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. 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> 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 56 struct kqueue_info { 57 void (*func)(void *, struct intrframe *); 58 void *data; 59 int fd; 60 }; 61 62 static int KQueueFd = -1; 63 64 /* 65 * Initialize kqueue based I/O 66 * 67 * Use SIGIO to get an immediate event when the kqueue has something waiting 68 * for us. Setup the SIGIO signal as a mailbox signal for efficiency. 69 * 70 * Currently only read events are supported. 71 */ 72 void 73 init_kqueue(void) 74 { 75 #if 0 76 struct sigaction sa; 77 bzero(&sa, sizeof(sa)); 78 /*sa.sa_mailbox = &mdcpu->gd_mailbox;*/ 79 sa.sa_flags = 0; 80 sa.sa_handler = kqueuesig; 81 sigemptyset(&sa.sa_mask); 82 sigaction(SIGIO, &sa, NULL); 83 #endif 84 KQueueFd = kqueue(); 85 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0) 86 panic("Cannot configure kqueue for SIGIO, update your kernel"); 87 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0) 88 panic("Cannot configure kqueue for SIGIO, update your kernel"); 89 } 90 91 #if 0 92 /* 93 * Signal handler dispatches interrupt thread. Use interrupt #1 94 */ 95 static void 96 kqueuesig(int signo) 97 { 98 signalintr(1); 99 } 100 101 #endif 102 103 /* 104 * Generic I/O event support 105 */ 106 struct kqueue_info * 107 kqueue_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; 112 113 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT); 114 info->func = func; 115 info->data = data; 116 info->fd = fd; 117 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info); 118 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 119 panic("kqueue: kevent() call could not add descriptor"); 120 return(info); 121 } 122 123 #if 0 124 /* 125 * Medium resolution timer support 126 */ 127 struct kqueue_info * 128 kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data) 129 { 130 struct kqueue_info *info; 131 132 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT); 133 info->func = func; 134 info->data = data; 135 info->fd = (uintptr_t)info; 136 137 return(info); 138 } 139 140 void 141 kqueue_reload_timer(struct kqueue_info *info, int ms) 142 { 143 struct timespec ts = { 0, 0 }; 144 struct kevent kev; 145 146 KKASSERT(ms > 0); 147 148 EV_SET(&kev, info->fd, EVFILT_TIMER, 149 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info); 150 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 151 panic("kqueue_reload_timer: Failed"); 152 } 153 #endif 154 155 /* 156 * Destroy a previously added kqueue event 157 */ 158 void 159 kqueue_del(struct kqueue_info *info) 160 { 161 struct timespec ts = { 0, 0 }; 162 struct kevent kev; 163 164 KKASSERT(info->fd >= 0); 165 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL); 166 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 167 panic("kevent: failed to delete descriptor %d", info->fd); 168 info->fd = -1; 169 kfree(info, M_DEVBUF); 170 } 171 172 /* 173 * Safely called via DragonFly's normal interrupt handling mechanism. 174 * 175 * Calleld with the MP lock held. Note that this is still an interrupt 176 * thread context. 177 */ 178 void 179 kqueue_intr(struct intrframe *frame) 180 { 181 struct timespec ts; 182 struct kevent kevary[8]; 183 int n; 184 int i; 185 186 ts.tv_sec = 0; 187 ts.tv_nsec = 0; 188 do { 189 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts); 190 for (i = 0; i < n; ++i) { 191 struct kevent *kev = &kevary[i]; 192 struct kqueue_info *info = (void *)kev->udata; 193 194 info->func(info->data, frame); 195 } 196 } while (n == 8); 197 } 198