diff options
Diffstat (limited to 'arch/sh/kernel/smp.c')
| -rw-r--r-- | arch/sh/kernel/smp.c | 167 |
1 files changed, 92 insertions, 75 deletions
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index f93d5ff..94075e1 100644 --- a/arch/sh/kernel/smp.c +++ b/arch/sh/kernel/smp.c @@ -3,68 +3,40 @@ * * SMP support for the SuperH processors. * - * Copyright (C) 2002, 2003 Paul Mundt + * Copyright (C) 2002 - 2007 Paul Mundt + * Copyright (C) 2006 - 2007 Akio Idehara * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. + * 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. */ - #include <linux/err.h> #include <linux/cache.h> #include <linux/cpumask.h> #include <linux/delay.h> #include <linux/init.h> -#include <linux/interrupt.h> #include <linux/spinlock.h> -#include <linux/threads.h> +#include <linux/mm.h> #include <linux/module.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/sched.h> -#include <linux/module.h> - +#include <linux/interrupt.h> #include <asm/atomic.h> #include <asm/processor.h> #include <asm/system.h> #include <asm/mmu_context.h> #include <asm/smp.h> +#include <asm/cacheflush.h> +#include <asm/sections.h> -/* - * This was written with the Sega Saturn (SMP SH-2 7604) in mind, - * but is designed to be usable regardless if there's an MMU - * present or not. - */ -struct sh_cpuinfo cpu_data[NR_CPUS]; - -extern void per_cpu_trap_init(void); +int __cpu_number_map[NR_CPUS]; /* Map physical to logical */ +int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */ cpumask_t cpu_possible_map; EXPORT_SYMBOL(cpu_possible_map); cpumask_t cpu_online_map; EXPORT_SYMBOL(cpu_online_map); -static atomic_t cpus_booted = ATOMIC_INIT(0); - -/* 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. - */ -void __smp_send_ipi(unsigned int cpu, unsigned int action); - -/* - * Find the number of available processors - */ -unsigned int __smp_probe_cpus(void); - -/* - * Start a particular processor - */ -void __smp_slave_init(unsigned int cpu); +static atomic_t cpus_booted = ATOMIC_INIT(0); /* * Run specified function on a particular processor. @@ -73,74 +45,123 @@ void __smp_call_function(unsigned int cpu); static inline void __init smp_store_cpu_info(unsigned int cpu) { - cpu_data[cpu].loops_per_jiffy = loops_per_jiffy; + struct sh_cpuinfo *c = cpu_data + cpu; + + c->loops_per_jiffy = loops_per_jiffy; } void __init smp_prepare_cpus(unsigned int max_cpus) { unsigned int cpu = smp_processor_id(); - int i; - atomic_set(&cpus_booted, 1); - smp_store_cpu_info(cpu); - - for (i = 0; i < __smp_probe_cpus(); i++) - cpu_set(i, cpu_possible_map); + init_new_context(current, &init_mm); + current_thread_info()->cpu = cpu; + plat_prepare_cpus(max_cpus); + +#ifndef CONFIG_HOTPLUG_CPU + cpu_present_map = cpu_possible_map; +#endif } void __devinit smp_prepare_boot_cpu(void) { unsigned int cpu = smp_processor_id(); + __cpu_number_map[0] = cpu; + __cpu_logical_map[0] = cpu; + cpu_set(cpu, cpu_online_map); cpu_set(cpu, cpu_possible_map); } -int __cpu_up(unsigned int cpu) +asmlinkage void __cpuinit start_secondary(void) { - struct task_struct *tsk; + unsigned int cpu; + struct mm_struct *mm = &init_mm; - tsk = fork_idle(cpu); + atomic_inc(&mm->mm_count); + atomic_inc(&mm->mm_users); + current->active_mm = mm; + BUG_ON(current->mm); + enter_lazy_tlb(mm, current); + + per_cpu_trap_init(); - if (IS_ERR(tsk)) - panic("Failed forking idle task for cpu %d\n", cpu); - - task_thread_info(tsk)->cpu = cpu; + preempt_disable(); + + local_irq_enable(); + + calibrate_delay(); + + cpu = smp_processor_id(); + smp_store_cpu_info(cpu); cpu_set(cpu, cpu_online_map); - return 0; + cpu_idle(); } -int start_secondary(void *unused) +extern struct { + unsigned long sp; + unsigned long bss_start; + unsigned long bss_end; + void *start_kernel_fn; + void *cpu_init_fn; + void *thread_info; +} stack_start; + +int __cpuinit __cpu_up(unsigned int cpu) { - unsigned int cpu; + struct task_struct *tsk; + unsigned long timeout; - cpu = smp_processor_id(); + tsk = fork_idle(cpu); + if (IS_ERR(tsk)) { + printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu); + return PTR_ERR(tsk); + } - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; + /* Fill in data in head.S for secondary cpus */ + stack_start.sp = tsk->thread.sp; + stack_start.thread_info = tsk->stack; + stack_start.bss_start = 0; /* don't clear bss for secondary cpus */ + stack_start.start_kernel_fn = start_secondary; - smp_store_cpu_info(cpu); + flush_cache_all(); - __smp_slave_init(cpu); - preempt_disable(); - per_cpu_trap_init(); - - atomic_inc(&cpus_booted); + plat_start_cpu(cpu, (unsigned long)_stext); - cpu_idle(); - return 0; + timeout = jiffies + HZ; + while (time_before(jiffies, timeout)) { + if (cpu_online(cpu)) + break; + + udelay(10); + } + + if (cpu_online(cpu)) + return 0; + + return -ENOENT; } void __init smp_cpus_done(unsigned int max_cpus) { - smp_mb(); + unsigned long bogosum = 0; + int cpu; + + for_each_online_cpu(cpu) + bogosum += cpu_data[cpu].loops_per_jiffy; + + printk(KERN_INFO "SMP: Total of %d processors activated " + "(%lu.%02lu BogoMIPS).\n", num_online_cpus(), + bogosum / (500000/HZ), + (bogosum / (5000/HZ)) % 100); } void smp_send_reschedule(int cpu) { - __smp_send_ipi(cpu, SMP_MSG_RESCHEDULE); + plat_send_ipi(cpu, SMP_MSG_RESCHEDULE); } static void stop_this_cpu(void *unused) @@ -157,7 +178,6 @@ void smp_send_stop(void) smp_call_function(stop_this_cpu, 0, 1, 0); } - struct smp_fn_call_struct smp_fn_call = { .lock = SPIN_LOCK_UNLOCKED, .finished = ATOMIC_INIT(0), @@ -175,9 +195,6 @@ int smp_call_function(void (*func)(void *info), void *info, int retry, int wait) unsigned int nr_cpus = atomic_read(&cpus_booted); int i; - if (nr_cpus < 2) - return 0; - /* Can deadlock when called with interrupts disabled */ WARN_ON(irqs_disabled()); @@ -189,7 +206,7 @@ int smp_call_function(void (*func)(void *info), void *info, int retry, int wait) for (i = 0; i < nr_cpus; i++) if (i != smp_processor_id()) - __smp_call_function(i); + plat_send_ipi(i, SMP_MSG_FUNCTION); if (wait) while (atomic_read(&smp_fn_call.finished) != (nr_cpus - 1)); |
