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subr_evcnt.c revision 1.4.90.1 
      1 /* $NetBSD: subr_evcnt.c,v 1.4.90.1 2009/05/13 17:21:57 jym Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1996, 2000 Christopher G. Demetriou
      5  * All rights reserved.
      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  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *          This product includes software developed for the
     18  *          NetBSD Project.  See http://www.NetBSD.org/ for
     19  *          information about NetBSD.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  *
     34  * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )--
     35  */
     36 
     37 /*
     38  * Copyright (c) 1992, 1993
     39  *	The Regents of the University of California.  All rights reserved.
     40  *
     41  * This software was developed by the Computer Systems Engineering group
     42  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     43  * contributed to Berkeley.
     44  *
     45  * All advertising materials mentioning features or use of this software
     46  * must display the following acknowledgement:
     47  *	This product includes software developed by the University of
     48  *	California, Lawrence Berkeley Laboratories.
     49  *
     50  * Redistribution and use in source and binary forms, with or without
     51  * modification, are permitted provided that the following conditions
     52  * are met:
     53  * 1. Redistributions of source code must retain the above copyright
     54  *    notice, this list of conditions and the following disclaimer.
     55  * 2. Redistributions in binary form must reproduce the above copyright
     56  *    notice, this list of conditions and the following disclaimer in the
     57  *    documentation and/or other materials provided with the distribution.
     58  * 3. Neither the name of the University nor the names of its contributors
     59  *    may be used to endorse or promote products derived from this software
     60  *    without specific prior written permission.
     61  *
     62  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     63  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     64  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     65  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     66  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     67  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     68  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     69  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     70  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     71  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     72  * SUCH DAMAGE.
     73  *
     74  * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp  (LBL)
     75  *
     76  *	@(#)subr_autoconf.c	8.3 (Berkeley) 5/17/94
     77  */
     78 
     79 #include <sys/cdefs.h>
     80 __KERNEL_RCSID(0, "$NetBSD: subr_evcnt.c,v 1.4.90.1 2009/05/13 17:21:57 jym Exp $");
     81 
     82 #include <sys/param.h>
     83 #include <sys/device.h>
     84 #include <sys/mutex.h>
     85 #include <sys/systm.h>
     86 
     87 /* list of all events */
     88 struct evcntlist allevents = TAILQ_HEAD_INITIALIZER(allevents);
     89 static kmutex_t evmtx;
     90 
     91 /*
     92  * We need a dummy object to stuff into the evcnt link set to
     93  * ensure that there always is at least one object in the set.
     94  */
     95 static struct evcnt dummy_static_evcnt;
     96 __link_set_add_bss(evcnts, dummy_static_evcnt);
     97 
     98 /*
     99  * Initialize event counters.  This does the attach procedure for
    100  * each of the static event counters in the "evcnts" link set.
    101  */
    102 void
    103 evcnt_init(void)
    104 {
    105 	__link_set_decl(evcnts, struct evcnt);
    106 	struct evcnt * const *evp;
    107 
    108 	mutex_init(&evmtx, MUTEX_DEFAULT, IPL_NONE);
    109 
    110 	__link_set_foreach(evp, evcnts) {
    111 		if (*evp == &dummy_static_evcnt)
    112 			continue;
    113 		evcnt_attach_static(*evp);
    114 	}
    115 }
    116 
    117 /*
    118  * Attach a statically-initialized event.  The type and string pointers
    119  * are already set up.
    120  */
    121 void
    122 evcnt_attach_static(struct evcnt *ev)
    123 {
    124 	int len;
    125 
    126 	len = strlen(ev->ev_group);
    127 #ifdef DIAGNOSTIC
    128 	if (len >= EVCNT_STRING_MAX)		/* ..._MAX includes NUL */
    129 		panic("evcnt_attach_static: group length (%s)", ev->ev_group);
    130 #endif
    131 	ev->ev_grouplen = len;
    132 
    133 	len = strlen(ev->ev_name);
    134 #ifdef DIAGNOSTIC
    135 	if (len >= EVCNT_STRING_MAX)		/* ..._MAX includes NUL */
    136 		panic("evcnt_attach_static: name length (%s)", ev->ev_name);
    137 #endif
    138 	ev->ev_namelen = len;
    139 
    140 	mutex_enter(&evmtx);
    141 	TAILQ_INSERT_TAIL(&allevents, ev, ev_list);
    142 	mutex_exit(&evmtx);
    143 }
    144 
    145 /*
    146  * Attach a dynamically-initialized event.  Zero it, set up the type
    147  * and string pointers and then act like it was statically initialized.
    148  */
    149 void
    150 evcnt_attach_dynamic(struct evcnt *ev, int type, const struct evcnt *parent,
    151     const char *group, const char *name)
    152 {
    153 
    154 	memset(ev, 0, sizeof *ev);
    155 	ev->ev_type = type;
    156 	ev->ev_parent = parent;
    157 	ev->ev_group = group;
    158 	ev->ev_name = name;
    159 	evcnt_attach_static(ev);
    160 }
    161 
    162 /*
    163  * Detach an event.
    164  */
    165 void
    166 evcnt_detach(struct evcnt *ev)
    167 {
    168 
    169 	mutex_enter(&evmtx);
    170 	TAILQ_REMOVE(&allevents, ev, ev_list);
    171 	mutex_exit(&evmtx);
    172 }
    173