| | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| | 2 | #ifndef _ASM_X86_PERCPU_H |
| | 3 | #define _ASM_X86_PERCPU_H |
| | 4 | |
| | 5 | #ifdef CONFIG_X86_64 |
| | 6 | # define __percpu_seg gs |
| | 7 | # define __percpu_rel (%rip) |
| | 8 | #else |
| | 9 | # define __percpu_seg fs |
| | 10 | # define __percpu_rel |
| | 11 | #endif |
| | 12 | |
| | 13 | #ifdef __ASSEMBLER__ |
| | 14 | |
| | 15 | #ifdef CONFIG_SMP |
| | 16 | # define __percpu %__percpu_seg: |
| | 17 | #else |
| | 18 | # define __percpu |
| | 19 | #endif |
| | 20 | |
| | 21 | #define PER_CPU_VAR(var) __percpu(var)__percpu_rel |
| | 22 | |
| | 23 | #else /* !__ASSEMBLY__: */ |
| | 24 | |
| | 25 | #include <linux/args.h> |
| | 26 | #include <linux/build_bug.h> |
| | 27 | #include <linux/stringify.h> |
| | 28 | #include <asm/asm.h> |
| | 29 | |
| | 30 | #ifdef CONFIG_SMP |
| | 31 | |
| | 32 | #define __force_percpu_prefix "%%"__stringify(__percpu_seg)":" |
| | 33 | |
| | 34 | #ifdef CONFIG_CC_HAS_NAMED_AS |
| | 35 | |
| | 36 | #ifdef __CHECKER__ |
| | 37 | # define __seg_gs __attribute__((address_space(__seg_gs))) |
| | 38 | # define __seg_fs __attribute__((address_space(__seg_fs))) |
| | 39 | #endif |
| | 40 | |
| | 41 | #define __percpu_prefix |
| | 42 | #define __percpu_seg_override CONCATENATE(__seg_, __percpu_seg) |
| | 43 | |
| | 44 | #else /* !CONFIG_CC_HAS_NAMED_AS: */ |
| | 45 | |
| | 46 | #define __percpu_prefix __force_percpu_prefix |
| | 47 | #define __percpu_seg_override |
| | 48 | |
| | 49 | #endif /* CONFIG_CC_HAS_NAMED_AS */ |
| | 50 | |
| | 51 | /* |
| | 52 | * Compared to the generic __my_cpu_offset version, the following |
| | 53 | * saves one instruction and avoids clobbering a temp register. |
| | 54 | */ |
| | 55 | #define __my_cpu_offset this_cpu_read(this_cpu_off) |
| | 56 | |
| | 57 | /* |
| | 58 | * arch_raw_cpu_ptr should not be used in 32-bit VDSO for a 64-bit |
| | 59 | * kernel, because games are played with CONFIG_X86_64 there and |
| | 60 | * sizeof(this_cpu_off) becames 4. |
| | 61 | */ |
| | 62 | #ifndef BUILD_VDSO32_64 |
| | 63 | #define arch_raw_cpu_ptr(_ptr) \ |
| | 64 | ({ \ |
| | 65 | unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \ |
| | 66 | \ |
| | 67 | tcp_ptr__ += (__force unsigned long)(_ptr); \ |
| | 68 | (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__; \ |
| | 69 | }) |
| | 70 | #else |
| | 71 | #define arch_raw_cpu_ptr(_ptr) \ |
| | 72 | ({ \ |
| | 73 | BUILD_BUG(); \ |
| | 74 | (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)0; \ |
| | 75 | }) |
| | 76 | #endif |
| | 77 | |
| | 78 | #define PER_CPU_VAR(var) %__percpu_seg:(var)__percpu_rel |
| | 79 | |
| | 80 | #else /* !CONFIG_SMP: */ |
| | 81 | |
| | 82 | #define __force_percpu_prefix |
| | 83 | #define __percpu_prefix |
| | 84 | #define __percpu_seg_override |
| | 85 | |
| | 86 | #define PER_CPU_VAR(var) (var)__percpu_rel |
| | 87 | |
| | 88 | #endif /* CONFIG_SMP */ |
| | 89 | |
| | 90 | #if defined(CONFIG_USE_X86_SEG_SUPPORT) && defined(USE_TYPEOF_UNQUAL) |
| | 91 | # define __my_cpu_type(var) typeof(var) |
| | 92 | # define __my_cpu_ptr(ptr) (ptr) |
| | 93 | # define __my_cpu_var(var) (var) |
| | 94 | |
| | 95 | # define __percpu_qual __percpu_seg_override |
| | 96 | #else |
| | 97 | # define __my_cpu_type(var) typeof(var) __percpu_seg_override |
| | 98 | # define __my_cpu_ptr(ptr) (__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr) |
| | 99 | # define __my_cpu_var(var) (*__my_cpu_ptr(&(var))) |
| | 100 | #endif |
| | 101 | |
| | 102 | #define __force_percpu_arg(x) __force_percpu_prefix "%" #x |
| | 103 | #define __percpu_arg(x) __percpu_prefix "%" #x |
| | 104 | |
| | 105 | /* |
| | 106 | * For arch-specific code, we can use direct single-insn ops (they |
| | 107 | * don't give an lvalue though). |
| | 108 | */ |
| | 109 | |
| | 110 | #define __pcpu_type_1 u8 |
| | 111 | #define __pcpu_type_2 u16 |
| | 112 | #define __pcpu_type_4 u32 |
| | 113 | #define __pcpu_type_8 u64 |
| | 114 | |
| | 115 | #define __pcpu_cast_1(val) ((u8)(((unsigned long) val) & 0xff)) |
| | 116 | #define __pcpu_cast_2(val) ((u16)(((unsigned long) val) & 0xffff)) |
| | 117 | #define __pcpu_cast_4(val) ((u32)(((unsigned long) val) & 0xffffffff)) |
| | 118 | #define __pcpu_cast_8(val) ((u64)(val)) |
| | 119 | |
| | 120 | #define __pcpu_op_1(op) op "b " |
| | 121 | #define __pcpu_op_2(op) op "w " |
| | 122 | #define __pcpu_op_4(op) op "l " |
| | 123 | #define __pcpu_op_8(op) op "q " |
| | 124 | |
| | 125 | #define __pcpu_reg_1(mod, x) mod "q" (x) |
| | 126 | #define __pcpu_reg_2(mod, x) mod "r" (x) |
| | 127 | #define __pcpu_reg_4(mod, x) mod "r" (x) |
| | 128 | #define __pcpu_reg_8(mod, x) mod "r" (x) |
| | 129 | |
| | 130 | #define __pcpu_reg_imm_1(x) "qi" (x) |
| | 131 | #define __pcpu_reg_imm_2(x) "ri" (x) |
| | 132 | #define __pcpu_reg_imm_4(x) "ri" (x) |
| | 133 | #define __pcpu_reg_imm_8(x) "re" (x) |
| | 134 | |
| | 135 | #ifdef CONFIG_USE_X86_SEG_SUPPORT |
| | 136 | |
| | 137 | #define __raw_cpu_read(size, qual, pcp) \ |
| | 138 | ({ \ |
| | 139 | *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)); \ |
| | 140 | }) |
| | 141 | |
| | 142 | #define __raw_cpu_write(size, qual, pcp, val) \ |
| | 143 | do { \ |
| | 144 | *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \ |
| | 145 | } while (0) |
| | 146 | |
| | 147 | #define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp) |
| | 148 | |
| | 149 | #else /* !CONFIG_USE_X86_SEG_SUPPORT: */ |
| | 150 | |
| | 151 | #define __raw_cpu_read(size, qual, _var) \ |
| | 152 | ({ \ |
| | 153 | __pcpu_type_##size pfo_val__; \ |
| | 154 | \ |
| | 155 | asm qual (__pcpu_op_##size("mov") \ |
| | 156 | __percpu_arg([var]) ", %[val]" \ |
| | 157 | : [val] __pcpu_reg_##size("=", pfo_val__) \ |
| | 158 | : [var] "m" (__my_cpu_var(_var))); \ |
| | 159 | \ |
| | 160 | (typeof(_var))(unsigned long) pfo_val__; \ |
| | 161 | }) |
| | 162 | |
| | 163 | #define __raw_cpu_write(size, qual, _var, _val) \ |
| | 164 | do { \ |
| | 165 | __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \ |
| | 166 | \ |
| | 167 | if (0) { \ |
| | 168 | TYPEOF_UNQUAL(_var) pto_tmp__; \ |
| | 169 | pto_tmp__ = (_val); \ |
| | 170 | (void)pto_tmp__; \ |
| | 171 | } \ |
| | 172 | asm qual (__pcpu_op_##size("mov") "%[val], " \ |
| | 173 | __percpu_arg([var]) \ |
| | 174 | : [var] "=m" (__my_cpu_var(_var)) \ |
| | 175 | : [val] __pcpu_reg_imm_##size(pto_val__)); \ |
| | 176 | } while (0) |
| | 177 | |
| | 178 | /* |
| | 179 | * The generic per-CPU infrastrucutre is not suitable for |
| | 180 | * reading const-qualified variables. |
| | 181 | */ |
| | 182 | #define __raw_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) |
| | 183 | |
| | 184 | #endif /* CONFIG_USE_X86_SEG_SUPPORT */ |
| | 185 | |
| | 186 | #define __raw_cpu_read_stable(size, _var) \ |
| | 187 | ({ \ |
| | 188 | __pcpu_type_##size pfo_val__; \ |
| | 189 | \ |
| | 190 | asm(__pcpu_op_##size("mov") \ |
| | 191 | __force_percpu_arg(a[var]) ", %[val]" \ |
| | 192 | : [val] __pcpu_reg_##size("=", pfo_val__) \ |
| | 193 | : [var] "i" (&(_var))); \ |
| | 194 | \ |
| | 195 | (typeof(_var))(unsigned long) pfo_val__; \ |
| | 196 | }) |
| | 197 | |
| | 198 | #define percpu_unary_op(size, qual, op, _var) \ |
| | 199 | ({ \ |
| | 200 | asm qual (__pcpu_op_##size(op) __percpu_arg([var]) \ |
| | 201 | : [var] "+m" (__my_cpu_var(_var))); \ |
| | 202 | }) |
| | 203 | |
| | 204 | #define percpu_binary_op(size, qual, op, _var, _val) \ |
| | 205 | do { \ |
| | 206 | __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \ |
| | 207 | \ |
| | 208 | if (0) { \ |
| | 209 | TYPEOF_UNQUAL(_var) pto_tmp__; \ |
| | 210 | pto_tmp__ = (_val); \ |
| | 211 | (void)pto_tmp__; \ |
| | 212 | } \ |
| | 213 | asm qual (__pcpu_op_##size(op) "%[val], " __percpu_arg([var]) \ |
| | 214 | : [var] "+m" (__my_cpu_var(_var)) \ |
| | 215 | : [val] __pcpu_reg_imm_##size(pto_val__)); \ |
| | 216 | } while (0) |
| | 217 | |
| | 218 | /* |
| | 219 | * Generate a per-CPU add to memory instruction and optimize code |
| | 220 | * if one is added or subtracted. |
| | 221 | */ |
| | 222 | #define percpu_add_op(size, qual, var, val) \ |
| | 223 | do { \ |
| | 224 | const int pao_ID__ = \ |
| | 225 | (__builtin_constant_p(val) && \ |
| | 226 | ((val) == 1 || \ |
| | 227 | (val) == (typeof(val))-1)) ? (int)(val) : 0; \ |
| | 228 | \ |
| | 229 | if (0) { \ |
| | 230 | TYPEOF_UNQUAL(var) pao_tmp__; \ |
| | 231 | pao_tmp__ = (val); \ |
| | 232 | (void)pao_tmp__; \ |
| | 233 | } \ |
| | 234 | if (pao_ID__ == 1) \ |
| | 235 | percpu_unary_op(size, qual, "inc", var); \ |
| | 236 | else if (pao_ID__ == -1) \ |
| | 237 | percpu_unary_op(size, qual, "dec", var); \ |
| | 238 | else \ |
| | 239 | percpu_binary_op(size, qual, "add", var, val); \ |
| | 240 | } while (0) |
| | 241 | |
| | 242 | /* |
| | 243 | * Add return operation |
| | 244 | */ |
| | 245 | #define percpu_add_return_op(size, qual, _var, _val) \ |
| | 246 | ({ \ |
| | 247 | __pcpu_type_##size paro_tmp__ = __pcpu_cast_##size(_val); \ |
| | 248 | \ |
| | 249 | asm qual (__pcpu_op_##size("xadd") "%[tmp], " \ |
| | 250 | __percpu_arg([var]) \ |
| | 251 | : [tmp] __pcpu_reg_##size("+", paro_tmp__), \ |
| | 252 | [var] "+m" (__my_cpu_var(_var)) \ |
| | 253 | : : "memory"); \ |
| | 254 | (typeof(_var))(unsigned long) (paro_tmp__ + _val); \ |
| | 255 | }) |
| | 256 | |
| | 257 | /* |
| | 258 | * raw_cpu_xchg() can use a load-store since |
| | 259 | * it is not required to be IRQ-safe. |
| | 260 | */ |
| | 261 | #define raw_percpu_xchg_op(_var, _nval) \ |
| | 262 | ({ \ |
| | 263 | TYPEOF_UNQUAL(_var) pxo_old__ = raw_cpu_read(_var); \ |
| | 264 | \ |
| | 265 | raw_cpu_write(_var, _nval); \ |
| | 266 | \ |
| | 267 | pxo_old__; \ |
| | 268 | }) |
| | 269 | |
| | 270 | /* |
| | 271 | * this_cpu_xchg() is implemented using CMPXCHG without a LOCK prefix. |
| | 272 | * XCHG is expensive due to the implied LOCK prefix. The processor |
| | 273 | * cannot prefetch cachelines if XCHG is used. |
| | 274 | */ |
| | 275 | #define this_percpu_xchg_op(_var, _nval) \ |
| | 276 | ({ \ |
| | 277 | TYPEOF_UNQUAL(_var) pxo_old__ = this_cpu_read(_var); \ |
| | 278 | \ |
| | 279 | do { } while (!this_cpu_try_cmpxchg(_var, &pxo_old__, _nval)); \ |
| | 280 | \ |
| | 281 | pxo_old__; \ |
| | 282 | }) |
| | 283 | |
| | 284 | /* |
| | 285 | * CMPXCHG has no such implied lock semantics as a result it is much |
| | 286 | * more efficient for CPU-local operations. |
| | 287 | */ |
| | 288 | #define percpu_cmpxchg_op(size, qual, _var, _oval, _nval) \ |
| | 289 | ({ \ |
| | 290 | __pcpu_type_##size pco_old__ = __pcpu_cast_##size(_oval); \ |
| | 291 | __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \ |
| | 292 | \ |
| | 293 | asm qual (__pcpu_op_##size("cmpxchg") "%[nval], " \ |
| | 294 | __percpu_arg([var]) \ |
| | 295 | : [oval] "+a" (pco_old__), \ |
| | 296 | [var] "+m" (__my_cpu_var(_var)) \ |
| | 297 | : [nval] __pcpu_reg_##size(, pco_new__) \ |
| | 298 | : "memory"); \ |
| | 299 | \ |
| | 300 | (typeof(_var))(unsigned long) pco_old__; \ |
| | 301 | }) |
| | 302 | |
| | 303 | #define percpu_try_cmpxchg_op(size, qual, _var, _ovalp, _nval) \ |
| | 304 | ({ \ |
| | 305 | bool success; \ |
| | 306 | __pcpu_type_##size *pco_oval__ = (__pcpu_type_##size *)(_ovalp); \ |
| | 307 | __pcpu_type_##size pco_old__ = *pco_oval__; \ |
| | 308 | __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \ |
| | 309 | \ |
| | 310 | asm qual (__pcpu_op_##size("cmpxchg") "%[nval], " \ |
| | 311 | __percpu_arg([var]) \ |
| | 312 | CC_SET(z) \ |
| | 313 | : CC_OUT(z) (success), \ |
| | 314 | [oval] "+a" (pco_old__), \ |
| | 315 | [var] "+m" (__my_cpu_var(_var)) \ |
| | 316 | : [nval] __pcpu_reg_##size(, pco_new__) \ |
| | 317 | : "memory"); \ |
| | 318 | if (unlikely(!success)) \ |
| | 319 | *pco_oval__ = pco_old__; \ |
| | 320 | \ |
| | 321 | likely(success); \ |
| | 322 | }) |
| | 323 | |
| | 324 | #if defined(CONFIG_X86_32) && !defined(CONFIG_UML) |
| | 325 | |
| | 326 | #define percpu_cmpxchg64_op(size, qual, _var, _oval, _nval) \ |
| | 327 | ({ \ |
| | 328 | union { \ |
| | 329 | u64 var; \ |
| | 330 | struct { \ |
| | 331 | u32 low, high; \ |
| | 332 | }; \ |
| | 333 | } old__, new__; \ |
| | 334 | \ |
| | 335 | old__.var = _oval; \ |
| | 336 | new__.var = _nval; \ |
| | 337 | \ |
| | 338 | asm_inline qual ( \ |
| | 339 | ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \ |
| | 340 | "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ |
| | 341 | : ALT_OUTPUT_SP([var] "+m" (__my_cpu_var(_var)), \ |
| | 342 | "+a" (old__.low), "+d" (old__.high)) \ |
| | 343 | : "b" (new__.low), "c" (new__.high), \ |
| | 344 | "S" (&(_var)) \ |
| | 345 | : "memory"); \ |
| | 346 | \ |
| | 347 | old__.var; \ |
| | 348 | }) |
| | 349 | |
| | 350 | #define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, , pcp, oval, nval) |
| | 351 | #define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, volatile, pcp, oval, nval) |
| | 352 | |
| | 353 | #define percpu_try_cmpxchg64_op(size, qual, _var, _ovalp, _nval) \ |
| | 354 | ({ \ |
| | 355 | bool success; \ |
| | 356 | u64 *_oval = (u64 *)(_ovalp); \ |
| | 357 | union { \ |
| | 358 | u64 var; \ |
| | 359 | struct { \ |
| | 360 | u32 low, high; \ |
| | 361 | }; \ |
| | 362 | } old__, new__; \ |
| | 363 | \ |
| | 364 | old__.var = *_oval; \ |
| | 365 | new__.var = _nval; \ |
| | 366 | \ |
| | 367 | asm_inline qual ( \ |
| | 368 | ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \ |
| | 369 | "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ |
| | 370 | CC_SET(z) \ |
| | 371 | : ALT_OUTPUT_SP(CC_OUT(z) (success), \ |
| | 372 | [var] "+m" (__my_cpu_var(_var)), \ |
| | 373 | "+a" (old__.low), "+d" (old__.high)) \ |
| | 374 | : "b" (new__.low), "c" (new__.high), \ |
| | 375 | "S" (&(_var)) \ |
| | 376 | : "memory"); \ |
| | 377 | if (unlikely(!success)) \ |
| | 378 | *_oval = old__.var; \ |
| | 379 | \ |
| | 380 | likely(success); \ |
| | 381 | }) |
| | 382 | |
| | 383 | #define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, , pcp, ovalp, nval) |
| | 384 | #define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, volatile, pcp, ovalp, nval) |
| | 385 | |
| | 386 | #endif /* defined(CONFIG_X86_32) && !defined(CONFIG_UML) */ |
| | 387 | |
| | 388 | #ifdef CONFIG_X86_64 |
| | 389 | #define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval); |
| | 390 | #define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval); |
| | 391 | |
| | 392 | #define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval); |
| | 393 | #define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval); |
| | 394 | |
| | 395 | #define percpu_cmpxchg128_op(size, qual, _var, _oval, _nval) \ |
| | 396 | ({ \ |
| | 397 | union { \ |
| | 398 | u128 var; \ |
| | 399 | struct { \ |
| | 400 | u64 low, high; \ |
| | 401 | }; \ |
| | 402 | } old__, new__; \ |
| | 403 | \ |
| | 404 | old__.var = _oval; \ |
| | 405 | new__.var = _nval; \ |
| | 406 | \ |
| | 407 | asm_inline qual ( \ |
| | 408 | ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \ |
| | 409 | "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ |
| | 410 | : ALT_OUTPUT_SP([var] "+m" (__my_cpu_var(_var)), \ |
| | 411 | "+a" (old__.low), "+d" (old__.high)) \ |
| | 412 | : "b" (new__.low), "c" (new__.high), \ |
| | 413 | "S" (&(_var)) \ |
| | 414 | : "memory"); \ |
| | 415 | \ |
| | 416 | old__.var; \ |
| | 417 | }) |
| | 418 | |
| | 419 | #define raw_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, , pcp, oval, nval) |
| | 420 | #define this_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, volatile, pcp, oval, nval) |
| | 421 | |
| | 422 | #define percpu_try_cmpxchg128_op(size, qual, _var, _ovalp, _nval) \ |
| | 423 | ({ \ |
| | 424 | bool success; \ |
| | 425 | u128 *_oval = (u128 *)(_ovalp); \ |
| | 426 | union { \ |
| | 427 | u128 var; \ |
| | 428 | struct { \ |
| | 429 | u64 low, high; \ |
| | 430 | }; \ |
| | 431 | } old__, new__; \ |
| | 432 | \ |
| | 433 | old__.var = *_oval; \ |
| | 434 | new__.var = _nval; \ |
| | 435 | \ |
| | 436 | asm_inline qual ( \ |
| | 437 | ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \ |
| | 438 | "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ |
| | 439 | CC_SET(z) \ |
| | 440 | : ALT_OUTPUT_SP(CC_OUT(z) (success), \ |
| | 441 | [var] "+m" (__my_cpu_var(_var)), \ |
| | 442 | "+a" (old__.low), "+d" (old__.high)) \ |
| | 443 | : "b" (new__.low), "c" (new__.high), \ |
| | 444 | "S" (&(_var)) \ |
| | 445 | : "memory"); \ |
| | 446 | if (unlikely(!success)) \ |
| | 447 | *_oval = old__.var; \ |
| | 448 | \ |
| | 449 | likely(success); \ |
| | 450 | }) |
| | 451 | |
| | 452 | #define raw_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, , pcp, ovalp, nval) |
| | 453 | #define this_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval) |
| | 454 | |
| | 455 | #endif /* CONFIG_X86_64 */ |
| | 456 | |
| | 457 | #define raw_cpu_read_1(pcp) __raw_cpu_read(1, , pcp) |
| | 458 | #define raw_cpu_read_2(pcp) __raw_cpu_read(2, , pcp) |
| | 459 | #define raw_cpu_read_4(pcp) __raw_cpu_read(4, , pcp) |
| | 460 | #define raw_cpu_write_1(pcp, val) __raw_cpu_write(1, , pcp, val) |
| | 461 | #define raw_cpu_write_2(pcp, val) __raw_cpu_write(2, , pcp, val) |
| | 462 | #define raw_cpu_write_4(pcp, val) __raw_cpu_write(4, , pcp, val) |
| | 463 | |
| | 464 | #define this_cpu_read_1(pcp) __raw_cpu_read(1, volatile, pcp) |
| | 465 | #define this_cpu_read_2(pcp) __raw_cpu_read(2, volatile, pcp) |
| | 466 | #define this_cpu_read_4(pcp) __raw_cpu_read(4, volatile, pcp) |
| | 467 | #define this_cpu_write_1(pcp, val) __raw_cpu_write(1, volatile, pcp, val) |
| | 468 | #define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val) |
| | 469 | #define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val) |
| | 470 | |
| | 471 | #define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp) |
| | 472 | #define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp) |
| | 473 | #define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp) |
| | 474 | |
| | 475 | #define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val) |
| | 476 | #define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val) |
| | 477 | #define raw_cpu_add_4(pcp, val) percpu_add_op(4, , (pcp), val) |
| | 478 | #define raw_cpu_and_1(pcp, val) percpu_binary_op(1, , "and", (pcp), val) |
| | 479 | #define raw_cpu_and_2(pcp, val) percpu_binary_op(2, , "and", (pcp), val) |
| | 480 | #define raw_cpu_and_4(pcp, val) percpu_binary_op(4, , "and", (pcp), val) |
| | 481 | #define raw_cpu_or_1(pcp, val) percpu_binary_op(1, , "or", (pcp), val) |
| | 482 | #define raw_cpu_or_2(pcp, val) percpu_binary_op(2, , "or", (pcp), val) |
| | 483 | #define raw_cpu_or_4(pcp, val) percpu_binary_op(4, , "or", (pcp), val) |
| | 484 | #define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val) |
| | 485 | #define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val) |
| | 486 | #define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val) |
| | 487 | |
| | 488 | #define this_cpu_add_1(pcp, val) percpu_add_op(1, volatile, (pcp), val) |
| | 489 | #define this_cpu_add_2(pcp, val) percpu_add_op(2, volatile, (pcp), val) |
| | 490 | #define this_cpu_add_4(pcp, val) percpu_add_op(4, volatile, (pcp), val) |
| | 491 | #define this_cpu_and_1(pcp, val) percpu_binary_op(1, volatile, "and", (pcp), val) |
| | 492 | #define this_cpu_and_2(pcp, val) percpu_binary_op(2, volatile, "and", (pcp), val) |
| | 493 | #define this_cpu_and_4(pcp, val) percpu_binary_op(4, volatile, "and", (pcp), val) |
| | 494 | #define this_cpu_or_1(pcp, val) percpu_binary_op(1, volatile, "or", (pcp), val) |
| | 495 | #define this_cpu_or_2(pcp, val) percpu_binary_op(2, volatile, "or", (pcp), val) |
| | 496 | #define this_cpu_or_4(pcp, val) percpu_binary_op(4, volatile, "or", (pcp), val) |
| | 497 | #define this_cpu_xchg_1(pcp, nval) this_percpu_xchg_op(pcp, nval) |
| | 498 | #define this_cpu_xchg_2(pcp, nval) this_percpu_xchg_op(pcp, nval) |
| | 499 | #define this_cpu_xchg_4(pcp, nval) this_percpu_xchg_op(pcp, nval) |
| | 500 | |
| | 501 | #define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(1, , pcp, val) |
| | 502 | #define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(2, , pcp, val) |
| | 503 | #define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(4, , pcp, val) |
| | 504 | #define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, , pcp, oval, nval) |
| | 505 | #define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, , pcp, oval, nval) |
| | 506 | #define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, , pcp, oval, nval) |
| | 507 | #define raw_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, , pcp, ovalp, nval) |
| | 508 | #define raw_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, , pcp, ovalp, nval) |
| | 509 | #define raw_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, , pcp, ovalp, nval) |
| | 510 | |
| | 511 | #define this_cpu_add_return_1(pcp, val) percpu_add_return_op(1, volatile, pcp, val) |
| | 512 | #define this_cpu_add_return_2(pcp, val) percpu_add_return_op(2, volatile, pcp, val) |
| | 513 | #define this_cpu_add_return_4(pcp, val) percpu_add_return_op(4, volatile, pcp, val) |
| | 514 | #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, volatile, pcp, oval, nval) |
| | 515 | #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, volatile, pcp, oval, nval) |
| | 516 | #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, volatile, pcp, oval, nval) |
| | 517 | #define this_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, volatile, pcp, ovalp, nval) |
| | 518 | #define this_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, volatile, pcp, ovalp, nval) |
| | 519 | #define this_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, volatile, pcp, ovalp, nval) |
| | 520 | |
| | 521 | /* |
| | 522 | * Per-CPU atomic 64-bit operations are only available under 64-bit kernels. |
| | 523 | * 32-bit kernels must fall back to generic operations. |
| | 524 | */ |
| | 525 | #ifdef CONFIG_X86_64 |
| | 526 | |
| | 527 | #define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp) |
| | 528 | #define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val) |
| | 529 | |
| | 530 | #define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp) |
| | 531 | #define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val) |
| | 532 | |
| | 533 | #define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp) |
| | 534 | |
| | 535 | #define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val) |
| | 536 | #define raw_cpu_and_8(pcp, val) percpu_binary_op(8, , "and", (pcp), val) |
| | 537 | #define raw_cpu_or_8(pcp, val) percpu_binary_op(8, , "or", (pcp), val) |
| | 538 | #define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(8, , pcp, val) |
| | 539 | #define raw_cpu_xchg_8(pcp, nval) raw_percpu_xchg_op(pcp, nval) |
| | 540 | #define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval) |
| | 541 | #define raw_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval) |
| | 542 | |
| | 543 | #define this_cpu_add_8(pcp, val) percpu_add_op(8, volatile, (pcp), val) |
| | 544 | #define this_cpu_and_8(pcp, val) percpu_binary_op(8, volatile, "and", (pcp), val) |
| | 545 | #define this_cpu_or_8(pcp, val) percpu_binary_op(8, volatile, "or", (pcp), val) |
| | 546 | #define this_cpu_add_return_8(pcp, val) percpu_add_return_op(8, volatile, pcp, val) |
| | 547 | #define this_cpu_xchg_8(pcp, nval) this_percpu_xchg_op(pcp, nval) |
| | 548 | #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval) |
| | 549 | #define this_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval) |
| | 550 | |
| | 551 | #define raw_cpu_read_long(pcp) raw_cpu_read_8(pcp) |
| | 552 | |
| | 553 | #else /* !CONFIG_X86_64: */ |
| | 554 | |
| | 555 | /* There is no generic 64-bit read stable operation for 32-bit targets. */ |
| | 556 | #define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) |
| | 557 | |
| | 558 | #define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp) |
| | 559 | |
| | 560 | #endif /* CONFIG_X86_64 */ |
| | 561 | |
| | 562 | #define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp) |
| | 563 | |
| | 564 | /* |
| | 565 | * this_cpu_read() makes the compiler load the per-CPU variable every time |
| | 566 | * it is accessed while this_cpu_read_stable() allows the value to be cached. |
| | 567 | * this_cpu_read_stable() is more efficient and can be used if its value |
| | 568 | * is guaranteed to be valid across CPUs. The current users include |
| | 569 | * current_task and cpu_current_top_of_stack, both of which are |
| | 570 | * actually per-thread variables implemented as per-CPU variables and |
| | 571 | * thus stable for the duration of the respective task. |
| | 572 | */ |
| | 573 | #define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp) |
| | 574 | |
| | 575 | #define x86_this_cpu_constant_test_bit(_nr, _var) \ |
| | 576 | ({ \ |
| | 577 | unsigned long __percpu *addr__ = \ |
| | 578 | (unsigned long __percpu *)&(_var) + ((_nr) / BITS_PER_LONG); \ |
| | 579 | \ |
| | 580 | !!((1UL << ((_nr) % BITS_PER_LONG)) & raw_cpu_read(*addr__)); \ |
| | 581 | }) |
| | 582 | |
| | 583 | #define x86_this_cpu_variable_test_bit(_nr, _var) \ |
| | 584 | ({ \ |
| | 585 | bool oldbit; \ |
| | 586 | \ |
| | 587 | asm volatile("btl %[nr], " __percpu_arg([var]) \ |
| | 588 | CC_SET(c) \ |
| | 589 | : CC_OUT(c) (oldbit) \ |
| | 590 | : [var] "m" (__my_cpu_var(_var)), \ |
| | 591 | [nr] "rI" (_nr)); \ |
| | 592 | oldbit; \ |
| | 593 | }) |
| | 594 | |
| | 595 | #define x86_this_cpu_test_bit(_nr, _var) \ |
| | 596 | (__builtin_constant_p(_nr) \ |
| | 597 | ? x86_this_cpu_constant_test_bit(_nr, _var) \ |
| | 598 | : x86_this_cpu_variable_test_bit(_nr, _var)) |
| | 599 | |
| | 600 | |
| | 601 | #include <asm-generic/percpu.h> |
| | 602 | |
| | 603 | /* We can use this directly for local CPU (faster). */ |
| | 604 | DECLARE_PER_CPU_CACHE_HOT(unsigned long, this_cpu_off); |
| | 605 | |
| | 606 | #endif /* !__ASSEMBLER__ */ |
| | 607 | |
| | 608 | #ifdef CONFIG_SMP |
| | 609 | |
| | 610 | /* |
| | 611 | * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu |
| | 612 | * variables that are initialized and accessed before there are per_cpu |
| | 613 | * areas allocated. |
| | 614 | */ |
| | 615 | |
| | 616 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ |
| | 617 | DEFINE_PER_CPU(_type, _name) = _initvalue; \ |
| | 618 | __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ |
| | 619 | { [0 ... NR_CPUS-1] = _initvalue }; \ |
| | 620 | __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map |
| | 621 | |
| | 622 | #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ |
| | 623 | DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \ |
| | 624 | __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ |
| | 625 | { [0 ... NR_CPUS-1] = _initvalue }; \ |
| | 626 | __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map |
| | 627 | |
| | 628 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ |
| | 629 | EXPORT_PER_CPU_SYMBOL(_name) |
| | 630 | |
| | 631 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ |
| | 632 | DECLARE_PER_CPU(_type, _name); \ |
| | 633 | extern __typeof__(_type) *_name##_early_ptr; \ |
| | 634 | extern __typeof__(_type) _name##_early_map[] |
| | 635 | |
| | 636 | #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ |
| | 637 | DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \ |
| | 638 | extern __typeof__(_type) *_name##_early_ptr; \ |
| | 639 | extern __typeof__(_type) _name##_early_map[] |
| | 640 | |
| | 641 | #define early_per_cpu_ptr(_name) (_name##_early_ptr) |
| | 642 | #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) |
| | 643 | |
| | 644 | #define early_per_cpu(_name, _cpu) \ |
| | 645 | *(early_per_cpu_ptr(_name) ? \ |
| | 646 | &early_per_cpu_ptr(_name)[_cpu] : \ |
| | 647 | &per_cpu(_name, _cpu)) |
| | 648 | |
| | 649 | #else /* !CONFIG_SMP: */ |
| | 650 | #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ |
| | 651 | DEFINE_PER_CPU(_type, _name) = _initvalue |
| | 652 | |
| | 653 | #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ |
| | 654 | DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue |
| | 655 | |
| | 656 | #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ |
| | 657 | EXPORT_PER_CPU_SYMBOL(_name) |
| | 658 | |
| | 659 | #define DECLARE_EARLY_PER_CPU(_type, _name) \ |
| | 660 | DECLARE_PER_CPU(_type, _name) |
| | 661 | |
| | 662 | #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ |
| | 663 | DECLARE_PER_CPU_READ_MOSTLY(_type, _name) |
| | 664 | |
| | 665 | #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) |
| | 666 | #define early_per_cpu_ptr(_name) NULL |
| | 667 | /* no early_per_cpu_map() */ |
| | 668 | |
| | 669 | #endif /* !CONFIG_SMP */ |
| | 670 | |
| | 671 | #endif /* _ASM_X86_PERCPU_H */ |
projects / linux-2.6-block.git / blame_incremental