d09ebcec17
Just place the default kobj_method inside the kobjop_desc structure. There's no need to give these kobj_methods their own symbol. This shaves off 10 KB of a GENERIC kernel binary.
362 lines
7.2 KiB
C
362 lines
7.2 KiB
C
/*-
|
|
* Copyright (c) 2000,2003 Doug Rabson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kobj.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sysctl.h>
|
|
#ifndef TEST
|
|
#include <sys/systm.h>
|
|
#endif
|
|
|
|
#ifdef TEST
|
|
#include "usertest.h"
|
|
#endif
|
|
|
|
static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
|
|
|
|
#ifdef KOBJ_STATS
|
|
|
|
u_int kobj_lookup_hits;
|
|
u_int kobj_lookup_misses;
|
|
|
|
SYSCTL_UINT(_kern, OID_AUTO, kobj_hits, CTLFLAG_RD,
|
|
&kobj_lookup_hits, 0, "");
|
|
SYSCTL_UINT(_kern, OID_AUTO, kobj_misses, CTLFLAG_RD,
|
|
&kobj_lookup_misses, 0, "");
|
|
|
|
#endif
|
|
|
|
static struct mtx kobj_mtx;
|
|
static int kobj_mutex_inited;
|
|
static int kobj_next_id = 1;
|
|
|
|
/*
|
|
* In the event that kobj_mtx has not been initialized yet,
|
|
* we will ignore it, and run without locks in order to support
|
|
* use of KOBJ before mutexes are available. This early in the boot
|
|
* process, everything is single threaded and so races should not
|
|
* happen. This is used to provide the PMAP layer on PowerPC, as well
|
|
* as board support.
|
|
*/
|
|
|
|
#define KOBJ_LOCK() if (kobj_mutex_inited) mtx_lock(&kobj_mtx);
|
|
#define KOBJ_UNLOCK() if (kobj_mutex_inited) mtx_unlock(&kobj_mtx);
|
|
#define KOBJ_ASSERT(what) if (kobj_mutex_inited) mtx_assert(&kobj_mtx,what);
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, kobj_methodcount, CTLFLAG_RD,
|
|
&kobj_next_id, 0, "");
|
|
|
|
static void
|
|
kobj_init_mutex(void *arg)
|
|
{
|
|
if (!kobj_mutex_inited) {
|
|
mtx_init(&kobj_mtx, "kobj", NULL, MTX_DEF);
|
|
kobj_mutex_inited = 1;
|
|
}
|
|
}
|
|
|
|
SYSINIT(kobj, SI_SUB_LOCK, SI_ORDER_ANY, kobj_init_mutex, NULL);
|
|
|
|
/*
|
|
* This method structure is used to initialise new caches. Since the
|
|
* desc pointer is NULL, it is guaranteed never to match any read
|
|
* descriptors.
|
|
*/
|
|
static const struct kobj_method null_method = {
|
|
0, 0,
|
|
};
|
|
|
|
int
|
|
kobj_error_method(void)
|
|
{
|
|
|
|
return ENXIO;
|
|
}
|
|
|
|
static void
|
|
kobj_register_method(struct kobjop_desc *desc)
|
|
{
|
|
KOBJ_ASSERT(MA_OWNED);
|
|
|
|
if (desc->id == 0) {
|
|
desc->id = kobj_next_id++;
|
|
}
|
|
}
|
|
|
|
static void
|
|
kobj_unregister_method(struct kobjop_desc *desc)
|
|
{
|
|
}
|
|
|
|
static void
|
|
kobj_class_compile_common(kobj_class_t cls, kobj_ops_t ops)
|
|
{
|
|
kobj_method_t *m;
|
|
int i;
|
|
|
|
KOBJ_ASSERT(MA_OWNED);
|
|
|
|
/*
|
|
* Don't do anything if we are already compiled.
|
|
*/
|
|
if (cls->ops)
|
|
return;
|
|
|
|
/*
|
|
* First register any methods which need it.
|
|
*/
|
|
for (i = 0, m = cls->methods; m->desc; i++, m++)
|
|
kobj_register_method(m->desc);
|
|
|
|
/*
|
|
* Then initialise the ops table.
|
|
*/
|
|
for (i = 0; i < KOBJ_CACHE_SIZE; i++)
|
|
ops->cache[i] = &null_method;
|
|
ops->cls = cls;
|
|
cls->ops = ops;
|
|
}
|
|
|
|
void
|
|
kobj_class_compile(kobj_class_t cls)
|
|
{
|
|
kobj_ops_t ops;
|
|
|
|
KOBJ_ASSERT(MA_NOTOWNED);
|
|
|
|
/*
|
|
* Allocate space for the compiled ops table.
|
|
*/
|
|
ops = malloc(sizeof(struct kobj_ops), M_KOBJ, M_NOWAIT);
|
|
if (!ops)
|
|
panic("kobj_compile_methods: out of memory");
|
|
|
|
KOBJ_LOCK();
|
|
|
|
/*
|
|
* We may have lost a race for kobj_class_compile here - check
|
|
* to make sure someone else hasn't already compiled this
|
|
* class.
|
|
*/
|
|
if (cls->ops) {
|
|
KOBJ_UNLOCK();
|
|
free(ops, M_KOBJ);
|
|
return;
|
|
}
|
|
|
|
kobj_class_compile_common(cls, ops);
|
|
KOBJ_UNLOCK();
|
|
}
|
|
|
|
void
|
|
kobj_class_compile_static(kobj_class_t cls, kobj_ops_t ops)
|
|
{
|
|
|
|
KOBJ_ASSERT(MA_NOTOWNED);
|
|
|
|
/*
|
|
* Increment refs to make sure that the ops table is not freed.
|
|
*/
|
|
KOBJ_LOCK();
|
|
|
|
cls->refs++;
|
|
kobj_class_compile_common(cls, ops);
|
|
|
|
KOBJ_UNLOCK();
|
|
}
|
|
|
|
static kobj_method_t*
|
|
kobj_lookup_method_class(kobj_class_t cls, kobjop_desc_t desc)
|
|
{
|
|
kobj_method_t *methods = cls->methods;
|
|
kobj_method_t *ce;
|
|
|
|
for (ce = methods; ce && ce->desc; ce++) {
|
|
if (ce->desc == desc) {
|
|
return ce;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static kobj_method_t*
|
|
kobj_lookup_method_mi(kobj_class_t cls,
|
|
kobjop_desc_t desc)
|
|
{
|
|
kobj_method_t *ce;
|
|
kobj_class_t *basep;
|
|
|
|
ce = kobj_lookup_method_class(cls, desc);
|
|
if (ce)
|
|
return ce;
|
|
|
|
basep = cls->baseclasses;
|
|
if (basep) {
|
|
for (; *basep; basep++) {
|
|
ce = kobj_lookup_method_mi(*basep, desc);
|
|
if (ce)
|
|
return ce;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
kobj_method_t*
|
|
kobj_lookup_method(kobj_class_t cls,
|
|
kobj_method_t **cep,
|
|
kobjop_desc_t desc)
|
|
{
|
|
kobj_method_t *ce;
|
|
|
|
#ifdef KOBJ_STATS
|
|
/*
|
|
* Correct for the 'hit' assumption in KOBJOPLOOKUP and record
|
|
* a 'miss'.
|
|
*/
|
|
kobj_lookup_hits--;
|
|
kobj_lookup_misses++;
|
|
#endif
|
|
|
|
ce = kobj_lookup_method_mi(cls, desc);
|
|
if (!ce)
|
|
ce = &desc->deflt;
|
|
*cep = ce;
|
|
return ce;
|
|
}
|
|
|
|
void
|
|
kobj_class_free(kobj_class_t cls)
|
|
{
|
|
int i;
|
|
kobj_method_t *m;
|
|
void* ops = NULL;
|
|
|
|
KOBJ_ASSERT(MA_NOTOWNED);
|
|
KOBJ_LOCK();
|
|
|
|
/*
|
|
* Protect against a race between kobj_create and
|
|
* kobj_delete.
|
|
*/
|
|
if (cls->refs == 0) {
|
|
/*
|
|
* Unregister any methods which are no longer used.
|
|
*/
|
|
for (i = 0, m = cls->methods; m->desc; i++, m++)
|
|
kobj_unregister_method(m->desc);
|
|
|
|
/*
|
|
* Free memory and clean up.
|
|
*/
|
|
ops = cls->ops;
|
|
cls->ops = NULL;
|
|
}
|
|
|
|
KOBJ_UNLOCK();
|
|
|
|
if (ops)
|
|
free(ops, M_KOBJ);
|
|
}
|
|
|
|
kobj_t
|
|
kobj_create(kobj_class_t cls,
|
|
struct malloc_type *mtype,
|
|
int mflags)
|
|
{
|
|
kobj_t obj;
|
|
|
|
/*
|
|
* Allocate and initialise the new object.
|
|
*/
|
|
obj = malloc(cls->size, mtype, mflags | M_ZERO);
|
|
if (!obj)
|
|
return NULL;
|
|
kobj_init(obj, cls);
|
|
|
|
return obj;
|
|
}
|
|
|
|
void
|
|
kobj_init(kobj_t obj, kobj_class_t cls)
|
|
{
|
|
KOBJ_ASSERT(MA_NOTOWNED);
|
|
retry:
|
|
KOBJ_LOCK();
|
|
|
|
/*
|
|
* Consider compiling the class' method table.
|
|
*/
|
|
if (!cls->ops) {
|
|
/*
|
|
* kobj_class_compile doesn't want the lock held
|
|
* because of the call to malloc - we drop the lock
|
|
* and re-try.
|
|
*/
|
|
KOBJ_UNLOCK();
|
|
kobj_class_compile(cls);
|
|
goto retry;
|
|
}
|
|
|
|
obj->ops = cls->ops;
|
|
cls->refs++;
|
|
|
|
KOBJ_UNLOCK();
|
|
}
|
|
|
|
void
|
|
kobj_delete(kobj_t obj, struct malloc_type *mtype)
|
|
{
|
|
kobj_class_t cls = obj->ops->cls;
|
|
int refs;
|
|
|
|
/*
|
|
* Consider freeing the compiled method table for the class
|
|
* after its last instance is deleted. As an optimisation, we
|
|
* should defer this for a short while to avoid thrashing.
|
|
*/
|
|
KOBJ_ASSERT(MA_NOTOWNED);
|
|
KOBJ_LOCK();
|
|
cls->refs--;
|
|
refs = cls->refs;
|
|
KOBJ_UNLOCK();
|
|
|
|
if (!refs)
|
|
kobj_class_free(cls);
|
|
|
|
obj->ops = NULL;
|
|
if (mtype)
|
|
free(obj, mtype);
|
|
}
|