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/*
* pseries CPU Hotplug infrastructure.
*
* Split out from arch/powerpc/platforms/pseries/setup.c and
* arch/powerpc/kernel/rtas.c
*
* Peter Bergner, IBM March 2001.
* Copyright (C) 2001 IBM.
*
* Copyright (C) 2006 Michael Ellerman, IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/system.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/vdso_datapage.h>
#include <asm/pSeries_reconfig.h>
#include "xics.h"
/* This version can't take the spinlock, because it never returns */
static struct rtas_args rtas_stop_self_args = {
.token = RTAS_UNKNOWN_SERVICE,
.nargs = 0,
.nret = 1,
.rets = &rtas_stop_self_args.args[0],
};
static void rtas_stop_self(void)
{
struct rtas_args *args = &rtas_stop_self_args;
local_irq_disable();
BUG_ON(args->token == RTAS_UNKNOWN_SERVICE);
printk("cpu %u (hwid %u) Ready to die...\n",
smp_processor_id(), hard_smp_processor_id());
enter_rtas(__pa(args));
panic("Alas, I survived.\n");
}
static void pSeries_mach_cpu_die(void)
{
local_irq_disable();
idle_task_exit();
xics_teardown_cpu(0);
rtas_stop_self();
/* Should never get here... */
BUG();
for(;;);
}
static int __init pseries_cpu_hotplug_init(void)
{
rtas_stop_self_args.token = rtas_token("stop-self");
ppc_md.cpu_die = pSeries_mach_cpu_die;
return 0;
}
arch_initcall(pseries_cpu_hotplug_init);
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