Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_PERCPU_H |
| 2 | #define __LINUX_PERCPU_H |
Martin Peschke | 7ff6f08 | 2006-09-25 23:31:21 -0700 | [diff] [blame] | 3 | |
Sasha Levin | 309381fea | 2014-01-23 15:52:54 -0800 | [diff] [blame] | 4 | #include <linux/mmdebug.h> |
Robert P. J. Day | 0a3021f | 2007-07-15 23:39:57 -0700 | [diff] [blame] | 5 | #include <linux/preempt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/smp.h> |
Martin Peschke | 7ff6f08 | 2006-09-25 23:31:21 -0700 | [diff] [blame] | 7 | #include <linux/cpumask.h> |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 8 | #include <linux/pfn.h> |
Tejun Heo | de380b5 | 2010-03-24 17:06:43 +0900 | [diff] [blame] | 9 | #include <linux/init.h> |
Martin Peschke | 7ff6f08 | 2006-09-25 23:31:21 -0700 | [diff] [blame] | 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <asm/percpu.h> |
| 12 | |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 13 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
Jeremy Fitzhardinge | b00742d3 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 14 | #ifdef CONFIG_MODULES |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 15 | #define PERCPU_MODULE_RESERVE (8 << 10) |
Jeremy Fitzhardinge | b00742d3 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 16 | #else |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 17 | #define PERCPU_MODULE_RESERVE 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #endif |
| 19 | |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 20 | #ifndef PERCPU_ENOUGH_ROOM |
Jeremy Fitzhardinge | b00742d3 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 21 | #define PERCPU_ENOUGH_ROOM \ |
Tejun Heo | 6a24290 | 2009-03-06 14:33:58 +0900 | [diff] [blame] | 22 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
| 23 | PERCPU_MODULE_RESERVE) |
| 24 | #endif |
Jeremy Fitzhardinge | b00742d3 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 25 | |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 26 | /* |
| 27 | * Must be an lvalue. Since @var must be a simple identifier, |
| 28 | * we force a syntax error here if it isn't. |
| 29 | */ |
| 30 | #define get_cpu_var(var) (*({ \ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 31 | preempt_disable(); \ |
Christoph Lameter | fdb9c29 | 2014-04-15 12:39:14 -0500 | [diff] [blame] | 32 | this_cpu_ptr(&var); })) |
Tejun Heo | f7b64fe | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 33 | |
Rusty Russell | e0fdb0e | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 34 | /* |
| 35 | * The weird & is necessary because sparse considers (void)(var) to be |
| 36 | * a direct dereference of percpu variable (var). |
| 37 | */ |
Tejun Heo | f7b64fe | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 38 | #define put_cpu_var(var) do { \ |
Rusty Russell | e0fdb0e | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 39 | (void)&(var); \ |
Tejun Heo | f7b64fe | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 40 | preempt_enable(); \ |
| 41 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Peter Zijlstra | 8b8e2ec | 2010-09-16 19:21:28 +0200 | [diff] [blame] | 43 | #define get_cpu_ptr(var) ({ \ |
| 44 | preempt_disable(); \ |
| 45 | this_cpu_ptr(var); }) |
| 46 | |
| 47 | #define put_cpu_ptr(var) do { \ |
| 48 | (void)(var); \ |
| 49 | preempt_enable(); \ |
| 50 | } while (0) |
| 51 | |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 52 | /* minimum unit size, also is the maximum supported allocation size */ |
Tejun Heo | 6abad5a | 2010-09-03 18:22:47 +0200 | [diff] [blame] | 53 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 54 | |
| 55 | /* |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 56 | * Percpu allocator can serve percpu allocations before slab is |
| 57 | * initialized which allows slab to depend on the percpu allocator. |
| 58 | * The following two parameters decide how much resource to |
| 59 | * preallocate for this. Keep PERCPU_DYNAMIC_RESERVE equal to or |
| 60 | * larger than PERCPU_DYNAMIC_EARLY_SIZE. |
| 61 | */ |
| 62 | #define PERCPU_DYNAMIC_EARLY_SLOTS 128 |
| 63 | #define PERCPU_DYNAMIC_EARLY_SIZE (12 << 10) |
| 64 | |
| 65 | /* |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 66 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy |
Tejun Heo | 6b19b0c | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 67 | * back on the first chunk for dynamic percpu allocation if arch is |
| 68 | * manually allocating and mapping it for faster access (as a part of |
| 69 | * large page mapping for example). |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 70 | * |
Tejun Heo | 6b19b0c | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 71 | * The following values give between one and two pages of free space |
| 72 | * after typical minimal boot (2-way SMP, single disk and NIC) with |
| 73 | * both defconfig and a distro config on x86_64 and 32. More |
| 74 | * intelligent way to determine this would be nice. |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 75 | */ |
Tejun Heo | 6b19b0c | 2009-03-06 14:33:59 +0900 | [diff] [blame] | 76 | #if BITS_PER_LONG > 32 |
| 77 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) |
| 78 | #else |
| 79 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) |
| 80 | #endif |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 81 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 82 | extern void *pcpu_base_addr; |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 83 | extern const unsigned long *pcpu_unit_offsets; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 84 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 85 | struct pcpu_group_info { |
| 86 | int nr_units; /* aligned # of units */ |
| 87 | unsigned long base_offset; /* base address offset */ |
| 88 | unsigned int *cpu_map; /* unit->cpu map, empty |
| 89 | * entries contain NR_CPUS */ |
| 90 | }; |
| 91 | |
| 92 | struct pcpu_alloc_info { |
| 93 | size_t static_size; |
| 94 | size_t reserved_size; |
| 95 | size_t dyn_size; |
| 96 | size_t unit_size; |
| 97 | size_t atom_size; |
| 98 | size_t alloc_size; |
| 99 | size_t __ai_size; /* internal, don't use */ |
| 100 | int nr_groups; /* 0 if grouping unnecessary */ |
| 101 | struct pcpu_group_info groups[]; |
| 102 | }; |
| 103 | |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 104 | enum pcpu_fc { |
| 105 | PCPU_FC_AUTO, |
| 106 | PCPU_FC_EMBED, |
| 107 | PCPU_FC_PAGE, |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 108 | |
| 109 | PCPU_FC_NR, |
| 110 | }; |
Andi Kleen | 17f3609 | 2012-10-04 17:12:07 -0700 | [diff] [blame] | 111 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
Tejun Heo | f58dc01 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 112 | |
| 113 | extern enum pcpu_fc pcpu_chosen_fc; |
| 114 | |
Tejun Heo | 3cbc856 | 2009-08-14 15:00:50 +0900 | [diff] [blame] | 115 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
| 116 | size_t align); |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 117 | typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size); |
| 118 | typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr); |
Tejun Heo | a530b79 | 2009-07-04 08:11:00 +0900 | [diff] [blame] | 119 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 120 | |
Tejun Heo | fd1e8a1 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 121 | extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups, |
| 122 | int nr_units); |
| 123 | extern void __init pcpu_free_alloc_info(struct pcpu_alloc_info *ai); |
Tejun Heo | 033e48f | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 124 | |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 125 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
| 126 | void *base_addr); |
Tejun Heo | 8d408b4 | 2009-02-24 11:57:21 +0900 | [diff] [blame] | 127 | |
Tejun Heo | 08fc458 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 128 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
Tejun Heo | 4ba6ce2 | 2010-06-27 18:49:59 +0200 | [diff] [blame] | 129 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
Tejun Heo | c8826dd | 2009-08-14 15:00:52 +0900 | [diff] [blame] | 130 | size_t atom_size, |
| 131 | pcpu_fc_cpu_distance_fn_t cpu_distance_fn, |
| 132 | pcpu_fc_alloc_fn_t alloc_fn, |
| 133 | pcpu_fc_free_fn_t free_fn); |
Tejun Heo | 08fc458 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 134 | #endif |
Tejun Heo | 66c3a75 | 2009-03-10 16:27:48 +0900 | [diff] [blame] | 135 | |
Tejun Heo | 08fc458 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 136 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
Tejun Heo | fb435d5 | 2009-08-14 15:00:51 +0900 | [diff] [blame] | 137 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 138 | pcpu_fc_alloc_fn_t alloc_fn, |
| 139 | pcpu_fc_free_fn_t free_fn, |
| 140 | pcpu_fc_populate_pte_fn_t populate_pte_fn); |
Tejun Heo | 08fc458 | 2009-08-14 15:00:49 +0900 | [diff] [blame] | 141 | #endif |
Tejun Heo | d4b95f8 | 2009-07-04 08:10:59 +0900 | [diff] [blame] | 142 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 143 | /* |
| 144 | * Use this to get to a cpu's version of the per-cpu object |
| 145 | * dynamically allocated. Non-atomic access to the current CPU's |
| 146 | * version should probably be combined with get_cpu()/put_cpu(). |
| 147 | */ |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 148 | #ifdef CONFIG_SMP |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 149 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 150 | #else |
| 151 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) |
| 152 | #endif |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 153 | |
Rusty Russell | e0fdb0e | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 154 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 155 | extern bool is_kernel_percpu_address(unsigned long addr); |
Tejun Heo | f2a8205 | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 156 | |
Tejun Heo | bbddff0 | 2010-09-03 18:22:48 +0200 | [diff] [blame] | 157 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 158 | extern void __init setup_per_cpu_areas(void); |
| 159 | #endif |
Tejun Heo | 099a19d | 2010-06-27 18:50:00 +0200 | [diff] [blame] | 160 | extern void __init percpu_init_late(void); |
Tejun Heo | e74e396 | 2009-03-30 19:07:44 +0900 | [diff] [blame] | 161 | |
Tejun Heo | de380b5 | 2010-03-24 17:06:43 +0900 | [diff] [blame] | 162 | extern void __percpu *__alloc_percpu(size_t size, size_t align); |
| 163 | extern void free_percpu(void __percpu *__pdata); |
| 164 | extern phys_addr_t per_cpu_ptr_to_phys(void *addr); |
| 165 | |
Tejun Heo | 64ef291 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 166 | #define alloc_percpu(type) \ |
Rusty Russell | e0fdb0e | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 167 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
Tejun Heo | f2a8205 | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 168 | |
Tejun Heo | 066123a | 2009-04-10 12:02:40 -0700 | [diff] [blame] | 169 | /* |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 170 | * Branching function to split up a function into a set of functions that |
| 171 | * are called for different scalar sizes of the objects handled. |
| 172 | */ |
| 173 | |
| 174 | extern void __bad_size_call_parameter(void); |
| 175 | |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 176 | #ifdef CONFIG_DEBUG_PREEMPT |
| 177 | extern void __this_cpu_preempt_check(const char *op); |
| 178 | #else |
| 179 | static inline void __this_cpu_preempt_check(const char *op) { } |
| 180 | #endif |
| 181 | |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 182 | #define __pcpu_size_call_return(stem, variable) \ |
| 183 | ({ typeof(variable) pscr_ret__; \ |
Tejun Heo | 545695f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 184 | __verify_pcpu_ptr(&(variable)); \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 185 | switch(sizeof(variable)) { \ |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 186 | case 1: pscr_ret__ = stem##1(variable);break; \ |
| 187 | case 2: pscr_ret__ = stem##2(variable);break; \ |
| 188 | case 4: pscr_ret__ = stem##4(variable);break; \ |
| 189 | case 8: pscr_ret__ = stem##8(variable);break; \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 190 | default: \ |
| 191 | __bad_size_call_parameter();break; \ |
| 192 | } \ |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 193 | pscr_ret__; \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 194 | }) |
| 195 | |
Christoph Lameter | a663fff | 2010-12-06 11:39:59 -0600 | [diff] [blame] | 196 | #define __pcpu_size_call_return2(stem, variable, ...) \ |
| 197 | ({ \ |
| 198 | typeof(variable) pscr2_ret__; \ |
| 199 | __verify_pcpu_ptr(&(variable)); \ |
| 200 | switch(sizeof(variable)) { \ |
| 201 | case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ |
| 202 | case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ |
| 203 | case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ |
| 204 | case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ |
| 205 | default: \ |
| 206 | __bad_size_call_parameter(); break; \ |
| 207 | } \ |
| 208 | pscr2_ret__; \ |
| 209 | }) |
| 210 | |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 211 | /* |
| 212 | * Special handling for cmpxchg_double. cmpxchg_double is passed two |
| 213 | * percpu variables. The first has to be aligned to a double word |
| 214 | * boundary and the second has to follow directly thereafter. |
Chris Metcalf | d4d84fe | 2011-06-02 10:19:41 -0400 | [diff] [blame] | 215 | * We enforce this on all architectures even if they don't support |
| 216 | * a double cmpxchg instruction, since it's a cheap requirement, and it |
| 217 | * avoids breaking the requirement for architectures with the instruction. |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 218 | */ |
| 219 | #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ |
| 220 | ({ \ |
| 221 | bool pdcrb_ret__; \ |
| 222 | __verify_pcpu_ptr(&pcp1); \ |
| 223 | BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ |
| 224 | VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1))); \ |
| 225 | VM_BUG_ON((unsigned long)(&pcp2) != \ |
| 226 | (unsigned long)(&pcp1) + sizeof(pcp1)); \ |
| 227 | switch(sizeof(pcp1)) { \ |
| 228 | case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ |
| 229 | case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ |
| 230 | case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ |
| 231 | case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ |
| 232 | default: \ |
| 233 | __bad_size_call_parameter(); break; \ |
| 234 | } \ |
| 235 | pdcrb_ret__; \ |
| 236 | }) |
| 237 | |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 238 | #define __pcpu_size_call(stem, variable, ...) \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 239 | do { \ |
Tejun Heo | 545695f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 240 | __verify_pcpu_ptr(&(variable)); \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 241 | switch(sizeof(variable)) { \ |
| 242 | case 1: stem##1(variable, __VA_ARGS__);break; \ |
| 243 | case 2: stem##2(variable, __VA_ARGS__);break; \ |
| 244 | case 4: stem##4(variable, __VA_ARGS__);break; \ |
| 245 | case 8: stem##8(variable, __VA_ARGS__);break; \ |
| 246 | default: \ |
| 247 | __bad_size_call_parameter();break; \ |
| 248 | } \ |
| 249 | } while (0) |
| 250 | |
| 251 | /* |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 252 | * this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com> |
| 253 | * |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 254 | * Optimized manipulation for memory allocated through the per cpu |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 255 | * allocator or for addresses of per cpu variables. |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 256 | * |
| 257 | * These operation guarantee exclusivity of access for other operations |
| 258 | * on the *same* processor. The assumption is that per cpu data is only |
| 259 | * accessed by a single processor instance (the current one). |
| 260 | * |
| 261 | * The first group is used for accesses that must be done in a |
| 262 | * preemption safe way since we know that the context is not preempt |
| 263 | * safe. Interrupts may occur. If the interrupt modifies the variable |
| 264 | * too then RMW actions will not be reliable. |
| 265 | * |
| 266 | * The arch code can provide optimized functions in two ways: |
| 267 | * |
| 268 | * 1. Override the function completely. F.e. define this_cpu_add(). |
| 269 | * The arch must then ensure that the various scalar format passed |
| 270 | * are handled correctly. |
| 271 | * |
| 272 | * 2. Provide functions for certain scalar sizes. F.e. provide |
| 273 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte |
| 274 | * sized RMW actions. If arch code does not provide operations for |
| 275 | * a scalar size then the fallback in the generic code will be |
| 276 | * used. |
| 277 | */ |
| 278 | |
| 279 | #define _this_cpu_generic_read(pcp) \ |
| 280 | ({ typeof(pcp) ret__; \ |
| 281 | preempt_disable(); \ |
| 282 | ret__ = *this_cpu_ptr(&(pcp)); \ |
| 283 | preempt_enable(); \ |
| 284 | ret__; \ |
| 285 | }) |
| 286 | |
| 287 | #ifndef this_cpu_read |
| 288 | # ifndef this_cpu_read_1 |
| 289 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) |
| 290 | # endif |
| 291 | # ifndef this_cpu_read_2 |
| 292 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) |
| 293 | # endif |
| 294 | # ifndef this_cpu_read_4 |
| 295 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) |
| 296 | # endif |
| 297 | # ifndef this_cpu_read_8 |
| 298 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) |
| 299 | # endif |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 300 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 301 | #endif |
| 302 | |
| 303 | #define _this_cpu_generic_to_op(pcp, val, op) \ |
| 304 | do { \ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 305 | unsigned long flags; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 306 | raw_local_irq_save(flags); \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 307 | *raw_cpu_ptr(&(pcp)) op val; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 308 | raw_local_irq_restore(flags); \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 309 | } while (0) |
| 310 | |
| 311 | #ifndef this_cpu_write |
| 312 | # ifndef this_cpu_write_1 |
| 313 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
| 314 | # endif |
| 315 | # ifndef this_cpu_write_2 |
| 316 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
| 317 | # endif |
| 318 | # ifndef this_cpu_write_4 |
| 319 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
| 320 | # endif |
| 321 | # ifndef this_cpu_write_8 |
| 322 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) |
| 323 | # endif |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 324 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 325 | #endif |
| 326 | |
| 327 | #ifndef this_cpu_add |
| 328 | # ifndef this_cpu_add_1 |
| 329 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
| 330 | # endif |
| 331 | # ifndef this_cpu_add_2 |
| 332 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
| 333 | # endif |
| 334 | # ifndef this_cpu_add_4 |
| 335 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
| 336 | # endif |
| 337 | # ifndef this_cpu_add_8 |
| 338 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) |
| 339 | # endif |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 340 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 341 | #endif |
| 342 | |
| 343 | #ifndef this_cpu_sub |
Greg Thelen | bd09d9a | 2013-10-30 13:56:20 -0700 | [diff] [blame] | 344 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(typeof(pcp))(val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 345 | #endif |
| 346 | |
| 347 | #ifndef this_cpu_inc |
| 348 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) |
| 349 | #endif |
| 350 | |
| 351 | #ifndef this_cpu_dec |
| 352 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) |
| 353 | #endif |
| 354 | |
| 355 | #ifndef this_cpu_and |
| 356 | # ifndef this_cpu_and_1 |
| 357 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
| 358 | # endif |
| 359 | # ifndef this_cpu_and_2 |
| 360 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
| 361 | # endif |
| 362 | # ifndef this_cpu_and_4 |
| 363 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
| 364 | # endif |
| 365 | # ifndef this_cpu_and_8 |
| 366 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) |
| 367 | # endif |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 368 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 369 | #endif |
| 370 | |
| 371 | #ifndef this_cpu_or |
| 372 | # ifndef this_cpu_or_1 |
| 373 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
| 374 | # endif |
| 375 | # ifndef this_cpu_or_2 |
| 376 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
| 377 | # endif |
| 378 | # ifndef this_cpu_or_4 |
| 379 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
| 380 | # endif |
| 381 | # ifndef this_cpu_or_8 |
| 382 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) |
| 383 | # endif |
Tejun Heo | 0f5e481 | 2009-10-29 22:34:12 +0900 | [diff] [blame] | 384 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 385 | #endif |
| 386 | |
Tejun Heo | 4030477 | 2010-12-17 15:47:04 +0100 | [diff] [blame] | 387 | #define _this_cpu_generic_add_return(pcp, val) \ |
| 388 | ({ \ |
| 389 | typeof(pcp) ret__; \ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 390 | unsigned long flags; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 391 | raw_local_irq_save(flags); \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 392 | raw_cpu_add(pcp, val); \ |
| 393 | ret__ = raw_cpu_read(pcp); \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 394 | raw_local_irq_restore(flags); \ |
Tejun Heo | 4030477 | 2010-12-17 15:47:04 +0100 | [diff] [blame] | 395 | ret__; \ |
| 396 | }) |
| 397 | |
| 398 | #ifndef this_cpu_add_return |
| 399 | # ifndef this_cpu_add_return_1 |
| 400 | # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) |
| 401 | # endif |
| 402 | # ifndef this_cpu_add_return_2 |
| 403 | # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) |
| 404 | # endif |
| 405 | # ifndef this_cpu_add_return_4 |
| 406 | # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) |
| 407 | # endif |
| 408 | # ifndef this_cpu_add_return_8 |
| 409 | # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) |
| 410 | # endif |
| 411 | # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) |
| 412 | #endif |
| 413 | |
Greg Thelen | bd09d9a | 2013-10-30 13:56:20 -0700 | [diff] [blame] | 414 | #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(typeof(pcp))(val)) |
Tejun Heo | 4030477 | 2010-12-17 15:47:04 +0100 | [diff] [blame] | 415 | #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) |
| 416 | #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) |
| 417 | |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 418 | #define _this_cpu_generic_xchg(pcp, nval) \ |
| 419 | ({ typeof(pcp) ret__; \ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 420 | unsigned long flags; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 421 | raw_local_irq_save(flags); \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 422 | ret__ = raw_cpu_read(pcp); \ |
| 423 | raw_cpu_write(pcp, nval); \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 424 | raw_local_irq_restore(flags); \ |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 425 | ret__; \ |
| 426 | }) |
| 427 | |
| 428 | #ifndef this_cpu_xchg |
| 429 | # ifndef this_cpu_xchg_1 |
| 430 | # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
| 431 | # endif |
| 432 | # ifndef this_cpu_xchg_2 |
| 433 | # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
| 434 | # endif |
| 435 | # ifndef this_cpu_xchg_4 |
| 436 | # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
| 437 | # endif |
| 438 | # ifndef this_cpu_xchg_8 |
| 439 | # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) |
| 440 | # endif |
| 441 | # define this_cpu_xchg(pcp, nval) \ |
| 442 | __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) |
| 443 | #endif |
| 444 | |
| 445 | #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 446 | ({ \ |
| 447 | typeof(pcp) ret__; \ |
| 448 | unsigned long flags; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 449 | raw_local_irq_save(flags); \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 450 | ret__ = raw_cpu_read(pcp); \ |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 451 | if (ret__ == (oval)) \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 452 | raw_cpu_write(pcp, nval); \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 453 | raw_local_irq_restore(flags); \ |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 454 | ret__; \ |
| 455 | }) |
| 456 | |
| 457 | #ifndef this_cpu_cmpxchg |
| 458 | # ifndef this_cpu_cmpxchg_1 |
| 459 | # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
| 460 | # endif |
| 461 | # ifndef this_cpu_cmpxchg_2 |
| 462 | # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
| 463 | # endif |
| 464 | # ifndef this_cpu_cmpxchg_4 |
| 465 | # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
| 466 | # endif |
| 467 | # ifndef this_cpu_cmpxchg_8 |
| 468 | # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) |
| 469 | # endif |
| 470 | # define this_cpu_cmpxchg(pcp, oval, nval) \ |
| 471 | __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) |
| 472 | #endif |
| 473 | |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 474 | /* |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 475 | * cmpxchg_double replaces two adjacent scalars at once. The first |
| 476 | * two parameters are per cpu variables which have to be of the same |
| 477 | * size. A truth value is returned to indicate success or failure |
| 478 | * (since a double register result is difficult to handle). There is |
| 479 | * very limited hardware support for these operations, so only certain |
| 480 | * sizes may work. |
| 481 | */ |
| 482 | #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 483 | ({ \ |
| 484 | int ret__; \ |
Christoph Lameter | 933393f | 2011-12-22 11:58:51 -0600 | [diff] [blame] | 485 | unsigned long flags; \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 486 | raw_local_irq_save(flags); \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 487 | ret__ = raw_cpu_generic_cmpxchg_double(pcp1, pcp2, \ |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 488 | oval1, oval2, nval1, nval2); \ |
Ming Lei | e920d59 | 2012-02-15 16:54:38 +0800 | [diff] [blame] | 489 | raw_local_irq_restore(flags); \ |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 490 | ret__; \ |
| 491 | }) |
| 492 | |
| 493 | #ifndef this_cpu_cmpxchg_double |
| 494 | # ifndef this_cpu_cmpxchg_double_1 |
| 495 | # define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 496 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 497 | # endif |
| 498 | # ifndef this_cpu_cmpxchg_double_2 |
| 499 | # define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 500 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 501 | # endif |
| 502 | # ifndef this_cpu_cmpxchg_double_4 |
| 503 | # define this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 504 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 505 | # endif |
| 506 | # ifndef this_cpu_cmpxchg_double_8 |
| 507 | # define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 508 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 509 | # endif |
| 510 | # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 511 | __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) |
| 512 | #endif |
| 513 | |
| 514 | /* |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 515 | * Generic percpu operations for contexts where we do not want to do |
| 516 | * any checks for preemptiosn. |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 517 | * |
| 518 | * If there is no other protection through preempt disable and/or |
| 519 | * disabling interupts then one of these RMW operations can show unexpected |
| 520 | * behavior because the execution thread was rescheduled on another processor |
| 521 | * or an interrupt occurred and the same percpu variable was modified from |
| 522 | * the interrupt context. |
| 523 | */ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 524 | #ifndef raw_cpu_read |
| 525 | # ifndef raw_cpu_read_1 |
| 526 | # define raw_cpu_read_1(pcp) (*raw_cpu_ptr(&(pcp))) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 527 | # endif |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 528 | # ifndef raw_cpu_read_2 |
| 529 | # define raw_cpu_read_2(pcp) (*raw_cpu_ptr(&(pcp))) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 530 | # endif |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 531 | # ifndef raw_cpu_read_4 |
| 532 | # define raw_cpu_read_4(pcp) (*raw_cpu_ptr(&(pcp))) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 533 | # endif |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 534 | # ifndef raw_cpu_read_8 |
| 535 | # define raw_cpu_read_8(pcp) (*raw_cpu_ptr(&(pcp))) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 536 | # endif |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 537 | # define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, (pcp)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 538 | #endif |
| 539 | |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 540 | #define raw_cpu_generic_to_op(pcp, val, op) \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 541 | do { \ |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 542 | *raw_cpu_ptr(&(pcp)) op val; \ |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 543 | } while (0) |
| 544 | |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 545 | |
| 546 | #ifndef raw_cpu_write |
| 547 | # ifndef raw_cpu_write_1 |
| 548 | # define raw_cpu_write_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) |
| 549 | # endif |
| 550 | # ifndef raw_cpu_write_2 |
| 551 | # define raw_cpu_write_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) |
| 552 | # endif |
| 553 | # ifndef raw_cpu_write_4 |
| 554 | # define raw_cpu_write_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) |
| 555 | # endif |
| 556 | # ifndef raw_cpu_write_8 |
| 557 | # define raw_cpu_write_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), =) |
| 558 | # endif |
| 559 | # define raw_cpu_write(pcp, val) __pcpu_size_call(raw_cpu_write_, (pcp), (val)) |
| 560 | #endif |
| 561 | |
| 562 | #ifndef raw_cpu_add |
| 563 | # ifndef raw_cpu_add_1 |
| 564 | # define raw_cpu_add_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) |
| 565 | # endif |
| 566 | # ifndef raw_cpu_add_2 |
| 567 | # define raw_cpu_add_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) |
| 568 | # endif |
| 569 | # ifndef raw_cpu_add_4 |
| 570 | # define raw_cpu_add_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) |
| 571 | # endif |
| 572 | # ifndef raw_cpu_add_8 |
| 573 | # define raw_cpu_add_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), +=) |
| 574 | # endif |
| 575 | # define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, (pcp), (val)) |
| 576 | #endif |
| 577 | |
| 578 | #ifndef raw_cpu_sub |
| 579 | # define raw_cpu_sub(pcp, val) raw_cpu_add((pcp), -(val)) |
| 580 | #endif |
| 581 | |
| 582 | #ifndef raw_cpu_inc |
| 583 | # define raw_cpu_inc(pcp) raw_cpu_add((pcp), 1) |
| 584 | #endif |
| 585 | |
| 586 | #ifndef raw_cpu_dec |
| 587 | # define raw_cpu_dec(pcp) raw_cpu_sub((pcp), 1) |
| 588 | #endif |
| 589 | |
| 590 | #ifndef raw_cpu_and |
| 591 | # ifndef raw_cpu_and_1 |
| 592 | # define raw_cpu_and_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) |
| 593 | # endif |
| 594 | # ifndef raw_cpu_and_2 |
| 595 | # define raw_cpu_and_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) |
| 596 | # endif |
| 597 | # ifndef raw_cpu_and_4 |
| 598 | # define raw_cpu_and_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) |
| 599 | # endif |
| 600 | # ifndef raw_cpu_and_8 |
| 601 | # define raw_cpu_and_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), &=) |
| 602 | # endif |
| 603 | # define raw_cpu_and(pcp, val) __pcpu_size_call(raw_cpu_and_, (pcp), (val)) |
| 604 | #endif |
| 605 | |
| 606 | #ifndef raw_cpu_or |
| 607 | # ifndef raw_cpu_or_1 |
| 608 | # define raw_cpu_or_1(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) |
| 609 | # endif |
| 610 | # ifndef raw_cpu_or_2 |
| 611 | # define raw_cpu_or_2(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) |
| 612 | # endif |
| 613 | # ifndef raw_cpu_or_4 |
| 614 | # define raw_cpu_or_4(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) |
| 615 | # endif |
| 616 | # ifndef raw_cpu_or_8 |
| 617 | # define raw_cpu_or_8(pcp, val) raw_cpu_generic_to_op((pcp), (val), |=) |
| 618 | # endif |
| 619 | # define raw_cpu_or(pcp, val) __pcpu_size_call(raw_cpu_or_, (pcp), (val)) |
| 620 | #endif |
| 621 | |
| 622 | #define raw_cpu_generic_add_return(pcp, val) \ |
| 623 | ({ \ |
| 624 | raw_cpu_add(pcp, val); \ |
| 625 | raw_cpu_read(pcp); \ |
| 626 | }) |
| 627 | |
| 628 | #ifndef raw_cpu_add_return |
| 629 | # ifndef raw_cpu_add_return_1 |
| 630 | # define raw_cpu_add_return_1(pcp, val) raw_cpu_generic_add_return(pcp, val) |
| 631 | # endif |
| 632 | # ifndef raw_cpu_add_return_2 |
| 633 | # define raw_cpu_add_return_2(pcp, val) raw_cpu_generic_add_return(pcp, val) |
| 634 | # endif |
| 635 | # ifndef raw_cpu_add_return_4 |
| 636 | # define raw_cpu_add_return_4(pcp, val) raw_cpu_generic_add_return(pcp, val) |
| 637 | # endif |
| 638 | # ifndef raw_cpu_add_return_8 |
| 639 | # define raw_cpu_add_return_8(pcp, val) raw_cpu_generic_add_return(pcp, val) |
| 640 | # endif |
| 641 | # define raw_cpu_add_return(pcp, val) \ |
Paul E. McKenney | 0e98023 | 2014-04-16 10:07:09 -0700 | [diff] [blame] | 642 | __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val) |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 643 | #endif |
| 644 | |
| 645 | #define raw_cpu_sub_return(pcp, val) raw_cpu_add_return(pcp, -(typeof(pcp))(val)) |
| 646 | #define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1) |
| 647 | #define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1) |
| 648 | |
| 649 | #define raw_cpu_generic_xchg(pcp, nval) \ |
| 650 | ({ typeof(pcp) ret__; \ |
| 651 | ret__ = raw_cpu_read(pcp); \ |
| 652 | raw_cpu_write(pcp, nval); \ |
| 653 | ret__; \ |
| 654 | }) |
| 655 | |
| 656 | #ifndef raw_cpu_xchg |
| 657 | # ifndef raw_cpu_xchg_1 |
| 658 | # define raw_cpu_xchg_1(pcp, nval) raw_cpu_generic_xchg(pcp, nval) |
| 659 | # endif |
| 660 | # ifndef raw_cpu_xchg_2 |
| 661 | # define raw_cpu_xchg_2(pcp, nval) raw_cpu_generic_xchg(pcp, nval) |
| 662 | # endif |
| 663 | # ifndef raw_cpu_xchg_4 |
| 664 | # define raw_cpu_xchg_4(pcp, nval) raw_cpu_generic_xchg(pcp, nval) |
| 665 | # endif |
| 666 | # ifndef raw_cpu_xchg_8 |
| 667 | # define raw_cpu_xchg_8(pcp, nval) raw_cpu_generic_xchg(pcp, nval) |
| 668 | # endif |
| 669 | # define raw_cpu_xchg(pcp, nval) \ |
| 670 | __pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval) |
| 671 | #endif |
| 672 | |
| 673 | #define raw_cpu_generic_cmpxchg(pcp, oval, nval) \ |
| 674 | ({ \ |
| 675 | typeof(pcp) ret__; \ |
| 676 | ret__ = raw_cpu_read(pcp); \ |
| 677 | if (ret__ == (oval)) \ |
| 678 | raw_cpu_write(pcp, nval); \ |
| 679 | ret__; \ |
| 680 | }) |
| 681 | |
| 682 | #ifndef raw_cpu_cmpxchg |
| 683 | # ifndef raw_cpu_cmpxchg_1 |
| 684 | # define raw_cpu_cmpxchg_1(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) |
| 685 | # endif |
| 686 | # ifndef raw_cpu_cmpxchg_2 |
| 687 | # define raw_cpu_cmpxchg_2(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) |
| 688 | # endif |
| 689 | # ifndef raw_cpu_cmpxchg_4 |
| 690 | # define raw_cpu_cmpxchg_4(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) |
| 691 | # endif |
| 692 | # ifndef raw_cpu_cmpxchg_8 |
| 693 | # define raw_cpu_cmpxchg_8(pcp, oval, nval) raw_cpu_generic_cmpxchg(pcp, oval, nval) |
| 694 | # endif |
| 695 | # define raw_cpu_cmpxchg(pcp, oval, nval) \ |
| 696 | __pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval) |
| 697 | #endif |
| 698 | |
| 699 | #define raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 700 | ({ \ |
| 701 | int __ret = 0; \ |
| 702 | if (raw_cpu_read(pcp1) == (oval1) && \ |
| 703 | raw_cpu_read(pcp2) == (oval2)) { \ |
| 704 | raw_cpu_write(pcp1, (nval1)); \ |
| 705 | raw_cpu_write(pcp2, (nval2)); \ |
| 706 | __ret = 1; \ |
| 707 | } \ |
| 708 | (__ret); \ |
| 709 | }) |
| 710 | |
| 711 | #ifndef raw_cpu_cmpxchg_double |
| 712 | # ifndef raw_cpu_cmpxchg_double_1 |
| 713 | # define raw_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 714 | raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 715 | # endif |
| 716 | # ifndef raw_cpu_cmpxchg_double_2 |
| 717 | # define raw_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 718 | raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 719 | # endif |
| 720 | # ifndef raw_cpu_cmpxchg_double_4 |
| 721 | # define raw_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 722 | raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 723 | # endif |
| 724 | # ifndef raw_cpu_cmpxchg_double_8 |
| 725 | # define raw_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 726 | raw_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) |
| 727 | # endif |
| 728 | # define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 729 | __pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) |
| 730 | #endif |
| 731 | |
| 732 | /* |
| 733 | * Generic percpu operations for context that are safe from preemption/interrupts. |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 734 | */ |
| 735 | #ifndef __this_cpu_read |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 736 | # define __this_cpu_read(pcp) \ |
| 737 | (__this_cpu_preempt_check("read"),__pcpu_size_call_return(raw_cpu_read_, (pcp))) |
Christoph Lameter | b3ca1c1 | 2014-04-07 15:39:34 -0700 | [diff] [blame] | 738 | #endif |
| 739 | |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 740 | #ifndef __this_cpu_write |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 741 | # define __this_cpu_write(pcp, val) \ |
| 742 | do { __this_cpu_preempt_check("write"); \ |
| 743 | __pcpu_size_call(raw_cpu_write_, (pcp), (val)); \ |
| 744 | } while (0) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 745 | #endif |
| 746 | |
| 747 | #ifndef __this_cpu_add |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 748 | # define __this_cpu_add(pcp, val) \ |
| 749 | do { __this_cpu_preempt_check("add"); \ |
| 750 | __pcpu_size_call(raw_cpu_add_, (pcp), (val)); \ |
| 751 | } while (0) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 752 | #endif |
| 753 | |
| 754 | #ifndef __this_cpu_sub |
Greg Thelen | bd09d9a | 2013-10-30 13:56:20 -0700 | [diff] [blame] | 755 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(typeof(pcp))(val)) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 756 | #endif |
| 757 | |
| 758 | #ifndef __this_cpu_inc |
| 759 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) |
| 760 | #endif |
| 761 | |
| 762 | #ifndef __this_cpu_dec |
| 763 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) |
| 764 | #endif |
| 765 | |
| 766 | #ifndef __this_cpu_and |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 767 | # define __this_cpu_and(pcp, val) \ |
| 768 | do { __this_cpu_preempt_check("and"); \ |
| 769 | __pcpu_size_call(raw_cpu_and_, (pcp), (val)); \ |
| 770 | } while (0) |
| 771 | |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 772 | #endif |
| 773 | |
| 774 | #ifndef __this_cpu_or |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 775 | # define __this_cpu_or(pcp, val) \ |
| 776 | do { __this_cpu_preempt_check("or"); \ |
| 777 | __pcpu_size_call(raw_cpu_or_, (pcp), (val)); \ |
| 778 | } while (0) |
Christoph Lameter | 7340a0b | 2009-10-03 19:48:22 +0900 | [diff] [blame] | 779 | #endif |
| 780 | |
Christoph Lameter | a663fff | 2010-12-06 11:39:59 -0600 | [diff] [blame] | 781 | #ifndef __this_cpu_add_return |
Konstantin Khlebnikov | 7d96b3e | 2012-02-19 18:29:11 +0400 | [diff] [blame] | 782 | # define __this_cpu_add_return(pcp, val) \ |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 783 | (__this_cpu_preempt_check("add_return"),__pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)) |
Christoph Lameter | a663fff | 2010-12-06 11:39:59 -0600 | [diff] [blame] | 784 | #endif |
| 785 | |
Greg Thelen | bd09d9a | 2013-10-30 13:56:20 -0700 | [diff] [blame] | 786 | #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val)) |
Konstantin Khlebnikov | adb7950 | 2012-02-29 00:41:12 +0400 | [diff] [blame] | 787 | #define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1) |
| 788 | #define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1) |
Christoph Lameter | a663fff | 2010-12-06 11:39:59 -0600 | [diff] [blame] | 789 | |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 790 | #ifndef __this_cpu_xchg |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 791 | # define __this_cpu_xchg(pcp, nval) \ |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 792 | (__this_cpu_preempt_check("xchg"),__pcpu_size_call_return2(raw_cpu_xchg_, (pcp), nval)) |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 793 | #endif |
| 794 | |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 795 | #ifndef __this_cpu_cmpxchg |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 796 | # define __this_cpu_cmpxchg(pcp, oval, nval) \ |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 797 | (__this_cpu_preempt_check("cmpxchg"),__pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)) |
Christoph Lameter | 2b71244 | 2010-12-18 15:54:04 +0100 | [diff] [blame] | 798 | #endif |
| 799 | |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 800 | #ifndef __this_cpu_cmpxchg_double |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 801 | # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
Christoph Lameter | 188a814 | 2014-04-07 15:39:44 -0700 | [diff] [blame] | 802 | (__this_cpu_preempt_check("cmpxchg_double"),__pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2))) |
Christoph Lameter | 7c33433 | 2011-02-28 11:02:24 +0100 | [diff] [blame] | 803 | #endif |
| 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | #endif /* __LINUX_PERCPU_H */ |