1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/ktr.h> 38 #include <sys/buf_ring.h> 39 40 41 struct buf_ring * 42 buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock) 43 { 44 struct buf_ring *br; 45 46 KASSERT(powerof2(count), ("buf ring must be size power of 2")); 47 48 br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t), 49 type, flags|M_ZERO); 50 if (br == NULL) 51 return (NULL); 52 #ifdef DEBUG_BUFRING 53 br->br_lock = lock; 54 #endif 55 br->br_prod_size = br->br_cons_size = count; 56 br->br_prod_mask = br->br_cons_mask = count-1; 57 br->br_prod_head = br->br_cons_head = 0; 58 br->br_prod_tail = br->br_cons_tail = 0; 59 60 return (br); 61 } 62 63 void 64 buf_ring_free(struct buf_ring *br, struct malloc_type *type) 65 { 66 free(br, type); 67 } 68