{"id":13302,"url":"https://patchwork.libcamera.org/api/patches/13302/?format=json","web_url":"https://patchwork.libcamera.org/patch/13302/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20210811124015.2116188-2-hiroh@chromium.org>","date":"2021-08-11T12:40:11","name":"[libcamera-devel,RFC,1/5] libcamera: mapped_framebuffer: Return plane begin address by MappedBuffer::maps()","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"f15b67f8d065a9e572e258b76ad4b58768b5093f","submitter":{"id":63,"url":"https://patchwork.libcamera.org/api/people/63/?format=json","name":"Hirokazu Honda","email":"hiroh@chromium.org"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/13302/mbox/","series":[{"id":2339,"url":"https://patchwork.libcamera.org/api/series/2339/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2339","date":"2021-08-11T12:40:10","name":"MappedFrameBuffer::maps() returns the plane address","version":1,"mbox":"https://patchwork.libcamera.org/series/2339/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/13302/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/13302/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id D18EFBD87D\n\tfor ;\n\tWed, 11 Aug 2021 12:40:27 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 8233E68889;\n\tWed, 11 Aug 2021 14:40:27 +0200 (CEST)","from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com\n\t[IPv6:2607:f8b0:4864:20::1033])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5BD1568887\n\tfor ;\n\tWed, 11 Aug 2021 14:40:26 +0200 (CEST)","by mail-pj1-x1033.google.com with SMTP id\n\tmq2-20020a17090b3802b0290178911d298bso4625321pjb.1\n\tfor ;\n\tWed, 11 Aug 2021 05:40:26 -0700 (PDT)","from hiroh2.tok.corp.google.com\n\t([2401:fa00:8f:203:ba11:c25e:242c:485d])\n\tby smtp.gmail.com with ESMTPSA id\n\tp30sm15722876pfh.116.2021.08.11.05.40.23\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tWed, 11 Aug 2021 05:40:24 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=chromium.org header.i=@chromium.org\n\theader.b=\"hd6C0FON\"; 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\n\tWed, 11 Aug 2021 05:40:24 -0700 (PDT)","From":"Hirokazu Honda ","To":"libcamera-devel@lists.libcamera.org","Date":"Wed, 11 Aug 2021 21:40:11 +0900","Message-Id":"<20210811124015.2116188-2-hiroh@chromium.org>","X-Mailer":"git-send-email 2.32.0.605.g8dce9f2422-goog","In-Reply-To":"<20210811124015.2116188-1-hiroh@chromium.org>","References":"<20210811124015.2116188-1-hiroh@chromium.org>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [RFC PATCH 1/5] libcamera: mapped_framebuffer:\n\tReturn plane begin address by MappedBuffer::maps()","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"MappedBuffer::maps() returns std::vector.\nPlane has the address, but the address points the beginning of the\nbuffer containing the plane.\nThis makes the Plane point the beginning of the plane. So\nMappedBuffer::maps()[i].data() returns the address of i-th plane.\n\nSigned-off-by: Hirokazu Honda \n---\n .../libcamera/internal/mapped_framebuffer.h | 4 +-\n src/libcamera/mapped_framebuffer.cpp | 59 +++++++++++++++----\n 2 files changed, 52 insertions(+), 11 deletions(-)","diff":"diff --git a/include/libcamera/internal/mapped_framebuffer.h b/include/libcamera/internal/mapped_framebuffer.h\nindex 3401a9fc..42479541 100644\n--- a/include/libcamera/internal/mapped_framebuffer.h\n+++ b/include/libcamera/internal/mapped_framebuffer.h\n@@ -30,12 +30,14 @@ public:\n \n \tbool isValid() const { return error_ == 0; }\n \tint error() const { return error_; }\n-\tconst std::vector &maps() const { return maps_; }\n+\t/* \\todo rename to planes(). */\n+\tconst std::vector &maps() const { return planes_; }\n \n protected:\n \tMappedBuffer();\n \n \tint error_;\n+\tstd::vector planes_;\n \tstd::vector maps_;\n \n private:\ndiff --git a/src/libcamera/mapped_framebuffer.cpp b/src/libcamera/mapped_framebuffer.cpp\nindex 2ebe9fdb..5d5b02f1 100644\n--- a/src/libcamera/mapped_framebuffer.cpp\n+++ b/src/libcamera/mapped_framebuffer.cpp\n@@ -9,6 +9,7 @@\n \n #include \n #include \n+#include \n \n #include \n \n@@ -79,6 +80,7 @@ MappedBuffer::MappedBuffer(MappedBuffer &&other)\n MappedBuffer &MappedBuffer::operator=(MappedBuffer &&other)\n {\n \terror_ = other.error_;\n+\tplanes_ = std::move(other.planes_);\n \tmaps_ = std::move(other.maps_);\n \tother.error_ = -ENOENT;\n \n@@ -127,10 +129,18 @@ MappedBuffer::~MappedBuffer()\n */\n \n /**\n- * \\var MappedBuffer::maps_\n+ * \\var MappedBuffer::planes_\n * \\brief Stores the internal mapped planes\n *\n * MappedBuffer derived classes shall store the mappings they create in this\n+ * vector which points the beginning of mapped plane addresses.\n+ */\n+\n+/**\n+ * \\var MappedBuffer::maps_\n+ * \\brief Stores the mapped buffer\n+ *\n+ * MappedBuffer derived classes shall store the mappings they create in this\n * vector which is parsed during destruct to unmap any memory mappings which\n * completed successfully.\n */\n@@ -167,7 +177,8 @@ MappedBuffer::~MappedBuffer()\n */\n MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags)\n {\n-\tmaps_.reserve(buffer->planes().size());\n+\tASSERT(!buffer->planes().empty());\n+\tplanes_.reserve(buffer->planes().size());\n \n \tint mmapFlags = 0;\n \n@@ -177,18 +188,46 @@ MappedFrameBuffer::MappedFrameBuffer(const FrameBuffer *buffer, MapFlags flags)\n \tif (flags & MapFlag::Write)\n \t\tmmapFlags |= PROT_WRITE;\n \n+\tsize_t offset = 0;\n+\tint prevFd = -1;\n \tfor (const FrameBuffer::Plane &plane : buffer->planes()) {\n-\t\tvoid *address = mmap(nullptr, plane.length, mmapFlags,\n-\t\t\t\t MAP_SHARED, plane.fd.fd(), 0);\n-\t\tif (address == MAP_FAILED) {\n-\t\t\terror_ = -errno;\n-\t\t\tLOG(Buffer, Error) << \"Failed to mmap plane: \"\n-\t\t\t\t\t << strerror(-error_);\n-\t\t\tbreak;\n+\t\tconst int fd = plane.fd.fd();\n+\t\tif (prevFd != fd) {\n+\t\t\tconst size_t length = lseek(fd, 0, SEEK_END);\n+\t\t\tvoid *address = mmap(nullptr, length, mmapFlags,\n+\t\t\t\t\t MAP_SHARED, fd, 0);\n+\t\t\tif (address == MAP_FAILED) {\n+\t\t\t\terror_ = -errno;\n+\t\t\t\tLOG(Buffer, Error) << \"Failed to mmap plane: \"\n+\t\t\t\t\t\t << strerror(-error_);\n+\t\t\t\tbreak;\n+\t\t\t}\n+\t\t\tmaps_.emplace_back(static_cast(address),\n+\t\t\t\t\t length);\n+\t\t\tprevFd = fd;\n \t\t}\n \n-\t\tmaps_.emplace_back(static_cast(address), plane.length);\n+\t\tASSERT(!maps_.empty());\n+\t\tuint8_t *buf = maps_.back().data();\n+\t\tconst size_t length = maps_.back().size();\n+\n+\t\t/*\n+\t\t * This offset calculation assumes planes are consecutive.\n+\t\t * \\todo remove this assumption once offset is introduced to\n+\t\t * FrameBuffer::Plane.\n+\t\t */\n+\t\tplanes_.emplace_back(buf + offset, plane.length);\n+\t\toffset += plane.length;\n+\n+\t\tif (offset > length) {\n+\t\t\tLOG(Buffer, Fatal)\n+\t\t\t\t<< \"plane length is too large: plane lengths=\"\n+\t\t\t\t<< offset << \", buffer length=\" << length;\n+\t\t\tbreak;\n+\t\t}\n \t}\n+\n+\tASSERT(maps_.size() == 1);\n }\n \n } /* namespace libcamera */\n","prefixes":["libcamera-devel","RFC","1/5"]}