linux-kernel - Re: hpet_late

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Date:	Wed, 16 Jan 2008 07:51:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Balaji Rao <balajirrao@...il.com>
Subject: Re: hpet_late_init hang


(Balaji Cc:-ed)

* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> "
> commit e5ed385fa0d6f35406e3e3ed75e5eb9adeb811df
> Author: Balaji Rao <balajirrao@...il.com>
> Date:   Tue Jan 15 16:53:29 2008 +0100
> 
>     Assign IRQs to HPET Timers
> "
> in x86.git
> 
> cause my servers hang
> after
> Calling initcall 0xffffffff80b9a465: hpet_late_init+0x0/0x100()

i'm wondering, where does it hang exactly and why?

> after reverting that I got:
> 
> initcall 0xffffffff80b947d1 ran for 19 msecs: pci_iommu_init+0x0/0x13()
> Calling initcall 0xffffffff80b9a465: hpet_late_init+0x0/0x100()
> hpet0: at MMIO 0xfed00000, IRQs 2, 8, 31
> hpet0: 3 32-bit timers, 25000000 Hz
> initcall 0xffffffff80b9a465: hpet_late_init+0x0/0x100() returned 0.
> initcall 0xffffffff80b9a465 ran for 7 msecs: hpet_late_init+0x0/0x100()
> 
>            CPU0       CPU1       CPU2       CPU3       CPU4       CPU5
>       CPU6       CPU7
>   0:         86          0          0          0          0          0
>          1          0   IO-APIC-edge      timer
>   4:          0          0          0          0          0          0
>          1        838   IO-APIC-edge      serial
>   7:          1          0          0          0          0          0
>          0          0   IO-APIC-edge
>   8:          0          0          0          0          0          0
>          0          0   IO-APIC-edge      rtc0
> 
> for mcp55, it should already route hpet to ioapic pin2 or the irq0.

hm, these new bits:

+       /* Assign IRQs statically for legacy devices */
+       hpetp->hp_dev[0].hd_hdwirq = hdp->hd_irq[0];
+       hpetp->hp_dev[1].hd_hdwirq = hdp->hd_irq[1];

seem to be different from where we came from:

-       for (i = 2; i < nrtimers; timer++, i++)
-               hd.hd_irq[i] = (timer->hpet_config & Tn_INT_ROUTE_CNF_MASK) >>
-                       Tn_INT_ROUTE_CNF_SHIFT;

	Ingo
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