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Date: Thu, 24 Oct 2002 15:03:31 -0500
From: Corey Minyard <cminyard@mvista.com>
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To: John Levon <levon@movementarian.org>
CC: dipankar@gamebox.net, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] NMI request/release, version 5 - I think this one's ready
References: <20021022190818.GA84745@compsoc.man.ac.uk> <3DB5C4F3.5030102@mvista.com> <20021023230327.A27020@dikhow> <3DB6E45F.5010402@mvista.com> <20021024002741.A27739@dikhow> <3DB7033C.1090807@mvista.com> <20021024132004.A29039@dikhow> <3DB7F574.9030607@mvista.com> <20021024144632.GC32181@compsoc.man.ac.uk> <3DB81376.90403@mvista.com> <20021024171815.GA6920@compsoc.man.ac.uk>
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John Levon wrote:

>On Thu, Oct 24, 2002 at 10:36:22AM -0500, Corey Minyard wrote:
>
>  
>
>>Is there any way to detect if the nmi watchdog actually caused the 
>>timeout?  I don't understand the hardware well enough to do it without 
>>    
>>
>
>You can check if the counter used overflowed :
>
>#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
>#define CTRL_READ(l,h,msrs,c) do {rdmsr(MSR_P6_PERFCTR0, (l), (h));} while (0)
>
>                CTR_READ(low, high, msrs, i);
>                if (CTR_OVERFLOWED(low)) {
>			... found
>
Any way to do this for the IO_APIC case?

-Corey


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