xref: /linux/drivers/of/unittest.c (revision 2363088eba2ecccfb643725e4864af73c4226a04)
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/memblock.h>
9 #include <linux/clk.h>
10 #include <linux/dma-direct.h> /* to test phys_to_dma/dma_to_phys */
11 #include <linux/err.h>
12 #include <linux/errno.h>
13 #include <linux/hashtable.h>
14 #include <linux/libfdt.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17 #include <linux/of_fdt.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_platform.h>
20 #include <linux/list.h>
21 #include <linux/mutex.h>
22 #include <linux/slab.h>
23 #include <linux/device.h>
24 #include <linux/platform_device.h>
25 #include <linux/kernel.h>
26 
27 #include <linux/i2c.h>
28 #include <linux/i2c-mux.h>
29 #include <linux/gpio/driver.h>
30 
31 #include <linux/bitops.h>
32 
33 #include "of_private.h"
34 
35 static struct unittest_results {
36 	int passed;
37 	int failed;
38 } unittest_results;
39 
40 #define unittest(result, fmt, ...) ({ \
41 	bool failed = !(result); \
42 	if (failed) { \
43 		unittest_results.failed++; \
44 		pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
45 	} else { \
46 		unittest_results.passed++; \
47 		pr_info("pass %s():%i\n", __func__, __LINE__); \
48 	} \
49 	failed; \
50 })
51 
52 /*
53  * Expected message may have a message level other than KERN_INFO.
54  * Print the expected message only if the current loglevel will allow
55  * the actual message to print.
56  *
57  * Do not use EXPECT_BEGIN(), EXPECT_END(), EXPECT_NOT_BEGIN(), or
58  * EXPECT_NOT_END() to report messages expected to be reported or not
59  * reported by pr_debug().
60  */
61 #define EXPECT_BEGIN(level, fmt, ...) \
62 	printk(level pr_fmt("EXPECT \\ : ") fmt, ##__VA_ARGS__)
63 
64 #define EXPECT_END(level, fmt, ...) \
65 	printk(level pr_fmt("EXPECT / : ") fmt, ##__VA_ARGS__)
66 
67 #define EXPECT_NOT_BEGIN(level, fmt, ...) \
68 	printk(level pr_fmt("EXPECT_NOT \\ : ") fmt, ##__VA_ARGS__)
69 
70 #define EXPECT_NOT_END(level, fmt, ...) \
71 	printk(level pr_fmt("EXPECT_NOT / : ") fmt, ##__VA_ARGS__)
72 
73 static void __init of_unittest_find_node_by_name(void)
74 {
75 	struct device_node *np;
76 	const char *options, *name;
77 
78 	np = of_find_node_by_path("/testcase-data");
79 	name = kasprintf(GFP_KERNEL, "%pOF", np);
80 	unittest(np && !strcmp("/testcase-data", name),
81 		"find /testcase-data failed\n");
82 	of_node_put(np);
83 	kfree(name);
84 
85 	/* Test if trailing '/' works */
86 	np = of_find_node_by_path("/testcase-data/");
87 	unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
88 
89 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
90 	name = kasprintf(GFP_KERNEL, "%pOF", np);
91 	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
92 		"find /testcase-data/phandle-tests/consumer-a failed\n");
93 	of_node_put(np);
94 	kfree(name);
95 
96 	np = of_find_node_by_path("testcase-alias");
97 	name = kasprintf(GFP_KERNEL, "%pOF", np);
98 	unittest(np && !strcmp("/testcase-data", name),
99 		"find testcase-alias failed\n");
100 	of_node_put(np);
101 	kfree(name);
102 
103 	/* Test if trailing '/' works on aliases */
104 	np = of_find_node_by_path("testcase-alias/");
105 	unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
106 
107 	np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
108 	name = kasprintf(GFP_KERNEL, "%pOF", np);
109 	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
110 		"find testcase-alias/phandle-tests/consumer-a failed\n");
111 	of_node_put(np);
112 	kfree(name);
113 
114 	np = of_find_node_by_path("/testcase-data/missing-path");
115 	unittest(!np, "non-existent path returned node %pOF\n", np);
116 	of_node_put(np);
117 
118 	np = of_find_node_by_path("missing-alias");
119 	unittest(!np, "non-existent alias returned node %pOF\n", np);
120 	of_node_put(np);
121 
122 	np = of_find_node_by_path("testcase-alias/missing-path");
123 	unittest(!np, "non-existent alias with relative path returned node %pOF\n", np);
124 	of_node_put(np);
125 
126 	np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
127 	unittest(np && !strcmp("testoption", options),
128 		 "option path test failed\n");
129 	of_node_put(np);
130 
131 	np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
132 	unittest(np && !strcmp("test/option", options),
133 		 "option path test, subcase #1 failed\n");
134 	of_node_put(np);
135 
136 	np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
137 	unittest(np && !strcmp("test/option", options),
138 		 "option path test, subcase #2 failed\n");
139 	of_node_put(np);
140 
141 	np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
142 	unittest(np, "NULL option path test failed\n");
143 	of_node_put(np);
144 
145 	np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
146 				       &options);
147 	unittest(np && !strcmp("testaliasoption", options),
148 		 "option alias path test failed\n");
149 	of_node_put(np);
150 
151 	np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
152 				       &options);
153 	unittest(np && !strcmp("test/alias/option", options),
154 		 "option alias path test, subcase #1 failed\n");
155 	of_node_put(np);
156 
157 	np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
158 	unittest(np, "NULL option alias path test failed\n");
159 	of_node_put(np);
160 
161 	options = "testoption";
162 	np = of_find_node_opts_by_path("testcase-alias", &options);
163 	unittest(np && !options, "option clearing test failed\n");
164 	of_node_put(np);
165 
166 	options = "testoption";
167 	np = of_find_node_opts_by_path("/", &options);
168 	unittest(np && !options, "option clearing root node test failed\n");
169 	of_node_put(np);
170 }
171 
172 static void __init of_unittest_dynamic(void)
173 {
174 	struct device_node *np;
175 	struct property *prop;
176 
177 	np = of_find_node_by_path("/testcase-data");
178 	if (!np) {
179 		pr_err("missing testcase data\n");
180 		return;
181 	}
182 
183 	/* Array of 4 properties for the purpose of testing */
184 	prop = kcalloc(4, sizeof(*prop), GFP_KERNEL);
185 	if (!prop) {
186 		unittest(0, "kzalloc() failed\n");
187 		return;
188 	}
189 
190 	/* Add a new property - should pass*/
191 	prop->name = "new-property";
192 	prop->value = "new-property-data";
193 	prop->length = strlen(prop->value) + 1;
194 	unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
195 
196 	/* Try to add an existing property - should fail */
197 	prop++;
198 	prop->name = "new-property";
199 	prop->value = "new-property-data-should-fail";
200 	prop->length = strlen(prop->value) + 1;
201 	unittest(of_add_property(np, prop) != 0,
202 		 "Adding an existing property should have failed\n");
203 
204 	/* Try to modify an existing property - should pass */
205 	prop->value = "modify-property-data-should-pass";
206 	prop->length = strlen(prop->value) + 1;
207 	unittest(of_update_property(np, prop) == 0,
208 		 "Updating an existing property should have passed\n");
209 
210 	/* Try to modify non-existent property - should pass*/
211 	prop++;
212 	prop->name = "modify-property";
213 	prop->value = "modify-missing-property-data-should-pass";
214 	prop->length = strlen(prop->value) + 1;
215 	unittest(of_update_property(np, prop) == 0,
216 		 "Updating a missing property should have passed\n");
217 
218 	/* Remove property - should pass */
219 	unittest(of_remove_property(np, prop) == 0,
220 		 "Removing a property should have passed\n");
221 
222 	/* Adding very large property - should pass */
223 	prop++;
224 	prop->name = "large-property-PAGE_SIZEx8";
225 	prop->length = PAGE_SIZE * 8;
226 	prop->value = kzalloc(prop->length, GFP_KERNEL);
227 	unittest(prop->value != NULL, "Unable to allocate large buffer\n");
228 	if (prop->value)
229 		unittest(of_add_property(np, prop) == 0,
230 			 "Adding a large property should have passed\n");
231 }
232 
233 static int __init of_unittest_check_node_linkage(struct device_node *np)
234 {
235 	struct device_node *child;
236 	int count = 0, rc;
237 
238 	for_each_child_of_node(np, child) {
239 		if (child->parent != np) {
240 			pr_err("Child node %pOFn links to wrong parent %pOFn\n",
241 				 child, np);
242 			rc = -EINVAL;
243 			goto put_child;
244 		}
245 
246 		rc = of_unittest_check_node_linkage(child);
247 		if (rc < 0)
248 			goto put_child;
249 		count += rc;
250 	}
251 
252 	return count + 1;
253 put_child:
254 	of_node_put(child);
255 	return rc;
256 }
257 
258 static void __init of_unittest_check_tree_linkage(void)
259 {
260 	struct device_node *np;
261 	int allnode_count = 0, child_count;
262 
263 	if (!of_root)
264 		return;
265 
266 	for_each_of_allnodes(np)
267 		allnode_count++;
268 	child_count = of_unittest_check_node_linkage(of_root);
269 
270 	unittest(child_count > 0, "Device node data structure is corrupted\n");
271 	unittest(child_count == allnode_count,
272 		 "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
273 		 allnode_count, child_count);
274 	pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
275 }
276 
277 static void __init of_unittest_printf_one(struct device_node *np, const char *fmt,
278 					  const char *expected)
279 {
280 	unsigned char *buf;
281 	int buf_size;
282 	int size, i;
283 
284 	buf_size = strlen(expected) + 10;
285 	buf = kmalloc(buf_size, GFP_KERNEL);
286 	if (!buf)
287 		return;
288 
289 	/* Baseline; check conversion with a large size limit */
290 	memset(buf, 0xff, buf_size);
291 	size = snprintf(buf, buf_size - 2, fmt, np);
292 
293 	/* use strcmp() instead of strncmp() here to be absolutely sure strings match */
294 	unittest((strcmp(buf, expected) == 0) && (buf[size+1] == 0xff),
295 		"sprintf failed; fmt='%s' expected='%s' rslt='%s'\n",
296 		fmt, expected, buf);
297 
298 	/* Make sure length limits work */
299 	size++;
300 	for (i = 0; i < 2; i++, size--) {
301 		/* Clear the buffer, and make sure it works correctly still */
302 		memset(buf, 0xff, buf_size);
303 		snprintf(buf, size+1, fmt, np);
304 		unittest(strncmp(buf, expected, size) == 0 && (buf[size+1] == 0xff),
305 			"snprintf failed; size=%i fmt='%s' expected='%s' rslt='%s'\n",
306 			size, fmt, expected, buf);
307 	}
308 	kfree(buf);
309 }
310 
311 static void __init of_unittest_printf(void)
312 {
313 	struct device_node *np;
314 	const char *full_name = "/testcase-data/platform-tests/test-device@1/dev@100";
315 	char phandle_str[16] = "";
316 
317 	np = of_find_node_by_path(full_name);
318 	if (!np) {
319 		unittest(np, "testcase data missing\n");
320 		return;
321 	}
322 
323 	num_to_str(phandle_str, sizeof(phandle_str), np->phandle, 0);
324 
325 	of_unittest_printf_one(np, "%pOF",  full_name);
326 	of_unittest_printf_one(np, "%pOFf", full_name);
327 	of_unittest_printf_one(np, "%pOFn", "dev");
328 	of_unittest_printf_one(np, "%2pOFn", "dev");
329 	of_unittest_printf_one(np, "%5pOFn", "  dev");
330 	of_unittest_printf_one(np, "%pOFnc", "dev:test-sub-device");
331 	of_unittest_printf_one(np, "%pOFp", phandle_str);
332 	of_unittest_printf_one(np, "%pOFP", "dev@100");
333 	of_unittest_printf_one(np, "ABC %pOFP ABC", "ABC dev@100 ABC");
334 	of_unittest_printf_one(np, "%10pOFP", "   dev@100");
335 	of_unittest_printf_one(np, "%-10pOFP", "dev@100   ");
336 	of_unittest_printf_one(of_root, "%pOFP", "/");
337 	of_unittest_printf_one(np, "%pOFF", "----");
338 	of_unittest_printf_one(np, "%pOFPF", "dev@100:----");
339 	of_unittest_printf_one(np, "%pOFPFPc", "dev@100:----:dev@100:test-sub-device");
340 	of_unittest_printf_one(np, "%pOFc", "test-sub-device");
341 	of_unittest_printf_one(np, "%pOFC",
342 			"\"test-sub-device\",\"test-compat2\",\"test-compat3\"");
343 }
344 
345 struct node_hash {
346 	struct hlist_node node;
347 	struct device_node *np;
348 };
349 
350 static DEFINE_HASHTABLE(phandle_ht, 8);
351 static void __init of_unittest_check_phandles(void)
352 {
353 	struct device_node *np;
354 	struct node_hash *nh;
355 	struct hlist_node *tmp;
356 	int i, dup_count = 0, phandle_count = 0;
357 
358 	for_each_of_allnodes(np) {
359 		if (!np->phandle)
360 			continue;
361 
362 		hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
363 			if (nh->np->phandle == np->phandle) {
364 				pr_info("Duplicate phandle! %i used by %pOF and %pOF\n",
365 					np->phandle, nh->np, np);
366 				dup_count++;
367 				break;
368 			}
369 		}
370 
371 		nh = kzalloc(sizeof(*nh), GFP_KERNEL);
372 		if (!nh)
373 			return;
374 
375 		nh->np = np;
376 		hash_add(phandle_ht, &nh->node, np->phandle);
377 		phandle_count++;
378 	}
379 	unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
380 		 dup_count, phandle_count);
381 
382 	/* Clean up */
383 	hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
384 		hash_del(&nh->node);
385 		kfree(nh);
386 	}
387 }
388 
389 static void __init of_unittest_parse_phandle_with_args(void)
390 {
391 	struct device_node *np;
392 	struct of_phandle_args args;
393 	int i, rc;
394 
395 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
396 	if (!np) {
397 		pr_err("missing testcase data\n");
398 		return;
399 	}
400 
401 	rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
402 	unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
403 
404 	for (i = 0; i < 8; i++) {
405 		bool passed = true;
406 
407 		memset(&args, 0, sizeof(args));
408 		rc = of_parse_phandle_with_args(np, "phandle-list",
409 						"#phandle-cells", i, &args);
410 
411 		/* Test the values from tests-phandle.dtsi */
412 		switch (i) {
413 		case 0:
414 			passed &= !rc;
415 			passed &= (args.args_count == 1);
416 			passed &= (args.args[0] == (i + 1));
417 			break;
418 		case 1:
419 			passed &= !rc;
420 			passed &= (args.args_count == 2);
421 			passed &= (args.args[0] == (i + 1));
422 			passed &= (args.args[1] == 0);
423 			break;
424 		case 2:
425 			passed &= (rc == -ENOENT);
426 			break;
427 		case 3:
428 			passed &= !rc;
429 			passed &= (args.args_count == 3);
430 			passed &= (args.args[0] == (i + 1));
431 			passed &= (args.args[1] == 4);
432 			passed &= (args.args[2] == 3);
433 			break;
434 		case 4:
435 			passed &= !rc;
436 			passed &= (args.args_count == 2);
437 			passed &= (args.args[0] == (i + 1));
438 			passed &= (args.args[1] == 100);
439 			break;
440 		case 5:
441 			passed &= !rc;
442 			passed &= (args.args_count == 0);
443 			break;
444 		case 6:
445 			passed &= !rc;
446 			passed &= (args.args_count == 1);
447 			passed &= (args.args[0] == (i + 1));
448 			break;
449 		case 7:
450 			passed &= (rc == -ENOENT);
451 			break;
452 		default:
453 			passed = false;
454 		}
455 
456 		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
457 			 i, args.np, rc);
458 	}
459 
460 	/* Check for missing list property */
461 	memset(&args, 0, sizeof(args));
462 	rc = of_parse_phandle_with_args(np, "phandle-list-missing",
463 					"#phandle-cells", 0, &args);
464 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
465 	rc = of_count_phandle_with_args(np, "phandle-list-missing",
466 					"#phandle-cells");
467 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
468 
469 	/* Check for missing cells property */
470 	memset(&args, 0, sizeof(args));
471 
472 	EXPECT_BEGIN(KERN_INFO,
473 		     "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
474 
475 	rc = of_parse_phandle_with_args(np, "phandle-list",
476 					"#phandle-cells-missing", 0, &args);
477 
478 	EXPECT_END(KERN_INFO,
479 		   "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
480 
481 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
482 
483 	EXPECT_BEGIN(KERN_INFO,
484 		     "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
485 
486 	rc = of_count_phandle_with_args(np, "phandle-list",
487 					"#phandle-cells-missing");
488 
489 	EXPECT_END(KERN_INFO,
490 		   "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
491 
492 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
493 
494 	/* Check for bad phandle in list */
495 	memset(&args, 0, sizeof(args));
496 
497 	EXPECT_BEGIN(KERN_INFO,
498 		     "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
499 
500 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
501 					"#phandle-cells", 0, &args);
502 
503 	EXPECT_END(KERN_INFO,
504 		   "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
505 
506 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
507 
508 	EXPECT_BEGIN(KERN_INFO,
509 		     "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
510 
511 	rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
512 					"#phandle-cells");
513 
514 	EXPECT_END(KERN_INFO,
515 		   "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
516 
517 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
518 
519 	/* Check for incorrectly formed argument list */
520 	memset(&args, 0, sizeof(args));
521 
522 	EXPECT_BEGIN(KERN_INFO,
523 		     "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found 1");
524 
525 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
526 					"#phandle-cells", 1, &args);
527 
528 	EXPECT_END(KERN_INFO,
529 		   "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found 1");
530 
531 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
532 
533 	EXPECT_BEGIN(KERN_INFO,
534 		     "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found 1");
535 
536 	rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
537 					"#phandle-cells");
538 
539 	EXPECT_END(KERN_INFO,
540 		   "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found 1");
541 
542 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
543 }
544 
545 static void __init of_unittest_parse_phandle_with_args_map(void)
546 {
547 	struct device_node *np, *p0, *p1, *p2, *p3;
548 	struct of_phandle_args args;
549 	int i, rc;
550 
551 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-b");
552 	if (!np) {
553 		pr_err("missing testcase data\n");
554 		return;
555 	}
556 
557 	p0 = of_find_node_by_path("/testcase-data/phandle-tests/provider0");
558 	if (!p0) {
559 		pr_err("missing testcase data\n");
560 		return;
561 	}
562 
563 	p1 = of_find_node_by_path("/testcase-data/phandle-tests/provider1");
564 	if (!p1) {
565 		pr_err("missing testcase data\n");
566 		return;
567 	}
568 
569 	p2 = of_find_node_by_path("/testcase-data/phandle-tests/provider2");
570 	if (!p2) {
571 		pr_err("missing testcase data\n");
572 		return;
573 	}
574 
575 	p3 = of_find_node_by_path("/testcase-data/phandle-tests/provider3");
576 	if (!p3) {
577 		pr_err("missing testcase data\n");
578 		return;
579 	}
580 
581 	rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
582 	unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
583 
584 	for (i = 0; i < 8; i++) {
585 		bool passed = true;
586 
587 		memset(&args, 0, sizeof(args));
588 		rc = of_parse_phandle_with_args_map(np, "phandle-list",
589 						    "phandle", i, &args);
590 
591 		/* Test the values from tests-phandle.dtsi */
592 		switch (i) {
593 		case 0:
594 			passed &= !rc;
595 			passed &= (args.np == p1);
596 			passed &= (args.args_count == 1);
597 			passed &= (args.args[0] == 1);
598 			break;
599 		case 1:
600 			passed &= !rc;
601 			passed &= (args.np == p3);
602 			passed &= (args.args_count == 3);
603 			passed &= (args.args[0] == 2);
604 			passed &= (args.args[1] == 5);
605 			passed &= (args.args[2] == 3);
606 			break;
607 		case 2:
608 			passed &= (rc == -ENOENT);
609 			break;
610 		case 3:
611 			passed &= !rc;
612 			passed &= (args.np == p0);
613 			passed &= (args.args_count == 0);
614 			break;
615 		case 4:
616 			passed &= !rc;
617 			passed &= (args.np == p1);
618 			passed &= (args.args_count == 1);
619 			passed &= (args.args[0] == 3);
620 			break;
621 		case 5:
622 			passed &= !rc;
623 			passed &= (args.np == p0);
624 			passed &= (args.args_count == 0);
625 			break;
626 		case 6:
627 			passed &= !rc;
628 			passed &= (args.np == p2);
629 			passed &= (args.args_count == 2);
630 			passed &= (args.args[0] == 15);
631 			passed &= (args.args[1] == 0x20);
632 			break;
633 		case 7:
634 			passed &= (rc == -ENOENT);
635 			break;
636 		default:
637 			passed = false;
638 		}
639 
640 		unittest(passed, "index %i - data error on node %s rc=%i\n",
641 			 i, args.np->full_name, rc);
642 	}
643 
644 	/* Check for missing list property */
645 	memset(&args, 0, sizeof(args));
646 	rc = of_parse_phandle_with_args_map(np, "phandle-list-missing",
647 					    "phandle", 0, &args);
648 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
649 
650 	/* Check for missing cells,map,mask property */
651 	memset(&args, 0, sizeof(args));
652 
653 	EXPECT_BEGIN(KERN_INFO,
654 		     "OF: /testcase-data/phandle-tests/consumer-b: could not get #phandle-missing-cells for /testcase-data/phandle-tests/provider1");
655 
656 	rc = of_parse_phandle_with_args_map(np, "phandle-list",
657 					    "phandle-missing", 0, &args);
658 	EXPECT_END(KERN_INFO,
659 		   "OF: /testcase-data/phandle-tests/consumer-b: could not get #phandle-missing-cells for /testcase-data/phandle-tests/provider1");
660 
661 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
662 
663 	/* Check for bad phandle in list */
664 	memset(&args, 0, sizeof(args));
665 
666 	EXPECT_BEGIN(KERN_INFO,
667 		     "OF: /testcase-data/phandle-tests/consumer-b: could not find phandle 12345678");
668 
669 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-phandle",
670 					    "phandle", 0, &args);
671 	EXPECT_END(KERN_INFO,
672 		   "OF: /testcase-data/phandle-tests/consumer-b: could not find phandle 12345678");
673 
674 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
675 
676 	/* Check for incorrectly formed argument list */
677 	memset(&args, 0, sizeof(args));
678 
679 	EXPECT_BEGIN(KERN_INFO,
680 		     "OF: /testcase-data/phandle-tests/consumer-b: #phandle-cells = 2 found 1");
681 
682 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-args",
683 					    "phandle", 1, &args);
684 	EXPECT_END(KERN_INFO,
685 		   "OF: /testcase-data/phandle-tests/consumer-b: #phandle-cells = 2 found 1");
686 
687 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
688 }
689 
690 static void __init of_unittest_property_string(void)
691 {
692 	const char *strings[4];
693 	struct device_node *np;
694 	int rc;
695 
696 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
697 	if (!np) {
698 		pr_err("No testcase data in device tree\n");
699 		return;
700 	}
701 
702 	rc = of_property_match_string(np, "phandle-list-names", "first");
703 	unittest(rc == 0, "first expected:0 got:%i\n", rc);
704 	rc = of_property_match_string(np, "phandle-list-names", "second");
705 	unittest(rc == 1, "second expected:1 got:%i\n", rc);
706 	rc = of_property_match_string(np, "phandle-list-names", "third");
707 	unittest(rc == 2, "third expected:2 got:%i\n", rc);
708 	rc = of_property_match_string(np, "phandle-list-names", "fourth");
709 	unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
710 	rc = of_property_match_string(np, "missing-property", "blah");
711 	unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
712 	rc = of_property_match_string(np, "empty-property", "blah");
713 	unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
714 	rc = of_property_match_string(np, "unterminated-string", "blah");
715 	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
716 
717 	/* of_property_count_strings() tests */
718 	rc = of_property_count_strings(np, "string-property");
719 	unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
720 	rc = of_property_count_strings(np, "phandle-list-names");
721 	unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
722 	rc = of_property_count_strings(np, "unterminated-string");
723 	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
724 	rc = of_property_count_strings(np, "unterminated-string-list");
725 	unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
726 
727 	/* of_property_read_string_index() tests */
728 	rc = of_property_read_string_index(np, "string-property", 0, strings);
729 	unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
730 	strings[0] = NULL;
731 	rc = of_property_read_string_index(np, "string-property", 1, strings);
732 	unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
733 	rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
734 	unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
735 	rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
736 	unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
737 	rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
738 	unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
739 	strings[0] = NULL;
740 	rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
741 	unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
742 	strings[0] = NULL;
743 	rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
744 	unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
745 	rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
746 	unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
747 	strings[0] = NULL;
748 	rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
749 	unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
750 	strings[1] = NULL;
751 
752 	/* of_property_read_string_array() tests */
753 	rc = of_property_read_string_array(np, "string-property", strings, 4);
754 	unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
755 	rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
756 	unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
757 	rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
758 	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
759 	/* -- An incorrectly formed string should cause a failure */
760 	rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
761 	unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
762 	/* -- parsing the correctly formed strings should still work: */
763 	strings[2] = NULL;
764 	rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
765 	unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
766 	strings[1] = NULL;
767 	rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
768 	unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
769 }
770 
771 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
772 			(p1)->value && (p2)->value && \
773 			!memcmp((p1)->value, (p2)->value, (p1)->length) && \
774 			!strcmp((p1)->name, (p2)->name))
775 static void __init of_unittest_property_copy(void)
776 {
777 #ifdef CONFIG_OF_DYNAMIC
778 	struct property p1 = { .name = "p1", .length = 0, .value = "" };
779 	struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
780 	struct property *new;
781 
782 	new = __of_prop_dup(&p1, GFP_KERNEL);
783 	unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
784 	kfree(new->value);
785 	kfree(new->name);
786 	kfree(new);
787 
788 	new = __of_prop_dup(&p2, GFP_KERNEL);
789 	unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
790 	kfree(new->value);
791 	kfree(new->name);
792 	kfree(new);
793 #endif
794 }
795 
796 static void __init of_unittest_changeset(void)
797 {
798 #ifdef CONFIG_OF_DYNAMIC
799 	struct property *ppadd, padd = { .name = "prop-add", .length = 1, .value = "" };
800 	struct property *ppname_n1,  pname_n1  = { .name = "name", .length = 3, .value = "n1"  };
801 	struct property *ppname_n2,  pname_n2  = { .name = "name", .length = 3, .value = "n2"  };
802 	struct property *ppname_n21, pname_n21 = { .name = "name", .length = 3, .value = "n21" };
803 	struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
804 	struct property *ppremove;
805 	struct device_node *n1, *n2, *n21, *nchangeset, *nremove, *parent, *np;
806 	struct of_changeset chgset;
807 
808 	n1 = __of_node_dup(NULL, "n1");
809 	unittest(n1, "testcase setup failure\n");
810 
811 	n2 = __of_node_dup(NULL, "n2");
812 	unittest(n2, "testcase setup failure\n");
813 
814 	n21 = __of_node_dup(NULL, "n21");
815 	unittest(n21, "testcase setup failure %p\n", n21);
816 
817 	nchangeset = of_find_node_by_path("/testcase-data/changeset");
818 	nremove = of_get_child_by_name(nchangeset, "node-remove");
819 	unittest(nremove, "testcase setup failure\n");
820 
821 	ppadd = __of_prop_dup(&padd, GFP_KERNEL);
822 	unittest(ppadd, "testcase setup failure\n");
823 
824 	ppname_n1  = __of_prop_dup(&pname_n1, GFP_KERNEL);
825 	unittest(ppname_n1, "testcase setup failure\n");
826 
827 	ppname_n2  = __of_prop_dup(&pname_n2, GFP_KERNEL);
828 	unittest(ppname_n2, "testcase setup failure\n");
829 
830 	ppname_n21 = __of_prop_dup(&pname_n21, GFP_KERNEL);
831 	unittest(ppname_n21, "testcase setup failure\n");
832 
833 	ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
834 	unittest(ppupdate, "testcase setup failure\n");
835 
836 	parent = nchangeset;
837 	n1->parent = parent;
838 	n2->parent = parent;
839 	n21->parent = n2;
840 
841 	ppremove = of_find_property(parent, "prop-remove", NULL);
842 	unittest(ppremove, "failed to find removal prop");
843 
844 	of_changeset_init(&chgset);
845 
846 	unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
847 	unittest(!of_changeset_add_property(&chgset, n1, ppname_n1), "fail add prop name\n");
848 
849 	unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
850 	unittest(!of_changeset_add_property(&chgset, n2, ppname_n2), "fail add prop name\n");
851 
852 	unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
853 	unittest(!of_changeset_add_property(&chgset, n21, ppname_n21), "fail add prop name\n");
854 
855 	unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
856 
857 	unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop prop-add\n");
858 	unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
859 	unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
860 
861 	unittest(!of_changeset_apply(&chgset), "apply failed\n");
862 
863 	of_node_put(nchangeset);
864 
865 	/* Make sure node names are constructed correctly */
866 	unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
867 		 "'%pOF' not added\n", n21);
868 	of_node_put(np);
869 
870 	unittest(!of_changeset_revert(&chgset), "revert failed\n");
871 
872 	of_changeset_destroy(&chgset);
873 
874 	of_node_put(n1);
875 	of_node_put(n2);
876 	of_node_put(n21);
877 #endif
878 }
879 
880 static void __init of_unittest_dma_get_max_cpu_address(void)
881 {
882 	struct device_node *np;
883 	phys_addr_t cpu_addr;
884 
885 	if (!IS_ENABLED(CONFIG_OF_ADDRESS))
886 		return;
887 
888 	np = of_find_node_by_path("/testcase-data/address-tests");
889 	if (!np) {
890 		pr_err("missing testcase data\n");
891 		return;
892 	}
893 
894 	cpu_addr = of_dma_get_max_cpu_address(np);
895 	unittest(cpu_addr == 0x4fffffff,
896 		 "of_dma_get_max_cpu_address: wrong CPU addr %pad (expecting %x)\n",
897 		 &cpu_addr, 0x4fffffff);
898 }
899 
900 static void __init of_unittest_dma_ranges_one(const char *path,
901 		u64 expect_dma_addr, u64 expect_paddr)
902 {
903 #ifdef CONFIG_HAS_DMA
904 	struct device_node *np;
905 	const struct bus_dma_region *map = NULL;
906 	int rc;
907 
908 	np = of_find_node_by_path(path);
909 	if (!np) {
910 		pr_err("missing testcase data\n");
911 		return;
912 	}
913 
914 	rc = of_dma_get_range(np, &map);
915 
916 	unittest(!rc, "of_dma_get_range failed on node %pOF rc=%i\n", np, rc);
917 
918 	if (!rc) {
919 		phys_addr_t	paddr;
920 		dma_addr_t	dma_addr;
921 		struct device	*dev_bogus;
922 
923 		dev_bogus = kzalloc(sizeof(struct device), GFP_KERNEL);
924 		if (!dev_bogus) {
925 			unittest(0, "kzalloc() failed\n");
926 			kfree(map);
927 			return;
928 		}
929 
930 		dev_bogus->dma_range_map = map;
931 		paddr = dma_to_phys(dev_bogus, expect_dma_addr);
932 		dma_addr = phys_to_dma(dev_bogus, expect_paddr);
933 
934 		unittest(paddr == expect_paddr,
935 			 "of_dma_get_range: wrong phys addr %pap (expecting %llx) on node %pOF\n",
936 			 &paddr, expect_paddr, np);
937 		unittest(dma_addr == expect_dma_addr,
938 			 "of_dma_get_range: wrong DMA addr %pad (expecting %llx) on node %pOF\n",
939 			 &dma_addr, expect_dma_addr, np);
940 
941 		kfree(map);
942 		kfree(dev_bogus);
943 	}
944 	of_node_put(np);
945 #endif
946 }
947 
948 static void __init of_unittest_parse_dma_ranges(void)
949 {
950 	of_unittest_dma_ranges_one("/testcase-data/address-tests/device@70000000",
951 		0x0, 0x20000000);
952 	if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT))
953 		of_unittest_dma_ranges_one("/testcase-data/address-tests/bus@80000000/device@1000",
954 			0x100000000, 0x20000000);
955 	of_unittest_dma_ranges_one("/testcase-data/address-tests/pci@90000000",
956 		0x80000000, 0x20000000);
957 }
958 
959 static void __init of_unittest_pci_dma_ranges(void)
960 {
961 	struct device_node *np;
962 	struct of_pci_range range;
963 	struct of_pci_range_parser parser;
964 	int i = 0;
965 
966 	if (!IS_ENABLED(CONFIG_PCI))
967 		return;
968 
969 	np = of_find_node_by_path("/testcase-data/address-tests/pci@90000000");
970 	if (!np) {
971 		pr_err("missing testcase data\n");
972 		return;
973 	}
974 
975 	if (of_pci_dma_range_parser_init(&parser, np)) {
976 		pr_err("missing dma-ranges property\n");
977 		return;
978 	}
979 
980 	/*
981 	 * Get the dma-ranges from the device tree
982 	 */
983 	for_each_of_pci_range(&parser, &range) {
984 		if (!i) {
985 			unittest(range.size == 0x10000000,
986 				 "for_each_of_pci_range wrong size on node %pOF size=%llx\n",
987 				 np, range.size);
988 			unittest(range.cpu_addr == 0x20000000,
989 				 "for_each_of_pci_range wrong CPU addr (%llx) on node %pOF",
990 				 range.cpu_addr, np);
991 			unittest(range.pci_addr == 0x80000000,
992 				 "for_each_of_pci_range wrong DMA addr (%llx) on node %pOF",
993 				 range.pci_addr, np);
994 		} else {
995 			unittest(range.size == 0x10000000,
996 				 "for_each_of_pci_range wrong size on node %pOF size=%llx\n",
997 				 np, range.size);
998 			unittest(range.cpu_addr == 0x40000000,
999 				 "for_each_of_pci_range wrong CPU addr (%llx) on node %pOF",
1000 				 range.cpu_addr, np);
1001 			unittest(range.pci_addr == 0xc0000000,
1002 				 "for_each_of_pci_range wrong DMA addr (%llx) on node %pOF",
1003 				 range.pci_addr, np);
1004 		}
1005 		i++;
1006 	}
1007 
1008 	of_node_put(np);
1009 }
1010 
1011 static void __init of_unittest_bus_ranges(void)
1012 {
1013 	struct device_node *np;
1014 	struct of_range range;
1015 	struct of_range_parser parser;
1016 	struct resource res;
1017 	int ret, count, i = 0;
1018 
1019 	np = of_find_node_by_path("/testcase-data/address-tests");
1020 	if (!np) {
1021 		pr_err("missing testcase data\n");
1022 		return;
1023 	}
1024 
1025 	if (of_range_parser_init(&parser, np)) {
1026 		pr_err("missing ranges property\n");
1027 		return;
1028 	}
1029 
1030 	ret = of_range_to_resource(np, 1, &res);
1031 	unittest(!ret, "of_range_to_resource returned error (%d) node %pOF\n",
1032 		ret, np);
1033 	unittest(resource_type(&res) == IORESOURCE_MEM,
1034 		"of_range_to_resource wrong resource type on node %pOF res=%pR\n",
1035 		np, &res);
1036 	unittest(res.start == 0xd0000000,
1037 		"of_range_to_resource wrong resource start address on node %pOF res=%pR\n",
1038 		np, &res);
1039 	unittest(resource_size(&res) == 0x20000000,
1040 		"of_range_to_resource wrong resource start address on node %pOF res=%pR\n",
1041 		np, &res);
1042 
1043 	count = of_range_count(&parser);
1044 	unittest(count == 2,
1045 		"of_range_count wrong size on node %pOF count=%d\n",
1046 		np, count);
1047 
1048 	/*
1049 	 * Get the "ranges" from the device tree
1050 	 */
1051 	for_each_of_range(&parser, &range) {
1052 		unittest(range.flags == IORESOURCE_MEM,
1053 			"for_each_of_range wrong flags on node %pOF flags=%x (expected %x)\n",
1054 			np, range.flags, IORESOURCE_MEM);
1055 		if (!i) {
1056 			unittest(range.size == 0x50000000,
1057 				 "for_each_of_range wrong size on node %pOF size=%llx\n",
1058 				 np, range.size);
1059 			unittest(range.cpu_addr == 0x70000000,
1060 				 "for_each_of_range wrong CPU addr (%llx) on node %pOF",
1061 				 range.cpu_addr, np);
1062 			unittest(range.bus_addr == 0x70000000,
1063 				 "for_each_of_range wrong bus addr (%llx) on node %pOF",
1064 				 range.pci_addr, np);
1065 		} else {
1066 			unittest(range.size == 0x20000000,
1067 				 "for_each_of_range wrong size on node %pOF size=%llx\n",
1068 				 np, range.size);
1069 			unittest(range.cpu_addr == 0xd0000000,
1070 				 "for_each_of_range wrong CPU addr (%llx) on node %pOF",
1071 				 range.cpu_addr, np);
1072 			unittest(range.bus_addr == 0x00000000,
1073 				 "for_each_of_range wrong bus addr (%llx) on node %pOF",
1074 				 range.pci_addr, np);
1075 		}
1076 		i++;
1077 	}
1078 
1079 	of_node_put(np);
1080 }
1081 
1082 static void __init of_unittest_bus_3cell_ranges(void)
1083 {
1084 	struct device_node *np;
1085 	struct of_range range;
1086 	struct of_range_parser parser;
1087 	int i = 0;
1088 
1089 	np = of_find_node_by_path("/testcase-data/address-tests/bus@a0000000");
1090 	if (!np) {
1091 		pr_err("missing testcase data\n");
1092 		return;
1093 	}
1094 
1095 	if (of_range_parser_init(&parser, np)) {
1096 		pr_err("missing ranges property\n");
1097 		return;
1098 	}
1099 
1100 	/*
1101 	 * Get the "ranges" from the device tree
1102 	 */
1103 	for_each_of_range(&parser, &range) {
1104 		if (!i) {
1105 			unittest(range.flags == 0xf00baa,
1106 				 "for_each_of_range wrong flags on node %pOF flags=%x\n",
1107 				 np, range.flags);
1108 			unittest(range.size == 0x100000,
1109 				 "for_each_of_range wrong size on node %pOF size=%llx\n",
1110 				 np, range.size);
1111 			unittest(range.cpu_addr == 0xa0000000,
1112 				 "for_each_of_range wrong CPU addr (%llx) on node %pOF",
1113 				 range.cpu_addr, np);
1114 			unittest(range.bus_addr == 0x0,
1115 				 "for_each_of_range wrong bus addr (%llx) on node %pOF",
1116 				 range.pci_addr, np);
1117 		} else {
1118 			unittest(range.flags == 0xf00bee,
1119 				 "for_each_of_range wrong flags on node %pOF flags=%x\n",
1120 				 np, range.flags);
1121 			unittest(range.size == 0x200000,
1122 				 "for_each_of_range wrong size on node %pOF size=%llx\n",
1123 				 np, range.size);
1124 			unittest(range.cpu_addr == 0xb0000000,
1125 				 "for_each_of_range wrong CPU addr (%llx) on node %pOF",
1126 				 range.cpu_addr, np);
1127 			unittest(range.bus_addr == 0x100000000,
1128 				 "for_each_of_range wrong bus addr (%llx) on node %pOF",
1129 				 range.pci_addr, np);
1130 		}
1131 		i++;
1132 	}
1133 
1134 	of_node_put(np);
1135 }
1136 
1137 static void __init of_unittest_reg(void)
1138 {
1139 	struct device_node *np;
1140 	int ret;
1141 	u64 addr, size;
1142 
1143 	np = of_find_node_by_path("/testcase-data/address-tests/bus@80000000/device@1000");
1144 	if (!np) {
1145 		pr_err("missing testcase data\n");
1146 		return;
1147 	}
1148 
1149 	ret = of_property_read_reg(np, 0, &addr, &size);
1150 	unittest(!ret, "of_property_read_reg(%pOF) returned error %d\n",
1151 		np, ret);
1152 	unittest(addr == 0x1000, "of_property_read_reg(%pOF) untranslated address (%llx) incorrect\n",
1153 		np, addr);
1154 
1155 	of_node_put(np);
1156 }
1157 
1158 static void __init of_unittest_parse_interrupts(void)
1159 {
1160 	struct device_node *np;
1161 	struct of_phandle_args args;
1162 	int i, rc;
1163 
1164 	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
1165 		return;
1166 
1167 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
1168 	if (!np) {
1169 		pr_err("missing testcase data\n");
1170 		return;
1171 	}
1172 
1173 	for (i = 0; i < 4; i++) {
1174 		bool passed = true;
1175 
1176 		memset(&args, 0, sizeof(args));
1177 		rc = of_irq_parse_one(np, i, &args);
1178 
1179 		passed &= !rc;
1180 		passed &= (args.args_count == 1);
1181 		passed &= (args.args[0] == (i + 1));
1182 
1183 		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
1184 			 i, args.np, rc);
1185 	}
1186 	of_node_put(np);
1187 
1188 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
1189 	if (!np) {
1190 		pr_err("missing testcase data\n");
1191 		return;
1192 	}
1193 
1194 	for (i = 0; i < 4; i++) {
1195 		bool passed = true;
1196 
1197 		memset(&args, 0, sizeof(args));
1198 		rc = of_irq_parse_one(np, i, &args);
1199 
1200 		/* Test the values from tests-phandle.dtsi */
1201 		switch (i) {
1202 		case 0:
1203 			passed &= !rc;
1204 			passed &= (args.args_count == 1);
1205 			passed &= (args.args[0] == 9);
1206 			break;
1207 		case 1:
1208 			passed &= !rc;
1209 			passed &= (args.args_count == 3);
1210 			passed &= (args.args[0] == 10);
1211 			passed &= (args.args[1] == 11);
1212 			passed &= (args.args[2] == 12);
1213 			break;
1214 		case 2:
1215 			passed &= !rc;
1216 			passed &= (args.args_count == 2);
1217 			passed &= (args.args[0] == 13);
1218 			passed &= (args.args[1] == 14);
1219 			break;
1220 		case 3:
1221 			passed &= !rc;
1222 			passed &= (args.args_count == 2);
1223 			passed &= (args.args[0] == 15);
1224 			passed &= (args.args[1] == 16);
1225 			break;
1226 		default:
1227 			passed = false;
1228 		}
1229 		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
1230 			 i, args.np, rc);
1231 	}
1232 	of_node_put(np);
1233 }
1234 
1235 static void __init of_unittest_parse_interrupts_extended(void)
1236 {
1237 	struct device_node *np;
1238 	struct of_phandle_args args;
1239 	int i, rc;
1240 
1241 	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
1242 		return;
1243 
1244 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
1245 	if (!np) {
1246 		pr_err("missing testcase data\n");
1247 		return;
1248 	}
1249 
1250 	for (i = 0; i < 7; i++) {
1251 		bool passed = true;
1252 
1253 		memset(&args, 0, sizeof(args));
1254 		rc = of_irq_parse_one(np, i, &args);
1255 
1256 		/* Test the values from tests-phandle.dtsi */
1257 		switch (i) {
1258 		case 0:
1259 			passed &= !rc;
1260 			passed &= (args.args_count == 1);
1261 			passed &= (args.args[0] == 1);
1262 			break;
1263 		case 1:
1264 			passed &= !rc;
1265 			passed &= (args.args_count == 3);
1266 			passed &= (args.args[0] == 2);
1267 			passed &= (args.args[1] == 3);
1268 			passed &= (args.args[2] == 4);
1269 			break;
1270 		case 2:
1271 			passed &= !rc;
1272 			passed &= (args.args_count == 2);
1273 			passed &= (args.args[0] == 5);
1274 			passed &= (args.args[1] == 6);
1275 			break;
1276 		case 3:
1277 			passed &= !rc;
1278 			passed &= (args.args_count == 1);
1279 			passed &= (args.args[0] == 9);
1280 			break;
1281 		case 4:
1282 			passed &= !rc;
1283 			passed &= (args.args_count == 3);
1284 			passed &= (args.args[0] == 10);
1285 			passed &= (args.args[1] == 11);
1286 			passed &= (args.args[2] == 12);
1287 			break;
1288 		case 5:
1289 			passed &= !rc;
1290 			passed &= (args.args_count == 2);
1291 			passed &= (args.args[0] == 13);
1292 			passed &= (args.args[1] == 14);
1293 			break;
1294 		case 6:
1295 			/*
1296 			 * Tests child node that is missing property
1297 			 * #address-cells.  See the comments in
1298 			 * drivers/of/unittest-data/tests-interrupts.dtsi
1299 			 * nodes intmap1 and interrupts-extended0
1300 			 */
1301 			passed &= !rc;
1302 			passed &= (args.args_count == 1);
1303 			passed &= (args.args[0] == 15);
1304 			break;
1305 		default:
1306 			passed = false;
1307 		}
1308 
1309 		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
1310 			 i, args.np, rc);
1311 	}
1312 	of_node_put(np);
1313 }
1314 
1315 static const struct of_device_id match_node_table[] = {
1316 	{ .data = "A", .name = "name0", }, /* Name alone is lowest priority */
1317 	{ .data = "B", .type = "type1", }, /* followed by type alone */
1318 
1319 	{ .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
1320 	{ .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
1321 	{ .data = "Cc", .name = "name2", .type = "type2", },
1322 
1323 	{ .data = "E", .compatible = "compat3" },
1324 	{ .data = "G", .compatible = "compat2", },
1325 	{ .data = "H", .compatible = "compat2", .name = "name5", },
1326 	{ .data = "I", .compatible = "compat2", .type = "type1", },
1327 	{ .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
1328 	{ .data = "K", .compatible = "compat2", .name = "name9", },
1329 	{}
1330 };
1331 
1332 static struct {
1333 	const char *path;
1334 	const char *data;
1335 } match_node_tests[] = {
1336 	{ .path = "/testcase-data/match-node/name0", .data = "A", },
1337 	{ .path = "/testcase-data/match-node/name1", .data = "B", },
1338 	{ .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
1339 	{ .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
1340 	{ .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
1341 	{ .path = "/testcase-data/match-node/name3", .data = "E", },
1342 	{ .path = "/testcase-data/match-node/name4", .data = "G", },
1343 	{ .path = "/testcase-data/match-node/name5", .data = "H", },
1344 	{ .path = "/testcase-data/match-node/name6", .data = "G", },
1345 	{ .path = "/testcase-data/match-node/name7", .data = "I", },
1346 	{ .path = "/testcase-data/match-node/name8", .data = "J", },
1347 	{ .path = "/testcase-data/match-node/name9", .data = "K", },
1348 };
1349 
1350 static void __init of_unittest_match_node(void)
1351 {
1352 	struct device_node *np;
1353 	const struct of_device_id *match;
1354 	int i;
1355 
1356 	for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
1357 		np = of_find_node_by_path(match_node_tests[i].path);
1358 		if (!np) {
1359 			unittest(0, "missing testcase node %s\n",
1360 				match_node_tests[i].path);
1361 			continue;
1362 		}
1363 
1364 		match = of_match_node(match_node_table, np);
1365 		if (!match) {
1366 			unittest(0, "%s didn't match anything\n",
1367 				match_node_tests[i].path);
1368 			continue;
1369 		}
1370 
1371 		if (strcmp(match->data, match_node_tests[i].data) != 0) {
1372 			unittest(0, "%s got wrong match. expected %s, got %s\n",
1373 				match_node_tests[i].path, match_node_tests[i].data,
1374 				(const char *)match->data);
1375 			continue;
1376 		}
1377 		unittest(1, "passed");
1378 	}
1379 }
1380 
1381 static struct resource test_bus_res = DEFINE_RES_MEM(0xfffffff8, 2);
1382 static const struct platform_device_info test_bus_info = {
1383 	.name = "unittest-bus",
1384 };
1385 static void __init of_unittest_platform_populate(void)
1386 {
1387 	int irq, rc;
1388 	struct device_node *np, *child, *grandchild;
1389 	struct platform_device *pdev, *test_bus;
1390 	const struct of_device_id match[] = {
1391 		{ .compatible = "test-device", },
1392 		{}
1393 	};
1394 
1395 	np = of_find_node_by_path("/testcase-data");
1396 	of_platform_default_populate(np, NULL, NULL);
1397 
1398 	/* Test that a missing irq domain returns -EPROBE_DEFER */
1399 	np = of_find_node_by_path("/testcase-data/testcase-device1");
1400 	pdev = of_find_device_by_node(np);
1401 	unittest(pdev, "device 1 creation failed\n");
1402 
1403 	if (!(of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)) {
1404 		irq = platform_get_irq(pdev, 0);
1405 		unittest(irq == -EPROBE_DEFER,
1406 			 "device deferred probe failed - %d\n", irq);
1407 
1408 		/* Test that a parsing failure does not return -EPROBE_DEFER */
1409 		np = of_find_node_by_path("/testcase-data/testcase-device2");
1410 		pdev = of_find_device_by_node(np);
1411 		unittest(pdev, "device 2 creation failed\n");
1412 
1413 		EXPECT_BEGIN(KERN_INFO,
1414 			     "platform testcase-data:testcase-device2: error -ENXIO: IRQ index 0 not found");
1415 
1416 		irq = platform_get_irq(pdev, 0);
1417 
1418 		EXPECT_END(KERN_INFO,
1419 			   "platform testcase-data:testcase-device2: error -ENXIO: IRQ index 0 not found");
1420 
1421 		unittest(irq < 0 && irq != -EPROBE_DEFER,
1422 			 "device parsing error failed - %d\n", irq);
1423 	}
1424 
1425 	np = of_find_node_by_path("/testcase-data/platform-tests");
1426 	unittest(np, "No testcase data in device tree\n");
1427 	if (!np)
1428 		return;
1429 
1430 	test_bus = platform_device_register_full(&test_bus_info);
1431 	rc = PTR_ERR_OR_ZERO(test_bus);
1432 	unittest(!rc, "testbus registration failed; rc=%i\n", rc);
1433 	if (rc) {
1434 		of_node_put(np);
1435 		return;
1436 	}
1437 	test_bus->dev.of_node = np;
1438 
1439 	/*
1440 	 * Add a dummy resource to the test bus node after it is
1441 	 * registered to catch problems with un-inserted resources. The
1442 	 * DT code doesn't insert the resources, and it has caused the
1443 	 * kernel to oops in the past. This makes sure the same bug
1444 	 * doesn't crop up again.
1445 	 */
1446 	platform_device_add_resources(test_bus, &test_bus_res, 1);
1447 
1448 	of_platform_populate(np, match, NULL, &test_bus->dev);
1449 	for_each_child_of_node(np, child) {
1450 		for_each_child_of_node(child, grandchild) {
1451 			pdev = of_find_device_by_node(grandchild);
1452 			unittest(pdev,
1453 				 "Could not create device for node '%pOFn'\n",
1454 				 grandchild);
1455 			platform_device_put(pdev);
1456 		}
1457 	}
1458 
1459 	of_platform_depopulate(&test_bus->dev);
1460 	for_each_child_of_node(np, child) {
1461 		for_each_child_of_node(child, grandchild)
1462 			unittest(!of_find_device_by_node(grandchild),
1463 				 "device didn't get destroyed '%pOFn'\n",
1464 				 grandchild);
1465 	}
1466 
1467 	platform_device_unregister(test_bus);
1468 	of_node_put(np);
1469 }
1470 
1471 /**
1472  *	update_node_properties - adds the properties
1473  *	of np into dup node (present in live tree) and
1474  *	updates parent of children of np to dup.
1475  *
1476  *	@np:	node whose properties are being added to the live tree
1477  *	@dup:	node present in live tree to be updated
1478  */
1479 static void update_node_properties(struct device_node *np,
1480 					struct device_node *dup)
1481 {
1482 	struct property *prop;
1483 	struct property *save_next;
1484 	struct device_node *child;
1485 	int ret;
1486 
1487 	for_each_child_of_node(np, child)
1488 		child->parent = dup;
1489 
1490 	/*
1491 	 * "unittest internal error: unable to add testdata property"
1492 	 *
1493 	 *    If this message reports a property in node '/__symbols__' then
1494 	 *    the respective unittest overlay contains a label that has the
1495 	 *    same name as a label in the live devicetree.  The label will
1496 	 *    be in the live devicetree only if the devicetree source was
1497 	 *    compiled with the '-@' option.  If you encounter this error,
1498 	 *    please consider renaming __all__ of the labels in the unittest
1499 	 *    overlay dts files with an odd prefix that is unlikely to be
1500 	 *    used in a real devicetree.
1501 	 */
1502 
1503 	/*
1504 	 * open code for_each_property_of_node() because of_add_property()
1505 	 * sets prop->next to NULL
1506 	 */
1507 	for (prop = np->properties; prop != NULL; prop = save_next) {
1508 		save_next = prop->next;
1509 		ret = of_add_property(dup, prop);
1510 		if (ret) {
1511 			if (ret == -EEXIST && !strcmp(prop->name, "name"))
1512 				continue;
1513 			pr_err("unittest internal error: unable to add testdata property %pOF/%s",
1514 			       np, prop->name);
1515 		}
1516 	}
1517 }
1518 
1519 /**
1520  *	attach_node_and_children - attaches nodes
1521  *	and its children to live tree.
1522  *	CAUTION: misleading function name - if node @np already exists in
1523  *	the live tree then children of @np are *not* attached to the live
1524  *	tree.  This works for the current test devicetree nodes because such
1525  *	nodes do not have child nodes.
1526  *
1527  *	@np:	Node to attach to live tree
1528  */
1529 static void attach_node_and_children(struct device_node *np)
1530 {
1531 	struct device_node *next, *dup, *child;
1532 	unsigned long flags;
1533 	const char *full_name;
1534 
1535 	full_name = kasprintf(GFP_KERNEL, "%pOF", np);
1536 
1537 	if (!strcmp(full_name, "/__local_fixups__") ||
1538 	    !strcmp(full_name, "/__fixups__")) {
1539 		kfree(full_name);
1540 		return;
1541 	}
1542 
1543 	dup = of_find_node_by_path(full_name);
1544 	kfree(full_name);
1545 	if (dup) {
1546 		update_node_properties(np, dup);
1547 		return;
1548 	}
1549 
1550 	child = np->child;
1551 	np->child = NULL;
1552 
1553 	mutex_lock(&of_mutex);
1554 	raw_spin_lock_irqsave(&devtree_lock, flags);
1555 	np->sibling = np->parent->child;
1556 	np->parent->child = np;
1557 	of_node_clear_flag(np, OF_DETACHED);
1558 	raw_spin_unlock_irqrestore(&devtree_lock, flags);
1559 
1560 	__of_attach_node_sysfs(np);
1561 	mutex_unlock(&of_mutex);
1562 
1563 	while (child) {
1564 		next = child->sibling;
1565 		attach_node_and_children(child);
1566 		child = next;
1567 	}
1568 }
1569 
1570 /**
1571  *	unittest_data_add - Reads, copies data from
1572  *	linked tree and attaches it to the live tree
1573  */
1574 static int __init unittest_data_add(void)
1575 {
1576 	void *unittest_data;
1577 	void *unittest_data_align;
1578 	struct device_node *unittest_data_node = NULL, *np;
1579 	/*
1580 	 * __dtbo_testcases_begin[] and __dtbo_testcases_end[] are magically
1581 	 * created by cmd_dt_S_dtbo in scripts/Makefile.lib
1582 	 */
1583 	extern uint8_t __dtbo_testcases_begin[];
1584 	extern uint8_t __dtbo_testcases_end[];
1585 	const int size = __dtbo_testcases_end - __dtbo_testcases_begin;
1586 	int rc;
1587 	void *ret;
1588 
1589 	if (!size) {
1590 		pr_warn("%s: testcases is empty\n", __func__);
1591 		return -ENODATA;
1592 	}
1593 
1594 	/* creating copy */
1595 	unittest_data = kmalloc(size + FDT_ALIGN_SIZE, GFP_KERNEL);
1596 	if (!unittest_data)
1597 		return -ENOMEM;
1598 
1599 	unittest_data_align = PTR_ALIGN(unittest_data, FDT_ALIGN_SIZE);
1600 	memcpy(unittest_data_align, __dtbo_testcases_begin, size);
1601 
1602 	ret = of_fdt_unflatten_tree(unittest_data_align, NULL, &unittest_data_node);
1603 	if (!ret) {
1604 		pr_warn("%s: unflatten testcases tree failed\n", __func__);
1605 		kfree(unittest_data);
1606 		return -ENODATA;
1607 	}
1608 	if (!unittest_data_node) {
1609 		pr_warn("%s: testcases tree is empty\n", __func__);
1610 		kfree(unittest_data);
1611 		return -ENODATA;
1612 	}
1613 
1614 	/*
1615 	 * This lock normally encloses of_resolve_phandles()
1616 	 */
1617 	of_overlay_mutex_lock();
1618 
1619 	rc = of_resolve_phandles(unittest_data_node);
1620 	if (rc) {
1621 		pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
1622 		of_overlay_mutex_unlock();
1623 		return -EINVAL;
1624 	}
1625 
1626 	if (!of_root) {
1627 		of_root = unittest_data_node;
1628 		for_each_of_allnodes(np)
1629 			__of_attach_node_sysfs(np);
1630 		of_aliases = of_find_node_by_path("/aliases");
1631 		of_chosen = of_find_node_by_path("/chosen");
1632 		of_overlay_mutex_unlock();
1633 		return 0;
1634 	}
1635 
1636 	EXPECT_BEGIN(KERN_INFO,
1637 		     "Duplicate name in testcase-data, renamed to \"duplicate-name#1\"");
1638 
1639 	/* attach the sub-tree to live tree */
1640 	np = unittest_data_node->child;
1641 	while (np) {
1642 		struct device_node *next = np->sibling;
1643 
1644 		np->parent = of_root;
1645 		/* this will clear OF_DETACHED in np and children */
1646 		attach_node_and_children(np);
1647 		np = next;
1648 	}
1649 
1650 	EXPECT_END(KERN_INFO,
1651 		   "Duplicate name in testcase-data, renamed to \"duplicate-name#1\"");
1652 
1653 	of_overlay_mutex_unlock();
1654 
1655 	return 0;
1656 }
1657 
1658 #ifdef CONFIG_OF_OVERLAY
1659 static int __init overlay_data_apply(const char *overlay_name, int *ovcs_id);
1660 
1661 static int unittest_probe(struct platform_device *pdev)
1662 {
1663 	struct device *dev = &pdev->dev;
1664 	struct device_node *np = dev->of_node;
1665 
1666 	if (np == NULL) {
1667 		dev_err(dev, "No OF data for device\n");
1668 		return -EINVAL;
1669 
1670 	}
1671 
1672 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1673 
1674 	of_platform_populate(np, NULL, NULL, &pdev->dev);
1675 
1676 	return 0;
1677 }
1678 
1679 static void unittest_remove(struct platform_device *pdev)
1680 {
1681 	struct device *dev = &pdev->dev;
1682 	struct device_node *np = dev->of_node;
1683 
1684 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
1685 }
1686 
1687 static const struct of_device_id unittest_match[] = {
1688 	{ .compatible = "unittest", },
1689 	{},
1690 };
1691 
1692 static struct platform_driver unittest_driver = {
1693 	.probe			= unittest_probe,
1694 	.remove_new		= unittest_remove,
1695 	.driver = {
1696 		.name		= "unittest",
1697 		.of_match_table	= of_match_ptr(unittest_match),
1698 	},
1699 };
1700 
1701 /* get the platform device instantiated at the path */
1702 static struct platform_device *of_path_to_platform_device(const char *path)
1703 {
1704 	struct device_node *np;
1705 	struct platform_device *pdev;
1706 
1707 	np = of_find_node_by_path(path);
1708 	if (np == NULL)
1709 		return NULL;
1710 
1711 	pdev = of_find_device_by_node(np);
1712 	of_node_put(np);
1713 
1714 	return pdev;
1715 }
1716 
1717 /* find out if a platform device exists at that path */
1718 static int of_path_platform_device_exists(const char *path)
1719 {
1720 	struct platform_device *pdev;
1721 
1722 	pdev = of_path_to_platform_device(path);
1723 	platform_device_put(pdev);
1724 	return pdev != NULL;
1725 }
1726 
1727 #ifdef CONFIG_OF_GPIO
1728 
1729 struct unittest_gpio_dev {
1730 	struct gpio_chip chip;
1731 };
1732 
1733 static int unittest_gpio_chip_request_count;
1734 static int unittest_gpio_probe_count;
1735 static int unittest_gpio_probe_pass_count;
1736 
1737 static int unittest_gpio_chip_request(struct gpio_chip *chip, unsigned int offset)
1738 {
1739 	unittest_gpio_chip_request_count++;
1740 
1741 	pr_debug("%s(): %s %d %d\n", __func__, chip->label, offset,
1742 		 unittest_gpio_chip_request_count);
1743 	return 0;
1744 }
1745 
1746 static int unittest_gpio_probe(struct platform_device *pdev)
1747 {
1748 	struct unittest_gpio_dev *devptr;
1749 	int ret;
1750 
1751 	unittest_gpio_probe_count++;
1752 
1753 	devptr = kzalloc(sizeof(*devptr), GFP_KERNEL);
1754 	if (!devptr)
1755 		return -ENOMEM;
1756 
1757 	platform_set_drvdata(pdev, devptr);
1758 
1759 	devptr->chip.fwnode = dev_fwnode(&pdev->dev);
1760 	devptr->chip.label = "of-unittest-gpio";
1761 	devptr->chip.base = -1; /* dynamic allocation */
1762 	devptr->chip.ngpio = 5;
1763 	devptr->chip.request = unittest_gpio_chip_request;
1764 
1765 	ret = gpiochip_add_data(&devptr->chip, NULL);
1766 
1767 	unittest(!ret,
1768 		 "gpiochip_add_data() for node @%pfw failed, ret = %d\n", devptr->chip.fwnode, ret);
1769 
1770 	if (!ret)
1771 		unittest_gpio_probe_pass_count++;
1772 	return ret;
1773 }
1774 
1775 static void unittest_gpio_remove(struct platform_device *pdev)
1776 {
1777 	struct unittest_gpio_dev *devptr = platform_get_drvdata(pdev);
1778 	struct device *dev = &pdev->dev;
1779 
1780 	dev_dbg(dev, "%s for node @%pfw\n", __func__, devptr->chip.fwnode);
1781 
1782 	if (devptr->chip.base != -1)
1783 		gpiochip_remove(&devptr->chip);
1784 
1785 	kfree(devptr);
1786 }
1787 
1788 static const struct of_device_id unittest_gpio_id[] = {
1789 	{ .compatible = "unittest-gpio", },
1790 	{}
1791 };
1792 
1793 static struct platform_driver unittest_gpio_driver = {
1794 	.probe	= unittest_gpio_probe,
1795 	.remove_new = unittest_gpio_remove,
1796 	.driver	= {
1797 		.name		= "unittest-gpio",
1798 		.of_match_table	= of_match_ptr(unittest_gpio_id),
1799 	},
1800 };
1801 
1802 static void __init of_unittest_overlay_gpio(void)
1803 {
1804 	int chip_request_count;
1805 	int probe_pass_count;
1806 	int ret;
1807 
1808 	/*
1809 	 * tests: apply overlays before registering driver
1810 	 * Similar to installing a driver as a module, the
1811 	 * driver is registered after applying the overlays.
1812 	 *
1813 	 * The overlays are applied by overlay_data_apply()
1814 	 * instead of of_unittest_apply_overlay() so that they
1815 	 * will not be tracked.  Thus they will not be removed
1816 	 * by of_unittest_remove_tracked_overlays().
1817 	 *
1818 	 * - apply overlay_gpio_01
1819 	 * - apply overlay_gpio_02a
1820 	 * - apply overlay_gpio_02b
1821 	 * - register driver
1822 	 *
1823 	 * register driver will result in
1824 	 *   - probe and processing gpio hog for overlay_gpio_01
1825 	 *   - probe for overlay_gpio_02a
1826 	 *   - processing gpio for overlay_gpio_02b
1827 	 */
1828 
1829 	probe_pass_count = unittest_gpio_probe_pass_count;
1830 	chip_request_count = unittest_gpio_chip_request_count;
1831 
1832 	/*
1833 	 * overlay_gpio_01 contains gpio node and child gpio hog node
1834 	 * overlay_gpio_02a contains gpio node
1835 	 * overlay_gpio_02b contains child gpio hog node
1836 	 */
1837 
1838 	unittest(overlay_data_apply("overlay_gpio_01", NULL),
1839 		 "Adding overlay 'overlay_gpio_01' failed\n");
1840 
1841 	unittest(overlay_data_apply("overlay_gpio_02a", NULL),
1842 		 "Adding overlay 'overlay_gpio_02a' failed\n");
1843 
1844 	unittest(overlay_data_apply("overlay_gpio_02b", NULL),
1845 		 "Adding overlay 'overlay_gpio_02b' failed\n");
1846 
1847 	ret = platform_driver_register(&unittest_gpio_driver);
1848 	if (unittest(ret == 0, "could not register unittest gpio driver\n"))
1849 		return;
1850 
1851 	unittest(probe_pass_count + 2 == unittest_gpio_probe_pass_count,
1852 		 "unittest_gpio_probe() failed or not called\n");
1853 
1854 	unittest(chip_request_count + 2 == unittest_gpio_chip_request_count,
1855 		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
1856 		 unittest_gpio_chip_request_count - chip_request_count);
1857 
1858 	/*
1859 	 * tests: apply overlays after registering driver
1860 	 *
1861 	 * Similar to a driver built-in to the kernel, the
1862 	 * driver is registered before applying the overlays.
1863 	 *
1864 	 * overlay_gpio_03 contains gpio node and child gpio hog node
1865 	 *
1866 	 * - apply overlay_gpio_03
1867 	 *
1868 	 * apply overlay will result in
1869 	 *   - probe and processing gpio hog.
1870 	 */
1871 
1872 	probe_pass_count = unittest_gpio_probe_pass_count;
1873 	chip_request_count = unittest_gpio_chip_request_count;
1874 
1875 	/* overlay_gpio_03 contains gpio node and child gpio hog node */
1876 
1877 	unittest(overlay_data_apply("overlay_gpio_03", NULL),
1878 		 "Adding overlay 'overlay_gpio_03' failed\n");
1879 
1880 	unittest(probe_pass_count + 1 == unittest_gpio_probe_pass_count,
1881 		 "unittest_gpio_probe() failed or not called\n");
1882 
1883 	unittest(chip_request_count + 1 == unittest_gpio_chip_request_count,
1884 		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
1885 		 unittest_gpio_chip_request_count - chip_request_count);
1886 
1887 	/*
1888 	 * overlay_gpio_04a contains gpio node
1889 	 *
1890 	 * - apply overlay_gpio_04a
1891 	 *
1892 	 * apply the overlay will result in
1893 	 *   - probe for overlay_gpio_04a
1894 	 */
1895 
1896 	probe_pass_count = unittest_gpio_probe_pass_count;
1897 	chip_request_count = unittest_gpio_chip_request_count;
1898 
1899 	/* overlay_gpio_04a contains gpio node */
1900 
1901 	unittest(overlay_data_apply("overlay_gpio_04a", NULL),
1902 		 "Adding overlay 'overlay_gpio_04a' failed\n");
1903 
1904 	unittest(probe_pass_count + 1 == unittest_gpio_probe_pass_count,
1905 		 "unittest_gpio_probe() failed or not called\n");
1906 
1907 	/*
1908 	 * overlay_gpio_04b contains child gpio hog node
1909 	 *
1910 	 * - apply overlay_gpio_04b
1911 	 *
1912 	 * apply the overlay will result in
1913 	 *   - processing gpio for overlay_gpio_04b
1914 	 */
1915 
1916 	/* overlay_gpio_04b contains child gpio hog node */
1917 
1918 	unittest(overlay_data_apply("overlay_gpio_04b", NULL),
1919 		 "Adding overlay 'overlay_gpio_04b' failed\n");
1920 
1921 	unittest(chip_request_count + 1 == unittest_gpio_chip_request_count,
1922 		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
1923 		 unittest_gpio_chip_request_count - chip_request_count);
1924 }
1925 
1926 #else
1927 
1928 static void __init of_unittest_overlay_gpio(void)
1929 {
1930 	/* skip tests */
1931 }
1932 
1933 #endif
1934 
1935 #if IS_BUILTIN(CONFIG_I2C)
1936 
1937 /* get the i2c client device instantiated at the path */
1938 static struct i2c_client *of_path_to_i2c_client(const char *path)
1939 {
1940 	struct device_node *np;
1941 	struct i2c_client *client;
1942 
1943 	np = of_find_node_by_path(path);
1944 	if (np == NULL)
1945 		return NULL;
1946 
1947 	client = of_find_i2c_device_by_node(np);
1948 	of_node_put(np);
1949 
1950 	return client;
1951 }
1952 
1953 /* find out if a i2c client device exists at that path */
1954 static int of_path_i2c_client_exists(const char *path)
1955 {
1956 	struct i2c_client *client;
1957 
1958 	client = of_path_to_i2c_client(path);
1959 	if (client)
1960 		put_device(&client->dev);
1961 	return client != NULL;
1962 }
1963 #else
1964 static int of_path_i2c_client_exists(const char *path)
1965 {
1966 	return 0;
1967 }
1968 #endif
1969 
1970 enum overlay_type {
1971 	PDEV_OVERLAY,
1972 	I2C_OVERLAY
1973 };
1974 
1975 static int of_path_device_type_exists(const char *path,
1976 		enum overlay_type ovtype)
1977 {
1978 	switch (ovtype) {
1979 	case PDEV_OVERLAY:
1980 		return of_path_platform_device_exists(path);
1981 	case I2C_OVERLAY:
1982 		return of_path_i2c_client_exists(path);
1983 	}
1984 	return 0;
1985 }
1986 
1987 static const char *unittest_path(int nr, enum overlay_type ovtype)
1988 {
1989 	const char *base;
1990 	static char buf[256];
1991 
1992 	switch (ovtype) {
1993 	case PDEV_OVERLAY:
1994 		base = "/testcase-data/overlay-node/test-bus";
1995 		break;
1996 	case I2C_OVERLAY:
1997 		base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1998 		break;
1999 	default:
2000 		buf[0] = '\0';
2001 		return buf;
2002 	}
2003 	snprintf(buf, sizeof(buf) - 1, "%s/test-unittest%d", base, nr);
2004 	buf[sizeof(buf) - 1] = '\0';
2005 	return buf;
2006 }
2007 
2008 static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
2009 {
2010 	const char *path;
2011 
2012 	path = unittest_path(unittest_nr, ovtype);
2013 
2014 	switch (ovtype) {
2015 	case PDEV_OVERLAY:
2016 		return of_path_platform_device_exists(path);
2017 	case I2C_OVERLAY:
2018 		return of_path_i2c_client_exists(path);
2019 	}
2020 	return 0;
2021 }
2022 
2023 static const char *overlay_name_from_nr(int nr)
2024 {
2025 	static char buf[256];
2026 
2027 	snprintf(buf, sizeof(buf) - 1,
2028 		"overlay_%d", nr);
2029 	buf[sizeof(buf) - 1] = '\0';
2030 
2031 	return buf;
2032 }
2033 
2034 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
2035 
2036 #define MAX_TRACK_OVCS_IDS 256
2037 
2038 static int track_ovcs_id[MAX_TRACK_OVCS_IDS];
2039 static int track_ovcs_id_overlay_nr[MAX_TRACK_OVCS_IDS];
2040 static int track_ovcs_id_cnt;
2041 
2042 static void of_unittest_track_overlay(int ovcs_id, int overlay_nr)
2043 {
2044 	if (WARN_ON(track_ovcs_id_cnt >= MAX_TRACK_OVCS_IDS))
2045 		return;
2046 
2047 	track_ovcs_id[track_ovcs_id_cnt] = ovcs_id;
2048 	track_ovcs_id_overlay_nr[track_ovcs_id_cnt] = overlay_nr;
2049 	track_ovcs_id_cnt++;
2050 }
2051 
2052 static void of_unittest_untrack_overlay(int ovcs_id)
2053 {
2054 	if (WARN_ON(track_ovcs_id_cnt < 1))
2055 		return;
2056 
2057 	track_ovcs_id_cnt--;
2058 
2059 	/* If out of synch then test is broken.  Do not try to recover. */
2060 	WARN_ON(track_ovcs_id[track_ovcs_id_cnt] != ovcs_id);
2061 }
2062 
2063 static void of_unittest_remove_tracked_overlays(void)
2064 {
2065 	int ret, ovcs_id, overlay_nr, save_ovcs_id;
2066 	const char *overlay_name;
2067 
2068 	while (track_ovcs_id_cnt > 0) {
2069 
2070 		ovcs_id = track_ovcs_id[track_ovcs_id_cnt - 1];
2071 		overlay_nr = track_ovcs_id_overlay_nr[track_ovcs_id_cnt - 1];
2072 		save_ovcs_id = ovcs_id;
2073 		ret = of_overlay_remove(&ovcs_id);
2074 		if (ret == -ENODEV) {
2075 			overlay_name = overlay_name_from_nr(overlay_nr);
2076 			pr_warn("%s: of_overlay_remove() for overlay \"%s\" failed, ret = %d\n",
2077 				__func__, overlay_name, ret);
2078 		}
2079 		of_unittest_untrack_overlay(save_ovcs_id);
2080 	}
2081 
2082 }
2083 
2084 static int __init of_unittest_apply_overlay(int overlay_nr, int *ovcs_id)
2085 {
2086 	/*
2087 	 * The overlay will be tracked, thus it will be removed
2088 	 * by of_unittest_remove_tracked_overlays().
2089 	 */
2090 
2091 	const char *overlay_name;
2092 
2093 	overlay_name = overlay_name_from_nr(overlay_nr);
2094 
2095 	if (!overlay_data_apply(overlay_name, ovcs_id)) {
2096 		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
2097 		return -EFAULT;
2098 	}
2099 	of_unittest_track_overlay(*ovcs_id, overlay_nr);
2100 
2101 	return 0;
2102 }
2103 
2104 /* apply an overlay while checking before and after states */
2105 static int __init of_unittest_apply_overlay_check(int overlay_nr,
2106 		int unittest_nr, int before, int after,
2107 		enum overlay_type ovtype)
2108 {
2109 	int ret, ovcs_id;
2110 
2111 	/* unittest device must not be in before state */
2112 	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
2113 		unittest(0, "%s with device @\"%s\" %s\n",
2114 				overlay_name_from_nr(overlay_nr),
2115 				unittest_path(unittest_nr, ovtype),
2116 				!before ? "enabled" : "disabled");
2117 		return -EINVAL;
2118 	}
2119 
2120 	ovcs_id = 0;
2121 	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
2122 	if (ret != 0) {
2123 		/* of_unittest_apply_overlay already called unittest() */
2124 		return ret;
2125 	}
2126 
2127 	/* unittest device must be to set to after state */
2128 	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
2129 		unittest(0, "%s failed to create @\"%s\" %s\n",
2130 				overlay_name_from_nr(overlay_nr),
2131 				unittest_path(unittest_nr, ovtype),
2132 				!after ? "enabled" : "disabled");
2133 		return -EINVAL;
2134 	}
2135 
2136 	return 0;
2137 }
2138 
2139 /* apply an overlay and then revert it while checking before, after states */
2140 static int __init of_unittest_apply_revert_overlay_check(int overlay_nr,
2141 		int unittest_nr, int before, int after,
2142 		enum overlay_type ovtype)
2143 {
2144 	int ret, ovcs_id, save_ovcs_id;
2145 
2146 	/* unittest device must be in before state */
2147 	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
2148 		unittest(0, "%s with device @\"%s\" %s\n",
2149 				overlay_name_from_nr(overlay_nr),
2150 				unittest_path(unittest_nr, ovtype),
2151 				!before ? "enabled" : "disabled");
2152 		return -EINVAL;
2153 	}
2154 
2155 	/* apply the overlay */
2156 	ovcs_id = 0;
2157 	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
2158 	if (ret != 0) {
2159 		/* of_unittest_apply_overlay already called unittest() */
2160 		return ret;
2161 	}
2162 
2163 	/* unittest device must be in after state */
2164 	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
2165 		unittest(0, "%s failed to create @\"%s\" %s\n",
2166 				overlay_name_from_nr(overlay_nr),
2167 				unittest_path(unittest_nr, ovtype),
2168 				!after ? "enabled" : "disabled");
2169 		return -EINVAL;
2170 	}
2171 
2172 	save_ovcs_id = ovcs_id;
2173 	ret = of_overlay_remove(&ovcs_id);
2174 	if (ret != 0) {
2175 		unittest(0, "%s failed to be destroyed @\"%s\"\n",
2176 				overlay_name_from_nr(overlay_nr),
2177 				unittest_path(unittest_nr, ovtype));
2178 		return ret;
2179 	}
2180 	of_unittest_untrack_overlay(save_ovcs_id);
2181 
2182 	/* unittest device must be again in before state */
2183 	if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
2184 		unittest(0, "%s with device @\"%s\" %s\n",
2185 				overlay_name_from_nr(overlay_nr),
2186 				unittest_path(unittest_nr, ovtype),
2187 				!before ? "enabled" : "disabled");
2188 		return -EINVAL;
2189 	}
2190 
2191 	return 0;
2192 }
2193 
2194 /* test activation of device */
2195 static void __init of_unittest_overlay_0(void)
2196 {
2197 	int ret;
2198 
2199 	EXPECT_BEGIN(KERN_INFO,
2200 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest0/status");
2201 
2202 	/* device should enable */
2203 	ret = of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
2204 
2205 	EXPECT_END(KERN_INFO,
2206 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest0/status");
2207 
2208 	if (ret)
2209 		return;
2210 
2211 	unittest(1, "overlay test %d passed\n", 0);
2212 }
2213 
2214 /* test deactivation of device */
2215 static void __init of_unittest_overlay_1(void)
2216 {
2217 	int ret;
2218 
2219 	EXPECT_BEGIN(KERN_INFO,
2220 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest1/status");
2221 
2222 	/* device should disable */
2223 	ret = of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
2224 
2225 	EXPECT_END(KERN_INFO,
2226 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest1/status");
2227 
2228 	if (ret)
2229 		return;
2230 
2231 	unittest(1, "overlay test %d passed\n", 1);
2232 
2233 }
2234 
2235 /* test activation of device */
2236 static void __init of_unittest_overlay_2(void)
2237 {
2238 	int ret;
2239 
2240 	EXPECT_BEGIN(KERN_INFO,
2241 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest2/status");
2242 
2243 	/* device should enable */
2244 	ret = of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
2245 
2246 	EXPECT_END(KERN_INFO,
2247 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest2/status");
2248 
2249 	if (ret)
2250 		return;
2251 	unittest(1, "overlay test %d passed\n", 2);
2252 }
2253 
2254 /* test deactivation of device */
2255 static void __init of_unittest_overlay_3(void)
2256 {
2257 	int ret;
2258 
2259 	EXPECT_BEGIN(KERN_INFO,
2260 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest3/status");
2261 
2262 	/* device should disable */
2263 	ret = of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
2264 
2265 	EXPECT_END(KERN_INFO,
2266 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest3/status");
2267 
2268 	if (ret)
2269 		return;
2270 
2271 	unittest(1, "overlay test %d passed\n", 3);
2272 }
2273 
2274 /* test activation of a full device node */
2275 static void __init of_unittest_overlay_4(void)
2276 {
2277 	/* device should disable */
2278 	if (of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY))
2279 		return;
2280 
2281 	unittest(1, "overlay test %d passed\n", 4);
2282 }
2283 
2284 /* test overlay apply/revert sequence */
2285 static void __init of_unittest_overlay_5(void)
2286 {
2287 	int ret;
2288 
2289 	EXPECT_BEGIN(KERN_INFO,
2290 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest5/status");
2291 
2292 	/* device should disable */
2293 	ret = of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
2294 
2295 	EXPECT_END(KERN_INFO,
2296 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest5/status");
2297 
2298 	if (ret)
2299 		return;
2300 
2301 	unittest(1, "overlay test %d passed\n", 5);
2302 }
2303 
2304 /* test overlay application in sequence */
2305 static void __init of_unittest_overlay_6(void)
2306 {
2307 	int i, save_ovcs_id[2], ovcs_id;
2308 	int overlay_nr = 6, unittest_nr = 6;
2309 	int before = 0, after = 1;
2310 	const char *overlay_name;
2311 
2312 	int ret;
2313 
2314 	/* unittest device must be in before state */
2315 	for (i = 0; i < 2; i++) {
2316 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
2317 				!= before) {
2318 			unittest(0, "%s with device @\"%s\" %s\n",
2319 					overlay_name_from_nr(overlay_nr + i),
2320 					unittest_path(unittest_nr + i,
2321 						PDEV_OVERLAY),
2322 					!before ? "enabled" : "disabled");
2323 			return;
2324 		}
2325 	}
2326 
2327 	/* apply the overlays */
2328 
2329 	EXPECT_BEGIN(KERN_INFO,
2330 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status");
2331 
2332 	overlay_name = overlay_name_from_nr(overlay_nr + 0);
2333 
2334 	ret = overlay_data_apply(overlay_name, &ovcs_id);
2335 
2336 	if (!ret) {
2337 		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
2338 			return;
2339 	}
2340 	save_ovcs_id[0] = ovcs_id;
2341 	of_unittest_track_overlay(ovcs_id, overlay_nr + 0);
2342 
2343 	EXPECT_END(KERN_INFO,
2344 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status");
2345 
2346 	EXPECT_BEGIN(KERN_INFO,
2347 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status");
2348 
2349 	overlay_name = overlay_name_from_nr(overlay_nr + 1);
2350 
2351 	ret = overlay_data_apply(overlay_name, &ovcs_id);
2352 
2353 	if (!ret) {
2354 		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
2355 			return;
2356 	}
2357 	save_ovcs_id[1] = ovcs_id;
2358 	of_unittest_track_overlay(ovcs_id, overlay_nr + 1);
2359 
2360 	EXPECT_END(KERN_INFO,
2361 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status");
2362 
2363 
2364 	for (i = 0; i < 2; i++) {
2365 		/* unittest device must be in after state */
2366 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
2367 				!= after) {
2368 			unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
2369 					overlay_name_from_nr(overlay_nr + i),
2370 					unittest_path(unittest_nr + i,
2371 						PDEV_OVERLAY),
2372 					!after ? "enabled" : "disabled");
2373 			return;
2374 		}
2375 	}
2376 
2377 	for (i = 1; i >= 0; i--) {
2378 		ovcs_id = save_ovcs_id[i];
2379 		if (of_overlay_remove(&ovcs_id)) {
2380 			unittest(0, "%s failed destroy @\"%s\"\n",
2381 					overlay_name_from_nr(overlay_nr + i),
2382 					unittest_path(unittest_nr + i,
2383 						PDEV_OVERLAY));
2384 			return;
2385 		}
2386 		of_unittest_untrack_overlay(save_ovcs_id[i]);
2387 	}
2388 
2389 	for (i = 0; i < 2; i++) {
2390 		/* unittest device must be again in before state */
2391 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
2392 				!= before) {
2393 			unittest(0, "%s with device @\"%s\" %s\n",
2394 					overlay_name_from_nr(overlay_nr + i),
2395 					unittest_path(unittest_nr + i,
2396 						PDEV_OVERLAY),
2397 					!before ? "enabled" : "disabled");
2398 			return;
2399 		}
2400 	}
2401 
2402 	unittest(1, "overlay test %d passed\n", 6);
2403 
2404 }
2405 
2406 /* test overlay application in sequence */
2407 static void __init of_unittest_overlay_8(void)
2408 {
2409 	int i, save_ovcs_id[2], ovcs_id;
2410 	int overlay_nr = 8, unittest_nr = 8;
2411 	const char *overlay_name;
2412 	int ret;
2413 
2414 	/* we don't care about device state in this test */
2415 
2416 	EXPECT_BEGIN(KERN_INFO,
2417 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/status");
2418 
2419 	overlay_name = overlay_name_from_nr(overlay_nr + 0);
2420 
2421 	ret = overlay_data_apply(overlay_name, &ovcs_id);
2422 	if (!ret)
2423 		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
2424 
2425 	EXPECT_END(KERN_INFO,
2426 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/status");
2427 
2428 	if (!ret)
2429 		return;
2430 
2431 	save_ovcs_id[0] = ovcs_id;
2432 	of_unittest_track_overlay(ovcs_id, overlay_nr + 0);
2433 
2434 	overlay_name = overlay_name_from_nr(overlay_nr + 1);
2435 
2436 	EXPECT_BEGIN(KERN_INFO,
2437 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/property-foo");
2438 
2439 	/* apply the overlays */
2440 	ret = overlay_data_apply(overlay_name, &ovcs_id);
2441 
2442 	EXPECT_END(KERN_INFO,
2443 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/property-foo");
2444 
2445 	if (!ret) {
2446 		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
2447 		return;
2448 	}
2449 
2450 	save_ovcs_id[1] = ovcs_id;
2451 	of_unittest_track_overlay(ovcs_id, overlay_nr + 1);
2452 
2453 	/* now try to remove first overlay (it should fail) */
2454 	ovcs_id = save_ovcs_id[0];
2455 
2456 	EXPECT_BEGIN(KERN_INFO,
2457 		     "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8");
2458 
2459 	EXPECT_BEGIN(KERN_INFO,
2460 		     "OF: overlay: overlay #6 is not topmost");
2461 
2462 	ret = of_overlay_remove(&ovcs_id);
2463 
2464 	EXPECT_END(KERN_INFO,
2465 		   "OF: overlay: overlay #6 is not topmost");
2466 
2467 	EXPECT_END(KERN_INFO,
2468 		   "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8");
2469 
2470 	if (!ret) {
2471 		/*
2472 		 * Should never get here.  If we do, expect a lot of
2473 		 * subsequent tracking and overlay removal related errors.
2474 		 */
2475 		unittest(0, "%s was destroyed @\"%s\"\n",
2476 				overlay_name_from_nr(overlay_nr + 0),
2477 				unittest_path(unittest_nr,
2478 					PDEV_OVERLAY));
2479 		return;
2480 	}
2481 
2482 	/* removing them in order should work */
2483 	for (i = 1; i >= 0; i--) {
2484 		ovcs_id = save_ovcs_id[i];
2485 		if (of_overlay_remove(&ovcs_id)) {
2486 			unittest(0, "%s not destroyed @\"%s\"\n",
2487 					overlay_name_from_nr(overlay_nr + i),
2488 					unittest_path(unittest_nr,
2489 						PDEV_OVERLAY));
2490 			return;
2491 		}
2492 		of_unittest_untrack_overlay(save_ovcs_id[i]);
2493 	}
2494 
2495 	unittest(1, "overlay test %d passed\n", 8);
2496 }
2497 
2498 /* test insertion of a bus with parent devices */
2499 static void __init of_unittest_overlay_10(void)
2500 {
2501 	int ret;
2502 	char *child_path;
2503 
2504 	/* device should disable */
2505 	ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
2506 
2507 	if (unittest(ret == 0,
2508 			"overlay test %d failed; overlay application\n", 10))
2509 		return;
2510 
2511 	child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
2512 			unittest_path(10, PDEV_OVERLAY));
2513 	if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
2514 		return;
2515 
2516 	ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
2517 	kfree(child_path);
2518 
2519 	unittest(ret, "overlay test %d failed; no child device\n", 10);
2520 }
2521 
2522 /* test insertion of a bus with parent devices (and revert) */
2523 static void __init of_unittest_overlay_11(void)
2524 {
2525 	int ret;
2526 
2527 	/* device should disable */
2528 	ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
2529 			PDEV_OVERLAY);
2530 
2531 	unittest(ret == 0, "overlay test %d failed; overlay apply\n", 11);
2532 }
2533 
2534 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
2535 
2536 struct unittest_i2c_bus_data {
2537 	struct platform_device	*pdev;
2538 	struct i2c_adapter	adap;
2539 };
2540 
2541 static int unittest_i2c_master_xfer(struct i2c_adapter *adap,
2542 		struct i2c_msg *msgs, int num)
2543 {
2544 	struct unittest_i2c_bus_data *std = i2c_get_adapdata(adap);
2545 
2546 	(void)std;
2547 
2548 	return num;
2549 }
2550 
2551 static u32 unittest_i2c_functionality(struct i2c_adapter *adap)
2552 {
2553 	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
2554 }
2555 
2556 static const struct i2c_algorithm unittest_i2c_algo = {
2557 	.master_xfer	= unittest_i2c_master_xfer,
2558 	.functionality	= unittest_i2c_functionality,
2559 };
2560 
2561 static int unittest_i2c_bus_probe(struct platform_device *pdev)
2562 {
2563 	struct device *dev = &pdev->dev;
2564 	struct device_node *np = dev->of_node;
2565 	struct unittest_i2c_bus_data *std;
2566 	struct i2c_adapter *adap;
2567 	int ret;
2568 
2569 	if (np == NULL) {
2570 		dev_err(dev, "No OF data for device\n");
2571 		return -EINVAL;
2572 
2573 	}
2574 
2575 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2576 
2577 	std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
2578 	if (!std)
2579 		return -ENOMEM;
2580 
2581 	/* link them together */
2582 	std->pdev = pdev;
2583 	platform_set_drvdata(pdev, std);
2584 
2585 	adap = &std->adap;
2586 	i2c_set_adapdata(adap, std);
2587 	adap->nr = -1;
2588 	strscpy(adap->name, pdev->name, sizeof(adap->name));
2589 	adap->class = I2C_CLASS_DEPRECATED;
2590 	adap->algo = &unittest_i2c_algo;
2591 	adap->dev.parent = dev;
2592 	adap->dev.of_node = dev->of_node;
2593 	adap->timeout = 5 * HZ;
2594 	adap->retries = 3;
2595 
2596 	ret = i2c_add_numbered_adapter(adap);
2597 	if (ret != 0) {
2598 		dev_err(dev, "Failed to add I2C adapter\n");
2599 		return ret;
2600 	}
2601 
2602 	return 0;
2603 }
2604 
2605 static void unittest_i2c_bus_remove(struct platform_device *pdev)
2606 {
2607 	struct device *dev = &pdev->dev;
2608 	struct device_node *np = dev->of_node;
2609 	struct unittest_i2c_bus_data *std = platform_get_drvdata(pdev);
2610 
2611 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2612 	i2c_del_adapter(&std->adap);
2613 }
2614 
2615 static const struct of_device_id unittest_i2c_bus_match[] = {
2616 	{ .compatible = "unittest-i2c-bus", },
2617 	{},
2618 };
2619 
2620 static struct platform_driver unittest_i2c_bus_driver = {
2621 	.probe			= unittest_i2c_bus_probe,
2622 	.remove_new		= unittest_i2c_bus_remove,
2623 	.driver = {
2624 		.name		= "unittest-i2c-bus",
2625 		.of_match_table	= of_match_ptr(unittest_i2c_bus_match),
2626 	},
2627 };
2628 
2629 static int unittest_i2c_dev_probe(struct i2c_client *client)
2630 {
2631 	struct device *dev = &client->dev;
2632 	struct device_node *np = client->dev.of_node;
2633 
2634 	if (!np) {
2635 		dev_err(dev, "No OF node\n");
2636 		return -EINVAL;
2637 	}
2638 
2639 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2640 
2641 	return 0;
2642 };
2643 
2644 static void unittest_i2c_dev_remove(struct i2c_client *client)
2645 {
2646 	struct device *dev = &client->dev;
2647 	struct device_node *np = client->dev.of_node;
2648 
2649 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2650 }
2651 
2652 static const struct i2c_device_id unittest_i2c_dev_id[] = {
2653 	{ .name = "unittest-i2c-dev" },
2654 	{ }
2655 };
2656 
2657 static struct i2c_driver unittest_i2c_dev_driver = {
2658 	.driver = {
2659 		.name = "unittest-i2c-dev",
2660 	},
2661 	.probe = unittest_i2c_dev_probe,
2662 	.remove = unittest_i2c_dev_remove,
2663 	.id_table = unittest_i2c_dev_id,
2664 };
2665 
2666 #if IS_BUILTIN(CONFIG_I2C_MUX)
2667 
2668 static int unittest_i2c_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
2669 {
2670 	return 0;
2671 }
2672 
2673 static int unittest_i2c_mux_probe(struct i2c_client *client)
2674 {
2675 	int i, nchans;
2676 	struct device *dev = &client->dev;
2677 	struct i2c_adapter *adap = client->adapter;
2678 	struct device_node *np = client->dev.of_node, *child;
2679 	struct i2c_mux_core *muxc;
2680 	u32 reg, max_reg;
2681 
2682 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2683 
2684 	if (!np) {
2685 		dev_err(dev, "No OF node\n");
2686 		return -EINVAL;
2687 	}
2688 
2689 	max_reg = (u32)-1;
2690 	for_each_child_of_node(np, child) {
2691 		if (of_property_read_u32(child, "reg", &reg))
2692 			continue;
2693 		if (max_reg == (u32)-1 || reg > max_reg)
2694 			max_reg = reg;
2695 	}
2696 	nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
2697 	if (nchans == 0) {
2698 		dev_err(dev, "No channels\n");
2699 		return -EINVAL;
2700 	}
2701 
2702 	muxc = i2c_mux_alloc(adap, dev, nchans, 0, 0,
2703 			     unittest_i2c_mux_select_chan, NULL);
2704 	if (!muxc)
2705 		return -ENOMEM;
2706 	for (i = 0; i < nchans; i++) {
2707 		if (i2c_mux_add_adapter(muxc, 0, i, 0)) {
2708 			dev_err(dev, "Failed to register mux #%d\n", i);
2709 			i2c_mux_del_adapters(muxc);
2710 			return -ENODEV;
2711 		}
2712 	}
2713 
2714 	i2c_set_clientdata(client, muxc);
2715 
2716 	return 0;
2717 };
2718 
2719 static void unittest_i2c_mux_remove(struct i2c_client *client)
2720 {
2721 	struct device *dev = &client->dev;
2722 	struct device_node *np = client->dev.of_node;
2723 	struct i2c_mux_core *muxc = i2c_get_clientdata(client);
2724 
2725 	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
2726 	i2c_mux_del_adapters(muxc);
2727 }
2728 
2729 static const struct i2c_device_id unittest_i2c_mux_id[] = {
2730 	{ .name = "unittest-i2c-mux" },
2731 	{ }
2732 };
2733 
2734 static struct i2c_driver unittest_i2c_mux_driver = {
2735 	.driver = {
2736 		.name = "unittest-i2c-mux",
2737 	},
2738 	.probe = unittest_i2c_mux_probe,
2739 	.remove = unittest_i2c_mux_remove,
2740 	.id_table = unittest_i2c_mux_id,
2741 };
2742 
2743 #endif
2744 
2745 static int of_unittest_overlay_i2c_init(void)
2746 {
2747 	int ret;
2748 
2749 	ret = i2c_add_driver(&unittest_i2c_dev_driver);
2750 	if (unittest(ret == 0,
2751 			"could not register unittest i2c device driver\n"))
2752 		return ret;
2753 
2754 	ret = platform_driver_register(&unittest_i2c_bus_driver);
2755 
2756 	if (unittest(ret == 0,
2757 			"could not register unittest i2c bus driver\n"))
2758 		return ret;
2759 
2760 #if IS_BUILTIN(CONFIG_I2C_MUX)
2761 
2762 	EXPECT_BEGIN(KERN_INFO,
2763 		     "i2c i2c-1: Added multiplexed i2c bus 2");
2764 
2765 	ret = i2c_add_driver(&unittest_i2c_mux_driver);
2766 
2767 	EXPECT_END(KERN_INFO,
2768 		   "i2c i2c-1: Added multiplexed i2c bus 2");
2769 
2770 	if (unittest(ret == 0,
2771 			"could not register unittest i2c mux driver\n"))
2772 		return ret;
2773 #endif
2774 
2775 	return 0;
2776 }
2777 
2778 static void of_unittest_overlay_i2c_cleanup(void)
2779 {
2780 #if IS_BUILTIN(CONFIG_I2C_MUX)
2781 	i2c_del_driver(&unittest_i2c_mux_driver);
2782 #endif
2783 	platform_driver_unregister(&unittest_i2c_bus_driver);
2784 	i2c_del_driver(&unittest_i2c_dev_driver);
2785 }
2786 
2787 static void __init of_unittest_overlay_i2c_12(void)
2788 {
2789 	int ret;
2790 
2791 	/* device should enable */
2792 	EXPECT_BEGIN(KERN_INFO,
2793 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12/status");
2794 
2795 	ret = of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
2796 
2797 	EXPECT_END(KERN_INFO,
2798 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12/status");
2799 
2800 	if (ret)
2801 		return;
2802 
2803 	unittest(1, "overlay test %d passed\n", 12);
2804 }
2805 
2806 /* test deactivation of device */
2807 static void __init of_unittest_overlay_i2c_13(void)
2808 {
2809 	int ret;
2810 
2811 	EXPECT_BEGIN(KERN_INFO,
2812 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13/status");
2813 
2814 	/* device should disable */
2815 	ret = of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
2816 
2817 	EXPECT_END(KERN_INFO,
2818 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13/status");
2819 
2820 	if (ret)
2821 		return;
2822 
2823 	unittest(1, "overlay test %d passed\n", 13);
2824 }
2825 
2826 /* just check for i2c mux existence */
2827 static void of_unittest_overlay_i2c_14(void)
2828 {
2829 }
2830 
2831 static void __init of_unittest_overlay_i2c_15(void)
2832 {
2833 	int ret;
2834 
2835 	/* device should enable */
2836 	EXPECT_BEGIN(KERN_INFO,
2837 		     "i2c i2c-1: Added multiplexed i2c bus 3");
2838 
2839 	ret = of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY);
2840 
2841 	EXPECT_END(KERN_INFO,
2842 		   "i2c i2c-1: Added multiplexed i2c bus 3");
2843 
2844 	if (ret)
2845 		return;
2846 
2847 	unittest(1, "overlay test %d passed\n", 15);
2848 }
2849 
2850 #else
2851 
2852 static inline void of_unittest_overlay_i2c_14(void) { }
2853 static inline void of_unittest_overlay_i2c_15(void) { }
2854 
2855 #endif
2856 
2857 static int of_notify(struct notifier_block *nb, unsigned long action,
2858 		     void *arg)
2859 {
2860 	struct of_overlay_notify_data *nd = arg;
2861 	struct device_node *found;
2862 	int ret;
2863 
2864 	/*
2865 	 * For overlay_16 .. overlay_19, check that returning an error
2866 	 * works for each of the actions by setting an arbitrary return
2867 	 * error number that matches the test number.  e.g. for unittest16,
2868 	 * ret = -EBUSY which is -16.
2869 	 *
2870 	 * OVERLAY_INFO() for the overlays is declared to expect the same
2871 	 * error number, so overlay_data_apply() will return no error.
2872 	 *
2873 	 * overlay_20 will return NOTIFY_DONE
2874 	 */
2875 
2876 	ret = 0;
2877 	of_node_get(nd->overlay);
2878 
2879 	switch (action) {
2880 
2881 	case OF_OVERLAY_PRE_APPLY:
2882 		found = of_find_node_by_name(nd->overlay, "test-unittest16");
2883 		if (found) {
2884 			of_node_put(found);
2885 			ret = -EBUSY;
2886 		}
2887 		break;
2888 
2889 	case OF_OVERLAY_POST_APPLY:
2890 		found = of_find_node_by_name(nd->overlay, "test-unittest17");
2891 		if (found) {
2892 			of_node_put(found);
2893 			ret = -EEXIST;
2894 		}
2895 		break;
2896 
2897 	case OF_OVERLAY_PRE_REMOVE:
2898 		found = of_find_node_by_name(nd->overlay, "test-unittest18");
2899 		if (found) {
2900 			of_node_put(found);
2901 			ret = -EXDEV;
2902 		}
2903 		break;
2904 
2905 	case OF_OVERLAY_POST_REMOVE:
2906 		found = of_find_node_by_name(nd->overlay, "test-unittest19");
2907 		if (found) {
2908 			of_node_put(found);
2909 			ret = -ENODEV;
2910 		}
2911 		break;
2912 
2913 	default:			/* should not happen */
2914 		of_node_put(nd->overlay);
2915 		ret = -EINVAL;
2916 		break;
2917 	}
2918 
2919 	if (ret)
2920 		return notifier_from_errno(ret);
2921 
2922 	return NOTIFY_DONE;
2923 }
2924 
2925 static struct notifier_block of_nb = {
2926 	.notifier_call = of_notify,
2927 };
2928 
2929 static void __init of_unittest_overlay_notify(void)
2930 {
2931 	int ovcs_id;
2932 	int ret;
2933 
2934 	ret = of_overlay_notifier_register(&of_nb);
2935 	unittest(!ret,
2936 		 "of_overlay_notifier_register() failed, ret = %d\n", ret);
2937 	if (ret)
2938 		return;
2939 
2940 	/*
2941 	 * The overlays are applied by overlay_data_apply()
2942 	 * instead of of_unittest_apply_overlay() so that they
2943 	 * will not be tracked.  Thus they will not be removed
2944 	 * by of_unittest_remove_tracked_overlays().
2945 	 *
2946 	 * Applying overlays 16 - 19 will each trigger an error for a
2947 	 * different action in of_notify().
2948 	 *
2949 	 * Applying overlay 20 will not trigger any error in of_notify().
2950 	 */
2951 
2952 	/* ---  overlay 16  --- */
2953 
2954 	EXPECT_BEGIN(KERN_INFO, "OF: overlay: overlay changeset pre-apply notifier error -16, target: /testcase-data/overlay-node/test-bus");
2955 
2956 	unittest(overlay_data_apply("overlay_16", &ovcs_id),
2957 		 "test OF_OVERLAY_PRE_APPLY notify injected error\n");
2958 
2959 	EXPECT_END(KERN_INFO, "OF: overlay: overlay changeset pre-apply notifier error -16, target: /testcase-data/overlay-node/test-bus");
2960 
2961 	unittest(ovcs_id, "ovcs_id not created for overlay_16\n");
2962 
2963 	/* ---  overlay 17  --- */
2964 
2965 	EXPECT_BEGIN(KERN_INFO, "OF: overlay: overlay changeset post-apply notifier error -17, target: /testcase-data/overlay-node/test-bus");
2966 
2967 	unittest(overlay_data_apply("overlay_17", &ovcs_id),
2968 		 "test OF_OVERLAY_POST_APPLY notify injected error\n");
2969 
2970 	EXPECT_END(KERN_INFO, "OF: overlay: overlay changeset post-apply notifier error -17, target: /testcase-data/overlay-node/test-bus");
2971 
2972 	unittest(ovcs_id, "ovcs_id not created for overlay_17\n");
2973 
2974 	if (ovcs_id) {
2975 		ret = of_overlay_remove(&ovcs_id);
2976 		unittest(!ret,
2977 			"overlay_17 of_overlay_remove(), ret = %d\n", ret);
2978 	}
2979 
2980 	/* ---  overlay 18  --- */
2981 
2982 	unittest(overlay_data_apply("overlay_18", &ovcs_id),
2983 		 "OF_OVERLAY_PRE_REMOVE notify injected error\n");
2984 
2985 	unittest(ovcs_id, "ovcs_id not created for overlay_18\n");
2986 
2987 	if (ovcs_id) {
2988 		EXPECT_BEGIN(KERN_INFO, "OF: overlay: overlay changeset pre-remove notifier error -18, target: /testcase-data/overlay-node/test-bus");
2989 
2990 		ret = of_overlay_remove(&ovcs_id);
2991 		EXPECT_END(KERN_INFO, "OF: overlay: overlay changeset pre-remove notifier error -18, target: /testcase-data/overlay-node/test-bus");
2992 		if (ret == -EXDEV) {
2993 			/*
2994 			 * change set ovcs_id should still exist
2995 			 */
2996 			unittest(1, "overlay_18 of_overlay_remove() injected error for OF_OVERLAY_PRE_REMOVE\n");
2997 		} else {
2998 			unittest(0, "overlay_18 of_overlay_remove() injected error for OF_OVERLAY_PRE_REMOVE not returned\n");
2999 		}
3000 	} else {
3001 		unittest(1, "ovcs_id not created for overlay_18\n");
3002 	}
3003 
3004 	unittest(ovcs_id, "ovcs_id removed for overlay_18\n");
3005 
3006 	/* ---  overlay 19  --- */
3007 
3008 	unittest(overlay_data_apply("overlay_19", &ovcs_id),
3009 		 "OF_OVERLAY_POST_REMOVE notify injected error\n");
3010 
3011 	unittest(ovcs_id, "ovcs_id not created for overlay_19\n");
3012 
3013 	if (ovcs_id) {
3014 		EXPECT_BEGIN(KERN_INFO, "OF: overlay: overlay changeset post-remove notifier error -19, target: /testcase-data/overlay-node/test-bus");
3015 		ret = of_overlay_remove(&ovcs_id);
3016 		EXPECT_END(KERN_INFO, "OF: overlay: overlay changeset post-remove notifier error -19, target: /testcase-data/overlay-node/test-bus");
3017 		if (ret == -ENODEV)
3018 			unittest(1, "overlay_19 of_overlay_remove() injected error for OF_OVERLAY_POST_REMOVE\n");
3019 		else
3020 			unittest(0, "overlay_19 of_overlay_remove() injected error for OF_OVERLAY_POST_REMOVE not returned\n");
3021 	} else {
3022 		unittest(1, "ovcs_id removed for overlay_19\n");
3023 	}
3024 
3025 	unittest(!ovcs_id, "changeset ovcs_id = %d not removed for overlay_19\n",
3026 		 ovcs_id);
3027 
3028 	/* ---  overlay 20  --- */
3029 
3030 	unittest(overlay_data_apply("overlay_20", &ovcs_id),
3031 		 "overlay notify no injected error\n");
3032 
3033 	if (ovcs_id) {
3034 		ret = of_overlay_remove(&ovcs_id);
3035 		if (ret)
3036 			unittest(1, "overlay_20 failed to be destroyed, ret = %d\n",
3037 				 ret);
3038 	} else {
3039 		unittest(1, "ovcs_id not created for overlay_20\n");
3040 	}
3041 
3042 	unittest(!of_overlay_notifier_unregister(&of_nb),
3043 		 "of_overlay_notifier_unregister() failed, ret = %d\n", ret);
3044 }
3045 
3046 static void __init of_unittest_overlay(void)
3047 {
3048 	struct device_node *bus_np = NULL;
3049 
3050 	if (platform_driver_register(&unittest_driver)) {
3051 		unittest(0, "could not register unittest driver\n");
3052 		goto out;
3053 	}
3054 
3055 	bus_np = of_find_node_by_path(bus_path);
3056 	if (bus_np == NULL) {
3057 		unittest(0, "could not find bus_path \"%s\"\n", bus_path);
3058 		goto out;
3059 	}
3060 
3061 	if (of_platform_default_populate(bus_np, NULL, NULL)) {
3062 		unittest(0, "could not populate bus @ \"%s\"\n", bus_path);
3063 		goto out;
3064 	}
3065 
3066 	if (!of_unittest_device_exists(100, PDEV_OVERLAY)) {
3067 		unittest(0, "could not find unittest0 @ \"%s\"\n",
3068 				unittest_path(100, PDEV_OVERLAY));
3069 		goto out;
3070 	}
3071 
3072 	if (of_unittest_device_exists(101, PDEV_OVERLAY)) {
3073 		unittest(0, "unittest1 @ \"%s\" should not exist\n",
3074 				unittest_path(101, PDEV_OVERLAY));
3075 		goto out;
3076 	}
3077 
3078 	unittest(1, "basic infrastructure of overlays passed");
3079 
3080 	/* tests in sequence */
3081 	of_unittest_overlay_0();
3082 	of_unittest_overlay_1();
3083 	of_unittest_overlay_2();
3084 	of_unittest_overlay_3();
3085 	of_unittest_overlay_4();
3086 	of_unittest_overlay_5();
3087 	of_unittest_overlay_6();
3088 	of_unittest_overlay_8();
3089 
3090 	of_unittest_overlay_10();
3091 	of_unittest_overlay_11();
3092 
3093 #if IS_BUILTIN(CONFIG_I2C)
3094 	if (unittest(of_unittest_overlay_i2c_init() == 0, "i2c init failed\n"))
3095 		goto out;
3096 
3097 	of_unittest_overlay_i2c_12();
3098 	of_unittest_overlay_i2c_13();
3099 	of_unittest_overlay_i2c_14();
3100 	of_unittest_overlay_i2c_15();
3101 
3102 	of_unittest_overlay_i2c_cleanup();
3103 #endif
3104 
3105 	of_unittest_overlay_gpio();
3106 
3107 	of_unittest_remove_tracked_overlays();
3108 
3109 	of_unittest_overlay_notify();
3110 
3111 out:
3112 	of_node_put(bus_np);
3113 }
3114 
3115 #else
3116 static inline void __init of_unittest_overlay(void) { }
3117 #endif
3118 
3119 static void __init of_unittest_lifecycle(void)
3120 {
3121 #ifdef CONFIG_OF_DYNAMIC
3122 	unsigned int refcount;
3123 	int found_refcount_one = 0;
3124 	int put_count = 0;
3125 	struct device_node *np;
3126 	struct device_node *prev_sibling, *next_sibling;
3127 	const char *refcount_path = "/testcase-data/refcount-node";
3128 	const char *refcount_parent_path = "/testcase-data";
3129 
3130 	/*
3131 	 * Node lifecycle tests, non-dynamic node:
3132 	 *
3133 	 * - Decrementing refcount to zero via of_node_put() should cause the
3134 	 *   attempt to free the node memory by of_node_release() to fail
3135 	 *   because the node is not a dynamic node.
3136 	 *
3137 	 * - Decrementing refcount past zero should result in additional
3138 	 *   errors reported.
3139 	 */
3140 
3141 	np = of_find_node_by_path(refcount_path);
3142 	unittest(np, "find refcount_path \"%s\"\n", refcount_path);
3143 	if (np == NULL)
3144 		goto out_skip_tests;
3145 
3146 	while (!found_refcount_one) {
3147 
3148 		if (put_count++ > 10) {
3149 			unittest(0, "guardrail to avoid infinite loop\n");
3150 			goto out_skip_tests;
3151 		}
3152 
3153 		refcount = kref_read(&np->kobj.kref);
3154 		if (refcount == 1)
3155 			found_refcount_one = 1;
3156 		else
3157 			of_node_put(np);
3158 	}
3159 
3160 	EXPECT_BEGIN(KERN_INFO, "OF: ERROR: of_node_release() detected bad of_node_put() on /testcase-data/refcount-node");
3161 
3162 	/*
3163 	 * refcount is now one, decrementing to zero will result in a call to
3164 	 * of_node_release() to free the node's memory, which should result
3165 	 * in an error
3166 	 */
3167 	unittest(1, "/testcase-data/refcount-node is one");
3168 	of_node_put(np);
3169 
3170 	EXPECT_END(KERN_INFO, "OF: ERROR: of_node_release() detected bad of_node_put() on /testcase-data/refcount-node");
3171 
3172 
3173 	/*
3174 	 * expect stack trace for subsequent of_node_put():
3175 	 *   __refcount_sub_and_test() calls:
3176 	 *   refcount_warn_saturate(r, REFCOUNT_SUB_UAF)
3177 	 *
3178 	 * Not capturing entire WARN_ONCE() trace with EXPECT_*(), just
3179 	 * the first three lines, and the last line.
3180 	 */
3181 	EXPECT_BEGIN(KERN_INFO, "------------[ cut here ]------------");
3182 	EXPECT_BEGIN(KERN_INFO, "WARNING: <<all>>");
3183 	EXPECT_BEGIN(KERN_INFO, "refcount_t: underflow; use-after-free.");
3184 	EXPECT_BEGIN(KERN_INFO, "---[ end trace <<int>> ]---");
3185 
3186 	/* refcount is now zero, this should fail */
3187 	unittest(1, "/testcase-data/refcount-node is zero");
3188 	of_node_put(np);
3189 
3190 	EXPECT_END(KERN_INFO, "---[ end trace <<int>> ]---");
3191 	EXPECT_END(KERN_INFO, "refcount_t: underflow; use-after-free.");
3192 	EXPECT_END(KERN_INFO, "WARNING: <<all>>");
3193 	EXPECT_END(KERN_INFO, "------------[ cut here ]------------");
3194 
3195 	/*
3196 	 * Q. do we expect to get yet another warning?
3197 	 * A. no, the WARNING is from WARN_ONCE()
3198 	 */
3199 	EXPECT_NOT_BEGIN(KERN_INFO, "------------[ cut here ]------------");
3200 	EXPECT_NOT_BEGIN(KERN_INFO, "WARNING: <<all>>");
3201 	EXPECT_NOT_BEGIN(KERN_INFO, "refcount_t: underflow; use-after-free.");
3202 	EXPECT_NOT_BEGIN(KERN_INFO, "---[ end trace <<int>> ]---");
3203 
3204 	unittest(1, "/testcase-data/refcount-node is zero, second time");
3205 	of_node_put(np);
3206 
3207 	EXPECT_NOT_END(KERN_INFO, "---[ end trace <<int>> ]---");
3208 	EXPECT_NOT_END(KERN_INFO, "refcount_t: underflow; use-after-free.");
3209 	EXPECT_NOT_END(KERN_INFO, "WARNING: <<all>>");
3210 	EXPECT_NOT_END(KERN_INFO, "------------[ cut here ]------------");
3211 
3212 	/*
3213 	 * refcount of zero will trigger stack traces from any further
3214 	 * attempt to of_node_get() node "refcount-node". One example of
3215 	 * this is where of_unittest_check_node_linkage() will recursively
3216 	 * scan the tree, with 'for_each_child_of_node()' doing an
3217 	 * of_node_get() of the children of a node.
3218 	 *
3219 	 * Prevent the stack trace by removing node "refcount-node" from
3220 	 * its parent's child list.
3221 	 *
3222 	 * WARNING:  EVIL, EVIL, EVIL:
3223 	 *
3224 	 *   Directly manipulate the child list of node /testcase-data to
3225 	 *   remove child refcount-node.  This is ignoring all proper methods
3226 	 *   of removing a child and will leak a small amount of memory.
3227 	 */
3228 
3229 	np = of_find_node_by_path(refcount_parent_path);
3230 	unittest(np, "find refcount_parent_path \"%s\"\n", refcount_parent_path);
3231 	unittest(np, "ERROR: devicetree live tree left in a 'bad state' if test fail\n");
3232 	if (np == NULL)
3233 		return;
3234 
3235 	prev_sibling = np->child;
3236 	next_sibling = prev_sibling->sibling;
3237 	if (!strcmp(prev_sibling->full_name, "refcount-node")) {
3238 		np->child = next_sibling;
3239 		next_sibling = next_sibling->sibling;
3240 	}
3241 	while (next_sibling) {
3242 		if (!strcmp(next_sibling->full_name, "refcount-node"))
3243 			prev_sibling->sibling = next_sibling->sibling;
3244 		prev_sibling = next_sibling;
3245 		next_sibling = next_sibling->sibling;
3246 	}
3247 	of_node_put(np);
3248 
3249 	return;
3250 
3251 out_skip_tests:
3252 #endif
3253 	unittest(0, "One or more lifecycle tests skipped\n");
3254 }
3255 
3256 #ifdef CONFIG_OF_OVERLAY
3257 
3258 /*
3259  * __dtbo_##overlay_name##_begin[] and __dtbo_##overlay_name##_end[] are
3260  * created by cmd_dt_S_dtbo in scripts/Makefile.lib
3261  */
3262 
3263 #define OVERLAY_INFO_EXTERN(overlay_name) \
3264 	extern uint8_t __dtbo_##overlay_name##_begin[]; \
3265 	extern uint8_t __dtbo_##overlay_name##_end[]
3266 
3267 #define OVERLAY_INFO(overlay_name, expected) \
3268 {	.dtbo_begin       = __dtbo_##overlay_name##_begin, \
3269 	.dtbo_end         = __dtbo_##overlay_name##_end, \
3270 	.expected_result = expected, \
3271 	.name            = #overlay_name, \
3272 }
3273 
3274 struct overlay_info {
3275 	uint8_t		*dtbo_begin;
3276 	uint8_t		*dtbo_end;
3277 	int		expected_result;
3278 	int		ovcs_id;
3279 	char		*name;
3280 };
3281 
3282 OVERLAY_INFO_EXTERN(overlay_base);
3283 OVERLAY_INFO_EXTERN(overlay);
3284 OVERLAY_INFO_EXTERN(overlay_0);
3285 OVERLAY_INFO_EXTERN(overlay_1);
3286 OVERLAY_INFO_EXTERN(overlay_2);
3287 OVERLAY_INFO_EXTERN(overlay_3);
3288 OVERLAY_INFO_EXTERN(overlay_4);
3289 OVERLAY_INFO_EXTERN(overlay_5);
3290 OVERLAY_INFO_EXTERN(overlay_6);
3291 OVERLAY_INFO_EXTERN(overlay_7);
3292 OVERLAY_INFO_EXTERN(overlay_8);
3293 OVERLAY_INFO_EXTERN(overlay_9);
3294 OVERLAY_INFO_EXTERN(overlay_10);
3295 OVERLAY_INFO_EXTERN(overlay_11);
3296 OVERLAY_INFO_EXTERN(overlay_12);
3297 OVERLAY_INFO_EXTERN(overlay_13);
3298 OVERLAY_INFO_EXTERN(overlay_15);
3299 OVERLAY_INFO_EXTERN(overlay_16);
3300 OVERLAY_INFO_EXTERN(overlay_17);
3301 OVERLAY_INFO_EXTERN(overlay_18);
3302 OVERLAY_INFO_EXTERN(overlay_19);
3303 OVERLAY_INFO_EXTERN(overlay_20);
3304 OVERLAY_INFO_EXTERN(overlay_gpio_01);
3305 OVERLAY_INFO_EXTERN(overlay_gpio_02a);
3306 OVERLAY_INFO_EXTERN(overlay_gpio_02b);
3307 OVERLAY_INFO_EXTERN(overlay_gpio_03);
3308 OVERLAY_INFO_EXTERN(overlay_gpio_04a);
3309 OVERLAY_INFO_EXTERN(overlay_gpio_04b);
3310 OVERLAY_INFO_EXTERN(overlay_bad_add_dup_node);
3311 OVERLAY_INFO_EXTERN(overlay_bad_add_dup_prop);
3312 OVERLAY_INFO_EXTERN(overlay_bad_phandle);
3313 OVERLAY_INFO_EXTERN(overlay_bad_symbol);
3314 
3315 /* entries found by name */
3316 static struct overlay_info overlays[] = {
3317 	OVERLAY_INFO(overlay_base, -9999),
3318 	OVERLAY_INFO(overlay, 0),
3319 	OVERLAY_INFO(overlay_0, 0),
3320 	OVERLAY_INFO(overlay_1, 0),
3321 	OVERLAY_INFO(overlay_2, 0),
3322 	OVERLAY_INFO(overlay_3, 0),
3323 	OVERLAY_INFO(overlay_4, 0),
3324 	OVERLAY_INFO(overlay_5, 0),
3325 	OVERLAY_INFO(overlay_6, 0),
3326 	OVERLAY_INFO(overlay_7, 0),
3327 	OVERLAY_INFO(overlay_8, 0),
3328 	OVERLAY_INFO(overlay_9, 0),
3329 	OVERLAY_INFO(overlay_10, 0),
3330 	OVERLAY_INFO(overlay_11, 0),
3331 	OVERLAY_INFO(overlay_12, 0),
3332 	OVERLAY_INFO(overlay_13, 0),
3333 	OVERLAY_INFO(overlay_15, 0),
3334 	OVERLAY_INFO(overlay_16, -EBUSY),
3335 	OVERLAY_INFO(overlay_17, -EEXIST),
3336 	OVERLAY_INFO(overlay_18, 0),
3337 	OVERLAY_INFO(overlay_19, 0),
3338 	OVERLAY_INFO(overlay_20, 0),
3339 	OVERLAY_INFO(overlay_gpio_01, 0),
3340 	OVERLAY_INFO(overlay_gpio_02a, 0),
3341 	OVERLAY_INFO(overlay_gpio_02b, 0),
3342 	OVERLAY_INFO(overlay_gpio_03, 0),
3343 	OVERLAY_INFO(overlay_gpio_04a, 0),
3344 	OVERLAY_INFO(overlay_gpio_04b, 0),
3345 	OVERLAY_INFO(overlay_bad_add_dup_node, -EINVAL),
3346 	OVERLAY_INFO(overlay_bad_add_dup_prop, -EINVAL),
3347 	OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
3348 	OVERLAY_INFO(overlay_bad_symbol, -EINVAL),
3349 	/* end marker */
3350 	{.dtbo_begin = NULL, .dtbo_end = NULL, .expected_result = 0, .name = NULL}
3351 };
3352 
3353 static struct device_node *overlay_base_root;
3354 
3355 static void * __init dt_alloc_memory(u64 size, u64 align)
3356 {
3357 	void *ptr = memblock_alloc(size, align);
3358 
3359 	if (!ptr)
3360 		panic("%s: Failed to allocate %llu bytes align=0x%llx\n",
3361 		      __func__, size, align);
3362 
3363 	return ptr;
3364 }
3365 
3366 /*
3367  * Create base device tree for the overlay unittest.
3368  *
3369  * This is called from very early boot code.
3370  *
3371  * Do as much as possible the same way as done in __unflatten_device_tree
3372  * and other early boot steps for the normal FDT so that the overlay base
3373  * unflattened tree will have the same characteristics as the real tree
3374  * (such as having memory allocated by the early allocator).  The goal
3375  * is to test "the real thing" as much as possible, and test "test setup
3376  * code" as little as possible.
3377  *
3378  * Have to stop before resolving phandles, because that uses kmalloc.
3379  */
3380 void __init unittest_unflatten_overlay_base(void)
3381 {
3382 	struct overlay_info *info;
3383 	u32 data_size;
3384 	void *new_fdt;
3385 	u32 size;
3386 	int found = 0;
3387 	const char *overlay_name = "overlay_base";
3388 
3389 	for (info = overlays; info && info->name; info++) {
3390 		if (!strcmp(overlay_name, info->name)) {
3391 			found = 1;
3392 			break;
3393 		}
3394 	}
3395 	if (!found) {
3396 		pr_err("no overlay data for %s\n", overlay_name);
3397 		return;
3398 	}
3399 
3400 	info = &overlays[0];
3401 
3402 	if (info->expected_result != -9999) {
3403 		pr_err("No dtb 'overlay_base' to attach\n");
3404 		return;
3405 	}
3406 
3407 	data_size = info->dtbo_end - info->dtbo_begin;
3408 	if (!data_size) {
3409 		pr_err("No dtb 'overlay_base' to attach\n");
3410 		return;
3411 	}
3412 
3413 	size = fdt_totalsize(info->dtbo_begin);
3414 	if (size != data_size) {
3415 		pr_err("dtb 'overlay_base' header totalsize != actual size");
3416 		return;
3417 	}
3418 
3419 	new_fdt = dt_alloc_memory(size, roundup_pow_of_two(FDT_V17_SIZE));
3420 	if (!new_fdt) {
3421 		pr_err("alloc for dtb 'overlay_base' failed");
3422 		return;
3423 	}
3424 
3425 	memcpy(new_fdt, info->dtbo_begin, size);
3426 
3427 	__unflatten_device_tree(new_fdt, NULL, &overlay_base_root,
3428 				dt_alloc_memory, true);
3429 }
3430 
3431 /*
3432  * The purpose of of_unittest_overlay_data_add is to add an
3433  * overlay in the normal fashion.  This is a test of the whole
3434  * picture, instead of testing individual elements.
3435  *
3436  * A secondary purpose is to be able to verify that the contents of
3437  * /proc/device-tree/ contains the updated structure and values from
3438  * the overlay.  That must be verified separately in user space.
3439  *
3440  * Return 0 on unexpected error.
3441  */
3442 static int __init overlay_data_apply(const char *overlay_name, int *ovcs_id)
3443 {
3444 	struct overlay_info *info;
3445 	int found = 0;
3446 	int ret;
3447 	u32 size;
3448 
3449 	for (info = overlays; info && info->name; info++) {
3450 		if (!strcmp(overlay_name, info->name)) {
3451 			found = 1;
3452 			break;
3453 		}
3454 	}
3455 	if (!found) {
3456 		pr_err("no overlay data for %s\n", overlay_name);
3457 		return 0;
3458 	}
3459 
3460 	size = info->dtbo_end - info->dtbo_begin;
3461 	if (!size)
3462 		pr_err("no overlay data for %s\n", overlay_name);
3463 
3464 	ret = of_overlay_fdt_apply(info->dtbo_begin, size, &info->ovcs_id);
3465 	if (ovcs_id)
3466 		*ovcs_id = info->ovcs_id;
3467 	if (ret < 0)
3468 		goto out;
3469 
3470 	pr_debug("%s applied\n", overlay_name);
3471 
3472 out:
3473 	if (ret != info->expected_result)
3474 		pr_err("of_overlay_fdt_apply() expected %d, ret=%d, %s\n",
3475 		       info->expected_result, ret, overlay_name);
3476 
3477 	return (ret == info->expected_result);
3478 }
3479 
3480 /*
3481  * The purpose of of_unittest_overlay_high_level is to add an overlay
3482  * in the normal fashion.  This is a test of the whole picture,
3483  * instead of individual elements.
3484  *
3485  * The first part of the function is _not_ normal overlay usage; it is
3486  * finishing splicing the base overlay device tree into the live tree.
3487  */
3488 static __init void of_unittest_overlay_high_level(void)
3489 {
3490 	struct device_node *last_sibling;
3491 	struct device_node *np;
3492 	struct device_node *of_symbols;
3493 	struct device_node *overlay_base_symbols;
3494 	struct device_node **pprev;
3495 	struct property *prop;
3496 	int ret;
3497 
3498 	if (!overlay_base_root) {
3499 		unittest(0, "overlay_base_root not initialized\n");
3500 		return;
3501 	}
3502 
3503 	/*
3504 	 * Could not fixup phandles in unittest_unflatten_overlay_base()
3505 	 * because kmalloc() was not yet available.
3506 	 */
3507 	of_overlay_mutex_lock();
3508 	of_resolve_phandles(overlay_base_root);
3509 	of_overlay_mutex_unlock();
3510 
3511 
3512 	/*
3513 	 * do not allow overlay_base to duplicate any node already in
3514 	 * tree, this greatly simplifies the code
3515 	 */
3516 
3517 	/*
3518 	 * remove overlay_base_root node "__local_fixups", after
3519 	 * being used by of_resolve_phandles()
3520 	 */
3521 	pprev = &overlay_base_root->child;
3522 	for (np = overlay_base_root->child; np; np = np->sibling) {
3523 		if (of_node_name_eq(np, "__local_fixups__")) {
3524 			*pprev = np->sibling;
3525 			break;
3526 		}
3527 		pprev = &np->sibling;
3528 	}
3529 
3530 	/* remove overlay_base_root node "__symbols__" if in live tree */
3531 	of_symbols = of_get_child_by_name(of_root, "__symbols__");
3532 	if (of_symbols) {
3533 		/* will have to graft properties from node into live tree */
3534 		pprev = &overlay_base_root->child;
3535 		for (np = overlay_base_root->child; np; np = np->sibling) {
3536 			if (of_node_name_eq(np, "__symbols__")) {
3537 				overlay_base_symbols = np;
3538 				*pprev = np->sibling;
3539 				break;
3540 			}
3541 			pprev = &np->sibling;
3542 		}
3543 	}
3544 
3545 	for_each_child_of_node(overlay_base_root, np) {
3546 		struct device_node *base_child;
3547 		for_each_child_of_node(of_root, base_child) {
3548 			if (!strcmp(np->full_name, base_child->full_name)) {
3549 				unittest(0, "illegal node name in overlay_base %pOFn",
3550 					 np);
3551 				of_node_put(np);
3552 				of_node_put(base_child);
3553 				return;
3554 			}
3555 		}
3556 	}
3557 
3558 	/*
3559 	 * overlay 'overlay_base' is not allowed to have root
3560 	 * properties, so only need to splice nodes into main device tree.
3561 	 *
3562 	 * root node of *overlay_base_root will not be freed, it is lost
3563 	 * memory.
3564 	 */
3565 
3566 	for (np = overlay_base_root->child; np; np = np->sibling)
3567 		np->parent = of_root;
3568 
3569 	mutex_lock(&of_mutex);
3570 
3571 	for (last_sibling = np = of_root->child; np; np = np->sibling)
3572 		last_sibling = np;
3573 
3574 	if (last_sibling)
3575 		last_sibling->sibling = overlay_base_root->child;
3576 	else
3577 		of_root->child = overlay_base_root->child;
3578 
3579 	for_each_of_allnodes_from(overlay_base_root, np)
3580 		__of_attach_node_sysfs(np);
3581 
3582 	if (of_symbols) {
3583 		struct property *new_prop;
3584 		for_each_property_of_node(overlay_base_symbols, prop) {
3585 
3586 			new_prop = __of_prop_dup(prop, GFP_KERNEL);
3587 			if (!new_prop) {
3588 				unittest(0, "__of_prop_dup() of '%s' from overlay_base node __symbols__",
3589 					 prop->name);
3590 				goto err_unlock;
3591 			}
3592 			if (__of_add_property(of_symbols, new_prop)) {
3593 				kfree(new_prop->name);
3594 				kfree(new_prop->value);
3595 				kfree(new_prop);
3596 				/* "name" auto-generated by unflatten */
3597 				if (!strcmp(prop->name, "name"))
3598 					continue;
3599 				unittest(0, "duplicate property '%s' in overlay_base node __symbols__",
3600 					 prop->name);
3601 				goto err_unlock;
3602 			}
3603 			if (__of_add_property_sysfs(of_symbols, new_prop)) {
3604 				unittest(0, "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
3605 					 prop->name);
3606 				goto err_unlock;
3607 			}
3608 		}
3609 	}
3610 
3611 	mutex_unlock(&of_mutex);
3612 
3613 
3614 	/* now do the normal overlay usage test */
3615 
3616 	EXPECT_BEGIN(KERN_ERR,
3617 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/status");
3618 	EXPECT_BEGIN(KERN_ERR,
3619 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/status");
3620 	EXPECT_BEGIN(KERN_ERR,
3621 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@30/incline-up");
3622 	EXPECT_BEGIN(KERN_ERR,
3623 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@40/incline-up");
3624 	EXPECT_BEGIN(KERN_ERR,
3625 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/status");
3626 	EXPECT_BEGIN(KERN_ERR,
3627 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/color");
3628 	EXPECT_BEGIN(KERN_ERR,
3629 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/rate");
3630 	EXPECT_BEGIN(KERN_ERR,
3631 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/hvac_2");
3632 	EXPECT_BEGIN(KERN_ERR,
3633 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200");
3634 	EXPECT_BEGIN(KERN_ERR,
3635 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_left");
3636 	EXPECT_BEGIN(KERN_ERR,
3637 		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_right");
3638 
3639 	ret = overlay_data_apply("overlay", NULL);
3640 
3641 	EXPECT_END(KERN_ERR,
3642 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_right");
3643 	EXPECT_END(KERN_ERR,
3644 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_left");
3645 	EXPECT_END(KERN_ERR,
3646 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200");
3647 	EXPECT_END(KERN_ERR,
3648 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/hvac_2");
3649 	EXPECT_END(KERN_ERR,
3650 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/rate");
3651 	EXPECT_END(KERN_ERR,
3652 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/color");
3653 	EXPECT_END(KERN_ERR,
3654 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/status");
3655 	EXPECT_END(KERN_ERR,
3656 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@40/incline-up");
3657 	EXPECT_END(KERN_ERR,
3658 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@30/incline-up");
3659 	EXPECT_END(KERN_ERR,
3660 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/status");
3661 	EXPECT_END(KERN_ERR,
3662 		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/status");
3663 
3664 	unittest(ret, "Adding overlay 'overlay' failed\n");
3665 
3666 	EXPECT_BEGIN(KERN_ERR,
3667 		     "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/controller");
3668 	EXPECT_BEGIN(KERN_ERR,
3669 		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/controller/name");
3670 
3671 	unittest(overlay_data_apply("overlay_bad_add_dup_node", NULL),
3672 		 "Adding overlay 'overlay_bad_add_dup_node' failed\n");
3673 
3674 	EXPECT_END(KERN_ERR,
3675 		   "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/controller/name");
3676 	EXPECT_END(KERN_ERR,
3677 		   "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/controller");
3678 
3679 	EXPECT_BEGIN(KERN_ERR,
3680 		     "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/electric");
3681 	EXPECT_BEGIN(KERN_ERR,
3682 		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/electric/rpm_avail");
3683 	EXPECT_BEGIN(KERN_ERR,
3684 		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/electric/name");
3685 
3686 	unittest(overlay_data_apply("overlay_bad_add_dup_prop", NULL),
3687 		 "Adding overlay 'overlay_bad_add_dup_prop' failed\n");
3688 
3689 	EXPECT_END(KERN_ERR,
3690 		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/electric/name");
3691 	EXPECT_END(KERN_ERR,
3692 		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/electric/rpm_avail");
3693 	EXPECT_END(KERN_ERR,
3694 		     "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/electric");
3695 
3696 	unittest(overlay_data_apply("overlay_bad_phandle", NULL),
3697 		 "Adding overlay 'overlay_bad_phandle' failed\n");
3698 
3699 	unittest(overlay_data_apply("overlay_bad_symbol", NULL),
3700 		 "Adding overlay 'overlay_bad_symbol' failed\n");
3701 
3702 	return;
3703 
3704 err_unlock:
3705 	mutex_unlock(&of_mutex);
3706 }
3707 
3708 #else
3709 
3710 static inline __init void of_unittest_overlay_high_level(void) {}
3711 
3712 #endif
3713 
3714 static int __init of_unittest(void)
3715 {
3716 	struct device_node *np;
3717 	int res;
3718 
3719 	pr_info("start of unittest - you will see error messages\n");
3720 
3721 	/* Taint the kernel so we know we've run tests. */
3722 	add_taint(TAINT_TEST, LOCKDEP_STILL_OK);
3723 
3724 	/* adding data for unittest */
3725 
3726 	if (IS_ENABLED(CONFIG_UML))
3727 		unittest_unflatten_overlay_base();
3728 
3729 	res = unittest_data_add();
3730 	if (res)
3731 		return res;
3732 	if (!of_aliases)
3733 		of_aliases = of_find_node_by_path("/aliases");
3734 
3735 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
3736 	if (!np) {
3737 		pr_info("No testcase data in device tree; not running tests\n");
3738 		return 0;
3739 	}
3740 	of_node_put(np);
3741 
3742 	of_unittest_check_tree_linkage();
3743 	of_unittest_check_phandles();
3744 	of_unittest_find_node_by_name();
3745 	of_unittest_dynamic();
3746 	of_unittest_parse_phandle_with_args();
3747 	of_unittest_parse_phandle_with_args_map();
3748 	of_unittest_printf();
3749 	of_unittest_property_string();
3750 	of_unittest_property_copy();
3751 	of_unittest_changeset();
3752 	of_unittest_parse_interrupts();
3753 	of_unittest_parse_interrupts_extended();
3754 	of_unittest_dma_get_max_cpu_address();
3755 	of_unittest_parse_dma_ranges();
3756 	of_unittest_pci_dma_ranges();
3757 	of_unittest_bus_ranges();
3758 	of_unittest_bus_3cell_ranges();
3759 	of_unittest_reg();
3760 	of_unittest_match_node();
3761 	of_unittest_platform_populate();
3762 	of_unittest_overlay();
3763 	of_unittest_lifecycle();
3764 
3765 	/* Double check linkage after removing testcase data */
3766 	of_unittest_check_tree_linkage();
3767 
3768 	of_unittest_overlay_high_level();
3769 
3770 	pr_info("end of unittest - %i passed, %i failed\n",
3771 		unittest_results.passed, unittest_results.failed);
3772 
3773 	return 0;
3774 }
3775 late_initcall(of_unittest);
3776