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-rw-r--r--include/linux/cpuhotplug.h416
1 files changed, 416 insertions, 0 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
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index 000000000..f5a5df3a8
--- /dev/null
+++ b/include/linux/cpuhotplug.h
@@ -0,0 +1,416 @@
+/* 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
+ */
+
+enum cpuhp_state {
+ CPUHP_INVALID = -1,
+ 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_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_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_DEAD,
+ CPUHP_NET_DEV_DEAD,
+ CPUHP_PCI_XGENE_DEAD,
+ CPUHP_IOMMU_INTEL_DEAD,
+ CPUHP_LUSTRE_CFS_DEAD,
+ CPUHP_AP_ARM_CACHE_B15_RAC_DEAD,
+ CPUHP_PADATA_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_MEM_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_BRINGUP_CPU,
+ CPUHP_AP_IDLE_DEAD,
+ CPUHP_AP_OFFLINE,
+ 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_ARMADA_XP_STARTING,
+ CPUHP_AP_IRQ_BCM2836_STARTING,
+ CPUHP_AP_IRQ_MIPS_GIC_STARTING,
+ CPUHP_AP_IRQ_RISCV_STARTING,
+ CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
+ CPUHP_AP_ARM_MVEBU_COHERENCY,
+ CPUHP_AP_MICROCODE_LOADER,
+ CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING,
+ CPUHP_AP_PERF_X86_STARTING,
+ CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
+ CPUHP_AP_PERF_X86_CQM_STARTING,
+ CPUHP_AP_PERF_X86_CSTATE_STARTING,
+ CPUHP_AP_PERF_XTENSA_STARTING,
+ CPUHP_AP_MIPS_OP_LOONGSON3_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_ARM_L2X0_STARTING,
+ CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
+ CPUHP_AP_ARM_ARCH_TIMER_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_MARCO_TIMER_STARTING,
+ CPUHP_AP_MIPS_GIC_TIMER_STARTING,
+ CPUHP_AP_ARC_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,
+ CPUHP_AP_KVM_STARTING,
+ CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
+ CPUHP_AP_KVM_ARM_VGIC_STARTING,
+ CPUHP_AP_KVM_ARM_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_STARTING,
+ CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
+ CPUHP_AP_ARM64_ISNDEP_STARTING,
+ CPUHP_AP_SMPCFD_DYING,
+ CPUHP_AP_HRTIMERS_DYING,
+ CPUHP_AP_X86_TBOOT_DYING,
+ CPUHP_AP_ARM_CACHE_B15_RAC_DYING,
+ CPUHP_AP_ONLINE,
+ CPUHP_TEARDOWN_CPU,
+ CPUHP_AP_ONLINE_IDLE,
+ CPUHP_AP_SMPBOOT_THREADS,
+ CPUHP_AP_X86_VDSO_VMA_ONLINE,
+ CPUHP_AP_IRQ_AFFINITY_ONLINE,
+ CPUHP_AP_BLK_MQ_ONLINE,
+ CPUHP_AP_ARM_MVEBU_SYNC_CLOCKS,
+ 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_X86_RAPL_ONLINE,
+ CPUHP_AP_PERF_X86_CQM_ONLINE,
+ CPUHP_AP_PERF_X86_CSTATE_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_DDRC_ONLINE,
+ CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
+ CPUHP_AP_PERF_ARM_HISI_L3_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_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_WATCHDOG_ONLINE,
+ CPUHP_AP_WORKQUEUE_ONLINE,
+ CPUHP_AP_RANDOM_ONLINE,
+ CPUHP_AP_RCUTREE_ONLINE,
+ CPUHP_AP_BASE_CACHEINFO_ONLINE,
+ CPUHP_AP_ONLINE_DYN,
+ CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
+ 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 callbacks
+ * @state: The state for which the calls are installed
+ * @name: Name of the callback (will be used in debug output)
+ * @startup: startup callback function
+ * @teardown: teardown callback function
+ *
+ * Installs the callback functions and invokes the startup callback on
+ * the present 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);
+}
+
+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
+ * callbacks
+ * @state: The state for which the calls are installed
+ * @name: Name of the callback.
+ * @startup: startup callback function
+ * @teardown: teardown callback function
+ *
+ * Same as @cpuhp_setup_state except that no calls are executed are invoked
+ * during installation of this callback. 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);
+}
+
+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
+ * @teardown: teardown callback function
+ *
+ * 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 startup callback on
+ * the present 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.
+ */
+static inline int cpuhp_state_add_instance_nocalls(enum cpuhp_state state,
+ struct hlist_node *node)
+{
+ return __cpuhp_state_add_instance(state, node, false);
+}
+
+static inline int
+cpuhp_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 present 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
+ * teardown
+ * @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);
+}
+
+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 present cpus
+ * which have already reached the @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 reatdown 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