From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: Yinghai Lu <yinghai.lu@oracle.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Graham Ramsey <ramsey.graham@ntlworld.com>,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
Robert Richter <robert.richter@amd.com>,
Harald Welte <HaraldWelte@viatech.com>,
Joseph Chan <JosephChan@via.com.tw>, Jiri Slaby <jslaby@suse.cz>,
Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dominik Brodowski <linux@dominikbrodowski.net>
Subject: Re: [PATCH -v2] x86, pci: Handle fallout pci devices with peer root bus
Date: Mon, 14 Jun 2010 14:00:22 -0600 [thread overview]
Message-ID: <201006141400.22653.bjorn.helgaas@hp.com> (raw)
In-Reply-To: <4C167B30.2080307@oracle.com>
On Monday, June 14, 2010 12:55:44 pm Yinghai Lu wrote:
> On 06/14/2010 11:39 AM, H. Peter Anvin wrote:
> > On 06/14/2010 11:34 AM, Bjorn Helgaas wrote:
> >>
> >> I made the point there that an HT chain may contain multiple HT/PCI
> >> host bridges, but you are stuck on the idea that "one HT chain == one
> >> PCI root bus."
>
> should be.
>
> >> I have not found the "one PCI host bridge per HT chain" requirement
> >> in the HT spec (if you find it, please point me to it).
>
> according to my experience with LinuxBIOS. AMD chipset, nvidia and serverworks (broadcom)
I'm afraid I'm still not convinced.
> >> If an HT chain may contain multiple HT/PCI host bridges, then it's
> >> obvious that the HT host bridge registers read by amd_bus.c don't
> >> contain enough information to correctly assign address space to the
> >> PCI root buses.
>
> the host bridges is on AMD CPUs,
Don't confuse the HT host bridge with the PCI host bridge. The HT I/O spec
is quite clear that it uses "host bridge" to refer to the HT host bridge,
i.e., the interface between CPUs and a HyperTransport link.
I agree that the *HT host bridge* is indeed on the AMD CPU. But that is
certainly not the same as the PCI host bridge that bridges between an HT
link and a PCI bus.
See sections 4.9.4 (HT host bridge) and 7.4 (HT/PCI host bridge), for
example.
Bjorn
next prev parent reply other threads:[~2010-06-14 20:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-19 15:13 x86/pci Oops with CONFIG_SND_HDA_INTEL Graham Ramsey
2010-05-19 16:44 ` Bjorn Helgaas
2010-05-19 17:16 ` Graham Ramsey
2010-05-19 18:01 ` Yinghai
2010-05-19 22:47 ` Graham Ramsey
2010-05-20 0:03 ` Yinghai
2010-05-20 0:22 ` Jesse Barnes
2010-05-20 0:36 ` Yinghai
2010-05-20 17:08 ` [Bug 16007] " Bjorn Helgaas
2010-06-02 16:58 ` Bjorn Helgaas
2010-06-11 21:49 ` Bjorn Helgaas
2010-06-11 22:08 ` Yinghai Lu
2010-06-11 23:06 ` Yinghai Lu
2010-06-14 14:18 ` Bjorn Helgaas
2010-06-14 17:47 ` [PATCH -v2] x86, pci: Handle fallout pci devices with peer root bus Yinghai Lu
2010-06-14 18:14 ` Jesse Barnes
2010-06-14 18:22 ` Yinghai Lu
2010-06-14 18:34 ` Bjorn Helgaas
2010-06-14 18:39 ` H. Peter Anvin
2010-06-14 18:55 ` Yinghai Lu
2010-06-14 20:00 ` Bjorn Helgaas [this message]
2010-06-14 20:08 ` H. Peter Anvin
2010-06-14 20:20 ` Bjorn Helgaas
2010-06-14 21:10 ` H. Peter Anvin
2010-06-15 1:49 ` Bjorn Helgaas
2010-06-15 1:56 ` H. Peter Anvin
2010-06-15 15:30 ` Bjorn Helgaas
2010-06-14 19:43 ` Bjorn Helgaas
2010-06-21 17:28 ` [Bug 16007] x86/pci Oops with CONFIG_SND_HDA_INTEL Bjorn Helgaas
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