linux-kernel - Re: Supermicro X9SRL-F - channel enumeration error & ACPI/firmware bug question

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Date:	Sun, 2 Dec 2012 14:26:49 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Robert Hancock <hancockrwd@...il.com>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	support@...ermicro.com, linux-kernel@...r.kernel.org,
	Dan Williams <djbw@...com>, Jeff Garzik <jgarzik@...ox.com>,
	linux-ide@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>,
	iommu@...ts.linux-foundation.org
Subject: Re: Supermicro X9SRL-F - channel enumeration error & ACPI/firmware
 bug question

On Thu, Nov 29, 2012 at 08:38:53PM -0700, Bjorn Helgaas wrote:
> That's essentially the patch at
> https://bugzilla.redhat.com/show_bug.cgi?id=757166#c16, which in my
> opinion is too ugly to consider.  But fortunately, I'm not the
> maintainer for any IOMMU drivers.

There is a quirk infrastructure for those kinds of broken devices in
drivers/pci/quirks.c. Have a look into the function
pci_get_dma_source(). This function is used by the IOMMU drivers to
create the correct mappings.


	Joerg


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