drivers/of/unittest.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Self tests for device tree subsystem
   4  */
   5
   6 #define pr_fmt(fmt) "### dt-test ### " fmt
   7
   8 #include <linux/bootmem.h>
   9 #include <linux/clk.h>
  10 #include <linux/err.h>
  11 #include <linux/errno.h>
  12 #include <linux/hashtable.h>
  13 #include <linux/libfdt.h>
  14 #include <linux/of.h>
  15 #include <linux/of_fdt.h>
  16 #include <linux/of_irq.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/list.h>
  19 #include <linux/mutex.h>
  20 #include <linux/slab.h>
  21 #include <linux/device.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/i2c.h>
  25 #include <linux/i2c-mux.h>
  26
  27 #include <linux/bitops.h>
  28
  29 #include "of_private.h"
  30
  31 static struct unittest_results {
  32         int passed;
  33         int failed;
  34 } unittest_results;
  35
  36 #define unittest(result, fmt, ...) ({ \
  37         bool failed = !(result); \
  38         if (failed) { \
  39                 unittest_results.failed++; \
  40                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  41         } else { \
  42                 unittest_results.passed++; \
  43                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  44         } \
  45         failed; \
  46 })
  47
  48 static void __init of_unittest_find_node_by_name(void)
  49 {
  50         struct device_node *np;
  51         const char *options, *name;
  52
  53         np = of_find_node_by_path("/testcase-data");
  54         name = kasprintf(GFP_KERNEL, "%pOF", np);
  55         unittest(np && !strcmp("/testcase-data", name),
  56                 "find /testcase-data failed\n");
  57         of_node_put(np);
  58         kfree(name);
  59
  60         /* Test if trailing '/' works */
  61         np = of_find_node_by_path("/testcase-data/");
  62         unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
  63
  64         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  65         name = kasprintf(GFP_KERNEL, "%pOF", np);
  66         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
  67                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  68         of_node_put(np);
  69         kfree(name);
  70
  71         np = of_find_node_by_path("testcase-alias");
  72         name = kasprintf(GFP_KERNEL, "%pOF", np);
  73         unittest(np && !strcmp("/testcase-data", name),
  74                 "find testcase-alias failed\n");
  75         of_node_put(np);
  76         kfree(name);
  77
  78         /* Test if trailing '/' works on aliases */
  79         np = of_find_node_by_path("testcase-alias/");
  80         unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
  81
  82         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  83         name = kasprintf(GFP_KERNEL, "%pOF", np);
  84         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
  85                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  86         of_node_put(np);
  87         kfree(name);
  88
  89         np = of_find_node_by_path("/testcase-data/missing-path");
  90         unittest(!np, "non-existent path returned node %pOF\n", np);
  91         of_node_put(np);
  92
  93         np = of_find_node_by_path("missing-alias");
  94         unittest(!np, "non-existent alias returned node %pOF\n", np);
  95         of_node_put(np);
  96
  97         np = of_find_node_by_path("testcase-alias/missing-path");
  98         unittest(!np, "non-existent alias with relative path returned node %pOF\n", np);
  99         of_node_put(np);
 100
 101         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
 102         unittest(np && !strcmp("testoption", options),
 103                  "option path test failed\n");
 104         of_node_put(np);
 105
 106         np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
 107         unittest(np && !strcmp("test/option", options),
 108                  "option path test, subcase #1 failed\n");
 109         of_node_put(np);
 110
 111         np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
 112         unittest(np && !strcmp("test/option", options),
 113                  "option path test, subcase #2 failed\n");
 114         of_node_put(np);
 115
 116         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
 117         unittest(np, "NULL option path test failed\n");
 118         of_node_put(np);
 119
 120         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 121                                        &options);
 122         unittest(np && !strcmp("testaliasoption", options),
 123                  "option alias path test failed\n");
 124         of_node_put(np);
 125
 126         np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
 127                                        &options);
 128         unittest(np && !strcmp("test/alias/option", options),
 129                  "option alias path test, subcase #1 failed\n");
 130         of_node_put(np);
 131
 132         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 133         unittest(np, "NULL option alias path test failed\n");
 134         of_node_put(np);
 135
 136         options = "testoption";
 137         np = of_find_node_opts_by_path("testcase-alias", &options);
 138         unittest(np && !options, "option clearing test failed\n");
 139         of_node_put(np);
 140
 141         options = "testoption";
 142         np = of_find_node_opts_by_path("/", &options);
 143         unittest(np && !options, "option clearing root node test failed\n");
 144         of_node_put(np);
 145 }
 146
 147 static void __init of_unittest_dynamic(void)
 148 {
 149         struct device_node *np;
 150         struct property *prop;
 151
 152         np = of_find_node_by_path("/testcase-data");
 153         if (!np) {
 154                 pr_err("missing testcase data\n");
 155                 return;
 156         }
 157
 158         /* Array of 4 properties for the purpose of testing */
 159         prop = kcalloc(4, sizeof(*prop), GFP_KERNEL);
 160         if (!prop) {
 161                 unittest(0, "kzalloc() failed\n");
 162                 return;
 163         }
 164
 165         /* Add a new property - should pass*/
 166         prop->name = "new-property";
 167         prop->value = "new-property-data";
 168         prop->length = strlen(prop->value) + 1;
 169         unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 170
 171         /* Try to add an existing property - should fail */
 172         prop++;
 173         prop->name = "new-property";
 174         prop->value = "new-property-data-should-fail";
 175         prop->length = strlen(prop->value) + 1;
 176         unittest(of_add_property(np, prop) != 0,
 177                  "Adding an existing property should have failed\n");
 178
 179         /* Try to modify an existing property - should pass */
 180         prop->value = "modify-property-data-should-pass";
 181         prop->length = strlen(prop->value) + 1;
 182         unittest(of_update_property(np, prop) == 0,
 183                  "Updating an existing property should have passed\n");
 184
 185         /* Try to modify non-existent property - should pass*/
 186         prop++;
 187         prop->name = "modify-property";
 188         prop->value = "modify-missing-property-data-should-pass";
 189         prop->length = strlen(prop->value) + 1;
 190         unittest(of_update_property(np, prop) == 0,
 191                  "Updating a missing property should have passed\n");
 192
 193         /* Remove property - should pass */
 194         unittest(of_remove_property(np, prop) == 0,
 195                  "Removing a property should have passed\n");
 196
 197         /* Adding very large property - should pass */
 198         prop++;
 199         prop->name = "large-property-PAGE_SIZEx8";
 200         prop->length = PAGE_SIZE * 8;
 201         prop->value = kzalloc(prop->length, GFP_KERNEL);
 202         unittest(prop->value != NULL, "Unable to allocate large buffer\n");
 203         if (prop->value)
 204                 unittest(of_add_property(np, prop) == 0,
 205                          "Adding a large property should have passed\n");
 206 }
 207
 208 static int __init of_unittest_check_node_linkage(struct device_node *np)
 209 {
 210         struct device_node *child;
 211         int count = 0, rc;
 212
 213         for_each_child_of_node(np, child) {
 214                 if (child->parent != np) {
 215                         pr_err("Child node %s links to wrong parent %s\n",
 216                                  child->name, np->name);
 217                         rc = -EINVAL;
 218                         goto put_child;
 219                 }
 220
 221                 rc = of_unittest_check_node_linkage(child);
 222                 if (rc < 0)
 223                         goto put_child;
 224                 count += rc;
 225         }
 226
 227         return count + 1;
 228 put_child:
 229         of_node_put(child);
 230         return rc;
 231 }
 232
 233 static void __init of_unittest_check_tree_linkage(void)
 234 {
 235         struct device_node *np;
 236         int allnode_count = 0, child_count;
 237
 238         if (!of_root)
 239                 return;
 240
 241         for_each_of_allnodes(np)
 242                 allnode_count++;
 243         child_count = of_unittest_check_node_linkage(of_root);
 244
 245         unittest(child_count > 0, "Device node data structure is corrupted\n");
 246         unittest(child_count == allnode_count,
 247                  "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
 248                  allnode_count, child_count);
 249         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 250 }
 251
 252 static void __init of_unittest_printf_one(struct device_node *np, const char *fmt,
 253                                           const char *expected)
 254 {
 255         unsigned char *buf;
 256         int buf_size;
 257         int size, i;
 258
 259         buf_size = strlen(expected) + 10;
 260         buf = kmalloc(buf_size, GFP_KERNEL);
 261         if (!buf)
 262                 return;
 263
 264         /* Baseline; check conversion with a large size limit */
 265         memset(buf, 0xff, buf_size);
 266         size = snprintf(buf, buf_size - 2, fmt, np);
 267
 268         /* use strcmp() instead of strncmp() here to be absolutely sure strings match */
 269         unittest((strcmp(buf, expected) == 0) && (buf[size+1] == 0xff),
 270                 "sprintf failed; fmt='%s' expected='%s' rslt='%s'\n",
 271                 fmt, expected, buf);
 272
 273         /* Make sure length limits work */
 274         size++;
 275         for (i = 0; i < 2; i++, size--) {
 276                 /* Clear the buffer, and make sure it works correctly still */
 277                 memset(buf, 0xff, buf_size);
 278                 snprintf(buf, size+1, fmt, np);
 279                 unittest(strncmp(buf, expected, size) == 0 && (buf[size+1] == 0xff),
 280                         "snprintf failed; size=%i fmt='%s' expected='%s' rslt='%s'\n",
 281                         size, fmt, expected, buf);
 282         }
 283         kfree(buf);
 284 }
 285
 286 static void __init of_unittest_printf(void)
 287 {
 288         struct device_node *np;
 289         const char *full_name = "/testcase-data/platform-tests/test-device@1/dev@100";
 290         char phandle_str[16] = "";
 291
 292         np = of_find_node_by_path(full_name);
 293         if (!np) {
 294                 unittest(np, "testcase data missing\n");
 295                 return;
 296         }
 297
 298         num_to_str(phandle_str, sizeof(phandle_str), np->phandle, 0);
 299
 300         of_unittest_printf_one(np, "%pOF",  full_name);
 301         of_unittest_printf_one(np, "%pOFf", full_name);
 302         of_unittest_printf_one(np, "%pOFp", phandle_str);
 303         of_unittest_printf_one(np, "%pOFP", "dev@100");
 304         of_unittest_printf_one(np, "ABC %pOFP ABC", "ABC dev@100 ABC");
 305         of_unittest_printf_one(np, "%10pOFP", "   dev@100");
 306         of_unittest_printf_one(np, "%-10pOFP", "dev@100   ");
 307         of_unittest_printf_one(of_root, "%pOFP", "/");
 308         of_unittest_printf_one(np, "%pOFF", "----");
 309         of_unittest_printf_one(np, "%pOFPF", "dev@100:----");
 310         of_unittest_printf_one(np, "%pOFPFPc", "dev@100:----:dev@100:test-sub-device");
 311         of_unittest_printf_one(np, "%pOFc", "test-sub-device");
 312         of_unittest_printf_one(np, "%pOFC",
 313                         "\"test-sub-device\",\"test-compat2\",\"test-compat3\"");
 314 }
 315
 316 struct node_hash {
 317         struct hlist_node node;
 318         struct device_node *np;
 319 };
 320
 321 static DEFINE_HASHTABLE(phandle_ht, 8);
 322 static void __init of_unittest_check_phandles(void)
 323 {
 324         struct device_node *np;
 325         struct node_hash *nh;
 326         struct hlist_node *tmp;
 327         int i, dup_count = 0, phandle_count = 0;
 328
 329         for_each_of_allnodes(np) {
 330                 if (!np->phandle)
 331                         continue;
 332
 333                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 334                         if (nh->np->phandle == np->phandle) {
 335                                 pr_info("Duplicate phandle! %i used by %pOF and %pOF\n",
 336                                         np->phandle, nh->np, np);
 337                                 dup_count++;
 338                                 break;
 339                         }
 340                 }
 341
 342                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 343                 if (WARN_ON(!nh))
 344                         return;
 345
 346                 nh->np = np;
 347                 hash_add(phandle_ht, &nh->node, np->phandle);
 348                 phandle_count++;
 349         }
 350         unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 351                  dup_count, phandle_count);
 352
 353         /* Clean up */
 354         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 355                 hash_del(&nh->node);
 356                 kfree(nh);
 357         }
 358 }
 359
 360 static void __init of_unittest_parse_phandle_with_args(void)
 361 {
 362         struct device_node *np;
 363         struct of_phandle_args args;
 364         int i, rc;
 365
 366         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 367         if (!np) {
 368                 pr_err("missing testcase data\n");
 369                 return;
 370         }
 371
 372         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 373         unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 374
 375         for (i = 0; i < 8; i++) {
 376                 bool passed = true;
 377
 378                 rc = of_parse_phandle_with_args(np, "phandle-list",
 379                                                 "#phandle-cells", i, &args);
 380
 381                 /* Test the values from tests-phandle.dtsi */
 382                 switch (i) {
 383                 case 0:
 384                         passed &= !rc;
 385                         passed &= (args.args_count == 1);
 386                         passed &= (args.args[0] == (i + 1));
 387                         break;
 388                 case 1:
 389                         passed &= !rc;
 390                         passed &= (args.args_count == 2);
 391                         passed &= (args.args[0] == (i + 1));
 392                         passed &= (args.args[1] == 0);
 393                         break;
 394                 case 2:
 395                         passed &= (rc == -ENOENT);
 396                         break;
 397                 case 3:
 398                         passed &= !rc;
 399                         passed &= (args.args_count == 3);
 400                         passed &= (args.args[0] == (i + 1));
 401                         passed &= (args.args[1] == 4);
 402                         passed &= (args.args[2] == 3);
 403                         break;
 404                 case 4:
 405                         passed &= !rc;
 406                         passed &= (args.args_count == 2);
 407                         passed &= (args.args[0] == (i + 1));
 408                         passed &= (args.args[1] == 100);
 409                         break;
 410                 case 5:
 411                         passed &= !rc;
 412                         passed &= (args.args_count == 0);
 413                         break;
 414                 case 6:
 415                         passed &= !rc;
 416                         passed &= (args.args_count == 1);
 417                         passed &= (args.args[0] == (i + 1));
 418                         break;
 419                 case 7:
 420                         passed &= (rc == -ENOENT);
 421                         break;
 422                 default:
 423                         passed = false;
 424                 }
 425
 426                 unittest(passed, "index %i - data error on node %pOF rc=%i\n",
 427                          i, args.np, rc);
 428         }
 429
 430         /* Check for missing list property */
 431         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 432                                         "#phandle-cells", 0, &args);
 433         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 434         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 435                                         "#phandle-cells");
 436         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 437
 438         /* Check for missing cells property */
 439         rc = of_parse_phandle_with_args(np, "phandle-list",
 440                                         "#phandle-cells-missing", 0, &args);
 441         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 442         rc = of_count_phandle_with_args(np, "phandle-list",
 443                                         "#phandle-cells-missing");
 444         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 445
 446         /* Check for bad phandle in list */
 447         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 448                                         "#phandle-cells", 0, &args);
 449         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 450         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 451                                         "#phandle-cells");
 452         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 453
 454         /* Check for incorrectly formed argument list */
 455         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 456                                         "#phandle-cells", 1, &args);
 457         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 458         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 459                                         "#phandle-cells");
 460         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 461 }
 462
 463 static void __init of_unittest_parse_phandle_with_args_map(void)
 464 {
 465         struct device_node *np, *p0, *p1, *p2, *p3;
 466         struct of_phandle_args args;
 467         int i, rc;
 468
 469         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-b");
 470         if (!np) {
 471                 pr_err("missing testcase data\n");
 472                 return;
 473         }
 474
 475         p0 = of_find_node_by_path("/testcase-data/phandle-tests/provider0");
 476         if (!p0) {
 477                 pr_err("missing testcase data\n");
 478                 return;
 479         }
 480
 481         p1 = of_find_node_by_path("/testcase-data/phandle-tests/provider1");
 482         if (!p1) {
 483                 pr_err("missing testcase data\n");
 484                 return;
 485         }
 486
 487         p2 = of_find_node_by_path("/testcase-data/phandle-tests/provider2");
 488         if (!p2) {
 489                 pr_err("missing testcase data\n");
 490                 return;
 491         }
 492
 493         p3 = of_find_node_by_path("/testcase-data/phandle-tests/provider3");
 494         if (!p3) {
 495                 pr_err("missing testcase data\n");
 496                 return;
 497         }
 498
 499         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 500         unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 501
 502         for (i = 0; i < 8; i++) {
 503                 bool passed = true;
 504
 505                 rc = of_parse_phandle_with_args_map(np, "phandle-list",
 506                                                     "phandle", i, &args);
 507
 508                 /* Test the values from tests-phandle.dtsi */
 509                 switch (i) {
 510                 case 0:
 511                         passed &= !rc;
 512                         passed &= (args.np == p1);
 513                         passed &= (args.args_count == 1);
 514                         passed &= (args.args[0] == 1);
 515                         break;
 516                 case 1:
 517                         passed &= !rc;
 518                         passed &= (args.np == p3);
 519                         passed &= (args.args_count == 3);
 520                         passed &= (args.args[0] == 2);
 521                         passed &= (args.args[1] == 5);
 522                         passed &= (args.args[2] == 3);
 523                         break;
 524                 case 2:
 525                         passed &= (rc == -ENOENT);
 526                         break;
 527                 case 3:
 528                         passed &= !rc;
 529                         passed &= (args.np == p0);
 530                         passed &= (args.args_count == 0);
 531                         break;
 532                 case 4:
 533                         passed &= !rc;
 534                         passed &= (args.np == p1);
 535                         passed &= (args.args_count == 1);
 536                         passed &= (args.args[0] == 3);
 537                         break;
 538                 case 5:
 539                         passed &= !rc;
 540                         passed &= (args.np == p0);
 541                         passed &= (args.args_count == 0);
 542                         break;
 543                 case 6:
 544                         passed &= !rc;
 545                         passed &= (args.np == p2);
 546                         passed &= (args.args_count == 2);
 547                         passed &= (args.args[0] == 15);
 548                         passed &= (args.args[1] == 0x20);
 549                         break;
 550                 case 7:
 551                         passed &= (rc == -ENOENT);
 552                         break;
 553                 default:
 554                         passed = false;
 555                 }
 556
 557                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 558                          i, args.np->full_name, rc);
 559         }
 560
 561         /* Check for missing list property */
 562         rc = of_parse_phandle_with_args_map(np, "phandle-list-missing",
 563                                             "phandle", 0, &args);
 564         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 565
 566         /* Check for missing cells,map,mask property */
 567         rc = of_parse_phandle_with_args_map(np, "phandle-list",
 568                                             "phandle-missing", 0, &args);
 569         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 570
 571         /* Check for bad phandle in list */
 572         rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-phandle",
 573                                             "phandle", 0, &args);
 574         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 575
 576         /* Check for incorrectly formed argument list */
 577         rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-args",
 578                                             "phandle", 1, &args);
 579         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 580 }
 581
 582 static void __init of_unittest_property_string(void)
 583 {
 584         const char *strings[4];
 585         struct device_node *np;
 586         int rc;
 587
 588         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 589         if (!np) {
 590                 pr_err("No testcase data in device tree\n");
 591                 return;
 592         }
 593
 594         rc = of_property_match_string(np, "phandle-list-names", "first");
 595         unittest(rc == 0, "first expected:0 got:%i\n", rc);
 596         rc = of_property_match_string(np, "phandle-list-names", "second");
 597         unittest(rc == 1, "second expected:1 got:%i\n", rc);
 598         rc = of_property_match_string(np, "phandle-list-names", "third");
 599         unittest(rc == 2, "third expected:2 got:%i\n", rc);
 600         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 601         unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 602         rc = of_property_match_string(np, "missing-property", "blah");
 603         unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 604         rc = of_property_match_string(np, "empty-property", "blah");
 605         unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 606         rc = of_property_match_string(np, "unterminated-string", "blah");
 607         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 608
 609         /* of_property_count_strings() tests */
 610         rc = of_property_count_strings(np, "string-property");
 611         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 612         rc = of_property_count_strings(np, "phandle-list-names");
 613         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 614         rc = of_property_count_strings(np, "unterminated-string");
 615         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 616         rc = of_property_count_strings(np, "unterminated-string-list");
 617         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 618
 619         /* of_property_read_string_index() tests */
 620         rc = of_property_read_string_index(np, "string-property", 0, strings);
 621         unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 622         strings[0] = NULL;
 623         rc = of_property_read_string_index(np, "string-property", 1, strings);
 624         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 625         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 626         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 627         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 628         unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 629         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 630         unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 631         strings[0] = NULL;
 632         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 633         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 634         strings[0] = NULL;
 635         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 636         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 637         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 638         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 639         strings[0] = NULL;
 640         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 641         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 642         strings[1] = NULL;
 643
 644         /* of_property_read_string_array() tests */
 645         rc = of_property_read_string_array(np, "string-property", strings, 4);
 646         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 647         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 648         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 649         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 650         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 651         /* -- An incorrectly formed string should cause a failure */
 652         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 653         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 654         /* -- parsing the correctly formed strings should still work: */
 655         strings[2] = NULL;
 656         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 657         unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 658         strings[1] = NULL;
 659         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 660         unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 661 }
 662
 663 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 664                         (p1)->value && (p2)->value && \
 665                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 666                         !strcmp((p1)->name, (p2)->name))
 667 static void __init of_unittest_property_copy(void)
 668 {
 669 #ifdef CONFIG_OF_DYNAMIC
 670         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 671         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 672         struct property *new;
 673
 674         new = __of_prop_dup(&p1, GFP_KERNEL);
 675         unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 676         kfree(new->value);
 677         kfree(new->name);
 678         kfree(new);
 679
 680         new = __of_prop_dup(&p2, GFP_KERNEL);
 681         unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 682         kfree(new->value);
 683         kfree(new->name);
 684         kfree(new);
 685 #endif
 686 }
 687
 688 static void __init of_unittest_changeset(void)
 689 {
 690 #ifdef CONFIG_OF_DYNAMIC
 691         struct property *ppadd, padd = { .name = "prop-add", .length = 1, .value = "" };
 692         struct property *ppname_n1,  pname_n1  = { .name = "name", .length = 3, .value = "n1"  };
 693         struct property *ppname_n2,  pname_n2  = { .name = "name", .length = 3, .value = "n2"  };
 694         struct property *ppname_n21, pname_n21 = { .name = "name", .length = 3, .value = "n21" };
 695         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 696         struct property *ppremove;
 697         struct device_node *n1, *n2, *n21, *nchangeset, *nremove, *parent, *np;
 698         struct of_changeset chgset;
 699
 700         n1 = __of_node_dup(NULL, "n1");
 701         unittest(n1, "testcase setup failure\n");
 702
 703         n2 = __of_node_dup(NULL, "n2");
 704         unittest(n2, "testcase setup failure\n");
 705
 706         n21 = __of_node_dup(NULL, "n21");
 707         unittest(n21, "testcase setup failure %p\n", n21);
 708
 709         nchangeset = of_find_node_by_path("/testcase-data/changeset");
 710         nremove = of_get_child_by_name(nchangeset, "node-remove");
 711         unittest(nremove, "testcase setup failure\n");
 712
 713         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 714         unittest(ppadd, "testcase setup failure\n");
 715
 716         ppname_n1  = __of_prop_dup(&pname_n1, GFP_KERNEL);
 717         unittest(ppname_n1, "testcase setup failure\n");
 718
 719         ppname_n2  = __of_prop_dup(&pname_n2, GFP_KERNEL);
 720         unittest(ppname_n2, "testcase setup failure\n");
 721
 722         ppname_n21 = __of_prop_dup(&pname_n21, GFP_KERNEL);
 723         unittest(ppname_n21, "testcase setup failure\n");
 724
 725         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 726         unittest(ppupdate, "testcase setup failure\n");
 727
 728         parent = nchangeset;
 729         n1->parent = parent;
 730         n2->parent = parent;
 731         n21->parent = n2;
 732
 733         ppremove = of_find_property(parent, "prop-remove", NULL);
 734         unittest(ppremove, "failed to find removal prop");
 735
 736         of_changeset_init(&chgset);
 737
 738         unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 739         unittest(!of_changeset_add_property(&chgset, n1, ppname_n1), "fail add prop name\n");
 740
 741         unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 742         unittest(!of_changeset_add_property(&chgset, n2, ppname_n2), "fail add prop name\n");
 743
 744         unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 745         unittest(!of_changeset_add_property(&chgset, n21, ppname_n21), "fail add prop name\n");
 746
 747         unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 748
 749         unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop prop-add\n");
 750         unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 751         unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 752
 753         unittest(!of_changeset_apply(&chgset), "apply failed\n");
 754
 755         of_node_put(nchangeset);
 756
 757         /* Make sure node names are constructed correctly */
 758         unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 759                  "'%pOF' not added\n", n21);
 760         of_node_put(np);
 761
 762         unittest(!of_changeset_revert(&chgset), "revert failed\n");
 763
 764         of_changeset_destroy(&chgset);
 765 #endif
 766 }
 767
 768 static void __init of_unittest_parse_interrupts(void)
 769 {
 770         struct device_node *np;
 771         struct of_phandle_args args;
 772         int i, rc;
 773
 774         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 775         if (!np) {
 776                 pr_err("missing testcase data\n");
 777                 return;
 778         }
 779
 780         for (i = 0; i < 4; i++) {
 781                 bool passed = true;
 782
 783                 args.args_count = 0;
 784                 rc = of_irq_parse_one(np, i, &args);
 785
 786                 passed &= !rc;
 787                 passed &= (args.args_count == 1);
 788                 passed &= (args.args[0] == (i + 1));
 789
 790                 unittest(passed, "index %i - data error on node %pOF rc=%i\n",
 791                          i, args.np, rc);
 792         }
 793         of_node_put(np);
 794
 795         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 796         if (!np) {
 797                 pr_err("missing testcase data\n");
 798                 return;
 799         }
 800
 801         for (i = 0; i < 4; i++) {
 802                 bool passed = true;
 803
 804                 args.args_count = 0;
 805                 rc = of_irq_parse_one(np, i, &args);
 806
 807                 /* Test the values from tests-phandle.dtsi */
 808                 switch (i) {
 809                 case 0:
 810                         passed &= !rc;
 811                         passed &= (args.args_count == 1);
 812                         passed &= (args.args[0] == 9);
 813                         break;
 814                 case 1:
 815                         passed &= !rc;
 816                         passed &= (args.args_count == 3);
 817                         passed &= (args.args[0] == 10);
 818                         passed &= (args.args[1] == 11);
 819                         passed &= (args.args[2] == 12);
 820                         break;
 821                 case 2:
 822                         passed &= !rc;
 823                         passed &= (args.args_count == 2);
 824                         passed &= (args.args[0] == 13);
 825                         passed &= (args.args[1] == 14);
 826                         break;
 827                 case 3:
 828                         passed &= !rc;
 829                         passed &= (args.args_count == 2);
 830                         passed &= (args.args[0] == 15);
 831                         passed &= (args.args[1] == 16);
 832                         break;
 833                 default:
 834                         passed = false;
 835                 }
 836                 unittest(passed, "index %i - data error on node %pOF rc=%i\n",
 837                          i, args.np, rc);
 838         }
 839         of_node_put(np);
 840 }
 841
 842 static void __init of_unittest_parse_interrupts_extended(void)
 843 {
 844         struct device_node *np;
 845         struct of_phandle_args args;
 846         int i, rc;
 847
 848         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 849         if (!np) {
 850                 pr_err("missing testcase data\n");
 851                 return;
 852         }
 853
 854         for (i = 0; i < 7; i++) {
 855                 bool passed = true;
 856
 857                 rc = of_irq_parse_one(np, i, &args);
 858
 859                 /* Test the values from tests-phandle.dtsi */
 860                 switch (i) {
 861                 case 0:
 862                         passed &= !rc;
 863                         passed &= (args.args_count == 1);
 864                         passed &= (args.args[0] == 1);
 865                         break;
 866                 case 1:
 867                         passed &= !rc;
 868                         passed &= (args.args_count == 3);
 869                         passed &= (args.args[0] == 2);
 870                         passed &= (args.args[1] == 3);
 871                         passed &= (args.args[2] == 4);
 872                         break;
 873                 case 2:
 874                         passed &= !rc;
 875                         passed &= (args.args_count == 2);
 876                         passed &= (args.args[0] == 5);
 877                         passed &= (args.args[1] == 6);
 878                         break;
 879                 case 3:
 880                         passed &= !rc;
 881                         passed &= (args.args_count == 1);
 882                         passed &= (args.args[0] == 9);
 883                         break;
 884                 case 4:
 885                         passed &= !rc;
 886                         passed &= (args.args_count == 3);
 887                         passed &= (args.args[0] == 10);
 888                         passed &= (args.args[1] == 11);
 889                         passed &= (args.args[2] == 12);
 890                         break;
 891                 case 5:
 892                         passed &= !rc;
 893                         passed &= (args.args_count == 2);
 894                         passed &= (args.args[0] == 13);
 895                         passed &= (args.args[1] == 14);
 896                         break;
 897                 case 6:
 898                         passed &= !rc;
 899                         passed &= (args.args_count == 1);
 900                         passed &= (args.args[0] == 15);
 901                         break;
 902                 default:
 903                         passed = false;
 904                 }
 905
 906                 unittest(passed, "index %i - data error on node %pOF rc=%i\n",
 907                          i, args.np, rc);
 908         }
 909         of_node_put(np);
 910 }
 911
 912 static const struct of_device_id match_node_table[] = {
 913         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 914         { .data = "B", .type = "type1", }, /* followed by type alone */
 915
 916         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 917         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 918         { .data = "Cc", .name = "name2", .type = "type2", },
 919
 920         { .data = "E", .compatible = "compat3" },
 921         { .data = "G", .compatible = "compat2", },
 922         { .data = "H", .compatible = "compat2", .name = "name5", },
 923         { .data = "I", .compatible = "compat2", .type = "type1", },
 924         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 925         { .data = "K", .compatible = "compat2", .name = "name9", },
 926         {}
 927 };
 928
 929 static struct {
 930         const char *path;
 931         const char *data;
 932 } match_node_tests[] = {
 933         { .path = "/testcase-data/match-node/name0", .data = "A", },
 934         { .path = "/testcase-data/match-node/name1", .data = "B", },
 935         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 936         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 937         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 938         { .path = "/testcase-data/match-node/name3", .data = "E", },
 939         { .path = "/testcase-data/match-node/name4", .data = "G", },
 940         { .path = "/testcase-data/match-node/name5", .data = "H", },
 941         { .path = "/testcase-data/match-node/name6", .data = "G", },
 942         { .path = "/testcase-data/match-node/name7", .data = "I", },
 943         { .path = "/testcase-data/match-node/name8", .data = "J", },
 944         { .path = "/testcase-data/match-node/name9", .data = "K", },
 945 };
 946
 947 static void __init of_unittest_match_node(void)
 948 {
 949         struct device_node *np;
 950         const struct of_device_id *match;
 951         int i;
 952
 953         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 954                 np = of_find_node_by_path(match_node_tests[i].path);
 955                 if (!np) {
 956                         unittest(0, "missing testcase node %s\n",
 957                                 match_node_tests[i].path);
 958                         continue;
 959                 }
 960
 961                 match = of_match_node(match_node_table, np);
 962                 if (!match) {
 963                         unittest(0, "%s didn't match anything\n",
 964                                 match_node_tests[i].path);
 965                         continue;
 966                 }
 967
 968                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 969                         unittest(0, "%s got wrong match. expected %s, got %s\n",
 970                                 match_node_tests[i].path, match_node_tests[i].data,
 971                                 (const char *)match->data);
 972                         continue;
 973                 }
 974                 unittest(1, "passed");
 975         }
 976 }
 977
 978 static struct resource test_bus_res = {
 979         .start = 0xfffffff8,
 980         .end = 0xfffffff9,
 981         .flags = IORESOURCE_MEM,
 982 };
 983 static const struct platform_device_info test_bus_info = {
 984         .name = "unittest-bus",
 985 };
 986 static void __init of_unittest_platform_populate(void)
 987 {
 988         int irq, rc;
 989         struct device_node *np, *child, *grandchild;
 990         struct platform_device *pdev, *test_bus;
 991         const struct of_device_id match[] = {
 992                 { .compatible = "test-device", },
 993                 {}
 994         };
 995
 996         np = of_find_node_by_path("/testcase-data");
 997         of_platform_default_populate(np, NULL, NULL);
 998
 999         /* Test that a missing irq domain returns -EPROBE_DEFER */
1000         np = of_find_node_by_path("/testcase-data/testcase-device1");
1001         pdev = of_find_device_by_node(np);
1002         unittest(pdev, "device 1 creation failed\n");
1003
1004         irq = platform_get_irq(pdev, 0);
1005         unittest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
1006
1007         /* Test that a parsing failure does not return -EPROBE_DEFER */
1008         np = of_find_node_by_path("/testcase-data/testcase-device2");
1009         pdev = of_find_device_by_node(np);
1010         unittest(pdev, "device 2 creation failed\n");
1011         irq = platform_get_irq(pdev, 0);
1012         unittest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
1013
1014         np = of_find_node_by_path("/testcase-data/platform-tests");
1015         unittest(np, "No testcase data in device tree\n");
1016         if (!np)
1017                 return;
1018
1019         test_bus = platform_device_register_full(&test_bus_info);
1020         rc = PTR_ERR_OR_ZERO(test_bus);
1021         unittest(!rc, "testbus registration failed; rc=%i\n", rc);
1022         if (rc)
1023                 return;
1024         test_bus->dev.of_node = np;
1025
1026         /*
1027          * Add a dummy resource to the test bus node after it is
1028          * registered to catch problems with un-inserted resources. The
1029          * DT code doesn't insert the resources, and it has caused the
1030          * kernel to oops in the past. This makes sure the same bug
1031          * doesn't crop up again.
1032          */
1033         platform_device_add_resources(test_bus, &test_bus_res, 1);
1034
1035         of_platform_populate(np, match, NULL, &test_bus->dev);
1036         for_each_child_of_node(np, child) {
1037                 for_each_child_of_node(child, grandchild)
1038                         unittest(of_find_device_by_node(grandchild),
1039                                  "Could not create device for node '%s'\n",
1040                                  grandchild->name);
1041         }
1042
1043         of_platform_depopulate(&test_bus->dev);
1044         for_each_child_of_node(np, child) {
1045                 for_each_child_of_node(child, grandchild)
1046                         unittest(!of_find_device_by_node(grandchild),
1047                                  "device didn't get destroyed '%s'\n",
1048                                  grandchild->name);
1049         }
1050
1051         platform_device_unregister(test_bus);
1052         of_node_put(np);
1053 }
1054
1055 /**
1056  *      update_node_properties - adds the properties
1057  *      of np into dup node (present in live tree) and
1058  *      updates parent of children of np to dup.
1059  *
1060  *      @np:    node already present in live tree
1061  *      @dup:   node present in live tree to be updated
1062  */
1063 static void update_node_properties(struct device_node *np,
1064                                         struct device_node *dup)
1065 {
1066         struct property *prop;
1067         struct device_node *child;
1068
1069         for_each_property_of_node(np, prop)
1070                 of_add_property(dup, prop);
1071
1072         for_each_child_of_node(np, child)
1073                 child->parent = dup;
1074 }
1075
1076 /**
1077  *      attach_node_and_children - attaches nodes
1078  *      and its children to live tree
1079  *
1080  *      @np:    Node to attach to live tree
1081  */
1082 static int attach_node_and_children(struct device_node *np)
1083 {
1084         struct device_node *next, *dup, *child;
1085         unsigned long flags;
1086         const char *full_name;
1087
1088         full_name = kasprintf(GFP_KERNEL, "%pOF", np);
1089         dup = of_find_node_by_path(full_name);
1090         kfree(full_name);
1091         if (dup) {
1092                 update_node_properties(np, dup);
1093                 return 0;
1094         }
1095
1096         child = np->child;
1097         np->child = NULL;
1098
1099         mutex_lock(&of_mutex);
1100         raw_spin_lock_irqsave(&devtree_lock, flags);
1101         np->sibling = np->parent->child;
1102         np->parent->child = np;
1103         of_node_clear_flag(np, OF_DETACHED);
1104         raw_spin_unlock_irqrestore(&devtree_lock, flags);
1105
1106         __of_attach_node_sysfs(np);
1107         mutex_unlock(&of_mutex);
1108
1109         while (child) {
1110                 next = child->sibling;
1111                 attach_node_and_children(child);
1112                 child = next;
1113         }
1114
1115         return 0;
1116 }
1117
1118 /**
1119  *      unittest_data_add - Reads, copies data from
1120  *      linked tree and attaches it to the live tree
1121  */
1122 static int __init unittest_data_add(void)
1123 {
1124         void *unittest_data;
1125         struct device_node *unittest_data_node, *np;
1126         /*
1127          * __dtb_testcases_begin[] and __dtb_testcases_end[] are magically
1128          * created by cmd_dt_S_dtb in scripts/Makefile.lib
1129          */
1130         extern uint8_t __dtb_testcases_begin[];
1131         extern uint8_t __dtb_testcases_end[];
1132         const int size = __dtb_testcases_end - __dtb_testcases_begin;
1133         int rc;
1134
1135         if (!size) {
1136                 pr_warn("%s: No testcase data to attach; not running tests\n",
1137                         __func__);
1138                 return -ENODATA;
1139         }
1140
1141         /* creating copy */
1142         unittest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
1143
1144         if (!unittest_data) {
1145                 pr_warn("%s: Failed to allocate memory for unittest_data; "
1146                         "not running tests\n", __func__);
1147                 return -ENOMEM;
1148         }
1149         of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
1150         if (!unittest_data_node) {
1151                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
1152                 return -ENODATA;
1153         }
1154
1155         /*
1156          * This lock normally encloses of_resolve_phandles()
1157          */
1158         of_overlay_mutex_lock();
1159
1160         rc = of_resolve_phandles(unittest_data_node);
1161         if (rc) {
1162                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
1163                 of_overlay_mutex_unlock();
1164                 return -EINVAL;
1165         }
1166
1167         if (!of_root) {
1168                 of_root = unittest_data_node;
1169                 for_each_of_allnodes(np)
1170                         __of_attach_node_sysfs(np);
1171                 of_aliases = of_find_node_by_path("/aliases");
1172                 of_chosen = of_find_node_by_path("/chosen");
1173                 of_overlay_mutex_unlock();
1174                 return 0;
1175         }
1176
1177         /* attach the sub-tree to live tree */
1178         np = unittest_data_node->child;
1179         while (np) {
1180                 struct device_node *next = np->sibling;
1181
1182                 np->parent = of_root;
1183                 attach_node_and_children(np);
1184                 np = next;
1185         }
1186
1187         of_overlay_mutex_unlock();
1188
1189         return 0;
1190 }
1191
1192 #ifdef CONFIG_OF_OVERLAY
1193 static int __init overlay_data_apply(const char *overlay_name, int *overlay_id);
1194
1195 static int unittest_probe(struct platform_device *pdev)
1196 {
1197         struct device *dev = &pdev->dev;
1198         struct device_node *np = dev->of_node;
1199
1200         if (np == NULL) {
1201                 dev_err(dev, "No OF data for device\n");
1202                 return -EINVAL;
1203
1204         }
1205
1206         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1207
1208         of_platform_populate(np, NULL, NULL, &pdev->dev);
1209
1210         return 0;
1211 }
1212
1213 static int unittest_remove(struct platform_device *pdev)
1214 {
1215         struct device *dev = &pdev->dev;
1216         struct device_node *np = dev->of_node;
1217
1218         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1219         return 0;
1220 }
1221
1222 static const struct of_device_id unittest_match[] = {
1223         { .compatible = "unittest", },
1224         {},
1225 };
1226
1227 static struct platform_driver unittest_driver = {
1228         .probe                  = unittest_probe,
1229         .remove                 = unittest_remove,
1230         .driver = {
1231                 .name           = "unittest",
1232                 .of_match_table = of_match_ptr(unittest_match),
1233         },
1234 };
1235
1236 /* get the platform device instantiated at the path */
1237 static struct platform_device *of_path_to_platform_device(const char *path)
1238 {
1239         struct device_node *np;
1240         struct platform_device *pdev;
1241
1242         np = of_find_node_by_path(path);
1243         if (np == NULL)
1244                 return NULL;
1245
1246         pdev = of_find_device_by_node(np);
1247         of_node_put(np);
1248
1249         return pdev;
1250 }
1251
1252 /* find out if a platform device exists at that path */
1253 static int of_path_platform_device_exists(const char *path)
1254 {
1255         struct platform_device *pdev;
1256
1257         pdev = of_path_to_platform_device(path);
1258         platform_device_put(pdev);
1259         return pdev != NULL;
1260 }
1261
1262 #if IS_BUILTIN(CONFIG_I2C)
1263
1264 /* get the i2c client device instantiated at the path */
1265 static struct i2c_client *of_path_to_i2c_client(const char *path)
1266 {
1267         struct device_node *np;
1268         struct i2c_client *client;
1269
1270         np = of_find_node_by_path(path);
1271         if (np == NULL)
1272                 return NULL;
1273
1274         client = of_find_i2c_device_by_node(np);
1275         of_node_put(np);
1276
1277         return client;
1278 }
1279
1280 /* find out if a i2c client device exists at that path */
1281 static int of_path_i2c_client_exists(const char *path)
1282 {
1283         struct i2c_client *client;
1284
1285         client = of_path_to_i2c_client(path);
1286         if (client)
1287                 put_device(&client->dev);
1288         return client != NULL;
1289 }
1290 #else
1291 static int of_path_i2c_client_exists(const char *path)
1292 {
1293         return 0;
1294 }
1295 #endif
1296
1297 enum overlay_type {
1298         PDEV_OVERLAY,
1299         I2C_OVERLAY
1300 };
1301
1302 static int of_path_device_type_exists(const char *path,
1303                 enum overlay_type ovtype)
1304 {
1305         switch (ovtype) {
1306         case PDEV_OVERLAY:
1307                 return of_path_platform_device_exists(path);
1308         case I2C_OVERLAY:
1309                 return of_path_i2c_client_exists(path);
1310         }
1311         return 0;
1312 }
1313
1314 static const char *unittest_path(int nr, enum overlay_type ovtype)
1315 {
1316         const char *base;
1317         static char buf[256];
1318
1319         switch (ovtype) {
1320         case PDEV_OVERLAY:
1321                 base = "/testcase-data/overlay-node/test-bus";
1322                 break;
1323         case I2C_OVERLAY:
1324                 base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1325                 break;
1326         default:
1327                 buf[0] = '\0';
1328                 return buf;
1329         }
1330         snprintf(buf, sizeof(buf) - 1, "%s/test-unittest%d", base, nr);
1331         buf[sizeof(buf) - 1] = '\0';
1332         return buf;
1333 }
1334
1335 static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
1336 {
1337         const char *path;
1338
1339         path = unittest_path(unittest_nr, ovtype);
1340
1341         switch (ovtype) {
1342         case PDEV_OVERLAY:
1343                 return of_path_platform_device_exists(path);
1344         case I2C_OVERLAY:
1345                 return of_path_i2c_client_exists(path);
1346         }
1347         return 0;
1348 }
1349
1350 static const char *overlay_name_from_nr(int nr)
1351 {
1352         static char buf[256];
1353
1354         snprintf(buf, sizeof(buf) - 1,
1355                 "overlay_%d", nr);
1356         buf[sizeof(buf) - 1] = '\0';
1357
1358         return buf;
1359 }
1360
1361 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1362
1363 /* it is guaranteed that overlay ids are assigned in sequence */
1364 #define MAX_UNITTEST_OVERLAYS   256
1365 static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_UNITTEST_OVERLAYS)];
1366 static int overlay_first_id = -1;
1367
1368 static void of_unittest_track_overlay(int id)
1369 {
1370         if (overlay_first_id < 0)
1371                 overlay_first_id = id;
1372         id -= overlay_first_id;
1373
1374         /* we shouldn't need that many */
1375         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1376         overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
1377 }
1378
1379 static void of_unittest_untrack_overlay(int id)
1380 {
1381         if (overlay_first_id < 0)
1382                 return;
1383         id -= overlay_first_id;
1384         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1385         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1386 }
1387
1388 static void of_unittest_destroy_tracked_overlays(void)
1389 {
1390         int id, ret, defers, ovcs_id;
1391
1392         if (overlay_first_id < 0)
1393                 return;
1394
1395         /* try until no defers */
1396         do {
1397                 defers = 0;
1398                 /* remove in reverse order */
1399                 for (id = MAX_UNITTEST_OVERLAYS - 1; id >= 0; id--) {
1400                         if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
1401                                 continue;
1402
1403                         ovcs_id = id + overlay_first_id;
1404                         ret = of_overlay_remove(&ovcs_id);
1405                         if (ret == -ENODEV) {
1406                                 pr_warn("%s: no overlay to destroy for #%d\n",
1407                                         __func__, id + overlay_first_id);
1408                                 continue;
1409                         }
1410                         if (ret != 0) {
1411                                 defers++;
1412                                 pr_warn("%s: overlay destroy failed for #%d\n",
1413                                         __func__, id + overlay_first_id);
1414                                 continue;
1415                         }
1416
1417                         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1418                 }
1419         } while (defers > 0);
1420 }
1421
1422 static int __init of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
1423                 int *overlay_id)
1424 {
1425         const char *overlay_name;
1426
1427         overlay_name = overlay_name_from_nr(overlay_nr);
1428
1429         if (!overlay_data_apply(overlay_name, overlay_id)) {
1430                 unittest(0, "could not apply overlay \"%s\"\n",
1431                                 overlay_name);
1432                 return -EFAULT;
1433         }
1434         of_unittest_track_overlay(*overlay_id);
1435
1436         return 0;
1437 }
1438
1439 /* apply an overlay while checking before and after states */
1440 static int __init of_unittest_apply_overlay_check(int overlay_nr,
1441                 int unittest_nr, int before, int after,
1442                 enum overlay_type ovtype)
1443 {
1444         int ret, ovcs_id;
1445
1446         /* unittest device must not be in before state */
1447         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1448                 unittest(0, "%s with device @\"%s\" %s\n",
1449                                 overlay_name_from_nr(overlay_nr),
1450                                 unittest_path(unittest_nr, ovtype),
1451                                 !before ? "enabled" : "disabled");
1452                 return -EINVAL;
1453         }
1454
1455         ovcs_id = 0;
1456         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ovcs_id);
1457         if (ret != 0) {
1458                 /* of_unittest_apply_overlay already called unittest() */
1459                 return ret;
1460         }
1461
1462         /* unittest device must be to set to after state */
1463         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1464                 unittest(0, "%s failed to create @\"%s\" %s\n",
1465                                 overlay_name_from_nr(overlay_nr),
1466                                 unittest_path(unittest_nr, ovtype),
1467                                 !after ? "enabled" : "disabled");
1468                 return -EINVAL;
1469         }
1470
1471         return 0;
1472 }
1473
1474 /* apply an overlay and then revert it while checking before, after states */
1475 static int __init of_unittest_apply_revert_overlay_check(int overlay_nr,
1476                 int unittest_nr, int before, int after,
1477                 enum overlay_type ovtype)
1478 {
1479         int ret, ovcs_id;
1480
1481         /* unittest device must be in before state */
1482         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1483                 unittest(0, "%s with device @\"%s\" %s\n",
1484                                 overlay_name_from_nr(overlay_nr),
1485                                 unittest_path(unittest_nr, ovtype),
1486                                 !before ? "enabled" : "disabled");
1487                 return -EINVAL;
1488         }
1489
1490         /* apply the overlay */
1491         ovcs_id = 0;
1492         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ovcs_id);
1493         if (ret != 0) {
1494                 /* of_unittest_apply_overlay already called unittest() */
1495                 return ret;
1496         }
1497
1498         /* unittest device must be in after state */
1499         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1500                 unittest(0, "%s failed to create @\"%s\" %s\n",
1501                                 overlay_name_from_nr(overlay_nr),
1502                                 unittest_path(unittest_nr, ovtype),
1503                                 !after ? "enabled" : "disabled");
1504                 return -EINVAL;
1505         }
1506
1507         ret = of_overlay_remove(&ovcs_id);
1508         if (ret != 0) {
1509                 unittest(0, "%s failed to be destroyed @\"%s\"\n",
1510                                 overlay_name_from_nr(overlay_nr),
1511                                 unittest_path(unittest_nr, ovtype));
1512                 return ret;
1513         }
1514
1515         /* unittest device must be again in before state */
1516         if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
1517                 unittest(0, "%s with device @\"%s\" %s\n",
1518                                 overlay_name_from_nr(overlay_nr),
1519                                 unittest_path(unittest_nr, ovtype),
1520                                 !before ? "enabled" : "disabled");
1521                 return -EINVAL;
1522         }
1523
1524         return 0;
1525 }
1526
1527 /* test activation of device */
1528 static void __init of_unittest_overlay_0(void)
1529 {
1530         /* device should enable */
1531         if (of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY))
1532                 return;
1533
1534         unittest(1, "overlay test %d passed\n", 0);
1535 }
1536
1537 /* test deactivation of device */
1538 static void __init of_unittest_overlay_1(void)
1539 {
1540         /* device should disable */
1541         if (of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY))
1542                 return;
1543
1544         unittest(1, "overlay test %d passed\n", 1);
1545 }
1546
1547 /* test activation of device */
1548 static void __init of_unittest_overlay_2(void)
1549 {
1550         /* device should enable */
1551         if (of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY))
1552                 return;
1553
1554         unittest(1, "overlay test %d passed\n", 2);
1555 }
1556
1557 /* test deactivation of device */
1558 static void __init of_unittest_overlay_3(void)
1559 {
1560         /* device should disable */
1561         if (of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY))
1562                 return;
1563
1564         unittest(1, "overlay test %d passed\n", 3);
1565 }
1566
1567 /* test activation of a full device node */
1568 static void __init of_unittest_overlay_4(void)
1569 {
1570         /* device should disable */
1571         if (of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY))
1572                 return;
1573
1574         unittest(1, "overlay test %d passed\n", 4);
1575 }
1576
1577 /* test overlay apply/revert sequence */
1578 static void __init of_unittest_overlay_5(void)
1579 {
1580         /* device should disable */
1581         if (of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY))
1582                 return;
1583
1584         unittest(1, "overlay test %d passed\n", 5);
1585 }
1586
1587 /* test overlay application in sequence */
1588 static void __init of_unittest_overlay_6(void)
1589 {
1590         int i, ov_id[2], ovcs_id;
1591         int overlay_nr = 6, unittest_nr = 6;
1592         int before = 0, after = 1;
1593         const char *overlay_name;
1594
1595         /* unittest device must be in before state */
1596         for (i = 0; i < 2; i++) {
1597                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1598                                 != before) {
1599                         unittest(0, "%s with device @\"%s\" %s\n",
1600                                         overlay_name_from_nr(overlay_nr + i),
1601                                         unittest_path(unittest_nr + i,
1602                                                 PDEV_OVERLAY),
1603                                         !before ? "enabled" : "disabled");
1604                         return;
1605                 }
1606         }
1607
1608         /* apply the overlays */
1609         for (i = 0; i < 2; i++) {
1610
1611                 overlay_name = overlay_name_from_nr(overlay_nr + i);
1612
1613                 if (!overlay_data_apply(overlay_name, &ovcs_id)) {
1614                         unittest(0, "could not apply overlay \"%s\"\n",
1615                                         overlay_name);
1616                         return;
1617                 }
1618                 ov_id[i] = ovcs_id;
1619                 of_unittest_track_overlay(ov_id[i]);
1620         }
1621
1622         for (i = 0; i < 2; i++) {
1623                 /* unittest device must be in after state */
1624                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1625                                 != after) {
1626                         unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1627                                         overlay_name_from_nr(overlay_nr + i),
1628                                         unittest_path(unittest_nr + i,
1629                                                 PDEV_OVERLAY),
1630                                         !after ? "enabled" : "disabled");
1631                         return;
1632                 }
1633         }
1634
1635         for (i = 1; i >= 0; i--) {
1636                 ovcs_id = ov_id[i];
1637                 if (of_overlay_remove(&ovcs_id)) {
1638                         unittest(0, "%s failed destroy @\"%s\"\n",
1639                                         overlay_name_from_nr(overlay_nr + i),
1640                                         unittest_path(unittest_nr + i,
1641                                                 PDEV_OVERLAY));
1642                         return;
1643                 }
1644                 of_unittest_untrack_overlay(ov_id[i]);
1645         }
1646
1647         for (i = 0; i < 2; i++) {
1648                 /* unittest device must be again in before state */
1649                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1650                                 != before) {
1651                         unittest(0, "%s with device @\"%s\" %s\n",
1652                                         overlay_name_from_nr(overlay_nr + i),
1653                                         unittest_path(unittest_nr + i,
1654                                                 PDEV_OVERLAY),
1655                                         !before ? "enabled" : "disabled");
1656                         return;
1657                 }
1658         }
1659
1660         unittest(1, "overlay test %d passed\n", 6);
1661 }
1662
1663 /* test overlay application in sequence */
1664 static void __init of_unittest_overlay_8(void)
1665 {
1666         int i, ov_id[2], ovcs_id;
1667         int overlay_nr = 8, unittest_nr = 8;
1668         const char *overlay_name;
1669
1670         /* we don't care about device state in this test */
1671
1672         /* apply the overlays */
1673         for (i = 0; i < 2; i++) {
1674
1675                 overlay_name = overlay_name_from_nr(overlay_nr + i);
1676
1677                 if (!overlay_data_apply(overlay_name, &ovcs_id)) {
1678                         unittest(0, "could not apply overlay \"%s\"\n",
1679                                         overlay_name);
1680                         return;
1681                 }
1682                 ov_id[i] = ovcs_id;
1683                 of_unittest_track_overlay(ov_id[i]);
1684         }
1685
1686         /* now try to remove first overlay (it should fail) */
1687         ovcs_id = ov_id[0];
1688         if (!of_overlay_remove(&ovcs_id)) {
1689                 unittest(0, "%s was destroyed @\"%s\"\n",
1690                                 overlay_name_from_nr(overlay_nr + 0),
1691                                 unittest_path(unittest_nr,
1692                                         PDEV_OVERLAY));
1693                 return;
1694         }
1695
1696         /* removing them in order should work */
1697         for (i = 1; i >= 0; i--) {
1698                 ovcs_id = ov_id[i];
1699                 if (of_overlay_remove(&ovcs_id)) {
1700                         unittest(0, "%s not destroyed @\"%s\"\n",
1701                                         overlay_name_from_nr(overlay_nr + i),
1702                                         unittest_path(unittest_nr,
1703                                                 PDEV_OVERLAY));
1704                         return;
1705                 }
1706                 of_unittest_untrack_overlay(ov_id[i]);
1707         }
1708
1709         unittest(1, "overlay test %d passed\n", 8);
1710 }
1711
1712 /* test insertion of a bus with parent devices */
1713 static void __init of_unittest_overlay_10(void)
1714 {
1715         int ret;
1716         char *child_path;
1717
1718         /* device should disable */
1719         ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
1720         if (unittest(ret == 0,
1721                         "overlay test %d failed; overlay application\n", 10))
1722                 return;
1723
1724         child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
1725                         unittest_path(10, PDEV_OVERLAY));
1726         if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
1727                 return;
1728
1729         ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
1730         kfree(child_path);
1731
1732         unittest(ret, "overlay test %d failed; no child device\n", 10);
1733 }
1734
1735 /* test insertion of a bus with parent devices (and revert) */
1736 static void __init of_unittest_overlay_11(void)
1737 {
1738         int ret;
1739
1740         /* device should disable */
1741         ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
1742                         PDEV_OVERLAY);
1743         unittest(ret == 0, "overlay test %d failed; overlay apply\n", 11);
1744 }
1745
1746 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
1747
1748 struct unittest_i2c_bus_data {
1749         struct platform_device  *pdev;
1750         struct i2c_adapter      adap;
1751 };
1752
1753 static int unittest_i2c_master_xfer(struct i2c_adapter *adap,
1754                 struct i2c_msg *msgs, int num)
1755 {
1756         struct unittest_i2c_bus_data *std = i2c_get_adapdata(adap);
1757
1758         (void)std;
1759
1760         return num;
1761 }
1762
1763 static u32 unittest_i2c_functionality(struct i2c_adapter *adap)
1764 {
1765         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1766 }
1767
1768 static const struct i2c_algorithm unittest_i2c_algo = {
1769         .master_xfer    = unittest_i2c_master_xfer,
1770         .functionality  = unittest_i2c_functionality,
1771 };
1772
1773 static int unittest_i2c_bus_probe(struct platform_device *pdev)
1774 {
1775         struct device *dev = &pdev->dev;
1776         struct device_node *np = dev->of_node;
1777         struct unittest_i2c_bus_data *std;
1778         struct i2c_adapter *adap;
1779         int ret;
1780
1781         if (np == NULL) {
1782                 dev_err(dev, "No OF data for device\n");
1783                 return -EINVAL;
1784
1785         }
1786
1787         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1788
1789         std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
1790         if (!std) {
1791                 dev_err(dev, "Failed to allocate unittest i2c data\n");
1792                 return -ENOMEM;
1793         }
1794
1795         /* link them together */
1796         std->pdev = pdev;
1797         platform_set_drvdata(pdev, std);
1798
1799         adap = &std->adap;
1800         i2c_set_adapdata(adap, std);
1801         adap->nr = -1;
1802         strlcpy(adap->name, pdev->name, sizeof(adap->name));
1803         adap->class = I2C_CLASS_DEPRECATED;
1804         adap->algo = &unittest_i2c_algo;
1805         adap->dev.parent = dev;
1806         adap->dev.of_node = dev->of_node;
1807         adap->timeout = 5 * HZ;
1808         adap->retries = 3;
1809
1810         ret = i2c_add_numbered_adapter(adap);
1811         if (ret != 0) {
1812                 dev_err(dev, "Failed to add I2C adapter\n");
1813                 return ret;
1814         }
1815
1816         return 0;
1817 }
1818
1819 static int unittest_i2c_bus_remove(struct platform_device *pdev)
1820 {
1821         struct device *dev = &pdev->dev;
1822         struct device_node *np = dev->of_node;
1823         struct unittest_i2c_bus_data *std = platform_get_drvdata(pdev);
1824
1825         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1826         i2c_del_adapter(&std->adap);
1827
1828         return 0;
1829 }
1830
1831 static const struct of_device_id unittest_i2c_bus_match[] = {
1832         { .compatible = "unittest-i2c-bus", },
1833         {},
1834 };
1835
1836 static struct platform_driver unittest_i2c_bus_driver = {
1837         .probe                  = unittest_i2c_bus_probe,
1838         .remove                 = unittest_i2c_bus_remove,
1839         .driver = {
1840                 .name           = "unittest-i2c-bus",
1841                 .of_match_table = of_match_ptr(unittest_i2c_bus_match),
1842         },
1843 };
1844
1845 static int unittest_i2c_dev_probe(struct i2c_client *client,
1846                 const struct i2c_device_id *id)
1847 {
1848         struct device *dev = &client->dev;
1849         struct device_node *np = client->dev.of_node;
1850
1851         if (!np) {
1852                 dev_err(dev, "No OF node\n");
1853                 return -EINVAL;
1854         }
1855
1856         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1857
1858         return 0;
1859 };
1860
1861 static int unittest_i2c_dev_remove(struct i2c_client *client)
1862 {
1863         struct device *dev = &client->dev;
1864         struct device_node *np = client->dev.of_node;
1865
1866         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1867         return 0;
1868 }
1869
1870 static const struct i2c_device_id unittest_i2c_dev_id[] = {
1871         { .name = "unittest-i2c-dev" },
1872         { }
1873 };
1874
1875 static struct i2c_driver unittest_i2c_dev_driver = {
1876         .driver = {
1877                 .name = "unittest-i2c-dev",
1878         },
1879         .probe = unittest_i2c_dev_probe,
1880         .remove = unittest_i2c_dev_remove,
1881         .id_table = unittest_i2c_dev_id,
1882 };
1883
1884 #if IS_BUILTIN(CONFIG_I2C_MUX)
1885
1886 static int unittest_i2c_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
1887 {
1888         return 0;
1889 }
1890
1891 static int unittest_i2c_mux_probe(struct i2c_client *client,
1892                 const struct i2c_device_id *id)
1893 {
1894         int i, nchans;
1895         struct device *dev = &client->dev;
1896         struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
1897         struct device_node *np = client->dev.of_node, *child;
1898         struct i2c_mux_core *muxc;
1899         u32 reg, max_reg;
1900
1901         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1902
1903         if (!np) {
1904                 dev_err(dev, "No OF node\n");
1905                 return -EINVAL;
1906         }
1907
1908         max_reg = (u32)-1;
1909         for_each_child_of_node(np, child) {
1910                 if (of_property_read_u32(child, "reg", &reg))
1911                         continue;
1912                 if (max_reg == (u32)-1 || reg > max_reg)
1913                         max_reg = reg;
1914         }
1915         nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
1916         if (nchans == 0) {
1917                 dev_err(dev, "No channels\n");
1918                 return -EINVAL;
1919         }
1920
1921         muxc = i2c_mux_alloc(adap, dev, nchans, 0, 0,
1922                              unittest_i2c_mux_select_chan, NULL);
1923         if (!muxc)
1924                 return -ENOMEM;
1925         for (i = 0; i < nchans; i++) {
1926                 if (i2c_mux_add_adapter(muxc, 0, i, 0)) {
1927                         dev_err(dev, "Failed to register mux #%d\n", i);
1928                         i2c_mux_del_adapters(muxc);
1929                         return -ENODEV;
1930                 }
1931         }
1932
1933         i2c_set_clientdata(client, muxc);
1934
1935         return 0;
1936 };
1937
1938 static int unittest_i2c_mux_remove(struct i2c_client *client)
1939 {
1940         struct device *dev = &client->dev;
1941         struct device_node *np = client->dev.of_node;
1942         struct i2c_mux_core *muxc = i2c_get_clientdata(client);
1943
1944         dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1945         i2c_mux_del_adapters(muxc);
1946         return 0;
1947 }
1948
1949 static const struct i2c_device_id unittest_i2c_mux_id[] = {
1950         { .name = "unittest-i2c-mux" },
1951         { }
1952 };
1953
1954 static struct i2c_driver unittest_i2c_mux_driver = {
1955         .driver = {
1956                 .name = "unittest-i2c-mux",
1957         },
1958         .probe = unittest_i2c_mux_probe,
1959         .remove = unittest_i2c_mux_remove,
1960         .id_table = unittest_i2c_mux_id,
1961 };
1962
1963 #endif
1964
1965 static int of_unittest_overlay_i2c_init(void)
1966 {
1967         int ret;
1968
1969         ret = i2c_add_driver(&unittest_i2c_dev_driver);
1970         if (unittest(ret == 0,
1971                         "could not register unittest i2c device driver\n"))
1972                 return ret;
1973
1974         ret = platform_driver_register(&unittest_i2c_bus_driver);
1975         if (unittest(ret == 0,
1976                         "could not register unittest i2c bus driver\n"))
1977                 return ret;
1978
1979 #if IS_BUILTIN(CONFIG_I2C_MUX)
1980         ret = i2c_add_driver(&unittest_i2c_mux_driver);
1981         if (unittest(ret == 0,
1982                         "could not register unittest i2c mux driver\n"))
1983                 return ret;
1984 #endif
1985
1986         return 0;
1987 }
1988
1989 static void of_unittest_overlay_i2c_cleanup(void)
1990 {
1991 #if IS_BUILTIN(CONFIG_I2C_MUX)
1992         i2c_del_driver(&unittest_i2c_mux_driver);
1993 #endif
1994         platform_driver_unregister(&unittest_i2c_bus_driver);
1995         i2c_del_driver(&unittest_i2c_dev_driver);
1996 }
1997
1998 static void __init of_unittest_overlay_i2c_12(void)
1999 {
2000         /* device should enable */
2001         if (of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY))
2002                 return;
2003
2004         unittest(1, "overlay test %d passed\n", 12);
2005 }
2006
2007 /* test deactivation of device */
2008 static void __init of_unittest_overlay_i2c_13(void)
2009 {
2010         /* device should disable */
2011         if (of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY))
2012                 return;
2013
2014         unittest(1, "overlay test %d passed\n", 13);
2015 }
2016
2017 /* just check for i2c mux existence */
2018 static void of_unittest_overlay_i2c_14(void)
2019 {
2020 }
2021
2022 static void __init of_unittest_overlay_i2c_15(void)
2023 {
2024         /* device should enable */
2025         if (of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY))
2026                 return;
2027
2028         unittest(1, "overlay test %d passed\n", 15);
2029 }
2030
2031 #else
2032
2033 static inline void of_unittest_overlay_i2c_14(void) { }
2034 static inline void of_unittest_overlay_i2c_15(void) { }
2035
2036 #endif
2037
2038 static void __init of_unittest_overlay(void)
2039 {
2040         struct device_node *bus_np = NULL;
2041
2042         if (platform_driver_register(&unittest_driver)) {
2043                 unittest(0, "could not register unittest driver\n");
2044                 goto out;
2045         }
2046
2047         bus_np = of_find_node_by_path(bus_path);
2048         if (bus_np == NULL) {
2049                 unittest(0, "could not find bus_path \"%s\"\n", bus_path);
2050                 goto out;
2051         }
2052
2053         if (of_platform_default_populate(bus_np, NULL, NULL)) {
2054                 unittest(0, "could not populate bus @ \"%s\"\n", bus_path);
2055                 goto out;
2056         }
2057
2058         if (!of_unittest_device_exists(100, PDEV_OVERLAY)) {
2059                 unittest(0, "could not find unittest0 @ \"%s\"\n",
2060                                 unittest_path(100, PDEV_OVERLAY));
2061                 goto out;
2062         }
2063
2064         if (of_unittest_device_exists(101, PDEV_OVERLAY)) {
2065                 unittest(0, "unittest1 @ \"%s\" should not exist\n",
2066                                 unittest_path(101, PDEV_OVERLAY));
2067                 goto out;
2068         }
2069
2070         unittest(1, "basic infrastructure of overlays passed");
2071
2072         /* tests in sequence */
2073         of_unittest_overlay_0();
2074         of_unittest_overlay_1();
2075         of_unittest_overlay_2();
2076         of_unittest_overlay_3();
2077         of_unittest_overlay_4();
2078         of_unittest_overlay_5();
2079         of_unittest_overlay_6();
2080         of_unittest_overlay_8();
2081
2082         of_unittest_overlay_10();
2083         of_unittest_overlay_11();
2084
2085 #if IS_BUILTIN(CONFIG_I2C)
2086         if (unittest(of_unittest_overlay_i2c_init() == 0, "i2c init failed\n"))
2087                 goto out;
2088
2089         of_unittest_overlay_i2c_12();
2090         of_unittest_overlay_i2c_13();
2091         of_unittest_overlay_i2c_14();
2092         of_unittest_overlay_i2c_15();
2093
2094         of_unittest_overlay_i2c_cleanup();
2095 #endif
2096
2097         of_unittest_destroy_tracked_overlays();
2098
2099 out:
2100         of_node_put(bus_np);
2101 }
2102
2103 #else
2104 static inline void __init of_unittest_overlay(void) { }
2105 #endif
2106
2107 #ifdef CONFIG_OF_OVERLAY
2108
2109 /*
2110  * __dtb_ot_begin[] and __dtb_ot_end[] are created by cmd_dt_S_dtb
2111  * in scripts/Makefile.lib
2112  */
2113
2114 #define OVERLAY_INFO_EXTERN(name) \
2115         extern uint8_t __dtb_##name##_begin[]; \
2116         extern uint8_t __dtb_##name##_end[]
2117
2118 #define OVERLAY_INFO(overlay_name, expected)             \
2119 {       .dtb_begin       = __dtb_##overlay_name##_begin, \
2120         .dtb_end         = __dtb_##overlay_name##_end,   \
2121         .expected_result = expected,                     \
2122         .name            = #overlay_name,                \
2123 }
2124
2125 struct overlay_info {
2126         uint8_t         *dtb_begin;
2127         uint8_t         *dtb_end;
2128         int             expected_result;
2129         int             overlay_id;
2130         char            *name;
2131 };
2132
2133 OVERLAY_INFO_EXTERN(overlay_base);
2134 OVERLAY_INFO_EXTERN(overlay);
2135 OVERLAY_INFO_EXTERN(overlay_0);
2136 OVERLAY_INFO_EXTERN(overlay_1);
2137 OVERLAY_INFO_EXTERN(overlay_2);
2138 OVERLAY_INFO_EXTERN(overlay_3);
2139 OVERLAY_INFO_EXTERN(overlay_4);
2140 OVERLAY_INFO_EXTERN(overlay_5);
2141 OVERLAY_INFO_EXTERN(overlay_6);
2142 OVERLAY_INFO_EXTERN(overlay_7);
2143 OVERLAY_INFO_EXTERN(overlay_8);
2144 OVERLAY_INFO_EXTERN(overlay_9);
2145 OVERLAY_INFO_EXTERN(overlay_10);
2146 OVERLAY_INFO_EXTERN(overlay_11);
2147 OVERLAY_INFO_EXTERN(overlay_12);
2148 OVERLAY_INFO_EXTERN(overlay_13);
2149 OVERLAY_INFO_EXTERN(overlay_15);
2150 OVERLAY_INFO_EXTERN(overlay_bad_phandle);
2151 OVERLAY_INFO_EXTERN(overlay_bad_symbol);
2152
2153 /* order of entries is hard-coded into users of overlays[] */
2154 static struct overlay_info overlays[] = {
2155         OVERLAY_INFO(overlay_base, -9999),
2156         OVERLAY_INFO(overlay, 0),
2157         OVERLAY_INFO(overlay_0, 0),
2158         OVERLAY_INFO(overlay_1, 0),
2159         OVERLAY_INFO(overlay_2, 0),
2160         OVERLAY_INFO(overlay_3, 0),
2161         OVERLAY_INFO(overlay_4, 0),
2162         OVERLAY_INFO(overlay_5, 0),
2163         OVERLAY_INFO(overlay_6, 0),
2164         OVERLAY_INFO(overlay_7, 0),
2165         OVERLAY_INFO(overlay_8, 0),
2166         OVERLAY_INFO(overlay_9, 0),
2167         OVERLAY_INFO(overlay_10, 0),
2168         OVERLAY_INFO(overlay_11, 0),
2169         OVERLAY_INFO(overlay_12, 0),
2170         OVERLAY_INFO(overlay_13, 0),
2171         OVERLAY_INFO(overlay_15, 0),
2172         OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
2173         OVERLAY_INFO(overlay_bad_symbol, -EINVAL),
2174         {}
2175 };
2176
2177 static struct device_node *overlay_base_root;
2178
2179 static void * __init dt_alloc_memory(u64 size, u64 align)
2180 {
2181         return memblock_virt_alloc(size, align);
2182 }
2183
2184 /*
2185  * Create base device tree for the overlay unittest.
2186  *
2187  * This is called from very early boot code.
2188  *
2189  * Do as much as possible the same way as done in __unflatten_device_tree
2190  * and other early boot steps for the normal FDT so that the overlay base
2191  * unflattened tree will have the same characteristics as the real tree
2192  * (such as having memory allocated by the early allocator).  The goal
2193  * is to test "the real thing" as much as possible, and test "test setup
2194  * code" as little as possible.
2195  *
2196  * Have to stop before resolving phandles, because that uses kmalloc.
2197  */
2198 void __init unittest_unflatten_overlay_base(void)
2199 {
2200         struct overlay_info *info;
2201         u32 data_size;
2202         void *new_fdt;
2203         u32 size;
2204
2205         info = &overlays[0];
2206
2207         if (info->expected_result != -9999) {
2208                 pr_err("No dtb 'overlay_base' to attach\n");
2209                 return;
2210         }
2211
2212         data_size = info->dtb_end - info->dtb_begin;
2213         if (!data_size) {
2214                 pr_err("No dtb 'overlay_base' to attach\n");
2215                 return;
2216         }
2217
2218         size = fdt_totalsize(info->dtb_begin);
2219         if (size != data_size) {
2220                 pr_err("dtb 'overlay_base' header totalsize != actual size");
2221                 return;
2222         }
2223
2224         new_fdt = dt_alloc_memory(size, roundup_pow_of_two(FDT_V17_SIZE));
2225         if (!new_fdt) {
2226                 pr_err("alloc for dtb 'overlay_base' failed");
2227                 return;
2228         }
2229
2230         memcpy(new_fdt, info->dtb_begin, size);
2231
2232         __unflatten_device_tree(new_fdt, NULL, &overlay_base_root,
2233                                 dt_alloc_memory, true);
2234 }
2235
2236 /*
2237  * The purpose of of_unittest_overlay_data_add is to add an
2238  * overlay in the normal fashion.  This is a test of the whole
2239  * picture, instead of testing individual elements.
2240  *
2241  * A secondary purpose is to be able to verify that the contents of
2242  * /proc/device-tree/ contains the updated structure and values from
2243  * the overlay.  That must be verified separately in user space.
2244  *
2245  * Return 0 on unexpected error.
2246  */
2247 static int __init overlay_data_apply(const char *overlay_name, int *overlay_id)
2248 {
2249         struct overlay_info *info;
2250         int found = 0;
2251         int k;
2252         int ret;
2253         u32 size;
2254
2255         for (k = 0, info = overlays; info && info->name; info++, k++) {
2256                 if (!strcmp(overlay_name, info->name)) {
2257                         found = 1;
2258                         break;
2259                 }
2260         }
2261         if (!found) {
2262                 pr_err("no overlay data for %s\n", overlay_name);
2263                 return 0;
2264         }
2265
2266         size = info->dtb_end - info->dtb_begin;
2267         if (!size)
2268                 pr_err("no overlay data for %s\n", overlay_name);
2269
2270         ret = of_overlay_fdt_apply(info->dtb_begin, size, &info->overlay_id);
2271         if (overlay_id)
2272                 *overlay_id = info->overlay_id;
2273         if (ret < 0)
2274                 goto out;
2275
2276         pr_debug("%s applied\n", overlay_name);
2277
2278 out:
2279         if (ret != info->expected_result)
2280                 pr_err("of_overlay_fdt_apply() expected %d, ret=%d, %s\n",
2281                        info->expected_result, ret, overlay_name);
2282
2283         return (ret == info->expected_result);
2284 }
2285
2286 /*
2287  * The purpose of of_unittest_overlay_high_level is to add an overlay
2288  * in the normal fashion.  This is a test of the whole picture,
2289  * instead of individual elements.
2290  *
2291  * The first part of the function is _not_ normal overlay usage; it is
2292  * finishing splicing the base overlay device tree into the live tree.
2293  */
2294 static __init void of_unittest_overlay_high_level(void)
2295 {
2296         struct device_node *last_sibling;
2297         struct device_node *np;
2298         struct device_node *of_symbols;
2299         struct device_node *overlay_base_symbols;
2300         struct device_node **pprev;
2301         struct property *prop;
2302
2303         if (!overlay_base_root) {
2304                 unittest(0, "overlay_base_root not initialized\n");
2305                 return;
2306         }
2307
2308         /*
2309          * Could not fixup phandles in unittest_unflatten_overlay_base()
2310          * because kmalloc() was not yet available.
2311          */
2312         of_overlay_mutex_lock();
2313         of_resolve_phandles(overlay_base_root);
2314         of_overlay_mutex_unlock();
2315
2316
2317         /*
2318          * do not allow overlay_base to duplicate any node already in
2319          * tree, this greatly simplifies the code
2320          */
2321
2322         /*
2323          * remove overlay_base_root node "__local_fixups", after
2324          * being used by of_resolve_phandles()
2325          */
2326         pprev = &overlay_base_root->child;
2327         for (np = overlay_base_root->child; np; np = np->sibling) {
2328                 if (!of_node_cmp(np->name, "__local_fixups__")) {
2329                         *pprev = np->sibling;
2330                         break;
2331                 }
2332                 pprev = &np->sibling;
2333         }
2334
2335         /* remove overlay_base_root node "__symbols__" if in live tree */
2336         of_symbols = of_get_child_by_name(of_root, "__symbols__");
2337         if (of_symbols) {
2338                 /* will have to graft properties from node into live tree */
2339                 pprev = &overlay_base_root->child;
2340                 for (np = overlay_base_root->child; np; np = np->sibling) {
2341                         if (!of_node_cmp(np->name, "__symbols__")) {
2342                                 overlay_base_symbols = np;
2343                                 *pprev = np->sibling;
2344                                 break;
2345                         }
2346                         pprev = &np->sibling;
2347                 }
2348         }
2349
2350         for (np = overlay_base_root->child; np; np = np->sibling) {
2351                 if (of_get_child_by_name(of_root, np->name)) {
2352                         unittest(0, "illegal node name in overlay_base %s",
2353                                 np->name);
2354                         return;
2355                 }
2356         }
2357
2358         /*
2359          * overlay 'overlay_base' is not allowed to have root
2360          * properties, so only need to splice nodes into main device tree.
2361          *
2362          * root node of *overlay_base_root will not be freed, it is lost
2363          * memory.
2364          */
2365
2366         for (np = overlay_base_root->child; np; np = np->sibling)
2367                 np->parent = of_root;
2368
2369         mutex_lock(&of_mutex);
2370
2371         for (last_sibling = np = of_root->child; np; np = np->sibling)
2372                 last_sibling = np;
2373
2374         if (last_sibling)
2375                 last_sibling->sibling = overlay_base_root->child;
2376         else
2377                 of_root->child = overlay_base_root->child;
2378
2379         for_each_of_allnodes_from(overlay_base_root, np)
2380                 __of_attach_node_sysfs(np);
2381
2382         if (of_symbols) {
2383                 struct property *new_prop;
2384                 for_each_property_of_node(overlay_base_symbols, prop) {
2385
2386                         new_prop = __of_prop_dup(prop, GFP_KERNEL);
2387                         if (!new_prop) {
2388                                 unittest(0, "__of_prop_dup() of '%s' from overlay_base node __symbols__",
2389                                          prop->name);
2390                                 goto err_unlock;
2391                         }
2392                         if (__of_add_property(of_symbols, new_prop)) {
2393                                 /* "name" auto-generated by unflatten */
2394                                 if (!strcmp(new_prop->name, "name"))
2395                                         continue;
2396                                 unittest(0, "duplicate property '%s' in overlay_base node __symbols__",
2397                                          prop->name);
2398                                 goto err_unlock;
2399                         }
2400                         if (__of_add_property_sysfs(of_symbols, new_prop)) {
2401                                 unittest(0, "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
2402                                          prop->name);
2403                                 goto err_unlock;
2404                         }
2405                 }
2406         }
2407
2408         mutex_unlock(&of_mutex);
2409
2410
2411         /* now do the normal overlay usage test */
2412
2413         unittest(overlay_data_apply("overlay", NULL),
2414                  "Adding overlay 'overlay' failed\n");
2415
2416         unittest(overlay_data_apply("overlay_bad_phandle", NULL),
2417                  "Adding overlay 'overlay_bad_phandle' failed\n");
2418
2419         unittest(overlay_data_apply("overlay_bad_symbol", NULL),
2420                  "Adding overlay 'overlay_bad_symbol' failed\n");
2421
2422         return;
2423
2424 err_unlock:
2425         mutex_unlock(&of_mutex);
2426 }
2427
2428 #else
2429
2430 static inline __init void of_unittest_overlay_high_level(void) {}
2431
2432 #endif
2433
2434 static int __init of_unittest(void)
2435 {
2436         struct device_node *np;
2437         int res;
2438
2439         /* adding data for unittest */
2440         res = unittest_data_add();
2441         if (res)
2442                 return res;
2443         if (!of_aliases)
2444                 of_aliases = of_find_node_by_path("/aliases");
2445
2446         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
2447         if (!np) {
2448                 pr_info("No testcase data in device tree; not running tests\n");
2449                 return 0;
2450         }
2451         of_node_put(np);
2452
2453         pr_info("start of unittest - you will see error messages\n");
2454         of_unittest_check_tree_linkage();
2455         of_unittest_check_phandles();
2456         of_unittest_find_node_by_name();
2457         of_unittest_dynamic();
2458         of_unittest_parse_phandle_with_args();
2459         of_unittest_parse_phandle_with_args_map();
2460         of_unittest_printf();
2461         of_unittest_property_string();
2462         of_unittest_property_copy();
2463         of_unittest_changeset();
2464         of_unittest_parse_interrupts();
2465         of_unittest_parse_interrupts_extended();
2466         of_unittest_match_node();
2467         of_unittest_platform_populate();
2468         of_unittest_overlay();
2469
2470         /* Double check linkage after removing testcase data */
2471         of_unittest_check_tree_linkage();
2472
2473         of_unittest_overlay_high_level();
2474
2475         pr_info("end of unittest - %i passed, %i failed\n",
2476                 unittest_results.passed, unittest_results.failed);
2477
2478         return 0;
2479 }
2480 late_initcall(of_unittest);