powerpc: Merge smp.c and smp.h

This also moves setup_cpu_maps to setup-common.c (calling it
smp_setup_cpu_maps) and uses it on both 32-bit and 64-bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 0 insertions, 568 deletions

diff --git a/arch/ppc64/kernel/smp.c b/arch/ppc64/kernel/smp.c
deleted file mode 100644
index 017c1291983..00000000000
--- a/arch/ppc64/kernel/smp.c
+++ /dev/null
@@ -1,568 +0,0 @@
-/*
- * 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/config.h>
-#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 <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/paca.h>
-#include <asm/time.h>
-#include <asm/machdep.h>
-#include <asm/cputable.h>
-#include <asm/system.h>
-#include <asm/abs_addr.h>
-#include <asm/mpic.h>
-
-#ifdef DEBUG
-#define DBG(fmt...) udbg_printf(fmt)
-#else
-#define DBG(fmt...)
-#endif
-
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-cpumask_t cpu_sibling_map[NR_CPUS] = { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
-
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(cpu_possible_map);
-
-struct smp_ops_t *smp_ops;
-
-static volatile unsigned int cpu_callin_map[NR_CPUS];
-
-void smp_call_function_interrupt(void);
-
-int smt_enabled_at_boot = 1;
-
-#ifdef CONFIG_MPIC
-int __init smp_mpic_probe(void)
-{
-	int nr_cpus;
-
-	DBG("smp_mpic_probe()...\n");
-
-	nr_cpus = cpus_weight(cpu_possible_map);
-
-	DBG("nr_cpus: %d\n", nr_cpus);
-
-	if (nr_cpus > 1)
-		mpic_request_ipis();
-
-	return nr_cpus;
-}
-
-void __devinit smp_mpic_setup_cpu(int cpu)
-{
-	mpic_setup_this_cpu();
-}
-
-void __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();
-}
-
-#endif /* CONFIG_MPIC */
-
-void smp_message_recv(int msg, struct pt_regs *regs)
-{
-	switch(msg) {
-	case PPC_MSG_CALL_FUNCTION:
-		smp_call_function_interrupt();
-		break;
-	case PPC_MSG_RESCHEDULE: 
-		/* XXX Do we have to do this? */
-		set_need_resched();
-		break;
-#if 0
-	case PPC_MSG_MIGRATE_TASK:
-		/* spare */
-		break;
-#endif
-#ifdef CONFIG_DEBUGGER
-	case PPC_MSG_DEBUGGER_BREAK:
-		debugger_ipi(regs);
-		break;
-#endif
-	default:
-		printk("SMP %d: smp_message_recv(): unknown msg %d\n",
-		       smp_processor_id(), msg);
-		break;
-	}
-}
-
-void smp_send_reschedule(int cpu)
-{
-	smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
-}
-
-#ifdef CONFIG_DEBUGGER
-void smp_send_debugger_break(int cpu)
-{
-	smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
-}
-#endif
-
-static void stop_this_cpu(void *dummy)
-{
-	local_irq_disable();
-	while (1)
-		;
-}
-
-void smp_send_stop(void)
-{
-	smp_call_function(stop_this_cpu, NULL, 1, 0);
-}
-
-/*
- * Structure and data for smp_call_function(). This is designed to minimise
- * static memory requirements. It also looks cleaner.
- * Stolen from the i386 version.
- */
-static  __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
-
-static struct call_data_struct {
-	void (*func) (void *info);
-	void *info;
-	atomic_t started;
-	atomic_t finished;
-	int wait;
-} *call_data;
-
-/* delay of at least 8 seconds on 1GHz cpu */
-#define SMP_CALL_TIMEOUT (1UL << (30 + 3))
-
-/*
- * This function sends a 'generic call function' IPI to all other CPUs
- * in the system.
- *
- * [SUMMARY] Run a function on all other CPUs.
- * <func> The function to run. This must be fast and non-blocking.
- * <info> An arbitrary pointer to pass to the function.
- * <nonatomic> currently unused.
- * <wait> If true, wait (atomically) until function has completed on other CPUs.
- * [RETURNS] 0 on success, else a negative status code. Does not return until
- * remote CPUs are nearly ready to execute <<func>> or are or have executed.
- *
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
-		       int wait)
-{ 
-	struct call_data_struct data;
-	int ret = -1, cpus;
-	unsigned long timeout;
-
-	/* Can deadlock when called with interrupts disabled */
-	WARN_ON(irqs_disabled());
-
-	data.func = func;
-	data.info = info;
-	atomic_set(&data.started, 0);
-	data.wait = wait;
-	if (wait)
-		atomic_set(&data.finished, 0);
-
-	spin_lock(&call_lock);
-	/* Must grab online cpu count with preempt disabled, otherwise
-	 * it can change. */
-	cpus = num_online_cpus() - 1;
-	if (!cpus) {
-		ret = 0;
-		goto out;
-	}
-
-	call_data = &data;
-	smp_wmb();
-	/* Send a message to all other CPUs and wait for them to respond */
-	smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION);
-
-	/* Wait for response */
-	timeout = SMP_CALL_TIMEOUT;
-	while (atomic_read(&data.started) != cpus) {
-		HMT_low();
-		if (--timeout == 0) {
-			printk("smp_call_function on cpu %d: other cpus not "
-			       "responding (%d)\n", smp_processor_id(),
-			       atomic_read(&data.started));
-			debugger(NULL);
-			goto out;
-		}
-	}
-
-	if (wait) {
-		timeout = SMP_CALL_TIMEOUT;
-		while (atomic_read(&data.finished) != cpus) {
-			HMT_low();
-			if (--timeout == 0) {
-				printk("smp_call_function on cpu %d: other "
-				       "cpus not finishing (%d/%d)\n",
-				       smp_processor_id(),
-				       atomic_read(&data.finished),
-				       atomic_read(&data.started));
-				debugger(NULL);
-				goto out;
-			}
-		}
-	}
-
-	ret = 0;
-
-out:
-	call_data = NULL;
-	HMT_medium();
-	spin_unlock(&call_lock);
-	return ret;
-}
-
-EXPORT_SYMBOL(smp_call_function);
-
-void smp_call_function_interrupt(void)
-{
-	void (*func) (void *info);
-	void *info;
-	int wait;
-
-	/* call_data will be NULL if the sender timed out while
-	 * waiting on us to receive the call.
-	 */
-	if (!call_data)
-		return;
-
-	func = call_data->func;
-	info = call_data->info;
-	wait = call_data->wait;
-
-	if (!wait)
-		smp_mb__before_atomic_inc();
-
-	/*
-	 * Notify initiating CPU that I've grabbed the data and am
-	 * about to execute the function
-	 */
-	atomic_inc(&call_data->started);
-	/*
-	 * At this point the info structure may be out of scope unless wait==1
-	 */
-	(*func)(info);
-	if (wait) {
-		smp_mb__before_atomic_inc();
-		atomic_inc(&call_data->finished);
-	}
-}
-
-extern struct gettimeofday_struct do_gtod;
-
-struct thread_info *current_set[NR_CPUS];
-
-DECLARE_PER_CPU(unsigned int, pvr);
-
-static void __devinit smp_store_cpu_info(int id)
-{
-	per_cpu(pvr, id) = mfspr(SPRN_PVR);
-}
-
-static void __init smp_create_idle(unsigned int cpu)
-{
-	struct task_struct *p;
-
-	/* create a process for the processor */
-	p = fork_idle(cpu);
-	if (IS_ERR(p))
-		panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p));
-	paca[cpu].__current = p;
-	current_set[cpu] = p->thread_info;
-}
-
-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;
-
-#ifndef CONFIG_PPC_ISERIES
-	paca[boot_cpuid].next_jiffy_update_tb = tb_last_stamp = get_tb();
-
-	/*
-	 * Should update do_gtod.stamp_xsec.
-	 * For now we leave it which means the time can be some
-	 * number of msecs off until someone does a settimeofday()
-	 */
-	do_gtod.varp->tb_orig_stamp = tb_last_stamp;
-	systemcfg->tb_orig_stamp = tb_last_stamp;
-#endif
-
-	max_cpus = smp_ops->probe();
- 
-	smp_space_timers(max_cpus);
-
-	for_each_cpu(cpu)
-		if (cpu != boot_cpuid)
-			smp_create_idle(cpu);
-}
-
-void __devinit smp_prepare_boot_cpu(void)
-{
-	BUG_ON(smp_processor_id() != boot_cpuid);
-
-	cpu_set(boot_cpuid, cpu_online_map);
-
-	paca[boot_cpuid].__current = current;
-	current_set[boot_cpuid] = current->thread_info;
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/* State of each CPU during hotplug phases */
-DEFINE_PER_CPU(int, cpu_state) = { 0 };
-
-int generic_cpu_disable(void)
-{
-	unsigned int cpu = smp_processor_id();
-
-	if (cpu == boot_cpuid)
-		return -EBUSY;
-
-	systemcfg->processorCount--;
-	cpu_clear(cpu, cpu_online_map);
-	fixup_irqs(cpu_online_map);
-	return 0;
-}
-
-int generic_cpu_enable(unsigned int cpu)
-{
-	/* Do the normal bootup if we haven't
-	 * already bootstrapped. */
-	if (system_state != SYSTEM_RUNNING)
-		return -ENOSYS;
-
-	/* get the target out of it's holding state */
-	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
-	smp_wmb();
-
-	while (!cpu_online(cpu))
-		cpu_relax();
-
-	fixup_irqs(cpu_online_map);
-	/* counter the irq disable in fixup_irqs */
-	local_irq_enable();
-	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();
-	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();
-
-	flush_tlb_pending();
-	cpu_set(cpu, cpu_online_map);
-	local_irq_enable();
-}
-#endif
-
-static int __devinit cpu_enable(unsigned int cpu)
-{
-	if (smp_ops->cpu_enable)
-		return smp_ops->cpu_enable(cpu);
-
-	return -ENOSYS;
-}
-
-int __devinit __cpu_up(unsigned int cpu)
-{
-	int c;
-
-	if (!cpu_enable(cpu))
-		return 0;
-
-	if (smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu))
-		return -EINVAL;
-
-	paca[cpu].default_decr = tb_ticks_per_jiffy;
-
-	/* 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);
-	smp_ops->kick_cpu(cpu);
-
-	/*
-	 * 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 = 5000; 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 = 25; c && !cpu_callin_map[cpu]; c--) {
-			msleep(200);
-		}
-#endif
-
-	if (!cpu_callin_map[cpu]) {
-		printk("Processor %u is stuck.\n", cpu);
-		return -ENOENT;
-	}
-
-	printk("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;
-}
-
-
-/* Activate a secondary processor. */
-int __devinit start_secondary(void *unused)
-{
-	unsigned int cpu = smp_processor_id();
-
-	atomic_inc(&init_mm.mm_count);
-	current->active_mm = &init_mm;
-
-	smp_store_cpu_info(cpu);
-	set_dec(paca[cpu].default_decr);
-	cpu_callin_map[cpu] = 1;
-
-	smp_ops->setup_cpu(cpu);
-	if (smp_ops->take_timebase)
-		smp_ops->take_timebase();
-
-	spin_lock(&call_lock);
-	cpu_set(cpu, cpu_online_map);
-	spin_unlock(&call_lock);
-
-	local_irq_enable();
-
-	cpu_idle();
-	return 0;
-}
-
-int setup_profiling_timer(unsigned int multiplier)
-{
-	return 0;
-}
-
-void __init smp_cpus_done(unsigned int max_cpus)
-{
-	cpumask_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
-	 */
-	old_mask = current->cpus_allowed;
-	set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid));
-	
-	smp_ops->setup_cpu(boot_cpuid);
-
-	set_cpus_allowed(current, old_mask);
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-int __cpu_disable(void)
-{
-	if (smp_ops->cpu_disable)
-		return smp_ops->cpu_disable();
-
-	return -ENOSYS;
-}
-
-void __cpu_die(unsigned int cpu)
-{
-	if (smp_ops->cpu_die)
-		smp_ops->cpu_die(cpu);
-}
-#endif