From patchwork Mon Apr 24 10:16:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Murzin X-Patchwork-Id: 9696015 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 47AE2601AE for ; Mon, 24 Apr 2017 10:29:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 35F182582C for ; Mon, 24 Apr 2017 10:29:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 27DBF2621D; Mon, 24 Apr 2017 10:29:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B11392582C for ; Mon, 24 Apr 2017 10:29:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=HOzFK4W549BL0cRSNOqdyuW/532cZcjfnKdHYYLBxNA=; b=qMT4y74bwUQjajWstdtQAPnTCR A8AT3Fm14o0qnoYDKbkm2/uKwpMIO1rCYnnDNZb36zZMwd2qk94OK2i2wQ7QWxbMd5vMnTvnoDYoZ Le/ctNFEdDhWTI0B3ZF4WiDmrh/gvZBAXW9DtyegBBqkcclKzGm8qmm65x/itxhEp+SIDx4rOqeR3 bLB6zXtYdIBRixPmDuris26CLBwEbK31bJ+3kJl7FZY2JRCXVjxmAEC/e0DQYeno6NBoauiqffiov hO+vAFbnuLm6wupZhrW3hlQ8JmwEtEZ3ooOCsSu4YYfO455/2OEskOQCu8VejHCUYOPO9x/38xonX fCUP7I0Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1d2bF1-0006ZQ-AO; Mon, 24 Apr 2017 10:29:11 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1d2bEy-0006T7-T2 for linux-arm-kernel@bombadil.infradead.org; Mon, 24 Apr 2017 10:29:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=cWRO6h5bhHiyevBl7IVbYT5OuNV0p+ccdPgmC1drYkA=; b=PlKbJP1gIaG5fEWEL3df5+Ycp m2UuR5KBe3O9PjA8GLGzLUPd76AfBaeaNJkysIUMRKFMw/hDkgTU5xk1+JHrrFgdjmoWCSNObCP5t nYAI8Vew7QXi4gaLzVhWpQqdhidDpURZYW67SjXbmw/8zOjQPjcy21XNOpttc0zvLl7HqWqkL5m93 m6JII/AYrmKUw1dd6XX0zxsRe7DbPqi2C+XbcQhtO4n/aDaAn4RHM1/hMaHC7TKgE30AvmLJfiIgu MgZ0x/QcfCgJtuy8OrBjIinpOBM2sHvh4BatpBMH2AGwlfiY1QJjtZaTZPur2dS1mzHsl/v1XWq6y UVKEwHNTQ==; Received: from foss.arm.com ([217.140.101.70]) by casper.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1d2b4K-0001ss-Ej for linux-arm-kernel@lists.infradead.org; Mon, 24 Apr 2017 10:18:12 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1AC1A165C; Mon, 24 Apr 2017 03:17:38 -0700 (PDT) Received: from bc-a10-1-7.euhpc.arm.com. (bc-a10-1-7.euhpc.arm.com [10.6.3.161]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 86B293F23B; Mon, 24 Apr 2017 03:17:36 -0700 (PDT) From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 6/7] ARM: NOMMU: Set ARM_DMA_MEM_BUFFERABLE for M-class cpus Date: Mon, 24 Apr 2017 11:16:56 +0100 Message-Id: <1493029017-31382-7-git-send-email-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1493029017-31382-1-git-send-email-vladimir.murzin@arm.com> References: <1493029017-31382-1-git-send-email-vladimir.murzin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170424_111808_652272_7D3C32BD X-CRM114-Status: GOOD ( 10.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sza@esh.hu, arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, kbuild-all@01.org, akpm@linux-foundation.org, robin.murphy@arm.com, alexandre.torgue@st.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Now, we have dedicated non-cacheable region for consistent DMA operations. However, that region can still be marked as bufferable by MPU, so it'd be safer to have barriers by default. Tested-by: Benjamin Gaignard Tested-by: Andras Szemzo Tested-by: Alexandre TORGUE Reviewed-by: Robin Murphy Signed-off-by: Vladimir Murzin --- arch/arm/mm/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index d731f28..7e357c6 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -1049,8 +1049,8 @@ config ARM_L1_CACHE_SHIFT default 5 config ARM_DMA_MEM_BUFFERABLE - bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K) && !CPU_V7 - default y if CPU_V6 || CPU_V6K || CPU_V7 + bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K || CPU_V7M) && !CPU_V7 + default y if CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M help Historically, the kernel has used strongly ordered mappings to provide DMA coherent memory. With the advent of ARMv7, mapping