2 * include/asm-s390/smp.h
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)
13 #include <linux/threads.h>
14 #include <linux/cpumask.h>
15 #include <linux/bitops.h>
17 #if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
19 #include <asm/lowcore.h>
21 #include <asm/ptrace.h>
22 #include <asm/system.h>
25 s390 specific smp.c headers
35 extern void machine_restart_smp(char *);
36 extern void machine_halt_smp(void);
37 extern void machine_power_off_smp(void);
39 #define NO_PROC_ID 0xFF /* No processor magic marker */
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
51 #define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
53 #define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr)
55 static inline __u16 hard_smp_processor_id(void)
61 * returns 1 if cpu is in stopped/check stopped state or not operational
65 smp_cpu_not_running(int cpu)
69 switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
70 case sigp_order_code_accepted:
71 case sigp_status_stored:
72 /* Check for stopped and check stop state */
76 case sigp_not_operational:
84 #define cpu_logical_map(cpu) (cpu)
86 extern int __cpu_disable (void);
87 extern void __cpu_die (unsigned int cpu);
88 extern void cpu_die (void) __attribute__ ((noreturn));
89 extern int __cpu_up (unsigned int cpu);
91 extern struct mutex smp_cpu_state_mutex;
92 extern int smp_cpu_polarization[];
94 extern int smp_call_function_mask(cpumask_t mask, void (*func)(void *),
95 void *info, int wait);
99 static inline void smp_send_stop(void)
101 /* Disable all interrupts/machine checks */
102 __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
105 #define hard_smp_processor_id() 0
106 #define smp_cpu_not_running(cpu) 1
109 #ifdef CONFIG_HOTPLUG_CPU
110 extern int smp_rescan_cpus(void);
112 static inline int smp_rescan_cpus(void) { return 0; }
115 extern union save_area *zfcpdump_save_areas[NR_CPUS + 1];