From patchwork Thu Oct 14 10:25:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 12558211 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6537C433FE for ; Thu, 14 Oct 2021 10:25:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFC72610D0 for ; Thu, 14 Oct 2021 10:25:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230265AbhJNK1o (ORCPT ); Thu, 14 Oct 2021 06:27:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40250 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230206AbhJNK1m (ORCPT ); Thu, 14 Oct 2021 06:27:42 -0400 Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2246C061753; Thu, 14 Oct 2021 03:25:37 -0700 (PDT) Received: by mail-pf1-x42a.google.com with SMTP id v8so921767pfu.11; Thu, 14 Oct 2021 03:25:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=0kiJE6ydtmKqRe18PZUG0B4gj6oD52RxLkVjLWIgpQI=; b=R6oW9dVdAeoLwTrawZf5yrWQUPE1ZeLvT9IhoCVARM88QuAX2tu/qGKIYDMkmema25 CPHIutl43UcBsQXAlmUN/dRdW8iOC8jclQfLYHMxP8Rr3dO3hUEFId4kEK2WCMGvTgEs 5+iHT7WIK6QWYNATP+AG2BMMjnZruahpkPu8E4i9e/IMooKPgowUOlTbPlNLuG5foELc k6rW5beaIY0iJUjtymD+m6bUWb9ZytBQGzvbfyiDvySm1cdPwePNj+x+JIM74TonSXIq tkpsJbloxOE0wFWdMtbcFx7gzZ3vHvgO24gyFVRiV8lD20eLEACdtApY0asvlkWScQMv eBZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=0kiJE6ydtmKqRe18PZUG0B4gj6oD52RxLkVjLWIgpQI=; b=wcwBp/5WCjKkZ3Ur+dww8iaFbXNFpTi86zuF8zkwlGUBp9ekyMCFEFmb+HuSEyfMIO UUku/SxjHu7rl4F/L8exZeTvznKlNLEKobMNpkgWxcUg4sMpDo0ZGepNu+2yLIQbtm/d HEbCIv6v/oMGKKMmwh6yzeNgGhLWLNGX4RUiZI+Y2fsmPdZrP3zkoLWxshrzvpSZ3LTl 2BTZbXA8VrrdE7+WmpT7r865tICjHW7l4QITlb1DI1dVk9/qmpA8DRBR07eHnXsyHtk5 wBo7N4F2orE2QmejvR54D51i8Vi1UUMHg0ABmWP+8Fb7h6IyDw/akyPWbah6HIGiFa5v d60w== X-Gm-Message-State: AOAM5327Q322WBEnwK25HoZPenuT4s2yogZSO1H81d6G4/bjegVEfDXE UWl/A8585QMPWbI11rZQoj+ZipeW+zX3rg== X-Google-Smtp-Source: ABdhPJzGYLmPdVc2CLUIFEqVz5CqBh5QSElaxsGAdI5+AKge0cygzjxUFllk/UutqL98tKSu/yGVBQ== X-Received: by 2002:a63:1444:: with SMTP id 4mr3465096pgu.251.1634207137564; Thu, 14 Oct 2021 03:25:37 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([137.59.103.165]) by smtp.gmail.com with ESMTPSA id ip10sm2105939pjb.40.2021.10.14.03.25.32 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Oct 2021 03:25:37 -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, gabriel.fernandez@st.com, gabriel.fernandez@foss.st.com 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 v4 5/8] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform Date: Thu, 14 Oct 2021 18:25:03 +0800 Message-Id: <1634207106-7632-6-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1634207106-7632-1-git-send-email-dillon.minfei@gmail.com> References: <1634207106-7632-1-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 --- v4: no change. 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 *