Message-Id: <201003271119.53757.bzolnier@gmail.com>
Date:	Sat, 27 Mar 2010 11:19:53 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	David Fries <david@...es.net>
Cc:	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: 2.6.34-rc2 breaks via82cxxx Host Protected Area

On Saturday 27 March 2010 03:09:35 am David Fries wrote:
> On Fri, Mar 26, 2010 at 08:42:26PM -0400, Jeff Garzik wrote:
> > On 03/26/2010 08:36 PM, David Fries wrote:
> >> On Fri, Mar 26, 2010 at 08:12:26PM -0400, Jeff Garzik wrote:
> >>> 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)
> 
> > All these errors related to unknown-block(22,2) are it trying to find  
> > /dev/hdX, when libata uses the SCSI block devices /dev/sdX
> >
> > These errors are unrelated to HPA, and are a standard issue encountered  
> > when moving from legacy IDE driver to libata.
> 
> added
> libata.dma=0 libata.ignore_hpa=1
> and it's showing the full disk again, thanks for pointing that out,
> I'm just not used to giving module parameters on the kernel command
> line.  Now I'll see what Bartlomiej Zolnierkiewicz has to say about
> his patch which broke via82cxxx.

Please bring upstream IDE problems with upstream kernel maintainer.

I have very little control over what people are doing with some (taken
out of much larger context) atang-specific patches posted for review
to kernel mailing lists and over quality of integration/testing work
that should always accompany upstream merge.

The commit itself may also have a problem but since it was _never_ in
linux-next tree it never saw a wider upstream testing.  Moreover upstream
doesn't use unified driver source (atang tree does) which makes makes
debugging and long-term maintenance more time consuming than necessary.

I'm sorry to hear about your problem but it is not my fault and I prefer
using my _private_ time in more constructive ways..

--
Bartlomiej Zolnierkiewicz
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