linux-kernel - Re: [PATCH] of: treat PCI config space as IORESOURCE

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Date:	Thu, 29 May 2014 16:50:24 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Kumar Gala <galak@...eaurora.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Liviu Dudau <liviu@...au.co.uk>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH] of: treat PCI config space as IORESOURCE_MEM type

Adding Jason Gunthorpe...

On Thu, May 29, 2014 at 3:51 PM, Kumar Gala <galak@...eaurora.org> wrote:
>
> On May 29, 2014, at 3:44 PM, Rob Herring <robherring2@...il.com> wrote:
>
>> On Thu, May 29, 2014 at 11:03 AM, Kumar Gala <galak@...eaurora.org> wrote:
>>> If we have a PCI config space specified in something like a ranges
>>> property we should treat it as memory type resource.
>>
>> Config space should not be in ranges[1]. We have some cases that are,
>> but we don't want new ones.
>
> For the cases we have I agree, however an ECAM based cfg seems completely legit.

The previous discussion concluded otherwise. Debate it with Jason. I
don't really have an opinion other than it be done one way.

Rob

>>> Signed-off-by: Kumar Gala <galak@...eaurora.org>
>>> ---
>>> drivers/of/address.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/of/address.c b/drivers/of/address.c
>>> index cb4242a..4e7ee59 100644
>>> --- a/drivers/of/address.c
>>> +++ b/drivers/of/address.c
>>> @@ -122,6 +122,9 @@ static unsigned int of_bus_pci_get_flags(const __be32 *addr)
>>>        u32 w = be32_to_cpup(addr);
>>>
>>>        switch((w >> 24) & 0x03) {
>>> +       case 0x00: /* cfg space */
>>> +               flags |= IORESOURCE_MEM;
>>> +               break;
>>
>> How would you then distinguish actual memory ranges?
>
> One assumes you are still looking at pci_space as part of of_pci_range
>
>>
>> Rob
>>
>> [1] http://www.spinics.net/lists/linux-pci/msg30585.html
>> --
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>
> --
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
>
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