xref: /openbmc/linux/arch/mips/include/asm/smp.h (revision ccb01374)
1 /*
2  * This file is subject to the terms and conditions of the GNU General
3  * Public License.  See the file "COPYING" in the main directory of this
4  * archive for more details.
5  *
6  * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
7  * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
8  * Copyright (C) 2000, 2001, 2002 Ralf Baechle
9  * Copyright (C) 2000, 2001 Broadcom Corporation
10  */
11 #ifndef __ASM_SMP_H
12 #define __ASM_SMP_H
13 
14 #include <linux/bitops.h>
15 #include <linux/linkage.h>
16 #include <linux/smp.h>
17 #include <linux/threads.h>
18 #include <linux/cpumask.h>
19 
20 #include <linux/atomic.h>
21 #include <asm/smp-ops.h>
22 
23 extern int smp_num_siblings;
24 extern cpumask_t cpu_sibling_map[];
25 extern cpumask_t cpu_core_map[];
26 extern cpumask_t cpu_foreign_map[];
27 
28 static inline int raw_smp_processor_id(void)
29 {
30 #if defined(__VDSO__)
31 	extern int vdso_smp_processor_id(void)
32 		__compiletime_error("VDSO should not call smp_processor_id()");
33 	return vdso_smp_processor_id();
34 #else
35 	return current_thread_info()->cpu;
36 #endif
37 }
38 #define raw_smp_processor_id raw_smp_processor_id
39 
40 /* Map from cpu id to sequential logical cpu number.  This will only
41    not be idempotent when cpus failed to come on-line.	*/
42 extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
43 #define cpu_number_map(cpu)  __cpu_number_map[cpu]
44 
45 /* The reverse map from sequential logical cpu number to cpu id.  */
46 extern int __cpu_logical_map[NR_CPUS];
47 #define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
48 
49 #define NO_PROC_ID	(-1)
50 
51 #define SMP_RESCHEDULE_YOURSELF 0x1	/* XXX braindead */
52 #define SMP_CALL_FUNCTION	0x2
53 /* Octeon - Tell another core to flush its icache */
54 #define SMP_ICACHE_FLUSH	0x4
55 #define SMP_ASK_C0COUNT		0x8
56 
57 /* Mask of CPUs which are currently definitely operating coherently */
58 extern cpumask_t cpu_coherent_mask;
59 
60 extern asmlinkage void smp_bootstrap(void);
61 
62 extern void calculate_cpu_foreign_map(void);
63 
64 /*
65  * this function sends a 'reschedule' IPI to another CPU.
66  * it goes straight through and wastes no time serializing
67  * anything. Worst case is that we lose a reschedule ...
68  */
69 static inline void smp_send_reschedule(int cpu)
70 {
71 	extern const struct plat_smp_ops *mp_ops;	/* private */
72 
73 	mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
74 }
75 
76 #ifdef CONFIG_HOTPLUG_CPU
77 static inline int __cpu_disable(void)
78 {
79 	extern const struct plat_smp_ops *mp_ops;	/* private */
80 
81 	return mp_ops->cpu_disable();
82 }
83 
84 static inline void __cpu_die(unsigned int cpu)
85 {
86 	extern const struct plat_smp_ops *mp_ops;	/* private */
87 
88 	mp_ops->cpu_die(cpu);
89 }
90 
91 extern void play_dead(void);
92 #endif
93 
94 #ifdef CONFIG_KEXEC
95 static inline void kexec_nonboot_cpu(void)
96 {
97 	extern const struct plat_smp_ops *mp_ops;	/* private */
98 
99 	return mp_ops->kexec_nonboot_cpu();
100 }
101 
102 static inline void *kexec_nonboot_cpu_func(void)
103 {
104 	extern const struct plat_smp_ops *mp_ops;	/* private */
105 
106 	return mp_ops->kexec_nonboot_cpu;
107 }
108 #endif
109 
110 /*
111  * This function will set up the necessary IPIs for Linux to communicate
112  * with the CPUs in mask.
113  * Return 0 on success.
114  */
115 int mips_smp_ipi_allocate(const struct cpumask *mask);
116 
117 /*
118  * This function will free up IPIs allocated with mips_smp_ipi_allocate to the
119  * CPUs in mask, which must be a subset of the IPIs that have been configured.
120  * Return 0 on success.
121  */
122 int mips_smp_ipi_free(const struct cpumask *mask);
123 
124 static inline void arch_send_call_function_single_ipi(int cpu)
125 {
126 	extern const struct plat_smp_ops *mp_ops;	/* private */
127 
128 	mp_ops->send_ipi_mask(cpumask_of(cpu), SMP_CALL_FUNCTION);
129 }
130 
131 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
132 {
133 	extern const struct plat_smp_ops *mp_ops;	/* private */
134 
135 	mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
136 }
137 
138 #endif /* __ASM_SMP_H */
139