2 * Copyright (c) 2000 Doug Rabson
3 * Copyright (c) 2014 Jeff Roberson
4 * Copyright (c) 2016 Matthew Macy
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/cpuset.h>
36 #include <sys/kernel.h>
37 #include <sys/kthread.h>
38 #include <sys/libkern.h>
39 #include <sys/limits.h>
41 #include <sys/malloc.h>
42 #include <sys/mutex.h>
44 #include <sys/sched.h>
46 #include <sys/gtaskqueue.h>
47 #include <sys/unistd.h>
48 #include <machine/stdarg.h>
50 static MALLOC_DEFINE(M_GTASKQUEUE, "gtaskqueue", "Group Task Queues");
51 static void gtaskqueue_thread_enqueue(void *);
52 static void gtaskqueue_thread_loop(void *arg);
53 static int task_is_running(struct gtaskqueue *queue, struct gtask *gtask);
54 static void gtaskqueue_drain_locked(struct gtaskqueue *queue, struct gtask *gtask);
56 TASKQGROUP_DEFINE(softirq, mp_ncpus, 1);
57 TASKQGROUP_DEFINE(config, 1, 1);
59 struct gtaskqueue_busy {
60 struct gtask *tb_running;
61 TAILQ_ENTRY(gtaskqueue_busy) tb_link;
64 static struct gtask * const TB_DRAIN_WAITER = (struct gtask *)0x1;
66 typedef void (*gtaskqueue_enqueue_fn)(void *context);
69 STAILQ_HEAD(, gtask) tq_queue;
70 gtaskqueue_enqueue_fn tq_enqueue;
73 TAILQ_HEAD(, gtaskqueue_busy) tq_active;
75 struct thread **tq_threads;
80 taskqueue_callback_fn tq_callbacks[TASKQUEUE_NUM_CALLBACKS];
81 void *tq_cb_contexts[TASKQUEUE_NUM_CALLBACKS];
84 #define TQ_FLAGS_ACTIVE (1 << 0)
85 #define TQ_FLAGS_BLOCKED (1 << 1)
86 #define TQ_FLAGS_UNLOCKED_ENQUEUE (1 << 2)
88 #define DT_CALLOUT_ARMED (1 << 0)
93 mtx_lock_spin(&(tq)->tq_mutex); \
95 mtx_lock(&(tq)->tq_mutex); \
97 #define TQ_ASSERT_LOCKED(tq) mtx_assert(&(tq)->tq_mutex, MA_OWNED)
99 #define TQ_UNLOCK(tq) \
102 mtx_unlock_spin(&(tq)->tq_mutex); \
104 mtx_unlock(&(tq)->tq_mutex); \
106 #define TQ_ASSERT_UNLOCKED(tq) mtx_assert(&(tq)->tq_mutex, MA_NOTOWNED)
110 gtask_dump(struct gtask *gtask)
112 printf("gtask: %p ta_flags=%x ta_priority=%d ta_func=%p ta_context=%p\n",
113 gtask, gtask->ta_flags, gtask->ta_priority, gtask->ta_func, gtask->ta_context);
118 TQ_SLEEP(struct gtaskqueue *tq, void *p, struct mtx *m, int pri, const char *wm,
122 return (msleep_spin(p, m, wm, t));
123 return (msleep(p, m, pri, wm, t));
126 static struct gtaskqueue *
127 _gtaskqueue_create(const char *name, int mflags,
128 taskqueue_enqueue_fn enqueue, void *context,
129 int mtxflags, const char *mtxname __unused)
131 struct gtaskqueue *queue;
134 tq_name = malloc(TASKQUEUE_NAMELEN, M_GTASKQUEUE, mflags | M_ZERO);
138 snprintf(tq_name, TASKQUEUE_NAMELEN, "%s", (name) ? name : "taskqueue");
140 queue = malloc(sizeof(struct gtaskqueue), M_GTASKQUEUE, mflags | M_ZERO);
142 free(tq_name, M_GTASKQUEUE);
146 STAILQ_INIT(&queue->tq_queue);
147 TAILQ_INIT(&queue->tq_active);
148 queue->tq_enqueue = enqueue;
149 queue->tq_context = context;
150 queue->tq_name = tq_name;
151 queue->tq_spin = (mtxflags & MTX_SPIN) != 0;
152 queue->tq_flags |= TQ_FLAGS_ACTIVE;
153 if (enqueue == gtaskqueue_thread_enqueue)
154 queue->tq_flags |= TQ_FLAGS_UNLOCKED_ENQUEUE;
155 mtx_init(&queue->tq_mutex, tq_name, NULL, mtxflags);
162 * Signal a taskqueue thread to terminate.
165 gtaskqueue_terminate(struct thread **pp, struct gtaskqueue *tq)
168 while (tq->tq_tcount > 0 || tq->tq_callouts > 0) {
170 TQ_SLEEP(tq, pp, &tq->tq_mutex, PWAIT, "taskqueue_destroy", 0);
175 gtaskqueue_free(struct gtaskqueue *queue)
179 queue->tq_flags &= ~TQ_FLAGS_ACTIVE;
180 gtaskqueue_terminate(queue->tq_threads, queue);
181 KASSERT(TAILQ_EMPTY(&queue->tq_active), ("Tasks still running?"));
182 KASSERT(queue->tq_callouts == 0, ("Armed timeout tasks"));
183 mtx_destroy(&queue->tq_mutex);
184 free(queue->tq_threads, M_GTASKQUEUE);
185 free(queue->tq_name, M_GTASKQUEUE);
186 free(queue, M_GTASKQUEUE);
190 * Wait for all to complete, then prevent it from being enqueued
193 grouptask_block(struct grouptask *grouptask)
195 struct gtaskqueue *queue = grouptask->gt_taskqueue;
196 struct gtask *gtask = &grouptask->gt_task;
201 panic("queue == NULL");
205 gtask->ta_flags |= TASK_NOENQUEUE;
206 gtaskqueue_drain_locked(queue, gtask);
211 grouptask_unblock(struct grouptask *grouptask)
213 struct gtaskqueue *queue = grouptask->gt_taskqueue;
214 struct gtask *gtask = &grouptask->gt_task;
219 panic("queue == NULL");
223 gtask->ta_flags &= ~TASK_NOENQUEUE;
228 grouptaskqueue_enqueue(struct gtaskqueue *queue, struct gtask *gtask)
233 panic("queue == NULL");
237 if (gtask->ta_flags & TASK_ENQUEUED) {
241 if (gtask->ta_flags & TASK_NOENQUEUE) {
245 STAILQ_INSERT_TAIL(&queue->tq_queue, gtask, ta_link);
246 gtask->ta_flags |= TASK_ENQUEUED;
248 if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
249 queue->tq_enqueue(queue->tq_context);
254 gtaskqueue_task_nop_fn(void *context)
259 * Block until all currently queued tasks in this taskqueue
260 * have begun execution. Tasks queued during execution of
261 * this function are ignored.
264 gtaskqueue_drain_tq_queue(struct gtaskqueue *queue)
266 struct gtask t_barrier;
268 if (STAILQ_EMPTY(&queue->tq_queue))
272 * Enqueue our barrier after all current tasks, but with
273 * the highest priority so that newly queued tasks cannot
274 * pass it. Because of the high priority, we can not use
275 * taskqueue_enqueue_locked directly (which drops the lock
276 * anyway) so just insert it at tail while we have the
279 GTASK_INIT(&t_barrier, 0, USHRT_MAX, gtaskqueue_task_nop_fn, &t_barrier);
280 STAILQ_INSERT_TAIL(&queue->tq_queue, &t_barrier, ta_link);
281 t_barrier.ta_flags |= TASK_ENQUEUED;
284 * Once the barrier has executed, all previously queued tasks
285 * have completed or are currently executing.
287 while (t_barrier.ta_flags & TASK_ENQUEUED)
288 TQ_SLEEP(queue, &t_barrier, &queue->tq_mutex, PWAIT, "-", 0);
292 * Block until all currently executing tasks for this taskqueue
293 * complete. Tasks that begin execution during the execution
294 * of this function are ignored.
297 gtaskqueue_drain_tq_active(struct gtaskqueue *queue)
299 struct gtaskqueue_busy tb_marker, *tb_first;
301 if (TAILQ_EMPTY(&queue->tq_active))
304 /* Block taskq_terminate().*/
305 queue->tq_callouts++;
308 * Wait for all currently executing taskqueue threads
311 tb_marker.tb_running = TB_DRAIN_WAITER;
312 TAILQ_INSERT_TAIL(&queue->tq_active, &tb_marker, tb_link);
313 while (TAILQ_FIRST(&queue->tq_active) != &tb_marker)
314 TQ_SLEEP(queue, &tb_marker, &queue->tq_mutex, PWAIT, "-", 0);
315 TAILQ_REMOVE(&queue->tq_active, &tb_marker, tb_link);
318 * Wakeup any other drain waiter that happened to queue up
319 * without any intervening active thread.
321 tb_first = TAILQ_FIRST(&queue->tq_active);
322 if (tb_first != NULL && tb_first->tb_running == TB_DRAIN_WAITER)
325 /* Release taskqueue_terminate(). */
326 queue->tq_callouts--;
327 if ((queue->tq_flags & TQ_FLAGS_ACTIVE) == 0)
328 wakeup_one(queue->tq_threads);
332 gtaskqueue_block(struct gtaskqueue *queue)
336 queue->tq_flags |= TQ_FLAGS_BLOCKED;
341 gtaskqueue_unblock(struct gtaskqueue *queue)
345 queue->tq_flags &= ~TQ_FLAGS_BLOCKED;
346 if (!STAILQ_EMPTY(&queue->tq_queue))
347 queue->tq_enqueue(queue->tq_context);
352 gtaskqueue_run_locked(struct gtaskqueue *queue)
354 struct gtaskqueue_busy tb;
355 struct gtaskqueue_busy *tb_first;
358 KASSERT(queue != NULL, ("tq is NULL"));
359 TQ_ASSERT_LOCKED(queue);
360 tb.tb_running = NULL;
362 while (STAILQ_FIRST(&queue->tq_queue)) {
363 TAILQ_INSERT_TAIL(&queue->tq_active, &tb, tb_link);
366 * Carefully remove the first task from the queue and
367 * clear its TASK_ENQUEUED flag
369 gtask = STAILQ_FIRST(&queue->tq_queue);
370 KASSERT(gtask != NULL, ("task is NULL"));
371 STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
372 gtask->ta_flags &= ~TASK_ENQUEUED;
373 tb.tb_running = gtask;
376 KASSERT(gtask->ta_func != NULL, ("task->ta_func is NULL"));
377 gtask->ta_func(gtask->ta_context);
380 tb.tb_running = NULL;
383 TAILQ_REMOVE(&queue->tq_active, &tb, tb_link);
384 tb_first = TAILQ_FIRST(&queue->tq_active);
385 if (tb_first != NULL &&
386 tb_first->tb_running == TB_DRAIN_WAITER)
392 task_is_running(struct gtaskqueue *queue, struct gtask *gtask)
394 struct gtaskqueue_busy *tb;
396 TQ_ASSERT_LOCKED(queue);
397 TAILQ_FOREACH(tb, &queue->tq_active, tb_link) {
398 if (tb->tb_running == gtask)
405 gtaskqueue_cancel_locked(struct gtaskqueue *queue, struct gtask *gtask)
408 if (gtask->ta_flags & TASK_ENQUEUED)
409 STAILQ_REMOVE(&queue->tq_queue, gtask, gtask, ta_link);
410 gtask->ta_flags &= ~TASK_ENQUEUED;
411 return (task_is_running(queue, gtask) ? EBUSY : 0);
415 gtaskqueue_cancel(struct gtaskqueue *queue, struct gtask *gtask)
420 error = gtaskqueue_cancel_locked(queue, gtask);
427 gtaskqueue_drain_locked(struct gtaskqueue *queue, struct gtask *gtask)
429 while ((gtask->ta_flags & TASK_ENQUEUED) || task_is_running(queue, gtask))
430 TQ_SLEEP(queue, gtask, &queue->tq_mutex, PWAIT, "-", 0);
434 gtaskqueue_drain(struct gtaskqueue *queue, struct gtask *gtask)
438 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
441 gtaskqueue_drain_locked(queue, gtask);
446 gtaskqueue_drain_all(struct gtaskqueue *queue)
450 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
453 gtaskqueue_drain_tq_queue(queue);
454 gtaskqueue_drain_tq_active(queue);
459 _gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
460 cpuset_t *mask, const char *name, va_list ap)
462 char ktname[MAXCOMLEN + 1];
464 struct gtaskqueue *tq;
470 vsnprintf(ktname, sizeof(ktname), name, ap);
473 tq->tq_threads = malloc(sizeof(struct thread *) * count, M_GTASKQUEUE,
475 if (tq->tq_threads == NULL) {
476 printf("%s: no memory for %s threads\n", __func__, ktname);
480 for (i = 0; i < count; i++) {
482 error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
483 &tq->tq_threads[i], RFSTOPPED, 0, "%s", ktname);
485 error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
486 &tq->tq_threads[i], RFSTOPPED, 0,
489 /* should be ok to continue, taskqueue_free will dtrt */
490 printf("%s: kthread_add(%s): error %d", __func__,
492 tq->tq_threads[i] = NULL; /* paranoid */
496 for (i = 0; i < count; i++) {
497 if (tq->tq_threads[i] == NULL)
499 td = tq->tq_threads[i];
501 error = cpuset_setthread(td->td_tid, mask);
503 * Failing to pin is rarely an actual fatal error;
504 * it'll just affect performance.
507 printf("%s: curthread=%llu: can't pin; "
510 (unsigned long long) td->td_tid,
515 sched_add(td, SRQ_BORING);
523 gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
524 const char *name, ...)
530 error = _gtaskqueue_start_threads(tqp, count, pri, NULL, name, ap);
536 gtaskqueue_run_callback(struct gtaskqueue *tq,
537 enum taskqueue_callback_type cb_type)
539 taskqueue_callback_fn tq_callback;
541 TQ_ASSERT_UNLOCKED(tq);
542 tq_callback = tq->tq_callbacks[cb_type];
543 if (tq_callback != NULL)
544 tq_callback(tq->tq_cb_contexts[cb_type]);
548 gtaskqueue_thread_loop(void *arg)
550 struct gtaskqueue **tqp, *tq;
554 gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_INIT);
556 while ((tq->tq_flags & TQ_FLAGS_ACTIVE) != 0) {
558 gtaskqueue_run_locked(tq);
560 * Because taskqueue_run() can drop tq_mutex, we need to
561 * check if the TQ_FLAGS_ACTIVE flag wasn't removed in the
562 * meantime, which means we missed a wakeup.
564 if ((tq->tq_flags & TQ_FLAGS_ACTIVE) == 0)
566 TQ_SLEEP(tq, tq, &tq->tq_mutex, 0, "-", 0);
568 gtaskqueue_run_locked(tq);
570 * This thread is on its way out, so just drop the lock temporarily
571 * in order to call the shutdown callback. This allows the callback
572 * to look at the taskqueue, even just before it dies.
575 gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_SHUTDOWN);
578 /* rendezvous with thread that asked us to terminate */
580 wakeup_one(tq->tq_threads);
586 gtaskqueue_thread_enqueue(void *context)
588 struct gtaskqueue **tqp, *tq;
596 static struct gtaskqueue *
597 gtaskqueue_create_fast(const char *name, int mflags,
598 taskqueue_enqueue_fn enqueue, void *context)
600 return _gtaskqueue_create(name, mflags, enqueue, context,
601 MTX_SPIN, "fast_taskqueue");
605 struct taskqgroup_cpu {
606 LIST_HEAD(, grouptask) tgc_tasks;
607 struct gtaskqueue *tgc_taskq;
613 struct taskqgroup_cpu tqg_queue[MAXCPU];
615 const char * tqg_name;
621 struct taskq_bind_task {
622 struct gtask bt_task;
627 taskqgroup_cpu_create(struct taskqgroup *qgroup, int idx, int cpu)
629 struct taskqgroup_cpu *qcpu;
631 qcpu = &qgroup->tqg_queue[idx];
632 LIST_INIT(&qcpu->tgc_tasks);
633 qcpu->tgc_taskq = gtaskqueue_create_fast(NULL, M_WAITOK,
634 taskqueue_thread_enqueue, &qcpu->tgc_taskq);
635 gtaskqueue_start_threads(&qcpu->tgc_taskq, 1, PI_SOFT,
636 "%s_%d", qgroup->tqg_name, idx);
641 taskqgroup_cpu_remove(struct taskqgroup *qgroup, int idx)
644 gtaskqueue_free(qgroup->tqg_queue[idx].tgc_taskq);
648 * Find the taskq with least # of tasks that doesn't currently have any
649 * other queues from the uniq identifier.
652 taskqgroup_find(struct taskqgroup *qgroup, void *uniq)
658 mtx_assert(&qgroup->tqg_lock, MA_OWNED);
659 if (qgroup->tqg_cnt == 0)
664 * Two passes; First scan for a queue with the least tasks that
665 * does not already service this uniq id. If that fails simply find
666 * the queue with the least total tasks;
668 for (strict = 1; mincnt == INT_MAX; strict = 0) {
669 for (i = 0; i < qgroup->tqg_cnt; i++) {
670 if (qgroup->tqg_queue[i].tgc_cnt > mincnt)
674 &qgroup->tqg_queue[i].tgc_tasks, gt_list)
675 if (n->gt_uniq == uniq)
680 mincnt = qgroup->tqg_queue[i].tgc_cnt;
685 panic("%s: failed to pick a qid.", __func__);
691 * smp_started is unusable since it is not set for UP kernels or even for
692 * SMP kernels when there is 1 CPU. This is usually handled by adding a
693 * (mp_ncpus == 1) test, but that would be broken here since we need to
694 * to synchronize with the SI_SUB_SMP ordering. Even in the pure SMP case
695 * smp_started only gives a fuzzy ordering relative to SI_SUB_SMP.
697 * So maintain our own flag. It must be set after all CPUs are started
698 * and before SI_SUB_SMP:SI_ORDER_ANY so that the SYSINIT for delayed
699 * adjustment is properly delayed. SI_ORDER_FOURTH is clearly before
700 * SI_ORDER_ANY and unclearly after the CPUs are started. It would be
701 * simpler for adjustment to pass a flag indicating if it is delayed.
704 static int tqg_smp_started;
707 tqg_record_smp_started(void *arg)
712 SYSINIT(tqg_record_smp_started, SI_SUB_SMP, SI_ORDER_FOURTH,
713 tqg_record_smp_started, NULL);
716 taskqgroup_attach(struct taskqgroup *qgroup, struct grouptask *gtask,
717 void *uniq, device_t dev, struct resource *irq, const char *name)
721 gtask->gt_uniq = uniq;
722 snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
726 mtx_lock(&qgroup->tqg_lock);
727 qid = taskqgroup_find(qgroup, uniq);
728 qgroup->tqg_queue[qid].tgc_cnt++;
729 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
730 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
731 if (dev != NULL && irq != NULL && tqg_smp_started) {
732 cpu = qgroup->tqg_queue[qid].tgc_cpu;
734 mtx_unlock(&qgroup->tqg_lock);
735 error = bus_bind_intr(dev, irq, cpu);
737 printf("%s: binding interrupt failed for %s: %d\n",
738 __func__, gtask->gt_name, error);
740 mtx_unlock(&qgroup->tqg_lock);
744 taskqgroup_attach_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
748 mtx_lock(&qgroup->tqg_lock);
749 qid = taskqgroup_find(qgroup, gtask->gt_uniq);
750 cpu = qgroup->tqg_queue[qid].tgc_cpu;
751 if (gtask->gt_dev != NULL && gtask->gt_irq != NULL) {
752 mtx_unlock(&qgroup->tqg_lock);
753 error = bus_bind_intr(gtask->gt_dev, gtask->gt_irq, cpu);
754 mtx_lock(&qgroup->tqg_lock);
756 printf("%s: binding interrupt failed for %s: %d\n",
757 __func__, gtask->gt_name, error);
760 qgroup->tqg_queue[qid].tgc_cnt++;
761 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
762 MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
763 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
764 mtx_unlock(&qgroup->tqg_lock);
768 taskqgroup_attach_cpu(struct taskqgroup *qgroup, struct grouptask *gtask,
769 void *uniq, int cpu, device_t dev, struct resource *irq, const char *name)
774 gtask->gt_uniq = uniq;
775 snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
779 mtx_lock(&qgroup->tqg_lock);
780 if (tqg_smp_started) {
781 for (i = 0; i < qgroup->tqg_cnt; i++)
782 if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
787 mtx_unlock(&qgroup->tqg_lock);
788 printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
793 qgroup->tqg_queue[qid].tgc_cnt++;
794 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
795 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
796 cpu = qgroup->tqg_queue[qid].tgc_cpu;
797 mtx_unlock(&qgroup->tqg_lock);
799 if (dev != NULL && irq != NULL && tqg_smp_started) {
800 error = bus_bind_intr(dev, irq, cpu);
802 printf("%s: binding interrupt failed for %s: %d\n",
803 __func__, gtask->gt_name, error);
809 taskqgroup_attach_cpu_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
812 struct resource *irq;
813 int cpu, error, i, qid;
819 MPASS(tqg_smp_started);
820 mtx_lock(&qgroup->tqg_lock);
821 for (i = 0; i < qgroup->tqg_cnt; i++)
822 if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
827 mtx_unlock(&qgroup->tqg_lock);
828 printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
831 qgroup->tqg_queue[qid].tgc_cnt++;
832 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
833 MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
834 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
835 mtx_unlock(&qgroup->tqg_lock);
837 if (dev != NULL && irq != NULL) {
838 error = bus_bind_intr(dev, irq, cpu);
840 printf("%s: binding interrupt failed for %s: %d\n",
841 __func__, gtask->gt_name, error);
847 taskqgroup_detach(struct taskqgroup *qgroup, struct grouptask *gtask)
851 grouptask_block(gtask);
852 mtx_lock(&qgroup->tqg_lock);
853 for (i = 0; i < qgroup->tqg_cnt; i++)
854 if (qgroup->tqg_queue[i].tgc_taskq == gtask->gt_taskqueue)
856 if (i == qgroup->tqg_cnt)
857 panic("%s: task %s not in group", __func__, gtask->gt_name);
858 qgroup->tqg_queue[i].tgc_cnt--;
859 LIST_REMOVE(gtask, gt_list);
860 mtx_unlock(&qgroup->tqg_lock);
861 gtask->gt_taskqueue = NULL;
862 gtask->gt_task.ta_flags &= ~TASK_NOENQUEUE;
866 taskqgroup_binder(void *ctx)
868 struct taskq_bind_task *gtask = (struct taskq_bind_task *)ctx;
873 CPU_SET(gtask->bt_cpuid, &mask);
874 error = cpuset_setthread(curthread->td_tid, &mask);
875 thread_lock(curthread);
876 sched_bind(curthread, gtask->bt_cpuid);
877 thread_unlock(curthread);
880 printf("%s: binding curthread failed: %d\n", __func__, error);
881 free(gtask, M_DEVBUF);
885 taskqgroup_bind(struct taskqgroup *qgroup)
887 struct taskq_bind_task *gtask;
891 * Bind taskqueue threads to specific CPUs, if they have been assigned
894 if (qgroup->tqg_cnt == 1)
897 for (i = 0; i < qgroup->tqg_cnt; i++) {
898 gtask = malloc(sizeof (*gtask), M_DEVBUF, M_WAITOK);
899 GTASK_INIT(>ask->bt_task, 0, 0, taskqgroup_binder, gtask);
900 gtask->bt_cpuid = qgroup->tqg_queue[i].tgc_cpu;
901 grouptaskqueue_enqueue(qgroup->tqg_queue[i].tgc_taskq,
907 taskqgroup_config_init(void *arg)
909 struct taskqgroup *qgroup = qgroup_config;
910 LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
912 LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
914 qgroup->tqg_queue[0].tgc_cnt = 0;
915 taskqgroup_cpu_create(qgroup, 0, 0);
918 qgroup->tqg_stride = 1;
921 SYSINIT(taskqgroup_config_init, SI_SUB_TASKQ, SI_ORDER_SECOND,
922 taskqgroup_config_init, NULL);
925 _taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
927 LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
928 struct grouptask *gtask;
929 int i, k, old_cnt, old_cpu, cpu;
931 mtx_assert(&qgroup->tqg_lock, MA_OWNED);
933 if (cnt < 1 || cnt * stride > mp_ncpus || !tqg_smp_started) {
934 printf("%s: failed cnt: %d stride: %d "
935 "mp_ncpus: %d tqg_smp_started: %d\n",
936 __func__, cnt, stride, mp_ncpus, tqg_smp_started);
939 if (qgroup->tqg_adjusting) {
940 printf("%s failed: adjusting\n", __func__);
943 qgroup->tqg_adjusting = 1;
944 old_cnt = qgroup->tqg_cnt;
947 old_cpu = qgroup->tqg_queue[old_cnt].tgc_cpu;
948 mtx_unlock(&qgroup->tqg_lock);
950 * Set up queue for tasks added before boot.
953 LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
955 qgroup->tqg_queue[0].tgc_cnt = 0;
959 * If new taskq threads have been added.
962 for (i = old_cnt; i < cnt; i++) {
963 taskqgroup_cpu_create(qgroup, i, cpu);
965 for (k = 0; k < stride; k++)
968 mtx_lock(&qgroup->tqg_lock);
969 qgroup->tqg_cnt = cnt;
970 qgroup->tqg_stride = stride;
973 * Adjust drivers to use new taskqs.
975 for (i = 0; i < old_cnt; i++) {
976 while ((gtask = LIST_FIRST(&qgroup->tqg_queue[i].tgc_tasks))) {
977 LIST_REMOVE(gtask, gt_list);
978 qgroup->tqg_queue[i].tgc_cnt--;
979 LIST_INSERT_HEAD(>ask_head, gtask, gt_list);
982 mtx_unlock(&qgroup->tqg_lock);
984 while ((gtask = LIST_FIRST(>ask_head))) {
985 LIST_REMOVE(gtask, gt_list);
986 if (gtask->gt_cpu == -1)
987 taskqgroup_attach_deferred(qgroup, gtask);
988 else if (taskqgroup_attach_cpu_deferred(qgroup, gtask))
989 taskqgroup_attach_deferred(qgroup, gtask);
993 mtx_lock(&qgroup->tqg_lock);
994 for (i = 0; i < qgroup->tqg_cnt; i++) {
995 MPASS(qgroup->tqg_queue[i].tgc_taskq != NULL);
996 LIST_FOREACH(gtask, &qgroup->tqg_queue[i].tgc_tasks, gt_list)
997 MPASS(gtask->gt_taskqueue != NULL);
999 mtx_unlock(&qgroup->tqg_lock);
1002 * If taskq thread count has been reduced.
1004 for (i = cnt; i < old_cnt; i++)
1005 taskqgroup_cpu_remove(qgroup, i);
1007 taskqgroup_bind(qgroup);
1009 mtx_lock(&qgroup->tqg_lock);
1010 qgroup->tqg_adjusting = 0;
1016 taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
1020 mtx_lock(&qgroup->tqg_lock);
1021 error = _taskqgroup_adjust(qgroup, cnt, stride);
1022 mtx_unlock(&qgroup->tqg_lock);
1028 taskqgroup_create(const char *name)
1030 struct taskqgroup *qgroup;
1032 qgroup = malloc(sizeof(*qgroup), M_GTASKQUEUE, M_WAITOK | M_ZERO);
1033 mtx_init(&qgroup->tqg_lock, "taskqgroup", NULL, MTX_DEF);
1034 qgroup->tqg_name = name;
1035 LIST_INIT(&qgroup->tqg_queue[0].tgc_tasks);
1041 taskqgroup_destroy(struct taskqgroup *qgroup)
1047 taskqgroup_config_gtask_init(void *ctx, struct grouptask *gtask, gtask_fn_t *fn,
1051 GROUPTASK_INIT(gtask, 0, fn, ctx);
1052 taskqgroup_attach(qgroup_config, gtask, gtask, NULL, NULL, name);
1056 taskqgroup_config_gtask_deinit(struct grouptask *gtask)
1059 taskqgroup_detach(qgroup_config, gtask);