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 int smp_vcpu_scheduled(int cpu); 33 extern void smp_yield_cpu(int cpu); 34 extern void smp_cpu_set_polarization(int cpu, int val); 35 extern int smp_cpu_get_polarization(int cpu); 36 extern void smp_fill_possible_mask(void); 37 38 #else /* CONFIG_SMP */ 39 40 #define smp_cpu_mtid 0 41 42 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data) 43 { 44 func(data); 45 } 46 47 static inline void smp_call_online_cpu(void (*func)(void *), void *data) 48 { 49 func(data); 50 } 51 52 static inline int smp_find_processor_id(u16 address) { return 0; } 53 static inline int smp_store_status(int cpu) { return 0; } 54 static inline int smp_vcpu_scheduled(int cpu) { return 1; } 55 static inline void smp_yield_cpu(int cpu) { } 56 static inline void smp_fill_possible_mask(void) { } 57 58 #endif /* CONFIG_SMP */ 59 60 static inline void smp_stop_cpu(void) 61 { 62 u16 pcpu = stap(); 63 64 for (;;) { 65 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL); 66 cpu_relax(); 67 } 68 } 69 70 #ifdef CONFIG_HOTPLUG_CPU 71 extern int smp_rescan_cpus(void); 72 extern void __noreturn cpu_die(void); 73 extern void __cpu_die(unsigned int cpu); 74 extern int __cpu_disable(void); 75 #else 76 static inline int smp_rescan_cpus(void) { return 0; } 77 static inline void cpu_die(void) { } 78 #endif 79 80 #endif /* __ASM_SMP_H */ 81