include/linux/smp.h

   1 #ifndef __LINUX_SMP_H
   2 #define __LINUX_SMP_H
   3
   4 /*
   5  *      Generic SMP support
   6  *              Alan Cox. <alan@redhat.com>
   7  */
   8
   9
  10 extern void cpu_idle(void);
  11
  12 #ifdef CONFIG_SMP
  13
  14 #include <linux/preempt.h>
  15 #include <linux/kernel.h>
  16 #include <linux/compiler.h>
  17 #include <linux/thread_info.h>
  18 #include <asm/smp.h>
  19
  20 /*
  21  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
  22  * (defined in asm header):
  23  */
  24
  25 /*
  26  * stops all CPUs but the current one:
  27  */
  28 extern void smp_send_stop(void);
  29
  30 /*
  31  * sends a 'reschedule' event to another CPU:
  32  */
  33 extern void smp_send_reschedule(int cpu);
  34
  35
  36 /*
  37  * Prepare machine for booting other CPUs.
  38  */
  39 extern void smp_prepare_cpus(unsigned int max_cpus);
  40
  41 /*
  42  * Bring a CPU up
  43  */
  44 extern int __cpu_up(unsigned int cpunum);
  45
  46 /*
  47  * Final polishing of CPUs
  48  */
  49 extern void smp_cpus_done(unsigned int max_cpus);
  50
  51 /*
  52  * Call a function on all other processors
  53  */
  54 int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
  55
  56 int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
  57                                 int retry, int wait);
  58
  59 /*
  60  * Call a function on all processors
  61  */
  62 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
  63
  64 #define MSG_ALL_BUT_SELF        0x8000  /* Assume <32768 CPU's */
  65 #define MSG_ALL                 0x8001
  66
  67 #define MSG_INVALIDATE_TLB      0x0001  /* Remote processor TLB invalidate */
  68 #define MSG_STOP_CPU            0x0002  /* Sent to shut down slave CPU's
  69                                          * when rebooting
  70                                          */
  71 #define MSG_RESCHEDULE          0x0003  /* Reschedule request from master CPU*/
  72 #define MSG_CALL_FUNCTION       0x0004  /* Call function on all other CPUs */
  73
  74 /*
  75  * Mark the boot cpu "online" so that it can call console drivers in
  76  * printk() and can access its per-cpu storage.
  77  */
  78 void smp_prepare_boot_cpu(void);
  79
  80 #else /* !SMP */
  81
  82 /*
  83  *      These macros fold the SMP functionality into a single CPU system
  84  */
  85 #define raw_smp_processor_id()                  0
  86 #define hard_smp_processor_id()                 0
  87 static inline int up_smp_call_function(void)
  88 {
  89         return 0;
  90 }
  91 #define smp_call_function(func,info,retry,wait) (up_smp_call_function())
  92 #define on_each_cpu(func,info,retry,wait)       \
  93         ({                                      \
  94                 local_irq_disable();            \
  95                 func(info);                     \
  96                 local_irq_enable();             \
  97                 0;                              \
  98         })
  99 static inline void smp_send_reschedule(int cpu) { }
 100 #define num_booting_cpus()                      1
 101 #define smp_prepare_boot_cpu()                  do {} while (0)
 102
 103 #endif /* !SMP */
 104
 105 /*
 106  * smp_processor_id(): get the current CPU ID.
 107  *
 108  * if DEBUG_PREEMPT is enabled the we check whether it is
 109  * used in a preemption-safe way. (smp_processor_id() is safe
 110  * if it's used in a preemption-off critical section, or in
 111  * a thread that is bound to the current CPU.)
 112  *
 113  * NOTE: raw_smp_processor_id() is for internal use only
 114  * (smp_processor_id() is the preferred variant), but in rare
 115  * instances it might also be used to turn off false positives
 116  * (i.e. smp_processor_id() use that the debugging code reports but
 117  * which use for some reason is legal). Don't use this to hack around
 118  * the warning message, as your code might not work under PREEMPT.
 119  */
 120 #ifdef CONFIG_DEBUG_PREEMPT
 121   extern unsigned int debug_smp_processor_id(void);
 122 # define smp_processor_id() debug_smp_processor_id()
 123 #else
 124 # define smp_processor_id() raw_smp_processor_id()
 125 #endif
 126
 127 #define get_cpu()               ({ preempt_disable(); smp_processor_id(); })
 128 #define put_cpu()               preempt_enable()
 129 #define put_cpu_no_resched()    preempt_enable_no_resched()
 130
 131 void smp_setup_processor_id(void);
 132
 133 #endif /* __LINUX_SMP_H */