drivers/of/selftest.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/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_fdt.h>
  13 #include <linux/of_irq.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/list.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19
  20 #include "of_private.h"
  21
  22 static struct selftest_results {
  23         int passed;
  24         int failed;
  25 } selftest_results;
  26
  27 #define NO_OF_NODES 2
  28 static struct device_node *nodes[NO_OF_NODES];
  29 static int last_node_index;
  30 static bool selftest_live_tree;
  31
  32 #define selftest(result, fmt, ...) { \
  33         if (!(result)) { \
  34                 selftest_results.failed++; \
  35                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  36         } else { \
  37                 selftest_results.passed++; \
  38                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  39         } \
  40 }
  41
  42 static void __init of_selftest_find_node_by_name(void)
  43 {
  44         struct device_node *np;
  45
  46         np = of_find_node_by_path("/testcase-data");
  47         selftest(np && !strcmp("/testcase-data", np->full_name),
  48                 "find /testcase-data failed\n");
  49         of_node_put(np);
  50
  51         /* Test if trailing '/' works */
  52         np = of_find_node_by_path("/testcase-data/");
  53         selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
  54
  55         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  56         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  57                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  58         of_node_put(np);
  59
  60         np = of_find_node_by_path("testcase-alias");
  61         selftest(np && !strcmp("/testcase-data", np->full_name),
  62                 "find testcase-alias failed\n");
  63         of_node_put(np);
  64
  65         /* Test if trailing '/' works on aliases */
  66         np = of_find_node_by_path("testcase-alias/");
  67         selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
  68
  69         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  70         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  71                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  72         of_node_put(np);
  73
  74         np = of_find_node_by_path("/testcase-data/missing-path");
  75         selftest(!np, "non-existent path returned node %s\n", np->full_name);
  76         of_node_put(np);
  77
  78         np = of_find_node_by_path("missing-alias");
  79         selftest(!np, "non-existent alias returned node %s\n", np->full_name);
  80         of_node_put(np);
  81
  82         np = of_find_node_by_path("testcase-alias/missing-path");
  83         selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  84         of_node_put(np);
  85 }
  86
  87 static void __init of_selftest_dynamic(void)
  88 {
  89         struct device_node *np;
  90         struct property *prop;
  91
  92         np = of_find_node_by_path("/testcase-data");
  93         if (!np) {
  94                 pr_err("missing testcase data\n");
  95                 return;
  96         }
  97
  98         /* Array of 4 properties for the purpose of testing */
  99         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 100         if (!prop) {
 101                 selftest(0, "kzalloc() failed\n");
 102                 return;
 103         }
 104
 105         /* Add a new property - should pass*/
 106         prop->name = "new-property";
 107         prop->value = "new-property-data";
 108         prop->length = strlen(prop->value);
 109         selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 110
 111         /* Try to add an existing property - should fail */
 112         prop++;
 113         prop->name = "new-property";
 114         prop->value = "new-property-data-should-fail";
 115         prop->length = strlen(prop->value);
 116         selftest(of_add_property(np, prop) != 0,
 117                  "Adding an existing property should have failed\n");
 118
 119         /* Try to modify an existing property - should pass */
 120         prop->value = "modify-property-data-should-pass";
 121         prop->length = strlen(prop->value);
 122         selftest(of_update_property(np, prop) == 0,
 123                  "Updating an existing property should have passed\n");
 124
 125         /* Try to modify non-existent property - should pass*/
 126         prop++;
 127         prop->name = "modify-property";
 128         prop->value = "modify-missing-property-data-should-pass";
 129         prop->length = strlen(prop->value);
 130         selftest(of_update_property(np, prop) == 0,
 131                  "Updating a missing property should have passed\n");
 132
 133         /* Remove property - should pass */
 134         selftest(of_remove_property(np, prop) == 0,
 135                  "Removing a property should have passed\n");
 136
 137         /* Adding very large property - should pass */
 138         prop++;
 139         prop->name = "large-property-PAGE_SIZEx8";
 140         prop->length = PAGE_SIZE * 8;
 141         prop->value = kzalloc(prop->length, GFP_KERNEL);
 142         selftest(prop->value != NULL, "Unable to allocate large buffer\n");
 143         if (prop->value)
 144                 selftest(of_add_property(np, prop) == 0,
 145                          "Adding a large property should have passed\n");
 146 }
 147
 148 static int __init of_selftest_check_node_linkage(struct device_node *np)
 149 {
 150         struct device_node *child, *allnext_index = np;
 151         int count = 0, rc;
 152
 153         for_each_child_of_node(np, child) {
 154                 if (child->parent != np) {
 155                         pr_err("Child node %s links to wrong parent %s\n",
 156                                  child->name, np->name);
 157                         return -EINVAL;
 158                 }
 159
 160                 while (allnext_index && allnext_index != child)
 161                         allnext_index = allnext_index->allnext;
 162                 if (allnext_index != child) {
 163                         pr_err("Node %s is ordered differently in sibling and allnode lists\n",
 164                                  child->name);
 165                         return -EINVAL;
 166                 }
 167
 168                 rc = of_selftest_check_node_linkage(child);
 169                 if (rc < 0)
 170                         return rc;
 171                 count += rc;
 172         }
 173
 174         return count + 1;
 175 }
 176
 177 static void __init of_selftest_check_tree_linkage(void)
 178 {
 179         struct device_node *np;
 180         int allnode_count = 0, child_count;
 181
 182         if (!of_allnodes)
 183                 return;
 184
 185         for_each_of_allnodes(np)
 186                 allnode_count++;
 187         child_count = of_selftest_check_node_linkage(of_allnodes);
 188
 189         selftest(child_count > 0, "Device node data structure is corrupted\n");
 190         selftest(child_count == allnode_count, "allnodes list size (%i) doesn't match"
 191                  "sibling lists size (%i)\n", allnode_count, child_count);
 192         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 193 }
 194
 195 static void __init of_selftest_parse_phandle_with_args(void)
 196 {
 197         struct device_node *np;
 198         struct of_phandle_args args;
 199         int i, rc;
 200
 201         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 202         if (!np) {
 203                 pr_err("missing testcase data\n");
 204                 return;
 205         }
 206
 207         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 208         selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 209
 210         for (i = 0; i < 8; i++) {
 211                 bool passed = true;
 212                 rc = of_parse_phandle_with_args(np, "phandle-list",
 213                                                 "#phandle-cells", i, &args);
 214
 215                 /* Test the values from tests-phandle.dtsi */
 216                 switch (i) {
 217                 case 0:
 218                         passed &= !rc;
 219                         passed &= (args.args_count == 1);
 220                         passed &= (args.args[0] == (i + 1));
 221                         break;
 222                 case 1:
 223                         passed &= !rc;
 224                         passed &= (args.args_count == 2);
 225                         passed &= (args.args[0] == (i + 1));
 226                         passed &= (args.args[1] == 0);
 227                         break;
 228                 case 2:
 229                         passed &= (rc == -ENOENT);
 230                         break;
 231                 case 3:
 232                         passed &= !rc;
 233                         passed &= (args.args_count == 3);
 234                         passed &= (args.args[0] == (i + 1));
 235                         passed &= (args.args[1] == 4);
 236                         passed &= (args.args[2] == 3);
 237                         break;
 238                 case 4:
 239                         passed &= !rc;
 240                         passed &= (args.args_count == 2);
 241                         passed &= (args.args[0] == (i + 1));
 242                         passed &= (args.args[1] == 100);
 243                         break;
 244                 case 5:
 245                         passed &= !rc;
 246                         passed &= (args.args_count == 0);
 247                         break;
 248                 case 6:
 249                         passed &= !rc;
 250                         passed &= (args.args_count == 1);
 251                         passed &= (args.args[0] == (i + 1));
 252                         break;
 253                 case 7:
 254                         passed &= (rc == -ENOENT);
 255                         break;
 256                 default:
 257                         passed = false;
 258                 }
 259
 260                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 261                          i, args.np->full_name, rc);
 262         }
 263
 264         /* Check for missing list property */
 265         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 266                                         "#phandle-cells", 0, &args);
 267         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 268         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 269                                         "#phandle-cells");
 270         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 271
 272         /* Check for missing cells property */
 273         rc = of_parse_phandle_with_args(np, "phandle-list",
 274                                         "#phandle-cells-missing", 0, &args);
 275         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 276         rc = of_count_phandle_with_args(np, "phandle-list",
 277                                         "#phandle-cells-missing");
 278         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 279
 280         /* Check for bad phandle in list */
 281         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 282                                         "#phandle-cells", 0, &args);
 283         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 284         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 285                                         "#phandle-cells");
 286         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 287
 288         /* Check for incorrectly formed argument list */
 289         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 290                                         "#phandle-cells", 1, &args);
 291         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 292         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 293                                         "#phandle-cells");
 294         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 295 }
 296
 297 static void __init of_selftest_property_match_string(void)
 298 {
 299         struct device_node *np;
 300         int rc;
 301
 302         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 303         if (!np) {
 304                 pr_err("No testcase data in device tree\n");
 305                 return;
 306         }
 307
 308         rc = of_property_match_string(np, "phandle-list-names", "first");
 309         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 310         rc = of_property_match_string(np, "phandle-list-names", "second");
 311         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 312         rc = of_property_match_string(np, "phandle-list-names", "third");
 313         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 314         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 315         selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
 316         rc = of_property_match_string(np, "missing-property", "blah");
 317         selftest(rc == -EINVAL, "missing property; rc=%i", rc);
 318         rc = of_property_match_string(np, "empty-property", "blah");
 319         selftest(rc == -ENODATA, "empty property; rc=%i", rc);
 320         rc = of_property_match_string(np, "unterminated-string", "blah");
 321         selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
 322 }
 323
 324 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 325                         (p1)->value && (p2)->value && \
 326                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 327                         !strcmp((p1)->name, (p2)->name))
 328 static void __init of_selftest_property_copy(void)
 329 {
 330 #ifdef CONFIG_OF_DYNAMIC
 331         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 332         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 333         struct property *new;
 334
 335         new = __of_prop_dup(&p1, GFP_KERNEL);
 336         selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 337         kfree(new->value);
 338         kfree(new->name);
 339         kfree(new);
 340
 341         new = __of_prop_dup(&p2, GFP_KERNEL);
 342         selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 343         kfree(new->value);
 344         kfree(new->name);
 345         kfree(new);
 346 #endif
 347 }
 348
 349 static void __init of_selftest_changeset(void)
 350 {
 351 #ifdef CONFIG_OF_DYNAMIC
 352         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 353         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 354         struct property *ppremove;
 355         struct device_node *n1, *n2, *n21, *nremove, *parent;
 356         struct of_changeset chgset;
 357
 358         of_changeset_init(&chgset);
 359         n1 = __of_node_alloc("/testcase-data/changeset/n1", GFP_KERNEL);
 360         selftest(n1, "testcase setup failure\n");
 361         n2 = __of_node_alloc("/testcase-data/changeset/n2", GFP_KERNEL);
 362         selftest(n2, "testcase setup failure\n");
 363         n21 = __of_node_alloc("/testcase-data/changeset/n2/n21", GFP_KERNEL);
 364         selftest(n21, "testcase setup failure %p\n", n21);
 365         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 366         selftest(nremove, "testcase setup failure\n");
 367         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 368         selftest(ppadd, "testcase setup failure\n");
 369         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 370         selftest(ppupdate, "testcase setup failure\n");
 371         parent = nremove->parent;
 372         n1->parent = parent;
 373         n2->parent = parent;
 374         n21->parent = n2;
 375         n2->child = n21;
 376         ppremove = of_find_property(parent, "prop-remove", NULL);
 377         selftest(ppremove, "failed to find removal prop");
 378
 379         of_changeset_init(&chgset);
 380         selftest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 381         selftest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 382         selftest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 383         selftest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 384         selftest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 385         selftest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 386         selftest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 387         mutex_lock(&of_mutex);
 388         selftest(!of_changeset_apply(&chgset), "apply failed\n");
 389         mutex_unlock(&of_mutex);
 390
 391         mutex_lock(&of_mutex);
 392         selftest(!of_changeset_revert(&chgset), "revert failed\n");
 393         mutex_unlock(&of_mutex);
 394
 395         of_changeset_destroy(&chgset);
 396 #endif
 397 }
 398
 399 static void __init of_selftest_parse_interrupts(void)
 400 {
 401         struct device_node *np;
 402         struct of_phandle_args args;
 403         int i, rc;
 404
 405         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 406         if (!np) {
 407                 pr_err("missing testcase data\n");
 408                 return;
 409         }
 410
 411         for (i = 0; i < 4; i++) {
 412                 bool passed = true;
 413                 args.args_count = 0;
 414                 rc = of_irq_parse_one(np, i, &args);
 415
 416                 passed &= !rc;
 417                 passed &= (args.args_count == 1);
 418                 passed &= (args.args[0] == (i + 1));
 419
 420                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 421                          i, args.np->full_name, rc);
 422         }
 423         of_node_put(np);
 424
 425         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 426         if (!np) {
 427                 pr_err("missing testcase data\n");
 428                 return;
 429         }
 430
 431         for (i = 0; i < 4; i++) {
 432                 bool passed = true;
 433                 args.args_count = 0;
 434                 rc = of_irq_parse_one(np, i, &args);
 435
 436                 /* Test the values from tests-phandle.dtsi */
 437                 switch (i) {
 438                 case 0:
 439                         passed &= !rc;
 440                         passed &= (args.args_count == 1);
 441                         passed &= (args.args[0] == 9);
 442                         break;
 443                 case 1:
 444                         passed &= !rc;
 445                         passed &= (args.args_count == 3);
 446                         passed &= (args.args[0] == 10);
 447                         passed &= (args.args[1] == 11);
 448                         passed &= (args.args[2] == 12);
 449                         break;
 450                 case 2:
 451                         passed &= !rc;
 452                         passed &= (args.args_count == 2);
 453                         passed &= (args.args[0] == 13);
 454                         passed &= (args.args[1] == 14);
 455                         break;
 456                 case 3:
 457                         passed &= !rc;
 458                         passed &= (args.args_count == 2);
 459                         passed &= (args.args[0] == 15);
 460                         passed &= (args.args[1] == 16);
 461                         break;
 462                 default:
 463                         passed = false;
 464                 }
 465                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 466                          i, args.np->full_name, rc);
 467         }
 468         of_node_put(np);
 469 }
 470
 471 static void __init of_selftest_parse_interrupts_extended(void)
 472 {
 473         struct device_node *np;
 474         struct of_phandle_args args;
 475         int i, rc;
 476
 477         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 478         if (!np) {
 479                 pr_err("missing testcase data\n");
 480                 return;
 481         }
 482
 483         for (i = 0; i < 7; i++) {
 484                 bool passed = true;
 485                 rc = of_irq_parse_one(np, i, &args);
 486
 487                 /* Test the values from tests-phandle.dtsi */
 488                 switch (i) {
 489                 case 0:
 490                         passed &= !rc;
 491                         passed &= (args.args_count == 1);
 492                         passed &= (args.args[0] == 1);
 493                         break;
 494                 case 1:
 495                         passed &= !rc;
 496                         passed &= (args.args_count == 3);
 497                         passed &= (args.args[0] == 2);
 498                         passed &= (args.args[1] == 3);
 499                         passed &= (args.args[2] == 4);
 500                         break;
 501                 case 2:
 502                         passed &= !rc;
 503                         passed &= (args.args_count == 2);
 504                         passed &= (args.args[0] == 5);
 505                         passed &= (args.args[1] == 6);
 506                         break;
 507                 case 3:
 508                         passed &= !rc;
 509                         passed &= (args.args_count == 1);
 510                         passed &= (args.args[0] == 9);
 511                         break;
 512                 case 4:
 513                         passed &= !rc;
 514                         passed &= (args.args_count == 3);
 515                         passed &= (args.args[0] == 10);
 516                         passed &= (args.args[1] == 11);
 517                         passed &= (args.args[2] == 12);
 518                         break;
 519                 case 5:
 520                         passed &= !rc;
 521                         passed &= (args.args_count == 2);
 522                         passed &= (args.args[0] == 13);
 523                         passed &= (args.args[1] == 14);
 524                         break;
 525                 case 6:
 526                         passed &= !rc;
 527                         passed &= (args.args_count == 1);
 528                         passed &= (args.args[0] == 15);
 529                         break;
 530                 default:
 531                         passed = false;
 532                 }
 533
 534                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 535                          i, args.np->full_name, rc);
 536         }
 537         of_node_put(np);
 538 }
 539
 540 static struct of_device_id match_node_table[] = {
 541         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 542         { .data = "B", .type = "type1", }, /* followed by type alone */
 543
 544         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 545         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 546         { .data = "Cc", .name = "name2", .type = "type2", },
 547
 548         { .data = "E", .compatible = "compat3" },
 549         { .data = "G", .compatible = "compat2", },
 550         { .data = "H", .compatible = "compat2", .name = "name5", },
 551         { .data = "I", .compatible = "compat2", .type = "type1", },
 552         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 553         { .data = "K", .compatible = "compat2", .name = "name9", },
 554         {}
 555 };
 556
 557 static struct {
 558         const char *path;
 559         const char *data;
 560 } match_node_tests[] = {
 561         { .path = "/testcase-data/match-node/name0", .data = "A", },
 562         { .path = "/testcase-data/match-node/name1", .data = "B", },
 563         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 564         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 565         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 566         { .path = "/testcase-data/match-node/name3", .data = "E", },
 567         { .path = "/testcase-data/match-node/name4", .data = "G", },
 568         { .path = "/testcase-data/match-node/name5", .data = "H", },
 569         { .path = "/testcase-data/match-node/name6", .data = "G", },
 570         { .path = "/testcase-data/match-node/name7", .data = "I", },
 571         { .path = "/testcase-data/match-node/name8", .data = "J", },
 572         { .path = "/testcase-data/match-node/name9", .data = "K", },
 573 };
 574
 575 static void __init of_selftest_match_node(void)
 576 {
 577         struct device_node *np;
 578         const struct of_device_id *match;
 579         int i;
 580
 581         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 582                 np = of_find_node_by_path(match_node_tests[i].path);
 583                 if (!np) {
 584                         selftest(0, "missing testcase node %s\n",
 585                                 match_node_tests[i].path);
 586                         continue;
 587                 }
 588
 589                 match = of_match_node(match_node_table, np);
 590                 if (!match) {
 591                         selftest(0, "%s didn't match anything\n",
 592                                 match_node_tests[i].path);
 593                         continue;
 594                 }
 595
 596                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 597                         selftest(0, "%s got wrong match. expected %s, got %s\n",
 598                                 match_node_tests[i].path, match_node_tests[i].data,
 599                                 (const char *)match->data);
 600                         continue;
 601                 }
 602                 selftest(1, "passed");
 603         }
 604 }
 605
 606 static void __init of_selftest_platform_populate(void)
 607 {
 608         int irq;
 609         struct device_node *np, *child;
 610         struct platform_device *pdev;
 611         struct of_device_id match[] = {
 612                 { .compatible = "test-device", },
 613                 {}
 614         };
 615
 616         np = of_find_node_by_path("/testcase-data");
 617         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 618
 619         /* Test that a missing irq domain returns -EPROBE_DEFER */
 620         np = of_find_node_by_path("/testcase-data/testcase-device1");
 621         pdev = of_find_device_by_node(np);
 622         selftest(pdev, "device 1 creation failed\n");
 623
 624         irq = platform_get_irq(pdev, 0);
 625         selftest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 626
 627         /* Test that a parsing failure does not return -EPROBE_DEFER */
 628         np = of_find_node_by_path("/testcase-data/testcase-device2");
 629         pdev = of_find_device_by_node(np);
 630         selftest(pdev, "device 2 creation failed\n");
 631         irq = platform_get_irq(pdev, 0);
 632         selftest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 633
 634         np = of_find_node_by_path("/testcase-data/platform-tests");
 635         if (!np) {
 636                 pr_err("No testcase data in device tree\n");
 637                 return;
 638         }
 639
 640         for_each_child_of_node(np, child) {
 641                 struct device_node *grandchild;
 642                 of_platform_populate(child, match, NULL, NULL);
 643                 for_each_child_of_node(child, grandchild)
 644                         selftest(of_find_device_by_node(grandchild),
 645                                  "Could not create device for node '%s'\n",
 646                                  grandchild->name);
 647         }
 648 }
 649
 650 /**
 651  *      update_node_properties - adds the properties
 652  *      of np into dup node (present in live tree) and
 653  *      updates parent of children of np to dup.
 654  *
 655  *      @np:    node already present in live tree
 656  *      @dup:   node present in live tree to be updated
 657  */
 658 static void update_node_properties(struct device_node *np,
 659                                         struct device_node *dup)
 660 {
 661         struct property *prop;
 662         struct device_node *child;
 663
 664         for_each_property_of_node(np, prop)
 665                 of_add_property(dup, prop);
 666
 667         for_each_child_of_node(np, child)
 668                 child->parent = dup;
 669 }
 670
 671 /**
 672  *      attach_node_and_children - attaches nodes
 673  *      and its children to live tree
 674  *
 675  *      @np:    Node to attach to live tree
 676  */
 677 static int attach_node_and_children(struct device_node *np)
 678 {
 679         struct device_node *next, *root = np, *dup;
 680
 681         /* skip root node */
 682         np = np->child;
 683         /* storing a copy in temporary node */
 684         dup = np;
 685
 686         while (dup) {
 687                 if (WARN_ON(last_node_index >= NO_OF_NODES))
 688                         return -EINVAL;
 689                 nodes[last_node_index++] = dup;
 690                 dup = dup->sibling;
 691         }
 692         dup = NULL;
 693
 694         while (np) {
 695                 next = np->allnext;
 696                 dup = of_find_node_by_path(np->full_name);
 697                 if (dup)
 698                         update_node_properties(np, dup);
 699                 else {
 700                         np->child = NULL;
 701                         if (np->parent == root)
 702                                 np->parent = of_allnodes;
 703                         of_attach_node(np);
 704                 }
 705                 np = next;
 706         }
 707
 708         return 0;
 709 }
 710
 711 /**
 712  *      selftest_data_add - Reads, copies data from
 713  *      linked tree and attaches it to the live tree
 714  */
 715 static int __init selftest_data_add(void)
 716 {
 717         void *selftest_data;
 718         struct device_node *selftest_data_node, *np;
 719         extern uint8_t __dtb_testcases_begin[];
 720         extern uint8_t __dtb_testcases_end[];
 721         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 722
 723         if (!size) {
 724                 pr_warn("%s: No testcase data to attach; not running tests\n",
 725                         __func__);
 726                 return -ENODATA;
 727         }
 728
 729         /* creating copy */
 730         selftest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 731
 732         if (!selftest_data) {
 733                 pr_warn("%s: Failed to allocate memory for selftest_data; "
 734                         "not running tests\n", __func__);
 735                 return -ENOMEM;
 736         }
 737         of_fdt_unflatten_tree(selftest_data, &selftest_data_node);
 738         if (!selftest_data_node) {
 739                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 740                 return -ENODATA;
 741         }
 742
 743         if (!of_allnodes) {
 744                 /* enabling flag for removing nodes */
 745                 selftest_live_tree = true;
 746                 of_allnodes = selftest_data_node;
 747
 748                 for_each_of_allnodes(np)
 749                         __of_attach_node_sysfs(np);
 750                 of_aliases = of_find_node_by_path("/aliases");
 751                 of_chosen = of_find_node_by_path("/chosen");
 752                 return 0;
 753         }
 754
 755         /* attach the sub-tree to live tree */
 756         return attach_node_and_children(selftest_data_node);
 757 }
 758
 759 /**
 760  *      detach_node_and_children - detaches node
 761  *      and its children from live tree
 762  *
 763  *      @np:    Node to detach from live tree
 764  */
 765 static void detach_node_and_children(struct device_node *np)
 766 {
 767         while (np->child)
 768                 detach_node_and_children(np->child);
 769         of_detach_node(np);
 770 }
 771
 772 /**
 773  *      selftest_data_remove - removes the selftest data
 774  *      nodes from the live tree
 775  */
 776 static void selftest_data_remove(void)
 777 {
 778         struct device_node *np;
 779         struct property *prop;
 780
 781         if (selftest_live_tree) {
 782                 of_node_put(of_aliases);
 783                 of_node_put(of_chosen);
 784                 of_aliases = NULL;
 785                 of_chosen = NULL;
 786                 for_each_child_of_node(of_allnodes, np)
 787                         detach_node_and_children(np);
 788                 __of_detach_node_sysfs(of_allnodes);
 789                 of_allnodes = NULL;
 790                 return;
 791         }
 792
 793         while (last_node_index >= 0) {
 794                 if (nodes[last_node_index]) {
 795                         np = of_find_node_by_path(nodes[last_node_index]->full_name);
 796                         if (strcmp(np->full_name, "/aliases") != 0) {
 797                                 detach_node_and_children(np);
 798                         } else {
 799                                 for_each_property_of_node(np, prop) {
 800                                         if (strcmp(prop->name, "testcase-alias") == 0)
 801                                                 of_remove_property(np, prop);
 802                                 }
 803                         }
 804                 }
 805                 last_node_index--;
 806         }
 807 }
 808
 809 static int __init of_selftest(void)
 810 {
 811         struct device_node *np;
 812         int res;
 813
 814         /* adding data for selftest */
 815         res = selftest_data_add();
 816         if (res)
 817                 return res;
 818
 819         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 820         if (!np) {
 821                 pr_info("No testcase data in device tree; not running tests\n");
 822                 return 0;
 823         }
 824         of_node_put(np);
 825
 826         pr_info("start of selftest - you will see error messages\n");
 827         of_selftest_check_tree_linkage();
 828         of_selftest_find_node_by_name();
 829         of_selftest_dynamic();
 830         of_selftest_parse_phandle_with_args();
 831         of_selftest_property_match_string();
 832         of_selftest_property_copy();
 833         of_selftest_changeset();
 834         of_selftest_parse_interrupts();
 835         of_selftest_parse_interrupts_extended();
 836         of_selftest_match_node();
 837         of_selftest_platform_populate();
 838
 839         /* removing selftest data from live tree */
 840         selftest_data_remove();
 841
 842         /* Double check linkage after removing testcase data */
 843         of_selftest_check_tree_linkage();
 844
 845         pr_info("end of selftest - %i passed, %i failed\n",
 846                 selftest_results.passed, selftest_results.failed);
 847
 848         return 0;
 849 }
 850 late_initcall(of_selftest);