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

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Message-Id: <47B1E3D0-4336-4529-80B0-172F4ACA5C97@codeaurora.org>
Date:	Thu, 29 May 2014 15:51:28 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Rob Herring <robherring2@...il.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


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.

>> 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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