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 #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.  */
  32 extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
  33 #define cpu_number_map(cpu)  __cpu_number_map[cpu]
  34
  35 /* The reverse map from sequential logical cpu number to cpu id.  */
  36 extern 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 #define SMP_ASK_C0COUNT         0x8
  46
  47 /* Mask of CPUs which are currently definitely operating coherently */
  48 extern cpumask_t cpu_coherent_mask;
  49
  50 extern asmlinkage void smp_bootstrap(void);
  51
  52 extern void calculate_cpu_foreign_map(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 const 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 const 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 const 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 /*
  85  * This function will set up the necessary IPIs for Linux to communicate
  86  * with the CPUs in mask.
  87  * Return 0 on success.
  88  */
  89 int mips_smp_ipi_allocate(const struct cpumask *mask);
  90
  91 /*
  92  * This function will free up IPIs allocated with mips_smp_ipi_allocate to the
  93  * CPUs in mask, which must be a subset of the IPIs that have been configured.
  94  * Return 0 on success.
  95  */
  96 int mips_smp_ipi_free(const struct cpumask *mask);
  97
  98 static inline void arch_send_call_function_single_ipi(int cpu)
  99 {
 100         extern const struct plat_smp_ops *mp_ops;       /* private */
 101
 102         mp_ops->send_ipi_mask(cpumask_of(cpu), SMP_CALL_FUNCTION);
 103 }
 104
 105 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 106 {
 107         extern const struct plat_smp_ops *mp_ops;       /* private */
 108
 109         mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
 110 }
 111
 112 #endif /* __ASM_SMP_H */