drivers/dma-buf/selftest.c

   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
  39 int __sanitycheck__(void)
  40 {
  41         pr_debug("Hello World!\n");
  42         return 0;
  43 }
  44
  45 static char *__st_filter;
  46
  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
  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
 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
 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
 153 static int __init st_init(void)
 154 {
 155         return run_selftests(selftests, ARRAY_SIZE(selftests));
 156 }
 157
 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");