Message-ID: <20080224173451.GB11998@gollum.tnic>
Date:	Sun, 24 Feb 2008 18:34:51 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Brad Rosser <brad.rosser@...il.com>
Cc:	bzolnier@...il.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: IDE cdrom problem with PLEXTOR DVDR PX-608AL

On Sun, Feb 24, 2008 at 03:38:34PM +1000, Brad Rosser wrote:

[ Added Bart to CC: ]

Hi Brad,

> Borislav Petkov wrote:
> 
> > > Feb 14 00:18:18 kernel: hde: cdrom_pc_intr: The drive appears confused (ireason = 0x01).
> > > Trying to recover by ending request.
> > > Feb 14 00:27:27 kernel: hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x01).
> > > Trying to recover by ending request.
> > >
> > > ~> uname -a
> > > Linux xrated 2.6.24.1-35-pae #1 SMP 2008/02/12 01:00:18 UTC i686 athlon i386 GNU/Linux
> >
> > Actually the interrupt handler in ide-cd got rewritten and you're still using the
> > old one (cdrom_pc_intr vs cdrom_newpc_intr). Those changes went into mainline before
> > the 2.6.25-rc1 so we'll be able to test the new one only when you try out 2.6.25-rc1
> > or wait until 2.6.25 is released in case you don't want to try hazardous materials
> > such as an -rc kernel[*] :).
> 
> I have exactly the same problem.  I have a two-month old PC with a
> Gigabyte P35-DS4
> motherboard, which has the Intel P35 chipset with ICH10 south bridge and
> additional JMicron IDE/SATA controller.  I have two SATA-II hard disks
> and a sole
> IDE device, a Pioneer DVR-115D DVD-ROM, hooked up to the JMicron IDE port.
> The motherboard also has an embedded Realtek RTL8111/8168B gigabit
> ethernet controller.
> 
> The motherboard/bios assigns both the JMicron IDE controller and the Realtek
> controller to the same interrupt - typically '15'.  There's nothing in
> the bios that
> allows me to move one away from the other.  I can 'reserve' or block IRQs, but
> that only shifts them both to another interrupt.

well the driver probes the bios for that data and assigns the irq line it gets
from it.

> Similarly, no matter what I do with the Linux kernel, using boot parameters such
> as 'acpi=off', 'noapic', 'nolapic' and the like, I can never get the
> kernel to use
> different interrupts for these two controllers.  A 'cat
> /proc/interrupts' always shows
> them sharing their IRQ:
> 
>   # grep ide /proc/interrupts
>   17:   58077   4   98999   129160   IO-APIC-fasteoi   ide0, eth0
> 
> With the IDE driver compiled into the kernel any access to the DVD is fine
> until I start using the network.  Upon any network activity I get the 'confused'
> messages and more:
> 
> kernel: hda: cdrom_pc_intr: The drive appears confused (ireason =
> 0x01). Trying to recover by ending request.
> last message repeated 3 times
> kernel: ide: failed opcode was: unknown
> kernel: hda: drive not ready for command
> kernel: hda: status error: status=0x58 { DriveReady SeekComplete DataRequest }
> 
> KDE even kindly pops up a window telling me that someone has inserted a (ghost)
> DVD disc, would I care to play it?  :-(
> 
> I know nothing of modern/PCI hardware and their interrupt magic, but it seemed
> to me that the IDE driver was erroneously picking up the interrupts destined for
> the Realtek NIC and thinking they were for it.  Unfortunately there seemed to be
> no way for me to separate the two or get the IDE driver its own IRQ, either via
> the PC's bios or linux kernel boot parameters.
> 
> When I saw the recent message from Hans-Peter Jansen about this exact
> problem, and Boris's comment that something in interrupt land for the
> CD driver had been fixed, I thought the latest version of the kernel would
> rectify matters.  I installed the 2.6.25-rc2 kernel from kernel.org
> but the problem
> is still there.

Can you please send me your whole boot log of 2.6.25-rc2? Thanks.

> 
> As a workaround I've disabled IDE entirely in my kernel build and am using
> sr_mod to present the DVD as /dev/sr0.
> 
> As a result of all this I've got several novice questions relating to
> this matter.
> I don't know if this mailing list is an appropriate place to ask them
> .. my apologies
> if not.  Any quick references to reference material would be appreciated.
> 
> Given all the kernel parameters to change IRQ routing and turn ACPI actions
> up, down and sideways, is there any way to tell it to assign an explicit
> IRQ to a device?  Or have it that the IDE driver doesn't share?  I thought
> CONFIG_IDEPCI_SHARE_IRQ might have something to do with it, but fiddling
> the value for that had no effect.  It 'feels' to me that all these IRQs seem to
> be highly adjustable by the kernel, so I was hoping there'd be a way to
> let the IDE driver have one to itself.
> 
> Is there any way to leave the IDE driver compiled into the kernel but tell
> it to leave the DVD-ROM drive alone, so sr_mod can claim it rather than
> ide-cd?  I couldn't do it with my kernel, but I think Ubuntu (7.10) does
> manage it.  I tried various kernel boot parameters like 'hda=scsi' or
> 'hda=ide-scsi' but nothing seemed to work.  It would be nice to be able
> to use IDE hard disks while leaving the DVD-ROM to sr_mod until this
> problem is resolved.

since your cdrom seems to be hda from what i've seen above, try booting with
'hda=noprobe' or maybe 'hda=none' to see which one turns the probing off for
you. See Documentation/ide.txt for details.
> 
> Is there a primer/guide somewhere on how the modules all inter-relate
> in the kernel?  When IDE is compiled I see 'ide0' sharing IRQ17 with
> 'eth0' in /proc/interrupts.  When IDE is disabled it's replaced with
> 'libata' (which DOESN'T have any problems sharing).  I'm just curious
> as to why 'libata' isn't seen when IDE is taking front stage; does it
> sit underneath somehow?  Similarly I'm a bit fuzzy on how sr_mod
> sits on top of 'cdrom' while 'ide-cd' uses both 'cdrom' and ide-core.
> I'm just curious on how they all work together.  Does the 'cdrom'
> module talk straight to the DVD-ROM hardware or does it go though
> libata?  I always thought it used IDE.

Roughly speaking, cdrom.c is the unified cdrom layer that delivers common
functionality to all the cdrom devices. ide-cd and others are the low-level
device drivers that offer drive-specific functionality only. In case you wanna
know more about it, see Documentation/cdrom/cdrom-standard.tex (might want to
convert it to something more readable) and read the section on stackable kernel
modules in Linux Device Drivers, 3 ed.
> 
> My apologies if this post is at too simple/high a level for the wizards
> present.  I thought the feedback on 2.6.25-rc2 might be useful.
> 
> Thanks,
> 
> 
> Brad

-- 
Regards/Gruß,
    Boris.
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