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 __ASSEMBLY__ 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 #ifdef CONFIG_X86_64_SMP 24 # define INIT_PER_CPU_VAR(var) init_per_cpu__##var 25 #else 26 # define INIT_PER_CPU_VAR(var) var 27 #endif 28 29 #else /* !__ASSEMBLY__: */ 30 31 #include <linux/build_bug.h> 32 #include <linux/stringify.h> 33 #include <asm/asm.h> 34 35 #ifdef CONFIG_SMP 36 37 #ifdef CONFIG_CC_HAS_NAMED_AS 38 39 #ifdef __CHECKER__ 40 # define __seg_gs __attribute__((address_space(__seg_gs))) 41 # define __seg_fs __attribute__((address_space(__seg_fs))) 42 #endif 43 44 #ifdef CONFIG_X86_64 45 # define __percpu_seg_override __seg_gs 46 #else 47 # define __percpu_seg_override __seg_fs 48 #endif 49 50 #define __percpu_prefix "" 51 52 #else /* !CONFIG_CC_HAS_NAMED_AS: */ 53 54 #define __percpu_seg_override 55 #define __percpu_prefix "%%"__stringify(__percpu_seg)":" 56 57 #endif /* CONFIG_CC_HAS_NAMED_AS */ 58 59 #define __force_percpu_prefix "%%"__stringify(__percpu_seg)":" 60 #define __my_cpu_offset this_cpu_read(this_cpu_off) 61 62 /* 63 * Compared to the generic __my_cpu_offset version, the following 64 * saves one instruction and avoids clobbering a temp register. 65 * 66 * arch_raw_cpu_ptr should not be used in 32-bit VDSO for a 64-bit 67 * kernel, because games are played with CONFIG_X86_64 there and 68 * sizeof(this_cpu_off) becames 4. 69 */ 70 #ifndef BUILD_VDSO32_64 71 #define arch_raw_cpu_ptr(_ptr) \ 72 ({ \ 73 unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \ 74 \ 75 tcp_ptr__ += (__force unsigned long)(_ptr); \ 76 (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__; \ 77 }) 78 #else 79 #define arch_raw_cpu_ptr(_ptr) \ 80 ({ \ 81 BUILD_BUG(); \ 82 (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)0; \ 83 }) 84 #endif 85 86 #define PER_CPU_VAR(var) %__percpu_seg:(var)__percpu_rel 87 88 #else /* !CONFIG_SMP: */ 89 90 #define __percpu_seg_override 91 #define __percpu_prefix "" 92 #define __force_percpu_prefix "" 93 94 #define PER_CPU_VAR(var) (var)__percpu_rel 95 96 #endif /* CONFIG_SMP */ 97 98 #if defined(CONFIG_USE_X86_SEG_SUPPORT) && defined(USE_TYPEOF_UNQUAL) 99 # define __my_cpu_type(var) typeof(var) 100 # define __my_cpu_ptr(ptr) (ptr) 101 # define __my_cpu_var(var) (var) 102 103 # define __percpu_qual __percpu_seg_override 104 #else 105 # define __my_cpu_type(var) typeof(var) __percpu_seg_override 106 # define __my_cpu_ptr(ptr) (__my_cpu_type(*(ptr))*)(__force uintptr_t)(ptr) 107 # define __my_cpu_var(var) (*__my_cpu_ptr(&(var))) 108 #endif 109 110 #define __percpu_arg(x) __percpu_prefix "%" #x 111 #define __force_percpu_arg(x) __force_percpu_prefix "%" #x 112 113 /* 114 * Initialized pointers to per-CPU variables needed for the boot 115 * processor need to use these macros to get the proper address 116 * offset from __per_cpu_load on SMP. 117 * 118 * There also must be an entry in vmlinux_64.lds.S 119 */ 120 #define DECLARE_INIT_PER_CPU(var) \ 121 extern typeof(var) init_per_cpu_var(var) 122 123 #ifdef CONFIG_X86_64_SMP 124 # define init_per_cpu_var(var) init_per_cpu__##var 125 #else 126 # define init_per_cpu_var(var) var 127 #endif 128 129 /* 130 * For arch-specific code, we can use direct single-insn ops (they 131 * don't give an lvalue though). 132 */ 133 134 #define __pcpu_type_1 u8 135 #define __pcpu_type_2 u16 136 #define __pcpu_type_4 u32 137 #define __pcpu_type_8 u64 138 139 #define __pcpu_cast_1(val) ((u8)(((unsigned long) val) & 0xff)) 140 #define __pcpu_cast_2(val) ((u16)(((unsigned long) val) & 0xffff)) 141 #define __pcpu_cast_4(val) ((u32)(((unsigned long) val) & 0xffffffff)) 142 #define __pcpu_cast_8(val) ((u64)(val)) 143 144 #define __pcpu_op1_1(op, dst) op "b " dst 145 #define __pcpu_op1_2(op, dst) op "w " dst 146 #define __pcpu_op1_4(op, dst) op "l " dst 147 #define __pcpu_op1_8(op, dst) op "q " dst 148 149 #define __pcpu_op2_1(op, src, dst) op "b " src ", " dst 150 #define __pcpu_op2_2(op, src, dst) op "w " src ", " dst 151 #define __pcpu_op2_4(op, src, dst) op "l " src ", " dst 152 #define __pcpu_op2_8(op, src, dst) op "q " src ", " dst 153 154 #define __pcpu_reg_1(mod, x) mod "q" (x) 155 #define __pcpu_reg_2(mod, x) mod "r" (x) 156 #define __pcpu_reg_4(mod, x) mod "r" (x) 157 #define __pcpu_reg_8(mod, x) mod "r" (x) 158 159 #define __pcpu_reg_imm_1(x) "qi" (x) 160 #define __pcpu_reg_imm_2(x) "ri" (x) 161 #define __pcpu_reg_imm_4(x) "ri" (x) 162 #define __pcpu_reg_imm_8(x) "re" (x) 163 164 #ifdef CONFIG_USE_X86_SEG_SUPPORT 165 166 #define __raw_cpu_read(size, qual, pcp) \ 167 ({ \ 168 *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)); \ 169 }) 170 171 #define __raw_cpu_write(size, qual, pcp, val) \ 172 do { \ 173 *(qual __my_cpu_type(pcp) *)__my_cpu_ptr(&(pcp)) = (val); \ 174 } while (0) 175 176 #define __raw_cpu_read_const(pcp) __raw_cpu_read(, , pcp) 177 178 #else /* !CONFIG_USE_X86_SEG_SUPPORT: */ 179 180 #define __raw_cpu_read(size, qual, _var) \ 181 ({ \ 182 __pcpu_type_##size pfo_val__; \ 183 \ 184 asm qual (__pcpu_op2_##size("mov", __percpu_arg([var]), "%[val]") \ 185 : [val] __pcpu_reg_##size("=", pfo_val__) \ 186 : [var] "m" (__my_cpu_var(_var))); \ 187 \ 188 (typeof(_var))(unsigned long) pfo_val__; \ 189 }) 190 191 #define __raw_cpu_write(size, qual, _var, _val) \ 192 do { \ 193 __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \ 194 \ 195 if (0) { \ 196 TYPEOF_UNQUAL(_var) pto_tmp__; \ 197 pto_tmp__ = (_val); \ 198 (void)pto_tmp__; \ 199 } \ 200 asm qual(__pcpu_op2_##size("mov", "%[val]", __percpu_arg([var])) \ 201 : [var] "=m" (__my_cpu_var(_var)) \ 202 : [val] __pcpu_reg_imm_##size(pto_val__)); \ 203 } while (0) 204 205 /* 206 * The generic per-CPU infrastrucutre is not suitable for 207 * reading const-qualified variables. 208 */ 209 #define __raw_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) 210 211 #endif /* CONFIG_USE_X86_SEG_SUPPORT */ 212 213 #define __raw_cpu_read_stable(size, _var) \ 214 ({ \ 215 __pcpu_type_##size pfo_val__; \ 216 \ 217 asm(__pcpu_op2_##size("mov", __force_percpu_arg(a[var]), "%[val]") \ 218 : [val] __pcpu_reg_##size("=", pfo_val__) \ 219 : [var] "i" (&(_var))); \ 220 \ 221 (typeof(_var))(unsigned long) pfo_val__; \ 222 }) 223 224 #define percpu_unary_op(size, qual, op, _var) \ 225 ({ \ 226 asm qual (__pcpu_op1_##size(op, __percpu_arg([var])) \ 227 : [var] "+m" (__my_cpu_var(_var))); \ 228 }) 229 230 #define percpu_binary_op(size, qual, op, _var, _val) \ 231 do { \ 232 __pcpu_type_##size pto_val__ = __pcpu_cast_##size(_val); \ 233 \ 234 if (0) { \ 235 TYPEOF_UNQUAL(_var) pto_tmp__; \ 236 pto_tmp__ = (_val); \ 237 (void)pto_tmp__; \ 238 } \ 239 asm qual(__pcpu_op2_##size(op, "%[val]", __percpu_arg([var])) \ 240 : [var] "+m" (__my_cpu_var(_var)) \ 241 : [val] __pcpu_reg_imm_##size(pto_val__)); \ 242 } while (0) 243 244 /* 245 * Generate a per-CPU add to memory instruction and optimize code 246 * if one is added or subtracted. 247 */ 248 #define percpu_add_op(size, qual, var, val) \ 249 do { \ 250 const int pao_ID__ = \ 251 (__builtin_constant_p(val) && \ 252 ((val) == 1 || \ 253 (val) == (typeof(val))-1)) ? (int)(val) : 0; \ 254 \ 255 if (0) { \ 256 TYPEOF_UNQUAL(var) pao_tmp__; \ 257 pao_tmp__ = (val); \ 258 (void)pao_tmp__; \ 259 } \ 260 if (pao_ID__ == 1) \ 261 percpu_unary_op(size, qual, "inc", var); \ 262 else if (pao_ID__ == -1) \ 263 percpu_unary_op(size, qual, "dec", var); \ 264 else \ 265 percpu_binary_op(size, qual, "add", var, val); \ 266 } while (0) 267 268 /* 269 * Add return operation 270 */ 271 #define percpu_add_return_op(size, qual, _var, _val) \ 272 ({ \ 273 __pcpu_type_##size paro_tmp__ = __pcpu_cast_##size(_val); \ 274 \ 275 asm qual (__pcpu_op2_##size("xadd", "%[tmp]", \ 276 __percpu_arg([var])) \ 277 : [tmp] __pcpu_reg_##size("+", paro_tmp__), \ 278 [var] "+m" (__my_cpu_var(_var)) \ 279 : : "memory"); \ 280 (typeof(_var))(unsigned long) (paro_tmp__ + _val); \ 281 }) 282 283 /* 284 * raw_cpu_xchg() can use a load-store since 285 * it is not required to be IRQ-safe. 286 */ 287 #define raw_percpu_xchg_op(_var, _nval) \ 288 ({ \ 289 TYPEOF_UNQUAL(_var) pxo_old__ = raw_cpu_read(_var); \ 290 \ 291 raw_cpu_write(_var, _nval); \ 292 \ 293 pxo_old__; \ 294 }) 295 296 /* 297 * this_cpu_xchg() is implemented using CMPXCHG without a LOCK prefix. 298 * XCHG is expensive due to the implied LOCK prefix. The processor 299 * cannot prefetch cachelines if XCHG is used. 300 */ 301 #define this_percpu_xchg_op(_var, _nval) \ 302 ({ \ 303 TYPEOF_UNQUAL(_var) pxo_old__ = this_cpu_read(_var); \ 304 \ 305 do { } while (!this_cpu_try_cmpxchg(_var, &pxo_old__, _nval)); \ 306 \ 307 pxo_old__; \ 308 }) 309 310 /* 311 * CMPXCHG has no such implied lock semantics as a result it is much 312 * more efficient for CPU-local operations. 313 */ 314 #define percpu_cmpxchg_op(size, qual, _var, _oval, _nval) \ 315 ({ \ 316 __pcpu_type_##size pco_old__ = __pcpu_cast_##size(_oval); \ 317 __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \ 318 \ 319 asm qual (__pcpu_op2_##size("cmpxchg", "%[nval]", \ 320 __percpu_arg([var])) \ 321 : [oval] "+a" (pco_old__), \ 322 [var] "+m" (__my_cpu_var(_var)) \ 323 : [nval] __pcpu_reg_##size(, pco_new__) \ 324 : "memory"); \ 325 \ 326 (typeof(_var))(unsigned long) pco_old__; \ 327 }) 328 329 #define percpu_try_cmpxchg_op(size, qual, _var, _ovalp, _nval) \ 330 ({ \ 331 bool success; \ 332 __pcpu_type_##size *pco_oval__ = (__pcpu_type_##size *)(_ovalp); \ 333 __pcpu_type_##size pco_old__ = *pco_oval__; \ 334 __pcpu_type_##size pco_new__ = __pcpu_cast_##size(_nval); \ 335 \ 336 asm qual (__pcpu_op2_##size("cmpxchg", "%[nval]", \ 337 __percpu_arg([var])) \ 338 CC_SET(z) \ 339 : CC_OUT(z) (success), \ 340 [oval] "+a" (pco_old__), \ 341 [var] "+m" (__my_cpu_var(_var)) \ 342 : [nval] __pcpu_reg_##size(, pco_new__) \ 343 : "memory"); \ 344 if (unlikely(!success)) \ 345 *pco_oval__ = pco_old__; \ 346 \ 347 likely(success); \ 348 }) 349 350 #if defined(CONFIG_X86_32) && !defined(CONFIG_UML) 351 352 #define percpu_cmpxchg64_op(size, qual, _var, _oval, _nval) \ 353 ({ \ 354 union { \ 355 u64 var; \ 356 struct { \ 357 u32 low, high; \ 358 }; \ 359 } old__, new__; \ 360 \ 361 old__.var = _oval; \ 362 new__.var = _nval; \ 363 \ 364 asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \ 365 "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ 366 : [var] "+m" (__my_cpu_var(_var)), \ 367 "+a" (old__.low), \ 368 "+d" (old__.high) \ 369 : "b" (new__.low), \ 370 "c" (new__.high), \ 371 "S" (&(_var)) \ 372 : "memory"); \ 373 \ 374 old__.var; \ 375 }) 376 377 #define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, , pcp, oval, nval) 378 #define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg64_op(8, volatile, pcp, oval, nval) 379 380 #define percpu_try_cmpxchg64_op(size, qual, _var, _ovalp, _nval) \ 381 ({ \ 382 bool success; \ 383 u64 *_oval = (u64 *)(_ovalp); \ 384 union { \ 385 u64 var; \ 386 struct { \ 387 u32 low, high; \ 388 }; \ 389 } old__, new__; \ 390 \ 391 old__.var = *_oval; \ 392 new__.var = _nval; \ 393 \ 394 asm qual (ALTERNATIVE("call this_cpu_cmpxchg8b_emu", \ 395 "cmpxchg8b " __percpu_arg([var]), X86_FEATURE_CX8) \ 396 CC_SET(z) \ 397 : CC_OUT(z) (success), \ 398 [var] "+m" (__my_cpu_var(_var)), \ 399 "+a" (old__.low), \ 400 "+d" (old__.high) \ 401 : "b" (new__.low), \ 402 "c" (new__.high), \ 403 "S" (&(_var)) \ 404 : "memory"); \ 405 if (unlikely(!success)) \ 406 *_oval = old__.var; \ 407 \ 408 likely(success); \ 409 }) 410 411 #define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, , pcp, ovalp, nval) 412 #define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg64_op(8, volatile, pcp, ovalp, nval) 413 414 #endif /* defined(CONFIG_X86_32) && !defined(CONFIG_UML) */ 415 416 #ifdef CONFIG_X86_64 417 #define raw_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval); 418 #define this_cpu_cmpxchg64(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval); 419 420 #define raw_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval); 421 #define this_cpu_try_cmpxchg64(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval); 422 423 #define percpu_cmpxchg128_op(size, qual, _var, _oval, _nval) \ 424 ({ \ 425 union { \ 426 u128 var; \ 427 struct { \ 428 u64 low, high; \ 429 }; \ 430 } old__, new__; \ 431 \ 432 old__.var = _oval; \ 433 new__.var = _nval; \ 434 \ 435 asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \ 436 "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ 437 : [var] "+m" (__my_cpu_var(_var)), \ 438 "+a" (old__.low), \ 439 "+d" (old__.high) \ 440 : "b" (new__.low), \ 441 "c" (new__.high), \ 442 "S" (&(_var)) \ 443 : "memory"); \ 444 \ 445 old__.var; \ 446 }) 447 448 #define raw_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, , pcp, oval, nval) 449 #define this_cpu_cmpxchg128(pcp, oval, nval) percpu_cmpxchg128_op(16, volatile, pcp, oval, nval) 450 451 #define percpu_try_cmpxchg128_op(size, qual, _var, _ovalp, _nval) \ 452 ({ \ 453 bool success; \ 454 u128 *_oval = (u128 *)(_ovalp); \ 455 union { \ 456 u128 var; \ 457 struct { \ 458 u64 low, high; \ 459 }; \ 460 } old__, new__; \ 461 \ 462 old__.var = *_oval; \ 463 new__.var = _nval; \ 464 \ 465 asm qual (ALTERNATIVE("call this_cpu_cmpxchg16b_emu", \ 466 "cmpxchg16b " __percpu_arg([var]), X86_FEATURE_CX16) \ 467 CC_SET(z) \ 468 : CC_OUT(z) (success), \ 469 [var] "+m" (__my_cpu_var(_var)), \ 470 "+a" (old__.low), \ 471 "+d" (old__.high) \ 472 : "b" (new__.low), \ 473 "c" (new__.high), \ 474 "S" (&(_var)) \ 475 : "memory"); \ 476 if (unlikely(!success)) \ 477 *_oval = old__.var; \ 478 likely(success); \ 479 }) 480 481 #define raw_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, , pcp, ovalp, nval) 482 #define this_cpu_try_cmpxchg128(pcp, ovalp, nval) percpu_try_cmpxchg128_op(16, volatile, pcp, ovalp, nval) 483 484 #endif /* CONFIG_X86_64 */ 485 486 #define raw_cpu_read_1(pcp) __raw_cpu_read(1, , pcp) 487 #define raw_cpu_read_2(pcp) __raw_cpu_read(2, , pcp) 488 #define raw_cpu_read_4(pcp) __raw_cpu_read(4, , pcp) 489 #define raw_cpu_write_1(pcp, val) __raw_cpu_write(1, , pcp, val) 490 #define raw_cpu_write_2(pcp, val) __raw_cpu_write(2, , pcp, val) 491 #define raw_cpu_write_4(pcp, val) __raw_cpu_write(4, , pcp, val) 492 493 #define this_cpu_read_1(pcp) __raw_cpu_read(1, volatile, pcp) 494 #define this_cpu_read_2(pcp) __raw_cpu_read(2, volatile, pcp) 495 #define this_cpu_read_4(pcp) __raw_cpu_read(4, volatile, pcp) 496 #define this_cpu_write_1(pcp, val) __raw_cpu_write(1, volatile, pcp, val) 497 #define this_cpu_write_2(pcp, val) __raw_cpu_write(2, volatile, pcp, val) 498 #define this_cpu_write_4(pcp, val) __raw_cpu_write(4, volatile, pcp, val) 499 500 #define this_cpu_read_stable_1(pcp) __raw_cpu_read_stable(1, pcp) 501 #define this_cpu_read_stable_2(pcp) __raw_cpu_read_stable(2, pcp) 502 #define this_cpu_read_stable_4(pcp) __raw_cpu_read_stable(4, pcp) 503 504 #define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val) 505 #define raw_cpu_add_2(pcp, val) percpu_add_op(2, , (pcp), val) 506 #define raw_cpu_add_4(pcp, val) percpu_add_op(4, , (pcp), val) 507 #define raw_cpu_and_1(pcp, val) percpu_binary_op(1, , "and", (pcp), val) 508 #define raw_cpu_and_2(pcp, val) percpu_binary_op(2, , "and", (pcp), val) 509 #define raw_cpu_and_4(pcp, val) percpu_binary_op(4, , "and", (pcp), val) 510 #define raw_cpu_or_1(pcp, val) percpu_binary_op(1, , "or", (pcp), val) 511 #define raw_cpu_or_2(pcp, val) percpu_binary_op(2, , "or", (pcp), val) 512 #define raw_cpu_or_4(pcp, val) percpu_binary_op(4, , "or", (pcp), val) 513 #define raw_cpu_xchg_1(pcp, val) raw_percpu_xchg_op(pcp, val) 514 #define raw_cpu_xchg_2(pcp, val) raw_percpu_xchg_op(pcp, val) 515 #define raw_cpu_xchg_4(pcp, val) raw_percpu_xchg_op(pcp, val) 516 517 #define this_cpu_add_1(pcp, val) percpu_add_op(1, volatile, (pcp), val) 518 #define this_cpu_add_2(pcp, val) percpu_add_op(2, volatile, (pcp), val) 519 #define this_cpu_add_4(pcp, val) percpu_add_op(4, volatile, (pcp), val) 520 #define this_cpu_and_1(pcp, val) percpu_binary_op(1, volatile, "and", (pcp), val) 521 #define this_cpu_and_2(pcp, val) percpu_binary_op(2, volatile, "and", (pcp), val) 522 #define this_cpu_and_4(pcp, val) percpu_binary_op(4, volatile, "and", (pcp), val) 523 #define this_cpu_or_1(pcp, val) percpu_binary_op(1, volatile, "or", (pcp), val) 524 #define this_cpu_or_2(pcp, val) percpu_binary_op(2, volatile, "or", (pcp), val) 525 #define this_cpu_or_4(pcp, val) percpu_binary_op(4, volatile, "or", (pcp), val) 526 #define this_cpu_xchg_1(pcp, nval) this_percpu_xchg_op(pcp, nval) 527 #define this_cpu_xchg_2(pcp, nval) this_percpu_xchg_op(pcp, nval) 528 #define this_cpu_xchg_4(pcp, nval) this_percpu_xchg_op(pcp, nval) 529 530 #define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(1, , pcp, val) 531 #define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(2, , pcp, val) 532 #define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(4, , pcp, val) 533 #define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, , pcp, oval, nval) 534 #define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, , pcp, oval, nval) 535 #define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, , pcp, oval, nval) 536 #define raw_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, , pcp, ovalp, nval) 537 #define raw_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, , pcp, ovalp, nval) 538 #define raw_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, , pcp, ovalp, nval) 539 540 #define this_cpu_add_return_1(pcp, val) percpu_add_return_op(1, volatile, pcp, val) 541 #define this_cpu_add_return_2(pcp, val) percpu_add_return_op(2, volatile, pcp, val) 542 #define this_cpu_add_return_4(pcp, val) percpu_add_return_op(4, volatile, pcp, val) 543 #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(1, volatile, pcp, oval, nval) 544 #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(2, volatile, pcp, oval, nval) 545 #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(4, volatile, pcp, oval, nval) 546 #define this_cpu_try_cmpxchg_1(pcp, ovalp, nval) percpu_try_cmpxchg_op(1, volatile, pcp, ovalp, nval) 547 #define this_cpu_try_cmpxchg_2(pcp, ovalp, nval) percpu_try_cmpxchg_op(2, volatile, pcp, ovalp, nval) 548 #define this_cpu_try_cmpxchg_4(pcp, ovalp, nval) percpu_try_cmpxchg_op(4, volatile, pcp, ovalp, nval) 549 550 /* 551 * Per-CPU atomic 64-bit operations are only available under 64-bit kernels. 552 * 32-bit kernels must fall back to generic operations. 553 */ 554 #ifdef CONFIG_X86_64 555 556 #define raw_cpu_read_8(pcp) __raw_cpu_read(8, , pcp) 557 #define raw_cpu_write_8(pcp, val) __raw_cpu_write(8, , pcp, val) 558 559 #define this_cpu_read_8(pcp) __raw_cpu_read(8, volatile, pcp) 560 #define this_cpu_write_8(pcp, val) __raw_cpu_write(8, volatile, pcp, val) 561 562 #define this_cpu_read_stable_8(pcp) __raw_cpu_read_stable(8, pcp) 563 564 #define raw_cpu_add_8(pcp, val) percpu_add_op(8, , (pcp), val) 565 #define raw_cpu_and_8(pcp, val) percpu_binary_op(8, , "and", (pcp), val) 566 #define raw_cpu_or_8(pcp, val) percpu_binary_op(8, , "or", (pcp), val) 567 #define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(8, , pcp, val) 568 #define raw_cpu_xchg_8(pcp, nval) raw_percpu_xchg_op(pcp, nval) 569 #define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, , pcp, oval, nval) 570 #define raw_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, , pcp, ovalp, nval) 571 572 #define this_cpu_add_8(pcp, val) percpu_add_op(8, volatile, (pcp), val) 573 #define this_cpu_and_8(pcp, val) percpu_binary_op(8, volatile, "and", (pcp), val) 574 #define this_cpu_or_8(pcp, val) percpu_binary_op(8, volatile, "or", (pcp), val) 575 #define this_cpu_add_return_8(pcp, val) percpu_add_return_op(8, volatile, pcp, val) 576 #define this_cpu_xchg_8(pcp, nval) this_percpu_xchg_op(pcp, nval) 577 #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval) 578 #define this_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval) 579 580 #define raw_cpu_read_long(pcp) raw_cpu_read_8(pcp) 581 582 #else /* !CONFIG_X86_64: */ 583 584 /* There is no generic 64-bit read stable operation for 32-bit targets. */ 585 #define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) 586 587 #define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp) 588 589 #endif /* CONFIG_X86_64 */ 590 591 #define this_cpu_read_const(pcp) __raw_cpu_read_const(pcp) 592 593 /* 594 * this_cpu_read() makes the compiler load the per-CPU variable every time 595 * it is accessed while this_cpu_read_stable() allows the value to be cached. 596 * this_cpu_read_stable() is more efficient and can be used if its value 597 * is guaranteed to be valid across CPUs. The current users include 598 * pcpu_hot.current_task and pcpu_hot.top_of_stack, both of which are 599 * actually per-thread variables implemented as per-CPU variables and 600 * thus stable for the duration of the respective task. 601 */ 602 #define this_cpu_read_stable(pcp) __pcpu_size_call_return(this_cpu_read_stable_, pcp) 603 604 #define x86_this_cpu_constant_test_bit(_nr, _var) \ 605 ({ \ 606 unsigned long __percpu *addr__ = \ 607 (unsigned long __percpu *)&(_var) + ((_nr) / BITS_PER_LONG); \ 608 \ 609 !!((1UL << ((_nr) % BITS_PER_LONG)) & raw_cpu_read(*addr__)); \ 610 }) 611 612 #define x86_this_cpu_variable_test_bit(_nr, _var) \ 613 ({ \ 614 bool oldbit; \ 615 \ 616 asm volatile("btl %[nr], " __percpu_arg([var]) \ 617 CC_SET(c) \ 618 : CC_OUT(c) (oldbit) \ 619 : [var] "m" (__my_cpu_var(_var)), \ 620 [nr] "rI" (_nr)); \ 621 oldbit; \ 622 }) 623 624 #define x86_this_cpu_test_bit(_nr, _var) \ 625 (__builtin_constant_p(_nr) \ 626 ? x86_this_cpu_constant_test_bit(_nr, _var) \ 627 : x86_this_cpu_variable_test_bit(_nr, _var)) 628 629 630 #include <asm-generic/percpu.h> 631 632 /* We can use this directly for local CPU (faster). */ 633 DECLARE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off); 634 635 #endif /* !__ASSEMBLY__ */ 636 637 #ifdef CONFIG_SMP 638 639 /* 640 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu 641 * variables that are initialized and accessed before there are per_cpu 642 * areas allocated. 643 */ 644 645 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ 646 DEFINE_PER_CPU(_type, _name) = _initvalue; \ 647 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ 648 { [0 ... NR_CPUS-1] = _initvalue }; \ 649 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map 650 651 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ 652 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \ 653 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ 654 { [0 ... NR_CPUS-1] = _initvalue }; \ 655 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map 656 657 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ 658 EXPORT_PER_CPU_SYMBOL(_name) 659 660 #define DECLARE_EARLY_PER_CPU(_type, _name) \ 661 DECLARE_PER_CPU(_type, _name); \ 662 extern __typeof__(_type) *_name##_early_ptr; \ 663 extern __typeof__(_type) _name##_early_map[] 664 665 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ 666 DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \ 667 extern __typeof__(_type) *_name##_early_ptr; \ 668 extern __typeof__(_type) _name##_early_map[] 669 670 #define early_per_cpu_ptr(_name) (_name##_early_ptr) 671 #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) 672 673 #define early_per_cpu(_name, _cpu) \ 674 *(early_per_cpu_ptr(_name) ? \ 675 &early_per_cpu_ptr(_name)[_cpu] : \ 676 &per_cpu(_name, _cpu)) 677 678 #else /* !CONFIG_SMP: */ 679 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ 680 DEFINE_PER_CPU(_type, _name) = _initvalue 681 682 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ 683 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue 684 685 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ 686 EXPORT_PER_CPU_SYMBOL(_name) 687 688 #define DECLARE_EARLY_PER_CPU(_type, _name) \ 689 DECLARE_PER_CPU(_type, _name) 690 691 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ 692 DECLARE_PER_CPU_READ_MOSTLY(_type, _name) 693 694 #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) 695 #define early_per_cpu_ptr(_name) NULL 696 /* no early_per_cpu_map() */ 697 698 #endif /* !CONFIG_SMP */ 699 700 #endif /* _ASM_X86_PERCPU_H */ 701