drivers/of/selftest.c

   1 /*
   2  * Self tests for device tree subsystem
   3  */
   4
   5 #define pr_fmt(fmt) "### %s(): " fmt, __func__
   6
   7 #include <linux/clk.h>
   8 #include <linux/err.h>
   9 #include <linux/errno.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/list.h>
  13 #include <linux/mutex.h>
  14 #include <linux/slab.h>
  15 #include <linux/device.h>
  16
  17 static bool selftest_passed = true;
  18 #define selftest(result, fmt, ...) { \
  19         selftest_passed &= (result); \
  20         if (!(result)) \
  21                 pr_err("FAIL %s:%i " fmt, __FILE__, __LINE__, ##__VA_ARGS__); \
  22 }
  23
  24 static void __init of_selftest_parse_phandle_with_args(void)
  25 {
  26         struct device_node *np;
  27         struct of_phandle_args args;
  28         int rc, i;
  29         bool passed_all = true;
  30
  31         pr_info("start\n");
  32         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  33         if (!np) {
  34                 pr_err("missing testcase data\n");
  35                 return;
  36         }
  37
  38         for (i = 0; i < 7; i++) {
  39                 bool passed = true;
  40                 rc = of_parse_phandle_with_args(np, "phandle-list",
  41                                                 "#phandle-cells", i, &args);
  42
  43                 /* Test the values from tests-phandle.dtsi */
  44                 switch (i) {
  45                 case 0:
  46                         passed &= !rc;
  47                         passed &= (args.args_count == 1);
  48                         passed &= (args.args[0] == (i + 1));
  49                         break;
  50                 case 1:
  51                         passed &= !rc;
  52                         passed &= (args.args_count == 2);
  53                         passed &= (args.args[0] == (i + 1));
  54                         passed &= (args.args[1] == 0);
  55                         break;
  56                 case 2:
  57                         passed &= (rc == -ENOENT);
  58                         break;
  59                 case 3:
  60                         passed &= !rc;
  61                         passed &= (args.args_count == 3);
  62                         passed &= (args.args[0] == (i + 1));
  63                         passed &= (args.args[1] == 4);
  64                         passed &= (args.args[2] == 3);
  65                         break;
  66                 case 4:
  67                         passed &= !rc;
  68                         passed &= (args.args_count == 2);
  69                         passed &= (args.args[0] == (i + 1));
  70                         passed &= (args.args[1] == 100);
  71                         break;
  72                 case 5:
  73                         passed &= !rc;
  74                         passed &= (args.args_count == 0);
  75                         break;
  76                 case 6:
  77                         passed &= !rc;
  78                         passed &= (args.args_count == 1);
  79                         passed &= (args.args[0] == (i + 1));
  80                         break;
  81                 case 7:
  82                         passed &= (rc == -EINVAL);
  83                         break;
  84                 default:
  85                         passed = false;
  86                 }
  87
  88                 if (!passed) {
  89                         int j;
  90                         pr_err("index %i - data error on node %s rc=%i regs=[",
  91                                 i, args.np->full_name, rc);
  92                         for (j = 0; j < args.args_count; j++)
  93                                 printk(" %i", args.args[j]);
  94                         printk(" ]\n");
  95
  96                         passed_all = false;
  97                 }
  98         }
  99
 100         /* Check for missing list property */
 101         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 102                                         "#phandle-cells", 0, &args);
 103         passed_all &= (rc == -EINVAL);
 104
 105         /* Check for missing cells property */
 106         rc = of_parse_phandle_with_args(np, "phandle-list",
 107                                         "#phandle-cells-missing", 0, &args);
 108         passed_all &= (rc == -EINVAL);
 109
 110         /* Check for bad phandle in list */
 111         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 112                                         "#phandle-cells", 0, &args);
 113         passed_all &= (rc == -EINVAL);
 114
 115         /* Check for incorrectly formed argument list */
 116         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 117                                         "#phandle-cells", 1, &args);
 118         passed_all &= (rc == -EINVAL);
 119
 120         pr_info("end - %s\n", passed_all ? "PASS" : "FAIL");
 121 }
 122
 123 static void __init of_selftest_property_match_string(void)
 124 {
 125         struct device_node *np;
 126         int rc;
 127
 128         pr_info("start\n");
 129         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 130         if (!np) {
 131                 pr_err("No testcase data in device tree\n");
 132                 return;
 133         }
 134
 135         rc = of_property_match_string(np, "phandle-list-names", "first");
 136         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 137         rc = of_property_match_string(np, "phandle-list-names", "second");
 138         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 139         rc = of_property_match_string(np, "phandle-list-names", "third");
 140         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 141         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 142         selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
 143         rc = of_property_match_string(np, "missing-property", "blah");
 144         selftest(rc == -EINVAL, "missing property; rc=%i", rc);
 145         rc = of_property_match_string(np, "empty-property", "blah");
 146         selftest(rc == -ENODATA, "empty property; rc=%i", rc);
 147         rc = of_property_match_string(np, "unterminated-string", "blah");
 148         selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
 149 }
 150
 151 static int __init of_selftest(void)
 152 {
 153         struct device_node *np;
 154
 155         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 156         if (!np) {
 157                 pr_info("No testcase data in device tree; not running tests\n");
 158                 return 0;
 159         }
 160         of_node_put(np);
 161
 162         pr_info("start of selftest - you will see error messages\n");
 163         of_selftest_parse_phandle_with_args();
 164         of_selftest_property_match_string();
 165         pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
 166         return 0;
 167 }
 168 late_initcall(of_selftest);