linux-kernel - Re: [PATCH] pci: pciehp update the slot bridge res to get big range for pcie devices

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Date:	Thu, 29 Oct 2009 08:43:38 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci\@vger.kernel.org" <linux-pci@...r.kernel.org>,
	Alex Chiang <achiang@...com>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: [PATCH] pci: pciehp update the slot bridge res to get big range for pcie devices

Yinghai Lu <yinghai@...nel.org> writes:

> Eric W. Biederman wrote:
>> Yinghai Lu <yinghai@...nel.org> writes:
>>> after closing look up the code, it looks it will not break your setup.
>>>
>>> 1. before the patches:
>>> a. when master card is inserted, all bridge in that card will get assigned with min_size
>>> b. when new cards is inserted to those slots in master card, will get assigned in the bridge size.
>>>
>>> 2. after the patches: v5
>>> a. booted up, all leaf bridge mmio get clearred.
>>> b. when master card is inserted, all bridge in that card will get assigned with min_size, and master bridge will be sum of them
>>> c. when new cards is inserted to those slots in master card, will get assigned in the bridge size.
>>>
>>> can you check those two patches in your setup to verify it?
>> 
>> I have a much simpler case I will break, as I tried something similar by accident.
> which kernel version?
>> 
>> AMD cpu MCP55 with one pcie port setup as hotplug.
>> The system only has 2GB of RAM.  So plenty of space for pcie devices.
>
> one or two ht chains?

One chain.

> do you still have lspci -tv with it?
>
>> 
>> If the firmware assigns nothing and linux at boot time assigns the pci mmio space:
>> Reads from the bar of the hotplugged device work
>> Writes to the bar of the hotplugged device, cause further writes to go to lala land.
>> 
>> So I had to have the firmware make the assignment, because only it knows the
>> details of the hidden AMD bar registers for each hypertransport chain etc.
>
> that mean kernel doesn't get peer root bus res probed properly

How do you do that without having drivers for the peer root bus?

Eric
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