From patchwork Thu Jul 15 09:24:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 12379583 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 7088CC1B08C for ; Thu, 15 Jul 2021 09:25:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BCB161164 for ; Thu, 15 Jul 2021 09:25:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241079AbhGOJ2l (ORCPT ); Thu, 15 Jul 2021 05:28:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236202AbhGOJ2j (ORCPT ); Thu, 15 Jul 2021 05:28:39 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26F6DC061760; Thu, 15 Jul 2021 02:25:47 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id 62so5477286pgf.1; Thu, 15 Jul 2021 02:25:47 -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:in-reply-to:references; bh=m/Lq62zQC/ZLuIP1g6AP3azBlb4BnAyoWJG0y535CEU=; b=vB8qWgvszPrVov8dYj++hZ2fJhc4aqqN0FIeK3DUvRUtROJ3VgqvE830dgeKBC0Bwu TSrgVf2w77p69NsuDjWaxXZnlHaB4yRny1PKlaCDJ+n85Rt5z70tSE81AMV6eevARIF8 KQ1h6l89bZKSUOE+wPcZB58SVikjE6qMOWba57l9uzPBKQyFs57IXnhCa8klKFfrxK5z yP7rDmjMwp+1vmk3PG4n6H5nHnUX0t5L1fLfBnA6TVGD3vOa/Djr567QLl8paFbM+iqW DMwMXQDTHTs1kGsg0woaBR3q0xUwA/j91oayQDrrBaojJ7NzYI6cM7h/730Yjc+59kww P6DA== 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:in-reply-to :references; bh=m/Lq62zQC/ZLuIP1g6AP3azBlb4BnAyoWJG0y535CEU=; b=sZMa6+ZdBovTxR4jUpGJO8XnFhZ7OaZZInQMEvieqSuz8VxvVk6rLOVZi/IokC6Bjk 7UTvEjpWyjKVtFTmm7tOz1wvZWgwMLuGsqYvO4lub0qkmuElzpHxrWChi+2SydiRsEyA Sol3jqd8uPwcgVEfnkGAWsGLVptdlRCEuTt3Y6Q7nFivBKGkNOg39UK+rE2ZBUJDpCmH +vWm8W5dBadn9Ub8hyivh7mlFwiVVcTq+d6nlO/4h7RlQObHLWOMGHQaQyYwDV1UwPp5 9h/d+5HoD16OdszCJAE0FgWzbxg7wo8n4RgLpdveMTXso9AR/2gD5TlRc646AcnSl/Xl pS8w== X-Gm-Message-State: AOAM530nfHV2iG4hXi6/7mx3RQ2GgnEsVHk/RYAxnN0sCEh7Wfb4yCBW +jH65E0YMxK8GCqMnJb9Uyw= X-Google-Smtp-Source: ABdhPJzu45VGLxWM4fORPzTRwfpeV4fv13X1p6VBNpeHKocOwsluXxeGLD4lvtI1wJvBI6bZNohAPg== X-Received: by 2002:a05:6a00:158e:b029:32b:9de5:a198 with SMTP id u14-20020a056a00158eb029032b9de5a198mr3741860pfk.3.1626341146759; Thu, 15 Jul 2021 02:25:46 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([137.59.103.165]) by smtp.gmail.com with ESMTPSA id 11sm6662503pge.7.2021.07.15.02.25.42 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Jul 2021 02:25:46 -0700 (PDT) From: dillon.minfei@gmail.com To: mchehab@kernel.org, mchehab+huawei@kernel.org, hverkuil-cisco@xs4all.nl, ezequiel@collabora.com, gnurou@gmail.com, pihsun@chromium.org, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org Cc: patrice.chotard@foss.st.com, hugues.fruchet@foss.st.com, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, Dillon Min Subject: [PATCH v2 6/9] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform Date: Thu, 15 Jul 2021 17:24:25 +0800 Message-Id: <1626341068-20253-17-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1626341068-20253-1-git-send-email-dillon.minfei@gmail.com> References: <1626341068-20253-1-git-send-email-dillon.minfei@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Dillon Min For platforms without MMU the m2m provides a helper method v4l2_m2m_get_unmapped_area(), The mmap() routines will call this to get a proposed address for the mapping. More detailed information about get_unmapped_area can be found in Documentation/nommu-mmap.txt Signed-off-by: Dillon Min --- v2: fix the warrnings from checkpatch.pl --strict, thanks Hans drivers/media/v4l2-core/v4l2-mem2mem.c | 21 +++++++++++++++++++++ include/media/v4l2-mem2mem.h | 5 +++++ 2 files changed, 26 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c index e7f4bf5bc8dd..e2654b422334 100644 --- a/drivers/media/v4l2-core/v4l2-mem2mem.c +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -966,6 +966,27 @@ int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, } EXPORT_SYMBOL(v4l2_m2m_mmap); +#ifndef CONFIG_MMU +unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + struct v4l2_fh *fh = file->private_data; + unsigned long offset = pgoff << PAGE_SHIFT; + struct vb2_queue *vq; + + if (offset < DST_QUEUE_OFF_BASE) { + vq = v4l2_m2m_get_src_vq(fh->m2m_ctx); + } else { + vq = v4l2_m2m_get_dst_vq(fh->m2m_ctx); + pgoff -= (DST_QUEUE_OFF_BASE >> PAGE_SHIFT); + } + + return vb2_get_unmapped_area(vq, addr, len, pgoff, flags); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_get_unmapped_area); +#endif + #if defined(CONFIG_MEDIA_CONTROLLER) void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev) { diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h index 5a91b548ecc0..fdbd5257e020 100644 --- a/include/media/v4l2-mem2mem.h +++ b/include/media/v4l2-mem2mem.h @@ -495,6 +495,11 @@ __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct vm_area_struct *vma); +#ifndef CONFIG_MMU +unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags); +#endif /** * v4l2_m2m_init() - initialize per-driver m2m data *