support/testing: add trace-cmd runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1830,6 +1830,8 @@ F:	support/testing/tests/package/test_tcl.py
 F:	support/testing/tests/package/test_tcl/
 F:	support/testing/tests/package/test_tcpdump.py
 F:	support/testing/tests/package/test_tesseract_ocr.py
+F:	support/testing/tests/package/test_trace_cmd.py
+F:	support/testing/tests/package/test_trace_cmd/
 F:	support/testing/tests/package/test_weston.py
 F:	support/testing/tests/package/test_weston/
 F:	support/testing/tests/package/test_xz.py

support/testing/tests/package/test_trace_cmd.py

@@ -0,0 +1,54 @@
+import os
+
+import infra.basetest
+
+
+class TestTraceCmd(infra.basetest.BRTest):
+    # A specific configuration is needed for testing trace-cmd.
+    # The function tracer need to be enabled in the Kernel.
+    kern_fragment = \
+        infra.filepath("tests/package/test_trace_cmd/linux-ftrace.fragment")
+    config = \
+        f"""
+        BR2_aarch64=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.1.74"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+        BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{kern_fragment}"
+        BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+        BR2_PACKAGE_TRACE_CMD=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        BR2_TARGET_ROOTFS_CPIO_GZIP=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        img = os.path.join(self.builddir, "images", "rootfs.cpio.gz")
+        kern = os.path.join(self.builddir, "images", "Image")
+        self.emulator.boot(arch="aarch64",
+                           kernel=kern,
+                           kernel_cmdline=["console=ttyAMA0"],
+                           options=["-M", "virt",
+                                    "-cpu", "cortex-a57",
+                                    "-m", "256M",
+                                    "-initrd", img])
+        self.emulator.login()
+
+        # Record calls to kmalloc() from a simple command.
+        self.assertRunOk("trace-cmd record -e kmalloc ls -l /")
+
+        # Show information about the trace.dat file.
+        self.assertRunOk("trace-cmd dump")
+
+        # Generate a text report of the trace.
+        self.assertRunOk("trace-cmd report > trace.txt")
+
+        # Check we have occurrences of "kmalloc:" in the trace report.
+        cmd = "grep -Fc kmalloc: trace.txt"
+        output, exit_code = self.emulator.run(cmd)
+        self.assertEquals(exit_code, 0)
+        self.assertTrue(int(output[0]) > 0)

support/testing/tests/package/test_trace_cmd/linux-ftrace.fragment

@@ -0,0 +1 @@
+CONFIG_FTRACE=y