linux-kernel - Ask help about pre_init_apic

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Date:	Thu, 11 Sep 2014 16:44:54 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Ask help about pre_init_apic_IRQ0()

Hi Thomas,

When converting IOAPIC to hierarchy irqdomain, I ran into trouble when
dealing with pre_init_apic_IRQ0(). Currently pre_init_apic_IRQ0() is
only used by intel-mid platform and is called before initializing of
IOAPIC irqdomains. That really causes headache when converting to
hierarchy irqdomain. So could we delay
	io_apic_setup_irq_pin(0, 0, &attr);
        irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq,
                                      "edge");
to the point of "check_timer()"?

I have no MID hardware at handle so can't experiment with it. Could
you please refer someone for help?

/* Enable IOAPIC early just for system timer */
void __init pre_init_apic_IRQ0(void)
{
        struct io_apic_irq_attr attr = { 0, 0, 0, 0 };

        printk(KERN_INFO "Early APIC setup for system timer0\n");
#ifndef CONFIG_SMP
        physid_set_mask_of_physid(boot_cpu_physical_apicid,
                                         &phys_cpu_present_map);
#endif
        setup_local_APIC();

        io_apic_setup_irq_pin(0, 0, &attr);
        irq_set_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq,
                                      "edge");
}

Regards!
Gerry
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