[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / smp.c

/*
 * SMP support for ppc.
 *
 * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
 * deal of code from the sparc and intel versions.
 *
 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
 *
 * PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and
 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
 *
 *      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.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/cache.h>
#include <linux/err.h>
#include <linux/sysdev.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/topology.h>

#include <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/smp.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/cputhreads.h>
#include <asm/cputable.h>
#include <asm/system.h>
#include <asm/mpic.h>
#include <asm/vdso_datapage.h>
#ifdef CONFIG_PPC64
#include <asm/paca.h>
#endif

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif


/* Store all idle threads, this can be reused instead of creating
* a new thread. Also avoids complicated thread destroy functionality
* for idle threads.
*/
#ifdef CONFIG_HOTPLUG_CPU
/*
 * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
 * removed after init for !CONFIG_HOTPLUG_CPU.
 */
static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
#define get_idle_for_cpu(x)      (per_cpu(idle_thread_array, x))
#define set_idle_for_cpu(x, p)   (per_cpu(idle_thread_array, x) = (p))
#else
static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
#define get_idle_for_cpu(x)      (idle_thread_array[(x)])
#define set_idle_for_cpu(x, p)   (idle_thread_array[(x)] = (p))
#endif

struct thread_info *secondary_ti;

DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);

EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
EXPORT_PER_CPU_SYMBOL(cpu_core_map);

/* SMP operations for this machine */
struct smp_ops_t *smp_ops;

/* Can't be static due to PowerMac hackery */
volatile unsigned int cpu_callin_map[NR_CPUS];

int smt_enabled_at_boot = 1;

static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL;

#ifdef CONFIG_PPC64
int __devinit smp_generic_kick_cpu(int nr)
{
	BUG_ON(nr < 0 || nr >= NR_CPUS);

	/*
	 * The processor is currently spinning, waiting for the
	 * cpu_start field to become non-zero After we set cpu_start,
	 * the processor will continue on to secondary_start
	 */
	paca[nr].cpu_start = 1;
	smp_mb();

	return 0;
}
#endif

static irqreturn_t call_function_action(int irq, void *data)
{
	generic_smp_call_function_interrupt();
	return IRQ_HANDLED;
}

static irqreturn_t reschedule_action(int irq, void *data)
{
	/* we just need the return path side effect of checking need_resched */
	return IRQ_HANDLED;
}

static irqreturn_t call_function_single_action(int irq, void *data)
{
	generic_smp_call_function_single_interrupt();
	return IRQ_HANDLED;
}

irqreturn_t debug_ipi_action(int irq, void *data)
{
	if (crash_ipi_function_ptr) {
		crash_ipi_function_ptr(get_irq_regs());
		return IRQ_HANDLED;
	}

#ifdef CONFIG_DEBUGGER
	debugger_ipi(get_irq_regs());
#endif /* CONFIG_DEBUGGER */

	return IRQ_HANDLED;
}

static irq_handler_t smp_ipi_action[] = {
	[PPC_MSG_CALL_FUNCTION] =  call_function_action,
	[PPC_MSG_RESCHEDULE] = reschedule_action,
	[PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action,
	[PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action,
};

const char *smp_ipi_name[] = {
	[PPC_MSG_CALL_FUNCTION] =  "ipi call function",
	[PPC_MSG_RESCHEDULE] = "ipi reschedule",
	[PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single",
	[PPC_MSG_DEBUGGER_BREAK] = "ipi debugger",
};

/* optional function to request ipi, for controllers with >= 4 ipis */
int smp_request_message_ipi(int virq, int msg)
{
	int err;

	if (msg < 0 || msg > PPC_MSG_DEBUGGER_BREAK) {
		return -EINVAL;
	}
#if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC)
	if (msg == PPC_MSG_DEBUGGER_BREAK) {
		return 1;
	}
#endif
	err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED|IRQF_PERCPU,
			  smp_ipi_name[msg], 0);
	WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
		virq, smp_ipi_name[msg], err);

	return err;
}

struct cpu_messages {
	unsigned long messages;		/* current messages bits */
	unsigned long data;		/* data for cause ipi */
};
static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message);

void smp_muxed_ipi_set_data(int cpu, unsigned long data)
{
	struct cpu_messages *info = &per_cpu(ipi_message, cpu);

	info->data = data;
}

void smp_muxed_ipi_message_pass(int cpu, int msg)
{
	struct cpu_messages *info = &per_cpu(ipi_message, cpu);
	unsigned long *tgt = &info->messages;

	set_bit(msg, tgt);
	mb();
	smp_ops->cause_ipi(cpu, info->data);
}

void smp_muxed_ipi_resend(void)
{
	struct cpu_messages *info = &__get_cpu_var(ipi_message);
	unsigned long *tgt = &info->messages;

	if (*tgt)
		smp_ops->cause_ipi(smp_processor_id(), info->data);
}

irqreturn_t smp_ipi_demux(void)
{
	struct cpu_messages *info = &__get_cpu_var(ipi_message);
	unsigned long *tgt = &info->messages;

	mb();	/* order any irq clear */
	while (*tgt) {
		if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, tgt))
			generic_smp_call_function_interrupt();
		if (test_and_clear_bit(PPC_MSG_RESCHEDULE, tgt))
			reschedule_action(0, NULL); /* upcoming sched hook */
		if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE, tgt))
			generic_smp_call_function_single_interrupt();
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
		if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, tgt))
			debug_ipi_action(0, NULL);
#endif
	}
	return IRQ_HANDLED;
}

void smp_send_reschedule(int cpu)
{
	if (likely(smp_ops))
		smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
}

void arch_send_call_function_single_ipi(int cpu)
{
	smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE);
}

void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
	unsigned int cpu;

	for_each_cpu(cpu, mask)
		smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION);
}

#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
void smp_send_debugger_break(void)
{
	int cpu;
	int me = raw_smp_processor_id();

	if (unlikely(!smp_ops))
		return;

	for_each_online_cpu(cpu)
		if (cpu != me)
			smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
}
#endif

#ifdef CONFIG_KEXEC
void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
{
	crash_ipi_function_ptr = crash_ipi_callback;
	if (crash_ipi_callback) {
		mb();
		smp_send_debugger_break();
	}
}
#endif

static void stop_this_cpu(void *dummy)
{
	/* Remove this CPU */
	set_cpu_online(smp_processor_id(), false);

	local_irq_disable();
	while (1)
		;
}

void smp_send_stop(void)
{
	smp_call_function(stop_this_cpu, NULL, 0);
}

struct thread_info *current_set[NR_CPUS];

static void __devinit smp_store_cpu_info(int id)
{
	per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
}

void __init smp_prepare_cpus(unsigned int max_cpus)
{
	unsigned int cpu;

	DBG("smp_prepare_cpus\n");

	/* 
	 * setup_cpu may need to be called on the boot cpu. We havent
	 * spun any cpus up but lets be paranoid.
	 */
	BUG_ON(boot_cpuid != smp_processor_id());

	/* Fixup boot cpu */
	smp_store_cpu_info(boot_cpuid);
	cpu_callin_map[boot_cpuid] = 1;

	for_each_possible_cpu(cpu) {
		zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu),
					GFP_KERNEL, cpu_to_node(cpu));
		zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu),
					GFP_KERNEL, cpu_to_node(cpu));
	}

	cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
	cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));

	if (smp_ops)
		if (smp_ops->probe)
			max_cpus = smp_ops->probe();
		else
			max_cpus = NR_CPUS;
	else
		max_cpus = 1;
}

void __devinit smp_prepare_boot_cpu(void)
{
	BUG_ON(smp_processor_id() != boot_cpuid);
#ifdef CONFIG_PPC64
	paca[boot_cpuid].__current = current;
#endif
	current_set[boot_cpuid] = task_thread_info(current);
}

#ifdef CONFIG_HOTPLUG_CPU
/* State of each CPU during hotplug phases */
static DEFINE_PER_CPU(int, cpu_state) = { 0 };

int generic_cpu_disable(void)
{
	unsigned int cpu = smp_processor_id();

	if (cpu == boot_cpuid)
		return -EBUSY;

	set_cpu_online(cpu, false);
#ifdef CONFIG_PPC64
	vdso_data->processorCount--;
#endif
	migrate_irqs();
	return 0;
}

void generic_cpu_die(unsigned int cpu)
{
	int i;

	for (i = 0; i < 100; i++) {
		smp_rmb();
		if (per_cpu(cpu_state, cpu) == CPU_DEAD)
			return;
		msleep(100);
	}
	printk(KERN_ERR "CPU%d didn't die...\n", cpu);
}

void generic_mach_cpu_die(void)
{
	unsigned int cpu;

	local_irq_disable();
	idle_task_exit();
	cpu = smp_processor_id();
	printk(KERN_DEBUG "CPU%d offline\n", cpu);
	__get_cpu_var(cpu_state) = CPU_DEAD;
	smp_wmb();
	while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
		cpu_relax();
}

void generic_set_cpu_dead(unsigned int cpu)
{
	per_cpu(cpu_state, cpu) = CPU_DEAD;
}
#endif

struct create_idle {
	struct work_struct work;
	struct task_struct *idle;
	struct completion done;
	int cpu;
};

static void __cpuinit do_fork_idle(struct work_struct *work)
{
	struct create_idle *c_idle =
		container_of(work, struct create_idle, work);

	c_idle->idle = fork_idle(c_idle->cpu);
	complete(&c_idle->done);
}

static int __cpuinit create_idle(unsigned int cpu)
{
	struct thread_info *ti;
	struct create_idle c_idle = {
		.cpu	= cpu,
		.done	= COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
	};
	INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);

	c_idle.idle = get_idle_for_cpu(cpu);

	/* We can't use kernel_thread since we must avoid to
	 * reschedule the child. We use a workqueue because
	 * we want to fork from a kernel thread, not whatever
	 * userspace process happens to be trying to online us.
	 */
	if (!c_idle.idle) {
		schedule_work(&c_idle.work);
		wait_for_completion(&c_idle.done);
	} else
		init_idle(c_idle.idle, cpu);
	if (IS_ERR(c_idle.idle)) {		
		pr_err("Failed fork for CPU %u: %li", cpu, PTR_ERR(c_idle.idle));
		return PTR_ERR(c_idle.idle);
	}
	ti = task_thread_info(c_idle.idle);

#ifdef CONFIG_PPC64
	paca[cpu].__current = c_idle.idle;
	paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
#endif
	ti->cpu = cpu;
	current_set[cpu] = ti;

	return 0;
}

int __cpuinit __cpu_up(unsigned int cpu)
{
	int rc, c;

	secondary_ti = current_set[cpu];

	if (smp_ops == NULL ||
	    (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
		return -EINVAL;

	/* Make sure we have an idle thread */
	rc = create_idle(cpu);
	if (rc)
		return rc;

	/* Make sure callin-map entry is 0 (can be leftover a CPU
	 * hotplug
	 */
	cpu_callin_map[cpu] = 0;

	/* The information for processor bringup must
	 * be written out to main store before we release
	 * the processor.
	 */
	smp_mb();

	/* wake up cpus */
	DBG("smp: kicking cpu %d\n", cpu);
	rc = smp_ops->kick_cpu(cpu);
	if (rc) {
		pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
		return rc;
	}

	/*
	 * wait to see if the cpu made a callin (is actually up).
	 * use this value that I found through experimentation.
	 * -- Cort
	 */
	if (system_state < SYSTEM_RUNNING)
		for (c = 50000; c && !cpu_callin_map[cpu]; c--)
			udelay(100);
#ifdef CONFIG_HOTPLUG_CPU
	else
		/*
		 * CPUs can take much longer to come up in the
		 * hotplug case.  Wait five seconds.
		 */
		for (c = 5000; c && !cpu_callin_map[cpu]; c--)
			msleep(1);
#endif

	if (!cpu_callin_map[cpu]) {
		printk(KERN_ERR "Processor %u is stuck.\n", cpu);
		return -ENOENT;
	}

	DBG("Processor %u found.\n", cpu);

	if (smp_ops->give_timebase)
		smp_ops->give_timebase();

	/* Wait until cpu puts itself in the online map */
	while (!cpu_online(cpu))
		cpu_relax();

	return 0;
}

/* Return the value of the reg property corresponding to the given
 * logical cpu.
 */
int cpu_to_core_id(int cpu)
{
	struct device_node *np;
	const int *reg;
	int id = -1;

	np = of_get_cpu_node(cpu, NULL);
	if (!np)
		goto out;

	reg = of_get_property(np, "reg", NULL);
	if (!reg)
		goto out;

	id = *reg;
out:
	of_node_put(np);
	return id;
}

/* Helper routines for cpu to core mapping */
int cpu_core_index_of_thread(int cpu)
{
	return cpu >> threads_shift;
}
EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);

int cpu_first_thread_of_core(int core)
{
	return core << threads_shift;
}
EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);

/* Must be called when no change can occur to cpu_present_mask,
 * i.e. during cpu online or offline.
 */
static struct device_node *cpu_to_l2cache(int cpu)
{
	struct device_node *np;
	struct device_node *cache;

	if (!cpu_present(cpu))
		return NULL;

	np = of_get_cpu_node(cpu, NULL);
	if (np == NULL)
		return NULL;

	cache = of_find_next_cache_node(np);

	of_node_put(np);

	return cache;
}

/* Activate a secondary processor. */
void __devinit start_secondary(void *unused)
{
	unsigned int cpu = smp_processor_id();
	struct device_node *l2_cache;
	int i, base;

	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;

	smp_store_cpu_info(cpu);
	set_dec(tb_ticks_per_jiffy);
	preempt_disable();
	cpu_callin_map[cpu] = 1;

	if (smp_ops->setup_cpu)
		smp_ops->setup_cpu(cpu);
	if (smp_ops->take_timebase)
		smp_ops->take_timebase();

	secondary_cpu_time_init();

#ifdef CONFIG_PPC64
	if (system_state == SYSTEM_RUNNING)
		vdso_data->processorCount++;
#endif
	ipi_call_lock();
	notify_cpu_starting(cpu);
	set_cpu_online(cpu, true);
	/* Update sibling maps */
	base = cpu_first_thread_sibling(cpu);
	for (i = 0; i < threads_per_core; i++) {
		if (cpu_is_offline(base + i))
			continue;
		cpumask_set_cpu(cpu, cpu_sibling_mask(base + i));
		cpumask_set_cpu(base + i, cpu_sibling_mask(cpu));

		/* cpu_core_map should be a superset of
		 * cpu_sibling_map even if we don't have cache
		 * information, so update the former here, too.
		 */
		cpumask_set_cpu(cpu, cpu_core_mask(base + i));
		cpumask_set_cpu(base + i, cpu_core_mask(cpu));
	}
	l2_cache = cpu_to_l2cache(cpu);
	for_each_online_cpu(i) {
		struct device_node *np = cpu_to_l2cache(i);
		if (!np)
			continue;
		if (np == l2_cache) {
			cpumask_set_cpu(cpu, cpu_core_mask(i));
			cpumask_set_cpu(i, cpu_core_mask(cpu));
		}
		of_node_put(np);
	}
	of_node_put(l2_cache);
	ipi_call_unlock();

	local_irq_enable();

	cpu_idle();

	BUG();
}

int setup_profiling_timer(unsigned int multiplier)
{
	return 0;
}

void __init smp_cpus_done(unsigned int max_cpus)
{
	cpumask_var_t old_mask;

	/* We want the setup_cpu() here to be called from CPU 0, but our
	 * init thread may have been "borrowed" by another CPU in the meantime
	 * se we pin us down to CPU 0 for a short while
	 */
	alloc_cpumask_var(&old_mask, GFP_NOWAIT);
	cpumask_copy(old_mask, tsk_cpus_allowed(current));
	set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
	
	if (smp_ops && smp_ops->setup_cpu)
		smp_ops->setup_cpu(boot_cpuid);

	set_cpus_allowed_ptr(current, old_mask);

	free_cpumask_var(old_mask);

	if (smp_ops && smp_ops->bringup_done)
		smp_ops->bringup_done();

	dump_numa_cpu_topology();

}

int arch_sd_sibling_asym_packing(void)
{
	if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
		printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
		return SD_ASYM_PACKING;
	}
	return 0;
}

#ifdef CONFIG_HOTPLUG_CPU
int __cpu_disable(void)
{
	struct device_node *l2_cache;
	int cpu = smp_processor_id();
	int base, i;
	int err;

	if (!smp_ops->cpu_disable)
		return -ENOSYS;

	err = smp_ops->cpu_disable();
	if (err)
		return err;

	/* Update sibling maps */
	base = cpu_first_thread_sibling(cpu);
	for (i = 0; i < threads_per_core; i++) {
		cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i));
		cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu));
		cpumask_clear_cpu(cpu, cpu_core_mask(base + i));
		cpumask_clear_cpu(base + i, cpu_core_mask(cpu));
	}

	l2_cache = cpu_to_l2cache(cpu);
	for_each_present_cpu(i) {
		struct device_node *np = cpu_to_l2cache(i);
		if (!np)
			continue;
		if (np == l2_cache) {
			cpumask_clear_cpu(cpu, cpu_core_mask(i));
			cpumask_clear_cpu(i, cpu_core_mask(cpu));
		}
		of_node_put(np);
	}
	of_node_put(l2_cache);


	return 0;
}

void __cpu_die(unsigned int cpu)
{
	if (smp_ops->cpu_die)
		smp_ops->cpu_die(cpu);
}

static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex);

void cpu_hotplug_driver_lock()
{
	mutex_lock(&powerpc_cpu_hotplug_driver_mutex);
}

void cpu_hotplug_driver_unlock()
{
	mutex_unlock(&powerpc_cpu_hotplug_driver_mutex);
}

void cpu_die(void)
{
	if (ppc_md.cpu_die)
		ppc_md.cpu_die();

	/* If we return, we re-enter start_secondary */
	start_secondary_resume();
}

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* SMP support for ppc.
	3	*
	4	* Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
	5	* deal of code from the sparc and intel versions.
	6	*
	7	* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
	8	*
	9	* PowerPC-64 Support added by Dave Engebretsen, Peter Bergner, and
	10	* Mike Corrigan {engebret\|bergner\|mikec}@us.ibm.com
	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License
	14	* as published by the Free Software Foundation; either version
	15	* 2 of the License, or (at your option) any later version.
	16	*/
	17
	18	#undef DEBUG
	19
1da177e4 LT	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/sched.h>
	23	#include <linux/smp.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/delay.h>
	26	#include <linux/init.h>
	27	#include <linux/spinlock.h>
	28	#include <linux/cache.h>
	29	#include <linux/err.h>
	30	#include <linux/sysdev.h>
	31	#include <linux/cpu.h>
	32	#include <linux/notifier.h>
4b703a23	33	#include <linux/topology.h>
1da177e4 LT	34
	35	#include <asm/ptrace.h>
	36	#include <asm/atomic.h>
	37	#include <asm/irq.h>
	38	#include <asm/page.h>
	39	#include <asm/pgtable.h>
	40	#include <asm/prom.h>
	41	#include <asm/smp.h>
1da177e4 LT	42	#include <asm/time.h>
1da177e4 LT	43	#include <asm/machdep.h>
e2075f79	44	#include <asm/cputhreads.h>
1da177e4 LT	45	#include <asm/cputable.h>
1da177e4 LT	46	#include <asm/system.h>
bbeb3f4c	47	#include <asm/mpic.h>
a7f290da	48	#include <asm/vdso_datapage.h>
5ad57078 PM	49	#ifdef CONFIG_PPC64
	50	#include <asm/paca.h>
	51	#endif
	52
1da177e4	53	#ifdef DEBUG
f9e4ec57	54	#include <asm/udbg.h>
1da177e4 LT	55	#define DBG(fmt...) udbg_printf(fmt)
	56	#else
	57	#define DBG(fmt...)
	58	#endif
	59
c56e5853 BH	60
	61	/* Store all idle threads, this can be reused instead of creating
	62	* a new thread. Also avoids complicated thread destroy functionality
	63	* for idle threads.
	64	*/
	65	#ifdef CONFIG_HOTPLUG_CPU
	66	/*
	67	* Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
	68	* removed after init for !CONFIG_HOTPLUG_CPU.
	69	*/
	70	static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
	71	#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
	72	#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
	73	#else
	74	static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
	75	#define get_idle_for_cpu(x) (idle_thread_array[(x)])
	76	#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
	77	#endif
	78
f9e4ec57 ME	79	struct thread_info *secondary_ti;
f9e4ec57 ME	80
cc1ba8ea AB	81	DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
cc1ba8ea AB	82	DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
1da177e4	83
d5a7430d	84	EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
440a0857	85	EXPORT_PER_CPU_SYMBOL(cpu_core_map);
1da177e4	86
5ad57078	87	/* SMP operations for this machine */
1da177e4 LT	88	struct smp_ops_t *smp_ops;
1da177e4 LT	89
7ccbe504 BH	90	/* Can't be static due to PowerMac hackery */
7ccbe504 BH	91	volatile unsigned int cpu_callin_map[NR_CPUS];
1da177e4	92
1da177e4 LT	93	int smt_enabled_at_boot = 1;
1da177e4 LT	94
cc532915 ME	95	static void (crash_ipi_function_ptr)(struct pt_regs ) = NULL;
cc532915 ME	96
5ad57078	97	#ifdef CONFIG_PPC64
de300974	98	int __devinit smp_generic_kick_cpu(int nr)
1da177e4 LT	99	{
	100	BUG_ON(nr < 0 \|\| nr >= NR_CPUS);
	101
	102	/*
	103	* The processor is currently spinning, waiting for the
	104	* cpu_start field to become non-zero After we set cpu_start,
	105	* the processor will continue on to secondary_start
	106	*/
	107	paca[nr].cpu_start = 1;
0d8d4d42	108	smp_mb();
de300974 ME	109
de300974 ME	110	return 0;
1da177e4	111	}
5ad57078	112	#endif
1da177e4	113
25ddd738 MM	114	static irqreturn_t call_function_action(int irq, void *data)
	115	{
	116	generic_smp_call_function_interrupt();
	117	return IRQ_HANDLED;
	118	}
	119
	120	static irqreturn_t reschedule_action(int irq, void *data)
	121	{
	122	/* we just need the return path side effect of checking need_resched */
	123	return IRQ_HANDLED;
	124	}
	125
	126	static irqreturn_t call_function_single_action(int irq, void *data)
	127	{
	128	generic_smp_call_function_single_interrupt();
	129	return IRQ_HANDLED;
	130	}
	131
23d72bfd	132	irqreturn_t debug_ipi_action(int irq, void *data)
25ddd738	133	{
23d72bfd MM	134	if (crash_ipi_function_ptr) {
	135	crash_ipi_function_ptr(get_irq_regs());
	136	return IRQ_HANDLED;
	137	}
	138
	139	#ifdef CONFIG_DEBUGGER
	140	debugger_ipi(get_irq_regs());
	141	#endif /* CONFIG_DEBUGGER */
	142
25ddd738 MM	143	return IRQ_HANDLED;
	144	}
	145
	146	static irq_handler_t smp_ipi_action[] = {
	147	[PPC_MSG_CALL_FUNCTION] = call_function_action,
	148	[PPC_MSG_RESCHEDULE] = reschedule_action,
	149	[PPC_MSG_CALL_FUNC_SINGLE] = call_function_single_action,
	150	[PPC_MSG_DEBUGGER_BREAK] = debug_ipi_action,
	151	};
	152
	153	const char *smp_ipi_name[] = {
	154	[PPC_MSG_CALL_FUNCTION] = "ipi call function",
	155	[PPC_MSG_RESCHEDULE] = "ipi reschedule",
	156	[PPC_MSG_CALL_FUNC_SINGLE] = "ipi call function single",
	157	[PPC_MSG_DEBUGGER_BREAK] = "ipi debugger",
	158	};
	159
	160	/* optional function to request ipi, for controllers with >= 4 ipis */
	161	int smp_request_message_ipi(int virq, int msg)
	162	{
	163	int err;
	164
	165	if (msg < 0 \|\| msg > PPC_MSG_DEBUGGER_BREAK) {
	166	return -EINVAL;
	167	}
	168	#if !defined(CONFIG_DEBUGGER) && !defined(CONFIG_KEXEC)
	169	if (msg == PPC_MSG_DEBUGGER_BREAK) {
	170	return 1;
	171	}
	172	#endif
	173	err = request_irq(virq, smp_ipi_action[msg], IRQF_DISABLED\|IRQF_PERCPU,
	174	smp_ipi_name[msg], 0);
	175	WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
	176	virq, smp_ipi_name[msg], err);
	177
	178	return err;
	179	}
	180
23d72bfd MM	181	struct cpu_messages {
	182	unsigned long messages; /* current messages bits */
	183	unsigned long data; /* data for cause ipi */
	184	};
	185	static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpu_messages, ipi_message);
	186
	187	void smp_muxed_ipi_set_data(int cpu, unsigned long data)
	188	{
	189	struct cpu_messages *info = &per_cpu(ipi_message, cpu);
	190
	191	info->data = data;
	192	}
	193
	194	void smp_muxed_ipi_message_pass(int cpu, int msg)
	195	{
	196	struct cpu_messages *info = &per_cpu(ipi_message, cpu);
	197	unsigned long *tgt = &info->messages;
	198
	199	set_bit(msg, tgt);
	200	mb();
	201	smp_ops->cause_ipi(cpu, info->data);
	202	}
	203
	204	void smp_muxed_ipi_resend(void)
	205	{
	206	struct cpu_messages *info = &__get_cpu_var(ipi_message);
	207	unsigned long *tgt = &info->messages;
	208
	209	if (*tgt)
	210	smp_ops->cause_ipi(smp_processor_id(), info->data);
	211	}
	212
	213	irqreturn_t smp_ipi_demux(void)
	214	{
	215	struct cpu_messages *info = &__get_cpu_var(ipi_message);
	216	unsigned long *tgt = &info->messages;
	217
	218	mb(); /* order any irq clear */
	219	while (*tgt) {
	220	if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, tgt))
	221	generic_smp_call_function_interrupt();
	222	if (test_and_clear_bit(PPC_MSG_RESCHEDULE, tgt))
	223	reschedule_action(0, NULL); /* upcoming sched hook */
	224	if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE, tgt))
	225	generic_smp_call_function_single_interrupt();
	226	#if defined(CONFIG_DEBUGGER) \|\| defined(CONFIG_KEXEC)
	227	if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, tgt))
	228	debug_ipi_action(0, NULL);
	229	#endif
	230	}
	231	return IRQ_HANDLED;
	232	}
	233
1da177e4 LT	234	void smp_send_reschedule(int cpu)
1da177e4 LT	235	{
8cffc6ac BH	236	if (likely(smp_ops))
8cffc6ac BH	237	smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
1da177e4 LT	238	}
1da177e4 LT	239
b7d7a240 JA	240	void arch_send_call_function_single_ipi(int cpu)
	241	{
	242	smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE);
	243	}
	244
f063ea02	245	void arch_send_call_function_ipi_mask(const struct cpumask *mask)
b7d7a240 JA	246	{
	247	unsigned int cpu;
	248
f063ea02	249	for_each_cpu(cpu, mask)
b7d7a240 JA	250	smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION);
	251	}
	252
e0476371 MM	253	#if defined(CONFIG_DEBUGGER) \|\| defined(CONFIG_KEXEC)
e0476371 MM	254	void smp_send_debugger_break(void)
1da177e4	255	{
e0476371 MM	256	int cpu;
	257	int me = raw_smp_processor_id();
	258
	259	if (unlikely(!smp_ops))
	260	return;
	261
	262	for_each_online_cpu(cpu)
	263	if (cpu != me)
	264	smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
1da177e4 LT	265	}
	266	#endif
	267
cc532915 ME	268	#ifdef CONFIG_KEXEC
	269	void crash_send_ipi(void (crash_ipi_callback)(struct pt_regs ))
	270	{
	271	crash_ipi_function_ptr = crash_ipi_callback;
e0476371	272	if (crash_ipi_callback) {
cc532915	273	mb();
e0476371	274	smp_send_debugger_break();
cc532915 ME	275	}
	276	}
	277	#endif
	278
1da177e4 LT	279	static void stop_this_cpu(void *dummy)
1da177e4 LT	280	{
8389b37d VB	281	/* Remove this CPU */
	282	set_cpu_online(smp_processor_id(), false);
	283
1da177e4 LT	284	local_irq_disable();
	285	while (1)
	286	;
	287	}
	288
8fd7675c SS	289	void smp_send_stop(void)
8fd7675c SS	290	{
8691e5a8	291	smp_call_function(stop_this_cpu, NULL, 0);
1da177e4 LT	292	}
1da177e4 LT	293
1da177e4 LT	294	struct thread_info *current_set[NR_CPUS];
1da177e4 LT	295
1da177e4 LT	296	static void __devinit smp_store_cpu_info(int id)
1da177e4 LT	297	{
6b7487fc	298	per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
1da177e4 LT	299	}
1da177e4 LT	300
1da177e4 LT	301	void __init smp_prepare_cpus(unsigned int max_cpus)
	302	{
	303	unsigned int cpu;
	304
	305	DBG("smp_prepare_cpus\n");
	306
	307	/*
	308	* setup_cpu may need to be called on the boot cpu. We havent
	309	* spun any cpus up but lets be paranoid.
	310	*/
	311	BUG_ON(boot_cpuid != smp_processor_id());
	312
	313	/* Fixup boot cpu */
	314	smp_store_cpu_info(boot_cpuid);
	315	cpu_callin_map[boot_cpuid] = 1;
	316
cc1ba8ea AB	317	for_each_possible_cpu(cpu) {
	318	zalloc_cpumask_var_node(&per_cpu(cpu_sibling_map, cpu),
	319	GFP_KERNEL, cpu_to_node(cpu));
	320	zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu),
	321	GFP_KERNEL, cpu_to_node(cpu));
	322	}
	323
	324	cpumask_set_cpu(boot_cpuid, cpu_sibling_mask(boot_cpuid));
	325	cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));
	326
8cffc6ac	327	if (smp_ops)
757cbd46 KG	328	if (smp_ops->probe)
	329	max_cpus = smp_ops->probe();
	330	else
	331	max_cpus = NR_CPUS;
8cffc6ac BH	332	else
8cffc6ac BH	333	max_cpus = 1;
1da177e4 LT	334	}
	335
	336	void __devinit smp_prepare_boot_cpu(void)
	337	{
	338	BUG_ON(smp_processor_id() != boot_cpuid);
5ad57078	339	#ifdef CONFIG_PPC64
1da177e4	340	paca[boot_cpuid].__current = current;
5ad57078	341	#endif
b5e2fc1c	342	current_set[boot_cpuid] = task_thread_info(current);
1da177e4 LT	343	}
	344
	345	#ifdef CONFIG_HOTPLUG_CPU
	346	/* State of each CPU during hotplug phases */
105765f4	347	static DEFINE_PER_CPU(int, cpu_state) = { 0 };
1da177e4 LT	348
	349	int generic_cpu_disable(void)
	350	{
	351	unsigned int cpu = smp_processor_id();
	352
	353	if (cpu == boot_cpuid)
	354	return -EBUSY;
	355
ea0f1cab	356	set_cpu_online(cpu, false);
799d6046	357	#ifdef CONFIG_PPC64
a7f290da	358	vdso_data->processorCount--;
094fe2e7	359	#endif
1c91cc57	360	migrate_irqs();
1da177e4 LT	361	return 0;
	362	}
	363
1da177e4 LT	364	void generic_cpu_die(unsigned int cpu)
	365	{
	366	int i;
	367
	368	for (i = 0; i < 100; i++) {
0d8d4d42	369	smp_rmb();
1da177e4 LT	370	if (per_cpu(cpu_state, cpu) == CPU_DEAD)
	371	return;
	372	msleep(100);
	373	}
	374	printk(KERN_ERR "CPU%d didn't die...\n", cpu);
	375	}
	376
	377	void generic_mach_cpu_die(void)
	378	{
	379	unsigned int cpu;
	380
	381	local_irq_disable();
4fcb8833	382	idle_task_exit();
1da177e4 LT	383	cpu = smp_processor_id();
	384	printk(KERN_DEBUG "CPU%d offline\n", cpu);
	385	__get_cpu_var(cpu_state) = CPU_DEAD;
0d8d4d42	386	smp_wmb();
1da177e4 LT	387	while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE)
1da177e4 LT	388	cpu_relax();
1da177e4	389	}
105765f4 BH	390
	391	void generic_set_cpu_dead(unsigned int cpu)
	392	{
	393	per_cpu(cpu_state, cpu) = CPU_DEAD;
	394	}
1da177e4 LT	395	#endif
1da177e4 LT	396
c56e5853 BH	397	struct create_idle {
	398	struct work_struct work;
	399	struct task_struct *idle;
	400	struct completion done;
	401	int cpu;
	402	};
	403
	404	static void __cpuinit do_fork_idle(struct work_struct *work)
	405	{
	406	struct create_idle *c_idle =
	407	container_of(work, struct create_idle, work);
	408
	409	c_idle->idle = fork_idle(c_idle->cpu);
	410	complete(&c_idle->done);
	411	}
	412
	413	static int __cpuinit create_idle(unsigned int cpu)
	414	{
	415	struct thread_info *ti;
	416	struct create_idle c_idle = {
	417	.cpu = cpu,
	418	.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
	419	};
	420	INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
	421
	422	c_idle.idle = get_idle_for_cpu(cpu);
	423
	424	/* We can't use kernel_thread since we must avoid to
	425	* reschedule the child. We use a workqueue because
	426	* we want to fork from a kernel thread, not whatever
	427	* userspace process happens to be trying to online us.
	428	*/
	429	if (!c_idle.idle) {
	430	schedule_work(&c_idle.work);
	431	wait_for_completion(&c_idle.done);
	432	} else
	433	init_idle(c_idle.idle, cpu);
	434	if (IS_ERR(c_idle.idle)) {
	435	pr_err("Failed fork for CPU %u: %li", cpu, PTR_ERR(c_idle.idle));
	436	return PTR_ERR(c_idle.idle);
	437	}
	438	ti = task_thread_info(c_idle.idle);
	439
	440	#ifdef CONFIG_PPC64
	441	paca[cpu].__current = c_idle.idle;
	442	paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
	443	#endif
	444	ti->cpu = cpu;
	445	current_set[cpu] = ti;
	446
	447	return 0;
	448	}
	449
b282b6f8	450	int __cpuinit __cpu_up(unsigned int cpu)
1da177e4	451	{
c56e5853	452	int rc, c;
1da177e4	453
5ad57078	454	secondary_ti = current_set[cpu];
1da177e4	455
8cffc6ac BH	456	if (smp_ops == NULL \|\|
8cffc6ac BH	457	(smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
1da177e4 LT	458	return -EINVAL;
1da177e4 LT	459
c56e5853 BH	460	/* Make sure we have an idle thread */
	461	rc = create_idle(cpu);
	462	if (rc)
	463	return rc;
	464
1da177e4 LT	465	/* Make sure callin-map entry is 0 (can be leftover a CPU
	466	* hotplug
	467	*/
	468	cpu_callin_map[cpu] = 0;
	469
	470	/* The information for processor bringup must
	471	* be written out to main store before we release
	472	* the processor.
	473	*/
0d8d4d42	474	smp_mb();
1da177e4 LT	475
	476	/* wake up cpus */
	477	DBG("smp: kicking cpu %d\n", cpu);
de300974 ME	478	rc = smp_ops->kick_cpu(cpu);
	479	if (rc) {
	480	pr_err("smp: failed starting cpu %d (rc %d)\n", cpu, rc);
	481	return rc;
	482	}
1da177e4 LT	483
	484	/*
	485	* wait to see if the cpu made a callin (is actually up).
	486	* use this value that I found through experimentation.
	487	* -- Cort
	488	*/
	489	if (system_state < SYSTEM_RUNNING)
ee0339f2	490	for (c = 50000; c && !cpu_callin_map[cpu]; c--)
1da177e4 LT	491	udelay(100);
	492	#ifdef CONFIG_HOTPLUG_CPU
	493	else
	494	/*
	495	* CPUs can take much longer to come up in the
	496	* hotplug case. Wait five seconds.
	497	*/
67764263 GS	498	for (c = 5000; c && !cpu_callin_map[cpu]; c--)
67764263 GS	499	msleep(1);
1da177e4 LT	500	#endif
	501
	502	if (!cpu_callin_map[cpu]) {
6685a477	503	printk(KERN_ERR "Processor %u is stuck.\n", cpu);
1da177e4 LT	504	return -ENOENT;
	505	}
	506
6685a477	507	DBG("Processor %u found.\n", cpu);
1da177e4 LT	508
	509	if (smp_ops->give_timebase)
	510	smp_ops->give_timebase();
	511
	512	/* Wait until cpu puts itself in the online map */
	513	while (!cpu_online(cpu))
	514	cpu_relax();
	515
	516	return 0;
	517	}
	518
e9efed3b NL	519	/* Return the value of the reg property corresponding to the given
	520	* logical cpu.
	521	*/
	522	int cpu_to_core_id(int cpu)
	523	{
	524	struct device_node *np;
	525	const int *reg;
	526	int id = -1;
	527
	528	np = of_get_cpu_node(cpu, NULL);
	529	if (!np)
	530	goto out;
	531
	532	reg = of_get_property(np, "reg", NULL);
	533	if (!reg)
	534	goto out;
	535
	536	id = *reg;
	537	out:
	538	of_node_put(np);
	539	return id;
	540	}
	541
99d86705 VS	542	/* Helper routines for cpu to core mapping */
	543	int cpu_core_index_of_thread(int cpu)
	544	{
	545	return cpu >> threads_shift;
	546	}
	547	EXPORT_SYMBOL_GPL(cpu_core_index_of_thread);
	548
	549	int cpu_first_thread_of_core(int core)
	550	{
	551	return core << threads_shift;
	552	}
	553	EXPORT_SYMBOL_GPL(cpu_first_thread_of_core);
	554
104699c0	555	/* Must be called when no change can occur to cpu_present_mask,
440a0857 NL	556	* i.e. during cpu online or offline.
	557	*/
	558	static struct device_node *cpu_to_l2cache(int cpu)
	559	{
	560	struct device_node *np;
b2ea25b9	561	struct device_node *cache;
440a0857 NL	562
	563	if (!cpu_present(cpu))
	564	return NULL;
	565
	566	np = of_get_cpu_node(cpu, NULL);
	567	if (np == NULL)
	568	return NULL;
	569
b2ea25b9 NL	570	cache = of_find_next_cache_node(np);
b2ea25b9 NL	571
440a0857 NL	572	of_node_put(np);
440a0857 NL	573
b2ea25b9	574	return cache;
440a0857	575	}
1da177e4 LT	576
1da177e4 LT	577	/* Activate a secondary processor. */
fa3f82c8	578	void __devinit start_secondary(void *unused)
1da177e4 LT	579	{
1da177e4 LT	580	unsigned int cpu = smp_processor_id();
440a0857	581	struct device_node *l2_cache;
e2075f79	582	int i, base;
1da177e4 LT	583
	584	atomic_inc(&init_mm.mm_count);
	585	current->active_mm = &init_mm;
	586
	587	smp_store_cpu_info(cpu);
5ad57078	588	set_dec(tb_ticks_per_jiffy);
e4d76e1c	589	preempt_disable();
1da177e4 LT	590	cpu_callin_map[cpu] = 1;
1da177e4 LT	591
757cbd46 KG	592	if (smp_ops->setup_cpu)
757cbd46 KG	593	smp_ops->setup_cpu(cpu);
1da177e4 LT	594	if (smp_ops->take_timebase)
	595	smp_ops->take_timebase();
	596
d831d0b8 TB	597	secondary_cpu_time_init();
d831d0b8 TB	598
aeeafbfa BH	599	#ifdef CONFIG_PPC64
	600	if (system_state == SYSTEM_RUNNING)
	601	vdso_data->processorCount++;
	602	#endif
b7d7a240	603	ipi_call_lock();
e545a614	604	notify_cpu_starting(cpu);
ea0f1cab	605	set_cpu_online(cpu, true);
e2075f79	606	/* Update sibling maps */
99d86705	607	base = cpu_first_thread_sibling(cpu);
e2075f79 NL	608	for (i = 0; i < threads_per_core; i++) {
	609	if (cpu_is_offline(base + i))
	610	continue;
cc1ba8ea AB	611	cpumask_set_cpu(cpu, cpu_sibling_mask(base + i));
cc1ba8ea AB	612	cpumask_set_cpu(base + i, cpu_sibling_mask(cpu));
440a0857 NL	613
	614	/* cpu_core_map should be a superset of
	615	* cpu_sibling_map even if we don't have cache
	616	* information, so update the former here, too.
	617	*/
cc1ba8ea AB	618	cpumask_set_cpu(cpu, cpu_core_mask(base + i));
cc1ba8ea AB	619	cpumask_set_cpu(base + i, cpu_core_mask(cpu));
e2075f79	620	}
440a0857 NL	621	l2_cache = cpu_to_l2cache(cpu);
	622	for_each_online_cpu(i) {
	623	struct device_node *np = cpu_to_l2cache(i);
	624	if (!np)
	625	continue;
	626	if (np == l2_cache) {
cc1ba8ea AB	627	cpumask_set_cpu(cpu, cpu_core_mask(i));
cc1ba8ea AB	628	cpumask_set_cpu(i, cpu_core_mask(cpu));
440a0857 NL	629	}
	630	of_node_put(np);
	631	}
	632	of_node_put(l2_cache);
b7d7a240	633	ipi_call_unlock();
1da177e4 LT	634
	635	local_irq_enable();
	636
	637	cpu_idle();
fa3f82c8 BH	638
fa3f82c8 BH	639	BUG();
1da177e4 LT	640	}
	641
	642	int setup_profiling_timer(unsigned int multiplier)
	643	{
	644	return 0;
	645	}
	646
	647	void __init smp_cpus_done(unsigned int max_cpus)
	648	{
bfb9126d	649	cpumask_var_t old_mask;
1da177e4 LT	650
	651	/* We want the setup_cpu() here to be called from CPU 0, but our
	652	* init thread may have been "borrowed" by another CPU in the meantime
	653	* se we pin us down to CPU 0 for a short while
	654	*/
bfb9126d	655	alloc_cpumask_var(&old_mask, GFP_NOWAIT);
104699c0	656	cpumask_copy(old_mask, tsk_cpus_allowed(current));
21dbeb91	657	set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
1da177e4	658
757cbd46	659	if (smp_ops && smp_ops->setup_cpu)
8cffc6ac	660	smp_ops->setup_cpu(boot_cpuid);
1da177e4	661
bfb9126d AB	662	set_cpus_allowed_ptr(current, old_mask);
	663
	664	free_cpumask_var(old_mask);
4b703a23	665
d7294445 BH	666	if (smp_ops && smp_ops->bringup_done)
	667	smp_ops->bringup_done();
	668
4b703a23	669	dump_numa_cpu_topology();
d7294445	670
1da177e4 LT	671	}
1da177e4 LT	672
e1f0ece1 MN	673	int arch_sd_sibling_asym_packing(void)
	674	{
	675	if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
	676	printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
	677	return SD_ASYM_PACKING;
	678	}
	679	return 0;
	680	}
	681
1da177e4 LT	682	#ifdef CONFIG_HOTPLUG_CPU
	683	int __cpu_disable(void)
	684	{
440a0857	685	struct device_node *l2_cache;
e2075f79 NL	686	int cpu = smp_processor_id();
	687	int base, i;
	688	int err;
1da177e4	689
e2075f79 NL	690	if (!smp_ops->cpu_disable)
	691	return -ENOSYS;
	692
	693	err = smp_ops->cpu_disable();
	694	if (err)
	695	return err;
	696
	697	/* Update sibling maps */
99d86705	698	base = cpu_first_thread_sibling(cpu);
e2075f79	699	for (i = 0; i < threads_per_core; i++) {
cc1ba8ea AB	700	cpumask_clear_cpu(cpu, cpu_sibling_mask(base + i));
	701	cpumask_clear_cpu(base + i, cpu_sibling_mask(cpu));
	702	cpumask_clear_cpu(cpu, cpu_core_mask(base + i));
	703	cpumask_clear_cpu(base + i, cpu_core_mask(cpu));
440a0857 NL	704	}
	705
	706	l2_cache = cpu_to_l2cache(cpu);
	707	for_each_present_cpu(i) {
	708	struct device_node *np = cpu_to_l2cache(i);
	709	if (!np)
	710	continue;
	711	if (np == l2_cache) {
cc1ba8ea AB	712	cpumask_clear_cpu(cpu, cpu_core_mask(i));
cc1ba8ea AB	713	cpumask_clear_cpu(i, cpu_core_mask(cpu));
440a0857 NL	714	}
440a0857 NL	715	of_node_put(np);
e2075f79	716	}
440a0857 NL	717	of_node_put(l2_cache);
440a0857 NL	718
e2075f79 NL	719
e2075f79 NL	720	return 0;
1da177e4 LT	721	}
	722
	723	void __cpu_die(unsigned int cpu)
	724	{
	725	if (smp_ops->cpu_die)
	726	smp_ops->cpu_die(cpu);
	727	}
d0174c72 NF	728
	729	static DEFINE_MUTEX(powerpc_cpu_hotplug_driver_mutex);
	730
	731	void cpu_hotplug_driver_lock()
	732	{
	733	mutex_lock(&powerpc_cpu_hotplug_driver_mutex);
	734	}
	735
	736	void cpu_hotplug_driver_unlock()
	737	{
	738	mutex_unlock(&powerpc_cpu_hotplug_driver_mutex);
	739	}
abb17f9c MM	740
	741	void cpu_die(void)
	742	{
	743	if (ppc_md.cpu_die)
	744	ppc_md.cpu_die();
fa3f82c8 BH	745
	746	/* If we return, we re-enter start_secondary */
	747	start_secondary_resume();
abb17f9c	748	}
fa3f82c8	749
1da177e4	750	#endif