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/malloc.h> 39 #include <sys/systimer.h> 40 #include <sys/sysctl.h> 41 #include <sys/signal.h> 42 #include <sys/interrupt.h> 43 #include <sys/bus.h> 44 #include <sys/time.h> 45 #include <sys/event.h> 46 #include <machine/cpu.h> 47 #include <machine/globaldata.h> 48 #include <machine/md_var.h> 49 50 #include <unistd.h> 51 #include <signal.h> 52 #include <stdlib.h> 53 #include <fcntl.h> 54 55 struct kqueue_info { 56 void (*func)(void *, struct intrframe *); 57 void *data; 58 int fd; 59 }; 60 61 static int KQueueFd = -1; 62 63 /* 64 * Initialize kqueue based I/O 65 * 66 * Use SIGIO to get an immediate event when the kqueue has something waiting 67 * for us. Setup the SIGIO signal as a mailbox signal for efficiency. 68 * 69 * Currently only read events are supported. 70 */ 71 void 72 init_kqueue(void) 73 { 74 #if 0 75 struct sigaction sa; 76 bzero(&sa, sizeof(sa)); 77 /*sa.sa_mailbox = &mdcpu->gd_mailbox;*/ 78 sa.sa_flags = 0; 79 sa.sa_handler = kqueuesig; 80 sigemptyset(&sa.sa_mask); 81 sigaction(SIGIO, &sa, NULL); 82 #endif 83 KQueueFd = kqueue(); 84 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0) 85 panic("Cannot configure kqueue for SIGIO, update your kernel"); 86 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0) 87 panic("Cannot configure kqueue for SIGIO, update your kernel"); 88 } 89 90 #if 0 91 /* 92 * Signal handler dispatches interrupt thread. Use interrupt #1 93 */ 94 static void 95 kqueuesig(int signo) 96 { 97 signalintr(1); 98 } 99 100 #endif 101 102 /* 103 * Generic I/O event support 104 */ 105 struct kqueue_info * 106 kqueue_add(int fd, void (*func)(void *, struct intrframe *), void *data) 107 { 108 struct timespec ts = { 0, 0 }; 109 struct kqueue_info *info; 110 struct kevent kev; 111 112 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT); 113 info->func = func; 114 info->data = data; 115 info->fd = fd; 116 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info); 117 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 118 panic("kqueue: kevent() call could not add descriptor"); 119 return(info); 120 } 121 122 #if 0 123 /* 124 * Medium resolution timer support 125 */ 126 struct kqueue_info * 127 kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data) 128 { 129 struct kqueue_info *info; 130 131 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT); 132 info->func = func; 133 info->data = data; 134 info->fd = (uintptr_t)info; 135 136 return(info); 137 } 138 139 void 140 kqueue_reload_timer(struct kqueue_info *info, int ms) 141 { 142 struct timespec ts = { 0, 0 }; 143 struct kevent kev; 144 145 KKASSERT(ms > 0); 146 147 EV_SET(&kev, info->fd, EVFILT_TIMER, 148 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info); 149 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 150 panic("kqueue_reload_timer: Failed"); 151 } 152 #endif 153 154 /* 155 * Destroy a previously added kqueue event 156 */ 157 void 158 kqueue_del(struct kqueue_info *info) 159 { 160 struct timespec ts = { 0, 0 }; 161 struct kevent kev; 162 163 KKASSERT(info->fd >= 0); 164 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL); 165 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0) 166 panic("kevent: failed to delete descriptor %d", info->fd); 167 info->fd = -1; 168 kfree(info, M_DEVBUF); 169 } 170 171 /* 172 * Safely called via DragonFly's normal interrupt handling mechanism. 173 * 174 * Calleld with the MP lock held. Note that this is still an interrupt 175 * thread context. 176 */ 177 void 178 kqueue_intr(struct intrframe *frame) 179 { 180 struct timespec ts; 181 struct kevent kevary[8]; 182 int n; 183 int i; 184 185 ts.tv_sec = 0; 186 ts.tv_nsec = 0; 187 do { 188 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts); 189 for (i = 0; i < n; ++i) { 190 struct kevent *kev = &kevary[i]; 191 struct kqueue_info *info = (void *)kev->udata; 192 193 info->func(info->data, frame); 194 } 195 } while (n == 8); 196 } 197