From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pz0-f51.google.com ([209.85.210.51]:54323 "EHLO mail-pz0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757350Ab2D0OKo (ORCPT ); Fri, 27 Apr 2012 10:10:44 -0400 Received: by dadz8 with SMTP id z8so1069994dad.10 for ; Fri, 27 Apr 2012 07:10:43 -0700 (PDT) Message-ID: <4F9AA8DA.3050907@gmail.com> Date: Fri, 27 Apr 2012 22:10:34 +0800 From: Jiang Liu MIME-Version: 1.0 To: Richard Yang CC: linux-pci@vger.kernel.org, bhelgaas@google.com Subject: Re: Does my understanding correct? References: <20120427092704.GA22529@richard> In-Reply-To: <20120427092704.GA22529@richard> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-pci-owner@vger.kernel.org List-ID: For PCI, there's no internal bus Bus#4 in the left bottom device. On 04/27/2012 05:27 PM, Richard Yang wrote: > All, > > I draw a picture about the physical layout on a part of the pci system. > > Each block represent a bridge or a device. > Am I correct? > > +-----------------------------+ > | | > | | > | Bus#2 | > | ------------------ | > | | > | | > | | > | +-------------+ > | |DownStream |02:00.0 pci_dev > +---------------+-------+-----+ > | Bus#3 > ---------------+------------------------------------------+--- > | | > | | > +---------------+-------+-----+ +---------------+----+--+-----+ > | |UpStream |03:00.0 | |UpStream |03:01.0 > | +-------------+ | +-------------+ a normal device > | | | | > | | | | > | Bus#4 | | | > | ------------------- | | | > | +----------+ | | > | |DownStream| | | > +-----------------------+-----+ +-----------------------------+ > | > | Bus#5 > ------------+------------ > >