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