xref: /openbmc/linux/arch/mips/include/asm/smp.h (revision d2999e1b)
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 
26 #define raw_smp_processor_id() (current_thread_info()->cpu)
27 
28 /* Map from cpu id to sequential logical cpu number.  This will only
29    not be idempotent when cpus failed to come on-line.	*/
30 extern int __cpu_number_map[NR_CPUS];
31 #define cpu_number_map(cpu)  __cpu_number_map[cpu]
32 
33 /* The reverse map from sequential logical cpu number to cpu id.  */
34 extern int __cpu_logical_map[NR_CPUS];
35 #define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
36 
37 #define NO_PROC_ID	(-1)
38 
39 #define SMP_RESCHEDULE_YOURSELF 0x1	/* XXX braindead */
40 #define SMP_CALL_FUNCTION	0x2
41 /* Octeon - Tell another core to flush its icache */
42 #define SMP_ICACHE_FLUSH	0x4
43 /* Used by kexec crashdump to save all cpu's state */
44 #define SMP_DUMP		0x8
45 #define SMP_ASK_C0COUNT		0x10
46 
47 extern volatile cpumask_t cpu_callin_map;
48 
49 /* Mask of CPUs which are currently definitely operating coherently */
50 extern cpumask_t cpu_coherent_mask;
51 
52 extern void asmlinkage smp_bootstrap(void);
53 
54 /*
55  * this function sends a 'reschedule' IPI to another CPU.
56  * it goes straight through and wastes no time serializing
57  * anything. Worst case is that we lose a reschedule ...
58  */
59 static inline void smp_send_reschedule(int cpu)
60 {
61 	extern struct plat_smp_ops *mp_ops;	/* private */
62 
63 	mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
64 }
65 
66 #ifdef CONFIG_HOTPLUG_CPU
67 static inline int __cpu_disable(void)
68 {
69 	extern struct plat_smp_ops *mp_ops;	/* private */
70 
71 	return mp_ops->cpu_disable();
72 }
73 
74 static inline void __cpu_die(unsigned int cpu)
75 {
76 	extern struct plat_smp_ops *mp_ops;	/* private */
77 
78 	mp_ops->cpu_die(cpu);
79 }
80 
81 extern void play_dead(void);
82 #endif
83 
84 extern asmlinkage void smp_call_function_interrupt(void);
85 
86 static inline void arch_send_call_function_single_ipi(int cpu)
87 {
88 	extern struct plat_smp_ops *mp_ops;	/* private */
89 
90 	mp_ops->send_ipi_mask(&cpumask_of_cpu(cpu), SMP_CALL_FUNCTION);
91 }
92 
93 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
94 {
95 	extern struct plat_smp_ops *mp_ops;	/* private */
96 
97 	mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
98 }
99 
100 #if defined(CONFIG_KEXEC)
101 extern void (*dump_ipi_function_ptr)(void *);
102 void dump_send_ipi(void (*dump_ipi_callback)(void *));
103 #endif
104 #endif /* __ASM_SMP_H */
105