support/testing: add runtime test for Mesa3D Rusticl

This test verifies that clinfo correctly detects the rustiCL platform
and llvmpipe as device.

We check:
  - exit code,
  - Platform name matches rusticl,
  - Device name matches llvmpipe.

Signed-off-by: El Mehdi YOUNES <elmehdi.younes@smile.fr>
[Julien:
 - rename file to test_mesa3d.py
 - add Medhi in DEVELOPERS for this test file
]
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -914,6 +914,7 @@ F:	package/docopt-cpp/
 N:	El Mehdi YOUNES <elmehdi.younes@smile.fr>
 F:	package/opencl-headers/
 F:	package/opencl-icd-loader/
+F:	support/testing/tests/package/test_mesa3d.py
 
 N:	Eloi Bail <eloi.bail@savoirfairelinux.com>
 F:	package/bayer2rgb-neon/

support/testing/tests/package/test_mesa3d.py

@@ -0,0 +1,53 @@
+import os
+import infra.basetest
+
+RUSTICL_TIMEOUT = 180
+
+
+class TestMesa3DRusticl(infra.basetest.BRTest):
+    config = """
+        BR2_aarch64=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.31"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+        BR2_PACKAGE_MESA3D=y
+        BR2_PACKAGE_MESA3D_LLVM=y
+        BR2_PACKAGE_MESA3D_OPENCL=y
+        BR2_PACKAGE_MESA3D_RUSTICL=y
+        BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_LLVMPIPE=y
+        BR2_PACKAGE_CLINFO=y
+        BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+        BR2_TARGET_ROOTFS_EXT2=y
+        BR2_TARGET_ROOTFS_EXT2_SIZE="1024M"
+        # BR2_TARGET_ROOTFS_TAR is not set
+    """
+
+    def login(self):
+        img = os.path.join(self.builddir, "images", "rootfs.ext2")
+        kern = os.path.join(self.builddir, "images", "Image")
+        self.emulator.boot(
+            arch="aarch64",
+            kernel=kern,
+            kernel_cmdline=["root=/dev/vda console=ttyAMA0"],
+            options=[
+                "-M", "virt",
+                "-cpu", "cortex-a57",
+                "-m", "512",
+                "-drive", f"file={img},if=virtio,format=raw"
+            ]
+        )
+        self.emulator.login()
+
+    def test_run(self):
+        self.login()
+
+        # check the output exit code
+        output, exit_code = self.emulator.run("RUSTICL_ENABLE=llvmpipe clinfo", RUSTICL_TIMEOUT)
+        self.assertEqual(exit_code, 0)
+        # also check if platform name is rusticl and device name is llvmpipe
+        self.assertRegex("\n".join(output), r"Platform Name\s+rusticl")
+        self.assertRegex("\n".join(output), r"Device Name\s+llvmpipe")