summaryrefslogtreecommitdiffstats
path: root/scripts/dtc/checks.c
blob: 95485796f253ffb0d2c413e50acf650fe397aece (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2007.
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

#include "dtc.h"

#ifdef TRACE_CHECKS
#define TRACE(c, ...) \
	do { \
		fprintf(stderr, "=== %s: ", (c)->name); \
		fprintf(stderr, __VA_ARGS__); \
		fprintf(stderr, "\n"); \
	} while (0)
#else
#define TRACE(c, fmt, ...)	do { } while (0)
#endif

enum checklevel {
	IGNORE = 0,
	WARN = 1,
	ERROR = 2,
};

enum checkstatus {
	UNCHECKED = 0,
	PREREQ,
	PASSED,
	FAILED,
};

struct check;

typedef void (*tree_check_fn)(struct check *c, struct node *dt);
typedef void (*node_check_fn)(struct check *c, struct node *dt, struct node *node);
typedef void (*prop_check_fn)(struct check *c, struct node *dt,
			      struct node *node, struct property *prop);

struct check {
	const char *name;
	tree_check_fn tree_fn;
	node_check_fn node_fn;
	prop_check_fn prop_fn;
	void *data;
	enum checklevel level;
	enum checkstatus status;
	int inprogress;
	int num_prereqs;
	struct check **prereq;
};

#define CHECK(nm, tfn, nfn, pfn, d, lvl, ...) \
	static struct check *nm##_prereqs[] = { __VA_ARGS__ }; \
	static struct check nm = { \
		.name = #nm, \
		.tree_fn = (tfn), \
		.node_fn = (nfn), \
		.prop_fn = (pfn), \
		.data = (d), \
		.level = (lvl), \
		.status = UNCHECKED, \
		.num_prereqs = ARRAY_SIZE(nm##_prereqs), \
		.prereq = nm##_prereqs, \
	};

#define TREE_CHECK(nm, d, lvl, ...) \
	CHECK(nm, check_##nm, NULL, NULL, d, lvl, __VA_ARGS__)
#define NODE_CHECK(nm, d, lvl, ...) \
	CHECK(nm, NULL, check_##nm, NULL, d, lvl, __VA_ARGS__)
#define PROP_CHECK(nm, d, lvl, ...) \
	CHECK(nm, NULL, NULL, check_##nm, d, lvl, __VA_ARGS__)
#define BATCH_CHECK(nm, lvl, ...) \
	CHECK(nm, NULL, NULL, NULL, NULL, lvl, __VA_ARGS__)

#ifdef __GNUC__
static inline void check_msg(struct check *c, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
#endif
static inline void check_msg(struct check *c, const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);

	if ((c->level < WARN) || (c->level <= quiet))
		return; /* Suppress message */

	fprintf(stderr, "%s (%s): ",
		(c->level == ERROR) ? "ERROR" : "Warning", c->name);
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, "\n");
}

#define FAIL(c, ...) \
	do { \
		TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__); \
		(c)->status = FAILED; \
		check_msg((c), __VA_ARGS__); \
	} while (0)

static void check_nodes_props(struct check *c, struct node *dt, struct node *node)
{
	struct node *child;
	struct property *prop;

	TRACE(c, "%s", node->fullpath);
	if (c->node_fn)
		c->node_fn(c, dt, node);

	if (c->prop_fn)
		for_each_property(node, prop) {
			TRACE(c, "%s\t'%s'", node->fullpath, prop->name);
			c->prop_fn(c, dt, node, prop);
		}

	for_each_child(node, child)
		check_nodes_props(c, dt, child);
}

static int run_check(struct check *c, struct node *dt)
{
	int error = 0;
	int i;

	assert(!c->inprogress);

	if (c->status != UNCHECKED)
		goto out;

	c->inprogress = 1;

	for (i = 0; i < c->num_prereqs; i++) {
		struct check *prq = c->prereq[i];
		error |= run_check(prq, dt);
		if (prq->status != PASSED) {
			c->status = PREREQ;
			check_msg(c, "Failed prerequisite '%s'",
				  c->prereq[i]->name);
		}
	}

	if (c->status != UNCHECKED)
		goto out;

	if (c->node_fn || c->prop_fn)
		check_nodes_props(c, dt, dt);

	if (c->tree_fn)
		c->tree_fn(c, dt);
	if (c->status == UNCHECKED)
		c->status = PASSED;

	TRACE(c, "\tCompleted, status %d", c->status);

out:
	c->inprogress = 0;
	if ((c->status != PASSED) && (c->level == ERROR))
		error = 1;
	return error;
}

/*
 * Utility check functions
 */

static void check_is_string(struct check *c, struct node *root,
			    struct node *node)
{
	struct property *prop;
	char *propname = c->data;

	prop = get_property(node, propname);
	if (!prop)
		return; /* Not present, assumed ok */

	if (!data_is_one_string(prop->val))
		FAIL(c, "\"%s\" property in %s is not a string",
		     propname, node->fullpath);
}
#define CHECK_IS_STRING(nm, propname, lvl) \
	CHECK(nm, NULL, check_is_string, NULL, (propname), (lvl))

static void check_is_cell(struct check *c, struct node *root,
			  struct node *node)
{
	struct property *prop;
	char *propname = c->data;

	prop = get_property(node, propname);
	if (!prop)
		return; /* Not present, assumed ok */

	if (prop->val.len != sizeof(cell_t))
		FAIL(c, "\"%s\" property in %s is not a single cell",
		     propname, node->fullpath);
}
#define CHECK_IS_CELL(nm, propname, lvl) \
	CHECK(nm, NULL, check_is_cell, NULL, (propname), (lvl))

/*
 * Structural check functions
 */

static void check_duplicate_node_names(struct check *c, struct node *dt,
				       struct node *node)
{
	struct node *child, *child2;

	for_each_child(node, child)
		for (child2 = child->next_sibling;
		     child2;
		     child2 = child2->next_sibling)
			if (streq(child->name, child2->name))
				FAIL(c, "Duplicate node name %s",
				     child->fullpath);
}
NODE_CHECK(duplicate_node_names, NULL, ERROR);

static void check_duplicate_property_names(struct check *c, struct node *dt,
					   struct node *node)
{
	struct property *prop, *prop2;

	for_each_property(node, prop)
		for (prop2 = prop->next; prop2; prop2 = prop2->next)
			if (streq(prop->name, prop2->name))
				FAIL(c, "Duplicate property name %s in %s",
				     prop->name, node->fullpath);
}
NODE_CHECK(duplicate_property_names, NULL, ERROR);

#define LOWERCASE	"abcdefghijklmnopqrstuvwxyz"
#define UPPERCASE	"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define DIGITS		"0123456789"
#define PROPNODECHARS	LOWERCASE UPPERCASE DIGITS ",._+*#?-"

static void check_node_name_chars(struct check *c, struct node *dt,
				  struct node *node)
{
	int n = strspn(node->name, c->data);

	if (n < strlen(node->name))
		FAIL(c, "Bad character '%c' in node %s",
		     node->name[n], node->fullpath);
}
NODE_CHECK(node_name_chars, PROPNODECHARS "@", ERROR);

static void check_node_name_format(struct check *c, struct node *dt,
				   struct node *node)
{
	if (strchr(get_unitname(node), '@'))
		FAIL(c, "Node %s has multiple '@' characters in name",
		     node->fullpath);
}
NODE_CHECK(node_name_format, NULL, ERROR, &node_name_chars);

static void check_property_name_chars(struct check *c, struct node *dt,
				      struct node *node, struct property *prop)
{
	int n = strspn(prop->name, c->data);

	if (n < strlen(prop->name))
		FAIL(c, "Bad character '%c' in property name \"%s\", node %s",
		     prop->name[n], prop->name, node->fullpath);
}
PROP_CHECK(property_name_chars, PROPNODECHARS, ERROR);

static void check_explicit_phandles(struct check *c, struct node *root,
					  struct node *node)
{
	struct property *prop;
	struct node *other;
	cell_t phandle;

	prop = get_property(node, "linux,phandle");
	if (! prop)
		return; /* No phandle, that's fine */

	if (prop->val.len != sizeof(cell_t)) {
		FAIL(c, "%s has bad length (%d) linux,phandle property",
		     node->fullpath, prop->val.len);
		return;
	}

	phandle = propval_cell(prop);
	if ((phandle == 0) || (phandle == -1)) {
		FAIL(c, "%s has invalid linux,phandle value 0x%x",
		     node->fullpath, phandle);
		return;
	}

	other = get_node_by_phandle(root, phandle);
	if (other) {
		FAIL(c, "%s has duplicated phandle 0x%x (seen before at %s)",
		     node->fullpath, phandle, other->fullpath);
		return;
	}

	node->phandle = phandle;
}
NODE_CHECK(explicit_phandles, NULL, ERROR);

static void check_name_properties(struct check *c, struct node *root,
				  struct node *node)
{
	struct property **pp, *prop = NULL;

	for (pp = &node->proplist; *pp; pp = &((*pp)->next))
		if (streq((*pp)->name, "name")) {
			prop = *pp;
			break;
		}

	if (!prop)
		return; /* No name property, that's fine */

	if ((prop->val.len != node->basenamelen+1)
	    || (memcmp(prop->val.val, node->name, node->basenamelen) != 0)) {
		FAIL(c, "\"name\" property in %s is incorrect (\"%s\" instead"
		     " of base node name)", node->fullpath, prop->val.val);
	} else {
		/* The name property is correct, and therefore redundant.
		 * Delete it */
		*pp = prop->next;
		free(prop->name);
		data_free(prop->val);
		free(prop);
	}
}
CHECK_IS_STRING(name_is_string, "name", ERROR);
NODE_CHECK(name_properties, NULL, ERROR, &name_is_string);

/*
 * Reference fixup functions
 */

static void fixup_phandle_references(struct check *c, struct node *dt,
				     struct node *node, struct property *prop)
{
	struct marker *m = prop->val.markers;
	struct node *refnode;
	cell_t phandle;

	for_each_marker_of_type(m, REF_PHANDLE) {
		assert(m->offset + sizeof(cell_t) <= prop->val.len);

		refnode = get_node_by_ref(dt, m->ref);
		if (! refnode) {
			FAIL(c, "Reference to non-existent node or label \"%s\"\n",
			     m->ref);
			continue;
		}

		phandle = get_node_phandle(dt, refnode);
		*((cell_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);
	}
}
CHECK(phandle_references, NULL, NULL, fixup_phandle_references, NULL, ERROR,
      &duplicate_node_names, &explicit_phandles);

static void fixup_path_references(struct check *c, struct node *dt,
				  struct node *node, struct property *prop)
{
	struct marker *m = prop->val.markers;
	struct node *refnode;
	char *path;

	for_each_marker_of_type(m, REF_PATH) {
		assert(m->offset <= prop->val.len);

		refnode = get_node_by_ref(dt, m->ref);
		if (!refnode) {
			FAIL(c, "Reference to non-existent node or label \"%s\"\n",
			     m->ref);
			continue;
		}

		path = refnode->fullpath;
		prop->val = data_insert_at_marker(prop->val, m, path,
						  strlen(path) + 1);
	}
}
CHECK(path_references, NULL, NULL, fixup_path_references, NULL, ERROR,
      &duplicate_node_names);

/*
 * Semantic checks
 */
CHECK_IS_CELL(address_cells_is_cell, "#address-cells", WARN);
CHECK_IS_CELL(size_cells_is_cell, "#size-cells", WARN);
CHECK_IS_CELL(interrupt_cells_is_cell, "#interrupt-cells", WARN);

CHECK_IS_STRING(device_type_is_string, "device_type", WARN);
CHECK_IS_STRING(model_is_string, "model", WARN);
CHECK_IS_STRING(status_is_string, "status", WARN);

static void fixup_addr_size_cells(struct check *c, struct node *dt,
				  struct node *node)
{
	struct property *prop;

	node->addr_cells = -1;
	node->size_cells = -1;

	prop = get_property(node, "#address-cells");
	if (prop)
		node->addr_cells = propval_cell(prop);

	prop = get_property(node, "#size-cells");
	if (prop)
		node->size_cells = propval_cell(prop);
}
CHECK(addr_size_cells, NULL, fixup_addr_size_cells, NULL, NULL, WARN,
      &address_cells_is_cell, &size_cells_is_cell);

#define node_addr_cells(n) \
	(((n)->addr_cells == -1) ? 2 : (n)->addr_cells)
#define node_size_cells(n) \
	(((n)->size_cells == -1) ? 1 : (n)->size_cells)

static void check_reg_format(struct check *c, struct node *dt,
			     struct node *node)
{
	struct property *prop;
	int addr_cells, size_cells, entrylen;

	prop = get_property(node, "reg");
	if (!prop)
		return; /* No "reg", that's fine */

	if (!node->parent) {
		FAIL(c, "Root node has a \"reg\" property");
		return;
	}

	if (prop->val.len == 0)
		FAIL(c, "\"reg\" property in %s is empty", node->fullpath);

	addr_cells = node_addr_cells(node->parent);
	size_cells = node_size_cells(node->parent);
	entrylen = (addr_cells + size_cells) * sizeof(cell_t);

	if ((prop->val.len % entrylen) != 0)
		FAIL(c, "\"reg\" property in %s has invalid length (%d bytes) "
		     "(#address-cells == %d, #size-cells == %d)",
		     node->fullpath, prop->val.len, addr_cells, size_cells);
}
NODE_CHECK(reg_format, NULL, WARN, &addr_size_cells);

static void check_ranges_format(struct check *c, struct node *dt,
				struct node *node)
{
	struct property *prop;
	int c_addr_cells, p_addr_cells, c_size_cells, p_size_cells, entrylen;

	prop = get_property(node, "ranges");
	if (!prop)
		return;

	if (!node->parent) {
		FAIL(c, "Root node has a \"ranges\" property");
		return;
	}

	p_addr_cells = node_addr_cells(node->parent);
	p_size_cells = node_size_cells(node->parent);
	c_addr_cells = node_addr_cells(node);
	c_size_cells = node_size_cells(node);
	entrylen = (p_addr_cells + c_addr_cells + c_size_cells) * sizeof(cell_t);

	if (prop->val.len == 0) {
		if (p_addr_cells != c_addr_cells)
			FAIL(c, "%s has empty \"ranges\" property but its "
			     "#address-cells (%d) differs from %s (%d)",
			     node->fullpath, c_addr_cells, node->parent->fullpath,
			     p_addr_cells);
		if (p_size_cells != c_size_cells)
			FAIL(c, "%s has empty \"ranges\" property but its "
			     "#size-cells (%d) differs from %s (%d)",
			     node->fullpath, c_size_cells, node->parent->fullpath,
			     p_size_cells);
	} else if ((prop->val.len % entrylen) != 0) {
		FAIL(c, "\"ranges\" property in %s has invalid length (%d bytes) "
		     "(parent #address-cells == %d, child #address-cells == %d, "
		     "#size-cells == %d)", node->fullpath, prop->val.len,
		     p_addr_cells, c_addr_cells, c_size_cells);
	}
}
NODE_CHECK(ranges_format, NULL, WARN, &addr_size_cells);

/*
 * Style checks
 */
static void check_avoid_default_addr_size(struct check *c, struct node *dt,
					  struct node *node)
{
	struct property *reg, *ranges;

	if (!node->parent)
		return; /* Ignore root node */

	reg = get_property(node, "reg");
	ranges = get_property(node, "ranges");

	if (!reg && !ranges)
		return;

	if ((node->parent->addr_cells == -1))
		FAIL(c, "Relying on default #address-cells value for %s",
		     node->fullpath);

	if ((node->parent->size_cells == -1))
		FAIL(c, "Relying on default #size-cells value for %s",
		     node->fullpath);
}
NODE_CHECK(avoid_default_addr_size, NULL, WARN, &addr_size_cells);

static void check_obsolete_chosen_interrupt_controller(struct check *c,
						       struct node *dt)
{
	struct node *chosen;
	struct property *prop;

	chosen = get_node_by_path(dt, "/chosen");
	if (!chosen)
		return;

	prop = get_property(chosen, "interrupt-controller");
	if (prop)
		FAIL(c, "/chosen has obsolete \"interrupt-controller\" "
		     "property");
}
TREE_CHECK(obsolete_chosen_interrupt_controller, NULL, WARN);

static struct check *check_table[] = {
	&duplicate_node_names, &duplicate_property_names,
	&node_name_chars, &node_name_format, &property_name_chars,
	&name_is_string, &name_properties,
	&explicit_phandles,
	&phandle_references, &path_references,

	&address_cells_is_cell, &size_cells_is_cell, &interrupt_cells_is_cell,
	&device_type_is_string, &model_is_string, &status_is_string,

	&addr_size_cells, &reg_format, &ranges_format,

	&avoid_default_addr_size,
	&obsolete_chosen_interrupt_controller,
};

void process_checks(int force, struct boot_info *bi)
{
	struct node *dt = bi->dt;
	int i;
	int error = 0;

	for (i = 0; i < ARRAY_SIZE(check_table); i++) {
		struct check *c = check_table[i];

		if (c->level != IGNORE)
			error = error || run_check(c, dt);
	}

	if (error) {
		if (!force) {
			fprintf(stderr, "ERROR: Input tree has errors, aborting "
				"(use -f to force output)\n");
			exit(2);
		} else if (quiet < 3) {
			fprintf(stderr, "Warning: Input tree has errors, "
				"output forced\n");
		}
	}
}