From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754039Ab1I1KJy (ORCPT ); Wed, 28 Sep 2011 06:09:54 -0400 Received: from cantor2.suse.de ([195.135.220.15]:46370 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752017Ab1I1KJw (ORCPT ); Wed, 28 Sep 2011 06:09:52 -0400 Date: Wed, 28 Sep 2011 12:09:51 +0200 Message-ID: From: Takashi Iwai To: "Rafael J. Wysocki" Cc: Yinghai Lu , linux-kernel@vger.kernel.org, "H. Peter Anvin" , oneukum@suse.de, x86@kernel.org, Linux PM mailing list , Ingo Molnar Subject: Re: S4 resume broken since 2.6.39 (3.1, too) In-Reply-To: <201109271856.44300.rjw@sisk.pl> References: <4E813464.80105@oracle.com> <201109271856.44300.rjw@sisk.pl> User-Agent: Wanderlust/2.15.6 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.7 Emacs/23.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org At Tue, 27 Sep 2011 18:56:44 +0200, Rafael J. Wysocki wrote: > > On Tuesday, September 27, 2011, Takashi Iwai wrote: > > At Mon, 26 Sep 2011 19:26:44 -0700, > > Yinghai Lu wrote: > > > > > > On 09/22/2011 11:11 AM, Takashi Iwai wrote: > > > > > > > At Thu, 22 Sep 2011 07:33:17 -0700, > > > > Yinghai Lu wrote: > > > >> > > > >> On Wed, Sep 21, 2011 at 11:48 AM, Rafael J. Wysocki wrote: > > > >>> It looks like init_memory_mapping() is sometimes called with "end" > > > >>> beyond the last mapped PFN and it explodes when we try to write stuff to > > > >>> that address during image restoration. > > > >>> > > > >>> IOW, the Yinghai's assumption that init_memory_mapping() would always be > > > >>> called with a "good end" on x86_64 was overomptimistic. > > > >> > > > >> for 64bit x86, kernel_physical_mapping_init() will use > > > >> map_low_page()/call early_memmap() to access ram for page_table that is above > > > >> rather last mapped PFN. > > > >> > > > >> the point is: > > > >> on system with 64g, usable ram will be [0,2048m), [4g, 64g) > > > >> init_memory_mapping will be called two times for them. > > > >> before putting page_table high, > > > >> page table will be two parts: one is just below 512M, and one below 2048m. > > > >> after putting page_table high, > > > >> page table will be two parts: one is just below 2048M, and one below 64G. > > > > > > > > So, how can this change break S4 resume? > > > > > > > > > not sure. > > > > > > seems resume has it's own page table during transition... > > > > > > > > > > Any hint for further debugging? > > > > > > > > > you may try to insert dead loop in arch/x86/power/hibernate_asm_64.S::restore_image or core_restore_code > > > > > > to see which part cause reset. > > > > That's the answer I was afraid of :) > > I wonder. Does hibernation work on the machine in question with > acpi_sleep=nonvs and if so, is the problem reproducible with this > setting? It still shows the same problem. Reboots after a few S4 cycles. I'll test kernel S4. thanks, Takashi