Merge branch 'acpi-properties'

Merge changes adding support for device properties with buffer values
to the ACPI device properties handling code.

* acpi-properties:
  ACPI: property: Fix error handling in acpi_init_properties()
  ACPI: property: Read buffer properties as integers
  ACPI: property: Add support for parsing buffer property UUID
  ACPI: property: Unify integer value reading functions
  ACPI: property: Switch node property referencing from ifs to a switch
  ACPI: property: Move property ref argument parsing into a new function
  ACPI: property: Use acpi_object_type consistently in property ref parsing
  ACPI: property: Tie data nodes to acpi handles
  ACPI: property: Return type of acpi_add_nondev_subnodes() should be bool

3 files changed, 318 insertions, 151 deletions

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e764f9ac9cf8..7b3ad8ed2f4e 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -55,14 +55,19 @@ static const guid_t ads_guid =
 	GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
 		  0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
 
+static const guid_t buffer_prop_guid =
+	GUID_INIT(0xedb12dd0, 0x363d, 0x4085,
+		  0xa3, 0xd2, 0x49, 0x52, 0x2c, 0xa1, 0x60, 0xc4);
+
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
-					   const union acpi_object *desc,
+					   union acpi_object *desc,
 					   struct acpi_device_data *data,
 					   struct fwnode_handle *parent);
-static bool acpi_extract_properties(const union acpi_object *desc,
+static bool acpi_extract_properties(acpi_handle handle,
+				    union acpi_object *desc,
 				    struct acpi_device_data *data);
 
-static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
+static bool acpi_nondev_subnode_extract(union acpi_object *desc,
 					acpi_handle handle,
 					const union acpi_object *link,
 					struct list_head *list,
@@ -81,7 +86,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
 	INIT_LIST_HEAD(&dn->data.properties);
 	INIT_LIST_HEAD(&dn->data.subnodes);
 
-	result = acpi_extract_properties(desc, &dn->data);
+	result = acpi_extract_properties(handle, desc, &dn->data);
 
 	if (handle) {
 		acpi_handle scope;
@@ -155,16 +160,16 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope,
 	return acpi_nondev_subnode_data_ok(handle, link, list, parent);
 }
 
-static int acpi_add_nondev_subnodes(acpi_handle scope,
-				    const union acpi_object *links,
-				    struct list_head *list,
-				    struct fwnode_handle *parent)
+static bool acpi_add_nondev_subnodes(acpi_handle scope,
+				     union acpi_object *links,
+				     struct list_head *list,
+				     struct fwnode_handle *parent)
 {
 	bool ret = false;
 	int i;
 
 	for (i = 0; i < links->package.count; i++) {
-		const union acpi_object *link, *desc;
+		union acpi_object *link, *desc;
 		acpi_handle handle;
 		bool result;
 
@@ -204,7 +209,7 @@ static int acpi_add_nondev_subnodes(acpi_handle scope,
 }
 
 static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
-					   const union acpi_object *desc,
+					   union acpi_object *desc,
 					   struct acpi_device_data *data,
 					   struct fwnode_handle *parent)
 {
@@ -212,7 +217,8 @@ static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
 
 	/* Look for the ACPI data subnodes GUID. */
 	for (i = 0; i < desc->package.count; i += 2) {
-		const union acpi_object *guid, *links;
+		const union acpi_object *guid;
+		union acpi_object *links;
 
 		guid = &desc->package.elements[i];
 		links = &desc->package.elements[i + 1];
@@ -325,7 +331,7 @@ static bool acpi_is_property_guid(const guid_t *guid)
 
 struct acpi_device_properties *
 acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
-		    const union acpi_object *properties)
+		    union acpi_object *properties)
 {
 	struct acpi_device_properties *props;
 
@@ -340,7 +346,141 @@ acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
 	return props;
 }
 
-static bool acpi_extract_properties(const union acpi_object *desc,
+static void acpi_nondev_subnode_tag(acpi_handle handle, void *context)
+{
+}
+
+static void acpi_untie_nondev_subnodes(struct acpi_device_data *data)
+{
+	struct acpi_data_node *dn;
+
+	list_for_each_entry(dn, &data->subnodes, sibling) {
+		acpi_detach_data(dn->handle, acpi_nondev_subnode_tag);
+
+		acpi_untie_nondev_subnodes(&dn->data);
+	}
+}
+
+static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
+{
+	struct acpi_data_node *dn;
+
+	list_for_each_entry(dn, &data->subnodes, sibling) {
+		acpi_status status;
+		bool ret;
+
+		status = acpi_attach_data(dn->handle, acpi_nondev_subnode_tag, dn);
+		if (ACPI_FAILURE(status)) {
+			acpi_handle_err(dn->handle, "Can't tag data node\n");
+			return false;
+		}
+
+		ret = acpi_tie_nondev_subnodes(&dn->data);
+		if (!ret)
+			return ret;
+	}
+
+	return true;
+}
+
+static void acpi_data_add_buffer_props(acpi_handle handle,
+				       struct acpi_device_data *data,
+				       union acpi_object *properties)
+{
+	struct acpi_device_properties *props;
+	union acpi_object *package;
+	size_t alloc_size;
+	unsigned int i;
+	u32 *count;
+
+	if (check_mul_overflow((size_t)properties->package.count,
+			       sizeof(*package) + sizeof(void *),
+			       &alloc_size) ||
+	    check_add_overflow(sizeof(*props) + sizeof(*package), alloc_size,
+			       &alloc_size)) {
+		acpi_handle_warn(handle,
+				 "can't allocate memory for %u buffer props",
+				 properties->package.count);
+		return;
+	}
+
+	props = kvzalloc(alloc_size, GFP_KERNEL);
+	if (!props)
+		return;
+
+	props->guid = &buffer_prop_guid;
+	props->bufs = (void *)(props + 1);
+	props->properties = (void *)(props->bufs + properties->package.count);
+
+	/* Outer package */
+	package = props->properties;
+	package->type = ACPI_TYPE_PACKAGE;
+	package->package.elements = package + 1;
+	count = &package->package.count;
+	*count = 0;
+
+	/* Inner packages */
+	package++;
+
+	for (i = 0; i < properties->package.count; i++) {
+		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
+		union acpi_object *property = &properties->package.elements[i];
+		union acpi_object *prop, *obj, *buf_obj;
+		acpi_status status;
+
+		if (property->type != ACPI_TYPE_PACKAGE ||
+		    property->package.count != 2) {
+			acpi_handle_warn(handle,
+					 "buffer property %u has %u entries\n",
+					 i, property->package.count);
+			continue;
+		}
+
+		prop = &property->package.elements[0];
+		obj = &property->package.elements[1];
+
+		if (prop->type != ACPI_TYPE_STRING ||
+		    obj->type != ACPI_TYPE_STRING) {
+			acpi_handle_warn(handle,
+					 "wrong object types %u and %u\n",
+					 prop->type, obj->type);
+			continue;
+		}
+
+		status = acpi_evaluate_object_typed(handle, obj->string.pointer,
+						    NULL, &buf,
+						    ACPI_TYPE_BUFFER);
+		if (ACPI_FAILURE(status)) {
+			acpi_handle_warn(handle,
+					 "can't evaluate \"%*pE\" as buffer\n",
+					 obj->string.length,
+					 obj->string.pointer);
+			continue;
+		}
+
+		package->type = ACPI_TYPE_PACKAGE;
+		package->package.elements = prop;
+		package->package.count = 2;
+
+		buf_obj = buf.pointer;
+
+		/* Replace the string object with a buffer object */
+		obj->type = ACPI_TYPE_BUFFER;
+		obj->buffer.length = buf_obj->buffer.length;
+		obj->buffer.pointer = buf_obj->buffer.pointer;
+
+		props->bufs[i] = buf.pointer;
+		package++;
+		(*count)++;
+	}
+
+	if (*count)
+		list_add(&props->list, &data->properties);
+	else
+		kvfree(props);
+}
+
+static bool acpi_extract_properties(acpi_handle scope, union acpi_object *desc,
 				    struct acpi_device_data *data)
 {
 	int i;
@@ -350,7 +490,8 @@ static bool acpi_extract_properties(const union acpi_object *desc,
 
 	/* Look for the device properties GUID. */
 	for (i = 0; i < desc->package.count; i += 2) {
-		const union acpi_object *guid, *properties;
+		const union acpi_object *guid;
+		union acpi_object *properties;
 
 		guid = &desc->package.elements[i];
 		properties = &desc->package.elements[i + 1];
@@ -364,6 +505,12 @@ static bool acpi_extract_properties(const union acpi_object *desc,
 		    properties->type != ACPI_TYPE_PACKAGE)
 			break;
 
+		if (guid_equal((guid_t *)guid->buffer.pointer,
+			       &buffer_prop_guid)) {
+			acpi_data_add_buffer_props(scope, data, properties);
+			continue;
+		}
+
 		if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
 			continue;
 
@@ -410,7 +557,7 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (ACPI_FAILURE(status))
 		goto out;
 
-	if (acpi_extract_properties(buf.pointer, &adev->data)) {
+	if (acpi_extract_properties(adev->handle, buf.pointer, &adev->data)) {
 		adev->data.pointer = buf.pointer;
 		if (acpi_of)
 			acpi_init_of_compatible(adev);
@@ -422,6 +569,9 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (!adev->data.pointer) {
 		acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n");
 		ACPI_FREE(buf.pointer);
+	} else {
+		if (!acpi_tie_nondev_subnodes(&adev->data))
+			acpi_untie_nondev_subnodes(&adev->data);
 	}
 
  out:
@@ -438,8 +588,14 @@ static void acpi_free_device_properties(struct list_head *list)
 	struct acpi_device_properties *props, *tmp;
 
 	list_for_each_entry_safe(props, tmp, list, list) {
+		u32 i;
+
 		list_del(&props->list);
-		kfree(props);
+		/* Buffer data properties were separately allocated */
+		if (props->bufs)
+			for (i = 0; i < props->properties->package.count; i++)
+				ACPI_FREE(props->bufs[i]);
+		kvfree(props);
 	}
 }
 
@@ -462,6 +618,7 @@ static void acpi_destroy_nondev_subnodes(struct list_head *list)
 
 void acpi_free_properties(struct acpi_device *adev)
 {
+	acpi_untie_nondev_subnodes(&adev->data);
 	acpi_destroy_nondev_subnodes(&adev->data.subnodes);
 	ACPI_FREE((void *)adev->data.pointer);
 	adev->data.of_compatible = NULL;
@@ -633,6 +790,58 @@ acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
 	return NULL;
 }
 
+static int acpi_get_ref_args(struct fwnode_reference_args *args,
+			     struct fwnode_handle *ref_fwnode,
+			     const union acpi_object **element,
+			     const union acpi_object *end, size_t num_args)
+{
+	u32 nargs = 0, i;
+
+	/*
+	 * Find the referred data extension node under the
+	 * referred device node.
+	 */
+	for (; *element < end && (*element)->type == ACPI_TYPE_STRING;
+	     (*element)++) {
+		const char *child_name = (*element)->string.pointer;
+
+		ref_fwnode = acpi_fwnode_get_named_child_node(ref_fwnode, child_name);
+		if (!ref_fwnode)
+			return -EINVAL;
+	}
+
+	/*
+	 * Assume the following integer elements are all args. Stop counting on
+	 * the first reference or end of the package arguments. In case of
+	 * neither reference, nor integer, return an error, we can't parse it.
+	 */
+	for (i = 0; (*element) + i < end && i < num_args; i++) {
+		acpi_object_type type = (*element)[i].type;
+
+		if (type == ACPI_TYPE_LOCAL_REFERENCE)
+			break;
+
+		if (type == ACPI_TYPE_INTEGER)
+			nargs++;
+		else
+			return -EINVAL;
+	}
+
+	if (nargs > NR_FWNODE_REFERENCE_ARGS)
+		return -EINVAL;
+
+	if (args) {
+		args->fwnode = ref_fwnode;
+		args->nargs = nargs;
+		for (i = 0; i < nargs; i++)
+			args->args[i] = (*element)[i].integer.value;
+	}
+
+	(*element) += nargs;
+
+	return 0;
+}
+
 /**
  * __acpi_node_get_property_reference - returns handle to the referenced object
  * @fwnode: Firmware node to get the property from
@@ -686,11 +895,9 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 	if (ret)
 		return ret == -EINVAL ? -ENOENT : -EINVAL;
 
-	/*
-	 * The simplest case is when the value is a single reference.  Just
-	 * return that reference then.
-	 */
-	if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) {
+	switch (obj->type) {
+	case ACPI_TYPE_LOCAL_REFERENCE:
+		/* Plain single reference without arguments. */
 		if (index)
 			return -ENOENT;
 
@@ -701,19 +908,21 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 		args->fwnode = acpi_fwnode_handle(device);
 		args->nargs = 0;
 		return 0;
+	case ACPI_TYPE_PACKAGE:
+		/*
+		 * If it is not a single reference, then it is a package of
+		 * references followed by number of ints as follows:
+		 *
+		 *  Package () { REF, INT, REF, INT, INT }
+		 *
+		 * The index argument is then used to determine which reference
+		 * the caller wants (along with the arguments).
+		 */
+		break;
+	default:
+		return -EINVAL;
 	}
 
-	/*
-	 * If it is not a single reference, then it is a package of
-	 * references followed by number of ints as follows:
-	 *
-	 *  Package () { REF, INT, REF, INT, INT }
-	 *
-	 * The index argument is then used to determine which reference
-	 * the caller wants (along with the arguments).
-	 */
-	if (obj->type != ACPI_TYPE_PACKAGE)
-		return -EINVAL;
 	if (index >= obj->package.count)
 		return -ENOENT;
 
@@ -721,66 +930,30 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 	end = element + obj->package.count;
 
 	while (element < end) {
-		u32 nargs, i;
-
-		if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
-			struct fwnode_handle *ref_fwnode;
-
+		switch (element->type) {
+		case ACPI_TYPE_LOCAL_REFERENCE:
 			device = acpi_fetch_acpi_dev(element->reference.handle);
 			if (!device)
 				return -EINVAL;
 
-			nargs = 0;
 			element++;
 
-			/*
-			 * Find the referred data extension node under the
-			 * referred device node.
-			 */
-			for (ref_fwnode = acpi_fwnode_handle(device);
-			     element < end && element->type == ACPI_TYPE_STRING;
-			     element++) {
-				ref_fwnode = acpi_fwnode_get_named_child_node(
-					ref_fwnode, element->string.pointer);
-				if (!ref_fwnode)
-					return -EINVAL;
-			}
-
-			/*
-			 * Assume the following integer elements are all args.
-			 * Stop counting on the first reference or end of the
-			 * package arguments. In case of neither reference,
-			 * nor integer, return an error, we can't parse it.
-			 */
-			for (i = 0; element + i < end && i < num_args; i++) {
-				int type = element[i].type;
-
-				if (type == ACPI_TYPE_LOCAL_REFERENCE)
-					break;
-				if (type == ACPI_TYPE_INTEGER)
-					nargs++;
-				else
-					return -EINVAL;
-			}
-
-			if (nargs > NR_FWNODE_REFERENCE_ARGS)
-				return -EINVAL;
-
-			if (idx == index) {
-				args->fwnode = ref_fwnode;
-				args->nargs = nargs;
-				for (i = 0; i < nargs; i++)
-					args->args[i] = element[i].integer.value;
+			ret = acpi_get_ref_args(idx == index ? args : NULL,
+						acpi_fwnode_handle(device),
+						&element, end, num_args);
+			if (ret < 0)
+				return ret;
 
+			if (idx == index)
 				return 0;
-			}
 
-			element += nargs;
-		} else if (element->type == ACPI_TYPE_INTEGER) {
+			break;
+		case ACPI_TYPE_INTEGER:
 			if (idx == index)
 				return -ENOENT;
 			element++;
-		} else {
+			break;
+		default:
 			return -EINVAL;
 		}
 
@@ -852,67 +1025,37 @@ static int acpi_data_prop_read_single(const struct acpi_device_data *data,
 	return ret;
 }
 
-static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
-				       size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U8_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u16(const union acpi_object *items,
-					u16 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U16_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u32(const union acpi_object *items,
-					u32 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-		if (items[i].integer.value > U32_MAX)
-			return -EOVERFLOW;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
-
-static int acpi_copy_property_array_u64(const union acpi_object *items,
-					u64 *val, size_t nval)
-{
-	int i;
-
-	for (i = 0; i < nval; i++) {
-		if (items[i].type != ACPI_TYPE_INTEGER)
-			return -EPROTO;
-
-		val[i] = items[i].integer.value;
-	}
-	return 0;
-}
+#define acpi_copy_property_array_uint(items, val, nval)			\
+	({								\
+		typeof(items) __items = items;				\
+		typeof(val) __val = val;				\
+		typeof(nval) __nval = nval;				\
+		size_t i;						\
+		int ret = 0;						\
+									\
+		for (i = 0; i < __nval; i++) {				\
+			if (__items->type == ACPI_TYPE_BUFFER) {	\
+				__val[i] = __items->buffer.pointer[i];	\
+				continue;				\
+			}						\
+			if (__items[i].type != ACPI_TYPE_INTEGER) {	\
+				ret = -EPROTO;				\
+				break;					\
+			}						\
+			if (__items[i].integer.value > _Generic(__val,	\
+								u8: U8_MAX, \
+								u16: U16_MAX, \
+								u32: U32_MAX, \
+								u64: U64_MAX, \
+								default: 0U)) { \
+				ret = -EOVERFLOW;			\
+				break;					\
+			}						\
+									\
+			__val[i] = __items[i].integer.value;		\
+		}							\
+		ret;							\
+	})
 
 static int acpi_copy_property_array_string(const union acpi_object *items,
 					   char **val, size_t nval)
@@ -954,31 +1097,54 @@ static int acpi_data_prop_read(const struct acpi_device_data *data,
 	}
 
 	ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
+	if (ret && proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64)
+		ret = acpi_data_get_property(data, propname, ACPI_TYPE_BUFFER,
+					     &obj);
 	if (ret)
 		return ret;
 
-	if (!val)
+	if (!val) {
+		if (obj->type == ACPI_TYPE_BUFFER)
+			return obj->buffer.length;
+
 		return obj->package.count;
+	}
 
-	if (proptype != DEV_PROP_STRING && nval > obj->package.count)
-		return -EOVERFLOW;
+	switch (proptype) {
+	case DEV_PROP_STRING:
+		break;
+	case DEV_PROP_U8 ... DEV_PROP_U64:
+		if (obj->type == ACPI_TYPE_BUFFER) {
+			if (nval > obj->buffer.length)
+				return -EOVERFLOW;
+			break;
+		}
+		fallthrough;
+	default:
+		if (nval > obj->package.count)
+			return -EOVERFLOW;
+		break;
+	}
 	if (nval == 0)
 		return -EINVAL;
 
-	items = obj->package.elements;
+	if (obj->type != ACPI_TYPE_BUFFER)
+		items = obj->package.elements;
+	else
+		items = obj;
 
 	switch (proptype) {
 	case DEV_PROP_U8:
-		ret = acpi_copy_property_array_u8(items, (u8 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u8 *)val, nval);
 		break;
 	case DEV_PROP_U16:
-		ret = acpi_copy_property_array_u16(items, (u16 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u16 *)val, nval);
 		break;
 	case DEV_PROP_U32:
-		ret = acpi_copy_property_array_u32(items, (u32 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u32 *)val, nval);
 		break;
 	case DEV_PROP_U64:
-		ret = acpi_copy_property_array_u64(items, (u64 *)val, nval);
+		ret = acpi_copy_property_array_uint(items, (u64 *)val, nval);
 		break;
 	case DEV_PROP_STRING:
 		ret = acpi_copy_property_array_string(
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 48f0fd499274..e7d27373ff71 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -344,8 +344,9 @@ struct acpi_device_physical_node {
 
 struct acpi_device_properties {
 	const guid_t *guid;
-	const union acpi_object *properties;
+	union acpi_object *properties;
 	struct list_head list;
+	void **bufs;
 };
 
 /* ACPI Device Specific Data (_DSD) */
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 7e7a33b6c8d7..ce00cca3f1bd 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1245,7 +1245,7 @@ static inline bool acpi_dev_has_props(const struct acpi_device *adev)
 
 struct acpi_device_properties *
 acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
-		    const union acpi_object *properties);
+		    union acpi_object *properties);
 
 int acpi_node_prop_get(const struct fwnode_handle *fwnode, const char *propname,
 		       void **valptr);