sys/platform/vkernel64/platform/kqueue.c

   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 }