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_irq.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/list.h>
  15 #include <linux/mutex.h>
  16 #include <linux/slab.h>
  17 #include <linux/device.h>
  18
  19 static struct selftest_results {
  20         int passed;
  21         int failed;
  22 } selftest_results;
  23
  24 #define selftest(result, fmt, ...) { \
  25         if (!(result)) { \
  26                 selftest_results.failed++; \
  27                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  28         } else { \
  29                 selftest_results.passed++; \
  30                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  31         } \
  32 }
  33
  34 static void __init of_selftest_find_node_by_name(void)
  35 {
  36         struct device_node *np;
  37
  38         np = of_find_node_by_path("/testcase-data");
  39         selftest(np && !strcmp("/testcase-data", np->full_name),
  40                 "find /testcase-data failed\n");
  41         of_node_put(np);
  42
  43         /* Test if trailing '/' works */
  44         np = of_find_node_by_path("/testcase-data/");
  45         selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
  46
  47         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  48         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  49                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  50         of_node_put(np);
  51
  52         np = of_find_node_by_path("testcase-alias");
  53         selftest(np && !strcmp("/testcase-data", np->full_name),
  54                 "find testcase-alias failed\n");
  55         of_node_put(np);
  56
  57         /* Test if trailing '/' works on aliases */
  58         np = of_find_node_by_path("testcase-alias/");
  59         selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
  60
  61         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  62         selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  63                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  64         of_node_put(np);
  65
  66         np = of_find_node_by_path("/testcase-data/missing-path");
  67         selftest(!np, "non-existent path returned node %s\n", np->full_name);
  68         of_node_put(np);
  69
  70         np = of_find_node_by_path("missing-alias");
  71         selftest(!np, "non-existent alias returned node %s\n", np->full_name);
  72         of_node_put(np);
  73
  74         np = of_find_node_by_path("testcase-alias/missing-path");
  75         selftest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  76         of_node_put(np);
  77 }
  78
  79 static void __init of_selftest_dynamic(void)
  80 {
  81         struct device_node *np;
  82         struct property *prop;
  83
  84         np = of_find_node_by_path("/testcase-data");
  85         if (!np) {
  86                 pr_err("missing testcase data\n");
  87                 return;
  88         }
  89
  90         /* Array of 4 properties for the purpose of testing */
  91         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
  92         if (!prop) {
  93                 selftest(0, "kzalloc() failed\n");
  94                 return;
  95         }
  96
  97         /* Add a new property - should pass*/
  98         prop->name = "new-property";
  99         prop->value = "new-property-data";
 100         prop->length = strlen(prop->value);
 101         selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 102
 103         /* Try to add an existing property - should fail */
 104         prop++;
 105         prop->name = "new-property";
 106         prop->value = "new-property-data-should-fail";
 107         prop->length = strlen(prop->value);
 108         selftest(of_add_property(np, prop) != 0,
 109                  "Adding an existing property should have failed\n");
 110
 111         /* Try to modify an existing property - should pass */
 112         prop->value = "modify-property-data-should-pass";
 113         prop->length = strlen(prop->value);
 114         selftest(of_update_property(np, prop) == 0,
 115                  "Updating an existing property should have passed\n");
 116
 117         /* Try to modify non-existent property - should pass*/
 118         prop++;
 119         prop->name = "modify-property";
 120         prop->value = "modify-missing-property-data-should-pass";
 121         prop->length = strlen(prop->value);
 122         selftest(of_update_property(np, prop) == 0,
 123                  "Updating a missing property should have passed\n");
 124
 125         /* Remove property - should pass */
 126         selftest(of_remove_property(np, prop) == 0,
 127                  "Removing a property should have passed\n");
 128
 129         /* Adding very large property - should pass */
 130         prop++;
 131         prop->name = "large-property-PAGE_SIZEx8";
 132         prop->length = PAGE_SIZE * 8;
 133         prop->value = kzalloc(prop->length, GFP_KERNEL);
 134         selftest(prop->value != NULL, "Unable to allocate large buffer\n");
 135         if (prop->value)
 136                 selftest(of_add_property(np, prop) == 0,
 137                          "Adding a large property should have passed\n");
 138 }
 139
 140 static void __init of_selftest_parse_phandle_with_args(void)
 141 {
 142         struct device_node *np;
 143         struct of_phandle_args args;
 144         int i, rc;
 145
 146         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 147         if (!np) {
 148                 pr_err("missing testcase data\n");
 149                 return;
 150         }
 151
 152         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 153         selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 154
 155         for (i = 0; i < 8; i++) {
 156                 bool passed = true;
 157                 rc = of_parse_phandle_with_args(np, "phandle-list",
 158                                                 "#phandle-cells", i, &args);
 159
 160                 /* Test the values from tests-phandle.dtsi */
 161                 switch (i) {
 162                 case 0:
 163                         passed &= !rc;
 164                         passed &= (args.args_count == 1);
 165                         passed &= (args.args[0] == (i + 1));
 166                         break;
 167                 case 1:
 168                         passed &= !rc;
 169                         passed &= (args.args_count == 2);
 170                         passed &= (args.args[0] == (i + 1));
 171                         passed &= (args.args[1] == 0);
 172                         break;
 173                 case 2:
 174                         passed &= (rc == -ENOENT);
 175                         break;
 176                 case 3:
 177                         passed &= !rc;
 178                         passed &= (args.args_count == 3);
 179                         passed &= (args.args[0] == (i + 1));
 180                         passed &= (args.args[1] == 4);
 181                         passed &= (args.args[2] == 3);
 182                         break;
 183                 case 4:
 184                         passed &= !rc;
 185                         passed &= (args.args_count == 2);
 186                         passed &= (args.args[0] == (i + 1));
 187                         passed &= (args.args[1] == 100);
 188                         break;
 189                 case 5:
 190                         passed &= !rc;
 191                         passed &= (args.args_count == 0);
 192                         break;
 193                 case 6:
 194                         passed &= !rc;
 195                         passed &= (args.args_count == 1);
 196                         passed &= (args.args[0] == (i + 1));
 197                         break;
 198                 case 7:
 199                         passed &= (rc == -ENOENT);
 200                         break;
 201                 default:
 202                         passed = false;
 203                 }
 204
 205                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 206                          i, args.np->full_name, rc);
 207         }
 208
 209         /* Check for missing list property */
 210         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 211                                         "#phandle-cells", 0, &args);
 212         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 213         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 214                                         "#phandle-cells");
 215         selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 216
 217         /* Check for missing cells property */
 218         rc = of_parse_phandle_with_args(np, "phandle-list",
 219                                         "#phandle-cells-missing", 0, &args);
 220         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 221         rc = of_count_phandle_with_args(np, "phandle-list",
 222                                         "#phandle-cells-missing");
 223         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 224
 225         /* Check for bad phandle in list */
 226         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 227                                         "#phandle-cells", 0, &args);
 228         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 229         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 230                                         "#phandle-cells");
 231         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 232
 233         /* Check for incorrectly formed argument list */
 234         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 235                                         "#phandle-cells", 1, &args);
 236         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 237         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 238                                         "#phandle-cells");
 239         selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 240 }
 241
 242 static void __init of_selftest_property_match_string(void)
 243 {
 244         struct device_node *np;
 245         int rc;
 246
 247         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 248         if (!np) {
 249                 pr_err("No testcase data in device tree\n");
 250                 return;
 251         }
 252
 253         rc = of_property_match_string(np, "phandle-list-names", "first");
 254         selftest(rc == 0, "first expected:0 got:%i\n", rc);
 255         rc = of_property_match_string(np, "phandle-list-names", "second");
 256         selftest(rc == 1, "second expected:0 got:%i\n", rc);
 257         rc = of_property_match_string(np, "phandle-list-names", "third");
 258         selftest(rc == 2, "third expected:0 got:%i\n", rc);
 259         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 260         selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
 261         rc = of_property_match_string(np, "missing-property", "blah");
 262         selftest(rc == -EINVAL, "missing property; rc=%i", rc);
 263         rc = of_property_match_string(np, "empty-property", "blah");
 264         selftest(rc == -ENODATA, "empty property; rc=%i", rc);
 265         rc = of_property_match_string(np, "unterminated-string", "blah");
 266         selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
 267 }
 268
 269 static void __init of_selftest_parse_interrupts(void)
 270 {
 271         struct device_node *np;
 272         struct of_phandle_args args;
 273         int i, rc;
 274
 275         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 276         if (!np) {
 277                 pr_err("missing testcase data\n");
 278                 return;
 279         }
 280
 281         for (i = 0; i < 4; i++) {
 282                 bool passed = true;
 283                 args.args_count = 0;
 284                 rc = of_irq_parse_one(np, i, &args);
 285
 286                 passed &= !rc;
 287                 passed &= (args.args_count == 1);
 288                 passed &= (args.args[0] == (i + 1));
 289
 290                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 291                          i, args.np->full_name, rc);
 292         }
 293         of_node_put(np);
 294
 295         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 296         if (!np) {
 297                 pr_err("missing testcase data\n");
 298                 return;
 299         }
 300
 301         for (i = 0; i < 4; i++) {
 302                 bool passed = true;
 303                 args.args_count = 0;
 304                 rc = of_irq_parse_one(np, i, &args);
 305
 306                 /* Test the values from tests-phandle.dtsi */
 307                 switch (i) {
 308                 case 0:
 309                         passed &= !rc;
 310                         passed &= (args.args_count == 1);
 311                         passed &= (args.args[0] == 9);
 312                         break;
 313                 case 1:
 314                         passed &= !rc;
 315                         passed &= (args.args_count == 3);
 316                         passed &= (args.args[0] == 10);
 317                         passed &= (args.args[1] == 11);
 318                         passed &= (args.args[2] == 12);
 319                         break;
 320                 case 2:
 321                         passed &= !rc;
 322                         passed &= (args.args_count == 2);
 323                         passed &= (args.args[0] == 13);
 324                         passed &= (args.args[1] == 14);
 325                         break;
 326                 case 3:
 327                         passed &= !rc;
 328                         passed &= (args.args_count == 2);
 329                         passed &= (args.args[0] == 15);
 330                         passed &= (args.args[1] == 16);
 331                         break;
 332                 default:
 333                         passed = false;
 334                 }
 335                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 336                          i, args.np->full_name, rc);
 337         }
 338         of_node_put(np);
 339 }
 340
 341 static void __init of_selftest_parse_interrupts_extended(void)
 342 {
 343         struct device_node *np;
 344         struct of_phandle_args args;
 345         int i, rc;
 346
 347         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 348         if (!np) {
 349                 pr_err("missing testcase data\n");
 350                 return;
 351         }
 352
 353         for (i = 0; i < 7; i++) {
 354                 bool passed = true;
 355                 rc = of_irq_parse_one(np, i, &args);
 356
 357                 /* Test the values from tests-phandle.dtsi */
 358                 switch (i) {
 359                 case 0:
 360                         passed &= !rc;
 361                         passed &= (args.args_count == 1);
 362                         passed &= (args.args[0] == 1);
 363                         break;
 364                 case 1:
 365                         passed &= !rc;
 366                         passed &= (args.args_count == 3);
 367                         passed &= (args.args[0] == 2);
 368                         passed &= (args.args[1] == 3);
 369                         passed &= (args.args[2] == 4);
 370                         break;
 371                 case 2:
 372                         passed &= !rc;
 373                         passed &= (args.args_count == 2);
 374                         passed &= (args.args[0] == 5);
 375                         passed &= (args.args[1] == 6);
 376                         break;
 377                 case 3:
 378                         passed &= !rc;
 379                         passed &= (args.args_count == 1);
 380                         passed &= (args.args[0] == 9);
 381                         break;
 382                 case 4:
 383                         passed &= !rc;
 384                         passed &= (args.args_count == 3);
 385                         passed &= (args.args[0] == 10);
 386                         passed &= (args.args[1] == 11);
 387                         passed &= (args.args[2] == 12);
 388                         break;
 389                 case 5:
 390                         passed &= !rc;
 391                         passed &= (args.args_count == 2);
 392                         passed &= (args.args[0] == 13);
 393                         passed &= (args.args[1] == 14);
 394                         break;
 395                 case 6:
 396                         passed &= !rc;
 397                         passed &= (args.args_count == 1);
 398                         passed &= (args.args[0] == 15);
 399                         break;
 400                 default:
 401                         passed = false;
 402                 }
 403
 404                 selftest(passed, "index %i - data error on node %s rc=%i\n",
 405                          i, args.np->full_name, rc);
 406         }
 407         of_node_put(np);
 408 }
 409
 410 static struct of_device_id match_node_table[] = {
 411         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 412         { .data = "B", .type = "type1", }, /* followed by type alone */
 413
 414         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 415         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 416         { .data = "Cc", .name = "name2", .type = "type2", },
 417
 418         { .data = "E", .compatible = "compat3" },
 419         { .data = "G", .compatible = "compat2", },
 420         { .data = "H", .compatible = "compat2", .name = "name5", },
 421         { .data = "I", .compatible = "compat2", .type = "type1", },
 422         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 423         { .data = "K", .compatible = "compat2", .name = "name9", },
 424         {}
 425 };
 426
 427 static struct {
 428         const char *path;
 429         const char *data;
 430 } match_node_tests[] = {
 431         { .path = "/testcase-data/match-node/name0", .data = "A", },
 432         { .path = "/testcase-data/match-node/name1", .data = "B", },
 433         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 434         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 435         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 436         { .path = "/testcase-data/match-node/name3", .data = "E", },
 437         { .path = "/testcase-data/match-node/name4", .data = "G", },
 438         { .path = "/testcase-data/match-node/name5", .data = "H", },
 439         { .path = "/testcase-data/match-node/name6", .data = "G", },
 440         { .path = "/testcase-data/match-node/name7", .data = "I", },
 441         { .path = "/testcase-data/match-node/name8", .data = "J", },
 442         { .path = "/testcase-data/match-node/name9", .data = "K", },
 443 };
 444
 445 static void __init of_selftest_match_node(void)
 446 {
 447         struct device_node *np;
 448         const struct of_device_id *match;
 449         int i;
 450
 451         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 452                 np = of_find_node_by_path(match_node_tests[i].path);
 453                 if (!np) {
 454                         selftest(0, "missing testcase node %s\n",
 455                                 match_node_tests[i].path);
 456                         continue;
 457                 }
 458
 459                 match = of_match_node(match_node_table, np);
 460                 if (!match) {
 461                         selftest(0, "%s didn't match anything\n",
 462                                 match_node_tests[i].path);
 463                         continue;
 464                 }
 465
 466                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 467                         selftest(0, "%s got wrong match. expected %s, got %s\n",
 468                                 match_node_tests[i].path, match_node_tests[i].data,
 469                                 (const char *)match->data);
 470                         continue;
 471                 }
 472                 selftest(1, "passed");
 473         }
 474 }
 475
 476 static void __init of_selftest_platform_populate(void)
 477 {
 478         int irq;
 479         struct device_node *np, *child;
 480         struct platform_device *pdev;
 481         struct of_device_id match[] = {
 482                 { .compatible = "test-device", },
 483                 {}
 484         };
 485
 486         np = of_find_node_by_path("/testcase-data");
 487         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 488
 489         /* Test that a missing irq domain returns -EPROBE_DEFER */
 490         np = of_find_node_by_path("/testcase-data/testcase-device1");
 491         pdev = of_find_device_by_node(np);
 492         selftest(pdev, "device 1 creation failed\n");
 493
 494         irq = platform_get_irq(pdev, 0);
 495         selftest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 496
 497         /* Test that a parsing failure does not return -EPROBE_DEFER */
 498         np = of_find_node_by_path("/testcase-data/testcase-device2");
 499         pdev = of_find_device_by_node(np);
 500         selftest(pdev, "device 2 creation failed\n");
 501         irq = platform_get_irq(pdev, 0);
 502         selftest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 503
 504         np = of_find_node_by_path("/testcase-data/platform-tests");
 505         if (!np) {
 506                 pr_err("No testcase data in device tree\n");
 507                 return;
 508         }
 509
 510         for_each_child_of_node(np, child) {
 511                 struct device_node *grandchild;
 512                 of_platform_populate(child, match, NULL, NULL);
 513                 for_each_child_of_node(child, grandchild)
 514                         selftest(of_find_device_by_node(grandchild),
 515                                  "Could not create device for node '%s'\n",
 516                                  grandchild->name);
 517         }
 518 }
 519
 520 static int __init of_selftest(void)
 521 {
 522         struct device_node *np;
 523
 524         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 525         if (!np) {
 526                 pr_info("No testcase data in device tree; not running tests\n");
 527                 return 0;
 528         }
 529         of_node_put(np);
 530
 531         pr_info("start of selftest - you will see error messages\n");
 532         of_selftest_find_node_by_name();
 533         of_selftest_dynamic();
 534         of_selftest_parse_phandle_with_args();
 535         of_selftest_property_match_string();
 536         of_selftest_parse_interrupts();
 537         of_selftest_parse_interrupts_extended();
 538         of_selftest_match_node();
 539         of_selftest_platform_populate();
 540         pr_info("end of selftest - %i passed, %i failed\n",
 541                 selftest_results.passed, selftest_results.failed);
 542         return 0;
 543 }
 544 late_initcall(of_selftest);