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/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 */