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