2005-04-17 00:20:36 +02:00
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/*
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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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2006-10-25 14:59:16 +02:00
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#include <linux/module.h>
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2005-04-17 00:20:36 +02:00
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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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2007-07-30 00:36:13 +02:00
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#include <linux/err.h>
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2005-04-17 00:20:36 +02:00
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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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2006-10-25 14:59:16 +02:00
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#include <linux/irq.h>
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2009-05-17 19:58:34 +02:00
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#include <linux/percpu.h>
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#include <linux/clockchips.h>
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2010-11-30 12:07:35 +01:00
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#include <linux/completion.h>
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2005-04-17 00:20:36 +02:00
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2011-07-27 01:09:06 +02:00
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#include <linux/atomic.h>
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2005-04-17 00:20:36 +02:00
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#include <asm/cacheflush.h>
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#include <asm/cpu.h>
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2009-06-11 16:35:00 +02:00
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#include <asm/cputype.h>
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2011-10-08 12:20:42 +02:00
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#include <asm/exception.h>
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2011-09-30 12:43:29 +02:00
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#include <asm/idmap.h>
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2011-08-08 14:21:59 +02:00
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#include <asm/topology.h>
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2005-06-18 10:33:31 +02:00
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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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2005-04-17 00:20:36 +02:00
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#include <asm/processor.h>
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2010-10-01 16:38:24 +02:00
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#include <asm/sections.h>
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2005-04-17 00:20:36 +02:00
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#include <asm/tlbflush.h>
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#include <asm/ptrace.h>
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2009-05-17 19:58:34 +02:00
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#include <asm/localtimer.h>
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2011-08-23 23:19:29 +02:00
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#include <asm/smp_plat.h>
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2005-04-17 00:20:36 +02:00
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2005-06-18 10:33:31 +02:00
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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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2005-04-17 00:20:36 +02:00
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enum ipi_msg_type {
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2010-11-15 10:54:18 +01:00
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IPI_TIMER = 2,
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2005-04-17 00:20:36 +02:00
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IPI_RESCHEDULE,
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IPI_CALL_FUNC,
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2008-06-10 20:48:30 +02:00
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IPI_CALL_FUNC_SINGLE,
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2005-04-17 00:20:36 +02:00
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IPI_CPU_STOP,
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};
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2012-01-18 16:59:45 +01:00
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static DECLARE_COMPLETION(cpu_running);
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2012-04-20 15:05:50 +02:00
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int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle)
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2005-04-17 00:20:36 +02:00
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{
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int ret;
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2005-06-18 10:33:31 +02:00
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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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2006-01-12 10:05:58 +01:00
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secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
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2011-11-23 13:26:25 +01:00
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secondary_data.pgdir = virt_to_phys(idmap_pgd);
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2011-05-26 12:22:44 +02:00
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secondary_data.swapper_pg_dir = virt_to_phys(swapper_pg_dir);
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2010-02-12 15:36:24 +01:00
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__cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data));
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outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1));
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2005-06-18 10:33:31 +02:00
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2005-04-17 00:20:36 +02:00
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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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2005-06-18 10:33:31 +02:00
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if (ret == 0) {
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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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2012-01-18 16:59:45 +01:00
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wait_for_completion_timeout(&cpu_running,
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msecs_to_jiffies(1000));
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2005-06-18 10:33:31 +02:00
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2010-12-18 13:34:39 +01:00
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if (!cpu_online(cpu)) {
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pr_crit("CPU%u: failed to come online\n", cpu);
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2005-06-18 10:33:31 +02:00
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ret = -EIO;
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2010-12-18 13:34:39 +01:00
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}
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} else {
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pr_err("CPU%u: failed to boot: %d\n", cpu, ret);
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2005-06-18 10:33:31 +02:00
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}
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2005-11-08 11:44:46 +01:00
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secondary_data.stack = NULL;
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2005-06-18 10:33:31 +02:00
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secondary_data.pgdir = 0;
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2005-04-17 00:20:36 +02:00
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return ret;
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}
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2005-11-02 23:24:33 +01:00
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#ifdef CONFIG_HOTPLUG_CPU
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2010-12-20 15:28:02 +01:00
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static void percpu_timer_stop(void);
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2005-11-02 23:24:33 +01:00
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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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2009-09-27 22:04:48 +02:00
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int __cpu_disable(void)
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2005-11-02 23:24:33 +01:00
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{
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unsigned int cpu = smp_processor_id();
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int ret;
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2010-05-15 11:18:05 +02:00
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ret = platform_cpu_disable(cpu);
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2005-11-02 23:24:33 +01:00
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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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2009-05-28 15:16:52 +02:00
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set_cpu_online(cpu, false);
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2005-11-02 23:24:33 +01:00
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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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2005-11-08 20:08:05 +01:00
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/*
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* Stop the local timer for this CPU.
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*/
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2010-12-20 15:28:02 +01:00
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percpu_timer_stop();
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2005-11-08 20:08:05 +01:00
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2005-11-02 23:24:33 +01:00
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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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2012-06-01 01:26:22 +02:00
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clear_tasks_mm_cpumask(cpu);
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2005-11-02 23:24:33 +01:00
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return 0;
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}
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2010-11-30 12:07:35 +01:00
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static DECLARE_COMPLETION(cpu_died);
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2005-11-02 23:24:33 +01:00
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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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2009-09-27 22:04:48 +02:00
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void __cpu_die(unsigned int cpu)
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2005-11-02 23:24:33 +01:00
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{
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2010-11-30 12:07:35 +01:00
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if (!wait_for_completion_timeout(&cpu_died, msecs_to_jiffies(5000))) {
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pr_err("CPU%u: cpu didn't die\n", cpu);
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return;
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}
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printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
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2005-11-02 23:24:33 +01:00
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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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2009-09-27 22:04:48 +02:00
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void __ref cpu_die(void)
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2005-11-02 23:24:33 +01:00
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{
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unsigned int cpu = smp_processor_id();
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idle_task_exit();
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2010-11-30 13:21:30 +01:00
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local_irq_disable();
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mb();
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2010-11-30 12:07:35 +01:00
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/* Tell __cpu_die() that this CPU is now safe to dispose of */
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2012-07-06 23:03:42 +02:00
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RCU_NONIDLE(complete(&cpu_died));
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2010-11-30 12:07:35 +01:00
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2005-11-02 23:24:33 +01:00
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/*
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* actual CPU shutdown procedure is at least platform (if not
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2010-11-30 12:07:35 +01:00
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* CPU) specific.
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2005-11-02 23:24:33 +01:00
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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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2010-12-20 17:58:19 +01:00
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" mov fp, #0\n"
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2005-11-02 23:24:33 +01:00
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" b secondary_start_kernel"
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:
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2006-01-12 10:05:58 +01:00
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: "r" (task_stack_page(current) + THREAD_SIZE - 8));
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2005-11-02 23:24:33 +01:00
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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2010-12-03 12:09:48 +01:00
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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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static 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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2011-08-08 14:21:59 +02:00
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store_cpu_topology(cpuid);
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2010-12-03 12:09:48 +01:00
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}
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2012-01-11 00:38:25 +01:00
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static void percpu_timer_setup(void);
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2005-06-18 10:33:31 +02:00
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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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2005-07-17 22:35:41 +02:00
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asmlinkage void __cpuinit secondary_start_kernel(void)
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2005-06-18 10:33:31 +02:00
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{
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struct mm_struct *mm = &init_mm;
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2005-11-12 18:21:47 +01:00
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unsigned int cpu = smp_processor_id();
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2005-06-18 10:33:31 +02:00
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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_count);
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current->active_mm = mm;
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2009-09-24 17:34:49 +02:00
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cpumask_set_cpu(cpu, mm_cpumask(mm));
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2005-06-18 10:33:31 +02:00
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cpu_switch_mm(mm->pgd, mm);
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enter_lazy_tlb(mm, current);
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2005-07-28 21:32:47 +02:00
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local_flush_tlb_all();
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2005-06-18 10:33:31 +02:00
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2012-05-05 21:58:13 +02:00
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printk("CPU%u: Booted secondary processor\n", cpu);
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2005-06-18 10:33:31 +02:00
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cpu_init();
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2005-11-09 06:39:01 +01:00
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preempt_disable();
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2010-12-03 16:00:49 +01:00
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trace_hardirqs_off();
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2005-06-18 10:33:31 +02:00
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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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2008-09-07 16:57:22 +02:00
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notify_cpu_starting(cpu);
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2008-02-04 17:30:57 +01:00
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2005-06-18 10:33:31 +02:00
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calibrate_delay();
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smp_store_cpu_info(cpu);
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/*
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2011-06-20 17:46:01 +02:00
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* OK, now it's safe to let the boot CPU continue. Wait for
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* the CPU migration code to notice that the CPU is online
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2012-01-18 16:59:45 +01:00
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* before we continue - which happens after __cpu_up returns.
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2005-06-18 10:33:31 +02:00
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*/
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2009-05-28 15:16:52 +02:00
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set_cpu_online(cpu, true);
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2012-01-18 16:59:45 +01:00
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complete(&cpu_running);
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2011-10-14 13:44:41 +02:00
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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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local_irq_enable();
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local_fiq_enable();
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2005-06-18 10:33:31 +02:00
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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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2005-04-17 00:20:36 +02:00
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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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}
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2010-12-03 12:09:48 +01:00
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void __init smp_prepare_cpus(unsigned int max_cpus)
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2005-04-17 00:20:36 +02:00
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{
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2010-12-03 12:09:48 +01:00
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unsigned int ncores = num_possible_cpus();
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2005-04-17 00:20:36 +02:00
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2011-08-08 14:21:59 +02:00
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init_cpu_topology();
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2010-12-03 12:09:48 +01:00
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smp_store_cpu_info(smp_processor_id());
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2005-04-17 00:20:36 +02:00
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/*
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2010-12-03 12:09:48 +01:00
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* are we trying to boot more cores than exist?
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
2010-12-03 12:09:48 +01:00
|
|
|
if (max_cpus > ncores)
|
|
|
|
max_cpus = ncores;
|
2011-07-07 02:56:51 +02:00
|
|
|
if (ncores > 1 && max_cpus) {
|
2010-12-03 12:09:48 +01:00
|
|
|
/*
|
|
|
|
* Enable the local timer or broadcast device for the
|
|
|
|
* boot CPU, but only if we have more than one CPU.
|
|
|
|
*/
|
|
|
|
percpu_timer_setup();
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2011-07-07 02:56:51 +02:00
|
|
|
/*
|
|
|
|
* Initialise the present map, which describes the set of CPUs
|
|
|
|
* actually populated at the present time. A platform should
|
|
|
|
* re-initialize the map in platform_smp_prepare_cpus() if
|
|
|
|
* present != possible (e.g. physical hotplug).
|
|
|
|
*/
|
2012-03-29 07:08:30 +02:00
|
|
|
init_cpu_present(cpu_possible_mask);
|
2011-07-07 02:56:51 +02:00
|
|
|
|
2010-12-03 12:09:48 +01:00
|
|
|
/*
|
|
|
|
* Initialise the SCU if there are more than one CPU
|
|
|
|
* and let them know where to start.
|
|
|
|
*/
|
|
|
|
platform_smp_prepare_cpus(max_cpus);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2011-04-03 14:01:30 +02:00
|
|
|
static void (*smp_cross_call)(const struct cpumask *, unsigned int);
|
|
|
|
|
|
|
|
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
|
|
|
|
{
|
|
|
|
smp_cross_call = fn;
|
|
|
|
}
|
|
|
|
|
2009-05-17 17:20:18 +02:00
|
|
|
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2010-12-20 15:47:19 +01:00
|
|
|
smp_cross_call(mask, IPI_CALL_FUNC);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2008-06-10 20:48:30 +02:00
|
|
|
void arch_send_call_function_single_ipi(int cpu)
|
2008-02-04 17:28:56 +01:00
|
|
|
{
|
2010-12-20 15:47:19 +01:00
|
|
|
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
|
2008-02-04 17:28:56 +01:00
|
|
|
}
|
|
|
|
|
2010-11-15 15:40:29 +01:00
|
|
|
static const char *ipi_types[NR_IPI] = {
|
|
|
|
#define S(x,s) [x - IPI_TIMER] = s
|
|
|
|
S(IPI_TIMER, "Timer broadcast interrupts"),
|
|
|
|
S(IPI_RESCHEDULE, "Rescheduling interrupts"),
|
|
|
|
S(IPI_CALL_FUNC, "Function call interrupts"),
|
|
|
|
S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
|
|
|
|
S(IPI_CPU_STOP, "CPU stop interrupts"),
|
|
|
|
};
|
|
|
|
|
2010-11-15 15:33:51 +01:00
|
|
|
void show_ipi_list(struct seq_file *p, int prec)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2010-11-15 15:40:29 +01:00
|
|
|
unsigned int cpu, i;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 15:40:29 +01:00
|
|
|
for (i = 0; i < NR_IPI; i++) {
|
|
|
|
seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 15:40:29 +01:00
|
|
|
for_each_present_cpu(cpu)
|
|
|
|
seq_printf(p, "%10u ",
|
|
|
|
__get_irq_stat(cpu, ipi_irqs[i]));
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 15:40:29 +01:00
|
|
|
seq_printf(p, " %s\n", ipi_types[i]);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2010-11-15 15:46:46 +01:00
|
|
|
u64 smp_irq_stat_cpu(unsigned int cpu)
|
2005-11-08 20:08:05 +01:00
|
|
|
{
|
2010-11-15 15:46:46 +01:00
|
|
|
u64 sum = 0;
|
|
|
|
int i;
|
2005-11-08 20:08:05 +01:00
|
|
|
|
2010-11-15 15:46:46 +01:00
|
|
|
for (i = 0; i < NR_IPI; i++)
|
|
|
|
sum += __get_irq_stat(cpu, ipi_irqs[i]);
|
2005-11-08 20:08:05 +01:00
|
|
|
|
2010-11-15 15:46:46 +01:00
|
|
|
return sum;
|
2005-11-08 20:08:05 +01:00
|
|
|
}
|
|
|
|
|
2009-05-17 19:58:34 +02:00
|
|
|
/*
|
|
|
|
* Timer (local or broadcast) support
|
|
|
|
*/
|
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
|
|
|
|
|
2006-10-25 14:59:16 +02:00
|
|
|
static void ipi_timer(void)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
2009-05-17 19:58:34 +02:00
|
|
|
struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);
|
|
|
|
evt->event_handler(evt);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2009-05-17 19:58:34 +02:00
|
|
|
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
|
|
|
|
static void smp_timer_broadcast(const struct cpumask *mask)
|
|
|
|
{
|
2010-12-20 15:47:19 +01:00
|
|
|
smp_cross_call(mask, IPI_TIMER);
|
2009-05-17 19:58:34 +02:00
|
|
|
}
|
2010-07-26 14:19:43 +02:00
|
|
|
#else
|
|
|
|
#define smp_timer_broadcast NULL
|
|
|
|
#endif
|
2009-05-17 19:58:34 +02:00
|
|
|
|
|
|
|
static void broadcast_timer_set_mode(enum clock_event_mode mode,
|
|
|
|
struct clock_event_device *evt)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
2011-04-27 02:34:27 +02:00
|
|
|
static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt)
|
2009-05-17 19:58:34 +02:00
|
|
|
{
|
|
|
|
evt->name = "dummy_timer";
|
|
|
|
evt->features = CLOCK_EVT_FEAT_ONESHOT |
|
|
|
|
CLOCK_EVT_FEAT_PERIODIC |
|
|
|
|
CLOCK_EVT_FEAT_DUMMY;
|
|
|
|
evt->rating = 400;
|
|
|
|
evt->mult = 1;
|
|
|
|
evt->set_mode = broadcast_timer_set_mode;
|
|
|
|
|
|
|
|
clockevents_register_device(evt);
|
|
|
|
}
|
|
|
|
|
2012-01-10 20:26:45 +01:00
|
|
|
static struct local_timer_ops *lt_ops;
|
|
|
|
|
|
|
|
#ifdef CONFIG_LOCAL_TIMERS
|
|
|
|
int local_timer_register(struct local_timer_ops *ops)
|
|
|
|
{
|
2012-02-14 12:25:58 +01:00
|
|
|
if (!is_smp() || !setup_max_cpus)
|
|
|
|
return -ENXIO;
|
|
|
|
|
2012-01-10 20:26:45 +01:00
|
|
|
if (lt_ops)
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
lt_ops = ops;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2012-01-11 00:38:25 +01:00
|
|
|
static void __cpuinit percpu_timer_setup(void)
|
2009-05-17 19:58:34 +02:00
|
|
|
{
|
|
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
|
|
|
|
|
|
|
|
evt->cpumask = cpumask_of(cpu);
|
2010-07-26 14:19:43 +02:00
|
|
|
evt->broadcast = smp_timer_broadcast;
|
2009-05-17 19:58:34 +02:00
|
|
|
|
2012-01-11 00:38:25 +01:00
|
|
|
if (!lt_ops || lt_ops->setup(evt))
|
2011-02-23 18:53:15 +01:00
|
|
|
broadcast_timer_setup(evt);
|
2009-05-17 19:58:34 +02:00
|
|
|
}
|
|
|
|
|
2010-12-20 15:28:02 +01:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
/*
|
|
|
|
* The generic clock events code purposely does not stop the local timer
|
|
|
|
* on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it
|
|
|
|
* manually here.
|
|
|
|
*/
|
|
|
|
static void percpu_timer_stop(void)
|
|
|
|
{
|
|
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
|
|
|
|
|
2012-01-11 00:38:25 +01:00
|
|
|
if (lt_ops)
|
|
|
|
lt_ops->stop(evt);
|
2010-12-20 15:28:02 +01:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-07-03 15:44:46 +02:00
|
|
|
static DEFINE_RAW_SPINLOCK(stop_lock);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* ipi_cpu_stop - handle IPI from smp_send_stop()
|
|
|
|
*/
|
|
|
|
static void ipi_cpu_stop(unsigned int cpu)
|
|
|
|
{
|
2010-07-26 14:31:27 +02:00
|
|
|
if (system_state == SYSTEM_BOOTING ||
|
|
|
|
system_state == SYSTEM_RUNNING) {
|
2009-07-03 15:44:46 +02:00
|
|
|
raw_spin_lock(&stop_lock);
|
2010-07-26 14:31:27 +02:00
|
|
|
printk(KERN_CRIT "CPU%u: stopping\n", cpu);
|
|
|
|
dump_stack();
|
2009-07-03 15:44:46 +02:00
|
|
|
raw_spin_unlock(&stop_lock);
|
2010-07-26 14:31:27 +02:00
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-05-28 15:16:52 +02:00
|
|
|
set_cpu_online(cpu, false);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
local_fiq_disable();
|
|
|
|
local_irq_disable();
|
|
|
|
|
|
|
|
while (1)
|
|
|
|
cpu_relax();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Main handler for inter-processor interrupts
|
|
|
|
*/
|
2011-01-06 23:32:52 +01:00
|
|
|
asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
|
2011-10-06 16:18:14 +02:00
|
|
|
{
|
|
|
|
handle_IPI(ipinr, regs);
|
|
|
|
}
|
|
|
|
|
|
|
|
void handle_IPI(int ipinr, struct pt_regs *regs)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
unsigned int cpu = smp_processor_id();
|
2006-10-25 14:59:16 +02:00
|
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 15:40:29 +01:00
|
|
|
if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI)
|
|
|
|
__inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
switch (ipinr) {
|
|
|
|
case IPI_TIMER:
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_enter();
|
2010-11-15 10:54:18 +01:00
|
|
|
ipi_timer();
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_exit();
|
2010-11-15 10:54:18 +01:00
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
case IPI_RESCHEDULE:
|
2011-04-05 17:23:39 +02:00
|
|
|
scheduler_ipi();
|
2010-11-15 10:54:18 +01:00
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
case IPI_CALL_FUNC:
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_enter();
|
2010-11-15 10:54:18 +01:00
|
|
|
generic_smp_call_function_interrupt();
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_exit();
|
2010-11-15 10:54:18 +01:00
|
|
|
break;
|
2008-06-10 20:48:30 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
case IPI_CALL_FUNC_SINGLE:
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_enter();
|
2010-11-15 10:54:18 +01:00
|
|
|
generic_smp_call_function_single_interrupt();
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_exit();
|
2010-11-15 10:54:18 +01:00
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
case IPI_CPU_STOP:
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_enter();
|
2010-11-15 10:54:18 +01:00
|
|
|
ipi_cpu_stop(cpu);
|
2012-01-19 16:20:58 +01:00
|
|
|
irq_exit();
|
2010-11-15 10:54:18 +01:00
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2010-11-15 10:54:18 +01:00
|
|
|
default:
|
|
|
|
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
|
|
|
|
cpu, ipinr);
|
|
|
|
break;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2006-10-25 14:59:16 +02:00
|
|
|
set_irq_regs(old_regs);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
|
|
{
|
2010-12-20 15:47:19 +01:00
|
|
|
smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2012-04-27 13:51:43 +02:00
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
static void smp_kill_cpus(cpumask_t *mask)
|
|
|
|
{
|
|
|
|
unsigned int cpu;
|
|
|
|
for_each_cpu(cpu, mask)
|
|
|
|
platform_cpu_kill(cpu);
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static void smp_kill_cpus(cpumask_t *mask) { }
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
void smp_send_stop(void)
|
|
|
|
{
|
2010-12-02 10:53:54 +01:00
|
|
|
unsigned long timeout;
|
2012-04-27 13:51:43 +02:00
|
|
|
struct cpumask mask;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2012-04-27 13:51:43 +02:00
|
|
|
cpumask_copy(&mask, cpu_online_mask);
|
|
|
|
cpumask_clear_cpu(smp_processor_id(), &mask);
|
2012-07-28 16:19:55 +02:00
|
|
|
if (!cpumask_empty(&mask))
|
|
|
|
smp_cross_call(&mask, IPI_CPU_STOP);
|
2005-06-28 14:49:16 +02:00
|
|
|
|
2010-12-02 10:53:54 +01:00
|
|
|
/* Wait up to one second for other CPUs to stop */
|
|
|
|
timeout = USEC_PER_SEC;
|
|
|
|
while (num_online_cpus() > 1 && timeout--)
|
|
|
|
udelay(1);
|
2005-06-28 14:49:16 +02:00
|
|
|
|
2010-12-02 10:53:54 +01:00
|
|
|
if (num_online_cpus() > 1)
|
|
|
|
pr_warning("SMP: failed to stop secondary CPUs\n");
|
2012-04-27 13:51:43 +02:00
|
|
|
|
|
|
|
smp_kill_cpus(&mask);
|
2005-06-28 14:49:16 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2005-04-17 00:20:36 +02:00
|
|
|
* not supported here
|
2005-06-28 14:49:16 +02:00
|
|
|
*/
|
2007-07-23 13:59:46 +02:00
|
|
|
int setup_profiling_timer(unsigned int multiplier)
|
2005-06-28 14:49:16 +02:00
|
|
|
{
|
2005-04-17 00:20:36 +02:00
|
|
|
return -EINVAL;
|
2005-06-28 14:49:16 +02:00
|
|
|
}
|