*
* SMP support for the SuperH processors.
*
- * Copyright (C) 2002 - 2008 Paul Mundt
+ * Copyright (C) 2002 - 2010 Paul Mundt
* Copyright (C) 2006 - 2007 Akio Idehara
*
* This file is subject to the terms and conditions of the GNU General Public
int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
-static inline void __init smp_store_cpu_info(unsigned int cpu)
+struct plat_smp_ops *mp_ops = NULL;
+
+/* State of each CPU */
+DEFINE_PER_CPU(int, cpu_state) = { 0 };
+
+void __cpuinit register_smp_ops(struct plat_smp_ops *ops)
+{
+ if (mp_ops)
+ printk(KERN_WARNING "Overriding previously set SMP ops\n");
+
+ mp_ops = ops;
+}
+
+static inline void __cpuinit smp_store_cpu_info(unsigned int cpu)
{
struct sh_cpuinfo *c = cpu_data + cpu;
init_new_context(current, &init_mm);
current_thread_info()->cpu = cpu;
- plat_prepare_cpus(max_cpus);
+ mp_ops->prepare_cpus(max_cpus);
#ifndef CONFIG_HOTPLUG_CPU
init_cpu_present(&cpu_possible_map);
#endif
}
-void __devinit smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
set_cpu_online(cpu, true);
set_cpu_possible(cpu, true);
+
+ per_cpu(cpu_state, cpu) = CPU_ONLINE;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void native_cpu_die(unsigned int cpu)
+{
+ unsigned int i;
+
+ for (i = 0; i < 10; i++) {
+ smp_rmb();
+ if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
+ if (system_state == SYSTEM_RUNNING)
+ pr_info("CPU %u is now offline\n", cpu);
+
+ return;
+ }
+
+ msleep(100);
+ }
+
+ pr_err("CPU %u didn't die...\n", cpu);
+}
+
+int native_cpu_disable(unsigned int cpu)
+{
+ return cpu == 0 ? -EPERM : 0;
+}
+
+void play_dead_common(void)
+{
+ idle_task_exit();
+ irq_ctx_exit(raw_smp_processor_id());
+ mb();
+
+ __get_cpu_var(cpu_state) = CPU_DEAD;
+ local_irq_disable();
+}
+
+void native_play_dead(void)
+{
+ play_dead_common();
}
+int __cpu_disable(void)
+{
+ unsigned int cpu = smp_processor_id();
+ struct task_struct *p;
+ int ret;
+
+ ret = mp_ops->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.
+ */
+ set_cpu_online(cpu, false);
+
+ /*
+ * 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)
+ cpumask_clear_cpu(cpu, mm_cpumask(p->mm));
+ read_unlock(&tasklist_lock);
+
+ return 0;
+}
+#else /* ... !CONFIG_HOTPLUG_CPU */
+int native_cpu_disable(unsigned int cpu)
+{
+ return -ENOSYS;
+}
+
+void native_cpu_die(unsigned int cpu)
+{
+ /* We said "no" in __cpu_disable */
+ BUG();
+}
+
+void native_play_dead(void)
+{
+ BUG();
+}
+#endif
+
asmlinkage void __cpuinit start_secondary(void)
{
- unsigned int cpu;
+ unsigned int cpu = smp_processor_id();
struct mm_struct *mm = &init_mm;
enable_mmu();
atomic_inc(&mm->mm_count);
atomic_inc(&mm->mm_users);
current->active_mm = mm;
- BUG_ON(current->mm);
enter_lazy_tlb(mm, current);
+ local_flush_tlb_all();
per_cpu_trap_init();
preempt_disable();
- notify_cpu_starting(smp_processor_id());
+ notify_cpu_starting(cpu);
local_irq_enable();
- cpu = smp_processor_id();
-
/* Enable local timers */
local_timer_setup(cpu);
calibrate_delay();
smp_store_cpu_info(cpu);
- cpu_set(cpu, cpu_online_map);
+ set_cpu_online(cpu, true);
+ per_cpu(cpu_state, cpu) = CPU_ONLINE;
cpu_idle();
}
struct task_struct *tsk;
unsigned long timeout;
- tsk = fork_idle(cpu);
- if (IS_ERR(tsk)) {
- printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
- return PTR_ERR(tsk);
+ tsk = cpu_data[cpu].idle;
+ if (!tsk) {
+ tsk = fork_idle(cpu);
+ if (IS_ERR(tsk)) {
+ pr_err("Failed forking idle task for cpu %d\n", cpu);
+ return PTR_ERR(tsk);
+ }
+
+ cpu_data[cpu].idle = tsk;
}
+ per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
+
/* Fill in data in head.S for secondary cpus */
stack_start.sp = tsk->thread.sp;
stack_start.thread_info = tsk->stack;
(unsigned long)&stack_start + sizeof(stack_start));
wmb();
- plat_start_cpu(cpu, (unsigned long)_stext);
+ mp_ops->start_cpu(cpu, (unsigned long)_stext);
timeout = jiffies + HZ;
while (time_before(jiffies, timeout)) {
break;
udelay(10);
+ barrier();
}
if (cpu_online(cpu))
void smp_send_reschedule(int cpu)
{
- plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
+ mp_ops->send_ipi(cpu, SMP_MSG_RESCHEDULE);
}
void smp_send_stop(void)
int cpu;
for_each_cpu(cpu, mask)
- plat_send_ipi(cpu, SMP_MSG_FUNCTION);
+ mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION);
}
void arch_send_call_function_single_ipi(int cpu)
{
- plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
+ mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
}
void smp_timer_broadcast(const struct cpumask *mask)
int cpu;
for_each_cpu(cpu, mask)
- plat_send_ipi(cpu, SMP_MSG_TIMER);
+ mp_ops->send_ipi(cpu, SMP_MSG_TIMER);
}
static void ipi_timer(void)
* behalf of debugees, kswapd stealing pages from another process etc).
* Kanoj 07/00.
*/
-
void flush_tlb_mm(struct mm_struct *mm)
{
preempt_disable();
git.openpandora.org / pandora-kernel.git / blobdiff