From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Add a v4l2_subdev_routing_validate() helper for verifying routing for
common cases like only allowing non-overlapping 1-to-1 streams.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-subdev.c | 102 ++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 39 ++++++++++
2 files changed, 141 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 92a3142fcf23..4fdde9d8c07d 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1644,6 +1644,108 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
+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];
+
+ /*
+ * 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;
+ }
+
+ /*
+ * 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;
+ }
+ }
+ }
+
+ ret = 0;
+
+out:
+ kfree(remote_pads);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index cacc56ee3ee6..69331adb0aca 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1572,6 +1572,45 @@ struct v4l2_mbus_framefmt *
v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
u32 pad, u32 stream);
+/**
+ * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
+ *
+ * @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 constraints.
+ *
+ * Returns 0 on success, error value otherwise.
+ */
+int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
+ const struct v4l2_subdev_krouting *routing,
+ enum v4l2_subdev_routing_restriction disallow);
+
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */
--
2.34.1
