From: Jeff Garzik <jeff@garzik.org>
To: Robert Hancock <hancockr@shaw.ca>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
ide <linux-ide@vger.kernel.org>, Tejun Heo <htejun@gmail.com>
Subject: Re: [PATCH] sata_nv: fix ATAPI issues with memory over 4GB (v7)
Date: Wed, 06 Feb 2008 07:04:14 -0500 [thread overview]
Message-ID: <47A9A23E.5060006@garzik.org> (raw)
In-Reply-To: <47A7BE36.1010902@shaw.ca>
Robert Hancock wrote:
> This fixes some problems with ATAPI devices on nForce4 controllers in ADMA mode
> on systems with memory located above 4GB. We need to delay setting the 64-bit
> DMA mask until the PRD table and padding buffer are allocated so that they don't
> get allocated above 4GB and break legacy mode (which is needed for ATAPI
> devices). Also, if either port is in ATAPI mode we need to set the DMA mask
> for the PCI device to 32-bit to ensure that the IOMMU code properly bounces
> requests above 4GB, as it appears setting the bounce limit does not guarantee
> that we will not try to map requests above this point.
>
> Reported to fix https://bugzilla.redhat.com/show_bug.cgi?id=351451
>
> Signed-off-by: Robert Hancock <hancockr@shaw.ca>
applied, though it can still be improved... let's see if this sticks.
prev parent reply other threads:[~2008-02-06 12:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-05 1:39 [PATCH] sata_nv: fix ATAPI issues with memory over 4GB (v7) Robert Hancock
2008-02-06 12:04 ` Jeff Garzik [this message]
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