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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B2A28C33CA4 for ; Sat, 11 Jan 2020 10:09:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B25720882 for ; Sat, 11 Jan 2020 10:09:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737360; bh=3BSS7eqYolKQLg45blKvyGb2gdE7a0VSAT/zm/DuAvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xvOssc3tRDhxJlgfMGnIOoqc1rJGTMIc/T4bnxcqMzzEO9Y5o7qhGXdEyIvKR/pIM JooZ1BcJWMrtgeTOHt1WLSYDQFhW6lM4E9WROocXI8/zeU8bLCvkgk4RMzV8RFGLFg /OoIAthBwdLjHCFvq4ZiqtkDL9eJHJy7tyAg0rdo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729743AbgAKKJT (ORCPT ); Sat, 11 Jan 2020 05:09:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:45058 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729097AbgAKKJS (ORCPT ); Sat, 11 Jan 2020 05:09:18 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5C99E2082E; Sat, 11 Jan 2020 10:09:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737358; bh=3BSS7eqYolKQLg45blKvyGb2gdE7a0VSAT/zm/DuAvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zh36AS5qyj9vDOxr9DYm1gKQPbrYYgadeqiPfrPuNAQI5j/3ZmaQ0whnrTLwGd1Fy nqiB3DzD30wJMG9XuUxd2meGjAx3RoIW4mj1WwNnjJh/6dJFgJCjrTOi4pB3ZuthL2 4c+v6pMiLmZoV3uwt2lb8YopzHQgz6eU5qiKhWuI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christian Zigotzky , Mike Rapoport , Christoph Hellwig , Michael Ellerman , Sasha Levin Subject: [PATCH 4.14 22/62] powerpc: Ensure that swiotlb buffer is allocated from low memory Date: Sat, 11 Jan 2020 10:50:04 +0100 Message-Id: <20200111094844.242659539@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094837.425430968@linuxfoundation.org> References: <20200111094837.425430968@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Rapoport [ Upstream commit 8fabc623238e68b3ac63c0dd1657bf86c1fa33af ] Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a system has more physical memory than this limit, the swiotlb buffer is not addressable because it is allocated from memblock using top-down mode. Force memblock to bottom-up mode before calling swiotlb_init() to ensure that the swiotlb buffer is DMA-able. Reported-by: Christian Zigotzky Signed-off-by: Mike Rapoport Reviewed-by: Christoph Hellwig Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20191204123524.22919-1-rppt@kernel.org Signed-off-by: Sasha Levin --- arch/powerpc/mm/mem.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 30bf13b72e5e..3c5abfbbe60e 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -353,6 +353,14 @@ void __init mem_init(void) BUILD_BUG_ON(MMU_PAGE_COUNT > 16); #ifdef CONFIG_SWIOTLB + /* + * Some platforms (e.g. 85xx) limit DMA-able memory way below + * 4G. We force memblock to bottom-up mode to ensure that the + * memory allocated in swiotlb_init() is DMA-able. + * As it's the last memblock allocation, no need to reset it + * back to to-down. + */ + memblock_set_bottom_up(true); swiotlb_init(0); #endif -- 2.20.1