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

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Date:	Fri, 10 Apr 2015 09:31:42 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.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, 2015-04-09 at 11:31 -0700, Yinghai Lu wrote:
> 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,

Do you need to pass bus if you have dev ?

Do we have any caller that doesn't have dev available ?

Cheers,
Ben.

> ?
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