6524d938b3
* Create the cpumask_of_cpu_map statically in the init data section
using NR_CPUS but replace it during boot up with one sized by
nr_cpu_ids (num possible cpus).
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
574 lines
14 KiB
C
574 lines
14 KiB
C
/* CPU control.
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* (C) 2001, 2002, 2003, 2004 Rusty Russell
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*
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* This code is licenced under the GPL.
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*/
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#include <linux/proc_fs.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include <linux/unistd.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/stop_machine.h>
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#include <linux/mutex.h>
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/*
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* Represents all cpu's present in the system
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* In systems capable of hotplug, this map could dynamically grow
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* as new cpu's are detected in the system via any platform specific
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* method, such as ACPI for e.g.
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*/
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cpumask_t cpu_present_map __read_mostly;
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EXPORT_SYMBOL(cpu_present_map);
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#ifndef CONFIG_SMP
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/*
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* Represents all cpu's that are currently online.
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*/
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cpumask_t cpu_online_map __read_mostly = CPU_MASK_ALL;
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EXPORT_SYMBOL(cpu_online_map);
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cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;
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EXPORT_SYMBOL(cpu_possible_map);
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#else /* CONFIG_SMP */
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/* Serializes the updates to cpu_online_map, cpu_present_map */
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static DEFINE_MUTEX(cpu_add_remove_lock);
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static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain);
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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
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*/
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static int cpu_hotplug_disabled;
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static struct {
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struct task_struct *active_writer;
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struct mutex lock; /* Synchronizes accesses to refcount, */
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/*
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* Also blocks the new readers during
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* an ongoing cpu hotplug operation.
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*/
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int refcount;
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} cpu_hotplug;
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void __init cpu_hotplug_init(void)
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{
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cpu_hotplug.active_writer = NULL;
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mutex_init(&cpu_hotplug.lock);
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cpu_hotplug.refcount = 0;
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}
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cpumask_t cpu_active_map;
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#ifdef CONFIG_HOTPLUG_CPU
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void get_online_cpus(void)
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{
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might_sleep();
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if (cpu_hotplug.active_writer == current)
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return;
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mutex_lock(&cpu_hotplug.lock);
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cpu_hotplug.refcount++;
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mutex_unlock(&cpu_hotplug.lock);
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}
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EXPORT_SYMBOL_GPL(get_online_cpus);
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void put_online_cpus(void)
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{
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if (cpu_hotplug.active_writer == current)
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return;
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mutex_lock(&cpu_hotplug.lock);
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if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer))
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wake_up_process(cpu_hotplug.active_writer);
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mutex_unlock(&cpu_hotplug.lock);
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}
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EXPORT_SYMBOL_GPL(put_online_cpus);
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#endif /* CONFIG_HOTPLUG_CPU */
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/*
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* The following two API's must be used when attempting
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* to serialize the updates to cpu_online_map, cpu_present_map.
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*/
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void cpu_maps_update_begin(void)
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{
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mutex_lock(&cpu_add_remove_lock);
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}
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void cpu_maps_update_done(void)
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{
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mutex_unlock(&cpu_add_remove_lock);
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}
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/*
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* This ensures that the hotplug operation can begin only when the
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* refcount goes to zero.
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*
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* Note that during a cpu-hotplug operation, the new readers, if any,
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* will be blocked by the cpu_hotplug.lock
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*
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* Since cpu_hotplug_begin() is always called after invoking
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* cpu_maps_update_begin(), we can be sure that only one writer is active.
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*
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* Note that theoretically, there is a possibility of a livelock:
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* - Refcount goes to zero, last reader wakes up the sleeping
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* writer.
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* - Last reader unlocks the cpu_hotplug.lock.
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* - A new reader arrives at this moment, bumps up the refcount.
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* - The writer acquires the cpu_hotplug.lock finds the refcount
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* non zero and goes to sleep again.
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*
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* However, this is very difficult to achieve in practice since
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* get_online_cpus() not an api which is called all that often.
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*
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*/
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static void cpu_hotplug_begin(void)
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{
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cpu_hotplug.active_writer = current;
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for (;;) {
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mutex_lock(&cpu_hotplug.lock);
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if (likely(!cpu_hotplug.refcount))
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break;
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__set_current_state(TASK_UNINTERRUPTIBLE);
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mutex_unlock(&cpu_hotplug.lock);
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schedule();
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}
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}
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static void cpu_hotplug_done(void)
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{
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cpu_hotplug.active_writer = NULL;
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mutex_unlock(&cpu_hotplug.lock);
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}
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/* Need to know about CPUs going up/down? */
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int __ref register_cpu_notifier(struct notifier_block *nb)
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{
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int ret;
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cpu_maps_update_begin();
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ret = raw_notifier_chain_register(&cpu_chain, nb);
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cpu_maps_update_done();
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return ret;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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EXPORT_SYMBOL(register_cpu_notifier);
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void __ref unregister_cpu_notifier(struct notifier_block *nb)
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{
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cpu_maps_update_begin();
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raw_notifier_chain_unregister(&cpu_chain, nb);
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cpu_maps_update_done();
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}
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EXPORT_SYMBOL(unregister_cpu_notifier);
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static inline void check_for_tasks(int cpu)
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{
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struct task_struct *p;
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write_lock_irq(&tasklist_lock);
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for_each_process(p) {
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if (task_cpu(p) == cpu &&
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(!cputime_eq(p->utime, cputime_zero) ||
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!cputime_eq(p->stime, cputime_zero)))
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printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d\
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(state = %ld, flags = %x) \n",
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p->comm, task_pid_nr(p), cpu,
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p->state, p->flags);
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}
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write_unlock_irq(&tasklist_lock);
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}
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struct take_cpu_down_param {
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unsigned long mod;
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void *hcpu;
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};
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/* Take this CPU down. */
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static int __ref take_cpu_down(void *_param)
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{
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struct take_cpu_down_param *param = _param;
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int err;
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raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
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param->hcpu);
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/* Ensure this CPU doesn't handle any more interrupts. */
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err = __cpu_disable();
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if (err < 0)
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return err;
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/* Force idle task to run as soon as we yield: it should
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immediately notice cpu is offline and die quickly. */
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sched_idle_next();
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return 0;
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}
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/* Requires cpu_add_remove_lock to be held */
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static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
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{
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int err, nr_calls = 0;
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struct task_struct *p;
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cpumask_t old_allowed, tmp;
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void *hcpu = (void *)(long)cpu;
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unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
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struct take_cpu_down_param tcd_param = {
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.mod = mod,
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.hcpu = hcpu,
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};
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if (num_online_cpus() == 1)
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return -EBUSY;
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if (!cpu_online(cpu))
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return -EINVAL;
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cpu_hotplug_begin();
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err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod,
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hcpu, -1, &nr_calls);
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if (err == NOTIFY_BAD) {
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nr_calls--;
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__raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
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hcpu, nr_calls, NULL);
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printk("%s: attempt to take down CPU %u failed\n",
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__func__, cpu);
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err = -EINVAL;
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goto out_release;
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}
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/* Ensure that we are not runnable on dying cpu */
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old_allowed = current->cpus_allowed;
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cpus_setall(tmp);
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cpu_clear(cpu, tmp);
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set_cpus_allowed_ptr(current, &tmp);
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p = __stop_machine_run(take_cpu_down, &tcd_param, cpu);
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if (IS_ERR(p) || cpu_online(cpu)) {
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/* CPU didn't die: tell everyone. Can't complain. */
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if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod,
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hcpu) == NOTIFY_BAD)
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BUG();
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if (IS_ERR(p)) {
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err = PTR_ERR(p);
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goto out_allowed;
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}
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goto out_thread;
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}
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/* Wait for it to sleep (leaving idle task). */
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while (!idle_cpu(cpu))
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yield();
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/* This actually kills the CPU. */
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__cpu_die(cpu);
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/* CPU is completely dead: tell everyone. Too late to complain. */
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if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mod,
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hcpu) == NOTIFY_BAD)
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BUG();
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check_for_tasks(cpu);
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out_thread:
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err = kthread_stop(p);
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out_allowed:
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set_cpus_allowed_ptr(current, &old_allowed);
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out_release:
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cpu_hotplug_done();
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if (!err) {
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if (raw_notifier_call_chain(&cpu_chain, CPU_POST_DEAD | mod,
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hcpu) == NOTIFY_BAD)
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BUG();
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}
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return err;
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}
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int __ref cpu_down(unsigned int cpu)
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{
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int err = 0;
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cpu_maps_update_begin();
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if (cpu_hotplug_disabled) {
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err = -EBUSY;
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goto out;
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}
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cpu_clear(cpu, cpu_active_map);
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/*
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* Make sure the all cpus did the reschedule and are not
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* using stale version of the cpu_active_map.
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* This is not strictly necessary becuase stop_machine()
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* that we run down the line already provides the required
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* synchronization. But it's really a side effect and we do not
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* want to depend on the innards of the stop_machine here.
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*/
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synchronize_sched();
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err = _cpu_down(cpu, 0);
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if (cpu_online(cpu))
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cpu_set(cpu, cpu_active_map);
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out:
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cpu_maps_update_done();
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return err;
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}
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EXPORT_SYMBOL(cpu_down);
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#endif /*CONFIG_HOTPLUG_CPU*/
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/* Requires cpu_add_remove_lock to be held */
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static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
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{
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int ret, nr_calls = 0;
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void *hcpu = (void *)(long)cpu;
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unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
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if (cpu_online(cpu) || !cpu_present(cpu))
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return -EINVAL;
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cpu_hotplug_begin();
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ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu,
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-1, &nr_calls);
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if (ret == NOTIFY_BAD) {
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nr_calls--;
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printk("%s: attempt to bring up CPU %u failed\n",
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__func__, cpu);
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ret = -EINVAL;
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goto out_notify;
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}
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/* Arch-specific enabling code. */
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ret = __cpu_up(cpu);
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if (ret != 0)
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goto out_notify;
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BUG_ON(!cpu_online(cpu));
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/* Now call notifier in preparation. */
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raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
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out_notify:
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if (ret != 0)
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__raw_notifier_call_chain(&cpu_chain,
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CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL);
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cpu_hotplug_done();
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return ret;
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}
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int __cpuinit cpu_up(unsigned int cpu)
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{
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int err = 0;
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if (!cpu_isset(cpu, cpu_possible_map)) {
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printk(KERN_ERR "can't online cpu %d because it is not "
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"configured as may-hotadd at boot time\n", cpu);
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#if defined(CONFIG_IA64) || defined(CONFIG_X86_64) || defined(CONFIG_S390)
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printk(KERN_ERR "please check additional_cpus= boot "
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"parameter\n");
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#endif
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return -EINVAL;
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}
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cpu_maps_update_begin();
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if (cpu_hotplug_disabled) {
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err = -EBUSY;
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goto out;
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}
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err = _cpu_up(cpu, 0);
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if (cpu_online(cpu))
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cpu_set(cpu, cpu_active_map);
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out:
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cpu_maps_update_done();
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return err;
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}
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#ifdef CONFIG_PM_SLEEP_SMP
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static cpumask_t frozen_cpus;
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int disable_nonboot_cpus(void)
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{
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int cpu, first_cpu, error = 0;
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cpu_maps_update_begin();
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first_cpu = first_cpu(cpu_online_map);
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/* We take down all of the non-boot CPUs in one shot to avoid races
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* with the userspace trying to use the CPU hotplug at the same time
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*/
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cpus_clear(frozen_cpus);
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printk("Disabling non-boot CPUs ...\n");
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for_each_online_cpu(cpu) {
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if (cpu == first_cpu)
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continue;
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error = _cpu_down(cpu, 1);
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if (!error) {
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cpu_set(cpu, frozen_cpus);
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printk("CPU%d is down\n", cpu);
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} else {
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printk(KERN_ERR "Error taking CPU%d down: %d\n",
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cpu, error);
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break;
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}
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}
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if (!error) {
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BUG_ON(num_online_cpus() > 1);
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/* Make sure the CPUs won't be enabled by someone else */
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cpu_hotplug_disabled = 1;
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} else {
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printk(KERN_ERR "Non-boot CPUs are not disabled\n");
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}
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cpu_maps_update_done();
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return error;
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}
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void __ref enable_nonboot_cpus(void)
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{
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int cpu, error;
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/* Allow everyone to use the CPU hotplug again */
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cpu_maps_update_begin();
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cpu_hotplug_disabled = 0;
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if (cpus_empty(frozen_cpus))
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goto out;
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printk("Enabling non-boot CPUs ...\n");
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for_each_cpu_mask_nr(cpu, frozen_cpus) {
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error = _cpu_up(cpu, 1);
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if (!error) {
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printk("CPU%d is up\n", cpu);
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continue;
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}
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printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
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}
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cpus_clear(frozen_cpus);
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out:
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cpu_maps_update_done();
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}
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#endif /* CONFIG_PM_SLEEP_SMP */
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#endif /* CONFIG_SMP */
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/* 64 bits of zeros, for initializers. */
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#if BITS_PER_LONG == 32
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#define Z64 0, 0
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#else
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#define Z64 0
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#endif
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/* Initializer macros. */
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#define CMI0(n) { .bits = { 1UL << (n) } }
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#define CMI(n, ...) { .bits = { __VA_ARGS__, 1UL << ((n) % BITS_PER_LONG) } }
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#define CMI8(n, ...) \
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CMI((n), __VA_ARGS__), CMI((n)+1, __VA_ARGS__), \
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CMI((n)+2, __VA_ARGS__), CMI((n)+3, __VA_ARGS__), \
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CMI((n)+4, __VA_ARGS__), CMI((n)+5, __VA_ARGS__), \
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CMI((n)+6, __VA_ARGS__), CMI((n)+7, __VA_ARGS__)
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#if BITS_PER_LONG == 32
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#define CMI64(n, ...) \
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CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
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CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
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CMI8((n)+32, 0, __VA_ARGS__), CMI8((n)+40, 0, __VA_ARGS__), \
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CMI8((n)+48, 0, __VA_ARGS__), CMI8((n)+56, 0, __VA_ARGS__)
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#else
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#define CMI64(n, ...) \
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CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
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CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
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CMI8((n)+32, __VA_ARGS__), CMI8((n)+40, __VA_ARGS__), \
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CMI8((n)+48, __VA_ARGS__), CMI8((n)+56, __VA_ARGS__)
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#endif
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#define CMI256(n, ...) \
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CMI64((n), __VA_ARGS__), CMI64((n)+64, Z64, __VA_ARGS__), \
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CMI64((n)+128, Z64, Z64, __VA_ARGS__), \
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CMI64((n)+192, Z64, Z64, Z64, __VA_ARGS__)
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#define Z256 Z64, Z64, Z64, Z64
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#define CMI1024(n, ...) \
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CMI256((n), __VA_ARGS__), \
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CMI256((n)+256, Z256, __VA_ARGS__), \
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CMI256((n)+512, Z256, Z256, __VA_ARGS__), \
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CMI256((n)+768, Z256, Z256, Z256, __VA_ARGS__)
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#define Z1024 Z256, Z256, Z256, Z256
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/* We want this statically initialized, just to be safe. We try not
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* to waste too much space, either. */
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static const cpumask_t cpumask_map[]
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#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
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__initdata
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#endif
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= {
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CMI0(0), CMI0(1), CMI0(2), CMI0(3),
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#if NR_CPUS > 4
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CMI0(4), CMI0(5), CMI0(6), CMI0(7),
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#endif
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#if NR_CPUS > 8
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CMI0(8), CMI0(9), CMI0(10), CMI0(11),
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CMI0(12), CMI0(13), CMI0(14), CMI0(15),
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#endif
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#if NR_CPUS > 16
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CMI0(16), CMI0(17), CMI0(18), CMI0(19),
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CMI0(20), CMI0(21), CMI0(22), CMI0(23),
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CMI0(24), CMI0(25), CMI0(26), CMI0(27),
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CMI0(28), CMI0(29), CMI0(30), CMI0(31),
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#endif
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#if NR_CPUS > 32
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#if BITS_PER_LONG == 32
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CMI(32, 0), CMI(33, 0), CMI(34, 0), CMI(35, 0),
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CMI(36, 0), CMI(37, 0), CMI(38, 0), CMI(39, 0),
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CMI(40, 0), CMI(41, 0), CMI(42, 0), CMI(43, 0),
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CMI(44, 0), CMI(45, 0), CMI(46, 0), CMI(47, 0),
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CMI(48, 0), CMI(49, 0), CMI(50, 0), CMI(51, 0),
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CMI(52, 0), CMI(53, 0), CMI(54, 0), CMI(55, 0),
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CMI(56, 0), CMI(57, 0), CMI(58, 0), CMI(59, 0),
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CMI(60, 0), CMI(61, 0), CMI(62, 0), CMI(63, 0),
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#else
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CMI0(32), CMI0(33), CMI0(34), CMI0(35),
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CMI0(36), CMI0(37), CMI0(38), CMI0(39),
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CMI0(40), CMI0(41), CMI0(42), CMI0(43),
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CMI0(44), CMI0(45), CMI0(46), CMI0(47),
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CMI0(48), CMI0(49), CMI0(50), CMI0(51),
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CMI0(52), CMI0(53), CMI0(54), CMI0(55),
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CMI0(56), CMI0(57), CMI0(58), CMI0(59),
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CMI0(60), CMI0(61), CMI0(62), CMI0(63),
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#endif /* BITS_PER_LONG == 64 */
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#endif
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#if NR_CPUS > 64
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CMI64(64, Z64),
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#endif
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#if NR_CPUS > 128
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CMI64(128, Z64, Z64), CMI64(192, Z64, Z64, Z64),
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#endif
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#if NR_CPUS > 256
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CMI256(256, Z256),
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#endif
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#if NR_CPUS > 512
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CMI256(512, Z256, Z256), CMI256(768, Z256, Z256, Z256),
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#endif
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#if NR_CPUS > 1024
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CMI1024(1024, Z1024),
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#endif
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#if NR_CPUS > 2048
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CMI1024(2048, Z1024, Z1024), CMI1024(3072, Z1024, Z1024, Z1024),
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#endif
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#if NR_CPUS > 4096
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#error NR_CPUS too big. Fix initializers or set CONFIG_HAVE_CPUMASK_OF_CPU_MAP
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#endif
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};
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const cpumask_t *cpumask_of_cpu_map = cpumask_map;
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