arch/x86/include/asm/percpu.h

   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 */