![Russell King](/assets/img/avatar_default.png)
Fix: WARNING: vmlinux.o(.text+0x247c): Section mismatch in reference from the function cpu_idle() to the function .cpuexit.text:cpu_die() The function cpu_idle() references a function in an exit section. Often the function cpu_die() has valid usage outside the exit section and the fix is to remove the __cpuexit annotation of cpu_die. WARNING: vmlinux.o(.cpuexit.text+0x3c): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel() The function __cpuexit cpu_die() references a function __cpuinit secondary_start_kernel(). This is often seen when error handling in the exit function uses functionality in the init path. The fix is often to remove the __cpuinit annotation of secondary_start_kernel() so it may be used outside an init section. Sam says: > The annotation of cpu_die() is wrong. > To be annotated __cpuexit the function shall: > - be used in exit context and only in exit context with HOTPLUG_CPU=n > - be used outside exit context with HOTPLUG_CPU=y So, this also means __cpu_disable(), __cpu_die() and twd_timer_stop() are also wrong. However, removing __cpuexit from cpu_die() creates: WARNING: vmlinux.o(.text+0x6834): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel() The function cpu_die() references the function __cpuinit secondary_start_kernel(). This is often because cpu_die lacks a __cpuinit annotation or the annotation of secondary_start_kernel is wrong. so fix this using __ref. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Sam Ravnborg <sam@ravnborg.org>
690 lines
14 KiB
C
690 lines
14 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/err.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 <linux/percpu.h>
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#include <linux/clockchips.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/cputype.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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#include <asm/localtimer.h>
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#include <asm/smp_plat.h>
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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_CALL_FUNC_SINGLE,
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IPI_CPU_STOP,
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};
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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 + pgd_index(PHYS_OFFSET), 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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flush_pmd_entry(pmd);
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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 = __pmd(0);
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clean_pmd_entry(pmd);
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pgd_free(&init_mm, 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 __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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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();
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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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}
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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 __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 __ref 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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cpumask_set_cpu(cpu, mm_cpumask(mm));
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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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notify_cpu_starting(cpu);
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local_irq_enable();
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local_fiq_enable();
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/*
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* Setup the percpu timer for this CPU.
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*/
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percpu_timer_setup();
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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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set_cpu_online(cpu, true);
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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(const struct cpumask *mask, 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(cpu, mask) {
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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(mask);
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local_irq_restore(flags);
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}
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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send_ipi_message(mask, IPI_CALL_FUNC);
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}
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void arch_send_call_function_single_ipi(int cpu)
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{
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send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
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}
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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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/*
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* Timer (local or broadcast) support
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*/
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static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
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static void ipi_timer(void)
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{
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struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);
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irq_enter();
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evt->event_handler(evt);
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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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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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static void smp_timer_broadcast(const struct cpumask *mask)
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{
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send_ipi_message(mask, IPI_TIMER);
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}
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static void broadcast_timer_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evt)
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{
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}
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static void local_timer_setup(struct clock_event_device *evt)
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{
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evt->name = "dummy_timer";
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evt->features = CLOCK_EVT_FEAT_ONESHOT |
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CLOCK_EVT_FEAT_PERIODIC |
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CLOCK_EVT_FEAT_DUMMY;
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evt->rating = 400;
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evt->mult = 1;
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evt->set_mode = broadcast_timer_set_mode;
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evt->broadcast = smp_timer_broadcast;
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clockevents_register_device(evt);
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}
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#endif
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void __cpuinit percpu_timer_setup(void)
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{
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unsigned int cpu = smp_processor_id();
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struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
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evt->cpumask = cpumask_of(cpu);
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local_timer_setup(evt);
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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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set_cpu_online(cpu, false);
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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 {
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unsigned nextmsg;
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nextmsg = msgs & -msgs;
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msgs &= ~nextmsg;
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nextmsg = ffz(~nextmsg);
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switch (nextmsg) {
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case IPI_TIMER:
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ipi_timer();
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break;
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case IPI_RESCHEDULE:
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/*
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* nothing more to do - eveything is
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* done on the interrupt return path
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*/
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break;
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case IPI_CALL_FUNC:
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generic_smp_call_function_interrupt();
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break;
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case IPI_CALL_FUNC_SINGLE:
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generic_smp_call_function_single_interrupt();
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break;
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case IPI_CPU_STOP:
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ipi_cpu_stop(cpu);
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break;
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default:
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printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
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cpu, nextmsg);
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break;
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}
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} while (msgs);
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}
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set_irq_regs(old_regs);
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|
}
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
{
|
|
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
|
|
}
|
|
|
|
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 setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void
|
|
on_each_cpu_mask(void (*func)(void *), void *info, int wait,
|
|
const struct cpumask *mask)
|
|
{
|
|
preempt_disable();
|
|
|
|
smp_call_function_many(mask, func, info, wait);
|
|
if (cpumask_test_cpu(smp_processor_id(), mask))
|
|
func(info);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
if (tlb_ops_need_broadcast())
|
|
on_each_cpu(ipi_flush_tlb_all, NULL, 1);
|
|
else
|
|
local_flush_tlb_all();
|
|
}
|
|
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
if (tlb_ops_need_broadcast())
|
|
on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mm_cpumask(mm));
|
|
else
|
|
local_flush_tlb_mm(mm);
|
|
}
|
|
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_vma = vma;
|
|
ta.ta_start = uaddr;
|
|
on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mm_cpumask(vma->vm_mm));
|
|
} else
|
|
local_flush_tlb_page(vma, uaddr);
|
|
}
|
|
|
|
void flush_tlb_kernel_page(unsigned long kaddr)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_start = kaddr;
|
|
on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1);
|
|
} else
|
|
local_flush_tlb_kernel_page(kaddr);
|
|
}
|
|
|
|
void flush_tlb_range(struct vm_area_struct *vma,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
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, mm_cpumask(vma->vm_mm));
|
|
} else
|
|
local_flush_tlb_range(vma, start, end);
|
|
}
|
|
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
{
|
|
if (tlb_ops_need_broadcast()) {
|
|
struct tlb_args ta;
|
|
ta.ta_start = start;
|
|
ta.ta_end = end;
|
|
on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1);
|
|
} else
|
|
local_flush_tlb_kernel_range(start, end);
|
|
}
|