projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __LINUX_PERCPU_H |
| 2 | #define __LINUX_PERCPU_H | |
| 7ff6f082 | 3 | |
| 309381fe | 4 | #include <linux/mmdebug.h> |
| 0a3021f4 | 5 | #include <linux/preempt.h> |
| 1da177e4 | 6 | #include <linux/smp.h> |
| 7ff6f082 | 7 | #include <linux/cpumask.h> |
| 6a242909 | 8 | #include <linux/pfn.h> |
| de380b55 | 9 | #include <linux/init.h> |
| 7ff6f082 | 10 | |
| 1da177e4 LT |
11 | #include <asm/percpu.h> |
| 12 | ||
| 6a242909 | 13 | /* enough to cover all DEFINE_PER_CPUs in modules */ |
| b00742d3 | 14 | #ifdef CONFIG_MODULES |
| 6a242909 | 15 | #define PERCPU_MODULE_RESERVE (8 << 10) |
| b00742d3 | 16 | #else |
| 6a242909 | 17 | #define PERCPU_MODULE_RESERVE 0 |
| 1da177e4 LT |
18 | #endif |
| 19 | ||
| 6a242909 | 20 | #ifndef PERCPU_ENOUGH_ROOM |
| b00742d3 | 21 | #define PERCPU_ENOUGH_ROOM \ |
| 6a242909 TH |
22 | (ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \ |
| 23 | PERCPU_MODULE_RESERVE) | |
| 24 | #endif | |
| b00742d3 | 25 | |
| 632bbfee JB |
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) (*({ \ | |
| 632bbfee JB |
31 | preempt_disable(); \ |
| 32 | &__get_cpu_var(var); })) | |
| f7b64fe8 | 33 | |
| e0fdb0e0 RR |
34 | /* |
| 35 | * The weird & is necessary because sparse considers (void)(var) to be | |
| 36 | * a direct dereference of percpu variable (var). | |
| 37 | */ | |
| f7b64fe8 | 38 | #define put_cpu_var(var) do { \ |
| e0fdb0e0 | 39 | (void)&(var); \ |
| f7b64fe8 TH |
40 | preempt_enable(); \ |
| 41 | } while (0) | |
| 1da177e4 | 42 | |
| 8b8e2ec1 PZ |
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 | ||
| 8d408b4b | 52 | /* minimum unit size, also is the maximum supported allocation size */ |
| 6abad5ac | 53 | #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) |
| 8d408b4b | 54 | |
| 099a19d9 TH |
55 | /* |
| 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 | ||
| 8d408b4b TH |
65 | /* |
| 66 | * PERCPU_DYNAMIC_RESERVE indicates the amount of free area to piggy | |
| 6b19b0c2 TH |
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). | |
| 8d408b4b | 70 | * |
| 6b19b0c2 TH |
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. | |
| 8d408b4b | 75 | */ |
| 6b19b0c2 TH |
76 | #if BITS_PER_LONG > 32 |
| 77 | #define PERCPU_DYNAMIC_RESERVE (20 << 10) | |
| 78 | #else | |
| 79 | #define PERCPU_DYNAMIC_RESERVE (12 << 10) | |
| 80 | #endif | |
| 8d408b4b | 81 | |
| fbf59bc9 | 82 | extern void *pcpu_base_addr; |
| fb435d52 | 83 | extern const unsigned long *pcpu_unit_offsets; |
| 1da177e4 | 84 | |
| fd1e8a1f TH |
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 | ||
| f58dc01b TH |
104 | enum pcpu_fc { |
| 105 | PCPU_FC_AUTO, | |
| 106 | PCPU_FC_EMBED, | |
| 107 | PCPU_FC_PAGE, | |
| f58dc01b TH |
108 | |
| 109 | PCPU_FC_NR, | |
| 110 | }; | |
| 17f3609c | 111 | extern const char * const pcpu_fc_names[PCPU_FC_NR]; |
| f58dc01b TH |
112 | |
| 113 | extern enum pcpu_fc pcpu_chosen_fc; | |
| 114 | ||
| 3cbc8565 TH |
115 | typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size, |
| 116 | size_t align); | |
| d4b95f80 TH |
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); | |
| a530b795 | 119 | typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to); |
| fbf59bc9 | 120 | |
| fd1e8a1f TH |
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); | |
| 124 | ||
| fb435d52 TH |
125 | extern int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai, |
| 126 | void *base_addr); | |
| 8d408b4b | 127 | |
| 08fc4580 | 128 | #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK |
| 4ba6ce25 | 129 | extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size, |
| c8826dd5 TH |
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); | |
| 08fc4580 | 134 | #endif |
| 66c3a757 | 135 | |
| 08fc4580 | 136 | #ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK |
| fb435d52 | 137 | extern int __init pcpu_page_first_chunk(size_t reserved_size, |
| d4b95f80 TH |
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); | |
| 08fc4580 | 141 | #endif |
| d4b95f80 | 142 | |
| f2a8205c TH |
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 | */ | |
| bbddff05 | 148 | #ifdef CONFIG_SMP |
| fbf59bc9 | 149 | #define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))) |
| bbddff05 TH |
150 | #else |
| 151 | #define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); }) | |
| 152 | #endif | |
| fbf59bc9 | 153 | |
| e0fdb0e0 | 154 | extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align); |
| 10fad5e4 | 155 | extern bool is_kernel_percpu_address(unsigned long addr); |
| 1da177e4 | 156 | |
| bbddff05 | 157 | #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) |
| e74e3962 TH |
158 | extern void __init setup_per_cpu_areas(void); |
| 159 | #endif | |
| 099a19d9 | 160 | extern void __init percpu_init_late(void); |
| e74e3962 | 161 | |
| de380b55 TH |
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 | ||
| 64ef291f | 166 | #define alloc_percpu(type) \ |
| e0fdb0e0 | 167 | (typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type)) |
| 1da177e4 | 168 | |
| 7340a0b1 CL |
169 | /* |
| 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 | ||
| 0f5e4816 TH |
176 | #define __pcpu_size_call_return(stem, variable) \ |
| 177 | ({ typeof(variable) pscr_ret__; \ | |
| 545695fb | 178 | __verify_pcpu_ptr(&(variable)); \ |
| 7340a0b1 | 179 | switch(sizeof(variable)) { \ |
| 0f5e4816 TH |
180 | case 1: pscr_ret__ = stem##1(variable);break; \ |
| 181 | case 2: pscr_ret__ = stem##2(variable);break; \ | |
| 182 | case 4: pscr_ret__ = stem##4(variable);break; \ | |
| 183 | case 8: pscr_ret__ = stem##8(variable);break; \ | |
| 7340a0b1 CL |
184 | default: \ |
| 185 | __bad_size_call_parameter();break; \ | |
| 186 | } \ | |
| 0f5e4816 | 187 | pscr_ret__; \ |
| 7340a0b1 CL |
188 | }) |
| 189 | ||
| a663ffff CL |
190 | #define __pcpu_size_call_return2(stem, variable, ...) \ |
| 191 | ({ \ | |
| 192 | typeof(variable) pscr2_ret__; \ | |
| 193 | __verify_pcpu_ptr(&(variable)); \ | |
| 194 | switch(sizeof(variable)) { \ | |
| 195 | case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \ | |
| 196 | case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \ | |
| 197 | case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \ | |
| 198 | case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \ | |
| 199 | default: \ | |
| 200 | __bad_size_call_parameter(); break; \ | |
| 201 | } \ | |
| 202 | pscr2_ret__; \ | |
| 203 | }) | |
| 204 | ||
| 7c334339 CL |
205 | /* |
| 206 | * Special handling for cmpxchg_double. cmpxchg_double is passed two | |
| 207 | * percpu variables. The first has to be aligned to a double word | |
| 208 | * boundary and the second has to follow directly thereafter. | |
| d4d84fef CM |
209 | * We enforce this on all architectures even if they don't support |
| 210 | * a double cmpxchg instruction, since it's a cheap requirement, and it | |
| 211 | * avoids breaking the requirement for architectures with the instruction. | |
| 7c334339 CL |
212 | */ |
| 213 | #define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \ | |
| 214 | ({ \ | |
| 215 | bool pdcrb_ret__; \ | |
| 216 | __verify_pcpu_ptr(&pcp1); \ | |
| 217 | BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \ | |
| 218 | VM_BUG_ON((unsigned long)(&pcp1) % (2 * sizeof(pcp1))); \ | |
| 219 | VM_BUG_ON((unsigned long)(&pcp2) != \ | |
| 220 | (unsigned long)(&pcp1) + sizeof(pcp1)); \ | |
| 221 | switch(sizeof(pcp1)) { \ | |
| 222 | case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \ | |
| 223 | case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \ | |
| 224 | case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \ | |
| 225 | case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \ | |
| 226 | default: \ | |
| 227 | __bad_size_call_parameter(); break; \ | |
| 228 | } \ | |
| 229 | pdcrb_ret__; \ | |
| 230 | }) | |
| 231 | ||
| 0f5e4816 | 232 | #define __pcpu_size_call(stem, variable, ...) \ |
| 7340a0b1 | 233 | do { \ |
| 545695fb | 234 | __verify_pcpu_ptr(&(variable)); \ |
| 7340a0b1 CL |
235 | switch(sizeof(variable)) { \ |
| 236 | case 1: stem##1(variable, __VA_ARGS__);break; \ | |
| 237 | case 2: stem##2(variable, __VA_ARGS__);break; \ | |
| 238 | case 4: stem##4(variable, __VA_ARGS__);break; \ | |
| 239 | case 8: stem##8(variable, __VA_ARGS__);break; \ | |
| 240 | default: \ | |
| 241 | __bad_size_call_parameter();break; \ | |
| 242 | } \ | |
| 243 | } while (0) | |
| 244 | ||
| 245 | /* | |
| 246 | * Optimized manipulation for memory allocated through the per cpu | |
| dd17c8f7 | 247 | * allocator or for addresses of per cpu variables. |
| 7340a0b1 CL |
248 | * |
| 249 | * These operation guarantee exclusivity of access for other operations | |
| 250 | * on the *same* processor. The assumption is that per cpu data is only | |
| 251 | * accessed by a single processor instance (the current one). | |
| 252 | * | |
| 253 | * The first group is used for accesses that must be done in a | |
| 254 | * preemption safe way since we know that the context is not preempt | |
| 255 | * safe. Interrupts may occur. If the interrupt modifies the variable | |
| 256 | * too then RMW actions will not be reliable. | |
| 257 | * | |
| 258 | * The arch code can provide optimized functions in two ways: | |
| 259 | * | |
| 260 | * 1. Override the function completely. F.e. define this_cpu_add(). | |
| 261 | * The arch must then ensure that the various scalar format passed | |
| 262 | * are handled correctly. | |
| 263 | * | |
| 264 | * 2. Provide functions for certain scalar sizes. F.e. provide | |
| 265 | * this_cpu_add_2() to provide per cpu atomic operations for 2 byte | |
| 266 | * sized RMW actions. If arch code does not provide operations for | |
| 267 | * a scalar size then the fallback in the generic code will be | |
| 268 | * used. | |
| 269 | */ | |
| 270 | ||
| 271 | #define _this_cpu_generic_read(pcp) \ | |
| 272 | ({ typeof(pcp) ret__; \ | |
| 273 | preempt_disable(); \ | |
| 274 | ret__ = *this_cpu_ptr(&(pcp)); \ | |
| 275 | preempt_enable(); \ | |
| 276 | ret__; \ | |
| 277 | }) | |
| 278 | ||
| 279 | #ifndef this_cpu_read | |
| 280 | # ifndef this_cpu_read_1 | |
| 281 | # define this_cpu_read_1(pcp) _this_cpu_generic_read(pcp) | |
| 282 | # endif | |
| 283 | # ifndef this_cpu_read_2 | |
| 284 | # define this_cpu_read_2(pcp) _this_cpu_generic_read(pcp) | |
| 285 | # endif | |
| 286 | # ifndef this_cpu_read_4 | |
| 287 | # define this_cpu_read_4(pcp) _this_cpu_generic_read(pcp) | |
| 288 | # endif | |
| 289 | # ifndef this_cpu_read_8 | |
| 290 | # define this_cpu_read_8(pcp) _this_cpu_generic_read(pcp) | |
| 291 | # endif | |
| 0f5e4816 | 292 | # define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, (pcp)) |
| 7340a0b1 CL |
293 | #endif |
| 294 | ||
| 295 | #define _this_cpu_generic_to_op(pcp, val, op) \ | |
| 296 | do { \ | |
| 933393f5 | 297 | unsigned long flags; \ |
| e920d597 | 298 | raw_local_irq_save(flags); \ |
| f7b64fe8 | 299 | *__this_cpu_ptr(&(pcp)) op val; \ |
| e920d597 | 300 | raw_local_irq_restore(flags); \ |
| 7340a0b1 CL |
301 | } while (0) |
| 302 | ||
| 303 | #ifndef this_cpu_write | |
| 304 | # ifndef this_cpu_write_1 | |
| 305 | # define this_cpu_write_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
| 306 | # endif | |
| 307 | # ifndef this_cpu_write_2 | |
| 308 | # define this_cpu_write_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
| 309 | # endif | |
| 310 | # ifndef this_cpu_write_4 | |
| 311 | # define this_cpu_write_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
| 312 | # endif | |
| 313 | # ifndef this_cpu_write_8 | |
| 314 | # define this_cpu_write_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), =) | |
| 315 | # endif | |
| 0f5e4816 | 316 | # define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, (pcp), (val)) |
| 7340a0b1 CL |
317 | #endif |
| 318 | ||
| 319 | #ifndef this_cpu_add | |
| 320 | # ifndef this_cpu_add_1 | |
| 321 | # define this_cpu_add_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
| 322 | # endif | |
| 323 | # ifndef this_cpu_add_2 | |
| 324 | # define this_cpu_add_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
| 325 | # endif | |
| 326 | # ifndef this_cpu_add_4 | |
| 327 | # define this_cpu_add_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
| 328 | # endif | |
| 329 | # ifndef this_cpu_add_8 | |
| 330 | # define this_cpu_add_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), +=) | |
| 331 | # endif | |
| 0f5e4816 | 332 | # define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, (pcp), (val)) |
| 7340a0b1 CL |
333 | #endif |
| 334 | ||
| 335 | #ifndef this_cpu_sub | |
| bd09d9a3 | 336 | # define this_cpu_sub(pcp, val) this_cpu_add((pcp), -(typeof(pcp))(val)) |
| 7340a0b1 CL |
337 | #endif |
| 338 | ||
| 339 | #ifndef this_cpu_inc | |
| 340 | # define this_cpu_inc(pcp) this_cpu_add((pcp), 1) | |
| 341 | #endif | |
| 342 | ||
| 343 | #ifndef this_cpu_dec | |
| 344 | # define this_cpu_dec(pcp) this_cpu_sub((pcp), 1) | |
| 345 | #endif | |
| 346 | ||
| 347 | #ifndef this_cpu_and | |
| 348 | # ifndef this_cpu_and_1 | |
| 349 | # define this_cpu_and_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
| 350 | # endif | |
| 351 | # ifndef this_cpu_and_2 | |
| 352 | # define this_cpu_and_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
| 353 | # endif | |
| 354 | # ifndef this_cpu_and_4 | |
| 355 | # define this_cpu_and_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
| 356 | # endif | |
| 357 | # ifndef this_cpu_and_8 | |
| 358 | # define this_cpu_and_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), &=) | |
| 359 | # endif | |
| 0f5e4816 | 360 | # define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, (pcp), (val)) |
| 7340a0b1 CL |
361 | #endif |
| 362 | ||
| 363 | #ifndef this_cpu_or | |
| 364 | # ifndef this_cpu_or_1 | |
| 365 | # define this_cpu_or_1(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
| 366 | # endif | |
| 367 | # ifndef this_cpu_or_2 | |
| 368 | # define this_cpu_or_2(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
| 369 | # endif | |
| 370 | # ifndef this_cpu_or_4 | |
| 371 | # define this_cpu_or_4(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
| 372 | # endif | |
| 373 | # ifndef this_cpu_or_8 | |
| 374 | # define this_cpu_or_8(pcp, val) _this_cpu_generic_to_op((pcp), (val), |=) | |
| 375 | # endif | |
| 0f5e4816 | 376 | # define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, (pcp), (val)) |
| 7340a0b1 CL |
377 | #endif |
| 378 | ||
| 40304775 TH |
379 | #define _this_cpu_generic_add_return(pcp, val) \ |
| 380 | ({ \ | |
| 381 | typeof(pcp) ret__; \ | |
| 933393f5 | 382 | unsigned long flags; \ |
| e920d597 | 383 | raw_local_irq_save(flags); \ |
| 40304775 TH |
384 | __this_cpu_add(pcp, val); \ |
| 385 | ret__ = __this_cpu_read(pcp); \ | |
| e920d597 | 386 | raw_local_irq_restore(flags); \ |
| 40304775 TH |
387 | ret__; \ |
| 388 | }) | |
| 389 | ||
| 390 | #ifndef this_cpu_add_return | |
| 391 | # ifndef this_cpu_add_return_1 | |
| 392 | # define this_cpu_add_return_1(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
| 393 | # endif | |
| 394 | # ifndef this_cpu_add_return_2 | |
| 395 | # define this_cpu_add_return_2(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
| 396 | # endif | |
| 397 | # ifndef this_cpu_add_return_4 | |
| 398 | # define this_cpu_add_return_4(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
| 399 | # endif | |
| 400 | # ifndef this_cpu_add_return_8 | |
| 401 | # define this_cpu_add_return_8(pcp, val) _this_cpu_generic_add_return(pcp, val) | |
| 402 | # endif | |
| 403 | # define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val) | |
| 404 | #endif | |
| 405 | ||
| bd09d9a3 | 406 | #define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(typeof(pcp))(val)) |
| 40304775 TH |
407 | #define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1) |
| 408 | #define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1) | |
| 409 | ||
| 2b712442 CL |
410 | #define _this_cpu_generic_xchg(pcp, nval) \ |
| 411 | ({ typeof(pcp) ret__; \ | |
| 933393f5 | 412 | unsigned long flags; \ |
| e920d597 | 413 | raw_local_irq_save(flags); \ |
| 2b712442 CL |
414 | ret__ = __this_cpu_read(pcp); \ |
| 415 | __this_cpu_write(pcp, nval); \ | |
| e920d597 | 416 | raw_local_irq_restore(flags); \ |
| 2b712442 CL |
417 | ret__; \ |
| 418 | }) | |
| 419 | ||
| 420 | #ifndef this_cpu_xchg | |
| 421 | # ifndef this_cpu_xchg_1 | |
| 422 | # define this_cpu_xchg_1(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
| 423 | # endif | |
| 424 | # ifndef this_cpu_xchg_2 | |
| 425 | # define this_cpu_xchg_2(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
| 426 | # endif | |
| 427 | # ifndef this_cpu_xchg_4 | |
| 428 | # define this_cpu_xchg_4(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
| 429 | # endif | |
| 430 | # ifndef this_cpu_xchg_8 | |
| 431 | # define this_cpu_xchg_8(pcp, nval) _this_cpu_generic_xchg(pcp, nval) | |
| 432 | # endif | |
| 433 | # define this_cpu_xchg(pcp, nval) \ | |
| 434 | __pcpu_size_call_return2(this_cpu_xchg_, (pcp), nval) | |
| 435 | #endif | |
| 436 | ||
| 437 | #define _this_cpu_generic_cmpxchg(pcp, oval, nval) \ | |
| 933393f5 CL |
438 | ({ \ |
| 439 | typeof(pcp) ret__; \ | |
| 440 | unsigned long flags; \ | |
| e920d597 | 441 | raw_local_irq_save(flags); \ |
| 2b712442 CL |
442 | ret__ = __this_cpu_read(pcp); \ |
| 443 | if (ret__ == (oval)) \ | |
| 444 | __this_cpu_write(pcp, nval); \ | |
| e920d597 | 445 | raw_local_irq_restore(flags); \ |
| 2b712442 CL |
446 | ret__; \ |
| 447 | }) | |
| 448 | ||
| 449 | #ifndef this_cpu_cmpxchg | |
| 450 | # ifndef this_cpu_cmpxchg_1 | |
| 451 | # define this_cpu_cmpxchg_1(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 452 | # endif | |
| 453 | # ifndef this_cpu_cmpxchg_2 | |
| 454 | # define this_cpu_cmpxchg_2(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 455 | # endif | |
| 456 | # ifndef this_cpu_cmpxchg_4 | |
| 457 | # define this_cpu_cmpxchg_4(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 458 | # endif | |
| 459 | # ifndef this_cpu_cmpxchg_8 | |
| 460 | # define this_cpu_cmpxchg_8(pcp, oval, nval) _this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 461 | # endif | |
| 462 | # define this_cpu_cmpxchg(pcp, oval, nval) \ | |
| 463 | __pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval) | |
| 464 | #endif | |
| 465 | ||
| 7c334339 CL |
466 | /* |
| 467 | * cmpxchg_double replaces two adjacent scalars at once. The first | |
| 468 | * two parameters are per cpu variables which have to be of the same | |
| 469 | * size. A truth value is returned to indicate success or failure | |
| 470 | * (since a double register result is difficult to handle). There is | |
| 471 | * very limited hardware support for these operations, so only certain | |
| 472 | * sizes may work. | |
| 473 | */ | |
| 474 | #define _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 475 | ({ \ | |
| 476 | int ret__; \ | |
| 933393f5 | 477 | unsigned long flags; \ |
| e920d597 | 478 | raw_local_irq_save(flags); \ |
| 7c334339 CL |
479 | ret__ = __this_cpu_generic_cmpxchg_double(pcp1, pcp2, \ |
| 480 | oval1, oval2, nval1, nval2); \ | |
| e920d597 | 481 | raw_local_irq_restore(flags); \ |
| 7c334339 CL |
482 | ret__; \ |
| 483 | }) | |
| 484 | ||
| 485 | #ifndef this_cpu_cmpxchg_double | |
| 486 | # ifndef this_cpu_cmpxchg_double_1 | |
| 487 | # define this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 488 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 489 | # endif | |
| 490 | # ifndef this_cpu_cmpxchg_double_2 | |
| 491 | # define this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 492 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 493 | # endif | |
| 494 | # ifndef this_cpu_cmpxchg_double_4 | |
| 495 | # define this_cpu_cmpxchg_double_4(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_8 | |
| 499 | # define this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 500 | _this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 501 | # endif | |
| 502 | # define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 503 | __pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) | |
| 504 | #endif | |
| 505 | ||
| 7340a0b1 | 506 | /* |
| 933393f5 | 507 | * Generic percpu operations for context that are safe from preemption/interrupts. |
| 7340a0b1 | 508 | * Either we do not care about races or the caller has the |
| 933393f5 | 509 | * responsibility of handling preemption/interrupt issues. Arch code can still |
| 7340a0b1 CL |
510 | * override these instructions since the arch per cpu code may be more |
| 511 | * efficient and may actually get race freeness for free (that is the | |
| 512 | * case for x86 for example). | |
| 513 | * | |
| 514 | * If there is no other protection through preempt disable and/or | |
| 515 | * disabling interupts then one of these RMW operations can show unexpected | |
| 516 | * behavior because the execution thread was rescheduled on another processor | |
| 517 | * or an interrupt occurred and the same percpu variable was modified from | |
| 518 | * the interrupt context. | |
| 519 | */ | |
| 520 | #ifndef __this_cpu_read | |
| 521 | # ifndef __this_cpu_read_1 | |
| 522 | # define __this_cpu_read_1(pcp) (*__this_cpu_ptr(&(pcp))) | |
| 523 | # endif | |
| 524 | # ifndef __this_cpu_read_2 | |
| 525 | # define __this_cpu_read_2(pcp) (*__this_cpu_ptr(&(pcp))) | |
| 526 | # endif | |
| 527 | # ifndef __this_cpu_read_4 | |
| 528 | # define __this_cpu_read_4(pcp) (*__this_cpu_ptr(&(pcp))) | |
| 529 | # endif | |
| 530 | # ifndef __this_cpu_read_8 | |
| 531 | # define __this_cpu_read_8(pcp) (*__this_cpu_ptr(&(pcp))) | |
| 532 | # endif | |
| 0f5e4816 | 533 | # define __this_cpu_read(pcp) __pcpu_size_call_return(__this_cpu_read_, (pcp)) |
| 7340a0b1 CL |
534 | #endif |
| 535 | ||
| 536 | #define __this_cpu_generic_to_op(pcp, val, op) \ | |
| 537 | do { \ | |
| 538 | *__this_cpu_ptr(&(pcp)) op val; \ | |
| 539 | } while (0) | |
| 540 | ||
| 541 | #ifndef __this_cpu_write | |
| 542 | # ifndef __this_cpu_write_1 | |
| 543 | # define __this_cpu_write_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
| 544 | # endif | |
| 545 | # ifndef __this_cpu_write_2 | |
| 546 | # define __this_cpu_write_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
| 547 | # endif | |
| 548 | # ifndef __this_cpu_write_4 | |
| 549 | # define __this_cpu_write_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
| 550 | # endif | |
| 551 | # ifndef __this_cpu_write_8 | |
| 552 | # define __this_cpu_write_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), =) | |
| 553 | # endif | |
| 0f5e4816 | 554 | # define __this_cpu_write(pcp, val) __pcpu_size_call(__this_cpu_write_, (pcp), (val)) |
| 7340a0b1 CL |
555 | #endif |
| 556 | ||
| 557 | #ifndef __this_cpu_add | |
| 558 | # ifndef __this_cpu_add_1 | |
| 559 | # define __this_cpu_add_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
| 560 | # endif | |
| 561 | # ifndef __this_cpu_add_2 | |
| 562 | # define __this_cpu_add_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
| 563 | # endif | |
| 564 | # ifndef __this_cpu_add_4 | |
| 565 | # define __this_cpu_add_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
| 566 | # endif | |
| 567 | # ifndef __this_cpu_add_8 | |
| 568 | # define __this_cpu_add_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), +=) | |
| 569 | # endif | |
| 0f5e4816 | 570 | # define __this_cpu_add(pcp, val) __pcpu_size_call(__this_cpu_add_, (pcp), (val)) |
| 7340a0b1 CL |
571 | #endif |
| 572 | ||
| 573 | #ifndef __this_cpu_sub | |
| bd09d9a3 | 574 | # define __this_cpu_sub(pcp, val) __this_cpu_add((pcp), -(typeof(pcp))(val)) |
| 7340a0b1 CL |
575 | #endif |
| 576 | ||
| 577 | #ifndef __this_cpu_inc | |
| 578 | # define __this_cpu_inc(pcp) __this_cpu_add((pcp), 1) | |
| 579 | #endif | |
| 580 | ||
| 581 | #ifndef __this_cpu_dec | |
| 582 | # define __this_cpu_dec(pcp) __this_cpu_sub((pcp), 1) | |
| 583 | #endif | |
| 584 | ||
| 585 | #ifndef __this_cpu_and | |
| 586 | # ifndef __this_cpu_and_1 | |
| 587 | # define __this_cpu_and_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
| 588 | # endif | |
| 589 | # ifndef __this_cpu_and_2 | |
| 590 | # define __this_cpu_and_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
| 591 | # endif | |
| 592 | # ifndef __this_cpu_and_4 | |
| 593 | # define __this_cpu_and_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
| 594 | # endif | |
| 595 | # ifndef __this_cpu_and_8 | |
| 596 | # define __this_cpu_and_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), &=) | |
| 597 | # endif | |
| 0f5e4816 | 598 | # define __this_cpu_and(pcp, val) __pcpu_size_call(__this_cpu_and_, (pcp), (val)) |
| 7340a0b1 CL |
599 | #endif |
| 600 | ||
| 601 | #ifndef __this_cpu_or | |
| 602 | # ifndef __this_cpu_or_1 | |
| 603 | # define __this_cpu_or_1(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
| 604 | # endif | |
| 605 | # ifndef __this_cpu_or_2 | |
| 606 | # define __this_cpu_or_2(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
| 607 | # endif | |
| 608 | # ifndef __this_cpu_or_4 | |
| 609 | # define __this_cpu_or_4(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
| 610 | # endif | |
| 611 | # ifndef __this_cpu_or_8 | |
| 612 | # define __this_cpu_or_8(pcp, val) __this_cpu_generic_to_op((pcp), (val), |=) | |
| 613 | # endif | |
| 0f5e4816 | 614 | # define __this_cpu_or(pcp, val) __pcpu_size_call(__this_cpu_or_, (pcp), (val)) |
| 7340a0b1 CL |
615 | #endif |
| 616 | ||
| a663ffff CL |
617 | #define __this_cpu_generic_add_return(pcp, val) \ |
| 618 | ({ \ | |
| 619 | __this_cpu_add(pcp, val); \ | |
| 620 | __this_cpu_read(pcp); \ | |
| 621 | }) | |
| 622 | ||
| 623 | #ifndef __this_cpu_add_return | |
| 624 | # ifndef __this_cpu_add_return_1 | |
| 625 | # define __this_cpu_add_return_1(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
| 626 | # endif | |
| 627 | # ifndef __this_cpu_add_return_2 | |
| 628 | # define __this_cpu_add_return_2(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
| 629 | # endif | |
| 630 | # ifndef __this_cpu_add_return_4 | |
| 631 | # define __this_cpu_add_return_4(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
| 632 | # endif | |
| 633 | # ifndef __this_cpu_add_return_8 | |
| 634 | # define __this_cpu_add_return_8(pcp, val) __this_cpu_generic_add_return(pcp, val) | |
| 635 | # endif | |
| 7d96b3e5 KK |
636 | # define __this_cpu_add_return(pcp, val) \ |
| 637 | __pcpu_size_call_return2(__this_cpu_add_return_, pcp, val) | |
| a663ffff CL |
638 | #endif |
| 639 | ||
| bd09d9a3 | 640 | #define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val)) |
| adb79506 KK |
641 | #define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1) |
| 642 | #define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1) | |
| a663ffff | 643 | |
| 2b712442 CL |
644 | #define __this_cpu_generic_xchg(pcp, nval) \ |
| 645 | ({ typeof(pcp) ret__; \ | |
| 646 | ret__ = __this_cpu_read(pcp); \ | |
| 647 | __this_cpu_write(pcp, nval); \ | |
| 648 | ret__; \ | |
| 649 | }) | |
| 650 | ||
| 651 | #ifndef __this_cpu_xchg | |
| 652 | # ifndef __this_cpu_xchg_1 | |
| 653 | # define __this_cpu_xchg_1(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
| 654 | # endif | |
| 655 | # ifndef __this_cpu_xchg_2 | |
| 656 | # define __this_cpu_xchg_2(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
| 657 | # endif | |
| 658 | # ifndef __this_cpu_xchg_4 | |
| 659 | # define __this_cpu_xchg_4(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
| 660 | # endif | |
| 661 | # ifndef __this_cpu_xchg_8 | |
| 662 | # define __this_cpu_xchg_8(pcp, nval) __this_cpu_generic_xchg(pcp, nval) | |
| 663 | # endif | |
| 664 | # define __this_cpu_xchg(pcp, nval) \ | |
| 665 | __pcpu_size_call_return2(__this_cpu_xchg_, (pcp), nval) | |
| 666 | #endif | |
| 667 | ||
| 668 | #define __this_cpu_generic_cmpxchg(pcp, oval, nval) \ | |
| 669 | ({ \ | |
| 670 | typeof(pcp) ret__; \ | |
| 671 | ret__ = __this_cpu_read(pcp); \ | |
| 672 | if (ret__ == (oval)) \ | |
| 673 | __this_cpu_write(pcp, nval); \ | |
| 674 | ret__; \ | |
| 675 | }) | |
| 676 | ||
| 677 | #ifndef __this_cpu_cmpxchg | |
| 678 | # ifndef __this_cpu_cmpxchg_1 | |
| 679 | # define __this_cpu_cmpxchg_1(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 680 | # endif | |
| 681 | # ifndef __this_cpu_cmpxchg_2 | |
| 682 | # define __this_cpu_cmpxchg_2(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 683 | # endif | |
| 684 | # ifndef __this_cpu_cmpxchg_4 | |
| 685 | # define __this_cpu_cmpxchg_4(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 686 | # endif | |
| 687 | # ifndef __this_cpu_cmpxchg_8 | |
| 688 | # define __this_cpu_cmpxchg_8(pcp, oval, nval) __this_cpu_generic_cmpxchg(pcp, oval, nval) | |
| 689 | # endif | |
| 690 | # define __this_cpu_cmpxchg(pcp, oval, nval) \ | |
| 691 | __pcpu_size_call_return2(__this_cpu_cmpxchg_, pcp, oval, nval) | |
| 692 | #endif | |
| 693 | ||
| 7c334339 CL |
694 | #define __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ |
| 695 | ({ \ | |
| 696 | int __ret = 0; \ | |
| 697 | if (__this_cpu_read(pcp1) == (oval1) && \ | |
| 698 | __this_cpu_read(pcp2) == (oval2)) { \ | |
| 699 | __this_cpu_write(pcp1, (nval1)); \ | |
| 700 | __this_cpu_write(pcp2, (nval2)); \ | |
| 701 | __ret = 1; \ | |
| 702 | } \ | |
| 703 | (__ret); \ | |
| 704 | }) | |
| 705 | ||
| 706 | #ifndef __this_cpu_cmpxchg_double | |
| 707 | # ifndef __this_cpu_cmpxchg_double_1 | |
| 708 | # define __this_cpu_cmpxchg_double_1(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 709 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 710 | # endif | |
| 711 | # ifndef __this_cpu_cmpxchg_double_2 | |
| 712 | # define __this_cpu_cmpxchg_double_2(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 713 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 714 | # endif | |
| 715 | # ifndef __this_cpu_cmpxchg_double_4 | |
| 716 | # define __this_cpu_cmpxchg_double_4(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 717 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 718 | # endif | |
| 719 | # ifndef __this_cpu_cmpxchg_double_8 | |
| 720 | # define __this_cpu_cmpxchg_double_8(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 721 | __this_cpu_generic_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) | |
| 722 | # endif | |
| 723 | # define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \ | |
| 724 | __pcpu_double_call_return_bool(__this_cpu_cmpxchg_double_, (pcp1), (pcp2), (oval1), (oval2), (nval1), (nval2)) | |
| 725 | #endif | |
| 726 | ||
| 1da177e4 | 727 | #endif /* __LINUX_PERCPU_H */ |