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;
62 LIST_ENTRY(gtaskqueue_busy) tb_link;
65 typedef void (*gtaskqueue_enqueue_fn)(void *context);
68 STAILQ_HEAD(, gtask) tq_queue;
69 LIST_HEAD(, gtaskqueue_busy) tq_active;
72 struct mtx_padalign tq_mutex;
73 gtaskqueue_enqueue_fn tq_enqueue;
76 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, const char *wm)
121 return (msleep_spin(p, (struct mtx *)&tq->tq_mutex, wm, 0));
122 return (msleep(p, &tq->tq_mutex, 0, wm, 0));
125 static struct gtaskqueue *
126 _gtaskqueue_create(const char *name, int mflags,
127 taskqueue_enqueue_fn enqueue, void *context,
128 int mtxflags, const char *mtxname __unused)
130 struct gtaskqueue *queue;
133 tq_name = malloc(TASKQUEUE_NAMELEN, M_GTASKQUEUE, mflags | M_ZERO);
137 snprintf(tq_name, TASKQUEUE_NAMELEN, "%s", (name) ? name : "taskqueue");
139 queue = malloc(sizeof(struct gtaskqueue), M_GTASKQUEUE, mflags | M_ZERO);
141 free(tq_name, M_GTASKQUEUE);
145 STAILQ_INIT(&queue->tq_queue);
146 LIST_INIT(&queue->tq_active);
147 queue->tq_enqueue = enqueue;
148 queue->tq_context = context;
149 queue->tq_name = tq_name;
150 queue->tq_spin = (mtxflags & MTX_SPIN) != 0;
151 queue->tq_flags |= TQ_FLAGS_ACTIVE;
152 if (enqueue == gtaskqueue_thread_enqueue)
153 queue->tq_flags |= TQ_FLAGS_UNLOCKED_ENQUEUE;
154 mtx_init(&queue->tq_mutex, tq_name, NULL, mtxflags);
161 * Signal a taskqueue thread to terminate.
164 gtaskqueue_terminate(struct thread **pp, struct gtaskqueue *tq)
167 while (tq->tq_tcount > 0 || tq->tq_callouts > 0) {
169 TQ_SLEEP(tq, pp, "gtq_destroy");
174 gtaskqueue_free(struct gtaskqueue *queue)
178 queue->tq_flags &= ~TQ_FLAGS_ACTIVE;
179 gtaskqueue_terminate(queue->tq_threads, queue);
180 KASSERT(LIST_EMPTY(&queue->tq_active), ("Tasks still running?"));
181 KASSERT(queue->tq_callouts == 0, ("Armed timeout tasks"));
182 mtx_destroy(&queue->tq_mutex);
183 free(queue->tq_threads, M_GTASKQUEUE);
184 free(queue->tq_name, M_GTASKQUEUE);
185 free(queue, M_GTASKQUEUE);
189 * Wait for all to complete, then prevent it from being enqueued
192 grouptask_block(struct grouptask *grouptask)
194 struct gtaskqueue *queue = grouptask->gt_taskqueue;
195 struct gtask *gtask = &grouptask->gt_task;
200 panic("queue == NULL");
204 gtask->ta_flags |= TASK_NOENQUEUE;
205 gtaskqueue_drain_locked(queue, gtask);
210 grouptask_unblock(struct grouptask *grouptask)
212 struct gtaskqueue *queue = grouptask->gt_taskqueue;
213 struct gtask *gtask = &grouptask->gt_task;
218 panic("queue == NULL");
222 gtask->ta_flags &= ~TASK_NOENQUEUE;
227 grouptaskqueue_enqueue(struct gtaskqueue *queue, struct gtask *gtask)
232 panic("queue == NULL");
236 if (gtask->ta_flags & TASK_ENQUEUED) {
240 if (gtask->ta_flags & TASK_NOENQUEUE) {
244 STAILQ_INSERT_TAIL(&queue->tq_queue, gtask, ta_link);
245 gtask->ta_flags |= TASK_ENQUEUED;
247 if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
248 queue->tq_enqueue(queue->tq_context);
253 gtaskqueue_task_nop_fn(void *context)
258 * Block until all currently queued tasks in this taskqueue
259 * have begun execution. Tasks queued during execution of
260 * this function are ignored.
263 gtaskqueue_drain_tq_queue(struct gtaskqueue *queue)
265 struct gtask t_barrier;
267 if (STAILQ_EMPTY(&queue->tq_queue))
271 * Enqueue our barrier after all current tasks, but with
272 * the highest priority so that newly queued tasks cannot
273 * pass it. Because of the high priority, we can not use
274 * taskqueue_enqueue_locked directly (which drops the lock
275 * anyway) so just insert it at tail while we have the
278 GTASK_INIT(&t_barrier, 0, USHRT_MAX, gtaskqueue_task_nop_fn, &t_barrier);
279 STAILQ_INSERT_TAIL(&queue->tq_queue, &t_barrier, ta_link);
280 t_barrier.ta_flags |= TASK_ENQUEUED;
283 * Once the barrier has executed, all previously queued tasks
284 * have completed or are currently executing.
286 while (t_barrier.ta_flags & TASK_ENQUEUED)
287 TQ_SLEEP(queue, &t_barrier, "gtq_qdrain");
291 * Block until all currently executing tasks for this taskqueue
292 * complete. Tasks that begin execution during the execution
293 * of this function are ignored.
296 gtaskqueue_drain_tq_active(struct gtaskqueue *queue)
298 struct gtaskqueue_busy *tb;
301 if (LIST_EMPTY(&queue->tq_active))
304 /* Block taskq_terminate().*/
305 queue->tq_callouts++;
307 /* Wait for any active task with sequence from the past. */
310 LIST_FOREACH(tb, &queue->tq_active, tb_link) {
311 if ((int)(tb->tb_seq - seq) <= 0) {
312 TQ_SLEEP(queue, tb->tb_running, "gtq_adrain");
317 /* Release taskqueue_terminate(). */
318 queue->tq_callouts--;
319 if ((queue->tq_flags & TQ_FLAGS_ACTIVE) == 0)
320 wakeup_one(queue->tq_threads);
324 gtaskqueue_block(struct gtaskqueue *queue)
328 queue->tq_flags |= TQ_FLAGS_BLOCKED;
333 gtaskqueue_unblock(struct gtaskqueue *queue)
337 queue->tq_flags &= ~TQ_FLAGS_BLOCKED;
338 if (!STAILQ_EMPTY(&queue->tq_queue))
339 queue->tq_enqueue(queue->tq_context);
344 gtaskqueue_run_locked(struct gtaskqueue *queue)
346 struct gtaskqueue_busy tb;
349 KASSERT(queue != NULL, ("tq is NULL"));
350 TQ_ASSERT_LOCKED(queue);
351 tb.tb_running = NULL;
352 LIST_INSERT_HEAD(&queue->tq_active, &tb, tb_link);
354 while ((gtask = STAILQ_FIRST(&queue->tq_queue)) != NULL) {
355 STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
356 gtask->ta_flags &= ~TASK_ENQUEUED;
357 tb.tb_running = gtask;
358 tb.tb_seq = ++queue->tq_seq;
361 KASSERT(gtask->ta_func != NULL, ("task->ta_func is NULL"));
362 gtask->ta_func(gtask->ta_context);
367 LIST_REMOVE(&tb, tb_link);
371 task_is_running(struct gtaskqueue *queue, struct gtask *gtask)
373 struct gtaskqueue_busy *tb;
375 TQ_ASSERT_LOCKED(queue);
376 LIST_FOREACH(tb, &queue->tq_active, tb_link) {
377 if (tb->tb_running == gtask)
384 gtaskqueue_cancel_locked(struct gtaskqueue *queue, struct gtask *gtask)
387 if (gtask->ta_flags & TASK_ENQUEUED)
388 STAILQ_REMOVE(&queue->tq_queue, gtask, gtask, ta_link);
389 gtask->ta_flags &= ~TASK_ENQUEUED;
390 return (task_is_running(queue, gtask) ? EBUSY : 0);
394 gtaskqueue_cancel(struct gtaskqueue *queue, struct gtask *gtask)
399 error = gtaskqueue_cancel_locked(queue, gtask);
406 gtaskqueue_drain_locked(struct gtaskqueue *queue, struct gtask *gtask)
408 while ((gtask->ta_flags & TASK_ENQUEUED) || task_is_running(queue, gtask))
409 TQ_SLEEP(queue, gtask, "gtq_drain");
413 gtaskqueue_drain(struct gtaskqueue *queue, struct gtask *gtask)
417 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
420 gtaskqueue_drain_locked(queue, gtask);
425 gtaskqueue_drain_all(struct gtaskqueue *queue)
429 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
432 gtaskqueue_drain_tq_queue(queue);
433 gtaskqueue_drain_tq_active(queue);
438 _gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
439 cpuset_t *mask, const char *name, va_list ap)
441 char ktname[MAXCOMLEN + 1];
443 struct gtaskqueue *tq;
449 vsnprintf(ktname, sizeof(ktname), name, ap);
452 tq->tq_threads = malloc(sizeof(struct thread *) * count, M_GTASKQUEUE,
454 if (tq->tq_threads == NULL) {
455 printf("%s: no memory for %s threads\n", __func__, ktname);
459 for (i = 0; i < count; i++) {
461 error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
462 &tq->tq_threads[i], RFSTOPPED, 0, "%s", ktname);
464 error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
465 &tq->tq_threads[i], RFSTOPPED, 0,
468 /* should be ok to continue, taskqueue_free will dtrt */
469 printf("%s: kthread_add(%s): error %d", __func__,
471 tq->tq_threads[i] = NULL; /* paranoid */
475 for (i = 0; i < count; i++) {
476 if (tq->tq_threads[i] == NULL)
478 td = tq->tq_threads[i];
480 error = cpuset_setthread(td->td_tid, mask);
482 * Failing to pin is rarely an actual fatal error;
483 * it'll just affect performance.
486 printf("%s: curthread=%llu: can't pin; "
489 (unsigned long long) td->td_tid,
494 sched_add(td, SRQ_BORING);
501 gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
502 const char *name, ...)
508 error = _gtaskqueue_start_threads(tqp, count, pri, NULL, name, ap);
514 gtaskqueue_run_callback(struct gtaskqueue *tq,
515 enum taskqueue_callback_type cb_type)
517 taskqueue_callback_fn tq_callback;
519 TQ_ASSERT_UNLOCKED(tq);
520 tq_callback = tq->tq_callbacks[cb_type];
521 if (tq_callback != NULL)
522 tq_callback(tq->tq_cb_contexts[cb_type]);
526 gtaskqueue_thread_loop(void *arg)
528 struct gtaskqueue **tqp, *tq;
532 gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_INIT);
534 while ((tq->tq_flags & TQ_FLAGS_ACTIVE) != 0) {
536 gtaskqueue_run_locked(tq);
538 * Because taskqueue_run() can drop tq_mutex, we need to
539 * check if the TQ_FLAGS_ACTIVE flag wasn't removed in the
540 * meantime, which means we missed a wakeup.
542 if ((tq->tq_flags & TQ_FLAGS_ACTIVE) == 0)
544 TQ_SLEEP(tq, tq, "-");
546 gtaskqueue_run_locked(tq);
548 * This thread is on its way out, so just drop the lock temporarily
549 * in order to call the shutdown callback. This allows the callback
550 * to look at the taskqueue, even just before it dies.
553 gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_SHUTDOWN);
556 /* rendezvous with thread that asked us to terminate */
558 wakeup_one(tq->tq_threads);
564 gtaskqueue_thread_enqueue(void *context)
566 struct gtaskqueue **tqp, *tq;
574 static struct gtaskqueue *
575 gtaskqueue_create_fast(const char *name, int mflags,
576 taskqueue_enqueue_fn enqueue, void *context)
578 return _gtaskqueue_create(name, mflags, enqueue, context,
579 MTX_SPIN, "fast_taskqueue");
583 struct taskqgroup_cpu {
584 LIST_HEAD(, grouptask) tgc_tasks;
585 struct gtaskqueue *tgc_taskq;
591 struct taskqgroup_cpu tqg_queue[MAXCPU];
593 const char * tqg_name;
599 struct taskq_bind_task {
600 struct gtask bt_task;
605 taskqgroup_cpu_create(struct taskqgroup *qgroup, int idx, int cpu)
607 struct taskqgroup_cpu *qcpu;
609 qcpu = &qgroup->tqg_queue[idx];
610 LIST_INIT(&qcpu->tgc_tasks);
611 qcpu->tgc_taskq = gtaskqueue_create_fast(NULL, M_WAITOK,
612 taskqueue_thread_enqueue, &qcpu->tgc_taskq);
613 gtaskqueue_start_threads(&qcpu->tgc_taskq, 1, PI_SOFT,
614 "%s_%d", qgroup->tqg_name, idx);
619 taskqgroup_cpu_remove(struct taskqgroup *qgroup, int idx)
622 gtaskqueue_free(qgroup->tqg_queue[idx].tgc_taskq);
626 * Find the taskq with least # of tasks that doesn't currently have any
627 * other queues from the uniq identifier.
630 taskqgroup_find(struct taskqgroup *qgroup, void *uniq)
636 mtx_assert(&qgroup->tqg_lock, MA_OWNED);
637 if (qgroup->tqg_cnt == 0)
642 * Two passes; First scan for a queue with the least tasks that
643 * does not already service this uniq id. If that fails simply find
644 * the queue with the least total tasks;
646 for (strict = 1; mincnt == INT_MAX; strict = 0) {
647 for (i = 0; i < qgroup->tqg_cnt; i++) {
648 if (qgroup->tqg_queue[i].tgc_cnt > mincnt)
652 &qgroup->tqg_queue[i].tgc_tasks, gt_list)
653 if (n->gt_uniq == uniq)
658 mincnt = qgroup->tqg_queue[i].tgc_cnt;
663 panic("%s: failed to pick a qid.", __func__);
669 * smp_started is unusable since it is not set for UP kernels or even for
670 * SMP kernels when there is 1 CPU. This is usually handled by adding a
671 * (mp_ncpus == 1) test, but that would be broken here since we need to
672 * to synchronize with the SI_SUB_SMP ordering. Even in the pure SMP case
673 * smp_started only gives a fuzzy ordering relative to SI_SUB_SMP.
675 * So maintain our own flag. It must be set after all CPUs are started
676 * and before SI_SUB_SMP:SI_ORDER_ANY so that the SYSINIT for delayed
677 * adjustment is properly delayed. SI_ORDER_FOURTH is clearly before
678 * SI_ORDER_ANY and unclearly after the CPUs are started. It would be
679 * simpler for adjustment to pass a flag indicating if it is delayed.
682 static int tqg_smp_started;
685 tqg_record_smp_started(void *arg)
690 SYSINIT(tqg_record_smp_started, SI_SUB_SMP, SI_ORDER_FOURTH,
691 tqg_record_smp_started, NULL);
694 taskqgroup_attach(struct taskqgroup *qgroup, struct grouptask *gtask,
695 void *uniq, device_t dev, struct resource *irq, const char *name)
699 gtask->gt_uniq = uniq;
700 snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
704 mtx_lock(&qgroup->tqg_lock);
705 qid = taskqgroup_find(qgroup, uniq);
706 qgroup->tqg_queue[qid].tgc_cnt++;
707 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
708 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
709 if (dev != NULL && irq != NULL && tqg_smp_started) {
710 cpu = qgroup->tqg_queue[qid].tgc_cpu;
712 mtx_unlock(&qgroup->tqg_lock);
713 error = bus_bind_intr(dev, irq, cpu);
715 printf("%s: binding interrupt failed for %s: %d\n",
716 __func__, gtask->gt_name, error);
718 mtx_unlock(&qgroup->tqg_lock);
722 taskqgroup_attach_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
726 mtx_lock(&qgroup->tqg_lock);
727 qid = taskqgroup_find(qgroup, gtask->gt_uniq);
728 cpu = qgroup->tqg_queue[qid].tgc_cpu;
729 if (gtask->gt_dev != NULL && gtask->gt_irq != NULL) {
730 mtx_unlock(&qgroup->tqg_lock);
731 error = bus_bind_intr(gtask->gt_dev, gtask->gt_irq, cpu);
732 mtx_lock(&qgroup->tqg_lock);
734 printf("%s: binding interrupt failed for %s: %d\n",
735 __func__, gtask->gt_name, error);
738 qgroup->tqg_queue[qid].tgc_cnt++;
739 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
740 MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
741 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
742 mtx_unlock(&qgroup->tqg_lock);
746 taskqgroup_attach_cpu(struct taskqgroup *qgroup, struct grouptask *gtask,
747 void *uniq, int cpu, device_t dev, struct resource *irq, const char *name)
752 gtask->gt_uniq = uniq;
753 snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
757 mtx_lock(&qgroup->tqg_lock);
758 if (tqg_smp_started) {
759 for (i = 0; i < qgroup->tqg_cnt; i++)
760 if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
765 mtx_unlock(&qgroup->tqg_lock);
766 printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
771 qgroup->tqg_queue[qid].tgc_cnt++;
772 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
773 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
774 cpu = qgroup->tqg_queue[qid].tgc_cpu;
775 mtx_unlock(&qgroup->tqg_lock);
777 if (dev != NULL && irq != NULL && tqg_smp_started) {
778 error = bus_bind_intr(dev, irq, cpu);
780 printf("%s: binding interrupt failed for %s: %d\n",
781 __func__, gtask->gt_name, error);
787 taskqgroup_attach_cpu_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
790 struct resource *irq;
791 int cpu, error, i, qid;
797 MPASS(tqg_smp_started);
798 mtx_lock(&qgroup->tqg_lock);
799 for (i = 0; i < qgroup->tqg_cnt; i++)
800 if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
805 mtx_unlock(&qgroup->tqg_lock);
806 printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
809 qgroup->tqg_queue[qid].tgc_cnt++;
810 LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
811 MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
812 gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
813 mtx_unlock(&qgroup->tqg_lock);
815 if (dev != NULL && irq != NULL) {
816 error = bus_bind_intr(dev, irq, cpu);
818 printf("%s: binding interrupt failed for %s: %d\n",
819 __func__, gtask->gt_name, error);
825 taskqgroup_detach(struct taskqgroup *qgroup, struct grouptask *gtask)
829 grouptask_block(gtask);
830 mtx_lock(&qgroup->tqg_lock);
831 for (i = 0; i < qgroup->tqg_cnt; i++)
832 if (qgroup->tqg_queue[i].tgc_taskq == gtask->gt_taskqueue)
834 if (i == qgroup->tqg_cnt)
835 panic("%s: task %s not in group", __func__, gtask->gt_name);
836 qgroup->tqg_queue[i].tgc_cnt--;
837 LIST_REMOVE(gtask, gt_list);
838 mtx_unlock(&qgroup->tqg_lock);
839 gtask->gt_taskqueue = NULL;
840 gtask->gt_task.ta_flags &= ~TASK_NOENQUEUE;
844 taskqgroup_binder(void *ctx)
846 struct taskq_bind_task *gtask = (struct taskq_bind_task *)ctx;
851 CPU_SET(gtask->bt_cpuid, &mask);
852 error = cpuset_setthread(curthread->td_tid, &mask);
853 thread_lock(curthread);
854 sched_bind(curthread, gtask->bt_cpuid);
855 thread_unlock(curthread);
858 printf("%s: binding curthread failed: %d\n", __func__, error);
859 free(gtask, M_DEVBUF);
863 taskqgroup_bind(struct taskqgroup *qgroup)
865 struct taskq_bind_task *gtask;
869 * Bind taskqueue threads to specific CPUs, if they have been assigned
872 if (qgroup->tqg_cnt == 1)
875 for (i = 0; i < qgroup->tqg_cnt; i++) {
876 gtask = malloc(sizeof (*gtask), M_DEVBUF, M_WAITOK);
877 GTASK_INIT(>ask->bt_task, 0, 0, taskqgroup_binder, gtask);
878 gtask->bt_cpuid = qgroup->tqg_queue[i].tgc_cpu;
879 grouptaskqueue_enqueue(qgroup->tqg_queue[i].tgc_taskq,
885 taskqgroup_config_init(void *arg)
887 struct taskqgroup *qgroup = qgroup_config;
888 LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
890 LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
892 qgroup->tqg_queue[0].tgc_cnt = 0;
893 taskqgroup_cpu_create(qgroup, 0, 0);
896 qgroup->tqg_stride = 1;
899 SYSINIT(taskqgroup_config_init, SI_SUB_TASKQ, SI_ORDER_SECOND,
900 taskqgroup_config_init, NULL);
903 _taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
905 LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
906 struct grouptask *gtask;
907 int i, k, old_cnt, old_cpu, cpu;
909 mtx_assert(&qgroup->tqg_lock, MA_OWNED);
911 if (cnt < 1 || cnt * stride > mp_ncpus || !tqg_smp_started) {
912 printf("%s: failed cnt: %d stride: %d "
913 "mp_ncpus: %d tqg_smp_started: %d\n",
914 __func__, cnt, stride, mp_ncpus, tqg_smp_started);
917 if (qgroup->tqg_adjusting) {
918 printf("%s failed: adjusting\n", __func__);
921 qgroup->tqg_adjusting = 1;
922 old_cnt = qgroup->tqg_cnt;
925 old_cpu = qgroup->tqg_queue[old_cnt].tgc_cpu;
926 mtx_unlock(&qgroup->tqg_lock);
928 * Set up queue for tasks added before boot.
931 LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
933 qgroup->tqg_queue[0].tgc_cnt = 0;
937 * If new taskq threads have been added.
940 for (i = old_cnt; i < cnt; i++) {
941 taskqgroup_cpu_create(qgroup, i, cpu);
943 for (k = 0; k < stride; k++)
946 mtx_lock(&qgroup->tqg_lock);
947 qgroup->tqg_cnt = cnt;
948 qgroup->tqg_stride = stride;
951 * Adjust drivers to use new taskqs.
953 for (i = 0; i < old_cnt; i++) {
954 while ((gtask = LIST_FIRST(&qgroup->tqg_queue[i].tgc_tasks))) {
955 LIST_REMOVE(gtask, gt_list);
956 qgroup->tqg_queue[i].tgc_cnt--;
957 LIST_INSERT_HEAD(>ask_head, gtask, gt_list);
960 mtx_unlock(&qgroup->tqg_lock);
962 while ((gtask = LIST_FIRST(>ask_head))) {
963 LIST_REMOVE(gtask, gt_list);
964 if (gtask->gt_cpu == -1)
965 taskqgroup_attach_deferred(qgroup, gtask);
966 else if (taskqgroup_attach_cpu_deferred(qgroup, gtask))
967 taskqgroup_attach_deferred(qgroup, gtask);
971 mtx_lock(&qgroup->tqg_lock);
972 for (i = 0; i < qgroup->tqg_cnt; i++) {
973 MPASS(qgroup->tqg_queue[i].tgc_taskq != NULL);
974 LIST_FOREACH(gtask, &qgroup->tqg_queue[i].tgc_tasks, gt_list)
975 MPASS(gtask->gt_taskqueue != NULL);
977 mtx_unlock(&qgroup->tqg_lock);
980 * If taskq thread count has been reduced.
982 for (i = cnt; i < old_cnt; i++)
983 taskqgroup_cpu_remove(qgroup, i);
985 taskqgroup_bind(qgroup);
987 mtx_lock(&qgroup->tqg_lock);
988 qgroup->tqg_adjusting = 0;
994 taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
998 mtx_lock(&qgroup->tqg_lock);
999 error = _taskqgroup_adjust(qgroup, cnt, stride);
1000 mtx_unlock(&qgroup->tqg_lock);
1006 taskqgroup_create(const char *name)
1008 struct taskqgroup *qgroup;
1010 qgroup = malloc(sizeof(*qgroup), M_GTASKQUEUE, M_WAITOK | M_ZERO);
1011 mtx_init(&qgroup->tqg_lock, "taskqgroup", NULL, MTX_DEF);
1012 qgroup->tqg_name = name;
1013 LIST_INIT(&qgroup->tqg_queue[0].tgc_tasks);
1019 taskqgroup_destroy(struct taskqgroup *qgroup)
1025 taskqgroup_config_gtask_init(void *ctx, struct grouptask *gtask, gtask_fn_t *fn,
1029 GROUPTASK_INIT(gtask, 0, fn, ctx);
1030 taskqgroup_attach(qgroup_config, gtask, gtask, NULL, NULL, name);
1034 taskqgroup_config_gtask_deinit(struct grouptask *gtask)
1037 taskqgroup_detach(qgroup_config, gtask);