1 #ifndef __LINUX_PERCPU_H 2 #define __LINUX_PERCPU_H 3 4 #include <linux/preempt.h> 5 #include <linux/smp.h> 6 #include <linux/cpumask.h> 7 #include <linux/pfn.h> 8 #include <linux/init.h> 9 10 #include <asm/percpu.h> 11 12 /* enough to cover all DEFINE_PER_CPUs in modules */ 13 #ifdef CONFIG_MODULES 14 #define PERCPU_MODULE_RESERVE (8 << 10) 15 #else 16 #define PERCPU_MODULE_RESERVE 0 17 #endif 18 19 #ifndef PERCPU_ENOUGH_ROOM 20 #define PERCPU_ENOUGH_ROOM \ 21 (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ 22 PERCPU_MODULE_RESERVE) 23 #endif 24 25 /* 26 * Must be an lvalue. Since @var must be a simple identifier, 27 * we force a syntax error here if it isn't. 28 */ 29 #define get_cpu_var(var) (*({ \ 30 preempt_disable(); \ 31 &__get_cpu_var(var); })) 32 33 /* 34 * The weird & is necessary because sparse considers (void)(var) to be 35 * a direct dereference of percpu variable (var). 36 */ 37 #define put_cpu_var(var) do { \ 38 (void)&(var); \ 39 preempt_enable(); \ 40 } while (0) 41 42 #define get_cpu_ptr(var) ({ \ 43 preempt_disable(); \ 44 this_cpu_ptr(var); }) 45 46 #define put_cpu_ptr(var) do { \ 47 (void)(var); \ 48 preempt_enable(); \ 49 } while (0) 50 51 /* minimum unit size, also is the maximum supported allocation size */ 52 #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) 53 54 /* 55 * Percpu allocator can serve percpu allocations before slab is 56 * initialized which allows slab to depend on the percpu allocator. 57 * The following two parameters decide how much resource to 58 * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or 59 * larger than PERCPU_DYNAMIC_EARLY_SIZE. 60 */ 61 #define PERCPU_DYNAMIC_EARLY_SLOTS 128 62 #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) 63 64 /* 65 * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy 66 * back on the first chunk for dynamic percpu allocation if arch is 67 * manually allocating and mapping it for faster access (as a part of 68 * large page mapping for example). 69 * 70 * The following values give between one and two pages of free space 71 * after typical minimal boot (2-way SMP, single disk and NIC) with 72 * both defconfig and a distro config on x86_64 and 32. More 73 * intelligent way to determine this would be nice. 74 */ 75 #if BITS_PER_LONG > 32 76 #define PERCPU_DYNAMIC_RESERVE (20 << 10) 77 #else 78 #define PERCPU_DYNAMIC_RESERVE (12 << 10) 79 #endif 80 81 extern void *pcpu_base_addr; 82 extern const unsigned long *pcpu_unit_offsets; 83 84 struct pcpu_group_info { 85 int nr_units; /* aligned # of units */ 86 unsigned long base_offset; /* base address offset */ 87 unsigned int *cpu_map; /* unit->cpu map, empty 88 * entries contain NR_CPUS */ 89 }; 90 91 struct pcpu_alloc_info { 92 size_t static_size; 93 size_t reserved_size; 94 size_t dyn_size; 95 size_t unit_size; 96 size_t atom_size; 97 size_t alloc_size; 98 size_t __ai_size; /* internal, don't use */ 99 int nr_groups; /* 0 if grouping unnecessary */ 100 struct pcpu_group_info groups[]; 101 }; 102 103 enum pcpu_fc { 104 PCPU_FC_AUTO, 105 PCPU_FC_EMBED, 106 PCPU_FC_PAGE, 107 108 PCPU_FC_NR, 109 }; 110 extern const char *pcpu_fc_names[PCPU_FC_NR]; 111 112 extern enum pcpu_fc pcpu_chosen_fc; 113 114 typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, 115 size_t align); 116 typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); 117 typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); 118 typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); 119 120 extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, 121 int nr_units); 122 extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); 123 124 extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, 125 void *base_addr); 126 127 #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK 128 extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, 129 size_t atom_size, 130 pcpu_fc_cpu_distance_fn_t cpu_distance_fn, 131 pcpu_fc_alloc_fn_t alloc_fn, 132 pcpu_fc_free_fn_t free_fn); 133 #endif 134 135 #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK 136 extern int __init pcpu_page_first_chunk(size_t reserved_size, 137 pcpu_fc_alloc_fn_t alloc_fn, 138 pcpu_fc_free_fn_t free_fn, 139 pcpu_fc_populate_pte_fn_t populate_pte_fn); 140 #endif 141 142 /* 143 * Use this to get to a cpu's version of the per-cpu object 144 * dynamically allocated. Non-atomic access to the current CPU's 145 * version should probably be combined with get_cpu()/put_cpu(). 146 */ 147 #ifdef CONFIG_SMP 148 #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) 149 #else 150 #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) 151 #endif 152 153 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); 154 extern bool is_kernel_percpu_address(unsigned long addr); 155 156 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) 157 extern void __init setup_per_cpu_areas(void); 158 #endif 159 extern void __init percpu_init_late(void); 160 161 extern void __percpu *__alloc_percpu(size_t size, size_t align); 162 extern void free_percpu(void __percpu *__pdata); 163 extern phys_addr_t per_cpu_ptr_to_phys(void *addr); 164 165 #define alloc_percpu(type) \ 166 (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) 167 168 /* 169 * Optional methods for optimized non-lvalue per-cpu variable access. 170 * 171 * @var can be a percpu variable or a field of it and its size should 172 * equal char, int or long. percpu_read() evaluates to a lvalue and 173 * all others to void. 174 * 175 * These operations are guaranteed to be atomic w.r.t. preemption. 176 * The generic versions use plain get/put_cpu_var(). Archs are 177 * encouraged to implement single-instruction alternatives which don't 178 * require preemption protection. 179 */ 180 #ifndef percpu_read 181 # define percpu_read(var) \ 182 ({ \ 183 typeof(var) *pr_ptr__ = &(var); \ 184 typeof(var) pr_ret__; \ 185 pr_ret__ = get_cpu_var(*pr_ptr__); \ 186 put_cpu_var(*pr_ptr__); \ 187 pr_ret__; \ 188 }) 189 #endif 190 191 #define __percpu_generic_to_op(var, val, op) \ 192 do { \ 193 typeof(var) *pgto_ptr__ = &(var); \ 194 get_cpu_var(*pgto_ptr__) op val; \ 195 put_cpu_var(*pgto_ptr__); \ 196 } while (0) 197 198 #ifndef percpu_write 199 # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) 200 #endif 201 202 #ifndef percpu_add 203 # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) 204 #endif 205 206 #ifndef percpu_sub 207 # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) 208 #endif 209 210 #ifndef percpu_and 211 # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) 212 #endif 213 214 #ifndef percpu_or 215 # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) 216 #endif 217 218 #ifndef percpu_xor 219 # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) 220 #endif 221 222 /* 223 * Branching function to split up a function into a set of functions that 224 * are called for different scalar sizes of the objects handled. 225 */ 226 227 extern void __bad_size_call_parameter(void); 228 229 #define __pcpu_size_call_return(stem, variable) \ 230 ({ typeof(variable) pscr_ret__; \ 231 __verify_pcpu_ptr(&(variable)); \ 232 switch(sizeof(variable)) { \ 233 case 1: pscr_ret__ = stem##1(variable);break; \ 234 case 2: pscr_ret__ = stem##2(variable);break; \ 235 case 4: pscr_ret__ = stem##4(variable);break; \ 236 case 8: pscr_ret__ = stem##8(variable);break; \ 237 default: \ 238 __bad_size_call_parameter();break; \ 239 } \ 240 pscr_ret__; \ 241 }) 242 243 #define __pcpu_size_call_return2(stem, variable, ...) \ 244 ({ \ 245 typeof(variable) pscr2_ret__; \ 246 __verify_pcpu_ptr(&(variable)); \ 247 switch(sizeof(variable)) { \ 248 case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ 249 case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ 250 case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ 251 case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ 252 default: \ 253 __bad_size_call_parameter(); break; \ 254 } \ 255 pscr2_ret__; \ 256 }) 257 258 #define __pcpu_size_call(stem, variable, ...) \ 259 do { \ 260 __verify_pcpu_ptr(&(variable)); \ 261 switch(sizeof(variable)) { \ 262 case 1: stem##1(variable, __VA_ARGS__);break; \ 263 case 2: stem##2(variable, __VA_ARGS__);break; \ 264 case 4: stem##4(variable, __VA_ARGS__);break; \ 265 case 8: stem##8(variable, __VA_ARGS__);break; \ 266 default: \ 267 __bad_size_call_parameter();break; \ 268 } \ 269 } while (0) 270 271 /* 272 * Optimized manipulation for memory allocated through the per cpu 273 * allocator or for addresses of per cpu variables. 274 * 275 * These operation guarantee exclusivity of access for other operations 276 * on the *same* processor. The assumption is that per cpu data is only 277 * accessed by a single processor instance (the current one). 278 * 279 * The first group is used for accesses that must be done in a 280 * preemption safe way since we know that the context is not preempt 281 * safe. Interrupts may occur. If the interrupt modifies the variable 282 * too then RMW actions will not be reliable. 283 * 284 * The arch code can provide optimized functions in two ways: 285 * 286 * 1. Override the function completely. F.e. define this_cpu_add(). 287 * The arch must then ensure that the various scalar format passed 288 * are handled correctly. 289 * 290 * 2. Provide functions for certain scalar sizes. F.e. provide 291 * this_cpu_add_2() to provide per cpu atomic operations for 2 byte 292 * sized RMW actions. If arch code does not provide operations for 293 * a scalar size then the fallback in the generic code will be 294 * used. 295 */ 296 297 #define _this_cpu_generic_read(pcp) \ 298 ({ typeof(pcp) ret__; \ 299 preempt_disable(); \ 300 ret__ = *this_cpu_ptr(&(pcp)); \ 301 preempt_enable(); \ 302 ret__; \ 303 }) 304 305 #ifndef this_cpu_read 306 # ifndef this_cpu_read_1 307 # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) 308 # endif 309 # ifndef this_cpu_read_2 310 # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) 311 # endif 312 # ifndef this_cpu_read_4 313 # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) 314 # endif 315 # ifndef this_cpu_read_8 316 # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) 317 # endif 318 # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) 319 #endif 320 321 #define _this_cpu_generic_to_op(pcp, val, op) \ 322 do { \ 323 preempt_disable(); \ 324 *__this_cpu_ptr(&(pcp)) op val; \ 325 preempt_enable(); \ 326 } while (0) 327 328 #ifndef this_cpu_write 329 # ifndef this_cpu_write_1 330 # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) 331 # endif 332 # ifndef this_cpu_write_2 333 # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) 334 # endif 335 # ifndef this_cpu_write_4 336 # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) 337 # endif 338 # ifndef this_cpu_write_8 339 # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) 340 # endif 341 # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) 342 #endif 343 344 #ifndef this_cpu_add 345 # ifndef this_cpu_add_1 346 # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) 347 # endif 348 # ifndef this_cpu_add_2 349 # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) 350 # endif 351 # ifndef this_cpu_add_4 352 # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) 353 # endif 354 # ifndef this_cpu_add_8 355 # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) 356 # endif 357 # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) 358 #endif 359 360 #ifndef this_cpu_sub 361 # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) 362 #endif 363 364 #ifndef this_cpu_inc 365 # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) 366 #endif 367 368 #ifndef this_cpu_dec 369 # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) 370 #endif 371 372 #ifndef this_cpu_and 373 # ifndef this_cpu_and_1 374 # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) 375 # endif 376 # ifndef this_cpu_and_2 377 # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) 378 # endif 379 # ifndef this_cpu_and_4 380 # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) 381 # endif 382 # ifndef this_cpu_and_8 383 # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) 384 # endif 385 # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) 386 #endif 387 388 #ifndef this_cpu_or 389 # ifndef this_cpu_or_1 390 # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) 391 # endif 392 # ifndef this_cpu_or_2 393 # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) 394 # endif 395 # ifndef this_cpu_or_4 396 # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) 397 # endif 398 # ifndef this_cpu_or_8 399 # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) 400 # endif 401 # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) 402 #endif 403 404 #ifndef this_cpu_xor 405 # ifndef this_cpu_xor_1 406 # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) 407 # endif 408 # ifndef this_cpu_xor_2 409 # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) 410 # endif 411 # ifndef this_cpu_xor_4 412 # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) 413 # endif 414 # ifndef this_cpu_xor_8 415 # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) 416 # endif 417 # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) 418 #endif 419 420 #define _this_cpu_generic_add_return(pcp, val) \ 421 ({ \ 422 typeof(pcp) ret__; \ 423 preempt_disable(); \ 424 __this_cpu_add(pcp, val); \ 425 ret__ = __this_cpu_read(pcp); \ 426 preempt_enable(); \ 427 ret__; \ 428 }) 429 430 #ifndef this_cpu_add_return 431 # ifndef this_cpu_add_return_1 432 # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) 433 # endif 434 # ifndef this_cpu_add_return_2 435 # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) 436 # endif 437 # ifndef this_cpu_add_return_4 438 # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) 439 # endif 440 # ifndef this_cpu_add_return_8 441 # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) 442 # endif 443 # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) 444 #endif 445 446 #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) 447 #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) 448 #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) 449 450 #define _this_cpu_generic_xchg(pcp, nval) \ 451 ({ typeof(pcp) ret__; \ 452 preempt_disable(); \ 453 ret__ = __this_cpu_read(pcp); \ 454 __this_cpu_write(pcp, nval); \ 455 preempt_enable(); \ 456 ret__; \ 457 }) 458 459 #ifndef this_cpu_xchg 460 # ifndef this_cpu_xchg_1 461 # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) 462 # endif 463 # ifndef this_cpu_xchg_2 464 # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) 465 # endif 466 # ifndef this_cpu_xchg_4 467 # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) 468 # endif 469 # ifndef this_cpu_xchg_8 470 # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) 471 # endif 472 # define this_cpu_xchg(pcp, nval) \ 473 __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) 474 #endif 475 476 #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ 477 ({ typeof(pcp) ret__; \ 478 preempt_disable(); \ 479 ret__ = __this_cpu_read(pcp); \ 480 if (ret__ == (oval)) \ 481 __this_cpu_write(pcp, nval); \ 482 preempt_enable(); \ 483 ret__; \ 484 }) 485 486 #ifndef this_cpu_cmpxchg 487 # ifndef this_cpu_cmpxchg_1 488 # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) 489 # endif 490 # ifndef this_cpu_cmpxchg_2 491 # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) 492 # endif 493 # ifndef this_cpu_cmpxchg_4 494 # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) 495 # endif 496 # ifndef this_cpu_cmpxchg_8 497 # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) 498 # endif 499 # define this_cpu_cmpxchg(pcp, oval, nval) \ 500 __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) 501 #endif 502 503 /* 504 * Generic percpu operations that do not require preemption handling. 505 * Either we do not care about races or the caller has the 506 * responsibility of handling preemptions issues. Arch code can still 507 * override these instructions since the arch per cpu code may be more 508 * efficient and may actually get race freeness for free (that is the 509 * case for x86 for example). 510 * 511 * If there is no other protection through preempt disable and/or 512 * disabling interupts then one of these RMW operations can show unexpected 513 * behavior because the execution thread was rescheduled on another processor 514 * or an interrupt occurred and the same percpu variable was modified from 515 * the interrupt context. 516 */ 517 #ifndef __this_cpu_read 518 # ifndef __this_cpu_read_1 519 # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) 520 # endif 521 # ifndef __this_cpu_read_2 522 # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) 523 # endif 524 # ifndef __this_cpu_read_4 525 # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) 526 # endif 527 # ifndef __this_cpu_read_8 528 # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) 529 # endif 530 # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) 531 #endif 532 533 #define __this_cpu_generic_to_op(pcp, val, op) \ 534 do { \ 535 *__this_cpu_ptr(&(pcp)) op val; \ 536 } while (0) 537 538 #ifndef __this_cpu_write 539 # ifndef __this_cpu_write_1 540 # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) 541 # endif 542 # ifndef __this_cpu_write_2 543 # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) 544 # endif 545 # ifndef __this_cpu_write_4 546 # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) 547 # endif 548 # ifndef __this_cpu_write_8 549 # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) 550 # endif 551 # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) 552 #endif 553 554 #ifndef __this_cpu_add 555 # ifndef __this_cpu_add_1 556 # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) 557 # endif 558 # ifndef __this_cpu_add_2 559 # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) 560 # endif 561 # ifndef __this_cpu_add_4 562 # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) 563 # endif 564 # ifndef __this_cpu_add_8 565 # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) 566 # endif 567 # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) 568 #endif 569 570 #ifndef __this_cpu_sub 571 # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) 572 #endif 573 574 #ifndef __this_cpu_inc 575 # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) 576 #endif 577 578 #ifndef __this_cpu_dec 579 # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) 580 #endif 581 582 #ifndef __this_cpu_and 583 # ifndef __this_cpu_and_1 584 # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) 585 # endif 586 # ifndef __this_cpu_and_2 587 # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) 588 # endif 589 # ifndef __this_cpu_and_4 590 # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) 591 # endif 592 # ifndef __this_cpu_and_8 593 # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) 594 # endif 595 # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) 596 #endif 597 598 #ifndef __this_cpu_or 599 # ifndef __this_cpu_or_1 600 # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) 601 # endif 602 # ifndef __this_cpu_or_2 603 # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) 604 # endif 605 # ifndef __this_cpu_or_4 606 # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) 607 # endif 608 # ifndef __this_cpu_or_8 609 # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) 610 # endif 611 # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) 612 #endif 613 614 #ifndef __this_cpu_xor 615 # ifndef __this_cpu_xor_1 616 # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) 617 # endif 618 # ifndef __this_cpu_xor_2 619 # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) 620 # endif 621 # ifndef __this_cpu_xor_4 622 # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) 623 # endif 624 # ifndef __this_cpu_xor_8 625 # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) 626 # endif 627 # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) 628 #endif 629 630 #define __this_cpu_generic_add_return(pcp, val) \ 631 ({ \ 632 __this_cpu_add(pcp, val); \ 633 __this_cpu_read(pcp); \ 634 }) 635 636 #ifndef __this_cpu_add_return 637 # ifndef __this_cpu_add_return_1 638 # define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) 639 # endif 640 # ifndef __this_cpu_add_return_2 641 # define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) 642 # endif 643 # ifndef __this_cpu_add_return_4 644 # define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) 645 # endif 646 # ifndef __this_cpu_add_return_8 647 # define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) 648 # endif 649 # define __this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) 650 #endif 651 652 #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) 653 #define __this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) 654 #define __this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) 655 656 #define __this_cpu_generic_xchg(pcp, nval) \ 657 ({ typeof(pcp) ret__; \ 658 ret__ = __this_cpu_read(pcp); \ 659 __this_cpu_write(pcp, nval); \ 660 ret__; \ 661 }) 662 663 #ifndef __this_cpu_xchg 664 # ifndef __this_cpu_xchg_1 665 # define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) 666 # endif 667 # ifndef __this_cpu_xchg_2 668 # define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) 669 # endif 670 # ifndef __this_cpu_xchg_4 671 # define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) 672 # endif 673 # ifndef __this_cpu_xchg_8 674 # define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) 675 # endif 676 # define __this_cpu_xchg(pcp, nval) \ 677 __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) 678 #endif 679 680 #define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ 681 ({ \ 682 typeof(pcp) ret__; \ 683 ret__ = __this_cpu_read(pcp); \ 684 if (ret__ == (oval)) \ 685 __this_cpu_write(pcp, nval); \ 686 ret__; \ 687 }) 688 689 #ifndef __this_cpu_cmpxchg 690 # ifndef __this_cpu_cmpxchg_1 691 # define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) 692 # endif 693 # ifndef __this_cpu_cmpxchg_2 694 # define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) 695 # endif 696 # ifndef __this_cpu_cmpxchg_4 697 # define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) 698 # endif 699 # ifndef __this_cpu_cmpxchg_8 700 # define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) 701 # endif 702 # define __this_cpu_cmpxchg(pcp, oval, nval) \ 703 __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) 704 #endif 705 706 /* 707 * IRQ safe versions of the per cpu RMW operations. Note that these operations 708 * are *not* safe against modification of the same variable from another 709 * processors (which one gets when using regular atomic operations) 710 * They are guaranteed to be atomic vs. local interrupts and 711 * preemption only. 712 */ 713 #define irqsafe_cpu_generic_to_op(pcp, val, op) \ 714 do { \ 715 unsigned long flags; \ 716 local_irq_save(flags); \ 717 *__this_cpu_ptr(&(pcp)) op val; \ 718 local_irq_restore(flags); \ 719 } while (0) 720 721 #ifndef irqsafe_cpu_add 722 # ifndef irqsafe_cpu_add_1 723 # define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) 724 # endif 725 # ifndef irqsafe_cpu_add_2 726 # define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) 727 # endif 728 # ifndef irqsafe_cpu_add_4 729 # define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) 730 # endif 731 # ifndef irqsafe_cpu_add_8 732 # define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) 733 # endif 734 # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val)) 735 #endif 736 737 #ifndef irqsafe_cpu_sub 738 # define irqsafe_cpu_sub(pcp, val) irqsafe_cpu_add((pcp), -(val)) 739 #endif 740 741 #ifndef irqsafe_cpu_inc 742 # define irqsafe_cpu_inc(pcp) irqsafe_cpu_add((pcp), 1) 743 #endif 744 745 #ifndef irqsafe_cpu_dec 746 # define irqsafe_cpu_dec(pcp) irqsafe_cpu_sub((pcp), 1) 747 #endif 748 749 #ifndef irqsafe_cpu_and 750 # ifndef irqsafe_cpu_and_1 751 # define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) 752 # endif 753 # ifndef irqsafe_cpu_and_2 754 # define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) 755 # endif 756 # ifndef irqsafe_cpu_and_4 757 # define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) 758 # endif 759 # ifndef irqsafe_cpu_and_8 760 # define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) 761 # endif 762 # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val)) 763 #endif 764 765 #ifndef irqsafe_cpu_or 766 # ifndef irqsafe_cpu_or_1 767 # define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) 768 # endif 769 # ifndef irqsafe_cpu_or_2 770 # define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) 771 # endif 772 # ifndef irqsafe_cpu_or_4 773 # define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) 774 # endif 775 # ifndef irqsafe_cpu_or_8 776 # define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) 777 # endif 778 # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val)) 779 #endif 780 781 #ifndef irqsafe_cpu_xor 782 # ifndef irqsafe_cpu_xor_1 783 # define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) 784 # endif 785 # ifndef irqsafe_cpu_xor_2 786 # define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) 787 # endif 788 # ifndef irqsafe_cpu_xor_4 789 # define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) 790 # endif 791 # ifndef irqsafe_cpu_xor_8 792 # define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) 793 # endif 794 # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val)) 795 #endif 796 797 #define irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) \ 798 ({ \ 799 typeof(pcp) ret__; \ 800 unsigned long flags; \ 801 local_irq_save(flags); \ 802 ret__ = __this_cpu_read(pcp); \ 803 if (ret__ == (oval)) \ 804 __this_cpu_write(pcp, nval); \ 805 local_irq_restore(flags); \ 806 ret__; \ 807 }) 808 809 #ifndef irqsafe_cpu_cmpxchg 810 # ifndef irqsafe_cpu_cmpxchg_1 811 # define irqsafe_cpu_cmpxchg_1(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) 812 # endif 813 # ifndef irqsafe_cpu_cmpxchg_2 814 # define irqsafe_cpu_cmpxchg_2(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) 815 # endif 816 # ifndef irqsafe_cpu_cmpxchg_4 817 # define irqsafe_cpu_cmpxchg_4(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) 818 # endif 819 # ifndef irqsafe_cpu_cmpxchg_8 820 # define irqsafe_cpu_cmpxchg_8(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) 821 # endif 822 # define irqsafe_cpu_cmpxchg(pcp, oval, nval) \ 823 __pcpu_size_call_return2(irqsafe_cpu_cmpxchg_, (pcp), oval, nval) 824 #endif 825 826 #endif /* __LINUX_PERCPU_H */ 827