2005-04-17 05:20:36 +07:00
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/*
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* arch/sh/kernel/smp.c
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*
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* SMP support for the SuperH processors.
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*
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2010-03-30 10:38:01 +07:00
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* Copyright (C) 2002 - 2010 Paul Mundt
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2007-09-21 16:32:32 +07:00
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* Copyright (C) 2006 - 2007 Akio Idehara
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2005-04-17 05:20:36 +07:00
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*
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2007-09-21 16:32:32 +07:00
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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2005-04-17 05:20:36 +07:00
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*/
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2007-05-31 11:46:21 +07:00
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#include <linux/err.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/cache.h>
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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2007-09-21 16:32:32 +07:00
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#include <linux/mm.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/module.h>
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2008-10-21 10:39:24 +07:00
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#include <linux/cpu.h>
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2007-09-21 16:32:32 +07:00
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#include <linux/interrupt.h>
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2011-04-05 22:23:39 +07:00
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#include <linux/sched.h>
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2011-07-27 06:09:06 +07:00
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#include <linux/atomic.h>
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2005-04-17 05:20:36 +07:00
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/mmu_context.h>
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#include <asm/smp.h>
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2007-09-21 16:32:32 +07:00
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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2005-04-17 05:20:36 +07:00
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2007-09-21 16:32:32 +07:00
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int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
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int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
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2005-04-17 05:20:36 +07:00
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2010-03-30 10:38:01 +07:00
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struct plat_smp_ops *mp_ops = NULL;
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2010-04-26 16:49:58 +07:00
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/* State of each CPU */
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DEFINE_PER_CPU(int, cpu_state) = { 0 };
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2010-03-30 10:38:01 +07:00
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void __cpuinit register_smp_ops(struct plat_smp_ops *ops)
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{
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if (mp_ops)
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printk(KERN_WARNING "Overriding previously set SMP ops\n");
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mp_ops = ops;
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}
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2010-04-26 16:55:01 +07:00
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static inline void __cpuinit smp_store_cpu_info(unsigned int cpu)
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2005-04-17 05:20:36 +07:00
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{
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2007-09-21 16:32:32 +07:00
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struct sh_cpuinfo *c = cpu_data + cpu;
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2009-10-14 12:14:30 +07:00
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memcpy(c, &boot_cpu_data, sizeof(struct sh_cpuinfo));
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2007-09-21 16:32:32 +07:00
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c->loops_per_jiffy = loops_per_jiffy;
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2005-04-17 05:20:36 +07:00
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}
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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unsigned int cpu = smp_processor_id();
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2007-09-21 16:32:32 +07:00
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init_new_context(current, &init_mm);
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current_thread_info()->cpu = cpu;
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2010-03-30 10:38:01 +07:00
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mp_ops->prepare_cpus(max_cpus);
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2007-09-21 16:32:32 +07:00
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#ifndef CONFIG_HOTPLUG_CPU
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2009-06-12 20:03:14 +07:00
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init_cpu_present(&cpu_possible_map);
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2007-09-21 16:32:32 +07:00
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#endif
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2005-04-17 05:20:36 +07:00
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}
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2010-04-26 16:55:01 +07:00
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void __init smp_prepare_boot_cpu(void)
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2005-04-17 05:20:36 +07:00
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{
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unsigned int cpu = smp_processor_id();
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2007-09-21 16:32:32 +07:00
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__cpu_number_map[0] = cpu;
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__cpu_logical_map[0] = cpu;
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2009-06-12 20:03:14 +07:00
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set_cpu_online(cpu, true);
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set_cpu_possible(cpu, true);
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2010-04-26 16:49:58 +07:00
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per_cpu(cpu_state, cpu) = CPU_ONLINE;
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2005-04-17 05:20:36 +07:00
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}
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2010-04-26 17:08:55 +07:00
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#ifdef CONFIG_HOTPLUG_CPU
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void native_cpu_die(unsigned int cpu)
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{
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unsigned int i;
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for (i = 0; i < 10; i++) {
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smp_rmb();
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if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
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if (system_state == SYSTEM_RUNNING)
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pr_info("CPU %u is now offline\n", cpu);
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return;
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}
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msleep(100);
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}
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pr_err("CPU %u didn't die...\n", cpu);
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}
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int native_cpu_disable(unsigned int cpu)
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{
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return cpu == 0 ? -EPERM : 0;
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}
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void play_dead_common(void)
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{
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idle_task_exit();
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irq_ctx_exit(raw_smp_processor_id());
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mb();
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__get_cpu_var(cpu_state) = CPU_DEAD;
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local_irq_disable();
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}
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void native_play_dead(void)
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{
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play_dead_common();
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}
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int __cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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struct task_struct *p;
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int ret;
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ret = mp_ops->cpu_disable(cpu);
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if (ret)
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return ret;
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/*
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* Take this CPU offline. Once we clear this, we can't return,
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* and we must not schedule until we're ready to give up the cpu.
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*/
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set_cpu_online(cpu, false);
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/*
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* OK - migrate IRQs away from this CPU
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*/
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migrate_irqs();
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/*
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* Stop the local timer for this CPU.
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*/
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local_timer_stop(cpu);
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/*
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* Flush user cache and TLB mappings, and then remove this CPU
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* from the vm mask set of all processes.
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*/
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flush_cache_all();
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local_flush_tlb_all();
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read_lock(&tasklist_lock);
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for_each_process(p)
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if (p->mm)
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cpumask_clear_cpu(cpu, mm_cpumask(p->mm));
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read_unlock(&tasklist_lock);
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return 0;
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}
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#else /* ... !CONFIG_HOTPLUG_CPU */
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2010-04-28 18:11:30 +07:00
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int native_cpu_disable(unsigned int cpu)
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2010-04-26 17:08:55 +07:00
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{
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return -ENOSYS;
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}
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void native_cpu_die(unsigned int cpu)
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{
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/* We said "no" in __cpu_disable */
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BUG();
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}
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void native_play_dead(void)
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{
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BUG();
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}
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#endif
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2007-09-21 16:32:32 +07:00
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asmlinkage void __cpuinit start_secondary(void)
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2005-04-17 05:20:36 +07:00
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{
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2010-04-26 16:49:58 +07:00
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unsigned int cpu = smp_processor_id();
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2007-09-21 16:32:32 +07:00
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struct mm_struct *mm = &init_mm;
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2005-04-17 05:20:36 +07:00
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2010-03-29 03:08:25 +07:00
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enable_mmu();
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2007-09-21 16:32:32 +07:00
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atomic_inc(&mm->mm_count);
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atomic_inc(&mm->mm_users);
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current->active_mm = mm;
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enter_lazy_tlb(mm, current);
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2010-04-26 17:08:55 +07:00
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local_flush_tlb_all();
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2007-09-21 16:32:32 +07:00
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per_cpu_trap_init();
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preempt_disable();
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2010-04-26 16:49:58 +07:00
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notify_cpu_starting(cpu);
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2008-09-07 21:57:22 +07:00
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2007-09-21 16:32:32 +07:00
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local_irq_enable();
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2005-04-17 05:20:36 +07:00
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2008-08-06 16:37:07 +07:00
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/* Enable local timers */
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local_timer_setup(cpu);
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2007-09-21 16:32:32 +07:00
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calibrate_delay();
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smp_store_cpu_info(cpu);
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2005-04-17 05:20:36 +07:00
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2010-04-26 16:39:50 +07:00
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set_cpu_online(cpu, true);
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2010-04-26 16:49:58 +07:00
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per_cpu(cpu_state, cpu) = CPU_ONLINE;
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2005-04-17 05:20:36 +07:00
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2007-09-21 16:32:32 +07:00
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cpu_idle();
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2005-04-17 05:20:36 +07:00
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}
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2007-09-21 16:32:32 +07:00
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extern struct {
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unsigned long sp;
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unsigned long bss_start;
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unsigned long bss_end;
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void *start_kernel_fn;
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void *cpu_init_fn;
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void *thread_info;
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} stack_start;
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int __cpuinit __cpu_up(unsigned int cpu)
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2005-04-17 05:20:36 +07:00
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{
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2007-09-21 16:32:32 +07:00
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struct task_struct *tsk;
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unsigned long timeout;
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2005-11-09 12:39:01 +07:00
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2010-04-26 16:59:47 +07:00
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tsk = cpu_data[cpu].idle;
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if (!tsk) {
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tsk = fork_idle(cpu);
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if (IS_ERR(tsk)) {
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pr_err("Failed forking idle task for cpu %d\n", cpu);
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return PTR_ERR(tsk);
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}
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cpu_data[cpu].idle = tsk;
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2007-09-21 16:32:32 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2010-04-26 16:49:58 +07:00
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per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
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2007-09-21 16:32:32 +07:00
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/* Fill in data in head.S for secondary cpus */
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stack_start.sp = tsk->thread.sp;
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stack_start.thread_info = tsk->stack;
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stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
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stack_start.start_kernel_fn = start_secondary;
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2005-04-17 05:20:36 +07:00
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2009-10-14 09:51:28 +07:00
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flush_icache_range((unsigned long)&stack_start,
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(unsigned long)&stack_start + sizeof(stack_start));
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wmb();
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2005-04-17 05:20:36 +07:00
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2010-03-30 10:38:01 +07:00
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mp_ops->start_cpu(cpu, (unsigned long)_stext);
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2005-04-17 05:20:36 +07:00
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2007-09-21 16:32:32 +07:00
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timeout = jiffies + HZ;
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while (time_before(jiffies, timeout)) {
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if (cpu_online(cpu))
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break;
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udelay(10);
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2010-04-26 17:08:55 +07:00
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barrier();
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2007-09-21 16:32:32 +07:00
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}
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if (cpu_online(cpu))
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return 0;
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return -ENOENT;
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2005-04-17 05:20:36 +07:00
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}
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void __init smp_cpus_done(unsigned int max_cpus)
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{
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2007-09-21 16:32:32 +07:00
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unsigned long bogosum = 0;
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int cpu;
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for_each_online_cpu(cpu)
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bogosum += cpu_data[cpu].loops_per_jiffy;
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printk(KERN_INFO "SMP: Total of %d processors activated "
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"(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
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bogosum / (500000/HZ),
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(bogosum / (5000/HZ)) % 100);
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2005-04-17 05:20:36 +07:00
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}
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void smp_send_reschedule(int cpu)
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{
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2010-03-30 10:38:01 +07:00
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mp_ops->send_ipi(cpu, SMP_MSG_RESCHEDULE);
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2005-04-17 05:20:36 +07:00
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}
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void smp_send_stop(void)
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{
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2008-06-06 16:18:06 +07:00
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smp_call_function(stop_this_cpu, 0, 0);
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2005-04-17 05:20:36 +07:00
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}
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2009-06-12 20:02:35 +07:00
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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2005-04-17 05:20:36 +07:00
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{
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2008-06-11 01:52:59 +07:00
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int cpu;
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2005-04-17 05:20:36 +07:00
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2009-06-12 20:02:35 +07:00
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for_each_cpu(cpu, mask)
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2010-03-30 10:38:01 +07:00
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mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION);
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2008-06-11 01:52:59 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2008-06-11 01:52:59 +07:00
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void arch_send_call_function_single_ipi(int cpu)
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{
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2010-03-30 10:38:01 +07:00
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mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
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2005-04-17 05:20:36 +07:00
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}
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2008-12-13 17:50:26 +07:00
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void smp_timer_broadcast(const struct cpumask *mask)
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2008-08-06 16:21:03 +07:00
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{
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int cpu;
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2008-12-13 17:50:26 +07:00
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for_each_cpu(cpu, mask)
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2010-03-30 10:38:01 +07:00
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mp_ops->send_ipi(cpu, SMP_MSG_TIMER);
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2008-08-06 16:21:03 +07:00
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}
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static void ipi_timer(void)
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{
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irq_enter();
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2008-08-06 16:37:07 +07:00
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local_timer_interrupt();
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2008-08-06 16:21:03 +07:00
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irq_exit();
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}
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2008-08-06 16:02:48 +07:00
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void smp_message_recv(unsigned int msg)
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{
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switch (msg) {
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case SMP_MSG_FUNCTION:
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|
|
generic_smp_call_function_interrupt();
|
|
|
|
break;
|
|
|
|
case SMP_MSG_RESCHEDULE:
|
2011-04-05 22:23:39 +07:00
|
|
|
scheduler_ipi();
|
2008-08-06 16:02:48 +07:00
|
|
|
break;
|
|
|
|
case SMP_MSG_FUNCTION_SINGLE:
|
|
|
|
generic_smp_call_function_single_interrupt();
|
|
|
|
break;
|
2008-08-06 16:21:03 +07:00
|
|
|
case SMP_MSG_TIMER:
|
|
|
|
ipi_timer();
|
|
|
|
break;
|
2008-08-06 16:02:48 +07:00
|
|
|
default:
|
|
|
|
printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
|
|
|
|
smp_processor_id(), __func__, msg);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-04-17 05:20:36 +07:00
|
|
|
/* Not really SMP stuff ... */
|
|
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-09-21 16:09:55 +07:00
|
|
|
static void flush_tlb_all_ipi(void *info)
|
|
|
|
{
|
|
|
|
local_flush_tlb_all();
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_tlb_all(void)
|
|
|
|
{
|
2008-05-09 14:39:44 +07:00
|
|
|
on_each_cpu(flush_tlb_all_ipi, 0, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void flush_tlb_mm_ipi(void *mm)
|
|
|
|
{
|
|
|
|
local_flush_tlb_mm((struct mm_struct *)mm);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The following tlb flush calls are invoked when old translations are
|
|
|
|
* being torn down, or pte attributes are changing. For single threaded
|
|
|
|
* address spaces, a new context is obtained on the current cpu, and tlb
|
|
|
|
* context on other cpus are invalidated to force a new context allocation
|
|
|
|
* at switch_mm time, should the mm ever be used on other cpus. For
|
|
|
|
* multithreaded address spaces, intercpu interrupts have to be sent.
|
|
|
|
* Another case where intercpu interrupts are required is when the target
|
|
|
|
* mm might be active on another cpu (eg debuggers doing the flushes on
|
|
|
|
* behalf of debugees, kswapd stealing pages from another process etc).
|
|
|
|
* Kanoj 07/00.
|
|
|
|
*/
|
|
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
|
|
|
{
|
|
|
|
preempt_disable();
|
|
|
|
|
|
|
|
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
|
2008-06-06 16:18:06 +07:00
|
|
|
smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
} else {
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < num_online_cpus(); i++)
|
|
|
|
if (smp_processor_id() != i)
|
|
|
|
cpu_context(i, mm) = 0;
|
|
|
|
}
|
|
|
|
local_flush_tlb_mm(mm);
|
|
|
|
|
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
|
|
|
struct flush_tlb_data {
|
|
|
|
struct vm_area_struct *vma;
|
|
|
|
unsigned long addr1;
|
|
|
|
unsigned long addr2;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void flush_tlb_range_ipi(void *info)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
|
|
|
|
|
|
|
|
local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_tlb_range(struct vm_area_struct *vma,
|
|
|
|
unsigned long start, unsigned long end)
|
|
|
|
{
|
|
|
|
struct mm_struct *mm = vma->vm_mm;
|
|
|
|
|
|
|
|
preempt_disable();
|
|
|
|
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
|
|
|
|
struct flush_tlb_data fd;
|
|
|
|
|
|
|
|
fd.vma = vma;
|
|
|
|
fd.addr1 = start;
|
|
|
|
fd.addr2 = end;
|
2008-06-06 16:18:06 +07:00
|
|
|
smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
} else {
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < num_online_cpus(); i++)
|
|
|
|
if (smp_processor_id() != i)
|
|
|
|
cpu_context(i, mm) = 0;
|
|
|
|
}
|
|
|
|
local_flush_tlb_range(vma, start, end);
|
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void flush_tlb_kernel_range_ipi(void *info)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
|
|
|
|
|
|
|
|
local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data fd;
|
|
|
|
|
|
|
|
fd.addr1 = start;
|
|
|
|
fd.addr2 = end;
|
2008-05-09 14:39:44 +07:00
|
|
|
on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void flush_tlb_page_ipi(void *info)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
|
|
|
|
|
|
|
|
local_flush_tlb_page(fd->vma, fd->addr1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
|
|
|
|
{
|
|
|
|
preempt_disable();
|
|
|
|
if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
|
|
|
|
(current->mm != vma->vm_mm)) {
|
|
|
|
struct flush_tlb_data fd;
|
|
|
|
|
|
|
|
fd.vma = vma;
|
|
|
|
fd.addr1 = page;
|
2008-06-06 16:18:06 +07:00
|
|
|
smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
} else {
|
|
|
|
int i;
|
|
|
|
for (i = 0; i < num_online_cpus(); i++)
|
|
|
|
if (smp_processor_id() != i)
|
|
|
|
cpu_context(i, vma->vm_mm) = 0;
|
|
|
|
}
|
|
|
|
local_flush_tlb_page(vma, page);
|
|
|
|
preempt_enable();
|
|
|
|
}
|
|
|
|
|
|
|
|
static void flush_tlb_one_ipi(void *info)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
|
|
|
|
local_flush_tlb_one(fd->addr1, fd->addr2);
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_tlb_one(unsigned long asid, unsigned long vaddr)
|
|
|
|
{
|
|
|
|
struct flush_tlb_data fd;
|
|
|
|
|
|
|
|
fd.addr1 = asid;
|
|
|
|
fd.addr2 = vaddr;
|
|
|
|
|
2008-06-06 16:18:06 +07:00
|
|
|
smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
|
2007-09-21 16:09:55 +07:00
|
|
|
local_flush_tlb_one(asid, vaddr);
|
|
|
|
}
|