1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2020, Oracle and/or its affiliates. */
 3
 4#include <test_progs.h>
 5
 6#include "trace_printk.lskel.h"
 7
 8#define SEARCHMSG	"testing,testing"
 9
10static void trace_pipe_cb(const char *str, void *data)
11{
12	if (strstr(str, SEARCHMSG) != NULL)
13		(*(int *)data)++;
14}
15
16void serial_test_trace_printk(void)
17{
18	struct trace_printk_lskel__bss *bss;
19	struct trace_printk_lskel *skel;
20	int err = 0, found = 0;
21
22	skel = trace_printk_lskel__open();
23	if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
24		return;
25
26	ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
27	skel->rodata->fmt[0] = 't';
28
29	err = trace_printk_lskel__load(skel);
30	if (!ASSERT_OK(err, "trace_printk__load"))
31		goto cleanup;
32
33	bss = skel->bss;
34
35	err = trace_printk_lskel__attach(skel);
36	if (!ASSERT_OK(err, "trace_printk__attach"))
37		goto cleanup;
38
39	/* wait for tracepoint to trigger */
40	usleep(1);
41	trace_printk_lskel__detach(skel);
42
43	if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
44		goto cleanup;
45
46	if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
47		goto cleanup;
48
49	/* verify our search string is in the trace buffer */
50	ASSERT_OK(read_trace_pipe_iter(trace_pipe_cb, &found, 1000),
51		 "read_trace_pipe_iter");
52
53	if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
54		goto cleanup;
55
56cleanup:
57	trace_printk_lskel__destroy(skel);
58}