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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBE45C433F5 for ; Mon, 3 Oct 2022 14:26:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229918AbiJCO0l (ORCPT ); Mon, 3 Oct 2022 10:26:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229441AbiJCO0j (ORCPT ); Mon, 3 Oct 2022 10:26:39 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B63352478 for ; Mon, 3 Oct 2022 07:26:37 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C787561084 for ; Mon, 3 Oct 2022 14:26:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D7A7C433D6; Mon, 3 Oct 2022 14:26:33 +0000 (UTC) Message-ID: <7b56d565-5358-67be-84b8-101a97f97f2b@xs4all.nl> Date: Mon, 3 Oct 2022 16:26:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: [PATCH v15 05/19] media: subdev: Add [GS]_ROUTING subdev ioctls and operations Content-Language: en-US To: Tomi Valkeinen , linux-media@vger.kernel.org, sakari.ailus@linux.intel.com, Jacopo Mondi , Laurent Pinchart , niklas.soderlund+renesas@ragnatech.se, Mauro Carvalho Chehab , Kishon Vijay Abraham , satish.nagireddy@getcruise.com, Tomasz Figa Cc: Michal Simek References: <20221003121852.616745-1-tomi.valkeinen@ideasonboard.com> <20221003121852.616745-6-tomi.valkeinen@ideasonboard.com> From: Hans Verkuil In-Reply-To: <20221003121852.616745-6-tomi.valkeinen@ideasonboard.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hi Tomi, On 10/3/22 14:18, Tomi Valkeinen wrote: > From: Laurent Pinchart > > Add support for subdev internal routing. A route is defined as a single > stream from a sink pad to a source pad. > > The userspace can configure the routing via two new ioctls, > VIDIOC_SUBDEV_G_ROUTING and VIDIOC_SUBDEV_S_ROUTING, and subdevs can > implement the functionality with v4l2_subdev_pad_ops.set_routing(). > > Signed-off-by: Laurent Pinchart > Signed-off-by: Michal Simek > > - Add sink and source streams for multiplexed links > - Copy the argument back in case of an error. This is needed to let the > caller know the number of routes. > > Signed-off-by: Sakari Ailus > > - Expand and refine documentation. > - Make the 'routes' pointer a __u64 __user pointer so that a compat32 > version of the ioctl is not required. > - Add struct v4l2_subdev_krouting to be used for subdevice operations. > > Signed-off-by: Jacopo Mondi > > - Fix typecasing warnings > - Check sink & source pad types > - Add 'which' field > - Add V4L2_SUBDEV_ROUTE_FL_SOURCE > - Routing to subdev state > - Dropped get_routing subdev op > > Signed-off-by: Tomi Valkeinen > --- > drivers/media/v4l2-core/v4l2-ioctl.c | 25 +++++++- > drivers/media/v4l2-core/v4l2-subdev.c | 87 +++++++++++++++++++++++++++ > include/media/v4l2-subdev.h | 22 +++++++ > include/uapi/linux/v4l2-subdev.h | 52 ++++++++++++++++ > 4 files changed, 185 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c > index fddba75d9074..26b9a9626c96 100644 > --- a/drivers/media/v4l2-core/v4l2-ioctl.c > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c > @@ -16,6 +16,7 @@ > #include > #include > > +#include > #include > > #include /* for media_set_bus_info() */ > @@ -3151,6 +3152,21 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size, > ret = 1; > break; > } > + > + case VIDIOC_SUBDEV_G_ROUTING: > + case VIDIOC_SUBDEV_S_ROUTING: { > + struct v4l2_subdev_routing *routing = parg; > + > + if (routing->num_routes > 256) > + return -E2BIG; > + > + *user_ptr = u64_to_user_ptr(routing->routes); > + *kernel_ptr = (void **)&routing->routes; > + *array_size = sizeof(struct v4l2_subdev_route) > + * routing->num_routes; > + ret = 1; > + break; > + } > } > > return ret; > @@ -3397,8 +3413,15 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg, > /* > * Some ioctls can return an error, but still have valid > * results that must be returned. > + * > + * FIXME: subdev IOCTLS are partially handled here and partially in > + * v4l2-subdev.c and the 'always_copy' flag can only be set for IOCTLS > + * defined here as part of the 'v4l2_ioctls' array. As > + * VIDIOC_SUBDEV_G_ROUTING needs to return results to applications even > + * in case of failure, but it is not defined here as part of the > + * 'v4l2_ioctls' array, insert an ad-hoc check to address that. > */ > - if (err < 0 && !always_copy) > + if (err < 0 && !always_copy && cmd != VIDIOC_SUBDEV_G_ROUTING) > goto out; > > if (has_array_args) { > diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c > index 8983d33fdb4b..1a451351554b 100644 > --- a/drivers/media/v4l2-core/v4l2-subdev.c > +++ b/drivers/media/v4l2-core/v4l2-subdev.c > @@ -23,6 +23,16 @@ > #include > #include > > +/* > + * Maximum stream ID is 63 for now, as we use u64 bitmask to represent a set > + * of streams. > + * > + * Note that V4L2_FRAME_DESC_ENTRY_MAX is related: V4L2_FRAME_DESC_ENTRY_MAX > + * restricts the total number of streams in a pad, although the stream ID is > + * not restricted. > + */ > +#define V4L2_SUBDEV_MAX_STREAM_ID 63 > + > #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) > static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) > { > @@ -417,6 +427,10 @@ subdev_ioctl_get_state(struct v4l2_subdev *sd, struct v4l2_subdev_fh *subdev_fh, > case VIDIOC_SUBDEV_S_SELECTION: > which = ((struct v4l2_subdev_selection *)arg)->which; > break; > + case VIDIOC_SUBDEV_G_ROUTING: > + case VIDIOC_SUBDEV_S_ROUTING: > + which = ((struct v4l2_subdev_routing *)arg)->which; > + break; > } > > return which == V4L2_SUBDEV_FORMAT_TRY ? > @@ -733,6 +747,78 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg, > case VIDIOC_SUBDEV_QUERYSTD: > return v4l2_subdev_call(sd, video, querystd, arg); > > + case VIDIOC_SUBDEV_G_ROUTING: { > + struct v4l2_subdev_routing *routing = arg; > + struct v4l2_subdev_krouting *krouting; > + > + if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS)) > + return -ENOIOCTLCMD; > + > + memset(routing->reserved, 0, sizeof(routing->reserved)); > + > + krouting = &state->routing; > + > + if (routing->num_routes < krouting->num_routes) { > + routing->num_routes = krouting->num_routes; > + return -ENOSPC; > + } > + > + memcpy((struct v4l2_subdev_route *)(uintptr_t)routing->routes, > + krouting->routes, > + krouting->num_routes * sizeof(*krouting->routes)); > + routing->num_routes = krouting->num_routes; > + > + return 0; > + } > + > + case VIDIOC_SUBDEV_S_ROUTING: { > + struct v4l2_subdev_routing *routing = arg; > + struct v4l2_subdev_route *routes = > + (struct v4l2_subdev_route *)(uintptr_t)routing->routes; > + struct v4l2_subdev_krouting krouting = {}; > + unsigned int i; > + > + if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS)) > + return -ENOIOCTLCMD; > + > + if (routing->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev) > + return -EPERM; > + > + memset(routing->reserved, 0, sizeof(routing->reserved)); > + > + for (i = 0; i < routing->num_routes; ++i) { > + const struct v4l2_subdev_route *route = &routes[i]; > + const struct media_pad *pads = sd->entity.pads; > + > + if (route->sink_stream > V4L2_SUBDEV_MAX_STREAM_ID || > + route->source_stream > V4L2_SUBDEV_MAX_STREAM_ID) > + return -EINVAL; > + > + /* Do not check sink pad for source routes */ > + if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_SOURCE)) { > + if (route->sink_pad >= sd->entity.num_pads) > + return -EINVAL; > + > + if (!(pads[route->sink_pad].flags & > + MEDIA_PAD_FL_SINK)) > + return -EINVAL; > + } > + > + if (route->source_pad >= sd->entity.num_pads) > + return -EINVAL; > + > + if (!(pads[route->source_pad].flags & > + MEDIA_PAD_FL_SOURCE)) > + return -EINVAL; > + } > + > + krouting.num_routes = routing->num_routes; > + krouting.routes = routes; > + > + return v4l2_subdev_call(sd, pad, set_routing, state, > + routing->which, &krouting); > + } > + > default: > return v4l2_subdev_call(sd, core, ioctl, cmd, arg); > } > @@ -1016,6 +1102,7 @@ void __v4l2_subdev_state_free(struct v4l2_subdev_state *state) > > mutex_destroy(&state->_lock); > > + kfree(state->routing.routes); > kvfree(state->pads); > kfree(state); > } > diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h > index 4be0a590c7c7..4934dc9468a8 100644 > --- a/include/media/v4l2-subdev.h > +++ b/include/media/v4l2-subdev.h > @@ -695,12 +695,26 @@ struct v4l2_subdev_pad_config { > struct v4l2_rect try_compose; > }; > > +/** > + * struct v4l2_subdev_krouting - subdev routing table > + * > + * @num_routes: number of routes > + * @routes: &struct v4l2_subdev_route > + * > + * This structure contains the routing table for a subdev. > + */ > +struct v4l2_subdev_krouting { > + unsigned int num_routes; > + struct v4l2_subdev_route *routes; > +}; > + > /** > * struct v4l2_subdev_state - Used for storing subdev state information. > * > * @_lock: default for 'lock' > * @lock: mutex for the state. May be replaced by the user. > * @pads: &struct v4l2_subdev_pad_config array > + * @routing: routing table for the subdev > * > * This structure only needs to be passed to the pad op if the 'which' field > * of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For > @@ -711,6 +725,7 @@ struct v4l2_subdev_state { > struct mutex _lock; > struct mutex *lock; > struct v4l2_subdev_pad_config *pads; > + struct v4l2_subdev_krouting routing; > }; > > /** > @@ -763,6 +778,9 @@ struct v4l2_subdev_state { > * this operation as close as possible to stream on time. The > * operation shall fail if the pad index it has been called on > * is not valid or in case of unrecoverable failures. > + * > + * @set_routing: enable or disable data connection routes described in the > + * subdevice routing table. > */ > struct v4l2_subdev_pad_ops { > int (*init_cfg)(struct v4l2_subdev *sd, > @@ -805,6 +823,10 @@ struct v4l2_subdev_pad_ops { > struct v4l2_mbus_frame_desc *fd); > int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad, > struct v4l2_mbus_config *config); > + int (*set_routing)(struct v4l2_subdev *sd, > + struct v4l2_subdev_state *state, > + enum v4l2_subdev_format_whence which, > + struct v4l2_subdev_krouting *route); > }; > > /** > diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h > index 89af27f50a41..db4af236d7ed 100644 > --- a/include/uapi/linux/v4l2-subdev.h > +++ b/include/uapi/linux/v4l2-subdev.h > @@ -24,6 +24,7 @@ > #ifndef __LINUX_V4L2_SUBDEV_H > #define __LINUX_V4L2_SUBDEV_H > > +#include > #include > #include > #include > @@ -191,6 +192,55 @@ struct v4l2_subdev_capability { > /* The v4l2 sub-device supports routing and multiplexed streams. */ > #define V4L2_SUBDEV_CAP_STREAMS 0x00000002 > > +/* > + * Is the route active? An active route will start when streaming is enabled > + * on a video node. > + */ > +#define V4L2_SUBDEV_ROUTE_FL_ACTIVE (1U << 0) > + > +/* > + * Is the route a source endpoint? A source endpoint route refers to a stream > + * generated by the subdevice (usually a sensor), and thus there is no > + * sink-side endpoint for the route. The sink_pad and sink_stream fields are > + * unused. > + * Set by the driver. > + */ > +#define V4L2_SUBDEV_ROUTE_FL_SOURCE (1U << 1) Can we rename this to _FL_INTERNAL_SOURCE? Just 'SOURCE' is very confusing IMHO. The name 'INTERNAL_SOURCE' makes it clear that it is generated internally, and so does not come from an external sink-side endpoint. I also think that the documentation for this flag in patch 04/19 is very vague, I'll comment on that patch as well. Regards, Hans > + > +/** > + * struct v4l2_subdev_route - A route inside a subdev > + * > + * @sink_pad: the sink pad index > + * @sink_stream: the sink stream identifier > + * @source_pad: the source pad index > + * @source_stream: the source stream identifier > + * @flags: route flags V4L2_SUBDEV_ROUTE_FL_* > + * @reserved: drivers and applications must zero this array > + */ > +struct v4l2_subdev_route { > + __u32 sink_pad; > + __u32 sink_stream; > + __u32 source_pad; > + __u32 source_stream; > + __u32 flags; > + __u32 reserved[5]; > +}; > + > +/** > + * struct v4l2_subdev_routing - Subdev routing information > + * > + * @which: configuration type (from enum v4l2_subdev_format_whence) > + * @num_routes: the total number of routes in the routes array > + * @routes: pointer to the routes array > + * @reserved: drivers and applications must zero this array > + */ > +struct v4l2_subdev_routing { > + __u32 which; > + __u32 num_routes; > + __u64 routes; > + __u32 reserved[6]; > +}; > + > /* Backwards compatibility define --- to be removed */ > #define v4l2_subdev_edid v4l2_edid > > @@ -206,6 +256,8 @@ struct v4l2_subdev_capability { > #define VIDIOC_SUBDEV_S_CROP _IOWR('V', 60, struct v4l2_subdev_crop) > #define VIDIOC_SUBDEV_G_SELECTION _IOWR('V', 61, struct v4l2_subdev_selection) > #define VIDIOC_SUBDEV_S_SELECTION _IOWR('V', 62, struct v4l2_subdev_selection) > +#define VIDIOC_SUBDEV_G_ROUTING _IOWR('V', 38, struct v4l2_subdev_routing) > +#define VIDIOC_SUBDEV_S_ROUTING _IOWR('V', 39, struct v4l2_subdev_routing) > /* The following ioctls are identical to the ioctls in videodev2.h */ > #define VIDIOC_SUBDEV_G_STD _IOR('V', 23, v4l2_std_id) > #define VIDIOC_SUBDEV_S_STD _IOW('V', 24, v4l2_std_id)