linux-kernel - Re: [PATCH 1/2] resources: set type of new resource returned by __request

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Message-ID: <CAErSpo582Ok9arr+3krKTQdue4i3wQOixVkBbheDX6a3v8xMHw@mail.gmail.com>
Date:	Mon, 21 May 2012 07:52:24 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Ingo Molnar <mingo@...e.hu>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH 1/2] resources: set type of new resource returned by __request_region()

On Mon, May 21, 2012 at 7:04 AM, Joerg Roedel <joro@...tes.org> wrote:
> On Fri, May 18, 2012 at 05:18:32PM -0600, Bjorn Helgaas wrote:
>> Previously we returned a new struct resource with only IORESOURCE_BUSY
>> set (and possibly IORESOURCE_MUXED or IORESOURCE_EXCLUSIVE), but no
>> MEM/IO/etc. bits set.  The new resource should inherit the type of
>> its parent.
>
> Should it? What about IORESOURCE_WINDOW for example? Any particular
> reason for this change to the interface of the __request_region()
> function?

Yes, I should have explained the connection :)  The next patch prints
the resource returned from request_mem_region().  Without this
__request_region() patch, that resource has no type, so %pR can't
print it correctly.

Good question about IORESOURCE_WINDOW.  Maybe it should inherit only
the IORESOURCE_TYPE_BITS part (IO/MEM/IRQ/DMA/BUS).  But it seemed
like it should also inherit PREFETCH, READONLY, CACHEABLE, etc.  Maybe
we should inherit everything but clear IORESOURCE_WINDOW?  I'm open to
suggestions here.

Bjorn
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