From patchwork Mon Jun 8 08:30:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 199431 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=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=no 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 4A2ADC433E0 for ; Mon, 8 Jun 2020 08:30:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 17FAA206D5 for ; Mon, 8 Jun 2020 08:30:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YmELALbk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729060AbgFHIao (ORCPT ); Mon, 8 Jun 2020 04:30:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728951AbgFHIan (ORCPT ); Mon, 8 Jun 2020 04:30:43 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0AFDC08C5C3; Mon, 8 Jun 2020 01:30:43 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id m2so5698847pjv.2; Mon, 08 Jun 2020 01:30:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=G7NT+IIMlEpev8mMIld6zg2khxnR9LKx4QWnMSa761g=; b=YmELALbkitxP2ggbooUEURujMSINXmryqerQhxXRvVK6hlFggjqe6vjydN5E/hscIs ew1S4hSJF0H5QNibJbvP5ZZQVzfbxfT6ZWE2VGHUwUZ/5r2MjtsMn4Wi9gD0v5zWBYjX /BRG23DsNHZGYdn4ji4uba2IFP66yOE+UuP5whqQn3I5qHMBV5AUdtWXtQsXfBUl+DYw myfg/t3rN2flP3HLisi5oI0ljM/WBOisQVl5L7VqbL8HJIEnnwrRlll0TC4R+avIrDOL cP7JQa3ERxtbpid31OYGSdlRGxXXvm6sjzsquzBA1ywHqLWwcE4V8rPbMKBPITJ1gVN3 o6bw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=G7NT+IIMlEpev8mMIld6zg2khxnR9LKx4QWnMSa761g=; b=gmb7a9J5jhbbGvOadTdv9zQWAu+RInSHZvOBaWxBhpnKObpkJNTP+Jh0Ebwa7+ej68 aNeM3TnspqOwVNQTbbr2gGB8JR2C5FBrKSsfR23+NxnhYtVpCf1MimmoVUYuCksEk/NP NLTMMV5F/DiTY+LIxMxFKt3C0mfkcgDIqRODscnlGFEWVRQ4UO4sxVycabxDSfdoCllI C504Fs7xGZXjMqxiUFtjdke8um2HLW3fn7/gRtcL654dYnPEwYD+b7T1P4HuQO3jQK3k HpFVljWUAX/fI0CRz3TUAa05BH4SXnL1HyWW2Xl9aCfcSz75ocVsDUK7e3TerhdFBdNa 7mWg== X-Gm-Message-State: AOAM530RALdgHp0+KTrilrwAFQknFxQsfYKXKitfws4gjWCJIelQfIyv TsXzXpuAFsEuEaeMualKm0w= X-Google-Smtp-Source: ABdhPJxObPDhvUNU2fgGSyXqPnus/jX1jjU6Fcb/mjYz/7uwefMtlM+VUAjOyTj6a7++QyGKeDXCqQ== X-Received: by 2002:a17:90a:886:: with SMTP id v6mr15165288pjc.161.1591605043466; Mon, 08 Jun 2020 01:30:43 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([103.206.191.42]) by smtp.gmail.com with ESMTPSA id 27sm1210829pjg.19.2020.06.08.01.30.40 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Jun 2020 01:30:43 -0700 (PDT) From: dillon.minfei@gmail.com To: robh+dt@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux@armlinux.org.uk, vladimir.murzin@arm.com, kstewart@linuxfoundation.org, allison@lohutok.net, info@metux.net, tglx@linutronix.de Cc: devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dillon min Subject: [PATCH 0/2] Use 'arm_nommu_dma_ops' to handle dma memroy if device offer consistent dma memory region Date: Mon, 8 Jun 2020 16:30:36 +0800 Message-Id: <1591605038-8682-1-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: dillon min when do mmap on /dev/fb0, we will get -6 error on cortex-m3/m4 or armv7m platform without cache support, this is caused by following reason: on armv7m platform, if no cache support, we will use dma direct mapping, but, this is not support on !MMU hardware, just return '-ENXIO' error so, add use_reserved_mem() for these armv7m hardware but no-cache support. eg, stm32f429/stm32f469. verified on stm32f469-disco board, mmap frambuffer to userspace. dillon min (2): ARM: dts: stm32: Setup 4M bytes reserved memory for mmap arm-nommu: Add use_reserved_mem() to check if device support reserved memory arch/arm/boot/dts/stm32f469-disco.dts | 14 ++++++++++++++ arch/arm/mm/dma-mapping-nommu.c | 28 +++++++++++++++++++++++++++- 2 files changed, 41 insertions(+), 1 deletion(-)