kernel/platform: Remove some #include duplicates.
[dragonfly.git] / sys / platform / vkernel64 / platform / kqueue.c
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1/*
2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
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
16 * distribution.
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.
20 *
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
32 * SUCH DAMAGE.
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33 */
34
35#include <sys/types.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/systimer.h>
39#include <sys/sysctl.h>
40#include <sys/signal.h>
41#include <sys/interrupt.h>
42#include <sys/bus.h>
43#include <sys/time.h>
44#include <sys/event.h>
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45#include <machine/cpu.h>
46#include <machine/globaldata.h>
47#include <machine/md_var.h>
48
49#include <sys/thread2.h>
50
51#include <unistd.h>
52#include <signal.h>
53#include <stdlib.h>
54#include <fcntl.h>
55
56struct kqueue_info {
57 void (*func)(void *, struct intrframe *);
58 void *data;
59 int fd;
60};
61
62static void kqueuesig(int signo);
63static void kqueue_intr(void *arg __unused, void *frame __unused);
64
65static int KQueueFd = -1;
66static void *VIntr1;
67
68/*
69 * Initialize kqueue based I/O
70 *
71 * Use SIGIO to get an immediate event when the kqueue has something waiting
72 * for us. Setup the SIGIO signal as a mailbox signal for efficiency.
73 *
74 * Currently only read events are supported.
75 */
76void
77init_kqueue(void)
78{
79 struct sigaction sa;
80
81 bzero(&sa, sizeof(sa));
82 /*sa.sa_mailbox = &mdcpu->gd_mailbox;*/
988854f9 83 sa.sa_flags = 0;
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84 sa.sa_handler = kqueuesig;
85 sigemptyset(&sa.sa_mask);
86 sigaction(SIGIO, &sa, NULL);
87 KQueueFd = kqueue();
88 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0)
89 panic("Cannot configure kqueue for SIGIO, update your kernel");
90 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0)
91 panic("Cannot configure kqueue for SIGIO, update your kernel");
92}
93
94/*
95 * Signal handler dispatches interrupt thread. Use interrupt #1
96 */
97static void
98kqueuesig(int signo)
99{
100 signalintr(1);
101}
102
103/*
104 * Generic I/O event support
105 */
106struct kqueue_info *
107kqueue_add(int fd, void (*func)(void *, struct intrframe *), void *data)
108{
109 struct timespec ts = { 0, 0 };
110 struct kqueue_info *info;
111 struct kevent kev;
112
6355d931 113 if (VIntr1 == NULL) {
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114 VIntr1 = register_int_virtual(1, kqueue_intr, NULL, "kqueue",
115 NULL, INTR_MPSAFE);
6355d931 116 }
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117
118 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
119 info->func = func;
120 info->data = data;
121 info->fd = fd;
122 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info);
123 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
124 panic("kqueue: kevent() call could not add descriptor");
125 return(info);
126}
127
128/*
129 * Medium resolution timer support
130 */
131struct kqueue_info *
132kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data)
133{
134 struct kqueue_info *info;
135
6355d931 136 if (VIntr1 == NULL) {
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137 VIntr1 = register_int_virtual(1, kqueue_intr, NULL, "kqueue",
138 NULL, INTR_MPSAFE);
6355d931 139 }
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140
141 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
142 info->func = func;
143 info->data = data;
144 info->fd = (uintptr_t)info;
145 return(info);
146}
147
148void
149kqueue_reload_timer(struct kqueue_info *info, int ms)
150{
151 struct timespec ts = { 0, 0 };
152 struct kevent kev;
153
154 KKASSERT(ms > 0);
155
156 EV_SET(&kev, info->fd, EVFILT_TIMER,
157 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info);
158 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
159 panic("kqueue_reload_timer: Failed");
160}
161
162/*
163 * Destroy a previously added kqueue event
164 */
165void
166kqueue_del(struct kqueue_info *info)
167{
168 struct timespec ts = { 0, 0 };
169 struct kevent kev;
170
171 KKASSERT(info->fd >= 0);
172 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
173 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
174 panic("kevent: failed to delete descriptor %d", info->fd);
175 info->fd = -1;
176 kfree(info, M_DEVBUF);
177}
178
179/*
180 * Safely called via DragonFly's normal interrupt handling mechanism.
181 *
182 * Calleld with the MP lock held. Note that this is still an interrupt
183 * thread context.
184 */
185static
186void
187kqueue_intr(void *arg __unused, void *frame __unused)
188{
189 struct timespec ts;
190 struct kevent kevary[8];
191 int n;
192 int i;
193
194 ts.tv_sec = 0;
195 ts.tv_nsec = 0;
196 do {
197 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts);
198 for (i = 0; i < n; ++i) {
199 struct kevent *kev = &kevary[i];
200 struct kqueue_info *info = (void *)kev->udata;
201
202 info->func(info->data, frame);
203 }
204 } while (n == 8);
205}