linux-kernel - Re: [PATCH] PCI: Clear bridge MEM_64 flag if one child does not support it

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Message-ID: <CAE9FiQWz=vdR=QSkoEs5XjUxg_y4vJgnChQAc1-U_9xzfQpknQ@mail.gmail.com>
Date:	Mon, 8 Dec 2014 23:20:59 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	Marek Kordík <kordikmarek@...il.com>,
	Alexey Voronkov <zermond@...il.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Clear bridge MEM_64 flag if one child does not
 support it

On Mon, Dec 8, 2014 at 6:26 PM, Wei Yang <weiyang@...ux.vnet.ibm.com> wrote:
> On Tue, Dec 09, 2014 at 11:11:19AM +1100, Gavin Shan wrote:
>>
>>I'm going to give it a spin and Richard, could you please apply Yinghai's
>>patch to see if your SRIOV code can work properly?
>>
>
> I did a quick test on my machine. This patch doesn't affect the MMIO
> allocation on out platform, so SRIOV works fine.
>
> I will spend more time to read the patch to get more understanding about the
> problem.

Hi Marek,

Can you boot following branch with "debug ignore_loglevel pci=realloc"
on your setup?

git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
for-pci-allocate-fit-3.18

it has
8f74af9: PCI, x86: Allocate mmio near end of free range
1ff91c1: PCI: Don't allocate small resource in big free space.
108b43b: resources: Add allocate_resource_fit()
b6a22f0: resources: Make find_resource could return just fit resource
cf50e16: resources: Split out __allocate_resource()

on top the v3.18, and it will allocate resource in fit way.

Thanks

Yinghai
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