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 <linux/i2c.h>
  24 #include <linux/i2c-mux.h>
  25
  26 #include "of_private.h"
  27
  28 static struct selftest_results {
  29         int passed;
  30         int failed;
  31 } selftest_results;
  32
  33 #define selftest(result, fmt, ...) ({ \
  34         bool failed = !(result); \
  35         if (failed) { \
  36                 selftest_results.failed++; \
  37                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  38         } else { \
  39                 selftest_results.passed++; \
  40                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  41         } \
  42         failed; \
  43 })
  44
  45 static void __init of_selftest_find_node_by_name(void)
  46 {
  47         struct device_node *np;
  48         const char *options;
  49
  50         np = of_find_node_by_path("/testcase-data");
  51         selftest(np && !strcmp("/testcase-data", np->full_name),
  52                 "find /testcase-data failed\n");
  53         of_node_put(np);
  54
  55         /* Test if trailing '/' works */
  56         np = of_find_node_by_path("/testcase-data/");
  57         selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
  58
  59         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  60         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  61                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  62         of_node_put(np);
  63
  64         np = of_find_node_by_path("testcase-alias");
  65         selftest(np && !strcmp("/testcase-data", np->full_name),
  66                 "find testcase-alias failed\n");
  67         of_node_put(np);
  68
  69         /* Test if trailing '/' works on aliases */
  70         np = of_find_node_by_path("testcase-alias/");
  71         selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
  72
  73         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  74         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  75                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  76         of_node_put(np);
  77
  78         np = of_find_node_by_path("/testcase-data/missing-path");
  79         selftest(!np, "non-existent path returned node %s\n", np->full_name);
  80         of_node_put(np);
  81
  82         np = of_find_node_by_path("missing-alias");
  83         selftest(!np, "non-existent alias returned node %s\n", np->full_name);
  84         of_node_put(np);
  85
  86         np = of_find_node_by_path("testcase-alias/missing-path");
  87         selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  88         of_node_put(np);
  89
  90         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
  91         selftest(np && !strcmp("testoption", options),
  92                  "option path test failed\n");
  93         of_node_put(np);
  94
  95         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
  96         selftest(np, "NULL option path test failed\n");
  97         of_node_put(np);
  98
  99         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 100                                        &options);
 101         selftest(np && !strcmp("testaliasoption", options),
 102                  "option alias path test failed\n");
 103         of_node_put(np);
 104
 105         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 106         selftest(np, "NULL option alias path test failed\n");
 107         of_node_put(np);
 108
 109         options = "testoption";
 110         np = of_find_node_opts_by_path("testcase-alias", &options);
 111         selftest(np && !options, "option clearing test failed\n");
 112         of_node_put(np);
 113
 114         options = "testoption";
 115         np = of_find_node_opts_by_path("/", &options);
 116         selftest(np && !options, "option clearing root node test failed\n");
 117         of_node_put(np);
 118 }
 119
 120 static void __init of_selftest_dynamic(void)
 121 {
 122         struct device_node *np;
 123         struct property *prop;
 124
 125         np = of_find_node_by_path("/testcase-data");
 126         if (!np) {
 127                 pr_err("missing testcase data\n");
 128                 return;
 129         }
 130
 131         /* Array of 4 properties for the purpose of testing */
 132         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 133         if (!prop) {
 134                 selftest(0, "kzalloc() failed\n");
 135                 return;
 136         }
 137
 138         /* Add a new property - should pass*/
 139         prop->name = "new-property";
 140         prop->value = "new-property-data";
 141         prop->length = strlen(prop->value);
 142         selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 143
 144         /* Try to add an existing property - should fail */
 145         prop++;
 146         prop->name = "new-property";
 147         prop->value = "new-property-data-should-fail";
 148         prop->length = strlen(prop->value);
 149         selftest(of_add_property(np, prop) != 0,
 150                  "Adding an existing property should have failed\n");
 151
 152         /* Try to modify an existing property - should pass */
 153         prop->value = "modify-property-data-should-pass";
 154         prop->length = strlen(prop->value);
 155         selftest(of_update_property(np, prop) == 0,
 156                  "Updating an existing property should have passed\n");
 157
 158         /* Try to modify non-existent property - should pass*/
 159         prop++;
 160         prop->name = "modify-property";
 161         prop->value = "modify-missing-property-data-should-pass";
 162         prop->length = strlen(prop->value);
 163         selftest(of_update_property(np, prop) == 0,
 164                  "Updating a missing property should have passed\n");
 165
 166         /* Remove property - should pass */
 167         selftest(of_remove_property(np, prop) == 0,
 168                  "Removing a property should have passed\n");
 169
 170         /* Adding very large property - should pass */
 171         prop++;
 172         prop->name = "large-property-PAGE_SIZEx8";
 173         prop->length = PAGE_SIZE * 8;
 174         prop->value = kzalloc(prop->length, GFP_KERNEL);
 175         selftest(prop->value != NULL, "Unable to allocate large buffer\n");
 176         if (prop->value)
 177                 selftest(of_add_property(np, prop) == 0,
 178                          "Adding a large property should have passed\n");
 179 }
 180
 181 static int __init of_selftest_check_node_linkage(struct device_node *np)
 182 {
 183         struct device_node *child;
 184         int count = 0, rc;
 185
 186         for_each_child_of_node(np, child) {
 187                 if (child->parent != np) {
 188                         pr_err("Child node %s links to wrong parent %s\n",
 189                                  child->name, np->name);
 190                         return -EINVAL;
 191                 }
 192
 193                 rc = of_selftest_check_node_linkage(child);
 194                 if (rc < 0)
 195                         return rc;
 196                 count += rc;
 197         }
 198
 199         return count + 1;
 200 }
 201
 202 static void __init of_selftest_check_tree_linkage(void)
 203 {
 204         struct device_node *np;
 205         int allnode_count = 0, child_count;
 206
 207         if (!of_root)
 208                 return;
 209
 210         for_each_of_allnodes(np)
 211                 allnode_count++;
 212         child_count = of_selftest_check_node_linkage(of_root);
 213
 214         selftest(child_count > 0, "Device node data structure is corrupted\n");
 215         selftest(child_count == allnode_count, "allnodes list size (%i) doesn't match"
 216                  "sibling lists size (%i)\n", allnode_count, child_count);
 217         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 218 }
 219
 220 struct node_hash {
 221         struct hlist_node node;
 222         struct device_node *np;
 223 };
 224
 225 static DEFINE_HASHTABLE(phandle_ht, 8);
 226 static void __init of_selftest_check_phandles(void)
 227 {
 228         struct device_node *np;
 229         struct node_hash *nh;
 230         struct hlist_node *tmp;
 231         int i, dup_count = 0, phandle_count = 0;
 232
 233         for_each_of_allnodes(np) {
 234                 if (!np->phandle)
 235                         continue;
 236
 237                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 238                         if (nh->np->phandle == np->phandle) {
 239                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 240                                         np->phandle, nh->np->full_name, np->full_name);
 241                                 dup_count++;
 242                                 break;
 243                         }
 244                 }
 245
 246                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 247                 if (WARN_ON(!nh))
 248                         return;
 249
 250                 nh->np = np;
 251                 hash_add(phandle_ht, &nh->node, np->phandle);
 252                 phandle_count++;
 253         }
 254         selftest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 255                  dup_count, phandle_count);
 256
 257         /* Clean up */
 258         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 259                 hash_del(&nh->node);
 260                 kfree(nh);
 261         }
 262 }
 263
 264 static void __init of_selftest_parse_phandle_with_args(void)
 265 {
 266         struct device_node *np;
 267         struct of_phandle_args args;
 268         int i, rc;
 269
 270         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 271         if (!np) {
 272                 pr_err("missing testcase data\n");
 273                 return;
 274         }
 275
 276         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 277         selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 278
 279         for (i = 0; i < 8; i++) {
 280                 bool passed = true;
 281                 rc = of_parse_phandle_with_args(np, "phandle-list",
 282                                                 "#phandle-cells", i, &args);
 283
 284                 /* Test the values from tests-phandle.dtsi */
 285                 switch (i) {
 286                 case 0:
 287                         passed &= !rc;
 288                         passed &= (args.args_count == 1);
 289                         passed &= (args.args[0] == (i + 1));
 290                         break;
 291                 case 1:
 292                         passed &= !rc;
 293                         passed &= (args.args_count == 2);
 294                         passed &= (args.args[0] == (i + 1));
 295                         passed &= (args.args[1] == 0);
 296                         break;
 297                 case 2:
 298                         passed &= (rc == -ENOENT);
 299                         break;
 300                 case 3:
 301                         passed &= !rc;
 302                         passed &= (args.args_count == 3);
 303                         passed &= (args.args[0] == (i + 1));
 304                         passed &= (args.args[1] == 4);
 305                         passed &= (args.args[2] == 3);
 306                         break;
 307                 case 4:
 308                         passed &= !rc;
 309                         passed &= (args.args_count == 2);
 310                         passed &= (args.args[0] == (i + 1));
 311                         passed &= (args.args[1] == 100);
 312                         break;
 313                 case 5:
 314                         passed &= !rc;
 315                         passed &= (args.args_count == 0);
 316                         break;
 317                 case 6:
 318                         passed &= !rc;
 319                         passed &= (args.args_count == 1);
 320                         passed &= (args.args[0] == (i + 1));
 321                         break;
 322                 case 7:
 323                         passed &= (rc == -ENOENT);
 324                         break;
 325                 default:
 326                         passed = false;
 327                 }
 328
 329                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 330                          i, args.np->full_name, rc);
 331         }
 332
 333         /* Check for missing list property */
 334         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 335                                         "#phandle-cells", 0, &args);
 336         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 337         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 338                                         "#phandle-cells");
 339         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 340
 341         /* Check for missing cells property */
 342         rc = of_parse_phandle_with_args(np, "phandle-list",
 343                                         "#phandle-cells-missing", 0, &args);
 344         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 345         rc = of_count_phandle_with_args(np, "phandle-list",
 346                                         "#phandle-cells-missing");
 347         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 348
 349         /* Check for bad phandle in list */
 350         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 351                                         "#phandle-cells", 0, &args);
 352         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 353         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 354                                         "#phandle-cells");
 355         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 356
 357         /* Check for incorrectly formed argument list */
 358         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 359                                         "#phandle-cells", 1, &args);
 360         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 361         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 362                                         "#phandle-cells");
 363         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 364 }
 365
 366 static void __init of_selftest_property_string(void)
 367 {
 368         const char *strings[4];
 369         struct device_node *np;
 370         int rc;
 371
 372         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 373         if (!np) {
 374                 pr_err("No testcase data in device tree\n");
 375                 return;
 376         }
 377
 378         rc = of_property_match_string(np, "phandle-list-names", "first");
 379         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 380         rc = of_property_match_string(np, "phandle-list-names", "second");
 381         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 382         rc = of_property_match_string(np, "phandle-list-names", "third");
 383         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 384         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 385         selftest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 386         rc = of_property_match_string(np, "missing-property", "blah");
 387         selftest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 388         rc = of_property_match_string(np, "empty-property", "blah");
 389         selftest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 390         rc = of_property_match_string(np, "unterminated-string", "blah");
 391         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 392
 393         /* of_property_count_strings() tests */
 394         rc = of_property_count_strings(np, "string-property");
 395         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 396         rc = of_property_count_strings(np, "phandle-list-names");
 397         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 398         rc = of_property_count_strings(np, "unterminated-string");
 399         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 400         rc = of_property_count_strings(np, "unterminated-string-list");
 401         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 402
 403         /* of_property_read_string_index() tests */
 404         rc = of_property_read_string_index(np, "string-property", 0, strings);
 405         selftest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 406         strings[0] = NULL;
 407         rc = of_property_read_string_index(np, "string-property", 1, strings);
 408         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 409         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 410         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 411         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 412         selftest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 413         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 414         selftest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 415         strings[0] = NULL;
 416         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 417         selftest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 418         strings[0] = NULL;
 419         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 420         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 421         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 422         selftest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 423         strings[0] = NULL;
 424         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 425         selftest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 426         strings[1] = NULL;
 427
 428         /* of_property_read_string_array() tests */
 429         rc = of_property_read_string_array(np, "string-property", strings, 4);
 430         selftest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 431         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 432         selftest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 433         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 434         selftest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 435         /* -- An incorrectly formed string should cause a failure */
 436         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 437         selftest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 438         /* -- parsing the correctly formed strings should still work: */
 439         strings[2] = NULL;
 440         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 441         selftest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 442         strings[1] = NULL;
 443         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 444         selftest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 445 }
 446
 447 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 448                         (p1)->value && (p2)->value && \
 449                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 450                         !strcmp((p1)->name, (p2)->name))
 451 static void __init of_selftest_property_copy(void)
 452 {
 453 #ifdef CONFIG_OF_DYNAMIC
 454         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 455         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 456         struct property *new;
 457
 458         new = __of_prop_dup(&p1, GFP_KERNEL);
 459         selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 460         kfree(new->value);
 461         kfree(new->name);
 462         kfree(new);
 463
 464         new = __of_prop_dup(&p2, GFP_KERNEL);
 465         selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 466         kfree(new->value);
 467         kfree(new->name);
 468         kfree(new);
 469 #endif
 470 }
 471
 472 static void __init of_selftest_changeset(void)
 473 {
 474 #ifdef CONFIG_OF_DYNAMIC
 475         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 476         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 477         struct property *ppremove;
 478         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 479         struct of_changeset chgset;
 480
 481         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 482         selftest(n1, "testcase setup failure\n");
 483         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 484         selftest(n2, "testcase setup failure\n");
 485         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 486         selftest(n21, "testcase setup failure %p\n", n21);
 487         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 488         selftest(nremove, "testcase setup failure\n");
 489         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 490         selftest(ppadd, "testcase setup failure\n");
 491         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 492         selftest(ppupdate, "testcase setup failure\n");
 493         parent = nremove->parent;
 494         n1->parent = parent;
 495         n2->parent = parent;
 496         n21->parent = n2;
 497         n2->child = n21;
 498         ppremove = of_find_property(parent, "prop-remove", NULL);
 499         selftest(ppremove, "failed to find removal prop");
 500
 501         of_changeset_init(&chgset);
 502         selftest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 503         selftest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 504         selftest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 505         selftest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 506         selftest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 507         selftest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 508         selftest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 509         mutex_lock(&of_mutex);
 510         selftest(!of_changeset_apply(&chgset), "apply failed\n");
 511         mutex_unlock(&of_mutex);
 512
 513         /* Make sure node names are constructed correctly */
 514         selftest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 515                  "'%s' not added\n", n21->full_name);
 516         of_node_put(np);
 517
 518         mutex_lock(&of_mutex);
 519         selftest(!of_changeset_revert(&chgset), "revert failed\n");
 520         mutex_unlock(&of_mutex);
 521
 522         of_changeset_destroy(&chgset);
 523 #endif
 524 }
 525
 526 static void __init of_selftest_parse_interrupts(void)
 527 {
 528         struct device_node *np;
 529         struct of_phandle_args args;
 530         int i, rc;
 531
 532         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 533         if (!np) {
 534                 pr_err("missing testcase data\n");
 535                 return;
 536         }
 537
 538         for (i = 0; i < 4; i++) {
 539                 bool passed = true;
 540                 args.args_count = 0;
 541                 rc = of_irq_parse_one(np, i, &args);
 542
 543                 passed &= !rc;
 544                 passed &= (args.args_count == 1);
 545                 passed &= (args.args[0] == (i + 1));
 546
 547                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 548                          i, args.np->full_name, rc);
 549         }
 550         of_node_put(np);
 551
 552         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 553         if (!np) {
 554                 pr_err("missing testcase data\n");
 555                 return;
 556         }
 557
 558         for (i = 0; i < 4; i++) {
 559                 bool passed = true;
 560                 args.args_count = 0;
 561                 rc = of_irq_parse_one(np, i, &args);
 562
 563                 /* Test the values from tests-phandle.dtsi */
 564                 switch (i) {
 565                 case 0:
 566                         passed &= !rc;
 567                         passed &= (args.args_count == 1);
 568                         passed &= (args.args[0] == 9);
 569                         break;
 570                 case 1:
 571                         passed &= !rc;
 572                         passed &= (args.args_count == 3);
 573                         passed &= (args.args[0] == 10);
 574                         passed &= (args.args[1] == 11);
 575                         passed &= (args.args[2] == 12);
 576                         break;
 577                 case 2:
 578                         passed &= !rc;
 579                         passed &= (args.args_count == 2);
 580                         passed &= (args.args[0] == 13);
 581                         passed &= (args.args[1] == 14);
 582                         break;
 583                 case 3:
 584                         passed &= !rc;
 585                         passed &= (args.args_count == 2);
 586                         passed &= (args.args[0] == 15);
 587                         passed &= (args.args[1] == 16);
 588                         break;
 589                 default:
 590                         passed = false;
 591                 }
 592                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 593                          i, args.np->full_name, rc);
 594         }
 595         of_node_put(np);
 596 }
 597
 598 static void __init of_selftest_parse_interrupts_extended(void)
 599 {
 600         struct device_node *np;
 601         struct of_phandle_args args;
 602         int i, rc;
 603
 604         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 605         if (!np) {
 606                 pr_err("missing testcase data\n");
 607                 return;
 608         }
 609
 610         for (i = 0; i < 7; i++) {
 611                 bool passed = true;
 612                 rc = of_irq_parse_one(np, i, &args);
 613
 614                 /* Test the values from tests-phandle.dtsi */
 615                 switch (i) {
 616                 case 0:
 617                         passed &= !rc;
 618                         passed &= (args.args_count == 1);
 619                         passed &= (args.args[0] == 1);
 620                         break;
 621                 case 1:
 622                         passed &= !rc;
 623                         passed &= (args.args_count == 3);
 624                         passed &= (args.args[0] == 2);
 625                         passed &= (args.args[1] == 3);
 626                         passed &= (args.args[2] == 4);
 627                         break;
 628                 case 2:
 629                         passed &= !rc;
 630                         passed &= (args.args_count == 2);
 631                         passed &= (args.args[0] == 5);
 632                         passed &= (args.args[1] == 6);
 633                         break;
 634                 case 3:
 635                         passed &= !rc;
 636                         passed &= (args.args_count == 1);
 637                         passed &= (args.args[0] == 9);
 638                         break;
 639                 case 4:
 640                         passed &= !rc;
 641                         passed &= (args.args_count == 3);
 642                         passed &= (args.args[0] == 10);
 643                         passed &= (args.args[1] == 11);
 644                         passed &= (args.args[2] == 12);
 645                         break;
 646                 case 5:
 647                         passed &= !rc;
 648                         passed &= (args.args_count == 2);
 649                         passed &= (args.args[0] == 13);
 650                         passed &= (args.args[1] == 14);
 651                         break;
 652                 case 6:
 653                         passed &= !rc;
 654                         passed &= (args.args_count == 1);
 655                         passed &= (args.args[0] == 15);
 656                         break;
 657                 default:
 658                         passed = false;
 659                 }
 660
 661                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 662                          i, args.np->full_name, rc);
 663         }
 664         of_node_put(np);
 665 }
 666
 667 static struct of_device_id match_node_table[] = {
 668         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 669         { .data = "B", .type = "type1", }, /* followed by type alone */
 670
 671         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 672         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 673         { .data = "Cc", .name = "name2", .type = "type2", },
 674
 675         { .data = "E", .compatible = "compat3" },
 676         { .data = "G", .compatible = "compat2", },
 677         { .data = "H", .compatible = "compat2", .name = "name5", },
 678         { .data = "I", .compatible = "compat2", .type = "type1", },
 679         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 680         { .data = "K", .compatible = "compat2", .name = "name9", },
 681         {}
 682 };
 683
 684 static struct {
 685         const char *path;
 686         const char *data;
 687 } match_node_tests[] = {
 688         { .path = "/testcase-data/match-node/name0", .data = "A", },
 689         { .path = "/testcase-data/match-node/name1", .data = "B", },
 690         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 691         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 692         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 693         { .path = "/testcase-data/match-node/name3", .data = "E", },
 694         { .path = "/testcase-data/match-node/name4", .data = "G", },
 695         { .path = "/testcase-data/match-node/name5", .data = "H", },
 696         { .path = "/testcase-data/match-node/name6", .data = "G", },
 697         { .path = "/testcase-data/match-node/name7", .data = "I", },
 698         { .path = "/testcase-data/match-node/name8", .data = "J", },
 699         { .path = "/testcase-data/match-node/name9", .data = "K", },
 700 };
 701
 702 static void __init of_selftest_match_node(void)
 703 {
 704         struct device_node *np;
 705         const struct of_device_id *match;
 706         int i;
 707
 708         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 709                 np = of_find_node_by_path(match_node_tests[i].path);
 710                 if (!np) {
 711                         selftest(0, "missing testcase node %s\n",
 712                                 match_node_tests[i].path);
 713                         continue;
 714                 }
 715
 716                 match = of_match_node(match_node_table, np);
 717                 if (!match) {
 718                         selftest(0, "%s didn't match anything\n",
 719                                 match_node_tests[i].path);
 720                         continue;
 721                 }
 722
 723                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 724                         selftest(0, "%s got wrong match. expected %s, got %s\n",
 725                                 match_node_tests[i].path, match_node_tests[i].data,
 726                                 (const char *)match->data);
 727                         continue;
 728                 }
 729                 selftest(1, "passed");
 730         }
 731 }
 732
 733 struct device test_bus = {
 734         .init_name = "unittest-bus",
 735 };
 736 static void __init of_selftest_platform_populate(void)
 737 {
 738         int irq, rc;
 739         struct device_node *np, *child, *grandchild;
 740         struct platform_device *pdev;
 741         struct of_device_id match[] = {
 742                 { .compatible = "test-device", },
 743                 {}
 744         };
 745
 746         np = of_find_node_by_path("/testcase-data");
 747         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 748
 749         /* Test that a missing irq domain returns -EPROBE_DEFER */
 750         np = of_find_node_by_path("/testcase-data/testcase-device1");
 751         pdev = of_find_device_by_node(np);
 752         selftest(pdev, "device 1 creation failed\n");
 753
 754         irq = platform_get_irq(pdev, 0);
 755         selftest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 756
 757         /* Test that a parsing failure does not return -EPROBE_DEFER */
 758         np = of_find_node_by_path("/testcase-data/testcase-device2");
 759         pdev = of_find_device_by_node(np);
 760         selftest(pdev, "device 2 creation failed\n");
 761         irq = platform_get_irq(pdev, 0);
 762         selftest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 763
 764         if (selftest(np = of_find_node_by_path("/testcase-data/platform-tests"),
 765                      "No testcase data in device tree\n"));
 766                 return;
 767
 768         if (selftest(!(rc = device_register(&test_bus)),
 769                      "testbus registration failed; rc=%i\n", rc));
 770                 return;
 771
 772         for_each_child_of_node(np, child) {
 773                 of_platform_populate(child, match, NULL, &test_bus);
 774                 for_each_child_of_node(child, grandchild)
 775                         selftest(of_find_device_by_node(grandchild),
 776                                  "Could not create device for node '%s'\n",
 777                                  grandchild->name);
 778         }
 779
 780         of_platform_depopulate(&test_bus);
 781         for_each_child_of_node(np, child) {
 782                 for_each_child_of_node(child, grandchild)
 783                         selftest(!of_find_device_by_node(grandchild),
 784                                  "device didn't get destroyed '%s'\n",
 785                                  grandchild->name);
 786         }
 787
 788         device_unregister(&test_bus);
 789         of_node_put(np);
 790 }
 791
 792 /**
 793  *      update_node_properties - adds the properties
 794  *      of np into dup node (present in live tree) and
 795  *      updates parent of children of np to dup.
 796  *
 797  *      @np:    node already present in live tree
 798  *      @dup:   node present in live tree to be updated
 799  */
 800 static void update_node_properties(struct device_node *np,
 801                                         struct device_node *dup)
 802 {
 803         struct property *prop;
 804         struct device_node *child;
 805
 806         for_each_property_of_node(np, prop)
 807                 of_add_property(dup, prop);
 808
 809         for_each_child_of_node(np, child)
 810                 child->parent = dup;
 811 }
 812
 813 /**
 814  *      attach_node_and_children - attaches nodes
 815  *      and its children to live tree
 816  *
 817  *      @np:    Node to attach to live tree
 818  */
 819 static int attach_node_and_children(struct device_node *np)
 820 {
 821         struct device_node *next, *dup, *child;
 822         unsigned long flags;
 823
 824         dup = of_find_node_by_path(np->full_name);
 825         if (dup) {
 826                 update_node_properties(np, dup);
 827                 return 0;
 828         }
 829
 830         child = np->child;
 831         np->child = NULL;
 832
 833         mutex_lock(&of_mutex);
 834         raw_spin_lock_irqsave(&devtree_lock, flags);
 835         np->sibling = np->parent->child;
 836         np->parent->child = np;
 837         of_node_clear_flag(np, OF_DETACHED);
 838         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 839
 840         __of_attach_node_sysfs(np);
 841         mutex_unlock(&of_mutex);
 842
 843         while (child) {
 844                 next = child->sibling;
 845                 attach_node_and_children(child);
 846                 child = next;
 847         }
 848
 849         return 0;
 850 }
 851
 852 /**
 853  *      selftest_data_add - Reads, copies data from
 854  *      linked tree and attaches it to the live tree
 855  */
 856 static int __init selftest_data_add(void)
 857 {
 858         void *selftest_data;
 859         struct device_node *selftest_data_node, *np;
 860         extern uint8_t __dtb_testcases_begin[];
 861         extern uint8_t __dtb_testcases_end[];
 862         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 863         int rc;
 864
 865         if (!size) {
 866                 pr_warn("%s: No testcase data to attach; not running tests\n",
 867                         __func__);
 868                 return -ENODATA;
 869         }
 870
 871         /* creating copy */
 872         selftest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 873
 874         if (!selftest_data) {
 875                 pr_warn("%s: Failed to allocate memory for selftest_data; "
 876                         "not running tests\n", __func__);
 877                 return -ENOMEM;
 878         }
 879         of_fdt_unflatten_tree(selftest_data, &selftest_data_node);
 880         if (!selftest_data_node) {
 881                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 882                 return -ENODATA;
 883         }
 884         of_node_set_flag(selftest_data_node, OF_DETACHED);
 885         rc = of_resolve_phandles(selftest_data_node);
 886         if (rc) {
 887                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 888                 return -EINVAL;
 889         }
 890
 891         if (!of_root) {
 892                 of_root = selftest_data_node;
 893                 for_each_of_allnodes(np)
 894                         __of_attach_node_sysfs(np);
 895                 of_aliases = of_find_node_by_path("/aliases");
 896                 of_chosen = of_find_node_by_path("/chosen");
 897                 return 0;
 898         }
 899
 900         /* attach the sub-tree to live tree */
 901         np = selftest_data_node->child;
 902         while (np) {
 903                 struct device_node *next = np->sibling;
 904                 np->parent = of_root;
 905                 attach_node_and_children(np);
 906                 np = next;
 907         }
 908         return 0;
 909 }
 910
 911 #ifdef CONFIG_OF_OVERLAY
 912
 913 static int selftest_probe(struct platform_device *pdev)
 914 {
 915         struct device *dev = &pdev->dev;
 916         struct device_node *np = dev->of_node;
 917
 918         if (np == NULL) {
 919                 dev_err(dev, "No OF data for device\n");
 920                 return -EINVAL;
 921
 922         }
 923
 924         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 925
 926         of_platform_populate(np, NULL, NULL, &pdev->dev);
 927
 928         return 0;
 929 }
 930
 931 static int selftest_remove(struct platform_device *pdev)
 932 {
 933         struct device *dev = &pdev->dev;
 934         struct device_node *np = dev->of_node;
 935
 936         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 937         return 0;
 938 }
 939
 940 static struct of_device_id selftest_match[] = {
 941         { .compatible = "selftest", },
 942         {},
 943 };
 944
 945 static struct platform_driver selftest_driver = {
 946         .probe                  = selftest_probe,
 947         .remove                 = selftest_remove,
 948         .driver = {
 949                 .name           = "selftest",
 950                 .owner          = THIS_MODULE,
 951                 .of_match_table = of_match_ptr(selftest_match),
 952         },
 953 };
 954
 955 /* get the platform device instantiated at the path */
 956 static struct platform_device *of_path_to_platform_device(const char *path)
 957 {
 958         struct device_node *np;
 959         struct platform_device *pdev;
 960
 961         np = of_find_node_by_path(path);
 962         if (np == NULL)
 963                 return NULL;
 964
 965         pdev = of_find_device_by_node(np);
 966         of_node_put(np);
 967
 968         return pdev;
 969 }
 970
 971 /* find out if a platform device exists at that path */
 972 static int of_path_platform_device_exists(const char *path)
 973 {
 974         struct platform_device *pdev;
 975
 976         pdev = of_path_to_platform_device(path);
 977         platform_device_put(pdev);
 978         return pdev != NULL;
 979 }
 980
 981 #if IS_BUILTIN(CONFIG_I2C)
 982
 983 /* get the i2c client device instantiated at the path */
 984 static struct i2c_client *of_path_to_i2c_client(const char *path)
 985 {
 986         struct device_node *np;
 987         struct i2c_client *client;
 988
 989         np = of_find_node_by_path(path);
 990         if (np == NULL)
 991                 return NULL;
 992
 993         client = of_find_i2c_device_by_node(np);
 994         of_node_put(np);
 995
 996         return client;
 997 }
 998
 999 /* find out if a i2c client device exists at that path */
1000 static int of_path_i2c_client_exists(const char *path)
1001 {
1002         struct i2c_client *client;
1003
1004         client = of_path_to_i2c_client(path);
1005         if (client)
1006                 put_device(&client->dev);
1007         return client != NULL;
1008 }
1009 #else
1010 static int of_path_i2c_client_exists(const char *path)
1011 {
1012         return 0;
1013 }
1014 #endif
1015
1016 enum overlay_type {
1017         PDEV_OVERLAY,
1018         I2C_OVERLAY
1019 };
1020
1021 static int of_path_device_type_exists(const char *path,
1022                 enum overlay_type ovtype)
1023 {
1024         switch (ovtype) {
1025         case PDEV_OVERLAY:
1026                 return of_path_platform_device_exists(path);
1027         case I2C_OVERLAY:
1028                 return of_path_i2c_client_exists(path);
1029         }
1030         return 0;
1031 }
1032
1033 static const char *selftest_path(int nr, enum overlay_type ovtype)
1034 {
1035         const char *base;
1036         static char buf[256];
1037
1038         switch (ovtype) {
1039         case PDEV_OVERLAY:
1040                 base = "/testcase-data/overlay-node/test-bus";
1041                 break;
1042         case I2C_OVERLAY:
1043                 base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1044                 break;
1045         default:
1046                 buf[0] = '\0';
1047                 return buf;
1048         }
1049         snprintf(buf, sizeof(buf) - 1, "%s/test-selftest%d", base, nr);
1050         buf[sizeof(buf) - 1] = '\0';
1051         return buf;
1052 }
1053
1054 static int of_selftest_device_exists(int selftest_nr, enum overlay_type ovtype)
1055 {
1056         const char *path;
1057
1058         path = selftest_path(selftest_nr, ovtype);
1059
1060         switch (ovtype) {
1061         case PDEV_OVERLAY:
1062                 return of_path_platform_device_exists(path);
1063         case I2C_OVERLAY:
1064                 return of_path_i2c_client_exists(path);
1065         }
1066         return 0;
1067 }
1068
1069 static const char *overlay_path(int nr)
1070 {
1071         static char buf[256];
1072
1073         snprintf(buf, sizeof(buf) - 1,
1074                 "/testcase-data/overlay%d", nr);
1075         buf[sizeof(buf) - 1] = '\0';
1076
1077         return buf;
1078 }
1079
1080 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1081
1082 static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,
1083                 int *overlay_id)
1084 {
1085         struct device_node *np = NULL;
1086         int ret, id = -1;
1087
1088         np = of_find_node_by_path(overlay_path(overlay_nr));
1089         if (np == NULL) {
1090                 selftest(0, "could not find overlay node @\"%s\"\n",
1091                                 overlay_path(overlay_nr));
1092                 ret = -EINVAL;
1093                 goto out;
1094         }
1095
1096         ret = of_overlay_create(np);
1097         if (ret < 0) {
1098                 selftest(0, "could not create overlay from \"%s\"\n",
1099                                 overlay_path(overlay_nr));
1100                 goto out;
1101         }
1102         id = ret;
1103
1104         ret = 0;
1105
1106 out:
1107         of_node_put(np);
1108
1109         if (overlay_id)
1110                 *overlay_id = id;
1111
1112         return ret;
1113 }
1114
1115 /* apply an overlay while checking before and after states */
1116 static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
1117                 int before, int after, enum overlay_type ovtype)
1118 {
1119         int ret;
1120
1121         /* selftest device must not be in before state */
1122         if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
1123                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1124                                 overlay_path(overlay_nr),
1125                                 selftest_path(selftest_nr, ovtype),
1126                                 !before ? "enabled" : "disabled");
1127                 return -EINVAL;
1128         }
1129
1130         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, NULL);
1131         if (ret != 0) {
1132                 /* of_selftest_apply_overlay already called selftest() */
1133                 return ret;
1134         }
1135
1136         /* selftest device must be to set to after state */
1137         if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
1138                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1139                                 overlay_path(overlay_nr),
1140                                 selftest_path(selftest_nr, ovtype),
1141                                 !after ? "enabled" : "disabled");
1142                 return -EINVAL;
1143         }
1144
1145         return 0;
1146 }
1147
1148 /* apply an overlay and then revert it while checking before, after states */
1149 static int of_selftest_apply_revert_overlay_check(int overlay_nr,
1150                 int selftest_nr, int before, int after,
1151                 enum overlay_type ovtype)
1152 {
1153         int ret, ov_id;
1154
1155         /* selftest device must be in before state */
1156         if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
1157                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1158                                 overlay_path(overlay_nr),
1159                                 selftest_path(selftest_nr, ovtype),
1160                                 !before ? "enabled" : "disabled");
1161                 return -EINVAL;
1162         }
1163
1164         /* apply the overlay */
1165         ret = of_selftest_apply_overlay(overlay_nr, selftest_nr, &ov_id);
1166         if (ret != 0) {
1167                 /* of_selftest_apply_overlay already called selftest() */
1168                 return ret;
1169         }
1170
1171         /* selftest device must be in after state */
1172         if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
1173                 selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1174                                 overlay_path(overlay_nr),
1175                                 selftest_path(selftest_nr, ovtype),
1176                                 !after ? "enabled" : "disabled");
1177                 return -EINVAL;
1178         }
1179
1180         ret = of_overlay_destroy(ov_id);
1181         if (ret != 0) {
1182                 selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1183                                 overlay_path(overlay_nr),
1184                                 selftest_path(selftest_nr, ovtype));
1185                 return ret;
1186         }
1187
1188         /* selftest device must be again in before state */
1189         if (of_selftest_device_exists(selftest_nr, PDEV_OVERLAY) != before) {
1190                 selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1191                                 overlay_path(overlay_nr),
1192                                 selftest_path(selftest_nr, ovtype),
1193                                 !before ? "enabled" : "disabled");
1194                 return -EINVAL;
1195         }
1196
1197         return 0;
1198 }
1199
1200 /* test activation of device */
1201 static void of_selftest_overlay_0(void)
1202 {
1203         int ret;
1204
1205         /* device should enable */
1206         ret = of_selftest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
1207         if (ret != 0)
1208                 return;
1209
1210         selftest(1, "overlay test %d passed\n", 0);
1211 }
1212
1213 /* test deactivation of device */
1214 static void of_selftest_overlay_1(void)
1215 {
1216         int ret;
1217
1218         /* device should disable */
1219         ret = of_selftest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
1220         if (ret != 0)
1221                 return;
1222
1223         selftest(1, "overlay test %d passed\n", 1);
1224 }
1225
1226 /* test activation of device */
1227 static void of_selftest_overlay_2(void)
1228 {
1229         int ret;
1230
1231         /* device should enable */
1232         ret = of_selftest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
1233         if (ret != 0)
1234                 return;
1235
1236         selftest(1, "overlay test %d passed\n", 2);
1237 }
1238
1239 /* test deactivation of device */
1240 static void of_selftest_overlay_3(void)
1241 {
1242         int ret;
1243
1244         /* device should disable */
1245         ret = of_selftest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
1246         if (ret != 0)
1247                 return;
1248
1249         selftest(1, "overlay test %d passed\n", 3);
1250 }
1251
1252 /* test activation of a full device node */
1253 static void of_selftest_overlay_4(void)
1254 {
1255         int ret;
1256
1257         /* device should disable */
1258         ret = of_selftest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
1259         if (ret != 0)
1260                 return;
1261
1262         selftest(1, "overlay test %d passed\n", 4);
1263 }
1264
1265 /* test overlay apply/revert sequence */
1266 static void of_selftest_overlay_5(void)
1267 {
1268         int ret;
1269
1270         /* device should disable */
1271         ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
1272         if (ret != 0)
1273                 return;
1274
1275         selftest(1, "overlay test %d passed\n", 5);
1276 }
1277
1278 /* test overlay application in sequence */
1279 static void of_selftest_overlay_6(void)
1280 {
1281         struct device_node *np;
1282         int ret, i, ov_id[2];
1283         int overlay_nr = 6, selftest_nr = 6;
1284         int before = 0, after = 1;
1285
1286         /* selftest device must be in before state */
1287         for (i = 0; i < 2; i++) {
1288                 if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
1289                                 != before) {
1290                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1291                                         overlay_path(overlay_nr + i),
1292                                         selftest_path(selftest_nr + i,
1293                                                 PDEV_OVERLAY),
1294                                         !before ? "enabled" : "disabled");
1295                         return;
1296                 }
1297         }
1298
1299         /* apply the overlays */
1300         for (i = 0; i < 2; i++) {
1301
1302                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1303                 if (np == NULL) {
1304                         selftest(0, "could not find overlay node @\"%s\"\n",
1305                                         overlay_path(overlay_nr + i));
1306                         return;
1307                 }
1308
1309                 ret = of_overlay_create(np);
1310                 if (ret < 0)  {
1311                         selftest(0, "could not create overlay from \"%s\"\n",
1312                                         overlay_path(overlay_nr + i));
1313                         return;
1314                 }
1315                 ov_id[i] = ret;
1316         }
1317
1318         for (i = 0; i < 2; i++) {
1319                 /* selftest device must be in after state */
1320                 if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
1321                                 != after) {
1322                         selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1323                                         overlay_path(overlay_nr + i),
1324                                         selftest_path(selftest_nr + i,
1325                                                 PDEV_OVERLAY),
1326                                         !after ? "enabled" : "disabled");
1327                         return;
1328                 }
1329         }
1330
1331         for (i = 1; i >= 0; i--) {
1332                 ret = of_overlay_destroy(ov_id[i]);
1333                 if (ret != 0) {
1334                         selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1335                                         overlay_path(overlay_nr + i),
1336                                         selftest_path(selftest_nr + i,
1337                                                 PDEV_OVERLAY));
1338                         return;
1339                 }
1340         }
1341
1342         for (i = 0; i < 2; i++) {
1343                 /* selftest device must be again in before state */
1344                 if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
1345                                 != before) {
1346                         selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1347                                         overlay_path(overlay_nr + i),
1348                                         selftest_path(selftest_nr + i,
1349                                                 PDEV_OVERLAY),
1350                                         !before ? "enabled" : "disabled");
1351                         return;
1352                 }
1353         }
1354
1355         selftest(1, "overlay test %d passed\n", 6);
1356 }
1357
1358 /* test overlay application in sequence */
1359 static void of_selftest_overlay_8(void)
1360 {
1361         struct device_node *np;
1362         int ret, i, ov_id[2];
1363         int overlay_nr = 8, selftest_nr = 8;
1364
1365         /* we don't care about device state in this test */
1366
1367         /* apply the overlays */
1368         for (i = 0; i < 2; i++) {
1369
1370                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1371                 if (np == NULL) {
1372                         selftest(0, "could not find overlay node @\"%s\"\n",
1373                                         overlay_path(overlay_nr + i));
1374                         return;
1375                 }
1376
1377                 ret = of_overlay_create(np);
1378                 if (ret < 0)  {
1379                         selftest(0, "could not create overlay from \"%s\"\n",
1380                                         overlay_path(overlay_nr + i));
1381                         return;
1382                 }
1383                 ov_id[i] = ret;
1384         }
1385
1386         /* now try to remove first overlay (it should fail) */
1387         ret = of_overlay_destroy(ov_id[0]);
1388         if (ret == 0) {
1389                 selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1390                                 overlay_path(overlay_nr + 0),
1391                                 selftest_path(selftest_nr,
1392                                         PDEV_OVERLAY));
1393                 return;
1394         }
1395
1396         /* removing them in order should work */
1397         for (i = 1; i >= 0; i--) {
1398                 ret = of_overlay_destroy(ov_id[i]);
1399                 if (ret != 0) {
1400                         selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1401                                         overlay_path(overlay_nr + i),
1402                                         selftest_path(selftest_nr,
1403                                                 PDEV_OVERLAY));
1404                         return;
1405                 }
1406         }
1407
1408         selftest(1, "overlay test %d passed\n", 8);
1409 }
1410
1411 /* test insertion of a bus with parent devices */
1412 static void of_selftest_overlay_10(void)
1413 {
1414         int ret;
1415         char *child_path;
1416
1417         /* device should disable */
1418         ret = of_selftest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
1419         if (selftest(ret == 0,
1420                         "overlay test %d failed; overlay application\n", 10))
1421                 return;
1422
1423         child_path = kasprintf(GFP_KERNEL, "%s/test-selftest101",
1424                         selftest_path(10, PDEV_OVERLAY));
1425         if (selftest(child_path, "overlay test %d failed; kasprintf\n", 10))
1426                 return;
1427
1428         ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
1429         kfree(child_path);
1430         if (selftest(ret, "overlay test %d failed; no child device\n", 10))
1431                 return;
1432 }
1433
1434 /* test insertion of a bus with parent devices (and revert) */
1435 static void of_selftest_overlay_11(void)
1436 {
1437         int ret;
1438
1439         /* device should disable */
1440         ret = of_selftest_apply_revert_overlay_check(11, 11, 0, 1,
1441                         PDEV_OVERLAY);
1442         if (selftest(ret == 0,
1443                         "overlay test %d failed; overlay application\n", 11))
1444                 return;
1445 }
1446
1447 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
1448
1449 struct selftest_i2c_bus_data {
1450         struct platform_device  *pdev;
1451         struct i2c_adapter      adap;
1452 };
1453
1454 static int selftest_i2c_master_xfer(struct i2c_adapter *adap,
1455                 struct i2c_msg *msgs, int num)
1456 {
1457         struct selftest_i2c_bus_data *std = i2c_get_adapdata(adap);
1458
1459         (void)std;
1460
1461         return num;
1462 }
1463
1464 static u32 selftest_i2c_functionality(struct i2c_adapter *adap)
1465 {
1466         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1467 }
1468
1469 static const struct i2c_algorithm selftest_i2c_algo = {
1470         .master_xfer    = selftest_i2c_master_xfer,
1471         .functionality  = selftest_i2c_functionality,
1472 };
1473
1474 static int selftest_i2c_bus_probe(struct platform_device *pdev)
1475 {
1476         struct device *dev = &pdev->dev;
1477         struct device_node *np = dev->of_node;
1478         struct selftest_i2c_bus_data *std;
1479         struct i2c_adapter *adap;
1480         int ret;
1481
1482         if (np == NULL) {
1483                 dev_err(dev, "No OF data for device\n");
1484                 return -EINVAL;
1485
1486         }
1487
1488         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1489
1490         std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
1491         if (!std) {
1492                 dev_err(dev, "Failed to allocate selftest i2c data\n");
1493                 return -ENOMEM;
1494         }
1495
1496         /* link them together */
1497         std->pdev = pdev;
1498         platform_set_drvdata(pdev, std);
1499
1500         adap = &std->adap;
1501         i2c_set_adapdata(adap, std);
1502         adap->nr = -1;
1503         strlcpy(adap->name, pdev->name, sizeof(adap->name));
1504         adap->class = I2C_CLASS_DEPRECATED;
1505         adap->algo = &selftest_i2c_algo;
1506         adap->dev.parent = dev;
1507         adap->dev.of_node = dev->of_node;
1508         adap->timeout = 5 * HZ;
1509         adap->retries = 3;
1510
1511         ret = i2c_add_numbered_adapter(adap);
1512         if (ret != 0) {
1513                 dev_err(dev, "Failed to add I2C adapter\n");
1514                 return ret;
1515         }
1516
1517         return 0;
1518 }
1519
1520 static int selftest_i2c_bus_remove(struct platform_device *pdev)
1521 {
1522         struct device *dev = &pdev->dev;
1523         struct device_node *np = dev->of_node;
1524         struct selftest_i2c_bus_data *std = platform_get_drvdata(pdev);
1525
1526         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1527         i2c_del_adapter(&std->adap);
1528
1529         return 0;
1530 }
1531
1532 static struct of_device_id selftest_i2c_bus_match[] = {
1533         { .compatible = "selftest-i2c-bus", },
1534         {},
1535 };
1536
1537 static struct platform_driver selftest_i2c_bus_driver = {
1538         .probe                  = selftest_i2c_bus_probe,
1539         .remove                 = selftest_i2c_bus_remove,
1540         .driver = {
1541                 .name           = "selftest-i2c-bus",
1542                 .of_match_table = of_match_ptr(selftest_i2c_bus_match),
1543         },
1544 };
1545
1546 static int selftest_i2c_dev_probe(struct i2c_client *client,
1547                 const struct i2c_device_id *id)
1548 {
1549         struct device *dev = &client->dev;
1550         struct device_node *np = client->dev.of_node;
1551
1552         if (!np) {
1553                 dev_err(dev, "No OF node\n");
1554                 return -EINVAL;
1555         }
1556
1557         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1558
1559         return 0;
1560 };
1561
1562 static int selftest_i2c_dev_remove(struct i2c_client *client)
1563 {
1564         struct device *dev = &client->dev;
1565         struct device_node *np = client->dev.of_node;
1566
1567         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1568         return 0;
1569 }
1570
1571 static const struct i2c_device_id selftest_i2c_dev_id[] = {
1572         { .name = "selftest-i2c-dev" },
1573         { }
1574 };
1575
1576 static struct i2c_driver selftest_i2c_dev_driver = {
1577         .driver = {
1578                 .name = "selftest-i2c-dev",
1579                 .owner = THIS_MODULE,
1580         },
1581         .probe = selftest_i2c_dev_probe,
1582         .remove = selftest_i2c_dev_remove,
1583         .id_table = selftest_i2c_dev_id,
1584 };
1585
1586 #if IS_BUILTIN(CONFIG_I2C_MUX)
1587
1588 struct selftest_i2c_mux_data {
1589         int nchans;
1590         struct i2c_adapter *adap[];
1591 };
1592
1593 static int selftest_i2c_mux_select_chan(struct i2c_adapter *adap,
1594                                void *client, u32 chan)
1595 {
1596         return 0;
1597 }
1598
1599 static int selftest_i2c_mux_probe(struct i2c_client *client,
1600                 const struct i2c_device_id *id)
1601 {
1602         int ret, i, nchans, size;
1603         struct device *dev = &client->dev;
1604         struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
1605         struct device_node *np = client->dev.of_node, *child;
1606         struct selftest_i2c_mux_data *stm;
1607         u32 reg, max_reg;
1608
1609         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1610
1611         if (!np) {
1612                 dev_err(dev, "No OF node\n");
1613                 return -EINVAL;
1614         }
1615
1616         max_reg = (u32)-1;
1617         for_each_child_of_node(np, child) {
1618                 ret = of_property_read_u32(child, "reg", &reg);
1619                 if (ret)
1620                         continue;
1621                 if (max_reg == (u32)-1 || reg > max_reg)
1622                         max_reg = reg;
1623         }
1624         nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
1625         if (nchans == 0) {
1626                 dev_err(dev, "No channels\n");
1627                 return -EINVAL;
1628         }
1629
1630         size = offsetof(struct selftest_i2c_mux_data, adap[nchans]);
1631         stm = devm_kzalloc(dev, size, GFP_KERNEL);
1632         if (!stm) {
1633                 dev_err(dev, "Out of memory\n");
1634                 return -ENOMEM;
1635         }
1636         stm->nchans = nchans;
1637         for (i = 0; i < nchans; i++) {
1638                 stm->adap[i] = i2c_add_mux_adapter(adap, dev, client,
1639                                 0, i, 0, selftest_i2c_mux_select_chan, NULL);
1640                 if (!stm->adap[i]) {
1641                         dev_err(dev, "Failed to register mux #%d\n", i);
1642                         for (i--; i >= 0; i--)
1643                                 i2c_del_mux_adapter(stm->adap[i]);
1644                         return -ENODEV;
1645                 }
1646         }
1647
1648         i2c_set_clientdata(client, stm);
1649
1650         return 0;
1651 };
1652
1653 static int selftest_i2c_mux_remove(struct i2c_client *client)
1654 {
1655         struct device *dev = &client->dev;
1656         struct device_node *np = client->dev.of_node;
1657         struct selftest_i2c_mux_data *stm = i2c_get_clientdata(client);
1658         int i;
1659
1660         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1661         for (i = stm->nchans - 1; i >= 0; i--)
1662                 i2c_del_mux_adapter(stm->adap[i]);
1663         return 0;
1664 }
1665
1666 static const struct i2c_device_id selftest_i2c_mux_id[] = {
1667         { .name = "selftest-i2c-mux" },
1668         { }
1669 };
1670
1671 static struct i2c_driver selftest_i2c_mux_driver = {
1672         .driver = {
1673                 .name = "selftest-i2c-mux",
1674                 .owner = THIS_MODULE,
1675         },
1676         .probe = selftest_i2c_mux_probe,
1677         .remove = selftest_i2c_mux_remove,
1678         .id_table = selftest_i2c_mux_id,
1679 };
1680
1681 #endif
1682
1683 static int of_selftest_overlay_i2c_init(void)
1684 {
1685         int ret;
1686
1687         ret = i2c_add_driver(&selftest_i2c_dev_driver);
1688         if (selftest(ret == 0,
1689                         "could not register selftest i2c device driver\n"))
1690                 return ret;
1691
1692         ret = platform_driver_register(&selftest_i2c_bus_driver);
1693         if (selftest(ret == 0,
1694                         "could not register selftest i2c bus driver\n"))
1695                 return ret;
1696
1697 #if IS_BUILTIN(CONFIG_I2C_MUX)
1698         ret = i2c_add_driver(&selftest_i2c_mux_driver);
1699         if (selftest(ret == 0,
1700                         "could not register selftest i2c mux driver\n"))
1701                 return ret;
1702 #endif
1703
1704         return 0;
1705 }
1706
1707 static void of_selftest_overlay_i2c_cleanup(void)
1708 {
1709 #if IS_BUILTIN(CONFIG_I2C_MUX)
1710         i2c_del_driver(&selftest_i2c_mux_driver);
1711 #endif
1712         platform_driver_unregister(&selftest_i2c_bus_driver);
1713         i2c_del_driver(&selftest_i2c_dev_driver);
1714 }
1715
1716 static void of_selftest_overlay_i2c_12(void)
1717 {
1718         int ret;
1719
1720         /* device should enable */
1721         ret = of_selftest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
1722         if (ret != 0)
1723                 return;
1724
1725         selftest(1, "overlay test %d passed\n", 12);
1726 }
1727
1728 /* test deactivation of device */
1729 static void of_selftest_overlay_i2c_13(void)
1730 {
1731         int ret;
1732
1733         /* device should disable */
1734         ret = of_selftest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
1735         if (ret != 0)
1736                 return;
1737
1738         selftest(1, "overlay test %d passed\n", 13);
1739 }
1740
1741 /* just check for i2c mux existence */
1742 static void of_selftest_overlay_i2c_14(void)
1743 {
1744 }
1745
1746 static void of_selftest_overlay_i2c_15(void)
1747 {
1748         int ret;
1749
1750         /* device should enable */
1751         ret = of_selftest_apply_overlay_check(16, 15, 0, 1, I2C_OVERLAY);
1752         if (ret != 0)
1753                 return;
1754
1755         selftest(1, "overlay test %d passed\n", 15);
1756 }
1757
1758 #else
1759
1760 static inline void of_selftest_overlay_i2c_14(void) { }
1761 static inline void of_selftest_overlay_i2c_15(void) { }
1762
1763 #endif
1764
1765 static void __init of_selftest_overlay(void)
1766 {
1767         struct device_node *bus_np = NULL;
1768         int ret;
1769
1770         ret = platform_driver_register(&selftest_driver);
1771         if (ret != 0) {
1772                 selftest(0, "could not register selftest driver\n");
1773                 goto out;
1774         }
1775
1776         bus_np = of_find_node_by_path(bus_path);
1777         if (bus_np == NULL) {
1778                 selftest(0, "could not find bus_path \"%s\"\n", bus_path);
1779                 goto out;
1780         }
1781
1782         ret = of_platform_populate(bus_np, of_default_bus_match_table,
1783                         NULL, NULL);
1784         if (ret != 0) {
1785                 selftest(0, "could not populate bus @ \"%s\"\n", bus_path);
1786                 goto out;
1787         }
1788
1789         if (!of_selftest_device_exists(100, PDEV_OVERLAY)) {
1790                 selftest(0, "could not find selftest0 @ \"%s\"\n",
1791                                 selftest_path(100, PDEV_OVERLAY));
1792                 goto out;
1793         }
1794
1795         if (of_selftest_device_exists(101, PDEV_OVERLAY)) {
1796                 selftest(0, "selftest1 @ \"%s\" should not exist\n",
1797                                 selftest_path(101, PDEV_OVERLAY));
1798                 goto out;
1799         }
1800
1801         selftest(1, "basic infrastructure of overlays passed");
1802
1803         /* tests in sequence */
1804         of_selftest_overlay_0();
1805         of_selftest_overlay_1();
1806         of_selftest_overlay_2();
1807         of_selftest_overlay_3();
1808         of_selftest_overlay_4();
1809         of_selftest_overlay_5();
1810         of_selftest_overlay_6();
1811         of_selftest_overlay_8();
1812
1813         of_selftest_overlay_10();
1814         of_selftest_overlay_11();
1815
1816 #if IS_BUILTIN(CONFIG_I2C)
1817         if (selftest(of_selftest_overlay_i2c_init() == 0, "i2c init failed\n"))
1818                 goto out;
1819
1820         of_selftest_overlay_i2c_12();
1821         of_selftest_overlay_i2c_13();
1822         of_selftest_overlay_i2c_14();
1823         of_selftest_overlay_i2c_15();
1824
1825         of_selftest_overlay_i2c_cleanup();
1826 #endif
1827
1828 out:
1829         of_node_put(bus_np);
1830 }
1831
1832 #else
1833 static inline void __init of_selftest_overlay(void) { }
1834 #endif
1835
1836 static int __init of_selftest(void)
1837 {
1838         struct device_node *np;
1839         int res;
1840
1841         /* adding data for selftest */
1842         res = selftest_data_add();
1843         if (res)
1844                 return res;
1845         if (!of_aliases)
1846                 of_aliases = of_find_node_by_path("/aliases");
1847
1848         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
1849         if (!np) {
1850                 pr_info("No testcase data in device tree; not running tests\n");
1851                 return 0;
1852         }
1853         of_node_put(np);
1854
1855         pr_info("start of selftest - you will see error messages\n");
1856         of_selftest_check_tree_linkage();
1857         of_selftest_check_phandles();
1858         of_selftest_find_node_by_name();
1859         of_selftest_dynamic();
1860         of_selftest_parse_phandle_with_args();
1861         of_selftest_property_string();
1862         of_selftest_property_copy();
1863         of_selftest_changeset();
1864         of_selftest_parse_interrupts();
1865         of_selftest_parse_interrupts_extended();
1866         of_selftest_match_node();
1867         of_selftest_platform_populate();
1868         of_selftest_overlay();
1869
1870         /* Double check linkage after removing testcase data */
1871         of_selftest_check_tree_linkage();
1872
1873         pr_info("end of selftest - %i passed, %i failed\n",
1874                 selftest_results.passed, selftest_results.failed);
1875
1876         return 0;
1877 }
1878 late_initcall(of_selftest);