If a cpu hotplug callback fails on CPU_UP_PREPARE, all callbacks will be called with CPU_UP_CANCELED. A few of these callbacks assume that on CPU_UP_PREPARE a pointer to task has been stored in a percpu array. This assumption is not true if CPU_UP_PREPARE fails and the following calls to kthread_bind() in CPU_UP_CANCELED will cause an addressing exception because of passing a NULL pointer. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
631 lines
16 KiB
C
631 lines
16 KiB
C
/*
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* linux/kernel/workqueue.c
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*
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* Generic mechanism for defining kernel helper threads for running
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* arbitrary tasks in process context.
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*
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* Started by Ingo Molnar, Copyright (C) 2002
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*
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* Derived from the taskqueue/keventd code by:
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*
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* David Woodhouse <dwmw2@infradead.org>
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* Andrew Morton <andrewm@uow.edu.au>
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* Kai Petzke <wpp@marie.physik.tu-berlin.de>
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* Theodore Ts'o <tytso@mit.edu>
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*
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* Made to use alloc_percpu by Christoph Lameter <clameter@sgi.com>.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/notifier.h>
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#include <linux/kthread.h>
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#include <linux/hardirq.h>
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/*
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* The per-CPU workqueue (if single thread, we always use the first
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* possible cpu).
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*
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* The sequence counters are for flush_scheduled_work(). It wants to wait
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* until until all currently-scheduled works are completed, but it doesn't
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* want to be livelocked by new, incoming ones. So it waits until
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* remove_sequence is >= the insert_sequence which pertained when
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* flush_scheduled_work() was called.
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*/
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struct cpu_workqueue_struct {
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spinlock_t lock;
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long remove_sequence; /* Least-recently added (next to run) */
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long insert_sequence; /* Next to add */
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struct list_head worklist;
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wait_queue_head_t more_work;
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wait_queue_head_t work_done;
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struct workqueue_struct *wq;
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task_t *thread;
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int run_depth; /* Detect run_workqueue() recursion depth */
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} ____cacheline_aligned;
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/*
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* The externally visible workqueue abstraction is an array of
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* per-CPU workqueues:
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*/
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struct workqueue_struct {
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struct cpu_workqueue_struct *cpu_wq;
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const char *name;
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struct list_head list; /* Empty if single thread */
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};
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/* All the per-cpu workqueues on the system, for hotplug cpu to add/remove
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threads to each one as cpus come/go. */
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static DEFINE_SPINLOCK(workqueue_lock);
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static LIST_HEAD(workqueues);
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static int singlethread_cpu;
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/* If it's single threaded, it isn't in the list of workqueues. */
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static inline int is_single_threaded(struct workqueue_struct *wq)
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{
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return list_empty(&wq->list);
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}
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/* Preempt must be disabled. */
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static void __queue_work(struct cpu_workqueue_struct *cwq,
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struct work_struct *work)
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{
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unsigned long flags;
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spin_lock_irqsave(&cwq->lock, flags);
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work->wq_data = cwq;
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list_add_tail(&work->entry, &cwq->worklist);
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cwq->insert_sequence++;
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wake_up(&cwq->more_work);
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spin_unlock_irqrestore(&cwq->lock, flags);
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}
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/*
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* Queue work on a workqueue. Return non-zero if it was successfully
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* added.
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*
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* We queue the work to the CPU it was submitted, but there is no
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* guarantee that it will be processed by that CPU.
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*/
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int fastcall queue_work(struct workqueue_struct *wq, struct work_struct *work)
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{
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int ret = 0, cpu = get_cpu();
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if (!test_and_set_bit(0, &work->pending)) {
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if (unlikely(is_single_threaded(wq)))
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cpu = singlethread_cpu;
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BUG_ON(!list_empty(&work->entry));
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__queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
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ret = 1;
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}
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put_cpu();
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return ret;
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}
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static void delayed_work_timer_fn(unsigned long __data)
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{
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struct work_struct *work = (struct work_struct *)__data;
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struct workqueue_struct *wq = work->wq_data;
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int cpu = smp_processor_id();
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if (unlikely(is_single_threaded(wq)))
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cpu = singlethread_cpu;
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__queue_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
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}
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int fastcall queue_delayed_work(struct workqueue_struct *wq,
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struct work_struct *work, unsigned long delay)
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{
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int ret = 0;
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struct timer_list *timer = &work->timer;
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if (!test_and_set_bit(0, &work->pending)) {
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BUG_ON(timer_pending(timer));
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BUG_ON(!list_empty(&work->entry));
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/* This stores wq for the moment, for the timer_fn */
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work->wq_data = wq;
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timer->expires = jiffies + delay;
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timer->data = (unsigned long)work;
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timer->function = delayed_work_timer_fn;
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add_timer(timer);
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ret = 1;
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}
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return ret;
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}
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static void run_workqueue(struct cpu_workqueue_struct *cwq)
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{
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unsigned long flags;
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/*
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* Keep taking off work from the queue until
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* done.
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*/
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spin_lock_irqsave(&cwq->lock, flags);
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cwq->run_depth++;
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if (cwq->run_depth > 3) {
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/* morton gets to eat his hat */
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printk("%s: recursion depth exceeded: %d\n",
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__FUNCTION__, cwq->run_depth);
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dump_stack();
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}
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while (!list_empty(&cwq->worklist)) {
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struct work_struct *work = list_entry(cwq->worklist.next,
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struct work_struct, entry);
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void (*f) (void *) = work->func;
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void *data = work->data;
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list_del_init(cwq->worklist.next);
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spin_unlock_irqrestore(&cwq->lock, flags);
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BUG_ON(work->wq_data != cwq);
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clear_bit(0, &work->pending);
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f(data);
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spin_lock_irqsave(&cwq->lock, flags);
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cwq->remove_sequence++;
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wake_up(&cwq->work_done);
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}
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cwq->run_depth--;
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spin_unlock_irqrestore(&cwq->lock, flags);
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}
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static int worker_thread(void *__cwq)
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{
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struct cpu_workqueue_struct *cwq = __cwq;
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DECLARE_WAITQUEUE(wait, current);
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struct k_sigaction sa;
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sigset_t blocked;
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current->flags |= PF_NOFREEZE;
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set_user_nice(current, -5);
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/* Block and flush all signals */
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sigfillset(&blocked);
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sigprocmask(SIG_BLOCK, &blocked, NULL);
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flush_signals(current);
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/* SIG_IGN makes children autoreap: see do_notify_parent(). */
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sa.sa.sa_handler = SIG_IGN;
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sa.sa.sa_flags = 0;
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siginitset(&sa.sa.sa_mask, sigmask(SIGCHLD));
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do_sigaction(SIGCHLD, &sa, (struct k_sigaction *)0);
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set_current_state(TASK_INTERRUPTIBLE);
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while (!kthread_should_stop()) {
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add_wait_queue(&cwq->more_work, &wait);
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if (list_empty(&cwq->worklist))
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schedule();
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else
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&cwq->more_work, &wait);
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if (!list_empty(&cwq->worklist))
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run_workqueue(cwq);
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set_current_state(TASK_INTERRUPTIBLE);
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}
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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static void flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
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{
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if (cwq->thread == current) {
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/*
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* Probably keventd trying to flush its own queue. So simply run
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* it by hand rather than deadlocking.
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*/
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run_workqueue(cwq);
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} else {
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DEFINE_WAIT(wait);
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long sequence_needed;
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spin_lock_irq(&cwq->lock);
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sequence_needed = cwq->insert_sequence;
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while (sequence_needed - cwq->remove_sequence > 0) {
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prepare_to_wait(&cwq->work_done, &wait,
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TASK_UNINTERRUPTIBLE);
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spin_unlock_irq(&cwq->lock);
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schedule();
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spin_lock_irq(&cwq->lock);
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}
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finish_wait(&cwq->work_done, &wait);
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spin_unlock_irq(&cwq->lock);
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}
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}
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/*
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* flush_workqueue - ensure that any scheduled work has run to completion.
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*
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* Forces execution of the workqueue and blocks until its completion.
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* This is typically used in driver shutdown handlers.
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*
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* This function will sample each workqueue's current insert_sequence number and
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* will sleep until the head sequence is greater than or equal to that. This
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* means that we sleep until all works which were queued on entry have been
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* handled, but we are not livelocked by new incoming ones.
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*
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* This function used to run the workqueues itself. Now we just wait for the
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* helper threads to do it.
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*/
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void fastcall flush_workqueue(struct workqueue_struct *wq)
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{
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might_sleep();
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if (is_single_threaded(wq)) {
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/* Always use first cpu's area. */
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flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, singlethread_cpu));
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} else {
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int cpu;
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lock_cpu_hotplug();
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for_each_online_cpu(cpu)
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flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
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unlock_cpu_hotplug();
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}
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}
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static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
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int cpu)
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{
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struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
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struct task_struct *p;
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spin_lock_init(&cwq->lock);
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cwq->wq = wq;
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cwq->thread = NULL;
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cwq->insert_sequence = 0;
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cwq->remove_sequence = 0;
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INIT_LIST_HEAD(&cwq->worklist);
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init_waitqueue_head(&cwq->more_work);
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init_waitqueue_head(&cwq->work_done);
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if (is_single_threaded(wq))
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p = kthread_create(worker_thread, cwq, "%s", wq->name);
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else
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p = kthread_create(worker_thread, cwq, "%s/%d", wq->name, cpu);
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if (IS_ERR(p))
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return NULL;
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cwq->thread = p;
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return p;
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}
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struct workqueue_struct *__create_workqueue(const char *name,
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int singlethread)
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{
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int cpu, destroy = 0;
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struct workqueue_struct *wq;
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struct task_struct *p;
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wq = kzalloc(sizeof(*wq), GFP_KERNEL);
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if (!wq)
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return NULL;
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wq->cpu_wq = alloc_percpu(struct cpu_workqueue_struct);
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if (!wq->cpu_wq) {
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kfree(wq);
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return NULL;
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}
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wq->name = name;
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/* We don't need the distraction of CPUs appearing and vanishing. */
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lock_cpu_hotplug();
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if (singlethread) {
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INIT_LIST_HEAD(&wq->list);
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p = create_workqueue_thread(wq, singlethread_cpu);
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if (!p)
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destroy = 1;
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else
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wake_up_process(p);
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} else {
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spin_lock(&workqueue_lock);
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list_add(&wq->list, &workqueues);
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spin_unlock(&workqueue_lock);
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for_each_online_cpu(cpu) {
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p = create_workqueue_thread(wq, cpu);
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if (p) {
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kthread_bind(p, cpu);
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wake_up_process(p);
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} else
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destroy = 1;
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}
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}
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unlock_cpu_hotplug();
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/*
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* Was there any error during startup? If yes then clean up:
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*/
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if (destroy) {
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destroy_workqueue(wq);
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wq = NULL;
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}
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return wq;
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}
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static void cleanup_workqueue_thread(struct workqueue_struct *wq, int cpu)
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{
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struct cpu_workqueue_struct *cwq;
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unsigned long flags;
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struct task_struct *p;
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cwq = per_cpu_ptr(wq->cpu_wq, cpu);
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spin_lock_irqsave(&cwq->lock, flags);
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p = cwq->thread;
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cwq->thread = NULL;
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spin_unlock_irqrestore(&cwq->lock, flags);
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if (p)
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kthread_stop(p);
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}
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void destroy_workqueue(struct workqueue_struct *wq)
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{
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int cpu;
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flush_workqueue(wq);
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/* We don't need the distraction of CPUs appearing and vanishing. */
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lock_cpu_hotplug();
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if (is_single_threaded(wq))
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cleanup_workqueue_thread(wq, singlethread_cpu);
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else {
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for_each_online_cpu(cpu)
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cleanup_workqueue_thread(wq, cpu);
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spin_lock(&workqueue_lock);
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list_del(&wq->list);
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spin_unlock(&workqueue_lock);
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}
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unlock_cpu_hotplug();
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free_percpu(wq->cpu_wq);
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kfree(wq);
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}
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static struct workqueue_struct *keventd_wq;
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int fastcall schedule_work(struct work_struct *work)
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{
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return queue_work(keventd_wq, work);
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}
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int fastcall schedule_delayed_work(struct work_struct *work, unsigned long delay)
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{
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return queue_delayed_work(keventd_wq, work, delay);
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}
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int schedule_delayed_work_on(int cpu,
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struct work_struct *work, unsigned long delay)
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{
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int ret = 0;
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struct timer_list *timer = &work->timer;
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if (!test_and_set_bit(0, &work->pending)) {
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BUG_ON(timer_pending(timer));
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BUG_ON(!list_empty(&work->entry));
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/* This stores keventd_wq for the moment, for the timer_fn */
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work->wq_data = keventd_wq;
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timer->expires = jiffies + delay;
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timer->data = (unsigned long)work;
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timer->function = delayed_work_timer_fn;
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add_timer_on(timer, cpu);
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ret = 1;
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}
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return ret;
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}
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|
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/**
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* schedule_on_each_cpu - call a function on each online CPU from keventd
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* @func: the function to call
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* @info: a pointer to pass to func()
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*
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* Returns zero on success.
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* Returns -ve errno on failure.
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*
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* Appears to be racy against CPU hotplug.
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*
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* schedule_on_each_cpu() is very slow.
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*/
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int schedule_on_each_cpu(void (*func)(void *info), void *info)
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{
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int cpu;
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struct work_struct *works;
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works = alloc_percpu(struct work_struct);
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if (!works)
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return -ENOMEM;
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for_each_online_cpu(cpu) {
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INIT_WORK(per_cpu_ptr(works, cpu), func, info);
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__queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
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per_cpu_ptr(works, cpu));
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}
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flush_workqueue(keventd_wq);
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free_percpu(works);
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return 0;
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}
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|
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void flush_scheduled_work(void)
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{
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flush_workqueue(keventd_wq);
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}
|
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|
|
/**
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* cancel_rearming_delayed_workqueue - reliably kill off a delayed
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* work whose handler rearms the delayed work.
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* @wq: the controlling workqueue structure
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* @work: the delayed work struct
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*/
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void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
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struct work_struct *work)
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{
|
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while (!cancel_delayed_work(work))
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flush_workqueue(wq);
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}
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|
EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
|
|
|
|
/**
|
|
* cancel_rearming_delayed_work - reliably kill off a delayed keventd
|
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* work whose handler rearms the delayed work.
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* @work: the delayed work struct
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*/
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void cancel_rearming_delayed_work(struct work_struct *work)
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{
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cancel_rearming_delayed_workqueue(keventd_wq, work);
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}
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EXPORT_SYMBOL(cancel_rearming_delayed_work);
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|
|
|
/**
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* execute_in_process_context - reliably execute the routine with user context
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* @fn: the function to execute
|
|
* @data: data to pass to the function
|
|
* @ew: guaranteed storage for the execute work structure (must
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* be available when the work executes)
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|
*
|
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* Executes the function immediately if process context is available,
|
|
* otherwise schedules the function for delayed execution.
|
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*
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* Returns: 0 - function was executed
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* 1 - function was scheduled for execution
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|
*/
|
|
int execute_in_process_context(void (*fn)(void *data), void *data,
|
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struct execute_work *ew)
|
|
{
|
|
if (!in_interrupt()) {
|
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fn(data);
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return 0;
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}
|
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|
|
INIT_WORK(&ew->work, fn, data);
|
|
schedule_work(&ew->work);
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(execute_in_process_context);
|
|
|
|
int keventd_up(void)
|
|
{
|
|
return keventd_wq != NULL;
|
|
}
|
|
|
|
int current_is_keventd(void)
|
|
{
|
|
struct cpu_workqueue_struct *cwq;
|
|
int cpu = smp_processor_id(); /* preempt-safe: keventd is per-cpu */
|
|
int ret = 0;
|
|
|
|
BUG_ON(!keventd_wq);
|
|
|
|
cwq = per_cpu_ptr(keventd_wq->cpu_wq, cpu);
|
|
if (current == cwq->thread)
|
|
ret = 1;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/* Take the work from this (downed) CPU. */
|
|
static void take_over_work(struct workqueue_struct *wq, unsigned int cpu)
|
|
{
|
|
struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
|
|
struct list_head list;
|
|
struct work_struct *work;
|
|
|
|
spin_lock_irq(&cwq->lock);
|
|
list_replace_init(&cwq->worklist, &list);
|
|
|
|
while (!list_empty(&list)) {
|
|
printk("Taking work for %s\n", wq->name);
|
|
work = list_entry(list.next,struct work_struct,entry);
|
|
list_del(&work->entry);
|
|
__queue_work(per_cpu_ptr(wq->cpu_wq, smp_processor_id()), work);
|
|
}
|
|
spin_unlock_irq(&cwq->lock);
|
|
}
|
|
|
|
/* We're holding the cpucontrol mutex here */
|
|
static int workqueue_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *hcpu)
|
|
{
|
|
unsigned int hotcpu = (unsigned long)hcpu;
|
|
struct workqueue_struct *wq;
|
|
|
|
switch (action) {
|
|
case CPU_UP_PREPARE:
|
|
/* Create a new workqueue thread for it. */
|
|
list_for_each_entry(wq, &workqueues, list) {
|
|
if (!create_workqueue_thread(wq, hotcpu)) {
|
|
printk("workqueue for %i failed\n", hotcpu);
|
|
return NOTIFY_BAD;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CPU_ONLINE:
|
|
/* Kick off worker threads. */
|
|
list_for_each_entry(wq, &workqueues, list) {
|
|
struct cpu_workqueue_struct *cwq;
|
|
|
|
cwq = per_cpu_ptr(wq->cpu_wq, hotcpu);
|
|
kthread_bind(cwq->thread, hotcpu);
|
|
wake_up_process(cwq->thread);
|
|
}
|
|
break;
|
|
|
|
case CPU_UP_CANCELED:
|
|
list_for_each_entry(wq, &workqueues, list) {
|
|
if (!per_cpu_ptr(wq->cpu_wq, hotcpu)->thread)
|
|
continue;
|
|
/* Unbind so it can run. */
|
|
kthread_bind(per_cpu_ptr(wq->cpu_wq, hotcpu)->thread,
|
|
any_online_cpu(cpu_online_map));
|
|
cleanup_workqueue_thread(wq, hotcpu);
|
|
}
|
|
break;
|
|
|
|
case CPU_DEAD:
|
|
list_for_each_entry(wq, &workqueues, list)
|
|
cleanup_workqueue_thread(wq, hotcpu);
|
|
list_for_each_entry(wq, &workqueues, list)
|
|
take_over_work(wq, hotcpu);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
#endif
|
|
|
|
void init_workqueues(void)
|
|
{
|
|
singlethread_cpu = first_cpu(cpu_possible_map);
|
|
hotcpu_notifier(workqueue_cpu_callback, 0);
|
|
keventd_wq = create_workqueue("events");
|
|
BUG_ON(!keventd_wq);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(__create_workqueue);
|
|
EXPORT_SYMBOL_GPL(queue_work);
|
|
EXPORT_SYMBOL_GPL(queue_delayed_work);
|
|
EXPORT_SYMBOL_GPL(flush_workqueue);
|
|
EXPORT_SYMBOL_GPL(destroy_workqueue);
|
|
|
|
EXPORT_SYMBOL(schedule_work);
|
|
EXPORT_SYMBOL(schedule_delayed_work);
|
|
EXPORT_SYMBOL(schedule_delayed_work_on);
|
|
EXPORT_SYMBOL(flush_scheduled_work);
|