From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: akpm@osdl.org, linux-ide@vger.kernel.org
Subject: Re: [PATCH] libata: Add a drivers/ide style DMA disable
Date: Tue, 02 Oct 2007 12:38:48 -0400 [thread overview]
Message-ID: <47027418.1080008@garzik.org> (raw)
In-Reply-To: <20070822233710.415faaf0@the-village.bc.nu>
Alan Cox wrote:
> This is useful when debugging, handling problem systems, or for
> distributions just to get the system installed so it can be sorted
> out later.
>
> This is a bit smarter than the old IDE one and lets you do
>
> libata.pata_dma=0 Disable all PATA DMA like old IDE
> libata.pata_dma=1 Disk DMA only
> libata.pata_dma=2 ATAPI DMA only
> libata.pata_dma=4 CF DMA only
>
> (or combinations thereof - 0,1,3 being the useful ones I suspect)
>
> (I've split CF as it seems to be a seperate case of pain and suffering
> different to the others and caused by assorted PIO wired adapters etc)
>
> SATA is not affected - for one its not clear it makes sense to disable
> DMA for SATA if even always possible, for two we've seen no failure
> evidence to justify needing to support this kind of hammer on SATA.
>
> Signed-off-by: Alan Cox <alan@redhat.com>
applied, after making it work on SATA too
prev parent reply other threads:[~2007-10-02 16:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-22 22:37 [PATCH] libata: Add a drivers/ide style DMA disable Alan Cox
2007-09-07 3:58 ` Tejun Heo
2007-09-07 22:47 ` Jeff Garzik
2007-09-08 6:01 ` Tejun Heo
2007-09-08 18:42 ` Alan Cox
2007-09-14 17:17 ` Chuck Ebbert
2007-09-14 19:54 ` Bartlomiej Zolnierkiewicz
2007-09-19 15:53 ` Chuck Ebbert
2007-09-19 16:40 ` Alan Cox
2007-09-20 1:18 ` Tejun Heo
2007-10-02 16:38 ` Jeff Garzik [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47027418.1080008@garzik.org \
--to=jeff@garzik.org \
--cc=akpm@osdl.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-ide@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).