[PATCH RFC v3 9/9] tools: board-id: Add test suite

[Elliot Berman <quic_eberman@quicinc.com>]

Add a short test suite to demonstrate board-id selection and scoring.
This patch isn't intended to be merged here.

After compiling the kernel (esp. arch/arm64/boot/dts/qcom DTBs), run
tools/board-id/test.py.

The test cases provide a hypothetical firmware-provied board-id and
compares expected output for which DTBs gets matched.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 tools/board-id/test.py | 151 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)

diff --git a/tools/board-id/test.py b/tools/board-id/test.py
new file mode 100644
index 000000000000..687b31ad73d2
--- /dev/null
+++ b/tools/board-id/test.py
@@ -0,0 +1,151 @@
+from collections import namedtuple
+import glob
+import os
+import subprocess
+from tempfile import NamedTemporaryFile
+import unittest
+
+
+LINUX_ROOT = os.path.abspath(os.path.join(__file__, "..", "..", ".."))
+ENV_WITH_DTC = {
+    "PATH": os.path.join(LINUX_ROOT, "scripts", "dtc") + os.pathsep + os.environ["PATH"]
+}
+
+
+TestCase = namedtuple("TestCase", ["score_all", "board_id", "output"])
+
+test_cases = [
+    TestCase(
+        # A board_id that could be provided by firmware
+        board_id="""
+        qcom,soc = <QCOM_ID_SM8650>;
+        qcom,soc-version = <QCOM_ID_SM8650 QCOM_SOC_REVISION(1)>;
+        qcom,platform = <QCOM_BOARD_ID_MTP>;
+        qcom,platform-type = <QCOM_BOARD_ID_MTP 0>;
+        qcom,platform-version = <QCOM_BOARD_ID_MTP 0 0x0100>;
+        qcom,boot-device = <QCOM_BOARD_BOOT_UFS>;
+        """,
+        score_all=False,
+        output="""
+        qcom/sm8650-mtp.dtb
+        """,
+    ),
+    TestCase(
+        # A board_id that could be provided by firmware
+        board_id="""
+        qcom,soc = <QCOM_ID_SM8550>;
+        qcom,soc-version = <QCOM_ID_SM8550 QCOM_SOC_REVISION(1)>;
+        qcom,platform = <QCOM_BOARD_ID_MTP>;
+        qcom,platform-type = <QCOM_BOARD_ID_MTP 0>;
+        qcom,platform-version = <QCOM_BOARD_ID_MTP 0 0x0100>;
+        qcom,boot-device = <QCOM_BOARD_BOOT_UFS>;
+        """,
+        score_all=True,
+        output="""
+        qcom/sm8550.dtb: 1
+        qcom/sm8550-mtp.dtb: 3
+        qcom/sm8550-mtp.dtbo: 2
+        """,
+    ),
+]
+
+
+def compile_board_id(board_id: str):
+    dts = f"""
+        /dts-v1/;
+
+        #include <dt-bindings/arm/qcom,ids.h>
+
+        / {{
+            compatible = "linux,dummy";
+            board-id {{
+                {board_id}
+            }};
+        }};
+        """
+    dts_processed = subprocess.run(
+        [
+            "gcc",
+            "-E",
+            "-nostdinc",
+            f"-I{os.path.join(LINUX_ROOT, 'scripts', 'dtc', 'include-prefixes')}",
+            "-undef",
+            "-D__DTS__",
+            "-x",
+            "assembler-with-cpp",
+            "-o" "-",
+            "-",
+        ],
+        stdout=subprocess.PIPE,
+        input=dts.encode("utf-8"),
+        check=True,
+    )
+    dtc = subprocess.run(
+        ["dtc", "-I", "dts", "-O", "dtb", "-o", "-", "-"],
+        stdout=subprocess.PIPE,
+        input=dts_processed.stdout,
+        env=ENV_WITH_DTC,
+    )
+    return dtc.stdout
+
+
+def select_boards(score_all, fwdtb):
+    with NamedTemporaryFile() as fwdtb_file:
+        fwdtb_file.write(fwdtb)
+        fwdtb_file.flush()
+        root_dir = os.path.join(LINUX_ROOT, "arch", "arm64", "boot", "dts")
+        return subprocess.run(
+            filter(
+                bool,
+                [
+                    "fdt-select-board",
+                    "-a" if score_all else None,
+                    "-r",
+                    fwdtb_file.name,
+                    *glob.glob(
+                        "qcom/*.dtb*",
+                        root_dir=root_dir,
+                    ),
+                ],
+            ),
+            stdout=subprocess.PIPE,
+            text=True,
+            cwd=root_dir,
+            env=ENV_WITH_DTC,
+            stderr=subprocess.STDOUT,
+        )
+
+
+def fixup_lines(s):
+    return '\n'.join(filter(bool, sorted(_s.strip() for _s in s.split('\n'))))
+
+
+class TestBoardIds(unittest.TestCase):
+    def __init__(self, index: int, args: TestCase) -> None:
+        super().__init__()
+        self.args = args
+        self.index = index
+
+    def runTest(self):
+        fwdtb = compile_board_id(self.args.board_id)
+        output = select_boards(self.args.score_all, fwdtb)
+        if output.stderr:
+            self.assertMultiLineEqual(output.stderr, "")
+        expected = fixup_lines(self.args.output)
+        actual = fixup_lines(output.stdout)
+        self.assertMultiLineEqual(expected, actual)
+
+    def __str__(self):
+        return f"Test case {self.index}"
+
+
+def suite():
+    suite = unittest.TestSuite()
+    for idx, test in enumerate(test_cases):
+        suite.addTest(TestBoardIds(idx + 1, test))
+    return suite
+
+
+if __name__ == "__main__":
+    runner = unittest.TextTestRunner()
+    runner.run(suite())

-- 
2.34.1