linux-kernel - Re: Ask help about pre_init_apic

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Message-ID: <20140911085303.GN13406@lahna.fi.intel.com>
Date:	Thu, 11 Sep 2014 11:53:03 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: Ask help about pre_init_apic_IRQ0()

On Thu, Sep 11, 2014 at 04:44:54PM +0800, Jiang Liu wrote:
> 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?

Andy (Cc'd) has some MID boards that he uses almost daily basis. Andy
can you help Jiang here?

> 
> /* 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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