1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright IBM Corp. 1999, 2012 4 * Author(s): Denis Joseph Barrow, 5 * Martin Schwidefsky <schwidefsky@de.ibm.com>, 6 * Heiko Carstens <heiko.carstens@de.ibm.com>, 7 */ 8 #ifndef __ASM_SMP_H 9 #define __ASM_SMP_H 10 11 #include <asm/sigp.h> 12 13 #ifdef CONFIG_SMP 14 15 #include <asm/lowcore.h> 16 17 #define raw_smp_processor_id() (S390_lowcore.cpu_nr) 18 19 extern struct mutex smp_cpu_state_mutex; 20 extern unsigned int smp_cpu_mt_shift; 21 extern unsigned int smp_cpu_mtid; 22 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS]; 23 24 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle); 25 26 extern void arch_send_call_function_single_ipi(int cpu); 27 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 28 29 extern void smp_call_online_cpu(void (*func)(void *), void *); 30 extern void smp_call_ipl_cpu(void (*func)(void *), void *); 31 extern void smp_emergency_stop(void); 32 33 extern int smp_find_processor_id(u16 address); 34 extern int smp_store_status(int cpu); 35 extern void smp_save_dump_cpus(void); 36 extern int smp_vcpu_scheduled(int cpu); 37 extern void smp_yield_cpu(int cpu); 38 extern void smp_cpu_set_polarization(int cpu, int val); 39 extern int smp_cpu_get_polarization(int cpu); 40 extern void smp_fill_possible_mask(void); 41 extern void smp_detect_cpus(void); 42 43 #else /* CONFIG_SMP */ 44 45 #define smp_cpu_mtid 0 46 47 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data) 48 { 49 func(data); 50 } 51 52 static inline void smp_call_online_cpu(void (*func)(void *), void *data) 53 { 54 func(data); 55 } 56 57 static inline void smp_emergency_stop(void) 58 { 59 } 60 61 static inline int smp_find_processor_id(u16 address) { return 0; } 62 static inline int smp_store_status(int cpu) { return 0; } 63 static inline int smp_vcpu_scheduled(int cpu) { return 1; } 64 static inline void smp_yield_cpu(int cpu) { } 65 static inline void smp_fill_possible_mask(void) { } 66 static inline void smp_detect_cpus(void) { } 67 68 #endif /* CONFIG_SMP */ 69 70 static inline void smp_stop_cpu(void) 71 { 72 u16 pcpu = stap(); 73 74 for (;;) { 75 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL); 76 cpu_relax(); 77 } 78 } 79 80 /* Return thread 0 CPU number as base CPU */ 81 static inline int smp_get_base_cpu(int cpu) 82 { 83 return cpu - (cpu % (smp_cpu_mtid + 1)); 84 } 85 86 #ifdef CONFIG_HOTPLUG_CPU 87 extern int smp_rescan_cpus(void); 88 extern void __noreturn cpu_die(void); 89 extern void __cpu_die(unsigned int cpu); 90 extern int __cpu_disable(void); 91 #else 92 static inline int smp_rescan_cpus(void) { return 0; } 93 static inline void cpu_die(void) { } 94 #endif 95 96 #endif /* __ASM_SMP_H */ 97