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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