arch/s390/include/asm/smp.h

   1 /*
   2  *    Copyright IBM Corp. 1999,2009
   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 #ifdef CONFIG_SMP
  11
  12 #include <asm/system.h>
  13 #include <asm/sigp.h>
  14
  15 extern void machine_restart_smp(char *);
  16 extern void machine_halt_smp(void);
  17 extern void machine_power_off_smp(void);
  18
  19 #define raw_smp_processor_id()  (S390_lowcore.cpu_nr)
  20
  21 extern int __cpu_disable (void);
  22 extern void __cpu_die (unsigned int cpu);
  23 extern int __cpu_up (unsigned int cpu);
  24
  25 extern struct mutex smp_cpu_state_mutex;
  26
  27 extern void arch_send_call_function_single_ipi(int cpu);
  28 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  29
  30 extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
  31
  32 extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
  33 extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
  34                               int from, int to);
  35 extern void smp_restart_with_online_cpu(void);
  36 extern void smp_restart_cpu(void);
  37
  38 /*
  39  * returns 1 if (virtual) cpu is scheduled
  40  * returns 0 otherwise
  41  */
  42 static inline int smp_vcpu_scheduled(int cpu)
  43 {
  44         u32 status;
  45
  46         switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) {
  47         case sigp_status_stored:
  48                 /* Check for running status */
  49                 if (status & 0x400)
  50                         return 0;
  51                 break;
  52         case sigp_not_operational:
  53                 return 0;
  54         default:
  55                 break;
  56         }
  57         return 1;
  58 }
  59
  60 #else /* CONFIG_SMP */
  61
  62 static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
  63 {
  64         func(data);
  65 }
  66
  67 static inline void smp_restart_with_online_cpu(void)
  68 {
  69 }
  70
  71 #define smp_vcpu_scheduled      (1)
  72
  73 #endif /* CONFIG_SMP */
  74
  75 #ifdef CONFIG_HOTPLUG_CPU
  76 extern int smp_rescan_cpus(void);
  77 extern void __noreturn cpu_die(void);
  78 #else
  79 static inline int smp_rescan_cpus(void) { return 0; }
  80 static inline void cpu_die(void) { }
  81 #endif
  82
  83 #endif /* __ASM_SMP_H */