From: Jeff Garzik <jgarzik@pobox.com>
To: Tejun Heo <htejun@gmail.com>
Cc: Vasily Averin <vvs@sw.ru>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Jens Axboe <axboe@kernel.dk>,
linux-kernel@vger.kernel.org,
Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>,
linux-ide@vger.kernel.org, devel@openvz.org
Subject: Re: [Q] PCI Express and ide (native) leads to irq storm?
Date: Wed, 15 Nov 2006 13:49:21 -0500 [thread overview]
Message-ID: <455B6131.1@pobox.com> (raw)
In-Reply-To: <455AF01C.5090307@gmail.com>
Tejun Heo wrote:
> In short, some piix controllers including ICH7, when put into enhanced
> mode (PCI native mode), uses BMDMA Interrupt bit as interrupt
> pending/clear bit for *all* commands. ie. Reading STATUS does NOT clear
Yep. I thought I had mentioned this, ages ago.
> Fortunately, libata is immune to the problem because it does
> ap->ops->irq_clear(ap) in ata_host_intr() regardless of command type in
> flight. So, not loading IDE piix and using libata to drive all piix
> ports solves the problem.
Yep, that's intentional :)
Jeff
next prev parent reply other threads:[~2006-11-15 18:49 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-24 7:37 [Q] ide cdrom in native mode leads to irq storm? Vasily Averin
2006-10-24 7:53 ` Vasily Averin
2006-10-27 13:17 ` Vasily Averin
2006-10-27 14:21 ` Alan Cox
2006-11-14 9:08 ` [Q] PCI Express and ide (native) " Vasily Averin
2006-11-15 10:46 ` Tejun Heo
2006-11-15 10:46 ` Tejun Heo
2006-11-15 18:49 ` Jeff Garzik [this message]
2006-11-16 8:45 ` Vasily Averin
2006-11-17 12:54 ` [Q] workaround for " Vasily Averin
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=455B6131.1@pobox.com \
--to=jgarzik@pobox.com \
--cc=B.Zolnierkiewicz@elka.pw.edu.pl \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=axboe@kernel.dk \
--cc=devel@openvz.org \
--cc=htejun@gmail.com \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=vvs@sw.ru \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.