linux-kernel - Re: Ask help about pre_init_apic

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Message-ID: <20140911231714.GA24885@psi-dev26.jf.intel.com>
Date:	Thu, 11 Sep 2014 16:17:14 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Ask help about pre_init_apic_IRQ0()

On Thu, Sep 11, 2014 at 12:08:56PM +0300, Andy Shevchenko wrote:
> On Thu, 2014-09-11 at 11:53 +0300, Mika Westerberg wrote:
> > 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?
> 
> I'm not familiar with IRQ domains like people Cc'ed here, but I could
> test any patch you provide to me. Just keep me in Cc list of those
> patches you would like to be tested on Intel MID, though I have only
> Intel Medfield based board. For newer stuff would be better to ask David
> (Cc'ed).

I am able to test on newer devices.
Feel free to CC me when sending the patches.

Br, David

> 
> > 
> > > 
> > > /* 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
> 
> 
> -- 
> Andy Shevchenko <andriy.shevchenko@...el.com>
> Intel Finland Oy
> 
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