From patchwork Mon Oct 18 05:04:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 12565093 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 25433C4321E for ; Mon, 18 Oct 2021 05:05:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F4586135F for ; Mon, 18 Oct 2021 05:05:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230191AbhJRFHl (ORCPT ); Mon, 18 Oct 2021 01:07:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230024AbhJRFHd (ORCPT ); Mon, 18 Oct 2021 01:07:33 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0CD7C061770; Sun, 17 Oct 2021 22:05:20 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id qe4-20020a17090b4f8400b0019f663cfcd1so13634898pjb.1; Sun, 17 Oct 2021 22:05:20 -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=/KgrHMBG00+hza4vEi3Sk5N+IhB5EN8dqeg+sPQiG6I=; b=pzPqaClK6ufzAvRjvqqGVvNodlH+jFduWTq3rrLMyo1Yfv9N+HKZnyTtipSk7tEnu7 7p/L4vQDzml6066nVC1pkb2uKk+317ERWxHfeVRE3DYWOeM7NlbcQAp0HI9WsgL0x8JK eMJ5taQ82xnJsE/jVfvyazB4R8Fjuo88XvQNExTyh8GynNjUtXkX/805ZTPrbjwvltTB upDOsxhJQ/SjMKt0eX/sPtR5hNH5XL78mxVAHRYKFgBsEx8IaMTPVVl9HFmsPpkdXwlA q2xFIvP0gLA3tr8fGGL4H6ZnhzRQJ/ggz1K3ESxP2nPaHCiZiVXhIx52nkRnmc8nBg7D 9TIw== 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=/KgrHMBG00+hza4vEi3Sk5N+IhB5EN8dqeg+sPQiG6I=; b=eFEJyZyswX3OFXRl1DzB79szVxYf/y9qL5F3J+P91x2Q+57okCW3salkcxFBrCEq8I REl9JrgNRpWzx2aA3HAQPWQs/Or/z7hgaXSkmK5ThHDaCZIYzF5oUKqVTWBcRgp4Kw1R 1rjS59HwVR1vyampr1wM5mlpWUzBaQgE4UDvmlmOZMNf6phyuLR2HG/yWfCaNlHxgQP+ 44D2jsbBylbdGKBeCNc62VpSlHz1nlYEuWd6fFxVc+ANwSF+4K0+WjCOpw8F+csiVOlw G1w2ybwf9+O4wRYItmgNLHG3yrTfjzthSWUVWOvJRh1hFS2nGUeMs6amnHlPucRrmi/P hyZw== X-Gm-Message-State: AOAM5307MQCvu12RCgq9X8PO8MLt1Qepf+6aFHUhPweu8a+/80tIfc5T /Y2f7gga+/6DbhvOlcNp9+0= X-Google-Smtp-Source: ABdhPJz/mImGiCkwikDmckDe5cBvFzhIYC2QZquvZMhrF13R4qnXEjlRrntbc5i8TeX5qn5A1bcf0A== X-Received: by 2002:a17:902:e353:b0:13f:3276:a9d8 with SMTP id p19-20020a170902e35300b0013f3276a9d8mr25215762plc.81.1634533520585; Sun, 17 Oct 2021 22:05:20 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([137.59.103.165]) by smtp.gmail.com with ESMTPSA id c205sm11416625pfc.43.2021.10.17.22.05.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 17 Oct 2021 22:05:20 -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 v5 05/10] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform Date: Mon, 18 Oct 2021 13:04:43 +0800 Message-Id: <1634533488-25334-6-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1634533488-25334-1-git-send-email-dillon.minfei@gmail.com> References: <1634533488-25334-1-git-send-email-dillon.minfei@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-clk@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 --- v5: 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 *