1 files changed, 107 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/task_work.c b/tools/testing/selftests/bpf/progs/task_work.c
new file mode 100644
index 000000000000..23217f06a3ec
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/task_work.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
+
+#include <vmlinux.h>
+#include <string.h>
+#include <stdbool.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "bpf_misc.h"
+#include "errno.h"
+
+char _license[] SEC("license") = "GPL";
+
+const void *user_ptr = NULL;
+
+struct elem {
+	char data[128];
+	struct bpf_task_work tw;
+};
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(map_flags, BPF_F_NO_PREALLOC);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct elem);
+} hmap SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct elem);
+} arrmap SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_LRU_HASH);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct elem);
+} lrumap SEC(".maps");
+
+static int process_work(struct bpf_map *map, void *key, void *value)
+{
+	struct elem *work = value;
+
+	bpf_copy_from_user_str(work->data, sizeof(work->data), (const void *)user_ptr, 0);
+	return 0;
+}
+
+int key = 0;
+
+SEC("perf_event")
+int oncpu_hash_map(struct pt_regs *args)
+{
+	struct elem empty_work = { .data = { 0 } };
+	struct elem *work;
+	struct task_struct *task;
+	int err;
+
+	task = bpf_get_current_task_btf();
+	err = bpf_map_update_elem(&hmap, &key, &empty_work, BPF_NOEXIST);
+	if (err)
+		return 0;
+	work = bpf_map_lookup_elem(&hmap, &key);
+	if (!work)
+		return 0;
+
+	bpf_task_work_schedule_resume(task, &work->tw, &hmap, process_work, NULL);
+	return 0;
+}
+
+SEC("perf_event")
+int oncpu_array_map(struct pt_regs *args)
+{
+	struct elem *work;
+	struct task_struct *task;
+
+	task = bpf_get_current_task_btf();
+	work = bpf_map_lookup_elem(&arrmap, &key);
+	if (!work)
+		return 0;
+	bpf_task_work_schedule_signal(task, &work->tw, &arrmap, process_work, NULL);
+	return 0;
+}
+
+SEC("perf_event")
+int oncpu_lru_map(struct pt_regs *args)
+{
+	struct elem empty_work = { .data = { 0 } };
+	struct elem *work;
+	struct task_struct *task;
+	int err;
+
+	task = bpf_get_current_task_btf();
+	work = bpf_map_lookup_elem(&lrumap, &key);
+	if (work)
+		return 0;
+	err = bpf_map_update_elem(&lrumap, &key, &empty_work, BPF_NOEXIST);
+	if (err)
+		return 0;
+	work = bpf_map_lookup_elem(&lrumap, &key);
+	if (!work || work->data[0])
+		return 0;
+	bpf_task_work_schedule_resume(task, &work->tw, &lrumap, process_work, NULL);
+	return 0;
+}