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