8a36da99de
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
343 lines
6.7 KiB
C
343 lines
6.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2000,2003 Doug Rabson
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/kobj.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#ifndef TEST
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#include <sys/systm.h>
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#endif
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#ifdef TEST
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#include "usertest.h"
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#endif
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static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
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#ifdef KOBJ_STATS
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u_int kobj_lookup_hits;
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u_int kobj_lookup_misses;
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SYSCTL_UINT(_kern, OID_AUTO, kobj_hits, CTLFLAG_RD,
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&kobj_lookup_hits, 0, "");
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SYSCTL_UINT(_kern, OID_AUTO, kobj_misses, CTLFLAG_RD,
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&kobj_lookup_misses, 0, "");
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#endif
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static struct mtx kobj_mtx;
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static int kobj_mutex_inited;
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static int kobj_next_id = 1;
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#define KOBJ_LOCK() mtx_lock(&kobj_mtx)
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#define KOBJ_UNLOCK() mtx_unlock(&kobj_mtx)
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#define KOBJ_ASSERT(what) mtx_assert(&kobj_mtx, what);
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SYSCTL_INT(_kern, OID_AUTO, kobj_methodcount, CTLFLAG_RD,
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&kobj_next_id, 0, "");
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static void
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kobj_init_mutex(void *arg)
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{
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if (!kobj_mutex_inited) {
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mtx_init(&kobj_mtx, "kobj", NULL, MTX_DEF);
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kobj_mutex_inited = 1;
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}
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}
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SYSINIT(kobj, SI_SUB_LOCK, SI_ORDER_ANY, kobj_init_mutex, NULL);
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/*
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* This method structure is used to initialise new caches. Since the
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* desc pointer is NULL, it is guaranteed never to match any read
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* descriptors.
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*/
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static const struct kobj_method null_method = {
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0, 0,
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};
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int
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kobj_error_method(void)
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{
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return ENXIO;
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}
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static void
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kobj_class_compile_common(kobj_class_t cls, kobj_ops_t ops)
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{
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kobj_method_t *m;
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int i;
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/*
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* Don't do anything if we are already compiled.
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*/
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if (cls->ops)
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return;
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/*
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* First register any methods which need it.
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*/
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for (i = 0, m = cls->methods; m->desc; i++, m++) {
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if (m->desc->id == 0)
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m->desc->id = kobj_next_id++;
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}
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/*
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* Then initialise the ops table.
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*/
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for (i = 0; i < KOBJ_CACHE_SIZE; i++)
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ops->cache[i] = &null_method;
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ops->cls = cls;
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cls->ops = ops;
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}
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void
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kobj_class_compile(kobj_class_t cls)
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{
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kobj_ops_t ops;
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KOBJ_ASSERT(MA_NOTOWNED);
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/*
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* Allocate space for the compiled ops table.
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*/
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ops = malloc(sizeof(struct kobj_ops), M_KOBJ, M_NOWAIT);
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if (!ops)
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panic("%s: out of memory", __func__);
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KOBJ_LOCK();
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/*
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* We may have lost a race for kobj_class_compile here - check
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* to make sure someone else hasn't already compiled this
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* class.
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*/
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if (cls->ops) {
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KOBJ_UNLOCK();
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free(ops, M_KOBJ);
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return;
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}
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kobj_class_compile_common(cls, ops);
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KOBJ_UNLOCK();
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}
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void
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kobj_class_compile_static(kobj_class_t cls, kobj_ops_t ops)
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{
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KASSERT(kobj_mutex_inited == 0,
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("%s: only supported during early cycles", __func__));
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/*
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* Increment refs to make sure that the ops table is not freed.
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*/
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cls->refs++;
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kobj_class_compile_common(cls, ops);
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}
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static kobj_method_t*
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kobj_lookup_method_class(kobj_class_t cls, kobjop_desc_t desc)
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{
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kobj_method_t *methods = cls->methods;
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kobj_method_t *ce;
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for (ce = methods; ce && ce->desc; ce++) {
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if (ce->desc == desc) {
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return ce;
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}
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}
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return NULL;
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}
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static kobj_method_t*
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kobj_lookup_method_mi(kobj_class_t cls,
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kobjop_desc_t desc)
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{
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kobj_method_t *ce;
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kobj_class_t *basep;
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ce = kobj_lookup_method_class(cls, desc);
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if (ce)
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return ce;
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basep = cls->baseclasses;
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if (basep) {
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for (; *basep; basep++) {
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ce = kobj_lookup_method_mi(*basep, desc);
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if (ce)
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return ce;
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}
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}
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return NULL;
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}
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kobj_method_t*
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kobj_lookup_method(kobj_class_t cls,
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kobj_method_t **cep,
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kobjop_desc_t desc)
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{
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kobj_method_t *ce;
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ce = kobj_lookup_method_mi(cls, desc);
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if (!ce)
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ce = &desc->deflt;
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if (cep)
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*cep = ce;
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return ce;
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}
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void
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kobj_class_free(kobj_class_t cls)
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{
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void* ops = NULL;
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KOBJ_ASSERT(MA_NOTOWNED);
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KOBJ_LOCK();
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/*
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* Protect against a race between kobj_create and
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* kobj_delete.
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*/
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if (cls->refs == 0) {
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/*
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* For now we don't do anything to unregister any methods
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* which are no longer used.
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*/
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/*
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* Free memory and clean up.
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*/
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ops = cls->ops;
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cls->ops = NULL;
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}
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KOBJ_UNLOCK();
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if (ops)
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free(ops, M_KOBJ);
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}
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kobj_t
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kobj_create(kobj_class_t cls,
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struct malloc_type *mtype,
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int mflags)
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{
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kobj_t obj;
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/*
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* Allocate and initialise the new object.
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*/
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obj = malloc(cls->size, mtype, mflags | M_ZERO);
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if (!obj)
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return NULL;
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kobj_init(obj, cls);
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return obj;
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}
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static void
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kobj_init_common(kobj_t obj, kobj_class_t cls)
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{
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obj->ops = cls->ops;
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cls->refs++;
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}
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void
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kobj_init(kobj_t obj, kobj_class_t cls)
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{
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KOBJ_ASSERT(MA_NOTOWNED);
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retry:
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KOBJ_LOCK();
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/*
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* Consider compiling the class' method table.
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*/
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if (!cls->ops) {
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/*
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* kobj_class_compile doesn't want the lock held
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* because of the call to malloc - we drop the lock
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* and re-try.
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*/
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KOBJ_UNLOCK();
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kobj_class_compile(cls);
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goto retry;
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}
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kobj_init_common(obj, cls);
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KOBJ_UNLOCK();
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}
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void
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kobj_init_static(kobj_t obj, kobj_class_t cls)
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{
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KASSERT(kobj_mutex_inited == 0,
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("%s: only supported during early cycles", __func__));
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kobj_init_common(obj, cls);
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}
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void
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kobj_delete(kobj_t obj, struct malloc_type *mtype)
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{
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kobj_class_t cls = obj->ops->cls;
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int refs;
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/*
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* Consider freeing the compiled method table for the class
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* after its last instance is deleted. As an optimisation, we
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* should defer this for a short while to avoid thrashing.
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*/
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KOBJ_ASSERT(MA_NOTOWNED);
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KOBJ_LOCK();
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cls->refs--;
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refs = cls->refs;
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KOBJ_UNLOCK();
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if (!refs)
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kobj_class_free(cls);
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obj->ops = NULL;
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if (mtype)
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free(obj, mtype);
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}
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