Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/of/selftest.c

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

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