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: 9+ 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 18:49 ` Jeff Garzik [this message]
2006-11-16 8:45 ` Vasily Averin
2006-11-17 12:54 ` [Q] workaround for " Vasily Averin
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