From patchwork Fri Jan 19 09:49:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Gaignard X-Patchwork-Id: 764997 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 00C8C3C693; Fri, 19 Jan 2024 09:49:52 +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=1705657794; cv=none; b=KWa/fIlvyMUaarumRX5V/wf9Dp2Zse9Qzf1ZIbc0Z9XSijM895sG6HC+buWG9uPvE4kMwpeYfR+XsdZAfQ9m8ZIarDEh8xwHw79LPGgPIor4ufq4gjrd3ioH7UaiQsZpOB08VCWVvCuZ7lGlpi2rOhHDv4qoagDy7KqbtKIeICg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705657794; c=relaxed/simple; bh=SfNHaMz/EWNiEqcLSKoUncdI3TZfa6CIrCQUBzs9qF4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kUSdISau1vsXxmNKAh4ZZ6JDf8IrctWCJLATiXJkpWa79gZnkMWQlsBoaCeXjyFSoAKrKNab6UY+0Xx8Ap+Fu0WbGxJQkjqlgv9dXTEOqwV84vvD2PmULtlQ2VZ2qmbvb98DijqMGhrTq5aPH0RIsVGkGoSzG+vttIe5FgCsiHY= 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=dErAVSkt; 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="dErAVSkt" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1705657791; bh=SfNHaMz/EWNiEqcLSKoUncdI3TZfa6CIrCQUBzs9qF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dErAVSkt3+LYjxfpPYlD9u1APsj/JJJufeFWYjoNN5BROSIFolO9WM1udvBHLyzDU uaqzBJGhi40JGJ+NY/6h+oftXB8A59QYjnyxHtBNPCty2w7UgxeUCo5i8tZvAlOxcY YUXKOmMxY8yXchM7KUgcgdsEFDYUyIo51mRaZoqEewFCkzMvkb5yB09dWiIoVdOM5j VPfmAsUvGjw6nUlKnD1e9p72brQv2jNVmcW5pbxiR2Fa7lJD5mx/ob/H1VzHE/PPBX N0Dzv/UT957f8znlPQ8nX74y9Zd4TnWcljXQdhx/8iGkzt2ymoJTYqNttLmTZ/HEnW pj0r+0BNG4VDw== 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 EC2733782081; Fri, 19 Jan 2024 09:49:50 +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 v17 1/8] videobuf2: Add min_reqbufs_allocation field to vb2_queue structure Date: Fri, 19 Jan 2024 10:49:37 +0100 Message-Id: <20240119094944.26763-2-benjamin.gaignard@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240119094944.26763-1-benjamin.gaignard@collabora.com> References: <20240119094944.26763-1-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 vb2_queue structure so drivers can specificy the minimum number of buffers to allocate when calling VIDIOC_REQBUFS. When initializing the queue, v4l2 core makes sure that the following constraint are respected: - minimum number of buffers to allocate should be at least 2 because one buffer is used by the hardware and other processed by userspace. - if a minimum number of buffers before start streaming is specify the minimum number of buffers to allocate should be min_queued_buffers + 1 to keep 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 --- version 17: - rewrite commit message. - simplify __vb2_init_fileio() code. - rewrite documentation .../media/common/videobuf2/videobuf2-core.c | 37 +++++++++++-------- include/media/videobuf2-core.h | 15 +++++++- 2 files changed, 36 insertions(+), 16 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index b6bf8f232f48..d74e93d00f58 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -865,7 +865,7 @@ 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)); /* @@ -917,7 +917,7 @@ 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; /* @@ -2521,6 +2521,24 @@ int vb2_core_queue_init(struct vb2_queue *q) if (WARN_ON(q->supports_requests && q->min_queued_buffers)) return -EINVAL; + /* + * The minimum requirement should really be 2: one buffer is used + * by the hardware and one other processed by userspace. + */ + if (q->min_reqbufs_allocation < 2) + q->min_reqbufs_allocation = 2; + + /* + * If the driver needs 'min_queued_buffers' before 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); @@ -2713,7 +2731,6 @@ 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 @@ -2734,18 +2751,8 @@ 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); @@ -2759,7 +2766,7 @@ 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 56719a26a46c..fe3423ff3807 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): @@ -618,6 +630,7 @@ 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];