linux/Documentation/gpu/dp-mst/topology-figure-1.dot

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digraph T {
/* Make sure our payloads are always drawn below the driver node */
subgraph cluster_driver {
fillcolor = grey;
style = filled;
driver -> {payload1, payload2} [dir=none];
}
/* Driver malloc references */
edge [style=dashed];
driver -> port1;
driver -> port2;
driver -> port3:e;
driver -> port4;
payload1:s -> port1:e;
payload2:s -> port3:e;
edge [style=""];
subgraph cluster_topology {
label="Topology Manager";
labelloc=bottom;
/* Topology references */
mstb1 -> {port1, port2};
port1 -> mstb2;
port2 -> mstb3 -> {port3, port4};
port3 -> mstb4;
/* Malloc references */
edge [style=dashed;dir=back];
mstb1 -> {port1, port2};
port1 -> mstb2;
port2 -> mstb3 -> {port3, port4};
port3 -> mstb4;
}
driver [label="DRM driver";style=filled;shape=box;fillcolor=lightblue];
payload1 [label="Payload #1";style=filled;shape=box;fillcolor=lightblue];
payload2 [label="Payload #2";style=filled;shape=box;fillcolor=lightblue];
mstb1 [label="MSTB #1";style=filled;fillcolor=palegreen;shape=oval];
mstb2 [label="MSTB #2";style=filled;fillcolor=palegreen;shape=oval];
mstb3 [label="MSTB #3";style=filled;fillcolor=palegreen;shape=oval];
mstb4 [label="MSTB #4";style=filled;fillcolor=palegreen;shape=oval];
port1 [label="Port #1";shape=oval];
port2 [label="Port #2";shape=oval];
port3 [label="Port #3";shape=oval];
port4 [label="Port #4";shape=oval];
}