linux-kernel - Re: [PATCH v4 3/5] PCI: Handle IORESOURCE_PCI_FIXED when sizing and assigning resources.

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Message-ID: <CAE9FiQVr9E4w80ZSeTgKKwbGQ=NQiReSRnfoGF3D3+3NXj-G3Q@mail.gmail.com>
Date:	Fri, 2 Oct 2015 20:00:20 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	David Daney <ddaney.cavm@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rafał Miłecki <zajec5@...il.com>,
	linux-api@...r.kernel.org,
	"Sean O. Stalley" <sean.stalley@...el.com>,
	Rajat Jain <rajatxjain@...il.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v4 3/5] PCI: Handle IORESOURCE_PCI_FIXED when sizing and
 assigning resources.

On Fri, Oct 2, 2015 at 4:38 PM, David Daney <ddaney@...iumnetworks.com> wrote:
> On 10/02/2015 04:14 PM, Yinghai Lu wrote:
>>
>> https://patchwork.kernel.org/patch/7304371/
>> [v6,06/53] PCI: Claim fixed resource during remove/rescan path
>
>
> This one is interesting, but I don't think it will work.
>
> pci_claim_resource() calls pci_find_parent_resource(), which will fail in
> important use cases.
>
> It is perfectly legal for a bridge provisioned by EA to not specify any
> resources.  In this case we must walk up the bus tree until we find
> something that contains the device resource, and can thus be a parent.
>
> That is a big part of what my patch is doing.

looks we need another resource flags for EA in addition to
FIXED as it could out side of bridge MMIO range.

>
> As for the merits of assigning fixed resources from the FINAL fixup, rather
> than in __pci_bus_assign_resources(), I am unsure.

usually __pci_bus_assign_resources() is used for unassigned one. so
I don't want it mixed with request resource there.

Thanks

Yinghai
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