1 /* SPDX-License-Identifier: MIT */
2
3 /*
4 * Copyright © 2019 Intel Corporation
5 */
6
7 #include <linux/compiler.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/sched/signal.h>
11 #include <linux/slab.h>
12
13 #include "selftest.h"
14
15 enum {
16 #define selftest(n, func) __idx_##n,
17 #include "selftests.h"
18 #undef selftest
19 };
20
21 #define selftest(n, f) [__idx_##n] = { .name = #n, .func = f },
22 static struct selftest {
23 bool enabled;
24 const char *name;
25 int (*func)(void);
26 } selftests[] = {
27 #include "selftests.h"
28 };
29 #undef selftest
30
31 /* Embed the line number into the parameter name so that we can order tests */
32 #define param(n) __PASTE(igt__, __PASTE(__PASTE(__LINE__, __), n))
33 #define selftest_0(n, func, id) \
34 module_param_named(id, selftests[__idx_##n].enabled, bool, 0400);
35 #define selftest(n, func) selftest_0(n, func, param(n))
36 #include "selftests.h"
37 #undef selftest
38
__sanitycheck__(void)39 int __sanitycheck__(void)
40 {
41 pr_debug("Hello World!\n");
42 return 0;
43 }
44
45 static char *__st_filter;
46
apply_subtest_filter(const char * caller,const char * name)47 static bool apply_subtest_filter(const char *caller, const char *name)
48 {
49 char *filter, *sep, *tok;
50 bool result = true;
51
52 filter = kstrdup(__st_filter, GFP_KERNEL);
53 for (sep = filter; (tok = strsep(&sep, ","));) {
54 bool allow = true;
55 char *sl;
56
57 if (*tok == '!') {
58 allow = false;
59 tok++;
60 }
61
62 if (*tok == '\0')
63 continue;
64
65 sl = strchr(tok, '/');
66 if (sl) {
67 *sl++ = '\0';
68 if (strcmp(tok, caller)) {
69 if (allow)
70 result = false;
71 continue;
72 }
73 tok = sl;
74 }
75
76 if (strcmp(tok, name)) {
77 if (allow)
78 result = false;
79 continue;
80 }
81
82 result = allow;
83 break;
84 }
85 kfree(filter);
86
87 return result;
88 }
89
90 int
__subtests(const char * caller,const struct subtest * st,int count,void * data)91 __subtests(const char *caller, const struct subtest *st, int count, void *data)
92 {
93 int err;
94
95 for (; count--; st++) {
96 cond_resched();
97 if (signal_pending(current))
98 return -EINTR;
99
100 if (!apply_subtest_filter(caller, st->name))
101 continue;
102
103 pr_info("dma-buf: Running %s/%s\n", caller, st->name);
104
105 err = st->func(data);
106 if (err && err != -EINTR) {
107 pr_err("dma-buf/%s: %s failed with error %d\n",
108 caller, st->name, err);
109 return err;
110 }
111 }
112
113 return 0;
114 }
115
set_default_test_all(struct selftest * st,unsigned long count)116 static void set_default_test_all(struct selftest *st, unsigned long count)
117 {
118 unsigned long i;
119
120 for (i = 0; i < count; i++)
121 if (st[i].enabled)
122 return;
123
124 for (i = 0; i < count; i++)
125 st[i].enabled = true;
126 }
127
run_selftests(struct selftest * st,unsigned long count)128 static int run_selftests(struct selftest *st, unsigned long count)
129 {
130 int err = 0;
131
132 set_default_test_all(st, count);
133
134 /* Tests are listed in natural order in selftests.h */
135 for (; count--; st++) {
136 if (!st->enabled)
137 continue;
138
139 pr_info("dma-buf: Running %s\n", st->name);
140 err = st->func();
141 if (err)
142 break;
143 }
144
145 if (WARN(err > 0 || err == -ENOTTY,
146 "%s returned %d, conflicting with selftest's magic values!\n",
147 st->name, err))
148 err = -1;
149
150 return err;
151 }
152
st_init(void)153 static int __init st_init(void)
154 {
155 return run_selftests(selftests, ARRAY_SIZE(selftests));
156 }
157
st_exit(void)158 static void __exit st_exit(void)
159 {
160 }
161
162 module_param_named(st_filter, __st_filter, charp, 0400);
163 module_init(st_init);
164 module_exit(st_exit);
165
166 MODULE_DESCRIPTION("Self-test harness for dma-buf");
167 MODULE_LICENSE("GPL and additional rights");
168