From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF073C352BE for ; Tue, 14 Apr 2020 23:36:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAACF2074D for ; Tue, 14 Apr 2020 23:36:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="NZr41JCR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731547AbgDNXg5 (ORCPT ); Tue, 14 Apr 2020 19:36:57 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:38980 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731535AbgDNXg4 (ORCPT ); Tue, 14 Apr 2020 19:36:56 -0400 Received: from pendragon.ideasonboard.com (81-175-216-236.bb.dnainternet.fi [81.175.216.236]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2D609521; Wed, 15 Apr 2020 01:36:53 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1586907413; bh=410pistxrVxeYxDba6MRkc8SnbOI4K3P4RTAVulbulQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NZr41JCRKFqVSj9IzZrF60dei/OyLv+ishIS51M7rVZgXyWjErU1/N8TQlXLQfyRz NQ5MU6eSjE9zNGwpPqpI7/y2xsHEQVe6u9aKfR2QF8nunFUliq1Bmf/hIHvTKVsQhk W4qhIqZrxw8zTWR2WYs+f9f+WDHtbEnAYt3i3IGE= Date: Wed, 15 Apr 2020 02:36:41 +0300 From: Laurent Pinchart To: Hans Verkuil Cc: Niklas =?utf-8?Q?S=C3=B6derlund?= , Helen Koike , Sakari Ailus , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH v7 1/6] v4l2-dev/ioctl: Add V4L2_CAP_IO_MC Message-ID: <20200414233641.GU19819@pendragon.ideasonboard.com> References: <20200413202351.1359754-1-niklas.soderlund+renesas@ragnatech.se> <20200413202351.1359754-2-niklas.soderlund+renesas@ragnatech.se> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hi Hans, On Tue, Apr 14, 2020 at 01:42:46PM +0200, Hans Verkuil wrote: > On 13/04/2020 22:23, Niklas Söderlund wrote: > > Add a video device capability flag to indicate that its inputs and/or > > outputs are controlled by the Media Controller instead of the V4L2 API. > > When this flag is set, ioctl for enum inputs and outputs are > > automatically enabled and programmed to call a helper function. > > > > Suggested-by: Hans Verkuil > > Signed-off-by: Helen Koike > > Signed-off-by: Niklas Söderlund > > Acked-by: Sakari Ailus > > Reviewed-by: Laurent Pinchart > > --- > > .../media/uapi/v4l/vidioc-querycap.rst | 6 ++ > > .../media/videodev2.h.rst.exceptions | 1 + > > drivers/media/v4l2-core/v4l2-dev.c | 25 ++++++-- > > drivers/media/v4l2-core/v4l2-ioctl.c | 57 +++++++++++++++++-- > > include/uapi/linux/videodev2.h | 2 + > > 5 files changed, 81 insertions(+), 10 deletions(-) > > > > diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst > > index 5f9930195d624c73..497a6aa2cbebad71 100644 > > --- a/Documentation/media/uapi/v4l/vidioc-querycap.rst > > +++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst > > @@ -264,6 +264,12 @@ specification the ioctl returns an ``EINVAL`` error code. > > * - ``V4L2_CAP_TOUCH`` > > - 0x10000000 > > - This is a touch device. > > + * - ``V4L2_CAP_IO_MC`` > > + - 0x20000000 > > + - There is only one input and/or output seen from userspace. The whole > > + video topology configuration, including which I/O entity is routed to > > + the input/output, is configured by userspace via the Media Controller. > > + See :ref:`media_controller`. > > * - ``V4L2_CAP_DEVICE_CAPS`` > > - 0x80000000 > > - The driver fills the ``device_caps`` field. This capability can > > diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions > > index cb6ccf91776e6b56..a625fb90e3a989a7 100644 > > --- a/Documentation/media/videodev2.h.rst.exceptions > > +++ b/Documentation/media/videodev2.h.rst.exceptions > > @@ -176,6 +176,7 @@ replace define V4L2_CAP_STREAMING device-capabilities > > replace define V4L2_CAP_META_OUTPUT device-capabilities > > replace define V4L2_CAP_DEVICE_CAPS device-capabilities > > replace define V4L2_CAP_TOUCH device-capabilities > > +replace define V4L2_CAP_IO_MC device-capabilities > > > > # V4L2 pix flags > > replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format` > > diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c > > index 97b6a3af13614639..3048811450182185 100644 > > --- a/drivers/media/v4l2-core/v4l2-dev.c > > +++ b/drivers/media/v4l2-core/v4l2-dev.c > > @@ -552,6 +552,7 @@ static void determine_valid_ioctls(struct video_device *vdev) > > (vdev->device_caps & meta_caps); > > bool is_rx = vdev->vfl_dir != VFL_DIR_TX; > > bool is_tx = vdev->vfl_dir != VFL_DIR_RX; > > + bool is_io_mc = vdev->device_caps & V4L2_CAP_IO_MC; > > > > bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE); > > > > @@ -725,9 +726,15 @@ static void determine_valid_ioctls(struct video_device *vdev) > > SET_VALID_IOCTL(ops, VIDIOC_G_STD, vidioc_g_std); > > if (is_rx) { > > SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd); > > - SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); > > - SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); > > - SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); > > + if (is_io_mc && !is_meta) { > > I noticed the addition of !is_meta. Digging into the history I saw that it was > a request from Sakari in the v4 review. I must have missed that since I disagree > with that change. > > If IO_MC is set, then this applies to video/meta/vbi. After all, vbi is just a > special kind of metadata (and we'd use a metadata device node if we would design > that today), so it makes no sense to do something different for metadata. > > Another issue here is that video devices can be for video, for metadata, or for > both. So if is_io_mc is true, then you would get different behavior depending > on the type of video device: if it is just video, then it supports the INPUT > ioctls, if it supports metadata as well, then it doesn't. As expressed before, I think we really should drop VIDIOC_ENUMINPUT, VIDIOC_G_INPUT and VIDIOC_S_INPUT for devices that have V4L2_CAP_IO_MC set. They can't be supported by generic video node-centric applications that expect those ioctls to be supported in any case, so it makes little sense. With V4L2_CAP_IO_MC added, the v4l2-compliance tool can ignore those ioctls (or, even better, report an error if they're implemented). > I would just keep this as it was originally: > > if (is_io_mc) { > > > + set_bit(_IOC_NR(VIDIOC_ENUMINPUT), valid_ioctls); > > + set_bit(_IOC_NR(VIDIOC_G_INPUT), valid_ioctls); > > + set_bit(_IOC_NR(VIDIOC_S_INPUT), valid_ioctls); > > + } else { > > + SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input); > > + SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input); > > + SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input); > > + } > > SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio); > > SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio); > > SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio); > > @@ -735,9 +742,15 @@ static void determine_valid_ioctls(struct video_device *vdev) > > SET_VALID_IOCTL(ops, VIDIOC_S_EDID, vidioc_s_edid); > > } > > if (is_tx) { > > - SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); > > - SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); > > - SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); > > + if (is_io_mc && !is_meta) { > > Same here. > > The remainder of the series looks good (except that an additional cx18 patch is > needed as Andrey pointed out on irc). > > > + set_bit(_IOC_NR(VIDIOC_ENUMOUTPUT), valid_ioctls); > > + set_bit(_IOC_NR(VIDIOC_G_OUTPUT), valid_ioctls); > > + set_bit(_IOC_NR(VIDIOC_S_OUTPUT), valid_ioctls); > > + } else { > > + SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output); > > + SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output); > > + SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output); > > + } > > SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout); > > SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout); > > SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout); > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > > index b2ef8e60ea7da19d..afd1f427df557f71 100644 > > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > > @@ -1085,6 +1085,32 @@ static int v4l_querycap(const struct v4l2_ioctl_ops *ops, > > return ret; > > } > > > > +static int v4l_g_input(const struct v4l2_ioctl_ops *ops, > > + struct file *file, void *fh, void *arg) > > +{ > > + struct video_device *vfd = video_devdata(file); > > + > > + if (vfd->device_caps & V4L2_CAP_IO_MC) { > > + *(int *)arg = 0; > > + return 0; > > + } > > + > > + return ops->vidioc_g_input(file, fh, arg); > > +} > > + > > +static int v4l_g_output(const struct v4l2_ioctl_ops *ops, > > + struct file *file, void *fh, void *arg) > > +{ > > + struct video_device *vfd = video_devdata(file); > > + > > + if (vfd->device_caps & V4L2_CAP_IO_MC) { > > + *(int *)arg = 0; > > + return 0; > > + } > > + > > + return ops->vidioc_g_output(file, fh, arg); > > +} > > + > > static int v4l_s_input(const struct v4l2_ioctl_ops *ops, > > struct file *file, void *fh, void *arg) > > { > > @@ -1094,12 +1120,21 @@ static int v4l_s_input(const struct v4l2_ioctl_ops *ops, > > ret = v4l_enable_media_source(vfd); > > if (ret) > > return ret; > > + > > + if (vfd->device_caps & V4L2_CAP_IO_MC) > > + return *(int *)arg ? -EINVAL : 0; > > + > > return ops->vidioc_s_input(file, fh, *(unsigned int *)arg); > > } > > > > static int v4l_s_output(const struct v4l2_ioctl_ops *ops, > > struct file *file, void *fh, void *arg) > > { > > + struct video_device *vfd = video_devdata(file); > > + > > + if (vfd->device_caps & V4L2_CAP_IO_MC) > > + return *(int *)arg ? -EINVAL : 0; > > + > > return ops->vidioc_s_output(file, fh, *(unsigned int *)arg); > > } > > > > @@ -1143,6 +1178,14 @@ static int v4l_enuminput(const struct v4l2_ioctl_ops *ops, > > if (is_valid_ioctl(vfd, VIDIOC_S_STD)) > > p->capabilities |= V4L2_IN_CAP_STD; > > > > + if (vfd->device_caps & V4L2_CAP_IO_MC) { > > + if (p->index) > > + return -EINVAL; > > + strscpy(p->name, vfd->name, sizeof(p->name)); > > + p->type = V4L2_INPUT_TYPE_CAMERA; > > + return 0; > > + } > > + > > return ops->vidioc_enum_input(file, fh, p); > > } > > > > @@ -1161,6 +1204,14 @@ static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops, > > if (is_valid_ioctl(vfd, VIDIOC_S_STD)) > > p->capabilities |= V4L2_OUT_CAP_STD; > > > > + if (vfd->device_caps & V4L2_CAP_IO_MC) { > > + if (p->index) > > + return -EINVAL; > > + strscpy(p->name, vfd->name, sizeof(p->name)); > > + p->type = V4L2_OUTPUT_TYPE_ANALOG; > > + return 0; > > + } > > + > > return ops->vidioc_enum_output(file, fh, p); > > } > > > > @@ -2683,10 +2734,8 @@ DEFINE_V4L_STUB_FUNC(expbuf) > > DEFINE_V4L_STUB_FUNC(g_std) > > DEFINE_V4L_STUB_FUNC(g_audio) > > DEFINE_V4L_STUB_FUNC(s_audio) > > -DEFINE_V4L_STUB_FUNC(g_input) > > DEFINE_V4L_STUB_FUNC(g_edid) > > DEFINE_V4L_STUB_FUNC(s_edid) > > -DEFINE_V4L_STUB_FUNC(g_output) > > DEFINE_V4L_STUB_FUNC(g_audout) > > DEFINE_V4L_STUB_FUNC(s_audout) > > DEFINE_V4L_STUB_FUNC(g_jpegcomp) > > @@ -2735,11 +2784,11 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = { > > IOCTL_INFO(VIDIOC_S_AUDIO, v4l_stub_s_audio, v4l_print_audio, INFO_FL_PRIO), > > IOCTL_INFO(VIDIOC_QUERYCTRL, v4l_queryctrl, v4l_print_queryctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_queryctrl, id)), > > IOCTL_INFO(VIDIOC_QUERYMENU, v4l_querymenu, v4l_print_querymenu, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_querymenu, index)), > > - IOCTL_INFO(VIDIOC_G_INPUT, v4l_stub_g_input, v4l_print_u32, 0), > > + IOCTL_INFO(VIDIOC_G_INPUT, v4l_g_input, v4l_print_u32, 0), > > IOCTL_INFO(VIDIOC_S_INPUT, v4l_s_input, v4l_print_u32, INFO_FL_PRIO), > > IOCTL_INFO(VIDIOC_G_EDID, v4l_stub_g_edid, v4l_print_edid, INFO_FL_ALWAYS_COPY), > > IOCTL_INFO(VIDIOC_S_EDID, v4l_stub_s_edid, v4l_print_edid, INFO_FL_PRIO | INFO_FL_ALWAYS_COPY), > > - IOCTL_INFO(VIDIOC_G_OUTPUT, v4l_stub_g_output, v4l_print_u32, 0), > > + IOCTL_INFO(VIDIOC_G_OUTPUT, v4l_g_output, v4l_print_u32, 0), > > IOCTL_INFO(VIDIOC_S_OUTPUT, v4l_s_output, v4l_print_u32, INFO_FL_PRIO), > > IOCTL_INFO(VIDIOC_ENUMOUTPUT, v4l_enumoutput, v4l_print_enumoutput, INFO_FL_CLEAR(v4l2_output, index)), > > IOCTL_INFO(VIDIOC_G_AUDOUT, v4l_stub_g_audout, v4l_print_audioout, 0), > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h > > index 9817b7e2c968fd04..b18f3f7cde31c2e4 100644 > > --- a/include/uapi/linux/videodev2.h > > +++ b/include/uapi/linux/videodev2.h > > @@ -487,6 +487,8 @@ struct v4l2_capability { > > > > #define V4L2_CAP_TOUCH 0x10000000 /* Is a touch device */ > > > > +#define V4L2_CAP_IO_MC 0x20000000 /* Is input/output controlled by the media controller */ > > + > > #define V4L2_CAP_DEVICE_CAPS 0x80000000 /* sets device capabilities field */ > > > > /* -- Regards, Laurent Pinchart