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

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Message-ID: <CAE9FiQWf1kRx2Dx7LzCy7WhDonO54Q3o+5Nu+uxxsCs1unBMtg@mail.gmail.com>
Date:	Thu, 9 Apr 2015 11:31:30 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	David Ahern <david.ahern@...cle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH 3/3] PCI: Set pref for mem64 resource of pcie device

On Thu, Apr 9, 2015 at 1:54 AM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> 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,

to

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

?
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