Re: [PATCH] IDE TCQ #4

Sebastian Droege
2002-04-18T12:19:34Z

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On Wed, 17 Apr 2002 12:42:39 +0200
Martin Dalecki <dalecki@evision-ventures.com> wrote:

> > 2.
> > when I cat /proc/ide/ide1/hdc/identify I get 2 unexpected interrupts
> > hdc and hdd are both cdrom drives (accessed via scsi-emulation if relevant)
> > but the problem shows up only with hdc
>
> Duh oh... This is actually a good hint. I will look after
> this.
>
> >
> > and maybe a third problem ;)
> > in /proc/ide/ide0/hda/tcq there is written:
> > DMA status: not running
>
> This is harmless it just shows that there was no DMA transfer in flight the
> time you have cat-ed this file.
>
> > but DMA is explicitly enabled by hdparm and shows up in /proc/ide/ide0/hda/settings
> >
> > I'll do some more testings later the day
Hi again,
after some playing with hdparm I found something bad :(

ide_tcq_intr_timeout: timeout waiting for interrupt
ide_tcq_intr_timeout: hwgroup not busy
hda: invalidating pending queue
ide_tcq_invalidate_queue: done

and then... nothing works anymore -> total lockup of the IDE system
This happens only (?) when I put hdparm -qa1 -qA1 -qc1 -qd1 -qm16 -qu1 -qW1 /dev/hda (the same with hdb) in my bootscripts
When I start hdparm later everything works fine first, but after a while (and when I'm under X) the IDE system is crashed

I have enabled following options:
CONFIG_BLK_DEV_IDE_TCQ=y
CONFIG_BLK_DEV_IDE_TCQ_FULL=y
CONFIG_BLK_DEV_IDE_TCQ_DEFAULT=y
CONFIG_BLK_DEV_IDE_TCQ_DEPTH=32

I hope this helps somehow but I don't know what further informations I can provide

BTW: I think we should create devfs entries for ide-scsi devices (because hdparm doesn't take scdX ;) )

Bye

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