linux-kernel - Re: [RFC PATCH v5 7/8] PCI/PCIe: add "pci=nopciehp" to disable PCIe native hotplug

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Date:	Fri, 18 Jan 2013 23:08:07 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Jiang Liu <liuj97@...il.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>
Subject: Re: [RFC PATCH v5 7/8] PCI/PCIe: add "pci=nopciehp" to disable PCIe native hotplug

On Friday, January 18, 2013 09:50:59 AM Yinghai Lu wrote:
> On Fri, Jan 18, 2013 at 9:35 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> > If you want "pci=nopciehp" as a way for users to deal with this
> > problem by forcing the use of acpiphp, I object.  Windows manages to
> > make these slots work without having users do anything special, so we
> > should be able to do it, too.
> 
> Agreed.
> 
> We need to think that more.
> 
> I think that we should fix acpiphp, and should follow first come and
> first serve for acpiphp and pciehp.

That would introduce regressions for some users, though.

I actually think we should merge acpiphp with pciehp and make one driver that
can use both types of signalling.  There would be a problem with getting
notifications for the same event from both sources, but that doesn't seem to
be unsolvable.

And I don't think that that one combined driver should be modular.

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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