![Russell King](/assets/img/avatar_default.png)
This allows the backtrace to dump the exception stack contents. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
760 lines
15 KiB
C
760 lines
15 KiB
C
/*
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* linux/arch/arm/kernel/smp.c
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*
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* Copyright (C) 2002 ARM Limited, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.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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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/cache.h>
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#include <linux/profile.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/smp.h>
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#include <linux/seq_file.h>
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#include <linux/irq.h>
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#include <asm/atomic.h>
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#include <asm/cacheflush.h>
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#include <asm/cpu.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/processor.h>
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#include <asm/tlbflush.h>
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#include <asm/ptrace.h>
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/*
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* bitmask of present and online CPUs.
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* The present bitmask indicates that the CPU is physically present.
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* The online bitmask indicates that the CPU is up and running.
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*/
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cpumask_t cpu_possible_map;
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EXPORT_SYMBOL(cpu_possible_map);
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cpumask_t cpu_online_map;
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EXPORT_SYMBOL(cpu_online_map);
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/*
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* as from 2.5, kernels no longer have an init_tasks structure
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* so we need some other way of telling a new secondary core
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* where to place its SVC stack
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*/
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struct secondary_data secondary_data;
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/*
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* structures for inter-processor calls
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* - A collection of single bit ipi messages.
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*/
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struct ipi_data {
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spinlock_t lock;
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unsigned long ipi_count;
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unsigned long bits;
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};
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static DEFINE_PER_CPU(struct ipi_data, ipi_data) = {
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.lock = SPIN_LOCK_UNLOCKED,
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};
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enum ipi_msg_type {
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IPI_TIMER,
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IPI_RESCHEDULE,
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IPI_CALL_FUNC,
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IPI_CPU_STOP,
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};
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struct smp_call_struct {
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void (*func)(void *info);
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void *info;
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int wait;
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cpumask_t pending;
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cpumask_t unfinished;
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};
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static struct smp_call_struct * volatile smp_call_function_data;
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static DEFINE_SPINLOCK(smp_call_function_lock);
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int __cpuinit __cpu_up(unsigned int cpu)
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{
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struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
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struct task_struct *idle = ci->idle;
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pgd_t *pgd;
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pmd_t *pmd;
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int ret;
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/*
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* Spawn a new process manually, if not already done.
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* Grab a pointer to its task struct so we can mess with it
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*/
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if (!idle) {
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idle = fork_idle(cpu);
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if (IS_ERR(idle)) {
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printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
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return PTR_ERR(idle);
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}
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ci->idle = idle;
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}
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/*
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* Allocate initial page tables to allow the new CPU to
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* enable the MMU safely. This essentially means a set
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* of our "standard" page tables, with the addition of
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* a 1:1 mapping for the physical address of the kernel.
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*/
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pgd = pgd_alloc(&init_mm);
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pmd = pmd_offset(pgd, PHYS_OFFSET);
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*pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) |
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PMD_TYPE_SECT | PMD_SECT_AP_WRITE);
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/*
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* We need to tell the secondary core where to find
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* its stack and the page tables.
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*/
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secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
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secondary_data.pgdir = virt_to_phys(pgd);
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wmb();
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/*
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* Now bring the CPU into our world.
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*/
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ret = boot_secondary(cpu, idle);
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if (ret == 0) {
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unsigned long timeout;
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/*
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* CPU was successfully started, wait for it
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* to come online or time out.
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*/
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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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barrier();
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}
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if (!cpu_online(cpu))
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ret = -EIO;
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}
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secondary_data.stack = NULL;
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secondary_data.pgdir = 0;
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*pmd_offset(pgd, PHYS_OFFSET) = __pmd(0);
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pgd_free(pgd);
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if (ret) {
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printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu);
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/*
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* FIXME: We need to clean up the new idle thread. --rmk
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*/
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}
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return ret;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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/*
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* __cpu_disable runs on the processor to be shutdown.
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*/
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int __cpuexit __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 = mach_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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cpu_clear(cpu, cpu_online_map);
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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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cpu_clear(cpu, p->mm->cpu_vm_mask);
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}
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read_unlock(&tasklist_lock);
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return 0;
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}
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/*
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* called on the thread which is asking for a CPU to be shutdown -
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* waits until shutdown has completed, or it is timed out.
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*/
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void __cpuexit __cpu_die(unsigned int cpu)
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{
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if (!platform_cpu_kill(cpu))
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printk("CPU%u: unable to kill\n", cpu);
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}
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/*
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* Called from the idle thread for the CPU which has been shutdown.
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*
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* Note that we disable IRQs here, but do not re-enable them
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* before returning to the caller. This is also the behaviour
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* of the other hotplug-cpu capable cores, so presumably coming
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* out of idle fixes this.
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*/
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void __cpuexit cpu_die(void)
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{
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unsigned int cpu = smp_processor_id();
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local_irq_disable();
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idle_task_exit();
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/*
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* actual CPU shutdown procedure is at least platform (if not
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* CPU) specific
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*/
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platform_cpu_die(cpu);
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/*
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* Do not return to the idle loop - jump back to the secondary
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* cpu initialisation. There's some initialisation which needs
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* to be repeated to undo the effects of taking the CPU offline.
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*/
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__asm__("mov sp, %0\n"
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" b secondary_start_kernel"
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:
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: "r" (task_stack_page(current) + THREAD_SIZE - 8));
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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/*
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* This is the secondary CPU boot entry. We're using this CPUs
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* idle thread stack, but a set of temporary page tables.
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*/
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asmlinkage void __cpuinit secondary_start_kernel(void)
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{
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struct mm_struct *mm = &init_mm;
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unsigned int cpu = smp_processor_id();
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printk("CPU%u: Booted secondary processor\n", cpu);
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/*
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* All kernel threads share the same mm context; grab a
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* reference and switch to it.
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*/
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atomic_inc(&mm->mm_users);
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atomic_inc(&mm->mm_count);
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current->active_mm = mm;
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cpu_set(cpu, mm->cpu_vm_mask);
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cpu_switch_mm(mm->pgd, mm);
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enter_lazy_tlb(mm, current);
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local_flush_tlb_all();
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cpu_init();
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preempt_disable();
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/*
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* Give the platform a chance to do its own initialisation.
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*/
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platform_secondary_init(cpu);
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/*
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* Enable local interrupts.
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*/
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local_irq_enable();
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local_fiq_enable();
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calibrate_delay();
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smp_store_cpu_info(cpu);
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/*
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* OK, now it's safe to let the boot CPU continue
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*/
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cpu_set(cpu, cpu_online_map);
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/*
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* Setup local timer for this CPU.
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*/
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local_timer_setup(cpu);
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/*
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* OK, it's off to the idle thread for us
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*/
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cpu_idle();
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}
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/*
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* Called by both boot and secondaries to move global data into
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* per-processor storage.
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*/
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void __cpuinit smp_store_cpu_info(unsigned int cpuid)
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{
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struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
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cpu_info->loops_per_jiffy = loops_per_jiffy;
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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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int cpu;
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unsigned long bogosum = 0;
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for_each_online_cpu(cpu)
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bogosum += per_cpu(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",
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num_online_cpus(),
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bogosum / (500000/HZ),
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(bogosum / (5000/HZ)) % 100);
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}
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void __init smp_prepare_boot_cpu(void)
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{
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unsigned int cpu = smp_processor_id();
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per_cpu(cpu_data, cpu).idle = current;
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}
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static void send_ipi_message(cpumask_t callmap, enum ipi_msg_type msg)
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{
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unsigned long flags;
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unsigned int cpu;
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local_irq_save(flags);
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for_each_cpu_mask(cpu, callmap) {
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struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
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spin_lock(&ipi->lock);
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ipi->bits |= 1 << msg;
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spin_unlock(&ipi->lock);
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}
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/*
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* Call the platform specific cross-CPU call function.
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*/
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smp_cross_call(callmap);
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local_irq_restore(flags);
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}
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/*
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* You must not call this function with disabled interrupts, from a
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* hardware interrupt handler, nor from a bottom half handler.
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*/
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static int smp_call_function_on_cpu(void (*func)(void *info), void *info,
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int retry, int wait, cpumask_t callmap)
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{
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struct smp_call_struct data;
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unsigned long timeout;
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int ret = 0;
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data.func = func;
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data.info = info;
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data.wait = wait;
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cpu_clear(smp_processor_id(), callmap);
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if (cpus_empty(callmap))
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goto out;
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data.pending = callmap;
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if (wait)
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data.unfinished = callmap;
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/*
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* try to get the mutex on smp_call_function_data
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*/
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spin_lock(&smp_call_function_lock);
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smp_call_function_data = &data;
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send_ipi_message(callmap, IPI_CALL_FUNC);
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timeout = jiffies + HZ;
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while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
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barrier();
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/*
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* did we time out?
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*/
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if (!cpus_empty(data.pending)) {
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/*
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* this may be causing our panic - report it
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*/
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printk(KERN_CRIT
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"CPU%u: smp_call_function timeout for %p(%p)\n"
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" callmap %lx pending %lx, %swait\n",
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smp_processor_id(), func, info, *cpus_addr(callmap),
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*cpus_addr(data.pending), wait ? "" : "no ");
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/*
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* TRACE
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*/
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timeout = jiffies + (5 * HZ);
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while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
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barrier();
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if (cpus_empty(data.pending))
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printk(KERN_CRIT " RESOLVED\n");
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else
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printk(KERN_CRIT " STILL STUCK\n");
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}
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/*
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* whatever happened, we're done with the data, so release it
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*/
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smp_call_function_data = NULL;
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spin_unlock(&smp_call_function_lock);
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if (!cpus_empty(data.pending)) {
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ret = -ETIMEDOUT;
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goto out;
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}
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if (wait)
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while (!cpus_empty(data.unfinished))
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barrier();
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out:
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return 0;
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}
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int smp_call_function(void (*func)(void *info), void *info, int retry,
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int wait)
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{
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return smp_call_function_on_cpu(func, info, retry, wait,
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cpu_online_map);
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}
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EXPORT_SYMBOL_GPL(smp_call_function);
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void show_ipi_list(struct seq_file *p)
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{
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unsigned int cpu;
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seq_puts(p, "IPI:");
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for_each_present_cpu(cpu)
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seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count);
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seq_putc(p, '\n');
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}
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void show_local_irqs(struct seq_file *p)
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{
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unsigned int cpu;
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seq_printf(p, "LOC: ");
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for_each_present_cpu(cpu)
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seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs);
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seq_putc(p, '\n');
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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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profile_tick(CPU_PROFILING);
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update_process_times(user_mode(get_irq_regs()));
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irq_exit();
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}
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#ifdef CONFIG_LOCAL_TIMERS
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asmlinkage void __exception do_local_timer(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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int cpu = smp_processor_id();
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if (local_timer_ack()) {
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irq_stat[cpu].local_timer_irqs++;
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ipi_timer();
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}
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set_irq_regs(old_regs);
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}
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#endif
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/*
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* ipi_call_function - handle IPI from smp_call_function()
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*
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* Note that we copy data out of the cross-call structure and then
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* let the caller know that we're here and have done with their data
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*/
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static void ipi_call_function(unsigned int cpu)
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{
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struct smp_call_struct *data = smp_call_function_data;
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void (*func)(void *info) = data->func;
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void *info = data->info;
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int wait = data->wait;
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cpu_clear(cpu, data->pending);
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func(info);
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if (wait)
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cpu_clear(cpu, data->unfinished);
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}
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static DEFINE_SPINLOCK(stop_lock);
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/*
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* ipi_cpu_stop - handle IPI from smp_send_stop()
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*/
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static void ipi_cpu_stop(unsigned int cpu)
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{
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spin_lock(&stop_lock);
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printk(KERN_CRIT "CPU%u: stopping\n", cpu);
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dump_stack();
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spin_unlock(&stop_lock);
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cpu_clear(cpu, cpu_online_map);
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local_fiq_disable();
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local_irq_disable();
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while (1)
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cpu_relax();
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}
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/*
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* Main handler for inter-processor interrupts
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*
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* For ARM, the ipimask now only identifies a single
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* category of IPI (Bit 1 IPIs have been replaced by a
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* different mechanism):
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*
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* Bit 0 - Inter-processor function call
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*/
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asmlinkage void __exception do_IPI(struct pt_regs *regs)
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{
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unsigned int cpu = smp_processor_id();
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struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
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struct pt_regs *old_regs = set_irq_regs(regs);
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ipi->ipi_count++;
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for (;;) {
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unsigned long msgs;
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spin_lock(&ipi->lock);
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msgs = ipi->bits;
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ipi->bits = 0;
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spin_unlock(&ipi->lock);
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if (!msgs)
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break;
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|
|
do {
|
|
unsigned nextmsg;
|
|
|
|
nextmsg = msgs & -msgs;
|
|
msgs &= ~nextmsg;
|
|
nextmsg = ffz(~nextmsg);
|
|
|
|
switch (nextmsg) {
|
|
case IPI_TIMER:
|
|
ipi_timer();
|
|
break;
|
|
|
|
case IPI_RESCHEDULE:
|
|
/*
|
|
* nothing more to do - eveything is
|
|
* done on the interrupt return path
|
|
*/
|
|
break;
|
|
|
|
case IPI_CALL_FUNC:
|
|
ipi_call_function(cpu);
|
|
break;
|
|
|
|
case IPI_CPU_STOP:
|
|
ipi_cpu_stop(cpu);
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
|
|
cpu, nextmsg);
|
|
break;
|
|
}
|
|
} while (msgs);
|
|
}
|
|
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
{
|
|
send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE);
|
|
}
|
|
|
|
void smp_send_timer(void)
|
|
{
|
|
cpumask_t mask = cpu_online_map;
|
|
cpu_clear(smp_processor_id(), mask);
|
|
send_ipi_message(mask, IPI_TIMER);
|
|
}
|
|
|
|
void smp_send_stop(void)
|
|
{
|
|
cpumask_t mask = cpu_online_map;
|
|
cpu_clear(smp_processor_id(), mask);
|
|
send_ipi_message(mask, IPI_CPU_STOP);
|
|
}
|
|
|
|
/*
|
|
* not supported here
|
|
*/
|
|
int __init setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int
|
|
on_each_cpu_mask(void (*func)(void *), void *info, int retry, int wait,
|
|
cpumask_t mask)
|
|
{
|
|
int ret = 0;
|
|
|
|
preempt_disable();
|
|
|
|
ret = smp_call_function_on_cpu(func, info, retry, wait, mask);
|
|
if (cpu_isset(smp_processor_id(), mask))
|
|
func(info);
|
|
|
|
preempt_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* TLB operations
|
|
*/
|
|
struct tlb_args {
|
|
struct vm_area_struct *ta_vma;
|
|
unsigned long ta_start;
|
|
unsigned long ta_end;
|
|
};
|
|
|
|
static inline void ipi_flush_tlb_all(void *ignored)
|
|
{
|
|
local_flush_tlb_all();
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_mm(void *arg)
|
|
{
|
|
struct mm_struct *mm = (struct mm_struct *)arg;
|
|
|
|
local_flush_tlb_mm(mm);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_page(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_page(ta->ta_vma, ta->ta_start);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_kernel_page(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_kernel_page(ta->ta_start);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_range(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
|
|
}
|
|
|
|
static inline void ipi_flush_tlb_kernel_range(void *arg)
|
|
{
|
|
struct tlb_args *ta = (struct tlb_args *)arg;
|
|
|
|
local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
|
|
}
|
|
|
|
void flush_tlb_all(void)
|
|
{
|
|
on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1);
|
|
}
|
|
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
cpumask_t mask = mm->cpu_vm_mask;
|
|
|
|
on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, 1, mask);
|
|
}
|
|
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
|
|
{
|
|
cpumask_t mask = vma->vm_mm->cpu_vm_mask;
|
|
struct tlb_args ta;
|
|
|
|
ta.ta_vma = vma;
|
|
ta.ta_start = uaddr;
|
|
|
|
on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, 1, mask);
|
|
}
|
|
|
|
void flush_tlb_kernel_page(unsigned long kaddr)
|
|
{
|
|
struct tlb_args ta;
|
|
|
|
ta.ta_start = kaddr;
|
|
|
|
on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1, 1);
|
|
}
|
|
|
|
void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
cpumask_t mask = vma->vm_mm->cpu_vm_mask;
|
|
struct tlb_args ta;
|
|
|
|
ta.ta_vma = vma;
|
|
ta.ta_start = start;
|
|
ta.ta_end = end;
|
|
|
|
on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, 1, mask);
|
|
}
|
|
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
{
|
|
struct tlb_args ta;
|
|
|
|
ta.ta_start = start;
|
|
ta.ta_end = end;
|
|
|
|
on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1, 1);
|
|
}
|