*
* SMP support for the SuperH processors.
*
- * Copyright (C) 2002, 2003 Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright (C) 2006 - 2007 Akio Idehara
*
- * 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.
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
*/
-
#include <linux/err.h>
#include <linux/cache.h>
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/init.h>
-#include <linux/interrupt.h>
#include <linux/spinlock.h>
-#include <linux/threads.h>
+#include <linux/mm.h>
#include <linux/module.h>
-#include <linux/time.h>
-#include <linux/timex.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-
+#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
+#include <asm/cacheflush.h>
+#include <asm/sections.h>
-/*
- * This was written with the Sega Saturn (SMP SH-2 7604) in mind,
- * but is designed to be usable regardless if there's an MMU
- * present or not.
- */
-struct sh_cpuinfo cpu_data[NR_CPUS];
-
-extern void per_cpu_trap_init(void);
+int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
+int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
cpumask_t cpu_possible_map;
EXPORT_SYMBOL(cpu_possible_map);
cpumask_t cpu_online_map;
EXPORT_SYMBOL(cpu_online_map);
-static atomic_t cpus_booted = ATOMIC_INIT(0);
-
-/* These are defined by the board-specific code. */
-/*
- * Cause the function described by call_data to be executed on the passed
- * cpu. When the function has finished, increment the finished field of
- * call_data.
- */
-void __smp_send_ipi(unsigned int cpu, unsigned int action);
-
-/*
- * Find the number of available processors
- */
-unsigned int __smp_probe_cpus(void);
-
-/*
- * Start a particular processor
- */
-void __smp_slave_init(unsigned int cpu);
+static atomic_t cpus_booted = ATOMIC_INIT(0);
/*
* Run specified function on a particular processor.
static inline void __init smp_store_cpu_info(unsigned int cpu)
{
- cpu_data[cpu].loops_per_jiffy = loops_per_jiffy;
+ struct sh_cpuinfo *c = cpu_data + cpu;
+
+ c->loops_per_jiffy = loops_per_jiffy;
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int cpu = smp_processor_id();
- int i;
- atomic_set(&cpus_booted, 1);
- smp_store_cpu_info(cpu);
-
- for (i = 0; i < __smp_probe_cpus(); i++)
- cpu_set(i, cpu_possible_map);
+ init_new_context(current, &init_mm);
+ current_thread_info()->cpu = cpu;
+ plat_prepare_cpus(max_cpus);
+
+#ifndef CONFIG_HOTPLUG_CPU
+ cpu_present_map = cpu_possible_map;
+#endif
}
void __devinit smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
+ __cpu_number_map[0] = cpu;
+ __cpu_logical_map[0] = cpu;
+
cpu_set(cpu, cpu_online_map);
cpu_set(cpu, cpu_possible_map);
}
-int __cpu_up(unsigned int cpu)
+asmlinkage void __cpuinit start_secondary(void)
{
- struct task_struct *tsk;
+ unsigned int cpu;
+ struct mm_struct *mm = &init_mm;
- tsk = fork_idle(cpu);
+ atomic_inc(&mm->mm_count);
+ atomic_inc(&mm->mm_users);
+ current->active_mm = mm;
+ BUG_ON(current->mm);
+ enter_lazy_tlb(mm, current);
+
+ per_cpu_trap_init();
- if (IS_ERR(tsk))
- panic("Failed forking idle task for cpu %d\n", cpu);
-
- task_thread_info(tsk)->cpu = cpu;
+ preempt_disable();
+
+ local_irq_enable();
+
+ calibrate_delay();
+
+ cpu = smp_processor_id();
+ smp_store_cpu_info(cpu);
cpu_set(cpu, cpu_online_map);
- return 0;
+ cpu_idle();
}
-int start_secondary(void *unused)
+extern struct {
+ unsigned long sp;
+ unsigned long bss_start;
+ unsigned long bss_end;
+ void *start_kernel_fn;
+ void *cpu_init_fn;
+ void *thread_info;
+} stack_start;
+
+int __cpuinit __cpu_up(unsigned int cpu)
{
- unsigned int cpu;
+ struct task_struct *tsk;
+ unsigned long timeout;
- cpu = smp_processor_id();
+ tsk = fork_idle(cpu);
+ if (IS_ERR(tsk)) {
+ printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
+ return PTR_ERR(tsk);
+ }
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
+ /* Fill in data in head.S for secondary cpus */
+ stack_start.sp = tsk->thread.sp;
+ stack_start.thread_info = tsk->stack;
+ stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
+ stack_start.start_kernel_fn = start_secondary;
- smp_store_cpu_info(cpu);
+ flush_cache_all();
- __smp_slave_init(cpu);
- preempt_disable();
- per_cpu_trap_init();
-
- atomic_inc(&cpus_booted);
+ plat_start_cpu(cpu, (unsigned long)_stext);
- cpu_idle();
- return 0;
+ timeout = jiffies + HZ;
+ while (time_before(jiffies, timeout)) {
+ if (cpu_online(cpu))
+ break;
+
+ udelay(10);
+ }
+
+ if (cpu_online(cpu))
+ return 0;
+
+ return -ENOENT;
}
void __init smp_cpus_done(unsigned int max_cpus)
{
- smp_mb();
+ unsigned long bogosum = 0;
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ bogosum += 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 smp_send_reschedule(int cpu)
{
- __smp_send_ipi(cpu, SMP_MSG_RESCHEDULE);
+ plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
}
static void stop_this_cpu(void *unused)
smp_call_function(stop_this_cpu, 0, 1, 0);
}
-
struct smp_fn_call_struct smp_fn_call = {
.lock = SPIN_LOCK_UNLOCKED,
.finished = ATOMIC_INIT(0),
unsigned int nr_cpus = atomic_read(&cpus_booted);
int i;
- if (nr_cpus < 2)
- return 0;
-
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
for (i = 0; i < nr_cpus; i++)
if (i != smp_processor_id())
- __smp_call_function(i);
+ plat_send_ipi(i, SMP_MSG_FUNCTION);
if (wait)
while (atomic_read(&smp_fn_call.finished) != (nr_cpus - 1));
-/*
- * include/asm-sh/smp.h
- *
- * Copyright (C) 2002, 2003 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive for
- * more details.
- */
#ifndef __ASM_SH_SMP_H
#define __ASM_SH_SMP_H
#include <asm/current.h>
#define raw_smp_processor_id() (current_thread_info()->cpu)
+#define hard_smp_processor_id() plat_smp_processor_id()
+
+/* Map from cpu id to sequential logical cpu number. */
+extern int __cpu_number_map[NR_CPUS];
+#define cpu_number_map(cpu) __cpu_number_map[cpu]
+
+/* The reverse map from sequential logical cpu number to cpu id. */
+extern int __cpu_logical_map[NR_CPUS];
+#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
/* I've no idea what the real meaning of this is */
#define PROC_CHANGE_PENALTY 20
extern struct smp_fn_call_struct smp_fn_call;
-#define SMP_MSG_RESCHEDULE 0x0001
+#define SMP_MSG_FUNCTION 0
+#define SMP_MSG_RESCHEDULE 1
+#define SMP_MSG_NR 2
-#endif /* CONFIG_SMP */
+void plat_smp_setup(void);
+void plat_prepare_cpus(unsigned int max_cpus);
+int plat_smp_processor_id(void);
+void plat_start_cpu(unsigned int cpu, unsigned long entry_point);
+void plat_send_ipi(unsigned int cpu, unsigned int message);
+int plat_register_ipi_handler(unsigned int message,
+ void (*handler)(void *), void *arg);
+
+#else
#define hard_smp_processor_id() (0)
+#endif /* CONFIG_SMP */
+
#endif /* __ASM_SH_SMP_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff