From patchwork Fri Jan 26 11:01:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Gaignard X-Patchwork-Id: 767925 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FB16134B4; Fri, 26 Jan 2024 11:01:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.227.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706266911; cv=none; b=uviSBpzHJA+4e8TNKVvgn1oxOuJBMI0D9QfSDOeShts1tBOxrkGSpPy6k/+kpDSmqkJeqwhgCA4lNyApf6LMIqAiybrqBzXCpsoncdtkgxeYAXJe1newEctSw8L30M+GDRM3a18GLnqtlJQ2cfzsTCjjfQDqHDT0rqIh0QRJXyk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706266911; c=relaxed/simple; bh=rxonFy/xXtVsAa0j3VVLg0HDonl2D7ONJZ+FYLpKkqo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ATOi/fTY8k2P6tFWVb9O6emmsa5VGMMC2+NvEmE25Pn1bfje3HXCQC2q6fbXH9+OgsJerbry2Em6Io9Hy6GV6O24Wq2pfdhBYR4cAG3xJrE8V9bU25cBJ4H76r14TFzqfnkUCmilLFLDtan+GpIhd/c+zNL2pDHLYAxDB8K6IOQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=1A/chmW/; arc=none smtp.client-ip=46.235.227.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="1A/chmW/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1706266908; bh=rxonFy/xXtVsAa0j3VVLg0HDonl2D7ONJZ+FYLpKkqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1A/chmW/4RbUhi7naBQWJJ9z9kf8G/PqQytw1fXdWw7Gme2LwMaYHKpnMYo6cuLvM 1Mq61ZLvvwGcmaTJ4bCTlSGXRJbjtM4OWIIbccauRghXxEbtKmZJWVLKGpOJjAr9p1 /EEo04eJFagZHT6K2CB7OzsMEac2tAHnSxRfsXlEtYiwcRj/jaO0fN/HXhcxqcRPSW VuxSWsVIUhGR05Q5JXGO0SOQwUBG2OGSfGOnWcAFulM5IAivg2VGeKC/usEOu4Fmxb CvRyUBVmmcQNfcmMEnKwlvn+h4oNYzM2Cv41NH0QlqyPEHBy0og5fhSJUNc7Q+2z+D HeozAedOiTKPw== Received: from benjamin-XPS-13-9310.. (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: benjamin.gaignard) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 976843782076; Fri, 26 Jan 2024 11:01:47 +0000 (UTC) From: Benjamin Gaignard To: hverkuil@xs4all.nl, mchehab@kernel.org Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, kernel@collabora.com, Benjamin Gaignard Subject: [PATCH v18 2/9] videobuf2: Add min_reqbufs_allocation field to vb2_queue structure Date: Fri, 26 Jan 2024 12:01:34 +0100 Message-Id: <20240126110141.135896-3-benjamin.gaignard@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240126110141.135896-1-benjamin.gaignard@collabora.com> References: <20240126110141.135896-1-benjamin.gaignard@collabora.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add 'min_reqbufs_allocation' field in the vb2_queue structure so drivers can specify the minimum number of buffers to allocate when calling VIDIOC_REQBUFS. When initializing the queue, v4l2 core makes sure that the following constraints are respected: - the minimum number of buffers to allocate must be at least 2 because one buffer is used by the hardware while the other is being processed by userspace. -if the driver needs 'min_queued_buffers' in the queue before calling start_streaming(), then the minimum requirement is 'min_queued_buffers + 1' to keep at least one buffer available for userspace. Simplify __vb2_init_fileio() by using 'min_reqbufs_allocation' directly to avoid duplicating the minimum number of buffers to allocate computation. Signed-off-by: Benjamin Gaignard --- .../media/common/videobuf2/videobuf2-core.c | 38 +++++++++++-------- include/media/videobuf2-core.h | 15 +++++++- 2 files changed, 37 insertions(+), 16 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 8aa6057df581..85a56b7fcd4a 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -867,7 +867,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, /* * Make sure the requested values and current defaults are sane. */ - num_buffers = max_t(unsigned int, *count, q->min_queued_buffers); + num_buffers = max_t(unsigned int, *count, q->min_reqbufs_allocation); num_buffers = min_t(unsigned int, num_buffers, q->max_num_buffers); memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); /* @@ -919,7 +919,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, * There is no point in continuing if we can't allocate the minimum * number of buffers needed by this vb2_queue. */ - if (allocated_buffers < q->min_queued_buffers) + if (allocated_buffers < q->min_reqbufs_allocation) ret = -ENOMEM; /* @@ -2525,6 +2525,25 @@ int vb2_core_queue_init(struct vb2_queue *q) if (WARN_ON(q->supports_requests && q->min_queued_buffers)) return -EINVAL; + /* + * The minimum requirement is 2: one buffer is used + * by the hardware while the other is being processed by userspace. + */ + if (q->min_reqbufs_allocation < 2) + q->min_reqbufs_allocation = 2; + + /* + * If the driver needs 'min_queued_buffers' in the queue before + * calling start_streaming() then the minimum requirement is + * 'min_queued_buffers + 1' to keep at least one buffer available + * for userspace. + */ + if (q->min_reqbufs_allocation < q->min_queued_buffers + 1) + q->min_reqbufs_allocation = q->min_queued_buffers + 1; + + if (WARN_ON(q->min_reqbufs_allocation > q->max_num_buffers)) + return -EINVAL; + INIT_LIST_HEAD(&q->queued_list); INIT_LIST_HEAD(&q->done_list); spin_lock_init(&q->done_lock); @@ -2717,7 +2736,6 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) struct vb2_fileio_data *fileio; struct vb2_buffer *vb; int i, ret; - unsigned int count = 0; /* * Sanity check @@ -2738,18 +2756,8 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) if (q->streaming || vb2_get_num_buffers(q) > 0) return -EBUSY; - /* - * Start with q->min_queued_buffers + 1, driver can increase it in - * queue_setup() - * - * 'min_queued_buffers' buffers need to be queued up before you - * can start streaming, plus 1 for userspace (or in this case, - * kernelspace) processing. - */ - count = max(2, q->min_queued_buffers + 1); - dprintk(q, 3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", - (read) ? "read" : "write", count, q->fileio_read_once, + (read) ? "read" : "write", q->min_reqbufs_allocation, q->fileio_read_once, q->fileio_write_immediately); fileio = kzalloc(sizeof(*fileio), GFP_KERNEL); @@ -2763,7 +2771,7 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) * Request buffers and use MMAP type to force driver * to allocate buffers by itself. */ - fileio->count = count; + fileio->count = q->min_reqbufs_allocation; fileio->memory = VB2_MEMORY_MMAP; fileio->type = q->type; q->fileio = fileio; diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index b317286a7b08..ef5500d14c09 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -550,9 +550,21 @@ struct vb2_buf_ops { * @start_streaming can be called. Used when a DMA engine * cannot be started unless at least this number of buffers * have been queued into the driver. - * VIDIOC_REQBUFS will ensure at least @min_queued_buffers + * VIDIOC_REQBUFS will ensure at least @min_queued_buffers + 1 * buffers will be allocated. Note that VIDIOC_CREATE_BUFS will not * modify the requested buffer count. + * @min_reqbufs_allocation: the minimum number of buffers to be allocated when + * calling VIDIOC_REQBUFS. Note that VIDIOC_CREATE_BUFS will *not* + * modify the requested buffer count and does not use this field. + * Drivers can set this if there has to be a certain number of + * buffers available for the hardware to work effectively. + * This allows calling VIDIOC_REQBUFS with a buffer count of 1 and + * it will be automatically adjusted to a workable buffer count. + * If set, then @min_reqbufs_allocation must be larger than + * @min_queued_buffers + 1. + * If this field is > 3, then it is highly recommended that the + * driver implements the V4L2_CID_MIN_BUFFERS_FOR_CAPTURE/OUTPUT + * control. */ /* * Private elements (won't appear at the uAPI book): @@ -619,6 +631,7 @@ struct vb2_queue { u32 timestamp_flags; gfp_t gfp_flags; u32 min_queued_buffers; + u32 min_reqbufs_allocation; struct device *alloc_devs[VB2_MAX_PLANES];