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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 9BB0CC2D0DA for ; Fri, 27 Dec 2019 18:17:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6ECCC20CC7 for ; Fri, 27 Dec 2019 18:17:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577470639; bh=BnLs3eJXQ2CZywcsuDZU0bHvjjYjw5q6uT2TT9dO8M0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O14bcKlz5lBtH30q8eo6gmfnNvG8VW7DmWLLGG/f6q9NGkL5cksaOnIBb5hN7WzEU pzTfRvV6wKL2VeetEMF5jEqanJaOrVg7WckUv3Ez9XF6V1gP59U0bI6Q6owcJek4MC nxzjYXGec48pdJtW3hKcQsm7whnCQFWUsAzILTlI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728146AbfL0SQE (ORCPT ); Fri, 27 Dec 2019 13:16:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:41180 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728214AbfL0SQD (ORCPT ); Fri, 27 Dec 2019 13:16:03 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9767820CC7; Fri, 27 Dec 2019 18:16:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577470563; bh=BnLs3eJXQ2CZywcsuDZU0bHvjjYjw5q6uT2TT9dO8M0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ePeOFcNucVBa1B8L6DoNz2jsjFjk7tWOdjT10CozsA1VqXF/iQf9LoMumeysQ8s/a ZrmoMUjhN0ivnzwR130gmMqRld5493nxOD2N4itpm1EeEIk7Tk/9GuMdVIiDuO0pg4 yTZjtj3+O1j72XWjyBokzs2Ubq5AOuLmFNw4ZSzQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mike Rapoport , Christian Zigotzky , Christoph Hellwig , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.4 11/25] powerpc: Ensure that swiotlb buffer is allocated from low memory Date: Fri, 27 Dec 2019 13:15:35 -0500 Message-Id: <20191227181549.8040-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191227181549.8040-1-sashal@kernel.org> References: <20191227181549.8040-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 1efe5ca5c3bc..5bb2c89d55c8 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -330,6 +330,14 @@ 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