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 NO_OF_NODES 3
  31 static struct device_node *nodes[NO_OF_NODES];
  32 static int last_node_index;
  33 static bool selftest_live_tree;
  34
  35 #define selftest(result, fmt, ...) ({ \
  36         bool failed = !(result); \
  37         if (failed) { \
  38                 selftest_results.failed++; \
  39                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  40         } else { \
  41                 selftest_results.passed++; \
  42                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  43         } \
  44         failed; \
  45 })
  46
  47 static void __init of_selftest_find_node_by_name(void)
  48 {
  49         struct device_node *np;
  50
  51         np = of_find_node_by_path("/testcase-data");
  52         selftest(np && !strcmp("/testcase-data", np->full_name),
  53                 "find /testcase-data failed\n");
  54         of_node_put(np);
  55
  56         /* Test if trailing '/' works */
  57         np = of_find_node_by_path("/testcase-data/");
  58         selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
  59
  60         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  61         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  62                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  63         of_node_put(np);
  64
  65         np = of_find_node_by_path("testcase-alias");
  66         selftest(np && !strcmp("/testcase-data", np->full_name),
  67                 "find testcase-alias failed\n");
  68         of_node_put(np);
  69
  70         /* Test if trailing '/' works on aliases */
  71         np = of_find_node_by_path("testcase-alias/");
  72         selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
  73
  74         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  75         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  76                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  77         of_node_put(np);
  78
  79         np = of_find_node_by_path("/testcase-data/missing-path");
  80         selftest(!np, "non-existent path returned node %s\n", np->full_name);
  81         of_node_put(np);
  82
  83         np = of_find_node_by_path("missing-alias");
  84         selftest(!np, "non-existent alias returned node %s\n", np->full_name);
  85         of_node_put(np);
  86
  87         np = of_find_node_by_path("testcase-alias/missing-path");
  88         selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  89         of_node_put(np);
  90 }
  91
  92 static void __init of_selftest_dynamic(void)
  93 {
  94         struct device_node *np;
  95         struct property *prop;
  96
  97         np = of_find_node_by_path("/testcase-data");
  98         if (!np) {
  99                 pr_err("missing testcase data\n");
 100                 return;
 101         }
 102
 103         /* Array of 4 properties for the purpose of testing */
 104         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 105         if (!prop) {
 106                 selftest(0, "kzalloc() failed\n");
 107                 return;
 108         }
 109
 110         /* Add a new property - should pass*/
 111         prop->name = "new-property";
 112         prop->value = "new-property-data";
 113         prop->length = strlen(prop->value);
 114         selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 115
 116         /* Try to add an existing property - should fail */
 117         prop++;
 118         prop->name = "new-property";
 119         prop->value = "new-property-data-should-fail";
 120         prop->length = strlen(prop->value);
 121         selftest(of_add_property(np, prop) != 0,
 122                  "Adding an existing property should have failed\n");
 123
 124         /* Try to modify an existing property - should pass */
 125         prop->value = "modify-property-data-should-pass";
 126         prop->length = strlen(prop->value);
 127         selftest(of_update_property(np, prop) == 0,
 128                  "Updating an existing property should have passed\n");
 129
 130         /* Try to modify non-existent property - should pass*/
 131         prop++;
 132         prop->name = "modify-property";
 133         prop->value = "modify-missing-property-data-should-pass";
 134         prop->length = strlen(prop->value);
 135         selftest(of_update_property(np, prop) == 0,
 136                  "Updating a missing property should have passed\n");
 137
 138         /* Remove property - should pass */
 139         selftest(of_remove_property(np, prop) == 0,
 140                  "Removing a property should have passed\n");
 141
 142         /* Adding very large property - should pass */
 143         prop++;
 144         prop->name = "large-property-PAGE_SIZEx8";
 145         prop->length = PAGE_SIZE * 8;
 146         prop->value = kzalloc(prop->length, GFP_KERNEL);
 147         selftest(prop->value != NULL, "Unable to allocate large buffer\n");
 148         if (prop->value)
 149                 selftest(of_add_property(np, prop) == 0,
 150                          "Adding a large property should have passed\n");
 151 }
 152
 153 static int __init of_selftest_check_node_linkage(struct device_node *np)
 154 {
 155         struct device_node *child;
 156         int count = 0, rc;
 157
 158         for_each_child_of_node(np, child) {
 159                 if (child->parent != np) {
 160                         pr_err("Child node %s links to wrong parent %s\n",
 161                                  child->name, np->name);
 162                         return -EINVAL;
 163                 }
 164
 165                 rc = of_selftest_check_node_linkage(child);
 166                 if (rc < 0)
 167                         return rc;
 168                 count += rc;
 169         }
 170
 171         return count + 1;
 172 }
 173
 174 static void __init of_selftest_check_tree_linkage(void)
 175 {
 176         struct device_node *np;
 177         int allnode_count = 0, child_count;
 178
 179         if (!of_root)
 180                 return;
 181
 182         for_each_of_allnodes(np)
 183                 allnode_count++;
 184         child_count = of_selftest_check_node_linkage(of_root);
 185
 186         selftest(child_count > 0, "Device node data structure is corrupted\n");
 187         selftest(child_count == allnode_count, "allnodes list size (%i) doesn't match"
 188                  "sibling lists size (%i)\n", allnode_count, child_count);
 189         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 190 }
 191
 192 struct node_hash {
 193         struct hlist_node node;
 194         struct device_node *np;
 195 };
 196
 197 static DEFINE_HASHTABLE(phandle_ht, 8);
 198 static void __init of_selftest_check_phandles(void)
 199 {
 200         struct device_node *np;
 201         struct node_hash *nh;
 202         struct hlist_node *tmp;
 203         int i, dup_count = 0, phandle_count = 0;
 204
 205         for_each_of_allnodes(np) {
 206                 if (!np->phandle)
 207                         continue;
 208
 209                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 210                         if (nh->np->phandle == np->phandle) {
 211                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 212                                         np->phandle, nh->np->full_name, np->full_name);
 213                                 dup_count++;
 214                                 break;
 215                         }
 216                 }
 217
 218                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 219                 if (WARN_ON(!nh))
 220                         return;
 221
 222                 nh->np = np;
 223                 hash_add(phandle_ht, &nh->node, np->phandle);
 224                 phandle_count++;
 225         }
 226         selftest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 227                  dup_count, phandle_count);
 228
 229         /* Clean up */
 230         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 231                 hash_del(&nh->node);
 232                 kfree(nh);
 233         }
 234 }
 235
 236 static void __init of_selftest_parse_phandle_with_args(void)
 237 {
 238         struct device_node *np;
 239         struct of_phandle_args args;
 240         int i, rc;
 241
 242         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 243         if (!np) {
 244                 pr_err("missing testcase data\n");
 245                 return;
 246         }
 247
 248         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 249         selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 250
 251         for (i = 0; i < 8; i++) {
 252                 bool passed = true;
 253                 rc = of_parse_phandle_with_args(np, "phandle-list",
 254                                                 "#phandle-cells", i, &args);
 255
 256                 /* Test the values from tests-phandle.dtsi */
 257                 switch (i) {
 258                 case 0:
 259                         passed &= !rc;
 260                         passed &= (args.args_count == 1);
 261                         passed &= (args.args[0] == (i + 1));
 262                         break;
 263                 case 1:
 264                         passed &= !rc;
 265                         passed &= (args.args_count == 2);
 266                         passed &= (args.args[0] == (i + 1));
 267                         passed &= (args.args[1] == 0);
 268                         break;
 269                 case 2:
 270                         passed &= (rc == -ENOENT);
 271                         break;
 272                 case 3:
 273                         passed &= !rc;
 274                         passed &= (args.args_count == 3);
 275                         passed &= (args.args[0] == (i + 1));
 276                         passed &= (args.args[1] == 4);
 277                         passed &= (args.args[2] == 3);
 278                         break;
 279                 case 4:
 280                         passed &= !rc;
 281                         passed &= (args.args_count == 2);
 282                         passed &= (args.args[0] == (i + 1));
 283                         passed &= (args.args[1] == 100);
 284                         break;
 285                 case 5:
 286                         passed &= !rc;
 287                         passed &= (args.args_count == 0);
 288                         break;
 289                 case 6:
 290                         passed &= !rc;
 291                         passed &= (args.args_count == 1);
 292                         passed &= (args.args[0] == (i + 1));
 293                         break;
 294                 case 7:
 295                         passed &= (rc == -ENOENT);
 296                         break;
 297                 default:
 298                         passed = false;
 299                 }
 300
 301                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 302                          i, args.np->full_name, rc);
 303         }
 304
 305         /* Check for missing list property */
 306         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 307                                         "#phandle-cells", 0, &args);
 308         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 309         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 310                                         "#phandle-cells");
 311         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 312
 313         /* Check for missing cells property */
 314         rc = of_parse_phandle_with_args(np, "phandle-list",
 315                                         "#phandle-cells-missing", 0, &args);
 316         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 317         rc = of_count_phandle_with_args(np, "phandle-list",
 318                                         "#phandle-cells-missing");
 319         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 320
 321         /* Check for bad phandle in list */
 322         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 323                                         "#phandle-cells", 0, &args);
 324         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 325         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 326                                         "#phandle-cells");
 327         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 328
 329         /* Check for incorrectly formed argument list */
 330         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 331                                         "#phandle-cells", 1, &args);
 332         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 333         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 334                                         "#phandle-cells");
 335         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 336 }
 337
 338 static void __init of_selftest_property_string(void)
 339 {
 340         const char *strings[4];
 341         struct device_node *np;
 342         int rc;
 343
 344         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 345         if (!np) {
 346                 pr_err("No testcase data in device tree\n");
 347                 return;
 348         }
 349
 350         rc = of_property_match_string(np, "phandle-list-names", "first");
 351         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 352         rc = of_property_match_string(np, "phandle-list-names", "second");
 353         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 354         rc = of_property_match_string(np, "phandle-list-names", "third");
 355         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 356         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 357         selftest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 358         rc = of_property_match_string(np, "missing-property", "blah");
 359         selftest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 360         rc = of_property_match_string(np, "empty-property", "blah");
 361         selftest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 362         rc = of_property_match_string(np, "unterminated-string", "blah");
 363         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 364
 365         /* of_property_count_strings() tests */
 366         rc = of_property_count_strings(np, "string-property");
 367         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 368         rc = of_property_count_strings(np, "phandle-list-names");
 369         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 370         rc = of_property_count_strings(np, "unterminated-string");
 371         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 372         rc = of_property_count_strings(np, "unterminated-string-list");
 373         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 374
 375         /* of_property_read_string_index() tests */
 376         rc = of_property_read_string_index(np, "string-property", 0, strings);
 377         selftest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 378         strings[0] = NULL;
 379         rc = of_property_read_string_index(np, "string-property", 1, strings);
 380         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 381         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 382         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 383         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 384         selftest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 385         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 386         selftest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 387         strings[0] = NULL;
 388         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 389         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 390         strings[0] = NULL;
 391         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 392         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 393         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 394         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 395         strings[0] = NULL;
 396         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 397         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 398         strings[1] = NULL;
 399
 400         /* of_property_read_string_array() tests */
 401         rc = of_property_read_string_array(np, "string-property", strings, 4);
 402         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 403         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 404         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 405         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 406         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 407         /* -- An incorrectly formed string should cause a failure */
 408         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 409         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 410         /* -- parsing the correctly formed strings should still work: */
 411         strings[2] = NULL;
 412         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 413         selftest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 414         strings[1] = NULL;
 415         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 416         selftest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 417 }
 418
 419 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 420                         (p1)->value && (p2)->value && \
 421                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 422                         !strcmp((p1)->name, (p2)->name))
 423 static void __init of_selftest_property_copy(void)
 424 {
 425 #ifdef CONFIG_OF_DYNAMIC
 426         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 427         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 428         struct property *new;
 429
 430         new = __of_prop_dup(&p1, GFP_KERNEL);
 431         selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 432         kfree(new->value);
 433         kfree(new->name);
 434         kfree(new);
 435
 436         new = __of_prop_dup(&p2, GFP_KERNEL);
 437         selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 438         kfree(new->value);
 439         kfree(new->name);
 440         kfree(new);
 441 #endif
 442 }
 443
 444 static void __init of_selftest_changeset(void)
 445 {
 446 #ifdef CONFIG_OF_DYNAMIC
 447         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 448         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 449         struct property *ppremove;
 450         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 451         struct of_changeset chgset;
 452
 453         of_changeset_init(&chgset);
 454         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 455         selftest(n1, "testcase setup failure\n");
 456         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 457         selftest(n2, "testcase setup failure\n");
 458         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 459         selftest(n21, "testcase setup failure %p\n", n21);
 460         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 461         selftest(nremove, "testcase setup failure\n");
 462         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 463         selftest(ppadd, "testcase setup failure\n");
 464         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 465         selftest(ppupdate, "testcase setup failure\n");
 466         parent = nremove->parent;
 467         n1->parent = parent;
 468         n2->parent = parent;
 469         n21->parent = n2;
 470         n2->child = n21;
 471         ppremove = of_find_property(parent, "prop-remove", NULL);
 472         selftest(ppremove, "failed to find removal prop");
 473
 474         of_changeset_init(&chgset);
 475         selftest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 476         selftest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 477         selftest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 478         selftest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 479         selftest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 480         selftest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 481         selftest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 482         mutex_lock(&of_mutex);
 483         selftest(!of_changeset_apply(&chgset), "apply failed\n");
 484         mutex_unlock(&of_mutex);
 485
 486         /* Make sure node names are constructed correctly */
 487         selftest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 488                  "'%s' not added\n", n21->full_name);
 489         if (np)
 490                 of_node_put(np);
 491
 492         mutex_lock(&of_mutex);
 493         selftest(!of_changeset_revert(&chgset), "revert failed\n");
 494         mutex_unlock(&of_mutex);
 495
 496         of_changeset_destroy(&chgset);
 497 #endif
 498 }
 499
 500 static void __init of_selftest_parse_interrupts(void)
 501 {
 502         struct device_node *np;
 503         struct of_phandle_args args;
 504         int i, rc;
 505
 506         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 507         if (!np) {
 508                 pr_err("missing testcase data\n");
 509                 return;
 510         }
 511
 512         for (i = 0; i < 4; i++) {
 513                 bool passed = true;
 514                 args.args_count = 0;
 515                 rc = of_irq_parse_one(np, i, &args);
 516
 517                 passed &= !rc;
 518                 passed &= (args.args_count == 1);
 519                 passed &= (args.args[0] == (i + 1));
 520
 521                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 522                          i, args.np->full_name, rc);
 523         }
 524         of_node_put(np);
 525
 526         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 527         if (!np) {
 528                 pr_err("missing testcase data\n");
 529                 return;
 530         }
 531
 532         for (i = 0; i < 4; i++) {
 533                 bool passed = true;
 534                 args.args_count = 0;
 535                 rc = of_irq_parse_one(np, i, &args);
 536
 537                 /* Test the values from tests-phandle.dtsi */
 538                 switch (i) {
 539                 case 0:
 540                         passed &= !rc;
 541                         passed &= (args.args_count == 1);
 542                         passed &= (args.args[0] == 9);
 543                         break;
 544                 case 1:
 545                         passed &= !rc;
 546                         passed &= (args.args_count == 3);
 547                         passed &= (args.args[0] == 10);
 548                         passed &= (args.args[1] == 11);
 549                         passed &= (args.args[2] == 12);
 550                         break;
 551                 case 2:
 552                         passed &= !rc;
 553                         passed &= (args.args_count == 2);
 554                         passed &= (args.args[0] == 13);
 555                         passed &= (args.args[1] == 14);
 556                         break;
 557                 case 3:
 558                         passed &= !rc;
 559                         passed &= (args.args_count == 2);
 560                         passed &= (args.args[0] == 15);
 561                         passed &= (args.args[1] == 16);
 562                         break;
 563                 default:
 564                         passed = false;
 565                 }
 566                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 567                          i, args.np->full_name, rc);
 568         }
 569         of_node_put(np);
 570 }
 571
 572 static void __init of_selftest_parse_interrupts_extended(void)
 573 {
 574         struct device_node *np;
 575         struct of_phandle_args args;
 576         int i, rc;
 577
 578         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 579         if (!np) {
 580                 pr_err("missing testcase data\n");
 581                 return;
 582         }
 583
 584         for (i = 0; i < 7; i++) {
 585                 bool passed = true;
 586                 rc = of_irq_parse_one(np, i, &args);
 587
 588                 /* Test the values from tests-phandle.dtsi */
 589                 switch (i) {
 590                 case 0:
 591                         passed &= !rc;
 592                         passed &= (args.args_count == 1);
 593                         passed &= (args.args[0] == 1);
 594                         break;
 595                 case 1:
 596                         passed &= !rc;
 597                         passed &= (args.args_count == 3);
 598                         passed &= (args.args[0] == 2);
 599                         passed &= (args.args[1] == 3);
 600                         passed &= (args.args[2] == 4);
 601                         break;
 602                 case 2:
 603                         passed &= !rc;
 604                         passed &= (args.args_count == 2);
 605                         passed &= (args.args[0] == 5);
 606                         passed &= (args.args[1] == 6);
 607                         break;
 608                 case 3:
 609                         passed &= !rc;
 610                         passed &= (args.args_count == 1);
 611                         passed &= (args.args[0] == 9);
 612                         break;
 613                 case 4:
 614                         passed &= !rc;
 615                         passed &= (args.args_count == 3);
 616                         passed &= (args.args[0] == 10);
 617                         passed &= (args.args[1] == 11);
 618                         passed &= (args.args[2] == 12);
 619                         break;
 620                 case 5:
 621                         passed &= !rc;
 622                         passed &= (args.args_count == 2);
 623                         passed &= (args.args[0] == 13);
 624                         passed &= (args.args[1] == 14);
 625                         break;
 626                 case 6:
 627                         passed &= !rc;
 628                         passed &= (args.args_count == 1);
 629                         passed &= (args.args[0] == 15);
 630                         break;
 631                 default:
 632                         passed = false;
 633                 }
 634
 635                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 636                          i, args.np->full_name, rc);
 637         }
 638         of_node_put(np);
 639 }
 640
 641 static struct of_device_id match_node_table[] = {
 642         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 643         { .data = "B", .type = "type1", }, /* followed by type alone */
 644
 645         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 646         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 647         { .data = "Cc", .name = "name2", .type = "type2", },
 648
 649         { .data = "E", .compatible = "compat3" },
 650         { .data = "G", .compatible = "compat2", },
 651         { .data = "H", .compatible = "compat2", .name = "name5", },
 652         { .data = "I", .compatible = "compat2", .type = "type1", },
 653         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 654         { .data = "K", .compatible = "compat2", .name = "name9", },
 655         {}
 656 };
 657
 658 static struct {
 659         const char *path;
 660         const char *data;
 661 } match_node_tests[] = {
 662         { .path = "/testcase-data/match-node/name0", .data = "A", },
 663         { .path = "/testcase-data/match-node/name1", .data = "B", },
 664         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 665         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 666         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 667         { .path = "/testcase-data/match-node/name3", .data = "E", },
 668         { .path = "/testcase-data/match-node/name4", .data = "G", },
 669         { .path = "/testcase-data/match-node/name5", .data = "H", },
 670         { .path = "/testcase-data/match-node/name6", .data = "G", },
 671         { .path = "/testcase-data/match-node/name7", .data = "I", },
 672         { .path = "/testcase-data/match-node/name8", .data = "J", },
 673         { .path = "/testcase-data/match-node/name9", .data = "K", },
 674 };
 675
 676 static void __init of_selftest_match_node(void)
 677 {
 678         struct device_node *np;
 679         const struct of_device_id *match;
 680         int i;
 681
 682         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 683                 np = of_find_node_by_path(match_node_tests[i].path);
 684                 if (!np) {
 685                         selftest(0, "missing testcase node %s\n",
 686                                 match_node_tests[i].path);
 687                         continue;
 688                 }
 689
 690                 match = of_match_node(match_node_table, np);
 691                 if (!match) {
 692                         selftest(0, "%s didn't match anything\n",
 693                                 match_node_tests[i].path);
 694                         continue;
 695                 }
 696
 697                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 698                         selftest(0, "%s got wrong match. expected %s, got %s\n",
 699                                 match_node_tests[i].path, match_node_tests[i].data,
 700                                 (const char *)match->data);
 701                         continue;
 702                 }
 703                 selftest(1, "passed");
 704         }
 705 }
 706
 707 struct device test_bus = {
 708         .init_name = "unittest-bus",
 709 };
 710 static void __init of_selftest_platform_populate(void)
 711 {
 712         int irq, rc;
 713         struct device_node *np, *child, *grandchild;
 714         struct platform_device *pdev;
 715         struct of_device_id match[] = {
 716                 { .compatible = "test-device", },
 717                 {}
 718         };
 719
 720         np = of_find_node_by_path("/testcase-data");
 721         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 722
 723         /* Test that a missing irq domain returns -EPROBE_DEFER */
 724         np = of_find_node_by_path("/testcase-data/testcase-device1");
 725         pdev = of_find_device_by_node(np);
 726         selftest(pdev, "device 1 creation failed\n");
 727
 728         irq = platform_get_irq(pdev, 0);
 729         selftest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 730
 731         /* Test that a parsing failure does not return -EPROBE_DEFER */
 732         np = of_find_node_by_path("/testcase-data/testcase-device2");
 733         pdev = of_find_device_by_node(np);
 734         selftest(pdev, "device 2 creation failed\n");
 735         irq = platform_get_irq(pdev, 0);
 736         selftest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 737
 738         if (selftest(np = of_find_node_by_path("/testcase-data/platform-tests"),
 739                      "No testcase data in device tree\n"));
 740                 return;
 741
 742         if (selftest(!(rc = device_register(&test_bus)),
 743                      "testbus registration failed; rc=%i\n", rc));
 744                 return;
 745
 746         for_each_child_of_node(np, child) {
 747                 of_platform_populate(child, match, NULL, &test_bus);
 748                 for_each_child_of_node(child, grandchild)
 749                         selftest(of_find_device_by_node(grandchild),
 750                                  "Could not create device for node '%s'\n",
 751                                  grandchild->name);
 752         }
 753
 754         of_platform_depopulate(&test_bus);
 755         for_each_child_of_node(np, child) {
 756                 for_each_child_of_node(child, grandchild)
 757                         selftest(!of_find_device_by_node(grandchild),
 758                                  "device didn't get destroyed '%s'\n",
 759                                  grandchild->name);
 760         }
 761
 762         device_unregister(&test_bus);
 763         of_node_put(np);
 764 }
 765
 766 /**
 767  *      update_node_properties - adds the properties
 768  *      of np into dup node (present in live tree) and
 769  *      updates parent of children of np to dup.
 770  *
 771  *      @np:    node already present in live tree
 772  *      @dup:   node present in live tree to be updated
 773  */
 774 static void update_node_properties(struct device_node *np,
 775                                         struct device_node *dup)
 776 {
 777         struct property *prop;
 778         struct device_node *child;
 779
 780         for_each_property_of_node(np, prop)
 781                 of_add_property(dup, prop);
 782
 783         for_each_child_of_node(np, child)
 784                 child->parent = dup;
 785 }
 786
 787 /**
 788  *      attach_node_and_children - attaches nodes
 789  *      and its children to live tree
 790  *
 791  *      @np:    Node to attach to live tree
 792  */
 793 static int attach_node_and_children(struct device_node *np)
 794 {
 795         struct device_node *next, *dup, *child;
 796
 797         dup = of_find_node_by_path(np->full_name);
 798         if (dup) {
 799                 update_node_properties(np, dup);
 800                 return 0;
 801         }
 802
 803         /* Children of the root need to be remembered for removal */
 804         if (np->parent == of_root) {
 805                 if (WARN_ON(last_node_index >= NO_OF_NODES))
 806                         return -EINVAL;
 807                 nodes[last_node_index++] = np;
 808         }
 809
 810         child = np->child;
 811         np->child = NULL;
 812         np->sibling = NULL;
 813         of_attach_node(np);
 814         while (child) {
 815                 next = child->sibling;
 816                 attach_node_and_children(child);
 817                 child = next;
 818         }
 819
 820         return 0;
 821 }
 822
 823 /**
 824  *      selftest_data_add - Reads, copies data from
 825  *      linked tree and attaches it to the live tree
 826  */
 827 static int __init selftest_data_add(void)
 828 {
 829         void *selftest_data;
 830         struct device_node *selftest_data_node, *np;
 831         extern uint8_t __dtb_testcases_begin[];
 832         extern uint8_t __dtb_testcases_end[];
 833         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 834         int rc;
 835
 836         if (!size) {
 837                 pr_warn("%s: No testcase data to attach; not running tests\n",
 838                         __func__);
 839                 return -ENODATA;
 840         }
 841
 842         /* creating copy */
 843         selftest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 844
 845         if (!selftest_data) {
 846                 pr_warn("%s: Failed to allocate memory for selftest_data; "
 847                         "not running tests\n", __func__);
 848                 return -ENOMEM;
 849         }
 850         of_fdt_unflatten_tree(selftest_data, &selftest_data_node);
 851         if (!selftest_data_node) {
 852                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 853                 return -ENODATA;
 854         }
 855         of_node_set_flag(selftest_data_node, OF_DETACHED);
 856         rc = of_resolve_phandles(selftest_data_node);
 857         if (rc) {
 858                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 859                 return -EINVAL;
 860         }
 861
 862         if (!of_root) {
 863                 /* enabling flag for removing nodes */
 864                 selftest_live_tree = true;
 865                 of_root = selftest_data_node;
 866
 867                 for_each_of_allnodes(np)
 868                         __of_attach_node_sysfs(np);
 869                 of_aliases = of_find_node_by_path("/aliases");
 870                 of_chosen = of_find_node_by_path("/chosen");
 871                 return 0;
 872         }
 873
 874         /* attach the sub-tree to live tree */
 875         np = selftest_data_node->child;
 876         while (np) {
 877                 struct device_node *next = np->sibling;
 878                 np->parent = of_root;
 879                 attach_node_and_children(np);
 880                 np = next;
 881         }
 882         return 0;
 883 }
 884
 885 /**
 886  *      detach_node_and_children - detaches node
 887  *      and its children from live tree
 888  *
 889  *      @np:    Node to detach from live tree
 890  */
 891 static void detach_node_and_children(struct device_node *np)
 892 {
 893         while (np->child)
 894                 detach_node_and_children(np->child);
 895         of_detach_node(np);
 896 }
 897
 898 /**
 899  *      selftest_data_remove - removes the selftest data
 900  *      nodes from the live tree
 901  */
 902 static void selftest_data_remove(void)
 903 {
 904         struct device_node *np;
 905         struct property *prop;
 906
 907         if (selftest_live_tree) {
 908                 of_node_put(of_aliases);
 909                 of_node_put(of_chosen);
 910                 of_aliases = NULL;
 911                 of_chosen = NULL;
 912                 for_each_child_of_node(of_root, np)
 913                         detach_node_and_children(np);
 914                 __of_detach_node_sysfs(of_root);
 915                 of_root = NULL;
 916                 return;
 917         }
 918
 919         while (last_node_index-- > 0) {
 920                 if (nodes[last_node_index]) {
 921                         np = of_find_node_by_path(nodes[last_node_index]->full_name);
 922                         if (np == nodes[last_node_index]) {
 923                                 if (of_aliases == np) {
 924                                         of_node_put(of_aliases);
 925                                         of_aliases = NULL;
 926                                 }
 927                                 detach_node_and_children(np);
 928                         } else {
 929                                 for_each_property_of_node(np, prop) {
 930                                         if (strcmp(prop->name, "testcase-alias") == 0)
 931                                                 of_remove_property(np, prop);
 932                                 }
 933                         }
 934                 }
 935         }
 936 }
 937
 938 #ifdef CONFIG_OF_OVERLAY
 939
 940 static int selftest_probe(struct platform_device *pdev)
 941 {
 942         struct device *dev = &pdev->dev;
 943         struct device_node *np = dev->of_node;
 944
 945         if (np == NULL) {
 946                 dev_err(dev, "No OF data for device\n");
 947                 return -EINVAL;
 948
 949         }
 950
 951         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 952         return 0;
 953 }
 954
 955 static int selftest_remove(struct platform_device *pdev)
 956 {
 957         struct device *dev = &pdev->dev;
 958         struct device_node *np = dev->of_node;
 959
 960         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 961         return 0;
 962 }
 963
 964 static struct of_device_id selftest_match[] = {
 965         { .compatible = "selftest", },
 966         {},
 967 };
 968
 969 static struct platform_driver selftest_driver = {
 970         .probe                  = selftest_probe,
 971         .remove                 = selftest_remove,
 972         .driver = {
 973                 .name           = "selftest",
 974                 .owner          = THIS_MODULE,
 975                 .of_match_table = of_match_ptr(selftest_match),
 976         },
 977 };
 978
 979 /* get the platform device instantiated at the path */
 980 static struct platform_device *of_path_to_platform_device(const char *path)
 981 {
 982         struct device_node *np;
 983         struct platform_device *pdev;
 984
 985         np = of_find_node_by_path(path);
 986         if (np == NULL)
 987                 return NULL;
 988
 989         pdev = of_find_device_by_node(np);
 990         of_node_put(np);
 991
 992         return pdev;
 993 }
 994
 995 /* find out if a platform device exists at that path */
 996 static int of_path_platform_device_exists(const char *path)
 997 {
 998         struct platform_device *pdev;
 999
1000         pdev = of_path_to_platform_device(path);
1001         platform_device_put(pdev);
1002         return pdev != NULL;
1003 }
1004
1005 static const char *selftest_path(int nr)
1006 {
1007         static char buf[256];
1008
1009         snprintf(buf, sizeof(buf) - 1,
1010                 "/testcase-data/overlay-node/test-bus/test-selftest%d", nr);
1011         buf[sizeof(buf) - 1] = '\0';
1012
1013         return buf;
1014 }
1015
1016 static const char *overlay_path(int nr)
1017 {
1018         static char buf[256];
1019
1020         snprintf(buf, sizeof(buf) - 1,
1021                 "/testcase-data/overlay%d", nr);
1022         buf[sizeof(buf) - 1] = '\0';
1023
1024         return buf;
1025 }
1026
1027 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1028
1029 static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
1030                 int *overlay_id)
1031 {
1032         struct device_node *np = NULL;
1033         int ret, id = -1;
1034
1035         np = of_find_node_by_path(overlay_path(overlay_nr));
1036         if (np == NULL) {
1037                 selftest(0, "could not find overlay node @\"%s\"\n",
1038                                 overlay_path(overlay_nr));
1039                 ret = -EINVAL;
1040                 goto out;
1041         }
1042
1043         ret = of_overlay_create(np);
1044         if (ret < 0) {
1045                 selftest(0, "could not create overlay from \"%s\"\n",
1046                                 overlay_path(overlay_nr));
1047                 goto out;
1048         }
1049         id = ret;
1050
1051         ret = 0;
1052
1053 out:
1054         of_node_put(np);
1055
1056         if (overlay_id)
1057                 *overlay_id = id;
1058
1059         return ret;
1060 }
1061
1062 /* apply an overlay while checking before and after states */
1063 static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
1064                 int before, int after)
1065 {
1066         int ret;
1067
1068         /* selftest device must not be in before state */
1069         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1070                         != before) {
1071                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1072                                 overlay_path(overlay_nr),
1073                                 selftest_path(selftest_nr),
1074                                 !before ? "enabled" : "disabled");
1075                 return -EINVAL;
1076         }
1077
1078         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, NULL);
1079         if (ret != 0) {
1080                 /* of_selftest_apply_overlay already called selftest() */
1081                 return ret;
1082         }
1083
1084         /* selftest device must be to set to after state */
1085         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1086                         != after) {
1087                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1088                                 overlay_path(overlay_nr),
1089                                 selftest_path(selftest_nr),
1090                                 !after ? "enabled" : "disabled");
1091                 return -EINVAL;
1092         }
1093
1094         return 0;
1095 }
1096
1097 /* apply an overlay and then revert it while checking before, after states */
1098 static int of_selftest_apply_revert_overlay_check(int overlay_nr,
1099                 int selftest_nr, int before, int after)
1100 {
1101         int ret, ov_id;
1102
1103         /* selftest device must be in before state */
1104         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1105                         != before) {
1106                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1107                                 overlay_path(overlay_nr),
1108                                 selftest_path(selftest_nr),
1109                                 !before ? "enabled" : "disabled");
1110                 return -EINVAL;
1111         }
1112
1113         /* apply the overlay */
1114         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, &ov_id);
1115         if (ret != 0) {
1116                 /* of_selftest_apply_overlay already called selftest() */
1117                 return ret;
1118         }
1119
1120         /* selftest device must be in after state */
1121         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1122                         != after) {
1123                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1124                                 overlay_path(overlay_nr),
1125                                 selftest_path(selftest_nr),
1126                                 !after ? "enabled" : "disabled");
1127                 return -EINVAL;
1128         }
1129
1130         ret = of_overlay_destroy(ov_id);
1131         if (ret != 0) {
1132                 selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1133                                 overlay_path(overlay_nr),
1134                                 selftest_path(selftest_nr));
1135                 return ret;
1136         }
1137
1138         /* selftest device must be again in before state */
1139         if (of_path_platform_device_exists(selftest_path(selftest_nr))
1140                         != before) {
1141                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1142                                 overlay_path(overlay_nr),
1143                                 selftest_path(selftest_nr),
1144                                 !before ? "enabled" : "disabled");
1145                 return -EINVAL;
1146         }
1147
1148         return 0;
1149 }
1150
1151 /* test activation of device */
1152 static void of_selftest_overlay_0(void)
1153 {
1154         int ret;
1155
1156         /* device should enable */
1157         ret = of_selftest_apply_overlay_check(0, 0, 0, 1);
1158         if (ret != 0)
1159                 return;
1160
1161         selftest(1, "overlay test %d passed\n", 0);
1162 }
1163
1164 /* test deactivation of device */
1165 static void of_selftest_overlay_1(void)
1166 {
1167         int ret;
1168
1169         /* device should disable */
1170         ret = of_selftest_apply_overlay_check(1, 1, 1, 0);
1171         if (ret != 0)
1172                 return;
1173
1174         selftest(1, "overlay test %d passed\n", 1);
1175 }
1176
1177 /* test activation of device */
1178 static void of_selftest_overlay_2(void)
1179 {
1180         int ret;
1181
1182         /* device should enable */
1183         ret = of_selftest_apply_overlay_check(2, 2, 0, 1);
1184         if (ret != 0)
1185                 return;
1186
1187         selftest(1, "overlay test %d passed\n", 2);
1188 }
1189
1190 /* test deactivation of device */
1191 static void of_selftest_overlay_3(void)
1192 {
1193         int ret;
1194
1195         /* device should disable */
1196         ret = of_selftest_apply_overlay_check(3, 3, 1, 0);
1197         if (ret != 0)
1198                 return;
1199
1200         selftest(1, "overlay test %d passed\n", 3);
1201 }
1202
1203 /* test activation of a full device node */
1204 static void of_selftest_overlay_4(void)
1205 {
1206         int ret;
1207
1208         /* device should disable */
1209         ret = of_selftest_apply_overlay_check(4, 4, 0, 1);
1210         if (ret != 0)
1211                 return;
1212
1213         selftest(1, "overlay test %d passed\n", 4);
1214 }
1215
1216 /* test overlay apply/revert sequence */
1217 static void of_selftest_overlay_5(void)
1218 {
1219         int ret;
1220
1221         /* device should disable */
1222         ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1);
1223         if (ret != 0)
1224                 return;
1225
1226         selftest(1, "overlay test %d passed\n", 5);
1227 }
1228
1229 /* test overlay application in sequence */
1230 static void of_selftest_overlay_6(void)
1231 {
1232         struct device_node *np;
1233         int ret, i, ov_id[2];
1234         int overlay_nr = 6, selftest_nr = 6;
1235         int before = 0, after = 1;
1236
1237         /* selftest device must be in before state */
1238         for (i = 0; i < 2; i++) {
1239                 if (of_path_platform_device_exists(
1240                                         selftest_path(selftest_nr + i))
1241                                 != before) {
1242                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1243                                         overlay_path(overlay_nr + i),
1244                                         selftest_path(selftest_nr + i),
1245                                         !before ? "enabled" : "disabled");
1246                         return;
1247                 }
1248         }
1249
1250         /* apply the overlays */
1251         for (i = 0; i < 2; i++) {
1252
1253                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1254                 if (np == NULL) {
1255                         selftest(0, "could not find overlay node @\"%s\"\n",
1256                                         overlay_path(overlay_nr + i));
1257                         return;
1258                 }
1259
1260                 ret = of_overlay_create(np);
1261                 if (ret < 0)  {
1262                         selftest(0, "could not create overlay from \"%s\"\n",
1263                                         overlay_path(overlay_nr + i));
1264                         return;
1265                 }
1266                 ov_id[i] = ret;
1267         }
1268
1269         for (i = 0; i < 2; i++) {
1270                 /* selftest device must be in after state */
1271                 if (of_path_platform_device_exists(
1272                                         selftest_path(selftest_nr + i))
1273                                 != after) {
1274                         selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1275                                         overlay_path(overlay_nr + i),
1276                                         selftest_path(selftest_nr + i),
1277                                         !after ? "enabled" : "disabled");
1278                         return;
1279                 }
1280         }
1281
1282         for (i = 1; i >= 0; i--) {
1283                 ret = of_overlay_destroy(ov_id[i]);
1284                 if (ret != 0) {
1285                         selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1286                                         overlay_path(overlay_nr + i),
1287                                         selftest_path(selftest_nr + i));
1288                         return;
1289                 }
1290         }
1291
1292         for (i = 0; i < 2; i++) {
1293                 /* selftest device must be again in before state */
1294                 if (of_path_platform_device_exists(
1295                                         selftest_path(selftest_nr + i))
1296                                 != before) {
1297                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1298                                         overlay_path(overlay_nr + i),
1299                                         selftest_path(selftest_nr + i),
1300                                         !before ? "enabled" : "disabled");
1301                         return;
1302                 }
1303         }
1304
1305         selftest(1, "overlay test %d passed\n", 6);
1306 }
1307
1308 /* test overlay application in sequence */
1309 static void of_selftest_overlay_8(void)
1310 {
1311         struct device_node *np;
1312         int ret, i, ov_id[2];
1313         int overlay_nr = 8, selftest_nr = 8;
1314
1315         /* we don't care about device state in this test */
1316
1317         /* apply the overlays */
1318         for (i = 0; i < 2; i++) {
1319
1320                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1321                 if (np == NULL) {
1322                         selftest(0, "could not find overlay node @\"%s\"\n",
1323                                         overlay_path(overlay_nr + i));
1324                         return;
1325                 }
1326
1327                 ret = of_overlay_create(np);
1328                 if (ret < 0)  {
1329                         selftest(0, "could not create overlay from \"%s\"\n",
1330                                         overlay_path(overlay_nr + i));
1331                         return;
1332                 }
1333                 ov_id[i] = ret;
1334         }
1335
1336         /* now try to remove first overlay (it should fail) */
1337         ret = of_overlay_destroy(ov_id[0]);
1338         if (ret == 0) {
1339                 selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1340                                 overlay_path(overlay_nr + 0),
1341                                 selftest_path(selftest_nr));
1342                 return;
1343         }
1344
1345         /* removing them in order should work */
1346         for (i = 1; i >= 0; i--) {
1347                 ret = of_overlay_destroy(ov_id[i]);
1348                 if (ret != 0) {
1349                         selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1350                                         overlay_path(overlay_nr + i),
1351                                         selftest_path(selftest_nr));
1352                         return;
1353                 }
1354         }
1355
1356         selftest(1, "overlay test %d passed\n", 8);
1357 }
1358
1359 static void __init of_selftest_overlay(void)
1360 {
1361         struct device_node *bus_np = NULL;
1362         int ret;
1363
1364         ret = platform_driver_register(&selftest_driver);
1365         if (ret != 0) {
1366                 selftest(0, "could not register selftest driver\n");
1367                 goto out;
1368         }
1369
1370         bus_np = of_find_node_by_path(bus_path);
1371         if (bus_np == NULL) {
1372                 selftest(0, "could not find bus_path \"%s\"\n", bus_path);
1373                 goto out;
1374         }
1375
1376         ret = of_platform_populate(bus_np, of_default_bus_match_table,
1377                         NULL, NULL);
1378         if (ret != 0) {
1379                 selftest(0, "could not populate bus @ \"%s\"\n", bus_path);
1380                 goto out;
1381         }
1382
1383         if (!of_path_platform_device_exists(selftest_path(100))) {
1384                 selftest(0, "could not find selftest0 @ \"%s\"\n",
1385                                 selftest_path(100));
1386                 goto out;
1387         }
1388
1389         if (of_path_platform_device_exists(selftest_path(101))) {
1390                 selftest(0, "selftest1 @ \"%s\" should not exist\n",
1391                                 selftest_path(101));
1392                 goto out;
1393         }
1394
1395         selftest(1, "basic infrastructure of overlays passed");
1396
1397         /* tests in sequence */
1398         of_selftest_overlay_0();
1399         of_selftest_overlay_1();
1400         of_selftest_overlay_2();
1401         of_selftest_overlay_3();
1402         of_selftest_overlay_4();
1403         of_selftest_overlay_5();
1404         of_selftest_overlay_6();
1405         of_selftest_overlay_8();
1406
1407 out:
1408         of_node_put(bus_np);
1409 }
1410
1411 #else
1412 static inline void __init of_selftest_overlay(void) { }
1413 #endif
1414
1415 static int __init of_selftest(void)
1416 {
1417         struct device_node *np;
1418         int res;
1419
1420         /* adding data for selftest */
1421         res = selftest_data_add();
1422         if (res)
1423                 return res;
1424         if (!of_aliases)
1425                 of_aliases = of_find_node_by_path("/aliases");
1426
1427         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
1428         if (!np) {
1429                 pr_info("No testcase data in device tree; not running tests\n");
1430                 return 0;
1431         }
1432         of_node_put(np);
1433
1434         pr_info("start of selftest - you will see error messages\n");
1435         of_selftest_check_tree_linkage();
1436         of_selftest_check_phandles();
1437         of_selftest_find_node_by_name();
1438         of_selftest_dynamic();
1439         of_selftest_parse_phandle_with_args();
1440         of_selftest_property_string();
1441         of_selftest_property_copy();
1442         of_selftest_changeset();
1443         of_selftest_parse_interrupts();
1444         of_selftest_parse_interrupts_extended();
1445         of_selftest_match_node();
1446         of_selftest_platform_populate();
1447         of_selftest_overlay();
1448
1449         /* removing selftest data from live tree */
1450         selftest_data_remove();
1451
1452         /* Double check linkage after removing testcase data */
1453         of_selftest_check_tree_linkage();
1454
1455         pr_info("end of selftest - %i passed, %i failed\n",
1456                 selftest_results.passed, selftest_results.failed);
1457
1458         return 0;
1459 }
1460 late_initcall(of_selftest);