1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org>
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/kernel.h>
32#include <sys/malloc.h>
33#include <sys/ktr.h>
34#include <sys/buf_ring.h>
35
36struct buf_ring *
37buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
38{
39	struct buf_ring *br;
40
41	KASSERT(powerof2(count), ("buf ring must be size power of 2"));
42
43	br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
44	    type, flags|M_ZERO);
45	if (br == NULL)
46		return (NULL);
47#ifdef DEBUG_BUFRING
48	br->br_lock = lock;
49#endif
50	br->br_prod_size = br->br_cons_size = count;
51	br->br_prod_mask = br->br_cons_mask = count-1;
52	br->br_prod_head = br->br_cons_head = 0;
53	br->br_prod_tail = br->br_cons_tail = 0;
54
55	return (br);
56}
57
58void
59buf_ring_free(struct buf_ring *br, struct malloc_type *type)
60{
61	free(br, type);
62}
63