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