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Linux kernel mirror (for testing)
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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
32extern int boot_cpuid;
33extern int spinning_secondaries;
34extern u32 *cpu_to_phys_id;
35
36extern void cpu_die(void);
37extern int cpu_to_chip_id(int cpu);
38
39#ifdef CONFIG_SMP
40
41struct 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
59extern void smp_flush_nmi_ipi(u64 delay_us);
60extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
61extern void smp_send_debugger_break(void);
62extern void start_secondary_resume(void);
63extern void smp_generic_give_timebase(void);
64extern void smp_generic_take_timebase(void);
65
66DECLARE_PER_CPU(unsigned int, cpu_pvr);
67
68#ifdef CONFIG_HOTPLUG_CPU
69int generic_cpu_disable(void);
70void generic_cpu_die(unsigned int cpu);
71void generic_set_cpu_dead(unsigned int cpu);
72void generic_set_cpu_up(unsigned int cpu);
73int generic_check_cpu_restart(unsigned int cpu);
74int 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 */
84extern int smp_hw_index[];
85
86#define raw_smp_processor_id() (current_thread_info()->cpu)
87#define hard_smp_processor_id() (smp_hw_index[smp_processor_id()])
88
89static inline int get_hard_smp_processor_id(int cpu)
90{
91 return smp_hw_index[cpu];
92}
93
94static inline void set_hard_smp_processor_id(int cpu, int phys)
95{
96 smp_hw_index[cpu] = phys;
97}
98#endif
99
100DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
101DECLARE_PER_CPU(cpumask_var_t, cpu_l2_cache_map);
102DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
103
104static inline struct cpumask *cpu_sibling_mask(int cpu)
105{
106 return per_cpu(cpu_sibling_map, cpu);
107}
108
109static inline struct cpumask *cpu_core_mask(int cpu)
110{
111 return per_cpu(cpu_core_map, cpu);
112}
113
114static inline struct cpumask *cpu_l2_cache_mask(int cpu)
115{
116 return per_cpu(cpu_l2_cache_map, cpu);
117}
118
119extern int cpu_to_core_id(int cpu);
120
121/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
122 *
123 * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up
124 * in /proc/interrupts will be wrong!!! --Troy */
125#define PPC_MSG_CALL_FUNCTION 0
126#define PPC_MSG_RESCHEDULE 1
127#define PPC_MSG_TICK_BROADCAST 2
128#define PPC_MSG_NMI_IPI 3
129
130/* This is only used by the powernv kernel */
131#define PPC_MSG_RM_HOST_ACTION 4
132
133#define NMI_IPI_ALL_OTHERS -2
134
135#ifdef CONFIG_NMI_IPI
136extern int smp_handle_nmi_ipi(struct pt_regs *regs);
137#else
138static inline int smp_handle_nmi_ipi(struct pt_regs *regs) { return 0; }
139#endif
140
141/* for irq controllers that have dedicated ipis per message (4) */
142extern int smp_request_message_ipi(int virq, int message);
143extern const char *smp_ipi_name[];
144
145/* for irq controllers with only a single ipi */
146extern void smp_muxed_ipi_message_pass(int cpu, int msg);
147extern void smp_muxed_ipi_set_message(int cpu, int msg);
148extern irqreturn_t smp_ipi_demux(void);
149extern irqreturn_t smp_ipi_demux_relaxed(void);
150
151void smp_init_pSeries(void);
152void smp_init_cell(void);
153void smp_setup_cpu_maps(void);
154
155extern int __cpu_disable(void);
156extern void __cpu_die(unsigned int cpu);
157
158#else
159/* for UP */
160#define hard_smp_processor_id() get_hard_smp_processor_id(0)
161#define smp_setup_cpu_maps()
162static inline void inhibit_secondary_onlining(void) {}
163static inline void uninhibit_secondary_onlining(void) {}
164static inline const struct cpumask *cpu_sibling_mask(int cpu)
165{
166 return cpumask_of(cpu);
167}
168
169#endif /* CONFIG_SMP */
170
171#ifdef CONFIG_PPC64
172static inline int get_hard_smp_processor_id(int cpu)
173{
174 return paca_ptrs[cpu]->hw_cpu_id;
175}
176
177static inline void set_hard_smp_processor_id(int cpu, int phys)
178{
179 paca_ptrs[cpu]->hw_cpu_id = phys;
180}
181#else
182/* 32-bit */
183#ifndef CONFIG_SMP
184extern int boot_cpuid_phys;
185static inline int get_hard_smp_processor_id(int cpu)
186{
187 return boot_cpuid_phys;
188}
189
190static inline void set_hard_smp_processor_id(int cpu, int phys)
191{
192 boot_cpuid_phys = phys;
193}
194#endif /* !CONFIG_SMP */
195#endif /* !CONFIG_PPC64 */
196
197#if defined(CONFIG_PPC64) && (defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE))
198extern void smp_release_cpus(void);
199#else
200static inline void smp_release_cpus(void) { };
201#endif
202
203extern int smt_enabled_at_boot;
204
205extern void smp_mpic_probe(void);
206extern void smp_mpic_setup_cpu(int cpu);
207extern int smp_generic_kick_cpu(int nr);
208extern int smp_generic_cpu_bootable(unsigned int nr);
209
210
211extern void smp_generic_give_timebase(void);
212extern void smp_generic_take_timebase(void);
213
214extern struct smp_ops_t *smp_ops;
215
216extern void arch_send_call_function_single_ipi(int cpu);
217extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
218
219/* Definitions relative to the secondary CPU spin loop
220 * and entry point. Not all of them exist on both 32 and
221 * 64-bit but defining them all here doesn't harm
222 */
223extern void generic_secondary_smp_init(void);
224extern void generic_secondary_thread_init(void);
225extern unsigned long __secondary_hold_spinloop;
226extern unsigned long __secondary_hold_acknowledge;
227extern char __secondary_hold;
228extern unsigned int booting_thread_hwid;
229
230extern void __early_start(void);
231#endif /* __ASSEMBLY__ */
232
233#endif /* __KERNEL__ */
234#endif /* _ASM_POWERPC_SMP_H) */