linux-kernel - Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

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Date:	Sat, 23 Aug 2008 10:51:29 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"David Witbrodt" <dawitbro@...global.net>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Vivek Goyal" <vgoyal@...hat.com>,
	"Bill Fink" <billfink@...dspring.com>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, netdev <netdev@...r.kernel.org>
Subject: Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

On Sat, Aug 23, 2008 at 4:58 AM, David Witbrodt <dawitbro@...global.net> wrote:
>
>
>> please send out after booting with hpet=disable
>> lspci -tv
>> lspci -vvxxx
>
> Info attached:

00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 13)
	Subsystem: Elitegroup Computer Systems Device 2621
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Region 0: I/O ports at fa00 [size=16]
	Region 1: Memory at 80000000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [b0] HyperTransport: MSI Mapping Enable- Fixed+
	Kernel driver in use: piix4_smbus
00: 02 10 85 43 03 04 30 02 13 00 05 0c 00 00 80 00
10: 01 fa 00 00 00 00 00 80 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 19 10 21 26
30: 00 00 00 00 b0 00 00 00 00 00 00 00 00 00 00 00
40: d4 3b 00 05 00 00 00 00 0f ff 00 00 00 00 00 00
50: f0 01 f0 0e f0 0f f0 07 11 0b f0 0f 00 00 00 00
60: 01 00 24 00 bf fd de 8f 3f 90 00 00 20 00 00 00
70: 00 01 00 00 08 00 c0 fe ff 6e 00 00 00 00 f0 0f
80: f0 0a f0 0f 00 00 00 00 00 00 00 00 8c 00 00 80
90: 01 fa 00 00 fa de ff 00 00 00 00 00 00 00 00 00
a0: 00 00 ff ff ff ff f0 08 ff fd 12 02 16 7b 20 00
b0: 08 00 02 a8 00 00 00 00 00 00 00 00 f0 0f 08 1a
c0: ff ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: d8 0c 00 00 00 00 44 00 00 00 00 00 aa 00 10 01

it seems kernel update BAR1 from 0xfed00000 to 0x80000000 after it can
not give 0xfed00000 to that device.

please try attached patch, and send out lspci -vvxxxx again.

YH

View attachment "hpet_in_bar1.patch" of type "text/x-patch" (1359 bytes)