arch/s390/include/asm/smp.h

   1 /*
   2  *    Copyright IBM Corp. 1999, 2012
   3  *    Author(s): Denis Joseph Barrow,
   4  *               Martin Schwidefsky <schwidefsky@de.ibm.com>,
   5  *               Heiko Carstens <heiko.carstens@de.ibm.com>,
   6  */
   7 #ifndef __ASM_SMP_H
   8 #define __ASM_SMP_H
   9
  10 #include <asm/sigp.h>
  11
  12 #ifdef CONFIG_SMP
  13
  14 #include <asm/lowcore.h>
  15
  16 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  17
  18 extern struct mutex smp_cpu_state_mutex;
  19 extern unsigned int smp_cpu_mt_shift;
  20 extern unsigned int smp_cpu_mtid;
  21
  22 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
  23
  24 extern void arch_send_call_function_single_ipi(int cpu);
  25 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  26
  27 extern void smp_call_online_cpu(void (*func)(void *), void *);
  28 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
  29
  30 extern int smp_find_processor_id(u16 address);
  31 extern int smp_store_status(int cpu);
  32 extern void smp_save_dump_cpus(void);
  33 extern int smp_vcpu_scheduled(int cpu);
  34 extern void smp_yield_cpu(int cpu);
  35 extern void smp_cpu_set_polarization(int cpu, int val);
  36 extern int smp_cpu_get_polarization(int cpu);
  37 extern void smp_fill_possible_mask(void);
  38
  39 #else /* CONFIG_SMP */
  40
  41 #define smp_cpu_mtid    0
  42
  43 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
  44 {
  45         func(data);
  46 }
  47
  48 static inline void smp_call_online_cpu(void (*func)(void *), void *data)
  49 {
  50         func(data);
  51 }
  52
  53 static inline int smp_find_processor_id(u16 address) { return 0; }
  54 static inline int smp_store_status(int cpu) { return 0; }
  55 static inline int smp_vcpu_scheduled(int cpu) { return 1; }
  56 static inline void smp_yield_cpu(int cpu) { }
  57 static inline void smp_fill_possible_mask(void) { }
  58 static inline void smp_save_dump_cpus(void) { }
  59
  60 #endif /* CONFIG_SMP */
  61
  62 static inline void smp_stop_cpu(void)
  63 {
  64         u16 pcpu = stap();
  65
  66         for (;;) {
  67                 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
  68                 cpu_relax();
  69         }
  70 }
  71
  72 #ifdef CONFIG_HOTPLUG_CPU
  73 extern int smp_rescan_cpus(void);
  74 extern void __noreturn cpu_die(void);
  75 extern void __cpu_die(unsigned int cpu);
  76 extern int __cpu_disable(void);
  77 #else
  78 static inline int smp_rescan_cpus(void) { return 0; }
  79 static inline void cpu_die(void) { }
  80 #endif
  81
  82 #endif /* __ASM_SMP_H */