393 lines
11 KiB
C
393 lines
11 KiB
C
/* $NetBSD: wsevent.c,v 1.27 2008/04/28 20:24:01 martin Exp $ */
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/*-
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* Copyright (c) 2006, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)event.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Internal "wscons_event" queue interface for the keyboard and mouse drivers.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: wsevent.c,v 1.27 2008/04/28 20:24:01 martin Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/select.h>
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#include <sys/poll.h>
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#include <dev/wscons/wsconsio.h>
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#include <dev/wscons/wseventvar.h>
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/*
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* Size of a wsevent queue (measured in number of events).
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* Should be a power of two so that `%' is fast.
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* At the moment, the value below makes the queues use 2 Kbytes each; this
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* value may need tuning.
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*/
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#define WSEVENT_QSIZE 256
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/*
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* Priority of code managing wsevent queues. PWSEVENT is set just above
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* PSOCK, which is just above TTIPRI, on the theory that mouse and keyboard
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* `user' input should be quick.
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*/
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#define PWSEVENT 23
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#define splwsevent() spltty()
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static void wsevent_intr(void *);
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/*
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* Initialize a wscons_event queue.
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*/
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void
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wsevent_init(struct wseventvar *ev, struct proc *p)
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{
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if (ev->q != NULL) {
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#ifdef DIAGNOSTIC
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printf("wsevent_init: already init\n");
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#endif
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return;
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}
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ev->get = ev->put = 0;
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ev->q = malloc((u_long)WSEVENT_QSIZE * sizeof(struct wscons_event),
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M_DEVBUF, M_WAITOK|M_ZERO);
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selinit(&ev->sel);
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ev->io = p;
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ev->sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK,
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wsevent_intr, ev);
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}
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/*
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* Tear down a wscons_event queue.
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*/
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void
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wsevent_fini(struct wseventvar *ev)
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{
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if (ev->q == NULL) {
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#ifdef DIAGNOSTIC
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printf("wsevent_fini: already fini\n");
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#endif
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return;
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}
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seldestroy(&ev->sel);
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free(ev->q, M_DEVBUF);
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ev->q = NULL;
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softint_disestablish(ev->sih);
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}
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/*
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* User-level interface: read, poll.
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* (User cannot write an event queue.)
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*/
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int
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wsevent_read(struct wseventvar *ev, struct uio *uio, int flags)
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{
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int s, n, cnt, error;
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/*
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* Make sure we can return at least 1.
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*/
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if (uio->uio_resid < sizeof(struct wscons_event))
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return (EMSGSIZE); /* ??? */
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s = splwsevent();
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while (ev->get == ev->put) {
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if (flags & IO_NDELAY) {
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splx(s);
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return (EWOULDBLOCK);
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}
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ev->wanted = 1;
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error = tsleep(ev, PWSEVENT | PCATCH,
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"wsevent_read", 0);
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if (error) {
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splx(s);
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return (error);
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}
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}
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/*
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* Move wscons_event from tail end of queue (there is at least one
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* there).
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*/
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if (ev->put < ev->get)
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cnt = WSEVENT_QSIZE - ev->get; /* events in [get..QSIZE) */
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else
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cnt = ev->put - ev->get; /* events in [get..put) */
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splx(s);
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n = howmany(uio->uio_resid, sizeof(struct wscons_event));
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if (cnt > n)
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cnt = n;
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error = uiomove(&ev->q[ev->get],
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cnt * sizeof(struct wscons_event), uio);
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n -= cnt;
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/*
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* If we do not wrap to 0, used up all our space, or had an error,
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* stop. Otherwise move from front of queue to put index, if there
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* is anything there to move.
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*/
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if ((ev->get = (ev->get + cnt) % WSEVENT_QSIZE) != 0 ||
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n == 0 || error || (cnt = ev->put) == 0)
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return (error);
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if (cnt > n)
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cnt = n;
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error = uiomove(&ev->q[0],
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cnt * sizeof(struct wscons_event), uio);
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ev->get = cnt;
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return (error);
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}
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int
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wsevent_poll(struct wseventvar *ev, int events, struct lwp *l)
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{
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int revents = 0;
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int s = splwsevent();
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if (events & (POLLIN | POLLRDNORM)) {
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if (ev->get != ev->put)
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(l, &ev->sel);
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}
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splx(s);
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return (revents);
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}
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static void
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filt_wseventrdetach(struct knote *kn)
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{
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struct wseventvar *ev = kn->kn_hook;
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int s;
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s = splwsevent();
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SLIST_REMOVE(&ev->sel.sel_klist, kn, knote, kn_selnext);
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splx(s);
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}
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static int
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filt_wseventread(struct knote *kn, long hint)
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{
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struct wseventvar *ev = kn->kn_hook;
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if (ev->get == ev->put)
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return (0);
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if (ev->get < ev->put)
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kn->kn_data = ev->put - ev->get;
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else
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kn->kn_data = (WSEVENT_QSIZE - ev->get) +
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ev->put;
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kn->kn_data *= sizeof(struct wscons_event);
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return (1);
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}
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static const struct filterops wsevent_filtops =
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{ 1, NULL, filt_wseventrdetach, filt_wseventread };
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int
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wsevent_kqfilter(struct wseventvar *ev, struct knote *kn)
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{
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struct klist *klist;
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int s;
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switch (kn->kn_filter) {
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case EVFILT_READ:
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klist = &ev->sel.sel_klist;
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kn->kn_fop = &wsevent_filtops;
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break;
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default:
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return (EINVAL);
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}
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kn->kn_hook = ev;
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s = splwsevent();
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SLIST_INSERT_HEAD(klist, kn, kn_selnext);
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splx(s);
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return (0);
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}
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/*
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* Wakes up all listener of the 'ev' queue.
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*/
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void
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wsevent_wakeup(struct wseventvar *ev)
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{
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selnotify(&ev->sel, 0, 0);
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if (ev->wanted) {
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ev->wanted = 0;
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wakeup(ev);
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}
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if (ev->async) {
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softint_schedule(ev->sih);
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}
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}
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/*
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* Soft interrupt handler: sends signal to async proc.
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*/
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static void
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wsevent_intr(void *cookie)
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{
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struct wseventvar *ev;
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ev = cookie;
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if (ev->async) {
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mutex_enter(proc_lock);
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psignal(ev->io, SIGIO);
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mutex_exit(proc_lock);
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}
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}
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/*
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* Injects the set of events given in 'events', whose size is 'nevents',
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* into the 'ev' queue. If there is not enough free space to inject them
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* all, returns ENOSPC and the queue is left intact; otherwise returns 0
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* and wakes up all listeners.
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*/
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int
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wsevent_inject(struct wseventvar *ev, struct wscons_event *events,
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size_t nevents)
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{
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size_t avail, i;
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struct timespec t;
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/* Calculate number of free slots in the queue. */
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if (ev->put < ev->get)
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avail = ev->get - ev->put;
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else
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avail = WSEVENT_QSIZE - (ev->put - ev->get);
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KASSERT(avail <= WSEVENT_QSIZE);
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/* Fail if there is all events will not fit in the queue. */
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if (avail < nevents)
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return ENOSPC;
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/* Use the current time for all events. */
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getnanotime(&t);
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/* Inject the events. */
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for (i = 0; i < nevents; i++) {
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struct wscons_event *we;
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we = &ev->q[ev->put];
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we->type = events[i].type;
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we->value = events[i].value;
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we->time = t;
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ev->put = (ev->put + 1) % WSEVENT_QSIZE;
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}
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wsevent_wakeup(ev);
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return 0;
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}
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