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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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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> |
16 | #include <linux/mutex.h> |
17 | #include <linux/gfp.h> |
18 | |
19 | #ifdef CONFIG_SMP |
20 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
21 | static DEFINE_MUTEX(cpu_add_remove_lock); |
22 | |
23 | /* |
24 | * The following two API's must be used when attempting |
25 | * to serialize the updates to cpu_online_mask, cpu_present_mask. |
26 | */ |
27 | void cpu_maps_update_begin(void) |
28 | { |
29 | mutex_lock(&cpu_add_remove_lock); |
30 | } |
31 | |
32 | void cpu_maps_update_done(void) |
33 | { |
34 | mutex_unlock(&cpu_add_remove_lock); |
35 | } |
36 | |
37 | static RAW_NOTIFIER_HEAD(cpu_chain); |
38 | |
39 | /* If set, cpu_up and cpu_down will return -EBUSY and do nothing. |
40 | * Should always be manipulated under cpu_add_remove_lock |
41 | */ |
42 | static int cpu_hotplug_disabled; |
43 | |
44 | #ifdef CONFIG_HOTPLUG_CPU |
45 | |
46 | static struct { |
47 | struct task_struct *active_writer; |
48 | struct mutex lock; /* Synchronizes accesses to refcount, */ |
49 | /* |
50 | * Also blocks the new readers during |
51 | * an ongoing cpu hotplug operation. |
52 | */ |
53 | int refcount; |
54 | } cpu_hotplug = { |
55 | .active_writer = NULL, |
56 | .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), |
57 | .refcount = 0, |
58 | }; |
59 | |
60 | void get_online_cpus(void) |
61 | { |
62 | might_sleep(); |
63 | if (cpu_hotplug.active_writer == current) |
64 | return; |
65 | mutex_lock(&cpu_hotplug.lock); |
66 | cpu_hotplug.refcount++; |
67 | mutex_unlock(&cpu_hotplug.lock); |
68 | |
69 | } |
70 | EXPORT_SYMBOL_GPL(get_online_cpus); |
71 | |
72 | void put_online_cpus(void) |
73 | { |
74 | if (cpu_hotplug.active_writer == current) |
75 | return; |
76 | mutex_lock(&cpu_hotplug.lock); |
77 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) |
78 | wake_up_process(cpu_hotplug.active_writer); |
79 | mutex_unlock(&cpu_hotplug.lock); |
80 | |
81 | } |
82 | EXPORT_SYMBOL_GPL(put_online_cpus); |
83 | |
84 | /* |
85 | * This ensures that the hotplug operation can begin only when the |
86 | * refcount goes to zero. |
87 | * |
88 | * Note that during a cpu-hotplug operation, the new readers, if any, |
89 | * will be blocked by the cpu_hotplug.lock |
90 | * |
91 | * Since cpu_hotplug_begin() is always called after invoking |
92 | * cpu_maps_update_begin(), we can be sure that only one writer is active. |
93 | * |
94 | * Note that theoretically, there is a possibility of a livelock: |
95 | * - Refcount goes to zero, last reader wakes up the sleeping |
96 | * writer. |
97 | * - Last reader unlocks the cpu_hotplug.lock. |
98 | * - A new reader arrives at this moment, bumps up the refcount. |
99 | * - The writer acquires the cpu_hotplug.lock finds the refcount |
100 | * non zero and goes to sleep again. |
101 | * |
102 | * However, this is very difficult to achieve in practice since |
103 | * get_online_cpus() not an api which is called all that often. |
104 | * |
105 | */ |
106 | static void cpu_hotplug_begin(void) |
107 | { |
108 | cpu_hotplug.active_writer = current; |
109 | |
110 | for (;;) { |
111 | mutex_lock(&cpu_hotplug.lock); |
112 | if (likely(!cpu_hotplug.refcount)) |
113 | break; |
114 | __set_current_state(TASK_UNINTERRUPTIBLE); |
115 | mutex_unlock(&cpu_hotplug.lock); |
116 | schedule(); |
117 | } |
118 | } |
119 | |
120 | static void cpu_hotplug_done(void) |
121 | { |
122 | cpu_hotplug.active_writer = NULL; |
123 | mutex_unlock(&cpu_hotplug.lock); |
124 | } |
125 | |
126 | #else /* #if CONFIG_HOTPLUG_CPU */ |
127 | static void cpu_hotplug_begin(void) {} |
128 | static void cpu_hotplug_done(void) {} |
129 | #endif /* #else #if CONFIG_HOTPLUG_CPU */ |
130 | |
131 | /* Need to know about CPUs going up/down? */ |
132 | int __ref register_cpu_notifier(struct notifier_block *nb) |
133 | { |
134 | int ret; |
135 | cpu_maps_update_begin(); |
136 | ret = raw_notifier_chain_register(&cpu_chain, nb); |
137 | cpu_maps_update_done(); |
138 | return ret; |
139 | } |
140 | |
141 | static int __cpu_notify(unsigned long val, void *v, int nr_to_call, |
142 | int *nr_calls) |
143 | { |
144 | int ret; |
145 | |
146 | ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call, |
147 | nr_calls); |
148 | |
149 | return notifier_to_errno(ret); |
150 | } |
151 | |
152 | static int cpu_notify(unsigned long val, void *v) |
153 | { |
154 | return __cpu_notify(val, v, -1, NULL); |
155 | } |
156 | |
157 | #ifdef CONFIG_HOTPLUG_CPU |
158 | |
159 | static void cpu_notify_nofail(unsigned long val, void *v) |
160 | { |
161 | BUG_ON(cpu_notify(val, v)); |
162 | } |
163 | EXPORT_SYMBOL(register_cpu_notifier); |
164 | |
165 | void __ref unregister_cpu_notifier(struct notifier_block *nb) |
166 | { |
167 | cpu_maps_update_begin(); |
168 | raw_notifier_chain_unregister(&cpu_chain, nb); |
169 | cpu_maps_update_done(); |
170 | } |
171 | EXPORT_SYMBOL(unregister_cpu_notifier); |
172 | |
173 | static inline void check_for_tasks(int cpu) |
174 | { |
175 | struct task_struct *p; |
176 | |
177 | write_lock_irq(&tasklist_lock); |
178 | for_each_process(p) { |
179 | if (task_cpu(p) == cpu && p->state == TASK_RUNNING && |
180 | (!cputime_eq(p->utime, cputime_zero) || |
181 | !cputime_eq(p->stime, cputime_zero))) |
182 | printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d " |
183 | "(state = %ld, flags = %x)\n", |
184 | p->comm, task_pid_nr(p), cpu, |
185 | p->state, p->flags); |
186 | } |
187 | write_unlock_irq(&tasklist_lock); |
188 | } |
189 | |
190 | struct take_cpu_down_param { |
191 | unsigned long mod; |
192 | void *hcpu; |
193 | }; |
194 | |
195 | /* Take this CPU down. */ |
196 | static int __ref take_cpu_down(void *_param) |
197 | { |
198 | struct take_cpu_down_param *param = _param; |
199 | int err; |
200 | |
201 | /* Ensure this CPU doesn't handle any more interrupts. */ |
202 | err = __cpu_disable(); |
203 | if (err < 0) |
204 | return err; |
205 | |
206 | cpu_notify(CPU_DYING | param->mod, param->hcpu); |
207 | return 0; |
208 | } |
209 | |
210 | /* Requires cpu_add_remove_lock to be held */ |
211 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) |
212 | { |
213 | int err, nr_calls = 0; |
214 | void *hcpu = (void *)(long)cpu; |
215 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
216 | struct take_cpu_down_param tcd_param = { |
217 | .mod = mod, |
218 | .hcpu = hcpu, |
219 | }; |
220 | |
221 | if (num_online_cpus() == 1) |
222 | return -EBUSY; |
223 | |
224 | if (!cpu_online(cpu)) |
225 | return -EINVAL; |
226 | |
227 | cpu_hotplug_begin(); |
228 | |
229 | err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); |
230 | if (err) { |
231 | nr_calls--; |
232 | __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); |
233 | printk("%s: attempt to take down CPU %u failed\n", |
234 | __func__, cpu); |
235 | goto out_release; |
236 | } |
237 | |
238 | err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); |
239 | if (err) { |
240 | /* CPU didn't die: tell everyone. Can't complain. */ |
241 | cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu); |
242 | |
243 | goto out_release; |
244 | } |
245 | BUG_ON(cpu_online(cpu)); |
246 | |
247 | /* |
248 | * The migration_call() CPU_DYING callback will have removed all |
249 | * runnable tasks from the cpu, there's only the idle task left now |
250 | * that the migration thread is done doing the stop_machine thing. |
251 | * |
252 | * Wait for the stop thread to go away. |
253 | */ |
254 | while (!idle_cpu(cpu)) |
255 | cpu_relax(); |
256 | |
257 | /* This actually kills the CPU. */ |
258 | __cpu_die(cpu); |
259 | |
260 | /* CPU is completely dead: tell everyone. Too late to complain. */ |
261 | cpu_notify_nofail(CPU_DEAD | mod, hcpu); |
262 | |
263 | check_for_tasks(cpu); |
264 | |
265 | out_release: |
266 | cpu_hotplug_done(); |
267 | if (!err) |
268 | cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); |
269 | return err; |
270 | } |
271 | |
272 | int __ref cpu_down(unsigned int cpu) |
273 | { |
274 | int err; |
275 | |
276 | cpu_maps_update_begin(); |
277 | |
278 | if (cpu_hotplug_disabled) { |
279 | err = -EBUSY; |
280 | goto out; |
281 | } |
282 | |
283 | err = _cpu_down(cpu, 0); |
284 | |
285 | out: |
286 | cpu_maps_update_done(); |
287 | return err; |
288 | } |
289 | EXPORT_SYMBOL(cpu_down); |
290 | #endif /*CONFIG_HOTPLUG_CPU*/ |
291 | |
292 | /* Requires cpu_add_remove_lock to be held */ |
293 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) |
294 | { |
295 | int ret, nr_calls = 0; |
296 | void *hcpu = (void *)(long)cpu; |
297 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
298 | |
299 | if (cpu_online(cpu) || !cpu_present(cpu)) |
300 | return -EINVAL; |
301 | |
302 | cpu_hotplug_begin(); |
303 | ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); |
304 | if (ret) { |
305 | nr_calls--; |
306 | printk(KERN_WARNING "%s: attempt to bring up CPU %u failed\n", |
307 | __func__, cpu); |
308 | goto out_notify; |
309 | } |
310 | |
311 | /* Arch-specific enabling code. */ |
312 | ret = __cpu_up(cpu); |
313 | if (ret != 0) |
314 | goto out_notify; |
315 | BUG_ON(!cpu_online(cpu)); |
316 | |
317 | /* Now call notifier in preparation. */ |
318 | cpu_notify(CPU_ONLINE | mod, hcpu); |
319 | |
320 | out_notify: |
321 | if (ret != 0) |
322 | __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); |
323 | cpu_hotplug_done(); |
324 | |
325 | return ret; |
326 | } |
327 | |
328 | int __cpuinit cpu_up(unsigned int cpu) |
329 | { |
330 | int err = 0; |
331 | |
332 | #ifdef CONFIG_MEMORY_HOTPLUG |
333 | int nid; |
334 | pg_data_t *pgdat; |
335 | #endif |
336 | |
337 | if (!cpu_possible(cpu)) { |
338 | printk(KERN_ERR "can't online cpu %d because it is not " |
339 | "configured as may-hotadd at boot time\n", cpu); |
340 | #if defined(CONFIG_IA64) |
341 | printk(KERN_ERR "please check additional_cpus= boot " |
342 | "parameter\n"); |
343 | #endif |
344 | return -EINVAL; |
345 | } |
346 | |
347 | #ifdef CONFIG_MEMORY_HOTPLUG |
348 | nid = cpu_to_node(cpu); |
349 | if (!node_online(nid)) { |
350 | err = mem_online_node(nid); |
351 | if (err) |
352 | return err; |
353 | } |
354 | |
355 | pgdat = NODE_DATA(nid); |
356 | if (!pgdat) { |
357 | printk(KERN_ERR |
358 | "Can't online cpu %d due to NULL pgdat\n", cpu); |
359 | return -ENOMEM; |
360 | } |
361 | |
362 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
363 | mutex_lock(&zonelists_mutex); |
364 | build_all_zonelists(NULL); |
365 | mutex_unlock(&zonelists_mutex); |
366 | } |
367 | #endif |
368 | |
369 | cpu_maps_update_begin(); |
370 | |
371 | if (cpu_hotplug_disabled) { |
372 | err = -EBUSY; |
373 | goto out; |
374 | } |
375 | |
376 | err = _cpu_up(cpu, 0); |
377 | |
378 | out: |
379 | cpu_maps_update_done(); |
380 | return err; |
381 | } |
382 | |
383 | #ifdef CONFIG_PM_SLEEP_SMP |
384 | static cpumask_var_t frozen_cpus; |
385 | |
386 | void __weak arch_disable_nonboot_cpus_begin(void) |
387 | { |
388 | } |
389 | |
390 | void __weak arch_disable_nonboot_cpus_end(void) |
391 | { |
392 | } |
393 | |
394 | int disable_nonboot_cpus(void) |
395 | { |
396 | int cpu, first_cpu, error = 0; |
397 | |
398 | cpu_maps_update_begin(); |
399 | first_cpu = cpumask_first(cpu_online_mask); |
400 | /* |
401 | * We take down all of the non-boot CPUs in one shot to avoid races |
402 | * with the userspace trying to use the CPU hotplug at the same time |
403 | */ |
404 | cpumask_clear(frozen_cpus); |
405 | arch_disable_nonboot_cpus_begin(); |
406 | |
407 | printk("Disabling non-boot CPUs ...\n"); |
408 | for_each_online_cpu(cpu) { |
409 | if (cpu == first_cpu) |
410 | continue; |
411 | error = _cpu_down(cpu, 1); |
412 | if (!error) |
413 | cpumask_set_cpu(cpu, frozen_cpus); |
414 | else { |
415 | printk(KERN_ERR "Error taking CPU%d down: %d\n", |
416 | cpu, error); |
417 | break; |
418 | } |
419 | } |
420 | |
421 | arch_disable_nonboot_cpus_end(); |
422 | |
423 | if (!error) { |
424 | BUG_ON(num_online_cpus() > 1); |
425 | /* Make sure the CPUs won't be enabled by someone else */ |
426 | cpu_hotplug_disabled = 1; |
427 | } else { |
428 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); |
429 | } |
430 | cpu_maps_update_done(); |
431 | return error; |
432 | } |
433 | |
434 | void __weak arch_enable_nonboot_cpus_begin(void) |
435 | { |
436 | } |
437 | |
438 | void __weak arch_enable_nonboot_cpus_end(void) |
439 | { |
440 | } |
441 | |
442 | void __ref enable_nonboot_cpus(void) |
443 | { |
444 | int cpu, error; |
445 | |
446 | /* Allow everyone to use the CPU hotplug again */ |
447 | cpu_maps_update_begin(); |
448 | cpu_hotplug_disabled = 0; |
449 | if (cpumask_empty(frozen_cpus)) |
450 | goto out; |
451 | |
452 | printk(KERN_INFO "Enabling non-boot CPUs ...\n"); |
453 | |
454 | arch_enable_nonboot_cpus_begin(); |
455 | |
456 | for_each_cpu(cpu, frozen_cpus) { |
457 | error = _cpu_up(cpu, 1); |
458 | if (!error) { |
459 | printk(KERN_INFO "CPU%d is up\n", cpu); |
460 | continue; |
461 | } |
462 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); |
463 | } |
464 | |
465 | arch_enable_nonboot_cpus_end(); |
466 | |
467 | cpumask_clear(frozen_cpus); |
468 | out: |
469 | cpu_maps_update_done(); |
470 | } |
471 | |
472 | static int alloc_frozen_cpus(void) |
473 | { |
474 | if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) |
475 | return -ENOMEM; |
476 | return 0; |
477 | } |
478 | core_initcall(alloc_frozen_cpus); |
479 | #endif /* CONFIG_PM_SLEEP_SMP */ |
480 | |
481 | /** |
482 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers |
483 | * @cpu: cpu that just started |
484 | * |
485 | * This function calls the cpu_chain notifiers with CPU_STARTING. |
486 | * It must be called by the arch code on the new cpu, before the new cpu |
487 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). |
488 | */ |
489 | void __cpuinit notify_cpu_starting(unsigned int cpu) |
490 | { |
491 | unsigned long val = CPU_STARTING; |
492 | |
493 | #ifdef CONFIG_PM_SLEEP_SMP |
494 | if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) |
495 | val = CPU_STARTING_FROZEN; |
496 | #endif /* CONFIG_PM_SLEEP_SMP */ |
497 | cpu_notify(val, (void *)(long)cpu); |
498 | } |
499 | |
500 | #endif /* CONFIG_SMP */ |
501 | |
502 | /* |
503 | * cpu_bit_bitmap[] is a special, "compressed" data structure that |
504 | * represents all NR_CPUS bits binary values of 1<<nr. |
505 | * |
506 | * It is used by cpumask_of() to get a constant address to a CPU |
507 | * mask value that has a single bit set only. |
508 | */ |
509 | |
510 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ |
511 | #define MASK_DECLARE_1(x) [x+1][0] = (1UL << (x)) |
512 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) |
513 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) |
514 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) |
515 | |
516 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { |
517 | |
518 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), |
519 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), |
520 | #if BITS_PER_LONG > 32 |
521 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), |
522 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), |
523 | #endif |
524 | }; |
525 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
526 | |
527 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; |
528 | EXPORT_SYMBOL(cpu_all_bits); |
529 | |
530 | #ifdef CONFIG_INIT_ALL_POSSIBLE |
531 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly |
532 | = CPU_BITS_ALL; |
533 | #else |
534 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; |
535 | #endif |
536 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); |
537 | EXPORT_SYMBOL(cpu_possible_mask); |
538 | |
539 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; |
540 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); |
541 | EXPORT_SYMBOL(cpu_online_mask); |
542 | |
543 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; |
544 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); |
545 | EXPORT_SYMBOL(cpu_present_mask); |
546 | |
547 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; |
548 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); |
549 | EXPORT_SYMBOL(cpu_active_mask); |
550 | |
551 | void set_cpu_possible(unsigned int cpu, bool possible) |
552 | { |
553 | if (possible) |
554 | cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); |
555 | else |
556 | cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); |
557 | } |
558 | |
559 | void set_cpu_present(unsigned int cpu, bool present) |
560 | { |
561 | if (present) |
562 | cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); |
563 | else |
564 | cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); |
565 | } |
566 | |
567 | void set_cpu_online(unsigned int cpu, bool online) |
568 | { |
569 | if (online) |
570 | cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); |
571 | else |
572 | cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); |
573 | } |
574 | |
575 | void set_cpu_active(unsigned int cpu, bool active) |
576 | { |
577 | if (active) |
578 | cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); |
579 | else |
580 | cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); |
581 | } |
582 | |
583 | void init_cpu_present(const struct cpumask *src) |
584 | { |
585 | cpumask_copy(to_cpumask(cpu_present_bits), src); |
586 | } |
587 | |
588 | void init_cpu_possible(const struct cpumask *src) |
589 | { |
590 | cpumask_copy(to_cpumask(cpu_possible_bits), src); |
591 | } |
592 | |
593 | void init_cpu_online(const struct cpumask *src) |
594 | { |
595 | cpumask_copy(to_cpumask(cpu_online_bits), src); |
596 | } |
597 |
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