Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754254AbbHXLtL (ORCPT ); Mon, 24 Aug 2015 07:49:11 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:34250 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754104AbbHXLtI (ORCPT ); Mon, 24 Aug 2015 07:49:08 -0400 Date: Mon, 24 Aug 2015 12:49:03 +0100 From: Leif Lindholm To: Haojian Zhuang Cc: Mark Rutland , Leo Yan , Rob Herring , Pawel Moll , Ian Campbell , Kumar Gala , Catalin Marinas , Will Deacon , Jassi Brar , Bintian Wang , Yiping Xu , Wei Xu , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "guodong.xu@linaro.org" , Jian Zhang , Zhenwei Wang , Haoju Mo , Dan Zhao , "kongfei@hisilicon.com" , Guangyue Zeng Subject: Re: [PATCH v1 3/3] arm64: dts: add Hi6220 mailbox node Message-ID: <20150824114903.GT10728@bivouac.eciton.net> References: <1439977055-1747-1-git-send-email-leo.yan@linaro.org> <1439977055-1747-4-git-send-email-leo.yan@linaro.org> <20150821184059.GB2000@svinekod> <20150824091845.GA28290@leoy-linaro> <20150824095144.GA7139@leverpostej> <1440411596.3517.12.camel@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1440411596.3517.12.camel@linaro.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1877 Lines: 48 On Mon, Aug 24, 2015 at 06:19:56PM +0800, Haojian Zhuang wrote: > > If your EFI memory map describes the memory as mappable, it is wrong. > > When kernel is working, kernel will create its own page table based on > UEFI memory map. Since it's reserved in DTS file as Leo's patch, it'll > be moved to reserved memblock. Why is it wrong? > > In the second, UEFI is firmware. When it's stable, nobody should change > it without any reason. Much like the memory map. > These reserved memory are used in mailbox driver. > Look. It's driver, so it could be changed at any time. No, it is a set of regions of memory set aside for use by a different master in the system as well as communications with that master. The fact that there is a driver somewhere that is aware of this is entirely beside the point. All agents in the system must adher to this protocol. > Why do you want > to UEFI knowing this memory range? Do you hope UEFI to change when > mailbox driver is changed? Yes. UEFI is a runtime environment. Having random magic areas not to be touched will cause random pieces of software running under it to break horribly or break other things horribly. Unless you mark them as reserved in the UEFI memory map. At which point the Linux kernel will automatically ignore them, and the proposed patch is redundant. So, yes, if you want a system that can boot reliably, run testsuites (like SCT or FWTS), run applications (like fastboot ... or the EFI stub kernel itself), then any memory regions that is reserved for mailbox communication (or other masters in the system) _must_ be marked in the EFI memory map. / Leif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/