linux-kernel - Re: 2.6.34-rc2 breaks via82cxxx Host Protected Area

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Message-ID: <4BAD4D6A.3010004@garzik.org>
Date:	Fri, 26 Mar 2010 20:12:26 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	David Fries <david@...es.net>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: 2.6.34-rc2 breaks via82cxxx Host Protected Area

On 03/26/2010 07:21 PM, David Fries wrote:
> The kernel fails to see the entire disk with 2.6.34-rc2 with VIA
> vt82c586b chipset.  I tracked it down to commit
> f931a5d5785d7b7c44871bd7ad2762e29dfddf29 "via82cxxx: workaround h/w
> bugs" and reverting just that one solves the problem, or just
> commenting out just one outb write in that change.
>
> via82cxxx 0000:00:07.1: VIA vt82c586b (rev 41) IDE UDMA33
> via82cxxx 0000:00:07.1: IDE controller (0x1106:0x0571 rev 0x06)
> via82cxxx 0000:00:07.1: not 100% native mode: will probe irqs later
>
> Note the kernel panic is intentional as I'm given the test kernel an
> invalid root device, so that I can suspend to disk, try a kernel,
> resume and pick up where I left off.  It does have a side benefit of
> dumping the size of all partitions.
>
> 2.6.34-rc2 unmodified, fails and sees 30985416 KiB for the last
> partition.
> ide-gd driver 1.18
> hda: max request size: 128KiB
> hda: 66055248 sectors (33820 MB) w/7936KiB Cache, CHS=65531/16/63
> hda: cache flushes supported
>   hda: hda1 hda2 hda3
> hda: p3 size 236037312 exceeds device capacity, enabling native capacity
> hda: p3 size 236037312 exceeds device capacity, limited to end of disk
> ide-cd driver 5.00
> ...
> Please append a correct "root=" boot option; here are the available partitions:
> 0300        33027624 hda driver: ide-gd
>    0301           49391 hda1
>    0302         1992816 hda2
>    0303        30985416 hda3
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(22,2)
>
> 2.6.34-rc2 with patch revered, correct size 118018656
> ide-gd driver 1.18
> hda: max request size: 128KiB
> hda: Host Protected Area detected.
>          current capacity is 66055248 sectors (33820 MB)
>          native  capacity is 240121728 sectors (122942 MB)
> hda: 66055248 sectors (33820 MB) w/7936KiB Cache, CHS=65531/16/63
> hda: cache flushes supported
>   hda: hda1 hda2 hda3
> hda: p3 size 236037312 exceeds device capacity, enabling native capacity
> hda: detected capacity change from 33820286976 to 122942324736
> ide-cd driver 5.00
> 0300       120060864 hda driver: ide-gd
>    0301           49391 hda1
>    0302         1992816 hda2
>    0303       118018656 hda3
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(22,2)
>
> Here are two debug patches, the first adds debug prints and the second
> disables the problematic write, I  have the output of both included.
>
>> From dac7d14ce1f227d8a084c3ec218ea1430bffdc57 Mon Sep 17 00:00:00 2001
> From: David Fries<david@...es.net>
> Date: Thu, 25 Mar 2010 19:51:31 -0500
> Subject: [PATCH 1/2] fails: add print messages
>
> add print messages for debugging
> ---
>   drivers/ide/via82cxxx.c |    5 +++++
>   1 files changed, 5 insertions(+), 0 deletions(-)

Does libata + pata_via work, if you pass ignore_hpa=1 module option to 
libata?

	Jeff




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