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kernel/cpu.c
47.4 KB
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/* CPU control. * (C) 2001, 2002, 2003, 2004 Rusty Russell * * This code is licenced under the GPL. */ #include <linux/proc_fs.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/notifier.h> #include <linux/sched.h> #include <linux/unistd.h> #include <linux/cpu.h> |
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#include <linux/oom.h> #include <linux/rcupdate.h> |
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#include <linux/export.h> |
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#include <linux/bug.h> |
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#include <linux/kthread.h> #include <linux/stop_machine.h> |
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#include <linux/mutex.h> |
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#include <linux/gfp.h> |
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#include <linux/suspend.h> |
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#include <linux/lockdep.h> |
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#include <linux/tick.h> |
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#include <linux/irq.h> |
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#include <linux/smpboot.h> |
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#include <linux/relay.h> |
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#include <linux/slab.h> |
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#include <trace/events/power.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/cpuhp.h> |
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|
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#include "smpboot.h" |
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/** * cpuhp_cpu_state - Per cpu hotplug state storage * @state: The current cpu state * @target: The target state |
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* @thread: Pointer to the hotplug thread * @should_run: Thread should execute |
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* @rollback: Perform a rollback |
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* @single: Single callback invocation * @bringup: Single callback bringup or teardown selector * @cb_state: The state for a single callback (install/uninstall) |
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* @result: Result of the operation * @done: Signal completion to the issuer of the task |
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*/ struct cpuhp_cpu_state { enum cpuhp_state state; enum cpuhp_state target; |
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#ifdef CONFIG_SMP struct task_struct *thread; bool should_run; |
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bool rollback; |
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bool single; bool bringup; |
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struct hlist_node *node; |
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enum cpuhp_state cb_state; |
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int result; struct completion done; #endif |
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}; static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state); /** * cpuhp_step - Hotplug state machine step * @name: Name of the step * @startup: Startup function of the step * @teardown: Teardown function of the step * @skip_onerr: Do not invoke the functions on error rollback * Will go away once the notifiers are gone |
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* @cant_stop: Bringup/teardown can't be stopped at this step |
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*/ struct cpuhp_step { |
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const char *name; union { |
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int (*single)(unsigned int cpu); int (*multi)(unsigned int cpu, struct hlist_node *node); } startup; |
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union { |
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int (*single)(unsigned int cpu); int (*multi)(unsigned int cpu, struct hlist_node *node); } teardown; |
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struct hlist_head list; bool skip_onerr; bool cant_stop; bool multi_instance; |
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}; |
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static DEFINE_MUTEX(cpuhp_state_mutex); |
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static struct cpuhp_step cpuhp_bp_states[]; |
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static struct cpuhp_step cpuhp_ap_states[]; |
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static bool cpuhp_is_ap_state(enum cpuhp_state state) { /* * The extra check for CPUHP_TEARDOWN_CPU is only for documentation * purposes as that state is handled explicitly in cpu_down. */ return state > CPUHP_BRINGUP_CPU && state != CPUHP_TEARDOWN_CPU; } static struct cpuhp_step *cpuhp_get_step(enum cpuhp_state state) { struct cpuhp_step *sp; sp = cpuhp_is_ap_state(state) ? cpuhp_ap_states : cpuhp_bp_states; return sp + state; } |
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/** * cpuhp_invoke_callback _ Invoke the callbacks for a given state * @cpu: The cpu for which the callback should be invoked * @step: The step in the state machine |
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* @bringup: True if the bringup callback should be invoked |
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* |
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* Called from cpu hotplug and from the state register machinery. |
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*/ |
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static int cpuhp_invoke_callback(unsigned int cpu, enum cpuhp_state state, |
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bool bringup, struct hlist_node *node) |
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{ struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
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struct cpuhp_step *step = cpuhp_get_step(state); |
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int (*cbm)(unsigned int cpu, struct hlist_node *node); int (*cb)(unsigned int cpu); int ret, cnt; if (!step->multi_instance) { |
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cb = bringup ? step->startup.single : step->teardown.single; |
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if (!cb) return 0; |
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trace_cpuhp_enter(cpu, st->target, state, cb); |
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ret = cb(cpu); |
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trace_cpuhp_exit(cpu, st->state, state, ret); |
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return ret; } |
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cbm = bringup ? step->startup.multi : step->teardown.multi; |
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if (!cbm) return 0; /* Single invocation for instance add/remove */ if (node) { trace_cpuhp_multi_enter(cpu, st->target, state, cbm, node); ret = cbm(cpu, node); trace_cpuhp_exit(cpu, st->state, state, ret); return ret; } /* State transition. Invoke on all instances */ cnt = 0; hlist_for_each(node, &step->list) { trace_cpuhp_multi_enter(cpu, st->target, state, cbm, node); ret = cbm(cpu, node); trace_cpuhp_exit(cpu, st->state, state, ret); if (ret) goto err; cnt++; } return 0; err: /* Rollback the instances if one failed */ |
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cbm = !bringup ? step->startup.multi : step->teardown.multi; |
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if (!cbm) return ret; hlist_for_each(node, &step->list) { if (!cnt--) break; cbm(cpu, node); |
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} return ret; } |
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#ifdef CONFIG_SMP |
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/* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
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static DEFINE_MUTEX(cpu_add_remove_lock); |
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bool cpuhp_tasks_frozen; EXPORT_SYMBOL_GPL(cpuhp_tasks_frozen); |
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/* |
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* The following two APIs (cpu_maps_update_begin/done) must be used when * attempting to serialize the updates to cpu_online_mask & cpu_present_mask. * The APIs cpu_notifier_register_begin/done() must be used to protect CPU * hotplug callback (un)registration performed using __register_cpu_notifier() * or __unregister_cpu_notifier(). |
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*/ void cpu_maps_update_begin(void) { mutex_lock(&cpu_add_remove_lock); } |
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EXPORT_SYMBOL(cpu_notifier_register_begin); |
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void cpu_maps_update_done(void) { mutex_unlock(&cpu_add_remove_lock); } |
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EXPORT_SYMBOL(cpu_notifier_register_done); |
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static RAW_NOTIFIER_HEAD(cpu_chain); |
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/* If set, cpu_up and cpu_down will return -EBUSY and do nothing. * Should always be manipulated under cpu_add_remove_lock */ static int cpu_hotplug_disabled; |
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#ifdef CONFIG_HOTPLUG_CPU |
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static struct { struct task_struct *active_writer; |
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/* wait queue to wake up the active_writer */ wait_queue_head_t wq; /* verifies that no writer will get active while readers are active */ struct mutex lock; |
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/* * Also blocks the new readers during * an ongoing cpu hotplug operation. */ |
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atomic_t refcount; |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif |
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} cpu_hotplug = { .active_writer = NULL, |
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.wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq), |
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.lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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.dep_map = STATIC_LOCKDEP_MAP_INIT("cpu_hotplug.dep_map", &cpu_hotplug.dep_map), |
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#endif |
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}; |
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/* Lockdep annotations for get/put_online_cpus() and cpu_hotplug_begin/end() */ #define cpuhp_lock_acquire_read() lock_map_acquire_read(&cpu_hotplug.dep_map) |
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#define cpuhp_lock_acquire_tryread() \ lock_map_acquire_tryread(&cpu_hotplug.dep_map) |
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#define cpuhp_lock_acquire() lock_map_acquire(&cpu_hotplug.dep_map) #define cpuhp_lock_release() lock_map_release(&cpu_hotplug.dep_map) |
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void get_online_cpus(void) |
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{ |
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might_sleep(); if (cpu_hotplug.active_writer == current) |
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return; |
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cpuhp_lock_acquire_read(); |
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mutex_lock(&cpu_hotplug.lock); |
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atomic_inc(&cpu_hotplug.refcount); |
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mutex_unlock(&cpu_hotplug.lock); |
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} |
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EXPORT_SYMBOL_GPL(get_online_cpus); |
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void put_online_cpus(void) |
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{ |
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int refcount; |
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if (cpu_hotplug.active_writer == current) |
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return; |
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|
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refcount = atomic_dec_return(&cpu_hotplug.refcount); if (WARN_ON(refcount < 0)) /* try to fix things up */ atomic_inc(&cpu_hotplug.refcount); if (refcount <= 0 && waitqueue_active(&cpu_hotplug.wq)) wake_up(&cpu_hotplug.wq); |
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cpuhp_lock_release(); |
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} |
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EXPORT_SYMBOL_GPL(put_online_cpus); |
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/* * This ensures that the hotplug operation can begin only when the * refcount goes to zero. * * Note that during a cpu-hotplug operation, the new readers, if any, * will be blocked by the cpu_hotplug.lock * |
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* Since cpu_hotplug_begin() is always called after invoking * cpu_maps_update_begin(), we can be sure that only one writer is active. |
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* * Note that theoretically, there is a possibility of a livelock: * - Refcount goes to zero, last reader wakes up the sleeping * writer. * - Last reader unlocks the cpu_hotplug.lock. * - A new reader arrives at this moment, bumps up the refcount. * - The writer acquires the cpu_hotplug.lock finds the refcount * non zero and goes to sleep again. * * However, this is very difficult to achieve in practice since |
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* get_online_cpus() not an api which is called all that often. |
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* */ |
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void cpu_hotplug_begin(void) |
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{ |
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DEFINE_WAIT(wait); |
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|
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cpu_hotplug.active_writer = current; |
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cpuhp_lock_acquire(); |
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for (;;) { mutex_lock(&cpu_hotplug.lock); |
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prepare_to_wait(&cpu_hotplug.wq, &wait, TASK_UNINTERRUPTIBLE); if (likely(!atomic_read(&cpu_hotplug.refcount))) break; |
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mutex_unlock(&cpu_hotplug.lock); schedule(); |
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} |
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finish_wait(&cpu_hotplug.wq, &wait); |
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} |
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void cpu_hotplug_done(void) |
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{ cpu_hotplug.active_writer = NULL; mutex_unlock(&cpu_hotplug.lock); |
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cpuhp_lock_release(); |
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} |
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/* * Wait for currently running CPU hotplug operations to complete (if any) and * disable future CPU hotplug (from sysfs). The 'cpu_add_remove_lock' protects * the 'cpu_hotplug_disabled' flag. The same lock is also acquired by the * hotplug path before performing hotplug operations. So acquiring that lock * guarantees mutual exclusion from any currently running hotplug operations. */ void cpu_hotplug_disable(void) { cpu_maps_update_begin(); |
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cpu_hotplug_disabled++; |
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cpu_maps_update_done(); } |
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EXPORT_SYMBOL_GPL(cpu_hotplug_disable); |
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static void __cpu_hotplug_enable(void) { if (WARN_ONCE(!cpu_hotplug_disabled, "Unbalanced cpu hotplug enable ")) return; cpu_hotplug_disabled--; } |
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void cpu_hotplug_enable(void) { cpu_maps_update_begin(); |
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__cpu_hotplug_enable(); |
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cpu_maps_update_done(); } |
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EXPORT_SYMBOL_GPL(cpu_hotplug_enable); |
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#endif /* CONFIG_HOTPLUG_CPU */ |
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/* Need to know about CPUs going up/down? */ |
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int register_cpu_notifier(struct notifier_block *nb) |
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{ |
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int ret; |
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cpu_maps_update_begin(); |
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ret = raw_notifier_chain_register(&cpu_chain, nb); |
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cpu_maps_update_done(); |
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return ret; |
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} |
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int __register_cpu_notifier(struct notifier_block *nb) |
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{ return raw_notifier_chain_register(&cpu_chain, nb); } |
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static int __cpu_notify(unsigned long val, unsigned int cpu, int nr_to_call, |
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int *nr_calls) { |
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unsigned long mod = cpuhp_tasks_frozen ? CPU_TASKS_FROZEN : 0; void *hcpu = (void *)(long)cpu; |
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int ret; |
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ret = __raw_notifier_call_chain(&cpu_chain, val | mod, hcpu, nr_to_call, |
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nr_calls); |
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return notifier_to_errno(ret); |
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} |
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static int cpu_notify(unsigned long val, unsigned int cpu) |
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{ |
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return __cpu_notify(val, cpu, -1, NULL); |
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} |
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static void cpu_notify_nofail(unsigned long val, unsigned int cpu) { BUG_ON(cpu_notify(val, cpu)); } |
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/* Notifier wrappers for transitioning to state machine */ static int notify_prepare(unsigned int cpu) { int nr_calls = 0; int ret; ret = __cpu_notify(CPU_UP_PREPARE, cpu, -1, &nr_calls); if (ret) { nr_calls--; printk(KERN_WARNING "%s: attempt to bring up CPU %u failed ", __func__, cpu); __cpu_notify(CPU_UP_CANCELED, cpu, nr_calls, NULL); } return ret; } static int notify_online(unsigned int cpu) { cpu_notify(CPU_ONLINE, cpu); return 0; } |
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static int bringup_wait_for_ap(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); wait_for_completion(&st->done); return st->result; } |
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static int bringup_cpu(unsigned int cpu) { struct task_struct *idle = idle_thread_get(cpu); int ret; |
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/* * Some architectures have to walk the irq descriptors to * setup the vector space for the cpu which comes online. * Prevent irq alloc/free across the bringup. */ irq_lock_sparse(); |
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/* Arch-specific enabling code. */ ret = __cpu_up(cpu, idle); |
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irq_unlock_sparse(); |
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if (ret) { cpu_notify(CPU_UP_CANCELED, cpu); return ret; } |
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ret = bringup_wait_for_ap(cpu); |
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BUG_ON(!cpu_online(cpu)); |
8df3e07e7 cpu/hotplug: Let ... |
424 |
return ret; |
ba9974624 cpu/hotplug: Rest... |
425 |
} |
2e1a3483c cpu/hotplug: Spli... |
426 427 428 |
/* * Hotplug state machine related functions */ |
a724632ca cpu/hotplug: Rewo... |
429 |
static void undo_cpu_down(unsigned int cpu, struct cpuhp_cpu_state *st) |
2e1a3483c cpu/hotplug: Spli... |
430 431 |
{ for (st->state++; st->state < st->target; st->state++) { |
a724632ca cpu/hotplug: Rewo... |
432 |
struct cpuhp_step *step = cpuhp_get_step(st->state); |
2e1a3483c cpu/hotplug: Spli... |
433 434 |
if (!step->skip_onerr) |
cf392d10b cpu/hotplug: Add ... |
435 |
cpuhp_invoke_callback(cpu, st->state, true, NULL); |
2e1a3483c cpu/hotplug: Spli... |
436 437 438 439 |
} } static int cpuhp_down_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st, |
a724632ca cpu/hotplug: Rewo... |
440 |
enum cpuhp_state target) |
2e1a3483c cpu/hotplug: Spli... |
441 442 443 444 445 |
{ enum cpuhp_state prev_state = st->state; int ret = 0; for (; st->state > target; st->state--) { |
cf392d10b cpu/hotplug: Add ... |
446 |
ret = cpuhp_invoke_callback(cpu, st->state, false, NULL); |
2e1a3483c cpu/hotplug: Spli... |
447 448 |
if (ret) { st->target = prev_state; |
a724632ca cpu/hotplug: Rewo... |
449 |
undo_cpu_down(cpu, st); |
2e1a3483c cpu/hotplug: Spli... |
450 451 452 453 454 |
break; } } return ret; } |
a724632ca cpu/hotplug: Rewo... |
455 |
static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st) |
2e1a3483c cpu/hotplug: Spli... |
456 457 |
{ for (st->state--; st->state > st->target; st->state--) { |
a724632ca cpu/hotplug: Rewo... |
458 |
struct cpuhp_step *step = cpuhp_get_step(st->state); |
2e1a3483c cpu/hotplug: Spli... |
459 460 |
if (!step->skip_onerr) |
cf392d10b cpu/hotplug: Add ... |
461 |
cpuhp_invoke_callback(cpu, st->state, false, NULL); |
2e1a3483c cpu/hotplug: Spli... |
462 463 464 465 |
} } static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st, |
a724632ca cpu/hotplug: Rewo... |
466 |
enum cpuhp_state target) |
2e1a3483c cpu/hotplug: Spli... |
467 468 469 470 471 |
{ enum cpuhp_state prev_state = st->state; int ret = 0; while (st->state < target) { |
2e1a3483c cpu/hotplug: Spli... |
472 |
st->state++; |
cf392d10b cpu/hotplug: Add ... |
473 |
ret = cpuhp_invoke_callback(cpu, st->state, true, NULL); |
2e1a3483c cpu/hotplug: Spli... |
474 475 |
if (ret) { st->target = prev_state; |
a724632ca cpu/hotplug: Rewo... |
476 |
undo_cpu_up(cpu, st); |
2e1a3483c cpu/hotplug: Spli... |
477 478 479 480 481 |
break; } } return ret; } |
4cb28ced2 cpu/hotplug: Crea... |
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 |
/* * The cpu hotplug threads manage the bringup and teardown of the cpus */ static void cpuhp_create(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); init_completion(&st->done); } static int cpuhp_should_run(unsigned int cpu) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); return st->should_run; } /* Execute the teardown callbacks. Used to be CPU_DOWN_PREPARE */ static int cpuhp_ap_offline(unsigned int cpu, struct cpuhp_cpu_state *st) { |
1cf4f629d cpu/hotplug: Move... |
502 |
enum cpuhp_state target = max((int)st->target, CPUHP_TEARDOWN_CPU); |
4cb28ced2 cpu/hotplug: Crea... |
503 |
|
a724632ca cpu/hotplug: Rewo... |
504 |
return cpuhp_down_callbacks(cpu, st, target); |
4cb28ced2 cpu/hotplug: Crea... |
505 506 507 508 509 |
} /* Execute the online startup callbacks. Used to be CPU_ONLINE */ static int cpuhp_ap_online(unsigned int cpu, struct cpuhp_cpu_state *st) { |
a724632ca cpu/hotplug: Rewo... |
510 |
return cpuhp_up_callbacks(cpu, st, st->target); |
4cb28ced2 cpu/hotplug: Crea... |
511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 |
} /* * Execute teardown/startup callbacks on the plugged cpu. Also used to invoke * callbacks when a state gets [un]installed at runtime. */ static void cpuhp_thread_fun(unsigned int cpu) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); int ret = 0; /* * Paired with the mb() in cpuhp_kick_ap_work and * cpuhp_invoke_ap_callback, so the work set is consistent visible. */ smp_mb(); if (!st->should_run) return; st->should_run = false; /* Single callback invocation for [un]install ? */ |
a724632ca cpu/hotplug: Rewo... |
533 |
if (st->single) { |
4cb28ced2 cpu/hotplug: Crea... |
534 535 |
if (st->cb_state < CPUHP_AP_ONLINE) { local_irq_disable(); |
a724632ca cpu/hotplug: Rewo... |
536 |
ret = cpuhp_invoke_callback(cpu, st->cb_state, |
cf392d10b cpu/hotplug: Add ... |
537 |
st->bringup, st->node); |
4cb28ced2 cpu/hotplug: Crea... |
538 539 |
local_irq_enable(); } else { |
a724632ca cpu/hotplug: Rewo... |
540 |
ret = cpuhp_invoke_callback(cpu, st->cb_state, |
cf392d10b cpu/hotplug: Add ... |
541 |
st->bringup, st->node); |
4cb28ced2 cpu/hotplug: Crea... |
542 |
} |
3b9d6da67 cpu/hotplug: Fix ... |
543 544 |
} else if (st->rollback) { BUG_ON(st->state < CPUHP_AP_ONLINE_IDLE); |
a724632ca cpu/hotplug: Rewo... |
545 |
undo_cpu_down(cpu, st); |
3b9d6da67 cpu/hotplug: Fix ... |
546 547 548 549 550 551 |
/* * This is a momentary workaround to keep the notifier users * happy. Will go away once we got rid of the notifiers. */ cpu_notify_nofail(CPU_DOWN_FAILED, cpu); st->rollback = false; |
4cb28ced2 cpu/hotplug: Crea... |
552 |
} else { |
1cf4f629d cpu/hotplug: Move... |
553 |
/* Cannot happen .... */ |
8df3e07e7 cpu/hotplug: Let ... |
554 |
BUG_ON(st->state < CPUHP_AP_ONLINE_IDLE); |
1cf4f629d cpu/hotplug: Move... |
555 |
|
4cb28ced2 cpu/hotplug: Crea... |
556 557 558 559 560 561 562 563 564 565 566 |
/* Regular hotplug work */ if (st->state < st->target) ret = cpuhp_ap_online(cpu, st); else if (st->state > st->target) ret = cpuhp_ap_offline(cpu, st); } st->result = ret; complete(&st->done); } /* Invoke a single callback on a remote cpu */ |
a724632ca cpu/hotplug: Rewo... |
567 |
static int |
cf392d10b cpu/hotplug: Add ... |
568 569 |
cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state, bool bringup, struct hlist_node *node) |
4cb28ced2 cpu/hotplug: Crea... |
570 571 572 573 574 |
{ struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); if (!cpu_online(cpu)) return 0; |
6a4e24518 cpu/hotplug: Hand... |
575 576 577 578 579 |
/* * If we are up and running, use the hotplug thread. For early calls * we invoke the thread function directly. */ if (!st->thread) |
cf392d10b cpu/hotplug: Add ... |
580 |
return cpuhp_invoke_callback(cpu, state, bringup, node); |
6a4e24518 cpu/hotplug: Hand... |
581 |
|
4cb28ced2 cpu/hotplug: Crea... |
582 |
st->cb_state = state; |
a724632ca cpu/hotplug: Rewo... |
583 584 |
st->single = true; st->bringup = bringup; |
cf392d10b cpu/hotplug: Add ... |
585 |
st->node = node; |
a724632ca cpu/hotplug: Rewo... |
586 |
|
4cb28ced2 cpu/hotplug: Crea... |
587 588 589 590 591 592 593 594 595 596 597 598 |
/* * Make sure the above stores are visible before should_run becomes * true. Paired with the mb() above in cpuhp_thread_fun() */ smp_mb(); st->should_run = true; wake_up_process(st->thread); wait_for_completion(&st->done); return st->result; } /* Regular hotplug invocation of the AP hotplug thread */ |
1cf4f629d cpu/hotplug: Move... |
599 |
static void __cpuhp_kick_ap_work(struct cpuhp_cpu_state *st) |
4cb28ced2 cpu/hotplug: Crea... |
600 |
{ |
4cb28ced2 cpu/hotplug: Crea... |
601 |
st->result = 0; |
a724632ca cpu/hotplug: Rewo... |
602 |
st->single = false; |
4cb28ced2 cpu/hotplug: Crea... |
603 604 605 606 607 608 609 |
/* * Make sure the above stores are visible before should_run becomes * true. Paired with the mb() above in cpuhp_thread_fun() */ smp_mb(); st->should_run = true; wake_up_process(st->thread); |
1cf4f629d cpu/hotplug: Move... |
610 611 612 613 614 615 616 617 618 |
} static int cpuhp_kick_ap_work(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); enum cpuhp_state state = st->state; trace_cpuhp_enter(cpu, st->target, state, cpuhp_kick_ap_work); __cpuhp_kick_ap_work(st); |
4cb28ced2 cpu/hotplug: Crea... |
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 |
wait_for_completion(&st->done); trace_cpuhp_exit(cpu, st->state, state, st->result); return st->result; } static struct smp_hotplug_thread cpuhp_threads = { .store = &cpuhp_state.thread, .create = &cpuhp_create, .thread_should_run = cpuhp_should_run, .thread_fn = cpuhp_thread_fun, .thread_comm = "cpuhp/%u", .selfparking = true, }; void __init cpuhp_threads_init(void) { BUG_ON(smpboot_register_percpu_thread(&cpuhp_threads)); kthread_unpark(this_cpu_read(cpuhp_state.thread)); } |
1da177e4c Linux-2.6.12-rc2 |
638 |
EXPORT_SYMBOL(register_cpu_notifier); |
93ae4f978 CPU hotplug: Prov... |
639 |
EXPORT_SYMBOL(__register_cpu_notifier); |
71cf5aeeb kernel, cpu: Remo... |
640 |
void unregister_cpu_notifier(struct notifier_block *nb) |
1da177e4c Linux-2.6.12-rc2 |
641 |
{ |
d221938c0 cpu-hotplug: refc... |
642 |
cpu_maps_update_begin(); |
bd5349cfd [PATCH] Convert c... |
643 |
raw_notifier_chain_unregister(&cpu_chain, nb); |
d221938c0 cpu-hotplug: refc... |
644 |
cpu_maps_update_done(); |
1da177e4c Linux-2.6.12-rc2 |
645 646 |
} EXPORT_SYMBOL(unregister_cpu_notifier); |
71cf5aeeb kernel, cpu: Remo... |
647 |
void __unregister_cpu_notifier(struct notifier_block *nb) |
93ae4f978 CPU hotplug: Prov... |
648 649 650 651 |
{ raw_notifier_chain_unregister(&cpu_chain, nb); } EXPORT_SYMBOL(__unregister_cpu_notifier); |
56eaecc8e hotplug: Make reg... |
652 |
#ifdef CONFIG_HOTPLUG_CPU |
e4cc2f873 kernel/cpu.c: doc... |
653 654 655 656 657 658 659 660 661 662 663 664 |
/** * clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU * @cpu: a CPU id * * This function walks all processes, finds a valid mm struct for each one and * then clears a corresponding bit in mm's cpumask. While this all sounds * trivial, there are various non-obvious corner cases, which this function * tries to solve in a safe manner. * * Also note that the function uses a somewhat relaxed locking scheme, so it may * be called only for an already offlined CPU. */ |
cb79295e2 cpu: introduce cl... |
665 666 667 668 669 670 671 672 673 674 675 |
void clear_tasks_mm_cpumask(int cpu) { struct task_struct *p; /* * This function is called after the cpu is taken down and marked * offline, so its not like new tasks will ever get this cpu set in * their mm mask. -- Peter Zijlstra * Thus, we may use rcu_read_lock() here, instead of grabbing * full-fledged tasklist_lock. */ |
e4cc2f873 kernel/cpu.c: doc... |
676 |
WARN_ON(cpu_online(cpu)); |
cb79295e2 cpu: introduce cl... |
677 678 679 |
rcu_read_lock(); for_each_process(p) { struct task_struct *t; |
e4cc2f873 kernel/cpu.c: doc... |
680 681 682 683 |
/* * Main thread might exit, but other threads may still have * a valid mm. Find one. */ |
cb79295e2 cpu: introduce cl... |
684 685 686 687 688 689 690 691 |
t = find_lock_task_mm(p); if (!t) continue; cpumask_clear_cpu(cpu, mm_cpumask(t->mm)); task_unlock(t); } rcu_read_unlock(); } |
b728ca060 sched: Rework che... |
692 |
static inline void check_for_tasks(int dead_cpu) |
1da177e4c Linux-2.6.12-rc2 |
693 |
{ |
b728ca060 sched: Rework che... |
694 |
struct task_struct *g, *p; |
1da177e4c Linux-2.6.12-rc2 |
695 |
|
a75a6068d cpu/hotplug: Read... |
696 697 |
read_lock(&tasklist_lock); for_each_process_thread(g, p) { |
b728ca060 sched: Rework che... |
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 |
if (!p->on_rq) continue; /* * We do the check with unlocked task_rq(p)->lock. * Order the reading to do not warn about a task, * which was running on this cpu in the past, and * it's just been woken on another cpu. */ rmb(); if (task_cpu(p) != dead_cpu) continue; pr_warn("Task %s (pid=%d) is on cpu %d (state=%ld, flags=%x) ", p->comm, task_pid_nr(p), dead_cpu, p->state, p->flags); |
a75a6068d cpu/hotplug: Read... |
713 714 |
} read_unlock(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
715 |
} |
984581728 cpu/hotplug: Spli... |
716 717 718 719 720 721 722 723 724 725 726 727 728 729 |
static int notify_down_prepare(unsigned int cpu) { int err, nr_calls = 0; err = __cpu_notify(CPU_DOWN_PREPARE, cpu, -1, &nr_calls); if (err) { nr_calls--; __cpu_notify(CPU_DOWN_FAILED, cpu, nr_calls, NULL); pr_warn("%s: attempt to take down CPU %u failed ", __func__, cpu); } return err; } |
1da177e4c Linux-2.6.12-rc2 |
730 |
/* Take this CPU down. */ |
71cf5aeeb kernel, cpu: Remo... |
731 |
static int take_cpu_down(void *_param) |
1da177e4c Linux-2.6.12-rc2 |
732 |
{ |
4baa0afc6 cpu/hotplug: Conv... |
733 734 |
struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); enum cpuhp_state target = max((int)st->target, CPUHP_AP_OFFLINE); |
090e77c39 cpu/hotplug: Rest... |
735 |
int err, cpu = smp_processor_id(); |
1da177e4c Linux-2.6.12-rc2 |
736 |
|
1da177e4c Linux-2.6.12-rc2 |
737 738 739 |
/* Ensure this CPU doesn't handle any more interrupts. */ err = __cpu_disable(); if (err < 0) |
f37051364 [PATCH] i386 CPU ... |
740 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
741 |
|
a724632ca cpu/hotplug: Rewo... |
742 743 744 745 746 747 |
/* * We get here while we are in CPUHP_TEARDOWN_CPU state and we must not * do this step again. */ WARN_ON(st->state != CPUHP_TEARDOWN_CPU); st->state--; |
4baa0afc6 cpu/hotplug: Conv... |
748 |
/* Invoke the former CPU_DYING callbacks */ |
a724632ca cpu/hotplug: Rewo... |
749 |
for (; st->state > target; st->state--) |
cf392d10b cpu/hotplug: Add ... |
750 |
cpuhp_invoke_callback(cpu, st->state, false, NULL); |
4baa0afc6 cpu/hotplug: Conv... |
751 |
|
52c063d1a clockevents: Make... |
752 753 |
/* Give up timekeeping duties */ tick_handover_do_timer(); |
14e568e78 stop_machine: Use... |
754 |
/* Park the stopper thread */ |
090e77c39 cpu/hotplug: Rest... |
755 |
stop_machine_park(cpu); |
f37051364 [PATCH] i386 CPU ... |
756 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
757 |
} |
984581728 cpu/hotplug: Spli... |
758 |
static int takedown_cpu(unsigned int cpu) |
1da177e4c Linux-2.6.12-rc2 |
759 |
{ |
e69aab131 cpu/hotplug: Make... |
760 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
984581728 cpu/hotplug: Spli... |
761 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
762 |
|
2a58c527b cpu/hotplug: Fix ... |
763 |
/* Park the smpboot threads */ |
1cf4f629d cpu/hotplug: Move... |
764 |
kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread); |
2a58c527b cpu/hotplug: Fix ... |
765 |
smpboot_park_threads(cpu); |
1cf4f629d cpu/hotplug: Move... |
766 |
|
6acce3ef8 sched: Remove get... |
767 |
/* |
a89941816 hotplug: Prevent ... |
768 769 |
* Prevent irq alloc/free while the dying cpu reorganizes the * interrupt affinities. |
6acce3ef8 sched: Remove get... |
770 |
*/ |
a89941816 hotplug: Prevent ... |
771 |
irq_lock_sparse(); |
6acce3ef8 sched: Remove get... |
772 |
|
a89941816 hotplug: Prevent ... |
773 774 775 |
/* * So now all preempt/rcu users must observe !cpu_active(). */ |
090e77c39 cpu/hotplug: Rest... |
776 |
err = stop_machine(take_cpu_down, NULL, cpumask_of(cpu)); |
043215875 Hotplug CPU: don'... |
777 |
if (err) { |
3b9d6da67 cpu/hotplug: Fix ... |
778 |
/* CPU refused to die */ |
a89941816 hotplug: Prevent ... |
779 |
irq_unlock_sparse(); |
3b9d6da67 cpu/hotplug: Fix ... |
780 781 |
/* Unpark the hotplug thread so we can rollback there */ kthread_unpark(per_cpu_ptr(&cpuhp_state, cpu)->thread); |
984581728 cpu/hotplug: Spli... |
782 |
return err; |
8fa1d7d3b [PATCH] cpu-hotpl... |
783 |
} |
043215875 Hotplug CPU: don'... |
784 |
BUG_ON(cpu_online(cpu)); |
1da177e4c Linux-2.6.12-rc2 |
785 |
|
48c5ccae8 sched: Simplify c... |
786 |
/* |
ee1e714b9 cpu/hotplug: Remo... |
787 |
* The CPUHP_AP_SCHED_MIGRATE_DYING callback will have removed all |
48c5ccae8 sched: Simplify c... |
788 789 |
* runnable tasks from the cpu, there's only the idle task left now * that the migration thread is done doing the stop_machine thing. |
51a96c778 cpu: Remove incor... |
790 791 |
* * Wait for the stop thread to go away. |
48c5ccae8 sched: Simplify c... |
792 |
*/ |
e69aab131 cpu/hotplug: Make... |
793 794 |
wait_for_completion(&st->done); BUG_ON(st->state != CPUHP_AP_IDLE_DEAD); |
1da177e4c Linux-2.6.12-rc2 |
795 |
|
a89941816 hotplug: Prevent ... |
796 797 |
/* Interrupts are moved away from the dying cpu, reenable alloc/free */ irq_unlock_sparse(); |
345527b1e clockevents: Fix ... |
798 |
hotplug_cpu__broadcast_tick_pull(cpu); |
1da177e4c Linux-2.6.12-rc2 |
799 800 |
/* This actually kills the CPU. */ __cpu_die(cpu); |
a49b116dc clockevents: Clea... |
801 |
tick_cleanup_dead_cpu(cpu); |
984581728 cpu/hotplug: Spli... |
802 803 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
804 |
|
984581728 cpu/hotplug: Spli... |
805 806 807 |
static int notify_dead(unsigned int cpu) { cpu_notify_nofail(CPU_DEAD, cpu); |
1da177e4c Linux-2.6.12-rc2 |
808 |
check_for_tasks(cpu); |
984581728 cpu/hotplug: Spli... |
809 810 |
return 0; } |
71f87b2fc cpu/hotplug: Plug... |
811 812 813 814 815 816 |
static void cpuhp_complete_idle_dead(void *arg) { struct cpuhp_cpu_state *st = arg; complete(&st->done); } |
e69aab131 cpu/hotplug: Make... |
817 818 819 820 821 |
void cpuhp_report_idle_dead(void) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); BUG_ON(st->state != CPUHP_AP_OFFLINE); |
27d50c7ee rcu: Make CPU_DYI... |
822 |
rcu_report_dead(smp_processor_id()); |
71f87b2fc cpu/hotplug: Plug... |
823 824 825 826 827 828 829 |
st->state = CPUHP_AP_IDLE_DEAD; /* * We cannot call complete after rcu_report_dead() so we delegate it * to an online cpu. */ smp_call_function_single(cpumask_first(cpu_online_mask), cpuhp_complete_idle_dead, st, 0); |
e69aab131 cpu/hotplug: Make... |
830 |
} |
cff7d378d cpu/hotplug: Conv... |
831 832 833 834 835 836 837 |
#else #define notify_down_prepare NULL #define takedown_cpu NULL #define notify_dead NULL #endif #ifdef CONFIG_HOTPLUG_CPU |
cff7d378d cpu/hotplug: Conv... |
838 |
|
984581728 cpu/hotplug: Spli... |
839 |
/* Requires cpu_add_remove_lock to be held */ |
af1f40457 cpu/hotplug: Hand... |
840 841 |
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, enum cpuhp_state target) |
984581728 cpu/hotplug: Spli... |
842 |
{ |
cff7d378d cpu/hotplug: Conv... |
843 844 845 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int prev_state, ret = 0; bool hasdied = false; |
984581728 cpu/hotplug: Spli... |
846 847 848 |
if (num_online_cpus() == 1) return -EBUSY; |
757c989b9 cpu/hotplug: Make... |
849 |
if (!cpu_present(cpu)) |
984581728 cpu/hotplug: Spli... |
850 851 852 853 854 |
return -EINVAL; cpu_hotplug_begin(); cpuhp_tasks_frozen = tasks_frozen; |
cff7d378d cpu/hotplug: Conv... |
855 |
prev_state = st->state; |
af1f40457 cpu/hotplug: Hand... |
856 |
st->target = target; |
1cf4f629d cpu/hotplug: Move... |
857 858 859 860 |
/* * If the current CPU state is in the range of the AP hotplug thread, * then we need to kick the thread. */ |
8df3e07e7 cpu/hotplug: Let ... |
861 |
if (st->state > CPUHP_TEARDOWN_CPU) { |
1cf4f629d cpu/hotplug: Move... |
862 863 864 865 866 867 868 869 870 871 872 873 |
ret = cpuhp_kick_ap_work(cpu); /* * The AP side has done the error rollback already. Just * return the error code.. */ if (ret) goto out; /* * We might have stopped still in the range of the AP hotplug * thread. Nothing to do anymore. */ |
8df3e07e7 cpu/hotplug: Let ... |
874 |
if (st->state > CPUHP_TEARDOWN_CPU) |
1cf4f629d cpu/hotplug: Move... |
875 876 877 |
goto out; } /* |
8df3e07e7 cpu/hotplug: Let ... |
878 |
* The AP brought itself down to CPUHP_TEARDOWN_CPU. So we need |
1cf4f629d cpu/hotplug: Move... |
879 880 |
* to do the further cleanups. */ |
a724632ca cpu/hotplug: Rewo... |
881 |
ret = cpuhp_down_callbacks(cpu, st, target); |
3b9d6da67 cpu/hotplug: Fix ... |
882 883 884 885 886 |
if (ret && st->state > CPUHP_TEARDOWN_CPU && st->state < prev_state) { st->target = prev_state; st->rollback = true; cpuhp_kick_ap_work(cpu); } |
984581728 cpu/hotplug: Spli... |
887 |
|
cff7d378d cpu/hotplug: Conv... |
888 |
hasdied = prev_state != st->state && st->state == CPUHP_OFFLINE; |
1cf4f629d cpu/hotplug: Move... |
889 |
out: |
d221938c0 cpu-hotplug: refc... |
890 |
cpu_hotplug_done(); |
cff7d378d cpu/hotplug: Conv... |
891 892 |
/* This post dead nonsense must die */ if (!ret && hasdied) |
090e77c39 cpu/hotplug: Rest... |
893 |
cpu_notify_nofail(CPU_POST_DEAD, cpu); |
cff7d378d cpu/hotplug: Conv... |
894 |
return ret; |
e3920fb42 [PATCH] Disable C... |
895 |
} |
af1f40457 cpu/hotplug: Hand... |
896 |
static int do_cpu_down(unsigned int cpu, enum cpuhp_state target) |
e3920fb42 [PATCH] Disable C... |
897 |
{ |
9ea09af3b stop_machine: int... |
898 |
int err; |
e3920fb42 [PATCH] Disable C... |
899 |
|
d221938c0 cpu-hotplug: refc... |
900 |
cpu_maps_update_begin(); |
e761b7725 cpu hotplug, sche... |
901 902 |
if (cpu_hotplug_disabled) { |
e3920fb42 [PATCH] Disable C... |
903 |
err = -EBUSY; |
e761b7725 cpu hotplug, sche... |
904 905 |
goto out; } |
af1f40457 cpu/hotplug: Hand... |
906 |
err = _cpu_down(cpu, 0, target); |
e3920fb42 [PATCH] Disable C... |
907 |
|
e761b7725 cpu hotplug, sche... |
908 |
out: |
d221938c0 cpu-hotplug: refc... |
909 |
cpu_maps_update_done(); |
1da177e4c Linux-2.6.12-rc2 |
910 911 |
return err; } |
af1f40457 cpu/hotplug: Hand... |
912 913 914 915 |
int cpu_down(unsigned int cpu) { return do_cpu_down(cpu, CPUHP_OFFLINE); } |
b62b8ef90 force offline the... |
916 |
EXPORT_SYMBOL(cpu_down); |
1da177e4c Linux-2.6.12-rc2 |
917 |
#endif /*CONFIG_HOTPLUG_CPU*/ |
4baa0afc6 cpu/hotplug: Conv... |
918 |
/** |
ee1e714b9 cpu/hotplug: Remo... |
919 |
* notify_cpu_starting(cpu) - Invoke the callbacks on the starting CPU |
4baa0afc6 cpu/hotplug: Conv... |
920 921 |
* @cpu: cpu that just started * |
4baa0afc6 cpu/hotplug: Conv... |
922 923 924 925 926 927 928 |
* It must be called by the arch code on the new cpu, before the new cpu * enables interrupts and before the "boot" cpu returns from __cpu_up(). */ void notify_cpu_starting(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); enum cpuhp_state target = min((int)st->target, CPUHP_AP_ONLINE); |
0c6d4576c cpu/hotplug: Get ... |
929 |
rcu_cpu_starting(cpu); /* Enables RCU usage on this CPU. */ |
4baa0afc6 cpu/hotplug: Conv... |
930 |
while (st->state < target) { |
4baa0afc6 cpu/hotplug: Conv... |
931 |
st->state++; |
cf392d10b cpu/hotplug: Add ... |
932 |
cpuhp_invoke_callback(cpu, st->state, true, NULL); |
4baa0afc6 cpu/hotplug: Conv... |
933 934 |
} } |
949338e35 cpu/hotplug: Move... |
935 936 |
/* * Called from the idle task. We need to set active here, so we can kick off |
8df3e07e7 cpu/hotplug: Let ... |
937 938 939 |
* the stopper thread and unpark the smpboot threads. If the target state is * beyond CPUHP_AP_ONLINE_IDLE we kick cpuhp thread and let it bring up the * cpu further. |
949338e35 cpu/hotplug: Move... |
940 |
*/ |
8df3e07e7 cpu/hotplug: Let ... |
941 |
void cpuhp_online_idle(enum cpuhp_state state) |
949338e35 cpu/hotplug: Move... |
942 |
{ |
8df3e07e7 cpu/hotplug: Let ... |
943 944 945 946 947 948 949 950 |
struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); unsigned int cpu = smp_processor_id(); /* Happens for the boot cpu */ if (state != CPUHP_AP_ONLINE_IDLE) return; st->state = CPUHP_AP_ONLINE_IDLE; |
1cf4f629d cpu/hotplug: Move... |
951 |
|
8df3e07e7 cpu/hotplug: Let ... |
952 |
/* Unpark the stopper thread and the hotplug thread of this cpu */ |
949338e35 cpu/hotplug: Move... |
953 |
stop_machine_unpark(cpu); |
1cf4f629d cpu/hotplug: Move... |
954 |
kthread_unpark(st->thread); |
8df3e07e7 cpu/hotplug: Let ... |
955 956 957 958 959 960 |
/* Should we go further up ? */ if (st->target > CPUHP_AP_ONLINE_IDLE) __cpuhp_kick_ap_work(st); else complete(&st->done); |
949338e35 cpu/hotplug: Move... |
961 |
} |
e3920fb42 [PATCH] Disable C... |
962 |
/* Requires cpu_add_remove_lock to be held */ |
af1f40457 cpu/hotplug: Hand... |
963 |
static int _cpu_up(unsigned int cpu, int tasks_frozen, enum cpuhp_state target) |
1da177e4c Linux-2.6.12-rc2 |
964 |
{ |
cff7d378d cpu/hotplug: Conv... |
965 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
3bb5d2ee3 smp, idle: Alloca... |
966 |
struct task_struct *idle; |
2e1a3483c cpu/hotplug: Spli... |
967 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
968 |
|
d221938c0 cpu-hotplug: refc... |
969 |
cpu_hotplug_begin(); |
38498a67a smp: Add generic ... |
970 |
|
757c989b9 cpu/hotplug: Make... |
971 |
if (!cpu_present(cpu)) { |
5e5041f35 ACPI / processor:... |
972 973 974 |
ret = -EINVAL; goto out; } |
757c989b9 cpu/hotplug: Make... |
975 976 977 978 979 |
/* * The caller of do_cpu_up might have raced with another * caller. Ignore it for now. */ if (st->state >= target) |
38498a67a smp: Add generic ... |
980 |
goto out; |
757c989b9 cpu/hotplug: Make... |
981 982 983 984 985 986 987 988 |
if (st->state == CPUHP_OFFLINE) { /* Let it fail before we try to bring the cpu up */ idle = idle_thread_get(cpu); if (IS_ERR(idle)) { ret = PTR_ERR(idle); goto out; } |
3bb5d2ee3 smp, idle: Alloca... |
989 |
} |
38498a67a smp: Add generic ... |
990 |
|
ba9974624 cpu/hotplug: Rest... |
991 |
cpuhp_tasks_frozen = tasks_frozen; |
af1f40457 cpu/hotplug: Hand... |
992 |
st->target = target; |
1cf4f629d cpu/hotplug: Move... |
993 994 995 996 |
/* * If the current CPU state is in the range of the AP hotplug thread, * then we need to kick the thread once more. */ |
8df3e07e7 cpu/hotplug: Let ... |
997 |
if (st->state > CPUHP_BRINGUP_CPU) { |
1cf4f629d cpu/hotplug: Move... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
ret = cpuhp_kick_ap_work(cpu); /* * The AP side has done the error rollback already. Just * return the error code.. */ if (ret) goto out; } /* * Try to reach the target state. We max out on the BP at |
8df3e07e7 cpu/hotplug: Let ... |
1009 |
* CPUHP_BRINGUP_CPU. After that the AP hotplug thread is |
1cf4f629d cpu/hotplug: Move... |
1010 1011 |
* responsible for bringing it up to the target state. */ |
8df3e07e7 cpu/hotplug: Let ... |
1012 |
target = min((int)target, CPUHP_BRINGUP_CPU); |
a724632ca cpu/hotplug: Rewo... |
1013 |
ret = cpuhp_up_callbacks(cpu, st, target); |
38498a67a smp: Add generic ... |
1014 |
out: |
d221938c0 cpu-hotplug: refc... |
1015 |
cpu_hotplug_done(); |
e3920fb42 [PATCH] Disable C... |
1016 1017 |
return ret; } |
af1f40457 cpu/hotplug: Hand... |
1018 |
static int do_cpu_up(unsigned int cpu, enum cpuhp_state target) |
e3920fb42 [PATCH] Disable C... |
1019 1020 |
{ int err = 0; |
cf23422b9 cpu/mem hotplug: ... |
1021 |
|
e0b582ec5 cpumask: convert ... |
1022 |
if (!cpu_possible(cpu)) { |
84117da5b kernel/cpu.c: con... |
1023 1024 1025 |
pr_err("can't online cpu %d because it is not configured as may-hotadd at boot time ", cpu); |
87d5e0236 kernel/cpu.c: del... |
1026 |
#if defined(CONFIG_IA64) |
84117da5b kernel/cpu.c: con... |
1027 1028 |
pr_err("please check additional_cpus= boot parameter "); |
73e753a50 CPU HOTPLUG: avoi... |
1029 1030 1031 |
#endif return -EINVAL; } |
e3920fb42 [PATCH] Disable C... |
1032 |
|
01b0f1970 cpu/mem hotplug: ... |
1033 1034 1035 |
err = try_online_node(cpu_to_node(cpu)); if (err) return err; |
cf23422b9 cpu/mem hotplug: ... |
1036 |
|
d221938c0 cpu-hotplug: refc... |
1037 |
cpu_maps_update_begin(); |
e761b7725 cpu hotplug, sche... |
1038 1039 |
if (cpu_hotplug_disabled) { |
e3920fb42 [PATCH] Disable C... |
1040 |
err = -EBUSY; |
e761b7725 cpu hotplug, sche... |
1041 1042 |
goto out; } |
af1f40457 cpu/hotplug: Hand... |
1043 |
err = _cpu_up(cpu, 0, target); |
e761b7725 cpu hotplug, sche... |
1044 |
out: |
d221938c0 cpu-hotplug: refc... |
1045 |
cpu_maps_update_done(); |
e3920fb42 [PATCH] Disable C... |
1046 1047 |
return err; } |
af1f40457 cpu/hotplug: Hand... |
1048 1049 1050 1051 1052 |
int cpu_up(unsigned int cpu) { return do_cpu_up(cpu, CPUHP_ONLINE); } |
a513f6bab cpu: Export cpu_up() |
1053 |
EXPORT_SYMBOL_GPL(cpu_up); |
e3920fb42 [PATCH] Disable C... |
1054 |
|
f3de4be9d PM: Fix dependenc... |
1055 |
#ifdef CONFIG_PM_SLEEP_SMP |
e0b582ec5 cpumask: convert ... |
1056 |
static cpumask_var_t frozen_cpus; |
e3920fb42 [PATCH] Disable C... |
1057 |
|
d391e5522 cpu/hotplug: Allo... |
1058 |
int freeze_secondary_cpus(int primary) |
e3920fb42 [PATCH] Disable C... |
1059 |
{ |
d391e5522 cpu/hotplug: Allo... |
1060 |
int cpu, error = 0; |
e3920fb42 [PATCH] Disable C... |
1061 |
|
d221938c0 cpu-hotplug: refc... |
1062 |
cpu_maps_update_begin(); |
d391e5522 cpu/hotplug: Allo... |
1063 1064 |
if (!cpu_online(primary)) primary = cpumask_first(cpu_online_mask); |
9ee349ad6 sched: Fix set_cp... |
1065 1066 |
/* * We take down all of the non-boot CPUs in one shot to avoid races |
e3920fb42 [PATCH] Disable C... |
1067 1068 |
* with the userspace trying to use the CPU hotplug at the same time */ |
e0b582ec5 cpumask: convert ... |
1069 |
cpumask_clear(frozen_cpus); |
6ad4c1888 sched: Fix balanc... |
1070 |
|
84117da5b kernel/cpu.c: con... |
1071 1072 |
pr_info("Disabling non-boot CPUs ... "); |
e3920fb42 [PATCH] Disable C... |
1073 |
for_each_online_cpu(cpu) { |
d391e5522 cpu/hotplug: Allo... |
1074 |
if (cpu == primary) |
e3920fb42 [PATCH] Disable C... |
1075 |
continue; |
bb3632c61 PM / sleep: trace... |
1076 |
trace_suspend_resume(TPS("CPU_OFF"), cpu, true); |
af1f40457 cpu/hotplug: Hand... |
1077 |
error = _cpu_down(cpu, 1, CPUHP_OFFLINE); |
bb3632c61 PM / sleep: trace... |
1078 |
trace_suspend_resume(TPS("CPU_OFF"), cpu, false); |
feae3203d timers, init: Lim... |
1079 |
if (!error) |
e0b582ec5 cpumask: convert ... |
1080 |
cpumask_set_cpu(cpu, frozen_cpus); |
feae3203d timers, init: Lim... |
1081 |
else { |
84117da5b kernel/cpu.c: con... |
1082 1083 |
pr_err("Error taking CPU%d down: %d ", cpu, error); |
e3920fb42 [PATCH] Disable C... |
1084 1085 1086 |
break; } } |
86886e55b x86, intel_txt: I... |
1087 |
|
89af7ba57 cpu-hotplug: conv... |
1088 |
if (!error) |
e3920fb42 [PATCH] Disable C... |
1089 |
BUG_ON(num_online_cpus() > 1); |
89af7ba57 cpu-hotplug: conv... |
1090 |
else |
84117da5b kernel/cpu.c: con... |
1091 1092 |
pr_err("Non-boot CPUs are not disabled "); |
89af7ba57 cpu-hotplug: conv... |
1093 1094 1095 1096 1097 1098 1099 |
/* * Make sure the CPUs won't be enabled by someone else. We need to do * this even in case of failure as all disable_nonboot_cpus() users are * supposed to do enable_nonboot_cpus() on the failure path. */ cpu_hotplug_disabled++; |
d221938c0 cpu-hotplug: refc... |
1100 |
cpu_maps_update_done(); |
e3920fb42 [PATCH] Disable C... |
1101 1102 |
return error; } |
d0af9eed5 x86, pat/mtrr: Re... |
1103 1104 1105 1106 1107 1108 1109 |
void __weak arch_enable_nonboot_cpus_begin(void) { } void __weak arch_enable_nonboot_cpus_end(void) { } |
71cf5aeeb kernel, cpu: Remo... |
1110 |
void enable_nonboot_cpus(void) |
e3920fb42 [PATCH] Disable C... |
1111 1112 1113 1114 |
{ int cpu, error; /* Allow everyone to use the CPU hotplug again */ |
d221938c0 cpu-hotplug: refc... |
1115 |
cpu_maps_update_begin(); |
01b411590 cpu/hotplug: Hand... |
1116 |
__cpu_hotplug_enable(); |
e0b582ec5 cpumask: convert ... |
1117 |
if (cpumask_empty(frozen_cpus)) |
1d64b9cb1 [PATCH] Fix micro... |
1118 |
goto out; |
e3920fb42 [PATCH] Disable C... |
1119 |
|
84117da5b kernel/cpu.c: con... |
1120 1121 |
pr_info("Enabling non-boot CPUs ... "); |
d0af9eed5 x86, pat/mtrr: Re... |
1122 1123 |
arch_enable_nonboot_cpus_begin(); |
e0b582ec5 cpumask: convert ... |
1124 |
for_each_cpu(cpu, frozen_cpus) { |
bb3632c61 PM / sleep: trace... |
1125 |
trace_suspend_resume(TPS("CPU_ON"), cpu, true); |
af1f40457 cpu/hotplug: Hand... |
1126 |
error = _cpu_up(cpu, 1, CPUHP_ONLINE); |
bb3632c61 PM / sleep: trace... |
1127 |
trace_suspend_resume(TPS("CPU_ON"), cpu, false); |
e3920fb42 [PATCH] Disable C... |
1128 |
if (!error) { |
84117da5b kernel/cpu.c: con... |
1129 1130 |
pr_info("CPU%d is up ", cpu); |
e3920fb42 [PATCH] Disable C... |
1131 1132 |
continue; } |
84117da5b kernel/cpu.c: con... |
1133 1134 |
pr_warn("Error taking CPU%d up: %d ", cpu, error); |
e3920fb42 [PATCH] Disable C... |
1135 |
} |
d0af9eed5 x86, pat/mtrr: Re... |
1136 1137 |
arch_enable_nonboot_cpus_end(); |
e0b582ec5 cpumask: convert ... |
1138 |
cpumask_clear(frozen_cpus); |
1d64b9cb1 [PATCH] Fix micro... |
1139 |
out: |
d221938c0 cpu-hotplug: refc... |
1140 |
cpu_maps_update_done(); |
1da177e4c Linux-2.6.12-rc2 |
1141 |
} |
e0b582ec5 cpumask: convert ... |
1142 |
|
d7268a31c CPU: Add right qu... |
1143 |
static int __init alloc_frozen_cpus(void) |
e0b582ec5 cpumask: convert ... |
1144 1145 1146 1147 1148 1149 |
{ if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) return -ENOMEM; return 0; } core_initcall(alloc_frozen_cpus); |
79cfbdfa8 PM / Sleep: Fix r... |
1150 1151 |
/* |
79cfbdfa8 PM / Sleep: Fix r... |
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 |
* When callbacks for CPU hotplug notifications are being executed, we must * ensure that the state of the system with respect to the tasks being frozen * or not, as reported by the notification, remains unchanged *throughout the * duration* of the execution of the callbacks. * Hence we need to prevent the freezer from racing with regular CPU hotplug. * * This synchronization is implemented by mutually excluding regular CPU * hotplug and Suspend/Hibernate call paths by hooking onto the Suspend/ * Hibernate notifications. */ static int cpu_hotplug_pm_callback(struct notifier_block *nb, unsigned long action, void *ptr) { switch (action) { case PM_SUSPEND_PREPARE: case PM_HIBERNATION_PREPARE: |
16e53dbf1 CPU hotplug: prov... |
1170 |
cpu_hotplug_disable(); |
79cfbdfa8 PM / Sleep: Fix r... |
1171 1172 1173 1174 |
break; case PM_POST_SUSPEND: case PM_POST_HIBERNATION: |
16e53dbf1 CPU hotplug: prov... |
1175 |
cpu_hotplug_enable(); |
79cfbdfa8 PM / Sleep: Fix r... |
1176 1177 1178 1179 1180 1181 1182 1183 |
break; default: return NOTIFY_DONE; } return NOTIFY_OK; } |
d7268a31c CPU: Add right qu... |
1184 |
static int __init cpu_hotplug_pm_sync_init(void) |
79cfbdfa8 PM / Sleep: Fix r... |
1185 |
{ |
6e32d479d kernel/cpu.c: Add... |
1186 1187 1188 1189 1190 |
/* * cpu_hotplug_pm_callback has higher priority than x86 * bsp_pm_callback which depends on cpu_hotplug_pm_callback * to disable cpu hotplug to avoid cpu hotplug race. */ |
79cfbdfa8 PM / Sleep: Fix r... |
1191 1192 1193 1194 |
pm_notifier(cpu_hotplug_pm_callback, 0); return 0; } core_initcall(cpu_hotplug_pm_sync_init); |
f3de4be9d PM: Fix dependenc... |
1195 |
#endif /* CONFIG_PM_SLEEP_SMP */ |
68f4f1ec0 sched: Move cpu m... |
1196 1197 |
#endif /* CONFIG_SMP */ |
b8d317d10 cpumask: make cpu... |
1198 |
|
cff7d378d cpu/hotplug: Conv... |
1199 1200 1201 1202 |
/* Boot processor state steps */ static struct cpuhp_step cpuhp_bp_states[] = { [CPUHP_OFFLINE] = { .name = "offline", |
3c1627e99 cpu/hotplug: Repl... |
1203 1204 |
.startup.single = NULL, .teardown.single = NULL, |
cff7d378d cpu/hotplug: Conv... |
1205 1206 1207 |
}, #ifdef CONFIG_SMP [CPUHP_CREATE_THREADS]= { |
677f66465 cpu/hotplug: Make... |
1208 |
.name = "threads:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1209 1210 |
.startup.single = smpboot_create_threads, .teardown.single = NULL, |
757c989b9 cpu/hotplug: Make... |
1211 |
.cant_stop = true, |
cff7d378d cpu/hotplug: Conv... |
1212 |
}, |
00e16c3d6 perf/core: Conver... |
1213 |
[CPUHP_PERF_PREPARE] = { |
3c1627e99 cpu/hotplug: Repl... |
1214 1215 1216 |
.name = "perf:prepare", .startup.single = perf_event_init_cpu, .teardown.single = perf_event_exit_cpu, |
00e16c3d6 perf/core: Conver... |
1217 |
}, |
7ee681b25 workqueue: Conver... |
1218 |
[CPUHP_WORKQUEUE_PREP] = { |
3c1627e99 cpu/hotplug: Repl... |
1219 1220 1221 |
.name = "workqueue:prepare", .startup.single = workqueue_prepare_cpu, .teardown.single = NULL, |
7ee681b25 workqueue: Conver... |
1222 |
}, |
27590dc17 hrtimer: Convert ... |
1223 |
[CPUHP_HRTIMERS_PREPARE] = { |
3c1627e99 cpu/hotplug: Repl... |
1224 1225 1226 |
.name = "hrtimers:prepare", .startup.single = hrtimers_prepare_cpu, .teardown.single = hrtimers_dead_cpu, |
27590dc17 hrtimer: Convert ... |
1227 |
}, |
31487f832 smp/cfd: Convert ... |
1228 |
[CPUHP_SMPCFD_PREPARE] = { |
677f66465 cpu/hotplug: Make... |
1229 |
.name = "smpcfd:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1230 1231 |
.startup.single = smpcfd_prepare_cpu, .teardown.single = smpcfd_dead_cpu, |
31487f832 smp/cfd: Convert ... |
1232 |
}, |
e6d4989a9 relayfs: Convert ... |
1233 1234 1235 1236 1237 |
[CPUHP_RELAY_PREPARE] = { .name = "relay:prepare", .startup.single = relay_prepare_cpu, .teardown.single = NULL, }, |
6731d4f12 slab: Convert to ... |
1238 1239 1240 1241 |
[CPUHP_SLAB_PREPARE] = { .name = "slab:prepare", .startup.single = slab_prepare_cpu, .teardown.single = slab_dead_cpu, |
31487f832 smp/cfd: Convert ... |
1242 |
}, |
4df837425 rcu: Convert rcut... |
1243 |
[CPUHP_RCUTREE_PREP] = { |
677f66465 cpu/hotplug: Make... |
1244 |
.name = "RCU/tree:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1245 1246 |
.startup.single = rcutree_prepare_cpu, .teardown.single = rcutree_dead_cpu, |
4df837425 rcu: Convert rcut... |
1247 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1248 1249 1250 1251 |
/* * Preparatory and dead notifiers. Will be replaced once the notifiers * are converted to states. */ |
cff7d378d cpu/hotplug: Conv... |
1252 1253 |
[CPUHP_NOTIFY_PREPARE] = { .name = "notify:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1254 1255 |
.startup.single = notify_prepare, .teardown.single = notify_dead, |
cff7d378d cpu/hotplug: Conv... |
1256 |
.skip_onerr = true, |
757c989b9 cpu/hotplug: Make... |
1257 |
.cant_stop = true, |
cff7d378d cpu/hotplug: Conv... |
1258 |
}, |
4fae16dff timers/core: Corr... |
1259 1260 1261 1262 1263 1264 |
/* * On the tear-down path, timers_dead_cpu() must be invoked * before blk_mq_queue_reinit_notify() from notify_dead(), * otherwise a RCU stall occurs. */ [CPUHP_TIMERS_DEAD] = { |
3c1627e99 cpu/hotplug: Repl... |
1265 1266 1267 |
.name = "timers:dead", .startup.single = NULL, .teardown.single = timers_dead_cpu, |
4fae16dff timers/core: Corr... |
1268 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1269 |
/* Kicks the plugged cpu into life */ |
cff7d378d cpu/hotplug: Conv... |
1270 1271 |
[CPUHP_BRINGUP_CPU] = { .name = "cpu:bringup", |
3c1627e99 cpu/hotplug: Repl... |
1272 1273 |
.startup.single = bringup_cpu, .teardown.single = NULL, |
757c989b9 cpu/hotplug: Make... |
1274 |
.cant_stop = true, |
4baa0afc6 cpu/hotplug: Conv... |
1275 |
}, |
31487f832 smp/cfd: Convert ... |
1276 |
[CPUHP_AP_SMPCFD_DYING] = { |
677f66465 cpu/hotplug: Make... |
1277 |
.name = "smpcfd:dying", |
3c1627e99 cpu/hotplug: Repl... |
1278 1279 |
.startup.single = NULL, .teardown.single = smpcfd_dying_cpu, |
31487f832 smp/cfd: Convert ... |
1280 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1281 1282 1283 1284 |
/* * Handled on controll processor until the plugged processor manages * this itself. */ |
4baa0afc6 cpu/hotplug: Conv... |
1285 1286 |
[CPUHP_TEARDOWN_CPU] = { .name = "cpu:teardown", |
3c1627e99 cpu/hotplug: Repl... |
1287 1288 |
.startup.single = NULL, .teardown.single = takedown_cpu, |
757c989b9 cpu/hotplug: Make... |
1289 |
.cant_stop = true, |
cff7d378d cpu/hotplug: Conv... |
1290 |
}, |
a7c734140 cpu/hotplug: Keep... |
1291 1292 |
#else [CPUHP_BRINGUP_CPU] = { }, |
cff7d378d cpu/hotplug: Conv... |
1293 |
#endif |
cff7d378d cpu/hotplug: Conv... |
1294 |
}; |
4baa0afc6 cpu/hotplug: Conv... |
1295 1296 1297 |
/* Application processor state steps */ static struct cpuhp_step cpuhp_ap_states[] = { #ifdef CONFIG_SMP |
d10ef6f93 cpu/hotplug: Docu... |
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 |
/* 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, }, |
9cf7243d5 sched: Make set_c... |
1310 1311 1312 |
/* First state is scheduler control. Interrupts are disabled */ [CPUHP_AP_SCHED_STARTING] = { .name = "sched:starting", |
3c1627e99 cpu/hotplug: Repl... |
1313 1314 |
.startup.single = sched_cpu_starting, .teardown.single = sched_cpu_dying, |
9cf7243d5 sched: Make set_c... |
1315 |
}, |
4df837425 rcu: Convert rcut... |
1316 |
[CPUHP_AP_RCUTREE_DYING] = { |
677f66465 cpu/hotplug: Make... |
1317 |
.name = "RCU/tree:dying", |
3c1627e99 cpu/hotplug: Repl... |
1318 1319 |
.startup.single = NULL, .teardown.single = rcutree_dying_cpu, |
4baa0afc6 cpu/hotplug: Conv... |
1320 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1321 1322 1323 1324 1325 1326 |
/* Entry state on starting. Interrupts enabled from here on. Transient * state for synchronsization */ [CPUHP_AP_ONLINE] = { .name = "ap:online", }, /* Handle smpboot threads park/unpark */ |
1cf4f629d cpu/hotplug: Move... |
1327 |
[CPUHP_AP_SMPBOOT_THREADS] = { |
677f66465 cpu/hotplug: Make... |
1328 |
.name = "smpboot/threads:online", |
3c1627e99 cpu/hotplug: Repl... |
1329 1330 |
.startup.single = smpboot_unpark_threads, .teardown.single = NULL, |
1cf4f629d cpu/hotplug: Move... |
1331 |
}, |
00e16c3d6 perf/core: Conver... |
1332 |
[CPUHP_AP_PERF_ONLINE] = { |
3c1627e99 cpu/hotplug: Repl... |
1333 1334 1335 |
.name = "perf:online", .startup.single = perf_event_init_cpu, .teardown.single = perf_event_exit_cpu, |
00e16c3d6 perf/core: Conver... |
1336 |
}, |
7ee681b25 workqueue: Conver... |
1337 |
[CPUHP_AP_WORKQUEUE_ONLINE] = { |
3c1627e99 cpu/hotplug: Repl... |
1338 1339 1340 |
.name = "workqueue:online", .startup.single = workqueue_online_cpu, .teardown.single = workqueue_offline_cpu, |
7ee681b25 workqueue: Conver... |
1341 |
}, |
4df837425 rcu: Convert rcut... |
1342 |
[CPUHP_AP_RCUTREE_ONLINE] = { |
677f66465 cpu/hotplug: Make... |
1343 |
.name = "RCU/tree:online", |
3c1627e99 cpu/hotplug: Repl... |
1344 1345 |
.startup.single = rcutree_online_cpu, .teardown.single = rcutree_offline_cpu, |
4df837425 rcu: Convert rcut... |
1346 |
}, |
00e16c3d6 perf/core: Conver... |
1347 |
|
d10ef6f93 cpu/hotplug: Docu... |
1348 1349 1350 1351 |
/* * Online/down_prepare notifiers. Will be removed once the notifiers * are converted to states. */ |
1cf4f629d cpu/hotplug: Move... |
1352 1353 |
[CPUHP_AP_NOTIFY_ONLINE] = { .name = "notify:online", |
3c1627e99 cpu/hotplug: Repl... |
1354 1355 |
.startup.single = notify_online, .teardown.single = notify_down_prepare, |
3b9d6da67 cpu/hotplug: Fix ... |
1356 |
.skip_onerr = true, |
1cf4f629d cpu/hotplug: Move... |
1357 |
}, |
4baa0afc6 cpu/hotplug: Conv... |
1358 |
#endif |
d10ef6f93 cpu/hotplug: Docu... |
1359 1360 1361 |
/* * The dynamically registered state space is here */ |
aaddd7d1c sched/hotplug: Ma... |
1362 1363 1364 1365 |
#ifdef CONFIG_SMP /* Last state is scheduler control setting the cpu active */ [CPUHP_AP_ACTIVE] = { .name = "sched:active", |
3c1627e99 cpu/hotplug: Repl... |
1366 1367 |
.startup.single = sched_cpu_activate, .teardown.single = sched_cpu_deactivate, |
aaddd7d1c sched/hotplug: Ma... |
1368 1369 |
}, #endif |
d10ef6f93 cpu/hotplug: Docu... |
1370 |
/* CPU is fully up and running. */ |
4baa0afc6 cpu/hotplug: Conv... |
1371 1372 |
[CPUHP_ONLINE] = { .name = "online", |
3c1627e99 cpu/hotplug: Repl... |
1373 1374 |
.startup.single = NULL, .teardown.single = NULL, |
4baa0afc6 cpu/hotplug: Conv... |
1375 1376 |
}, }; |
5b7aa87e0 cpu/hotplug: Impl... |
1377 1378 1379 1380 1381 1382 1383 |
/* Sanity check for callbacks */ static int cpuhp_cb_check(enum cpuhp_state state) { if (state <= CPUHP_OFFLINE || state >= CPUHP_ONLINE) return -EINVAL; return 0; } |
5b7aa87e0 cpu/hotplug: Impl... |
1384 1385 1386 |
static void cpuhp_store_callbacks(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), |
cf392d10b cpu/hotplug: Add ... |
1387 1388 |
int (*teardown)(unsigned int cpu), bool multi_instance) |
5b7aa87e0 cpu/hotplug: Impl... |
1389 1390 1391 1392 1393 1394 |
{ /* (Un)Install the callbacks for further cpu hotplug operations */ struct cpuhp_step *sp; mutex_lock(&cpuhp_state_mutex); sp = cpuhp_get_step(state); |
3c1627e99 cpu/hotplug: Repl... |
1395 1396 |
sp->startup.single = startup; sp->teardown.single = teardown; |
5b7aa87e0 cpu/hotplug: Impl... |
1397 |
sp->name = name; |
cf392d10b cpu/hotplug: Add ... |
1398 1399 |
sp->multi_instance = multi_instance; INIT_HLIST_HEAD(&sp->list); |
5b7aa87e0 cpu/hotplug: Impl... |
1400 1401 1402 1403 1404 |
mutex_unlock(&cpuhp_state_mutex); } static void *cpuhp_get_teardown_cb(enum cpuhp_state state) { |
3c1627e99 cpu/hotplug: Repl... |
1405 |
return cpuhp_get_step(state)->teardown.single; |
5b7aa87e0 cpu/hotplug: Impl... |
1406 |
} |
5b7aa87e0 cpu/hotplug: Impl... |
1407 1408 1409 1410 |
/* * Call the startup/teardown function for a step either on the AP or * on the current CPU. */ |
cf392d10b cpu/hotplug: Add ... |
1411 1412 |
static int cpuhp_issue_call(int cpu, enum cpuhp_state state, bool bringup, struct hlist_node *node) |
5b7aa87e0 cpu/hotplug: Impl... |
1413 |
{ |
a724632ca cpu/hotplug: Rewo... |
1414 |
struct cpuhp_step *sp = cpuhp_get_step(state); |
5b7aa87e0 cpu/hotplug: Impl... |
1415 |
int ret; |
3c1627e99 cpu/hotplug: Repl... |
1416 1417 |
if ((bringup && !sp->startup.single) || (!bringup && !sp->teardown.single)) |
5b7aa87e0 cpu/hotplug: Impl... |
1418 |
return 0; |
5b7aa87e0 cpu/hotplug: Impl... |
1419 1420 1421 1422 |
/* * The non AP bound callbacks can fail on bringup. On teardown * e.g. module removal we crash for now. */ |
1cf4f629d cpu/hotplug: Move... |
1423 1424 |
#ifdef CONFIG_SMP if (cpuhp_is_ap_state(state)) |
cf392d10b cpu/hotplug: Add ... |
1425 |
ret = cpuhp_invoke_ap_callback(cpu, state, bringup, node); |
1cf4f629d cpu/hotplug: Move... |
1426 |
else |
cf392d10b cpu/hotplug: Add ... |
1427 |
ret = cpuhp_invoke_callback(cpu, state, bringup, node); |
1cf4f629d cpu/hotplug: Move... |
1428 |
#else |
cf392d10b cpu/hotplug: Add ... |
1429 |
ret = cpuhp_invoke_callback(cpu, state, bringup, node); |
1cf4f629d cpu/hotplug: Move... |
1430 |
#endif |
5b7aa87e0 cpu/hotplug: Impl... |
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
BUG_ON(ret && !bringup); return ret; } /* * Called from __cpuhp_setup_state on a recoverable failure. * * Note: The teardown callbacks for rollback are not allowed to fail! */ static void cpuhp_rollback_install(int failedcpu, enum cpuhp_state state, |
cf392d10b cpu/hotplug: Add ... |
1441 |
struct hlist_node *node) |
5b7aa87e0 cpu/hotplug: Impl... |
1442 1443 |
{ int cpu; |
5b7aa87e0 cpu/hotplug: Impl... |
1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 |
/* Roll back the already executed steps on the other cpus */ for_each_present_cpu(cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int cpustate = st->state; if (cpu >= failedcpu) break; /* Did we invoke the startup call on that cpu ? */ if (cpustate >= state) |
cf392d10b cpu/hotplug: Add ... |
1454 |
cpuhp_issue_call(cpu, state, false, node); |
5b7aa87e0 cpu/hotplug: Impl... |
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 |
} } /* * Returns a free for dynamic slot assignment of the Online state. The states * are protected by the cpuhp_slot_states mutex and an empty slot is identified * by having no name assigned. */ static int cpuhp_reserve_state(enum cpuhp_state state) { enum cpuhp_state i; mutex_lock(&cpuhp_state_mutex); |
1cf4f629d cpu/hotplug: Move... |
1468 1469 |
for (i = CPUHP_AP_ONLINE_DYN; i <= CPUHP_AP_ONLINE_DYN_END; i++) { if (cpuhp_ap_states[i].name) |
5b7aa87e0 cpu/hotplug: Impl... |
1470 |
continue; |
1cf4f629d cpu/hotplug: Move... |
1471 |
cpuhp_ap_states[i].name = "Reserved"; |
5b7aa87e0 cpu/hotplug: Impl... |
1472 1473 1474 1475 1476 1477 1478 1479 |
mutex_unlock(&cpuhp_state_mutex); return i; } mutex_unlock(&cpuhp_state_mutex); WARN(1, "No more dynamic states available for CPU hotplug "); return -ENOSPC; } |
cf392d10b cpu/hotplug: Add ... |
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 |
int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke) { struct cpuhp_step *sp; int cpu; int ret; sp = cpuhp_get_step(state); if (sp->multi_instance == false) return -EINVAL; get_online_cpus(); |
3c1627e99 cpu/hotplug: Repl... |
1492 |
if (!invoke || !sp->startup.multi) |
cf392d10b cpu/hotplug: Add ... |
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 |
goto add_node; /* * Try to call the startup callback for each present cpu * depending on the hotplug state of the cpu. */ for_each_present_cpu(cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int cpustate = st->state; if (cpustate < state) continue; ret = cpuhp_issue_call(cpu, state, true, node); if (ret) { |
3c1627e99 cpu/hotplug: Repl... |
1508 |
if (sp->teardown.multi) |
cf392d10b cpu/hotplug: Add ... |
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 |
cpuhp_rollback_install(cpu, state, node); goto err; } } add_node: ret = 0; mutex_lock(&cpuhp_state_mutex); hlist_add_head(node, &sp->list); mutex_unlock(&cpuhp_state_mutex); err: put_online_cpus(); return ret; } EXPORT_SYMBOL_GPL(__cpuhp_state_add_instance); |
5b7aa87e0 cpu/hotplug: Impl... |
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 |
/** * __cpuhp_setup_state - Setup the callbacks for an hotplug machine state * @state: The state to setup * @invoke: If true, the startup function is invoked for cpus where * cpu state >= @state * @startup: startup callback function * @teardown: teardown callback function * * Returns 0 if successful, otherwise a proper error code */ int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke, int (*startup)(unsigned int cpu), |
cf392d10b cpu/hotplug: Add ... |
1537 1538 |
int (*teardown)(unsigned int cpu), bool multi_instance) |
5b7aa87e0 cpu/hotplug: Impl... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 |
{ int cpu, ret = 0; int dyn_state = 0; if (cpuhp_cb_check(state) || !name) return -EINVAL; get_online_cpus(); /* currently assignments for the ONLINE state are possible */ |
1cf4f629d cpu/hotplug: Move... |
1549 |
if (state == CPUHP_AP_ONLINE_DYN) { |
5b7aa87e0 cpu/hotplug: Impl... |
1550 1551 1552 1553 1554 1555 |
dyn_state = 1; ret = cpuhp_reserve_state(state); if (ret < 0) goto out; state = ret; } |
cf392d10b cpu/hotplug: Add ... |
1556 |
cpuhp_store_callbacks(state, name, startup, teardown, multi_instance); |
5b7aa87e0 cpu/hotplug: Impl... |
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 |
if (!invoke || !startup) goto out; /* * Try to call the startup callback for each present cpu * depending on the hotplug state of the cpu. */ for_each_present_cpu(cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int cpustate = st->state; if (cpustate < state) continue; |
cf392d10b cpu/hotplug: Add ... |
1571 |
ret = cpuhp_issue_call(cpu, state, true, NULL); |
5b7aa87e0 cpu/hotplug: Impl... |
1572 |
if (ret) { |
a724632ca cpu/hotplug: Rewo... |
1573 |
if (teardown) |
cf392d10b cpu/hotplug: Add ... |
1574 1575 |
cpuhp_rollback_install(cpu, state, NULL); cpuhp_store_callbacks(state, NULL, NULL, NULL, false); |
5b7aa87e0 cpu/hotplug: Impl... |
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 |
goto out; } } out: put_online_cpus(); if (!ret && dyn_state) return state; return ret; } EXPORT_SYMBOL(__cpuhp_setup_state); |
cf392d10b cpu/hotplug: Add ... |
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 |
int __cpuhp_state_remove_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke) { struct cpuhp_step *sp = cpuhp_get_step(state); int cpu; BUG_ON(cpuhp_cb_check(state)); if (!sp->multi_instance) return -EINVAL; get_online_cpus(); if (!invoke || !cpuhp_get_teardown_cb(state)) goto remove; /* * Call the teardown callback for each present cpu depending * on the hotplug state of the cpu. This function is not * allowed to fail currently! */ for_each_present_cpu(cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int cpustate = st->state; if (cpustate >= state) cpuhp_issue_call(cpu, state, false, node); } remove: mutex_lock(&cpuhp_state_mutex); hlist_del(node); mutex_unlock(&cpuhp_state_mutex); put_online_cpus(); return 0; } EXPORT_SYMBOL_GPL(__cpuhp_state_remove_instance); |
5b7aa87e0 cpu/hotplug: Impl... |
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 |
/** * __cpuhp_remove_state - Remove the callbacks for an hotplug machine state * @state: The state to remove * @invoke: If true, the teardown function is invoked for cpus where * cpu state >= @state * * The teardown callback is currently not allowed to fail. Think * about module removal! */ void __cpuhp_remove_state(enum cpuhp_state state, bool invoke) { |
cf392d10b cpu/hotplug: Add ... |
1633 |
struct cpuhp_step *sp = cpuhp_get_step(state); |
5b7aa87e0 cpu/hotplug: Impl... |
1634 1635 1636 1637 1638 |
int cpu; BUG_ON(cpuhp_cb_check(state)); get_online_cpus(); |
cf392d10b cpu/hotplug: Add ... |
1639 1640 1641 1642 1643 1644 1645 |
if (sp->multi_instance) { WARN(!hlist_empty(&sp->list), "Error: Removing state %d which has instances left. ", state); goto remove; } |
a724632ca cpu/hotplug: Rewo... |
1646 |
if (!invoke || !cpuhp_get_teardown_cb(state)) |
5b7aa87e0 cpu/hotplug: Impl... |
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 |
goto remove; /* * Call the teardown callback for each present cpu depending * on the hotplug state of the cpu. This function is not * allowed to fail currently! */ for_each_present_cpu(cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int cpustate = st->state; if (cpustate >= state) |
cf392d10b cpu/hotplug: Add ... |
1659 |
cpuhp_issue_call(cpu, state, false, NULL); |
5b7aa87e0 cpu/hotplug: Impl... |
1660 1661 |
} remove: |
cf392d10b cpu/hotplug: Add ... |
1662 |
cpuhp_store_callbacks(state, NULL, NULL, NULL, false); |
5b7aa87e0 cpu/hotplug: Impl... |
1663 1664 1665 |
put_online_cpus(); } EXPORT_SYMBOL(__cpuhp_remove_state); |
98f8cdce1 cpu/hotplug: Add ... |
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 |
#if defined(CONFIG_SYSFS) && defined(CONFIG_HOTPLUG_CPU) static ssize_t show_cpuhp_state(struct device *dev, struct device_attribute *attr, char *buf) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, dev->id); return sprintf(buf, "%d ", st->state); } static DEVICE_ATTR(state, 0444, show_cpuhp_state, NULL); |
757c989b9 cpu/hotplug: Make... |
1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 |
static ssize_t write_cpuhp_target(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, dev->id); struct cpuhp_step *sp; int target, ret; ret = kstrtoint(buf, 10, &target); if (ret) return ret; #ifdef CONFIG_CPU_HOTPLUG_STATE_CONTROL if (target < CPUHP_OFFLINE || target > CPUHP_ONLINE) return -EINVAL; #else if (target != CPUHP_OFFLINE && target != CPUHP_ONLINE) return -EINVAL; #endif ret = lock_device_hotplug_sysfs(); if (ret) return ret; mutex_lock(&cpuhp_state_mutex); sp = cpuhp_get_step(target); ret = !sp->name || sp->cant_stop ? -EINVAL : 0; mutex_unlock(&cpuhp_state_mutex); if (ret) return ret; if (st->state < target) ret = do_cpu_up(dev->id, target); else ret = do_cpu_down(dev->id, target); unlock_device_hotplug(); return ret ? ret : count; } |
98f8cdce1 cpu/hotplug: Add ... |
1715 1716 1717 1718 1719 1720 1721 1722 |
static ssize_t show_cpuhp_target(struct device *dev, struct device_attribute *attr, char *buf) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, dev->id); return sprintf(buf, "%d ", st->target); } |
757c989b9 cpu/hotplug: Make... |
1723 |
static DEVICE_ATTR(target, 0644, show_cpuhp_target, write_cpuhp_target); |
98f8cdce1 cpu/hotplug: Add ... |
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 |
static struct attribute *cpuhp_cpu_attrs[] = { &dev_attr_state.attr, &dev_attr_target.attr, NULL }; static struct attribute_group cpuhp_cpu_attr_group = { .attrs = cpuhp_cpu_attrs, .name = "hotplug", NULL }; static ssize_t show_cpuhp_states(struct device *dev, struct device_attribute *attr, char *buf) { ssize_t cur, res = 0; int i; mutex_lock(&cpuhp_state_mutex); |
757c989b9 cpu/hotplug: Make... |
1744 |
for (i = CPUHP_OFFLINE; i <= CPUHP_ONLINE; i++) { |
98f8cdce1 cpu/hotplug: Add ... |
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 |
struct cpuhp_step *sp = cpuhp_get_step(i); if (sp->name) { cur = sprintf(buf, "%3d: %s ", i, sp->name); buf += cur; res += cur; } } mutex_unlock(&cpuhp_state_mutex); return res; } static DEVICE_ATTR(states, 0444, show_cpuhp_states, NULL); static struct attribute *cpuhp_cpu_root_attrs[] = { &dev_attr_states.attr, NULL }; static struct attribute_group cpuhp_cpu_root_attr_group = { .attrs = cpuhp_cpu_root_attrs, .name = "hotplug", NULL }; static int __init cpuhp_sysfs_init(void) { int cpu, ret; ret = sysfs_create_group(&cpu_subsys.dev_root->kobj, &cpuhp_cpu_root_attr_group); if (ret) return ret; for_each_possible_cpu(cpu) { struct device *dev = get_cpu_device(cpu); if (!dev) continue; ret = sysfs_create_group(&dev->kobj, &cpuhp_cpu_attr_group); if (ret) return ret; } return 0; } device_initcall(cpuhp_sysfs_init); #endif |
e56b3bc79 cpu masks: optimi... |
1792 1793 1794 1795 |
/* * cpu_bit_bitmap[] is a special, "compressed" data structure that * represents all NR_CPUS bits binary values of 1<<nr. * |
e0b582ec5 cpumask: convert ... |
1796 |
* It is used by cpumask_of() to get a constant address to a CPU |
e56b3bc79 cpu masks: optimi... |
1797 1798 |
* mask value that has a single bit set only. */ |
b8d317d10 cpumask: make cpu... |
1799 |
|
e56b3bc79 cpu masks: optimi... |
1800 |
/* cpu_bit_bitmap[0] is empty - so we can back into it */ |
4d51985e4 kernel/cpu.c: fix... |
1801 |
#define MASK_DECLARE_1(x) [x+1][0] = (1UL << (x)) |
e56b3bc79 cpu masks: optimi... |
1802 1803 1804 |
#define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) |
b8d317d10 cpumask: make cpu... |
1805 |
|
e56b3bc79 cpu masks: optimi... |
1806 1807 1808 1809 1810 1811 1812 |
const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { MASK_DECLARE_8(0), MASK_DECLARE_8(8), MASK_DECLARE_8(16), MASK_DECLARE_8(24), #if BITS_PER_LONG > 32 MASK_DECLARE_8(32), MASK_DECLARE_8(40), MASK_DECLARE_8(48), MASK_DECLARE_8(56), |
b8d317d10 cpumask: make cpu... |
1813 1814 |
#endif }; |
e56b3bc79 cpu masks: optimi... |
1815 |
EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
2d3854a37 cpumask: introduc... |
1816 1817 1818 |
const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; EXPORT_SYMBOL(cpu_all_bits); |
b3199c025 cpumask: switch o... |
1819 1820 |
#ifdef CONFIG_INIT_ALL_POSSIBLE |
4b804c85d kernel/cpu.c: exp... |
1821 |
struct cpumask __cpu_possible_mask __read_mostly |
c4c54dd1c kernel/cpu.c: cha... |
1822 |
= {CPU_BITS_ALL}; |
b3199c025 cpumask: switch o... |
1823 |
#else |
4b804c85d kernel/cpu.c: exp... |
1824 |
struct cpumask __cpu_possible_mask __read_mostly; |
b3199c025 cpumask: switch o... |
1825 |
#endif |
4b804c85d kernel/cpu.c: exp... |
1826 |
EXPORT_SYMBOL(__cpu_possible_mask); |
b3199c025 cpumask: switch o... |
1827 |
|
4b804c85d kernel/cpu.c: exp... |
1828 1829 |
struct cpumask __cpu_online_mask __read_mostly; EXPORT_SYMBOL(__cpu_online_mask); |
b3199c025 cpumask: switch o... |
1830 |
|
4b804c85d kernel/cpu.c: exp... |
1831 1832 |
struct cpumask __cpu_present_mask __read_mostly; EXPORT_SYMBOL(__cpu_present_mask); |
b3199c025 cpumask: switch o... |
1833 |
|
4b804c85d kernel/cpu.c: exp... |
1834 1835 |
struct cpumask __cpu_active_mask __read_mostly; EXPORT_SYMBOL(__cpu_active_mask); |
3fa415206 cpumask: make set... |
1836 |
|
3fa415206 cpumask: make set... |
1837 1838 |
void init_cpu_present(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
1839 |
cpumask_copy(&__cpu_present_mask, src); |
3fa415206 cpumask: make set... |
1840 1841 1842 1843 |
} void init_cpu_possible(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
1844 |
cpumask_copy(&__cpu_possible_mask, src); |
3fa415206 cpumask: make set... |
1845 1846 1847 1848 |
} void init_cpu_online(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
1849 |
cpumask_copy(&__cpu_online_mask, src); |
3fa415206 cpumask: make set... |
1850 |
} |
cff7d378d cpu/hotplug: Conv... |
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 |
/* * Activate the first processor. */ void __init boot_cpu_init(void) { int cpu = smp_processor_id(); /* Mark the boot cpu "present", "online" etc for SMP and UP case */ set_cpu_online(cpu, true); set_cpu_active(cpu, true); set_cpu_present(cpu, true); set_cpu_possible(cpu, true); } /* * Must be called _AFTER_ setting up the per_cpu areas */ void __init boot_cpu_state_init(void) { per_cpu_ptr(&cpuhp_state, smp_processor_id())->state = CPUHP_ONLINE; } |
ac9c69731 Move x86_64 idle ... |
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 |
static ATOMIC_NOTIFIER_HEAD(idle_notifier); void idle_notifier_register(struct notifier_block *n) { atomic_notifier_chain_register(&idle_notifier, n); } EXPORT_SYMBOL_GPL(idle_notifier_register); void idle_notifier_unregister(struct notifier_block *n) { atomic_notifier_chain_unregister(&idle_notifier, n); } EXPORT_SYMBOL_GPL(idle_notifier_unregister); void idle_notifier_call_chain(unsigned long val) { atomic_notifier_call_chain(&idle_notifier, val, NULL); } EXPORT_SYMBOL_GPL(idle_notifier_call_chain); |