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x86_64: smp: initialise APs in parallel

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bring_all_ap_online() now initialises all APs in parallel, and waits
for them all to come online (i.e. reach the end of ap_trampoline_exit,
making them ready to start scheduling threads) before returning.
This commit is contained in:
max 🍓
2023-05-05 15:25:55 +01:00
parent cec6b644ac
commit 76919abb10
1 changed files with 10 additions and 3 deletions
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13
arch/x86_64/acpi/smp.cpp
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@@ -17,6 +17,9 @@ volatile uint8_t __all_ap_ok = 0;
extern "C" void ap_trampoline_exit(void)
{
struct vm_page *stack_page = (struct vm_page *)__ap_stack_page;
__this_ap_ok = 1;
ml_cpu_block *this_cpu = (ml_cpu_block *)kmalloc(sizeof *this_cpu, VM_NORMAL);
ml_cpu_block_init(this_cpu);
ml_cpu_block_use(this_cpu);
@@ -31,7 +34,7 @@ extern "C" void ap_trampoline_exit(void)
struct thread *this_thread = create_idle_thread();
this_thread->tr_id = cpu_id;
this_thread->tr_kstack = (struct vm_page *)__ap_stack_page;
this_thread->tr_kstack = (struct vm_page *)stack_page;
self->c_rq.rq_idle = self->c_rq.rq_cur = this_thread;
put_cpu(self);
@@ -39,7 +42,6 @@ extern "C" void ap_trampoline_exit(void)
ap_apic_init();
cpu_set_online(cpu_id);
__this_ap_ok = 1;
irq_enable();
idle();
@@ -113,7 +115,12 @@ kern_status_t bring_all_ap_online(void)
p += rec->r_length;
}
printk("acpi: found %u logical cores", nr_processors);
while (cpu_nr_available() != cpu_nr_online()) {
ml_cpu_relax();
}
printk("acpi: %u APs online", cpu_nr_online());
return KERN_OK;
}