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