linux-kernel - Re: Bad CD disk disables IDE DMA

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Message-ID: <46C42DD6.5090200@dunaweb.hu>
Date:	Thu, 16 Aug 2007 12:58:30 +0200
From:	Zoltan Boszormenyi <zboszor@...aweb.hu>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: Bad CD disk disables IDE DMA

Michal Piotrowski írta:
> Hi Zoltan,
>
> On 15/08/07, Zoltan Boszormenyi <zboszor@...aweb.hu> wrote:
>   
>> Hi,
>>
>> I noticed that a bad CD of mine makes DMA disabled:
>>
>> hda: selected mode 0x44
>> hda: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error }
>> hda: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 }
>> ide: failed opcode was: unknown
>> hda: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error }
>> hda: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 }
>> ide: failed opcode was: unknown
>> hda: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error }
>> hda: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 }
>> ide: failed opcode was: unknown
>> hda: cdrom_decode_status: status=0x51 { DriveReady SeekComplete Error }
>> hda: cdrom_decode_status: error=0x40 { LastFailedSense=0x04 }
>> ide: failed opcode was: unknown
>> hda: DMA disabled
>> hda: ide_intr: huh? expected NULL handler on exit
>> hda: ATAPI reset complete
>>
>> Every time I put the said CD into to drive and DMA is on, I get the
>> above messages.
>>     
>
> This might be intended.
>   

Might be. Note however, that there are no "cdrom_decode_status: " lines
when the drive is not using DMA. The disk is the same in both cases.
I don't know too much about ATAPI, but shouldn't it report the same
errors no matter how the commands are passed to the drive?
I tried to make it using DMA after mounting the "faulty" disk and 
copying it.
The same errors occured in the logs when dd started reading but it actually
finished reading:

$ LANG=C dd if=/dev/hda of=image.iso bs=2048
dd: reading `/dev/hda': Input/output error
298106+0 records in
298106+0 records out
610521088 bytes (611 MB) copied, 144.349 seconds, 4.2 MB/s

The file is a bit larger than what isosize reports about it but IIRC 
it's expected.
So, if the disk is actually faulty dd would drop dead and not able to 
read the disk.
Or something is not quite right in the ide-cd driver. The "DMA disabled" 
message
comes when the drive should spin up the disk. Isn't there a timeout 
error somewhere?
Hm. Thinking about it a bit more upon mount the same is happening - before
the disk is spun up the error shows up in the logs and it switches to PIO.
Does it ring a bell to someone?

>> Two things are interesting: first, it gets mounted correctly and
>> readable and
>> second, when DMA was already disabled no such messages occur in the logs.
>> Anyhow, I would need DMA to correctly burn CDs/DVDs...
>> What can I do besides manually re-enable DMA?
>> All other disks I have tried behave perfectly.
>> This happened on 2.6.22[-rcX], 2.6.23-rc3-git1 and 2.6.20-1.2962.fc6.
>> This is on a Fedora Core 6 system. CD/DVD is using the old IDE drivers:
>>
>> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
>> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
>> NFORCE-MCP55: IDE controller at PCI slot 0000:00:04.0
>> NFORCE-MCP55: chipset revision 161
>> NFORCE-MCP55: not 100% native mode: will probe irqs later
>> NFORCE-MCP55: BIOS didn't set cable bits correctly. Enabling workaround.
>> NFORCE-MCP55: 0000:00:04.0 (rev a1) UDMA133 controller
>>     ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
>> Probing IDE interface ide0...
>> hda: PIONEER DVD-RW DVR-111L, ATAPI CD/DVD-ROM drive
>> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
>> Probing IDE interface ide1...
>> ide-floppy driver 0.99.newide
>>
>> $ cat /proc/ide/amd74xx
>> ----------AMD BusMastering IDE Configuration----------------
>> Driver Version:                     2.13
>> South Bridge:                       0000:00:04.0
>> Revision:                           IDE 0xa1
>> Highest DMA rate:                   UDMA133
>> BM-DMA base:                        0xf000
>> PCI clock:                          33.3MHz
>> -----------------------Primary IDE-------Secondary IDE------
>> Prefetch Buffer:              yes                 yes
>> Post Write Buffer:            yes                 yes
>> Enabled:                      yes                  no
>> Simplex only:                  no                 yes
>> Cable Type:                   80w                 80w
>> -------------------drive0----drive1----drive2----drive3-----
>> Transfer Mode:        PIO       DMA       DMA       DMA
>> Address Setup:       30ns      90ns      90ns      90ns
>> Cmd Active:          90ns      90ns     300ns     300ns
>> Cmd Recovery:        30ns      30ns     300ns     300ns
>> Data Active:         90ns     330ns     330ns     330ns
>> Data Recovery:       30ns     270ns     270ns     270ns
>> Cycle Time:         120ns     600ns     600ns     600ns
>> Transfer Rate:   16.6MB/s   3.3MB/s   3.3MB/s   3.3MB/s
>>
>> Best regards,
>> Zoltán Böszörményi
>>     
>
> Regards,
> Michal
>
>   

Best regards,
Zoltán


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