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2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29 
 kernel/drivers/acpi/property.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * ACPI device specific properties support.
34  *
....@@ -7,10 +8,6 @@
78  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
89  *          Darren Hart <dvhart@linux.intel.com>
910  *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
10
- *
11
- * This program is free software; you can redistribute it and/or modify
12
- * it under the terms of the GNU General Public License version 2 as
13
- * published by the Free Software Foundation.
1411  */
1512 
1613 #include <linux/acpi.h>
....@@ -24,10 +21,35 @@
2421 					acpi_object_type type,
2522 					const union acpi_object **obj);
2623 
27
-/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
28
-static const guid_t prp_guid =
24
+/*
25
+ * The GUIDs here are made equivalent to each other in order to avoid extra
26
+ * complexity in the properties handling code, with the caveat that the
27
+ * kernel will accept certain combinations of GUID and properties that are
28
+ * not defined without a warning. For instance if any of the properties
29
+ * from different GUID appear in a property list of another, it will be
30
+ * accepted by the kernel. Firmware validation tools should catch these.
31
+ */
32
+static const guid_t prp_guids[] = {
33
+	/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
2934 	GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
30
-		  0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01);
35
+		  0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
36
+	/* Hotplug in D3 GUID: 6211e2c0-58a3-4af3-90e1-927a4e0c55a4 */
37
+	GUID_INIT(0x6211e2c0, 0x58a3, 0x4af3,
38
+		  0x90, 0xe1, 0x92, 0x7a, 0x4e, 0x0c, 0x55, 0xa4),
39
+	/* External facing port GUID: efcc06cc-73ac-4bc3-bff0-76143807c389 */
40
+	GUID_INIT(0xefcc06cc, 0x73ac, 0x4bc3,
41
+		  0xbf, 0xf0, 0x76, 0x14, 0x38, 0x07, 0xc3, 0x89),
42
+	/* Thunderbolt GUID for IMR_VALID: c44d002f-69f9-4e7d-a904-a7baabdf43f7 */
43
+	GUID_INIT(0xc44d002f, 0x69f9, 0x4e7d,
44
+		  0xa9, 0x04, 0xa7, 0xba, 0xab, 0xdf, 0x43, 0xf7),
45
+	/* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296-ba72-9bf5a26ebe5d */
46
+	GUID_INIT(0x6c501103, 0xc189, 0x4296,
47
+		  0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d),
48
+	/* Storage device needs D3 GUID: 5025030f-842f-4ab4-a561-99a5189762d0 */
49
+	GUID_INIT(0x5025030f, 0x842f, 0x4ab4,
50
+		  0xa5, 0x61, 0x99, 0xa5, 0x18, 0x97, 0x62, 0xd0),
51
+};
52
+
3153 /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
3254 static const guid_t ads_guid =
3355 	GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
....@@ -54,8 +76,9 @@
5476 		return false;
5577 
5678 	dn->name = link->package.elements[0].string.pointer;
57
-	dn->fwnode.ops = &acpi_data_fwnode_ops;
79
+	fwnode_init(&dn->fwnode, &acpi_data_fwnode_ops);
5880 	dn->parent = parent;
81
+	INIT_LIST_HEAD(&dn->data.properties);
5982 	INIT_LIST_HEAD(&dn->data.subnodes);
6083 
6184 	result = acpi_extract_properties(desc, &dn->data);
....@@ -132,10 +155,10 @@
132155 	return acpi_nondev_subnode_data_ok(handle, link, list, parent);
133156 }
134157 
135
-static int acpi_add_nondev_subnodes(acpi_handle scope,
136
-				    const union acpi_object *links,
137
-				    struct list_head *list,
138
-				    struct fwnode_handle *parent)
158
+static bool acpi_add_nondev_subnodes(acpi_handle scope,
159
+				     const union acpi_object *links,
160
+				     struct list_head *list,
161
+				     struct fwnode_handle *parent)
139162 {
140163 	bool ret = false;
141164 	int i;
....@@ -288,6 +311,35 @@
288311 	adev->flags.of_compatible_ok = 1;
289312 }
290313 
314
+static bool acpi_is_property_guid(const guid_t *guid)
315
+{
316
+	int i;
317
+
318
+	for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
319
+		if (guid_equal(guid, &prp_guids[i]))
320
+			return true;
321
+	}
322
+
323
+	return false;
324
+}
325
+
326
+struct acpi_device_properties *
327
+acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
328
+		    const union acpi_object *properties)
329
+{
330
+	struct acpi_device_properties *props;
331
+
332
+	props = kzalloc(sizeof(*props), GFP_KERNEL);
333
+	if (props) {
334
+		INIT_LIST_HEAD(&props->list);
335
+		props->guid = guid;
336
+		props->properties = properties;
337
+		list_add_tail(&props->list, &data->properties);
338
+	}
339
+
340
+	return props;
341
+}
342
+
291343 static bool acpi_extract_properties(const union acpi_object *desc,
292344 				    struct acpi_device_data *data)
293345 {
....@@ -312,7 +364,7 @@
312364 		    properties->type != ACPI_TYPE_PACKAGE)
313365 			break;
314366 
315
-		if (!guid_equal((guid_t *)guid->buffer.pointer, &prp_guid))
367
+		if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
316368 			continue;
317369 
318370 		/*
....@@ -320,13 +372,13 @@
320372 		 * package immediately following it.
321373 		 */
322374 		if (!acpi_properties_format_valid(properties))
323
-			break;
375
+			continue;
324376 
325
-		data->properties = properties;
326
-		return true;
377
+		acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
378
+				    properties);
327379 	}
328380 
329
-	return false;
381
+	return !list_empty(&data->properties);
330382 }
331383 
332384 void acpi_init_properties(struct acpi_device *adev)
....@@ -336,6 +388,7 @@
336388 	acpi_status status;
337389 	bool acpi_of = false;
338390 
391
+	INIT_LIST_HEAD(&adev->data.properties);
339392 	INIT_LIST_HEAD(&adev->data.subnodes);
340393 
341394 	if (!adev->handle)
....@@ -380,6 +433,16 @@
380433 		acpi_extract_apple_properties(adev);
381434 }
382435 
436
+static void acpi_free_device_properties(struct list_head *list)
437
+{
438
+	struct acpi_device_properties *props, *tmp;
439
+
440
+	list_for_each_entry_safe(props, tmp, list, list) {
441
+		list_del(&props->list);
442
+		kfree(props);
443
+	}
444
+}
445
+
383446 static void acpi_destroy_nondev_subnodes(struct list_head *list)
384447 {
385448 	struct acpi_data_node *dn, *next;
....@@ -392,6 +455,7 @@
392455 		wait_for_completion(&dn->kobj_done);
393456 		list_del(&dn->sibling);
394457 		ACPI_FREE((void *)dn->data.pointer);
458
+		acpi_free_device_properties(&dn->data.properties);
395459 		kfree(dn);
396460 	}
397461 }
....@@ -402,7 +466,7 @@
402466 	ACPI_FREE((void *)adev->data.pointer);
403467 	adev->data.of_compatible = NULL;
404468 	adev->data.pointer = NULL;
405
-	adev->data.properties = NULL;
469
+	acpi_free_device_properties(&adev->data.properties);
406470 }
407471 
408472 /**
....@@ -427,32 +491,37 @@
427491 				  const char *name, acpi_object_type type,
428492 				  const union acpi_object **obj)
429493 {
430
-	const union acpi_object *properties;
431
-	int i;
494
+	const struct acpi_device_properties *props;
432495 
433496 	if (!data || !name)
434497 		return -EINVAL;
435498 
436
-	if (!data->pointer || !data->properties)
499
+	if (!data->pointer || list_empty(&data->properties))
437500 		return -EINVAL;
438501 
439
-	properties = data->properties;
440
-	for (i = 0; i < properties->package.count; i++) {
441
-		const union acpi_object *propname, *propvalue;
442
-		const union acpi_object *property;
502
+	list_for_each_entry(props, &data->properties, list) {
503
+		const union acpi_object *properties;
504
+		unsigned int i;
443505 
444
-		property = &properties->package.elements[i];
506
+		properties = props->properties;
507
+		for (i = 0; i < properties->package.count; i++) {
508
+			const union acpi_object *propname, *propvalue;
509
+			const union acpi_object *property;
445510 
446
-		propname = &property->package.elements[0];
447
-		propvalue = &property->package.elements[1];
511
+			property = &properties->package.elements[i];
448512 
449
-		if (!strcmp(name, propname->string.pointer)) {
450
-			if (type != ACPI_TYPE_ANY && propvalue->type != type)
451
-				return -EPROTO;
452
-			if (obj)
453
-				*obj = propvalue;
513
+			propname = &property->package.elements[0];
514
+			propvalue = &property->package.elements[1];
454515 
455
-			return 0;
516
+			if (!strcmp(name, propname->string.pointer)) {
517
+				if (type != ACPI_TYPE_ANY &&
518
+				    propvalue->type != type)
519
+					return -EPROTO;
520
+				if (obj)
521
+					*obj = propvalue;
522
+
523
+				return 0;
524
+			}
456525 		}
457526 	}
458527 	return -EINVAL;
....@@ -548,13 +617,17 @@
548617 {
549618 	struct fwnode_handle *child;
550619 
551
-	/*
552
-	 * Find first matching named child node of this fwnode.
553
-	 * For ACPI this will be a data only sub-node.
554
-	 */
555
-	fwnode_for_each_child_node(fwnode, child)
556
-		if (acpi_data_node_match(child, childname))
620
+	fwnode_for_each_child_node(fwnode, child) {
621
+		if (is_acpi_data_node(child)) {
622
+			if (acpi_data_node_match(child, childname))
623
+				return child;
624
+			continue;
625
+		}
626
+
627
+		if (!strncmp(acpi_device_bid(to_acpi_device_node(child)),
628
+			     childname, ACPI_NAMESEG_SIZE))
557629 			return child;
630
+	}
558631 
559632 	return NULL;
560633 }
....@@ -618,7 +691,7 @@
618691 	 */
619692 	if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
620693 		if (index)
621
-			return -EINVAL;
694
+			return -ENOENT;
622695 
623696 		ret = acpi_bus_get_device(obj->reference.handle, &device);
624697 		if (ret)
....@@ -1043,15 +1116,10 @@
10431116 		/* All data nodes have parent pointer so just return that */
10441117 		return to_acpi_data_node(fwnode)->parent;
10451118 	} else if (is_acpi_device_node(fwnode)) {
1046
-		acpi_handle handle, parent_handle;
1119
+		struct device *dev = to_acpi_device_node(fwnode)->dev.parent;
10471120 
1048
-		handle = to_acpi_device_node(fwnode)->handle;
1049
-		if (ACPI_SUCCESS(acpi_get_parent(handle, &parent_handle))) {
1050
-			struct acpi_device *adev;
1051
-
1052
-			if (!acpi_bus_get_device(parent_handle, &adev))
1053
-				return acpi_fwnode_handle(adev);
1054
-		}
1121
+		if (dev)
1122
+			return acpi_fwnode_handle(to_acpi_device(dev));
10551123 	}
10561124 
10571125 	return NULL;
....@@ -1164,7 +1232,7 @@
11641232 
11651233 
11661234 /**
1167
- * acpi_graph_get_remote_enpoint - Parses and returns remote end of an endpoint
1235
+ * acpi_graph_get_remote_endpoint - Parses and returns remote end of an endpoint
11681236  * @fwnode: Endpoint firmware node pointing to a remote device
11691237  * @endpoint: Firmware node of remote endpoint is filled here if not %NULL
11701238  *
....@@ -1265,6 +1333,52 @@
12651333 						  args_count, args);
12661334 }
12671335 
1336
+static const char *acpi_fwnode_get_name(const struct fwnode_handle *fwnode)
1337
+{
1338
+	const struct acpi_device *adev;
1339
+	struct fwnode_handle *parent;
1340
+
1341
+	/* Is this the root node? */
1342
+	parent = fwnode_get_parent(fwnode);
1343
+	if (!parent)
1344
+		return "\\";
1345
+
1346
+	fwnode_handle_put(parent);
1347
+
1348
+	if (is_acpi_data_node(fwnode)) {
1349
+		const struct acpi_data_node *dn = to_acpi_data_node(fwnode);
1350
+
1351
+		return dn->name;
1352
+	}
1353
+
1354
+	adev = to_acpi_device_node(fwnode);
1355
+	if (WARN_ON(!adev))
1356
+		return NULL;
1357
+
1358
+	return acpi_device_bid(adev);
1359
+}
1360
+
1361
+static const char *
1362
+acpi_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
1363
+{
1364
+	struct fwnode_handle *parent;
1365
+
1366
+	/* Is this the root node? */
1367
+	parent = fwnode_get_parent(fwnode);
1368
+	if (!parent)
1369
+		return "";
1370
+
1371
+	/* Is this 2nd node from the root? */
1372
+	parent = fwnode_get_next_parent(parent);
1373
+	if (!parent)
1374
+		return "";
1375
+
1376
+	fwnode_handle_put(parent);
1377
+
1378
+	/* ACPI device or data node. */
1379
+	return ".";
1380
+}
1381
+
12681382 static struct fwnode_handle *
12691383 acpi_fwnode_get_parent(struct fwnode_handle *fwnode)
12701384 {
....@@ -1305,6 +1419,8 @@
13051419 		.get_parent = acpi_node_get_parent,			\
13061420 		.get_next_child_node = acpi_get_next_subnode,		\
13071421 		.get_named_child_node = acpi_fwnode_get_named_child_node, \
1422
+		.get_name = acpi_fwnode_get_name,			\
1423
+		.get_name_prefix = acpi_fwnode_get_name_prefix,		\
13081424 		.get_reference_args = acpi_fwnode_get_reference_args,	\
13091425 		.graph_get_next_endpoint =				\
13101426 			acpi_graph_get_next_endpoint,			\