/*
*Complete the shutdown and place the processor offline.
*
* Called at splsched in the shutdown context.
*/
void
processor_offline(
processor_t processor)
{
thread_t new_thread, old_thread = processor->active_thread;
new_thread = processor->idle_thread;
processor->active_thread = new_thread;
processor->current_pri = IDLEPRI;
processor->current_thmode = TH_MODE_NONE;
processor->deadline = UINT64_MAX;
new_thread->last_processor = processor;
processor->last_dispatch = mach_absolute_time();
timer_stop(PROCESSOR_DATA(processor, thread_timer), processor->last_dispatch);
machine_set_current_thread(new_thread);
thread_dispatch(old_thread, new_thread);
PMAP_DEACTIVATE_KERNEL(processor->cpu_id);
cpu_sleep();
panic("zombie processor");
/*NOTREACHED*/
}
/*
* Called with interrupts disabled.
*/
void
processor_doshutdown(
processor_t processor)
{
thread_t old_thread, self = current_thread();
processor_t prev;
processor_set_t pset;
/*
* Get onto the processor to shutdown
*/
prev = thread_bind(processor);
thread_block(THREAD_CONTINUE_NULL);
assert(processor->state == PROCESSOR_SHUTDOWN);
#if CONFIG_DTRACE
if (dtrace_cpu_state_changed_hook)
(*dtrace_cpu_state_changed_hook)(processor->cpu_id, FALSE);
#endif
ml_cpu_down();
#if HIBERNATION
if (processor_avail_count < 2) {
hibernate_vm_lock();
hibernate_vm_unlock();
}
#endif
pset = processor->processor_set;
pset_lock(pset);
processor->state = PROCESSOR_OFF_LINE;
--pset->online_processor_count;
(void)hw_atomic_sub(&processor_avail_count, 1);
commpage_update_active_cpus();
SCHED(processor_queue_shutdown)(processor);
/* pset lock dropped */
/*
* Continue processor shutdown in shutdown context.
*
* We save the current context in machine_processor_shutdown in such a way
* that when this thread is next invoked it will return from here instead of
* from the machine_switch_context() in thread_invoke like a normal context switch.
*
* As such, 'old_thread' is neither the idle thread nor the current thread - it's whatever
* thread invoked back to this one. (Usually, it's another processor's idle thread.)
*
* TODO: Make this a real thread_run of the idle_thread, so we don't have to keep this in sync
* with thread_invoke.
*/
thread_bind(prev);
old_thread = machine_processor_shutdown(self, processor_offline, processor);
thread_dispatch(old_thread, self);
}
/*
* Called with interrupts disabled.
*/
void
processor_doshutdown(
processor_t processor)
{
thread_t old_thread, self = current_thread();
processor_t prev;
processor_set_t pset;
/*
* Get onto the processor to shutdown
*/
prev = thread_bind(processor);
thread_block(THREAD_CONTINUE_NULL);
assert(processor->state == PROCESSOR_SHUTDOWN);
#if CONFIG_DTRACE
if (dtrace_cpu_state_changed_hook)
(*dtrace_cpu_state_changed_hook)(processor->cpu_id, FALSE);
#endif
ml_cpu_down();
#if HIBERNATION
if (processor_avail_count < 2) {
hibernate_vm_lock();
hibernate_vm_unlock();
}
#endif
pset = processor->processor_set;
pset_lock(pset);
processor->state = PROCESSOR_OFF_LINE;
--pset->online_processor_count;
(void)hw_atomic_sub(&processor_avail_count, 1);
commpage_update_active_cpus();
SCHED(processor_queue_shutdown)(processor);
/* pset lock dropped */
/*
* Continue processor shutdown in shutdown context.
*/
thread_bind(prev);
old_thread = machine_processor_shutdown(self, processor_offline, processor);
thread_dispatch(old_thread, self);
}
/*
* Complete the shutdown and place the processor offline.
*
* Called at splsched in the shutdown context.
* This performs a minimal thread_invoke() to the idle thread,
* so it needs to be kept in sync with what thread_invoke() does.
*
* The onlining half of this is done in load_context().
*/
void
processor_offline(
processor_t processor)
{
assert(processor == current_processor());
assert(processor->active_thread == current_thread());
thread_t old_thread = processor->active_thread;
thread_t new_thread = processor->idle_thread;
processor->active_thread = new_thread;
processor->current_pri = IDLEPRI;
processor->current_thmode = TH_MODE_NONE;
processor->starting_pri = IDLEPRI;
processor->current_sfi_class = SFI_CLASS_KERNEL;
processor->deadline = UINT64_MAX;
new_thread->last_processor = processor;
uint64_t ctime = mach_absolute_time();
processor->last_dispatch = ctime;
old_thread->last_run_time = ctime;
/* Update processor->thread_timer and ->kernel_timer to point to the new thread */
thread_timer_event(ctime, &new_thread->system_timer);
PROCESSOR_DATA(processor, kernel_timer) = &new_thread->system_timer;
timer_stop(PROCESSOR_DATA(processor, current_state), ctime);
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_SCHED, MACH_SCHED) | DBG_FUNC_NONE,
old_thread->reason, (uintptr_t)thread_tid(new_thread),
old_thread->sched_pri, new_thread->sched_pri, 0);
machine_set_current_thread(new_thread);
thread_dispatch(old_thread, new_thread);
PMAP_DEACTIVATE_KERNEL(processor->cpu_id);
cpu_sleep();
panic("zombie processor");
/*NOTREACHED*/
}
