Re: [RFC PATCH 10/77] tests: Add basic metadata tests

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Jan 12, 2026 at 03:19:00PM +0100, Herve Codina wrote:
> This first test is related to local phandle references (FDT_REF_LOCAL
> dtb tag).
> 
> The test pattern used is
>   - Generate a dts (xxx.dts.dts) from an input dts
>   - Check this generated dts against expected contents
>   - Generate a dtb (xxx.dtb) from the same input dts
>   - Check this generated dtb against expected contents
>   - Generate a dts (xxx.dtb.dts) from the generated dtb
>   - Check this generated dts against expected contents
>   - Generate a dtb (xxx.dtb.dts.dtb) from the generated dts
>   - Check this generated dtb, expect the same contents as for xxx.dtb
> 
> Even if only one meta-data feature is currently tested in this tests
> introduction, use a loop in order to ease future addition consisting in
> adding new input dts as soon as new meta-data feature are supported.

As a rule of tumb, I prefer tests to be introduced in the same patch
that introduces the feature tested.  Usually, I don't care that much,
but in a giant series like this, it would really help review (the
tests help to document the feature being added without switching
between patches).

> 
> Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> ---
>  tests/meson.build                      |  3 +-
>  tests/metadata_reflocal.dtb.dts.expect | 23 ++++++++++
>  tests/metadata_reflocal.dtb.expect     | 20 +++++++++
>  tests/metadata_reflocal.dts            | 27 ++++++++++++
>  tests/metadata_reflocal.dts.dts.expect | 23 ++++++++++
>  tests/run_tests.sh                     | 58 +++++++++++++++++++++++++-
>  6 files changed, 152 insertions(+), 2 deletions(-)
>  create mode 100644 tests/metadata_reflocal.dtb.dts.expect
>  create mode 100644 tests/metadata_reflocal.dtb.expect
>  create mode 100644 tests/metadata_reflocal.dts
>  create mode 100644 tests/metadata_reflocal.dts.dts.expect
> 
> diff --git a/tests/meson.build b/tests/meson.build
> index 37bfd47..e81a2e1 100644
> --- a/tests/meson.build
> +++ b/tests/meson.build
> @@ -140,7 +140,8 @@ run_test_types = [
>    'fdtget',
>    'fdtput',
>    'fdtdump',
> -  'fdtoverlay'
> +  'fdtoverlay',
> +  'metadata'
>  ]
>  run_test_deps = [
>    dtc_tools, dumptrees_dtb, tests_exe
> diff --git a/tests/metadata_reflocal.dtb.dts.expect b/tests/metadata_reflocal.dtb.dts.expect
> new file mode 100644
> index 0000000..076c17a
> --- /dev/null
> +++ b/tests/metadata_reflocal.dtb.dts.expect
> @@ -0,0 +1,23 @@
> +/dts-v1/;
> +
> +/ {
> +
> +	node-a {
> +
> +		subnode-a {
> +			phandle = <0x01>;
> +		};
> +	};
> +
> +	node-b {
> +		phandle = <0x02>;
> +	};
> +
> +	node-c {
> +	};
> +
> +	node-d {
> +		ref-subnode-a = <&{/node-a/subnode-a}>;
> +		ref-node-b = <0x123 0x456 &{/node-b} 0x789>;
> +	};
> +};
> diff --git a/tests/metadata_reflocal.dtb.expect b/tests/metadata_reflocal.dtb.expect
> new file mode 100644
> index 0000000..33b3896
> --- /dev/null
> +++ b/tests/metadata_reflocal.dtb.expect
> @@ -0,0 +1,20 @@
> +/dts-v1/;
> +
> +/ {
> +    node-a {
> +        subnode-a {
> +            phandle = <0x00000001>;
> +        };
> +    };
> +    node-b {
> +        phandle = <0x00000002>;
> +    };
> +    node-c {
> +    };
> +    node-d {
> +        ref-subnode-a = <0x00000001>;
> +        // [FDT_REF_LOCAL] ref-subnode-a[0]
> +        ref-node-b = <0x00000123 0x00000456 0x00000002 0x00000789>;
> +        // [FDT_REF_LOCAL] ref-node-b[8]
> +    };
> +};
> diff --git a/tests/metadata_reflocal.dts b/tests/metadata_reflocal.dts
> new file mode 100644
> index 0000000..f04d24f
> --- /dev/null
> +++ b/tests/metadata_reflocal.dts
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
> +/*
> + * Copyright (C) 2026 Bootlin
> + */
> +
> +/dts-v1/;
> +
> +/ {
> +	node-a {
> +		subnode_a: subnode-a {
> +		};
> +	};
> +
> +	node_b: node-b {
> +	};
> +
> +	node-c {
> +	};
> +
> +	node_d: node-d {
> +		ref-subnode-a = <&subnode_a>;
> +	};
> +};
> +
> +&node_d {
> +	ref-node-b = <0x123 0x456 &node_b 0x789>;
> +};
> diff --git a/tests/metadata_reflocal.dts.dts.expect b/tests/metadata_reflocal.dts.dts.expect
> new file mode 100644
> index 0000000..b72b545
> --- /dev/null
> +++ b/tests/metadata_reflocal.dts.dts.expect
> @@ -0,0 +1,23 @@
> +/dts-v1/;
> +
> +/ {
> +
> +	node-a {
> +
> +		subnode_a: subnode-a {
> +			phandle = <0x01>;
> +		};
> +	};
> +
> +	node_b: node-b {
> +		phandle = <0x02>;
> +	};
> +
> +	node-c {
> +	};
> +
> +	node_d: node-d {
> +		ref-subnode-a = <&subnode_a>;
> +		ref-node-b = <0x123 0x456 &node_b 0x789>;
> +	};
> +};
> diff --git a/tests/run_tests.sh b/tests/run_tests.sh
> index f07092b..7a8bdbc 100755
> --- a/tests/run_tests.sh
> +++ b/tests/run_tests.sh
> @@ -1090,6 +1090,59 @@ fdtoverlay_tests() {
>      run_wrap_test test "$bd" = "$pd"
>  }
>  
> +# $1: f1 file
> +# $2: f2 file
> +check_diff () {
> +    printf "diff $1 $2:	"
> +    local f1="$1"
> +    local f2="$2"
> +    (
> +        if diff $f1 $f2 >/dev/null; then
> +            PASS
> +        else
> +            if [ -z "$QUIET_TEST" ]; then
> +                echo "DIFF :-:"
> +                diff -u $f1 $f2
> +            fi
> +            FAIL "Results differ from expected"
> +        fi
> +    )
> +}
> +
> +# $1: dtb file
> +# $2: out file
> +wrap_fdtdump () {
> +    printf "wrap_fdtdump $1:	"
> +    local dtb="$1"
> +    local out="$2"
> +    (
> +        if $FDTDUMP ${dtb} 2>/dev/null >${out}; then
> +            PASS
> +        else
> +            FAIL
> +        fi
> +    )
> +}
> +
> +metadata_tests() {
> +	for dt in metadata_reflocal; do
> +		run_dtc_test -I dts -O dts -o $dt.dts.dts "$SRCDIR/$dt.dts"
> +		base_run_test check_diff $dt.dts.dts "$SRCDIR/$dt.dts.dts.expect"
> +		run_dtc_test -I dts -O dtb -o $dt.dtb "$SRCDIR/$dt.dts"
> +		base_run_test wrap_fdtdump $dt.dtb $dt.dtb.out
> +		# Remove unneeded comments
> +		sed -i '/^\/\/ /d' $dt.dtb.out
> +		base_run_test check_diff $dt.dtb.out "$SRCDIR/$dt.dtb.expect"
> +		run_dtc_test -I dtb -O dts -o $dt.dtb.dts $dt.dtb
> +		base_run_test check_diff $dt.dtb.dts "$SRCDIR/$dt.dtb.dts.expect"
> +		run_dtc_test -I dts -O dtb -o $dt.dtb.dts.dtb $dt.dtb.dts
> +		base_run_test wrap_fdtdump $dt.dtb.dts.dtb $dt.dtb.dts.dtb.out
> +		# Remove unneeded comments
> +		sed -i '/^\/\/ /d' $dt.dtb.dts.dtb.out
> +		base_run_test check_diff $dt.dtb.dts.dtb.out "$SRCDIR/$dt.dtb.expect"
> +	done
> +}
> +
>  pylibfdt_tests () {
>      run_dtc_test -I dts -O dtb -o test_props.dtb "$SRCDIR/test_props.dts"
>      TMP=/tmp/tests.stderr.$$
> @@ -1129,7 +1182,7 @@ while getopts "vt:me" ARG ; do
>  done
>  
>  if [ -z "$TESTSETS" ]; then
> -    TESTSETS="libfdt utilfdt dtc dtbs_equal fdtget fdtput fdtdump fdtoverlay"
> +    TESTSETS="libfdt utilfdt dtc dtbs_equal fdtget fdtput fdtdump fdtoverlay metadata"
>  
>      # Test pylibfdt if the libfdt Python module is available.
>      if ! $no_python; then
> @@ -1169,6 +1222,9 @@ for set in $TESTSETS; do
>          "fdtoverlay")
>  	    fdtoverlay_tests
>  	    ;;
> +	"metadata")
> +	    metadata_tests
> +	    ;;
>      esac
>  done
>  
> -- 
> 2.52.0
> 
> 

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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