| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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/config.h> |
| 14 | #include <linux/threads.h> |
| 15 | #include <linux/cpumask.h> |
| 16 | #include <linux/bitops.h> |
| 17 | |
| 18 | #if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__) |
| 19 | |
| 20 | #include <asm/lowcore.h> |
| 21 | #include <asm/sigp.h> |
| 22 | |
| 23 | /* |
| 24 | s390 specific smp.c headers |
| 25 | */ |
| 26 | typedef struct |
| 27 | { |
| 28 | int intresting; |
| 29 | sigp_ccode ccode; |
| 30 | __u32 status; |
| 31 | __u16 cpu; |
| 32 | } sigp_info; |
| 33 | |
| 34 | extern int smp_call_function_on(void (*func) (void *info), void *info, |
| 35 | int nonatomic, int wait, int cpu); |
| 36 | #define NO_PROC_ID 0xFF /* No processor magic marker */ |
| 37 | |
| 38 | /* |
| 39 | * This magic constant controls our willingness to transfer |
| 40 | * a process across CPUs. Such a transfer incurs misses on the L1 |
| 41 | * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My |
| 42 | * gut feeling is this will vary by board in value. For a board |
| 43 | * with separate L2 cache it probably depends also on the RSS, and |
| 44 | * for a board with shared L2 cache it ought to decay fast as other |
| 45 | * processes are run. |
| 46 | */ |
| 47 | |
| 48 | #define PROC_CHANGE_PENALTY 20 /* Schedule penalty */ |
| 49 | |
| 50 | #define smp_processor_id() (S390_lowcore.cpu_data.cpu_nr) |
| 51 | |
| 52 | extern int smp_get_cpu(cpumask_t cpu_map); |
| 53 | extern void smp_put_cpu(int cpu); |
| 54 | |
| 55 | extern __inline__ __u16 hard_smp_processor_id(void) |
| 56 | { |
| 57 | __u16 cpu_address; |
| 58 | |
| 59 | __asm__ ("stap %0\n" : "=m" (cpu_address)); |
| 60 | return cpu_address; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * returns 1 if cpu is in stopped/check stopped state or not operational |
| 65 | * returns 0 otherwise |
| 66 | */ |
| 67 | static inline int |
| 68 | smp_cpu_not_running(int cpu) |
| 69 | { |
| 70 | __u32 status; |
| 71 | |
| 72 | switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) { |
| 73 | case sigp_order_code_accepted: |
| 74 | case sigp_status_stored: |
| 75 | /* Check for stopped and check stop state */ |
| 76 | if (status & 0x50) |
| 77 | return 1; |
| 78 | break; |
| 79 | case sigp_not_operational: |
| 80 | return 1; |
| 81 | default: |
| 82 | break; |
| 83 | } |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | #define cpu_logical_map(cpu) (cpu) |
| 88 | |
| 89 | extern int __cpu_disable (void); |
| 90 | extern void __cpu_die (unsigned int cpu); |
| 91 | extern void cpu_die (void) __attribute__ ((noreturn)); |
| 92 | extern int __cpu_up (unsigned int cpu); |
| 93 | |
| 94 | #endif |
| 95 | |
| 96 | #ifndef CONFIG_SMP |
| 97 | static inline int |
| 98 | smp_call_function_on(void (*func) (void *info), void *info, |
| 99 | int nonatomic, int wait, int cpu) |
| 100 | { |
| 101 | func(info); |
| 102 | return 0; |
| 103 | } |
| 104 | #define smp_get_cpu(cpu) ({ 0; }) |
| 105 | #define smp_put_cpu(cpu) ({ 0; }) |
| 106 | #endif |
| 107 | |
| 108 | #endif |