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kernel/cpu.c
55 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> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/hotplug.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/smt.h> |
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#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/nmi.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 <linux/percpu-rwsem.h> |
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|
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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 |
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* @done_up: Signal completion to the issuer of the task for cpu-up * @done_down: Signal completion to the issuer of the task for cpu-down |
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*/ struct cpuhp_cpu_state { enum cpuhp_state state; enum cpuhp_state target; |
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enum cpuhp_state fail; |
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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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bool booted_once; |
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struct hlist_node *node; |
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struct hlist_node *last; |
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enum cpuhp_state cb_state; |
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int result; |
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struct completion done_up; struct completion done_down; |
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#endif |
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}; |
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static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state) = { .fail = CPUHP_INVALID, }; |
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|
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#if defined(CONFIG_LOCKDEP) && defined(CONFIG_SMP) |
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static struct lockdep_map cpuhp_state_up_map = STATIC_LOCKDEP_MAP_INIT("cpuhp_state-up", &cpuhp_state_up_map); static struct lockdep_map cpuhp_state_down_map = STATIC_LOCKDEP_MAP_INIT("cpuhp_state-down", &cpuhp_state_down_map); static void inline cpuhp_lock_acquire(bool bringup) { lock_map_acquire(bringup ? &cpuhp_state_up_map : &cpuhp_state_down_map); } static void inline cpuhp_lock_release(bool bringup) { lock_map_release(bringup ? &cpuhp_state_up_map : &cpuhp_state_down_map); } #else static void inline cpuhp_lock_acquire(bool bringup) { } static void inline cpuhp_lock_release(bool bringup) { } |
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#endif |
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/** * 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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|
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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 |
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* @state: The state to do callbacks for |
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* @bringup: True if the bringup callback should be invoked |
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* @node: For multi-instance, do a single entry callback for install/remove * @lastp: For multi-instance rollback, remember how far we got |
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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, struct hlist_node **lastp) |
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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; |
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if (st->fail == state) { st->fail = CPUHP_INVALID; if (!(bringup ? step->startup.single : step->teardown.single)) return 0; return -EAGAIN; } |
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if (!step->multi_instance) { |
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WARN_ON_ONCE(lastp && *lastp); |
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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) { |
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WARN_ON_ONCE(lastp && *lastp); |
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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) { |
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if (lastp && node == *lastp) break; |
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trace_cpuhp_multi_enter(cpu, st->target, state, cbm, node); ret = cbm(cpu, node); trace_cpuhp_exit(cpu, st->state, state, ret); |
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if (ret) { if (!lastp) goto err; *lastp = node; return ret; } |
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cnt++; } |
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if (lastp) *lastp = NULL; |
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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; |
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trace_cpuhp_multi_enter(cpu, st->target, state, cbm, node); ret = cbm(cpu, node); trace_cpuhp_exit(cpu, st->state, state, ret); /* * Rollback must not fail, */ WARN_ON_ONCE(ret); |
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} return ret; } |
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#ifdef CONFIG_SMP |
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static inline void wait_for_ap_thread(struct cpuhp_cpu_state *st, bool bringup) { struct completion *done = bringup ? &st->done_up : &st->done_down; wait_for_completion(done); } static inline void complete_ap_thread(struct cpuhp_cpu_state *st, bool bringup) { struct completion *done = bringup ? &st->done_up : &st->done_down; complete(done); } /* * The former STARTING/DYING states, ran with IRQs disabled and must not fail. */ static bool cpuhp_is_atomic_state(enum cpuhp_state state) { return CPUHP_AP_IDLE_DEAD <= state && state < CPUHP_AP_ONLINE; } |
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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. |
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*/ void cpu_maps_update_begin(void) { mutex_lock(&cpu_add_remove_lock); } void cpu_maps_update_done(void) { mutex_unlock(&cpu_add_remove_lock); } |
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/* * If set, cpu_up and cpu_down will return -EBUSY and do nothing. |
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* 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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DEFINE_STATIC_PERCPU_RWSEM(cpu_hotplug_lock); |
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|
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void cpus_read_lock(void) |
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{ |
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percpu_down_read(&cpu_hotplug_lock); |
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} |
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EXPORT_SYMBOL_GPL(cpus_read_lock); |
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|
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void cpus_read_unlock(void) |
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{ |
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percpu_up_read(&cpu_hotplug_lock); |
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} |
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EXPORT_SYMBOL_GPL(cpus_read_unlock); |
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|
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void cpus_write_lock(void) |
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{ |
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percpu_down_write(&cpu_hotplug_lock); |
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} |
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void cpus_write_unlock(void) |
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{ |
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percpu_up_write(&cpu_hotplug_lock); |
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} |
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void lockdep_assert_cpus_held(void) |
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{ |
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percpu_rwsem_assert_held(&cpu_hotplug_lock); |
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} |
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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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/* * Architectures that need SMT-specific errata handling during SMT hotplug * should override this. */ void __weak arch_smt_update(void) { } |
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#ifdef CONFIG_HOTPLUG_SMT enum cpuhp_smt_control cpu_smt_control __read_mostly = CPU_SMT_ENABLED; |
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EXPORT_SYMBOL_GPL(cpu_smt_control); |
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|
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static bool cpu_smt_available __read_mostly; |
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void __init cpu_smt_disable(bool force) |
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{ |
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if (cpu_smt_control == CPU_SMT_FORCE_DISABLED || cpu_smt_control == CPU_SMT_NOT_SUPPORTED) return; if (force) { |
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pr_info("SMT: Force disabled "); cpu_smt_control = CPU_SMT_FORCE_DISABLED; |
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} else { cpu_smt_control = CPU_SMT_DISABLED; |
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} |
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} |
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/* * The decision whether SMT is supported can only be done after the full |
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* CPU identification. Called from architecture code before non boot CPUs * are brought up. |
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*/ |
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void __init cpu_smt_check_topology_early(void) |
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{ if (!topology_smt_supported()) cpu_smt_control = CPU_SMT_NOT_SUPPORTED; } |
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/* * If SMT was disabled by BIOS, detect it here, after the CPUs have been * brought online. This ensures the smt/l1tf sysfs entries are consistent * with reality. cpu_smt_available is set to true during the bringup of non * boot CPUs when a SMT sibling is detected. Note, this may overwrite * cpu_smt_control's previous setting. */ void __init cpu_smt_check_topology(void) { if (!cpu_smt_available) cpu_smt_control = CPU_SMT_NOT_SUPPORTED; } |
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static int __init smt_cmdline_disable(char *str) { cpu_smt_disable(str && !strcmp(str, "force")); |
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return 0; } early_param("nosmt", smt_cmdline_disable); static inline bool cpu_smt_allowed(unsigned int cpu) { |
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if (topology_is_primary_thread(cpu)) |
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return true; |
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/* * If the CPU is not a 'primary' thread and the booted_once bit is * set then the processor has SMT support. Store this information * for the late check of SMT support in cpu_smt_check_topology(). */ if (per_cpu(cpuhp_state, cpu).booted_once) cpu_smt_available = true; if (cpu_smt_control == CPU_SMT_ENABLED) |
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return true; /* * On x86 it's required to boot all logical CPUs at least once so * that the init code can get a chance to set CR4.MCE on each * CPU. Otherwise, a broadacasted MCE observing CR4.MCE=0b on any * core will shutdown the machine. */ return !per_cpu(cpuhp_state, cpu).booted_once; } #else static inline bool cpu_smt_allowed(unsigned int cpu) { return true; } #endif |
4dddfb5fa smp/hotplug: Rewr... |
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static inline enum cpuhp_state cpuhp_set_state(struct cpuhp_cpu_state *st, enum cpuhp_state target) { enum cpuhp_state prev_state = st->state; st->rollback = false; st->last = NULL; st->target = target; st->single = false; st->bringup = st->state < target; return prev_state; } static inline void cpuhp_reset_state(struct cpuhp_cpu_state *st, enum cpuhp_state prev_state) { st->rollback = true; /* * If we have st->last we need to undo partial multi_instance of this * state first. Otherwise start undo at the previous state. */ if (!st->last) { if (st->bringup) st->state--; else st->state++; } st->target = prev_state; st->bringup = !st->bringup; } /* Regular hotplug invocation of the AP hotplug thread */ static void __cpuhp_kick_ap(struct cpuhp_cpu_state *st) { if (!st->single && st->state == st->target) return; st->result = 0; /* * 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); |
5ebe7742f smp/hotplug: Diff... |
465 |
wait_for_ap_thread(st, st->bringup); |
4dddfb5fa smp/hotplug: Rewr... |
466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 |
} static int cpuhp_kick_ap(struct cpuhp_cpu_state *st, enum cpuhp_state target) { enum cpuhp_state prev_state; int ret; prev_state = cpuhp_set_state(st, target); __cpuhp_kick_ap(st); if ((ret = st->result)) { cpuhp_reset_state(st, prev_state); __cpuhp_kick_ap(st); } return ret; } |
9cd4f1a4e smp/hotplug: Move... |
482 |
|
8df3e07e7 cpu/hotplug: Let ... |
483 484 485 |
static int bringup_wait_for_ap(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
9cd4f1a4e smp/hotplug: Move... |
486 |
/* Wait for the CPU to reach CPUHP_AP_ONLINE_IDLE */ |
5ebe7742f smp/hotplug: Diff... |
487 |
wait_for_ap_thread(st, true); |
dea1d0f5f smp/hotplug: Repl... |
488 489 |
if (WARN_ON_ONCE((!cpu_online(cpu)))) return -ECANCELED; |
9cd4f1a4e smp/hotplug: Move... |
490 491 492 493 |
/* Unpark the stopper thread and the hotplug thread of the target cpu */ stop_machine_unpark(cpu); kthread_unpark(st->thread); |
7f2229c92 cpu/hotplug: Boot... |
494 495 496 497 498 499 500 501 502 |
/* * SMT soft disabling on X86 requires to bring the CPU out of the * BIOS 'wait for SIPI' state in order to set the CR4.MCE bit. The * CPU marked itself as booted_once in cpu_notify_starting() so the * cpu_smt_allowed() check will now return false if this is not the * primary sibling. */ if (!cpu_smt_allowed(cpu)) return -ECANCELED; |
4dddfb5fa smp/hotplug: Rewr... |
503 504 505 506 |
if (st->target <= CPUHP_AP_ONLINE_IDLE) return 0; return cpuhp_kick_ap(st, st->target); |
8df3e07e7 cpu/hotplug: Let ... |
507 |
} |
ba9974624 cpu/hotplug: Rest... |
508 509 510 511 |
static int bringup_cpu(unsigned int cpu) { struct task_struct *idle = idle_thread_get(cpu); int ret; |
aa877175e cpu/hotplug: Prev... |
512 513 514 515 516 517 |
/* * 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(); |
ba9974624 cpu/hotplug: Rest... |
518 519 |
/* Arch-specific enabling code. */ ret = __cpu_up(cpu, idle); |
aa877175e cpu/hotplug: Prev... |
520 |
irq_unlock_sparse(); |
530e9b76a cpu/hotplug: Remo... |
521 |
if (ret) |
ba9974624 cpu/hotplug: Rest... |
522 |
return ret; |
9cd4f1a4e smp/hotplug: Move... |
523 |
return bringup_wait_for_ap(cpu); |
ba9974624 cpu/hotplug: Rest... |
524 |
} |
2e1a3483c cpu/hotplug: Spli... |
525 526 527 |
/* * Hotplug state machine related functions */ |
2e1a3483c cpu/hotplug: Spli... |
528 |
|
a724632ca cpu/hotplug: Rewo... |
529 |
static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st) |
2e1a3483c cpu/hotplug: Spli... |
530 531 |
{ for (st->state--; st->state > st->target; st->state--) { |
a724632ca cpu/hotplug: Rewo... |
532 |
struct cpuhp_step *step = cpuhp_get_step(st->state); |
2e1a3483c cpu/hotplug: Spli... |
533 534 |
if (!step->skip_onerr) |
96abb9685 smp/hotplug: Allo... |
535 |
cpuhp_invoke_callback(cpu, st->state, false, NULL, NULL); |
2e1a3483c cpu/hotplug: Spli... |
536 537 538 539 |
} } static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st, |
a724632ca cpu/hotplug: Rewo... |
540 |
enum cpuhp_state target) |
2e1a3483c cpu/hotplug: Spli... |
541 542 543 544 545 |
{ enum cpuhp_state prev_state = st->state; int ret = 0; while (st->state < target) { |
2e1a3483c cpu/hotplug: Spli... |
546 |
st->state++; |
96abb9685 smp/hotplug: Allo... |
547 |
ret = cpuhp_invoke_callback(cpu, st->state, true, NULL, NULL); |
2e1a3483c cpu/hotplug: Spli... |
548 549 |
if (ret) { st->target = prev_state; |
a724632ca cpu/hotplug: Rewo... |
550 |
undo_cpu_up(cpu, st); |
2e1a3483c cpu/hotplug: Spli... |
551 552 553 554 555 |
break; } } return ret; } |
4cb28ced2 cpu/hotplug: Crea... |
556 557 558 559 560 561 |
/* * 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); |
5ebe7742f smp/hotplug: Diff... |
562 563 |
init_completion(&st->done_up); init_completion(&st->done_down); |
4cb28ced2 cpu/hotplug: Crea... |
564 565 566 567 568 569 570 571 |
} static int cpuhp_should_run(unsigned int cpu) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); return st->should_run; } |
4cb28ced2 cpu/hotplug: Crea... |
572 573 574 |
/* * Execute teardown/startup callbacks on the plugged cpu. Also used to invoke * callbacks when a state gets [un]installed at runtime. |
4dddfb5fa smp/hotplug: Rewr... |
575 576 577 578 579 580 581 582 583 584 |
* * Each invocation of this function by the smpboot thread does a single AP * state callback. * * It has 3 modes of operation: * - single: runs st->cb_state * - up: runs ++st->state, while st->state < st->target * - down: runs st->state--, while st->state > st->target * * When complete or on error, should_run is cleared and the completion is fired. |
4cb28ced2 cpu/hotplug: Crea... |
585 586 587 588 |
*/ static void cpuhp_thread_fun(unsigned int cpu) { struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); |
4dddfb5fa smp/hotplug: Rewr... |
589 590 |
bool bringup = st->bringup; enum cpuhp_state state; |
4cb28ced2 cpu/hotplug: Crea... |
591 |
|
cb2625854 cpu/hotplug: Adju... |
592 593 |
if (WARN_ON_ONCE(!st->should_run)) return; |
4cb28ced2 cpu/hotplug: Crea... |
594 |
/* |
4dddfb5fa smp/hotplug: Rewr... |
595 596 |
* ACQUIRE for the cpuhp_should_run() load of ->should_run. Ensures * that if we see ->should_run we also see the rest of the state. |
4cb28ced2 cpu/hotplug: Crea... |
597 598 |
*/ smp_mb(); |
4cb28ced2 cpu/hotplug: Crea... |
599 |
|
5f4b55e10 smp/hotplug: Diff... |
600 |
cpuhp_lock_acquire(bringup); |
4dddfb5fa smp/hotplug: Rewr... |
601 |
|
a724632ca cpu/hotplug: Rewo... |
602 |
if (st->single) { |
4dddfb5fa smp/hotplug: Rewr... |
603 604 605 606 607 608 609 610 |
state = st->cb_state; st->should_run = false; } else { if (bringup) { st->state++; state = st->state; st->should_run = (st->state < st->target); WARN_ON_ONCE(st->state > st->target); |
4cb28ced2 cpu/hotplug: Crea... |
611 |
} else { |
4dddfb5fa smp/hotplug: Rewr... |
612 613 614 615 |
state = st->state; st->state--; st->should_run = (st->state > st->target); WARN_ON_ONCE(st->state < st->target); |
4cb28ced2 cpu/hotplug: Crea... |
616 |
} |
4dddfb5fa smp/hotplug: Rewr... |
617 618 619 620 621 622 623 624 625 626 627 628 629 630 |
} WARN_ON_ONCE(!cpuhp_is_ap_state(state)); if (st->rollback) { struct cpuhp_step *step = cpuhp_get_step(state); if (step->skip_onerr) goto next; } if (cpuhp_is_atomic_state(state)) { local_irq_disable(); st->result = cpuhp_invoke_callback(cpu, state, bringup, st->node, &st->last); local_irq_enable(); |
3b9d6da67 cpu/hotplug: Fix ... |
631 |
|
4dddfb5fa smp/hotplug: Rewr... |
632 633 634 635 |
/* * STARTING/DYING must not fail! */ WARN_ON_ONCE(st->result); |
4cb28ced2 cpu/hotplug: Crea... |
636 |
} else { |
4dddfb5fa smp/hotplug: Rewr... |
637 638 639 640 641 642 643 644 645 646 647 |
st->result = cpuhp_invoke_callback(cpu, state, bringup, st->node, &st->last); } if (st->result) { /* * If we fail on a rollback, we're up a creek without no * paddle, no way forward, no way back. We loose, thanks for * playing. */ WARN_ON_ONCE(st->rollback); st->should_run = false; |
4cb28ced2 cpu/hotplug: Crea... |
648 |
} |
4dddfb5fa smp/hotplug: Rewr... |
649 650 |
next: |
5f4b55e10 smp/hotplug: Diff... |
651 |
cpuhp_lock_release(bringup); |
4dddfb5fa smp/hotplug: Rewr... |
652 653 |
if (!st->should_run) |
5ebe7742f smp/hotplug: Diff... |
654 |
complete_ap_thread(st, bringup); |
4cb28ced2 cpu/hotplug: Crea... |
655 656 657 |
} /* Invoke a single callback on a remote cpu */ |
a724632ca cpu/hotplug: Rewo... |
658 |
static int |
cf392d10b cpu/hotplug: Add ... |
659 660 |
cpuhp_invoke_ap_callback(int cpu, enum cpuhp_state state, bool bringup, struct hlist_node *node) |
4cb28ced2 cpu/hotplug: Crea... |
661 662 |
{ struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
4dddfb5fa smp/hotplug: Rewr... |
663 |
int ret; |
4cb28ced2 cpu/hotplug: Crea... |
664 665 666 |
if (!cpu_online(cpu)) return 0; |
5f4b55e10 smp/hotplug: Diff... |
667 668 669 670 671 |
cpuhp_lock_acquire(false); cpuhp_lock_release(false); cpuhp_lock_acquire(true); cpuhp_lock_release(true); |
49dfe2a67 cpuhotplug: Link ... |
672 |
|
6a4e24518 cpu/hotplug: Hand... |
673 674 675 676 677 |
/* * If we are up and running, use the hotplug thread. For early calls * we invoke the thread function directly. */ if (!st->thread) |
96abb9685 smp/hotplug: Allo... |
678 |
return cpuhp_invoke_callback(cpu, state, bringup, node, NULL); |
6a4e24518 cpu/hotplug: Hand... |
679 |
|
4dddfb5fa smp/hotplug: Rewr... |
680 681 682 683 684 |
st->rollback = false; st->last = NULL; st->node = node; st->bringup = bringup; |
4cb28ced2 cpu/hotplug: Crea... |
685 |
st->cb_state = state; |
a724632ca cpu/hotplug: Rewo... |
686 |
st->single = true; |
a724632ca cpu/hotplug: Rewo... |
687 |
|
4dddfb5fa smp/hotplug: Rewr... |
688 |
__cpuhp_kick_ap(st); |
4cb28ced2 cpu/hotplug: Crea... |
689 |
|
4cb28ced2 cpu/hotplug: Crea... |
690 |
/* |
4dddfb5fa smp/hotplug: Rewr... |
691 |
* If we failed and did a partial, do a rollback. |
4cb28ced2 cpu/hotplug: Crea... |
692 |
*/ |
4dddfb5fa smp/hotplug: Rewr... |
693 694 695 696 697 698 |
if ((ret = st->result) && st->last) { st->rollback = true; st->bringup = !bringup; __cpuhp_kick_ap(st); } |
1f7c70d6b cpu/hotplug: Rese... |
699 700 701 702 703 |
/* * Clean up the leftovers so the next hotplug operation wont use stale * data. */ st->node = st->last = NULL; |
4dddfb5fa smp/hotplug: Rewr... |
704 |
return ret; |
1cf4f629d cpu/hotplug: Move... |
705 706 707 708 709 |
} static int cpuhp_kick_ap_work(unsigned int cpu) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
4dddfb5fa smp/hotplug: Rewr... |
710 711 |
enum cpuhp_state prev_state = st->state; int ret; |
1cf4f629d cpu/hotplug: Move... |
712 |
|
5f4b55e10 smp/hotplug: Diff... |
713 714 715 716 717 |
cpuhp_lock_acquire(false); cpuhp_lock_release(false); cpuhp_lock_acquire(true); cpuhp_lock_release(true); |
4dddfb5fa smp/hotplug: Rewr... |
718 719 720 721 722 723 |
trace_cpuhp_enter(cpu, st->target, prev_state, cpuhp_kick_ap_work); ret = cpuhp_kick_ap(st, st->target); trace_cpuhp_exit(cpu, st->state, prev_state, ret); return ret; |
4cb28ced2 cpu/hotplug: Crea... |
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 |
} 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)); } |
777c6e0da hotplug: Make reg... |
740 |
#ifdef CONFIG_HOTPLUG_CPU |
e4cc2f873 kernel/cpu.c: doc... |
741 742 743 744 745 746 747 748 749 750 751 752 |
/** * 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... |
753 754 755 756 757 758 759 760 761 762 763 |
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... |
764 |
WARN_ON(cpu_online(cpu)); |
cb79295e2 cpu: introduce cl... |
765 766 767 |
rcu_read_lock(); for_each_process(p) { struct task_struct *t; |
e4cc2f873 kernel/cpu.c: doc... |
768 769 770 771 |
/* * Main thread might exit, but other threads may still have * a valid mm. Find one. */ |
cb79295e2 cpu: introduce cl... |
772 773 774 775 776 777 778 779 |
t = find_lock_task_mm(p); if (!t) continue; cpumask_clear_cpu(cpu, mm_cpumask(t->mm)); task_unlock(t); } rcu_read_unlock(); } |
1da177e4c Linux-2.6.12-rc2 |
780 |
/* Take this CPU down. */ |
71cf5aeeb kernel, cpu: Remo... |
781 |
static int take_cpu_down(void *_param) |
1da177e4c Linux-2.6.12-rc2 |
782 |
{ |
4baa0afc6 cpu/hotplug: Conv... |
783 784 |
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... |
785 |
int err, cpu = smp_processor_id(); |
724a86881 smp/hotplug: Call... |
786 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
787 |
|
1da177e4c Linux-2.6.12-rc2 |
788 789 790 |
/* Ensure this CPU doesn't handle any more interrupts. */ err = __cpu_disable(); if (err < 0) |
f37051364 [PATCH] i386 CPU ... |
791 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
792 |
|
a724632ca cpu/hotplug: Rewo... |
793 794 795 796 797 798 |
/* * 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... |
799 |
/* Invoke the former CPU_DYING callbacks */ |
724a86881 smp/hotplug: Call... |
800 801 802 803 804 805 806 |
for (; st->state > target; st->state--) { ret = cpuhp_invoke_callback(cpu, st->state, false, NULL, NULL); /* * DYING must not fail! */ WARN_ON_ONCE(ret); } |
4baa0afc6 cpu/hotplug: Conv... |
807 |
|
52c063d1a clockevents: Make... |
808 809 |
/* Give up timekeeping duties */ tick_handover_do_timer(); |
14e568e78 stop_machine: Use... |
810 |
/* Park the stopper thread */ |
090e77c39 cpu/hotplug: Rest... |
811 |
stop_machine_park(cpu); |
f37051364 [PATCH] i386 CPU ... |
812 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
813 |
} |
984581728 cpu/hotplug: Spli... |
814 |
static int takedown_cpu(unsigned int cpu) |
1da177e4c Linux-2.6.12-rc2 |
815 |
{ |
e69aab131 cpu/hotplug: Make... |
816 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
984581728 cpu/hotplug: Spli... |
817 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
818 |
|
2a58c527b cpu/hotplug: Fix ... |
819 |
/* Park the smpboot threads */ |
1cf4f629d cpu/hotplug: Move... |
820 |
kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread); |
6acce3ef8 sched: Remove get... |
821 |
/* |
a89941816 hotplug: Prevent ... |
822 823 |
* Prevent irq alloc/free while the dying cpu reorganizes the * interrupt affinities. |
6acce3ef8 sched: Remove get... |
824 |
*/ |
a89941816 hotplug: Prevent ... |
825 |
irq_lock_sparse(); |
6acce3ef8 sched: Remove get... |
826 |
|
a89941816 hotplug: Prevent ... |
827 828 829 |
/* * So now all preempt/rcu users must observe !cpu_active(). */ |
210e21331 cpu/hotplug: Use ... |
830 |
err = stop_machine_cpuslocked(take_cpu_down, NULL, cpumask_of(cpu)); |
043215875 Hotplug CPU: don'... |
831 |
if (err) { |
3b9d6da67 cpu/hotplug: Fix ... |
832 |
/* CPU refused to die */ |
a89941816 hotplug: Prevent ... |
833 |
irq_unlock_sparse(); |
3b9d6da67 cpu/hotplug: Fix ... |
834 835 |
/* Unpark the hotplug thread so we can rollback there */ kthread_unpark(per_cpu_ptr(&cpuhp_state, cpu)->thread); |
984581728 cpu/hotplug: Spli... |
836 |
return err; |
8fa1d7d3b [PATCH] cpu-hotpl... |
837 |
} |
043215875 Hotplug CPU: don'... |
838 |
BUG_ON(cpu_online(cpu)); |
1da177e4c Linux-2.6.12-rc2 |
839 |
|
48c5ccae8 sched: Simplify c... |
840 |
/* |
ee1e714b9 cpu/hotplug: Remo... |
841 |
* The CPUHP_AP_SCHED_MIGRATE_DYING callback will have removed all |
48c5ccae8 sched: Simplify c... |
842 843 |
* 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... |
844 845 |
* * Wait for the stop thread to go away. |
48c5ccae8 sched: Simplify c... |
846 |
*/ |
5ebe7742f smp/hotplug: Diff... |
847 |
wait_for_ap_thread(st, false); |
e69aab131 cpu/hotplug: Make... |
848 |
BUG_ON(st->state != CPUHP_AP_IDLE_DEAD); |
1da177e4c Linux-2.6.12-rc2 |
849 |
|
a89941816 hotplug: Prevent ... |
850 851 |
/* Interrupts are moved away from the dying cpu, reenable alloc/free */ irq_unlock_sparse(); |
345527b1e clockevents: Fix ... |
852 |
hotplug_cpu__broadcast_tick_pull(cpu); |
1da177e4c Linux-2.6.12-rc2 |
853 854 |
/* This actually kills the CPU. */ __cpu_die(cpu); |
a49b116dc clockevents: Clea... |
855 |
tick_cleanup_dead_cpu(cpu); |
a58163d8c rcu: Migrate call... |
856 |
rcutree_migrate_callbacks(cpu); |
984581728 cpu/hotplug: Spli... |
857 858 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
859 |
|
71f87b2fc cpu/hotplug: Plug... |
860 861 862 |
static void cpuhp_complete_idle_dead(void *arg) { struct cpuhp_cpu_state *st = arg; |
5ebe7742f smp/hotplug: Diff... |
863 |
complete_ap_thread(st, false); |
71f87b2fc cpu/hotplug: Plug... |
864 |
} |
e69aab131 cpu/hotplug: Make... |
865 866 867 868 869 |
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... |
870 |
rcu_report_dead(smp_processor_id()); |
71f87b2fc cpu/hotplug: Plug... |
871 872 873 874 875 876 877 |
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... |
878 |
} |
4dddfb5fa smp/hotplug: Rewr... |
879 880 881 882 |
static void undo_cpu_down(unsigned int cpu, struct cpuhp_cpu_state *st) { for (st->state++; st->state < st->target; st->state++) { struct cpuhp_step *step = cpuhp_get_step(st->state); |
cff7d378d cpu/hotplug: Conv... |
883 |
|
4dddfb5fa smp/hotplug: Rewr... |
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 |
if (!step->skip_onerr) cpuhp_invoke_callback(cpu, st->state, true, NULL, NULL); } } static int cpuhp_down_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st, enum cpuhp_state target) { enum cpuhp_state prev_state = st->state; int ret = 0; for (; st->state > target; st->state--) { ret = cpuhp_invoke_callback(cpu, st->state, false, NULL, NULL); if (ret) { st->target = prev_state; |
1d92a611d cpu/hotplug: Prev... |
899 900 |
if (st->state < prev_state) undo_cpu_down(cpu, st); |
4dddfb5fa smp/hotplug: Rewr... |
901 902 903 904 905 |
break; } } return ret; } |
cff7d378d cpu/hotplug: Conv... |
906 |
|
984581728 cpu/hotplug: Spli... |
907 |
/* Requires cpu_add_remove_lock to be held */ |
af1f40457 cpu/hotplug: Hand... |
908 909 |
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, enum cpuhp_state target) |
984581728 cpu/hotplug: Spli... |
910 |
{ |
cff7d378d cpu/hotplug: Conv... |
911 912 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int prev_state, ret = 0; |
984581728 cpu/hotplug: Spli... |
913 914 915 |
if (num_online_cpus() == 1) return -EBUSY; |
757c989b9 cpu/hotplug: Make... |
916 |
if (!cpu_present(cpu)) |
984581728 cpu/hotplug: Spli... |
917 |
return -EINVAL; |
8f553c498 cpu/hotplug: Prov... |
918 |
cpus_write_lock(); |
984581728 cpu/hotplug: Spli... |
919 920 |
cpuhp_tasks_frozen = tasks_frozen; |
4dddfb5fa smp/hotplug: Rewr... |
921 |
prev_state = cpuhp_set_state(st, target); |
1cf4f629d cpu/hotplug: Move... |
922 923 924 925 |
/* * 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 ... |
926 |
if (st->state > CPUHP_TEARDOWN_CPU) { |
4dddfb5fa smp/hotplug: Rewr... |
927 |
st->target = max((int)target, CPUHP_TEARDOWN_CPU); |
1cf4f629d cpu/hotplug: Move... |
928 929 930 931 932 933 934 935 936 937 938 939 |
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 ... |
940 |
if (st->state > CPUHP_TEARDOWN_CPU) |
1cf4f629d cpu/hotplug: Move... |
941 |
goto out; |
4dddfb5fa smp/hotplug: Rewr... |
942 943 |
st->target = target; |
1cf4f629d cpu/hotplug: Move... |
944 945 |
} /* |
8df3e07e7 cpu/hotplug: Let ... |
946 |
* The AP brought itself down to CPUHP_TEARDOWN_CPU. So we need |
1cf4f629d cpu/hotplug: Move... |
947 948 |
* to do the further cleanups. */ |
a724632ca cpu/hotplug: Rewo... |
949 |
ret = cpuhp_down_callbacks(cpu, st, target); |
1d92a611d cpu/hotplug: Prev... |
950 |
if (ret && st->state == CPUHP_TEARDOWN_CPU && st->state < prev_state) { |
4dddfb5fa smp/hotplug: Rewr... |
951 952 |
cpuhp_reset_state(st, prev_state); __cpuhp_kick_ap(st); |
3b9d6da67 cpu/hotplug: Fix ... |
953 |
} |
984581728 cpu/hotplug: Spli... |
954 |
|
1cf4f629d cpu/hotplug: Move... |
955 |
out: |
8f553c498 cpu/hotplug: Prov... |
956 |
cpus_write_unlock(); |
941154bd6 watchdog/hardlock... |
957 958 959 960 961 |
/* * Do post unplug cleanup. This is still protected against * concurrent CPU hotplug via cpu_add_remove_lock. */ lockup_detector_cleanup(); |
36a4c5fc9 x86/speculation: ... |
962 |
arch_smt_update(); |
cff7d378d cpu/hotplug: Conv... |
963 |
return ret; |
e3920fb42 [PATCH] Disable C... |
964 |
} |
6beba29c6 cpu/hotplug: Spli... |
965 966 967 968 969 970 |
static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target) { if (cpu_hotplug_disabled) return -EBUSY; return _cpu_down(cpu, 0, target); } |
af1f40457 cpu/hotplug: Hand... |
971 |
static int do_cpu_down(unsigned int cpu, enum cpuhp_state target) |
e3920fb42 [PATCH] Disable C... |
972 |
{ |
9ea09af3b stop_machine: int... |
973 |
int err; |
e3920fb42 [PATCH] Disable C... |
974 |
|
d221938c0 cpu-hotplug: refc... |
975 |
cpu_maps_update_begin(); |
6beba29c6 cpu/hotplug: Spli... |
976 |
err = cpu_down_maps_locked(cpu, target); |
d221938c0 cpu-hotplug: refc... |
977 |
cpu_maps_update_done(); |
1da177e4c Linux-2.6.12-rc2 |
978 979 |
return err; } |
4dddfb5fa smp/hotplug: Rewr... |
980 |
|
af1f40457 cpu/hotplug: Hand... |
981 982 983 984 |
int cpu_down(unsigned int cpu) { return do_cpu_down(cpu, CPUHP_OFFLINE); } |
b62b8ef90 force offline the... |
985 |
EXPORT_SYMBOL(cpu_down); |
4dddfb5fa smp/hotplug: Rewr... |
986 987 988 |
#else #define takedown_cpu NULL |
1da177e4c Linux-2.6.12-rc2 |
989 |
#endif /*CONFIG_HOTPLUG_CPU*/ |
4baa0afc6 cpu/hotplug: Conv... |
990 |
/** |
ee1e714b9 cpu/hotplug: Remo... |
991 |
* notify_cpu_starting(cpu) - Invoke the callbacks on the starting CPU |
4baa0afc6 cpu/hotplug: Conv... |
992 993 |
* @cpu: cpu that just started * |
4baa0afc6 cpu/hotplug: Conv... |
994 995 996 997 998 999 1000 |
* 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); |
724a86881 smp/hotplug: Call... |
1001 |
int ret; |
4baa0afc6 cpu/hotplug: Conv... |
1002 |
|
0c6d4576c cpu/hotplug: Get ... |
1003 |
rcu_cpu_starting(cpu); /* Enables RCU usage on this CPU. */ |
7f2229c92 cpu/hotplug: Boot... |
1004 |
st->booted_once = true; |
4baa0afc6 cpu/hotplug: Conv... |
1005 |
while (st->state < target) { |
4baa0afc6 cpu/hotplug: Conv... |
1006 |
st->state++; |
724a86881 smp/hotplug: Call... |
1007 1008 1009 1010 1011 |
ret = cpuhp_invoke_callback(cpu, st->state, true, NULL, NULL); /* * STARTING must not fail! */ WARN_ON_ONCE(ret); |
4baa0afc6 cpu/hotplug: Conv... |
1012 1013 |
} } |
949338e35 cpu/hotplug: Move... |
1014 |
/* |
9cd4f1a4e smp/hotplug: Move... |
1015 1016 1017 |
* Called from the idle task. Wake up the controlling task which brings the * stopper and the hotplug thread of the upcoming CPU up and then delegates * the rest of the online bringup to the hotplug thread. |
949338e35 cpu/hotplug: Move... |
1018 |
*/ |
8df3e07e7 cpu/hotplug: Let ... |
1019 |
void cpuhp_online_idle(enum cpuhp_state state) |
949338e35 cpu/hotplug: Move... |
1020 |
{ |
8df3e07e7 cpu/hotplug: Let ... |
1021 |
struct cpuhp_cpu_state *st = this_cpu_ptr(&cpuhp_state); |
8df3e07e7 cpu/hotplug: Let ... |
1022 1023 1024 1025 1026 1027 |
/* Happens for the boot cpu */ if (state != CPUHP_AP_ONLINE_IDLE) return; st->state = CPUHP_AP_ONLINE_IDLE; |
5ebe7742f smp/hotplug: Diff... |
1028 |
complete_ap_thread(st, true); |
949338e35 cpu/hotplug: Move... |
1029 |
} |
e3920fb42 [PATCH] Disable C... |
1030 |
/* Requires cpu_add_remove_lock to be held */ |
af1f40457 cpu/hotplug: Hand... |
1031 |
static int _cpu_up(unsigned int cpu, int tasks_frozen, enum cpuhp_state target) |
1da177e4c Linux-2.6.12-rc2 |
1032 |
{ |
cff7d378d cpu/hotplug: Conv... |
1033 |
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); |
3bb5d2ee3 smp, idle: Alloca... |
1034 |
struct task_struct *idle; |
2e1a3483c cpu/hotplug: Spli... |
1035 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1036 |
|
8f553c498 cpu/hotplug: Prov... |
1037 |
cpus_write_lock(); |
38498a67a smp: Add generic ... |
1038 |
|
757c989b9 cpu/hotplug: Make... |
1039 |
if (!cpu_present(cpu)) { |
5e5041f35 ACPI / processor:... |
1040 1041 1042 |
ret = -EINVAL; goto out; } |
757c989b9 cpu/hotplug: Make... |
1043 1044 1045 1046 1047 |
/* * The caller of do_cpu_up might have raced with another * caller. Ignore it for now. */ if (st->state >= target) |
38498a67a smp: Add generic ... |
1048 |
goto out; |
757c989b9 cpu/hotplug: Make... |
1049 1050 1051 1052 1053 1054 1055 1056 |
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... |
1057 |
} |
38498a67a smp: Add generic ... |
1058 |
|
ba9974624 cpu/hotplug: Rest... |
1059 |
cpuhp_tasks_frozen = tasks_frozen; |
4dddfb5fa smp/hotplug: Rewr... |
1060 |
cpuhp_set_state(st, target); |
1cf4f629d cpu/hotplug: Move... |
1061 1062 1063 1064 |
/* * 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 ... |
1065 |
if (st->state > CPUHP_BRINGUP_CPU) { |
1cf4f629d cpu/hotplug: Move... |
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 |
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 ... |
1077 |
* CPUHP_BRINGUP_CPU. After that the AP hotplug thread is |
1cf4f629d cpu/hotplug: Move... |
1078 1079 |
* responsible for bringing it up to the target state. */ |
8df3e07e7 cpu/hotplug: Let ... |
1080 |
target = min((int)target, CPUHP_BRINGUP_CPU); |
a724632ca cpu/hotplug: Rewo... |
1081 |
ret = cpuhp_up_callbacks(cpu, st, target); |
38498a67a smp: Add generic ... |
1082 |
out: |
8f553c498 cpu/hotplug: Prov... |
1083 |
cpus_write_unlock(); |
36a4c5fc9 x86/speculation: ... |
1084 |
arch_smt_update(); |
e3920fb42 [PATCH] Disable C... |
1085 1086 |
return ret; } |
af1f40457 cpu/hotplug: Hand... |
1087 |
static int do_cpu_up(unsigned int cpu, enum cpuhp_state target) |
e3920fb42 [PATCH] Disable C... |
1088 1089 |
{ int err = 0; |
cf23422b9 cpu/mem hotplug: ... |
1090 |
|
e0b582ec5 cpumask: convert ... |
1091 |
if (!cpu_possible(cpu)) { |
84117da5b kernel/cpu.c: con... |
1092 1093 1094 |
pr_err("can't online cpu %d because it is not configured as may-hotadd at boot time ", cpu); |
87d5e0236 kernel/cpu.c: del... |
1095 |
#if defined(CONFIG_IA64) |
84117da5b kernel/cpu.c: con... |
1096 1097 |
pr_err("please check additional_cpus= boot parameter "); |
73e753a50 CPU HOTPLUG: avoi... |
1098 1099 1100 |
#endif return -EINVAL; } |
e3920fb42 [PATCH] Disable C... |
1101 |
|
01b0f1970 cpu/mem hotplug: ... |
1102 1103 1104 |
err = try_online_node(cpu_to_node(cpu)); if (err) return err; |
cf23422b9 cpu/mem hotplug: ... |
1105 |
|
d221938c0 cpu-hotplug: refc... |
1106 |
cpu_maps_update_begin(); |
e761b7725 cpu hotplug, sche... |
1107 1108 |
if (cpu_hotplug_disabled) { |
e3920fb42 [PATCH] Disable C... |
1109 |
err = -EBUSY; |
e761b7725 cpu hotplug, sche... |
1110 1111 |
goto out; } |
c5ac43ee8 cpu/hotplug: Prov... |
1112 1113 1114 1115 |
if (!cpu_smt_allowed(cpu)) { err = -EPERM; goto out; } |
e761b7725 cpu hotplug, sche... |
1116 |
|
af1f40457 cpu/hotplug: Hand... |
1117 |
err = _cpu_up(cpu, 0, target); |
e761b7725 cpu hotplug, sche... |
1118 |
out: |
d221938c0 cpu-hotplug: refc... |
1119 |
cpu_maps_update_done(); |
e3920fb42 [PATCH] Disable C... |
1120 1121 |
return err; } |
af1f40457 cpu/hotplug: Hand... |
1122 1123 1124 1125 1126 |
int cpu_up(unsigned int cpu) { return do_cpu_up(cpu, CPUHP_ONLINE); } |
a513f6bab cpu: Export cpu_up() |
1127 |
EXPORT_SYMBOL_GPL(cpu_up); |
e3920fb42 [PATCH] Disable C... |
1128 |
|
f3de4be9d PM: Fix dependenc... |
1129 |
#ifdef CONFIG_PM_SLEEP_SMP |
e0b582ec5 cpumask: convert ... |
1130 |
static cpumask_var_t frozen_cpus; |
e3920fb42 [PATCH] Disable C... |
1131 |
|
d391e5522 cpu/hotplug: Allo... |
1132 |
int freeze_secondary_cpus(int primary) |
e3920fb42 [PATCH] Disable C... |
1133 |
{ |
d391e5522 cpu/hotplug: Allo... |
1134 |
int cpu, error = 0; |
e3920fb42 [PATCH] Disable C... |
1135 |
|
d221938c0 cpu-hotplug: refc... |
1136 |
cpu_maps_update_begin(); |
d391e5522 cpu/hotplug: Allo... |
1137 1138 |
if (!cpu_online(primary)) primary = cpumask_first(cpu_online_mask); |
9ee349ad6 sched: Fix set_cp... |
1139 1140 |
/* * We take down all of the non-boot CPUs in one shot to avoid races |
e3920fb42 [PATCH] Disable C... |
1141 1142 |
* with the userspace trying to use the CPU hotplug at the same time */ |
e0b582ec5 cpumask: convert ... |
1143 |
cpumask_clear(frozen_cpus); |
6ad4c1888 sched: Fix balanc... |
1144 |
|
84117da5b kernel/cpu.c: con... |
1145 1146 |
pr_info("Disabling non-boot CPUs ... "); |
e3920fb42 [PATCH] Disable C... |
1147 |
for_each_online_cpu(cpu) { |
d391e5522 cpu/hotplug: Allo... |
1148 |
if (cpu == primary) |
e3920fb42 [PATCH] Disable C... |
1149 |
continue; |
bb3632c61 PM / sleep: trace... |
1150 |
trace_suspend_resume(TPS("CPU_OFF"), cpu, true); |
af1f40457 cpu/hotplug: Hand... |
1151 |
error = _cpu_down(cpu, 1, CPUHP_OFFLINE); |
bb3632c61 PM / sleep: trace... |
1152 |
trace_suspend_resume(TPS("CPU_OFF"), cpu, false); |
feae3203d timers, init: Lim... |
1153 |
if (!error) |
e0b582ec5 cpumask: convert ... |
1154 |
cpumask_set_cpu(cpu, frozen_cpus); |
feae3203d timers, init: Lim... |
1155 |
else { |
84117da5b kernel/cpu.c: con... |
1156 1157 |
pr_err("Error taking CPU%d down: %d ", cpu, error); |
e3920fb42 [PATCH] Disable C... |
1158 1159 1160 |
break; } } |
86886e55b x86, intel_txt: I... |
1161 |
|
89af7ba57 cpu-hotplug: conv... |
1162 |
if (!error) |
e3920fb42 [PATCH] Disable C... |
1163 |
BUG_ON(num_online_cpus() > 1); |
89af7ba57 cpu-hotplug: conv... |
1164 |
else |
84117da5b kernel/cpu.c: con... |
1165 1166 |
pr_err("Non-boot CPUs are not disabled "); |
89af7ba57 cpu-hotplug: conv... |
1167 1168 1169 1170 1171 1172 1173 |
/* * 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... |
1174 |
cpu_maps_update_done(); |
e3920fb42 [PATCH] Disable C... |
1175 1176 |
return error; } |
d0af9eed5 x86, pat/mtrr: Re... |
1177 1178 1179 1180 1181 1182 1183 |
void __weak arch_enable_nonboot_cpus_begin(void) { } void __weak arch_enable_nonboot_cpus_end(void) { } |
71cf5aeeb kernel, cpu: Remo... |
1184 |
void enable_nonboot_cpus(void) |
e3920fb42 [PATCH] Disable C... |
1185 1186 1187 1188 |
{ int cpu, error; /* Allow everyone to use the CPU hotplug again */ |
d221938c0 cpu-hotplug: refc... |
1189 |
cpu_maps_update_begin(); |
01b411590 cpu/hotplug: Hand... |
1190 |
__cpu_hotplug_enable(); |
e0b582ec5 cpumask: convert ... |
1191 |
if (cpumask_empty(frozen_cpus)) |
1d64b9cb1 [PATCH] Fix micro... |
1192 |
goto out; |
e3920fb42 [PATCH] Disable C... |
1193 |
|
84117da5b kernel/cpu.c: con... |
1194 1195 |
pr_info("Enabling non-boot CPUs ... "); |
d0af9eed5 x86, pat/mtrr: Re... |
1196 1197 |
arch_enable_nonboot_cpus_begin(); |
e0b582ec5 cpumask: convert ... |
1198 |
for_each_cpu(cpu, frozen_cpus) { |
bb3632c61 PM / sleep: trace... |
1199 |
trace_suspend_resume(TPS("CPU_ON"), cpu, true); |
af1f40457 cpu/hotplug: Hand... |
1200 |
error = _cpu_up(cpu, 1, CPUHP_ONLINE); |
bb3632c61 PM / sleep: trace... |
1201 |
trace_suspend_resume(TPS("CPU_ON"), cpu, false); |
e3920fb42 [PATCH] Disable C... |
1202 |
if (!error) { |
84117da5b kernel/cpu.c: con... |
1203 1204 |
pr_info("CPU%d is up ", cpu); |
e3920fb42 [PATCH] Disable C... |
1205 1206 |
continue; } |
84117da5b kernel/cpu.c: con... |
1207 1208 |
pr_warn("Error taking CPU%d up: %d ", cpu, error); |
e3920fb42 [PATCH] Disable C... |
1209 |
} |
d0af9eed5 x86, pat/mtrr: Re... |
1210 1211 |
arch_enable_nonboot_cpus_end(); |
e0b582ec5 cpumask: convert ... |
1212 |
cpumask_clear(frozen_cpus); |
1d64b9cb1 [PATCH] Fix micro... |
1213 |
out: |
d221938c0 cpu-hotplug: refc... |
1214 |
cpu_maps_update_done(); |
1da177e4c Linux-2.6.12-rc2 |
1215 |
} |
e0b582ec5 cpumask: convert ... |
1216 |
|
d7268a31c CPU: Add right qu... |
1217 |
static int __init alloc_frozen_cpus(void) |
e0b582ec5 cpumask: convert ... |
1218 1219 1220 1221 1222 1223 |
{ if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) return -ENOMEM; return 0; } core_initcall(alloc_frozen_cpus); |
79cfbdfa8 PM / Sleep: Fix r... |
1224 1225 |
/* |
79cfbdfa8 PM / Sleep: Fix r... |
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 |
* 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... |
1244 |
cpu_hotplug_disable(); |
79cfbdfa8 PM / Sleep: Fix r... |
1245 1246 1247 1248 |
break; case PM_POST_SUSPEND: case PM_POST_HIBERNATION: |
16e53dbf1 CPU hotplug: prov... |
1249 |
cpu_hotplug_enable(); |
79cfbdfa8 PM / Sleep: Fix r... |
1250 1251 1252 1253 1254 1255 1256 1257 |
break; default: return NOTIFY_DONE; } return NOTIFY_OK; } |
d7268a31c CPU: Add right qu... |
1258 |
static int __init cpu_hotplug_pm_sync_init(void) |
79cfbdfa8 PM / Sleep: Fix r... |
1259 |
{ |
6e32d479d kernel/cpu.c: Add... |
1260 1261 1262 1263 1264 |
/* * 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... |
1265 1266 1267 1268 |
pm_notifier(cpu_hotplug_pm_callback, 0); return 0; } core_initcall(cpu_hotplug_pm_sync_init); |
f3de4be9d PM: Fix dependenc... |
1269 |
#endif /* CONFIG_PM_SLEEP_SMP */ |
68f4f1ec0 sched: Move cpu m... |
1270 |
|
8ce371f98 lockdep: Fix per-... |
1271 |
int __boot_cpu_id; |
68f4f1ec0 sched: Move cpu m... |
1272 |
#endif /* CONFIG_SMP */ |
b8d317d10 cpumask: make cpu... |
1273 |
|
cff7d378d cpu/hotplug: Conv... |
1274 1275 1276 1277 |
/* Boot processor state steps */ static struct cpuhp_step cpuhp_bp_states[] = { [CPUHP_OFFLINE] = { .name = "offline", |
3c1627e99 cpu/hotplug: Repl... |
1278 1279 |
.startup.single = NULL, .teardown.single = NULL, |
cff7d378d cpu/hotplug: Conv... |
1280 1281 1282 |
}, #ifdef CONFIG_SMP [CPUHP_CREATE_THREADS]= { |
677f66465 cpu/hotplug: Make... |
1283 |
.name = "threads:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1284 1285 |
.startup.single = smpboot_create_threads, .teardown.single = NULL, |
757c989b9 cpu/hotplug: Make... |
1286 |
.cant_stop = true, |
cff7d378d cpu/hotplug: Conv... |
1287 |
}, |
00e16c3d6 perf/core: Conver... |
1288 |
[CPUHP_PERF_PREPARE] = { |
3c1627e99 cpu/hotplug: Repl... |
1289 1290 1291 |
.name = "perf:prepare", .startup.single = perf_event_init_cpu, .teardown.single = perf_event_exit_cpu, |
00e16c3d6 perf/core: Conver... |
1292 |
}, |
7ee681b25 workqueue: Conver... |
1293 |
[CPUHP_WORKQUEUE_PREP] = { |
3c1627e99 cpu/hotplug: Repl... |
1294 1295 1296 |
.name = "workqueue:prepare", .startup.single = workqueue_prepare_cpu, .teardown.single = NULL, |
7ee681b25 workqueue: Conver... |
1297 |
}, |
27590dc17 hrtimer: Convert ... |
1298 |
[CPUHP_HRTIMERS_PREPARE] = { |
3c1627e99 cpu/hotplug: Repl... |
1299 1300 1301 |
.name = "hrtimers:prepare", .startup.single = hrtimers_prepare_cpu, .teardown.single = hrtimers_dead_cpu, |
27590dc17 hrtimer: Convert ... |
1302 |
}, |
31487f832 smp/cfd: Convert ... |
1303 |
[CPUHP_SMPCFD_PREPARE] = { |
677f66465 cpu/hotplug: Make... |
1304 |
.name = "smpcfd:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1305 1306 |
.startup.single = smpcfd_prepare_cpu, .teardown.single = smpcfd_dead_cpu, |
31487f832 smp/cfd: Convert ... |
1307 |
}, |
e6d4989a9 relayfs: Convert ... |
1308 1309 1310 1311 1312 |
[CPUHP_RELAY_PREPARE] = { .name = "relay:prepare", .startup.single = relay_prepare_cpu, .teardown.single = NULL, }, |
6731d4f12 slab: Convert to ... |
1313 1314 1315 1316 |
[CPUHP_SLAB_PREPARE] = { .name = "slab:prepare", .startup.single = slab_prepare_cpu, .teardown.single = slab_dead_cpu, |
31487f832 smp/cfd: Convert ... |
1317 |
}, |
4df837425 rcu: Convert rcut... |
1318 |
[CPUHP_RCUTREE_PREP] = { |
677f66465 cpu/hotplug: Make... |
1319 |
.name = "RCU/tree:prepare", |
3c1627e99 cpu/hotplug: Repl... |
1320 1321 |
.startup.single = rcutree_prepare_cpu, .teardown.single = rcutree_dead_cpu, |
4df837425 rcu: Convert rcut... |
1322 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1323 |
/* |
4fae16dff timers/core: Corr... |
1324 1325 1326 1327 |
* 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. */ |
6fae6de72 timers: Reinitial... |
1328 |
[CPUHP_TIMERS_PREPARE] = { |
3c1627e99 cpu/hotplug: Repl... |
1329 |
.name = "timers:dead", |
6fae6de72 timers: Reinitial... |
1330 |
.startup.single = timers_prepare_cpu, |
3c1627e99 cpu/hotplug: Repl... |
1331 |
.teardown.single = timers_dead_cpu, |
4fae16dff timers/core: Corr... |
1332 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1333 |
/* Kicks the plugged cpu into life */ |
cff7d378d cpu/hotplug: Conv... |
1334 1335 |
[CPUHP_BRINGUP_CPU] = { .name = "cpu:bringup", |
3c1627e99 cpu/hotplug: Repl... |
1336 1337 |
.startup.single = bringup_cpu, .teardown.single = NULL, |
757c989b9 cpu/hotplug: Make... |
1338 |
.cant_stop = true, |
4baa0afc6 cpu/hotplug: Conv... |
1339 |
}, |
d10ef6f93 cpu/hotplug: Docu... |
1340 1341 1342 1343 |
/* * Handled on controll processor until the plugged processor manages * this itself. */ |
4baa0afc6 cpu/hotplug: Conv... |
1344 1345 |
[CPUHP_TEARDOWN_CPU] = { .name = "cpu:teardown", |
3c1627e99 cpu/hotplug: Repl... |
1346 1347 |
.startup.single = NULL, .teardown.single = takedown_cpu, |
757c989b9 cpu/hotplug: Make... |
1348 |
.cant_stop = true, |
cff7d378d cpu/hotplug: Conv... |
1349 |
}, |
a7c734140 cpu/hotplug: Keep... |
1350 1351 |
#else [CPUHP_BRINGUP_CPU] = { }, |
cff7d378d cpu/hotplug: Conv... |
1352 |
#endif |
cff7d378d cpu/hotplug: Conv... |
1353 |
}; |
4baa0afc6 cpu/hotplug: Conv... |
1354 1355 1356 |
/* Application processor state steps */ static struct cpuhp_step cpuhp_ap_states[] = { #ifdef CONFIG_SMP |
d10ef6f93 cpu/hotplug: Docu... |
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 |
/* 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... |
1369 1370 1371 |
/* First state is scheduler control. Interrupts are disabled */ [CPUHP_AP_SCHED_STARTING] = { .name = "sched:starting", |
3c1627e99 cpu/hotplug: Repl... |
1372 1373 |
.startup.single = sched_cpu_starting, .teardown.single = sched_cpu_dying, |
9cf7243d5 sched: Make set_c... |
1374 |
}, |
4df837425 rcu: Convert rcut... |
1375 |
[CPUHP_AP_RCUTREE_DYING] = { |
677f66465 cpu/hotplug: Make... |
1376 |
.name = "RCU/tree:dying", |
3c1627e99 cpu/hotplug: Repl... |
1377 1378 |
.startup.single = NULL, .teardown.single = rcutree_dying_cpu, |
4baa0afc6 cpu/hotplug: Conv... |
1379 |
}, |
b68df97ec smp/hotplug: Move... |
1380 1381 1382 1383 1384 |
[CPUHP_AP_SMPCFD_DYING] = { .name = "smpcfd:dying", .startup.single = NULL, .teardown.single = smpcfd_dying_cpu, }, |
d10ef6f93 cpu/hotplug: Docu... |
1385 1386 1387 1388 1389 1390 |
/* 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... |
1391 |
[CPUHP_AP_SMPBOOT_THREADS] = { |
677f66465 cpu/hotplug: Make... |
1392 |
.name = "smpboot/threads:online", |
3c1627e99 cpu/hotplug: Repl... |
1393 |
.startup.single = smpboot_unpark_threads, |
26a6dcc71 cpu/hotplug: Make... |
1394 |
.teardown.single = smpboot_park_threads, |
1cf4f629d cpu/hotplug: Move... |
1395 |
}, |
c5cb83bb3 genirq/cpuhotplug... |
1396 1397 1398 1399 1400 |
[CPUHP_AP_IRQ_AFFINITY_ONLINE] = { .name = "irq/affinity:online", .startup.single = irq_affinity_online_cpu, .teardown.single = NULL, }, |
00e16c3d6 perf/core: Conver... |
1401 |
[CPUHP_AP_PERF_ONLINE] = { |
3c1627e99 cpu/hotplug: Repl... |
1402 1403 1404 |
.name = "perf:online", .startup.single = perf_event_init_cpu, .teardown.single = perf_event_exit_cpu, |
00e16c3d6 perf/core: Conver... |
1405 |
}, |
7ee681b25 workqueue: Conver... |
1406 |
[CPUHP_AP_WORKQUEUE_ONLINE] = { |
3c1627e99 cpu/hotplug: Repl... |
1407 1408 1409 |
.name = "workqueue:online", .startup.single = workqueue_online_cpu, .teardown.single = workqueue_offline_cpu, |
7ee681b25 workqueue: Conver... |
1410 |
}, |
4df837425 rcu: Convert rcut... |
1411 |
[CPUHP_AP_RCUTREE_ONLINE] = { |
677f66465 cpu/hotplug: Make... |
1412 |
.name = "RCU/tree:online", |
3c1627e99 cpu/hotplug: Repl... |
1413 1414 |
.startup.single = rcutree_online_cpu, .teardown.single = rcutree_offline_cpu, |
4df837425 rcu: Convert rcut... |
1415 |
}, |
4baa0afc6 cpu/hotplug: Conv... |
1416 |
#endif |
d10ef6f93 cpu/hotplug: Docu... |
1417 1418 1419 |
/* * The dynamically registered state space is here */ |
aaddd7d1c sched/hotplug: Ma... |
1420 1421 1422 1423 |
#ifdef CONFIG_SMP /* Last state is scheduler control setting the cpu active */ [CPUHP_AP_ACTIVE] = { .name = "sched:active", |
3c1627e99 cpu/hotplug: Repl... |
1424 1425 |
.startup.single = sched_cpu_activate, .teardown.single = sched_cpu_deactivate, |
aaddd7d1c sched/hotplug: Ma... |
1426 1427 |
}, #endif |
d10ef6f93 cpu/hotplug: Docu... |
1428 |
/* CPU is fully up and running. */ |
4baa0afc6 cpu/hotplug: Conv... |
1429 1430 |
[CPUHP_ONLINE] = { .name = "online", |
3c1627e99 cpu/hotplug: Repl... |
1431 1432 |
.startup.single = NULL, .teardown.single = NULL, |
4baa0afc6 cpu/hotplug: Conv... |
1433 1434 |
}, }; |
5b7aa87e0 cpu/hotplug: Impl... |
1435 1436 1437 1438 1439 1440 1441 |
/* Sanity check for callbacks */ static int cpuhp_cb_check(enum cpuhp_state state) { if (state <= CPUHP_OFFLINE || state >= CPUHP_ONLINE) return -EINVAL; return 0; } |
dc280d936 cpu/hotplug: Prev... |
1442 1443 1444 1445 1446 1447 1448 |
/* * 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) { |
4205e4786 cpu/hotplug: Prov... |
1449 1450 |
enum cpuhp_state i, end; struct cpuhp_step *step; |
dc280d936 cpu/hotplug: Prev... |
1451 |
|
4205e4786 cpu/hotplug: Prov... |
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
switch (state) { case CPUHP_AP_ONLINE_DYN: step = cpuhp_ap_states + CPUHP_AP_ONLINE_DYN; end = CPUHP_AP_ONLINE_DYN_END; break; case CPUHP_BP_PREPARE_DYN: step = cpuhp_bp_states + CPUHP_BP_PREPARE_DYN; end = CPUHP_BP_PREPARE_DYN_END; break; default: return -EINVAL; } for (i = state; i <= end; i++, step++) { if (!step->name) |
dc280d936 cpu/hotplug: Prev... |
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 |
return i; } WARN(1, "No more dynamic states available for CPU hotplug "); return -ENOSPC; } static int cpuhp_store_callbacks(enum cpuhp_state state, const char *name, int (*startup)(unsigned int cpu), int (*teardown)(unsigned int cpu), bool multi_instance) |
5b7aa87e0 cpu/hotplug: Impl... |
1478 1479 1480 |
{ /* (Un)Install the callbacks for further cpu hotplug operations */ struct cpuhp_step *sp; |
dc280d936 cpu/hotplug: Prev... |
1481 |
int ret = 0; |
5b7aa87e0 cpu/hotplug: Impl... |
1482 |
|
0c96b2730 smp/hotplug: Hand... |
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 |
/* * If name is NULL, then the state gets removed. * * CPUHP_AP_ONLINE_DYN and CPUHP_BP_PREPARE_DYN are handed out on * the first allocation from these dynamic ranges, so the removal * would trigger a new allocation and clear the wrong (already * empty) state, leaving the callbacks of the to be cleared state * dangling, which causes wreckage on the next hotplug operation. */ if (name && (state == CPUHP_AP_ONLINE_DYN || state == CPUHP_BP_PREPARE_DYN)) { |
dc280d936 cpu/hotplug: Prev... |
1494 1495 |
ret = cpuhp_reserve_state(state); if (ret < 0) |
dc434e056 cpu/hotplug: Seri... |
1496 |
return ret; |
dc280d936 cpu/hotplug: Prev... |
1497 1498 |
state = ret; } |
5b7aa87e0 cpu/hotplug: Impl... |
1499 |
sp = cpuhp_get_step(state); |
dc434e056 cpu/hotplug: Seri... |
1500 1501 |
if (name && sp->name) return -EBUSY; |
3c1627e99 cpu/hotplug: Repl... |
1502 1503 |
sp->startup.single = startup; sp->teardown.single = teardown; |
5b7aa87e0 cpu/hotplug: Impl... |
1504 |
sp->name = name; |
cf392d10b cpu/hotplug: Add ... |
1505 1506 |
sp->multi_instance = multi_instance; INIT_HLIST_HEAD(&sp->list); |
dc280d936 cpu/hotplug: Prev... |
1507 |
return ret; |
5b7aa87e0 cpu/hotplug: Impl... |
1508 1509 1510 1511 |
} static void *cpuhp_get_teardown_cb(enum cpuhp_state state) { |
3c1627e99 cpu/hotplug: Repl... |
1512 |
return cpuhp_get_step(state)->teardown.single; |
5b7aa87e0 cpu/hotplug: Impl... |
1513 |
} |
5b7aa87e0 cpu/hotplug: Impl... |
1514 1515 1516 1517 |
/* * Call the startup/teardown function for a step either on the AP or * on the current CPU. */ |
cf392d10b cpu/hotplug: Add ... |
1518 1519 |
static int cpuhp_issue_call(int cpu, enum cpuhp_state state, bool bringup, struct hlist_node *node) |
5b7aa87e0 cpu/hotplug: Impl... |
1520 |
{ |
a724632ca cpu/hotplug: Rewo... |
1521 |
struct cpuhp_step *sp = cpuhp_get_step(state); |
5b7aa87e0 cpu/hotplug: Impl... |
1522 |
int ret; |
4dddfb5fa smp/hotplug: Rewr... |
1523 1524 1525 1526 |
/* * If there's nothing to do, we done. * Relies on the union for multi_instance. */ |
3c1627e99 cpu/hotplug: Repl... |
1527 1528 |
if ((bringup && !sp->startup.single) || (!bringup && !sp->teardown.single)) |
5b7aa87e0 cpu/hotplug: Impl... |
1529 |
return 0; |
5b7aa87e0 cpu/hotplug: Impl... |
1530 1531 1532 1533 |
/* * The non AP bound callbacks can fail on bringup. On teardown * e.g. module removal we crash for now. */ |
1cf4f629d cpu/hotplug: Move... |
1534 1535 |
#ifdef CONFIG_SMP if (cpuhp_is_ap_state(state)) |
cf392d10b cpu/hotplug: Add ... |
1536 |
ret = cpuhp_invoke_ap_callback(cpu, state, bringup, node); |
1cf4f629d cpu/hotplug: Move... |
1537 |
else |
96abb9685 smp/hotplug: Allo... |
1538 |
ret = cpuhp_invoke_callback(cpu, state, bringup, node, NULL); |
1cf4f629d cpu/hotplug: Move... |
1539 |
#else |
96abb9685 smp/hotplug: Allo... |
1540 |
ret = cpuhp_invoke_callback(cpu, state, bringup, node, NULL); |
1cf4f629d cpu/hotplug: Move... |
1541 |
#endif |
5b7aa87e0 cpu/hotplug: Impl... |
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 |
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 ... |
1552 |
struct hlist_node *node) |
5b7aa87e0 cpu/hotplug: Impl... |
1553 1554 |
{ int cpu; |
5b7aa87e0 cpu/hotplug: Impl... |
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 |
/* 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 ... |
1565 |
cpuhp_issue_call(cpu, state, false, node); |
5b7aa87e0 cpu/hotplug: Impl... |
1566 1567 |
} } |
9805c6733 cpu/hotplug: Add ... |
1568 1569 1570 |
int __cpuhp_state_add_instance_cpuslocked(enum cpuhp_state state, struct hlist_node *node, bool invoke) |
cf392d10b cpu/hotplug: Add ... |
1571 1572 1573 1574 |
{ struct cpuhp_step *sp; int cpu; int ret; |
9805c6733 cpu/hotplug: Add ... |
1575 |
lockdep_assert_cpus_held(); |
cf392d10b cpu/hotplug: Add ... |
1576 1577 1578 |
sp = cpuhp_get_step(state); if (sp->multi_instance == false) return -EINVAL; |
dc434e056 cpu/hotplug: Seri... |
1579 |
mutex_lock(&cpuhp_state_mutex); |
cf392d10b cpu/hotplug: Add ... |
1580 |
|
3c1627e99 cpu/hotplug: Repl... |
1581 |
if (!invoke || !sp->startup.multi) |
cf392d10b cpu/hotplug: Add ... |
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 |
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... |
1597 |
if (sp->teardown.multi) |
cf392d10b cpu/hotplug: Add ... |
1598 |
cpuhp_rollback_install(cpu, state, node); |
dc434e056 cpu/hotplug: Seri... |
1599 |
goto unlock; |
cf392d10b cpu/hotplug: Add ... |
1600 1601 1602 1603 |
} } add_node: ret = 0; |
cf392d10b cpu/hotplug: Add ... |
1604 |
hlist_add_head(node, &sp->list); |
dc434e056 cpu/hotplug: Seri... |
1605 |
unlock: |
cf392d10b cpu/hotplug: Add ... |
1606 |
mutex_unlock(&cpuhp_state_mutex); |
9805c6733 cpu/hotplug: Add ... |
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 |
return ret; } int __cpuhp_state_add_instance(enum cpuhp_state state, struct hlist_node *node, bool invoke) { int ret; cpus_read_lock(); ret = __cpuhp_state_add_instance_cpuslocked(state, node, invoke); |
8f553c498 cpu/hotplug: Prov... |
1617 |
cpus_read_unlock(); |
cf392d10b cpu/hotplug: Add ... |
1618 1619 1620 |
return ret; } EXPORT_SYMBOL_GPL(__cpuhp_state_add_instance); |
5b7aa87e0 cpu/hotplug: Impl... |
1621 |
/** |
71def423f cpu/hotplug: Prov... |
1622 |
* __cpuhp_setup_state_cpuslocked - Setup the callbacks for an hotplug machine state |
dc280d936 cpu/hotplug: Prev... |
1623 1624 1625 1626 1627 1628 1629 |
* @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 * @multi_instance: State is set up for multiple instances which get * added afterwards. |
5b7aa87e0 cpu/hotplug: Impl... |
1630 |
* |
71def423f cpu/hotplug: Prov... |
1631 |
* The caller needs to hold cpus read locked while calling this function. |
512f09801 cpu/hotplug: Clar... |
1632 1633 1634 1635 1636 |
* Returns: * On success: * Positive state number if @state is CPUHP_AP_ONLINE_DYN * 0 for all other states * On failure: proper (negative) error code |
5b7aa87e0 cpu/hotplug: Impl... |
1637 |
*/ |
71def423f cpu/hotplug: Prov... |
1638 1639 1640 1641 1642 |
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) |
5b7aa87e0 cpu/hotplug: Impl... |
1643 1644 |
{ int cpu, ret = 0; |
b9d9d6911 smp/hotplug: Undo... |
1645 |
bool dynstate; |
5b7aa87e0 cpu/hotplug: Impl... |
1646 |
|
71def423f cpu/hotplug: Prov... |
1647 |
lockdep_assert_cpus_held(); |
5b7aa87e0 cpu/hotplug: Impl... |
1648 1649 |
if (cpuhp_cb_check(state) || !name) return -EINVAL; |
dc434e056 cpu/hotplug: Seri... |
1650 |
mutex_lock(&cpuhp_state_mutex); |
5b7aa87e0 cpu/hotplug: Impl... |
1651 |
|
dc280d936 cpu/hotplug: Prev... |
1652 1653 |
ret = cpuhp_store_callbacks(state, name, startup, teardown, multi_instance); |
5b7aa87e0 cpu/hotplug: Impl... |
1654 |
|
b9d9d6911 smp/hotplug: Undo... |
1655 1656 1657 1658 1659 |
dynstate = state == CPUHP_AP_ONLINE_DYN; if (ret > 0 && dynstate) { state = ret; ret = 0; } |
dc280d936 cpu/hotplug: Prev... |
1660 |
if (ret || !invoke || !startup) |
5b7aa87e0 cpu/hotplug: Impl... |
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 |
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 ... |
1673 |
ret = cpuhp_issue_call(cpu, state, true, NULL); |
5b7aa87e0 cpu/hotplug: Impl... |
1674 |
if (ret) { |
a724632ca cpu/hotplug: Rewo... |
1675 |
if (teardown) |
cf392d10b cpu/hotplug: Add ... |
1676 1677 |
cpuhp_rollback_install(cpu, state, NULL); cpuhp_store_callbacks(state, NULL, NULL, NULL, false); |
5b7aa87e0 cpu/hotplug: Impl... |
1678 1679 1680 1681 |
goto out; } } out: |
dc434e056 cpu/hotplug: Seri... |
1682 |
mutex_unlock(&cpuhp_state_mutex); |
dc280d936 cpu/hotplug: Prev... |
1683 1684 1685 1686 |
/* * If the requested state is CPUHP_AP_ONLINE_DYN, return the * dynamically allocated state in case of success. */ |
b9d9d6911 smp/hotplug: Undo... |
1687 |
if (!ret && dynstate) |
5b7aa87e0 cpu/hotplug: Impl... |
1688 1689 1690 |
return state; return ret; } |
71def423f cpu/hotplug: Prov... |
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 |
EXPORT_SYMBOL(__cpuhp_setup_state_cpuslocked); 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 ret; cpus_read_lock(); ret = __cpuhp_setup_state_cpuslocked(state, name, invoke, startup, teardown, multi_instance); cpus_read_unlock(); return ret; } |
5b7aa87e0 cpu/hotplug: Impl... |
1707 |
EXPORT_SYMBOL(__cpuhp_setup_state); |
cf392d10b cpu/hotplug: Add ... |
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 |
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; |
8f553c498 cpu/hotplug: Prov... |
1718 |
cpus_read_lock(); |
dc434e056 cpu/hotplug: Seri... |
1719 |
mutex_lock(&cpuhp_state_mutex); |
cf392d10b cpu/hotplug: Add ... |
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 |
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: |
cf392d10b cpu/hotplug: Add ... |
1736 1737 |
hlist_del(node); mutex_unlock(&cpuhp_state_mutex); |
8f553c498 cpu/hotplug: Prov... |
1738 |
cpus_read_unlock(); |
cf392d10b cpu/hotplug: Add ... |
1739 1740 1741 1742 |
return 0; } EXPORT_SYMBOL_GPL(__cpuhp_state_remove_instance); |
dc434e056 cpu/hotplug: Seri... |
1743 |
|
5b7aa87e0 cpu/hotplug: Impl... |
1744 |
/** |
71def423f cpu/hotplug: Prov... |
1745 |
* __cpuhp_remove_state_cpuslocked - Remove the callbacks for an hotplug machine state |
5b7aa87e0 cpu/hotplug: Impl... |
1746 1747 1748 1749 |
* @state: The state to remove * @invoke: If true, the teardown function is invoked for cpus where * cpu state >= @state * |
71def423f cpu/hotplug: Prov... |
1750 |
* The caller needs to hold cpus read locked while calling this function. |
5b7aa87e0 cpu/hotplug: Impl... |
1751 1752 1753 |
* The teardown callback is currently not allowed to fail. Think * about module removal! */ |
71def423f cpu/hotplug: Prov... |
1754 |
void __cpuhp_remove_state_cpuslocked(enum cpuhp_state state, bool invoke) |
5b7aa87e0 cpu/hotplug: Impl... |
1755 |
{ |
cf392d10b cpu/hotplug: Add ... |
1756 |
struct cpuhp_step *sp = cpuhp_get_step(state); |
5b7aa87e0 cpu/hotplug: Impl... |
1757 1758 1759 |
int cpu; BUG_ON(cpuhp_cb_check(state)); |
71def423f cpu/hotplug: Prov... |
1760 |
lockdep_assert_cpus_held(); |
5b7aa87e0 cpu/hotplug: Impl... |
1761 |
|
dc434e056 cpu/hotplug: Seri... |
1762 |
mutex_lock(&cpuhp_state_mutex); |
cf392d10b cpu/hotplug: Add ... |
1763 1764 1765 1766 1767 1768 1769 |
if (sp->multi_instance) { WARN(!hlist_empty(&sp->list), "Error: Removing state %d which has instances left. ", state); goto remove; } |
a724632ca cpu/hotplug: Rewo... |
1770 |
if (!invoke || !cpuhp_get_teardown_cb(state)) |
5b7aa87e0 cpu/hotplug: Impl... |
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 |
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 ... |
1783 |
cpuhp_issue_call(cpu, state, false, NULL); |
5b7aa87e0 cpu/hotplug: Impl... |
1784 1785 |
} remove: |
cf392d10b cpu/hotplug: Add ... |
1786 |
cpuhp_store_callbacks(state, NULL, NULL, NULL, false); |
dc434e056 cpu/hotplug: Seri... |
1787 |
mutex_unlock(&cpuhp_state_mutex); |
71def423f cpu/hotplug: Prov... |
1788 1789 1790 1791 1792 1793 1794 |
} EXPORT_SYMBOL(__cpuhp_remove_state_cpuslocked); void __cpuhp_remove_state(enum cpuhp_state state, bool invoke) { cpus_read_lock(); __cpuhp_remove_state_cpuslocked(state, invoke); |
8f553c498 cpu/hotplug: Prov... |
1795 |
cpus_read_unlock(); |
5b7aa87e0 cpu/hotplug: Impl... |
1796 1797 |
} EXPORT_SYMBOL(__cpuhp_remove_state); |
98f8cdce1 cpu/hotplug: Add ... |
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 |
#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... |
1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 |
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) |
40da1b11f cpu/hotplug: Drop... |
1837 |
goto out; |
757c989b9 cpu/hotplug: Make... |
1838 1839 1840 1841 1842 |
if (st->state < target) ret = do_cpu_up(dev->id, target); else ret = do_cpu_down(dev->id, target); |
40da1b11f cpu/hotplug: Drop... |
1843 |
out: |
757c989b9 cpu/hotplug: Make... |
1844 1845 1846 |
unlock_device_hotplug(); return ret ? ret : count; } |
98f8cdce1 cpu/hotplug: Add ... |
1847 1848 1849 1850 1851 1852 1853 1854 |
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... |
1855 |
static DEVICE_ATTR(target, 0644, show_cpuhp_target, write_cpuhp_target); |
98f8cdce1 cpu/hotplug: Add ... |
1856 |
|
1db49484f smp/hotplug: Hotp... |
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 |
static ssize_t write_cpuhp_fail(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 fail, ret; ret = kstrtoint(buf, 10, &fail); if (ret) return ret; /* * Cannot fail STARTING/DYING callbacks. */ if (cpuhp_is_atomic_state(fail)) return -EINVAL; /* * Cannot fail anything that doesn't have callbacks. */ mutex_lock(&cpuhp_state_mutex); sp = cpuhp_get_step(fail); if (!sp->startup.single && !sp->teardown.single) ret = -EINVAL; mutex_unlock(&cpuhp_state_mutex); if (ret) return ret; st->fail = fail; return count; } static ssize_t show_cpuhp_fail(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->fail); } static DEVICE_ATTR(fail, 0644, show_cpuhp_fail, write_cpuhp_fail); |
98f8cdce1 cpu/hotplug: Add ... |
1902 1903 1904 |
static struct attribute *cpuhp_cpu_attrs[] = { &dev_attr_state.attr, &dev_attr_target.attr, |
1db49484f smp/hotplug: Hotp... |
1905 |
&dev_attr_fail.attr, |
98f8cdce1 cpu/hotplug: Add ... |
1906 1907 |
NULL }; |
993647a29 cpu/hotplug: Cons... |
1908 |
static const struct attribute_group cpuhp_cpu_attr_group = { |
98f8cdce1 cpu/hotplug: Add ... |
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 |
.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... |
1921 |
for (i = CPUHP_OFFLINE; i <= CPUHP_ONLINE; i++) { |
98f8cdce1 cpu/hotplug: Add ... |
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 |
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 }; |
993647a29 cpu/hotplug: Cons... |
1940 |
static const struct attribute_group cpuhp_cpu_root_attr_group = { |
98f8cdce1 cpu/hotplug: Add ... |
1941 1942 1943 1944 |
.attrs = cpuhp_cpu_root_attrs, .name = "hotplug", NULL }; |
c5ac43ee8 cpu/hotplug: Prov... |
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 |
#ifdef CONFIG_HOTPLUG_SMT static const char *smt_states[] = { [CPU_SMT_ENABLED] = "on", [CPU_SMT_DISABLED] = "off", [CPU_SMT_FORCE_DISABLED] = "forceoff", [CPU_SMT_NOT_SUPPORTED] = "notsupported", }; static ssize_t show_smt_control(struct device *dev, struct device_attribute *attr, char *buf) { return snprintf(buf, PAGE_SIZE - 2, "%s ", smt_states[cpu_smt_control]); } static void cpuhp_offline_cpu_device(unsigned int cpu) { struct device *dev = get_cpu_device(cpu); dev->offline = true; /* Tell user space about the state change */ kobject_uevent(&dev->kobj, KOBJ_OFFLINE); } |
ac10995a7 cpu/hotplug: Onli... |
1969 1970 1971 1972 1973 1974 1975 1976 |
static void cpuhp_online_cpu_device(unsigned int cpu) { struct device *dev = get_cpu_device(cpu); dev->offline = false; /* Tell user space about the state change */ kobject_uevent(&dev->kobj, KOBJ_ONLINE); } |
c5ac43ee8 cpu/hotplug: Prov... |
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 |
static int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { int cpu, ret = 0; cpu_maps_update_begin(); for_each_online_cpu(cpu) { if (topology_is_primary_thread(cpu)) continue; ret = cpu_down_maps_locked(cpu, CPUHP_OFFLINE); if (ret) break; /* * As this needs to hold the cpu maps lock it's impossible * to call device_offline() because that ends up calling * cpu_down() which takes cpu maps lock. cpu maps lock * needs to be held as this might race against in kernel * abusers of the hotplug machinery (thermal management). * * So nothing would update device:offline state. That would * leave the sysfs entry stale and prevent onlining after * smt control has been changed to 'off' again. This is * called under the sysfs hotplug lock, so it is properly * serialized against the regular offline usage. */ cpuhp_offline_cpu_device(cpu); } |
300a6f27d x86/speculation: ... |
2003 |
if (!ret) { |
c5ac43ee8 cpu/hotplug: Prov... |
2004 |
cpu_smt_control = ctrlval; |
300a6f27d x86/speculation: ... |
2005 2006 |
arch_smt_update(); } |
c5ac43ee8 cpu/hotplug: Prov... |
2007 2008 2009 |
cpu_maps_update_done(); return ret; } |
ac10995a7 cpu/hotplug: Onli... |
2010 |
static int cpuhp_smt_enable(void) |
c5ac43ee8 cpu/hotplug: Prov... |
2011 |
{ |
ac10995a7 cpu/hotplug: Onli... |
2012 |
int cpu, ret = 0; |
c5ac43ee8 cpu/hotplug: Prov... |
2013 2014 |
cpu_maps_update_begin(); cpu_smt_control = CPU_SMT_ENABLED; |
300a6f27d x86/speculation: ... |
2015 |
arch_smt_update(); |
ac10995a7 cpu/hotplug: Onli... |
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 |
for_each_present_cpu(cpu) { /* Skip online CPUs and CPUs on offline nodes */ if (cpu_online(cpu) || !node_online(cpu_to_node(cpu))) continue; ret = _cpu_up(cpu, 0, CPUHP_ONLINE); if (ret) break; /* See comment in cpuhp_smt_disable() */ cpuhp_online_cpu_device(cpu); } |
c5ac43ee8 cpu/hotplug: Prov... |
2026 |
cpu_maps_update_done(); |
ac10995a7 cpu/hotplug: Onli... |
2027 |
return ret; |
c5ac43ee8 cpu/hotplug: Prov... |
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 |
} static ssize_t store_smt_control(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ctrlval, ret; if (sysfs_streq(buf, "on")) ctrlval = CPU_SMT_ENABLED; else if (sysfs_streq(buf, "off")) ctrlval = CPU_SMT_DISABLED; else if (sysfs_streq(buf, "forceoff")) ctrlval = CPU_SMT_FORCE_DISABLED; else return -EINVAL; if (cpu_smt_control == CPU_SMT_FORCE_DISABLED) return -EPERM; if (cpu_smt_control == CPU_SMT_NOT_SUPPORTED) return -ENODEV; ret = lock_device_hotplug_sysfs(); if (ret) return ret; if (ctrlval != cpu_smt_control) { switch (ctrlval) { case CPU_SMT_ENABLED: |
ac10995a7 cpu/hotplug: Onli... |
2058 |
ret = cpuhp_smt_enable(); |
c5ac43ee8 cpu/hotplug: Prov... |
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 |
break; case CPU_SMT_DISABLED: case CPU_SMT_FORCE_DISABLED: ret = cpuhp_smt_disable(ctrlval); break; } } unlock_device_hotplug(); return ret ? ret : count; } static DEVICE_ATTR(control, 0644, show_smt_control, store_smt_control); static ssize_t show_smt_active(struct device *dev, struct device_attribute *attr, char *buf) { bool active = topology_max_smt_threads() > 1; return snprintf(buf, PAGE_SIZE - 2, "%d ", active); } static DEVICE_ATTR(active, 0444, show_smt_active, NULL); static struct attribute *cpuhp_smt_attrs[] = { &dev_attr_control.attr, &dev_attr_active.attr, NULL }; static const struct attribute_group cpuhp_smt_attr_group = { .attrs = cpuhp_smt_attrs, .name = "smt", NULL }; static int __init cpu_smt_state_init(void) { |
c5ac43ee8 cpu/hotplug: Prov... |
2096 2097 2098 2099 2100 2101 2102 |
return sysfs_create_group(&cpu_subsys.dev_root->kobj, &cpuhp_smt_attr_group); } #else static inline int cpu_smt_state_init(void) { return 0; } #endif |
98f8cdce1 cpu/hotplug: Add ... |
2103 2104 2105 |
static int __init cpuhp_sysfs_init(void) { int cpu, ret; |
c5ac43ee8 cpu/hotplug: Prov... |
2106 2107 2108 |
ret = cpu_smt_state_init(); if (ret) return ret; |
98f8cdce1 cpu/hotplug: Add ... |
2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 |
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... |
2127 2128 2129 2130 |
/* * cpu_bit_bitmap[] is a special, "compressed" data structure that * represents all NR_CPUS bits binary values of 1<<nr. * |
e0b582ec5 cpumask: convert ... |
2131 |
* It is used by cpumask_of() to get a constant address to a CPU |
e56b3bc79 cpu masks: optimi... |
2132 2133 |
* mask value that has a single bit set only. */ |
b8d317d10 cpumask: make cpu... |
2134 |
|
e56b3bc79 cpu masks: optimi... |
2135 |
/* cpu_bit_bitmap[0] is empty - so we can back into it */ |
4d51985e4 kernel/cpu.c: fix... |
2136 |
#define MASK_DECLARE_1(x) [x+1][0] = (1UL << (x)) |
e56b3bc79 cpu masks: optimi... |
2137 2138 2139 |
#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... |
2140 |
|
e56b3bc79 cpu masks: optimi... |
2141 2142 2143 2144 2145 2146 2147 |
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... |
2148 2149 |
#endif }; |
e56b3bc79 cpu masks: optimi... |
2150 |
EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
2d3854a37 cpumask: introduc... |
2151 2152 2153 |
const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; EXPORT_SYMBOL(cpu_all_bits); |
b3199c025 cpumask: switch o... |
2154 2155 |
#ifdef CONFIG_INIT_ALL_POSSIBLE |
4b804c85d kernel/cpu.c: exp... |
2156 |
struct cpumask __cpu_possible_mask __read_mostly |
c4c54dd1c kernel/cpu.c: cha... |
2157 |
= {CPU_BITS_ALL}; |
b3199c025 cpumask: switch o... |
2158 |
#else |
4b804c85d kernel/cpu.c: exp... |
2159 |
struct cpumask __cpu_possible_mask __read_mostly; |
b3199c025 cpumask: switch o... |
2160 |
#endif |
4b804c85d kernel/cpu.c: exp... |
2161 |
EXPORT_SYMBOL(__cpu_possible_mask); |
b3199c025 cpumask: switch o... |
2162 |
|
4b804c85d kernel/cpu.c: exp... |
2163 2164 |
struct cpumask __cpu_online_mask __read_mostly; EXPORT_SYMBOL(__cpu_online_mask); |
b3199c025 cpumask: switch o... |
2165 |
|
4b804c85d kernel/cpu.c: exp... |
2166 2167 |
struct cpumask __cpu_present_mask __read_mostly; EXPORT_SYMBOL(__cpu_present_mask); |
b3199c025 cpumask: switch o... |
2168 |
|
4b804c85d kernel/cpu.c: exp... |
2169 2170 |
struct cpumask __cpu_active_mask __read_mostly; EXPORT_SYMBOL(__cpu_active_mask); |
3fa415206 cpumask: make set... |
2171 |
|
3fa415206 cpumask: make set... |
2172 2173 |
void init_cpu_present(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
2174 |
cpumask_copy(&__cpu_present_mask, src); |
3fa415206 cpumask: make set... |
2175 2176 2177 2178 |
} void init_cpu_possible(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
2179 |
cpumask_copy(&__cpu_possible_mask, src); |
3fa415206 cpumask: make set... |
2180 2181 2182 2183 |
} void init_cpu_online(const struct cpumask *src) { |
c4c54dd1c kernel/cpu.c: cha... |
2184 |
cpumask_copy(&__cpu_online_mask, src); |
3fa415206 cpumask: make set... |
2185 |
} |
cff7d378d cpu/hotplug: Conv... |
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 |
/* * 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); |
8ce371f98 lockdep: Fix per-... |
2199 2200 2201 2202 |
#ifdef CONFIG_SMP __boot_cpu_id = cpu; #endif |
cff7d378d cpu/hotplug: Conv... |
2203 2204 2205 2206 2207 |
} /* * Must be called _AFTER_ setting up the per_cpu areas */ |
b7722f4ac init: rename and ... |
2208 |
void __init boot_cpu_hotplug_init(void) |
cff7d378d cpu/hotplug: Conv... |
2209 |
{ |
7bdbaba8e cpu/hotplug: Non-... |
2210 |
#ifdef CONFIG_SMP |
7f2229c92 cpu/hotplug: Boot... |
2211 |
this_cpu_write(cpuhp_state.booted_once, true); |
7bdbaba8e cpu/hotplug: Non-... |
2212 |
#endif |
7f2229c92 cpu/hotplug: Boot... |
2213 |
this_cpu_write(cpuhp_state.state, CPUHP_ONLINE); |
cff7d378d cpu/hotplug: Conv... |
2214 |
} |