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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 | #ifndef __LINUX_PERCPU_H #define __LINUX_PERCPU_H #include <linux/preempt.h> #include <linux/smp.h> #include <linux/cpumask.h> #include <linux/pfn.h> #include <linux/init.h> #include <asm/percpu.h> /* enough to cover all DEFINE_PER_CPUs in modules */ #ifdef CONFIG_MODULES #define PERCPU_MODULE_RESERVE (8 << 10) #else #define PERCPU_MODULE_RESERVE 0 #endif #ifndef PERCPU_ENOUGH_ROOM #define PERCPU_ENOUGH_ROOM \ (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ PERCPU_MODULE_RESERVE) #endif /* * Must be an lvalue. Since @var must be a simple identifier, * we force a syntax error here if it isn't. */ #define get_cpu_var(var) (*({ \ preempt_disable(); \ &__get_cpu_var(var); })) /* * The weird & is necessary because sparse considers (void)(var) to be * a direct dereference of percpu variable (var). */ #define put_cpu_var(var) do { \ (void)&(var); \ preempt_enable(); \ } while (0) #define get_cpu_ptr(var) ({ \ preempt_disable(); \ this_cpu_ptr(var); }) #define put_cpu_ptr(var) do { \ (void)(var); \ preempt_enable(); \ } while (0) /* minimum unit size, also is the maximum supported allocation size */ #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) /* * Percpu allocator can serve percpu allocations before slab is * initialized which allows slab to depend on the percpu allocator. * The following two parameters decide how much resource to * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or * larger than PERCPU_DYNAMIC_EARLY_SIZE. */ #define PERCPU_DYNAMIC_EARLY_SLOTS 128 #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) /* * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy * back on the first chunk for dynamic percpu allocation if arch is * manually allocating and mapping it for faster access (as a part of * large page mapping for example). * * The following values give between one and two pages of free space * after typical minimal boot (2-way SMP, single disk and NIC) with * both defconfig and a distro config on x86_64 and 32. More * intelligent way to determine this would be nice. */ #if BITS_PER_LONG > 32 #define PERCPU_DYNAMIC_RESERVE (20 << 10) #else #define PERCPU_DYNAMIC_RESERVE (12 << 10) #endif extern void *pcpu_base_addr; extern const unsigned long *pcpu_unit_offsets; struct pcpu_group_info { int nr_units; /* aligned # of units */ unsigned long base_offset; /* base address offset */ unsigned int *cpu_map; /* unit->cpu map, empty * entries contain NR_CPUS */ }; struct pcpu_alloc_info { size_t static_size; size_t reserved_size; size_t dyn_size; size_t unit_size; size_t atom_size; size_t alloc_size; size_t __ai_size; /* internal, don't use */ int nr_groups; /* 0 if grouping unnecessary */ struct pcpu_group_info groups[]; }; enum pcpu_fc { PCPU_FC_AUTO, PCPU_FC_EMBED, PCPU_FC_PAGE, PCPU_FC_NR, }; extern const char *pcpu_fc_names[PCPU_FC_NR]; extern enum pcpu_fc pcpu_chosen_fc; typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, size_t align); typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, int nr_units); extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, void *base_addr); #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, size_t atom_size, pcpu_fc_cpu_distance_fn_t cpu_distance_fn, pcpu_fc_alloc_fn_t alloc_fn, pcpu_fc_free_fn_t free_fn); #endif #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK extern int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_alloc_fn_t alloc_fn, pcpu_fc_free_fn_t free_fn, pcpu_fc_populate_pte_fn_t populate_pte_fn); #endif /* * Use this to get to a cpu's version of the per-cpu object * dynamically allocated. Non-atomic access to the current CPU's * version should probably be combined with get_cpu()/put_cpu(). */ #ifdef CONFIG_SMP #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) #else #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) #endif extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); extern bool is_kernel_percpu_address(unsigned long addr); #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) extern void __init setup_per_cpu_areas(void); #endif extern void __init percpu_init_late(void); extern void __percpu *__alloc_percpu(size_t size, size_t align); extern void free_percpu(void __percpu *__pdata); extern phys_addr_t per_cpu_ptr_to_phys(void *addr); #define alloc_percpu(type) \ (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) /* * Optional methods for optimized non-lvalue per-cpu variable access. * * @var can be a percpu variable or a field of it and its size should * equal char, int or long. percpu_read() evaluates to a lvalue and * all others to void. * * These operations are guaranteed to be atomic w.r.t. preemption. * The generic versions use plain get/put_cpu_var(). Archs are * encouraged to implement single-instruction alternatives which don't * require preemption protection. */ #ifndef percpu_read # define percpu_read(var) \ ({ \ typeof(var) *pr_ptr__ = &(var); \ typeof(var) pr_ret__; \ pr_ret__ = get_cpu_var(*pr_ptr__); \ put_cpu_var(*pr_ptr__); \ pr_ret__; \ }) #endif #define __percpu_generic_to_op(var, val, op) \ do { \ typeof(var) *pgto_ptr__ = &(var); \ get_cpu_var(*pgto_ptr__) op val; \ put_cpu_var(*pgto_ptr__); \ } while (0) #ifndef percpu_write # define percpu_write(var, val) __percpu_generic_to_op(var, (val), =) #endif #ifndef percpu_add # define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=) #endif #ifndef percpu_sub # define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=) #endif #ifndef percpu_and # define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=) #endif #ifndef percpu_or # define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=) #endif #ifndef percpu_xor # define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=) #endif /* * Branching function to split up a function into a set of functions that * are called for different scalar sizes of the objects handled. */ extern void __bad_size_call_parameter(void); #define __pcpu_size_call_return(stem, variable) \ ({ typeof(variable) pscr_ret__; \ __verify_pcpu_ptr(&(variable)); \ switch(sizeof(variable)) { \ case 1: pscr_ret__ = stem##1(variable);break; \ case 2: pscr_ret__ = stem##2(variable);break; \ case 4: pscr_ret__ = stem##4(variable);break; \ case 8: pscr_ret__ = stem##8(variable);break; \ default: \ __bad_size_call_parameter();break; \ } \ pscr_ret__; \ }) #define __pcpu_size_call_return2(stem, variable, ...) \ ({ \ typeof(variable) pscr2_ret__; \ __verify_pcpu_ptr(&(variable)); \ switch(sizeof(variable)) { \ case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ default: \ __bad_size_call_parameter(); break; \ } \ pscr2_ret__; \ }) /* * Special handling for cmpxchg_double. cmpxchg_double is passed two * percpu variables. The first has to be aligned to a double word * boundary and the second has to follow directly thereafter. * We enforce this on all architectures even if they don't support * a double cmpxchg instruction, since it's a cheap requirement, and it * avoids breaking the requirement for architectures with the instruction. */ #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ ({ \ bool pdcrb_ret__; \ __verify_pcpu_ptr(&pcp1); \ BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1))); \ VM_BUG_ON((unsigned long)(&pcp2) != \ (unsigned long)(&pcp1) + sizeof(pcp1)); \ switch(sizeof(pcp1)) { \ case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ default: \ __bad_size_call_parameter(); break; \ } \ pdcrb_ret__; \ }) #define __pcpu_size_call(stem, variable, ...) \ do { \ __verify_pcpu_ptr(&(variable)); \ switch(sizeof(variable)) { \ case 1: stem##1(variable, __VA_ARGS__);break; \ case 2: stem##2(variable, __VA_ARGS__);break; \ case 4: stem##4(variable, __VA_ARGS__);break; \ case 8: stem##8(variable, __VA_ARGS__);break; \ default: \ __bad_size_call_parameter();break; \ } \ } while (0) /* * Optimized manipulation for memory allocated through the per cpu * allocator or for addresses of per cpu variables. * * These operation guarantee exclusivity of access for other operations * on the *same* processor. The assumption is that per cpu data is only * accessed by a single processor instance (the current one). * * The first group is used for accesses that must be done in a * preemption safe way since we know that the context is not preempt * safe. Interrupts may occur. If the interrupt modifies the variable * too then RMW actions will not be reliable. * * The arch code can provide optimized functions in two ways: * * 1. Override the function completely. F.e. define this_cpu_add(). * The arch must then ensure that the various scalar format passed * are handled correctly. * * 2. Provide functions for certain scalar sizes. F.e. provide * this_cpu_add_2() to provide per cpu atomic operations for 2 byte * sized RMW actions. If arch code does not provide operations for * a scalar size then the fallback in the generic code will be * used. */ #define _this_cpu_generic_read(pcp) \ ({ typeof(pcp) ret__; \ preempt_disable(); \ ret__ = *this_cpu_ptr(&(pcp)); \ preempt_enable(); \ ret__; \ }) #ifndef this_cpu_read # ifndef this_cpu_read_1 # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) # endif # ifndef this_cpu_read_2 # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) # endif # ifndef this_cpu_read_4 # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) # endif # ifndef this_cpu_read_8 # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) # endif # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) #endif #define _this_cpu_generic_to_op(pcp, val, op) \ do { \ preempt_disable(); \ *__this_cpu_ptr(&(pcp)) op val; \ preempt_enable(); \ } while (0) #ifndef this_cpu_write # ifndef this_cpu_write_1 # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef this_cpu_write_2 # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef this_cpu_write_4 # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef this_cpu_write_8 # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) # endif # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) #endif #ifndef this_cpu_add # ifndef this_cpu_add_1 # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef this_cpu_add_2 # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef this_cpu_add_4 # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef this_cpu_add_8 # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) # endif # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) #endif #ifndef this_cpu_sub # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(val)) #endif #ifndef this_cpu_inc # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) #endif #ifndef this_cpu_dec # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) #endif #ifndef this_cpu_and # ifndef this_cpu_and_1 # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef this_cpu_and_2 # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef this_cpu_and_4 # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef this_cpu_and_8 # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) # endif # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) #endif #ifndef this_cpu_or # ifndef this_cpu_or_1 # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef this_cpu_or_2 # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef this_cpu_or_4 # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef this_cpu_or_8 # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) # endif # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) #endif #ifndef this_cpu_xor # ifndef this_cpu_xor_1 # define this_cpu_xor_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef this_cpu_xor_2 # define this_cpu_xor_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef this_cpu_xor_4 # define this_cpu_xor_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef this_cpu_xor_8 # define this_cpu_xor_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), ^=) # endif # define this_cpu_xor(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) #endif #define _this_cpu_generic_add_return(pcp, val) \ ({ \ typeof(pcp) ret__; \ preempt_disable(); \ __this_cpu_add(pcp, val); \ ret__ = __this_cpu_read(pcp); \ preempt_enable(); \ ret__; \ }) #ifndef this_cpu_add_return # ifndef this_cpu_add_return_1 # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) # endif # ifndef this_cpu_add_return_2 # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) # endif # ifndef this_cpu_add_return_4 # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) # endif # ifndef this_cpu_add_return_8 # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) # endif # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) #endif #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) #define _this_cpu_generic_xchg(pcp, nval) \ ({ typeof(pcp) ret__; \ preempt_disable(); \ ret__ = __this_cpu_read(pcp); \ __this_cpu_write(pcp, nval); \ preempt_enable(); \ ret__; \ }) #ifndef this_cpu_xchg # ifndef this_cpu_xchg_1 # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) # endif # ifndef this_cpu_xchg_2 # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) # endif # ifndef this_cpu_xchg_4 # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) # endif # ifndef this_cpu_xchg_8 # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) # endif # define this_cpu_xchg(pcp, nval) \ __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) #endif #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ ({ typeof(pcp) ret__; \ preempt_disable(); \ ret__ = __this_cpu_read(pcp); \ if (ret__ == (oval)) \ __this_cpu_write(pcp, nval); \ preempt_enable(); \ ret__; \ }) #ifndef this_cpu_cmpxchg # ifndef this_cpu_cmpxchg_1 # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef this_cpu_cmpxchg_2 # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef this_cpu_cmpxchg_4 # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef this_cpu_cmpxchg_8 # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # define this_cpu_cmpxchg(pcp, oval, nval) \ __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) #endif /* * cmpxchg_double replaces two adjacent scalars at once. The first * two parameters are per cpu variables which have to be of the same * size. A truth value is returned to indicate success or failure * (since a double register result is difficult to handle). There is * very limited hardware support for these operations, so only certain * sizes may work. */ #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ ({ \ int ret__; \ preempt_disable(); \ ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ oval1, oval2, nval1, nval2); \ preempt_enable(); \ ret__; \ }) #ifndef this_cpu_cmpxchg_double # ifndef this_cpu_cmpxchg_double_1 # define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef this_cpu_cmpxchg_double_2 # define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef this_cpu_cmpxchg_double_4 # define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef this_cpu_cmpxchg_double_8 # define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) #endif /* * Generic percpu operations that do not require preemption handling. * Either we do not care about races or the caller has the * responsibility of handling preemptions issues. Arch code can still * override these instructions since the arch per cpu code may be more * efficient and may actually get race freeness for free (that is the * case for x86 for example). * * If there is no other protection through preempt disable and/or * disabling interupts then one of these RMW operations can show unexpected * behavior because the execution thread was rescheduled on another processor * or an interrupt occurred and the same percpu variable was modified from * the interrupt context. */ #ifndef __this_cpu_read # ifndef __this_cpu_read_1 # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) # endif # ifndef __this_cpu_read_2 # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) # endif # ifndef __this_cpu_read_4 # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) # endif # ifndef __this_cpu_read_8 # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) # endif # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) #endif #define __this_cpu_generic_to_op(pcp, val, op) \ do { \ *__this_cpu_ptr(&(pcp)) op val; \ } while (0) #ifndef __this_cpu_write # ifndef __this_cpu_write_1 # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef __this_cpu_write_2 # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef __this_cpu_write_4 # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) # endif # ifndef __this_cpu_write_8 # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) # endif # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) #endif #ifndef __this_cpu_add # ifndef __this_cpu_add_1 # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef __this_cpu_add_2 # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef __this_cpu_add_4 # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef __this_cpu_add_8 # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) # endif # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) #endif #ifndef __this_cpu_sub # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(val)) #endif #ifndef __this_cpu_inc # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) #endif #ifndef __this_cpu_dec # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) #endif #ifndef __this_cpu_and # ifndef __this_cpu_and_1 # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef __this_cpu_and_2 # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef __this_cpu_and_4 # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef __this_cpu_and_8 # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) # endif # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) #endif #ifndef __this_cpu_or # ifndef __this_cpu_or_1 # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef __this_cpu_or_2 # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef __this_cpu_or_4 # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef __this_cpu_or_8 # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) # endif # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) #endif #ifndef __this_cpu_xor # ifndef __this_cpu_xor_1 # define __this_cpu_xor_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef __this_cpu_xor_2 # define __this_cpu_xor_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef __this_cpu_xor_4 # define __this_cpu_xor_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef __this_cpu_xor_8 # define __this_cpu_xor_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), ^=) # endif # define __this_cpu_xor(pcp, val) __pcpu_size_call(__this_cpu_xor_, (pcp), (val)) #endif #define __this_cpu_generic_add_return(pcp, val) \ ({ \ __this_cpu_add(pcp, val); \ __this_cpu_read(pcp); \ }) #ifndef __this_cpu_add_return # ifndef __this_cpu_add_return_1 # define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) # endif # ifndef __this_cpu_add_return_2 # define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) # endif # ifndef __this_cpu_add_return_4 # define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) # endif # ifndef __this_cpu_add_return_8 # define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) # endif # define __this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) #endif #define __this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(val)) #define __this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) #define __this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) #define __this_cpu_generic_xchg(pcp, nval) \ ({ typeof(pcp) ret__; \ ret__ = __this_cpu_read(pcp); \ __this_cpu_write(pcp, nval); \ ret__; \ }) #ifndef __this_cpu_xchg # ifndef __this_cpu_xchg_1 # define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) # endif # ifndef __this_cpu_xchg_2 # define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) # endif # ifndef __this_cpu_xchg_4 # define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) # endif # ifndef __this_cpu_xchg_8 # define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) # endif # define __this_cpu_xchg(pcp, nval) \ __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) #endif #define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ ({ \ typeof(pcp) ret__; \ ret__ = __this_cpu_read(pcp); \ if (ret__ == (oval)) \ __this_cpu_write(pcp, nval); \ ret__; \ }) #ifndef __this_cpu_cmpxchg # ifndef __this_cpu_cmpxchg_1 # define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef __this_cpu_cmpxchg_2 # define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef __this_cpu_cmpxchg_4 # define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef __this_cpu_cmpxchg_8 # define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) # endif # define __this_cpu_cmpxchg(pcp, oval, nval) \ __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) #endif #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ ({ \ int __ret = 0; \ if (__this_cpu_read(pcp1) == (oval1) && \ __this_cpu_read(pcp2) == (oval2)) { \ __this_cpu_write(pcp1, (nval1)); \ __this_cpu_write(pcp2, (nval2)); \ __ret = 1; \ } \ (__ret); \ }) #ifndef __this_cpu_cmpxchg_double # ifndef __this_cpu_cmpxchg_double_1 # define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef __this_cpu_cmpxchg_double_2 # define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef __this_cpu_cmpxchg_double_4 # define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef __this_cpu_cmpxchg_double_8 # define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) #endif /* * IRQ safe versions of the per cpu RMW operations. Note that these operations * are *not* safe against modification of the same variable from another * processors (which one gets when using regular atomic operations) * They are guaranteed to be atomic vs. local interrupts and * preemption only. */ #define irqsafe_cpu_generic_to_op(pcp, val, op) \ do { \ unsigned long flags; \ local_irq_save(flags); \ *__this_cpu_ptr(&(pcp)) op val; \ local_irq_restore(flags); \ } while (0) #ifndef irqsafe_cpu_add # ifndef irqsafe_cpu_add_1 # define irqsafe_cpu_add_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef irqsafe_cpu_add_2 # define irqsafe_cpu_add_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef irqsafe_cpu_add_4 # define irqsafe_cpu_add_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) # endif # ifndef irqsafe_cpu_add_8 # define irqsafe_cpu_add_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), +=) # endif # define irqsafe_cpu_add(pcp, val) __pcpu_size_call(irqsafe_cpu_add_, (pcp), (val)) #endif #ifndef irqsafe_cpu_sub # define irqsafe_cpu_sub(pcp, val) irqsafe_cpu_add((pcp), -(val)) #endif #ifndef irqsafe_cpu_inc # define irqsafe_cpu_inc(pcp) irqsafe_cpu_add((pcp), 1) #endif #ifndef irqsafe_cpu_dec # define irqsafe_cpu_dec(pcp) irqsafe_cpu_sub((pcp), 1) #endif #ifndef irqsafe_cpu_and # ifndef irqsafe_cpu_and_1 # define irqsafe_cpu_and_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef irqsafe_cpu_and_2 # define irqsafe_cpu_and_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef irqsafe_cpu_and_4 # define irqsafe_cpu_and_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) # endif # ifndef irqsafe_cpu_and_8 # define irqsafe_cpu_and_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), &=) # endif # define irqsafe_cpu_and(pcp, val) __pcpu_size_call(irqsafe_cpu_and_, (val)) #endif #ifndef irqsafe_cpu_or # ifndef irqsafe_cpu_or_1 # define irqsafe_cpu_or_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef irqsafe_cpu_or_2 # define irqsafe_cpu_or_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef irqsafe_cpu_or_4 # define irqsafe_cpu_or_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) # endif # ifndef irqsafe_cpu_or_8 # define irqsafe_cpu_or_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), |=) # endif # define irqsafe_cpu_or(pcp, val) __pcpu_size_call(irqsafe_cpu_or_, (val)) #endif #ifndef irqsafe_cpu_xor # ifndef irqsafe_cpu_xor_1 # define irqsafe_cpu_xor_1(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef irqsafe_cpu_xor_2 # define irqsafe_cpu_xor_2(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef irqsafe_cpu_xor_4 # define irqsafe_cpu_xor_4(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) # endif # ifndef irqsafe_cpu_xor_8 # define irqsafe_cpu_xor_8(pcp, val) irqsafe_cpu_generic_to_op((pcp), (val), ^=) # endif # define irqsafe_cpu_xor(pcp, val) __pcpu_size_call(irqsafe_cpu_xor_, (val)) #endif #define irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) \ ({ \ typeof(pcp) ret__; \ unsigned long flags; \ local_irq_save(flags); \ ret__ = __this_cpu_read(pcp); \ if (ret__ == (oval)) \ __this_cpu_write(pcp, nval); \ local_irq_restore(flags); \ ret__; \ }) #ifndef irqsafe_cpu_cmpxchg # ifndef irqsafe_cpu_cmpxchg_1 # define irqsafe_cpu_cmpxchg_1(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef irqsafe_cpu_cmpxchg_2 # define irqsafe_cpu_cmpxchg_2(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef irqsafe_cpu_cmpxchg_4 # define irqsafe_cpu_cmpxchg_4(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) # endif # ifndef irqsafe_cpu_cmpxchg_8 # define irqsafe_cpu_cmpxchg_8(pcp, oval, nval) irqsafe_cpu_generic_cmpxchg(pcp, oval, nval) # endif # define irqsafe_cpu_cmpxchg(pcp, oval, nval) \ __pcpu_size_call_return2(irqsafe_cpu_cmpxchg_, (pcp), oval, nval) #endif #define irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ ({ \ int ret__; \ unsigned long flags; \ local_irq_save(flags); \ ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ oval1, oval2, nval1, nval2); \ local_irq_restore(flags); \ ret__; \ }) #ifndef irqsafe_cpu_cmpxchg_double # ifndef irqsafe_cpu_cmpxchg_double_1 # define irqsafe_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef irqsafe_cpu_cmpxchg_double_2 # define irqsafe_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef irqsafe_cpu_cmpxchg_double_4 # define irqsafe_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # ifndef irqsafe_cpu_cmpxchg_double_8 # define irqsafe_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ irqsafe_generic_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) # endif # define irqsafe_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ __pcpu_double_call_return_bool(irqsafe_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) #endif #endif /* __LINUX_PERCPU_H */ |