ATAPI DMA timeouts showing up in logs

ATAPI DMA timeouts showing up in logs

[Dennis Grant]

Now that I've got the proper IDE driver in place (2.4.20rc4) and the master drive
on the primary interface is running at a full ATA133, these have started showing
up in the logs - 2 or 3 a day:

hdc: timeout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hdc: status timeout: status=0xd0 { Busy }
hdc: drive not ready for command
hdc: ATAPI reset complete

Here's the dmesg output about this drive:

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

VP_IDE: IDE controller on PCI bus 00 dev 89
PCI: No IRQ known for interrupt pin A of device 00:11.1.
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1
    ide0: BM-DMA at 0xb800-0xb807, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xb808-0xb80f, BIOS settings: hdc:DMA, hdd:pio
hda: Maxtor 6E030L0, ATA DISK drive
hdc: 56X CD-ROM, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
blk: queue c034b164, I/O limit 4095Mb (mask 0xffffffff)
hda: 60058656 sectors (30750 MB) w/2048KiB Cache, CHS=3738/255/63, UDMA(133)

hdc: ATAPI 52X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12

And /sbin/hdparm -I /dev/hdc

/dev/hdc:

ATAPI CD-ROM, with removable media
        Model Number:       56X CD-ROM
        Serial Number:      MT1102A Firmware
        Firmware Revision:  VER 1.5F
Standards:
        Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
        Supported: CD-ROM ATAPI-2
Configuration:
        DRQ response: 50us.
        Packet size: 12 bytes
Capabilities:
        LBA, IORDY(cannot be disabled)
        DMA: *mdma0 mdma1 mdma2 *udma0 udma1 udma2 (?)
             Cycle time: min=120ns recommended=150ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=227ns  IORDY flow control=120ns

And /sbin/hdparm -i /dev/hdc

/dev/hdc:

 Model=56X CD-ROM, FwRev=VER 1.5F, SerialNo=MT1102A Firmware
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=yes, tPIO={min:227,w/IORDY:120}, tDMA={min:120,rec:150}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 *udma2
 AdvancedPM=no

And finally, 

/sbin/hdparm -v /dev/hdc

/dev/hdc:
 HDIO_GET_MULTCOUNT failed: Invalid argument
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  1 (on)
 readahead    =  8 (on)
 HDIO_GETGEO failed: Invalid argument

This last one is the only indication that something might be amiss - the two
instances of "invalid argument" Other than that, the drive appears to work just
fine.

What am I looking at?

DG

Re: ATAPI DMA timeouts showing up in logs

[Dennis Grant]

>On Thu, 1970-01-01 at 05:59, Dennis Grant wrote:

>> Now that I've got the proper IDE driver in place (2.4.20rc4)
>> and the master drive on the primary interface is running at
>> a full ATA133, these have started showing up in the logs - 
>> 2 or 3 a day:

> My guess is its the IDE command/DMA sequence bug that Khalid
> fixed in -ac. Some drives also take a very long time on 
> retrying blocks and that might cause a timeout/reset too.

OK.

Interestingly enough, the drive wasn't being used at all during the timeframe
when the messages show up - at least, not explictly. Perhaps some random process
was polling the drive....

Alan, I tried 2.4.20rc4-ac1 but while the patch took, it wouldn't compile. I'll
try again later and fwd where the error was. (I don't have access to that machine
at the moment)

>> This last one is the only indication that something might be >> amiss - the
two instances of "invalid argument" Other than
>> that, the drive appears to work just fine.

>Those are ones CD-ROM's dont support

Ah, OK. Perhaps hdparm shouldn't try them then. :)

Thanks.

DG

Re: ATAPI DMA timeouts showing up in logs

[Alan Cox]

On Thu, 1970-01-01 at 05:59, Dennis Grant wrote:
> Now that I've got the proper IDE driver in place (2.4.20rc4) and the master drive
> on the primary interface is running at a full ATA133, these have started showing
> up in the logs - 2 or 3 a day:

My guess is its the IDE command/DMA sequence bug that Khalid fixed in
-ac. Some drives also take a very long time on retrying blocks and that
might cause a timeout/reset too.

> This last one is the only indication that something might be amiss - the two
> instances of "invalid argument" Other than that, the drive appears to work just
> fine.

Those are ones CD-ROM's dont support

Re: IDE documentation bitrot, (Was: ATAPI DMA timeouts showing up in logs)

[Alan Cox]

> Is the current maintainer Mark Lord or Marcin Dalecki?  In the 2.5.x

Neither

> tree, it's had obsolete info removed, but it hasn't been brought up to
> date.

In theory its Andre & I - it does want updating badly

IDE documentation bitrot, (Was: ATAPI DMA timeouts showing up in logs)

[John Bradford]

>>> Now that I've got the proper IDE driver in place (2.4.20rc4)
>>> and the master drive on the primary interface is running at
>>> a full ATA133, these have started showing up in the logs - 
>>> 2 or 3 a day:
>> My guess is its the IDE command/DMA sequence bug that Khalid
>> fixed in -ac. Some drives also take a very long time on 
>> retrying blocks and that might cause a timeout/reset too.
> OK.

>>> This last one is the only indication that something might be amiss - the
>>> two instances of "invalid argument" Other than that, the drive
>>> appears to work just fine.
>> Those are ones CD-ROM's dont support
> Ah, OK. Perhaps hdparm shouldn't try them then. :)

There have been quite a few posts to linux-kernel about IDE diagnostic
messages that people are interpreting as fatal errors when they
aren't, and I've noticed that Documentation/ide.txt hasn't been
updated much for a long time - maybe it would be worth bringing it up
to date?

Is the current maintainer Mark Lord or Marcin Dalecki?  In the 2.5.x
tree, it's had obsolete info removed, but it hasn't been brought up to
date.

John.