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Kernel: Add SMP IPI support

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We can now properly initialize all processors without
crashing by sending SMP IPI messages to synchronize memory
between processors.

We now initialize the APs once we have the scheduler running.
This is so that we can process IPI messages from the other
cores.

Also rework interrupt handling a bit so that it's more of a
1:1 mapping. We need to allocate non-sharable interrupts for
IPIs.

This also fixes the occasional hang/crash because all
CPUs now synchronize memory with each other.
This commit is contained in:
Tom 2020-07-06 07:27:22 -06:00 • committed by Andreas Kling
parent dec27e5e6f
commit bc107d0b33
27 changed files with 1236 additions and 627 deletions
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62
Kernel/Scheduler.cpp
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@ -566,57 +566,51 @@ void Scheduler::enter_current(Thread& prev_thread)
Process* Scheduler::colonel()
{
ASSERT(s_colonel_process);
return s_colonel_process;
}
void Scheduler::initialize(u32 cpu)
void Scheduler::initialize()
{
static Atomic<u32> s_bsp_is_initialized;
ASSERT(&Processor::current() != nullptr); // sanity check
Thread* idle_thread = nullptr;
if (cpu == 0) {
ASSERT(s_bsp_is_initialized.load(AK::MemoryOrder::memory_order_consume) == 0);
g_scheduler_data = new SchedulerData;
g_finalizer_wait_queue = new WaitQueue;
g_scheduler_data = new SchedulerData;
g_finalizer_wait_queue = new WaitQueue;
g_finalizer_has_work.store(false, AK::MemoryOrder::memory_order_release);
s_colonel_process = Process::create_kernel_process(idle_thread, "colonel", idle_loop, 1 << cpu);
ASSERT(s_colonel_process);
ASSERT(idle_thread);
idle_thread->set_priority(THREAD_PRIORITY_MIN);
idle_thread->set_name(String::format("idle thread #%u", cpu));
} else {
// We need to make sure the BSP initialized the global data first
if (s_bsp_is_initialized.load(AK::MemoryOrder::memory_order_consume) == 0) {
#ifdef SCHEDULER_DEBUG
dbg() << "Scheduler[" << cpu << "]: waiting for BSP to initialize...";
#endif
while (s_bsp_is_initialized.load(AK::MemoryOrder::memory_order_consume) == 0) {
}
#ifdef SCHEDULER_DEBUG
dbg() << "Scheduler[" << cpu << "]: initializing now";
#endif
}
g_finalizer_has_work.store(false, AK::MemoryOrder::memory_order_release);
s_colonel_process = Process::create_kernel_process(idle_thread, "colonel", idle_loop, 1);
ASSERT(s_colonel_process);
ASSERT(idle_thread);
idle_thread->set_priority(THREAD_PRIORITY_MIN);
idle_thread->set_name("idle thread #0");
ASSERT(s_colonel_process);
idle_thread = s_colonel_process->create_kernel_thread(idle_loop, THREAD_PRIORITY_MIN, String::format("idle thread #%u", cpu), 1 << cpu, false);
ASSERT(idle_thread);
}
set_idle_thread(idle_thread);
}
void Scheduler::set_idle_thread(Thread* idle_thread)
{
Processor::current().set_idle_thread(*idle_thread);
Processor::current().set_current_thread(*idle_thread);
}
if (cpu == 0)
s_bsp_is_initialized.store(1, AK::MemoryOrder::memory_order_release);
Thread* Scheduler::create_ap_idle_thread(u32 cpu)
{
ASSERT(cpu != 0);
// This function is called on the bsp, but creates an idle thread for another AP
ASSERT(Processor::current().id() == 0);
ASSERT(s_colonel_process);
Thread* idle_thread = s_colonel_process->create_kernel_thread(idle_loop, THREAD_PRIORITY_MIN, String::format("idle thread #%u", cpu), 1 << cpu, false);
ASSERT(idle_thread);
return idle_thread;
}
void Scheduler::timer_tick(const RegisterState& regs)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(Processor::current().in_irq());
if (Processor::current().id() > 0) return;
auto current_thread = Processor::current().current_thread();
if (!current_thread)
return;
@ -664,9 +658,11 @@ void Scheduler::idle_loop()
{
dbg() << "Scheduler[" << Processor::current().id() << "]: idle loop running";
ASSERT(are_interrupts_enabled());
for (;;) {
asm("hlt");
yield();
if (Processor::current().id() == 0) yield();
}
}