1 /* 2 * smp.h: PowerPC-specific SMP code. 3 * 4 * Original was a copy of sparc smp.h. Now heavily modified 5 * for PPC. 6 * 7 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #ifndef _ASM_POWERPC_SMP_H 17 #define _ASM_POWERPC_SMP_H 18 #ifdef __KERNEL__ 19 20 #include <linux/threads.h> 21 #include <linux/cpumask.h> 22 #include <linux/kernel.h> 23 #include <linux/irqreturn.h> 24 25 #ifndef __ASSEMBLY__ 26 27 #ifdef CONFIG_PPC64 28 #include <asm/paca.h> 29 #endif 30 #include <asm/percpu.h> 31 32 extern int boot_cpuid; 33 extern int spinning_secondaries; 34 35 extern void cpu_die(void); 36 extern int cpu_to_chip_id(int cpu); 37 38 #ifdef CONFIG_SMP 39 40 struct smp_ops_t { 41 void (*message_pass)(int cpu, int msg); 42 #ifdef CONFIG_PPC_SMP_MUXED_IPI 43 void (*cause_ipi)(int cpu); 44 #endif 45 int (*cause_nmi_ipi)(int cpu); 46 void (*probe)(void); 47 int (*kick_cpu)(int nr); 48 int (*prepare_cpu)(int nr); 49 void (*setup_cpu)(int nr); 50 void (*bringup_done)(void); 51 void (*take_timebase)(void); 52 void (*give_timebase)(void); 53 int (*cpu_disable)(void); 54 void (*cpu_die)(unsigned int nr); 55 int (*cpu_bootable)(unsigned int nr); 56 }; 57 58 extern void smp_send_debugger_break(void); 59 extern void start_secondary_resume(void); 60 extern void smp_generic_give_timebase(void); 61 extern void smp_generic_take_timebase(void); 62 63 DECLARE_PER_CPU(unsigned int, cpu_pvr); 64 65 #ifdef CONFIG_HOTPLUG_CPU 66 int generic_cpu_disable(void); 67 void generic_cpu_die(unsigned int cpu); 68 void generic_set_cpu_dead(unsigned int cpu); 69 void generic_set_cpu_up(unsigned int cpu); 70 int generic_check_cpu_restart(unsigned int cpu); 71 int is_cpu_dead(unsigned int cpu); 72 #else 73 #define generic_set_cpu_up(i) do { } while (0) 74 #endif 75 76 #ifdef CONFIG_PPC64 77 #define raw_smp_processor_id() (local_paca->paca_index) 78 #define hard_smp_processor_id() (get_paca()->hw_cpu_id) 79 #else 80 /* 32-bit */ 81 extern int smp_hw_index[]; 82 83 #define raw_smp_processor_id() (current_thread_info()->cpu) 84 #define hard_smp_processor_id() (smp_hw_index[smp_processor_id()]) 85 86 static inline int get_hard_smp_processor_id(int cpu) 87 { 88 return smp_hw_index[cpu]; 89 } 90 91 static inline void set_hard_smp_processor_id(int cpu, int phys) 92 { 93 smp_hw_index[cpu] = phys; 94 } 95 #endif 96 97 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map); 98 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map); 99 100 static inline struct cpumask *cpu_sibling_mask(int cpu) 101 { 102 return per_cpu(cpu_sibling_map, cpu); 103 } 104 105 static inline struct cpumask *cpu_core_mask(int cpu) 106 { 107 return per_cpu(cpu_core_map, cpu); 108 } 109 110 extern int cpu_to_core_id(int cpu); 111 112 /* Since OpenPIC has only 4 IPIs, we use slightly different message numbers. 113 * 114 * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up 115 * in /proc/interrupts will be wrong!!! --Troy */ 116 #define PPC_MSG_CALL_FUNCTION 0 117 #define PPC_MSG_RESCHEDULE 1 118 #define PPC_MSG_TICK_BROADCAST 2 119 #define PPC_MSG_NMI_IPI 3 120 121 /* This is only used by the powernv kernel */ 122 #define PPC_MSG_RM_HOST_ACTION 4 123 124 #define NMI_IPI_ALL_OTHERS -2 125 126 #ifdef CONFIG_NMI_IPI 127 extern int smp_handle_nmi_ipi(struct pt_regs *regs); 128 #else 129 static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; } 130 #endif 131 132 /* for irq controllers that have dedicated ipis per message (4) */ 133 extern int smp_request_message_ipi(int virq, int message); 134 extern const char *smp_ipi_name[]; 135 136 /* for irq controllers with only a single ipi */ 137 extern void smp_muxed_ipi_message_pass(int cpu, int msg); 138 extern void smp_muxed_ipi_set_message(int cpu, int msg); 139 extern irqreturn_t smp_ipi_demux(void); 140 extern irqreturn_t smp_ipi_demux_relaxed(void); 141 142 void smp_init_pSeries(void); 143 void smp_init_cell(void); 144 void smp_setup_cpu_maps(void); 145 146 extern int __cpu_disable(void); 147 extern void __cpu_die(unsigned int cpu); 148 149 #else 150 /* for UP */ 151 #define hard_smp_processor_id() get_hard_smp_processor_id(0) 152 #define smp_setup_cpu_maps() 153 static inline void inhibit_secondary_onlining(void) {} 154 static inline void uninhibit_secondary_onlining(void) {} 155 static inline const struct cpumask *cpu_sibling_mask(int cpu) 156 { 157 return cpumask_of(cpu); 158 } 159 160 #endif /* CONFIG_SMP */ 161 162 #ifdef CONFIG_PPC64 163 static inline int get_hard_smp_processor_id(int cpu) 164 { 165 return paca[cpu].hw_cpu_id; 166 } 167 168 static inline void set_hard_smp_processor_id(int cpu, int phys) 169 { 170 paca[cpu].hw_cpu_id = phys; 171 } 172 #else 173 /* 32-bit */ 174 #ifndef CONFIG_SMP 175 extern int boot_cpuid_phys; 176 static inline int get_hard_smp_processor_id(int cpu) 177 { 178 return boot_cpuid_phys; 179 } 180 181 static inline void set_hard_smp_processor_id(int cpu, int phys) 182 { 183 boot_cpuid_phys = phys; 184 } 185 #endif /* !CONFIG_SMP */ 186 #endif /* !CONFIG_PPC64 */ 187 188 #if defined(CONFIG_PPC64) && (defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)) 189 extern void smp_release_cpus(void); 190 #else 191 static inline void smp_release_cpus(void) { }; 192 #endif 193 194 extern int smt_enabled_at_boot; 195 196 extern void smp_mpic_probe(void); 197 extern void smp_mpic_setup_cpu(int cpu); 198 extern int smp_generic_kick_cpu(int nr); 199 extern int smp_generic_cpu_bootable(unsigned int nr); 200 201 202 extern void smp_generic_give_timebase(void); 203 extern void smp_generic_take_timebase(void); 204 205 extern struct smp_ops_t *smp_ops; 206 207 extern void arch_send_call_function_single_ipi(int cpu); 208 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 209 210 /* Definitions relative to the secondary CPU spin loop 211 * and entry point. Not all of them exist on both 32 and 212 * 64-bit but defining them all here doesn't harm 213 */ 214 extern void generic_secondary_smp_init(void); 215 extern void generic_secondary_thread_init(void); 216 extern unsigned long __secondary_hold_spinloop; 217 extern unsigned long __secondary_hold_acknowledge; 218 extern char __secondary_hold; 219 extern unsigned int booting_thread_hwid; 220 221 extern void __early_start(void); 222 #endif /* __ASSEMBLY__ */ 223 224 #endif /* __KERNEL__ */ 225 #endif /* _ASM_POWERPC_SMP_H) */ 226