
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CPUHP_AP_ARC_TIMER_STARTING,
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CPUHP_AP_RISCV_TIMER_STARTING,
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CPUHP_AP_CLINT_TIMER_STARTING,
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CPUHP_AP_CSKY_TIMER_STARTING,
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CPUHP_AP_TI_GP_TIMER_STARTING,
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CPUHP_AP_HYPERV_TIMER_STARTING,
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CPUHP_AP_KVM_STARTING,
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CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
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CPUHP_AP_KVM_ARM_VGIC_STARTING,
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CPUHP_AP_KVM_ARM_TIMER_STARTING,
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/* Must be the last timer callback */
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CPUHP_AP_DUMMY_TIMER_STARTING,
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CPUHP_AP_ARM_XEN_STARTING,
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CPUHP_AP_ARM_CORESIGHT_STARTING,
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CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
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CPUHP_AP_ARM64_ISNDEP_STARTING,
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CPUHP_AP_SMPCFD_DYING,
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CPUHP_AP_X86_TBOOT_DYING,
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CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
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CPUHP_AP_ONLINE,
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CPUHP_TEARDOWN_CPU,
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/* Online section invoked on the hotplugged CPU from the hotplug thread */
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CPUHP_AP_ONLINE_IDLE,
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CPUHP_AP_SCHED_WAIT_EMPTY,
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CPUHP_AP_SMPBOOT_THREADS,
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CPUHP_AP_X86_VDSO_VMA_ONLINE,
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CPUHP_AP_IRQ_AFFINITY_ONLINE,
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CPUHP_AP_BLK_MQ_ONLINE,
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CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
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CPUHP_AP_X86_INTEL_EPB_ONLINE,
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CPUHP_AP_PERF_ONLINE,
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CPUHP_AP_PERF_X86_ONLINE,
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CPUHP_AP_PERF_X86_UNCORE_ONLINE,
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CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE,
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CPUHP_AP_PERF_X86_AMD_POWER_ONLINE,
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CPUHP_AP_PERF_X86_RAPL_ONLINE,
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CPUHP_AP_PERF_X86_CQM_ONLINE,
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CPUHP_AP_PERF_X86_CSTATE_ONLINE,
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CPUHP_AP_PERF_X86_IDXD_ONLINE,
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CPUHP_AP_PERF_S390_CF_ONLINE,
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CPUHP_AP_PERF_S390_SF_ONLINE,
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CPUHP_AP_PERF_ARM_CCI_ONLINE,
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CPUHP_AP_PERF_ARM_CCN_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_PA_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_SLLC_ONLINE,
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CPUHP_AP_PERF_ARM_HISI_PCIE_PMU_ONLINE,
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CPUHP_AP_PERF_ARM_L2X0_ONLINE,
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CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
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CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
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CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
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CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
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CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,
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CPUHP_AP_PERF_POWERPC_CORE_IMC_ONLINE,
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CPUHP_AP_PERF_POWERPC_THREAD_IMC_ONLINE,
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CPUHP_AP_PERF_POWERPC_TRACE_IMC_ONLINE,
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CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE,
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CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE,
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CPUHP_AP_PERF_CSKY_ONLINE,
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CPUHP_AP_WATCHDOG_ONLINE,
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CPUHP_AP_WORKQUEUE_ONLINE,
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CPUHP_AP_RCUTREE_ONLINE,
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CPUHP_AP_BASE_CACHEINFO_ONLINE,
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CPUHP_AP_ONLINE_DYN,
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CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
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/* Must be after CPUHP_AP_ONLINE_DYN for node_states[N_CPU] update */
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CPUHP_AP_MM_DEMOTION_ONLINE,
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CPUHP_AP_X86_HPET_ONLINE,
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CPUHP_AP_X86_KVM_CLK_ONLINE,
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CPUHP_AP_ACTIVE,
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CPUHP_ONLINE,
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};
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int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu), bool multi_instance);
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int __cpuhp_setup_state_cpuslocked(enum cpuhp_state state, const char *name,
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bool invoke,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu),
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bool multi_instance);
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/**
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* cpuhp_setup_state - Setup hotplug state callbacks with calling the @startup
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* callback
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* @state: The state for which the calls are installed
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* @name: Name of the callback (will be used in debug output)
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* @startup: startup callback function or NULL if not required
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* @teardown: teardown callback function or NULL if not required
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*
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* Installs the callback functions and invokes the @startup callback on
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* the online cpus which have already reached the @state.
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*/
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static inline int cpuhp_setup_state(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state(state, name, true, startup, teardown, false);
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}
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/**
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* cpuhp_setup_state_cpuslocked - Setup hotplug state callbacks with calling
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* @startup callback from a cpus_read_lock()
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* held region
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* @state: The state for which the calls are installed
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* @name: Name of the callback (will be used in debug output)
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* @startup: startup callback function or NULL if not required
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* @teardown: teardown callback function or NULL if not required
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*
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* Same as cpuhp_setup_state() except that it must be invoked from within a
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* cpus_read_lock() held region.
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*/
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static inline int cpuhp_setup_state_cpuslocked(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state_cpuslocked(state, name, true, startup,
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teardown, false);
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}
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/**
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* cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
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* @startup callback
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* @state: The state for which the calls are installed
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* @name: Name of the callback.
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* @startup: startup callback function or NULL if not required
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* @teardown: teardown callback function or NULL if not required
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*
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* Same as cpuhp_setup_state() except that the @startup callback is not
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* invoked during installation. NOP if SMP=n or HOTPLUG_CPU=n.
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*/
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static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state(state, name, false, startup, teardown,
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false);
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}
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/**
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* cpuhp_setup_state_nocalls_cpuslocked - Setup hotplug state callbacks without
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* invoking the @startup callback from
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* a cpus_read_lock() held region
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* callbacks
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* @state: The state for which the calls are installed
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* @name: Name of the callback.
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* @startup: startup callback function or NULL if not required
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* @teardown: teardown callback function or NULL if not required
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*
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* Same as cpuhp_setup_state_nocalls() except that it must be invoked from
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* within a cpus_read_lock() held region.
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*/
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static inline int cpuhp_setup_state_nocalls_cpuslocked(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state_cpuslocked(state, name, false, startup,
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teardown, false);
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}
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/**
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* cpuhp_setup_state_multi - Add callbacks for multi state
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* @state: The state for which the calls are installed
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* @name: Name of the callback.
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* @startup: startup callback function or NULL if not required
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* @teardown: teardown callback function or NULL if not required
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*
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* Sets the internal multi_instance flag and prepares a state to work as a multi
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* instance callback. No callbacks are invoked at this point. The callbacks are
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* invoked once an instance for this state are registered via
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* cpuhp_state_add_instance() or cpuhp_state_add_instance_nocalls()
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*/
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static inline int cpuhp_setup_state_multi(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu,
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struct hlist_node *node),
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int (*teardown)(unsigned int cpu,
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struct hlist_node *node))
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{
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return __cpuhp_setup_state(state, name, false,
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(void *) startup,
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(void *) teardown, true);
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}
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int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node,
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bool invoke);
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int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state,
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struct hlist_node *node, bool invoke);
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/**
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* cpuhp_state_add_instance - Add an instance for a state and invoke startup
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* callback.
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* @state: The state for which the instance is installed
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* @node: The node for this individual state.
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*
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* Installs the instance for the @state and invokes the registered startup
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* callback on the online cpus which have already reached the @state. The
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* @state must have been earlier marked as multi-instance by
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* cpuhp_setup_state_multi().
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*/
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static inline int cpuhp_state_add_instance(enum cpuhp_state state,
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struct hlist_node *node)
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{
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return __cpuhp_state_add_instance(state, node, true);
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}
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/**
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* cpuhp_state_add_instance_nocalls - Add an instance for a state without
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* invoking the startup callback.
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* @state: The state for which the instance is installed
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* @node: The node for this individual state.
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*
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* Installs the instance for the @state. The @state must have been earlier
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* marked as multi-instance by cpuhp_setup_state_multi. NOP if SMP=n or
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* HOTPLUG_CPU=n.
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*/
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static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
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struct hlist_node *node)
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{
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return __cpuhp_state_add_instance(state, node, false);
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}
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/**
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* cpuhp_state_add_instance_nocalls_cpuslocked - Add an instance for a state
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* without invoking the startup
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* callback from a cpus_read_lock()
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* held region.
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* @state: The state for which the instance is installed
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* @node: The node for this individual state.
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*
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* Same as cpuhp_state_add_instance_nocalls() except that it must be
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* invoked from within a cpus_read_lock() held region.
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*/
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static inline int
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cpuhp_state_add_instance_nocalls_cpuslocked(enum cpuhp_state state,
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struct hlist_node *node)
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{
|
|
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_SMP
|
|
void cpuhp_online_idle(enum cpuhp_state state);
|
|
#else
|
|
static inline void cpuhp_online_idle(enum cpuhp_state state) { }
|
|
#endif
|
|
|
|
#endif
|