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1/*
2 * include/asm-s390/smp.h
3 *
4 * S390 version
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Heiko Carstens (heiko.carstens@de.ibm.com)
9 */
10#ifndef __ASM_SMP_H
11#define __ASM_SMP_H
12
13#include <linux/threads.h>
14#include <linux/cpumask.h>
15#include <linux/bitops.h>
16
17#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
18
19#include <asm/lowcore.h>
20#include <asm/sigp.h>
21#include <asm/ptrace.h>
22#include <asm/system.h>
23
24/*
25 s390 specific smp.c headers
26 */
27typedef struct
28{
29 int intresting;
30 sigp_ccode ccode;
31 __u32 status;
32 __u16 cpu;
33} sigp_info;
34
35extern void machine_restart_smp(char *);
36extern void machine_halt_smp(void);
37extern void machine_power_off_smp(void);
38
39#define NO_PROC_ID 0xFF /* No processor magic marker */
40
41/*
42 * This magic constant controls our willingness to transfer
43 * a process across CPUs. Such a transfer incurs misses on the L1
44 * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
45 * gut feeling is this will vary by board in value. For a board
46 * with separate L2 cache it probably depends also on the RSS, and
47 * for a board with shared L2 cache it ought to decay fast as other
48 * processes are run.
49 */
50
51#define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
52
53#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
54#define cpu_logical_map(cpu) (cpu)
55
56extern int __cpu_disable (void);
57extern void __cpu_die (unsigned int cpu);
58extern void cpu_die (void) __attribute__ ((noreturn));
59extern int __cpu_up (unsigned int cpu);
60
61extern struct mutex smp_cpu_state_mutex;
62extern int smp_cpu_polarization[];
63
64extern void arch_send_call_function_single_ipi(int cpu);
65extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
66
67#endif
68
69#ifdef CONFIG_HOTPLUG_CPU
70extern int smp_rescan_cpus(void);
71#else
72static inline int smp_rescan_cpus(void) { return 0; }
73#endif
74
75extern union save_area *zfcpdump_save_areas[NR_CPUS + 1];
76#endif