1207673Sjoel/*- 2207673Sjoel * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org> 3185162Skmacy * All rights reserved. 4185162Skmacy * 5185162Skmacy * Redistribution and use in source and binary forms, with or without 6207673Sjoel * modification, are permitted provided that the following conditions 7207673Sjoel * are met: 8207673Sjoel * 1. Redistributions of source code must retain the above copyright 9207673Sjoel * notice, this list of conditions and the following disclaimer. 10207673Sjoel * 2. Redistributions in binary form must reproduce the above copyright 11207673Sjoel * notice, this list of conditions and the following disclaimer in the 12207673Sjoel * documentation and/or other materials provided with the distribution. 13185162Skmacy * 14207673Sjoel * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15207673Sjoel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16185162Skmacy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17207673Sjoel * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18207673Sjoel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19207673Sjoel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20207673Sjoel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21207673Sjoel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22207673Sjoel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23207673Sjoel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24207673Sjoel * SUCH DAMAGE. 25207673Sjoel */ 26207673Sjoel 27185162Skmacy#include <sys/cdefs.h> 28185162Skmacy__FBSDID("$FreeBSD$"); 29185162Skmacy 30185162Skmacy 31185162Skmacy#include <sys/param.h> 32185162Skmacy#include <sys/systm.h> 33185162Skmacy#include <sys/kernel.h> 34185162Skmacy#include <sys/malloc.h> 35185162Skmacy#include <sys/ktr.h> 36185162Skmacy#include <sys/buf_ring.h> 37185162Skmacy 38185162Skmacy 39185162Skmacystruct buf_ring * 40185162Skmacybuf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock) 41185162Skmacy{ 42185162Skmacy struct buf_ring *br; 43185162Skmacy 44185162Skmacy KASSERT(powerof2(count), ("buf ring must be size power of 2")); 45185162Skmacy 46185162Skmacy br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t), 47185162Skmacy type, flags|M_ZERO); 48185162Skmacy if (br == NULL) 49185162Skmacy return (NULL); 50185162Skmacy#ifdef DEBUG_BUFRING 51185162Skmacy br->br_lock = lock; 52185162Skmacy#endif 53185162Skmacy br->br_prod_size = br->br_cons_size = count; 54185162Skmacy br->br_prod_mask = br->br_cons_mask = count-1; 55185162Skmacy br->br_prod_head = br->br_cons_head = 0; 56185162Skmacy br->br_prod_tail = br->br_cons_tail = 0; 57185162Skmacy 58185162Skmacy return (br); 59185162Skmacy} 60185162Skmacy 61185162Skmacyvoid 62185162Skmacybuf_ring_free(struct buf_ring *br, struct malloc_type *type) 63185162Skmacy{ 64185162Skmacy free(br, type); 65185162Skmacy} 66