From owner-freebsd-acpi@FreeBSD.ORG Tue Oct 28 15:31:50 2008 Return-Path: Delivered-To: freebsd-acpi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0E2881065679; Tue, 28 Oct 2008 15:31:50 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (bigknife-pt.tunnel.tserv9.chi1.ipv6.he.net [IPv6:2001:470:1f10:75::2]) by mx1.freebsd.org (Postfix) with ESMTP id 86C298FC1D; Tue, 28 Oct 2008 15:31:49 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from localhost.corp.yahoo.com (john@localhost [IPv6:::1]) (authenticated bits=0) by server.baldwin.cx (8.14.3/8.14.3) with ESMTP id m9SFUCWo024647; Tue, 28 Oct 2008 11:31:05 -0400 (EDT) (envelope-from jhb@freebsd.org) From: John Baldwin To: Serge Semenenko Date: Tue, 28 Oct 2008 11:08:55 -0400 User-Agent: KMail/1.9.7 References: <4903A120.7040003@FreeBSD.org> <200810271142.59666.jhb@freebsd.org> <4906450E.4030700@a-1.com.ua> In-Reply-To: <4906450E.4030700@a-1.com.ua> MIME-Version: 1.0 Content-Type: text/plain; charset="koi8-u" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200810281108.56218.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [IPv6:::1]); Tue, 28 Oct 2008 11:31:05 -0400 (EDT) X-Virus-Scanned: ClamAV 0.93.1/8526/Tue Oct 28 09:21:35 2008 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-2.6 required=4.2 tests=BAYES_00,NO_RELAYS autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: freebsd-acpi@freebsd.org, Alexander Motin Subject: Re: PCIe bridges resources disappearing with ACPI enabled. X-BeenThere: freebsd-acpi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: ACPI and power management development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Oct 2008 15:31:50 -0000 On Monday 27 October 2008 06:47:42 pm Serge Semenenko wrote: > John Baldwin wrote: > > On Saturday 25 October 2008 06:43:44 pm Alexander Motin wrote: > > > >> Hi. > >> > >> I have spent whole day trying to investigate strange problem of my Acer > >> TM6292 laptop (965GM+ICH8M). When booted with ACPI enabled, all three > >> of PCIe-to-PCIe bridges appearing completely without I/O resources: > >> pcib1: irq 17 at device 28.0 on pci0 > >> pcib1: domain 0 > >> pcib1: secondary bus 2 > >> pcib1: subordinate bus 3 > >> pcib1: I/O decode 0x0-0x0 > >> pcib1: no prefetched decode > >> ... > >> At the same time, with ACPI disabled, resources are present. There are > >> some different problem with IRQ in that case, but it is another > >> question, not so interesting to me. > >> > >> I have tried both IO and memory mapped PCIe configuration registers > >> without success. > >> > >> I have made heavy digging trying to find where resources disappearing. I > >> have even added debug printing inside pcireg_cfgwrite() and > >> pciereg_cfgwrite() to trace if somebody erases it and found nothing. > >> Nothing writes into that devices configuration registers. > >> > > > > The SMI handle could be clearing the BARs when ACPI is enabled for some > > reason. Windows and Linux are smart enough to alloc resources for bridges, > > but FreeBSD isn't yet. > > > > > > Thanks for a good tip. Elimination of "Store (Zero, SMIC)" string from > ASL code has solved the problem. That may not be a good solution though as there may be other things the SMI handler is doing to enable ACPI support that the OS is dependent on. -- John Baldwin