{"id":14813,"url":"https://patchwork.libcamera.org/api/1.1/patches/14813/?format=json","web_url":"https://patchwork.libcamera.org/patch/14813/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/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":"<20211127192440.389551-1-vedantparanjape160201@gmail.com>","date":"2021-11-27T19:24:40","name":"[libcamera-devel] v4l2: V4L2CameraProxy: Add EXPBUF as one of the supported ioctl","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"208dffa8def65c86e735b4eb55e313e4e534cfed","submitter":{"id":85,"url":"https://patchwork.libcamera.org/api/1.1/people/85/?format=json","name":"Vedant Paranjape","email":"vedantparanjape160201@gmail.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/14813/mbox/","series":[{"id":2766,"url":"https://patchwork.libcamera.org/api/1.1/series/2766/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=2766","date":"2021-11-27T19:24:40","name":"[libcamera-devel] v4l2: V4L2CameraProxy: Add EXPBUF as one of the supported ioctl","version":1,"mbox":"https://patchwork.libcamera.org/series/2766/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/14813/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/14813/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 BE5DABF415\n\tfor ;\n\tSat, 27 Nov 2021 19:25:21 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D94316056A;\n\tSat, 27 Nov 2021 20:25:20 +0100 (CET)","from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com\n\t[IPv6:2607:f8b0:4864:20::102d])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id A2F166011E\n\tfor ;\n\tSat, 27 Nov 2021 20:25:19 +0100 (CET)","by mail-pj1-x102d.google.com with SMTP id\n\tp18-20020a17090ad31200b001a78bb52876so12117217pju.3\n\tfor ;\n\tSat, 27 Nov 2021 11:25:19 -0800 (PST)","from localhost.localdomain ([1.186.167.22])\n\tby smtp.googlemail.com with ESMTPSA id\n\tj13sm8141006pgg.5.2021.11.27.11.25.15\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tSat, 27 Nov 2021 11:25:17 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"ent7D934\"; 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\n\tSat, 27 Nov 2021 11:25:17 -0800 (PST)","From":"Vedant Paranjape ","To":"libcamera-devel@lists.libcamera.org","Date":"Sun, 28 Nov 2021 00:54:40 +0530","Message-Id":"<20211127192440.389551-1-vedantparanjape160201@gmail.com>","X-Mailer":"git-send-email 2.25.1","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH] v4l2: V4L2CameraProxy: Add EXPBUF as one\n\tof the supported ioctl","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","Cc":"Vedant Paranjape ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"To support DMABUF as one of the memory buffer, we need to implement\nEXPBUF in the v4l2 compat layer.\n\nThis patch implements vidioc_expbuf as one of the supported ioctls.\n\nReference issue: https://bugs.libcamera.org/show_bug.cgi?id=89\n\nSigned-off-by: Vedant Paranjape \n---\n src/v4l2/v4l2_camera_proxy.cpp | 41 +++++++++++++++++++++++++++++++++-\n src/v4l2/v4l2_camera_proxy.h | 1 +\n 2 files changed, 41 insertions(+), 1 deletion(-)","diff":"diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp\nindex 3610e63cade3..03e3564bfed5 100644\n--- a/src/v4l2/v4l2_camera_proxy.cpp\n+++ b/src/v4l2/v4l2_camera_proxy.cpp\n@@ -160,7 +160,8 @@ bool V4L2CameraProxy::validateBufferType(uint32_t type)\n \n bool V4L2CameraProxy::validateMemoryType(uint32_t memory)\n {\n-\treturn memory == V4L2_MEMORY_MMAP;\n+\treturn (memory == V4L2_MEMORY_MMAP) ||\n+\t\t\t(memory == V4L2_MEMORY_DMABUF);\n }\n \n void V4L2CameraProxy::setFmtFromConfig(const StreamConfiguration &streamConfig)\n@@ -624,6 +625,40 @@ int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,\n \treturn 0;\n }\n \n+int V4L2CameraProxy::vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg)\n+{\n+\tLOG(V4L2Compat, Debug) << \"Servicing vidioc_expbuf fd = \" << file->efd();\n+\t/* \\todo Verify that the memory type is MMAP when adding DMABUF support */\n+\tif (!validateBufferType(arg->type))\n+\t\treturn -EINVAL;\n+\n+\tif (arg->index >= bufferCount_)\n+\t\treturn -EINVAL;\n+\n+\tif (arg->flags & ~(O_CLOEXEC | O_ACCMODE))\n+\t\treturn -EINVAL;\n+\n+\tLOG(V4L2Compat, Debug) << arg->index << \" : index of the buffer\";\n+\n+\tif (file->priority() < maxPriority())\n+\t\treturn -EBUSY;\n+\n+\tif (!hasOwnership(file) && owner_)\n+\t\treturn -EBUSY;\n+\n+\tmemset(arg->reserved, 0, sizeof(arg->reserved));\n+\n+\targ->fd = fcntl(buffers_[arg->index].m.fd,\n+\t\t\targ->flags & O_CLOEXEC ? F_DUPFD_CLOEXEC : F_DUPFD, 0);\n+\targ->fd = fcntl(arg->fd, F_SETFL, 0);\n+\n+\tLOG(V4L2Compat, Debug) << \"Exported buffer at index: \" << arg->index;\n+\n+\tacquire(file);\n+\n+\treturn 0;\n+}\n+\n int V4L2CameraProxy::vidioc_streamon(V4L2CameraFile *file, int *arg)\n {\n \tLOG(V4L2Compat, Debug) << \"Servicing vidioc_streamon fd = \" << file->efd();\n@@ -685,6 +720,7 @@ const std::set V4L2CameraProxy::supportedIoctls_ = {\n \tVIDIOC_QUERYBUF,\n \tVIDIOC_QBUF,\n \tVIDIOC_DQBUF,\n+\tVIDIOC_EXPBUF,\n \tVIDIOC_STREAMON,\n \tVIDIOC_STREAMOFF,\n };\n@@ -755,6 +791,9 @@ int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *ar\n \tcase VIDIOC_DQBUF:\n \t\tret = vidioc_dqbuf(file, static_cast(arg), &locker);\n \t\tbreak;\n+\tcase VIDIOC_EXPBUF:\n+\t\tret = vidioc_expbuf(file, static_cast(arg));\n+\t\tbreak;\n \tcase VIDIOC_STREAMON:\n \t\tret = vidioc_streamon(file, static_cast(arg));\n \t\tbreak;\ndiff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h\nindex fccec241879d..81ef7788e9fe 100644\n--- a/src/v4l2/v4l2_camera_proxy.h\n+++ b/src/v4l2/v4l2_camera_proxy.h\n@@ -58,6 +58,7 @@ private:\n \tint vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);\n \tint vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,\n \t\t\t libcamera::MutexLocker *locker);\n+\tint vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg);\n \tint vidioc_streamon(V4L2CameraFile *file, int *arg);\n \tint vidioc_streamoff(V4L2CameraFile *file, int *arg);\n \n","prefixes":["libcamera-devel"]}