Re: 2.6.34-rc2 breaks via82cxxx Host Protected Area

[Jeff Garzik]

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)
> > >
> > > 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@xxxxxxxxx>
> > > 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
>
> No, here is the output with ignore_hpa=1 on the command line.  I also
> don't see any difference with it not on the command line.

I said "module option", which is different from a kernel command line 
option.

If you are trying to build a module into the kernel image itself, you 
must use the "modulename.moduleoption" format on the kernel command 
line, ie. libata.ignore_hpa=1


> scsi0 : pata_via
> scsi1 : pata_via
> ata1: PATA max UDMA/33 cmd 0x1f0 ctl 0x3f6 bmdma 0xe400 irq 14
> ata2: PATA max UDMA/33 cmd 0x170 ctl 0x376 bmdma 0xe408 irq 15
> ata1.00: HPA detected: current 66055248, native 240121728
> ata1.00: ATA-7: Maxtor 6Y120P0, YAR41BW0, max UDMA/133
> ata1.00: 66055248 sectors, multi 16: LBA
> ata1.00: configured for UDMA/33
> scsi 0:0:0:0: Direct-Access     ATA      Maxtor 6Y120P0   YAR4 PQ: 0 ANSI: 5
> sd 0:0:0:0: [sda] 66055248 512-byte logical blocks: (33.8 GB/31.4 GiB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>   sda: sda1 sda2 sda3
> sda: p3 size 236037312 exceeds device capacity, limited to end of disk

This message should hopefully change, when the module option is 
correctly specified.


> sd 0:0:0:0: [sda] Attached SCSI disk
> ata2.01: ATAPI: PLEXTOR CD-R   PX-W4012A, 1.06, max UDMA/33
> ata2.01: configured for UDMA/33
> scsi 1:0:1:0: CD-ROM            PLEXTOR  CD-R   PX-W4012A 1.06 PQ: 0 ANSI: 5
> ...
> VFS: Cannot open root device "1602" or unknown-block(22,2)
> Please append a correct "root=" boot option; here are the available partitions:
> 0800        33027624 sda driver: sd
>    0801           49391 sda1
>    0802         1992816 sda2
>    0803        30985416 sda3
> 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.

	Jeff


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/