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Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/acpica/nsutils.c | 731 |
1 files changed, 731 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsutils.c b/drivers/acpi/acpica/nsutils.c new file mode 100644 index 000000000..e66abdab8 --- /dev/null +++ b/drivers/acpi/acpica/nsutils.c @@ -0,0 +1,731 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing + * parents and siblings and Scope manipulation + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acnamesp.h" +#include "amlcode.h" + +#define _COMPONENT ACPI_NAMESPACE +ACPI_MODULE_NAME("nsutils") + +/* Local prototypes */ +#ifdef ACPI_OBSOLETE_FUNCTIONS +acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search); +#endif + +/******************************************************************************* + * + * FUNCTION: acpi_ns_print_node_pathname + * + * PARAMETERS: node - Object + * message - Prefix message + * + * DESCRIPTION: Print an object's full namespace pathname + * Manages allocation/freeing of a pathname buffer + * + ******************************************************************************/ + +void +acpi_ns_print_node_pathname(struct acpi_namespace_node *node, + const char *message) +{ + struct acpi_buffer buffer; + acpi_status status; + + if (!node) { + acpi_os_printf("[NULL NAME]"); + return; + } + + /* Convert handle to full pathname and print it (with supplied message) */ + + buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; + + status = acpi_ns_handle_to_pathname(node, &buffer, TRUE); + if (ACPI_SUCCESS(status)) { + if (message) { + acpi_os_printf("%s ", message); + } + + acpi_os_printf("%s", (char *)buffer.pointer); + ACPI_FREE(buffer.pointer); + } +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_type + * + * PARAMETERS: node - Parent Node to be examined + * + * RETURN: Type field from Node whose handle is passed + * + * DESCRIPTION: Return the type of a Namespace node + * + ******************************************************************************/ + +acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node) +{ + ACPI_FUNCTION_TRACE(ns_get_type); + + if (!node) { + ACPI_WARNING((AE_INFO, "Null Node parameter")); + return_UINT8(ACPI_TYPE_ANY); + } + + return_UINT8(node->type); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_local + * + * PARAMETERS: type - A namespace object type + * + * RETURN: LOCAL if names must be found locally in objects of the + * passed type, 0 if enclosing scopes should be searched + * + * DESCRIPTION: Returns scope rule for the given object type. + * + ******************************************************************************/ + +u32 acpi_ns_local(acpi_object_type type) +{ + ACPI_FUNCTION_TRACE(ns_local); + + if (!acpi_ut_valid_object_type(type)) { + + /* Type code out of range */ + + ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type)); + return_UINT32(ACPI_NS_NORMAL); + } + + return_UINT32(acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_internal_name_length + * + * PARAMETERS: info - Info struct initialized with the + * external name pointer. + * + * RETURN: None + * + * DESCRIPTION: Calculate the length of the internal (AML) namestring + * corresponding to the external (ASL) namestring. + * + ******************************************************************************/ + +void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info) +{ + const char *next_external_char; + u32 i; + + ACPI_FUNCTION_ENTRY(); + + next_external_char = info->external_name; + info->num_carats = 0; + info->num_segments = 0; + info->fully_qualified = FALSE; + + /* + * For the internal name, the required length is 4 bytes per segment, + * plus 1 each for root_prefix, multi_name_prefix_op, segment count, + * trailing null (which is not really needed, but no there's harm in + * putting it there) + * + * strlen() + 1 covers the first name_seg, which has no path separator + */ + if (ACPI_IS_ROOT_PREFIX(*next_external_char)) { + info->fully_qualified = TRUE; + next_external_char++; + + /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */ + + while (ACPI_IS_ROOT_PREFIX(*next_external_char)) { + next_external_char++; + } + } else { + /* Handle Carat prefixes */ + + while (ACPI_IS_PARENT_PREFIX(*next_external_char)) { + info->num_carats++; + next_external_char++; + } + } + + /* + * Determine the number of ACPI name "segments" by counting the number of + * path separators within the string. Start with one segment since the + * segment count is [(# separators) + 1], and zero separators is ok. + */ + if (*next_external_char) { + info->num_segments = 1; + for (i = 0; next_external_char[i]; i++) { + if (ACPI_IS_PATH_SEPARATOR(next_external_char[i])) { + info->num_segments++; + } + } + } + + info->length = (ACPI_NAMESEG_SIZE * info->num_segments) + + 4 + info->num_carats; + + info->next_external_char = next_external_char; +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_build_internal_name + * + * PARAMETERS: info - Info struct fully initialized + * + * RETURN: Status + * + * DESCRIPTION: Construct the internal (AML) namestring + * corresponding to the external (ASL) namestring. + * + ******************************************************************************/ + +acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info) +{ + u32 num_segments = info->num_segments; + char *internal_name = info->internal_name; + const char *external_name = info->next_external_char; + char *result = NULL; + u32 i; + + ACPI_FUNCTION_TRACE(ns_build_internal_name); + + /* Setup the correct prefixes, counts, and pointers */ + + if (info->fully_qualified) { + internal_name[0] = AML_ROOT_PREFIX; + + if (num_segments <= 1) { + result = &internal_name[1]; + } else if (num_segments == 2) { + internal_name[1] = AML_DUAL_NAME_PREFIX; + result = &internal_name[2]; + } else { + internal_name[1] = AML_MULTI_NAME_PREFIX; + internal_name[2] = (char)num_segments; + result = &internal_name[3]; + } + } else { + /* + * Not fully qualified. + * Handle Carats first, then append the name segments + */ + i = 0; + if (info->num_carats) { + for (i = 0; i < info->num_carats; i++) { + internal_name[i] = AML_PARENT_PREFIX; + } + } + + if (num_segments <= 1) { + result = &internal_name[i]; + } else if (num_segments == 2) { + internal_name[i] = AML_DUAL_NAME_PREFIX; + result = &internal_name[(acpi_size)i + 1]; + } else { + internal_name[i] = AML_MULTI_NAME_PREFIX; + internal_name[(acpi_size)i + 1] = (char)num_segments; + result = &internal_name[(acpi_size)i + 2]; + } + } + + /* Build the name (minus path separators) */ + + for (; num_segments; num_segments--) { + for (i = 0; i < ACPI_NAMESEG_SIZE; i++) { + if (ACPI_IS_PATH_SEPARATOR(*external_name) || + (*external_name == 0)) { + + /* Pad the segment with underscore(s) if segment is short */ + + result[i] = '_'; + } else { + /* Convert the character to uppercase and save it */ + + result[i] = (char)toupper((int)*external_name); + external_name++; + } + } + + /* Now we must have a path separator, or the pathname is bad */ + + if (!ACPI_IS_PATH_SEPARATOR(*external_name) && + (*external_name != 0)) { + return_ACPI_STATUS(AE_BAD_PATHNAME); + } + + /* Move on the next segment */ + + external_name++; + result += ACPI_NAMESEG_SIZE; + } + + /* Terminate the string */ + + *result = 0; + + if (info->fully_qualified) { + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "Returning [%p] (abs) \"\\%s\"\n", + internal_name, internal_name)); + } else { + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n", + internal_name, internal_name)); + } + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_internalize_name + * + * PARAMETERS: *external_name - External representation of name + * **Converted name - Where to return the resulting + * internal represention of the name + * + * RETURN: Status + * + * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0") + * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) + * + *******************************************************************************/ + +acpi_status +acpi_ns_internalize_name(const char *external_name, char **converted_name) +{ + char *internal_name; + struct acpi_namestring_info info; + acpi_status status; + + ACPI_FUNCTION_TRACE(ns_internalize_name); + + if ((!external_name) || (*external_name == 0) || (!converted_name)) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Get the length of the new internal name */ + + info.external_name = external_name; + acpi_ns_get_internal_name_length(&info); + + /* We need a segment to store the internal name */ + + internal_name = ACPI_ALLOCATE_ZEROED(info.length); + if (!internal_name) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Build the name */ + + info.internal_name = internal_name; + status = acpi_ns_build_internal_name(&info); + if (ACPI_FAILURE(status)) { + ACPI_FREE(internal_name); + return_ACPI_STATUS(status); + } + + *converted_name = internal_name; + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_externalize_name + * + * PARAMETERS: internal_name_length - Length of the internal name below + * internal_name - Internal representation of name + * converted_name_length - Where the length is returned + * converted_name - Where the resulting external name + * is returned + * + * RETURN: Status + * + * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) + * to its external (printable) form (e.g. "\_PR_.CPU0") + * + ******************************************************************************/ + +acpi_status +acpi_ns_externalize_name(u32 internal_name_length, + const char *internal_name, + u32 * converted_name_length, char **converted_name) +{ + u32 names_index = 0; + u32 num_segments = 0; + u32 required_length; + u32 prefix_length = 0; + u32 i = 0; + u32 j = 0; + + ACPI_FUNCTION_TRACE(ns_externalize_name); + + if (!internal_name_length || !internal_name || !converted_name) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Check for a prefix (one '\' | one or more '^') */ + + switch (internal_name[0]) { + case AML_ROOT_PREFIX: + + prefix_length = 1; + break; + + case AML_PARENT_PREFIX: + + for (i = 0; i < internal_name_length; i++) { + if (ACPI_IS_PARENT_PREFIX(internal_name[i])) { + prefix_length = i + 1; + } else { + break; + } + } + + if (i == internal_name_length) { + prefix_length = i; + } + + break; + + default: + + break; + } + + /* + * Check for object names. Note that there could be 0-255 of these + * 4-byte elements. + */ + if (prefix_length < internal_name_length) { + switch (internal_name[prefix_length]) { + case AML_MULTI_NAME_PREFIX: + + /* <count> 4-byte names */ + + names_index = prefix_length + 2; + num_segments = (u8) + internal_name[(acpi_size)prefix_length + 1]; + break; + + case AML_DUAL_NAME_PREFIX: + + /* Two 4-byte names */ + + names_index = prefix_length + 1; + num_segments = 2; + break; + + case 0: + + /* null_name */ + + names_index = 0; + num_segments = 0; + break; + + default: + + /* one 4-byte name */ + + names_index = prefix_length; + num_segments = 1; + break; + } + } + + /* + * Calculate the length of converted_name, which equals the length + * of the prefix, length of all object names, length of any required + * punctuation ('.') between object names, plus the NULL terminator. + */ + required_length = prefix_length + (4 * num_segments) + + ((num_segments > 0) ? (num_segments - 1) : 0) + 1; + + /* + * Check to see if we're still in bounds. If not, there's a problem + * with internal_name (invalid format). + */ + if (required_length > internal_name_length) { + ACPI_ERROR((AE_INFO, "Invalid internal name")); + return_ACPI_STATUS(AE_BAD_PATHNAME); + } + + /* Build the converted_name */ + + *converted_name = ACPI_ALLOCATE_ZEROED(required_length); + if (!(*converted_name)) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + j = 0; + + for (i = 0; i < prefix_length; i++) { + (*converted_name)[j++] = internal_name[i]; + } + + if (num_segments > 0) { + for (i = 0; i < num_segments; i++) { + if (i > 0) { + (*converted_name)[j++] = '.'; + } + + /* Copy and validate the 4-char name segment */ + + ACPI_COPY_NAMESEG(&(*converted_name)[j], + &internal_name[names_index]); + acpi_ut_repair_name(&(*converted_name)[j]); + + j += ACPI_NAMESEG_SIZE; + names_index += ACPI_NAMESEG_SIZE; + } + } + + if (converted_name_length) { + *converted_name_length = (u32) required_length; + } + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_validate_handle + * + * PARAMETERS: handle - Handle to be validated and typecast to a + * namespace node. + * + * RETURN: A pointer to a namespace node + * + * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special + * cases for the root node. + * + * NOTE: Real integer handles would allow for more verification + * and keep all pointers within this subsystem - however this introduces + * more overhead and has not been necessary to this point. Drivers + * holding handles are typically notified before a node becomes invalid + * due to a table unload. + * + ******************************************************************************/ + +struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle) +{ + + ACPI_FUNCTION_ENTRY(); + + /* Parameter validation */ + + if ((!handle) || (handle == ACPI_ROOT_OBJECT)) { + return (acpi_gbl_root_node); + } + + /* We can at least attempt to verify the handle */ + + if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) { + return (NULL); + } + + return (ACPI_CAST_PTR(struct acpi_namespace_node, handle)); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_terminate + * + * PARAMETERS: none + * + * RETURN: none + * + * DESCRIPTION: free memory allocated for namespace and ACPI table storage. + * + ******************************************************************************/ + +void acpi_ns_terminate(void) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE(ns_terminate); + + /* + * Free the entire namespace -- all nodes and all objects + * attached to the nodes + */ + acpi_ns_delete_namespace_subtree(acpi_gbl_root_node); + + /* Delete any objects attached to the root node */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE(status)) { + return_VOID; + } + + acpi_ns_delete_node(acpi_gbl_root_node); + (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n")); + return_VOID; +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_opens_scope + * + * PARAMETERS: type - A valid namespace type + * + * RETURN: NEWSCOPE if the passed type "opens a name scope" according + * to the ACPI specification, else 0 + * + ******************************************************************************/ + +u32 acpi_ns_opens_scope(acpi_object_type type) +{ + ACPI_FUNCTION_ENTRY(); + + if (type > ACPI_TYPE_LOCAL_MAX) { + + /* type code out of range */ + + ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type)); + return (ACPI_NS_NORMAL); + } + + return (((u32)acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_node_unlocked + * + * PARAMETERS: *pathname - Name to be found, in external (ASL) format. The + * \ (backslash) and ^ (carat) prefixes, and the + * . (period) to separate segments are supported. + * prefix_node - Root of subtree to be searched, or NS_ALL for the + * root of the name space. If Name is fully + * qualified (first s8 is '\'), the passed value + * of Scope will not be accessed. + * flags - Used to indicate whether to perform upsearch or + * not. + * return_node - Where the Node is returned + * + * DESCRIPTION: Look up a name relative to a given scope and return the + * corresponding Node. NOTE: Scope can be null. + * + * MUTEX: Doesn't locks namespace + * + ******************************************************************************/ + +acpi_status +acpi_ns_get_node_unlocked(struct acpi_namespace_node *prefix_node, + const char *pathname, + u32 flags, struct acpi_namespace_node **return_node) +{ + union acpi_generic_state scope_info; + acpi_status status; + char *internal_path; + + ACPI_FUNCTION_TRACE_PTR(ns_get_node_unlocked, + ACPI_CAST_PTR(char, pathname)); + + /* Simplest case is a null pathname */ + + if (!pathname) { + *return_node = prefix_node; + if (!prefix_node) { + *return_node = acpi_gbl_root_node; + } + + return_ACPI_STATUS(AE_OK); + } + + /* Quick check for a reference to the root */ + + if (ACPI_IS_ROOT_PREFIX(pathname[0]) && (!pathname[1])) { + *return_node = acpi_gbl_root_node; + return_ACPI_STATUS(AE_OK); + } + + /* Convert path to internal representation */ + + status = acpi_ns_internalize_name(pathname, &internal_path); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Setup lookup scope (search starting point) */ + + scope_info.scope.node = prefix_node; + + /* Lookup the name in the namespace */ + + status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY, + ACPI_IMODE_EXECUTE, + (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL, + return_node); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n", + pathname, acpi_format_exception(status))); + } + + ACPI_FREE(internal_path); + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ns_get_node + * + * PARAMETERS: *pathname - Name to be found, in external (ASL) format. The + * \ (backslash) and ^ (carat) prefixes, and the + * . (period) to separate segments are supported. + * prefix_node - Root of subtree to be searched, or NS_ALL for the + * root of the name space. If Name is fully + * qualified (first s8 is '\'), the passed value + * of Scope will not be accessed. + * flags - Used to indicate whether to perform upsearch or + * not. + * return_node - Where the Node is returned + * + * DESCRIPTION: Look up a name relative to a given scope and return the + * corresponding Node. NOTE: Scope can be null. + * + * MUTEX: Locks namespace + * + ******************************************************************************/ + +acpi_status +acpi_ns_get_node(struct acpi_namespace_node *prefix_node, + const char *pathname, + u32 flags, struct acpi_namespace_node **return_node) +{ + acpi_status status; + + ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname)); + + status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + status = acpi_ns_get_node_unlocked(prefix_node, pathname, + flags, return_node); + + (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); + return_ACPI_STATUS(status); +} |