2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/platform/vkernel/platform/kqueue.c,v 1.4 2007/06/17 16:46:17 dillon Exp $
37 #include <sys/types.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/systimer.h>
41 #include <sys/sysctl.h>
42 #include <sys/signal.h>
43 #include <sys/interrupt.h>
46 #include <sys/event.h>
48 #include <machine/cpu.h>
49 #include <machine/globaldata.h>
50 #include <machine/md_var.h>
52 #include <sys/thread2.h>
60 void (*func)(void *, struct intrframe *);
68 * Initialize kqueue based I/O
70 * Use SIGIO to get an immediate event when the kqueue has something waiting
71 * for us. Setup the SIGIO signal as a mailbox signal for efficiency.
73 * Currently only read events are supported.
80 bzero(&sa, sizeof(sa));
81 sa.sa_mailbox = &mdcpu->gd_mailbox;
82 sa.sa_flags = SA_MAILBOX | SA_NODEFER;
83 sigemptyset(&sa.sa_mask);
84 sigaction(SIGIO, &sa, NULL);
86 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0)
87 panic("Cannot configure kqueue for SIGIO, update your kernel");
88 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0)
89 panic("Cannot configure kqueue for SIGIO, update your kernel");
93 * A SIGIO mailbox event cause a system call interruption and a timely
94 * poll. If the mailbox is active we clean out all pending kqueue events.
95 * It is really that simple.
97 * We specify EV_CLEAR for all events to ensure no requeues before their
98 * time. A new SIGIO is not generated unless all events are cleared from
102 signalmailbox(struct intrframe *frame)
104 struct mdglobaldata *gd = mdcpu;
106 struct kevent kevary[8];
111 * we only need to wake up our shutdown thread once.
112 * Keep it non-zero so the shutdown thread can detect it.
115 if (mdcpu->gd_shutdown > 0) {
116 mdcpu->gd_shutdown = -1;
117 wakeup(&mdcpu->gd_shutdown);
120 if (gd->gd_mailbox == 0)
127 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts);
128 for (i = 0; i < n; ++i) {
129 struct kevent *kev = &kevary[i];
130 struct kqueue_info *info = (void *)kev->udata;
132 info->func(info->data, frame);
139 * Generic I/O event support
142 kqueue_add(int fd, void (*func)(void *, struct intrframe *), void *data)
144 struct timespec ts = { 0, 0 };
145 struct kqueue_info *info;
148 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
152 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info);
153 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
154 panic("kqueue: kevent() call could not add descriptor");
159 * Medium resolution timer support
162 kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data)
164 struct kqueue_info *info;
166 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
169 info->fd = (uintptr_t)info;
174 kqueue_reload_timer(struct kqueue_info *info, int ms)
176 struct timespec ts = { 0, 0 };
181 EV_SET(&kev, info->fd, EVFILT_TIMER,
182 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info);
183 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
184 panic("kqueue_reload_timer: Failed");
188 * Destroy a previously added kqueue event
191 kqueue_del(struct kqueue_info *info)
193 struct timespec ts = { 0, 0 };
196 KKASSERT(info->fd >= 0);
197 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
198 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
199 panic("kevent: failed to delete descriptor %d", info->fd);
201 kfree(info, M_DEVBUF);