/*
* linux/arch/arm/kernel/smp.c
*
* Copyright (C) 2002 ARM Limited, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/cache.h>
#include <linux/profile.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#include <asm/atomic.h>
#include <asm/cacheflush.h>
#include <asm/cpu.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
/*
* bitmask of present and online CPUs.
* The present bitmask indicates that the CPU is physically present.
* The online bitmask indicates that the CPU is up and running.
*/
cpumask_t cpu_possible_map;
EXPORT_SYMBOL(cpu_possible_map);
cpumask_t cpu_online_map;
EXPORT_SYMBOL(cpu_online_map);
/*
* as from 2.5, kernels no longer have an init_tasks structure
* so we need some other way of telling a new secondary core
* where to place its SVC stack
*/
struct secondary_data secondary_data;
/*
* structures for inter-processor calls
* - A collection of single bit ipi messages.
*/
struct ipi_data {
spinlock_t lock;
unsigned long ipi_count;
unsigned long bits;
};
static DEFINE_PER_CPU(struct ipi_data, ipi_data) = {
.lock = SPIN_LOCK_UNLOCKED,
};
enum ipi_msg_type {
IPI_TIMER,
IPI_RESCHEDULE,
IPI_CALL_FUNC,
IPI_CPU_STOP,
};
struct smp_call_struct {
void (*func)(void *info);
void *info;
int wait;
cpumask_t pending;
cpumask_t unfinished;
};
static struct smp_call_struct * volatile smp_call_function_data;
static DEFINE_SPINLOCK(smp_call_function_lock);
int __cpuinit __cpu_up(unsigned int cpu)
{
struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
struct task_struct *idle = ci->idle;
pgd_t *pgd;
pmd_t *pmd;
int ret;
/*
* Spawn a new process manually, if not already done.
* Grab a pointer to its task struct so we can mess with it
*/
if (!idle) {
idle = fork_idle(cpu);
if (IS_ERR(idle)) {
printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
return PTR_ERR(idle);
}
ci->idle = idle;
}
/*
* Allocate initial page tables to allow the new CPU to
* enable the MMU safely. This essentially means a set
* of our "standard" page tables, with the addition of
* a 1:1 mapping for the physical address of the kernel.
*/
pgd = pgd_alloc(&init_mm);
pmd = pmd_offset(pgd, PHYS_OFFSET);
*pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) |
PMD_TYPE_SECT | PMD_SECT_AP_WRITE);
/*
* We need to tell the secondary core where to find
* its stack and the page tables.
*/
secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
secondary_data.pgdir = virt_to_phys(pgd);
wmb();
/*
* Now bring the CPU into our world.
*/
ret = boot_secondary(cpu, idle);
if (ret == 0) {
unsigned long timeout;
/*
* CPU was successfully started, wait for it
* to come online or time out.
*/
timeout = jiffies + HZ;
while (time_before(jiffies, timeout)) {
if (cpu_online(cpu))
break;
udelay(10);
barrier();
}
if (!cpu_online(cpu))
ret = -EIO;
}
secondary_data.stack = NULL;
secondary_data.pgdir = 0;
*pmd_offset(pgd, PHYS_OFFSET) = __pmd(0);
pgd_free(&init_mm, pgd);
if (ret) {
printk(KERN_CRIT "CPU%u: processor failed to boot\n", cpu);
/*
* FIXME: We need to clean up the new idle thread. --rmk
*/
}
return ret;
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* __cpu_disable runs on the processor to be shutdown.
*/
int __cpuexit __cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
struct task_struct *p;
int ret;
ret = mach_cpu_disable(cpu);
if (ret)
return ret;
/*
* Take this CPU offline. Once we clear this, we can't return,
* and we must not schedule until we're ready to give up the cpu.
*/
cpu_clear(cpu, cpu_online_map);
/*
* OK - migrate IRQs away from this CPU
*/
migrate_irqs();
/*
* Stop the local timer for this CPU.
*/
local_timer_stop(cpu);
/*
* Flush user cache and TLB mappings, and then remove this CPU
* from the vm mask set of all processes.
*/
flush_cache_all();
local_flush_tlb_all();
read_lock(&tasklist_lock);
for_each_process(p) {
if (p->mm)
cpu_clear(cpu, p->mm->cpu_vm_mask);
}
read_unlock(&tasklist_lock);
return 0;
}
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpuexit __cpu_die(unsigned int cpu)
{
if (!platform_cpu_kill(cpu))
printk("CPU%u: unable to kill\n", cpu);
}
/*
* Called from the idle thread for the CPU which has been shutdown.
*
* Note that we disable IRQs here, but do not re-enable them
* before returning to the caller. This is also the behaviour
* of the other hotplug-cpu capable cores, so presumably coming
* out of idle fixes this.
*/
void __cpuexit cpu_die(void)
{
unsigned int cpu = smp_processor_id();
local_irq_disable();
idle_task_exit();
/*
* actual CPU shutdown procedure is at least platform (if not
* CPU) specific
*/
platform_cpu_die(cpu);
/*
* Do not return to the idle loop - jump back to the secondary
* cpu initialisation. There's some initialisation which needs
* to be repeated to undo the effects of taking the CPU offline.
*/
__asm__("mov sp, %0\n"
" b secondary_start_kernel"
:
: "r" (task_stack_page(current) + THREAD_SIZE - 8));
}
#endif /* CONFIG_HOTPLUG_CPU */
/*
* This is the secondary CPU boot entry. We're using this CPUs
* idle thread stack, but a set of temporary page tables.
*/
asmlinkage void __cpuinit secondary_start_kernel(void)
{
struct mm_struct *mm = &init_mm;
unsigned int cpu = smp_processor_id();
printk("CPU%u: Booted secondary processor\n", cpu);
/*
* All kernel threads share the same mm context; grab a
* reference and switch to it.
*/
atomic_inc(&mm->mm_users);
atomic_inc(&mm->mm_count);
current->active_mm = mm;
cpu_set(cpu, mm->cpu_vm_mask);
cpu_switch_mm(mm->pgd, mm);
enter_lazy_tlb(mm, current);
local_flush_tlb_all();
cpu_init();
preempt_disable();
/*
* Give the platform a chance to do its own initialisation.
*/
platform_secondary_init(cpu);
/*
* Enable local interrupts.
*/
local_irq_enable();
local_fiq_enable();
/*
* Setup local timer for this CPU.
*/
local_timer_setup(cpu);
calibrate_delay();
smp_store_cpu_info(cpu);
/*
* OK, now it's safe to let the boot CPU continue
*/
cpu_set(cpu, cpu_online_map);
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
}
/*
* Called by both boot and secondaries to move global data into
* per-processor storage.
*/
void __cpuinit smp_store_cpu_info(unsigned int cpuid)
{
struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
cpu_info->loops_per_jiffy = loops_per_jiffy;
}
void __init smp_cpus_done(unsigned int max_cpus)
{
int cpu;
unsigned long bogosum = 0;
for_each_online_cpu(cpu)
bogosum += per_cpu(cpu_data, cpu).loops_per_jiffy;
printk(KERN_INFO "SMP: Total of %d processors activated "
"(%lu.%02lu BogoMIPS).\n",
num_online_cpus(),
bogosum / (500000/HZ),
(bogosum / (5000/HZ)) % 100);
}
void __init smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
per_cpu(cpu_data, cpu).idle = current;
}
static void send_ipi_message(cpumask_t callmap, enum ipi_msg_type msg)
{
unsigned long flags;
unsigned int cpu;
local_irq_save(flags);
for_each_cpu_mask(cpu, callmap) {
struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
spin_lock(&ipi->lock);
ipi->bits |= 1 << msg;
spin_unlock(&ipi->lock);
}
/*
* Call the platform specific cross-CPU call function.
*/
smp_cross_call(callmap);
local_irq_restore(flags);
}
/*
* You must not call this function with disabled interrupts, from a
* hardware interrupt handler, nor from a bottom half handler.
*/
static int smp_call_function_on_cpu(void (*func)(void *info), void *info,
int retry, int wait, cpumask_t callmap)
{
struct smp_call_struct data;
unsigned long timeout;
int ret = 0;
data.func = func;
data.info = info;
data.wait = wait;
cpu_clear(smp_processor_id(), callmap);
if (cpus_empty(callmap))
goto out;
data.pending = callmap;
if (wait)
data.unfinished = callmap;
/*
* try to get the mutex on smp_call_function_data
*/
spin_lock(&smp_call_function_lock);
smp_call_function_data = &data;
send_ipi_message(callmap, IPI_CALL_FUNC);
timeout = jiffies + HZ;
while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
barrier();
/*
* did we time out?
*/
if (!cpus_empty(data.pending)) {
/*
* this may be causing our panic - report it
*/
printk(KERN_CRIT
"CPU%u: smp_call_function timeout for %p(%p)\n"
" callmap %lx pending %lx, %swait\n",
smp_processor_id(), func, info, *cpus_addr(callmap),
*cpus_addr(data.pending), wait ? "" : "no ");
/*
* TRACE
*/
timeout = jiffies + (5 * HZ);
while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
barrier();
if (cpus_empty(data.pending))
printk(KERN_CRIT " RESOLVED\n");
else
printk(KERN_CRIT " STILL STUCK\n");
}
/*
* whatever happened, we're done with the data, so release it
*/
smp_call_function_data = NULL;
spin_unlock(&smp_call_function_lock);
if (!cpus_empty(data.pending)) {
ret = -ETIMEDOUT;
goto out;
}
if (wait)
while (!cpus_empty(data.unfinished))
barrier();
out:
return 0;
}
int smp_call_function(void (*func)(void *info), void *info, int retry,
int wait)
{
return smp_call_function_on_cpu(func, info, retry, wait,
cpu_online_map);
}
EXPORT_SYMBOL_GPL(smp_call_function);
int smp_call_function_single(int cpu, void (*func)(void *info), void *info,
int retry, int wait)
{
/* prevent preemption and reschedule on another processor */
int current_cpu = get_cpu();
int ret = 0;
if (cpu == current_cpu) {
local_irq_disable();
func(info);
local_irq_enable();
} else
ret = smp_call_function_on_cpu(func, info, retry, wait,
cpumask_of_cpu(cpu));
put_cpu();
return ret;
}
EXPORT_SYMBOL_GPL(smp_call_function_single);
void show_ipi_list(struct seq_file *p)
{
unsigned int cpu;
seq_puts(p, "IPI:");
for_each_present_cpu(cpu)
seq_printf(p, " %10lu", per_cpu(ipi_data, cpu).ipi_count);
seq_putc(p, '\n');
}
void show_local_irqs(struct seq_file *p)
{
unsigned int cpu;
seq_printf(p, "LOC: ");
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs);
seq_putc(p, '\n');
}
static void ipi_timer(void)
{
irq_enter();
local_timer_interrupt();
irq_exit();
}
#ifdef CONFIG_LOCAL_TIMERS
asmlinkage void __exception do_local_timer(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
int cpu = smp_processor_id();
if (local_timer_ack()) {
irq_stat[cpu].local_timer_irqs++;
ipi_timer();
}
set_irq_regs(old_regs);
}
#endif
/*
* ipi_call_function - handle IPI from smp_call_function()
*
* Note that we copy data out of the cross-call structure and then
* let the caller know that we're here and have done with their data
*/
static void ipi_call_function(unsigned int cpu)
{
struct smp_call_struct *data = smp_call_function_data;
void (*func)(void *info) = data->func;
void *info = data->info;
int wait = data->wait;
cpu_clear(cpu, data->pending);
func(info);
if (wait)
cpu_clear(cpu, data->unfinished);
}
static DEFINE_SPINLOCK(stop_lock);
/*
* ipi_cpu_stop - handle IPI from smp_send_stop()
*/
static void ipi_cpu_stop(unsigned int cpu)
{
spin_lock(&stop_lock);
printk(KERN_CRIT "CPU%u: stopping\n", cpu);
dump_stack();
spin_unlock(&stop_lock);
cpu_clear(cpu, cpu_online_map);
local_fiq_disable();
local_irq_disable();
while (1)
cpu_relax();
}
/*
* Main handler for inter-processor interrupts
*
* For ARM, the ipimask now only identifies a single
* category of IPI (Bit 1 IPIs have been replaced by a
* different mechanism):
*
* Bit 0 - Inter-processor function call
*/
asmlinkage void __exception do_IPI(struct pt_regs *regs)
{
unsigned int cpu = smp_processor_id();
struct ipi_data *ipi = &per_cpu(ipi_data, cpu);
struct pt_regs *old_regs = set_irq_regs(regs);
ipi->ipi_count++;
for (;;) {
unsigned long msgs;
spin_lock(&ipi->lock);
msgs = ipi->bits;
ipi->bits = 0;
spin_unlock(&ipi->lock);
if (!msgs)
break;
do {
unsigned nextmsg;
nextmsg = msgs & -msgs;
msgs &= ~nextmsg;
nextmsg = ffz(~nextmsg);
switch (nextmsg) {
case IPI_TIMER:
ipi_timer();
break;
case IPI_RESCHEDULE:
/*
* nothing more to do - eveything is
* done on the interrupt return path
*/
break;
case IPI_CALL_FUNC:
ipi_call_function(cpu);
break;
case IPI_CPU_STOP:
ipi_cpu_stop(cpu);
break;
default:
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
cpu, nextmsg);
break;
}
} while (msgs);
}
set_irq_regs(old_regs);
}
void smp_send_reschedule(int cpu)
{
send_ipi_message(cpumask_of_cpu(cpu), IPI_RESCHEDULE);
}
void smp_send_timer(void)
{
cpumask_t mask = cpu_online_map;
cpu_clear(smp_processor_id(), mask);
send_ipi_message(mask, IPI_TIMER);
}
void smp_timer_broadcast(cpumask_t mask)
{
send_ipi_message(mask, IPI_TIMER);
}
void smp_send_stop(void)
{
cpumask_t mask = cpu_online_map;
cpu_clear(smp_processor_id(), mask);
send_ipi_message(mask, IPI_CPU_STOP);
}
/*
* not supported here
*/
int setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
}
static int
on_each_cpu_mask(void (*func)(void *), void *info, int retry, int wait,
cpumask_t mask)
{
int ret = 0;
preempt_disable();
ret = smp_call_function_on_cpu(func, info, retry, wait, mask);
if (cpu_isset(smp_processor_id(), mask))
func(info);
preempt_enable();
return ret;
}
/**********************************************************************/
/*
* TLB operations
*/
struct tlb_args {
struct vm_area_struct *ta_vma;
unsigned long ta_start;
unsigned long ta_end;
};
static inline void ipi_flush_tlb_all(void *ignored)
{
local_flush_tlb_all();
}
static inline void ipi_flush_tlb_mm(void *arg)
{
struct mm_struct *mm = (struct mm_struct *)arg;
local_flush_tlb_mm(mm);
}
static inline void ipi_flush_tlb_page(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
local_flush_tlb_page(ta->ta_vma, ta->ta_start);
}
static inline void ipi_flush_tlb_kernel_page(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
local_flush_tlb_kernel_page(ta->ta_start);
}
static inline void ipi_flush_tlb_range(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end);
}
static inline void ipi_flush_tlb_kernel_range(void *arg)
{
struct tlb_args *ta = (struct tlb_args *)arg;
local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end);
}
void flush_tlb_all(void)
{
on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1);
}
void flush_tlb_mm(struct mm_struct *mm)
{
cpumask_t mask = mm->cpu_vm_mask;
on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, 1, mask);
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
cpumask_t mask = vma->vm_mm->cpu_vm_mask;
struct tlb_args ta;
ta.ta_vma = vma;
ta.ta_start = uaddr;
on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, 1, mask);
}
void flush_tlb_kernel_page(unsigned long kaddr)
{
struct tlb_args ta;
ta.ta_start = kaddr;
on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1, 1);
}
void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
cpumask_t mask = vma->vm_mm->cpu_vm_mask;
struct tlb_args ta;
ta.ta_vma = vma;
ta.ta_start = start;
ta.ta_end = end;
on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, 1, mask);
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
struct tlb_args ta;
ta.ta_start = start;
ta.ta_end = end;
on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1, 1);
}
