tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/rcu_read_lock.c
Extension
.c
Size
4313 bytes
Lines
160
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates.*/

#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <test_progs.h>
#include <bpf/btf.h>
#include "rcu_read_lock.skel.h"
#include "cgroup_helpers.h"

static unsigned long long cgroup_id;

static void test_success(void)
{
	struct rcu_read_lock *skel;
	int err;

	skel = rcu_read_lock__open();
	if (!ASSERT_OK_PTR(skel, "skel_open"))
		return;

	skel->bss->target_pid = sys_gettid();

	bpf_program__set_autoload(skel->progs.get_cgroup_id, true);
	bpf_program__set_autoload(skel->progs.task_succ, true);
	bpf_program__set_autoload(skel->progs.two_regions, true);
	bpf_program__set_autoload(skel->progs.non_sleepable_1, true);
	bpf_program__set_autoload(skel->progs.non_sleepable_2, true);
	bpf_program__set_autoload(skel->progs.nested_rcu_region, true);
	bpf_program__set_autoload(skel->progs.task_trusted_non_rcuptr, true);
	bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog, true);
	bpf_program__set_autoload(skel->progs.rcu_read_lock_global_subprog, true);
	bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog_lock, true);
	bpf_program__set_autoload(skel->progs.rcu_read_lock_subprog_unlock, true);
	err = rcu_read_lock__load(skel);
	if (!ASSERT_OK(err, "skel_load"))
		goto out;

	err = rcu_read_lock__attach(skel);
	if (!ASSERT_OK(err, "skel_attach"))
		goto out;

	syscall(SYS_getpgid);

	ASSERT_EQ(skel->bss->task_storage_val, 2, "task_storage_val");
	ASSERT_EQ(skel->bss->cgroup_id, cgroup_id, "cgroup_id");
out:
	rcu_read_lock__destroy(skel);
}

static void test_rcuptr_acquire(void)
{
	struct rcu_read_lock *skel;
	int err;

	skel = rcu_read_lock__open();
	if (!ASSERT_OK_PTR(skel, "skel_open"))
		return;

	skel->bss->target_pid = sys_gettid();

	bpf_program__set_autoload(skel->progs.task_acquire, true);
	err = rcu_read_lock__load(skel);
	if (!ASSERT_OK(err, "skel_load"))
		goto out;

	err = rcu_read_lock__attach(skel);
	ASSERT_OK(err, "skel_attach");
out:
	rcu_read_lock__destroy(skel);
}

static const char * const inproper_region_tests[] = {
	"miss_lock",
	"no_lock",
	"miss_unlock",
	"non_sleepable_rcu_mismatch",
	"inproper_sleepable_helper",
	"inproper_sleepable_kfunc",
	"nested_rcu_region_unbalanced_1",
	"nested_rcu_region_unbalanced_2",
	"rcu_read_lock_global_subprog_lock",
	"rcu_read_lock_global_subprog_unlock",
	"rcu_read_lock_sleepable_helper_global_subprog",
	"rcu_read_lock_sleepable_kfunc_global_subprog",
	"rcu_read_lock_sleepable_global_subprog_indirect",
};

Annotation

Implementation Notes