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 extern u32 *cpu_to_phys_id; 35 36 extern void cpu_die(void); 37 extern int cpu_to_chip_id(int cpu); 38 39 #ifdef CONFIG_SMP 40 41 struct smp_ops_t { 42 void (*message_pass)(int cpu, int msg); 43 #ifdef CONFIG_PPC_SMP_MUXED_IPI 44 void (*cause_ipi)(int cpu); 45 #endif 46 int (*cause_nmi_ipi)(int cpu); 47 void (*probe)(void); 48 int (*kick_cpu)(int nr); 49 int (*prepare_cpu)(int nr); 50 void (*setup_cpu)(int nr); 51 void (*bringup_done)(void); 52 void (*take_timebase)(void); 53 void (*give_timebase)(void); 54 int (*cpu_disable)(void); 55 void (*cpu_die)(unsigned int nr); 56 int (*cpu_bootable)(unsigned int nr); 57 }; 58 59 extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); 60 extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us); 61 extern void smp_send_debugger_break(void); 62 extern void start_secondary_resume(void); 63 extern void smp_generic_give_timebase(void); 64 extern void smp_generic_take_timebase(void); 65 66 DECLARE_PER_CPU(unsigned int, cpu_pvr); 67 68 #ifdef CONFIG_HOTPLUG_CPU 69 int generic_cpu_disable(void); 70 void generic_cpu_die(unsigned int cpu); 71 void generic_set_cpu_dead(unsigned int cpu); 72 void generic_set_cpu_up(unsigned int cpu); 73 int generic_check_cpu_restart(unsigned int cpu); 74 int is_cpu_dead(unsigned int cpu); 75 #else 76 #define generic_set_cpu_up(i) do { } while (0) 77 #endif 78 79 #ifdef CONFIG_PPC64 80 #define raw_smp_processor_id() (local_paca->paca_index) 81 #define hard_smp_processor_id() (get_paca()->hw_cpu_id) 82 #else 83 /* 32-bit */ 84 extern int smp_hw_index[]; 85 86 /* 87 * This is particularly ugly: it appears we can't actually get the definition 88 * of task_struct here, but we need access to the CPU this task is running on. 89 * Instead of using task_struct we're using _TASK_CPU which is extracted from 90 * asm-offsets.h by kbuild to get the current processor ID. 91 * 92 * This also needs to be safeguarded when building asm-offsets.s because at 93 * that time _TASK_CPU is not defined yet. It could have been guarded by 94 * _TASK_CPU itself, but we want the build to fail if _TASK_CPU is missing 95 * when building something else than asm-offsets.s 96 */ 97 #ifdef GENERATING_ASM_OFFSETS 98 #define raw_smp_processor_id() (0) 99 #else 100 #define raw_smp_processor_id() (*(unsigned int *)((void *)current + _TASK_CPU)) 101 #endif 102 #define hard_smp_processor_id() (smp_hw_index[smp_processor_id()]) 103 104 static inline int get_hard_smp_processor_id(int cpu) 105 { 106 return smp_hw_index[cpu]; 107 } 108 109 static inline void set_hard_smp_processor_id(int cpu, int phys) 110 { 111 smp_hw_index[cpu] = phys; 112 } 113 #endif 114 115 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map); 116 DECLARE_PER_CPU(cpumask_var_t, cpu_l2_cache_map); 117 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map); 118 DECLARE_PER_CPU(cpumask_var_t, cpu_smallcore_map); 119 120 static inline struct cpumask *cpu_sibling_mask(int cpu) 121 { 122 return per_cpu(cpu_sibling_map, cpu); 123 } 124 125 static inline struct cpumask *cpu_core_mask(int cpu) 126 { 127 return per_cpu(cpu_core_map, cpu); 128 } 129 130 static inline struct cpumask *cpu_l2_cache_mask(int cpu) 131 { 132 return per_cpu(cpu_l2_cache_map, cpu); 133 } 134 135 static inline struct cpumask *cpu_smallcore_mask(int cpu) 136 { 137 return per_cpu(cpu_smallcore_map, cpu); 138 } 139 140 extern int cpu_to_core_id(int cpu); 141 142 /* Since OpenPIC has only 4 IPIs, we use slightly different message numbers. 143 * 144 * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up 145 * in /proc/interrupts will be wrong!!! --Troy */ 146 #define PPC_MSG_CALL_FUNCTION 0 147 #define PPC_MSG_RESCHEDULE 1 148 #define PPC_MSG_TICK_BROADCAST 2 149 #define PPC_MSG_NMI_IPI 3 150 151 /* This is only used by the powernv kernel */ 152 #define PPC_MSG_RM_HOST_ACTION 4 153 154 #define NMI_IPI_ALL_OTHERS -2 155 156 #ifdef CONFIG_NMI_IPI 157 extern int smp_handle_nmi_ipi(struct pt_regs *regs); 158 #else 159 static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; } 160 #endif 161 162 /* for irq controllers that have dedicated ipis per message (4) */ 163 extern int smp_request_message_ipi(int virq, int message); 164 extern const char *smp_ipi_name[]; 165 166 /* for irq controllers with only a single ipi */ 167 extern void smp_muxed_ipi_message_pass(int cpu, int msg); 168 extern void smp_muxed_ipi_set_message(int cpu, int msg); 169 extern irqreturn_t smp_ipi_demux(void); 170 extern irqreturn_t smp_ipi_demux_relaxed(void); 171 172 void smp_init_pSeries(void); 173 void smp_init_cell(void); 174 void smp_setup_cpu_maps(void); 175 176 extern int __cpu_disable(void); 177 extern void __cpu_die(unsigned int cpu); 178 179 #else 180 /* for UP */ 181 #define hard_smp_processor_id() get_hard_smp_processor_id(0) 182 #define smp_setup_cpu_maps() 183 static inline void inhibit_secondary_onlining(void) {} 184 static inline void uninhibit_secondary_onlining(void) {} 185 static inline const struct cpumask *cpu_sibling_mask(int cpu) 186 { 187 return cpumask_of(cpu); 188 } 189 190 static inline const struct cpumask *cpu_smallcore_mask(int cpu) 191 { 192 return cpumask_of(cpu); 193 } 194 195 #endif /* CONFIG_SMP */ 196 197 #ifdef CONFIG_PPC64 198 static inline int get_hard_smp_processor_id(int cpu) 199 { 200 return paca_ptrs[cpu]->hw_cpu_id; 201 } 202 203 static inline void set_hard_smp_processor_id(int cpu, int phys) 204 { 205 paca_ptrs[cpu]->hw_cpu_id = phys; 206 } 207 #else 208 /* 32-bit */ 209 #ifndef CONFIG_SMP 210 extern int boot_cpuid_phys; 211 static inline int get_hard_smp_processor_id(int cpu) 212 { 213 return boot_cpuid_phys; 214 } 215 216 static inline void set_hard_smp_processor_id(int cpu, int phys) 217 { 218 boot_cpuid_phys = phys; 219 } 220 #endif /* !CONFIG_SMP */ 221 #endif /* !CONFIG_PPC64 */ 222 223 #if defined(CONFIG_PPC64) && (defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)) 224 extern void smp_release_cpus(void); 225 #else 226 static inline void smp_release_cpus(void) { }; 227 #endif 228 229 extern int smt_enabled_at_boot; 230 231 extern void smp_mpic_probe(void); 232 extern void smp_mpic_setup_cpu(int cpu); 233 extern int smp_generic_kick_cpu(int nr); 234 extern int smp_generic_cpu_bootable(unsigned int nr); 235 236 237 extern void smp_generic_give_timebase(void); 238 extern void smp_generic_take_timebase(void); 239 240 extern struct smp_ops_t *smp_ops; 241 242 extern void arch_send_call_function_single_ipi(int cpu); 243 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 244 245 /* Definitions relative to the secondary CPU spin loop 246 * and entry point. Not all of them exist on both 32 and 247 * 64-bit but defining them all here doesn't harm 248 */ 249 extern void generic_secondary_smp_init(void); 250 extern void generic_secondary_thread_init(void); 251 extern unsigned long __secondary_hold_spinloop; 252 extern unsigned long __secondary_hold_acknowledge; 253 extern char __secondary_hold; 254 extern unsigned int booting_thread_hwid; 255 256 extern void __early_start(void); 257 #endif /* __ASSEMBLY__ */ 258 259 #endif /* __KERNEL__ */ 260 #endif /* _ASM_POWERPC_SMP_H) */ 261