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 20 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle); 21 22 extern void arch_send_call_function_single_ipi(int cpu); 23 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 24 25 extern void smp_call_online_cpu(void (*func)(void *), void *); 26 extern void smp_call_ipl_cpu(void (*func)(void *), void *); 27 28 extern int smp_find_processor_id(u16 address); 29 extern int smp_store_status(int cpu); 30 extern int smp_vcpu_scheduled(int cpu); 31 extern void smp_yield_cpu(int cpu); 32 extern void smp_yield(void); 33 extern void smp_cpu_set_polarization(int cpu, int val); 34 extern int smp_cpu_get_polarization(int cpu); 35 extern void smp_fill_possible_mask(void); 36 37 #else /* CONFIG_SMP */ 38 39 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data) 40 { 41 func(data); 42 } 43 44 static inline void smp_call_online_cpu(void (*func)(void *), void *data) 45 { 46 func(data); 47 } 48 49 static inline int smp_find_processor_id(u16 address) { return 0; } 50 static inline int smp_store_status(int cpu) { return 0; } 51 static inline int smp_vcpu_scheduled(int cpu) { return 1; } 52 static inline void smp_yield_cpu(int cpu) { } 53 static inline void smp_yield(void) { } 54 static inline void smp_fill_possible_mask(void) { } 55 56 #endif /* CONFIG_SMP */ 57 58 static inline void smp_stop_cpu(void) 59 { 60 u16 pcpu = stap(); 61 62 for (;;) { 63 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL); 64 cpu_relax(); 65 } 66 } 67 68 #ifdef CONFIG_HOTPLUG_CPU 69 extern int smp_rescan_cpus(void); 70 extern void __noreturn cpu_die(void); 71 extern void __cpu_die(unsigned int cpu); 72 extern int __cpu_disable(void); 73 #else 74 static inline int smp_rescan_cpus(void) { return 0; } 75 static inline void cpu_die(void) { } 76 #endif 77 78 #endif /* __ASM_SMP_H */ 79