summaryrefslogtreecommitdiffstats
path: root/scripts/atomic/gen-atomic-fallback.sh
blob: f80d69cfeb1fb1273b8ef4d72d439159dd2d1a71 (plain)
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
#!/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 ret="$(gen_ret_type "${meta}" "${int}")"
	local retstmt="$(gen_ret_stmt "${meta}")"
	local params="$(gen_params "${int}" "${atomic}" "$@")"
	local args="$(gen_args "$@")"

	. ${template}
}

#gen_order_fallback(meta, pfx, name, sfx, order, atomic, int, args...)
gen_order_fallback()
{
	local meta="$1"; shift
	local pfx="$1"; shift
	local name="$1"; shift
	local sfx="$1"; shift
	local order="$1"; shift

	local tmpl_order=${order#_}
	local tmpl="${ATOMICDIR}/fallbacks/${tmpl_order:-fence}"
	gen_template_fallback "${tmpl}" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "$@"
}

#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_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, args...)
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"; shift
	local int="$1"; shift

	local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
	local basename="${atomic}_${pfx}${name}${sfx}"

	local template="$(find_fallback_template "${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 "$@")"

	gen_kerneldoc "raw_" "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"

	printf "static __always_inline ${ret}\n"
	printf "raw_${atomicname}(${params})\n"
	printf "{\n"

	# Where there is no possible fallback, this order variant is mandatory
	# and must be provided by arch code. Add a comment to the header to
	# make this obvious.
	#
	# Ideally we'd error on a missing definition, but arch code might
	# define this order variant as a C function without a preprocessor
	# symbol.
	if [ -z ${template} ] && [ -z "${order}" ] && ! meta_has_relaxed "${meta}"; then
		printf "\t${retstmt}arch_${atomicname}(${args});\n"
		printf "}\n\n"
		return
	fi

	printf "#if defined(arch_${atomicname})\n"
	printf "\t${retstmt}arch_${atomicname}(${args});\n"

	# Allow FULL/ACQUIRE/RELEASE ops to be defined in terms of RELAXED ops
	if [ "${order}" != "_relaxed" ] && meta_has_relaxed "${meta}"; then
		printf "#elif defined(arch_${basename}_relaxed)\n"
		gen_order_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
	fi

	# Allow ACQUIRE/RELEASE/RELAXED ops to be defined in terms of FULL ops
	if [ ! -z "${order}" ] && ! meta_is_implicitly_relaxed "${meta}"; then
		printf "#elif defined(arch_${basename})\n"
		printf "\t${retstmt}arch_${basename}(${args});\n"
	fi

	printf "#else\n"
	if [ ! -z "${template}" ]; then
		gen_proto_fallback "${meta}" "${pfx}" "${name}" "${sfx}" "${order}" "${atomic}" "${int}" "$@"
	else
		printf "#error \"Unable to define raw_${atomicname}\"\n"
	fi

	printf "#endif\n"
	printf "}\n\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"

	gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"

	if meta_has_acquire "${meta}"; then
		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
	fi

	if meta_has_release "${meta}"; then
		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
	fi

	if meta_has_relaxed "${meta}"; then
		gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
	fi
}

#gen_basic_fallbacks(basename)
gen_basic_fallbacks()
{
	local basename="$1"; shift
cat << EOF
#define raw_${basename}_acquire arch_${basename}
#define raw_${basename}_release arch_${basename}
#define raw_${basename}_relaxed arch_${basename}
EOF
}

gen_order_fallbacks()
{
	local xchg="$1"; shift

cat <<EOF

#define raw_${xchg}_relaxed arch_${xchg}_relaxed

#ifdef arch_${xchg}_acquire
#define raw_${xchg}_acquire arch_${xchg}_acquire
#else
#define raw_${xchg}_acquire(...) \\
	__atomic_op_acquire(arch_${xchg}, __VA_ARGS__)
#endif

#ifdef arch_${xchg}_release
#define raw_${xchg}_release arch_${xchg}_release
#else
#define raw_${xchg}_release(...) \\
	__atomic_op_release(arch_${xchg}, __VA_ARGS__)
#endif

#ifdef arch_${xchg}
#define raw_${xchg} arch_${xchg}
#else
#define raw_${xchg}(...) \\
	__atomic_op_fence(arch_${xchg}, __VA_ARGS__)
#endif

EOF
}

gen_xchg_order_fallback()
{
	local xchg="$1"; shift
	local order="$1"; shift
	local forder="${order:-_fence}"

	printf "#if defined(arch_${xchg}${order})\n"
	printf "#define raw_${xchg}${order} arch_${xchg}${order}\n"

	if [ "${order}" != "_relaxed" ]; then
		printf "#elif defined(arch_${xchg}_relaxed)\n"
		printf "#define raw_${xchg}${order}(...) \\\\\n"
		printf "	__atomic_op${forder}(arch_${xchg}, __VA_ARGS__)\n"
	fi

	if [ ! -z "${order}" ]; then
		printf "#elif defined(arch_${xchg})\n"
		printf "#define raw_${xchg}${order} arch_${xchg}\n"
	fi

	printf "#else\n"
	printf "extern void raw_${xchg}${order}_not_implemented(void);\n"
	printf "#define raw_${xchg}${order}(...) raw_${xchg}${order}_not_implemented()\n"
	printf "#endif\n\n"
}

gen_xchg_fallbacks()
{
	local xchg="$1"; shift

	for order in "" "_acquire" "_release" "_relaxed"; do
		gen_xchg_order_fallback "${xchg}" "${order}"
	done
}

gen_try_cmpxchg_fallback()
{
	local prefix="$1"; shift
	local cmpxchg="$1"; shift;
	local suffix="$1"; shift;

cat <<EOF
#define raw_${prefix}try_${cmpxchg}${suffix}(_ptr, _oldp, _new) \\
({ \\
	typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \\
	___r = raw_${prefix}${cmpxchg}${suffix}((_ptr), ___o, (_new)); \\
	if (unlikely(___r != ___o)) \\
		*___op = ___r; \\
	likely(___r == ___o); \\
})
EOF
}

gen_try_cmpxchg_order_fallback()
{
	local cmpxchg="$1"; shift
	local order="$1"; shift
	local forder="${order:-_fence}"

	printf "#if defined(arch_try_${cmpxchg}${order})\n"
	printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}${order}\n"

	if [ "${order}" != "_relaxed" ]; then
		printf "#elif defined(arch_try_${cmpxchg}_relaxed)\n"
		printf "#define raw_try_${cmpxchg}${order}(...) \\\\\n"
		printf "	__atomic_op${forder}(arch_try_${cmpxchg}, __VA_ARGS__)\n"
	fi

	if [ ! -z "${order}" ]; then
		printf "#elif defined(arch_try_${cmpxchg})\n"
		printf "#define raw_try_${cmpxchg}${order} arch_try_${cmpxchg}\n"
	fi

	printf "#else\n"
	gen_try_cmpxchg_fallback "" "${cmpxchg}" "${order}"
	printf "#endif\n\n"
}

gen_try_cmpxchg_order_fallbacks()
{
	local cmpxchg="$1"; shift;

	for order in "" "_acquire" "_release" "_relaxed"; do
		gen_try_cmpxchg_order_fallback "${cmpxchg}" "${order}"
	done
}

gen_def_and_try_cmpxchg_fallback()
{
	local prefix="$1"; shift
	local cmpxchg="$1"; shift
	local suffix="$1"; shift

	printf "#define raw_${prefix}${cmpxchg}${suffix} arch_${prefix}${cmpxchg}${suffix}\n\n"
	printf "#ifdef arch_${prefix}try_${cmpxchg}${suffix}\n"
	printf "#define raw_${prefix}try_${cmpxchg}${suffix} arch_${prefix}try_${cmpxchg}${suffix}\n"
	printf "#else\n"
	gen_try_cmpxchg_fallback "${prefix}" "${cmpxchg}" "${suffix}"
	printf "#endif\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 "xchg" "cmpxchg" "cmpxchg64" "cmpxchg128"; do
	gen_xchg_fallbacks "${xchg}"
done

for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
	gen_try_cmpxchg_order_fallbacks "${cmpxchg}"
done

for cmpxchg in "cmpxchg" "cmpxchg64" "cmpxchg128"; do
	gen_def_and_try_cmpxchg_fallback "" "${cmpxchg}" "_local"
done

for cmpxchg in "cmpxchg"; do
	gen_def_and_try_cmpxchg_fallback "sync_" "${cmpxchg}" ""
done

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