1 /* 2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>. All rights reserved. 3 * Copyright (c) 1998 David Greenman. 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 * $DragonFly: src/sys/sys/sfbuf.h,v 1.9 2006/05/20 02:42:13 dillon Exp $ 27 */ 28 29 #ifndef _SFBUF_H_ 30 #define _SFBUF_H_ 31 32 #ifndef _SYS_TYPES_H_ 33 #include <sys/types.h> 34 #endif 35 #ifndef _SYS_QUEUE_H_ 36 #include <sys/queue.h> 37 #endif 38 39 40 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES) 41 #error "This file should not be included by userland programs." 42 #endif 43 44 struct sf_buf { 45 LIST_ENTRY(sf_buf) list_entry; /* hash chain of active buffers */ 46 TAILQ_ENTRY(sf_buf) free_entry; /* list of free buffers */ 47 struct vm_page *m; /* currently mapped page */ 48 vm_offset_t kva; /* va of mapping */ 49 int refcnt; /* usage of this mapping */ 50 int flags; /* global SFBA flags */ 51 cpumask_t cpumask; /* cpu mapping synchronization */ 52 }; 53 54 /* 55 * sf_buf_alloc() flags (not all are stored in sf->flags) 56 */ 57 #define SFB_CPUPRIVATE 0x0001 /* sync mapping to current cpu only */ 58 #define SFBA_ONFREEQ 0x0002 /* on the free queue (lazy move) */ 59 #define SFB_CATCH 0x0004 /* allow interruption */ 60 61 static __inline vm_offset_t 62 sf_buf_kva(struct sf_buf *sf) 63 { 64 return(sf->kva); 65 } 66 67 static __inline struct vm_page * 68 sf_buf_page(struct sf_buf *sf) 69 { 70 return(sf->m); 71 } 72 73 74 #if defined(_KERNEL) 75 76 extern int nsfbufs; 77 78 struct sf_buf *sf_buf_alloc(struct vm_page *, int flags); 79 void sf_buf_free(struct sf_buf *); 80 void sf_buf_ref(struct sf_buf *); 81 82 #endif 83 84 #endif 85