From patchwork Tue Oct 26 07:11:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 12583943 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 AD500C433EF for ; Tue, 26 Oct 2021 07:12:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95B5660E74 for ; Tue, 26 Oct 2021 07:12:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234713AbhJZHOW (ORCPT ); Tue, 26 Oct 2021 03:14:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234648AbhJZHOU (ORCPT ); Tue, 26 Oct 2021 03:14:20 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03A9EC061243; Tue, 26 Oct 2021 00:11:57 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id g184so13251651pgc.6; Tue, 26 Oct 2021 00:11:56 -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=YJt0hdV4kzdXc6X1C3SE5PDn2rhPDieOGx+r2tKEjZE=; b=HYeqwC260+v7LmqrfNhi8BodcmsCMqshSPxR4nFgNmstTkvQUcDqsmYoDqpRDnhe0P N5R0YrW7+b3NDKIWHa43KY1ni03gfzLWU/cTAfs8NVoWpF4D6Al30KM7inCMqDpWPvf0 DPKX0XEJVC14/ygeP24nTEtaIOBeh8/lM21tGKocXH4AcL97bF/mWquqB80SClSkjoYz S0bRkgzsifWRI9BNZ8KSTYLpiRnnmFb9IJz3OxLNxneUQre9GLLxSLXuHX3Dawmq5cuw SVSEDZTP//P2wkdNj+EuuRCmQRMINpqX6Kvy9VAXW/4xAyYd7WiAgPq/mPiipksiKYJ5 AFSA== 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=YJt0hdV4kzdXc6X1C3SE5PDn2rhPDieOGx+r2tKEjZE=; b=lxF55rJGQKZ8IiCCRXVe7z/fpFi/pAXO7NrYrrQibMsQrtrYlUqOE5kT5twoWIwkMm srT3o3pAdzVb6s1ZPDk07QcdpdTcoHGo/Es3aYaAOKRArBePFdUuCR10vVHCVpDNDfy/ jbqFRKelTR/c2QXxdP4+qgNFBdlTjnHZaxZEUpJ4qEMvkzns8LTUIWPUpZub7n4JUwD7 CrCdGvTpneX0e5QP4yl2gxky0dBPSKPd79ySlpuOCOIDSdBj9xigaawD6nGLEjPXqO3T 9onYfrAVpY6z4duFSNkOHEnhWmgn33pjlN+5rgqUQGFSY4YnP4IRzhbmahAuJOu0KPTr SDXw== X-Gm-Message-State: AOAM530VdPqLY8o61GypT9+1qhmQ0k+DUpme+llkQI7hyvRb8ffMhDw9 NWkO+rutpQWSRmwEW5Fmv+o= X-Google-Smtp-Source: ABdhPJyKVKyyzYptJNlN1szbfFlQqhI4CiYZWnN19Y5i6NZft9uz62l9xG7RV3OpWbGicirrwFhc4w== X-Received: by 2002:a05:6a00:c8a:b0:47b:ff6e:4cf3 with SMTP id a10-20020a056a000c8a00b0047bff6e4cf3mr7880068pfv.50.1635232316568; Tue, 26 Oct 2021 00:11:56 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([137.59.103.165]) by smtp.gmail.com with ESMTPSA id l11sm23243367pjg.22.2021.10.26.00.11.51 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Oct 2021 00:11:56 -0700 (PDT) From: Dillon Min 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, lkp@intel.com, kbuild-all@lists.01.org, llvm@lists.linux.dev Subject: [PATCH v7 05/10] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform Date: Tue, 26 Oct 2021 15:11:17 +0800 Message-Id: <1635232282-3992-6-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1635232282-3992-1-git-send-email-dillon.minfei@gmail.com> References: <1635232282-3992-1-git-send-email-dillon.minfei@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 --- 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 *