Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Ingo Molnar | 81615b6 | 2006-06-26 00:24:32 -0700 | [diff] [blame] | 16 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Rusty Russell | 98a79d6 | 2008-12-13 21:19:41 +1030 | [diff] [blame] | 19 | #ifdef CONFIG_SMP |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 20 | /* Serializes the updates to cpu_online_mask, cpu_present_mask */ |
Linus Torvalds | aa95387 | 2006-07-23 12:12:16 -0700 | [diff] [blame] | 21 | static DEFINE_MUTEX(cpu_add_remove_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Lai Jiangshan | 79a6cde | 2010-05-26 14:43:36 -0700 | [diff] [blame] | 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 | |
Daniel J Blueman | 5c113fb | 2010-06-01 12:15:11 +0100 | [diff] [blame] | 37 | static RAW_NOTIFIER_HEAD(cpu_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 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 | |
Lai Jiangshan | 79a6cde | 2010-05-26 14:43:36 -0700 | [diff] [blame] | 44 | #ifdef CONFIG_HOTPLUG_CPU |
| 45 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 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; |
Linus Torvalds | 31950eb | 2009-06-22 21:18:12 -0700 | [diff] [blame] | 54 | } cpu_hotplug = { |
| 55 | .active_writer = NULL, |
| 56 | .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock), |
| 57 | .refcount = 0, |
| 58 | }; |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 59 | |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 60 | void get_online_cpus(void) |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 61 | { |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 62 | might_sleep(); |
| 63 | if (cpu_hotplug.active_writer == current) |
Linus Torvalds | aa95387 | 2006-07-23 12:12:16 -0700 | [diff] [blame] | 64 | return; |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 65 | mutex_lock(&cpu_hotplug.lock); |
| 66 | cpu_hotplug.refcount++; |
| 67 | mutex_unlock(&cpu_hotplug.lock); |
| 68 | |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 69 | } |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 70 | EXPORT_SYMBOL_GPL(get_online_cpus); |
Ashok Raj | 90d45d1 | 2005-11-08 21:34:24 -0800 | [diff] [blame] | 71 | |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 72 | void put_online_cpus(void) |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 73 | { |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 74 | if (cpu_hotplug.active_writer == current) |
Linus Torvalds | aa95387 | 2006-07-23 12:12:16 -0700 | [diff] [blame] | 75 | return; |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 76 | mutex_lock(&cpu_hotplug.lock); |
Oleg Nesterov | d2ba7e2 | 2008-04-29 01:00:29 -0700 | [diff] [blame] | 77 | if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer)) |
| 78 | wake_up_process(cpu_hotplug.active_writer); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 79 | mutex_unlock(&cpu_hotplug.lock); |
| 80 | |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 81 | } |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 82 | EXPORT_SYMBOL_GPL(put_online_cpus); |
Ashok Raj | a9d9baa | 2005-11-28 13:43:46 -0800 | [diff] [blame] | 83 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 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 | * |
Oleg Nesterov | d2ba7e2 | 2008-04-29 01:00:29 -0700 | [diff] [blame] | 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. |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 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 |
Gautham R Shenoy | 86ef5c9 | 2008-01-25 21:08:02 +0100 | [diff] [blame] | 103 | * get_online_cpus() not an api which is called all that often. |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 104 | * |
| 105 | */ |
| 106 | static void cpu_hotplug_begin(void) |
| 107 | { |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 108 | cpu_hotplug.active_writer = current; |
Oleg Nesterov | d2ba7e2 | 2008-04-29 01:00:29 -0700 | [diff] [blame] | 109 | |
| 110 | for (;;) { |
| 111 | mutex_lock(&cpu_hotplug.lock); |
| 112 | if (likely(!cpu_hotplug.refcount)) |
| 113 | break; |
| 114 | __set_current_state(TASK_UNINTERRUPTIBLE); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 115 | mutex_unlock(&cpu_hotplug.lock); |
| 116 | schedule(); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 117 | } |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | static void cpu_hotplug_done(void) |
| 121 | { |
| 122 | cpu_hotplug.active_writer = NULL; |
| 123 | mutex_unlock(&cpu_hotplug.lock); |
| 124 | } |
Lai Jiangshan | 79a6cde | 2010-05-26 14:43:36 -0700 | [diff] [blame] | 125 | |
| 126 | #else /* #if CONFIG_HOTPLUG_CPU */ |
| 127 | static void cpu_hotplug_begin(void) {} |
| 128 | static void cpu_hotplug_done(void) {} |
| 129 | #endif /* #esle #if CONFIG_HOTPLUG_CPU */ |
| 130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | /* Need to know about CPUs going up/down? */ |
Sam Ravnborg | f7b16c1 | 2008-04-29 00:58:51 -0700 | [diff] [blame] | 132 | int __ref register_cpu_notifier(struct notifier_block *nb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | { |
Neil Brown | bd5349c | 2006-10-17 00:10:35 -0700 | [diff] [blame] | 134 | int ret; |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 135 | cpu_maps_update_begin(); |
Neil Brown | bd5349c | 2006-10-17 00:10:35 -0700 | [diff] [blame] | 136 | ret = raw_notifier_chain_register(&cpu_chain, nb); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 137 | cpu_maps_update_done(); |
Neil Brown | bd5349c | 2006-10-17 00:10:35 -0700 | [diff] [blame] | 138 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
Chandra Seetharaman | 65edc68 | 2006-06-27 02:54:08 -0700 | [diff] [blame] | 140 | |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 141 | static int __cpu_notify(unsigned long val, void *v, int nr_to_call, |
| 142 | int *nr_calls) |
| 143 | { |
Akinobu Mita | e6bde73 | 2010-05-26 14:43:29 -0700 | [diff] [blame] | 144 | int ret; |
| 145 | |
| 146 | ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call, |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 147 | nr_calls); |
Akinobu Mita | e6bde73 | 2010-05-26 14:43:29 -0700 | [diff] [blame] | 148 | |
| 149 | return notifier_to_errno(ret); |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | static int cpu_notify(unsigned long val, void *v) |
| 153 | { |
| 154 | return __cpu_notify(val, v, -1, NULL); |
| 155 | } |
| 156 | |
Linus Torvalds | 00b9b0a | 2010-05-27 10:32:08 -0700 | [diff] [blame] | 157 | #ifdef CONFIG_HOTPLUG_CPU |
| 158 | |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 159 | static void cpu_notify_nofail(unsigned long val, void *v) |
| 160 | { |
Linus Torvalds | 00b9b0a | 2010-05-27 10:32:08 -0700 | [diff] [blame] | 161 | BUG_ON(cpu_notify(val, v)); |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | EXPORT_SYMBOL(register_cpu_notifier); |
| 165 | |
Sam Ravnborg | 9647155 | 2008-04-29 00:58:48 -0700 | [diff] [blame] | 166 | void __ref unregister_cpu_notifier(struct notifier_block *nb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 168 | cpu_maps_update_begin(); |
Neil Brown | bd5349c | 2006-10-17 00:10:35 -0700 | [diff] [blame] | 169 | raw_notifier_chain_unregister(&cpu_chain, nb); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 170 | cpu_maps_update_done(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | EXPORT_SYMBOL(unregister_cpu_notifier); |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | static inline void check_for_tasks(int cpu) |
| 175 | { |
| 176 | struct task_struct *p; |
| 177 | |
| 178 | write_lock_irq(&tasklist_lock); |
| 179 | for_each_process(p) { |
Peter Zijlstra | 1185424 | 2010-01-21 16:34:27 +0100 | [diff] [blame] | 180 | if (task_cpu(p) == cpu && p->state == TASK_RUNNING && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | (!cputime_eq(p->utime, cputime_zero) || |
| 182 | !cputime_eq(p->stime, cputime_zero))) |
Frans Pop | 9d3cfc4 | 2010-01-25 14:56:34 +0100 | [diff] [blame] | 183 | printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d " |
| 184 | "(state = %ld, flags = %x)\n", |
| 185 | p->comm, task_pid_nr(p), cpu, |
| 186 | p->state, p->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | write_unlock_irq(&tasklist_lock); |
| 189 | } |
| 190 | |
Avi Kivity | db912f9 | 2007-05-24 12:23:10 +0300 | [diff] [blame] | 191 | struct take_cpu_down_param { |
Oleg Nesterov | 6a1bdc1 | 2010-03-15 10:10:23 +0100 | [diff] [blame] | 192 | struct task_struct *caller; |
Avi Kivity | db912f9 | 2007-05-24 12:23:10 +0300 | [diff] [blame] | 193 | unsigned long mod; |
| 194 | void *hcpu; |
| 195 | }; |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | /* Take this CPU down. */ |
Sam Ravnborg | 514a20a | 2008-04-29 00:58:50 -0700 | [diff] [blame] | 198 | static int __ref take_cpu_down(void *_param) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Avi Kivity | db912f9 | 2007-05-24 12:23:10 +0300 | [diff] [blame] | 200 | struct take_cpu_down_param *param = _param; |
Oleg Nesterov | 6a1bdc1 | 2010-03-15 10:10:23 +0100 | [diff] [blame] | 201 | unsigned int cpu = (unsigned long)param->hcpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | int err; |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* Ensure this CPU doesn't handle any more interrupts. */ |
| 205 | err = __cpu_disable(); |
| 206 | if (err < 0) |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 207 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 209 | cpu_notify(CPU_DYING | param->mod, param->hcpu); |
Manfred Spraul | 3ba3557 | 2008-08-31 19:58:49 +0200 | [diff] [blame] | 210 | |
Oleg Nesterov | 6a1bdc1 | 2010-03-15 10:10:23 +0100 | [diff] [blame] | 211 | if (task_cpu(param->caller) == cpu) |
| 212 | move_task_off_dead_cpu(cpu, param->caller); |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 213 | /* Force idle task to run as soon as we yield: it should |
| 214 | immediately notice cpu is offline and die quickly. */ |
| 215 | sched_idle_next(); |
| 216 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 219 | /* Requires cpu_add_remove_lock to be held */ |
Sam Ravnborg | 514a20a | 2008-04-29 00:58:50 -0700 | [diff] [blame] | 220 | static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
Heiko Carstens | e7407dc | 2007-05-09 02:34:04 -0700 | [diff] [blame] | 222 | int err, nr_calls = 0; |
Heiko Carstens | e7407dc | 2007-05-09 02:34:04 -0700 | [diff] [blame] | 223 | void *hcpu = (void *)(long)cpu; |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 224 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
Avi Kivity | db912f9 | 2007-05-24 12:23:10 +0300 | [diff] [blame] | 225 | struct take_cpu_down_param tcd_param = { |
Oleg Nesterov | 6a1bdc1 | 2010-03-15 10:10:23 +0100 | [diff] [blame] | 226 | .caller = current, |
Avi Kivity | db912f9 | 2007-05-24 12:23:10 +0300 | [diff] [blame] | 227 | .mod = mod, |
| 228 | .hcpu = hcpu, |
| 229 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 231 | if (num_online_cpus() == 1) |
| 232 | return -EBUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 234 | if (!cpu_online(cpu)) |
| 235 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 237 | cpu_hotplug_begin(); |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 238 | err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); |
Akinobu Mita | e6bde73 | 2010-05-26 14:43:29 -0700 | [diff] [blame] | 239 | if (err) { |
Akinobu Mita | a0d8cdb | 2007-10-18 03:05:12 -0700 | [diff] [blame] | 240 | nr_calls--; |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 241 | __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | printk("%s: attempt to take down CPU %u failed\n", |
Harvey Harrison | af1f16d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 243 | __func__, cpu); |
Gautham R Shenoy | baaca49 | 2007-05-09 02:34:03 -0700 | [diff] [blame] | 244 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 247 | err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); |
Rusty Russell | 0432158 | 2008-07-28 12:16:29 -0500 | [diff] [blame] | 248 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | /* CPU didn't die: tell everyone. Can't complain. */ |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 250 | cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
Oleg Nesterov | 6a1bdc1 | 2010-03-15 10:10:23 +0100 | [diff] [blame] | 252 | goto out_release; |
Satoru Takeuchi | 8fa1d7d | 2006-10-28 10:38:57 -0700 | [diff] [blame] | 253 | } |
Rusty Russell | 0432158 | 2008-07-28 12:16:29 -0500 | [diff] [blame] | 254 | BUG_ON(cpu_online(cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | /* Wait for it to sleep (leaving idle task). */ |
| 257 | while (!idle_cpu(cpu)) |
| 258 | yield(); |
| 259 | |
| 260 | /* This actually kills the CPU. */ |
| 261 | __cpu_die(cpu); |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /* CPU is completely dead: tell everyone. Too late to complain. */ |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 264 | cpu_notify_nofail(CPU_DEAD | mod, hcpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | check_for_tasks(cpu); |
| 267 | |
Gautham R Shenoy | baaca49 | 2007-05-09 02:34:03 -0700 | [diff] [blame] | 268 | out_release: |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 269 | cpu_hotplug_done(); |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 270 | if (!err) |
| 271 | cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 272 | return err; |
| 273 | } |
| 274 | |
Sam Ravnborg | 514a20a | 2008-04-29 00:58:50 -0700 | [diff] [blame] | 275 | int __ref cpu_down(unsigned int cpu) |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 276 | { |
Heiko Carstens | 9ea09af | 2008-12-22 12:36:30 +0100 | [diff] [blame] | 277 | int err; |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 278 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 279 | cpu_maps_update_begin(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 280 | |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 281 | if (cpu_hotplug_disabled) { |
| 282 | err = -EBUSY; |
| 283 | goto out; |
| 284 | } |
| 285 | |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 286 | err = _cpu_down(cpu, 0); |
| 287 | |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 288 | out: |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 289 | cpu_maps_update_done(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return err; |
| 291 | } |
Zhang Rui | b62b8ef | 2008-04-29 02:35:56 -0400 | [diff] [blame] | 292 | EXPORT_SYMBOL(cpu_down); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | #endif /*CONFIG_HOTPLUG_CPU*/ |
| 294 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 295 | /* Requires cpu_add_remove_lock to be held */ |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 296 | static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Gautham R Shenoy | baaca49 | 2007-05-09 02:34:03 -0700 | [diff] [blame] | 298 | int ret, nr_calls = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | void *hcpu = (void *)(long)cpu; |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 300 | unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 302 | if (cpu_online(cpu) || !cpu_present(cpu)) |
| 303 | return -EINVAL; |
Ashok Raj | 90d45d1 | 2005-11-08 21:34:24 -0800 | [diff] [blame] | 304 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 305 | cpu_hotplug_begin(); |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 306 | ret = __cpu_notify(CPU_UP_PREPARE | mod, hcpu, -1, &nr_calls); |
Akinobu Mita | e6bde73 | 2010-05-26 14:43:29 -0700 | [diff] [blame] | 307 | if (ret) { |
Akinobu Mita | a0d8cdb | 2007-10-18 03:05:12 -0700 | [diff] [blame] | 308 | nr_calls--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | printk("%s: attempt to bring up CPU %u failed\n", |
Harvey Harrison | af1f16d | 2008-04-30 00:55:08 -0700 | [diff] [blame] | 310 | __func__, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | goto out_notify; |
| 312 | } |
| 313 | |
| 314 | /* Arch-specific enabling code. */ |
| 315 | ret = __cpu_up(cpu); |
| 316 | if (ret != 0) |
| 317 | goto out_notify; |
Eric Sesterhenn | 6978c70 | 2006-03-24 18:45:21 +0100 | [diff] [blame] | 318 | BUG_ON(!cpu_online(cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | /* Now call notifier in preparation. */ |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 321 | cpu_notify(CPU_ONLINE | mod, hcpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | out_notify: |
| 324 | if (ret != 0) |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 325 | __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 326 | cpu_hotplug_done(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | return ret; |
| 329 | } |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 330 | |
Gautham R Shenoy | b282b6f | 2007-01-10 23:15:34 -0800 | [diff] [blame] | 331 | int __cpuinit cpu_up(unsigned int cpu) |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 332 | { |
| 333 | int err = 0; |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 334 | |
| 335 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 336 | int nid; |
| 337 | pg_data_t *pgdat; |
| 338 | #endif |
| 339 | |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 340 | if (!cpu_possible(cpu)) { |
KAMEZAWA Hiroyuki | 73e753a | 2007-10-18 23:40:47 -0700 | [diff] [blame] | 341 | printk(KERN_ERR "can't online cpu %d because it is not " |
| 342 | "configured as may-hotadd at boot time\n", cpu); |
Chen Gong | 87d5e02 | 2010-03-05 13:42:38 -0800 | [diff] [blame] | 343 | #if defined(CONFIG_IA64) |
KAMEZAWA Hiroyuki | 73e753a | 2007-10-18 23:40:47 -0700 | [diff] [blame] | 344 | printk(KERN_ERR "please check additional_cpus= boot " |
| 345 | "parameter\n"); |
| 346 | #endif |
| 347 | return -EINVAL; |
| 348 | } |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 349 | |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 350 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 351 | nid = cpu_to_node(cpu); |
| 352 | if (!node_online(nid)) { |
| 353 | err = mem_online_node(nid); |
| 354 | if (err) |
| 355 | return err; |
| 356 | } |
| 357 | |
| 358 | pgdat = NODE_DATA(nid); |
| 359 | if (!pgdat) { |
| 360 | printk(KERN_ERR |
| 361 | "Can't online cpu %d due to NULL pgdat\n", cpu); |
| 362 | return -ENOMEM; |
| 363 | } |
| 364 | |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 365 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
| 366 | mutex_lock(&zonelists_mutex); |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 367 | build_all_zonelists(NULL); |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 368 | mutex_unlock(&zonelists_mutex); |
| 369 | } |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 370 | #endif |
| 371 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 372 | cpu_maps_update_begin(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 373 | |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 374 | if (cpu_hotplug_disabled) { |
| 375 | err = -EBUSY; |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | err = _cpu_up(cpu, 0); |
| 380 | |
Max Krasnyansky | e761b77 | 2008-07-15 04:43:49 -0700 | [diff] [blame] | 381 | out: |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 382 | cpu_maps_update_done(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 383 | return err; |
| 384 | } |
| 385 | |
Rafael J. Wysocki | f3de4be | 2007-08-30 23:56:29 -0700 | [diff] [blame] | 386 | #ifdef CONFIG_PM_SLEEP_SMP |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 387 | static cpumask_var_t frozen_cpus; |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 388 | |
| 389 | int disable_nonboot_cpus(void) |
| 390 | { |
Rafael J. Wysocki | e9a5f42 | 2010-05-27 22:16:22 +0200 | [diff] [blame] | 391 | int cpu, first_cpu, error = 0; |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 392 | |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 393 | cpu_maps_update_begin(); |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 394 | first_cpu = cpumask_first(cpu_online_mask); |
Xiaotian Feng | 9ee349a | 2009-12-16 18:04:32 +0100 | [diff] [blame] | 395 | /* |
| 396 | * We take down all of the non-boot CPUs in one shot to avoid races |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 397 | * with the userspace trying to use the CPU hotplug at the same time |
| 398 | */ |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 399 | cpumask_clear(frozen_cpus); |
Peter Zijlstra | 6ad4c18 | 2009-11-25 13:31:39 +0100 | [diff] [blame] | 400 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 401 | printk("Disabling non-boot CPUs ...\n"); |
| 402 | for_each_online_cpu(cpu) { |
| 403 | if (cpu == first_cpu) |
| 404 | continue; |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 405 | error = _cpu_down(cpu, 1); |
Mike Travis | feae320 | 2009-11-17 18:22:13 -0600 | [diff] [blame] | 406 | if (!error) |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 407 | cpumask_set_cpu(cpu, frozen_cpus); |
Mike Travis | feae320 | 2009-11-17 18:22:13 -0600 | [diff] [blame] | 408 | else { |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 409 | printk(KERN_ERR "Error taking CPU%d down: %d\n", |
| 410 | cpu, error); |
| 411 | break; |
| 412 | } |
| 413 | } |
Joseph Cihula | 86886e5 | 2009-06-30 19:31:07 -0700 | [diff] [blame] | 414 | |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 415 | if (!error) { |
| 416 | BUG_ON(num_online_cpus() > 1); |
| 417 | /* Make sure the CPUs won't be enabled by someone else */ |
| 418 | cpu_hotplug_disabled = 1; |
| 419 | } else { |
Ingo Molnar | e1d9fd2 | 2006-12-23 16:55:29 +0100 | [diff] [blame] | 420 | printk(KERN_ERR "Non-boot CPUs are not disabled\n"); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 421 | } |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 422 | cpu_maps_update_done(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 423 | return error; |
| 424 | } |
| 425 | |
Suresh Siddha | d0af9ee | 2009-08-19 18:05:36 -0700 | [diff] [blame] | 426 | void __weak arch_enable_nonboot_cpus_begin(void) |
| 427 | { |
| 428 | } |
| 429 | |
| 430 | void __weak arch_enable_nonboot_cpus_end(void) |
| 431 | { |
| 432 | } |
| 433 | |
Sam Ravnborg | fa7303e | 2008-02-08 04:21:55 -0800 | [diff] [blame] | 434 | void __ref enable_nonboot_cpus(void) |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 435 | { |
| 436 | int cpu, error; |
| 437 | |
| 438 | /* Allow everyone to use the CPU hotplug again */ |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 439 | cpu_maps_update_begin(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 440 | cpu_hotplug_disabled = 0; |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 441 | if (cpumask_empty(frozen_cpus)) |
Rafael J. Wysocki | 1d64b9c | 2007-04-01 23:49:49 -0700 | [diff] [blame] | 442 | goto out; |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 443 | |
| 444 | printk("Enabling non-boot CPUs ...\n"); |
Suresh Siddha | d0af9ee | 2009-08-19 18:05:36 -0700 | [diff] [blame] | 445 | |
| 446 | arch_enable_nonboot_cpus_begin(); |
| 447 | |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 448 | for_each_cpu(cpu, frozen_cpus) { |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 449 | error = _cpu_up(cpu, 1); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 450 | if (!error) { |
| 451 | printk("CPU%d is up\n", cpu); |
| 452 | continue; |
| 453 | } |
Rafael J. Wysocki | 1d64b9c | 2007-04-01 23:49:49 -0700 | [diff] [blame] | 454 | printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 455 | } |
Suresh Siddha | d0af9ee | 2009-08-19 18:05:36 -0700 | [diff] [blame] | 456 | |
| 457 | arch_enable_nonboot_cpus_end(); |
| 458 | |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 459 | cpumask_clear(frozen_cpus); |
Rafael J. Wysocki | 1d64b9c | 2007-04-01 23:49:49 -0700 | [diff] [blame] | 460 | out: |
Gautham R Shenoy | d221938 | 2008-01-25 21:08:01 +0100 | [diff] [blame] | 461 | cpu_maps_update_done(); |
Rafael J. Wysocki | e3920fb | 2006-09-25 23:32:48 -0700 | [diff] [blame] | 462 | } |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 463 | |
| 464 | static int alloc_frozen_cpus(void) |
| 465 | { |
| 466 | if (!alloc_cpumask_var(&frozen_cpus, GFP_KERNEL|__GFP_ZERO)) |
| 467 | return -ENOMEM; |
| 468 | return 0; |
| 469 | } |
| 470 | core_initcall(alloc_frozen_cpus); |
Rafael J. Wysocki | f3de4be | 2007-08-30 23:56:29 -0700 | [diff] [blame] | 471 | #endif /* CONFIG_PM_SLEEP_SMP */ |
Max Krasnyansky | 68f4f1e | 2008-05-29 11:17:02 -0700 | [diff] [blame] | 472 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 473 | /** |
| 474 | * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers |
| 475 | * @cpu: cpu that just started |
| 476 | * |
| 477 | * This function calls the cpu_chain notifiers with CPU_STARTING. |
| 478 | * It must be called by the arch code on the new cpu, before the new cpu |
| 479 | * enables interrupts and before the "boot" cpu returns from __cpu_up(). |
| 480 | */ |
Al Viro | 8419641 | 2008-11-22 17:36:44 +0000 | [diff] [blame] | 481 | void __cpuinit notify_cpu_starting(unsigned int cpu) |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 482 | { |
| 483 | unsigned long val = CPU_STARTING; |
| 484 | |
| 485 | #ifdef CONFIG_PM_SLEEP_SMP |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 486 | if (frozen_cpus != NULL && cpumask_test_cpu(cpu, frozen_cpus)) |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 487 | val = CPU_STARTING_FROZEN; |
| 488 | #endif /* CONFIG_PM_SLEEP_SMP */ |
Akinobu Mita | e9fb763 | 2010-05-26 14:43:28 -0700 | [diff] [blame] | 489 | cpu_notify(val, (void *)(long)cpu); |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 490 | } |
| 491 | |
Max Krasnyansky | 68f4f1e | 2008-05-29 11:17:02 -0700 | [diff] [blame] | 492 | #endif /* CONFIG_SMP */ |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 493 | |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 494 | /* |
| 495 | * cpu_bit_bitmap[] is a special, "compressed" data structure that |
| 496 | * represents all NR_CPUS bits binary values of 1<<nr. |
| 497 | * |
Rusty Russell | e0b582e | 2009-01-01 10:12:28 +1030 | [diff] [blame] | 498 | * It is used by cpumask_of() to get a constant address to a CPU |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 499 | * mask value that has a single bit set only. |
| 500 | */ |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 501 | |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 502 | /* cpu_bit_bitmap[0] is empty - so we can back into it */ |
| 503 | #define MASK_DECLARE_1(x) [x+1][0] = 1UL << (x) |
| 504 | #define MASK_DECLARE_2(x) MASK_DECLARE_1(x), MASK_DECLARE_1(x+1) |
| 505 | #define MASK_DECLARE_4(x) MASK_DECLARE_2(x), MASK_DECLARE_2(x+2) |
| 506 | #define MASK_DECLARE_8(x) MASK_DECLARE_4(x), MASK_DECLARE_4(x+4) |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 507 | |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 508 | const unsigned long cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)] = { |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 509 | |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 510 | MASK_DECLARE_8(0), MASK_DECLARE_8(8), |
| 511 | MASK_DECLARE_8(16), MASK_DECLARE_8(24), |
| 512 | #if BITS_PER_LONG > 32 |
| 513 | MASK_DECLARE_8(32), MASK_DECLARE_8(40), |
| 514 | MASK_DECLARE_8(48), MASK_DECLARE_8(56), |
Mike Travis | b8d317d | 2008-07-24 18:21:29 -0700 | [diff] [blame] | 515 | #endif |
| 516 | }; |
Linus Torvalds | e56b3bc | 2008-07-28 11:32:33 -0700 | [diff] [blame] | 517 | EXPORT_SYMBOL_GPL(cpu_bit_bitmap); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 518 | |
| 519 | const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL; |
| 520 | EXPORT_SYMBOL(cpu_all_bits); |
Rusty Russell | b3199c0 | 2008-12-30 09:05:14 +1030 | [diff] [blame] | 521 | |
| 522 | #ifdef CONFIG_INIT_ALL_POSSIBLE |
| 523 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly |
| 524 | = CPU_BITS_ALL; |
| 525 | #else |
| 526 | static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly; |
| 527 | #endif |
| 528 | const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits); |
| 529 | EXPORT_SYMBOL(cpu_possible_mask); |
| 530 | |
| 531 | static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly; |
| 532 | const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits); |
| 533 | EXPORT_SYMBOL(cpu_online_mask); |
| 534 | |
| 535 | static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly; |
| 536 | const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits); |
| 537 | EXPORT_SYMBOL(cpu_present_mask); |
| 538 | |
| 539 | static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly; |
| 540 | const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits); |
| 541 | EXPORT_SYMBOL(cpu_active_mask); |
Rusty Russell | 3fa4152 | 2008-12-30 09:05:16 +1030 | [diff] [blame] | 542 | |
| 543 | void set_cpu_possible(unsigned int cpu, bool possible) |
| 544 | { |
| 545 | if (possible) |
| 546 | cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits)); |
| 547 | else |
| 548 | cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits)); |
| 549 | } |
| 550 | |
| 551 | void set_cpu_present(unsigned int cpu, bool present) |
| 552 | { |
| 553 | if (present) |
| 554 | cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits)); |
| 555 | else |
| 556 | cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits)); |
| 557 | } |
| 558 | |
| 559 | void set_cpu_online(unsigned int cpu, bool online) |
| 560 | { |
| 561 | if (online) |
| 562 | cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits)); |
| 563 | else |
| 564 | cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits)); |
| 565 | } |
| 566 | |
| 567 | void set_cpu_active(unsigned int cpu, bool active) |
| 568 | { |
| 569 | if (active) |
| 570 | cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits)); |
| 571 | else |
| 572 | cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits)); |
| 573 | } |
| 574 | |
| 575 | void init_cpu_present(const struct cpumask *src) |
| 576 | { |
| 577 | cpumask_copy(to_cpumask(cpu_present_bits), src); |
| 578 | } |
| 579 | |
| 580 | void init_cpu_possible(const struct cpumask *src) |
| 581 | { |
| 582 | cpumask_copy(to_cpumask(cpu_possible_bits), src); |
| 583 | } |
| 584 | |
| 585 | void init_cpu_online(const struct cpumask *src) |
| 586 | { |
| 587 | cpumask_copy(to_cpumask(cpu_online_bits), src); |
| 588 | } |