linux-kernel - Re: [PATCH v2 23/37] PCI, ACPI: Add pci_root

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Message-ID: <CAE9FiQWvOpJ1N=QLQ3MHRqVGw7pz1Fuma60pJSwzqP5Jc5PF3Q@mail.gmail.com>
Date:	Mon, 12 Mar 2012 23:03:30 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 23/37] PCI, ACPI: Add pci_root_hp hot add hotplug notification

On Mon, Mar 12, 2012 at 8:22 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Sat, Mar 10, 2012 at 12:00 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>> It is from acpiphp_glue.c
>>
>> How to use it?
>> Find out root bus number to acpi root name mapping from dmesg or /sys
>>
>>  echo "\_SB.PCIB 0" > /proc/acpi/sci/notify
>> to add it back
>
> Nope.  That might be a way to exercise this for debug purposes (and it
> only works when /proc/acpi/sci/notify is compiled in), but we
> definitely don't want normal users to deal with ACPI pathnames like
> this.

before this patch set, only way is: Users really put one root bus in
and press buton etc to trigger notification
to get it work.

>
> Most of this functionality belongs in the ACPI core, not here.  The
> core should be handling these notify events and turning them into
> .add() and .remove() calls to the driver.
>
> But since the ACPI core doesn't do that yet, we have to do it in the
> driver, like we do for CPU, memory, etc.  That part is fine.  But I
> think it at least belongs *in* the driver, i.e., in pci_root.c, not in
> a new pci_root_hp.c file.

don't want to pollute pci_root.c.

in separated file, we can use CONFIG_HOTPLUG in Makefile instead of pci_root.c

>
> There definitely should not be another acpi_walk_namespace() and
> another list of ACPI host bridges.  The core *does* already walk the
> namespace and call acpi_pci_root_add() for us.  And the driver already
> has a list of host bridges (acpi_pci_roots).

no, we may not have acpi_pci_root there.
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