From patchwork Thu Dec 16 13:15:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12681159 X-Patchwork-Delegate: kieran@bingham.xyz 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 0F96FC43219 for ; Thu, 16 Dec 2021 13:15:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237413AbhLPNPX (ORCPT ); Thu, 16 Dec 2021 08:15:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237400AbhLPNPX (ORCPT ); Thu, 16 Dec 2021 08:15:23 -0500 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F9F2C061574; Thu, 16 Dec 2021 05:15:23 -0800 (PST) Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 69AE1993; Thu, 16 Dec 2021 14:15:21 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1639660521; bh=qSiMi5Rpfq2U4b5DdovAUiPFEtav+QU+8QzWfmEG8cg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HkM+zvcP/JkkKVYIoEt5ZRqNQGbKOWjgSkm6olgonf+soqBErV4DqJfPeJWNvGevM ERuIwtITy8qIL+5ZmTL9dUi/GWod+Wxo8FNNXyHP/6jvGhxiC8JNAsl88bMJSVSTBd I7Pe1jnUbqLF2Og0vd4Y5h3BeMafjg1hxE48yfu4= From: Laurent Pinchart To: linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: Jacopo Mondi , Tomi Valkeinen Subject: [PATCH 2/2] media: subdev: Extend routing validation helper Date: Thu, 16 Dec 2021 15:15:10 +0200 Message-Id: <20211216131510.12308-3-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211216131510.12308-1-laurent.pinchart+renesas@ideasonboard.com> References: <20211216131510.12308-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org There are more common constraints on routing than the ones validated by v4l2_subdev_routing_validate_1_to_1(). Extend the function to support more validation, conditioned by constraint flags. Signed-off-by: Laurent Pinchart --- drivers/media/v4l2-core/v4l2-subdev.c | 97 ++++++++++++++++++++++++--- include/media/v4l2-subdev.h | 41 ++++++++--- 2 files changed, 121 insertions(+), 17 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 73ee7f01838f..e7fb694cc5df 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -1582,29 +1583,107 @@ int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, } EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt); -int v4l2_subdev_routing_validate_1_to_1(const struct v4l2_subdev_krouting *routing) +int v4l2_subdev_routing_validate(struct v4l2_subdev *sd, + const struct v4l2_subdev_krouting *routing, + enum v4l2_subdev_routing_restriction disallow) { + u32 *remote_pads = NULL; unsigned int i, j; + int ret = -EINVAL; + + if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) { + remote_pads = kcalloc(sd->entity.num_pads, sizeof(*remote_pads), + GFP_KERNEL); + if (!remote_pads) + return -ENOMEM; + + for (i = 0; i < sd->entity.num_pads; ++i) + remote_pads[i] = U32_MAX; + } for (i = 0; i < routing->num_routes; ++i) { const struct v4l2_subdev_route *route = &routing->routes[i]; + /* Validate the sink and source pad numbers. */ + if (route->sink_pad >= sd->entity.num_pads || + !(sd->entity.pads[route->sink_pad].flags & MEDIA_PAD_FL_SINK)) { + dev_dbg(sd->dev, "route %u sink (%u) is not a sink pad\n", + i, route->sink_pad); + goto out; + } + + if (route->source_pad >= sd->entity.num_pads || + !(sd->entity.pads[route->source_pad].flags & MEDIA_PAD_FL_SOURCE)) { + dev_dbg(sd->dev, "route %u source (%u) is not a source pad\n", + i, route->source_pad); + goto out; + } + + /* + * V4L2_SUBDEV_ROUTING_NO_STREAM_MIX: Streams on the same pad + * may not be routed to streams on different pads. + */ + if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) { + if (remote_pads[route->sink_pad] != U32_MAX && + remote_pads[route->sink_pad] != route->source_pad) { + dev_dbg(sd->dev, + "route %u attempts to mix %s streams\n", + i, "sink"); + goto out; + } + + if (remote_pads[route->source_pad] != U32_MAX && + remote_pads[route->source_pad] != route->sink_pad) { + dev_dbg(sd->dev, + "route %u attempts to mix %s streams\n", + i, "source"); + goto out; + } + + remote_pads[route->sink_pad] = route->source_pad; + remote_pads[route->source_pad] = route->sink_pad; + } + for (j = i + 1; j < routing->num_routes; ++j) { const struct v4l2_subdev_route *r = &routing->routes[j]; - if (route->sink_pad == r->sink_pad && - route->sink_stream == r->sink_stream) - return -EINVAL; + /* + * V4L2_SUBDEV_ROUTING_NO_1_TO_N: No two routes can + * originate from the same (sink) stream. + */ + if ((disallow & V4L2_SUBDEV_ROUTING_NO_1_TO_N) && + route->sink_pad == r->sink_pad && + route->sink_stream == r->sink_stream) { + dev_dbg(sd->dev, + "routes %u and %u originate from same sink (%u/%u)\n", + i, j, route->sink_pad, + route->sink_stream); + goto out; + } - if (route->source_pad == r->source_pad && - route->source_stream == r->source_stream) - return -EINVAL; + /* + * V4L2_SUBDEV_ROUTING_NO_N_TO_1: No two routes can end + * at the same (source) stream. + */ + if ((disallow & V4L2_SUBDEV_ROUTING_NO_N_TO_1) && + route->source_pad == r->source_pad && + route->source_stream == r->source_stream) { + dev_dbg(sd->dev, + "routes %u and %u end at same source (%u/%u)\n", + i, j, route->source_pad, + route->source_stream); + goto out; + } } } - return 0; + ret = 0; + +out: + kfree(remote_pads); + return ret; } -EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate_1_to_1); +EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate); struct v4l2_subdev_route * __v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing, diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index aff1fb3a30d5..65c3e419a57d 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -1573,18 +1573,43 @@ int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, struct v4l2_subdev_format *format); /** - * v4l2_subdev_routing_validate_1_to_1() - Verify that all streams are - * non-overlapping 1-to-1 streams - * @routing: routing to verify + * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions * - * This verifies that the given routing contains only non-overlapping 1-to-1 - * streams. In other words, no two streams have the same source or sink - * stream ID on a single pad. This is the most common case of routing - * supported by devices. + * @V4L2_SUBDEV_ROUTING_NO_1_TO_N: + * an input stream may not be routed to multiple output streams (stream + * duplication) + * @V4L2_SUBDEV_ROUTING_NO_N_TO_1: + * multiple input streams may not be routed to the same output stream + * (stream merging) + * @V4L2_SUBDEV_ROUTING_NO_STREAM_MIX: + * streams on the same pad may not be routed to streams on different pads + * @V4L2_SUBDEV_ROUTING_ONLY_1_TO_1: + * only non-overlapping 1-to-1 stream routing is allowed (a combination of + * @V4L2_SUBDEV_ROUTING_NO_1_TO_N and @V4L2_SUBDEV_ROUTING_NO_N_TO_1) + */ +enum v4l2_subdev_routing_restriction { + V4L2_SUBDEV_ROUTING_NO_1_TO_N = BIT(0), + V4L2_SUBDEV_ROUTING_NO_N_TO_1 = BIT(1), + V4L2_SUBDEV_ROUTING_NO_STREAM_MIX = BIT(2), + V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 = + V4L2_SUBDEV_ROUTING_NO_1_TO_N | + V4L2_SUBDEV_ROUTING_NO_N_TO_1, +}; + +/** + * v4l2_subdev_routing_validate() - Verify that routes comply with driver + * constraints + * @sd: The subdevice + * @routing: Routing to verify + * @disallow: Restrictions on routes + * + * This verifies that the given routing complies with the @disallow contraints. * * Returns 0 on success, error value otherwise. */ -int v4l2_subdev_routing_validate_1_to_1(const struct v4l2_subdev_krouting *routing); +int v4l2_subdev_routing_validate(struct v4l2_subdev *sd, + const struct v4l2_subdev_krouting *routing, + enum v4l2_subdev_routing_restriction disallow); struct v4l2_subdev_route * __v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,