xref: /titanic_41/usr/src/lib/librsm/inc/rsmlib_in.h (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2001-2002 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef _RSMLIB_IN_H
28 #define	_RSMLIB_IN_H
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #ifdef	__cplusplus
33 extern "C" {
34 #endif
35 
36 #include <sys/types.h>
37 #include <sys/mman.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 
41 #define	LOOPBACK "loopback"
42 #define	DEVRSM "/dev/rsm"
43 #define	RSMSEGIDFILE	"/etc/rsm/rsm.segmentid"
44 #define	RSMSEG_RESERVED	"reserved"
45 
46 #define	RSM_IMPORT_SEG	1
47 #define	RSM_EXPORT_SEG	2
48 
49 #define	RSM_MAX_HANDLE_DVMA	0x2000
50 
51 /* This is the default barrier implementation structure */
52 typedef struct {
53 	rsmseg_handle_t	*rsmgenbar_seg;
54 	uint16_t	rsmgenbar_gen;
55 	rsm_barrier_t	*rsmgenbar_data;
56 }rsmgenbar_handle_t;
57 
58 #define	RSM_MAX_BUCKETS		128 /* # buckets in the hash table */
59 #define	RSM_POLLFD_PER_CHUNK	16  /* # pollfd in each chunk */
60 
61 /* least significant 3 bytes of the fd should be unique enough */
62 #define	RSM_POLLFD_HASH(fd)	(((fd) ^ ((fd) >> 8) ^ ((fd) >> 16)) % \
63 		RSM_MAX_BUCKETS)
64 
65 /*
66  * pollfd_table maintains a mapping from fd to resource number. It also
67  * provides a mechanism to check if a given fd corresponds to an rsmapi
68  * segment. Entries get added to this table as a result of
69  * rsm_memseg_get_pollfd and removed as a result of rsm_memseg_release_pollfd.
70  */
71 typedef struct {
72 	int		fd;
73 	minor_t		segrnum;
74 }rsm_pollfd_element_t;
75 
76 typedef struct rsm_pollfd_chunk {
77 	struct rsm_pollfd_chunk	*next;
78 	int			nfree;
79 	rsm_pollfd_element_t	fdarray[RSM_POLLFD_PER_CHUNK];
80 } rsm_pollfd_chunk_t;
81 
82 typedef struct {
83 	mutex_t			lock;
84 	rsm_pollfd_chunk_t	*buckets[RSM_MAX_BUCKETS];
85 } rsm_pollfd_table_t;
86 
87 /*
88  * The following macros are defined only if the DEBUG flag is enabled
89  * The macro makes use of category and level values defined in rsm.h
90  * and the dbg_printf function defined in rsmlib.c (defined as an
91  * extern below)
92  */
93 #ifdef	DEBUG
94 #define	TRACELOG "/tmp/librsm.log"
95 #define	DBPRINTF(msg) dbg_printf msg
96 #else
97 #define	TRACELOG
98 #define	DBPRINTF(msg)
99 #endif
100 
101 extern void dbg_printf(int category, int level, char *fmt, ...);
102 
103 typedef int (*rsm_attach_entry_t)(int, rsm_segops_t **);
104 
105 #ifdef	__cplusplus
106 }
107 #endif
108 
109 #endif	/* _RSMLIB_IN_H */
110