786 lines
17 KiB
C
786 lines
17 KiB
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/export.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/device.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/topology.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <linux/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/mpic.h>
|
|
#include <asm/vdso_datapage.h>
|
|
#ifdef CONFIG_PPC64
|
|
#include <asm/paca.h>
|
|
#endif
|
|
#include <asm/vdso.h>
|
|
#include <asm/debug.h>
|
|
|
|
#ifdef DEBUG
|
|
#include <asm/udbg.h>
|
|
#define DBG(fmt...) udbg_printf(fmt)
|
|
#else
|
|
#define DBG(fmt...)
|
|
#endif
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/* State of each CPU during hotplug phases */
|
|
static DEFINE_PER_CPU(int, cpu_state) = { 0 };
|
|
#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 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
|
|
*/
|
|
if (!paca[nr].cpu_start) {
|
|
paca[nr].cpu_start = 1;
|
|
smp_mb();
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/*
|
|
* Ok it's not there, so it might be soft-unplugged, let's
|
|
* try to bring it back
|
|
*/
|
|
generic_set_cpu_up(nr);
|
|
smp_wmb();
|
|
smp_send_reschedule(nr);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
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)
|
|
{
|
|
scheduler_ipi();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t call_function_single_action(int irq, void *data)
|
|
{
|
|
generic_smp_call_function_single_interrupt();
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static 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_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND,
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_SMP_MUXED_IPI
|
|
struct cpu_messages {
|
|
int messages; /* current messages */
|
|
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);
|
|
char *message = (char *)&info->messages;
|
|
|
|
/*
|
|
* Order previous accesses before accesses in the IPI handler.
|
|
*/
|
|
smp_mb();
|
|
message[msg] = 1;
|
|
/*
|
|
* cause_ipi functions are required to include a full barrier
|
|
* before doing whatever causes the IPI.
|
|
*/
|
|
smp_ops->cause_ipi(cpu, info->data);
|
|
}
|
|
|
|
irqreturn_t smp_ipi_demux(void)
|
|
{
|
|
struct cpu_messages *info = &__get_cpu_var(ipi_message);
|
|
unsigned int all;
|
|
|
|
mb(); /* order any irq clear */
|
|
|
|
do {
|
|
all = xchg(&info->messages, 0);
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNCTION)))
|
|
generic_smp_call_function_interrupt();
|
|
if (all & (1 << (24 - 8 * PPC_MSG_RESCHEDULE)))
|
|
scheduler_ipi();
|
|
if (all & (1 << (24 - 8 * PPC_MSG_CALL_FUNC_SINGLE)))
|
|
generic_smp_call_function_single_interrupt();
|
|
if (all & (1 << (24 - 8 * PPC_MSG_DEBUGGER_BREAK)))
|
|
debug_ipi_action(0, NULL);
|
|
#else
|
|
#error Unsupported ENDIAN
|
|
#endif
|
|
} while (info->messages);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
#endif /* CONFIG_PPC_SMP_MUXED_IPI */
|
|
|
|
static inline void do_message_pass(int cpu, int msg)
|
|
{
|
|
if (smp_ops->message_pass)
|
|
smp_ops->message_pass(cpu, msg);
|
|
#ifdef CONFIG_PPC_SMP_MUXED_IPI
|
|
else
|
|
smp_muxed_ipi_message_pass(cpu, msg);
|
|
#endif
|
|
}
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
{
|
|
if (likely(smp_ops))
|
|
do_message_pass(cpu, PPC_MSG_RESCHEDULE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(smp_send_reschedule);
|
|
|
|
void arch_send_call_function_single_ipi(int cpu)
|
|
{
|
|
do_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)
|
|
do_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)
|
|
do_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 smp_store_cpu_info(int id)
|
|
{
|
|
per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
|
|
#ifdef CONFIG_PPC_FSL_BOOK3E
|
|
per_cpu(next_tlbcam_idx, id)
|
|
= (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
|
|
#endif
|
|
}
|
|
|
|
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 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
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* The cpu_state should be set to CPU_UP_PREPARE in kick_cpu(), otherwise
|
|
* the cpu_state is always CPU_DEAD after calling generic_set_cpu_dead(),
|
|
* which makes the delay in generic_cpu_die() not happen.
|
|
*/
|
|
void generic_set_cpu_up(unsigned int cpu)
|
|
{
|
|
per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
|
|
}
|
|
|
|
int generic_check_cpu_restart(unsigned int cpu)
|
|
{
|
|
return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
|
|
}
|
|
|
|
static atomic_t secondary_inhibit_count;
|
|
|
|
/*
|
|
* Don't allow secondary CPU threads to come online
|
|
*/
|
|
void inhibit_secondary_onlining(void)
|
|
{
|
|
/*
|
|
* This makes secondary_inhibit_count stable during cpu
|
|
* online/offline operations.
|
|
*/
|
|
get_online_cpus();
|
|
|
|
atomic_inc(&secondary_inhibit_count);
|
|
put_online_cpus();
|
|
}
|
|
EXPORT_SYMBOL_GPL(inhibit_secondary_onlining);
|
|
|
|
/*
|
|
* Allow secondary CPU threads to come online again
|
|
*/
|
|
void uninhibit_secondary_onlining(void)
|
|
{
|
|
get_online_cpus();
|
|
atomic_dec(&secondary_inhibit_count);
|
|
put_online_cpus();
|
|
}
|
|
EXPORT_SYMBOL_GPL(uninhibit_secondary_onlining);
|
|
|
|
static int secondaries_inhibited(void)
|
|
{
|
|
return atomic_read(&secondary_inhibit_count);
|
|
}
|
|
|
|
#else /* HOTPLUG_CPU */
|
|
|
|
#define secondaries_inhibited() 0
|
|
|
|
#endif
|
|
|
|
static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
struct thread_info *ti = task_thread_info(idle);
|
|
|
|
#ifdef CONFIG_PPC64
|
|
paca[cpu].__current = idle;
|
|
paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
|
|
#endif
|
|
ti->cpu = cpu;
|
|
secondary_ti = current_set[cpu] = ti;
|
|
}
|
|
|
|
int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
|
|
{
|
|
int rc, c;
|
|
|
|
/*
|
|
* Don't allow secondary threads to come online if inhibited
|
|
*/
|
|
if (threads_per_core > 1 && secondaries_inhibited() &&
|
|
cpu % threads_per_core != 0)
|
|
return -EBUSY;
|
|
|
|
if (smp_ops == NULL ||
|
|
(smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
|
|
return -EINVAL;
|
|
|
|
cpu_idle_thread_init(cpu, tidle);
|
|
|
|
/* 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. */
|
|
__cpuinit void 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++;
|
|
|
|
vdso_getcpu_init();
|
|
#endif
|
|
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);
|
|
|
|
local_irq_enable();
|
|
|
|
cpu_startup_entry(CPUHP_ONLINE);
|
|
|
|
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
|