1/*-
2 * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35#include <sys/ktr.h>
36#include <sys/buf_ring.h>
37
38
39struct buf_ring *
40buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
41{
42	struct buf_ring *br;
43
44	KASSERT(powerof2(count), ("buf ring must be size power of 2"));
45
46	br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
47	    type, flags|M_ZERO);
48	if (br == NULL)
49		return (NULL);
50#ifdef DEBUG_BUFRING
51	br->br_lock = lock;
52#endif
53	br->br_prod_size = br->br_cons_size = count;
54	br->br_prod_mask = br->br_cons_mask = count-1;
55	br->br_prod_head = br->br_cons_head = 0;
56	br->br_prod_tail = br->br_cons_tail = 0;
57
58	return (br);
59}
60
61void
62buf_ring_free(struct buf_ring *br, struct malloc_type *type)
63{
64	free(br, type);
65}
66