docs/resources/diagrams/plantuml/el3_spm_dfd.puml

/'
 ' Copyright (c) 2022, Arm Limited. All rights reserved.
 '
 ' SPDX-License-Identifier: BSD-3-Clause
 '/

/'
TF-A EL3 SPMC Data Flow Diagram
'/

@startuml
digraph tfa_el3_dfd {

    # Allow arrows to end on cluster boundaries
    compound=true
    concentrate=false
    newrank=true

    # Default settings for edges and nodes
    edge [minlen=2 color="#8c1b07"]
    node [fillcolor="#ffb866" style=filled shape=box fixedsize=true width=1.6 height=0.7]

    # Nodes outside of the trust boundary
    nsec [label="NS Client"]
    ddr  [label="External memory (DDR)"]

    {rank="same" smmu, spmd}
    # Trust boundary cluster
    subgraph cluster_trusted {
        graph [style=dashed color="#f22430"]
        concentrate=false

        # HW IPs cluster
        subgraph cluster_ip {
            label ="Hardware IPs";
            graph [style=filled color="#000000" fillcolor="#ffd29e"]

            rank="same"
            gic [label="GIC" width=1.2 height=0.5]
            smmu [label="SMMU" width=1.2 height=0.5]
            uart [label="UART" width=1.2 height=0.5]
            pe [label="PE" width=1.2 height=0.5]
        }

        # TF-A cluster
        subgraph cluster_tfa {
            label ="EL3 monitor";
            graph [style=filled color="#000000" fillcolor="#faf9cd"]
            {rank="same" spmc, bl31}
            {rank="same" spmd, lsp}
            spmc [label="SPMC" fillcolor="#ddffb3"]
            bl31 [label="BL31" fillcolor="#ddffb3"];
            spmd [label="SPMD" fillcolor="#ddffb3"]
            lsp[label="LSP1" fillcolor="#ddffb3"]
        }
        bl2 [label="BL2" width=1.2 height=0.5]
    }

    # Secure Partitions cluster
    subgraph cluster_sp {
        label ="Secure Partitions";
        graph [style=filled color="#000000" fillcolor="#faf9cd"]

        sp1 [label="SP1" fillcolor="#ddffb3"]
    }

    sp1 -> spmc [dir="both" label="DF1"]
    lsp -> spmc [dir="both" label="DF4"]
    spmc -> spmd [dir="both" label="DF2"]
    spmd -> nsec [dir="both" label="DF3"]
    spmc -> smmu [lhead=cluster_spmc label="DF5"]
    bl2 -> spmc [lhead=cluster_spmc label="DF6"]
    bl2 -> sp1 [lhead=cluster_spmc label="DF6"]
    sp1 -> ddr [dir="both"  label="DF7"]
    spmc -> ddr [dir="both"  label="DF7"]
}

@enduml