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 1.6 2007/07/02 03:44:12 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 *);
65 static void kqueuesig(int signo);
66 static void kqueue_intr(void *arg __unused, void *frame __unused);
68 static int KQueueFd = -1;
72 * Initialize kqueue based I/O
74 * Use SIGIO to get an immediate event when the kqueue has something waiting
75 * for us. Setup the SIGIO signal as a mailbox signal for efficiency.
77 * Currently only read events are supported.
84 bzero(&sa, sizeof(sa));
85 /*sa.sa_mailbox = &mdcpu->gd_mailbox;*/
86 sa.sa_flags = SA_NODEFER;
87 sa.sa_handler = kqueuesig;
88 sigemptyset(&sa.sa_mask);
89 sigaction(SIGIO, &sa, NULL);
91 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0)
92 panic("Cannot configure kqueue for SIGIO, update your kernel");
93 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0)
94 panic("Cannot configure kqueue for SIGIO, update your kernel");
98 * Signal handler dispatches interrupt thread. Use interrupt #1
107 * Generic I/O event support
110 kqueue_add(int fd, void (*func)(void *, struct intrframe *), void *data)
112 struct timespec ts = { 0, 0 };
113 struct kqueue_info *info;
117 VIntr1 = register_int(1, kqueue_intr, NULL, "kqueue", NULL,
120 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
124 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info);
125 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
126 panic("kqueue: kevent() call could not add descriptor");
131 * Medium resolution timer support
134 kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data)
136 struct kqueue_info *info;
139 VIntr1 = register_int(1, kqueue_intr, NULL, "kqueue", NULL,
142 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
145 info->fd = (uintptr_t)info;
150 kqueue_reload_timer(struct kqueue_info *info, int ms)
152 struct timespec ts = { 0, 0 };
157 EV_SET(&kev, info->fd, EVFILT_TIMER,
158 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info);
159 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
160 panic("kqueue_reload_timer: Failed");
164 * Destroy a previously added kqueue event
167 kqueue_del(struct kqueue_info *info)
169 struct timespec ts = { 0, 0 };
172 KKASSERT(info->fd >= 0);
173 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
174 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
175 panic("kevent: failed to delete descriptor %d", info->fd);
177 kfree(info, M_DEVBUF);
181 * Safely called via DragonFly's normal interrupt handling mechanism.
183 * Calleld with the MP lock held. Note that this is still an interrupt
188 kqueue_intr(void *arg __unused, void *frame __unused)
191 struct kevent kevary[8];
198 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts);
199 for (i = 0; i < n; ++i) {
200 struct kevent *kev = &kevary[i];
201 struct kqueue_info *info = (void *)kev->udata;
203 info->func(info->data, frame);