[Buildroot] [PATCH v7 8/8] support/testing: add virglrenderer test

[Joseph Kogut <joseph.kogut@gmail.com>]

Add basic smoke test for glmark2 running in a nested qemu guest with
virtio-gpu-gl-pci.

The outer machine uses the Mesa softpipe driver for GLES support with
minimal dependencies. Just test virgl for now, as lavapipe
(software Vulkan driver) requires LLVM, and this validates
virglrenderer.

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
---
 DEVELOPERS                                         |   1 +
 .../testing/tests/package/test_virglrenderer.py    | 117 +++++++++++++++++++++
 .../test_virglrenderer/linux-virgl.fragment        |   6 ++
 .../test_virglrenderer/remove-qemu-blobs.sh        |  12 +++
 .../rootfs-overlay/etc/profile.d/stty-raw.sh       |   3 +
 5 files changed, 139 insertions(+)

diff --git a/DEVELOPERS b/DEVELOPERS
index 774eb0b746..0c0779e8b3 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1766,6 +1766,7 @@ F:	package/sentry-cli/
 F:	package/sentry-native/
 F:	package/unclutter-xfixes/
 F:	package/virglrenderer/
+F:	support/testing/tests/package/test_virglrenderer.py
 
 N:	Joshua Henderson <joshua.henderson@microchip.com>
 F:	package/qt5/qt5wayland/
diff --git a/support/testing/tests/package/test_virglrenderer.py b/support/testing/tests/package/test_virglrenderer.py
new file mode 100644
index 0000000000..521a4b67cd
--- /dev/null
+++ b/support/testing/tests/package/test_virglrenderer.py
@@ -0,0 +1,117 @@
+import os
+
+import infra
+import infra.basetest
+
+
+class TestVirglrendererNestedQemu(infra.basetest.BRTest):
+    # We reuse the same initramfs-enabled kernel for the outer target and
+    # nested guest. This fragment adds initramfs and 9p support so the outer
+    # target can mount the runner's images directory and launch the same kernel
+    # under target-side QEMU. We also enable DRM_VGEM to create the necessary
+    # DRI device node, a requirement of qemu when using virgl.
+    kern_frag = \
+        infra.filepath("tests/package/test_virglrenderer/linux-virgl.fragment")
+    post_build = \
+        infra.filepath("tests/package/test_virglrenderer/remove-qemu-blobs.sh")
+    rootfs_overlay = \
+        infra.filepath("tests/package/test_virglrenderer/rootfs-overlay")
+
+    # Softpipe has no hardware dependencies and does not pull LLVM into the
+    # build, unlike llvmpipe/lavapipe.
+    config = \
+        f"""
+        BR2_x86_64=y
+        BR2_x86_nehalem=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_X86_64_CORE_I7_GLIBC_STABLE=y
+        BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
+        BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
+        BR2_ROOTFS_OVERLAY="{rootfs_overlay}"
+        BR2_ROOTFS_POST_BUILD_SCRIPT="{post_build}"
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.21"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux.config"
+        BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{kern_frag}"
+        BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
+        # BR2_PACKAGE_EUDEV_ENABLE_HWDB is not set
+        BR2_PACKAGE_GLMARK2=y
+        BR2_PACKAGE_LIBGLVND=y
+        BR2_PACKAGE_MESA3D=y
+        BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_SOFTPIPE=y
+        BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VIRGL=y
+        BR2_PACKAGE_MESA3D_OPENGL_EGL=y
+        BR2_PACKAGE_MESA3D_OPENGL_ES=y
+        BR2_PACKAGE_QEMU=y
+        BR2_PACKAGE_QEMU_SYSTEM=y
+        # BR2_PACKAGE_QEMU_SYSTEM_KVM is not set
+        BR2_PACKAGE_QEMU_SYSTEM_TCG=y
+        BR2_PACKAGE_QEMU_CHOOSE_TARGETS=y
+        BR2_PACKAGE_QEMU_TARGET_X86_64=y
+        BR2_PACKAGE_QEMU_VIRGLRENDERER=y
+        BR2_TARGET_ROOTFS_INITRAMFS=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def boot_outer(self):
+        kern = os.path.join(self.builddir, "images", "bzImage")
+        img_dir = os.path.join(self.builddir, "images")
+        virtfs_tag = "br-imgs"
+        virtfs_opts = [
+            f"local,path={img_dir}",
+            f"mount_tag={virtfs_tag}",
+            "security_model=mapped-xattr",
+            "readonly=on"
+        ]
+        self.emulator.boot(arch="x86_64",
+                           kernel=kern,
+                           kernel_cmdline=["console=ttyS0"],
+                           options=["-cpu", "Nehalem",
+                                    "-m", "1536M",
+                                    "-smp", "4",
+                                    "-vga", "none",
+                                    "-virtfs", ",".join(virtfs_opts)])
+        self.emulator.login()
+        self.assertRunOk(f"mount -t 9p {virtfs_tag} /mnt/")
+
+    def boot_nested(self):
+        qemu_cmd = "env LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=softpipe"
+        qemu_cmd += " qemu-system-x86_64"
+        qemu_cmd += " -M q35,accel=tcg"
+        qemu_cmd += " -cpu Nehalem"
+        qemu_cmd += " -m 512M"
+        qemu_cmd += " -smp 4"
+        qemu_cmd += " -nodefaults"
+        qemu_cmd += " -display egl-headless,gl=on"
+        qemu_cmd += " -device virtio-gpu-gl-pci"
+        qemu_cmd += " -serial stdio"
+        qemu_cmd += " -kernel /mnt/bzImage"
+        qemu_cmd += " -append 'console=ttyS0 br-nested-virgl'"
+
+        # qemu runs in the foreground on the current serial console. Once it
+        # starts, the next login prompt belongs to the nested guest.
+        self.emulator.qemu.sendline(qemu_cmd)
+        self.emulator.login(timeout=180)
+
+    def test_run(self):
+        self.boot_outer()
+        self.assertRunOk("while [ ! -e /dev/dri/renderD128 ]; do sleep 1; done",
+                         timeout=30)
+
+        self.boot_nested()
+
+        out, ret = self.emulator.run("cat /proc/cmdline")
+        self.assertEqual(ret, 0)
+        self.assertIn("br-nested-virgl", out[0])
+
+        cmd = "env MESA_LOADER_DRIVER_OVERRIDE=virtio_gpu"
+        cmd += " glmark2-es2-drm --validate --off-screen"
+        cmd += " --benchmark build:use-vbo=false"
+        out, ret = self.emulator.run(cmd, timeout=60)
+        self.assertEqual(ret, 0)
+
+        renderer = "\n".join([line for line in out if "GL_RENDERER:" in line])
+        self.assertRegex(renderer, r"(?i)virgl")
+        self.assertRegex(renderer, r"(?i)softpipe")
diff --git a/support/testing/tests/package/test_virglrenderer/linux-virgl.fragment b/support/testing/tests/package/test_virglrenderer/linux-virgl.fragment
new file mode 100644
index 0000000000..1023aedc6f
--- /dev/null
+++ b/support/testing/tests/package/test_virglrenderer/linux-virgl.fragment
@@ -0,0 +1,6 @@
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_DRM_VGEM=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
+CONFIG_9P_FS=y
+CONFIG_9P_FS_POSIX_ACL=y
diff --git a/support/testing/tests/package/test_virglrenderer/remove-qemu-blobs.sh b/support/testing/tests/package/test_virglrenderer/remove-qemu-blobs.sh
new file mode 100755
index 0000000000..ff040aa96b
--- /dev/null
+++ b/support/testing/tests/package/test_virglrenderer/remove-qemu-blobs.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -eu
+
+qemu_dir="${TARGET_DIR}/usr/share/qemu"
+
+find "${qemu_dir}" -type f \
+	! -name 'bios-256k.bin' \
+	! -name 'kvmvapic.bin' \
+	! -name 'linuxboot.bin' \
+	! -name 'linuxboot_dma.bin' \
+	-delete
diff --git a/support/testing/tests/package/test_virglrenderer/rootfs-overlay/etc/profile.d/stty-raw.sh b/support/testing/tests/package/test_virglrenderer/rootfs-overlay/etc/profile.d/stty-raw.sh
new file mode 100644
index 0000000000..bc1857a910
--- /dev/null
+++ b/support/testing/tests/package/test_virglrenderer/rootfs-overlay/etc/profile.d/stty-raw.sh
@@ -0,0 +1,3 @@
+# Avoid double-cooking the nested serial console, otherwise the test
+# infrastructure cannot reliably retrieve return codes.
+grep -Fq br-nested-virgl /proc/cmdline && stty raw

-- 
2.54.0

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