1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * smp.h: PowerPC-specific SMP code.
4 *
5 * Original was a copy of sparc smp.h. Now heavily modified
6 * for PPC.
7 *
8 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com>
10 */
11
12 #ifndef _ASM_POWERPC_SMP_H
13 #define _ASM_POWERPC_SMP_H
14 #ifdef __KERNEL__
15
16 #include <linux/threads.h>
17 #include <linux/cpumask.h>
18 #include <linux/kernel.h>
19 #include <linux/irqreturn.h>
20
21 #ifndef __ASSEMBLY__
22
23 #ifdef CONFIG_PPC64
24 #include <asm/paca.h>
25 #endif
26 #include <asm/percpu.h>
27
28 extern int boot_cpuid;
29 extern int spinning_secondaries;
30 extern u32 *cpu_to_phys_id;
31
32 extern void cpu_die(void);
33 extern int cpu_to_chip_id(int cpu);
34
35 #ifdef CONFIG_SMP
36
37 struct smp_ops_t {
38 void (*message_pass)(int cpu, int msg);
39 #ifdef CONFIG_PPC_SMP_MUXED_IPI
40 void (*cause_ipi)(int cpu);
41 #endif
42 int (*cause_nmi_ipi)(int cpu);
43 void (*probe)(void);
44 int (*kick_cpu)(int nr);
45 int (*prepare_cpu)(int nr);
46 void (*setup_cpu)(int nr);
47 void (*bringup_done)(void);
48 void (*take_timebase)(void);
49 void (*give_timebase)(void);
50 int (*cpu_disable)(void);
51 void (*cpu_die)(unsigned int nr);
52 int (*cpu_bootable)(unsigned int nr);
53 };
54
55 extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
56 extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
57 extern void smp_send_debugger_break(void);
58 extern void start_secondary_resume(void);
59 extern void smp_generic_give_timebase(void);
60 extern void smp_generic_take_timebase(void);
61
62 DECLARE_PER_CPU(unsigned int, cpu_pvr);
63
64 #ifdef CONFIG_HOTPLUG_CPU
65 int generic_cpu_disable(void);
66 void generic_cpu_die(unsigned int cpu);
67 void generic_set_cpu_dead(unsigned int cpu);
68 void generic_set_cpu_up(unsigned int cpu);
69 int generic_check_cpu_restart(unsigned int cpu);
70 int is_cpu_dead(unsigned int cpu);
71 #else
72 #define generic_set_cpu_up(i) do { } while (0)
73 #endif
74
75 #ifdef CONFIG_PPC64
76 #define raw_smp_processor_id() (local_paca->paca_index)
77 #define hard_smp_processor_id() (get_paca()->hw_cpu_id)
78 #else
79 /* 32-bit */
80 extern int smp_hw_index[];
81
82 /*
83 * This is particularly ugly: it appears we can't actually get the definition
84 * of task_struct here, but we need access to the CPU this task is running on.
85 * Instead of using task_struct we're using _TASK_CPU which is extracted from
86 * asm-offsets.h by kbuild to get the current processor ID.
87 *
88 * This also needs to be safeguarded when building asm-offsets.s because at
89 * that time _TASK_CPU is not defined yet. It could have been guarded by
90 * _TASK_CPU itself, but we want the build to fail if _TASK_CPU is missing
91 * when building something else than asm-offsets.s
92 */
93 #ifdef GENERATING_ASM_OFFSETS
94 #define raw_smp_processor_id() (0)
95 #else
96 #define raw_smp_processor_id() (*(unsigned int *)((void *)current + _TASK_CPU))
97 #endif
98 #define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
99
get_hard_smp_processor_id(int cpu)100 static inline int get_hard_smp_processor_id(int cpu)
101 {
102 return smp_hw_index[cpu];
103 }
104
set_hard_smp_processor_id(int cpu,int phys)105 static inline void set_hard_smp_processor_id(int cpu, int phys)
106 {
107 smp_hw_index[cpu] = phys;
108 }
109 #endif
110
111 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
112 DECLARE_PER_CPU(cpumask_var_t, cpu_l2_cache_map);
113 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
114 DECLARE_PER_CPU(cpumask_var_t, cpu_smallcore_map);
115
cpu_sibling_mask(int cpu)116 static inline struct cpumask *cpu_sibling_mask(int cpu)
117 {
118 return per_cpu(cpu_sibling_map, cpu);
119 }
120
cpu_core_mask(int cpu)121 static inline struct cpumask *cpu_core_mask(int cpu)
122 {
123 return per_cpu(cpu_core_map, cpu);
124 }
125
cpu_l2_cache_mask(int cpu)126 static inline struct cpumask *cpu_l2_cache_mask(int cpu)
127 {
128 return per_cpu(cpu_l2_cache_map, cpu);
129 }
130
cpu_smallcore_mask(int cpu)131 static inline struct cpumask *cpu_smallcore_mask(int cpu)
132 {
133 return per_cpu(cpu_smallcore_map, cpu);
134 }
135
136 extern int cpu_to_core_id(int cpu);
137
138 /* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
139 *
140 * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up
141 * in /proc/interrupts will be wrong!!! --Troy */
142 #define PPC_MSG_CALL_FUNCTION 0
143 #define PPC_MSG_RESCHEDULE 1
144 #define PPC_MSG_TICK_BROADCAST 2
145 #define PPC_MSG_NMI_IPI 3
146
147 /* This is only used by the powernv kernel */
148 #define PPC_MSG_RM_HOST_ACTION 4
149
150 #define NMI_IPI_ALL_OTHERS -2
151
152 #ifdef CONFIG_NMI_IPI
153 extern int smp_handle_nmi_ipi(struct pt_regs *regs);
154 #else
smp_handle_nmi_ipi(struct pt_regs * regs)155 static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; }
156 #endif
157
158 /* for irq controllers that have dedicated ipis per message (4) */
159 extern int smp_request_message_ipi(int virq, int message);
160 extern const char *smp_ipi_name[];
161
162 /* for irq controllers with only a single ipi */
163 extern void smp_muxed_ipi_message_pass(int cpu, int msg);
164 extern void smp_muxed_ipi_set_message(int cpu, int msg);
165 extern irqreturn_t smp_ipi_demux(void);
166 extern irqreturn_t smp_ipi_demux_relaxed(void);
167
168 void smp_init_pSeries(void);
169 void smp_init_cell(void);
170 void smp_setup_cpu_maps(void);
171
172 extern int __cpu_disable(void);
173 extern void __cpu_die(unsigned int cpu);
174
175 #else
176 /* for UP */
177 #define hard_smp_processor_id() get_hard_smp_processor_id(0)
178 #define smp_setup_cpu_maps()
inhibit_secondary_onlining(void)179 static inline void inhibit_secondary_onlining(void) {}
uninhibit_secondary_onlining(void)180 static inline void uninhibit_secondary_onlining(void) {}
cpu_sibling_mask(int cpu)181 static inline const struct cpumask *cpu_sibling_mask(int cpu)
182 {
183 return cpumask_of(cpu);
184 }
185
cpu_smallcore_mask(int cpu)186 static inline const struct cpumask *cpu_smallcore_mask(int cpu)
187 {
188 return cpumask_of(cpu);
189 }
190
191 #endif /* CONFIG_SMP */
192
193 #ifdef CONFIG_PPC64
get_hard_smp_processor_id(int cpu)194 static inline int get_hard_smp_processor_id(int cpu)
195 {
196 return paca_ptrs[cpu]->hw_cpu_id;
197 }
198
set_hard_smp_processor_id(int cpu,int phys)199 static inline void set_hard_smp_processor_id(int cpu, int phys)
200 {
201 paca_ptrs[cpu]->hw_cpu_id = phys;
202 }
203 #else
204 /* 32-bit */
205 #ifndef CONFIG_SMP
206 extern int boot_cpuid_phys;
get_hard_smp_processor_id(int cpu)207 static inline int get_hard_smp_processor_id(int cpu)
208 {
209 return boot_cpuid_phys;
210 }
211
set_hard_smp_processor_id(int cpu,int phys)212 static inline void set_hard_smp_processor_id(int cpu, int phys)
213 {
214 boot_cpuid_phys = phys;
215 }
216 #endif /* !CONFIG_SMP */
217 #endif /* !CONFIG_PPC64 */
218
219 #if defined(CONFIG_PPC64) && (defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE))
220 extern void smp_release_cpus(void);
221 #else
smp_release_cpus(void)222 static inline void smp_release_cpus(void) { };
223 #endif
224
225 extern int smt_enabled_at_boot;
226
227 extern void smp_mpic_probe(void);
228 extern void smp_mpic_setup_cpu(int cpu);
229 extern int smp_generic_kick_cpu(int nr);
230 extern int smp_generic_cpu_bootable(unsigned int nr);
231
232
233 extern void smp_generic_give_timebase(void);
234 extern void smp_generic_take_timebase(void);
235
236 extern struct smp_ops_t *smp_ops;
237
238 extern void arch_send_call_function_single_ipi(int cpu);
239 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
240
241 /* Definitions relative to the secondary CPU spin loop
242 * and entry point. Not all of them exist on both 32 and
243 * 64-bit but defining them all here doesn't harm
244 */
245 extern void generic_secondary_smp_init(void);
246 extern void generic_secondary_thread_init(void);
247 extern unsigned long __secondary_hold_spinloop;
248 extern unsigned long __secondary_hold_acknowledge;
249 extern char __secondary_hold;
250 extern unsigned int booting_thread_hwid;
251
252 extern void __early_start(void);
253 #endif /* __ASSEMBLY__ */
254
255 #endif /* __KERNEL__ */
256 #endif /* _ASM_POWERPC_SMP_H) */
257
