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/arch/s390/include/asm/smp.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 78 lines | 50 code | 17 blank | 11 comment | 2 complexity | 9292b5b423b27bf1899a261e1926aead MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 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 */