tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}