1 #ifndef _UAPI_LINUX_MEMBARRIER_H 1
2 #define _UAPI_LINUX_MEMBARRIER_H
3
4 /*
5 * linux/membarrier.h
6 *
7 * membarrier system call API
8 *
9 * Copyright (c) 2010, 2015 Mathieu Desnoyers
10 *
11 * Permission is hereby granted, free of charg
12 * of this software and associated documentati
13 * in the Software without restriction, includ
14 * to use, copy, modify, merge, publish, distr
15 * copies of the Software, and to permit perso
16 * furnished to do so, subject to the followin
17 *
18 * The above copyright notice and this permiss
19 * all copies or substantial portions of the S
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT W
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE W
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINF
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE O
27 * SOFTWARE.
28 */
29
30 /**
31 * enum membarrier_cmd - membarrier system cal
32 * @MEMBARRIER_CMD_QUERY: Query the set of s
33 * a bitmask of valid
34 * @MEMBARRIER_CMD_GLOBAL: Execute a memory b
35 * Upon return from s
36 * is ensured that al
37 * through a state wh
38 * user-space address
39 * entry to and retur
40 * (non-running threa
41 * state). This cover
42 * running on the sys
43 * @MEMBARRIER_CMD_GLOBAL_EXPEDITED:
44 * Execute a memory b
45 * of all processes w
46 * with MEMBARRIER_CM
47 * Upon return from s
48 * is ensured that al
49 * through a state wh
50 * user-space address
51 * entry to and retur
52 * (non-running threa
53 * state). This only
54 * which registered w
55 * MEMBARRIER_CMD_REG
56 * This command retur
57 * registration is ab
58 * the barriers, it i
59 * MEMBARRIER_CMD_GLO
60 * non-registered pro
61 * @MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED:
62 * Register the proce
63 * MEMBARRIER_CMD_GLO
64 * barriers. Always r
65 * @MEMBARRIER_CMD_PRIVATE_EXPEDITED:
66 * Execute a memory b
67 * thread belonging t
68 * thread. Upon retur
69 * caller thread is e
70 * threads siblings h
71 * where all memory a
72 * addresses match pr
73 * to and return from
74 * (non-running threa
75 * state). This only
76 * same process as th
77 * command returns 0
78 * "expedited" comman
79 * the non-expedited
80 * but have the downs
81 * overhead. A proces
82 * intent to use the
83 * prior to using it,
84 * returns -EPERM.
85 * @MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED:
86 * Register the proce
87 * MEMBARRIER_CMD_PRI
88 * returns 0.
89 * @MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE
90 * In addition to pro
91 * guarantees describ
92 * MEMBARRIER_CMD_PRI
93 * the caller thread,
94 * call, that all its
95 * have executed a co
96 * instruction. (arch
97 * guarantee that non
98 * core serializing i
99 * resume user-space
100 * covers threads fro
101 * caller thread. Thi
102 * success. The "expe
103 * faster than the no
104 * never block, but h
105 * causing extra over
106 * not implemented by
107 * is returned. A pro
108 * intent to use the
109 * core command prior
110 * this command retur
111 * @MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_
112 * Register the proce
113 * MEMBARRIER_CMD_PRI
114 * If this command is
115 * architecture, -EIN
116 * Returns 0 on succe
117 * @MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ:
118 * Ensure the caller
119 * system call, that
120 * siblings have any
121 * critical sections
122 * parameter is 0; if
123 * MEMBARRIER_CMD_FLA
124 * then this operatio
125 * on CPU indicated b
126 * not implemented by
127 * is returned. A pro
128 * intent to use the
129 * command prior to u
130 * this command retur
131 * @MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_
132 * Register the proce
133 * MEMBARRIER_CMD_PRI
134 * If this command is
135 * architecture, -EIN
136 * Returns 0 on succe
137 * @MEMBARRIER_CMD_SHARED:
138 * Alias to MEMBARRIE
139 * header backward co
140 * @MEMBARRIER_CMD_GET_REGISTRATIONS:
141 * Returns a bitmask
142 * registration comma
143 *
144 * Command to be passed to the membarrier syst
145 * be a single bit each, except for MEMBARRIER
146 * the value 0.
147 */
148 enum membarrier_cmd {
149 MEMBARRIER_CMD_QUERY
150 MEMBARRIER_CMD_GLOBAL
151 MEMBARRIER_CMD_GLOBAL_EXPEDITED
152 MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDIT
153 MEMBARRIER_CMD_PRIVATE_EXPEDITED
154 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDI
155 MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_
156 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDI
157 MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ
158 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDI
159 MEMBARRIER_CMD_GET_REGISTRATIONS
160
161 /* Alias for header backward compatibi
162 MEMBARRIER_CMD_SHARED
163 };
164
165 enum membarrier_cmd_flag {
166 MEMBARRIER_CMD_FLAG_CPU = (1 <
167 };
168
169 #endif /* _UAPI_LINUX_MEMBARRIER_H */
170
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