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