mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 19:41:54 +00:00
9b6695a8ad
A recent change requires cpu_possible_map to be initialized before
smp_sched_init() but most MIPS platforms were initializing their
processors in the prom_prepare_cpus callback of smp_prepare_cpus. The
simple fix of calling prom_prepare_cpus from one of the earlier SMP
initialization hooks doesn't work well either since IPIs may require
init_IRQ() to have completed, so bit the bullet and split
prom_prepare_cpus into two initialization functions, plat_smp_setup
which is called early from setup_arch and plat_prepare_cpus called where
prom_prepare_cpus used to be called.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file "COPYING" in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
|
|
* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
|
|
* Copyright (C) 2000, 2001, 2002 Ralf Baechle
|
|
* Copyright (C) 2000, 2001 Broadcom Corporation
|
|
*/
|
|
#ifndef __ASM_SMP_H
|
|
#define __ASM_SMP_H
|
|
|
|
#include <linux/config.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/cpumask.h>
|
|
#include <asm/atomic.h>
|
|
|
|
#define raw_smp_processor_id() (current_thread_info()->cpu)
|
|
|
|
/* Map from cpu id to sequential logical cpu number. This will only
|
|
not be idempotent when cpus failed to come on-line. */
|
|
extern int __cpu_number_map[NR_CPUS];
|
|
#define cpu_number_map(cpu) __cpu_number_map[cpu]
|
|
|
|
/* The reverse map from sequential logical cpu number to cpu id. */
|
|
extern int __cpu_logical_map[NR_CPUS];
|
|
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
|
|
|
|
#define NO_PROC_ID (-1)
|
|
|
|
struct call_data_struct {
|
|
void (*func)(void *);
|
|
void *info;
|
|
atomic_t started;
|
|
atomic_t finished;
|
|
int wait;
|
|
};
|
|
|
|
extern struct call_data_struct *call_data;
|
|
|
|
#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
|
|
#define SMP_CALL_FUNCTION 0x2
|
|
|
|
extern cpumask_t phys_cpu_present_map;
|
|
extern cpumask_t cpu_online_map;
|
|
#define cpu_possible_map phys_cpu_present_map
|
|
|
|
extern cpumask_t cpu_callout_map;
|
|
/* We don't mark CPUs online until __cpu_up(), so we need another measure */
|
|
static inline int num_booting_cpus(void)
|
|
{
|
|
return cpus_weight(cpu_callout_map);
|
|
}
|
|
|
|
/*
|
|
* These are defined by the board-specific code.
|
|
*/
|
|
|
|
/*
|
|
* Cause the function described by call_data to be executed on the passed
|
|
* cpu. When the function has finished, increment the finished field of
|
|
* call_data.
|
|
*/
|
|
extern void core_send_ipi(int cpu, unsigned int action);
|
|
|
|
/*
|
|
* Firmware CPU startup hook
|
|
*/
|
|
extern void prom_boot_secondary(int cpu, struct task_struct *idle);
|
|
|
|
/*
|
|
* After we've done initial boot, this function is called to allow the
|
|
* board code to clean up state, if needed
|
|
*/
|
|
extern void prom_init_secondary(void);
|
|
|
|
/*
|
|
* Populate cpu_possible_map before smp_init, called from setup_arch.
|
|
*/
|
|
extern void plat_smp_setup(void);
|
|
|
|
/*
|
|
* Called after init_IRQ but before __cpu_up.
|
|
*/
|
|
extern void prom_prepare_cpus(unsigned int max_cpus);
|
|
|
|
/*
|
|
* Last chance for the board code to finish SMP initialization before
|
|
* the CPU is "online".
|
|
*/
|
|
extern void prom_smp_finish(void);
|
|
|
|
/* Hook for after all CPUs are online */
|
|
extern void prom_cpus_done(void);
|
|
|
|
extern void asmlinkage smp_bootstrap(void);
|
|
|
|
/*
|
|
* this function sends a 'reschedule' IPI to another CPU.
|
|
* it goes straight through and wastes no time serializing
|
|
* anything. Worst case is that we lose a reschedule ...
|
|
*/
|
|
static inline void smp_send_reschedule(int cpu)
|
|
{
|
|
core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
|
|
}
|
|
|
|
extern asmlinkage void smp_call_function_interrupt(void);
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#endif /* __ASM_SMP_H */
|