From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLACK, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAE72C433B4 for ; Thu, 20 May 2021 05:46:49 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5428E610CB for ; Thu, 20 May 2021 05:46:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5428E610CB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=csgroup.eu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FlzJS0xDrz307T for ; Thu, 20 May 2021 15:46:48 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=csgroup.eu (client-ip=93.17.235.10; helo=pegase2.c-s.fr; envelope-from=christophe.leroy@csgroup.eu; receiver=) Received: from pegase2.c-s.fr (pegase2.c-s.fr [93.17.235.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FlzJ50zJsz2xfw for ; Thu, 20 May 2021 15:46:26 +1000 (AEST) Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4FlzJ011JVz9sVp; Thu, 20 May 2021 07:46:24 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Alfvr71Etuz1; Thu, 20 May 2021 07:46:24 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4FlzJ0054Tz9sVn; Thu, 20 May 2021 07:46:24 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id DA9948B804; Thu, 20 May 2021 07:46:23 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id GW8cKQj9goTz; Thu, 20 May 2021 07:46:23 +0200 (CEST) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 81A4F8B7E0; Thu, 20 May 2021 07:46:23 +0200 (CEST) Subject: Re: [RFC PATCH kernel] powerpc: Fix early setup to make early_ioremap work To: Alexey Kardashevskiy , linuxppc-dev@lists.ozlabs.org References: <20210520032919.358935-1-aik@ozlabs.ru> From: Christophe Leroy Message-ID: <467a5a5f-7fab-b6b1-e81f-85518378f4b8@csgroup.eu> Date: Thu, 20 May 2021 07:46:22 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210520032919.358935-1-aik@ozlabs.ru> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chris Packham Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Le 20/05/2021 à 05:29, Alexey Kardashevskiy a écrit : > The immediate problem is that after > 0bd3f9e953bd ("powerpc/legacy_serial: Use early_ioremap()") > the kernel silently reboots. The reason is that early_ioremap() returns > broken addresses as it uses slot_virt[] array which initialized with > offsets from FIXADDR_TOP == IOREMAP_END+FIXADDR_SIZE == > KERN_IO_END- FIXADDR_SIZ + FIXADDR_SIZE == __kernel_io_end which is 0 > when early_ioremap_setup() is called. __kernel_io_end is initialized > little bit later in early_init_mmu(). > > This fixes the initialization by swapping early_ioremap_setup and > early_init_mmu. Hum ... Chris tested it on a T2080RDB, that must be a book3e. So we missed it. I guess your fix is right. > > This also fixes IOREMAP_END to use FIXADDR_SIZE defined just next to it, > seems to make sense, unless there is some weird logic with redefining > FIXADDR_SIZE as the compiling goes. Well, I don't think the order of defines matters, the change should be kept out of the fix. But if you want it anyway, then I'd suggest to move it before IOREMAP_BASE in order to keep the 3 IOREMAP_xxx together. > > Signed-off-by: Alexey Kardashevskiy Reviewed-by: Christophe Leroy > --- > arch/powerpc/include/asm/book3s/64/pgtable.h | 2 +- > arch/powerpc/kernel/setup_64.c | 3 ++- > 2 files changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h > index a666d561b44d..54a06129794b 100644 > --- a/arch/powerpc/include/asm/book3s/64/pgtable.h > +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h > @@ -325,8 +325,8 @@ extern unsigned long pci_io_base; > #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) > #define IOREMAP_BASE (PHB_IO_END) > #define IOREMAP_START (ioremap_bot) > -#define IOREMAP_END (KERN_IO_END - FIXADDR_SIZE) > #define FIXADDR_SIZE SZ_32M > +#define IOREMAP_END (KERN_IO_END - FIXADDR_SIZE) > > /* Advertise special mapping type for AGP */ > #define HAVE_PAGE_AGP > diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c > index b779d25761cf..ce09fe5debf4 100644 > --- a/arch/powerpc/kernel/setup_64.c > +++ b/arch/powerpc/kernel/setup_64.c > @@ -369,11 +369,12 @@ void __init early_setup(unsigned long dt_ptr) > apply_feature_fixups(); > setup_feature_keys(); > > - early_ioremap_setup(); > > /* Initialize the hash table or TLB handling */ > early_init_mmu(); > > + early_ioremap_setup(); > + > /* > * After firmware and early platform setup code has set things up, > * we note the SPR values for configurable control/performance >