xref: /linux/arch/s390/include/asm/smp.h (revision e7d759f31ca295d589f7420719c311870bb3166f)
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  */
7 #ifndef __ASM_SMP_H
8 #define __ASM_SMP_H
9 
10 #include <asm/sigp.h>
11 #include <asm/lowcore.h>
12 #include <asm/processor.h>
13 
14 #define raw_smp_processor_id()	(S390_lowcore.cpu_nr)
15 
16 extern struct mutex smp_cpu_state_mutex;
17 extern unsigned int smp_cpu_mt_shift;
18 extern unsigned int smp_cpu_mtid;
19 extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
20 extern cpumask_t cpu_setup_mask;
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 extern void smp_emergency_stop(void);
30 
31 extern int smp_find_processor_id(u16 address);
32 extern int smp_store_status(int cpu);
33 extern void smp_save_dump_ipl_cpu(void);
34 extern void smp_save_dump_secondary_cpus(void);
35 extern void smp_yield_cpu(int cpu);
36 extern void smp_cpu_set_polarization(int cpu, int val);
37 extern int smp_cpu_get_polarization(int cpu);
38 extern int smp_cpu_get_cpu_address(int cpu);
39 extern void smp_fill_possible_mask(void);
40 extern void smp_detect_cpus(void);
41 
42 static inline void smp_stop_cpu(void)
43 {
44 	u16 pcpu = stap();
45 
46 	for (;;) {
47 		__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
48 		cpu_relax();
49 	}
50 }
51 
52 /* Return thread 0 CPU number as base CPU */
53 static inline int smp_get_base_cpu(int cpu)
54 {
55 	return cpu - (cpu % (smp_cpu_mtid + 1));
56 }
57 
58 static inline void smp_cpus_done(unsigned int max_cpus)
59 {
60 }
61 
62 extern int smp_rescan_cpus(void);
63 extern void __noreturn cpu_die(void);
64 extern void __cpu_die(unsigned int cpu);
65 extern int __cpu_disable(void);
66 extern void schedule_mcck_handler(void);
67 void notrace smp_yield_cpu(int cpu);
68 
69 #endif /* __ASM_SMP_H */
70