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 */ 27 typedef struct 28 { 29 int intresting; 30 sigp_ccode ccode; 31 __u32 status; 32 __u16 cpu; 33 } sigp_info; 34 35 extern void machine_restart_smp(char *); 36 extern void machine_halt_smp(void); 37 extern 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 56 extern int __cpu_disable (void); 57 extern void __cpu_die (unsigned int cpu); 58 extern void cpu_die (void) __attribute__ ((noreturn)); 59 extern int __cpu_up (unsigned int cpu); 60 61 extern struct mutex smp_cpu_state_mutex; 62 extern int smp_cpu_polarization[]; 63 64 extern void arch_send_call_function_single_ipi(int cpu); 65 extern void arch_send_call_function_ipi(cpumask_t mask); 66 67 #endif 68 69 #ifdef CONFIG_HOTPLUG_CPU 70 extern int smp_rescan_cpus(void); 71 #else 72 static inline int smp_rescan_cpus(void) { return 0; } 73 #endif 74 75 extern union save_area *zfcpdump_save_areas[NR_CPUS + 1]; 76 #endif 77