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Commit | Line | Data |
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1da177e4 LT |
1 | /* CPU control. |
2 | * (C) 2001, 2002, 2003, 2004 Rusty Russell | |
3 | * | |
4 | * This code is licenced under the GPL. | |
5 | */ | |
6 | #include <linux/proc_fs.h> | |
7 | #include <linux/smp.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/notifier.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/unistd.h> | |
12 | #include <linux/cpu.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/kthread.h> | |
15 | #include <linux/stop_machine.h> | |
81615b62 | 16 | #include <linux/mutex.h> |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
1da177e4 | 18 | |
98a79d6a | 19 | #ifdef CONFIG_SMP |
b3199c02 | 20 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
aa953877 | 21 | static DEFINE_MUTEX(cpu_add_remove_lock); |
1da177e4 | 22 | |
bd5349cf | 23 | static __cpuinitdata RAW_NOTIFIER_HEAD(cpu_chain); |
1da177e4 | 24 | |
e3920fb4 RW |
25 | /* If set, cpu_up and cpu_down will return -EBUSY and do nothing. |
26 | * Should always be manipulated under cpu_add_remove_lock | |
27 | */ | |
28 | static int cpu_hotplug_disabled; | |
29 | ||
d221938c GS |
30 | static struct { |
31 | struct task_struct *active_writer; | |
32 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
33 | /* | |
34 | * Also blocks the new readers during | |
35 | * an ongoing cpu hotplug operation. | |
36 | */ | |
37 | int refcount; | |
31950eb6 LT |
38 | } cpu_hotplug = { |
39 | .active_writer = NULL, | |
40 | .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), | |
41 | .refcount = 0, | |
42 | }; | |
d221938c GS |
43 | |
44 | #ifdef CONFIG_HOTPLUG_CPU | |
90d45d17 | 45 | |
86ef5c9a | 46 | void get_online_cpus(void) |
a9d9baa1 | 47 | { |
d221938c GS |
48 | might_sleep(); |
49 | if (cpu_hotplug.active_writer == current) | |
aa953877 | 50 | return; |
d221938c GS |
51 | mutex_lock(&cpu_hotplug.lock); |
52 | cpu_hotplug.refcount++; | |
53 | mutex_unlock(&cpu_hotplug.lock); | |
54 | ||
a9d9baa1 | 55 | } |
86ef5c9a | 56 | EXPORT_SYMBOL_GPL(get_online_cpus); |
90d45d17 | 57 | |
86ef5c9a | 58 | void put_online_cpus(void) |
a9d9baa1 | 59 | { |
d221938c | 60 | if (cpu_hotplug.active_writer == current) |
aa953877 | 61 | return; |
d221938c | 62 | mutex_lock(&cpu_hotplug.lock); |
d2ba7e2a ON |
63 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) |
64 | wake_up_process(cpu_hotplug.active_writer); | |
d221938c GS |
65 | mutex_unlock(&cpu_hotplug.lock); |
66 | ||
a9d9baa1 | 67 | } |
86ef5c9a | 68 | EXPORT_SYMBOL_GPL(put_online_cpus); |
a9d9baa1 | 69 | |
a9d9baa1 | 70 | #endif /* CONFIG_HOTPLUG_CPU */ |
90d45d17 | 71 | |
d221938c GS |
72 | /* |
73 | * The following two API's must be used when attempting | |
b3199c02 | 74 | * to serialize the updates to cpu_online_mask, cpu_present_mask. |
d221938c GS |
75 | */ |
76 | void cpu_maps_update_begin(void) | |
77 | { | |
78 | mutex_lock(&cpu_add_remove_lock); | |
79 | } | |
80 | ||
81 | void cpu_maps_update_done(void) | |
82 | { | |
83 | mutex_unlock(&cpu_add_remove_lock); | |
84 | } | |
85 | ||
86 | /* | |
87 | * This ensures that the hotplug operation can begin only when the | |
88 | * refcount goes to zero. | |
89 | * | |
90 | * Note that during a cpu-hotplug operation, the new readers, if any, | |
91 | * will be blocked by the cpu_hotplug.lock | |
92 | * | |
d2ba7e2a ON |
93 | * Since cpu_hotplug_begin() is always called after invoking |
94 | * cpu_maps_update_begin(), we can be sure that only one writer is active. | |
d221938c GS |
95 | * |
96 | * Note that theoretically, there is a possibility of a livelock: | |
97 | * - Refcount goes to zero, last reader wakes up the sleeping | |
98 | * writer. | |
99 | * - Last reader unlocks the cpu_hotplug.lock. | |
100 | * - A new reader arrives at this moment, bumps up the refcount. | |
101 | * - The writer acquires the cpu_hotplug.lock finds the refcount | |
102 | * non zero and goes to sleep again. | |
103 | * | |
104 | * However, this is very difficult to achieve in practice since | |
86ef5c9a | 105 | * get_online_cpus() not an api which is called all that often. |
d221938c GS |
106 | * |
107 | */ | |
108 | static void cpu_hotplug_begin(void) | |
109 | { | |
d221938c | 110 | cpu_hotplug.active_writer = current; |
d2ba7e2a ON |
111 | |
112 | for (;;) { | |
113 | mutex_lock(&cpu_hotplug.lock); | |
114 | if (likely(!cpu_hotplug.refcount)) | |
115 | break; | |
116 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
d221938c GS |
117 | mutex_unlock(&cpu_hotplug.lock); |
118 | schedule(); | |
d221938c | 119 | } |
d221938c GS |
120 | } |
121 | ||
122 | static void cpu_hotplug_done(void) | |
123 | { | |
124 | cpu_hotplug.active_writer = NULL; | |
125 | mutex_unlock(&cpu_hotplug.lock); | |
126 | } | |
1da177e4 | 127 | /* Need to know about CPUs going up/down? */ |
f7b16c10 | 128 | int __ref register_cpu_notifier(struct notifier_block *nb) |
1da177e4 | 129 | { |
bd5349cf | 130 | int ret; |
d221938c | 131 | cpu_maps_update_begin(); |
bd5349cf | 132 | ret = raw_notifier_chain_register(&cpu_chain, nb); |
d221938c | 133 | cpu_maps_update_done(); |
bd5349cf | 134 | return ret; |
1da177e4 | 135 | } |
65edc68c CS |
136 | |
137 | #ifdef CONFIG_HOTPLUG_CPU | |
138 | ||
1da177e4 LT |
139 | EXPORT_SYMBOL(register_cpu_notifier); |
140 | ||
9647155f | 141 | void __ref unregister_cpu_notifier(struct notifier_block *nb) |
1da177e4 | 142 | { |
d221938c | 143 | cpu_maps_update_begin(); |
bd5349cf | 144 | raw_notifier_chain_unregister(&cpu_chain, nb); |
d221938c | 145 | cpu_maps_update_done(); |
1da177e4 LT |
146 | } |
147 | EXPORT_SYMBOL(unregister_cpu_notifier); | |
148 | ||
1da177e4 LT |
149 | static inline void check_for_tasks(int cpu) |
150 | { | |
151 | struct task_struct *p; | |
152 | ||
153 | write_lock_irq(&tasklist_lock); | |
154 | for_each_process(p) { | |
11854247 | 155 | if (task_cpu(p) == cpu && p->state == TASK_RUNNING && |
1da177e4 LT |
156 | (!cputime_eq(p->utime, cputime_zero) || |
157 | !cputime_eq(p->stime, cputime_zero))) | |
9d3cfc4c FP |
158 | printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d " |
159 | "(state = %ld, flags = %x)\n", | |
160 | p->comm, task_pid_nr(p), cpu, | |
161 | p->state, p->flags); | |
1da177e4 LT |
162 | } |
163 | write_unlock_irq(&tasklist_lock); | |
164 | } | |
165 | ||
db912f96 AK |
166 | struct take_cpu_down_param { |
167 | unsigned long mod; | |
168 | void *hcpu; | |
169 | }; | |
170 | ||
1da177e4 | 171 | /* Take this CPU down. */ |
514a20a5 | 172 | static int __ref take_cpu_down(void *_param) |
1da177e4 | 173 | { |
db912f96 | 174 | struct take_cpu_down_param *param = _param; |
1da177e4 LT |
175 | int err; |
176 | ||
1da177e4 LT |
177 | /* Ensure this CPU doesn't handle any more interrupts. */ |
178 | err = __cpu_disable(); | |
179 | if (err < 0) | |
f3705136 | 180 | return err; |
1da177e4 | 181 | |
3ba35573 MS |
182 | raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod, |
183 | param->hcpu); | |
184 | ||
f3705136 ZM |
185 | /* Force idle task to run as soon as we yield: it should |
186 | immediately notice cpu is offline and die quickly. */ | |
187 | sched_idle_next(); | |
188 | return 0; | |
1da177e4 LT |
189 | } |
190 | ||
e3920fb4 | 191 | /* Requires cpu_add_remove_lock to be held */ |
514a20a5 | 192 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) |
1da177e4 | 193 | { |
e7407dcc | 194 | int err, nr_calls = 0; |
e0b582ec | 195 | cpumask_var_t old_allowed; |
e7407dcc | 196 | void *hcpu = (void *)(long)cpu; |
8bb78442 | 197 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
db912f96 AK |
198 | struct take_cpu_down_param tcd_param = { |
199 | .mod = mod, | |
200 | .hcpu = hcpu, | |
201 | }; | |
1da177e4 | 202 | |
e3920fb4 RW |
203 | if (num_online_cpus() == 1) |
204 | return -EBUSY; | |
1da177e4 | 205 | |
e3920fb4 RW |
206 | if (!cpu_online(cpu)) |
207 | return -EINVAL; | |
1da177e4 | 208 | |
e0b582ec RR |
209 | if (!alloc_cpumask_var(&old_allowed, GFP_KERNEL)) |
210 | return -ENOMEM; | |
211 | ||
d221938c | 212 | cpu_hotplug_begin(); |
9ee349ad | 213 | set_cpu_active(cpu, false); |
8bb78442 | 214 | err = __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_PREPARE | mod, |
e7407dcc | 215 | hcpu, -1, &nr_calls); |
1da177e4 | 216 | if (err == NOTIFY_BAD) { |
6ad4c188 PZ |
217 | set_cpu_active(cpu, true); |
218 | ||
a0d8cdb6 | 219 | nr_calls--; |
8bb78442 RW |
220 | __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
221 | hcpu, nr_calls, NULL); | |
1da177e4 | 222 | printk("%s: attempt to take down CPU %u failed\n", |
af1f16d0 | 223 | __func__, cpu); |
baaca49f GS |
224 | err = -EINVAL; |
225 | goto out_release; | |
1da177e4 LT |
226 | } |
227 | ||
228 | /* Ensure that we are not runnable on dying cpu */ | |
e0b582ec | 229 | cpumask_copy(old_allowed, ¤t->cpus_allowed); |
6ad4c188 | 230 | set_cpus_allowed_ptr(current, cpu_active_mask); |
1da177e4 | 231 | |
e0b582ec | 232 | err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); |
04321587 | 233 | if (err) { |
6ad4c188 | 234 | set_cpu_active(cpu, true); |
1da177e4 | 235 | /* CPU didn't die: tell everyone. Can't complain. */ |
8bb78442 | 236 | if (raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, |
e7407dcc | 237 | hcpu) == NOTIFY_BAD) |
1da177e4 LT |
238 | BUG(); |
239 | ||
ffdb5976 | 240 | goto out_allowed; |
8fa1d7d3 | 241 | } |
04321587 | 242 | BUG_ON(cpu_online(cpu)); |
1da177e4 LT |
243 | |
244 | /* Wait for it to sleep (leaving idle task). */ | |
245 | while (!idle_cpu(cpu)) | |
246 | yield(); | |
247 | ||
248 | /* This actually kills the CPU. */ | |
249 | __cpu_die(cpu); | |
250 | ||
1da177e4 | 251 | /* CPU is completely dead: tell everyone. Too late to complain. */ |
8bb78442 RW |
252 | if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | mod, |
253 | hcpu) == NOTIFY_BAD) | |
1da177e4 LT |
254 | BUG(); |
255 | ||
256 | check_for_tasks(cpu); | |
257 | ||
1da177e4 | 258 | out_allowed: |
e0b582ec | 259 | set_cpus_allowed_ptr(current, old_allowed); |
baaca49f | 260 | out_release: |
d221938c | 261 | cpu_hotplug_done(); |
3da1c84c ON |
262 | if (!err) { |
263 | if (raw_notifier_call_chain(&cpu_chain, CPU_POST_DEAD | mod, | |
264 | hcpu) == NOTIFY_BAD) | |
265 | BUG(); | |
266 | } | |
e0b582ec | 267 | free_cpumask_var(old_allowed); |
e3920fb4 RW |
268 | return err; |
269 | } | |
270 | ||
514a20a5 | 271 | int __ref cpu_down(unsigned int cpu) |
e3920fb4 | 272 | { |
9ea09af3 | 273 | int err; |
e3920fb4 | 274 | |
9ea09af3 HC |
275 | err = stop_machine_create(); |
276 | if (err) | |
277 | return err; | |
d221938c | 278 | cpu_maps_update_begin(); |
e761b772 MK |
279 | |
280 | if (cpu_hotplug_disabled) { | |
e3920fb4 | 281 | err = -EBUSY; |
e761b772 MK |
282 | goto out; |
283 | } | |
284 | ||
e761b772 | 285 | err = _cpu_down(cpu, 0); |
e3920fb4 | 286 | |
e761b772 | 287 | out: |
d221938c | 288 | cpu_maps_update_done(); |
9ea09af3 | 289 | stop_machine_destroy(); |
1da177e4 LT |
290 | return err; |
291 | } | |
b62b8ef9 | 292 | EXPORT_SYMBOL(cpu_down); |
1da177e4 LT |
293 | #endif /*CONFIG_HOTPLUG_CPU*/ |
294 | ||
e3920fb4 | 295 | /* Requires cpu_add_remove_lock to be held */ |
8bb78442 | 296 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) |
1da177e4 | 297 | { |
baaca49f | 298 | int ret, nr_calls = 0; |
1da177e4 | 299 | void *hcpu = (void *)(long)cpu; |
8bb78442 | 300 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
1da177e4 | 301 | |
e3920fb4 RW |
302 | if (cpu_online(cpu) || !cpu_present(cpu)) |
303 | return -EINVAL; | |
90d45d17 | 304 | |
d221938c | 305 | cpu_hotplug_begin(); |
8bb78442 | 306 | ret = __raw_notifier_call_chain(&cpu_chain, CPU_UP_PREPARE | mod, hcpu, |
baaca49f | 307 | -1, &nr_calls); |
1da177e4 | 308 | if (ret == NOTIFY_BAD) { |
a0d8cdb6 | 309 | nr_calls--; |
1da177e4 | 310 | printk("%s: attempt to bring up CPU %u failed\n", |
af1f16d0 | 311 | __func__, cpu); |
1da177e4 LT |
312 | ret = -EINVAL; |
313 | goto out_notify; | |
314 | } | |
315 | ||
316 | /* Arch-specific enabling code. */ | |
317 | ret = __cpu_up(cpu); | |
318 | if (ret != 0) | |
319 | goto out_notify; | |
6978c705 | 320 | BUG_ON(!cpu_online(cpu)); |
1da177e4 | 321 | |
2b17fa50 | 322 | set_cpu_active(cpu, true); |
279ef6bb | 323 | |
1da177e4 | 324 | /* Now call notifier in preparation. */ |
8bb78442 | 325 | raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu); |
1da177e4 LT |
326 | |
327 | out_notify: | |
328 | if (ret != 0) | |
baaca49f | 329 | __raw_notifier_call_chain(&cpu_chain, |
8bb78442 | 330 | CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); |
d221938c | 331 | cpu_hotplug_done(); |
e3920fb4 RW |
332 | |
333 | return ret; | |
334 | } | |
335 | ||
b282b6f8 | 336 | int __cpuinit cpu_up(unsigned int cpu) |
e3920fb4 RW |
337 | { |
338 | int err = 0; | |
e0b582ec | 339 | if (!cpu_possible(cpu)) { |
73e753a5 KH |
340 | printk(KERN_ERR "can't online cpu %d because it is not " |
341 | "configured as may-hotadd at boot time\n", cpu); | |
87d5e023 | 342 | #if defined(CONFIG_IA64) |
73e753a5 KH |
343 | printk(KERN_ERR "please check additional_cpus= boot " |
344 | "parameter\n"); | |
345 | #endif | |
346 | return -EINVAL; | |
347 | } | |
e3920fb4 | 348 | |
d221938c | 349 | cpu_maps_update_begin(); |
e761b772 MK |
350 | |
351 | if (cpu_hotplug_disabled) { | |
e3920fb4 | 352 | err = -EBUSY; |
e761b772 MK |
353 | goto out; |
354 | } | |
355 | ||
356 | err = _cpu_up(cpu, 0); | |
357 | ||
e761b772 | 358 | out: |
d221938c | 359 | cpu_maps_update_done(); |
e3920fb4 RW |
360 | return err; |
361 | } | |
362 | ||
f3de4be9 | 363 | #ifdef CONFIG_PM_SLEEP_SMP |
e0b582ec | 364 | static cpumask_var_t frozen_cpus; |
e3920fb4 RW |
365 | |
366 | int disable_nonboot_cpus(void) | |
367 | { | |
69575d38 | 368 | int cpu, first_cpu, error; |
e3920fb4 | 369 | |
a0e280e0 HC |
370 | error = stop_machine_create(); |
371 | if (error) | |
372 | return error; | |
d221938c | 373 | cpu_maps_update_begin(); |
e0b582ec | 374 | first_cpu = cpumask_first(cpu_online_mask); |
9ee349ad XF |
375 | /* |
376 | * We take down all of the non-boot CPUs in one shot to avoid races | |
e3920fb4 RW |
377 | * with the userspace trying to use the CPU hotplug at the same time |
378 | */ | |
e0b582ec | 379 | cpumask_clear(frozen_cpus); |
6ad4c188 | 380 | |
e3920fb4 RW |
381 | printk("Disabling non-boot CPUs ...\n"); |
382 | for_each_online_cpu(cpu) { | |
383 | if (cpu == first_cpu) | |
384 | continue; | |
8bb78442 | 385 | error = _cpu_down(cpu, 1); |
feae3203 | 386 | if (!error) |
e0b582ec | 387 | cpumask_set_cpu(cpu, frozen_cpus); |
feae3203 | 388 | else { |
e3920fb4 RW |
389 | printk(KERN_ERR "Error taking CPU%d down: %d\n", |
390 | cpu, error); | |
391 | break; | |
392 | } | |
393 | } | |
86886e55 | 394 | |
e3920fb4 RW |
395 | if (!error) { |
396 | BUG_ON(num_online_cpus() > 1); | |
397 | /* Make sure the CPUs won't be enabled by someone else */ | |
398 | cpu_hotplug_disabled = 1; | |
399 | } else { | |
e1d9fd2e | 400 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); |
e3920fb4 | 401 | } |
d221938c | 402 | cpu_maps_update_done(); |
a0e280e0 | 403 | stop_machine_destroy(); |
e3920fb4 RW |
404 | return error; |
405 | } | |
406 | ||
d0af9eed SS |
407 | void __weak arch_enable_nonboot_cpus_begin(void) |
408 | { | |
409 | } | |
410 | ||
411 | void __weak arch_enable_nonboot_cpus_end(void) | |
412 | { | |
413 | } | |
414 | ||
fa7303e2 | 415 | void __ref enable_nonboot_cpus(void) |
e3920fb4 RW |
416 | { |
417 | int cpu, error; | |
418 | ||
419 | /* Allow everyone to use the CPU hotplug again */ | |
d221938c | 420 | cpu_maps_update_begin(); |
e3920fb4 | 421 | cpu_hotplug_disabled = 0; |
e0b582ec | 422 | if (cpumask_empty(frozen_cpus)) |
1d64b9cb | 423 | goto out; |
e3920fb4 RW |
424 | |
425 | printk("Enabling non-boot CPUs ...\n"); | |
d0af9eed SS |
426 | |
427 | arch_enable_nonboot_cpus_begin(); | |
428 | ||
e0b582ec | 429 | for_each_cpu(cpu, frozen_cpus) { |
8bb78442 | 430 | error = _cpu_up(cpu, 1); |
e3920fb4 RW |
431 | if (!error) { |
432 | printk("CPU%d is up\n", cpu); | |
433 | continue; | |
434 | } | |
1d64b9cb | 435 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); |
e3920fb4 | 436 | } |
d0af9eed SS |
437 | |
438 | arch_enable_nonboot_cpus_end(); | |
439 | ||
e0b582ec | 440 | cpumask_clear(frozen_cpus); |
1d64b9cb | 441 | out: |
d221938c | 442 | cpu_maps_update_done(); |
1da177e4 | 443 | } |
e0b582ec RR |
444 | |
445 | static int alloc_frozen_cpus(void) | |
446 | { | |
447 | if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) | |
448 | return -ENOMEM; | |
449 | return 0; | |
450 | } | |
451 | core_initcall(alloc_frozen_cpus); | |
f3de4be9 | 452 | #endif /* CONFIG_PM_SLEEP_SMP */ |
68f4f1ec | 453 | |
e545a614 MS |
454 | /** |
455 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers | |
456 | * @cpu: cpu that just started | |
457 | * | |
458 | * This function calls the cpu_chain notifiers with CPU_STARTING. | |
459 | * It must be called by the arch code on the new cpu, before the new cpu | |
460 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). | |
461 | */ | |
84196414 | 462 | void __cpuinit notify_cpu_starting(unsigned int cpu) |
e545a614 MS |
463 | { |
464 | unsigned long val = CPU_STARTING; | |
465 | ||
466 | #ifdef CONFIG_PM_SLEEP_SMP | |
e0b582ec | 467 | if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) |
e545a614 MS |
468 | val = CPU_STARTING_FROZEN; |
469 | #endif /* CONFIG_PM_SLEEP_SMP */ | |
470 | raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu); | |
471 | } | |
472 | ||
68f4f1ec | 473 | #endif /* CONFIG_SMP */ |
b8d317d1 | 474 | |
e56b3bc7 LT |
475 | /* |
476 | * cpu_bit_bitmap[] is a special, "compressed" data structure that | |
477 | * represents all NR_CPUS bits binary values of 1<<nr. | |
478 | * | |
e0b582ec | 479 | * It is used by cpumask_of() to get a constant address to a CPU |
e56b3bc7 LT |
480 | * mask value that has a single bit set only. |
481 | */ | |
b8d317d1 | 482 | |
e56b3bc7 LT |
483 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ |
484 | #define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x) | |
485 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) | |
486 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) | |
487 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) | |
b8d317d1 | 488 | |
e56b3bc7 LT |
489 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { |
490 | ||
491 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), | |
492 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), | |
493 | #if BITS_PER_LONG > 32 | |
494 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), | |
495 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), | |
b8d317d1 MT |
496 | #endif |
497 | }; | |
e56b3bc7 | 498 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
2d3854a3 RR |
499 | |
500 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; | |
501 | EXPORT_SYMBOL(cpu_all_bits); | |
b3199c02 RR |
502 | |
503 | #ifdef CONFIG_INIT_ALL_POSSIBLE | |
504 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly | |
505 | = CPU_BITS_ALL; | |
506 | #else | |
507 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; | |
508 | #endif | |
509 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); | |
510 | EXPORT_SYMBOL(cpu_possible_mask); | |
511 | ||
512 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; | |
513 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); | |
514 | EXPORT_SYMBOL(cpu_online_mask); | |
515 | ||
516 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; | |
517 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); | |
518 | EXPORT_SYMBOL(cpu_present_mask); | |
519 | ||
520 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; | |
521 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); | |
522 | EXPORT_SYMBOL(cpu_active_mask); | |
3fa41520 RR |
523 | |
524 | void set_cpu_possible(unsigned int cpu, bool possible) | |
525 | { | |
526 | if (possible) | |
527 | cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); | |
528 | else | |
529 | cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); | |
530 | } | |
531 | ||
532 | void set_cpu_present(unsigned int cpu, bool present) | |
533 | { | |
534 | if (present) | |
535 | cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); | |
536 | else | |
537 | cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); | |
538 | } | |
539 | ||
540 | void set_cpu_online(unsigned int cpu, bool online) | |
541 | { | |
542 | if (online) | |
543 | cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); | |
544 | else | |
545 | cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); | |
546 | } | |
547 | ||
548 | void set_cpu_active(unsigned int cpu, bool active) | |
549 | { | |
550 | if (active) | |
551 | cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); | |
552 | else | |
553 | cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); | |
554 | } | |
555 | ||
556 | void init_cpu_present(const struct cpumask *src) | |
557 | { | |
558 | cpumask_copy(to_cpumask(cpu_present_bits), src); | |
559 | } | |
560 | ||
561 | void init_cpu_possible(const struct cpumask *src) | |
562 | { | |
563 | cpumask_copy(to_cpumask(cpu_possible_bits), src); | |
564 | } | |
565 | ||
566 | void init_cpu_online(const struct cpumask *src) | |
567 | { | |
568 | cpumask_copy(to_cpumask(cpu_online_bits), src); | |
569 | } |