linux-kernel - Re: [PATCH V3 3/4] PCI: Add support for non-BAR ROMs

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Date:	Wed, 5 Sep 2012 13:46:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Don Dutile <ddutile@...hat.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-efi@...r.kernel.org,
	mfleming@...el.com, dwmw2@...radead.org, bhelgaas@...gle.com
Subject: Re: [PATCH V3 3/4] PCI: Add support for non-BAR ROMs

On Wed, 5 Sep 2012 03:29:32 +0100
Matthew Garrett <mjg@...hat.com> wrote:

> On Tue, Sep 04, 2012 at 10:18:48PM -0400, Don Dutile wrote:
> > >  	/*
> > >+	 * Some devices may provide ROMs via a source other than the BAR
> > >+	 */
> > >+	if (pdev->rom&&  pdev->romlen) {
> > >+		*size = pdev->romlen;
> > >+		return phys_to_virt((phys_addr_t)pdev->rom);
> >                        ^^^^^
> >                          ioremap_nocache() ? ... or is caching rom ok?
> 
> If it's appearing through this pathway then it's not actually in ROM, 
> the platform has pulled it out of somewhere else.

If that somewhere else is on the PCI bus then it should be a bus not a
virt translation surely ?
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