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* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits) Revert "tracing: Include module.h in define_trace.h" irq: don't put module.h into irq.h for tracking irqgen modules. bluetooth: macroize two small inlines to avoid module.h ip_vs.h: fix implicit use of module_get/module_put from module.h nf_conntrack.h: fix up fallout from implicit moduleparam.h presence include: replace linux/module.h with "struct module" wherever possible include: convert various register fcns to macros to avoid include chaining crypto.h: remove unused crypto_tfm_alg_modname() inline uwb.h: fix implicit use of asm/page.h for PAGE_SIZE pm_runtime.h: explicitly requires notifier.h linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h miscdevice.h: fix up implicit use of lists and types stop_machine.h: fix implicit use of smp.h for smp_processor_id of: fix implicit use of errno.h in include/linux/of.h of_platform.h: delete needless include <linux/module.h> acpi: remove module.h include from platform/aclinux.h miscdevice.h: delete unnecessary inclusion of module.h device_cgroup.h: delete needless include <linux/module.h> net: sch_generic remove redundant use of <linux/module.h> net: inet_timewait_sock doesnt need <linux/module.h> ... Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in - drivers/media/dvb/frontends/dibx000_common.c - drivers/media/video/{mt9m111.c,ov6650.c} - drivers/mfd/ab3550-core.c - include/linux/dmaengine.h
580 lines
16 KiB
C
580 lines
16 KiB
C
/*
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* kernel/stop_machine.c
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*
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* Copyright (C) 2008, 2005 IBM Corporation.
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* Copyright (C) 2008, 2005 Rusty Russell rusty@rustcorp.com.au
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* Copyright (C) 2010 SUSE Linux Products GmbH
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* Copyright (C) 2010 Tejun Heo <tj@kernel.org>
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*
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* This file is released under the GPLv2 and any later version.
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*/
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#include <linux/completion.h>
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#include <linux/cpu.h>
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#include <linux/init.h>
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#include <linux/kthread.h>
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#include <linux/export.h>
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#include <linux/percpu.h>
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#include <linux/sched.h>
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#include <linux/stop_machine.h>
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#include <linux/interrupt.h>
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#include <linux/kallsyms.h>
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#include <linux/atomic.h>
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/*
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* Structure to determine completion condition and record errors. May
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* be shared by works on different cpus.
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*/
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struct cpu_stop_done {
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atomic_t nr_todo; /* nr left to execute */
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bool executed; /* actually executed? */
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int ret; /* collected return value */
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struct completion completion; /* fired if nr_todo reaches 0 */
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};
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/* the actual stopper, one per every possible cpu, enabled on online cpus */
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struct cpu_stopper {
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spinlock_t lock;
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bool enabled; /* is this stopper enabled? */
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struct list_head works; /* list of pending works */
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struct task_struct *thread; /* stopper thread */
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};
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static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
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static bool stop_machine_initialized = false;
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static void cpu_stop_init_done(struct cpu_stop_done *done, unsigned int nr_todo)
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{
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memset(done, 0, sizeof(*done));
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atomic_set(&done->nr_todo, nr_todo);
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init_completion(&done->completion);
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}
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/* signal completion unless @done is NULL */
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static void cpu_stop_signal_done(struct cpu_stop_done *done, bool executed)
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{
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if (done) {
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if (executed)
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done->executed = true;
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if (atomic_dec_and_test(&done->nr_todo))
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complete(&done->completion);
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}
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}
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/* queue @work to @stopper. if offline, @work is completed immediately */
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static void cpu_stop_queue_work(struct cpu_stopper *stopper,
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struct cpu_stop_work *work)
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{
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unsigned long flags;
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spin_lock_irqsave(&stopper->lock, flags);
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if (stopper->enabled) {
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list_add_tail(&work->list, &stopper->works);
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wake_up_process(stopper->thread);
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} else
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cpu_stop_signal_done(work->done, false);
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spin_unlock_irqrestore(&stopper->lock, flags);
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}
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/**
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* stop_one_cpu - stop a cpu
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* @cpu: cpu to stop
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* @fn: function to execute
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* @arg: argument to @fn
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*
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* Execute @fn(@arg) on @cpu. @fn is run in a process context with
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* the highest priority preempting any task on the cpu and
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* monopolizing it. This function returns after the execution is
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* complete.
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*
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* This function doesn't guarantee @cpu stays online till @fn
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* completes. If @cpu goes down in the middle, execution may happen
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* partially or fully on different cpus. @fn should either be ready
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* for that or the caller should ensure that @cpu stays online until
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* this function completes.
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*
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* CONTEXT:
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* Might sleep.
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*
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* RETURNS:
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* -ENOENT if @fn(@arg) was not executed because @cpu was offline;
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* otherwise, the return value of @fn.
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*/
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int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg)
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{
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struct cpu_stop_done done;
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struct cpu_stop_work work = { .fn = fn, .arg = arg, .done = &done };
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cpu_stop_init_done(&done, 1);
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cpu_stop_queue_work(&per_cpu(cpu_stopper, cpu), &work);
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wait_for_completion(&done.completion);
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return done.executed ? done.ret : -ENOENT;
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}
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/**
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* stop_one_cpu_nowait - stop a cpu but don't wait for completion
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* @cpu: cpu to stop
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* @fn: function to execute
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* @arg: argument to @fn
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*
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* Similar to stop_one_cpu() but doesn't wait for completion. The
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* caller is responsible for ensuring @work_buf is currently unused
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* and will remain untouched until stopper starts executing @fn.
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*
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* CONTEXT:
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* Don't care.
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*/
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void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
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struct cpu_stop_work *work_buf)
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{
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*work_buf = (struct cpu_stop_work){ .fn = fn, .arg = arg, };
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cpu_stop_queue_work(&per_cpu(cpu_stopper, cpu), work_buf);
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}
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/* static data for stop_cpus */
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static DEFINE_MUTEX(stop_cpus_mutex);
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static DEFINE_PER_CPU(struct cpu_stop_work, stop_cpus_work);
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static void queue_stop_cpus_work(const struct cpumask *cpumask,
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cpu_stop_fn_t fn, void *arg,
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struct cpu_stop_done *done)
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{
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struct cpu_stop_work *work;
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unsigned int cpu;
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/* initialize works and done */
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for_each_cpu(cpu, cpumask) {
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work = &per_cpu(stop_cpus_work, cpu);
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work->fn = fn;
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work->arg = arg;
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work->done = done;
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}
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/*
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* Disable preemption while queueing to avoid getting
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* preempted by a stopper which might wait for other stoppers
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* to enter @fn which can lead to deadlock.
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*/
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preempt_disable();
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for_each_cpu(cpu, cpumask)
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cpu_stop_queue_work(&per_cpu(cpu_stopper, cpu),
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&per_cpu(stop_cpus_work, cpu));
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preempt_enable();
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}
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static int __stop_cpus(const struct cpumask *cpumask,
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cpu_stop_fn_t fn, void *arg)
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{
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struct cpu_stop_done done;
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cpu_stop_init_done(&done, cpumask_weight(cpumask));
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queue_stop_cpus_work(cpumask, fn, arg, &done);
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wait_for_completion(&done.completion);
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return done.executed ? done.ret : -ENOENT;
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}
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/**
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* stop_cpus - stop multiple cpus
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* @cpumask: cpus to stop
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* @fn: function to execute
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* @arg: argument to @fn
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*
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* Execute @fn(@arg) on online cpus in @cpumask. On each target cpu,
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* @fn is run in a process context with the highest priority
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* preempting any task on the cpu and monopolizing it. This function
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* returns after all executions are complete.
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*
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* This function doesn't guarantee the cpus in @cpumask stay online
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* till @fn completes. If some cpus go down in the middle, execution
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* on the cpu may happen partially or fully on different cpus. @fn
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* should either be ready for that or the caller should ensure that
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* the cpus stay online until this function completes.
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*
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* All stop_cpus() calls are serialized making it safe for @fn to wait
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* for all cpus to start executing it.
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*
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* CONTEXT:
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* Might sleep.
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*
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* RETURNS:
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* -ENOENT if @fn(@arg) was not executed at all because all cpus in
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* @cpumask were offline; otherwise, 0 if all executions of @fn
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* returned 0, any non zero return value if any returned non zero.
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*/
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int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
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{
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int ret;
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/* static works are used, process one request at a time */
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mutex_lock(&stop_cpus_mutex);
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ret = __stop_cpus(cpumask, fn, arg);
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mutex_unlock(&stop_cpus_mutex);
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return ret;
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}
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/**
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* try_stop_cpus - try to stop multiple cpus
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* @cpumask: cpus to stop
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* @fn: function to execute
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* @arg: argument to @fn
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*
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* Identical to stop_cpus() except that it fails with -EAGAIN if
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* someone else is already using the facility.
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*
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* CONTEXT:
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* Might sleep.
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*
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* RETURNS:
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* -EAGAIN if someone else is already stopping cpus, -ENOENT if
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* @fn(@arg) was not executed at all because all cpus in @cpumask were
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* offline; otherwise, 0 if all executions of @fn returned 0, any non
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* zero return value if any returned non zero.
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*/
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int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
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{
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int ret;
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/* static works are used, process one request at a time */
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if (!mutex_trylock(&stop_cpus_mutex))
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return -EAGAIN;
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ret = __stop_cpus(cpumask, fn, arg);
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mutex_unlock(&stop_cpus_mutex);
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return ret;
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}
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static int cpu_stopper_thread(void *data)
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{
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struct cpu_stopper *stopper = data;
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struct cpu_stop_work *work;
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int ret;
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repeat:
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set_current_state(TASK_INTERRUPTIBLE); /* mb paired w/ kthread_stop */
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if (kthread_should_stop()) {
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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work = NULL;
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spin_lock_irq(&stopper->lock);
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if (!list_empty(&stopper->works)) {
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work = list_first_entry(&stopper->works,
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struct cpu_stop_work, list);
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list_del_init(&work->list);
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}
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spin_unlock_irq(&stopper->lock);
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if (work) {
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cpu_stop_fn_t fn = work->fn;
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void *arg = work->arg;
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struct cpu_stop_done *done = work->done;
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char ksym_buf[KSYM_NAME_LEN] __maybe_unused;
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__set_current_state(TASK_RUNNING);
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/* cpu stop callbacks are not allowed to sleep */
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preempt_disable();
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ret = fn(arg);
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if (ret)
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done->ret = ret;
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/* restore preemption and check it's still balanced */
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preempt_enable();
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WARN_ONCE(preempt_count(),
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"cpu_stop: %s(%p) leaked preempt count\n",
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kallsyms_lookup((unsigned long)fn, NULL, NULL, NULL,
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ksym_buf), arg);
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cpu_stop_signal_done(done, true);
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} else
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schedule();
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goto repeat;
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}
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extern void sched_set_stop_task(int cpu, struct task_struct *stop);
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/* manage stopper for a cpu, mostly lifted from sched migration thread mgmt */
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static int __cpuinit cpu_stop_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
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struct task_struct *p;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_UP_PREPARE:
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BUG_ON(stopper->thread || stopper->enabled ||
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!list_empty(&stopper->works));
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p = kthread_create_on_node(cpu_stopper_thread,
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stopper,
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cpu_to_node(cpu),
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"migration/%d", cpu);
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if (IS_ERR(p))
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return notifier_from_errno(PTR_ERR(p));
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get_task_struct(p);
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kthread_bind(p, cpu);
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sched_set_stop_task(cpu, p);
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stopper->thread = p;
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break;
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case CPU_ONLINE:
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/* strictly unnecessary, as first user will wake it */
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wake_up_process(stopper->thread);
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/* mark enabled */
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spin_lock_irq(&stopper->lock);
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stopper->enabled = true;
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spin_unlock_irq(&stopper->lock);
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break;
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#ifdef CONFIG_HOTPLUG_CPU
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case CPU_UP_CANCELED:
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case CPU_POST_DEAD:
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{
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struct cpu_stop_work *work;
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sched_set_stop_task(cpu, NULL);
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/* kill the stopper */
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kthread_stop(stopper->thread);
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/* drain remaining works */
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spin_lock_irq(&stopper->lock);
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list_for_each_entry(work, &stopper->works, list)
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cpu_stop_signal_done(work->done, false);
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stopper->enabled = false;
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spin_unlock_irq(&stopper->lock);
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/* release the stopper */
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put_task_struct(stopper->thread);
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stopper->thread = NULL;
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break;
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}
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#endif
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}
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return NOTIFY_OK;
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}
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/*
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* Give it a higher priority so that cpu stopper is available to other
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* cpu notifiers. It currently shares the same priority as sched
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* migration_notifier.
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*/
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static struct notifier_block __cpuinitdata cpu_stop_cpu_notifier = {
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.notifier_call = cpu_stop_cpu_callback,
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.priority = 10,
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};
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static int __init cpu_stop_init(void)
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{
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void *bcpu = (void *)(long)smp_processor_id();
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unsigned int cpu;
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int err;
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for_each_possible_cpu(cpu) {
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struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
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spin_lock_init(&stopper->lock);
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INIT_LIST_HEAD(&stopper->works);
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}
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/* start one for the boot cpu */
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err = cpu_stop_cpu_callback(&cpu_stop_cpu_notifier, CPU_UP_PREPARE,
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bcpu);
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BUG_ON(err != NOTIFY_OK);
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cpu_stop_cpu_callback(&cpu_stop_cpu_notifier, CPU_ONLINE, bcpu);
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register_cpu_notifier(&cpu_stop_cpu_notifier);
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stop_machine_initialized = true;
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return 0;
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}
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early_initcall(cpu_stop_init);
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#ifdef CONFIG_STOP_MACHINE
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/* This controls the threads on each CPU. */
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enum stopmachine_state {
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/* Dummy starting state for thread. */
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STOPMACHINE_NONE,
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/* Awaiting everyone to be scheduled. */
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STOPMACHINE_PREPARE,
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/* Disable interrupts. */
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STOPMACHINE_DISABLE_IRQ,
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/* Run the function */
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STOPMACHINE_RUN,
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/* Exit */
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STOPMACHINE_EXIT,
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};
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struct stop_machine_data {
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int (*fn)(void *);
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void *data;
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/* Like num_online_cpus(), but hotplug cpu uses us, so we need this. */
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unsigned int num_threads;
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const struct cpumask *active_cpus;
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enum stopmachine_state state;
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atomic_t thread_ack;
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};
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static void set_state(struct stop_machine_data *smdata,
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enum stopmachine_state newstate)
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{
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/* Reset ack counter. */
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atomic_set(&smdata->thread_ack, smdata->num_threads);
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smp_wmb();
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smdata->state = newstate;
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}
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/* Last one to ack a state moves to the next state. */
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static void ack_state(struct stop_machine_data *smdata)
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{
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if (atomic_dec_and_test(&smdata->thread_ack))
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set_state(smdata, smdata->state + 1);
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}
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/* This is the cpu_stop function which stops the CPU. */
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static int stop_machine_cpu_stop(void *data)
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{
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struct stop_machine_data *smdata = data;
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enum stopmachine_state curstate = STOPMACHINE_NONE;
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int cpu = smp_processor_id(), err = 0;
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unsigned long flags;
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bool is_active;
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/*
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* When called from stop_machine_from_inactive_cpu(), irq might
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* already be disabled. Save the state and restore it on exit.
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*/
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local_save_flags(flags);
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if (!smdata->active_cpus)
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is_active = cpu == cpumask_first(cpu_online_mask);
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else
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is_active = cpumask_test_cpu(cpu, smdata->active_cpus);
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/* Simple state machine */
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do {
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/* Chill out and ensure we re-read stopmachine_state. */
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cpu_relax();
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if (smdata->state != curstate) {
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curstate = smdata->state;
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switch (curstate) {
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case STOPMACHINE_DISABLE_IRQ:
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local_irq_disable();
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hard_irq_disable();
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break;
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case STOPMACHINE_RUN:
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if (is_active)
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err = smdata->fn(smdata->data);
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break;
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default:
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break;
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}
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ack_state(smdata);
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}
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} while (curstate != STOPMACHINE_EXIT);
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local_irq_restore(flags);
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return err;
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}
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int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
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{
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struct stop_machine_data smdata = { .fn = fn, .data = data,
|
|
.num_threads = num_online_cpus(),
|
|
.active_cpus = cpus };
|
|
|
|
if (!stop_machine_initialized) {
|
|
/*
|
|
* Handle the case where stop_machine() is called
|
|
* early in boot before stop_machine() has been
|
|
* initialized.
|
|
*/
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
WARN_ON_ONCE(smdata.num_threads != 1);
|
|
|
|
local_irq_save(flags);
|
|
hard_irq_disable();
|
|
ret = (*fn)(data);
|
|
local_irq_restore(flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Set the initial state and stop all online cpus. */
|
|
set_state(&smdata, STOPMACHINE_PREPARE);
|
|
return stop_cpus(cpu_online_mask, stop_machine_cpu_stop, &smdata);
|
|
}
|
|
|
|
int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
|
|
{
|
|
int ret;
|
|
|
|
/* No CPUs can come up or down during this. */
|
|
get_online_cpus();
|
|
ret = __stop_machine(fn, data, cpus);
|
|
put_online_cpus();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(stop_machine);
|
|
|
|
/**
|
|
* stop_machine_from_inactive_cpu - stop_machine() from inactive CPU
|
|
* @fn: the function to run
|
|
* @data: the data ptr for the @fn()
|
|
* @cpus: the cpus to run the @fn() on (NULL = any online cpu)
|
|
*
|
|
* This is identical to stop_machine() but can be called from a CPU which
|
|
* is not active. The local CPU is in the process of hotplug (so no other
|
|
* CPU hotplug can start) and not marked active and doesn't have enough
|
|
* context to sleep.
|
|
*
|
|
* This function provides stop_machine() functionality for such state by
|
|
* using busy-wait for synchronization and executing @fn directly for local
|
|
* CPU.
|
|
*
|
|
* CONTEXT:
|
|
* Local CPU is inactive. Temporarily stops all active CPUs.
|
|
*
|
|
* RETURNS:
|
|
* 0 if all executions of @fn returned 0, any non zero return value if any
|
|
* returned non zero.
|
|
*/
|
|
int stop_machine_from_inactive_cpu(int (*fn)(void *), void *data,
|
|
const struct cpumask *cpus)
|
|
{
|
|
struct stop_machine_data smdata = { .fn = fn, .data = data,
|
|
.active_cpus = cpus };
|
|
struct cpu_stop_done done;
|
|
int ret;
|
|
|
|
/* Local CPU must be inactive and CPU hotplug in progress. */
|
|
BUG_ON(cpu_active(raw_smp_processor_id()));
|
|
smdata.num_threads = num_active_cpus() + 1; /* +1 for local */
|
|
|
|
/* No proper task established and can't sleep - busy wait for lock. */
|
|
while (!mutex_trylock(&stop_cpus_mutex))
|
|
cpu_relax();
|
|
|
|
/* Schedule work on other CPUs and execute directly for local CPU */
|
|
set_state(&smdata, STOPMACHINE_PREPARE);
|
|
cpu_stop_init_done(&done, num_active_cpus());
|
|
queue_stop_cpus_work(cpu_active_mask, stop_machine_cpu_stop, &smdata,
|
|
&done);
|
|
ret = stop_machine_cpu_stop(&smdata);
|
|
|
|
/* Busy wait for completion. */
|
|
while (!completion_done(&done.completion))
|
|
cpu_relax();
|
|
|
|
mutex_unlock(&stop_cpus_mutex);
|
|
return ret ?: done.ret;
|
|
}
|
|
|
|
#endif /* CONFIG_STOP_MACHINE */
|