LXR linux/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
  23extern int smp_num_siblings;
  24extern cpumask_t cpu_sibling_map[];
  25extern cpumask_t cpu_core_map[];
  26extern cpumask_t cpu_foreign_map[];
  27
  28#define raw_smp_processor_id() (current_thread_info()->cpu)
  29
  30/* Map from cpu id to sequential logical cpu number.  This will only
  31   not be idempotent when cpus failed to come on-line.  */
  32extern int __cpu_number_map[NR_CPUS];
  33#define cpu_number_map(cpu)  __cpu_number_map[cpu]
  34
  35/* The reverse map from sequential logical cpu number to cpu id.  */
  36extern int __cpu_logical_map[NR_CPUS];
  37#define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
  38
  39#define NO_PROC_ID      (-1)
  40
  41#define SMP_RESCHEDULE_YOURSELF 0x1     /* XXX braindead */
  42#define SMP_CALL_FUNCTION       0x2
  43/* Octeon - Tell another core to flush its icache */
  44#define SMP_ICACHE_FLUSH        0x4
  45/* Used by kexec crashdump to save all cpu's state */
  46#define SMP_DUMP                0x8
  47#define SMP_ASK_C0COUNT         0x10
  48
  49extern cpumask_t cpu_callin_map;
  50
  51/* Mask of CPUs which are currently definitely operating coherently */
  52extern cpumask_t cpu_coherent_mask;
  53
  54extern void asmlinkage smp_bootstrap(void);
  55
  56extern void calculate_cpu_foreign_map(void);
  57
  58/*
  59 * this function sends a 'reschedule' IPI to another CPU.
  60 * it goes straight through and wastes no time serializing
  61 * anything. Worst case is that we lose a reschedule ...
  62 */
  63static inline void smp_send_reschedule(int cpu)
  64{
  65        extern struct plat_smp_ops *mp_ops;     /* private */
  66
  67        mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
  68}
  69
  70#ifdef CONFIG_HOTPLUG_CPU
  71static inline int __cpu_disable(void)
  72{
  73        extern struct plat_smp_ops *mp_ops;     /* private */
  74
  75        return mp_ops->cpu_disable();
  76}
  77
  78static inline void __cpu_die(unsigned int cpu)
  79{
  80        extern struct plat_smp_ops *mp_ops;     /* private */
  81
  82        mp_ops->cpu_die(cpu);
  83}
  84
  85extern void play_dead(void);
  86#endif
  87
  88/*
  89 * This function will set up the necessary IPIs for Linux to communicate
  90 * with the CPUs in mask.
  91 * Return 0 on success.
  92 */
  93int mips_smp_ipi_allocate(const struct cpumask *mask);
  94
  95/*
  96 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the
  97 * CPUs in mask, which must be a subset of the IPIs that have been configured.
  98 * Return 0 on success.
  99 */
 100int mips_smp_ipi_free(const struct cpumask *mask);
 101
 102static inline void arch_send_call_function_single_ipi(int cpu)
 103{
 104        extern struct plat_smp_ops *mp_ops;     /* private */
 105
 106        mp_ops->send_ipi_mask(cpumask_of(cpu), SMP_CALL_FUNCTION);
 107}
 108
 109static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 110{
 111        extern struct plat_smp_ops *mp_ops;     /* private */
 112
 113        mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
 114}
 115
 116#if defined(CONFIG_KEXEC)
 117extern void (*dump_ipi_function_ptr)(void *);
 118void dump_send_ipi(void (*dump_ipi_callback)(void *));
 119#endif
 120#endif /* __ASM_SMP_H */
 121