391 lines
9.3 KiB
C
391 lines
9.3 KiB
C
/*-
|
|
* Copyright (c) 2000 Doug Rabson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/interrupt.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/taskqueue.h>
|
|
#include <sys/unistd.h>
|
|
|
|
static MALLOC_DEFINE(M_TASKQUEUE, "taskqueue", "Task Queues");
|
|
static void *taskqueue_giant_ih;
|
|
static void *taskqueue_ih;
|
|
static STAILQ_HEAD(taskqueue_list, taskqueue) taskqueue_queues;
|
|
static struct mtx taskqueue_queues_mutex;
|
|
static struct proc *taskqueue_thread_proc;
|
|
|
|
struct taskqueue {
|
|
STAILQ_ENTRY(taskqueue) tq_link;
|
|
STAILQ_HEAD(, task) tq_queue;
|
|
const char *tq_name;
|
|
taskqueue_enqueue_fn tq_enqueue;
|
|
void *tq_context;
|
|
int tq_draining;
|
|
struct mtx tq_mutex;
|
|
};
|
|
|
|
static void init_taskqueue_list(void *data);
|
|
|
|
static void
|
|
init_taskqueue_list(void *data __unused)
|
|
{
|
|
|
|
mtx_init(&taskqueue_queues_mutex, "taskqueue list", NULL, MTX_DEF);
|
|
STAILQ_INIT(&taskqueue_queues);
|
|
}
|
|
SYSINIT(taskqueue_list, SI_SUB_INTRINSIC, SI_ORDER_ANY, init_taskqueue_list,
|
|
NULL);
|
|
|
|
struct taskqueue *
|
|
taskqueue_create(const char *name, int mflags,
|
|
taskqueue_enqueue_fn enqueue, void *context)
|
|
{
|
|
struct taskqueue *queue;
|
|
|
|
queue = malloc(sizeof(struct taskqueue), M_TASKQUEUE, mflags | M_ZERO);
|
|
if (!queue)
|
|
return 0;
|
|
|
|
STAILQ_INIT(&queue->tq_queue);
|
|
queue->tq_name = name;
|
|
queue->tq_enqueue = enqueue;
|
|
queue->tq_context = context;
|
|
queue->tq_draining = 0;
|
|
mtx_init(&queue->tq_mutex, "taskqueue", NULL, MTX_DEF);
|
|
|
|
mtx_lock(&taskqueue_queues_mutex);
|
|
STAILQ_INSERT_TAIL(&taskqueue_queues, queue, tq_link);
|
|
mtx_unlock(&taskqueue_queues_mutex);
|
|
|
|
return queue;
|
|
}
|
|
|
|
void
|
|
taskqueue_free(struct taskqueue *queue)
|
|
{
|
|
|
|
mtx_lock(&queue->tq_mutex);
|
|
KASSERT(queue->tq_draining == 0, ("free'ing a draining taskqueue"));
|
|
queue->tq_draining = 1;
|
|
mtx_unlock(&queue->tq_mutex);
|
|
|
|
taskqueue_run(queue);
|
|
|
|
mtx_lock(&taskqueue_queues_mutex);
|
|
STAILQ_REMOVE(&taskqueue_queues, queue, taskqueue, tq_link);
|
|
mtx_unlock(&taskqueue_queues_mutex);
|
|
|
|
mtx_destroy(&queue->tq_mutex);
|
|
free(queue, M_TASKQUEUE);
|
|
}
|
|
|
|
/*
|
|
* Returns with the taskqueue locked.
|
|
*/
|
|
struct taskqueue *
|
|
taskqueue_find(const char *name)
|
|
{
|
|
struct taskqueue *queue;
|
|
|
|
mtx_lock(&taskqueue_queues_mutex);
|
|
STAILQ_FOREACH(queue, &taskqueue_queues, tq_link) {
|
|
mtx_lock(&queue->tq_mutex);
|
|
if (strcmp(queue->tq_name, name) == 0) {
|
|
mtx_unlock(&taskqueue_queues_mutex);
|
|
return queue;
|
|
}
|
|
mtx_unlock(&queue->tq_mutex);
|
|
}
|
|
mtx_unlock(&taskqueue_queues_mutex);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
taskqueue_enqueue(struct taskqueue *queue, struct task *task)
|
|
{
|
|
struct task *ins;
|
|
struct task *prev;
|
|
|
|
mtx_lock(&queue->tq_mutex);
|
|
|
|
/*
|
|
* Don't allow new tasks on a queue which is being freed.
|
|
*/
|
|
if (queue->tq_draining) {
|
|
mtx_unlock(&queue->tq_mutex);
|
|
return EPIPE;
|
|
}
|
|
|
|
/*
|
|
* Count multiple enqueues.
|
|
*/
|
|
if (task->ta_pending) {
|
|
task->ta_pending++;
|
|
mtx_unlock(&queue->tq_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Optimise the case when all tasks have the same priority.
|
|
*/
|
|
prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);
|
|
if (!prev || prev->ta_priority >= task->ta_priority) {
|
|
STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
|
|
} else {
|
|
prev = 0;
|
|
for (ins = STAILQ_FIRST(&queue->tq_queue); ins;
|
|
prev = ins, ins = STAILQ_NEXT(ins, ta_link))
|
|
if (ins->ta_priority < task->ta_priority)
|
|
break;
|
|
|
|
if (prev)
|
|
STAILQ_INSERT_AFTER(&queue->tq_queue, prev, task, ta_link);
|
|
else
|
|
STAILQ_INSERT_HEAD(&queue->tq_queue, task, ta_link);
|
|
}
|
|
|
|
task->ta_pending = 1;
|
|
if (queue->tq_enqueue)
|
|
queue->tq_enqueue(queue->tq_context);
|
|
|
|
mtx_unlock(&queue->tq_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
taskqueue_run(struct taskqueue *queue)
|
|
{
|
|
struct task *task;
|
|
int pending;
|
|
|
|
mtx_lock(&queue->tq_mutex);
|
|
while (STAILQ_FIRST(&queue->tq_queue)) {
|
|
/*
|
|
* Carefully remove the first task from the queue and
|
|
* zero its pending count.
|
|
*/
|
|
task = STAILQ_FIRST(&queue->tq_queue);
|
|
STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
|
|
pending = task->ta_pending;
|
|
task->ta_pending = 0;
|
|
mtx_unlock(&queue->tq_mutex);
|
|
|
|
task->ta_func(task->ta_context, pending);
|
|
|
|
mtx_lock(&queue->tq_mutex);
|
|
}
|
|
mtx_unlock(&queue->tq_mutex);
|
|
}
|
|
|
|
static void
|
|
taskqueue_swi_enqueue(void *context)
|
|
{
|
|
swi_sched(taskqueue_ih, 0);
|
|
}
|
|
|
|
static void
|
|
taskqueue_swi_run(void *dummy)
|
|
{
|
|
taskqueue_run(taskqueue_swi);
|
|
}
|
|
|
|
static void
|
|
taskqueue_swi_giant_enqueue(void *context)
|
|
{
|
|
swi_sched(taskqueue_giant_ih, 0);
|
|
}
|
|
|
|
static void
|
|
taskqueue_swi_giant_run(void *dummy)
|
|
{
|
|
taskqueue_run(taskqueue_swi_giant);
|
|
}
|
|
|
|
static void
|
|
taskqueue_kthread(void *arg)
|
|
{
|
|
struct mtx kthread_mutex;
|
|
|
|
bzero(&kthread_mutex, sizeof(kthread_mutex));
|
|
|
|
mtx_init(&kthread_mutex, "taskqueue kthread", NULL, MTX_DEF);
|
|
|
|
mtx_lock(&kthread_mutex);
|
|
|
|
for (;;) {
|
|
mtx_unlock(&kthread_mutex);
|
|
taskqueue_run(taskqueue_thread);
|
|
mtx_lock(&kthread_mutex);
|
|
msleep(&taskqueue_thread, &kthread_mutex, PWAIT, "tqthr", 0);
|
|
}
|
|
}
|
|
|
|
static void
|
|
taskqueue_thread_enqueue(void *context)
|
|
{
|
|
wakeup(&taskqueue_thread);
|
|
}
|
|
|
|
TASKQUEUE_DEFINE(swi, taskqueue_swi_enqueue, 0,
|
|
swi_add(NULL, "task queue", taskqueue_swi_run, NULL, SWI_TQ,
|
|
INTR_MPSAFE, &taskqueue_ih));
|
|
|
|
TASKQUEUE_DEFINE(swi_giant, taskqueue_swi_giant_enqueue, 0,
|
|
swi_add(NULL, "Giant task queue", taskqueue_swi_giant_run,
|
|
NULL, SWI_TQ_GIANT, 0, &taskqueue_giant_ih));
|
|
|
|
TASKQUEUE_DEFINE(thread, taskqueue_thread_enqueue, 0,
|
|
kthread_create(taskqueue_kthread, NULL,
|
|
&taskqueue_thread_proc, 0, 0, "taskqueue"));
|
|
|
|
int
|
|
taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task)
|
|
{
|
|
struct task *ins;
|
|
struct task *prev;
|
|
|
|
mtx_lock_spin(&queue->tq_mutex);
|
|
|
|
/*
|
|
* Don't allow new tasks on a queue which is being freed.
|
|
*/
|
|
if (queue->tq_draining) {
|
|
mtx_unlock_spin(&queue->tq_mutex);
|
|
return EPIPE;
|
|
}
|
|
|
|
/*
|
|
* Count multiple enqueues.
|
|
*/
|
|
if (task->ta_pending) {
|
|
task->ta_pending++;
|
|
mtx_unlock_spin(&queue->tq_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Optimise the case when all tasks have the same priority.
|
|
*/
|
|
prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);
|
|
if (!prev || prev->ta_priority >= task->ta_priority) {
|
|
STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
|
|
} else {
|
|
prev = 0;
|
|
for (ins = STAILQ_FIRST(&queue->tq_queue); ins;
|
|
prev = ins, ins = STAILQ_NEXT(ins, ta_link))
|
|
if (ins->ta_priority < task->ta_priority)
|
|
break;
|
|
|
|
if (prev)
|
|
STAILQ_INSERT_AFTER(&queue->tq_queue, prev, task, ta_link);
|
|
else
|
|
STAILQ_INSERT_HEAD(&queue->tq_queue, task, ta_link);
|
|
}
|
|
|
|
task->ta_pending = 1;
|
|
if (queue->tq_enqueue)
|
|
queue->tq_enqueue(queue->tq_context);
|
|
|
|
mtx_unlock_spin(&queue->tq_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
taskqueue_run_fast(struct taskqueue *queue)
|
|
{
|
|
struct task *task;
|
|
int pending;
|
|
|
|
mtx_lock_spin(&queue->tq_mutex);
|
|
while (STAILQ_FIRST(&queue->tq_queue)) {
|
|
/*
|
|
* Carefully remove the first task from the queue and
|
|
* zero its pending count.
|
|
*/
|
|
task = STAILQ_FIRST(&queue->tq_queue);
|
|
STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
|
|
pending = task->ta_pending;
|
|
task->ta_pending = 0;
|
|
mtx_unlock_spin(&queue->tq_mutex);
|
|
|
|
task->ta_func(task->ta_context, pending);
|
|
|
|
mtx_lock_spin(&queue->tq_mutex);
|
|
}
|
|
mtx_unlock_spin(&queue->tq_mutex);
|
|
}
|
|
|
|
struct taskqueue *taskqueue_fast;
|
|
static void *taskqueue_fast_ih;
|
|
|
|
static void
|
|
taskqueue_fast_schedule(void *context)
|
|
{
|
|
swi_sched(taskqueue_fast_ih, 0);
|
|
}
|
|
|
|
static void
|
|
taskqueue_fast_run(void *dummy)
|
|
{
|
|
taskqueue_run_fast(taskqueue_fast);
|
|
}
|
|
|
|
static void
|
|
taskqueue_define_fast(void *arg)
|
|
{
|
|
taskqueue_fast = malloc(sizeof(struct taskqueue),
|
|
M_TASKQUEUE, M_NOWAIT | M_ZERO);
|
|
if (!taskqueue_fast) {
|
|
printf("%s: Unable to allocate fast task queue!\n", __func__);
|
|
return;
|
|
}
|
|
|
|
STAILQ_INIT(&taskqueue_fast->tq_queue);
|
|
taskqueue_fast->tq_name = "fast";
|
|
taskqueue_fast->tq_enqueue = taskqueue_fast_schedule;
|
|
mtx_init(&taskqueue_fast->tq_mutex, "taskqueue_fast", NULL, MTX_SPIN);
|
|
|
|
mtx_lock(&taskqueue_queues_mutex);
|
|
STAILQ_INSERT_TAIL(&taskqueue_queues, taskqueue_fast, tq_link);
|
|
mtx_unlock(&taskqueue_queues_mutex);
|
|
|
|
swi_add(NULL, "Fast task queue", taskqueue_fast_run,
|
|
NULL, SWI_TQ_FAST, 0, &taskqueue_fast_ih);
|
|
}
|
|
SYSINIT(taskqueue_fast, SI_SUB_CONFIGURE, SI_ORDER_SECOND,
|
|
taskqueue_define_fast, NULL);
|