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Re: 2.6.24-rc8 hangs at mfgpt-timer

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From: Jordan Crouse <jordan.crouse@...>
To: Arnd Hannemann <hannemann@...>
Cc: Lars Heete <hel@...>, Andres Salomon <dilinger@...>, Linux Kernel Mailing List <linux-kernel@...>
Subject: Re: 2.6.24-rc8 hangs at mfgpt-timer
Date: Tuesday, January 22, 2008 - 3:27 pm

> Indeed.

I have most excellent news.  I was able to get tinyBIOS booting on my
development platform.  I looked at the problem with the debugger and
I think I might have found something.  It looks like the interrupt is
firing immediately before the clock is enabled.  In the handler, we
were returning immediately if the clock wasn't enabled (and not clearing
the event), so we were caught in a classic interrupt storm.

The attached patch rearranges the code so that the handler is installed
before we setup the interrupt (so we have somebody to listen to the
immediate interrupt), and it makes sure that we clear the event in the IRQ
handler regardless of the state of the timer tick.

I'm not 100% sure why this happens on IRQ7 but not on 5 or 8, but it might
have something to do with the interrupts already being enabled on the other
vectors.  Anyway, please try this test patch and let me know what happens.

Jordan

-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.
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Messages in current thread:
2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Wed Jan 16, 1:44 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Andres Salomon, (Wed Jan 16, 5:19 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Andres Salomon, (Wed Jan 16, 5:56 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Thu Jan 17, 5:54 am)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Andres Salomon, (Thu Jan 17, 2:40 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Thu Jan 17, 3:53 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Thu Jan 17, 5:19 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Thu Jan 17, 5:50 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Thu Jan 17, 6:36 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Thu Jan 17, 6:52 pm)
[GEODE] Geode GX/LX watchdog timer (was 2.6.24-rc8 hangs at ..., Jordan Crouse, (Fri Jan 18, 9:06 pm)
Re: [GEODE] Geode GX/LX watchdog timer (was 2.6.24-rc8 hangs..., Lennart Sorensen, (Sun Jan 20, 4:16 pm)
Re: [GEODE] Geode GX/LX watchdog timer (was 2.6.24-rc8 hangs..., Arnd Hannemann, (Sun Jan 20, 9:22 am)
Re: Geode GX/LX watchdog timer (RESEND), Jordan Crouse, (Mon Jan 21, 1:07 pm)
Re: Geode GX/LX watchdog timer (RESEND), Arnd Hannemann, (Mon Jan 21, 2:37 pm)
Re: Geode GX/LX watchdog timer (RESEND), Iain Paton, (Sun Feb 17, 10:14 am)
Re: Geode GX/LX watchdog timer (RESEND), Arnd Hannemann, (Sun Feb 17, 10:46 am)
Re: Geode GX/LX watchdog timer (RESEND), Adrian Bunk, (Sun Feb 17, 10:54 am)
Re: Geode GX/LX watchdog timer (RESEND), Iain Paton, (Sun Feb 17, 12:10 pm)
Re: Geode GX/LX watchdog timer (RESEND), Arnd Hannemann, (Sun Feb 17, 3:46 pm)
Re: Geode GX/LX watchdog timer (RESEND), Andres Salomon, (Sun Feb 17, 1:32 pm)
Re: Geode GX/LX watchdog timer (was 2.6.24-rc8 hangs at mfgp..., Jordan Crouse, (Sun Jan 20, 12:34 pm)
Re: [GEODE] Geode GX/LX watchdog timer (was 2.6.24-rc8 hangs..., Willy Tarreau, (Sat Jan 19, 2:36 am)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Thu Jan 17, 6:57 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Thu Jan 17, 7:39 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Mon Jan 21, 7:27 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Tue Jan 22, 5:03 am)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Lars Heete, (Tue Jan 22, 6:11 am)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Tue Jan 22, 7:18 am)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Tue Jan 22, 3:27 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Arnd Hannemann, (Tue Jan 22, 4:54 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Ingo Molnar, (Tue Jan 22, 5:10 pm)
[PATCH 0/2] Was: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Wed Jan 23, 5:17 pm)
[PATCH 2/2] x86: GEODE add the "mfgptfix" boot time option t..., Willy Tarreau, (Wed Jan 23, 5:19 pm)
[PATCH 1/2] x86: GEODE fix MFGPT input clock value, Willy Tarreau, (Wed Jan 23, 5:18 pm)
Re: [PATCH 1/2] x86: GEODE fix MFGPT input clock value, H. Peter Anvin, (Wed Jan 23, 5:59 pm)
Re: [PATCH 1/2] x86: GEODE fix MFGPT input clock value, Willy Tarreau, (Wed Jan 23, 6:11 pm)
Re: x86: GEODE fix MFGPT input clock value, Jordan Crouse, (Wed Jan 23, 6:38 pm)
Re: x86: GEODE fix MFGPT input clock value, Arnd Hannemann, (Wed Jan 23, 7:17 pm)
Re: [PATCH 1/2] x86: GEODE fix MFGPT input clock value, H. Peter Anvin, (Wed Jan 23, 6:22 pm)
Re: [PATCH 1/2] x86: GEODE fix MFGPT input clock value, Willy Tarreau, (Wed Jan 23, 6:10 pm)
[git pull] was: Re: 2.6.24-rc8 hangs at mfgpt-timer, Thomas Gleixner, (Tue Jan 22, 5:53 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Tue Jan 22, 5:20 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Tue Jan 22, 2:15 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Mon Jan 21, 7:32 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Tue Jan 22, 4:15 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Tue Jan 22, 5:08 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Tue Jan 22, 5:15 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Wed Jan 23, 12:36 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Willy Tarreau, (Wed Jan 23, 12:10 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Jordan Crouse, (Thu Jan 17, 8:40 pm)
Re: 2.6.24-rc8 hangs at mfgpt-timer, Andres Salomon, (Thu Jan 17, 4:42 pm)