Re: [PATCH 3/3] PCI: Set pref for mem64 resource of pcie device

From: Yinghai Lu
Date: Thu Apr 09 2015 - 14:31:38 EST

On Thu, Apr 9, 2015 at 1:54 AM, Benjamin Herrenschmidt
<benh@xxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 2015-04-08 at 23:26 -0500, Bjorn Helgaas wrote:
>> I'm not planning to review this until after the merge window opens,
>> but I took a quick glance, and I agree with Ben. I don't want to add
>> a new IORESOURCE_ flag. I think a pci_resource_compatible() helper is
>> a great idea.
> So the new resource flag was handy here still regardless of the
> implementation choice because otherwise, we have to do the whole tree
> walk to check for "PCI Express only path".
> *But*, this is a property of the device as a whole, not of the resource,
> so we could instead have a pci_dev flag established at probe time that
> indicates that the path to a given device is PCIe only.

> That way, you avoid the special resource flag alltogether.

in the assign path: pci_bus_alloc_resource() does not take dev pointer.

should we make

int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,


int pci_bus_alloc_resource(struct pci_bus *bus, struct pci_dev *dev,
struct resource *res,

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