arch/mips/include/asm/smp.h

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