drivers/of/unittest.c

   1 /*
   2  * Self tests for device tree subsystem
   3  */
   4
   5 #define pr_fmt(fmt) "### dt-test ### " fmt
   6
   7 #include <linux/clk.h>
   8 #include <linux/err.h>
   9 #include <linux/errno.h>
  10 #include <linux/hashtable.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/list.h>
  17 #include <linux/mutex.h>
  18 #include <linux/slab.h>
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/of_platform.h>
  22
  23 #include "of_private.h"
  24
  25 static struct selftest_results {
  26         int passed;
  27         int failed;
  28 } selftest_results;
  29
  30 #define selftest(result, fmt, ...) ({ \
  31         bool failed = !(result); \
  32         if (failed) { \
  33                 selftest_results.failed++; \
  34                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  35         } else { \
  36                 selftest_results.passed++; \
  37                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  38         } \
  39         failed; \
  40 })
  41
  42 static void __init of_selftest_find_node_by_name(void)
  43 {
  44         struct device_node *np;
  45         const char *options;
  46
  47         np = of_find_node_by_path("/testcase-data");
  48         selftest(np && !strcmp("/testcase-data", np->full_name),
  49                 "find /testcase-data failed\n");
  50         of_node_put(np);
  51
  52         /* Test if trailing '/' works */
  53         np = of_find_node_by_path("/testcase-data/");
  54         selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
  55
  56         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  57         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  58                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  59         of_node_put(np);
  60
  61         np = of_find_node_by_path("testcase-alias");
  62         selftest(np && !strcmp("/testcase-data", np->full_name),
  63                 "find testcase-alias failed\n");
  64         of_node_put(np);
  65
  66         /* Test if trailing '/' works on aliases */
  67         np = of_find_node_by_path("testcase-alias/");
  68         selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
  69
  70         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  71         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  72                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  73         of_node_put(np);
  74
  75         np = of_find_node_by_path("/testcase-data/missing-path");
  76         selftest(!np, "non-existent path returned node %s\n", np->full_name);
  77         of_node_put(np);
  78
  79         np = of_find_node_by_path("missing-alias");
  80         selftest(!np, "non-existent alias returned node %s\n", np->full_name);
  81         of_node_put(np);
  82
  83         np = of_find_node_by_path("testcase-alias/missing-path");
  84         selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  85         of_node_put(np);
  86
  87         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
  88         selftest(np && !strcmp("testoption", options),
  89                  "option path test failed\n");
  90         of_node_put(np);
  91
  92         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
  93         selftest(np, "NULL option path test failed\n");
  94         of_node_put(np);
  95
  96         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
  97                                        &options);
  98         selftest(np && !strcmp("testaliasoption", options),
  99                  "option alias path test failed\n");
 100         of_node_put(np);
 101
 102         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 103         selftest(np, "NULL option alias path test failed\n");
 104         of_node_put(np);
 105
 106         options = "testoption";
 107         np = of_find_node_opts_by_path("testcase-alias", &options);
 108         selftest(np && !options, "option clearing test failed\n");
 109         of_node_put(np);
 110
 111         options = "testoption";
 112         np = of_find_node_opts_by_path("/", &options);
 113         selftest(np && !options, "option clearing root node test failed\n");
 114         of_node_put(np);
 115 }
 116
 117 static void __init of_selftest_dynamic(void)
 118 {
 119         struct device_node *np;
 120         struct property *prop;
 121
 122         np = of_find_node_by_path("/testcase-data");
 123         if (!np) {
 124                 pr_err("missing testcase data\n");
 125                 return;
 126         }
 127
 128         /* Array of 4 properties for the purpose of testing */
 129         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 130         if (!prop) {
 131                 selftest(0, "kzalloc() failed\n");
 132                 return;
 133         }
 134
 135         /* Add a new property - should pass*/
 136         prop->name = "new-property";
 137         prop->value = "new-property-data";
 138         prop->length = strlen(prop->value);
 139         selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 140
 141         /* Try to add an existing property - should fail */
 142         prop++;
 143         prop->name = "new-property";
 144         prop->value = "new-property-data-should-fail";
 145         prop->length = strlen(prop->value);
 146         selftest(of_add_property(np, prop) != 0,
 147                  "Adding an existing property should have failed\n");
 148
 149         /* Try to modify an existing property - should pass */
 150         prop->value = "modify-property-data-should-pass";
 151         prop->length = strlen(prop->value);
 152         selftest(of_update_property(np, prop) == 0,
 153                  "Updating an existing property should have passed\n");
 154
 155         /* Try to modify non-existent property - should pass*/
 156         prop++;
 157         prop->name = "modify-property";
 158         prop->value = "modify-missing-property-data-should-pass";
 159         prop->length = strlen(prop->value);
 160         selftest(of_update_property(np, prop) == 0,
 161                  "Updating a missing property should have passed\n");
 162
 163         /* Remove property - should pass */
 164         selftest(of_remove_property(np, prop) == 0,
 165                  "Removing a property should have passed\n");
 166
 167         /* Adding very large property - should pass */
 168         prop++;
 169         prop->name = "large-property-PAGE_SIZEx8";
 170         prop->length = PAGE_SIZE * 8;
 171         prop->value = kzalloc(prop->length, GFP_KERNEL);
 172         selftest(prop->value != NULL, "Unable to allocate large buffer\n");
 173         if (prop->value)
 174                 selftest(of_add_property(np, prop) == 0,
 175                          "Adding a large property should have passed\n");
 176 }
 177
 178 static int __init of_selftest_check_node_linkage(struct device_node *np)
 179 {
 180         struct device_node *child;
 181         int count = 0, rc;
 182
 183         for_each_child_of_node(np, child) {
 184                 if (child->parent != np) {
 185                         pr_err("Child node %s links to wrong parent %s\n",
 186                                  child->name, np->name);
 187                         return -EINVAL;
 188                 }
 189
 190                 rc = of_selftest_check_node_linkage(child);
 191                 if (rc < 0)
 192                         return rc;
 193                 count += rc;
 194         }
 195
 196         return count + 1;
 197 }
 198
 199 static void __init of_selftest_check_tree_linkage(void)
 200 {
 201         struct device_node *np;
 202         int allnode_count = 0, child_count;
 203
 204         if (!of_root)
 205                 return;
 206
 207         for_each_of_allnodes(np)
 208                 allnode_count++;
 209         child_count = of_selftest_check_node_linkage(of_root);
 210
 211         selftest(child_count > 0, "Device node data structure is corrupted\n");
 212         selftest(child_count == allnode_count, "allnodes list size (%i) doesn't match"
 213                  "sibling lists size (%i)\n", allnode_count, child_count);
 214         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 215 }
 216
 217 struct node_hash {
 218         struct hlist_node node;
 219         struct device_node *np;
 220 };
 221
 222 static DEFINE_HASHTABLE(phandle_ht, 8);
 223 static void __init of_selftest_check_phandles(void)
 224 {
 225         struct device_node *np;
 226         struct node_hash *nh;
 227         struct hlist_node *tmp;
 228         int i, dup_count = 0, phandle_count = 0;
 229
 230         for_each_of_allnodes(np) {
 231                 if (!np->phandle)
 232                         continue;
 233
 234                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 235                         if (nh->np->phandle == np->phandle) {
 236                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 237                                         np->phandle, nh->np->full_name, np->full_name);
 238                                 dup_count++;
 239                                 break;
 240                         }
 241                 }
 242
 243                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 244                 if (WARN_ON(!nh))
 245                         return;
 246
 247                 nh->np = np;
 248                 hash_add(phandle_ht, &nh->node, np->phandle);
 249                 phandle_count++;
 250         }
 251         selftest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 252                  dup_count, phandle_count);
 253
 254         /* Clean up */
 255         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 256                 hash_del(&nh->node);
 257                 kfree(nh);
 258         }
 259 }
 260
 261 static void __init of_selftest_parse_phandle_with_args(void)
 262 {
 263         struct device_node *np;
 264         struct of_phandle_args args;
 265         int i, rc;
 266
 267         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 268         if (!np) {
 269                 pr_err("missing testcase data\n");
 270                 return;
 271         }
 272
 273         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 274         selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 275
 276         for (i = 0; i < 8; i++) {
 277                 bool passed = true;
 278                 rc = of_parse_phandle_with_args(np, "phandle-list",
 279                                                 "#phandle-cells", i, &args);
 280
 281                 /* Test the values from tests-phandle.dtsi */
 282                 switch (i) {
 283                 case 0:
 284                         passed &= !rc;
 285                         passed &= (args.args_count == 1);
 286                         passed &= (args.args[0] == (i + 1));
 287                         break;
 288                 case 1:
 289                         passed &= !rc;
 290                         passed &= (args.args_count == 2);
 291                         passed &= (args.args[0] == (i + 1));
 292                         passed &= (args.args[1] == 0);
 293                         break;
 294                 case 2:
 295                         passed &= (rc == -ENOENT);
 296                         break;
 297                 case 3:
 298                         passed &= !rc;
 299                         passed &= (args.args_count == 3);
 300                         passed &= (args.args[0] == (i + 1));
 301                         passed &= (args.args[1] == 4);
 302                         passed &= (args.args[2] == 3);
 303                         break;
 304                 case 4:
 305                         passed &= !rc;
 306                         passed &= (args.args_count == 2);
 307                         passed &= (args.args[0] == (i + 1));
 308                         passed &= (args.args[1] == 100);
 309                         break;
 310                 case 5:
 311                         passed &= !rc;
 312                         passed &= (args.args_count == 0);
 313                         break;
 314                 case 6:
 315                         passed &= !rc;
 316                         passed &= (args.args_count == 1);
 317                         passed &= (args.args[0] == (i + 1));
 318                         break;
 319                 case 7:
 320                         passed &= (rc == -ENOENT);
 321                         break;
 322                 default:
 323                         passed = false;
 324                 }
 325
 326                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 327                          i, args.np->full_name, rc);
 328         }
 329
 330         /* Check for missing list property */
 331         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 332                                         "#phandle-cells", 0, &args);
 333         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 334         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 335                                         "#phandle-cells");
 336         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 337
 338         /* Check for missing cells property */
 339         rc = of_parse_phandle_with_args(np, "phandle-list",
 340                                         "#phandle-cells-missing", 0, &args);
 341         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 342         rc = of_count_phandle_with_args(np, "phandle-list",
 343                                         "#phandle-cells-missing");
 344         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 345
 346         /* Check for bad phandle in list */
 347         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 348                                         "#phandle-cells", 0, &args);
 349         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 350         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 351                                         "#phandle-cells");
 352         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 353
 354         /* Check for incorrectly formed argument list */
 355         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 356                                         "#phandle-cells", 1, &args);
 357         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 358         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 359                                         "#phandle-cells");
 360         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 361 }
 362
 363 static void __init of_selftest_property_string(void)
 364 {
 365         const char *strings[4];
 366         struct device_node *np;
 367         int rc;
 368
 369         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 370         if (!np) {
 371                 pr_err("No testcase data in device tree\n");
 372                 return;
 373         }
 374
 375         rc = of_property_match_string(np, "phandle-list-names", "first");
 376         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 377         rc = of_property_match_string(np, "phandle-list-names", "second");
 378         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 379         rc = of_property_match_string(np, "phandle-list-names", "third");
 380         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 381         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 382         selftest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 383         rc = of_property_match_string(np, "missing-property", "blah");
 384         selftest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 385         rc = of_property_match_string(np, "empty-property", "blah");
 386         selftest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 387         rc = of_property_match_string(np, "unterminated-string", "blah");
 388         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 389
 390         /* of_property_count_strings() tests */
 391         rc = of_property_count_strings(np, "string-property");
 392         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 393         rc = of_property_count_strings(np, "phandle-list-names");
 394         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 395         rc = of_property_count_strings(np, "unterminated-string");
 396         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 397         rc = of_property_count_strings(np, "unterminated-string-list");
 398         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 399
 400         /* of_property_read_string_index() tests */
 401         rc = of_property_read_string_index(np, "string-property", 0, strings);
 402         selftest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 403         strings[0] = NULL;
 404         rc = of_property_read_string_index(np, "string-property", 1, strings);
 405         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 406         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 407         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 408         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 409         selftest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 410         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 411         selftest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 412         strings[0] = NULL;
 413         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 414         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 415         strings[0] = NULL;
 416         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 417         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 418         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 419         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 420         strings[0] = NULL;
 421         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 422         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 423         strings[1] = NULL;
 424
 425         /* of_property_read_string_array() tests */
 426         rc = of_property_read_string_array(np, "string-property", strings, 4);
 427         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 428         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 429         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 430         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 431         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 432         /* -- An incorrectly formed string should cause a failure */
 433         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 434         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 435         /* -- parsing the correctly formed strings should still work: */
 436         strings[2] = NULL;
 437         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 438         selftest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 439         strings[1] = NULL;
 440         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 441         selftest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 442 }
 443
 444 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 445                         (p1)->value && (p2)->value && \
 446                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 447                         !strcmp((p1)->name, (p2)->name))
 448 static void __init of_selftest_property_copy(void)
 449 {
 450 #ifdef CONFIG_OF_DYNAMIC
 451         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 452         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 453         struct property *new;
 454
 455         new = __of_prop_dup(&p1, GFP_KERNEL);
 456         selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 457         kfree(new->value);
 458         kfree(new->name);
 459         kfree(new);
 460
 461         new = __of_prop_dup(&p2, GFP_KERNEL);
 462         selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 463         kfree(new->value);
 464         kfree(new->name);
 465         kfree(new);
 466 #endif
 467 }
 468
 469 static void __init of_selftest_changeset(void)
 470 {
 471 #ifdef CONFIG_OF_DYNAMIC
 472         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 473         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 474         struct property *ppremove;
 475         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 476         struct of_changeset chgset;
 477
 478         of_changeset_init(&chgset);
 479         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 480         selftest(n1, "testcase setup failure\n");
 481         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 482         selftest(n2, "testcase setup failure\n");
 483         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 484         selftest(n21, "testcase setup failure %p\n", n21);
 485         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 486         selftest(nremove, "testcase setup failure\n");
 487         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 488         selftest(ppadd, "testcase setup failure\n");
 489         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 490         selftest(ppupdate, "testcase setup failure\n");
 491         parent = nremove->parent;
 492         n1->parent = parent;
 493         n2->parent = parent;
 494         n21->parent = n2;
 495         n2->child = n21;
 496         ppremove = of_find_property(parent, "prop-remove", NULL);
 497         selftest(ppremove, "failed to find removal prop");
 498
 499         of_changeset_init(&chgset);
 500         selftest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 501         selftest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 502         selftest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 503         selftest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 504         selftest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 505         selftest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 506         selftest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 507         mutex_lock(&of_mutex);
 508         selftest(!of_changeset_apply(&chgset), "apply failed\n");
 509         mutex_unlock(&of_mutex);
 510
 511         /* Make sure node names are constructed correctly */
 512         selftest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 513                  "'%s' not added\n", n21->full_name);
 514         of_node_put(np);
 515
 516         mutex_lock(&of_mutex);
 517         selftest(!of_changeset_revert(&chgset), "revert failed\n");
 518         mutex_unlock(&of_mutex);
 519
 520         of_changeset_destroy(&chgset);
 521 #endif
 522 }
 523
 524 static void __init of_selftest_parse_interrupts(void)
 525 {
 526         struct device_node *np;
 527         struct of_phandle_args args;
 528         int i, rc;
 529
 530         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 531         if (!np) {
 532                 pr_err("missing testcase data\n");
 533                 return;
 534         }
 535
 536         for (i = 0; i < 4; i++) {
 537                 bool passed = true;
 538                 args.args_count = 0;
 539                 rc = of_irq_parse_one(np, i, &args);
 540
 541                 passed &= !rc;
 542                 passed &= (args.args_count == 1);
 543                 passed &= (args.args[0] == (i + 1));
 544
 545                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 546                          i, args.np->full_name, rc);
 547         }
 548         of_node_put(np);
 549
 550         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 551         if (!np) {
 552                 pr_err("missing testcase data\n");
 553                 return;
 554         }
 555
 556         for (i = 0; i < 4; i++) {
 557                 bool passed = true;
 558                 args.args_count = 0;
 559                 rc = of_irq_parse_one(np, i, &args);
 560
 561                 /* Test the values from tests-phandle.dtsi */
 562                 switch (i) {
 563                 case 0:
 564                         passed &= !rc;
 565                         passed &= (args.args_count == 1);
 566                         passed &= (args.args[0] == 9);
 567                         break;
 568                 case 1:
 569                         passed &= !rc;
 570                         passed &= (args.args_count == 3);
 571                         passed &= (args.args[0] == 10);
 572                         passed &= (args.args[1] == 11);
 573                         passed &= (args.args[2] == 12);
 574                         break;
 575                 case 2:
 576                         passed &= !rc;
 577                         passed &= (args.args_count == 2);
 578                         passed &= (args.args[0] == 13);
 579                         passed &= (args.args[1] == 14);
 580                         break;
 581                 case 3:
 582                         passed &= !rc;
 583                         passed &= (args.args_count == 2);
 584                         passed &= (args.args[0] == 15);
 585                         passed &= (args.args[1] == 16);
 586                         break;
 587                 default:
 588                         passed = false;
 589                 }
 590                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 591                          i, args.np->full_name, rc);
 592         }
 593         of_node_put(np);
 594 }
 595
 596 static void __init of_selftest_parse_interrupts_extended(void)
 597 {
 598         struct device_node *np;
 599         struct of_phandle_args args;
 600         int i, rc;
 601
 602         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 603         if (!np) {
 604                 pr_err("missing testcase data\n");
 605                 return;
 606         }
 607
 608         for (i = 0; i < 7; i++) {
 609                 bool passed = true;
 610                 rc = of_irq_parse_one(np, i, &args);
 611
 612                 /* Test the values from tests-phandle.dtsi */
 613                 switch (i) {
 614                 case 0:
 615                         passed &= !rc;
 616                         passed &= (args.args_count == 1);
 617                         passed &= (args.args[0] == 1);
 618                         break;
 619                 case 1:
 620                         passed &= !rc;
 621                         passed &= (args.args_count == 3);
 622                         passed &= (args.args[0] == 2);
 623                         passed &= (args.args[1] == 3);
 624                         passed &= (args.args[2] == 4);
 625                         break;
 626                 case 2:
 627                         passed &= !rc;
 628                         passed &= (args.args_count == 2);
 629                         passed &= (args.args[0] == 5);
 630                         passed &= (args.args[1] == 6);
 631                         break;
 632                 case 3:
 633                         passed &= !rc;
 634                         passed &= (args.args_count == 1);
 635                         passed &= (args.args[0] == 9);
 636                         break;
 637                 case 4:
 638                         passed &= !rc;
 639                         passed &= (args.args_count == 3);
 640                         passed &= (args.args[0] == 10);
 641                         passed &= (args.args[1] == 11);
 642                         passed &= (args.args[2] == 12);
 643                         break;
 644                 case 5:
 645                         passed &= !rc;
 646                         passed &= (args.args_count == 2);
 647                         passed &= (args.args[0] == 13);
 648                         passed &= (args.args[1] == 14);
 649                         break;
 650                 case 6:
 651                         passed &= !rc;
 652                         passed &= (args.args_count == 1);
 653                         passed &= (args.args[0] == 15);
 654                         break;
 655                 default:
 656                         passed = false;
 657                 }
 658
 659                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 660                          i, args.np->full_name, rc);
 661         }
 662         of_node_put(np);
 663 }
 664
 665 static struct of_device_id match_node_table[] = {
 666         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 667         { .data = "B", .type = "type1", }, /* followed by type alone */
 668
 669         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 670         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 671         { .data = "Cc", .name = "name2", .type = "type2", },
 672
 673         { .data = "E", .compatible = "compat3" },
 674         { .data = "G", .compatible = "compat2", },
 675         { .data = "H", .compatible = "compat2", .name = "name5", },
 676         { .data = "I", .compatible = "compat2", .type = "type1", },
 677         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 678         { .data = "K", .compatible = "compat2", .name = "name9", },
 679         {}
 680 };
 681
 682 static struct {
 683         const char *path;
 684         const char *data;
 685 } match_node_tests[] = {
 686         { .path = "/testcase-data/match-node/name0", .data = "A", },
 687         { .path = "/testcase-data/match-node/name1", .data = "B", },
 688         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 689         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 690         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 691         { .path = "/testcase-data/match-node/name3", .data = "E", },
 692         { .path = "/testcase-data/match-node/name4", .data = "G", },
 693         { .path = "/testcase-data/match-node/name5", .data = "H", },
 694         { .path = "/testcase-data/match-node/name6", .data = "G", },
 695         { .path = "/testcase-data/match-node/name7", .data = "I", },
 696         { .path = "/testcase-data/match-node/name8", .data = "J", },
 697         { .path = "/testcase-data/match-node/name9", .data = "K", },
 698 };
 699
 700 static void __init of_selftest_match_node(void)
 701 {
 702         struct device_node *np;
 703         const struct of_device_id *match;
 704         int i;
 705
 706         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 707                 np = of_find_node_by_path(match_node_tests[i].path);
 708                 if (!np) {
 709                         selftest(0, "missing testcase node %s\n",
 710                                 match_node_tests[i].path);
 711                         continue;
 712                 }
 713
 714                 match = of_match_node(match_node_table, np);
 715                 if (!match) {
 716                         selftest(0, "%s didn't match anything\n",
 717                                 match_node_tests[i].path);
 718                         continue;
 719                 }
 720
 721                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 722                         selftest(0, "%s got wrong match. expected %s, got %s\n",
 723                                 match_node_tests[i].path, match_node_tests[i].data,
 724                                 (const char *)match->data);
 725                         continue;
 726                 }
 727                 selftest(1, "passed");
 728         }
 729 }
 730
 731 struct device test_bus = {
 732         .init_name = "unittest-bus",
 733 };
 734 static void __init of_selftest_platform_populate(void)
 735 {
 736         int irq, rc;
 737         struct device_node *np, *child, *grandchild;
 738         struct platform_device *pdev;
 739         struct of_device_id match[] = {
 740                 { .compatible = "test-device", },
 741                 {}
 742         };
 743
 744         np = of_find_node_by_path("/testcase-data");
 745         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 746
 747         /* Test that a missing irq domain returns -EPROBE_DEFER */
 748         np = of_find_node_by_path("/testcase-data/testcase-device1");
 749         pdev = of_find_device_by_node(np);
 750         selftest(pdev, "device 1 creation failed\n");
 751
 752         irq = platform_get_irq(pdev, 0);
 753         selftest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 754
 755         /* Test that a parsing failure does not return -EPROBE_DEFER */
 756         np = of_find_node_by_path("/testcase-data/testcase-device2");
 757         pdev = of_find_device_by_node(np);
 758         selftest(pdev, "device 2 creation failed\n");
 759         irq = platform_get_irq(pdev, 0);
 760         selftest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 761
 762         if (selftest(np = of_find_node_by_path("/testcase-data/platform-tests"),
 763                      "No testcase data in device tree\n"));
 764                 return;
 765
 766         if (selftest(!(rc = device_register(&test_bus)),
 767                      "testbus registration failed; rc=%i\n", rc));
 768                 return;
 769
 770         for_each_child_of_node(np, child) {
 771                 of_platform_populate(child, match, NULL, &test_bus);
 772                 for_each_child_of_node(child, grandchild)
 773                         selftest(of_find_device_by_node(grandchild),
 774                                  "Could not create device for node '%s'\n",
 775                                  grandchild->name);
 776         }
 777
 778         of_platform_depopulate(&test_bus);
 779         for_each_child_of_node(np, child) {
 780                 for_each_child_of_node(child, grandchild)
 781                         selftest(!of_find_device_by_node(grandchild),
 782                                  "device didn't get destroyed '%s'\n",
 783                                  grandchild->name);
 784         }
 785
 786         device_unregister(&test_bus);
 787         of_node_put(np);
 788 }
 789
 790 /**
 791  *      update_node_properties - adds the properties
 792  *      of np into dup node (present in live tree) and
 793  *      updates parent of children of np to dup.
 794  *
 795  *      @np:    node already present in live tree
 796  *      @dup:   node present in live tree to be updated
 797  */
 798 static void update_node_properties(struct device_node *np,
 799                                         struct device_node *dup)
 800 {
 801         struct property *prop;
 802         struct device_node *child;
 803
 804         for_each_property_of_node(np, prop)
 805                 of_add_property(dup, prop);
 806
 807         for_each_child_of_node(np, child)
 808                 child->parent = dup;
 809 }
 810
 811 /**
 812  *      attach_node_and_children - attaches nodes
 813  *      and its children to live tree
 814  *
 815  *      @np:    Node to attach to live tree
 816  */
 817 static int attach_node_and_children(struct device_node *np)
 818 {
 819         struct device_node *next, *dup, *child;
 820         unsigned long flags;
 821
 822         dup = of_find_node_by_path(np->full_name);
 823         if (dup) {
 824                 update_node_properties(np, dup);
 825                 return 0;
 826         }
 827
 828         child = np->child;
 829         np->child = NULL;
 830
 831         mutex_lock(&of_mutex);
 832         raw_spin_lock_irqsave(&devtree_lock, flags);
 833         np->sibling = np->parent->child;
 834         np->parent->child = np;
 835         of_node_clear_flag(np, OF_DETACHED);
 836         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 837
 838         __of_attach_node_sysfs(np);
 839         mutex_unlock(&of_mutex);
 840
 841         while (child) {
 842                 next = child->sibling;
 843                 attach_node_and_children(child);
 844                 child = next;
 845         }
 846
 847         return 0;
 848 }
 849
 850 /**
 851  *      selftest_data_add - Reads, copies data from
 852  *      linked tree and attaches it to the live tree
 853  */
 854 static int __init selftest_data_add(void)
 855 {
 856         void *selftest_data;
 857         struct device_node *selftest_data_node, *np;
 858         extern uint8_t __dtb_testcases_begin[];
 859         extern uint8_t __dtb_testcases_end[];
 860         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 861         int rc;
 862
 863         if (!size) {
 864                 pr_warn("%s: No testcase data to attach; not running tests\n",
 865                         __func__);
 866                 return -ENODATA;
 867         }
 868
 869         /* creating copy */
 870         selftest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 871
 872         if (!selftest_data) {
 873                 pr_warn("%s: Failed to allocate memory for selftest_data; "
 874                         "not running tests\n", __func__);
 875                 return -ENOMEM;
 876         }
 877         of_fdt_unflatten_tree(selftest_data, &selftest_data_node);
 878         if (!selftest_data_node) {
 879                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 880                 return -ENODATA;
 881         }
 882         of_node_set_flag(selftest_data_node, OF_DETACHED);
 883         rc = of_resolve_phandles(selftest_data_node);
 884         if (rc) {
 885                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 886                 return -EINVAL;
 887         }
 888
 889         if (!of_root) {
 890                 of_root = selftest_data_node;
 891                 for_each_of_allnodes(np)
 892                         __of_attach_node_sysfs(np);
 893                 of_aliases = of_find_node_by_path("/aliases");
 894                 of_chosen = of_find_node_by_path("/chosen");
 895                 return 0;
 896         }
 897
 898         /* attach the sub-tree to live tree */
 899         np = selftest_data_node->child;
 900         while (np) {
 901                 struct device_node *next = np->sibling;
 902                 np->parent = of_root;
 903                 attach_node_and_children(np);
 904                 np = next;
 905         }
 906         return 0;
 907 }
 908
 909 #ifdef CONFIG_OF_OVERLAY
 910
 911 static int selftest_probe(struct platform_device *pdev)
 912 {
 913         struct device *dev = &pdev->dev;
 914         struct device_node *np = dev->of_node;
 915
 916         if (np == NULL) {
 917                 dev_err(dev, "No OF data for device\n");
 918                 return -EINVAL;
 919
 920         }
 921
 922         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 923         return 0;
 924 }
 925
 926 static int selftest_remove(struct platform_device *pdev)
 927 {
 928         struct device *dev = &pdev->dev;
 929         struct device_node *np = dev->of_node;
 930
 931         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 932         return 0;
 933 }
 934
 935 static struct of_device_id selftest_match[] = {
 936         { .compatible = "selftest", },
 937         {},
 938 };
 939
 940 static struct platform_driver selftest_driver = {
 941         .probe                  = selftest_probe,
 942         .remove                 = selftest_remove,
 943         .driver = {
 944                 .name           = "selftest",
 945                 .owner          = THIS_MODULE,
 946                 .of_match_table = of_match_ptr(selftest_match),
 947         },
 948 };
 949
 950 /* get the platform device instantiated at the path */
 951 static struct platform_device *of_path_to_platform_device(const char *path)
 952 {
 953         struct device_node *np;
 954         struct platform_device *pdev;
 955
 956         np = of_find_node_by_path(path);
 957         if (np == NULL)
 958                 return NULL;
 959
 960         pdev = of_find_device_by_node(np);
 961         of_node_put(np);
 962
 963         return pdev;
 964 }
 965
 966 /* find out if a platform device exists at that path */
 967 static int of_path_platform_device_exists(const char *path)
 968 {
 969         struct platform_device *pdev;
 970
 971         pdev = of_path_to_platform_device(path);
 972         platform_device_put(pdev);
 973         return pdev != NULL;
 974 }
 975
 976 static const char *selftest_path(int nr)
 977 {
 978         static char buf[256];
 979
 980         snprintf(buf, sizeof(buf) - 1,
 981                 "/testcase-data/overlay-node/test-bus/test-selftest%d", nr);
 982         buf[sizeof(buf) - 1] = '\0';
 983
 984         return buf;
 985 }
 986
 987 static const char *overlay_path(int nr)
 988 {
 989         static char buf[256];
 990
 991         snprintf(buf, sizeof(buf) - 1,
 992                 "/testcase-data/overlay%d", nr);
 993         buf[sizeof(buf) - 1] = '\0';
 994
 995         return buf;
 996 }
 997
 998 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
 999
1000 static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
1001                 int *overlay_id)
1002 {
1003         struct device_node *np = NULL;
1004         int ret, id = -1;
1005
1006         np = of_find_node_by_path(overlay_path(overlay_nr));
1007         if (np == NULL) {
1008                 selftest(0, "could not find overlay node @\"%s\"\n",
1009                                 overlay_path(overlay_nr));
1010                 ret = -EINVAL;
1011                 goto out;
1012         }
1013
1014         ret = of_overlay_create(np);
1015         if (ret < 0) {
1016                 selftest(0, "could not create overlay from \"%s\"\n",
1017                                 overlay_path(overlay_nr));
1018                 goto out;
1019         }
1020         id = ret;
1021
1022         ret = 0;
1023
1024 out:
1025         of_node_put(np);
1026
1027         if (overlay_id)
1028                 *overlay_id = id;
1029
1030         return ret;
1031 }
1032
1033 /* apply an overlay while checking before and after states */
1034 static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
1035                 int before, int after)
1036 {
1037         int ret;
1038
1039         /* selftest device must not be in before state */
1040         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1041                         != before) {
1042                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1043                                 overlay_path(overlay_nr),
1044                                 selftest_path(selftest_nr),
1045                                 !before ? "enabled" : "disabled");
1046                 return -EINVAL;
1047         }
1048
1049         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, NULL);
1050         if (ret != 0) {
1051                 /* of_selftest_apply_overlay already called selftest() */
1052                 return ret;
1053         }
1054
1055         /* selftest device must be to set to after state */
1056         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1057                         != after) {
1058                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1059                                 overlay_path(overlay_nr),
1060                                 selftest_path(selftest_nr),
1061                                 !after ? "enabled" : "disabled");
1062                 return -EINVAL;
1063         }
1064
1065         return 0;
1066 }
1067
1068 /* apply an overlay and then revert it while checking before, after states */
1069 static int of_selftest_apply_revert_overlay_check(int overlay_nr,
1070                 int selftest_nr, int before, int after)
1071 {
1072         int ret, ov_id;
1073
1074         /* selftest device must be in before state */
1075         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1076                         != before) {
1077                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1078                                 overlay_path(overlay_nr),
1079                                 selftest_path(selftest_nr),
1080                                 !before ? "enabled" : "disabled");
1081                 return -EINVAL;
1082         }
1083
1084         /* apply the overlay */
1085         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, &ov_id);
1086         if (ret != 0) {
1087                 /* of_selftest_apply_overlay already called selftest() */
1088                 return ret;
1089         }
1090
1091         /* selftest device must be in after state */
1092         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1093                         != after) {
1094                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1095                                 overlay_path(overlay_nr),
1096                                 selftest_path(selftest_nr),
1097                                 !after ? "enabled" : "disabled");
1098                 return -EINVAL;
1099         }
1100
1101         ret = of_overlay_destroy(ov_id);
1102         if (ret != 0) {
1103                 selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1104                                 overlay_path(overlay_nr),
1105                                 selftest_path(selftest_nr));
1106                 return ret;
1107         }
1108
1109         /* selftest device must be again in before state */
1110         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1111                         != before) {
1112                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1113                                 overlay_path(overlay_nr),
1114                                 selftest_path(selftest_nr),
1115                                 !before ? "enabled" : "disabled");
1116                 return -EINVAL;
1117         }
1118
1119         return 0;
1120 }
1121
1122 /* test activation of device */
1123 static void of_selftest_overlay_0(void)
1124 {
1125         int ret;
1126
1127         /* device should enable */
1128         ret = of_selftest_apply_overlay_check(0, 0, 0, 1);
1129         if (ret != 0)
1130                 return;
1131
1132         selftest(1, "overlay test %d passed\n", 0);
1133 }
1134
1135 /* test deactivation of device */
1136 static void of_selftest_overlay_1(void)
1137 {
1138         int ret;
1139
1140         /* device should disable */
1141         ret = of_selftest_apply_overlay_check(1, 1, 1, 0);
1142         if (ret != 0)
1143                 return;
1144
1145         selftest(1, "overlay test %d passed\n", 1);
1146 }
1147
1148 /* test activation of device */
1149 static void of_selftest_overlay_2(void)
1150 {
1151         int ret;
1152
1153         /* device should enable */
1154         ret = of_selftest_apply_overlay_check(2, 2, 0, 1);
1155         if (ret != 0)
1156                 return;
1157
1158         selftest(1, "overlay test %d passed\n", 2);
1159 }
1160
1161 /* test deactivation of device */
1162 static void of_selftest_overlay_3(void)
1163 {
1164         int ret;
1165
1166         /* device should disable */
1167         ret = of_selftest_apply_overlay_check(3, 3, 1, 0);
1168         if (ret != 0)
1169                 return;
1170
1171         selftest(1, "overlay test %d passed\n", 3);
1172 }
1173
1174 /* test activation of a full device node */
1175 static void of_selftest_overlay_4(void)
1176 {
1177         int ret;
1178
1179         /* device should disable */
1180         ret = of_selftest_apply_overlay_check(4, 4, 0, 1);
1181         if (ret != 0)
1182                 return;
1183
1184         selftest(1, "overlay test %d passed\n", 4);
1185 }
1186
1187 /* test overlay apply/revert sequence */
1188 static void of_selftest_overlay_5(void)
1189 {
1190         int ret;
1191
1192         /* device should disable */
1193         ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1);
1194         if (ret != 0)
1195                 return;
1196
1197         selftest(1, "overlay test %d passed\n", 5);
1198 }
1199
1200 /* test overlay application in sequence */
1201 static void of_selftest_overlay_6(void)
1202 {
1203         struct device_node *np;
1204         int ret, i, ov_id[2];
1205         int overlay_nr = 6, selftest_nr = 6;
1206         int before = 0, after = 1;
1207
1208         /* selftest device must be in before state */
1209         for (i = 0; i < 2; i++) {
1210                 if (of_path_platform_device_exists(
1211                                         selftest_path(selftest_nr + i))
1212                                 != before) {
1213                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1214                                         overlay_path(overlay_nr + i),
1215                                         selftest_path(selftest_nr + i),
1216                                         !before ? "enabled" : "disabled");
1217                         return;
1218                 }
1219         }
1220
1221         /* apply the overlays */
1222         for (i = 0; i < 2; i++) {
1223
1224                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1225                 if (np == NULL) {
1226                         selftest(0, "could not find overlay node @\"%s\"\n",
1227                                         overlay_path(overlay_nr + i));
1228                         return;
1229                 }
1230
1231                 ret = of_overlay_create(np);
1232                 if (ret < 0)  {
1233                         selftest(0, "could not create overlay from \"%s\"\n",
1234                                         overlay_path(overlay_nr + i));
1235                         return;
1236                 }
1237                 ov_id[i] = ret;
1238         }
1239
1240         for (i = 0; i < 2; i++) {
1241                 /* selftest device must be in after state */
1242                 if (of_path_platform_device_exists(
1243                                         selftest_path(selftest_nr + i))
1244                                 != after) {
1245                         selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1246                                         overlay_path(overlay_nr + i),
1247                                         selftest_path(selftest_nr + i),
1248                                         !after ? "enabled" : "disabled");
1249                         return;
1250                 }
1251         }
1252
1253         for (i = 1; i >= 0; i--) {
1254                 ret = of_overlay_destroy(ov_id[i]);
1255                 if (ret != 0) {
1256                         selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1257                                         overlay_path(overlay_nr + i),
1258                                         selftest_path(selftest_nr + i));
1259                         return;
1260                 }
1261         }
1262
1263         for (i = 0; i < 2; i++) {
1264                 /* selftest device must be again in before state */
1265                 if (of_path_platform_device_exists(
1266                                         selftest_path(selftest_nr + i))
1267                                 != before) {
1268                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1269                                         overlay_path(overlay_nr + i),
1270                                         selftest_path(selftest_nr + i),
1271                                         !before ? "enabled" : "disabled");
1272                         return;
1273                 }
1274         }
1275
1276         selftest(1, "overlay test %d passed\n", 6);
1277 }
1278
1279 /* test overlay application in sequence */
1280 static void of_selftest_overlay_8(void)
1281 {
1282         struct device_node *np;
1283         int ret, i, ov_id[2];
1284         int overlay_nr = 8, selftest_nr = 8;
1285
1286         /* we don't care about device state in this test */
1287
1288         /* apply the overlays */
1289         for (i = 0; i < 2; i++) {
1290
1291                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1292                 if (np == NULL) {
1293                         selftest(0, "could not find overlay node @\"%s\"\n",
1294                                         overlay_path(overlay_nr + i));
1295                         return;
1296                 }
1297
1298                 ret = of_overlay_create(np);
1299                 if (ret < 0)  {
1300                         selftest(0, "could not create overlay from \"%s\"\n",
1301                                         overlay_path(overlay_nr + i));
1302                         return;
1303                 }
1304                 ov_id[i] = ret;
1305         }
1306
1307         /* now try to remove first overlay (it should fail) */
1308         ret = of_overlay_destroy(ov_id[0]);
1309         if (ret == 0) {
1310                 selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1311                                 overlay_path(overlay_nr + 0),
1312                                 selftest_path(selftest_nr));
1313                 return;
1314         }
1315
1316         /* removing them in order should work */
1317         for (i = 1; i >= 0; i--) {
1318                 ret = of_overlay_destroy(ov_id[i]);
1319                 if (ret != 0) {
1320                         selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1321                                         overlay_path(overlay_nr + i),
1322                                         selftest_path(selftest_nr));
1323                         return;
1324                 }
1325         }
1326
1327         selftest(1, "overlay test %d passed\n", 8);
1328 }
1329
1330 static void __init of_selftest_overlay(void)
1331 {
1332         struct device_node *bus_np = NULL;
1333         int ret;
1334
1335         ret = platform_driver_register(&selftest_driver);
1336         if (ret != 0) {
1337                 selftest(0, "could not register selftest driver\n");
1338                 goto out;
1339         }
1340
1341         bus_np = of_find_node_by_path(bus_path);
1342         if (bus_np == NULL) {
1343                 selftest(0, "could not find bus_path \"%s\"\n", bus_path);
1344                 goto out;
1345         }
1346
1347         ret = of_platform_populate(bus_np, of_default_bus_match_table,
1348                         NULL, NULL);
1349         if (ret != 0) {
1350                 selftest(0, "could not populate bus @ \"%s\"\n", bus_path);
1351                 goto out;
1352         }
1353
1354         if (!of_path_platform_device_exists(selftest_path(100))) {
1355                 selftest(0, "could not find selftest0 @ \"%s\"\n",
1356                                 selftest_path(100));
1357                 goto out;
1358         }
1359
1360         if (of_path_platform_device_exists(selftest_path(101))) {
1361                 selftest(0, "selftest1 @ \"%s\" should not exist\n",
1362                                 selftest_path(101));
1363                 goto out;
1364         }
1365
1366         selftest(1, "basic infrastructure of overlays passed");
1367
1368         /* tests in sequence */
1369         of_selftest_overlay_0();
1370         of_selftest_overlay_1();
1371         of_selftest_overlay_2();
1372         of_selftest_overlay_3();
1373         of_selftest_overlay_4();
1374         of_selftest_overlay_5();
1375         of_selftest_overlay_6();
1376         of_selftest_overlay_8();
1377
1378 out:
1379         of_node_put(bus_np);
1380 }
1381
1382 #else
1383 static inline void __init of_selftest_overlay(void) { }
1384 #endif
1385
1386 static int __init of_selftest(void)
1387 {
1388         struct device_node *np;
1389         int res;
1390
1391         /* adding data for selftest */
1392         res = selftest_data_add();
1393         if (res)
1394                 return res;
1395         if (!of_aliases)
1396                 of_aliases = of_find_node_by_path("/aliases");
1397
1398         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
1399         if (!np) {
1400                 pr_info("No testcase data in device tree; not running tests\n");
1401                 return 0;
1402         }
1403         of_node_put(np);
1404
1405         pr_info("start of selftest - you will see error messages\n");
1406         of_selftest_check_tree_linkage();
1407         of_selftest_check_phandles();
1408         of_selftest_find_node_by_name();
1409         of_selftest_dynamic();
1410         of_selftest_parse_phandle_with_args();
1411         of_selftest_property_string();
1412         of_selftest_property_copy();
1413         of_selftest_changeset();
1414         of_selftest_parse_interrupts();
1415         of_selftest_parse_interrupts_extended();
1416         of_selftest_match_node();
1417         of_selftest_platform_populate();
1418         of_selftest_overlay();
1419
1420         /* Double check linkage after removing testcase data */
1421         of_selftest_check_tree_linkage();
1422
1423         pr_info("end of selftest - %i passed, %i failed\n",
1424                 selftest_results.passed, selftest_results.failed);
1425
1426         return 0;
1427 }
1428 late_initcall(of_selftest);