Commit 88a3bde4 authored by Leon Hwang's avatar Leon Hwang Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add case to test bpf_in_interrupt() 



Add a timer test case to test 'bpf_in_interrupt()'.

cd tools/testing/selftests/bpf
./test_progs -t timer_interrupt
462     timer_interrupt:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: default avatarLeon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20250903140438.59517-3-leon.hwang@linux.dev


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 4b69e313

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

+30 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
#include <test_progs.h>

#include "timer.skel.h"

#include "timer_failure.skel.h"

#include "timer_interrupt.skel.h"



#define NUM_THR 8
@@ -95,3 +96,32 @@ void serial_test_timer(void) 


	RUN_TESTS(timer_failure);

}



void test_timer_interrupt(void)

{

	struct timer_interrupt *skel = NULL;

	int err, prog_fd;

	LIBBPF_OPTS(bpf_test_run_opts, opts);



	skel = timer_interrupt__open_and_load();

	if (!ASSERT_OK_PTR(skel, "timer_interrupt__open_and_load"))

		return;



	err = timer_interrupt__attach(skel);

	if (!ASSERT_OK(err, "timer_interrupt__attach"))

		goto out;



	prog_fd = bpf_program__fd(skel->progs.test_timer_interrupt);

	err = bpf_prog_test_run_opts(prog_fd, &opts);

	if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))

		goto out;



	usleep(50);



	ASSERT_EQ(skel->bss->in_interrupt, 0, "in_interrupt");

	if (skel->bss->preempt_count)

		ASSERT_NEQ(skel->bss->in_interrupt_cb, 0, "in_interrupt_cb");



out:

	timer_interrupt__destroy(skel);

}

tools/testing/selftests/bpf/progs/timer_interrupt.c

0 → 100644
+48 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <vmlinux.h>

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include "bpf_experimental.h"



char _license[] SEC("license") = "GPL";



#define CLOCK_MONOTONIC		1



int preempt_count;

int in_interrupt;

int in_interrupt_cb;



struct elem {

	struct bpf_timer t;

};



struct {

	__uint(type, BPF_MAP_TYPE_ARRAY);

	__uint(max_entries, 1);

	__type(key, int);

	__type(value, struct elem);

} array SEC(".maps");



static int timer_in_interrupt(void *map, int *key, struct bpf_timer *timer)

{

	preempt_count = get_preempt_count();

	in_interrupt_cb = bpf_in_interrupt();

	return 0;

}



SEC("fentry/bpf_fentry_test1")

int BPF_PROG(test_timer_interrupt)

{

	struct bpf_timer *timer;

	int key = 0;



	timer = bpf_map_lookup_elem(&array, &key);

	if (!timer)

		return 0;



	in_interrupt = bpf_in_interrupt();

	bpf_timer_init(timer, &array, CLOCK_MONOTONIC);

	bpf_timer_set_callback(timer, timer_in_interrupt);

	bpf_timer_start(timer, 0, 0);

	return 0;

}