/* * include/asm-s390/smp.h * * S390 version * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * Heiko Carstens (heiko.carstens@de.ibm.com) */ #ifndef __ASM_SMP_H #define __ASM_SMP_H #include <linux/threads.h> #include <linux/cpumask.h> #include <linux/bitops.h> #if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__) #include <asm/lowcore.h> #include <asm/sigp.h> /* s390 specific smp.c headers */ typedef struct { int intresting; sigp_ccode ccode; __u32 status; __u16 cpu; } sigp_info; extern void smp_setup_cpu_possible_map(void); extern int smp_call_function_on(void (*func) (void *info), void *info, int nonatomic, int wait, int cpu); #define NO_PROC_ID 0xFF /* No processor magic marker */ /* * This magic constant controls our willingness to transfer * a process across CPUs. Such a transfer incurs misses on the L1 * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My * gut feeling is this will vary by board in value. For a board * with separate L2 cache it probably depends also on the RSS, and * for a board with shared L2 cache it ought to decay fast as other * processes are run. */ #define PROC_CHANGE_PENALTY 20 /* Schedule penalty */ #define raw_smp_processor_id() (S390_lowcore.cpu_data.cpu_nr) extern int smp_get_cpu(cpumask_t cpu_map); extern void smp_put_cpu(int cpu); static inline __u16 hard_smp_processor_id(void) { __u16 cpu_address; asm volatile("stap %0" : "=m" (cpu_address)); return cpu_address; } /* * returns 1 if cpu is in stopped/check stopped state or not operational * returns 0 otherwise */ static inline int smp_cpu_not_running(int cpu) { __u32 status; switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) { case sigp_order_code_accepted: case sigp_status_stored: /* Check for stopped and check stop state */ if (status & 0x50) return 1; break; case sigp_not_operational: return 1; default: break; } return 0; } #define cpu_logical_map(cpu) (cpu) extern int __cpu_disable (void); extern void __cpu_die (unsigned int cpu); extern void cpu_die (void) __attribute__ ((noreturn)); extern int __cpu_up (unsigned int cpu); #endif #ifndef CONFIG_SMP static inline int smp_call_function_on(void (*func) (void *info), void *info, int nonatomic, int wait, int cpu) { func(info); return 0; } #define smp_cpu_not_running(cpu) 1 #define smp_get_cpu(cpu) ({ 0; }) #define smp_put_cpu(cpu) ({ 0; }) #define smp_setup_cpu_possible_map() do { } while (0) #endif #endif