From nobody Fri Sep 20 11:28:12 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64B93E784BB for ; Mon, 2 Oct 2023 12:07:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237219AbjJBMHU (ORCPT ); Mon, 2 Oct 2023 08:07:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237018AbjJBMGf (ORCPT ); Mon, 2 Oct 2023 08:06:35 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA406D7; Mon, 2 Oct 2023 05:06:32 -0700 (PDT) Received: from benjamin-XPS-13-9310.. (unknown [IPv6:2a01:e0a:120:3210:9537:67ca:c85e:d0ae]) (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 madras.collabora.co.uk (Postfix) with ESMTPSA id 5EEB26607334; Mon, 2 Oct 2023 13:06:31 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1696248391; bh=LamHPpgiOIWh6DTy0PrTueIlE19Fe0d1QhlJSM4GvGk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VlQQAI0Tz0U55KP+2uOlbnYt9eTF4THK2s5T72E2JH3FHmsPchmN0AaBc6WjiOQBD C7ogo0hkajkLaUYjhWbXbngdOHk9RVVroY30sSyiLCGHfD0SY+ujWHLKPAXMs3NSMB uahv1jvFXwWPLoUzGwz8vEXzQlWEQSgugaO5ozwkflLWdXQa/eLkz9+HWV8MgvJvs1 4gXu6bYX6nJ3z+1yH8NzVg/LQWIdSO6U6QTDlBMPpDrwfRvuBpmwaZSNdNcXK+fWzb lOZfAYF3xNB2Svp/J6AmWr2ENefHC+I7OYF2ijyJNMXQ1A/6BJlNPbqvKLZlJmNq9+ bnMsus9yrIRow== From: Benjamin Gaignard To: mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com, ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar, p.zabel@pengutronix.de, gregkh@linuxfoundation.org, hverkuil-cisco@xs4all.nl, nicolas.dufresne@collabora.com Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev, kernel@collabora.com, Benjamin Gaignard Subject: [PATCH v9 13/53] media: Report the maximum possible number of buffers for the queue Date: Mon, 2 Oct 2023 14:05:37 +0200 Message-Id: <20231002120617.119602-14-benjamin.gaignard@collabora.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231002120617.119602-1-benjamin.gaignard@collabora.com> References: <20231002120617.119602-1-benjamin.gaignard@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use one of the struct v4l2_create_buffers reserved bytes to report the maximum possible number of buffers for the queue. V4l2 framework set V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS flags in queue capabilities so userland can know when the field is valid. Signed-off-by: Benjamin Gaignard --- .../userspace-api/media/v4l/vidioc-create-bufs.rst | 8 ++++++-- Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst | 1 + drivers/media/common/videobuf2/videobuf2-v4l2.c | 6 +++++- drivers/media/v4l2-core/v4l2-ioctl.c | 4 ++-- include/uapi/linux/videodev2.h | 7 ++++++- 5 files changed, 20 insertions(+), 6 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst b= /Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst index a048a9f6b7b6..1a46549e7462 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst @@ -116,9 +116,13 @@ than the number requested. - ``flags`` - Specifies additional buffer management attributes. See :ref:`memory-flags`. - * - __u32 - - ``reserved``\ [6] + - ``max_buffers`` + - If V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS capability flag is set + this field indicate the maximum possible number of buffers + for this queue. + * - __u32 + - ``reserved``\ [5] - A place holder for future extensions. Drivers and applications must set the array to zero. =20 diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Doc= umentation/userspace-api/media/v4l/vidioc-reqbufs.rst index 099fa6695167..0395187e1a5a 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst @@ -120,6 +120,7 @@ aborting or finishing any DMA in progress, an implicit .. _V4L2-BUF-CAP-SUPPORTS-ORPHANED-BUFS: .. _V4L2-BUF-CAP-SUPPORTS-M2M-HOLD-CAPTURE-BUF: .. _V4L2-BUF-CAP-SUPPORTS-MMAP-CACHE-HINTS: +.. _V4L2-BUF-CAP-SUPPORTS-SET-MAX-BUFS: =20 .. raw:: latex =20 diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/medi= a/common/videobuf2/videobuf2-v4l2.c index 278ea1107b01..51b16cd14582 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -686,6 +686,7 @@ EXPORT_SYMBOL(vb2_querybuf); static void fill_buf_caps(struct vb2_queue *q, u32 *caps) { *caps =3D V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; + *caps |=3D V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS; if (q->io_modes & VB2_MMAP) *caps |=3D V4L2_BUF_CAP_SUPPORTS_MMAP; if (q->io_modes & VB2_USERPTR) @@ -767,7 +768,10 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_c= reate_buffers *create) =20 fill_buf_caps(q, &create->capabilities); validate_memory_flags(q, create->memory, &create->flags); - create->index =3D q->num_buffers; + + create->max_buffers =3D q->max_num_buffers; + create->index =3D vb2_get_num_buffers(q); + if (create->count =3D=3D 0) return ret !=3D -EBUSY ? ret : 0; =20 diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core= /v4l2-ioctl.c index f4d9d6279094..700db197e371 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -483,9 +483,9 @@ static void v4l_print_create_buffers(const void *arg, b= ool write_only) { const struct v4l2_create_buffers *p =3D arg; =20 - pr_cont("index=3D%d, count=3D%d, memory=3D%s, capabilities=3D0x%08x, ", + pr_cont("index=3D%d, count=3D%d, memory=3D%s, capabilities=3D0x%08x, max = buffers=3D%u", p->index, p->count, prt_names(p->memory, v4l2_memory_names), - p->capabilities); + p->capabilities, p->max_buffers); v4l_print_format(&p->format, write_only); } =20 diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 78260e5d9985..b0dbb1be728c 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -1034,6 +1034,7 @@ struct v4l2_requestbuffers { #define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS (1 << 4) #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF (1 << 5) #define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS (1 << 6) +#define V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS (1 << 7) =20 /** * struct v4l2_plane - plane info for multi-planar buffers @@ -2604,6 +2605,9 @@ struct v4l2_dbg_chip_info { * @flags: additional buffer management attributes (ignored unless the * queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability * and configured for MMAP streaming I/O). + * @max_buffers: if V4L2_BUF_CAP_SUPPORTS_SET_MAX_BUFS capability flag is = set + * this field indicate the maximum possible number of buffers + * for this queue. * @reserved: future extensions */ struct v4l2_create_buffers { @@ -2613,7 +2617,8 @@ struct v4l2_create_buffers { struct v4l2_format format; __u32 capabilities; __u32 flags; - __u32 reserved[6]; + __u32 max_buffers; + __u32 reserved[5]; }; =20 /* --=20 2.39.2