1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
ATOMICDIR=$(dirname $0)
. ${ATOMICDIR}/atomic-tbl.sh
#gen_template_fallback(template, meta, pfx, name, sfx, order, atomic, int, args...)
gen_template_fallback()
{
local template="$1"; shift
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local atomic="$1"; shift
local int="$1"; shift
local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
local ret="$(gen_ret_type "${meta}" "${int}")"
local retstmt="$(gen_ret_stmt "${meta}")"
local params="$(gen_params "${int}" "${atomic}" "$@")"
local args="$(gen_args "$@")"
if [ ! -z "${template}" ]; then
printf "#ifndef ${atomicname}\n"
. ${template}
printf "#define ${atomicname} ${atomicname}\n"
printf "#endif\n\n"
fi
}
#gen_proto_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
gen_proto_fallback()
{
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local tmpl="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
}
#gen_basic_fallbacks(basename)
gen_basic_fallbacks()
{
local basename="$1"; shift
cat << EOF
#define ${basename}_acquire ${basename}
#define ${basename}_release ${basename}
#define ${basename}_relaxed ${basename}
EOF
}
gen_proto_order_variant()
{
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local atomic="$1"
local basename="arch_${atomic}_${pfx}${name}${sfx}"
printf "#define ${basename}${order} ${basename}${order}\n"
}
#gen_proto_order_variants(meta, pfx, name, sfx, atomic, int, args...)
gen_proto_order_variants()
{
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local atomic="$1"
local basename="arch_${atomic}_${pfx}${name}${sfx}"
local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
# read_acquire and set_release need to be templated, though
if ! meta_has_relaxed "${meta}"; then
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
if meta_has_acquire "${meta}"; then
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
fi
if meta_has_release "${meta}"; then
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
fi
return
fi
printf "#ifndef ${basename}_relaxed\n"
if [ ! -z "${template}" ]; then
printf "#ifdef ${basename}\n"
fi
gen_basic_fallbacks "${basename}"
if [ ! -z "${template}" ]; then
printf "#endif /* ${basename} */\n\n"
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
fi
printf "#else /* ${basename}_relaxed */\n\n"
gen_template_fallback "${ATOMICDIR}/fallbacks/acquire" "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
gen_template_fallback "${ATOMICDIR}/fallbacks/release" "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
gen_template_fallback "${ATOMICDIR}/fallbacks/fence" "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
printf "#endif /* ${basename}_relaxed */\n\n"
}
gen_order_fallbacks()
{
local xchg="$1"; shift
cat <<EOF
#ifndef ${xchg}_acquire
#define ${xchg}_acquire(...) \\
__atomic_op_acquire(${xchg}, __VA_ARGS__)
#endif
#ifndef ${xchg}_release
#define ${xchg}_release(...) \\
__atomic_op_release(${xchg}, __VA_ARGS__)
#endif
#ifndef ${xchg}
#define ${xchg}(...) \\
__atomic_op_fence(${xchg}, __VA_ARGS__)
#endif
EOF
}
gen_xchg_fallbacks()
{
local xchg="$1"; shift
printf "#ifndef ${xchg}_relaxed\n"
gen_basic_fallbacks ${xchg}
printf "#else /* ${xchg}_relaxed */\n"
gen_order_fallbacks ${xchg}
printf "#endif /* ${xchg}_relaxed */\n\n"
}
gen_try_cmpxchg_fallback()
{
local order="$1"; shift;
cat <<EOF
#ifndef arch_try_cmpxchg${order}
#define arch_try_cmpxchg${order}(_ptr, _oldp, _new) \\
({ \\
typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
___r = arch_cmpxchg${order}((_ptr), ___o, (_new)); \\
if (unlikely(___r != ___o)) \\
*___op = ___r; \\
likely(___r == ___o); \\
})
#endif /* arch_try_cmpxchg${order} */
EOF
}
gen_try_cmpxchg_fallbacks()
{
printf "#ifndef arch_try_cmpxchg_relaxed\n"
printf "#ifdef arch_try_cmpxchg\n"
gen_basic_fallbacks "arch_try_cmpxchg"
printf "#endif /* arch_try_cmpxchg */\n\n"
for order in "" "_acquire" "_release" "_relaxed"; do
gen_try_cmpxchg_fallback "${order}"
done
printf "#else /* arch_try_cmpxchg_relaxed */\n"
gen_order_fallbacks "arch_try_cmpxchg"
printf "#endif /* arch_try_cmpxchg_relaxed */\n\n"
}
cat << EOF
// SPDX-License-Identifier: GPL-2.0
// Generated by $0
// DO NOT MODIFY THIS FILE DIRECTLY
#ifndef _LINUX_ATOMIC_FALLBACK_H
#define _LINUX_ATOMIC_FALLBACK_H
#include <linux/compiler.h>
EOF
for xchg in "arch_xchg" "arch_cmpxchg" "arch_cmpxchg64"; do
gen_xchg_fallbacks "${xchg}"
done
gen_try_cmpxchg_fallbacks
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic" "int" ${args}
done
cat <<EOF
#ifdef CONFIG_GENERIC_ATOMIC64
#include <asm-generic/atomic64.h>
#endif
EOF
grep '^[a-z]' "$1" | while read name meta args; do
gen_proto "${meta}" "${name}" "atomic64" "s64" ${args}
done
cat <<EOF
#endif /* _LINUX_ATOMIC_FALLBACK_H */
EOF
|
