Add selftests for the newly introduced context detection kfuncs.

The tests verify that each kfunc correctly identifies its respective
execution context by triggering different contexts

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
---
 .../selftests/bpf/prog_tests/context.c        | 32 ++++++++++++++++++
 .../selftests/bpf/progs/context_prog.c        | 33 +++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/context.c
 create mode 100644 tools/testing/selftests/bpf/progs/context_prog.c

diff --git a/tools/testing/selftests/bpf/prog_tests/context.c b/tools/testing/selftests/bpf/prog_tests/context.c
new file mode 100644
index 000000000000..f09d24069941
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/context.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <error.h>
+#include <test_progs.h>
+#include "context_prog.skel.h"
+
+void test_context(void)
+{
+	struct context_prog *skel = NULL;
+
+	skel = context_prog__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "loading prog fail"))
+		return;
+
+	context_prog__attach(skel);
+	getuid();
+	sleep(5);
+
+	if (!ASSERT_EQ(1, skel->bss->in_hardirq, "hardirq not triggered"))
+		goto out;
+	if (!ASSERT_EQ(1, skel->bss->in_softriq, "softirq not triggered"))
+		goto out;
+	if (!ASSERT_EQ(1, skel->bss->in_task, "task context not triggered"))
+		goto out;
+out:
+	context_prog__destroy(skel);
+}
+
+void test_bpf_context(void)
+{
+	if (test__start_subtest("context"))
+		test_context();
+}
diff --git a/tools/testing/selftests/bpf/progs/context_prog.c b/tools/testing/selftests/bpf/progs/context_prog.c
new file mode 100644
index 000000000000..81e21f684a84
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/context_prog.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <vmlinux.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "bpf_misc.h"
+#include "bpf_experimental.h"
+
+int in_hardirq = 0;
+int in_softriq = 0;
+int in_task = 0;
+
+SEC("tp/irq/irq_handler_entry")
+int trace_irq_handler_entry(const void *ctx)
+{
+	in_hardirq = bpf_in_hardirq_context();
+	return 0;
+}
+
+SEC("tp/irq/softirq_entry")
+int trace_softirq_entry(const void *ctx)
+{
+	in_softriq = bpf_in_softirq_context();
+	return 0;
+}
+
+SEC("tp/syscalls/sys_enter_getuid")
+int trace_syscall(const void *ctx)
+{
+	in_task = bpf_in_task_context();
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";
-- 
2.43.0