linux-kernel - Re: [PATCH] sata_nv: fix ATAPI issues with memory over 4GB (v7)

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Message-ID: <47A9A23E.5060006@garzik.org>
Date:	Wed, 06 Feb 2008 07:04:14 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Robert Hancock <hancockr@...w.ca>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] sata_nv: fix ATAPI issues with memory over 4GB (v7)

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@...w.ca>

applied, though it can still be improved...  let's see if this sticks.


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