2 * Copyright (c) 2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/subr_kobj.c,v 1.4.2.1 2001/02/02 19:49:13 cg Exp $
27 * $DragonFly: src/sys/kern/subr_kobj.c,v 1.8 2006/09/05 00:55:45 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/queue.h>
32 #include <sys/malloc.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/errno.h>
36 #include <sys/thread.h>
37 #include <sys/thread2.h>
39 #include <sys/systm.h>
47 static MALLOC_DEFINE(M_KOBJ
, "kobj", "Kernel object structures");
51 #include <sys/sysctl.h>
53 u_int kobj_lookup_hits
;
54 u_int kobj_lookup_misses
;
56 SYSCTL_UINT(_kern
, OID_AUTO
, kobj_hits
, CTLFLAG_RD
,
57 &kobj_lookup_hits
, 0, "")
58 SYSCTL_UINT(_kern
, OID_AUTO
, kobj_misses
, CTLFLAG_RD
,
59 &kobj_lookup_misses
, 0, "")
63 static struct lwkt_token kobj_token
;
64 static int kobj_next_id
= 1;
67 kobj_init_token(void *arg
)
69 lwkt_token_init(&kobj_token
);
72 SYSINIT(kobj
, SI_SUB_LOCK
, SI_ORDER_ANY
, kobj_init_token
, NULL
);
75 * This method structure is used to initialise new caches. Since the
76 * desc pointer is NULL, it is guaranteed never to match any real
79 static struct kobj_method null_method
= {
84 kobj_error_method(void)
90 kobj_register_method(struct kobjop_desc
*desc
)
93 desc
->id
= kobj_next_id
++;
97 kobj_unregister_method(struct kobjop_desc
*desc
)
102 kobj_class_compile(kobj_class_t cls
)
109 * Don't do anything if we are already compiled.
115 * Allocate space for the compiled ops table.
117 ops
= kmalloc(sizeof(struct kobj_ops
), M_KOBJ
, M_INTWAIT
);
118 for (i
= 0; i
< KOBJ_CACHE_SIZE
; i
++)
119 ops
->cache
[i
] = &null_method
;
122 * In case of preemption, another thread might have been faster,
123 * but that's fine for us.
131 panic("kobj_compile_methods: out of memory");
137 * Afterwards register any methods which need it.
139 for (m
= cls
->methods
; m
->desc
; m
++)
140 kobj_register_method(m
->desc
);
143 static kobj_method_t
*
144 kobj_lookup_method_class(kobj_class_t cls
, kobjop_desc_t desc
)
146 kobj_method_t
*methods
= cls
->methods
;
149 for (ce
= methods
; ce
&& ce
->desc
; ce
++)
150 if (ce
->desc
== desc
)
156 static kobj_method_t
*
157 kobj_lookup_method_mi(kobj_class_t cls
, kobjop_desc_t desc
)
162 ce
= kobj_lookup_method_class(cls
, desc
);
166 basep
= cls
->baseclasses
;
168 for (; *basep
; basep
++) {
169 ce
= kobj_lookup_method_mi(*basep
, desc
);
179 kobj_lookup_method(kobj_class_t cls
,
187 * Correct for the 'hit' assumption in KOBJOPLOOKUP and record
191 kobj_lookup_misses
--;
194 ce
= kobj_lookup_method_mi(cls
, desc
);
202 kobj_class_free(kobj_class_t cls
)
208 * Unregister any methods which are no longer used.
210 for (i
= 0, m
= cls
->methods
; m
->desc
; i
++, m
++)
211 kobj_unregister_method(m
->desc
);
214 * Free memory and clean up.
216 kfree(cls
->ops
, M_KOBJ
);
221 kobj_class_instantiate(kobj_class_t cls
)
225 lwkt_gettoken(&ilock
, &kobj_token
);
229 kobj_class_compile(cls
);
233 lwkt_reltoken(&ilock
);
237 kobj_class_uninstantiate(kobj_class_t cls
)
241 lwkt_gettoken(&ilock
, &kobj_token
);
246 kobj_class_free(cls
);
249 lwkt_reltoken(&ilock
);
253 kobj_create(kobj_class_t cls
,
254 struct malloc_type
*mtype
,
260 * Allocate and initialise the new object.
262 obj
= kmalloc(cls
->size
, mtype
, mflags
| M_ZERO
);
271 kobj_init(kobj_t obj
, kobj_class_t cls
)
273 kobj_class_instantiate(cls
);
278 kobj_delete(kobj_t obj
, struct malloc_type
*mtype
)
280 kobj_class_t cls
= obj
->ops
->cls
;
282 kobj_class_uninstantiate(cls
);