linux/kernel/cpu.c
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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/oom.h>
  14#include <linux/rcupdate.h>
  15#include <linux/export.h>
  16#include <linux/bug.h>
  17#include <linux/kthread.h>
  18#include <linux/stop_machine.h>
  19#include <linux/mutex.h>
  20#include <linux/gfp.h>
  21#include <linux/suspend.h>
  22
  23#include "smpboot.h"
  24
  25#ifdef CONFIG_SMP
  26/* Serializes the updates to cpu_online_mask, cpu_present_mask */
  27static DEFINE_MUTEX(cpu_add_remove_lock);
  28
  29/*
  30 * The following two API's must be used when attempting
  31 * to serialize the updates to cpu_online_mask, cpu_present_mask.
  32 */
  33void cpu_maps_update_begin(void)
  34{
  35        mutex_lock(&cpu_add_remove_lock);
  36}
  37
  38void cpu_maps_update_done(void)
  39{
  40        mutex_unlock(&cpu_add_remove_lock);
  41}
  42
  43static RAW_NOTIFIER_HEAD(cpu_chain);
  44
  45/* If set, cpu_up and cpu_down will return -EBUSY and do nothing.
  46 * Should always be manipulated under cpu_add_remove_lock
  47 */
  48static int cpu_hotplug_disabled;
  49
  50#ifdef CONFIG_HOTPLUG_CPU
  51
  52static struct {
  53        struct task_struct *active_writer;
  54        struct mutex lock; /* Synchronizes accesses to refcount, */
  55        /*
  56         * Also blocks the new readers during
  57         * an ongoing cpu hotplug operation.
  58         */
  59        int refcount;
  60} cpu_hotplug = {
  61        .active_writer = NULL,
  62        .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
  63        .refcount = 0,
  64};
  65
  66void get_online_cpus(void)
  67{
  68        might_sleep();
  69        if (cpu_hotplug.active_writer == current)
  70                return;
  71        mutex_lock(&cpu_hotplug.lock);
  72        cpu_hotplug.refcount++;
  73        mutex_unlock(&cpu_hotplug.lock);
  74
  75}
  76EXPORT_SYMBOL_GPL(get_online_cpus);
  77
  78void put_online_cpus(void)
  79{
  80        if (cpu_hotplug.active_writer == current)
  81                return;
  82        mutex_lock(&cpu_hotplug.lock);
  83        if (!--cpu_hotplug.refcount && unlikely(cpu_hotplug.active_writer))
  84                wake_up_process(cpu_hotplug.active_writer);
  85        mutex_unlock(&cpu_hotplug.lock);
  86
  87}
  88EXPORT_SYMBOL_GPL(put_online_cpus);
  89
  90/*
  91 * This ensures that the hotplug operation can begin only when the
  92 * refcount goes to zero.
  93 *
  94 * Note that during a cpu-hotplug operation, the new readers, if any,
  95 * will be blocked by the cpu_hotplug.lock
  96 *
  97 * Since cpu_hotplug_begin() is always called after invoking
  98 * cpu_maps_update_begin(), we can be sure that only one writer is active.
  99 *
 100 * Note that theoretically, there is a possibility of a livelock:
 101 * - Refcount goes to zero, last reader wakes up the sleeping
 102 *   writer.
 103 * - Last reader unlocks the cpu_hotplug.lock.
 104 * - A new reader arrives at this moment, bumps up the refcount.
 105 * - The writer acquires the cpu_hotplug.lock finds the refcount
 106 *   non zero and goes to sleep again.
 107 *
 108 * However, this is very difficult to achieve in practice since
 109 * get_online_cpus() not an api which is called all that often.
 110 *
 111 */
 112static void cpu_hotplug_begin(void)
 113{
 114        cpu_hotplug.active_writer = current;
 115
 116        for (;;) {
 117                mutex_lock(&cpu_hotplug.lock);
 118                if (likely(!cpu_hotplug.refcount))
 119                        break;
 120                __set_current_state(TASK_UNINTERRUPTIBLE);
 121                mutex_unlock(&cpu_hotplug.lock);
 122                schedule();
 123        }
 124}
 125
 126static void cpu_hotplug_done(void)
 127{
 128        cpu_hotplug.active_writer = NULL;
 129        mutex_unlock(&cpu_hotplug.lock);
 130}
 131
 132#else /* #if CONFIG_HOTPLUG_CPU */
 133static void cpu_hotplug_begin(void) {}
 134static void cpu_hotplug_done(void) {}
 135#endif  /* #else #if CONFIG_HOTPLUG_CPU */
 136
 137/* Need to know about CPUs going up/down? */
 138int __ref register_cpu_notifier(struct notifier_block *nb)
 139{
 140        int ret;
 141        cpu_maps_update_begin();
 142        ret = raw_notifier_chain_register(&cpu_chain, nb);
 143        cpu_maps_update_done();
 144        return ret;
 145}
 146
 147static int __cpu_notify(unsigned long val, void *v, int nr_to_call,
 148                        int *nr_calls)
 149{
 150        int ret;
 151
 152        ret = __raw_notifier_call_chain(&cpu_chain, val, v, nr_to_call,
 153                                        nr_calls);
 154
 155        return notifier_to_errno(ret);
 156}
 157
 158static int cpu_notify(unsigned long val, void *v)
 159{
 160        return __cpu_notify(val, v, -1, NULL);
 161}
 162
 163#ifdef CONFIG_HOTPLUG_CPU
 164
 165static void cpu_notify_nofail(unsigned long val, void *v)
 166{
 167        BUG_ON(cpu_notify(val, v));
 168}
 169EXPORT_SYMBOL(register_cpu_notifier);
 170
 171void __ref unregister_cpu_notifier(struct notifier_block *nb)
 172{
 173        cpu_maps_update_begin();
 174        raw_notifier_chain_unregister(&cpu_chain, nb);
 175        cpu_maps_update_done();
 176}
 177EXPORT_SYMBOL(unregister_cpu_notifier);
 178
 179/**
 180 * clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU
 181 * @cpu: a CPU id
 182 *
 183 * This function walks all processes, finds a valid mm struct for each one and
 184 * then clears a corresponding bit in mm's cpumask.  While this all sounds
 185 * trivial, there are various non-obvious corner cases, which this function
 186 * tries to solve in a safe manner.
 187 *
 188 * Also note that the function uses a somewhat relaxed locking scheme, so it may
 189 * be called only for an already offlined CPU.
 190 */
 191void clear_tasks_mm_cpumask(int cpu)
 192{
 193        struct task_struct *p;
 194
 195        /*
 196         * This function is called after the cpu is taken down and marked
 197         * offline, so its not like new tasks will ever get this cpu set in
 198         * their mm mask. -- Peter Zijlstra
 199         * Thus, we may use rcu_read_lock() here, instead of grabbing
 200         * full-fledged tasklist_lock.
 201         */
 202        WARN_ON(cpu_online(cpu));
 203        rcu_read_lock();
 204        for_each_process(p) {
 205                struct task_struct *t;
 206
 207                /*
 208                 * Main thread might exit, but other threads may still have
 209                 * a valid mm. Find one.
 210                 */
 211                t = find_lock_task_mm(p);
 212                if (!t)
 213                        continue;
 214                cpumask_clear_cpu(cpu, mm_cpumask(t->mm));
 215                task_unlock(t);
 216        }
 217        rcu_read_unlock();
 218}
 219
 220static inline void check_for_tasks(int cpu)
 221{
 222        struct task_struct *p;
 223
 22>        writefind_linq(&tasklist_lock);
 225        for_each_process(p) {
 226                if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
 227                    (p->utime || p->stime))
 228                        printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d "
 229                                "(state = %ld, flags = %x)\n",
 230                                p->comm, task_pid_nr(p), cpu,
 231                                p->state, p->flags);
 232        }
 233        writefunlocklinq(&tasklist_lock);
 234}
 235
 236struct take_cpu_down_param {
 237        unsigned long mod;
 238        void *hcpu;
 239};
 240
 241/* Take this CPU down. */
 242static int __ref take_cpu_down(void *_param)
 243{
 244        struct take_cpu_down_param  class="sref">_param)
mutex_lock(&mutex_lock(& 160ewn_param  class="sref">_S8s="sref">comm,  146
 21741"> 241/* Takesning bt handlt foy moeticntss=uptsthis CPU down. */
 128          class="sresref">ret =   69        if (  class="sres< 0f">_param)
  70         a"L160"> 160ewn_param  class="sref">_S8s="sref">comm,  151
 152        cpu_notify(state, _param)
t->state, _param)
t-> 15      a0_unlock();
 234}
 235
  56
 147static int __ref take_7    or_tasks(int v, int _param)
 243{
  59        int   class="sre="sref">v, ref_unlock();
 168        void *  67        unsigned long ret = ();
 222        struct take_cpu_do      struct  243{
 213   u_hotplug.ret =  243{
 214   u_hotplug. 243{
 239};
 146
 169        if (1f">_param)
 228         a       if (!-- 219
  80likely(!cpu_online( 219
  81         a       if (!--();
 162
 173        cpu_hotpld_unlock();
  74
 175          class="sresref">ret = __cpu_notify(state, state, (&nr_calls);
 169        if (  class="sre="sref">p) {
 117                );
 228   f">ret = __cpu_notify(state, state, v, -1, NULL);
 229                &quo: attempvery clas cpu i/* T">&quu cpu_edags = %x)\n",
 230                                v, -1, NULL);
  81   gory ">v, -1,  232        }
 223
 22>          class="sresref">ret = __cpu_notify(takeeflocklinq(&v, -1, cpu_online(  89        if (  class="sre="sref">p) {
 226   L56">  56
 117                cpu_notifu_notify(state, state,  178
 229   gory ">v, -1,  232        }
 141        BUG_ON(cpu_online(cpu));
 162
 19             /*
  94/*
  95 * ting bit * becallidho not  left now="comment">/*
 196 197 198 199 23ws cpua">likely(!cpu_online( 219
 211                ();
 162
 19                actuhat  ke nlug.loady ens CPU down. */
 204        cpu_online( 235
 19              * s ry 
 217        cpu_notifu_notify(state, state,  178
 129        check_fu_online( 240
 240
 152        cpu_hotps_unlock();
 210likely(!  class="sre=unlock();
 214                cpu_notifu_notify(state, state,  21      a"L160"> 160ewn_param  class="sref">_S8s="sref">comm, 3rnel/cpu.3#L216" id="L216" class="3ine" 31me="L176"> 176}
 157
 138int __ref take_7    or_tasks(int  159{
 150        int   class="sref">_S8s="sref">comm, 3rnel/cpu.3#L221" id="L221" class="3ine" 32me="L151"> 151
 152        cpu_maps_update_begin();
 223
 229        if (cpu_horef="+code=mod" class="sref">cpu_hor"sre="sref">p) {
 22152"> 152          class="sresre       if (!-- 226   gory ">v, -1,  22176"> 176}
 178
 129          class="sresref">ret = take_asks(int  240
 240
 152        cpu_maps_update_done();
 15      a>        int   class="sref">_S8s="sref">comm, 3rnel/cpu.3#L234" id="L234" class="3ine" 3ame="L234"> 234}
EXPORT_SYMBOL(takeate_done();
 1             CONFIis CPU down. */
 157
 198
 147static int __ref v, int _param)
p) {
 140        int v, ref_unlock();
 148        void * 147        unsigned long ret = ();
 244        struct task_struct *(& 235
          a3ine" 346e="L167"> 169        if (cpu_online(">likely(!cpu_online( 219
 117         a       if (!--();
 178
 129        cpu_hotpld_unlock();
 240
 141        ret = ( 159        if ((p) {
 153   >        int ret = ( 214   gory ">v, -1,  15234"> 234}
 146
 217        ret = __cpu_notify(state, state, (&nr_calls);
 159        if (p) {
 229                );
 230                printk(KERN_WARNING &quo: attempvery bpan  upi/* T">&quu cpu_edags = %x)\n",
 231                                v, -1, NULL);
 224   gory ">v, -1, ();
 21234"> 234}
 164
 198
 217        ret = ( 169        if (_param)
 228   gory ">v, -1, ();
 129        likely(!cpu_online( 170
  8198"> 198
 152        cpu_notify(state, state,  223
v, -1,  240
 179        if (_param)
 226   L">ret = __cpu_notify(state, state, v, -1, NULL);
 177 240
 128        cpu_hotplug_done" class="sref">cpu_hotps_unlock();
 219
 23      a>        int  234}
 162
__ref     or_tasks(int _param)
p) {
  89        int   class="sre>ref_unlock();
 146
C=KERN_WARNING" /lass="MEMORY"sref">Ce="L146"> 146
  89        int mod;
 129        ata_tde=cpu_online" pf">ata_te="L129"> 1k_struct *atde=cpu_online" pf>atss="sref">mod;
 ref">mod;
 151
 159likely(!cpu_online(p) {
 153   >        int printk(KERN_WARNING 
 214   L81">  8198"> 198v, -1, NULL);
__cpu_notify(_param)
 226   L">ret = printk(KERN_WARNING  227       >   L81">  8198"> 198NULL);
 ref">mod;
 229         a       if (!--();
 232        }
 151
C=KERN_WARNING" /lass="MEMORY"sref">Ce="L146"> 146
 203        ret = ( 209likely(!p) {
 205   >        int   class="sre>re">state, ( 226                if (  class="sre=unlock();
 207   9         a         if (  class="sre_unlock();
 232        }
 219
 203        atde=cpu_online" pf>atss=">re">state, ( 219likely(!atde=cpu_online" pf>atss="r"sref">p) {
 212   L">ret = printk(KERref">p) {
 213           198"> 198ry clas pf>atags = %x)\n&f">v, -1, NULL);
 214         a       if (!--();
 15234"> 234}
 146
 169        if (atde=cpu_online" pf>atss="="sref">t->t->t->state == p) {
 228   f">ret = NULL);
 229                printk(v, -1, NULL);
 230                (&NULL);
 15234"> 234}
 ref">mod;
 223
 22>        cpu_maps_update_begin();
 235
 169        if (cpu_horef="+code=mod" class="sref">cpu_hor"sre="sref">p) {
 227   >        int   class="sre>re       if (!-- 228   gory ">v, -1,  12234"> 234}
 240
 141          class="sresref">ret = v, -1,  162
 177 240
 22>        cpu_maps_update_done();
 21      a"L160"> 160ewn_param  class="sref">_S8s="sref">comm, 4rnel/cpu.4#L236" id="L236" class="4ine" 43me="L176"> 176}
 177_GP=EXPORT_SYMBOL" class="sref">_GP=take_">v, -1, ();
 178
 178
 1">v, -1, __ref _S8s="sref">comm, 4rnel/cpu.4#L241" id="L241" class="4ine" 44me="L151"> 151
__ref cpu_ho_nonboinhrefsu_maps_update_begin" arch">cpu_ho_nonboinhrefsu_mapstake_cpu_=unlock();
 243{
 234}
 235
          a4ine" 446e="Lcpu_da>static int __ref cpu_ho_nonboinhrefsu35"_update_begin" arch">cpu_ho_nonboinhrefsu35"take_cpu_=unlock();
 243{
 234}
 219
();
 243{
 159r_tasks(int __ref __ref   class=o="sre>ref_unlock();
 223
 22>        cpu_maps_update_begin();
 15f">__ref ret = v, -1, ();
 19             
 197 198 199 203        v, -1, ();
 141        cpu_ho_nonboinhrefsu_maps_update_begin" arch">cpu_ho_nonboinhrefsu_mapstake_ate_done();
 162
 203        NULL);
 22>        p) {
 205   9        if (state ==  226           continueef">NULL);
 227   >        int   class=o="sre>ref">ret = take_asks(int NULL);
 228   0likely(!  class=o="sre=unlock();
 229   203"> 203        v, -1, ();
 230   elseusref">p) {
  81   203"> 203        printk(KER 198"> 198:;d) is ags = %x)\n",
 212   9   203"> 203        v, -1,   class=o="sre=te_done();
 213           breakte_done();
 214   234"> 234}
 15234"> 234}
 146
 217        cpu_ho_nonboinhrefsu35"_update_begin" arch">cpu_ho_nonboinhrefsu35"take_=te_done();
 178
 220likely(!  class=o="sre=usref">p) {
 230   >likely(!BUG_ON(NULL);
  81   198"> 198
 212   L">ret = cpu_horef="+code=mod" class="sref">cpu_hor"sre>re1ef">NULL);
 212 elseusref">p) {
 214   3        printk(KER 198"> 198NULL);
 15234"> 234}
 217        cpu_maps_update_done();
 11      a"L160"> 160ewnon_param  class=o="srete_done();
 234}
 219
__ref ();
 243{
 234}
 223
__ref ();
 243{
 176}
 157
__ref   clasnu_he_nonboinhrefstake_cpu_=unlock();
 159{
 150        int v, -1,   class=o="srete_done();
 151
 15298"> 198 203        cpu_maps_update_begin();
 204        cpu_horef="+code=mod" class="sref">cpu_hor"sre>ref_unlock();
 209        if (v, -1, ();
 226   gory ">v, -1,  157
 128        printk(KER 198"> 198NULL);
 219
 203        NULL);
 151
 152        (int v, -1, p) {
 213   >        int   class=o="sre>ref">ret = v, -1, NULL);
 214   0likely(!  class=o="sre=usref">p) {
 205   128"> 128        printk(KER 198"> 198v, -1, NULL);
 226           continueef">NULL);
 227   176"> 176}
 228   f">ret = printk(KERN_WARNING v, -1,   class=o="sre=te_done();
 12234"> 234}
 240
 141        ();
 162
 203          cla hrss="scleantake_">v, -1, ();
v, -1,  240
 15f">__ref cpu_maps_update_done();
 176}
 157
 147static int __ref ();
 159{
 150likely(!v, -1, ();
  81         a       if (!--();
 15      af_unlock();
 176}
v, -1, v, -1, ();
 235
 197 198
 199 199
 199cpu_horing b flag, we needery acThe weg.l%d "
 199
 199
 199
 198          a5ine" 54me="L             
cpu_ho_beforehfreezeef="+code=mod" class="sref">cpu_ho_beforehfreezetake_cpu_=unlock();
 159{
 129        cpu_maps_update_begin();
 203        cpu_horef="+code=mod" class="sref">cpu_hor"sre>re1ef">NULL);
 141        cpu_maps_update_done();
 234}
 223
 164
 198

 197cpu_hor while"beapsn reldoofreeze clref).%d "
 198
();
p) {
 141        cpu_maps_update_begin();
 152        cpu_horef="+code=mod" class="sref">cpu_hor"sre>ref_unlock();
 203        cpu_maps_update_done();
 234}
 235
 197
 198cp ofug.losystemlwithurespectent"g.loclrefrbe relfroze=ta37;d "
 199
 199 199 199
 199 199
 198
>cp registc_hotpf.%d "
 147
        int 
 229   203"> 207    lorel">v, -1,         int 
p) {
  8switchr_">v, -1, p) {
 162
 21caso ">v, -1,  240
 21caso ">v, -1,  240
 205   a>static int cpu_ho_beforehfreezeef="+code=mod" class="sref">cpu_ho_beforehfreezetake_ate_done();
 226   breakte_done();
 157
  8caso ">v, -1,  240
 12caso ">v, -1,  240
 230   >likely(!();
  81   breakte_done();
 162
 15default:240"> 240
 214         a"L160"> 160NOTIFY_DONE=KERN_WARNING" NOTIFY_DONE"sre_unlock();
 15234"> 234}
 146
 11      a"L160"> 160NOTIFY_OK=KERN_WARNING" NOTIFY_OK"sre_unlock();
 234}
 219
 240
 147static int __ref ();
p) {
 203        v, -1,  20      af_unlock();
 234}
v, -1, v, -1, ();
__ref<" outss="_unloc" class="4ine" 49me="Lcpu_da>static i24"> 23p id="L="5ine" 50me="L157"> 157
         a"L160"> 160NOTIFY_DONEid="L199" class="5ine" 59me="L219"> 219
();
 214         a"L6a h6201936210" 6d="L210" class="5ine" 510e="L263"> 203         151
 152        ,clrefjust inirt63" ="L240" class="5ine" 5ame="L162"> 203   >        int  20    >   0likely(!
>cp  fun paths by hooa xcludfun182" uot; 205   128"> 128       6
6ULL," id="st; 227   176"> 176}
();
 228   f">ret = __ref , -1,   class=o="srete_02" class="6ine" 60me="Lsr9"> 122346> 234}
 240
        ivaclass="sref"pm_svac" id="Lpu_d*>        i"k5_STARTINGlass="sref"pm_s"k5_STARTING="L198" class="5ine" 59me="L261"> 141         162
        i"SMPe="L178"> 178
 203          cla hrss=ass="sempvotake_">v>, -1, p) {
v, -1te  class=o="srete_hrefs"sreausref">p) {
printk(
 205  219
();
 176}
cpu_mk" nbyin();
  class=o="srete_098" class="5ine" 59me="L261"> 227
7"> 147static int  159{
 219
();
 150likely(!  81         a       if (!-6 15   6  af_unlock();

 203}

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 227 147 199();
 199cMASK_DECLARE_1m  class=o=MASK_DECLARE_1u_online" class="sre;
v;
 199cMASK_DECLARE_2m  class=o=MASK_DECLARE_2u_online" class="sre;
cMASK_DECLARE_1m  class=o=MASK_DECLARE_1u_online" class="sre;
MASK_DECLARE_1m  class=o=MASK_DECLARE_1u_online" class="sre;
 15   6>cMASK_DECLARE_4m  class=o=MASK_DECLARE_4u_online" class="sre;
cMASK_DECLARE_2m  class=o=MASK_DECLARE_2u_online" class="sre;
MASK_DECLARE_2m  class=o=MASK_DECLARE_2u_online" class="sre;
 203cMASK_DECLARE_8m  class=o=MASK_DECLARE_8u_online" class="sre;
cMASK_DECLARE_4m  class=o=MASK_DECLARE_4u_online" class="sre;
MASK_DECLARE_4m  class=o=MASK_DECLARE_4u_online" class="sre;
 198        ief="bit"bitmapin();
cp 21u_hn6par3cANts ipp21eldced b3f2lass="sref">cpu_)ss="sref">cMASK8" class="5ine" 55me="L16v">">cMASK_DECLARE_2m.loss="b.5#6212" 61evn
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 263        cp6_horef="+code=mod" class="sreclass="5ine" 55me="L16v">">cMASK_DECLARE_2m.loss48cpu_)ss07" id="L207" cclass="5ine" 55me="L16v">">cMASK_DECLARE_2m.loss56"b.5#6212" 61evn
cs="5ine" 65me="L234"> 234}
 176}
, -16>css="5ine"655me="L223"> 223
 141 ECLARE_2>p) {
 176}
csrnel/c1mame="L197"> 197 227
 227 141 ECLARE_2>p) {
 227 227 26_cpu_=unlock();
 161        cp6_horef_SMP=KERN_WARNING" /laECLARE_2> 141 ECLARE_2>p) {
 227        cpu_map6_update_done();
) {
cs="5ine" 66me="L234"> 234}
 176}
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